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Merge tag 'platform-drivers-x86-v6.9-3' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-block.git] / fs / ext4 / super.c
CommitLineData
f5166768 1// SPDX-License-Identifier: GPL-2.0
ac27a0ec 2/*
617ba13b 3 * linux/fs/ext4/super.c
ac27a0ec
DK		 4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
c5ca7c76 24#include <linux/vmalloc.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
66114cad 28#include <linux/backing-dev.h>
ac27a0ec 29#include <linux/parser.h>
ac27a0ec 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ef510424 41#include <linux/dax.h>
7c0f6ba6 42#include <linux/uaccess.h>
ee73f9a5 43#include <linux/iversion.h>
c83ad55e 44#include <linux/unicode.h>
c6a564ff 45#include <linux/part_stat.h>
bfff6873
LC		 46#include <linux/kthread.h>
47#include <linux/freezer.h>
9a089b21 48#include <linux/fsnotify.h>
e5a185c2
LC		 49#include <linux/fs_context.h>
50#include <linux/fs_parser.h>
bfff6873 51
3dcf5451 52#include "ext4.h"
4a092d73 53#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 54#include "ext4_jbd2.h"
ac27a0ec
DK		 55#include "xattr.h"
56#include "acl.h"
3661d286 57#include "mballoc.h"
0c9ec4be 58#include "fsmap.h"
ac27a0ec 59
9bffad1e
TT		 60#define CREATE_TRACE_POINTS
61#include <trace/events/ext4.h>
62
0b75a840 63static struct ext4_lazy_init *ext4_li_info;
59ebc7fd 64static DEFINE_MUTEX(ext4_li_mtx);
e294a537 65static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 66
617ba13b 67static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 68 unsigned long journal_devnum);
2adf6da8 69static int ext4_show_options(struct seq_file *seq, struct dentry *root);
2d01ddc8 70static void ext4_update_super(struct super_block *sb);
4392fbc4 71static int ext4_commit_super(struct super_block *sb);
11215630 72static int ext4_mark_recovery_complete(struct super_block *sb,
2b2d6d01 73 struct ext4_super_block *es);
11215630
JK		 74static int ext4_clear_journal_err(struct super_block *sb,
75 struct ext4_super_block *es);
617ba13b 76static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 77static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 78static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 79static int ext4_freeze(struct super_block *sb);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
c6cb7e77
EW		 85static struct inode *ext4_get_journal_inode(struct super_block *sb,
86 unsigned int journal_inum);
da812f61 87static int ext4_validate_options(struct fs_context *fc);
b6bd2435
LC		 88static int ext4_check_opt_consistency(struct fs_context *fc,
89 struct super_block *sb);
85456054 90static void ext4_apply_options(struct fs_context *fc, struct super_block *sb);
02f960f8 91static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param);
cebe85d5
LC		 92static int ext4_get_tree(struct fs_context *fc);
93static int ext4_reconfigure(struct fs_context *fc);
94static void ext4_fc_free(struct fs_context *fc);
95static int ext4_init_fs_context(struct fs_context *fc);
1489dffd 96static void ext4_kill_sb(struct super_block *sb);
cebe85d5 97static const struct fs_parameter_spec ext4_param_specs[];
ac27a0ec 98
e74031fd
JK		 99/*
100 * Lock ordering
101 *
e74031fd 102 * page fault path:
d4f5258e
JK		 103 * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start
104 * -> page lock -> i_data_sem (rw)
e74031fd
JK		 105 *
106 * buffered write path:
c1e8d7c6 107 * sb_start_write -> i_mutex -> mmap_lock
e74031fd
JK		 108 * sb_start_write -> i_mutex -> transaction start -> page lock ->
109 * i_data_sem (rw)
110 *
111 * truncate:
d4f5258e
JK		 112 * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) ->
113 * page lock
114 * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start ->
1d39834f 115 * i_data_sem (rw)
e74031fd
JK		 116 *
117 * direct IO:
c1e8d7c6 118 * sb_start_write -> i_mutex -> mmap_lock
1d39834f 119 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
e74031fd
JK		 120 *
121 * writepages:
122 * transaction start -> page lock(s) -> i_data_sem (rw)
123 */
124
02f960f8
LC		 125static const struct fs_context_operations ext4_context_ops = {
126 .parse_param = ext4_parse_param,
cebe85d5
LC		 127 .get_tree = ext4_get_tree,
128 .reconfigure = ext4_reconfigure,
129 .free = ext4_fc_free,
02f960f8
LC		 130};
131
132
c290ea01 133#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776 134static struct file_system_type ext2_fs_type = {
cebe85d5
LC		 135 .owner = THIS_MODULE,
136 .name = "ext2",
137 .init_fs_context = ext4_init_fs_context,
138 .parameters = ext4_param_specs,
1489dffd 139 .kill_sb = ext4_kill_sb,
cebe85d5 140 .fs_flags = FS_REQUIRES_DEV,
2035e776 141};
7f78e035 142MODULE_ALIAS_FS("ext2");
fa7614dd 143MODULE_ALIAS("ext2");
4b41828b 144#define IS_EXT2_SB(sb) ((sb)->s_type == &ext2_fs_type)
2035e776
TT		 145#else
146#define IS_EXT2_SB(sb) (0)
147#endif
148
149
ba69f9ab 150static struct file_system_type ext3_fs_type = {
cebe85d5
LC		 151 .owner = THIS_MODULE,
152 .name = "ext3",
153 .init_fs_context = ext4_init_fs_context,
154 .parameters = ext4_param_specs,
1489dffd 155 .kill_sb = ext4_kill_sb,
cebe85d5 156 .fs_flags = FS_REQUIRES_DEV,
ba69f9ab 157};
7f78e035 158MODULE_ALIAS_FS("ext3");
fa7614dd 159MODULE_ALIAS("ext3");
4b41828b 160#define IS_EXT3_SB(sb) ((sb)->s_type == &ext3_fs_type)
bd81d8ee 161
fa491b14 162
67c0f556 163static inline void __ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
fa491b14 164 bh_end_io_t *end_io)
165{
166 /*
167 * buffer's verified bit is no longer valid after reading from
168 * disk again due to write out error, clear it to make sure we
169 * recheck the buffer contents.
170 */
171 clear_buffer_verified(bh);
172
173 bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
174 get_bh(bh);
1420c4a5 175 submit_bh(REQ_OP_READ | op_flags, bh);
fa491b14 176}
177
67c0f556 178void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
fa491b14 179 bh_end_io_t *end_io)
180{
181 BUG_ON(!buffer_locked(bh));
182
183 if (ext4_buffer_uptodate(bh)) {
184 unlock_buffer(bh);
185 return;
186 }
187 __ext4_read_bh(bh, op_flags, end_io);
188}
189
67c0f556 190int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, bh_end_io_t *end_io)
fa491b14 191{
192 BUG_ON(!buffer_locked(bh));
193
194 if (ext4_buffer_uptodate(bh)) {
195 unlock_buffer(bh);
196 return 0;
197 }
198
199 __ext4_read_bh(bh, op_flags, end_io);
200
201 wait_on_buffer(bh);
202 if (buffer_uptodate(bh))
203 return 0;
204 return -EIO;
205}
206
67c0f556 207int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait)
fa491b14 208{
0b73284c
ZY		 209 lock_buffer(bh);
210 if (!wait) {
fa491b14 211 ext4_read_bh_nowait(bh, op_flags, NULL);
212 return 0;
213 }
0b73284c 214 return ext4_read_bh(bh, op_flags, NULL);
fa491b14 215}
216
fb265c9c 217/*
8394a6ab 218 * This works like __bread_gfp() except it uses ERR_PTR for error
fb265c9c
TT		 219 * returns. Currently with sb_bread it's impossible to distinguish
220 * between ENOMEM and EIO situations (since both result in a NULL
221 * return.
222 */
8394a6ab 223static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
67c0f556
BVA		 224 sector_t block,
225 blk_opf_t op_flags, gfp_t gfp)
fb265c9c 226{
2d069c08 227 struct buffer_head *bh;
228 int ret;
fb265c9c 229
8394a6ab 230 bh = sb_getblk_gfp(sb, block, gfp);
fb265c9c
TT		 231 if (bh == NULL)
232 return ERR_PTR(-ENOMEM);
cf2834a5 233 if (ext4_buffer_uptodate(bh))
fb265c9c 234 return bh;
2d069c08 235
236 ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
237 if (ret) {
238 put_bh(bh);
239 return ERR_PTR(ret);
240 }
241 return bh;
fb265c9c
TT		 242}
243
8394a6ab 244struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
67c0f556 245 blk_opf_t op_flags)
8394a6ab 246{
8a83ac54
MWO		 247 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
248 ~__GFP_FS) | __GFP_MOVABLE;
249
250 return __ext4_sb_bread_gfp(sb, block, op_flags, gfp);
8394a6ab 251}
252
253struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
254 sector_t block)
255{
8a83ac54
MWO		 256 gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
257 ~__GFP_FS);
258
259 return __ext4_sb_bread_gfp(sb, block, 0, gfp);
8394a6ab 260}
261
5df1d412 262void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
263{
e509ad4d 264 struct buffer_head *bh = bdev_getblk(sb->s_bdev, block,
1cbf0a58 265 sb->s_blocksize, GFP_NOWAIT | __GFP_NOWARN);
5df1d412 266
267 if (likely(bh)) {
0b73284c
ZY		 268 if (trylock_buffer(bh))
269 ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL);
5df1d412 270 brelse(bh);
271 }
fb265c9c
TT		 272}
273
d25425f8
DW		 274static int ext4_verify_csum_type(struct super_block *sb,
275 struct ext4_super_block *es)
276{
e2b911c5 277 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 278 return 1;
279
280 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
281}
282
bbc605cd
LC		 283__le32 ext4_superblock_csum(struct super_block *sb,
284 struct ext4_super_block *es)
a9c47317
DW		 285{
286 struct ext4_sb_info *sbi = EXT4_SB(sb);
287 int offset = offsetof(struct ext4_super_block, s_checksum);
288 __u32 csum;
289
290 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
291
292 return cpu_to_le32(csum);
293}
294
c197855e
SH		 295static int ext4_superblock_csum_verify(struct super_block *sb,
296 struct ext4_super_block *es)
a9c47317 297{
9aa5d32b 298 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 299 return 1;
300
301 return es->s_checksum == ext4_superblock_csum(sb, es);
302}
303
06db49e6 304void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 305{
06db49e6
TT		 306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
307
9aa5d32b 308 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 309 return;
310
311 es->s_checksum = ext4_superblock_csum(sb, es);
312}
313
8fadc143
AR		 314ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
315 struct ext4_group_desc *bg)
bd81d8ee 316{
3a14589c 317 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 318 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 319 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 320}
321
8fadc143
AR		 322ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
323 struct ext4_group_desc *bg)
bd81d8ee 324{
5272f837 325 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 326 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 327 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 328}
329
8fadc143
AR		 330ext4_fsblk_t ext4_inode_table(struct super_block *sb,
331 struct ext4_group_desc *bg)
bd81d8ee 332{
5272f837 333 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 334 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 335 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 336}
337
021b65bb
TT		 338__u32 ext4_free_group_clusters(struct super_block *sb,
339 struct ext4_group_desc *bg)
560671a0
AK		 340{
341 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
342 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 343 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 344}
345
346__u32 ext4_free_inodes_count(struct super_block *sb,
347 struct ext4_group_desc *bg)
348{
349 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
350 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 351 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 352}
353
354__u32 ext4_used_dirs_count(struct super_block *sb,
355 struct ext4_group_desc *bg)
356{
357 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
358 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 359 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 360}
361
362__u32 ext4_itable_unused_count(struct super_block *sb,
363 struct ext4_group_desc *bg)
364{
365 return le16_to_cpu(bg->bg_itable_unused_lo) |
366 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 367 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 368}
369
8fadc143
AR		 370void ext4_block_bitmap_set(struct super_block *sb,
371 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 372{
3a14589c 373 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 374 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
375 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 376}
377
8fadc143
AR		 378void ext4_inode_bitmap_set(struct super_block *sb,
379 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 380{
5272f837 381 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 382 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
383 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 384}
385
8fadc143
AR		 386void ext4_inode_table_set(struct super_block *sb,
387 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 388{
5272f837 389 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 390 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
391 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 392}
393
021b65bb
TT		 394void ext4_free_group_clusters_set(struct super_block *sb,
395 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 396{
397 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
398 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
399 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
400}
401
402void ext4_free_inodes_set(struct super_block *sb,
403 struct ext4_group_desc *bg, __u32 count)
404{
405 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
406 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
407 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
408}
409
410void ext4_used_dirs_set(struct super_block *sb,
411 struct ext4_group_desc *bg, __u32 count)
412{
413 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
414 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
415 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
416}
417
418void ext4_itable_unused_set(struct super_block *sb,
419 struct ext4_group_desc *bg, __u32 count)
420{
421 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
422 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
423 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
424}
425
c92dc856 426static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)
6a0678a7 427{
6a0678a7
AB		 428 now = clamp_val(now, 0, (1ull << 40) - 1);
429
430 *lo = cpu_to_le32(lower_32_bits(now));
431 *hi = upper_32_bits(now);
432}
433
434static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
435{
436 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
437}
438#define ext4_update_tstamp(es, tstamp) \
c92dc856
JK		 439 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
440 ktime_get_real_seconds())
6a0678a7
AB		 441#define ext4_get_tstamp(es, tstamp) \
442 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
d3d1faf6 443
ff0722de
VK		 444#define EXT4_SB_REFRESH_INTERVAL_SEC (3600) /* seconds (1 hour) */
445#define EXT4_SB_REFRESH_INTERVAL_KB (16384) /* kilobytes (16MB) */
446
447/*
448 * The ext4_maybe_update_superblock() function checks and updates the
449 * superblock if needed.
450 *
451 * This function is designed to update the on-disk superblock only under
452 * certain conditions to prevent excessive disk writes and unnecessary
453 * waking of the disk from sleep. The superblock will be updated if:
454 * 1. More than an hour has passed since the last superblock update, and
455 * 2. More than 16MB have been written since the last superblock update.
456 *
457 * @sb: The superblock
458 */
459static void ext4_maybe_update_superblock(struct super_block *sb)
460{
461 struct ext4_sb_info *sbi = EXT4_SB(sb);
462 struct ext4_super_block *es = sbi->s_es;
463 journal_t *journal = sbi->s_journal;
464 time64_t now;
465 __u64 last_update;
466 __u64 lifetime_write_kbytes;
467 __u64 diff_size;
468
469 if (sb_rdonly(sb) || !(sb->s_flags & SB_ACTIVE) ||
470 !journal || (journal->j_flags & JBD2_UNMOUNT))
471 return;
472
473 now = ktime_get_real_seconds();
474 last_update = ext4_get_tstamp(es, s_wtime);
475
476 if (likely(now - last_update < EXT4_SB_REFRESH_INTERVAL_SEC))
477 return;
478
479 lifetime_write_kbytes = sbi->s_kbytes_written +
480 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
481 sbi->s_sectors_written_start) >> 1);
482
483 /* Get the number of kilobytes not written to disk to account
484 * for statistics and compare with a multiple of 16 MB. This
485 * is used to determine when the next superblock commit should
486 * occur (i.e. not more often than once per 16MB if there was
487 * less written in an hour).
488 */
489 diff_size = lifetime_write_kbytes - le64_to_cpu(es->s_kbytes_written);
490
491 if (diff_size > EXT4_SB_REFRESH_INTERVAL_KB)
bb15cea2 492 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);
ff0722de
VK		 493}
494
bdfe0cbd
TT		 495/*
496 * The del_gendisk() function uninitializes the disk-specific data
497 * structures, including the bdi structure, without telling anyone
498 * else. Once this happens, any attempt to call mark_buffer_dirty()
499 * (for example, by ext4_commit_super), will cause a kernel OOPS.
500 * This is a kludge to prevent these oops until we can put in a proper
501 * hook in del_gendisk() to inform the VFS and file system layers.
502 */
503static int block_device_ejected(struct super_block *sb)
504{
505 struct inode *bd_inode = sb->s_bdev->bd_inode;
506 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
507
508 return bdi->dev == NULL;
509}
510
18aadd47
BJ		 511static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
512{
513 struct super_block *sb = journal->j_private;
514 struct ext4_sb_info *sbi = EXT4_SB(sb);
515 int error = is_journal_aborted(journal);
5d3ee208 516 struct ext4_journal_cb_entry *jce;
18aadd47 517
5d3ee208 518 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 519
520 ext4_process_freed_data(sb, txn->t_tid);
ff0722de 521 ext4_maybe_update_superblock(sb);
a0154344 522
18aadd47 523 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 524 while (!list_empty(&txn->t_private_list)) {
525 jce = list_entry(txn->t_private_list.next,
526 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 527 list_del_init(&jce->jce_list);
528 spin_unlock(&sbi->s_md_lock);
529 jce->jce_func(sb, jce, error);
530 spin_lock(&sbi->s_md_lock);
531 }
532 spin_unlock(&sbi->s_md_lock);
533}
1c13d5c0 534
afb585a9
MFO		 535/*
536 * This writepage callback for write_cache_pages()
537 * takes care of a few cases after page cleaning.
538 *
539 * write_cache_pages() already checks for dirty pages
540 * and calls clear_page_dirty_for_io(), which we want,
541 * to write protect the pages.
542 *
543 * However, we may have to redirty a page (see below.)
544 */
d585bdbe 545static int ext4_journalled_writepage_callback(struct folio *folio,
afb585a9
MFO		 546 struct writeback_control *wbc,
547 void *data)
548{
549 transaction_t *transaction = (transaction_t *) data;
550 struct buffer_head *bh, *head;
551 struct journal_head *jh;
552
d585bdbe 553 bh = head = folio_buffers(folio);
afb585a9
MFO		 554 do {
555 /*
556 * We have to redirty a page in these cases:
557 * 1) If buffer is dirty, it means the page was dirty because it
558 * contains a buffer that needs checkpointing. So the dirty bit
559 * needs to be preserved so that checkpointing writes the buffer
560 * properly.
561 * 2) If buffer is not part of the committing transaction
562 * (we may have just accidentally come across this buffer because
563 * inode range tracking is not exact) or if the currently running
564 * transaction already contains this buffer as well, dirty bit
565 * needs to be preserved so that the buffer gets writeprotected
566 * properly on running transaction's commit.
567 */
568 jh = bh2jh(bh);
569 if (buffer_dirty(bh) ||
570 (jh && (jh->b_transaction != transaction ||
571 jh->b_next_transaction))) {
d585bdbe 572 folio_redirty_for_writepage(wbc, folio);
afb585a9
MFO		 573 goto out;
574 }
575 } while ((bh = bh->b_this_page) != head);
576
577out:
578 return AOP_WRITEPAGE_ACTIVATE;
579}
580
581static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
582{
583 struct address_space *mapping = jinode->i_vfs_inode->i_mapping;
584 struct writeback_control wbc = {
585 .sync_mode = WB_SYNC_ALL,
586 .nr_to_write = LONG_MAX,
587 .range_start = jinode->i_dirty_start,
588 .range_end = jinode->i_dirty_end,
589 };
590
591 return write_cache_pages(mapping, &wbc,
592 ext4_journalled_writepage_callback,
593 jinode->i_transaction);
594}
595
596static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
597{
598 int ret;
599
600 if (ext4_should_journal_data(jinode->i_vfs_inode))
601 ret = ext4_journalled_submit_inode_data_buffers(jinode);
602 else
59205c8d 603 ret = ext4_normal_submit_inode_data_buffers(jinode);
afb585a9
MFO		 604 return ret;
605}
606
607static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
608{
609 int ret = 0;
610
611 if (!ext4_should_journal_data(jinode->i_vfs_inode))
612 ret = jbd2_journal_finish_inode_data_buffers(jinode);
613
614 return ret;
615}
616
1dc1097f
JK		 617static bool system_going_down(void)
618{
619 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
620 || system_state == SYSTEM_RESTART;
621}
622
02a7780e
JK		 623struct ext4_err_translation {
624 int code;
625 int errno;
626};
627
628#define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
629
630static struct ext4_err_translation err_translation[] = {
631 EXT4_ERR_TRANSLATE(EIO),
632 EXT4_ERR_TRANSLATE(ENOMEM),
633 EXT4_ERR_TRANSLATE(EFSBADCRC),
634 EXT4_ERR_TRANSLATE(EFSCORRUPTED),
635 EXT4_ERR_TRANSLATE(ENOSPC),
636 EXT4_ERR_TRANSLATE(ENOKEY),
637 EXT4_ERR_TRANSLATE(EROFS),
638 EXT4_ERR_TRANSLATE(EFBIG),
639 EXT4_ERR_TRANSLATE(EEXIST),
640 EXT4_ERR_TRANSLATE(ERANGE),
641 EXT4_ERR_TRANSLATE(EOVERFLOW),
642 EXT4_ERR_TRANSLATE(EBUSY),
643 EXT4_ERR_TRANSLATE(ENOTDIR),
644 EXT4_ERR_TRANSLATE(ENOTEMPTY),
645 EXT4_ERR_TRANSLATE(ESHUTDOWN),
646 EXT4_ERR_TRANSLATE(EFAULT),
647};
648
649static int ext4_errno_to_code(int errno)
650{
651 int i;
652
653 for (i = 0; i < ARRAY_SIZE(err_translation); i++)
654 if (err_translation[i].errno == errno)
655 return err_translation[i].code;
656 return EXT4_ERR_UNKNOWN;
657}
658
2d01ddc8
JK		 659static void save_error_info(struct super_block *sb, int error,
660 __u32 ino, __u64 block,
661 const char *func, unsigned int line)
40676623 662{
c92dc856 663 struct ext4_sb_info *sbi = EXT4_SB(sb);
40676623 664
02a7780e
JK		 665 /* We default to EFSCORRUPTED error... */
666 if (error == 0)
667 error = EFSCORRUPTED;
c92dc856
JK		 668
669 spin_lock(&sbi->s_error_lock);
670 sbi->s_add_error_count++;
671 sbi->s_last_error_code = error;
672 sbi->s_last_error_line = line;
673 sbi->s_last_error_ino = ino;
674 sbi->s_last_error_block = block;
675 sbi->s_last_error_func = func;
676 sbi->s_last_error_time = ktime_get_real_seconds();
677 if (!sbi->s_first_error_time) {
678 sbi->s_first_error_code = error;
679 sbi->s_first_error_line = line;
680 sbi->s_first_error_ino = ino;
681 sbi->s_first_error_block = block;
682 sbi->s_first_error_func = func;
683 sbi->s_first_error_time = sbi->s_last_error_time;
684 }
685 spin_unlock(&sbi->s_error_lock);
40676623
JK		 686}
687
ac27a0ec
DK		 688/* Deal with the reporting of failure conditions on a filesystem such as
689 * inconsistencies detected or read IO failures.
690 *
691 * On ext2, we can store the error state of the filesystem in the
617ba13b 692 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 693 * write ordering constraints on the superblock which prevent us from
694 * writing it out straight away; and given that the journal is about to
695 * be aborted, we can't rely on the current, or future, transactions to
696 * write out the superblock safely.
697 *
dab291af 698 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 699 * the journal instead. On recovery, the journal will complain about
ac27a0ec 700 * that error until we've noted it down and cleared it.
014c9caa
JK		 701 *
702 * If force_ro is set, we unconditionally force the filesystem into an
703 * ABORT|READONLY state, unless the error response on the fs has been set to
704 * panic in which case we take the easy way out and panic immediately. This is
705 * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
706 * at a critical moment in log management.
ac27a0ec 707 */
e789ca0c
JK		 708static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
709 __u32 ino, __u64 block,
710 const char *func, unsigned int line)
ac27a0ec 711{
b08070ec 712 journal_t *journal = EXT4_SB(sb)->s_journal;
2d01ddc8 713 bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);
b08070ec 714
e789ca0c 715 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
327eaf73
TT		 716 if (test_opt(sb, WARN_ON_ERROR))
717 WARN_ON_ONCE(1);
718
2d01ddc8 719 if (!continue_fs && !sb_rdonly(sb)) {
95257987 720 set_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
2d01ddc8
JK		 721 if (journal)
722 jbd2_journal_abort(journal, -EIO);
723 }
724
725 if (!bdev_read_only(sb->s_bdev)) {
e789ca0c 726 save_error_info(sb, error, ino, block, func, line);
2d01ddc8
JK		 727 /*
728 * In case the fs should keep running, we need to writeout
729 * superblock through the journal. Due to lock ordering
730 * constraints, it may not be safe to do it right here so we
731 * defer superblock flushing to a workqueue.
732 */
bb9464e0 733 if (continue_fs && journal)
bb15cea2 734 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);
2d01ddc8
JK		 735 else
736 ext4_commit_super(sb);
737 }
e789ca0c 738
1dc1097f
JK		 739 /*
740 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
741 * could panic during 'reboot -f' as the underlying device got already
742 * disabled.
743 */
014c9caa 744 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
617ba13b 745 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 746 sb->s_id);
4327ba52 747 }
ac2f7ca5
YB		 748
749 if (sb_rdonly(sb) || continue_fs)
750 return;
751
014c9caa
JK		 752 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
753 /*
754 * Make sure updated value of ->s_mount_flags will be visible before
755 * ->s_flags update
756 */
757 smp_wmb();
758 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 759}
760
bb15cea2 761static void update_super_work(struct work_struct *work)
c92dc856
JK		 762{
763 struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,
bb15cea2 764 s_sb_upd_work);
2d01ddc8
JK		 765 journal_t *journal = sbi->s_journal;
766 handle_t *handle;
c92dc856 767
2d01ddc8
JK		 768 /*
769 * If the journal is still running, we have to write out superblock
770 * through the journal to avoid collisions of other journalled sb
771 * updates.
772 *
773 * We use directly jbd2 functions here to avoid recursing back into
774 * ext4 error handling code during handling of previous errors.
775 */
776 if (!sb_rdonly(sbi->s_sb) && journal) {
558d6450 777 struct buffer_head *sbh = sbi->s_sbh;
ee6a12d0
TT		 778 bool call_notify_err = false;
779
2d01ddc8
JK		 780 handle = jbd2_journal_start(journal, 1);
781 if (IS_ERR(handle))
782 goto write_directly;
558d6450 783 if (jbd2_journal_get_write_access(handle, sbh)) {
2d01ddc8
JK		 784 jbd2_journal_stop(handle);
785 goto write_directly;
786 }
ff0722de
VK		 787
788 if (sbi->s_add_error_count > 0)
789 call_notify_err = true;
790
2d01ddc8 791 ext4_update_super(sbi->s_sb);
558d6450
YB		 792 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
793 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
794 "superblock detected");
795 clear_buffer_write_io_error(sbh);
796 set_buffer_uptodate(sbh);
797 }
798
799 if (jbd2_journal_dirty_metadata(handle, sbh)) {
2d01ddc8
JK		 800 jbd2_journal_stop(handle);
801 goto write_directly;
802 }
803 jbd2_journal_stop(handle);
ff0722de
VK		 804
805 if (call_notify_err)
806 ext4_notify_error_sysfs(sbi);
807
2d01ddc8
JK		 808 return;
809 }
810write_directly:
811 /*
812 * Write through journal failed. Write sb directly to get error info
813 * out and hope for the best.
814 */
4392fbc4 815 ext4_commit_super(sbi->s_sb);
d578b994 816 ext4_notify_error_sysfs(sbi);
ac27a0ec
DK		 817}
818
efbed4dc
TT		 819#define ext4_error_ratelimit(sb) \
820 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
821 "EXT4-fs error")
822
12062ddd 823void __ext4_error(struct super_block *sb, const char *function,
014c9caa 824 unsigned int line, bool force_ro, int error, __u64 block,
54d3adbc 825 const char *fmt, ...)
ac27a0ec 826{
0ff2ea7d 827 struct va_format vaf;
ac27a0ec
DK		 828 va_list args;
829
eb8ab444 830 if (unlikely(ext4_forced_shutdown(sb)))
0db1ff22
TT		 831 return;
832
ccf0f32a 833 trace_ext4_error(sb, function, line);
efbed4dc
TT		 834 if (ext4_error_ratelimit(sb)) {
835 va_start(args, fmt);
836 vaf.fmt = fmt;
837 vaf.va = &args;
838 printk(KERN_CRIT
839 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
840 sb->s_id, function, line, current->comm, &vaf);
841 va_end(args);
842 }
9a089b21
GKB		 843 fsnotify_sb_error(sb, NULL, error ? error : EFSCORRUPTED);
844
e789ca0c 845 ext4_handle_error(sb, force_ro, error, 0, block, function, line);
ac27a0ec
DK		 846}
847
e7c96e8e 848void __ext4_error_inode(struct inode *inode, const char *function,
54d3adbc 849 unsigned int line, ext4_fsblk_t block, int error,
e7c96e8e 850 const char *fmt, ...)
273df556
FM		 851{
852 va_list args;
f7c21177 853 struct va_format vaf;
273df556 854
eb8ab444 855 if (unlikely(ext4_forced_shutdown(inode->i_sb)))
0db1ff22
TT		 856 return;
857
ccf0f32a 858 trace_ext4_error(inode->i_sb, function, line);
efbed4dc
TT		 859 if (ext4_error_ratelimit(inode->i_sb)) {
860 va_start(args, fmt);
861 vaf.fmt = fmt;
862 vaf.va = &args;
863 if (block)
864 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
865 "inode #%lu: block %llu: comm %s: %pV\n",
866 inode->i_sb->s_id, function, line, inode->i_ino,
867 block, current->comm, &vaf);
868 else
869 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
870 "inode #%lu: comm %s: %pV\n",
871 inode->i_sb->s_id, function, line, inode->i_ino,
872 current->comm, &vaf);
873 va_end(args);
874 }
9a089b21
GKB		 875 fsnotify_sb_error(inode->i_sb, inode, error ? error : EFSCORRUPTED);
876
e789ca0c
JK		 877 ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,
878 function, line);
273df556
FM		 879}
880
e7c96e8e
JP		 881void __ext4_error_file(struct file *file, const char *function,
882 unsigned int line, ext4_fsblk_t block,
883 const char *fmt, ...)
273df556
FM		 884{
885 va_list args;
f7c21177 886 struct va_format vaf;
496ad9aa 887 struct inode *inode = file_inode(file);
273df556
FM		 888 char pathname[80], *path;
889
eb8ab444 890 if (unlikely(ext4_forced_shutdown(inode->i_sb)))
0db1ff22
TT		 891 return;
892
ccf0f32a 893 trace_ext4_error(inode->i_sb, function, line);
efbed4dc 894 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 895 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 896 if (IS_ERR(path))
897 path = "(unknown)";
898 va_start(args, fmt);
899 vaf.fmt = fmt;
900 vaf.va = &args;
901 if (block)
902 printk(KERN_CRIT
903 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
904 "block %llu: comm %s: path %s: %pV\n",
905 inode->i_sb->s_id, function, line, inode->i_ino,
906 block, current->comm, path, &vaf);
907 else
908 printk(KERN_CRIT
909 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
910 "comm %s: path %s: %pV\n",
911 inode->i_sb->s_id, function, line, inode->i_ino,
912 current->comm, path, &vaf);
913 va_end(args);
914 }
9a089b21
GKB		 915 fsnotify_sb_error(inode->i_sb, inode, EFSCORRUPTED);
916
e789ca0c
JK		 917 ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,
918 function, line);
273df556
FM		 919}
920
722887dd
TT		 921const char *ext4_decode_error(struct super_block *sb, int errno,
922 char nbuf[16])
ac27a0ec
DK		 923{
924 char *errstr = NULL;
925
926 switch (errno) {
6a797d27
DW		 927 case -EFSCORRUPTED:
928 errstr = "Corrupt filesystem";
929 break;
930 case -EFSBADCRC:
931 errstr = "Filesystem failed CRC";
932 break;
ac27a0ec
DK		 933 case -EIO:
934 errstr = "IO failure";
935 break;
936 case -ENOMEM:
937 errstr = "Out of memory";
938 break;
939 case -EROFS:
78f1ddbb
TT		 940 if (!sb || (EXT4_SB(sb)->s_journal &&
941 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 942 errstr = "Journal has aborted";
943 else
944 errstr = "Readonly filesystem";
945 break;
946 default:
947 /* If the caller passed in an extra buffer for unknown
948 * errors, textualise them now. Else we just return
949 * NULL. */
950 if (nbuf) {
951 /* Check for truncated error codes... */
952 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
953 errstr = nbuf;
954 }
955 break;
956 }
957
958 return errstr;
959}
960
617ba13b 961/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 962 * automatically and invokes the appropriate error response. */
963
c398eda0
TT		 964void __ext4_std_error(struct super_block *sb, const char *function,
965 unsigned int line, int errno)
ac27a0ec
DK		 966{
967 char nbuf[16];
968 const char *errstr;
969
eb8ab444 970 if (unlikely(ext4_forced_shutdown(sb)))
0db1ff22
TT		 971 return;
972
ac27a0ec
DK		 973 /* Special case: if the error is EROFS, and we're not already
974 * inside a transaction, then there's really no point in logging
975 * an error. */
bc98a42c 976 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 977 return;
978
efbed4dc
TT		 979 if (ext4_error_ratelimit(sb)) {
980 errstr = ext4_decode_error(sb, errno, nbuf);
981 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
982 sb->s_id, function, line, errstr);
983 }
9a089b21 984 fsnotify_sb_error(sb, NULL, errno ? errno : EFSCORRUPTED);
ac27a0ec 985
e789ca0c 986 ext4_handle_error(sb, false, -errno, 0, 0, function, line);
ac27a0ec
DK		 987}
988
e7c96e8e
JP		 989void __ext4_msg(struct super_block *sb,
990 const char *prefix, const char *fmt, ...)
b31e1552 991{
0ff2ea7d 992 struct va_format vaf;
b31e1552
ES		 993 va_list args;
994
da812f61
LC		 995 if (sb) {
996 atomic_inc(&EXT4_SB(sb)->s_msg_count);
997 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state),
998 "EXT4-fs"))
999 return;
1000 }
efbed4dc 1001
b31e1552 1002 va_start(args, fmt);
0ff2ea7d
JP		 1003 vaf.fmt = fmt;
1004 vaf.va = &args;
da812f61
LC		 1005 if (sb)
1006 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
1007 else
1008 printk("%sEXT4-fs: %pV\n", prefix, &vaf);
b31e1552
ES		 1009 va_end(args);
1010}
1011
1cf006ed
DM		 1012static int ext4_warning_ratelimit(struct super_block *sb)
1013{
1014 atomic_inc(&EXT4_SB(sb)->s_warning_count);
1015 return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
1016 "EXT4-fs warning");
1017}
b03a2f7e 1018
12062ddd 1019void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 1020 unsigned int line, const char *fmt, ...)
ac27a0ec 1021{
0ff2ea7d 1022 struct va_format vaf;
ac27a0ec
DK		 1023 va_list args;
1024
b03a2f7e 1025 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 1026 return;
1027
ac27a0ec 1028 va_start(args, fmt);
0ff2ea7d
JP		 1029 vaf.fmt = fmt;
1030 vaf.va = &args;
1031 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
1032 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 1033 va_end(args);
1034}
1035
b03a2f7e
AD		 1036void __ext4_warning_inode(const struct inode *inode, const char *function,
1037 unsigned int line, const char *fmt, ...)
1038{
1039 struct va_format vaf;
1040 va_list args;
1041
1042 if (!ext4_warning_ratelimit(inode->i_sb))
1043 return;
1044
1045 va_start(args, fmt);
1046 vaf.fmt = fmt;
1047 vaf.va = &args;
1048 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
1049 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
1050 function, line, inode->i_ino, current->comm, &vaf);
1051 va_end(args);
1052}
1053
e29136f8
TT		 1054void __ext4_grp_locked_error(const char *function, unsigned int line,
1055 struct super_block *sb, ext4_group_t grp,
1056 unsigned long ino, ext4_fsblk_t block,
1057 const char *fmt, ...)
5d1b1b3f
AK		 1058__releases(bitlock)
1059__acquires(bitlock)
1060{
0ff2ea7d 1061 struct va_format vaf;
5d1b1b3f 1062 va_list args;
5d1b1b3f 1063
eb8ab444 1064 if (unlikely(ext4_forced_shutdown(sb)))
0db1ff22
TT		 1065 return;
1066
ccf0f32a 1067 trace_ext4_error(sb, function, line);
efbed4dc
TT		 1068 if (ext4_error_ratelimit(sb)) {
1069 va_start(args, fmt);
1070 vaf.fmt = fmt;
1071 vaf.va = &args;
1072 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
1073 sb->s_id, function, line, grp);
1074 if (ino)
1075 printk(KERN_CONT "inode %lu: ", ino);
1076 if (block)
1077 printk(KERN_CONT "block %llu:",
1078 (unsigned long long) block);
1079 printk(KERN_CONT "%pV\n", &vaf);
1080 va_end(args);
1081 }
5d1b1b3f
AK		 1082
1083 if (test_opt(sb, ERRORS_CONT)) {
c92dc856
JK		 1084 if (test_opt(sb, WARN_ON_ERROR))
1085 WARN_ON_ONCE(1);
e789ca0c 1086 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2d01ddc8
JK		 1087 if (!bdev_read_only(sb->s_bdev)) {
1088 save_error_info(sb, EFSCORRUPTED, ino, block, function,
1089 line);
bb15cea2 1090 schedule_work(&EXT4_SB(sb)->s_sb_upd_work);
2d01ddc8 1091 }
5d1b1b3f
AK		 1092 return;
1093 }
1094 ext4_unlock_group(sb, grp);
e789ca0c 1095 ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);
5d1b1b3f
AK		 1096 /*
1097 * We only get here in the ERRORS_RO case; relocking the group
1098 * may be dangerous, but nothing bad will happen since the
1099 * filesystem will have already been marked read/only and the
1100 * journal has been aborted. We return 1 as a hint to callers
1101 * who might what to use the return value from
25985edc 1102 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 1103 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1104 * aggressively from the ext4 function in question, with a
1105 * more appropriate error code.
1106 */
1107 ext4_lock_group(sb, grp);
1108 return;
1109}
1110
db79e6d1
WS		 1111void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
1112 ext4_group_t group,
1113 unsigned int flags)
1114{
1115 struct ext4_sb_info *sbi = EXT4_SB(sb);
1116 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1117 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
9af0b3d1
WS		 1118 int ret;
1119
5354b2af
TT		 1120 if (!grp || !gdp)
1121 return;
9af0b3d1
WS		 1122 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
1123 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
1124 &grp->bb_state);
1125 if (!ret)
1126 percpu_counter_sub(&sbi->s_freeclusters_counter,
1127 grp->bb_free);
db79e6d1
WS		 1128 }
1129
9af0b3d1
WS		 1130 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
1131 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
1132 &grp->bb_state);
1133 if (!ret && gdp) {
db79e6d1
WS		 1134 int count;
1135
1136 count = ext4_free_inodes_count(sb, gdp);
1137 percpu_counter_sub(&sbi->s_freeinodes_counter,
1138 count);
1139 }
db79e6d1
WS		 1140 }
1141}
1142
617ba13b 1143void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 1144{
617ba13b 1145 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 1146
617ba13b 1147 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 1148 return;
1149
12062ddd 1150 ext4_warning(sb,
ac27a0ec
DK		 1151 "updating to rev %d because of new feature flag, "
1152 "running e2fsck is recommended",
617ba13b 1153 EXT4_DYNAMIC_REV);
ac27a0ec 1154
617ba13b
MC		 1155 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
1156 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
1157 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 1158 /* leave es->s_feature_*compat flags alone */
1159 /* es->s_uuid will be set by e2fsck if empty */
1160
1161 /*
1162 * The rest of the superblock fields should be zero, and if not it
1163 * means they are likely already in use, so leave them alone. We
1164 * can leave it up to e2fsck to clean up any inconsistencies there.
1165 */
1166}
1167
ac27a0ec
DK		 1168static inline struct inode *orphan_list_entry(struct list_head *l)
1169{
617ba13b 1170 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 1171}
1172
617ba13b 1173static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 1174{
1175 struct list_head *l;
1176
b31e1552
ES		 1177 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
1178 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 1179
1180 printk(KERN_ERR "sb_info orphan list:\n");
1181 list_for_each(l, &sbi->s_orphan) {
1182 struct inode *inode = orphan_list_entry(l);
1183 printk(KERN_ERR " "
1184 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1185 inode->i_sb->s_id, inode->i_ino, inode,
1186 inode->i_mode, inode->i_nlink,
1187 NEXT_ORPHAN(inode));
1188 }
1189}
1190
957153fc
JK		 1191#ifdef CONFIG_QUOTA
1192static int ext4_quota_off(struct super_block *sb, int type);
1193
f3c1c42e 1194static inline void ext4_quotas_off(struct super_block *sb, int type)
957153fc 1195{
f3c1c42e 1196 BUG_ON(type > EXT4_MAXQUOTAS);
957153fc 1197
964edf66 1198 /* Use our quota_off function to clear inode flags etc. */
f3c1c42e 1199 for (type--; type >= 0; type--)
964edf66 1200 ext4_quota_off(sb, type);
957153fc 1201}
33458eab
TT		 1202
1203/*
1204 * This is a helper function which is used in the mount/remount
1205 * codepaths (which holds s_umount) to fetch the quota file name.
1206 */
1207static inline char *get_qf_name(struct super_block *sb,
1208 struct ext4_sb_info *sbi,
1209 int type)
1210{
1211 return rcu_dereference_protected(sbi->s_qf_names[type],
1212 lockdep_is_held(&sb->s_umount));
1213}
957153fc 1214#else
f3c1c42e 1215static inline void ext4_quotas_off(struct super_block *sb, int type)
957153fc
JK		 1216{
1217}
1218#endif
1219
1f79467c
JY		 1220static int ext4_percpu_param_init(struct ext4_sb_info *sbi)
1221{
1222 ext4_fsblk_t block;
1223 int err;
1224
1225 block = ext4_count_free_clusters(sbi->s_sb);
1226 ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block));
1227 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
1228 GFP_KERNEL);
1229 if (!err) {
1230 unsigned long freei = ext4_count_free_inodes(sbi->s_sb);
1231 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
1232 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
1233 GFP_KERNEL);
1234 }
1235 if (!err)
1236 err = percpu_counter_init(&sbi->s_dirs_counter,
1237 ext4_count_dirs(sbi->s_sb), GFP_KERNEL);
1238 if (!err)
1239 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
1240 GFP_KERNEL);
1241 if (!err)
1242 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
1243 GFP_KERNEL);
1244 if (!err)
1245 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
1246
1247 if (err)
1248 ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory");
1249
1250 return err;
1251}
1252
1253static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi)
1254{
1255 percpu_counter_destroy(&sbi->s_freeclusters_counter);
1256 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1257 percpu_counter_destroy(&sbi->s_dirs_counter);
1258 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1259 percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
1260 percpu_free_rwsem(&sbi->s_writepages_rwsem);
1261}
1262
6ef68498
JY		 1263static void ext4_group_desc_free(struct ext4_sb_info *sbi)
1264{
1265 struct buffer_head **group_desc;
1266 int i;
1267
1268 rcu_read_lock();
1269 group_desc = rcu_dereference(sbi->s_group_desc);
1270 for (i = 0; i < sbi->s_gdb_count; i++)
1271 brelse(group_desc[i]);
1272 kvfree(group_desc);
1273 rcu_read_unlock();
1274}
1275
dcbf8758
JY		 1276static void ext4_flex_groups_free(struct ext4_sb_info *sbi)
1277{
1278 struct flex_groups **flex_groups;
1279 int i;
1280
1281 rcu_read_lock();
1282 flex_groups = rcu_dereference(sbi->s_flex_groups);
1283 if (flex_groups) {
1284 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1285 kvfree(flex_groups[i]);
1286 kvfree(flex_groups);
1287 }
1288 rcu_read_unlock();
1289}
1290
2b2d6d01 1291static void ext4_put_super(struct super_block *sb)
ac27a0ec 1292{
617ba13b
MC		 1293 struct ext4_sb_info *sbi = EXT4_SB(sb);
1294 struct ext4_super_block *es = sbi->s_es;
97abd7d4 1295 int aborted = 0;
856dd6c5 1296 int err;
ac27a0ec 1297
5e47868f
RH		 1298 /*
1299 * Unregister sysfs before destroying jbd2 journal.
1300 * Since we could still access attr_journal_task attribute via sysfs
1301 * path which could have sbi->s_journal->j_task as NULL
bb15cea2 1302 * Unregister sysfs before flush sbi->s_sb_upd_work.
b98535d0
YB		 1303 * Since user may read /proc/fs/ext4/xx/mb_groups during umount, If
1304 * read metadata verify failed then will queue error work.
bb15cea2 1305 * update_super_work will call start_this_handle may trigger
b98535d0 1306 * BUG_ON.
5e47868f
RH		 1307 */
1308 ext4_unregister_sysfs(sb);
1309
4808cb5b 1310 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount"))
bb0fbc78
LC		 1311 ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.",
1312 &sb->s_uuid);
4808cb5b 1313
b98535d0 1314 ext4_unregister_li_request(sb);
f3c1c42e 1315 ext4_quotas_off(sb, EXT4_MAXQUOTAS);
b98535d0 1316
bb15cea2 1317 flush_work(&sbi->s_sb_upd_work);
b98535d0
YB		 1318 destroy_workqueue(sbi->rsv_conversion_wq);
1319 ext4_release_orphan_info(sb);
1320
0390131b 1321 if (sbi->s_journal) {
97abd7d4 1322 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 1323 err = jbd2_journal_destroy(sbi->s_journal);
1324 sbi->s_journal = NULL;
878520ac 1325 if ((err < 0) && !aborted) {
54d3adbc 1326 ext4_abort(sb, -err, "Couldn't clean up the journal");
878520ac 1327 }
0390131b 1328 }
d4edac31 1329
d3922a77 1330 ext4_es_unregister_shrinker(sbi);
292a089d 1331 timer_shutdown_sync(&sbi->s_err_report);
d4edac31
JB		 1332 ext4_release_system_zone(sb);
1333 ext4_mb_release(sb);
1334 ext4_ext_release(sb);
d4edac31 1335
bc98a42c 1336 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 1337 ext4_clear_feature_journal_needs_recovery(sb);
02f310fc 1338 ext4_clear_feature_orphan_present(sb);
ac27a0ec 1339 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 1340 }
bc98a42c 1341 if (!sb_rdonly(sb))
4392fbc4 1342 ext4_commit_super(sb);
a8e25a83 1343
6ef68498 1344 ext4_group_desc_free(sbi);
dcbf8758 1345 ext4_flex_groups_free(sbi);
1f79467c 1346 ext4_percpu_param_destroy(sbi);
ac27a0ec 1347#ifdef CONFIG_QUOTA
856dd6c5 1348 for (int i = 0; i < EXT4_MAXQUOTAS; i++)
33458eab 1349 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 1350#endif
1351
1352 /* Debugging code just in case the in-memory inode orphan list
1353 * isn't empty. The on-disk one can be non-empty if we've
1354 * detected an error and taken the fs readonly, but the
1355 * in-memory list had better be clean by this point. */
1356 if (!list_empty(&sbi->s_orphan))
1357 dump_orphan_list(sb, sbi);
837c23fb 1358 ASSERT(list_empty(&sbi->s_orphan));
ac27a0ec 1359
89d96a6f 1360 sync_blockdev(sb->s_bdev);
f98393a6 1361 invalidate_bdev(sb->s_bdev);
61ead714 1362 if (sbi->s_journal_bdev_file) {
1489dffd
CH		 1363 /*
1364 * Invalidate the journal device's buffers. We don't want them
1365 * floating about in memory - the physical journal device may
1366 * hotswapped, and it breaks the `ro-after' testing code.
1367 */
61ead714
CB		 1368 sync_blockdev(file_bdev(sbi->s_journal_bdev_file));
1369 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file));
ac27a0ec 1370 }
50c15df6
CX		 1371
1372 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1373 sbi->s_ea_inode_cache = NULL;
1374
1375 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1376 sbi->s_ea_block_cache = NULL;
1377
618f0031
PS		 1378 ext4_stop_mmpd(sbi);
1379
9060dd2c 1380 brelse(sbi->s_sbh);
ac27a0ec 1381 sb->s_fs_info = NULL;
3197ebdb
TT		 1382 /*
1383 * Now that we are completely done shutting down the
1384 * superblock, we need to actually destroy the kobject.
1385 */
3197ebdb
TT		 1386 kobject_put(&sbi->s_kobj);
1387 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1388 if (sbi->s_chksum_driver)
1389 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1390 kfree(sbi->s_blockgroup_lock);
8012b866 1391 fs_put_dax(sbi->s_daxdev, NULL);
ac4acb1f 1392 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
5298d4bf 1393#if IS_ENABLED(CONFIG_UNICODE)
f8f4acb6 1394 utf8_unload(sb->s_encoding);
c83ad55e 1395#endif
ac27a0ec 1396 kfree(sbi);
ac27a0ec
DK		 1397}
1398
e18b890b 1399static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1400
1401/*
1402 * Called inside transaction, so use GFP_NOFS
1403 */
617ba13b 1404static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1405{
617ba13b 1406 struct ext4_inode_info *ei;
ac27a0ec 1407
fd60b288 1408 ei = alloc_inode_sb(sb, ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1409 if (!ei)
1410 return NULL;
0b8e58a1 1411
ee73f9a5 1412 inode_set_iversion(&ei->vfs_inode, 1);
7ea71af9 1413 ei->i_flags = 0;
202ee5df 1414 spin_lock_init(&ei->i_raw_lock);
38727786 1415 ei->i_prealloc_node = RB_ROOT;
27bc446e 1416 atomic_set(&ei->i_prealloc_active, 0);
38727786 1417 rwlock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1418 ext4_es_init_tree(&ei->i_es_tree);
1419 rwlock_init(&ei->i_es_lock);
edaa53ca 1420 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1421 ei->i_es_all_nr = 0;
edaa53ca 1422 ei->i_es_shk_nr = 0;
dd475925 1423 ei->i_es_shrink_lblk = 0;
d2a17637 1424 ei->i_reserved_data_blocks = 0;
d2a17637 1425 spin_lock_init(&(ei->i_block_reservation_lock));
1dc0aa46 1426 ext4_init_pending_tree(&ei->i_pending_tree);
a9e7f447
DM		 1427#ifdef CONFIG_QUOTA
1428 ei->i_reserved_quota = 0;
96c7e0d9 1429 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1430#endif
8aefcd55 1431 ei->jinode = NULL;
2e8fa54e 1432 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1433 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1434 ei->i_sync_tid = 0;
1435 ei->i_datasync_tid = 0;
e27f41e1 1436 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1437 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
aa75f4d3
HS		 1438 ext4_fc_init_inode(&ei->vfs_inode);
1439 mutex_init(&ei->i_fc_lock);
ac27a0ec
DK		 1440 return &ei->vfs_inode;
1441}
1442
7ff9c073
TT		 1443static int ext4_drop_inode(struct inode *inode)
1444{
1445 int drop = generic_drop_inode(inode);
1446
29b3692e
EB		 1447 if (!drop)
1448 drop = fscrypt_drop_inode(inode);
1449
7ff9c073
TT		 1450 trace_ext4_drop_inode(inode, drop);
1451 return drop;
1452}
1453
94053139 1454static void ext4_free_in_core_inode(struct inode *inode)
fa0d7e3d 1455{
2c58d548 1456 fscrypt_free_inode(inode);
aa75f4d3
HS		 1457 if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
1458 pr_warn("%s: inode %ld still in fc list",
1459 __func__, inode->i_ino);
1460 }
fa0d7e3d
NP		 1461 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1462}
1463
617ba13b 1464static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1465{
9f7dd93d 1466 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1467 ext4_msg(inode->i_sb, KERN_ERR,
1468 "Inode %lu (%p): orphan list check failed!",
1469 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1470 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1471 EXT4_I(inode), sizeof(struct ext4_inode_info),
1472 true);
1473 dump_stack();
1474 }
6fed8395
JX		 1475
1476 if (EXT4_I(inode)->i_reserved_data_blocks)
1477 ext4_msg(inode->i_sb, KERN_ERR,
1478 "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
1479 inode->i_ino, EXT4_I(inode),
1480 EXT4_I(inode)->i_reserved_data_blocks);
ac27a0ec
DK		 1481}
1482
f5db130d
CH		 1483static void ext4_shutdown(struct super_block *sb)
1484{
1485 ext4_force_shutdown(sb, EXT4_GOING_FLAGS_NOLOGFLUSH);
1486}
1487
51cc5068 1488static void init_once(void *foo)
ac27a0ec 1489{
c30365b9 1490 struct ext4_inode_info *ei = foo;
ac27a0ec 1491
a35afb83 1492 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1493 init_rwsem(&ei->xattr_sem);
0e855ac8 1494 init_rwsem(&ei->i_data_sem);
a35afb83 1495 inode_init_once(&ei->vfs_inode);
aa75f4d3 1496 ext4_fc_init_inode(&ei->vfs_inode);
ac27a0ec
DK		 1497}
1498
e67bc2b3 1499static int __init init_inodecache(void)
ac27a0ec 1500{
f8dd7c70
DW		 1501 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1502 sizeof(struct ext4_inode_info), 0,
f88c3fb8 1503 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
f8dd7c70
DW		 1504 offsetof(struct ext4_inode_info, i_data),
1505 sizeof_field(struct ext4_inode_info, i_data),
1506 init_once);
617ba13b 1507 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1508 return -ENOMEM;
1509 return 0;
1510}
1511
1512static void destroy_inodecache(void)
1513{
8c0a8537
KS		 1514 /*
1515 * Make sure all delayed rcu free inodes are flushed before we
1516 * destroy cache.
1517 */
1518 rcu_barrier();
617ba13b 1519 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1520}
1521
0930fcc1 1522void ext4_clear_inode(struct inode *inode)
ac27a0ec 1523{
aa75f4d3 1524 ext4_fc_del(inode);
0930fcc1 1525 invalidate_inode_buffers(inode);
dbd5768f 1526 clear_inode(inode);
2ffd2a6a 1527 ext4_discard_preallocations(inode);
51865fda 1528 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
f4c2d372 1529 dquot_drop(inode);
8aefcd55
TT		 1530 if (EXT4_I(inode)->jinode) {
1531 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1532 EXT4_I(inode)->jinode);
1533 jbd2_free_inode(EXT4_I(inode)->jinode);
1534 EXT4_I(inode)->jinode = NULL;
1535 }
3d204e24 1536 fscrypt_put_encryption_info(inode);
c93d8f88 1537 fsverity_cleanup_inode(inode);
ac27a0ec
DK		 1538}
1539
1b961ac0 1540static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1541 u64 ino, u32 generation)
ac27a0ec 1542{
ac27a0ec 1543 struct inode *inode;
ac27a0ec 1544
8a363970 1545 /*
ac27a0ec
DK		 1546 * Currently we don't know the generation for parent directory, so
1547 * a generation of 0 means "accept any"
1548 */
8a363970 1549 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1550 if (IS_ERR(inode))
1551 return ERR_CAST(inode);
1552 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1553 iput(inode);
1554 return ERR_PTR(-ESTALE);
1555 }
1b961ac0
CH		 1556
1557 return inode;
1558}
1559
1560static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1561 int fh_len, int fh_type)
1b961ac0
CH		 1562{
1563 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1564 ext4_nfs_get_inode);
1565}
1566
1567static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1568 int fh_len, int fh_type)
1b961ac0
CH		 1569{
1570 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1571 ext4_nfs_get_inode);
ac27a0ec
DK		 1572}
1573
fde87268
TT		 1574static int ext4_nfs_commit_metadata(struct inode *inode)
1575{
1576 struct writeback_control wbc = {
1577 .sync_mode = WB_SYNC_ALL
1578 };
1579
1580 trace_ext4_nfs_commit_metadata(inode);
1581 return ext4_write_inode(inode, &wbc);
1582}
1583
ac27a0ec 1584#ifdef CONFIG_QUOTA
d6006186 1585static const char * const quotatypes[] = INITQFNAMES;
689c958c 1586#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1587
617ba13b
MC		 1588static int ext4_write_dquot(struct dquot *dquot);
1589static int ext4_acquire_dquot(struct dquot *dquot);
1590static int ext4_release_dquot(struct dquot *dquot);
1591static int ext4_mark_dquot_dirty(struct dquot *dquot);
1592static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1593static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1594 const struct path *path);
617ba13b 1595static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1596 size_t len, loff_t off);
617ba13b 1597static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1598 const char *data, size_t len, loff_t off);
7c319d32
AK		 1599static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1600 unsigned int flags);
ac27a0ec 1601
ccb49011 1602static struct dquot __rcu **ext4_get_dquots(struct inode *inode)
96c7e0d9
JK		 1603{
1604 return EXT4_I(inode)->i_dquot;
1605}
1606
61e225dc 1607static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1608 .get_reserved_space = ext4_get_reserved_space,
1609 .write_dquot = ext4_write_dquot,
1610 .acquire_dquot = ext4_acquire_dquot,
1611 .release_dquot = ext4_release_dquot,
1612 .mark_dirty = ext4_mark_dquot_dirty,
1613 .write_info = ext4_write_info,
1614 .alloc_dquot = dquot_alloc,
1615 .destroy_dquot = dquot_destroy,
1616 .get_projid = ext4_get_projid,
1617 .get_inode_usage = ext4_get_inode_usage,
ebc11f7b 1618 .get_next_id = dquot_get_next_id,
ac27a0ec
DK		 1619};
1620
0d54b217 1621static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1622 .quota_on = ext4_quota_on,
ca0e05e4 1623 .quota_off = ext4_quota_off,
287a8095 1624 .quota_sync = dquot_quota_sync,
0a240339 1625 .get_state = dquot_get_state,
287a8095
CH		 1626 .set_info = dquot_set_dqinfo,
1627 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1628 .set_dqblk = dquot_set_dqblk,
1629 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1630};
1631#endif
1632
ee9b6d61 1633static const struct super_operations ext4_sops = {
617ba13b 1634 .alloc_inode = ext4_alloc_inode,
94053139 1635 .free_inode = ext4_free_in_core_inode,
617ba13b 1636 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1637 .write_inode = ext4_write_inode,
1638 .dirty_inode = ext4_dirty_inode,
7ff9c073 1639 .drop_inode = ext4_drop_inode,
0930fcc1 1640 .evict_inode = ext4_evict_inode,
617ba13b 1641 .put_super = ext4_put_super,
617ba13b 1642 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1643 .freeze_fs = ext4_freeze,
1644 .unfreeze_fs = ext4_unfreeze,
617ba13b 1645 .statfs = ext4_statfs,
617ba13b 1646 .show_options = ext4_show_options,
f5db130d 1647 .shutdown = ext4_shutdown,
ac27a0ec 1648#ifdef CONFIG_QUOTA
617ba13b
MC		 1649 .quota_read = ext4_quota_read,
1650 .quota_write = ext4_quota_write,
96c7e0d9 1651 .get_dquots = ext4_get_dquots,
ac27a0ec
DK		 1652#endif
1653};
1654
39655164 1655static const struct export_operations ext4_export_ops = {
e21fc203 1656 .encode_fh = generic_encode_ino32_fh,
1b961ac0
CH		 1657 .fh_to_dentry = ext4_fh_to_dentry,
1658 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1659 .get_parent = ext4_get_parent,
fde87268 1660 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1661};
1662
1663enum {
1664 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
ba2e524d 1665 Opt_resgid, Opt_resuid, Opt_sb,
72578c33 1666 Opt_nouid32, Opt_debug, Opt_removed,
2d544ec9 1667 Opt_user_xattr, Opt_acl,
72578c33 1668 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1669 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1670 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1671 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1672 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
4f74d15f 1673 Opt_inlinecrypt,
ba2e524d 1674 Opt_usrjquota, Opt_grpjquota, Opt_quota,
ee4a3fcd 1675 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1ff20307 1676 Opt_usrquota, Opt_grpquota, Opt_prjquota,
9cb20f94 1677 Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
327eaf73 1678 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
4437992b 1679 Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize,
1449032b 1680 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1681 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1682 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1683 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1684 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
21175ca4 1685 Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
e5a185c2 1686 Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,
8016e29f 1687#ifdef CONFIG_EXT4_DEBUG
99c880de 1688 Opt_fc_debug_max_replay, Opt_fc_debug_force
8016e29f 1689#endif
ac27a0ec
DK		 1690};
1691
e5a185c2 1692static const struct constant_table ext4_param_errors[] = {
ba2e524d
LC		 1693 {"continue", EXT4_MOUNT_ERRORS_CONT},
1694 {"panic", EXT4_MOUNT_ERRORS_PANIC},
1695 {"remount-ro", EXT4_MOUNT_ERRORS_RO},
e5a185c2
LC		 1696 {}
1697};
1698
1699static const struct constant_table ext4_param_data[] = {
ba2e524d
LC		 1700 {"journal", EXT4_MOUNT_JOURNAL_DATA},
1701 {"ordered", EXT4_MOUNT_ORDERED_DATA},
1702 {"writeback", EXT4_MOUNT_WRITEBACK_DATA},
e5a185c2
LC		 1703 {}
1704};
1705
1706static const struct constant_table ext4_param_data_err[] = {
1707 {"abort", Opt_data_err_abort},
1708 {"ignore", Opt_data_err_ignore},
1709 {}
1710};
1711
1712static const struct constant_table ext4_param_jqfmt[] = {
ba2e524d
LC		 1713 {"vfsold", QFMT_VFS_OLD},
1714 {"vfsv0", QFMT_VFS_V0},
1715 {"vfsv1", QFMT_VFS_V1},
e5a185c2
LC		 1716 {}
1717};
1718
1719static const struct constant_table ext4_param_dax[] = {
1720 {"always", Opt_dax_always},
1721 {"inode", Opt_dax_inode},
1722 {"never", Opt_dax_never},
1723 {}
1724};
1725
1726/* String parameter that allows empty argument */
1727#define fsparam_string_empty(NAME, OPT) \
1728 __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
1729
1730/*
1731 * Mount option specification
1732 * We don't use fsparam_flag_no because of the way we set the
1733 * options and the way we show them in _ext4_show_options(). To
1734 * keep the changes to a minimum, let's keep the negative options
1735 * separate for now.
1736 */
1737static const struct fs_parameter_spec ext4_param_specs[] = {
1738 fsparam_flag ("bsddf", Opt_bsd_df),
1739 fsparam_flag ("minixdf", Opt_minix_df),
1740 fsparam_flag ("grpid", Opt_grpid),
1741 fsparam_flag ("bsdgroups", Opt_grpid),
1742 fsparam_flag ("nogrpid", Opt_nogrpid),
1743 fsparam_flag ("sysvgroups", Opt_nogrpid),
1744 fsparam_u32 ("resgid", Opt_resgid),
1745 fsparam_u32 ("resuid", Opt_resuid),
1746 fsparam_u32 ("sb", Opt_sb),
1747 fsparam_enum ("errors", Opt_errors, ext4_param_errors),
1748 fsparam_flag ("nouid32", Opt_nouid32),
1749 fsparam_flag ("debug", Opt_debug),
1750 fsparam_flag ("oldalloc", Opt_removed),
1751 fsparam_flag ("orlov", Opt_removed),
1752 fsparam_flag ("user_xattr", Opt_user_xattr),
e5a185c2 1753 fsparam_flag ("acl", Opt_acl),
e5a185c2
LC		 1754 fsparam_flag ("norecovery", Opt_noload),
1755 fsparam_flag ("noload", Opt_noload),
1756 fsparam_flag ("bh", Opt_removed),
1757 fsparam_flag ("nobh", Opt_removed),
1758 fsparam_u32 ("commit", Opt_commit),
1759 fsparam_u32 ("min_batch_time", Opt_min_batch_time),
1760 fsparam_u32 ("max_batch_time", Opt_max_batch_time),
1761 fsparam_u32 ("journal_dev", Opt_journal_dev),
1762 fsparam_bdev ("journal_path", Opt_journal_path),
1763 fsparam_flag ("journal_checksum", Opt_journal_checksum),
1764 fsparam_flag ("nojournal_checksum", Opt_nojournal_checksum),
1765 fsparam_flag ("journal_async_commit",Opt_journal_async_commit),
1766 fsparam_flag ("abort", Opt_abort),
1767 fsparam_enum ("data", Opt_data, ext4_param_data),
1768 fsparam_enum ("data_err", Opt_data_err,
1769 ext4_param_data_err),
1770 fsparam_string_empty
1771 ("usrjquota", Opt_usrjquota),
1772 fsparam_string_empty
1773 ("grpjquota", Opt_grpjquota),
1774 fsparam_enum ("jqfmt", Opt_jqfmt, ext4_param_jqfmt),
1775 fsparam_flag ("grpquota", Opt_grpquota),
1776 fsparam_flag ("quota", Opt_quota),
1777 fsparam_flag ("noquota", Opt_noquota),
1778 fsparam_flag ("usrquota", Opt_usrquota),
1779 fsparam_flag ("prjquota", Opt_prjquota),
1780 fsparam_flag ("barrier", Opt_barrier),
1781 fsparam_u32 ("barrier", Opt_barrier),
1782 fsparam_flag ("nobarrier", Opt_nobarrier),
1ff20307 1783 fsparam_flag ("i_version", Opt_removed),
e5a185c2
LC		 1784 fsparam_flag ("dax", Opt_dax),
1785 fsparam_enum ("dax", Opt_dax_type, ext4_param_dax),
1786 fsparam_u32 ("stripe", Opt_stripe),
1787 fsparam_flag ("delalloc", Opt_delalloc),
1788 fsparam_flag ("nodelalloc", Opt_nodelalloc),
1789 fsparam_flag ("warn_on_error", Opt_warn_on_error),
1790 fsparam_flag ("nowarn_on_error", Opt_nowarn_on_error),
e5a185c2
LC		 1791 fsparam_u32 ("debug_want_extra_isize",
1792 Opt_debug_want_extra_isize),
1793 fsparam_flag ("mblk_io_submit", Opt_removed),
1794 fsparam_flag ("nomblk_io_submit", Opt_removed),
1795 fsparam_flag ("block_validity", Opt_block_validity),
1796 fsparam_flag ("noblock_validity", Opt_noblock_validity),
1797 fsparam_u32 ("inode_readahead_blks",
1798 Opt_inode_readahead_blks),
1799 fsparam_u32 ("journal_ioprio", Opt_journal_ioprio),
1800 fsparam_u32 ("auto_da_alloc", Opt_auto_da_alloc),
1801 fsparam_flag ("auto_da_alloc", Opt_auto_da_alloc),
1802 fsparam_flag ("noauto_da_alloc", Opt_noauto_da_alloc),
1803 fsparam_flag ("dioread_nolock", Opt_dioread_nolock),
1804 fsparam_flag ("nodioread_nolock", Opt_dioread_lock),
1805 fsparam_flag ("dioread_lock", Opt_dioread_lock),
1806 fsparam_flag ("discard", Opt_discard),
1807 fsparam_flag ("nodiscard", Opt_nodiscard),
1808 fsparam_u32 ("init_itable", Opt_init_itable),
1809 fsparam_flag ("init_itable", Opt_init_itable),
1810 fsparam_flag ("noinit_itable", Opt_noinit_itable),
1811#ifdef CONFIG_EXT4_DEBUG
1812 fsparam_flag ("fc_debug_force", Opt_fc_debug_force),
1813 fsparam_u32 ("fc_debug_max_replay", Opt_fc_debug_max_replay),
1814#endif
1815 fsparam_u32 ("max_dir_size_kb", Opt_max_dir_size_kb),
1816 fsparam_flag ("test_dummy_encryption",
1817 Opt_test_dummy_encryption),
1818 fsparam_string ("test_dummy_encryption",
1819 Opt_test_dummy_encryption),
1820 fsparam_flag ("inlinecrypt", Opt_inlinecrypt),
1821 fsparam_flag ("nombcache", Opt_nombcache),
1822 fsparam_flag ("no_mbcache", Opt_nombcache), /* for backward compatibility */
1823 fsparam_flag ("prefetch_block_bitmaps",
1824 Opt_removed),
1825 fsparam_flag ("no_prefetch_block_bitmaps",
1826 Opt_no_prefetch_block_bitmaps),
1827 fsparam_s32 ("mb_optimize_scan", Opt_mb_optimize_scan),
1828 fsparam_string ("check", Opt_removed), /* mount option from ext2/3 */
1829 fsparam_flag ("nocheck", Opt_removed), /* mount option from ext2/3 */
1830 fsparam_flag ("reservation", Opt_removed), /* mount option from ext2/3 */
1831 fsparam_flag ("noreservation", Opt_removed), /* mount option from ext2/3 */
1832 fsparam_u32 ("journal", Opt_removed), /* mount option from ext2/3 */
1833 {}
1834};
1835
b3881f74 1836#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
196e402a 1837
26092bf5
TT		 1838#define MOPT_SET 0x0001
1839#define MOPT_CLEAR 0x0002
1840#define MOPT_NOSUPPORT 0x0004
1841#define MOPT_EXPLICIT 0x0008
ac27a0ec 1842#ifdef CONFIG_QUOTA
26092bf5 1843#define MOPT_Q 0
ba2e524d 1844#define MOPT_QFMT 0x0010
26092bf5
TT		 1845#else
1846#define MOPT_Q MOPT_NOSUPPORT
1847#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1848#endif
ba2e524d
LC		 1849#define MOPT_NO_EXT2 0x0020
1850#define MOPT_NO_EXT3 0x0040
8dc0aa8c 1851#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ba2e524d
LC		 1852#define MOPT_SKIP 0x0080
1853#define MOPT_2 0x0100
26092bf5
TT		 1854
1855static const struct mount_opts {
1856 int token;
1857 int mount_opt;
1858 int flags;
1859} ext4_mount_opts[] = {
1860 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1861 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1862 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1863 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1864 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1865 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1866 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1867 MOPT_EXT4_ONLY | MOPT_SET},
1868 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1869 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1870 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1871 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1872 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1873 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1874 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1875 MOPT_EXT4_ONLY | MOPT_CLEAR},
327eaf73
TT		 1876 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1877 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
cb8435dc 1878 {Opt_commit, 0, MOPT_NO_EXT2},
c6d3d56d
DW		 1879 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1880 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1881 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1882 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1883 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1884 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1885 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1886 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
ba2e524d 1887 {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2},
26092bf5
TT		 1888 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1889 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1890 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1891 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1892 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
ba2e524d
LC		 1893 {Opt_dax_type, 0, MOPT_EXT4_ONLY},
1894 {Opt_journal_dev, 0, MOPT_NO_EXT2},
1895 {Opt_journal_path, 0, MOPT_NO_EXT2},
1896 {Opt_journal_ioprio, 0, MOPT_NO_EXT2},
1897 {Opt_data, 0, MOPT_NO_EXT2},
26092bf5 1898 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
03010a33 1899#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5 1900 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
ac27a0ec 1901#else
26092bf5 1902 {Opt_acl, 0, MOPT_NOSUPPORT},
ac27a0ec 1903#endif
26092bf5
TT		 1904 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1905 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1906 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1907 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1908 MOPT_SET | MOPT_Q},
1909 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1910 MOPT_SET | MOPT_Q},
49da9392
JK		 1911 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1912 MOPT_SET | MOPT_Q},
26092bf5 1913 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1914 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1915 MOPT_CLEAR | MOPT_Q},
ba2e524d
LC		 1916 {Opt_usrjquota, 0, MOPT_Q},
1917 {Opt_grpjquota, 0, MOPT_Q},
1918 {Opt_jqfmt, 0, MOPT_QFMT},
cdb7ee4c 1919 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
21175ca4 1920 {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
3d392b26 1921 MOPT_SET},
99c880de 1922#ifdef CONFIG_EXT4_DEBUG
0f0672ff
HS		 1923 {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
1924 MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
8016e29f 1925#endif
22b8d707 1926 {Opt_abort, EXT4_MOUNT2_ABORT, MOPT_SET | MOPT_2},
26092bf5
TT		 1927 {Opt_err, 0, 0}
1928};
1929
5298d4bf 1930#if IS_ENABLED(CONFIG_UNICODE)
c83ad55e
GKB		 1931static const struct ext4_sb_encodings {
1932 __u16 magic;
1933 char *name;
49bd03cc 1934 unsigned int version;
c83ad55e 1935} ext4_sb_encoding_map[] = {
49bd03cc 1936 {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
c83ad55e
GKB		 1937};
1938
aa8bf298
CH		 1939static const struct ext4_sb_encodings *
1940ext4_sb_read_encoding(const struct ext4_super_block *es)
c83ad55e
GKB		 1941{
1942 __u16 magic = le16_to_cpu(es->s_encoding);
1943 int i;
1944
1945 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1946 if (magic == ext4_sb_encoding_map[i].magic)
aa8bf298 1947 return &ext4_sb_encoding_map[i];
c83ad55e 1948
aa8bf298 1949 return NULL;
c83ad55e
GKB		 1950}
1951#endif
1952
6e47a3cc
LC		 1953#define EXT4_SPEC_JQUOTA (1 << 0)
1954#define EXT4_SPEC_JQFMT (1 << 1)
1955#define EXT4_SPEC_DATAJ (1 << 2)
1956#define EXT4_SPEC_SB_BLOCK (1 << 3)
1957#define EXT4_SPEC_JOURNAL_DEV (1 << 4)
1958#define EXT4_SPEC_JOURNAL_IOPRIO (1 << 5)
6e47a3cc
LC		 1959#define EXT4_SPEC_s_want_extra_isize (1 << 7)
1960#define EXT4_SPEC_s_max_batch_time (1 << 8)
1961#define EXT4_SPEC_s_min_batch_time (1 << 9)
1962#define EXT4_SPEC_s_inode_readahead_blks (1 << 10)
1963#define EXT4_SPEC_s_li_wait_mult (1 << 11)
1964#define EXT4_SPEC_s_max_dir_size_kb (1 << 12)
1965#define EXT4_SPEC_s_stripe (1 << 13)
1966#define EXT4_SPEC_s_resuid (1 << 14)
1967#define EXT4_SPEC_s_resgid (1 << 15)
1968#define EXT4_SPEC_s_commit_interval (1 << 16)
1969#define EXT4_SPEC_s_fc_debug_max_replay (1 << 17)
7edfd85b 1970#define EXT4_SPEC_s_sb_block (1 << 18)
27b38686 1971#define EXT4_SPEC_mb_optimize_scan (1 << 19)
6e47a3cc 1972
461c3af0 1973struct ext4_fs_context {
e6e268cb 1974 char *s_qf_names[EXT4_MAXQUOTAS];
85456054 1975 struct fscrypt_dummy_policy dummy_enc_policy;
e6e268cb 1976 int s_jquota_fmt; /* Format of quota to use */
6e47a3cc
LC		 1977#ifdef CONFIG_EXT4_DEBUG
1978 int s_fc_debug_max_replay;
1979#endif
e6e268cb 1980 unsigned short qname_spec;
6e47a3cc
LC		 1981 unsigned long vals_s_flags; /* Bits to set in s_flags */
1982 unsigned long mask_s_flags; /* Bits changed in s_flags */
e6e268cb 1983 unsigned long journal_devnum;
6e47a3cc
LC		 1984 unsigned long s_commit_interval;
1985 unsigned long s_stripe;
1986 unsigned int s_inode_readahead_blks;
1987 unsigned int s_want_extra_isize;
1988 unsigned int s_li_wait_mult;
1989 unsigned int s_max_dir_size_kb;
e6e268cb 1990 unsigned int journal_ioprio;
6e47a3cc
LC		 1991 unsigned int vals_s_mount_opt;
1992 unsigned int mask_s_mount_opt;
1993 unsigned int vals_s_mount_opt2;
1994 unsigned int mask_s_mount_opt2;
b6bd2435 1995 unsigned int opt_flags; /* MOPT flags */
6e47a3cc
LC		 1996 unsigned int spec;
1997 u32 s_max_batch_time;
1998 u32 s_min_batch_time;
1999 kuid_t s_resuid;
2000 kgid_t s_resgid;
7edfd85b 2001 ext4_fsblk_t s_sb_block;
b237e304
HS		 2002};
2003
cebe85d5
LC		 2004static void ext4_fc_free(struct fs_context *fc)
2005{
2006 struct ext4_fs_context *ctx = fc->fs_private;
2007 int i;
2008
2009 if (!ctx)
2010 return;
2011
2012 for (i = 0; i < EXT4_MAXQUOTAS; i++)
2013 kfree(ctx->s_qf_names[i]);
2014
85456054 2015 fscrypt_free_dummy_policy(&ctx->dummy_enc_policy);
cebe85d5
LC		 2016 kfree(ctx);
2017}
2018
2019int ext4_init_fs_context(struct fs_context *fc)
2020{
da9e4802 2021 struct ext4_fs_context *ctx;
cebe85d5
LC		 2022
2023 ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2024 if (!ctx)
2025 return -ENOMEM;
2026
2027 fc->fs_private = ctx;
2028 fc->ops = &ext4_context_ops;
2029
2030 return 0;
2031}
2032
e6e268cb
LC		 2033#ifdef CONFIG_QUOTA
2034/*
2035 * Note the name of the specified quota file.
2036 */
2037static int note_qf_name(struct fs_context *fc, int qtype,
2038 struct fs_parameter *param)
2039{
2040 struct ext4_fs_context *ctx = fc->fs_private;
2041 char *qname;
2042
2043 if (param->size < 1) {
2044 ext4_msg(NULL, KERN_ERR, "Missing quota name");
2045 return -EINVAL;
2046 }
2047 if (strchr(param->string, '/')) {
2048 ext4_msg(NULL, KERN_ERR,
2049 "quotafile must be on filesystem root");
2050 return -EINVAL;
2051 }
2052 if (ctx->s_qf_names[qtype]) {
2053 if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) {
2054 ext4_msg(NULL, KERN_ERR,
2055 "%s quota file already specified",
2056 QTYPE2NAME(qtype));
2057 return -EINVAL;
2058 }
2059 return 0;
2060 }
2061
2062 qname = kmemdup_nul(param->string, param->size, GFP_KERNEL);
2063 if (!qname) {
2064 ext4_msg(NULL, KERN_ERR,
2065 "Not enough memory for storing quotafile name");
2066 return -ENOMEM;
2067 }
2068 ctx->s_qf_names[qtype] = qname;
2069 ctx->qname_spec |= 1 << qtype;
6e47a3cc 2070 ctx->spec |= EXT4_SPEC_JQUOTA;
e6e268cb
LC		 2071 return 0;
2072}
2073
2074/*
2075 * Clear the name of the specified quota file.
2076 */
2077static int unnote_qf_name(struct fs_context *fc, int qtype)
2078{
2079 struct ext4_fs_context *ctx = fc->fs_private;
2080
2081 if (ctx->s_qf_names[qtype])
2082 kfree(ctx->s_qf_names[qtype]);
2083
2084 ctx->s_qf_names[qtype] = NULL;
2085 ctx->qname_spec |= 1 << qtype;
6e47a3cc 2086 ctx->spec |= EXT4_SPEC_JQUOTA;
e6e268cb
LC		 2087 return 0;
2088}
2089#endif
2090
85456054
EB		 2091static int ext4_parse_test_dummy_encryption(const struct fs_parameter *param,
2092 struct ext4_fs_context *ctx)
2093{
2094 int err;
2095
2096 if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) {
2097 ext4_msg(NULL, KERN_WARNING,
2098 "test_dummy_encryption option not supported");
2099 return -EINVAL;
2100 }
2101 err = fscrypt_parse_test_dummy_encryption(param,
2102 &ctx->dummy_enc_policy);
2103 if (err == -EINVAL) {
2104 ext4_msg(NULL, KERN_WARNING,
2105 "Value of option \"%s\" is unrecognized", param->key);
2106 } else if (err == -EEXIST) {
2107 ext4_msg(NULL, KERN_WARNING,
2108 "Conflicting test_dummy_encryption options");
2109 return -EINVAL;
2110 }
2111 return err;
2112}
2113
6e47a3cc 2114#define EXT4_SET_CTX(name) \
4c246728
LC		 2115static inline void ctx_set_##name(struct ext4_fs_context *ctx, \
2116 unsigned long flag) \
6e47a3cc
LC		 2117{ \
2118 ctx->mask_s_##name |= flag; \
2119 ctx->vals_s_##name |= flag; \
e3952fcc
LC		 2120}
2121
2122#define EXT4_CLEAR_CTX(name) \
4c246728
LC		 2123static inline void ctx_clear_##name(struct ext4_fs_context *ctx, \
2124 unsigned long flag) \
6e47a3cc
LC		 2125{ \
2126 ctx->mask_s_##name |= flag; \
2127 ctx->vals_s_##name &= ~flag; \
e3952fcc
LC		 2128}
2129
2130#define EXT4_TEST_CTX(name) \
4c246728
LC		 2131static inline unsigned long \
2132ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag) \
6e47a3cc 2133{ \
4c246728 2134 return (ctx->vals_s_##name & flag); \
e3952fcc 2135}
6e47a3cc 2136
e3952fcc 2137EXT4_SET_CTX(flags); /* set only */
6e47a3cc 2138EXT4_SET_CTX(mount_opt);
e3952fcc
LC		 2139EXT4_CLEAR_CTX(mount_opt);
2140EXT4_TEST_CTX(mount_opt);
6e47a3cc 2141EXT4_SET_CTX(mount_opt2);
e3952fcc
LC		 2142EXT4_CLEAR_CTX(mount_opt2);
2143EXT4_TEST_CTX(mount_opt2);
2144
02f960f8 2145static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
26092bf5 2146{
461c3af0 2147 struct ext4_fs_context *ctx = fc->fs_private;
461c3af0 2148 struct fs_parse_result result;
26092bf5 2149 const struct mount_opts *m;
461c3af0 2150 int is_remount;
08cefc7a
EB		 2151 kuid_t uid;
2152 kgid_t gid;
461c3af0
LC		 2153 int token;
2154
2155 token = fs_parse(fc, ext4_param_specs, param, &result);
2156 if (token < 0)
2157 return token;
2158 is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
26092bf5 2159
ba2e524d
LC		 2160 for (m = ext4_mount_opts; m->token != Opt_err; m++)
2161 if (token == m->token)
2162 break;
2163
2164 ctx->opt_flags |= m->flags;
2165
2166 if (m->flags & MOPT_EXPLICIT) {
2167 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
2168 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC);
2169 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
2170 ctx_set_mount_opt2(ctx,
2171 EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM);
2172 } else
2173 return -EINVAL;
2174 }
2175
2176 if (m->flags & MOPT_NOSUPPORT) {
2177 ext4_msg(NULL, KERN_ERR, "%s option not supported",
2178 param->key);
2179 return 0;
2180 }
2181
2182 switch (token) {
57f73c2c 2183#ifdef CONFIG_QUOTA
ba2e524d 2184 case Opt_usrjquota:
461c3af0 2185 if (!*param->string)
e6e268cb 2186 return unnote_qf_name(fc, USRQUOTA);
461c3af0 2187 else
e6e268cb 2188 return note_qf_name(fc, USRQUOTA, param);
ba2e524d 2189 case Opt_grpjquota:
461c3af0 2190 if (!*param->string)
e6e268cb 2191 return unnote_qf_name(fc, GRPQUOTA);
461c3af0 2192 else
e6e268cb 2193 return note_qf_name(fc, GRPQUOTA, param);
57f73c2c 2194#endif
26092bf5 2195 case Opt_sb:
7edfd85b
LC		 2196 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2197 ext4_msg(NULL, KERN_WARNING,
2198 "Ignoring %s option on remount", param->key);
2199 } else {
2200 ctx->s_sb_block = result.uint_32;
2201 ctx->spec |= EXT4_SPEC_s_sb_block;
2202 }
02f960f8 2203 return 0;
26092bf5 2204 case Opt_removed:
da812f61 2205 ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option",
461c3af0 2206 param->key);
02f960f8 2207 return 0;
4f74d15f
EB		 2208 case Opt_inlinecrypt:
2209#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
6e47a3cc 2210 ctx_set_flags(ctx, SB_INLINECRYPT);
4f74d15f 2211#else
da812f61 2212 ext4_msg(NULL, KERN_ERR, "inline encryption not supported");
4f74d15f 2213#endif
02f960f8 2214 return 0;
461c3af0 2215 case Opt_errors:
6e47a3cc 2216 ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK);
ba2e524d
LC		 2217 ctx_set_mount_opt(ctx, result.uint_32);
2218 return 0;
2219#ifdef CONFIG_QUOTA
2220 case Opt_jqfmt:
2221 ctx->s_jquota_fmt = result.uint_32;
2222 ctx->spec |= EXT4_SPEC_JQFMT;
2223 return 0;
2224#endif
2225 case Opt_data:
2226 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2227 ctx_set_mount_opt(ctx, result.uint_32);
2228 ctx->spec |= EXT4_SPEC_DATAJ;
2229 return 0;
2230 case Opt_commit:
461c3af0 2231 if (result.uint_32 == 0)
934b0de1 2232 result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE;
461c3af0 2233 else if (result.uint_32 > INT_MAX / HZ) {
da812f61 2234 ext4_msg(NULL, KERN_ERR,
9ba55543 2235 "Invalid commit interval %d, "
2236 "must be smaller than %d",
461c3af0 2237 result.uint_32, INT_MAX / HZ);
da812f61 2238 return -EINVAL;
9ba55543 2239 }
6e47a3cc
LC		 2240 ctx->s_commit_interval = HZ * result.uint_32;
2241 ctx->spec |= EXT4_SPEC_s_commit_interval;
ba2e524d
LC		 2242 return 0;
2243 case Opt_debug_want_extra_isize:
6e47a3cc 2244 if ((result.uint_32 & 1) || (result.uint_32 < 4)) {
da812f61 2245 ext4_msg(NULL, KERN_ERR,
461c3af0 2246 "Invalid want_extra_isize %d", result.uint_32);
da812f61 2247 return -EINVAL;
9803387c 2248 }
6e47a3cc
LC		 2249 ctx->s_want_extra_isize = result.uint_32;
2250 ctx->spec |= EXT4_SPEC_s_want_extra_isize;
ba2e524d
LC		 2251 return 0;
2252 case Opt_max_batch_time:
6e47a3cc
LC		 2253 ctx->s_max_batch_time = result.uint_32;
2254 ctx->spec |= EXT4_SPEC_s_max_batch_time;
ba2e524d
LC		 2255 return 0;
2256 case Opt_min_batch_time:
6e47a3cc
LC		 2257 ctx->s_min_batch_time = result.uint_32;
2258 ctx->spec |= EXT4_SPEC_s_min_batch_time;
ba2e524d
LC		 2259 return 0;
2260 case Opt_inode_readahead_blks:
461c3af0
LC		 2261 if (result.uint_32 &&
2262 (result.uint_32 > (1 << 30) ||
2263 !is_power_of_2(result.uint_32))) {
da812f61 2264 ext4_msg(NULL, KERN_ERR,
e33e60ea
JK		 2265 "EXT4-fs: inode_readahead_blks must be "
2266 "0 or a power of 2 smaller than 2^31");
da812f61 2267 return -EINVAL;
5f3633e3 2268 }
6e47a3cc
LC		 2269 ctx->s_inode_readahead_blks = result.uint_32;
2270 ctx->spec |= EXT4_SPEC_s_inode_readahead_blks;
ba2e524d
LC		 2271 return 0;
2272 case Opt_init_itable:
6e47a3cc
LC		 2273 ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE);
2274 ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
461c3af0 2275 if (param->type == fs_value_is_string)
6e47a3cc
LC		 2276 ctx->s_li_wait_mult = result.uint_32;
2277 ctx->spec |= EXT4_SPEC_s_li_wait_mult;
ba2e524d
LC		 2278 return 0;
2279 case Opt_max_dir_size_kb:
6e47a3cc
LC		 2280 ctx->s_max_dir_size_kb = result.uint_32;
2281 ctx->spec |= EXT4_SPEC_s_max_dir_size_kb;
ba2e524d 2282 return 0;
8016e29f 2283#ifdef CONFIG_EXT4_DEBUG
ba2e524d 2284 case Opt_fc_debug_max_replay:
6e47a3cc
LC		 2285 ctx->s_fc_debug_max_replay = result.uint_32;
2286 ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay;
ba2e524d 2287 return 0;
8016e29f 2288#endif
ba2e524d 2289 case Opt_stripe:
6e47a3cc
LC		 2290 ctx->s_stripe = result.uint_32;
2291 ctx->spec |= EXT4_SPEC_s_stripe;
ba2e524d
LC		 2292 return 0;
2293 case Opt_resuid:
461c3af0 2294 uid = make_kuid(current_user_ns(), result.uint_32);
5f3633e3 2295 if (!uid_valid(uid)) {
da812f61 2296 ext4_msg(NULL, KERN_ERR, "Invalid uid value %d",
461c3af0 2297 result.uint_32);
da812f61 2298 return -EINVAL;
26092bf5 2299 }
6e47a3cc
LC		 2300 ctx->s_resuid = uid;
2301 ctx->spec |= EXT4_SPEC_s_resuid;
ba2e524d
LC		 2302 return 0;
2303 case Opt_resgid:
461c3af0 2304 gid = make_kgid(current_user_ns(), result.uint_32);
5f3633e3 2305 if (!gid_valid(gid)) {
da812f61 2306 ext4_msg(NULL, KERN_ERR, "Invalid gid value %d",
461c3af0 2307 result.uint_32);
da812f61 2308 return -EINVAL;
5f3633e3 2309 }
6e47a3cc
LC		 2310 ctx->s_resgid = gid;
2311 ctx->spec |= EXT4_SPEC_s_resgid;
ba2e524d
LC		 2312 return 0;
2313 case Opt_journal_dev:
5f3633e3 2314 if (is_remount) {
da812f61 2315 ext4_msg(NULL, KERN_ERR,
5f3633e3 2316 "Cannot specify journal on remount");
da812f61 2317 return -EINVAL;
5f3633e3 2318 }
461c3af0 2319 ctx->journal_devnum = result.uint_32;
6e47a3cc 2320 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
ba2e524d
LC		 2321 return 0;
2322 case Opt_journal_path:
2323 {
ad4eec61
ES		 2324 struct inode *journal_inode;
2325 struct path path;
2326 int error;
2327
2328 if (is_remount) {
da812f61 2329 ext4_msg(NULL, KERN_ERR,
ad4eec61 2330 "Cannot specify journal on remount");
da812f61 2331 return -EINVAL;
ad4eec61 2332 }
ad4eec61 2333
e3ea75ee 2334 error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path);
ad4eec61 2335 if (error) {
da812f61 2336 ext4_msg(NULL, KERN_ERR, "error: could not find "
461c3af0 2337 "journal device path");
da812f61 2338 return -EINVAL;
ad4eec61
ES		 2339 }
2340
2b0143b5 2341 journal_inode = d_inode(path.dentry);
461c3af0 2342 ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev);
6e47a3cc 2343 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
ad4eec61 2344 path_put(&path);
ba2e524d
LC		 2345 return 0;
2346 }
2347 case Opt_journal_ioprio:
461c3af0 2348 if (result.uint_32 > 7) {
da812f61 2349 ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority"
5f3633e3 2350 " (must be 0-7)");
da812f61 2351 return -EINVAL;
5f3633e3 2352 }
461c3af0
LC		 2353 ctx->journal_ioprio =
2354 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32);
6e47a3cc 2355 ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO;
ba2e524d
LC		 2356 return 0;
2357 case Opt_test_dummy_encryption:
85456054 2358 return ext4_parse_test_dummy_encryption(param, ctx);
ba2e524d
LC		 2359 case Opt_dax:
2360 case Opt_dax_type:
ef83b6e8 2361#ifdef CONFIG_FS_DAX
ba2e524d
LC		 2362 {
2363 int type = (token == Opt_dax) ?
2364 Opt_dax : result.uint_32;
2365
2366 switch (type) {
9cb20f94
IW		 2367 case Opt_dax:
2368 case Opt_dax_always:
ba2e524d 2369 ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
6e47a3cc 2370 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
9cb20f94
IW		 2371 break;
2372 case Opt_dax_never:
ba2e524d 2373 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
6e47a3cc 2374 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
9cb20f94
IW		 2375 break;
2376 case Opt_dax_inode:
6e47a3cc
LC		 2377 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2378 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
9cb20f94 2379 /* Strictly for printing options */
ba2e524d 2380 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);
9cb20f94
IW		 2381 break;
2382 }
ba2e524d
LC		 2383 return 0;
2384 }
ef83b6e8 2385#else
da812f61 2386 ext4_msg(NULL, KERN_INFO, "dax option not supported");
da812f61 2387 return -EINVAL;
5f3633e3 2388#endif
ba2e524d
LC		 2389 case Opt_data_err:
2390 if (result.uint_32 == Opt_data_err_abort)
2391 ctx_set_mount_opt(ctx, m->mount_opt);
2392 else if (result.uint_32 == Opt_data_err_ignore)
2393 ctx_clear_mount_opt(ctx, m->mount_opt);
2394 return 0;
2395 case Opt_mb_optimize_scan:
27b38686
OM		 2396 if (result.int_32 == 1) {
2397 ctx_set_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2398 ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2399 } else if (result.int_32 == 0) {
2400 ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2401 ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2402 } else {
da812f61 2403 ext4_msg(NULL, KERN_WARNING,
196e402a 2404 "mb_optimize_scan should be set to 0 or 1.");
da812f61 2405 return -EINVAL;
196e402a 2406 }
ba2e524d
LC		 2407 return 0;
2408 }
2409
2410 /*
2411 * At this point we should only be getting options requiring MOPT_SET,
2412 * or MOPT_CLEAR. Anything else is a bug
2413 */
2414 if (m->token == Opt_err) {
2415 ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s",
2416 param->key);
2417 WARN_ON(1);
2418 return -EINVAL;
2419 }
2420
2421 else {
461c3af0
LC		 2422 unsigned int set = 0;
2423
2424 if ((param->type == fs_value_is_flag) ||
2425 result.uint_32 > 0)
2426 set = 1;
2427
5f3633e3 2428 if (m->flags & MOPT_CLEAR)
461c3af0 2429 set = !set;
5f3633e3 2430 else if (unlikely(!(m->flags & MOPT_SET))) {
da812f61 2431 ext4_msg(NULL, KERN_WARNING,
461c3af0
LC		 2432 "buggy handling of option %s",
2433 param->key);
5f3633e3 2434 WARN_ON(1);
da812f61 2435 return -EINVAL;
5f3633e3 2436 }
995a3ed6 2437 if (m->flags & MOPT_2) {
461c3af0 2438 if (set != 0)
6e47a3cc 2439 ctx_set_mount_opt2(ctx, m->mount_opt);
995a3ed6 2440 else
6e47a3cc 2441 ctx_clear_mount_opt2(ctx, m->mount_opt);
995a3ed6 2442 } else {
461c3af0 2443 if (set != 0)
6e47a3cc 2444 ctx_set_mount_opt(ctx, m->mount_opt);
995a3ed6 2445 else
6e47a3cc 2446 ctx_clear_mount_opt(ctx, m->mount_opt);
995a3ed6 2447 }
26092bf5 2448 }
ba2e524d 2449
02f960f8 2450 return 0;
26092bf5
TT		 2451}
2452
7edfd85b 2453static int parse_options(struct fs_context *fc, char *options)
26092bf5 2454{
461c3af0 2455 struct fs_parameter param;
461c3af0
LC		 2456 int ret;
2457 char *key;
26092bf5
TT		 2458
2459 if (!options)
7edfd85b 2460 return 0;
461c3af0
LC		 2461
2462 while ((key = strsep(&options, ",")) != NULL) {
2463 if (*key) {
2464 size_t v_len = 0;
2465 char *value = strchr(key, '=');
2466
2467 param.type = fs_value_is_flag;
2468 param.string = NULL;
2469
2470 if (value) {
2471 if (value == key)
2472 continue;
2473
2474 *value++ = 0;
2475 v_len = strlen(value);
2476 param.string = kmemdup_nul(value, v_len,
2477 GFP_KERNEL);
2478 if (!param.string)
7edfd85b 2479 return -ENOMEM;
461c3af0
LC		 2480 param.type = fs_value_is_string;
2481 }
2482
2483 param.key = key;
2484 param.size = v_len;
2485
02f960f8 2486 ret = ext4_parse_param(fc, &param);
461c3af0
LC		 2487 if (param.string)
2488 kfree(param.string);
2489 if (ret < 0)
7edfd85b 2490 return ret;
461c3af0 2491 }
ac27a0ec 2492 }
461c3af0 2493
7edfd85b 2494 ret = ext4_validate_options(fc);
da812f61 2495 if (ret < 0)
7edfd85b 2496 return ret;
da812f61 2497
7edfd85b
LC		 2498 return 0;
2499}
2500
2501static int parse_apply_sb_mount_options(struct super_block *sb,
2502 struct ext4_fs_context *m_ctx)
2503{
2504 struct ext4_sb_info *sbi = EXT4_SB(sb);
2505 char *s_mount_opts = NULL;
2506 struct ext4_fs_context *s_ctx = NULL;
2507 struct fs_context *fc = NULL;
2508 int ret = -ENOMEM;
2509
2510 if (!sbi->s_es->s_mount_opts[0])
e6e268cb
LC		 2511 return 0;
2512
7edfd85b
LC		 2513 s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
2514 sizeof(sbi->s_es->s_mount_opts),
2515 GFP_KERNEL);
2516 if (!s_mount_opts)
2517 return ret;
2518
2519 fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL);
2520 if (!fc)
2521 goto out_free;
2522
2523 s_ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2524 if (!s_ctx)
2525 goto out_free;
2526
2527 fc->fs_private = s_ctx;
2528 fc->s_fs_info = sbi;
2529
2530 ret = parse_options(fc, s_mount_opts);
6e47a3cc 2531 if (ret < 0)
7edfd85b 2532 goto parse_failed;
e6e268cb 2533
7edfd85b
LC		 2534 ret = ext4_check_opt_consistency(fc, sb);
2535 if (ret < 0) {
2536parse_failed:
2537 ext4_msg(sb, KERN_WARNING,
2538 "failed to parse options in superblock: %s",
2539 s_mount_opts);
2540 ret = 0;
2541 goto out_free;
2542 }
2543
2544 if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV)
2545 m_ctx->journal_devnum = s_ctx->journal_devnum;
2546 if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)
2547 m_ctx->journal_ioprio = s_ctx->journal_ioprio;
2548
85456054
EB		 2549 ext4_apply_options(fc, sb);
2550 ret = 0;
7edfd85b
LC		 2551
2552out_free:
c069db76
EB		 2553 if (fc) {
2554 ext4_fc_free(fc);
2555 kfree(fc);
2556 }
7edfd85b
LC		 2557 kfree(s_mount_opts);
2558 return ret;
4c94bff9
LC		 2559}
2560
e6e268cb
LC		 2561static void ext4_apply_quota_options(struct fs_context *fc,
2562 struct super_block *sb)
2563{
2564#ifdef CONFIG_QUOTA
6e47a3cc 2565 bool quota_feature = ext4_has_feature_quota(sb);
e6e268cb
LC		 2566 struct ext4_fs_context *ctx = fc->fs_private;
2567 struct ext4_sb_info *sbi = EXT4_SB(sb);
2568 char *qname;
2569 int i;
2570
6e47a3cc
LC		 2571 if (quota_feature)
2572 return;
2573
2574 if (ctx->spec & EXT4_SPEC_JQUOTA) {
2575 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2576 if (!(ctx->qname_spec & (1 << i)))
2577 continue;
2578
2579 qname = ctx->s_qf_names[i]; /* May be NULL */
4c1bd5a9
LC		 2580 if (qname)
2581 set_opt(sb, QUOTA);
6e47a3cc 2582 ctx->s_qf_names[i] = NULL;
13b215a9
LC		 2583 qname = rcu_replace_pointer(sbi->s_qf_names[i], qname,
2584 lockdep_is_held(&sb->s_umount));
2585 if (qname)
10e4f310 2586 kfree_rcu_mightsleep(qname);
6e47a3cc 2587 }
e6e268cb 2588 }
6e47a3cc
LC		 2589
2590 if (ctx->spec & EXT4_SPEC_JQFMT)
2591 sbi->s_jquota_fmt = ctx->s_jquota_fmt;
e6e268cb
LC		 2592#endif
2593}
2594
2595/*
2596 * Check quota settings consistency.
2597 */
2598static int ext4_check_quota_consistency(struct fs_context *fc,
2599 struct super_block *sb)
2600{
2601#ifdef CONFIG_QUOTA
2602 struct ext4_fs_context *ctx = fc->fs_private;
2603 struct ext4_sb_info *sbi = EXT4_SB(sb);
2604 bool quota_feature = ext4_has_feature_quota(sb);
2605 bool quota_loaded = sb_any_quota_loaded(sb);
6e47a3cc
LC		 2606 bool usr_qf_name, grp_qf_name, usrquota, grpquota;
2607 int quota_flags, i;
2608
2609 /*
2610 * We do the test below only for project quotas. 'usrquota' and
2611 * 'grpquota' mount options are allowed even without quota feature
2612 * to support legacy quotas in quota files.
2613 */
2614 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) &&
2615 !ext4_has_feature_project(sb)) {
2616 ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. "
2617 "Cannot enable project quota enforcement.");
2618 return -EINVAL;
2619 }
e6e268cb 2620
6e47a3cc
LC		 2621 quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
2622 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA;
2623 if (quota_loaded &&
2624 ctx->mask_s_mount_opt & quota_flags &&
2625 !ctx_test_mount_opt(ctx, quota_flags))
2626 goto err_quota_change;
2627
2628 if (ctx->spec & EXT4_SPEC_JQUOTA) {
e6e268cb
LC		 2629
2630 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2631 if (!(ctx->qname_spec & (1 << i)))
2632 continue;
2633
6e47a3cc
LC		 2634 if (quota_loaded &&
2635 !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i])
e6e268cb
LC		 2636 goto err_jquota_change;
2637
2638 if (sbi->s_qf_names[i] && ctx->s_qf_names[i] &&
13b215a9 2639 strcmp(get_qf_name(sb, sbi, i),
e6e268cb
LC		 2640 ctx->s_qf_names[i]) != 0)
2641 goto err_jquota_specified;
2642 }
6e47a3cc
LC		 2643
2644 if (quota_feature) {
2645 ext4_msg(NULL, KERN_INFO,
2646 "Journaled quota options ignored when "
2647 "QUOTA feature is enabled");
2648 return 0;
2649 }
e6e268cb
LC		 2650 }
2651
6e47a3cc 2652 if (ctx->spec & EXT4_SPEC_JQFMT) {
e6e268cb 2653 if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded)
6e47a3cc 2654 goto err_jquota_change;
e6e268cb
LC		 2655 if (quota_feature) {
2656 ext4_msg(NULL, KERN_INFO, "Quota format mount options "
2657 "ignored when QUOTA feature is enabled");
2658 return 0;
2659 }
2660 }
6e47a3cc
LC		 2661
2662 /* Make sure we don't mix old and new quota format */
2663 usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) ||
2664 ctx->s_qf_names[USRQUOTA]);
2665 grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) ||
2666 ctx->s_qf_names[GRPQUOTA]);
2667
2668 usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2669 test_opt(sb, USRQUOTA));
2670
2671 grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) ||
2672 test_opt(sb, GRPQUOTA));
2673
2674 if (usr_qf_name) {
2675 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2676 usrquota = false;
2677 }
2678 if (grp_qf_name) {
2679 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2680 grpquota = false;
2681 }
2682
2683 if (usr_qf_name || grp_qf_name) {
2684 if (usrquota || grpquota) {
2685 ext4_msg(NULL, KERN_ERR, "old and new quota "
2686 "format mixing");
2687 return -EINVAL;
2688 }
2689
2690 if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) {
2691 ext4_msg(NULL, KERN_ERR, "journaled quota format "
2692 "not specified");
2693 return -EINVAL;
2694 }
2695 }
2696
e6e268cb
LC		 2697 return 0;
2698
2699err_quota_change:
2700 ext4_msg(NULL, KERN_ERR,
2701 "Cannot change quota options when quota turned on");
2702 return -EINVAL;
2703err_jquota_change:
2704 ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota "
2705 "options when quota turned on");
2706 return -EINVAL;
2707err_jquota_specified:
2708 ext4_msg(NULL, KERN_ERR, "%s quota file already specified",
2709 QTYPE2NAME(i));
2710 return -EINVAL;
e6e268cb
LC		 2711#else
2712 return 0;
2713#endif
2714}
2715
5f41fdae
EB		 2716static int ext4_check_test_dummy_encryption(const struct fs_context *fc,
2717 struct super_block *sb)
2718{
5f41fdae
EB		 2719 const struct ext4_fs_context *ctx = fc->fs_private;
2720 const struct ext4_sb_info *sbi = EXT4_SB(sb);
2721
85456054 2722 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy))
5f41fdae
EB		 2723 return 0;
2724
2725 if (!ext4_has_feature_encrypt(sb)) {
2726 ext4_msg(NULL, KERN_WARNING,
2727 "test_dummy_encryption requires encrypt feature");
2728 return -EINVAL;
2729 }
2730 /*
2731 * This mount option is just for testing, and it's not worthwhile to
2732 * implement the extra complexity (e.g. RCU protection) that would be
2733 * needed to allow it to be set or changed during remount. We do allow
2734 * it to be specified during remount, but only if there is no change.
2735 */
85456054
EB		 2736 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2737 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2738 &ctx->dummy_enc_policy))
2739 return 0;
5f41fdae 2740 ext4_msg(NULL, KERN_WARNING,
85456054 2741 "Can't set or change test_dummy_encryption on remount");
5f41fdae
EB		 2742 return -EINVAL;
2743 }
85456054
EB		 2744 /* Also make sure s_mount_opts didn't contain a conflicting value. */
2745 if (fscrypt_is_dummy_policy_set(&sbi->s_dummy_enc_policy)) {
2746 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2747 &ctx->dummy_enc_policy))
2748 return 0;
2749 ext4_msg(NULL, KERN_WARNING,
2750 "Conflicting test_dummy_encryption options");
2751 return -EINVAL;
2752 }
7959eb19 2753 return 0;
85456054
EB		 2754}
2755
2756static void ext4_apply_test_dummy_encryption(struct ext4_fs_context *ctx,
2757 struct super_block *sb)
2758{
2759 if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy) ||
2760 /* if already set, it was already verified to be the same */
2761 fscrypt_is_dummy_policy_set(&EXT4_SB(sb)->s_dummy_enc_policy))
2762 return;
2763 EXT4_SB(sb)->s_dummy_enc_policy = ctx->dummy_enc_policy;
2764 memset(&ctx->dummy_enc_policy, 0, sizeof(ctx->dummy_enc_policy));
2765 ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
5f41fdae
EB		 2766}
2767
b6bd2435
LC		 2768static int ext4_check_opt_consistency(struct fs_context *fc,
2769 struct super_block *sb)
2770{
2771 struct ext4_fs_context *ctx = fc->fs_private;
6e47a3cc
LC		 2772 struct ext4_sb_info *sbi = fc->s_fs_info;
2773 int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
5f41fdae 2774 int err;
b6bd2435
LC		 2775
2776 if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
2777 ext4_msg(NULL, KERN_ERR,
2778 "Mount option(s) incompatible with ext2");
2779 return -EINVAL;
2780 }
2781 if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
2782 ext4_msg(NULL, KERN_ERR,
2783 "Mount option(s) incompatible with ext3");
2784 return -EINVAL;
2785 }
2786
6e47a3cc
LC		 2787 if (ctx->s_want_extra_isize >
2788 (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) {
2789 ext4_msg(NULL, KERN_ERR,
2790 "Invalid want_extra_isize %d",
2791 ctx->s_want_extra_isize);
2792 return -EINVAL;
2793 }
2794
5f41fdae
EB		 2795 err = ext4_check_test_dummy_encryption(fc, sb);
2796 if (err)
2797 return err;
6e47a3cc
LC		 2798
2799 if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) {
2800 if (!sbi->s_journal) {
2801 ext4_msg(NULL, KERN_WARNING,
2802 "Remounting file system with no journal "
2803 "so ignoring journalled data option");
2804 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
4c246728
LC		 2805 } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) !=
2806 test_opt(sb, DATA_FLAGS)) {
6e47a3cc
LC		 2807 ext4_msg(NULL, KERN_ERR, "Cannot change data mode "
2808 "on remount");
2809 return -EINVAL;
2810 }
2811 }
2812
2813 if (is_remount) {
2814 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2815 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2816 ext4_msg(NULL, KERN_ERR, "can't mount with "
2817 "both data=journal and dax");
2818 return -EINVAL;
2819 }
2820
2821 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2822 (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2823 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2824fail_dax_change_remount:
2825 ext4_msg(NULL, KERN_ERR, "can't change "
2826 "dax mount option while remounting");
2827 return -EINVAL;
2828 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) &&
2829 (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2830 (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) {
2831 goto fail_dax_change_remount;
2832 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) &&
2833 ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2834 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2835 !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) {
2836 goto fail_dax_change_remount;
2837 }
2838 }
2839
b6bd2435
LC		 2840 return ext4_check_quota_consistency(fc, sb);
2841}
2842
85456054 2843static void ext4_apply_options(struct fs_context *fc, struct super_block *sb)
4c94bff9 2844{
6e47a3cc 2845 struct ext4_fs_context *ctx = fc->fs_private;
da812f61 2846 struct ext4_sb_info *sbi = fc->s_fs_info;
6e47a3cc
LC		 2847
2848 sbi->s_mount_opt &= ~ctx->mask_s_mount_opt;
2849 sbi->s_mount_opt |= ctx->vals_s_mount_opt;
2850 sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2;
2851 sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2;
6e47a3cc
LC		 2852 sb->s_flags &= ~ctx->mask_s_flags;
2853 sb->s_flags |= ctx->vals_s_flags;
2854
2855#define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; })
2856 APPLY(s_commit_interval);
2857 APPLY(s_stripe);
2858 APPLY(s_max_batch_time);
2859 APPLY(s_min_batch_time);
2860 APPLY(s_want_extra_isize);
2861 APPLY(s_inode_readahead_blks);
2862 APPLY(s_max_dir_size_kb);
2863 APPLY(s_li_wait_mult);
2864 APPLY(s_resgid);
2865 APPLY(s_resuid);
2866
2867#ifdef CONFIG_EXT4_DEBUG
2868 APPLY(s_fc_debug_max_replay);
2869#endif
2870
2871 ext4_apply_quota_options(fc, sb);
85456054 2872 ext4_apply_test_dummy_encryption(ctx, sb);
6e47a3cc
LC		 2873}
2874
2875
2876static int ext4_validate_options(struct fs_context *fc)
2877{
ac27a0ec 2878#ifdef CONFIG_QUOTA
6e47a3cc 2879 struct ext4_fs_context *ctx = fc->fs_private;
4c94bff9 2880 char *usr_qf_name, *grp_qf_name;
6e47a3cc
LC		 2881
2882 usr_qf_name = ctx->s_qf_names[USRQUOTA];
2883 grp_qf_name = ctx->s_qf_names[GRPQUOTA];
2884
33458eab 2885 if (usr_qf_name || grp_qf_name) {
6e47a3cc
LC		 2886 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name)
2887 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
ac27a0ec 2888
6e47a3cc
LC		 2889 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name)
2890 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
ac27a0ec 2891
6e47a3cc
LC		 2892 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2893 ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) {
da812f61 2894 ext4_msg(NULL, KERN_ERR, "old and new quota "
6e47a3cc 2895 "format mixing");
da812f61 2896 return -EINVAL;
ac27a0ec 2897 }
ac27a0ec
DK		 2898 }
2899#endif
6e47a3cc 2900 return 1;
ac27a0ec
DK		 2901}
2902
2adf6da8
TT		 2903static inline void ext4_show_quota_options(struct seq_file *seq,
2904 struct super_block *sb)
2905{
2906#if defined(CONFIG_QUOTA)
2907 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2908 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2909
2910 if (sbi->s_jquota_fmt) {
2911 char *fmtname = "";
2912
2913 switch (sbi->s_jquota_fmt) {
2914 case QFMT_VFS_OLD:
2915 fmtname = "vfsold";
2916 break;
2917 case QFMT_VFS_V0:
2918 fmtname = "vfsv0";
2919 break;
2920 case QFMT_VFS_V1:
2921 fmtname = "vfsv1";
2922 break;
2923 }
2924 seq_printf(seq, ",jqfmt=%s", fmtname);
2925 }
2926
33458eab
TT		 2927 rcu_read_lock();
2928 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2929 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2930 if (usr_qf_name)
2931 seq_show_option(seq, "usrjquota", usr_qf_name);
2932 if (grp_qf_name)
2933 seq_show_option(seq, "grpjquota", grp_qf_name);
2934 rcu_read_unlock();
2adf6da8
TT		 2935#endif
2936}
2937
5a916be1
TT		 2938static const char *token2str(int token)
2939{
97d8a670 2940 const struct fs_parameter_spec *spec;
5a916be1 2941
97d8a670
LC		 2942 for (spec = ext4_param_specs; spec->name != NULL; spec++)
2943 if (spec->opt == token && !spec->type)
5a916be1 2944 break;
97d8a670 2945 return spec->name;
5a916be1
TT		 2946}
2947
2adf6da8
TT		 2948/*
2949 * Show an option if
2950 * - it's set to a non-default value OR
2951 * - if the per-sb default is different from the global default
2952 */
66acdcf4
TT		 2953static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2954 int nodefs)
2adf6da8 2955{
2adf6da8
TT		 2956 struct ext4_sb_info *sbi = EXT4_SB(sb);
2957 struct ext4_super_block *es = sbi->s_es;
e3645d72 2958 int def_errors;
5a916be1 2959 const struct mount_opts *m;
66acdcf4 2960 char sep = nodefs ? '\n' : ',';
2adf6da8 2961
66acdcf4
TT		 2962#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2963#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2964
2965 if (sbi->s_sb_block != 1)
5a916be1
TT		 2966 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2967
2968 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2969 int want_set = m->flags & MOPT_SET;
e3645d72
ZY		 2970 int opt_2 = m->flags & MOPT_2;
2971 unsigned int mount_opt, def_mount_opt;
2972
5a916be1 2973 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
ba2e524d 2974 m->flags & MOPT_SKIP)
5a916be1 2975 continue;
e3645d72
ZY		 2976
2977 if (opt_2) {
2978 mount_opt = sbi->s_mount_opt2;
2979 def_mount_opt = sbi->s_def_mount_opt2;
2980 } else {
2981 mount_opt = sbi->s_mount_opt;
2982 def_mount_opt = sbi->s_def_mount_opt;
2983 }
2984 /* skip if same as the default */
2985 if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt)))
2986 continue;
2987 /* select Opt_noFoo vs Opt_Foo */
5a916be1 2988 if ((want_set &&
e3645d72
ZY		 2989 (mount_opt & m->mount_opt) != m->mount_opt) ||
2990 (!want_set && (mount_opt & m->mount_opt)))
2991 continue;
5a916be1 2992 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2993 }
5a916be1 2994
08cefc7a 2995 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2996 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2997 SEQ_OPTS_PRINT("resuid=%u",
2998 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2999 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 3000 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 3001 SEQ_OPTS_PRINT("resgid=%u",
3002 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 3003 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 3004 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
3005 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 3006 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 3007 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 3008 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 3009 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 3010 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 3011 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 3012 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 3013 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 3014 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 3015 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
66acdcf4 3016 if (nodefs || sbi->s_stripe)
5a916be1 3017 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0 3018 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
e3645d72 3019 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
5a916be1
TT		 3020 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3021 SEQ_OPTS_PUTS("data=journal");
3022 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3023 SEQ_OPTS_PUTS("data=ordered");
3024 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
3025 SEQ_OPTS_PUTS("data=writeback");
3026 }
66acdcf4
TT		 3027 if (nodefs ||
3028 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 3029 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
3030 sbi->s_inode_readahead_blks);
2adf6da8 3031
ceec0376 3032 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 3033 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 3034 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 3035 if (nodefs || sbi->s_max_dir_size_kb)
3036 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 3037 if (test_opt(sb, DATA_ERR_ABORT))
3038 SEQ_OPTS_PUTS("data_err=abort");
ed318a6c
EB		 3039
3040 fscrypt_show_test_dummy_encryption(seq, sep, sb);
2adf6da8 3041
4f74d15f
EB		 3042 if (sb->s_flags & SB_INLINECRYPT)
3043 SEQ_OPTS_PUTS("inlinecrypt");
3044
9cb20f94
IW		 3045 if (test_opt(sb, DAX_ALWAYS)) {
3046 if (IS_EXT2_SB(sb))
3047 SEQ_OPTS_PUTS("dax");
3048 else
3049 SEQ_OPTS_PUTS("dax=always");
3050 } else if (test_opt2(sb, DAX_NEVER)) {
3051 SEQ_OPTS_PUTS("dax=never");
3052 } else if (test_opt2(sb, DAX_INODE)) {
3053 SEQ_OPTS_PUTS("dax=inode");
3054 }
3fa5d23e
OM		 3055
3056 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3057 !test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3058 SEQ_OPTS_PUTS("mb_optimize_scan=0");
3059 } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3060 test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3061 SEQ_OPTS_PUTS("mb_optimize_scan=1");
3062 }
3063
2adf6da8 3064 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 3065 return 0;
3066}
3067
66acdcf4
TT		 3068static int ext4_show_options(struct seq_file *seq, struct dentry *root)
3069{
3070 return _ext4_show_options(seq, root->d_sb, 0);
3071}
3072
ebd173be 3073int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 3074{
3075 struct super_block *sb = seq->private;
3076 int rc;
3077
bc98a42c 3078 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 3079 rc = _ext4_show_options(seq, sb, 1);
3080 seq_puts(seq, "\n");
3081 return rc;
3082}
3083
617ba13b 3084static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 3085 int read_only)
3086{
617ba13b 3087 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 3088 int err = 0;
ac27a0ec 3089
617ba13b 3090 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 3091 ext4_msg(sb, KERN_ERR, "revision level too high, "
3092 "forcing read-only mode");
c89128a0 3093 err = -EROFS;
5adaccac 3094 goto done;
ac27a0ec
DK		 3095 }
3096 if (read_only)
281b5995 3097 goto done;
617ba13b 3098 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 3099 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
3100 "running e2fsck is recommended");
c8b459f4 3101 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 3102 ext4_msg(sb, KERN_WARNING,
3103 "warning: mounting fs with errors, "
3104 "running e2fsck is recommended");
ed3ce80a 3105 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 3106 le16_to_cpu(es->s_mnt_count) >=
3107 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 3108 ext4_msg(sb, KERN_WARNING,
3109 "warning: maximal mount count reached, "
3110 "running e2fsck is recommended");
ac27a0ec 3111 else if (le32_to_cpu(es->s_checkinterval) &&
6a0678a7
AB		 3112 (ext4_get_tstamp(es, s_lastcheck) +
3113 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
b31e1552
ES		 3114 ext4_msg(sb, KERN_WARNING,
3115 "warning: checktime reached, "
3116 "running e2fsck is recommended");
0b8e58a1 3117 if (!sbi->s_journal)
0390131b 3118 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 3119 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 3120 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 3121 le16_add_cpu(&es->s_mnt_count, 1);
6a0678a7 3122 ext4_update_tstamp(es, s_mtime);
02f310fc 3123 if (sbi->s_journal) {
e2b911c5 3124 ext4_set_feature_journal_needs_recovery(sb);
02f310fc
JK		 3125 if (ext4_has_feature_orphan_file(sb))
3126 ext4_set_feature_orphan_present(sb);
3127 }
ac27a0ec 3128
4392fbc4 3129 err = ext4_commit_super(sb);
281b5995 3130done:
ac27a0ec 3131 if (test_opt(sb, DEBUG))
a9df9a49 3132 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 3133 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 3134 sb->s_blocksize,
3135 sbi->s_groups_count,
617ba13b
MC		 3136 EXT4_BLOCKS_PER_GROUP(sb),
3137 EXT4_INODES_PER_GROUP(sb),
a2595b8a 3138 sbi->s_mount_opt, sbi->s_mount_opt2);
c89128a0 3139 return err;
ac27a0ec
DK		 3140}
3141
117fff10
TT		 3142int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
3143{
3144 struct ext4_sb_info *sbi = EXT4_SB(sb);
7c990728 3145 struct flex_groups **old_groups, **new_groups;
37b0b6b8 3146 int size, i, j;
117fff10
TT		 3147
3148 if (!sbi->s_log_groups_per_flex)
3149 return 0;
3150
3151 size = ext4_flex_group(sbi, ngroup - 1) + 1;
3152 if (size <= sbi->s_flex_groups_allocated)
3153 return 0;
3154
7c990728
SJS		 3155 new_groups = kvzalloc(roundup_pow_of_two(size *
3156 sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
117fff10 3157 if (!new_groups) {
7c990728
SJS		 3158 ext4_msg(sb, KERN_ERR,
3159 "not enough memory for %d flex group pointers", size);
117fff10
TT		 3160 return -ENOMEM;
3161 }
7c990728
SJS		 3162 for (i = sbi->s_flex_groups_allocated; i < size; i++) {
3163 new_groups[i] = kvzalloc(roundup_pow_of_two(
3164 sizeof(struct flex_groups)),
3165 GFP_KERNEL);
3166 if (!new_groups[i]) {
37b0b6b8
DC		 3167 for (j = sbi->s_flex_groups_allocated; j < i; j++)
3168 kvfree(new_groups[j]);
7c990728
SJS		 3169 kvfree(new_groups);
3170 ext4_msg(sb, KERN_ERR,
3171 "not enough memory for %d flex groups", size);
3172 return -ENOMEM;
3173 }
117fff10 3174 }
7c990728
SJS		 3175 rcu_read_lock();
3176 old_groups = rcu_dereference(sbi->s_flex_groups);
3177 if (old_groups)
3178 memcpy(new_groups, old_groups,
3179 (sbi->s_flex_groups_allocated *
3180 sizeof(struct flex_groups *)));
3181 rcu_read_unlock();
3182 rcu_assign_pointer(sbi->s_flex_groups, new_groups);
3183 sbi->s_flex_groups_allocated = size;
3184 if (old_groups)
3185 ext4_kvfree_array_rcu(old_groups);
117fff10
TT		 3186 return 0;
3187}
3188
772cb7c8
JS		 3189static int ext4_fill_flex_info(struct super_block *sb)
3190{
3191 struct ext4_sb_info *sbi = EXT4_SB(sb);
3192 struct ext4_group_desc *gdp = NULL;
7c990728 3193 struct flex_groups *fg;
772cb7c8 3194 ext4_group_t flex_group;
117fff10 3195 int i, err;
772cb7c8 3196
503358ae 3197 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 3198 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 3199 sbi->s_log_groups_per_flex = 0;
3200 return 1;
3201 }
3202
117fff10
TT		 3203 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
3204 if (err)
9933fc0a 3205 goto failed;
772cb7c8 3206
772cb7c8 3207 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 3208 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 3209
3210 flex_group = ext4_flex_group(sbi, i);
7c990728
SJS		 3211 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
3212 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
90ba983f 3213 atomic64_add(ext4_free_group_clusters(sb, gdp),
7c990728
SJS		 3214 &fg->free_clusters);
3215 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
772cb7c8
JS		 3216 }
3217
3218 return 1;
3219failed:
3220 return 0;
3221}
3222
e2b911c5 3223static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 3224 struct ext4_group_desc *gdp)
717d50e4 3225{
b47820ed 3226 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 3227 __u16 crc = 0;
feb0ab32 3228 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 3229 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 3230
9aa5d32b 3231 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 3232 /* Use new metadata_csum algorithm */
feb0ab32 3233 __u32 csum32;
b47820ed 3234 __u16 dummy_csum = 0;
feb0ab32 3235
feb0ab32
DW		 3236 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
3237 sizeof(le_group));
b47820ed
DJ		 3238 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
3239 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
3240 sizeof(dummy_csum));
3241 offset += sizeof(dummy_csum);
3242 if (offset < sbi->s_desc_size)
3243 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
3244 sbi->s_desc_size - offset);
feb0ab32
DW		 3245
3246 crc = csum32 & 0xFFFF;
3247 goto out;
717d50e4
AD		 3248 }
3249
feb0ab32 3250 /* old crc16 code */
e2b911c5 3251 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 3252 return 0;
3253
feb0ab32
DW		 3254 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
3255 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
3256 crc = crc16(crc, (__u8 *)gdp, offset);
3257 offset += sizeof(gdp->bg_checksum); /* skip checksum */
3258 /* for checksum of struct ext4_group_desc do the rest...*/
4f043518 3259 if (ext4_has_feature_64bit(sb) && offset < sbi->s_desc_size)
feb0ab32 3260 crc = crc16(crc, (__u8 *)gdp + offset,
4f043518 3261 sbi->s_desc_size - offset);
feb0ab32
DW		 3262
3263out:
717d50e4
AD		 3264 return cpu_to_le16(crc);
3265}
3266
feb0ab32 3267int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 3268 struct ext4_group_desc *gdp)
3269{
feb0ab32 3270 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 3271 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 3272 return 0;
3273
3274 return 1;
3275}
3276
feb0ab32
DW		 3277void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
3278 struct ext4_group_desc *gdp)
3279{
3280 if (!ext4_has_group_desc_csum(sb))
3281 return;
e2b911c5 3282 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 3283}
3284
ac27a0ec 3285/* Called at mount-time, super-block is locked */
bfff6873 3286static int ext4_check_descriptors(struct super_block *sb,
829fa70d 3287 ext4_fsblk_t sb_block,
bfff6873 3288 ext4_group_t *first_not_zeroed)
ac27a0ec 3289{
617ba13b
MC		 3290 struct ext4_sb_info *sbi = EXT4_SB(sb);
3291 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
3292 ext4_fsblk_t last_block;
44de022c 3293 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 3294 ext4_fsblk_t block_bitmap;
3295 ext4_fsblk_t inode_bitmap;
3296 ext4_fsblk_t inode_table;
ce421581 3297 int flexbg_flag = 0;
bfff6873 3298 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 3299
e2b911c5 3300 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 3301 flexbg_flag = 1;
3302
af5bc92d 3303 ext4_debug("Checking group descriptors");
ac27a0ec 3304
197cd65a
AM		 3305 for (i = 0; i < sbi->s_groups_count; i++) {
3306 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
3307
ce421581 3308 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 3309 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 3310 else
3311 last_block = first_block +
617ba13b 3312 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 3313
bfff6873
LC		 3314 if ((grp == sbi->s_groups_count) &&
3315 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3316 grp = i;
3317
8fadc143 3318 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 3319 if (block_bitmap == sb_block) {
3320 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3321 "Block bitmap for group %u overlaps "
3322 "superblock", i);
18db4b4e
TT		 3323 if (!sb_rdonly(sb))
3324 return 0;
829fa70d 3325 }
77260807
TT		 3326 if (block_bitmap >= sb_block + 1 &&
3327 block_bitmap <= last_bg_block) {
3328 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3329 "Block bitmap for group %u overlaps "
3330 "block group descriptors", i);
3331 if (!sb_rdonly(sb))
3332 return 0;
3333 }
2b2d6d01 3334 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 3335 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 3336 "Block bitmap for group %u not in group "
b31e1552 3337 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 3338 return 0;
3339 }
8fadc143 3340 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 3341 if (inode_bitmap == sb_block) {
3342 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3343 "Inode bitmap for group %u overlaps "
3344 "superblock", i);
18db4b4e
TT		 3345 if (!sb_rdonly(sb))
3346 return 0;
829fa70d 3347 }
77260807
TT		 3348 if (inode_bitmap >= sb_block + 1 &&
3349 inode_bitmap <= last_bg_block) {
3350 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3351 "Inode bitmap for group %u overlaps "
3352 "block group descriptors", i);
3353 if (!sb_rdonly(sb))
3354 return 0;
3355 }
2b2d6d01 3356 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 3357 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 3358 "Inode bitmap for group %u not in group "
b31e1552 3359 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 3360 return 0;
3361 }
8fadc143 3362 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 3363 if (inode_table == sb_block) {
3364 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3365 "Inode table for group %u overlaps "
3366 "superblock", i);
18db4b4e
TT		 3367 if (!sb_rdonly(sb))
3368 return 0;
829fa70d 3369 }
77260807
TT		 3370 if (inode_table >= sb_block + 1 &&
3371 inode_table <= last_bg_block) {
3372 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3373 "Inode table for group %u overlaps "
3374 "block group descriptors", i);
3375 if (!sb_rdonly(sb))
3376 return 0;
3377 }
bd81d8ee 3378 if (inode_table < first_block ||
2b2d6d01 3379 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 3380 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 3381 "Inode table for group %u not in group "
b31e1552 3382 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 3383 return 0;
3384 }
955ce5f5 3385 ext4_lock_group(sb, i);
feb0ab32 3386 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 3387 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3388 "Checksum for group %u failed (%u!=%u)",
e2b911c5 3389 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 3390 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 3391 if (!sb_rdonly(sb)) {
955ce5f5 3392 ext4_unlock_group(sb, i);
8a266467 3393 return 0;
7ee1ec4c 3394 }
717d50e4 3395 }
955ce5f5 3396 ext4_unlock_group(sb, i);
ce421581
JS		 3397 if (!flexbg_flag)
3398 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 3399 }
bfff6873
LC		 3400 if (NULL != first_not_zeroed)
3401 *first_not_zeroed = grp;
ac27a0ec
DK		 3402 return 1;
3403}
3404
cd2291a4
ES		 3405/*
3406 * Maximal extent format file size.
3407 * Resulting logical blkno at s_maxbytes must fit in our on-disk
3408 * extent format containers, within a sector_t, and within i_blocks
3409 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
3410 * so that won't be a limiting factor.
3411 *
f17722f9
LC		 3412 * However there is other limiting factor. We do store extents in the form
3413 * of starting block and length, hence the resulting length of the extent
3414 * covering maximum file size must fit into on-disk format containers as
3415 * well. Given that length is always by 1 unit bigger than max unit (because
3416 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
3417 *
cd2291a4
ES		 3418 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
3419 */
f287a1a5 3420static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 3421{
3422 loff_t res;
3423 loff_t upper_limit = MAX_LFS_FILESIZE;
3424
72deb455
CH		 3425 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
3426
3427 if (!has_huge_files) {
cd2291a4
ES		 3428 upper_limit = (1LL << 32) - 1;
3429
3430 /* total blocks in file system block size */
3431 upper_limit >>= (blkbits - 9);
3432 upper_limit <<= blkbits;
3433 }
3434
f17722f9
LC		 3435 /*
3436 * 32-bit extent-start container, ee_block. We lower the maxbytes
3437 * by one fs block, so ee_len can cover the extent of maximum file
3438 * size
3439 */
3440 res = (1LL << 32) - 1;
cd2291a4 3441 res <<= blkbits;
cd2291a4
ES		 3442
3443 /* Sanity check against vm- & vfs- imposed limits */
3444 if (res > upper_limit)
3445 res = upper_limit;
3446
3447 return res;
3448}
ac27a0ec 3449
ac27a0ec 3450/*
cd2291a4 3451 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 3452 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3453 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 3454 */
f287a1a5 3455static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 3456{
5c93e8ec 3457 loff_t upper_limit, res = EXT4_NDIR_BLOCKS;
0fc1b451 3458 int meta_blocks;
5c93e8ec 3459 unsigned int ppb = 1 << (bits - 2);
75ca6ad4
RH		 3460
3461 /*
3462 * This is calculated to be the largest file size for a dense, block
0b8e58a1
AD		 3463 * mapped file such that the file's total number of 512-byte sectors,
3464 * including data and all indirect blocks, does not exceed (2^48 - 1).
3465 *
3466 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3467 * number of 512-byte sectors of the file.
0fc1b451 3468 */
72deb455 3469 if (!has_huge_files) {
0fc1b451 3470 /*
72deb455
CH		 3471 * !has_huge_files or implies that the inode i_block field
3472 * represents total file blocks in 2^32 512-byte sectors ==
3473 * size of vfs inode i_blocks * 8
0fc1b451
AK		 3474 */
3475 upper_limit = (1LL << 32) - 1;
3476
3477 /* total blocks in file system block size */
3478 upper_limit >>= (bits - 9);
3479
3480 } else {
8180a562
AK		 3481 /*
3482 * We use 48 bit ext4_inode i_blocks
3483 * With EXT4_HUGE_FILE_FL set the i_blocks
3484 * represent total number of blocks in
3485 * file system block size
3486 */
0fc1b451
AK		 3487 upper_limit = (1LL << 48) - 1;
3488
0fc1b451
AK		 3489 }
3490
5c93e8ec
ZY		 3491 /* Compute how many blocks we can address by block tree */
3492 res += ppb;
3493 res += ppb * ppb;
3494 res += ((loff_t)ppb) * ppb * ppb;
3495 /* Compute how many metadata blocks are needed */
3496 meta_blocks = 1;
3497 meta_blocks += 1 + ppb;
3498 meta_blocks += 1 + ppb + ppb * ppb;
3499 /* Does block tree limit file size? */
3500 if (res + meta_blocks <= upper_limit)
3501 goto check_lfs;
3502
3503 res = upper_limit;
3504 /* How many metadata blocks are needed for addressing upper_limit? */
3505 upper_limit -= EXT4_NDIR_BLOCKS;
0fc1b451
AK		 3506 /* indirect blocks */
3507 meta_blocks = 1;
5c93e8ec 3508 upper_limit -= ppb;
0fc1b451 3509 /* double indirect blocks */
5c93e8ec
ZY		 3510 if (upper_limit < ppb * ppb) {
3511 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb);
3512 res -= meta_blocks;
3513 goto check_lfs;
3514 }
3515 meta_blocks += 1 + ppb;
3516 upper_limit -= ppb * ppb;
3517 /* tripple indirect blocks for the rest */
3518 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb) +
3519 DIV_ROUND_UP_ULL(upper_limit, ppb*ppb);
3520 res -= meta_blocks;
3521check_lfs:
ac27a0ec 3522 res <<= bits;
0fc1b451
AK		 3523 if (res > MAX_LFS_FILESIZE)
3524 res = MAX_LFS_FILESIZE;
3525
5c93e8ec 3526 return res;
ac27a0ec
DK		 3527}
3528
617ba13b 3529static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 3530 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 3531{
617ba13b 3532 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 3533 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 3534 int has_super = 0;
3535
3536 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3537
e2b911c5 3538 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 3539 return logical_sb_block + nr + 1;
ac27a0ec 3540 bg = sbi->s_desc_per_block * nr;
617ba13b 3541 if (ext4_bg_has_super(sb, bg))
ac27a0ec 3542 has_super = 1;
0b8e58a1 3543
bd63f6b0
DW		 3544 /*
3545 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3546 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
3547 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3548 * compensate.
3549 */
3550 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 3551 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 3552 has_super++;
3553
617ba13b 3554 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 3555}
3556
c9de560d
AT		 3557/**
3558 * ext4_get_stripe_size: Get the stripe size.
3559 * @sbi: In memory super block info
3560 *
3561 * If we have specified it via mount option, then
3562 * use the mount option value. If the value specified at mount time is
3563 * greater than the blocks per group use the super block value.
3564 * If the super block value is greater than blocks per group return 0.
3565 * Allocator needs it be less than blocks per group.
3566 *
3567 */
3568static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3569{
3570 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3571 unsigned long stripe_width =
3572 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 3573 int ret;
c9de560d
AT		 3574
3575 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 3576 ret = sbi->s_stripe;
5469d7c3 3577 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 3578 ret = stripe_width;
5469d7c3 3579 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 3580 ret = stride;
3581 else
3582 ret = 0;
c9de560d 3583
3eb08658
DE		 3584 /*
3585 * If the stripe width is 1, this makes no sense and
3586 * we set it to 0 to turn off stripe handling code.
3587 */
3588 if (ret <= 1)
3589 ret = 0;
c9de560d 3590
3eb08658 3591 return ret;
c9de560d 3592}
ac27a0ec 3593
a13fb1a4
ES		 3594/*
3595 * Check whether this filesystem can be mounted based on
3596 * the features present and the RDONLY/RDWR mount requested.
3597 * Returns 1 if this filesystem can be mounted as requested,
3598 * 0 if it cannot be.
3599 */
25c6d98f 3600int ext4_feature_set_ok(struct super_block *sb, int readonly)
a13fb1a4 3601{
e2b911c5 3602 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 3603 ext4_msg(sb, KERN_ERR,
3604 "Couldn't mount because of "
3605 "unsupported optional features (%x)",
3606 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3607 ~EXT4_FEATURE_INCOMPAT_SUPP));
3608 return 0;
3609 }
3610
5298d4bf 3611#if !IS_ENABLED(CONFIG_UNICODE)
c83ad55e
GKB		 3612 if (ext4_has_feature_casefold(sb)) {
3613 ext4_msg(sb, KERN_ERR,
3614 "Filesystem with casefold feature cannot be "
3615 "mounted without CONFIG_UNICODE");
3616 return 0;
3617 }
3618#endif
3619
a13fb1a4
ES		 3620 if (readonly)
3621 return 1;
3622
e2b911c5 3623 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 3624 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 3625 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 3626 return 1;
3627 }
3628
a13fb1a4 3629 /* Check that feature set is OK for a read-write mount */
e2b911c5 3630 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 3631 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3632 "unsupported optional features (%x)",
3633 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3634 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3635 return 0;
3636 }
e2b911c5 3637 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 3638 ext4_msg(sb, KERN_ERR,
3639 "Can't support bigalloc feature without "
3640 "extents feature\n");
3641 return 0;
3642 }
7c319d32 3643
9db176bc 3644#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
d65d87a0
TT		 3645 if (!readonly && (ext4_has_feature_quota(sb) ||
3646 ext4_has_feature_project(sb))) {
7c319d32 3647 ext4_msg(sb, KERN_ERR,
d65d87a0 3648 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
689c958c
LX		 3649 return 0;
3650 }
7c319d32 3651#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 3652 return 1;
3653}
3654
66e61a9e
TT		 3655/*
3656 * This function is called once a day if we have errors logged
3657 * on the file system
3658 */
235699a8 3659static void print_daily_error_info(struct timer_list *t)
66e61a9e 3660{
235699a8
KC		 3661 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3662 struct super_block *sb = sbi->s_sb;
3663 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 3664
3665 if (es->s_error_count)
ae0f78de
TT		 3666 /* fsck newer than v1.41.13 is needed to clean this condition. */
3667 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 3668 le32_to_cpu(es->s_error_count));
3669 if (es->s_first_error_time) {
6a0678a7
AB		 3670 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3671 sb->s_id,
3672 ext4_get_tstamp(es, s_first_error_time),
66e61a9e
TT		 3673 (int) sizeof(es->s_first_error_func),
3674 es->s_first_error_func,
3675 le32_to_cpu(es->s_first_error_line));
3676 if (es->s_first_error_ino)
651e1c3b 3677 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3678 le32_to_cpu(es->s_first_error_ino));
3679 if (es->s_first_error_block)
651e1c3b 3680 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3681 le64_to_cpu(es->s_first_error_block));
651e1c3b 3682 printk(KERN_CONT "\n");
66e61a9e
TT		 3683 }
3684 if (es->s_last_error_time) {
6a0678a7
AB		 3685 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3686 sb->s_id,
3687 ext4_get_tstamp(es, s_last_error_time),
66e61a9e
TT		 3688 (int) sizeof(es->s_last_error_func),
3689 es->s_last_error_func,
3690 le32_to_cpu(es->s_last_error_line));
3691 if (es->s_last_error_ino)
651e1c3b 3692 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3693 le32_to_cpu(es->s_last_error_ino));
3694 if (es->s_last_error_block)
651e1c3b 3695 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3696 le64_to_cpu(es->s_last_error_block));
651e1c3b 3697 printk(KERN_CONT "\n");
66e61a9e
TT		 3698 }
3699 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3700}
3701
bfff6873
LC		 3702/* Find next suitable group and run ext4_init_inode_table */
3703static int ext4_run_li_request(struct ext4_li_request *elr)
3704{
3705 struct ext4_group_desc *gdp = NULL;
3d392b26
TT		 3706 struct super_block *sb = elr->lr_super;
3707 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3708 ext4_group_t group = elr->lr_next_group;
3d392b26 3709 unsigned int prefetch_ios = 0;
bfff6873 3710 int ret = 0;
4f3d1e45 3711 int nr = EXT4_SB(sb)->s_mb_prefetch;
39fec688 3712 u64 start_time;
bfff6873 3713
3d392b26 3714 if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
4f3d1e45
OM		 3715 elr->lr_next_group = ext4_mb_prefetch(sb, group, nr, &prefetch_ios);
3716 ext4_mb_prefetch_fini(sb, elr->lr_next_group, nr);
3717 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group, nr);
3d392b26
TT		 3718 if (group >= elr->lr_next_group) {
3719 ret = 1;
3720 if (elr->lr_first_not_zeroed != ngroups &&
3721 !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3722 elr->lr_next_group = elr->lr_first_not_zeroed;
3723 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3724 ret = 0;
3725 }
3726 }
3727 return ret;
3728 }
bfff6873 3729
3d392b26 3730 for (; group < ngroups; group++) {
bfff6873
LC		 3731 gdp = ext4_get_group_desc(sb, group, NULL);
3732 if (!gdp) {
3733 ret = 1;
3734 break;
3735 }
3736
3737 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3738 break;
3739 }
3740
7f511862 3741 if (group >= ngroups)
bfff6873
LC		 3742 ret = 1;
3743
3744 if (!ret) {
39fec688 3745 start_time = ktime_get_real_ns();
bfff6873
LC		 3746 ret = ext4_init_inode_table(sb, group,
3747 elr->lr_timeout ? 0 : 1);
3d392b26 3748 trace_ext4_lazy_itable_init(sb, group);
bfff6873 3749 if (elr->lr_timeout == 0) {
39fec688
SX		 3750 elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) *
3751 EXT4_SB(elr->lr_super)->s_li_wait_mult);
bfff6873
LC		 3752 }
3753 elr->lr_next_sched = jiffies + elr->lr_timeout;
3754 elr->lr_next_group = group + 1;
3755 }
bfff6873
LC		 3756 return ret;
3757}
3758
3759/*
3760 * Remove lr_request from the list_request and free the
4ed5c033 3761 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 3762 */
3763static void ext4_remove_li_request(struct ext4_li_request *elr)
3764{
bfff6873
LC		 3765 if (!elr)
3766 return;
3767
bfff6873 3768 list_del(&elr->lr_request);
3d392b26 3769 EXT4_SB(elr->lr_super)->s_li_request = NULL;
bfff6873
LC		 3770 kfree(elr);
3771}
3772
3773static void ext4_unregister_li_request(struct super_block *sb)
3774{
1bb933fb
LC		 3775 mutex_lock(&ext4_li_mtx);
3776 if (!ext4_li_info) {
3777 mutex_unlock(&ext4_li_mtx);
bfff6873 3778 return;
1bb933fb 3779 }
bfff6873
LC		 3780
3781 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3782 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3783 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3784 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3785}
3786
8f1f7453
ES		 3787static struct task_struct *ext4_lazyinit_task;
3788
bfff6873
LC		 3789/*
3790 * This is the function where ext4lazyinit thread lives. It walks
3791 * through the request list searching for next scheduled filesystem.
3792 * When such a fs is found, run the lazy initialization request
3793 * (ext4_rn_li_request) and keep track of the time spend in this
3794 * function. Based on that time we compute next schedule time of
3795 * the request. When walking through the list is complete, compute
3796 * next waking time and put itself into sleep.
3797 */
3798static int ext4_lazyinit_thread(void *arg)
3799{
c30365b9 3800 struct ext4_lazy_init *eli = arg;
bfff6873
LC		 3801 struct list_head *pos, *n;
3802 struct ext4_li_request *elr;
4ed5c033 3803 unsigned long next_wakeup, cur;
bfff6873
LC		 3804
3805 BUG_ON(NULL == eli);
3b575495 3806 set_freezable();
bfff6873 3807
bfff6873
LC		 3808cont_thread:
3809 while (true) {
3810 next_wakeup = MAX_JIFFY_OFFSET;
3811
3812 mutex_lock(&eli->li_list_mtx);
3813 if (list_empty(&eli->li_request_list)) {
3814 mutex_unlock(&eli->li_list_mtx);
3815 goto exit_thread;
3816 }
bfff6873 3817 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3818 int err = 0;
3819 int progress = 0;
bfff6873
LC		 3820 elr = list_entry(pos, struct ext4_li_request,
3821 lr_request);
3822
e22834f0
DM		 3823 if (time_before(jiffies, elr->lr_next_sched)) {
3824 if (time_before(elr->lr_next_sched, next_wakeup))
3825 next_wakeup = elr->lr_next_sched;
3826 continue;
3827 }
3828 if (down_read_trylock(&elr->lr_super->s_umount)) {
3829 if (sb_start_write_trylock(elr->lr_super)) {
3830 progress = 1;
3831 /*
3832 * We hold sb->s_umount, sb can not
3833 * be removed from the list, it is
3834 * now safe to drop li_list_mtx
3835 */
3836 mutex_unlock(&eli->li_list_mtx);
3837 err = ext4_run_li_request(elr);
3838 sb_end_write(elr->lr_super);
3839 mutex_lock(&eli->li_list_mtx);
3840 n = pos->next;
b2c78cd0 3841 }
e22834f0
DM		 3842 up_read((&elr->lr_super->s_umount));
3843 }
3844 /* error, remove the lazy_init job */
3845 if (err) {
3846 ext4_remove_li_request(elr);
3847 continue;
3848 }
3849 if (!progress) {
3850 elr->lr_next_sched = jiffies +
8032bf12 3851 get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
bfff6873 3852 }
bfff6873
LC		 3853 if (time_before(elr->lr_next_sched, next_wakeup))
3854 next_wakeup = elr->lr_next_sched;
3855 }
3856 mutex_unlock(&eli->li_list_mtx);
3857
a0acae0e 3858 try_to_freeze();
bfff6873 3859
4ed5c033
LC		 3860 cur = jiffies;
3861 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3862 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3863 cond_resched();
3864 continue;
3865 }
3866
4ed5c033
LC		 3867 schedule_timeout_interruptible(next_wakeup - cur);
3868
8f1f7453
ES		 3869 if (kthread_should_stop()) {
3870 ext4_clear_request_list();
3871 goto exit_thread;
3872 }
bfff6873
LC		 3873 }
3874
3875exit_thread:
3876 /*
3877 * It looks like the request list is empty, but we need
3878 * to check it under the li_list_mtx lock, to prevent any
3879 * additions into it, and of course we should lock ext4_li_mtx
3880 * to atomically free the list and ext4_li_info, because at
3881 * this point another ext4 filesystem could be registering
3882 * new one.
3883 */
3884 mutex_lock(&ext4_li_mtx);
3885 mutex_lock(&eli->li_list_mtx);
3886 if (!list_empty(&eli->li_request_list)) {
3887 mutex_unlock(&eli->li_list_mtx);
3888 mutex_unlock(&ext4_li_mtx);
3889 goto cont_thread;
3890 }
3891 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3892 kfree(ext4_li_info);
3893 ext4_li_info = NULL;
3894 mutex_unlock(&ext4_li_mtx);
3895
3896 return 0;
3897}
3898
3899static void ext4_clear_request_list(void)
3900{
3901 struct list_head *pos, *n;
3902 struct ext4_li_request *elr;
3903
3904 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3905 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3906 elr = list_entry(pos, struct ext4_li_request,
3907 lr_request);
3908 ext4_remove_li_request(elr);
3909 }
3910 mutex_unlock(&ext4_li_info->li_list_mtx);
3911}
3912
3913static int ext4_run_lazyinit_thread(void)
3914{
8f1f7453
ES		 3915 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3916 ext4_li_info, "ext4lazyinit");
3917 if (IS_ERR(ext4_lazyinit_task)) {
3918 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3919 ext4_clear_request_list();
bfff6873
LC		 3920 kfree(ext4_li_info);
3921 ext4_li_info = NULL;
92b97816 3922 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3923 "initialization thread\n",
3924 err);
3925 return err;
3926 }
3927 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3928 return 0;
3929}
3930
3931/*
3932 * Check whether it make sense to run itable init. thread or not.
3933 * If there is at least one uninitialized inode table, return
3934 * corresponding group number, else the loop goes through all
3935 * groups and return total number of groups.
3936 */
3937static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3938{
3939 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3940 struct ext4_group_desc *gdp = NULL;
3941
8844618d
TT		 3942 if (!ext4_has_group_desc_csum(sb))
3943 return ngroups;
3944
bfff6873
LC		 3945 for (group = 0; group < ngroups; group++) {
3946 gdp = ext4_get_group_desc(sb, group, NULL);
3947 if (!gdp)
3948 continue;
3949
50122847 3950 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3951 break;
3952 }
3953
3954 return group;
3955}
3956
3957static int ext4_li_info_new(void)
3958{
3959 struct ext4_lazy_init *eli = NULL;
3960
3961 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3962 if (!eli)
3963 return -ENOMEM;
3964
bfff6873
LC		 3965 INIT_LIST_HEAD(&eli->li_request_list);
3966 mutex_init(&eli->li_list_mtx);
3967
bfff6873
LC		 3968 eli->li_state |= EXT4_LAZYINIT_QUIT;
3969
3970 ext4_li_info = eli;
3971
3972 return 0;
3973}
3974
3975static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3976 ext4_group_t start)
3977{
bfff6873 3978 struct ext4_li_request *elr;
bfff6873
LC		 3979
3980 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3981 if (!elr)
3982 return NULL;
3983
3984 elr->lr_super = sb;
3d392b26 3985 elr->lr_first_not_zeroed = start;
21175ca4 3986 if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {
3d392b26
TT		 3987 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3988 elr->lr_next_group = start;
21175ca4
HS		 3989 } else {
3990 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3d392b26 3991 }
bfff6873
LC		 3992
3993 /*
3994 * Randomize first schedule time of the request to
3995 * spread the inode table initialization requests
3996 * better.
3997 */
8032bf12 3998 elr->lr_next_sched = jiffies + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
bfff6873
LC		 3999 return elr;
4000}
4001
7f511862
TT		 4002int ext4_register_li_request(struct super_block *sb,
4003 ext4_group_t first_not_zeroed)
bfff6873
LC		 4004{
4005 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 4006 struct ext4_li_request *elr = NULL;
49598e04 4007 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 4008 int ret = 0;
bfff6873 4009
7f511862 4010 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 4011 if (sbi->s_li_request != NULL) {
4012 /*
4013 * Reset timeout so it can be computed again, because
4014 * s_li_wait_mult might have changed.
4015 */
4016 sbi->s_li_request->lr_timeout = 0;
7f511862 4017 goto out;
51ce6511 4018 }
bfff6873 4019
426d15ad
JT		 4020 if (sb_rdonly(sb) ||
4021 (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
4022 (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE))))
7f511862 4023 goto out;
bfff6873
LC		 4024
4025 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 4026 if (!elr) {
4027 ret = -ENOMEM;
4028 goto out;
4029 }
bfff6873
LC		 4030
4031 if (NULL == ext4_li_info) {
4032 ret = ext4_li_info_new();
4033 if (ret)
4034 goto out;
4035 }
4036
4037 mutex_lock(&ext4_li_info->li_list_mtx);
4038 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
4039 mutex_unlock(&ext4_li_info->li_list_mtx);
4040
4041 sbi->s_li_request = elr;
46e4690b
TM		 4042 /*
4043 * set elr to NULL here since it has been inserted to
4044 * the request_list and the removal and free of it is
4045 * handled by ext4_clear_request_list from now on.
4046 */
4047 elr = NULL;
bfff6873
LC		 4048
4049 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
4050 ret = ext4_run_lazyinit_thread();
4051 if (ret)
4052 goto out;
4053 }
bfff6873 4054out:
beed5ecb
NK		 4055 mutex_unlock(&ext4_li_mtx);
4056 if (ret)
bfff6873 4057 kfree(elr);
bfff6873
LC		 4058 return ret;
4059}
4060
4061/*
4062 * We do not need to lock anything since this is called on
4063 * module unload.
4064 */
4065static void ext4_destroy_lazyinit_thread(void)
4066{
4067 /*
4068 * If thread exited earlier
4069 * there's nothing to be done.
4070 */
8f1f7453 4071 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 4072 return;
4073
8f1f7453 4074 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 4075}
4076
25ed6e8a
DW		 4077static int set_journal_csum_feature_set(struct super_block *sb)
4078{
4079 int ret = 1;
4080 int compat, incompat;
4081 struct ext4_sb_info *sbi = EXT4_SB(sb);
4082
9aa5d32b 4083 if (ext4_has_metadata_csum(sb)) {
db9ee220 4084 /* journal checksum v3 */
25ed6e8a 4085 compat = 0;
db9ee220 4086 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 4087 } else {
4088 /* journal checksum v1 */
4089 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
4090 incompat = 0;
4091 }
4092
feb8c6d3
DW		 4093 jbd2_journal_clear_features(sbi->s_journal,
4094 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
4095 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
4096 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 4097 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4098 ret = jbd2_journal_set_features(sbi->s_journal,
4099 compat, 0,
4100 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
4101 incompat);
4102 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
4103 ret = jbd2_journal_set_features(sbi->s_journal,
4104 compat, 0,
4105 incompat);
4106 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4107 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4108 } else {
feb8c6d3
DW		 4109 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4110 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 4111 }
4112
4113 return ret;
4114}
4115
952fc18e
TT		 4116/*
4117 * Note: calculating the overhead so we can be compatible with
4118 * historical BSD practice is quite difficult in the face of
4119 * clusters/bigalloc. This is because multiple metadata blocks from
4120 * different block group can end up in the same allocation cluster.
4121 * Calculating the exact overhead in the face of clustered allocation
4122 * requires either O(all block bitmaps) in memory or O(number of block
4123 * groups**2) in time. We will still calculate the superblock for
4124 * older file systems --- and if we come across with a bigalloc file
4125 * system with zero in s_overhead_clusters the estimate will be close to
4126 * correct especially for very large cluster sizes --- but for newer
4127 * file systems, it's better to calculate this figure once at mkfs
4128 * time, and store it in the superblock. If the superblock value is
4129 * present (even for non-bigalloc file systems), we will use it.
4130 */
4131static int count_overhead(struct super_block *sb, ext4_group_t grp,
4132 char *buf)
4133{
4134 struct ext4_sb_info *sbi = EXT4_SB(sb);
4135 struct ext4_group_desc *gdp;
4136 ext4_fsblk_t first_block, last_block, b;
4137 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4138 int s, j, count = 0;
10b01ee9 4139 int has_super = ext4_bg_has_super(sb, grp);
952fc18e 4140
e2b911c5 4141 if (!ext4_has_feature_bigalloc(sb))
10b01ee9
TT		 4142 return (has_super + ext4_bg_num_gdb(sb, grp) +
4143 (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) +
0548bbb8
TT		 4144 sbi->s_itb_per_group + 2);
4145
952fc18e
TT		 4146 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
4147 (grp * EXT4_BLOCKS_PER_GROUP(sb));
4148 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
4149 for (i = 0; i < ngroups; i++) {
4150 gdp = ext4_get_group_desc(sb, i, NULL);
4151 b = ext4_block_bitmap(sb, gdp);
4152 if (b >= first_block && b <= last_block) {
4153 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4154 count++;
4155 }
4156 b = ext4_inode_bitmap(sb, gdp);
4157 if (b >= first_block && b <= last_block) {
4158 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4159 count++;
4160 }
4161 b = ext4_inode_table(sb, gdp);
4162 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
4163 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
4164 int c = EXT4_B2C(sbi, b - first_block);
4165 ext4_set_bit(c, buf);
4166 count++;
4167 }
4168 if (i != grp)
4169 continue;
4170 s = 0;
4171 if (ext4_bg_has_super(sb, grp)) {
4172 ext4_set_bit(s++, buf);
4173 count++;
4174 }
c48ae41b
TT		 4175 j = ext4_bg_num_gdb(sb, grp);
4176 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
4177 ext4_error(sb, "Invalid number of block group "
4178 "descriptor blocks: %d", j);
4179 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 4180 }
c48ae41b
TT		 4181 count += j;
4182 for (; j > 0; j--)
4183 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 4184 }
4185 if (!count)
4186 return 0;
4187 return EXT4_CLUSTERS_PER_GROUP(sb) -
4188 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
4189}
4190
4191/*
4192 * Compute the overhead and stash it in sbi->s_overhead
4193 */
4194int ext4_calculate_overhead(struct super_block *sb)
4195{
4196 struct ext4_sb_info *sbi = EXT4_SB(sb);
4197 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 4198 struct inode *j_inode;
4199 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 4200 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4201 ext4_fsblk_t overhead = 0;
4fdb5543 4202 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 4203
952fc18e
TT		 4204 if (!buf)
4205 return -ENOMEM;
4206
4207 /*
4208 * Compute the overhead (FS structures). This is constant
4209 * for a given filesystem unless the number of block groups
4210 * changes so we cache the previous value until it does.
4211 */
4212
4213 /*
4214 * All of the blocks before first_data_block are overhead
4215 */
4216 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4217
4218 /*
4219 * Add the overhead found in each block group
4220 */
4221 for (i = 0; i < ngroups; i++) {
4222 int blks;
4223
4224 blks = count_overhead(sb, i, buf);
4225 overhead += blks;
4226 if (blks)
4227 memset(buf, 0, PAGE_SIZE);
4228 cond_resched();
4229 }
3c816ded
EW		 4230
4231 /*
4232 * Add the internal journal blocks whether the journal has been
4233 * loaded or not
4234 */
61ead714 4235 if (sbi->s_journal && !sbi->s_journal_bdev_file)
ede7dc7f 4236 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
f1eec3b0
RH		 4237 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
4238 /* j_inum for internal journal is non-zero */
3c816ded 4239 j_inode = ext4_get_journal_inode(sb, j_inum);
ee5c8071 4240 if (!IS_ERR(j_inode)) {
3c816ded
EW		 4241 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
4242 overhead += EXT4_NUM_B2C(sbi, j_blocks);
4243 iput(j_inode);
4244 } else {
4245 ext4_msg(sb, KERN_ERR, "can't get journal size");
4246 }
4247 }
952fc18e
TT		 4248 sbi->s_overhead = overhead;
4249 smp_wmb();
4250 free_page((unsigned long) buf);
4251 return 0;
4252}
4253
b5799018 4254static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 4255{
4256 ext4_fsblk_t resv_clusters;
b5799018 4257 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 4258
30fac0f7
JK		 4259 /*
4260 * There's no need to reserve anything when we aren't using extents.
4261 * The space estimates are exact, there are no unwritten extents,
4262 * hole punching doesn't need new metadata... This is needed especially
4263 * to keep ext2/3 backward compatibility.
4264 */
e2b911c5 4265 if (!ext4_has_feature_extents(sb))
b5799018 4266 return;
27dd4385
LC		 4267 /*
4268 * By default we reserve 2% or 4096 clusters, whichever is smaller.
4269 * This should cover the situations where we can not afford to run
4270 * out of space like for example punch hole, or converting
556615dc 4271 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 4272 * allocation would require 1, or 2 blocks, higher numbers are
4273 * very rare.
4274 */
b5799018
TT		 4275 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
4276 sbi->s_cluster_bits);
27dd4385
LC		 4277
4278 do_div(resv_clusters, 50);
4279 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
4280
b5799018 4281 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 4282}
4283
ca9b404f
RA		 4284static const char *ext4_quota_mode(struct super_block *sb)
4285{
4286#ifdef CONFIG_QUOTA
4287 if (!ext4_quota_capable(sb))
4288 return "none";
4289
4290 if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))
4291 return "journalled";
4292 else
4293 return "writeback";
4294#else
4295 return "disabled";
4296#endif
4297}
4298
188c299e
JK		 4299static void ext4_setup_csum_trigger(struct super_block *sb,
4300 enum ext4_journal_trigger_type type,
4301 void (*trigger)(
4302 struct jbd2_buffer_trigger_type *type,
4303 struct buffer_head *bh,
4304 void *mapped_data,
4305 size_t size))
4306{
4307 struct ext4_sb_info *sbi = EXT4_SB(sb);
4308
4309 sbi->s_journal_triggers[type].sb = sb;
4310 sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger;
4311}
4312
7edfd85b
LC		 4313static void ext4_free_sbi(struct ext4_sb_info *sbi)
4314{
4315 if (!sbi)
4316 return;
4317
4318 kfree(sbi->s_blockgroup_lock);
8012b866 4319 fs_put_dax(sbi->s_daxdev, NULL);
7edfd85b
LC		 4320 kfree(sbi);
4321}
4322
4323static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb)
4324{
4325 struct ext4_sb_info *sbi;
4326
4327 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
4328 if (!sbi)
4329 return NULL;
4330
8012b866
SR		 4331 sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off,
4332 NULL, NULL);
7edfd85b
LC		 4333
4334 sbi->s_blockgroup_lock =
4335 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
4336
4337 if (!sbi->s_blockgroup_lock)
4338 goto err_out;
4339
4340 sb->s_fs_info = sbi;
4341 sbi->s_sb = sb;
4342 return sbi;
4343err_out:
8012b866 4344 fs_put_dax(sbi->s_daxdev, NULL);
7edfd85b
LC		 4345 kfree(sbi);
4346 return NULL;
4347}
4348
5f6d662d
JY		 4349static void ext4_set_def_opts(struct super_block *sb,
4350 struct ext4_super_block *es)
4351{
4352 unsigned long def_mount_opts;
4353
4354 /* Set defaults before we parse the mount options */
4355 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
4356 set_opt(sb, INIT_INODE_TABLE);
4357 if (def_mount_opts & EXT4_DEFM_DEBUG)
4358 set_opt(sb, DEBUG);
4359 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
4360 set_opt(sb, GRPID);
4361 if (def_mount_opts & EXT4_DEFM_UID16)
4362 set_opt(sb, NO_UID32);
4363 /* xattr user namespace & acls are now defaulted on */
4364 set_opt(sb, XATTR_USER);
4365#ifdef CONFIG_EXT4_FS_POSIX_ACL
4366 set_opt(sb, POSIX_ACL);
4367#endif
4368 if (ext4_has_feature_fast_commit(sb))
4369 set_opt2(sb, JOURNAL_FAST_COMMIT);
4370 /* don't forget to enable journal_csum when metadata_csum is enabled. */
4371 if (ext4_has_metadata_csum(sb))
4372 set_opt(sb, JOURNAL_CHECKSUM);
4373
4374 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
4375 set_opt(sb, JOURNAL_DATA);
4376 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
4377 set_opt(sb, ORDERED_DATA);
4378 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
4379 set_opt(sb, WRITEBACK_DATA);
4380
4381 if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_PANIC)
4382 set_opt(sb, ERRORS_PANIC);
4383 else if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_CONTINUE)
4384 set_opt(sb, ERRORS_CONT);
4385 else
4386 set_opt(sb, ERRORS_RO);
4387 /* block_validity enabled by default; disable with noblock_validity */
4388 set_opt(sb, BLOCK_VALIDITY);
4389 if (def_mount_opts & EXT4_DEFM_DISCARD)
4390 set_opt(sb, DISCARD);
4391
4392 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
4393 set_opt(sb, BARRIER);
4394
4395 /*
4396 * enable delayed allocation by default
4397 * Use -o nodelalloc to turn it off
4398 */
4399 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
4400 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
4401 set_opt(sb, DELALLOC);
3df11e27 4402
e89fdcc4 4403 if (sb->s_blocksize <= PAGE_SIZE)
3df11e27 4404 set_opt(sb, DIOREAD_NOLOCK);
5f6d662d
JY		 4405}
4406
c8267c51 4407static int ext4_handle_clustersize(struct super_block *sb)
4a8557b0
JY		 4408{
4409 struct ext4_sb_info *sbi = EXT4_SB(sb);
4410 struct ext4_super_block *es = sbi->s_es;
4411 int clustersize;
4412
4413 /* Handle clustersize */
4414 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4415 if (ext4_has_feature_bigalloc(sb)) {
c8267c51 4416 if (clustersize < sb->s_blocksize) {
4a8557b0
JY		 4417 ext4_msg(sb, KERN_ERR,
4418 "cluster size (%d) smaller than "
c8267c51 4419 "block size (%lu)", clustersize, sb->s_blocksize);
4a8557b0
JY		 4420 return -EINVAL;
4421 }
4422 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4423 le32_to_cpu(es->s_log_block_size);
4a8557b0 4424 } else {
c8267c51 4425 if (clustersize != sb->s_blocksize) {
4a8557b0
JY		 4426 ext4_msg(sb, KERN_ERR,
4427 "fragment/cluster size (%d) != "
c8267c51 4428 "block size (%lu)", clustersize, sb->s_blocksize);
4a8557b0
JY		 4429 return -EINVAL;
4430 }
c8267c51 4431 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
4a8557b0
JY		 4432 ext4_msg(sb, KERN_ERR,
4433 "#blocks per group too big: %lu",
4434 sbi->s_blocks_per_group);
4435 return -EINVAL;
4436 }
4a8557b0
JY		 4437 sbi->s_cluster_bits = 0;
4438 }
40da553f
JK		 4439 sbi->s_clusters_per_group = le32_to_cpu(es->s_clusters_per_group);
4440 if (sbi->s_clusters_per_group > sb->s_blocksize * 8) {
4441 ext4_msg(sb, KERN_ERR, "#clusters per group too big: %lu",
4442 sbi->s_clusters_per_group);
4443 return -EINVAL;
4444 }
4445 if (sbi->s_blocks_per_group !=
4446 (sbi->s_clusters_per_group * (clustersize / sb->s_blocksize))) {
4447 ext4_msg(sb, KERN_ERR,
4448 "blocks per group (%lu) and clusters per group (%lu) inconsistent",
4449 sbi->s_blocks_per_group, sbi->s_clusters_per_group);
4450 return -EINVAL;
4451 }
c8267c51 4452 sbi->s_cluster_ratio = clustersize / sb->s_blocksize;
4a8557b0
JY		 4453
4454 /* Do we have standard group size of clustersize * 8 blocks ? */
4455 if (sbi->s_blocks_per_group == clustersize << 3)
4456 set_opt2(sb, STD_GROUP_SIZE);
4457
4458 return 0;
4459}
4460
f7314a67
JY		 4461static void ext4_fast_commit_init(struct super_block *sb)
4462{
4463 struct ext4_sb_info *sbi = EXT4_SB(sb);
4464
4465 /* Initialize fast commit stuff */
4466 atomic_set(&sbi->s_fc_subtid, 0);
4467 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
4468 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
4469 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
4470 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
4471 sbi->s_fc_bytes = 0;
4472 ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
4473 sbi->s_fc_ineligible_tid = 0;
4474 spin_lock_init(&sbi->s_fc_lock);
4475 memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
4476 sbi->s_fc_replay_state.fc_regions = NULL;
4477 sbi->s_fc_replay_state.fc_regions_size = 0;
4478 sbi->s_fc_replay_state.fc_regions_used = 0;
4479 sbi->s_fc_replay_state.fc_regions_valid = 0;
4480 sbi->s_fc_replay_state.fc_modified_inodes = NULL;
4481 sbi->s_fc_replay_state.fc_modified_inodes_size = 0;
4482 sbi->s_fc_replay_state.fc_modified_inodes_used = 0;
4483}
4484
0e495f7c 4485static int ext4_inode_info_init(struct super_block *sb,
c8267c51 4486 struct ext4_super_block *es)
0e495f7c
JY		 4487{
4488 struct ext4_sb_info *sbi = EXT4_SB(sb);
4489
4490 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4491 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4492 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4493 } else {
4494 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4495 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4496 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4497 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4498 sbi->s_first_ino);
4499 return -EINVAL;
4500 }
4501 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4502 (!is_power_of_2(sbi->s_inode_size)) ||
c8267c51 4503 (sbi->s_inode_size > sb->s_blocksize)) {
0e495f7c
JY		 4504 ext4_msg(sb, KERN_ERR,
4505 "unsupported inode size: %d",
4506 sbi->s_inode_size);
c8267c51 4507 ext4_msg(sb, KERN_ERR, "blocksize: %lu", sb->s_blocksize);
0e495f7c
JY		 4508 return -EINVAL;
4509 }
4510 /*
4511 * i_atime_extra is the last extra field available for
4512 * [acm]times in struct ext4_inode. Checking for that
4513 * field should suffice to ensure we have extra space
4514 * for all three.
4515 */
4516 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4517 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4518 sb->s_time_gran = 1;
4519 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4520 } else {
4521 sb->s_time_gran = NSEC_PER_SEC;
4522 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4523 }
4524 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4525 }
4526
4527 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4528 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4529 EXT4_GOOD_OLD_INODE_SIZE;
4530 if (ext4_has_feature_extra_isize(sb)) {
4531 unsigned v, max = (sbi->s_inode_size -
4532 EXT4_GOOD_OLD_INODE_SIZE);
4533
4534 v = le16_to_cpu(es->s_want_extra_isize);
4535 if (v > max) {
4536 ext4_msg(sb, KERN_ERR,
4537 "bad s_want_extra_isize: %d", v);
4538 return -EINVAL;
4539 }
4540 if (sbi->s_want_extra_isize < v)
4541 sbi->s_want_extra_isize = v;
4542
4543 v = le16_to_cpu(es->s_min_extra_isize);
4544 if (v > max) {
4545 ext4_msg(sb, KERN_ERR,
4546 "bad s_min_extra_isize: %d", v);
4547 return -EINVAL;
4548 }
4549 if (sbi->s_want_extra_isize < v)
4550 sbi->s_want_extra_isize = v;
4551 }
4552 }
4553
4554 return 0;
4555}
4556
39c135b0
JY		 4557#if IS_ENABLED(CONFIG_UNICODE)
4558static int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4559{
4560 const struct ext4_sb_encodings *encoding_info;
4561 struct unicode_map *encoding;
4562 __u16 encoding_flags = le16_to_cpu(es->s_encoding_flags);
4563
4564 if (!ext4_has_feature_casefold(sb) || sb->s_encoding)
4565 return 0;
4566
4567 encoding_info = ext4_sb_read_encoding(es);
4568 if (!encoding_info) {
4569 ext4_msg(sb, KERN_ERR,
4570 "Encoding requested by superblock is unknown");
4571 return -EINVAL;
4572 }
4573
4574 encoding = utf8_load(encoding_info->version);
4575 if (IS_ERR(encoding)) {
4576 ext4_msg(sb, KERN_ERR,
4577 "can't mount with superblock charset: %s-%u.%u.%u "
4578 "not supported by the kernel. flags: 0x%x.",
4579 encoding_info->name,
4580 unicode_major(encoding_info->version),
4581 unicode_minor(encoding_info->version),
4582 unicode_rev(encoding_info->version),
4583 encoding_flags);
4584 return -EINVAL;
4585 }
4586 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4587 "%s-%u.%u.%u with flags 0x%hx", encoding_info->name,
4588 unicode_major(encoding_info->version),
4589 unicode_minor(encoding_info->version),
4590 unicode_rev(encoding_info->version),
4591 encoding_flags);
4592
4593 sb->s_encoding = encoding;
4594 sb->s_encoding_flags = encoding_flags;
4595
4596 return 0;
4597}
4598#else
4599static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4600{
4601 return 0;
4602}
4603#endif
4604
b26458d1
JY		 4605static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es)
4606{
4607 struct ext4_sb_info *sbi = EXT4_SB(sb);
4608
4609 /* Warn if metadata_csum and gdt_csum are both set. */
4610 if (ext4_has_feature_metadata_csum(sb) &&
4611 ext4_has_feature_gdt_csum(sb))
4612 ext4_warning(sb, "metadata_csum and uninit_bg are "
4613 "redundant flags; please run fsck.");
4614
4615 /* Check for a known checksum algorithm */
4616 if (!ext4_verify_csum_type(sb, es)) {
4617 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4618 "unknown checksum algorithm.");
4619 return -EINVAL;
4620 }
4621 ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
4622 ext4_orphan_file_block_trigger);
4623
4624 /* Load the checksum driver */
4625 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
4626 if (IS_ERR(sbi->s_chksum_driver)) {
4627 int ret = PTR_ERR(sbi->s_chksum_driver);
4628 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
4629 sbi->s_chksum_driver = NULL;
4630 return ret;
4631 }
4632
4633 /* Check superblock checksum */
4634 if (!ext4_superblock_csum_verify(sb, es)) {
4635 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4636 "invalid superblock checksum. Run e2fsck?");
4637 return -EFSBADCRC;
4638 }
4639
4640 /* Precompute checksum seed for all metadata */
4641 if (ext4_has_feature_csum_seed(sb))
4642 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
4643 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
4644 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
4645 sizeof(es->s_uuid));
4646 return 0;
4647}
4648
d7f3542b
JY		 4649static int ext4_check_feature_compatibility(struct super_block *sb,
4650 struct ext4_super_block *es,
4651 int silent)
4652{
54902099
JY		 4653 struct ext4_sb_info *sbi = EXT4_SB(sb);
4654
d7f3542b
JY		 4655 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
4656 (ext4_has_compat_features(sb) ||
4657 ext4_has_ro_compat_features(sb) ||
4658 ext4_has_incompat_features(sb)))
4659 ext4_msg(sb, KERN_WARNING,
4660 "feature flags set on rev 0 fs, "
4661 "running e2fsck is recommended");
4662
4663 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4664 set_opt2(sb, HURD_COMPAT);
4665 if (ext4_has_feature_64bit(sb)) {
4666 ext4_msg(sb, KERN_ERR,
4667 "The Hurd can't support 64-bit file systems");
4668 return -EINVAL;
4669 }
4670
4671 /*
4672 * ea_inode feature uses l_i_version field which is not
4673 * available in HURD_COMPAT mode.
4674 */
4675 if (ext4_has_feature_ea_inode(sb)) {
4676 ext4_msg(sb, KERN_ERR,
4677 "ea_inode feature is not supported for Hurd");
4678 return -EINVAL;
4679 }
4680 }
4681
4682 if (IS_EXT2_SB(sb)) {
4683 if (ext2_feature_set_ok(sb))
4684 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4685 "using the ext4 subsystem");
4686 else {
4687 /*
4688 * If we're probing be silent, if this looks like
4689 * it's actually an ext[34] filesystem.
4690 */
4691 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4692 return -EINVAL;
4693 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4694 "to feature incompatibilities");
4695 return -EINVAL;
4696 }
4697 }
4698
4699 if (IS_EXT3_SB(sb)) {
4700 if (ext3_feature_set_ok(sb))
4701 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4702 "using the ext4 subsystem");
4703 else {
4704 /*
4705 * If we're probing be silent, if this looks like
4706 * it's actually an ext4 filesystem.
4707 */
4708 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4709 return -EINVAL;
4710 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4711 "to feature incompatibilities");
4712 return -EINVAL;
4713 }
4714 }
4715
4716 /*
4717 * Check feature flags regardless of the revision level, since we
4718 * previously didn't change the revision level when setting the flags,
4719 * so there is a chance incompat flags are set on a rev 0 filesystem.
4720 */
4721 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4722 return -EINVAL;
4723
54902099
JY		 4724 if (sbi->s_daxdev) {
4725 if (sb->s_blocksize == PAGE_SIZE)
4726 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4727 else
4728 ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
4729 }
4730
4731 if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
4732 if (ext4_has_feature_inline_data(sb)) {
4733 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4734 " that may contain inline data");
4735 return -EINVAL;
4736 }
4737 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
4738 ext4_msg(sb, KERN_ERR,
4739 "DAX unsupported by block device.");
4740 return -EINVAL;
4741 }
4742 }
4743
4744 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4745 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4746 es->s_encryption_level);
4747 return -EINVAL;
4748 }
4749
d7f3542b
JY		 4750 return 0;
4751}
4752
68e62439 4753static int ext4_check_geometry(struct super_block *sb,
bc62dbf9
JY		 4754 struct ext4_super_block *es)
4755{
4756 struct ext4_sb_info *sbi = EXT4_SB(sb);
4757 __u64 blocks_count;
269e9226
JY		 4758 int err;
4759
4760 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (sb->s_blocksize / 4)) {
4761 ext4_msg(sb, KERN_ERR,
4762 "Number of reserved GDT blocks insanely large: %d",
4763 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4764 return -EINVAL;
4765 }
4766 /*
4767 * Test whether we have more sectors than will fit in sector_t,
4768 * and whether the max offset is addressable by the page cache.
4769 */
4770 err = generic_check_addressable(sb->s_blocksize_bits,
4771 ext4_blocks_count(es));
4772 if (err) {
4773 ext4_msg(sb, KERN_ERR, "filesystem"
4774 " too large to mount safely on this system");
4775 return err;
4776 }
bc62dbf9
JY		 4777
4778 /* check blocks count against device size */
4779 blocks_count = sb_bdev_nr_blocks(sb);
4780 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4781 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4782 "exceeds size of device (%llu blocks)",
4783 ext4_blocks_count(es), blocks_count);
4784 return -EINVAL;
4785 }
4786
4787 /*
4788 * It makes no sense for the first data block to be beyond the end
4789 * of the filesystem.
4790 */
4791 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4792 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4793 "block %u is beyond end of filesystem (%llu)",
4794 le32_to_cpu(es->s_first_data_block),
4795 ext4_blocks_count(es));
4796 return -EINVAL;
4797 }
4798 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4799 (sbi->s_cluster_ratio == 1)) {
4800 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4801 "block is 0 with a 1k block and cluster size");
4802 return -EINVAL;
4803 }
4804
4805 blocks_count = (ext4_blocks_count(es) -
4806 le32_to_cpu(es->s_first_data_block) +
4807 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4808 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4809 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4810 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4811 "(block count %llu, first data block %u, "
4812 "blocks per group %lu)", blocks_count,
4813 ext4_blocks_count(es),
4814 le32_to_cpu(es->s_first_data_block),
4815 EXT4_BLOCKS_PER_GROUP(sb));
4816 return -EINVAL;
4817 }
4818 sbi->s_groups_count = blocks_count;
4819 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4820 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4821 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4822 le32_to_cpu(es->s_inodes_count)) {
4823 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4824 le32_to_cpu(es->s_inodes_count),
4825 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4826 return -EINVAL;
4827 }
4828
4829 return 0;
4830}
4831
a4e6a511
JY		 4832static int ext4_group_desc_init(struct super_block *sb,
4833 struct ext4_super_block *es,
4834 ext4_fsblk_t logical_sb_block,
4835 ext4_group_t *first_not_zeroed)
4836{
4837 struct ext4_sb_info *sbi = EXT4_SB(sb);
4838 unsigned int db_count;
4839 ext4_fsblk_t block;
a4e6a511
JY		 4840 int i;
4841
4842 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4843 EXT4_DESC_PER_BLOCK(sb);
4844 if (ext4_has_feature_meta_bg(sb)) {
4845 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4846 ext4_msg(sb, KERN_WARNING,
4847 "first meta block group too large: %u "
4848 "(group descriptor block count %u)",
4849 le32_to_cpu(es->s_first_meta_bg), db_count);
4850 return -EINVAL;
4851 }
4852 }
4853 rcu_assign_pointer(sbi->s_group_desc,
4854 kvmalloc_array(db_count,
4855 sizeof(struct buffer_head *),
4856 GFP_KERNEL));
4857 if (sbi->s_group_desc == NULL) {
4858 ext4_msg(sb, KERN_ERR, "not enough memory");
4859 return -ENOMEM;
4860 }
4861
4862 bgl_lock_init(sbi->s_blockgroup_lock);
4863
4864 /* Pre-read the descriptors into the buffer cache */
4865 for (i = 0; i < db_count; i++) {
4866 block = descriptor_loc(sb, logical_sb_block, i);
4867 ext4_sb_breadahead_unmovable(sb, block);
4868 }
4869
4870 for (i = 0; i < db_count; i++) {
4871 struct buffer_head *bh;
4872
4873 block = descriptor_loc(sb, logical_sb_block, i);
4874 bh = ext4_sb_bread_unmovable(sb, block);
4875 if (IS_ERR(bh)) {
4876 ext4_msg(sb, KERN_ERR,
4877 "can't read group descriptor %d", i);
4878 sbi->s_gdb_count = i;
172e344e 4879 return PTR_ERR(bh);
a4e6a511
JY		 4880 }
4881 rcu_read_lock();
4882 rcu_dereference(sbi->s_group_desc)[i] = bh;
4883 rcu_read_unlock();
4884 }
4885 sbi->s_gdb_count = db_count;
4886 if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) {
4887 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
172e344e 4888 return -EFSCORRUPTED;
a4e6a511 4889 }
172e344e 4890
a4e6a511 4891 return 0;
a4e6a511
JY		 4892}
4893
9c1dd22d
JY		 4894static int ext4_load_and_init_journal(struct super_block *sb,
4895 struct ext4_super_block *es,
4896 struct ext4_fs_context *ctx)
4897{
4898 struct ext4_sb_info *sbi = EXT4_SB(sb);
4899 int err;
4900
4901 err = ext4_load_journal(sb, es, ctx->journal_devnum);
4902 if (err)
4903 return err;
4904
4905 if (ext4_has_feature_64bit(sb) &&
4906 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4907 JBD2_FEATURE_INCOMPAT_64BIT)) {
4908 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4909 goto out;
4910 }
4911
4912 if (!set_journal_csum_feature_set(sb)) {
4913 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4914 "feature set");
4915 goto out;
4916 }
4917
4918 if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
4919 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4920 JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {
4921 ext4_msg(sb, KERN_ERR,
4922 "Failed to set fast commit journal feature");
4923 goto out;
4924 }
4925
4926 /* We have now updated the journal if required, so we can
4927 * validate the data journaling mode. */
4928 switch (test_opt(sb, DATA_FLAGS)) {
4929 case 0:
4930 /* No mode set, assume a default based on the journal
4931 * capabilities: ORDERED_DATA if the journal can
4932 * cope, else JOURNAL_DATA
4933 */
4934 if (jbd2_journal_check_available_features
4935 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4936 set_opt(sb, ORDERED_DATA);
4937 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4938 } else {
4939 set_opt(sb, JOURNAL_DATA);
4940 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4941 }
4942 break;
4943
4944 case EXT4_MOUNT_ORDERED_DATA:
4945 case EXT4_MOUNT_WRITEBACK_DATA:
4946 if (!jbd2_journal_check_available_features
4947 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4948 ext4_msg(sb, KERN_ERR, "Journal does not support "
4949 "requested data journaling mode");
4950 goto out;
4951 }
4952 break;
4953 default:
4954 break;
4955 }
4956
4957 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4958 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4959 ext4_msg(sb, KERN_ERR, "can't mount with "
4960 "journal_async_commit in data=ordered mode");
4961 goto out;
4962 }
4963
4964 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
4965
4966 sbi->s_journal->j_submit_inode_data_buffers =
4967 ext4_journal_submit_inode_data_buffers;
4968 sbi->s_journal->j_finish_inode_data_buffers =
4969 ext4_journal_finish_inode_data_buffers;
4970
4971 return 0;
4972
4973out:
bb15cea2
TT		 4974 /* flush s_sb_upd_work before destroying the journal. */
4975 flush_work(&sbi->s_sb_upd_work);
9c1dd22d
JY		 4976 jbd2_journal_destroy(sbi->s_journal);
4977 sbi->s_journal = NULL;
9f2a1d9f 4978 return -EINVAL;
9c1dd22d
JY		 4979}
4980
68e62439 4981static int ext4_check_journal_data_mode(struct super_block *sb)
a5991e53
JY		 4982{
4983 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4984 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with "
4985 "data=journal disables delayed allocation, "
4986 "dioread_nolock, O_DIRECT and fast_commit support!\n");
4987 /* can't mount with both data=journal and dioread_nolock. */
4988 clear_opt(sb, DIOREAD_NOLOCK);
4989 clear_opt2(sb, JOURNAL_FAST_COMMIT);
4990 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4991 ext4_msg(sb, KERN_ERR, "can't mount with "
4992 "both data=journal and delalloc");
4993 return -EINVAL;
4994 }
4995 if (test_opt(sb, DAX_ALWAYS)) {
4996 ext4_msg(sb, KERN_ERR, "can't mount with "
4997 "both data=journal and dax");
4998 return -EINVAL;
4999 }
5000 if (ext4_has_feature_encrypt(sb)) {
5001 ext4_msg(sb, KERN_WARNING,
5002 "encrypted files will use data=ordered "
5003 "instead of data journaling mode");
5004 }
5005 if (test_opt(sb, DELALLOC))
5006 clear_opt(sb, DELALLOC);
5007 } else {
5008 sb->s_iflags |= SB_I_CGROUPWB;
5009 }
5010
5011 return 0;
5012}
5013
a7a79c29
JY		 5014static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb,
5015 int silent)
ac27a0ec 5016{
7edfd85b 5017 struct ext4_sb_info *sbi = EXT4_SB(sb);
a7a79c29 5018 struct ext4_super_block *es;
70bbb3e0 5019 ext4_fsblk_t logical_sb_block;
ac27a0ec 5020 unsigned long offset = 0;
a7a79c29
JY		 5021 struct buffer_head *bh;
5022 int ret = -EINVAL;
4a8557b0 5023 int blocksize;
705895b6 5024
617ba13b 5025 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 5026 if (!blocksize) {
b31e1552 5027 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
a7a79c29 5028 return -EINVAL;
ac27a0ec
DK		 5029 }
5030
5031 /*
617ba13b 5032 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 5033 * block sizes. We need to calculate the offset from buffer start.
5034 */
617ba13b 5035 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
7edfd85b 5036 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
70bbb3e0 5037 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 5038 } else {
7edfd85b 5039 logical_sb_block = sbi->s_sb_block;
ac27a0ec
DK		 5040 }
5041
8394a6ab 5042 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5043 if (IS_ERR(bh)) {
b31e1552 5044 ext4_msg(sb, KERN_ERR, "unable to read superblock");
a7a79c29 5045 return PTR_ERR(bh);
ac27a0ec
DK		 5046 }
5047 /*
5048 * Note: s_es must be initialized as soon as possible because
617ba13b 5049 * some ext4 macro-instructions depend on its value
ac27a0ec 5050 */
2716b802 5051 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 5052 sbi->s_es = es;
5053 sb->s_magic = le16_to_cpu(es->s_magic);
a5fc5119
JY		 5054 if (sb->s_magic != EXT4_SUPER_MAGIC) {
5055 if (!silent)
5056 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
a7a79c29 5057 goto out;
a5fc5119
JY		 5058 }
5059
a7a79c29
JY		 5060 if (le32_to_cpu(es->s_log_block_size) >
5061 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5062 ext4_msg(sb, KERN_ERR,
5063 "Invalid log block size: %u",
5064 le32_to_cpu(es->s_log_block_size));
5065 goto out;
5066 }
5067 if (le32_to_cpu(es->s_log_cluster_size) >
5068 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5069 ext4_msg(sb, KERN_ERR,
5070 "Invalid log cluster size: %u",
5071 le32_to_cpu(es->s_log_cluster_size));
5072 goto out;
5073 }
5074
5075 blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
5076
5077 /*
5078 * If the default block size is not the same as the real block size,
5079 * we need to reload it.
5080 */
5081 if (sb->s_blocksize == blocksize) {
5082 *lsb = logical_sb_block;
5083 sbi->s_sbh = bh;
5084 return 0;
5085 }
5086
5087 /*
5088 * bh must be released before kill_bdev(), otherwise
5089 * it won't be freed and its page also. kill_bdev()
5090 * is called by sb_set_blocksize().
5091 */
5092 brelse(bh);
5093 /* Validate the filesystem blocksize */
5094 if (!sb_set_blocksize(sb, blocksize)) {
5095 ext4_msg(sb, KERN_ERR, "bad block size %d",
5096 blocksize);
5097 bh = NULL;
5098 goto out;
5099 }
5100
5101 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
5102 offset = do_div(logical_sb_block, blocksize);
5103 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5104 if (IS_ERR(bh)) {
5105 ext4_msg(sb, KERN_ERR, "Can't read superblock on 2nd try");
5106 ret = PTR_ERR(bh);
5107 bh = NULL;
5108 goto out;
5109 }
5110 es = (struct ext4_super_block *)(bh->b_data + offset);
5111 sbi->s_es = es;
5112 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
5113 ext4_msg(sb, KERN_ERR, "Magic mismatch, very weird!");
5114 goto out;
5115 }
5116 *lsb = logical_sb_block;
5117 sbi->s_sbh = bh;
5118 return 0;
5119out:
5120 brelse(bh);
5121 return ret;
5122}
5123
db9345d9
JY		 5124static void ext4_hash_info_init(struct super_block *sb)
5125{
5126 struct ext4_sb_info *sbi = EXT4_SB(sb);
5127 struct ext4_super_block *es = sbi->s_es;
5128 unsigned int i;
5129
5130 for (i = 0; i < 4; i++)
5131 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
5132
5133 sbi->s_def_hash_version = es->s_def_hash_version;
5134 if (ext4_has_feature_dir_index(sb)) {
5135 i = le32_to_cpu(es->s_flags);
5136 if (i & EXT2_FLAGS_UNSIGNED_HASH)
5137 sbi->s_hash_unsigned = 3;
5138 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
5139#ifdef __CHAR_UNSIGNED__
5140 if (!sb_rdonly(sb))
5141 es->s_flags |=
5142 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
5143 sbi->s_hash_unsigned = 3;
5144#else
5145 if (!sb_rdonly(sb))
5146 es->s_flags |=
5147 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
5148#endif
5149 }
5150 }
5151}
5152
107d2be9
JY		 5153static int ext4_block_group_meta_init(struct super_block *sb, int silent)
5154{
5155 struct ext4_sb_info *sbi = EXT4_SB(sb);
5156 struct ext4_super_block *es = sbi->s_es;
5157 int has_huge_files;
5158
5159 has_huge_files = ext4_has_feature_huge_file(sb);
5160 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
5161 has_huge_files);
5162 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
5163
5164 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
5165 if (ext4_has_feature_64bit(sb)) {
5166 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
5167 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
5168 !is_power_of_2(sbi->s_desc_size)) {
5169 ext4_msg(sb, KERN_ERR,
5170 "unsupported descriptor size %lu",
5171 sbi->s_desc_size);
5172 return -EINVAL;
5173 }
5174 } else
5175 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
5176
5177 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
5178 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
5179
5180 sbi->s_inodes_per_block = sb->s_blocksize / EXT4_INODE_SIZE(sb);
5181 if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) {
5182 if (!silent)
5183 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5184 return -EINVAL;
5185 }
5186 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
5187 sbi->s_inodes_per_group > sb->s_blocksize * 8) {
5188 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
5189 sbi->s_inodes_per_group);
5190 return -EINVAL;
5191 }
5192 sbi->s_itb_per_group = sbi->s_inodes_per_group /
5193 sbi->s_inodes_per_block;
5194 sbi->s_desc_per_block = sb->s_blocksize / EXT4_DESC_SIZE(sb);
5195 sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY;
5196 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
5197 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
5198
5199 return 0;
5200}
5201
a7a79c29
JY		 5202static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
5203{
5204 struct ext4_super_block *es = NULL;
5205 struct ext4_sb_info *sbi = EXT4_SB(sb);
a7a79c29
JY		 5206 ext4_fsblk_t logical_sb_block;
5207 struct inode *root;
107d2be9 5208 int needs_recovery;
d4fab7b2 5209 int err;
a7a79c29
JY		 5210 ext4_group_t first_not_zeroed;
5211 struct ext4_fs_context *ctx = fc->fs_private;
5212 int silent = fc->sb_flags & SB_SILENT;
5213
5214 /* Set defaults for the variables that will be set during parsing */
5215 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO))
5216 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5217
5218 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
5219 sbi->s_sectors_written_start =
5220 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);
5221
a7a79c29
JY		 5222 err = ext4_load_super(sb, &logical_sb_block, silent);
5223 if (err)
5224 goto out_fail;
5225
5226 es = sbi->s_es;
afc32f7e 5227 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 5228
b26458d1
JY		 5229 err = ext4_init_metadata_csum(sb, es);
5230 if (err)
a5fc5119 5231 goto failed_mount;
a9c47317 5232
5f6d662d 5233 ext4_set_def_opts(sb, es);
ac27a0ec 5234
08cefc7a
EB		 5235 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
5236 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 5237 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
5238 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
5239 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 5240
51ce6511
LC		 5241 /*
5242 * set default s_li_wait_mult for lazyinit, for the case there is
5243 * no mount option specified.
5244 */
5245 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
5246
d4fab7b2
TT		 5247 err = ext4_inode_info_init(sb, es);
5248 if (err)
0e495f7c 5249 goto failed_mount;
9803387c 5250
7edfd85b
LC		 5251 err = parse_apply_sb_mount_options(sb, ctx);
5252 if (err < 0)
5253 goto failed_mount;
5254
5a916be1 5255 sbi->s_def_mount_opt = sbi->s_mount_opt;
e3645d72 5256 sbi->s_def_mount_opt2 = sbi->s_mount_opt2;
7edfd85b
LC		 5257
5258 err = ext4_check_opt_consistency(fc, sb);
5259 if (err < 0)
5260 goto failed_mount;
5261
85456054 5262 ext4_apply_options(fc, sb);
ac27a0ec 5263
d4fab7b2
TT		 5264 err = ext4_encoding_init(sb, es);
5265 if (err)
39c135b0 5266 goto failed_mount;
c83ad55e 5267
d4fab7b2
TT		 5268 err = ext4_check_journal_data_mode(sb);
5269 if (err)
a5991e53 5270 goto failed_mount;
56889787 5271
1751e8a6
LT		 5272 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5273 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 5274
1ff20307
JL		 5275 /* i_version is always enabled now */
5276 sb->s_flags |= SB_I_VERSION;
5277
d4fab7b2
TT		 5278 err = ext4_check_feature_compatibility(sb, es, silent);
5279 if (err)
ac27a0ec 5280 goto failed_mount;
a13fb1a4 5281
d4fab7b2
TT		 5282 err = ext4_block_group_meta_init(sb, silent);
5283 if (err)
5b9554dc 5284 goto failed_mount;
5b9554dc 5285
db9345d9 5286 ext4_hash_info_init(sb);
ac27a0ec 5287
d4fab7b2
TT		 5288 err = ext4_handle_clustersize(sb);
5289 if (err)
4a8557b0 5290 goto failed_mount;
960fd856 5291
d4fab7b2
TT		 5292 err = ext4_check_geometry(sb, es);
5293 if (err)
0f2ddca6 5294 goto failed_mount;
0f2ddca6 5295
235699a8 5296 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
c92dc856 5297 spin_lock_init(&sbi->s_error_lock);
bb15cea2 5298 INIT_WORK(&sbi->s_sb_upd_work, update_super_work);
04496411 5299
172e344e
YB		 5300 err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed);
5301 if (err)
5302 goto failed_mount3;
5303
d4fab7b2
TT		 5304 err = ext4_es_register_shrinker(sbi);
5305 if (err)
ce7e010a 5306 goto failed_mount3;
ce7e010a 5307
c9de560d 5308 sbi->s_stripe = ext4_get_stripe_size(sbi);
c3defd99
KS		 5309 /*
5310 * It's hard to get stripe aligned blocks if stripe is not aligned with
5311 * cluster, just disable stripe and alert user to simpfy code and avoid
5312 * stripe aligned allocation which will rarely successes.
5313 */
5314 if (sbi->s_stripe > 0 && sbi->s_cluster_ratio > 1 &&
5315 sbi->s_stripe % sbi->s_cluster_ratio != 0) {
5316 ext4_msg(sb, KERN_WARNING,
5317 "stripe (%lu) is not aligned with cluster size (%u), "
5318 "stripe is disabled",
5319 sbi->s_stripe, sbi->s_cluster_ratio);
5320 sbi->s_stripe = 0;
5321 }
67a5da56 5322 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 5323
f9ae9cf5
TT		 5324 /*
5325 * set up enough so that it can read an inode
5326 */
f6e63f90 5327 sb->s_op = &ext4_sops;
617ba13b
MC		 5328 sb->s_export_op = &ext4_export_ops;
5329 sb->s_xattr = ext4_xattr_handlers;
643fa961 5330#ifdef CONFIG_FS_ENCRYPTION
a7550b30 5331 sb->s_cop = &ext4_cryptops;
ffcc4182 5332#endif
c93d8f88
EB		 5333#ifdef CONFIG_FS_VERITY
5334 sb->s_vop = &ext4_verityops;
5335#endif
ac27a0ec 5336#ifdef CONFIG_QUOTA
617ba13b 5337 sb->dq_op = &ext4_quota_operations;
e2b911c5 5338 if (ext4_has_feature_quota(sb))
1fa5efe3 5339 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 5340 else
5341 sb->s_qcop = &ext4_qctl_operations;
689c958c 5342 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 5343#endif
a4af51ce 5344 super_set_uuid(sb, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 5345
ac27a0ec 5346 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 5347 mutex_init(&sbi->s_orphan_lock);
ac27a0ec 5348
f7314a67 5349 ext4_fast_commit_init(sb);
aa75f4d3 5350
ac27a0ec
DK		 5351 sb->s_root = NULL;
5352
5353 needs_recovery = (es->s_last_orphan != 0 ||
02f310fc 5354 ext4_has_feature_orphan_present(sb) ||
e2b911c5 5355 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 5356
3b50d501
TT		 5357 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) {
5358 err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block));
5359 if (err)
50460fe8 5360 goto failed_mount3a;
3b50d501 5361 }
c5e06d10 5362
d4fab7b2 5363 err = -EINVAL;
ac27a0ec
DK		 5364 /*
5365 * The first inode we look at is the journal inode. Don't try
5366 * root first: it may be modified in the journal!
5367 */
e2b911c5 5368 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
9c1dd22d 5369 err = ext4_load_and_init_journal(sb, es, ctx);
4753d8a2 5370 if (err)
50460fe8 5371 goto failed_mount3a;
bc98a42c 5372 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 5373 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 5374 ext4_msg(sb, KERN_ERR, "required journal recovery "
5375 "suppressed and not mounted read-only");
43bd6f1b 5376 goto failed_mount3a;
ac27a0ec 5377 } else {
1e381f60 5378 /* Nojournal mode, all journal mount options are illegal */
89481b5f 5379 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1e381f60 5380 ext4_msg(sb, KERN_ERR, "can't mount with "
89481b5f 5381 "journal_async_commit, fs mounted w/o journal");
43bd6f1b 5382 goto failed_mount3a;
1e381f60 5383 }
89481b5f
BL		 5384
5385 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
1e381f60 5386 ext4_msg(sb, KERN_ERR, "can't mount with "
89481b5f 5387 "journal_checksum, fs mounted w/o journal");
43bd6f1b 5388 goto failed_mount3a;
1e381f60
DM		 5389 }
5390 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
5391 ext4_msg(sb, KERN_ERR, "can't mount with "
5392 "commit=%lu, fs mounted w/o journal",
5393 sbi->s_commit_interval / HZ);
43bd6f1b 5394 goto failed_mount3a;
1e381f60
DM		 5395 }
5396 if (EXT4_MOUNT_DATA_FLAGS &
5397 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
5398 ext4_msg(sb, KERN_ERR, "can't mount with "
5399 "data=, fs mounted w/o journal");
43bd6f1b 5400 goto failed_mount3a;
1e381f60 5401 }
50b29d8f 5402 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
1e381f60 5403 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 5404 clear_opt(sb, DATA_FLAGS);
995a3ed6 5405 clear_opt2(sb, JOURNAL_FAST_COMMIT);
0390131b
FM		 5406 sbi->s_journal = NULL;
5407 needs_recovery = 0;
ac27a0ec
DK		 5408 }
5409
cdb7ee4c
TE		 5410 if (!test_opt(sb, NO_MBCACHE)) {
5411 sbi->s_ea_block_cache = ext4_xattr_create_cache();
5412 if (!sbi->s_ea_block_cache) {
dec214d0 5413 ext4_msg(sb, KERN_ERR,
cdb7ee4c 5414 "Failed to create ea_block_cache");
d4fab7b2 5415 err = -EINVAL;
dec214d0
TE		 5416 goto failed_mount_wq;
5417 }
cdb7ee4c
TE		 5418
5419 if (ext4_has_feature_ea_inode(sb)) {
5420 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
5421 if (!sbi->s_ea_inode_cache) {
5422 ext4_msg(sb, KERN_ERR,
5423 "Failed to create ea_inode_cache");
d4fab7b2 5424 err = -EINVAL;
cdb7ee4c
TE		 5425 goto failed_mount_wq;
5426 }
5427 }
9c191f70
M		 5428 }
5429
952fc18e
TT		 5430 /*
5431 * Get the # of file system overhead blocks from the
5432 * superblock if present.
5433 */
85d825db
TT		 5434 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
5435 /* ignore the precalculated value if it is ridiculous */
5436 if (sbi->s_overhead > ext4_blocks_count(es))
5437 sbi->s_overhead = 0;
5438 /*
5439 * If the bigalloc feature is not enabled recalculating the
5440 * overhead doesn't take long, so we might as well just redo
5441 * it to make sure we are using the correct value.
5442 */
5443 if (!ext4_has_feature_bigalloc(sb))
5444 sbi->s_overhead = 0;
5445 if (sbi->s_overhead == 0) {
07aa2ea1
LC		 5446 err = ext4_calculate_overhead(sb);
5447 if (err)
952fc18e
TT		 5448 goto failed_mount_wq;
5449 }
5450
fd89d5f2
TH		 5451 /*
5452 * The maximum number of concurrent works can be high and
5453 * concurrency isn't really necessary. Limit it to 1.
5454 */
2e8fa54e
JK		 5455 EXT4_SB(sb)->rsv_conversion_wq =
5456 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
5457 if (!EXT4_SB(sb)->rsv_conversion_wq) {
5458 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
d4fab7b2 5459 err = -ENOMEM;
2e8fa54e
JK		 5460 goto failed_mount4;
5461 }
5462
ac27a0ec 5463 /*
dab291af 5464 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 5465 * so we can safely mount the rest of the filesystem now.
5466 */
5467
8a363970 5468 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 5469 if (IS_ERR(root)) {
b31e1552 5470 ext4_msg(sb, KERN_ERR, "get root inode failed");
d4fab7b2 5471 err = PTR_ERR(root);
32a9bb57 5472 root = NULL;
ac27a0ec
DK		 5473 goto failed_mount4;
5474 }
5475 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 5476 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 5477 iput(root);
d4fab7b2 5478 err = -EFSCORRUPTED;
ac27a0ec
DK		 5479 goto failed_mount4;
5480 }
b886ee3e 5481
04aa5f4e 5482 generic_set_sb_d_ops(sb);
48fde701 5483 sb->s_root = d_make_root(root);
1d1fe1ee 5484 if (!sb->s_root) {
b31e1552 5485 ext4_msg(sb, KERN_ERR, "get root dentry failed");
d4fab7b2 5486 err = -ENOMEM;
1d1fe1ee
DH		 5487 goto failed_mount4;
5488 }
ac27a0ec 5489
d4fab7b2
TT		 5490 err = ext4_setup_super(sb, es, sb_rdonly(sb));
5491 if (err == -EROFS) {
1751e8a6 5492 sb->s_flags |= SB_RDONLY;
d4fab7b2 5493 } else if (err)
c89128a0 5494 goto failed_mount4a;
ef7f3835 5495
b5799018 5496 ext4_set_resv_clusters(sb);
27dd4385 5497
0f5bde1d
JK		 5498 if (test_opt(sb, BLOCK_VALIDITY)) {
5499 err = ext4_setup_system_zone(sb);
5500 if (err) {
5501 ext4_msg(sb, KERN_ERR, "failed to initialize system "
5502 "zone (%d)", err);
5503 goto failed_mount4a;
5504 }
f9ae9cf5 5505 }
8016e29f 5506 ext4_fc_replay_cleanup(sb);
f9ae9cf5
TT		 5507
5508 ext4_ext_init(sb);
196e402a
HS		 5509
5510 /*
5511 * Enable optimize_scan if number of groups is > threshold. This can be
5512 * turned off by passing "mb_optimize_scan=0". This can also be
5513 * turned on forcefully by passing "mb_optimize_scan=1".
5514 */
27b38686
OM		 5515 if (!(ctx->spec & EXT4_SPEC_mb_optimize_scan)) {
5516 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD)
5517 set_opt2(sb, MB_OPTIMIZE_SCAN);
5518 else
5519 clear_opt2(sb, MB_OPTIMIZE_SCAN);
5520 }
196e402a 5521
f9ae9cf5
TT		 5522 err = ext4_mb_init(sb);
5523 if (err) {
5524 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
5525 err);
dcf2d804 5526 goto failed_mount5;
c2774d84
AK		 5527 }
5528
027f14f5
TT		 5529 /*
5530 * We can only set up the journal commit callback once
5531 * mballoc is initialized
5532 */
5533 if (sbi->s_journal)
5534 sbi->s_journal->j_commit_callback =
5535 ext4_journal_commit_callback;
5536
d5e72c4e
TT		 5537 err = ext4_percpu_param_init(sbi);
5538 if (err)
d5e03cbb 5539 goto failed_mount6;
d5e03cbb 5540
e2b911c5 5541 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 5542 if (!ext4_fill_flex_info(sb)) {
5543 ext4_msg(sb, KERN_ERR,
5544 "unable to initialize "
5545 "flex_bg meta info!");
d4fab7b2 5546 err = -ENOMEM;
d5e03cbb
TT		 5547 goto failed_mount6;
5548 }
5549
bfff6873
LC		 5550 err = ext4_register_li_request(sb, first_not_zeroed);
5551 if (err)
dcf2d804 5552 goto failed_mount6;
bfff6873 5553
b5799018 5554 err = ext4_register_sysfs(sb);
dcf2d804
TM		 5555 if (err)
5556 goto failed_mount7;
3197ebdb 5557
02f310fc
JK		 5558 err = ext4_init_orphan_info(sb);
5559 if (err)
5560 goto failed_mount8;
9b2ff357
JK		 5561#ifdef CONFIG_QUOTA
5562 /* Enable quota usage during mount. */
bc98a42c 5563 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 5564 err = ext4_enable_quotas(sb);
5565 if (err)
02f310fc 5566 goto failed_mount9;
9b2ff357
JK		 5567 }
5568#endif /* CONFIG_QUOTA */
5569
bc71726c 5570 /*
5571 * Save the original bdev mapping's wb_err value which could be
5572 * used to detect the metadata async write error.
5573 */
5574 spin_lock_init(&sbi->s_bdev_wb_lock);
9704a322
ZX		 5575 errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
5576 &sbi->s_bdev_wb_err);
617ba13b
MC		 5577 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
5578 ext4_orphan_cleanup(sb, es);
5579 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
9b6641dd
YB		 5580 /*
5581 * Update the checksum after updating free space/inode counters and
5582 * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect
5583 * checksum in the buffer cache until it is written out and
5584 * e2fsprogs programs trying to open a file system immediately
5585 * after it is mounted can fail.
5586 */
5587 ext4_superblock_csum_set(sb);
0390131b 5588 if (needs_recovery) {
b31e1552 5589 ext4_msg(sb, KERN_INFO, "recovery complete");
11215630
JK		 5590 err = ext4_mark_recovery_complete(sb, es);
5591 if (err)
d13f9963 5592 goto failed_mount10;
0390131b 5593 }
0390131b 5594
70200574
CH		 5595 if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev))
5596 ext4_msg(sb, KERN_WARNING,
5597 "mounting with \"discard\" option, but the device does not support discard");
79add3a3 5598
66e61a9e
TT		 5599 if (es->s_error_count)
5600 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 5601
efbed4dc
TT		 5602 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
5603 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
5604 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
5605 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
1cf006ed
DM		 5606 atomic_set(&sbi->s_warning_count, 0);
5607 atomic_set(&sbi->s_msg_count, 0);
efbed4dc 5608
ac27a0ec
DK		 5609 return 0;
5610
d13f9963 5611failed_mount10:
f3c1c42e 5612 ext4_quotas_off(sb, EXT4_MAXQUOTAS);
d13f9963 5613failed_mount9: __maybe_unused
02f310fc 5614 ext4_release_orphan_info(sb);
72ba7450 5615failed_mount8:
ebd173be 5616 ext4_unregister_sysfs(sb);
cb8d53d2 5617 kobject_put(&sbi->s_kobj);
dcf2d804
TM		 5618failed_mount7:
5619 ext4_unregister_li_request(sb);
5620failed_mount6:
f9ae9cf5 5621 ext4_mb_release(sb);
dcbf8758 5622 ext4_flex_groups_free(sbi);
1f79467c 5623 ext4_percpu_param_destroy(sbi);
00764937 5624failed_mount5:
f9ae9cf5
TT		 5625 ext4_ext_release(sb);
5626 ext4_release_system_zone(sb);
5627failed_mount4a:
94bf608a 5628 dput(sb->s_root);
32a9bb57 5629 sb->s_root = NULL;
94bf608a 5630failed_mount4:
b31e1552 5631 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 5632 if (EXT4_SB(sb)->rsv_conversion_wq)
5633 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 5634failed_mount_wq:
50c15df6
CX		 5635 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
5636 sbi->s_ea_inode_cache = NULL;
5637
5638 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
5639 sbi->s_ea_block_cache = NULL;
5640
0390131b 5641 if (sbi->s_journal) {
bb15cea2
TT		 5642 /* flush s_sb_upd_work before journal destroy. */
5643 flush_work(&sbi->s_sb_upd_work);
0390131b
FM		 5644 jbd2_journal_destroy(sbi->s_journal);
5645 sbi->s_journal = NULL;
5646 }
50460fe8 5647failed_mount3a:
d3922a77 5648 ext4_es_unregister_shrinker(sbi);
eb68d0e2 5649failed_mount3:
bb15cea2
TT		 5650 /* flush s_sb_upd_work before sbi destroy */
5651 flush_work(&sbi->s_sb_upd_work);
2a4ae3bc 5652 del_timer_sync(&sbi->s_err_report);
618f0031 5653 ext4_stop_mmpd(sbi);
a4e6a511 5654 ext4_group_desc_free(sbi);
ac27a0ec 5655failed_mount:
0441984a
DW		 5656 if (sbi->s_chksum_driver)
5657 crypto_free_shash(sbi->s_chksum_driver);
c83ad55e 5658
5298d4bf 5659#if IS_ENABLED(CONFIG_UNICODE)
f8f4acb6 5660 utf8_unload(sb->s_encoding);
c83ad55e
GKB		 5661#endif
5662
ac27a0ec 5663#ifdef CONFIG_QUOTA
856dd6c5 5664 for (unsigned int i = 0; i < EXT4_MAXQUOTAS; i++)
0ba33fac 5665 kfree(get_qf_name(sb, sbi, i));
ac27a0ec 5666#endif
ac4acb1f 5667 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
a7a79c29 5668 brelse(sbi->s_sbh);
61ead714
CB		 5669 if (sbi->s_journal_bdev_file) {
5670 invalidate_bdev(file_bdev(sbi->s_journal_bdev_file));
22650a99 5671 bdev_fput(sbi->s_journal_bdev_file);
1489dffd 5672 }
ac27a0ec 5673out_fail:
26fb5290 5674 invalidate_bdev(sb->s_bdev);
ac27a0ec 5675 sb->s_fs_info = NULL;
d4fab7b2 5676 return err;
ac27a0ec
DK		 5677}
5678
cebe85d5 5679static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
7edfd85b 5680{
cebe85d5 5681 struct ext4_fs_context *ctx = fc->fs_private;
7edfd85b 5682 struct ext4_sb_info *sbi;
7edfd85b 5683 const char *descr;
cebe85d5 5684 int ret;
7edfd85b
LC		 5685
5686 sbi = ext4_alloc_sbi(sb);
cebe85d5 5687 if (!sbi)
7c268d4c 5688 return -ENOMEM;
7edfd85b 5689
cebe85d5
LC		 5690 fc->s_fs_info = sbi;
5691
5692 /* Cleanup superblock name */
5693 strreplace(sb->s_id, '/', '!');
7edfd85b
LC		 5694
5695 sbi->s_sb_block = 1; /* Default super block location */
cebe85d5
LC		 5696 if (ctx->spec & EXT4_SPEC_s_sb_block)
5697 sbi->s_sb_block = ctx->s_sb_block;
7edfd85b 5698
960e0ab6 5699 ret = __ext4_fill_super(fc, sb);
7edfd85b
LC		 5700 if (ret < 0)
5701 goto free_sbi;
5702
cebe85d5 5703 if (sbi->s_journal) {
7edfd85b
LC		 5704 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
5705 descr = " journalled data mode";
5706 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
5707 descr = " ordered data mode";
5708 else
5709 descr = " writeback data mode";
5710 } else
5711 descr = "out journal";
5712
5713 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
6dcc98fb
TT		 5714 ext4_msg(sb, KERN_INFO, "mounted filesystem %pU %s with%s. "
5715 "Quota mode: %s.", &sb->s_uuid,
5716 sb_rdonly(sb) ? "ro" : "r/w", descr,
bb0fbc78 5717 ext4_quota_mode(sb));
cebe85d5 5718
eb705421 5719 /* Update the s_overhead_clusters if necessary */
827891a3 5720 ext4_update_overhead(sb, false);
7edfd85b 5721 return 0;
cebe85d5 5722
7edfd85b
LC		 5723free_sbi:
5724 ext4_free_sbi(sbi);
cebe85d5 5725 fc->s_fs_info = NULL;
7edfd85b
LC		 5726 return ret;
5727}
5728
cebe85d5
LC		 5729static int ext4_get_tree(struct fs_context *fc)
5730{
5731 return get_tree_bdev(fc, ext4_fill_super);
5732}
5733
ac27a0ec
DK		 5734/*
5735 * Setup any per-fs journal parameters now. We'll do this both on
5736 * initial mount, once the journal has been initialised but before we've
5737 * done any recovery; and again on any subsequent remount.
5738 */
617ba13b 5739static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 5740{
617ba13b 5741 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5742
30773840
TT		 5743 journal->j_commit_interval = sbi->s_commit_interval;
5744 journal->j_min_batch_time = sbi->s_min_batch_time;
5745 journal->j_max_batch_time = sbi->s_max_batch_time;
6866d7b3 5746 ext4_fc_init(sb, journal);
ac27a0ec 5747
a931da6a 5748 write_lock(&journal->j_state_lock);
ac27a0ec 5749 if (test_opt(sb, BARRIER))
dab291af 5750 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 5751 else
dab291af 5752 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 5753 if (test_opt(sb, DATA_ERR_ABORT))
5754 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
5755 else
5756 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
72945058
ZY		 5757 /*
5758 * Always enable journal cycle record option, letting the journal
5759 * records log transactions continuously between each mount.
5760 */
5761 journal->j_flags |= JBD2_CYCLE_RECORD;
a931da6a 5762 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 5763}
5764
c6cb7e77
EW		 5765static struct inode *ext4_get_journal_inode(struct super_block *sb,
5766 unsigned int journal_inum)
ac27a0ec
DK		 5767{
5768 struct inode *journal_inode;
ac27a0ec 5769
c6cb7e77
EW		 5770 /*
5771 * Test for the existence of a valid inode on disk. Bad things
5772 * happen if we iget() an unused inode, as the subsequent iput()
5773 * will try to delete it.
5774 */
8a363970 5775 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 5776 if (IS_ERR(journal_inode)) {
b31e1552 5777 ext4_msg(sb, KERN_ERR, "no journal found");
ee5c8071 5778 return ERR_CAST(journal_inode);
ac27a0ec
DK		 5779 }
5780 if (!journal_inode->i_nlink) {
5781 make_bad_inode(journal_inode);
5782 iput(journal_inode);
b31e1552 5783 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ee5c8071 5784 return ERR_PTR(-EFSCORRUPTED);
ac27a0ec 5785 }
105c78e1 5786 if (!S_ISREG(journal_inode->i_mode) || IS_ENCRYPTED(journal_inode)) {
b31e1552 5787 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec 5788 iput(journal_inode);
ee5c8071 5789 return ERR_PTR(-EFSCORRUPTED);
ac27a0ec 5790 }
bc74e6a3
ZY		 5791
5792 ext4_debug("Journal inode found at %p: %lld bytes\n",
5793 journal_inode, journal_inode->i_size);
c6cb7e77
EW		 5794 return journal_inode;
5795}
5796
62913ae9
TT		 5797static int ext4_journal_bmap(journal_t *journal, sector_t *block)
5798{
5799 struct ext4_map_blocks map;
5800 int ret;
5801
5802 if (journal->j_inode == NULL)
5803 return 0;
5804
5805 map.m_lblk = *block;
5806 map.m_len = 1;
5807 ret = ext4_map_blocks(NULL, journal->j_inode, &map, 0);
5808 if (ret <= 0) {
5809 ext4_msg(journal->j_inode->i_sb, KERN_CRIT,
5810 "journal bmap failed: block %llu ret %d\n",
5811 *block, ret);
5812 jbd2_journal_abort(journal, ret ? ret : -EIO);
5813 return ret;
5814 }
5815 *block = map.m_pblk;
5816 return 0;
5817}
5818
ee5c8071
ZY		 5819static journal_t *ext4_open_inode_journal(struct super_block *sb,
5820 unsigned int journal_inum)
c6cb7e77
EW		 5821{
5822 struct inode *journal_inode;
5823 journal_t *journal;
5824
c6cb7e77 5825 journal_inode = ext4_get_journal_inode(sb, journal_inum);
ee5c8071
ZY		 5826 if (IS_ERR(journal_inode))
5827 return ERR_CAST(journal_inode);
ac27a0ec 5828
dab291af 5829 journal = jbd2_journal_init_inode(journal_inode);
8e6cf5fb 5830 if (IS_ERR(journal)) {
b31e1552 5831 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec 5832 iput(journal_inode);
ee5c8071 5833 return ERR_CAST(journal);
ac27a0ec
DK		 5834 }
5835 journal->j_private = sb;
62913ae9 5836 journal->j_bmap = ext4_journal_bmap;
617ba13b 5837 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 5838 return journal;
5839}
5840
61ead714 5841static struct file *ext4_get_journal_blkdev(struct super_block *sb,
bc74e6a3
ZY		 5842 dev_t j_dev, ext4_fsblk_t *j_start,
5843 ext4_fsblk_t *j_len)
ac27a0ec 5844{
2b2d6d01 5845 struct buffer_head *bh;
bc74e6a3 5846 struct block_device *bdev;
61ead714 5847 struct file *bdev_file;
ac27a0ec 5848 int hblock, blocksize;
617ba13b 5849 ext4_fsblk_t sb_block;
ac27a0ec 5850 unsigned long offset;
2b2d6d01 5851 struct ext4_super_block *es;
ee5c8071 5852 int errno;
0390131b 5853
61ead714 5854 bdev_file = bdev_file_open_by_dev(j_dev,
afde134b
JK		 5855 BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,
5856 sb, &fs_holder_ops);
61ead714 5857 if (IS_ERR(bdev_file)) {
bc74e6a3
ZY		 5858 ext4_msg(sb, KERN_ERR,
5859 "failed to open journal device unknown-block(%u,%u) %ld",
61ead714
CB		 5860 MAJOR(j_dev), MINOR(j_dev), PTR_ERR(bdev_file));
5861 return bdev_file;
bc74e6a3 5862 }
ac27a0ec 5863
61ead714 5864 bdev = file_bdev(bdev_file);
ac27a0ec 5865 blocksize = sb->s_blocksize;
e1defc4f 5866 hblock = bdev_logical_block_size(bdev);
ac27a0ec 5867 if (blocksize < hblock) {
b31e1552
ES		 5868 ext4_msg(sb, KERN_ERR,
5869 "blocksize too small for journal device");
ee5c8071 5870 errno = -EINVAL;
ac27a0ec
DK		 5871 goto out_bdev;
5872 }
5873
617ba13b
MC		 5874 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5875 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec 5876 set_blocksize(bdev, blocksize);
bc74e6a3
ZY		 5877 bh = __bread(bdev, sb_block, blocksize);
5878 if (!bh) {
b31e1552
ES		 5879 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5880 "external journal");
ee5c8071 5881 errno = -EINVAL;
ac27a0ec
DK		 5882 goto out_bdev;
5883 }
5884
2716b802 5885 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 5886 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 5887 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 5888 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
bc74e6a3 5889 ext4_msg(sb, KERN_ERR, "external journal has bad superblock");
ee5c8071 5890 errno = -EFSCORRUPTED;
bc74e6a3 5891 goto out_bh;
ac27a0ec
DK		 5892 }
5893
df4763be
DW		 5894 if ((le32_to_cpu(es->s_feature_ro_compat) &
5895 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5896 es->s_checksum != ext4_superblock_csum(sb, es)) {
bc74e6a3 5897 ext4_msg(sb, KERN_ERR, "external journal has corrupt superblock");
ee5c8071 5898 errno = -EFSCORRUPTED;
bc74e6a3 5899 goto out_bh;
df4763be
DW		 5900 }
5901
617ba13b 5902 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 5903 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ee5c8071 5904 errno = -EFSCORRUPTED;
bc74e6a3 5905 goto out_bh;
ac27a0ec
DK		 5906 }
5907
bc74e6a3
ZY		 5908 *j_start = sb_block + 1;
5909 *j_len = ext4_blocks_count(es);
5910 brelse(bh);
61ead714 5911 return bdev_file;
ac27a0ec 5912
bc74e6a3
ZY		 5913out_bh:
5914 brelse(bh);
5915out_bdev:
22650a99 5916 bdev_fput(bdev_file);
ee5c8071 5917 return ERR_PTR(errno);
bc74e6a3
ZY		 5918}
5919
ee5c8071
ZY		 5920static journal_t *ext4_open_dev_journal(struct super_block *sb,
5921 dev_t j_dev)
bc74e6a3
ZY		 5922{
5923 journal_t *journal;
5924 ext4_fsblk_t j_start;
5925 ext4_fsblk_t j_len;
61ead714 5926 struct file *bdev_file;
ee5c8071 5927 int errno = 0;
bc74e6a3 5928
61ead714
CB		 5929 bdev_file = ext4_get_journal_blkdev(sb, j_dev, &j_start, &j_len);
5930 if (IS_ERR(bdev_file))
5931 return ERR_CAST(bdev_file);
bc74e6a3 5932
61ead714 5933 journal = jbd2_journal_init_dev(file_bdev(bdev_file), sb->s_bdev, j_start,
bc74e6a3 5934 j_len, sb->s_blocksize);
8e6cf5fb 5935 if (IS_ERR(journal)) {
b31e1552 5936 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ee5c8071 5937 errno = PTR_ERR(journal);
ac27a0ec
DK		 5938 goto out_bdev;
5939 }
ac27a0ec 5940 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 5941 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5942 "user (unsupported) - %d",
ac27a0ec 5943 be32_to_cpu(journal->j_superblock->s_nr_users));
ee5c8071 5944 errno = -EINVAL;
ac27a0ec
DK		 5945 goto out_journal;
5946 }
bc74e6a3 5947 journal->j_private = sb;
61ead714 5948 EXT4_SB(sb)->s_journal_bdev_file = bdev_file;
617ba13b 5949 ext4_init_journal_params(sb, journal);
ac27a0ec 5950 return journal;
0b8e58a1 5951
ac27a0ec 5952out_journal:
dab291af 5953 jbd2_journal_destroy(journal);
ac27a0ec 5954out_bdev:
22650a99 5955 bdev_fput(bdev_file);
ee5c8071 5956 return ERR_PTR(errno);
ac27a0ec
DK		 5957}
5958
617ba13b
MC		 5959static int ext4_load_journal(struct super_block *sb,
5960 struct ext4_super_block *es,
ac27a0ec
DK		 5961 unsigned long journal_devnum)
5962{
5963 journal_t *journal;
5964 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5965 dev_t journal_dev;
5966 int err = 0;
5967 int really_read_only;
273108fa 5968 int journal_dev_ro;
ac27a0ec 5969
11215630
JK		 5970 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5971 return -EFSCORRUPTED;
0390131b 5972
ac27a0ec
DK		 5973 if (journal_devnum &&
5974 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 5975 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5976 "numbers have changed");
ac27a0ec
DK		 5977 journal_dev = new_decode_dev(journal_devnum);
5978 } else
5979 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5980
273108fa
LC		 5981 if (journal_inum && journal_dev) {
5982 ext4_msg(sb, KERN_ERR,
5983 "filesystem has both journal inode and journal device!");
5984 return -EINVAL;
5985 }
5986
5987 if (journal_inum) {
ee5c8071
ZY		 5988 journal = ext4_open_inode_journal(sb, journal_inum);
5989 if (IS_ERR(journal))
5990 return PTR_ERR(journal);
273108fa 5991 } else {
ee5c8071
ZY		 5992 journal = ext4_open_dev_journal(sb, journal_dev);
5993 if (IS_ERR(journal))
5994 return PTR_ERR(journal);
273108fa
LC		 5995 }
5996
5997 journal_dev_ro = bdev_read_only(journal->j_dev);
5998 really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5999
6000 if (journal_dev_ro && !sb_rdonly(sb)) {
6001 ext4_msg(sb, KERN_ERR,
6002 "journal device read-only, try mounting with '-o ro'");
6003 err = -EROFS;
6004 goto err_out;
6005 }
ac27a0ec
DK		 6006
6007 /*
6008 * Are we loading a blank journal or performing recovery after a
6009 * crash? For recovery, we need to check in advance whether we
6010 * can get read-write access to the device.
6011 */
e2b911c5 6012 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 6013 if (sb_rdonly(sb)) {
b31e1552
ES		 6014 ext4_msg(sb, KERN_INFO, "INFO: recovery "
6015 "required on readonly filesystem");
ac27a0ec 6016 if (really_read_only) {
b31e1552 6017 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 6018 "unavailable, cannot proceed "
6019 "(try mounting with noload)");
273108fa
LC		 6020 err = -EROFS;
6021 goto err_out;
ac27a0ec 6022 }
b31e1552
ES		 6023 ext4_msg(sb, KERN_INFO, "write access will "
6024 "be enabled during recovery");
ac27a0ec
DK		 6025 }
6026 }
6027
90576c0b 6028 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 6029 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 6030
e2b911c5 6031 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 6032 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 6033 if (!err) {
6034 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
2ef6c32a
TT		 6035 __le16 orig_state;
6036 bool changed = false;
eee00237 6037
1c13d5c0
TT		 6038 if (save)
6039 memcpy(save, ((char *) es) +
6040 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 6041 err = jbd2_journal_load(journal);
2ef6c32a
TT		 6042 if (save && memcmp(((char *) es) + EXT4_S_ERR_START,
6043 save, EXT4_S_ERR_LEN)) {
1c13d5c0
TT		 6044 memcpy(((char *) es) + EXT4_S_ERR_START,
6045 save, EXT4_S_ERR_LEN);
2ef6c32a
TT		 6046 changed = true;
6047 }
1c13d5c0 6048 kfree(save);
2ef6c32a 6049 orig_state = es->s_state;
eee00237
YB		 6050 es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state &
6051 EXT4_ERROR_FS);
2ef6c32a
TT		 6052 if (orig_state != es->s_state)
6053 changed = true;
eee00237 6054 /* Write out restored error information to the superblock */
2ef6c32a 6055 if (changed && !really_read_only) {
eee00237
YB		 6056 int err2;
6057 err2 = ext4_commit_super(sb);
6058 err = err ? : err2;
6059 }
1c13d5c0 6060 }
ac27a0ec
DK		 6061
6062 if (err) {
b31e1552 6063 ext4_msg(sb, KERN_ERR, "error loading journal");
273108fa 6064 goto err_out;
ac27a0ec
DK		 6065 }
6066
617ba13b 6067 EXT4_SB(sb)->s_journal = journal;
11215630
JK		 6068 err = ext4_clear_journal_err(sb, es);
6069 if (err) {
6070 EXT4_SB(sb)->s_journal = NULL;
6071 jbd2_journal_destroy(journal);
6072 return err;
6073 }
ac27a0ec 6074
c41303ce 6075 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 6076 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
6077 es->s_journal_dev = cpu_to_le32(journal_devnum);
3039d8b8
BL		 6078 ext4_commit_super(sb);
6079 }
6080 if (!really_read_only && journal_inum &&
6081 journal_inum != le32_to_cpu(es->s_journal_inum)) {
6082 es->s_journal_inum = cpu_to_le32(journal_inum);
4392fbc4 6083 ext4_commit_super(sb);
ac27a0ec
DK		 6084 }
6085
6086 return 0;
273108fa
LC		 6087
6088err_out:
6089 jbd2_journal_destroy(journal);
6090 return err;
ac27a0ec
DK		 6091}
6092
2d01ddc8
JK		 6093/* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
6094static void ext4_update_super(struct super_block *sb)
ac27a0ec 6095{
c92dc856 6096 struct ext4_sb_info *sbi = EXT4_SB(sb);
e92ad03f
JK		 6097 struct ext4_super_block *es = sbi->s_es;
6098 struct buffer_head *sbh = sbi->s_sbh;
a17712c8 6099
05c2c00f 6100 lock_buffer(sbh);
71290b36
TT		 6101 /*
6102 * If the file system is mounted read-only, don't update the
6103 * superblock write time. This avoids updating the superblock
6104 * write time when we are mounting the root file system
6105 * read/only but we need to replay the journal; at that point,
6106 * for people who are east of GMT and who make their clock
6107 * tick in localtime for Windows bug-for-bug compatibility,
6108 * the clock is set in the future, and this will cause e2fsck
6109 * to complain and force a full file system check.
6110 */
d5d020b3 6111 if (!sb_rdonly(sb))
6a0678a7 6112 ext4_update_tstamp(es, s_wtime);
8446fe92 6113 es->s_kbytes_written =
0bc9bc1d 6114 cpu_to_le64(sbi->s_kbytes_written +
8446fe92 6115 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
0bc9bc1d 6116 sbi->s_sectors_written_start) >> 1));
e92ad03f 6117 if (percpu_counter_initialized(&sbi->s_freeclusters_counter))
d5e03cbb 6118 ext4_free_blocks_count_set(es,
e92ad03f
JK		 6119 EXT4_C2B(sbi, percpu_counter_sum_positive(
6120 &sbi->s_freeclusters_counter)));
6121 if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
d5e03cbb
TT		 6122 es->s_free_inodes_count =
6123 cpu_to_le32(percpu_counter_sum_positive(
e92ad03f 6124 &sbi->s_freeinodes_counter));
c92dc856
JK		 6125 /* Copy error information to the on-disk superblock */
6126 spin_lock(&sbi->s_error_lock);
6127 if (sbi->s_add_error_count > 0) {
6128 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6129 if (!es->s_first_error_time && !es->s_first_error_time_hi) {
6130 __ext4_update_tstamp(&es->s_first_error_time,
6131 &es->s_first_error_time_hi,
6132 sbi->s_first_error_time);
6133 strncpy(es->s_first_error_func, sbi->s_first_error_func,
6134 sizeof(es->s_first_error_func));
6135 es->s_first_error_line =
6136 cpu_to_le32(sbi->s_first_error_line);
6137 es->s_first_error_ino =
6138 cpu_to_le32(sbi->s_first_error_ino);
6139 es->s_first_error_block =
6140 cpu_to_le64(sbi->s_first_error_block);
6141 es->s_first_error_errcode =
6142 ext4_errno_to_code(sbi->s_first_error_code);
6143 }
6144 __ext4_update_tstamp(&es->s_last_error_time,
6145 &es->s_last_error_time_hi,
6146 sbi->s_last_error_time);
6147 strncpy(es->s_last_error_func, sbi->s_last_error_func,
6148 sizeof(es->s_last_error_func));
6149 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);
6150 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);
6151 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);
6152 es->s_last_error_errcode =
6153 ext4_errno_to_code(sbi->s_last_error_code);
6154 /*
6155 * Start the daily error reporting function if it hasn't been
6156 * started already
6157 */
6158 if (!es->s_error_count)
6159 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
6160 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);
6161 sbi->s_add_error_count = 0;
6162 }
6163 spin_unlock(&sbi->s_error_lock);
6164
06db49e6 6165 ext4_superblock_csum_set(sb);
2d01ddc8
JK		 6166 unlock_buffer(sbh);
6167}
6168
6169static int ext4_commit_super(struct super_block *sb)
6170{
6171 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2d01ddc8 6172
f88f1466
FC		 6173 if (!sbh)
6174 return -EINVAL;
6175 if (block_device_ejected(sb))
6176 return -ENODEV;
2d01ddc8
JK		 6177
6178 ext4_update_super(sb);
6179
15baa7dc
ZY		 6180 lock_buffer(sbh);
6181 /* Buffer got discarded which means block device got invalidated */
6182 if (!buffer_mapped(sbh)) {
6183 unlock_buffer(sbh);
6184 return -EIO;
6185 }
6186
e8680786 6187 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 6188 /*
6189 * Oh, dear. A previous attempt to write the
6190 * superblock failed. This could happen because the
6191 * USB device was yanked out. Or it could happen to
6192 * be a transient write error and maybe the block will
6193 * be remapped. Nothing we can do but to retry the
6194 * write and hope for the best.
6195 */
6196 ext4_msg(sb, KERN_ERR, "previous I/O error to "
6197 "superblock detected");
6198 clear_buffer_write_io_error(sbh);
6199 set_buffer_uptodate(sbh);
6200 }
15baa7dc
ZY		 6201 get_bh(sbh);
6202 /* Clear potential dirty bit if it was journalled update */
6203 clear_buffer_dirty(sbh);
6204 sbh->b_end_io = end_buffer_write_sync;
1420c4a5
BVA		 6205 submit_bh(REQ_OP_WRITE | REQ_SYNC |
6206 (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh);
15baa7dc 6207 wait_on_buffer(sbh);
4392fbc4
JK		 6208 if (buffer_write_io_error(sbh)) {
6209 ext4_msg(sb, KERN_ERR, "I/O error while writing "
6210 "superblock");
6211 clear_buffer_write_io_error(sbh);
6212 set_buffer_uptodate(sbh);
15baa7dc 6213 return -EIO;
914258bf 6214 }
15baa7dc 6215 return 0;
ac27a0ec
DK		 6216}
6217
ac27a0ec
DK		 6218/*
6219 * Have we just finished recovery? If so, and if we are mounting (or
6220 * remounting) the filesystem readonly, then we will end up with a
6221 * consistent fs on disk. Record that fact.
6222 */
11215630
JK		 6223static int ext4_mark_recovery_complete(struct super_block *sb,
6224 struct ext4_super_block *es)
ac27a0ec 6225{
11215630 6226 int err;
617ba13b 6227 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 6228
e2b911c5 6229 if (!ext4_has_feature_journal(sb)) {
11215630
JK		 6230 if (journal != NULL) {
6231 ext4_error(sb, "Journal got removed while the fs was "
6232 "mounted!");
6233 return -EFSCORRUPTED;
6234 }
6235 return 0;
0390131b 6236 }
dab291af 6237 jbd2_journal_lock_updates(journal);
01d5d965 6238 err = jbd2_journal_flush(journal, 0);
11215630 6239 if (err < 0)
7ffe1ea8
HK		 6240 goto out;
6241
02f310fc
JK		 6242 if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||
6243 ext4_has_feature_orphan_present(sb))) {
6244 if (!ext4_orphan_file_empty(sb)) {
6245 ext4_error(sb, "Orphan file not empty on read-only fs.");
6246 err = -EFSCORRUPTED;
6247 goto out;
6248 }
e2b911c5 6249 ext4_clear_feature_journal_needs_recovery(sb);
02f310fc 6250 ext4_clear_feature_orphan_present(sb);
4392fbc4 6251 ext4_commit_super(sb);
ac27a0ec 6252 }
7ffe1ea8 6253out:
dab291af 6254 jbd2_journal_unlock_updates(journal);
11215630 6255 return err;
ac27a0ec
DK		 6256}
6257
6258/*
6259 * If we are mounting (or read-write remounting) a filesystem whose journal
6260 * has recorded an error from a previous lifetime, move that error to the
6261 * main filesystem now.
6262 */
11215630 6263static int ext4_clear_journal_err(struct super_block *sb,
2b2d6d01 6264 struct ext4_super_block *es)
ac27a0ec
DK		 6265{
6266 journal_t *journal;
6267 int j_errno;
6268 const char *errstr;
6269
11215630
JK		 6270 if (!ext4_has_feature_journal(sb)) {
6271 ext4_error(sb, "Journal got removed while the fs was mounted!");
6272 return -EFSCORRUPTED;
6273 }
0390131b 6274
617ba13b 6275 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 6276
6277 /*
6278 * Now check for any error status which may have been recorded in the
617ba13b 6279 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 6280 */
6281
dab291af 6282 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 6283 if (j_errno) {
6284 char nbuf[16];
6285
617ba13b 6286 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 6287 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 6288 "from previous mount: %s", errstr);
ac27a0ec 6289
617ba13b
MC		 6290 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
6291 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
f57886ca
YB		 6292 j_errno = ext4_commit_super(sb);
6293 if (j_errno)
6294 return j_errno;
6295 ext4_warning(sb, "Marked fs in need of filesystem check.");
ac27a0ec 6296
dab291af 6297 jbd2_journal_clear_err(journal);
d796c52e 6298 jbd2_journal_update_sb_errno(journal);
ac27a0ec 6299 }
11215630 6300 return 0;
ac27a0ec
DK		 6301}
6302
6303/*
6304 * Force the running and committing transactions to commit,
6305 * and wait on the commit.
6306 */
617ba13b 6307int ext4_force_commit(struct super_block *sb)
ac27a0ec 6308{
889860e4 6309 return ext4_journal_force_commit(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 6310}
6311
617ba13b 6312static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 6313{
14ce0cb4 6314 int ret = 0;
9eddacf9 6315 tid_t target;
06a407f1 6316 bool needs_barrier = false;
8d5d02e6 6317 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 6318
eb8ab444 6319 if (unlikely(ext4_forced_shutdown(sb)))
0db1ff22
TT		 6320 return 0;
6321
9bffad1e 6322 trace_ext4_sync_fs(sb, wait);
2e8fa54e 6323 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 6324 /*
6325 * Writeback quota in non-journalled quota case - journalled quota has
6326 * no dirty dquots
6327 */
6328 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 6329 /*
6330 * Data writeback is possible w/o journal transaction, so barrier must
6331 * being sent at the end of the function. But we can skip it if
6332 * transaction_commit will do it for us.
6333 */
bda32530
TT		 6334 if (sbi->s_journal) {
6335 target = jbd2_get_latest_transaction(sbi->s_journal);
6336 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
6337 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
6338 needs_barrier = true;
6339
6340 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
6341 if (wait)
6342 ret = jbd2_log_wait_commit(sbi->s_journal,
6343 target);
6344 }
6345 } else if (wait && test_opt(sb, BARRIER))
06a407f1 6346 needs_barrier = true;
06a407f1
DM		 6347 if (needs_barrier) {
6348 int err;
c6bf3f0e 6349 err = blkdev_issue_flush(sb->s_bdev);
06a407f1
DM		 6350 if (!ret)
6351 ret = err;
0390131b 6352 }
06a407f1
DM		 6353
6354 return ret;
6355}
6356
ac27a0ec
DK		 6357/*
6358 * LVM calls this function before a (read-only) snapshot is created. This
6359 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 6360 *
6361 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 6362 * state independently. It relies on upper layer to stop all data & metadata
6363 * modifications.
ac27a0ec 6364 */
c4be0c1d 6365static int ext4_freeze(struct super_block *sb)
ac27a0ec 6366{
c4be0c1d 6367 int error = 0;
98175720 6368 journal_t *journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 6369
bb044576
TT		 6370 if (journal) {
6371 /* Now we set up the journal barrier. */
6372 jbd2_journal_lock_updates(journal);
ac27a0ec 6373
bb044576
TT		 6374 /*
6375 * Don't clear the needs_recovery flag if we failed to
6376 * flush the journal.
6377 */
01d5d965 6378 error = jbd2_journal_flush(journal, 0);
bb044576
TT		 6379 if (error < 0)
6380 goto out;
c642dc9e
ES		 6381
6382 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 6383 ext4_clear_feature_journal_needs_recovery(sb);
02f310fc
JK		 6384 if (ext4_orphan_file_empty(sb))
6385 ext4_clear_feature_orphan_present(sb);
bb044576 6386 }
9ca92389 6387
4392fbc4 6388 error = ext4_commit_super(sb);
6b0310fb 6389out:
bb044576
TT		 6390 if (journal)
6391 /* we rely on upper layer to stop further updates */
6392 jbd2_journal_unlock_updates(journal);
6b0310fb 6393 return error;
ac27a0ec
DK		 6394}
6395
6396/*
6397 * Called by LVM after the snapshot is done. We need to reset the RECOVER
6398 * flag here, even though the filesystem is not technically dirty yet.
6399 */
c4be0c1d 6400static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 6401{
eb8ab444 6402 if (ext4_forced_shutdown(sb))
9ca92389
TT		 6403 return 0;
6404
c642dc9e
ES		 6405 if (EXT4_SB(sb)->s_journal) {
6406 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 6407 ext4_set_feature_journal_needs_recovery(sb);
02f310fc
JK		 6408 if (ext4_has_feature_orphan_file(sb))
6409 ext4_set_feature_orphan_present(sb);
c642dc9e
ES		 6410 }
6411
4392fbc4 6412 ext4_commit_super(sb);
c4be0c1d 6413 return 0;
ac27a0ec
DK		 6414}
6415
673c6100
TT		 6416/*
6417 * Structure to save mount options for ext4_remount's benefit
6418 */
6419struct ext4_mount_options {
6420 unsigned long s_mount_opt;
a2595b8a 6421 unsigned long s_mount_opt2;
08cefc7a
EB		 6422 kuid_t s_resuid;
6423 kgid_t s_resgid;
673c6100
TT		 6424 unsigned long s_commit_interval;
6425 u32 s_min_batch_time, s_max_batch_time;
6426#ifdef CONFIG_QUOTA
6427 int s_jquota_fmt;
a2d4a646 6428 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 6429#endif
6430};
6431
960e0ab6 6432static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
ac27a0ec 6433{
7edfd85b 6434 struct ext4_fs_context *ctx = fc->fs_private;
2b2d6d01 6435 struct ext4_super_block *es;
617ba13b 6436 struct ext4_sb_info *sbi = EXT4_SB(sb);
960e0ab6 6437 unsigned long old_sb_flags;
617ba13b 6438 struct ext4_mount_options old_opts;
8a266467 6439 ext4_group_t g;
c5e06d10 6440 int err = 0;
745f17a4 6441 int alloc_ctx;
ac27a0ec 6442#ifdef CONFIG_QUOTA
3bbef91b 6443 int enable_quota = 0;
03dafb5f 6444 int i, j;
33458eab 6445 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec
DK		 6446#endif
6447
21ac738e 6448
ac27a0ec
DK		 6449 /* Store the original options */
6450 old_sb_flags = sb->s_flags;
6451 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 6452 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 6453 old_opts.s_resuid = sbi->s_resuid;
6454 old_opts.s_resgid = sbi->s_resgid;
6455 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 6456 old_opts.s_min_batch_time = sbi->s_min_batch_time;
6457 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 6458#ifdef CONFIG_QUOTA
6459 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 6460 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 6461 if (sbi->s_qf_names[i]) {
33458eab
TT		 6462 char *qf_name = get_qf_name(sb, sbi, i);
6463
6464 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 6465 if (!old_opts.s_qf_names[i]) {
6466 for (j = 0; j < i; j++)
6467 kfree(old_opts.s_qf_names[j]);
6468 return -ENOMEM;
6469 }
6470 } else
6471 old_opts.s_qf_names[i] = NULL;
ac27a0ec 6472#endif
e4e58e5d
OM		 6473 if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) {
6474 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
6475 ctx->journal_ioprio =
6476 sbi->s_journal->j_task->io_context->ioprio;
6477 else
6478 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
6479
6480 }
ac27a0ec 6481
745f17a4
BL		 6482 /*
6483 * Changing the DIOREAD_NOLOCK or DELALLOC mount options may cause
6484 * two calls to ext4_should_dioread_nolock() to return inconsistent
6485 * values, triggering WARN_ON in ext4_add_complete_io(). we grab
6486 * here s_writepages_rwsem to avoid race between writepages ops and
6487 * remount.
6488 */
6489 alloc_ctx = ext4_writepages_down_write(sb);
7edfd85b 6490 ext4_apply_options(fc, sb);
745f17a4 6491 ext4_writepages_up_write(sb, alloc_ctx);
ac27a0ec 6492
6b992ff2 6493 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 6494 test_opt(sb, JOURNAL_CHECKSUM)) {
6495 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 6496 "during remount not supported; ignoring");
6497 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 6498 }
6499
6ae6514b
PS		 6500 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
6501 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
6502 ext4_msg(sb, KERN_ERR, "can't mount with "
6503 "both data=journal and delalloc");
6504 err = -EINVAL;
6505 goto restore_opts;
6506 }
6507 if (test_opt(sb, DIOREAD_NOLOCK)) {
6508 ext4_msg(sb, KERN_ERR, "can't mount with "
6509 "both data=journal and dioread_nolock");
6510 err = -EINVAL;
6511 goto restore_opts;
6512 }
ab04df78
JK		 6513 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
6514 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
6515 ext4_msg(sb, KERN_ERR, "can't mount with "
6516 "journal_async_commit in data=ordered mode");
6517 err = -EINVAL;
6518 goto restore_opts;
6519 }
923ae0ff
RZ		 6520 }
6521
cdb7ee4c
TE		 6522 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
6523 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
6524 err = -EINVAL;
6525 goto restore_opts;
6526 }
6527
22b8d707 6528 if (test_opt2(sb, ABORT))
124e7c61 6529 ext4_abort(sb, ESHUTDOWN, "Abort forced by user");
ac27a0ec 6530
1751e8a6
LT		 6531 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
6532 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 6533
6534 es = sbi->s_es;
6535
b3881f74 6536 if (sbi->s_journal) {
0390131b 6537 ext4_init_journal_params(sb, sbi->s_journal);
7edfd85b 6538 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
b3881f74 6539 }
ac27a0ec 6540
c92dc856 6541 /* Flush outstanding errors before changing fs state */
bb15cea2 6542 flush_work(&sbi->s_sb_upd_work);
c92dc856 6543
960e0ab6 6544 if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) {
95257987 6545 if (ext4_forced_shutdown(sb)) {
ac27a0ec
DK		 6546 err = -EROFS;
6547 goto restore_opts;
6548 }
6549
960e0ab6 6550 if (fc->sb_flags & SB_RDONLY) {
38c03b34
TT		 6551 err = sync_filesystem(sb);
6552 if (err < 0)
6553 goto restore_opts;
0f0dd62f
CH		 6554 err = dquot_suspend(sb, -1);
6555 if (err < 0)
c79d967d 6556 goto restore_opts;
c79d967d 6557
ac27a0ec
DK		 6558 /*
6559 * First of all, the unconditional stuff we have to do
6560 * to disable replay of the journal when we next remount
6561 */
1751e8a6 6562 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 6563
6564 /*
6565 * OK, test if we are remounting a valid rw partition
6566 * readonly, and if so set the rdonly flag and then
6567 * mark the partition as valid again.
6568 */
617ba13b
MC		 6569 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
6570 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 6571 es->s_state = cpu_to_le16(sbi->s_mount_state);
6572
11215630
JK		 6573 if (sbi->s_journal) {
6574 /*
6575 * We let remount-ro finish even if marking fs
6576 * as clean failed...
6577 */
0390131b 6578 ext4_mark_recovery_complete(sb, es);
11215630 6579 }
ac27a0ec 6580 } else {
a13fb1a4 6581 /* Make sure we can mount this feature set readwrite */
e2b911c5 6582 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 6583 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 6584 err = -EROFS;
6585 goto restore_opts;
6586 }
8a266467
TT		 6587 /*
6588 * Make sure the group descriptor checksums
0b8e58a1 6589 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 6590 */
6591 for (g = 0; g < sbi->s_groups_count; g++) {
6592 struct ext4_group_desc *gdp =
6593 ext4_get_group_desc(sb, g, NULL);
6594
feb0ab32 6595 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 6596 ext4_msg(sb, KERN_ERR,
6597 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 6598 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 6599 le16_to_cpu(gdp->bg_checksum));
6a797d27 6600 err = -EFSBADCRC;
8a266467
TT		 6601 goto restore_opts;
6602 }
6603 }
6604
ead6596b
ES		 6605 /*
6606 * If we have an unprocessed orphan list hanging
6607 * around from a previously readonly bdev mount,
6608 * require a full umount/remount for now.
6609 */
02f310fc 6610 if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {
b31e1552 6611 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 6612 "remount RDWR because of unprocessed "
6613 "orphan inode list. Please "
b31e1552 6614 "umount/remount instead");
ead6596b
ES		 6615 err = -EINVAL;
6616 goto restore_opts;
6617 }
6618
ac27a0ec
DK		 6619 /*
6620 * Mounting a RDONLY partition read-write, so reread
6621 * and store the current valid flag. (It may have
6622 * been changed by e2fsck since we originally mounted
6623 * the partition.)
6624 */
11215630
JK		 6625 if (sbi->s_journal) {
6626 err = ext4_clear_journal_err(sb, es);
6627 if (err)
6628 goto restore_opts;
6629 }
c878bea3
TT		 6630 sbi->s_mount_state = (le16_to_cpu(es->s_state) &
6631 ~EXT4_FC_REPLAY);
c89128a0
JK		 6632
6633 err = ext4_setup_super(sb, es, 0);
6634 if (err)
6635 goto restore_opts;
6636
1b292439 6637 sb->s_flags &= ~SB_RDONLY;
3b50d501
TT		 6638 if (ext4_has_feature_mmp(sb)) {
6639 err = ext4_multi_mount_protect(sb,
6640 le64_to_cpu(es->s_mmp_block));
6641 if (err)
c5e06d10 6642 goto restore_opts;
3b50d501 6643 }
3bbef91b 6644#ifdef CONFIG_QUOTA
c79d967d 6645 enable_quota = 1;
3bbef91b 6646#endif
ac27a0ec
DK		 6647 }
6648 }
bfff6873 6649
0f5bde1d
JK		 6650 /*
6651 * Handle creation of system zone data early because it can fail.
6652 * Releasing of existing data is done when we are sure remount will
6653 * succeed.
6654 */
dd0db94f 6655 if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {
0f5bde1d
JK		 6656 err = ext4_setup_system_zone(sb);
6657 if (err)
6658 goto restore_opts;
6659 }
d176b1f6 6660
c89128a0 6661 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
4392fbc4 6662 err = ext4_commit_super(sb);
c89128a0
JK		 6663 if (err)
6664 goto restore_opts;
6665 }
0390131b 6666
ac27a0ec 6667#ifdef CONFIG_QUOTA
7c319d32
AK		 6668 if (enable_quota) {
6669 if (sb_any_quota_suspended(sb))
6670 dquot_resume(sb, -1);
e2b911c5 6671 else if (ext4_has_feature_quota(sb)) {
7c319d32 6672 err = ext4_enable_quotas(sb);
07724f98 6673 if (err)
7c319d32 6674 goto restore_opts;
7c319d32
AK		 6675 }
6676 }
4c0b4818
TT		 6677 /* Release old quota file names */
6678 for (i = 0; i < EXT4_MAXQUOTAS; i++)
6679 kfree(old_opts.s_qf_names[i]);
ac27a0ec 6680#endif
dd0db94f 6681 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
0f5bde1d 6682 ext4_release_system_zone(sb);
d4c402d9 6683
eb1f822c
TT		 6684 /*
6685 * Reinitialize lazy itable initialization thread based on
6686 * current settings
6687 */
6688 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
6689 ext4_unregister_li_request(sb);
6690 else {
6691 ext4_group_t first_not_zeroed;
6692 first_not_zeroed = ext4_has_uninit_itable(sb);
6693 ext4_register_li_request(sb, first_not_zeroed);
6694 }
6695
61bb4a1c
TT		 6696 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6697 ext4_stop_mmpd(sbi);
6698
ac27a0ec 6699 return 0;
0b8e58a1 6700
ac27a0ec 6701restore_opts:
4c0b4818
TT		 6702 /*
6703 * If there was a failing r/w to ro transition, we may need to
6704 * re-enable quota
6705 */
d5d020b3 6706 if (sb_rdonly(sb) && !(old_sb_flags & SB_RDONLY) &&
4c0b4818
TT		 6707 sb_any_quota_suspended(sb))
6708 dquot_resume(sb, -1);
745f17a4
BL		 6709
6710 alloc_ctx = ext4_writepages_down_write(sb);
ac27a0ec
DK		 6711 sb->s_flags = old_sb_flags;
6712 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 6713 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 6714 sbi->s_resuid = old_opts.s_resuid;
6715 sbi->s_resgid = old_opts.s_resgid;
6716 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 6717 sbi->s_min_batch_time = old_opts.s_min_batch_time;
6718 sbi->s_max_batch_time = old_opts.s_max_batch_time;
745f17a4
BL		 6719 ext4_writepages_up_write(sb, alloc_ctx);
6720
dd0db94f 6721 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
0f5bde1d 6722 ext4_release_system_zone(sb);
ac27a0ec
DK		 6723#ifdef CONFIG_QUOTA
6724 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 6725 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
33458eab
TT		 6726 to_free[i] = get_qf_name(sb, sbi, i);
6727 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 6728 }
33458eab
TT		 6729 synchronize_rcu();
6730 for (i = 0; i < EXT4_MAXQUOTAS; i++)
6731 kfree(to_free[i]);
ac27a0ec 6732#endif
61bb4a1c
TT		 6733 if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6734 ext4_stop_mmpd(sbi);
ac27a0ec
DK		 6735 return err;
6736}
6737
cebe85d5 6738static int ext4_reconfigure(struct fs_context *fc)
7edfd85b 6739{
cebe85d5 6740 struct super_block *sb = fc->root->d_sb;
7edfd85b
LC		 6741 int ret;
6742
cebe85d5 6743 fc->s_fs_info = EXT4_SB(sb);
7edfd85b 6744
cebe85d5 6745 ret = ext4_check_opt_consistency(fc, sb);
7edfd85b 6746 if (ret < 0)
cebe85d5 6747 return ret;
7edfd85b 6748
960e0ab6 6749 ret = __ext4_remount(fc, sb);
7edfd85b 6750 if (ret < 0)
cebe85d5 6751 return ret;
7edfd85b 6752
6dcc98fb
TT		 6753 ext4_msg(sb, KERN_INFO, "re-mounted %pU %s. Quota mode: %s.",
6754 &sb->s_uuid, sb_rdonly(sb) ? "ro" : "r/w",
6755 ext4_quota_mode(sb));
7edfd85b 6756
7edfd85b 6757 return 0;
7edfd85b
LC		 6758}
6759
689c958c
LX		 6760#ifdef CONFIG_QUOTA
6761static int ext4_statfs_project(struct super_block *sb,
6762 kprojid_t projid, struct kstatfs *buf)
6763{
6764 struct kqid qid;
6765 struct dquot *dquot;
6766 u64 limit;
6767 u64 curblock;
6768
6769 qid = make_kqid_projid(projid);
6770 dquot = dqget(sb, qid);
6771 if (IS_ERR(dquot))
6772 return PTR_ERR(dquot);
7b9ca4c6 6773 spin_lock(&dquot->dq_dqb_lock);
689c958c 6774
a08fe66e
CX		 6775 limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
6776 dquot->dq_dqb.dqb_bhardlimit);
57c32ea4
CX		 6777 limit >>= sb->s_blocksize_bits;
6778
689c958c 6779 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 6780 curblock = (dquot->dq_dqb.dqb_curspace +
6781 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 6782 buf->f_blocks = limit;
6783 buf->f_bfree = buf->f_bavail =
6784 (buf->f_blocks > curblock) ?
6785 (buf->f_blocks - curblock) : 0;
6786 }
6787
a08fe66e
CX		 6788 limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
6789 dquot->dq_dqb.dqb_ihardlimit);
689c958c
LX		 6790 if (limit && buf->f_files > limit) {
6791 buf->f_files = limit;
6792 buf->f_ffree =
6793 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
6794 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
6795 }
6796
7b9ca4c6 6797 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 6798 dqput(dquot);
6799 return 0;
6800}
6801#endif
6802
2b2d6d01 6803static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 6804{
6805 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 6806 struct ext4_sb_info *sbi = EXT4_SB(sb);
6807 struct ext4_super_block *es = sbi->s_es;
27dd4385 6808 ext4_fsblk_t overhead = 0, resv_blocks;
d02a9391 6809 s64 bfree;
27dd4385 6810 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 6811
952fc18e
TT		 6812 if (!test_opt(sb, MINIX_DF))
6813 overhead = sbi->s_overhead;
ac27a0ec 6814
617ba13b 6815 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 6816 buf->f_bsize = sb->s_blocksize;
b72f78cb 6817 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 6818 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
6819 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 6820 /* prevent underflow in case that few free space is available */
57042651 6821 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 6822 buf->f_bavail = buf->f_bfree -
6823 (ext4_r_blocks_count(es) + resv_blocks);
6824 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 6825 buf->f_bavail = 0;
6826 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 6827 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 6828 buf->f_namelen = EXT4_NAME_LEN;
9591c3a3 6829 buf->f_fsid = uuid_to_fsid(es->s_uuid);
0b8e58a1 6830
689c958c
LX		 6831#ifdef CONFIG_QUOTA
6832 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
6833 sb_has_quota_limits_enabled(sb, PRJQUOTA))
6834 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
6835#endif
ac27a0ec
DK		 6836 return 0;
6837}
6838
ac27a0ec
DK		 6839
6840#ifdef CONFIG_QUOTA
6841
bc8230ee
JK		 6842/*
6843 * Helper functions so that transaction is started before we acquire dqio_sem
6844 * to keep correct lock ordering of transaction > dqio_sem
6845 */
ac27a0ec
DK		 6846static inline struct inode *dquot_to_inode(struct dquot *dquot)
6847{
4c376dca 6848 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 6849}
6850
617ba13b 6851static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 6852{
6853 int ret, err;
6854 handle_t *handle;
6855 struct inode *inode;
6856
6857 inode = dquot_to_inode(dquot);
9924a92a 6858 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 6859 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 6860 if (IS_ERR(handle))
6861 return PTR_ERR(handle);
6862 ret = dquot_commit(dquot);
d8b945fa
YB		 6863 if (ret < 0)
6864 ext4_error_err(dquot->dq_sb, -ret,
6865 "Failed to commit dquot type %d",
6866 dquot->dq_id.type);
617ba13b 6867 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6868 if (!ret)
6869 ret = err;
6870 return ret;
6871}
6872
617ba13b 6873static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 6874{
6875 int ret, err;
6876 handle_t *handle;
6877
9924a92a 6878 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 6879 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 6880 if (IS_ERR(handle))
6881 return PTR_ERR(handle);
6882 ret = dquot_acquire(dquot);
d8b945fa
YB		 6883 if (ret < 0)
6884 ext4_error_err(dquot->dq_sb, -ret,
6885 "Failed to acquire dquot type %d",
6886 dquot->dq_id.type);
617ba13b 6887 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6888 if (!ret)
6889 ret = err;
6890 return ret;
6891}
6892
617ba13b 6893static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 6894{
6895 int ret, err;
6896 handle_t *handle;
6897
9924a92a 6898 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 6899 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 6900 if (IS_ERR(handle)) {
6901 /* Release dquot anyway to avoid endless cycle in dqput() */
6902 dquot_release(dquot);
ac27a0ec 6903 return PTR_ERR(handle);
9c3013e9 6904 }
ac27a0ec 6905 ret = dquot_release(dquot);
d8b945fa
YB		 6906 if (ret < 0)
6907 ext4_error_err(dquot->dq_sb, -ret,
6908 "Failed to release dquot type %d",
6909 dquot->dq_id.type);
617ba13b 6910 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6911 if (!ret)
6912 ret = err;
6913 return ret;
6914}
6915
617ba13b 6916static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 6917{
262b4662 6918 struct super_block *sb = dquot->dq_sb;
262b4662 6919
f177ee08 6920 if (ext4_is_quota_journalled(sb)) {
ac27a0ec 6921 dquot_mark_dquot_dirty(dquot);
617ba13b 6922 return ext4_write_dquot(dquot);
ac27a0ec
DK		 6923 } else {
6924 return dquot_mark_dquot_dirty(dquot);
6925 }
6926}
6927
617ba13b 6928static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 6929{
6930 int ret, err;
6931 handle_t *handle;
6932
6933 /* Data block + inode block */
f9c1f248 6934 handle = ext4_journal_start_sb(sb, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 6935 if (IS_ERR(handle))
6936 return PTR_ERR(handle);
6937 ret = dquot_commit_info(sb, type);
617ba13b 6938 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6939 if (!ret)
6940 ret = err;
6941 return ret;
6942}
6943
daf647d2
TT		 6944static void lockdep_set_quota_inode(struct inode *inode, int subclass)
6945{
6946 struct ext4_inode_info *ei = EXT4_I(inode);
6947
6948 /* The first argument of lockdep_set_subclass has to be
6949 * *exactly* the same as the argument to init_rwsem() --- in
6950 * this case, in init_once() --- or lockdep gets unhappy
6951 * because the name of the lock is set using the
6952 * stringification of the argument to init_rwsem().
6953 */
6954 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
6955 lockdep_set_subclass(&ei->i_data_sem, subclass);
6956}
6957
ac27a0ec
DK		 6958/*
6959 * Standard function to be called on quota_on
6960 */
617ba13b 6961static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 6962 const struct path *path)
ac27a0ec
DK		 6963{
6964 int err;
ac27a0ec
DK		 6965
6966 if (!test_opt(sb, QUOTA))
6967 return -EINVAL;
0623543b 6968
ac27a0ec 6969 /* Quotafile not on the same filesystem? */
d8c9584e 6970 if (path->dentry->d_sb != sb)
ac27a0ec 6971 return -EXDEV;
e0770e91
JK		 6972
6973 /* Quota already enabled for this file? */
6974 if (IS_NOQUOTA(d_inode(path->dentry)))
6975 return -EBUSY;
6976
0623543b
JK		 6977 /* Journaling quota? */
6978 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 6979 /* Quotafile not in fs root? */
f00c9e44 6980 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 6981 ext4_msg(sb, KERN_WARNING,
6982 "Quota file not on filesystem root. "
6983 "Journaled quota will not work");
91389240
JK		 6984 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6985 } else {
6986 /*
6987 * Clear the flag just in case mount options changed since
6988 * last time.
6989 */
6990 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 6991 }
0623543b 6992
daf647d2
TT		 6993 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6994 err = dquot_quota_on(sb, type, format_id, path);
15fc69bb 6995 if (!err) {
957153fc
JK		 6996 struct inode *inode = d_inode(path->dentry);
6997 handle_t *handle;
6998
61a92987
JK		 6999 /*
7000 * Set inode flags to prevent userspace from messing with quota
7001 * files. If this fails, we return success anyway since quotas
7002 * are already enabled and this is not a hard failure.
7003 */
957153fc
JK		 7004 inode_lock(inode);
7005 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
7006 if (IS_ERR(handle))
7007 goto unlock_inode;
7008 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
7009 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
7010 S_NOATIME | S_IMMUTABLE);
4209ae12 7011 err = ext4_mark_inode_dirty(handle, inode);
957153fc
JK		 7012 ext4_journal_stop(handle);
7013 unlock_inode:
7014 inode_unlock(inode);
15fc69bb
JK		 7015 if (err)
7016 dquot_quota_off(sb, type);
957153fc 7017 }
15fc69bb
JK		 7018 if (err)
7019 lockdep_set_quota_inode(path->dentry->d_inode,
7020 I_DATA_SEM_NORMAL);
daf647d2 7021 return err;
ac27a0ec
DK		 7022}
7023
07342ec2
BL		 7024static inline bool ext4_check_quota_inum(int type, unsigned long qf_inum)
7025{
7026 switch (type) {
7027 case USRQUOTA:
7028 return qf_inum == EXT4_USR_QUOTA_INO;
7029 case GRPQUOTA:
7030 return qf_inum == EXT4_GRP_QUOTA_INO;
7031 case PRJQUOTA:
7032 return qf_inum >= EXT4_GOOD_OLD_FIRST_INO;
7033 default:
7034 BUG();
7035 }
7036}
7037
7c319d32
AK		 7038static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
7039 unsigned int flags)
7040{
7041 int err;
7042 struct inode *qf_inode;
a2d4a646 7043 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 7044 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 7045 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
7046 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 7047 };
7048
e2b911c5 7049 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 7050
7051 if (!qf_inums[type])
7052 return -EPERM;
7053
07342ec2
BL		 7054 if (!ext4_check_quota_inum(type, qf_inums[type])) {
7055 ext4_error(sb, "Bad quota inum: %lu, type: %d",
7056 qf_inums[type], type);
7057 return -EUCLEAN;
7058 }
7059
8a363970 7060 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32 7061 if (IS_ERR(qf_inode)) {
07342ec2
BL		 7062 ext4_error(sb, "Bad quota inode: %lu, type: %d",
7063 qf_inums[type], type);
7c319d32
AK		 7064 return PTR_ERR(qf_inode);
7065 }
7066
bcb13850
JK		 7067 /* Don't account quota for quota files to avoid recursion */
7068 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 7069 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7212b95e 7070 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
daf647d2
TT		 7071 if (err)
7072 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
61157b24 7073 iput(qf_inode);
7c319d32
AK		 7074
7075 return err;
7076}
7077
7078/* Enable usage tracking for all quota types. */
25c6d98f 7079int ext4_enable_quotas(struct super_block *sb)
7c319d32
AK		 7080{
7081 int type, err = 0;
a2d4a646 7082 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 7083 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 7084 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
7085 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 7086 };
49da9392
JK		 7087 bool quota_mopt[EXT4_MAXQUOTAS] = {
7088 test_opt(sb, USRQUOTA),
7089 test_opt(sb, GRPQUOTA),
7090 test_opt(sb, PRJQUOTA),
7091 };
7c319d32 7092
91389240 7093 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 7094 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 7095 if (qf_inums[type]) {
7096 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 7097 DQUOT_USAGE_ENABLED |
7098 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 7099 if (err) {
7100 ext4_warning(sb,
72ba7450 7101 "Failed to enable quota tracking "
07342ec2
BL		 7102 "(type=%d, err=%d, ino=%lu). "
7103 "Please run e2fsck to fix.", type,
7104 err, qf_inums[type]);
7f144fd0 7105
f3c1c42e 7106 ext4_quotas_off(sb, type);
7c319d32
AK		 7107 return err;
7108 }
7109 }
7110 }
7111 return 0;
7112}
7113
ca0e05e4
DM		 7114static int ext4_quota_off(struct super_block *sb, int type)
7115{
21f97697
JK		 7116 struct inode *inode = sb_dqopt(sb)->files[type];
7117 handle_t *handle;
957153fc 7118 int err;
21f97697 7119
87009d86
DM		 7120 /* Force all delayed allocation blocks to be allocated.
7121 * Caller already holds s_umount sem */
7122 if (test_opt(sb, DELALLOC))
ca0e05e4 7123 sync_filesystem(sb);
ca0e05e4 7124
957153fc 7125 if (!inode || !igrab(inode))
0b268590
AG		 7126 goto out;
7127
957153fc 7128 err = dquot_quota_off(sb, type);
964edf66 7129 if (err || ext4_has_feature_quota(sb))
957153fc 7130 goto out_put;
e0e985f3
JK		 7131 /*
7132 * When the filesystem was remounted read-only first, we cannot cleanup
7133 * inode flags here. Bad luck but people should be using QUOTA feature
7134 * these days anyway.
7135 */
7136 if (sb_rdonly(sb))
7137 goto out_put;
957153fc
JK		 7138
7139 inode_lock(inode);
61a92987
JK		 7140 /*
7141 * Update modification times of quota files when userspace can
7142 * start looking at them. If we fail, we return success anyway since
7143 * this is not a hard failure and quotas are already disabled.
7144 */
9924a92a 7145 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
4209ae12
HS		 7146 if (IS_ERR(handle)) {
7147 err = PTR_ERR(handle);
957153fc 7148 goto out_unlock;
4209ae12 7149 }
957153fc
JK		 7150 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
7151 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
b898ab23 7152 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
4209ae12 7153 err = ext4_mark_inode_dirty(handle, inode);
21f97697 7154 ext4_journal_stop(handle);
957153fc
JK		 7155out_unlock:
7156 inode_unlock(inode);
7157out_put:
964edf66 7158 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 7159 iput(inode);
7160 return err;
21f97697 7161out:
ca0e05e4
DM		 7162 return dquot_quota_off(sb, type);
7163}
7164
ac27a0ec
DK		 7165/* Read data from quotafile - avoid pagecache and such because we cannot afford
7166 * acquiring the locks... As quota files are never truncated and quota code
25985edc 7167 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 7168 * we don't have to be afraid of races */
617ba13b 7169static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 7170 size_t len, loff_t off)
7171{
7172 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 7173 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 7174 int offset = off & (sb->s_blocksize - 1);
7175 int tocopy;
7176 size_t toread;
7177 struct buffer_head *bh;
7178 loff_t i_size = i_size_read(inode);
7179
7180 if (off > i_size)
7181 return 0;
7182 if (off+len > i_size)
7183 len = i_size-off;
7184 toread = len;
7185 while (toread > 0) {
66267814 7186 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
1c215028
TT		 7187 bh = ext4_bread(NULL, inode, blk, 0);
7188 if (IS_ERR(bh))
7189 return PTR_ERR(bh);
ac27a0ec
DK		 7190 if (!bh) /* A hole? */
7191 memset(data, 0, tocopy);
7192 else
7193 memcpy(data, bh->b_data+offset, tocopy);
7194 brelse(bh);
7195 offset = 0;
7196 toread -= tocopy;
7197 data += tocopy;
7198 blk++;
7199 }
7200 return len;
7201}
7202
7203/* Write to quotafile (we know the transaction is already started and has
7204 * enough credits) */
617ba13b 7205static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 7206 const char *data, size_t len, loff_t off)
7207{
7208 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 7209 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4209ae12 7210 int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
c5e298ae 7211 int retries = 0;
ac27a0ec
DK		 7212 struct buffer_head *bh;
7213 handle_t *handle = journal_current_handle();
7214
380a0091 7215 if (!handle) {
b31e1552
ES		 7216 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7217 " cancelled because transaction is not started",
9c3013e9
JK		 7218 (unsigned long long)off, (unsigned long long)len);
7219 return -EIO;
7220 }
67eeb568
DM		 7221 /*
7222 * Since we account only one data block in transaction credits,
7223 * then it is impossible to cross a block boundary.
7224 */
7225 if (sb->s_blocksize - offset < len) {
7226 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7227 " cancelled because not block aligned",
7228 (unsigned long long)off, (unsigned long long)len);
7229 return -EIO;
7230 }
7231
c5e298ae
TT		 7232 do {
7233 bh = ext4_bread(handle, inode, blk,
7234 EXT4_GET_BLOCKS_CREATE |
7235 EXT4_GET_BLOCKS_METADATA_NOFAIL);
45586c70 7236 } while (PTR_ERR(bh) == -ENOSPC &&
c5e298ae 7237 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 7238 if (IS_ERR(bh))
7239 return PTR_ERR(bh);
67eeb568
DM		 7240 if (!bh)
7241 goto out;
5d601255 7242 BUFFER_TRACE(bh, "get write access");
188c299e 7243 err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
62d2b5f2
JK		 7244 if (err) {
7245 brelse(bh);
1c215028 7246 return err;
ac27a0ec 7247 }
67eeb568
DM		 7248 lock_buffer(bh);
7249 memcpy(bh->b_data+offset, data, len);
7250 flush_dcache_page(bh->b_page);
7251 unlock_buffer(bh);
62d2b5f2 7252 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 7253 brelse(bh);
ac27a0ec 7254out:
67eeb568
DM		 7255 if (inode->i_size < off + len) {
7256 i_size_write(inode, off + len);
617ba13b 7257 EXT4_I(inode)->i_disksize = inode->i_size;
4209ae12
HS		 7258 err2 = ext4_mark_inode_dirty(handle, inode);
7259 if (unlikely(err2 && !err))
7260 err = err2;
ac27a0ec 7261 }
4209ae12 7262 return err ? err : len;
ac27a0ec 7263}
ac27a0ec
DK		 7264#endif
7265
c290ea01 7266#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 7267static inline void register_as_ext2(void)
7268{
7269 int err = register_filesystem(&ext2_fs_type);
7270 if (err)
7271 printk(KERN_WARNING
7272 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
7273}
7274
7275static inline void unregister_as_ext2(void)
7276{
7277 unregister_filesystem(&ext2_fs_type);
7278}
2035e776
TT		 7279
7280static inline int ext2_feature_set_ok(struct super_block *sb)
7281{
e2b911c5 7282 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 7283 return 0;
bc98a42c 7284 if (sb_rdonly(sb))
2035e776 7285 return 1;
e2b911c5 7286 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 7287 return 0;
7288 return 1;
7289}
24b58424
TT		 7290#else
7291static inline void register_as_ext2(void) { }
7292static inline void unregister_as_ext2(void) { }
2035e776 7293static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 7294#endif
7295
24b58424
TT		 7296static inline void register_as_ext3(void)
7297{
7298 int err = register_filesystem(&ext3_fs_type);
7299 if (err)
7300 printk(KERN_WARNING
7301 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
7302}
7303
7304static inline void unregister_as_ext3(void)
7305{
7306 unregister_filesystem(&ext3_fs_type);
7307}
2035e776
TT		 7308
7309static inline int ext3_feature_set_ok(struct super_block *sb)
7310{
e2b911c5 7311 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 7312 return 0;
e2b911c5 7313 if (!ext4_has_feature_journal(sb))
2035e776 7314 return 0;
bc98a42c 7315 if (sb_rdonly(sb))
2035e776 7316 return 1;
e2b911c5 7317 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 7318 return 0;
7319 return 1;
7320}
24b58424 7321
1489dffd
CH		 7322static void ext4_kill_sb(struct super_block *sb)
7323{
7324 struct ext4_sb_info *sbi = EXT4_SB(sb);
61ead714 7325 struct file *bdev_file = sbi ? sbi->s_journal_bdev_file : NULL;
1489dffd
CH		 7326
7327 kill_block_super(sb);
7328
61ead714 7329 if (bdev_file)
22650a99 7330 bdev_fput(bdev_file);
1489dffd
CH		 7331}
7332
03010a33 7333static struct file_system_type ext4_fs_type = {
cebe85d5
LC		 7334 .owner = THIS_MODULE,
7335 .name = "ext4",
7336 .init_fs_context = ext4_init_fs_context,
7337 .parameters = ext4_param_specs,
1489dffd 7338 .kill_sb = ext4_kill_sb,
50ec1d72 7339 .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
03010a33 7340};
7f78e035 7341MODULE_ALIAS_FS("ext4");
03010a33 7342
e9e3bcec
ES		 7343/* Shared across all ext4 file systems */
7344wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 7345
5dabfc78 7346static int __init ext4_init_fs(void)
ac27a0ec 7347{
e9e3bcec 7348 int i, err;
c9de560d 7349
e294a537 7350 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8 7351 ext4_li_info = NULL;
07c0c5d8 7352
9a4c8019 7353 /* Build-time check for flags consistency */
12e9b892 7354 ext4_check_flag_values();
e9e3bcec 7355
e142d052 7356 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 7357 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 7358
51865fda 7359 err = ext4_init_es();
6fd058f7
TT		 7360 if (err)
7361 return err;
51865fda 7362
1dc0aa46 7363 err = ext4_init_pending();
22cfe4b4
EB		 7364 if (err)
7365 goto out7;
7366
7367 err = ext4_init_post_read_processing();
1dc0aa46
EW		 7368 if (err)
7369 goto out6;
7370
51865fda
ZL		 7371 err = ext4_init_pageio();
7372 if (err)
b5799018 7373 goto out5;
51865fda 7374
5dabfc78 7375 err = ext4_init_system_zone();
bd2d0210 7376 if (err)
b5799018 7377 goto out4;
857ac889 7378
b5799018 7379 err = ext4_init_sysfs();
dd68314c 7380 if (err)
b5799018 7381 goto out3;
857ac889 7382
5dabfc78 7383 err = ext4_init_mballoc();
c9de560d
AT		 7384 if (err)
7385 goto out2;
ac27a0ec
DK		 7386 err = init_inodecache();
7387 if (err)
7388 goto out1;
aa75f4d3
HS		 7389
7390 err = ext4_fc_init_dentry_cache();
7391 if (err)
7392 goto out05;
7393
24b58424 7394 register_as_ext3();
2035e776 7395 register_as_ext2();
03010a33 7396 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 7397 if (err)
7398 goto out;
bfff6873 7399
ac27a0ec
DK		 7400 return 0;
7401out:
24b58424
TT		 7402 unregister_as_ext2();
7403 unregister_as_ext3();
ab047d51 7404 ext4_fc_destroy_dentry_cache();
aa75f4d3 7405out05:
ac27a0ec
DK		 7406 destroy_inodecache();
7407out1:
5dabfc78 7408 ext4_exit_mballoc();
9c191f70 7409out2:
b5799018
TT		 7410 ext4_exit_sysfs();
7411out3:
5dabfc78 7412 ext4_exit_system_zone();
b5799018 7413out4:
5dabfc78 7414 ext4_exit_pageio();
b5799018 7415out5:
22cfe4b4 7416 ext4_exit_post_read_processing();
1dc0aa46 7417out6:
22cfe4b4
EB		 7418 ext4_exit_pending();
7419out7:
51865fda
ZL		 7420 ext4_exit_es();
7421
ac27a0ec
DK		 7422 return err;
7423}
7424
5dabfc78 7425static void __exit ext4_exit_fs(void)
ac27a0ec 7426{
bfff6873 7427 ext4_destroy_lazyinit_thread();
24b58424
TT		 7428 unregister_as_ext2();
7429 unregister_as_ext3();
03010a33 7430 unregister_filesystem(&ext4_fs_type);
ab047d51 7431 ext4_fc_destroy_dentry_cache();
ac27a0ec 7432 destroy_inodecache();
5dabfc78 7433 ext4_exit_mballoc();
b5799018 7434 ext4_exit_sysfs();
5dabfc78
TT		 7435 ext4_exit_system_zone();
7436 ext4_exit_pageio();
22cfe4b4 7437 ext4_exit_post_read_processing();
dd12ed14 7438 ext4_exit_es();
1dc0aa46 7439 ext4_exit_pending();
ac27a0ec
DK		 7440}
7441
7442MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 7443MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 7444MODULE_LICENSE("GPL");
7ef79ad5 7445MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 7446module_init(ext4_init_fs)
7447module_exit(ext4_exit_fs)
Linux 6.x block layer and io_uring tree(s)