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Merge tag 'drm-next-2019-09-27' of git://anongit.freedesktop.org/drm/drm
[linux-2.6-block.git] / fs / ext4 / super.c
CommitLineData
f5166768 1// SPDX-License-Identifier: GPL-2.0
ac27a0ec 2/*
617ba13b 3 * linux/fs/ext4/super.c
ac27a0ec
DK		 4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
c5ca7c76 24#include <linux/vmalloc.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
66114cad 28#include <linux/backing-dev.h>
ac27a0ec 29#include <linux/parser.h>
ac27a0ec 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ef510424 41#include <linux/dax.h>
7abc52c2 42#include <linux/cleancache.h>
7c0f6ba6 43#include <linux/uaccess.h>
ee73f9a5 44#include <linux/iversion.h>
c83ad55e 45#include <linux/unicode.h>
ac27a0ec 46
bfff6873
LC		 47#include <linux/kthread.h>
48#include <linux/freezer.h>
49
3dcf5451 50#include "ext4.h"
4a092d73 51#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 52#include "ext4_jbd2.h"
ac27a0ec
DK		 53#include "xattr.h"
54#include "acl.h"
3661d286 55#include "mballoc.h"
0c9ec4be 56#include "fsmap.h"
ac27a0ec 57
9bffad1e
TT		 58#define CREATE_TRACE_POINTS
59#include <trace/events/ext4.h>
60
0b75a840
LC		 61static struct ext4_lazy_init *ext4_li_info;
62static struct mutex ext4_li_mtx;
e294a537 63static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 64
617ba13b 65static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 66 unsigned long journal_devnum);
2adf6da8 67static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 68static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 69static void ext4_mark_recovery_complete(struct super_block *sb,
70 struct ext4_super_block *es);
71static void ext4_clear_journal_err(struct super_block *sb,
72 struct ext4_super_block *es);
617ba13b 73static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
c6cb7e77
EW		 86static struct inode *ext4_get_journal_inode(struct super_block *sb,
87 unsigned int journal_inum);
ac27a0ec 88
e74031fd
JK		 89/*
90 * Lock ordering
91 *
92 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
93 * i_mmap_rwsem (inode->i_mmap_rwsem)!
94 *
95 * page fault path:
96 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
97 * page lock -> i_data_sem (rw)
98 *
99 * buffered write path:
100 * sb_start_write -> i_mutex -> mmap_sem
101 * sb_start_write -> i_mutex -> transaction start -> page lock ->
102 * i_data_sem (rw)
103 *
104 * truncate:
1d39834f
NB		 105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
106 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
107 * i_data_sem (rw)
e74031fd
JK		 108 *
109 * direct IO:
1d39834f
NB		 110 * sb_start_write -> i_mutex -> mmap_sem
111 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
e74031fd
JK		 112 *
113 * writepages:
114 * transaction start -> page lock(s) -> i_data_sem (rw)
115 */
116
c290ea01 117#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 118static struct file_system_type ext2_fs_type = {
119 .owner = THIS_MODULE,
120 .name = "ext2",
121 .mount = ext4_mount,
122 .kill_sb = kill_block_super,
123 .fs_flags = FS_REQUIRES_DEV,
124};
7f78e035 125MODULE_ALIAS_FS("ext2");
fa7614dd 126MODULE_ALIAS("ext2");
2035e776
TT		 127#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
128#else
129#define IS_EXT2_SB(sb) (0)
130#endif
131
132
ba69f9ab
JK		 133static struct file_system_type ext3_fs_type = {
134 .owner = THIS_MODULE,
135 .name = "ext3",
152a0836 136 .mount = ext4_mount,
ba69f9ab
JK		 137 .kill_sb = kill_block_super,
138 .fs_flags = FS_REQUIRES_DEV,
139};
7f78e035 140MODULE_ALIAS_FS("ext3");
fa7614dd 141MODULE_ALIAS("ext3");
ba69f9ab 142#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 143
fb265c9c
TT		 144/*
145 * This works like sb_bread() except it uses ERR_PTR for error
146 * returns. Currently with sb_bread it's impossible to distinguish
147 * between ENOMEM and EIO situations (since both result in a NULL
148 * return.
149 */
150struct buffer_head *
151ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
152{
153 struct buffer_head *bh = sb_getblk(sb, block);
154
155 if (bh == NULL)
156 return ERR_PTR(-ENOMEM);
157 if (buffer_uptodate(bh))
158 return bh;
159 ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
160 wait_on_buffer(bh);
161 if (buffer_uptodate(bh))
162 return bh;
163 put_bh(bh);
164 return ERR_PTR(-EIO);
165}
166
d25425f8
DW		 167static int ext4_verify_csum_type(struct super_block *sb,
168 struct ext4_super_block *es)
169{
e2b911c5 170 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 171 return 1;
172
173 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
174}
175
a9c47317
DW		 176static __le32 ext4_superblock_csum(struct super_block *sb,
177 struct ext4_super_block *es)
178{
179 struct ext4_sb_info *sbi = EXT4_SB(sb);
180 int offset = offsetof(struct ext4_super_block, s_checksum);
181 __u32 csum;
182
183 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
184
185 return cpu_to_le32(csum);
186}
187
c197855e
SH		 188static int ext4_superblock_csum_verify(struct super_block *sb,
189 struct ext4_super_block *es)
a9c47317 190{
9aa5d32b 191 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 192 return 1;
193
194 return es->s_checksum == ext4_superblock_csum(sb, es);
195}
196
06db49e6 197void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 198{
06db49e6
TT		 199 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
200
9aa5d32b 201 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 202 return;
203
204 es->s_checksum = ext4_superblock_csum(sb, es);
205}
206
9933fc0a
TT		 207void *ext4_kvmalloc(size_t size, gfp_t flags)
208{
209 void *ret;
210
8be04b93 211 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 212 if (!ret)
213 ret = __vmalloc(size, flags, PAGE_KERNEL);
214 return ret;
215}
216
217void *ext4_kvzalloc(size_t size, gfp_t flags)
218{
219 void *ret;
220
8be04b93 221 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 222 if (!ret)
223 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
224 return ret;
225}
226
8fadc143
AR		 227ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
228 struct ext4_group_desc *bg)
bd81d8ee 229{
3a14589c 230 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 232 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 233}
234
8fadc143
AR		 235ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
236 struct ext4_group_desc *bg)
bd81d8ee 237{
5272f837 238 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 240 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 241}
242
8fadc143
AR		 243ext4_fsblk_t ext4_inode_table(struct super_block *sb,
244 struct ext4_group_desc *bg)
bd81d8ee 245{
5272f837 246 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 248 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 249}
250
021b65bb
TT		 251__u32 ext4_free_group_clusters(struct super_block *sb,
252 struct ext4_group_desc *bg)
560671a0
AK		 253{
254 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 256 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 257}
258
259__u32 ext4_free_inodes_count(struct super_block *sb,
260 struct ext4_group_desc *bg)
261{
262 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
263 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 264 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 265}
266
267__u32 ext4_used_dirs_count(struct super_block *sb,
268 struct ext4_group_desc *bg)
269{
270 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
271 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 272 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 273}
274
275__u32 ext4_itable_unused_count(struct super_block *sb,
276 struct ext4_group_desc *bg)
277{
278 return le16_to_cpu(bg->bg_itable_unused_lo) |
279 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 280 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 281}
282
8fadc143
AR		 283void ext4_block_bitmap_set(struct super_block *sb,
284 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 285{
3a14589c 286 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 289}
290
8fadc143
AR		 291void ext4_inode_bitmap_set(struct super_block *sb,
292 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 293{
5272f837 294 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 297}
298
8fadc143
AR		 299void ext4_inode_table_set(struct super_block *sb,
300 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 301{
5272f837 302 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 305}
306
021b65bb
TT		 307void ext4_free_group_clusters_set(struct super_block *sb,
308 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 309{
310 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
313}
314
315void ext4_free_inodes_set(struct super_block *sb,
316 struct ext4_group_desc *bg, __u32 count)
317{
318 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
319 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
320 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
321}
322
323void ext4_used_dirs_set(struct super_block *sb,
324 struct ext4_group_desc *bg, __u32 count)
325{
326 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
327 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
328 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
329}
330
331void ext4_itable_unused_set(struct super_block *sb,
332 struct ext4_group_desc *bg, __u32 count)
333{
334 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
335 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
336 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
337}
338
6a0678a7
AB		 339static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
340{
341 time64_t now = ktime_get_real_seconds();
342
343 now = clamp_val(now, 0, (1ull << 40) - 1);
344
345 *lo = cpu_to_le32(lower_32_bits(now));
346 *hi = upper_32_bits(now);
347}
348
349static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
350{
351 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
352}
353#define ext4_update_tstamp(es, tstamp) \
354 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
355#define ext4_get_tstamp(es, tstamp) \
356 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
d3d1faf6 357
1c13d5c0
TT		 358static void __save_error_info(struct super_block *sb, const char *func,
359 unsigned int line)
360{
361 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
362
363 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 364 if (bdev_read_only(sb->s_bdev))
365 return;
1c13d5c0 366 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6a0678a7 367 ext4_update_tstamp(es, s_last_error_time);
1c13d5c0
TT		 368 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
369 es->s_last_error_line = cpu_to_le32(line);
370 if (!es->s_first_error_time) {
371 es->s_first_error_time = es->s_last_error_time;
6a0678a7 372 es->s_first_error_time_hi = es->s_last_error_time_hi;
1c13d5c0
TT		 373 strncpy(es->s_first_error_func, func,
374 sizeof(es->s_first_error_func));
375 es->s_first_error_line = cpu_to_le32(line);
376 es->s_first_error_ino = es->s_last_error_ino;
377 es->s_first_error_block = es->s_last_error_block;
378 }
66e61a9e
TT		 379 /*
380 * Start the daily error reporting function if it hasn't been
381 * started already
382 */
383 if (!es->s_error_count)
384 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 385 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 386}
387
388static void save_error_info(struct super_block *sb, const char *func,
389 unsigned int line)
390{
391 __save_error_info(sb, func, line);
392 ext4_commit_super(sb, 1);
393}
394
bdfe0cbd
TT		 395/*
396 * The del_gendisk() function uninitializes the disk-specific data
397 * structures, including the bdi structure, without telling anyone
398 * else. Once this happens, any attempt to call mark_buffer_dirty()
399 * (for example, by ext4_commit_super), will cause a kernel OOPS.
400 * This is a kludge to prevent these oops until we can put in a proper
401 * hook in del_gendisk() to inform the VFS and file system layers.
402 */
403static int block_device_ejected(struct super_block *sb)
404{
405 struct inode *bd_inode = sb->s_bdev->bd_inode;
406 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
407
408 return bdi->dev == NULL;
409}
410
18aadd47
BJ		 411static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
412{
413 struct super_block *sb = journal->j_private;
414 struct ext4_sb_info *sbi = EXT4_SB(sb);
415 int error = is_journal_aborted(journal);
5d3ee208 416 struct ext4_journal_cb_entry *jce;
18aadd47 417
5d3ee208 418 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 419
420 ext4_process_freed_data(sb, txn->t_tid);
421
18aadd47 422 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 423 while (!list_empty(&txn->t_private_list)) {
424 jce = list_entry(txn->t_private_list.next,
425 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 426 list_del_init(&jce->jce_list);
427 spin_unlock(&sbi->s_md_lock);
428 jce->jce_func(sb, jce, error);
429 spin_lock(&sbi->s_md_lock);
430 }
431 spin_unlock(&sbi->s_md_lock);
432}
1c13d5c0 433
1dc1097f
JK		 434static bool system_going_down(void)
435{
436 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
437 || system_state == SYSTEM_RESTART;
438}
439
ac27a0ec
DK		 440/* Deal with the reporting of failure conditions on a filesystem such as
441 * inconsistencies detected or read IO failures.
442 *
443 * On ext2, we can store the error state of the filesystem in the
617ba13b 444 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 445 * write ordering constraints on the superblock which prevent us from
446 * writing it out straight away; and given that the journal is about to
447 * be aborted, we can't rely on the current, or future, transactions to
448 * write out the superblock safely.
449 *
dab291af 450 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 451 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 452 * that error until we've noted it down and cleared it.
453 */
454
617ba13b 455static void ext4_handle_error(struct super_block *sb)
ac27a0ec 456{
327eaf73
TT		 457 if (test_opt(sb, WARN_ON_ERROR))
458 WARN_ON_ONCE(1);
459
bc98a42c 460 if (sb_rdonly(sb))
ac27a0ec
DK		 461 return;
462
2b2d6d01 463 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 464 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 465
4ab2f15b 466 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 467 if (journal)
dab291af 468 jbd2_journal_abort(journal, -EIO);
ac27a0ec 469 }
1dc1097f
JK		 470 /*
471 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
472 * could panic during 'reboot -f' as the underlying device got already
473 * disabled.
474 */
475 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
b31e1552 476 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 477 /*
478 * Make sure updated value of ->s_mount_flags will be visible
479 * before ->s_flags update
480 */
481 smp_wmb();
1751e8a6 482 sb->s_flags |= SB_RDONLY;
1dc1097f 483 } else if (test_opt(sb, ERRORS_PANIC)) {
4327ba52
DJ		 484 if (EXT4_SB(sb)->s_journal &&
485 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
486 return;
617ba13b 487 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 488 sb->s_id);
4327ba52 489 }
ac27a0ec
DK		 490}
491
efbed4dc
TT		 492#define ext4_error_ratelimit(sb) \
493 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
494 "EXT4-fs error")
495
12062ddd 496void __ext4_error(struct super_block *sb, const char *function,
c398eda0 497 unsigned int line, const char *fmt, ...)
ac27a0ec 498{
0ff2ea7d 499 struct va_format vaf;
ac27a0ec
DK		 500 va_list args;
501
0db1ff22
TT		 502 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
503 return;
504
ccf0f32a 505 trace_ext4_error(sb, function, line);
efbed4dc
TT		 506 if (ext4_error_ratelimit(sb)) {
507 va_start(args, fmt);
508 vaf.fmt = fmt;
509 vaf.va = &args;
510 printk(KERN_CRIT
511 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
512 sb->s_id, function, line, current->comm, &vaf);
513 va_end(args);
514 }
f3fc0210 515 save_error_info(sb, function, line);
617ba13b 516 ext4_handle_error(sb);
ac27a0ec
DK		 517}
518
e7c96e8e
JP		 519void __ext4_error_inode(struct inode *inode, const char *function,
520 unsigned int line, ext4_fsblk_t block,
521 const char *fmt, ...)
273df556
FM		 522{
523 va_list args;
f7c21177 524 struct va_format vaf;
1c13d5c0 525 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 526
0db1ff22
TT		 527 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
528 return;
529
ccf0f32a 530 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 531 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
532 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 533 if (ext4_error_ratelimit(inode->i_sb)) {
534 va_start(args, fmt);
535 vaf.fmt = fmt;
536 vaf.va = &args;
537 if (block)
538 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
539 "inode #%lu: block %llu: comm %s: %pV\n",
540 inode->i_sb->s_id, function, line, inode->i_ino,
541 block, current->comm, &vaf);
542 else
543 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
544 "inode #%lu: comm %s: %pV\n",
545 inode->i_sb->s_id, function, line, inode->i_ino,
546 current->comm, &vaf);
547 va_end(args);
548 }
1c13d5c0 549 save_error_info(inode->i_sb, function, line);
273df556
FM		 550 ext4_handle_error(inode->i_sb);
551}
552
e7c96e8e
JP		 553void __ext4_error_file(struct file *file, const char *function,
554 unsigned int line, ext4_fsblk_t block,
555 const char *fmt, ...)
273df556
FM		 556{
557 va_list args;
f7c21177 558 struct va_format vaf;
1c13d5c0 559 struct ext4_super_block *es;
496ad9aa 560 struct inode *inode = file_inode(file);
273df556
FM		 561 char pathname[80], *path;
562
0db1ff22
TT		 563 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
564 return;
565
ccf0f32a 566 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 567 es = EXT4_SB(inode->i_sb)->s_es;
568 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 569 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 570 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 571 if (IS_ERR(path))
572 path = "(unknown)";
573 va_start(args, fmt);
574 vaf.fmt = fmt;
575 vaf.va = &args;
576 if (block)
577 printk(KERN_CRIT
578 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
579 "block %llu: comm %s: path %s: %pV\n",
580 inode->i_sb->s_id, function, line, inode->i_ino,
581 block, current->comm, path, &vaf);
582 else
583 printk(KERN_CRIT
584 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
585 "comm %s: path %s: %pV\n",
586 inode->i_sb->s_id, function, line, inode->i_ino,
587 current->comm, path, &vaf);
588 va_end(args);
589 }
1c13d5c0 590 save_error_info(inode->i_sb, function, line);
273df556
FM		 591 ext4_handle_error(inode->i_sb);
592}
593
722887dd
TT		 594const char *ext4_decode_error(struct super_block *sb, int errno,
595 char nbuf[16])
ac27a0ec
DK		 596{
597 char *errstr = NULL;
598
599 switch (errno) {
6a797d27
DW		 600 case -EFSCORRUPTED:
601 errstr = "Corrupt filesystem";
602 break;
603 case -EFSBADCRC:
604 errstr = "Filesystem failed CRC";
605 break;
ac27a0ec
DK		 606 case -EIO:
607 errstr = "IO failure";
608 break;
609 case -ENOMEM:
610 errstr = "Out of memory";
611 break;
612 case -EROFS:
78f1ddbb
TT		 613 if (!sb || (EXT4_SB(sb)->s_journal &&
614 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 615 errstr = "Journal has aborted";
616 else
617 errstr = "Readonly filesystem";
618 break;
619 default:
620 /* If the caller passed in an extra buffer for unknown
621 * errors, textualise them now. Else we just return
622 * NULL. */
623 if (nbuf) {
624 /* Check for truncated error codes... */
625 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
626 errstr = nbuf;
627 }
628 break;
629 }
630
631 return errstr;
632}
633
617ba13b 634/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 635 * automatically and invokes the appropriate error response. */
636
c398eda0
TT		 637void __ext4_std_error(struct super_block *sb, const char *function,
638 unsigned int line, int errno)
ac27a0ec
DK		 639{
640 char nbuf[16];
641 const char *errstr;
642
0db1ff22
TT		 643 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
644 return;
645
ac27a0ec
DK		 646 /* Special case: if the error is EROFS, and we're not already
647 * inside a transaction, then there's really no point in logging
648 * an error. */
bc98a42c 649 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 650 return;
651
efbed4dc
TT		 652 if (ext4_error_ratelimit(sb)) {
653 errstr = ext4_decode_error(sb, errno, nbuf);
654 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
655 sb->s_id, function, line, errstr);
656 }
ac27a0ec 657
efbed4dc 658 save_error_info(sb, function, line);
617ba13b 659 ext4_handle_error(sb);
ac27a0ec
DK		 660}
661
662/*
617ba13b 663 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 664 * abort function may be used to deal with unrecoverable failures such
665 * as journal IO errors or ENOMEM at a critical moment in log management.
666 *
667 * We unconditionally force the filesystem into an ABORT|READONLY state,
668 * unless the error response on the fs has been set to panic in which
669 * case we take the easy way out and panic immediately.
670 */
671
c67d859e 672void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 673 unsigned int line, const char *fmt, ...)
ac27a0ec 674{
651e1c3b 675 struct va_format vaf;
ac27a0ec
DK		 676 va_list args;
677
0db1ff22
TT		 678 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
679 return;
680
1c13d5c0 681 save_error_info(sb, function, line);
ac27a0ec 682 va_start(args, fmt);
651e1c3b
JP		 683 vaf.fmt = fmt;
684 vaf.va = &args;
685 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
686 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 687 va_end(args);
688
bc98a42c 689 if (sb_rdonly(sb) == 0) {
1c13d5c0 690 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 691 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 692 /*
693 * Make sure updated value of ->s_mount_flags will be visible
694 * before ->s_flags update
695 */
696 smp_wmb();
1751e8a6 697 sb->s_flags |= SB_RDONLY;
1c13d5c0
TT		 698 if (EXT4_SB(sb)->s_journal)
699 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
700 save_error_info(sb, function, line);
701 }
2c1d0e36 702 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
4327ba52
DJ		 703 if (EXT4_SB(sb)->s_journal &&
704 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
705 return;
617ba13b 706 panic("EXT4-fs panic from previous error\n");
4327ba52 707 }
ac27a0ec
DK		 708}
709
e7c96e8e
JP		 710void __ext4_msg(struct super_block *sb,
711 const char *prefix, const char *fmt, ...)
b31e1552 712{
0ff2ea7d 713 struct va_format vaf;
b31e1552
ES		 714 va_list args;
715
efbed4dc
TT		 716 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
717 return;
718
b31e1552 719 va_start(args, fmt);
0ff2ea7d
JP		 720 vaf.fmt = fmt;
721 vaf.va = &args;
722 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 723 va_end(args);
724}
725
b03a2f7e
AD		 726#define ext4_warning_ratelimit(sb) \
727 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
728 "EXT4-fs warning")
729
12062ddd 730void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 731 unsigned int line, const char *fmt, ...)
ac27a0ec 732{
0ff2ea7d 733 struct va_format vaf;
ac27a0ec
DK		 734 va_list args;
735
b03a2f7e 736 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 737 return;
738
ac27a0ec 739 va_start(args, fmt);
0ff2ea7d
JP		 740 vaf.fmt = fmt;
741 vaf.va = &args;
742 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
743 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 744 va_end(args);
745}
746
b03a2f7e
AD		 747void __ext4_warning_inode(const struct inode *inode, const char *function,
748 unsigned int line, const char *fmt, ...)
749{
750 struct va_format vaf;
751 va_list args;
752
753 if (!ext4_warning_ratelimit(inode->i_sb))
754 return;
755
756 va_start(args, fmt);
757 vaf.fmt = fmt;
758 vaf.va = &args;
759 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
760 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
761 function, line, inode->i_ino, current->comm, &vaf);
762 va_end(args);
763}
764
e29136f8
TT		 765void __ext4_grp_locked_error(const char *function, unsigned int line,
766 struct super_block *sb, ext4_group_t grp,
767 unsigned long ino, ext4_fsblk_t block,
768 const char *fmt, ...)
5d1b1b3f
AK		 769__releases(bitlock)
770__acquires(bitlock)
771{
0ff2ea7d 772 struct va_format vaf;
5d1b1b3f
AK		 773 va_list args;
774 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
775
0db1ff22
TT		 776 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
777 return;
778
ccf0f32a 779 trace_ext4_error(sb, function, line);
1c13d5c0
TT		 780 es->s_last_error_ino = cpu_to_le32(ino);
781 es->s_last_error_block = cpu_to_le64(block);
782 __save_error_info(sb, function, line);
0ff2ea7d 783
efbed4dc
TT		 784 if (ext4_error_ratelimit(sb)) {
785 va_start(args, fmt);
786 vaf.fmt = fmt;
787 vaf.va = &args;
788 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
789 sb->s_id, function, line, grp);
790 if (ino)
791 printk(KERN_CONT "inode %lu: ", ino);
792 if (block)
793 printk(KERN_CONT "block %llu:",
794 (unsigned long long) block);
795 printk(KERN_CONT "%pV\n", &vaf);
796 va_end(args);
797 }
5d1b1b3f 798
327eaf73
TT		 799 if (test_opt(sb, WARN_ON_ERROR))
800 WARN_ON_ONCE(1);
801
5d1b1b3f 802 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 803 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 804 return;
805 }
1c13d5c0 806
5d1b1b3f 807 ext4_unlock_group(sb, grp);
06f29cc8 808 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 809 ext4_handle_error(sb);
810 /*
811 * We only get here in the ERRORS_RO case; relocking the group
812 * may be dangerous, but nothing bad will happen since the
813 * filesystem will have already been marked read/only and the
814 * journal has been aborted. We return 1 as a hint to callers
815 * who might what to use the return value from
25985edc 816 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 817 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
818 * aggressively from the ext4 function in question, with a
819 * more appropriate error code.
820 */
821 ext4_lock_group(sb, grp);
822 return;
823}
824
db79e6d1
WS		 825void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
826 ext4_group_t group,
827 unsigned int flags)
828{
829 struct ext4_sb_info *sbi = EXT4_SB(sb);
830 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
831 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
9af0b3d1
WS		 832 int ret;
833
834 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
835 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
836 &grp->bb_state);
837 if (!ret)
838 percpu_counter_sub(&sbi->s_freeclusters_counter,
839 grp->bb_free);
db79e6d1
WS		 840 }
841
9af0b3d1
WS		 842 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
843 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
844 &grp->bb_state);
845 if (!ret && gdp) {
db79e6d1
WS		 846 int count;
847
848 count = ext4_free_inodes_count(sb, gdp);
849 percpu_counter_sub(&sbi->s_freeinodes_counter,
850 count);
851 }
db79e6d1
WS		 852 }
853}
854
617ba13b 855void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 856{
617ba13b 857 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 858
617ba13b 859 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 860 return;
861
12062ddd 862 ext4_warning(sb,
ac27a0ec
DK		 863 "updating to rev %d because of new feature flag, "
864 "running e2fsck is recommended",
617ba13b 865 EXT4_DYNAMIC_REV);
ac27a0ec 866
617ba13b
MC		 867 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
868 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
869 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 870 /* leave es->s_feature_*compat flags alone */
871 /* es->s_uuid will be set by e2fsck if empty */
872
873 /*
874 * The rest of the superblock fields should be zero, and if not it
875 * means they are likely already in use, so leave them alone. We
876 * can leave it up to e2fsck to clean up any inconsistencies there.
877 */
878}
879
880/*
881 * Open the external journal device
882 */
b31e1552 883static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 884{
885 struct block_device *bdev;
886 char b[BDEVNAME_SIZE];
887
d4d77629 888 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 889 if (IS_ERR(bdev))
890 goto fail;
891 return bdev;
892
893fail:
b31e1552 894 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 895 __bdevname(dev, b), PTR_ERR(bdev));
896 return NULL;
897}
898
899/*
900 * Release the journal device
901 */
4385bab1 902static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 903{
4385bab1 904 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 905}
906
4385bab1 907static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 908{
909 struct block_device *bdev;
ac27a0ec
DK		 910 bdev = sbi->journal_bdev;
911 if (bdev) {
4385bab1 912 ext4_blkdev_put(bdev);
ac27a0ec
DK		 913 sbi->journal_bdev = NULL;
914 }
ac27a0ec
DK		 915}
916
917static inline struct inode *orphan_list_entry(struct list_head *l)
918{
617ba13b 919 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 920}
921
617ba13b 922static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 923{
924 struct list_head *l;
925
b31e1552
ES		 926 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
927 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 928
929 printk(KERN_ERR "sb_info orphan list:\n");
930 list_for_each(l, &sbi->s_orphan) {
931 struct inode *inode = orphan_list_entry(l);
932 printk(KERN_ERR " "
933 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
934 inode->i_sb->s_id, inode->i_ino, inode,
935 inode->i_mode, inode->i_nlink,
936 NEXT_ORPHAN(inode));
937 }
938}
939
957153fc
JK		 940#ifdef CONFIG_QUOTA
941static int ext4_quota_off(struct super_block *sb, int type);
942
943static inline void ext4_quota_off_umount(struct super_block *sb)
944{
945 int type;
946
964edf66
JK		 947 /* Use our quota_off function to clear inode flags etc. */
948 for (type = 0; type < EXT4_MAXQUOTAS; type++)
949 ext4_quota_off(sb, type);
957153fc 950}
33458eab
TT		 951
952/*
953 * This is a helper function which is used in the mount/remount
954 * codepaths (which holds s_umount) to fetch the quota file name.
955 */
956static inline char *get_qf_name(struct super_block *sb,
957 struct ext4_sb_info *sbi,
958 int type)
959{
960 return rcu_dereference_protected(sbi->s_qf_names[type],
961 lockdep_is_held(&sb->s_umount));
962}
957153fc
JK		 963#else
964static inline void ext4_quota_off_umount(struct super_block *sb)
965{
966}
967#endif
968
2b2d6d01 969static void ext4_put_super(struct super_block *sb)
ac27a0ec 970{
617ba13b
MC		 971 struct ext4_sb_info *sbi = EXT4_SB(sb);
972 struct ext4_super_block *es = sbi->s_es;
97abd7d4 973 int aborted = 0;
ef2cabf7 974 int i, err;
ac27a0ec 975
857ac889 976 ext4_unregister_li_request(sb);
957153fc 977 ext4_quota_off_umount(sb);
e0ccfd95 978
2e8fa54e 979 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 980
0390131b 981 if (sbi->s_journal) {
97abd7d4 982 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 983 err = jbd2_journal_destroy(sbi->s_journal);
984 sbi->s_journal = NULL;
97abd7d4 985 if ((err < 0) && !aborted)
c67d859e 986 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 987 }
d4edac31 988
ebd173be 989 ext4_unregister_sysfs(sb);
d3922a77 990 ext4_es_unregister_shrinker(sbi);
9105bb14 991 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 992 ext4_release_system_zone(sb);
993 ext4_mb_release(sb);
994 ext4_ext_release(sb);
d4edac31 995
bc98a42c 996 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 997 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 998 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 999 }
bc98a42c 1000 if (!sb_rdonly(sb))
a8e25a83
AB		 1001 ext4_commit_super(sb, 1);
1002
ac27a0ec
DK		 1003 for (i = 0; i < sbi->s_gdb_count; i++)
1004 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 1005 kvfree(sbi->s_group_desc);
1006 kvfree(sbi->s_flex_groups);
57042651 1007 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 1008 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1009 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 1010 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 1011 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 1012#ifdef CONFIG_QUOTA
a2d4a646 1013 for (i = 0; i < EXT4_MAXQUOTAS; i++)
33458eab 1014 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 1015#endif
1016
1017 /* Debugging code just in case the in-memory inode orphan list
1018 * isn't empty. The on-disk one can be non-empty if we've
1019 * detected an error and taken the fs readonly, but the
1020 * in-memory list had better be clean by this point. */
1021 if (!list_empty(&sbi->s_orphan))
1022 dump_orphan_list(sb, sbi);
1023 J_ASSERT(list_empty(&sbi->s_orphan));
1024
89d96a6f 1025 sync_blockdev(sb->s_bdev);
f98393a6 1026 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 1027 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1028 /*
1029 * Invalidate the journal device's buffers. We don't want them
1030 * floating about in memory - the physical journal device may
1031 * hotswapped, and it breaks the `ro-after' testing code.
1032 */
1033 sync_blockdev(sbi->journal_bdev);
f98393a6 1034 invalidate_bdev(sbi->journal_bdev);
617ba13b 1035 ext4_blkdev_remove(sbi);
ac27a0ec 1036 }
50c15df6
CX		 1037
1038 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1039 sbi->s_ea_inode_cache = NULL;
1040
1041 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1042 sbi->s_ea_block_cache = NULL;
1043
c5e06d10
JL		 1044 if (sbi->s_mmp_tsk)
1045 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 1046 brelse(sbi->s_sbh);
ac27a0ec 1047 sb->s_fs_info = NULL;
3197ebdb
TT		 1048 /*
1049 * Now that we are completely done shutting down the
1050 * superblock, we need to actually destroy the kobject.
1051 */
3197ebdb
TT		 1052 kobject_put(&sbi->s_kobj);
1053 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1054 if (sbi->s_chksum_driver)
1055 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1056 kfree(sbi->s_blockgroup_lock);
5e405595 1057 fs_put_dax(sbi->s_daxdev);
c83ad55e
GKB		 1058#ifdef CONFIG_UNICODE
1059 utf8_unload(sbi->s_encoding);
1060#endif
ac27a0ec 1061 kfree(sbi);
ac27a0ec
DK		 1062}
1063
e18b890b 1064static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1065
1066/*
1067 * Called inside transaction, so use GFP_NOFS
1068 */
617ba13b 1069static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1070{
617ba13b 1071 struct ext4_inode_info *ei;
ac27a0ec 1072
e6b4f8da 1073 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1074 if (!ei)
1075 return NULL;
0b8e58a1 1076
ee73f9a5 1077 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 1078 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 1079 INIT_LIST_HEAD(&ei->i_prealloc_list);
1080 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1081 ext4_es_init_tree(&ei->i_es_tree);
1082 rwlock_init(&ei->i_es_lock);
edaa53ca 1083 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1084 ei->i_es_all_nr = 0;
edaa53ca 1085 ei->i_es_shk_nr = 0;
dd475925 1086 ei->i_es_shrink_lblk = 0;
d2a17637 1087 ei->i_reserved_data_blocks = 0;
9d0be502 1088 ei->i_da_metadata_calc_len = 0;
7e731bc9 1089 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 1090 spin_lock_init(&(ei->i_block_reservation_lock));
1dc0aa46 1091 ext4_init_pending_tree(&ei->i_pending_tree);
a9e7f447
DM		 1092#ifdef CONFIG_QUOTA
1093 ei->i_reserved_quota = 0;
96c7e0d9 1094 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1095#endif
8aefcd55 1096 ei->jinode = NULL;
2e8fa54e 1097 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1098 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1099 ei->i_sync_tid = 0;
1100 ei->i_datasync_tid = 0;
e27f41e1 1101 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1102 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 1103 return &ei->vfs_inode;
1104}
1105
7ff9c073
TT		 1106static int ext4_drop_inode(struct inode *inode)
1107{
1108 int drop = generic_drop_inode(inode);
1109
29b3692e
EB		 1110 if (!drop)
1111 drop = fscrypt_drop_inode(inode);
1112
7ff9c073
TT		 1113 trace_ext4_drop_inode(inode, drop);
1114 return drop;
1115}
1116
94053139 1117static void ext4_free_in_core_inode(struct inode *inode)
fa0d7e3d 1118{
2c58d548 1119 fscrypt_free_inode(inode);
fa0d7e3d
NP		 1120 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1121}
1122
617ba13b 1123static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1124{
9f7dd93d 1125 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1126 ext4_msg(inode->i_sb, KERN_ERR,
1127 "Inode %lu (%p): orphan list check failed!",
1128 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1129 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1130 EXT4_I(inode), sizeof(struct ext4_inode_info),
1131 true);
1132 dump_stack();
1133 }
ac27a0ec
DK		 1134}
1135
51cc5068 1136static void init_once(void *foo)
ac27a0ec 1137{
617ba13b 1138 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1139
a35afb83 1140 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1141 init_rwsem(&ei->xattr_sem);
0e855ac8 1142 init_rwsem(&ei->i_data_sem);
ea3d7209 1143 init_rwsem(&ei->i_mmap_sem);
a35afb83 1144 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1145}
1146
e67bc2b3 1147static int __init init_inodecache(void)
ac27a0ec 1148{
f8dd7c70
DW		 1149 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1150 sizeof(struct ext4_inode_info), 0,
1151 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1152 SLAB_ACCOUNT),
1153 offsetof(struct ext4_inode_info, i_data),
1154 sizeof_field(struct ext4_inode_info, i_data),
1155 init_once);
617ba13b 1156 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1157 return -ENOMEM;
1158 return 0;
1159}
1160
1161static void destroy_inodecache(void)
1162{
8c0a8537
KS		 1163 /*
1164 * Make sure all delayed rcu free inodes are flushed before we
1165 * destroy cache.
1166 */
1167 rcu_barrier();
617ba13b 1168 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1169}
1170
0930fcc1 1171void ext4_clear_inode(struct inode *inode)
ac27a0ec 1172{
0930fcc1 1173 invalidate_inode_buffers(inode);
dbd5768f 1174 clear_inode(inode);
9f754758 1175 dquot_drop(inode);
c2ea3fde 1176 ext4_discard_preallocations(inode);
51865fda 1177 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1178 if (EXT4_I(inode)->jinode) {
1179 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1180 EXT4_I(inode)->jinode);
1181 jbd2_free_inode(EXT4_I(inode)->jinode);
1182 EXT4_I(inode)->jinode = NULL;
1183 }
3d204e24 1184 fscrypt_put_encryption_info(inode);
c93d8f88 1185 fsverity_cleanup_inode(inode);
ac27a0ec
DK		 1186}
1187
1b961ac0 1188static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1189 u64 ino, u32 generation)
ac27a0ec 1190{
ac27a0ec 1191 struct inode *inode;
ac27a0ec 1192
8a363970 1193 /*
ac27a0ec
DK		 1194 * Currently we don't know the generation for parent directory, so
1195 * a generation of 0 means "accept any"
1196 */
8a363970 1197 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1198 if (IS_ERR(inode))
1199 return ERR_CAST(inode);
1200 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1201 iput(inode);
1202 return ERR_PTR(-ESTALE);
1203 }
1b961ac0
CH		 1204
1205 return inode;
1206}
1207
1208static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1209 int fh_len, int fh_type)
1b961ac0
CH		 1210{
1211 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1212 ext4_nfs_get_inode);
1213}
1214
1215static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1216 int fh_len, int fh_type)
1b961ac0
CH		 1217{
1218 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1219 ext4_nfs_get_inode);
ac27a0ec
DK		 1220}
1221
fde87268
TT		 1222static int ext4_nfs_commit_metadata(struct inode *inode)
1223{
1224 struct writeback_control wbc = {
1225 .sync_mode = WB_SYNC_ALL
1226 };
1227
1228 trace_ext4_nfs_commit_metadata(inode);
1229 return ext4_write_inode(inode, &wbc);
1230}
1231
c39a7f84
TO		 1232/*
1233 * Try to release metadata pages (indirect blocks, directories) which are
1234 * mapped via the block device. Since these pages could have journal heads
1235 * which would prevent try_to_free_buffers() from freeing them, we must use
1236 * jbd2 layer's try_to_free_buffers() function to release them.
1237 */
0b8e58a1
AD		 1238static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1239 gfp_t wait)
c39a7f84
TO		 1240{
1241 journal_t *journal = EXT4_SB(sb)->s_journal;
1242
1243 WARN_ON(PageChecked(page));
1244 if (!page_has_buffers(page))
1245 return 0;
1246 if (journal)
1247 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1248 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1249 return try_to_free_buffers(page);
1250}
1251
643fa961 1252#ifdef CONFIG_FS_ENCRYPTION
a7550b30
JK		 1253static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1254{
1255 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1256 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1257}
1258
a7550b30
JK		 1259static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1260 void *fs_data)
1261{
2f8f5e76 1262 handle_t *handle = fs_data;
c1a5d5f6 1263 int res, res2, credits, retries = 0;
2f8f5e76 1264
9ce0151a
EB		 1265 /*
1266 * Encrypting the root directory is not allowed because e2fsck expects
1267 * lost+found to exist and be unencrypted, and encrypting the root
1268 * directory would imply encrypting the lost+found directory as well as
1269 * the filename "lost+found" itself.
1270 */
1271 if (inode->i_ino == EXT4_ROOT_INO)
1272 return -EPERM;
2f8f5e76 1273
7d3e06a8
RZ		 1274 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1275 return -EINVAL;
1276
94840e3c
EB		 1277 res = ext4_convert_inline_data(inode);
1278 if (res)
1279 return res;
1280
2f8f5e76
EB		 1281 /*
1282 * If a journal handle was specified, then the encryption context is
1283 * being set on a new inode via inheritance and is part of a larger
1284 * transaction to create the inode. Otherwise the encryption context is
1285 * being set on an existing inode in its own transaction. Only in the
1286 * latter case should the "retry on ENOSPC" logic be used.
1287 */
a7550b30 1288
2f8f5e76
EB		 1289 if (handle) {
1290 res = ext4_xattr_set_handle(handle, inode,
1291 EXT4_XATTR_INDEX_ENCRYPTION,
1292 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1293 ctx, len, 0);
a7550b30
JK		 1294 if (!res) {
1295 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1296 ext4_clear_inode_state(inode,
1297 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1298 /*
2ee6a576
EB		 1299 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1300 * S_DAX may be disabled
a3caa24b
JK		 1301 */
1302 ext4_set_inode_flags(inode);
a7550b30
JK		 1303 }
1304 return res;
1305 }
1306
b8cb5a54
TE		 1307 res = dquot_initialize(inode);
1308 if (res)
1309 return res;
2f8f5e76 1310retry:
af65207c
TE		 1311 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1312 &credits);
dec214d0
TE		 1313 if (res)
1314 return res;
1315
c1a5d5f6 1316 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1317 if (IS_ERR(handle))
1318 return PTR_ERR(handle);
1319
2f8f5e76
EB		 1320 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1321 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1322 ctx, len, 0);
a7550b30
JK		 1323 if (!res) {
1324 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1325 /*
1326 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1327 * S_DAX may be disabled
1328 */
a3caa24b 1329 ext4_set_inode_flags(inode);
a7550b30
JK		 1330 res = ext4_mark_inode_dirty(handle, inode);
1331 if (res)
1332 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1333 }
1334 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1335
1336 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1337 goto retry;
a7550b30
JK		 1338 if (!res)
1339 res = res2;
1340 return res;
1341}
1342
c250b7dd 1343static bool ext4_dummy_context(struct inode *inode)
a7550b30
JK		 1344{
1345 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1346}
1347
6f69f0ed 1348static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1349 .key_prefix = "ext4:",
a7550b30 1350 .get_context = ext4_get_context,
a7550b30
JK		 1351 .set_context = ext4_set_context,
1352 .dummy_context = ext4_dummy_context,
a7550b30 1353 .empty_dir = ext4_empty_dir,
e12ee683 1354 .max_namelen = EXT4_NAME_LEN,
a7550b30 1355};
a7550b30
JK		 1356#endif
1357
ac27a0ec 1358#ifdef CONFIG_QUOTA
d6006186 1359static const char * const quotatypes[] = INITQFNAMES;
689c958c 1360#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1361
617ba13b
MC		 1362static int ext4_write_dquot(struct dquot *dquot);
1363static int ext4_acquire_dquot(struct dquot *dquot);
1364static int ext4_release_dquot(struct dquot *dquot);
1365static int ext4_mark_dquot_dirty(struct dquot *dquot);
1366static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1367static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1368 const struct path *path);
617ba13b
MC		 1369static int ext4_quota_on_mount(struct super_block *sb, int type);
1370static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1371 size_t len, loff_t off);
617ba13b 1372static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1373 const char *data, size_t len, loff_t off);
7c319d32
AK		 1374static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1375 unsigned int flags);
1376static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1377static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1378
96c7e0d9
JK		 1379static struct dquot **ext4_get_dquots(struct inode *inode)
1380{
1381 return EXT4_I(inode)->i_dquot;
1382}
1383
61e225dc 1384static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1385 .get_reserved_space = ext4_get_reserved_space,
1386 .write_dquot = ext4_write_dquot,
1387 .acquire_dquot = ext4_acquire_dquot,
1388 .release_dquot = ext4_release_dquot,
1389 .mark_dirty = ext4_mark_dquot_dirty,
1390 .write_info = ext4_write_info,
1391 .alloc_dquot = dquot_alloc,
1392 .destroy_dquot = dquot_destroy,
1393 .get_projid = ext4_get_projid,
1394 .get_inode_usage = ext4_get_inode_usage,
1395 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1396};
1397
0d54b217 1398static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1399 .quota_on = ext4_quota_on,
ca0e05e4 1400 .quota_off = ext4_quota_off,
287a8095 1401 .quota_sync = dquot_quota_sync,
0a240339 1402 .get_state = dquot_get_state,
287a8095
CH		 1403 .set_info = dquot_set_dqinfo,
1404 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1405 .set_dqblk = dquot_set_dqblk,
1406 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1407};
1408#endif
1409
ee9b6d61 1410static const struct super_operations ext4_sops = {
617ba13b 1411 .alloc_inode = ext4_alloc_inode,
94053139 1412 .free_inode = ext4_free_in_core_inode,
617ba13b 1413 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1414 .write_inode = ext4_write_inode,
1415 .dirty_inode = ext4_dirty_inode,
7ff9c073 1416 .drop_inode = ext4_drop_inode,
0930fcc1 1417 .evict_inode = ext4_evict_inode,
617ba13b 1418 .put_super = ext4_put_super,
617ba13b 1419 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1420 .freeze_fs = ext4_freeze,
1421 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1422 .statfs = ext4_statfs,
1423 .remount_fs = ext4_remount,
617ba13b 1424 .show_options = ext4_show_options,
ac27a0ec 1425#ifdef CONFIG_QUOTA
617ba13b
MC		 1426 .quota_read = ext4_quota_read,
1427 .quota_write = ext4_quota_write,
96c7e0d9 1428 .get_dquots = ext4_get_dquots,
ac27a0ec 1429#endif
c39a7f84 1430 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1431};
1432
39655164 1433static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1434 .fh_to_dentry = ext4_fh_to_dentry,
1435 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1436 .get_parent = ext4_get_parent,
fde87268 1437 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1438};
1439
1440enum {
1441 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1442 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1443 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1444 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1445 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1446 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1447 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1448 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1449 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1450 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1451 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1452 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1453 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
327eaf73
TT		 1454 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1455 Opt_nowarn_on_error, Opt_mblk_io_submit,
670e9875 1456 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1457 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1458 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1459 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1460 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1461 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
ac27a0ec
DK		 1462};
1463
a447c093 1464static const match_table_t tokens = {
ac27a0ec
DK		 1465 {Opt_bsd_df, "bsddf"},
1466 {Opt_minix_df, "minixdf"},
1467 {Opt_grpid, "grpid"},
1468 {Opt_grpid, "bsdgroups"},
1469 {Opt_nogrpid, "nogrpid"},
1470 {Opt_nogrpid, "sysvgroups"},
1471 {Opt_resgid, "resgid=%u"},
1472 {Opt_resuid, "resuid=%u"},
1473 {Opt_sb, "sb=%u"},
1474 {Opt_err_cont, "errors=continue"},
1475 {Opt_err_panic, "errors=panic"},
1476 {Opt_err_ro, "errors=remount-ro"},
1477 {Opt_nouid32, "nouid32"},
ac27a0ec 1478 {Opt_debug, "debug"},
72578c33
TT		 1479 {Opt_removed, "oldalloc"},
1480 {Opt_removed, "orlov"},
ac27a0ec
DK		 1481 {Opt_user_xattr, "user_xattr"},
1482 {Opt_nouser_xattr, "nouser_xattr"},
1483 {Opt_acl, "acl"},
1484 {Opt_noacl, "noacl"},
e3bb52ae 1485 {Opt_noload, "norecovery"},
5a916be1 1486 {Opt_noload, "noload"},
72578c33
TT		 1487 {Opt_removed, "nobh"},
1488 {Opt_removed, "bh"},
ac27a0ec 1489 {Opt_commit, "commit=%u"},
30773840
TT		 1490 {Opt_min_batch_time, "min_batch_time=%u"},
1491 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1492 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1493 {Opt_journal_path, "journal_path=%s"},
818d276c 1494 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1495 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1496 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1497 {Opt_abort, "abort"},
1498 {Opt_data_journal, "data=journal"},
1499 {Opt_data_ordered, "data=ordered"},
1500 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1501 {Opt_data_err_abort, "data_err=abort"},
1502 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1503 {Opt_offusrjquota, "usrjquota="},
1504 {Opt_usrjquota, "usrjquota=%s"},
1505 {Opt_offgrpjquota, "grpjquota="},
1506 {Opt_grpjquota, "grpjquota=%s"},
1507 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1508 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1509 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1510 {Opt_grpquota, "grpquota"},
1511 {Opt_noquota, "noquota"},
1512 {Opt_quota, "quota"},
1513 {Opt_usrquota, "usrquota"},
49da9392 1514 {Opt_prjquota, "prjquota"},
ac27a0ec 1515 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1516 {Opt_barrier, "barrier"},
1517 {Opt_nobarrier, "nobarrier"},
25ec56b5 1518 {Opt_i_version, "i_version"},
923ae0ff 1519 {Opt_dax, "dax"},
c9de560d 1520 {Opt_stripe, "stripe=%u"},
64769240 1521 {Opt_delalloc, "delalloc"},
327eaf73
TT		 1522 {Opt_warn_on_error, "warn_on_error"},
1523 {Opt_nowarn_on_error, "nowarn_on_error"},
a26f4992
TT		 1524 {Opt_lazytime, "lazytime"},
1525 {Opt_nolazytime, "nolazytime"},
670e9875 1526 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1527 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1528 {Opt_removed, "mblk_io_submit"},
1529 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1530 {Opt_block_validity, "block_validity"},
1531 {Opt_noblock_validity, "noblock_validity"},
240799cd 1532 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1533 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1534 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1535 {Opt_auto_da_alloc, "auto_da_alloc"},
1536 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1537 {Opt_dioread_nolock, "dioread_nolock"},
1538 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1539 {Opt_discard, "discard"},
1540 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1541 {Opt_init_itable, "init_itable=%u"},
1542 {Opt_init_itable, "init_itable"},
1543 {Opt_noinit_itable, "noinit_itable"},
df981d03 1544 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1545 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1546 {Opt_nombcache, "nombcache"},
1547 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
c7198b9c
TT		 1548 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1549 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1550 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1551 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1552 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1553 {Opt_err, NULL},
ac27a0ec
DK		 1554};
1555
617ba13b 1556static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1557{
617ba13b 1558 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1559 char *options = (char *) *data;
1560
1561 if (!options || strncmp(options, "sb=", 3) != 0)
1562 return 1; /* Default location */
0b8e58a1 1563
ac27a0ec 1564 options += 3;
0b8e58a1 1565 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1566 sb_block = simple_strtoul(options, &options, 0);
1567 if (*options && *options != ',') {
4776004f 1568 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1569 (char *) *data);
1570 return 1;
1571 }
1572 if (*options == ',')
1573 options++;
1574 *data = (void *) options;
0b8e58a1 1575
ac27a0ec
DK		 1576 return sb_block;
1577}
1578
b3881f74 1579#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1580static const char deprecated_msg[] =
1581 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1582 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1583
56c50f11
DM		 1584#ifdef CONFIG_QUOTA
1585static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1586{
1587 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1588 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
03dafb5f 1589 int ret = -1;
56c50f11 1590
33458eab 1591 if (sb_any_quota_loaded(sb) && !old_qname) {
56c50f11
DM		 1592 ext4_msg(sb, KERN_ERR,
1593 "Cannot change journaled "
1594 "quota options when quota turned on");
57f73c2c 1595 return -1;
56c50f11 1596 }
e2b911c5 1597 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1598 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1599 "ignored when QUOTA feature is enabled");
1600 return 1;
262b4662 1601 }
56c50f11
DM		 1602 qname = match_strdup(args);
1603 if (!qname) {
1604 ext4_msg(sb, KERN_ERR,
1605 "Not enough memory for storing quotafile name");
57f73c2c 1606 return -1;
56c50f11 1607 }
33458eab
TT		 1608 if (old_qname) {
1609 if (strcmp(old_qname, qname) == 0)
03dafb5f
CG		 1610 ret = 1;
1611 else
1612 ext4_msg(sb, KERN_ERR,
1613 "%s quota file already specified",
1614 QTYPE2NAME(qtype));
1615 goto errout;
56c50f11 1616 }
03dafb5f 1617 if (strchr(qname, '/')) {
56c50f11
DM		 1618 ext4_msg(sb, KERN_ERR,
1619 "quotafile must be on filesystem root");
03dafb5f 1620 goto errout;
56c50f11 1621 }
33458eab 1622 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
fd8c37ec 1623 set_opt(sb, QUOTA);
56c50f11 1624 return 1;
03dafb5f
CG		 1625errout:
1626 kfree(qname);
1627 return ret;
56c50f11
DM		 1628}
1629
1630static int clear_qf_name(struct super_block *sb, int qtype)
1631{
1632
1633 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1634 char *old_qname = get_qf_name(sb, sbi, qtype);
56c50f11 1635
33458eab 1636 if (sb_any_quota_loaded(sb) && old_qname) {
56c50f11
DM		 1637 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1638 " when quota turned on");
57f73c2c 1639 return -1;
56c50f11 1640 }
33458eab
TT		 1641 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1642 synchronize_rcu();
1643 kfree(old_qname);
56c50f11
DM		 1644 return 1;
1645}
1646#endif
1647
26092bf5
TT		 1648#define MOPT_SET 0x0001
1649#define MOPT_CLEAR 0x0002
1650#define MOPT_NOSUPPORT 0x0004
1651#define MOPT_EXPLICIT 0x0008
1652#define MOPT_CLEAR_ERR 0x0010
1653#define MOPT_GTE0 0x0020
ac27a0ec 1654#ifdef CONFIG_QUOTA
26092bf5
TT		 1655#define MOPT_Q 0
1656#define MOPT_QFMT 0x0040
1657#else
1658#define MOPT_Q MOPT_NOSUPPORT
1659#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1660#endif
26092bf5 1661#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1662#define MOPT_NO_EXT2 0x0100
1663#define MOPT_NO_EXT3 0x0200
1664#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1665#define MOPT_STRING 0x0400
26092bf5
TT		 1666
1667static const struct mount_opts {
1668 int token;
1669 int mount_opt;
1670 int flags;
1671} ext4_mount_opts[] = {
1672 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1673 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1674 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1675 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1676 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1677 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1678 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1679 MOPT_EXT4_ONLY | MOPT_SET},
1680 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1681 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1682 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1683 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1684 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1685 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1686 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1687 MOPT_EXT4_ONLY | MOPT_CLEAR},
327eaf73
TT		 1688 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1689 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
c6d3d56d
DW		 1690 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1691 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1692 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1693 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1694 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1695 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1696 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1697 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1698 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1699 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1700 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1701 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1702 MOPT_NO_EXT2},
8dc0aa8c 1703 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1704 MOPT_NO_EXT2},
26092bf5
TT		 1705 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1706 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1707 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1708 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1709 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1710 {Opt_commit, 0, MOPT_GTE0},
1711 {Opt_max_batch_time, 0, MOPT_GTE0},
1712 {Opt_min_batch_time, 0, MOPT_GTE0},
1713 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1714 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1715 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1716 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1717 {Opt_resuid, 0, MOPT_GTE0},
1718 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1719 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1720 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1721 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1722 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1723 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1724 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1725 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1726 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1727 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1728#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1729 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1730 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1731#else
26092bf5
TT		 1732 {Opt_acl, 0, MOPT_NOSUPPORT},
1733 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1734#endif
26092bf5
TT		 1735 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1736 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1737 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1738 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1739 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1740 MOPT_SET | MOPT_Q},
1741 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1742 MOPT_SET | MOPT_Q},
49da9392
JK		 1743 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1744 MOPT_SET | MOPT_Q},
26092bf5 1745 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1746 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1747 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1748 {Opt_usrjquota, 0, MOPT_Q},
1749 {Opt_grpjquota, 0, MOPT_Q},
1750 {Opt_offusrjquota, 0, MOPT_Q},
1751 {Opt_offgrpjquota, 0, MOPT_Q},
1752 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1753 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1754 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1755 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1756 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
cdb7ee4c 1757 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
26092bf5
TT		 1758 {Opt_err, 0, 0}
1759};
1760
c83ad55e
GKB		 1761#ifdef CONFIG_UNICODE
1762static const struct ext4_sb_encodings {
1763 __u16 magic;
1764 char *name;
1765 char *version;
1766} ext4_sb_encoding_map[] = {
1767 {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1768};
1769
1770static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1771 const struct ext4_sb_encodings **encoding,
1772 __u16 *flags)
1773{
1774 __u16 magic = le16_to_cpu(es->s_encoding);
1775 int i;
1776
1777 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1778 if (magic == ext4_sb_encoding_map[i].magic)
1779 break;
1780
1781 if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1782 return -EINVAL;
1783
1784 *encoding = &ext4_sb_encoding_map[i];
1785 *flags = le16_to_cpu(es->s_encoding_flags);
1786
1787 return 0;
1788}
1789#endif
1790
26092bf5
TT		 1791static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1792 substring_t *args, unsigned long *journal_devnum,
1793 unsigned int *journal_ioprio, int is_remount)
1794{
1795 struct ext4_sb_info *sbi = EXT4_SB(sb);
1796 const struct mount_opts *m;
08cefc7a
EB		 1797 kuid_t uid;
1798 kgid_t gid;
26092bf5
TT		 1799 int arg = 0;
1800
57f73c2c
TT		 1801#ifdef CONFIG_QUOTA
1802 if (token == Opt_usrjquota)
1803 return set_qf_name(sb, USRQUOTA, &args[0]);
1804 else if (token == Opt_grpjquota)
1805 return set_qf_name(sb, GRPQUOTA, &args[0]);
1806 else if (token == Opt_offusrjquota)
1807 return clear_qf_name(sb, USRQUOTA);
1808 else if (token == Opt_offgrpjquota)
1809 return clear_qf_name(sb, GRPQUOTA);
1810#endif
26092bf5 1811 switch (token) {
f7048605
TT		 1812 case Opt_noacl:
1813 case Opt_nouser_xattr:
1814 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1815 break;
26092bf5
TT		 1816 case Opt_sb:
1817 return 1; /* handled by get_sb_block() */
1818 case Opt_removed:
5f3633e3 1819 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1820 return 1;
26092bf5
TT		 1821 case Opt_abort:
1822 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1823 return 1;
1824 case Opt_i_version:
357fdad0 1825 sb->s_flags |= SB_I_VERSION;
26092bf5 1826 return 1;
a26f4992 1827 case Opt_lazytime:
1751e8a6 1828 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1829 return 1;
1830 case Opt_nolazytime:
1751e8a6 1831 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1832 return 1;
26092bf5
TT		 1833 }
1834
5f3633e3
JK		 1835 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1836 if (token == m->token)
1837 break;
1838
1839 if (m->token == Opt_err) {
1840 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1841 "or missing value", opt);
1842 return -1;
1843 }
1844
8dc0aa8c
TT		 1845 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1846 ext4_msg(sb, KERN_ERR,
1847 "Mount option \"%s\" incompatible with ext2", opt);
1848 return -1;
1849 }
1850 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1851 ext4_msg(sb, KERN_ERR,
1852 "Mount option \"%s\" incompatible with ext3", opt);
1853 return -1;
1854 }
1855
ad4eec61 1856 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1857 return -1;
1858 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1859 return -1;
c93cf2d7
DM		 1860 if (m->flags & MOPT_EXPLICIT) {
1861 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1862 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1863 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1864 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1865 } else
1866 return -1;
1867 }
5f3633e3
JK		 1868 if (m->flags & MOPT_CLEAR_ERR)
1869 clear_opt(sb, ERRORS_MASK);
1870 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1871 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1872 "options when quota turned on");
1873 return -1;
1874 }
1875
1876 if (m->flags & MOPT_NOSUPPORT) {
1877 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1878 } else if (token == Opt_commit) {
1879 if (arg == 0)
1880 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
9ba55543 1881 else if (arg > INT_MAX / HZ) {
1882 ext4_msg(sb, KERN_ERR,
1883 "Invalid commit interval %d, "
1884 "must be smaller than %d",
1885 arg, INT_MAX / HZ);
1886 return -1;
1887 }
5f3633e3 1888 sbi->s_commit_interval = HZ * arg;
670e9875
TT		 1889 } else if (token == Opt_debug_want_extra_isize) {
1890 sbi->s_want_extra_isize = arg;
5f3633e3 1891 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1892 sbi->s_max_batch_time = arg;
1893 } else if (token == Opt_min_batch_time) {
1894 sbi->s_min_batch_time = arg;
1895 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1896 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1897 ext4_msg(sb, KERN_ERR,
1898 "EXT4-fs: inode_readahead_blks must be "
1899 "0 or a power of 2 smaller than 2^31");
26092bf5 1900 return -1;
5f3633e3
JK		 1901 }
1902 sbi->s_inode_readahead_blks = arg;
1903 } else if (token == Opt_init_itable) {
1904 set_opt(sb, INIT_INODE_TABLE);
1905 if (!args->from)
1906 arg = EXT4_DEF_LI_WAIT_MULT;
1907 sbi->s_li_wait_mult = arg;
1908 } else if (token == Opt_max_dir_size_kb) {
1909 sbi->s_max_dir_size_kb = arg;
1910 } else if (token == Opt_stripe) {
1911 sbi->s_stripe = arg;
1912 } else if (token == Opt_resuid) {
1913 uid = make_kuid(current_user_ns(), arg);
1914 if (!uid_valid(uid)) {
1915 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1916 return -1;
1917 }
5f3633e3
JK		 1918 sbi->s_resuid = uid;
1919 } else if (token == Opt_resgid) {
1920 gid = make_kgid(current_user_ns(), arg);
1921 if (!gid_valid(gid)) {
1922 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1923 return -1;
1924 }
1925 sbi->s_resgid = gid;
1926 } else if (token == Opt_journal_dev) {
1927 if (is_remount) {
1928 ext4_msg(sb, KERN_ERR,
1929 "Cannot specify journal on remount");
1930 return -1;
1931 }
1932 *journal_devnum = arg;
ad4eec61
ES		 1933 } else if (token == Opt_journal_path) {
1934 char *journal_path;
1935 struct inode *journal_inode;
1936 struct path path;
1937 int error;
1938
1939 if (is_remount) {
1940 ext4_msg(sb, KERN_ERR,
1941 "Cannot specify journal on remount");
1942 return -1;
1943 }
1944 journal_path = match_strdup(&args[0]);
1945 if (!journal_path) {
1946 ext4_msg(sb, KERN_ERR, "error: could not dup "
1947 "journal device string");
1948 return -1;
1949 }
1950
1951 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1952 if (error) {
1953 ext4_msg(sb, KERN_ERR, "error: could not find "
1954 "journal device path: error %d", error);
1955 kfree(journal_path);
1956 return -1;
1957 }
1958
2b0143b5 1959 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1960 if (!S_ISBLK(journal_inode->i_mode)) {
1961 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1962 "is not a block device", journal_path);
1963 path_put(&path);
1964 kfree(journal_path);
1965 return -1;
1966 }
1967
1968 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1969 path_put(&path);
1970 kfree(journal_path);
5f3633e3
JK		 1971 } else if (token == Opt_journal_ioprio) {
1972 if (arg > 7) {
1973 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1974 " (must be 0-7)");
1975 return -1;
1976 }
1977 *journal_ioprio =
1978 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447 1979 } else if (token == Opt_test_dummy_encryption) {
643fa961 1980#ifdef CONFIG_FS_ENCRYPTION
6ddb2447
TT		 1981 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1982 ext4_msg(sb, KERN_WARNING,
1983 "Test dummy encryption mode enabled");
1984#else
1985 ext4_msg(sb, KERN_WARNING,
1986 "Test dummy encryption mount option ignored");
1987#endif
5f3633e3
JK		 1988 } else if (m->flags & MOPT_DATAJ) {
1989 if (is_remount) {
1990 if (!sbi->s_journal)
1991 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1992 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1993 ext4_msg(sb, KERN_ERR,
26092bf5 1994 "Cannot change data mode on remount");
26092bf5 1995 return -1;
ac27a0ec 1996 }
26092bf5 1997 } else {
5f3633e3
JK		 1998 clear_opt(sb, DATA_FLAGS);
1999 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 2000 }
5f3633e3
JK		 2001#ifdef CONFIG_QUOTA
2002 } else if (m->flags & MOPT_QFMT) {
2003 if (sb_any_quota_loaded(sb) &&
2004 sbi->s_jquota_fmt != m->mount_opt) {
2005 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2006 "quota options when quota turned on");
2007 return -1;
2008 }
e2b911c5 2009 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 2010 ext4_msg(sb, KERN_INFO,
2011 "Quota format mount options ignored "
262b4662 2012 "when QUOTA feature is enabled");
c325a67c 2013 return 1;
262b4662 2014 }
5f3633e3 2015 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 2016#endif
923ae0ff 2017 } else if (token == Opt_dax) {
ef83b6e8
DW		 2018#ifdef CONFIG_FS_DAX
2019 ext4_msg(sb, KERN_WARNING,
2020 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
a92abd73 2021 sbi->s_mount_opt |= m->mount_opt;
ef83b6e8 2022#else
923ae0ff
RZ		 2023 ext4_msg(sb, KERN_INFO, "dax option not supported");
2024 return -1;
5f3633e3 2025#endif
7915a861
AN		 2026 } else if (token == Opt_data_err_abort) {
2027 sbi->s_mount_opt |= m->mount_opt;
2028 } else if (token == Opt_data_err_ignore) {
2029 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 2030 } else {
2031 if (!args->from)
2032 arg = 1;
2033 if (m->flags & MOPT_CLEAR)
2034 arg = !arg;
2035 else if (unlikely(!(m->flags & MOPT_SET))) {
2036 ext4_msg(sb, KERN_WARNING,
2037 "buggy handling of option %s", opt);
2038 WARN_ON(1);
2039 return -1;
2040 }
2041 if (arg != 0)
2042 sbi->s_mount_opt |= m->mount_opt;
2043 else
2044 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 2045 }
5f3633e3 2046 return 1;
26092bf5
TT		 2047}
2048
2049static int parse_options(char *options, struct super_block *sb,
2050 unsigned long *journal_devnum,
2051 unsigned int *journal_ioprio,
2052 int is_remount)
2053{
2054 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2055 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
26092bf5
TT		 2056 substring_t args[MAX_OPT_ARGS];
2057 int token;
2058
2059 if (!options)
2060 return 1;
2061
2062 while ((p = strsep(&options, ",")) != NULL) {
2063 if (!*p)
2064 continue;
2065 /*
2066 * Initialize args struct so we know whether arg was
2067 * found; some options take optional arguments.
2068 */
caecd0af 2069 args[0].to = args[0].from = NULL;
26092bf5
TT		 2070 token = match_token(p, tokens, args);
2071 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2072 journal_ioprio, is_remount) < 0)
2073 return 0;
ac27a0ec
DK		 2074 }
2075#ifdef CONFIG_QUOTA
49da9392
JK		 2076 /*
2077 * We do the test below only for project quotas. 'usrquota' and
2078 * 'grpquota' mount options are allowed even without quota feature
2079 * to support legacy quotas in quota files.
2080 */
2081 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2082 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2083 "Cannot enable project quota enforcement.");
2084 return 0;
2085 }
33458eab
TT		 2086 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2087 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2088 if (usr_qf_name || grp_qf_name) {
2089 if (test_opt(sb, USRQUOTA) && usr_qf_name)
fd8c37ec 2090 clear_opt(sb, USRQUOTA);
ac27a0ec 2091
33458eab 2092 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
fd8c37ec 2093 clear_opt(sb, GRPQUOTA);
ac27a0ec 2094
56c50f11 2095 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 2096 ext4_msg(sb, KERN_ERR, "old and new quota "
2097 "format mixing");
ac27a0ec
DK		 2098 return 0;
2099 }
2100
2101 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 2102 ext4_msg(sb, KERN_ERR, "journaled quota format "
2103 "not specified");
ac27a0ec
DK		 2104 return 0;
2105 }
ac27a0ec
DK		 2106 }
2107#endif
261cb20c
JK		 2108 if (test_opt(sb, DIOREAD_NOLOCK)) {
2109 int blocksize =
2110 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2111
09cbfeaf 2112 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 2113 ext4_msg(sb, KERN_ERR, "can't mount with "
2114 "dioread_nolock if block size != PAGE_SIZE");
2115 return 0;
2116 }
2117 }
ac27a0ec
DK		 2118 return 1;
2119}
2120
2adf6da8
TT		 2121static inline void ext4_show_quota_options(struct seq_file *seq,
2122 struct super_block *sb)
2123{
2124#if defined(CONFIG_QUOTA)
2125 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2126 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2127
2128 if (sbi->s_jquota_fmt) {
2129 char *fmtname = "";
2130
2131 switch (sbi->s_jquota_fmt) {
2132 case QFMT_VFS_OLD:
2133 fmtname = "vfsold";
2134 break;
2135 case QFMT_VFS_V0:
2136 fmtname = "vfsv0";
2137 break;
2138 case QFMT_VFS_V1:
2139 fmtname = "vfsv1";
2140 break;
2141 }
2142 seq_printf(seq, ",jqfmt=%s", fmtname);
2143 }
2144
33458eab
TT		 2145 rcu_read_lock();
2146 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2147 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2148 if (usr_qf_name)
2149 seq_show_option(seq, "usrjquota", usr_qf_name);
2150 if (grp_qf_name)
2151 seq_show_option(seq, "grpjquota", grp_qf_name);
2152 rcu_read_unlock();
2adf6da8
TT		 2153#endif
2154}
2155
5a916be1
TT		 2156static const char *token2str(int token)
2157{
50df9fd5 2158 const struct match_token *t;
5a916be1
TT		 2159
2160 for (t = tokens; t->token != Opt_err; t++)
2161 if (t->token == token && !strchr(t->pattern, '='))
2162 break;
2163 return t->pattern;
2164}
2165
2adf6da8
TT		 2166/*
2167 * Show an option if
2168 * - it's set to a non-default value OR
2169 * - if the per-sb default is different from the global default
2170 */
66acdcf4
TT		 2171static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2172 int nodefs)
2adf6da8 2173{
2adf6da8
TT		 2174 struct ext4_sb_info *sbi = EXT4_SB(sb);
2175 struct ext4_super_block *es = sbi->s_es;
68afa7e0 2176 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
5a916be1 2177 const struct mount_opts *m;
66acdcf4 2178 char sep = nodefs ? '\n' : ',';
2adf6da8 2179
66acdcf4
TT		 2180#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2181#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2182
2183 if (sbi->s_sb_block != 1)
5a916be1
TT		 2184 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2185
2186 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2187 int want_set = m->flags & MOPT_SET;
2188 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2189 (m->flags & MOPT_CLEAR_ERR))
2190 continue;
68afa7e0 2191 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2192 continue; /* skip if same as the default */
2193 if ((want_set &&
2194 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2195 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2196 continue; /* select Opt_noFoo vs Opt_Foo */
2197 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2198 }
5a916be1 2199
08cefc7a 2200 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2201 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2202 SEQ_OPTS_PRINT("resuid=%u",
2203 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2204 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2205 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2206 SEQ_OPTS_PRINT("resgid=%u",
2207 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2208 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2209 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2210 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2211 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2212 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2213 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2214 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2215 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2216 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2217 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2218 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2219 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2220 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2221 if (sb->s_flags & SB_I_VERSION)
5a916be1 2222 SEQ_OPTS_PUTS("i_version");
66acdcf4 2223 if (nodefs || sbi->s_stripe)
5a916be1 2224 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0
TN		 2225 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2226 (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2227 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2228 SEQ_OPTS_PUTS("data=journal");
2229 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2230 SEQ_OPTS_PUTS("data=ordered");
2231 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2232 SEQ_OPTS_PUTS("data=writeback");
2233 }
66acdcf4
TT		 2234 if (nodefs ||
2235 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2236 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2237 sbi->s_inode_readahead_blks);
2adf6da8 2238
ceec0376 2239 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 2240 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2241 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2242 if (nodefs || sbi->s_max_dir_size_kb)
2243 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2244 if (test_opt(sb, DATA_ERR_ABORT))
2245 SEQ_OPTS_PUTS("data_err=abort");
338affb5
EB		 2246 if (DUMMY_ENCRYPTION_ENABLED(sbi))
2247 SEQ_OPTS_PUTS("test_dummy_encryption");
2adf6da8
TT		 2248
2249 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2250 return 0;
2251}
2252
66acdcf4
TT		 2253static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2254{
2255 return _ext4_show_options(seq, root->d_sb, 0);
2256}
2257
ebd173be 2258int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2259{
2260 struct super_block *sb = seq->private;
2261 int rc;
2262
bc98a42c 2263 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2264 rc = _ext4_show_options(seq, sb, 1);
2265 seq_puts(seq, "\n");
2266 return rc;
2267}
2268
617ba13b 2269static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2270 int read_only)
2271{
617ba13b 2272 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 2273 int err = 0;
ac27a0ec 2274
617ba13b 2275 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2276 ext4_msg(sb, KERN_ERR, "revision level too high, "
2277 "forcing read-only mode");
c89128a0 2278 err = -EROFS;
ac27a0ec
DK		 2279 }
2280 if (read_only)
281b5995 2281 goto done;
617ba13b 2282 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2283 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2284 "running e2fsck is recommended");
c8b459f4 2285 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2286 ext4_msg(sb, KERN_WARNING,
2287 "warning: mounting fs with errors, "
2288 "running e2fsck is recommended");
ed3ce80a 2289 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2290 le16_to_cpu(es->s_mnt_count) >=
2291 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2292 ext4_msg(sb, KERN_WARNING,
2293 "warning: maximal mount count reached, "
2294 "running e2fsck is recommended");
ac27a0ec 2295 else if (le32_to_cpu(es->s_checkinterval) &&
6a0678a7
AB		 2296 (ext4_get_tstamp(es, s_lastcheck) +
2297 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
b31e1552
ES		 2298 ext4_msg(sb, KERN_WARNING,
2299 "warning: checktime reached, "
2300 "running e2fsck is recommended");
0b8e58a1 2301 if (!sbi->s_journal)
0390131b 2302 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2303 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2304 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2305 le16_add_cpu(&es->s_mnt_count, 1);
6a0678a7 2306 ext4_update_tstamp(es, s_mtime);
0390131b 2307 if (sbi->s_journal)
e2b911c5 2308 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2309
c89128a0 2310 err = ext4_commit_super(sb, 1);
281b5995 2311done:
ac27a0ec 2312 if (test_opt(sb, DEBUG))
a9df9a49 2313 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2314 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2315 sb->s_blocksize,
2316 sbi->s_groups_count,
617ba13b
MC		 2317 EXT4_BLOCKS_PER_GROUP(sb),
2318 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2319 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2320
7abc52c2 2321 cleancache_init_fs(sb);
c89128a0 2322 return err;
ac27a0ec
DK		 2323}
2324
117fff10
TT		 2325int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2326{
2327 struct ext4_sb_info *sbi = EXT4_SB(sb);
2328 struct flex_groups *new_groups;
2329 int size;
2330
2331 if (!sbi->s_log_groups_per_flex)
2332 return 0;
2333
2334 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2335 if (size <= sbi->s_flex_groups_allocated)
2336 return 0;
2337
2338 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
a7c3e901 2339 new_groups = kvzalloc(size, GFP_KERNEL);
117fff10
TT		 2340 if (!new_groups) {
2341 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2342 size / (int) sizeof(struct flex_groups));
2343 return -ENOMEM;
2344 }
2345
2346 if (sbi->s_flex_groups) {
2347 memcpy(new_groups, sbi->s_flex_groups,
2348 (sbi->s_flex_groups_allocated *
2349 sizeof(struct flex_groups)));
b93b41d4 2350 kvfree(sbi->s_flex_groups);
117fff10
TT		 2351 }
2352 sbi->s_flex_groups = new_groups;
2353 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2354 return 0;
2355}
2356
772cb7c8
JS		 2357static int ext4_fill_flex_info(struct super_block *sb)
2358{
2359 struct ext4_sb_info *sbi = EXT4_SB(sb);
2360 struct ext4_group_desc *gdp = NULL;
772cb7c8 2361 ext4_group_t flex_group;
117fff10 2362 int i, err;
772cb7c8 2363
503358ae 2364 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2365 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2366 sbi->s_log_groups_per_flex = 0;
2367 return 1;
2368 }
2369
117fff10
TT		 2370 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2371 if (err)
9933fc0a 2372 goto failed;
772cb7c8 2373
772cb7c8 2374 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2375 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2376
2377 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2378 atomic_add(ext4_free_inodes_count(sb, gdp),
2379 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2380 atomic64_add(ext4_free_group_clusters(sb, gdp),
2381 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2382 atomic_add(ext4_used_dirs_count(sb, gdp),
2383 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2384 }
2385
2386 return 1;
2387failed:
2388 return 0;
2389}
2390
e2b911c5 2391static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2392 struct ext4_group_desc *gdp)
717d50e4 2393{
b47820ed 2394 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2395 __u16 crc = 0;
feb0ab32 2396 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2397 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2398
9aa5d32b 2399 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2400 /* Use new metadata_csum algorithm */
feb0ab32 2401 __u32 csum32;
b47820ed 2402 __u16 dummy_csum = 0;
feb0ab32 2403
feb0ab32
DW		 2404 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2405 sizeof(le_group));
b47820ed
DJ		 2406 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2407 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2408 sizeof(dummy_csum));
2409 offset += sizeof(dummy_csum);
2410 if (offset < sbi->s_desc_size)
2411 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2412 sbi->s_desc_size - offset);
feb0ab32
DW		 2413
2414 crc = csum32 & 0xFFFF;
2415 goto out;
717d50e4
AD		 2416 }
2417
feb0ab32 2418 /* old crc16 code */
e2b911c5 2419 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2420 return 0;
2421
feb0ab32
DW		 2422 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2423 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2424 crc = crc16(crc, (__u8 *)gdp, offset);
2425 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2426 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2427 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2428 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2429 crc = crc16(crc, (__u8 *)gdp + offset,
2430 le16_to_cpu(sbi->s_es->s_desc_size) -
2431 offset);
2432
2433out:
717d50e4
AD		 2434 return cpu_to_le16(crc);
2435}
2436
feb0ab32 2437int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2438 struct ext4_group_desc *gdp)
2439{
feb0ab32 2440 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2441 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2442 return 0;
2443
2444 return 1;
2445}
2446
feb0ab32
DW		 2447void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2448 struct ext4_group_desc *gdp)
2449{
2450 if (!ext4_has_group_desc_csum(sb))
2451 return;
e2b911c5 2452 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2453}
2454
ac27a0ec 2455/* Called at mount-time, super-block is locked */
bfff6873 2456static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2457 ext4_fsblk_t sb_block,
bfff6873 2458 ext4_group_t *first_not_zeroed)
ac27a0ec 2459{
617ba13b
MC		 2460 struct ext4_sb_info *sbi = EXT4_SB(sb);
2461 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2462 ext4_fsblk_t last_block;
44de022c 2463 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 2464 ext4_fsblk_t block_bitmap;
2465 ext4_fsblk_t inode_bitmap;
2466 ext4_fsblk_t inode_table;
ce421581 2467 int flexbg_flag = 0;
bfff6873 2468 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2469
e2b911c5 2470 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2471 flexbg_flag = 1;
2472
af5bc92d 2473 ext4_debug("Checking group descriptors");
ac27a0ec 2474
197cd65a
AM		 2475 for (i = 0; i < sbi->s_groups_count; i++) {
2476 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2477
ce421581 2478 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2479 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2480 else
2481 last_block = first_block +
617ba13b 2482 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2483
bfff6873
LC		 2484 if ((grp == sbi->s_groups_count) &&
2485 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2486 grp = i;
2487
8fadc143 2488 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2489 if (block_bitmap == sb_block) {
2490 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2491 "Block bitmap for group %u overlaps "
2492 "superblock", i);
18db4b4e
TT		 2493 if (!sb_rdonly(sb))
2494 return 0;
829fa70d 2495 }
77260807
TT		 2496 if (block_bitmap >= sb_block + 1 &&
2497 block_bitmap <= last_bg_block) {
2498 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2499 "Block bitmap for group %u overlaps "
2500 "block group descriptors", i);
2501 if (!sb_rdonly(sb))
2502 return 0;
2503 }
2b2d6d01 2504 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2505 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2506 "Block bitmap for group %u not in group "
b31e1552 2507 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2508 return 0;
2509 }
8fadc143 2510 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2511 if (inode_bitmap == sb_block) {
2512 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2513 "Inode bitmap for group %u overlaps "
2514 "superblock", i);
18db4b4e
TT		 2515 if (!sb_rdonly(sb))
2516 return 0;
829fa70d 2517 }
77260807
TT		 2518 if (inode_bitmap >= sb_block + 1 &&
2519 inode_bitmap <= last_bg_block) {
2520 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2521 "Inode bitmap for group %u overlaps "
2522 "block group descriptors", i);
2523 if (!sb_rdonly(sb))
2524 return 0;
2525 }
2b2d6d01 2526 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2527 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2528 "Inode bitmap for group %u not in group "
b31e1552 2529 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2530 return 0;
2531 }
8fadc143 2532 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2533 if (inode_table == sb_block) {
2534 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2535 "Inode table for group %u overlaps "
2536 "superblock", i);
18db4b4e
TT		 2537 if (!sb_rdonly(sb))
2538 return 0;
829fa70d 2539 }
77260807
TT		 2540 if (inode_table >= sb_block + 1 &&
2541 inode_table <= last_bg_block) {
2542 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2543 "Inode table for group %u overlaps "
2544 "block group descriptors", i);
2545 if (!sb_rdonly(sb))
2546 return 0;
2547 }
bd81d8ee 2548 if (inode_table < first_block ||
2b2d6d01 2549 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2550 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2551 "Inode table for group %u not in group "
b31e1552 2552 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2553 return 0;
2554 }
955ce5f5 2555 ext4_lock_group(sb, i);
feb0ab32 2556 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2557 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2558 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2559 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2560 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2561 if (!sb_rdonly(sb)) {
955ce5f5 2562 ext4_unlock_group(sb, i);
8a266467 2563 return 0;
7ee1ec4c 2564 }
717d50e4 2565 }
955ce5f5 2566 ext4_unlock_group(sb, i);
ce421581
JS		 2567 if (!flexbg_flag)
2568 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2569 }
bfff6873
LC		 2570 if (NULL != first_not_zeroed)
2571 *first_not_zeroed = grp;
ac27a0ec
DK		 2572 return 1;
2573}
2574
617ba13b 2575/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2576 * the superblock) which were deleted from all directories, but held open by
2577 * a process at the time of a crash. We walk the list and try to delete these
2578 * inodes at recovery time (only with a read-write filesystem).
2579 *
2580 * In order to keep the orphan inode chain consistent during traversal (in
2581 * case of crash during recovery), we link each inode into the superblock
2582 * orphan list_head and handle it the same way as an inode deletion during
2583 * normal operation (which journals the operations for us).
2584 *
2585 * We only do an iget() and an iput() on each inode, which is very safe if we
2586 * accidentally point at an in-use or already deleted inode. The worst that
2587 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2588 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2589 * e2fsck was run on this filesystem, and it must have already done the orphan
2590 * inode cleanup for us, so we can safely abort without any further action.
2591 */
2b2d6d01
TT		 2592static void ext4_orphan_cleanup(struct super_block *sb,
2593 struct ext4_super_block *es)
ac27a0ec
DK		 2594{
2595 unsigned int s_flags = sb->s_flags;
2c98eb5e 2596 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2597#ifdef CONFIG_QUOTA
95f1fda4 2598 int quota_update = 0;
ac27a0ec
DK		 2599 int i;
2600#endif
2601 if (!es->s_last_orphan) {
2602 jbd_debug(4, "no orphan inodes to clean up\n");
2603 return;
2604 }
2605
a8f48a95 2606 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2607 ext4_msg(sb, KERN_ERR, "write access "
2608 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2609 return;
2610 }
2611
d39195c3
AG		 2612 /* Check if feature set would not allow a r/w mount */
2613 if (!ext4_feature_set_ok(sb, 0)) {
2614 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2615 "unknown ROCOMPAT features");
2616 return;
2617 }
2618
617ba13b 2619 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2620 /* don't clear list on RO mount w/ errors */
1751e8a6 2621 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2622 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2623 "clearing orphan list.\n");
c25f9bc6
ES		 2624 es->s_last_orphan = 0;
2625 }
ac27a0ec
DK		 2626 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2627 return;
2628 }
2629
1751e8a6 2630 if (s_flags & SB_RDONLY) {
b31e1552 2631 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2632 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2633 }
2634#ifdef CONFIG_QUOTA
2635 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2636 sb->s_flags |= SB_ACTIVE;
95f1fda4 2637
2638 /*
2639 * Turn on quotas which were not enabled for read-only mounts if
2640 * filesystem has quota feature, so that they are updated correctly.
2641 */
1751e8a6 2642 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2643 int ret = ext4_enable_quotas(sb);
2644
2645 if (!ret)
2646 quota_update = 1;
2647 else
2648 ext4_msg(sb, KERN_ERR,
2649 "Cannot turn on quotas: error %d", ret);
2650 }
2651
2652 /* Turn on journaled quotas used for old sytle */
a2d4a646 2653 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2654 if (EXT4_SB(sb)->s_qf_names[i]) {
2655 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2656
2657 if (!ret)
2658 quota_update = 1;
2659 else
b31e1552
ES		 2660 ext4_msg(sb, KERN_ERR,
2661 "Cannot turn on journaled "
95f1fda4 2662 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2663 }
2664 }
2665#endif
2666
2667 while (es->s_last_orphan) {
2668 struct inode *inode;
2669
c65d5c6c
VN		 2670 /*
2671 * We may have encountered an error during cleanup; if
2672 * so, skip the rest.
2673 */
2674 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2675 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2676 es->s_last_orphan = 0;
2677 break;
2678 }
2679
97bd42b9
JB		 2680 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2681 if (IS_ERR(inode)) {
ac27a0ec
DK		 2682 es->s_last_orphan = 0;
2683 break;
2684 }
2685
617ba13b 2686 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2687 dquot_initialize(inode);
ac27a0ec 2688 if (inode->i_nlink) {
566370a2
PT		 2689 if (test_opt(sb, DEBUG))
2690 ext4_msg(sb, KERN_DEBUG,
2691 "%s: truncating inode %lu to %lld bytes",
2692 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2693 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2694 inode->i_ino, inode->i_size);
5955102c 2695 inode_lock(inode);
55f252c9 2696 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2697 ret = ext4_truncate(inode);
2698 if (ret)
2699 ext4_std_error(inode->i_sb, ret);
5955102c 2700 inode_unlock(inode);
ac27a0ec
DK		 2701 nr_truncates++;
2702 } else {
566370a2
PT		 2703 if (test_opt(sb, DEBUG))
2704 ext4_msg(sb, KERN_DEBUG,
2705 "%s: deleting unreferenced inode %lu",
2706 __func__, inode->i_ino);
ac27a0ec
DK		 2707 jbd_debug(2, "deleting unreferenced inode %lu\n",
2708 inode->i_ino);
2709 nr_orphans++;
2710 }
2711 iput(inode); /* The delete magic happens here! */
2712 }
2713
2b2d6d01 2714#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2715
2716 if (nr_orphans)
b31e1552
ES		 2717 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2718 PLURAL(nr_orphans));
ac27a0ec 2719 if (nr_truncates)
b31e1552
ES		 2720 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2721 PLURAL(nr_truncates));
ac27a0ec 2722#ifdef CONFIG_QUOTA
95f1fda4 2723 /* Turn off quotas if they were enabled for orphan cleanup */
2724 if (quota_update) {
2725 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2726 if (sb_dqopt(sb)->files[i])
2727 dquot_quota_off(sb, i);
2728 }
ac27a0ec
DK		 2729 }
2730#endif
1751e8a6 2731 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2732}
0b8e58a1 2733
cd2291a4
ES		 2734/*
2735 * Maximal extent format file size.
2736 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2737 * extent format containers, within a sector_t, and within i_blocks
2738 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2739 * so that won't be a limiting factor.
2740 *
f17722f9
LC		 2741 * However there is other limiting factor. We do store extents in the form
2742 * of starting block and length, hence the resulting length of the extent
2743 * covering maximum file size must fit into on-disk format containers as
2744 * well. Given that length is always by 1 unit bigger than max unit (because
2745 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2746 *
cd2291a4
ES		 2747 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2748 */
f287a1a5 2749static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2750{
2751 loff_t res;
2752 loff_t upper_limit = MAX_LFS_FILESIZE;
2753
72deb455
CH		 2754 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2755
2756 if (!has_huge_files) {
cd2291a4
ES		 2757 upper_limit = (1LL << 32) - 1;
2758
2759 /* total blocks in file system block size */
2760 upper_limit >>= (blkbits - 9);
2761 upper_limit <<= blkbits;
2762 }
2763
f17722f9
LC		 2764 /*
2765 * 32-bit extent-start container, ee_block. We lower the maxbytes
2766 * by one fs block, so ee_len can cover the extent of maximum file
2767 * size
2768 */
2769 res = (1LL << 32) - 1;
cd2291a4 2770 res <<= blkbits;
cd2291a4
ES		 2771
2772 /* Sanity check against vm- & vfs- imposed limits */
2773 if (res > upper_limit)
2774 res = upper_limit;
2775
2776 return res;
2777}
ac27a0ec 2778
ac27a0ec 2779/*
cd2291a4 2780 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2781 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2782 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2783 */
f287a1a5 2784static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2785{
617ba13b 2786 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2787 int meta_blocks;
2788 loff_t upper_limit;
0b8e58a1
AD		 2789 /* This is calculated to be the largest file size for a dense, block
2790 * mapped file such that the file's total number of 512-byte sectors,
2791 * including data and all indirect blocks, does not exceed (2^48 - 1).
2792 *
2793 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2794 * number of 512-byte sectors of the file.
0fc1b451
AK		 2795 */
2796
72deb455 2797 if (!has_huge_files) {
0fc1b451 2798 /*
72deb455
CH		 2799 * !has_huge_files or implies that the inode i_block field
2800 * represents total file blocks in 2^32 512-byte sectors ==
2801 * size of vfs inode i_blocks * 8
0fc1b451
AK		 2802 */
2803 upper_limit = (1LL << 32) - 1;
2804
2805 /* total blocks in file system block size */
2806 upper_limit >>= (bits - 9);
2807
2808 } else {
8180a562
AK		 2809 /*
2810 * We use 48 bit ext4_inode i_blocks
2811 * With EXT4_HUGE_FILE_FL set the i_blocks
2812 * represent total number of blocks in
2813 * file system block size
2814 */
0fc1b451
AK		 2815 upper_limit = (1LL << 48) - 1;
2816
0fc1b451
AK		 2817 }
2818
2819 /* indirect blocks */
2820 meta_blocks = 1;
2821 /* double indirect blocks */
2822 meta_blocks += 1 + (1LL << (bits-2));
2823 /* tripple indirect blocks */
2824 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2825
2826 upper_limit -= meta_blocks;
2827 upper_limit <<= bits;
ac27a0ec
DK		 2828
2829 res += 1LL << (bits-2);
2830 res += 1LL << (2*(bits-2));
2831 res += 1LL << (3*(bits-2));
2832 res <<= bits;
2833 if (res > upper_limit)
2834 res = upper_limit;
0fc1b451
AK		 2835
2836 if (res > MAX_LFS_FILESIZE)
2837 res = MAX_LFS_FILESIZE;
2838
ac27a0ec
DK		 2839 return res;
2840}
2841
617ba13b 2842static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2843 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2844{
617ba13b 2845 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2846 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2847 int has_super = 0;
2848
2849 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2850
e2b911c5 2851 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2852 return logical_sb_block + nr + 1;
ac27a0ec 2853 bg = sbi->s_desc_per_block * nr;
617ba13b 2854 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2855 has_super = 1;
0b8e58a1 2856
bd63f6b0
DW		 2857 /*
2858 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2859 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2860 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2861 * compensate.
2862 */
2863 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 2864 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 2865 has_super++;
2866
617ba13b 2867 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2868}
2869
c9de560d
AT		 2870/**
2871 * ext4_get_stripe_size: Get the stripe size.
2872 * @sbi: In memory super block info
2873 *
2874 * If we have specified it via mount option, then
2875 * use the mount option value. If the value specified at mount time is
2876 * greater than the blocks per group use the super block value.
2877 * If the super block value is greater than blocks per group return 0.
2878 * Allocator needs it be less than blocks per group.
2879 *
2880 */
2881static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2882{
2883 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2884 unsigned long stripe_width =
2885 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2886 int ret;
c9de560d
AT		 2887
2888 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2889 ret = sbi->s_stripe;
5469d7c3 2890 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2891 ret = stripe_width;
5469d7c3 2892 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2893 ret = stride;
2894 else
2895 ret = 0;
c9de560d 2896
3eb08658
DE		 2897 /*
2898 * If the stripe width is 1, this makes no sense and
2899 * we set it to 0 to turn off stripe handling code.
2900 */
2901 if (ret <= 1)
2902 ret = 0;
c9de560d 2903
3eb08658 2904 return ret;
c9de560d 2905}
ac27a0ec 2906
a13fb1a4
ES		 2907/*
2908 * Check whether this filesystem can be mounted based on
2909 * the features present and the RDONLY/RDWR mount requested.
2910 * Returns 1 if this filesystem can be mounted as requested,
2911 * 0 if it cannot be.
2912 */
2913static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2914{
e2b911c5 2915 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2916 ext4_msg(sb, KERN_ERR,
2917 "Couldn't mount because of "
2918 "unsupported optional features (%x)",
2919 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2920 ~EXT4_FEATURE_INCOMPAT_SUPP));
2921 return 0;
2922 }
2923
c83ad55e
GKB		 2924#ifndef CONFIG_UNICODE
2925 if (ext4_has_feature_casefold(sb)) {
2926 ext4_msg(sb, KERN_ERR,
2927 "Filesystem with casefold feature cannot be "
2928 "mounted without CONFIG_UNICODE");
2929 return 0;
2930 }
2931#endif
2932
a13fb1a4
ES		 2933 if (readonly)
2934 return 1;
2935
e2b911c5 2936 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 2937 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 2938 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 2939 return 1;
2940 }
2941
a13fb1a4 2942 /* Check that feature set is OK for a read-write mount */
e2b911c5 2943 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2944 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2945 "unsupported optional features (%x)",
2946 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2947 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2948 return 0;
2949 }
e2b911c5 2950 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2951 ext4_msg(sb, KERN_ERR,
2952 "Can't support bigalloc feature without "
2953 "extents feature\n");
2954 return 0;
2955 }
7c319d32
AK		 2956
2957#ifndef CONFIG_QUOTA
e2b911c5 2958 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2959 ext4_msg(sb, KERN_ERR,
2960 "Filesystem with quota feature cannot be mounted RDWR "
2961 "without CONFIG_QUOTA");
2962 return 0;
2963 }
689c958c
LX		 2964 if (ext4_has_feature_project(sb) && !readonly) {
2965 ext4_msg(sb, KERN_ERR,
2966 "Filesystem with project quota feature cannot be mounted RDWR "
2967 "without CONFIG_QUOTA");
2968 return 0;
2969 }
7c319d32 2970#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2971 return 1;
2972}
2973
66e61a9e
TT		 2974/*
2975 * This function is called once a day if we have errors logged
2976 * on the file system
2977 */
235699a8 2978static void print_daily_error_info(struct timer_list *t)
66e61a9e 2979{
235699a8
KC		 2980 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2981 struct super_block *sb = sbi->s_sb;
2982 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 2983
2984 if (es->s_error_count)
ae0f78de
TT		 2985 /* fsck newer than v1.41.13 is needed to clean this condition. */
2986 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2987 le32_to_cpu(es->s_error_count));
2988 if (es->s_first_error_time) {
6a0678a7
AB		 2989 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
2990 sb->s_id,
2991 ext4_get_tstamp(es, s_first_error_time),
66e61a9e
TT		 2992 (int) sizeof(es->s_first_error_func),
2993 es->s_first_error_func,
2994 le32_to_cpu(es->s_first_error_line));
2995 if (es->s_first_error_ino)
651e1c3b 2996 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2997 le32_to_cpu(es->s_first_error_ino));
2998 if (es->s_first_error_block)
651e1c3b 2999 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3000 le64_to_cpu(es->s_first_error_block));
651e1c3b 3001 printk(KERN_CONT "\n");
66e61a9e
TT		 3002 }
3003 if (es->s_last_error_time) {
6a0678a7
AB		 3004 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3005 sb->s_id,
3006 ext4_get_tstamp(es, s_last_error_time),
66e61a9e
TT		 3007 (int) sizeof(es->s_last_error_func),
3008 es->s_last_error_func,
3009 le32_to_cpu(es->s_last_error_line));
3010 if (es->s_last_error_ino)
651e1c3b 3011 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3012 le32_to_cpu(es->s_last_error_ino));
3013 if (es->s_last_error_block)
651e1c3b 3014 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3015 le64_to_cpu(es->s_last_error_block));
651e1c3b 3016 printk(KERN_CONT "\n");
66e61a9e
TT		 3017 }
3018 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3019}
3020
bfff6873
LC		 3021/* Find next suitable group and run ext4_init_inode_table */
3022static int ext4_run_li_request(struct ext4_li_request *elr)
3023{
3024 struct ext4_group_desc *gdp = NULL;
3025 ext4_group_t group, ngroups;
3026 struct super_block *sb;
3027 unsigned long timeout = 0;
3028 int ret = 0;
3029
3030 sb = elr->lr_super;
3031 ngroups = EXT4_SB(sb)->s_groups_count;
3032
3033 for (group = elr->lr_next_group; group < ngroups; group++) {
3034 gdp = ext4_get_group_desc(sb, group, NULL);
3035 if (!gdp) {
3036 ret = 1;
3037 break;
3038 }
3039
3040 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3041 break;
3042 }
3043
7f511862 3044 if (group >= ngroups)
bfff6873
LC		 3045 ret = 1;
3046
3047 if (!ret) {
3048 timeout = jiffies;
3049 ret = ext4_init_inode_table(sb, group,
3050 elr->lr_timeout ? 0 : 1);
3051 if (elr->lr_timeout == 0) {
51ce6511
LC		 3052 timeout = (jiffies - timeout) *
3053 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 3054 elr->lr_timeout = timeout;
3055 }
3056 elr->lr_next_sched = jiffies + elr->lr_timeout;
3057 elr->lr_next_group = group + 1;
3058 }
bfff6873
LC		 3059 return ret;
3060}
3061
3062/*
3063 * Remove lr_request from the list_request and free the
4ed5c033 3064 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 3065 */
3066static void ext4_remove_li_request(struct ext4_li_request *elr)
3067{
3068 struct ext4_sb_info *sbi;
3069
3070 if (!elr)
3071 return;
3072
3073 sbi = elr->lr_sbi;
3074
3075 list_del(&elr->lr_request);
3076 sbi->s_li_request = NULL;
3077 kfree(elr);
3078}
3079
3080static void ext4_unregister_li_request(struct super_block *sb)
3081{
1bb933fb
LC		 3082 mutex_lock(&ext4_li_mtx);
3083 if (!ext4_li_info) {
3084 mutex_unlock(&ext4_li_mtx);
bfff6873 3085 return;
1bb933fb 3086 }
bfff6873
LC		 3087
3088 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3089 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3090 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3091 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3092}
3093
8f1f7453
ES		 3094static struct task_struct *ext4_lazyinit_task;
3095
bfff6873
LC		 3096/*
3097 * This is the function where ext4lazyinit thread lives. It walks
3098 * through the request list searching for next scheduled filesystem.
3099 * When such a fs is found, run the lazy initialization request
3100 * (ext4_rn_li_request) and keep track of the time spend in this
3101 * function. Based on that time we compute next schedule time of
3102 * the request. When walking through the list is complete, compute
3103 * next waking time and put itself into sleep.
3104 */
3105static int ext4_lazyinit_thread(void *arg)
3106{
3107 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3108 struct list_head *pos, *n;
3109 struct ext4_li_request *elr;
4ed5c033 3110 unsigned long next_wakeup, cur;
bfff6873
LC		 3111
3112 BUG_ON(NULL == eli);
3113
bfff6873
LC		 3114cont_thread:
3115 while (true) {
3116 next_wakeup = MAX_JIFFY_OFFSET;
3117
3118 mutex_lock(&eli->li_list_mtx);
3119 if (list_empty(&eli->li_request_list)) {
3120 mutex_unlock(&eli->li_list_mtx);
3121 goto exit_thread;
3122 }
bfff6873 3123 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3124 int err = 0;
3125 int progress = 0;
bfff6873
LC		 3126 elr = list_entry(pos, struct ext4_li_request,
3127 lr_request);
3128
e22834f0
DM		 3129 if (time_before(jiffies, elr->lr_next_sched)) {
3130 if (time_before(elr->lr_next_sched, next_wakeup))
3131 next_wakeup = elr->lr_next_sched;
3132 continue;
3133 }
3134 if (down_read_trylock(&elr->lr_super->s_umount)) {
3135 if (sb_start_write_trylock(elr->lr_super)) {
3136 progress = 1;
3137 /*
3138 * We hold sb->s_umount, sb can not
3139 * be removed from the list, it is
3140 * now safe to drop li_list_mtx
3141 */
3142 mutex_unlock(&eli->li_list_mtx);
3143 err = ext4_run_li_request(elr);
3144 sb_end_write(elr->lr_super);
3145 mutex_lock(&eli->li_list_mtx);
3146 n = pos->next;
b2c78cd0 3147 }
e22834f0
DM		 3148 up_read((&elr->lr_super->s_umount));
3149 }
3150 /* error, remove the lazy_init job */
3151 if (err) {
3152 ext4_remove_li_request(elr);
3153 continue;
3154 }
3155 if (!progress) {
3156 elr->lr_next_sched = jiffies +
3157 (prandom_u32()
3158 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3159 }
bfff6873
LC		 3160 if (time_before(elr->lr_next_sched, next_wakeup))
3161 next_wakeup = elr->lr_next_sched;
3162 }
3163 mutex_unlock(&eli->li_list_mtx);
3164
a0acae0e 3165 try_to_freeze();
bfff6873 3166
4ed5c033
LC		 3167 cur = jiffies;
3168 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3169 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3170 cond_resched();
3171 continue;
3172 }
3173
4ed5c033
LC		 3174 schedule_timeout_interruptible(next_wakeup - cur);
3175
8f1f7453
ES		 3176 if (kthread_should_stop()) {
3177 ext4_clear_request_list();
3178 goto exit_thread;
3179 }
bfff6873
LC		 3180 }
3181
3182exit_thread:
3183 /*
3184 * It looks like the request list is empty, but we need
3185 * to check it under the li_list_mtx lock, to prevent any
3186 * additions into it, and of course we should lock ext4_li_mtx
3187 * to atomically free the list and ext4_li_info, because at
3188 * this point another ext4 filesystem could be registering
3189 * new one.
3190 */
3191 mutex_lock(&ext4_li_mtx);
3192 mutex_lock(&eli->li_list_mtx);
3193 if (!list_empty(&eli->li_request_list)) {
3194 mutex_unlock(&eli->li_list_mtx);
3195 mutex_unlock(&ext4_li_mtx);
3196 goto cont_thread;
3197 }
3198 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3199 kfree(ext4_li_info);
3200 ext4_li_info = NULL;
3201 mutex_unlock(&ext4_li_mtx);
3202
3203 return 0;
3204}
3205
3206static void ext4_clear_request_list(void)
3207{
3208 struct list_head *pos, *n;
3209 struct ext4_li_request *elr;
3210
3211 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3212 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3213 elr = list_entry(pos, struct ext4_li_request,
3214 lr_request);
3215 ext4_remove_li_request(elr);
3216 }
3217 mutex_unlock(&ext4_li_info->li_list_mtx);
3218}
3219
3220static int ext4_run_lazyinit_thread(void)
3221{
8f1f7453
ES		 3222 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3223 ext4_li_info, "ext4lazyinit");
3224 if (IS_ERR(ext4_lazyinit_task)) {
3225 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3226 ext4_clear_request_list();
bfff6873
LC		 3227 kfree(ext4_li_info);
3228 ext4_li_info = NULL;
92b97816 3229 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3230 "initialization thread\n",
3231 err);
3232 return err;
3233 }
3234 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3235 return 0;
3236}
3237
3238/*
3239 * Check whether it make sense to run itable init. thread or not.
3240 * If there is at least one uninitialized inode table, return
3241 * corresponding group number, else the loop goes through all
3242 * groups and return total number of groups.
3243 */
3244static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3245{
3246 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3247 struct ext4_group_desc *gdp = NULL;
3248
8844618d
TT		 3249 if (!ext4_has_group_desc_csum(sb))
3250 return ngroups;
3251
bfff6873
LC		 3252 for (group = 0; group < ngroups; group++) {
3253 gdp = ext4_get_group_desc(sb, group, NULL);
3254 if (!gdp)
3255 continue;
3256
50122847 3257 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3258 break;
3259 }
3260
3261 return group;
3262}
3263
3264static int ext4_li_info_new(void)
3265{
3266 struct ext4_lazy_init *eli = NULL;
3267
3268 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3269 if (!eli)
3270 return -ENOMEM;
3271
bfff6873
LC		 3272 INIT_LIST_HEAD(&eli->li_request_list);
3273 mutex_init(&eli->li_list_mtx);
3274
bfff6873
LC		 3275 eli->li_state |= EXT4_LAZYINIT_QUIT;
3276
3277 ext4_li_info = eli;
3278
3279 return 0;
3280}
3281
3282static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3283 ext4_group_t start)
3284{
3285 struct ext4_sb_info *sbi = EXT4_SB(sb);
3286 struct ext4_li_request *elr;
bfff6873
LC		 3287
3288 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3289 if (!elr)
3290 return NULL;
3291
3292 elr->lr_super = sb;
3293 elr->lr_sbi = sbi;
3294 elr->lr_next_group = start;
3295
3296 /*
3297 * Randomize first schedule time of the request to
3298 * spread the inode table initialization requests
3299 * better.
3300 */
dd1f723b
TT		 3301 elr->lr_next_sched = jiffies + (prandom_u32() %
3302 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3303 return elr;
3304}
3305
7f511862
TT		 3306int ext4_register_li_request(struct super_block *sb,
3307 ext4_group_t first_not_zeroed)
bfff6873
LC		 3308{
3309 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3310 struct ext4_li_request *elr = NULL;
49598e04 3311 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3312 int ret = 0;
bfff6873 3313
7f511862 3314 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3315 if (sbi->s_li_request != NULL) {
3316 /*
3317 * Reset timeout so it can be computed again, because
3318 * s_li_wait_mult might have changed.
3319 */
3320 sbi->s_li_request->lr_timeout = 0;
7f511862 3321 goto out;
51ce6511 3322 }
bfff6873 3323
bc98a42c 3324 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
55ff3840 3325 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3326 goto out;
bfff6873
LC		 3327
3328 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3329 if (!elr) {
3330 ret = -ENOMEM;
3331 goto out;
3332 }
bfff6873
LC		 3333
3334 if (NULL == ext4_li_info) {
3335 ret = ext4_li_info_new();
3336 if (ret)
3337 goto out;
3338 }
3339
3340 mutex_lock(&ext4_li_info->li_list_mtx);
3341 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3342 mutex_unlock(&ext4_li_info->li_list_mtx);
3343
3344 sbi->s_li_request = elr;
46e4690b
TM		 3345 /*
3346 * set elr to NULL here since it has been inserted to
3347 * the request_list and the removal and free of it is
3348 * handled by ext4_clear_request_list from now on.
3349 */
3350 elr = NULL;
bfff6873
LC		 3351
3352 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3353 ret = ext4_run_lazyinit_thread();
3354 if (ret)
3355 goto out;
3356 }
bfff6873 3357out:
beed5ecb
NK		 3358 mutex_unlock(&ext4_li_mtx);
3359 if (ret)
bfff6873 3360 kfree(elr);
bfff6873
LC		 3361 return ret;
3362}
3363
3364/*
3365 * We do not need to lock anything since this is called on
3366 * module unload.
3367 */
3368static void ext4_destroy_lazyinit_thread(void)
3369{
3370 /*
3371 * If thread exited earlier
3372 * there's nothing to be done.
3373 */
8f1f7453 3374 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3375 return;
3376
8f1f7453 3377 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3378}
3379
25ed6e8a
DW		 3380static int set_journal_csum_feature_set(struct super_block *sb)
3381{
3382 int ret = 1;
3383 int compat, incompat;
3384 struct ext4_sb_info *sbi = EXT4_SB(sb);
3385
9aa5d32b 3386 if (ext4_has_metadata_csum(sb)) {
db9ee220 3387 /* journal checksum v3 */
25ed6e8a 3388 compat = 0;
db9ee220 3389 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3390 } else {
3391 /* journal checksum v1 */
3392 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3393 incompat = 0;
3394 }
3395
feb8c6d3
DW		 3396 jbd2_journal_clear_features(sbi->s_journal,
3397 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3398 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3399 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3400 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3401 ret = jbd2_journal_set_features(sbi->s_journal,
3402 compat, 0,
3403 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3404 incompat);
3405 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3406 ret = jbd2_journal_set_features(sbi->s_journal,
3407 compat, 0,
3408 incompat);
3409 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3410 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3411 } else {
feb8c6d3
DW		 3412 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3413 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3414 }
3415
3416 return ret;
3417}
3418
952fc18e
TT		 3419/*
3420 * Note: calculating the overhead so we can be compatible with
3421 * historical BSD practice is quite difficult in the face of
3422 * clusters/bigalloc. This is because multiple metadata blocks from
3423 * different block group can end up in the same allocation cluster.
3424 * Calculating the exact overhead in the face of clustered allocation
3425 * requires either O(all block bitmaps) in memory or O(number of block
3426 * groups**2) in time. We will still calculate the superblock for
3427 * older file systems --- and if we come across with a bigalloc file
3428 * system with zero in s_overhead_clusters the estimate will be close to
3429 * correct especially for very large cluster sizes --- but for newer
3430 * file systems, it's better to calculate this figure once at mkfs
3431 * time, and store it in the superblock. If the superblock value is
3432 * present (even for non-bigalloc file systems), we will use it.
3433 */
3434static int count_overhead(struct super_block *sb, ext4_group_t grp,
3435 char *buf)
3436{
3437 struct ext4_sb_info *sbi = EXT4_SB(sb);
3438 struct ext4_group_desc *gdp;
3439 ext4_fsblk_t first_block, last_block, b;
3440 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3441 int s, j, count = 0;
3442
e2b911c5 3443 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3444 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3445 sbi->s_itb_per_group + 2);
3446
952fc18e
TT		 3447 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3448 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3449 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3450 for (i = 0; i < ngroups; i++) {
3451 gdp = ext4_get_group_desc(sb, i, NULL);
3452 b = ext4_block_bitmap(sb, gdp);
3453 if (b >= first_block && b <= last_block) {
3454 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3455 count++;
3456 }
3457 b = ext4_inode_bitmap(sb, gdp);
3458 if (b >= first_block && b <= last_block) {
3459 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3460 count++;
3461 }
3462 b = ext4_inode_table(sb, gdp);
3463 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3464 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3465 int c = EXT4_B2C(sbi, b - first_block);
3466 ext4_set_bit(c, buf);
3467 count++;
3468 }
3469 if (i != grp)
3470 continue;
3471 s = 0;
3472 if (ext4_bg_has_super(sb, grp)) {
3473 ext4_set_bit(s++, buf);
3474 count++;
3475 }
c48ae41b
TT		 3476 j = ext4_bg_num_gdb(sb, grp);
3477 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3478 ext4_error(sb, "Invalid number of block group "
3479 "descriptor blocks: %d", j);
3480 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3481 }
c48ae41b
TT		 3482 count += j;
3483 for (; j > 0; j--)
3484 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3485 }
3486 if (!count)
3487 return 0;
3488 return EXT4_CLUSTERS_PER_GROUP(sb) -
3489 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3490}
3491
3492/*
3493 * Compute the overhead and stash it in sbi->s_overhead
3494 */
3495int ext4_calculate_overhead(struct super_block *sb)
3496{
3497 struct ext4_sb_info *sbi = EXT4_SB(sb);
3498 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3499 struct inode *j_inode;
3500 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3501 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3502 ext4_fsblk_t overhead = 0;
4fdb5543 3503 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3504
952fc18e
TT		 3505 if (!buf)
3506 return -ENOMEM;
3507
3508 /*
3509 * Compute the overhead (FS structures). This is constant
3510 * for a given filesystem unless the number of block groups
3511 * changes so we cache the previous value until it does.
3512 */
3513
3514 /*
3515 * All of the blocks before first_data_block are overhead
3516 */
3517 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3518
3519 /*
3520 * Add the overhead found in each block group
3521 */
3522 for (i = 0; i < ngroups; i++) {
3523 int blks;
3524
3525 blks = count_overhead(sb, i, buf);
3526 overhead += blks;
3527 if (blks)
3528 memset(buf, 0, PAGE_SIZE);
3529 cond_resched();
3530 }
3c816ded
EW		 3531
3532 /*
3533 * Add the internal journal blocks whether the journal has been
3534 * loaded or not
3535 */
b003b524 3536 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3537 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3538 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3539 j_inode = ext4_get_journal_inode(sb, j_inum);
3540 if (j_inode) {
3541 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3542 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3543 iput(j_inode);
3544 } else {
3545 ext4_msg(sb, KERN_ERR, "can't get journal size");
3546 }
3547 }
952fc18e
TT		 3548 sbi->s_overhead = overhead;
3549 smp_wmb();
3550 free_page((unsigned long) buf);
3551 return 0;
3552}
3553
7bc04c5c
BR		 3554static void ext4_clamp_want_extra_isize(struct super_block *sb)
3555{
3556 struct ext4_sb_info *sbi = EXT4_SB(sb);
3557 struct ext4_super_block *es = sbi->s_es;
3558
3559 /* determine the minimum size of new large inodes, if present */
3560 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
3561 sbi->s_want_extra_isize == 0) {
3562 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3563 EXT4_GOOD_OLD_INODE_SIZE;
3564 if (ext4_has_feature_extra_isize(sb)) {
3565 if (sbi->s_want_extra_isize <
3566 le16_to_cpu(es->s_want_extra_isize))
3567 sbi->s_want_extra_isize =
3568 le16_to_cpu(es->s_want_extra_isize);
3569 if (sbi->s_want_extra_isize <
3570 le16_to_cpu(es->s_min_extra_isize))
3571 sbi->s_want_extra_isize =
3572 le16_to_cpu(es->s_min_extra_isize);
3573 }
3574 }
3575 /* Check if enough inode space is available */
3576 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3577 sbi->s_inode_size) {
3578 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3579 EXT4_GOOD_OLD_INODE_SIZE;
3580 ext4_msg(sb, KERN_INFO,
3581 "required extra inode space not available");
3582 }
3583}
3584
b5799018 3585static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3586{
3587 ext4_fsblk_t resv_clusters;
b5799018 3588 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3589
30fac0f7
JK		 3590 /*
3591 * There's no need to reserve anything when we aren't using extents.
3592 * The space estimates are exact, there are no unwritten extents,
3593 * hole punching doesn't need new metadata... This is needed especially
3594 * to keep ext2/3 backward compatibility.
3595 */
e2b911c5 3596 if (!ext4_has_feature_extents(sb))
b5799018 3597 return;
27dd4385
LC		 3598 /*
3599 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3600 * This should cover the situations where we can not afford to run
3601 * out of space like for example punch hole, or converting
556615dc 3602 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3603 * allocation would require 1, or 2 blocks, higher numbers are
3604 * very rare.
3605 */
b5799018
TT		 3606 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3607 sbi->s_cluster_bits);
27dd4385
LC		 3608
3609 do_div(resv_clusters, 50);
3610 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3611
b5799018 3612 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3613}
3614
2b2d6d01 3615static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3616{
5e405595 3617 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3618 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3619 struct buffer_head *bh;
617ba13b 3620 struct ext4_super_block *es = NULL;
5aee0f8a 3621 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3622 ext4_fsblk_t block;
3623 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3624 ext4_fsblk_t logical_sb_block;
ac27a0ec 3625 unsigned long offset = 0;
ac27a0ec
DK		 3626 unsigned long journal_devnum = 0;
3627 unsigned long def_mount_opts;
3628 struct inode *root;
0390131b 3629 const char *descr;
dcc7dae3 3630 int ret = -ENOMEM;
281b5995 3631 int blocksize, clustersize;
4ec11028
TT		 3632 unsigned int db_count;
3633 unsigned int i;
281b5995 3634 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3635 __u64 blocks_count;
07aa2ea1 3636 int err = 0;
b3881f74 3637 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3638 ext4_group_t first_not_zeroed;
ac27a0ec 3639
5aee0f8a
TT		 3640 if ((data && !orig_data) || !sbi)
3641 goto out_free_base;
705895b6 3642
aed9eb1b 3643 sbi->s_daxdev = dax_dev;
705895b6
PE		 3644 sbi->s_blockgroup_lock =
3645 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3646 if (!sbi->s_blockgroup_lock)
3647 goto out_free_base;
3648
ac27a0ec 3649 sb->s_fs_info = sbi;
2c0544b2 3650 sbi->s_sb = sb;
240799cd 3651 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3652 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3653 if (sb->s_bdev->bd_part)
3654 sbi->s_sectors_written_start =
dbae2c55 3655 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
ac27a0ec 3656
9f6200bb 3657 /* Cleanup superblock name */
ec3904dc 3658 strreplace(sb->s_id, '/', '!');
9f6200bb 3659
07aa2ea1 3660 /* -EINVAL is default */
dcc7dae3 3661 ret = -EINVAL;
617ba13b 3662 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3663 if (!blocksize) {
b31e1552 3664 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3665 goto out_fail;
3666 }
3667
3668 /*
617ba13b 3669 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3670 * block sizes. We need to calculate the offset from buffer start.
3671 */
617ba13b 3672 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3673 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3674 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3675 } else {
70bbb3e0 3676 logical_sb_block = sb_block;
ac27a0ec
DK		 3677 }
3678
a8ac900b 3679 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3680 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3681 goto out_fail;
3682 }
3683 /*
3684 * Note: s_es must be initialized as soon as possible because
617ba13b 3685 * some ext4 macro-instructions depend on its value
ac27a0ec 3686 */
2716b802 3687 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3688 sbi->s_es = es;
3689 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3690 if (sb->s_magic != EXT4_SUPER_MAGIC)
3691 goto cantfind_ext4;
afc32f7e 3692 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3693
feb0ab32 3694 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3695 if (ext4_has_feature_metadata_csum(sb) &&
3696 ext4_has_feature_gdt_csum(sb))
363307e6 3697 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3698 "redundant flags; please run fsck.");
3699
d25425f8
DW		 3700 /* Check for a known checksum algorithm */
3701 if (!ext4_verify_csum_type(sb, es)) {
3702 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3703 "unknown checksum algorithm.");
3704 silent = 1;
3705 goto cantfind_ext4;
3706 }
3707
0441984a 3708 /* Load the checksum driver */
a45403b5
TT		 3709 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3710 if (IS_ERR(sbi->s_chksum_driver)) {
3711 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3712 ret = PTR_ERR(sbi->s_chksum_driver);
3713 sbi->s_chksum_driver = NULL;
3714 goto failed_mount;
0441984a
DW		 3715 }
3716
a9c47317
DW		 3717 /* Check superblock checksum */
3718 if (!ext4_superblock_csum_verify(sb, es)) {
3719 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3720 "invalid superblock checksum. Run e2fsck?");
3721 silent = 1;
6a797d27 3722 ret = -EFSBADCRC;
a9c47317
DW		 3723 goto cantfind_ext4;
3724 }
3725
3726 /* Precompute checksum seed for all metadata */
e2b911c5 3727 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3728 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3729 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3730 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3731 sizeof(es->s_uuid));
3732
ac27a0ec
DK		 3733 /* Set defaults before we parse the mount options */
3734 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3735 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3736 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3737 set_opt(sb, DEBUG);
87f26807 3738 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3739 set_opt(sb, GRPID);
617ba13b 3740 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3741 set_opt(sb, NO_UID32);
ea663336 3742 /* xattr user namespace & acls are now defaulted on */
ea663336 3743 set_opt(sb, XATTR_USER);
03010a33 3744#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3745 set_opt(sb, POSIX_ACL);
2e7842b8 3746#endif
98c1a759
DW		 3747 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3748 if (ext4_has_metadata_csum(sb))
3749 set_opt(sb, JOURNAL_CHECKSUM);
3750
617ba13b 3751 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3752 set_opt(sb, JOURNAL_DATA);
617ba13b 3753 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3754 set_opt(sb, ORDERED_DATA);
617ba13b 3755 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3756 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3757
3758 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3759 set_opt(sb, ERRORS_PANIC);
bb4f397a 3760 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3761 set_opt(sb, ERRORS_CONT);
bb4f397a 3762 else
fd8c37ec 3763 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3764 /* block_validity enabled by default; disable with noblock_validity */
3765 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3766 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3767 set_opt(sb, DISCARD);
ac27a0ec 3768
08cefc7a
EB		 3769 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3770 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3771 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3772 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3773 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3774
8b67f04a 3775 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3776 set_opt(sb, BARRIER);
ac27a0ec 3777
dd919b98
AK		 3778 /*
3779 * enable delayed allocation by default
3780 * Use -o nodelalloc to turn it off
3781 */
bc0b75f7 3782 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3783 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3784 set_opt(sb, DELALLOC);
dd919b98 3785
51ce6511
LC		 3786 /*
3787 * set default s_li_wait_mult for lazyinit, for the case there is
3788 * no mount option specified.
3789 */
3790 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3791
5aee0f8a
TT		 3792 if (sbi->s_es->s_mount_opts[0]) {
3793 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3794 sizeof(sbi->s_es->s_mount_opts),
3795 GFP_KERNEL);
3796 if (!s_mount_opts)
3797 goto failed_mount;
3798 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3799 &journal_ioprio, 0)) {
3800 ext4_msg(sb, KERN_WARNING,
3801 "failed to parse options in superblock: %s",
3802 s_mount_opts);
3803 }
3804 kfree(s_mount_opts);
8b67f04a 3805 }
5a916be1 3806 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3807 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3808 &journal_ioprio, 0))
ac27a0ec
DK		 3809 goto failed_mount;
3810
c83ad55e
GKB		 3811#ifdef CONFIG_UNICODE
3812 if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
3813 const struct ext4_sb_encodings *encoding_info;
3814 struct unicode_map *encoding;
3815 __u16 encoding_flags;
3816
3817 if (ext4_has_feature_encrypt(sb)) {
3818 ext4_msg(sb, KERN_ERR,
3819 "Can't mount with encoding and encryption");
3820 goto failed_mount;
3821 }
3822
3823 if (ext4_sb_read_encoding(es, &encoding_info,
3824 &encoding_flags)) {
3825 ext4_msg(sb, KERN_ERR,
3826 "Encoding requested by superblock is unknown");
3827 goto failed_mount;
3828 }
3829
3830 encoding = utf8_load(encoding_info->version);
3831 if (IS_ERR(encoding)) {
3832 ext4_msg(sb, KERN_ERR,
3833 "can't mount with superblock charset: %s-%s "
3834 "not supported by the kernel. flags: 0x%x.",
3835 encoding_info->name, encoding_info->version,
3836 encoding_flags);
3837 goto failed_mount;
3838 }
3839 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
3840 "%s-%s with flags 0x%hx", encoding_info->name,
3841 encoding_info->version?:"\b", encoding_flags);
3842
3843 sbi->s_encoding = encoding;
3844 sbi->s_encoding_flags = encoding_flags;
3845 }
3846#endif
3847
56889787
TT		 3848 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3849 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3850 "with data=journal disables delayed "
3851 "allocation and O_DIRECT support!\n");
3852 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3853 ext4_msg(sb, KERN_ERR, "can't mount with "
3854 "both data=journal and delalloc");
3855 goto failed_mount;
3856 }
3857 if (test_opt(sb, DIOREAD_NOLOCK)) {
3858 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3859 "both data=journal and dioread_nolock");
56889787
TT		 3860 goto failed_mount;
3861 }
923ae0ff
RZ		 3862 if (test_opt(sb, DAX)) {
3863 ext4_msg(sb, KERN_ERR, "can't mount with "
3864 "both data=journal and dax");
3865 goto failed_mount;
3866 }
73b92a2a
SK		 3867 if (ext4_has_feature_encrypt(sb)) {
3868 ext4_msg(sb, KERN_WARNING,
3869 "encrypted files will use data=ordered "
3870 "instead of data journaling mode");
3871 }
56889787
TT		 3872 if (test_opt(sb, DELALLOC))
3873 clear_opt(sb, DELALLOC);
001e4a87
TH		 3874 } else {
3875 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3876 }
3877
1751e8a6
LT		 3878 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3879 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 3880
617ba13b 3881 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3882 (ext4_has_compat_features(sb) ||
3883 ext4_has_ro_compat_features(sb) ||
3884 ext4_has_incompat_features(sb)))
b31e1552
ES		 3885 ext4_msg(sb, KERN_WARNING,
3886 "feature flags set on rev 0 fs, "
3887 "running e2fsck is recommended");
469108ff 3888
ed3654eb
TT		 3889 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3890 set_opt2(sb, HURD_COMPAT);
e2b911c5 3891 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3892 ext4_msg(sb, KERN_ERR,
3893 "The Hurd can't support 64-bit file systems");
3894 goto failed_mount;
3895 }
dec214d0
TE		 3896
3897 /*
3898 * ea_inode feature uses l_i_version field which is not
3899 * available in HURD_COMPAT mode.
3900 */
3901 if (ext4_has_feature_ea_inode(sb)) {
3902 ext4_msg(sb, KERN_ERR,
3903 "ea_inode feature is not supported for Hurd");
3904 goto failed_mount;
3905 }
ed3654eb
TT		 3906 }
3907
2035e776
TT		 3908 if (IS_EXT2_SB(sb)) {
3909 if (ext2_feature_set_ok(sb))
3910 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3911 "using the ext4 subsystem");
3912 else {
0d9366d6
ES		 3913 /*
3914 * If we're probing be silent, if this looks like
3915 * it's actually an ext[34] filesystem.
3916 */
3917 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3918 goto failed_mount;
2035e776
TT		 3919 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3920 "to feature incompatibilities");
3921 goto failed_mount;
3922 }
3923 }
3924
3925 if (IS_EXT3_SB(sb)) {
3926 if (ext3_feature_set_ok(sb))
3927 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3928 "using the ext4 subsystem");
3929 else {
0d9366d6
ES		 3930 /*
3931 * If we're probing be silent, if this looks like
3932 * it's actually an ext4 filesystem.
3933 */
3934 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3935 goto failed_mount;
2035e776
TT		 3936 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3937 "to feature incompatibilities");
3938 goto failed_mount;
3939 }
3940 }
3941
ac27a0ec
DK		 3942 /*
3943 * Check feature flags regardless of the revision level, since we
3944 * previously didn't change the revision level when setting the flags,
3945 * so there is a chance incompat flags are set on a rev 0 filesystem.
3946 */
bc98a42c 3947 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 3948 goto failed_mount;
a13fb1a4 3949
261cb20c 3950 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3951 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3952 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552 3953 ext4_msg(sb, KERN_ERR,
8cdf3372
TT		 3954 "Unsupported filesystem blocksize %d (%d log_block_size)",
3955 blocksize, le32_to_cpu(es->s_log_block_size));
3956 goto failed_mount;
3957 }
3958 if (le32_to_cpu(es->s_log_block_size) >
3959 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3960 ext4_msg(sb, KERN_ERR,
3961 "Invalid log block size: %u",
3962 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3963 goto failed_mount;
3964 }
bfe0a5f4
TT		 3965 if (le32_to_cpu(es->s_log_cluster_size) >
3966 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3967 ext4_msg(sb, KERN_ERR,
3968 "Invalid log cluster size: %u",
3969 le32_to_cpu(es->s_log_cluster_size));
3970 goto failed_mount;
3971 }
ac27a0ec 3972
5b9554dc
TT		 3973 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3974 ext4_msg(sb, KERN_ERR,
3975 "Number of reserved GDT blocks insanely large: %d",
3976 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3977 goto failed_mount;
3978 }
3979
923ae0ff 3980 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
559db4c6
RZ		 3981 if (ext4_has_feature_inline_data(sb)) {
3982 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3983 " that may contain inline data");
361d24d4 3984 goto failed_mount;
559db4c6 3985 }
80660f20 3986 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
24f3478d 3987 ext4_msg(sb, KERN_ERR,
361d24d4
ES		 3988 "DAX unsupported by block device.");
3989 goto failed_mount;
24f3478d 3990 }
923ae0ff
RZ		 3991 }
3992
e2b911c5 3993 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3994 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3995 es->s_encryption_level);
3996 goto failed_mount;
3997 }
3998
ac27a0ec 3999 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 4000 /* Validate the filesystem blocksize */
4001 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 4002 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 4003 blocksize);
ac27a0ec
DK		 4004 goto failed_mount;
4005 }
4006
2b2d6d01 4007 brelse(bh);
70bbb3e0
AM		 4008 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4009 offset = do_div(logical_sb_block, blocksize);
a8ac900b 4010 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 4011 if (!bh) {
b31e1552
ES		 4012 ext4_msg(sb, KERN_ERR,
4013 "Can't read superblock on 2nd try");
ac27a0ec
DK		 4014 goto failed_mount;
4015 }
2716b802 4016 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 4017 sbi->s_es = es;
617ba13b 4018 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 4019 ext4_msg(sb, KERN_ERR,
4020 "Magic mismatch, very weird!");
ac27a0ec
DK		 4021 goto failed_mount;
4022 }
4023 }
4024
e2b911c5 4025 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 4026 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4027 has_huge_files);
4028 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 4029
617ba13b
MC		 4030 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4031 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4032 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 4033 } else {
4034 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4035 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
c37e9e01
TT		 4036 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4037 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4038 sbi->s_first_ino);
4039 goto failed_mount;
4040 }
617ba13b 4041 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 4042 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 4043 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 4044 ext4_msg(sb, KERN_ERR,
4045 "unsupported inode size: %d",
2b2d6d01 4046 sbi->s_inode_size);
ac27a0ec
DK		 4047 goto failed_mount;
4048 }
4881c497
DD		 4049 /*
4050 * i_atime_extra is the last extra field available for [acm]times in
4051 * struct ext4_inode. Checking for that field should suffice to ensure
4052 * we have extra space for all three.
4053 */
4054 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4055 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4056 sb->s_time_gran = 1;
4057 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4058 } else {
4059 sb->s_time_gran = NSEC_PER_SEC;
4060 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4061 }
4062
4063 sb->s_time_min = EXT4_TIMESTAMP_MIN;
ac27a0ec 4064 }
0b8e58a1 4065
0d1ee42f 4066 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 4067 if (ext4_has_feature_64bit(sb)) {
8fadc143 4068 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 4069 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 4070 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 4071 ext4_msg(sb, KERN_ERR,
4072 "unsupported descriptor size %lu",
0d1ee42f
AR		 4073 sbi->s_desc_size);
4074 goto failed_mount;
4075 }
4076 } else
4077 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 4078
ac27a0ec 4079 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 4080 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 4081
617ba13b 4082 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 4083 if (sbi->s_inodes_per_block == 0)
617ba13b 4084 goto cantfind_ext4;
cd6bb35b
TT		 4085 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4086 sbi->s_inodes_per_group > blocksize * 8) {
4087 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4088 sbi->s_blocks_per_group);
4089 goto failed_mount;
4090 }
ac27a0ec
DK		 4091 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4092 sbi->s_inodes_per_block;
0d1ee42f 4093 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 4094 sbi->s_sbh = bh;
4095 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 4096 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4097 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 4098
2b2d6d01 4099 for (i = 0; i < 4; i++)
ac27a0ec
DK		 4100 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4101 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 4102 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 4103 i = le32_to_cpu(es->s_flags);
4104 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4105 sbi->s_hash_unsigned = 3;
4106 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 4107#ifdef __CHAR_UNSIGNED__
bc98a42c 4108 if (!sb_rdonly(sb))
23301410
TT		 4109 es->s_flags |=
4110 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4111 sbi->s_hash_unsigned = 3;
f99b2589 4112#else
bc98a42c 4113 if (!sb_rdonly(sb))
23301410
TT		 4114 es->s_flags |=
4115 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 4116#endif
23301410 4117 }
f99b2589 4118 }
ac27a0ec 4119
281b5995
TT		 4120 /* Handle clustersize */
4121 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 4122 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 4123 if (has_bigalloc) {
4124 if (clustersize < blocksize) {
4125 ext4_msg(sb, KERN_ERR,
4126 "cluster size (%d) smaller than "
4127 "block size (%d)", clustersize, blocksize);
4128 goto failed_mount;
4129 }
4130 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4131 le32_to_cpu(es->s_log_block_size);
4132 sbi->s_clusters_per_group =
4133 le32_to_cpu(es->s_clusters_per_group);
4134 if (sbi->s_clusters_per_group > blocksize * 8) {
4135 ext4_msg(sb, KERN_ERR,
4136 "#clusters per group too big: %lu",
4137 sbi->s_clusters_per_group);
4138 goto failed_mount;
4139 }
4140 if (sbi->s_blocks_per_group !=
4141 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4142 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4143 "clusters per group (%lu) inconsistent",
4144 sbi->s_blocks_per_group,
4145 sbi->s_clusters_per_group);
4146 goto failed_mount;
4147 }
4148 } else {
4149 if (clustersize != blocksize) {
bfe0a5f4
TT		 4150 ext4_msg(sb, KERN_ERR,
4151 "fragment/cluster size (%d) != "
4152 "block size (%d)", clustersize, blocksize);
4153 goto failed_mount;
281b5995
TT		 4154 }
4155 if (sbi->s_blocks_per_group > blocksize * 8) {
4156 ext4_msg(sb, KERN_ERR,
4157 "#blocks per group too big: %lu",
4158 sbi->s_blocks_per_group);
4159 goto failed_mount;
4160 }
4161 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4162 sbi->s_cluster_bits = 0;
ac27a0ec 4163 }
281b5995
TT		 4164 sbi->s_cluster_ratio = clustersize / blocksize;
4165
960fd856
TT		 4166 /* Do we have standard group size of clustersize * 8 blocks ? */
4167 if (sbi->s_blocks_per_group == clustersize << 3)
4168 set_opt2(sb, STD_GROUP_SIZE);
4169
bf43d84b
ES		 4170 /*
4171 * Test whether we have more sectors than will fit in sector_t,
4172 * and whether the max offset is addressable by the page cache.
4173 */
5a9ae68a 4174 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 4175 ext4_blocks_count(es));
5a9ae68a 4176 if (err) {
b31e1552 4177 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 4178 " too large to mount safely on this system");
ac27a0ec
DK		 4179 goto failed_mount;
4180 }
4181
617ba13b
MC		 4182 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4183 goto cantfind_ext4;
e7c95593 4184
0f2ddca6
FTN		 4185 /* check blocks count against device size */
4186 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4187 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 4188 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4189 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 4190 ext4_blocks_count(es), blocks_count);
4191 goto failed_mount;
4192 }
4193
0b8e58a1
AD		 4194 /*
4195 * It makes no sense for the first data block to be beyond the end
4196 * of the filesystem.
4197 */
4198 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 4199 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 4200 "block %u is beyond end of filesystem (%llu)",
4201 le32_to_cpu(es->s_first_data_block),
4202 ext4_blocks_count(es));
e7c95593
ES		 4203 goto failed_mount;
4204 }
bfe0a5f4
TT		 4205 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4206 (sbi->s_cluster_ratio == 1)) {
4207 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4208 "block is 0 with a 1k block and cluster size");
4209 goto failed_mount;
4210 }
4211
bd81d8ee
LV		 4212 blocks_count = (ext4_blocks_count(es) -
4213 le32_to_cpu(es->s_first_data_block) +
4214 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4215 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 4216 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 4217 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 4218 "(block count %llu, first data block %u, "
b31e1552 4219 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 4220 ext4_blocks_count(es),
4221 le32_to_cpu(es->s_first_data_block),
4222 EXT4_BLOCKS_PER_GROUP(sb));
4223 goto failed_mount;
4224 }
bd81d8ee 4225 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 4226 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4227 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
9e463084
TT		 4228 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4229 le32_to_cpu(es->s_inodes_count)) {
4230 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4231 le32_to_cpu(es->s_inodes_count),
4232 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4233 ret = -EINVAL;
4234 goto failed_mount;
4235 }
617ba13b
MC		 4236 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4237 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 4238 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 4239 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 4240 ext4_msg(sb, KERN_WARNING,
4241 "first meta block group too large: %u "
4242 "(group descriptor block count %u)",
4243 le32_to_cpu(es->s_first_meta_bg), db_count);
4244 goto failed_mount;
4245 }
4246 }
344476e1
KC		 4247 sbi->s_group_desc = kvmalloc_array(db_count,
4248 sizeof(struct buffer_head *),
4249 GFP_KERNEL);
ac27a0ec 4250 if (sbi->s_group_desc == NULL) {
b31e1552 4251 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4252 ret = -ENOMEM;
ac27a0ec
DK		 4253 goto failed_mount;
4254 }
4255
705895b6 4256 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4257
85c8f176
AP		 4258 /* Pre-read the descriptors into the buffer cache */
4259 for (i = 0; i < db_count; i++) {
4260 block = descriptor_loc(sb, logical_sb_block, i);
4261 sb_breadahead(sb, block);
4262 }
4263
ac27a0ec 4264 for (i = 0; i < db_count; i++) {
70bbb3e0 4265 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 4266 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 4267 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 4268 ext4_msg(sb, KERN_ERR,
4269 "can't read group descriptor %d", i);
ac27a0ec
DK		 4270 db_count = i;
4271 goto failed_mount2;
4272 }
4273 }
44de022c 4274 sbi->s_gdb_count = db_count;
829fa70d 4275 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4276 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4277 ret = -EFSCORRUPTED;
f9ae9cf5 4278 goto failed_mount2;
ac27a0ec 4279 }
772cb7c8 4280
235699a8 4281 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 4282
a75ae78f 4283 /* Register extent status tree shrinker */
eb68d0e2 4284 if (ext4_es_register_shrinker(sbi))
ce7e010a 4285 goto failed_mount3;
ce7e010a 4286
c9de560d 4287 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4288 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4289
f9ae9cf5
TT		 4290 /*
4291 * set up enough so that it can read an inode
4292 */
f6e63f90 4293 sb->s_op = &ext4_sops;
617ba13b
MC		 4294 sb->s_export_op = &ext4_export_ops;
4295 sb->s_xattr = ext4_xattr_handlers;
643fa961 4296#ifdef CONFIG_FS_ENCRYPTION
a7550b30 4297 sb->s_cop = &ext4_cryptops;
ffcc4182 4298#endif
c93d8f88
EB		 4299#ifdef CONFIG_FS_VERITY
4300 sb->s_vop = &ext4_verityops;
4301#endif
ac27a0ec 4302#ifdef CONFIG_QUOTA
617ba13b 4303 sb->dq_op = &ext4_quota_operations;
e2b911c5 4304 if (ext4_has_feature_quota(sb))
1fa5efe3 4305 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4306 else
4307 sb->s_qcop = &ext4_qctl_operations;
689c958c 4308 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4309#endif
85787090 4310 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4311
ac27a0ec 4312 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4313 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4314
4315 sb->s_root = NULL;
4316
4317 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4318 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4319
bc98a42c 4320 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4321 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4322 goto failed_mount3a;
c5e06d10 4323
ac27a0ec
DK		 4324 /*
4325 * The first inode we look at is the journal inode. Don't try
4326 * root first: it may be modified in the journal!
4327 */
e2b911c5 4328 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4329 err = ext4_load_journal(sb, es, journal_devnum);
4330 if (err)
50460fe8 4331 goto failed_mount3a;
bc98a42c 4332 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4333 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4334 ext4_msg(sb, KERN_ERR, "required journal recovery "
4335 "suppressed and not mounted read-only");
744692dc 4336 goto failed_mount_wq;
ac27a0ec 4337 } else {
1e381f60
DM		 4338 /* Nojournal mode, all journal mount options are illegal */
4339 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4340 ext4_msg(sb, KERN_ERR, "can't mount with "
4341 "journal_checksum, fs mounted w/o journal");
4342 goto failed_mount_wq;
4343 }
4344 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4345 ext4_msg(sb, KERN_ERR, "can't mount with "
4346 "journal_async_commit, fs mounted w/o journal");
4347 goto failed_mount_wq;
4348 }
4349 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4350 ext4_msg(sb, KERN_ERR, "can't mount with "
4351 "commit=%lu, fs mounted w/o journal",
4352 sbi->s_commit_interval / HZ);
4353 goto failed_mount_wq;
4354 }
4355 if (EXT4_MOUNT_DATA_FLAGS &
4356 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4357 ext4_msg(sb, KERN_ERR, "can't mount with "
4358 "data=, fs mounted w/o journal");
4359 goto failed_mount_wq;
4360 }
50b29d8f 4361 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
1e381f60 4362 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4363 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4364 sbi->s_journal = NULL;
4365 needs_recovery = 0;
4366 goto no_journal;
ac27a0ec
DK		 4367 }
4368
e2b911c5 4369 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4370 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4371 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4372 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4373 goto failed_mount_wq;
eb40a09c
JS		 4374 }
4375
25ed6e8a
DW		 4376 if (!set_journal_csum_feature_set(sb)) {
4377 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4378 "feature set");
4379 goto failed_mount_wq;
d4da6c9c 4380 }
818d276c 4381
ac27a0ec
DK		 4382 /* We have now updated the journal if required, so we can
4383 * validate the data journaling mode. */
4384 switch (test_opt(sb, DATA_FLAGS)) {
4385 case 0:
4386 /* No mode set, assume a default based on the journal
63f57933
AM		 4387 * capabilities: ORDERED_DATA if the journal can
4388 * cope, else JOURNAL_DATA
4389 */
dab291af 4390 if (jbd2_journal_check_available_features
27f394a7 4391 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
fd8c37ec 4392 set_opt(sb, ORDERED_DATA);
27f394a7
TN		 4393 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4394 } else {
fd8c37ec 4395 set_opt(sb, JOURNAL_DATA);
27f394a7
TN		 4396 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4397 }
ac27a0ec
DK		 4398 break;
4399
617ba13b
MC		 4400 case EXT4_MOUNT_ORDERED_DATA:
4401 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4402 if (!jbd2_journal_check_available_features
4403 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4404 ext4_msg(sb, KERN_ERR, "Journal does not support "
4405 "requested data journaling mode");
744692dc 4406 goto failed_mount_wq;
ac27a0ec
DK		 4407 }
4408 default:
4409 break;
4410 }
ab04df78
JK		 4411
4412 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4413 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4414 ext4_msg(sb, KERN_ERR, "can't mount with "
4415 "journal_async_commit in data=ordered mode");
4416 goto failed_mount_wq;
4417 }
4418
b3881f74 4419 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4420
18aadd47
BJ		 4421 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4422
ce7e010a 4423no_journal:
cdb7ee4c
TE		 4424 if (!test_opt(sb, NO_MBCACHE)) {
4425 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4426 if (!sbi->s_ea_block_cache) {
dec214d0 4427 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4428 "Failed to create ea_block_cache");
dec214d0
TE		 4429 goto failed_mount_wq;
4430 }
cdb7ee4c
TE		 4431
4432 if (ext4_has_feature_ea_inode(sb)) {
4433 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4434 if (!sbi->s_ea_inode_cache) {
4435 ext4_msg(sb, KERN_ERR,
4436 "Failed to create ea_inode_cache");
4437 goto failed_mount_wq;
4438 }
4439 }
9c191f70
M		 4440 }
4441
e2b911c5 4442 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 4443 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 4444 ext4_msg(sb, KERN_ERR,
4445 "Unsupported blocksize for fs encryption");
4446 goto failed_mount_wq;
4447 }
4448
c93d8f88
EB		 4449 if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4450 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4451 goto failed_mount_wq;
4452 }
4453
bc98a42c 4454 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4455 !ext4_has_feature_encrypt(sb)) {
4456 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4457 ext4_commit_super(sb, 1);
4458 }
4459
952fc18e
TT		 4460 /*
4461 * Get the # of file system overhead blocks from the
4462 * superblock if present.
4463 */
4464 if (es->s_overhead_clusters)
4465 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4466 else {
07aa2ea1
LC		 4467 err = ext4_calculate_overhead(sb);
4468 if (err)
952fc18e
TT		 4469 goto failed_mount_wq;
4470 }
4471
fd89d5f2
TH		 4472 /*
4473 * The maximum number of concurrent works can be high and
4474 * concurrency isn't really necessary. Limit it to 1.
4475 */
2e8fa54e
JK		 4476 EXT4_SB(sb)->rsv_conversion_wq =
4477 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4478 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4479 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4480 ret = -ENOMEM;
2e8fa54e
JK		 4481 goto failed_mount4;
4482 }
4483
ac27a0ec 4484 /*
dab291af 4485 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4486 * so we can safely mount the rest of the filesystem now.
4487 */
4488
8a363970 4489 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 4490 if (IS_ERR(root)) {
b31e1552 4491 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4492 ret = PTR_ERR(root);
32a9bb57 4493 root = NULL;
ac27a0ec
DK		 4494 goto failed_mount4;
4495 }
4496 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4497 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4498 iput(root);
ac27a0ec
DK		 4499 goto failed_mount4;
4500 }
b886ee3e
GKB		 4501
4502#ifdef CONFIG_UNICODE
4503 if (sbi->s_encoding)
4504 sb->s_d_op = &ext4_dentry_ops;
4505#endif
4506
48fde701 4507 sb->s_root = d_make_root(root);
1d1fe1ee 4508 if (!sb->s_root) {
b31e1552 4509 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4510 ret = -ENOMEM;
4511 goto failed_mount4;
4512 }
ac27a0ec 4513
c89128a0
JK		 4514 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4515 if (ret == -EROFS) {
1751e8a6 4516 sb->s_flags |= SB_RDONLY;
c89128a0
JK		 4517 ret = 0;
4518 } else if (ret)
4519 goto failed_mount4a;
ef7f3835 4520
7bc04c5c 4521 ext4_clamp_want_extra_isize(sb);
ef7f3835 4522
b5799018 4523 ext4_set_resv_clusters(sb);
27dd4385 4524
6fd058f7
TT		 4525 err = ext4_setup_system_zone(sb);
4526 if (err) {
b31e1552 4527 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4528 "zone (%d)", err);
f9ae9cf5
TT		 4529 goto failed_mount4a;
4530 }
4531
4532 ext4_ext_init(sb);
4533 err = ext4_mb_init(sb);
4534 if (err) {
4535 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4536 err);
dcf2d804 4537 goto failed_mount5;
c2774d84
AK		 4538 }
4539
d5e03cbb
TT		 4540 block = ext4_count_free_clusters(sb);
4541 ext4_free_blocks_count_set(sbi->s_es,
4542 EXT4_C2B(sbi, block));
4274f516 4543 ext4_superblock_csum_set(sb);
908c7f19
TH		 4544 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4545 GFP_KERNEL);
d5e03cbb
TT		 4546 if (!err) {
4547 unsigned long freei = ext4_count_free_inodes(sb);
4548 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4274f516 4549 ext4_superblock_csum_set(sb);
908c7f19
TH		 4550 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4551 GFP_KERNEL);
d5e03cbb
TT		 4552 }
4553 if (!err)
4554 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4555 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4556 if (!err)
908c7f19
TH		 4557 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4558 GFP_KERNEL);
c8585c6f
DJ		 4559 if (!err)
4560 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4561
d5e03cbb
TT		 4562 if (err) {
4563 ext4_msg(sb, KERN_ERR, "insufficient memory");
4564 goto failed_mount6;
4565 }
4566
e2b911c5 4567 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4568 if (!ext4_fill_flex_info(sb)) {
4569 ext4_msg(sb, KERN_ERR,
4570 "unable to initialize "
4571 "flex_bg meta info!");
4572 goto failed_mount6;
4573 }
4574
bfff6873
LC		 4575 err = ext4_register_li_request(sb, first_not_zeroed);
4576 if (err)
dcf2d804 4577 goto failed_mount6;
bfff6873 4578
b5799018 4579 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4580 if (err)
4581 goto failed_mount7;
3197ebdb 4582
9b2ff357
JK		 4583#ifdef CONFIG_QUOTA
4584 /* Enable quota usage during mount. */
bc98a42c 4585 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4586 err = ext4_enable_quotas(sb);
4587 if (err)
4588 goto failed_mount8;
4589 }
4590#endif /* CONFIG_QUOTA */
4591
617ba13b
MC		 4592 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4593 ext4_orphan_cleanup(sb, es);
4594 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4595 if (needs_recovery) {
b31e1552 4596 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4597 ext4_mark_recovery_complete(sb, es);
4598 }
4599 if (EXT4_SB(sb)->s_journal) {
4600 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4601 descr = " journalled data mode";
4602 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4603 descr = " ordered data mode";
4604 else
4605 descr = " writeback data mode";
4606 } else
4607 descr = "out journal";
4608
79add3a3
LC		 4609 if (test_opt(sb, DISCARD)) {
4610 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4611 if (!blk_queue_discard(q))
4612 ext4_msg(sb, KERN_WARNING,
4613 "mounting with \"discard\" option, but "
4614 "the device does not support discard");
4615 }
4616
e294a537
TT		 4617 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4618 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4619 "Opts: %.*s%s%s", descr,
4620 (int) sizeof(sbi->s_es->s_mount_opts),
4621 sbi->s_es->s_mount_opts,
e294a537 4622 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4623
66e61a9e
TT		 4624 if (es->s_error_count)
4625 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4626
efbed4dc
TT		 4627 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4628 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4629 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4630 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4631
d4c402d9 4632 kfree(orig_data);
ac27a0ec
DK		 4633 return 0;
4634
617ba13b 4635cantfind_ext4:
ac27a0ec 4636 if (!silent)
b31e1552 4637 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4638 goto failed_mount;
4639
72ba7450
TT		 4640#ifdef CONFIG_QUOTA
4641failed_mount8:
ebd173be 4642 ext4_unregister_sysfs(sb);
72ba7450 4643#endif
dcf2d804
TM		 4644failed_mount7:
4645 ext4_unregister_li_request(sb);
4646failed_mount6:
f9ae9cf5 4647 ext4_mb_release(sb);
d5e03cbb 4648 if (sbi->s_flex_groups)
b93b41d4 4649 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4650 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4651 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4652 percpu_counter_destroy(&sbi->s_dirs_counter);
4653 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
af18e35b 4654 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
00764937 4655failed_mount5:
f9ae9cf5
TT		 4656 ext4_ext_release(sb);
4657 ext4_release_system_zone(sb);
4658failed_mount4a:
94bf608a 4659 dput(sb->s_root);
32a9bb57 4660 sb->s_root = NULL;
94bf608a 4661failed_mount4:
b31e1552 4662 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4663 if (EXT4_SB(sb)->rsv_conversion_wq)
4664 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4665failed_mount_wq:
50c15df6
CX		 4666 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4667 sbi->s_ea_inode_cache = NULL;
4668
4669 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4670 sbi->s_ea_block_cache = NULL;
4671
0390131b
FM		 4672 if (sbi->s_journal) {
4673 jbd2_journal_destroy(sbi->s_journal);
4674 sbi->s_journal = NULL;
4675 }
50460fe8 4676failed_mount3a:
d3922a77 4677 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4678failed_mount3:
9105bb14 4679 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4680 if (sbi->s_mmp_tsk)
4681 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4682failed_mount2:
4683 for (i = 0; i < db_count; i++)
4684 brelse(sbi->s_group_desc[i]);
b93b41d4 4685 kvfree(sbi->s_group_desc);
ac27a0ec 4686failed_mount:
0441984a
DW		 4687 if (sbi->s_chksum_driver)
4688 crypto_free_shash(sbi->s_chksum_driver);
c83ad55e
GKB		 4689
4690#ifdef CONFIG_UNICODE
4691 utf8_unload(sbi->s_encoding);
4692#endif
4693
ac27a0ec 4694#ifdef CONFIG_QUOTA
a2d4a646 4695 for (i = 0; i < EXT4_MAXQUOTAS; i++)
0ba33fac 4696 kfree(get_qf_name(sb, sbi, i));
ac27a0ec 4697#endif
617ba13b 4698 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4699 brelse(bh);
4700out_fail:
4701 sb->s_fs_info = NULL;
f6830165 4702 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4703out_free_base:
ac27a0ec 4704 kfree(sbi);
d4c402d9 4705 kfree(orig_data);
5e405595 4706 fs_put_dax(dax_dev);
07aa2ea1 4707 return err ? err : ret;
ac27a0ec
DK		 4708}
4709
4710/*
4711 * Setup any per-fs journal parameters now. We'll do this both on
4712 * initial mount, once the journal has been initialised but before we've
4713 * done any recovery; and again on any subsequent remount.
4714 */
617ba13b 4715static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4716{
617ba13b 4717 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4718
30773840
TT		 4719 journal->j_commit_interval = sbi->s_commit_interval;
4720 journal->j_min_batch_time = sbi->s_min_batch_time;
4721 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4722
a931da6a 4723 write_lock(&journal->j_state_lock);
ac27a0ec 4724 if (test_opt(sb, BARRIER))
dab291af 4725 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4726 else
dab291af 4727 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4728 if (test_opt(sb, DATA_ERR_ABORT))
4729 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4730 else
4731 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4732 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4733}
4734
c6cb7e77
EW		 4735static struct inode *ext4_get_journal_inode(struct super_block *sb,
4736 unsigned int journal_inum)
ac27a0ec
DK		 4737{
4738 struct inode *journal_inode;
ac27a0ec 4739
c6cb7e77
EW		 4740 /*
4741 * Test for the existence of a valid inode on disk. Bad things
4742 * happen if we iget() an unused inode, as the subsequent iput()
4743 * will try to delete it.
4744 */
8a363970 4745 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 4746 if (IS_ERR(journal_inode)) {
b31e1552 4747 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4748 return NULL;
4749 }
4750 if (!journal_inode->i_nlink) {
4751 make_bad_inode(journal_inode);
4752 iput(journal_inode);
b31e1552 4753 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4754 return NULL;
4755 }
4756
e5f8eab8 4757 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4758 journal_inode, journal_inode->i_size);
1d1fe1ee 4759 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4760 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4761 iput(journal_inode);
4762 return NULL;
4763 }
c6cb7e77
EW		 4764 return journal_inode;
4765}
4766
4767static journal_t *ext4_get_journal(struct super_block *sb,
4768 unsigned int journal_inum)
4769{
4770 struct inode *journal_inode;
4771 journal_t *journal;
4772
4773 BUG_ON(!ext4_has_feature_journal(sb));
4774
4775 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4776 if (!journal_inode)
4777 return NULL;
ac27a0ec 4778
dab291af 4779 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4780 if (!journal) {
b31e1552 4781 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4782 iput(journal_inode);
4783 return NULL;
4784 }
4785 journal->j_private = sb;
617ba13b 4786 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4787 return journal;
4788}
4789
617ba13b 4790static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4791 dev_t j_dev)
4792{
2b2d6d01 4793 struct buffer_head *bh;
ac27a0ec 4794 journal_t *journal;
617ba13b
MC		 4795 ext4_fsblk_t start;
4796 ext4_fsblk_t len;
ac27a0ec 4797 int hblock, blocksize;
617ba13b 4798 ext4_fsblk_t sb_block;
ac27a0ec 4799 unsigned long offset;
2b2d6d01 4800 struct ext4_super_block *es;
ac27a0ec
DK		 4801 struct block_device *bdev;
4802
e2b911c5 4803 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4804
b31e1552 4805 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4806 if (bdev == NULL)
4807 return NULL;
4808
ac27a0ec 4809 blocksize = sb->s_blocksize;
e1defc4f 4810 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4811 if (blocksize < hblock) {
b31e1552
ES		 4812 ext4_msg(sb, KERN_ERR,
4813 "blocksize too small for journal device");
ac27a0ec
DK		 4814 goto out_bdev;
4815 }
4816
617ba13b
MC		 4817 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4818 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4819 set_blocksize(bdev, blocksize);
4820 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4821 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4822 "external journal");
ac27a0ec
DK		 4823 goto out_bdev;
4824 }
4825
2716b802 4826 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4827 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4828 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4829 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4830 ext4_msg(sb, KERN_ERR, "external journal has "
4831 "bad superblock");
ac27a0ec
DK		 4832 brelse(bh);
4833 goto out_bdev;
4834 }
4835
df4763be
DW		 4836 if ((le32_to_cpu(es->s_feature_ro_compat) &
4837 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4838 es->s_checksum != ext4_superblock_csum(sb, es)) {
4839 ext4_msg(sb, KERN_ERR, "external journal has "
4840 "corrupt superblock");
4841 brelse(bh);
4842 goto out_bdev;
4843 }
4844
617ba13b 4845 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4846 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4847 brelse(bh);
4848 goto out_bdev;
4849 }
4850
bd81d8ee 4851 len = ext4_blocks_count(es);
ac27a0ec
DK		 4852 start = sb_block + 1;
4853 brelse(bh); /* we're done with the superblock */
4854
dab291af 4855 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4856 start, len, blocksize);
4857 if (!journal) {
b31e1552 4858 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4859 goto out_bdev;
4860 }
4861 journal->j_private = sb;
dfec8a14 4862 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4863 wait_on_buffer(journal->j_sb_buffer);
4864 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4865 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4866 goto out_journal;
4867 }
4868 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4869 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4870 "user (unsupported) - %d",
ac27a0ec
DK		 4871 be32_to_cpu(journal->j_superblock->s_nr_users));
4872 goto out_journal;
4873 }
617ba13b
MC		 4874 EXT4_SB(sb)->journal_bdev = bdev;
4875 ext4_init_journal_params(sb, journal);
ac27a0ec 4876 return journal;
0b8e58a1 4877
ac27a0ec 4878out_journal:
dab291af 4879 jbd2_journal_destroy(journal);
ac27a0ec 4880out_bdev:
617ba13b 4881 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4882 return NULL;
4883}
4884
617ba13b
MC		 4885static int ext4_load_journal(struct super_block *sb,
4886 struct ext4_super_block *es,
ac27a0ec
DK		 4887 unsigned long journal_devnum)
4888{
4889 journal_t *journal;
4890 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4891 dev_t journal_dev;
4892 int err = 0;
4893 int really_read_only;
4894
e2b911c5 4895 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4896
ac27a0ec
DK		 4897 if (journal_devnum &&
4898 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4899 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4900 "numbers have changed");
ac27a0ec
DK		 4901 journal_dev = new_decode_dev(journal_devnum);
4902 } else
4903 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4904
4905 really_read_only = bdev_read_only(sb->s_bdev);
4906
4907 /*
4908 * Are we loading a blank journal or performing recovery after a
4909 * crash? For recovery, we need to check in advance whether we
4910 * can get read-write access to the device.
4911 */
e2b911c5 4912 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 4913 if (sb_rdonly(sb)) {
b31e1552
ES		 4914 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4915 "required on readonly filesystem");
ac27a0ec 4916 if (really_read_only) {
b31e1552 4917 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 4918 "unavailable, cannot proceed "
4919 "(try mounting with noload)");
ac27a0ec
DK		 4920 return -EROFS;
4921 }
b31e1552
ES		 4922 ext4_msg(sb, KERN_INFO, "write access will "
4923 "be enabled during recovery");
ac27a0ec
DK		 4924 }
4925 }
4926
4927 if (journal_inum && journal_dev) {
b31e1552
ES		 4928 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4929 "and inode journals!");
ac27a0ec
DK		 4930 return -EINVAL;
4931 }
4932
4933 if (journal_inum) {
617ba13b 4934 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4935 return -EINVAL;
4936 } else {
617ba13b 4937 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4938 return -EINVAL;
4939 }
4940
90576c0b 4941 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4942 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4943
e2b911c5 4944 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4945 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4946 if (!err) {
4947 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4948 if (save)
4949 memcpy(save, ((char *) es) +
4950 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4951 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4952 if (save)
4953 memcpy(((char *) es) + EXT4_S_ERR_START,
4954 save, EXT4_S_ERR_LEN);
4955 kfree(save);
4956 }
ac27a0ec
DK		 4957
4958 if (err) {
b31e1552 4959 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4960 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4961 return err;
4962 }
4963
617ba13b
MC		 4964 EXT4_SB(sb)->s_journal = journal;
4965 ext4_clear_journal_err(sb, es);
ac27a0ec 4966
c41303ce 4967 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4968 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4969 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4970
4971 /* Make sure we flush the recovery flag to disk. */
e2d67052 4972 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4973 }
4974
4975 return 0;
4976}
4977
e2d67052 4978static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4979{
e2d67052 4980 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4981 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4982 int error = 0;
ac27a0ec 4983
bdfe0cbd 4984 if (!sbh || block_device_ejected(sb))
c4be0c1d 4985 return error;
a17712c8
JD		 4986
4987 /*
4988 * The superblock bh should be mapped, but it might not be if the
4989 * device was hot-removed. Not much we can do but fail the I/O.
4990 */
4991 if (!buffer_mapped(sbh))
4992 return error;
4993
71290b36
TT		 4994 /*
4995 * If the file system is mounted read-only, don't update the
4996 * superblock write time. This avoids updating the superblock
4997 * write time when we are mounting the root file system
4998 * read/only but we need to replay the journal; at that point,
4999 * for people who are east of GMT and who make their clock
5000 * tick in localtime for Windows bug-for-bug compatibility,
5001 * the clock is set in the future, and this will cause e2fsck
5002 * to complain and force a full file system check.
5003 */
1751e8a6 5004 if (!(sb->s_flags & SB_RDONLY))
6a0678a7 5005 ext4_update_tstamp(es, s_wtime);
f613dfcb
TT		 5006 if (sb->s_bdev->bd_part)
5007 es->s_kbytes_written =
5008 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
dbae2c55
MC		 5009 ((part_stat_read(sb->s_bdev->bd_part,
5010 sectors[STAT_WRITE]) -
afc32f7e 5011 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 5012 else
5013 es->s_kbytes_written =
5014 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 5015 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5016 ext4_free_blocks_count_set(es,
57042651
TT		 5017 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5018 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 5019 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5020 es->s_free_inodes_count =
5021 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 5022 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 5023 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 5024 ext4_superblock_csum_set(sb);
1566a48a
TT		 5025 if (sync)
5026 lock_buffer(sbh);
e8680786 5027 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 5028 /*
5029 * Oh, dear. A previous attempt to write the
5030 * superblock failed. This could happen because the
5031 * USB device was yanked out. Or it could happen to
5032 * be a transient write error and maybe the block will
5033 * be remapped. Nothing we can do but to retry the
5034 * write and hope for the best.
5035 */
5036 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5037 "superblock detected");
5038 clear_buffer_write_io_error(sbh);
5039 set_buffer_uptodate(sbh);
5040 }
ac27a0ec 5041 mark_buffer_dirty(sbh);
914258bf 5042 if (sync) {
1566a48a 5043 unlock_buffer(sbh);
564bc402 5044 error = __sync_dirty_buffer(sbh,
00473374 5045 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c89128a0 5046 if (buffer_write_io_error(sbh)) {
b31e1552
ES		 5047 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5048 "superblock");
914258bf
TT		 5049 clear_buffer_write_io_error(sbh);
5050 set_buffer_uptodate(sbh);
5051 }
5052 }
c4be0c1d 5053 return error;
ac27a0ec
DK		 5054}
5055
ac27a0ec
DK		 5056/*
5057 * Have we just finished recovery? If so, and if we are mounting (or
5058 * remounting) the filesystem readonly, then we will end up with a
5059 * consistent fs on disk. Record that fact.
5060 */
2b2d6d01
TT		 5061static void ext4_mark_recovery_complete(struct super_block *sb,
5062 struct ext4_super_block *es)
ac27a0ec 5063{
617ba13b 5064 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 5065
e2b911c5 5066 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 5067 BUG_ON(journal != NULL);
5068 return;
5069 }
dab291af 5070 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 5071 if (jbd2_journal_flush(journal) < 0)
5072 goto out;
5073
bc98a42c 5074 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 5075 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 5076 ext4_commit_super(sb, 1);
ac27a0ec 5077 }
7ffe1ea8
HK		 5078
5079out:
dab291af 5080 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 5081}
5082
5083/*
5084 * If we are mounting (or read-write remounting) a filesystem whose journal
5085 * has recorded an error from a previous lifetime, move that error to the
5086 * main filesystem now.
5087 */
2b2d6d01
TT		 5088static void ext4_clear_journal_err(struct super_block *sb,
5089 struct ext4_super_block *es)
ac27a0ec
DK		 5090{
5091 journal_t *journal;
5092 int j_errno;
5093 const char *errstr;
5094
e2b911c5 5095 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 5096
617ba13b 5097 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 5098
5099 /*
5100 * Now check for any error status which may have been recorded in the
617ba13b 5101 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 5102 */
5103
dab291af 5104 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 5105 if (j_errno) {
5106 char nbuf[16];
5107
617ba13b 5108 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 5109 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 5110 "from previous mount: %s", errstr);
12062ddd 5111 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 5112
617ba13b
MC		 5113 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5114 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 5115 ext4_commit_super(sb, 1);
ac27a0ec 5116
dab291af 5117 jbd2_journal_clear_err(journal);
d796c52e 5118 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 5119 }
5120}
5121
5122/*
5123 * Force the running and committing transactions to commit,
5124 * and wait on the commit.
5125 */
617ba13b 5126int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 5127{
5128 journal_t *journal;
ac27a0ec 5129
bc98a42c 5130 if (sb_rdonly(sb))
ac27a0ec
DK		 5131 return 0;
5132
617ba13b 5133 journal = EXT4_SB(sb)->s_journal;
b1deefc9 5134 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 5135}
5136
617ba13b 5137static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 5138{
14ce0cb4 5139 int ret = 0;
9eddacf9 5140 tid_t target;
06a407f1 5141 bool needs_barrier = false;
8d5d02e6 5142 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5143
49598e04 5144 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 5145 return 0;
5146
9bffad1e 5147 trace_ext4_sync_fs(sb, wait);
2e8fa54e 5148 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 5149 /*
5150 * Writeback quota in non-journalled quota case - journalled quota has
5151 * no dirty dquots
5152 */
5153 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 5154 /*
5155 * Data writeback is possible w/o journal transaction, so barrier must
5156 * being sent at the end of the function. But we can skip it if
5157 * transaction_commit will do it for us.
5158 */
bda32530
TT		 5159 if (sbi->s_journal) {
5160 target = jbd2_get_latest_transaction(sbi->s_journal);
5161 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5162 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5163 needs_barrier = true;
5164
5165 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5166 if (wait)
5167 ret = jbd2_log_wait_commit(sbi->s_journal,
5168 target);
5169 }
5170 } else if (wait && test_opt(sb, BARRIER))
06a407f1 5171 needs_barrier = true;
06a407f1
DM		 5172 if (needs_barrier) {
5173 int err;
5174 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5175 if (!ret)
5176 ret = err;
0390131b 5177 }
06a407f1
DM		 5178
5179 return ret;
5180}
5181
ac27a0ec
DK		 5182/*
5183 * LVM calls this function before a (read-only) snapshot is created. This
5184 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 5185 *
5186 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 5187 * state independently. It relies on upper layer to stop all data & metadata
5188 * modifications.
ac27a0ec 5189 */
c4be0c1d 5190static int ext4_freeze(struct super_block *sb)
ac27a0ec 5191{
c4be0c1d
TS		 5192 int error = 0;
5193 journal_t *journal;
ac27a0ec 5194
bc98a42c 5195 if (sb_rdonly(sb))
9ca92389 5196 return 0;
ac27a0ec 5197
9ca92389 5198 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 5199
bb044576
TT		 5200 if (journal) {
5201 /* Now we set up the journal barrier. */
5202 jbd2_journal_lock_updates(journal);
ac27a0ec 5203
bb044576
TT		 5204 /*
5205 * Don't clear the needs_recovery flag if we failed to
5206 * flush the journal.
5207 */
5208 error = jbd2_journal_flush(journal);
5209 if (error < 0)
5210 goto out;
c642dc9e
ES		 5211
5212 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 5213 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 5214 }
9ca92389 5215
9ca92389 5216 error = ext4_commit_super(sb, 1);
6b0310fb 5217out:
bb044576
TT		 5218 if (journal)
5219 /* we rely on upper layer to stop further updates */
5220 jbd2_journal_unlock_updates(journal);
6b0310fb 5221 return error;
ac27a0ec
DK		 5222}
5223
5224/*
5225 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5226 * flag here, even though the filesystem is not technically dirty yet.
5227 */
c4be0c1d 5228static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 5229{
bc98a42c 5230 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 5231 return 0;
5232
c642dc9e
ES		 5233 if (EXT4_SB(sb)->s_journal) {
5234 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 5235 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 5236 }
5237
9ca92389 5238 ext4_commit_super(sb, 1);
c4be0c1d 5239 return 0;
ac27a0ec
DK		 5240}
5241
673c6100
TT		 5242/*
5243 * Structure to save mount options for ext4_remount's benefit
5244 */
5245struct ext4_mount_options {
5246 unsigned long s_mount_opt;
a2595b8a 5247 unsigned long s_mount_opt2;
08cefc7a
EB		 5248 kuid_t s_resuid;
5249 kgid_t s_resgid;
673c6100
TT		 5250 unsigned long s_commit_interval;
5251 u32 s_min_batch_time, s_max_batch_time;
5252#ifdef CONFIG_QUOTA
5253 int s_jquota_fmt;
a2d4a646 5254 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 5255#endif
5256};
5257
2b2d6d01 5258static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5259{
2b2d6d01 5260 struct ext4_super_block *es;
617ba13b 5261 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5262 unsigned long old_sb_flags;
617ba13b 5263 struct ext4_mount_options old_opts;
c79d967d 5264 int enable_quota = 0;
8a266467 5265 ext4_group_t g;
b3881f74 5266 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5267 int err = 0;
ac27a0ec 5268#ifdef CONFIG_QUOTA
03dafb5f 5269 int i, j;
33458eab 5270 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec 5271#endif
d4c402d9 5272 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec 5273
21ac738e
CX		 5274 if (data && !orig_data)
5275 return -ENOMEM;
5276
ac27a0ec
DK		 5277 /* Store the original options */
5278 old_sb_flags = sb->s_flags;
5279 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5280 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5281 old_opts.s_resuid = sbi->s_resuid;
5282 old_opts.s_resgid = sbi->s_resgid;
5283 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5284 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5285 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5286#ifdef CONFIG_QUOTA
5287 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5288 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5289 if (sbi->s_qf_names[i]) {
33458eab
TT		 5290 char *qf_name = get_qf_name(sb, sbi, i);
5291
5292 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 5293 if (!old_opts.s_qf_names[i]) {
5294 for (j = 0; j < i; j++)
5295 kfree(old_opts.s_qf_names[j]);
3e36a163 5296 kfree(orig_data);
03dafb5f
CG		 5297 return -ENOMEM;
5298 }
5299 } else
5300 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5301#endif
b3881f74
TT		 5302 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5303 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5304
661aa520 5305 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5306 err = -EINVAL;
5307 goto restore_opts;
5308 }
5309
7bc04c5c
BR		 5310 ext4_clamp_want_extra_isize(sb);
5311
6b992ff2 5312 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5313 test_opt(sb, JOURNAL_CHECKSUM)) {
5314 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5315 "during remount not supported; ignoring");
5316 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5317 }
5318
6ae6514b
PS		 5319 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5320 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5321 ext4_msg(sb, KERN_ERR, "can't mount with "
5322 "both data=journal and delalloc");
5323 err = -EINVAL;
5324 goto restore_opts;
5325 }
5326 if (test_opt(sb, DIOREAD_NOLOCK)) {
5327 ext4_msg(sb, KERN_ERR, "can't mount with "
5328 "both data=journal and dioread_nolock");
5329 err = -EINVAL;
5330 goto restore_opts;
5331 }
923ae0ff
RZ		 5332 if (test_opt(sb, DAX)) {
5333 ext4_msg(sb, KERN_ERR, "can't mount with "
5334 "both data=journal and dax");
5335 err = -EINVAL;
5336 goto restore_opts;
5337 }
ab04df78
JK		 5338 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5339 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5340 ext4_msg(sb, KERN_ERR, "can't mount with "
5341 "journal_async_commit in data=ordered mode");
5342 err = -EINVAL;
5343 goto restore_opts;
5344 }
923ae0ff
RZ		 5345 }
5346
cdb7ee4c
TE		 5347 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5348 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5349 err = -EINVAL;
5350 goto restore_opts;
5351 }
5352
923ae0ff
RZ		 5353 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5354 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5355 "dax flag with busy inodes while remounting");
5356 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 5357 }
5358
4ab2f15b 5359 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 5360 ext4_abort(sb, "Abort forced by user");
ac27a0ec 5361
1751e8a6
LT		 5362 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5363 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5364
5365 es = sbi->s_es;
5366
b3881f74 5367 if (sbi->s_journal) {
0390131b 5368 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5369 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5370 }
ac27a0ec 5371
1751e8a6
LT		 5372 if (*flags & SB_LAZYTIME)
5373 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5374
1751e8a6 5375 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5376 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5377 err = -EROFS;
5378 goto restore_opts;
5379 }
5380
1751e8a6 5381 if (*flags & SB_RDONLY) {
38c03b34
TT		 5382 err = sync_filesystem(sb);
5383 if (err < 0)
5384 goto restore_opts;
0f0dd62f
CH		 5385 err = dquot_suspend(sb, -1);
5386 if (err < 0)
c79d967d 5387 goto restore_opts;
c79d967d 5388
ac27a0ec
DK		 5389 /*
5390 * First of all, the unconditional stuff we have to do
5391 * to disable replay of the journal when we next remount
5392 */
1751e8a6 5393 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5394
5395 /*
5396 * OK, test if we are remounting a valid rw partition
5397 * readonly, and if so set the rdonly flag and then
5398 * mark the partition as valid again.
5399 */
617ba13b
MC		 5400 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5401 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5402 es->s_state = cpu_to_le16(sbi->s_mount_state);
5403
a63c9eb2 5404 if (sbi->s_journal)
0390131b 5405 ext4_mark_recovery_complete(sb, es);
2dca60d9
TT		 5406 if (sbi->s_mmp_tsk)
5407 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5408 } else {
a13fb1a4 5409 /* Make sure we can mount this feature set readwrite */
e2b911c5 5410 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5411 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5412 err = -EROFS;
5413 goto restore_opts;
5414 }
8a266467
TT		 5415 /*
5416 * Make sure the group descriptor checksums
0b8e58a1 5417 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5418 */
5419 for (g = 0; g < sbi->s_groups_count; g++) {
5420 struct ext4_group_desc *gdp =
5421 ext4_get_group_desc(sb, g, NULL);
5422
feb0ab32 5423 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5424 ext4_msg(sb, KERN_ERR,
5425 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5426 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5427 le16_to_cpu(gdp->bg_checksum));
6a797d27 5428 err = -EFSBADCRC;
8a266467
TT		 5429 goto restore_opts;
5430 }
5431 }
5432
ead6596b
ES		 5433 /*
5434 * If we have an unprocessed orphan list hanging
5435 * around from a previously readonly bdev mount,
5436 * require a full umount/remount for now.
5437 */
5438 if (es->s_last_orphan) {
b31e1552 5439 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5440 "remount RDWR because of unprocessed "
5441 "orphan inode list. Please "
b31e1552 5442 "umount/remount instead");
ead6596b
ES		 5443 err = -EINVAL;
5444 goto restore_opts;
5445 }
5446
ac27a0ec
DK		 5447 /*
5448 * Mounting a RDONLY partition read-write, so reread
5449 * and store the current valid flag. (It may have
5450 * been changed by e2fsck since we originally mounted
5451 * the partition.)
5452 */
0390131b
FM		 5453 if (sbi->s_journal)
5454 ext4_clear_journal_err(sb, es);
ac27a0ec 5455 sbi->s_mount_state = le16_to_cpu(es->s_state);
c89128a0
JK		 5456
5457 err = ext4_setup_super(sb, es, 0);
5458 if (err)
5459 goto restore_opts;
5460
5461 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5462 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5463 if (ext4_multi_mount_protect(sb,
5464 le64_to_cpu(es->s_mmp_block))) {
5465 err = -EROFS;
5466 goto restore_opts;
5467 }
c79d967d 5468 enable_quota = 1;
ac27a0ec
DK		 5469 }
5470 }
bfff6873
LC		 5471
5472 /*
5473 * Reinitialize lazy itable initialization thread based on
5474 * current settings
5475 */
bc98a42c 5476 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5477 ext4_unregister_li_request(sb);
5478 else {
5479 ext4_group_t first_not_zeroed;
5480 first_not_zeroed = ext4_has_uninit_itable(sb);
5481 ext4_register_li_request(sb, first_not_zeroed);
5482 }
5483
6fd058f7 5484 ext4_setup_system_zone(sb);
c89128a0
JK		 5485 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5486 err = ext4_commit_super(sb, 1);
5487 if (err)
5488 goto restore_opts;
5489 }
0390131b 5490
ac27a0ec
DK		 5491#ifdef CONFIG_QUOTA
5492 /* Release old quota file names */
a2d4a646 5493 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5494 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5495 if (enable_quota) {
5496 if (sb_any_quota_suspended(sb))
5497 dquot_resume(sb, -1);
e2b911c5 5498 else if (ext4_has_feature_quota(sb)) {
7c319d32 5499 err = ext4_enable_quotas(sb);
07724f98 5500 if (err)
7c319d32 5501 goto restore_opts;
7c319d32
AK		 5502 }
5503 }
ac27a0ec 5504#endif
d4c402d9 5505
1751e8a6 5506 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5507 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5508 kfree(orig_data);
ac27a0ec 5509 return 0;
0b8e58a1 5510
ac27a0ec
DK		 5511restore_opts:
5512 sb->s_flags = old_sb_flags;
5513 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5514 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5515 sbi->s_resuid = old_opts.s_resuid;
5516 sbi->s_resgid = old_opts.s_resgid;
5517 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5518 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5519 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5520#ifdef CONFIG_QUOTA
5521 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5522 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
33458eab
TT		 5523 to_free[i] = get_qf_name(sb, sbi, i);
5524 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 5525 }
33458eab
TT		 5526 synchronize_rcu();
5527 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5528 kfree(to_free[i]);
ac27a0ec 5529#endif
d4c402d9 5530 kfree(orig_data);
ac27a0ec
DK		 5531 return err;
5532}
5533
689c958c
LX		 5534#ifdef CONFIG_QUOTA
5535static int ext4_statfs_project(struct super_block *sb,
5536 kprojid_t projid, struct kstatfs *buf)
5537{
5538 struct kqid qid;
5539 struct dquot *dquot;
5540 u64 limit;
5541 u64 curblock;
5542
5543 qid = make_kqid_projid(projid);
5544 dquot = dqget(sb, qid);
5545 if (IS_ERR(dquot))
5546 return PTR_ERR(dquot);
7b9ca4c6 5547 spin_lock(&dquot->dq_dqb_lock);
689c958c
LX		 5548
5549 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5550 dquot->dq_dqb.dqb_bsoftlimit :
5551 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5552 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 5553 curblock = (dquot->dq_dqb.dqb_curspace +
5554 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 5555 buf->f_blocks = limit;
5556 buf->f_bfree = buf->f_bavail =
5557 (buf->f_blocks > curblock) ?
5558 (buf->f_blocks - curblock) : 0;
5559 }
5560
5561 limit = dquot->dq_dqb.dqb_isoftlimit ?
5562 dquot->dq_dqb.dqb_isoftlimit :
5563 dquot->dq_dqb.dqb_ihardlimit;
5564 if (limit && buf->f_files > limit) {
5565 buf->f_files = limit;
5566 buf->f_ffree =
5567 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5568 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5569 }
5570
7b9ca4c6 5571 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5572 dqput(dquot);
5573 return 0;
5574}
5575#endif
5576
2b2d6d01 5577static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5578{
5579 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5580 struct ext4_sb_info *sbi = EXT4_SB(sb);
5581 struct ext4_super_block *es = sbi->s_es;
27dd4385 5582 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5583 u64 fsid;
d02a9391 5584 s64 bfree;
27dd4385 5585 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5586
952fc18e
TT		 5587 if (!test_opt(sb, MINIX_DF))
5588 overhead = sbi->s_overhead;
ac27a0ec 5589
617ba13b 5590 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5591 buf->f_bsize = sb->s_blocksize;
b72f78cb 5592 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5593 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5594 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5595 /* prevent underflow in case that few free space is available */
57042651 5596 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5597 buf->f_bavail = buf->f_bfree -
5598 (ext4_r_blocks_count(es) + resv_blocks);
5599 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5600 buf->f_bavail = 0;
5601 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5602 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5603 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5604 fsid = le64_to_cpup((void *)es->s_uuid) ^
5605 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5606 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5607 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5608
689c958c
LX		 5609#ifdef CONFIG_QUOTA
5610 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5611 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5612 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5613#endif
ac27a0ec
DK		 5614 return 0;
5615}
5616
ac27a0ec
DK		 5617
5618#ifdef CONFIG_QUOTA
5619
bc8230ee
JK		 5620/*
5621 * Helper functions so that transaction is started before we acquire dqio_sem
5622 * to keep correct lock ordering of transaction > dqio_sem
5623 */
ac27a0ec
DK		 5624static inline struct inode *dquot_to_inode(struct dquot *dquot)
5625{
4c376dca 5626 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5627}
5628
617ba13b 5629static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5630{
5631 int ret, err;
5632 handle_t *handle;
5633 struct inode *inode;
5634
5635 inode = dquot_to_inode(dquot);
9924a92a 5636 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5637 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5638 if (IS_ERR(handle))
5639 return PTR_ERR(handle);
5640 ret = dquot_commit(dquot);
617ba13b 5641 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5642 if (!ret)
5643 ret = err;
5644 return ret;
5645}
5646
617ba13b 5647static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5648{
5649 int ret, err;
5650 handle_t *handle;
5651
9924a92a 5652 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5653 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5654 if (IS_ERR(handle))
5655 return PTR_ERR(handle);
5656 ret = dquot_acquire(dquot);
617ba13b 5657 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5658 if (!ret)
5659 ret = err;
5660 return ret;
5661}
5662
617ba13b 5663static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5664{
5665 int ret, err;
5666 handle_t *handle;
5667
9924a92a 5668 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5669 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5670 if (IS_ERR(handle)) {
5671 /* Release dquot anyway to avoid endless cycle in dqput() */
5672 dquot_release(dquot);
ac27a0ec 5673 return PTR_ERR(handle);
9c3013e9 5674 }
ac27a0ec 5675 ret = dquot_release(dquot);
617ba13b 5676 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5677 if (!ret)
5678 ret = err;
5679 return ret;
5680}
5681
617ba13b 5682static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5683{
262b4662
JK		 5684 struct super_block *sb = dquot->dq_sb;
5685 struct ext4_sb_info *sbi = EXT4_SB(sb);
5686
2c8be6b2 5687 /* Are we journaling quotas? */
e2b911c5 5688 if (ext4_has_feature_quota(sb) ||
262b4662 5689 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5690 dquot_mark_dquot_dirty(dquot);
617ba13b 5691 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5692 } else {
5693 return dquot_mark_dquot_dirty(dquot);
5694 }
5695}
5696
617ba13b 5697static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5698{
5699 int ret, err;
5700 handle_t *handle;
5701
5702 /* Data block + inode block */
2b0143b5 5703 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5704 if (IS_ERR(handle))
5705 return PTR_ERR(handle);
5706 ret = dquot_commit_info(sb, type);
617ba13b 5707 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5708 if (!ret)
5709 ret = err;
5710 return ret;
5711}
5712
5713/*
5714 * Turn on quotas during mount time - we need to find
5715 * the quota file and such...
5716 */
617ba13b 5717static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5718{
33458eab 5719 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
287a8095 5720 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5721}
5722
daf647d2
TT		 5723static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5724{
5725 struct ext4_inode_info *ei = EXT4_I(inode);
5726
5727 /* The first argument of lockdep_set_subclass has to be
5728 * *exactly* the same as the argument to init_rwsem() --- in
5729 * this case, in init_once() --- or lockdep gets unhappy
5730 * because the name of the lock is set using the
5731 * stringification of the argument to init_rwsem().
5732 */
5733 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5734 lockdep_set_subclass(&ei->i_data_sem, subclass);
5735}
5736
ac27a0ec
DK		 5737/*
5738 * Standard function to be called on quota_on
5739 */
617ba13b 5740static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5741 const struct path *path)
ac27a0ec
DK		 5742{
5743 int err;
ac27a0ec
DK		 5744
5745 if (!test_opt(sb, QUOTA))
5746 return -EINVAL;
0623543b 5747
ac27a0ec 5748 /* Quotafile not on the same filesystem? */
d8c9584e 5749 if (path->dentry->d_sb != sb)
ac27a0ec 5750 return -EXDEV;
0623543b
JK		 5751 /* Journaling quota? */
5752 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5753 /* Quotafile not in fs root? */
f00c9e44 5754 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5755 ext4_msg(sb, KERN_WARNING,
5756 "Quota file not on filesystem root. "
5757 "Journaled quota will not work");
91389240
JK		 5758 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5759 } else {
5760 /*
5761 * Clear the flag just in case mount options changed since
5762 * last time.
5763 */
5764 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 5765 }
0623543b
JK		 5766
5767 /*
5768 * When we journal data on quota file, we have to flush journal to see
5769 * all updates to the file when we bypass pagecache...
5770 */
0390131b 5771 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5772 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5773 /*
5774 * We don't need to lock updates but journal_flush() could
5775 * otherwise be livelocked...
5776 */
5777 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5778 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5779 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5780 if (err)
7ffe1ea8 5781 return err;
0623543b 5782 }
957153fc 5783
daf647d2
TT		 5784 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5785 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5786 if (err) {
daf647d2
TT		 5787 lockdep_set_quota_inode(path->dentry->d_inode,
5788 I_DATA_SEM_NORMAL);
957153fc
JK		 5789 } else {
5790 struct inode *inode = d_inode(path->dentry);
5791 handle_t *handle;
5792
61a92987
JK		 5793 /*
5794 * Set inode flags to prevent userspace from messing with quota
5795 * files. If this fails, we return success anyway since quotas
5796 * are already enabled and this is not a hard failure.
5797 */
957153fc
JK		 5798 inode_lock(inode);
5799 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5800 if (IS_ERR(handle))
5801 goto unlock_inode;
5802 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5803 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5804 S_NOATIME | S_IMMUTABLE);
5805 ext4_mark_inode_dirty(handle, inode);
5806 ext4_journal_stop(handle);
5807 unlock_inode:
5808 inode_unlock(inode);
5809 }
daf647d2 5810 return err;
ac27a0ec
DK		 5811}
5812
7c319d32
AK		 5813static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5814 unsigned int flags)
5815{
5816 int err;
5817 struct inode *qf_inode;
a2d4a646 5818 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5819 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5820 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5821 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5822 };
5823
e2b911c5 5824 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5825
5826 if (!qf_inums[type])
5827 return -EPERM;
5828
8a363970 5829 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32
AK		 5830 if (IS_ERR(qf_inode)) {
5831 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5832 return PTR_ERR(qf_inode);
5833 }
5834
bcb13850
JK		 5835 /* Don't account quota for quota files to avoid recursion */
5836 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5837 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32 5838 err = dquot_enable(qf_inode, type, format_id, flags);
daf647d2
TT		 5839 if (err)
5840 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
61157b24 5841 iput(qf_inode);
7c319d32
AK		 5842
5843 return err;
5844}
5845
5846/* Enable usage tracking for all quota types. */
5847static int ext4_enable_quotas(struct super_block *sb)
5848{
5849 int type, err = 0;
a2d4a646 5850 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5851 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5852 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5853 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5854 };
49da9392
JK		 5855 bool quota_mopt[EXT4_MAXQUOTAS] = {
5856 test_opt(sb, USRQUOTA),
5857 test_opt(sb, GRPQUOTA),
5858 test_opt(sb, PRJQUOTA),
5859 };
7c319d32 5860
91389240 5861 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 5862 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5863 if (qf_inums[type]) {
5864 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5865 DQUOT_USAGE_ENABLED |
5866 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 5867 if (err) {
5868 ext4_warning(sb,
72ba7450
TT		 5869 "Failed to enable quota tracking "
5870 "(type=%d, err=%d). Please run "
5871 "e2fsck to fix.", type, err);
7f144fd0
JU		 5872 for (type--; type >= 0; type--)
5873 dquot_quota_off(sb, type);
5874
7c319d32
AK		 5875 return err;
5876 }
5877 }
5878 }
5879 return 0;
5880}
5881
ca0e05e4
DM		 5882static int ext4_quota_off(struct super_block *sb, int type)
5883{
21f97697
JK		 5884 struct inode *inode = sb_dqopt(sb)->files[type];
5885 handle_t *handle;
957153fc 5886 int err;
21f97697 5887
87009d86
DM		 5888 /* Force all delayed allocation blocks to be allocated.
5889 * Caller already holds s_umount sem */
5890 if (test_opt(sb, DELALLOC))
ca0e05e4 5891 sync_filesystem(sb);
ca0e05e4 5892
957153fc 5893 if (!inode || !igrab(inode))
0b268590
AG		 5894 goto out;
5895
957153fc 5896 err = dquot_quota_off(sb, type);
964edf66 5897 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 5898 goto out_put;
5899
5900 inode_lock(inode);
61a92987
JK		 5901 /*
5902 * Update modification times of quota files when userspace can
5903 * start looking at them. If we fail, we return success anyway since
5904 * this is not a hard failure and quotas are already disabled.
5905 */
9924a92a 5906 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697 5907 if (IS_ERR(handle))
957153fc
JK		 5908 goto out_unlock;
5909 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5910 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 5911 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5912 ext4_mark_inode_dirty(handle, inode);
5913 ext4_journal_stop(handle);
957153fc
JK		 5914out_unlock:
5915 inode_unlock(inode);
5916out_put:
964edf66 5917 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 5918 iput(inode);
5919 return err;
21f97697 5920out:
ca0e05e4
DM		 5921 return dquot_quota_off(sb, type);
5922}
5923
ac27a0ec
DK		 5924/* Read data from quotafile - avoid pagecache and such because we cannot afford
5925 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5926 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5927 * we don't have to be afraid of races */
617ba13b 5928static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5929 size_t len, loff_t off)
5930{
5931 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5932 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5933 int offset = off & (sb->s_blocksize - 1);
5934 int tocopy;
5935 size_t toread;
5936 struct buffer_head *bh;
5937 loff_t i_size = i_size_read(inode);
5938
5939 if (off > i_size)
5940 return 0;
5941 if (off+len > i_size)
5942 len = i_size-off;
5943 toread = len;
5944 while (toread > 0) {
5945 tocopy = sb->s_blocksize - offset < toread ?
5946 sb->s_blocksize - offset : toread;
1c215028
TT		 5947 bh = ext4_bread(NULL, inode, blk, 0);
5948 if (IS_ERR(bh))
5949 return PTR_ERR(bh);
ac27a0ec
DK		 5950 if (!bh) /* A hole? */
5951 memset(data, 0, tocopy);
5952 else
5953 memcpy(data, bh->b_data+offset, tocopy);
5954 brelse(bh);
5955 offset = 0;
5956 toread -= tocopy;
5957 data += tocopy;
5958 blk++;
5959 }
5960 return len;
5961}
5962
5963/* Write to quotafile (we know the transaction is already started and has
5964 * enough credits) */
617ba13b 5965static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5966 const char *data, size_t len, loff_t off)
5967{
5968 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5969 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5970 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5971 int retries = 0;
ac27a0ec
DK		 5972 struct buffer_head *bh;
5973 handle_t *handle = journal_current_handle();
5974
0390131b 5975 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5976 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5977 " cancelled because transaction is not started",
9c3013e9
JK		 5978 (unsigned long long)off, (unsigned long long)len);
5979 return -EIO;
5980 }
67eeb568
DM		 5981 /*
5982 * Since we account only one data block in transaction credits,
5983 * then it is impossible to cross a block boundary.
5984 */
5985 if (sb->s_blocksize - offset < len) {
5986 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5987 " cancelled because not block aligned",
5988 (unsigned long long)off, (unsigned long long)len);
5989 return -EIO;
5990 }
5991
c5e298ae
TT		 5992 do {
5993 bh = ext4_bread(handle, inode, blk,
5994 EXT4_GET_BLOCKS_CREATE |
5995 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5996 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5997 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5998 if (IS_ERR(bh))
5999 return PTR_ERR(bh);
67eeb568
DM		 6000 if (!bh)
6001 goto out;
5d601255 6002 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 6003 err = ext4_journal_get_write_access(handle, bh);
6004 if (err) {
6005 brelse(bh);
1c215028 6006 return err;
ac27a0ec 6007 }
67eeb568
DM		 6008 lock_buffer(bh);
6009 memcpy(bh->b_data+offset, data, len);
6010 flush_dcache_page(bh->b_page);
6011 unlock_buffer(bh);
62d2b5f2 6012 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 6013 brelse(bh);
ac27a0ec 6014out:
67eeb568
DM		 6015 if (inode->i_size < off + len) {
6016 i_size_write(inode, off + len);
617ba13b 6017 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 6018 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 6019 }
67eeb568 6020 return len;
ac27a0ec
DK		 6021}
6022
8f0e8746
TT		 6023static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
6024{
6025 const struct quota_format_ops *ops;
6026
6027 if (!sb_has_quota_loaded(sb, qid->type))
6028 return -ESRCH;
6029 ops = sb_dqopt(sb)->ops[qid->type];
6030 if (!ops || !ops->get_next_id)
6031 return -ENOSYS;
6032 return dquot_get_next_id(sb, qid);
6033}
ac27a0ec
DK		 6034#endif
6035
152a0836
AV		 6036static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6037 const char *dev_name, void *data)
ac27a0ec 6038{
152a0836 6039 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 6040}
6041
c290ea01 6042#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 6043static inline void register_as_ext2(void)
6044{
6045 int err = register_filesystem(&ext2_fs_type);
6046 if (err)
6047 printk(KERN_WARNING
6048 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6049}
6050
6051static inline void unregister_as_ext2(void)
6052{
6053 unregister_filesystem(&ext2_fs_type);
6054}
2035e776
TT		 6055
6056static inline int ext2_feature_set_ok(struct super_block *sb)
6057{
e2b911c5 6058 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 6059 return 0;
bc98a42c 6060 if (sb_rdonly(sb))
2035e776 6061 return 1;
e2b911c5 6062 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 6063 return 0;
6064 return 1;
6065}
24b58424
TT		 6066#else
6067static inline void register_as_ext2(void) { }
6068static inline void unregister_as_ext2(void) { }
2035e776 6069static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 6070#endif
6071
24b58424
TT		 6072static inline void register_as_ext3(void)
6073{
6074 int err = register_filesystem(&ext3_fs_type);
6075 if (err)
6076 printk(KERN_WARNING
6077 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6078}
6079
6080static inline void unregister_as_ext3(void)
6081{
6082 unregister_filesystem(&ext3_fs_type);
6083}
2035e776
TT		 6084
6085static inline int ext3_feature_set_ok(struct super_block *sb)
6086{
e2b911c5 6087 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 6088 return 0;
e2b911c5 6089 if (!ext4_has_feature_journal(sb))
2035e776 6090 return 0;
bc98a42c 6091 if (sb_rdonly(sb))
2035e776 6092 return 1;
e2b911c5 6093 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 6094 return 0;
6095 return 1;
6096}
24b58424 6097
03010a33
TT		 6098static struct file_system_type ext4_fs_type = {
6099 .owner = THIS_MODULE,
6100 .name = "ext4",
152a0836 6101 .mount = ext4_mount,
03010a33
TT		 6102 .kill_sb = kill_block_super,
6103 .fs_flags = FS_REQUIRES_DEV,
6104};
7f78e035 6105MODULE_ALIAS_FS("ext4");
03010a33 6106
e9e3bcec
ES		 6107/* Shared across all ext4 file systems */
6108wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 6109
5dabfc78 6110static int __init ext4_init_fs(void)
ac27a0ec 6111{
e9e3bcec 6112 int i, err;
c9de560d 6113
e294a537 6114 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 6115 ext4_li_info = NULL;
6116 mutex_init(&ext4_li_mtx);
6117
9a4c8019 6118 /* Build-time check for flags consistency */
12e9b892 6119 ext4_check_flag_values();
e9e3bcec 6120
e142d052 6121 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 6122 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 6123
51865fda 6124 err = ext4_init_es();
6fd058f7
TT		 6125 if (err)
6126 return err;
51865fda 6127
1dc0aa46 6128 err = ext4_init_pending();
22cfe4b4
EB		 6129 if (err)
6130 goto out7;
6131
6132 err = ext4_init_post_read_processing();
1dc0aa46
EW		 6133 if (err)
6134 goto out6;
6135
51865fda
ZL		 6136 err = ext4_init_pageio();
6137 if (err)
b5799018 6138 goto out5;
51865fda 6139
5dabfc78 6140 err = ext4_init_system_zone();
bd2d0210 6141 if (err)
b5799018 6142 goto out4;
857ac889 6143
b5799018 6144 err = ext4_init_sysfs();
dd68314c 6145 if (err)
b5799018 6146 goto out3;
857ac889 6147
5dabfc78 6148 err = ext4_init_mballoc();
c9de560d
AT		 6149 if (err)
6150 goto out2;
ac27a0ec
DK		 6151 err = init_inodecache();
6152 if (err)
6153 goto out1;
24b58424 6154 register_as_ext3();
2035e776 6155 register_as_ext2();
03010a33 6156 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 6157 if (err)
6158 goto out;
bfff6873 6159
ac27a0ec
DK		 6160 return 0;
6161out:
24b58424
TT		 6162 unregister_as_ext2();
6163 unregister_as_ext3();
ac27a0ec
DK		 6164 destroy_inodecache();
6165out1:
5dabfc78 6166 ext4_exit_mballoc();
9c191f70 6167out2:
b5799018
TT		 6168 ext4_exit_sysfs();
6169out3:
5dabfc78 6170 ext4_exit_system_zone();
b5799018 6171out4:
5dabfc78 6172 ext4_exit_pageio();
b5799018 6173out5:
22cfe4b4 6174 ext4_exit_post_read_processing();
1dc0aa46 6175out6:
22cfe4b4
EB		 6176 ext4_exit_pending();
6177out7:
51865fda
ZL		 6178 ext4_exit_es();
6179
ac27a0ec
DK		 6180 return err;
6181}
6182
5dabfc78 6183static void __exit ext4_exit_fs(void)
ac27a0ec 6184{
bfff6873 6185 ext4_destroy_lazyinit_thread();
24b58424
TT		 6186 unregister_as_ext2();
6187 unregister_as_ext3();
03010a33 6188 unregister_filesystem(&ext4_fs_type);
ac27a0ec 6189 destroy_inodecache();
5dabfc78 6190 ext4_exit_mballoc();
b5799018 6191 ext4_exit_sysfs();
5dabfc78
TT		 6192 ext4_exit_system_zone();
6193 ext4_exit_pageio();
22cfe4b4 6194 ext4_exit_post_read_processing();
dd12ed14 6195 ext4_exit_es();
1dc0aa46 6196 ext4_exit_pending();
ac27a0ec
DK		 6197}
6198
6199MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 6200MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 6201MODULE_LICENSE("GPL");
7ef79ad5 6202MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 6203module_init(ext4_init_fs)
6204module_exit(ext4_exit_fs)
Linux 6.x block layer and io_uring tree(s)