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Merge branch 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[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>
7abc52c2 42#include <linux/cleancache.h>
7c0f6ba6 43#include <linux/uaccess.h>
ee73f9a5 44#include <linux/iversion.h>
c83ad55e 45#include <linux/unicode.h>
c6a564ff 46#include <linux/part_stat.h>
bfff6873
LC		 47#include <linux/kthread.h>
48#include <linux/freezer.h>
49
3dcf5451 50#include "ext4.h"
4a092d73 51#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 52#include "ext4_jbd2.h"
ac27a0ec
DK		 53#include "xattr.h"
54#include "acl.h"
3661d286 55#include "mballoc.h"
0c9ec4be 56#include "fsmap.h"
ac27a0ec 57
9bffad1e
TT		 58#define CREATE_TRACE_POINTS
59#include <trace/events/ext4.h>
60
0b75a840
LC		 61static struct ext4_lazy_init *ext4_li_info;
62static struct mutex ext4_li_mtx;
e294a537 63static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 64
617ba13b 65static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 66 unsigned long journal_devnum);
2adf6da8 67static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 68static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 69static void ext4_mark_recovery_complete(struct super_block *sb,
70 struct ext4_super_block *es);
71static void ext4_clear_journal_err(struct super_block *sb,
72 struct ext4_super_block *es);
617ba13b 73static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
c6cb7e77
EW		 86static struct inode *ext4_get_journal_inode(struct super_block *sb,
87 unsigned int journal_inum);
ac27a0ec 88
e74031fd
JK		 89/*
90 * Lock ordering
91 *
92 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
93 * i_mmap_rwsem (inode->i_mmap_rwsem)!
94 *
95 * page fault path:
c1e8d7c6 96 * mmap_lock -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
e74031fd
JK		 97 * page lock -> i_data_sem (rw)
98 *
99 * buffered write path:
c1e8d7c6 100 * sb_start_write -> i_mutex -> mmap_lock
e74031fd
JK		 101 * sb_start_write -> i_mutex -> transaction start -> page lock ->
102 * i_data_sem (rw)
103 *
104 * truncate:
1d39834f
NB		 105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
106 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
107 * i_data_sem (rw)
e74031fd
JK		 108 *
109 * direct IO:
c1e8d7c6 110 * sb_start_write -> i_mutex -> mmap_lock
1d39834f 111 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
e74031fd
JK		 112 *
113 * writepages:
114 * transaction start -> page lock(s) -> i_data_sem (rw)
115 */
116
c290ea01 117#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 118static struct file_system_type ext2_fs_type = {
119 .owner = THIS_MODULE,
120 .name = "ext2",
121 .mount = ext4_mount,
122 .kill_sb = kill_block_super,
123 .fs_flags = FS_REQUIRES_DEV,
124};
7f78e035 125MODULE_ALIAS_FS("ext2");
fa7614dd 126MODULE_ALIAS("ext2");
2035e776
TT		 127#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
128#else
129#define IS_EXT2_SB(sb) (0)
130#endif
131
132
ba69f9ab
JK		 133static struct file_system_type ext3_fs_type = {
134 .owner = THIS_MODULE,
135 .name = "ext3",
152a0836 136 .mount = ext4_mount,
ba69f9ab
JK		 137 .kill_sb = kill_block_super,
138 .fs_flags = FS_REQUIRES_DEV,
139};
7f78e035 140MODULE_ALIAS_FS("ext3");
fa7614dd 141MODULE_ALIAS("ext3");
ba69f9ab 142#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 143
fb265c9c
TT		 144/*
145 * This works like sb_bread() except it uses ERR_PTR for error
146 * returns. Currently with sb_bread it's impossible to distinguish
147 * between ENOMEM and EIO situations (since both result in a NULL
148 * return.
149 */
150struct buffer_head *
151ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
152{
153 struct buffer_head *bh = sb_getblk(sb, block);
154
155 if (bh == NULL)
156 return ERR_PTR(-ENOMEM);
cf2834a5 157 if (ext4_buffer_uptodate(bh))
fb265c9c
TT		 158 return bh;
159 ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
160 wait_on_buffer(bh);
161 if (buffer_uptodate(bh))
162 return bh;
163 put_bh(bh);
164 return ERR_PTR(-EIO);
165}
166
d25425f8
DW		 167static int ext4_verify_csum_type(struct super_block *sb,
168 struct ext4_super_block *es)
169{
e2b911c5 170 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 171 return 1;
172
173 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
174}
175
a9c47317
DW		 176static __le32 ext4_superblock_csum(struct super_block *sb,
177 struct ext4_super_block *es)
178{
179 struct ext4_sb_info *sbi = EXT4_SB(sb);
180 int offset = offsetof(struct ext4_super_block, s_checksum);
181 __u32 csum;
182
183 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
184
185 return cpu_to_le32(csum);
186}
187
c197855e
SH		 188static int ext4_superblock_csum_verify(struct super_block *sb,
189 struct ext4_super_block *es)
a9c47317 190{
9aa5d32b 191 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 192 return 1;
193
194 return es->s_checksum == ext4_superblock_csum(sb, es);
195}
196
06db49e6 197void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 198{
06db49e6
TT		 199 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
200
9aa5d32b 201 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 202 return;
203
204 es->s_checksum = ext4_superblock_csum(sb, es);
205}
206
8fadc143
AR		 207ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
208 struct ext4_group_desc *bg)
bd81d8ee 209{
3a14589c 210 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 211 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 212 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 213}
214
8fadc143
AR		 215ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
216 struct ext4_group_desc *bg)
bd81d8ee 217{
5272f837 218 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 219 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 220 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 221}
222
8fadc143
AR		 223ext4_fsblk_t ext4_inode_table(struct super_block *sb,
224 struct ext4_group_desc *bg)
bd81d8ee 225{
5272f837 226 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 227 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 228 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 229}
230
021b65bb
TT		 231__u32 ext4_free_group_clusters(struct super_block *sb,
232 struct ext4_group_desc *bg)
560671a0
AK		 233{
234 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
235 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 236 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 237}
238
239__u32 ext4_free_inodes_count(struct super_block *sb,
240 struct ext4_group_desc *bg)
241{
242 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
243 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 244 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 245}
246
247__u32 ext4_used_dirs_count(struct super_block *sb,
248 struct ext4_group_desc *bg)
249{
250 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
251 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 252 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 253}
254
255__u32 ext4_itable_unused_count(struct super_block *sb,
256 struct ext4_group_desc *bg)
257{
258 return le16_to_cpu(bg->bg_itable_unused_lo) |
259 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 260 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 261}
262
8fadc143
AR		 263void ext4_block_bitmap_set(struct super_block *sb,
264 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 265{
3a14589c 266 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 267 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
268 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 269}
270
8fadc143
AR		 271void ext4_inode_bitmap_set(struct super_block *sb,
272 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 273{
5272f837 274 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 275 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
276 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 277}
278
8fadc143
AR		 279void ext4_inode_table_set(struct super_block *sb,
280 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 281{
5272f837 282 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 283 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
284 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 285}
286
021b65bb
TT		 287void ext4_free_group_clusters_set(struct super_block *sb,
288 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 289{
290 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
291 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
292 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
293}
294
295void ext4_free_inodes_set(struct super_block *sb,
296 struct ext4_group_desc *bg, __u32 count)
297{
298 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
299 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
300 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
301}
302
303void ext4_used_dirs_set(struct super_block *sb,
304 struct ext4_group_desc *bg, __u32 count)
305{
306 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
307 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
308 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
309}
310
311void ext4_itable_unused_set(struct super_block *sb,
312 struct ext4_group_desc *bg, __u32 count)
313{
314 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
315 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
316 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
317}
318
6a0678a7
AB		 319static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
320{
321 time64_t now = ktime_get_real_seconds();
322
323 now = clamp_val(now, 0, (1ull << 40) - 1);
324
325 *lo = cpu_to_le32(lower_32_bits(now));
326 *hi = upper_32_bits(now);
327}
328
329static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
330{
331 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
332}
333#define ext4_update_tstamp(es, tstamp) \
334 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
335#define ext4_get_tstamp(es, tstamp) \
336 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
d3d1faf6 337
54d3adbc
TT		 338static void __save_error_info(struct super_block *sb, int error,
339 __u32 ino, __u64 block,
340 const char *func, unsigned int line)
1c13d5c0
TT		 341{
342 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
54d3adbc 343 int err;
1c13d5c0
TT		 344
345 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 346 if (bdev_read_only(sb->s_bdev))
347 return;
1c13d5c0 348 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6a0678a7 349 ext4_update_tstamp(es, s_last_error_time);
1c13d5c0
TT		 350 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
351 es->s_last_error_line = cpu_to_le32(line);
54d3adbc
TT		 352 es->s_last_error_ino = cpu_to_le32(ino);
353 es->s_last_error_block = cpu_to_le64(block);
354 switch (error) {
355 case EIO:
356 err = EXT4_ERR_EIO;
357 break;
358 case ENOMEM:
359 err = EXT4_ERR_ENOMEM;
360 break;
361 case EFSBADCRC:
362 err = EXT4_ERR_EFSBADCRC;
363 break;
364 case 0:
365 case EFSCORRUPTED:
366 err = EXT4_ERR_EFSCORRUPTED;
367 break;
368 case ENOSPC:
369 err = EXT4_ERR_ENOSPC;
370 break;
371 case ENOKEY:
372 err = EXT4_ERR_ENOKEY;
373 break;
374 case EROFS:
375 err = EXT4_ERR_EROFS;
376 break;
377 case EFBIG:
378 err = EXT4_ERR_EFBIG;
379 break;
380 case EEXIST:
381 err = EXT4_ERR_EEXIST;
382 break;
383 case ERANGE:
384 err = EXT4_ERR_ERANGE;
385 break;
386 case EOVERFLOW:
387 err = EXT4_ERR_EOVERFLOW;
388 break;
389 case EBUSY:
390 err = EXT4_ERR_EBUSY;
391 break;
392 case ENOTDIR:
393 err = EXT4_ERR_ENOTDIR;
394 break;
395 case ENOTEMPTY:
396 err = EXT4_ERR_ENOTEMPTY;
397 break;
398 case ESHUTDOWN:
399 err = EXT4_ERR_ESHUTDOWN;
400 break;
401 case EFAULT:
402 err = EXT4_ERR_EFAULT;
403 break;
404 default:
405 err = EXT4_ERR_UNKNOWN;
406 }
407 es->s_last_error_errcode = err;
1c13d5c0
TT		 408 if (!es->s_first_error_time) {
409 es->s_first_error_time = es->s_last_error_time;
6a0678a7 410 es->s_first_error_time_hi = es->s_last_error_time_hi;
1c13d5c0
TT		 411 strncpy(es->s_first_error_func, func,
412 sizeof(es->s_first_error_func));
413 es->s_first_error_line = cpu_to_le32(line);
414 es->s_first_error_ino = es->s_last_error_ino;
415 es->s_first_error_block = es->s_last_error_block;
878520ac 416 es->s_first_error_errcode = es->s_last_error_errcode;
1c13d5c0 417 }
66e61a9e
TT		 418 /*
419 * Start the daily error reporting function if it hasn't been
420 * started already
421 */
422 if (!es->s_error_count)
423 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 424 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 425}
426
54d3adbc
TT		 427static void save_error_info(struct super_block *sb, int error,
428 __u32 ino, __u64 block,
429 const char *func, unsigned int line)
1c13d5c0 430{
54d3adbc 431 __save_error_info(sb, error, ino, block, func, line);
c96e2b85
ES		 432 if (!bdev_read_only(sb->s_bdev))
433 ext4_commit_super(sb, 1);
1c13d5c0
TT		 434}
435
bdfe0cbd
TT		 436/*
437 * The del_gendisk() function uninitializes the disk-specific data
438 * structures, including the bdi structure, without telling anyone
439 * else. Once this happens, any attempt to call mark_buffer_dirty()
440 * (for example, by ext4_commit_super), will cause a kernel OOPS.
441 * This is a kludge to prevent these oops until we can put in a proper
442 * hook in del_gendisk() to inform the VFS and file system layers.
443 */
444static int block_device_ejected(struct super_block *sb)
445{
446 struct inode *bd_inode = sb->s_bdev->bd_inode;
447 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
448
449 return bdi->dev == NULL;
450}
451
18aadd47
BJ		 452static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
453{
454 struct super_block *sb = journal->j_private;
455 struct ext4_sb_info *sbi = EXT4_SB(sb);
456 int error = is_journal_aborted(journal);
5d3ee208 457 struct ext4_journal_cb_entry *jce;
18aadd47 458
5d3ee208 459 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 460
461 ext4_process_freed_data(sb, txn->t_tid);
462
18aadd47 463 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 464 while (!list_empty(&txn->t_private_list)) {
465 jce = list_entry(txn->t_private_list.next,
466 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 467 list_del_init(&jce->jce_list);
468 spin_unlock(&sbi->s_md_lock);
469 jce->jce_func(sb, jce, error);
470 spin_lock(&sbi->s_md_lock);
471 }
472 spin_unlock(&sbi->s_md_lock);
473}
1c13d5c0 474
1dc1097f
JK		 475static bool system_going_down(void)
476{
477 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
478 || system_state == SYSTEM_RESTART;
479}
480
ac27a0ec
DK		 481/* Deal with the reporting of failure conditions on a filesystem such as
482 * inconsistencies detected or read IO failures.
483 *
484 * On ext2, we can store the error state of the filesystem in the
617ba13b 485 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 486 * write ordering constraints on the superblock which prevent us from
487 * writing it out straight away; and given that the journal is about to
488 * be aborted, we can't rely on the current, or future, transactions to
489 * write out the superblock safely.
490 *
dab291af 491 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 492 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 493 * that error until we've noted it down and cleared it.
494 */
495
617ba13b 496static void ext4_handle_error(struct super_block *sb)
ac27a0ec 497{
327eaf73
TT		 498 if (test_opt(sb, WARN_ON_ERROR))
499 WARN_ON_ONCE(1);
500
bc98a42c 501 if (sb_rdonly(sb))
ac27a0ec
DK		 502 return;
503
2b2d6d01 504 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 505 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 506
4ab2f15b 507 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 508 if (journal)
dab291af 509 jbd2_journal_abort(journal, -EIO);
ac27a0ec 510 }
1dc1097f
JK		 511 /*
512 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
513 * could panic during 'reboot -f' as the underlying device got already
514 * disabled.
515 */
516 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
b31e1552 517 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 518 /*
519 * Make sure updated value of ->s_mount_flags will be visible
520 * before ->s_flags update
521 */
522 smp_wmb();
1751e8a6 523 sb->s_flags |= SB_RDONLY;
1dc1097f 524 } else if (test_opt(sb, ERRORS_PANIC)) {
4327ba52
DJ		 525 if (EXT4_SB(sb)->s_journal &&
526 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
527 return;
617ba13b 528 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 529 sb->s_id);
4327ba52 530 }
ac27a0ec
DK		 531}
532
efbed4dc
TT		 533#define ext4_error_ratelimit(sb) \
534 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
535 "EXT4-fs error")
536
12062ddd 537void __ext4_error(struct super_block *sb, const char *function,
54d3adbc
TT		 538 unsigned int line, int error, __u64 block,
539 const char *fmt, ...)
ac27a0ec 540{
0ff2ea7d 541 struct va_format vaf;
ac27a0ec
DK		 542 va_list args;
543
0db1ff22
TT		 544 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
545 return;
546
ccf0f32a 547 trace_ext4_error(sb, function, line);
efbed4dc
TT		 548 if (ext4_error_ratelimit(sb)) {
549 va_start(args, fmt);
550 vaf.fmt = fmt;
551 vaf.va = &args;
552 printk(KERN_CRIT
553 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
554 sb->s_id, function, line, current->comm, &vaf);
555 va_end(args);
556 }
54d3adbc 557 save_error_info(sb, error, 0, block, function, line);
617ba13b 558 ext4_handle_error(sb);
ac27a0ec
DK		 559}
560
e7c96e8e 561void __ext4_error_inode(struct inode *inode, const char *function,
54d3adbc 562 unsigned int line, ext4_fsblk_t block, int error,
e7c96e8e 563 const char *fmt, ...)
273df556
FM		 564{
565 va_list args;
f7c21177 566 struct va_format vaf;
273df556 567
0db1ff22
TT		 568 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
569 return;
570
ccf0f32a 571 trace_ext4_error(inode->i_sb, function, line);
efbed4dc
TT		 572 if (ext4_error_ratelimit(inode->i_sb)) {
573 va_start(args, fmt);
574 vaf.fmt = fmt;
575 vaf.va = &args;
576 if (block)
577 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
578 "inode #%lu: block %llu: comm %s: %pV\n",
579 inode->i_sb->s_id, function, line, inode->i_ino,
580 block, current->comm, &vaf);
581 else
582 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
583 "inode #%lu: comm %s: %pV\n",
584 inode->i_sb->s_id, function, line, inode->i_ino,
585 current->comm, &vaf);
586 va_end(args);
587 }
54d3adbc
TT		 588 save_error_info(inode->i_sb, error, inode->i_ino, block,
589 function, line);
273df556
FM		 590 ext4_handle_error(inode->i_sb);
591}
592
e7c96e8e
JP		 593void __ext4_error_file(struct file *file, const char *function,
594 unsigned int line, ext4_fsblk_t block,
595 const char *fmt, ...)
273df556
FM		 596{
597 va_list args;
f7c21177 598 struct va_format vaf;
496ad9aa 599 struct inode *inode = file_inode(file);
273df556
FM		 600 char pathname[80], *path;
601
0db1ff22
TT		 602 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
603 return;
604
ccf0f32a 605 trace_ext4_error(inode->i_sb, function, line);
efbed4dc 606 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 607 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 608 if (IS_ERR(path))
609 path = "(unknown)";
610 va_start(args, fmt);
611 vaf.fmt = fmt;
612 vaf.va = &args;
613 if (block)
614 printk(KERN_CRIT
615 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
616 "block %llu: comm %s: path %s: %pV\n",
617 inode->i_sb->s_id, function, line, inode->i_ino,
618 block, current->comm, path, &vaf);
619 else
620 printk(KERN_CRIT
621 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
622 "comm %s: path %s: %pV\n",
623 inode->i_sb->s_id, function, line, inode->i_ino,
624 current->comm, path, &vaf);
625 va_end(args);
626 }
54d3adbc
TT		 627 save_error_info(inode->i_sb, EFSCORRUPTED, inode->i_ino, block,
628 function, line);
273df556
FM		 629 ext4_handle_error(inode->i_sb);
630}
631
722887dd
TT		 632const char *ext4_decode_error(struct super_block *sb, int errno,
633 char nbuf[16])
ac27a0ec
DK		 634{
635 char *errstr = NULL;
636
637 switch (errno) {
6a797d27
DW		 638 case -EFSCORRUPTED:
639 errstr = "Corrupt filesystem";
640 break;
641 case -EFSBADCRC:
642 errstr = "Filesystem failed CRC";
643 break;
ac27a0ec
DK		 644 case -EIO:
645 errstr = "IO failure";
646 break;
647 case -ENOMEM:
648 errstr = "Out of memory";
649 break;
650 case -EROFS:
78f1ddbb
TT		 651 if (!sb || (EXT4_SB(sb)->s_journal &&
652 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 653 errstr = "Journal has aborted";
654 else
655 errstr = "Readonly filesystem";
656 break;
657 default:
658 /* If the caller passed in an extra buffer for unknown
659 * errors, textualise them now. Else we just return
660 * NULL. */
661 if (nbuf) {
662 /* Check for truncated error codes... */
663 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
664 errstr = nbuf;
665 }
666 break;
667 }
668
669 return errstr;
670}
671
617ba13b 672/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 673 * automatically and invokes the appropriate error response. */
674
c398eda0
TT		 675void __ext4_std_error(struct super_block *sb, const char *function,
676 unsigned int line, int errno)
ac27a0ec
DK		 677{
678 char nbuf[16];
679 const char *errstr;
680
0db1ff22
TT		 681 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
682 return;
683
ac27a0ec
DK		 684 /* Special case: if the error is EROFS, and we're not already
685 * inside a transaction, then there's really no point in logging
686 * an error. */
bc98a42c 687 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 688 return;
689
efbed4dc
TT		 690 if (ext4_error_ratelimit(sb)) {
691 errstr = ext4_decode_error(sb, errno, nbuf);
692 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
693 sb->s_id, function, line, errstr);
694 }
ac27a0ec 695
54d3adbc 696 save_error_info(sb, -errno, 0, 0, function, line);
617ba13b 697 ext4_handle_error(sb);
ac27a0ec
DK		 698}
699
700/*
617ba13b 701 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 702 * abort function may be used to deal with unrecoverable failures such
703 * as journal IO errors or ENOMEM at a critical moment in log management.
704 *
705 * We unconditionally force the filesystem into an ABORT|READONLY state,
706 * unless the error response on the fs has been set to panic in which
707 * case we take the easy way out and panic immediately.
708 */
709
c67d859e 710void __ext4_abort(struct super_block *sb, const char *function,
54d3adbc 711 unsigned int line, int error, const char *fmt, ...)
ac27a0ec 712{
651e1c3b 713 struct va_format vaf;
ac27a0ec
DK		 714 va_list args;
715
0db1ff22
TT		 716 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
717 return;
718
54d3adbc 719 save_error_info(sb, error, 0, 0, function, line);
ac27a0ec 720 va_start(args, fmt);
651e1c3b
JP		 721 vaf.fmt = fmt;
722 vaf.va = &args;
723 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
724 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 725 va_end(args);
726
bc98a42c 727 if (sb_rdonly(sb) == 0) {
1c13d5c0 728 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 729 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 730 /*
731 * Make sure updated value of ->s_mount_flags will be visible
732 * before ->s_flags update
733 */
734 smp_wmb();
1751e8a6 735 sb->s_flags |= SB_RDONLY;
1c13d5c0
TT		 736 if (EXT4_SB(sb)->s_journal)
737 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
1c13d5c0 738 }
2c1d0e36 739 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
4327ba52
DJ		 740 if (EXT4_SB(sb)->s_journal &&
741 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
742 return;
617ba13b 743 panic("EXT4-fs panic from previous error\n");
4327ba52 744 }
ac27a0ec
DK		 745}
746
e7c96e8e
JP		 747void __ext4_msg(struct super_block *sb,
748 const char *prefix, const char *fmt, ...)
b31e1552 749{
0ff2ea7d 750 struct va_format vaf;
b31e1552
ES		 751 va_list args;
752
efbed4dc
TT		 753 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
754 return;
755
b31e1552 756 va_start(args, fmt);
0ff2ea7d
JP		 757 vaf.fmt = fmt;
758 vaf.va = &args;
759 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 760 va_end(args);
761}
762
b03a2f7e
AD		 763#define ext4_warning_ratelimit(sb) \
764 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
765 "EXT4-fs warning")
766
12062ddd 767void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 768 unsigned int line, const char *fmt, ...)
ac27a0ec 769{
0ff2ea7d 770 struct va_format vaf;
ac27a0ec
DK		 771 va_list args;
772
b03a2f7e 773 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 774 return;
775
ac27a0ec 776 va_start(args, fmt);
0ff2ea7d
JP		 777 vaf.fmt = fmt;
778 vaf.va = &args;
779 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
780 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 781 va_end(args);
782}
783
b03a2f7e
AD		 784void __ext4_warning_inode(const struct inode *inode, const char *function,
785 unsigned int line, const char *fmt, ...)
786{
787 struct va_format vaf;
788 va_list args;
789
790 if (!ext4_warning_ratelimit(inode->i_sb))
791 return;
792
793 va_start(args, fmt);
794 vaf.fmt = fmt;
795 vaf.va = &args;
796 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
797 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
798 function, line, inode->i_ino, current->comm, &vaf);
799 va_end(args);
800}
801
e29136f8
TT		 802void __ext4_grp_locked_error(const char *function, unsigned int line,
803 struct super_block *sb, ext4_group_t grp,
804 unsigned long ino, ext4_fsblk_t block,
805 const char *fmt, ...)
5d1b1b3f
AK		 806__releases(bitlock)
807__acquires(bitlock)
808{
0ff2ea7d 809 struct va_format vaf;
5d1b1b3f 810 va_list args;
5d1b1b3f 811
0db1ff22
TT		 812 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
813 return;
814
ccf0f32a 815 trace_ext4_error(sb, function, line);
54d3adbc 816 __save_error_info(sb, EFSCORRUPTED, ino, block, function, line);
0ff2ea7d 817
efbed4dc
TT		 818 if (ext4_error_ratelimit(sb)) {
819 va_start(args, fmt);
820 vaf.fmt = fmt;
821 vaf.va = &args;
822 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
823 sb->s_id, function, line, grp);
824 if (ino)
825 printk(KERN_CONT "inode %lu: ", ino);
826 if (block)
827 printk(KERN_CONT "block %llu:",
828 (unsigned long long) block);
829 printk(KERN_CONT "%pV\n", &vaf);
830 va_end(args);
831 }
5d1b1b3f 832
327eaf73
TT		 833 if (test_opt(sb, WARN_ON_ERROR))
834 WARN_ON_ONCE(1);
835
5d1b1b3f 836 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 837 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 838 return;
839 }
1c13d5c0 840
5d1b1b3f 841 ext4_unlock_group(sb, grp);
06f29cc8 842 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 843 ext4_handle_error(sb);
844 /*
845 * We only get here in the ERRORS_RO case; relocking the group
846 * may be dangerous, but nothing bad will happen since the
847 * filesystem will have already been marked read/only and the
848 * journal has been aborted. We return 1 as a hint to callers
849 * who might what to use the return value from
25985edc 850 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 851 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
852 * aggressively from the ext4 function in question, with a
853 * more appropriate error code.
854 */
855 ext4_lock_group(sb, grp);
856 return;
857}
858
db79e6d1
WS		 859void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
860 ext4_group_t group,
861 unsigned int flags)
862{
863 struct ext4_sb_info *sbi = EXT4_SB(sb);
864 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
865 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
9af0b3d1
WS		 866 int ret;
867
868 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
869 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
870 &grp->bb_state);
871 if (!ret)
872 percpu_counter_sub(&sbi->s_freeclusters_counter,
873 grp->bb_free);
db79e6d1
WS		 874 }
875
9af0b3d1
WS		 876 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
877 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
878 &grp->bb_state);
879 if (!ret && gdp) {
db79e6d1
WS		 880 int count;
881
882 count = ext4_free_inodes_count(sb, gdp);
883 percpu_counter_sub(&sbi->s_freeinodes_counter,
884 count);
885 }
db79e6d1
WS		 886 }
887}
888
617ba13b 889void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 890{
617ba13b 891 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 892
617ba13b 893 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 894 return;
895
12062ddd 896 ext4_warning(sb,
ac27a0ec
DK		 897 "updating to rev %d because of new feature flag, "
898 "running e2fsck is recommended",
617ba13b 899 EXT4_DYNAMIC_REV);
ac27a0ec 900
617ba13b
MC		 901 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
902 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
903 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 904 /* leave es->s_feature_*compat flags alone */
905 /* es->s_uuid will be set by e2fsck if empty */
906
907 /*
908 * The rest of the superblock fields should be zero, and if not it
909 * means they are likely already in use, so leave them alone. We
910 * can leave it up to e2fsck to clean up any inconsistencies there.
911 */
912}
913
914/*
915 * Open the external journal device
916 */
b31e1552 917static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 918{
919 struct block_device *bdev;
ac27a0ec 920
d4d77629 921 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 922 if (IS_ERR(bdev))
923 goto fail;
924 return bdev;
925
926fail:
ea3edd4d
CH		 927 ext4_msg(sb, KERN_ERR,
928 "failed to open journal device unknown-block(%u,%u) %ld",
929 MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
ac27a0ec
DK		 930 return NULL;
931}
932
933/*
934 * Release the journal device
935 */
4385bab1 936static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 937{
4385bab1 938 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 939}
940
4385bab1 941static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 942{
943 struct block_device *bdev;
ac27a0ec
DK		 944 bdev = sbi->journal_bdev;
945 if (bdev) {
4385bab1 946 ext4_blkdev_put(bdev);
ac27a0ec
DK		 947 sbi->journal_bdev = NULL;
948 }
ac27a0ec
DK		 949}
950
951static inline struct inode *orphan_list_entry(struct list_head *l)
952{
617ba13b 953 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 954}
955
617ba13b 956static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 957{
958 struct list_head *l;
959
b31e1552
ES		 960 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
961 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 962
963 printk(KERN_ERR "sb_info orphan list:\n");
964 list_for_each(l, &sbi->s_orphan) {
965 struct inode *inode = orphan_list_entry(l);
966 printk(KERN_ERR " "
967 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
968 inode->i_sb->s_id, inode->i_ino, inode,
969 inode->i_mode, inode->i_nlink,
970 NEXT_ORPHAN(inode));
971 }
972}
973
957153fc
JK		 974#ifdef CONFIG_QUOTA
975static int ext4_quota_off(struct super_block *sb, int type);
976
977static inline void ext4_quota_off_umount(struct super_block *sb)
978{
979 int type;
980
964edf66
JK		 981 /* Use our quota_off function to clear inode flags etc. */
982 for (type = 0; type < EXT4_MAXQUOTAS; type++)
983 ext4_quota_off(sb, type);
957153fc 984}
33458eab
TT		 985
986/*
987 * This is a helper function which is used in the mount/remount
988 * codepaths (which holds s_umount) to fetch the quota file name.
989 */
990static inline char *get_qf_name(struct super_block *sb,
991 struct ext4_sb_info *sbi,
992 int type)
993{
994 return rcu_dereference_protected(sbi->s_qf_names[type],
995 lockdep_is_held(&sb->s_umount));
996}
957153fc
JK		 997#else
998static inline void ext4_quota_off_umount(struct super_block *sb)
999{
1000}
1001#endif
1002
2b2d6d01 1003static void ext4_put_super(struct super_block *sb)
ac27a0ec 1004{
617ba13b
MC		 1005 struct ext4_sb_info *sbi = EXT4_SB(sb);
1006 struct ext4_super_block *es = sbi->s_es;
1d0c3924 1007 struct buffer_head **group_desc;
7c990728 1008 struct flex_groups **flex_groups;
97abd7d4 1009 int aborted = 0;
ef2cabf7 1010 int i, err;
ac27a0ec 1011
857ac889 1012 ext4_unregister_li_request(sb);
957153fc 1013 ext4_quota_off_umount(sb);
e0ccfd95 1014
2e8fa54e 1015 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 1016
5e47868f
RH		 1017 /*
1018 * Unregister sysfs before destroying jbd2 journal.
1019 * Since we could still access attr_journal_task attribute via sysfs
1020 * path which could have sbi->s_journal->j_task as NULL
1021 */
1022 ext4_unregister_sysfs(sb);
1023
0390131b 1024 if (sbi->s_journal) {
97abd7d4 1025 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 1026 err = jbd2_journal_destroy(sbi->s_journal);
1027 sbi->s_journal = NULL;
878520ac 1028 if ((err < 0) && !aborted) {
54d3adbc 1029 ext4_abort(sb, -err, "Couldn't clean up the journal");
878520ac 1030 }
0390131b 1031 }
d4edac31 1032
d3922a77 1033 ext4_es_unregister_shrinker(sbi);
9105bb14 1034 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 1035 ext4_release_system_zone(sb);
1036 ext4_mb_release(sb);
1037 ext4_ext_release(sb);
d4edac31 1038
bc98a42c 1039 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 1040 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 1041 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 1042 }
bc98a42c 1043 if (!sb_rdonly(sb))
a8e25a83
AB		 1044 ext4_commit_super(sb, 1);
1045
1d0c3924
TT		 1046 rcu_read_lock();
1047 group_desc = rcu_dereference(sbi->s_group_desc);
ac27a0ec 1048 for (i = 0; i < sbi->s_gdb_count; i++)
1d0c3924
TT		 1049 brelse(group_desc[i]);
1050 kvfree(group_desc);
7c990728
SJS		 1051 flex_groups = rcu_dereference(sbi->s_flex_groups);
1052 if (flex_groups) {
1053 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1054 kvfree(flex_groups[i]);
1055 kvfree(flex_groups);
1056 }
1d0c3924 1057 rcu_read_unlock();
57042651 1058 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 1059 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1060 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 1061 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
bbd55937 1062 percpu_free_rwsem(&sbi->s_writepages_rwsem);
ac27a0ec 1063#ifdef CONFIG_QUOTA
a2d4a646 1064 for (i = 0; i < EXT4_MAXQUOTAS; i++)
33458eab 1065 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 1066#endif
1067
1068 /* Debugging code just in case the in-memory inode orphan list
1069 * isn't empty. The on-disk one can be non-empty if we've
1070 * detected an error and taken the fs readonly, but the
1071 * in-memory list had better be clean by this point. */
1072 if (!list_empty(&sbi->s_orphan))
1073 dump_orphan_list(sb, sbi);
1074 J_ASSERT(list_empty(&sbi->s_orphan));
1075
89d96a6f 1076 sync_blockdev(sb->s_bdev);
f98393a6 1077 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 1078 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1079 /*
1080 * Invalidate the journal device's buffers. We don't want them
1081 * floating about in memory - the physical journal device may
1082 * hotswapped, and it breaks the `ro-after' testing code.
1083 */
1084 sync_blockdev(sbi->journal_bdev);
f98393a6 1085 invalidate_bdev(sbi->journal_bdev);
617ba13b 1086 ext4_blkdev_remove(sbi);
ac27a0ec 1087 }
50c15df6
CX		 1088
1089 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1090 sbi->s_ea_inode_cache = NULL;
1091
1092 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1093 sbi->s_ea_block_cache = NULL;
1094
c5e06d10
JL		 1095 if (sbi->s_mmp_tsk)
1096 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 1097 brelse(sbi->s_sbh);
ac27a0ec 1098 sb->s_fs_info = NULL;
3197ebdb
TT		 1099 /*
1100 * Now that we are completely done shutting down the
1101 * superblock, we need to actually destroy the kobject.
1102 */
3197ebdb
TT		 1103 kobject_put(&sbi->s_kobj);
1104 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1105 if (sbi->s_chksum_driver)
1106 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1107 kfree(sbi->s_blockgroup_lock);
5e405595 1108 fs_put_dax(sbi->s_daxdev);
ed318a6c 1109 fscrypt_free_dummy_context(&sbi->s_dummy_enc_ctx);
c83ad55e
GKB		 1110#ifdef CONFIG_UNICODE
1111 utf8_unload(sbi->s_encoding);
1112#endif
ac27a0ec 1113 kfree(sbi);
ac27a0ec
DK		 1114}
1115
e18b890b 1116static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1117
1118/*
1119 * Called inside transaction, so use GFP_NOFS
1120 */
617ba13b 1121static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1122{
617ba13b 1123 struct ext4_inode_info *ei;
ac27a0ec 1124
e6b4f8da 1125 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1126 if (!ei)
1127 return NULL;
0b8e58a1 1128
ee73f9a5 1129 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 1130 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 1131 INIT_LIST_HEAD(&ei->i_prealloc_list);
1132 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1133 ext4_es_init_tree(&ei->i_es_tree);
1134 rwlock_init(&ei->i_es_lock);
edaa53ca 1135 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1136 ei->i_es_all_nr = 0;
edaa53ca 1137 ei->i_es_shk_nr = 0;
dd475925 1138 ei->i_es_shrink_lblk = 0;
d2a17637 1139 ei->i_reserved_data_blocks = 0;
d2a17637 1140 spin_lock_init(&(ei->i_block_reservation_lock));
1dc0aa46 1141 ext4_init_pending_tree(&ei->i_pending_tree);
a9e7f447
DM		 1142#ifdef CONFIG_QUOTA
1143 ei->i_reserved_quota = 0;
96c7e0d9 1144 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1145#endif
8aefcd55 1146 ei->jinode = NULL;
2e8fa54e 1147 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1148 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1149 ei->i_sync_tid = 0;
1150 ei->i_datasync_tid = 0;
e27f41e1 1151 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1152 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 1153 return &ei->vfs_inode;
1154}
1155
7ff9c073
TT		 1156static int ext4_drop_inode(struct inode *inode)
1157{
1158 int drop = generic_drop_inode(inode);
1159
29b3692e
EB		 1160 if (!drop)
1161 drop = fscrypt_drop_inode(inode);
1162
7ff9c073
TT		 1163 trace_ext4_drop_inode(inode, drop);
1164 return drop;
1165}
1166
94053139 1167static void ext4_free_in_core_inode(struct inode *inode)
fa0d7e3d 1168{
2c58d548 1169 fscrypt_free_inode(inode);
fa0d7e3d
NP		 1170 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1171}
1172
617ba13b 1173static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1174{
9f7dd93d 1175 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1176 ext4_msg(inode->i_sb, KERN_ERR,
1177 "Inode %lu (%p): orphan list check failed!",
1178 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1179 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1180 EXT4_I(inode), sizeof(struct ext4_inode_info),
1181 true);
1182 dump_stack();
1183 }
ac27a0ec
DK		 1184}
1185
51cc5068 1186static void init_once(void *foo)
ac27a0ec 1187{
617ba13b 1188 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1189
a35afb83 1190 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1191 init_rwsem(&ei->xattr_sem);
0e855ac8 1192 init_rwsem(&ei->i_data_sem);
ea3d7209 1193 init_rwsem(&ei->i_mmap_sem);
a35afb83 1194 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1195}
1196
e67bc2b3 1197static int __init init_inodecache(void)
ac27a0ec 1198{
f8dd7c70
DW		 1199 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1200 sizeof(struct ext4_inode_info), 0,
1201 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1202 SLAB_ACCOUNT),
1203 offsetof(struct ext4_inode_info, i_data),
1204 sizeof_field(struct ext4_inode_info, i_data),
1205 init_once);
617ba13b 1206 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1207 return -ENOMEM;
1208 return 0;
1209}
1210
1211static void destroy_inodecache(void)
1212{
8c0a8537
KS		 1213 /*
1214 * Make sure all delayed rcu free inodes are flushed before we
1215 * destroy cache.
1216 */
1217 rcu_barrier();
617ba13b 1218 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1219}
1220
0930fcc1 1221void ext4_clear_inode(struct inode *inode)
ac27a0ec 1222{
0930fcc1 1223 invalidate_inode_buffers(inode);
dbd5768f 1224 clear_inode(inode);
c2ea3fde 1225 ext4_discard_preallocations(inode);
51865fda 1226 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
f4c2d372 1227 dquot_drop(inode);
8aefcd55
TT		 1228 if (EXT4_I(inode)->jinode) {
1229 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1230 EXT4_I(inode)->jinode);
1231 jbd2_free_inode(EXT4_I(inode)->jinode);
1232 EXT4_I(inode)->jinode = NULL;
1233 }
3d204e24 1234 fscrypt_put_encryption_info(inode);
c93d8f88 1235 fsverity_cleanup_inode(inode);
ac27a0ec
DK		 1236}
1237
1b961ac0 1238static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1239 u64 ino, u32 generation)
ac27a0ec 1240{
ac27a0ec 1241 struct inode *inode;
ac27a0ec 1242
8a363970 1243 /*
ac27a0ec
DK		 1244 * Currently we don't know the generation for parent directory, so
1245 * a generation of 0 means "accept any"
1246 */
8a363970 1247 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1248 if (IS_ERR(inode))
1249 return ERR_CAST(inode);
1250 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1251 iput(inode);
1252 return ERR_PTR(-ESTALE);
1253 }
1b961ac0
CH		 1254
1255 return inode;
1256}
1257
1258static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1259 int fh_len, int fh_type)
1b961ac0
CH		 1260{
1261 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1262 ext4_nfs_get_inode);
1263}
1264
1265static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1266 int fh_len, int fh_type)
1b961ac0
CH		 1267{
1268 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1269 ext4_nfs_get_inode);
ac27a0ec
DK		 1270}
1271
fde87268
TT		 1272static int ext4_nfs_commit_metadata(struct inode *inode)
1273{
1274 struct writeback_control wbc = {
1275 .sync_mode = WB_SYNC_ALL
1276 };
1277
1278 trace_ext4_nfs_commit_metadata(inode);
1279 return ext4_write_inode(inode, &wbc);
1280}
1281
c39a7f84
TO		 1282/*
1283 * Try to release metadata pages (indirect blocks, directories) which are
1284 * mapped via the block device. Since these pages could have journal heads
1285 * which would prevent try_to_free_buffers() from freeing them, we must use
1286 * jbd2 layer's try_to_free_buffers() function to release them.
1287 */
0b8e58a1
AD		 1288static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1289 gfp_t wait)
c39a7f84
TO		 1290{
1291 journal_t *journal = EXT4_SB(sb)->s_journal;
1292
1293 WARN_ON(PageChecked(page));
1294 if (!page_has_buffers(page))
1295 return 0;
1296 if (journal)
1297 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1298 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1299 return try_to_free_buffers(page);
1300}
1301
643fa961 1302#ifdef CONFIG_FS_ENCRYPTION
a7550b30
JK		 1303static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1304{
1305 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1306 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1307}
1308
a7550b30
JK		 1309static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1310 void *fs_data)
1311{
2f8f5e76 1312 handle_t *handle = fs_data;
c1a5d5f6 1313 int res, res2, credits, retries = 0;
2f8f5e76 1314
9ce0151a
EB		 1315 /*
1316 * Encrypting the root directory is not allowed because e2fsck expects
1317 * lost+found to exist and be unencrypted, and encrypting the root
1318 * directory would imply encrypting the lost+found directory as well as
1319 * the filename "lost+found" itself.
1320 */
1321 if (inode->i_ino == EXT4_ROOT_INO)
1322 return -EPERM;
2f8f5e76 1323
7d3e06a8
RZ		 1324 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1325 return -EINVAL;
1326
94840e3c
EB		 1327 res = ext4_convert_inline_data(inode);
1328 if (res)
1329 return res;
1330
2f8f5e76
EB		 1331 /*
1332 * If a journal handle was specified, then the encryption context is
1333 * being set on a new inode via inheritance and is part of a larger
1334 * transaction to create the inode. Otherwise the encryption context is
1335 * being set on an existing inode in its own transaction. Only in the
1336 * latter case should the "retry on ENOSPC" logic be used.
1337 */
a7550b30 1338
2f8f5e76
EB		 1339 if (handle) {
1340 res = ext4_xattr_set_handle(handle, inode,
1341 EXT4_XATTR_INDEX_ENCRYPTION,
1342 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1343 ctx, len, 0);
a7550b30
JK		 1344 if (!res) {
1345 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1346 ext4_clear_inode_state(inode,
1347 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1348 /*
2ee6a576
EB		 1349 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1350 * S_DAX may be disabled
a3caa24b
JK		 1351 */
1352 ext4_set_inode_flags(inode);
a7550b30
JK		 1353 }
1354 return res;
1355 }
1356
b8cb5a54
TE		 1357 res = dquot_initialize(inode);
1358 if (res)
1359 return res;
2f8f5e76 1360retry:
af65207c
TE		 1361 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1362 &credits);
dec214d0
TE		 1363 if (res)
1364 return res;
1365
c1a5d5f6 1366 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1367 if (IS_ERR(handle))
1368 return PTR_ERR(handle);
1369
2f8f5e76
EB		 1370 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1371 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1372 ctx, len, 0);
a7550b30
JK		 1373 if (!res) {
1374 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1375 /*
1376 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1377 * S_DAX may be disabled
1378 */
a3caa24b 1379 ext4_set_inode_flags(inode);
a7550b30
JK		 1380 res = ext4_mark_inode_dirty(handle, inode);
1381 if (res)
1382 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1383 }
1384 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1385
1386 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1387 goto retry;
a7550b30
JK		 1388 if (!res)
1389 res = res2;
1390 return res;
1391}
1392
ed318a6c
EB		 1393static const union fscrypt_context *
1394ext4_get_dummy_context(struct super_block *sb)
a7550b30 1395{
ed318a6c 1396 return EXT4_SB(sb)->s_dummy_enc_ctx.ctx;
a7550b30
JK		 1397}
1398
b925acb8
EB		 1399static bool ext4_has_stable_inodes(struct super_block *sb)
1400{
1401 return ext4_has_feature_stable_inodes(sb);
1402}
1403
1404static void ext4_get_ino_and_lblk_bits(struct super_block *sb,
1405 int *ino_bits_ret, int *lblk_bits_ret)
1406{
1407 *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count);
1408 *lblk_bits_ret = 8 * sizeof(ext4_lblk_t);
1409}
1410
6f69f0ed 1411static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1412 .key_prefix = "ext4:",
a7550b30 1413 .get_context = ext4_get_context,
a7550b30 1414 .set_context = ext4_set_context,
ed318a6c 1415 .get_dummy_context = ext4_get_dummy_context,
a7550b30 1416 .empty_dir = ext4_empty_dir,
e12ee683 1417 .max_namelen = EXT4_NAME_LEN,
b925acb8
EB		 1418 .has_stable_inodes = ext4_has_stable_inodes,
1419 .get_ino_and_lblk_bits = ext4_get_ino_and_lblk_bits,
a7550b30 1420};
a7550b30
JK		 1421#endif
1422
ac27a0ec 1423#ifdef CONFIG_QUOTA
d6006186 1424static const char * const quotatypes[] = INITQFNAMES;
689c958c 1425#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1426
617ba13b
MC		 1427static int ext4_write_dquot(struct dquot *dquot);
1428static int ext4_acquire_dquot(struct dquot *dquot);
1429static int ext4_release_dquot(struct dquot *dquot);
1430static int ext4_mark_dquot_dirty(struct dquot *dquot);
1431static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1432static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1433 const struct path *path);
617ba13b
MC		 1434static int ext4_quota_on_mount(struct super_block *sb, int type);
1435static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1436 size_t len, loff_t off);
617ba13b 1437static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1438 const char *data, size_t len, loff_t off);
7c319d32
AK		 1439static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1440 unsigned int flags);
1441static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1442
96c7e0d9
JK		 1443static struct dquot **ext4_get_dquots(struct inode *inode)
1444{
1445 return EXT4_I(inode)->i_dquot;
1446}
1447
61e225dc 1448static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1449 .get_reserved_space = ext4_get_reserved_space,
1450 .write_dquot = ext4_write_dquot,
1451 .acquire_dquot = ext4_acquire_dquot,
1452 .release_dquot = ext4_release_dquot,
1453 .mark_dirty = ext4_mark_dquot_dirty,
1454 .write_info = ext4_write_info,
1455 .alloc_dquot = dquot_alloc,
1456 .destroy_dquot = dquot_destroy,
1457 .get_projid = ext4_get_projid,
1458 .get_inode_usage = ext4_get_inode_usage,
ebc11f7b 1459 .get_next_id = dquot_get_next_id,
ac27a0ec
DK		 1460};
1461
0d54b217 1462static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1463 .quota_on = ext4_quota_on,
ca0e05e4 1464 .quota_off = ext4_quota_off,
287a8095 1465 .quota_sync = dquot_quota_sync,
0a240339 1466 .get_state = dquot_get_state,
287a8095
CH		 1467 .set_info = dquot_set_dqinfo,
1468 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1469 .set_dqblk = dquot_set_dqblk,
1470 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1471};
1472#endif
1473
ee9b6d61 1474static const struct super_operations ext4_sops = {
617ba13b 1475 .alloc_inode = ext4_alloc_inode,
94053139 1476 .free_inode = ext4_free_in_core_inode,
617ba13b 1477 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1478 .write_inode = ext4_write_inode,
1479 .dirty_inode = ext4_dirty_inode,
7ff9c073 1480 .drop_inode = ext4_drop_inode,
0930fcc1 1481 .evict_inode = ext4_evict_inode,
617ba13b 1482 .put_super = ext4_put_super,
617ba13b 1483 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1484 .freeze_fs = ext4_freeze,
1485 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1486 .statfs = ext4_statfs,
1487 .remount_fs = ext4_remount,
617ba13b 1488 .show_options = ext4_show_options,
ac27a0ec 1489#ifdef CONFIG_QUOTA
617ba13b
MC		 1490 .quota_read = ext4_quota_read,
1491 .quota_write = ext4_quota_write,
96c7e0d9 1492 .get_dquots = ext4_get_dquots,
ac27a0ec 1493#endif
c39a7f84 1494 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1495};
1496
39655164 1497static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1498 .fh_to_dentry = ext4_fh_to_dentry,
1499 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1500 .get_parent = ext4_get_parent,
fde87268 1501 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1502};
1503
1504enum {
1505 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1506 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1507 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1508 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1509 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1510 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1511 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1512 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1513 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1514 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1515 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1516 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1517 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
327eaf73
TT		 1518 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1519 Opt_nowarn_on_error, Opt_mblk_io_submit,
670e9875 1520 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1521 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1522 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1523 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1524 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1525 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
ac27a0ec
DK		 1526};
1527
a447c093 1528static const match_table_t tokens = {
ac27a0ec
DK		 1529 {Opt_bsd_df, "bsddf"},
1530 {Opt_minix_df, "minixdf"},
1531 {Opt_grpid, "grpid"},
1532 {Opt_grpid, "bsdgroups"},
1533 {Opt_nogrpid, "nogrpid"},
1534 {Opt_nogrpid, "sysvgroups"},
1535 {Opt_resgid, "resgid=%u"},
1536 {Opt_resuid, "resuid=%u"},
1537 {Opt_sb, "sb=%u"},
1538 {Opt_err_cont, "errors=continue"},
1539 {Opt_err_panic, "errors=panic"},
1540 {Opt_err_ro, "errors=remount-ro"},
1541 {Opt_nouid32, "nouid32"},
ac27a0ec 1542 {Opt_debug, "debug"},
72578c33
TT		 1543 {Opt_removed, "oldalloc"},
1544 {Opt_removed, "orlov"},
ac27a0ec
DK		 1545 {Opt_user_xattr, "user_xattr"},
1546 {Opt_nouser_xattr, "nouser_xattr"},
1547 {Opt_acl, "acl"},
1548 {Opt_noacl, "noacl"},
e3bb52ae 1549 {Opt_noload, "norecovery"},
5a916be1 1550 {Opt_noload, "noload"},
72578c33
TT		 1551 {Opt_removed, "nobh"},
1552 {Opt_removed, "bh"},
ac27a0ec 1553 {Opt_commit, "commit=%u"},
30773840
TT		 1554 {Opt_min_batch_time, "min_batch_time=%u"},
1555 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1556 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1557 {Opt_journal_path, "journal_path=%s"},
818d276c 1558 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1559 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1560 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1561 {Opt_abort, "abort"},
1562 {Opt_data_journal, "data=journal"},
1563 {Opt_data_ordered, "data=ordered"},
1564 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1565 {Opt_data_err_abort, "data_err=abort"},
1566 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1567 {Opt_offusrjquota, "usrjquota="},
1568 {Opt_usrjquota, "usrjquota=%s"},
1569 {Opt_offgrpjquota, "grpjquota="},
1570 {Opt_grpjquota, "grpjquota=%s"},
1571 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1572 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1573 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1574 {Opt_grpquota, "grpquota"},
1575 {Opt_noquota, "noquota"},
1576 {Opt_quota, "quota"},
1577 {Opt_usrquota, "usrquota"},
49da9392 1578 {Opt_prjquota, "prjquota"},
ac27a0ec 1579 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1580 {Opt_barrier, "barrier"},
1581 {Opt_nobarrier, "nobarrier"},
25ec56b5 1582 {Opt_i_version, "i_version"},
923ae0ff 1583 {Opt_dax, "dax"},
c9de560d 1584 {Opt_stripe, "stripe=%u"},
64769240 1585 {Opt_delalloc, "delalloc"},
327eaf73
TT		 1586 {Opt_warn_on_error, "warn_on_error"},
1587 {Opt_nowarn_on_error, "nowarn_on_error"},
a26f4992
TT		 1588 {Opt_lazytime, "lazytime"},
1589 {Opt_nolazytime, "nolazytime"},
670e9875 1590 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1591 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1592 {Opt_removed, "mblk_io_submit"},
1593 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1594 {Opt_block_validity, "block_validity"},
1595 {Opt_noblock_validity, "noblock_validity"},
240799cd 1596 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1597 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1598 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1599 {Opt_auto_da_alloc, "auto_da_alloc"},
1600 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc 1601 {Opt_dioread_nolock, "dioread_nolock"},
244adf64 1602 {Opt_dioread_lock, "nodioread_nolock"},
744692dc 1603 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1604 {Opt_discard, "discard"},
1605 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1606 {Opt_init_itable, "init_itable=%u"},
1607 {Opt_init_itable, "init_itable"},
1608 {Opt_noinit_itable, "noinit_itable"},
df981d03 1609 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
ed318a6c 1610 {Opt_test_dummy_encryption, "test_dummy_encryption=%s"},
6ddb2447 1611 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1612 {Opt_nombcache, "nombcache"},
1613 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
c7198b9c
TT		 1614 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1615 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1616 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1617 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1618 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1619 {Opt_err, NULL},
ac27a0ec
DK		 1620};
1621
617ba13b 1622static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1623{
617ba13b 1624 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1625 char *options = (char *) *data;
1626
1627 if (!options || strncmp(options, "sb=", 3) != 0)
1628 return 1; /* Default location */
0b8e58a1 1629
ac27a0ec 1630 options += 3;
0b8e58a1 1631 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1632 sb_block = simple_strtoul(options, &options, 0);
1633 if (*options && *options != ',') {
4776004f 1634 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1635 (char *) *data);
1636 return 1;
1637 }
1638 if (*options == ',')
1639 options++;
1640 *data = (void *) options;
0b8e58a1 1641
ac27a0ec
DK		 1642 return sb_block;
1643}
1644
b3881f74 1645#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1646static const char deprecated_msg[] =
1647 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1648 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1649
56c50f11
DM		 1650#ifdef CONFIG_QUOTA
1651static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1652{
1653 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1654 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
03dafb5f 1655 int ret = -1;
56c50f11 1656
33458eab 1657 if (sb_any_quota_loaded(sb) && !old_qname) {
56c50f11
DM		 1658 ext4_msg(sb, KERN_ERR,
1659 "Cannot change journaled "
1660 "quota options when quota turned on");
57f73c2c 1661 return -1;
56c50f11 1662 }
e2b911c5 1663 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1664 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1665 "ignored when QUOTA feature is enabled");
1666 return 1;
262b4662 1667 }
56c50f11
DM		 1668 qname = match_strdup(args);
1669 if (!qname) {
1670 ext4_msg(sb, KERN_ERR,
1671 "Not enough memory for storing quotafile name");
57f73c2c 1672 return -1;
56c50f11 1673 }
33458eab
TT		 1674 if (old_qname) {
1675 if (strcmp(old_qname, qname) == 0)
03dafb5f
CG		 1676 ret = 1;
1677 else
1678 ext4_msg(sb, KERN_ERR,
1679 "%s quota file already specified",
1680 QTYPE2NAME(qtype));
1681 goto errout;
56c50f11 1682 }
03dafb5f 1683 if (strchr(qname, '/')) {
56c50f11
DM		 1684 ext4_msg(sb, KERN_ERR,
1685 "quotafile must be on filesystem root");
03dafb5f 1686 goto errout;
56c50f11 1687 }
33458eab 1688 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
fd8c37ec 1689 set_opt(sb, QUOTA);
56c50f11 1690 return 1;
03dafb5f
CG		 1691errout:
1692 kfree(qname);
1693 return ret;
56c50f11
DM		 1694}
1695
1696static int clear_qf_name(struct super_block *sb, int qtype)
1697{
1698
1699 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1700 char *old_qname = get_qf_name(sb, sbi, qtype);
56c50f11 1701
33458eab 1702 if (sb_any_quota_loaded(sb) && old_qname) {
56c50f11
DM		 1703 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1704 " when quota turned on");
57f73c2c 1705 return -1;
56c50f11 1706 }
33458eab
TT		 1707 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1708 synchronize_rcu();
1709 kfree(old_qname);
56c50f11
DM		 1710 return 1;
1711}
1712#endif
1713
26092bf5
TT		 1714#define MOPT_SET 0x0001
1715#define MOPT_CLEAR 0x0002
1716#define MOPT_NOSUPPORT 0x0004
1717#define MOPT_EXPLICIT 0x0008
1718#define MOPT_CLEAR_ERR 0x0010
1719#define MOPT_GTE0 0x0020
ac27a0ec 1720#ifdef CONFIG_QUOTA
26092bf5
TT		 1721#define MOPT_Q 0
1722#define MOPT_QFMT 0x0040
1723#else
1724#define MOPT_Q MOPT_NOSUPPORT
1725#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1726#endif
26092bf5 1727#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1728#define MOPT_NO_EXT2 0x0100
1729#define MOPT_NO_EXT3 0x0200
1730#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1731#define MOPT_STRING 0x0400
26092bf5
TT		 1732
1733static const struct mount_opts {
1734 int token;
1735 int mount_opt;
1736 int flags;
1737} ext4_mount_opts[] = {
1738 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1739 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1740 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1741 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1742 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1743 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1744 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1745 MOPT_EXT4_ONLY | MOPT_SET},
1746 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1747 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1748 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1749 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1750 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1751 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1752 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1753 MOPT_EXT4_ONLY | MOPT_CLEAR},
327eaf73
TT		 1754 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1755 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
c6d3d56d
DW		 1756 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1757 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1758 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1759 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1760 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1761 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1762 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1763 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1764 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1765 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1766 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1767 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1768 MOPT_NO_EXT2},
8dc0aa8c 1769 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1770 MOPT_NO_EXT2},
26092bf5
TT		 1771 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1772 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1773 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1774 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1775 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1776 {Opt_commit, 0, MOPT_GTE0},
1777 {Opt_max_batch_time, 0, MOPT_GTE0},
1778 {Opt_min_batch_time, 0, MOPT_GTE0},
1779 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1780 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1781 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1782 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1783 {Opt_resuid, 0, MOPT_GTE0},
1784 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1785 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1786 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1787 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1788 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1789 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1790 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1791 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1792 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1793 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1794#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1795 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1796 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1797#else
26092bf5
TT		 1798 {Opt_acl, 0, MOPT_NOSUPPORT},
1799 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1800#endif
26092bf5
TT		 1801 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1802 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1803 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1804 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1805 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1806 MOPT_SET | MOPT_Q},
1807 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1808 MOPT_SET | MOPT_Q},
49da9392
JK		 1809 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1810 MOPT_SET | MOPT_Q},
26092bf5 1811 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1812 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1813 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1814 {Opt_usrjquota, 0, MOPT_Q},
1815 {Opt_grpjquota, 0, MOPT_Q},
1816 {Opt_offusrjquota, 0, MOPT_Q},
1817 {Opt_offgrpjquota, 0, MOPT_Q},
1818 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1819 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1820 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1821 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
ed318a6c 1822 {Opt_test_dummy_encryption, 0, MOPT_STRING},
cdb7ee4c 1823 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
26092bf5
TT		 1824 {Opt_err, 0, 0}
1825};
1826
c83ad55e
GKB		 1827#ifdef CONFIG_UNICODE
1828static const struct ext4_sb_encodings {
1829 __u16 magic;
1830 char *name;
1831 char *version;
1832} ext4_sb_encoding_map[] = {
1833 {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1834};
1835
1836static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1837 const struct ext4_sb_encodings **encoding,
1838 __u16 *flags)
1839{
1840 __u16 magic = le16_to_cpu(es->s_encoding);
1841 int i;
1842
1843 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1844 if (magic == ext4_sb_encoding_map[i].magic)
1845 break;
1846
1847 if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1848 return -EINVAL;
1849
1850 *encoding = &ext4_sb_encoding_map[i];
1851 *flags = le16_to_cpu(es->s_encoding_flags);
1852
1853 return 0;
1854}
1855#endif
1856
ed318a6c
EB		 1857static int ext4_set_test_dummy_encryption(struct super_block *sb,
1858 const char *opt,
1859 const substring_t *arg,
1860 bool is_remount)
1861{
1862#ifdef CONFIG_FS_ENCRYPTION
1863 struct ext4_sb_info *sbi = EXT4_SB(sb);
1864 int err;
1865
1866 /*
1867 * This mount option is just for testing, and it's not worthwhile to
1868 * implement the extra complexity (e.g. RCU protection) that would be
1869 * needed to allow it to be set or changed during remount. We do allow
1870 * it to be specified during remount, but only if there is no change.
1871 */
1872 if (is_remount && !sbi->s_dummy_enc_ctx.ctx) {
1873 ext4_msg(sb, KERN_WARNING,
1874 "Can't set test_dummy_encryption on remount");
1875 return -1;
1876 }
1877 err = fscrypt_set_test_dummy_encryption(sb, arg, &sbi->s_dummy_enc_ctx);
1878 if (err) {
1879 if (err == -EEXIST)
1880 ext4_msg(sb, KERN_WARNING,
1881 "Can't change test_dummy_encryption on remount");
1882 else if (err == -EINVAL)
1883 ext4_msg(sb, KERN_WARNING,
1884 "Value of option \"%s\" is unrecognized", opt);
1885 else
1886 ext4_msg(sb, KERN_WARNING,
1887 "Error processing option \"%s\" [%d]",
1888 opt, err);
1889 return -1;
1890 }
1891 ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
1892#else
1893 ext4_msg(sb, KERN_WARNING,
1894 "Test dummy encryption mount option ignored");
1895#endif
1896 return 1;
1897}
1898
26092bf5
TT		 1899static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1900 substring_t *args, unsigned long *journal_devnum,
1901 unsigned int *journal_ioprio, int is_remount)
1902{
1903 struct ext4_sb_info *sbi = EXT4_SB(sb);
1904 const struct mount_opts *m;
08cefc7a
EB		 1905 kuid_t uid;
1906 kgid_t gid;
26092bf5
TT		 1907 int arg = 0;
1908
57f73c2c
TT		 1909#ifdef CONFIG_QUOTA
1910 if (token == Opt_usrjquota)
1911 return set_qf_name(sb, USRQUOTA, &args[0]);
1912 else if (token == Opt_grpjquota)
1913 return set_qf_name(sb, GRPQUOTA, &args[0]);
1914 else if (token == Opt_offusrjquota)
1915 return clear_qf_name(sb, USRQUOTA);
1916 else if (token == Opt_offgrpjquota)
1917 return clear_qf_name(sb, GRPQUOTA);
1918#endif
26092bf5 1919 switch (token) {
f7048605
TT		 1920 case Opt_noacl:
1921 case Opt_nouser_xattr:
1922 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1923 break;
26092bf5
TT		 1924 case Opt_sb:
1925 return 1; /* handled by get_sb_block() */
1926 case Opt_removed:
5f3633e3 1927 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1928 return 1;
26092bf5
TT		 1929 case Opt_abort:
1930 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1931 return 1;
1932 case Opt_i_version:
357fdad0 1933 sb->s_flags |= SB_I_VERSION;
26092bf5 1934 return 1;
a26f4992 1935 case Opt_lazytime:
1751e8a6 1936 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1937 return 1;
1938 case Opt_nolazytime:
1751e8a6 1939 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1940 return 1;
26092bf5
TT		 1941 }
1942
5f3633e3
JK		 1943 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1944 if (token == m->token)
1945 break;
1946
1947 if (m->token == Opt_err) {
1948 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1949 "or missing value", opt);
1950 return -1;
1951 }
1952
8dc0aa8c
TT		 1953 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1954 ext4_msg(sb, KERN_ERR,
1955 "Mount option \"%s\" incompatible with ext2", opt);
1956 return -1;
1957 }
1958 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1959 ext4_msg(sb, KERN_ERR,
1960 "Mount option \"%s\" incompatible with ext3", opt);
1961 return -1;
1962 }
1963
ad4eec61 1964 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1965 return -1;
1966 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1967 return -1;
c93cf2d7
DM		 1968 if (m->flags & MOPT_EXPLICIT) {
1969 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1970 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1971 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1972 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1973 } else
1974 return -1;
1975 }
5f3633e3
JK		 1976 if (m->flags & MOPT_CLEAR_ERR)
1977 clear_opt(sb, ERRORS_MASK);
1978 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1979 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1980 "options when quota turned on");
1981 return -1;
1982 }
1983
1984 if (m->flags & MOPT_NOSUPPORT) {
1985 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1986 } else if (token == Opt_commit) {
1987 if (arg == 0)
1988 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
9ba55543 1989 else if (arg > INT_MAX / HZ) {
1990 ext4_msg(sb, KERN_ERR,
1991 "Invalid commit interval %d, "
1992 "must be smaller than %d",
1993 arg, INT_MAX / HZ);
1994 return -1;
1995 }
5f3633e3 1996 sbi->s_commit_interval = HZ * arg;
670e9875 1997 } else if (token == Opt_debug_want_extra_isize) {
9803387c
TT		 1998 if ((arg & 1) ||
1999 (arg < 4) ||
2000 (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
2001 ext4_msg(sb, KERN_ERR,
2002 "Invalid want_extra_isize %d", arg);
2003 return -1;
2004 }
670e9875 2005 sbi->s_want_extra_isize = arg;
5f3633e3 2006 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 2007 sbi->s_max_batch_time = arg;
2008 } else if (token == Opt_min_batch_time) {
2009 sbi->s_min_batch_time = arg;
2010 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 2011 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
2012 ext4_msg(sb, KERN_ERR,
2013 "EXT4-fs: inode_readahead_blks must be "
2014 "0 or a power of 2 smaller than 2^31");
26092bf5 2015 return -1;
5f3633e3
JK		 2016 }
2017 sbi->s_inode_readahead_blks = arg;
2018 } else if (token == Opt_init_itable) {
2019 set_opt(sb, INIT_INODE_TABLE);
2020 if (!args->from)
2021 arg = EXT4_DEF_LI_WAIT_MULT;
2022 sbi->s_li_wait_mult = arg;
2023 } else if (token == Opt_max_dir_size_kb) {
2024 sbi->s_max_dir_size_kb = arg;
2025 } else if (token == Opt_stripe) {
2026 sbi->s_stripe = arg;
2027 } else if (token == Opt_resuid) {
2028 uid = make_kuid(current_user_ns(), arg);
2029 if (!uid_valid(uid)) {
2030 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 2031 return -1;
2032 }
5f3633e3
JK		 2033 sbi->s_resuid = uid;
2034 } else if (token == Opt_resgid) {
2035 gid = make_kgid(current_user_ns(), arg);
2036 if (!gid_valid(gid)) {
2037 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
2038 return -1;
2039 }
2040 sbi->s_resgid = gid;
2041 } else if (token == Opt_journal_dev) {
2042 if (is_remount) {
2043 ext4_msg(sb, KERN_ERR,
2044 "Cannot specify journal on remount");
2045 return -1;
2046 }
2047 *journal_devnum = arg;
ad4eec61
ES		 2048 } else if (token == Opt_journal_path) {
2049 char *journal_path;
2050 struct inode *journal_inode;
2051 struct path path;
2052 int error;
2053
2054 if (is_remount) {
2055 ext4_msg(sb, KERN_ERR,
2056 "Cannot specify journal on remount");
2057 return -1;
2058 }
2059 journal_path = match_strdup(&args[0]);
2060 if (!journal_path) {
2061 ext4_msg(sb, KERN_ERR, "error: could not dup "
2062 "journal device string");
2063 return -1;
2064 }
2065
2066 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
2067 if (error) {
2068 ext4_msg(sb, KERN_ERR, "error: could not find "
2069 "journal device path: error %d", error);
2070 kfree(journal_path);
2071 return -1;
2072 }
2073
2b0143b5 2074 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 2075 if (!S_ISBLK(journal_inode->i_mode)) {
2076 ext4_msg(sb, KERN_ERR, "error: journal path %s "
2077 "is not a block device", journal_path);
2078 path_put(&path);
2079 kfree(journal_path);
2080 return -1;
2081 }
2082
2083 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
2084 path_put(&path);
2085 kfree(journal_path);
5f3633e3
JK		 2086 } else if (token == Opt_journal_ioprio) {
2087 if (arg > 7) {
2088 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
2089 " (must be 0-7)");
2090 return -1;
2091 }
2092 *journal_ioprio =
2093 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447 2094 } else if (token == Opt_test_dummy_encryption) {
ed318a6c
EB		 2095 return ext4_set_test_dummy_encryption(sb, opt, &args[0],
2096 is_remount);
5f3633e3
JK		 2097 } else if (m->flags & MOPT_DATAJ) {
2098 if (is_remount) {
2099 if (!sbi->s_journal)
2100 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2101 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 2102 ext4_msg(sb, KERN_ERR,
26092bf5 2103 "Cannot change data mode on remount");
26092bf5 2104 return -1;
ac27a0ec 2105 }
26092bf5 2106 } else {
5f3633e3
JK		 2107 clear_opt(sb, DATA_FLAGS);
2108 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 2109 }
5f3633e3
JK		 2110#ifdef CONFIG_QUOTA
2111 } else if (m->flags & MOPT_QFMT) {
2112 if (sb_any_quota_loaded(sb) &&
2113 sbi->s_jquota_fmt != m->mount_opt) {
2114 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2115 "quota options when quota turned on");
2116 return -1;
2117 }
e2b911c5 2118 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 2119 ext4_msg(sb, KERN_INFO,
2120 "Quota format mount options ignored "
262b4662 2121 "when QUOTA feature is enabled");
c325a67c 2122 return 1;
262b4662 2123 }
5f3633e3 2124 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 2125#endif
923ae0ff 2126 } else if (token == Opt_dax) {
ef83b6e8
DW		 2127#ifdef CONFIG_FS_DAX
2128 ext4_msg(sb, KERN_WARNING,
2129 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
a92abd73 2130 sbi->s_mount_opt |= m->mount_opt;
ef83b6e8 2131#else
923ae0ff
RZ		 2132 ext4_msg(sb, KERN_INFO, "dax option not supported");
2133 return -1;
5f3633e3 2134#endif
7915a861
AN		 2135 } else if (token == Opt_data_err_abort) {
2136 sbi->s_mount_opt |= m->mount_opt;
2137 } else if (token == Opt_data_err_ignore) {
2138 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 2139 } else {
2140 if (!args->from)
2141 arg = 1;
2142 if (m->flags & MOPT_CLEAR)
2143 arg = !arg;
2144 else if (unlikely(!(m->flags & MOPT_SET))) {
2145 ext4_msg(sb, KERN_WARNING,
2146 "buggy handling of option %s", opt);
2147 WARN_ON(1);
2148 return -1;
2149 }
2150 if (arg != 0)
2151 sbi->s_mount_opt |= m->mount_opt;
2152 else
2153 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 2154 }
5f3633e3 2155 return 1;
26092bf5
TT		 2156}
2157
2158static int parse_options(char *options, struct super_block *sb,
2159 unsigned long *journal_devnum,
2160 unsigned int *journal_ioprio,
2161 int is_remount)
2162{
1e1a76ed 2163 struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb);
33458eab 2164 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
26092bf5
TT		 2165 substring_t args[MAX_OPT_ARGS];
2166 int token;
2167
2168 if (!options)
2169 return 1;
2170
2171 while ((p = strsep(&options, ",")) != NULL) {
2172 if (!*p)
2173 continue;
2174 /*
2175 * Initialize args struct so we know whether arg was
2176 * found; some options take optional arguments.
2177 */
caecd0af 2178 args[0].to = args[0].from = NULL;
26092bf5
TT		 2179 token = match_token(p, tokens, args);
2180 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2181 journal_ioprio, is_remount) < 0)
2182 return 0;
ac27a0ec
DK		 2183 }
2184#ifdef CONFIG_QUOTA
49da9392
JK		 2185 /*
2186 * We do the test below only for project quotas. 'usrquota' and
2187 * 'grpquota' mount options are allowed even without quota feature
2188 * to support legacy quotas in quota files.
2189 */
2190 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2191 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2192 "Cannot enable project quota enforcement.");
2193 return 0;
2194 }
33458eab
TT		 2195 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2196 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2197 if (usr_qf_name || grp_qf_name) {
2198 if (test_opt(sb, USRQUOTA) && usr_qf_name)
fd8c37ec 2199 clear_opt(sb, USRQUOTA);
ac27a0ec 2200
33458eab 2201 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
fd8c37ec 2202 clear_opt(sb, GRPQUOTA);
ac27a0ec 2203
56c50f11 2204 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 2205 ext4_msg(sb, KERN_ERR, "old and new quota "
2206 "format mixing");
ac27a0ec
DK		 2207 return 0;
2208 }
2209
2210 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 2211 ext4_msg(sb, KERN_ERR, "journaled quota format "
2212 "not specified");
ac27a0ec
DK		 2213 return 0;
2214 }
ac27a0ec
DK		 2215 }
2216#endif
626b035b
RH		 2217 if (test_opt(sb, DIOREAD_NOLOCK)) {
2218 int blocksize =
2219 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2220 if (blocksize < PAGE_SIZE)
2221 ext4_msg(sb, KERN_WARNING, "Warning: mounting with an "
2222 "experimental mount option 'dioread_nolock' "
2223 "for blocksize < PAGE_SIZE");
2224 }
ac27a0ec
DK		 2225 return 1;
2226}
2227
2adf6da8
TT		 2228static inline void ext4_show_quota_options(struct seq_file *seq,
2229 struct super_block *sb)
2230{
2231#if defined(CONFIG_QUOTA)
2232 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2233 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2234
2235 if (sbi->s_jquota_fmt) {
2236 char *fmtname = "";
2237
2238 switch (sbi->s_jquota_fmt) {
2239 case QFMT_VFS_OLD:
2240 fmtname = "vfsold";
2241 break;
2242 case QFMT_VFS_V0:
2243 fmtname = "vfsv0";
2244 break;
2245 case QFMT_VFS_V1:
2246 fmtname = "vfsv1";
2247 break;
2248 }
2249 seq_printf(seq, ",jqfmt=%s", fmtname);
2250 }
2251
33458eab
TT		 2252 rcu_read_lock();
2253 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2254 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2255 if (usr_qf_name)
2256 seq_show_option(seq, "usrjquota", usr_qf_name);
2257 if (grp_qf_name)
2258 seq_show_option(seq, "grpjquota", grp_qf_name);
2259 rcu_read_unlock();
2adf6da8
TT		 2260#endif
2261}
2262
5a916be1
TT		 2263static const char *token2str(int token)
2264{
50df9fd5 2265 const struct match_token *t;
5a916be1
TT		 2266
2267 for (t = tokens; t->token != Opt_err; t++)
2268 if (t->token == token && !strchr(t->pattern, '='))
2269 break;
2270 return t->pattern;
2271}
2272
2adf6da8
TT		 2273/*
2274 * Show an option if
2275 * - it's set to a non-default value OR
2276 * - if the per-sb default is different from the global default
2277 */
66acdcf4
TT		 2278static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2279 int nodefs)
2adf6da8 2280{
2adf6da8
TT		 2281 struct ext4_sb_info *sbi = EXT4_SB(sb);
2282 struct ext4_super_block *es = sbi->s_es;
68afa7e0 2283 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
5a916be1 2284 const struct mount_opts *m;
66acdcf4 2285 char sep = nodefs ? '\n' : ',';
2adf6da8 2286
66acdcf4
TT		 2287#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2288#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2289
2290 if (sbi->s_sb_block != 1)
5a916be1
TT		 2291 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2292
2293 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2294 int want_set = m->flags & MOPT_SET;
2295 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2296 (m->flags & MOPT_CLEAR_ERR))
2297 continue;
68afa7e0 2298 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2299 continue; /* skip if same as the default */
2300 if ((want_set &&
2301 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2302 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2303 continue; /* select Opt_noFoo vs Opt_Foo */
2304 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2305 }
5a916be1 2306
08cefc7a 2307 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2308 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2309 SEQ_OPTS_PRINT("resuid=%u",
2310 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2311 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2312 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2313 SEQ_OPTS_PRINT("resgid=%u",
2314 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2315 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2316 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2317 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2318 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2319 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2320 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2321 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2322 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2323 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2324 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2325 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2326 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2327 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2328 if (sb->s_flags & SB_I_VERSION)
5a916be1 2329 SEQ_OPTS_PUTS("i_version");
66acdcf4 2330 if (nodefs || sbi->s_stripe)
5a916be1 2331 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0
TN		 2332 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2333 (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2334 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2335 SEQ_OPTS_PUTS("data=journal");
2336 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2337 SEQ_OPTS_PUTS("data=ordered");
2338 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2339 SEQ_OPTS_PUTS("data=writeback");
2340 }
66acdcf4
TT		 2341 if (nodefs ||
2342 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2343 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2344 sbi->s_inode_readahead_blks);
2adf6da8 2345
ceec0376 2346 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 2347 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2348 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2349 if (nodefs || sbi->s_max_dir_size_kb)
2350 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2351 if (test_opt(sb, DATA_ERR_ABORT))
2352 SEQ_OPTS_PUTS("data_err=abort");
ed318a6c
EB		 2353
2354 fscrypt_show_test_dummy_encryption(seq, sep, sb);
2adf6da8
TT		 2355
2356 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2357 return 0;
2358}
2359
66acdcf4
TT		 2360static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2361{
2362 return _ext4_show_options(seq, root->d_sb, 0);
2363}
2364
ebd173be 2365int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2366{
2367 struct super_block *sb = seq->private;
2368 int rc;
2369
bc98a42c 2370 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2371 rc = _ext4_show_options(seq, sb, 1);
2372 seq_puts(seq, "\n");
2373 return rc;
2374}
2375
617ba13b 2376static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2377 int read_only)
2378{
617ba13b 2379 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 2380 int err = 0;
ac27a0ec 2381
617ba13b 2382 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2383 ext4_msg(sb, KERN_ERR, "revision level too high, "
2384 "forcing read-only mode");
c89128a0 2385 err = -EROFS;
ac27a0ec
DK		 2386 }
2387 if (read_only)
281b5995 2388 goto done;
617ba13b 2389 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2390 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2391 "running e2fsck is recommended");
c8b459f4 2392 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2393 ext4_msg(sb, KERN_WARNING,
2394 "warning: mounting fs with errors, "
2395 "running e2fsck is recommended");
ed3ce80a 2396 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2397 le16_to_cpu(es->s_mnt_count) >=
2398 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2399 ext4_msg(sb, KERN_WARNING,
2400 "warning: maximal mount count reached, "
2401 "running e2fsck is recommended");
ac27a0ec 2402 else if (le32_to_cpu(es->s_checkinterval) &&
6a0678a7
AB		 2403 (ext4_get_tstamp(es, s_lastcheck) +
2404 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
b31e1552
ES		 2405 ext4_msg(sb, KERN_WARNING,
2406 "warning: checktime reached, "
2407 "running e2fsck is recommended");
0b8e58a1 2408 if (!sbi->s_journal)
0390131b 2409 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2410 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2411 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2412 le16_add_cpu(&es->s_mnt_count, 1);
6a0678a7 2413 ext4_update_tstamp(es, s_mtime);
0390131b 2414 if (sbi->s_journal)
e2b911c5 2415 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2416
c89128a0 2417 err = ext4_commit_super(sb, 1);
281b5995 2418done:
ac27a0ec 2419 if (test_opt(sb, DEBUG))
a9df9a49 2420 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2421 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2422 sb->s_blocksize,
2423 sbi->s_groups_count,
617ba13b
MC		 2424 EXT4_BLOCKS_PER_GROUP(sb),
2425 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2426 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2427
7abc52c2 2428 cleancache_init_fs(sb);
c89128a0 2429 return err;
ac27a0ec
DK		 2430}
2431
117fff10
TT		 2432int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2433{
2434 struct ext4_sb_info *sbi = EXT4_SB(sb);
7c990728 2435 struct flex_groups **old_groups, **new_groups;
37b0b6b8 2436 int size, i, j;
117fff10
TT		 2437
2438 if (!sbi->s_log_groups_per_flex)
2439 return 0;
2440
2441 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2442 if (size <= sbi->s_flex_groups_allocated)
2443 return 0;
2444
7c990728
SJS		 2445 new_groups = kvzalloc(roundup_pow_of_two(size *
2446 sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
117fff10 2447 if (!new_groups) {
7c990728
SJS		 2448 ext4_msg(sb, KERN_ERR,
2449 "not enough memory for %d flex group pointers", size);
117fff10
TT		 2450 return -ENOMEM;
2451 }
7c990728
SJS		 2452 for (i = sbi->s_flex_groups_allocated; i < size; i++) {
2453 new_groups[i] = kvzalloc(roundup_pow_of_two(
2454 sizeof(struct flex_groups)),
2455 GFP_KERNEL);
2456 if (!new_groups[i]) {
37b0b6b8
DC		 2457 for (j = sbi->s_flex_groups_allocated; j < i; j++)
2458 kvfree(new_groups[j]);
7c990728
SJS		 2459 kvfree(new_groups);
2460 ext4_msg(sb, KERN_ERR,
2461 "not enough memory for %d flex groups", size);
2462 return -ENOMEM;
2463 }
117fff10 2464 }
7c990728
SJS		 2465 rcu_read_lock();
2466 old_groups = rcu_dereference(sbi->s_flex_groups);
2467 if (old_groups)
2468 memcpy(new_groups, old_groups,
2469 (sbi->s_flex_groups_allocated *
2470 sizeof(struct flex_groups *)));
2471 rcu_read_unlock();
2472 rcu_assign_pointer(sbi->s_flex_groups, new_groups);
2473 sbi->s_flex_groups_allocated = size;
2474 if (old_groups)
2475 ext4_kvfree_array_rcu(old_groups);
117fff10
TT		 2476 return 0;
2477}
2478
772cb7c8
JS		 2479static int ext4_fill_flex_info(struct super_block *sb)
2480{
2481 struct ext4_sb_info *sbi = EXT4_SB(sb);
2482 struct ext4_group_desc *gdp = NULL;
7c990728 2483 struct flex_groups *fg;
772cb7c8 2484 ext4_group_t flex_group;
117fff10 2485 int i, err;
772cb7c8 2486
503358ae 2487 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2488 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2489 sbi->s_log_groups_per_flex = 0;
2490 return 1;
2491 }
2492
117fff10
TT		 2493 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2494 if (err)
9933fc0a 2495 goto failed;
772cb7c8 2496
772cb7c8 2497 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2498 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2499
2500 flex_group = ext4_flex_group(sbi, i);
7c990728
SJS		 2501 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
2502 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
90ba983f 2503 atomic64_add(ext4_free_group_clusters(sb, gdp),
7c990728
SJS		 2504 &fg->free_clusters);
2505 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
772cb7c8
JS		 2506 }
2507
2508 return 1;
2509failed:
2510 return 0;
2511}
2512
e2b911c5 2513static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2514 struct ext4_group_desc *gdp)
717d50e4 2515{
b47820ed 2516 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2517 __u16 crc = 0;
feb0ab32 2518 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2519 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2520
9aa5d32b 2521 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2522 /* Use new metadata_csum algorithm */
feb0ab32 2523 __u32 csum32;
b47820ed 2524 __u16 dummy_csum = 0;
feb0ab32 2525
feb0ab32
DW		 2526 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2527 sizeof(le_group));
b47820ed
DJ		 2528 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2529 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2530 sizeof(dummy_csum));
2531 offset += sizeof(dummy_csum);
2532 if (offset < sbi->s_desc_size)
2533 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2534 sbi->s_desc_size - offset);
feb0ab32
DW		 2535
2536 crc = csum32 & 0xFFFF;
2537 goto out;
717d50e4
AD		 2538 }
2539
feb0ab32 2540 /* old crc16 code */
e2b911c5 2541 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2542 return 0;
2543
feb0ab32
DW		 2544 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2545 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2546 crc = crc16(crc, (__u8 *)gdp, offset);
2547 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2548 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2549 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2550 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2551 crc = crc16(crc, (__u8 *)gdp + offset,
2552 le16_to_cpu(sbi->s_es->s_desc_size) -
2553 offset);
2554
2555out:
717d50e4
AD		 2556 return cpu_to_le16(crc);
2557}
2558
feb0ab32 2559int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2560 struct ext4_group_desc *gdp)
2561{
feb0ab32 2562 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2563 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2564 return 0;
2565
2566 return 1;
2567}
2568
feb0ab32
DW		 2569void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2570 struct ext4_group_desc *gdp)
2571{
2572 if (!ext4_has_group_desc_csum(sb))
2573 return;
e2b911c5 2574 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2575}
2576
ac27a0ec 2577/* Called at mount-time, super-block is locked */
bfff6873 2578static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2579 ext4_fsblk_t sb_block,
bfff6873 2580 ext4_group_t *first_not_zeroed)
ac27a0ec 2581{
617ba13b
MC		 2582 struct ext4_sb_info *sbi = EXT4_SB(sb);
2583 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2584 ext4_fsblk_t last_block;
44de022c 2585 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 2586 ext4_fsblk_t block_bitmap;
2587 ext4_fsblk_t inode_bitmap;
2588 ext4_fsblk_t inode_table;
ce421581 2589 int flexbg_flag = 0;
bfff6873 2590 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2591
e2b911c5 2592 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2593 flexbg_flag = 1;
2594
af5bc92d 2595 ext4_debug("Checking group descriptors");
ac27a0ec 2596
197cd65a
AM		 2597 for (i = 0; i < sbi->s_groups_count; i++) {
2598 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2599
ce421581 2600 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2601 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2602 else
2603 last_block = first_block +
617ba13b 2604 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2605
bfff6873
LC		 2606 if ((grp == sbi->s_groups_count) &&
2607 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2608 grp = i;
2609
8fadc143 2610 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2611 if (block_bitmap == sb_block) {
2612 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2613 "Block bitmap for group %u overlaps "
2614 "superblock", i);
18db4b4e
TT		 2615 if (!sb_rdonly(sb))
2616 return 0;
829fa70d 2617 }
77260807
TT		 2618 if (block_bitmap >= sb_block + 1 &&
2619 block_bitmap <= last_bg_block) {
2620 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2621 "Block bitmap for group %u overlaps "
2622 "block group descriptors", i);
2623 if (!sb_rdonly(sb))
2624 return 0;
2625 }
2b2d6d01 2626 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2627 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2628 "Block bitmap for group %u not in group "
b31e1552 2629 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2630 return 0;
2631 }
8fadc143 2632 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2633 if (inode_bitmap == sb_block) {
2634 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2635 "Inode bitmap for group %u overlaps "
2636 "superblock", i);
18db4b4e
TT		 2637 if (!sb_rdonly(sb))
2638 return 0;
829fa70d 2639 }
77260807
TT		 2640 if (inode_bitmap >= sb_block + 1 &&
2641 inode_bitmap <= last_bg_block) {
2642 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2643 "Inode bitmap for group %u overlaps "
2644 "block group descriptors", i);
2645 if (!sb_rdonly(sb))
2646 return 0;
2647 }
2b2d6d01 2648 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2649 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2650 "Inode bitmap for group %u not in group "
b31e1552 2651 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2652 return 0;
2653 }
8fadc143 2654 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2655 if (inode_table == sb_block) {
2656 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2657 "Inode table for group %u overlaps "
2658 "superblock", i);
18db4b4e
TT		 2659 if (!sb_rdonly(sb))
2660 return 0;
829fa70d 2661 }
77260807
TT		 2662 if (inode_table >= sb_block + 1 &&
2663 inode_table <= last_bg_block) {
2664 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2665 "Inode table for group %u overlaps "
2666 "block group descriptors", i);
2667 if (!sb_rdonly(sb))
2668 return 0;
2669 }
bd81d8ee 2670 if (inode_table < first_block ||
2b2d6d01 2671 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2672 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2673 "Inode table for group %u not in group "
b31e1552 2674 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2675 return 0;
2676 }
955ce5f5 2677 ext4_lock_group(sb, i);
feb0ab32 2678 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2679 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2680 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2681 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2682 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2683 if (!sb_rdonly(sb)) {
955ce5f5 2684 ext4_unlock_group(sb, i);
8a266467 2685 return 0;
7ee1ec4c 2686 }
717d50e4 2687 }
955ce5f5 2688 ext4_unlock_group(sb, i);
ce421581
JS		 2689 if (!flexbg_flag)
2690 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2691 }
bfff6873
LC		 2692 if (NULL != first_not_zeroed)
2693 *first_not_zeroed = grp;
ac27a0ec
DK		 2694 return 1;
2695}
2696
617ba13b 2697/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2698 * the superblock) which were deleted from all directories, but held open by
2699 * a process at the time of a crash. We walk the list and try to delete these
2700 * inodes at recovery time (only with a read-write filesystem).
2701 *
2702 * In order to keep the orphan inode chain consistent during traversal (in
2703 * case of crash during recovery), we link each inode into the superblock
2704 * orphan list_head and handle it the same way as an inode deletion during
2705 * normal operation (which journals the operations for us).
2706 *
2707 * We only do an iget() and an iput() on each inode, which is very safe if we
2708 * accidentally point at an in-use or already deleted inode. The worst that
2709 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2710 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2711 * e2fsck was run on this filesystem, and it must have already done the orphan
2712 * inode cleanup for us, so we can safely abort without any further action.
2713 */
2b2d6d01
TT		 2714static void ext4_orphan_cleanup(struct super_block *sb,
2715 struct ext4_super_block *es)
ac27a0ec
DK		 2716{
2717 unsigned int s_flags = sb->s_flags;
2c98eb5e 2718 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2719#ifdef CONFIG_QUOTA
95f1fda4 2720 int quota_update = 0;
ac27a0ec
DK		 2721 int i;
2722#endif
2723 if (!es->s_last_orphan) {
2724 jbd_debug(4, "no orphan inodes to clean up\n");
2725 return;
2726 }
2727
a8f48a95 2728 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2729 ext4_msg(sb, KERN_ERR, "write access "
2730 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2731 return;
2732 }
2733
d39195c3
AG		 2734 /* Check if feature set would not allow a r/w mount */
2735 if (!ext4_feature_set_ok(sb, 0)) {
2736 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2737 "unknown ROCOMPAT features");
2738 return;
2739 }
2740
617ba13b 2741 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2742 /* don't clear list on RO mount w/ errors */
1751e8a6 2743 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2744 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2745 "clearing orphan list.\n");
c25f9bc6
ES		 2746 es->s_last_orphan = 0;
2747 }
ac27a0ec
DK		 2748 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2749 return;
2750 }
2751
1751e8a6 2752 if (s_flags & SB_RDONLY) {
b31e1552 2753 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2754 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2755 }
2756#ifdef CONFIG_QUOTA
2757 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2758 sb->s_flags |= SB_ACTIVE;
95f1fda4 2759
2760 /*
2761 * Turn on quotas which were not enabled for read-only mounts if
2762 * filesystem has quota feature, so that they are updated correctly.
2763 */
1751e8a6 2764 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2765 int ret = ext4_enable_quotas(sb);
2766
2767 if (!ret)
2768 quota_update = 1;
2769 else
2770 ext4_msg(sb, KERN_ERR,
2771 "Cannot turn on quotas: error %d", ret);
2772 }
2773
2774 /* Turn on journaled quotas used for old sytle */
a2d4a646 2775 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2776 if (EXT4_SB(sb)->s_qf_names[i]) {
2777 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2778
2779 if (!ret)
2780 quota_update = 1;
2781 else
b31e1552
ES		 2782 ext4_msg(sb, KERN_ERR,
2783 "Cannot turn on journaled "
95f1fda4 2784 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2785 }
2786 }
2787#endif
2788
2789 while (es->s_last_orphan) {
2790 struct inode *inode;
2791
c65d5c6c
VN		 2792 /*
2793 * We may have encountered an error during cleanup; if
2794 * so, skip the rest.
2795 */
2796 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2797 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2798 es->s_last_orphan = 0;
2799 break;
2800 }
2801
97bd42b9
JB		 2802 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2803 if (IS_ERR(inode)) {
ac27a0ec
DK		 2804 es->s_last_orphan = 0;
2805 break;
2806 }
2807
617ba13b 2808 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2809 dquot_initialize(inode);
ac27a0ec 2810 if (inode->i_nlink) {
566370a2
PT		 2811 if (test_opt(sb, DEBUG))
2812 ext4_msg(sb, KERN_DEBUG,
2813 "%s: truncating inode %lu to %lld bytes",
2814 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2815 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2816 inode->i_ino, inode->i_size);
5955102c 2817 inode_lock(inode);
55f252c9 2818 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2819 ret = ext4_truncate(inode);
2820 if (ret)
2821 ext4_std_error(inode->i_sb, ret);
5955102c 2822 inode_unlock(inode);
ac27a0ec
DK		 2823 nr_truncates++;
2824 } else {
566370a2
PT		 2825 if (test_opt(sb, DEBUG))
2826 ext4_msg(sb, KERN_DEBUG,
2827 "%s: deleting unreferenced inode %lu",
2828 __func__, inode->i_ino);
ac27a0ec
DK		 2829 jbd_debug(2, "deleting unreferenced inode %lu\n",
2830 inode->i_ino);
2831 nr_orphans++;
2832 }
2833 iput(inode); /* The delete magic happens here! */
2834 }
2835
2b2d6d01 2836#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2837
2838 if (nr_orphans)
b31e1552
ES		 2839 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2840 PLURAL(nr_orphans));
ac27a0ec 2841 if (nr_truncates)
b31e1552
ES		 2842 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2843 PLURAL(nr_truncates));
ac27a0ec 2844#ifdef CONFIG_QUOTA
95f1fda4 2845 /* Turn off quotas if they were enabled for orphan cleanup */
2846 if (quota_update) {
2847 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2848 if (sb_dqopt(sb)->files[i])
2849 dquot_quota_off(sb, i);
2850 }
ac27a0ec
DK		 2851 }
2852#endif
1751e8a6 2853 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2854}
0b8e58a1 2855
cd2291a4
ES		 2856/*
2857 * Maximal extent format file size.
2858 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2859 * extent format containers, within a sector_t, and within i_blocks
2860 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2861 * so that won't be a limiting factor.
2862 *
f17722f9
LC		 2863 * However there is other limiting factor. We do store extents in the form
2864 * of starting block and length, hence the resulting length of the extent
2865 * covering maximum file size must fit into on-disk format containers as
2866 * well. Given that length is always by 1 unit bigger than max unit (because
2867 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2868 *
cd2291a4
ES		 2869 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2870 */
f287a1a5 2871static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2872{
2873 loff_t res;
2874 loff_t upper_limit = MAX_LFS_FILESIZE;
2875
72deb455
CH		 2876 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2877
2878 if (!has_huge_files) {
cd2291a4
ES		 2879 upper_limit = (1LL << 32) - 1;
2880
2881 /* total blocks in file system block size */
2882 upper_limit >>= (blkbits - 9);
2883 upper_limit <<= blkbits;
2884 }
2885
f17722f9
LC		 2886 /*
2887 * 32-bit extent-start container, ee_block. We lower the maxbytes
2888 * by one fs block, so ee_len can cover the extent of maximum file
2889 * size
2890 */
2891 res = (1LL << 32) - 1;
cd2291a4 2892 res <<= blkbits;
cd2291a4
ES		 2893
2894 /* Sanity check against vm- & vfs- imposed limits */
2895 if (res > upper_limit)
2896 res = upper_limit;
2897
2898 return res;
2899}
ac27a0ec 2900
ac27a0ec 2901/*
cd2291a4 2902 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2903 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2904 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2905 */
f287a1a5 2906static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2907{
617ba13b 2908 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2909 int meta_blocks;
2910 loff_t upper_limit;
0b8e58a1
AD		 2911 /* This is calculated to be the largest file size for a dense, block
2912 * mapped file such that the file's total number of 512-byte sectors,
2913 * including data and all indirect blocks, does not exceed (2^48 - 1).
2914 *
2915 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2916 * number of 512-byte sectors of the file.
0fc1b451
AK		 2917 */
2918
72deb455 2919 if (!has_huge_files) {
0fc1b451 2920 /*
72deb455
CH		 2921 * !has_huge_files or implies that the inode i_block field
2922 * represents total file blocks in 2^32 512-byte sectors ==
2923 * size of vfs inode i_blocks * 8
0fc1b451
AK		 2924 */
2925 upper_limit = (1LL << 32) - 1;
2926
2927 /* total blocks in file system block size */
2928 upper_limit >>= (bits - 9);
2929
2930 } else {
8180a562
AK		 2931 /*
2932 * We use 48 bit ext4_inode i_blocks
2933 * With EXT4_HUGE_FILE_FL set the i_blocks
2934 * represent total number of blocks in
2935 * file system block size
2936 */
0fc1b451
AK		 2937 upper_limit = (1LL << 48) - 1;
2938
0fc1b451
AK		 2939 }
2940
2941 /* indirect blocks */
2942 meta_blocks = 1;
2943 /* double indirect blocks */
2944 meta_blocks += 1 + (1LL << (bits-2));
2945 /* tripple indirect blocks */
2946 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2947
2948 upper_limit -= meta_blocks;
2949 upper_limit <<= bits;
ac27a0ec
DK		 2950
2951 res += 1LL << (bits-2);
2952 res += 1LL << (2*(bits-2));
2953 res += 1LL << (3*(bits-2));
2954 res <<= bits;
2955 if (res > upper_limit)
2956 res = upper_limit;
0fc1b451
AK		 2957
2958 if (res > MAX_LFS_FILESIZE)
2959 res = MAX_LFS_FILESIZE;
2960
ac27a0ec
DK		 2961 return res;
2962}
2963
617ba13b 2964static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2965 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2966{
617ba13b 2967 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2968 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2969 int has_super = 0;
2970
2971 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2972
e2b911c5 2973 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2974 return logical_sb_block + nr + 1;
ac27a0ec 2975 bg = sbi->s_desc_per_block * nr;
617ba13b 2976 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2977 has_super = 1;
0b8e58a1 2978
bd63f6b0
DW		 2979 /*
2980 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2981 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2982 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2983 * compensate.
2984 */
2985 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 2986 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 2987 has_super++;
2988
617ba13b 2989 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2990}
2991
c9de560d
AT		 2992/**
2993 * ext4_get_stripe_size: Get the stripe size.
2994 * @sbi: In memory super block info
2995 *
2996 * If we have specified it via mount option, then
2997 * use the mount option value. If the value specified at mount time is
2998 * greater than the blocks per group use the super block value.
2999 * If the super block value is greater than blocks per group return 0.
3000 * Allocator needs it be less than blocks per group.
3001 *
3002 */
3003static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3004{
3005 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3006 unsigned long stripe_width =
3007 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 3008 int ret;
c9de560d
AT		 3009
3010 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 3011 ret = sbi->s_stripe;
5469d7c3 3012 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 3013 ret = stripe_width;
5469d7c3 3014 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 3015 ret = stride;
3016 else
3017 ret = 0;
c9de560d 3018
3eb08658
DE		 3019 /*
3020 * If the stripe width is 1, this makes no sense and
3021 * we set it to 0 to turn off stripe handling code.
3022 */
3023 if (ret <= 1)
3024 ret = 0;
c9de560d 3025
3eb08658 3026 return ret;
c9de560d 3027}
ac27a0ec 3028
a13fb1a4
ES		 3029/*
3030 * Check whether this filesystem can be mounted based on
3031 * the features present and the RDONLY/RDWR mount requested.
3032 * Returns 1 if this filesystem can be mounted as requested,
3033 * 0 if it cannot be.
3034 */
3035static int ext4_feature_set_ok(struct super_block *sb, int readonly)
3036{
e2b911c5 3037 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 3038 ext4_msg(sb, KERN_ERR,
3039 "Couldn't mount because of "
3040 "unsupported optional features (%x)",
3041 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3042 ~EXT4_FEATURE_INCOMPAT_SUPP));
3043 return 0;
3044 }
3045
c83ad55e
GKB		 3046#ifndef CONFIG_UNICODE
3047 if (ext4_has_feature_casefold(sb)) {
3048 ext4_msg(sb, KERN_ERR,
3049 "Filesystem with casefold feature cannot be "
3050 "mounted without CONFIG_UNICODE");
3051 return 0;
3052 }
3053#endif
3054
a13fb1a4
ES		 3055 if (readonly)
3056 return 1;
3057
e2b911c5 3058 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 3059 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 3060 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 3061 return 1;
3062 }
3063
a13fb1a4 3064 /* Check that feature set is OK for a read-write mount */
e2b911c5 3065 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 3066 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3067 "unsupported optional features (%x)",
3068 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3069 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3070 return 0;
3071 }
e2b911c5 3072 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 3073 ext4_msg(sb, KERN_ERR,
3074 "Can't support bigalloc feature without "
3075 "extents feature\n");
3076 return 0;
3077 }
7c319d32 3078
9db176bc 3079#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
d65d87a0
TT		 3080 if (!readonly && (ext4_has_feature_quota(sb) ||
3081 ext4_has_feature_project(sb))) {
7c319d32 3082 ext4_msg(sb, KERN_ERR,
d65d87a0 3083 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
689c958c
LX		 3084 return 0;
3085 }
7c319d32 3086#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 3087 return 1;
3088}
3089
66e61a9e
TT		 3090/*
3091 * This function is called once a day if we have errors logged
3092 * on the file system
3093 */
235699a8 3094static void print_daily_error_info(struct timer_list *t)
66e61a9e 3095{
235699a8
KC		 3096 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3097 struct super_block *sb = sbi->s_sb;
3098 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 3099
3100 if (es->s_error_count)
ae0f78de
TT		 3101 /* fsck newer than v1.41.13 is needed to clean this condition. */
3102 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 3103 le32_to_cpu(es->s_error_count));
3104 if (es->s_first_error_time) {
6a0678a7
AB		 3105 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3106 sb->s_id,
3107 ext4_get_tstamp(es, s_first_error_time),
66e61a9e
TT		 3108 (int) sizeof(es->s_first_error_func),
3109 es->s_first_error_func,
3110 le32_to_cpu(es->s_first_error_line));
3111 if (es->s_first_error_ino)
651e1c3b 3112 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3113 le32_to_cpu(es->s_first_error_ino));
3114 if (es->s_first_error_block)
651e1c3b 3115 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3116 le64_to_cpu(es->s_first_error_block));
651e1c3b 3117 printk(KERN_CONT "\n");
66e61a9e
TT		 3118 }
3119 if (es->s_last_error_time) {
6a0678a7
AB		 3120 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3121 sb->s_id,
3122 ext4_get_tstamp(es, s_last_error_time),
66e61a9e
TT		 3123 (int) sizeof(es->s_last_error_func),
3124 es->s_last_error_func,
3125 le32_to_cpu(es->s_last_error_line));
3126 if (es->s_last_error_ino)
651e1c3b 3127 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3128 le32_to_cpu(es->s_last_error_ino));
3129 if (es->s_last_error_block)
651e1c3b 3130 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3131 le64_to_cpu(es->s_last_error_block));
651e1c3b 3132 printk(KERN_CONT "\n");
66e61a9e
TT		 3133 }
3134 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3135}
3136
bfff6873
LC		 3137/* Find next suitable group and run ext4_init_inode_table */
3138static int ext4_run_li_request(struct ext4_li_request *elr)
3139{
3140 struct ext4_group_desc *gdp = NULL;
3141 ext4_group_t group, ngroups;
3142 struct super_block *sb;
3143 unsigned long timeout = 0;
3144 int ret = 0;
3145
3146 sb = elr->lr_super;
3147 ngroups = EXT4_SB(sb)->s_groups_count;
3148
3149 for (group = elr->lr_next_group; group < ngroups; group++) {
3150 gdp = ext4_get_group_desc(sb, group, NULL);
3151 if (!gdp) {
3152 ret = 1;
3153 break;
3154 }
3155
3156 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3157 break;
3158 }
3159
7f511862 3160 if (group >= ngroups)
bfff6873
LC		 3161 ret = 1;
3162
3163 if (!ret) {
3164 timeout = jiffies;
3165 ret = ext4_init_inode_table(sb, group,
3166 elr->lr_timeout ? 0 : 1);
3167 if (elr->lr_timeout == 0) {
51ce6511
LC		 3168 timeout = (jiffies - timeout) *
3169 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 3170 elr->lr_timeout = timeout;
3171 }
3172 elr->lr_next_sched = jiffies + elr->lr_timeout;
3173 elr->lr_next_group = group + 1;
3174 }
bfff6873
LC		 3175 return ret;
3176}
3177
3178/*
3179 * Remove lr_request from the list_request and free the
4ed5c033 3180 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 3181 */
3182static void ext4_remove_li_request(struct ext4_li_request *elr)
3183{
3184 struct ext4_sb_info *sbi;
3185
3186 if (!elr)
3187 return;
3188
3189 sbi = elr->lr_sbi;
3190
3191 list_del(&elr->lr_request);
3192 sbi->s_li_request = NULL;
3193 kfree(elr);
3194}
3195
3196static void ext4_unregister_li_request(struct super_block *sb)
3197{
1bb933fb
LC		 3198 mutex_lock(&ext4_li_mtx);
3199 if (!ext4_li_info) {
3200 mutex_unlock(&ext4_li_mtx);
bfff6873 3201 return;
1bb933fb 3202 }
bfff6873
LC		 3203
3204 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3205 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3206 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3207 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3208}
3209
8f1f7453
ES		 3210static struct task_struct *ext4_lazyinit_task;
3211
bfff6873
LC		 3212/*
3213 * This is the function where ext4lazyinit thread lives. It walks
3214 * through the request list searching for next scheduled filesystem.
3215 * When such a fs is found, run the lazy initialization request
3216 * (ext4_rn_li_request) and keep track of the time spend in this
3217 * function. Based on that time we compute next schedule time of
3218 * the request. When walking through the list is complete, compute
3219 * next waking time and put itself into sleep.
3220 */
3221static int ext4_lazyinit_thread(void *arg)
3222{
3223 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3224 struct list_head *pos, *n;
3225 struct ext4_li_request *elr;
4ed5c033 3226 unsigned long next_wakeup, cur;
bfff6873
LC		 3227
3228 BUG_ON(NULL == eli);
3229
bfff6873
LC		 3230cont_thread:
3231 while (true) {
3232 next_wakeup = MAX_JIFFY_OFFSET;
3233
3234 mutex_lock(&eli->li_list_mtx);
3235 if (list_empty(&eli->li_request_list)) {
3236 mutex_unlock(&eli->li_list_mtx);
3237 goto exit_thread;
3238 }
bfff6873 3239 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3240 int err = 0;
3241 int progress = 0;
bfff6873
LC		 3242 elr = list_entry(pos, struct ext4_li_request,
3243 lr_request);
3244
e22834f0
DM		 3245 if (time_before(jiffies, elr->lr_next_sched)) {
3246 if (time_before(elr->lr_next_sched, next_wakeup))
3247 next_wakeup = elr->lr_next_sched;
3248 continue;
3249 }
3250 if (down_read_trylock(&elr->lr_super->s_umount)) {
3251 if (sb_start_write_trylock(elr->lr_super)) {
3252 progress = 1;
3253 /*
3254 * We hold sb->s_umount, sb can not
3255 * be removed from the list, it is
3256 * now safe to drop li_list_mtx
3257 */
3258 mutex_unlock(&eli->li_list_mtx);
3259 err = ext4_run_li_request(elr);
3260 sb_end_write(elr->lr_super);
3261 mutex_lock(&eli->li_list_mtx);
3262 n = pos->next;
b2c78cd0 3263 }
e22834f0
DM		 3264 up_read((&elr->lr_super->s_umount));
3265 }
3266 /* error, remove the lazy_init job */
3267 if (err) {
3268 ext4_remove_li_request(elr);
3269 continue;
3270 }
3271 if (!progress) {
3272 elr->lr_next_sched = jiffies +
3273 (prandom_u32()
3274 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3275 }
bfff6873
LC		 3276 if (time_before(elr->lr_next_sched, next_wakeup))
3277 next_wakeup = elr->lr_next_sched;
3278 }
3279 mutex_unlock(&eli->li_list_mtx);
3280
a0acae0e 3281 try_to_freeze();
bfff6873 3282
4ed5c033
LC		 3283 cur = jiffies;
3284 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3285 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3286 cond_resched();
3287 continue;
3288 }
3289
4ed5c033
LC		 3290 schedule_timeout_interruptible(next_wakeup - cur);
3291
8f1f7453
ES		 3292 if (kthread_should_stop()) {
3293 ext4_clear_request_list();
3294 goto exit_thread;
3295 }
bfff6873
LC		 3296 }
3297
3298exit_thread:
3299 /*
3300 * It looks like the request list is empty, but we need
3301 * to check it under the li_list_mtx lock, to prevent any
3302 * additions into it, and of course we should lock ext4_li_mtx
3303 * to atomically free the list and ext4_li_info, because at
3304 * this point another ext4 filesystem could be registering
3305 * new one.
3306 */
3307 mutex_lock(&ext4_li_mtx);
3308 mutex_lock(&eli->li_list_mtx);
3309 if (!list_empty(&eli->li_request_list)) {
3310 mutex_unlock(&eli->li_list_mtx);
3311 mutex_unlock(&ext4_li_mtx);
3312 goto cont_thread;
3313 }
3314 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3315 kfree(ext4_li_info);
3316 ext4_li_info = NULL;
3317 mutex_unlock(&ext4_li_mtx);
3318
3319 return 0;
3320}
3321
3322static void ext4_clear_request_list(void)
3323{
3324 struct list_head *pos, *n;
3325 struct ext4_li_request *elr;
3326
3327 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3328 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3329 elr = list_entry(pos, struct ext4_li_request,
3330 lr_request);
3331 ext4_remove_li_request(elr);
3332 }
3333 mutex_unlock(&ext4_li_info->li_list_mtx);
3334}
3335
3336static int ext4_run_lazyinit_thread(void)
3337{
8f1f7453
ES		 3338 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3339 ext4_li_info, "ext4lazyinit");
3340 if (IS_ERR(ext4_lazyinit_task)) {
3341 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3342 ext4_clear_request_list();
bfff6873
LC		 3343 kfree(ext4_li_info);
3344 ext4_li_info = NULL;
92b97816 3345 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3346 "initialization thread\n",
3347 err);
3348 return err;
3349 }
3350 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3351 return 0;
3352}
3353
3354/*
3355 * Check whether it make sense to run itable init. thread or not.
3356 * If there is at least one uninitialized inode table, return
3357 * corresponding group number, else the loop goes through all
3358 * groups and return total number of groups.
3359 */
3360static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3361{
3362 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3363 struct ext4_group_desc *gdp = NULL;
3364
8844618d
TT		 3365 if (!ext4_has_group_desc_csum(sb))
3366 return ngroups;
3367
bfff6873
LC		 3368 for (group = 0; group < ngroups; group++) {
3369 gdp = ext4_get_group_desc(sb, group, NULL);
3370 if (!gdp)
3371 continue;
3372
50122847 3373 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3374 break;
3375 }
3376
3377 return group;
3378}
3379
3380static int ext4_li_info_new(void)
3381{
3382 struct ext4_lazy_init *eli = NULL;
3383
3384 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3385 if (!eli)
3386 return -ENOMEM;
3387
bfff6873
LC		 3388 INIT_LIST_HEAD(&eli->li_request_list);
3389 mutex_init(&eli->li_list_mtx);
3390
bfff6873
LC		 3391 eli->li_state |= EXT4_LAZYINIT_QUIT;
3392
3393 ext4_li_info = eli;
3394
3395 return 0;
3396}
3397
3398static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3399 ext4_group_t start)
3400{
3401 struct ext4_sb_info *sbi = EXT4_SB(sb);
3402 struct ext4_li_request *elr;
bfff6873
LC		 3403
3404 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3405 if (!elr)
3406 return NULL;
3407
3408 elr->lr_super = sb;
3409 elr->lr_sbi = sbi;
3410 elr->lr_next_group = start;
3411
3412 /*
3413 * Randomize first schedule time of the request to
3414 * spread the inode table initialization requests
3415 * better.
3416 */
dd1f723b
TT		 3417 elr->lr_next_sched = jiffies + (prandom_u32() %
3418 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3419 return elr;
3420}
3421
7f511862
TT		 3422int ext4_register_li_request(struct super_block *sb,
3423 ext4_group_t first_not_zeroed)
bfff6873
LC		 3424{
3425 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3426 struct ext4_li_request *elr = NULL;
49598e04 3427 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3428 int ret = 0;
bfff6873 3429
7f511862 3430 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3431 if (sbi->s_li_request != NULL) {
3432 /*
3433 * Reset timeout so it can be computed again, because
3434 * s_li_wait_mult might have changed.
3435 */
3436 sbi->s_li_request->lr_timeout = 0;
7f511862 3437 goto out;
51ce6511 3438 }
bfff6873 3439
bc98a42c 3440 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
55ff3840 3441 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3442 goto out;
bfff6873
LC		 3443
3444 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3445 if (!elr) {
3446 ret = -ENOMEM;
3447 goto out;
3448 }
bfff6873
LC		 3449
3450 if (NULL == ext4_li_info) {
3451 ret = ext4_li_info_new();
3452 if (ret)
3453 goto out;
3454 }
3455
3456 mutex_lock(&ext4_li_info->li_list_mtx);
3457 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3458 mutex_unlock(&ext4_li_info->li_list_mtx);
3459
3460 sbi->s_li_request = elr;
46e4690b
TM		 3461 /*
3462 * set elr to NULL here since it has been inserted to
3463 * the request_list and the removal and free of it is
3464 * handled by ext4_clear_request_list from now on.
3465 */
3466 elr = NULL;
bfff6873
LC		 3467
3468 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3469 ret = ext4_run_lazyinit_thread();
3470 if (ret)
3471 goto out;
3472 }
bfff6873 3473out:
beed5ecb
NK		 3474 mutex_unlock(&ext4_li_mtx);
3475 if (ret)
bfff6873 3476 kfree(elr);
bfff6873
LC		 3477 return ret;
3478}
3479
3480/*
3481 * We do not need to lock anything since this is called on
3482 * module unload.
3483 */
3484static void ext4_destroy_lazyinit_thread(void)
3485{
3486 /*
3487 * If thread exited earlier
3488 * there's nothing to be done.
3489 */
8f1f7453 3490 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3491 return;
3492
8f1f7453 3493 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3494}
3495
25ed6e8a
DW		 3496static int set_journal_csum_feature_set(struct super_block *sb)
3497{
3498 int ret = 1;
3499 int compat, incompat;
3500 struct ext4_sb_info *sbi = EXT4_SB(sb);
3501
9aa5d32b 3502 if (ext4_has_metadata_csum(sb)) {
db9ee220 3503 /* journal checksum v3 */
25ed6e8a 3504 compat = 0;
db9ee220 3505 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3506 } else {
3507 /* journal checksum v1 */
3508 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3509 incompat = 0;
3510 }
3511
feb8c6d3
DW		 3512 jbd2_journal_clear_features(sbi->s_journal,
3513 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3514 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3515 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3516 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3517 ret = jbd2_journal_set_features(sbi->s_journal,
3518 compat, 0,
3519 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3520 incompat);
3521 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3522 ret = jbd2_journal_set_features(sbi->s_journal,
3523 compat, 0,
3524 incompat);
3525 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3526 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3527 } else {
feb8c6d3
DW		 3528 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3529 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3530 }
3531
3532 return ret;
3533}
3534
952fc18e
TT		 3535/*
3536 * Note: calculating the overhead so we can be compatible with
3537 * historical BSD practice is quite difficult in the face of
3538 * clusters/bigalloc. This is because multiple metadata blocks from
3539 * different block group can end up in the same allocation cluster.
3540 * Calculating the exact overhead in the face of clustered allocation
3541 * requires either O(all block bitmaps) in memory or O(number of block
3542 * groups**2) in time. We will still calculate the superblock for
3543 * older file systems --- and if we come across with a bigalloc file
3544 * system with zero in s_overhead_clusters the estimate will be close to
3545 * correct especially for very large cluster sizes --- but for newer
3546 * file systems, it's better to calculate this figure once at mkfs
3547 * time, and store it in the superblock. If the superblock value is
3548 * present (even for non-bigalloc file systems), we will use it.
3549 */
3550static int count_overhead(struct super_block *sb, ext4_group_t grp,
3551 char *buf)
3552{
3553 struct ext4_sb_info *sbi = EXT4_SB(sb);
3554 struct ext4_group_desc *gdp;
3555 ext4_fsblk_t first_block, last_block, b;
3556 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3557 int s, j, count = 0;
3558
e2b911c5 3559 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3560 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3561 sbi->s_itb_per_group + 2);
3562
952fc18e
TT		 3563 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3564 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3565 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3566 for (i = 0; i < ngroups; i++) {
3567 gdp = ext4_get_group_desc(sb, i, NULL);
3568 b = ext4_block_bitmap(sb, gdp);
3569 if (b >= first_block && b <= last_block) {
3570 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3571 count++;
3572 }
3573 b = ext4_inode_bitmap(sb, gdp);
3574 if (b >= first_block && b <= last_block) {
3575 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3576 count++;
3577 }
3578 b = ext4_inode_table(sb, gdp);
3579 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3580 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3581 int c = EXT4_B2C(sbi, b - first_block);
3582 ext4_set_bit(c, buf);
3583 count++;
3584 }
3585 if (i != grp)
3586 continue;
3587 s = 0;
3588 if (ext4_bg_has_super(sb, grp)) {
3589 ext4_set_bit(s++, buf);
3590 count++;
3591 }
c48ae41b
TT		 3592 j = ext4_bg_num_gdb(sb, grp);
3593 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3594 ext4_error(sb, "Invalid number of block group "
3595 "descriptor blocks: %d", j);
3596 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3597 }
c48ae41b
TT		 3598 count += j;
3599 for (; j > 0; j--)
3600 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3601 }
3602 if (!count)
3603 return 0;
3604 return EXT4_CLUSTERS_PER_GROUP(sb) -
3605 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3606}
3607
3608/*
3609 * Compute the overhead and stash it in sbi->s_overhead
3610 */
3611int ext4_calculate_overhead(struct super_block *sb)
3612{
3613 struct ext4_sb_info *sbi = EXT4_SB(sb);
3614 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3615 struct inode *j_inode;
3616 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3617 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3618 ext4_fsblk_t overhead = 0;
4fdb5543 3619 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3620
952fc18e
TT		 3621 if (!buf)
3622 return -ENOMEM;
3623
3624 /*
3625 * Compute the overhead (FS structures). This is constant
3626 * for a given filesystem unless the number of block groups
3627 * changes so we cache the previous value until it does.
3628 */
3629
3630 /*
3631 * All of the blocks before first_data_block are overhead
3632 */
3633 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3634
3635 /*
3636 * Add the overhead found in each block group
3637 */
3638 for (i = 0; i < ngroups; i++) {
3639 int blks;
3640
3641 blks = count_overhead(sb, i, buf);
3642 overhead += blks;
3643 if (blks)
3644 memset(buf, 0, PAGE_SIZE);
3645 cond_resched();
3646 }
3c816ded
EW		 3647
3648 /*
3649 * Add the internal journal blocks whether the journal has been
3650 * loaded or not
3651 */
b003b524 3652 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3653 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
f1eec3b0
RH		 3654 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
3655 /* j_inum for internal journal is non-zero */
3c816ded
EW		 3656 j_inode = ext4_get_journal_inode(sb, j_inum);
3657 if (j_inode) {
3658 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3659 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3660 iput(j_inode);
3661 } else {
3662 ext4_msg(sb, KERN_ERR, "can't get journal size");
3663 }
3664 }
952fc18e
TT		 3665 sbi->s_overhead = overhead;
3666 smp_wmb();
3667 free_page((unsigned long) buf);
3668 return 0;
3669}
3670
b5799018 3671static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3672{
3673 ext4_fsblk_t resv_clusters;
b5799018 3674 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3675
30fac0f7
JK		 3676 /*
3677 * There's no need to reserve anything when we aren't using extents.
3678 * The space estimates are exact, there are no unwritten extents,
3679 * hole punching doesn't need new metadata... This is needed especially
3680 * to keep ext2/3 backward compatibility.
3681 */
e2b911c5 3682 if (!ext4_has_feature_extents(sb))
b5799018 3683 return;
27dd4385
LC		 3684 /*
3685 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3686 * This should cover the situations where we can not afford to run
3687 * out of space like for example punch hole, or converting
556615dc 3688 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3689 * allocation would require 1, or 2 blocks, higher numbers are
3690 * very rare.
3691 */
b5799018
TT		 3692 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3693 sbi->s_cluster_bits);
27dd4385
LC		 3694
3695 do_div(resv_clusters, 50);
3696 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3697
b5799018 3698 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3699}
3700
2b2d6d01 3701static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3702{
5e405595 3703 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3704 char *orig_data = kstrdup(data, GFP_KERNEL);
1d0c3924 3705 struct buffer_head *bh, **group_desc;
617ba13b 3706 struct ext4_super_block *es = NULL;
5aee0f8a 3707 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
7c990728 3708 struct flex_groups **flex_groups;
617ba13b
MC		 3709 ext4_fsblk_t block;
3710 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3711 ext4_fsblk_t logical_sb_block;
ac27a0ec 3712 unsigned long offset = 0;
ac27a0ec
DK		 3713 unsigned long journal_devnum = 0;
3714 unsigned long def_mount_opts;
3715 struct inode *root;
0390131b 3716 const char *descr;
dcc7dae3 3717 int ret = -ENOMEM;
281b5995 3718 int blocksize, clustersize;
4ec11028
TT		 3719 unsigned int db_count;
3720 unsigned int i;
ef5fd681 3721 int needs_recovery, has_huge_files;
bd81d8ee 3722 __u64 blocks_count;
07aa2ea1 3723 int err = 0;
b3881f74 3724 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3725 ext4_group_t first_not_zeroed;
ac27a0ec 3726
5aee0f8a
TT		 3727 if ((data && !orig_data) || !sbi)
3728 goto out_free_base;
705895b6 3729
aed9eb1b 3730 sbi->s_daxdev = dax_dev;
705895b6
PE		 3731 sbi->s_blockgroup_lock =
3732 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3733 if (!sbi->s_blockgroup_lock)
3734 goto out_free_base;
3735
ac27a0ec 3736 sb->s_fs_info = sbi;
2c0544b2 3737 sbi->s_sb = sb;
240799cd 3738 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3739 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3740 if (sb->s_bdev->bd_part)
3741 sbi->s_sectors_written_start =
dbae2c55 3742 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
ac27a0ec 3743
9f6200bb 3744 /* Cleanup superblock name */
ec3904dc 3745 strreplace(sb->s_id, '/', '!');
9f6200bb 3746
07aa2ea1 3747 /* -EINVAL is default */
dcc7dae3 3748 ret = -EINVAL;
617ba13b 3749 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3750 if (!blocksize) {
b31e1552 3751 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3752 goto out_fail;
3753 }
3754
3755 /*
617ba13b 3756 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3757 * block sizes. We need to calculate the offset from buffer start.
3758 */
617ba13b 3759 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3760 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3761 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3762 } else {
70bbb3e0 3763 logical_sb_block = sb_block;
ac27a0ec
DK		 3764 }
3765
a8ac900b 3766 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3767 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3768 goto out_fail;
3769 }
3770 /*
3771 * Note: s_es must be initialized as soon as possible because
617ba13b 3772 * some ext4 macro-instructions depend on its value
ac27a0ec 3773 */
2716b802 3774 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3775 sbi->s_es = es;
3776 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3777 if (sb->s_magic != EXT4_SUPER_MAGIC)
3778 goto cantfind_ext4;
afc32f7e 3779 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3780
feb0ab32 3781 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3782 if (ext4_has_feature_metadata_csum(sb) &&
3783 ext4_has_feature_gdt_csum(sb))
363307e6 3784 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3785 "redundant flags; please run fsck.");
3786
d25425f8
DW		 3787 /* Check for a known checksum algorithm */
3788 if (!ext4_verify_csum_type(sb, es)) {
3789 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3790 "unknown checksum algorithm.");
3791 silent = 1;
3792 goto cantfind_ext4;
3793 }
3794
0441984a 3795 /* Load the checksum driver */
a45403b5
TT		 3796 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3797 if (IS_ERR(sbi->s_chksum_driver)) {
3798 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3799 ret = PTR_ERR(sbi->s_chksum_driver);
3800 sbi->s_chksum_driver = NULL;
3801 goto failed_mount;
0441984a
DW		 3802 }
3803
a9c47317
DW		 3804 /* Check superblock checksum */
3805 if (!ext4_superblock_csum_verify(sb, es)) {
3806 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3807 "invalid superblock checksum. Run e2fsck?");
3808 silent = 1;
6a797d27 3809 ret = -EFSBADCRC;
a9c47317
DW		 3810 goto cantfind_ext4;
3811 }
3812
3813 /* Precompute checksum seed for all metadata */
e2b911c5 3814 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3815 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3816 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3817 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3818 sizeof(es->s_uuid));
3819
ac27a0ec
DK		 3820 /* Set defaults before we parse the mount options */
3821 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3822 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3823 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3824 set_opt(sb, DEBUG);
87f26807 3825 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3826 set_opt(sb, GRPID);
617ba13b 3827 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3828 set_opt(sb, NO_UID32);
ea663336 3829 /* xattr user namespace & acls are now defaulted on */
ea663336 3830 set_opt(sb, XATTR_USER);
03010a33 3831#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3832 set_opt(sb, POSIX_ACL);
2e7842b8 3833#endif
98c1a759
DW		 3834 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3835 if (ext4_has_metadata_csum(sb))
3836 set_opt(sb, JOURNAL_CHECKSUM);
3837
617ba13b 3838 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3839 set_opt(sb, JOURNAL_DATA);
617ba13b 3840 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3841 set_opt(sb, ORDERED_DATA);
617ba13b 3842 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3843 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3844
3845 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3846 set_opt(sb, ERRORS_PANIC);
bb4f397a 3847 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3848 set_opt(sb, ERRORS_CONT);
bb4f397a 3849 else
fd8c37ec 3850 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3851 /* block_validity enabled by default; disable with noblock_validity */
3852 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3853 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3854 set_opt(sb, DISCARD);
ac27a0ec 3855
08cefc7a
EB		 3856 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3857 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3858 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3859 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3860 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3861
8b67f04a 3862 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3863 set_opt(sb, BARRIER);
ac27a0ec 3864
dd919b98
AK		 3865 /*
3866 * enable delayed allocation by default
3867 * Use -o nodelalloc to turn it off
3868 */
bc0b75f7 3869 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3870 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3871 set_opt(sb, DELALLOC);
dd919b98 3872
51ce6511
LC		 3873 /*
3874 * set default s_li_wait_mult for lazyinit, for the case there is
3875 * no mount option specified.
3876 */
3877 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3878
4f97a681 3879 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
626b035b
RH		 3880
3881 if (blocksize == PAGE_SIZE)
3882 set_opt(sb, DIOREAD_NOLOCK);
3883
4f97a681
TT		 3884 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3885 blocksize > EXT4_MAX_BLOCK_SIZE) {
3886 ext4_msg(sb, KERN_ERR,
3887 "Unsupported filesystem blocksize %d (%d log_block_size)",
3888 blocksize, le32_to_cpu(es->s_log_block_size));
3889 goto failed_mount;
3890 }
3891
9803387c
TT		 3892 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3893 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3894 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3895 } else {
3896 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3897 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3898 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3899 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3900 sbi->s_first_ino);
3901 goto failed_mount;
3902 }
3903 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3904 (!is_power_of_2(sbi->s_inode_size)) ||
3905 (sbi->s_inode_size > blocksize)) {
3906 ext4_msg(sb, KERN_ERR,
3907 "unsupported inode size: %d",
3908 sbi->s_inode_size);
4f97a681 3909 ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
9803387c
TT		 3910 goto failed_mount;
3911 }
3912 /*
3913 * i_atime_extra is the last extra field available for
3914 * [acm]times in struct ext4_inode. Checking for that
3915 * field should suffice to ensure we have extra space
3916 * for all three.
3917 */
3918 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
3919 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
3920 sb->s_time_gran = 1;
3921 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
3922 } else {
3923 sb->s_time_gran = NSEC_PER_SEC;
3924 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
3925 }
3926 sb->s_time_min = EXT4_TIMESTAMP_MIN;
3927 }
3928 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3929 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3930 EXT4_GOOD_OLD_INODE_SIZE;
3931 if (ext4_has_feature_extra_isize(sb)) {
3932 unsigned v, max = (sbi->s_inode_size -
3933 EXT4_GOOD_OLD_INODE_SIZE);
3934
3935 v = le16_to_cpu(es->s_want_extra_isize);
3936 if (v > max) {
3937 ext4_msg(sb, KERN_ERR,
3938 "bad s_want_extra_isize: %d", v);
3939 goto failed_mount;
3940 }
3941 if (sbi->s_want_extra_isize < v)
3942 sbi->s_want_extra_isize = v;
3943
3944 v = le16_to_cpu(es->s_min_extra_isize);
3945 if (v > max) {
3946 ext4_msg(sb, KERN_ERR,
3947 "bad s_min_extra_isize: %d", v);
3948 goto failed_mount;
3949 }
3950 if (sbi->s_want_extra_isize < v)
3951 sbi->s_want_extra_isize = v;
3952 }
3953 }
3954
5aee0f8a
TT		 3955 if (sbi->s_es->s_mount_opts[0]) {
3956 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3957 sizeof(sbi->s_es->s_mount_opts),
3958 GFP_KERNEL);
3959 if (!s_mount_opts)
3960 goto failed_mount;
3961 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3962 &journal_ioprio, 0)) {
3963 ext4_msg(sb, KERN_WARNING,
3964 "failed to parse options in superblock: %s",
3965 s_mount_opts);
3966 }
3967 kfree(s_mount_opts);
8b67f04a 3968 }
5a916be1 3969 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3970 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3971 &journal_ioprio, 0))
ac27a0ec
DK		 3972 goto failed_mount;
3973
c83ad55e
GKB		 3974#ifdef CONFIG_UNICODE
3975 if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
3976 const struct ext4_sb_encodings *encoding_info;
3977 struct unicode_map *encoding;
3978 __u16 encoding_flags;
3979
3980 if (ext4_has_feature_encrypt(sb)) {
3981 ext4_msg(sb, KERN_ERR,
3982 "Can't mount with encoding and encryption");
3983 goto failed_mount;
3984 }
3985
3986 if (ext4_sb_read_encoding(es, &encoding_info,
3987 &encoding_flags)) {
3988 ext4_msg(sb, KERN_ERR,
3989 "Encoding requested by superblock is unknown");
3990 goto failed_mount;
3991 }
3992
3993 encoding = utf8_load(encoding_info->version);
3994 if (IS_ERR(encoding)) {
3995 ext4_msg(sb, KERN_ERR,
3996 "can't mount with superblock charset: %s-%s "
3997 "not supported by the kernel. flags: 0x%x.",
3998 encoding_info->name, encoding_info->version,
3999 encoding_flags);
4000 goto failed_mount;
4001 }
4002 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4003 "%s-%s with flags 0x%hx", encoding_info->name,
4004 encoding_info->version?:"\b", encoding_flags);
4005
4006 sbi->s_encoding = encoding;
4007 sbi->s_encoding_flags = encoding_flags;
4008 }
4009#endif
4010
56889787 4011 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
244adf64 4012 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, and O_DIRECT support!\n");
781c036b 4013 /* can't mount with both data=journal and dioread_nolock. */
244adf64 4014 clear_opt(sb, DIOREAD_NOLOCK);
56889787
TT		 4015 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4016 ext4_msg(sb, KERN_ERR, "can't mount with "
4017 "both data=journal and delalloc");
4018 goto failed_mount;
4019 }
923ae0ff
RZ		 4020 if (test_opt(sb, DAX)) {
4021 ext4_msg(sb, KERN_ERR, "can't mount with "
4022 "both data=journal and dax");
4023 goto failed_mount;
4024 }
73b92a2a
SK		 4025 if (ext4_has_feature_encrypt(sb)) {
4026 ext4_msg(sb, KERN_WARNING,
4027 "encrypted files will use data=ordered "
4028 "instead of data journaling mode");
4029 }
56889787
TT		 4030 if (test_opt(sb, DELALLOC))
4031 clear_opt(sb, DELALLOC);
001e4a87
TH		 4032 } else {
4033 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 4034 }
4035
1751e8a6
LT		 4036 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
4037 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 4038
617ba13b 4039 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 4040 (ext4_has_compat_features(sb) ||
4041 ext4_has_ro_compat_features(sb) ||
4042 ext4_has_incompat_features(sb)))
b31e1552
ES		 4043 ext4_msg(sb, KERN_WARNING,
4044 "feature flags set on rev 0 fs, "
4045 "running e2fsck is recommended");
469108ff 4046
ed3654eb
TT		 4047 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4048 set_opt2(sb, HURD_COMPAT);
e2b911c5 4049 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 4050 ext4_msg(sb, KERN_ERR,
4051 "The Hurd can't support 64-bit file systems");
4052 goto failed_mount;
4053 }
dec214d0
TE		 4054
4055 /*
4056 * ea_inode feature uses l_i_version field which is not
4057 * available in HURD_COMPAT mode.
4058 */
4059 if (ext4_has_feature_ea_inode(sb)) {
4060 ext4_msg(sb, KERN_ERR,
4061 "ea_inode feature is not supported for Hurd");
4062 goto failed_mount;
4063 }
ed3654eb
TT		 4064 }
4065
2035e776
TT		 4066 if (IS_EXT2_SB(sb)) {
4067 if (ext2_feature_set_ok(sb))
4068 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4069 "using the ext4 subsystem");
4070 else {
0d9366d6
ES		 4071 /*
4072 * If we're probing be silent, if this looks like
4073 * it's actually an ext[34] filesystem.
4074 */
4075 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4076 goto failed_mount;
2035e776
TT		 4077 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4078 "to feature incompatibilities");
4079 goto failed_mount;
4080 }
4081 }
4082
4083 if (IS_EXT3_SB(sb)) {
4084 if (ext3_feature_set_ok(sb))
4085 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4086 "using the ext4 subsystem");
4087 else {
0d9366d6
ES		 4088 /*
4089 * If we're probing be silent, if this looks like
4090 * it's actually an ext4 filesystem.
4091 */
4092 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4093 goto failed_mount;
2035e776
TT		 4094 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4095 "to feature incompatibilities");
4096 goto failed_mount;
4097 }
4098 }
4099
ac27a0ec
DK		 4100 /*
4101 * Check feature flags regardless of the revision level, since we
4102 * previously didn't change the revision level when setting the flags,
4103 * so there is a chance incompat flags are set on a rev 0 filesystem.
4104 */
bc98a42c 4105 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 4106 goto failed_mount;
a13fb1a4 4107
8cdf3372
TT		 4108 if (le32_to_cpu(es->s_log_block_size) >
4109 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4110 ext4_msg(sb, KERN_ERR,
4111 "Invalid log block size: %u",
4112 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 4113 goto failed_mount;
4114 }
bfe0a5f4
TT		 4115 if (le32_to_cpu(es->s_log_cluster_size) >
4116 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4117 ext4_msg(sb, KERN_ERR,
4118 "Invalid log cluster size: %u",
4119 le32_to_cpu(es->s_log_cluster_size));
4120 goto failed_mount;
4121 }
ac27a0ec 4122
5b9554dc
TT		 4123 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4124 ext4_msg(sb, KERN_ERR,
4125 "Number of reserved GDT blocks insanely large: %d",
4126 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4127 goto failed_mount;
4128 }
4129
923ae0ff 4130 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
559db4c6
RZ		 4131 if (ext4_has_feature_inline_data(sb)) {
4132 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4133 " that may contain inline data");
361d24d4 4134 goto failed_mount;
559db4c6 4135 }
80660f20 4136 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
24f3478d 4137 ext4_msg(sb, KERN_ERR,
361d24d4
ES		 4138 "DAX unsupported by block device.");
4139 goto failed_mount;
24f3478d 4140 }
923ae0ff
RZ		 4141 }
4142
e2b911c5 4143 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 4144 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4145 es->s_encryption_level);
4146 goto failed_mount;
4147 }
4148
ac27a0ec 4149 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 4150 /* Validate the filesystem blocksize */
4151 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 4152 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 4153 blocksize);
ac27a0ec
DK		 4154 goto failed_mount;
4155 }
4156
2b2d6d01 4157 brelse(bh);
70bbb3e0
AM		 4158 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4159 offset = do_div(logical_sb_block, blocksize);
a8ac900b 4160 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 4161 if (!bh) {
b31e1552
ES		 4162 ext4_msg(sb, KERN_ERR,
4163 "Can't read superblock on 2nd try");
ac27a0ec
DK		 4164 goto failed_mount;
4165 }
2716b802 4166 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 4167 sbi->s_es = es;
617ba13b 4168 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 4169 ext4_msg(sb, KERN_ERR,
4170 "Magic mismatch, very weird!");
ac27a0ec
DK		 4171 goto failed_mount;
4172 }
4173 }
4174
e2b911c5 4175 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 4176 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4177 has_huge_files);
4178 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 4179
0d1ee42f 4180 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 4181 if (ext4_has_feature_64bit(sb)) {
8fadc143 4182 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 4183 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 4184 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 4185 ext4_msg(sb, KERN_ERR,
4186 "unsupported descriptor size %lu",
0d1ee42f
AR		 4187 sbi->s_desc_size);
4188 goto failed_mount;
4189 }
4190 } else
4191 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 4192
ac27a0ec 4193 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 4194 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 4195
617ba13b 4196 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 4197 if (sbi->s_inodes_per_block == 0)
617ba13b 4198 goto cantfind_ext4;
cd6bb35b
TT		 4199 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4200 sbi->s_inodes_per_group > blocksize * 8) {
4201 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
b9c538da 4202 sbi->s_inodes_per_group);
cd6bb35b
TT		 4203 goto failed_mount;
4204 }
ac27a0ec
DK		 4205 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4206 sbi->s_inodes_per_block;
0d1ee42f 4207 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 4208 sbi->s_sbh = bh;
4209 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 4210 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4211 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 4212
2b2d6d01 4213 for (i = 0; i < 4; i++)
ac27a0ec
DK		 4214 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4215 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 4216 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 4217 i = le32_to_cpu(es->s_flags);
4218 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4219 sbi->s_hash_unsigned = 3;
4220 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 4221#ifdef __CHAR_UNSIGNED__
bc98a42c 4222 if (!sb_rdonly(sb))
23301410
TT		 4223 es->s_flags |=
4224 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4225 sbi->s_hash_unsigned = 3;
f99b2589 4226#else
bc98a42c 4227 if (!sb_rdonly(sb))
23301410
TT		 4228 es->s_flags |=
4229 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 4230#endif
23301410 4231 }
f99b2589 4232 }
ac27a0ec 4233
281b5995
TT		 4234 /* Handle clustersize */
4235 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
ef5fd681 4236 if (ext4_has_feature_bigalloc(sb)) {
281b5995
TT		 4237 if (clustersize < blocksize) {
4238 ext4_msg(sb, KERN_ERR,
4239 "cluster size (%d) smaller than "
4240 "block size (%d)", clustersize, blocksize);
4241 goto failed_mount;
4242 }
4243 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4244 le32_to_cpu(es->s_log_block_size);
4245 sbi->s_clusters_per_group =
4246 le32_to_cpu(es->s_clusters_per_group);
4247 if (sbi->s_clusters_per_group > blocksize * 8) {
4248 ext4_msg(sb, KERN_ERR,
4249 "#clusters per group too big: %lu",
4250 sbi->s_clusters_per_group);
4251 goto failed_mount;
4252 }
4253 if (sbi->s_blocks_per_group !=
4254 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4255 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4256 "clusters per group (%lu) inconsistent",
4257 sbi->s_blocks_per_group,
4258 sbi->s_clusters_per_group);
4259 goto failed_mount;
4260 }
4261 } else {
4262 if (clustersize != blocksize) {
bfe0a5f4
TT		 4263 ext4_msg(sb, KERN_ERR,
4264 "fragment/cluster size (%d) != "
4265 "block size (%d)", clustersize, blocksize);
4266 goto failed_mount;
281b5995
TT		 4267 }
4268 if (sbi->s_blocks_per_group > blocksize * 8) {
4269 ext4_msg(sb, KERN_ERR,
4270 "#blocks per group too big: %lu",
4271 sbi->s_blocks_per_group);
4272 goto failed_mount;
4273 }
4274 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4275 sbi->s_cluster_bits = 0;
ac27a0ec 4276 }
281b5995
TT		 4277 sbi->s_cluster_ratio = clustersize / blocksize;
4278
960fd856
TT		 4279 /* Do we have standard group size of clustersize * 8 blocks ? */
4280 if (sbi->s_blocks_per_group == clustersize << 3)
4281 set_opt2(sb, STD_GROUP_SIZE);
4282
bf43d84b
ES		 4283 /*
4284 * Test whether we have more sectors than will fit in sector_t,
4285 * and whether the max offset is addressable by the page cache.
4286 */
5a9ae68a 4287 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 4288 ext4_blocks_count(es));
5a9ae68a 4289 if (err) {
b31e1552 4290 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 4291 " too large to mount safely on this system");
ac27a0ec
DK		 4292 goto failed_mount;
4293 }
4294
617ba13b
MC		 4295 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4296 goto cantfind_ext4;
e7c95593 4297
0f2ddca6
FTN		 4298 /* check blocks count against device size */
4299 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4300 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 4301 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4302 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 4303 ext4_blocks_count(es), blocks_count);
4304 goto failed_mount;
4305 }
4306
0b8e58a1
AD		 4307 /*
4308 * It makes no sense for the first data block to be beyond the end
4309 * of the filesystem.
4310 */
4311 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 4312 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 4313 "block %u is beyond end of filesystem (%llu)",
4314 le32_to_cpu(es->s_first_data_block),
4315 ext4_blocks_count(es));
e7c95593
ES		 4316 goto failed_mount;
4317 }
bfe0a5f4
TT		 4318 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4319 (sbi->s_cluster_ratio == 1)) {
4320 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4321 "block is 0 with a 1k block and cluster size");
4322 goto failed_mount;
4323 }
4324
bd81d8ee
LV		 4325 blocks_count = (ext4_blocks_count(es) -
4326 le32_to_cpu(es->s_first_data_block) +
4327 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4328 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 4329 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
df41460a 4330 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4ec11028 4331 "(block count %llu, first data block %u, "
df41460a 4332 "blocks per group %lu)", blocks_count,
4ec11028
TT		 4333 ext4_blocks_count(es),
4334 le32_to_cpu(es->s_first_data_block),
4335 EXT4_BLOCKS_PER_GROUP(sb));
4336 goto failed_mount;
4337 }
bd81d8ee 4338 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 4339 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4340 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
9e463084
TT		 4341 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4342 le32_to_cpu(es->s_inodes_count)) {
4343 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4344 le32_to_cpu(es->s_inodes_count),
4345 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4346 ret = -EINVAL;
4347 goto failed_mount;
4348 }
617ba13b
MC		 4349 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4350 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 4351 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 4352 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 4353 ext4_msg(sb, KERN_WARNING,
4354 "first meta block group too large: %u "
4355 "(group descriptor block count %u)",
4356 le32_to_cpu(es->s_first_meta_bg), db_count);
4357 goto failed_mount;
4358 }
4359 }
1d0c3924
TT		 4360 rcu_assign_pointer(sbi->s_group_desc,
4361 kvmalloc_array(db_count,
4362 sizeof(struct buffer_head *),
4363 GFP_KERNEL));
ac27a0ec 4364 if (sbi->s_group_desc == NULL) {
b31e1552 4365 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4366 ret = -ENOMEM;
ac27a0ec
DK		 4367 goto failed_mount;
4368 }
4369
705895b6 4370 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4371
85c8f176
AP		 4372 /* Pre-read the descriptors into the buffer cache */
4373 for (i = 0; i < db_count; i++) {
4374 block = descriptor_loc(sb, logical_sb_block, i);
d87f6392 4375 sb_breadahead_unmovable(sb, block);
85c8f176
AP		 4376 }
4377
ac27a0ec 4378 for (i = 0; i < db_count; i++) {
1d0c3924
TT		 4379 struct buffer_head *bh;
4380
70bbb3e0 4381 block = descriptor_loc(sb, logical_sb_block, i);
1d0c3924
TT		 4382 bh = sb_bread_unmovable(sb, block);
4383 if (!bh) {
b31e1552
ES		 4384 ext4_msg(sb, KERN_ERR,
4385 "can't read group descriptor %d", i);
ac27a0ec
DK		 4386 db_count = i;
4387 goto failed_mount2;
4388 }
1d0c3924
TT		 4389 rcu_read_lock();
4390 rcu_dereference(sbi->s_group_desc)[i] = bh;
4391 rcu_read_unlock();
ac27a0ec 4392 }
44de022c 4393 sbi->s_gdb_count = db_count;
829fa70d 4394 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4395 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4396 ret = -EFSCORRUPTED;
f9ae9cf5 4397 goto failed_mount2;
ac27a0ec 4398 }
772cb7c8 4399
235699a8 4400 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 4401
a75ae78f 4402 /* Register extent status tree shrinker */
eb68d0e2 4403 if (ext4_es_register_shrinker(sbi))
ce7e010a 4404 goto failed_mount3;
ce7e010a 4405
c9de560d 4406 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4407 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4408
f9ae9cf5
TT		 4409 /*
4410 * set up enough so that it can read an inode
4411 */
f6e63f90 4412 sb->s_op = &ext4_sops;
617ba13b
MC		 4413 sb->s_export_op = &ext4_export_ops;
4414 sb->s_xattr = ext4_xattr_handlers;
643fa961 4415#ifdef CONFIG_FS_ENCRYPTION
a7550b30 4416 sb->s_cop = &ext4_cryptops;
ffcc4182 4417#endif
c93d8f88
EB		 4418#ifdef CONFIG_FS_VERITY
4419 sb->s_vop = &ext4_verityops;
4420#endif
ac27a0ec 4421#ifdef CONFIG_QUOTA
617ba13b 4422 sb->dq_op = &ext4_quota_operations;
e2b911c5 4423 if (ext4_has_feature_quota(sb))
1fa5efe3 4424 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4425 else
4426 sb->s_qcop = &ext4_qctl_operations;
689c958c 4427 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4428#endif
85787090 4429 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4430
ac27a0ec 4431 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4432 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4433
4434 sb->s_root = NULL;
4435
4436 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4437 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4438
bc98a42c 4439 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4440 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4441 goto failed_mount3a;
c5e06d10 4442
ac27a0ec
DK		 4443 /*
4444 * The first inode we look at is the journal inode. Don't try
4445 * root first: it may be modified in the journal!
4446 */
e2b911c5 4447 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4448 err = ext4_load_journal(sb, es, journal_devnum);
4449 if (err)
50460fe8 4450 goto failed_mount3a;
bc98a42c 4451 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4452 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4453 ext4_msg(sb, KERN_ERR, "required journal recovery "
4454 "suppressed and not mounted read-only");
744692dc 4455 goto failed_mount_wq;
ac27a0ec 4456 } else {
1e381f60
DM		 4457 /* Nojournal mode, all journal mount options are illegal */
4458 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4459 ext4_msg(sb, KERN_ERR, "can't mount with "
4460 "journal_checksum, fs mounted w/o journal");
4461 goto failed_mount_wq;
4462 }
4463 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4464 ext4_msg(sb, KERN_ERR, "can't mount with "
4465 "journal_async_commit, fs mounted w/o journal");
4466 goto failed_mount_wq;
4467 }
4468 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4469 ext4_msg(sb, KERN_ERR, "can't mount with "
4470 "commit=%lu, fs mounted w/o journal",
4471 sbi->s_commit_interval / HZ);
4472 goto failed_mount_wq;
4473 }
4474 if (EXT4_MOUNT_DATA_FLAGS &
4475 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4476 ext4_msg(sb, KERN_ERR, "can't mount with "
4477 "data=, fs mounted w/o journal");
4478 goto failed_mount_wq;
4479 }
50b29d8f 4480 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
1e381f60 4481 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4482 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4483 sbi->s_journal = NULL;
4484 needs_recovery = 0;
4485 goto no_journal;
ac27a0ec
DK		 4486 }
4487
e2b911c5 4488 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4489 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4490 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4491 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4492 goto failed_mount_wq;
eb40a09c
JS		 4493 }
4494
25ed6e8a
DW		 4495 if (!set_journal_csum_feature_set(sb)) {
4496 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4497 "feature set");
4498 goto failed_mount_wq;
d4da6c9c 4499 }
818d276c 4500
ac27a0ec
DK		 4501 /* We have now updated the journal if required, so we can
4502 * validate the data journaling mode. */
4503 switch (test_opt(sb, DATA_FLAGS)) {
4504 case 0:
4505 /* No mode set, assume a default based on the journal
63f57933
AM		 4506 * capabilities: ORDERED_DATA if the journal can
4507 * cope, else JOURNAL_DATA
4508 */
dab291af 4509 if (jbd2_journal_check_available_features
27f394a7 4510 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
fd8c37ec 4511 set_opt(sb, ORDERED_DATA);
27f394a7
TN		 4512 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4513 } else {
fd8c37ec 4514 set_opt(sb, JOURNAL_DATA);
27f394a7
TN		 4515 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4516 }
ac27a0ec
DK		 4517 break;
4518
617ba13b
MC		 4519 case EXT4_MOUNT_ORDERED_DATA:
4520 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4521 if (!jbd2_journal_check_available_features
4522 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4523 ext4_msg(sb, KERN_ERR, "Journal does not support "
4524 "requested data journaling mode");
744692dc 4525 goto failed_mount_wq;
ac27a0ec
DK		 4526 }
4527 default:
4528 break;
4529 }
ab04df78
JK		 4530
4531 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4532 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4533 ext4_msg(sb, KERN_ERR, "can't mount with "
4534 "journal_async_commit in data=ordered mode");
4535 goto failed_mount_wq;
4536 }
4537
b3881f74 4538 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4539
18aadd47
BJ		 4540 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4541
ce7e010a 4542no_journal:
cdb7ee4c
TE		 4543 if (!test_opt(sb, NO_MBCACHE)) {
4544 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4545 if (!sbi->s_ea_block_cache) {
dec214d0 4546 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4547 "Failed to create ea_block_cache");
dec214d0
TE		 4548 goto failed_mount_wq;
4549 }
cdb7ee4c
TE		 4550
4551 if (ext4_has_feature_ea_inode(sb)) {
4552 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4553 if (!sbi->s_ea_inode_cache) {
4554 ext4_msg(sb, KERN_ERR,
4555 "Failed to create ea_inode_cache");
4556 goto failed_mount_wq;
4557 }
4558 }
9c191f70
M		 4559 }
4560
c93d8f88
EB		 4561 if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4562 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4563 goto failed_mount_wq;
4564 }
4565
bc98a42c 4566 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4567 !ext4_has_feature_encrypt(sb)) {
4568 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4569 ext4_commit_super(sb, 1);
4570 }
4571
952fc18e
TT		 4572 /*
4573 * Get the # of file system overhead blocks from the
4574 * superblock if present.
4575 */
4576 if (es->s_overhead_clusters)
4577 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4578 else {
07aa2ea1
LC		 4579 err = ext4_calculate_overhead(sb);
4580 if (err)
952fc18e
TT		 4581 goto failed_mount_wq;
4582 }
4583
fd89d5f2
TH		 4584 /*
4585 * The maximum number of concurrent works can be high and
4586 * concurrency isn't really necessary. Limit it to 1.
4587 */
2e8fa54e
JK		 4588 EXT4_SB(sb)->rsv_conversion_wq =
4589 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4590 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4591 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4592 ret = -ENOMEM;
2e8fa54e
JK		 4593 goto failed_mount4;
4594 }
4595
ac27a0ec 4596 /*
dab291af 4597 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4598 * so we can safely mount the rest of the filesystem now.
4599 */
4600
8a363970 4601 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 4602 if (IS_ERR(root)) {
b31e1552 4603 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4604 ret = PTR_ERR(root);
32a9bb57 4605 root = NULL;
ac27a0ec
DK		 4606 goto failed_mount4;
4607 }
4608 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4609 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4610 iput(root);
ac27a0ec
DK		 4611 goto failed_mount4;
4612 }
b886ee3e
GKB		 4613
4614#ifdef CONFIG_UNICODE
4615 if (sbi->s_encoding)
4616 sb->s_d_op = &ext4_dentry_ops;
4617#endif
4618
48fde701 4619 sb->s_root = d_make_root(root);
1d1fe1ee 4620 if (!sb->s_root) {
b31e1552 4621 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4622 ret = -ENOMEM;
4623 goto failed_mount4;
4624 }
ac27a0ec 4625
c89128a0
JK		 4626 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4627 if (ret == -EROFS) {
1751e8a6 4628 sb->s_flags |= SB_RDONLY;
c89128a0
JK		 4629 ret = 0;
4630 } else if (ret)
4631 goto failed_mount4a;
ef7f3835 4632
b5799018 4633 ext4_set_resv_clusters(sb);
27dd4385 4634
6fd058f7
TT		 4635 err = ext4_setup_system_zone(sb);
4636 if (err) {
b31e1552 4637 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4638 "zone (%d)", err);
f9ae9cf5
TT		 4639 goto failed_mount4a;
4640 }
4641
4642 ext4_ext_init(sb);
4643 err = ext4_mb_init(sb);
4644 if (err) {
4645 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4646 err);
dcf2d804 4647 goto failed_mount5;
c2774d84
AK		 4648 }
4649
d5e03cbb
TT		 4650 block = ext4_count_free_clusters(sb);
4651 ext4_free_blocks_count_set(sbi->s_es,
4652 EXT4_C2B(sbi, block));
4274f516 4653 ext4_superblock_csum_set(sb);
908c7f19
TH		 4654 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4655 GFP_KERNEL);
d5e03cbb
TT		 4656 if (!err) {
4657 unsigned long freei = ext4_count_free_inodes(sb);
4658 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4274f516 4659 ext4_superblock_csum_set(sb);
908c7f19
TH		 4660 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4661 GFP_KERNEL);
d5e03cbb
TT		 4662 }
4663 if (!err)
4664 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4665 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4666 if (!err)
908c7f19
TH		 4667 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4668 GFP_KERNEL);
c8585c6f 4669 if (!err)
bbd55937 4670 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
c8585c6f 4671
d5e03cbb
TT		 4672 if (err) {
4673 ext4_msg(sb, KERN_ERR, "insufficient memory");
4674 goto failed_mount6;
4675 }
4676
e2b911c5 4677 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4678 if (!ext4_fill_flex_info(sb)) {
4679 ext4_msg(sb, KERN_ERR,
4680 "unable to initialize "
4681 "flex_bg meta info!");
4682 goto failed_mount6;
4683 }
4684
bfff6873
LC		 4685 err = ext4_register_li_request(sb, first_not_zeroed);
4686 if (err)
dcf2d804 4687 goto failed_mount6;
bfff6873 4688
b5799018 4689 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4690 if (err)
4691 goto failed_mount7;
3197ebdb 4692
9b2ff357
JK		 4693#ifdef CONFIG_QUOTA
4694 /* Enable quota usage during mount. */
bc98a42c 4695 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4696 err = ext4_enable_quotas(sb);
4697 if (err)
4698 goto failed_mount8;
4699 }
4700#endif /* CONFIG_QUOTA */
4701
617ba13b
MC		 4702 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4703 ext4_orphan_cleanup(sb, es);
4704 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4705 if (needs_recovery) {
b31e1552 4706 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4707 ext4_mark_recovery_complete(sb, es);
4708 }
4709 if (EXT4_SB(sb)->s_journal) {
4710 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4711 descr = " journalled data mode";
4712 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4713 descr = " ordered data mode";
4714 else
4715 descr = " writeback data mode";
4716 } else
4717 descr = "out journal";
4718
79add3a3
LC		 4719 if (test_opt(sb, DISCARD)) {
4720 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4721 if (!blk_queue_discard(q))
4722 ext4_msg(sb, KERN_WARNING,
4723 "mounting with \"discard\" option, but "
4724 "the device does not support discard");
4725 }
4726
e294a537
TT		 4727 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4728 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4729 "Opts: %.*s%s%s", descr,
4730 (int) sizeof(sbi->s_es->s_mount_opts),
4731 sbi->s_es->s_mount_opts,
e294a537 4732 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4733
66e61a9e
TT		 4734 if (es->s_error_count)
4735 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4736
efbed4dc
TT		 4737 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4738 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4739 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4740 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4741
d4c402d9 4742 kfree(orig_data);
ac27a0ec
DK		 4743 return 0;
4744
617ba13b 4745cantfind_ext4:
ac27a0ec 4746 if (!silent)
b31e1552 4747 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4748 goto failed_mount;
4749
72ba7450
TT		 4750#ifdef CONFIG_QUOTA
4751failed_mount8:
ebd173be 4752 ext4_unregister_sysfs(sb);
72ba7450 4753#endif
dcf2d804
TM		 4754failed_mount7:
4755 ext4_unregister_li_request(sb);
4756failed_mount6:
f9ae9cf5 4757 ext4_mb_release(sb);
7c990728
SJS		 4758 rcu_read_lock();
4759 flex_groups = rcu_dereference(sbi->s_flex_groups);
4760 if (flex_groups) {
4761 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
4762 kvfree(flex_groups[i]);
4763 kvfree(flex_groups);
4764 }
4765 rcu_read_unlock();
d5e03cbb
TT		 4766 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4767 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4768 percpu_counter_destroy(&sbi->s_dirs_counter);
4769 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
bbd55937 4770 percpu_free_rwsem(&sbi->s_writepages_rwsem);
00764937 4771failed_mount5:
f9ae9cf5
TT		 4772 ext4_ext_release(sb);
4773 ext4_release_system_zone(sb);
4774failed_mount4a:
94bf608a 4775 dput(sb->s_root);
32a9bb57 4776 sb->s_root = NULL;
94bf608a 4777failed_mount4:
b31e1552 4778 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4779 if (EXT4_SB(sb)->rsv_conversion_wq)
4780 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4781failed_mount_wq:
50c15df6
CX		 4782 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4783 sbi->s_ea_inode_cache = NULL;
4784
4785 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4786 sbi->s_ea_block_cache = NULL;
4787
0390131b
FM		 4788 if (sbi->s_journal) {
4789 jbd2_journal_destroy(sbi->s_journal);
4790 sbi->s_journal = NULL;
4791 }
50460fe8 4792failed_mount3a:
d3922a77 4793 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4794failed_mount3:
9105bb14 4795 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4796 if (sbi->s_mmp_tsk)
4797 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 4798failed_mount2:
1d0c3924
TT		 4799 rcu_read_lock();
4800 group_desc = rcu_dereference(sbi->s_group_desc);
ac27a0ec 4801 for (i = 0; i < db_count; i++)
1d0c3924
TT		 4802 brelse(group_desc[i]);
4803 kvfree(group_desc);
4804 rcu_read_unlock();
ac27a0ec 4805failed_mount:
0441984a
DW		 4806 if (sbi->s_chksum_driver)
4807 crypto_free_shash(sbi->s_chksum_driver);
c83ad55e
GKB		 4808
4809#ifdef CONFIG_UNICODE
4810 utf8_unload(sbi->s_encoding);
4811#endif
4812
ac27a0ec 4813#ifdef CONFIG_QUOTA
a2d4a646 4814 for (i = 0; i < EXT4_MAXQUOTAS; i++)
0ba33fac 4815 kfree(get_qf_name(sb, sbi, i));
ac27a0ec 4816#endif
ed318a6c 4817 fscrypt_free_dummy_context(&sbi->s_dummy_enc_ctx);
617ba13b 4818 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4819 brelse(bh);
4820out_fail:
4821 sb->s_fs_info = NULL;
f6830165 4822 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4823out_free_base:
ac27a0ec 4824 kfree(sbi);
d4c402d9 4825 kfree(orig_data);
5e405595 4826 fs_put_dax(dax_dev);
07aa2ea1 4827 return err ? err : ret;
ac27a0ec
DK		 4828}
4829
4830/*
4831 * Setup any per-fs journal parameters now. We'll do this both on
4832 * initial mount, once the journal has been initialised but before we've
4833 * done any recovery; and again on any subsequent remount.
4834 */
617ba13b 4835static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4836{
617ba13b 4837 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4838
30773840
TT		 4839 journal->j_commit_interval = sbi->s_commit_interval;
4840 journal->j_min_batch_time = sbi->s_min_batch_time;
4841 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4842
a931da6a 4843 write_lock(&journal->j_state_lock);
ac27a0ec 4844 if (test_opt(sb, BARRIER))
dab291af 4845 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4846 else
dab291af 4847 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4848 if (test_opt(sb, DATA_ERR_ABORT))
4849 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4850 else
4851 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4852 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4853}
4854
c6cb7e77
EW		 4855static struct inode *ext4_get_journal_inode(struct super_block *sb,
4856 unsigned int journal_inum)
ac27a0ec
DK		 4857{
4858 struct inode *journal_inode;
ac27a0ec 4859
c6cb7e77
EW		 4860 /*
4861 * Test for the existence of a valid inode on disk. Bad things
4862 * happen if we iget() an unused inode, as the subsequent iput()
4863 * will try to delete it.
4864 */
8a363970 4865 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 4866 if (IS_ERR(journal_inode)) {
b31e1552 4867 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4868 return NULL;
4869 }
4870 if (!journal_inode->i_nlink) {
4871 make_bad_inode(journal_inode);
4872 iput(journal_inode);
b31e1552 4873 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4874 return NULL;
4875 }
4876
e5f8eab8 4877 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4878 journal_inode, journal_inode->i_size);
1d1fe1ee 4879 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4880 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4881 iput(journal_inode);
4882 return NULL;
4883 }
c6cb7e77
EW		 4884 return journal_inode;
4885}
4886
4887static journal_t *ext4_get_journal(struct super_block *sb,
4888 unsigned int journal_inum)
4889{
4890 struct inode *journal_inode;
4891 journal_t *journal;
4892
4893 BUG_ON(!ext4_has_feature_journal(sb));
4894
4895 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4896 if (!journal_inode)
4897 return NULL;
ac27a0ec 4898
dab291af 4899 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4900 if (!journal) {
b31e1552 4901 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4902 iput(journal_inode);
4903 return NULL;
4904 }
4905 journal->j_private = sb;
617ba13b 4906 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4907 return journal;
4908}
4909
617ba13b 4910static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4911 dev_t j_dev)
4912{
2b2d6d01 4913 struct buffer_head *bh;
ac27a0ec 4914 journal_t *journal;
617ba13b
MC		 4915 ext4_fsblk_t start;
4916 ext4_fsblk_t len;
ac27a0ec 4917 int hblock, blocksize;
617ba13b 4918 ext4_fsblk_t sb_block;
ac27a0ec 4919 unsigned long offset;
2b2d6d01 4920 struct ext4_super_block *es;
ac27a0ec
DK		 4921 struct block_device *bdev;
4922
e2b911c5 4923 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4924
b31e1552 4925 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4926 if (bdev == NULL)
4927 return NULL;
4928
ac27a0ec 4929 blocksize = sb->s_blocksize;
e1defc4f 4930 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4931 if (blocksize < hblock) {
b31e1552
ES		 4932 ext4_msg(sb, KERN_ERR,
4933 "blocksize too small for journal device");
ac27a0ec
DK		 4934 goto out_bdev;
4935 }
4936
617ba13b
MC		 4937 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4938 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4939 set_blocksize(bdev, blocksize);
4940 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4941 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4942 "external journal");
ac27a0ec
DK		 4943 goto out_bdev;
4944 }
4945
2716b802 4946 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4947 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4948 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4949 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4950 ext4_msg(sb, KERN_ERR, "external journal has "
4951 "bad superblock");
ac27a0ec
DK		 4952 brelse(bh);
4953 goto out_bdev;
4954 }
4955
df4763be
DW		 4956 if ((le32_to_cpu(es->s_feature_ro_compat) &
4957 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4958 es->s_checksum != ext4_superblock_csum(sb, es)) {
4959 ext4_msg(sb, KERN_ERR, "external journal has "
4960 "corrupt superblock");
4961 brelse(bh);
4962 goto out_bdev;
4963 }
4964
617ba13b 4965 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4966 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4967 brelse(bh);
4968 goto out_bdev;
4969 }
4970
bd81d8ee 4971 len = ext4_blocks_count(es);
ac27a0ec
DK		 4972 start = sb_block + 1;
4973 brelse(bh); /* we're done with the superblock */
4974
dab291af 4975 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4976 start, len, blocksize);
4977 if (!journal) {
b31e1552 4978 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4979 goto out_bdev;
4980 }
4981 journal->j_private = sb;
dfec8a14 4982 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4983 wait_on_buffer(journal->j_sb_buffer);
4984 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4985 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4986 goto out_journal;
4987 }
4988 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4989 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4990 "user (unsupported) - %d",
ac27a0ec
DK		 4991 be32_to_cpu(journal->j_superblock->s_nr_users));
4992 goto out_journal;
4993 }
617ba13b
MC		 4994 EXT4_SB(sb)->journal_bdev = bdev;
4995 ext4_init_journal_params(sb, journal);
ac27a0ec 4996 return journal;
0b8e58a1 4997
ac27a0ec 4998out_journal:
dab291af 4999 jbd2_journal_destroy(journal);
ac27a0ec 5000out_bdev:
617ba13b 5001 ext4_blkdev_put(bdev);
ac27a0ec
DK		 5002 return NULL;
5003}
5004
617ba13b
MC		 5005static int ext4_load_journal(struct super_block *sb,
5006 struct ext4_super_block *es,
ac27a0ec
DK		 5007 unsigned long journal_devnum)
5008{
5009 journal_t *journal;
5010 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5011 dev_t journal_dev;
5012 int err = 0;
5013 int really_read_only;
5014
e2b911c5 5015 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 5016
ac27a0ec
DK		 5017 if (journal_devnum &&
5018 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 5019 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5020 "numbers have changed");
ac27a0ec
DK		 5021 journal_dev = new_decode_dev(journal_devnum);
5022 } else
5023 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5024
5025 really_read_only = bdev_read_only(sb->s_bdev);
5026
5027 /*
5028 * Are we loading a blank journal or performing recovery after a
5029 * crash? For recovery, we need to check in advance whether we
5030 * can get read-write access to the device.
5031 */
e2b911c5 5032 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 5033 if (sb_rdonly(sb)) {
b31e1552
ES		 5034 ext4_msg(sb, KERN_INFO, "INFO: recovery "
5035 "required on readonly filesystem");
ac27a0ec 5036 if (really_read_only) {
b31e1552 5037 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 5038 "unavailable, cannot proceed "
5039 "(try mounting with noload)");
ac27a0ec
DK		 5040 return -EROFS;
5041 }
b31e1552
ES		 5042 ext4_msg(sb, KERN_INFO, "write access will "
5043 "be enabled during recovery");
ac27a0ec
DK		 5044 }
5045 }
5046
5047 if (journal_inum && journal_dev) {
b31e1552
ES		 5048 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
5049 "and inode journals!");
ac27a0ec
DK		 5050 return -EINVAL;
5051 }
5052
5053 if (journal_inum) {
617ba13b 5054 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 5055 return -EINVAL;
5056 } else {
617ba13b 5057 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 5058 return -EINVAL;
5059 }
5060
90576c0b 5061 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 5062 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 5063
e2b911c5 5064 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 5065 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 5066 if (!err) {
5067 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
5068 if (save)
5069 memcpy(save, ((char *) es) +
5070 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 5071 err = jbd2_journal_load(journal);
1c13d5c0
TT		 5072 if (save)
5073 memcpy(((char *) es) + EXT4_S_ERR_START,
5074 save, EXT4_S_ERR_LEN);
5075 kfree(save);
5076 }
ac27a0ec
DK		 5077
5078 if (err) {
b31e1552 5079 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 5080 jbd2_journal_destroy(journal);
ac27a0ec
DK		 5081 return err;
5082 }
5083
617ba13b
MC		 5084 EXT4_SB(sb)->s_journal = journal;
5085 ext4_clear_journal_err(sb, es);
ac27a0ec 5086
c41303ce 5087 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 5088 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5089 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 5090
5091 /* Make sure we flush the recovery flag to disk. */
e2d67052 5092 ext4_commit_super(sb, 1);
ac27a0ec
DK		 5093 }
5094
5095 return 0;
5096}
5097
e2d67052 5098static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 5099{
e2d67052 5100 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 5101 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 5102 int error = 0;
ac27a0ec 5103
bdfe0cbd 5104 if (!sbh || block_device_ejected(sb))
c4be0c1d 5105 return error;
a17712c8
JD		 5106
5107 /*
5108 * The superblock bh should be mapped, but it might not be if the
5109 * device was hot-removed. Not much we can do but fail the I/O.
5110 */
5111 if (!buffer_mapped(sbh))
5112 return error;
5113
71290b36
TT		 5114 /*
5115 * If the file system is mounted read-only, don't update the
5116 * superblock write time. This avoids updating the superblock
5117 * write time when we are mounting the root file system
5118 * read/only but we need to replay the journal; at that point,
5119 * for people who are east of GMT and who make their clock
5120 * tick in localtime for Windows bug-for-bug compatibility,
5121 * the clock is set in the future, and this will cause e2fsck
5122 * to complain and force a full file system check.
5123 */
1751e8a6 5124 if (!(sb->s_flags & SB_RDONLY))
6a0678a7 5125 ext4_update_tstamp(es, s_wtime);
f613dfcb
TT		 5126 if (sb->s_bdev->bd_part)
5127 es->s_kbytes_written =
5128 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
dbae2c55
MC		 5129 ((part_stat_read(sb->s_bdev->bd_part,
5130 sectors[STAT_WRITE]) -
afc32f7e 5131 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 5132 else
5133 es->s_kbytes_written =
5134 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 5135 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5136 ext4_free_blocks_count_set(es,
57042651
TT		 5137 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5138 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 5139 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5140 es->s_free_inodes_count =
5141 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 5142 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 5143 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 5144 ext4_superblock_csum_set(sb);
1566a48a
TT		 5145 if (sync)
5146 lock_buffer(sbh);
e8680786 5147 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 5148 /*
5149 * Oh, dear. A previous attempt to write the
5150 * superblock failed. This could happen because the
5151 * USB device was yanked out. Or it could happen to
5152 * be a transient write error and maybe the block will
5153 * be remapped. Nothing we can do but to retry the
5154 * write and hope for the best.
5155 */
5156 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5157 "superblock detected");
5158 clear_buffer_write_io_error(sbh);
5159 set_buffer_uptodate(sbh);
5160 }
ac27a0ec 5161 mark_buffer_dirty(sbh);
914258bf 5162 if (sync) {
1566a48a 5163 unlock_buffer(sbh);
564bc402 5164 error = __sync_dirty_buffer(sbh,
00473374 5165 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c89128a0 5166 if (buffer_write_io_error(sbh)) {
b31e1552
ES		 5167 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5168 "superblock");
914258bf
TT		 5169 clear_buffer_write_io_error(sbh);
5170 set_buffer_uptodate(sbh);
5171 }
5172 }
c4be0c1d 5173 return error;
ac27a0ec
DK		 5174}
5175
ac27a0ec
DK		 5176/*
5177 * Have we just finished recovery? If so, and if we are mounting (or
5178 * remounting) the filesystem readonly, then we will end up with a
5179 * consistent fs on disk. Record that fact.
5180 */
2b2d6d01
TT		 5181static void ext4_mark_recovery_complete(struct super_block *sb,
5182 struct ext4_super_block *es)
ac27a0ec 5183{
617ba13b 5184 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 5185
e2b911c5 5186 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 5187 BUG_ON(journal != NULL);
5188 return;
5189 }
dab291af 5190 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 5191 if (jbd2_journal_flush(journal) < 0)
5192 goto out;
5193
bc98a42c 5194 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 5195 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 5196 ext4_commit_super(sb, 1);
ac27a0ec 5197 }
7ffe1ea8
HK		 5198
5199out:
dab291af 5200 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 5201}
5202
5203/*
5204 * If we are mounting (or read-write remounting) a filesystem whose journal
5205 * has recorded an error from a previous lifetime, move that error to the
5206 * main filesystem now.
5207 */
2b2d6d01
TT		 5208static void ext4_clear_journal_err(struct super_block *sb,
5209 struct ext4_super_block *es)
ac27a0ec
DK		 5210{
5211 journal_t *journal;
5212 int j_errno;
5213 const char *errstr;
5214
e2b911c5 5215 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 5216
617ba13b 5217 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 5218
5219 /*
5220 * Now check for any error status which may have been recorded in the
617ba13b 5221 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 5222 */
5223
dab291af 5224 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 5225 if (j_errno) {
5226 char nbuf[16];
5227
617ba13b 5228 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 5229 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 5230 "from previous mount: %s", errstr);
12062ddd 5231 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 5232
617ba13b
MC		 5233 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5234 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 5235 ext4_commit_super(sb, 1);
ac27a0ec 5236
dab291af 5237 jbd2_journal_clear_err(journal);
d796c52e 5238 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 5239 }
5240}
5241
5242/*
5243 * Force the running and committing transactions to commit,
5244 * and wait on the commit.
5245 */
617ba13b 5246int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 5247{
5248 journal_t *journal;
ac27a0ec 5249
bc98a42c 5250 if (sb_rdonly(sb))
ac27a0ec
DK		 5251 return 0;
5252
617ba13b 5253 journal = EXT4_SB(sb)->s_journal;
b1deefc9 5254 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 5255}
5256
617ba13b 5257static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 5258{
14ce0cb4 5259 int ret = 0;
9eddacf9 5260 tid_t target;
06a407f1 5261 bool needs_barrier = false;
8d5d02e6 5262 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5263
49598e04 5264 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 5265 return 0;
5266
9bffad1e 5267 trace_ext4_sync_fs(sb, wait);
2e8fa54e 5268 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 5269 /*
5270 * Writeback quota in non-journalled quota case - journalled quota has
5271 * no dirty dquots
5272 */
5273 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 5274 /*
5275 * Data writeback is possible w/o journal transaction, so barrier must
5276 * being sent at the end of the function. But we can skip it if
5277 * transaction_commit will do it for us.
5278 */
bda32530
TT		 5279 if (sbi->s_journal) {
5280 target = jbd2_get_latest_transaction(sbi->s_journal);
5281 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5282 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5283 needs_barrier = true;
5284
5285 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5286 if (wait)
5287 ret = jbd2_log_wait_commit(sbi->s_journal,
5288 target);
5289 }
5290 } else if (wait && test_opt(sb, BARRIER))
06a407f1 5291 needs_barrier = true;
06a407f1
DM		 5292 if (needs_barrier) {
5293 int err;
9398554f 5294 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL);
06a407f1
DM		 5295 if (!ret)
5296 ret = err;
0390131b 5297 }
06a407f1
DM		 5298
5299 return ret;
5300}
5301
ac27a0ec
DK		 5302/*
5303 * LVM calls this function before a (read-only) snapshot is created. This
5304 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 5305 *
5306 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 5307 * state independently. It relies on upper layer to stop all data & metadata
5308 * modifications.
ac27a0ec 5309 */
c4be0c1d 5310static int ext4_freeze(struct super_block *sb)
ac27a0ec 5311{
c4be0c1d
TS		 5312 int error = 0;
5313 journal_t *journal;
ac27a0ec 5314
bc98a42c 5315 if (sb_rdonly(sb))
9ca92389 5316 return 0;
ac27a0ec 5317
9ca92389 5318 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 5319
bb044576
TT		 5320 if (journal) {
5321 /* Now we set up the journal barrier. */
5322 jbd2_journal_lock_updates(journal);
ac27a0ec 5323
bb044576
TT		 5324 /*
5325 * Don't clear the needs_recovery flag if we failed to
5326 * flush the journal.
5327 */
5328 error = jbd2_journal_flush(journal);
5329 if (error < 0)
5330 goto out;
c642dc9e
ES		 5331
5332 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 5333 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 5334 }
9ca92389 5335
9ca92389 5336 error = ext4_commit_super(sb, 1);
6b0310fb 5337out:
bb044576
TT		 5338 if (journal)
5339 /* we rely on upper layer to stop further updates */
5340 jbd2_journal_unlock_updates(journal);
6b0310fb 5341 return error;
ac27a0ec
DK		 5342}
5343
5344/*
5345 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5346 * flag here, even though the filesystem is not technically dirty yet.
5347 */
c4be0c1d 5348static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 5349{
bc98a42c 5350 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 5351 return 0;
5352
c642dc9e
ES		 5353 if (EXT4_SB(sb)->s_journal) {
5354 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 5355 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 5356 }
5357
9ca92389 5358 ext4_commit_super(sb, 1);
c4be0c1d 5359 return 0;
ac27a0ec
DK		 5360}
5361
673c6100
TT		 5362/*
5363 * Structure to save mount options for ext4_remount's benefit
5364 */
5365struct ext4_mount_options {
5366 unsigned long s_mount_opt;
a2595b8a 5367 unsigned long s_mount_opt2;
08cefc7a
EB		 5368 kuid_t s_resuid;
5369 kgid_t s_resgid;
673c6100
TT		 5370 unsigned long s_commit_interval;
5371 u32 s_min_batch_time, s_max_batch_time;
5372#ifdef CONFIG_QUOTA
5373 int s_jquota_fmt;
a2d4a646 5374 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 5375#endif
5376};
5377
2b2d6d01 5378static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5379{
2b2d6d01 5380 struct ext4_super_block *es;
617ba13b 5381 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5382 unsigned long old_sb_flags;
617ba13b 5383 struct ext4_mount_options old_opts;
c79d967d 5384 int enable_quota = 0;
8a266467 5385 ext4_group_t g;
b3881f74 5386 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5387 int err = 0;
ac27a0ec 5388#ifdef CONFIG_QUOTA
03dafb5f 5389 int i, j;
33458eab 5390 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec 5391#endif
d4c402d9 5392 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec 5393
21ac738e
CX		 5394 if (data && !orig_data)
5395 return -ENOMEM;
5396
ac27a0ec
DK		 5397 /* Store the original options */
5398 old_sb_flags = sb->s_flags;
5399 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5400 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5401 old_opts.s_resuid = sbi->s_resuid;
5402 old_opts.s_resgid = sbi->s_resgid;
5403 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5404 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5405 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5406#ifdef CONFIG_QUOTA
5407 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5408 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5409 if (sbi->s_qf_names[i]) {
33458eab
TT		 5410 char *qf_name = get_qf_name(sb, sbi, i);
5411
5412 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 5413 if (!old_opts.s_qf_names[i]) {
5414 for (j = 0; j < i; j++)
5415 kfree(old_opts.s_qf_names[j]);
3e36a163 5416 kfree(orig_data);
03dafb5f
CG		 5417 return -ENOMEM;
5418 }
5419 } else
5420 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5421#endif
b3881f74
TT		 5422 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5423 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5424
661aa520 5425 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5426 err = -EINVAL;
5427 goto restore_opts;
5428 }
5429
6b992ff2 5430 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5431 test_opt(sb, JOURNAL_CHECKSUM)) {
5432 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5433 "during remount not supported; ignoring");
5434 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5435 }
5436
6ae6514b
PS		 5437 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5438 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5439 ext4_msg(sb, KERN_ERR, "can't mount with "
5440 "both data=journal and delalloc");
5441 err = -EINVAL;
5442 goto restore_opts;
5443 }
5444 if (test_opt(sb, DIOREAD_NOLOCK)) {
5445 ext4_msg(sb, KERN_ERR, "can't mount with "
5446 "both data=journal and dioread_nolock");
5447 err = -EINVAL;
5448 goto restore_opts;
5449 }
923ae0ff
RZ		 5450 if (test_opt(sb, DAX)) {
5451 ext4_msg(sb, KERN_ERR, "can't mount with "
5452 "both data=journal and dax");
5453 err = -EINVAL;
5454 goto restore_opts;
5455 }
ab04df78
JK		 5456 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5457 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5458 ext4_msg(sb, KERN_ERR, "can't mount with "
5459 "journal_async_commit in data=ordered mode");
5460 err = -EINVAL;
5461 goto restore_opts;
5462 }
923ae0ff
RZ		 5463 }
5464
cdb7ee4c
TE		 5465 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5466 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5467 err = -EINVAL;
5468 goto restore_opts;
5469 }
5470
923ae0ff
RZ		 5471 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5472 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5473 "dax flag with busy inodes while remounting");
5474 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 5475 }
5476
4ab2f15b 5477 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
54d3adbc 5478 ext4_abort(sb, EXT4_ERR_ESHUTDOWN, "Abort forced by user");
ac27a0ec 5479
1751e8a6
LT		 5480 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5481 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5482
5483 es = sbi->s_es;
5484
b3881f74 5485 if (sbi->s_journal) {
0390131b 5486 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5487 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5488 }
ac27a0ec 5489
1751e8a6
LT		 5490 if (*flags & SB_LAZYTIME)
5491 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5492
1751e8a6 5493 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5494 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5495 err = -EROFS;
5496 goto restore_opts;
5497 }
5498
1751e8a6 5499 if (*flags & SB_RDONLY) {
38c03b34
TT		 5500 err = sync_filesystem(sb);
5501 if (err < 0)
5502 goto restore_opts;
0f0dd62f
CH		 5503 err = dquot_suspend(sb, -1);
5504 if (err < 0)
c79d967d 5505 goto restore_opts;
c79d967d 5506
ac27a0ec
DK		 5507 /*
5508 * First of all, the unconditional stuff we have to do
5509 * to disable replay of the journal when we next remount
5510 */
1751e8a6 5511 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5512
5513 /*
5514 * OK, test if we are remounting a valid rw partition
5515 * readonly, and if so set the rdonly flag and then
5516 * mark the partition as valid again.
5517 */
617ba13b
MC		 5518 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5519 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5520 es->s_state = cpu_to_le16(sbi->s_mount_state);
5521
a63c9eb2 5522 if (sbi->s_journal)
0390131b 5523 ext4_mark_recovery_complete(sb, es);
2dca60d9
TT		 5524 if (sbi->s_mmp_tsk)
5525 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5526 } else {
a13fb1a4 5527 /* Make sure we can mount this feature set readwrite */
e2b911c5 5528 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5529 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5530 err = -EROFS;
5531 goto restore_opts;
5532 }
8a266467
TT		 5533 /*
5534 * Make sure the group descriptor checksums
0b8e58a1 5535 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5536 */
5537 for (g = 0; g < sbi->s_groups_count; g++) {
5538 struct ext4_group_desc *gdp =
5539 ext4_get_group_desc(sb, g, NULL);
5540
feb0ab32 5541 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5542 ext4_msg(sb, KERN_ERR,
5543 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5544 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5545 le16_to_cpu(gdp->bg_checksum));
6a797d27 5546 err = -EFSBADCRC;
8a266467
TT		 5547 goto restore_opts;
5548 }
5549 }
5550
ead6596b
ES		 5551 /*
5552 * If we have an unprocessed orphan list hanging
5553 * around from a previously readonly bdev mount,
5554 * require a full umount/remount for now.
5555 */
5556 if (es->s_last_orphan) {
b31e1552 5557 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5558 "remount RDWR because of unprocessed "
5559 "orphan inode list. Please "
b31e1552 5560 "umount/remount instead");
ead6596b
ES		 5561 err = -EINVAL;
5562 goto restore_opts;
5563 }
5564
ac27a0ec
DK		 5565 /*
5566 * Mounting a RDONLY partition read-write, so reread
5567 * and store the current valid flag. (It may have
5568 * been changed by e2fsck since we originally mounted
5569 * the partition.)
5570 */
0390131b
FM		 5571 if (sbi->s_journal)
5572 ext4_clear_journal_err(sb, es);
ac27a0ec 5573 sbi->s_mount_state = le16_to_cpu(es->s_state);
c89128a0
JK		 5574
5575 err = ext4_setup_super(sb, es, 0);
5576 if (err)
5577 goto restore_opts;
5578
5579 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5580 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5581 if (ext4_multi_mount_protect(sb,
5582 le64_to_cpu(es->s_mmp_block))) {
5583 err = -EROFS;
5584 goto restore_opts;
5585 }
c79d967d 5586 enable_quota = 1;
ac27a0ec
DK		 5587 }
5588 }
bfff6873
LC		 5589
5590 /*
5591 * Reinitialize lazy itable initialization thread based on
5592 * current settings
5593 */
bc98a42c 5594 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5595 ext4_unregister_li_request(sb);
5596 else {
5597 ext4_group_t first_not_zeroed;
5598 first_not_zeroed = ext4_has_uninit_itable(sb);
5599 ext4_register_li_request(sb, first_not_zeroed);
5600 }
5601
6fd058f7 5602 ext4_setup_system_zone(sb);
c89128a0
JK		 5603 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5604 err = ext4_commit_super(sb, 1);
5605 if (err)
5606 goto restore_opts;
5607 }
0390131b 5608
ac27a0ec
DK		 5609#ifdef CONFIG_QUOTA
5610 /* Release old quota file names */
a2d4a646 5611 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5612 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5613 if (enable_quota) {
5614 if (sb_any_quota_suspended(sb))
5615 dquot_resume(sb, -1);
e2b911c5 5616 else if (ext4_has_feature_quota(sb)) {
7c319d32 5617 err = ext4_enable_quotas(sb);
07724f98 5618 if (err)
7c319d32 5619 goto restore_opts;
7c319d32
AK		 5620 }
5621 }
ac27a0ec 5622#endif
d4c402d9 5623
1751e8a6 5624 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5625 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5626 kfree(orig_data);
ac27a0ec 5627 return 0;
0b8e58a1 5628
ac27a0ec
DK		 5629restore_opts:
5630 sb->s_flags = old_sb_flags;
5631 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5632 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5633 sbi->s_resuid = old_opts.s_resuid;
5634 sbi->s_resgid = old_opts.s_resgid;
5635 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5636 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5637 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5638#ifdef CONFIG_QUOTA
5639 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5640 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
33458eab
TT		 5641 to_free[i] = get_qf_name(sb, sbi, i);
5642 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 5643 }
33458eab
TT		 5644 synchronize_rcu();
5645 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5646 kfree(to_free[i]);
ac27a0ec 5647#endif
d4c402d9 5648 kfree(orig_data);
ac27a0ec
DK		 5649 return err;
5650}
5651
689c958c
LX		 5652#ifdef CONFIG_QUOTA
5653static int ext4_statfs_project(struct super_block *sb,
5654 kprojid_t projid, struct kstatfs *buf)
5655{
5656 struct kqid qid;
5657 struct dquot *dquot;
5658 u64 limit;
5659 u64 curblock;
5660
5661 qid = make_kqid_projid(projid);
5662 dquot = dqget(sb, qid);
5663 if (IS_ERR(dquot))
5664 return PTR_ERR(dquot);
7b9ca4c6 5665 spin_lock(&dquot->dq_dqb_lock);
689c958c 5666
a08fe66e
CX		 5667 limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
5668 dquot->dq_dqb.dqb_bhardlimit);
57c32ea4
CX		 5669 limit >>= sb->s_blocksize_bits;
5670
689c958c 5671 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 5672 curblock = (dquot->dq_dqb.dqb_curspace +
5673 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 5674 buf->f_blocks = limit;
5675 buf->f_bfree = buf->f_bavail =
5676 (buf->f_blocks > curblock) ?
5677 (buf->f_blocks - curblock) : 0;
5678 }
5679
a08fe66e
CX		 5680 limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
5681 dquot->dq_dqb.dqb_ihardlimit);
689c958c
LX		 5682 if (limit && buf->f_files > limit) {
5683 buf->f_files = limit;
5684 buf->f_ffree =
5685 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5686 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5687 }
5688
7b9ca4c6 5689 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5690 dqput(dquot);
5691 return 0;
5692}
5693#endif
5694
2b2d6d01 5695static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5696{
5697 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5698 struct ext4_sb_info *sbi = EXT4_SB(sb);
5699 struct ext4_super_block *es = sbi->s_es;
27dd4385 5700 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5701 u64 fsid;
d02a9391 5702 s64 bfree;
27dd4385 5703 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5704
952fc18e
TT		 5705 if (!test_opt(sb, MINIX_DF))
5706 overhead = sbi->s_overhead;
ac27a0ec 5707
617ba13b 5708 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5709 buf->f_bsize = sb->s_blocksize;
b72f78cb 5710 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5711 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5712 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5713 /* prevent underflow in case that few free space is available */
57042651 5714 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5715 buf->f_bavail = buf->f_bfree -
5716 (ext4_r_blocks_count(es) + resv_blocks);
5717 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5718 buf->f_bavail = 0;
5719 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5720 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5721 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5722 fsid = le64_to_cpup((void *)es->s_uuid) ^
5723 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5724 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5725 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5726
689c958c
LX		 5727#ifdef CONFIG_QUOTA
5728 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5729 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5730 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5731#endif
ac27a0ec
DK		 5732 return 0;
5733}
5734
ac27a0ec
DK		 5735
5736#ifdef CONFIG_QUOTA
5737
bc8230ee
JK		 5738/*
5739 * Helper functions so that transaction is started before we acquire dqio_sem
5740 * to keep correct lock ordering of transaction > dqio_sem
5741 */
ac27a0ec
DK		 5742static inline struct inode *dquot_to_inode(struct dquot *dquot)
5743{
4c376dca 5744 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5745}
5746
617ba13b 5747static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5748{
5749 int ret, err;
5750 handle_t *handle;
5751 struct inode *inode;
5752
5753 inode = dquot_to_inode(dquot);
9924a92a 5754 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5755 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5756 if (IS_ERR(handle))
5757 return PTR_ERR(handle);
5758 ret = dquot_commit(dquot);
617ba13b 5759 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5760 if (!ret)
5761 ret = err;
5762 return ret;
5763}
5764
617ba13b 5765static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5766{
5767 int ret, err;
5768 handle_t *handle;
5769
9924a92a 5770 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5771 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5772 if (IS_ERR(handle))
5773 return PTR_ERR(handle);
5774 ret = dquot_acquire(dquot);
617ba13b 5775 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5776 if (!ret)
5777 ret = err;
5778 return ret;
5779}
5780
617ba13b 5781static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5782{
5783 int ret, err;
5784 handle_t *handle;
5785
9924a92a 5786 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5787 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5788 if (IS_ERR(handle)) {
5789 /* Release dquot anyway to avoid endless cycle in dqput() */
5790 dquot_release(dquot);
ac27a0ec 5791 return PTR_ERR(handle);
9c3013e9 5792 }
ac27a0ec 5793 ret = dquot_release(dquot);
617ba13b 5794 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5795 if (!ret)
5796 ret = err;
5797 return ret;
5798}
5799
617ba13b 5800static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5801{
262b4662
JK		 5802 struct super_block *sb = dquot->dq_sb;
5803 struct ext4_sb_info *sbi = EXT4_SB(sb);
5804
2c8be6b2 5805 /* Are we journaling quotas? */
e2b911c5 5806 if (ext4_has_feature_quota(sb) ||
262b4662 5807 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5808 dquot_mark_dquot_dirty(dquot);
617ba13b 5809 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5810 } else {
5811 return dquot_mark_dquot_dirty(dquot);
5812 }
5813}
5814
617ba13b 5815static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5816{
5817 int ret, err;
5818 handle_t *handle;
5819
5820 /* Data block + inode block */
2b0143b5 5821 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5822 if (IS_ERR(handle))
5823 return PTR_ERR(handle);
5824 ret = dquot_commit_info(sb, type);
617ba13b 5825 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5826 if (!ret)
5827 ret = err;
5828 return ret;
5829}
5830
5831/*
5832 * Turn on quotas during mount time - we need to find
5833 * the quota file and such...
5834 */
617ba13b 5835static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5836{
33458eab 5837 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
287a8095 5838 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5839}
5840
daf647d2
TT		 5841static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5842{
5843 struct ext4_inode_info *ei = EXT4_I(inode);
5844
5845 /* The first argument of lockdep_set_subclass has to be
5846 * *exactly* the same as the argument to init_rwsem() --- in
5847 * this case, in init_once() --- or lockdep gets unhappy
5848 * because the name of the lock is set using the
5849 * stringification of the argument to init_rwsem().
5850 */
5851 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5852 lockdep_set_subclass(&ei->i_data_sem, subclass);
5853}
5854
ac27a0ec
DK		 5855/*
5856 * Standard function to be called on quota_on
5857 */
617ba13b 5858static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5859 const struct path *path)
ac27a0ec
DK		 5860{
5861 int err;
ac27a0ec
DK		 5862
5863 if (!test_opt(sb, QUOTA))
5864 return -EINVAL;
0623543b 5865
ac27a0ec 5866 /* Quotafile not on the same filesystem? */
d8c9584e 5867 if (path->dentry->d_sb != sb)
ac27a0ec 5868 return -EXDEV;
0623543b
JK		 5869 /* Journaling quota? */
5870 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5871 /* Quotafile not in fs root? */
f00c9e44 5872 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5873 ext4_msg(sb, KERN_WARNING,
5874 "Quota file not on filesystem root. "
5875 "Journaled quota will not work");
91389240
JK		 5876 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5877 } else {
5878 /*
5879 * Clear the flag just in case mount options changed since
5880 * last time.
5881 */
5882 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 5883 }
0623543b
JK		 5884
5885 /*
5886 * When we journal data on quota file, we have to flush journal to see
5887 * all updates to the file when we bypass pagecache...
5888 */
0390131b 5889 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5890 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5891 /*
5892 * We don't need to lock updates but journal_flush() could
5893 * otherwise be livelocked...
5894 */
5895 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5896 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5897 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5898 if (err)
7ffe1ea8 5899 return err;
0623543b 5900 }
957153fc 5901
daf647d2
TT		 5902 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5903 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5904 if (err) {
daf647d2
TT		 5905 lockdep_set_quota_inode(path->dentry->d_inode,
5906 I_DATA_SEM_NORMAL);
957153fc
JK		 5907 } else {
5908 struct inode *inode = d_inode(path->dentry);
5909 handle_t *handle;
5910
61a92987
JK		 5911 /*
5912 * Set inode flags to prevent userspace from messing with quota
5913 * files. If this fails, we return success anyway since quotas
5914 * are already enabled and this is not a hard failure.
5915 */
957153fc
JK		 5916 inode_lock(inode);
5917 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5918 if (IS_ERR(handle))
5919 goto unlock_inode;
5920 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5921 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5922 S_NOATIME | S_IMMUTABLE);
4209ae12 5923 err = ext4_mark_inode_dirty(handle, inode);
957153fc
JK		 5924 ext4_journal_stop(handle);
5925 unlock_inode:
5926 inode_unlock(inode);
5927 }
daf647d2 5928 return err;
ac27a0ec
DK		 5929}
5930
7c319d32
AK		 5931static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5932 unsigned int flags)
5933{
5934 int err;
5935 struct inode *qf_inode;
a2d4a646 5936 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5937 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5938 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5939 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5940 };
5941
e2b911c5 5942 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5943
5944 if (!qf_inums[type])
5945 return -EPERM;
5946
8a363970 5947 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32
AK		 5948 if (IS_ERR(qf_inode)) {
5949 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5950 return PTR_ERR(qf_inode);
5951 }
5952
bcb13850
JK		 5953 /* Don't account quota for quota files to avoid recursion */
5954 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5955 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7212b95e 5956 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
daf647d2
TT		 5957 if (err)
5958 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
61157b24 5959 iput(qf_inode);
7c319d32
AK		 5960
5961 return err;
5962}
5963
5964/* Enable usage tracking for all quota types. */
5965static int ext4_enable_quotas(struct super_block *sb)
5966{
5967 int type, err = 0;
a2d4a646 5968 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5969 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5970 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5971 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5972 };
49da9392
JK		 5973 bool quota_mopt[EXT4_MAXQUOTAS] = {
5974 test_opt(sb, USRQUOTA),
5975 test_opt(sb, GRPQUOTA),
5976 test_opt(sb, PRJQUOTA),
5977 };
7c319d32 5978
91389240 5979 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 5980 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5981 if (qf_inums[type]) {
5982 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5983 DQUOT_USAGE_ENABLED |
5984 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 5985 if (err) {
5986 ext4_warning(sb,
72ba7450
TT		 5987 "Failed to enable quota tracking "
5988 "(type=%d, err=%d). Please run "
5989 "e2fsck to fix.", type, err);
7f144fd0
JU		 5990 for (type--; type >= 0; type--)
5991 dquot_quota_off(sb, type);
5992
7c319d32
AK		 5993 return err;
5994 }
5995 }
5996 }
5997 return 0;
5998}
5999
ca0e05e4
DM		 6000static int ext4_quota_off(struct super_block *sb, int type)
6001{
21f97697
JK		 6002 struct inode *inode = sb_dqopt(sb)->files[type];
6003 handle_t *handle;
957153fc 6004 int err;
21f97697 6005
87009d86
DM		 6006 /* Force all delayed allocation blocks to be allocated.
6007 * Caller already holds s_umount sem */
6008 if (test_opt(sb, DELALLOC))
ca0e05e4 6009 sync_filesystem(sb);
ca0e05e4 6010
957153fc 6011 if (!inode || !igrab(inode))
0b268590
AG		 6012 goto out;
6013
957153fc 6014 err = dquot_quota_off(sb, type);
964edf66 6015 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 6016 goto out_put;
6017
6018 inode_lock(inode);
61a92987
JK		 6019 /*
6020 * Update modification times of quota files when userspace can
6021 * start looking at them. If we fail, we return success anyway since
6022 * this is not a hard failure and quotas are already disabled.
6023 */
9924a92a 6024 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
4209ae12
HS		 6025 if (IS_ERR(handle)) {
6026 err = PTR_ERR(handle);
957153fc 6027 goto out_unlock;
4209ae12 6028 }
957153fc
JK		 6029 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
6030 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 6031 inode->i_mtime = inode->i_ctime = current_time(inode);
4209ae12 6032 err = ext4_mark_inode_dirty(handle, inode);
21f97697 6033 ext4_journal_stop(handle);
957153fc
JK		 6034out_unlock:
6035 inode_unlock(inode);
6036out_put:
964edf66 6037 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 6038 iput(inode);
6039 return err;
21f97697 6040out:
ca0e05e4
DM		 6041 return dquot_quota_off(sb, type);
6042}
6043
ac27a0ec
DK		 6044/* Read data from quotafile - avoid pagecache and such because we cannot afford
6045 * acquiring the locks... As quota files are never truncated and quota code
25985edc 6046 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 6047 * we don't have to be afraid of races */
617ba13b 6048static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 6049 size_t len, loff_t off)
6050{
6051 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 6052 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 6053 int offset = off & (sb->s_blocksize - 1);
6054 int tocopy;
6055 size_t toread;
6056 struct buffer_head *bh;
6057 loff_t i_size = i_size_read(inode);
6058
6059 if (off > i_size)
6060 return 0;
6061 if (off+len > i_size)
6062 len = i_size-off;
6063 toread = len;
6064 while (toread > 0) {
6065 tocopy = sb->s_blocksize - offset < toread ?
6066 sb->s_blocksize - offset : toread;
1c215028
TT		 6067 bh = ext4_bread(NULL, inode, blk, 0);
6068 if (IS_ERR(bh))
6069 return PTR_ERR(bh);
ac27a0ec
DK		 6070 if (!bh) /* A hole? */
6071 memset(data, 0, tocopy);
6072 else
6073 memcpy(data, bh->b_data+offset, tocopy);
6074 brelse(bh);
6075 offset = 0;
6076 toread -= tocopy;
6077 data += tocopy;
6078 blk++;
6079 }
6080 return len;
6081}
6082
6083/* Write to quotafile (we know the transaction is already started and has
6084 * enough credits) */
617ba13b 6085static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 6086 const char *data, size_t len, loff_t off)
6087{
6088 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 6089 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4209ae12 6090 int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
c5e298ae 6091 int retries = 0;
ac27a0ec
DK		 6092 struct buffer_head *bh;
6093 handle_t *handle = journal_current_handle();
6094
0390131b 6095 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 6096 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6097 " cancelled because transaction is not started",
9c3013e9
JK		 6098 (unsigned long long)off, (unsigned long long)len);
6099 return -EIO;
6100 }
67eeb568
DM		 6101 /*
6102 * Since we account only one data block in transaction credits,
6103 * then it is impossible to cross a block boundary.
6104 */
6105 if (sb->s_blocksize - offset < len) {
6106 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6107 " cancelled because not block aligned",
6108 (unsigned long long)off, (unsigned long long)len);
6109 return -EIO;
6110 }
6111
c5e298ae
TT		 6112 do {
6113 bh = ext4_bread(handle, inode, blk,
6114 EXT4_GET_BLOCKS_CREATE |
6115 EXT4_GET_BLOCKS_METADATA_NOFAIL);
45586c70 6116 } while (PTR_ERR(bh) == -ENOSPC &&
c5e298ae 6117 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 6118 if (IS_ERR(bh))
6119 return PTR_ERR(bh);
67eeb568
DM		 6120 if (!bh)
6121 goto out;
5d601255 6122 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 6123 err = ext4_journal_get_write_access(handle, bh);
6124 if (err) {
6125 brelse(bh);
1c215028 6126 return err;
ac27a0ec 6127 }
67eeb568
DM		 6128 lock_buffer(bh);
6129 memcpy(bh->b_data+offset, data, len);
6130 flush_dcache_page(bh->b_page);
6131 unlock_buffer(bh);
62d2b5f2 6132 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 6133 brelse(bh);
ac27a0ec 6134out:
67eeb568
DM		 6135 if (inode->i_size < off + len) {
6136 i_size_write(inode, off + len);
617ba13b 6137 EXT4_I(inode)->i_disksize = inode->i_size;
4209ae12
HS		 6138 err2 = ext4_mark_inode_dirty(handle, inode);
6139 if (unlikely(err2 && !err))
6140 err = err2;
ac27a0ec 6141 }
4209ae12 6142 return err ? err : len;
ac27a0ec 6143}
ac27a0ec
DK		 6144#endif
6145
152a0836
AV		 6146static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6147 const char *dev_name, void *data)
ac27a0ec 6148{
152a0836 6149 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 6150}
6151
c290ea01 6152#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 6153static inline void register_as_ext2(void)
6154{
6155 int err = register_filesystem(&ext2_fs_type);
6156 if (err)
6157 printk(KERN_WARNING
6158 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6159}
6160
6161static inline void unregister_as_ext2(void)
6162{
6163 unregister_filesystem(&ext2_fs_type);
6164}
2035e776
TT		 6165
6166static inline int ext2_feature_set_ok(struct super_block *sb)
6167{
e2b911c5 6168 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 6169 return 0;
bc98a42c 6170 if (sb_rdonly(sb))
2035e776 6171 return 1;
e2b911c5 6172 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 6173 return 0;
6174 return 1;
6175}
24b58424
TT		 6176#else
6177static inline void register_as_ext2(void) { }
6178static inline void unregister_as_ext2(void) { }
2035e776 6179static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 6180#endif
6181
24b58424
TT		 6182static inline void register_as_ext3(void)
6183{
6184 int err = register_filesystem(&ext3_fs_type);
6185 if (err)
6186 printk(KERN_WARNING
6187 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6188}
6189
6190static inline void unregister_as_ext3(void)
6191{
6192 unregister_filesystem(&ext3_fs_type);
6193}
2035e776
TT		 6194
6195static inline int ext3_feature_set_ok(struct super_block *sb)
6196{
e2b911c5 6197 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 6198 return 0;
e2b911c5 6199 if (!ext4_has_feature_journal(sb))
2035e776 6200 return 0;
bc98a42c 6201 if (sb_rdonly(sb))
2035e776 6202 return 1;
e2b911c5 6203 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 6204 return 0;
6205 return 1;
6206}
24b58424 6207
03010a33
TT		 6208static struct file_system_type ext4_fs_type = {
6209 .owner = THIS_MODULE,
6210 .name = "ext4",
152a0836 6211 .mount = ext4_mount,
03010a33
TT		 6212 .kill_sb = kill_block_super,
6213 .fs_flags = FS_REQUIRES_DEV,
6214};
7f78e035 6215MODULE_ALIAS_FS("ext4");
03010a33 6216
e9e3bcec
ES		 6217/* Shared across all ext4 file systems */
6218wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 6219
5dabfc78 6220static int __init ext4_init_fs(void)
ac27a0ec 6221{
e9e3bcec 6222 int i, err;
c9de560d 6223
e294a537 6224 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 6225 ext4_li_info = NULL;
6226 mutex_init(&ext4_li_mtx);
6227
9a4c8019 6228 /* Build-time check for flags consistency */
12e9b892 6229 ext4_check_flag_values();
e9e3bcec 6230
e142d052 6231 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 6232 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 6233
51865fda 6234 err = ext4_init_es();
6fd058f7
TT		 6235 if (err)
6236 return err;
51865fda 6237
1dc0aa46 6238 err = ext4_init_pending();
22cfe4b4
EB		 6239 if (err)
6240 goto out7;
6241
6242 err = ext4_init_post_read_processing();
1dc0aa46
EW		 6243 if (err)
6244 goto out6;
6245
51865fda
ZL		 6246 err = ext4_init_pageio();
6247 if (err)
b5799018 6248 goto out5;
51865fda 6249
5dabfc78 6250 err = ext4_init_system_zone();
bd2d0210 6251 if (err)
b5799018 6252 goto out4;
857ac889 6253
b5799018 6254 err = ext4_init_sysfs();
dd68314c 6255 if (err)
b5799018 6256 goto out3;
857ac889 6257
5dabfc78 6258 err = ext4_init_mballoc();
c9de560d
AT		 6259 if (err)
6260 goto out2;
ac27a0ec
DK		 6261 err = init_inodecache();
6262 if (err)
6263 goto out1;
24b58424 6264 register_as_ext3();
2035e776 6265 register_as_ext2();
03010a33 6266 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 6267 if (err)
6268 goto out;
bfff6873 6269
ac27a0ec
DK		 6270 return 0;
6271out:
24b58424
TT		 6272 unregister_as_ext2();
6273 unregister_as_ext3();
ac27a0ec
DK		 6274 destroy_inodecache();
6275out1:
5dabfc78 6276 ext4_exit_mballoc();
9c191f70 6277out2:
b5799018
TT		 6278 ext4_exit_sysfs();
6279out3:
5dabfc78 6280 ext4_exit_system_zone();
b5799018 6281out4:
5dabfc78 6282 ext4_exit_pageio();
b5799018 6283out5:
22cfe4b4 6284 ext4_exit_post_read_processing();
1dc0aa46 6285out6:
22cfe4b4
EB		 6286 ext4_exit_pending();
6287out7:
51865fda
ZL		 6288 ext4_exit_es();
6289
ac27a0ec
DK		 6290 return err;
6291}
6292
5dabfc78 6293static void __exit ext4_exit_fs(void)
ac27a0ec 6294{
bfff6873 6295 ext4_destroy_lazyinit_thread();
24b58424
TT		 6296 unregister_as_ext2();
6297 unregister_as_ext3();
03010a33 6298 unregister_filesystem(&ext4_fs_type);
ac27a0ec 6299 destroy_inodecache();
5dabfc78 6300 ext4_exit_mballoc();
b5799018 6301 ext4_exit_sysfs();
5dabfc78
TT		 6302 ext4_exit_system_zone();
6303 ext4_exit_pageio();
22cfe4b4 6304 ext4_exit_post_read_processing();
dd12ed14 6305 ext4_exit_es();
1dc0aa46 6306 ext4_exit_pending();
ac27a0ec
DK		 6307}
6308
6309MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 6310MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 6311MODULE_LICENSE("GPL");
7ef79ad5 6312MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 6313module_init(ext4_init_fs)
6314module_exit(ext4_exit_fs)
Linux 6.x block layer and io_uring tree(s)