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ext4: add cond_resched() to __ext4_find_entry()
[linux-2.6-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>
ac27a0ec 46
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:
96 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
97 * page lock -> i_data_sem (rw)
98 *
99 * buffered write path:
100 * sb_start_write -> i_mutex -> mmap_sem
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:
1d39834f
NB		 110 * sb_start_write -> i_mutex -> mmap_sem
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
1c13d5c0
TT		 338static void __save_error_info(struct super_block *sb, const char *func,
339 unsigned int line)
340{
341 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
342
343 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 344 if (bdev_read_only(sb->s_bdev))
345 return;
1c13d5c0 346 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6a0678a7 347 ext4_update_tstamp(es, s_last_error_time);
1c13d5c0
TT		 348 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
349 es->s_last_error_line = cpu_to_le32(line);
878520ac
TT		 350 if (es->s_last_error_errcode == 0)
351 es->s_last_error_errcode = EXT4_ERR_EFSCORRUPTED;
1c13d5c0
TT		 352 if (!es->s_first_error_time) {
353 es->s_first_error_time = es->s_last_error_time;
6a0678a7 354 es->s_first_error_time_hi = es->s_last_error_time_hi;
1c13d5c0
TT		 355 strncpy(es->s_first_error_func, func,
356 sizeof(es->s_first_error_func));
357 es->s_first_error_line = cpu_to_le32(line);
358 es->s_first_error_ino = es->s_last_error_ino;
359 es->s_first_error_block = es->s_last_error_block;
878520ac 360 es->s_first_error_errcode = es->s_last_error_errcode;
1c13d5c0 361 }
66e61a9e
TT		 362 /*
363 * Start the daily error reporting function if it hasn't been
364 * started already
365 */
366 if (!es->s_error_count)
367 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 368 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 369}
370
371static void save_error_info(struct super_block *sb, const char *func,
372 unsigned int line)
373{
374 __save_error_info(sb, func, line);
375 ext4_commit_super(sb, 1);
376}
377
bdfe0cbd
TT		 378/*
379 * The del_gendisk() function uninitializes the disk-specific data
380 * structures, including the bdi structure, without telling anyone
381 * else. Once this happens, any attempt to call mark_buffer_dirty()
382 * (for example, by ext4_commit_super), will cause a kernel OOPS.
383 * This is a kludge to prevent these oops until we can put in a proper
384 * hook in del_gendisk() to inform the VFS and file system layers.
385 */
386static int block_device_ejected(struct super_block *sb)
387{
388 struct inode *bd_inode = sb->s_bdev->bd_inode;
389 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
390
391 return bdi->dev == NULL;
392}
393
18aadd47
BJ		 394static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
395{
396 struct super_block *sb = journal->j_private;
397 struct ext4_sb_info *sbi = EXT4_SB(sb);
398 int error = is_journal_aborted(journal);
5d3ee208 399 struct ext4_journal_cb_entry *jce;
18aadd47 400
5d3ee208 401 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 402
403 ext4_process_freed_data(sb, txn->t_tid);
404
18aadd47 405 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 406 while (!list_empty(&txn->t_private_list)) {
407 jce = list_entry(txn->t_private_list.next,
408 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 409 list_del_init(&jce->jce_list);
410 spin_unlock(&sbi->s_md_lock);
411 jce->jce_func(sb, jce, error);
412 spin_lock(&sbi->s_md_lock);
413 }
414 spin_unlock(&sbi->s_md_lock);
415}
1c13d5c0 416
1dc1097f
JK		 417static bool system_going_down(void)
418{
419 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
420 || system_state == SYSTEM_RESTART;
421}
422
ac27a0ec
DK		 423/* Deal with the reporting of failure conditions on a filesystem such as
424 * inconsistencies detected or read IO failures.
425 *
426 * On ext2, we can store the error state of the filesystem in the
617ba13b 427 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 428 * write ordering constraints on the superblock which prevent us from
429 * writing it out straight away; and given that the journal is about to
430 * be aborted, we can't rely on the current, or future, transactions to
431 * write out the superblock safely.
432 *
dab291af 433 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 434 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 435 * that error until we've noted it down and cleared it.
436 */
437
617ba13b 438static void ext4_handle_error(struct super_block *sb)
ac27a0ec 439{
327eaf73
TT		 440 if (test_opt(sb, WARN_ON_ERROR))
441 WARN_ON_ONCE(1);
442
bc98a42c 443 if (sb_rdonly(sb))
ac27a0ec
DK		 444 return;
445
2b2d6d01 446 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 447 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 448
4ab2f15b 449 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 450 if (journal)
dab291af 451 jbd2_journal_abort(journal, -EIO);
ac27a0ec 452 }
1dc1097f
JK		 453 /*
454 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
455 * could panic during 'reboot -f' as the underlying device got already
456 * disabled.
457 */
458 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
b31e1552 459 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 460 /*
461 * Make sure updated value of ->s_mount_flags will be visible
462 * before ->s_flags update
463 */
464 smp_wmb();
1751e8a6 465 sb->s_flags |= SB_RDONLY;
1dc1097f 466 } else if (test_opt(sb, ERRORS_PANIC)) {
4327ba52
DJ		 467 if (EXT4_SB(sb)->s_journal &&
468 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
469 return;
617ba13b 470 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 471 sb->s_id);
4327ba52 472 }
ac27a0ec
DK		 473}
474
efbed4dc
TT		 475#define ext4_error_ratelimit(sb) \
476 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
477 "EXT4-fs error")
478
12062ddd 479void __ext4_error(struct super_block *sb, const char *function,
c398eda0 480 unsigned int line, const char *fmt, ...)
ac27a0ec 481{
0ff2ea7d 482 struct va_format vaf;
ac27a0ec
DK		 483 va_list args;
484
0db1ff22
TT		 485 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
486 return;
487
ccf0f32a 488 trace_ext4_error(sb, function, line);
efbed4dc
TT		 489 if (ext4_error_ratelimit(sb)) {
490 va_start(args, fmt);
491 vaf.fmt = fmt;
492 vaf.va = &args;
493 printk(KERN_CRIT
494 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
495 sb->s_id, function, line, current->comm, &vaf);
496 va_end(args);
497 }
f3fc0210 498 save_error_info(sb, function, line);
617ba13b 499 ext4_handle_error(sb);
ac27a0ec
DK		 500}
501
e7c96e8e
JP		 502void __ext4_error_inode(struct inode *inode, const char *function,
503 unsigned int line, ext4_fsblk_t block,
504 const char *fmt, ...)
273df556
FM		 505{
506 va_list args;
f7c21177 507 struct va_format vaf;
1c13d5c0 508 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 509
0db1ff22
TT		 510 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
511 return;
512
ccf0f32a 513 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 514 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
515 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 516 if (ext4_error_ratelimit(inode->i_sb)) {
517 va_start(args, fmt);
518 vaf.fmt = fmt;
519 vaf.va = &args;
520 if (block)
521 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
522 "inode #%lu: block %llu: comm %s: %pV\n",
523 inode->i_sb->s_id, function, line, inode->i_ino,
524 block, current->comm, &vaf);
525 else
526 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
527 "inode #%lu: comm %s: %pV\n",
528 inode->i_sb->s_id, function, line, inode->i_ino,
529 current->comm, &vaf);
530 va_end(args);
531 }
1c13d5c0 532 save_error_info(inode->i_sb, function, line);
273df556
FM		 533 ext4_handle_error(inode->i_sb);
534}
535
e7c96e8e
JP		 536void __ext4_error_file(struct file *file, const char *function,
537 unsigned int line, ext4_fsblk_t block,
538 const char *fmt, ...)
273df556
FM		 539{
540 va_list args;
f7c21177 541 struct va_format vaf;
1c13d5c0 542 struct ext4_super_block *es;
496ad9aa 543 struct inode *inode = file_inode(file);
273df556
FM		 544 char pathname[80], *path;
545
0db1ff22
TT		 546 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
547 return;
548
ccf0f32a 549 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 550 es = EXT4_SB(inode->i_sb)->s_es;
551 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 552 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 553 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 554 if (IS_ERR(path))
555 path = "(unknown)";
556 va_start(args, fmt);
557 vaf.fmt = fmt;
558 vaf.va = &args;
559 if (block)
560 printk(KERN_CRIT
561 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
562 "block %llu: comm %s: path %s: %pV\n",
563 inode->i_sb->s_id, function, line, inode->i_ino,
564 block, current->comm, path, &vaf);
565 else
566 printk(KERN_CRIT
567 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
568 "comm %s: path %s: %pV\n",
569 inode->i_sb->s_id, function, line, inode->i_ino,
570 current->comm, path, &vaf);
571 va_end(args);
572 }
1c13d5c0 573 save_error_info(inode->i_sb, function, line);
273df556
FM		 574 ext4_handle_error(inode->i_sb);
575}
576
722887dd
TT		 577const char *ext4_decode_error(struct super_block *sb, int errno,
578 char nbuf[16])
ac27a0ec
DK		 579{
580 char *errstr = NULL;
581
582 switch (errno) {
6a797d27
DW		 583 case -EFSCORRUPTED:
584 errstr = "Corrupt filesystem";
585 break;
586 case -EFSBADCRC:
587 errstr = "Filesystem failed CRC";
588 break;
ac27a0ec
DK		 589 case -EIO:
590 errstr = "IO failure";
591 break;
592 case -ENOMEM:
593 errstr = "Out of memory";
594 break;
595 case -EROFS:
78f1ddbb
TT		 596 if (!sb || (EXT4_SB(sb)->s_journal &&
597 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 598 errstr = "Journal has aborted";
599 else
600 errstr = "Readonly filesystem";
601 break;
602 default:
603 /* If the caller passed in an extra buffer for unknown
604 * errors, textualise them now. Else we just return
605 * NULL. */
606 if (nbuf) {
607 /* Check for truncated error codes... */
608 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
609 errstr = nbuf;
610 }
611 break;
612 }
613
614 return errstr;
615}
616
878520ac
TT		 617void ext4_set_errno(struct super_block *sb, int err)
618{
619 if (err < 0)
620 err = -err;
621
622 switch (err) {
623 case EIO:
624 err = EXT4_ERR_EIO;
625 break;
626 case ENOMEM:
627 err = EXT4_ERR_ENOMEM;
628 break;
629 case EFSBADCRC:
630 err = EXT4_ERR_EFSBADCRC;
631 break;
632 case EFSCORRUPTED:
633 err = EXT4_ERR_EFSCORRUPTED;
634 break;
635 case ENOSPC:
636 err = EXT4_ERR_ENOSPC;
637 break;
638 case ENOKEY:
639 err = EXT4_ERR_ENOKEY;
640 break;
641 case EROFS:
642 err = EXT4_ERR_EROFS;
643 break;
644 case EFBIG:
645 err = EXT4_ERR_EFBIG;
646 break;
647 case EEXIST:
648 err = EXT4_ERR_EEXIST;
649 break;
650 case ERANGE:
651 err = EXT4_ERR_ERANGE;
652 break;
653 case EOVERFLOW:
654 err = EXT4_ERR_EOVERFLOW;
655 break;
656 case EBUSY:
657 err = EXT4_ERR_EBUSY;
658 break;
659 case ENOTDIR:
660 err = EXT4_ERR_ENOTDIR;
661 break;
662 case ENOTEMPTY:
663 err = EXT4_ERR_ENOTEMPTY;
664 break;
665 case ESHUTDOWN:
666 err = EXT4_ERR_ESHUTDOWN;
667 break;
668 case EFAULT:
669 err = EXT4_ERR_EFAULT;
670 break;
671 default:
672 err = EXT4_ERR_UNKNOWN;
673 }
674 EXT4_SB(sb)->s_es->s_last_error_errcode = err;
675}
676
617ba13b 677/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 678 * automatically and invokes the appropriate error response. */
679
c398eda0
TT		 680void __ext4_std_error(struct super_block *sb, const char *function,
681 unsigned int line, int errno)
ac27a0ec
DK		 682{
683 char nbuf[16];
684 const char *errstr;
685
0db1ff22
TT		 686 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
687 return;
688
ac27a0ec
DK		 689 /* Special case: if the error is EROFS, and we're not already
690 * inside a transaction, then there's really no point in logging
691 * an error. */
bc98a42c 692 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 693 return;
694
efbed4dc
TT		 695 if (ext4_error_ratelimit(sb)) {
696 errstr = ext4_decode_error(sb, errno, nbuf);
697 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
698 sb->s_id, function, line, errstr);
699 }
ac27a0ec 700
878520ac 701 ext4_set_errno(sb, -errno);
efbed4dc 702 save_error_info(sb, function, line);
617ba13b 703 ext4_handle_error(sb);
ac27a0ec
DK		 704}
705
706/*
617ba13b 707 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 708 * abort function may be used to deal with unrecoverable failures such
709 * as journal IO errors or ENOMEM at a critical moment in log management.
710 *
711 * We unconditionally force the filesystem into an ABORT|READONLY state,
712 * unless the error response on the fs has been set to panic in which
713 * case we take the easy way out and panic immediately.
714 */
715
c67d859e 716void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 717 unsigned int line, const char *fmt, ...)
ac27a0ec 718{
651e1c3b 719 struct va_format vaf;
ac27a0ec
DK		 720 va_list args;
721
0db1ff22
TT		 722 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
723 return;
724
1c13d5c0 725 save_error_info(sb, function, line);
ac27a0ec 726 va_start(args, fmt);
651e1c3b
JP		 727 vaf.fmt = fmt;
728 vaf.va = &args;
729 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
730 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 731 va_end(args);
732
bc98a42c 733 if (sb_rdonly(sb) == 0) {
1c13d5c0 734 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 735 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 736 /*
737 * Make sure updated value of ->s_mount_flags will be visible
738 * before ->s_flags update
739 */
740 smp_wmb();
1751e8a6 741 sb->s_flags |= SB_RDONLY;
1c13d5c0
TT		 742 if (EXT4_SB(sb)->s_journal)
743 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
744 save_error_info(sb, function, line);
745 }
2c1d0e36 746 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
4327ba52
DJ		 747 if (EXT4_SB(sb)->s_journal &&
748 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
749 return;
617ba13b 750 panic("EXT4-fs panic from previous error\n");
4327ba52 751 }
ac27a0ec
DK		 752}
753
e7c96e8e
JP		 754void __ext4_msg(struct super_block *sb,
755 const char *prefix, const char *fmt, ...)
b31e1552 756{
0ff2ea7d 757 struct va_format vaf;
b31e1552
ES		 758 va_list args;
759
efbed4dc
TT		 760 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
761 return;
762
b31e1552 763 va_start(args, fmt);
0ff2ea7d
JP		 764 vaf.fmt = fmt;
765 vaf.va = &args;
766 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 767 va_end(args);
768}
769
b03a2f7e
AD		 770#define ext4_warning_ratelimit(sb) \
771 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
772 "EXT4-fs warning")
773
12062ddd 774void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 775 unsigned int line, const char *fmt, ...)
ac27a0ec 776{
0ff2ea7d 777 struct va_format vaf;
ac27a0ec
DK		 778 va_list args;
779
b03a2f7e 780 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 781 return;
782
ac27a0ec 783 va_start(args, fmt);
0ff2ea7d
JP		 784 vaf.fmt = fmt;
785 vaf.va = &args;
786 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
787 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 788 va_end(args);
789}
790
b03a2f7e
AD		 791void __ext4_warning_inode(const struct inode *inode, const char *function,
792 unsigned int line, const char *fmt, ...)
793{
794 struct va_format vaf;
795 va_list args;
796
797 if (!ext4_warning_ratelimit(inode->i_sb))
798 return;
799
800 va_start(args, fmt);
801 vaf.fmt = fmt;
802 vaf.va = &args;
803 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
804 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
805 function, line, inode->i_ino, current->comm, &vaf);
806 va_end(args);
807}
808
e29136f8
TT		 809void __ext4_grp_locked_error(const char *function, unsigned int line,
810 struct super_block *sb, ext4_group_t grp,
811 unsigned long ino, ext4_fsblk_t block,
812 const char *fmt, ...)
5d1b1b3f
AK		 813__releases(bitlock)
814__acquires(bitlock)
815{
0ff2ea7d 816 struct va_format vaf;
5d1b1b3f
AK		 817 va_list args;
818 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
819
0db1ff22
TT		 820 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
821 return;
822
ccf0f32a 823 trace_ext4_error(sb, function, line);
1c13d5c0
TT		 824 es->s_last_error_ino = cpu_to_le32(ino);
825 es->s_last_error_block = cpu_to_le64(block);
826 __save_error_info(sb, function, line);
0ff2ea7d 827
efbed4dc
TT		 828 if (ext4_error_ratelimit(sb)) {
829 va_start(args, fmt);
830 vaf.fmt = fmt;
831 vaf.va = &args;
832 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
833 sb->s_id, function, line, grp);
834 if (ino)
835 printk(KERN_CONT "inode %lu: ", ino);
836 if (block)
837 printk(KERN_CONT "block %llu:",
838 (unsigned long long) block);
839 printk(KERN_CONT "%pV\n", &vaf);
840 va_end(args);
841 }
5d1b1b3f 842
327eaf73
TT		 843 if (test_opt(sb, WARN_ON_ERROR))
844 WARN_ON_ONCE(1);
845
5d1b1b3f 846 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 847 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 848 return;
849 }
1c13d5c0 850
5d1b1b3f 851 ext4_unlock_group(sb, grp);
06f29cc8 852 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 853 ext4_handle_error(sb);
854 /*
855 * We only get here in the ERRORS_RO case; relocking the group
856 * may be dangerous, but nothing bad will happen since the
857 * filesystem will have already been marked read/only and the
858 * journal has been aborted. We return 1 as a hint to callers
859 * who might what to use the return value from
25985edc 860 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 861 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
862 * aggressively from the ext4 function in question, with a
863 * more appropriate error code.
864 */
865 ext4_lock_group(sb, grp);
866 return;
867}
868
db79e6d1
WS		 869void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
870 ext4_group_t group,
871 unsigned int flags)
872{
873 struct ext4_sb_info *sbi = EXT4_SB(sb);
874 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
875 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
9af0b3d1
WS		 876 int ret;
877
878 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
879 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
880 &grp->bb_state);
881 if (!ret)
882 percpu_counter_sub(&sbi->s_freeclusters_counter,
883 grp->bb_free);
db79e6d1
WS		 884 }
885
9af0b3d1
WS		 886 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
887 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
888 &grp->bb_state);
889 if (!ret && gdp) {
db79e6d1
WS		 890 int count;
891
892 count = ext4_free_inodes_count(sb, gdp);
893 percpu_counter_sub(&sbi->s_freeinodes_counter,
894 count);
895 }
db79e6d1
WS		 896 }
897}
898
617ba13b 899void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 900{
617ba13b 901 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 902
617ba13b 903 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 904 return;
905
12062ddd 906 ext4_warning(sb,
ac27a0ec
DK		 907 "updating to rev %d because of new feature flag, "
908 "running e2fsck is recommended",
617ba13b 909 EXT4_DYNAMIC_REV);
ac27a0ec 910
617ba13b
MC		 911 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
912 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
913 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 914 /* leave es->s_feature_*compat flags alone */
915 /* es->s_uuid will be set by e2fsck if empty */
916
917 /*
918 * The rest of the superblock fields should be zero, and if not it
919 * means they are likely already in use, so leave them alone. We
920 * can leave it up to e2fsck to clean up any inconsistencies there.
921 */
922}
923
924/*
925 * Open the external journal device
926 */
b31e1552 927static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 928{
929 struct block_device *bdev;
930 char b[BDEVNAME_SIZE];
931
d4d77629 932 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 933 if (IS_ERR(bdev))
934 goto fail;
935 return bdev;
936
937fail:
b31e1552 938 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 939 __bdevname(dev, b), PTR_ERR(bdev));
940 return NULL;
941}
942
943/*
944 * Release the journal device
945 */
4385bab1 946static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 947{
4385bab1 948 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 949}
950
4385bab1 951static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 952{
953 struct block_device *bdev;
ac27a0ec
DK		 954 bdev = sbi->journal_bdev;
955 if (bdev) {
4385bab1 956 ext4_blkdev_put(bdev);
ac27a0ec
DK		 957 sbi->journal_bdev = NULL;
958 }
ac27a0ec
DK		 959}
960
961static inline struct inode *orphan_list_entry(struct list_head *l)
962{
617ba13b 963 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 964}
965
617ba13b 966static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 967{
968 struct list_head *l;
969
b31e1552
ES		 970 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
971 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 972
973 printk(KERN_ERR "sb_info orphan list:\n");
974 list_for_each(l, &sbi->s_orphan) {
975 struct inode *inode = orphan_list_entry(l);
976 printk(KERN_ERR " "
977 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
978 inode->i_sb->s_id, inode->i_ino, inode,
979 inode->i_mode, inode->i_nlink,
980 NEXT_ORPHAN(inode));
981 }
982}
983
957153fc
JK		 984#ifdef CONFIG_QUOTA
985static int ext4_quota_off(struct super_block *sb, int type);
986
987static inline void ext4_quota_off_umount(struct super_block *sb)
988{
989 int type;
990
964edf66
JK		 991 /* Use our quota_off function to clear inode flags etc. */
992 for (type = 0; type < EXT4_MAXQUOTAS; type++)
993 ext4_quota_off(sb, type);
957153fc 994}
33458eab
TT		 995
996/*
997 * This is a helper function which is used in the mount/remount
998 * codepaths (which holds s_umount) to fetch the quota file name.
999 */
1000static inline char *get_qf_name(struct super_block *sb,
1001 struct ext4_sb_info *sbi,
1002 int type)
1003{
1004 return rcu_dereference_protected(sbi->s_qf_names[type],
1005 lockdep_is_held(&sb->s_umount));
1006}
957153fc
JK		 1007#else
1008static inline void ext4_quota_off_umount(struct super_block *sb)
1009{
1010}
1011#endif
1012
2b2d6d01 1013static void ext4_put_super(struct super_block *sb)
ac27a0ec 1014{
617ba13b
MC		 1015 struct ext4_sb_info *sbi = EXT4_SB(sb);
1016 struct ext4_super_block *es = sbi->s_es;
97abd7d4 1017 int aborted = 0;
ef2cabf7 1018 int i, err;
ac27a0ec 1019
857ac889 1020 ext4_unregister_li_request(sb);
957153fc 1021 ext4_quota_off_umount(sb);
e0ccfd95 1022
2e8fa54e 1023 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 1024
0390131b 1025 if (sbi->s_journal) {
97abd7d4 1026 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 1027 err = jbd2_journal_destroy(sbi->s_journal);
1028 sbi->s_journal = NULL;
878520ac
TT		 1029 if ((err < 0) && !aborted) {
1030 ext4_set_errno(sb, -err);
c67d859e 1031 ext4_abort(sb, "Couldn't clean up the journal");
878520ac 1032 }
0390131b 1033 }
d4edac31 1034
ebd173be 1035 ext4_unregister_sysfs(sb);
d3922a77 1036 ext4_es_unregister_shrinker(sbi);
9105bb14 1037 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 1038 ext4_release_system_zone(sb);
1039 ext4_mb_release(sb);
1040 ext4_ext_release(sb);
d4edac31 1041
bc98a42c 1042 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 1043 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 1044 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 1045 }
bc98a42c 1046 if (!sb_rdonly(sb))
a8e25a83
AB		 1047 ext4_commit_super(sb, 1);
1048
ac27a0ec
DK		 1049 for (i = 0; i < sbi->s_gdb_count; i++)
1050 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 1051 kvfree(sbi->s_group_desc);
1052 kvfree(sbi->s_flex_groups);
57042651 1053 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 1054 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1055 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 1056 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 1057 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 1058#ifdef CONFIG_QUOTA
a2d4a646 1059 for (i = 0; i < EXT4_MAXQUOTAS; i++)
33458eab 1060 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 1061#endif
1062
1063 /* Debugging code just in case the in-memory inode orphan list
1064 * isn't empty. The on-disk one can be non-empty if we've
1065 * detected an error and taken the fs readonly, but the
1066 * in-memory list had better be clean by this point. */
1067 if (!list_empty(&sbi->s_orphan))
1068 dump_orphan_list(sb, sbi);
1069 J_ASSERT(list_empty(&sbi->s_orphan));
1070
89d96a6f 1071 sync_blockdev(sb->s_bdev);
f98393a6 1072 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 1073 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1074 /*
1075 * Invalidate the journal device's buffers. We don't want them
1076 * floating about in memory - the physical journal device may
1077 * hotswapped, and it breaks the `ro-after' testing code.
1078 */
1079 sync_blockdev(sbi->journal_bdev);
f98393a6 1080 invalidate_bdev(sbi->journal_bdev);
617ba13b 1081 ext4_blkdev_remove(sbi);
ac27a0ec 1082 }
50c15df6
CX		 1083
1084 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1085 sbi->s_ea_inode_cache = NULL;
1086
1087 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1088 sbi->s_ea_block_cache = NULL;
1089
c5e06d10
JL		 1090 if (sbi->s_mmp_tsk)
1091 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 1092 brelse(sbi->s_sbh);
ac27a0ec 1093 sb->s_fs_info = NULL;
3197ebdb
TT		 1094 /*
1095 * Now that we are completely done shutting down the
1096 * superblock, we need to actually destroy the kobject.
1097 */
3197ebdb
TT		 1098 kobject_put(&sbi->s_kobj);
1099 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1100 if (sbi->s_chksum_driver)
1101 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1102 kfree(sbi->s_blockgroup_lock);
5e405595 1103 fs_put_dax(sbi->s_daxdev);
c83ad55e
GKB		 1104#ifdef CONFIG_UNICODE
1105 utf8_unload(sbi->s_encoding);
1106#endif
ac27a0ec 1107 kfree(sbi);
ac27a0ec
DK		 1108}
1109
e18b890b 1110static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1111
1112/*
1113 * Called inside transaction, so use GFP_NOFS
1114 */
617ba13b 1115static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1116{
617ba13b 1117 struct ext4_inode_info *ei;
ac27a0ec 1118
e6b4f8da 1119 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1120 if (!ei)
1121 return NULL;
0b8e58a1 1122
ee73f9a5 1123 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 1124 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 1125 INIT_LIST_HEAD(&ei->i_prealloc_list);
1126 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1127 ext4_es_init_tree(&ei->i_es_tree);
1128 rwlock_init(&ei->i_es_lock);
edaa53ca 1129 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1130 ei->i_es_all_nr = 0;
edaa53ca 1131 ei->i_es_shk_nr = 0;
dd475925 1132 ei->i_es_shrink_lblk = 0;
d2a17637 1133 ei->i_reserved_data_blocks = 0;
d2a17637 1134 spin_lock_init(&(ei->i_block_reservation_lock));
1dc0aa46 1135 ext4_init_pending_tree(&ei->i_pending_tree);
a9e7f447
DM		 1136#ifdef CONFIG_QUOTA
1137 ei->i_reserved_quota = 0;
96c7e0d9 1138 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1139#endif
8aefcd55 1140 ei->jinode = NULL;
2e8fa54e 1141 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1142 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1143 ei->i_sync_tid = 0;
1144 ei->i_datasync_tid = 0;
e27f41e1 1145 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1146 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 1147 return &ei->vfs_inode;
1148}
1149
7ff9c073
TT		 1150static int ext4_drop_inode(struct inode *inode)
1151{
1152 int drop = generic_drop_inode(inode);
1153
29b3692e
EB		 1154 if (!drop)
1155 drop = fscrypt_drop_inode(inode);
1156
7ff9c073
TT		 1157 trace_ext4_drop_inode(inode, drop);
1158 return drop;
1159}
1160
94053139 1161static void ext4_free_in_core_inode(struct inode *inode)
fa0d7e3d 1162{
2c58d548 1163 fscrypt_free_inode(inode);
fa0d7e3d
NP		 1164 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1165}
1166
617ba13b 1167static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1168{
9f7dd93d 1169 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1170 ext4_msg(inode->i_sb, KERN_ERR,
1171 "Inode %lu (%p): orphan list check failed!",
1172 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1173 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1174 EXT4_I(inode), sizeof(struct ext4_inode_info),
1175 true);
1176 dump_stack();
1177 }
ac27a0ec
DK		 1178}
1179
51cc5068 1180static void init_once(void *foo)
ac27a0ec 1181{
617ba13b 1182 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1183
a35afb83 1184 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1185 init_rwsem(&ei->xattr_sem);
0e855ac8 1186 init_rwsem(&ei->i_data_sem);
ea3d7209 1187 init_rwsem(&ei->i_mmap_sem);
a35afb83 1188 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1189}
1190
e67bc2b3 1191static int __init init_inodecache(void)
ac27a0ec 1192{
f8dd7c70
DW		 1193 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1194 sizeof(struct ext4_inode_info), 0,
1195 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1196 SLAB_ACCOUNT),
1197 offsetof(struct ext4_inode_info, i_data),
1198 sizeof_field(struct ext4_inode_info, i_data),
1199 init_once);
617ba13b 1200 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1201 return -ENOMEM;
1202 return 0;
1203}
1204
1205static void destroy_inodecache(void)
1206{
8c0a8537
KS		 1207 /*
1208 * Make sure all delayed rcu free inodes are flushed before we
1209 * destroy cache.
1210 */
1211 rcu_barrier();
617ba13b 1212 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1213}
1214
0930fcc1 1215void ext4_clear_inode(struct inode *inode)
ac27a0ec 1216{
0930fcc1 1217 invalidate_inode_buffers(inode);
dbd5768f 1218 clear_inode(inode);
c2ea3fde 1219 ext4_discard_preallocations(inode);
51865fda 1220 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
f4c2d372 1221 dquot_drop(inode);
8aefcd55
TT		 1222 if (EXT4_I(inode)->jinode) {
1223 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1224 EXT4_I(inode)->jinode);
1225 jbd2_free_inode(EXT4_I(inode)->jinode);
1226 EXT4_I(inode)->jinode = NULL;
1227 }
3d204e24 1228 fscrypt_put_encryption_info(inode);
c93d8f88 1229 fsverity_cleanup_inode(inode);
ac27a0ec
DK		 1230}
1231
1b961ac0 1232static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1233 u64 ino, u32 generation)
ac27a0ec 1234{
ac27a0ec 1235 struct inode *inode;
ac27a0ec 1236
8a363970 1237 /*
ac27a0ec
DK		 1238 * Currently we don't know the generation for parent directory, so
1239 * a generation of 0 means "accept any"
1240 */
8a363970 1241 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1242 if (IS_ERR(inode))
1243 return ERR_CAST(inode);
1244 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1245 iput(inode);
1246 return ERR_PTR(-ESTALE);
1247 }
1b961ac0
CH		 1248
1249 return inode;
1250}
1251
1252static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1253 int fh_len, int fh_type)
1b961ac0
CH		 1254{
1255 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1256 ext4_nfs_get_inode);
1257}
1258
1259static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1260 int fh_len, int fh_type)
1b961ac0
CH		 1261{
1262 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1263 ext4_nfs_get_inode);
ac27a0ec
DK		 1264}
1265
fde87268
TT		 1266static int ext4_nfs_commit_metadata(struct inode *inode)
1267{
1268 struct writeback_control wbc = {
1269 .sync_mode = WB_SYNC_ALL
1270 };
1271
1272 trace_ext4_nfs_commit_metadata(inode);
1273 return ext4_write_inode(inode, &wbc);
1274}
1275
c39a7f84
TO		 1276/*
1277 * Try to release metadata pages (indirect blocks, directories) which are
1278 * mapped via the block device. Since these pages could have journal heads
1279 * which would prevent try_to_free_buffers() from freeing them, we must use
1280 * jbd2 layer's try_to_free_buffers() function to release them.
1281 */
0b8e58a1
AD		 1282static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1283 gfp_t wait)
c39a7f84
TO		 1284{
1285 journal_t *journal = EXT4_SB(sb)->s_journal;
1286
1287 WARN_ON(PageChecked(page));
1288 if (!page_has_buffers(page))
1289 return 0;
1290 if (journal)
1291 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1292 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1293 return try_to_free_buffers(page);
1294}
1295
643fa961 1296#ifdef CONFIG_FS_ENCRYPTION
a7550b30
JK		 1297static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1298{
1299 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1300 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1301}
1302
a7550b30
JK		 1303static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1304 void *fs_data)
1305{
2f8f5e76 1306 handle_t *handle = fs_data;
c1a5d5f6 1307 int res, res2, credits, retries = 0;
2f8f5e76 1308
9ce0151a
EB		 1309 /*
1310 * Encrypting the root directory is not allowed because e2fsck expects
1311 * lost+found to exist and be unencrypted, and encrypting the root
1312 * directory would imply encrypting the lost+found directory as well as
1313 * the filename "lost+found" itself.
1314 */
1315 if (inode->i_ino == EXT4_ROOT_INO)
1316 return -EPERM;
2f8f5e76 1317
7d3e06a8
RZ		 1318 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1319 return -EINVAL;
1320
94840e3c
EB		 1321 res = ext4_convert_inline_data(inode);
1322 if (res)
1323 return res;
1324
2f8f5e76
EB		 1325 /*
1326 * If a journal handle was specified, then the encryption context is
1327 * being set on a new inode via inheritance and is part of a larger
1328 * transaction to create the inode. Otherwise the encryption context is
1329 * being set on an existing inode in its own transaction. Only in the
1330 * latter case should the "retry on ENOSPC" logic be used.
1331 */
a7550b30 1332
2f8f5e76
EB		 1333 if (handle) {
1334 res = ext4_xattr_set_handle(handle, inode,
1335 EXT4_XATTR_INDEX_ENCRYPTION,
1336 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1337 ctx, len, 0);
a7550b30
JK		 1338 if (!res) {
1339 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1340 ext4_clear_inode_state(inode,
1341 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1342 /*
2ee6a576
EB		 1343 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1344 * S_DAX may be disabled
a3caa24b
JK		 1345 */
1346 ext4_set_inode_flags(inode);
a7550b30
JK		 1347 }
1348 return res;
1349 }
1350
b8cb5a54
TE		 1351 res = dquot_initialize(inode);
1352 if (res)
1353 return res;
2f8f5e76 1354retry:
af65207c
TE		 1355 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1356 &credits);
dec214d0
TE		 1357 if (res)
1358 return res;
1359
c1a5d5f6 1360 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1361 if (IS_ERR(handle))
1362 return PTR_ERR(handle);
1363
2f8f5e76
EB		 1364 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1365 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1366 ctx, len, 0);
a7550b30
JK		 1367 if (!res) {
1368 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1369 /*
1370 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1371 * S_DAX may be disabled
1372 */
a3caa24b 1373 ext4_set_inode_flags(inode);
a7550b30
JK		 1374 res = ext4_mark_inode_dirty(handle, inode);
1375 if (res)
1376 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1377 }
1378 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1379
1380 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1381 goto retry;
a7550b30
JK		 1382 if (!res)
1383 res = res2;
1384 return res;
1385}
1386
c250b7dd 1387static bool ext4_dummy_context(struct inode *inode)
a7550b30
JK		 1388{
1389 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1390}
1391
b925acb8
EB		 1392static bool ext4_has_stable_inodes(struct super_block *sb)
1393{
1394 return ext4_has_feature_stable_inodes(sb);
1395}
1396
1397static void ext4_get_ino_and_lblk_bits(struct super_block *sb,
1398 int *ino_bits_ret, int *lblk_bits_ret)
1399{
1400 *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count);
1401 *lblk_bits_ret = 8 * sizeof(ext4_lblk_t);
1402}
1403
6f69f0ed 1404static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1405 .key_prefix = "ext4:",
a7550b30 1406 .get_context = ext4_get_context,
a7550b30
JK		 1407 .set_context = ext4_set_context,
1408 .dummy_context = ext4_dummy_context,
a7550b30 1409 .empty_dir = ext4_empty_dir,
e12ee683 1410 .max_namelen = EXT4_NAME_LEN,
b925acb8
EB		 1411 .has_stable_inodes = ext4_has_stable_inodes,
1412 .get_ino_and_lblk_bits = ext4_get_ino_and_lblk_bits,
a7550b30 1413};
a7550b30
JK		 1414#endif
1415
ac27a0ec 1416#ifdef CONFIG_QUOTA
d6006186 1417static const char * const quotatypes[] = INITQFNAMES;
689c958c 1418#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1419
617ba13b
MC		 1420static int ext4_write_dquot(struct dquot *dquot);
1421static int ext4_acquire_dquot(struct dquot *dquot);
1422static int ext4_release_dquot(struct dquot *dquot);
1423static int ext4_mark_dquot_dirty(struct dquot *dquot);
1424static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1425static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1426 const struct path *path);
617ba13b
MC		 1427static int ext4_quota_on_mount(struct super_block *sb, int type);
1428static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1429 size_t len, loff_t off);
617ba13b 1430static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1431 const char *data, size_t len, loff_t off);
7c319d32
AK		 1432static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1433 unsigned int flags);
1434static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1435
96c7e0d9
JK		 1436static struct dquot **ext4_get_dquots(struct inode *inode)
1437{
1438 return EXT4_I(inode)->i_dquot;
1439}
1440
61e225dc 1441static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1442 .get_reserved_space = ext4_get_reserved_space,
1443 .write_dquot = ext4_write_dquot,
1444 .acquire_dquot = ext4_acquire_dquot,
1445 .release_dquot = ext4_release_dquot,
1446 .mark_dirty = ext4_mark_dquot_dirty,
1447 .write_info = ext4_write_info,
1448 .alloc_dquot = dquot_alloc,
1449 .destroy_dquot = dquot_destroy,
1450 .get_projid = ext4_get_projid,
1451 .get_inode_usage = ext4_get_inode_usage,
ebc11f7b 1452 .get_next_id = dquot_get_next_id,
ac27a0ec
DK		 1453};
1454
0d54b217 1455static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1456 .quota_on = ext4_quota_on,
ca0e05e4 1457 .quota_off = ext4_quota_off,
287a8095 1458 .quota_sync = dquot_quota_sync,
0a240339 1459 .get_state = dquot_get_state,
287a8095
CH		 1460 .set_info = dquot_set_dqinfo,
1461 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1462 .set_dqblk = dquot_set_dqblk,
1463 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1464};
1465#endif
1466
ee9b6d61 1467static const struct super_operations ext4_sops = {
617ba13b 1468 .alloc_inode = ext4_alloc_inode,
94053139 1469 .free_inode = ext4_free_in_core_inode,
617ba13b 1470 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1471 .write_inode = ext4_write_inode,
1472 .dirty_inode = ext4_dirty_inode,
7ff9c073 1473 .drop_inode = ext4_drop_inode,
0930fcc1 1474 .evict_inode = ext4_evict_inode,
617ba13b 1475 .put_super = ext4_put_super,
617ba13b 1476 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1477 .freeze_fs = ext4_freeze,
1478 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1479 .statfs = ext4_statfs,
1480 .remount_fs = ext4_remount,
617ba13b 1481 .show_options = ext4_show_options,
ac27a0ec 1482#ifdef CONFIG_QUOTA
617ba13b
MC		 1483 .quota_read = ext4_quota_read,
1484 .quota_write = ext4_quota_write,
96c7e0d9 1485 .get_dquots = ext4_get_dquots,
ac27a0ec 1486#endif
c39a7f84 1487 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1488};
1489
39655164 1490static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1491 .fh_to_dentry = ext4_fh_to_dentry,
1492 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1493 .get_parent = ext4_get_parent,
fde87268 1494 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1495};
1496
1497enum {
1498 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1499 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1500 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1501 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1502 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1503 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1504 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1505 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1506 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1507 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1508 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1509 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1510 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
327eaf73
TT		 1511 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1512 Opt_nowarn_on_error, Opt_mblk_io_submit,
670e9875 1513 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1514 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1515 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1516 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1517 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1518 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
ac27a0ec
DK		 1519};
1520
a447c093 1521static const match_table_t tokens = {
ac27a0ec
DK		 1522 {Opt_bsd_df, "bsddf"},
1523 {Opt_minix_df, "minixdf"},
1524 {Opt_grpid, "grpid"},
1525 {Opt_grpid, "bsdgroups"},
1526 {Opt_nogrpid, "nogrpid"},
1527 {Opt_nogrpid, "sysvgroups"},
1528 {Opt_resgid, "resgid=%u"},
1529 {Opt_resuid, "resuid=%u"},
1530 {Opt_sb, "sb=%u"},
1531 {Opt_err_cont, "errors=continue"},
1532 {Opt_err_panic, "errors=panic"},
1533 {Opt_err_ro, "errors=remount-ro"},
1534 {Opt_nouid32, "nouid32"},
ac27a0ec 1535 {Opt_debug, "debug"},
72578c33
TT		 1536 {Opt_removed, "oldalloc"},
1537 {Opt_removed, "orlov"},
ac27a0ec
DK		 1538 {Opt_user_xattr, "user_xattr"},
1539 {Opt_nouser_xattr, "nouser_xattr"},
1540 {Opt_acl, "acl"},
1541 {Opt_noacl, "noacl"},
e3bb52ae 1542 {Opt_noload, "norecovery"},
5a916be1 1543 {Opt_noload, "noload"},
72578c33
TT		 1544 {Opt_removed, "nobh"},
1545 {Opt_removed, "bh"},
ac27a0ec 1546 {Opt_commit, "commit=%u"},
30773840
TT		 1547 {Opt_min_batch_time, "min_batch_time=%u"},
1548 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1549 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1550 {Opt_journal_path, "journal_path=%s"},
818d276c 1551 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1552 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1553 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1554 {Opt_abort, "abort"},
1555 {Opt_data_journal, "data=journal"},
1556 {Opt_data_ordered, "data=ordered"},
1557 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1558 {Opt_data_err_abort, "data_err=abort"},
1559 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1560 {Opt_offusrjquota, "usrjquota="},
1561 {Opt_usrjquota, "usrjquota=%s"},
1562 {Opt_offgrpjquota, "grpjquota="},
1563 {Opt_grpjquota, "grpjquota=%s"},
1564 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1565 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1566 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1567 {Opt_grpquota, "grpquota"},
1568 {Opt_noquota, "noquota"},
1569 {Opt_quota, "quota"},
1570 {Opt_usrquota, "usrquota"},
49da9392 1571 {Opt_prjquota, "prjquota"},
ac27a0ec 1572 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1573 {Opt_barrier, "barrier"},
1574 {Opt_nobarrier, "nobarrier"},
25ec56b5 1575 {Opt_i_version, "i_version"},
923ae0ff 1576 {Opt_dax, "dax"},
c9de560d 1577 {Opt_stripe, "stripe=%u"},
64769240 1578 {Opt_delalloc, "delalloc"},
327eaf73
TT		 1579 {Opt_warn_on_error, "warn_on_error"},
1580 {Opt_nowarn_on_error, "nowarn_on_error"},
a26f4992
TT		 1581 {Opt_lazytime, "lazytime"},
1582 {Opt_nolazytime, "nolazytime"},
670e9875 1583 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1584 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1585 {Opt_removed, "mblk_io_submit"},
1586 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1587 {Opt_block_validity, "block_validity"},
1588 {Opt_noblock_validity, "noblock_validity"},
240799cd 1589 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1590 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1591 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1592 {Opt_auto_da_alloc, "auto_da_alloc"},
1593 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc 1594 {Opt_dioread_nolock, "dioread_nolock"},
244adf64 1595 {Opt_dioread_lock, "nodioread_nolock"},
744692dc 1596 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1597 {Opt_discard, "discard"},
1598 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1599 {Opt_init_itable, "init_itable=%u"},
1600 {Opt_init_itable, "init_itable"},
1601 {Opt_noinit_itable, "noinit_itable"},
df981d03 1602 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1603 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1604 {Opt_nombcache, "nombcache"},
1605 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
c7198b9c
TT		 1606 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1607 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1608 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1609 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1610 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1611 {Opt_err, NULL},
ac27a0ec
DK		 1612};
1613
617ba13b 1614static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1615{
617ba13b 1616 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1617 char *options = (char *) *data;
1618
1619 if (!options || strncmp(options, "sb=", 3) != 0)
1620 return 1; /* Default location */
0b8e58a1 1621
ac27a0ec 1622 options += 3;
0b8e58a1 1623 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1624 sb_block = simple_strtoul(options, &options, 0);
1625 if (*options && *options != ',') {
4776004f 1626 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1627 (char *) *data);
1628 return 1;
1629 }
1630 if (*options == ',')
1631 options++;
1632 *data = (void *) options;
0b8e58a1 1633
ac27a0ec
DK		 1634 return sb_block;
1635}
1636
b3881f74 1637#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1638static const char deprecated_msg[] =
1639 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1640 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1641
56c50f11
DM		 1642#ifdef CONFIG_QUOTA
1643static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1644{
1645 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1646 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
03dafb5f 1647 int ret = -1;
56c50f11 1648
33458eab 1649 if (sb_any_quota_loaded(sb) && !old_qname) {
56c50f11
DM		 1650 ext4_msg(sb, KERN_ERR,
1651 "Cannot change journaled "
1652 "quota options when quota turned on");
57f73c2c 1653 return -1;
56c50f11 1654 }
e2b911c5 1655 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1656 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1657 "ignored when QUOTA feature is enabled");
1658 return 1;
262b4662 1659 }
56c50f11
DM		 1660 qname = match_strdup(args);
1661 if (!qname) {
1662 ext4_msg(sb, KERN_ERR,
1663 "Not enough memory for storing quotafile name");
57f73c2c 1664 return -1;
56c50f11 1665 }
33458eab
TT		 1666 if (old_qname) {
1667 if (strcmp(old_qname, qname) == 0)
03dafb5f
CG		 1668 ret = 1;
1669 else
1670 ext4_msg(sb, KERN_ERR,
1671 "%s quota file already specified",
1672 QTYPE2NAME(qtype));
1673 goto errout;
56c50f11 1674 }
03dafb5f 1675 if (strchr(qname, '/')) {
56c50f11
DM		 1676 ext4_msg(sb, KERN_ERR,
1677 "quotafile must be on filesystem root");
03dafb5f 1678 goto errout;
56c50f11 1679 }
33458eab 1680 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
fd8c37ec 1681 set_opt(sb, QUOTA);
56c50f11 1682 return 1;
03dafb5f
CG		 1683errout:
1684 kfree(qname);
1685 return ret;
56c50f11
DM		 1686}
1687
1688static int clear_qf_name(struct super_block *sb, int qtype)
1689{
1690
1691 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1692 char *old_qname = get_qf_name(sb, sbi, qtype);
56c50f11 1693
33458eab 1694 if (sb_any_quota_loaded(sb) && old_qname) {
56c50f11
DM		 1695 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1696 " when quota turned on");
57f73c2c 1697 return -1;
56c50f11 1698 }
33458eab
TT		 1699 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1700 synchronize_rcu();
1701 kfree(old_qname);
56c50f11
DM		 1702 return 1;
1703}
1704#endif
1705
26092bf5
TT		 1706#define MOPT_SET 0x0001
1707#define MOPT_CLEAR 0x0002
1708#define MOPT_NOSUPPORT 0x0004
1709#define MOPT_EXPLICIT 0x0008
1710#define MOPT_CLEAR_ERR 0x0010
1711#define MOPT_GTE0 0x0020
ac27a0ec 1712#ifdef CONFIG_QUOTA
26092bf5
TT		 1713#define MOPT_Q 0
1714#define MOPT_QFMT 0x0040
1715#else
1716#define MOPT_Q MOPT_NOSUPPORT
1717#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1718#endif
26092bf5 1719#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1720#define MOPT_NO_EXT2 0x0100
1721#define MOPT_NO_EXT3 0x0200
1722#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1723#define MOPT_STRING 0x0400
26092bf5
TT		 1724
1725static const struct mount_opts {
1726 int token;
1727 int mount_opt;
1728 int flags;
1729} ext4_mount_opts[] = {
1730 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1731 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1732 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1733 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1734 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1735 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1736 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1737 MOPT_EXT4_ONLY | MOPT_SET},
1738 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1739 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1740 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1741 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1742 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1743 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1744 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1745 MOPT_EXT4_ONLY | MOPT_CLEAR},
327eaf73
TT		 1746 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1747 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
c6d3d56d
DW		 1748 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1749 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1750 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1751 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1752 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1753 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1754 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1755 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1756 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1757 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1758 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1759 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1760 MOPT_NO_EXT2},
8dc0aa8c 1761 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1762 MOPT_NO_EXT2},
26092bf5
TT		 1763 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1764 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1765 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1766 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1767 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1768 {Opt_commit, 0, MOPT_GTE0},
1769 {Opt_max_batch_time, 0, MOPT_GTE0},
1770 {Opt_min_batch_time, 0, MOPT_GTE0},
1771 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1772 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1773 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1774 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1775 {Opt_resuid, 0, MOPT_GTE0},
1776 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1777 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1778 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1779 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1780 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1781 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1782 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1783 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1784 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1785 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1786#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1787 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1788 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1789#else
26092bf5
TT		 1790 {Opt_acl, 0, MOPT_NOSUPPORT},
1791 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1792#endif
26092bf5
TT		 1793 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1794 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1795 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1796 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1797 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1798 MOPT_SET | MOPT_Q},
1799 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1800 MOPT_SET | MOPT_Q},
49da9392
JK		 1801 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1802 MOPT_SET | MOPT_Q},
26092bf5 1803 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1804 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1805 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1806 {Opt_usrjquota, 0, MOPT_Q},
1807 {Opt_grpjquota, 0, MOPT_Q},
1808 {Opt_offusrjquota, 0, MOPT_Q},
1809 {Opt_offgrpjquota, 0, MOPT_Q},
1810 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1811 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1812 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1813 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1814 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
cdb7ee4c 1815 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
26092bf5
TT		 1816 {Opt_err, 0, 0}
1817};
1818
c83ad55e
GKB		 1819#ifdef CONFIG_UNICODE
1820static const struct ext4_sb_encodings {
1821 __u16 magic;
1822 char *name;
1823 char *version;
1824} ext4_sb_encoding_map[] = {
1825 {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1826};
1827
1828static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1829 const struct ext4_sb_encodings **encoding,
1830 __u16 *flags)
1831{
1832 __u16 magic = le16_to_cpu(es->s_encoding);
1833 int i;
1834
1835 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1836 if (magic == ext4_sb_encoding_map[i].magic)
1837 break;
1838
1839 if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1840 return -EINVAL;
1841
1842 *encoding = &ext4_sb_encoding_map[i];
1843 *flags = le16_to_cpu(es->s_encoding_flags);
1844
1845 return 0;
1846}
1847#endif
1848
26092bf5
TT		 1849static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1850 substring_t *args, unsigned long *journal_devnum,
1851 unsigned int *journal_ioprio, int is_remount)
1852{
1853 struct ext4_sb_info *sbi = EXT4_SB(sb);
1854 const struct mount_opts *m;
08cefc7a
EB		 1855 kuid_t uid;
1856 kgid_t gid;
26092bf5
TT		 1857 int arg = 0;
1858
57f73c2c
TT		 1859#ifdef CONFIG_QUOTA
1860 if (token == Opt_usrjquota)
1861 return set_qf_name(sb, USRQUOTA, &args[0]);
1862 else if (token == Opt_grpjquota)
1863 return set_qf_name(sb, GRPQUOTA, &args[0]);
1864 else if (token == Opt_offusrjquota)
1865 return clear_qf_name(sb, USRQUOTA);
1866 else if (token == Opt_offgrpjquota)
1867 return clear_qf_name(sb, GRPQUOTA);
1868#endif
26092bf5 1869 switch (token) {
f7048605
TT		 1870 case Opt_noacl:
1871 case Opt_nouser_xattr:
1872 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1873 break;
26092bf5
TT		 1874 case Opt_sb:
1875 return 1; /* handled by get_sb_block() */
1876 case Opt_removed:
5f3633e3 1877 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1878 return 1;
26092bf5
TT		 1879 case Opt_abort:
1880 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1881 return 1;
1882 case Opt_i_version:
357fdad0 1883 sb->s_flags |= SB_I_VERSION;
26092bf5 1884 return 1;
a26f4992 1885 case Opt_lazytime:
1751e8a6 1886 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1887 return 1;
1888 case Opt_nolazytime:
1751e8a6 1889 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1890 return 1;
26092bf5
TT		 1891 }
1892
5f3633e3
JK		 1893 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1894 if (token == m->token)
1895 break;
1896
1897 if (m->token == Opt_err) {
1898 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1899 "or missing value", opt);
1900 return -1;
1901 }
1902
8dc0aa8c
TT		 1903 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1904 ext4_msg(sb, KERN_ERR,
1905 "Mount option \"%s\" incompatible with ext2", opt);
1906 return -1;
1907 }
1908 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1909 ext4_msg(sb, KERN_ERR,
1910 "Mount option \"%s\" incompatible with ext3", opt);
1911 return -1;
1912 }
1913
ad4eec61 1914 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1915 return -1;
1916 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1917 return -1;
c93cf2d7
DM		 1918 if (m->flags & MOPT_EXPLICIT) {
1919 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1920 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1921 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1922 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1923 } else
1924 return -1;
1925 }
5f3633e3
JK		 1926 if (m->flags & MOPT_CLEAR_ERR)
1927 clear_opt(sb, ERRORS_MASK);
1928 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1929 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1930 "options when quota turned on");
1931 return -1;
1932 }
1933
1934 if (m->flags & MOPT_NOSUPPORT) {
1935 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1936 } else if (token == Opt_commit) {
1937 if (arg == 0)
1938 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
9ba55543 1939 else if (arg > INT_MAX / HZ) {
1940 ext4_msg(sb, KERN_ERR,
1941 "Invalid commit interval %d, "
1942 "must be smaller than %d",
1943 arg, INT_MAX / HZ);
1944 return -1;
1945 }
5f3633e3 1946 sbi->s_commit_interval = HZ * arg;
670e9875 1947 } else if (token == Opt_debug_want_extra_isize) {
9803387c
TT		 1948 if ((arg & 1) ||
1949 (arg < 4) ||
1950 (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
1951 ext4_msg(sb, KERN_ERR,
1952 "Invalid want_extra_isize %d", arg);
1953 return -1;
1954 }
670e9875 1955 sbi->s_want_extra_isize = arg;
5f3633e3 1956 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1957 sbi->s_max_batch_time = arg;
1958 } else if (token == Opt_min_batch_time) {
1959 sbi->s_min_batch_time = arg;
1960 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1961 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1962 ext4_msg(sb, KERN_ERR,
1963 "EXT4-fs: inode_readahead_blks must be "
1964 "0 or a power of 2 smaller than 2^31");
26092bf5 1965 return -1;
5f3633e3
JK		 1966 }
1967 sbi->s_inode_readahead_blks = arg;
1968 } else if (token == Opt_init_itable) {
1969 set_opt(sb, INIT_INODE_TABLE);
1970 if (!args->from)
1971 arg = EXT4_DEF_LI_WAIT_MULT;
1972 sbi->s_li_wait_mult = arg;
1973 } else if (token == Opt_max_dir_size_kb) {
1974 sbi->s_max_dir_size_kb = arg;
1975 } else if (token == Opt_stripe) {
1976 sbi->s_stripe = arg;
1977 } else if (token == Opt_resuid) {
1978 uid = make_kuid(current_user_ns(), arg);
1979 if (!uid_valid(uid)) {
1980 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1981 return -1;
1982 }
5f3633e3
JK		 1983 sbi->s_resuid = uid;
1984 } else if (token == Opt_resgid) {
1985 gid = make_kgid(current_user_ns(), arg);
1986 if (!gid_valid(gid)) {
1987 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1988 return -1;
1989 }
1990 sbi->s_resgid = gid;
1991 } else if (token == Opt_journal_dev) {
1992 if (is_remount) {
1993 ext4_msg(sb, KERN_ERR,
1994 "Cannot specify journal on remount");
1995 return -1;
1996 }
1997 *journal_devnum = arg;
ad4eec61
ES		 1998 } else if (token == Opt_journal_path) {
1999 char *journal_path;
2000 struct inode *journal_inode;
2001 struct path path;
2002 int error;
2003
2004 if (is_remount) {
2005 ext4_msg(sb, KERN_ERR,
2006 "Cannot specify journal on remount");
2007 return -1;
2008 }
2009 journal_path = match_strdup(&args[0]);
2010 if (!journal_path) {
2011 ext4_msg(sb, KERN_ERR, "error: could not dup "
2012 "journal device string");
2013 return -1;
2014 }
2015
2016 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
2017 if (error) {
2018 ext4_msg(sb, KERN_ERR, "error: could not find "
2019 "journal device path: error %d", error);
2020 kfree(journal_path);
2021 return -1;
2022 }
2023
2b0143b5 2024 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 2025 if (!S_ISBLK(journal_inode->i_mode)) {
2026 ext4_msg(sb, KERN_ERR, "error: journal path %s "
2027 "is not a block device", journal_path);
2028 path_put(&path);
2029 kfree(journal_path);
2030 return -1;
2031 }
2032
2033 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
2034 path_put(&path);
2035 kfree(journal_path);
5f3633e3
JK		 2036 } else if (token == Opt_journal_ioprio) {
2037 if (arg > 7) {
2038 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
2039 " (must be 0-7)");
2040 return -1;
2041 }
2042 *journal_ioprio =
2043 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447 2044 } else if (token == Opt_test_dummy_encryption) {
643fa961 2045#ifdef CONFIG_FS_ENCRYPTION
6ddb2447
TT		 2046 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
2047 ext4_msg(sb, KERN_WARNING,
2048 "Test dummy encryption mode enabled");
2049#else
2050 ext4_msg(sb, KERN_WARNING,
2051 "Test dummy encryption mount option ignored");
2052#endif
5f3633e3
JK		 2053 } else if (m->flags & MOPT_DATAJ) {
2054 if (is_remount) {
2055 if (!sbi->s_journal)
2056 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2057 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 2058 ext4_msg(sb, KERN_ERR,
26092bf5 2059 "Cannot change data mode on remount");
26092bf5 2060 return -1;
ac27a0ec 2061 }
26092bf5 2062 } else {
5f3633e3
JK		 2063 clear_opt(sb, DATA_FLAGS);
2064 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 2065 }
5f3633e3
JK		 2066#ifdef CONFIG_QUOTA
2067 } else if (m->flags & MOPT_QFMT) {
2068 if (sb_any_quota_loaded(sb) &&
2069 sbi->s_jquota_fmt != m->mount_opt) {
2070 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2071 "quota options when quota turned on");
2072 return -1;
2073 }
e2b911c5 2074 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 2075 ext4_msg(sb, KERN_INFO,
2076 "Quota format mount options ignored "
262b4662 2077 "when QUOTA feature is enabled");
c325a67c 2078 return 1;
262b4662 2079 }
5f3633e3 2080 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 2081#endif
923ae0ff 2082 } else if (token == Opt_dax) {
ef83b6e8
DW		 2083#ifdef CONFIG_FS_DAX
2084 ext4_msg(sb, KERN_WARNING,
2085 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
a92abd73 2086 sbi->s_mount_opt |= m->mount_opt;
ef83b6e8 2087#else
923ae0ff
RZ		 2088 ext4_msg(sb, KERN_INFO, "dax option not supported");
2089 return -1;
5f3633e3 2090#endif
7915a861
AN		 2091 } else if (token == Opt_data_err_abort) {
2092 sbi->s_mount_opt |= m->mount_opt;
2093 } else if (token == Opt_data_err_ignore) {
2094 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 2095 } else {
2096 if (!args->from)
2097 arg = 1;
2098 if (m->flags & MOPT_CLEAR)
2099 arg = !arg;
2100 else if (unlikely(!(m->flags & MOPT_SET))) {
2101 ext4_msg(sb, KERN_WARNING,
2102 "buggy handling of option %s", opt);
2103 WARN_ON(1);
2104 return -1;
2105 }
2106 if (arg != 0)
2107 sbi->s_mount_opt |= m->mount_opt;
2108 else
2109 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 2110 }
5f3633e3 2111 return 1;
26092bf5
TT		 2112}
2113
2114static int parse_options(char *options, struct super_block *sb,
2115 unsigned long *journal_devnum,
2116 unsigned int *journal_ioprio,
2117 int is_remount)
2118{
1e1a76ed 2119 struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb);
33458eab 2120 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
26092bf5
TT		 2121 substring_t args[MAX_OPT_ARGS];
2122 int token;
2123
2124 if (!options)
2125 return 1;
2126
2127 while ((p = strsep(&options, ",")) != NULL) {
2128 if (!*p)
2129 continue;
2130 /*
2131 * Initialize args struct so we know whether arg was
2132 * found; some options take optional arguments.
2133 */
caecd0af 2134 args[0].to = args[0].from = NULL;
26092bf5
TT		 2135 token = match_token(p, tokens, args);
2136 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2137 journal_ioprio, is_remount) < 0)
2138 return 0;
ac27a0ec
DK		 2139 }
2140#ifdef CONFIG_QUOTA
49da9392
JK		 2141 /*
2142 * We do the test below only for project quotas. 'usrquota' and
2143 * 'grpquota' mount options are allowed even without quota feature
2144 * to support legacy quotas in quota files.
2145 */
2146 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2147 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2148 "Cannot enable project quota enforcement.");
2149 return 0;
2150 }
33458eab
TT		 2151 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2152 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2153 if (usr_qf_name || grp_qf_name) {
2154 if (test_opt(sb, USRQUOTA) && usr_qf_name)
fd8c37ec 2155 clear_opt(sb, USRQUOTA);
ac27a0ec 2156
33458eab 2157 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
fd8c37ec 2158 clear_opt(sb, GRPQUOTA);
ac27a0ec 2159
56c50f11 2160 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 2161 ext4_msg(sb, KERN_ERR, "old and new quota "
2162 "format mixing");
ac27a0ec
DK		 2163 return 0;
2164 }
2165
2166 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 2167 ext4_msg(sb, KERN_ERR, "journaled quota format "
2168 "not specified");
ac27a0ec
DK		 2169 return 0;
2170 }
ac27a0ec
DK		 2171 }
2172#endif
2173 return 1;
2174}
2175
2adf6da8
TT		 2176static inline void ext4_show_quota_options(struct seq_file *seq,
2177 struct super_block *sb)
2178{
2179#if defined(CONFIG_QUOTA)
2180 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2181 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2182
2183 if (sbi->s_jquota_fmt) {
2184 char *fmtname = "";
2185
2186 switch (sbi->s_jquota_fmt) {
2187 case QFMT_VFS_OLD:
2188 fmtname = "vfsold";
2189 break;
2190 case QFMT_VFS_V0:
2191 fmtname = "vfsv0";
2192 break;
2193 case QFMT_VFS_V1:
2194 fmtname = "vfsv1";
2195 break;
2196 }
2197 seq_printf(seq, ",jqfmt=%s", fmtname);
2198 }
2199
33458eab
TT		 2200 rcu_read_lock();
2201 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2202 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2203 if (usr_qf_name)
2204 seq_show_option(seq, "usrjquota", usr_qf_name);
2205 if (grp_qf_name)
2206 seq_show_option(seq, "grpjquota", grp_qf_name);
2207 rcu_read_unlock();
2adf6da8
TT		 2208#endif
2209}
2210
5a916be1
TT		 2211static const char *token2str(int token)
2212{
50df9fd5 2213 const struct match_token *t;
5a916be1
TT		 2214
2215 for (t = tokens; t->token != Opt_err; t++)
2216 if (t->token == token && !strchr(t->pattern, '='))
2217 break;
2218 return t->pattern;
2219}
2220
2adf6da8
TT		 2221/*
2222 * Show an option if
2223 * - it's set to a non-default value OR
2224 * - if the per-sb default is different from the global default
2225 */
66acdcf4
TT		 2226static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2227 int nodefs)
2adf6da8 2228{
2adf6da8
TT		 2229 struct ext4_sb_info *sbi = EXT4_SB(sb);
2230 struct ext4_super_block *es = sbi->s_es;
68afa7e0 2231 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
5a916be1 2232 const struct mount_opts *m;
66acdcf4 2233 char sep = nodefs ? '\n' : ',';
2adf6da8 2234
66acdcf4
TT		 2235#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2236#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2237
2238 if (sbi->s_sb_block != 1)
5a916be1
TT		 2239 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2240
2241 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2242 int want_set = m->flags & MOPT_SET;
2243 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2244 (m->flags & MOPT_CLEAR_ERR))
2245 continue;
68afa7e0 2246 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2247 continue; /* skip if same as the default */
2248 if ((want_set &&
2249 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2250 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2251 continue; /* select Opt_noFoo vs Opt_Foo */
2252 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2253 }
5a916be1 2254
08cefc7a 2255 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2256 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2257 SEQ_OPTS_PRINT("resuid=%u",
2258 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2259 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2260 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2261 SEQ_OPTS_PRINT("resgid=%u",
2262 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2263 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2264 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2265 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2266 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2267 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2268 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2269 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2270 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2271 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2272 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2273 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2274 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2275 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2276 if (sb->s_flags & SB_I_VERSION)
5a916be1 2277 SEQ_OPTS_PUTS("i_version");
66acdcf4 2278 if (nodefs || sbi->s_stripe)
5a916be1 2279 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0
TN		 2280 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2281 (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2282 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2283 SEQ_OPTS_PUTS("data=journal");
2284 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2285 SEQ_OPTS_PUTS("data=ordered");
2286 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2287 SEQ_OPTS_PUTS("data=writeback");
2288 }
66acdcf4
TT		 2289 if (nodefs ||
2290 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2291 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2292 sbi->s_inode_readahead_blks);
2adf6da8 2293
ceec0376 2294 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 2295 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2296 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2297 if (nodefs || sbi->s_max_dir_size_kb)
2298 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2299 if (test_opt(sb, DATA_ERR_ABORT))
2300 SEQ_OPTS_PUTS("data_err=abort");
338affb5
EB		 2301 if (DUMMY_ENCRYPTION_ENABLED(sbi))
2302 SEQ_OPTS_PUTS("test_dummy_encryption");
2adf6da8
TT		 2303
2304 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2305 return 0;
2306}
2307
66acdcf4
TT		 2308static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2309{
2310 return _ext4_show_options(seq, root->d_sb, 0);
2311}
2312
ebd173be 2313int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2314{
2315 struct super_block *sb = seq->private;
2316 int rc;
2317
bc98a42c 2318 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2319 rc = _ext4_show_options(seq, sb, 1);
2320 seq_puts(seq, "\n");
2321 return rc;
2322}
2323
617ba13b 2324static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2325 int read_only)
2326{
617ba13b 2327 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 2328 int err = 0;
ac27a0ec 2329
617ba13b 2330 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2331 ext4_msg(sb, KERN_ERR, "revision level too high, "
2332 "forcing read-only mode");
c89128a0 2333 err = -EROFS;
ac27a0ec
DK		 2334 }
2335 if (read_only)
281b5995 2336 goto done;
617ba13b 2337 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2338 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2339 "running e2fsck is recommended");
c8b459f4 2340 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2341 ext4_msg(sb, KERN_WARNING,
2342 "warning: mounting fs with errors, "
2343 "running e2fsck is recommended");
ed3ce80a 2344 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2345 le16_to_cpu(es->s_mnt_count) >=
2346 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2347 ext4_msg(sb, KERN_WARNING,
2348 "warning: maximal mount count reached, "
2349 "running e2fsck is recommended");
ac27a0ec 2350 else if (le32_to_cpu(es->s_checkinterval) &&
6a0678a7
AB		 2351 (ext4_get_tstamp(es, s_lastcheck) +
2352 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
b31e1552
ES		 2353 ext4_msg(sb, KERN_WARNING,
2354 "warning: checktime reached, "
2355 "running e2fsck is recommended");
0b8e58a1 2356 if (!sbi->s_journal)
0390131b 2357 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2358 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2359 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2360 le16_add_cpu(&es->s_mnt_count, 1);
6a0678a7 2361 ext4_update_tstamp(es, s_mtime);
0390131b 2362 if (sbi->s_journal)
e2b911c5 2363 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2364
c89128a0 2365 err = ext4_commit_super(sb, 1);
281b5995 2366done:
ac27a0ec 2367 if (test_opt(sb, DEBUG))
a9df9a49 2368 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2369 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2370 sb->s_blocksize,
2371 sbi->s_groups_count,
617ba13b
MC		 2372 EXT4_BLOCKS_PER_GROUP(sb),
2373 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2374 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2375
7abc52c2 2376 cleancache_init_fs(sb);
c89128a0 2377 return err;
ac27a0ec
DK		 2378}
2379
117fff10
TT		 2380int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2381{
2382 struct ext4_sb_info *sbi = EXT4_SB(sb);
2383 struct flex_groups *new_groups;
2384 int size;
2385
2386 if (!sbi->s_log_groups_per_flex)
2387 return 0;
2388
2389 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2390 if (size <= sbi->s_flex_groups_allocated)
2391 return 0;
2392
2393 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
a7c3e901 2394 new_groups = kvzalloc(size, GFP_KERNEL);
117fff10
TT		 2395 if (!new_groups) {
2396 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2397 size / (int) sizeof(struct flex_groups));
2398 return -ENOMEM;
2399 }
2400
2401 if (sbi->s_flex_groups) {
2402 memcpy(new_groups, sbi->s_flex_groups,
2403 (sbi->s_flex_groups_allocated *
2404 sizeof(struct flex_groups)));
b93b41d4 2405 kvfree(sbi->s_flex_groups);
117fff10
TT		 2406 }
2407 sbi->s_flex_groups = new_groups;
2408 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2409 return 0;
2410}
2411
772cb7c8
JS		 2412static int ext4_fill_flex_info(struct super_block *sb)
2413{
2414 struct ext4_sb_info *sbi = EXT4_SB(sb);
2415 struct ext4_group_desc *gdp = NULL;
772cb7c8 2416 ext4_group_t flex_group;
117fff10 2417 int i, err;
772cb7c8 2418
503358ae 2419 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2420 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2421 sbi->s_log_groups_per_flex = 0;
2422 return 1;
2423 }
2424
117fff10
TT		 2425 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2426 if (err)
9933fc0a 2427 goto failed;
772cb7c8 2428
772cb7c8 2429 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2430 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2431
2432 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2433 atomic_add(ext4_free_inodes_count(sb, gdp),
2434 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2435 atomic64_add(ext4_free_group_clusters(sb, gdp),
2436 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2437 atomic_add(ext4_used_dirs_count(sb, gdp),
2438 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2439 }
2440
2441 return 1;
2442failed:
2443 return 0;
2444}
2445
e2b911c5 2446static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2447 struct ext4_group_desc *gdp)
717d50e4 2448{
b47820ed 2449 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2450 __u16 crc = 0;
feb0ab32 2451 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2452 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2453
9aa5d32b 2454 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2455 /* Use new metadata_csum algorithm */
feb0ab32 2456 __u32 csum32;
b47820ed 2457 __u16 dummy_csum = 0;
feb0ab32 2458
feb0ab32
DW		 2459 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2460 sizeof(le_group));
b47820ed
DJ		 2461 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2462 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2463 sizeof(dummy_csum));
2464 offset += sizeof(dummy_csum);
2465 if (offset < sbi->s_desc_size)
2466 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2467 sbi->s_desc_size - offset);
feb0ab32
DW		 2468
2469 crc = csum32 & 0xFFFF;
2470 goto out;
717d50e4
AD		 2471 }
2472
feb0ab32 2473 /* old crc16 code */
e2b911c5 2474 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2475 return 0;
2476
feb0ab32
DW		 2477 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2478 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2479 crc = crc16(crc, (__u8 *)gdp, offset);
2480 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2481 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2482 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2483 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2484 crc = crc16(crc, (__u8 *)gdp + offset,
2485 le16_to_cpu(sbi->s_es->s_desc_size) -
2486 offset);
2487
2488out:
717d50e4
AD		 2489 return cpu_to_le16(crc);
2490}
2491
feb0ab32 2492int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2493 struct ext4_group_desc *gdp)
2494{
feb0ab32 2495 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2496 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2497 return 0;
2498
2499 return 1;
2500}
2501
feb0ab32
DW		 2502void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2503 struct ext4_group_desc *gdp)
2504{
2505 if (!ext4_has_group_desc_csum(sb))
2506 return;
e2b911c5 2507 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2508}
2509
ac27a0ec 2510/* Called at mount-time, super-block is locked */
bfff6873 2511static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2512 ext4_fsblk_t sb_block,
bfff6873 2513 ext4_group_t *first_not_zeroed)
ac27a0ec 2514{
617ba13b
MC		 2515 struct ext4_sb_info *sbi = EXT4_SB(sb);
2516 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2517 ext4_fsblk_t last_block;
44de022c 2518 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 2519 ext4_fsblk_t block_bitmap;
2520 ext4_fsblk_t inode_bitmap;
2521 ext4_fsblk_t inode_table;
ce421581 2522 int flexbg_flag = 0;
bfff6873 2523 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2524
e2b911c5 2525 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2526 flexbg_flag = 1;
2527
af5bc92d 2528 ext4_debug("Checking group descriptors");
ac27a0ec 2529
197cd65a
AM		 2530 for (i = 0; i < sbi->s_groups_count; i++) {
2531 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2532
ce421581 2533 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2534 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2535 else
2536 last_block = first_block +
617ba13b 2537 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2538
bfff6873
LC		 2539 if ((grp == sbi->s_groups_count) &&
2540 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2541 grp = i;
2542
8fadc143 2543 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2544 if (block_bitmap == sb_block) {
2545 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2546 "Block bitmap for group %u overlaps "
2547 "superblock", i);
18db4b4e
TT		 2548 if (!sb_rdonly(sb))
2549 return 0;
829fa70d 2550 }
77260807
TT		 2551 if (block_bitmap >= sb_block + 1 &&
2552 block_bitmap <= last_bg_block) {
2553 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2554 "Block bitmap for group %u overlaps "
2555 "block group descriptors", i);
2556 if (!sb_rdonly(sb))
2557 return 0;
2558 }
2b2d6d01 2559 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2560 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2561 "Block bitmap for group %u not in group "
b31e1552 2562 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2563 return 0;
2564 }
8fadc143 2565 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2566 if (inode_bitmap == sb_block) {
2567 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2568 "Inode bitmap for group %u overlaps "
2569 "superblock", i);
18db4b4e
TT		 2570 if (!sb_rdonly(sb))
2571 return 0;
829fa70d 2572 }
77260807
TT		 2573 if (inode_bitmap >= sb_block + 1 &&
2574 inode_bitmap <= last_bg_block) {
2575 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2576 "Inode bitmap for group %u overlaps "
2577 "block group descriptors", i);
2578 if (!sb_rdonly(sb))
2579 return 0;
2580 }
2b2d6d01 2581 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2582 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2583 "Inode bitmap for group %u not in group "
b31e1552 2584 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2585 return 0;
2586 }
8fadc143 2587 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2588 if (inode_table == sb_block) {
2589 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2590 "Inode table for group %u overlaps "
2591 "superblock", i);
18db4b4e
TT		 2592 if (!sb_rdonly(sb))
2593 return 0;
829fa70d 2594 }
77260807
TT		 2595 if (inode_table >= sb_block + 1 &&
2596 inode_table <= last_bg_block) {
2597 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2598 "Inode table for group %u overlaps "
2599 "block group descriptors", i);
2600 if (!sb_rdonly(sb))
2601 return 0;
2602 }
bd81d8ee 2603 if (inode_table < first_block ||
2b2d6d01 2604 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2605 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2606 "Inode table for group %u not in group "
b31e1552 2607 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2608 return 0;
2609 }
955ce5f5 2610 ext4_lock_group(sb, i);
feb0ab32 2611 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2612 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2613 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2614 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2615 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2616 if (!sb_rdonly(sb)) {
955ce5f5 2617 ext4_unlock_group(sb, i);
8a266467 2618 return 0;
7ee1ec4c 2619 }
717d50e4 2620 }
955ce5f5 2621 ext4_unlock_group(sb, i);
ce421581
JS		 2622 if (!flexbg_flag)
2623 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2624 }
bfff6873
LC		 2625 if (NULL != first_not_zeroed)
2626 *first_not_zeroed = grp;
ac27a0ec
DK		 2627 return 1;
2628}
2629
617ba13b 2630/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2631 * the superblock) which were deleted from all directories, but held open by
2632 * a process at the time of a crash. We walk the list and try to delete these
2633 * inodes at recovery time (only with a read-write filesystem).
2634 *
2635 * In order to keep the orphan inode chain consistent during traversal (in
2636 * case of crash during recovery), we link each inode into the superblock
2637 * orphan list_head and handle it the same way as an inode deletion during
2638 * normal operation (which journals the operations for us).
2639 *
2640 * We only do an iget() and an iput() on each inode, which is very safe if we
2641 * accidentally point at an in-use or already deleted inode. The worst that
2642 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2643 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2644 * e2fsck was run on this filesystem, and it must have already done the orphan
2645 * inode cleanup for us, so we can safely abort without any further action.
2646 */
2b2d6d01
TT		 2647static void ext4_orphan_cleanup(struct super_block *sb,
2648 struct ext4_super_block *es)
ac27a0ec
DK		 2649{
2650 unsigned int s_flags = sb->s_flags;
2c98eb5e 2651 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2652#ifdef CONFIG_QUOTA
95f1fda4 2653 int quota_update = 0;
ac27a0ec
DK		 2654 int i;
2655#endif
2656 if (!es->s_last_orphan) {
2657 jbd_debug(4, "no orphan inodes to clean up\n");
2658 return;
2659 }
2660
a8f48a95 2661 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2662 ext4_msg(sb, KERN_ERR, "write access "
2663 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2664 return;
2665 }
2666
d39195c3
AG		 2667 /* Check if feature set would not allow a r/w mount */
2668 if (!ext4_feature_set_ok(sb, 0)) {
2669 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2670 "unknown ROCOMPAT features");
2671 return;
2672 }
2673
617ba13b 2674 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2675 /* don't clear list on RO mount w/ errors */
1751e8a6 2676 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2677 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2678 "clearing orphan list.\n");
c25f9bc6
ES		 2679 es->s_last_orphan = 0;
2680 }
ac27a0ec
DK		 2681 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2682 return;
2683 }
2684
1751e8a6 2685 if (s_flags & SB_RDONLY) {
b31e1552 2686 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2687 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2688 }
2689#ifdef CONFIG_QUOTA
2690 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2691 sb->s_flags |= SB_ACTIVE;
95f1fda4 2692
2693 /*
2694 * Turn on quotas which were not enabled for read-only mounts if
2695 * filesystem has quota feature, so that they are updated correctly.
2696 */
1751e8a6 2697 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2698 int ret = ext4_enable_quotas(sb);
2699
2700 if (!ret)
2701 quota_update = 1;
2702 else
2703 ext4_msg(sb, KERN_ERR,
2704 "Cannot turn on quotas: error %d", ret);
2705 }
2706
2707 /* Turn on journaled quotas used for old sytle */
a2d4a646 2708 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2709 if (EXT4_SB(sb)->s_qf_names[i]) {
2710 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2711
2712 if (!ret)
2713 quota_update = 1;
2714 else
b31e1552
ES		 2715 ext4_msg(sb, KERN_ERR,
2716 "Cannot turn on journaled "
95f1fda4 2717 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2718 }
2719 }
2720#endif
2721
2722 while (es->s_last_orphan) {
2723 struct inode *inode;
2724
c65d5c6c
VN		 2725 /*
2726 * We may have encountered an error during cleanup; if
2727 * so, skip the rest.
2728 */
2729 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2730 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2731 es->s_last_orphan = 0;
2732 break;
2733 }
2734
97bd42b9
JB		 2735 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2736 if (IS_ERR(inode)) {
ac27a0ec
DK		 2737 es->s_last_orphan = 0;
2738 break;
2739 }
2740
617ba13b 2741 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2742 dquot_initialize(inode);
ac27a0ec 2743 if (inode->i_nlink) {
566370a2
PT		 2744 if (test_opt(sb, DEBUG))
2745 ext4_msg(sb, KERN_DEBUG,
2746 "%s: truncating inode %lu to %lld bytes",
2747 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2748 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2749 inode->i_ino, inode->i_size);
5955102c 2750 inode_lock(inode);
55f252c9 2751 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2752 ret = ext4_truncate(inode);
2753 if (ret)
2754 ext4_std_error(inode->i_sb, ret);
5955102c 2755 inode_unlock(inode);
ac27a0ec
DK		 2756 nr_truncates++;
2757 } else {
566370a2
PT		 2758 if (test_opt(sb, DEBUG))
2759 ext4_msg(sb, KERN_DEBUG,
2760 "%s: deleting unreferenced inode %lu",
2761 __func__, inode->i_ino);
ac27a0ec
DK		 2762 jbd_debug(2, "deleting unreferenced inode %lu\n",
2763 inode->i_ino);
2764 nr_orphans++;
2765 }
2766 iput(inode); /* The delete magic happens here! */
2767 }
2768
2b2d6d01 2769#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2770
2771 if (nr_orphans)
b31e1552
ES		 2772 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2773 PLURAL(nr_orphans));
ac27a0ec 2774 if (nr_truncates)
b31e1552
ES		 2775 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2776 PLURAL(nr_truncates));
ac27a0ec 2777#ifdef CONFIG_QUOTA
95f1fda4 2778 /* Turn off quotas if they were enabled for orphan cleanup */
2779 if (quota_update) {
2780 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2781 if (sb_dqopt(sb)->files[i])
2782 dquot_quota_off(sb, i);
2783 }
ac27a0ec
DK		 2784 }
2785#endif
1751e8a6 2786 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2787}
0b8e58a1 2788
cd2291a4
ES		 2789/*
2790 * Maximal extent format file size.
2791 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2792 * extent format containers, within a sector_t, and within i_blocks
2793 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2794 * so that won't be a limiting factor.
2795 *
f17722f9
LC		 2796 * However there is other limiting factor. We do store extents in the form
2797 * of starting block and length, hence the resulting length of the extent
2798 * covering maximum file size must fit into on-disk format containers as
2799 * well. Given that length is always by 1 unit bigger than max unit (because
2800 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2801 *
cd2291a4
ES		 2802 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2803 */
f287a1a5 2804static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2805{
2806 loff_t res;
2807 loff_t upper_limit = MAX_LFS_FILESIZE;
2808
72deb455
CH		 2809 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2810
2811 if (!has_huge_files) {
cd2291a4
ES		 2812 upper_limit = (1LL << 32) - 1;
2813
2814 /* total blocks in file system block size */
2815 upper_limit >>= (blkbits - 9);
2816 upper_limit <<= blkbits;
2817 }
2818
f17722f9
LC		 2819 /*
2820 * 32-bit extent-start container, ee_block. We lower the maxbytes
2821 * by one fs block, so ee_len can cover the extent of maximum file
2822 * size
2823 */
2824 res = (1LL << 32) - 1;
cd2291a4 2825 res <<= blkbits;
cd2291a4
ES		 2826
2827 /* Sanity check against vm- & vfs- imposed limits */
2828 if (res > upper_limit)
2829 res = upper_limit;
2830
2831 return res;
2832}
ac27a0ec 2833
ac27a0ec 2834/*
cd2291a4 2835 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2836 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2837 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2838 */
f287a1a5 2839static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2840{
617ba13b 2841 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2842 int meta_blocks;
2843 loff_t upper_limit;
0b8e58a1
AD		 2844 /* This is calculated to be the largest file size for a dense, block
2845 * mapped file such that the file's total number of 512-byte sectors,
2846 * including data and all indirect blocks, does not exceed (2^48 - 1).
2847 *
2848 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2849 * number of 512-byte sectors of the file.
0fc1b451
AK		 2850 */
2851
72deb455 2852 if (!has_huge_files) {
0fc1b451 2853 /*
72deb455
CH		 2854 * !has_huge_files or implies that the inode i_block field
2855 * represents total file blocks in 2^32 512-byte sectors ==
2856 * size of vfs inode i_blocks * 8
0fc1b451
AK		 2857 */
2858 upper_limit = (1LL << 32) - 1;
2859
2860 /* total blocks in file system block size */
2861 upper_limit >>= (bits - 9);
2862
2863 } else {
8180a562
AK		 2864 /*
2865 * We use 48 bit ext4_inode i_blocks
2866 * With EXT4_HUGE_FILE_FL set the i_blocks
2867 * represent total number of blocks in
2868 * file system block size
2869 */
0fc1b451
AK		 2870 upper_limit = (1LL << 48) - 1;
2871
0fc1b451
AK		 2872 }
2873
2874 /* indirect blocks */
2875 meta_blocks = 1;
2876 /* double indirect blocks */
2877 meta_blocks += 1 + (1LL << (bits-2));
2878 /* tripple indirect blocks */
2879 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2880
2881 upper_limit -= meta_blocks;
2882 upper_limit <<= bits;
ac27a0ec
DK		 2883
2884 res += 1LL << (bits-2);
2885 res += 1LL << (2*(bits-2));
2886 res += 1LL << (3*(bits-2));
2887 res <<= bits;
2888 if (res > upper_limit)
2889 res = upper_limit;
0fc1b451
AK		 2890
2891 if (res > MAX_LFS_FILESIZE)
2892 res = MAX_LFS_FILESIZE;
2893
ac27a0ec
DK		 2894 return res;
2895}
2896
617ba13b 2897static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2898 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2899{
617ba13b 2900 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2901 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2902 int has_super = 0;
2903
2904 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2905
e2b911c5 2906 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2907 return logical_sb_block + nr + 1;
ac27a0ec 2908 bg = sbi->s_desc_per_block * nr;
617ba13b 2909 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2910 has_super = 1;
0b8e58a1 2911
bd63f6b0
DW		 2912 /*
2913 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2914 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2915 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2916 * compensate.
2917 */
2918 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 2919 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 2920 has_super++;
2921
617ba13b 2922 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2923}
2924
c9de560d
AT		 2925/**
2926 * ext4_get_stripe_size: Get the stripe size.
2927 * @sbi: In memory super block info
2928 *
2929 * If we have specified it via mount option, then
2930 * use the mount option value. If the value specified at mount time is
2931 * greater than the blocks per group use the super block value.
2932 * If the super block value is greater than blocks per group return 0.
2933 * Allocator needs it be less than blocks per group.
2934 *
2935 */
2936static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2937{
2938 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2939 unsigned long stripe_width =
2940 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2941 int ret;
c9de560d
AT		 2942
2943 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2944 ret = sbi->s_stripe;
5469d7c3 2945 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2946 ret = stripe_width;
5469d7c3 2947 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2948 ret = stride;
2949 else
2950 ret = 0;
c9de560d 2951
3eb08658
DE		 2952 /*
2953 * If the stripe width is 1, this makes no sense and
2954 * we set it to 0 to turn off stripe handling code.
2955 */
2956 if (ret <= 1)
2957 ret = 0;
c9de560d 2958
3eb08658 2959 return ret;
c9de560d 2960}
ac27a0ec 2961
a13fb1a4
ES		 2962/*
2963 * Check whether this filesystem can be mounted based on
2964 * the features present and the RDONLY/RDWR mount requested.
2965 * Returns 1 if this filesystem can be mounted as requested,
2966 * 0 if it cannot be.
2967 */
2968static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2969{
e2b911c5 2970 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2971 ext4_msg(sb, KERN_ERR,
2972 "Couldn't mount because of "
2973 "unsupported optional features (%x)",
2974 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2975 ~EXT4_FEATURE_INCOMPAT_SUPP));
2976 return 0;
2977 }
2978
c83ad55e
GKB		 2979#ifndef CONFIG_UNICODE
2980 if (ext4_has_feature_casefold(sb)) {
2981 ext4_msg(sb, KERN_ERR,
2982 "Filesystem with casefold feature cannot be "
2983 "mounted without CONFIG_UNICODE");
2984 return 0;
2985 }
2986#endif
2987
a13fb1a4
ES		 2988 if (readonly)
2989 return 1;
2990
e2b911c5 2991 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 2992 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 2993 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 2994 return 1;
2995 }
2996
a13fb1a4 2997 /* Check that feature set is OK for a read-write mount */
e2b911c5 2998 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2999 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3000 "unsupported optional features (%x)",
3001 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3002 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3003 return 0;
3004 }
e2b911c5 3005 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 3006 ext4_msg(sb, KERN_ERR,
3007 "Can't support bigalloc feature without "
3008 "extents feature\n");
3009 return 0;
3010 }
7c319d32 3011
d65d87a0
TT		 3012#if !defined(CONFIG_QUOTA) || !defined(CONFIG_QFMT_V2)
3013 if (!readonly && (ext4_has_feature_quota(sb) ||
3014 ext4_has_feature_project(sb))) {
7c319d32 3015 ext4_msg(sb, KERN_ERR,
d65d87a0 3016 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
689c958c
LX		 3017 return 0;
3018 }
7c319d32 3019#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 3020 return 1;
3021}
3022
66e61a9e
TT		 3023/*
3024 * This function is called once a day if we have errors logged
3025 * on the file system
3026 */
235699a8 3027static void print_daily_error_info(struct timer_list *t)
66e61a9e 3028{
235699a8
KC		 3029 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3030 struct super_block *sb = sbi->s_sb;
3031 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 3032
3033 if (es->s_error_count)
ae0f78de
TT		 3034 /* fsck newer than v1.41.13 is needed to clean this condition. */
3035 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 3036 le32_to_cpu(es->s_error_count));
3037 if (es->s_first_error_time) {
6a0678a7
AB		 3038 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3039 sb->s_id,
3040 ext4_get_tstamp(es, s_first_error_time),
66e61a9e
TT		 3041 (int) sizeof(es->s_first_error_func),
3042 es->s_first_error_func,
3043 le32_to_cpu(es->s_first_error_line));
3044 if (es->s_first_error_ino)
651e1c3b 3045 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3046 le32_to_cpu(es->s_first_error_ino));
3047 if (es->s_first_error_block)
651e1c3b 3048 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3049 le64_to_cpu(es->s_first_error_block));
651e1c3b 3050 printk(KERN_CONT "\n");
66e61a9e
TT		 3051 }
3052 if (es->s_last_error_time) {
6a0678a7
AB		 3053 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3054 sb->s_id,
3055 ext4_get_tstamp(es, s_last_error_time),
66e61a9e
TT		 3056 (int) sizeof(es->s_last_error_func),
3057 es->s_last_error_func,
3058 le32_to_cpu(es->s_last_error_line));
3059 if (es->s_last_error_ino)
651e1c3b 3060 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3061 le32_to_cpu(es->s_last_error_ino));
3062 if (es->s_last_error_block)
651e1c3b 3063 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3064 le64_to_cpu(es->s_last_error_block));
651e1c3b 3065 printk(KERN_CONT "\n");
66e61a9e
TT		 3066 }
3067 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3068}
3069
bfff6873
LC		 3070/* Find next suitable group and run ext4_init_inode_table */
3071static int ext4_run_li_request(struct ext4_li_request *elr)
3072{
3073 struct ext4_group_desc *gdp = NULL;
3074 ext4_group_t group, ngroups;
3075 struct super_block *sb;
3076 unsigned long timeout = 0;
3077 int ret = 0;
3078
3079 sb = elr->lr_super;
3080 ngroups = EXT4_SB(sb)->s_groups_count;
3081
3082 for (group = elr->lr_next_group; group < ngroups; group++) {
3083 gdp = ext4_get_group_desc(sb, group, NULL);
3084 if (!gdp) {
3085 ret = 1;
3086 break;
3087 }
3088
3089 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3090 break;
3091 }
3092
7f511862 3093 if (group >= ngroups)
bfff6873
LC		 3094 ret = 1;
3095
3096 if (!ret) {
3097 timeout = jiffies;
3098 ret = ext4_init_inode_table(sb, group,
3099 elr->lr_timeout ? 0 : 1);
3100 if (elr->lr_timeout == 0) {
51ce6511
LC		 3101 timeout = (jiffies - timeout) *
3102 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 3103 elr->lr_timeout = timeout;
3104 }
3105 elr->lr_next_sched = jiffies + elr->lr_timeout;
3106 elr->lr_next_group = group + 1;
3107 }
bfff6873
LC		 3108 return ret;
3109}
3110
3111/*
3112 * Remove lr_request from the list_request and free the
4ed5c033 3113 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 3114 */
3115static void ext4_remove_li_request(struct ext4_li_request *elr)
3116{
3117 struct ext4_sb_info *sbi;
3118
3119 if (!elr)
3120 return;
3121
3122 sbi = elr->lr_sbi;
3123
3124 list_del(&elr->lr_request);
3125 sbi->s_li_request = NULL;
3126 kfree(elr);
3127}
3128
3129static void ext4_unregister_li_request(struct super_block *sb)
3130{
1bb933fb
LC		 3131 mutex_lock(&ext4_li_mtx);
3132 if (!ext4_li_info) {
3133 mutex_unlock(&ext4_li_mtx);
bfff6873 3134 return;
1bb933fb 3135 }
bfff6873
LC		 3136
3137 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3138 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3139 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3140 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3141}
3142
8f1f7453
ES		 3143static struct task_struct *ext4_lazyinit_task;
3144
bfff6873
LC		 3145/*
3146 * This is the function where ext4lazyinit thread lives. It walks
3147 * through the request list searching for next scheduled filesystem.
3148 * When such a fs is found, run the lazy initialization request
3149 * (ext4_rn_li_request) and keep track of the time spend in this
3150 * function. Based on that time we compute next schedule time of
3151 * the request. When walking through the list is complete, compute
3152 * next waking time and put itself into sleep.
3153 */
3154static int ext4_lazyinit_thread(void *arg)
3155{
3156 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3157 struct list_head *pos, *n;
3158 struct ext4_li_request *elr;
4ed5c033 3159 unsigned long next_wakeup, cur;
bfff6873
LC		 3160
3161 BUG_ON(NULL == eli);
3162
bfff6873
LC		 3163cont_thread:
3164 while (true) {
3165 next_wakeup = MAX_JIFFY_OFFSET;
3166
3167 mutex_lock(&eli->li_list_mtx);
3168 if (list_empty(&eli->li_request_list)) {
3169 mutex_unlock(&eli->li_list_mtx);
3170 goto exit_thread;
3171 }
bfff6873 3172 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3173 int err = 0;
3174 int progress = 0;
bfff6873
LC		 3175 elr = list_entry(pos, struct ext4_li_request,
3176 lr_request);
3177
e22834f0
DM		 3178 if (time_before(jiffies, elr->lr_next_sched)) {
3179 if (time_before(elr->lr_next_sched, next_wakeup))
3180 next_wakeup = elr->lr_next_sched;
3181 continue;
3182 }
3183 if (down_read_trylock(&elr->lr_super->s_umount)) {
3184 if (sb_start_write_trylock(elr->lr_super)) {
3185 progress = 1;
3186 /*
3187 * We hold sb->s_umount, sb can not
3188 * be removed from the list, it is
3189 * now safe to drop li_list_mtx
3190 */
3191 mutex_unlock(&eli->li_list_mtx);
3192 err = ext4_run_li_request(elr);
3193 sb_end_write(elr->lr_super);
3194 mutex_lock(&eli->li_list_mtx);
3195 n = pos->next;
b2c78cd0 3196 }
e22834f0
DM		 3197 up_read((&elr->lr_super->s_umount));
3198 }
3199 /* error, remove the lazy_init job */
3200 if (err) {
3201 ext4_remove_li_request(elr);
3202 continue;
3203 }
3204 if (!progress) {
3205 elr->lr_next_sched = jiffies +
3206 (prandom_u32()
3207 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3208 }
bfff6873
LC		 3209 if (time_before(elr->lr_next_sched, next_wakeup))
3210 next_wakeup = elr->lr_next_sched;
3211 }
3212 mutex_unlock(&eli->li_list_mtx);
3213
a0acae0e 3214 try_to_freeze();
bfff6873 3215
4ed5c033
LC		 3216 cur = jiffies;
3217 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3218 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3219 cond_resched();
3220 continue;
3221 }
3222
4ed5c033
LC		 3223 schedule_timeout_interruptible(next_wakeup - cur);
3224
8f1f7453
ES		 3225 if (kthread_should_stop()) {
3226 ext4_clear_request_list();
3227 goto exit_thread;
3228 }
bfff6873
LC		 3229 }
3230
3231exit_thread:
3232 /*
3233 * It looks like the request list is empty, but we need
3234 * to check it under the li_list_mtx lock, to prevent any
3235 * additions into it, and of course we should lock ext4_li_mtx
3236 * to atomically free the list and ext4_li_info, because at
3237 * this point another ext4 filesystem could be registering
3238 * new one.
3239 */
3240 mutex_lock(&ext4_li_mtx);
3241 mutex_lock(&eli->li_list_mtx);
3242 if (!list_empty(&eli->li_request_list)) {
3243 mutex_unlock(&eli->li_list_mtx);
3244 mutex_unlock(&ext4_li_mtx);
3245 goto cont_thread;
3246 }
3247 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3248 kfree(ext4_li_info);
3249 ext4_li_info = NULL;
3250 mutex_unlock(&ext4_li_mtx);
3251
3252 return 0;
3253}
3254
3255static void ext4_clear_request_list(void)
3256{
3257 struct list_head *pos, *n;
3258 struct ext4_li_request *elr;
3259
3260 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3261 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3262 elr = list_entry(pos, struct ext4_li_request,
3263 lr_request);
3264 ext4_remove_li_request(elr);
3265 }
3266 mutex_unlock(&ext4_li_info->li_list_mtx);
3267}
3268
3269static int ext4_run_lazyinit_thread(void)
3270{
8f1f7453
ES		 3271 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3272 ext4_li_info, "ext4lazyinit");
3273 if (IS_ERR(ext4_lazyinit_task)) {
3274 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3275 ext4_clear_request_list();
bfff6873
LC		 3276 kfree(ext4_li_info);
3277 ext4_li_info = NULL;
92b97816 3278 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3279 "initialization thread\n",
3280 err);
3281 return err;
3282 }
3283 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3284 return 0;
3285}
3286
3287/*
3288 * Check whether it make sense to run itable init. thread or not.
3289 * If there is at least one uninitialized inode table, return
3290 * corresponding group number, else the loop goes through all
3291 * groups and return total number of groups.
3292 */
3293static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3294{
3295 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3296 struct ext4_group_desc *gdp = NULL;
3297
8844618d
TT		 3298 if (!ext4_has_group_desc_csum(sb))
3299 return ngroups;
3300
bfff6873
LC		 3301 for (group = 0; group < ngroups; group++) {
3302 gdp = ext4_get_group_desc(sb, group, NULL);
3303 if (!gdp)
3304 continue;
3305
50122847 3306 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3307 break;
3308 }
3309
3310 return group;
3311}
3312
3313static int ext4_li_info_new(void)
3314{
3315 struct ext4_lazy_init *eli = NULL;
3316
3317 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3318 if (!eli)
3319 return -ENOMEM;
3320
bfff6873
LC		 3321 INIT_LIST_HEAD(&eli->li_request_list);
3322 mutex_init(&eli->li_list_mtx);
3323
bfff6873
LC		 3324 eli->li_state |= EXT4_LAZYINIT_QUIT;
3325
3326 ext4_li_info = eli;
3327
3328 return 0;
3329}
3330
3331static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3332 ext4_group_t start)
3333{
3334 struct ext4_sb_info *sbi = EXT4_SB(sb);
3335 struct ext4_li_request *elr;
bfff6873
LC		 3336
3337 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3338 if (!elr)
3339 return NULL;
3340
3341 elr->lr_super = sb;
3342 elr->lr_sbi = sbi;
3343 elr->lr_next_group = start;
3344
3345 /*
3346 * Randomize first schedule time of the request to
3347 * spread the inode table initialization requests
3348 * better.
3349 */
dd1f723b
TT		 3350 elr->lr_next_sched = jiffies + (prandom_u32() %
3351 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3352 return elr;
3353}
3354
7f511862
TT		 3355int ext4_register_li_request(struct super_block *sb,
3356 ext4_group_t first_not_zeroed)
bfff6873
LC		 3357{
3358 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3359 struct ext4_li_request *elr = NULL;
49598e04 3360 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3361 int ret = 0;
bfff6873 3362
7f511862 3363 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3364 if (sbi->s_li_request != NULL) {
3365 /*
3366 * Reset timeout so it can be computed again, because
3367 * s_li_wait_mult might have changed.
3368 */
3369 sbi->s_li_request->lr_timeout = 0;
7f511862 3370 goto out;
51ce6511 3371 }
bfff6873 3372
bc98a42c 3373 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
55ff3840 3374 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3375 goto out;
bfff6873
LC		 3376
3377 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3378 if (!elr) {
3379 ret = -ENOMEM;
3380 goto out;
3381 }
bfff6873
LC		 3382
3383 if (NULL == ext4_li_info) {
3384 ret = ext4_li_info_new();
3385 if (ret)
3386 goto out;
3387 }
3388
3389 mutex_lock(&ext4_li_info->li_list_mtx);
3390 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3391 mutex_unlock(&ext4_li_info->li_list_mtx);
3392
3393 sbi->s_li_request = elr;
46e4690b
TM		 3394 /*
3395 * set elr to NULL here since it has been inserted to
3396 * the request_list and the removal and free of it is
3397 * handled by ext4_clear_request_list from now on.
3398 */
3399 elr = NULL;
bfff6873
LC		 3400
3401 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3402 ret = ext4_run_lazyinit_thread();
3403 if (ret)
3404 goto out;
3405 }
bfff6873 3406out:
beed5ecb
NK		 3407 mutex_unlock(&ext4_li_mtx);
3408 if (ret)
bfff6873 3409 kfree(elr);
bfff6873
LC		 3410 return ret;
3411}
3412
3413/*
3414 * We do not need to lock anything since this is called on
3415 * module unload.
3416 */
3417static void ext4_destroy_lazyinit_thread(void)
3418{
3419 /*
3420 * If thread exited earlier
3421 * there's nothing to be done.
3422 */
8f1f7453 3423 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3424 return;
3425
8f1f7453 3426 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3427}
3428
25ed6e8a
DW		 3429static int set_journal_csum_feature_set(struct super_block *sb)
3430{
3431 int ret = 1;
3432 int compat, incompat;
3433 struct ext4_sb_info *sbi = EXT4_SB(sb);
3434
9aa5d32b 3435 if (ext4_has_metadata_csum(sb)) {
db9ee220 3436 /* journal checksum v3 */
25ed6e8a 3437 compat = 0;
db9ee220 3438 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3439 } else {
3440 /* journal checksum v1 */
3441 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3442 incompat = 0;
3443 }
3444
feb8c6d3
DW		 3445 jbd2_journal_clear_features(sbi->s_journal,
3446 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3447 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3448 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3449 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3450 ret = jbd2_journal_set_features(sbi->s_journal,
3451 compat, 0,
3452 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3453 incompat);
3454 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3455 ret = jbd2_journal_set_features(sbi->s_journal,
3456 compat, 0,
3457 incompat);
3458 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3459 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3460 } else {
feb8c6d3
DW		 3461 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3462 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3463 }
3464
3465 return ret;
3466}
3467
952fc18e
TT		 3468/*
3469 * Note: calculating the overhead so we can be compatible with
3470 * historical BSD practice is quite difficult in the face of
3471 * clusters/bigalloc. This is because multiple metadata blocks from
3472 * different block group can end up in the same allocation cluster.
3473 * Calculating the exact overhead in the face of clustered allocation
3474 * requires either O(all block bitmaps) in memory or O(number of block
3475 * groups**2) in time. We will still calculate the superblock for
3476 * older file systems --- and if we come across with a bigalloc file
3477 * system with zero in s_overhead_clusters the estimate will be close to
3478 * correct especially for very large cluster sizes --- but for newer
3479 * file systems, it's better to calculate this figure once at mkfs
3480 * time, and store it in the superblock. If the superblock value is
3481 * present (even for non-bigalloc file systems), we will use it.
3482 */
3483static int count_overhead(struct super_block *sb, ext4_group_t grp,
3484 char *buf)
3485{
3486 struct ext4_sb_info *sbi = EXT4_SB(sb);
3487 struct ext4_group_desc *gdp;
3488 ext4_fsblk_t first_block, last_block, b;
3489 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3490 int s, j, count = 0;
3491
e2b911c5 3492 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3493 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3494 sbi->s_itb_per_group + 2);
3495
952fc18e
TT		 3496 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3497 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3498 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3499 for (i = 0; i < ngroups; i++) {
3500 gdp = ext4_get_group_desc(sb, i, NULL);
3501 b = ext4_block_bitmap(sb, gdp);
3502 if (b >= first_block && b <= last_block) {
3503 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3504 count++;
3505 }
3506 b = ext4_inode_bitmap(sb, gdp);
3507 if (b >= first_block && b <= last_block) {
3508 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3509 count++;
3510 }
3511 b = ext4_inode_table(sb, gdp);
3512 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3513 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3514 int c = EXT4_B2C(sbi, b - first_block);
3515 ext4_set_bit(c, buf);
3516 count++;
3517 }
3518 if (i != grp)
3519 continue;
3520 s = 0;
3521 if (ext4_bg_has_super(sb, grp)) {
3522 ext4_set_bit(s++, buf);
3523 count++;
3524 }
c48ae41b
TT		 3525 j = ext4_bg_num_gdb(sb, grp);
3526 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3527 ext4_error(sb, "Invalid number of block group "
3528 "descriptor blocks: %d", j);
3529 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3530 }
c48ae41b
TT		 3531 count += j;
3532 for (; j > 0; j--)
3533 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3534 }
3535 if (!count)
3536 return 0;
3537 return EXT4_CLUSTERS_PER_GROUP(sb) -
3538 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3539}
3540
3541/*
3542 * Compute the overhead and stash it in sbi->s_overhead
3543 */
3544int ext4_calculate_overhead(struct super_block *sb)
3545{
3546 struct ext4_sb_info *sbi = EXT4_SB(sb);
3547 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3548 struct inode *j_inode;
3549 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3550 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3551 ext4_fsblk_t overhead = 0;
4fdb5543 3552 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3553
952fc18e
TT		 3554 if (!buf)
3555 return -ENOMEM;
3556
3557 /*
3558 * Compute the overhead (FS structures). This is constant
3559 * for a given filesystem unless the number of block groups
3560 * changes so we cache the previous value until it does.
3561 */
3562
3563 /*
3564 * All of the blocks before first_data_block are overhead
3565 */
3566 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3567
3568 /*
3569 * Add the overhead found in each block group
3570 */
3571 for (i = 0; i < ngroups; i++) {
3572 int blks;
3573
3574 blks = count_overhead(sb, i, buf);
3575 overhead += blks;
3576 if (blks)
3577 memset(buf, 0, PAGE_SIZE);
3578 cond_resched();
3579 }
3c816ded
EW		 3580
3581 /*
3582 * Add the internal journal blocks whether the journal has been
3583 * loaded or not
3584 */
b003b524 3585 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3586 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3587 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3588 j_inode = ext4_get_journal_inode(sb, j_inum);
3589 if (j_inode) {
3590 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3591 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3592 iput(j_inode);
3593 } else {
3594 ext4_msg(sb, KERN_ERR, "can't get journal size");
3595 }
3596 }
952fc18e
TT		 3597 sbi->s_overhead = overhead;
3598 smp_wmb();
3599 free_page((unsigned long) buf);
3600 return 0;
3601}
3602
b5799018 3603static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3604{
3605 ext4_fsblk_t resv_clusters;
b5799018 3606 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3607
30fac0f7
JK		 3608 /*
3609 * There's no need to reserve anything when we aren't using extents.
3610 * The space estimates are exact, there are no unwritten extents,
3611 * hole punching doesn't need new metadata... This is needed especially
3612 * to keep ext2/3 backward compatibility.
3613 */
e2b911c5 3614 if (!ext4_has_feature_extents(sb))
b5799018 3615 return;
27dd4385
LC		 3616 /*
3617 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3618 * This should cover the situations where we can not afford to run
3619 * out of space like for example punch hole, or converting
556615dc 3620 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3621 * allocation would require 1, or 2 blocks, higher numbers are
3622 * very rare.
3623 */
b5799018
TT		 3624 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3625 sbi->s_cluster_bits);
27dd4385
LC		 3626
3627 do_div(resv_clusters, 50);
3628 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3629
b5799018 3630 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3631}
3632
2b2d6d01 3633static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3634{
5e405595 3635 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3636 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3637 struct buffer_head *bh;
617ba13b 3638 struct ext4_super_block *es = NULL;
5aee0f8a 3639 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3640 ext4_fsblk_t block;
3641 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3642 ext4_fsblk_t logical_sb_block;
ac27a0ec 3643 unsigned long offset = 0;
ac27a0ec
DK		 3644 unsigned long journal_devnum = 0;
3645 unsigned long def_mount_opts;
3646 struct inode *root;
0390131b 3647 const char *descr;
dcc7dae3 3648 int ret = -ENOMEM;
281b5995 3649 int blocksize, clustersize;
4ec11028
TT		 3650 unsigned int db_count;
3651 unsigned int i;
281b5995 3652 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3653 __u64 blocks_count;
07aa2ea1 3654 int err = 0;
b3881f74 3655 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3656 ext4_group_t first_not_zeroed;
ac27a0ec 3657
5aee0f8a
TT		 3658 if ((data && !orig_data) || !sbi)
3659 goto out_free_base;
705895b6 3660
aed9eb1b 3661 sbi->s_daxdev = dax_dev;
705895b6
PE		 3662 sbi->s_blockgroup_lock =
3663 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3664 if (!sbi->s_blockgroup_lock)
3665 goto out_free_base;
3666
ac27a0ec 3667 sb->s_fs_info = sbi;
2c0544b2 3668 sbi->s_sb = sb;
240799cd 3669 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3670 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3671 if (sb->s_bdev->bd_part)
3672 sbi->s_sectors_written_start =
dbae2c55 3673 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
ac27a0ec 3674
9f6200bb 3675 /* Cleanup superblock name */
ec3904dc 3676 strreplace(sb->s_id, '/', '!');
9f6200bb 3677
07aa2ea1 3678 /* -EINVAL is default */
dcc7dae3 3679 ret = -EINVAL;
617ba13b 3680 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3681 if (!blocksize) {
b31e1552 3682 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3683 goto out_fail;
3684 }
3685
3686 /*
617ba13b 3687 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3688 * block sizes. We need to calculate the offset from buffer start.
3689 */
617ba13b 3690 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3691 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3692 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3693 } else {
70bbb3e0 3694 logical_sb_block = sb_block;
ac27a0ec
DK		 3695 }
3696
a8ac900b 3697 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3698 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3699 goto out_fail;
3700 }
3701 /*
3702 * Note: s_es must be initialized as soon as possible because
617ba13b 3703 * some ext4 macro-instructions depend on its value
ac27a0ec 3704 */
2716b802 3705 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3706 sbi->s_es = es;
3707 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3708 if (sb->s_magic != EXT4_SUPER_MAGIC)
3709 goto cantfind_ext4;
afc32f7e 3710 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3711
feb0ab32 3712 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3713 if (ext4_has_feature_metadata_csum(sb) &&
3714 ext4_has_feature_gdt_csum(sb))
363307e6 3715 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3716 "redundant flags; please run fsck.");
3717
d25425f8
DW		 3718 /* Check for a known checksum algorithm */
3719 if (!ext4_verify_csum_type(sb, es)) {
3720 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3721 "unknown checksum algorithm.");
3722 silent = 1;
3723 goto cantfind_ext4;
3724 }
3725
0441984a 3726 /* Load the checksum driver */
a45403b5
TT		 3727 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3728 if (IS_ERR(sbi->s_chksum_driver)) {
3729 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3730 ret = PTR_ERR(sbi->s_chksum_driver);
3731 sbi->s_chksum_driver = NULL;
3732 goto failed_mount;
0441984a
DW		 3733 }
3734
a9c47317
DW		 3735 /* Check superblock checksum */
3736 if (!ext4_superblock_csum_verify(sb, es)) {
3737 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3738 "invalid superblock checksum. Run e2fsck?");
3739 silent = 1;
6a797d27 3740 ret = -EFSBADCRC;
a9c47317
DW		 3741 goto cantfind_ext4;
3742 }
3743
3744 /* Precompute checksum seed for all metadata */
e2b911c5 3745 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3746 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3747 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3748 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3749 sizeof(es->s_uuid));
3750
ac27a0ec
DK		 3751 /* Set defaults before we parse the mount options */
3752 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3753 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3754 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3755 set_opt(sb, DEBUG);
87f26807 3756 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3757 set_opt(sb, GRPID);
617ba13b 3758 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3759 set_opt(sb, NO_UID32);
ea663336 3760 /* xattr user namespace & acls are now defaulted on */
ea663336 3761 set_opt(sb, XATTR_USER);
244adf64 3762 set_opt(sb, DIOREAD_NOLOCK);
03010a33 3763#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3764 set_opt(sb, POSIX_ACL);
2e7842b8 3765#endif
98c1a759
DW		 3766 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3767 if (ext4_has_metadata_csum(sb))
3768 set_opt(sb, JOURNAL_CHECKSUM);
3769
617ba13b 3770 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3771 set_opt(sb, JOURNAL_DATA);
617ba13b 3772 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3773 set_opt(sb, ORDERED_DATA);
617ba13b 3774 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3775 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3776
3777 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3778 set_opt(sb, ERRORS_PANIC);
bb4f397a 3779 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3780 set_opt(sb, ERRORS_CONT);
bb4f397a 3781 else
fd8c37ec 3782 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3783 /* block_validity enabled by default; disable with noblock_validity */
3784 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3785 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3786 set_opt(sb, DISCARD);
ac27a0ec 3787
08cefc7a
EB		 3788 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3789 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3790 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3791 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3792 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3793
8b67f04a 3794 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3795 set_opt(sb, BARRIER);
ac27a0ec 3796
dd919b98
AK		 3797 /*
3798 * enable delayed allocation by default
3799 * Use -o nodelalloc to turn it off
3800 */
bc0b75f7 3801 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3802 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3803 set_opt(sb, DELALLOC);
dd919b98 3804
51ce6511
LC		 3805 /*
3806 * set default s_li_wait_mult for lazyinit, for the case there is
3807 * no mount option specified.
3808 */
3809 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3810
4f97a681
TT		 3811 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3812 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3813 blocksize > EXT4_MAX_BLOCK_SIZE) {
3814 ext4_msg(sb, KERN_ERR,
3815 "Unsupported filesystem blocksize %d (%d log_block_size)",
3816 blocksize, le32_to_cpu(es->s_log_block_size));
3817 goto failed_mount;
3818 }
3819
9803387c
TT		 3820 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3821 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3822 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3823 } else {
3824 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3825 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3826 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3827 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3828 sbi->s_first_ino);
3829 goto failed_mount;
3830 }
3831 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3832 (!is_power_of_2(sbi->s_inode_size)) ||
3833 (sbi->s_inode_size > blocksize)) {
3834 ext4_msg(sb, KERN_ERR,
3835 "unsupported inode size: %d",
3836 sbi->s_inode_size);
4f97a681 3837 ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
9803387c
TT		 3838 goto failed_mount;
3839 }
3840 /*
3841 * i_atime_extra is the last extra field available for
3842 * [acm]times in struct ext4_inode. Checking for that
3843 * field should suffice to ensure we have extra space
3844 * for all three.
3845 */
3846 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
3847 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
3848 sb->s_time_gran = 1;
3849 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
3850 } else {
3851 sb->s_time_gran = NSEC_PER_SEC;
3852 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
3853 }
3854 sb->s_time_min = EXT4_TIMESTAMP_MIN;
3855 }
3856 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3857 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3858 EXT4_GOOD_OLD_INODE_SIZE;
3859 if (ext4_has_feature_extra_isize(sb)) {
3860 unsigned v, max = (sbi->s_inode_size -
3861 EXT4_GOOD_OLD_INODE_SIZE);
3862
3863 v = le16_to_cpu(es->s_want_extra_isize);
3864 if (v > max) {
3865 ext4_msg(sb, KERN_ERR,
3866 "bad s_want_extra_isize: %d", v);
3867 goto failed_mount;
3868 }
3869 if (sbi->s_want_extra_isize < v)
3870 sbi->s_want_extra_isize = v;
3871
3872 v = le16_to_cpu(es->s_min_extra_isize);
3873 if (v > max) {
3874 ext4_msg(sb, KERN_ERR,
3875 "bad s_min_extra_isize: %d", v);
3876 goto failed_mount;
3877 }
3878 if (sbi->s_want_extra_isize < v)
3879 sbi->s_want_extra_isize = v;
3880 }
3881 }
3882
5aee0f8a
TT		 3883 if (sbi->s_es->s_mount_opts[0]) {
3884 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3885 sizeof(sbi->s_es->s_mount_opts),
3886 GFP_KERNEL);
3887 if (!s_mount_opts)
3888 goto failed_mount;
3889 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3890 &journal_ioprio, 0)) {
3891 ext4_msg(sb, KERN_WARNING,
3892 "failed to parse options in superblock: %s",
3893 s_mount_opts);
3894 }
3895 kfree(s_mount_opts);
8b67f04a 3896 }
5a916be1 3897 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3898 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3899 &journal_ioprio, 0))
ac27a0ec
DK		 3900 goto failed_mount;
3901
c83ad55e
GKB		 3902#ifdef CONFIG_UNICODE
3903 if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
3904 const struct ext4_sb_encodings *encoding_info;
3905 struct unicode_map *encoding;
3906 __u16 encoding_flags;
3907
3908 if (ext4_has_feature_encrypt(sb)) {
3909 ext4_msg(sb, KERN_ERR,
3910 "Can't mount with encoding and encryption");
3911 goto failed_mount;
3912 }
3913
3914 if (ext4_sb_read_encoding(es, &encoding_info,
3915 &encoding_flags)) {
3916 ext4_msg(sb, KERN_ERR,
3917 "Encoding requested by superblock is unknown");
3918 goto failed_mount;
3919 }
3920
3921 encoding = utf8_load(encoding_info->version);
3922 if (IS_ERR(encoding)) {
3923 ext4_msg(sb, KERN_ERR,
3924 "can't mount with superblock charset: %s-%s "
3925 "not supported by the kernel. flags: 0x%x.",
3926 encoding_info->name, encoding_info->version,
3927 encoding_flags);
3928 goto failed_mount;
3929 }
3930 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
3931 "%s-%s with flags 0x%hx", encoding_info->name,
3932 encoding_info->version?:"\b", encoding_flags);
3933
3934 sbi->s_encoding = encoding;
3935 sbi->s_encoding_flags = encoding_flags;
3936 }
3937#endif
3938
56889787 3939 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
244adf64
TT		 3940 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, and O_DIRECT support!\n");
3941 clear_opt(sb, DIOREAD_NOLOCK);
56889787
TT		 3942 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3943 ext4_msg(sb, KERN_ERR, "can't mount with "
3944 "both data=journal and delalloc");
3945 goto failed_mount;
3946 }
3947 if (test_opt(sb, DIOREAD_NOLOCK)) {
3948 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3949 "both data=journal and dioread_nolock");
56889787
TT		 3950 goto failed_mount;
3951 }
923ae0ff
RZ		 3952 if (test_opt(sb, DAX)) {
3953 ext4_msg(sb, KERN_ERR, "can't mount with "
3954 "both data=journal and dax");
3955 goto failed_mount;
3956 }
73b92a2a
SK		 3957 if (ext4_has_feature_encrypt(sb)) {
3958 ext4_msg(sb, KERN_WARNING,
3959 "encrypted files will use data=ordered "
3960 "instead of data journaling mode");
3961 }
56889787
TT		 3962 if (test_opt(sb, DELALLOC))
3963 clear_opt(sb, DELALLOC);
001e4a87
TH		 3964 } else {
3965 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3966 }
3967
1751e8a6
LT		 3968 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3969 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 3970
617ba13b 3971 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3972 (ext4_has_compat_features(sb) ||
3973 ext4_has_ro_compat_features(sb) ||
3974 ext4_has_incompat_features(sb)))
b31e1552
ES		 3975 ext4_msg(sb, KERN_WARNING,
3976 "feature flags set on rev 0 fs, "
3977 "running e2fsck is recommended");
469108ff 3978
ed3654eb
TT		 3979 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3980 set_opt2(sb, HURD_COMPAT);
e2b911c5 3981 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3982 ext4_msg(sb, KERN_ERR,
3983 "The Hurd can't support 64-bit file systems");
3984 goto failed_mount;
3985 }
dec214d0
TE		 3986
3987 /*
3988 * ea_inode feature uses l_i_version field which is not
3989 * available in HURD_COMPAT mode.
3990 */
3991 if (ext4_has_feature_ea_inode(sb)) {
3992 ext4_msg(sb, KERN_ERR,
3993 "ea_inode feature is not supported for Hurd");
3994 goto failed_mount;
3995 }
ed3654eb
TT		 3996 }
3997
2035e776
TT		 3998 if (IS_EXT2_SB(sb)) {
3999 if (ext2_feature_set_ok(sb))
4000 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4001 "using the ext4 subsystem");
4002 else {
0d9366d6
ES		 4003 /*
4004 * If we're probing be silent, if this looks like
4005 * it's actually an ext[34] filesystem.
4006 */
4007 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4008 goto failed_mount;
2035e776
TT		 4009 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4010 "to feature incompatibilities");
4011 goto failed_mount;
4012 }
4013 }
4014
4015 if (IS_EXT3_SB(sb)) {
4016 if (ext3_feature_set_ok(sb))
4017 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4018 "using the ext4 subsystem");
4019 else {
0d9366d6
ES		 4020 /*
4021 * If we're probing be silent, if this looks like
4022 * it's actually an ext4 filesystem.
4023 */
4024 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4025 goto failed_mount;
2035e776
TT		 4026 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4027 "to feature incompatibilities");
4028 goto failed_mount;
4029 }
4030 }
4031
ac27a0ec
DK		 4032 /*
4033 * Check feature flags regardless of the revision level, since we
4034 * previously didn't change the revision level when setting the flags,
4035 * so there is a chance incompat flags are set on a rev 0 filesystem.
4036 */
bc98a42c 4037 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 4038 goto failed_mount;
a13fb1a4 4039
8cdf3372
TT		 4040 if (le32_to_cpu(es->s_log_block_size) >
4041 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4042 ext4_msg(sb, KERN_ERR,
4043 "Invalid log block size: %u",
4044 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 4045 goto failed_mount;
4046 }
bfe0a5f4
TT		 4047 if (le32_to_cpu(es->s_log_cluster_size) >
4048 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4049 ext4_msg(sb, KERN_ERR,
4050 "Invalid log cluster size: %u",
4051 le32_to_cpu(es->s_log_cluster_size));
4052 goto failed_mount;
4053 }
ac27a0ec 4054
5b9554dc
TT		 4055 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4056 ext4_msg(sb, KERN_ERR,
4057 "Number of reserved GDT blocks insanely large: %d",
4058 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4059 goto failed_mount;
4060 }
4061
923ae0ff 4062 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
559db4c6
RZ		 4063 if (ext4_has_feature_inline_data(sb)) {
4064 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4065 " that may contain inline data");
361d24d4 4066 goto failed_mount;
559db4c6 4067 }
80660f20 4068 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
24f3478d 4069 ext4_msg(sb, KERN_ERR,
361d24d4
ES		 4070 "DAX unsupported by block device.");
4071 goto failed_mount;
24f3478d 4072 }
923ae0ff
RZ		 4073 }
4074
e2b911c5 4075 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 4076 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4077 es->s_encryption_level);
4078 goto failed_mount;
4079 }
4080
ac27a0ec 4081 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 4082 /* Validate the filesystem blocksize */
4083 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 4084 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 4085 blocksize);
ac27a0ec
DK		 4086 goto failed_mount;
4087 }
4088
2b2d6d01 4089 brelse(bh);
70bbb3e0
AM		 4090 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4091 offset = do_div(logical_sb_block, blocksize);
a8ac900b 4092 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 4093 if (!bh) {
b31e1552
ES		 4094 ext4_msg(sb, KERN_ERR,
4095 "Can't read superblock on 2nd try");
ac27a0ec
DK		 4096 goto failed_mount;
4097 }
2716b802 4098 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 4099 sbi->s_es = es;
617ba13b 4100 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 4101 ext4_msg(sb, KERN_ERR,
4102 "Magic mismatch, very weird!");
ac27a0ec
DK		 4103 goto failed_mount;
4104 }
4105 }
4106
e2b911c5 4107 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 4108 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4109 has_huge_files);
4110 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 4111
0d1ee42f 4112 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 4113 if (ext4_has_feature_64bit(sb)) {
8fadc143 4114 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 4115 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 4116 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 4117 ext4_msg(sb, KERN_ERR,
4118 "unsupported descriptor size %lu",
0d1ee42f
AR		 4119 sbi->s_desc_size);
4120 goto failed_mount;
4121 }
4122 } else
4123 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 4124
ac27a0ec 4125 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 4126 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 4127
617ba13b 4128 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 4129 if (sbi->s_inodes_per_block == 0)
617ba13b 4130 goto cantfind_ext4;
cd6bb35b
TT		 4131 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4132 sbi->s_inodes_per_group > blocksize * 8) {
4133 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4134 sbi->s_blocks_per_group);
4135 goto failed_mount;
4136 }
ac27a0ec
DK		 4137 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4138 sbi->s_inodes_per_block;
0d1ee42f 4139 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 4140 sbi->s_sbh = bh;
4141 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 4142 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4143 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 4144
2b2d6d01 4145 for (i = 0; i < 4; i++)
ac27a0ec
DK		 4146 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4147 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 4148 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 4149 i = le32_to_cpu(es->s_flags);
4150 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4151 sbi->s_hash_unsigned = 3;
4152 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 4153#ifdef __CHAR_UNSIGNED__
bc98a42c 4154 if (!sb_rdonly(sb))
23301410
TT		 4155 es->s_flags |=
4156 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4157 sbi->s_hash_unsigned = 3;
f99b2589 4158#else
bc98a42c 4159 if (!sb_rdonly(sb))
23301410
TT		 4160 es->s_flags |=
4161 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 4162#endif
23301410 4163 }
f99b2589 4164 }
ac27a0ec 4165
281b5995
TT		 4166 /* Handle clustersize */
4167 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 4168 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 4169 if (has_bigalloc) {
4170 if (clustersize < blocksize) {
4171 ext4_msg(sb, KERN_ERR,
4172 "cluster size (%d) smaller than "
4173 "block size (%d)", clustersize, blocksize);
4174 goto failed_mount;
4175 }
4176 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4177 le32_to_cpu(es->s_log_block_size);
4178 sbi->s_clusters_per_group =
4179 le32_to_cpu(es->s_clusters_per_group);
4180 if (sbi->s_clusters_per_group > blocksize * 8) {
4181 ext4_msg(sb, KERN_ERR,
4182 "#clusters per group too big: %lu",
4183 sbi->s_clusters_per_group);
4184 goto failed_mount;
4185 }
4186 if (sbi->s_blocks_per_group !=
4187 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4188 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4189 "clusters per group (%lu) inconsistent",
4190 sbi->s_blocks_per_group,
4191 sbi->s_clusters_per_group);
4192 goto failed_mount;
4193 }
4194 } else {
4195 if (clustersize != blocksize) {
bfe0a5f4
TT		 4196 ext4_msg(sb, KERN_ERR,
4197 "fragment/cluster size (%d) != "
4198 "block size (%d)", clustersize, blocksize);
4199 goto failed_mount;
281b5995
TT		 4200 }
4201 if (sbi->s_blocks_per_group > blocksize * 8) {
4202 ext4_msg(sb, KERN_ERR,
4203 "#blocks per group too big: %lu",
4204 sbi->s_blocks_per_group);
4205 goto failed_mount;
4206 }
4207 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4208 sbi->s_cluster_bits = 0;
ac27a0ec 4209 }
281b5995
TT		 4210 sbi->s_cluster_ratio = clustersize / blocksize;
4211
960fd856
TT		 4212 /* Do we have standard group size of clustersize * 8 blocks ? */
4213 if (sbi->s_blocks_per_group == clustersize << 3)
4214 set_opt2(sb, STD_GROUP_SIZE);
4215
bf43d84b
ES		 4216 /*
4217 * Test whether we have more sectors than will fit in sector_t,
4218 * and whether the max offset is addressable by the page cache.
4219 */
5a9ae68a 4220 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 4221 ext4_blocks_count(es));
5a9ae68a 4222 if (err) {
b31e1552 4223 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 4224 " too large to mount safely on this system");
ac27a0ec
DK		 4225 goto failed_mount;
4226 }
4227
617ba13b
MC		 4228 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4229 goto cantfind_ext4;
e7c95593 4230
0f2ddca6
FTN		 4231 /* check blocks count against device size */
4232 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4233 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 4234 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4235 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 4236 ext4_blocks_count(es), blocks_count);
4237 goto failed_mount;
4238 }
4239
0b8e58a1
AD		 4240 /*
4241 * It makes no sense for the first data block to be beyond the end
4242 * of the filesystem.
4243 */
4244 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 4245 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 4246 "block %u is beyond end of filesystem (%llu)",
4247 le32_to_cpu(es->s_first_data_block),
4248 ext4_blocks_count(es));
e7c95593
ES		 4249 goto failed_mount;
4250 }
bfe0a5f4
TT		 4251 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4252 (sbi->s_cluster_ratio == 1)) {
4253 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4254 "block is 0 with a 1k block and cluster size");
4255 goto failed_mount;
4256 }
4257
bd81d8ee
LV		 4258 blocks_count = (ext4_blocks_count(es) -
4259 le32_to_cpu(es->s_first_data_block) +
4260 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4261 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 4262 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 4263 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 4264 "(block count %llu, first data block %u, "
b31e1552 4265 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 4266 ext4_blocks_count(es),
4267 le32_to_cpu(es->s_first_data_block),
4268 EXT4_BLOCKS_PER_GROUP(sb));
4269 goto failed_mount;
4270 }
bd81d8ee 4271 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 4272 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4273 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
9e463084
TT		 4274 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4275 le32_to_cpu(es->s_inodes_count)) {
4276 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4277 le32_to_cpu(es->s_inodes_count),
4278 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4279 ret = -EINVAL;
4280 goto failed_mount;
4281 }
617ba13b
MC		 4282 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4283 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 4284 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 4285 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 4286 ext4_msg(sb, KERN_WARNING,
4287 "first meta block group too large: %u "
4288 "(group descriptor block count %u)",
4289 le32_to_cpu(es->s_first_meta_bg), db_count);
4290 goto failed_mount;
4291 }
4292 }
344476e1
KC		 4293 sbi->s_group_desc = kvmalloc_array(db_count,
4294 sizeof(struct buffer_head *),
4295 GFP_KERNEL);
ac27a0ec 4296 if (sbi->s_group_desc == NULL) {
b31e1552 4297 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4298 ret = -ENOMEM;
ac27a0ec
DK		 4299 goto failed_mount;
4300 }
4301
705895b6 4302 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4303
85c8f176
AP		 4304 /* Pre-read the descriptors into the buffer cache */
4305 for (i = 0; i < db_count; i++) {
4306 block = descriptor_loc(sb, logical_sb_block, i);
4307 sb_breadahead(sb, block);
4308 }
4309
ac27a0ec 4310 for (i = 0; i < db_count; i++) {
70bbb3e0 4311 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 4312 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 4313 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 4314 ext4_msg(sb, KERN_ERR,
4315 "can't read group descriptor %d", i);
ac27a0ec
DK		 4316 db_count = i;
4317 goto failed_mount2;
4318 }
4319 }
44de022c 4320 sbi->s_gdb_count = db_count;
829fa70d 4321 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4322 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4323 ret = -EFSCORRUPTED;
f9ae9cf5 4324 goto failed_mount2;
ac27a0ec 4325 }
772cb7c8 4326
235699a8 4327 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 4328
a75ae78f 4329 /* Register extent status tree shrinker */
eb68d0e2 4330 if (ext4_es_register_shrinker(sbi))
ce7e010a 4331 goto failed_mount3;
ce7e010a 4332
c9de560d 4333 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4334 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4335
f9ae9cf5
TT		 4336 /*
4337 * set up enough so that it can read an inode
4338 */
f6e63f90 4339 sb->s_op = &ext4_sops;
617ba13b
MC		 4340 sb->s_export_op = &ext4_export_ops;
4341 sb->s_xattr = ext4_xattr_handlers;
643fa961 4342#ifdef CONFIG_FS_ENCRYPTION
a7550b30 4343 sb->s_cop = &ext4_cryptops;
ffcc4182 4344#endif
c93d8f88
EB		 4345#ifdef CONFIG_FS_VERITY
4346 sb->s_vop = &ext4_verityops;
4347#endif
ac27a0ec 4348#ifdef CONFIG_QUOTA
617ba13b 4349 sb->dq_op = &ext4_quota_operations;
e2b911c5 4350 if (ext4_has_feature_quota(sb))
1fa5efe3 4351 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4352 else
4353 sb->s_qcop = &ext4_qctl_operations;
689c958c 4354 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4355#endif
85787090 4356 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4357
ac27a0ec 4358 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4359 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4360
4361 sb->s_root = NULL;
4362
4363 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4364 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4365
bc98a42c 4366 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4367 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4368 goto failed_mount3a;
c5e06d10 4369
ac27a0ec
DK		 4370 /*
4371 * The first inode we look at is the journal inode. Don't try
4372 * root first: it may be modified in the journal!
4373 */
e2b911c5 4374 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4375 err = ext4_load_journal(sb, es, journal_devnum);
4376 if (err)
50460fe8 4377 goto failed_mount3a;
bc98a42c 4378 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4379 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4380 ext4_msg(sb, KERN_ERR, "required journal recovery "
4381 "suppressed and not mounted read-only");
744692dc 4382 goto failed_mount_wq;
ac27a0ec 4383 } else {
1e381f60
DM		 4384 /* Nojournal mode, all journal mount options are illegal */
4385 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4386 ext4_msg(sb, KERN_ERR, "can't mount with "
4387 "journal_checksum, fs mounted w/o journal");
4388 goto failed_mount_wq;
4389 }
4390 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4391 ext4_msg(sb, KERN_ERR, "can't mount with "
4392 "journal_async_commit, fs mounted w/o journal");
4393 goto failed_mount_wq;
4394 }
4395 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4396 ext4_msg(sb, KERN_ERR, "can't mount with "
4397 "commit=%lu, fs mounted w/o journal",
4398 sbi->s_commit_interval / HZ);
4399 goto failed_mount_wq;
4400 }
4401 if (EXT4_MOUNT_DATA_FLAGS &
4402 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4403 ext4_msg(sb, KERN_ERR, "can't mount with "
4404 "data=, fs mounted w/o journal");
4405 goto failed_mount_wq;
4406 }
50b29d8f 4407 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
1e381f60 4408 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4409 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4410 sbi->s_journal = NULL;
4411 needs_recovery = 0;
4412 goto no_journal;
ac27a0ec
DK		 4413 }
4414
e2b911c5 4415 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4416 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4417 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4418 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4419 goto failed_mount_wq;
eb40a09c
JS		 4420 }
4421
25ed6e8a
DW		 4422 if (!set_journal_csum_feature_set(sb)) {
4423 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4424 "feature set");
4425 goto failed_mount_wq;
d4da6c9c 4426 }
818d276c 4427
ac27a0ec
DK		 4428 /* We have now updated the journal if required, so we can
4429 * validate the data journaling mode. */
4430 switch (test_opt(sb, DATA_FLAGS)) {
4431 case 0:
4432 /* No mode set, assume a default based on the journal
63f57933
AM		 4433 * capabilities: ORDERED_DATA if the journal can
4434 * cope, else JOURNAL_DATA
4435 */
dab291af 4436 if (jbd2_journal_check_available_features
27f394a7 4437 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
fd8c37ec 4438 set_opt(sb, ORDERED_DATA);
27f394a7
TN		 4439 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4440 } else {
fd8c37ec 4441 set_opt(sb, JOURNAL_DATA);
27f394a7
TN		 4442 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4443 }
ac27a0ec
DK		 4444 break;
4445
617ba13b
MC		 4446 case EXT4_MOUNT_ORDERED_DATA:
4447 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4448 if (!jbd2_journal_check_available_features
4449 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4450 ext4_msg(sb, KERN_ERR, "Journal does not support "
4451 "requested data journaling mode");
744692dc 4452 goto failed_mount_wq;
ac27a0ec
DK		 4453 }
4454 default:
4455 break;
4456 }
ab04df78
JK		 4457
4458 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4459 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4460 ext4_msg(sb, KERN_ERR, "can't mount with "
4461 "journal_async_commit in data=ordered mode");
4462 goto failed_mount_wq;
4463 }
4464
b3881f74 4465 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4466
18aadd47
BJ		 4467 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4468
ce7e010a 4469no_journal:
cdb7ee4c
TE		 4470 if (!test_opt(sb, NO_MBCACHE)) {
4471 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4472 if (!sbi->s_ea_block_cache) {
dec214d0 4473 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4474 "Failed to create ea_block_cache");
dec214d0
TE		 4475 goto failed_mount_wq;
4476 }
cdb7ee4c
TE		 4477
4478 if (ext4_has_feature_ea_inode(sb)) {
4479 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4480 if (!sbi->s_ea_inode_cache) {
4481 ext4_msg(sb, KERN_ERR,
4482 "Failed to create ea_inode_cache");
4483 goto failed_mount_wq;
4484 }
4485 }
9c191f70
M		 4486 }
4487
c93d8f88
EB		 4488 if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4489 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4490 goto failed_mount_wq;
4491 }
4492
bc98a42c 4493 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4494 !ext4_has_feature_encrypt(sb)) {
4495 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4496 ext4_commit_super(sb, 1);
4497 }
4498
952fc18e
TT		 4499 /*
4500 * Get the # of file system overhead blocks from the
4501 * superblock if present.
4502 */
4503 if (es->s_overhead_clusters)
4504 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4505 else {
07aa2ea1
LC		 4506 err = ext4_calculate_overhead(sb);
4507 if (err)
952fc18e
TT		 4508 goto failed_mount_wq;
4509 }
4510
fd89d5f2
TH		 4511 /*
4512 * The maximum number of concurrent works can be high and
4513 * concurrency isn't really necessary. Limit it to 1.
4514 */
2e8fa54e
JK		 4515 EXT4_SB(sb)->rsv_conversion_wq =
4516 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4517 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4518 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4519 ret = -ENOMEM;
2e8fa54e
JK		 4520 goto failed_mount4;
4521 }
4522
ac27a0ec 4523 /*
dab291af 4524 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4525 * so we can safely mount the rest of the filesystem now.
4526 */
4527
8a363970 4528 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 4529 if (IS_ERR(root)) {
b31e1552 4530 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4531 ret = PTR_ERR(root);
32a9bb57 4532 root = NULL;
ac27a0ec
DK		 4533 goto failed_mount4;
4534 }
4535 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4536 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4537 iput(root);
ac27a0ec
DK		 4538 goto failed_mount4;
4539 }
b886ee3e
GKB		 4540
4541#ifdef CONFIG_UNICODE
4542 if (sbi->s_encoding)
4543 sb->s_d_op = &ext4_dentry_ops;
4544#endif
4545
48fde701 4546 sb->s_root = d_make_root(root);
1d1fe1ee 4547 if (!sb->s_root) {
b31e1552 4548 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4549 ret = -ENOMEM;
4550 goto failed_mount4;
4551 }
ac27a0ec 4552
c89128a0
JK		 4553 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4554 if (ret == -EROFS) {
1751e8a6 4555 sb->s_flags |= SB_RDONLY;
c89128a0
JK		 4556 ret = 0;
4557 } else if (ret)
4558 goto failed_mount4a;
ef7f3835 4559
b5799018 4560 ext4_set_resv_clusters(sb);
27dd4385 4561
6fd058f7
TT		 4562 err = ext4_setup_system_zone(sb);
4563 if (err) {
b31e1552 4564 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4565 "zone (%d)", err);
f9ae9cf5
TT		 4566 goto failed_mount4a;
4567 }
4568
4569 ext4_ext_init(sb);
4570 err = ext4_mb_init(sb);
4571 if (err) {
4572 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4573 err);
dcf2d804 4574 goto failed_mount5;
c2774d84
AK		 4575 }
4576
d5e03cbb
TT		 4577 block = ext4_count_free_clusters(sb);
4578 ext4_free_blocks_count_set(sbi->s_es,
4579 EXT4_C2B(sbi, block));
4274f516 4580 ext4_superblock_csum_set(sb);
908c7f19
TH		 4581 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4582 GFP_KERNEL);
d5e03cbb
TT		 4583 if (!err) {
4584 unsigned long freei = ext4_count_free_inodes(sb);
4585 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4274f516 4586 ext4_superblock_csum_set(sb);
908c7f19
TH		 4587 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4588 GFP_KERNEL);
d5e03cbb
TT		 4589 }
4590 if (!err)
4591 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4592 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4593 if (!err)
908c7f19
TH		 4594 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4595 GFP_KERNEL);
c8585c6f
DJ		 4596 if (!err)
4597 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4598
d5e03cbb
TT		 4599 if (err) {
4600 ext4_msg(sb, KERN_ERR, "insufficient memory");
4601 goto failed_mount6;
4602 }
4603
e2b911c5 4604 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4605 if (!ext4_fill_flex_info(sb)) {
4606 ext4_msg(sb, KERN_ERR,
4607 "unable to initialize "
4608 "flex_bg meta info!");
4609 goto failed_mount6;
4610 }
4611
bfff6873
LC		 4612 err = ext4_register_li_request(sb, first_not_zeroed);
4613 if (err)
dcf2d804 4614 goto failed_mount6;
bfff6873 4615
b5799018 4616 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4617 if (err)
4618 goto failed_mount7;
3197ebdb 4619
9b2ff357
JK		 4620#ifdef CONFIG_QUOTA
4621 /* Enable quota usage during mount. */
bc98a42c 4622 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4623 err = ext4_enable_quotas(sb);
4624 if (err)
4625 goto failed_mount8;
4626 }
4627#endif /* CONFIG_QUOTA */
4628
617ba13b
MC		 4629 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4630 ext4_orphan_cleanup(sb, es);
4631 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4632 if (needs_recovery) {
b31e1552 4633 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4634 ext4_mark_recovery_complete(sb, es);
4635 }
4636 if (EXT4_SB(sb)->s_journal) {
4637 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4638 descr = " journalled data mode";
4639 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4640 descr = " ordered data mode";
4641 else
4642 descr = " writeback data mode";
4643 } else
4644 descr = "out journal";
4645
79add3a3
LC		 4646 if (test_opt(sb, DISCARD)) {
4647 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4648 if (!blk_queue_discard(q))
4649 ext4_msg(sb, KERN_WARNING,
4650 "mounting with \"discard\" option, but "
4651 "the device does not support discard");
4652 }
4653
e294a537
TT		 4654 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4655 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4656 "Opts: %.*s%s%s", descr,
4657 (int) sizeof(sbi->s_es->s_mount_opts),
4658 sbi->s_es->s_mount_opts,
e294a537 4659 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4660
66e61a9e
TT		 4661 if (es->s_error_count)
4662 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4663
efbed4dc
TT		 4664 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4665 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4666 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4667 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4668
d4c402d9 4669 kfree(orig_data);
ac27a0ec
DK		 4670 return 0;
4671
617ba13b 4672cantfind_ext4:
ac27a0ec 4673 if (!silent)
b31e1552 4674 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4675 goto failed_mount;
4676
72ba7450
TT		 4677#ifdef CONFIG_QUOTA
4678failed_mount8:
ebd173be 4679 ext4_unregister_sysfs(sb);
72ba7450 4680#endif
dcf2d804
TM		 4681failed_mount7:
4682 ext4_unregister_li_request(sb);
4683failed_mount6:
f9ae9cf5 4684 ext4_mb_release(sb);
d5e03cbb 4685 if (sbi->s_flex_groups)
b93b41d4 4686 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4687 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4688 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4689 percpu_counter_destroy(&sbi->s_dirs_counter);
4690 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
af18e35b 4691 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
00764937 4692failed_mount5:
f9ae9cf5
TT		 4693 ext4_ext_release(sb);
4694 ext4_release_system_zone(sb);
4695failed_mount4a:
94bf608a 4696 dput(sb->s_root);
32a9bb57 4697 sb->s_root = NULL;
94bf608a 4698failed_mount4:
b31e1552 4699 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4700 if (EXT4_SB(sb)->rsv_conversion_wq)
4701 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4702failed_mount_wq:
50c15df6
CX		 4703 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4704 sbi->s_ea_inode_cache = NULL;
4705
4706 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4707 sbi->s_ea_block_cache = NULL;
4708
0390131b
FM		 4709 if (sbi->s_journal) {
4710 jbd2_journal_destroy(sbi->s_journal);
4711 sbi->s_journal = NULL;
4712 }
50460fe8 4713failed_mount3a:
d3922a77 4714 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4715failed_mount3:
9105bb14 4716 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4717 if (sbi->s_mmp_tsk)
4718 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4719failed_mount2:
4720 for (i = 0; i < db_count; i++)
4721 brelse(sbi->s_group_desc[i]);
b93b41d4 4722 kvfree(sbi->s_group_desc);
ac27a0ec 4723failed_mount:
0441984a
DW		 4724 if (sbi->s_chksum_driver)
4725 crypto_free_shash(sbi->s_chksum_driver);
c83ad55e
GKB		 4726
4727#ifdef CONFIG_UNICODE
4728 utf8_unload(sbi->s_encoding);
4729#endif
4730
ac27a0ec 4731#ifdef CONFIG_QUOTA
a2d4a646 4732 for (i = 0; i < EXT4_MAXQUOTAS; i++)
0ba33fac 4733 kfree(get_qf_name(sb, sbi, i));
ac27a0ec 4734#endif
617ba13b 4735 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4736 brelse(bh);
4737out_fail:
4738 sb->s_fs_info = NULL;
f6830165 4739 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4740out_free_base:
ac27a0ec 4741 kfree(sbi);
d4c402d9 4742 kfree(orig_data);
5e405595 4743 fs_put_dax(dax_dev);
07aa2ea1 4744 return err ? err : ret;
ac27a0ec
DK		 4745}
4746
4747/*
4748 * Setup any per-fs journal parameters now. We'll do this both on
4749 * initial mount, once the journal has been initialised but before we've
4750 * done any recovery; and again on any subsequent remount.
4751 */
617ba13b 4752static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4753{
617ba13b 4754 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4755
30773840
TT		 4756 journal->j_commit_interval = sbi->s_commit_interval;
4757 journal->j_min_batch_time = sbi->s_min_batch_time;
4758 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4759
a931da6a 4760 write_lock(&journal->j_state_lock);
ac27a0ec 4761 if (test_opt(sb, BARRIER))
dab291af 4762 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4763 else
dab291af 4764 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4765 if (test_opt(sb, DATA_ERR_ABORT))
4766 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4767 else
4768 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4769 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4770}
4771
c6cb7e77
EW		 4772static struct inode *ext4_get_journal_inode(struct super_block *sb,
4773 unsigned int journal_inum)
ac27a0ec
DK		 4774{
4775 struct inode *journal_inode;
ac27a0ec 4776
c6cb7e77
EW		 4777 /*
4778 * Test for the existence of a valid inode on disk. Bad things
4779 * happen if we iget() an unused inode, as the subsequent iput()
4780 * will try to delete it.
4781 */
8a363970 4782 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 4783 if (IS_ERR(journal_inode)) {
b31e1552 4784 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4785 return NULL;
4786 }
4787 if (!journal_inode->i_nlink) {
4788 make_bad_inode(journal_inode);
4789 iput(journal_inode);
b31e1552 4790 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4791 return NULL;
4792 }
4793
e5f8eab8 4794 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4795 journal_inode, journal_inode->i_size);
1d1fe1ee 4796 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4797 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4798 iput(journal_inode);
4799 return NULL;
4800 }
c6cb7e77
EW		 4801 return journal_inode;
4802}
4803
4804static journal_t *ext4_get_journal(struct super_block *sb,
4805 unsigned int journal_inum)
4806{
4807 struct inode *journal_inode;
4808 journal_t *journal;
4809
4810 BUG_ON(!ext4_has_feature_journal(sb));
4811
4812 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4813 if (!journal_inode)
4814 return NULL;
ac27a0ec 4815
dab291af 4816 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4817 if (!journal) {
b31e1552 4818 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4819 iput(journal_inode);
4820 return NULL;
4821 }
4822 journal->j_private = sb;
617ba13b 4823 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4824 return journal;
4825}
4826
617ba13b 4827static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4828 dev_t j_dev)
4829{
2b2d6d01 4830 struct buffer_head *bh;
ac27a0ec 4831 journal_t *journal;
617ba13b
MC		 4832 ext4_fsblk_t start;
4833 ext4_fsblk_t len;
ac27a0ec 4834 int hblock, blocksize;
617ba13b 4835 ext4_fsblk_t sb_block;
ac27a0ec 4836 unsigned long offset;
2b2d6d01 4837 struct ext4_super_block *es;
ac27a0ec
DK		 4838 struct block_device *bdev;
4839
e2b911c5 4840 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4841
b31e1552 4842 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4843 if (bdev == NULL)
4844 return NULL;
4845
ac27a0ec 4846 blocksize = sb->s_blocksize;
e1defc4f 4847 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4848 if (blocksize < hblock) {
b31e1552
ES		 4849 ext4_msg(sb, KERN_ERR,
4850 "blocksize too small for journal device");
ac27a0ec
DK		 4851 goto out_bdev;
4852 }
4853
617ba13b
MC		 4854 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4855 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4856 set_blocksize(bdev, blocksize);
4857 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4858 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4859 "external journal");
ac27a0ec
DK		 4860 goto out_bdev;
4861 }
4862
2716b802 4863 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4864 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4865 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4866 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4867 ext4_msg(sb, KERN_ERR, "external journal has "
4868 "bad superblock");
ac27a0ec
DK		 4869 brelse(bh);
4870 goto out_bdev;
4871 }
4872
df4763be
DW		 4873 if ((le32_to_cpu(es->s_feature_ro_compat) &
4874 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4875 es->s_checksum != ext4_superblock_csum(sb, es)) {
4876 ext4_msg(sb, KERN_ERR, "external journal has "
4877 "corrupt superblock");
4878 brelse(bh);
4879 goto out_bdev;
4880 }
4881
617ba13b 4882 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4883 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4884 brelse(bh);
4885 goto out_bdev;
4886 }
4887
bd81d8ee 4888 len = ext4_blocks_count(es);
ac27a0ec
DK		 4889 start = sb_block + 1;
4890 brelse(bh); /* we're done with the superblock */
4891
dab291af 4892 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4893 start, len, blocksize);
4894 if (!journal) {
b31e1552 4895 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4896 goto out_bdev;
4897 }
4898 journal->j_private = sb;
dfec8a14 4899 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4900 wait_on_buffer(journal->j_sb_buffer);
4901 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4902 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4903 goto out_journal;
4904 }
4905 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4906 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4907 "user (unsupported) - %d",
ac27a0ec
DK		 4908 be32_to_cpu(journal->j_superblock->s_nr_users));
4909 goto out_journal;
4910 }
617ba13b
MC		 4911 EXT4_SB(sb)->journal_bdev = bdev;
4912 ext4_init_journal_params(sb, journal);
ac27a0ec 4913 return journal;
0b8e58a1 4914
ac27a0ec 4915out_journal:
dab291af 4916 jbd2_journal_destroy(journal);
ac27a0ec 4917out_bdev:
617ba13b 4918 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4919 return NULL;
4920}
4921
617ba13b
MC		 4922static int ext4_load_journal(struct super_block *sb,
4923 struct ext4_super_block *es,
ac27a0ec
DK		 4924 unsigned long journal_devnum)
4925{
4926 journal_t *journal;
4927 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4928 dev_t journal_dev;
4929 int err = 0;
4930 int really_read_only;
4931
e2b911c5 4932 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4933
ac27a0ec
DK		 4934 if (journal_devnum &&
4935 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4936 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4937 "numbers have changed");
ac27a0ec
DK		 4938 journal_dev = new_decode_dev(journal_devnum);
4939 } else
4940 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4941
4942 really_read_only = bdev_read_only(sb->s_bdev);
4943
4944 /*
4945 * Are we loading a blank journal or performing recovery after a
4946 * crash? For recovery, we need to check in advance whether we
4947 * can get read-write access to the device.
4948 */
e2b911c5 4949 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 4950 if (sb_rdonly(sb)) {
b31e1552
ES		 4951 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4952 "required on readonly filesystem");
ac27a0ec 4953 if (really_read_only) {
b31e1552 4954 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 4955 "unavailable, cannot proceed "
4956 "(try mounting with noload)");
ac27a0ec
DK		 4957 return -EROFS;
4958 }
b31e1552
ES		 4959 ext4_msg(sb, KERN_INFO, "write access will "
4960 "be enabled during recovery");
ac27a0ec
DK		 4961 }
4962 }
4963
4964 if (journal_inum && journal_dev) {
b31e1552
ES		 4965 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4966 "and inode journals!");
ac27a0ec
DK		 4967 return -EINVAL;
4968 }
4969
4970 if (journal_inum) {
617ba13b 4971 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4972 return -EINVAL;
4973 } else {
617ba13b 4974 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4975 return -EINVAL;
4976 }
4977
90576c0b 4978 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4979 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4980
e2b911c5 4981 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4982 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4983 if (!err) {
4984 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4985 if (save)
4986 memcpy(save, ((char *) es) +
4987 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4988 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4989 if (save)
4990 memcpy(((char *) es) + EXT4_S_ERR_START,
4991 save, EXT4_S_ERR_LEN);
4992 kfree(save);
4993 }
ac27a0ec
DK		 4994
4995 if (err) {
b31e1552 4996 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4997 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4998 return err;
4999 }
5000
617ba13b
MC		 5001 EXT4_SB(sb)->s_journal = journal;
5002 ext4_clear_journal_err(sb, es);
ac27a0ec 5003
c41303ce 5004 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 5005 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5006 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 5007
5008 /* Make sure we flush the recovery flag to disk. */
e2d67052 5009 ext4_commit_super(sb, 1);
ac27a0ec
DK		 5010 }
5011
5012 return 0;
5013}
5014
e2d67052 5015static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 5016{
e2d67052 5017 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 5018 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 5019 int error = 0;
ac27a0ec 5020
bdfe0cbd 5021 if (!sbh || block_device_ejected(sb))
c4be0c1d 5022 return error;
a17712c8
JD		 5023
5024 /*
5025 * The superblock bh should be mapped, but it might not be if the
5026 * device was hot-removed. Not much we can do but fail the I/O.
5027 */
5028 if (!buffer_mapped(sbh))
5029 return error;
5030
71290b36
TT		 5031 /*
5032 * If the file system is mounted read-only, don't update the
5033 * superblock write time. This avoids updating the superblock
5034 * write time when we are mounting the root file system
5035 * read/only but we need to replay the journal; at that point,
5036 * for people who are east of GMT and who make their clock
5037 * tick in localtime for Windows bug-for-bug compatibility,
5038 * the clock is set in the future, and this will cause e2fsck
5039 * to complain and force a full file system check.
5040 */
1751e8a6 5041 if (!(sb->s_flags & SB_RDONLY))
6a0678a7 5042 ext4_update_tstamp(es, s_wtime);
f613dfcb
TT		 5043 if (sb->s_bdev->bd_part)
5044 es->s_kbytes_written =
5045 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
dbae2c55
MC		 5046 ((part_stat_read(sb->s_bdev->bd_part,
5047 sectors[STAT_WRITE]) -
afc32f7e 5048 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 5049 else
5050 es->s_kbytes_written =
5051 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 5052 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5053 ext4_free_blocks_count_set(es,
57042651
TT		 5054 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5055 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 5056 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5057 es->s_free_inodes_count =
5058 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 5059 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 5060 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 5061 ext4_superblock_csum_set(sb);
1566a48a
TT		 5062 if (sync)
5063 lock_buffer(sbh);
e8680786 5064 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 5065 /*
5066 * Oh, dear. A previous attempt to write the
5067 * superblock failed. This could happen because the
5068 * USB device was yanked out. Or it could happen to
5069 * be a transient write error and maybe the block will
5070 * be remapped. Nothing we can do but to retry the
5071 * write and hope for the best.
5072 */
5073 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5074 "superblock detected");
5075 clear_buffer_write_io_error(sbh);
5076 set_buffer_uptodate(sbh);
5077 }
ac27a0ec 5078 mark_buffer_dirty(sbh);
914258bf 5079 if (sync) {
1566a48a 5080 unlock_buffer(sbh);
564bc402 5081 error = __sync_dirty_buffer(sbh,
00473374 5082 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c89128a0 5083 if (buffer_write_io_error(sbh)) {
b31e1552
ES		 5084 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5085 "superblock");
914258bf
TT		 5086 clear_buffer_write_io_error(sbh);
5087 set_buffer_uptodate(sbh);
5088 }
5089 }
c4be0c1d 5090 return error;
ac27a0ec
DK		 5091}
5092
ac27a0ec
DK		 5093/*
5094 * Have we just finished recovery? If so, and if we are mounting (or
5095 * remounting) the filesystem readonly, then we will end up with a
5096 * consistent fs on disk. Record that fact.
5097 */
2b2d6d01
TT		 5098static void ext4_mark_recovery_complete(struct super_block *sb,
5099 struct ext4_super_block *es)
ac27a0ec 5100{
617ba13b 5101 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 5102
e2b911c5 5103 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 5104 BUG_ON(journal != NULL);
5105 return;
5106 }
dab291af 5107 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 5108 if (jbd2_journal_flush(journal) < 0)
5109 goto out;
5110
bc98a42c 5111 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 5112 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 5113 ext4_commit_super(sb, 1);
ac27a0ec 5114 }
7ffe1ea8
HK		 5115
5116out:
dab291af 5117 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 5118}
5119
5120/*
5121 * If we are mounting (or read-write remounting) a filesystem whose journal
5122 * has recorded an error from a previous lifetime, move that error to the
5123 * main filesystem now.
5124 */
2b2d6d01
TT		 5125static void ext4_clear_journal_err(struct super_block *sb,
5126 struct ext4_super_block *es)
ac27a0ec
DK		 5127{
5128 journal_t *journal;
5129 int j_errno;
5130 const char *errstr;
5131
e2b911c5 5132 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 5133
617ba13b 5134 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 5135
5136 /*
5137 * Now check for any error status which may have been recorded in the
617ba13b 5138 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 5139 */
5140
dab291af 5141 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 5142 if (j_errno) {
5143 char nbuf[16];
5144
617ba13b 5145 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 5146 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 5147 "from previous mount: %s", errstr);
12062ddd 5148 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 5149
617ba13b
MC		 5150 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5151 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 5152 ext4_commit_super(sb, 1);
ac27a0ec 5153
dab291af 5154 jbd2_journal_clear_err(journal);
d796c52e 5155 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 5156 }
5157}
5158
5159/*
5160 * Force the running and committing transactions to commit,
5161 * and wait on the commit.
5162 */
617ba13b 5163int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 5164{
5165 journal_t *journal;
ac27a0ec 5166
bc98a42c 5167 if (sb_rdonly(sb))
ac27a0ec
DK		 5168 return 0;
5169
617ba13b 5170 journal = EXT4_SB(sb)->s_journal;
b1deefc9 5171 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 5172}
5173
617ba13b 5174static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 5175{
14ce0cb4 5176 int ret = 0;
9eddacf9 5177 tid_t target;
06a407f1 5178 bool needs_barrier = false;
8d5d02e6 5179 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5180
49598e04 5181 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 5182 return 0;
5183
9bffad1e 5184 trace_ext4_sync_fs(sb, wait);
2e8fa54e 5185 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 5186 /*
5187 * Writeback quota in non-journalled quota case - journalled quota has
5188 * no dirty dquots
5189 */
5190 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 5191 /*
5192 * Data writeback is possible w/o journal transaction, so barrier must
5193 * being sent at the end of the function. But we can skip it if
5194 * transaction_commit will do it for us.
5195 */
bda32530
TT		 5196 if (sbi->s_journal) {
5197 target = jbd2_get_latest_transaction(sbi->s_journal);
5198 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5199 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5200 needs_barrier = true;
5201
5202 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5203 if (wait)
5204 ret = jbd2_log_wait_commit(sbi->s_journal,
5205 target);
5206 }
5207 } else if (wait && test_opt(sb, BARRIER))
06a407f1 5208 needs_barrier = true;
06a407f1
DM		 5209 if (needs_barrier) {
5210 int err;
5211 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5212 if (!ret)
5213 ret = err;
0390131b 5214 }
06a407f1
DM		 5215
5216 return ret;
5217}
5218
ac27a0ec
DK		 5219/*
5220 * LVM calls this function before a (read-only) snapshot is created. This
5221 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 5222 *
5223 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 5224 * state independently. It relies on upper layer to stop all data & metadata
5225 * modifications.
ac27a0ec 5226 */
c4be0c1d 5227static int ext4_freeze(struct super_block *sb)
ac27a0ec 5228{
c4be0c1d
TS		 5229 int error = 0;
5230 journal_t *journal;
ac27a0ec 5231
bc98a42c 5232 if (sb_rdonly(sb))
9ca92389 5233 return 0;
ac27a0ec 5234
9ca92389 5235 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 5236
bb044576
TT		 5237 if (journal) {
5238 /* Now we set up the journal barrier. */
5239 jbd2_journal_lock_updates(journal);
ac27a0ec 5240
bb044576
TT		 5241 /*
5242 * Don't clear the needs_recovery flag if we failed to
5243 * flush the journal.
5244 */
5245 error = jbd2_journal_flush(journal);
5246 if (error < 0)
5247 goto out;
c642dc9e
ES		 5248
5249 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 5250 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 5251 }
9ca92389 5252
9ca92389 5253 error = ext4_commit_super(sb, 1);
6b0310fb 5254out:
bb044576
TT		 5255 if (journal)
5256 /* we rely on upper layer to stop further updates */
5257 jbd2_journal_unlock_updates(journal);
6b0310fb 5258 return error;
ac27a0ec
DK		 5259}
5260
5261/*
5262 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5263 * flag here, even though the filesystem is not technically dirty yet.
5264 */
c4be0c1d 5265static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 5266{
bc98a42c 5267 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 5268 return 0;
5269
c642dc9e
ES		 5270 if (EXT4_SB(sb)->s_journal) {
5271 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 5272 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 5273 }
5274
9ca92389 5275 ext4_commit_super(sb, 1);
c4be0c1d 5276 return 0;
ac27a0ec
DK		 5277}
5278
673c6100
TT		 5279/*
5280 * Structure to save mount options for ext4_remount's benefit
5281 */
5282struct ext4_mount_options {
5283 unsigned long s_mount_opt;
a2595b8a 5284 unsigned long s_mount_opt2;
08cefc7a
EB		 5285 kuid_t s_resuid;
5286 kgid_t s_resgid;
673c6100
TT		 5287 unsigned long s_commit_interval;
5288 u32 s_min_batch_time, s_max_batch_time;
5289#ifdef CONFIG_QUOTA
5290 int s_jquota_fmt;
a2d4a646 5291 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 5292#endif
5293};
5294
2b2d6d01 5295static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5296{
2b2d6d01 5297 struct ext4_super_block *es;
617ba13b 5298 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5299 unsigned long old_sb_flags;
617ba13b 5300 struct ext4_mount_options old_opts;
c79d967d 5301 int enable_quota = 0;
8a266467 5302 ext4_group_t g;
b3881f74 5303 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5304 int err = 0;
ac27a0ec 5305#ifdef CONFIG_QUOTA
03dafb5f 5306 int i, j;
33458eab 5307 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec 5308#endif
d4c402d9 5309 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec 5310
21ac738e
CX		 5311 if (data && !orig_data)
5312 return -ENOMEM;
5313
ac27a0ec
DK		 5314 /* Store the original options */
5315 old_sb_flags = sb->s_flags;
5316 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5317 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5318 old_opts.s_resuid = sbi->s_resuid;
5319 old_opts.s_resgid = sbi->s_resgid;
5320 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5321 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5322 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5323#ifdef CONFIG_QUOTA
5324 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5325 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5326 if (sbi->s_qf_names[i]) {
33458eab
TT		 5327 char *qf_name = get_qf_name(sb, sbi, i);
5328
5329 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 5330 if (!old_opts.s_qf_names[i]) {
5331 for (j = 0; j < i; j++)
5332 kfree(old_opts.s_qf_names[j]);
3e36a163 5333 kfree(orig_data);
03dafb5f
CG		 5334 return -ENOMEM;
5335 }
5336 } else
5337 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5338#endif
b3881f74
TT		 5339 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5340 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5341
661aa520 5342 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5343 err = -EINVAL;
5344 goto restore_opts;
5345 }
5346
6b992ff2 5347 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5348 test_opt(sb, JOURNAL_CHECKSUM)) {
5349 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5350 "during remount not supported; ignoring");
5351 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5352 }
5353
6ae6514b
PS		 5354 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5355 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5356 ext4_msg(sb, KERN_ERR, "can't mount with "
5357 "both data=journal and delalloc");
5358 err = -EINVAL;
5359 goto restore_opts;
5360 }
5361 if (test_opt(sb, DIOREAD_NOLOCK)) {
5362 ext4_msg(sb, KERN_ERR, "can't mount with "
5363 "both data=journal and dioread_nolock");
5364 err = -EINVAL;
5365 goto restore_opts;
5366 }
923ae0ff
RZ		 5367 if (test_opt(sb, DAX)) {
5368 ext4_msg(sb, KERN_ERR, "can't mount with "
5369 "both data=journal and dax");
5370 err = -EINVAL;
5371 goto restore_opts;
5372 }
ab04df78
JK		 5373 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5374 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5375 ext4_msg(sb, KERN_ERR, "can't mount with "
5376 "journal_async_commit in data=ordered mode");
5377 err = -EINVAL;
5378 goto restore_opts;
5379 }
923ae0ff
RZ		 5380 }
5381
cdb7ee4c
TE		 5382 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5383 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5384 err = -EINVAL;
5385 goto restore_opts;
5386 }
5387
923ae0ff
RZ		 5388 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5389 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5390 "dax flag with busy inodes while remounting");
5391 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 5392 }
5393
4ab2f15b 5394 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 5395 ext4_abort(sb, "Abort forced by user");
ac27a0ec 5396
1751e8a6
LT		 5397 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5398 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5399
5400 es = sbi->s_es;
5401
b3881f74 5402 if (sbi->s_journal) {
0390131b 5403 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5404 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5405 }
ac27a0ec 5406
1751e8a6
LT		 5407 if (*flags & SB_LAZYTIME)
5408 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5409
1751e8a6 5410 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5411 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5412 err = -EROFS;
5413 goto restore_opts;
5414 }
5415
1751e8a6 5416 if (*flags & SB_RDONLY) {
38c03b34
TT		 5417 err = sync_filesystem(sb);
5418 if (err < 0)
5419 goto restore_opts;
0f0dd62f
CH		 5420 err = dquot_suspend(sb, -1);
5421 if (err < 0)
c79d967d 5422 goto restore_opts;
c79d967d 5423
ac27a0ec
DK		 5424 /*
5425 * First of all, the unconditional stuff we have to do
5426 * to disable replay of the journal when we next remount
5427 */
1751e8a6 5428 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5429
5430 /*
5431 * OK, test if we are remounting a valid rw partition
5432 * readonly, and if so set the rdonly flag and then
5433 * mark the partition as valid again.
5434 */
617ba13b
MC		 5435 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5436 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5437 es->s_state = cpu_to_le16(sbi->s_mount_state);
5438
a63c9eb2 5439 if (sbi->s_journal)
0390131b 5440 ext4_mark_recovery_complete(sb, es);
2dca60d9
TT		 5441 if (sbi->s_mmp_tsk)
5442 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5443 } else {
a13fb1a4 5444 /* Make sure we can mount this feature set readwrite */
e2b911c5 5445 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5446 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5447 err = -EROFS;
5448 goto restore_opts;
5449 }
8a266467
TT		 5450 /*
5451 * Make sure the group descriptor checksums
0b8e58a1 5452 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5453 */
5454 for (g = 0; g < sbi->s_groups_count; g++) {
5455 struct ext4_group_desc *gdp =
5456 ext4_get_group_desc(sb, g, NULL);
5457
feb0ab32 5458 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5459 ext4_msg(sb, KERN_ERR,
5460 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5461 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5462 le16_to_cpu(gdp->bg_checksum));
6a797d27 5463 err = -EFSBADCRC;
8a266467
TT		 5464 goto restore_opts;
5465 }
5466 }
5467
ead6596b
ES		 5468 /*
5469 * If we have an unprocessed orphan list hanging
5470 * around from a previously readonly bdev mount,
5471 * require a full umount/remount for now.
5472 */
5473 if (es->s_last_orphan) {
b31e1552 5474 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5475 "remount RDWR because of unprocessed "
5476 "orphan inode list. Please "
b31e1552 5477 "umount/remount instead");
ead6596b
ES		 5478 err = -EINVAL;
5479 goto restore_opts;
5480 }
5481
ac27a0ec
DK		 5482 /*
5483 * Mounting a RDONLY partition read-write, so reread
5484 * and store the current valid flag. (It may have
5485 * been changed by e2fsck since we originally mounted
5486 * the partition.)
5487 */
0390131b
FM		 5488 if (sbi->s_journal)
5489 ext4_clear_journal_err(sb, es);
ac27a0ec 5490 sbi->s_mount_state = le16_to_cpu(es->s_state);
c89128a0
JK		 5491
5492 err = ext4_setup_super(sb, es, 0);
5493 if (err)
5494 goto restore_opts;
5495
5496 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5497 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5498 if (ext4_multi_mount_protect(sb,
5499 le64_to_cpu(es->s_mmp_block))) {
5500 err = -EROFS;
5501 goto restore_opts;
5502 }
c79d967d 5503 enable_quota = 1;
ac27a0ec
DK		 5504 }
5505 }
bfff6873
LC		 5506
5507 /*
5508 * Reinitialize lazy itable initialization thread based on
5509 * current settings
5510 */
bc98a42c 5511 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5512 ext4_unregister_li_request(sb);
5513 else {
5514 ext4_group_t first_not_zeroed;
5515 first_not_zeroed = ext4_has_uninit_itable(sb);
5516 ext4_register_li_request(sb, first_not_zeroed);
5517 }
5518
6fd058f7 5519 ext4_setup_system_zone(sb);
c89128a0
JK		 5520 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5521 err = ext4_commit_super(sb, 1);
5522 if (err)
5523 goto restore_opts;
5524 }
0390131b 5525
ac27a0ec
DK		 5526#ifdef CONFIG_QUOTA
5527 /* Release old quota file names */
a2d4a646 5528 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5529 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5530 if (enable_quota) {
5531 if (sb_any_quota_suspended(sb))
5532 dquot_resume(sb, -1);
e2b911c5 5533 else if (ext4_has_feature_quota(sb)) {
7c319d32 5534 err = ext4_enable_quotas(sb);
07724f98 5535 if (err)
7c319d32 5536 goto restore_opts;
7c319d32
AK		 5537 }
5538 }
ac27a0ec 5539#endif
d4c402d9 5540
1751e8a6 5541 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5542 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5543 kfree(orig_data);
ac27a0ec 5544 return 0;
0b8e58a1 5545
ac27a0ec
DK		 5546restore_opts:
5547 sb->s_flags = old_sb_flags;
5548 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5549 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5550 sbi->s_resuid = old_opts.s_resuid;
5551 sbi->s_resgid = old_opts.s_resgid;
5552 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5553 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5554 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5555#ifdef CONFIG_QUOTA
5556 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5557 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
33458eab
TT		 5558 to_free[i] = get_qf_name(sb, sbi, i);
5559 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 5560 }
33458eab
TT		 5561 synchronize_rcu();
5562 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5563 kfree(to_free[i]);
ac27a0ec 5564#endif
d4c402d9 5565 kfree(orig_data);
ac27a0ec
DK		 5566 return err;
5567}
5568
689c958c
LX		 5569#ifdef CONFIG_QUOTA
5570static int ext4_statfs_project(struct super_block *sb,
5571 kprojid_t projid, struct kstatfs *buf)
5572{
5573 struct kqid qid;
5574 struct dquot *dquot;
5575 u64 limit;
5576 u64 curblock;
5577
5578 qid = make_kqid_projid(projid);
5579 dquot = dqget(sb, qid);
5580 if (IS_ERR(dquot))
5581 return PTR_ERR(dquot);
7b9ca4c6 5582 spin_lock(&dquot->dq_dqb_lock);
689c958c 5583
46d36880 5584 limit = dquot->dq_dqb.dqb_bsoftlimit;
57c32ea4
CX		 5585 if (dquot->dq_dqb.dqb_bhardlimit &&
5586 (!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
5587 limit = dquot->dq_dqb.dqb_bhardlimit;
5588 limit >>= sb->s_blocksize_bits;
5589
689c958c 5590 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 5591 curblock = (dquot->dq_dqb.dqb_curspace +
5592 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 5593 buf->f_blocks = limit;
5594 buf->f_bfree = buf->f_bavail =
5595 (buf->f_blocks > curblock) ?
5596 (buf->f_blocks - curblock) : 0;
5597 }
5598
46d36880 5599 limit = dquot->dq_dqb.dqb_isoftlimit;
57c32ea4
CX		 5600 if (dquot->dq_dqb.dqb_ihardlimit &&
5601 (!limit || dquot->dq_dqb.dqb_ihardlimit < limit))
5602 limit = dquot->dq_dqb.dqb_ihardlimit;
5603
689c958c
LX		 5604 if (limit && buf->f_files > limit) {
5605 buf->f_files = limit;
5606 buf->f_ffree =
5607 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5608 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5609 }
5610
7b9ca4c6 5611 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5612 dqput(dquot);
5613 return 0;
5614}
5615#endif
5616
2b2d6d01 5617static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5618{
5619 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5620 struct ext4_sb_info *sbi = EXT4_SB(sb);
5621 struct ext4_super_block *es = sbi->s_es;
27dd4385 5622 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5623 u64 fsid;
d02a9391 5624 s64 bfree;
27dd4385 5625 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5626
952fc18e
TT		 5627 if (!test_opt(sb, MINIX_DF))
5628 overhead = sbi->s_overhead;
ac27a0ec 5629
617ba13b 5630 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5631 buf->f_bsize = sb->s_blocksize;
b72f78cb 5632 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5633 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5634 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5635 /* prevent underflow in case that few free space is available */
57042651 5636 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5637 buf->f_bavail = buf->f_bfree -
5638 (ext4_r_blocks_count(es) + resv_blocks);
5639 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5640 buf->f_bavail = 0;
5641 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5642 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5643 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5644 fsid = le64_to_cpup((void *)es->s_uuid) ^
5645 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5646 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5647 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5648
689c958c
LX		 5649#ifdef CONFIG_QUOTA
5650 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5651 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5652 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5653#endif
ac27a0ec
DK		 5654 return 0;
5655}
5656
ac27a0ec
DK		 5657
5658#ifdef CONFIG_QUOTA
5659
bc8230ee
JK		 5660/*
5661 * Helper functions so that transaction is started before we acquire dqio_sem
5662 * to keep correct lock ordering of transaction > dqio_sem
5663 */
ac27a0ec
DK		 5664static inline struct inode *dquot_to_inode(struct dquot *dquot)
5665{
4c376dca 5666 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5667}
5668
617ba13b 5669static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5670{
5671 int ret, err;
5672 handle_t *handle;
5673 struct inode *inode;
5674
5675 inode = dquot_to_inode(dquot);
9924a92a 5676 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5677 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5678 if (IS_ERR(handle))
5679 return PTR_ERR(handle);
5680 ret = dquot_commit(dquot);
617ba13b 5681 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5682 if (!ret)
5683 ret = err;
5684 return ret;
5685}
5686
617ba13b 5687static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5688{
5689 int ret, err;
5690 handle_t *handle;
5691
9924a92a 5692 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5693 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5694 if (IS_ERR(handle))
5695 return PTR_ERR(handle);
5696 ret = dquot_acquire(dquot);
617ba13b 5697 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5698 if (!ret)
5699 ret = err;
5700 return ret;
5701}
5702
617ba13b 5703static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5704{
5705 int ret, err;
5706 handle_t *handle;
5707
9924a92a 5708 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5709 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5710 if (IS_ERR(handle)) {
5711 /* Release dquot anyway to avoid endless cycle in dqput() */
5712 dquot_release(dquot);
ac27a0ec 5713 return PTR_ERR(handle);
9c3013e9 5714 }
ac27a0ec 5715 ret = dquot_release(dquot);
617ba13b 5716 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5717 if (!ret)
5718 ret = err;
5719 return ret;
5720}
5721
617ba13b 5722static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5723{
262b4662
JK		 5724 struct super_block *sb = dquot->dq_sb;
5725 struct ext4_sb_info *sbi = EXT4_SB(sb);
5726
2c8be6b2 5727 /* Are we journaling quotas? */
e2b911c5 5728 if (ext4_has_feature_quota(sb) ||
262b4662 5729 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5730 dquot_mark_dquot_dirty(dquot);
617ba13b 5731 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5732 } else {
5733 return dquot_mark_dquot_dirty(dquot);
5734 }
5735}
5736
617ba13b 5737static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5738{
5739 int ret, err;
5740 handle_t *handle;
5741
5742 /* Data block + inode block */
2b0143b5 5743 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5744 if (IS_ERR(handle))
5745 return PTR_ERR(handle);
5746 ret = dquot_commit_info(sb, type);
617ba13b 5747 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5748 if (!ret)
5749 ret = err;
5750 return ret;
5751}
5752
5753/*
5754 * Turn on quotas during mount time - we need to find
5755 * the quota file and such...
5756 */
617ba13b 5757static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5758{
33458eab 5759 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
287a8095 5760 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5761}
5762
daf647d2
TT		 5763static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5764{
5765 struct ext4_inode_info *ei = EXT4_I(inode);
5766
5767 /* The first argument of lockdep_set_subclass has to be
5768 * *exactly* the same as the argument to init_rwsem() --- in
5769 * this case, in init_once() --- or lockdep gets unhappy
5770 * because the name of the lock is set using the
5771 * stringification of the argument to init_rwsem().
5772 */
5773 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5774 lockdep_set_subclass(&ei->i_data_sem, subclass);
5775}
5776
ac27a0ec
DK		 5777/*
5778 * Standard function to be called on quota_on
5779 */
617ba13b 5780static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5781 const struct path *path)
ac27a0ec
DK		 5782{
5783 int err;
ac27a0ec
DK		 5784
5785 if (!test_opt(sb, QUOTA))
5786 return -EINVAL;
0623543b 5787
ac27a0ec 5788 /* Quotafile not on the same filesystem? */
d8c9584e 5789 if (path->dentry->d_sb != sb)
ac27a0ec 5790 return -EXDEV;
0623543b
JK		 5791 /* Journaling quota? */
5792 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5793 /* Quotafile not in fs root? */
f00c9e44 5794 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5795 ext4_msg(sb, KERN_WARNING,
5796 "Quota file not on filesystem root. "
5797 "Journaled quota will not work");
91389240
JK		 5798 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5799 } else {
5800 /*
5801 * Clear the flag just in case mount options changed since
5802 * last time.
5803 */
5804 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 5805 }
0623543b
JK		 5806
5807 /*
5808 * When we journal data on quota file, we have to flush journal to see
5809 * all updates to the file when we bypass pagecache...
5810 */
0390131b 5811 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5812 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5813 /*
5814 * We don't need to lock updates but journal_flush() could
5815 * otherwise be livelocked...
5816 */
5817 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5818 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5819 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5820 if (err)
7ffe1ea8 5821 return err;
0623543b 5822 }
957153fc 5823
daf647d2
TT		 5824 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5825 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5826 if (err) {
daf647d2
TT		 5827 lockdep_set_quota_inode(path->dentry->d_inode,
5828 I_DATA_SEM_NORMAL);
957153fc
JK		 5829 } else {
5830 struct inode *inode = d_inode(path->dentry);
5831 handle_t *handle;
5832
61a92987
JK		 5833 /*
5834 * Set inode flags to prevent userspace from messing with quota
5835 * files. If this fails, we return success anyway since quotas
5836 * are already enabled and this is not a hard failure.
5837 */
957153fc
JK		 5838 inode_lock(inode);
5839 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5840 if (IS_ERR(handle))
5841 goto unlock_inode;
5842 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5843 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5844 S_NOATIME | S_IMMUTABLE);
5845 ext4_mark_inode_dirty(handle, inode);
5846 ext4_journal_stop(handle);
5847 unlock_inode:
5848 inode_unlock(inode);
5849 }
daf647d2 5850 return err;
ac27a0ec
DK		 5851}
5852
7c319d32
AK		 5853static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5854 unsigned int flags)
5855{
5856 int err;
5857 struct inode *qf_inode;
a2d4a646 5858 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5859 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5860 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5861 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5862 };
5863
e2b911c5 5864 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5865
5866 if (!qf_inums[type])
5867 return -EPERM;
5868
8a363970 5869 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32
AK		 5870 if (IS_ERR(qf_inode)) {
5871 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5872 return PTR_ERR(qf_inode);
5873 }
5874
bcb13850
JK		 5875 /* Don't account quota for quota files to avoid recursion */
5876 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5877 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7212b95e 5878 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
daf647d2
TT		 5879 if (err)
5880 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
61157b24 5881 iput(qf_inode);
7c319d32
AK		 5882
5883 return err;
5884}
5885
5886/* Enable usage tracking for all quota types. */
5887static int ext4_enable_quotas(struct super_block *sb)
5888{
5889 int type, err = 0;
a2d4a646 5890 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5891 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5892 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5893 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5894 };
49da9392
JK		 5895 bool quota_mopt[EXT4_MAXQUOTAS] = {
5896 test_opt(sb, USRQUOTA),
5897 test_opt(sb, GRPQUOTA),
5898 test_opt(sb, PRJQUOTA),
5899 };
7c319d32 5900
91389240 5901 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 5902 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5903 if (qf_inums[type]) {
5904 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5905 DQUOT_USAGE_ENABLED |
5906 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 5907 if (err) {
5908 ext4_warning(sb,
72ba7450
TT		 5909 "Failed to enable quota tracking "
5910 "(type=%d, err=%d). Please run "
5911 "e2fsck to fix.", type, err);
7f144fd0
JU		 5912 for (type--; type >= 0; type--)
5913 dquot_quota_off(sb, type);
5914
7c319d32
AK		 5915 return err;
5916 }
5917 }
5918 }
5919 return 0;
5920}
5921
ca0e05e4
DM		 5922static int ext4_quota_off(struct super_block *sb, int type)
5923{
21f97697
JK		 5924 struct inode *inode = sb_dqopt(sb)->files[type];
5925 handle_t *handle;
957153fc 5926 int err;
21f97697 5927
87009d86
DM		 5928 /* Force all delayed allocation blocks to be allocated.
5929 * Caller already holds s_umount sem */
5930 if (test_opt(sb, DELALLOC))
ca0e05e4 5931 sync_filesystem(sb);
ca0e05e4 5932
957153fc 5933 if (!inode || !igrab(inode))
0b268590
AG		 5934 goto out;
5935
957153fc 5936 err = dquot_quota_off(sb, type);
964edf66 5937 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 5938 goto out_put;
5939
5940 inode_lock(inode);
61a92987
JK		 5941 /*
5942 * Update modification times of quota files when userspace can
5943 * start looking at them. If we fail, we return success anyway since
5944 * this is not a hard failure and quotas are already disabled.
5945 */
9924a92a 5946 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697 5947 if (IS_ERR(handle))
957153fc
JK		 5948 goto out_unlock;
5949 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5950 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 5951 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5952 ext4_mark_inode_dirty(handle, inode);
5953 ext4_journal_stop(handle);
957153fc
JK		 5954out_unlock:
5955 inode_unlock(inode);
5956out_put:
964edf66 5957 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 5958 iput(inode);
5959 return err;
21f97697 5960out:
ca0e05e4
DM		 5961 return dquot_quota_off(sb, type);
5962}
5963
ac27a0ec
DK		 5964/* Read data from quotafile - avoid pagecache and such because we cannot afford
5965 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5966 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5967 * we don't have to be afraid of races */
617ba13b 5968static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5969 size_t len, loff_t off)
5970{
5971 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5972 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5973 int offset = off & (sb->s_blocksize - 1);
5974 int tocopy;
5975 size_t toread;
5976 struct buffer_head *bh;
5977 loff_t i_size = i_size_read(inode);
5978
5979 if (off > i_size)
5980 return 0;
5981 if (off+len > i_size)
5982 len = i_size-off;
5983 toread = len;
5984 while (toread > 0) {
5985 tocopy = sb->s_blocksize - offset < toread ?
5986 sb->s_blocksize - offset : toread;
1c215028
TT		 5987 bh = ext4_bread(NULL, inode, blk, 0);
5988 if (IS_ERR(bh))
5989 return PTR_ERR(bh);
ac27a0ec
DK		 5990 if (!bh) /* A hole? */
5991 memset(data, 0, tocopy);
5992 else
5993 memcpy(data, bh->b_data+offset, tocopy);
5994 brelse(bh);
5995 offset = 0;
5996 toread -= tocopy;
5997 data += tocopy;
5998 blk++;
5999 }
6000 return len;
6001}
6002
6003/* Write to quotafile (we know the transaction is already started and has
6004 * enough credits) */
617ba13b 6005static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 6006 const char *data, size_t len, loff_t off)
6007{
6008 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 6009 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 6010 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 6011 int retries = 0;
ac27a0ec
DK		 6012 struct buffer_head *bh;
6013 handle_t *handle = journal_current_handle();
6014
0390131b 6015 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 6016 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6017 " cancelled because transaction is not started",
9c3013e9
JK		 6018 (unsigned long long)off, (unsigned long long)len);
6019 return -EIO;
6020 }
67eeb568
DM		 6021 /*
6022 * Since we account only one data block in transaction credits,
6023 * then it is impossible to cross a block boundary.
6024 */
6025 if (sb->s_blocksize - offset < len) {
6026 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6027 " cancelled because not block aligned",
6028 (unsigned long long)off, (unsigned long long)len);
6029 return -EIO;
6030 }
6031
c5e298ae
TT		 6032 do {
6033 bh = ext4_bread(handle, inode, blk,
6034 EXT4_GET_BLOCKS_CREATE |
6035 EXT4_GET_BLOCKS_METADATA_NOFAIL);
45586c70 6036 } while (PTR_ERR(bh) == -ENOSPC &&
c5e298ae 6037 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 6038 if (IS_ERR(bh))
6039 return PTR_ERR(bh);
67eeb568
DM		 6040 if (!bh)
6041 goto out;
5d601255 6042 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 6043 err = ext4_journal_get_write_access(handle, bh);
6044 if (err) {
6045 brelse(bh);
1c215028 6046 return err;
ac27a0ec 6047 }
67eeb568
DM		 6048 lock_buffer(bh);
6049 memcpy(bh->b_data+offset, data, len);
6050 flush_dcache_page(bh->b_page);
6051 unlock_buffer(bh);
62d2b5f2 6052 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 6053 brelse(bh);
ac27a0ec 6054out:
67eeb568
DM		 6055 if (inode->i_size < off + len) {
6056 i_size_write(inode, off + len);
617ba13b 6057 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 6058 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 6059 }
67eeb568 6060 return len;
ac27a0ec 6061}
ac27a0ec
DK		 6062#endif
6063
152a0836
AV		 6064static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6065 const char *dev_name, void *data)
ac27a0ec 6066{
152a0836 6067 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 6068}
6069
c290ea01 6070#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 6071static inline void register_as_ext2(void)
6072{
6073 int err = register_filesystem(&ext2_fs_type);
6074 if (err)
6075 printk(KERN_WARNING
6076 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6077}
6078
6079static inline void unregister_as_ext2(void)
6080{
6081 unregister_filesystem(&ext2_fs_type);
6082}
2035e776
TT		 6083
6084static inline int ext2_feature_set_ok(struct super_block *sb)
6085{
e2b911c5 6086 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 6087 return 0;
bc98a42c 6088 if (sb_rdonly(sb))
2035e776 6089 return 1;
e2b911c5 6090 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 6091 return 0;
6092 return 1;
6093}
24b58424
TT		 6094#else
6095static inline void register_as_ext2(void) { }
6096static inline void unregister_as_ext2(void) { }
2035e776 6097static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 6098#endif
6099
24b58424
TT		 6100static inline void register_as_ext3(void)
6101{
6102 int err = register_filesystem(&ext3_fs_type);
6103 if (err)
6104 printk(KERN_WARNING
6105 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6106}
6107
6108static inline void unregister_as_ext3(void)
6109{
6110 unregister_filesystem(&ext3_fs_type);
6111}
2035e776
TT		 6112
6113static inline int ext3_feature_set_ok(struct super_block *sb)
6114{
e2b911c5 6115 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 6116 return 0;
e2b911c5 6117 if (!ext4_has_feature_journal(sb))
2035e776 6118 return 0;
bc98a42c 6119 if (sb_rdonly(sb))
2035e776 6120 return 1;
e2b911c5 6121 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 6122 return 0;
6123 return 1;
6124}
24b58424 6125
03010a33
TT		 6126static struct file_system_type ext4_fs_type = {
6127 .owner = THIS_MODULE,
6128 .name = "ext4",
152a0836 6129 .mount = ext4_mount,
03010a33
TT		 6130 .kill_sb = kill_block_super,
6131 .fs_flags = FS_REQUIRES_DEV,
6132};
7f78e035 6133MODULE_ALIAS_FS("ext4");
03010a33 6134
e9e3bcec
ES		 6135/* Shared across all ext4 file systems */
6136wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 6137
5dabfc78 6138static int __init ext4_init_fs(void)
ac27a0ec 6139{
e9e3bcec 6140 int i, err;
c9de560d 6141
e294a537 6142 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 6143 ext4_li_info = NULL;
6144 mutex_init(&ext4_li_mtx);
6145
9a4c8019 6146 /* Build-time check for flags consistency */
12e9b892 6147 ext4_check_flag_values();
e9e3bcec 6148
e142d052 6149 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 6150 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 6151
51865fda 6152 err = ext4_init_es();
6fd058f7
TT		 6153 if (err)
6154 return err;
51865fda 6155
1dc0aa46 6156 err = ext4_init_pending();
22cfe4b4
EB		 6157 if (err)
6158 goto out7;
6159
6160 err = ext4_init_post_read_processing();
1dc0aa46
EW		 6161 if (err)
6162 goto out6;
6163
51865fda
ZL		 6164 err = ext4_init_pageio();
6165 if (err)
b5799018 6166 goto out5;
51865fda 6167
5dabfc78 6168 err = ext4_init_system_zone();
bd2d0210 6169 if (err)
b5799018 6170 goto out4;
857ac889 6171
b5799018 6172 err = ext4_init_sysfs();
dd68314c 6173 if (err)
b5799018 6174 goto out3;
857ac889 6175
5dabfc78 6176 err = ext4_init_mballoc();
c9de560d
AT		 6177 if (err)
6178 goto out2;
ac27a0ec
DK		 6179 err = init_inodecache();
6180 if (err)
6181 goto out1;
24b58424 6182 register_as_ext3();
2035e776 6183 register_as_ext2();
03010a33 6184 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 6185 if (err)
6186 goto out;
bfff6873 6187
ac27a0ec
DK		 6188 return 0;
6189out:
24b58424
TT		 6190 unregister_as_ext2();
6191 unregister_as_ext3();
ac27a0ec
DK		 6192 destroy_inodecache();
6193out1:
5dabfc78 6194 ext4_exit_mballoc();
9c191f70 6195out2:
b5799018
TT		 6196 ext4_exit_sysfs();
6197out3:
5dabfc78 6198 ext4_exit_system_zone();
b5799018 6199out4:
5dabfc78 6200 ext4_exit_pageio();
b5799018 6201out5:
22cfe4b4 6202 ext4_exit_post_read_processing();
1dc0aa46 6203out6:
22cfe4b4
EB		 6204 ext4_exit_pending();
6205out7:
51865fda
ZL		 6206 ext4_exit_es();
6207
ac27a0ec
DK		 6208 return err;
6209}
6210
5dabfc78 6211static void __exit ext4_exit_fs(void)
ac27a0ec 6212{
bfff6873 6213 ext4_destroy_lazyinit_thread();
24b58424
TT		 6214 unregister_as_ext2();
6215 unregister_as_ext3();
03010a33 6216 unregister_filesystem(&ext4_fs_type);
ac27a0ec 6217 destroy_inodecache();
5dabfc78 6218 ext4_exit_mballoc();
b5799018 6219 ext4_exit_sysfs();
5dabfc78
TT		 6220 ext4_exit_system_zone();
6221 ext4_exit_pageio();
22cfe4b4 6222 ext4_exit_post_read_processing();
dd12ed14 6223 ext4_exit_es();
1dc0aa46 6224 ext4_exit_pending();
ac27a0ec
DK		 6225}
6226
6227MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 6228MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 6229MODULE_LICENSE("GPL");
7ef79ad5 6230MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 6231module_init(ext4_init_fs)
6232module_exit(ext4_exit_fs)
Linux 6.x block layer and io_uring tree(s)