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block: split bio_kmalloc from bio_alloc_bioset
[linux-2.6-block.git] / fs / ext4 / super.c
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f5166768 1// SPDX-License-Identifier: GPL-2.0
ac27a0ec 2/*
617ba13b 3 * linux/fs/ext4/super.c
ac27a0ec
DK		 4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
c5ca7c76 24#include <linux/vmalloc.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
66114cad 28#include <linux/backing-dev.h>
ac27a0ec 29#include <linux/parser.h>
ac27a0ec 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ef510424 41#include <linux/dax.h>
7abc52c2 42#include <linux/cleancache.h>
7c0f6ba6 43#include <linux/uaccess.h>
ee73f9a5 44#include <linux/iversion.h>
c83ad55e 45#include <linux/unicode.h>
c6a564ff 46#include <linux/part_stat.h>
bfff6873
LC		 47#include <linux/kthread.h>
48#include <linux/freezer.h>
49
3dcf5451 50#include "ext4.h"
4a092d73 51#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 52#include "ext4_jbd2.h"
ac27a0ec
DK		 53#include "xattr.h"
54#include "acl.h"
3661d286 55#include "mballoc.h"
0c9ec4be 56#include "fsmap.h"
ac27a0ec 57
9bffad1e
TT		 58#define CREATE_TRACE_POINTS
59#include <trace/events/ext4.h>
60
0b75a840
LC		 61static struct ext4_lazy_init *ext4_li_info;
62static struct mutex ext4_li_mtx;
e294a537 63static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 64
617ba13b 65static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 66 unsigned long journal_devnum);
2adf6da8 67static int ext4_show_options(struct seq_file *seq, struct dentry *root);
2d01ddc8 68static void ext4_update_super(struct super_block *sb);
4392fbc4 69static int ext4_commit_super(struct super_block *sb);
11215630 70static int ext4_mark_recovery_complete(struct super_block *sb,
2b2d6d01 71 struct ext4_super_block *es);
11215630
JK		 72static int ext4_clear_journal_err(struct super_block *sb,
73 struct ext4_super_block *es);
617ba13b 74static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 75static int ext4_remount(struct super_block *sb, int *flags, char *data);
76static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 77static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 78static int ext4_freeze(struct super_block *sb);
152a0836
AV		 79static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
2035e776
TT		 81static inline int ext2_feature_set_ok(struct super_block *sb);
82static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 83static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 84static void ext4_destroy_lazyinit_thread(void);
85static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 86static void ext4_clear_request_list(void);
c6cb7e77
EW		 87static struct inode *ext4_get_journal_inode(struct super_block *sb,
88 unsigned int journal_inum);
ac27a0ec 89
e74031fd
JK		 90/*
91 * Lock ordering
92 *
93 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
94 * i_mmap_rwsem (inode->i_mmap_rwsem)!
95 *
96 * page fault path:
c1e8d7c6 97 * mmap_lock -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
e74031fd
JK		 98 * page lock -> i_data_sem (rw)
99 *
100 * buffered write path:
c1e8d7c6 101 * sb_start_write -> i_mutex -> mmap_lock
e74031fd
JK		 102 * sb_start_write -> i_mutex -> transaction start -> page lock ->
103 * i_data_sem (rw)
104 *
105 * truncate:
1d39834f
NB		 106 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
107 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
108 * i_data_sem (rw)
e74031fd
JK		 109 *
110 * direct IO:
c1e8d7c6 111 * sb_start_write -> i_mutex -> mmap_lock
1d39834f 112 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
e74031fd
JK		 113 *
114 * writepages:
115 * transaction start -> page lock(s) -> i_data_sem (rw)
116 */
117
c290ea01 118#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 119static struct file_system_type ext2_fs_type = {
120 .owner = THIS_MODULE,
121 .name = "ext2",
122 .mount = ext4_mount,
123 .kill_sb = kill_block_super,
124 .fs_flags = FS_REQUIRES_DEV,
125};
7f78e035 126MODULE_ALIAS_FS("ext2");
fa7614dd 127MODULE_ALIAS("ext2");
2035e776
TT		 128#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
129#else
130#define IS_EXT2_SB(sb) (0)
131#endif
132
133
ba69f9ab
JK		 134static struct file_system_type ext3_fs_type = {
135 .owner = THIS_MODULE,
136 .name = "ext3",
152a0836 137 .mount = ext4_mount,
ba69f9ab
JK		 138 .kill_sb = kill_block_super,
139 .fs_flags = FS_REQUIRES_DEV,
140};
7f78e035 141MODULE_ALIAS_FS("ext3");
fa7614dd 142MODULE_ALIAS("ext3");
ba69f9ab 143#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 144
fa491b14 145
146static inline void __ext4_read_bh(struct buffer_head *bh, int op_flags,
147 bh_end_io_t *end_io)
148{
149 /*
150 * buffer's verified bit is no longer valid after reading from
151 * disk again due to write out error, clear it to make sure we
152 * recheck the buffer contents.
153 */
154 clear_buffer_verified(bh);
155
156 bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
157 get_bh(bh);
158 submit_bh(REQ_OP_READ, op_flags, bh);
159}
160
161void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
162 bh_end_io_t *end_io)
163{
164 BUG_ON(!buffer_locked(bh));
165
166 if (ext4_buffer_uptodate(bh)) {
167 unlock_buffer(bh);
168 return;
169 }
170 __ext4_read_bh(bh, op_flags, end_io);
171}
172
173int ext4_read_bh(struct buffer_head *bh, int op_flags, bh_end_io_t *end_io)
174{
175 BUG_ON(!buffer_locked(bh));
176
177 if (ext4_buffer_uptodate(bh)) {
178 unlock_buffer(bh);
179 return 0;
180 }
181
182 __ext4_read_bh(bh, op_flags, end_io);
183
184 wait_on_buffer(bh);
185 if (buffer_uptodate(bh))
186 return 0;
187 return -EIO;
188}
189
190int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait)
191{
192 if (trylock_buffer(bh)) {
193 if (wait)
194 return ext4_read_bh(bh, op_flags, NULL);
195 ext4_read_bh_nowait(bh, op_flags, NULL);
196 return 0;
197 }
198 if (wait) {
199 wait_on_buffer(bh);
200 if (buffer_uptodate(bh))
201 return 0;
202 return -EIO;
203 }
204 return 0;
205}
206
fb265c9c 207/*
8394a6ab 208 * This works like __bread_gfp() except it uses ERR_PTR for error
fb265c9c
TT		 209 * returns. Currently with sb_bread it's impossible to distinguish
210 * between ENOMEM and EIO situations (since both result in a NULL
211 * return.
212 */
8394a6ab 213static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
214 sector_t block, int op_flags,
215 gfp_t gfp)
fb265c9c 216{
2d069c08 217 struct buffer_head *bh;
218 int ret;
fb265c9c 219
8394a6ab 220 bh = sb_getblk_gfp(sb, block, gfp);
fb265c9c
TT		 221 if (bh == NULL)
222 return ERR_PTR(-ENOMEM);
cf2834a5 223 if (ext4_buffer_uptodate(bh))
fb265c9c 224 return bh;
2d069c08 225
226 ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
227 if (ret) {
228 put_bh(bh);
229 return ERR_PTR(ret);
230 }
231 return bh;
fb265c9c
TT		 232}
233
8394a6ab 234struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
235 int op_flags)
236{
237 return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE);
238}
239
240struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
241 sector_t block)
242{
243 return __ext4_sb_bread_gfp(sb, block, 0, 0);
244}
245
5df1d412 246void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
247{
248 struct buffer_head *bh = sb_getblk_gfp(sb, block, 0);
249
250 if (likely(bh)) {
251 ext4_read_bh_lock(bh, REQ_RAHEAD, false);
252 brelse(bh);
253 }
fb265c9c
TT		 254}
255
d25425f8
DW		 256static int ext4_verify_csum_type(struct super_block *sb,
257 struct ext4_super_block *es)
258{
e2b911c5 259 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 260 return 1;
261
262 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
263}
264
a9c47317
DW		 265static __le32 ext4_superblock_csum(struct super_block *sb,
266 struct ext4_super_block *es)
267{
268 struct ext4_sb_info *sbi = EXT4_SB(sb);
269 int offset = offsetof(struct ext4_super_block, s_checksum);
270 __u32 csum;
271
272 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
273
274 return cpu_to_le32(csum);
275}
276
c197855e
SH		 277static int ext4_superblock_csum_verify(struct super_block *sb,
278 struct ext4_super_block *es)
a9c47317 279{
9aa5d32b 280 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 281 return 1;
282
283 return es->s_checksum == ext4_superblock_csum(sb, es);
284}
285
06db49e6 286void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 287{
06db49e6
TT		 288 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
289
9aa5d32b 290 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 291 return;
292
293 es->s_checksum = ext4_superblock_csum(sb, es);
294}
295
8fadc143
AR		 296ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
297 struct ext4_group_desc *bg)
bd81d8ee 298{
3a14589c 299 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 300 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 301 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 302}
303
8fadc143
AR		 304ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
305 struct ext4_group_desc *bg)
bd81d8ee 306{
5272f837 307 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 308 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 309 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 310}
311
8fadc143
AR		 312ext4_fsblk_t ext4_inode_table(struct super_block *sb,
313 struct ext4_group_desc *bg)
bd81d8ee 314{
5272f837 315 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 316 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 317 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 318}
319
021b65bb
TT		 320__u32 ext4_free_group_clusters(struct super_block *sb,
321 struct ext4_group_desc *bg)
560671a0
AK		 322{
323 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
324 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 325 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 326}
327
328__u32 ext4_free_inodes_count(struct super_block *sb,
329 struct ext4_group_desc *bg)
330{
331 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
332 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 333 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 334}
335
336__u32 ext4_used_dirs_count(struct super_block *sb,
337 struct ext4_group_desc *bg)
338{
339 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
340 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 341 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 342}
343
344__u32 ext4_itable_unused_count(struct super_block *sb,
345 struct ext4_group_desc *bg)
346{
347 return le16_to_cpu(bg->bg_itable_unused_lo) |
348 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 349 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 350}
351
8fadc143
AR		 352void ext4_block_bitmap_set(struct super_block *sb,
353 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 354{
3a14589c 355 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 356 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
357 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 358}
359
8fadc143
AR		 360void ext4_inode_bitmap_set(struct super_block *sb,
361 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 362{
5272f837 363 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 364 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
365 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 366}
367
8fadc143
AR		 368void ext4_inode_table_set(struct super_block *sb,
369 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 370{
5272f837 371 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 372 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
373 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 374}
375
021b65bb
TT		 376void ext4_free_group_clusters_set(struct super_block *sb,
377 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 378{
379 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
380 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
381 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
382}
383
384void ext4_free_inodes_set(struct super_block *sb,
385 struct ext4_group_desc *bg, __u32 count)
386{
387 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
388 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
389 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
390}
391
392void ext4_used_dirs_set(struct super_block *sb,
393 struct ext4_group_desc *bg, __u32 count)
394{
395 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
396 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
397 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
398}
399
400void ext4_itable_unused_set(struct super_block *sb,
401 struct ext4_group_desc *bg, __u32 count)
402{
403 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
404 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
405 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
406}
407
c92dc856 408static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)
6a0678a7 409{
6a0678a7
AB		 410 now = clamp_val(now, 0, (1ull << 40) - 1);
411
412 *lo = cpu_to_le32(lower_32_bits(now));
413 *hi = upper_32_bits(now);
414}
415
416static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
417{
418 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
419}
420#define ext4_update_tstamp(es, tstamp) \
c92dc856
JK		 421 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
422 ktime_get_real_seconds())
6a0678a7
AB		 423#define ext4_get_tstamp(es, tstamp) \
424 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
d3d1faf6 425
bdfe0cbd
TT		 426/*
427 * The del_gendisk() function uninitializes the disk-specific data
428 * structures, including the bdi structure, without telling anyone
429 * else. Once this happens, any attempt to call mark_buffer_dirty()
430 * (for example, by ext4_commit_super), will cause a kernel OOPS.
431 * This is a kludge to prevent these oops until we can put in a proper
432 * hook in del_gendisk() to inform the VFS and file system layers.
433 */
434static int block_device_ejected(struct super_block *sb)
435{
436 struct inode *bd_inode = sb->s_bdev->bd_inode;
437 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
438
439 return bdi->dev == NULL;
440}
441
18aadd47
BJ		 442static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
443{
444 struct super_block *sb = journal->j_private;
445 struct ext4_sb_info *sbi = EXT4_SB(sb);
446 int error = is_journal_aborted(journal);
5d3ee208 447 struct ext4_journal_cb_entry *jce;
18aadd47 448
5d3ee208 449 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 450
451 ext4_process_freed_data(sb, txn->t_tid);
452
18aadd47 453 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 454 while (!list_empty(&txn->t_private_list)) {
455 jce = list_entry(txn->t_private_list.next,
456 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 457 list_del_init(&jce->jce_list);
458 spin_unlock(&sbi->s_md_lock);
459 jce->jce_func(sb, jce, error);
460 spin_lock(&sbi->s_md_lock);
461 }
462 spin_unlock(&sbi->s_md_lock);
463}
1c13d5c0 464
afb585a9
MFO		 465/*
466 * This writepage callback for write_cache_pages()
467 * takes care of a few cases after page cleaning.
468 *
469 * write_cache_pages() already checks for dirty pages
470 * and calls clear_page_dirty_for_io(), which we want,
471 * to write protect the pages.
472 *
473 * However, we may have to redirty a page (see below.)
474 */
475static int ext4_journalled_writepage_callback(struct page *page,
476 struct writeback_control *wbc,
477 void *data)
478{
479 transaction_t *transaction = (transaction_t *) data;
480 struct buffer_head *bh, *head;
481 struct journal_head *jh;
482
483 bh = head = page_buffers(page);
484 do {
485 /*
486 * We have to redirty a page in these cases:
487 * 1) If buffer is dirty, it means the page was dirty because it
488 * contains a buffer that needs checkpointing. So the dirty bit
489 * needs to be preserved so that checkpointing writes the buffer
490 * properly.
491 * 2) If buffer is not part of the committing transaction
492 * (we may have just accidentally come across this buffer because
493 * inode range tracking is not exact) or if the currently running
494 * transaction already contains this buffer as well, dirty bit
495 * needs to be preserved so that the buffer gets writeprotected
496 * properly on running transaction's commit.
497 */
498 jh = bh2jh(bh);
499 if (buffer_dirty(bh) ||
500 (jh && (jh->b_transaction != transaction ||
501 jh->b_next_transaction))) {
502 redirty_page_for_writepage(wbc, page);
503 goto out;
504 }
505 } while ((bh = bh->b_this_page) != head);
506
507out:
508 return AOP_WRITEPAGE_ACTIVATE;
509}
510
511static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
512{
513 struct address_space *mapping = jinode->i_vfs_inode->i_mapping;
514 struct writeback_control wbc = {
515 .sync_mode = WB_SYNC_ALL,
516 .nr_to_write = LONG_MAX,
517 .range_start = jinode->i_dirty_start,
518 .range_end = jinode->i_dirty_end,
519 };
520
521 return write_cache_pages(mapping, &wbc,
522 ext4_journalled_writepage_callback,
523 jinode->i_transaction);
524}
525
526static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
527{
528 int ret;
529
530 if (ext4_should_journal_data(jinode->i_vfs_inode))
531 ret = ext4_journalled_submit_inode_data_buffers(jinode);
532 else
533 ret = jbd2_journal_submit_inode_data_buffers(jinode);
534
535 return ret;
536}
537
538static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
539{
540 int ret = 0;
541
542 if (!ext4_should_journal_data(jinode->i_vfs_inode))
543 ret = jbd2_journal_finish_inode_data_buffers(jinode);
544
545 return ret;
546}
547
1dc1097f
JK		 548static bool system_going_down(void)
549{
550 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
551 || system_state == SYSTEM_RESTART;
552}
553
02a7780e
JK		 554struct ext4_err_translation {
555 int code;
556 int errno;
557};
558
559#define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
560
561static struct ext4_err_translation err_translation[] = {
562 EXT4_ERR_TRANSLATE(EIO),
563 EXT4_ERR_TRANSLATE(ENOMEM),
564 EXT4_ERR_TRANSLATE(EFSBADCRC),
565 EXT4_ERR_TRANSLATE(EFSCORRUPTED),
566 EXT4_ERR_TRANSLATE(ENOSPC),
567 EXT4_ERR_TRANSLATE(ENOKEY),
568 EXT4_ERR_TRANSLATE(EROFS),
569 EXT4_ERR_TRANSLATE(EFBIG),
570 EXT4_ERR_TRANSLATE(EEXIST),
571 EXT4_ERR_TRANSLATE(ERANGE),
572 EXT4_ERR_TRANSLATE(EOVERFLOW),
573 EXT4_ERR_TRANSLATE(EBUSY),
574 EXT4_ERR_TRANSLATE(ENOTDIR),
575 EXT4_ERR_TRANSLATE(ENOTEMPTY),
576 EXT4_ERR_TRANSLATE(ESHUTDOWN),
577 EXT4_ERR_TRANSLATE(EFAULT),
578};
579
580static int ext4_errno_to_code(int errno)
581{
582 int i;
583
584 for (i = 0; i < ARRAY_SIZE(err_translation); i++)
585 if (err_translation[i].errno == errno)
586 return err_translation[i].code;
587 return EXT4_ERR_UNKNOWN;
588}
589
2d01ddc8
JK		 590static void save_error_info(struct super_block *sb, int error,
591 __u32 ino, __u64 block,
592 const char *func, unsigned int line)
40676623 593{
c92dc856 594 struct ext4_sb_info *sbi = EXT4_SB(sb);
40676623 595
02a7780e
JK		 596 /* We default to EFSCORRUPTED error... */
597 if (error == 0)
598 error = EFSCORRUPTED;
c92dc856
JK		 599
600 spin_lock(&sbi->s_error_lock);
601 sbi->s_add_error_count++;
602 sbi->s_last_error_code = error;
603 sbi->s_last_error_line = line;
604 sbi->s_last_error_ino = ino;
605 sbi->s_last_error_block = block;
606 sbi->s_last_error_func = func;
607 sbi->s_last_error_time = ktime_get_real_seconds();
608 if (!sbi->s_first_error_time) {
609 sbi->s_first_error_code = error;
610 sbi->s_first_error_line = line;
611 sbi->s_first_error_ino = ino;
612 sbi->s_first_error_block = block;
613 sbi->s_first_error_func = func;
614 sbi->s_first_error_time = sbi->s_last_error_time;
615 }
616 spin_unlock(&sbi->s_error_lock);
40676623
JK		 617}
618
ac27a0ec
DK		 619/* Deal with the reporting of failure conditions on a filesystem such as
620 * inconsistencies detected or read IO failures.
621 *
622 * On ext2, we can store the error state of the filesystem in the
617ba13b 623 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 624 * write ordering constraints on the superblock which prevent us from
625 * writing it out straight away; and given that the journal is about to
626 * be aborted, we can't rely on the current, or future, transactions to
627 * write out the superblock safely.
628 *
dab291af 629 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 630 * the journal instead. On recovery, the journal will complain about
ac27a0ec 631 * that error until we've noted it down and cleared it.
014c9caa
JK		 632 *
633 * If force_ro is set, we unconditionally force the filesystem into an
634 * ABORT|READONLY state, unless the error response on the fs has been set to
635 * panic in which case we take the easy way out and panic immediately. This is
636 * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
637 * at a critical moment in log management.
ac27a0ec 638 */
e789ca0c
JK		 639static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
640 __u32 ino, __u64 block,
641 const char *func, unsigned int line)
ac27a0ec 642{
b08070ec 643 journal_t *journal = EXT4_SB(sb)->s_journal;
2d01ddc8 644 bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);
b08070ec 645
e789ca0c 646 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
327eaf73
TT		 647 if (test_opt(sb, WARN_ON_ERROR))
648 WARN_ON_ONCE(1);
649
2d01ddc8
JK		 650 if (!continue_fs && !sb_rdonly(sb)) {
651 ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
652 if (journal)
653 jbd2_journal_abort(journal, -EIO);
654 }
655
656 if (!bdev_read_only(sb->s_bdev)) {
e789ca0c 657 save_error_info(sb, error, ino, block, func, line);
2d01ddc8
JK		 658 /*
659 * In case the fs should keep running, we need to writeout
660 * superblock through the journal. Due to lock ordering
661 * constraints, it may not be safe to do it right here so we
662 * defer superblock flushing to a workqueue.
663 */
664 if (continue_fs)
665 schedule_work(&EXT4_SB(sb)->s_error_work);
666 else
667 ext4_commit_super(sb);
668 }
e789ca0c 669
2d01ddc8 670 if (sb_rdonly(sb) || continue_fs)
ac27a0ec
DK		 671 return;
672
1dc1097f
JK		 673 /*
674 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
675 * could panic during 'reboot -f' as the underlying device got already
676 * disabled.
677 */
014c9caa 678 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
617ba13b 679 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 680 sb->s_id);
4327ba52 681 }
014c9caa
JK		 682 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
683 /*
684 * Make sure updated value of ->s_mount_flags will be visible before
685 * ->s_flags update
686 */
687 smp_wmb();
688 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 689}
690
c92dc856
JK		 691static void flush_stashed_error_work(struct work_struct *work)
692{
693 struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,
694 s_error_work);
2d01ddc8
JK		 695 journal_t *journal = sbi->s_journal;
696 handle_t *handle;
c92dc856 697
2d01ddc8
JK		 698 /*
699 * If the journal is still running, we have to write out superblock
700 * through the journal to avoid collisions of other journalled sb
701 * updates.
702 *
703 * We use directly jbd2 functions here to avoid recursing back into
704 * ext4 error handling code during handling of previous errors.
705 */
706 if (!sb_rdonly(sbi->s_sb) && journal) {
707 handle = jbd2_journal_start(journal, 1);
708 if (IS_ERR(handle))
709 goto write_directly;
710 if (jbd2_journal_get_write_access(handle, sbi->s_sbh)) {
711 jbd2_journal_stop(handle);
712 goto write_directly;
713 }
714 ext4_update_super(sbi->s_sb);
715 if (jbd2_journal_dirty_metadata(handle, sbi->s_sbh)) {
716 jbd2_journal_stop(handle);
717 goto write_directly;
718 }
719 jbd2_journal_stop(handle);
720 return;
721 }
722write_directly:
723 /*
724 * Write through journal failed. Write sb directly to get error info
725 * out and hope for the best.
726 */
4392fbc4 727 ext4_commit_super(sbi->s_sb);
ac27a0ec
DK		 728}
729
efbed4dc
TT		 730#define ext4_error_ratelimit(sb) \
731 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
732 "EXT4-fs error")
733
12062ddd 734void __ext4_error(struct super_block *sb, const char *function,
014c9caa 735 unsigned int line, bool force_ro, int error, __u64 block,
54d3adbc 736 const char *fmt, ...)
ac27a0ec 737{
0ff2ea7d 738 struct va_format vaf;
ac27a0ec
DK		 739 va_list args;
740
0db1ff22
TT		 741 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
742 return;
743
ccf0f32a 744 trace_ext4_error(sb, function, line);
efbed4dc
TT		 745 if (ext4_error_ratelimit(sb)) {
746 va_start(args, fmt);
747 vaf.fmt = fmt;
748 vaf.va = &args;
749 printk(KERN_CRIT
750 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
751 sb->s_id, function, line, current->comm, &vaf);
752 va_end(args);
753 }
e789ca0c 754 ext4_handle_error(sb, force_ro, error, 0, block, function, line);
ac27a0ec
DK		 755}
756
e7c96e8e 757void __ext4_error_inode(struct inode *inode, const char *function,
54d3adbc 758 unsigned int line, ext4_fsblk_t block, int error,
e7c96e8e 759 const char *fmt, ...)
273df556
FM		 760{
761 va_list args;
f7c21177 762 struct va_format vaf;
273df556 763
0db1ff22
TT		 764 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
765 return;
766
ccf0f32a 767 trace_ext4_error(inode->i_sb, function, line);
efbed4dc
TT		 768 if (ext4_error_ratelimit(inode->i_sb)) {
769 va_start(args, fmt);
770 vaf.fmt = fmt;
771 vaf.va = &args;
772 if (block)
773 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
774 "inode #%lu: block %llu: comm %s: %pV\n",
775 inode->i_sb->s_id, function, line, inode->i_ino,
776 block, current->comm, &vaf);
777 else
778 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
779 "inode #%lu: comm %s: %pV\n",
780 inode->i_sb->s_id, function, line, inode->i_ino,
781 current->comm, &vaf);
782 va_end(args);
783 }
e789ca0c
JK		 784 ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,
785 function, line);
273df556
FM		 786}
787
e7c96e8e
JP		 788void __ext4_error_file(struct file *file, const char *function,
789 unsigned int line, ext4_fsblk_t block,
790 const char *fmt, ...)
273df556
FM		 791{
792 va_list args;
f7c21177 793 struct va_format vaf;
496ad9aa 794 struct inode *inode = file_inode(file);
273df556
FM		 795 char pathname[80], *path;
796
0db1ff22
TT		 797 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
798 return;
799
ccf0f32a 800 trace_ext4_error(inode->i_sb, function, line);
efbed4dc 801 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 802 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 803 if (IS_ERR(path))
804 path = "(unknown)";
805 va_start(args, fmt);
806 vaf.fmt = fmt;
807 vaf.va = &args;
808 if (block)
809 printk(KERN_CRIT
810 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
811 "block %llu: comm %s: path %s: %pV\n",
812 inode->i_sb->s_id, function, line, inode->i_ino,
813 block, current->comm, path, &vaf);
814 else
815 printk(KERN_CRIT
816 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
817 "comm %s: path %s: %pV\n",
818 inode->i_sb->s_id, function, line, inode->i_ino,
819 current->comm, path, &vaf);
820 va_end(args);
821 }
e789ca0c
JK		 822 ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,
823 function, line);
273df556
FM		 824}
825
722887dd
TT		 826const char *ext4_decode_error(struct super_block *sb, int errno,
827 char nbuf[16])
ac27a0ec
DK		 828{
829 char *errstr = NULL;
830
831 switch (errno) {
6a797d27
DW		 832 case -EFSCORRUPTED:
833 errstr = "Corrupt filesystem";
834 break;
835 case -EFSBADCRC:
836 errstr = "Filesystem failed CRC";
837 break;
ac27a0ec
DK		 838 case -EIO:
839 errstr = "IO failure";
840 break;
841 case -ENOMEM:
842 errstr = "Out of memory";
843 break;
844 case -EROFS:
78f1ddbb
TT		 845 if (!sb || (EXT4_SB(sb)->s_journal &&
846 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 847 errstr = "Journal has aborted";
848 else
849 errstr = "Readonly filesystem";
850 break;
851 default:
852 /* If the caller passed in an extra buffer for unknown
853 * errors, textualise them now. Else we just return
854 * NULL. */
855 if (nbuf) {
856 /* Check for truncated error codes... */
857 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
858 errstr = nbuf;
859 }
860 break;
861 }
862
863 return errstr;
864}
865
617ba13b 866/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 867 * automatically and invokes the appropriate error response. */
868
c398eda0
TT		 869void __ext4_std_error(struct super_block *sb, const char *function,
870 unsigned int line, int errno)
ac27a0ec
DK		 871{
872 char nbuf[16];
873 const char *errstr;
874
0db1ff22
TT		 875 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
876 return;
877
ac27a0ec
DK		 878 /* Special case: if the error is EROFS, and we're not already
879 * inside a transaction, then there's really no point in logging
880 * an error. */
bc98a42c 881 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 882 return;
883
efbed4dc
TT		 884 if (ext4_error_ratelimit(sb)) {
885 errstr = ext4_decode_error(sb, errno, nbuf);
886 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
887 sb->s_id, function, line, errstr);
888 }
ac27a0ec 889
e789ca0c 890 ext4_handle_error(sb, false, -errno, 0, 0, function, line);
ac27a0ec
DK		 891}
892
e7c96e8e
JP		 893void __ext4_msg(struct super_block *sb,
894 const char *prefix, const char *fmt, ...)
b31e1552 895{
0ff2ea7d 896 struct va_format vaf;
b31e1552
ES		 897 va_list args;
898
1cf006ed 899 atomic_inc(&EXT4_SB(sb)->s_msg_count);
efbed4dc
TT		 900 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
901 return;
902
b31e1552 903 va_start(args, fmt);
0ff2ea7d
JP		 904 vaf.fmt = fmt;
905 vaf.va = &args;
906 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 907 va_end(args);
908}
909
1cf006ed
DM		 910static int ext4_warning_ratelimit(struct super_block *sb)
911{
912 atomic_inc(&EXT4_SB(sb)->s_warning_count);
913 return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
914 "EXT4-fs warning");
915}
b03a2f7e 916
12062ddd 917void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 918 unsigned int line, const char *fmt, ...)
ac27a0ec 919{
0ff2ea7d 920 struct va_format vaf;
ac27a0ec
DK		 921 va_list args;
922
b03a2f7e 923 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 924 return;
925
ac27a0ec 926 va_start(args, fmt);
0ff2ea7d
JP		 927 vaf.fmt = fmt;
928 vaf.va = &args;
929 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
930 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 931 va_end(args);
932}
933
b03a2f7e
AD		 934void __ext4_warning_inode(const struct inode *inode, const char *function,
935 unsigned int line, const char *fmt, ...)
936{
937 struct va_format vaf;
938 va_list args;
939
940 if (!ext4_warning_ratelimit(inode->i_sb))
941 return;
942
943 va_start(args, fmt);
944 vaf.fmt = fmt;
945 vaf.va = &args;
946 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
947 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
948 function, line, inode->i_ino, current->comm, &vaf);
949 va_end(args);
950}
951
e29136f8
TT		 952void __ext4_grp_locked_error(const char *function, unsigned int line,
953 struct super_block *sb, ext4_group_t grp,
954 unsigned long ino, ext4_fsblk_t block,
955 const char *fmt, ...)
5d1b1b3f
AK		 956__releases(bitlock)
957__acquires(bitlock)
958{
0ff2ea7d 959 struct va_format vaf;
5d1b1b3f 960 va_list args;
5d1b1b3f 961
0db1ff22
TT		 962 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
963 return;
964
ccf0f32a 965 trace_ext4_error(sb, function, line);
efbed4dc
TT		 966 if (ext4_error_ratelimit(sb)) {
967 va_start(args, fmt);
968 vaf.fmt = fmt;
969 vaf.va = &args;
970 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
971 sb->s_id, function, line, grp);
972 if (ino)
973 printk(KERN_CONT "inode %lu: ", ino);
974 if (block)
975 printk(KERN_CONT "block %llu:",
976 (unsigned long long) block);
977 printk(KERN_CONT "%pV\n", &vaf);
978 va_end(args);
979 }
5d1b1b3f
AK		 980
981 if (test_opt(sb, ERRORS_CONT)) {
c92dc856
JK		 982 if (test_opt(sb, WARN_ON_ERROR))
983 WARN_ON_ONCE(1);
e789ca0c 984 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2d01ddc8
JK		 985 if (!bdev_read_only(sb->s_bdev)) {
986 save_error_info(sb, EFSCORRUPTED, ino, block, function,
987 line);
e789ca0c 988 schedule_work(&EXT4_SB(sb)->s_error_work);
2d01ddc8 989 }
5d1b1b3f
AK		 990 return;
991 }
992 ext4_unlock_group(sb, grp);
e789ca0c 993 ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);
5d1b1b3f
AK		 994 /*
995 * We only get here in the ERRORS_RO case; relocking the group
996 * may be dangerous, but nothing bad will happen since the
997 * filesystem will have already been marked read/only and the
998 * journal has been aborted. We return 1 as a hint to callers
999 * who might what to use the return value from
25985edc 1000 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 1001 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1002 * aggressively from the ext4 function in question, with a
1003 * more appropriate error code.
1004 */
1005 ext4_lock_group(sb, grp);
1006 return;
1007}
1008
db79e6d1
WS		 1009void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
1010 ext4_group_t group,
1011 unsigned int flags)
1012{
1013 struct ext4_sb_info *sbi = EXT4_SB(sb);
1014 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1015 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
9af0b3d1
WS		 1016 int ret;
1017
1018 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
1019 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
1020 &grp->bb_state);
1021 if (!ret)
1022 percpu_counter_sub(&sbi->s_freeclusters_counter,
1023 grp->bb_free);
db79e6d1
WS		 1024 }
1025
9af0b3d1
WS		 1026 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
1027 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
1028 &grp->bb_state);
1029 if (!ret && gdp) {
db79e6d1
WS		 1030 int count;
1031
1032 count = ext4_free_inodes_count(sb, gdp);
1033 percpu_counter_sub(&sbi->s_freeinodes_counter,
1034 count);
1035 }
db79e6d1
WS		 1036 }
1037}
1038
617ba13b 1039void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 1040{
617ba13b 1041 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 1042
617ba13b 1043 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 1044 return;
1045
12062ddd 1046 ext4_warning(sb,
ac27a0ec
DK		 1047 "updating to rev %d because of new feature flag, "
1048 "running e2fsck is recommended",
617ba13b 1049 EXT4_DYNAMIC_REV);
ac27a0ec 1050
617ba13b
MC		 1051 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
1052 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
1053 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 1054 /* leave es->s_feature_*compat flags alone */
1055 /* es->s_uuid will be set by e2fsck if empty */
1056
1057 /*
1058 * The rest of the superblock fields should be zero, and if not it
1059 * means they are likely already in use, so leave them alone. We
1060 * can leave it up to e2fsck to clean up any inconsistencies there.
1061 */
1062}
1063
1064/*
1065 * Open the external journal device
1066 */
b31e1552 1067static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 1068{
1069 struct block_device *bdev;
ac27a0ec 1070
d4d77629 1071 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 1072 if (IS_ERR(bdev))
1073 goto fail;
1074 return bdev;
1075
1076fail:
ea3edd4d
CH		 1077 ext4_msg(sb, KERN_ERR,
1078 "failed to open journal device unknown-block(%u,%u) %ld",
1079 MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
ac27a0ec
DK		 1080 return NULL;
1081}
1082
1083/*
1084 * Release the journal device
1085 */
4385bab1 1086static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 1087{
4385bab1 1088 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 1089}
1090
4385bab1 1091static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 1092{
1093 struct block_device *bdev;
ee7ed3aa 1094 bdev = sbi->s_journal_bdev;
ac27a0ec 1095 if (bdev) {
4385bab1 1096 ext4_blkdev_put(bdev);
ee7ed3aa 1097 sbi->s_journal_bdev = NULL;
ac27a0ec 1098 }
ac27a0ec
DK		 1099}
1100
1101static inline struct inode *orphan_list_entry(struct list_head *l)
1102{
617ba13b 1103 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 1104}
1105
617ba13b 1106static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 1107{
1108 struct list_head *l;
1109
b31e1552
ES		 1110 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
1111 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 1112
1113 printk(KERN_ERR "sb_info orphan list:\n");
1114 list_for_each(l, &sbi->s_orphan) {
1115 struct inode *inode = orphan_list_entry(l);
1116 printk(KERN_ERR " "
1117 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1118 inode->i_sb->s_id, inode->i_ino, inode,
1119 inode->i_mode, inode->i_nlink,
1120 NEXT_ORPHAN(inode));
1121 }
1122}
1123
957153fc
JK		 1124#ifdef CONFIG_QUOTA
1125static int ext4_quota_off(struct super_block *sb, int type);
1126
1127static inline void ext4_quota_off_umount(struct super_block *sb)
1128{
1129 int type;
1130
964edf66
JK		 1131 /* Use our quota_off function to clear inode flags etc. */
1132 for (type = 0; type < EXT4_MAXQUOTAS; type++)
1133 ext4_quota_off(sb, type);
957153fc 1134}
33458eab
TT		 1135
1136/*
1137 * This is a helper function which is used in the mount/remount
1138 * codepaths (which holds s_umount) to fetch the quota file name.
1139 */
1140static inline char *get_qf_name(struct super_block *sb,
1141 struct ext4_sb_info *sbi,
1142 int type)
1143{
1144 return rcu_dereference_protected(sbi->s_qf_names[type],
1145 lockdep_is_held(&sb->s_umount));
1146}
957153fc
JK		 1147#else
1148static inline void ext4_quota_off_umount(struct super_block *sb)
1149{
1150}
1151#endif
1152
2b2d6d01 1153static void ext4_put_super(struct super_block *sb)
ac27a0ec 1154{
617ba13b
MC		 1155 struct ext4_sb_info *sbi = EXT4_SB(sb);
1156 struct ext4_super_block *es = sbi->s_es;
1d0c3924 1157 struct buffer_head **group_desc;
7c990728 1158 struct flex_groups **flex_groups;
97abd7d4 1159 int aborted = 0;
ef2cabf7 1160 int i, err;
ac27a0ec 1161
857ac889 1162 ext4_unregister_li_request(sb);
957153fc 1163 ext4_quota_off_umount(sb);
e0ccfd95 1164
c92dc856 1165 flush_work(&sbi->s_error_work);
2e8fa54e 1166 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 1167
5e47868f
RH		 1168 /*
1169 * Unregister sysfs before destroying jbd2 journal.
1170 * Since we could still access attr_journal_task attribute via sysfs
1171 * path which could have sbi->s_journal->j_task as NULL
1172 */
1173 ext4_unregister_sysfs(sb);
1174
0390131b 1175 if (sbi->s_journal) {
97abd7d4 1176 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 1177 err = jbd2_journal_destroy(sbi->s_journal);
1178 sbi->s_journal = NULL;
878520ac 1179 if ((err < 0) && !aborted) {
54d3adbc 1180 ext4_abort(sb, -err, "Couldn't clean up the journal");
878520ac 1181 }
0390131b 1182 }
d4edac31 1183
d3922a77 1184 ext4_es_unregister_shrinker(sbi);
9105bb14 1185 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 1186 ext4_release_system_zone(sb);
1187 ext4_mb_release(sb);
1188 ext4_ext_release(sb);
d4edac31 1189
bc98a42c 1190 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 1191 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 1192 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 1193 }
bc98a42c 1194 if (!sb_rdonly(sb))
4392fbc4 1195 ext4_commit_super(sb);
a8e25a83 1196
1d0c3924
TT		 1197 rcu_read_lock();
1198 group_desc = rcu_dereference(sbi->s_group_desc);
ac27a0ec 1199 for (i = 0; i < sbi->s_gdb_count; i++)
1d0c3924
TT		 1200 brelse(group_desc[i]);
1201 kvfree(group_desc);
7c990728
SJS		 1202 flex_groups = rcu_dereference(sbi->s_flex_groups);
1203 if (flex_groups) {
1204 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1205 kvfree(flex_groups[i]);
1206 kvfree(flex_groups);
1207 }
1d0c3924 1208 rcu_read_unlock();
57042651 1209 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 1210 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1211 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 1212 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
bbd55937 1213 percpu_free_rwsem(&sbi->s_writepages_rwsem);
ac27a0ec 1214#ifdef CONFIG_QUOTA
a2d4a646 1215 for (i = 0; i < EXT4_MAXQUOTAS; i++)
33458eab 1216 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 1217#endif
1218
1219 /* Debugging code just in case the in-memory inode orphan list
1220 * isn't empty. The on-disk one can be non-empty if we've
1221 * detected an error and taken the fs readonly, but the
1222 * in-memory list had better be clean by this point. */
1223 if (!list_empty(&sbi->s_orphan))
1224 dump_orphan_list(sb, sbi);
837c23fb 1225 ASSERT(list_empty(&sbi->s_orphan));
ac27a0ec 1226
89d96a6f 1227 sync_blockdev(sb->s_bdev);
f98393a6 1228 invalidate_bdev(sb->s_bdev);
ee7ed3aa 1229 if (sbi->s_journal_bdev && sbi->s_journal_bdev != sb->s_bdev) {
ac27a0ec
DK		 1230 /*
1231 * Invalidate the journal device's buffers. We don't want them
1232 * floating about in memory - the physical journal device may
1233 * hotswapped, and it breaks the `ro-after' testing code.
1234 */
ee7ed3aa
CX		 1235 sync_blockdev(sbi->s_journal_bdev);
1236 invalidate_bdev(sbi->s_journal_bdev);
617ba13b 1237 ext4_blkdev_remove(sbi);
ac27a0ec 1238 }
50c15df6
CX		 1239
1240 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1241 sbi->s_ea_inode_cache = NULL;
1242
1243 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1244 sbi->s_ea_block_cache = NULL;
1245
c5e06d10
JL		 1246 if (sbi->s_mmp_tsk)
1247 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 1248 brelse(sbi->s_sbh);
ac27a0ec 1249 sb->s_fs_info = NULL;
3197ebdb
TT		 1250 /*
1251 * Now that we are completely done shutting down the
1252 * superblock, we need to actually destroy the kobject.
1253 */
3197ebdb
TT		 1254 kobject_put(&sbi->s_kobj);
1255 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1256 if (sbi->s_chksum_driver)
1257 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1258 kfree(sbi->s_blockgroup_lock);
5e405595 1259 fs_put_dax(sbi->s_daxdev);
ac4acb1f 1260 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
c83ad55e 1261#ifdef CONFIG_UNICODE
f8f4acb6 1262 utf8_unload(sb->s_encoding);
c83ad55e 1263#endif
ac27a0ec 1264 kfree(sbi);
ac27a0ec
DK		 1265}
1266
e18b890b 1267static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1268
1269/*
1270 * Called inside transaction, so use GFP_NOFS
1271 */
617ba13b 1272static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1273{
617ba13b 1274 struct ext4_inode_info *ei;
ac27a0ec 1275
e6b4f8da 1276 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1277 if (!ei)
1278 return NULL;
0b8e58a1 1279
ee73f9a5 1280 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 1281 spin_lock_init(&ei->i_raw_lock);
c9de560d 1282 INIT_LIST_HEAD(&ei->i_prealloc_list);
27bc446e 1283 atomic_set(&ei->i_prealloc_active, 0);
c9de560d 1284 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1285 ext4_es_init_tree(&ei->i_es_tree);
1286 rwlock_init(&ei->i_es_lock);
edaa53ca 1287 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1288 ei->i_es_all_nr = 0;
edaa53ca 1289 ei->i_es_shk_nr = 0;
dd475925 1290 ei->i_es_shrink_lblk = 0;
d2a17637 1291 ei->i_reserved_data_blocks = 0;
d2a17637 1292 spin_lock_init(&(ei->i_block_reservation_lock));
1dc0aa46 1293 ext4_init_pending_tree(&ei->i_pending_tree);
a9e7f447
DM		 1294#ifdef CONFIG_QUOTA
1295 ei->i_reserved_quota = 0;
96c7e0d9 1296 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1297#endif
8aefcd55 1298 ei->jinode = NULL;
2e8fa54e 1299 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1300 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1301 ei->i_sync_tid = 0;
1302 ei->i_datasync_tid = 0;
e27f41e1 1303 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1304 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
aa75f4d3
HS		 1305 ext4_fc_init_inode(&ei->vfs_inode);
1306 mutex_init(&ei->i_fc_lock);
ac27a0ec
DK		 1307 return &ei->vfs_inode;
1308}
1309
7ff9c073
TT		 1310static int ext4_drop_inode(struct inode *inode)
1311{
1312 int drop = generic_drop_inode(inode);
1313
29b3692e
EB		 1314 if (!drop)
1315 drop = fscrypt_drop_inode(inode);
1316
7ff9c073
TT		 1317 trace_ext4_drop_inode(inode, drop);
1318 return drop;
1319}
1320
94053139 1321static void ext4_free_in_core_inode(struct inode *inode)
fa0d7e3d 1322{
2c58d548 1323 fscrypt_free_inode(inode);
aa75f4d3
HS		 1324 if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
1325 pr_warn("%s: inode %ld still in fc list",
1326 __func__, inode->i_ino);
1327 }
fa0d7e3d
NP		 1328 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1329}
1330
617ba13b 1331static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1332{
9f7dd93d 1333 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1334 ext4_msg(inode->i_sb, KERN_ERR,
1335 "Inode %lu (%p): orphan list check failed!",
1336 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1337 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1338 EXT4_I(inode), sizeof(struct ext4_inode_info),
1339 true);
1340 dump_stack();
1341 }
ac27a0ec
DK		 1342}
1343
51cc5068 1344static void init_once(void *foo)
ac27a0ec 1345{
617ba13b 1346 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1347
a35afb83 1348 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1349 init_rwsem(&ei->xattr_sem);
0e855ac8 1350 init_rwsem(&ei->i_data_sem);
ea3d7209 1351 init_rwsem(&ei->i_mmap_sem);
a35afb83 1352 inode_init_once(&ei->vfs_inode);
aa75f4d3 1353 ext4_fc_init_inode(&ei->vfs_inode);
ac27a0ec
DK		 1354}
1355
e67bc2b3 1356static int __init init_inodecache(void)
ac27a0ec 1357{
f8dd7c70
DW		 1358 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1359 sizeof(struct ext4_inode_info), 0,
1360 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1361 SLAB_ACCOUNT),
1362 offsetof(struct ext4_inode_info, i_data),
1363 sizeof_field(struct ext4_inode_info, i_data),
1364 init_once);
617ba13b 1365 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1366 return -ENOMEM;
1367 return 0;
1368}
1369
1370static void destroy_inodecache(void)
1371{
8c0a8537
KS		 1372 /*
1373 * Make sure all delayed rcu free inodes are flushed before we
1374 * destroy cache.
1375 */
1376 rcu_barrier();
617ba13b 1377 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1378}
1379
0930fcc1 1380void ext4_clear_inode(struct inode *inode)
ac27a0ec 1381{
aa75f4d3 1382 ext4_fc_del(inode);
0930fcc1 1383 invalidate_inode_buffers(inode);
dbd5768f 1384 clear_inode(inode);
27bc446e 1385 ext4_discard_preallocations(inode, 0);
51865fda 1386 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
f4c2d372 1387 dquot_drop(inode);
8aefcd55
TT		 1388 if (EXT4_I(inode)->jinode) {
1389 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1390 EXT4_I(inode)->jinode);
1391 jbd2_free_inode(EXT4_I(inode)->jinode);
1392 EXT4_I(inode)->jinode = NULL;
1393 }
3d204e24 1394 fscrypt_put_encryption_info(inode);
c93d8f88 1395 fsverity_cleanup_inode(inode);
ac27a0ec
DK		 1396}
1397
1b961ac0 1398static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1399 u64 ino, u32 generation)
ac27a0ec 1400{
ac27a0ec 1401 struct inode *inode;
ac27a0ec 1402
8a363970 1403 /*
ac27a0ec
DK		 1404 * Currently we don't know the generation for parent directory, so
1405 * a generation of 0 means "accept any"
1406 */
8a363970 1407 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1408 if (IS_ERR(inode))
1409 return ERR_CAST(inode);
1410 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1411 iput(inode);
1412 return ERR_PTR(-ESTALE);
1413 }
1b961ac0
CH		 1414
1415 return inode;
1416}
1417
1418static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1419 int fh_len, int fh_type)
1b961ac0
CH		 1420{
1421 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1422 ext4_nfs_get_inode);
1423}
1424
1425static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1426 int fh_len, int fh_type)
1b961ac0
CH		 1427{
1428 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1429 ext4_nfs_get_inode);
ac27a0ec
DK		 1430}
1431
fde87268
TT		 1432static int ext4_nfs_commit_metadata(struct inode *inode)
1433{
1434 struct writeback_control wbc = {
1435 .sync_mode = WB_SYNC_ALL
1436 };
1437
1438 trace_ext4_nfs_commit_metadata(inode);
1439 return ext4_write_inode(inode, &wbc);
1440}
1441
c39a7f84
TO		 1442/*
1443 * Try to release metadata pages (indirect blocks, directories) which are
1444 * mapped via the block device. Since these pages could have journal heads
1445 * which would prevent try_to_free_buffers() from freeing them, we must use
1446 * jbd2 layer's try_to_free_buffers() function to release them.
1447 */
0b8e58a1
AD		 1448static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1449 gfp_t wait)
c39a7f84
TO		 1450{
1451 journal_t *journal = EXT4_SB(sb)->s_journal;
1452
1453 WARN_ON(PageChecked(page));
1454 if (!page_has_buffers(page))
1455 return 0;
1456 if (journal)
529a781e 1457 return jbd2_journal_try_to_free_buffers(journal, page);
1458
c39a7f84
TO		 1459 return try_to_free_buffers(page);
1460}
1461
643fa961 1462#ifdef CONFIG_FS_ENCRYPTION
a7550b30
JK		 1463static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1464{
1465 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1466 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1467}
1468
a7550b30
JK		 1469static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1470 void *fs_data)
1471{
2f8f5e76 1472 handle_t *handle = fs_data;
c1a5d5f6 1473 int res, res2, credits, retries = 0;
2f8f5e76 1474
9ce0151a
EB		 1475 /*
1476 * Encrypting the root directory is not allowed because e2fsck expects
1477 * lost+found to exist and be unencrypted, and encrypting the root
1478 * directory would imply encrypting the lost+found directory as well as
1479 * the filename "lost+found" itself.
1480 */
1481 if (inode->i_ino == EXT4_ROOT_INO)
1482 return -EPERM;
2f8f5e76 1483
7d3e06a8
RZ		 1484 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1485 return -EINVAL;
1486
b383a73f
IW		 1487 if (ext4_test_inode_flag(inode, EXT4_INODE_DAX))
1488 return -EOPNOTSUPP;
1489
94840e3c
EB		 1490 res = ext4_convert_inline_data(inode);
1491 if (res)
1492 return res;
1493
2f8f5e76
EB		 1494 /*
1495 * If a journal handle was specified, then the encryption context is
1496 * being set on a new inode via inheritance and is part of a larger
1497 * transaction to create the inode. Otherwise the encryption context is
1498 * being set on an existing inode in its own transaction. Only in the
1499 * latter case should the "retry on ENOSPC" logic be used.
1500 */
a7550b30 1501
2f8f5e76
EB		 1502 if (handle) {
1503 res = ext4_xattr_set_handle(handle, inode,
1504 EXT4_XATTR_INDEX_ENCRYPTION,
1505 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1506 ctx, len, 0);
a7550b30
JK		 1507 if (!res) {
1508 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1509 ext4_clear_inode_state(inode,
1510 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1511 /*
2ee6a576
EB		 1512 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1513 * S_DAX may be disabled
a3caa24b 1514 */
043546e4 1515 ext4_set_inode_flags(inode, false);
a7550b30
JK		 1516 }
1517 return res;
1518 }
1519
b8cb5a54
TE		 1520 res = dquot_initialize(inode);
1521 if (res)
1522 return res;
2f8f5e76 1523retry:
af65207c
TE		 1524 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1525 &credits);
dec214d0
TE		 1526 if (res)
1527 return res;
1528
c1a5d5f6 1529 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1530 if (IS_ERR(handle))
1531 return PTR_ERR(handle);
1532
2f8f5e76
EB		 1533 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1534 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1535 ctx, len, 0);
a7550b30
JK		 1536 if (!res) {
1537 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1538 /*
1539 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1540 * S_DAX may be disabled
1541 */
043546e4 1542 ext4_set_inode_flags(inode, false);
a7550b30
JK		 1543 res = ext4_mark_inode_dirty(handle, inode);
1544 if (res)
1545 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1546 }
1547 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1548
1549 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1550 goto retry;
a7550b30
JK		 1551 if (!res)
1552 res = res2;
1553 return res;
1554}
1555
ac4acb1f 1556static const union fscrypt_policy *ext4_get_dummy_policy(struct super_block *sb)
a7550b30 1557{
ac4acb1f 1558 return EXT4_SB(sb)->s_dummy_enc_policy.policy;
a7550b30
JK		 1559}
1560
b925acb8
EB		 1561static bool ext4_has_stable_inodes(struct super_block *sb)
1562{
1563 return ext4_has_feature_stable_inodes(sb);
1564}
1565
1566static void ext4_get_ino_and_lblk_bits(struct super_block *sb,
1567 int *ino_bits_ret, int *lblk_bits_ret)
1568{
1569 *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count);
1570 *lblk_bits_ret = 8 * sizeof(ext4_lblk_t);
1571}
1572
6f69f0ed 1573static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1574 .key_prefix = "ext4:",
a7550b30 1575 .get_context = ext4_get_context,
a7550b30 1576 .set_context = ext4_set_context,
ac4acb1f 1577 .get_dummy_policy = ext4_get_dummy_policy,
a7550b30 1578 .empty_dir = ext4_empty_dir,
e12ee683 1579 .max_namelen = EXT4_NAME_LEN,
b925acb8
EB		 1580 .has_stable_inodes = ext4_has_stable_inodes,
1581 .get_ino_and_lblk_bits = ext4_get_ino_and_lblk_bits,
a7550b30 1582};
a7550b30
JK		 1583#endif
1584
ac27a0ec 1585#ifdef CONFIG_QUOTA
d6006186 1586static const char * const quotatypes[] = INITQFNAMES;
689c958c 1587#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1588
617ba13b
MC		 1589static int ext4_write_dquot(struct dquot *dquot);
1590static int ext4_acquire_dquot(struct dquot *dquot);
1591static int ext4_release_dquot(struct dquot *dquot);
1592static int ext4_mark_dquot_dirty(struct dquot *dquot);
1593static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1594static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1595 const struct path *path);
617ba13b
MC		 1596static int ext4_quota_on_mount(struct super_block *sb, int type);
1597static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1598 size_t len, loff_t off);
617ba13b 1599static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1600 const char *data, size_t len, loff_t off);
7c319d32
AK		 1601static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1602 unsigned int flags);
1603static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1604
96c7e0d9
JK		 1605static struct dquot **ext4_get_dquots(struct inode *inode)
1606{
1607 return EXT4_I(inode)->i_dquot;
1608}
1609
61e225dc 1610static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1611 .get_reserved_space = ext4_get_reserved_space,
1612 .write_dquot = ext4_write_dquot,
1613 .acquire_dquot = ext4_acquire_dquot,
1614 .release_dquot = ext4_release_dquot,
1615 .mark_dirty = ext4_mark_dquot_dirty,
1616 .write_info = ext4_write_info,
1617 .alloc_dquot = dquot_alloc,
1618 .destroy_dquot = dquot_destroy,
1619 .get_projid = ext4_get_projid,
1620 .get_inode_usage = ext4_get_inode_usage,
ebc11f7b 1621 .get_next_id = dquot_get_next_id,
ac27a0ec
DK		 1622};
1623
0d54b217 1624static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1625 .quota_on = ext4_quota_on,
ca0e05e4 1626 .quota_off = ext4_quota_off,
287a8095 1627 .quota_sync = dquot_quota_sync,
0a240339 1628 .get_state = dquot_get_state,
287a8095
CH		 1629 .set_info = dquot_set_dqinfo,
1630 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1631 .set_dqblk = dquot_set_dqblk,
1632 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1633};
1634#endif
1635
ee9b6d61 1636static const struct super_operations ext4_sops = {
617ba13b 1637 .alloc_inode = ext4_alloc_inode,
94053139 1638 .free_inode = ext4_free_in_core_inode,
617ba13b 1639 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1640 .write_inode = ext4_write_inode,
1641 .dirty_inode = ext4_dirty_inode,
7ff9c073 1642 .drop_inode = ext4_drop_inode,
0930fcc1 1643 .evict_inode = ext4_evict_inode,
617ba13b 1644 .put_super = ext4_put_super,
617ba13b 1645 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1646 .freeze_fs = ext4_freeze,
1647 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1648 .statfs = ext4_statfs,
1649 .remount_fs = ext4_remount,
617ba13b 1650 .show_options = ext4_show_options,
ac27a0ec 1651#ifdef CONFIG_QUOTA
617ba13b
MC		 1652 .quota_read = ext4_quota_read,
1653 .quota_write = ext4_quota_write,
96c7e0d9 1654 .get_dquots = ext4_get_dquots,
ac27a0ec 1655#endif
c39a7f84 1656 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1657};
1658
39655164 1659static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1660 .fh_to_dentry = ext4_fh_to_dentry,
1661 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1662 .get_parent = ext4_get_parent,
fde87268 1663 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1664};
1665
1666enum {
1667 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1668 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1669 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1670 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1671 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1672 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1673 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1674 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1675 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
4f74d15f 1676 Opt_inlinecrypt,
ac27a0ec 1677 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1678 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1679 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
9cb20f94
IW		 1680 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version,
1681 Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
327eaf73
TT		 1682 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1683 Opt_nowarn_on_error, Opt_mblk_io_submit,
670e9875 1684 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1685 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1686 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1687 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1688 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1689 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
99c880de 1690 Opt_prefetch_block_bitmaps,
8016e29f 1691#ifdef CONFIG_EXT4_DEBUG
99c880de 1692 Opt_fc_debug_max_replay, Opt_fc_debug_force
8016e29f 1693#endif
ac27a0ec
DK		 1694};
1695
a447c093 1696static const match_table_t tokens = {
ac27a0ec
DK		 1697 {Opt_bsd_df, "bsddf"},
1698 {Opt_minix_df, "minixdf"},
1699 {Opt_grpid, "grpid"},
1700 {Opt_grpid, "bsdgroups"},
1701 {Opt_nogrpid, "nogrpid"},
1702 {Opt_nogrpid, "sysvgroups"},
1703 {Opt_resgid, "resgid=%u"},
1704 {Opt_resuid, "resuid=%u"},
1705 {Opt_sb, "sb=%u"},
1706 {Opt_err_cont, "errors=continue"},
1707 {Opt_err_panic, "errors=panic"},
1708 {Opt_err_ro, "errors=remount-ro"},
1709 {Opt_nouid32, "nouid32"},
ac27a0ec 1710 {Opt_debug, "debug"},
72578c33
TT		 1711 {Opt_removed, "oldalloc"},
1712 {Opt_removed, "orlov"},
ac27a0ec
DK		 1713 {Opt_user_xattr, "user_xattr"},
1714 {Opt_nouser_xattr, "nouser_xattr"},
1715 {Opt_acl, "acl"},
1716 {Opt_noacl, "noacl"},
e3bb52ae 1717 {Opt_noload, "norecovery"},
5a916be1 1718 {Opt_noload, "noload"},
72578c33
TT		 1719 {Opt_removed, "nobh"},
1720 {Opt_removed, "bh"},
ac27a0ec 1721 {Opt_commit, "commit=%u"},
30773840
TT		 1722 {Opt_min_batch_time, "min_batch_time=%u"},
1723 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1724 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1725 {Opt_journal_path, "journal_path=%s"},
818d276c 1726 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1727 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1728 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1729 {Opt_abort, "abort"},
1730 {Opt_data_journal, "data=journal"},
1731 {Opt_data_ordered, "data=ordered"},
1732 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1733 {Opt_data_err_abort, "data_err=abort"},
1734 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1735 {Opt_offusrjquota, "usrjquota="},
1736 {Opt_usrjquota, "usrjquota=%s"},
1737 {Opt_offgrpjquota, "grpjquota="},
1738 {Opt_grpjquota, "grpjquota=%s"},
1739 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1740 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1741 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1742 {Opt_grpquota, "grpquota"},
1743 {Opt_noquota, "noquota"},
1744 {Opt_quota, "quota"},
1745 {Opt_usrquota, "usrquota"},
49da9392 1746 {Opt_prjquota, "prjquota"},
ac27a0ec 1747 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1748 {Opt_barrier, "barrier"},
1749 {Opt_nobarrier, "nobarrier"},
25ec56b5 1750 {Opt_i_version, "i_version"},
923ae0ff 1751 {Opt_dax, "dax"},
9cb20f94
IW		 1752 {Opt_dax_always, "dax=always"},
1753 {Opt_dax_inode, "dax=inode"},
1754 {Opt_dax_never, "dax=never"},
c9de560d 1755 {Opt_stripe, "stripe=%u"},
64769240 1756 {Opt_delalloc, "delalloc"},
327eaf73
TT		 1757 {Opt_warn_on_error, "warn_on_error"},
1758 {Opt_nowarn_on_error, "nowarn_on_error"},
a26f4992
TT		 1759 {Opt_lazytime, "lazytime"},
1760 {Opt_nolazytime, "nolazytime"},
670e9875 1761 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1762 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1763 {Opt_removed, "mblk_io_submit"},
1764 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1765 {Opt_block_validity, "block_validity"},
1766 {Opt_noblock_validity, "noblock_validity"},
240799cd 1767 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1768 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1769 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1770 {Opt_auto_da_alloc, "auto_da_alloc"},
1771 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc 1772 {Opt_dioread_nolock, "dioread_nolock"},
244adf64 1773 {Opt_dioread_lock, "nodioread_nolock"},
744692dc 1774 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1775 {Opt_discard, "discard"},
1776 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1777 {Opt_init_itable, "init_itable=%u"},
1778 {Opt_init_itable, "init_itable"},
1779 {Opt_noinit_itable, "noinit_itable"},
8016e29f 1780#ifdef CONFIG_EXT4_DEBUG
99c880de 1781 {Opt_fc_debug_force, "fc_debug_force"},
8016e29f
HS		 1782 {Opt_fc_debug_max_replay, "fc_debug_max_replay=%u"},
1783#endif
df981d03 1784 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
ed318a6c 1785 {Opt_test_dummy_encryption, "test_dummy_encryption=%s"},
6ddb2447 1786 {Opt_test_dummy_encryption, "test_dummy_encryption"},
4f74d15f 1787 {Opt_inlinecrypt, "inlinecrypt"},
cdb7ee4c
TE		 1788 {Opt_nombcache, "nombcache"},
1789 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
3d392b26 1790 {Opt_prefetch_block_bitmaps, "prefetch_block_bitmaps"},
c7198b9c
TT		 1791 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1792 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1793 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1794 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1795 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1796 {Opt_err, NULL},
ac27a0ec
DK		 1797};
1798
617ba13b 1799static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1800{
617ba13b 1801 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1802 char *options = (char *) *data;
1803
1804 if (!options || strncmp(options, "sb=", 3) != 0)
1805 return 1; /* Default location */
0b8e58a1 1806
ac27a0ec 1807 options += 3;
0b8e58a1 1808 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1809 sb_block = simple_strtoul(options, &options, 0);
1810 if (*options && *options != ',') {
4776004f 1811 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1812 (char *) *data);
1813 return 1;
1814 }
1815 if (*options == ',')
1816 options++;
1817 *data = (void *) options;
0b8e58a1 1818
ac27a0ec
DK		 1819 return sb_block;
1820}
1821
b3881f74 1822#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1823static const char deprecated_msg[] =
1824 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1825 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1826
56c50f11
DM		 1827#ifdef CONFIG_QUOTA
1828static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1829{
1830 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1831 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
03dafb5f 1832 int ret = -1;
56c50f11 1833
33458eab 1834 if (sb_any_quota_loaded(sb) && !old_qname) {
56c50f11
DM		 1835 ext4_msg(sb, KERN_ERR,
1836 "Cannot change journaled "
1837 "quota options when quota turned on");
57f73c2c 1838 return -1;
56c50f11 1839 }
e2b911c5 1840 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1841 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1842 "ignored when QUOTA feature is enabled");
1843 return 1;
262b4662 1844 }
56c50f11
DM		 1845 qname = match_strdup(args);
1846 if (!qname) {
1847 ext4_msg(sb, KERN_ERR,
1848 "Not enough memory for storing quotafile name");
57f73c2c 1849 return -1;
56c50f11 1850 }
33458eab
TT		 1851 if (old_qname) {
1852 if (strcmp(old_qname, qname) == 0)
03dafb5f
CG		 1853 ret = 1;
1854 else
1855 ext4_msg(sb, KERN_ERR,
1856 "%s quota file already specified",
1857 QTYPE2NAME(qtype));
1858 goto errout;
56c50f11 1859 }
03dafb5f 1860 if (strchr(qname, '/')) {
56c50f11
DM		 1861 ext4_msg(sb, KERN_ERR,
1862 "quotafile must be on filesystem root");
03dafb5f 1863 goto errout;
56c50f11 1864 }
33458eab 1865 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
fd8c37ec 1866 set_opt(sb, QUOTA);
56c50f11 1867 return 1;
03dafb5f
CG		 1868errout:
1869 kfree(qname);
1870 return ret;
56c50f11
DM		 1871}
1872
1873static int clear_qf_name(struct super_block *sb, int qtype)
1874{
1875
1876 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1877 char *old_qname = get_qf_name(sb, sbi, qtype);
56c50f11 1878
33458eab 1879 if (sb_any_quota_loaded(sb) && old_qname) {
56c50f11
DM		 1880 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1881 " when quota turned on");
57f73c2c 1882 return -1;
56c50f11 1883 }
33458eab
TT		 1884 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1885 synchronize_rcu();
1886 kfree(old_qname);
56c50f11
DM		 1887 return 1;
1888}
1889#endif
1890
26092bf5
TT		 1891#define MOPT_SET 0x0001
1892#define MOPT_CLEAR 0x0002
1893#define MOPT_NOSUPPORT 0x0004
1894#define MOPT_EXPLICIT 0x0008
1895#define MOPT_CLEAR_ERR 0x0010
1896#define MOPT_GTE0 0x0020
ac27a0ec 1897#ifdef CONFIG_QUOTA
26092bf5
TT		 1898#define MOPT_Q 0
1899#define MOPT_QFMT 0x0040
1900#else
1901#define MOPT_Q MOPT_NOSUPPORT
1902#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1903#endif
26092bf5 1904#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1905#define MOPT_NO_EXT2 0x0100
1906#define MOPT_NO_EXT3 0x0200
1907#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1908#define MOPT_STRING 0x0400
9cb20f94 1909#define MOPT_SKIP 0x0800
995a3ed6 1910#define MOPT_2 0x1000
26092bf5
TT		 1911
1912static const struct mount_opts {
1913 int token;
1914 int mount_opt;
1915 int flags;
1916} ext4_mount_opts[] = {
1917 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1918 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1919 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1920 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1921 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1922 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1923 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1924 MOPT_EXT4_ONLY | MOPT_SET},
1925 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1926 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1927 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1928 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1929 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1930 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1931 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1932 MOPT_EXT4_ONLY | MOPT_CLEAR},
327eaf73
TT		 1933 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1934 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
c6d3d56d
DW		 1935 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1936 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1937 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1938 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1939 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1940 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1941 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1942 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1943 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1944 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1945 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1946 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1947 MOPT_NO_EXT2},
8dc0aa8c 1948 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1949 MOPT_NO_EXT2},
26092bf5
TT		 1950 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1951 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1952 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1953 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1954 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1955 {Opt_commit, 0, MOPT_GTE0},
1956 {Opt_max_batch_time, 0, MOPT_GTE0},
1957 {Opt_min_batch_time, 0, MOPT_GTE0},
1958 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1959 {Opt_init_itable, 0, MOPT_GTE0},
9cb20f94
IW		 1960 {Opt_dax, EXT4_MOUNT_DAX_ALWAYS, MOPT_SET | MOPT_SKIP},
1961 {Opt_dax_always, EXT4_MOUNT_DAX_ALWAYS,
1962 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
1963 {Opt_dax_inode, EXT4_MOUNT2_DAX_INODE,
1964 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
1965 {Opt_dax_never, EXT4_MOUNT2_DAX_NEVER,
1966 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
26092bf5 1967 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1968 {Opt_resuid, 0, MOPT_GTE0},
1969 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1970 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1971 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1972 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1973 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1974 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1975 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1976 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1977 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1978 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1979#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1980 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1981 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1982#else
26092bf5
TT		 1983 {Opt_acl, 0, MOPT_NOSUPPORT},
1984 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1985#endif
26092bf5
TT		 1986 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1987 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1988 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1989 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1990 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1991 MOPT_SET | MOPT_Q},
1992 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1993 MOPT_SET | MOPT_Q},
49da9392
JK		 1994 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1995 MOPT_SET | MOPT_Q},
26092bf5 1996 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1997 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1998 MOPT_CLEAR | MOPT_Q},
174fe5ba
KX		 1999 {Opt_usrjquota, 0, MOPT_Q | MOPT_STRING},
2000 {Opt_grpjquota, 0, MOPT_Q | MOPT_STRING},
26092bf5
TT		 2001 {Opt_offusrjquota, 0, MOPT_Q},
2002 {Opt_offgrpjquota, 0, MOPT_Q},
2003 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
2004 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
2005 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 2006 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
ed318a6c 2007 {Opt_test_dummy_encryption, 0, MOPT_STRING},
cdb7ee4c 2008 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
3d392b26
TT		 2009 {Opt_prefetch_block_bitmaps, EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS,
2010 MOPT_SET},
99c880de 2011#ifdef CONFIG_EXT4_DEBUG
0f0672ff
HS		 2012 {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
2013 MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
8016e29f
HS		 2014 {Opt_fc_debug_max_replay, 0, MOPT_GTE0},
2015#endif
26092bf5
TT		 2016 {Opt_err, 0, 0}
2017};
2018
c83ad55e
GKB		 2019#ifdef CONFIG_UNICODE
2020static const struct ext4_sb_encodings {
2021 __u16 magic;
2022 char *name;
2023 char *version;
2024} ext4_sb_encoding_map[] = {
2025 {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
2026};
2027
2028static int ext4_sb_read_encoding(const struct ext4_super_block *es,
2029 const struct ext4_sb_encodings **encoding,
2030 __u16 *flags)
2031{
2032 __u16 magic = le16_to_cpu(es->s_encoding);
2033 int i;
2034
2035 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
2036 if (magic == ext4_sb_encoding_map[i].magic)
2037 break;
2038
2039 if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
2040 return -EINVAL;
2041
2042 *encoding = &ext4_sb_encoding_map[i];
2043 *flags = le16_to_cpu(es->s_encoding_flags);
2044
2045 return 0;
2046}
2047#endif
2048
ed318a6c
EB		 2049static int ext4_set_test_dummy_encryption(struct super_block *sb,
2050 const char *opt,
2051 const substring_t *arg,
2052 bool is_remount)
2053{
2054#ifdef CONFIG_FS_ENCRYPTION
2055 struct ext4_sb_info *sbi = EXT4_SB(sb);
2056 int err;
2057
2058 /*
2059 * This mount option is just for testing, and it's not worthwhile to
2060 * implement the extra complexity (e.g. RCU protection) that would be
2061 * needed to allow it to be set or changed during remount. We do allow
2062 * it to be specified during remount, but only if there is no change.
2063 */
ac4acb1f 2064 if (is_remount && !sbi->s_dummy_enc_policy.policy) {
ed318a6c
EB		 2065 ext4_msg(sb, KERN_WARNING,
2066 "Can't set test_dummy_encryption on remount");
2067 return -1;
2068 }
c8c868ab 2069 err = fscrypt_set_test_dummy_encryption(sb, arg->from,
ac4acb1f 2070 &sbi->s_dummy_enc_policy);
ed318a6c
EB		 2071 if (err) {
2072 if (err == -EEXIST)
2073 ext4_msg(sb, KERN_WARNING,
2074 "Can't change test_dummy_encryption on remount");
2075 else if (err == -EINVAL)
2076 ext4_msg(sb, KERN_WARNING,
2077 "Value of option \"%s\" is unrecognized", opt);
2078 else
2079 ext4_msg(sb, KERN_WARNING,
2080 "Error processing option \"%s\" [%d]",
2081 opt, err);
2082 return -1;
2083 }
2084 ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
2085#else
2086 ext4_msg(sb, KERN_WARNING,
2087 "Test dummy encryption mount option ignored");
2088#endif
2089 return 1;
2090}
2091
26092bf5
TT		 2092static int handle_mount_opt(struct super_block *sb, char *opt, int token,
2093 substring_t *args, unsigned long *journal_devnum,
2094 unsigned int *journal_ioprio, int is_remount)
2095{
2096 struct ext4_sb_info *sbi = EXT4_SB(sb);
2097 const struct mount_opts *m;
08cefc7a
EB		 2098 kuid_t uid;
2099 kgid_t gid;
26092bf5
TT		 2100 int arg = 0;
2101
57f73c2c
TT		 2102#ifdef CONFIG_QUOTA
2103 if (token == Opt_usrjquota)
2104 return set_qf_name(sb, USRQUOTA, &args[0]);
2105 else if (token == Opt_grpjquota)
2106 return set_qf_name(sb, GRPQUOTA, &args[0]);
2107 else if (token == Opt_offusrjquota)
2108 return clear_qf_name(sb, USRQUOTA);
2109 else if (token == Opt_offgrpjquota)
2110 return clear_qf_name(sb, GRPQUOTA);
2111#endif
26092bf5 2112 switch (token) {
f7048605
TT		 2113 case Opt_noacl:
2114 case Opt_nouser_xattr:
2115 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
2116 break;
26092bf5
TT		 2117 case Opt_sb:
2118 return 1; /* handled by get_sb_block() */
2119 case Opt_removed:
5f3633e3 2120 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 2121 return 1;
26092bf5 2122 case Opt_abort:
9b5f6c9b 2123 ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
26092bf5
TT		 2124 return 1;
2125 case Opt_i_version:
357fdad0 2126 sb->s_flags |= SB_I_VERSION;
26092bf5 2127 return 1;
a26f4992 2128 case Opt_lazytime:
1751e8a6 2129 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 2130 return 1;
2131 case Opt_nolazytime:
1751e8a6 2132 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 2133 return 1;
4f74d15f
EB		 2134 case Opt_inlinecrypt:
2135#ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
2136 sb->s_flags |= SB_INLINECRYPT;
2137#else
2138 ext4_msg(sb, KERN_ERR, "inline encryption not supported");
2139#endif
2140 return 1;
26092bf5
TT		 2141 }
2142
5f3633e3
JK		 2143 for (m = ext4_mount_opts; m->token != Opt_err; m++)
2144 if (token == m->token)
2145 break;
2146
2147 if (m->token == Opt_err) {
2148 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
2149 "or missing value", opt);
2150 return -1;
2151 }
2152
8dc0aa8c
TT		 2153 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
2154 ext4_msg(sb, KERN_ERR,
2155 "Mount option \"%s\" incompatible with ext2", opt);
2156 return -1;
2157 }
2158 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
2159 ext4_msg(sb, KERN_ERR,
2160 "Mount option \"%s\" incompatible with ext3", opt);
2161 return -1;
2162 }
2163
ad4eec61 2164 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 2165 return -1;
2166 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
2167 return -1;
c93cf2d7
DM		 2168 if (m->flags & MOPT_EXPLICIT) {
2169 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
2170 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 2171 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
2172 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 2173 } else
2174 return -1;
2175 }
5f3633e3
JK		 2176 if (m->flags & MOPT_CLEAR_ERR)
2177 clear_opt(sb, ERRORS_MASK);
2178 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
2179 ext4_msg(sb, KERN_ERR, "Cannot change quota "
2180 "options when quota turned on");
2181 return -1;
2182 }
2183
2184 if (m->flags & MOPT_NOSUPPORT) {
2185 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
2186 } else if (token == Opt_commit) {
2187 if (arg == 0)
2188 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
9ba55543 2189 else if (arg > INT_MAX / HZ) {
2190 ext4_msg(sb, KERN_ERR,
2191 "Invalid commit interval %d, "
2192 "must be smaller than %d",
2193 arg, INT_MAX / HZ);
2194 return -1;
2195 }
5f3633e3 2196 sbi->s_commit_interval = HZ * arg;
670e9875 2197 } else if (token == Opt_debug_want_extra_isize) {
9803387c
TT		 2198 if ((arg & 1) ||
2199 (arg < 4) ||
2200 (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
2201 ext4_msg(sb, KERN_ERR,
2202 "Invalid want_extra_isize %d", arg);
2203 return -1;
2204 }
670e9875 2205 sbi->s_want_extra_isize = arg;
5f3633e3 2206 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 2207 sbi->s_max_batch_time = arg;
2208 } else if (token == Opt_min_batch_time) {
2209 sbi->s_min_batch_time = arg;
2210 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 2211 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
2212 ext4_msg(sb, KERN_ERR,
2213 "EXT4-fs: inode_readahead_blks must be "
2214 "0 or a power of 2 smaller than 2^31");
26092bf5 2215 return -1;
5f3633e3
JK		 2216 }
2217 sbi->s_inode_readahead_blks = arg;
2218 } else if (token == Opt_init_itable) {
2219 set_opt(sb, INIT_INODE_TABLE);
2220 if (!args->from)
2221 arg = EXT4_DEF_LI_WAIT_MULT;
2222 sbi->s_li_wait_mult = arg;
2223 } else if (token == Opt_max_dir_size_kb) {
2224 sbi->s_max_dir_size_kb = arg;
8016e29f
HS		 2225#ifdef CONFIG_EXT4_DEBUG
2226 } else if (token == Opt_fc_debug_max_replay) {
2227 sbi->s_fc_debug_max_replay = arg;
2228#endif
5f3633e3
JK		 2229 } else if (token == Opt_stripe) {
2230 sbi->s_stripe = arg;
2231 } else if (token == Opt_resuid) {
2232 uid = make_kuid(current_user_ns(), arg);
2233 if (!uid_valid(uid)) {
2234 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 2235 return -1;
2236 }
5f3633e3
JK		 2237 sbi->s_resuid = uid;
2238 } else if (token == Opt_resgid) {
2239 gid = make_kgid(current_user_ns(), arg);
2240 if (!gid_valid(gid)) {
2241 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
2242 return -1;
2243 }
2244 sbi->s_resgid = gid;
2245 } else if (token == Opt_journal_dev) {
2246 if (is_remount) {
2247 ext4_msg(sb, KERN_ERR,
2248 "Cannot specify journal on remount");
2249 return -1;
2250 }
2251 *journal_devnum = arg;
ad4eec61
ES		 2252 } else if (token == Opt_journal_path) {
2253 char *journal_path;
2254 struct inode *journal_inode;
2255 struct path path;
2256 int error;
2257
2258 if (is_remount) {
2259 ext4_msg(sb, KERN_ERR,
2260 "Cannot specify journal on remount");
2261 return -1;
2262 }
2263 journal_path = match_strdup(&args[0]);
2264 if (!journal_path) {
2265 ext4_msg(sb, KERN_ERR, "error: could not dup "
2266 "journal device string");
2267 return -1;
2268 }
2269
2270 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
2271 if (error) {
2272 ext4_msg(sb, KERN_ERR, "error: could not find "
2273 "journal device path: error %d", error);
2274 kfree(journal_path);
2275 return -1;
2276 }
2277
2b0143b5 2278 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 2279 if (!S_ISBLK(journal_inode->i_mode)) {
2280 ext4_msg(sb, KERN_ERR, "error: journal path %s "
2281 "is not a block device", journal_path);
2282 path_put(&path);
2283 kfree(journal_path);
2284 return -1;
2285 }
2286
2287 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
2288 path_put(&path);
2289 kfree(journal_path);
5f3633e3
JK		 2290 } else if (token == Opt_journal_ioprio) {
2291 if (arg > 7) {
2292 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
2293 " (must be 0-7)");
2294 return -1;
2295 }
2296 *journal_ioprio =
2297 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447 2298 } else if (token == Opt_test_dummy_encryption) {
ed318a6c
EB		 2299 return ext4_set_test_dummy_encryption(sb, opt, &args[0],
2300 is_remount);
5f3633e3
JK		 2301 } else if (m->flags & MOPT_DATAJ) {
2302 if (is_remount) {
2303 if (!sbi->s_journal)
2304 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2305 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 2306 ext4_msg(sb, KERN_ERR,
26092bf5 2307 "Cannot change data mode on remount");
26092bf5 2308 return -1;
ac27a0ec 2309 }
26092bf5 2310 } else {
5f3633e3
JK		 2311 clear_opt(sb, DATA_FLAGS);
2312 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 2313 }
5f3633e3
JK		 2314#ifdef CONFIG_QUOTA
2315 } else if (m->flags & MOPT_QFMT) {
2316 if (sb_any_quota_loaded(sb) &&
2317 sbi->s_jquota_fmt != m->mount_opt) {
2318 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2319 "quota options when quota turned on");
2320 return -1;
2321 }
e2b911c5 2322 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 2323 ext4_msg(sb, KERN_INFO,
2324 "Quota format mount options ignored "
262b4662 2325 "when QUOTA feature is enabled");
c325a67c 2326 return 1;
262b4662 2327 }
5f3633e3 2328 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 2329#endif
9cb20f94
IW		 2330 } else if (token == Opt_dax || token == Opt_dax_always ||
2331 token == Opt_dax_inode || token == Opt_dax_never) {
ef83b6e8 2332#ifdef CONFIG_FS_DAX
9cb20f94
IW		 2333 switch (token) {
2334 case Opt_dax:
2335 case Opt_dax_always:
829b37b8
TT		 2336 if (is_remount &&
2337 (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2338 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2339 fail_dax_change_remount:
2340 ext4_msg(sb, KERN_ERR, "can't change "
2341 "dax mount option while remounting");
2342 return -1;
2343 }
2344 if (is_remount &&
2345 (test_opt(sb, DATA_FLAGS) ==
2346 EXT4_MOUNT_JOURNAL_DATA)) {
2347 ext4_msg(sb, KERN_ERR, "can't mount with "
2348 "both data=journal and dax");
2349 return -1;
2350 }
9cb20f94
IW		 2351 ext4_msg(sb, KERN_WARNING,
2352 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2353 sbi->s_mount_opt |= EXT4_MOUNT_DAX_ALWAYS;
2354 sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
2355 break;
2356 case Opt_dax_never:
829b37b8
TT		 2357 if (is_remount &&
2358 (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2359 (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS)))
2360 goto fail_dax_change_remount;
9cb20f94
IW		 2361 sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
2362 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
2363 break;
2364 case Opt_dax_inode:
829b37b8
TT		 2365 if (is_remount &&
2366 ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2367 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2368 !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE)))
2369 goto fail_dax_change_remount;
9cb20f94
IW		 2370 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
2371 sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
2372 /* Strictly for printing options */
2373 sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_INODE;
2374 break;
2375 }
ef83b6e8 2376#else
923ae0ff 2377 ext4_msg(sb, KERN_INFO, "dax option not supported");
9cb20f94
IW		 2378 sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
2379 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
923ae0ff 2380 return -1;
5f3633e3 2381#endif
7915a861
AN		 2382 } else if (token == Opt_data_err_abort) {
2383 sbi->s_mount_opt |= m->mount_opt;
2384 } else if (token == Opt_data_err_ignore) {
2385 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 2386 } else {
2387 if (!args->from)
2388 arg = 1;
2389 if (m->flags & MOPT_CLEAR)
2390 arg = !arg;
2391 else if (unlikely(!(m->flags & MOPT_SET))) {
2392 ext4_msg(sb, KERN_WARNING,
2393 "buggy handling of option %s", opt);
2394 WARN_ON(1);
2395 return -1;
2396 }
995a3ed6
HS		 2397 if (m->flags & MOPT_2) {
2398 if (arg != 0)
2399 sbi->s_mount_opt2 |= m->mount_opt;
2400 else
2401 sbi->s_mount_opt2 &= ~m->mount_opt;
2402 } else {
2403 if (arg != 0)
2404 sbi->s_mount_opt |= m->mount_opt;
2405 else
2406 sbi->s_mount_opt &= ~m->mount_opt;
2407 }
26092bf5 2408 }
5f3633e3 2409 return 1;
26092bf5
TT		 2410}
2411
2412static int parse_options(char *options, struct super_block *sb,
2413 unsigned long *journal_devnum,
2414 unsigned int *journal_ioprio,
2415 int is_remount)
2416{
1e1a76ed 2417 struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb);
33458eab 2418 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
26092bf5
TT		 2419 substring_t args[MAX_OPT_ARGS];
2420 int token;
2421
2422 if (!options)
2423 return 1;
2424
2425 while ((p = strsep(&options, ",")) != NULL) {
2426 if (!*p)
2427 continue;
2428 /*
2429 * Initialize args struct so we know whether arg was
2430 * found; some options take optional arguments.
2431 */
caecd0af 2432 args[0].to = args[0].from = NULL;
26092bf5
TT		 2433 token = match_token(p, tokens, args);
2434 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2435 journal_ioprio, is_remount) < 0)
2436 return 0;
ac27a0ec
DK		 2437 }
2438#ifdef CONFIG_QUOTA
49da9392
JK		 2439 /*
2440 * We do the test below only for project quotas. 'usrquota' and
2441 * 'grpquota' mount options are allowed even without quota feature
2442 * to support legacy quotas in quota files.
2443 */
2444 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2445 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2446 "Cannot enable project quota enforcement.");
2447 return 0;
2448 }
33458eab
TT		 2449 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2450 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2451 if (usr_qf_name || grp_qf_name) {
2452 if (test_opt(sb, USRQUOTA) && usr_qf_name)
fd8c37ec 2453 clear_opt(sb, USRQUOTA);
ac27a0ec 2454
33458eab 2455 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
fd8c37ec 2456 clear_opt(sb, GRPQUOTA);
ac27a0ec 2457
56c50f11 2458 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 2459 ext4_msg(sb, KERN_ERR, "old and new quota "
2460 "format mixing");
ac27a0ec
DK		 2461 return 0;
2462 }
2463
2464 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 2465 ext4_msg(sb, KERN_ERR, "journaled quota format "
2466 "not specified");
ac27a0ec
DK		 2467 return 0;
2468 }
ac27a0ec
DK		 2469 }
2470#endif
626b035b
RH		 2471 if (test_opt(sb, DIOREAD_NOLOCK)) {
2472 int blocksize =
2473 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2474 if (blocksize < PAGE_SIZE)
2475 ext4_msg(sb, KERN_WARNING, "Warning: mounting with an "
2476 "experimental mount option 'dioread_nolock' "
2477 "for blocksize < PAGE_SIZE");
2478 }
ac27a0ec
DK		 2479 return 1;
2480}
2481
2adf6da8
TT		 2482static inline void ext4_show_quota_options(struct seq_file *seq,
2483 struct super_block *sb)
2484{
2485#if defined(CONFIG_QUOTA)
2486 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2487 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2488
2489 if (sbi->s_jquota_fmt) {
2490 char *fmtname = "";
2491
2492 switch (sbi->s_jquota_fmt) {
2493 case QFMT_VFS_OLD:
2494 fmtname = "vfsold";
2495 break;
2496 case QFMT_VFS_V0:
2497 fmtname = "vfsv0";
2498 break;
2499 case QFMT_VFS_V1:
2500 fmtname = "vfsv1";
2501 break;
2502 }
2503 seq_printf(seq, ",jqfmt=%s", fmtname);
2504 }
2505
33458eab
TT		 2506 rcu_read_lock();
2507 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2508 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2509 if (usr_qf_name)
2510 seq_show_option(seq, "usrjquota", usr_qf_name);
2511 if (grp_qf_name)
2512 seq_show_option(seq, "grpjquota", grp_qf_name);
2513 rcu_read_unlock();
2adf6da8
TT		 2514#endif
2515}
2516
5a916be1
TT		 2517static const char *token2str(int token)
2518{
50df9fd5 2519 const struct match_token *t;
5a916be1
TT		 2520
2521 for (t = tokens; t->token != Opt_err; t++)
2522 if (t->token == token && !strchr(t->pattern, '='))
2523 break;
2524 return t->pattern;
2525}
2526
2adf6da8
TT		 2527/*
2528 * Show an option if
2529 * - it's set to a non-default value OR
2530 * - if the per-sb default is different from the global default
2531 */
66acdcf4
TT		 2532static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2533 int nodefs)
2adf6da8 2534{
2adf6da8
TT		 2535 struct ext4_sb_info *sbi = EXT4_SB(sb);
2536 struct ext4_super_block *es = sbi->s_es;
68afa7e0 2537 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
5a916be1 2538 const struct mount_opts *m;
66acdcf4 2539 char sep = nodefs ? '\n' : ',';
2adf6da8 2540
66acdcf4
TT		 2541#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2542#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2543
2544 if (sbi->s_sb_block != 1)
5a916be1
TT		 2545 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2546
2547 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2548 int want_set = m->flags & MOPT_SET;
2549 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
9cb20f94 2550 (m->flags & MOPT_CLEAR_ERR) || m->flags & MOPT_SKIP)
5a916be1 2551 continue;
68afa7e0 2552 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2553 continue; /* skip if same as the default */
2554 if ((want_set &&
2555 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2556 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2557 continue; /* select Opt_noFoo vs Opt_Foo */
2558 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2559 }
5a916be1 2560
08cefc7a 2561 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2562 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2563 SEQ_OPTS_PRINT("resuid=%u",
2564 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2565 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2566 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2567 SEQ_OPTS_PRINT("resgid=%u",
2568 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2569 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2570 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2571 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2572 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2573 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2574 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2575 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2576 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2577 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2578 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2579 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2580 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2581 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2582 if (sb->s_flags & SB_I_VERSION)
5a916be1 2583 SEQ_OPTS_PUTS("i_version");
66acdcf4 2584 if (nodefs || sbi->s_stripe)
5a916be1 2585 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0
TN		 2586 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2587 (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2588 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2589 SEQ_OPTS_PUTS("data=journal");
2590 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2591 SEQ_OPTS_PUTS("data=ordered");
2592 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2593 SEQ_OPTS_PUTS("data=writeback");
2594 }
66acdcf4
TT		 2595 if (nodefs ||
2596 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2597 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2598 sbi->s_inode_readahead_blks);
2adf6da8 2599
ceec0376 2600 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 2601 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2602 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2603 if (nodefs || sbi->s_max_dir_size_kb)
2604 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2605 if (test_opt(sb, DATA_ERR_ABORT))
2606 SEQ_OPTS_PUTS("data_err=abort");
ed318a6c
EB		 2607
2608 fscrypt_show_test_dummy_encryption(seq, sep, sb);
2adf6da8 2609
4f74d15f
EB		 2610 if (sb->s_flags & SB_INLINECRYPT)
2611 SEQ_OPTS_PUTS("inlinecrypt");
2612
9cb20f94
IW		 2613 if (test_opt(sb, DAX_ALWAYS)) {
2614 if (IS_EXT2_SB(sb))
2615 SEQ_OPTS_PUTS("dax");
2616 else
2617 SEQ_OPTS_PUTS("dax=always");
2618 } else if (test_opt2(sb, DAX_NEVER)) {
2619 SEQ_OPTS_PUTS("dax=never");
2620 } else if (test_opt2(sb, DAX_INODE)) {
2621 SEQ_OPTS_PUTS("dax=inode");
2622 }
2adf6da8 2623 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2624 return 0;
2625}
2626
66acdcf4
TT		 2627static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2628{
2629 return _ext4_show_options(seq, root->d_sb, 0);
2630}
2631
ebd173be 2632int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2633{
2634 struct super_block *sb = seq->private;
2635 int rc;
2636
bc98a42c 2637 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2638 rc = _ext4_show_options(seq, sb, 1);
2639 seq_puts(seq, "\n");
2640 return rc;
2641}
2642
617ba13b 2643static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2644 int read_only)
2645{
617ba13b 2646 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 2647 int err = 0;
ac27a0ec 2648
617ba13b 2649 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2650 ext4_msg(sb, KERN_ERR, "revision level too high, "
2651 "forcing read-only mode");
c89128a0 2652 err = -EROFS;
5adaccac 2653 goto done;
ac27a0ec
DK		 2654 }
2655 if (read_only)
281b5995 2656 goto done;
617ba13b 2657 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2658 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2659 "running e2fsck is recommended");
c8b459f4 2660 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2661 ext4_msg(sb, KERN_WARNING,
2662 "warning: mounting fs with errors, "
2663 "running e2fsck is recommended");
ed3ce80a 2664 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2665 le16_to_cpu(es->s_mnt_count) >=
2666 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2667 ext4_msg(sb, KERN_WARNING,
2668 "warning: maximal mount count reached, "
2669 "running e2fsck is recommended");
ac27a0ec 2670 else if (le32_to_cpu(es->s_checkinterval) &&
6a0678a7
AB		 2671 (ext4_get_tstamp(es, s_lastcheck) +
2672 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
b31e1552
ES		 2673 ext4_msg(sb, KERN_WARNING,
2674 "warning: checktime reached, "
2675 "running e2fsck is recommended");
0b8e58a1 2676 if (!sbi->s_journal)
0390131b 2677 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2678 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2679 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2680 le16_add_cpu(&es->s_mnt_count, 1);
6a0678a7 2681 ext4_update_tstamp(es, s_mtime);
0390131b 2682 if (sbi->s_journal)
e2b911c5 2683 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2684
4392fbc4 2685 err = ext4_commit_super(sb);
281b5995 2686done:
ac27a0ec 2687 if (test_opt(sb, DEBUG))
a9df9a49 2688 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2689 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2690 sb->s_blocksize,
2691 sbi->s_groups_count,
617ba13b
MC		 2692 EXT4_BLOCKS_PER_GROUP(sb),
2693 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2694 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2695
7abc52c2 2696 cleancache_init_fs(sb);
c89128a0 2697 return err;
ac27a0ec
DK		 2698}
2699
117fff10
TT		 2700int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2701{
2702 struct ext4_sb_info *sbi = EXT4_SB(sb);
7c990728 2703 struct flex_groups **old_groups, **new_groups;
37b0b6b8 2704 int size, i, j;
117fff10
TT		 2705
2706 if (!sbi->s_log_groups_per_flex)
2707 return 0;
2708
2709 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2710 if (size <= sbi->s_flex_groups_allocated)
2711 return 0;
2712
7c990728
SJS		 2713 new_groups = kvzalloc(roundup_pow_of_two(size *
2714 sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
117fff10 2715 if (!new_groups) {
7c990728
SJS		 2716 ext4_msg(sb, KERN_ERR,
2717 "not enough memory for %d flex group pointers", size);
117fff10
TT		 2718 return -ENOMEM;
2719 }
7c990728
SJS		 2720 for (i = sbi->s_flex_groups_allocated; i < size; i++) {
2721 new_groups[i] = kvzalloc(roundup_pow_of_two(
2722 sizeof(struct flex_groups)),
2723 GFP_KERNEL);
2724 if (!new_groups[i]) {
37b0b6b8
DC		 2725 for (j = sbi->s_flex_groups_allocated; j < i; j++)
2726 kvfree(new_groups[j]);
7c990728
SJS		 2727 kvfree(new_groups);
2728 ext4_msg(sb, KERN_ERR,
2729 "not enough memory for %d flex groups", size);
2730 return -ENOMEM;
2731 }
117fff10 2732 }
7c990728
SJS		 2733 rcu_read_lock();
2734 old_groups = rcu_dereference(sbi->s_flex_groups);
2735 if (old_groups)
2736 memcpy(new_groups, old_groups,
2737 (sbi->s_flex_groups_allocated *
2738 sizeof(struct flex_groups *)));
2739 rcu_read_unlock();
2740 rcu_assign_pointer(sbi->s_flex_groups, new_groups);
2741 sbi->s_flex_groups_allocated = size;
2742 if (old_groups)
2743 ext4_kvfree_array_rcu(old_groups);
117fff10
TT		 2744 return 0;
2745}
2746
772cb7c8
JS		 2747static int ext4_fill_flex_info(struct super_block *sb)
2748{
2749 struct ext4_sb_info *sbi = EXT4_SB(sb);
2750 struct ext4_group_desc *gdp = NULL;
7c990728 2751 struct flex_groups *fg;
772cb7c8 2752 ext4_group_t flex_group;
117fff10 2753 int i, err;
772cb7c8 2754
503358ae 2755 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2756 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2757 sbi->s_log_groups_per_flex = 0;
2758 return 1;
2759 }
2760
117fff10
TT		 2761 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2762 if (err)
9933fc0a 2763 goto failed;
772cb7c8 2764
772cb7c8 2765 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2766 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2767
2768 flex_group = ext4_flex_group(sbi, i);
7c990728
SJS		 2769 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
2770 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
90ba983f 2771 atomic64_add(ext4_free_group_clusters(sb, gdp),
7c990728
SJS		 2772 &fg->free_clusters);
2773 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
772cb7c8
JS		 2774 }
2775
2776 return 1;
2777failed:
2778 return 0;
2779}
2780
e2b911c5 2781static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2782 struct ext4_group_desc *gdp)
717d50e4 2783{
b47820ed 2784 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2785 __u16 crc = 0;
feb0ab32 2786 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2787 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2788
9aa5d32b 2789 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2790 /* Use new metadata_csum algorithm */
feb0ab32 2791 __u32 csum32;
b47820ed 2792 __u16 dummy_csum = 0;
feb0ab32 2793
feb0ab32
DW		 2794 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2795 sizeof(le_group));
b47820ed
DJ		 2796 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2797 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2798 sizeof(dummy_csum));
2799 offset += sizeof(dummy_csum);
2800 if (offset < sbi->s_desc_size)
2801 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2802 sbi->s_desc_size - offset);
feb0ab32
DW		 2803
2804 crc = csum32 & 0xFFFF;
2805 goto out;
717d50e4
AD		 2806 }
2807
feb0ab32 2808 /* old crc16 code */
e2b911c5 2809 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2810 return 0;
2811
feb0ab32
DW		 2812 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2813 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2814 crc = crc16(crc, (__u8 *)gdp, offset);
2815 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2816 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2817 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2818 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2819 crc = crc16(crc, (__u8 *)gdp + offset,
2820 le16_to_cpu(sbi->s_es->s_desc_size) -
2821 offset);
2822
2823out:
717d50e4
AD		 2824 return cpu_to_le16(crc);
2825}
2826
feb0ab32 2827int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2828 struct ext4_group_desc *gdp)
2829{
feb0ab32 2830 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2831 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2832 return 0;
2833
2834 return 1;
2835}
2836
feb0ab32
DW		 2837void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2838 struct ext4_group_desc *gdp)
2839{
2840 if (!ext4_has_group_desc_csum(sb))
2841 return;
e2b911c5 2842 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2843}
2844
ac27a0ec 2845/* Called at mount-time, super-block is locked */
bfff6873 2846static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2847 ext4_fsblk_t sb_block,
bfff6873 2848 ext4_group_t *first_not_zeroed)
ac27a0ec 2849{
617ba13b
MC		 2850 struct ext4_sb_info *sbi = EXT4_SB(sb);
2851 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2852 ext4_fsblk_t last_block;
44de022c 2853 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 2854 ext4_fsblk_t block_bitmap;
2855 ext4_fsblk_t inode_bitmap;
2856 ext4_fsblk_t inode_table;
ce421581 2857 int flexbg_flag = 0;
bfff6873 2858 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2859
e2b911c5 2860 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2861 flexbg_flag = 1;
2862
af5bc92d 2863 ext4_debug("Checking group descriptors");
ac27a0ec 2864
197cd65a
AM		 2865 for (i = 0; i < sbi->s_groups_count; i++) {
2866 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2867
ce421581 2868 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2869 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2870 else
2871 last_block = first_block +
617ba13b 2872 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2873
bfff6873
LC		 2874 if ((grp == sbi->s_groups_count) &&
2875 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2876 grp = i;
2877
8fadc143 2878 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2879 if (block_bitmap == sb_block) {
2880 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2881 "Block bitmap for group %u overlaps "
2882 "superblock", i);
18db4b4e
TT		 2883 if (!sb_rdonly(sb))
2884 return 0;
829fa70d 2885 }
77260807
TT		 2886 if (block_bitmap >= sb_block + 1 &&
2887 block_bitmap <= last_bg_block) {
2888 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2889 "Block bitmap for group %u overlaps "
2890 "block group descriptors", i);
2891 if (!sb_rdonly(sb))
2892 return 0;
2893 }
2b2d6d01 2894 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2895 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2896 "Block bitmap for group %u not in group "
b31e1552 2897 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2898 return 0;
2899 }
8fadc143 2900 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2901 if (inode_bitmap == sb_block) {
2902 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2903 "Inode bitmap for group %u overlaps "
2904 "superblock", i);
18db4b4e
TT		 2905 if (!sb_rdonly(sb))
2906 return 0;
829fa70d 2907 }
77260807
TT		 2908 if (inode_bitmap >= sb_block + 1 &&
2909 inode_bitmap <= last_bg_block) {
2910 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2911 "Inode bitmap for group %u overlaps "
2912 "block group descriptors", i);
2913 if (!sb_rdonly(sb))
2914 return 0;
2915 }
2b2d6d01 2916 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2917 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2918 "Inode bitmap for group %u not in group "
b31e1552 2919 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2920 return 0;
2921 }
8fadc143 2922 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2923 if (inode_table == sb_block) {
2924 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2925 "Inode table for group %u overlaps "
2926 "superblock", i);
18db4b4e
TT		 2927 if (!sb_rdonly(sb))
2928 return 0;
829fa70d 2929 }
77260807
TT		 2930 if (inode_table >= sb_block + 1 &&
2931 inode_table <= last_bg_block) {
2932 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2933 "Inode table for group %u overlaps "
2934 "block group descriptors", i);
2935 if (!sb_rdonly(sb))
2936 return 0;
2937 }
bd81d8ee 2938 if (inode_table < first_block ||
2b2d6d01 2939 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2940 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2941 "Inode table for group %u not in group "
b31e1552 2942 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2943 return 0;
2944 }
955ce5f5 2945 ext4_lock_group(sb, i);
feb0ab32 2946 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2947 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2948 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2949 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2950 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2951 if (!sb_rdonly(sb)) {
955ce5f5 2952 ext4_unlock_group(sb, i);
8a266467 2953 return 0;
7ee1ec4c 2954 }
717d50e4 2955 }
955ce5f5 2956 ext4_unlock_group(sb, i);
ce421581
JS		 2957 if (!flexbg_flag)
2958 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2959 }
bfff6873
LC		 2960 if (NULL != first_not_zeroed)
2961 *first_not_zeroed = grp;
ac27a0ec
DK		 2962 return 1;
2963}
2964
617ba13b 2965/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2966 * the superblock) which were deleted from all directories, but held open by
2967 * a process at the time of a crash. We walk the list and try to delete these
2968 * inodes at recovery time (only with a read-write filesystem).
2969 *
2970 * In order to keep the orphan inode chain consistent during traversal (in
2971 * case of crash during recovery), we link each inode into the superblock
2972 * orphan list_head and handle it the same way as an inode deletion during
2973 * normal operation (which journals the operations for us).
2974 *
2975 * We only do an iget() and an iput() on each inode, which is very safe if we
2976 * accidentally point at an in-use or already deleted inode. The worst that
2977 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2978 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2979 * e2fsck was run on this filesystem, and it must have already done the orphan
2980 * inode cleanup for us, so we can safely abort without any further action.
2981 */
2b2d6d01
TT		 2982static void ext4_orphan_cleanup(struct super_block *sb,
2983 struct ext4_super_block *es)
ac27a0ec
DK		 2984{
2985 unsigned int s_flags = sb->s_flags;
2c98eb5e 2986 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2987#ifdef CONFIG_QUOTA
95f1fda4 2988 int quota_update = 0;
ac27a0ec
DK		 2989 int i;
2990#endif
2991 if (!es->s_last_orphan) {
2992 jbd_debug(4, "no orphan inodes to clean up\n");
2993 return;
2994 }
2995
a8f48a95 2996 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2997 ext4_msg(sb, KERN_ERR, "write access "
2998 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2999 return;
3000 }
3001
d39195c3
AG		 3002 /* Check if feature set would not allow a r/w mount */
3003 if (!ext4_feature_set_ok(sb, 0)) {
3004 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
3005 "unknown ROCOMPAT features");
3006 return;
3007 }
3008
617ba13b 3009 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 3010 /* don't clear list on RO mount w/ errors */
1751e8a6 3011 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 3012 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 3013 "clearing orphan list.\n");
c25f9bc6
ES		 3014 es->s_last_orphan = 0;
3015 }
ac27a0ec
DK		 3016 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
3017 return;
3018 }
3019
1751e8a6 3020 if (s_flags & SB_RDONLY) {
b31e1552 3021 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 3022 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 3023 }
3024#ifdef CONFIG_QUOTA
3025 /* Needed for iput() to work correctly and not trash data */
1751e8a6 3026 sb->s_flags |= SB_ACTIVE;
95f1fda4 3027
3028 /*
3029 * Turn on quotas which were not enabled for read-only mounts if
3030 * filesystem has quota feature, so that they are updated correctly.
3031 */
1751e8a6 3032 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 3033 int ret = ext4_enable_quotas(sb);
3034
3035 if (!ret)
3036 quota_update = 1;
3037 else
3038 ext4_msg(sb, KERN_ERR,
3039 "Cannot turn on quotas: error %d", ret);
3040 }
3041
3042 /* Turn on journaled quotas used for old sytle */
a2d4a646 3043 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 3044 if (EXT4_SB(sb)->s_qf_names[i]) {
3045 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 3046
3047 if (!ret)
3048 quota_update = 1;
3049 else
b31e1552
ES		 3050 ext4_msg(sb, KERN_ERR,
3051 "Cannot turn on journaled "
95f1fda4 3052 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 3053 }
3054 }
3055#endif
3056
3057 while (es->s_last_orphan) {
3058 struct inode *inode;
3059
c65d5c6c
VN		 3060 /*
3061 * We may have encountered an error during cleanup; if
3062 * so, skip the rest.
3063 */
3064 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
3065 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
3066 es->s_last_orphan = 0;
3067 break;
3068 }
3069
97bd42b9
JB		 3070 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
3071 if (IS_ERR(inode)) {
ac27a0ec
DK		 3072 es->s_last_orphan = 0;
3073 break;
3074 }
3075
617ba13b 3076 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 3077 dquot_initialize(inode);
ac27a0ec 3078 if (inode->i_nlink) {
566370a2
PT		 3079 if (test_opt(sb, DEBUG))
3080 ext4_msg(sb, KERN_DEBUG,
3081 "%s: truncating inode %lu to %lld bytes",
3082 __func__, inode->i_ino, inode->i_size);
e5f8eab8 3083 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 3084 inode->i_ino, inode->i_size);
5955102c 3085 inode_lock(inode);
55f252c9 3086 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 3087 ret = ext4_truncate(inode);
3088 if (ret)
3089 ext4_std_error(inode->i_sb, ret);
5955102c 3090 inode_unlock(inode);
ac27a0ec
DK		 3091 nr_truncates++;
3092 } else {
566370a2
PT		 3093 if (test_opt(sb, DEBUG))
3094 ext4_msg(sb, KERN_DEBUG,
3095 "%s: deleting unreferenced inode %lu",
3096 __func__, inode->i_ino);
ac27a0ec
DK		 3097 jbd_debug(2, "deleting unreferenced inode %lu\n",
3098 inode->i_ino);
3099 nr_orphans++;
3100 }
3101 iput(inode); /* The delete magic happens here! */
3102 }
3103
2b2d6d01 3104#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 3105
3106 if (nr_orphans)
b31e1552
ES		 3107 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
3108 PLURAL(nr_orphans));
ac27a0ec 3109 if (nr_truncates)
b31e1552
ES		 3110 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
3111 PLURAL(nr_truncates));
ac27a0ec 3112#ifdef CONFIG_QUOTA
95f1fda4 3113 /* Turn off quotas if they were enabled for orphan cleanup */
3114 if (quota_update) {
3115 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
3116 if (sb_dqopt(sb)->files[i])
3117 dquot_quota_off(sb, i);
3118 }
ac27a0ec
DK		 3119 }
3120#endif
1751e8a6 3121 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 3122}
0b8e58a1 3123
cd2291a4
ES		 3124/*
3125 * Maximal extent format file size.
3126 * Resulting logical blkno at s_maxbytes must fit in our on-disk
3127 * extent format containers, within a sector_t, and within i_blocks
3128 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
3129 * so that won't be a limiting factor.
3130 *
f17722f9
LC		 3131 * However there is other limiting factor. We do store extents in the form
3132 * of starting block and length, hence the resulting length of the extent
3133 * covering maximum file size must fit into on-disk format containers as
3134 * well. Given that length is always by 1 unit bigger than max unit (because
3135 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
3136 *
cd2291a4
ES		 3137 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
3138 */
f287a1a5 3139static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 3140{
3141 loff_t res;
3142 loff_t upper_limit = MAX_LFS_FILESIZE;
3143
72deb455
CH		 3144 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
3145
3146 if (!has_huge_files) {
cd2291a4
ES		 3147 upper_limit = (1LL << 32) - 1;
3148
3149 /* total blocks in file system block size */
3150 upper_limit >>= (blkbits - 9);
3151 upper_limit <<= blkbits;
3152 }
3153
f17722f9
LC		 3154 /*
3155 * 32-bit extent-start container, ee_block. We lower the maxbytes
3156 * by one fs block, so ee_len can cover the extent of maximum file
3157 * size
3158 */
3159 res = (1LL << 32) - 1;
cd2291a4 3160 res <<= blkbits;
cd2291a4
ES		 3161
3162 /* Sanity check against vm- & vfs- imposed limits */
3163 if (res > upper_limit)
3164 res = upper_limit;
3165
3166 return res;
3167}
ac27a0ec 3168
ac27a0ec 3169/*
cd2291a4 3170 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 3171 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3172 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 3173 */
f287a1a5 3174static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 3175{
617ba13b 3176 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 3177 int meta_blocks;
3178 loff_t upper_limit;
0b8e58a1
AD		 3179 /* This is calculated to be the largest file size for a dense, block
3180 * mapped file such that the file's total number of 512-byte sectors,
3181 * including data and all indirect blocks, does not exceed (2^48 - 1).
3182 *
3183 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3184 * number of 512-byte sectors of the file.
0fc1b451
AK		 3185 */
3186
72deb455 3187 if (!has_huge_files) {
0fc1b451 3188 /*
72deb455
CH		 3189 * !has_huge_files or implies that the inode i_block field
3190 * represents total file blocks in 2^32 512-byte sectors ==
3191 * size of vfs inode i_blocks * 8
0fc1b451
AK		 3192 */
3193 upper_limit = (1LL << 32) - 1;
3194
3195 /* total blocks in file system block size */
3196 upper_limit >>= (bits - 9);
3197
3198 } else {
8180a562
AK		 3199 /*
3200 * We use 48 bit ext4_inode i_blocks
3201 * With EXT4_HUGE_FILE_FL set the i_blocks
3202 * represent total number of blocks in
3203 * file system block size
3204 */
0fc1b451
AK		 3205 upper_limit = (1LL << 48) - 1;
3206
0fc1b451
AK		 3207 }
3208
3209 /* indirect blocks */
3210 meta_blocks = 1;
3211 /* double indirect blocks */
3212 meta_blocks += 1 + (1LL << (bits-2));
3213 /* tripple indirect blocks */
3214 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
3215
3216 upper_limit -= meta_blocks;
3217 upper_limit <<= bits;
ac27a0ec
DK		 3218
3219 res += 1LL << (bits-2);
3220 res += 1LL << (2*(bits-2));
3221 res += 1LL << (3*(bits-2));
3222 res <<= bits;
3223 if (res > upper_limit)
3224 res = upper_limit;
0fc1b451
AK		 3225
3226 if (res > MAX_LFS_FILESIZE)
3227 res = MAX_LFS_FILESIZE;
3228
ac27a0ec
DK		 3229 return res;
3230}
3231
617ba13b 3232static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 3233 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 3234{
617ba13b 3235 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 3236 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 3237 int has_super = 0;
3238
3239 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3240
e2b911c5 3241 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 3242 return logical_sb_block + nr + 1;
ac27a0ec 3243 bg = sbi->s_desc_per_block * nr;
617ba13b 3244 if (ext4_bg_has_super(sb, bg))
ac27a0ec 3245 has_super = 1;
0b8e58a1 3246
bd63f6b0
DW		 3247 /*
3248 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3249 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
3250 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3251 * compensate.
3252 */
3253 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 3254 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 3255 has_super++;
3256
617ba13b 3257 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 3258}
3259
c9de560d
AT		 3260/**
3261 * ext4_get_stripe_size: Get the stripe size.
3262 * @sbi: In memory super block info
3263 *
3264 * If we have specified it via mount option, then
3265 * use the mount option value. If the value specified at mount time is
3266 * greater than the blocks per group use the super block value.
3267 * If the super block value is greater than blocks per group return 0.
3268 * Allocator needs it be less than blocks per group.
3269 *
3270 */
3271static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3272{
3273 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3274 unsigned long stripe_width =
3275 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 3276 int ret;
c9de560d
AT		 3277
3278 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 3279 ret = sbi->s_stripe;
5469d7c3 3280 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 3281 ret = stripe_width;
5469d7c3 3282 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 3283 ret = stride;
3284 else
3285 ret = 0;
c9de560d 3286
3eb08658
DE		 3287 /*
3288 * If the stripe width is 1, this makes no sense and
3289 * we set it to 0 to turn off stripe handling code.
3290 */
3291 if (ret <= 1)
3292 ret = 0;
c9de560d 3293
3eb08658 3294 return ret;
c9de560d 3295}
ac27a0ec 3296
a13fb1a4
ES		 3297/*
3298 * Check whether this filesystem can be mounted based on
3299 * the features present and the RDONLY/RDWR mount requested.
3300 * Returns 1 if this filesystem can be mounted as requested,
3301 * 0 if it cannot be.
3302 */
3303static int ext4_feature_set_ok(struct super_block *sb, int readonly)
3304{
e2b911c5 3305 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 3306 ext4_msg(sb, KERN_ERR,
3307 "Couldn't mount because of "
3308 "unsupported optional features (%x)",
3309 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3310 ~EXT4_FEATURE_INCOMPAT_SUPP));
3311 return 0;
3312 }
3313
c83ad55e
GKB		 3314#ifndef CONFIG_UNICODE
3315 if (ext4_has_feature_casefold(sb)) {
3316 ext4_msg(sb, KERN_ERR,
3317 "Filesystem with casefold feature cannot be "
3318 "mounted without CONFIG_UNICODE");
3319 return 0;
3320 }
3321#endif
3322
a13fb1a4
ES		 3323 if (readonly)
3324 return 1;
3325
e2b911c5 3326 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 3327 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 3328 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 3329 return 1;
3330 }
3331
a13fb1a4 3332 /* Check that feature set is OK for a read-write mount */
e2b911c5 3333 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 3334 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3335 "unsupported optional features (%x)",
3336 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3337 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3338 return 0;
3339 }
e2b911c5 3340 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 3341 ext4_msg(sb, KERN_ERR,
3342 "Can't support bigalloc feature without "
3343 "extents feature\n");
3344 return 0;
3345 }
7c319d32 3346
9db176bc 3347#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
d65d87a0
TT		 3348 if (!readonly && (ext4_has_feature_quota(sb) ||
3349 ext4_has_feature_project(sb))) {
7c319d32 3350 ext4_msg(sb, KERN_ERR,
d65d87a0 3351 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
689c958c
LX		 3352 return 0;
3353 }
7c319d32 3354#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 3355 return 1;
3356}
3357
66e61a9e
TT		 3358/*
3359 * This function is called once a day if we have errors logged
3360 * on the file system
3361 */
235699a8 3362static void print_daily_error_info(struct timer_list *t)
66e61a9e 3363{
235699a8
KC		 3364 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3365 struct super_block *sb = sbi->s_sb;
3366 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 3367
3368 if (es->s_error_count)
ae0f78de
TT		 3369 /* fsck newer than v1.41.13 is needed to clean this condition. */
3370 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 3371 le32_to_cpu(es->s_error_count));
3372 if (es->s_first_error_time) {
6a0678a7
AB		 3373 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3374 sb->s_id,
3375 ext4_get_tstamp(es, s_first_error_time),
66e61a9e
TT		 3376 (int) sizeof(es->s_first_error_func),
3377 es->s_first_error_func,
3378 le32_to_cpu(es->s_first_error_line));
3379 if (es->s_first_error_ino)
651e1c3b 3380 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3381 le32_to_cpu(es->s_first_error_ino));
3382 if (es->s_first_error_block)
651e1c3b 3383 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3384 le64_to_cpu(es->s_first_error_block));
651e1c3b 3385 printk(KERN_CONT "\n");
66e61a9e
TT		 3386 }
3387 if (es->s_last_error_time) {
6a0678a7
AB		 3388 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3389 sb->s_id,
3390 ext4_get_tstamp(es, s_last_error_time),
66e61a9e
TT		 3391 (int) sizeof(es->s_last_error_func),
3392 es->s_last_error_func,
3393 le32_to_cpu(es->s_last_error_line));
3394 if (es->s_last_error_ino)
651e1c3b 3395 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3396 le32_to_cpu(es->s_last_error_ino));
3397 if (es->s_last_error_block)
651e1c3b 3398 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3399 le64_to_cpu(es->s_last_error_block));
651e1c3b 3400 printk(KERN_CONT "\n");
66e61a9e
TT		 3401 }
3402 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3403}
3404
bfff6873
LC		 3405/* Find next suitable group and run ext4_init_inode_table */
3406static int ext4_run_li_request(struct ext4_li_request *elr)
3407{
3408 struct ext4_group_desc *gdp = NULL;
3d392b26
TT		 3409 struct super_block *sb = elr->lr_super;
3410 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3411 ext4_group_t group = elr->lr_next_group;
bfff6873 3412 unsigned long timeout = 0;
3d392b26 3413 unsigned int prefetch_ios = 0;
bfff6873
LC		 3414 int ret = 0;
3415
3d392b26
TT		 3416 if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
3417 elr->lr_next_group = ext4_mb_prefetch(sb, group,
3418 EXT4_SB(sb)->s_mb_prefetch, &prefetch_ios);
3419 if (prefetch_ios)
3420 ext4_mb_prefetch_fini(sb, elr->lr_next_group,
3421 prefetch_ios);
3422 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group,
3423 prefetch_ios);
3424 if (group >= elr->lr_next_group) {
3425 ret = 1;
3426 if (elr->lr_first_not_zeroed != ngroups &&
3427 !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3428 elr->lr_next_group = elr->lr_first_not_zeroed;
3429 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3430 ret = 0;
3431 }
3432 }
3433 return ret;
3434 }
bfff6873 3435
3d392b26 3436 for (; group < ngroups; group++) {
bfff6873
LC		 3437 gdp = ext4_get_group_desc(sb, group, NULL);
3438 if (!gdp) {
3439 ret = 1;
3440 break;
3441 }
3442
3443 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3444 break;
3445 }
3446
7f511862 3447 if (group >= ngroups)
bfff6873
LC		 3448 ret = 1;
3449
3450 if (!ret) {
3451 timeout = jiffies;
3452 ret = ext4_init_inode_table(sb, group,
3453 elr->lr_timeout ? 0 : 1);
3d392b26 3454 trace_ext4_lazy_itable_init(sb, group);
bfff6873 3455 if (elr->lr_timeout == 0) {
51ce6511 3456 timeout = (jiffies - timeout) *
3d392b26 3457 EXT4_SB(elr->lr_super)->s_li_wait_mult;
bfff6873
LC		 3458 elr->lr_timeout = timeout;
3459 }
3460 elr->lr_next_sched = jiffies + elr->lr_timeout;
3461 elr->lr_next_group = group + 1;
3462 }
bfff6873
LC		 3463 return ret;
3464}
3465
3466/*
3467 * Remove lr_request from the list_request and free the
4ed5c033 3468 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 3469 */
3470static void ext4_remove_li_request(struct ext4_li_request *elr)
3471{
bfff6873
LC		 3472 if (!elr)
3473 return;
3474
bfff6873 3475 list_del(&elr->lr_request);
3d392b26 3476 EXT4_SB(elr->lr_super)->s_li_request = NULL;
bfff6873
LC		 3477 kfree(elr);
3478}
3479
3480static void ext4_unregister_li_request(struct super_block *sb)
3481{
1bb933fb
LC		 3482 mutex_lock(&ext4_li_mtx);
3483 if (!ext4_li_info) {
3484 mutex_unlock(&ext4_li_mtx);
bfff6873 3485 return;
1bb933fb 3486 }
bfff6873
LC		 3487
3488 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3489 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3490 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3491 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3492}
3493
8f1f7453
ES		 3494static struct task_struct *ext4_lazyinit_task;
3495
bfff6873
LC		 3496/*
3497 * This is the function where ext4lazyinit thread lives. It walks
3498 * through the request list searching for next scheduled filesystem.
3499 * When such a fs is found, run the lazy initialization request
3500 * (ext4_rn_li_request) and keep track of the time spend in this
3501 * function. Based on that time we compute next schedule time of
3502 * the request. When walking through the list is complete, compute
3503 * next waking time and put itself into sleep.
3504 */
3505static int ext4_lazyinit_thread(void *arg)
3506{
3507 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3508 struct list_head *pos, *n;
3509 struct ext4_li_request *elr;
4ed5c033 3510 unsigned long next_wakeup, cur;
bfff6873
LC		 3511
3512 BUG_ON(NULL == eli);
3513
bfff6873
LC		 3514cont_thread:
3515 while (true) {
3516 next_wakeup = MAX_JIFFY_OFFSET;
3517
3518 mutex_lock(&eli->li_list_mtx);
3519 if (list_empty(&eli->li_request_list)) {
3520 mutex_unlock(&eli->li_list_mtx);
3521 goto exit_thread;
3522 }
bfff6873 3523 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3524 int err = 0;
3525 int progress = 0;
bfff6873
LC		 3526 elr = list_entry(pos, struct ext4_li_request,
3527 lr_request);
3528
e22834f0
DM		 3529 if (time_before(jiffies, elr->lr_next_sched)) {
3530 if (time_before(elr->lr_next_sched, next_wakeup))
3531 next_wakeup = elr->lr_next_sched;
3532 continue;
3533 }
3534 if (down_read_trylock(&elr->lr_super->s_umount)) {
3535 if (sb_start_write_trylock(elr->lr_super)) {
3536 progress = 1;
3537 /*
3538 * We hold sb->s_umount, sb can not
3539 * be removed from the list, it is
3540 * now safe to drop li_list_mtx
3541 */
3542 mutex_unlock(&eli->li_list_mtx);
3543 err = ext4_run_li_request(elr);
3544 sb_end_write(elr->lr_super);
3545 mutex_lock(&eli->li_list_mtx);
3546 n = pos->next;
b2c78cd0 3547 }
e22834f0
DM		 3548 up_read((&elr->lr_super->s_umount));
3549 }
3550 /* error, remove the lazy_init job */
3551 if (err) {
3552 ext4_remove_li_request(elr);
3553 continue;
3554 }
3555 if (!progress) {
3556 elr->lr_next_sched = jiffies +
3557 (prandom_u32()
3558 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3559 }
bfff6873
LC		 3560 if (time_before(elr->lr_next_sched, next_wakeup))
3561 next_wakeup = elr->lr_next_sched;
3562 }
3563 mutex_unlock(&eli->li_list_mtx);
3564
a0acae0e 3565 try_to_freeze();
bfff6873 3566
4ed5c033
LC		 3567 cur = jiffies;
3568 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3569 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3570 cond_resched();
3571 continue;
3572 }
3573
4ed5c033
LC		 3574 schedule_timeout_interruptible(next_wakeup - cur);
3575
8f1f7453
ES		 3576 if (kthread_should_stop()) {
3577 ext4_clear_request_list();
3578 goto exit_thread;
3579 }
bfff6873
LC		 3580 }
3581
3582exit_thread:
3583 /*
3584 * It looks like the request list is empty, but we need
3585 * to check it under the li_list_mtx lock, to prevent any
3586 * additions into it, and of course we should lock ext4_li_mtx
3587 * to atomically free the list and ext4_li_info, because at
3588 * this point another ext4 filesystem could be registering
3589 * new one.
3590 */
3591 mutex_lock(&ext4_li_mtx);
3592 mutex_lock(&eli->li_list_mtx);
3593 if (!list_empty(&eli->li_request_list)) {
3594 mutex_unlock(&eli->li_list_mtx);
3595 mutex_unlock(&ext4_li_mtx);
3596 goto cont_thread;
3597 }
3598 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3599 kfree(ext4_li_info);
3600 ext4_li_info = NULL;
3601 mutex_unlock(&ext4_li_mtx);
3602
3603 return 0;
3604}
3605
3606static void ext4_clear_request_list(void)
3607{
3608 struct list_head *pos, *n;
3609 struct ext4_li_request *elr;
3610
3611 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3612 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3613 elr = list_entry(pos, struct ext4_li_request,
3614 lr_request);
3615 ext4_remove_li_request(elr);
3616 }
3617 mutex_unlock(&ext4_li_info->li_list_mtx);
3618}
3619
3620static int ext4_run_lazyinit_thread(void)
3621{
8f1f7453
ES		 3622 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3623 ext4_li_info, "ext4lazyinit");
3624 if (IS_ERR(ext4_lazyinit_task)) {
3625 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3626 ext4_clear_request_list();
bfff6873
LC		 3627 kfree(ext4_li_info);
3628 ext4_li_info = NULL;
92b97816 3629 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3630 "initialization thread\n",
3631 err);
3632 return err;
3633 }
3634 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3635 return 0;
3636}
3637
3638/*
3639 * Check whether it make sense to run itable init. thread or not.
3640 * If there is at least one uninitialized inode table, return
3641 * corresponding group number, else the loop goes through all
3642 * groups and return total number of groups.
3643 */
3644static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3645{
3646 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3647 struct ext4_group_desc *gdp = NULL;
3648
8844618d
TT		 3649 if (!ext4_has_group_desc_csum(sb))
3650 return ngroups;
3651
bfff6873
LC		 3652 for (group = 0; group < ngroups; group++) {
3653 gdp = ext4_get_group_desc(sb, group, NULL);
3654 if (!gdp)
3655 continue;
3656
50122847 3657 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3658 break;
3659 }
3660
3661 return group;
3662}
3663
3664static int ext4_li_info_new(void)
3665{
3666 struct ext4_lazy_init *eli = NULL;
3667
3668 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3669 if (!eli)
3670 return -ENOMEM;
3671
bfff6873
LC		 3672 INIT_LIST_HEAD(&eli->li_request_list);
3673 mutex_init(&eli->li_list_mtx);
3674
bfff6873
LC		 3675 eli->li_state |= EXT4_LAZYINIT_QUIT;
3676
3677 ext4_li_info = eli;
3678
3679 return 0;
3680}
3681
3682static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3683 ext4_group_t start)
3684{
bfff6873 3685 struct ext4_li_request *elr;
bfff6873
LC		 3686
3687 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3688 if (!elr)
3689 return NULL;
3690
3691 elr->lr_super = sb;
3d392b26
TT		 3692 elr->lr_first_not_zeroed = start;
3693 if (test_opt(sb, PREFETCH_BLOCK_BITMAPS))
3694 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3695 else {
3696 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3697 elr->lr_next_group = start;
3698 }
bfff6873
LC		 3699
3700 /*
3701 * Randomize first schedule time of the request to
3702 * spread the inode table initialization requests
3703 * better.
3704 */
dd1f723b
TT		 3705 elr->lr_next_sched = jiffies + (prandom_u32() %
3706 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3707 return elr;
3708}
3709
7f511862
TT		 3710int ext4_register_li_request(struct super_block *sb,
3711 ext4_group_t first_not_zeroed)
bfff6873
LC		 3712{
3713 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3714 struct ext4_li_request *elr = NULL;
49598e04 3715 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3716 int ret = 0;
bfff6873 3717
7f511862 3718 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3719 if (sbi->s_li_request != NULL) {
3720 /*
3721 * Reset timeout so it can be computed again, because
3722 * s_li_wait_mult might have changed.
3723 */
3724 sbi->s_li_request->lr_timeout = 0;
7f511862 3725 goto out;
51ce6511 3726 }
bfff6873 3727
3d392b26
TT		 3728 if (!test_opt(sb, PREFETCH_BLOCK_BITMAPS) &&
3729 (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3730 !test_opt(sb, INIT_INODE_TABLE)))
7f511862 3731 goto out;
bfff6873
LC		 3732
3733 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3734 if (!elr) {
3735 ret = -ENOMEM;
3736 goto out;
3737 }
bfff6873
LC		 3738
3739 if (NULL == ext4_li_info) {
3740 ret = ext4_li_info_new();
3741 if (ret)
3742 goto out;
3743 }
3744
3745 mutex_lock(&ext4_li_info->li_list_mtx);
3746 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3747 mutex_unlock(&ext4_li_info->li_list_mtx);
3748
3749 sbi->s_li_request = elr;
46e4690b
TM		 3750 /*
3751 * set elr to NULL here since it has been inserted to
3752 * the request_list and the removal and free of it is
3753 * handled by ext4_clear_request_list from now on.
3754 */
3755 elr = NULL;
bfff6873
LC		 3756
3757 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3758 ret = ext4_run_lazyinit_thread();
3759 if (ret)
3760 goto out;
3761 }
bfff6873 3762out:
beed5ecb
NK		 3763 mutex_unlock(&ext4_li_mtx);
3764 if (ret)
bfff6873 3765 kfree(elr);
bfff6873
LC		 3766 return ret;
3767}
3768
3769/*
3770 * We do not need to lock anything since this is called on
3771 * module unload.
3772 */
3773static void ext4_destroy_lazyinit_thread(void)
3774{
3775 /*
3776 * If thread exited earlier
3777 * there's nothing to be done.
3778 */
8f1f7453 3779 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3780 return;
3781
8f1f7453 3782 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3783}
3784
25ed6e8a
DW		 3785static int set_journal_csum_feature_set(struct super_block *sb)
3786{
3787 int ret = 1;
3788 int compat, incompat;
3789 struct ext4_sb_info *sbi = EXT4_SB(sb);
3790
9aa5d32b 3791 if (ext4_has_metadata_csum(sb)) {
db9ee220 3792 /* journal checksum v3 */
25ed6e8a 3793 compat = 0;
db9ee220 3794 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3795 } else {
3796 /* journal checksum v1 */
3797 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3798 incompat = 0;
3799 }
3800
feb8c6d3
DW		 3801 jbd2_journal_clear_features(sbi->s_journal,
3802 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3803 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3804 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3805 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3806 ret = jbd2_journal_set_features(sbi->s_journal,
3807 compat, 0,
3808 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3809 incompat);
3810 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3811 ret = jbd2_journal_set_features(sbi->s_journal,
3812 compat, 0,
3813 incompat);
3814 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3815 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3816 } else {
feb8c6d3
DW		 3817 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3818 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3819 }
3820
3821 return ret;
3822}
3823
952fc18e
TT		 3824/*
3825 * Note: calculating the overhead so we can be compatible with
3826 * historical BSD practice is quite difficult in the face of
3827 * clusters/bigalloc. This is because multiple metadata blocks from
3828 * different block group can end up in the same allocation cluster.
3829 * Calculating the exact overhead in the face of clustered allocation
3830 * requires either O(all block bitmaps) in memory or O(number of block
3831 * groups**2) in time. We will still calculate the superblock for
3832 * older file systems --- and if we come across with a bigalloc file
3833 * system with zero in s_overhead_clusters the estimate will be close to
3834 * correct especially for very large cluster sizes --- but for newer
3835 * file systems, it's better to calculate this figure once at mkfs
3836 * time, and store it in the superblock. If the superblock value is
3837 * present (even for non-bigalloc file systems), we will use it.
3838 */
3839static int count_overhead(struct super_block *sb, ext4_group_t grp,
3840 char *buf)
3841{
3842 struct ext4_sb_info *sbi = EXT4_SB(sb);
3843 struct ext4_group_desc *gdp;
3844 ext4_fsblk_t first_block, last_block, b;
3845 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3846 int s, j, count = 0;
3847
e2b911c5 3848 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3849 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3850 sbi->s_itb_per_group + 2);
3851
952fc18e
TT		 3852 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3853 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3854 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3855 for (i = 0; i < ngroups; i++) {
3856 gdp = ext4_get_group_desc(sb, i, NULL);
3857 b = ext4_block_bitmap(sb, gdp);
3858 if (b >= first_block && b <= last_block) {
3859 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3860 count++;
3861 }
3862 b = ext4_inode_bitmap(sb, gdp);
3863 if (b >= first_block && b <= last_block) {
3864 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3865 count++;
3866 }
3867 b = ext4_inode_table(sb, gdp);
3868 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3869 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3870 int c = EXT4_B2C(sbi, b - first_block);
3871 ext4_set_bit(c, buf);
3872 count++;
3873 }
3874 if (i != grp)
3875 continue;
3876 s = 0;
3877 if (ext4_bg_has_super(sb, grp)) {
3878 ext4_set_bit(s++, buf);
3879 count++;
3880 }
c48ae41b
TT		 3881 j = ext4_bg_num_gdb(sb, grp);
3882 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3883 ext4_error(sb, "Invalid number of block group "
3884 "descriptor blocks: %d", j);
3885 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3886 }
c48ae41b
TT		 3887 count += j;
3888 for (; j > 0; j--)
3889 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3890 }
3891 if (!count)
3892 return 0;
3893 return EXT4_CLUSTERS_PER_GROUP(sb) -
3894 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3895}
3896
3897/*
3898 * Compute the overhead and stash it in sbi->s_overhead
3899 */
3900int ext4_calculate_overhead(struct super_block *sb)
3901{
3902 struct ext4_sb_info *sbi = EXT4_SB(sb);
3903 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3904 struct inode *j_inode;
3905 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3906 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3907 ext4_fsblk_t overhead = 0;
4fdb5543 3908 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3909
952fc18e
TT		 3910 if (!buf)
3911 return -ENOMEM;
3912
3913 /*
3914 * Compute the overhead (FS structures). This is constant
3915 * for a given filesystem unless the number of block groups
3916 * changes so we cache the previous value until it does.
3917 */
3918
3919 /*
3920 * All of the blocks before first_data_block are overhead
3921 */
3922 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3923
3924 /*
3925 * Add the overhead found in each block group
3926 */
3927 for (i = 0; i < ngroups; i++) {
3928 int blks;
3929
3930 blks = count_overhead(sb, i, buf);
3931 overhead += blks;
3932 if (blks)
3933 memset(buf, 0, PAGE_SIZE);
3934 cond_resched();
3935 }
3c816ded
EW		 3936
3937 /*
3938 * Add the internal journal blocks whether the journal has been
3939 * loaded or not
3940 */
ee7ed3aa 3941 if (sbi->s_journal && !sbi->s_journal_bdev)
ede7dc7f 3942 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
f1eec3b0
RH		 3943 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
3944 /* j_inum for internal journal is non-zero */
3c816ded
EW		 3945 j_inode = ext4_get_journal_inode(sb, j_inum);
3946 if (j_inode) {
3947 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3948 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3949 iput(j_inode);
3950 } else {
3951 ext4_msg(sb, KERN_ERR, "can't get journal size");
3952 }
3953 }
952fc18e
TT		 3954 sbi->s_overhead = overhead;
3955 smp_wmb();
3956 free_page((unsigned long) buf);
3957 return 0;
3958}
3959
b5799018 3960static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3961{
3962 ext4_fsblk_t resv_clusters;
b5799018 3963 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3964
30fac0f7
JK		 3965 /*
3966 * There's no need to reserve anything when we aren't using extents.
3967 * The space estimates are exact, there are no unwritten extents,
3968 * hole punching doesn't need new metadata... This is needed especially
3969 * to keep ext2/3 backward compatibility.
3970 */
e2b911c5 3971 if (!ext4_has_feature_extents(sb))
b5799018 3972 return;
27dd4385
LC		 3973 /*
3974 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3975 * This should cover the situations where we can not afford to run
3976 * out of space like for example punch hole, or converting
556615dc 3977 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3978 * allocation would require 1, or 2 blocks, higher numbers are
3979 * very rare.
3980 */
b5799018
TT		 3981 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3982 sbi->s_cluster_bits);
27dd4385
LC		 3983
3984 do_div(resv_clusters, 50);
3985 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3986
b5799018 3987 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3988}
3989
ca9b404f
RA		 3990static const char *ext4_quota_mode(struct super_block *sb)
3991{
3992#ifdef CONFIG_QUOTA
3993 if (!ext4_quota_capable(sb))
3994 return "none";
3995
3996 if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))
3997 return "journalled";
3998 else
3999 return "writeback";
4000#else
4001 return "disabled";
4002#endif
4003}
4004
2b2d6d01 4005static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 4006{
5e405595 4007 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 4008 char *orig_data = kstrdup(data, GFP_KERNEL);
1d0c3924 4009 struct buffer_head *bh, **group_desc;
617ba13b 4010 struct ext4_super_block *es = NULL;
5aee0f8a 4011 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
7c990728 4012 struct flex_groups **flex_groups;
617ba13b
MC		 4013 ext4_fsblk_t block;
4014 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 4015 ext4_fsblk_t logical_sb_block;
ac27a0ec 4016 unsigned long offset = 0;
ac27a0ec
DK		 4017 unsigned long journal_devnum = 0;
4018 unsigned long def_mount_opts;
4019 struct inode *root;
0390131b 4020 const char *descr;
dcc7dae3 4021 int ret = -ENOMEM;
281b5995 4022 int blocksize, clustersize;
4ec11028
TT		 4023 unsigned int db_count;
4024 unsigned int i;
ef5fd681 4025 int needs_recovery, has_huge_files;
bd81d8ee 4026 __u64 blocks_count;
07aa2ea1 4027 int err = 0;
b3881f74 4028 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 4029 ext4_group_t first_not_zeroed;
ac27a0ec 4030
5aee0f8a
TT		 4031 if ((data && !orig_data) || !sbi)
4032 goto out_free_base;
705895b6 4033
aed9eb1b 4034 sbi->s_daxdev = dax_dev;
705895b6
PE		 4035 sbi->s_blockgroup_lock =
4036 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 4037 if (!sbi->s_blockgroup_lock)
4038 goto out_free_base;
4039
ac27a0ec 4040 sb->s_fs_info = sbi;
2c0544b2 4041 sbi->s_sb = sb;
240799cd 4042 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 4043 sbi->s_sb_block = sb_block;
8446fe92
CH		 4044 sbi->s_sectors_written_start =
4045 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);
ac27a0ec 4046
9f6200bb 4047 /* Cleanup superblock name */
ec3904dc 4048 strreplace(sb->s_id, '/', '!');
9f6200bb 4049
07aa2ea1 4050 /* -EINVAL is default */
dcc7dae3 4051 ret = -EINVAL;
617ba13b 4052 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 4053 if (!blocksize) {
b31e1552 4054 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 4055 goto out_fail;
4056 }
4057
4058 /*
617ba13b 4059 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 4060 * block sizes. We need to calculate the offset from buffer start.
4061 */
617ba13b 4062 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 4063 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4064 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 4065 } else {
70bbb3e0 4066 logical_sb_block = sb_block;
ac27a0ec
DK		 4067 }
4068
8394a6ab 4069 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
4070 if (IS_ERR(bh)) {
b31e1552 4071 ext4_msg(sb, KERN_ERR, "unable to read superblock");
8394a6ab 4072 ret = PTR_ERR(bh);
ac27a0ec
DK		 4073 goto out_fail;
4074 }
4075 /*
4076 * Note: s_es must be initialized as soon as possible because
617ba13b 4077 * some ext4 macro-instructions depend on its value
ac27a0ec 4078 */
2716b802 4079 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 4080 sbi->s_es = es;
4081 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 4082 if (sb->s_magic != EXT4_SUPER_MAGIC)
4083 goto cantfind_ext4;
afc32f7e 4084 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 4085
feb0ab32 4086 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 4087 if (ext4_has_feature_metadata_csum(sb) &&
4088 ext4_has_feature_gdt_csum(sb))
363307e6 4089 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 4090 "redundant flags; please run fsck.");
4091
d25425f8
DW		 4092 /* Check for a known checksum algorithm */
4093 if (!ext4_verify_csum_type(sb, es)) {
4094 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4095 "unknown checksum algorithm.");
4096 silent = 1;
4097 goto cantfind_ext4;
4098 }
4099
0441984a 4100 /* Load the checksum driver */
a45403b5
TT		 4101 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
4102 if (IS_ERR(sbi->s_chksum_driver)) {
4103 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
4104 ret = PTR_ERR(sbi->s_chksum_driver);
4105 sbi->s_chksum_driver = NULL;
4106 goto failed_mount;
0441984a
DW		 4107 }
4108
a9c47317
DW		 4109 /* Check superblock checksum */
4110 if (!ext4_superblock_csum_verify(sb, es)) {
4111 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4112 "invalid superblock checksum. Run e2fsck?");
4113 silent = 1;
6a797d27 4114 ret = -EFSBADCRC;
a9c47317
DW		 4115 goto cantfind_ext4;
4116 }
4117
4118 /* Precompute checksum seed for all metadata */
e2b911c5 4119 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 4120 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 4121 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 4122 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
4123 sizeof(es->s_uuid));
4124
ac27a0ec
DK		 4125 /* Set defaults before we parse the mount options */
4126 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 4127 set_opt(sb, INIT_INODE_TABLE);
617ba13b 4128 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 4129 set_opt(sb, DEBUG);
87f26807 4130 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 4131 set_opt(sb, GRPID);
617ba13b 4132 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 4133 set_opt(sb, NO_UID32);
ea663336 4134 /* xattr user namespace & acls are now defaulted on */
ea663336 4135 set_opt(sb, XATTR_USER);
03010a33 4136#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 4137 set_opt(sb, POSIX_ACL);
2e7842b8 4138#endif
995a3ed6
HS		 4139 if (ext4_has_feature_fast_commit(sb))
4140 set_opt2(sb, JOURNAL_FAST_COMMIT);
98c1a759
DW		 4141 /* don't forget to enable journal_csum when metadata_csum is enabled. */
4142 if (ext4_has_metadata_csum(sb))
4143 set_opt(sb, JOURNAL_CHECKSUM);
4144
617ba13b 4145 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 4146 set_opt(sb, JOURNAL_DATA);
617ba13b 4147 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 4148 set_opt(sb, ORDERED_DATA);
617ba13b 4149 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 4150 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 4151
4152 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 4153 set_opt(sb, ERRORS_PANIC);
bb4f397a 4154 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 4155 set_opt(sb, ERRORS_CONT);
bb4f397a 4156 else
fd8c37ec 4157 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 4158 /* block_validity enabled by default; disable with noblock_validity */
4159 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 4160 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 4161 set_opt(sb, DISCARD);
ac27a0ec 4162
08cefc7a
EB		 4163 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
4164 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 4165 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
4166 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
4167 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 4168
8b67f04a 4169 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 4170 set_opt(sb, BARRIER);
ac27a0ec 4171
dd919b98
AK		 4172 /*
4173 * enable delayed allocation by default
4174 * Use -o nodelalloc to turn it off
4175 */
bc0b75f7 4176 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 4177 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 4178 set_opt(sb, DELALLOC);
dd919b98 4179
51ce6511
LC		 4180 /*
4181 * set default s_li_wait_mult for lazyinit, for the case there is
4182 * no mount option specified.
4183 */
4184 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
4185
c9200760
TT		 4186 if (le32_to_cpu(es->s_log_block_size) >
4187 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4f97a681 4188 ext4_msg(sb, KERN_ERR,
c9200760
TT		 4189 "Invalid log block size: %u",
4190 le32_to_cpu(es->s_log_block_size));
4f97a681
TT		 4191 goto failed_mount;
4192 }
c9200760
TT		 4193 if (le32_to_cpu(es->s_log_cluster_size) >
4194 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4f97a681 4195 ext4_msg(sb, KERN_ERR,
c9200760
TT		 4196 "Invalid log cluster size: %u",
4197 le32_to_cpu(es->s_log_cluster_size));
4f97a681
TT		 4198 goto failed_mount;
4199 }
4200
c9200760
TT		 4201 blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
4202
4203 if (blocksize == PAGE_SIZE)
4204 set_opt(sb, DIOREAD_NOLOCK);
4f97a681 4205
9803387c
TT		 4206 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4207 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4208 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4209 } else {
4210 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4211 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4212 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4213 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4214 sbi->s_first_ino);
4215 goto failed_mount;
4216 }
4217 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4218 (!is_power_of_2(sbi->s_inode_size)) ||
4219 (sbi->s_inode_size > blocksize)) {
4220 ext4_msg(sb, KERN_ERR,
4221 "unsupported inode size: %d",
4222 sbi->s_inode_size);
4f97a681 4223 ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
9803387c
TT		 4224 goto failed_mount;
4225 }
4226 /*
4227 * i_atime_extra is the last extra field available for
4228 * [acm]times in struct ext4_inode. Checking for that
4229 * field should suffice to ensure we have extra space
4230 * for all three.
4231 */
4232 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4233 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4234 sb->s_time_gran = 1;
4235 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4236 } else {
4237 sb->s_time_gran = NSEC_PER_SEC;
4238 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4239 }
4240 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4241 }
4242 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4243 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4244 EXT4_GOOD_OLD_INODE_SIZE;
4245 if (ext4_has_feature_extra_isize(sb)) {
4246 unsigned v, max = (sbi->s_inode_size -
4247 EXT4_GOOD_OLD_INODE_SIZE);
4248
4249 v = le16_to_cpu(es->s_want_extra_isize);
4250 if (v > max) {
4251 ext4_msg(sb, KERN_ERR,
4252 "bad s_want_extra_isize: %d", v);
4253 goto failed_mount;
4254 }
4255 if (sbi->s_want_extra_isize < v)
4256 sbi->s_want_extra_isize = v;
4257
4258 v = le16_to_cpu(es->s_min_extra_isize);
4259 if (v > max) {
4260 ext4_msg(sb, KERN_ERR,
4261 "bad s_min_extra_isize: %d", v);
4262 goto failed_mount;
4263 }
4264 if (sbi->s_want_extra_isize < v)
4265 sbi->s_want_extra_isize = v;
4266 }
4267 }
4268
5aee0f8a
TT		 4269 if (sbi->s_es->s_mount_opts[0]) {
4270 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
4271 sizeof(sbi->s_es->s_mount_opts),
4272 GFP_KERNEL);
4273 if (!s_mount_opts)
4274 goto failed_mount;
4275 if (!parse_options(s_mount_opts, sb, &journal_devnum,
4276 &journal_ioprio, 0)) {
4277 ext4_msg(sb, KERN_WARNING,
4278 "failed to parse options in superblock: %s",
4279 s_mount_opts);
4280 }
4281 kfree(s_mount_opts);
8b67f04a 4282 }
5a916be1 4283 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 4284 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 4285 &journal_ioprio, 0))
ac27a0ec
DK		 4286 goto failed_mount;
4287
c83ad55e 4288#ifdef CONFIG_UNICODE
f8f4acb6 4289 if (ext4_has_feature_casefold(sb) && !sb->s_encoding) {
c83ad55e
GKB		 4290 const struct ext4_sb_encodings *encoding_info;
4291 struct unicode_map *encoding;
4292 __u16 encoding_flags;
4293
4294 if (ext4_has_feature_encrypt(sb)) {
4295 ext4_msg(sb, KERN_ERR,
4296 "Can't mount with encoding and encryption");
4297 goto failed_mount;
4298 }
4299
4300 if (ext4_sb_read_encoding(es, &encoding_info,
4301 &encoding_flags)) {
4302 ext4_msg(sb, KERN_ERR,
4303 "Encoding requested by superblock is unknown");
4304 goto failed_mount;
4305 }
4306
4307 encoding = utf8_load(encoding_info->version);
4308 if (IS_ERR(encoding)) {
4309 ext4_msg(sb, KERN_ERR,
4310 "can't mount with superblock charset: %s-%s "
4311 "not supported by the kernel. flags: 0x%x.",
4312 encoding_info->name, encoding_info->version,
4313 encoding_flags);
4314 goto failed_mount;
4315 }
4316 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4317 "%s-%s with flags 0x%hx", encoding_info->name,
4318 encoding_info->version?:"\b", encoding_flags);
4319
f8f4acb6
DR		 4320 sb->s_encoding = encoding;
4321 sb->s_encoding_flags = encoding_flags;
c83ad55e
GKB		 4322 }
4323#endif
4324
56889787 4325 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
556e0319 4326 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!\n");
781c036b 4327 /* can't mount with both data=journal and dioread_nolock. */
244adf64 4328 clear_opt(sb, DIOREAD_NOLOCK);
556e0319 4329 clear_opt2(sb, JOURNAL_FAST_COMMIT);
56889787
TT		 4330 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4331 ext4_msg(sb, KERN_ERR, "can't mount with "
4332 "both data=journal and delalloc");
4333 goto failed_mount;
4334 }
fc626fe3 4335 if (test_opt(sb, DAX_ALWAYS)) {
923ae0ff
RZ		 4336 ext4_msg(sb, KERN_ERR, "can't mount with "
4337 "both data=journal and dax");
4338 goto failed_mount;
4339 }
73b92a2a
SK		 4340 if (ext4_has_feature_encrypt(sb)) {
4341 ext4_msg(sb, KERN_WARNING,
4342 "encrypted files will use data=ordered "
4343 "instead of data journaling mode");
4344 }
56889787
TT		 4345 if (test_opt(sb, DELALLOC))
4346 clear_opt(sb, DELALLOC);
001e4a87
TH		 4347 } else {
4348 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 4349 }
4350
1751e8a6
LT		 4351 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
4352 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 4353
617ba13b 4354 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 4355 (ext4_has_compat_features(sb) ||
4356 ext4_has_ro_compat_features(sb) ||
4357 ext4_has_incompat_features(sb)))
b31e1552
ES		 4358 ext4_msg(sb, KERN_WARNING,
4359 "feature flags set on rev 0 fs, "
4360 "running e2fsck is recommended");
469108ff 4361
ed3654eb
TT		 4362 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4363 set_opt2(sb, HURD_COMPAT);
e2b911c5 4364 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 4365 ext4_msg(sb, KERN_ERR,
4366 "The Hurd can't support 64-bit file systems");
4367 goto failed_mount;
4368 }
dec214d0
TE		 4369
4370 /*
4371 * ea_inode feature uses l_i_version field which is not
4372 * available in HURD_COMPAT mode.
4373 */
4374 if (ext4_has_feature_ea_inode(sb)) {
4375 ext4_msg(sb, KERN_ERR,
4376 "ea_inode feature is not supported for Hurd");
4377 goto failed_mount;
4378 }
ed3654eb
TT		 4379 }
4380
2035e776
TT		 4381 if (IS_EXT2_SB(sb)) {
4382 if (ext2_feature_set_ok(sb))
4383 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4384 "using the ext4 subsystem");
4385 else {
0d9366d6
ES		 4386 /*
4387 * If we're probing be silent, if this looks like
4388 * it's actually an ext[34] filesystem.
4389 */
4390 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4391 goto failed_mount;
2035e776
TT		 4392 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4393 "to feature incompatibilities");
4394 goto failed_mount;
4395 }
4396 }
4397
4398 if (IS_EXT3_SB(sb)) {
4399 if (ext3_feature_set_ok(sb))
4400 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4401 "using the ext4 subsystem");
4402 else {
0d9366d6
ES		 4403 /*
4404 * If we're probing be silent, if this looks like
4405 * it's actually an ext4 filesystem.
4406 */
4407 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4408 goto failed_mount;
2035e776
TT		 4409 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4410 "to feature incompatibilities");
4411 goto failed_mount;
4412 }
4413 }
4414
ac27a0ec
DK		 4415 /*
4416 * Check feature flags regardless of the revision level, since we
4417 * previously didn't change the revision level when setting the flags,
4418 * so there is a chance incompat flags are set on a rev 0 filesystem.
4419 */
bc98a42c 4420 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 4421 goto failed_mount;
a13fb1a4 4422
5b9554dc
TT		 4423 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4424 ext4_msg(sb, KERN_ERR,
4425 "Number of reserved GDT blocks insanely large: %d",
4426 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4427 goto failed_mount;
4428 }
4429
a8ab6d38
IW		 4430 if (bdev_dax_supported(sb->s_bdev, blocksize))
4431 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4432
fc626fe3 4433 if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
559db4c6
RZ		 4434 if (ext4_has_feature_inline_data(sb)) {
4435 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4436 " that may contain inline data");
361d24d4 4437 goto failed_mount;
559db4c6 4438 }
a8ab6d38 4439 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
24f3478d 4440 ext4_msg(sb, KERN_ERR,
361d24d4
ES		 4441 "DAX unsupported by block device.");
4442 goto failed_mount;
24f3478d 4443 }
923ae0ff
RZ		 4444 }
4445
e2b911c5 4446 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 4447 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4448 es->s_encryption_level);
4449 goto failed_mount;
4450 }
4451
ac27a0ec 4452 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 4453 /* Validate the filesystem blocksize */
4454 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 4455 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 4456 blocksize);
ac27a0ec
DK		 4457 goto failed_mount;
4458 }
4459
2b2d6d01 4460 brelse(bh);
70bbb3e0
AM		 4461 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4462 offset = do_div(logical_sb_block, blocksize);
8394a6ab 4463 bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
4464 if (IS_ERR(bh)) {
b31e1552
ES		 4465 ext4_msg(sb, KERN_ERR,
4466 "Can't read superblock on 2nd try");
8394a6ab 4467 ret = PTR_ERR(bh);
4468 bh = NULL;
ac27a0ec
DK		 4469 goto failed_mount;
4470 }
2716b802 4471 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 4472 sbi->s_es = es;
617ba13b 4473 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 4474 ext4_msg(sb, KERN_ERR,
4475 "Magic mismatch, very weird!");
ac27a0ec
DK		 4476 goto failed_mount;
4477 }
4478 }
4479
e2b911c5 4480 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 4481 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4482 has_huge_files);
4483 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 4484
0d1ee42f 4485 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 4486 if (ext4_has_feature_64bit(sb)) {
8fadc143 4487 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 4488 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 4489 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 4490 ext4_msg(sb, KERN_ERR,
4491 "unsupported descriptor size %lu",
0d1ee42f
AR		 4492 sbi->s_desc_size);
4493 goto failed_mount;
4494 }
4495 } else
4496 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 4497
ac27a0ec 4498 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 4499 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 4500
617ba13b 4501 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 4502 if (sbi->s_inodes_per_block == 0)
617ba13b 4503 goto cantfind_ext4;
cd6bb35b
TT		 4504 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4505 sbi->s_inodes_per_group > blocksize * 8) {
4506 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
b9c538da 4507 sbi->s_inodes_per_group);
cd6bb35b
TT		 4508 goto failed_mount;
4509 }
ac27a0ec
DK		 4510 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4511 sbi->s_inodes_per_block;
0d1ee42f 4512 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 4513 sbi->s_sbh = bh;
4514 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 4515 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4516 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 4517
2b2d6d01 4518 for (i = 0; i < 4; i++)
ac27a0ec
DK		 4519 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4520 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 4521 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 4522 i = le32_to_cpu(es->s_flags);
4523 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4524 sbi->s_hash_unsigned = 3;
4525 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 4526#ifdef __CHAR_UNSIGNED__
bc98a42c 4527 if (!sb_rdonly(sb))
23301410
TT		 4528 es->s_flags |=
4529 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4530 sbi->s_hash_unsigned = 3;
f99b2589 4531#else
bc98a42c 4532 if (!sb_rdonly(sb))
23301410
TT		 4533 es->s_flags |=
4534 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 4535#endif
23301410 4536 }
f99b2589 4537 }
ac27a0ec 4538
281b5995
TT		 4539 /* Handle clustersize */
4540 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
ef5fd681 4541 if (ext4_has_feature_bigalloc(sb)) {
281b5995
TT		 4542 if (clustersize < blocksize) {
4543 ext4_msg(sb, KERN_ERR,
4544 "cluster size (%d) smaller than "
4545 "block size (%d)", clustersize, blocksize);
4546 goto failed_mount;
4547 }
4548 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4549 le32_to_cpu(es->s_log_block_size);
4550 sbi->s_clusters_per_group =
4551 le32_to_cpu(es->s_clusters_per_group);
4552 if (sbi->s_clusters_per_group > blocksize * 8) {
4553 ext4_msg(sb, KERN_ERR,
4554 "#clusters per group too big: %lu",
4555 sbi->s_clusters_per_group);
4556 goto failed_mount;
4557 }
4558 if (sbi->s_blocks_per_group !=
4559 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4560 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4561 "clusters per group (%lu) inconsistent",
4562 sbi->s_blocks_per_group,
4563 sbi->s_clusters_per_group);
4564 goto failed_mount;
4565 }
4566 } else {
4567 if (clustersize != blocksize) {
bfe0a5f4
TT		 4568 ext4_msg(sb, KERN_ERR,
4569 "fragment/cluster size (%d) != "
4570 "block size (%d)", clustersize, blocksize);
4571 goto failed_mount;
281b5995
TT		 4572 }
4573 if (sbi->s_blocks_per_group > blocksize * 8) {
4574 ext4_msg(sb, KERN_ERR,
4575 "#blocks per group too big: %lu",
4576 sbi->s_blocks_per_group);
4577 goto failed_mount;
4578 }
4579 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4580 sbi->s_cluster_bits = 0;
ac27a0ec 4581 }
281b5995
TT		 4582 sbi->s_cluster_ratio = clustersize / blocksize;
4583
960fd856
TT		 4584 /* Do we have standard group size of clustersize * 8 blocks ? */
4585 if (sbi->s_blocks_per_group == clustersize << 3)
4586 set_opt2(sb, STD_GROUP_SIZE);
4587
bf43d84b
ES		 4588 /*
4589 * Test whether we have more sectors than will fit in sector_t,
4590 * and whether the max offset is addressable by the page cache.
4591 */
5a9ae68a 4592 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 4593 ext4_blocks_count(es));
5a9ae68a 4594 if (err) {
b31e1552 4595 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 4596 " too large to mount safely on this system");
ac27a0ec
DK		 4597 goto failed_mount;
4598 }
4599
617ba13b
MC		 4600 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4601 goto cantfind_ext4;
e7c95593 4602
0f2ddca6
FTN		 4603 /* check blocks count against device size */
4604 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4605 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 4606 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4607 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 4608 ext4_blocks_count(es), blocks_count);
4609 goto failed_mount;
4610 }
4611
0b8e58a1
AD		 4612 /*
4613 * It makes no sense for the first data block to be beyond the end
4614 * of the filesystem.
4615 */
4616 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 4617 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 4618 "block %u is beyond end of filesystem (%llu)",
4619 le32_to_cpu(es->s_first_data_block),
4620 ext4_blocks_count(es));
e7c95593
ES		 4621 goto failed_mount;
4622 }
bfe0a5f4
TT		 4623 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4624 (sbi->s_cluster_ratio == 1)) {
4625 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4626 "block is 0 with a 1k block and cluster size");
4627 goto failed_mount;
4628 }
4629
bd81d8ee
LV		 4630 blocks_count = (ext4_blocks_count(es) -
4631 le32_to_cpu(es->s_first_data_block) +
4632 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4633 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 4634 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
df41460a 4635 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4ec11028 4636 "(block count %llu, first data block %u, "
df41460a 4637 "blocks per group %lu)", blocks_count,
4ec11028
TT		 4638 ext4_blocks_count(es),
4639 le32_to_cpu(es->s_first_data_block),
4640 EXT4_BLOCKS_PER_GROUP(sb));
4641 goto failed_mount;
4642 }
bd81d8ee 4643 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 4644 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4645 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
9e463084
TT		 4646 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4647 le32_to_cpu(es->s_inodes_count)) {
4648 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4649 le32_to_cpu(es->s_inodes_count),
4650 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4651 ret = -EINVAL;
4652 goto failed_mount;
4653 }
617ba13b
MC		 4654 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4655 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 4656 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 4657 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 4658 ext4_msg(sb, KERN_WARNING,
4659 "first meta block group too large: %u "
4660 "(group descriptor block count %u)",
4661 le32_to_cpu(es->s_first_meta_bg), db_count);
4662 goto failed_mount;
4663 }
4664 }
1d0c3924
TT		 4665 rcu_assign_pointer(sbi->s_group_desc,
4666 kvmalloc_array(db_count,
4667 sizeof(struct buffer_head *),
4668 GFP_KERNEL));
ac27a0ec 4669 if (sbi->s_group_desc == NULL) {
b31e1552 4670 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4671 ret = -ENOMEM;
ac27a0ec
DK		 4672 goto failed_mount;
4673 }
4674
705895b6 4675 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4676
85c8f176
AP		 4677 /* Pre-read the descriptors into the buffer cache */
4678 for (i = 0; i < db_count; i++) {
4679 block = descriptor_loc(sb, logical_sb_block, i);
5df1d412 4680 ext4_sb_breadahead_unmovable(sb, block);
85c8f176
AP		 4681 }
4682
ac27a0ec 4683 for (i = 0; i < db_count; i++) {
1d0c3924
TT		 4684 struct buffer_head *bh;
4685
70bbb3e0 4686 block = descriptor_loc(sb, logical_sb_block, i);
8394a6ab 4687 bh = ext4_sb_bread_unmovable(sb, block);
4688 if (IS_ERR(bh)) {
b31e1552
ES		 4689 ext4_msg(sb, KERN_ERR,
4690 "can't read group descriptor %d", i);
ac27a0ec 4691 db_count = i;
8394a6ab 4692 ret = PTR_ERR(bh);
ac27a0ec
DK		 4693 goto failed_mount2;
4694 }
1d0c3924
TT		 4695 rcu_read_lock();
4696 rcu_dereference(sbi->s_group_desc)[i] = bh;
4697 rcu_read_unlock();
ac27a0ec 4698 }
44de022c 4699 sbi->s_gdb_count = db_count;
829fa70d 4700 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4701 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4702 ret = -EFSCORRUPTED;
f9ae9cf5 4703 goto failed_mount2;
ac27a0ec 4704 }
772cb7c8 4705
235699a8 4706 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
c92dc856
JK		 4707 spin_lock_init(&sbi->s_error_lock);
4708 INIT_WORK(&sbi->s_error_work, flush_stashed_error_work);
04496411 4709
a75ae78f 4710 /* Register extent status tree shrinker */
eb68d0e2 4711 if (ext4_es_register_shrinker(sbi))
ce7e010a 4712 goto failed_mount3;
ce7e010a 4713
c9de560d 4714 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4715 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4716
f9ae9cf5
TT		 4717 /*
4718 * set up enough so that it can read an inode
4719 */
f6e63f90 4720 sb->s_op = &ext4_sops;
617ba13b
MC		 4721 sb->s_export_op = &ext4_export_ops;
4722 sb->s_xattr = ext4_xattr_handlers;
643fa961 4723#ifdef CONFIG_FS_ENCRYPTION
a7550b30 4724 sb->s_cop = &ext4_cryptops;
ffcc4182 4725#endif
c93d8f88
EB		 4726#ifdef CONFIG_FS_VERITY
4727 sb->s_vop = &ext4_verityops;
4728#endif
ac27a0ec 4729#ifdef CONFIG_QUOTA
617ba13b 4730 sb->dq_op = &ext4_quota_operations;
e2b911c5 4731 if (ext4_has_feature_quota(sb))
1fa5efe3 4732 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4733 else
4734 sb->s_qcop = &ext4_qctl_operations;
689c958c 4735 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4736#endif
85787090 4737 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4738
ac27a0ec 4739 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4740 mutex_init(&sbi->s_orphan_lock);
ac27a0ec 4741
aa75f4d3
HS		 4742 /* Initialize fast commit stuff */
4743 atomic_set(&sbi->s_fc_subtid, 0);
4744 atomic_set(&sbi->s_fc_ineligible_updates, 0);
4745 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
4746 INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
4747 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
4748 INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
4749 sbi->s_fc_bytes = 0;
9b5f6c9b
HS		 4750 ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
4751 ext4_clear_mount_flag(sb, EXT4_MF_FC_COMMITTING);
aa75f4d3
HS		 4752 spin_lock_init(&sbi->s_fc_lock);
4753 memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
8016e29f
HS		 4754 sbi->s_fc_replay_state.fc_regions = NULL;
4755 sbi->s_fc_replay_state.fc_regions_size = 0;
4756 sbi->s_fc_replay_state.fc_regions_used = 0;
4757 sbi->s_fc_replay_state.fc_regions_valid = 0;
4758 sbi->s_fc_replay_state.fc_modified_inodes = NULL;
4759 sbi->s_fc_replay_state.fc_modified_inodes_size = 0;
4760 sbi->s_fc_replay_state.fc_modified_inodes_used = 0;
aa75f4d3 4761
ac27a0ec
DK		 4762 sb->s_root = NULL;
4763
4764 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4765 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4766
bc98a42c 4767 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4768 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4769 goto failed_mount3a;
c5e06d10 4770
ac27a0ec
DK		 4771 /*
4772 * The first inode we look at is the journal inode. Don't try
4773 * root first: it may be modified in the journal!
4774 */
e2b911c5 4775 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4776 err = ext4_load_journal(sb, es, journal_devnum);
4777 if (err)
50460fe8 4778 goto failed_mount3a;
bc98a42c 4779 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4780 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4781 ext4_msg(sb, KERN_ERR, "required journal recovery "
4782 "suppressed and not mounted read-only");
744692dc 4783 goto failed_mount_wq;
ac27a0ec 4784 } else {
1e381f60
DM		 4785 /* Nojournal mode, all journal mount options are illegal */
4786 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4787 ext4_msg(sb, KERN_ERR, "can't mount with "
4788 "journal_checksum, fs mounted w/o journal");
4789 goto failed_mount_wq;
4790 }
4791 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4792 ext4_msg(sb, KERN_ERR, "can't mount with "
4793 "journal_async_commit, fs mounted w/o journal");
4794 goto failed_mount_wq;
4795 }
4796 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4797 ext4_msg(sb, KERN_ERR, "can't mount with "
4798 "commit=%lu, fs mounted w/o journal",
4799 sbi->s_commit_interval / HZ);
4800 goto failed_mount_wq;
4801 }
4802 if (EXT4_MOUNT_DATA_FLAGS &
4803 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4804 ext4_msg(sb, KERN_ERR, "can't mount with "
4805 "data=, fs mounted w/o journal");
4806 goto failed_mount_wq;
4807 }
50b29d8f 4808 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
1e381f60 4809 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4810 clear_opt(sb, DATA_FLAGS);
995a3ed6 4811 clear_opt2(sb, JOURNAL_FAST_COMMIT);
0390131b
FM		 4812 sbi->s_journal = NULL;
4813 needs_recovery = 0;
4814 goto no_journal;
ac27a0ec
DK		 4815 }
4816
e2b911c5 4817 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4818 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4819 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4820 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4821 goto failed_mount_wq;
eb40a09c
JS		 4822 }
4823
25ed6e8a
DW		 4824 if (!set_journal_csum_feature_set(sb)) {
4825 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4826 "feature set");
4827 goto failed_mount_wq;
d4da6c9c 4828 }
818d276c 4829
a1e5e465
HS		 4830 if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
4831 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4832 JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {
4833 ext4_msg(sb, KERN_ERR,
4834 "Failed to set fast commit journal feature");
4835 goto failed_mount_wq;
4836 }
4837
ac27a0ec
DK		 4838 /* We have now updated the journal if required, so we can
4839 * validate the data journaling mode. */
4840 switch (test_opt(sb, DATA_FLAGS)) {
4841 case 0:
4842 /* No mode set, assume a default based on the journal
63f57933
AM		 4843 * capabilities: ORDERED_DATA if the journal can
4844 * cope, else JOURNAL_DATA
4845 */
dab291af 4846 if (jbd2_journal_check_available_features
27f394a7 4847 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
fd8c37ec 4848 set_opt(sb, ORDERED_DATA);
27f394a7
TN		 4849 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4850 } else {
fd8c37ec 4851 set_opt(sb, JOURNAL_DATA);
27f394a7
TN		 4852 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4853 }
ac27a0ec
DK		 4854 break;
4855
617ba13b
MC		 4856 case EXT4_MOUNT_ORDERED_DATA:
4857 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4858 if (!jbd2_journal_check_available_features
4859 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4860 ext4_msg(sb, KERN_ERR, "Journal does not support "
4861 "requested data journaling mode");
744692dc 4862 goto failed_mount_wq;
ac27a0ec 4863 }
5a150bde 4864 break;
ac27a0ec
DK		 4865 default:
4866 break;
4867 }
ab04df78
JK		 4868
4869 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4870 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4871 ext4_msg(sb, KERN_ERR, "can't mount with "
4872 "journal_async_commit in data=ordered mode");
4873 goto failed_mount_wq;
4874 }
4875
b3881f74 4876 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4877
18aadd47 4878 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
342af94e 4879 sbi->s_journal->j_submit_inode_data_buffers =
afb585a9 4880 ext4_journal_submit_inode_data_buffers;
342af94e 4881 sbi->s_journal->j_finish_inode_data_buffers =
afb585a9 4882 ext4_journal_finish_inode_data_buffers;
18aadd47 4883
ce7e010a 4884no_journal:
cdb7ee4c
TE		 4885 if (!test_opt(sb, NO_MBCACHE)) {
4886 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4887 if (!sbi->s_ea_block_cache) {
dec214d0 4888 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4889 "Failed to create ea_block_cache");
dec214d0
TE		 4890 goto failed_mount_wq;
4891 }
cdb7ee4c
TE		 4892
4893 if (ext4_has_feature_ea_inode(sb)) {
4894 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4895 if (!sbi->s_ea_inode_cache) {
4896 ext4_msg(sb, KERN_ERR,
4897 "Failed to create ea_inode_cache");
4898 goto failed_mount_wq;
4899 }
4900 }
9c191f70
M		 4901 }
4902
c93d8f88
EB		 4903 if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4904 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4905 goto failed_mount_wq;
4906 }
4907
bc98a42c 4908 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4909 !ext4_has_feature_encrypt(sb)) {
4910 ext4_set_feature_encrypt(sb);
4392fbc4 4911 ext4_commit_super(sb);
6ddb2447
TT		 4912 }
4913
952fc18e
TT		 4914 /*
4915 * Get the # of file system overhead blocks from the
4916 * superblock if present.
4917 */
4918 if (es->s_overhead_clusters)
4919 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4920 else {
07aa2ea1
LC		 4921 err = ext4_calculate_overhead(sb);
4922 if (err)
952fc18e
TT		 4923 goto failed_mount_wq;
4924 }
4925
fd89d5f2
TH		 4926 /*
4927 * The maximum number of concurrent works can be high and
4928 * concurrency isn't really necessary. Limit it to 1.
4929 */
2e8fa54e
JK		 4930 EXT4_SB(sb)->rsv_conversion_wq =
4931 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4932 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4933 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4934 ret = -ENOMEM;
2e8fa54e
JK		 4935 goto failed_mount4;
4936 }
4937
ac27a0ec 4938 /*
dab291af 4939 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4940 * so we can safely mount the rest of the filesystem now.
4941 */
4942
8a363970 4943 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 4944 if (IS_ERR(root)) {
b31e1552 4945 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4946 ret = PTR_ERR(root);
32a9bb57 4947 root = NULL;
ac27a0ec
DK		 4948 goto failed_mount4;
4949 }
4950 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4951 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4952 iput(root);
ac27a0ec
DK		 4953 goto failed_mount4;
4954 }
b886ee3e 4955
48fde701 4956 sb->s_root = d_make_root(root);
1d1fe1ee 4957 if (!sb->s_root) {
b31e1552 4958 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4959 ret = -ENOMEM;
4960 goto failed_mount4;
4961 }
ac27a0ec 4962
c89128a0
JK		 4963 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4964 if (ret == -EROFS) {
1751e8a6 4965 sb->s_flags |= SB_RDONLY;
c89128a0
JK		 4966 ret = 0;
4967 } else if (ret)
4968 goto failed_mount4a;
ef7f3835 4969
b5799018 4970 ext4_set_resv_clusters(sb);
27dd4385 4971
0f5bde1d
JK		 4972 if (test_opt(sb, BLOCK_VALIDITY)) {
4973 err = ext4_setup_system_zone(sb);
4974 if (err) {
4975 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4976 "zone (%d)", err);
4977 goto failed_mount4a;
4978 }
f9ae9cf5 4979 }
8016e29f 4980 ext4_fc_replay_cleanup(sb);
f9ae9cf5
TT		 4981
4982 ext4_ext_init(sb);
4983 err = ext4_mb_init(sb);
4984 if (err) {
4985 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4986 err);
dcf2d804 4987 goto failed_mount5;
c2774d84
AK		 4988 }
4989
d5e03cbb
TT		 4990 block = ext4_count_free_clusters(sb);
4991 ext4_free_blocks_count_set(sbi->s_es,
4992 EXT4_C2B(sbi, block));
908c7f19
TH		 4993 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4994 GFP_KERNEL);
d5e03cbb
TT		 4995 if (!err) {
4996 unsigned long freei = ext4_count_free_inodes(sb);
4997 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4998 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4999 GFP_KERNEL);
d5e03cbb
TT		 5000 }
5001 if (!err)
5002 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 5003 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 5004 if (!err)
908c7f19
TH		 5005 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
5006 GFP_KERNEL);
c8585c6f 5007 if (!err)
bbd55937 5008 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
c8585c6f 5009
d5e03cbb
TT		 5010 if (err) {
5011 ext4_msg(sb, KERN_ERR, "insufficient memory");
5012 goto failed_mount6;
5013 }
5014
e2b911c5 5015 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 5016 if (!ext4_fill_flex_info(sb)) {
5017 ext4_msg(sb, KERN_ERR,
5018 "unable to initialize "
5019 "flex_bg meta info!");
5020 goto failed_mount6;
5021 }
5022
bfff6873
LC		 5023 err = ext4_register_li_request(sb, first_not_zeroed);
5024 if (err)
dcf2d804 5025 goto failed_mount6;
bfff6873 5026
b5799018 5027 err = ext4_register_sysfs(sb);
dcf2d804
TM		 5028 if (err)
5029 goto failed_mount7;
3197ebdb 5030
9b2ff357
JK		 5031#ifdef CONFIG_QUOTA
5032 /* Enable quota usage during mount. */
bc98a42c 5033 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 5034 err = ext4_enable_quotas(sb);
5035 if (err)
5036 goto failed_mount8;
5037 }
5038#endif /* CONFIG_QUOTA */
5039
bc71726c 5040 /*
5041 * Save the original bdev mapping's wb_err value which could be
5042 * used to detect the metadata async write error.
5043 */
5044 spin_lock_init(&sbi->s_bdev_wb_lock);
9704a322
ZX		 5045 errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
5046 &sbi->s_bdev_wb_err);
bc71726c 5047 sb->s_bdev->bd_super = sb;
617ba13b
MC		 5048 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
5049 ext4_orphan_cleanup(sb, es);
5050 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 5051 if (needs_recovery) {
b31e1552 5052 ext4_msg(sb, KERN_INFO, "recovery complete");
11215630
JK		 5053 err = ext4_mark_recovery_complete(sb, es);
5054 if (err)
5055 goto failed_mount8;
0390131b
FM		 5056 }
5057 if (EXT4_SB(sb)->s_journal) {
5058 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
5059 descr = " journalled data mode";
5060 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
5061 descr = " ordered data mode";
5062 else
5063 descr = " writeback data mode";
5064 } else
5065 descr = "out journal";
5066
79add3a3
LC		 5067 if (test_opt(sb, DISCARD)) {
5068 struct request_queue *q = bdev_get_queue(sb->s_bdev);
5069 if (!blk_queue_discard(q))
5070 ext4_msg(sb, KERN_WARNING,
5071 "mounting with \"discard\" option, but "
5072 "the device does not support discard");
5073 }
5074
e294a537
TT		 5075 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
5076 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
ca9b404f 5077 "Opts: %.*s%s%s. Quota mode: %s.", descr,
5aee0f8a
TT		 5078 (int) sizeof(sbi->s_es->s_mount_opts),
5079 sbi->s_es->s_mount_opts,
ca9b404f
RA		 5080 *sbi->s_es->s_mount_opts ? "; " : "", orig_data,
5081 ext4_quota_mode(sb));
ac27a0ec 5082
66e61a9e
TT		 5083 if (es->s_error_count)
5084 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 5085
efbed4dc
TT		 5086 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
5087 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
5088 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
5089 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
1cf006ed
DM		 5090 atomic_set(&sbi->s_warning_count, 0);
5091 atomic_set(&sbi->s_msg_count, 0);
efbed4dc 5092
d4c402d9 5093 kfree(orig_data);
ac27a0ec
DK		 5094 return 0;
5095
617ba13b 5096cantfind_ext4:
ac27a0ec 5097 if (!silent)
b31e1552 5098 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 5099 goto failed_mount;
5100
72ba7450 5101failed_mount8:
ebd173be 5102 ext4_unregister_sysfs(sb);
cb8d53d2 5103 kobject_put(&sbi->s_kobj);
dcf2d804
TM		 5104failed_mount7:
5105 ext4_unregister_li_request(sb);
5106failed_mount6:
f9ae9cf5 5107 ext4_mb_release(sb);
7c990728
SJS		 5108 rcu_read_lock();
5109 flex_groups = rcu_dereference(sbi->s_flex_groups);
5110 if (flex_groups) {
5111 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
5112 kvfree(flex_groups[i]);
5113 kvfree(flex_groups);
5114 }
5115 rcu_read_unlock();
d5e03cbb
TT		 5116 percpu_counter_destroy(&sbi->s_freeclusters_counter);
5117 percpu_counter_destroy(&sbi->s_freeinodes_counter);
5118 percpu_counter_destroy(&sbi->s_dirs_counter);
5119 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
bbd55937 5120 percpu_free_rwsem(&sbi->s_writepages_rwsem);
00764937 5121failed_mount5:
f9ae9cf5
TT		 5122 ext4_ext_release(sb);
5123 ext4_release_system_zone(sb);
5124failed_mount4a:
94bf608a 5125 dput(sb->s_root);
32a9bb57 5126 sb->s_root = NULL;
94bf608a 5127failed_mount4:
b31e1552 5128 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 5129 if (EXT4_SB(sb)->rsv_conversion_wq)
5130 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 5131failed_mount_wq:
50c15df6
CX		 5132 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
5133 sbi->s_ea_inode_cache = NULL;
5134
5135 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
5136 sbi->s_ea_block_cache = NULL;
5137
0390131b
FM		 5138 if (sbi->s_journal) {
5139 jbd2_journal_destroy(sbi->s_journal);
5140 sbi->s_journal = NULL;
5141 }
50460fe8 5142failed_mount3a:
d3922a77 5143 ext4_es_unregister_shrinker(sbi);
eb68d0e2 5144failed_mount3:
9105bb14 5145 del_timer_sync(&sbi->s_err_report);
c92dc856 5146 flush_work(&sbi->s_error_work);
c5e06d10
JL		 5147 if (sbi->s_mmp_tsk)
5148 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5149failed_mount2:
1d0c3924
TT		 5150 rcu_read_lock();
5151 group_desc = rcu_dereference(sbi->s_group_desc);
ac27a0ec 5152 for (i = 0; i < db_count; i++)
1d0c3924
TT		 5153 brelse(group_desc[i]);
5154 kvfree(group_desc);
5155 rcu_read_unlock();
ac27a0ec 5156failed_mount:
0441984a
DW		 5157 if (sbi->s_chksum_driver)
5158 crypto_free_shash(sbi->s_chksum_driver);
c83ad55e
GKB		 5159
5160#ifdef CONFIG_UNICODE
f8f4acb6 5161 utf8_unload(sb->s_encoding);
c83ad55e
GKB		 5162#endif
5163
ac27a0ec 5164#ifdef CONFIG_QUOTA
a2d4a646 5165 for (i = 0; i < EXT4_MAXQUOTAS; i++)
0ba33fac 5166 kfree(get_qf_name(sb, sbi, i));
ac27a0ec 5167#endif
ac4acb1f 5168 fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
617ba13b 5169 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 5170 brelse(bh);
5171out_fail:
5172 sb->s_fs_info = NULL;
f6830165 5173 kfree(sbi->s_blockgroup_lock);
5aee0f8a 5174out_free_base:
ac27a0ec 5175 kfree(sbi);
d4c402d9 5176 kfree(orig_data);
5e405595 5177 fs_put_dax(dax_dev);
07aa2ea1 5178 return err ? err : ret;
ac27a0ec
DK		 5179}
5180
5181/*
5182 * Setup any per-fs journal parameters now. We'll do this both on
5183 * initial mount, once the journal has been initialised but before we've
5184 * done any recovery; and again on any subsequent remount.
5185 */
617ba13b 5186static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 5187{
617ba13b 5188 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5189
30773840
TT		 5190 journal->j_commit_interval = sbi->s_commit_interval;
5191 journal->j_min_batch_time = sbi->s_min_batch_time;
5192 journal->j_max_batch_time = sbi->s_max_batch_time;
6866d7b3 5193 ext4_fc_init(sb, journal);
ac27a0ec 5194
a931da6a 5195 write_lock(&journal->j_state_lock);
ac27a0ec 5196 if (test_opt(sb, BARRIER))
dab291af 5197 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 5198 else
dab291af 5199 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 5200 if (test_opt(sb, DATA_ERR_ABORT))
5201 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
5202 else
5203 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 5204 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 5205}
5206
c6cb7e77
EW		 5207static struct inode *ext4_get_journal_inode(struct super_block *sb,
5208 unsigned int journal_inum)
ac27a0ec
DK		 5209{
5210 struct inode *journal_inode;
ac27a0ec 5211
c6cb7e77
EW		 5212 /*
5213 * Test for the existence of a valid inode on disk. Bad things
5214 * happen if we iget() an unused inode, as the subsequent iput()
5215 * will try to delete it.
5216 */
8a363970 5217 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 5218 if (IS_ERR(journal_inode)) {
b31e1552 5219 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 5220 return NULL;
5221 }
5222 if (!journal_inode->i_nlink) {
5223 make_bad_inode(journal_inode);
5224 iput(journal_inode);
b31e1552 5225 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 5226 return NULL;
5227 }
5228
e5f8eab8 5229 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 5230 journal_inode, journal_inode->i_size);
1d1fe1ee 5231 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 5232 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 5233 iput(journal_inode);
5234 return NULL;
5235 }
c6cb7e77
EW		 5236 return journal_inode;
5237}
5238
5239static journal_t *ext4_get_journal(struct super_block *sb,
5240 unsigned int journal_inum)
5241{
5242 struct inode *journal_inode;
5243 journal_t *journal;
5244
11215630
JK		 5245 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5246 return NULL;
c6cb7e77
EW		 5247
5248 journal_inode = ext4_get_journal_inode(sb, journal_inum);
5249 if (!journal_inode)
5250 return NULL;
ac27a0ec 5251
dab291af 5252 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 5253 if (!journal) {
b31e1552 5254 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 5255 iput(journal_inode);
5256 return NULL;
5257 }
5258 journal->j_private = sb;
617ba13b 5259 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 5260 return journal;
5261}
5262
617ba13b 5263static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 5264 dev_t j_dev)
5265{
2b2d6d01 5266 struct buffer_head *bh;
ac27a0ec 5267 journal_t *journal;
617ba13b
MC		 5268 ext4_fsblk_t start;
5269 ext4_fsblk_t len;
ac27a0ec 5270 int hblock, blocksize;
617ba13b 5271 ext4_fsblk_t sb_block;
ac27a0ec 5272 unsigned long offset;
2b2d6d01 5273 struct ext4_super_block *es;
ac27a0ec
DK		 5274 struct block_device *bdev;
5275
11215630
JK		 5276 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5277 return NULL;
0390131b 5278
b31e1552 5279 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 5280 if (bdev == NULL)
5281 return NULL;
5282
ac27a0ec 5283 blocksize = sb->s_blocksize;
e1defc4f 5284 hblock = bdev_logical_block_size(bdev);
ac27a0ec 5285 if (blocksize < hblock) {
b31e1552
ES		 5286 ext4_msg(sb, KERN_ERR,
5287 "blocksize too small for journal device");
ac27a0ec
DK		 5288 goto out_bdev;
5289 }
5290
617ba13b
MC		 5291 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5292 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 5293 set_blocksize(bdev, blocksize);
5294 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 5295 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5296 "external journal");
ac27a0ec
DK		 5297 goto out_bdev;
5298 }
5299
2716b802 5300 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 5301 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 5302 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 5303 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 5304 ext4_msg(sb, KERN_ERR, "external journal has "
5305 "bad superblock");
ac27a0ec
DK		 5306 brelse(bh);
5307 goto out_bdev;
5308 }
5309
df4763be
DW		 5310 if ((le32_to_cpu(es->s_feature_ro_compat) &
5311 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5312 es->s_checksum != ext4_superblock_csum(sb, es)) {
5313 ext4_msg(sb, KERN_ERR, "external journal has "
5314 "corrupt superblock");
5315 brelse(bh);
5316 goto out_bdev;
5317 }
5318
617ba13b 5319 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 5320 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 5321 brelse(bh);
5322 goto out_bdev;
5323 }
5324
bd81d8ee 5325 len = ext4_blocks_count(es);
ac27a0ec
DK		 5326 start = sb_block + 1;
5327 brelse(bh); /* we're done with the superblock */
5328
dab291af 5329 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 5330 start, len, blocksize);
5331 if (!journal) {
b31e1552 5332 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 5333 goto out_bdev;
5334 }
5335 journal->j_private = sb;
2d069c08 5336 if (ext4_read_bh_lock(journal->j_sb_buffer, REQ_META | REQ_PRIO, true)) {
b31e1552 5337 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 5338 goto out_journal;
5339 }
5340 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 5341 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5342 "user (unsupported) - %d",
ac27a0ec
DK		 5343 be32_to_cpu(journal->j_superblock->s_nr_users));
5344 goto out_journal;
5345 }
ee7ed3aa 5346 EXT4_SB(sb)->s_journal_bdev = bdev;
617ba13b 5347 ext4_init_journal_params(sb, journal);
ac27a0ec 5348 return journal;
0b8e58a1 5349
ac27a0ec 5350out_journal:
dab291af 5351 jbd2_journal_destroy(journal);
ac27a0ec 5352out_bdev:
617ba13b 5353 ext4_blkdev_put(bdev);
ac27a0ec
DK		 5354 return NULL;
5355}
5356
617ba13b
MC		 5357static int ext4_load_journal(struct super_block *sb,
5358 struct ext4_super_block *es,
ac27a0ec
DK		 5359 unsigned long journal_devnum)
5360{
5361 journal_t *journal;
5362 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5363 dev_t journal_dev;
5364 int err = 0;
5365 int really_read_only;
273108fa 5366 int journal_dev_ro;
ac27a0ec 5367
11215630
JK		 5368 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5369 return -EFSCORRUPTED;
0390131b 5370
ac27a0ec
DK		 5371 if (journal_devnum &&
5372 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 5373 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5374 "numbers have changed");
ac27a0ec
DK		 5375 journal_dev = new_decode_dev(journal_devnum);
5376 } else
5377 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5378
273108fa
LC		 5379 if (journal_inum && journal_dev) {
5380 ext4_msg(sb, KERN_ERR,
5381 "filesystem has both journal inode and journal device!");
5382 return -EINVAL;
5383 }
5384
5385 if (journal_inum) {
5386 journal = ext4_get_journal(sb, journal_inum);
5387 if (!journal)
5388 return -EINVAL;
5389 } else {
5390 journal = ext4_get_dev_journal(sb, journal_dev);
5391 if (!journal)
5392 return -EINVAL;
5393 }
5394
5395 journal_dev_ro = bdev_read_only(journal->j_dev);
5396 really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5397
5398 if (journal_dev_ro && !sb_rdonly(sb)) {
5399 ext4_msg(sb, KERN_ERR,
5400 "journal device read-only, try mounting with '-o ro'");
5401 err = -EROFS;
5402 goto err_out;
5403 }
ac27a0ec
DK		 5404
5405 /*
5406 * Are we loading a blank journal or performing recovery after a
5407 * crash? For recovery, we need to check in advance whether we
5408 * can get read-write access to the device.
5409 */
e2b911c5 5410 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 5411 if (sb_rdonly(sb)) {
b31e1552
ES		 5412 ext4_msg(sb, KERN_INFO, "INFO: recovery "
5413 "required on readonly filesystem");
ac27a0ec 5414 if (really_read_only) {
b31e1552 5415 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 5416 "unavailable, cannot proceed "
5417 "(try mounting with noload)");
273108fa
LC		 5418 err = -EROFS;
5419 goto err_out;
ac27a0ec 5420 }
b31e1552
ES		 5421 ext4_msg(sb, KERN_INFO, "write access will "
5422 "be enabled during recovery");
ac27a0ec
DK		 5423 }
5424 }
5425
90576c0b 5426 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 5427 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 5428
e2b911c5 5429 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 5430 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 5431 if (!err) {
5432 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
5433 if (save)
5434 memcpy(save, ((char *) es) +
5435 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 5436 err = jbd2_journal_load(journal);
1c13d5c0
TT		 5437 if (save)
5438 memcpy(((char *) es) + EXT4_S_ERR_START,
5439 save, EXT4_S_ERR_LEN);
5440 kfree(save);
5441 }
ac27a0ec
DK		 5442
5443 if (err) {
b31e1552 5444 ext4_msg(sb, KERN_ERR, "error loading journal");
273108fa 5445 goto err_out;
ac27a0ec
DK		 5446 }
5447
617ba13b 5448 EXT4_SB(sb)->s_journal = journal;
11215630
JK		 5449 err = ext4_clear_journal_err(sb, es);
5450 if (err) {
5451 EXT4_SB(sb)->s_journal = NULL;
5452 jbd2_journal_destroy(journal);
5453 return err;
5454 }
ac27a0ec 5455
c41303ce 5456 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 5457 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5458 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 5459
5460 /* Make sure we flush the recovery flag to disk. */
4392fbc4 5461 ext4_commit_super(sb);
ac27a0ec
DK		 5462 }
5463
5464 return 0;
273108fa
LC		 5465
5466err_out:
5467 jbd2_journal_destroy(journal);
5468 return err;
ac27a0ec
DK		 5469}
5470
2d01ddc8
JK		 5471/* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
5472static void ext4_update_super(struct super_block *sb)
ac27a0ec 5473{
c92dc856 5474 struct ext4_sb_info *sbi = EXT4_SB(sb);
e92ad03f
JK		 5475 struct ext4_super_block *es = sbi->s_es;
5476 struct buffer_head *sbh = sbi->s_sbh;
a17712c8 5477
05c2c00f 5478 lock_buffer(sbh);
71290b36
TT		 5479 /*
5480 * If the file system is mounted read-only, don't update the
5481 * superblock write time. This avoids updating the superblock
5482 * write time when we are mounting the root file system
5483 * read/only but we need to replay the journal; at that point,
5484 * for people who are east of GMT and who make their clock
5485 * tick in localtime for Windows bug-for-bug compatibility,
5486 * the clock is set in the future, and this will cause e2fsck
5487 * to complain and force a full file system check.
5488 */
1751e8a6 5489 if (!(sb->s_flags & SB_RDONLY))
6a0678a7 5490 ext4_update_tstamp(es, s_wtime);
8446fe92 5491 es->s_kbytes_written =
0bc9bc1d 5492 cpu_to_le64(sbi->s_kbytes_written +
8446fe92 5493 ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
0bc9bc1d 5494 sbi->s_sectors_written_start) >> 1));
e92ad03f 5495 if (percpu_counter_initialized(&sbi->s_freeclusters_counter))
d5e03cbb 5496 ext4_free_blocks_count_set(es,
e92ad03f
JK		 5497 EXT4_C2B(sbi, percpu_counter_sum_positive(
5498 &sbi->s_freeclusters_counter)));
5499 if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
d5e03cbb
TT		 5500 es->s_free_inodes_count =
5501 cpu_to_le32(percpu_counter_sum_positive(
e92ad03f 5502 &sbi->s_freeinodes_counter));
c92dc856
JK		 5503 /* Copy error information to the on-disk superblock */
5504 spin_lock(&sbi->s_error_lock);
5505 if (sbi->s_add_error_count > 0) {
5506 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5507 if (!es->s_first_error_time && !es->s_first_error_time_hi) {
5508 __ext4_update_tstamp(&es->s_first_error_time,
5509 &es->s_first_error_time_hi,
5510 sbi->s_first_error_time);
5511 strncpy(es->s_first_error_func, sbi->s_first_error_func,
5512 sizeof(es->s_first_error_func));
5513 es->s_first_error_line =
5514 cpu_to_le32(sbi->s_first_error_line);
5515 es->s_first_error_ino =
5516 cpu_to_le32(sbi->s_first_error_ino);
5517 es->s_first_error_block =
5518 cpu_to_le64(sbi->s_first_error_block);
5519 es->s_first_error_errcode =
5520 ext4_errno_to_code(sbi->s_first_error_code);
5521 }
5522 __ext4_update_tstamp(&es->s_last_error_time,
5523 &es->s_last_error_time_hi,
5524 sbi->s_last_error_time);
5525 strncpy(es->s_last_error_func, sbi->s_last_error_func,
5526 sizeof(es->s_last_error_func));
5527 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);
5528 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);
5529 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);
5530 es->s_last_error_errcode =
5531 ext4_errno_to_code(sbi->s_last_error_code);
5532 /*
5533 * Start the daily error reporting function if it hasn't been
5534 * started already
5535 */
5536 if (!es->s_error_count)
5537 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
5538 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);
5539 sbi->s_add_error_count = 0;
5540 }
5541 spin_unlock(&sbi->s_error_lock);
5542
06db49e6 5543 ext4_superblock_csum_set(sb);
2d01ddc8
JK		 5544 unlock_buffer(sbh);
5545}
5546
5547static int ext4_commit_super(struct super_block *sb)
5548{
5549 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
5550 int error = 0;
5551
5552 if (!sbh || block_device_ejected(sb))
5553 return error;
5554
5555 ext4_update_super(sb);
5556
e8680786 5557 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 5558 /*
5559 * Oh, dear. A previous attempt to write the
5560 * superblock failed. This could happen because the
5561 * USB device was yanked out. Or it could happen to
5562 * be a transient write error and maybe the block will
5563 * be remapped. Nothing we can do but to retry the
5564 * write and hope for the best.
5565 */
5566 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5567 "superblock detected");
5568 clear_buffer_write_io_error(sbh);
5569 set_buffer_uptodate(sbh);
5570 }
2d01ddc8 5571 BUFFER_TRACE(sbh, "marking dirty");
ac27a0ec 5572 mark_buffer_dirty(sbh);
4392fbc4
JK		 5573 error = __sync_dirty_buffer(sbh,
5574 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
5575 if (buffer_write_io_error(sbh)) {
5576 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5577 "superblock");
5578 clear_buffer_write_io_error(sbh);
5579 set_buffer_uptodate(sbh);
914258bf 5580 }
c4be0c1d 5581 return error;
ac27a0ec
DK		 5582}
5583
ac27a0ec
DK		 5584/*
5585 * Have we just finished recovery? If so, and if we are mounting (or
5586 * remounting) the filesystem readonly, then we will end up with a
5587 * consistent fs on disk. Record that fact.
5588 */
11215630
JK		 5589static int ext4_mark_recovery_complete(struct super_block *sb,
5590 struct ext4_super_block *es)
ac27a0ec 5591{
11215630 5592 int err;
617ba13b 5593 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 5594
e2b911c5 5595 if (!ext4_has_feature_journal(sb)) {
11215630
JK		 5596 if (journal != NULL) {
5597 ext4_error(sb, "Journal got removed while the fs was "
5598 "mounted!");
5599 return -EFSCORRUPTED;
5600 }
5601 return 0;
0390131b 5602 }
dab291af 5603 jbd2_journal_lock_updates(journal);
11215630
JK		 5604 err = jbd2_journal_flush(journal);
5605 if (err < 0)
7ffe1ea8
HK		 5606 goto out;
5607
bc98a42c 5608 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 5609 ext4_clear_feature_journal_needs_recovery(sb);
4392fbc4 5610 ext4_commit_super(sb);
ac27a0ec 5611 }
7ffe1ea8 5612out:
dab291af 5613 jbd2_journal_unlock_updates(journal);
11215630 5614 return err;
ac27a0ec
DK		 5615}
5616
5617/*
5618 * If we are mounting (or read-write remounting) a filesystem whose journal
5619 * has recorded an error from a previous lifetime, move that error to the
5620 * main filesystem now.
5621 */
11215630 5622static int ext4_clear_journal_err(struct super_block *sb,
2b2d6d01 5623 struct ext4_super_block *es)
ac27a0ec
DK		 5624{
5625 journal_t *journal;
5626 int j_errno;
5627 const char *errstr;
5628
11215630
JK		 5629 if (!ext4_has_feature_journal(sb)) {
5630 ext4_error(sb, "Journal got removed while the fs was mounted!");
5631 return -EFSCORRUPTED;
5632 }
0390131b 5633
617ba13b 5634 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 5635
5636 /*
5637 * Now check for any error status which may have been recorded in the
617ba13b 5638 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 5639 */
5640
dab291af 5641 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 5642 if (j_errno) {
5643 char nbuf[16];
5644
617ba13b 5645 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 5646 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 5647 "from previous mount: %s", errstr);
12062ddd 5648 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 5649
617ba13b
MC		 5650 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5651 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4392fbc4 5652 ext4_commit_super(sb);
ac27a0ec 5653
dab291af 5654 jbd2_journal_clear_err(journal);
d796c52e 5655 jbd2_journal_update_sb_errno(journal);
ac27a0ec 5656 }
11215630 5657 return 0;
ac27a0ec
DK		 5658}
5659
5660/*
5661 * Force the running and committing transactions to commit,
5662 * and wait on the commit.
5663 */
617ba13b 5664int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 5665{
5666 journal_t *journal;
ac27a0ec 5667
bc98a42c 5668 if (sb_rdonly(sb))
ac27a0ec
DK		 5669 return 0;
5670
617ba13b 5671 journal = EXT4_SB(sb)->s_journal;
b1deefc9 5672 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 5673}
5674
617ba13b 5675static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 5676{
14ce0cb4 5677 int ret = 0;
9eddacf9 5678 tid_t target;
06a407f1 5679 bool needs_barrier = false;
8d5d02e6 5680 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5681
49598e04 5682 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 5683 return 0;
5684
9bffad1e 5685 trace_ext4_sync_fs(sb, wait);
2e8fa54e 5686 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 5687 /*
5688 * Writeback quota in non-journalled quota case - journalled quota has
5689 * no dirty dquots
5690 */
5691 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 5692 /*
5693 * Data writeback is possible w/o journal transaction, so barrier must
5694 * being sent at the end of the function. But we can skip it if
5695 * transaction_commit will do it for us.
5696 */
bda32530
TT		 5697 if (sbi->s_journal) {
5698 target = jbd2_get_latest_transaction(sbi->s_journal);
5699 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5700 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5701 needs_barrier = true;
5702
5703 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5704 if (wait)
5705 ret = jbd2_log_wait_commit(sbi->s_journal,
5706 target);
5707 }
5708 } else if (wait && test_opt(sb, BARRIER))
06a407f1 5709 needs_barrier = true;
06a407f1
DM		 5710 if (needs_barrier) {
5711 int err;
9398554f 5712 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL);
06a407f1
DM		 5713 if (!ret)
5714 ret = err;
0390131b 5715 }
06a407f1
DM		 5716
5717 return ret;
5718}
5719
ac27a0ec
DK		 5720/*
5721 * LVM calls this function before a (read-only) snapshot is created. This
5722 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 5723 *
5724 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 5725 * state independently. It relies on upper layer to stop all data & metadata
5726 * modifications.
ac27a0ec 5727 */
c4be0c1d 5728static int ext4_freeze(struct super_block *sb)
ac27a0ec 5729{
c4be0c1d
TS		 5730 int error = 0;
5731 journal_t *journal;
ac27a0ec 5732
bc98a42c 5733 if (sb_rdonly(sb))
9ca92389 5734 return 0;
ac27a0ec 5735
9ca92389 5736 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 5737
bb044576
TT		 5738 if (journal) {
5739 /* Now we set up the journal barrier. */
5740 jbd2_journal_lock_updates(journal);
ac27a0ec 5741
bb044576
TT		 5742 /*
5743 * Don't clear the needs_recovery flag if we failed to
5744 * flush the journal.
5745 */
5746 error = jbd2_journal_flush(journal);
5747 if (error < 0)
5748 goto out;
c642dc9e
ES		 5749
5750 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 5751 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 5752 }
9ca92389 5753
4392fbc4 5754 error = ext4_commit_super(sb);
6b0310fb 5755out:
bb044576
TT		 5756 if (journal)
5757 /* we rely on upper layer to stop further updates */
5758 jbd2_journal_unlock_updates(journal);
6b0310fb 5759 return error;
ac27a0ec
DK		 5760}
5761
5762/*
5763 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5764 * flag here, even though the filesystem is not technically dirty yet.
5765 */
c4be0c1d 5766static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 5767{
bc98a42c 5768 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 5769 return 0;
5770
c642dc9e
ES		 5771 if (EXT4_SB(sb)->s_journal) {
5772 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 5773 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 5774 }
5775
4392fbc4 5776 ext4_commit_super(sb);
c4be0c1d 5777 return 0;
ac27a0ec
DK		 5778}
5779
673c6100
TT		 5780/*
5781 * Structure to save mount options for ext4_remount's benefit
5782 */
5783struct ext4_mount_options {
5784 unsigned long s_mount_opt;
a2595b8a 5785 unsigned long s_mount_opt2;
08cefc7a
EB		 5786 kuid_t s_resuid;
5787 kgid_t s_resgid;
673c6100
TT		 5788 unsigned long s_commit_interval;
5789 u32 s_min_batch_time, s_max_batch_time;
5790#ifdef CONFIG_QUOTA
5791 int s_jquota_fmt;
a2d4a646 5792 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 5793#endif
5794};
5795
2b2d6d01 5796static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5797{
2b2d6d01 5798 struct ext4_super_block *es;
617ba13b 5799 struct ext4_sb_info *sbi = EXT4_SB(sb);
f25391eb 5800 unsigned long old_sb_flags, vfs_flags;
617ba13b 5801 struct ext4_mount_options old_opts;
c79d967d 5802 int enable_quota = 0;
8a266467 5803 ext4_group_t g;
b3881f74 5804 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5805 int err = 0;
ac27a0ec 5806#ifdef CONFIG_QUOTA
03dafb5f 5807 int i, j;
33458eab 5808 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec 5809#endif
d4c402d9 5810 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec 5811
21ac738e
CX		 5812 if (data && !orig_data)
5813 return -ENOMEM;
5814
ac27a0ec
DK		 5815 /* Store the original options */
5816 old_sb_flags = sb->s_flags;
5817 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5818 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5819 old_opts.s_resuid = sbi->s_resuid;
5820 old_opts.s_resgid = sbi->s_resgid;
5821 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5822 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5823 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5824#ifdef CONFIG_QUOTA
5825 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5826 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5827 if (sbi->s_qf_names[i]) {
33458eab
TT		 5828 char *qf_name = get_qf_name(sb, sbi, i);
5829
5830 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 5831 if (!old_opts.s_qf_names[i]) {
5832 for (j = 0; j < i; j++)
5833 kfree(old_opts.s_qf_names[j]);
3e36a163 5834 kfree(orig_data);
03dafb5f
CG		 5835 return -ENOMEM;
5836 }
5837 } else
5838 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5839#endif
b3881f74
TT		 5840 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5841 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5842
f25391eb
LC		 5843 /*
5844 * Some options can be enabled by ext4 and/or by VFS mount flag
5845 * either way we need to make sure it matches in both *flags and
5846 * s_flags. Copy those selected flags from *flags to s_flags
5847 */
5848 vfs_flags = SB_LAZYTIME | SB_I_VERSION;
5849 sb->s_flags = (sb->s_flags & ~vfs_flags) | (*flags & vfs_flags);
5850
661aa520 5851 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5852 err = -EINVAL;
5853 goto restore_opts;
5854 }
5855
6b992ff2 5856 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5857 test_opt(sb, JOURNAL_CHECKSUM)) {
5858 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5859 "during remount not supported; ignoring");
5860 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5861 }
5862
6ae6514b
PS		 5863 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5864 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5865 ext4_msg(sb, KERN_ERR, "can't mount with "
5866 "both data=journal and delalloc");
5867 err = -EINVAL;
5868 goto restore_opts;
5869 }
5870 if (test_opt(sb, DIOREAD_NOLOCK)) {
5871 ext4_msg(sb, KERN_ERR, "can't mount with "
5872 "both data=journal and dioread_nolock");
5873 err = -EINVAL;
5874 goto restore_opts;
5875 }
ab04df78
JK		 5876 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5877 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5878 ext4_msg(sb, KERN_ERR, "can't mount with "
5879 "journal_async_commit in data=ordered mode");
5880 err = -EINVAL;
5881 goto restore_opts;
5882 }
923ae0ff
RZ		 5883 }
5884
cdb7ee4c
TE		 5885 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5886 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5887 err = -EINVAL;
5888 goto restore_opts;
5889 }
5890
9b5f6c9b 5891 if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
54d3adbc 5892 ext4_abort(sb, EXT4_ERR_ESHUTDOWN, "Abort forced by user");
ac27a0ec 5893
1751e8a6
LT		 5894 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5895 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5896
5897 es = sbi->s_es;
5898
b3881f74 5899 if (sbi->s_journal) {
0390131b 5900 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5901 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5902 }
ac27a0ec 5903
c92dc856
JK		 5904 /* Flush outstanding errors before changing fs state */
5905 flush_work(&sbi->s_error_work);
5906
1751e8a6 5907 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
9b5f6c9b 5908 if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED)) {
ac27a0ec
DK		 5909 err = -EROFS;
5910 goto restore_opts;
5911 }
5912
1751e8a6 5913 if (*flags & SB_RDONLY) {
38c03b34
TT		 5914 err = sync_filesystem(sb);
5915 if (err < 0)
5916 goto restore_opts;
0f0dd62f
CH		 5917 err = dquot_suspend(sb, -1);
5918 if (err < 0)
c79d967d 5919 goto restore_opts;
c79d967d 5920
ac27a0ec
DK		 5921 /*
5922 * First of all, the unconditional stuff we have to do
5923 * to disable replay of the journal when we next remount
5924 */
1751e8a6 5925 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5926
5927 /*
5928 * OK, test if we are remounting a valid rw partition
5929 * readonly, and if so set the rdonly flag and then
5930 * mark the partition as valid again.
5931 */
617ba13b
MC		 5932 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5933 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5934 es->s_state = cpu_to_le16(sbi->s_mount_state);
5935
11215630
JK		 5936 if (sbi->s_journal) {
5937 /*
5938 * We let remount-ro finish even if marking fs
5939 * as clean failed...
5940 */
0390131b 5941 ext4_mark_recovery_complete(sb, es);
11215630 5942 }
2dca60d9
TT		 5943 if (sbi->s_mmp_tsk)
5944 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5945 } else {
a13fb1a4 5946 /* Make sure we can mount this feature set readwrite */
e2b911c5 5947 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5948 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5949 err = -EROFS;
5950 goto restore_opts;
5951 }
8a266467
TT		 5952 /*
5953 * Make sure the group descriptor checksums
0b8e58a1 5954 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5955 */
5956 for (g = 0; g < sbi->s_groups_count; g++) {
5957 struct ext4_group_desc *gdp =
5958 ext4_get_group_desc(sb, g, NULL);
5959
feb0ab32 5960 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5961 ext4_msg(sb, KERN_ERR,
5962 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5963 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5964 le16_to_cpu(gdp->bg_checksum));
6a797d27 5965 err = -EFSBADCRC;
8a266467
TT		 5966 goto restore_opts;
5967 }
5968 }
5969
ead6596b
ES		 5970 /*
5971 * If we have an unprocessed orphan list hanging
5972 * around from a previously readonly bdev mount,
5973 * require a full umount/remount for now.
5974 */
5975 if (es->s_last_orphan) {
b31e1552 5976 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5977 "remount RDWR because of unprocessed "
5978 "orphan inode list. Please "
b31e1552 5979 "umount/remount instead");
ead6596b
ES		 5980 err = -EINVAL;
5981 goto restore_opts;
5982 }
5983
ac27a0ec
DK		 5984 /*
5985 * Mounting a RDONLY partition read-write, so reread
5986 * and store the current valid flag. (It may have
5987 * been changed by e2fsck since we originally mounted
5988 * the partition.)
5989 */
11215630
JK		 5990 if (sbi->s_journal) {
5991 err = ext4_clear_journal_err(sb, es);
5992 if (err)
5993 goto restore_opts;
5994 }
ac27a0ec 5995 sbi->s_mount_state = le16_to_cpu(es->s_state);
c89128a0
JK		 5996
5997 err = ext4_setup_super(sb, es, 0);
5998 if (err)
5999 goto restore_opts;
6000
6001 sb->s_flags &= ~SB_RDONLY;
e2b911c5 6002 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 6003 if (ext4_multi_mount_protect(sb,
6004 le64_to_cpu(es->s_mmp_block))) {
6005 err = -EROFS;
6006 goto restore_opts;
6007 }
c79d967d 6008 enable_quota = 1;
ac27a0ec
DK		 6009 }
6010 }
bfff6873
LC		 6011
6012 /*
6013 * Reinitialize lazy itable initialization thread based on
6014 * current settings
6015 */
bc98a42c 6016 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 6017 ext4_unregister_li_request(sb);
6018 else {
6019 ext4_group_t first_not_zeroed;
6020 first_not_zeroed = ext4_has_uninit_itable(sb);
6021 ext4_register_li_request(sb, first_not_zeroed);
6022 }
6023
0f5bde1d
JK		 6024 /*
6025 * Handle creation of system zone data early because it can fail.
6026 * Releasing of existing data is done when we are sure remount will
6027 * succeed.
6028 */
dd0db94f 6029 if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {
0f5bde1d
JK		 6030 err = ext4_setup_system_zone(sb);
6031 if (err)
6032 goto restore_opts;
6033 }
d176b1f6 6034
c89128a0 6035 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
4392fbc4 6036 err = ext4_commit_super(sb);
c89128a0
JK		 6037 if (err)
6038 goto restore_opts;
6039 }
0390131b 6040
ac27a0ec
DK		 6041#ifdef CONFIG_QUOTA
6042 /* Release old quota file names */
a2d4a646 6043 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 6044 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 6045 if (enable_quota) {
6046 if (sb_any_quota_suspended(sb))
6047 dquot_resume(sb, -1);
e2b911c5 6048 else if (ext4_has_feature_quota(sb)) {
7c319d32 6049 err = ext4_enable_quotas(sb);
07724f98 6050 if (err)
7c319d32 6051 goto restore_opts;
7c319d32
AK		 6052 }
6053 }
ac27a0ec 6054#endif
dd0db94f 6055 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
0f5bde1d 6056 ext4_release_system_zone(sb);
d4c402d9 6057
f25391eb
LC		 6058 /*
6059 * Some options can be enabled by ext4 and/or by VFS mount flag
6060 * either way we need to make sure it matches in both *flags and
6061 * s_flags. Copy those selected flags from s_flags to *flags
6062 */
6063 *flags = (*flags & ~vfs_flags) | (sb->s_flags & vfs_flags);
d4c402d9 6064
ca9b404f
RA		 6065 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s. Quota mode: %s.",
6066 orig_data, ext4_quota_mode(sb));
d4c402d9 6067 kfree(orig_data);
ac27a0ec 6068 return 0;
0b8e58a1 6069
ac27a0ec
DK		 6070restore_opts:
6071 sb->s_flags = old_sb_flags;
6072 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 6073 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 6074 sbi->s_resuid = old_opts.s_resuid;
6075 sbi->s_resgid = old_opts.s_resgid;
6076 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 6077 sbi->s_min_batch_time = old_opts.s_min_batch_time;
6078 sbi->s_max_batch_time = old_opts.s_max_batch_time;
dd0db94f 6079 if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
0f5bde1d 6080 ext4_release_system_zone(sb);
ac27a0ec
DK		 6081#ifdef CONFIG_QUOTA
6082 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 6083 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
33458eab
TT		 6084 to_free[i] = get_qf_name(sb, sbi, i);
6085 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 6086 }
33458eab
TT		 6087 synchronize_rcu();
6088 for (i = 0; i < EXT4_MAXQUOTAS; i++)
6089 kfree(to_free[i]);
ac27a0ec 6090#endif
d4c402d9 6091 kfree(orig_data);
ac27a0ec
DK		 6092 return err;
6093}
6094
689c958c
LX		 6095#ifdef CONFIG_QUOTA
6096static int ext4_statfs_project(struct super_block *sb,
6097 kprojid_t projid, struct kstatfs *buf)
6098{
6099 struct kqid qid;
6100 struct dquot *dquot;
6101 u64 limit;
6102 u64 curblock;
6103
6104 qid = make_kqid_projid(projid);
6105 dquot = dqget(sb, qid);
6106 if (IS_ERR(dquot))
6107 return PTR_ERR(dquot);
7b9ca4c6 6108 spin_lock(&dquot->dq_dqb_lock);
689c958c 6109
a08fe66e
CX		 6110 limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
6111 dquot->dq_dqb.dqb_bhardlimit);
57c32ea4
CX		 6112 limit >>= sb->s_blocksize_bits;
6113
689c958c 6114 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 6115 curblock = (dquot->dq_dqb.dqb_curspace +
6116 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 6117 buf->f_blocks = limit;
6118 buf->f_bfree = buf->f_bavail =
6119 (buf->f_blocks > curblock) ?
6120 (buf->f_blocks - curblock) : 0;
6121 }
6122
a08fe66e
CX		 6123 limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
6124 dquot->dq_dqb.dqb_ihardlimit);
689c958c
LX		 6125 if (limit && buf->f_files > limit) {
6126 buf->f_files = limit;
6127 buf->f_ffree =
6128 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
6129 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
6130 }
6131
7b9ca4c6 6132 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 6133 dqput(dquot);
6134 return 0;
6135}
6136#endif
6137
2b2d6d01 6138static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 6139{
6140 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 6141 struct ext4_sb_info *sbi = EXT4_SB(sb);
6142 struct ext4_super_block *es = sbi->s_es;
27dd4385 6143 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 6144 u64 fsid;
d02a9391 6145 s64 bfree;
27dd4385 6146 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 6147
952fc18e
TT		 6148 if (!test_opt(sb, MINIX_DF))
6149 overhead = sbi->s_overhead;
ac27a0ec 6150
617ba13b 6151 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 6152 buf->f_bsize = sb->s_blocksize;
b72f78cb 6153 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 6154 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
6155 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 6156 /* prevent underflow in case that few free space is available */
57042651 6157 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 6158 buf->f_bavail = buf->f_bfree -
6159 (ext4_r_blocks_count(es) + resv_blocks);
6160 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 6161 buf->f_bavail = 0;
6162 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 6163 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 6164 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 6165 fsid = le64_to_cpup((void *)es->s_uuid) ^
6166 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
6d1349c7 6167 buf->f_fsid = u64_to_fsid(fsid);
0b8e58a1 6168
689c958c
LX		 6169#ifdef CONFIG_QUOTA
6170 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
6171 sb_has_quota_limits_enabled(sb, PRJQUOTA))
6172 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
6173#endif
ac27a0ec
DK		 6174 return 0;
6175}
6176
ac27a0ec
DK		 6177
6178#ifdef CONFIG_QUOTA
6179
bc8230ee
JK		 6180/*
6181 * Helper functions so that transaction is started before we acquire dqio_sem
6182 * to keep correct lock ordering of transaction > dqio_sem
6183 */
ac27a0ec
DK		 6184static inline struct inode *dquot_to_inode(struct dquot *dquot)
6185{
4c376dca 6186 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 6187}
6188
617ba13b 6189static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 6190{
6191 int ret, err;
6192 handle_t *handle;
6193 struct inode *inode;
6194
6195 inode = dquot_to_inode(dquot);
9924a92a 6196 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 6197 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 6198 if (IS_ERR(handle))
6199 return PTR_ERR(handle);
6200 ret = dquot_commit(dquot);
617ba13b 6201 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6202 if (!ret)
6203 ret = err;
6204 return ret;
6205}
6206
617ba13b 6207static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 6208{
6209 int ret, err;
6210 handle_t *handle;
6211
9924a92a 6212 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 6213 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 6214 if (IS_ERR(handle))
6215 return PTR_ERR(handle);
6216 ret = dquot_acquire(dquot);
617ba13b 6217 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6218 if (!ret)
6219 ret = err;
6220 return ret;
6221}
6222
617ba13b 6223static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 6224{
6225 int ret, err;
6226 handle_t *handle;
6227
9924a92a 6228 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 6229 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 6230 if (IS_ERR(handle)) {
6231 /* Release dquot anyway to avoid endless cycle in dqput() */
6232 dquot_release(dquot);
ac27a0ec 6233 return PTR_ERR(handle);
9c3013e9 6234 }
ac27a0ec 6235 ret = dquot_release(dquot);
617ba13b 6236 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6237 if (!ret)
6238 ret = err;
6239 return ret;
6240}
6241
617ba13b 6242static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 6243{
262b4662 6244 struct super_block *sb = dquot->dq_sb;
262b4662 6245
f177ee08 6246 if (ext4_is_quota_journalled(sb)) {
ac27a0ec 6247 dquot_mark_dquot_dirty(dquot);
617ba13b 6248 return ext4_write_dquot(dquot);
ac27a0ec
DK		 6249 } else {
6250 return dquot_mark_dquot_dirty(dquot);
6251 }
6252}
6253
617ba13b 6254static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 6255{
6256 int ret, err;
6257 handle_t *handle;
6258
6259 /* Data block + inode block */
2b0143b5 6260 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 6261 if (IS_ERR(handle))
6262 return PTR_ERR(handle);
6263 ret = dquot_commit_info(sb, type);
617ba13b 6264 err = ext4_journal_stop(handle);
ac27a0ec
DK		 6265 if (!ret)
6266 ret = err;
6267 return ret;
6268}
6269
6270/*
6271 * Turn on quotas during mount time - we need to find
6272 * the quota file and such...
6273 */
617ba13b 6274static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 6275{
33458eab 6276 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
287a8095 6277 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 6278}
6279
daf647d2
TT		 6280static void lockdep_set_quota_inode(struct inode *inode, int subclass)
6281{
6282 struct ext4_inode_info *ei = EXT4_I(inode);
6283
6284 /* The first argument of lockdep_set_subclass has to be
6285 * *exactly* the same as the argument to init_rwsem() --- in
6286 * this case, in init_once() --- or lockdep gets unhappy
6287 * because the name of the lock is set using the
6288 * stringification of the argument to init_rwsem().
6289 */
6290 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
6291 lockdep_set_subclass(&ei->i_data_sem, subclass);
6292}
6293
ac27a0ec
DK		 6294/*
6295 * Standard function to be called on quota_on
6296 */
617ba13b 6297static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 6298 const struct path *path)
ac27a0ec
DK		 6299{
6300 int err;
ac27a0ec
DK		 6301
6302 if (!test_opt(sb, QUOTA))
6303 return -EINVAL;
0623543b 6304
ac27a0ec 6305 /* Quotafile not on the same filesystem? */
d8c9584e 6306 if (path->dentry->d_sb != sb)
ac27a0ec 6307 return -EXDEV;
e0770e91
JK		 6308
6309 /* Quota already enabled for this file? */
6310 if (IS_NOQUOTA(d_inode(path->dentry)))
6311 return -EBUSY;
6312
0623543b
JK		 6313 /* Journaling quota? */
6314 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 6315 /* Quotafile not in fs root? */
f00c9e44 6316 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 6317 ext4_msg(sb, KERN_WARNING,
6318 "Quota file not on filesystem root. "
6319 "Journaled quota will not work");
91389240
JK		 6320 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6321 } else {
6322 /*
6323 * Clear the flag just in case mount options changed since
6324 * last time.
6325 */
6326 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 6327 }
0623543b
JK		 6328
6329 /*
6330 * When we journal data on quota file, we have to flush journal to see
6331 * all updates to the file when we bypass pagecache...
6332 */
0390131b 6333 if (EXT4_SB(sb)->s_journal &&
2b0143b5 6334 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 6335 /*
6336 * We don't need to lock updates but journal_flush() could
6337 * otherwise be livelocked...
6338 */
6339 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 6340 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 6341 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 6342 if (err)
7ffe1ea8 6343 return err;
0623543b 6344 }
957153fc 6345
daf647d2
TT		 6346 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6347 err = dquot_quota_on(sb, type, format_id, path);
957153fc 6348 if (err) {
daf647d2
TT		 6349 lockdep_set_quota_inode(path->dentry->d_inode,
6350 I_DATA_SEM_NORMAL);
957153fc
JK		 6351 } else {
6352 struct inode *inode = d_inode(path->dentry);
6353 handle_t *handle;
6354
61a92987
JK		 6355 /*
6356 * Set inode flags to prevent userspace from messing with quota
6357 * files. If this fails, we return success anyway since quotas
6358 * are already enabled and this is not a hard failure.
6359 */
957153fc
JK		 6360 inode_lock(inode);
6361 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6362 if (IS_ERR(handle))
6363 goto unlock_inode;
6364 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
6365 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
6366 S_NOATIME | S_IMMUTABLE);
4209ae12 6367 err = ext4_mark_inode_dirty(handle, inode);
957153fc
JK		 6368 ext4_journal_stop(handle);
6369 unlock_inode:
6370 inode_unlock(inode);
6371 }
daf647d2 6372 return err;
ac27a0ec
DK		 6373}
6374
7c319d32
AK		 6375static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
6376 unsigned int flags)
6377{
6378 int err;
6379 struct inode *qf_inode;
a2d4a646 6380 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 6381 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 6382 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6383 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 6384 };
6385
e2b911c5 6386 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 6387
6388 if (!qf_inums[type])
6389 return -EPERM;
6390
8a363970 6391 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32
AK		 6392 if (IS_ERR(qf_inode)) {
6393 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
6394 return PTR_ERR(qf_inode);
6395 }
6396
bcb13850
JK		 6397 /* Don't account quota for quota files to avoid recursion */
6398 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 6399 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7212b95e 6400 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
daf647d2
TT		 6401 if (err)
6402 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
61157b24 6403 iput(qf_inode);
7c319d32
AK		 6404
6405 return err;
6406}
6407
6408/* Enable usage tracking for all quota types. */
6409static int ext4_enable_quotas(struct super_block *sb)
6410{
6411 int type, err = 0;
a2d4a646 6412 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 6413 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 6414 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6415 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 6416 };
49da9392
JK		 6417 bool quota_mopt[EXT4_MAXQUOTAS] = {
6418 test_opt(sb, USRQUOTA),
6419 test_opt(sb, GRPQUOTA),
6420 test_opt(sb, PRJQUOTA),
6421 };
7c319d32 6422
91389240 6423 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 6424 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 6425 if (qf_inums[type]) {
6426 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 6427 DQUOT_USAGE_ENABLED |
6428 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 6429 if (err) {
6430 ext4_warning(sb,
72ba7450
TT		 6431 "Failed to enable quota tracking "
6432 "(type=%d, err=%d). Please run "
6433 "e2fsck to fix.", type, err);
7f144fd0
JU		 6434 for (type--; type >= 0; type--)
6435 dquot_quota_off(sb, type);
6436
7c319d32
AK		 6437 return err;
6438 }
6439 }
6440 }
6441 return 0;
6442}
6443
ca0e05e4
DM		 6444static int ext4_quota_off(struct super_block *sb, int type)
6445{
21f97697
JK		 6446 struct inode *inode = sb_dqopt(sb)->files[type];
6447 handle_t *handle;
957153fc 6448 int err;
21f97697 6449
87009d86
DM		 6450 /* Force all delayed allocation blocks to be allocated.
6451 * Caller already holds s_umount sem */
6452 if (test_opt(sb, DELALLOC))
ca0e05e4 6453 sync_filesystem(sb);
ca0e05e4 6454
957153fc 6455 if (!inode || !igrab(inode))
0b268590
AG		 6456 goto out;
6457
957153fc 6458 err = dquot_quota_off(sb, type);
964edf66 6459 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 6460 goto out_put;
6461
6462 inode_lock(inode);
61a92987
JK		 6463 /*
6464 * Update modification times of quota files when userspace can
6465 * start looking at them. If we fail, we return success anyway since
6466 * this is not a hard failure and quotas are already disabled.
6467 */
9924a92a 6468 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
4209ae12
HS		 6469 if (IS_ERR(handle)) {
6470 err = PTR_ERR(handle);
957153fc 6471 goto out_unlock;
4209ae12 6472 }
957153fc
JK		 6473 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
6474 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 6475 inode->i_mtime = inode->i_ctime = current_time(inode);
4209ae12 6476 err = ext4_mark_inode_dirty(handle, inode);
21f97697 6477 ext4_journal_stop(handle);
957153fc
JK		 6478out_unlock:
6479 inode_unlock(inode);
6480out_put:
964edf66 6481 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 6482 iput(inode);
6483 return err;
21f97697 6484out:
ca0e05e4
DM		 6485 return dquot_quota_off(sb, type);
6486}
6487
ac27a0ec
DK		 6488/* Read data from quotafile - avoid pagecache and such because we cannot afford
6489 * acquiring the locks... As quota files are never truncated and quota code
25985edc 6490 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 6491 * we don't have to be afraid of races */
617ba13b 6492static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 6493 size_t len, loff_t off)
6494{
6495 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 6496 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 6497 int offset = off & (sb->s_blocksize - 1);
6498 int tocopy;
6499 size_t toread;
6500 struct buffer_head *bh;
6501 loff_t i_size = i_size_read(inode);
6502
6503 if (off > i_size)
6504 return 0;
6505 if (off+len > i_size)
6506 len = i_size-off;
6507 toread = len;
6508 while (toread > 0) {
6509 tocopy = sb->s_blocksize - offset < toread ?
6510 sb->s_blocksize - offset : toread;
1c215028
TT		 6511 bh = ext4_bread(NULL, inode, blk, 0);
6512 if (IS_ERR(bh))
6513 return PTR_ERR(bh);
ac27a0ec
DK		 6514 if (!bh) /* A hole? */
6515 memset(data, 0, tocopy);
6516 else
6517 memcpy(data, bh->b_data+offset, tocopy);
6518 brelse(bh);
6519 offset = 0;
6520 toread -= tocopy;
6521 data += tocopy;
6522 blk++;
6523 }
6524 return len;
6525}
6526
6527/* Write to quotafile (we know the transaction is already started and has
6528 * enough credits) */
617ba13b 6529static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 6530 const char *data, size_t len, loff_t off)
6531{
6532 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 6533 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4209ae12 6534 int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
c5e298ae 6535 int retries = 0;
ac27a0ec
DK		 6536 struct buffer_head *bh;
6537 handle_t *handle = journal_current_handle();
6538
0390131b 6539 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 6540 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6541 " cancelled because transaction is not started",
9c3013e9
JK		 6542 (unsigned long long)off, (unsigned long long)len);
6543 return -EIO;
6544 }
67eeb568
DM		 6545 /*
6546 * Since we account only one data block in transaction credits,
6547 * then it is impossible to cross a block boundary.
6548 */
6549 if (sb->s_blocksize - offset < len) {
6550 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6551 " cancelled because not block aligned",
6552 (unsigned long long)off, (unsigned long long)len);
6553 return -EIO;
6554 }
6555
c5e298ae
TT		 6556 do {
6557 bh = ext4_bread(handle, inode, blk,
6558 EXT4_GET_BLOCKS_CREATE |
6559 EXT4_GET_BLOCKS_METADATA_NOFAIL);
45586c70 6560 } while (PTR_ERR(bh) == -ENOSPC &&
c5e298ae 6561 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 6562 if (IS_ERR(bh))
6563 return PTR_ERR(bh);
67eeb568
DM		 6564 if (!bh)
6565 goto out;
5d601255 6566 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 6567 err = ext4_journal_get_write_access(handle, bh);
6568 if (err) {
6569 brelse(bh);
1c215028 6570 return err;
ac27a0ec 6571 }
67eeb568
DM		 6572 lock_buffer(bh);
6573 memcpy(bh->b_data+offset, data, len);
6574 flush_dcache_page(bh->b_page);
6575 unlock_buffer(bh);
62d2b5f2 6576 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 6577 brelse(bh);
ac27a0ec 6578out:
67eeb568
DM		 6579 if (inode->i_size < off + len) {
6580 i_size_write(inode, off + len);
617ba13b 6581 EXT4_I(inode)->i_disksize = inode->i_size;
4209ae12
HS		 6582 err2 = ext4_mark_inode_dirty(handle, inode);
6583 if (unlikely(err2 && !err))
6584 err = err2;
ac27a0ec 6585 }
4209ae12 6586 return err ? err : len;
ac27a0ec 6587}
ac27a0ec
DK		 6588#endif
6589
152a0836
AV		 6590static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6591 const char *dev_name, void *data)
ac27a0ec 6592{
152a0836 6593 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 6594}
6595
c290ea01 6596#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 6597static inline void register_as_ext2(void)
6598{
6599 int err = register_filesystem(&ext2_fs_type);
6600 if (err)
6601 printk(KERN_WARNING
6602 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6603}
6604
6605static inline void unregister_as_ext2(void)
6606{
6607 unregister_filesystem(&ext2_fs_type);
6608}
2035e776
TT		 6609
6610static inline int ext2_feature_set_ok(struct super_block *sb)
6611{
e2b911c5 6612 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 6613 return 0;
bc98a42c 6614 if (sb_rdonly(sb))
2035e776 6615 return 1;
e2b911c5 6616 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 6617 return 0;
6618 return 1;
6619}
24b58424
TT		 6620#else
6621static inline void register_as_ext2(void) { }
6622static inline void unregister_as_ext2(void) { }
2035e776 6623static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 6624#endif
6625
24b58424
TT		 6626static inline void register_as_ext3(void)
6627{
6628 int err = register_filesystem(&ext3_fs_type);
6629 if (err)
6630 printk(KERN_WARNING
6631 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6632}
6633
6634static inline void unregister_as_ext3(void)
6635{
6636 unregister_filesystem(&ext3_fs_type);
6637}
2035e776
TT		 6638
6639static inline int ext3_feature_set_ok(struct super_block *sb)
6640{
e2b911c5 6641 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 6642 return 0;
e2b911c5 6643 if (!ext4_has_feature_journal(sb))
2035e776 6644 return 0;
bc98a42c 6645 if (sb_rdonly(sb))
2035e776 6646 return 1;
e2b911c5 6647 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 6648 return 0;
6649 return 1;
6650}
24b58424 6651
03010a33
TT		 6652static struct file_system_type ext4_fs_type = {
6653 .owner = THIS_MODULE,
6654 .name = "ext4",
152a0836 6655 .mount = ext4_mount,
03010a33
TT		 6656 .kill_sb = kill_block_super,
6657 .fs_flags = FS_REQUIRES_DEV,
6658};
7f78e035 6659MODULE_ALIAS_FS("ext4");
03010a33 6660
e9e3bcec
ES		 6661/* Shared across all ext4 file systems */
6662wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 6663
5dabfc78 6664static int __init ext4_init_fs(void)
ac27a0ec 6665{
e9e3bcec 6666 int i, err;
c9de560d 6667
e294a537 6668 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 6669 ext4_li_info = NULL;
6670 mutex_init(&ext4_li_mtx);
6671
9a4c8019 6672 /* Build-time check for flags consistency */
12e9b892 6673 ext4_check_flag_values();
e9e3bcec 6674
e142d052 6675 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 6676 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 6677
51865fda 6678 err = ext4_init_es();
6fd058f7
TT		 6679 if (err)
6680 return err;
51865fda 6681
1dc0aa46 6682 err = ext4_init_pending();
22cfe4b4
EB		 6683 if (err)
6684 goto out7;
6685
6686 err = ext4_init_post_read_processing();
1dc0aa46
EW		 6687 if (err)
6688 goto out6;
6689
51865fda
ZL		 6690 err = ext4_init_pageio();
6691 if (err)
b5799018 6692 goto out5;
51865fda 6693
5dabfc78 6694 err = ext4_init_system_zone();
bd2d0210 6695 if (err)
b5799018 6696 goto out4;
857ac889 6697
b5799018 6698 err = ext4_init_sysfs();
dd68314c 6699 if (err)
b5799018 6700 goto out3;
857ac889 6701
5dabfc78 6702 err = ext4_init_mballoc();
c9de560d
AT		 6703 if (err)
6704 goto out2;
ac27a0ec
DK		 6705 err = init_inodecache();
6706 if (err)
6707 goto out1;
aa75f4d3
HS		 6708
6709 err = ext4_fc_init_dentry_cache();
6710 if (err)
6711 goto out05;
6712
24b58424 6713 register_as_ext3();
2035e776 6714 register_as_ext2();
03010a33 6715 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 6716 if (err)
6717 goto out;
bfff6873 6718
ac27a0ec
DK		 6719 return 0;
6720out:
24b58424
TT		 6721 unregister_as_ext2();
6722 unregister_as_ext3();
aa75f4d3 6723out05:
ac27a0ec
DK		 6724 destroy_inodecache();
6725out1:
5dabfc78 6726 ext4_exit_mballoc();
9c191f70 6727out2:
b5799018
TT		 6728 ext4_exit_sysfs();
6729out3:
5dabfc78 6730 ext4_exit_system_zone();
b5799018 6731out4:
5dabfc78 6732 ext4_exit_pageio();
b5799018 6733out5:
22cfe4b4 6734 ext4_exit_post_read_processing();
1dc0aa46 6735out6:
22cfe4b4
EB		 6736 ext4_exit_pending();
6737out7:
51865fda
ZL		 6738 ext4_exit_es();
6739
ac27a0ec
DK		 6740 return err;
6741}
6742
5dabfc78 6743static void __exit ext4_exit_fs(void)
ac27a0ec 6744{
bfff6873 6745 ext4_destroy_lazyinit_thread();
24b58424
TT		 6746 unregister_as_ext2();
6747 unregister_as_ext3();
03010a33 6748 unregister_filesystem(&ext4_fs_type);
ac27a0ec 6749 destroy_inodecache();
5dabfc78 6750 ext4_exit_mballoc();
b5799018 6751 ext4_exit_sysfs();
5dabfc78
TT		 6752 ext4_exit_system_zone();
6753 ext4_exit_pageio();
22cfe4b4 6754 ext4_exit_post_read_processing();
dd12ed14 6755 ext4_exit_es();
1dc0aa46 6756 ext4_exit_pending();
ac27a0ec
DK		 6757}
6758
6759MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 6760MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 6761MODULE_LICENSE("GPL");
7ef79ad5 6762MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 6763module_init(ext4_init_fs)
6764module_exit(ext4_exit_fs)
Linux 6.x block layer and io_uring tree(s)