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ext4: add prefetch_block_bitmaps mount option
[linux-block.git] / fs / ext4 / super.c
CommitLineData
f5166768 1// SPDX-License-Identifier: GPL-2.0
ac27a0ec 2/*
617ba13b 3 * linux/fs/ext4/super.c
ac27a0ec
DK		 4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
c5ca7c76 24#include <linux/vmalloc.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
66114cad 28#include <linux/backing-dev.h>
ac27a0ec 29#include <linux/parser.h>
ac27a0ec 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ef510424 41#include <linux/dax.h>
7abc52c2 42#include <linux/cleancache.h>
7c0f6ba6 43#include <linux/uaccess.h>
ee73f9a5 44#include <linux/iversion.h>
c83ad55e 45#include <linux/unicode.h>
c6a564ff 46#include <linux/part_stat.h>
bfff6873
LC		 47#include <linux/kthread.h>
48#include <linux/freezer.h>
49
3dcf5451 50#include "ext4.h"
4a092d73 51#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 52#include "ext4_jbd2.h"
ac27a0ec
DK		 53#include "xattr.h"
54#include "acl.h"
3661d286 55#include "mballoc.h"
0c9ec4be 56#include "fsmap.h"
ac27a0ec 57
9bffad1e
TT		 58#define CREATE_TRACE_POINTS
59#include <trace/events/ext4.h>
60
0b75a840
LC		 61static struct ext4_lazy_init *ext4_li_info;
62static struct mutex ext4_li_mtx;
e294a537 63static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 64
617ba13b 65static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 66 unsigned long journal_devnum);
2adf6da8 67static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 68static int ext4_commit_super(struct super_block *sb, int sync);
11215630 69static int ext4_mark_recovery_complete(struct super_block *sb,
2b2d6d01 70 struct ext4_super_block *es);
11215630
JK		 71static int ext4_clear_journal_err(struct super_block *sb,
72 struct ext4_super_block *es);
617ba13b 73static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
c6cb7e77
EW		 86static struct inode *ext4_get_journal_inode(struct super_block *sb,
87 unsigned int journal_inum);
ac27a0ec 88
e74031fd
JK		 89/*
90 * Lock ordering
91 *
92 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
93 * i_mmap_rwsem (inode->i_mmap_rwsem)!
94 *
95 * page fault path:
c1e8d7c6 96 * mmap_lock -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
e74031fd
JK		 97 * page lock -> i_data_sem (rw)
98 *
99 * buffered write path:
c1e8d7c6 100 * sb_start_write -> i_mutex -> mmap_lock
e74031fd
JK		 101 * sb_start_write -> i_mutex -> transaction start -> page lock ->
102 * i_data_sem (rw)
103 *
104 * truncate:
1d39834f
NB		 105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
106 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
107 * i_data_sem (rw)
e74031fd
JK		 108 *
109 * direct IO:
c1e8d7c6 110 * sb_start_write -> i_mutex -> mmap_lock
1d39834f 111 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
e74031fd
JK		 112 *
113 * writepages:
114 * transaction start -> page lock(s) -> i_data_sem (rw)
115 */
116
c290ea01 117#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 118static struct file_system_type ext2_fs_type = {
119 .owner = THIS_MODULE,
120 .name = "ext2",
121 .mount = ext4_mount,
122 .kill_sb = kill_block_super,
123 .fs_flags = FS_REQUIRES_DEV,
124};
7f78e035 125MODULE_ALIAS_FS("ext2");
fa7614dd 126MODULE_ALIAS("ext2");
2035e776
TT		 127#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
128#else
129#define IS_EXT2_SB(sb) (0)
130#endif
131
132
ba69f9ab
JK		 133static struct file_system_type ext3_fs_type = {
134 .owner = THIS_MODULE,
135 .name = "ext3",
152a0836 136 .mount = ext4_mount,
ba69f9ab
JK		 137 .kill_sb = kill_block_super,
138 .fs_flags = FS_REQUIRES_DEV,
139};
7f78e035 140MODULE_ALIAS_FS("ext3");
fa7614dd 141MODULE_ALIAS("ext3");
ba69f9ab 142#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 143
fb265c9c
TT		 144/*
145 * This works like sb_bread() except it uses ERR_PTR for error
146 * returns. Currently with sb_bread it's impossible to distinguish
147 * between ENOMEM and EIO situations (since both result in a NULL
148 * return.
149 */
150struct buffer_head *
151ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
152{
153 struct buffer_head *bh = sb_getblk(sb, block);
154
155 if (bh == NULL)
156 return ERR_PTR(-ENOMEM);
cf2834a5 157 if (ext4_buffer_uptodate(bh))
fb265c9c
TT		 158 return bh;
159 ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
160 wait_on_buffer(bh);
161 if (buffer_uptodate(bh))
162 return bh;
163 put_bh(bh);
164 return ERR_PTR(-EIO);
165}
166
d25425f8
DW		 167static int ext4_verify_csum_type(struct super_block *sb,
168 struct ext4_super_block *es)
169{
e2b911c5 170 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 171 return 1;
172
173 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
174}
175
a9c47317
DW		 176static __le32 ext4_superblock_csum(struct super_block *sb,
177 struct ext4_super_block *es)
178{
179 struct ext4_sb_info *sbi = EXT4_SB(sb);
180 int offset = offsetof(struct ext4_super_block, s_checksum);
181 __u32 csum;
182
183 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
184
185 return cpu_to_le32(csum);
186}
187
c197855e
SH		 188static int ext4_superblock_csum_verify(struct super_block *sb,
189 struct ext4_super_block *es)
a9c47317 190{
9aa5d32b 191 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 192 return 1;
193
194 return es->s_checksum == ext4_superblock_csum(sb, es);
195}
196
06db49e6 197void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 198{
06db49e6
TT		 199 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
200
9aa5d32b 201 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 202 return;
203
204 es->s_checksum = ext4_superblock_csum(sb, es);
205}
206
8fadc143
AR		 207ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
208 struct ext4_group_desc *bg)
bd81d8ee 209{
3a14589c 210 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 211 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 212 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 213}
214
8fadc143
AR		 215ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
216 struct ext4_group_desc *bg)
bd81d8ee 217{
5272f837 218 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 219 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 220 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 221}
222
8fadc143
AR		 223ext4_fsblk_t ext4_inode_table(struct super_block *sb,
224 struct ext4_group_desc *bg)
bd81d8ee 225{
5272f837 226 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 227 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 228 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 229}
230
021b65bb
TT		 231__u32 ext4_free_group_clusters(struct super_block *sb,
232 struct ext4_group_desc *bg)
560671a0
AK		 233{
234 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
235 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 236 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 237}
238
239__u32 ext4_free_inodes_count(struct super_block *sb,
240 struct ext4_group_desc *bg)
241{
242 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
243 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 244 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 245}
246
247__u32 ext4_used_dirs_count(struct super_block *sb,
248 struct ext4_group_desc *bg)
249{
250 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
251 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 252 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 253}
254
255__u32 ext4_itable_unused_count(struct super_block *sb,
256 struct ext4_group_desc *bg)
257{
258 return le16_to_cpu(bg->bg_itable_unused_lo) |
259 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 260 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 261}
262
8fadc143
AR		 263void ext4_block_bitmap_set(struct super_block *sb,
264 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 265{
3a14589c 266 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 267 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
268 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 269}
270
8fadc143
AR		 271void ext4_inode_bitmap_set(struct super_block *sb,
272 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 273{
5272f837 274 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 275 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
276 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 277}
278
8fadc143
AR		 279void ext4_inode_table_set(struct super_block *sb,
280 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 281{
5272f837 282 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 283 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
284 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 285}
286
021b65bb
TT		 287void ext4_free_group_clusters_set(struct super_block *sb,
288 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 289{
290 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
291 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
292 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
293}
294
295void ext4_free_inodes_set(struct super_block *sb,
296 struct ext4_group_desc *bg, __u32 count)
297{
298 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
299 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
300 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
301}
302
303void ext4_used_dirs_set(struct super_block *sb,
304 struct ext4_group_desc *bg, __u32 count)
305{
306 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
307 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
308 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
309}
310
311void ext4_itable_unused_set(struct super_block *sb,
312 struct ext4_group_desc *bg, __u32 count)
313{
314 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
315 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
316 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
317}
318
6a0678a7
AB		 319static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
320{
321 time64_t now = ktime_get_real_seconds();
322
323 now = clamp_val(now, 0, (1ull << 40) - 1);
324
325 *lo = cpu_to_le32(lower_32_bits(now));
326 *hi = upper_32_bits(now);
327}
328
329static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
330{
331 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
332}
333#define ext4_update_tstamp(es, tstamp) \
334 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
335#define ext4_get_tstamp(es, tstamp) \
336 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
d3d1faf6 337
54d3adbc
TT		 338static void __save_error_info(struct super_block *sb, int error,
339 __u32 ino, __u64 block,
340 const char *func, unsigned int line)
1c13d5c0
TT		 341{
342 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
54d3adbc 343 int err;
1c13d5c0
TT		 344
345 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 346 if (bdev_read_only(sb->s_bdev))
347 return;
1c13d5c0 348 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6a0678a7 349 ext4_update_tstamp(es, s_last_error_time);
1c13d5c0
TT		 350 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
351 es->s_last_error_line = cpu_to_le32(line);
54d3adbc
TT		 352 es->s_last_error_ino = cpu_to_le32(ino);
353 es->s_last_error_block = cpu_to_le64(block);
354 switch (error) {
355 case EIO:
356 err = EXT4_ERR_EIO;
357 break;
358 case ENOMEM:
359 err = EXT4_ERR_ENOMEM;
360 break;
361 case EFSBADCRC:
362 err = EXT4_ERR_EFSBADCRC;
363 break;
364 case 0:
365 case EFSCORRUPTED:
366 err = EXT4_ERR_EFSCORRUPTED;
367 break;
368 case ENOSPC:
369 err = EXT4_ERR_ENOSPC;
370 break;
371 case ENOKEY:
372 err = EXT4_ERR_ENOKEY;
373 break;
374 case EROFS:
375 err = EXT4_ERR_EROFS;
376 break;
377 case EFBIG:
378 err = EXT4_ERR_EFBIG;
379 break;
380 case EEXIST:
381 err = EXT4_ERR_EEXIST;
382 break;
383 case ERANGE:
384 err = EXT4_ERR_ERANGE;
385 break;
386 case EOVERFLOW:
387 err = EXT4_ERR_EOVERFLOW;
388 break;
389 case EBUSY:
390 err = EXT4_ERR_EBUSY;
391 break;
392 case ENOTDIR:
393 err = EXT4_ERR_ENOTDIR;
394 break;
395 case ENOTEMPTY:
396 err = EXT4_ERR_ENOTEMPTY;
397 break;
398 case ESHUTDOWN:
399 err = EXT4_ERR_ESHUTDOWN;
400 break;
401 case EFAULT:
402 err = EXT4_ERR_EFAULT;
403 break;
404 default:
405 err = EXT4_ERR_UNKNOWN;
406 }
407 es->s_last_error_errcode = err;
1c13d5c0
TT		 408 if (!es->s_first_error_time) {
409 es->s_first_error_time = es->s_last_error_time;
6a0678a7 410 es->s_first_error_time_hi = es->s_last_error_time_hi;
1c13d5c0
TT		 411 strncpy(es->s_first_error_func, func,
412 sizeof(es->s_first_error_func));
413 es->s_first_error_line = cpu_to_le32(line);
414 es->s_first_error_ino = es->s_last_error_ino;
415 es->s_first_error_block = es->s_last_error_block;
878520ac 416 es->s_first_error_errcode = es->s_last_error_errcode;
1c13d5c0 417 }
66e61a9e
TT		 418 /*
419 * Start the daily error reporting function if it hasn't been
420 * started already
421 */
422 if (!es->s_error_count)
423 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 424 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 425}
426
54d3adbc
TT		 427static void save_error_info(struct super_block *sb, int error,
428 __u32 ino, __u64 block,
429 const char *func, unsigned int line)
1c13d5c0 430{
54d3adbc 431 __save_error_info(sb, error, ino, block, func, line);
c96e2b85
ES		 432 if (!bdev_read_only(sb->s_bdev))
433 ext4_commit_super(sb, 1);
1c13d5c0
TT		 434}
435
bdfe0cbd
TT		 436/*
437 * The del_gendisk() function uninitializes the disk-specific data
438 * structures, including the bdi structure, without telling anyone
439 * else. Once this happens, any attempt to call mark_buffer_dirty()
440 * (for example, by ext4_commit_super), will cause a kernel OOPS.
441 * This is a kludge to prevent these oops until we can put in a proper
442 * hook in del_gendisk() to inform the VFS and file system layers.
443 */
444static int block_device_ejected(struct super_block *sb)
445{
446 struct inode *bd_inode = sb->s_bdev->bd_inode;
447 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
448
449 return bdi->dev == NULL;
450}
451
18aadd47
BJ		 452static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
453{
454 struct super_block *sb = journal->j_private;
455 struct ext4_sb_info *sbi = EXT4_SB(sb);
456 int error = is_journal_aborted(journal);
5d3ee208 457 struct ext4_journal_cb_entry *jce;
18aadd47 458
5d3ee208 459 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 460
461 ext4_process_freed_data(sb, txn->t_tid);
462
18aadd47 463 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 464 while (!list_empty(&txn->t_private_list)) {
465 jce = list_entry(txn->t_private_list.next,
466 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 467 list_del_init(&jce->jce_list);
468 spin_unlock(&sbi->s_md_lock);
469 jce->jce_func(sb, jce, error);
470 spin_lock(&sbi->s_md_lock);
471 }
472 spin_unlock(&sbi->s_md_lock);
473}
1c13d5c0 474
1dc1097f
JK		 475static bool system_going_down(void)
476{
477 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
478 || system_state == SYSTEM_RESTART;
479}
480
ac27a0ec
DK		 481/* Deal with the reporting of failure conditions on a filesystem such as
482 * inconsistencies detected or read IO failures.
483 *
484 * On ext2, we can store the error state of the filesystem in the
617ba13b 485 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 486 * write ordering constraints on the superblock which prevent us from
487 * writing it out straight away; and given that the journal is about to
488 * be aborted, we can't rely on the current, or future, transactions to
489 * write out the superblock safely.
490 *
dab291af 491 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 492 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 493 * that error until we've noted it down and cleared it.
494 */
495
617ba13b 496static void ext4_handle_error(struct super_block *sb)
ac27a0ec 497{
327eaf73
TT		 498 if (test_opt(sb, WARN_ON_ERROR))
499 WARN_ON_ONCE(1);
500
bc98a42c 501 if (sb_rdonly(sb))
ac27a0ec
DK		 502 return;
503
2b2d6d01 504 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 505 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 506
4ab2f15b 507 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 508 if (journal)
dab291af 509 jbd2_journal_abort(journal, -EIO);
ac27a0ec 510 }
1dc1097f
JK		 511 /*
512 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
513 * could panic during 'reboot -f' as the underlying device got already
514 * disabled.
515 */
516 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
b31e1552 517 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 518 /*
519 * Make sure updated value of ->s_mount_flags will be visible
520 * before ->s_flags update
521 */
522 smp_wmb();
1751e8a6 523 sb->s_flags |= SB_RDONLY;
1dc1097f 524 } else if (test_opt(sb, ERRORS_PANIC)) {
617ba13b 525 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 526 sb->s_id);
4327ba52 527 }
ac27a0ec
DK		 528}
529
efbed4dc
TT		 530#define ext4_error_ratelimit(sb) \
531 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
532 "EXT4-fs error")
533
12062ddd 534void __ext4_error(struct super_block *sb, const char *function,
54d3adbc
TT		 535 unsigned int line, int error, __u64 block,
536 const char *fmt, ...)
ac27a0ec 537{
0ff2ea7d 538 struct va_format vaf;
ac27a0ec
DK		 539 va_list args;
540
0db1ff22
TT		 541 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
542 return;
543
ccf0f32a 544 trace_ext4_error(sb, function, line);
efbed4dc
TT		 545 if (ext4_error_ratelimit(sb)) {
546 va_start(args, fmt);
547 vaf.fmt = fmt;
548 vaf.va = &args;
549 printk(KERN_CRIT
550 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
551 sb->s_id, function, line, current->comm, &vaf);
552 va_end(args);
553 }
54d3adbc 554 save_error_info(sb, error, 0, block, function, line);
617ba13b 555 ext4_handle_error(sb);
ac27a0ec
DK		 556}
557
e7c96e8e 558void __ext4_error_inode(struct inode *inode, const char *function,
54d3adbc 559 unsigned int line, ext4_fsblk_t block, int error,
e7c96e8e 560 const char *fmt, ...)
273df556
FM		 561{
562 va_list args;
f7c21177 563 struct va_format vaf;
273df556 564
0db1ff22
TT		 565 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
566 return;
567
ccf0f32a 568 trace_ext4_error(inode->i_sb, function, line);
efbed4dc
TT		 569 if (ext4_error_ratelimit(inode->i_sb)) {
570 va_start(args, fmt);
571 vaf.fmt = fmt;
572 vaf.va = &args;
573 if (block)
574 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
575 "inode #%lu: block %llu: comm %s: %pV\n",
576 inode->i_sb->s_id, function, line, inode->i_ino,
577 block, current->comm, &vaf);
578 else
579 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
580 "inode #%lu: comm %s: %pV\n",
581 inode->i_sb->s_id, function, line, inode->i_ino,
582 current->comm, &vaf);
583 va_end(args);
584 }
54d3adbc
TT		 585 save_error_info(inode->i_sb, error, inode->i_ino, block,
586 function, line);
273df556
FM		 587 ext4_handle_error(inode->i_sb);
588}
589
e7c96e8e
JP		 590void __ext4_error_file(struct file *file, const char *function,
591 unsigned int line, ext4_fsblk_t block,
592 const char *fmt, ...)
273df556
FM		 593{
594 va_list args;
f7c21177 595 struct va_format vaf;
496ad9aa 596 struct inode *inode = file_inode(file);
273df556
FM		 597 char pathname[80], *path;
598
0db1ff22
TT		 599 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
600 return;
601
ccf0f32a 602 trace_ext4_error(inode->i_sb, function, line);
efbed4dc 603 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 604 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 605 if (IS_ERR(path))
606 path = "(unknown)";
607 va_start(args, fmt);
608 vaf.fmt = fmt;
609 vaf.va = &args;
610 if (block)
611 printk(KERN_CRIT
612 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
613 "block %llu: comm %s: path %s: %pV\n",
614 inode->i_sb->s_id, function, line, inode->i_ino,
615 block, current->comm, path, &vaf);
616 else
617 printk(KERN_CRIT
618 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
619 "comm %s: path %s: %pV\n",
620 inode->i_sb->s_id, function, line, inode->i_ino,
621 current->comm, path, &vaf);
622 va_end(args);
623 }
54d3adbc
TT		 624 save_error_info(inode->i_sb, EFSCORRUPTED, inode->i_ino, block,
625 function, line);
273df556
FM		 626 ext4_handle_error(inode->i_sb);
627}
628
722887dd
TT		 629const char *ext4_decode_error(struct super_block *sb, int errno,
630 char nbuf[16])
ac27a0ec
DK		 631{
632 char *errstr = NULL;
633
634 switch (errno) {
6a797d27
DW		 635 case -EFSCORRUPTED:
636 errstr = "Corrupt filesystem";
637 break;
638 case -EFSBADCRC:
639 errstr = "Filesystem failed CRC";
640 break;
ac27a0ec
DK		 641 case -EIO:
642 errstr = "IO failure";
643 break;
644 case -ENOMEM:
645 errstr = "Out of memory";
646 break;
647 case -EROFS:
78f1ddbb
TT		 648 if (!sb || (EXT4_SB(sb)->s_journal &&
649 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 650 errstr = "Journal has aborted";
651 else
652 errstr = "Readonly filesystem";
653 break;
654 default:
655 /* If the caller passed in an extra buffer for unknown
656 * errors, textualise them now. Else we just return
657 * NULL. */
658 if (nbuf) {
659 /* Check for truncated error codes... */
660 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
661 errstr = nbuf;
662 }
663 break;
664 }
665
666 return errstr;
667}
668
617ba13b 669/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 670 * automatically and invokes the appropriate error response. */
671
c398eda0
TT		 672void __ext4_std_error(struct super_block *sb, const char *function,
673 unsigned int line, int errno)
ac27a0ec
DK		 674{
675 char nbuf[16];
676 const char *errstr;
677
0db1ff22
TT		 678 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
679 return;
680
ac27a0ec
DK		 681 /* Special case: if the error is EROFS, and we're not already
682 * inside a transaction, then there's really no point in logging
683 * an error. */
bc98a42c 684 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 685 return;
686
efbed4dc
TT		 687 if (ext4_error_ratelimit(sb)) {
688 errstr = ext4_decode_error(sb, errno, nbuf);
689 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
690 sb->s_id, function, line, errstr);
691 }
ac27a0ec 692
54d3adbc 693 save_error_info(sb, -errno, 0, 0, function, line);
617ba13b 694 ext4_handle_error(sb);
ac27a0ec
DK		 695}
696
697/*
617ba13b 698 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 699 * abort function may be used to deal with unrecoverable failures such
700 * as journal IO errors or ENOMEM at a critical moment in log management.
701 *
702 * We unconditionally force the filesystem into an ABORT|READONLY state,
703 * unless the error response on the fs has been set to panic in which
704 * case we take the easy way out and panic immediately.
705 */
706
c67d859e 707void __ext4_abort(struct super_block *sb, const char *function,
54d3adbc 708 unsigned int line, int error, const char *fmt, ...)
ac27a0ec 709{
651e1c3b 710 struct va_format vaf;
ac27a0ec
DK		 711 va_list args;
712
0db1ff22
TT		 713 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
714 return;
715
54d3adbc 716 save_error_info(sb, error, 0, 0, function, line);
ac27a0ec 717 va_start(args, fmt);
651e1c3b
JP		 718 vaf.fmt = fmt;
719 vaf.va = &args;
720 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
721 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 722 va_end(args);
723
bc98a42c 724 if (sb_rdonly(sb) == 0) {
1c13d5c0 725 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
7b97d868 726 if (EXT4_SB(sb)->s_journal)
727 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
728
729 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 730 /*
731 * Make sure updated value of ->s_mount_flags will be visible
732 * before ->s_flags update
733 */
734 smp_wmb();
1751e8a6 735 sb->s_flags |= SB_RDONLY;
1c13d5c0 736 }
7b97d868 737 if (test_opt(sb, ERRORS_PANIC) && !system_going_down())
617ba13b 738 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 739}
740
e7c96e8e
JP		 741void __ext4_msg(struct super_block *sb,
742 const char *prefix, const char *fmt, ...)
b31e1552 743{
0ff2ea7d 744 struct va_format vaf;
b31e1552
ES		 745 va_list args;
746
efbed4dc
TT		 747 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
748 return;
749
b31e1552 750 va_start(args, fmt);
0ff2ea7d
JP		 751 vaf.fmt = fmt;
752 vaf.va = &args;
753 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 754 va_end(args);
755}
756
b03a2f7e
AD		 757#define ext4_warning_ratelimit(sb) \
758 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
759 "EXT4-fs warning")
760
12062ddd 761void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 762 unsigned int line, const char *fmt, ...)
ac27a0ec 763{
0ff2ea7d 764 struct va_format vaf;
ac27a0ec
DK		 765 va_list args;
766
b03a2f7e 767 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 768 return;
769
ac27a0ec 770 va_start(args, fmt);
0ff2ea7d
JP		 771 vaf.fmt = fmt;
772 vaf.va = &args;
773 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
774 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 775 va_end(args);
776}
777
b03a2f7e
AD		 778void __ext4_warning_inode(const struct inode *inode, const char *function,
779 unsigned int line, const char *fmt, ...)
780{
781 struct va_format vaf;
782 va_list args;
783
784 if (!ext4_warning_ratelimit(inode->i_sb))
785 return;
786
787 va_start(args, fmt);
788 vaf.fmt = fmt;
789 vaf.va = &args;
790 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
791 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
792 function, line, inode->i_ino, current->comm, &vaf);
793 va_end(args);
794}
795
e29136f8
TT		 796void __ext4_grp_locked_error(const char *function, unsigned int line,
797 struct super_block *sb, ext4_group_t grp,
798 unsigned long ino, ext4_fsblk_t block,
799 const char *fmt, ...)
5d1b1b3f
AK		 800__releases(bitlock)
801__acquires(bitlock)
802{
0ff2ea7d 803 struct va_format vaf;
5d1b1b3f 804 va_list args;
5d1b1b3f 805
0db1ff22
TT		 806 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
807 return;
808
ccf0f32a 809 trace_ext4_error(sb, function, line);
54d3adbc 810 __save_error_info(sb, EFSCORRUPTED, ino, block, function, line);
0ff2ea7d 811
efbed4dc
TT		 812 if (ext4_error_ratelimit(sb)) {
813 va_start(args, fmt);
814 vaf.fmt = fmt;
815 vaf.va = &args;
816 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
817 sb->s_id, function, line, grp);
818 if (ino)
819 printk(KERN_CONT "inode %lu: ", ino);
820 if (block)
821 printk(KERN_CONT "block %llu:",
822 (unsigned long long) block);
823 printk(KERN_CONT "%pV\n", &vaf);
824 va_end(args);
825 }
5d1b1b3f 826
327eaf73
TT		 827 if (test_opt(sb, WARN_ON_ERROR))
828 WARN_ON_ONCE(1);
829
5d1b1b3f 830 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 831 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 832 return;
833 }
1c13d5c0 834
5d1b1b3f 835 ext4_unlock_group(sb, grp);
06f29cc8 836 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 837 ext4_handle_error(sb);
838 /*
839 * We only get here in the ERRORS_RO case; relocking the group
840 * may be dangerous, but nothing bad will happen since the
841 * filesystem will have already been marked read/only and the
842 * journal has been aborted. We return 1 as a hint to callers
843 * who might what to use the return value from
25985edc 844 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 845 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
846 * aggressively from the ext4 function in question, with a
847 * more appropriate error code.
848 */
849 ext4_lock_group(sb, grp);
850 return;
851}
852
db79e6d1
WS		 853void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
854 ext4_group_t group,
855 unsigned int flags)
856{
857 struct ext4_sb_info *sbi = EXT4_SB(sb);
858 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
859 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
9af0b3d1
WS		 860 int ret;
861
862 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
863 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
864 &grp->bb_state);
865 if (!ret)
866 percpu_counter_sub(&sbi->s_freeclusters_counter,
867 grp->bb_free);
db79e6d1
WS		 868 }
869
9af0b3d1
WS		 870 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
871 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
872 &grp->bb_state);
873 if (!ret && gdp) {
db79e6d1
WS		 874 int count;
875
876 count = ext4_free_inodes_count(sb, gdp);
877 percpu_counter_sub(&sbi->s_freeinodes_counter,
878 count);
879 }
db79e6d1
WS		 880 }
881}
882
617ba13b 883void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 884{
617ba13b 885 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 886
617ba13b 887 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 888 return;
889
12062ddd 890 ext4_warning(sb,
ac27a0ec
DK		 891 "updating to rev %d because of new feature flag, "
892 "running e2fsck is recommended",
617ba13b 893 EXT4_DYNAMIC_REV);
ac27a0ec 894
617ba13b
MC		 895 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
896 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
897 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 898 /* leave es->s_feature_*compat flags alone */
899 /* es->s_uuid will be set by e2fsck if empty */
900
901 /*
902 * The rest of the superblock fields should be zero, and if not it
903 * means they are likely already in use, so leave them alone. We
904 * can leave it up to e2fsck to clean up any inconsistencies there.
905 */
906}
907
908/*
909 * Open the external journal device
910 */
b31e1552 911static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 912{
913 struct block_device *bdev;
ac27a0ec 914
d4d77629 915 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 916 if (IS_ERR(bdev))
917 goto fail;
918 return bdev;
919
920fail:
ea3edd4d
CH		 921 ext4_msg(sb, KERN_ERR,
922 "failed to open journal device unknown-block(%u,%u) %ld",
923 MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
ac27a0ec
DK		 924 return NULL;
925}
926
927/*
928 * Release the journal device
929 */
4385bab1 930static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 931{
4385bab1 932 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 933}
934
4385bab1 935static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 936{
937 struct block_device *bdev;
ac27a0ec
DK		 938 bdev = sbi->journal_bdev;
939 if (bdev) {
4385bab1 940 ext4_blkdev_put(bdev);
ac27a0ec
DK		 941 sbi->journal_bdev = NULL;
942 }
ac27a0ec
DK		 943}
944
945static inline struct inode *orphan_list_entry(struct list_head *l)
946{
617ba13b 947 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 948}
949
617ba13b 950static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 951{
952 struct list_head *l;
953
b31e1552
ES		 954 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
955 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 956
957 printk(KERN_ERR "sb_info orphan list:\n");
958 list_for_each(l, &sbi->s_orphan) {
959 struct inode *inode = orphan_list_entry(l);
960 printk(KERN_ERR " "
961 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
962 inode->i_sb->s_id, inode->i_ino, inode,
963 inode->i_mode, inode->i_nlink,
964 NEXT_ORPHAN(inode));
965 }
966}
967
957153fc
JK		 968#ifdef CONFIG_QUOTA
969static int ext4_quota_off(struct super_block *sb, int type);
970
971static inline void ext4_quota_off_umount(struct super_block *sb)
972{
973 int type;
974
964edf66
JK		 975 /* Use our quota_off function to clear inode flags etc. */
976 for (type = 0; type < EXT4_MAXQUOTAS; type++)
977 ext4_quota_off(sb, type);
957153fc 978}
33458eab
TT		 979
980/*
981 * This is a helper function which is used in the mount/remount
982 * codepaths (which holds s_umount) to fetch the quota file name.
983 */
984static inline char *get_qf_name(struct super_block *sb,
985 struct ext4_sb_info *sbi,
986 int type)
987{
988 return rcu_dereference_protected(sbi->s_qf_names[type],
989 lockdep_is_held(&sb->s_umount));
990}
957153fc
JK		 991#else
992static inline void ext4_quota_off_umount(struct super_block *sb)
993{
994}
995#endif
996
2b2d6d01 997static void ext4_put_super(struct super_block *sb)
ac27a0ec 998{
617ba13b
MC		 999 struct ext4_sb_info *sbi = EXT4_SB(sb);
1000 struct ext4_super_block *es = sbi->s_es;
1d0c3924 1001 struct buffer_head **group_desc;
7c990728 1002 struct flex_groups **flex_groups;
97abd7d4 1003 int aborted = 0;
ef2cabf7 1004 int i, err;
ac27a0ec 1005
857ac889 1006 ext4_unregister_li_request(sb);
957153fc 1007 ext4_quota_off_umount(sb);
e0ccfd95 1008
2e8fa54e 1009 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 1010
5e47868f
RH		 1011 /*
1012 * Unregister sysfs before destroying jbd2 journal.
1013 * Since we could still access attr_journal_task attribute via sysfs
1014 * path which could have sbi->s_journal->j_task as NULL
1015 */
1016 ext4_unregister_sysfs(sb);
1017
0390131b 1018 if (sbi->s_journal) {
97abd7d4 1019 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 1020 err = jbd2_journal_destroy(sbi->s_journal);
1021 sbi->s_journal = NULL;
878520ac 1022 if ((err < 0) && !aborted) {
54d3adbc 1023 ext4_abort(sb, -err, "Couldn't clean up the journal");
878520ac 1024 }
0390131b 1025 }
d4edac31 1026
d3922a77 1027 ext4_es_unregister_shrinker(sbi);
9105bb14 1028 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 1029 ext4_release_system_zone(sb);
1030 ext4_mb_release(sb);
1031 ext4_ext_release(sb);
d4edac31 1032
bc98a42c 1033 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 1034 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 1035 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 1036 }
bc98a42c 1037 if (!sb_rdonly(sb))
a8e25a83
AB		 1038 ext4_commit_super(sb, 1);
1039
1d0c3924
TT		 1040 rcu_read_lock();
1041 group_desc = rcu_dereference(sbi->s_group_desc);
ac27a0ec 1042 for (i = 0; i < sbi->s_gdb_count; i++)
1d0c3924
TT		 1043 brelse(group_desc[i]);
1044 kvfree(group_desc);
7c990728
SJS		 1045 flex_groups = rcu_dereference(sbi->s_flex_groups);
1046 if (flex_groups) {
1047 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1048 kvfree(flex_groups[i]);
1049 kvfree(flex_groups);
1050 }
1d0c3924 1051 rcu_read_unlock();
57042651 1052 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 1053 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1054 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 1055 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
bbd55937 1056 percpu_free_rwsem(&sbi->s_writepages_rwsem);
ac27a0ec 1057#ifdef CONFIG_QUOTA
a2d4a646 1058 for (i = 0; i < EXT4_MAXQUOTAS; i++)
33458eab 1059 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 1060#endif
1061
1062 /* Debugging code just in case the in-memory inode orphan list
1063 * isn't empty. The on-disk one can be non-empty if we've
1064 * detected an error and taken the fs readonly, but the
1065 * in-memory list had better be clean by this point. */
1066 if (!list_empty(&sbi->s_orphan))
1067 dump_orphan_list(sb, sbi);
1068 J_ASSERT(list_empty(&sbi->s_orphan));
1069
89d96a6f 1070 sync_blockdev(sb->s_bdev);
f98393a6 1071 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 1072 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1073 /*
1074 * Invalidate the journal device's buffers. We don't want them
1075 * floating about in memory - the physical journal device may
1076 * hotswapped, and it breaks the `ro-after' testing code.
1077 */
1078 sync_blockdev(sbi->journal_bdev);
f98393a6 1079 invalidate_bdev(sbi->journal_bdev);
617ba13b 1080 ext4_blkdev_remove(sbi);
ac27a0ec 1081 }
50c15df6
CX		 1082
1083 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1084 sbi->s_ea_inode_cache = NULL;
1085
1086 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1087 sbi->s_ea_block_cache = NULL;
1088
c5e06d10
JL		 1089 if (sbi->s_mmp_tsk)
1090 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 1091 brelse(sbi->s_sbh);
ac27a0ec 1092 sb->s_fs_info = NULL;
3197ebdb
TT		 1093 /*
1094 * Now that we are completely done shutting down the
1095 * superblock, we need to actually destroy the kobject.
1096 */
3197ebdb
TT		 1097 kobject_put(&sbi->s_kobj);
1098 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1099 if (sbi->s_chksum_driver)
1100 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1101 kfree(sbi->s_blockgroup_lock);
5e405595 1102 fs_put_dax(sbi->s_daxdev);
ed318a6c 1103 fscrypt_free_dummy_context(&sbi->s_dummy_enc_ctx);
c83ad55e
GKB		 1104#ifdef CONFIG_UNICODE
1105 utf8_unload(sbi->s_encoding);
1106#endif
ac27a0ec 1107 kfree(sbi);
ac27a0ec
DK		 1108}
1109
e18b890b 1110static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1111
1112/*
1113 * Called inside transaction, so use GFP_NOFS
1114 */
617ba13b 1115static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1116{
617ba13b 1117 struct ext4_inode_info *ei;
ac27a0ec 1118
e6b4f8da 1119 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1120 if (!ei)
1121 return NULL;
0b8e58a1 1122
ee73f9a5 1123 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 1124 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 1125 INIT_LIST_HEAD(&ei->i_prealloc_list);
1126 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1127 ext4_es_init_tree(&ei->i_es_tree);
1128 rwlock_init(&ei->i_es_lock);
edaa53ca 1129 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1130 ei->i_es_all_nr = 0;
edaa53ca 1131 ei->i_es_shk_nr = 0;
dd475925 1132 ei->i_es_shrink_lblk = 0;
d2a17637 1133 ei->i_reserved_data_blocks = 0;
d2a17637 1134 spin_lock_init(&(ei->i_block_reservation_lock));
1dc0aa46 1135 ext4_init_pending_tree(&ei->i_pending_tree);
a9e7f447
DM		 1136#ifdef CONFIG_QUOTA
1137 ei->i_reserved_quota = 0;
96c7e0d9 1138 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1139#endif
8aefcd55 1140 ei->jinode = NULL;
2e8fa54e 1141 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1142 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1143 ei->i_sync_tid = 0;
1144 ei->i_datasync_tid = 0;
e27f41e1 1145 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1146 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 1147 return &ei->vfs_inode;
1148}
1149
7ff9c073
TT		 1150static int ext4_drop_inode(struct inode *inode)
1151{
1152 int drop = generic_drop_inode(inode);
1153
29b3692e
EB		 1154 if (!drop)
1155 drop = fscrypt_drop_inode(inode);
1156
7ff9c073
TT		 1157 trace_ext4_drop_inode(inode, drop);
1158 return drop;
1159}
1160
94053139 1161static void ext4_free_in_core_inode(struct inode *inode)
fa0d7e3d 1162{
2c58d548 1163 fscrypt_free_inode(inode);
fa0d7e3d
NP		 1164 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1165}
1166
617ba13b 1167static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1168{
9f7dd93d 1169 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1170 ext4_msg(inode->i_sb, KERN_ERR,
1171 "Inode %lu (%p): orphan list check failed!",
1172 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1173 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1174 EXT4_I(inode), sizeof(struct ext4_inode_info),
1175 true);
1176 dump_stack();
1177 }
ac27a0ec
DK		 1178}
1179
51cc5068 1180static void init_once(void *foo)
ac27a0ec 1181{
617ba13b 1182 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1183
a35afb83 1184 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1185 init_rwsem(&ei->xattr_sem);
0e855ac8 1186 init_rwsem(&ei->i_data_sem);
ea3d7209 1187 init_rwsem(&ei->i_mmap_sem);
a35afb83 1188 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1189}
1190
e67bc2b3 1191static int __init init_inodecache(void)
ac27a0ec 1192{
f8dd7c70
DW		 1193 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1194 sizeof(struct ext4_inode_info), 0,
1195 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1196 SLAB_ACCOUNT),
1197 offsetof(struct ext4_inode_info, i_data),
1198 sizeof_field(struct ext4_inode_info, i_data),
1199 init_once);
617ba13b 1200 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1201 return -ENOMEM;
1202 return 0;
1203}
1204
1205static void destroy_inodecache(void)
1206{
8c0a8537
KS		 1207 /*
1208 * Make sure all delayed rcu free inodes are flushed before we
1209 * destroy cache.
1210 */
1211 rcu_barrier();
617ba13b 1212 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1213}
1214
0930fcc1 1215void ext4_clear_inode(struct inode *inode)
ac27a0ec 1216{
0930fcc1 1217 invalidate_inode_buffers(inode);
dbd5768f 1218 clear_inode(inode);
c2ea3fde 1219 ext4_discard_preallocations(inode);
51865fda 1220 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
f4c2d372 1221 dquot_drop(inode);
8aefcd55
TT		 1222 if (EXT4_I(inode)->jinode) {
1223 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1224 EXT4_I(inode)->jinode);
1225 jbd2_free_inode(EXT4_I(inode)->jinode);
1226 EXT4_I(inode)->jinode = NULL;
1227 }
3d204e24 1228 fscrypt_put_encryption_info(inode);
c93d8f88 1229 fsverity_cleanup_inode(inode);
ac27a0ec
DK		 1230}
1231
1b961ac0 1232static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1233 u64 ino, u32 generation)
ac27a0ec 1234{
ac27a0ec 1235 struct inode *inode;
ac27a0ec 1236
8a363970 1237 /*
ac27a0ec
DK		 1238 * Currently we don't know the generation for parent directory, so
1239 * a generation of 0 means "accept any"
1240 */
8a363970 1241 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1242 if (IS_ERR(inode))
1243 return ERR_CAST(inode);
1244 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1245 iput(inode);
1246 return ERR_PTR(-ESTALE);
1247 }
1b961ac0
CH		 1248
1249 return inode;
1250}
1251
1252static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1253 int fh_len, int fh_type)
1b961ac0
CH		 1254{
1255 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1256 ext4_nfs_get_inode);
1257}
1258
1259static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1260 int fh_len, int fh_type)
1b961ac0
CH		 1261{
1262 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1263 ext4_nfs_get_inode);
ac27a0ec
DK		 1264}
1265
fde87268
TT		 1266static int ext4_nfs_commit_metadata(struct inode *inode)
1267{
1268 struct writeback_control wbc = {
1269 .sync_mode = WB_SYNC_ALL
1270 };
1271
1272 trace_ext4_nfs_commit_metadata(inode);
1273 return ext4_write_inode(inode, &wbc);
1274}
1275
c39a7f84
TO		 1276/*
1277 * Try to release metadata pages (indirect blocks, directories) which are
1278 * mapped via the block device. Since these pages could have journal heads
1279 * which would prevent try_to_free_buffers() from freeing them, we must use
1280 * jbd2 layer's try_to_free_buffers() function to release them.
1281 */
0b8e58a1
AD		 1282static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1283 gfp_t wait)
c39a7f84
TO		 1284{
1285 journal_t *journal = EXT4_SB(sb)->s_journal;
1286
1287 WARN_ON(PageChecked(page));
1288 if (!page_has_buffers(page))
1289 return 0;
1290 if (journal)
529a781e 1291 return jbd2_journal_try_to_free_buffers(journal, page);
1292
c39a7f84
TO		 1293 return try_to_free_buffers(page);
1294}
1295
643fa961 1296#ifdef CONFIG_FS_ENCRYPTION
a7550b30
JK		 1297static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1298{
1299 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1300 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1301}
1302
a7550b30
JK		 1303static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1304 void *fs_data)
1305{
2f8f5e76 1306 handle_t *handle = fs_data;
c1a5d5f6 1307 int res, res2, credits, retries = 0;
2f8f5e76 1308
9ce0151a
EB		 1309 /*
1310 * Encrypting the root directory is not allowed because e2fsck expects
1311 * lost+found to exist and be unencrypted, and encrypting the root
1312 * directory would imply encrypting the lost+found directory as well as
1313 * the filename "lost+found" itself.
1314 */
1315 if (inode->i_ino == EXT4_ROOT_INO)
1316 return -EPERM;
2f8f5e76 1317
7d3e06a8
RZ		 1318 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1319 return -EINVAL;
1320
b383a73f
IW		 1321 if (ext4_test_inode_flag(inode, EXT4_INODE_DAX))
1322 return -EOPNOTSUPP;
1323
94840e3c
EB		 1324 res = ext4_convert_inline_data(inode);
1325 if (res)
1326 return res;
1327
2f8f5e76
EB		 1328 /*
1329 * If a journal handle was specified, then the encryption context is
1330 * being set on a new inode via inheritance and is part of a larger
1331 * transaction to create the inode. Otherwise the encryption context is
1332 * being set on an existing inode in its own transaction. Only in the
1333 * latter case should the "retry on ENOSPC" logic be used.
1334 */
a7550b30 1335
2f8f5e76
EB		 1336 if (handle) {
1337 res = ext4_xattr_set_handle(handle, inode,
1338 EXT4_XATTR_INDEX_ENCRYPTION,
1339 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1340 ctx, len, 0);
a7550b30
JK		 1341 if (!res) {
1342 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1343 ext4_clear_inode_state(inode,
1344 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1345 /*
2ee6a576
EB		 1346 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1347 * S_DAX may be disabled
a3caa24b 1348 */
043546e4 1349 ext4_set_inode_flags(inode, false);
a7550b30
JK		 1350 }
1351 return res;
1352 }
1353
b8cb5a54
TE		 1354 res = dquot_initialize(inode);
1355 if (res)
1356 return res;
2f8f5e76 1357retry:
af65207c
TE		 1358 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1359 &credits);
dec214d0
TE		 1360 if (res)
1361 return res;
1362
c1a5d5f6 1363 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1364 if (IS_ERR(handle))
1365 return PTR_ERR(handle);
1366
2f8f5e76
EB		 1367 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1368 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1369 ctx, len, 0);
a7550b30
JK		 1370 if (!res) {
1371 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1372 /*
1373 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1374 * S_DAX may be disabled
1375 */
043546e4 1376 ext4_set_inode_flags(inode, false);
a7550b30
JK		 1377 res = ext4_mark_inode_dirty(handle, inode);
1378 if (res)
1379 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1380 }
1381 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1382
1383 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1384 goto retry;
a7550b30
JK		 1385 if (!res)
1386 res = res2;
1387 return res;
1388}
1389
ed318a6c
EB		 1390static const union fscrypt_context *
1391ext4_get_dummy_context(struct super_block *sb)
a7550b30 1392{
ed318a6c 1393 return EXT4_SB(sb)->s_dummy_enc_ctx.ctx;
a7550b30
JK		 1394}
1395
b925acb8
EB		 1396static bool ext4_has_stable_inodes(struct super_block *sb)
1397{
1398 return ext4_has_feature_stable_inodes(sb);
1399}
1400
1401static void ext4_get_ino_and_lblk_bits(struct super_block *sb,
1402 int *ino_bits_ret, int *lblk_bits_ret)
1403{
1404 *ino_bits_ret = 8 * sizeof(EXT4_SB(sb)->s_es->s_inodes_count);
1405 *lblk_bits_ret = 8 * sizeof(ext4_lblk_t);
1406}
1407
6f69f0ed 1408static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1409 .key_prefix = "ext4:",
a7550b30 1410 .get_context = ext4_get_context,
a7550b30 1411 .set_context = ext4_set_context,
ed318a6c 1412 .get_dummy_context = ext4_get_dummy_context,
a7550b30 1413 .empty_dir = ext4_empty_dir,
e12ee683 1414 .max_namelen = EXT4_NAME_LEN,
b925acb8
EB		 1415 .has_stable_inodes = ext4_has_stable_inodes,
1416 .get_ino_and_lblk_bits = ext4_get_ino_and_lblk_bits,
a7550b30 1417};
a7550b30
JK		 1418#endif
1419
ac27a0ec 1420#ifdef CONFIG_QUOTA
d6006186 1421static const char * const quotatypes[] = INITQFNAMES;
689c958c 1422#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1423
617ba13b
MC		 1424static int ext4_write_dquot(struct dquot *dquot);
1425static int ext4_acquire_dquot(struct dquot *dquot);
1426static int ext4_release_dquot(struct dquot *dquot);
1427static int ext4_mark_dquot_dirty(struct dquot *dquot);
1428static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1429static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1430 const struct path *path);
617ba13b
MC		 1431static int ext4_quota_on_mount(struct super_block *sb, int type);
1432static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1433 size_t len, loff_t off);
617ba13b 1434static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1435 const char *data, size_t len, loff_t off);
7c319d32
AK		 1436static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1437 unsigned int flags);
1438static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1439
96c7e0d9
JK		 1440static struct dquot **ext4_get_dquots(struct inode *inode)
1441{
1442 return EXT4_I(inode)->i_dquot;
1443}
1444
61e225dc 1445static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1446 .get_reserved_space = ext4_get_reserved_space,
1447 .write_dquot = ext4_write_dquot,
1448 .acquire_dquot = ext4_acquire_dquot,
1449 .release_dquot = ext4_release_dquot,
1450 .mark_dirty = ext4_mark_dquot_dirty,
1451 .write_info = ext4_write_info,
1452 .alloc_dquot = dquot_alloc,
1453 .destroy_dquot = dquot_destroy,
1454 .get_projid = ext4_get_projid,
1455 .get_inode_usage = ext4_get_inode_usage,
ebc11f7b 1456 .get_next_id = dquot_get_next_id,
ac27a0ec
DK		 1457};
1458
0d54b217 1459static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1460 .quota_on = ext4_quota_on,
ca0e05e4 1461 .quota_off = ext4_quota_off,
287a8095 1462 .quota_sync = dquot_quota_sync,
0a240339 1463 .get_state = dquot_get_state,
287a8095
CH		 1464 .set_info = dquot_set_dqinfo,
1465 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1466 .set_dqblk = dquot_set_dqblk,
1467 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1468};
1469#endif
1470
ee9b6d61 1471static const struct super_operations ext4_sops = {
617ba13b 1472 .alloc_inode = ext4_alloc_inode,
94053139 1473 .free_inode = ext4_free_in_core_inode,
617ba13b 1474 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1475 .write_inode = ext4_write_inode,
1476 .dirty_inode = ext4_dirty_inode,
7ff9c073 1477 .drop_inode = ext4_drop_inode,
0930fcc1 1478 .evict_inode = ext4_evict_inode,
617ba13b 1479 .put_super = ext4_put_super,
617ba13b 1480 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1481 .freeze_fs = ext4_freeze,
1482 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1483 .statfs = ext4_statfs,
1484 .remount_fs = ext4_remount,
617ba13b 1485 .show_options = ext4_show_options,
ac27a0ec 1486#ifdef CONFIG_QUOTA
617ba13b
MC		 1487 .quota_read = ext4_quota_read,
1488 .quota_write = ext4_quota_write,
96c7e0d9 1489 .get_dquots = ext4_get_dquots,
ac27a0ec 1490#endif
c39a7f84 1491 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1492};
1493
39655164 1494static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1495 .fh_to_dentry = ext4_fh_to_dentry,
1496 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1497 .get_parent = ext4_get_parent,
fde87268 1498 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1499};
1500
1501enum {
1502 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1503 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1504 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1505 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1506 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1507 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1508 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1509 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1510 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1511 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1512 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1513 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
9cb20f94
IW		 1514 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version,
1515 Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
327eaf73
TT		 1516 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1517 Opt_nowarn_on_error, Opt_mblk_io_submit,
670e9875 1518 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1519 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1520 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1521 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1522 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1523 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
3d392b26 1524 Opt_prefetch_block_bitmaps,
ac27a0ec
DK		 1525};
1526
a447c093 1527static const match_table_t tokens = {
ac27a0ec
DK		 1528 {Opt_bsd_df, "bsddf"},
1529 {Opt_minix_df, "minixdf"},
1530 {Opt_grpid, "grpid"},
1531 {Opt_grpid, "bsdgroups"},
1532 {Opt_nogrpid, "nogrpid"},
1533 {Opt_nogrpid, "sysvgroups"},
1534 {Opt_resgid, "resgid=%u"},
1535 {Opt_resuid, "resuid=%u"},
1536 {Opt_sb, "sb=%u"},
1537 {Opt_err_cont, "errors=continue"},
1538 {Opt_err_panic, "errors=panic"},
1539 {Opt_err_ro, "errors=remount-ro"},
1540 {Opt_nouid32, "nouid32"},
ac27a0ec 1541 {Opt_debug, "debug"},
72578c33
TT		 1542 {Opt_removed, "oldalloc"},
1543 {Opt_removed, "orlov"},
ac27a0ec
DK		 1544 {Opt_user_xattr, "user_xattr"},
1545 {Opt_nouser_xattr, "nouser_xattr"},
1546 {Opt_acl, "acl"},
1547 {Opt_noacl, "noacl"},
e3bb52ae 1548 {Opt_noload, "norecovery"},
5a916be1 1549 {Opt_noload, "noload"},
72578c33
TT		 1550 {Opt_removed, "nobh"},
1551 {Opt_removed, "bh"},
ac27a0ec 1552 {Opt_commit, "commit=%u"},
30773840
TT		 1553 {Opt_min_batch_time, "min_batch_time=%u"},
1554 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1555 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1556 {Opt_journal_path, "journal_path=%s"},
818d276c 1557 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1558 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1559 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1560 {Opt_abort, "abort"},
1561 {Opt_data_journal, "data=journal"},
1562 {Opt_data_ordered, "data=ordered"},
1563 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1564 {Opt_data_err_abort, "data_err=abort"},
1565 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1566 {Opt_offusrjquota, "usrjquota="},
1567 {Opt_usrjquota, "usrjquota=%s"},
1568 {Opt_offgrpjquota, "grpjquota="},
1569 {Opt_grpjquota, "grpjquota=%s"},
1570 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1571 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1572 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1573 {Opt_grpquota, "grpquota"},
1574 {Opt_noquota, "noquota"},
1575 {Opt_quota, "quota"},
1576 {Opt_usrquota, "usrquota"},
49da9392 1577 {Opt_prjquota, "prjquota"},
ac27a0ec 1578 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1579 {Opt_barrier, "barrier"},
1580 {Opt_nobarrier, "nobarrier"},
25ec56b5 1581 {Opt_i_version, "i_version"},
923ae0ff 1582 {Opt_dax, "dax"},
9cb20f94
IW		 1583 {Opt_dax_always, "dax=always"},
1584 {Opt_dax_inode, "dax=inode"},
1585 {Opt_dax_never, "dax=never"},
c9de560d 1586 {Opt_stripe, "stripe=%u"},
64769240 1587 {Opt_delalloc, "delalloc"},
327eaf73
TT		 1588 {Opt_warn_on_error, "warn_on_error"},
1589 {Opt_nowarn_on_error, "nowarn_on_error"},
a26f4992
TT		 1590 {Opt_lazytime, "lazytime"},
1591 {Opt_nolazytime, "nolazytime"},
670e9875 1592 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1593 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1594 {Opt_removed, "mblk_io_submit"},
1595 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1596 {Opt_block_validity, "block_validity"},
1597 {Opt_noblock_validity, "noblock_validity"},
240799cd 1598 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1599 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1600 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1601 {Opt_auto_da_alloc, "auto_da_alloc"},
1602 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc 1603 {Opt_dioread_nolock, "dioread_nolock"},
244adf64 1604 {Opt_dioread_lock, "nodioread_nolock"},
744692dc 1605 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1606 {Opt_discard, "discard"},
1607 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1608 {Opt_init_itable, "init_itable=%u"},
1609 {Opt_init_itable, "init_itable"},
1610 {Opt_noinit_itable, "noinit_itable"},
df981d03 1611 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
ed318a6c 1612 {Opt_test_dummy_encryption, "test_dummy_encryption=%s"},
6ddb2447 1613 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1614 {Opt_nombcache, "nombcache"},
1615 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
3d392b26 1616 {Opt_prefetch_block_bitmaps, "prefetch_block_bitmaps"},
c7198b9c
TT		 1617 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1618 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1619 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1620 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1621 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1622 {Opt_err, NULL},
ac27a0ec
DK		 1623};
1624
617ba13b 1625static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1626{
617ba13b 1627 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1628 char *options = (char *) *data;
1629
1630 if (!options || strncmp(options, "sb=", 3) != 0)
1631 return 1; /* Default location */
0b8e58a1 1632
ac27a0ec 1633 options += 3;
0b8e58a1 1634 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1635 sb_block = simple_strtoul(options, &options, 0);
1636 if (*options && *options != ',') {
4776004f 1637 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1638 (char *) *data);
1639 return 1;
1640 }
1641 if (*options == ',')
1642 options++;
1643 *data = (void *) options;
0b8e58a1 1644
ac27a0ec
DK		 1645 return sb_block;
1646}
1647
b3881f74 1648#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1649static const char deprecated_msg[] =
1650 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1651 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1652
56c50f11
DM		 1653#ifdef CONFIG_QUOTA
1654static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1655{
1656 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1657 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
03dafb5f 1658 int ret = -1;
56c50f11 1659
33458eab 1660 if (sb_any_quota_loaded(sb) && !old_qname) {
56c50f11
DM		 1661 ext4_msg(sb, KERN_ERR,
1662 "Cannot change journaled "
1663 "quota options when quota turned on");
57f73c2c 1664 return -1;
56c50f11 1665 }
e2b911c5 1666 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1667 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1668 "ignored when QUOTA feature is enabled");
1669 return 1;
262b4662 1670 }
56c50f11
DM		 1671 qname = match_strdup(args);
1672 if (!qname) {
1673 ext4_msg(sb, KERN_ERR,
1674 "Not enough memory for storing quotafile name");
57f73c2c 1675 return -1;
56c50f11 1676 }
33458eab
TT		 1677 if (old_qname) {
1678 if (strcmp(old_qname, qname) == 0)
03dafb5f
CG		 1679 ret = 1;
1680 else
1681 ext4_msg(sb, KERN_ERR,
1682 "%s quota file already specified",
1683 QTYPE2NAME(qtype));
1684 goto errout;
56c50f11 1685 }
03dafb5f 1686 if (strchr(qname, '/')) {
56c50f11
DM		 1687 ext4_msg(sb, KERN_ERR,
1688 "quotafile must be on filesystem root");
03dafb5f 1689 goto errout;
56c50f11 1690 }
33458eab 1691 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
fd8c37ec 1692 set_opt(sb, QUOTA);
56c50f11 1693 return 1;
03dafb5f
CG		 1694errout:
1695 kfree(qname);
1696 return ret;
56c50f11
DM		 1697}
1698
1699static int clear_qf_name(struct super_block *sb, int qtype)
1700{
1701
1702 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1703 char *old_qname = get_qf_name(sb, sbi, qtype);
56c50f11 1704
33458eab 1705 if (sb_any_quota_loaded(sb) && old_qname) {
56c50f11
DM		 1706 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1707 " when quota turned on");
57f73c2c 1708 return -1;
56c50f11 1709 }
33458eab
TT		 1710 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1711 synchronize_rcu();
1712 kfree(old_qname);
56c50f11
DM		 1713 return 1;
1714}
1715#endif
1716
26092bf5
TT		 1717#define MOPT_SET 0x0001
1718#define MOPT_CLEAR 0x0002
1719#define MOPT_NOSUPPORT 0x0004
1720#define MOPT_EXPLICIT 0x0008
1721#define MOPT_CLEAR_ERR 0x0010
1722#define MOPT_GTE0 0x0020
ac27a0ec 1723#ifdef CONFIG_QUOTA
26092bf5
TT		 1724#define MOPT_Q 0
1725#define MOPT_QFMT 0x0040
1726#else
1727#define MOPT_Q MOPT_NOSUPPORT
1728#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1729#endif
26092bf5 1730#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1731#define MOPT_NO_EXT2 0x0100
1732#define MOPT_NO_EXT3 0x0200
1733#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1734#define MOPT_STRING 0x0400
9cb20f94 1735#define MOPT_SKIP 0x0800
26092bf5
TT		 1736
1737static const struct mount_opts {
1738 int token;
1739 int mount_opt;
1740 int flags;
1741} ext4_mount_opts[] = {
1742 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1743 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1744 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1745 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1746 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1747 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1748 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1749 MOPT_EXT4_ONLY | MOPT_SET},
1750 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1751 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1752 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1753 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1754 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1755 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1756 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1757 MOPT_EXT4_ONLY | MOPT_CLEAR},
327eaf73
TT		 1758 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1759 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
c6d3d56d
DW		 1760 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1761 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1762 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1763 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1764 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1765 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1766 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1767 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1768 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1769 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1770 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1771 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1772 MOPT_NO_EXT2},
8dc0aa8c 1773 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1774 MOPT_NO_EXT2},
26092bf5
TT		 1775 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1776 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1777 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1778 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1779 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1780 {Opt_commit, 0, MOPT_GTE0},
1781 {Opt_max_batch_time, 0, MOPT_GTE0},
1782 {Opt_min_batch_time, 0, MOPT_GTE0},
1783 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1784 {Opt_init_itable, 0, MOPT_GTE0},
9cb20f94
IW		 1785 {Opt_dax, EXT4_MOUNT_DAX_ALWAYS, MOPT_SET | MOPT_SKIP},
1786 {Opt_dax_always, EXT4_MOUNT_DAX_ALWAYS,
1787 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
1788 {Opt_dax_inode, EXT4_MOUNT2_DAX_INODE,
1789 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
1790 {Opt_dax_never, EXT4_MOUNT2_DAX_NEVER,
1791 MOPT_EXT4_ONLY | MOPT_SET | MOPT_SKIP},
26092bf5 1792 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1793 {Opt_resuid, 0, MOPT_GTE0},
1794 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1795 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1796 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1797 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1798 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1799 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1800 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1801 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1802 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1803 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1804#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1805 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1806 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1807#else
26092bf5
TT		 1808 {Opt_acl, 0, MOPT_NOSUPPORT},
1809 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1810#endif
26092bf5
TT		 1811 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1812 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1813 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1814 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1815 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1816 MOPT_SET | MOPT_Q},
1817 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1818 MOPT_SET | MOPT_Q},
49da9392
JK		 1819 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1820 MOPT_SET | MOPT_Q},
26092bf5 1821 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1822 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1823 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1824 {Opt_usrjquota, 0, MOPT_Q},
1825 {Opt_grpjquota, 0, MOPT_Q},
1826 {Opt_offusrjquota, 0, MOPT_Q},
1827 {Opt_offgrpjquota, 0, MOPT_Q},
1828 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1829 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1830 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1831 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
ed318a6c 1832 {Opt_test_dummy_encryption, 0, MOPT_STRING},
cdb7ee4c 1833 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
3d392b26
TT		 1834 {Opt_prefetch_block_bitmaps, EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS,
1835 MOPT_SET},
26092bf5
TT		 1836 {Opt_err, 0, 0}
1837};
1838
c83ad55e
GKB		 1839#ifdef CONFIG_UNICODE
1840static const struct ext4_sb_encodings {
1841 __u16 magic;
1842 char *name;
1843 char *version;
1844} ext4_sb_encoding_map[] = {
1845 {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1846};
1847
1848static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1849 const struct ext4_sb_encodings **encoding,
1850 __u16 *flags)
1851{
1852 __u16 magic = le16_to_cpu(es->s_encoding);
1853 int i;
1854
1855 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1856 if (magic == ext4_sb_encoding_map[i].magic)
1857 break;
1858
1859 if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1860 return -EINVAL;
1861
1862 *encoding = &ext4_sb_encoding_map[i];
1863 *flags = le16_to_cpu(es->s_encoding_flags);
1864
1865 return 0;
1866}
1867#endif
1868
ed318a6c
EB		 1869static int ext4_set_test_dummy_encryption(struct super_block *sb,
1870 const char *opt,
1871 const substring_t *arg,
1872 bool is_remount)
1873{
1874#ifdef CONFIG_FS_ENCRYPTION
1875 struct ext4_sb_info *sbi = EXT4_SB(sb);
1876 int err;
1877
1878 /*
1879 * This mount option is just for testing, and it's not worthwhile to
1880 * implement the extra complexity (e.g. RCU protection) that would be
1881 * needed to allow it to be set or changed during remount. We do allow
1882 * it to be specified during remount, but only if there is no change.
1883 */
1884 if (is_remount && !sbi->s_dummy_enc_ctx.ctx) {
1885 ext4_msg(sb, KERN_WARNING,
1886 "Can't set test_dummy_encryption on remount");
1887 return -1;
1888 }
1889 err = fscrypt_set_test_dummy_encryption(sb, arg, &sbi->s_dummy_enc_ctx);
1890 if (err) {
1891 if (err == -EEXIST)
1892 ext4_msg(sb, KERN_WARNING,
1893 "Can't change test_dummy_encryption on remount");
1894 else if (err == -EINVAL)
1895 ext4_msg(sb, KERN_WARNING,
1896 "Value of option \"%s\" is unrecognized", opt);
1897 else
1898 ext4_msg(sb, KERN_WARNING,
1899 "Error processing option \"%s\" [%d]",
1900 opt, err);
1901 return -1;
1902 }
1903 ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
1904#else
1905 ext4_msg(sb, KERN_WARNING,
1906 "Test dummy encryption mount option ignored");
1907#endif
1908 return 1;
1909}
1910
26092bf5
TT		 1911static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1912 substring_t *args, unsigned long *journal_devnum,
1913 unsigned int *journal_ioprio, int is_remount)
1914{
1915 struct ext4_sb_info *sbi = EXT4_SB(sb);
1916 const struct mount_opts *m;
08cefc7a
EB		 1917 kuid_t uid;
1918 kgid_t gid;
26092bf5
TT		 1919 int arg = 0;
1920
57f73c2c
TT		 1921#ifdef CONFIG_QUOTA
1922 if (token == Opt_usrjquota)
1923 return set_qf_name(sb, USRQUOTA, &args[0]);
1924 else if (token == Opt_grpjquota)
1925 return set_qf_name(sb, GRPQUOTA, &args[0]);
1926 else if (token == Opt_offusrjquota)
1927 return clear_qf_name(sb, USRQUOTA);
1928 else if (token == Opt_offgrpjquota)
1929 return clear_qf_name(sb, GRPQUOTA);
1930#endif
26092bf5 1931 switch (token) {
f7048605
TT		 1932 case Opt_noacl:
1933 case Opt_nouser_xattr:
1934 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1935 break;
26092bf5
TT		 1936 case Opt_sb:
1937 return 1; /* handled by get_sb_block() */
1938 case Opt_removed:
5f3633e3 1939 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1940 return 1;
26092bf5
TT		 1941 case Opt_abort:
1942 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1943 return 1;
1944 case Opt_i_version:
357fdad0 1945 sb->s_flags |= SB_I_VERSION;
26092bf5 1946 return 1;
a26f4992 1947 case Opt_lazytime:
1751e8a6 1948 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1949 return 1;
1950 case Opt_nolazytime:
1751e8a6 1951 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1952 return 1;
26092bf5
TT		 1953 }
1954
5f3633e3
JK		 1955 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1956 if (token == m->token)
1957 break;
1958
1959 if (m->token == Opt_err) {
1960 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1961 "or missing value", opt);
1962 return -1;
1963 }
1964
8dc0aa8c
TT		 1965 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1966 ext4_msg(sb, KERN_ERR,
1967 "Mount option \"%s\" incompatible with ext2", opt);
1968 return -1;
1969 }
1970 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1971 ext4_msg(sb, KERN_ERR,
1972 "Mount option \"%s\" incompatible with ext3", opt);
1973 return -1;
1974 }
1975
ad4eec61 1976 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1977 return -1;
1978 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1979 return -1;
c93cf2d7
DM		 1980 if (m->flags & MOPT_EXPLICIT) {
1981 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1982 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1983 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1984 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1985 } else
1986 return -1;
1987 }
5f3633e3
JK		 1988 if (m->flags & MOPT_CLEAR_ERR)
1989 clear_opt(sb, ERRORS_MASK);
1990 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1991 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1992 "options when quota turned on");
1993 return -1;
1994 }
1995
1996 if (m->flags & MOPT_NOSUPPORT) {
1997 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1998 } else if (token == Opt_commit) {
1999 if (arg == 0)
2000 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
9ba55543 2001 else if (arg > INT_MAX / HZ) {
2002 ext4_msg(sb, KERN_ERR,
2003 "Invalid commit interval %d, "
2004 "must be smaller than %d",
2005 arg, INT_MAX / HZ);
2006 return -1;
2007 }
5f3633e3 2008 sbi->s_commit_interval = HZ * arg;
670e9875 2009 } else if (token == Opt_debug_want_extra_isize) {
9803387c
TT		 2010 if ((arg & 1) ||
2011 (arg < 4) ||
2012 (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
2013 ext4_msg(sb, KERN_ERR,
2014 "Invalid want_extra_isize %d", arg);
2015 return -1;
2016 }
670e9875 2017 sbi->s_want_extra_isize = arg;
5f3633e3 2018 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 2019 sbi->s_max_batch_time = arg;
2020 } else if (token == Opt_min_batch_time) {
2021 sbi->s_min_batch_time = arg;
2022 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 2023 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
2024 ext4_msg(sb, KERN_ERR,
2025 "EXT4-fs: inode_readahead_blks must be "
2026 "0 or a power of 2 smaller than 2^31");
26092bf5 2027 return -1;
5f3633e3
JK		 2028 }
2029 sbi->s_inode_readahead_blks = arg;
2030 } else if (token == Opt_init_itable) {
2031 set_opt(sb, INIT_INODE_TABLE);
2032 if (!args->from)
2033 arg = EXT4_DEF_LI_WAIT_MULT;
2034 sbi->s_li_wait_mult = arg;
2035 } else if (token == Opt_max_dir_size_kb) {
2036 sbi->s_max_dir_size_kb = arg;
2037 } else if (token == Opt_stripe) {
2038 sbi->s_stripe = arg;
2039 } else if (token == Opt_resuid) {
2040 uid = make_kuid(current_user_ns(), arg);
2041 if (!uid_valid(uid)) {
2042 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 2043 return -1;
2044 }
5f3633e3
JK		 2045 sbi->s_resuid = uid;
2046 } else if (token == Opt_resgid) {
2047 gid = make_kgid(current_user_ns(), arg);
2048 if (!gid_valid(gid)) {
2049 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
2050 return -1;
2051 }
2052 sbi->s_resgid = gid;
2053 } else if (token == Opt_journal_dev) {
2054 if (is_remount) {
2055 ext4_msg(sb, KERN_ERR,
2056 "Cannot specify journal on remount");
2057 return -1;
2058 }
2059 *journal_devnum = arg;
ad4eec61
ES		 2060 } else if (token == Opt_journal_path) {
2061 char *journal_path;
2062 struct inode *journal_inode;
2063 struct path path;
2064 int error;
2065
2066 if (is_remount) {
2067 ext4_msg(sb, KERN_ERR,
2068 "Cannot specify journal on remount");
2069 return -1;
2070 }
2071 journal_path = match_strdup(&args[0]);
2072 if (!journal_path) {
2073 ext4_msg(sb, KERN_ERR, "error: could not dup "
2074 "journal device string");
2075 return -1;
2076 }
2077
2078 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
2079 if (error) {
2080 ext4_msg(sb, KERN_ERR, "error: could not find "
2081 "journal device path: error %d", error);
2082 kfree(journal_path);
2083 return -1;
2084 }
2085
2b0143b5 2086 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 2087 if (!S_ISBLK(journal_inode->i_mode)) {
2088 ext4_msg(sb, KERN_ERR, "error: journal path %s "
2089 "is not a block device", journal_path);
2090 path_put(&path);
2091 kfree(journal_path);
2092 return -1;
2093 }
2094
2095 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
2096 path_put(&path);
2097 kfree(journal_path);
5f3633e3
JK		 2098 } else if (token == Opt_journal_ioprio) {
2099 if (arg > 7) {
2100 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
2101 " (must be 0-7)");
2102 return -1;
2103 }
2104 *journal_ioprio =
2105 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447 2106 } else if (token == Opt_test_dummy_encryption) {
ed318a6c
EB		 2107 return ext4_set_test_dummy_encryption(sb, opt, &args[0],
2108 is_remount);
5f3633e3
JK		 2109 } else if (m->flags & MOPT_DATAJ) {
2110 if (is_remount) {
2111 if (!sbi->s_journal)
2112 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2113 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 2114 ext4_msg(sb, KERN_ERR,
26092bf5 2115 "Cannot change data mode on remount");
26092bf5 2116 return -1;
ac27a0ec 2117 }
26092bf5 2118 } else {
5f3633e3
JK		 2119 clear_opt(sb, DATA_FLAGS);
2120 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 2121 }
5f3633e3
JK		 2122#ifdef CONFIG_QUOTA
2123 } else if (m->flags & MOPT_QFMT) {
2124 if (sb_any_quota_loaded(sb) &&
2125 sbi->s_jquota_fmt != m->mount_opt) {
2126 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2127 "quota options when quota turned on");
2128 return -1;
2129 }
e2b911c5 2130 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 2131 ext4_msg(sb, KERN_INFO,
2132 "Quota format mount options ignored "
262b4662 2133 "when QUOTA feature is enabled");
c325a67c 2134 return 1;
262b4662 2135 }
5f3633e3 2136 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 2137#endif
9cb20f94
IW		 2138 } else if (token == Opt_dax || token == Opt_dax_always ||
2139 token == Opt_dax_inode || token == Opt_dax_never) {
ef83b6e8 2140#ifdef CONFIG_FS_DAX
9cb20f94
IW		 2141 switch (token) {
2142 case Opt_dax:
2143 case Opt_dax_always:
829b37b8
TT		 2144 if (is_remount &&
2145 (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2146 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2147 fail_dax_change_remount:
2148 ext4_msg(sb, KERN_ERR, "can't change "
2149 "dax mount option while remounting");
2150 return -1;
2151 }
2152 if (is_remount &&
2153 (test_opt(sb, DATA_FLAGS) ==
2154 EXT4_MOUNT_JOURNAL_DATA)) {
2155 ext4_msg(sb, KERN_ERR, "can't mount with "
2156 "both data=journal and dax");
2157 return -1;
2158 }
9cb20f94
IW		 2159 ext4_msg(sb, KERN_WARNING,
2160 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2161 sbi->s_mount_opt |= EXT4_MOUNT_DAX_ALWAYS;
2162 sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
2163 break;
2164 case Opt_dax_never:
829b37b8
TT		 2165 if (is_remount &&
2166 (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2167 (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS)))
2168 goto fail_dax_change_remount;
9cb20f94
IW		 2169 sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
2170 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
2171 break;
2172 case Opt_dax_inode:
829b37b8
TT		 2173 if (is_remount &&
2174 ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2175 (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2176 !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE)))
2177 goto fail_dax_change_remount;
9cb20f94
IW		 2178 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
2179 sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER;
2180 /* Strictly for printing options */
2181 sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_INODE;
2182 break;
2183 }
ef83b6e8 2184#else
923ae0ff 2185 ext4_msg(sb, KERN_INFO, "dax option not supported");
9cb20f94
IW		 2186 sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER;
2187 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS;
923ae0ff 2188 return -1;
5f3633e3 2189#endif
7915a861
AN		 2190 } else if (token == Opt_data_err_abort) {
2191 sbi->s_mount_opt |= m->mount_opt;
2192 } else if (token == Opt_data_err_ignore) {
2193 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 2194 } else {
2195 if (!args->from)
2196 arg = 1;
2197 if (m->flags & MOPT_CLEAR)
2198 arg = !arg;
2199 else if (unlikely(!(m->flags & MOPT_SET))) {
2200 ext4_msg(sb, KERN_WARNING,
2201 "buggy handling of option %s", opt);
2202 WARN_ON(1);
2203 return -1;
2204 }
2205 if (arg != 0)
2206 sbi->s_mount_opt |= m->mount_opt;
2207 else
2208 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 2209 }
5f3633e3 2210 return 1;
26092bf5
TT		 2211}
2212
2213static int parse_options(char *options, struct super_block *sb,
2214 unsigned long *journal_devnum,
2215 unsigned int *journal_ioprio,
2216 int is_remount)
2217{
1e1a76ed 2218 struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb);
33458eab 2219 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
26092bf5
TT		 2220 substring_t args[MAX_OPT_ARGS];
2221 int token;
2222
2223 if (!options)
2224 return 1;
2225
2226 while ((p = strsep(&options, ",")) != NULL) {
2227 if (!*p)
2228 continue;
2229 /*
2230 * Initialize args struct so we know whether arg was
2231 * found; some options take optional arguments.
2232 */
caecd0af 2233 args[0].to = args[0].from = NULL;
26092bf5
TT		 2234 token = match_token(p, tokens, args);
2235 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2236 journal_ioprio, is_remount) < 0)
2237 return 0;
ac27a0ec
DK		 2238 }
2239#ifdef CONFIG_QUOTA
49da9392
JK		 2240 /*
2241 * We do the test below only for project quotas. 'usrquota' and
2242 * 'grpquota' mount options are allowed even without quota feature
2243 * to support legacy quotas in quota files.
2244 */
2245 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2246 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2247 "Cannot enable project quota enforcement.");
2248 return 0;
2249 }
33458eab
TT		 2250 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2251 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2252 if (usr_qf_name || grp_qf_name) {
2253 if (test_opt(sb, USRQUOTA) && usr_qf_name)
fd8c37ec 2254 clear_opt(sb, USRQUOTA);
ac27a0ec 2255
33458eab 2256 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
fd8c37ec 2257 clear_opt(sb, GRPQUOTA);
ac27a0ec 2258
56c50f11 2259 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 2260 ext4_msg(sb, KERN_ERR, "old and new quota "
2261 "format mixing");
ac27a0ec
DK		 2262 return 0;
2263 }
2264
2265 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 2266 ext4_msg(sb, KERN_ERR, "journaled quota format "
2267 "not specified");
ac27a0ec
DK		 2268 return 0;
2269 }
ac27a0ec
DK		 2270 }
2271#endif
626b035b
RH		 2272 if (test_opt(sb, DIOREAD_NOLOCK)) {
2273 int blocksize =
2274 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2275 if (blocksize < PAGE_SIZE)
2276 ext4_msg(sb, KERN_WARNING, "Warning: mounting with an "
2277 "experimental mount option 'dioread_nolock' "
2278 "for blocksize < PAGE_SIZE");
2279 }
ac27a0ec
DK		 2280 return 1;
2281}
2282
2adf6da8
TT		 2283static inline void ext4_show_quota_options(struct seq_file *seq,
2284 struct super_block *sb)
2285{
2286#if defined(CONFIG_QUOTA)
2287 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2288 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2289
2290 if (sbi->s_jquota_fmt) {
2291 char *fmtname = "";
2292
2293 switch (sbi->s_jquota_fmt) {
2294 case QFMT_VFS_OLD:
2295 fmtname = "vfsold";
2296 break;
2297 case QFMT_VFS_V0:
2298 fmtname = "vfsv0";
2299 break;
2300 case QFMT_VFS_V1:
2301 fmtname = "vfsv1";
2302 break;
2303 }
2304 seq_printf(seq, ",jqfmt=%s", fmtname);
2305 }
2306
33458eab
TT		 2307 rcu_read_lock();
2308 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2309 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2310 if (usr_qf_name)
2311 seq_show_option(seq, "usrjquota", usr_qf_name);
2312 if (grp_qf_name)
2313 seq_show_option(seq, "grpjquota", grp_qf_name);
2314 rcu_read_unlock();
2adf6da8
TT		 2315#endif
2316}
2317
5a916be1
TT		 2318static const char *token2str(int token)
2319{
50df9fd5 2320 const struct match_token *t;
5a916be1
TT		 2321
2322 for (t = tokens; t->token != Opt_err; t++)
2323 if (t->token == token && !strchr(t->pattern, '='))
2324 break;
2325 return t->pattern;
2326}
2327
2adf6da8
TT		 2328/*
2329 * Show an option if
2330 * - it's set to a non-default value OR
2331 * - if the per-sb default is different from the global default
2332 */
66acdcf4
TT		 2333static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2334 int nodefs)
2adf6da8 2335{
2adf6da8
TT		 2336 struct ext4_sb_info *sbi = EXT4_SB(sb);
2337 struct ext4_super_block *es = sbi->s_es;
68afa7e0 2338 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
5a916be1 2339 const struct mount_opts *m;
66acdcf4 2340 char sep = nodefs ? '\n' : ',';
2adf6da8 2341
66acdcf4
TT		 2342#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2343#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2344
2345 if (sbi->s_sb_block != 1)
5a916be1
TT		 2346 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2347
2348 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2349 int want_set = m->flags & MOPT_SET;
2350 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
9cb20f94 2351 (m->flags & MOPT_CLEAR_ERR) || m->flags & MOPT_SKIP)
5a916be1 2352 continue;
68afa7e0 2353 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2354 continue; /* skip if same as the default */
2355 if ((want_set &&
2356 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2357 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2358 continue; /* select Opt_noFoo vs Opt_Foo */
2359 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2360 }
5a916be1 2361
08cefc7a 2362 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2363 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2364 SEQ_OPTS_PRINT("resuid=%u",
2365 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2366 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2367 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2368 SEQ_OPTS_PRINT("resgid=%u",
2369 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2370 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2371 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2372 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2373 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2374 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2375 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2376 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2377 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2378 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2379 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2380 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2381 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2382 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2383 if (sb->s_flags & SB_I_VERSION)
5a916be1 2384 SEQ_OPTS_PUTS("i_version");
66acdcf4 2385 if (nodefs || sbi->s_stripe)
5a916be1 2386 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0
TN		 2387 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2388 (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2389 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2390 SEQ_OPTS_PUTS("data=journal");
2391 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2392 SEQ_OPTS_PUTS("data=ordered");
2393 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2394 SEQ_OPTS_PUTS("data=writeback");
2395 }
66acdcf4
TT		 2396 if (nodefs ||
2397 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2398 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2399 sbi->s_inode_readahead_blks);
2adf6da8 2400
ceec0376 2401 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 2402 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2403 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2404 if (nodefs || sbi->s_max_dir_size_kb)
2405 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2406 if (test_opt(sb, DATA_ERR_ABORT))
2407 SEQ_OPTS_PUTS("data_err=abort");
ed318a6c
EB		 2408
2409 fscrypt_show_test_dummy_encryption(seq, sep, sb);
2adf6da8 2410
9cb20f94
IW		 2411 if (test_opt(sb, DAX_ALWAYS)) {
2412 if (IS_EXT2_SB(sb))
2413 SEQ_OPTS_PUTS("dax");
2414 else
2415 SEQ_OPTS_PUTS("dax=always");
2416 } else if (test_opt2(sb, DAX_NEVER)) {
2417 SEQ_OPTS_PUTS("dax=never");
2418 } else if (test_opt2(sb, DAX_INODE)) {
2419 SEQ_OPTS_PUTS("dax=inode");
2420 }
2421
2adf6da8 2422 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2423 return 0;
2424}
2425
66acdcf4
TT		 2426static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2427{
2428 return _ext4_show_options(seq, root->d_sb, 0);
2429}
2430
ebd173be 2431int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2432{
2433 struct super_block *sb = seq->private;
2434 int rc;
2435
bc98a42c 2436 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2437 rc = _ext4_show_options(seq, sb, 1);
2438 seq_puts(seq, "\n");
2439 return rc;
2440}
2441
617ba13b 2442static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2443 int read_only)
2444{
617ba13b 2445 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 2446 int err = 0;
ac27a0ec 2447
617ba13b 2448 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2449 ext4_msg(sb, KERN_ERR, "revision level too high, "
2450 "forcing read-only mode");
c89128a0 2451 err = -EROFS;
5adaccac 2452 goto done;
ac27a0ec
DK		 2453 }
2454 if (read_only)
281b5995 2455 goto done;
617ba13b 2456 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2457 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2458 "running e2fsck is recommended");
c8b459f4 2459 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2460 ext4_msg(sb, KERN_WARNING,
2461 "warning: mounting fs with errors, "
2462 "running e2fsck is recommended");
ed3ce80a 2463 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2464 le16_to_cpu(es->s_mnt_count) >=
2465 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2466 ext4_msg(sb, KERN_WARNING,
2467 "warning: maximal mount count reached, "
2468 "running e2fsck is recommended");
ac27a0ec 2469 else if (le32_to_cpu(es->s_checkinterval) &&
6a0678a7
AB		 2470 (ext4_get_tstamp(es, s_lastcheck) +
2471 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
b31e1552
ES		 2472 ext4_msg(sb, KERN_WARNING,
2473 "warning: checktime reached, "
2474 "running e2fsck is recommended");
0b8e58a1 2475 if (!sbi->s_journal)
0390131b 2476 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2477 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2478 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2479 le16_add_cpu(&es->s_mnt_count, 1);
6a0678a7 2480 ext4_update_tstamp(es, s_mtime);
0390131b 2481 if (sbi->s_journal)
e2b911c5 2482 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2483
c89128a0 2484 err = ext4_commit_super(sb, 1);
281b5995 2485done:
ac27a0ec 2486 if (test_opt(sb, DEBUG))
a9df9a49 2487 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2488 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2489 sb->s_blocksize,
2490 sbi->s_groups_count,
617ba13b
MC		 2491 EXT4_BLOCKS_PER_GROUP(sb),
2492 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2493 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2494
7abc52c2 2495 cleancache_init_fs(sb);
c89128a0 2496 return err;
ac27a0ec
DK		 2497}
2498
117fff10
TT		 2499int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2500{
2501 struct ext4_sb_info *sbi = EXT4_SB(sb);
7c990728 2502 struct flex_groups **old_groups, **new_groups;
37b0b6b8 2503 int size, i, j;
117fff10
TT		 2504
2505 if (!sbi->s_log_groups_per_flex)
2506 return 0;
2507
2508 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2509 if (size <= sbi->s_flex_groups_allocated)
2510 return 0;
2511
7c990728
SJS		 2512 new_groups = kvzalloc(roundup_pow_of_two(size *
2513 sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
117fff10 2514 if (!new_groups) {
7c990728
SJS		 2515 ext4_msg(sb, KERN_ERR,
2516 "not enough memory for %d flex group pointers", size);
117fff10
TT		 2517 return -ENOMEM;
2518 }
7c990728
SJS		 2519 for (i = sbi->s_flex_groups_allocated; i < size; i++) {
2520 new_groups[i] = kvzalloc(roundup_pow_of_two(
2521 sizeof(struct flex_groups)),
2522 GFP_KERNEL);
2523 if (!new_groups[i]) {
37b0b6b8
DC		 2524 for (j = sbi->s_flex_groups_allocated; j < i; j++)
2525 kvfree(new_groups[j]);
7c990728
SJS		 2526 kvfree(new_groups);
2527 ext4_msg(sb, KERN_ERR,
2528 "not enough memory for %d flex groups", size);
2529 return -ENOMEM;
2530 }
117fff10 2531 }
7c990728
SJS		 2532 rcu_read_lock();
2533 old_groups = rcu_dereference(sbi->s_flex_groups);
2534 if (old_groups)
2535 memcpy(new_groups, old_groups,
2536 (sbi->s_flex_groups_allocated *
2537 sizeof(struct flex_groups *)));
2538 rcu_read_unlock();
2539 rcu_assign_pointer(sbi->s_flex_groups, new_groups);
2540 sbi->s_flex_groups_allocated = size;
2541 if (old_groups)
2542 ext4_kvfree_array_rcu(old_groups);
117fff10
TT		 2543 return 0;
2544}
2545
772cb7c8
JS		 2546static int ext4_fill_flex_info(struct super_block *sb)
2547{
2548 struct ext4_sb_info *sbi = EXT4_SB(sb);
2549 struct ext4_group_desc *gdp = NULL;
7c990728 2550 struct flex_groups *fg;
772cb7c8 2551 ext4_group_t flex_group;
117fff10 2552 int i, err;
772cb7c8 2553
503358ae 2554 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2555 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2556 sbi->s_log_groups_per_flex = 0;
2557 return 1;
2558 }
2559
117fff10
TT		 2560 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2561 if (err)
9933fc0a 2562 goto failed;
772cb7c8 2563
772cb7c8 2564 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2565 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2566
2567 flex_group = ext4_flex_group(sbi, i);
7c990728
SJS		 2568 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
2569 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
90ba983f 2570 atomic64_add(ext4_free_group_clusters(sb, gdp),
7c990728
SJS		 2571 &fg->free_clusters);
2572 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
772cb7c8
JS		 2573 }
2574
2575 return 1;
2576failed:
2577 return 0;
2578}
2579
e2b911c5 2580static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2581 struct ext4_group_desc *gdp)
717d50e4 2582{
b47820ed 2583 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2584 __u16 crc = 0;
feb0ab32 2585 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2586 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2587
9aa5d32b 2588 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2589 /* Use new metadata_csum algorithm */
feb0ab32 2590 __u32 csum32;
b47820ed 2591 __u16 dummy_csum = 0;
feb0ab32 2592
feb0ab32
DW		 2593 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2594 sizeof(le_group));
b47820ed
DJ		 2595 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2596 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2597 sizeof(dummy_csum));
2598 offset += sizeof(dummy_csum);
2599 if (offset < sbi->s_desc_size)
2600 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2601 sbi->s_desc_size - offset);
feb0ab32
DW		 2602
2603 crc = csum32 & 0xFFFF;
2604 goto out;
717d50e4
AD		 2605 }
2606
feb0ab32 2607 /* old crc16 code */
e2b911c5 2608 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2609 return 0;
2610
feb0ab32
DW		 2611 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2612 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2613 crc = crc16(crc, (__u8 *)gdp, offset);
2614 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2615 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2616 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2617 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2618 crc = crc16(crc, (__u8 *)gdp + offset,
2619 le16_to_cpu(sbi->s_es->s_desc_size) -
2620 offset);
2621
2622out:
717d50e4
AD		 2623 return cpu_to_le16(crc);
2624}
2625
feb0ab32 2626int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2627 struct ext4_group_desc *gdp)
2628{
feb0ab32 2629 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2630 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2631 return 0;
2632
2633 return 1;
2634}
2635
feb0ab32
DW		 2636void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2637 struct ext4_group_desc *gdp)
2638{
2639 if (!ext4_has_group_desc_csum(sb))
2640 return;
e2b911c5 2641 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2642}
2643
ac27a0ec 2644/* Called at mount-time, super-block is locked */
bfff6873 2645static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2646 ext4_fsblk_t sb_block,
bfff6873 2647 ext4_group_t *first_not_zeroed)
ac27a0ec 2648{
617ba13b
MC		 2649 struct ext4_sb_info *sbi = EXT4_SB(sb);
2650 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2651 ext4_fsblk_t last_block;
44de022c 2652 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 2653 ext4_fsblk_t block_bitmap;
2654 ext4_fsblk_t inode_bitmap;
2655 ext4_fsblk_t inode_table;
ce421581 2656 int flexbg_flag = 0;
bfff6873 2657 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2658
e2b911c5 2659 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2660 flexbg_flag = 1;
2661
af5bc92d 2662 ext4_debug("Checking group descriptors");
ac27a0ec 2663
197cd65a
AM		 2664 for (i = 0; i < sbi->s_groups_count; i++) {
2665 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2666
ce421581 2667 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2668 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2669 else
2670 last_block = first_block +
617ba13b 2671 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2672
bfff6873
LC		 2673 if ((grp == sbi->s_groups_count) &&
2674 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2675 grp = i;
2676
8fadc143 2677 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2678 if (block_bitmap == sb_block) {
2679 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2680 "Block bitmap for group %u overlaps "
2681 "superblock", i);
18db4b4e
TT		 2682 if (!sb_rdonly(sb))
2683 return 0;
829fa70d 2684 }
77260807
TT		 2685 if (block_bitmap >= sb_block + 1 &&
2686 block_bitmap <= last_bg_block) {
2687 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2688 "Block bitmap for group %u overlaps "
2689 "block group descriptors", i);
2690 if (!sb_rdonly(sb))
2691 return 0;
2692 }
2b2d6d01 2693 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2694 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2695 "Block bitmap for group %u not in group "
b31e1552 2696 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2697 return 0;
2698 }
8fadc143 2699 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2700 if (inode_bitmap == sb_block) {
2701 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2702 "Inode bitmap for group %u overlaps "
2703 "superblock", i);
18db4b4e
TT		 2704 if (!sb_rdonly(sb))
2705 return 0;
829fa70d 2706 }
77260807
TT		 2707 if (inode_bitmap >= sb_block + 1 &&
2708 inode_bitmap <= last_bg_block) {
2709 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2710 "Inode bitmap for group %u overlaps "
2711 "block group descriptors", i);
2712 if (!sb_rdonly(sb))
2713 return 0;
2714 }
2b2d6d01 2715 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2716 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2717 "Inode bitmap for group %u not in group "
b31e1552 2718 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2719 return 0;
2720 }
8fadc143 2721 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2722 if (inode_table == sb_block) {
2723 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2724 "Inode table for group %u overlaps "
2725 "superblock", i);
18db4b4e
TT		 2726 if (!sb_rdonly(sb))
2727 return 0;
829fa70d 2728 }
77260807
TT		 2729 if (inode_table >= sb_block + 1 &&
2730 inode_table <= last_bg_block) {
2731 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2732 "Inode table for group %u overlaps "
2733 "block group descriptors", i);
2734 if (!sb_rdonly(sb))
2735 return 0;
2736 }
bd81d8ee 2737 if (inode_table < first_block ||
2b2d6d01 2738 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2739 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2740 "Inode table for group %u not in group "
b31e1552 2741 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2742 return 0;
2743 }
955ce5f5 2744 ext4_lock_group(sb, i);
feb0ab32 2745 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2746 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2747 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2748 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2749 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2750 if (!sb_rdonly(sb)) {
955ce5f5 2751 ext4_unlock_group(sb, i);
8a266467 2752 return 0;
7ee1ec4c 2753 }
717d50e4 2754 }
955ce5f5 2755 ext4_unlock_group(sb, i);
ce421581
JS		 2756 if (!flexbg_flag)
2757 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2758 }
bfff6873
LC		 2759 if (NULL != first_not_zeroed)
2760 *first_not_zeroed = grp;
ac27a0ec
DK		 2761 return 1;
2762}
2763
617ba13b 2764/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2765 * the superblock) which were deleted from all directories, but held open by
2766 * a process at the time of a crash. We walk the list and try to delete these
2767 * inodes at recovery time (only with a read-write filesystem).
2768 *
2769 * In order to keep the orphan inode chain consistent during traversal (in
2770 * case of crash during recovery), we link each inode into the superblock
2771 * orphan list_head and handle it the same way as an inode deletion during
2772 * normal operation (which journals the operations for us).
2773 *
2774 * We only do an iget() and an iput() on each inode, which is very safe if we
2775 * accidentally point at an in-use or already deleted inode. The worst that
2776 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2777 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2778 * e2fsck was run on this filesystem, and it must have already done the orphan
2779 * inode cleanup for us, so we can safely abort without any further action.
2780 */
2b2d6d01
TT		 2781static void ext4_orphan_cleanup(struct super_block *sb,
2782 struct ext4_super_block *es)
ac27a0ec
DK		 2783{
2784 unsigned int s_flags = sb->s_flags;
2c98eb5e 2785 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2786#ifdef CONFIG_QUOTA
95f1fda4 2787 int quota_update = 0;
ac27a0ec
DK		 2788 int i;
2789#endif
2790 if (!es->s_last_orphan) {
2791 jbd_debug(4, "no orphan inodes to clean up\n");
2792 return;
2793 }
2794
a8f48a95 2795 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2796 ext4_msg(sb, KERN_ERR, "write access "
2797 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2798 return;
2799 }
2800
d39195c3
AG		 2801 /* Check if feature set would not allow a r/w mount */
2802 if (!ext4_feature_set_ok(sb, 0)) {
2803 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2804 "unknown ROCOMPAT features");
2805 return;
2806 }
2807
617ba13b 2808 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2809 /* don't clear list on RO mount w/ errors */
1751e8a6 2810 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2811 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2812 "clearing orphan list.\n");
c25f9bc6
ES		 2813 es->s_last_orphan = 0;
2814 }
ac27a0ec
DK		 2815 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2816 return;
2817 }
2818
1751e8a6 2819 if (s_flags & SB_RDONLY) {
b31e1552 2820 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2821 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2822 }
2823#ifdef CONFIG_QUOTA
2824 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2825 sb->s_flags |= SB_ACTIVE;
95f1fda4 2826
2827 /*
2828 * Turn on quotas which were not enabled for read-only mounts if
2829 * filesystem has quota feature, so that they are updated correctly.
2830 */
1751e8a6 2831 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2832 int ret = ext4_enable_quotas(sb);
2833
2834 if (!ret)
2835 quota_update = 1;
2836 else
2837 ext4_msg(sb, KERN_ERR,
2838 "Cannot turn on quotas: error %d", ret);
2839 }
2840
2841 /* Turn on journaled quotas used for old sytle */
a2d4a646 2842 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2843 if (EXT4_SB(sb)->s_qf_names[i]) {
2844 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2845
2846 if (!ret)
2847 quota_update = 1;
2848 else
b31e1552
ES		 2849 ext4_msg(sb, KERN_ERR,
2850 "Cannot turn on journaled "
95f1fda4 2851 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2852 }
2853 }
2854#endif
2855
2856 while (es->s_last_orphan) {
2857 struct inode *inode;
2858
c65d5c6c
VN		 2859 /*
2860 * We may have encountered an error during cleanup; if
2861 * so, skip the rest.
2862 */
2863 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2864 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2865 es->s_last_orphan = 0;
2866 break;
2867 }
2868
97bd42b9
JB		 2869 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2870 if (IS_ERR(inode)) {
ac27a0ec
DK		 2871 es->s_last_orphan = 0;
2872 break;
2873 }
2874
617ba13b 2875 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2876 dquot_initialize(inode);
ac27a0ec 2877 if (inode->i_nlink) {
566370a2
PT		 2878 if (test_opt(sb, DEBUG))
2879 ext4_msg(sb, KERN_DEBUG,
2880 "%s: truncating inode %lu to %lld bytes",
2881 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2882 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2883 inode->i_ino, inode->i_size);
5955102c 2884 inode_lock(inode);
55f252c9 2885 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2886 ret = ext4_truncate(inode);
2887 if (ret)
2888 ext4_std_error(inode->i_sb, ret);
5955102c 2889 inode_unlock(inode);
ac27a0ec
DK		 2890 nr_truncates++;
2891 } else {
566370a2
PT		 2892 if (test_opt(sb, DEBUG))
2893 ext4_msg(sb, KERN_DEBUG,
2894 "%s: deleting unreferenced inode %lu",
2895 __func__, inode->i_ino);
ac27a0ec
DK		 2896 jbd_debug(2, "deleting unreferenced inode %lu\n",
2897 inode->i_ino);
2898 nr_orphans++;
2899 }
2900 iput(inode); /* The delete magic happens here! */
2901 }
2902
2b2d6d01 2903#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2904
2905 if (nr_orphans)
b31e1552
ES		 2906 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2907 PLURAL(nr_orphans));
ac27a0ec 2908 if (nr_truncates)
b31e1552
ES		 2909 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2910 PLURAL(nr_truncates));
ac27a0ec 2911#ifdef CONFIG_QUOTA
95f1fda4 2912 /* Turn off quotas if they were enabled for orphan cleanup */
2913 if (quota_update) {
2914 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2915 if (sb_dqopt(sb)->files[i])
2916 dquot_quota_off(sb, i);
2917 }
ac27a0ec
DK		 2918 }
2919#endif
1751e8a6 2920 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2921}
0b8e58a1 2922
cd2291a4
ES		 2923/*
2924 * Maximal extent format file size.
2925 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2926 * extent format containers, within a sector_t, and within i_blocks
2927 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2928 * so that won't be a limiting factor.
2929 *
f17722f9
LC		 2930 * However there is other limiting factor. We do store extents in the form
2931 * of starting block and length, hence the resulting length of the extent
2932 * covering maximum file size must fit into on-disk format containers as
2933 * well. Given that length is always by 1 unit bigger than max unit (because
2934 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2935 *
cd2291a4
ES		 2936 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2937 */
f287a1a5 2938static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2939{
2940 loff_t res;
2941 loff_t upper_limit = MAX_LFS_FILESIZE;
2942
72deb455
CH		 2943 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2944
2945 if (!has_huge_files) {
cd2291a4
ES		 2946 upper_limit = (1LL << 32) - 1;
2947
2948 /* total blocks in file system block size */
2949 upper_limit >>= (blkbits - 9);
2950 upper_limit <<= blkbits;
2951 }
2952
f17722f9
LC		 2953 /*
2954 * 32-bit extent-start container, ee_block. We lower the maxbytes
2955 * by one fs block, so ee_len can cover the extent of maximum file
2956 * size
2957 */
2958 res = (1LL << 32) - 1;
cd2291a4 2959 res <<= blkbits;
cd2291a4
ES		 2960
2961 /* Sanity check against vm- & vfs- imposed limits */
2962 if (res > upper_limit)
2963 res = upper_limit;
2964
2965 return res;
2966}
ac27a0ec 2967
ac27a0ec 2968/*
cd2291a4 2969 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2970 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2971 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2972 */
f287a1a5 2973static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2974{
617ba13b 2975 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2976 int meta_blocks;
2977 loff_t upper_limit;
0b8e58a1
AD		 2978 /* This is calculated to be the largest file size for a dense, block
2979 * mapped file such that the file's total number of 512-byte sectors,
2980 * including data and all indirect blocks, does not exceed (2^48 - 1).
2981 *
2982 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2983 * number of 512-byte sectors of the file.
0fc1b451
AK		 2984 */
2985
72deb455 2986 if (!has_huge_files) {
0fc1b451 2987 /*
72deb455
CH		 2988 * !has_huge_files or implies that the inode i_block field
2989 * represents total file blocks in 2^32 512-byte sectors ==
2990 * size of vfs inode i_blocks * 8
0fc1b451
AK		 2991 */
2992 upper_limit = (1LL << 32) - 1;
2993
2994 /* total blocks in file system block size */
2995 upper_limit >>= (bits - 9);
2996
2997 } else {
8180a562
AK		 2998 /*
2999 * We use 48 bit ext4_inode i_blocks
3000 * With EXT4_HUGE_FILE_FL set the i_blocks
3001 * represent total number of blocks in
3002 * file system block size
3003 */
0fc1b451
AK		 3004 upper_limit = (1LL << 48) - 1;
3005
0fc1b451
AK		 3006 }
3007
3008 /* indirect blocks */
3009 meta_blocks = 1;
3010 /* double indirect blocks */
3011 meta_blocks += 1 + (1LL << (bits-2));
3012 /* tripple indirect blocks */
3013 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
3014
3015 upper_limit -= meta_blocks;
3016 upper_limit <<= bits;
ac27a0ec
DK		 3017
3018 res += 1LL << (bits-2);
3019 res += 1LL << (2*(bits-2));
3020 res += 1LL << (3*(bits-2));
3021 res <<= bits;
3022 if (res > upper_limit)
3023 res = upper_limit;
0fc1b451
AK		 3024
3025 if (res > MAX_LFS_FILESIZE)
3026 res = MAX_LFS_FILESIZE;
3027
ac27a0ec
DK		 3028 return res;
3029}
3030
617ba13b 3031static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 3032 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 3033{
617ba13b 3034 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 3035 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 3036 int has_super = 0;
3037
3038 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3039
e2b911c5 3040 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 3041 return logical_sb_block + nr + 1;
ac27a0ec 3042 bg = sbi->s_desc_per_block * nr;
617ba13b 3043 if (ext4_bg_has_super(sb, bg))
ac27a0ec 3044 has_super = 1;
0b8e58a1 3045
bd63f6b0
DW		 3046 /*
3047 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3048 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
3049 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3050 * compensate.
3051 */
3052 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 3053 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 3054 has_super++;
3055
617ba13b 3056 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 3057}
3058
c9de560d
AT		 3059/**
3060 * ext4_get_stripe_size: Get the stripe size.
3061 * @sbi: In memory super block info
3062 *
3063 * If we have specified it via mount option, then
3064 * use the mount option value. If the value specified at mount time is
3065 * greater than the blocks per group use the super block value.
3066 * If the super block value is greater than blocks per group return 0.
3067 * Allocator needs it be less than blocks per group.
3068 *
3069 */
3070static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3071{
3072 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3073 unsigned long stripe_width =
3074 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 3075 int ret;
c9de560d
AT		 3076
3077 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 3078 ret = sbi->s_stripe;
5469d7c3 3079 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 3080 ret = stripe_width;
5469d7c3 3081 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 3082 ret = stride;
3083 else
3084 ret = 0;
c9de560d 3085
3eb08658
DE		 3086 /*
3087 * If the stripe width is 1, this makes no sense and
3088 * we set it to 0 to turn off stripe handling code.
3089 */
3090 if (ret <= 1)
3091 ret = 0;
c9de560d 3092
3eb08658 3093 return ret;
c9de560d 3094}
ac27a0ec 3095
a13fb1a4
ES		 3096/*
3097 * Check whether this filesystem can be mounted based on
3098 * the features present and the RDONLY/RDWR mount requested.
3099 * Returns 1 if this filesystem can be mounted as requested,
3100 * 0 if it cannot be.
3101 */
3102static int ext4_feature_set_ok(struct super_block *sb, int readonly)
3103{
e2b911c5 3104 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 3105 ext4_msg(sb, KERN_ERR,
3106 "Couldn't mount because of "
3107 "unsupported optional features (%x)",
3108 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3109 ~EXT4_FEATURE_INCOMPAT_SUPP));
3110 return 0;
3111 }
3112
c83ad55e
GKB		 3113#ifndef CONFIG_UNICODE
3114 if (ext4_has_feature_casefold(sb)) {
3115 ext4_msg(sb, KERN_ERR,
3116 "Filesystem with casefold feature cannot be "
3117 "mounted without CONFIG_UNICODE");
3118 return 0;
3119 }
3120#endif
3121
a13fb1a4
ES		 3122 if (readonly)
3123 return 1;
3124
e2b911c5 3125 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 3126 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 3127 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 3128 return 1;
3129 }
3130
a13fb1a4 3131 /* Check that feature set is OK for a read-write mount */
e2b911c5 3132 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 3133 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3134 "unsupported optional features (%x)",
3135 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3136 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3137 return 0;
3138 }
e2b911c5 3139 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 3140 ext4_msg(sb, KERN_ERR,
3141 "Can't support bigalloc feature without "
3142 "extents feature\n");
3143 return 0;
3144 }
7c319d32 3145
9db176bc 3146#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
d65d87a0
TT		 3147 if (!readonly && (ext4_has_feature_quota(sb) ||
3148 ext4_has_feature_project(sb))) {
7c319d32 3149 ext4_msg(sb, KERN_ERR,
d65d87a0 3150 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
689c958c
LX		 3151 return 0;
3152 }
7c319d32 3153#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 3154 return 1;
3155}
3156
66e61a9e
TT		 3157/*
3158 * This function is called once a day if we have errors logged
3159 * on the file system
3160 */
235699a8 3161static void print_daily_error_info(struct timer_list *t)
66e61a9e 3162{
235699a8
KC		 3163 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3164 struct super_block *sb = sbi->s_sb;
3165 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 3166
3167 if (es->s_error_count)
ae0f78de
TT		 3168 /* fsck newer than v1.41.13 is needed to clean this condition. */
3169 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 3170 le32_to_cpu(es->s_error_count));
3171 if (es->s_first_error_time) {
6a0678a7
AB		 3172 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3173 sb->s_id,
3174 ext4_get_tstamp(es, s_first_error_time),
66e61a9e
TT		 3175 (int) sizeof(es->s_first_error_func),
3176 es->s_first_error_func,
3177 le32_to_cpu(es->s_first_error_line));
3178 if (es->s_first_error_ino)
651e1c3b 3179 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3180 le32_to_cpu(es->s_first_error_ino));
3181 if (es->s_first_error_block)
651e1c3b 3182 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3183 le64_to_cpu(es->s_first_error_block));
651e1c3b 3184 printk(KERN_CONT "\n");
66e61a9e
TT		 3185 }
3186 if (es->s_last_error_time) {
6a0678a7
AB		 3187 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3188 sb->s_id,
3189 ext4_get_tstamp(es, s_last_error_time),
66e61a9e
TT		 3190 (int) sizeof(es->s_last_error_func),
3191 es->s_last_error_func,
3192 le32_to_cpu(es->s_last_error_line));
3193 if (es->s_last_error_ino)
651e1c3b 3194 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 3195 le32_to_cpu(es->s_last_error_ino));
3196 if (es->s_last_error_block)
651e1c3b 3197 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 3198 le64_to_cpu(es->s_last_error_block));
651e1c3b 3199 printk(KERN_CONT "\n");
66e61a9e
TT		 3200 }
3201 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
3202}
3203
bfff6873
LC		 3204/* Find next suitable group and run ext4_init_inode_table */
3205static int ext4_run_li_request(struct ext4_li_request *elr)
3206{
3207 struct ext4_group_desc *gdp = NULL;
3d392b26
TT		 3208 struct super_block *sb = elr->lr_super;
3209 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3210 ext4_group_t group = elr->lr_next_group;
bfff6873 3211 unsigned long timeout = 0;
3d392b26 3212 unsigned int prefetch_ios = 0;
bfff6873
LC		 3213 int ret = 0;
3214
3d392b26
TT		 3215 if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
3216 elr->lr_next_group = ext4_mb_prefetch(sb, group,
3217 EXT4_SB(sb)->s_mb_prefetch, &prefetch_ios);
3218 if (prefetch_ios)
3219 ext4_mb_prefetch_fini(sb, elr->lr_next_group,
3220 prefetch_ios);
3221 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group,
3222 prefetch_ios);
3223 if (group >= elr->lr_next_group) {
3224 ret = 1;
3225 if (elr->lr_first_not_zeroed != ngroups &&
3226 !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3227 elr->lr_next_group = elr->lr_first_not_zeroed;
3228 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3229 ret = 0;
3230 }
3231 }
3232 return ret;
3233 }
bfff6873 3234
3d392b26 3235 for (; group < ngroups; group++) {
bfff6873
LC		 3236 gdp = ext4_get_group_desc(sb, group, NULL);
3237 if (!gdp) {
3238 ret = 1;
3239 break;
3240 }
3241
3242 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3243 break;
3244 }
3245
7f511862 3246 if (group >= ngroups)
bfff6873
LC		 3247 ret = 1;
3248
3249 if (!ret) {
3250 timeout = jiffies;
3251 ret = ext4_init_inode_table(sb, group,
3252 elr->lr_timeout ? 0 : 1);
3d392b26 3253 trace_ext4_lazy_itable_init(sb, group);
bfff6873 3254 if (elr->lr_timeout == 0) {
51ce6511 3255 timeout = (jiffies - timeout) *
3d392b26 3256 EXT4_SB(elr->lr_super)->s_li_wait_mult;
bfff6873
LC		 3257 elr->lr_timeout = timeout;
3258 }
3259 elr->lr_next_sched = jiffies + elr->lr_timeout;
3260 elr->lr_next_group = group + 1;
3261 }
bfff6873
LC		 3262 return ret;
3263}
3264
3265/*
3266 * Remove lr_request from the list_request and free the
4ed5c033 3267 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 3268 */
3269static void ext4_remove_li_request(struct ext4_li_request *elr)
3270{
bfff6873
LC		 3271 if (!elr)
3272 return;
3273
bfff6873 3274 list_del(&elr->lr_request);
3d392b26 3275 EXT4_SB(elr->lr_super)->s_li_request = NULL;
bfff6873
LC		 3276 kfree(elr);
3277}
3278
3279static void ext4_unregister_li_request(struct super_block *sb)
3280{
1bb933fb
LC		 3281 mutex_lock(&ext4_li_mtx);
3282 if (!ext4_li_info) {
3283 mutex_unlock(&ext4_li_mtx);
bfff6873 3284 return;
1bb933fb 3285 }
bfff6873
LC		 3286
3287 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3288 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3289 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3290 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3291}
3292
8f1f7453
ES		 3293static struct task_struct *ext4_lazyinit_task;
3294
bfff6873
LC		 3295/*
3296 * This is the function where ext4lazyinit thread lives. It walks
3297 * through the request list searching for next scheduled filesystem.
3298 * When such a fs is found, run the lazy initialization request
3299 * (ext4_rn_li_request) and keep track of the time spend in this
3300 * function. Based on that time we compute next schedule time of
3301 * the request. When walking through the list is complete, compute
3302 * next waking time and put itself into sleep.
3303 */
3304static int ext4_lazyinit_thread(void *arg)
3305{
3306 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3307 struct list_head *pos, *n;
3308 struct ext4_li_request *elr;
4ed5c033 3309 unsigned long next_wakeup, cur;
bfff6873
LC		 3310
3311 BUG_ON(NULL == eli);
3312
bfff6873
LC		 3313cont_thread:
3314 while (true) {
3315 next_wakeup = MAX_JIFFY_OFFSET;
3316
3317 mutex_lock(&eli->li_list_mtx);
3318 if (list_empty(&eli->li_request_list)) {
3319 mutex_unlock(&eli->li_list_mtx);
3320 goto exit_thread;
3321 }
bfff6873 3322 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3323 int err = 0;
3324 int progress = 0;
bfff6873
LC		 3325 elr = list_entry(pos, struct ext4_li_request,
3326 lr_request);
3327
e22834f0
DM		 3328 if (time_before(jiffies, elr->lr_next_sched)) {
3329 if (time_before(elr->lr_next_sched, next_wakeup))
3330 next_wakeup = elr->lr_next_sched;
3331 continue;
3332 }
3333 if (down_read_trylock(&elr->lr_super->s_umount)) {
3334 if (sb_start_write_trylock(elr->lr_super)) {
3335 progress = 1;
3336 /*
3337 * We hold sb->s_umount, sb can not
3338 * be removed from the list, it is
3339 * now safe to drop li_list_mtx
3340 */
3341 mutex_unlock(&eli->li_list_mtx);
3342 err = ext4_run_li_request(elr);
3343 sb_end_write(elr->lr_super);
3344 mutex_lock(&eli->li_list_mtx);
3345 n = pos->next;
b2c78cd0 3346 }
e22834f0
DM		 3347 up_read((&elr->lr_super->s_umount));
3348 }
3349 /* error, remove the lazy_init job */
3350 if (err) {
3351 ext4_remove_li_request(elr);
3352 continue;
3353 }
3354 if (!progress) {
3355 elr->lr_next_sched = jiffies +
3356 (prandom_u32()
3357 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3358 }
bfff6873
LC		 3359 if (time_before(elr->lr_next_sched, next_wakeup))
3360 next_wakeup = elr->lr_next_sched;
3361 }
3362 mutex_unlock(&eli->li_list_mtx);
3363
a0acae0e 3364 try_to_freeze();
bfff6873 3365
4ed5c033
LC		 3366 cur = jiffies;
3367 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3368 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3369 cond_resched();
3370 continue;
3371 }
3372
4ed5c033
LC		 3373 schedule_timeout_interruptible(next_wakeup - cur);
3374
8f1f7453
ES		 3375 if (kthread_should_stop()) {
3376 ext4_clear_request_list();
3377 goto exit_thread;
3378 }
bfff6873
LC		 3379 }
3380
3381exit_thread:
3382 /*
3383 * It looks like the request list is empty, but we need
3384 * to check it under the li_list_mtx lock, to prevent any
3385 * additions into it, and of course we should lock ext4_li_mtx
3386 * to atomically free the list and ext4_li_info, because at
3387 * this point another ext4 filesystem could be registering
3388 * new one.
3389 */
3390 mutex_lock(&ext4_li_mtx);
3391 mutex_lock(&eli->li_list_mtx);
3392 if (!list_empty(&eli->li_request_list)) {
3393 mutex_unlock(&eli->li_list_mtx);
3394 mutex_unlock(&ext4_li_mtx);
3395 goto cont_thread;
3396 }
3397 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3398 kfree(ext4_li_info);
3399 ext4_li_info = NULL;
3400 mutex_unlock(&ext4_li_mtx);
3401
3402 return 0;
3403}
3404
3405static void ext4_clear_request_list(void)
3406{
3407 struct list_head *pos, *n;
3408 struct ext4_li_request *elr;
3409
3410 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3411 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3412 elr = list_entry(pos, struct ext4_li_request,
3413 lr_request);
3414 ext4_remove_li_request(elr);
3415 }
3416 mutex_unlock(&ext4_li_info->li_list_mtx);
3417}
3418
3419static int ext4_run_lazyinit_thread(void)
3420{
8f1f7453
ES		 3421 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3422 ext4_li_info, "ext4lazyinit");
3423 if (IS_ERR(ext4_lazyinit_task)) {
3424 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3425 ext4_clear_request_list();
bfff6873
LC		 3426 kfree(ext4_li_info);
3427 ext4_li_info = NULL;
92b97816 3428 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3429 "initialization thread\n",
3430 err);
3431 return err;
3432 }
3433 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3434 return 0;
3435}
3436
3437/*
3438 * Check whether it make sense to run itable init. thread or not.
3439 * If there is at least one uninitialized inode table, return
3440 * corresponding group number, else the loop goes through all
3441 * groups and return total number of groups.
3442 */
3443static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3444{
3445 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3446 struct ext4_group_desc *gdp = NULL;
3447
8844618d
TT		 3448 if (!ext4_has_group_desc_csum(sb))
3449 return ngroups;
3450
bfff6873
LC		 3451 for (group = 0; group < ngroups; group++) {
3452 gdp = ext4_get_group_desc(sb, group, NULL);
3453 if (!gdp)
3454 continue;
3455
50122847 3456 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3457 break;
3458 }
3459
3460 return group;
3461}
3462
3463static int ext4_li_info_new(void)
3464{
3465 struct ext4_lazy_init *eli = NULL;
3466
3467 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3468 if (!eli)
3469 return -ENOMEM;
3470
bfff6873
LC		 3471 INIT_LIST_HEAD(&eli->li_request_list);
3472 mutex_init(&eli->li_list_mtx);
3473
bfff6873
LC		 3474 eli->li_state |= EXT4_LAZYINIT_QUIT;
3475
3476 ext4_li_info = eli;
3477
3478 return 0;
3479}
3480
3481static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3482 ext4_group_t start)
3483{
bfff6873 3484 struct ext4_li_request *elr;
bfff6873
LC		 3485
3486 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3487 if (!elr)
3488 return NULL;
3489
3490 elr->lr_super = sb;
3d392b26
TT		 3491 elr->lr_first_not_zeroed = start;
3492 if (test_opt(sb, PREFETCH_BLOCK_BITMAPS))
3493 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3494 else {
3495 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3496 elr->lr_next_group = start;
3497 }
bfff6873
LC		 3498
3499 /*
3500 * Randomize first schedule time of the request to
3501 * spread the inode table initialization requests
3502 * better.
3503 */
dd1f723b
TT		 3504 elr->lr_next_sched = jiffies + (prandom_u32() %
3505 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3506 return elr;
3507}
3508
7f511862
TT		 3509int ext4_register_li_request(struct super_block *sb,
3510 ext4_group_t first_not_zeroed)
bfff6873
LC		 3511{
3512 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3513 struct ext4_li_request *elr = NULL;
49598e04 3514 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3515 int ret = 0;
bfff6873 3516
7f511862 3517 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3518 if (sbi->s_li_request != NULL) {
3519 /*
3520 * Reset timeout so it can be computed again, because
3521 * s_li_wait_mult might have changed.
3522 */
3523 sbi->s_li_request->lr_timeout = 0;
7f511862 3524 goto out;
51ce6511 3525 }
bfff6873 3526
3d392b26
TT		 3527 if (!test_opt(sb, PREFETCH_BLOCK_BITMAPS) &&
3528 (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3529 !test_opt(sb, INIT_INODE_TABLE)))
7f511862 3530 goto out;
bfff6873
LC		 3531
3532 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3533 if (!elr) {
3534 ret = -ENOMEM;
3535 goto out;
3536 }
bfff6873
LC		 3537
3538 if (NULL == ext4_li_info) {
3539 ret = ext4_li_info_new();
3540 if (ret)
3541 goto out;
3542 }
3543
3544 mutex_lock(&ext4_li_info->li_list_mtx);
3545 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3546 mutex_unlock(&ext4_li_info->li_list_mtx);
3547
3548 sbi->s_li_request = elr;
46e4690b
TM		 3549 /*
3550 * set elr to NULL here since it has been inserted to
3551 * the request_list and the removal and free of it is
3552 * handled by ext4_clear_request_list from now on.
3553 */
3554 elr = NULL;
bfff6873
LC		 3555
3556 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3557 ret = ext4_run_lazyinit_thread();
3558 if (ret)
3559 goto out;
3560 }
bfff6873 3561out:
beed5ecb
NK		 3562 mutex_unlock(&ext4_li_mtx);
3563 if (ret)
bfff6873 3564 kfree(elr);
bfff6873
LC		 3565 return ret;
3566}
3567
3568/*
3569 * We do not need to lock anything since this is called on
3570 * module unload.
3571 */
3572static void ext4_destroy_lazyinit_thread(void)
3573{
3574 /*
3575 * If thread exited earlier
3576 * there's nothing to be done.
3577 */
8f1f7453 3578 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3579 return;
3580
8f1f7453 3581 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3582}
3583
25ed6e8a
DW		 3584static int set_journal_csum_feature_set(struct super_block *sb)
3585{
3586 int ret = 1;
3587 int compat, incompat;
3588 struct ext4_sb_info *sbi = EXT4_SB(sb);
3589
9aa5d32b 3590 if (ext4_has_metadata_csum(sb)) {
db9ee220 3591 /* journal checksum v3 */
25ed6e8a 3592 compat = 0;
db9ee220 3593 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3594 } else {
3595 /* journal checksum v1 */
3596 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3597 incompat = 0;
3598 }
3599
feb8c6d3
DW		 3600 jbd2_journal_clear_features(sbi->s_journal,
3601 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3602 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3603 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3604 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3605 ret = jbd2_journal_set_features(sbi->s_journal,
3606 compat, 0,
3607 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3608 incompat);
3609 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3610 ret = jbd2_journal_set_features(sbi->s_journal,
3611 compat, 0,
3612 incompat);
3613 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3614 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3615 } else {
feb8c6d3
DW		 3616 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3617 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3618 }
3619
3620 return ret;
3621}
3622
952fc18e
TT		 3623/*
3624 * Note: calculating the overhead so we can be compatible with
3625 * historical BSD practice is quite difficult in the face of
3626 * clusters/bigalloc. This is because multiple metadata blocks from
3627 * different block group can end up in the same allocation cluster.
3628 * Calculating the exact overhead in the face of clustered allocation
3629 * requires either O(all block bitmaps) in memory or O(number of block
3630 * groups**2) in time. We will still calculate the superblock for
3631 * older file systems --- and if we come across with a bigalloc file
3632 * system with zero in s_overhead_clusters the estimate will be close to
3633 * correct especially for very large cluster sizes --- but for newer
3634 * file systems, it's better to calculate this figure once at mkfs
3635 * time, and store it in the superblock. If the superblock value is
3636 * present (even for non-bigalloc file systems), we will use it.
3637 */
3638static int count_overhead(struct super_block *sb, ext4_group_t grp,
3639 char *buf)
3640{
3641 struct ext4_sb_info *sbi = EXT4_SB(sb);
3642 struct ext4_group_desc *gdp;
3643 ext4_fsblk_t first_block, last_block, b;
3644 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3645 int s, j, count = 0;
3646
e2b911c5 3647 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3648 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3649 sbi->s_itb_per_group + 2);
3650
952fc18e
TT		 3651 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3652 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3653 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3654 for (i = 0; i < ngroups; i++) {
3655 gdp = ext4_get_group_desc(sb, i, NULL);
3656 b = ext4_block_bitmap(sb, gdp);
3657 if (b >= first_block && b <= last_block) {
3658 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3659 count++;
3660 }
3661 b = ext4_inode_bitmap(sb, gdp);
3662 if (b >= first_block && b <= last_block) {
3663 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3664 count++;
3665 }
3666 b = ext4_inode_table(sb, gdp);
3667 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3668 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3669 int c = EXT4_B2C(sbi, b - first_block);
3670 ext4_set_bit(c, buf);
3671 count++;
3672 }
3673 if (i != grp)
3674 continue;
3675 s = 0;
3676 if (ext4_bg_has_super(sb, grp)) {
3677 ext4_set_bit(s++, buf);
3678 count++;
3679 }
c48ae41b
TT		 3680 j = ext4_bg_num_gdb(sb, grp);
3681 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3682 ext4_error(sb, "Invalid number of block group "
3683 "descriptor blocks: %d", j);
3684 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3685 }
c48ae41b
TT		 3686 count += j;
3687 for (; j > 0; j--)
3688 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3689 }
3690 if (!count)
3691 return 0;
3692 return EXT4_CLUSTERS_PER_GROUP(sb) -
3693 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3694}
3695
3696/*
3697 * Compute the overhead and stash it in sbi->s_overhead
3698 */
3699int ext4_calculate_overhead(struct super_block *sb)
3700{
3701 struct ext4_sb_info *sbi = EXT4_SB(sb);
3702 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3703 struct inode *j_inode;
3704 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3705 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3706 ext4_fsblk_t overhead = 0;
4fdb5543 3707 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3708
952fc18e
TT		 3709 if (!buf)
3710 return -ENOMEM;
3711
3712 /*
3713 * Compute the overhead (FS structures). This is constant
3714 * for a given filesystem unless the number of block groups
3715 * changes so we cache the previous value until it does.
3716 */
3717
3718 /*
3719 * All of the blocks before first_data_block are overhead
3720 */
3721 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3722
3723 /*
3724 * Add the overhead found in each block group
3725 */
3726 for (i = 0; i < ngroups; i++) {
3727 int blks;
3728
3729 blks = count_overhead(sb, i, buf);
3730 overhead += blks;
3731 if (blks)
3732 memset(buf, 0, PAGE_SIZE);
3733 cond_resched();
3734 }
3c816ded
EW		 3735
3736 /*
3737 * Add the internal journal blocks whether the journal has been
3738 * loaded or not
3739 */
b003b524 3740 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3741 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
f1eec3b0
RH		 3742 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
3743 /* j_inum for internal journal is non-zero */
3c816ded
EW		 3744 j_inode = ext4_get_journal_inode(sb, j_inum);
3745 if (j_inode) {
3746 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3747 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3748 iput(j_inode);
3749 } else {
3750 ext4_msg(sb, KERN_ERR, "can't get journal size");
3751 }
3752 }
952fc18e
TT		 3753 sbi->s_overhead = overhead;
3754 smp_wmb();
3755 free_page((unsigned long) buf);
3756 return 0;
3757}
3758
b5799018 3759static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3760{
3761 ext4_fsblk_t resv_clusters;
b5799018 3762 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3763
30fac0f7
JK		 3764 /*
3765 * There's no need to reserve anything when we aren't using extents.
3766 * The space estimates are exact, there are no unwritten extents,
3767 * hole punching doesn't need new metadata... This is needed especially
3768 * to keep ext2/3 backward compatibility.
3769 */
e2b911c5 3770 if (!ext4_has_feature_extents(sb))
b5799018 3771 return;
27dd4385
LC		 3772 /*
3773 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3774 * This should cover the situations where we can not afford to run
3775 * out of space like for example punch hole, or converting
556615dc 3776 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3777 * allocation would require 1, or 2 blocks, higher numbers are
3778 * very rare.
3779 */
b5799018
TT		 3780 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3781 sbi->s_cluster_bits);
27dd4385
LC		 3782
3783 do_div(resv_clusters, 50);
3784 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3785
b5799018 3786 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3787}
3788
2b2d6d01 3789static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3790{
5e405595 3791 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3792 char *orig_data = kstrdup(data, GFP_KERNEL);
1d0c3924 3793 struct buffer_head *bh, **group_desc;
617ba13b 3794 struct ext4_super_block *es = NULL;
5aee0f8a 3795 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
7c990728 3796 struct flex_groups **flex_groups;
617ba13b
MC		 3797 ext4_fsblk_t block;
3798 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3799 ext4_fsblk_t logical_sb_block;
ac27a0ec 3800 unsigned long offset = 0;
ac27a0ec
DK		 3801 unsigned long journal_devnum = 0;
3802 unsigned long def_mount_opts;
3803 struct inode *root;
0390131b 3804 const char *descr;
dcc7dae3 3805 int ret = -ENOMEM;
281b5995 3806 int blocksize, clustersize;
4ec11028
TT		 3807 unsigned int db_count;
3808 unsigned int i;
ef5fd681 3809 int needs_recovery, has_huge_files;
bd81d8ee 3810 __u64 blocks_count;
07aa2ea1 3811 int err = 0;
b3881f74 3812 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3813 ext4_group_t first_not_zeroed;
ac27a0ec 3814
5aee0f8a
TT		 3815 if ((data && !orig_data) || !sbi)
3816 goto out_free_base;
705895b6 3817
aed9eb1b 3818 sbi->s_daxdev = dax_dev;
705895b6
PE		 3819 sbi->s_blockgroup_lock =
3820 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3821 if (!sbi->s_blockgroup_lock)
3822 goto out_free_base;
3823
ac27a0ec 3824 sb->s_fs_info = sbi;
2c0544b2 3825 sbi->s_sb = sb;
240799cd 3826 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3827 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3828 if (sb->s_bdev->bd_part)
3829 sbi->s_sectors_written_start =
dbae2c55 3830 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
ac27a0ec 3831
9f6200bb 3832 /* Cleanup superblock name */
ec3904dc 3833 strreplace(sb->s_id, '/', '!');
9f6200bb 3834
07aa2ea1 3835 /* -EINVAL is default */
dcc7dae3 3836 ret = -EINVAL;
617ba13b 3837 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3838 if (!blocksize) {
b31e1552 3839 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3840 goto out_fail;
3841 }
3842
3843 /*
617ba13b 3844 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3845 * block sizes. We need to calculate the offset from buffer start.
3846 */
617ba13b 3847 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3848 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3849 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3850 } else {
70bbb3e0 3851 logical_sb_block = sb_block;
ac27a0ec
DK		 3852 }
3853
a8ac900b 3854 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3855 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3856 goto out_fail;
3857 }
3858 /*
3859 * Note: s_es must be initialized as soon as possible because
617ba13b 3860 * some ext4 macro-instructions depend on its value
ac27a0ec 3861 */
2716b802 3862 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3863 sbi->s_es = es;
3864 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3865 if (sb->s_magic != EXT4_SUPER_MAGIC)
3866 goto cantfind_ext4;
afc32f7e 3867 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3868
feb0ab32 3869 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3870 if (ext4_has_feature_metadata_csum(sb) &&
3871 ext4_has_feature_gdt_csum(sb))
363307e6 3872 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3873 "redundant flags; please run fsck.");
3874
d25425f8
DW		 3875 /* Check for a known checksum algorithm */
3876 if (!ext4_verify_csum_type(sb, es)) {
3877 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3878 "unknown checksum algorithm.");
3879 silent = 1;
3880 goto cantfind_ext4;
3881 }
3882
0441984a 3883 /* Load the checksum driver */
a45403b5
TT		 3884 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3885 if (IS_ERR(sbi->s_chksum_driver)) {
3886 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3887 ret = PTR_ERR(sbi->s_chksum_driver);
3888 sbi->s_chksum_driver = NULL;
3889 goto failed_mount;
0441984a
DW		 3890 }
3891
a9c47317
DW		 3892 /* Check superblock checksum */
3893 if (!ext4_superblock_csum_verify(sb, es)) {
3894 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3895 "invalid superblock checksum. Run e2fsck?");
3896 silent = 1;
6a797d27 3897 ret = -EFSBADCRC;
a9c47317
DW		 3898 goto cantfind_ext4;
3899 }
3900
3901 /* Precompute checksum seed for all metadata */
e2b911c5 3902 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3903 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3904 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3905 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3906 sizeof(es->s_uuid));
3907
ac27a0ec
DK		 3908 /* Set defaults before we parse the mount options */
3909 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3910 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3911 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3912 set_opt(sb, DEBUG);
87f26807 3913 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3914 set_opt(sb, GRPID);
617ba13b 3915 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3916 set_opt(sb, NO_UID32);
ea663336 3917 /* xattr user namespace & acls are now defaulted on */
ea663336 3918 set_opt(sb, XATTR_USER);
03010a33 3919#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3920 set_opt(sb, POSIX_ACL);
2e7842b8 3921#endif
98c1a759
DW		 3922 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3923 if (ext4_has_metadata_csum(sb))
3924 set_opt(sb, JOURNAL_CHECKSUM);
3925
617ba13b 3926 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3927 set_opt(sb, JOURNAL_DATA);
617ba13b 3928 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3929 set_opt(sb, ORDERED_DATA);
617ba13b 3930 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3931 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3932
3933 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3934 set_opt(sb, ERRORS_PANIC);
bb4f397a 3935 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3936 set_opt(sb, ERRORS_CONT);
bb4f397a 3937 else
fd8c37ec 3938 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3939 /* block_validity enabled by default; disable with noblock_validity */
3940 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3941 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3942 set_opt(sb, DISCARD);
ac27a0ec 3943
08cefc7a
EB		 3944 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3945 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3946 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3947 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3948 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3949
8b67f04a 3950 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3951 set_opt(sb, BARRIER);
ac27a0ec 3952
dd919b98
AK		 3953 /*
3954 * enable delayed allocation by default
3955 * Use -o nodelalloc to turn it off
3956 */
bc0b75f7 3957 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3958 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3959 set_opt(sb, DELALLOC);
dd919b98 3960
51ce6511
LC		 3961 /*
3962 * set default s_li_wait_mult for lazyinit, for the case there is
3963 * no mount option specified.
3964 */
3965 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3966
4f97a681 3967 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
626b035b
RH		 3968
3969 if (blocksize == PAGE_SIZE)
3970 set_opt(sb, DIOREAD_NOLOCK);
3971
4f97a681
TT		 3972 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3973 blocksize > EXT4_MAX_BLOCK_SIZE) {
3974 ext4_msg(sb, KERN_ERR,
3975 "Unsupported filesystem blocksize %d (%d log_block_size)",
3976 blocksize, le32_to_cpu(es->s_log_block_size));
3977 goto failed_mount;
3978 }
3979
9803387c
TT		 3980 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3981 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3982 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3983 } else {
3984 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3985 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3986 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3987 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3988 sbi->s_first_ino);
3989 goto failed_mount;
3990 }
3991 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3992 (!is_power_of_2(sbi->s_inode_size)) ||
3993 (sbi->s_inode_size > blocksize)) {
3994 ext4_msg(sb, KERN_ERR,
3995 "unsupported inode size: %d",
3996 sbi->s_inode_size);
4f97a681 3997 ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
9803387c
TT		 3998 goto failed_mount;
3999 }
4000 /*
4001 * i_atime_extra is the last extra field available for
4002 * [acm]times in struct ext4_inode. Checking for that
4003 * field should suffice to ensure we have extra space
4004 * for all three.
4005 */
4006 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4007 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4008 sb->s_time_gran = 1;
4009 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4010 } else {
4011 sb->s_time_gran = NSEC_PER_SEC;
4012 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4013 }
4014 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4015 }
4016 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4017 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4018 EXT4_GOOD_OLD_INODE_SIZE;
4019 if (ext4_has_feature_extra_isize(sb)) {
4020 unsigned v, max = (sbi->s_inode_size -
4021 EXT4_GOOD_OLD_INODE_SIZE);
4022
4023 v = le16_to_cpu(es->s_want_extra_isize);
4024 if (v > max) {
4025 ext4_msg(sb, KERN_ERR,
4026 "bad s_want_extra_isize: %d", v);
4027 goto failed_mount;
4028 }
4029 if (sbi->s_want_extra_isize < v)
4030 sbi->s_want_extra_isize = v;
4031
4032 v = le16_to_cpu(es->s_min_extra_isize);
4033 if (v > max) {
4034 ext4_msg(sb, KERN_ERR,
4035 "bad s_min_extra_isize: %d", v);
4036 goto failed_mount;
4037 }
4038 if (sbi->s_want_extra_isize < v)
4039 sbi->s_want_extra_isize = v;
4040 }
4041 }
4042
5aee0f8a
TT		 4043 if (sbi->s_es->s_mount_opts[0]) {
4044 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
4045 sizeof(sbi->s_es->s_mount_opts),
4046 GFP_KERNEL);
4047 if (!s_mount_opts)
4048 goto failed_mount;
4049 if (!parse_options(s_mount_opts, sb, &journal_devnum,
4050 &journal_ioprio, 0)) {
4051 ext4_msg(sb, KERN_WARNING,
4052 "failed to parse options in superblock: %s",
4053 s_mount_opts);
4054 }
4055 kfree(s_mount_opts);
8b67f04a 4056 }
5a916be1 4057 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 4058 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 4059 &journal_ioprio, 0))
ac27a0ec
DK		 4060 goto failed_mount;
4061
c83ad55e
GKB		 4062#ifdef CONFIG_UNICODE
4063 if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
4064 const struct ext4_sb_encodings *encoding_info;
4065 struct unicode_map *encoding;
4066 __u16 encoding_flags;
4067
4068 if (ext4_has_feature_encrypt(sb)) {
4069 ext4_msg(sb, KERN_ERR,
4070 "Can't mount with encoding and encryption");
4071 goto failed_mount;
4072 }
4073
4074 if (ext4_sb_read_encoding(es, &encoding_info,
4075 &encoding_flags)) {
4076 ext4_msg(sb, KERN_ERR,
4077 "Encoding requested by superblock is unknown");
4078 goto failed_mount;
4079 }
4080
4081 encoding = utf8_load(encoding_info->version);
4082 if (IS_ERR(encoding)) {
4083 ext4_msg(sb, KERN_ERR,
4084 "can't mount with superblock charset: %s-%s "
4085 "not supported by the kernel. flags: 0x%x.",
4086 encoding_info->name, encoding_info->version,
4087 encoding_flags);
4088 goto failed_mount;
4089 }
4090 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4091 "%s-%s with flags 0x%hx", encoding_info->name,
4092 encoding_info->version?:"\b", encoding_flags);
4093
4094 sbi->s_encoding = encoding;
4095 sbi->s_encoding_flags = encoding_flags;
4096 }
4097#endif
4098
56889787 4099 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
244adf64 4100 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, and O_DIRECT support!\n");
781c036b 4101 /* can't mount with both data=journal and dioread_nolock. */
244adf64 4102 clear_opt(sb, DIOREAD_NOLOCK);
56889787
TT		 4103 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4104 ext4_msg(sb, KERN_ERR, "can't mount with "
4105 "both data=journal and delalloc");
4106 goto failed_mount;
4107 }
fc626fe3 4108 if (test_opt(sb, DAX_ALWAYS)) {
923ae0ff
RZ		 4109 ext4_msg(sb, KERN_ERR, "can't mount with "
4110 "both data=journal and dax");
4111 goto failed_mount;
4112 }
73b92a2a
SK		 4113 if (ext4_has_feature_encrypt(sb)) {
4114 ext4_msg(sb, KERN_WARNING,
4115 "encrypted files will use data=ordered "
4116 "instead of data journaling mode");
4117 }
56889787
TT		 4118 if (test_opt(sb, DELALLOC))
4119 clear_opt(sb, DELALLOC);
001e4a87
TH		 4120 } else {
4121 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 4122 }
4123
1751e8a6
LT		 4124 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
4125 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 4126
617ba13b 4127 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 4128 (ext4_has_compat_features(sb) ||
4129 ext4_has_ro_compat_features(sb) ||
4130 ext4_has_incompat_features(sb)))
b31e1552
ES		 4131 ext4_msg(sb, KERN_WARNING,
4132 "feature flags set on rev 0 fs, "
4133 "running e2fsck is recommended");
469108ff 4134
ed3654eb
TT		 4135 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4136 set_opt2(sb, HURD_COMPAT);
e2b911c5 4137 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 4138 ext4_msg(sb, KERN_ERR,
4139 "The Hurd can't support 64-bit file systems");
4140 goto failed_mount;
4141 }
dec214d0
TE		 4142
4143 /*
4144 * ea_inode feature uses l_i_version field which is not
4145 * available in HURD_COMPAT mode.
4146 */
4147 if (ext4_has_feature_ea_inode(sb)) {
4148 ext4_msg(sb, KERN_ERR,
4149 "ea_inode feature is not supported for Hurd");
4150 goto failed_mount;
4151 }
ed3654eb
TT		 4152 }
4153
2035e776
TT		 4154 if (IS_EXT2_SB(sb)) {
4155 if (ext2_feature_set_ok(sb))
4156 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4157 "using the ext4 subsystem");
4158 else {
0d9366d6
ES		 4159 /*
4160 * If we're probing be silent, if this looks like
4161 * it's actually an ext[34] filesystem.
4162 */
4163 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4164 goto failed_mount;
2035e776
TT		 4165 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4166 "to feature incompatibilities");
4167 goto failed_mount;
4168 }
4169 }
4170
4171 if (IS_EXT3_SB(sb)) {
4172 if (ext3_feature_set_ok(sb))
4173 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4174 "using the ext4 subsystem");
4175 else {
0d9366d6
ES		 4176 /*
4177 * If we're probing be silent, if this looks like
4178 * it's actually an ext4 filesystem.
4179 */
4180 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4181 goto failed_mount;
2035e776
TT		 4182 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4183 "to feature incompatibilities");
4184 goto failed_mount;
4185 }
4186 }
4187
ac27a0ec
DK		 4188 /*
4189 * Check feature flags regardless of the revision level, since we
4190 * previously didn't change the revision level when setting the flags,
4191 * so there is a chance incompat flags are set on a rev 0 filesystem.
4192 */
bc98a42c 4193 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 4194 goto failed_mount;
a13fb1a4 4195
8cdf3372
TT		 4196 if (le32_to_cpu(es->s_log_block_size) >
4197 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4198 ext4_msg(sb, KERN_ERR,
4199 "Invalid log block size: %u",
4200 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 4201 goto failed_mount;
4202 }
bfe0a5f4
TT		 4203 if (le32_to_cpu(es->s_log_cluster_size) >
4204 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4205 ext4_msg(sb, KERN_ERR,
4206 "Invalid log cluster size: %u",
4207 le32_to_cpu(es->s_log_cluster_size));
4208 goto failed_mount;
4209 }
ac27a0ec 4210
5b9554dc
TT		 4211 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4212 ext4_msg(sb, KERN_ERR,
4213 "Number of reserved GDT blocks insanely large: %d",
4214 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4215 goto failed_mount;
4216 }
4217
a8ab6d38
IW		 4218 if (bdev_dax_supported(sb->s_bdev, blocksize))
4219 set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4220
fc626fe3 4221 if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
559db4c6
RZ		 4222 if (ext4_has_feature_inline_data(sb)) {
4223 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4224 " that may contain inline data");
361d24d4 4225 goto failed_mount;
559db4c6 4226 }
a8ab6d38 4227 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
24f3478d 4228 ext4_msg(sb, KERN_ERR,
361d24d4
ES		 4229 "DAX unsupported by block device.");
4230 goto failed_mount;
24f3478d 4231 }
923ae0ff
RZ		 4232 }
4233
e2b911c5 4234 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 4235 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4236 es->s_encryption_level);
4237 goto failed_mount;
4238 }
4239
ac27a0ec 4240 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 4241 /* Validate the filesystem blocksize */
4242 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 4243 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 4244 blocksize);
ac27a0ec
DK		 4245 goto failed_mount;
4246 }
4247
2b2d6d01 4248 brelse(bh);
70bbb3e0
AM		 4249 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4250 offset = do_div(logical_sb_block, blocksize);
a8ac900b 4251 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 4252 if (!bh) {
b31e1552
ES		 4253 ext4_msg(sb, KERN_ERR,
4254 "Can't read superblock on 2nd try");
ac27a0ec
DK		 4255 goto failed_mount;
4256 }
2716b802 4257 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 4258 sbi->s_es = es;
617ba13b 4259 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 4260 ext4_msg(sb, KERN_ERR,
4261 "Magic mismatch, very weird!");
ac27a0ec
DK		 4262 goto failed_mount;
4263 }
4264 }
4265
e2b911c5 4266 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 4267 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4268 has_huge_files);
4269 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 4270
0d1ee42f 4271 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 4272 if (ext4_has_feature_64bit(sb)) {
8fadc143 4273 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 4274 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 4275 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 4276 ext4_msg(sb, KERN_ERR,
4277 "unsupported descriptor size %lu",
0d1ee42f
AR		 4278 sbi->s_desc_size);
4279 goto failed_mount;
4280 }
4281 } else
4282 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 4283
ac27a0ec 4284 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 4285 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 4286
617ba13b 4287 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 4288 if (sbi->s_inodes_per_block == 0)
617ba13b 4289 goto cantfind_ext4;
cd6bb35b
TT		 4290 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4291 sbi->s_inodes_per_group > blocksize * 8) {
4292 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
b9c538da 4293 sbi->s_inodes_per_group);
cd6bb35b
TT		 4294 goto failed_mount;
4295 }
ac27a0ec
DK		 4296 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4297 sbi->s_inodes_per_block;
0d1ee42f 4298 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 4299 sbi->s_sbh = bh;
4300 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 4301 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4302 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 4303
2b2d6d01 4304 for (i = 0; i < 4; i++)
ac27a0ec
DK		 4305 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4306 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 4307 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 4308 i = le32_to_cpu(es->s_flags);
4309 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4310 sbi->s_hash_unsigned = 3;
4311 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 4312#ifdef __CHAR_UNSIGNED__
bc98a42c 4313 if (!sb_rdonly(sb))
23301410
TT		 4314 es->s_flags |=
4315 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4316 sbi->s_hash_unsigned = 3;
f99b2589 4317#else
bc98a42c 4318 if (!sb_rdonly(sb))
23301410
TT		 4319 es->s_flags |=
4320 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 4321#endif
23301410 4322 }
f99b2589 4323 }
ac27a0ec 4324
281b5995
TT		 4325 /* Handle clustersize */
4326 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
ef5fd681 4327 if (ext4_has_feature_bigalloc(sb)) {
281b5995
TT		 4328 if (clustersize < blocksize) {
4329 ext4_msg(sb, KERN_ERR,
4330 "cluster size (%d) smaller than "
4331 "block size (%d)", clustersize, blocksize);
4332 goto failed_mount;
4333 }
4334 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4335 le32_to_cpu(es->s_log_block_size);
4336 sbi->s_clusters_per_group =
4337 le32_to_cpu(es->s_clusters_per_group);
4338 if (sbi->s_clusters_per_group > blocksize * 8) {
4339 ext4_msg(sb, KERN_ERR,
4340 "#clusters per group too big: %lu",
4341 sbi->s_clusters_per_group);
4342 goto failed_mount;
4343 }
4344 if (sbi->s_blocks_per_group !=
4345 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4346 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4347 "clusters per group (%lu) inconsistent",
4348 sbi->s_blocks_per_group,
4349 sbi->s_clusters_per_group);
4350 goto failed_mount;
4351 }
4352 } else {
4353 if (clustersize != blocksize) {
bfe0a5f4
TT		 4354 ext4_msg(sb, KERN_ERR,
4355 "fragment/cluster size (%d) != "
4356 "block size (%d)", clustersize, blocksize);
4357 goto failed_mount;
281b5995
TT		 4358 }
4359 if (sbi->s_blocks_per_group > blocksize * 8) {
4360 ext4_msg(sb, KERN_ERR,
4361 "#blocks per group too big: %lu",
4362 sbi->s_blocks_per_group);
4363 goto failed_mount;
4364 }
4365 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4366 sbi->s_cluster_bits = 0;
ac27a0ec 4367 }
281b5995
TT		 4368 sbi->s_cluster_ratio = clustersize / blocksize;
4369
960fd856
TT		 4370 /* Do we have standard group size of clustersize * 8 blocks ? */
4371 if (sbi->s_blocks_per_group == clustersize << 3)
4372 set_opt2(sb, STD_GROUP_SIZE);
4373
bf43d84b
ES		 4374 /*
4375 * Test whether we have more sectors than will fit in sector_t,
4376 * and whether the max offset is addressable by the page cache.
4377 */
5a9ae68a 4378 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 4379 ext4_blocks_count(es));
5a9ae68a 4380 if (err) {
b31e1552 4381 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 4382 " too large to mount safely on this system");
ac27a0ec
DK		 4383 goto failed_mount;
4384 }
4385
617ba13b
MC		 4386 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4387 goto cantfind_ext4;
e7c95593 4388
0f2ddca6
FTN		 4389 /* check blocks count against device size */
4390 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4391 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 4392 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4393 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 4394 ext4_blocks_count(es), blocks_count);
4395 goto failed_mount;
4396 }
4397
0b8e58a1
AD		 4398 /*
4399 * It makes no sense for the first data block to be beyond the end
4400 * of the filesystem.
4401 */
4402 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 4403 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 4404 "block %u is beyond end of filesystem (%llu)",
4405 le32_to_cpu(es->s_first_data_block),
4406 ext4_blocks_count(es));
e7c95593
ES		 4407 goto failed_mount;
4408 }
bfe0a5f4
TT		 4409 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4410 (sbi->s_cluster_ratio == 1)) {
4411 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4412 "block is 0 with a 1k block and cluster size");
4413 goto failed_mount;
4414 }
4415
bd81d8ee
LV		 4416 blocks_count = (ext4_blocks_count(es) -
4417 le32_to_cpu(es->s_first_data_block) +
4418 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4419 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 4420 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
df41460a 4421 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4ec11028 4422 "(block count %llu, first data block %u, "
df41460a 4423 "blocks per group %lu)", blocks_count,
4ec11028
TT		 4424 ext4_blocks_count(es),
4425 le32_to_cpu(es->s_first_data_block),
4426 EXT4_BLOCKS_PER_GROUP(sb));
4427 goto failed_mount;
4428 }
bd81d8ee 4429 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 4430 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4431 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
9e463084
TT		 4432 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4433 le32_to_cpu(es->s_inodes_count)) {
4434 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4435 le32_to_cpu(es->s_inodes_count),
4436 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4437 ret = -EINVAL;
4438 goto failed_mount;
4439 }
617ba13b
MC		 4440 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4441 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 4442 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 4443 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 4444 ext4_msg(sb, KERN_WARNING,
4445 "first meta block group too large: %u "
4446 "(group descriptor block count %u)",
4447 le32_to_cpu(es->s_first_meta_bg), db_count);
4448 goto failed_mount;
4449 }
4450 }
1d0c3924
TT		 4451 rcu_assign_pointer(sbi->s_group_desc,
4452 kvmalloc_array(db_count,
4453 sizeof(struct buffer_head *),
4454 GFP_KERNEL));
ac27a0ec 4455 if (sbi->s_group_desc == NULL) {
b31e1552 4456 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4457 ret = -ENOMEM;
ac27a0ec
DK		 4458 goto failed_mount;
4459 }
4460
705895b6 4461 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4462
85c8f176
AP		 4463 /* Pre-read the descriptors into the buffer cache */
4464 for (i = 0; i < db_count; i++) {
4465 block = descriptor_loc(sb, logical_sb_block, i);
d87f6392 4466 sb_breadahead_unmovable(sb, block);
85c8f176
AP		 4467 }
4468
ac27a0ec 4469 for (i = 0; i < db_count; i++) {
1d0c3924
TT		 4470 struct buffer_head *bh;
4471
70bbb3e0 4472 block = descriptor_loc(sb, logical_sb_block, i);
1d0c3924
TT		 4473 bh = sb_bread_unmovable(sb, block);
4474 if (!bh) {
b31e1552
ES		 4475 ext4_msg(sb, KERN_ERR,
4476 "can't read group descriptor %d", i);
ac27a0ec
DK		 4477 db_count = i;
4478 goto failed_mount2;
4479 }
1d0c3924
TT		 4480 rcu_read_lock();
4481 rcu_dereference(sbi->s_group_desc)[i] = bh;
4482 rcu_read_unlock();
ac27a0ec 4483 }
44de022c 4484 sbi->s_gdb_count = db_count;
829fa70d 4485 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4486 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4487 ret = -EFSCORRUPTED;
f9ae9cf5 4488 goto failed_mount2;
ac27a0ec 4489 }
772cb7c8 4490
235699a8 4491 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 4492
a75ae78f 4493 /* Register extent status tree shrinker */
eb68d0e2 4494 if (ext4_es_register_shrinker(sbi))
ce7e010a 4495 goto failed_mount3;
ce7e010a 4496
c9de560d 4497 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4498 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4499
f9ae9cf5
TT		 4500 /*
4501 * set up enough so that it can read an inode
4502 */
f6e63f90 4503 sb->s_op = &ext4_sops;
617ba13b
MC		 4504 sb->s_export_op = &ext4_export_ops;
4505 sb->s_xattr = ext4_xattr_handlers;
643fa961 4506#ifdef CONFIG_FS_ENCRYPTION
a7550b30 4507 sb->s_cop = &ext4_cryptops;
ffcc4182 4508#endif
c93d8f88
EB		 4509#ifdef CONFIG_FS_VERITY
4510 sb->s_vop = &ext4_verityops;
4511#endif
ac27a0ec 4512#ifdef CONFIG_QUOTA
617ba13b 4513 sb->dq_op = &ext4_quota_operations;
e2b911c5 4514 if (ext4_has_feature_quota(sb))
1fa5efe3 4515 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4516 else
4517 sb->s_qcop = &ext4_qctl_operations;
689c958c 4518 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4519#endif
85787090 4520 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4521
ac27a0ec 4522 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4523 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4524
4525 sb->s_root = NULL;
4526
4527 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4528 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4529
bc98a42c 4530 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4531 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4532 goto failed_mount3a;
c5e06d10 4533
ac27a0ec
DK		 4534 /*
4535 * The first inode we look at is the journal inode. Don't try
4536 * root first: it may be modified in the journal!
4537 */
e2b911c5 4538 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4539 err = ext4_load_journal(sb, es, journal_devnum);
4540 if (err)
50460fe8 4541 goto failed_mount3a;
bc98a42c 4542 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4543 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4544 ext4_msg(sb, KERN_ERR, "required journal recovery "
4545 "suppressed and not mounted read-only");
744692dc 4546 goto failed_mount_wq;
ac27a0ec 4547 } else {
1e381f60
DM		 4548 /* Nojournal mode, all journal mount options are illegal */
4549 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4550 ext4_msg(sb, KERN_ERR, "can't mount with "
4551 "journal_checksum, fs mounted w/o journal");
4552 goto failed_mount_wq;
4553 }
4554 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4555 ext4_msg(sb, KERN_ERR, "can't mount with "
4556 "journal_async_commit, fs mounted w/o journal");
4557 goto failed_mount_wq;
4558 }
4559 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4560 ext4_msg(sb, KERN_ERR, "can't mount with "
4561 "commit=%lu, fs mounted w/o journal",
4562 sbi->s_commit_interval / HZ);
4563 goto failed_mount_wq;
4564 }
4565 if (EXT4_MOUNT_DATA_FLAGS &
4566 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4567 ext4_msg(sb, KERN_ERR, "can't mount with "
4568 "data=, fs mounted w/o journal");
4569 goto failed_mount_wq;
4570 }
50b29d8f 4571 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
1e381f60 4572 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4573 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4574 sbi->s_journal = NULL;
4575 needs_recovery = 0;
4576 goto no_journal;
ac27a0ec
DK		 4577 }
4578
e2b911c5 4579 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4580 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4581 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4582 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4583 goto failed_mount_wq;
eb40a09c
JS		 4584 }
4585
25ed6e8a
DW		 4586 if (!set_journal_csum_feature_set(sb)) {
4587 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4588 "feature set");
4589 goto failed_mount_wq;
d4da6c9c 4590 }
818d276c 4591
ac27a0ec
DK		 4592 /* We have now updated the journal if required, so we can
4593 * validate the data journaling mode. */
4594 switch (test_opt(sb, DATA_FLAGS)) {
4595 case 0:
4596 /* No mode set, assume a default based on the journal
63f57933
AM		 4597 * capabilities: ORDERED_DATA if the journal can
4598 * cope, else JOURNAL_DATA
4599 */
dab291af 4600 if (jbd2_journal_check_available_features
27f394a7 4601 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
fd8c37ec 4602 set_opt(sb, ORDERED_DATA);
27f394a7
TN		 4603 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4604 } else {
fd8c37ec 4605 set_opt(sb, JOURNAL_DATA);
27f394a7
TN		 4606 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4607 }
ac27a0ec
DK		 4608 break;
4609
617ba13b
MC		 4610 case EXT4_MOUNT_ORDERED_DATA:
4611 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4612 if (!jbd2_journal_check_available_features
4613 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4614 ext4_msg(sb, KERN_ERR, "Journal does not support "
4615 "requested data journaling mode");
744692dc 4616 goto failed_mount_wq;
ac27a0ec
DK		 4617 }
4618 default:
4619 break;
4620 }
ab04df78
JK		 4621
4622 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4623 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4624 ext4_msg(sb, KERN_ERR, "can't mount with "
4625 "journal_async_commit in data=ordered mode");
4626 goto failed_mount_wq;
4627 }
4628
b3881f74 4629 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4630
18aadd47
BJ		 4631 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4632
ce7e010a 4633no_journal:
cdb7ee4c
TE		 4634 if (!test_opt(sb, NO_MBCACHE)) {
4635 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4636 if (!sbi->s_ea_block_cache) {
dec214d0 4637 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4638 "Failed to create ea_block_cache");
dec214d0
TE		 4639 goto failed_mount_wq;
4640 }
cdb7ee4c
TE		 4641
4642 if (ext4_has_feature_ea_inode(sb)) {
4643 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4644 if (!sbi->s_ea_inode_cache) {
4645 ext4_msg(sb, KERN_ERR,
4646 "Failed to create ea_inode_cache");
4647 goto failed_mount_wq;
4648 }
4649 }
9c191f70
M		 4650 }
4651
c93d8f88
EB		 4652 if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4653 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4654 goto failed_mount_wq;
4655 }
4656
bc98a42c 4657 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4658 !ext4_has_feature_encrypt(sb)) {
4659 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4660 ext4_commit_super(sb, 1);
4661 }
4662
952fc18e
TT		 4663 /*
4664 * Get the # of file system overhead blocks from the
4665 * superblock if present.
4666 */
4667 if (es->s_overhead_clusters)
4668 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4669 else {
07aa2ea1
LC		 4670 err = ext4_calculate_overhead(sb);
4671 if (err)
952fc18e
TT		 4672 goto failed_mount_wq;
4673 }
4674
fd89d5f2
TH		 4675 /*
4676 * The maximum number of concurrent works can be high and
4677 * concurrency isn't really necessary. Limit it to 1.
4678 */
2e8fa54e
JK		 4679 EXT4_SB(sb)->rsv_conversion_wq =
4680 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4681 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4682 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4683 ret = -ENOMEM;
2e8fa54e
JK		 4684 goto failed_mount4;
4685 }
4686
ac27a0ec 4687 /*
dab291af 4688 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4689 * so we can safely mount the rest of the filesystem now.
4690 */
4691
8a363970 4692 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 4693 if (IS_ERR(root)) {
b31e1552 4694 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4695 ret = PTR_ERR(root);
32a9bb57 4696 root = NULL;
ac27a0ec
DK		 4697 goto failed_mount4;
4698 }
4699 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4700 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4701 iput(root);
ac27a0ec
DK		 4702 goto failed_mount4;
4703 }
b886ee3e
GKB		 4704
4705#ifdef CONFIG_UNICODE
4706 if (sbi->s_encoding)
4707 sb->s_d_op = &ext4_dentry_ops;
4708#endif
4709
48fde701 4710 sb->s_root = d_make_root(root);
1d1fe1ee 4711 if (!sb->s_root) {
b31e1552 4712 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4713 ret = -ENOMEM;
4714 goto failed_mount4;
4715 }
ac27a0ec 4716
c89128a0
JK		 4717 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4718 if (ret == -EROFS) {
1751e8a6 4719 sb->s_flags |= SB_RDONLY;
c89128a0
JK		 4720 ret = 0;
4721 } else if (ret)
4722 goto failed_mount4a;
ef7f3835 4723
b5799018 4724 ext4_set_resv_clusters(sb);
27dd4385 4725
6fd058f7
TT		 4726 err = ext4_setup_system_zone(sb);
4727 if (err) {
b31e1552 4728 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4729 "zone (%d)", err);
f9ae9cf5
TT		 4730 goto failed_mount4a;
4731 }
4732
4733 ext4_ext_init(sb);
4734 err = ext4_mb_init(sb);
4735 if (err) {
4736 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4737 err);
dcf2d804 4738 goto failed_mount5;
c2774d84
AK		 4739 }
4740
d5e03cbb
TT		 4741 block = ext4_count_free_clusters(sb);
4742 ext4_free_blocks_count_set(sbi->s_es,
4743 EXT4_C2B(sbi, block));
4274f516 4744 ext4_superblock_csum_set(sb);
908c7f19
TH		 4745 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4746 GFP_KERNEL);
d5e03cbb
TT		 4747 if (!err) {
4748 unsigned long freei = ext4_count_free_inodes(sb);
4749 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4274f516 4750 ext4_superblock_csum_set(sb);
908c7f19
TH		 4751 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4752 GFP_KERNEL);
d5e03cbb
TT		 4753 }
4754 if (!err)
4755 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4756 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4757 if (!err)
908c7f19
TH		 4758 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4759 GFP_KERNEL);
c8585c6f 4760 if (!err)
bbd55937 4761 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
c8585c6f 4762
d5e03cbb
TT		 4763 if (err) {
4764 ext4_msg(sb, KERN_ERR, "insufficient memory");
4765 goto failed_mount6;
4766 }
4767
e2b911c5 4768 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4769 if (!ext4_fill_flex_info(sb)) {
4770 ext4_msg(sb, KERN_ERR,
4771 "unable to initialize "
4772 "flex_bg meta info!");
4773 goto failed_mount6;
4774 }
4775
bfff6873
LC		 4776 err = ext4_register_li_request(sb, first_not_zeroed);
4777 if (err)
dcf2d804 4778 goto failed_mount6;
bfff6873 4779
b5799018 4780 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4781 if (err)
4782 goto failed_mount7;
3197ebdb 4783
9b2ff357
JK		 4784#ifdef CONFIG_QUOTA
4785 /* Enable quota usage during mount. */
bc98a42c 4786 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4787 err = ext4_enable_quotas(sb);
4788 if (err)
4789 goto failed_mount8;
4790 }
4791#endif /* CONFIG_QUOTA */
4792
bc71726c 4793 /*
4794 * Save the original bdev mapping's wb_err value which could be
4795 * used to detect the metadata async write error.
4796 */
4797 spin_lock_init(&sbi->s_bdev_wb_lock);
4798 if (!sb_rdonly(sb))
4799 errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
4800 &sbi->s_bdev_wb_err);
4801 sb->s_bdev->bd_super = sb;
617ba13b
MC		 4802 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4803 ext4_orphan_cleanup(sb, es);
4804 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4805 if (needs_recovery) {
b31e1552 4806 ext4_msg(sb, KERN_INFO, "recovery complete");
11215630
JK		 4807 err = ext4_mark_recovery_complete(sb, es);
4808 if (err)
4809 goto failed_mount8;
0390131b
FM		 4810 }
4811 if (EXT4_SB(sb)->s_journal) {
4812 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4813 descr = " journalled data mode";
4814 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4815 descr = " ordered data mode";
4816 else
4817 descr = " writeback data mode";
4818 } else
4819 descr = "out journal";
4820
79add3a3
LC		 4821 if (test_opt(sb, DISCARD)) {
4822 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4823 if (!blk_queue_discard(q))
4824 ext4_msg(sb, KERN_WARNING,
4825 "mounting with \"discard\" option, but "
4826 "the device does not support discard");
4827 }
4828
e294a537
TT		 4829 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4830 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4831 "Opts: %.*s%s%s", descr,
4832 (int) sizeof(sbi->s_es->s_mount_opts),
4833 sbi->s_es->s_mount_opts,
e294a537 4834 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4835
66e61a9e
TT		 4836 if (es->s_error_count)
4837 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4838
efbed4dc
TT		 4839 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4840 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4841 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4842 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4843
d4c402d9 4844 kfree(orig_data);
ac27a0ec
DK		 4845 return 0;
4846
617ba13b 4847cantfind_ext4:
ac27a0ec 4848 if (!silent)
b31e1552 4849 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4850 goto failed_mount;
4851
72ba7450 4852failed_mount8:
ebd173be 4853 ext4_unregister_sysfs(sb);
dcf2d804
TM		 4854failed_mount7:
4855 ext4_unregister_li_request(sb);
4856failed_mount6:
f9ae9cf5 4857 ext4_mb_release(sb);
7c990728
SJS		 4858 rcu_read_lock();
4859 flex_groups = rcu_dereference(sbi->s_flex_groups);
4860 if (flex_groups) {
4861 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
4862 kvfree(flex_groups[i]);
4863 kvfree(flex_groups);
4864 }
4865 rcu_read_unlock();
d5e03cbb
TT		 4866 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4867 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4868 percpu_counter_destroy(&sbi->s_dirs_counter);
4869 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
bbd55937 4870 percpu_free_rwsem(&sbi->s_writepages_rwsem);
00764937 4871failed_mount5:
f9ae9cf5
TT		 4872 ext4_ext_release(sb);
4873 ext4_release_system_zone(sb);
4874failed_mount4a:
94bf608a 4875 dput(sb->s_root);
32a9bb57 4876 sb->s_root = NULL;
94bf608a 4877failed_mount4:
b31e1552 4878 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4879 if (EXT4_SB(sb)->rsv_conversion_wq)
4880 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4881failed_mount_wq:
50c15df6
CX		 4882 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4883 sbi->s_ea_inode_cache = NULL;
4884
4885 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4886 sbi->s_ea_block_cache = NULL;
4887
0390131b
FM		 4888 if (sbi->s_journal) {
4889 jbd2_journal_destroy(sbi->s_journal);
4890 sbi->s_journal = NULL;
4891 }
50460fe8 4892failed_mount3a:
d3922a77 4893 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4894failed_mount3:
9105bb14 4895 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4896 if (sbi->s_mmp_tsk)
4897 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 4898failed_mount2:
1d0c3924
TT		 4899 rcu_read_lock();
4900 group_desc = rcu_dereference(sbi->s_group_desc);
ac27a0ec 4901 for (i = 0; i < db_count; i++)
1d0c3924
TT		 4902 brelse(group_desc[i]);
4903 kvfree(group_desc);
4904 rcu_read_unlock();
ac27a0ec 4905failed_mount:
0441984a
DW		 4906 if (sbi->s_chksum_driver)
4907 crypto_free_shash(sbi->s_chksum_driver);
c83ad55e
GKB		 4908
4909#ifdef CONFIG_UNICODE
4910 utf8_unload(sbi->s_encoding);
4911#endif
4912
ac27a0ec 4913#ifdef CONFIG_QUOTA
a2d4a646 4914 for (i = 0; i < EXT4_MAXQUOTAS; i++)
0ba33fac 4915 kfree(get_qf_name(sb, sbi, i));
ac27a0ec 4916#endif
ed318a6c 4917 fscrypt_free_dummy_context(&sbi->s_dummy_enc_ctx);
617ba13b 4918 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4919 brelse(bh);
4920out_fail:
4921 sb->s_fs_info = NULL;
f6830165 4922 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4923out_free_base:
ac27a0ec 4924 kfree(sbi);
d4c402d9 4925 kfree(orig_data);
5e405595 4926 fs_put_dax(dax_dev);
07aa2ea1 4927 return err ? err : ret;
ac27a0ec
DK		 4928}
4929
4930/*
4931 * Setup any per-fs journal parameters now. We'll do this both on
4932 * initial mount, once the journal has been initialised but before we've
4933 * done any recovery; and again on any subsequent remount.
4934 */
617ba13b 4935static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4936{
617ba13b 4937 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4938
30773840
TT		 4939 journal->j_commit_interval = sbi->s_commit_interval;
4940 journal->j_min_batch_time = sbi->s_min_batch_time;
4941 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4942
a931da6a 4943 write_lock(&journal->j_state_lock);
ac27a0ec 4944 if (test_opt(sb, BARRIER))
dab291af 4945 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4946 else
dab291af 4947 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4948 if (test_opt(sb, DATA_ERR_ABORT))
4949 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4950 else
4951 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4952 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4953}
4954
c6cb7e77
EW		 4955static struct inode *ext4_get_journal_inode(struct super_block *sb,
4956 unsigned int journal_inum)
ac27a0ec
DK		 4957{
4958 struct inode *journal_inode;
ac27a0ec 4959
c6cb7e77
EW		 4960 /*
4961 * Test for the existence of a valid inode on disk. Bad things
4962 * happen if we iget() an unused inode, as the subsequent iput()
4963 * will try to delete it.
4964 */
8a363970 4965 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 4966 if (IS_ERR(journal_inode)) {
b31e1552 4967 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4968 return NULL;
4969 }
4970 if (!journal_inode->i_nlink) {
4971 make_bad_inode(journal_inode);
4972 iput(journal_inode);
b31e1552 4973 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4974 return NULL;
4975 }
4976
e5f8eab8 4977 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4978 journal_inode, journal_inode->i_size);
1d1fe1ee 4979 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4980 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4981 iput(journal_inode);
4982 return NULL;
4983 }
c6cb7e77
EW		 4984 return journal_inode;
4985}
4986
4987static journal_t *ext4_get_journal(struct super_block *sb,
4988 unsigned int journal_inum)
4989{
4990 struct inode *journal_inode;
4991 journal_t *journal;
4992
11215630
JK		 4993 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
4994 return NULL;
c6cb7e77
EW		 4995
4996 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4997 if (!journal_inode)
4998 return NULL;
ac27a0ec 4999
dab291af 5000 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 5001 if (!journal) {
b31e1552 5002 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 5003 iput(journal_inode);
5004 return NULL;
5005 }
5006 journal->j_private = sb;
617ba13b 5007 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 5008 return journal;
5009}
5010
617ba13b 5011static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 5012 dev_t j_dev)
5013{
2b2d6d01 5014 struct buffer_head *bh;
ac27a0ec 5015 journal_t *journal;
617ba13b
MC		 5016 ext4_fsblk_t start;
5017 ext4_fsblk_t len;
ac27a0ec 5018 int hblock, blocksize;
617ba13b 5019 ext4_fsblk_t sb_block;
ac27a0ec 5020 unsigned long offset;
2b2d6d01 5021 struct ext4_super_block *es;
ac27a0ec
DK		 5022 struct block_device *bdev;
5023
11215630
JK		 5024 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5025 return NULL;
0390131b 5026
b31e1552 5027 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 5028 if (bdev == NULL)
5029 return NULL;
5030
ac27a0ec 5031 blocksize = sb->s_blocksize;
e1defc4f 5032 hblock = bdev_logical_block_size(bdev);
ac27a0ec 5033 if (blocksize < hblock) {
b31e1552
ES		 5034 ext4_msg(sb, KERN_ERR,
5035 "blocksize too small for journal device");
ac27a0ec
DK		 5036 goto out_bdev;
5037 }
5038
617ba13b
MC		 5039 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5040 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 5041 set_blocksize(bdev, blocksize);
5042 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 5043 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5044 "external journal");
ac27a0ec
DK		 5045 goto out_bdev;
5046 }
5047
2716b802 5048 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 5049 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 5050 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 5051 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 5052 ext4_msg(sb, KERN_ERR, "external journal has "
5053 "bad superblock");
ac27a0ec
DK		 5054 brelse(bh);
5055 goto out_bdev;
5056 }
5057
df4763be
DW		 5058 if ((le32_to_cpu(es->s_feature_ro_compat) &
5059 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5060 es->s_checksum != ext4_superblock_csum(sb, es)) {
5061 ext4_msg(sb, KERN_ERR, "external journal has "
5062 "corrupt superblock");
5063 brelse(bh);
5064 goto out_bdev;
5065 }
5066
617ba13b 5067 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 5068 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 5069 brelse(bh);
5070 goto out_bdev;
5071 }
5072
bd81d8ee 5073 len = ext4_blocks_count(es);
ac27a0ec
DK		 5074 start = sb_block + 1;
5075 brelse(bh); /* we're done with the superblock */
5076
dab291af 5077 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 5078 start, len, blocksize);
5079 if (!journal) {
b31e1552 5080 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 5081 goto out_bdev;
5082 }
5083 journal->j_private = sb;
dfec8a14 5084 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 5085 wait_on_buffer(journal->j_sb_buffer);
5086 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 5087 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 5088 goto out_journal;
5089 }
5090 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 5091 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5092 "user (unsupported) - %d",
ac27a0ec
DK		 5093 be32_to_cpu(journal->j_superblock->s_nr_users));
5094 goto out_journal;
5095 }
617ba13b
MC		 5096 EXT4_SB(sb)->journal_bdev = bdev;
5097 ext4_init_journal_params(sb, journal);
ac27a0ec 5098 return journal;
0b8e58a1 5099
ac27a0ec 5100out_journal:
dab291af 5101 jbd2_journal_destroy(journal);
ac27a0ec 5102out_bdev:
617ba13b 5103 ext4_blkdev_put(bdev);
ac27a0ec
DK		 5104 return NULL;
5105}
5106
617ba13b
MC		 5107static int ext4_load_journal(struct super_block *sb,
5108 struct ext4_super_block *es,
ac27a0ec
DK		 5109 unsigned long journal_devnum)
5110{
5111 journal_t *journal;
5112 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5113 dev_t journal_dev;
5114 int err = 0;
5115 int really_read_only;
273108fa 5116 int journal_dev_ro;
ac27a0ec 5117
11215630
JK		 5118 if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5119 return -EFSCORRUPTED;
0390131b 5120
ac27a0ec
DK		 5121 if (journal_devnum &&
5122 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 5123 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5124 "numbers have changed");
ac27a0ec
DK		 5125 journal_dev = new_decode_dev(journal_devnum);
5126 } else
5127 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5128
273108fa
LC		 5129 if (journal_inum && journal_dev) {
5130 ext4_msg(sb, KERN_ERR,
5131 "filesystem has both journal inode and journal device!");
5132 return -EINVAL;
5133 }
5134
5135 if (journal_inum) {
5136 journal = ext4_get_journal(sb, journal_inum);
5137 if (!journal)
5138 return -EINVAL;
5139 } else {
5140 journal = ext4_get_dev_journal(sb, journal_dev);
5141 if (!journal)
5142 return -EINVAL;
5143 }
5144
5145 journal_dev_ro = bdev_read_only(journal->j_dev);
5146 really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5147
5148 if (journal_dev_ro && !sb_rdonly(sb)) {
5149 ext4_msg(sb, KERN_ERR,
5150 "journal device read-only, try mounting with '-o ro'");
5151 err = -EROFS;
5152 goto err_out;
5153 }
ac27a0ec
DK		 5154
5155 /*
5156 * Are we loading a blank journal or performing recovery after a
5157 * crash? For recovery, we need to check in advance whether we
5158 * can get read-write access to the device.
5159 */
e2b911c5 5160 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 5161 if (sb_rdonly(sb)) {
b31e1552
ES		 5162 ext4_msg(sb, KERN_INFO, "INFO: recovery "
5163 "required on readonly filesystem");
ac27a0ec 5164 if (really_read_only) {
b31e1552 5165 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 5166 "unavailable, cannot proceed "
5167 "(try mounting with noload)");
273108fa
LC		 5168 err = -EROFS;
5169 goto err_out;
ac27a0ec 5170 }
b31e1552
ES		 5171 ext4_msg(sb, KERN_INFO, "write access will "
5172 "be enabled during recovery");
ac27a0ec
DK		 5173 }
5174 }
5175
90576c0b 5176 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 5177 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 5178
e2b911c5 5179 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 5180 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 5181 if (!err) {
5182 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
5183 if (save)
5184 memcpy(save, ((char *) es) +
5185 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 5186 err = jbd2_journal_load(journal);
1c13d5c0
TT		 5187 if (save)
5188 memcpy(((char *) es) + EXT4_S_ERR_START,
5189 save, EXT4_S_ERR_LEN);
5190 kfree(save);
5191 }
ac27a0ec
DK		 5192
5193 if (err) {
b31e1552 5194 ext4_msg(sb, KERN_ERR, "error loading journal");
273108fa 5195 goto err_out;
ac27a0ec
DK		 5196 }
5197
617ba13b 5198 EXT4_SB(sb)->s_journal = journal;
11215630
JK		 5199 err = ext4_clear_journal_err(sb, es);
5200 if (err) {
5201 EXT4_SB(sb)->s_journal = NULL;
5202 jbd2_journal_destroy(journal);
5203 return err;
5204 }
ac27a0ec 5205
c41303ce 5206 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 5207 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5208 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 5209
5210 /* Make sure we flush the recovery flag to disk. */
e2d67052 5211 ext4_commit_super(sb, 1);
ac27a0ec
DK		 5212 }
5213
5214 return 0;
273108fa
LC		 5215
5216err_out:
5217 jbd2_journal_destroy(journal);
5218 return err;
ac27a0ec
DK		 5219}
5220
e2d67052 5221static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 5222{
e2d67052 5223 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 5224 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 5225 int error = 0;
ac27a0ec 5226
bdfe0cbd 5227 if (!sbh || block_device_ejected(sb))
c4be0c1d 5228 return error;
a17712c8
JD		 5229
5230 /*
5231 * The superblock bh should be mapped, but it might not be if the
5232 * device was hot-removed. Not much we can do but fail the I/O.
5233 */
5234 if (!buffer_mapped(sbh))
5235 return error;
5236
71290b36
TT		 5237 /*
5238 * If the file system is mounted read-only, don't update the
5239 * superblock write time. This avoids updating the superblock
5240 * write time when we are mounting the root file system
5241 * read/only but we need to replay the journal; at that point,
5242 * for people who are east of GMT and who make their clock
5243 * tick in localtime for Windows bug-for-bug compatibility,
5244 * the clock is set in the future, and this will cause e2fsck
5245 * to complain and force a full file system check.
5246 */
1751e8a6 5247 if (!(sb->s_flags & SB_RDONLY))
6a0678a7 5248 ext4_update_tstamp(es, s_wtime);
f613dfcb
TT		 5249 if (sb->s_bdev->bd_part)
5250 es->s_kbytes_written =
5251 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
dbae2c55
MC		 5252 ((part_stat_read(sb->s_bdev->bd_part,
5253 sectors[STAT_WRITE]) -
afc32f7e 5254 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 5255 else
5256 es->s_kbytes_written =
5257 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 5258 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5259 ext4_free_blocks_count_set(es,
57042651
TT		 5260 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5261 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 5262 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5263 es->s_free_inodes_count =
5264 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 5265 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 5266 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 5267 ext4_superblock_csum_set(sb);
1566a48a
TT		 5268 if (sync)
5269 lock_buffer(sbh);
e8680786 5270 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 5271 /*
5272 * Oh, dear. A previous attempt to write the
5273 * superblock failed. This could happen because the
5274 * USB device was yanked out. Or it could happen to
5275 * be a transient write error and maybe the block will
5276 * be remapped. Nothing we can do but to retry the
5277 * write and hope for the best.
5278 */
5279 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5280 "superblock detected");
5281 clear_buffer_write_io_error(sbh);
5282 set_buffer_uptodate(sbh);
5283 }
ac27a0ec 5284 mark_buffer_dirty(sbh);
914258bf 5285 if (sync) {
1566a48a 5286 unlock_buffer(sbh);
564bc402 5287 error = __sync_dirty_buffer(sbh,
00473374 5288 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c89128a0 5289 if (buffer_write_io_error(sbh)) {
b31e1552
ES		 5290 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5291 "superblock");
914258bf
TT		 5292 clear_buffer_write_io_error(sbh);
5293 set_buffer_uptodate(sbh);
5294 }
5295 }
c4be0c1d 5296 return error;
ac27a0ec
DK		 5297}
5298
ac27a0ec
DK		 5299/*
5300 * Have we just finished recovery? If so, and if we are mounting (or
5301 * remounting) the filesystem readonly, then we will end up with a
5302 * consistent fs on disk. Record that fact.
5303 */
11215630
JK		 5304static int ext4_mark_recovery_complete(struct super_block *sb,
5305 struct ext4_super_block *es)
ac27a0ec 5306{
11215630 5307 int err;
617ba13b 5308 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 5309
e2b911c5 5310 if (!ext4_has_feature_journal(sb)) {
11215630
JK		 5311 if (journal != NULL) {
5312 ext4_error(sb, "Journal got removed while the fs was "
5313 "mounted!");
5314 return -EFSCORRUPTED;
5315 }
5316 return 0;
0390131b 5317 }
dab291af 5318 jbd2_journal_lock_updates(journal);
11215630
JK		 5319 err = jbd2_journal_flush(journal);
5320 if (err < 0)
7ffe1ea8
HK		 5321 goto out;
5322
bc98a42c 5323 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 5324 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 5325 ext4_commit_super(sb, 1);
ac27a0ec 5326 }
7ffe1ea8 5327out:
dab291af 5328 jbd2_journal_unlock_updates(journal);
11215630 5329 return err;
ac27a0ec
DK		 5330}
5331
5332/*
5333 * If we are mounting (or read-write remounting) a filesystem whose journal
5334 * has recorded an error from a previous lifetime, move that error to the
5335 * main filesystem now.
5336 */
11215630 5337static int ext4_clear_journal_err(struct super_block *sb,
2b2d6d01 5338 struct ext4_super_block *es)
ac27a0ec
DK		 5339{
5340 journal_t *journal;
5341 int j_errno;
5342 const char *errstr;
5343
11215630
JK		 5344 if (!ext4_has_feature_journal(sb)) {
5345 ext4_error(sb, "Journal got removed while the fs was mounted!");
5346 return -EFSCORRUPTED;
5347 }
0390131b 5348
617ba13b 5349 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 5350
5351 /*
5352 * Now check for any error status which may have been recorded in the
617ba13b 5353 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 5354 */
5355
dab291af 5356 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 5357 if (j_errno) {
5358 char nbuf[16];
5359
617ba13b 5360 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 5361 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 5362 "from previous mount: %s", errstr);
12062ddd 5363 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 5364
617ba13b
MC		 5365 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5366 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 5367 ext4_commit_super(sb, 1);
ac27a0ec 5368
dab291af 5369 jbd2_journal_clear_err(journal);
d796c52e 5370 jbd2_journal_update_sb_errno(journal);
ac27a0ec 5371 }
11215630 5372 return 0;
ac27a0ec
DK		 5373}
5374
5375/*
5376 * Force the running and committing transactions to commit,
5377 * and wait on the commit.
5378 */
617ba13b 5379int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 5380{
5381 journal_t *journal;
ac27a0ec 5382
bc98a42c 5383 if (sb_rdonly(sb))
ac27a0ec
DK		 5384 return 0;
5385
617ba13b 5386 journal = EXT4_SB(sb)->s_journal;
b1deefc9 5387 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 5388}
5389
617ba13b 5390static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 5391{
14ce0cb4 5392 int ret = 0;
9eddacf9 5393 tid_t target;
06a407f1 5394 bool needs_barrier = false;
8d5d02e6 5395 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5396
49598e04 5397 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 5398 return 0;
5399
9bffad1e 5400 trace_ext4_sync_fs(sb, wait);
2e8fa54e 5401 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 5402 /*
5403 * Writeback quota in non-journalled quota case - journalled quota has
5404 * no dirty dquots
5405 */
5406 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 5407 /*
5408 * Data writeback is possible w/o journal transaction, so barrier must
5409 * being sent at the end of the function. But we can skip it if
5410 * transaction_commit will do it for us.
5411 */
bda32530
TT		 5412 if (sbi->s_journal) {
5413 target = jbd2_get_latest_transaction(sbi->s_journal);
5414 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5415 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5416 needs_barrier = true;
5417
5418 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5419 if (wait)
5420 ret = jbd2_log_wait_commit(sbi->s_journal,
5421 target);
5422 }
5423 } else if (wait && test_opt(sb, BARRIER))
06a407f1 5424 needs_barrier = true;
06a407f1
DM		 5425 if (needs_barrier) {
5426 int err;
9398554f 5427 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL);
06a407f1
DM		 5428 if (!ret)
5429 ret = err;
0390131b 5430 }
06a407f1
DM		 5431
5432 return ret;
5433}
5434
ac27a0ec
DK		 5435/*
5436 * LVM calls this function before a (read-only) snapshot is created. This
5437 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 5438 *
5439 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 5440 * state independently. It relies on upper layer to stop all data & metadata
5441 * modifications.
ac27a0ec 5442 */
c4be0c1d 5443static int ext4_freeze(struct super_block *sb)
ac27a0ec 5444{
c4be0c1d
TS		 5445 int error = 0;
5446 journal_t *journal;
ac27a0ec 5447
bc98a42c 5448 if (sb_rdonly(sb))
9ca92389 5449 return 0;
ac27a0ec 5450
9ca92389 5451 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 5452
bb044576
TT		 5453 if (journal) {
5454 /* Now we set up the journal barrier. */
5455 jbd2_journal_lock_updates(journal);
ac27a0ec 5456
bb044576
TT		 5457 /*
5458 * Don't clear the needs_recovery flag if we failed to
5459 * flush the journal.
5460 */
5461 error = jbd2_journal_flush(journal);
5462 if (error < 0)
5463 goto out;
c642dc9e
ES		 5464
5465 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 5466 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 5467 }
9ca92389 5468
9ca92389 5469 error = ext4_commit_super(sb, 1);
6b0310fb 5470out:
bb044576
TT		 5471 if (journal)
5472 /* we rely on upper layer to stop further updates */
5473 jbd2_journal_unlock_updates(journal);
6b0310fb 5474 return error;
ac27a0ec
DK		 5475}
5476
5477/*
5478 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5479 * flag here, even though the filesystem is not technically dirty yet.
5480 */
c4be0c1d 5481static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 5482{
bc98a42c 5483 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 5484 return 0;
5485
c642dc9e
ES		 5486 if (EXT4_SB(sb)->s_journal) {
5487 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 5488 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 5489 }
5490
9ca92389 5491 ext4_commit_super(sb, 1);
c4be0c1d 5492 return 0;
ac27a0ec
DK		 5493}
5494
673c6100
TT		 5495/*
5496 * Structure to save mount options for ext4_remount's benefit
5497 */
5498struct ext4_mount_options {
5499 unsigned long s_mount_opt;
a2595b8a 5500 unsigned long s_mount_opt2;
08cefc7a
EB		 5501 kuid_t s_resuid;
5502 kgid_t s_resgid;
673c6100
TT		 5503 unsigned long s_commit_interval;
5504 u32 s_min_batch_time, s_max_batch_time;
5505#ifdef CONFIG_QUOTA
5506 int s_jquota_fmt;
a2d4a646 5507 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 5508#endif
5509};
5510
2b2d6d01 5511static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5512{
2b2d6d01 5513 struct ext4_super_block *es;
617ba13b 5514 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5515 unsigned long old_sb_flags;
617ba13b 5516 struct ext4_mount_options old_opts;
c79d967d 5517 int enable_quota = 0;
8a266467 5518 ext4_group_t g;
b3881f74 5519 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5520 int err = 0;
ac27a0ec 5521#ifdef CONFIG_QUOTA
03dafb5f 5522 int i, j;
33458eab 5523 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec 5524#endif
d4c402d9 5525 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec 5526
21ac738e
CX		 5527 if (data && !orig_data)
5528 return -ENOMEM;
5529
ac27a0ec
DK		 5530 /* Store the original options */
5531 old_sb_flags = sb->s_flags;
5532 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5533 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5534 old_opts.s_resuid = sbi->s_resuid;
5535 old_opts.s_resgid = sbi->s_resgid;
5536 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5537 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5538 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5539#ifdef CONFIG_QUOTA
5540 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5541 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5542 if (sbi->s_qf_names[i]) {
33458eab
TT		 5543 char *qf_name = get_qf_name(sb, sbi, i);
5544
5545 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 5546 if (!old_opts.s_qf_names[i]) {
5547 for (j = 0; j < i; j++)
5548 kfree(old_opts.s_qf_names[j]);
3e36a163 5549 kfree(orig_data);
03dafb5f
CG		 5550 return -ENOMEM;
5551 }
5552 } else
5553 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5554#endif
b3881f74
TT		 5555 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5556 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5557
661aa520 5558 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5559 err = -EINVAL;
5560 goto restore_opts;
5561 }
5562
6b992ff2 5563 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5564 test_opt(sb, JOURNAL_CHECKSUM)) {
5565 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5566 "during remount not supported; ignoring");
5567 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5568 }
5569
6ae6514b
PS		 5570 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5571 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5572 ext4_msg(sb, KERN_ERR, "can't mount with "
5573 "both data=journal and delalloc");
5574 err = -EINVAL;
5575 goto restore_opts;
5576 }
5577 if (test_opt(sb, DIOREAD_NOLOCK)) {
5578 ext4_msg(sb, KERN_ERR, "can't mount with "
5579 "both data=journal and dioread_nolock");
5580 err = -EINVAL;
5581 goto restore_opts;
5582 }
ab04df78
JK		 5583 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5584 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5585 ext4_msg(sb, KERN_ERR, "can't mount with "
5586 "journal_async_commit in data=ordered mode");
5587 err = -EINVAL;
5588 goto restore_opts;
5589 }
923ae0ff
RZ		 5590 }
5591
cdb7ee4c
TE		 5592 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5593 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5594 err = -EINVAL;
5595 goto restore_opts;
5596 }
5597
4ab2f15b 5598 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
54d3adbc 5599 ext4_abort(sb, EXT4_ERR_ESHUTDOWN, "Abort forced by user");
ac27a0ec 5600
1751e8a6
LT		 5601 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5602 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5603
5604 es = sbi->s_es;
5605
b3881f74 5606 if (sbi->s_journal) {
0390131b 5607 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5608 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5609 }
ac27a0ec 5610
1751e8a6
LT		 5611 if (*flags & SB_LAZYTIME)
5612 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5613
1751e8a6 5614 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5615 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5616 err = -EROFS;
5617 goto restore_opts;
5618 }
5619
1751e8a6 5620 if (*flags & SB_RDONLY) {
38c03b34
TT		 5621 err = sync_filesystem(sb);
5622 if (err < 0)
5623 goto restore_opts;
0f0dd62f
CH		 5624 err = dquot_suspend(sb, -1);
5625 if (err < 0)
c79d967d 5626 goto restore_opts;
c79d967d 5627
ac27a0ec
DK		 5628 /*
5629 * First of all, the unconditional stuff we have to do
5630 * to disable replay of the journal when we next remount
5631 */
1751e8a6 5632 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5633
5634 /*
5635 * OK, test if we are remounting a valid rw partition
5636 * readonly, and if so set the rdonly flag and then
5637 * mark the partition as valid again.
5638 */
617ba13b
MC		 5639 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5640 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5641 es->s_state = cpu_to_le16(sbi->s_mount_state);
5642
11215630
JK		 5643 if (sbi->s_journal) {
5644 /*
5645 * We let remount-ro finish even if marking fs
5646 * as clean failed...
5647 */
0390131b 5648 ext4_mark_recovery_complete(sb, es);
11215630 5649 }
2dca60d9
TT		 5650 if (sbi->s_mmp_tsk)
5651 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5652 } else {
a13fb1a4 5653 /* Make sure we can mount this feature set readwrite */
e2b911c5 5654 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5655 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5656 err = -EROFS;
5657 goto restore_opts;
5658 }
8a266467
TT		 5659 /*
5660 * Make sure the group descriptor checksums
0b8e58a1 5661 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5662 */
5663 for (g = 0; g < sbi->s_groups_count; g++) {
5664 struct ext4_group_desc *gdp =
5665 ext4_get_group_desc(sb, g, NULL);
5666
feb0ab32 5667 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5668 ext4_msg(sb, KERN_ERR,
5669 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5670 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5671 le16_to_cpu(gdp->bg_checksum));
6a797d27 5672 err = -EFSBADCRC;
8a266467
TT		 5673 goto restore_opts;
5674 }
5675 }
5676
ead6596b
ES		 5677 /*
5678 * If we have an unprocessed orphan list hanging
5679 * around from a previously readonly bdev mount,
5680 * require a full umount/remount for now.
5681 */
5682 if (es->s_last_orphan) {
b31e1552 5683 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5684 "remount RDWR because of unprocessed "
5685 "orphan inode list. Please "
b31e1552 5686 "umount/remount instead");
ead6596b
ES		 5687 err = -EINVAL;
5688 goto restore_opts;
5689 }
5690
bc71726c 5691 /*
5692 * Update the original bdev mapping's wb_err value
5693 * which could be used to detect the metadata async
5694 * write error.
5695 */
5696 errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
5697 &sbi->s_bdev_wb_err);
5698
ac27a0ec
DK		 5699 /*
5700 * Mounting a RDONLY partition read-write, so reread
5701 * and store the current valid flag. (It may have
5702 * been changed by e2fsck since we originally mounted
5703 * the partition.)
5704 */
11215630
JK		 5705 if (sbi->s_journal) {
5706 err = ext4_clear_journal_err(sb, es);
5707 if (err)
5708 goto restore_opts;
5709 }
ac27a0ec 5710 sbi->s_mount_state = le16_to_cpu(es->s_state);
c89128a0
JK		 5711
5712 err = ext4_setup_super(sb, es, 0);
5713 if (err)
5714 goto restore_opts;
5715
5716 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5717 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5718 if (ext4_multi_mount_protect(sb,
5719 le64_to_cpu(es->s_mmp_block))) {
5720 err = -EROFS;
5721 goto restore_opts;
5722 }
c79d967d 5723 enable_quota = 1;
ac27a0ec
DK		 5724 }
5725 }
bfff6873
LC		 5726
5727 /*
5728 * Reinitialize lazy itable initialization thread based on
5729 * current settings
5730 */
bc98a42c 5731 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5732 ext4_unregister_li_request(sb);
5733 else {
5734 ext4_group_t first_not_zeroed;
5735 first_not_zeroed = ext4_has_uninit_itable(sb);
5736 ext4_register_li_request(sb, first_not_zeroed);
5737 }
5738
6fd058f7 5739 ext4_setup_system_zone(sb);
c89128a0
JK		 5740 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5741 err = ext4_commit_super(sb, 1);
5742 if (err)
5743 goto restore_opts;
5744 }
0390131b 5745
ac27a0ec
DK		 5746#ifdef CONFIG_QUOTA
5747 /* Release old quota file names */
a2d4a646 5748 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5749 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5750 if (enable_quota) {
5751 if (sb_any_quota_suspended(sb))
5752 dquot_resume(sb, -1);
e2b911c5 5753 else if (ext4_has_feature_quota(sb)) {
7c319d32 5754 err = ext4_enable_quotas(sb);
07724f98 5755 if (err)
7c319d32 5756 goto restore_opts;
7c319d32
AK		 5757 }
5758 }
ac27a0ec 5759#endif
d4c402d9 5760
1751e8a6 5761 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5762 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5763 kfree(orig_data);
ac27a0ec 5764 return 0;
0b8e58a1 5765
ac27a0ec
DK		 5766restore_opts:
5767 sb->s_flags = old_sb_flags;
5768 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5769 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5770 sbi->s_resuid = old_opts.s_resuid;
5771 sbi->s_resgid = old_opts.s_resgid;
5772 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5773 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5774 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5775#ifdef CONFIG_QUOTA
5776 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5777 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
33458eab
TT		 5778 to_free[i] = get_qf_name(sb, sbi, i);
5779 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 5780 }
33458eab
TT		 5781 synchronize_rcu();
5782 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5783 kfree(to_free[i]);
ac27a0ec 5784#endif
d4c402d9 5785 kfree(orig_data);
ac27a0ec
DK		 5786 return err;
5787}
5788
689c958c
LX		 5789#ifdef CONFIG_QUOTA
5790static int ext4_statfs_project(struct super_block *sb,
5791 kprojid_t projid, struct kstatfs *buf)
5792{
5793 struct kqid qid;
5794 struct dquot *dquot;
5795 u64 limit;
5796 u64 curblock;
5797
5798 qid = make_kqid_projid(projid);
5799 dquot = dqget(sb, qid);
5800 if (IS_ERR(dquot))
5801 return PTR_ERR(dquot);
7b9ca4c6 5802 spin_lock(&dquot->dq_dqb_lock);
689c958c 5803
a08fe66e
CX		 5804 limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
5805 dquot->dq_dqb.dqb_bhardlimit);
57c32ea4
CX		 5806 limit >>= sb->s_blocksize_bits;
5807
689c958c 5808 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 5809 curblock = (dquot->dq_dqb.dqb_curspace +
5810 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 5811 buf->f_blocks = limit;
5812 buf->f_bfree = buf->f_bavail =
5813 (buf->f_blocks > curblock) ?
5814 (buf->f_blocks - curblock) : 0;
5815 }
5816
a08fe66e
CX		 5817 limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
5818 dquot->dq_dqb.dqb_ihardlimit);
689c958c
LX		 5819 if (limit && buf->f_files > limit) {
5820 buf->f_files = limit;
5821 buf->f_ffree =
5822 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5823 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5824 }
5825
7b9ca4c6 5826 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5827 dqput(dquot);
5828 return 0;
5829}
5830#endif
5831
2b2d6d01 5832static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5833{
5834 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5835 struct ext4_sb_info *sbi = EXT4_SB(sb);
5836 struct ext4_super_block *es = sbi->s_es;
27dd4385 5837 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5838 u64 fsid;
d02a9391 5839 s64 bfree;
27dd4385 5840 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5841
952fc18e
TT		 5842 if (!test_opt(sb, MINIX_DF))
5843 overhead = sbi->s_overhead;
ac27a0ec 5844
617ba13b 5845 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5846 buf->f_bsize = sb->s_blocksize;
b72f78cb 5847 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5848 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5849 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5850 /* prevent underflow in case that few free space is available */
57042651 5851 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5852 buf->f_bavail = buf->f_bfree -
5853 (ext4_r_blocks_count(es) + resv_blocks);
5854 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5855 buf->f_bavail = 0;
5856 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5857 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5858 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5859 fsid = le64_to_cpup((void *)es->s_uuid) ^
5860 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5861 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5862 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5863
689c958c
LX		 5864#ifdef CONFIG_QUOTA
5865 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5866 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5867 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5868#endif
ac27a0ec
DK		 5869 return 0;
5870}
5871
ac27a0ec
DK		 5872
5873#ifdef CONFIG_QUOTA
5874
bc8230ee
JK		 5875/*
5876 * Helper functions so that transaction is started before we acquire dqio_sem
5877 * to keep correct lock ordering of transaction > dqio_sem
5878 */
ac27a0ec
DK		 5879static inline struct inode *dquot_to_inode(struct dquot *dquot)
5880{
4c376dca 5881 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5882}
5883
617ba13b 5884static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5885{
5886 int ret, err;
5887 handle_t *handle;
5888 struct inode *inode;
5889
5890 inode = dquot_to_inode(dquot);
9924a92a 5891 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5892 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5893 if (IS_ERR(handle))
5894 return PTR_ERR(handle);
5895 ret = dquot_commit(dquot);
617ba13b 5896 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5897 if (!ret)
5898 ret = err;
5899 return ret;
5900}
5901
617ba13b 5902static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5903{
5904 int ret, err;
5905 handle_t *handle;
5906
9924a92a 5907 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5908 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5909 if (IS_ERR(handle))
5910 return PTR_ERR(handle);
5911 ret = dquot_acquire(dquot);
617ba13b 5912 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5913 if (!ret)
5914 ret = err;
5915 return ret;
5916}
5917
617ba13b 5918static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5919{
5920 int ret, err;
5921 handle_t *handle;
5922
9924a92a 5923 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5924 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5925 if (IS_ERR(handle)) {
5926 /* Release dquot anyway to avoid endless cycle in dqput() */
5927 dquot_release(dquot);
ac27a0ec 5928 return PTR_ERR(handle);
9c3013e9 5929 }
ac27a0ec 5930 ret = dquot_release(dquot);
617ba13b 5931 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5932 if (!ret)
5933 ret = err;
5934 return ret;
5935}
5936
617ba13b 5937static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5938{
262b4662
JK		 5939 struct super_block *sb = dquot->dq_sb;
5940 struct ext4_sb_info *sbi = EXT4_SB(sb);
5941
2c8be6b2 5942 /* Are we journaling quotas? */
e2b911c5 5943 if (ext4_has_feature_quota(sb) ||
262b4662 5944 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5945 dquot_mark_dquot_dirty(dquot);
617ba13b 5946 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5947 } else {
5948 return dquot_mark_dquot_dirty(dquot);
5949 }
5950}
5951
617ba13b 5952static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5953{
5954 int ret, err;
5955 handle_t *handle;
5956
5957 /* Data block + inode block */
2b0143b5 5958 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5959 if (IS_ERR(handle))
5960 return PTR_ERR(handle);
5961 ret = dquot_commit_info(sb, type);
617ba13b 5962 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5963 if (!ret)
5964 ret = err;
5965 return ret;
5966}
5967
5968/*
5969 * Turn on quotas during mount time - we need to find
5970 * the quota file and such...
5971 */
617ba13b 5972static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5973{
33458eab 5974 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
287a8095 5975 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5976}
5977
daf647d2
TT		 5978static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5979{
5980 struct ext4_inode_info *ei = EXT4_I(inode);
5981
5982 /* The first argument of lockdep_set_subclass has to be
5983 * *exactly* the same as the argument to init_rwsem() --- in
5984 * this case, in init_once() --- or lockdep gets unhappy
5985 * because the name of the lock is set using the
5986 * stringification of the argument to init_rwsem().
5987 */
5988 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5989 lockdep_set_subclass(&ei->i_data_sem, subclass);
5990}
5991
ac27a0ec
DK		 5992/*
5993 * Standard function to be called on quota_on
5994 */
617ba13b 5995static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5996 const struct path *path)
ac27a0ec
DK		 5997{
5998 int err;
ac27a0ec
DK		 5999
6000 if (!test_opt(sb, QUOTA))
6001 return -EINVAL;
0623543b 6002
ac27a0ec 6003 /* Quotafile not on the same filesystem? */
d8c9584e 6004 if (path->dentry->d_sb != sb)
ac27a0ec 6005 return -EXDEV;
0623543b
JK		 6006 /* Journaling quota? */
6007 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 6008 /* Quotafile not in fs root? */
f00c9e44 6009 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 6010 ext4_msg(sb, KERN_WARNING,
6011 "Quota file not on filesystem root. "
6012 "Journaled quota will not work");
91389240
JK		 6013 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6014 } else {
6015 /*
6016 * Clear the flag just in case mount options changed since
6017 * last time.
6018 */
6019 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 6020 }
0623543b
JK		 6021
6022 /*
6023 * When we journal data on quota file, we have to flush journal to see
6024 * all updates to the file when we bypass pagecache...
6025 */
0390131b 6026 if (EXT4_SB(sb)->s_journal &&
2b0143b5 6027 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 6028 /*
6029 * We don't need to lock updates but journal_flush() could
6030 * otherwise be livelocked...
6031 */
6032 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 6033 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 6034 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 6035 if (err)
7ffe1ea8 6036 return err;
0623543b 6037 }
957153fc 6038
daf647d2
TT		 6039 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6040 err = dquot_quota_on(sb, type, format_id, path);
957153fc 6041 if (err) {
daf647d2
TT		 6042 lockdep_set_quota_inode(path->dentry->d_inode,
6043 I_DATA_SEM_NORMAL);
957153fc
JK		 6044 } else {
6045 struct inode *inode = d_inode(path->dentry);
6046 handle_t *handle;
6047
61a92987
JK		 6048 /*
6049 * Set inode flags to prevent userspace from messing with quota
6050 * files. If this fails, we return success anyway since quotas
6051 * are already enabled and this is not a hard failure.
6052 */
957153fc
JK		 6053 inode_lock(inode);
6054 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6055 if (IS_ERR(handle))
6056 goto unlock_inode;
6057 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
6058 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
6059 S_NOATIME | S_IMMUTABLE);
4209ae12 6060 err = ext4_mark_inode_dirty(handle, inode);
957153fc
JK		 6061 ext4_journal_stop(handle);
6062 unlock_inode:
6063 inode_unlock(inode);
6064 }
daf647d2 6065 return err;
ac27a0ec
DK		 6066}
6067
7c319d32
AK		 6068static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
6069 unsigned int flags)
6070{
6071 int err;
6072 struct inode *qf_inode;
a2d4a646 6073 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 6074 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 6075 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6076 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 6077 };
6078
e2b911c5 6079 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 6080
6081 if (!qf_inums[type])
6082 return -EPERM;
6083
8a363970 6084 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32
AK		 6085 if (IS_ERR(qf_inode)) {
6086 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
6087 return PTR_ERR(qf_inode);
6088 }
6089
bcb13850
JK		 6090 /* Don't account quota for quota files to avoid recursion */
6091 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 6092 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7212b95e 6093 err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
daf647d2
TT		 6094 if (err)
6095 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
61157b24 6096 iput(qf_inode);
7c319d32
AK		 6097
6098 return err;
6099}
6100
6101/* Enable usage tracking for all quota types. */
6102static int ext4_enable_quotas(struct super_block *sb)
6103{
6104 int type, err = 0;
a2d4a646 6105 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 6106 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 6107 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6108 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 6109 };
49da9392
JK		 6110 bool quota_mopt[EXT4_MAXQUOTAS] = {
6111 test_opt(sb, USRQUOTA),
6112 test_opt(sb, GRPQUOTA),
6113 test_opt(sb, PRJQUOTA),
6114 };
7c319d32 6115
91389240 6116 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 6117 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 6118 if (qf_inums[type]) {
6119 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 6120 DQUOT_USAGE_ENABLED |
6121 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 6122 if (err) {
6123 ext4_warning(sb,
72ba7450
TT		 6124 "Failed to enable quota tracking "
6125 "(type=%d, err=%d). Please run "
6126 "e2fsck to fix.", type, err);
7f144fd0
JU		 6127 for (type--; type >= 0; type--)
6128 dquot_quota_off(sb, type);
6129
7c319d32
AK		 6130 return err;
6131 }
6132 }
6133 }
6134 return 0;
6135}
6136
ca0e05e4
DM		 6137static int ext4_quota_off(struct super_block *sb, int type)
6138{
21f97697
JK		 6139 struct inode *inode = sb_dqopt(sb)->files[type];
6140 handle_t *handle;
957153fc 6141 int err;
21f97697 6142
87009d86
DM		 6143 /* Force all delayed allocation blocks to be allocated.
6144 * Caller already holds s_umount sem */
6145 if (test_opt(sb, DELALLOC))
ca0e05e4 6146 sync_filesystem(sb);
ca0e05e4 6147
957153fc 6148 if (!inode || !igrab(inode))
0b268590
AG		 6149 goto out;
6150
957153fc 6151 err = dquot_quota_off(sb, type);
964edf66 6152 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 6153 goto out_put;
6154
6155 inode_lock(inode);
61a92987
JK		 6156 /*
6157 * Update modification times of quota files when userspace can
6158 * start looking at them. If we fail, we return success anyway since
6159 * this is not a hard failure and quotas are already disabled.
6160 */
9924a92a 6161 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
4209ae12
HS		 6162 if (IS_ERR(handle)) {
6163 err = PTR_ERR(handle);
957153fc 6164 goto out_unlock;
4209ae12 6165 }
957153fc
JK		 6166 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
6167 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 6168 inode->i_mtime = inode->i_ctime = current_time(inode);
4209ae12 6169 err = ext4_mark_inode_dirty(handle, inode);
21f97697 6170 ext4_journal_stop(handle);
957153fc
JK		 6171out_unlock:
6172 inode_unlock(inode);
6173out_put:
964edf66 6174 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 6175 iput(inode);
6176 return err;
21f97697 6177out:
ca0e05e4
DM		 6178 return dquot_quota_off(sb, type);
6179}
6180
ac27a0ec
DK		 6181/* Read data from quotafile - avoid pagecache and such because we cannot afford
6182 * acquiring the locks... As quota files are never truncated and quota code
25985edc 6183 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 6184 * we don't have to be afraid of races */
617ba13b 6185static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 6186 size_t len, loff_t off)
6187{
6188 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 6189 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 6190 int offset = off & (sb->s_blocksize - 1);
6191 int tocopy;
6192 size_t toread;
6193 struct buffer_head *bh;
6194 loff_t i_size = i_size_read(inode);
6195
6196 if (off > i_size)
6197 return 0;
6198 if (off+len > i_size)
6199 len = i_size-off;
6200 toread = len;
6201 while (toread > 0) {
6202 tocopy = sb->s_blocksize - offset < toread ?
6203 sb->s_blocksize - offset : toread;
1c215028
TT		 6204 bh = ext4_bread(NULL, inode, blk, 0);
6205 if (IS_ERR(bh))
6206 return PTR_ERR(bh);
ac27a0ec
DK		 6207 if (!bh) /* A hole? */
6208 memset(data, 0, tocopy);
6209 else
6210 memcpy(data, bh->b_data+offset, tocopy);
6211 brelse(bh);
6212 offset = 0;
6213 toread -= tocopy;
6214 data += tocopy;
6215 blk++;
6216 }
6217 return len;
6218}
6219
6220/* Write to quotafile (we know the transaction is already started and has
6221 * enough credits) */
617ba13b 6222static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 6223 const char *data, size_t len, loff_t off)
6224{
6225 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 6226 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4209ae12 6227 int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
c5e298ae 6228 int retries = 0;
ac27a0ec
DK		 6229 struct buffer_head *bh;
6230 handle_t *handle = journal_current_handle();
6231
0390131b 6232 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 6233 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6234 " cancelled because transaction is not started",
9c3013e9
JK		 6235 (unsigned long long)off, (unsigned long long)len);
6236 return -EIO;
6237 }
67eeb568
DM		 6238 /*
6239 * Since we account only one data block in transaction credits,
6240 * then it is impossible to cross a block boundary.
6241 */
6242 if (sb->s_blocksize - offset < len) {
6243 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6244 " cancelled because not block aligned",
6245 (unsigned long long)off, (unsigned long long)len);
6246 return -EIO;
6247 }
6248
c5e298ae
TT		 6249 do {
6250 bh = ext4_bread(handle, inode, blk,
6251 EXT4_GET_BLOCKS_CREATE |
6252 EXT4_GET_BLOCKS_METADATA_NOFAIL);
45586c70 6253 } while (PTR_ERR(bh) == -ENOSPC &&
c5e298ae 6254 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 6255 if (IS_ERR(bh))
6256 return PTR_ERR(bh);
67eeb568
DM		 6257 if (!bh)
6258 goto out;
5d601255 6259 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 6260 err = ext4_journal_get_write_access(handle, bh);
6261 if (err) {
6262 brelse(bh);
1c215028 6263 return err;
ac27a0ec 6264 }
67eeb568
DM		 6265 lock_buffer(bh);
6266 memcpy(bh->b_data+offset, data, len);
6267 flush_dcache_page(bh->b_page);
6268 unlock_buffer(bh);
62d2b5f2 6269 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 6270 brelse(bh);
ac27a0ec 6271out:
67eeb568
DM		 6272 if (inode->i_size < off + len) {
6273 i_size_write(inode, off + len);
617ba13b 6274 EXT4_I(inode)->i_disksize = inode->i_size;
4209ae12
HS		 6275 err2 = ext4_mark_inode_dirty(handle, inode);
6276 if (unlikely(err2 && !err))
6277 err = err2;
ac27a0ec 6278 }
4209ae12 6279 return err ? err : len;
ac27a0ec 6280}
ac27a0ec
DK		 6281#endif
6282
152a0836
AV		 6283static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6284 const char *dev_name, void *data)
ac27a0ec 6285{
152a0836 6286 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 6287}
6288
c290ea01 6289#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 6290static inline void register_as_ext2(void)
6291{
6292 int err = register_filesystem(&ext2_fs_type);
6293 if (err)
6294 printk(KERN_WARNING
6295 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6296}
6297
6298static inline void unregister_as_ext2(void)
6299{
6300 unregister_filesystem(&ext2_fs_type);
6301}
2035e776
TT		 6302
6303static inline int ext2_feature_set_ok(struct super_block *sb)
6304{
e2b911c5 6305 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 6306 return 0;
bc98a42c 6307 if (sb_rdonly(sb))
2035e776 6308 return 1;
e2b911c5 6309 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 6310 return 0;
6311 return 1;
6312}
24b58424
TT		 6313#else
6314static inline void register_as_ext2(void) { }
6315static inline void unregister_as_ext2(void) { }
2035e776 6316static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 6317#endif
6318
24b58424
TT		 6319static inline void register_as_ext3(void)
6320{
6321 int err = register_filesystem(&ext3_fs_type);
6322 if (err)
6323 printk(KERN_WARNING
6324 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6325}
6326
6327static inline void unregister_as_ext3(void)
6328{
6329 unregister_filesystem(&ext3_fs_type);
6330}
2035e776
TT		 6331
6332static inline int ext3_feature_set_ok(struct super_block *sb)
6333{
e2b911c5 6334 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 6335 return 0;
e2b911c5 6336 if (!ext4_has_feature_journal(sb))
2035e776 6337 return 0;
bc98a42c 6338 if (sb_rdonly(sb))
2035e776 6339 return 1;
e2b911c5 6340 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 6341 return 0;
6342 return 1;
6343}
24b58424 6344
03010a33
TT		 6345static struct file_system_type ext4_fs_type = {
6346 .owner = THIS_MODULE,
6347 .name = "ext4",
152a0836 6348 .mount = ext4_mount,
03010a33
TT		 6349 .kill_sb = kill_block_super,
6350 .fs_flags = FS_REQUIRES_DEV,
6351};
7f78e035 6352MODULE_ALIAS_FS("ext4");
03010a33 6353
e9e3bcec
ES		 6354/* Shared across all ext4 file systems */
6355wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 6356
5dabfc78 6357static int __init ext4_init_fs(void)
ac27a0ec 6358{
e9e3bcec 6359 int i, err;
c9de560d 6360
e294a537 6361 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 6362 ext4_li_info = NULL;
6363 mutex_init(&ext4_li_mtx);
6364
9a4c8019 6365 /* Build-time check for flags consistency */
12e9b892 6366 ext4_check_flag_values();
e9e3bcec 6367
e142d052 6368 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 6369 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 6370
51865fda 6371 err = ext4_init_es();
6fd058f7
TT		 6372 if (err)
6373 return err;
51865fda 6374
1dc0aa46 6375 err = ext4_init_pending();
22cfe4b4
EB		 6376 if (err)
6377 goto out7;
6378
6379 err = ext4_init_post_read_processing();
1dc0aa46
EW		 6380 if (err)
6381 goto out6;
6382
51865fda
ZL		 6383 err = ext4_init_pageio();
6384 if (err)
b5799018 6385 goto out5;
51865fda 6386
5dabfc78 6387 err = ext4_init_system_zone();
bd2d0210 6388 if (err)
b5799018 6389 goto out4;
857ac889 6390
b5799018 6391 err = ext4_init_sysfs();
dd68314c 6392 if (err)
b5799018 6393 goto out3;
857ac889 6394
5dabfc78 6395 err = ext4_init_mballoc();
c9de560d
AT		 6396 if (err)
6397 goto out2;
ac27a0ec
DK		 6398 err = init_inodecache();
6399 if (err)
6400 goto out1;
24b58424 6401 register_as_ext3();
2035e776 6402 register_as_ext2();
03010a33 6403 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 6404 if (err)
6405 goto out;
bfff6873 6406
ac27a0ec
DK		 6407 return 0;
6408out:
24b58424
TT		 6409 unregister_as_ext2();
6410 unregister_as_ext3();
ac27a0ec
DK		 6411 destroy_inodecache();
6412out1:
5dabfc78 6413 ext4_exit_mballoc();
9c191f70 6414out2:
b5799018
TT		 6415 ext4_exit_sysfs();
6416out3:
5dabfc78 6417 ext4_exit_system_zone();
b5799018 6418out4:
5dabfc78 6419 ext4_exit_pageio();
b5799018 6420out5:
22cfe4b4 6421 ext4_exit_post_read_processing();
1dc0aa46 6422out6:
22cfe4b4
EB		 6423 ext4_exit_pending();
6424out7:
51865fda
ZL		 6425 ext4_exit_es();
6426
ac27a0ec
DK		 6427 return err;
6428}
6429
5dabfc78 6430static void __exit ext4_exit_fs(void)
ac27a0ec 6431{
bfff6873 6432 ext4_destroy_lazyinit_thread();
24b58424
TT		 6433 unregister_as_ext2();
6434 unregister_as_ext3();
03010a33 6435 unregister_filesystem(&ext4_fs_type);
ac27a0ec 6436 destroy_inodecache();
5dabfc78 6437 ext4_exit_mballoc();
b5799018 6438 ext4_exit_sysfs();
5dabfc78
TT		 6439 ext4_exit_system_zone();
6440 ext4_exit_pageio();
22cfe4b4 6441 ext4_exit_post_read_processing();
dd12ed14 6442 ext4_exit_es();
1dc0aa46 6443 ext4_exit_pending();
ac27a0ec
DK		 6444}
6445
6446MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 6447MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 6448MODULE_LICENSE("GPL");
7ef79ad5 6449MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 6450module_init(ext4_init_fs)
6451module_exit(ext4_exit_fs)
Linux 6.x block layer and io_uring tree(s)