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mm: add kernel_migrate_pages() helper, move compat syscall to mm/mempolicy.c
[mirror_ubuntu-hirsute-kernel.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>
ac27a0ec 45
bfff6873
LC		 46#include <linux/kthread.h>
47#include <linux/freezer.h>
48
3dcf5451 49#include "ext4.h"
4a092d73 50#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 51#include "ext4_jbd2.h"
ac27a0ec
DK		 52#include "xattr.h"
53#include "acl.h"
3661d286 54#include "mballoc.h"
0c9ec4be 55#include "fsmap.h"
ac27a0ec 56
9bffad1e
TT		 57#define CREATE_TRACE_POINTS
58#include <trace/events/ext4.h>
59
0b75a840
LC		 60static struct ext4_lazy_init *ext4_li_info;
61static struct mutex ext4_li_mtx;
e294a537 62static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 63
617ba13b 64static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 65 unsigned long journal_devnum);
2adf6da8 66static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 67static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 68static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
617ba13b 72static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
c6cb7e77
EW		 85static struct inode *ext4_get_journal_inode(struct super_block *sb,
86 unsigned int journal_inum);
ac27a0ec 87
e74031fd
JK		 88/*
89 * Lock ordering
90 *
91 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
92 * i_mmap_rwsem (inode->i_mmap_rwsem)!
93 *
94 * page fault path:
95 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
96 * page lock -> i_data_sem (rw)
97 *
98 * buffered write path:
99 * sb_start_write -> i_mutex -> mmap_sem
100 * sb_start_write -> i_mutex -> transaction start -> page lock ->
101 * i_data_sem (rw)
102 *
103 * truncate:
104 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
105 * i_mmap_rwsem (w) -> page lock
106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
107 * transaction start -> i_data_sem (rw)
108 *
109 * direct IO:
110 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
111 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
112 * transaction start -> i_data_sem (rw)
113 *
114 * writepages:
115 * transaction start -> page lock(s) -> i_data_sem (rw)
116 */
117
c290ea01 118#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 119static struct file_system_type ext2_fs_type = {
120 .owner = THIS_MODULE,
121 .name = "ext2",
122 .mount = ext4_mount,
123 .kill_sb = kill_block_super,
124 .fs_flags = FS_REQUIRES_DEV,
125};
7f78e035 126MODULE_ALIAS_FS("ext2");
fa7614dd 127MODULE_ALIAS("ext2");
2035e776
TT		 128#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
129#else
130#define IS_EXT2_SB(sb) (0)
131#endif
132
133
ba69f9ab
JK		 134static struct file_system_type ext3_fs_type = {
135 .owner = THIS_MODULE,
136 .name = "ext3",
152a0836 137 .mount = ext4_mount,
ba69f9ab
JK		 138 .kill_sb = kill_block_super,
139 .fs_flags = FS_REQUIRES_DEV,
140};
7f78e035 141MODULE_ALIAS_FS("ext3");
fa7614dd 142MODULE_ALIAS("ext3");
ba69f9ab 143#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 144
d25425f8
DW		 145static int ext4_verify_csum_type(struct super_block *sb,
146 struct ext4_super_block *es)
147{
e2b911c5 148 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 149 return 1;
150
151 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
152}
153
a9c47317
DW		 154static __le32 ext4_superblock_csum(struct super_block *sb,
155 struct ext4_super_block *es)
156{
157 struct ext4_sb_info *sbi = EXT4_SB(sb);
158 int offset = offsetof(struct ext4_super_block, s_checksum);
159 __u32 csum;
160
161 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
162
163 return cpu_to_le32(csum);
164}
165
c197855e
SH		 166static int ext4_superblock_csum_verify(struct super_block *sb,
167 struct ext4_super_block *es)
a9c47317 168{
9aa5d32b 169 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 170 return 1;
171
172 return es->s_checksum == ext4_superblock_csum(sb, es);
173}
174
06db49e6 175void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 176{
06db49e6
TT		 177 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
178
9aa5d32b 179 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 180 return;
181
182 es->s_checksum = ext4_superblock_csum(sb, es);
183}
184
9933fc0a
TT		 185void *ext4_kvmalloc(size_t size, gfp_t flags)
186{
187 void *ret;
188
8be04b93 189 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 190 if (!ret)
191 ret = __vmalloc(size, flags, PAGE_KERNEL);
192 return ret;
193}
194
195void *ext4_kvzalloc(size_t size, gfp_t flags)
196{
197 void *ret;
198
8be04b93 199 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 200 if (!ret)
201 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
202 return ret;
203}
204
8fadc143
AR		 205ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
206 struct ext4_group_desc *bg)
bd81d8ee 207{
3a14589c 208 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 209 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 210 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 211}
212
8fadc143
AR		 213ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
214 struct ext4_group_desc *bg)
bd81d8ee 215{
5272f837 216 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 217 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 218 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 219}
220
8fadc143
AR		 221ext4_fsblk_t ext4_inode_table(struct super_block *sb,
222 struct ext4_group_desc *bg)
bd81d8ee 223{
5272f837 224 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 225 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 226 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 227}
228
021b65bb
TT		 229__u32 ext4_free_group_clusters(struct super_block *sb,
230 struct ext4_group_desc *bg)
560671a0
AK		 231{
232 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
233 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 234 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 235}
236
237__u32 ext4_free_inodes_count(struct super_block *sb,
238 struct ext4_group_desc *bg)
239{
240 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
241 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 242 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 243}
244
245__u32 ext4_used_dirs_count(struct super_block *sb,
246 struct ext4_group_desc *bg)
247{
248 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
249 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 250 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 251}
252
253__u32 ext4_itable_unused_count(struct super_block *sb,
254 struct ext4_group_desc *bg)
255{
256 return le16_to_cpu(bg->bg_itable_unused_lo) |
257 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 258 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 259}
260
8fadc143
AR		 261void ext4_block_bitmap_set(struct super_block *sb,
262 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 263{
3a14589c 264 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 265 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
266 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 267}
268
8fadc143
AR		 269void ext4_inode_bitmap_set(struct super_block *sb,
270 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 271{
5272f837 272 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 273 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
274 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 275}
276
8fadc143
AR		 277void ext4_inode_table_set(struct super_block *sb,
278 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 279{
5272f837 280 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 281 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
282 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 283}
284
021b65bb
TT		 285void ext4_free_group_clusters_set(struct super_block *sb,
286 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 287{
288 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
289 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
290 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
291}
292
293void ext4_free_inodes_set(struct super_block *sb,
294 struct ext4_group_desc *bg, __u32 count)
295{
296 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
297 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
298 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
299}
300
301void ext4_used_dirs_set(struct super_block *sb,
302 struct ext4_group_desc *bg, __u32 count)
303{
304 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
305 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
306 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
307}
308
309void ext4_itable_unused_set(struct super_block *sb,
310 struct ext4_group_desc *bg, __u32 count)
311{
312 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
313 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
314 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
315}
316
d3d1faf6 317
1c13d5c0
TT		 318static void __save_error_info(struct super_block *sb, const char *func,
319 unsigned int line)
320{
321 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
322
323 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 324 if (bdev_read_only(sb->s_bdev))
325 return;
1c13d5c0
TT		 326 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
327 es->s_last_error_time = cpu_to_le32(get_seconds());
328 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
329 es->s_last_error_line = cpu_to_le32(line);
330 if (!es->s_first_error_time) {
331 es->s_first_error_time = es->s_last_error_time;
332 strncpy(es->s_first_error_func, func,
333 sizeof(es->s_first_error_func));
334 es->s_first_error_line = cpu_to_le32(line);
335 es->s_first_error_ino = es->s_last_error_ino;
336 es->s_first_error_block = es->s_last_error_block;
337 }
66e61a9e
TT		 338 /*
339 * Start the daily error reporting function if it hasn't been
340 * started already
341 */
342 if (!es->s_error_count)
343 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 344 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 345}
346
347static void save_error_info(struct super_block *sb, const char *func,
348 unsigned int line)
349{
350 __save_error_info(sb, func, line);
351 ext4_commit_super(sb, 1);
352}
353
bdfe0cbd
TT		 354/*
355 * The del_gendisk() function uninitializes the disk-specific data
356 * structures, including the bdi structure, without telling anyone
357 * else. Once this happens, any attempt to call mark_buffer_dirty()
358 * (for example, by ext4_commit_super), will cause a kernel OOPS.
359 * This is a kludge to prevent these oops until we can put in a proper
360 * hook in del_gendisk() to inform the VFS and file system layers.
361 */
362static int block_device_ejected(struct super_block *sb)
363{
364 struct inode *bd_inode = sb->s_bdev->bd_inode;
365 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
366
367 return bdi->dev == NULL;
368}
369
18aadd47
BJ		 370static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
371{
372 struct super_block *sb = journal->j_private;
373 struct ext4_sb_info *sbi = EXT4_SB(sb);
374 int error = is_journal_aborted(journal);
5d3ee208 375 struct ext4_journal_cb_entry *jce;
18aadd47 376
5d3ee208 377 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 378
379 ext4_process_freed_data(sb, txn->t_tid);
380
18aadd47 381 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 382 while (!list_empty(&txn->t_private_list)) {
383 jce = list_entry(txn->t_private_list.next,
384 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 385 list_del_init(&jce->jce_list);
386 spin_unlock(&sbi->s_md_lock);
387 jce->jce_func(sb, jce, error);
388 spin_lock(&sbi->s_md_lock);
389 }
390 spin_unlock(&sbi->s_md_lock);
391}
1c13d5c0 392
ac27a0ec
DK		 393/* Deal with the reporting of failure conditions on a filesystem such as
394 * inconsistencies detected or read IO failures.
395 *
396 * On ext2, we can store the error state of the filesystem in the
617ba13b 397 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 398 * write ordering constraints on the superblock which prevent us from
399 * writing it out straight away; and given that the journal is about to
400 * be aborted, we can't rely on the current, or future, transactions to
401 * write out the superblock safely.
402 *
dab291af 403 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 404 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 405 * that error until we've noted it down and cleared it.
406 */
407
617ba13b 408static void ext4_handle_error(struct super_block *sb)
ac27a0ec 409{
bc98a42c 410 if (sb_rdonly(sb))
ac27a0ec
DK		 411 return;
412
2b2d6d01 413 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 414 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 415
4ab2f15b 416 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 417 if (journal)
dab291af 418 jbd2_journal_abort(journal, -EIO);
ac27a0ec 419 }
2b2d6d01 420 if (test_opt(sb, ERRORS_RO)) {
b31e1552 421 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 422 /*
423 * Make sure updated value of ->s_mount_flags will be visible
424 * before ->s_flags update
425 */
426 smp_wmb();
1751e8a6 427 sb->s_flags |= SB_RDONLY;
ac27a0ec 428 }
4327ba52
DJ		 429 if (test_opt(sb, ERRORS_PANIC)) {
430 if (EXT4_SB(sb)->s_journal &&
431 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
432 return;
617ba13b 433 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 434 sb->s_id);
4327ba52 435 }
ac27a0ec
DK		 436}
437
efbed4dc
TT		 438#define ext4_error_ratelimit(sb) \
439 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
440 "EXT4-fs error")
441
12062ddd 442void __ext4_error(struct super_block *sb, const char *function,
c398eda0 443 unsigned int line, const char *fmt, ...)
ac27a0ec 444{
0ff2ea7d 445 struct va_format vaf;
ac27a0ec
DK		 446 va_list args;
447
0db1ff22
TT		 448 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
449 return;
450
efbed4dc
TT		 451 if (ext4_error_ratelimit(sb)) {
452 va_start(args, fmt);
453 vaf.fmt = fmt;
454 vaf.va = &args;
455 printk(KERN_CRIT
456 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
457 sb->s_id, function, line, current->comm, &vaf);
458 va_end(args);
459 }
f3fc0210 460 save_error_info(sb, function, line);
617ba13b 461 ext4_handle_error(sb);
ac27a0ec
DK		 462}
463
e7c96e8e
JP		 464void __ext4_error_inode(struct inode *inode, const char *function,
465 unsigned int line, ext4_fsblk_t block,
466 const char *fmt, ...)
273df556
FM		 467{
468 va_list args;
f7c21177 469 struct va_format vaf;
1c13d5c0 470 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 471
0db1ff22
TT		 472 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
473 return;
474
1c13d5c0
TT		 475 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
476 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 477 if (ext4_error_ratelimit(inode->i_sb)) {
478 va_start(args, fmt);
479 vaf.fmt = fmt;
480 vaf.va = &args;
481 if (block)
482 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
483 "inode #%lu: block %llu: comm %s: %pV\n",
484 inode->i_sb->s_id, function, line, inode->i_ino,
485 block, current->comm, &vaf);
486 else
487 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
488 "inode #%lu: comm %s: %pV\n",
489 inode->i_sb->s_id, function, line, inode->i_ino,
490 current->comm, &vaf);
491 va_end(args);
492 }
1c13d5c0 493 save_error_info(inode->i_sb, function, line);
273df556
FM		 494 ext4_handle_error(inode->i_sb);
495}
496
e7c96e8e
JP		 497void __ext4_error_file(struct file *file, const char *function,
498 unsigned int line, ext4_fsblk_t block,
499 const char *fmt, ...)
273df556
FM		 500{
501 va_list args;
f7c21177 502 struct va_format vaf;
1c13d5c0 503 struct ext4_super_block *es;
496ad9aa 504 struct inode *inode = file_inode(file);
273df556
FM		 505 char pathname[80], *path;
506
0db1ff22
TT		 507 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
508 return;
509
1c13d5c0
TT		 510 es = EXT4_SB(inode->i_sb)->s_es;
511 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 512 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 513 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 514 if (IS_ERR(path))
515 path = "(unknown)";
516 va_start(args, fmt);
517 vaf.fmt = fmt;
518 vaf.va = &args;
519 if (block)
520 printk(KERN_CRIT
521 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
522 "block %llu: comm %s: path %s: %pV\n",
523 inode->i_sb->s_id, function, line, inode->i_ino,
524 block, current->comm, path, &vaf);
525 else
526 printk(KERN_CRIT
527 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
528 "comm %s: path %s: %pV\n",
529 inode->i_sb->s_id, function, line, inode->i_ino,
530 current->comm, path, &vaf);
531 va_end(args);
532 }
1c13d5c0 533 save_error_info(inode->i_sb, function, line);
273df556
FM		 534 ext4_handle_error(inode->i_sb);
535}
536
722887dd
TT		 537const char *ext4_decode_error(struct super_block *sb, int errno,
538 char nbuf[16])
ac27a0ec
DK		 539{
540 char *errstr = NULL;
541
542 switch (errno) {
6a797d27
DW		 543 case -EFSCORRUPTED:
544 errstr = "Corrupt filesystem";
545 break;
546 case -EFSBADCRC:
547 errstr = "Filesystem failed CRC";
548 break;
ac27a0ec
DK		 549 case -EIO:
550 errstr = "IO failure";
551 break;
552 case -ENOMEM:
553 errstr = "Out of memory";
554 break;
555 case -EROFS:
78f1ddbb
TT		 556 if (!sb || (EXT4_SB(sb)->s_journal &&
557 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 558 errstr = "Journal has aborted";
559 else
560 errstr = "Readonly filesystem";
561 break;
562 default:
563 /* If the caller passed in an extra buffer for unknown
564 * errors, textualise them now. Else we just return
565 * NULL. */
566 if (nbuf) {
567 /* Check for truncated error codes... */
568 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
569 errstr = nbuf;
570 }
571 break;
572 }
573
574 return errstr;
575}
576
617ba13b 577/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 578 * automatically and invokes the appropriate error response. */
579
c398eda0
TT		 580void __ext4_std_error(struct super_block *sb, const char *function,
581 unsigned int line, int errno)
ac27a0ec
DK		 582{
583 char nbuf[16];
584 const char *errstr;
585
0db1ff22
TT		 586 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
587 return;
588
ac27a0ec
DK		 589 /* Special case: if the error is EROFS, and we're not already
590 * inside a transaction, then there's really no point in logging
591 * an error. */
bc98a42c 592 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 593 return;
594
efbed4dc
TT		 595 if (ext4_error_ratelimit(sb)) {
596 errstr = ext4_decode_error(sb, errno, nbuf);
597 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
598 sb->s_id, function, line, errstr);
599 }
ac27a0ec 600
efbed4dc 601 save_error_info(sb, function, line);
617ba13b 602 ext4_handle_error(sb);
ac27a0ec
DK		 603}
604
605/*
617ba13b 606 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 607 * abort function may be used to deal with unrecoverable failures such
608 * as journal IO errors or ENOMEM at a critical moment in log management.
609 *
610 * We unconditionally force the filesystem into an ABORT|READONLY state,
611 * unless the error response on the fs has been set to panic in which
612 * case we take the easy way out and panic immediately.
613 */
614
c67d859e 615void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 616 unsigned int line, const char *fmt, ...)
ac27a0ec 617{
651e1c3b 618 struct va_format vaf;
ac27a0ec
DK		 619 va_list args;
620
0db1ff22
TT		 621 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
622 return;
623
1c13d5c0 624 save_error_info(sb, function, line);
ac27a0ec 625 va_start(args, fmt);
651e1c3b
JP		 626 vaf.fmt = fmt;
627 vaf.va = &args;
628 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
629 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 630 va_end(args);
631
bc98a42c 632 if (sb_rdonly(sb) == 0) {
1c13d5c0 633 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 634 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 635 /*
636 * Make sure updated value of ->s_mount_flags will be visible
637 * before ->s_flags update
638 */
639 smp_wmb();
1751e8a6 640 sb->s_flags |= SB_RDONLY;
1c13d5c0
TT		 641 if (EXT4_SB(sb)->s_journal)
642 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
643 save_error_info(sb, function, line);
644 }
4327ba52
DJ		 645 if (test_opt(sb, ERRORS_PANIC)) {
646 if (EXT4_SB(sb)->s_journal &&
647 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
648 return;
617ba13b 649 panic("EXT4-fs panic from previous error\n");
4327ba52 650 }
ac27a0ec
DK		 651}
652
e7c96e8e
JP		 653void __ext4_msg(struct super_block *sb,
654 const char *prefix, const char *fmt, ...)
b31e1552 655{
0ff2ea7d 656 struct va_format vaf;
b31e1552
ES		 657 va_list args;
658
efbed4dc
TT		 659 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
660 return;
661
b31e1552 662 va_start(args, fmt);
0ff2ea7d
JP		 663 vaf.fmt = fmt;
664 vaf.va = &args;
665 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 666 va_end(args);
667}
668
b03a2f7e
AD		 669#define ext4_warning_ratelimit(sb) \
670 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
671 "EXT4-fs warning")
672
12062ddd 673void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 674 unsigned int line, const char *fmt, ...)
ac27a0ec 675{
0ff2ea7d 676 struct va_format vaf;
ac27a0ec
DK		 677 va_list args;
678
b03a2f7e 679 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 680 return;
681
ac27a0ec 682 va_start(args, fmt);
0ff2ea7d
JP		 683 vaf.fmt = fmt;
684 vaf.va = &args;
685 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
686 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 687 va_end(args);
688}
689
b03a2f7e
AD		 690void __ext4_warning_inode(const struct inode *inode, const char *function,
691 unsigned int line, const char *fmt, ...)
692{
693 struct va_format vaf;
694 va_list args;
695
696 if (!ext4_warning_ratelimit(inode->i_sb))
697 return;
698
699 va_start(args, fmt);
700 vaf.fmt = fmt;
701 vaf.va = &args;
702 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
703 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
704 function, line, inode->i_ino, current->comm, &vaf);
705 va_end(args);
706}
707
e29136f8
TT		 708void __ext4_grp_locked_error(const char *function, unsigned int line,
709 struct super_block *sb, ext4_group_t grp,
710 unsigned long ino, ext4_fsblk_t block,
711 const char *fmt, ...)
5d1b1b3f
AK		 712__releases(bitlock)
713__acquires(bitlock)
714{
0ff2ea7d 715 struct va_format vaf;
5d1b1b3f
AK		 716 va_list args;
717 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
718
0db1ff22
TT		 719 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
720 return;
721
1c13d5c0
TT		 722 es->s_last_error_ino = cpu_to_le32(ino);
723 es->s_last_error_block = cpu_to_le64(block);
724 __save_error_info(sb, function, line);
0ff2ea7d 725
efbed4dc
TT		 726 if (ext4_error_ratelimit(sb)) {
727 va_start(args, fmt);
728 vaf.fmt = fmt;
729 vaf.va = &args;
730 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
731 sb->s_id, function, line, grp);
732 if (ino)
733 printk(KERN_CONT "inode %lu: ", ino);
734 if (block)
735 printk(KERN_CONT "block %llu:",
736 (unsigned long long) block);
737 printk(KERN_CONT "%pV\n", &vaf);
738 va_end(args);
739 }
5d1b1b3f
AK		 740
741 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 742 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 743 return;
744 }
1c13d5c0 745
5d1b1b3f 746 ext4_unlock_group(sb, grp);
06f29cc8 747 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 748 ext4_handle_error(sb);
749 /*
750 * We only get here in the ERRORS_RO case; relocking the group
751 * may be dangerous, but nothing bad will happen since the
752 * filesystem will have already been marked read/only and the
753 * journal has been aborted. We return 1 as a hint to callers
754 * who might what to use the return value from
25985edc 755 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 756 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
757 * aggressively from the ext4 function in question, with a
758 * more appropriate error code.
759 */
760 ext4_lock_group(sb, grp);
761 return;
762}
763
617ba13b 764void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 765{
617ba13b 766 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 767
617ba13b 768 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 769 return;
770
12062ddd 771 ext4_warning(sb,
ac27a0ec
DK		 772 "updating to rev %d because of new feature flag, "
773 "running e2fsck is recommended",
617ba13b 774 EXT4_DYNAMIC_REV);
ac27a0ec 775
617ba13b
MC		 776 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
777 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
778 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 779 /* leave es->s_feature_*compat flags alone */
780 /* es->s_uuid will be set by e2fsck if empty */
781
782 /*
783 * The rest of the superblock fields should be zero, and if not it
784 * means they are likely already in use, so leave them alone. We
785 * can leave it up to e2fsck to clean up any inconsistencies there.
786 */
787}
788
789/*
790 * Open the external journal device
791 */
b31e1552 792static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 793{
794 struct block_device *bdev;
795 char b[BDEVNAME_SIZE];
796
d4d77629 797 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 798 if (IS_ERR(bdev))
799 goto fail;
800 return bdev;
801
802fail:
b31e1552 803 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 804 __bdevname(dev, b), PTR_ERR(bdev));
805 return NULL;
806}
807
808/*
809 * Release the journal device
810 */
4385bab1 811static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 812{
4385bab1 813 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 814}
815
4385bab1 816static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 817{
818 struct block_device *bdev;
ac27a0ec
DK		 819 bdev = sbi->journal_bdev;
820 if (bdev) {
4385bab1 821 ext4_blkdev_put(bdev);
ac27a0ec
DK		 822 sbi->journal_bdev = NULL;
823 }
ac27a0ec
DK		 824}
825
826static inline struct inode *orphan_list_entry(struct list_head *l)
827{
617ba13b 828 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 829}
830
617ba13b 831static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 832{
833 struct list_head *l;
834
b31e1552
ES		 835 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
836 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 837
838 printk(KERN_ERR "sb_info orphan list:\n");
839 list_for_each(l, &sbi->s_orphan) {
840 struct inode *inode = orphan_list_entry(l);
841 printk(KERN_ERR " "
842 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
843 inode->i_sb->s_id, inode->i_ino, inode,
844 inode->i_mode, inode->i_nlink,
845 NEXT_ORPHAN(inode));
846 }
847}
848
957153fc
JK		 849#ifdef CONFIG_QUOTA
850static int ext4_quota_off(struct super_block *sb, int type);
851
852static inline void ext4_quota_off_umount(struct super_block *sb)
853{
854 int type;
855
964edf66
JK		 856 /* Use our quota_off function to clear inode flags etc. */
857 for (type = 0; type < EXT4_MAXQUOTAS; type++)
858 ext4_quota_off(sb, type);
957153fc
JK		 859}
860#else
861static inline void ext4_quota_off_umount(struct super_block *sb)
862{
863}
864#endif
865
2b2d6d01 866static void ext4_put_super(struct super_block *sb)
ac27a0ec 867{
617ba13b
MC		 868 struct ext4_sb_info *sbi = EXT4_SB(sb);
869 struct ext4_super_block *es = sbi->s_es;
97abd7d4 870 int aborted = 0;
ef2cabf7 871 int i, err;
ac27a0ec 872
857ac889 873 ext4_unregister_li_request(sb);
957153fc 874 ext4_quota_off_umount(sb);
e0ccfd95 875
2e8fa54e 876 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 877
0390131b 878 if (sbi->s_journal) {
97abd7d4 879 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 880 err = jbd2_journal_destroy(sbi->s_journal);
881 sbi->s_journal = NULL;
97abd7d4 882 if ((err < 0) && !aborted)
c67d859e 883 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 884 }
d4edac31 885
ebd173be 886 ext4_unregister_sysfs(sb);
d3922a77 887 ext4_es_unregister_shrinker(sbi);
9105bb14 888 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 889 ext4_release_system_zone(sb);
890 ext4_mb_release(sb);
891 ext4_ext_release(sb);
d4edac31 892
bc98a42c 893 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 894 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 895 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 896 }
bc98a42c 897 if (!sb_rdonly(sb))
a8e25a83
AB		 898 ext4_commit_super(sb, 1);
899
ac27a0ec
DK		 900 for (i = 0; i < sbi->s_gdb_count; i++)
901 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 902 kvfree(sbi->s_group_desc);
903 kvfree(sbi->s_flex_groups);
57042651 904 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 905 percpu_counter_destroy(&sbi->s_freeinodes_counter);
906 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 907 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 908 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 909#ifdef CONFIG_QUOTA
a2d4a646 910 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 911 kfree(sbi->s_qf_names[i]);
912#endif
913
914 /* Debugging code just in case the in-memory inode orphan list
915 * isn't empty. The on-disk one can be non-empty if we've
916 * detected an error and taken the fs readonly, but the
917 * in-memory list had better be clean by this point. */
918 if (!list_empty(&sbi->s_orphan))
919 dump_orphan_list(sb, sbi);
920 J_ASSERT(list_empty(&sbi->s_orphan));
921
89d96a6f 922 sync_blockdev(sb->s_bdev);
f98393a6 923 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 924 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
925 /*
926 * Invalidate the journal device's buffers. We don't want them
927 * floating about in memory - the physical journal device may
928 * hotswapped, and it breaks the `ro-after' testing code.
929 */
930 sync_blockdev(sbi->journal_bdev);
f98393a6 931 invalidate_bdev(sbi->journal_bdev);
617ba13b 932 ext4_blkdev_remove(sbi);
ac27a0ec 933 }
dec214d0
TE		 934 if (sbi->s_ea_inode_cache) {
935 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
936 sbi->s_ea_inode_cache = NULL;
937 }
47387409
TE		 938 if (sbi->s_ea_block_cache) {
939 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
940 sbi->s_ea_block_cache = NULL;
9c191f70 941 }
c5e06d10
JL		 942 if (sbi->s_mmp_tsk)
943 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 944 brelse(sbi->s_sbh);
ac27a0ec 945 sb->s_fs_info = NULL;
3197ebdb
TT		 946 /*
947 * Now that we are completely done shutting down the
948 * superblock, we need to actually destroy the kobject.
949 */
3197ebdb
TT		 950 kobject_put(&sbi->s_kobj);
951 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 952 if (sbi->s_chksum_driver)
953 crypto_free_shash(sbi->s_chksum_driver);
705895b6 954 kfree(sbi->s_blockgroup_lock);
5e405595 955 fs_put_dax(sbi->s_daxdev);
ac27a0ec 956 kfree(sbi);
ac27a0ec
DK		 957}
958
e18b890b 959static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 960
961/*
962 * Called inside transaction, so use GFP_NOFS
963 */
617ba13b 964static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 965{
617ba13b 966 struct ext4_inode_info *ei;
ac27a0ec 967
e6b4f8da 968 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 969 if (!ei)
970 return NULL;
0b8e58a1 971
ee73f9a5 972 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 973 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 974 INIT_LIST_HEAD(&ei->i_prealloc_list);
975 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 976 ext4_es_init_tree(&ei->i_es_tree);
977 rwlock_init(&ei->i_es_lock);
edaa53ca 978 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 979 ei->i_es_all_nr = 0;
edaa53ca 980 ei->i_es_shk_nr = 0;
dd475925 981 ei->i_es_shrink_lblk = 0;
d2a17637 982 ei->i_reserved_data_blocks = 0;
9d0be502 983 ei->i_da_metadata_calc_len = 0;
7e731bc9 984 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 985 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 986#ifdef CONFIG_QUOTA
987 ei->i_reserved_quota = 0;
96c7e0d9 988 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 989#endif
8aefcd55 990 ei->jinode = NULL;
2e8fa54e 991 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 992 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 993 ei->i_sync_tid = 0;
994 ei->i_datasync_tid = 0;
e27f41e1 995 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 996 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 997 return &ei->vfs_inode;
998}
999
7ff9c073
TT		 1000static int ext4_drop_inode(struct inode *inode)
1001{
1002 int drop = generic_drop_inode(inode);
1003
1004 trace_ext4_drop_inode(inode, drop);
1005 return drop;
1006}
1007
fa0d7e3d
NP		 1008static void ext4_i_callback(struct rcu_head *head)
1009{
1010 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 1011 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1012}
1013
617ba13b 1014static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1015{
9f7dd93d 1016 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1017 ext4_msg(inode->i_sb, KERN_ERR,
1018 "Inode %lu (%p): orphan list check failed!",
1019 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1020 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1021 EXT4_I(inode), sizeof(struct ext4_inode_info),
1022 true);
1023 dump_stack();
1024 }
fa0d7e3d 1025 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1026}
1027
51cc5068 1028static void init_once(void *foo)
ac27a0ec 1029{
617ba13b 1030 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1031
a35afb83 1032 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1033 init_rwsem(&ei->xattr_sem);
0e855ac8 1034 init_rwsem(&ei->i_data_sem);
ea3d7209 1035 init_rwsem(&ei->i_mmap_sem);
a35afb83 1036 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1037}
1038
e67bc2b3 1039static int __init init_inodecache(void)
ac27a0ec 1040{
f8dd7c70
DW		 1041 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1042 sizeof(struct ext4_inode_info), 0,
1043 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1044 SLAB_ACCOUNT),
1045 offsetof(struct ext4_inode_info, i_data),
1046 sizeof_field(struct ext4_inode_info, i_data),
1047 init_once);
617ba13b 1048 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1049 return -ENOMEM;
1050 return 0;
1051}
1052
1053static void destroy_inodecache(void)
1054{
8c0a8537
KS		 1055 /*
1056 * Make sure all delayed rcu free inodes are flushed before we
1057 * destroy cache.
1058 */
1059 rcu_barrier();
617ba13b 1060 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1061}
1062
0930fcc1 1063void ext4_clear_inode(struct inode *inode)
ac27a0ec 1064{
0930fcc1 1065 invalidate_inode_buffers(inode);
dbd5768f 1066 clear_inode(inode);
9f754758 1067 dquot_drop(inode);
c2ea3fde 1068 ext4_discard_preallocations(inode);
51865fda 1069 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1070 if (EXT4_I(inode)->jinode) {
1071 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1072 EXT4_I(inode)->jinode);
1073 jbd2_free_inode(EXT4_I(inode)->jinode);
1074 EXT4_I(inode)->jinode = NULL;
1075 }
3d204e24 1076 fscrypt_put_encryption_info(inode);
ac27a0ec
DK		 1077}
1078
1b961ac0 1079static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1080 u64 ino, u32 generation)
ac27a0ec 1081{
ac27a0ec 1082 struct inode *inode;
ac27a0ec 1083
617ba13b 1084 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1085 return ERR_PTR(-ESTALE);
617ba13b 1086 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1087 return ERR_PTR(-ESTALE);
1088
1089 /* iget isn't really right if the inode is currently unallocated!!
1090 *
617ba13b 1091 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1092 * deleted, so we should be safe.
1093 *
1094 * Currently we don't know the generation for parent directory, so
1095 * a generation of 0 means "accept any"
1096 */
f4bb2981 1097 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1098 if (IS_ERR(inode))
1099 return ERR_CAST(inode);
1100 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1101 iput(inode);
1102 return ERR_PTR(-ESTALE);
1103 }
1b961ac0
CH		 1104
1105 return inode;
1106}
1107
1108static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1109 int fh_len, int fh_type)
1b961ac0
CH		 1110{
1111 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1112 ext4_nfs_get_inode);
1113}
1114
1115static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1116 int fh_len, int fh_type)
1b961ac0
CH		 1117{
1118 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1119 ext4_nfs_get_inode);
ac27a0ec
DK		 1120}
1121
c39a7f84
TO		 1122/*
1123 * Try to release metadata pages (indirect blocks, directories) which are
1124 * mapped via the block device. Since these pages could have journal heads
1125 * which would prevent try_to_free_buffers() from freeing them, we must use
1126 * jbd2 layer's try_to_free_buffers() function to release them.
1127 */
0b8e58a1
AD		 1128static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1129 gfp_t wait)
c39a7f84
TO		 1130{
1131 journal_t *journal = EXT4_SB(sb)->s_journal;
1132
1133 WARN_ON(PageChecked(page));
1134 if (!page_has_buffers(page))
1135 return 0;
1136 if (journal)
1137 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1138 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1139 return try_to_free_buffers(page);
1140}
1141
a7550b30
JK		 1142#ifdef CONFIG_EXT4_FS_ENCRYPTION
1143static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1144{
1145 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1146 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1147}
1148
a7550b30
JK		 1149static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1150 void *fs_data)
1151{
2f8f5e76 1152 handle_t *handle = fs_data;
c1a5d5f6 1153 int res, res2, credits, retries = 0;
2f8f5e76 1154
9ce0151a
EB		 1155 /*
1156 * Encrypting the root directory is not allowed because e2fsck expects
1157 * lost+found to exist and be unencrypted, and encrypting the root
1158 * directory would imply encrypting the lost+found directory as well as
1159 * the filename "lost+found" itself.
1160 */
1161 if (inode->i_ino == EXT4_ROOT_INO)
1162 return -EPERM;
2f8f5e76 1163
7d3e06a8
RZ		 1164 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1165 return -EINVAL;
1166
94840e3c
EB		 1167 res = ext4_convert_inline_data(inode);
1168 if (res)
1169 return res;
1170
2f8f5e76
EB		 1171 /*
1172 * If a journal handle was specified, then the encryption context is
1173 * being set on a new inode via inheritance and is part of a larger
1174 * transaction to create the inode. Otherwise the encryption context is
1175 * being set on an existing inode in its own transaction. Only in the
1176 * latter case should the "retry on ENOSPC" logic be used.
1177 */
a7550b30 1178
2f8f5e76
EB		 1179 if (handle) {
1180 res = ext4_xattr_set_handle(handle, inode,
1181 EXT4_XATTR_INDEX_ENCRYPTION,
1182 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1183 ctx, len, 0);
a7550b30
JK		 1184 if (!res) {
1185 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1186 ext4_clear_inode_state(inode,
1187 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1188 /*
2ee6a576
EB		 1189 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1190 * S_DAX may be disabled
a3caa24b
JK		 1191 */
1192 ext4_set_inode_flags(inode);
a7550b30
JK		 1193 }
1194 return res;
1195 }
1196
b8cb5a54
TE		 1197 res = dquot_initialize(inode);
1198 if (res)
1199 return res;
2f8f5e76 1200retry:
af65207c
TE		 1201 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1202 &credits);
dec214d0
TE		 1203 if (res)
1204 return res;
1205
c1a5d5f6 1206 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1207 if (IS_ERR(handle))
1208 return PTR_ERR(handle);
1209
2f8f5e76
EB		 1210 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1211 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1212 ctx, len, 0);
a7550b30
JK		 1213 if (!res) {
1214 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1215 /*
1216 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1217 * S_DAX may be disabled
1218 */
a3caa24b 1219 ext4_set_inode_flags(inode);
a7550b30
JK		 1220 res = ext4_mark_inode_dirty(handle, inode);
1221 if (res)
1222 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1223 }
1224 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1225
1226 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1227 goto retry;
a7550b30
JK		 1228 if (!res)
1229 res = res2;
1230 return res;
1231}
1232
c250b7dd 1233static bool ext4_dummy_context(struct inode *inode)
a7550b30
JK		 1234{
1235 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1236}
1237
1238static unsigned ext4_max_namelen(struct inode *inode)
1239{
1240 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1241 EXT4_NAME_LEN;
1242}
1243
6f69f0ed 1244static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1245 .key_prefix = "ext4:",
a7550b30 1246 .get_context = ext4_get_context,
a7550b30
JK		 1247 .set_context = ext4_set_context,
1248 .dummy_context = ext4_dummy_context,
a7550b30
JK		 1249 .empty_dir = ext4_empty_dir,
1250 .max_namelen = ext4_max_namelen,
1251};
a7550b30
JK		 1252#endif
1253
ac27a0ec 1254#ifdef CONFIG_QUOTA
d6006186 1255static const char * const quotatypes[] = INITQFNAMES;
689c958c 1256#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1257
617ba13b
MC		 1258static int ext4_write_dquot(struct dquot *dquot);
1259static int ext4_acquire_dquot(struct dquot *dquot);
1260static int ext4_release_dquot(struct dquot *dquot);
1261static int ext4_mark_dquot_dirty(struct dquot *dquot);
1262static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1263static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1264 const struct path *path);
617ba13b
MC		 1265static int ext4_quota_on_mount(struct super_block *sb, int type);
1266static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1267 size_t len, loff_t off);
617ba13b 1268static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1269 const char *data, size_t len, loff_t off);
7c319d32
AK		 1270static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1271 unsigned int flags);
1272static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1273static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1274
96c7e0d9
JK		 1275static struct dquot **ext4_get_dquots(struct inode *inode)
1276{
1277 return EXT4_I(inode)->i_dquot;
1278}
1279
61e225dc 1280static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1281 .get_reserved_space = ext4_get_reserved_space,
1282 .write_dquot = ext4_write_dquot,
1283 .acquire_dquot = ext4_acquire_dquot,
1284 .release_dquot = ext4_release_dquot,
1285 .mark_dirty = ext4_mark_dquot_dirty,
1286 .write_info = ext4_write_info,
1287 .alloc_dquot = dquot_alloc,
1288 .destroy_dquot = dquot_destroy,
1289 .get_projid = ext4_get_projid,
1290 .get_inode_usage = ext4_get_inode_usage,
1291 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1292};
1293
0d54b217 1294static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1295 .quota_on = ext4_quota_on,
ca0e05e4 1296 .quota_off = ext4_quota_off,
287a8095 1297 .quota_sync = dquot_quota_sync,
0a240339 1298 .get_state = dquot_get_state,
287a8095
CH		 1299 .set_info = dquot_set_dqinfo,
1300 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1301 .set_dqblk = dquot_set_dqblk,
1302 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1303};
1304#endif
1305
ee9b6d61 1306static const struct super_operations ext4_sops = {
617ba13b
MC		 1307 .alloc_inode = ext4_alloc_inode,
1308 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1309 .write_inode = ext4_write_inode,
1310 .dirty_inode = ext4_dirty_inode,
7ff9c073 1311 .drop_inode = ext4_drop_inode,
0930fcc1 1312 .evict_inode = ext4_evict_inode,
617ba13b 1313 .put_super = ext4_put_super,
617ba13b 1314 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1315 .freeze_fs = ext4_freeze,
1316 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1317 .statfs = ext4_statfs,
1318 .remount_fs = ext4_remount,
617ba13b 1319 .show_options = ext4_show_options,
ac27a0ec 1320#ifdef CONFIG_QUOTA
617ba13b
MC		 1321 .quota_read = ext4_quota_read,
1322 .quota_write = ext4_quota_write,
96c7e0d9 1323 .get_dquots = ext4_get_dquots,
ac27a0ec 1324#endif
c39a7f84 1325 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1326};
1327
39655164 1328static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1329 .fh_to_dentry = ext4_fh_to_dentry,
1330 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1331 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1332};
1333
1334enum {
1335 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1336 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1337 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1338 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1339 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1340 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1341 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1342 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1343 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1344 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1345 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1346 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1347 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1449032b 1348 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
670e9875 1349 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1350 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1351 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1352 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1353 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1354 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
ac27a0ec
DK		 1355};
1356
a447c093 1357static const match_table_t tokens = {
ac27a0ec
DK		 1358 {Opt_bsd_df, "bsddf"},
1359 {Opt_minix_df, "minixdf"},
1360 {Opt_grpid, "grpid"},
1361 {Opt_grpid, "bsdgroups"},
1362 {Opt_nogrpid, "nogrpid"},
1363 {Opt_nogrpid, "sysvgroups"},
1364 {Opt_resgid, "resgid=%u"},
1365 {Opt_resuid, "resuid=%u"},
1366 {Opt_sb, "sb=%u"},
1367 {Opt_err_cont, "errors=continue"},
1368 {Opt_err_panic, "errors=panic"},
1369 {Opt_err_ro, "errors=remount-ro"},
1370 {Opt_nouid32, "nouid32"},
ac27a0ec 1371 {Opt_debug, "debug"},
72578c33
TT		 1372 {Opt_removed, "oldalloc"},
1373 {Opt_removed, "orlov"},
ac27a0ec
DK		 1374 {Opt_user_xattr, "user_xattr"},
1375 {Opt_nouser_xattr, "nouser_xattr"},
1376 {Opt_acl, "acl"},
1377 {Opt_noacl, "noacl"},
e3bb52ae 1378 {Opt_noload, "norecovery"},
5a916be1 1379 {Opt_noload, "noload"},
72578c33
TT		 1380 {Opt_removed, "nobh"},
1381 {Opt_removed, "bh"},
ac27a0ec 1382 {Opt_commit, "commit=%u"},
30773840
TT		 1383 {Opt_min_batch_time, "min_batch_time=%u"},
1384 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1385 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1386 {Opt_journal_path, "journal_path=%s"},
818d276c 1387 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1388 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1389 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1390 {Opt_abort, "abort"},
1391 {Opt_data_journal, "data=journal"},
1392 {Opt_data_ordered, "data=ordered"},
1393 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1394 {Opt_data_err_abort, "data_err=abort"},
1395 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1396 {Opt_offusrjquota, "usrjquota="},
1397 {Opt_usrjquota, "usrjquota=%s"},
1398 {Opt_offgrpjquota, "grpjquota="},
1399 {Opt_grpjquota, "grpjquota=%s"},
1400 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1401 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1402 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1403 {Opt_grpquota, "grpquota"},
1404 {Opt_noquota, "noquota"},
1405 {Opt_quota, "quota"},
1406 {Opt_usrquota, "usrquota"},
49da9392 1407 {Opt_prjquota, "prjquota"},
ac27a0ec 1408 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1409 {Opt_barrier, "barrier"},
1410 {Opt_nobarrier, "nobarrier"},
25ec56b5 1411 {Opt_i_version, "i_version"},
923ae0ff 1412 {Opt_dax, "dax"},
c9de560d 1413 {Opt_stripe, "stripe=%u"},
64769240 1414 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1415 {Opt_lazytime, "lazytime"},
1416 {Opt_nolazytime, "nolazytime"},
670e9875 1417 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1418 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1419 {Opt_removed, "mblk_io_submit"},
1420 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1421 {Opt_block_validity, "block_validity"},
1422 {Opt_noblock_validity, "noblock_validity"},
240799cd 1423 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1424 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1425 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1426 {Opt_auto_da_alloc, "auto_da_alloc"},
1427 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1428 {Opt_dioread_nolock, "dioread_nolock"},
1429 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1430 {Opt_discard, "discard"},
1431 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1432 {Opt_init_itable, "init_itable=%u"},
1433 {Opt_init_itable, "init_itable"},
1434 {Opt_noinit_itable, "noinit_itable"},
df981d03 1435 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1436 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1437 {Opt_nombcache, "nombcache"},
1438 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
c7198b9c
TT		 1439 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1440 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1441 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1442 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1443 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1444 {Opt_err, NULL},
ac27a0ec
DK		 1445};
1446
617ba13b 1447static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1448{
617ba13b 1449 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1450 char *options = (char *) *data;
1451
1452 if (!options || strncmp(options, "sb=", 3) != 0)
1453 return 1; /* Default location */
0b8e58a1 1454
ac27a0ec 1455 options += 3;
0b8e58a1 1456 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1457 sb_block = simple_strtoul(options, &options, 0);
1458 if (*options && *options != ',') {
4776004f 1459 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1460 (char *) *data);
1461 return 1;
1462 }
1463 if (*options == ',')
1464 options++;
1465 *data = (void *) options;
0b8e58a1 1466
ac27a0ec
DK		 1467 return sb_block;
1468}
1469
b3881f74 1470#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1471static const char deprecated_msg[] =
1472 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1473 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1474
56c50f11
DM		 1475#ifdef CONFIG_QUOTA
1476static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1477{
1478 struct ext4_sb_info *sbi = EXT4_SB(sb);
1479 char *qname;
03dafb5f 1480 int ret = -1;
56c50f11
DM		 1481
1482 if (sb_any_quota_loaded(sb) &&
1483 !sbi->s_qf_names[qtype]) {
1484 ext4_msg(sb, KERN_ERR,
1485 "Cannot change journaled "
1486 "quota options when quota turned on");
57f73c2c 1487 return -1;
56c50f11 1488 }
e2b911c5 1489 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1490 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1491 "ignored when QUOTA feature is enabled");
1492 return 1;
262b4662 1493 }
56c50f11
DM		 1494 qname = match_strdup(args);
1495 if (!qname) {
1496 ext4_msg(sb, KERN_ERR,
1497 "Not enough memory for storing quotafile name");
57f73c2c 1498 return -1;
56c50f11 1499 }
03dafb5f
CG		 1500 if (sbi->s_qf_names[qtype]) {
1501 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1502 ret = 1;
1503 else
1504 ext4_msg(sb, KERN_ERR,
1505 "%s quota file already specified",
1506 QTYPE2NAME(qtype));
1507 goto errout;
56c50f11 1508 }
03dafb5f 1509 if (strchr(qname, '/')) {
56c50f11
DM		 1510 ext4_msg(sb, KERN_ERR,
1511 "quotafile must be on filesystem root");
03dafb5f 1512 goto errout;
56c50f11 1513 }
03dafb5f 1514 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1515 set_opt(sb, QUOTA);
56c50f11 1516 return 1;
03dafb5f
CG		 1517errout:
1518 kfree(qname);
1519 return ret;
56c50f11
DM		 1520}
1521
1522static int clear_qf_name(struct super_block *sb, int qtype)
1523{
1524
1525 struct ext4_sb_info *sbi = EXT4_SB(sb);
1526
1527 if (sb_any_quota_loaded(sb) &&
1528 sbi->s_qf_names[qtype]) {
1529 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1530 " when quota turned on");
57f73c2c 1531 return -1;
56c50f11 1532 }
03dafb5f 1533 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1534 sbi->s_qf_names[qtype] = NULL;
1535 return 1;
1536}
1537#endif
1538
26092bf5
TT		 1539#define MOPT_SET 0x0001
1540#define MOPT_CLEAR 0x0002
1541#define MOPT_NOSUPPORT 0x0004
1542#define MOPT_EXPLICIT 0x0008
1543#define MOPT_CLEAR_ERR 0x0010
1544#define MOPT_GTE0 0x0020
ac27a0ec 1545#ifdef CONFIG_QUOTA
26092bf5
TT		 1546#define MOPT_Q 0
1547#define MOPT_QFMT 0x0040
1548#else
1549#define MOPT_Q MOPT_NOSUPPORT
1550#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1551#endif
26092bf5 1552#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1553#define MOPT_NO_EXT2 0x0100
1554#define MOPT_NO_EXT3 0x0200
1555#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1556#define MOPT_STRING 0x0400
26092bf5
TT		 1557
1558static const struct mount_opts {
1559 int token;
1560 int mount_opt;
1561 int flags;
1562} ext4_mount_opts[] = {
1563 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1564 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1565 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1566 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1567 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1568 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1569 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1570 MOPT_EXT4_ONLY | MOPT_SET},
1571 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1572 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1573 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1574 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1575 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1576 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1577 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1578 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1579 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1580 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1581 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1582 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1583 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1584 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1585 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1586 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1587 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1588 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1589 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1590 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1591 MOPT_NO_EXT2},
8dc0aa8c 1592 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1593 MOPT_NO_EXT2},
26092bf5
TT		 1594 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1595 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1596 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1597 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1598 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1599 {Opt_commit, 0, MOPT_GTE0},
1600 {Opt_max_batch_time, 0, MOPT_GTE0},
1601 {Opt_min_batch_time, 0, MOPT_GTE0},
1602 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1603 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1604 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1605 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1606 {Opt_resuid, 0, MOPT_GTE0},
1607 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1608 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1609 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1610 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1611 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1612 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1613 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1614 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1615 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1616 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1617#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1618 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1619 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1620#else
26092bf5
TT		 1621 {Opt_acl, 0, MOPT_NOSUPPORT},
1622 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1623#endif
26092bf5
TT		 1624 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1625 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1626 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1627 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1628 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1629 MOPT_SET | MOPT_Q},
1630 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1631 MOPT_SET | MOPT_Q},
49da9392
JK		 1632 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1633 MOPT_SET | MOPT_Q},
26092bf5 1634 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1635 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1636 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1637 {Opt_usrjquota, 0, MOPT_Q},
1638 {Opt_grpjquota, 0, MOPT_Q},
1639 {Opt_offusrjquota, 0, MOPT_Q},
1640 {Opt_offgrpjquota, 0, MOPT_Q},
1641 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1642 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1643 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1644 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1645 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
cdb7ee4c 1646 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
26092bf5
TT		 1647 {Opt_err, 0, 0}
1648};
1649
1650static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1651 substring_t *args, unsigned long *journal_devnum,
1652 unsigned int *journal_ioprio, int is_remount)
1653{
1654 struct ext4_sb_info *sbi = EXT4_SB(sb);
1655 const struct mount_opts *m;
08cefc7a
EB		 1656 kuid_t uid;
1657 kgid_t gid;
26092bf5
TT		 1658 int arg = 0;
1659
57f73c2c
TT		 1660#ifdef CONFIG_QUOTA
1661 if (token == Opt_usrjquota)
1662 return set_qf_name(sb, USRQUOTA, &args[0]);
1663 else if (token == Opt_grpjquota)
1664 return set_qf_name(sb, GRPQUOTA, &args[0]);
1665 else if (token == Opt_offusrjquota)
1666 return clear_qf_name(sb, USRQUOTA);
1667 else if (token == Opt_offgrpjquota)
1668 return clear_qf_name(sb, GRPQUOTA);
1669#endif
26092bf5 1670 switch (token) {
f7048605
TT		 1671 case Opt_noacl:
1672 case Opt_nouser_xattr:
1673 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1674 break;
26092bf5
TT		 1675 case Opt_sb:
1676 return 1; /* handled by get_sb_block() */
1677 case Opt_removed:
5f3633e3 1678 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1679 return 1;
26092bf5
TT		 1680 case Opt_abort:
1681 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1682 return 1;
1683 case Opt_i_version:
357fdad0 1684 sb->s_flags |= SB_I_VERSION;
26092bf5 1685 return 1;
a26f4992 1686 case Opt_lazytime:
1751e8a6 1687 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1688 return 1;
1689 case Opt_nolazytime:
1751e8a6 1690 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1691 return 1;
26092bf5
TT		 1692 }
1693
5f3633e3
JK		 1694 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1695 if (token == m->token)
1696 break;
1697
1698 if (m->token == Opt_err) {
1699 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1700 "or missing value", opt);
1701 return -1;
1702 }
1703
8dc0aa8c
TT		 1704 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1705 ext4_msg(sb, KERN_ERR,
1706 "Mount option \"%s\" incompatible with ext2", opt);
1707 return -1;
1708 }
1709 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1710 ext4_msg(sb, KERN_ERR,
1711 "Mount option \"%s\" incompatible with ext3", opt);
1712 return -1;
1713 }
1714
ad4eec61 1715 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1716 return -1;
1717 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1718 return -1;
c93cf2d7
DM		 1719 if (m->flags & MOPT_EXPLICIT) {
1720 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1721 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1722 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1723 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1724 } else
1725 return -1;
1726 }
5f3633e3
JK		 1727 if (m->flags & MOPT_CLEAR_ERR)
1728 clear_opt(sb, ERRORS_MASK);
1729 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1730 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1731 "options when quota turned on");
1732 return -1;
1733 }
1734
1735 if (m->flags & MOPT_NOSUPPORT) {
1736 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1737 } else if (token == Opt_commit) {
1738 if (arg == 0)
1739 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1740 sbi->s_commit_interval = HZ * arg;
670e9875
TT		 1741 } else if (token == Opt_debug_want_extra_isize) {
1742 sbi->s_want_extra_isize = arg;
5f3633e3 1743 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1744 sbi->s_max_batch_time = arg;
1745 } else if (token == Opt_min_batch_time) {
1746 sbi->s_min_batch_time = arg;
1747 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1748 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1749 ext4_msg(sb, KERN_ERR,
1750 "EXT4-fs: inode_readahead_blks must be "
1751 "0 or a power of 2 smaller than 2^31");
26092bf5 1752 return -1;
5f3633e3
JK		 1753 }
1754 sbi->s_inode_readahead_blks = arg;
1755 } else if (token == Opt_init_itable) {
1756 set_opt(sb, INIT_INODE_TABLE);
1757 if (!args->from)
1758 arg = EXT4_DEF_LI_WAIT_MULT;
1759 sbi->s_li_wait_mult = arg;
1760 } else if (token == Opt_max_dir_size_kb) {
1761 sbi->s_max_dir_size_kb = arg;
1762 } else if (token == Opt_stripe) {
1763 sbi->s_stripe = arg;
1764 } else if (token == Opt_resuid) {
1765 uid = make_kuid(current_user_ns(), arg);
1766 if (!uid_valid(uid)) {
1767 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1768 return -1;
1769 }
5f3633e3
JK		 1770 sbi->s_resuid = uid;
1771 } else if (token == Opt_resgid) {
1772 gid = make_kgid(current_user_ns(), arg);
1773 if (!gid_valid(gid)) {
1774 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1775 return -1;
1776 }
1777 sbi->s_resgid = gid;
1778 } else if (token == Opt_journal_dev) {
1779 if (is_remount) {
1780 ext4_msg(sb, KERN_ERR,
1781 "Cannot specify journal on remount");
1782 return -1;
1783 }
1784 *journal_devnum = arg;
ad4eec61
ES		 1785 } else if (token == Opt_journal_path) {
1786 char *journal_path;
1787 struct inode *journal_inode;
1788 struct path path;
1789 int error;
1790
1791 if (is_remount) {
1792 ext4_msg(sb, KERN_ERR,
1793 "Cannot specify journal on remount");
1794 return -1;
1795 }
1796 journal_path = match_strdup(&args[0]);
1797 if (!journal_path) {
1798 ext4_msg(sb, KERN_ERR, "error: could not dup "
1799 "journal device string");
1800 return -1;
1801 }
1802
1803 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1804 if (error) {
1805 ext4_msg(sb, KERN_ERR, "error: could not find "
1806 "journal device path: error %d", error);
1807 kfree(journal_path);
1808 return -1;
1809 }
1810
2b0143b5 1811 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1812 if (!S_ISBLK(journal_inode->i_mode)) {
1813 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1814 "is not a block device", journal_path);
1815 path_put(&path);
1816 kfree(journal_path);
1817 return -1;
1818 }
1819
1820 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1821 path_put(&path);
1822 kfree(journal_path);
5f3633e3
JK		 1823 } else if (token == Opt_journal_ioprio) {
1824 if (arg > 7) {
1825 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1826 " (must be 0-7)");
1827 return -1;
1828 }
1829 *journal_ioprio =
1830 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1831 } else if (token == Opt_test_dummy_encryption) {
1832#ifdef CONFIG_EXT4_FS_ENCRYPTION
1833 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1834 ext4_msg(sb, KERN_WARNING,
1835 "Test dummy encryption mode enabled");
1836#else
1837 ext4_msg(sb, KERN_WARNING,
1838 "Test dummy encryption mount option ignored");
1839#endif
5f3633e3
JK		 1840 } else if (m->flags & MOPT_DATAJ) {
1841 if (is_remount) {
1842 if (!sbi->s_journal)
1843 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1844 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1845 ext4_msg(sb, KERN_ERR,
26092bf5 1846 "Cannot change data mode on remount");
26092bf5 1847 return -1;
ac27a0ec 1848 }
26092bf5 1849 } else {
5f3633e3
JK		 1850 clear_opt(sb, DATA_FLAGS);
1851 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1852 }
5f3633e3
JK		 1853#ifdef CONFIG_QUOTA
1854 } else if (m->flags & MOPT_QFMT) {
1855 if (sb_any_quota_loaded(sb) &&
1856 sbi->s_jquota_fmt != m->mount_opt) {
1857 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1858 "quota options when quota turned on");
1859 return -1;
1860 }
e2b911c5 1861 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1862 ext4_msg(sb, KERN_INFO,
1863 "Quota format mount options ignored "
262b4662 1864 "when QUOTA feature is enabled");
c325a67c 1865 return 1;
262b4662 1866 }
5f3633e3 1867 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1868#endif
923ae0ff 1869 } else if (token == Opt_dax) {
ef83b6e8
DW		 1870#ifdef CONFIG_FS_DAX
1871 ext4_msg(sb, KERN_WARNING,
1872 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1873 sbi->s_mount_opt |= m->mount_opt;
1874#else
923ae0ff
RZ		 1875 ext4_msg(sb, KERN_INFO, "dax option not supported");
1876 return -1;
5f3633e3 1877#endif
7915a861
AN		 1878 } else if (token == Opt_data_err_abort) {
1879 sbi->s_mount_opt |= m->mount_opt;
1880 } else if (token == Opt_data_err_ignore) {
1881 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1882 } else {
1883 if (!args->from)
1884 arg = 1;
1885 if (m->flags & MOPT_CLEAR)
1886 arg = !arg;
1887 else if (unlikely(!(m->flags & MOPT_SET))) {
1888 ext4_msg(sb, KERN_WARNING,
1889 "buggy handling of option %s", opt);
1890 WARN_ON(1);
1891 return -1;
1892 }
1893 if (arg != 0)
1894 sbi->s_mount_opt |= m->mount_opt;
1895 else
1896 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1897 }
5f3633e3 1898 return 1;
26092bf5
TT		 1899}
1900
1901static int parse_options(char *options, struct super_block *sb,
1902 unsigned long *journal_devnum,
1903 unsigned int *journal_ioprio,
1904 int is_remount)
1905{
1906 struct ext4_sb_info *sbi = EXT4_SB(sb);
1907 char *p;
1908 substring_t args[MAX_OPT_ARGS];
1909 int token;
1910
1911 if (!options)
1912 return 1;
1913
1914 while ((p = strsep(&options, ",")) != NULL) {
1915 if (!*p)
1916 continue;
1917 /*
1918 * Initialize args struct so we know whether arg was
1919 * found; some options take optional arguments.
1920 */
caecd0af 1921 args[0].to = args[0].from = NULL;
26092bf5
TT		 1922 token = match_token(p, tokens, args);
1923 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1924 journal_ioprio, is_remount) < 0)
1925 return 0;
ac27a0ec
DK		 1926 }
1927#ifdef CONFIG_QUOTA
49da9392
JK		 1928 /*
1929 * We do the test below only for project quotas. 'usrquota' and
1930 * 'grpquota' mount options are allowed even without quota feature
1931 * to support legacy quotas in quota files.
1932 */
1933 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1934 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1935 "Cannot enable project quota enforcement.");
1936 return 0;
1937 }
1938 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1939 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1940 clear_opt(sb, USRQUOTA);
ac27a0ec 1941
482a7425 1942 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1943 clear_opt(sb, GRPQUOTA);
ac27a0ec 1944
56c50f11 1945 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1946 ext4_msg(sb, KERN_ERR, "old and new quota "
1947 "format mixing");
ac27a0ec
DK		 1948 return 0;
1949 }
1950
1951 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1952 ext4_msg(sb, KERN_ERR, "journaled quota format "
1953 "not specified");
ac27a0ec
DK		 1954 return 0;
1955 }
ac27a0ec
DK		 1956 }
1957#endif
261cb20c
JK		 1958 if (test_opt(sb, DIOREAD_NOLOCK)) {
1959 int blocksize =
1960 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1961
09cbfeaf 1962 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 1963 ext4_msg(sb, KERN_ERR, "can't mount with "
1964 "dioread_nolock if block size != PAGE_SIZE");
1965 return 0;
1966 }
1967 }
ac27a0ec
DK		 1968 return 1;
1969}
1970
2adf6da8
TT		 1971static inline void ext4_show_quota_options(struct seq_file *seq,
1972 struct super_block *sb)
1973{
1974#if defined(CONFIG_QUOTA)
1975 struct ext4_sb_info *sbi = EXT4_SB(sb);
1976
1977 if (sbi->s_jquota_fmt) {
1978 char *fmtname = "";
1979
1980 switch (sbi->s_jquota_fmt) {
1981 case QFMT_VFS_OLD:
1982 fmtname = "vfsold";
1983 break;
1984 case QFMT_VFS_V0:
1985 fmtname = "vfsv0";
1986 break;
1987 case QFMT_VFS_V1:
1988 fmtname = "vfsv1";
1989 break;
1990 }
1991 seq_printf(seq, ",jqfmt=%s", fmtname);
1992 }
1993
1994 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1995 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1996
1997 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1998 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1999#endif
2000}
2001
5a916be1
TT		 2002static const char *token2str(int token)
2003{
50df9fd5 2004 const struct match_token *t;
5a916be1
TT		 2005
2006 for (t = tokens; t->token != Opt_err; t++)
2007 if (t->token == token && !strchr(t->pattern, '='))
2008 break;
2009 return t->pattern;
2010}
2011
2adf6da8
TT		 2012/*
2013 * Show an option if
2014 * - it's set to a non-default value OR
2015 * - if the per-sb default is different from the global default
2016 */
66acdcf4
TT		 2017static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2018 int nodefs)
2adf6da8 2019{
2adf6da8
TT		 2020 struct ext4_sb_info *sbi = EXT4_SB(sb);
2021 struct ext4_super_block *es = sbi->s_es;
66acdcf4 2022 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 2023 const struct mount_opts *m;
66acdcf4 2024 char sep = nodefs ? '\n' : ',';
2adf6da8 2025
66acdcf4
TT		 2026#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2027#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2028
2029 if (sbi->s_sb_block != 1)
5a916be1
TT		 2030 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2031
2032 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2033 int want_set = m->flags & MOPT_SET;
2034 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2035 (m->flags & MOPT_CLEAR_ERR))
2036 continue;
66acdcf4 2037 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2038 continue; /* skip if same as the default */
2039 if ((want_set &&
2040 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2041 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2042 continue; /* select Opt_noFoo vs Opt_Foo */
2043 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2044 }
5a916be1 2045
08cefc7a 2046 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2047 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2048 SEQ_OPTS_PRINT("resuid=%u",
2049 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2050 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2051 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2052 SEQ_OPTS_PRINT("resgid=%u",
2053 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2054 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2055 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2056 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2057 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2058 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2059 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2060 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2061 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2062 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2063 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2064 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2065 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2066 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2067 if (sb->s_flags & SB_I_VERSION)
5a916be1 2068 SEQ_OPTS_PUTS("i_version");
66acdcf4 2069 if (nodefs || sbi->s_stripe)
5a916be1 2070 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 2071 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2072 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2073 SEQ_OPTS_PUTS("data=journal");
2074 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2075 SEQ_OPTS_PUTS("data=ordered");
2076 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2077 SEQ_OPTS_PUTS("data=writeback");
2078 }
66acdcf4
TT		 2079 if (nodefs ||
2080 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2081 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2082 sbi->s_inode_readahead_blks);
2adf6da8 2083
66acdcf4
TT		 2084 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
2085 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2086 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2087 if (nodefs || sbi->s_max_dir_size_kb)
2088 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2089 if (test_opt(sb, DATA_ERR_ABORT))
2090 SEQ_OPTS_PUTS("data_err=abort");
2adf6da8
TT		 2091
2092 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2093 return 0;
2094}
2095
66acdcf4
TT		 2096static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2097{
2098 return _ext4_show_options(seq, root->d_sb, 0);
2099}
2100
ebd173be 2101int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2102{
2103 struct super_block *sb = seq->private;
2104 int rc;
2105
bc98a42c 2106 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2107 rc = _ext4_show_options(seq, sb, 1);
2108 seq_puts(seq, "\n");
2109 return rc;
2110}
2111
617ba13b 2112static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2113 int read_only)
2114{
617ba13b 2115 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2116 int res = 0;
2117
617ba13b 2118 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2119 ext4_msg(sb, KERN_ERR, "revision level too high, "
2120 "forcing read-only mode");
1751e8a6 2121 res = SB_RDONLY;
ac27a0ec
DK		 2122 }
2123 if (read_only)
281b5995 2124 goto done;
617ba13b 2125 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2126 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2127 "running e2fsck is recommended");
c8b459f4 2128 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2129 ext4_msg(sb, KERN_WARNING,
2130 "warning: mounting fs with errors, "
2131 "running e2fsck is recommended");
ed3ce80a 2132 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2133 le16_to_cpu(es->s_mnt_count) >=
2134 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2135 ext4_msg(sb, KERN_WARNING,
2136 "warning: maximal mount count reached, "
2137 "running e2fsck is recommended");
ac27a0ec
DK		 2138 else if (le32_to_cpu(es->s_checkinterval) &&
2139 (le32_to_cpu(es->s_lastcheck) +
2140 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 2141 ext4_msg(sb, KERN_WARNING,
2142 "warning: checktime reached, "
2143 "running e2fsck is recommended");
0b8e58a1 2144 if (!sbi->s_journal)
0390131b 2145 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2146 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2147 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2148 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 2149 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 2150 ext4_update_dynamic_rev(sb);
0390131b 2151 if (sbi->s_journal)
e2b911c5 2152 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2153
e2d67052 2154 ext4_commit_super(sb, 1);
281b5995 2155done:
ac27a0ec 2156 if (test_opt(sb, DEBUG))
a9df9a49 2157 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2158 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2159 sb->s_blocksize,
2160 sbi->s_groups_count,
617ba13b
MC		 2161 EXT4_BLOCKS_PER_GROUP(sb),
2162 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2163 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2164
7abc52c2 2165 cleancache_init_fs(sb);
ac27a0ec
DK		 2166 return res;
2167}
2168
117fff10
TT		 2169int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2170{
2171 struct ext4_sb_info *sbi = EXT4_SB(sb);
2172 struct flex_groups *new_groups;
2173 int size;
2174
2175 if (!sbi->s_log_groups_per_flex)
2176 return 0;
2177
2178 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2179 if (size <= sbi->s_flex_groups_allocated)
2180 return 0;
2181
2182 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
a7c3e901 2183 new_groups = kvzalloc(size, GFP_KERNEL);
117fff10
TT		 2184 if (!new_groups) {
2185 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2186 size / (int) sizeof(struct flex_groups));
2187 return -ENOMEM;
2188 }
2189
2190 if (sbi->s_flex_groups) {
2191 memcpy(new_groups, sbi->s_flex_groups,
2192 (sbi->s_flex_groups_allocated *
2193 sizeof(struct flex_groups)));
b93b41d4 2194 kvfree(sbi->s_flex_groups);
117fff10
TT		 2195 }
2196 sbi->s_flex_groups = new_groups;
2197 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2198 return 0;
2199}
2200
772cb7c8
JS		 2201static int ext4_fill_flex_info(struct super_block *sb)
2202{
2203 struct ext4_sb_info *sbi = EXT4_SB(sb);
2204 struct ext4_group_desc *gdp = NULL;
772cb7c8 2205 ext4_group_t flex_group;
117fff10 2206 int i, err;
772cb7c8 2207
503358ae 2208 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2209 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2210 sbi->s_log_groups_per_flex = 0;
2211 return 1;
2212 }
2213
117fff10
TT		 2214 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2215 if (err)
9933fc0a 2216 goto failed;
772cb7c8 2217
772cb7c8 2218 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2219 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2220
2221 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2222 atomic_add(ext4_free_inodes_count(sb, gdp),
2223 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2224 atomic64_add(ext4_free_group_clusters(sb, gdp),
2225 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2226 atomic_add(ext4_used_dirs_count(sb, gdp),
2227 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2228 }
2229
2230 return 1;
2231failed:
2232 return 0;
2233}
2234
e2b911c5 2235static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2236 struct ext4_group_desc *gdp)
717d50e4 2237{
b47820ed 2238 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2239 __u16 crc = 0;
feb0ab32 2240 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2241 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2242
9aa5d32b 2243 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2244 /* Use new metadata_csum algorithm */
feb0ab32 2245 __u32 csum32;
b47820ed 2246 __u16 dummy_csum = 0;
feb0ab32 2247
feb0ab32
DW		 2248 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2249 sizeof(le_group));
b47820ed
DJ		 2250 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2251 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2252 sizeof(dummy_csum));
2253 offset += sizeof(dummy_csum);
2254 if (offset < sbi->s_desc_size)
2255 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2256 sbi->s_desc_size - offset);
feb0ab32
DW		 2257
2258 crc = csum32 & 0xFFFF;
2259 goto out;
717d50e4
AD		 2260 }
2261
feb0ab32 2262 /* old crc16 code */
e2b911c5 2263 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2264 return 0;
2265
feb0ab32
DW		 2266 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2267 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2268 crc = crc16(crc, (__u8 *)gdp, offset);
2269 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2270 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2271 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2272 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2273 crc = crc16(crc, (__u8 *)gdp + offset,
2274 le16_to_cpu(sbi->s_es->s_desc_size) -
2275 offset);
2276
2277out:
717d50e4
AD		 2278 return cpu_to_le16(crc);
2279}
2280
feb0ab32 2281int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2282 struct ext4_group_desc *gdp)
2283{
feb0ab32 2284 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2285 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2286 return 0;
2287
2288 return 1;
2289}
2290
feb0ab32
DW		 2291void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2292 struct ext4_group_desc *gdp)
2293{
2294 if (!ext4_has_group_desc_csum(sb))
2295 return;
e2b911c5 2296 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2297}
2298
ac27a0ec 2299/* Called at mount-time, super-block is locked */
bfff6873 2300static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2301 ext4_fsblk_t sb_block,
bfff6873 2302 ext4_group_t *first_not_zeroed)
ac27a0ec 2303{
617ba13b
MC		 2304 struct ext4_sb_info *sbi = EXT4_SB(sb);
2305 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2306 ext4_fsblk_t last_block;
bd81d8ee
LV		 2307 ext4_fsblk_t block_bitmap;
2308 ext4_fsblk_t inode_bitmap;
2309 ext4_fsblk_t inode_table;
ce421581 2310 int flexbg_flag = 0;
bfff6873 2311 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2312
e2b911c5 2313 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2314 flexbg_flag = 1;
2315
af5bc92d 2316 ext4_debug("Checking group descriptors");
ac27a0ec 2317
197cd65a
AM		 2318 for (i = 0; i < sbi->s_groups_count; i++) {
2319 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2320
ce421581 2321 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2322 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2323 else
2324 last_block = first_block +
617ba13b 2325 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2326
bfff6873
LC		 2327 if ((grp == sbi->s_groups_count) &&
2328 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2329 grp = i;
2330
8fadc143 2331 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2332 if (block_bitmap == sb_block) {
2333 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2334 "Block bitmap for group %u overlaps "
2335 "superblock", i);
2336 }
2b2d6d01 2337 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2338 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2339 "Block bitmap for group %u not in group "
b31e1552 2340 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2341 return 0;
2342 }
8fadc143 2343 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2344 if (inode_bitmap == sb_block) {
2345 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2346 "Inode bitmap for group %u overlaps "
2347 "superblock", i);
2348 }
2b2d6d01 2349 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2350 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2351 "Inode bitmap for group %u not in group "
b31e1552 2352 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2353 return 0;
2354 }
8fadc143 2355 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2356 if (inode_table == sb_block) {
2357 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2358 "Inode table for group %u overlaps "
2359 "superblock", i);
2360 }
bd81d8ee 2361 if (inode_table < first_block ||
2b2d6d01 2362 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2363 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2364 "Inode table for group %u not in group "
b31e1552 2365 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2366 return 0;
2367 }
955ce5f5 2368 ext4_lock_group(sb, i);
feb0ab32 2369 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2370 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2371 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2372 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2373 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2374 if (!sb_rdonly(sb)) {
955ce5f5 2375 ext4_unlock_group(sb, i);
8a266467 2376 return 0;
7ee1ec4c 2377 }
717d50e4 2378 }
955ce5f5 2379 ext4_unlock_group(sb, i);
ce421581
JS		 2380 if (!flexbg_flag)
2381 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2382 }
bfff6873
LC		 2383 if (NULL != first_not_zeroed)
2384 *first_not_zeroed = grp;
ac27a0ec
DK		 2385 return 1;
2386}
2387
617ba13b 2388/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2389 * the superblock) which were deleted from all directories, but held open by
2390 * a process at the time of a crash. We walk the list and try to delete these
2391 * inodes at recovery time (only with a read-write filesystem).
2392 *
2393 * In order to keep the orphan inode chain consistent during traversal (in
2394 * case of crash during recovery), we link each inode into the superblock
2395 * orphan list_head and handle it the same way as an inode deletion during
2396 * normal operation (which journals the operations for us).
2397 *
2398 * We only do an iget() and an iput() on each inode, which is very safe if we
2399 * accidentally point at an in-use or already deleted inode. The worst that
2400 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2401 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2402 * e2fsck was run on this filesystem, and it must have already done the orphan
2403 * inode cleanup for us, so we can safely abort without any further action.
2404 */
2b2d6d01
TT		 2405static void ext4_orphan_cleanup(struct super_block *sb,
2406 struct ext4_super_block *es)
ac27a0ec
DK		 2407{
2408 unsigned int s_flags = sb->s_flags;
2c98eb5e 2409 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2410#ifdef CONFIG_QUOTA
95f1fda4 2411 int quota_update = 0;
ac27a0ec
DK		 2412 int i;
2413#endif
2414 if (!es->s_last_orphan) {
2415 jbd_debug(4, "no orphan inodes to clean up\n");
2416 return;
2417 }
2418
a8f48a95 2419 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2420 ext4_msg(sb, KERN_ERR, "write access "
2421 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2422 return;
2423 }
2424
d39195c3
AG		 2425 /* Check if feature set would not allow a r/w mount */
2426 if (!ext4_feature_set_ok(sb, 0)) {
2427 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2428 "unknown ROCOMPAT features");
2429 return;
2430 }
2431
617ba13b 2432 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2433 /* don't clear list on RO mount w/ errors */
1751e8a6 2434 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2435 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2436 "clearing orphan list.\n");
c25f9bc6
ES		 2437 es->s_last_orphan = 0;
2438 }
ac27a0ec
DK		 2439 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2440 return;
2441 }
2442
1751e8a6 2443 if (s_flags & SB_RDONLY) {
b31e1552 2444 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2445 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2446 }
2447#ifdef CONFIG_QUOTA
2448 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2449 sb->s_flags |= SB_ACTIVE;
95f1fda4 2450
2451 /*
2452 * Turn on quotas which were not enabled for read-only mounts if
2453 * filesystem has quota feature, so that they are updated correctly.
2454 */
1751e8a6 2455 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2456 int ret = ext4_enable_quotas(sb);
2457
2458 if (!ret)
2459 quota_update = 1;
2460 else
2461 ext4_msg(sb, KERN_ERR,
2462 "Cannot turn on quotas: error %d", ret);
2463 }
2464
2465 /* Turn on journaled quotas used for old sytle */
a2d4a646 2466 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2467 if (EXT4_SB(sb)->s_qf_names[i]) {
2468 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2469
2470 if (!ret)
2471 quota_update = 1;
2472 else
b31e1552
ES		 2473 ext4_msg(sb, KERN_ERR,
2474 "Cannot turn on journaled "
95f1fda4 2475 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2476 }
2477 }
2478#endif
2479
2480 while (es->s_last_orphan) {
2481 struct inode *inode;
2482
c65d5c6c
VN		 2483 /*
2484 * We may have encountered an error during cleanup; if
2485 * so, skip the rest.
2486 */
2487 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2488 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2489 es->s_last_orphan = 0;
2490 break;
2491 }
2492
97bd42b9
JB		 2493 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2494 if (IS_ERR(inode)) {
ac27a0ec
DK		 2495 es->s_last_orphan = 0;
2496 break;
2497 }
2498
617ba13b 2499 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2500 dquot_initialize(inode);
ac27a0ec 2501 if (inode->i_nlink) {
566370a2
PT		 2502 if (test_opt(sb, DEBUG))
2503 ext4_msg(sb, KERN_DEBUG,
2504 "%s: truncating inode %lu to %lld bytes",
2505 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2506 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2507 inode->i_ino, inode->i_size);
5955102c 2508 inode_lock(inode);
55f252c9 2509 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2510 ret = ext4_truncate(inode);
2511 if (ret)
2512 ext4_std_error(inode->i_sb, ret);
5955102c 2513 inode_unlock(inode);
ac27a0ec
DK		 2514 nr_truncates++;
2515 } else {
566370a2
PT		 2516 if (test_opt(sb, DEBUG))
2517 ext4_msg(sb, KERN_DEBUG,
2518 "%s: deleting unreferenced inode %lu",
2519 __func__, inode->i_ino);
ac27a0ec
DK		 2520 jbd_debug(2, "deleting unreferenced inode %lu\n",
2521 inode->i_ino);
2522 nr_orphans++;
2523 }
2524 iput(inode); /* The delete magic happens here! */
2525 }
2526
2b2d6d01 2527#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2528
2529 if (nr_orphans)
b31e1552
ES		 2530 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2531 PLURAL(nr_orphans));
ac27a0ec 2532 if (nr_truncates)
b31e1552
ES		 2533 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2534 PLURAL(nr_truncates));
ac27a0ec 2535#ifdef CONFIG_QUOTA
95f1fda4 2536 /* Turn off quotas if they were enabled for orphan cleanup */
2537 if (quota_update) {
2538 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2539 if (sb_dqopt(sb)->files[i])
2540 dquot_quota_off(sb, i);
2541 }
ac27a0ec
DK		 2542 }
2543#endif
1751e8a6 2544 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2545}
0b8e58a1 2546
cd2291a4
ES		 2547/*
2548 * Maximal extent format file size.
2549 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2550 * extent format containers, within a sector_t, and within i_blocks
2551 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2552 * so that won't be a limiting factor.
2553 *
f17722f9
LC		 2554 * However there is other limiting factor. We do store extents in the form
2555 * of starting block and length, hence the resulting length of the extent
2556 * covering maximum file size must fit into on-disk format containers as
2557 * well. Given that length is always by 1 unit bigger than max unit (because
2558 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2559 *
cd2291a4
ES		 2560 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2561 */
f287a1a5 2562static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2563{
2564 loff_t res;
2565 loff_t upper_limit = MAX_LFS_FILESIZE;
2566
2567 /* small i_blocks in vfs inode? */
f287a1a5 2568 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2569 /*
90c699a9 2570 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2571 * i_block represent total blocks in 512 bytes
2572 * 32 == size of vfs inode i_blocks * 8
2573 */
2574 upper_limit = (1LL << 32) - 1;
2575
2576 /* total blocks in file system block size */
2577 upper_limit >>= (blkbits - 9);
2578 upper_limit <<= blkbits;
2579 }
2580
f17722f9
LC		 2581 /*
2582 * 32-bit extent-start container, ee_block. We lower the maxbytes
2583 * by one fs block, so ee_len can cover the extent of maximum file
2584 * size
2585 */
2586 res = (1LL << 32) - 1;
cd2291a4 2587 res <<= blkbits;
cd2291a4
ES		 2588
2589 /* Sanity check against vm- & vfs- imposed limits */
2590 if (res > upper_limit)
2591 res = upper_limit;
2592
2593 return res;
2594}
ac27a0ec 2595
ac27a0ec 2596/*
cd2291a4 2597 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2598 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2599 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2600 */
f287a1a5 2601static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2602{
617ba13b 2603 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2604 int meta_blocks;
2605 loff_t upper_limit;
0b8e58a1
AD		 2606 /* This is calculated to be the largest file size for a dense, block
2607 * mapped file such that the file's total number of 512-byte sectors,
2608 * including data and all indirect blocks, does not exceed (2^48 - 1).
2609 *
2610 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2611 * number of 512-byte sectors of the file.
0fc1b451
AK		 2612 */
2613
f287a1a5 2614 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2615 /*
90c699a9 2616 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2617 * the inode i_block field represents total file blocks in
2618 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2619 */
2620 upper_limit = (1LL << 32) - 1;
2621
2622 /* total blocks in file system block size */
2623 upper_limit >>= (bits - 9);
2624
2625 } else {
8180a562
AK		 2626 /*
2627 * We use 48 bit ext4_inode i_blocks
2628 * With EXT4_HUGE_FILE_FL set the i_blocks
2629 * represent total number of blocks in
2630 * file system block size
2631 */
0fc1b451
AK		 2632 upper_limit = (1LL << 48) - 1;
2633
0fc1b451
AK		 2634 }
2635
2636 /* indirect blocks */
2637 meta_blocks = 1;
2638 /* double indirect blocks */
2639 meta_blocks += 1 + (1LL << (bits-2));
2640 /* tripple indirect blocks */
2641 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2642
2643 upper_limit -= meta_blocks;
2644 upper_limit <<= bits;
ac27a0ec
DK		 2645
2646 res += 1LL << (bits-2);
2647 res += 1LL << (2*(bits-2));
2648 res += 1LL << (3*(bits-2));
2649 res <<= bits;
2650 if (res > upper_limit)
2651 res = upper_limit;
0fc1b451
AK		 2652
2653 if (res > MAX_LFS_FILESIZE)
2654 res = MAX_LFS_FILESIZE;
2655
ac27a0ec
DK		 2656 return res;
2657}
2658
617ba13b 2659static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2660 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2661{
617ba13b 2662 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2663 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2664 int has_super = 0;
2665
2666 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2667
e2b911c5 2668 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2669 return logical_sb_block + nr + 1;
ac27a0ec 2670 bg = sbi->s_desc_per_block * nr;
617ba13b 2671 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2672 has_super = 1;
0b8e58a1 2673
bd63f6b0
DW		 2674 /*
2675 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2676 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2677 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2678 * compensate.
2679 */
2680 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 2681 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 2682 has_super++;
2683
617ba13b 2684 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2685}
2686
c9de560d
AT		 2687/**
2688 * ext4_get_stripe_size: Get the stripe size.
2689 * @sbi: In memory super block info
2690 *
2691 * If we have specified it via mount option, then
2692 * use the mount option value. If the value specified at mount time is
2693 * greater than the blocks per group use the super block value.
2694 * If the super block value is greater than blocks per group return 0.
2695 * Allocator needs it be less than blocks per group.
2696 *
2697 */
2698static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2699{
2700 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2701 unsigned long stripe_width =
2702 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2703 int ret;
c9de560d
AT		 2704
2705 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2706 ret = sbi->s_stripe;
5469d7c3 2707 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2708 ret = stripe_width;
5469d7c3 2709 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2710 ret = stride;
2711 else
2712 ret = 0;
c9de560d 2713
3eb08658
DE		 2714 /*
2715 * If the stripe width is 1, this makes no sense and
2716 * we set it to 0 to turn off stripe handling code.
2717 */
2718 if (ret <= 1)
2719 ret = 0;
c9de560d 2720
3eb08658 2721 return ret;
c9de560d 2722}
ac27a0ec 2723
a13fb1a4
ES		 2724/*
2725 * Check whether this filesystem can be mounted based on
2726 * the features present and the RDONLY/RDWR mount requested.
2727 * Returns 1 if this filesystem can be mounted as requested,
2728 * 0 if it cannot be.
2729 */
2730static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2731{
e2b911c5 2732 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2733 ext4_msg(sb, KERN_ERR,
2734 "Couldn't mount because of "
2735 "unsupported optional features (%x)",
2736 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2737 ~EXT4_FEATURE_INCOMPAT_SUPP));
2738 return 0;
2739 }
2740
2741 if (readonly)
2742 return 1;
2743
e2b911c5 2744 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 2745 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 2746 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 2747 return 1;
2748 }
2749
a13fb1a4 2750 /* Check that feature set is OK for a read-write mount */
e2b911c5 2751 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2752 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2753 "unsupported optional features (%x)",
2754 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2755 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2756 return 0;
2757 }
2758 /*
2759 * Large file size enabled file system can only be mounted
2760 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2761 */
e2b911c5 2762 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2763 if (sizeof(blkcnt_t) < sizeof(u64)) {
2764 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2765 "cannot be mounted RDWR without "
2766 "CONFIG_LBDAF");
2767 return 0;
2768 }
2769 }
e2b911c5 2770 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2771 ext4_msg(sb, KERN_ERR,
2772 "Can't support bigalloc feature without "
2773 "extents feature\n");
2774 return 0;
2775 }
7c319d32
AK		 2776
2777#ifndef CONFIG_QUOTA
e2b911c5 2778 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2779 ext4_msg(sb, KERN_ERR,
2780 "Filesystem with quota feature cannot be mounted RDWR "
2781 "without CONFIG_QUOTA");
2782 return 0;
2783 }
689c958c
LX		 2784 if (ext4_has_feature_project(sb) && !readonly) {
2785 ext4_msg(sb, KERN_ERR,
2786 "Filesystem with project quota feature cannot be mounted RDWR "
2787 "without CONFIG_QUOTA");
2788 return 0;
2789 }
7c319d32 2790#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2791 return 1;
2792}
2793
66e61a9e
TT		 2794/*
2795 * This function is called once a day if we have errors logged
2796 * on the file system
2797 */
235699a8 2798static void print_daily_error_info(struct timer_list *t)
66e61a9e 2799{
235699a8
KC		 2800 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2801 struct super_block *sb = sbi->s_sb;
2802 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 2803
2804 if (es->s_error_count)
ae0f78de
TT		 2805 /* fsck newer than v1.41.13 is needed to clean this condition. */
2806 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2807 le32_to_cpu(es->s_error_count));
2808 if (es->s_first_error_time) {
ae0f78de 2809 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2810 sb->s_id, le32_to_cpu(es->s_first_error_time),
2811 (int) sizeof(es->s_first_error_func),
2812 es->s_first_error_func,
2813 le32_to_cpu(es->s_first_error_line));
2814 if (es->s_first_error_ino)
651e1c3b 2815 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2816 le32_to_cpu(es->s_first_error_ino));
2817 if (es->s_first_error_block)
651e1c3b 2818 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2819 le64_to_cpu(es->s_first_error_block));
651e1c3b 2820 printk(KERN_CONT "\n");
66e61a9e
TT		 2821 }
2822 if (es->s_last_error_time) {
ae0f78de 2823 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2824 sb->s_id, le32_to_cpu(es->s_last_error_time),
2825 (int) sizeof(es->s_last_error_func),
2826 es->s_last_error_func,
2827 le32_to_cpu(es->s_last_error_line));
2828 if (es->s_last_error_ino)
651e1c3b 2829 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2830 le32_to_cpu(es->s_last_error_ino));
2831 if (es->s_last_error_block)
651e1c3b 2832 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2833 le64_to_cpu(es->s_last_error_block));
651e1c3b 2834 printk(KERN_CONT "\n");
66e61a9e
TT		 2835 }
2836 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2837}
2838
bfff6873
LC		 2839/* Find next suitable group and run ext4_init_inode_table */
2840static int ext4_run_li_request(struct ext4_li_request *elr)
2841{
2842 struct ext4_group_desc *gdp = NULL;
2843 ext4_group_t group, ngroups;
2844 struct super_block *sb;
2845 unsigned long timeout = 0;
2846 int ret = 0;
2847
2848 sb = elr->lr_super;
2849 ngroups = EXT4_SB(sb)->s_groups_count;
2850
2851 for (group = elr->lr_next_group; group < ngroups; group++) {
2852 gdp = ext4_get_group_desc(sb, group, NULL);
2853 if (!gdp) {
2854 ret = 1;
2855 break;
2856 }
2857
2858 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2859 break;
2860 }
2861
7f511862 2862 if (group >= ngroups)
bfff6873
LC		 2863 ret = 1;
2864
2865 if (!ret) {
2866 timeout = jiffies;
2867 ret = ext4_init_inode_table(sb, group,
2868 elr->lr_timeout ? 0 : 1);
2869 if (elr->lr_timeout == 0) {
51ce6511
LC		 2870 timeout = (jiffies - timeout) *
2871 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2872 elr->lr_timeout = timeout;
2873 }
2874 elr->lr_next_sched = jiffies + elr->lr_timeout;
2875 elr->lr_next_group = group + 1;
2876 }
bfff6873
LC		 2877 return ret;
2878}
2879
2880/*
2881 * Remove lr_request from the list_request and free the
4ed5c033 2882 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2883 */
2884static void ext4_remove_li_request(struct ext4_li_request *elr)
2885{
2886 struct ext4_sb_info *sbi;
2887
2888 if (!elr)
2889 return;
2890
2891 sbi = elr->lr_sbi;
2892
2893 list_del(&elr->lr_request);
2894 sbi->s_li_request = NULL;
2895 kfree(elr);
2896}
2897
2898static void ext4_unregister_li_request(struct super_block *sb)
2899{
1bb933fb
LC		 2900 mutex_lock(&ext4_li_mtx);
2901 if (!ext4_li_info) {
2902 mutex_unlock(&ext4_li_mtx);
bfff6873 2903 return;
1bb933fb 2904 }
bfff6873
LC		 2905
2906 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2907 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2908 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2909 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2910}
2911
8f1f7453
ES		 2912static struct task_struct *ext4_lazyinit_task;
2913
bfff6873
LC		 2914/*
2915 * This is the function where ext4lazyinit thread lives. It walks
2916 * through the request list searching for next scheduled filesystem.
2917 * When such a fs is found, run the lazy initialization request
2918 * (ext4_rn_li_request) and keep track of the time spend in this
2919 * function. Based on that time we compute next schedule time of
2920 * the request. When walking through the list is complete, compute
2921 * next waking time and put itself into sleep.
2922 */
2923static int ext4_lazyinit_thread(void *arg)
2924{
2925 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2926 struct list_head *pos, *n;
2927 struct ext4_li_request *elr;
4ed5c033 2928 unsigned long next_wakeup, cur;
bfff6873
LC		 2929
2930 BUG_ON(NULL == eli);
2931
bfff6873
LC		 2932cont_thread:
2933 while (true) {
2934 next_wakeup = MAX_JIFFY_OFFSET;
2935
2936 mutex_lock(&eli->li_list_mtx);
2937 if (list_empty(&eli->li_request_list)) {
2938 mutex_unlock(&eli->li_list_mtx);
2939 goto exit_thread;
2940 }
bfff6873 2941 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 2942 int err = 0;
2943 int progress = 0;
bfff6873
LC		 2944 elr = list_entry(pos, struct ext4_li_request,
2945 lr_request);
2946
e22834f0
DM		 2947 if (time_before(jiffies, elr->lr_next_sched)) {
2948 if (time_before(elr->lr_next_sched, next_wakeup))
2949 next_wakeup = elr->lr_next_sched;
2950 continue;
2951 }
2952 if (down_read_trylock(&elr->lr_super->s_umount)) {
2953 if (sb_start_write_trylock(elr->lr_super)) {
2954 progress = 1;
2955 /*
2956 * We hold sb->s_umount, sb can not
2957 * be removed from the list, it is
2958 * now safe to drop li_list_mtx
2959 */
2960 mutex_unlock(&eli->li_list_mtx);
2961 err = ext4_run_li_request(elr);
2962 sb_end_write(elr->lr_super);
2963 mutex_lock(&eli->li_list_mtx);
2964 n = pos->next;
b2c78cd0 2965 }
e22834f0
DM		 2966 up_read((&elr->lr_super->s_umount));
2967 }
2968 /* error, remove the lazy_init job */
2969 if (err) {
2970 ext4_remove_li_request(elr);
2971 continue;
2972 }
2973 if (!progress) {
2974 elr->lr_next_sched = jiffies +
2975 (prandom_u32()
2976 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 2977 }
bfff6873
LC		 2978 if (time_before(elr->lr_next_sched, next_wakeup))
2979 next_wakeup = elr->lr_next_sched;
2980 }
2981 mutex_unlock(&eli->li_list_mtx);
2982
a0acae0e 2983 try_to_freeze();
bfff6873 2984
4ed5c033
LC		 2985 cur = jiffies;
2986 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2987 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2988 cond_resched();
2989 continue;
2990 }
2991
4ed5c033
LC		 2992 schedule_timeout_interruptible(next_wakeup - cur);
2993
8f1f7453
ES		 2994 if (kthread_should_stop()) {
2995 ext4_clear_request_list();
2996 goto exit_thread;
2997 }
bfff6873
LC		 2998 }
2999
3000exit_thread:
3001 /*
3002 * It looks like the request list is empty, but we need
3003 * to check it under the li_list_mtx lock, to prevent any
3004 * additions into it, and of course we should lock ext4_li_mtx
3005 * to atomically free the list and ext4_li_info, because at
3006 * this point another ext4 filesystem could be registering
3007 * new one.
3008 */
3009 mutex_lock(&ext4_li_mtx);
3010 mutex_lock(&eli->li_list_mtx);
3011 if (!list_empty(&eli->li_request_list)) {
3012 mutex_unlock(&eli->li_list_mtx);
3013 mutex_unlock(&ext4_li_mtx);
3014 goto cont_thread;
3015 }
3016 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3017 kfree(ext4_li_info);
3018 ext4_li_info = NULL;
3019 mutex_unlock(&ext4_li_mtx);
3020
3021 return 0;
3022}
3023
3024static void ext4_clear_request_list(void)
3025{
3026 struct list_head *pos, *n;
3027 struct ext4_li_request *elr;
3028
3029 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3030 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3031 elr = list_entry(pos, struct ext4_li_request,
3032 lr_request);
3033 ext4_remove_li_request(elr);
3034 }
3035 mutex_unlock(&ext4_li_info->li_list_mtx);
3036}
3037
3038static int ext4_run_lazyinit_thread(void)
3039{
8f1f7453
ES		 3040 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3041 ext4_li_info, "ext4lazyinit");
3042 if (IS_ERR(ext4_lazyinit_task)) {
3043 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3044 ext4_clear_request_list();
bfff6873
LC		 3045 kfree(ext4_li_info);
3046 ext4_li_info = NULL;
92b97816 3047 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3048 "initialization thread\n",
3049 err);
3050 return err;
3051 }
3052 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3053 return 0;
3054}
3055
3056/*
3057 * Check whether it make sense to run itable init. thread or not.
3058 * If there is at least one uninitialized inode table, return
3059 * corresponding group number, else the loop goes through all
3060 * groups and return total number of groups.
3061 */
3062static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3063{
3064 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3065 struct ext4_group_desc *gdp = NULL;
3066
3067 for (group = 0; group < ngroups; group++) {
3068 gdp = ext4_get_group_desc(sb, group, NULL);
3069 if (!gdp)
3070 continue;
3071
3072 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3073 break;
3074 }
3075
3076 return group;
3077}
3078
3079static int ext4_li_info_new(void)
3080{
3081 struct ext4_lazy_init *eli = NULL;
3082
3083 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3084 if (!eli)
3085 return -ENOMEM;
3086
bfff6873
LC		 3087 INIT_LIST_HEAD(&eli->li_request_list);
3088 mutex_init(&eli->li_list_mtx);
3089
bfff6873
LC		 3090 eli->li_state |= EXT4_LAZYINIT_QUIT;
3091
3092 ext4_li_info = eli;
3093
3094 return 0;
3095}
3096
3097static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3098 ext4_group_t start)
3099{
3100 struct ext4_sb_info *sbi = EXT4_SB(sb);
3101 struct ext4_li_request *elr;
bfff6873
LC		 3102
3103 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3104 if (!elr)
3105 return NULL;
3106
3107 elr->lr_super = sb;
3108 elr->lr_sbi = sbi;
3109 elr->lr_next_group = start;
3110
3111 /*
3112 * Randomize first schedule time of the request to
3113 * spread the inode table initialization requests
3114 * better.
3115 */
dd1f723b
TT		 3116 elr->lr_next_sched = jiffies + (prandom_u32() %
3117 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3118 return elr;
3119}
3120
7f511862
TT		 3121int ext4_register_li_request(struct super_block *sb,
3122 ext4_group_t first_not_zeroed)
bfff6873
LC		 3123{
3124 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3125 struct ext4_li_request *elr = NULL;
49598e04 3126 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3127 int ret = 0;
bfff6873 3128
7f511862 3129 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3130 if (sbi->s_li_request != NULL) {
3131 /*
3132 * Reset timeout so it can be computed again, because
3133 * s_li_wait_mult might have changed.
3134 */
3135 sbi->s_li_request->lr_timeout = 0;
7f511862 3136 goto out;
51ce6511 3137 }
bfff6873 3138
bc98a42c 3139 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
55ff3840 3140 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3141 goto out;
bfff6873
LC		 3142
3143 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3144 if (!elr) {
3145 ret = -ENOMEM;
3146 goto out;
3147 }
bfff6873
LC		 3148
3149 if (NULL == ext4_li_info) {
3150 ret = ext4_li_info_new();
3151 if (ret)
3152 goto out;
3153 }
3154
3155 mutex_lock(&ext4_li_info->li_list_mtx);
3156 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3157 mutex_unlock(&ext4_li_info->li_list_mtx);
3158
3159 sbi->s_li_request = elr;
46e4690b
TM		 3160 /*
3161 * set elr to NULL here since it has been inserted to
3162 * the request_list and the removal and free of it is
3163 * handled by ext4_clear_request_list from now on.
3164 */
3165 elr = NULL;
bfff6873
LC		 3166
3167 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3168 ret = ext4_run_lazyinit_thread();
3169 if (ret)
3170 goto out;
3171 }
bfff6873 3172out:
beed5ecb
NK		 3173 mutex_unlock(&ext4_li_mtx);
3174 if (ret)
bfff6873 3175 kfree(elr);
bfff6873
LC		 3176 return ret;
3177}
3178
3179/*
3180 * We do not need to lock anything since this is called on
3181 * module unload.
3182 */
3183static void ext4_destroy_lazyinit_thread(void)
3184{
3185 /*
3186 * If thread exited earlier
3187 * there's nothing to be done.
3188 */
8f1f7453 3189 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3190 return;
3191
8f1f7453 3192 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3193}
3194
25ed6e8a
DW		 3195static int set_journal_csum_feature_set(struct super_block *sb)
3196{
3197 int ret = 1;
3198 int compat, incompat;
3199 struct ext4_sb_info *sbi = EXT4_SB(sb);
3200
9aa5d32b 3201 if (ext4_has_metadata_csum(sb)) {
db9ee220 3202 /* journal checksum v3 */
25ed6e8a 3203 compat = 0;
db9ee220 3204 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3205 } else {
3206 /* journal checksum v1 */
3207 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3208 incompat = 0;
3209 }
3210
feb8c6d3
DW		 3211 jbd2_journal_clear_features(sbi->s_journal,
3212 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3213 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3214 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3215 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3216 ret = jbd2_journal_set_features(sbi->s_journal,
3217 compat, 0,
3218 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3219 incompat);
3220 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3221 ret = jbd2_journal_set_features(sbi->s_journal,
3222 compat, 0,
3223 incompat);
3224 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3225 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3226 } else {
feb8c6d3
DW		 3227 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3228 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3229 }
3230
3231 return ret;
3232}
3233
952fc18e
TT		 3234/*
3235 * Note: calculating the overhead so we can be compatible with
3236 * historical BSD practice is quite difficult in the face of
3237 * clusters/bigalloc. This is because multiple metadata blocks from
3238 * different block group can end up in the same allocation cluster.
3239 * Calculating the exact overhead in the face of clustered allocation
3240 * requires either O(all block bitmaps) in memory or O(number of block
3241 * groups**2) in time. We will still calculate the superblock for
3242 * older file systems --- and if we come across with a bigalloc file
3243 * system with zero in s_overhead_clusters the estimate will be close to
3244 * correct especially for very large cluster sizes --- but for newer
3245 * file systems, it's better to calculate this figure once at mkfs
3246 * time, and store it in the superblock. If the superblock value is
3247 * present (even for non-bigalloc file systems), we will use it.
3248 */
3249static int count_overhead(struct super_block *sb, ext4_group_t grp,
3250 char *buf)
3251{
3252 struct ext4_sb_info *sbi = EXT4_SB(sb);
3253 struct ext4_group_desc *gdp;
3254 ext4_fsblk_t first_block, last_block, b;
3255 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3256 int s, j, count = 0;
3257
e2b911c5 3258 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3259 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3260 sbi->s_itb_per_group + 2);
3261
952fc18e
TT		 3262 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3263 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3264 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3265 for (i = 0; i < ngroups; i++) {
3266 gdp = ext4_get_group_desc(sb, i, NULL);
3267 b = ext4_block_bitmap(sb, gdp);
3268 if (b >= first_block && b <= last_block) {
3269 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3270 count++;
3271 }
3272 b = ext4_inode_bitmap(sb, gdp);
3273 if (b >= first_block && b <= last_block) {
3274 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3275 count++;
3276 }
3277 b = ext4_inode_table(sb, gdp);
3278 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3279 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3280 int c = EXT4_B2C(sbi, b - first_block);
3281 ext4_set_bit(c, buf);
3282 count++;
3283 }
3284 if (i != grp)
3285 continue;
3286 s = 0;
3287 if (ext4_bg_has_super(sb, grp)) {
3288 ext4_set_bit(s++, buf);
3289 count++;
3290 }
c48ae41b
TT		 3291 j = ext4_bg_num_gdb(sb, grp);
3292 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3293 ext4_error(sb, "Invalid number of block group "
3294 "descriptor blocks: %d", j);
3295 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3296 }
c48ae41b
TT		 3297 count += j;
3298 for (; j > 0; j--)
3299 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3300 }
3301 if (!count)
3302 return 0;
3303 return EXT4_CLUSTERS_PER_GROUP(sb) -
3304 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3305}
3306
3307/*
3308 * Compute the overhead and stash it in sbi->s_overhead
3309 */
3310int ext4_calculate_overhead(struct super_block *sb)
3311{
3312 struct ext4_sb_info *sbi = EXT4_SB(sb);
3313 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3314 struct inode *j_inode;
3315 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3316 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3317 ext4_fsblk_t overhead = 0;
4fdb5543 3318 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3319
952fc18e
TT		 3320 if (!buf)
3321 return -ENOMEM;
3322
3323 /*
3324 * Compute the overhead (FS structures). This is constant
3325 * for a given filesystem unless the number of block groups
3326 * changes so we cache the previous value until it does.
3327 */
3328
3329 /*
3330 * All of the blocks before first_data_block are overhead
3331 */
3332 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3333
3334 /*
3335 * Add the overhead found in each block group
3336 */
3337 for (i = 0; i < ngroups; i++) {
3338 int blks;
3339
3340 blks = count_overhead(sb, i, buf);
3341 overhead += blks;
3342 if (blks)
3343 memset(buf, 0, PAGE_SIZE);
3344 cond_resched();
3345 }
3c816ded
EW		 3346
3347 /*
3348 * Add the internal journal blocks whether the journal has been
3349 * loaded or not
3350 */
b003b524 3351 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3352 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3353 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3354 j_inode = ext4_get_journal_inode(sb, j_inum);
3355 if (j_inode) {
3356 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3357 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3358 iput(j_inode);
3359 } else {
3360 ext4_msg(sb, KERN_ERR, "can't get journal size");
3361 }
3362 }
952fc18e
TT		 3363 sbi->s_overhead = overhead;
3364 smp_wmb();
3365 free_page((unsigned long) buf);
3366 return 0;
3367}
3368
b5799018 3369static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3370{
3371 ext4_fsblk_t resv_clusters;
b5799018 3372 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3373
30fac0f7
JK		 3374 /*
3375 * There's no need to reserve anything when we aren't using extents.
3376 * The space estimates are exact, there are no unwritten extents,
3377 * hole punching doesn't need new metadata... This is needed especially
3378 * to keep ext2/3 backward compatibility.
3379 */
e2b911c5 3380 if (!ext4_has_feature_extents(sb))
b5799018 3381 return;
27dd4385
LC		 3382 /*
3383 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3384 * This should cover the situations where we can not afford to run
3385 * out of space like for example punch hole, or converting
556615dc 3386 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3387 * allocation would require 1, or 2 blocks, higher numbers are
3388 * very rare.
3389 */
b5799018
TT		 3390 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3391 sbi->s_cluster_bits);
27dd4385
LC		 3392
3393 do_div(resv_clusters, 50);
3394 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3395
b5799018 3396 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3397}
3398
2b2d6d01 3399static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3400{
5e405595 3401 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3402 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3403 struct buffer_head *bh;
617ba13b 3404 struct ext4_super_block *es = NULL;
5aee0f8a 3405 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3406 ext4_fsblk_t block;
3407 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3408 ext4_fsblk_t logical_sb_block;
ac27a0ec 3409 unsigned long offset = 0;
ac27a0ec
DK		 3410 unsigned long journal_devnum = 0;
3411 unsigned long def_mount_opts;
3412 struct inode *root;
0390131b 3413 const char *descr;
dcc7dae3 3414 int ret = -ENOMEM;
281b5995 3415 int blocksize, clustersize;
4ec11028
TT		 3416 unsigned int db_count;
3417 unsigned int i;
281b5995 3418 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3419 __u64 blocks_count;
07aa2ea1 3420 int err = 0;
b3881f74 3421 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3422 ext4_group_t first_not_zeroed;
ac27a0ec 3423
5aee0f8a
TT		 3424 if ((data && !orig_data) || !sbi)
3425 goto out_free_base;
705895b6 3426
aed9eb1b 3427 sbi->s_daxdev = dax_dev;
705895b6
PE		 3428 sbi->s_blockgroup_lock =
3429 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3430 if (!sbi->s_blockgroup_lock)
3431 goto out_free_base;
3432
ac27a0ec 3433 sb->s_fs_info = sbi;
2c0544b2 3434 sbi->s_sb = sb;
240799cd 3435 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3436 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3437 if (sb->s_bdev->bd_part)
3438 sbi->s_sectors_written_start =
3439 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3440
9f6200bb 3441 /* Cleanup superblock name */
ec3904dc 3442 strreplace(sb->s_id, '/', '!');
9f6200bb 3443
07aa2ea1 3444 /* -EINVAL is default */
dcc7dae3 3445 ret = -EINVAL;
617ba13b 3446 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3447 if (!blocksize) {
b31e1552 3448 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3449 goto out_fail;
3450 }
3451
3452 /*
617ba13b 3453 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3454 * block sizes. We need to calculate the offset from buffer start.
3455 */
617ba13b 3456 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3457 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3458 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3459 } else {
70bbb3e0 3460 logical_sb_block = sb_block;
ac27a0ec
DK		 3461 }
3462
a8ac900b 3463 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3464 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3465 goto out_fail;
3466 }
3467 /*
3468 * Note: s_es must be initialized as soon as possible because
617ba13b 3469 * some ext4 macro-instructions depend on its value
ac27a0ec 3470 */
2716b802 3471 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3472 sbi->s_es = es;
3473 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3474 if (sb->s_magic != EXT4_SUPER_MAGIC)
3475 goto cantfind_ext4;
afc32f7e 3476 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3477
feb0ab32 3478 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3479 if (ext4_has_feature_metadata_csum(sb) &&
3480 ext4_has_feature_gdt_csum(sb))
363307e6 3481 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3482 "redundant flags; please run fsck.");
3483
d25425f8
DW		 3484 /* Check for a known checksum algorithm */
3485 if (!ext4_verify_csum_type(sb, es)) {
3486 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3487 "unknown checksum algorithm.");
3488 silent = 1;
3489 goto cantfind_ext4;
3490 }
3491
0441984a 3492 /* Load the checksum driver */
dec214d0
TE		 3493 if (ext4_has_feature_metadata_csum(sb) ||
3494 ext4_has_feature_ea_inode(sb)) {
0441984a
DW		 3495 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3496 if (IS_ERR(sbi->s_chksum_driver)) {
3497 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3498 ret = PTR_ERR(sbi->s_chksum_driver);
3499 sbi->s_chksum_driver = NULL;
3500 goto failed_mount;
3501 }
3502 }
3503
a9c47317
DW		 3504 /* Check superblock checksum */
3505 if (!ext4_superblock_csum_verify(sb, es)) {
3506 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3507 "invalid superblock checksum. Run e2fsck?");
3508 silent = 1;
6a797d27 3509 ret = -EFSBADCRC;
a9c47317
DW		 3510 goto cantfind_ext4;
3511 }
3512
3513 /* Precompute checksum seed for all metadata */
e2b911c5 3514 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3515 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3516 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3517 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3518 sizeof(es->s_uuid));
3519
ac27a0ec
DK		 3520 /* Set defaults before we parse the mount options */
3521 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3522 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3523 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3524 set_opt(sb, DEBUG);
87f26807 3525 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3526 set_opt(sb, GRPID);
617ba13b 3527 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3528 set_opt(sb, NO_UID32);
ea663336 3529 /* xattr user namespace & acls are now defaulted on */
ea663336 3530 set_opt(sb, XATTR_USER);
03010a33 3531#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3532 set_opt(sb, POSIX_ACL);
2e7842b8 3533#endif
98c1a759
DW		 3534 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3535 if (ext4_has_metadata_csum(sb))
3536 set_opt(sb, JOURNAL_CHECKSUM);
3537
617ba13b 3538 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3539 set_opt(sb, JOURNAL_DATA);
617ba13b 3540 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3541 set_opt(sb, ORDERED_DATA);
617ba13b 3542 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3543 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3544
3545 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3546 set_opt(sb, ERRORS_PANIC);
bb4f397a 3547 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3548 set_opt(sb, ERRORS_CONT);
bb4f397a 3549 else
fd8c37ec 3550 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3551 /* block_validity enabled by default; disable with noblock_validity */
3552 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3553 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3554 set_opt(sb, DISCARD);
ac27a0ec 3555
08cefc7a
EB		 3556 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3557 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3558 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3559 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3560 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3561
8b67f04a 3562 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3563 set_opt(sb, BARRIER);
ac27a0ec 3564
dd919b98
AK		 3565 /*
3566 * enable delayed allocation by default
3567 * Use -o nodelalloc to turn it off
3568 */
bc0b75f7 3569 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3570 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3571 set_opt(sb, DELALLOC);
dd919b98 3572
51ce6511
LC		 3573 /*
3574 * set default s_li_wait_mult for lazyinit, for the case there is
3575 * no mount option specified.
3576 */
3577 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3578
5aee0f8a
TT		 3579 if (sbi->s_es->s_mount_opts[0]) {
3580 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3581 sizeof(sbi->s_es->s_mount_opts),
3582 GFP_KERNEL);
3583 if (!s_mount_opts)
3584 goto failed_mount;
3585 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3586 &journal_ioprio, 0)) {
3587 ext4_msg(sb, KERN_WARNING,
3588 "failed to parse options in superblock: %s",
3589 s_mount_opts);
3590 }
3591 kfree(s_mount_opts);
8b67f04a 3592 }
5a916be1 3593 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3594 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3595 &journal_ioprio, 0))
ac27a0ec
DK		 3596 goto failed_mount;
3597
56889787
TT		 3598 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3599 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3600 "with data=journal disables delayed "
3601 "allocation and O_DIRECT support!\n");
3602 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3603 ext4_msg(sb, KERN_ERR, "can't mount with "
3604 "both data=journal and delalloc");
3605 goto failed_mount;
3606 }
3607 if (test_opt(sb, DIOREAD_NOLOCK)) {
3608 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3609 "both data=journal and dioread_nolock");
56889787
TT		 3610 goto failed_mount;
3611 }
923ae0ff
RZ		 3612 if (test_opt(sb, DAX)) {
3613 ext4_msg(sb, KERN_ERR, "can't mount with "
3614 "both data=journal and dax");
3615 goto failed_mount;
3616 }
73b92a2a
SK		 3617 if (ext4_has_feature_encrypt(sb)) {
3618 ext4_msg(sb, KERN_WARNING,
3619 "encrypted files will use data=ordered "
3620 "instead of data journaling mode");
3621 }
56889787
TT		 3622 if (test_opt(sb, DELALLOC))
3623 clear_opt(sb, DELALLOC);
001e4a87
TH		 3624 } else {
3625 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3626 }
3627
1751e8a6
LT		 3628 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3629 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 3630
617ba13b 3631 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3632 (ext4_has_compat_features(sb) ||
3633 ext4_has_ro_compat_features(sb) ||
3634 ext4_has_incompat_features(sb)))
b31e1552
ES		 3635 ext4_msg(sb, KERN_WARNING,
3636 "feature flags set on rev 0 fs, "
3637 "running e2fsck is recommended");
469108ff 3638
ed3654eb
TT		 3639 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3640 set_opt2(sb, HURD_COMPAT);
e2b911c5 3641 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3642 ext4_msg(sb, KERN_ERR,
3643 "The Hurd can't support 64-bit file systems");
3644 goto failed_mount;
3645 }
dec214d0
TE		 3646
3647 /*
3648 * ea_inode feature uses l_i_version field which is not
3649 * available in HURD_COMPAT mode.
3650 */
3651 if (ext4_has_feature_ea_inode(sb)) {
3652 ext4_msg(sb, KERN_ERR,
3653 "ea_inode feature is not supported for Hurd");
3654 goto failed_mount;
3655 }
ed3654eb
TT		 3656 }
3657
2035e776
TT		 3658 if (IS_EXT2_SB(sb)) {
3659 if (ext2_feature_set_ok(sb))
3660 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3661 "using the ext4 subsystem");
3662 else {
3663 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3664 "to feature incompatibilities");
3665 goto failed_mount;
3666 }
3667 }
3668
3669 if (IS_EXT3_SB(sb)) {
3670 if (ext3_feature_set_ok(sb))
3671 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3672 "using the ext4 subsystem");
3673 else {
3674 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3675 "to feature incompatibilities");
3676 goto failed_mount;
3677 }
3678 }
3679
ac27a0ec
DK		 3680 /*
3681 * Check feature flags regardless of the revision level, since we
3682 * previously didn't change the revision level when setting the flags,
3683 * so there is a chance incompat flags are set on a rev 0 filesystem.
3684 */
bc98a42c 3685 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 3686 goto failed_mount;
a13fb1a4 3687
261cb20c 3688 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3689 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3690 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552 3691 ext4_msg(sb, KERN_ERR,
8cdf3372
TT		 3692 "Unsupported filesystem blocksize %d (%d log_block_size)",
3693 blocksize, le32_to_cpu(es->s_log_block_size));
3694 goto failed_mount;
3695 }
3696 if (le32_to_cpu(es->s_log_block_size) >
3697 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3698 ext4_msg(sb, KERN_ERR,
3699 "Invalid log block size: %u",
3700 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3701 goto failed_mount;
3702 }
3703
5b9554dc
TT		 3704 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3705 ext4_msg(sb, KERN_ERR,
3706 "Number of reserved GDT blocks insanely large: %d",
3707 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3708 goto failed_mount;
3709 }
3710
923ae0ff 3711 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
559db4c6
RZ		 3712 if (ext4_has_feature_inline_data(sb)) {
3713 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3714 " that may contain inline data");
24f3478d 3715 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
559db4c6 3716 }
87eefeb4 3717 err = bdev_dax_supported(sb, blocksize);
24f3478d
DW		 3718 if (err) {
3719 ext4_msg(sb, KERN_ERR,
3720 "DAX unsupported by block device. Turning off DAX.");
3721 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
3722 }
923ae0ff
RZ		 3723 }
3724
e2b911c5 3725 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3726 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3727 es->s_encryption_level);
3728 goto failed_mount;
3729 }
3730
ac27a0ec 3731 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3732 /* Validate the filesystem blocksize */
3733 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3734 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3735 blocksize);
ac27a0ec
DK		 3736 goto failed_mount;
3737 }
3738
2b2d6d01 3739 brelse(bh);
70bbb3e0
AM		 3740 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3741 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3742 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3743 if (!bh) {
b31e1552
ES		 3744 ext4_msg(sb, KERN_ERR,
3745 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3746 goto failed_mount;
3747 }
2716b802 3748 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3749 sbi->s_es = es;
617ba13b 3750 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3751 ext4_msg(sb, KERN_ERR,
3752 "Magic mismatch, very weird!");
ac27a0ec
DK		 3753 goto failed_mount;
3754 }
3755 }
3756
e2b911c5 3757 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3758 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3759 has_huge_files);
3760 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3761
617ba13b
MC		 3762 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3763 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3764 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3765 } else {
3766 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3767 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3768 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3769 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3770 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3771 ext4_msg(sb, KERN_ERR,
3772 "unsupported inode size: %d",
2b2d6d01 3773 sbi->s_inode_size);
ac27a0ec
DK		 3774 goto failed_mount;
3775 }
ef7f3835
KS		 3776 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3777 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3778 }
0b8e58a1 3779
0d1ee42f 3780 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3781 if (ext4_has_feature_64bit(sb)) {
8fadc143 3782 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3783 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3784 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3785 ext4_msg(sb, KERN_ERR,
3786 "unsupported descriptor size %lu",
0d1ee42f
AR		 3787 sbi->s_desc_size);
3788 goto failed_mount;
3789 }
3790 } else
3791 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3792
ac27a0ec 3793 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3794 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 3795
617ba13b 3796 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3797 if (sbi->s_inodes_per_block == 0)
617ba13b 3798 goto cantfind_ext4;
cd6bb35b
TT		 3799 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3800 sbi->s_inodes_per_group > blocksize * 8) {
3801 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3802 sbi->s_blocks_per_group);
3803 goto failed_mount;
3804 }
ac27a0ec
DK		 3805 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3806 sbi->s_inodes_per_block;
0d1ee42f 3807 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3808 sbi->s_sbh = bh;
3809 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3810 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3811 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3812
2b2d6d01 3813 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3814 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3815 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3816 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3817 i = le32_to_cpu(es->s_flags);
3818 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3819 sbi->s_hash_unsigned = 3;
3820 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3821#ifdef __CHAR_UNSIGNED__
bc98a42c 3822 if (!sb_rdonly(sb))
23301410
TT		 3823 es->s_flags |=
3824 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3825 sbi->s_hash_unsigned = 3;
f99b2589 3826#else
bc98a42c 3827 if (!sb_rdonly(sb))
23301410
TT		 3828 es->s_flags |=
3829 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3830#endif
23301410 3831 }
f99b2589 3832 }
ac27a0ec 3833
281b5995
TT		 3834 /* Handle clustersize */
3835 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3836 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3837 if (has_bigalloc) {
3838 if (clustersize < blocksize) {
3839 ext4_msg(sb, KERN_ERR,
3840 "cluster size (%d) smaller than "
3841 "block size (%d)", clustersize, blocksize);
3842 goto failed_mount;
3843 }
8cdf3372
TT		 3844 if (le32_to_cpu(es->s_log_cluster_size) >
3845 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3846 ext4_msg(sb, KERN_ERR,
3847 "Invalid log cluster size: %u",
3848 le32_to_cpu(es->s_log_cluster_size));
3849 goto failed_mount;
3850 }
281b5995
TT		 3851 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3852 le32_to_cpu(es->s_log_block_size);
3853 sbi->s_clusters_per_group =
3854 le32_to_cpu(es->s_clusters_per_group);
3855 if (sbi->s_clusters_per_group > blocksize * 8) {
3856 ext4_msg(sb, KERN_ERR,
3857 "#clusters per group too big: %lu",
3858 sbi->s_clusters_per_group);
3859 goto failed_mount;
3860 }
3861 if (sbi->s_blocks_per_group !=
3862 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3863 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3864 "clusters per group (%lu) inconsistent",
3865 sbi->s_blocks_per_group,
3866 sbi->s_clusters_per_group);
3867 goto failed_mount;
3868 }
3869 } else {
3870 if (clustersize != blocksize) {
3871 ext4_warning(sb, "fragment/cluster size (%d) != "
3872 "block size (%d)", clustersize,
3873 blocksize);
3874 clustersize = blocksize;
3875 }
3876 if (sbi->s_blocks_per_group > blocksize * 8) {
3877 ext4_msg(sb, KERN_ERR,
3878 "#blocks per group too big: %lu",
3879 sbi->s_blocks_per_group);
3880 goto failed_mount;
3881 }
3882 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3883 sbi->s_cluster_bits = 0;
ac27a0ec 3884 }
281b5995
TT		 3885 sbi->s_cluster_ratio = clustersize / blocksize;
3886
960fd856
TT		 3887 /* Do we have standard group size of clustersize * 8 blocks ? */
3888 if (sbi->s_blocks_per_group == clustersize << 3)
3889 set_opt2(sb, STD_GROUP_SIZE);
3890
bf43d84b
ES		 3891 /*
3892 * Test whether we have more sectors than will fit in sector_t,
3893 * and whether the max offset is addressable by the page cache.
3894 */
5a9ae68a 3895 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3896 ext4_blocks_count(es));
5a9ae68a 3897 if (err) {
b31e1552 3898 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3899 " too large to mount safely on this system");
ac27a0ec 3900 if (sizeof(sector_t) < 8)
90c699a9 3901 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3902 goto failed_mount;
3903 }
3904
617ba13b
MC		 3905 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3906 goto cantfind_ext4;
e7c95593 3907
0f2ddca6
FTN		 3908 /* check blocks count against device size */
3909 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3910 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3911 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3912 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3913 ext4_blocks_count(es), blocks_count);
3914 goto failed_mount;
3915 }
3916
0b8e58a1
AD		 3917 /*
3918 * It makes no sense for the first data block to be beyond the end
3919 * of the filesystem.
3920 */
3921 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3922 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3923 "block %u is beyond end of filesystem (%llu)",
3924 le32_to_cpu(es->s_first_data_block),
3925 ext4_blocks_count(es));
e7c95593
ES		 3926 goto failed_mount;
3927 }
bd81d8ee
LV		 3928 blocks_count = (ext4_blocks_count(es) -
3929 le32_to_cpu(es->s_first_data_block) +
3930 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3931 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3932 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3933 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3934 "(block count %llu, first data block %u, "
b31e1552 3935 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3936 ext4_blocks_count(es),
3937 le32_to_cpu(es->s_first_data_block),
3938 EXT4_BLOCKS_PER_GROUP(sb));
3939 goto failed_mount;
3940 }
bd81d8ee 3941 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3942 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3943 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3944 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3945 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 3946 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 3947 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 3948 ext4_msg(sb, KERN_WARNING,
3949 "first meta block group too large: %u "
3950 "(group descriptor block count %u)",
3951 le32_to_cpu(es->s_first_meta_bg), db_count);
3952 goto failed_mount;
3953 }
3954 }
a7c3e901 3955 sbi->s_group_desc = kvmalloc(db_count *
f18a5f21
TT		 3956 sizeof(struct buffer_head *),
3957 GFP_KERNEL);
ac27a0ec 3958 if (sbi->s_group_desc == NULL) {
b31e1552 3959 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3960 ret = -ENOMEM;
ac27a0ec
DK		 3961 goto failed_mount;
3962 }
3963
705895b6 3964 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 3965
85c8f176
AP		 3966 /* Pre-read the descriptors into the buffer cache */
3967 for (i = 0; i < db_count; i++) {
3968 block = descriptor_loc(sb, logical_sb_block, i);
3969 sb_breadahead(sb, block);
3970 }
3971
ac27a0ec 3972 for (i = 0; i < db_count; i++) {
70bbb3e0 3973 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3974 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3975 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3976 ext4_msg(sb, KERN_ERR,
3977 "can't read group descriptor %d", i);
ac27a0ec
DK		 3978 db_count = i;
3979 goto failed_mount2;
3980 }
3981 }
829fa70d 3982 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 3983 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3984 ret = -EFSCORRUPTED;
f9ae9cf5 3985 goto failed_mount2;
ac27a0ec 3986 }
772cb7c8 3987
f9ae9cf5 3988 sbi->s_gdb_count = db_count;
ac27a0ec 3989
235699a8 3990 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 3991
a75ae78f 3992 /* Register extent status tree shrinker */
eb68d0e2 3993 if (ext4_es_register_shrinker(sbi))
ce7e010a 3994 goto failed_mount3;
ce7e010a 3995
c9de560d 3996 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3997 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3998
f9ae9cf5
TT		 3999 /*
4000 * set up enough so that it can read an inode
4001 */
f6e63f90 4002 sb->s_op = &ext4_sops;
617ba13b
MC		 4003 sb->s_export_op = &ext4_export_ops;
4004 sb->s_xattr = ext4_xattr_handlers;
ffcc4182 4005#ifdef CONFIG_EXT4_FS_ENCRYPTION
a7550b30 4006 sb->s_cop = &ext4_cryptops;
ffcc4182 4007#endif
ac27a0ec 4008#ifdef CONFIG_QUOTA
617ba13b 4009 sb->dq_op = &ext4_quota_operations;
e2b911c5 4010 if (ext4_has_feature_quota(sb))
1fa5efe3 4011 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4012 else
4013 sb->s_qcop = &ext4_qctl_operations;
689c958c 4014 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4015#endif
85787090 4016 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4017
ac27a0ec 4018 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4019 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4020
4021 sb->s_root = NULL;
4022
4023 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4024 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4025
bc98a42c 4026 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4027 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4028 goto failed_mount3a;
c5e06d10 4029
ac27a0ec
DK		 4030 /*
4031 * The first inode we look at is the journal inode. Don't try
4032 * root first: it may be modified in the journal!
4033 */
e2b911c5 4034 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4035 err = ext4_load_journal(sb, es, journal_devnum);
4036 if (err)
50460fe8 4037 goto failed_mount3a;
bc98a42c 4038 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4039 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4040 ext4_msg(sb, KERN_ERR, "required journal recovery "
4041 "suppressed and not mounted read-only");
744692dc 4042 goto failed_mount_wq;
ac27a0ec 4043 } else {
1e381f60
DM		 4044 /* Nojournal mode, all journal mount options are illegal */
4045 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4046 ext4_msg(sb, KERN_ERR, "can't mount with "
4047 "journal_checksum, fs mounted w/o journal");
4048 goto failed_mount_wq;
4049 }
4050 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4051 ext4_msg(sb, KERN_ERR, "can't mount with "
4052 "journal_async_commit, fs mounted w/o journal");
4053 goto failed_mount_wq;
4054 }
4055 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4056 ext4_msg(sb, KERN_ERR, "can't mount with "
4057 "commit=%lu, fs mounted w/o journal",
4058 sbi->s_commit_interval / HZ);
4059 goto failed_mount_wq;
4060 }
4061 if (EXT4_MOUNT_DATA_FLAGS &
4062 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4063 ext4_msg(sb, KERN_ERR, "can't mount with "
4064 "data=, fs mounted w/o journal");
4065 goto failed_mount_wq;
4066 }
4067 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
4068 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4069 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4070 sbi->s_journal = NULL;
4071 needs_recovery = 0;
4072 goto no_journal;
ac27a0ec
DK		 4073 }
4074
e2b911c5 4075 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4076 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4077 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4078 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4079 goto failed_mount_wq;
eb40a09c
JS		 4080 }
4081
25ed6e8a
DW		 4082 if (!set_journal_csum_feature_set(sb)) {
4083 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4084 "feature set");
4085 goto failed_mount_wq;
d4da6c9c 4086 }
818d276c 4087
ac27a0ec
DK		 4088 /* We have now updated the journal if required, so we can
4089 * validate the data journaling mode. */
4090 switch (test_opt(sb, DATA_FLAGS)) {
4091 case 0:
4092 /* No mode set, assume a default based on the journal
63f57933
AM		 4093 * capabilities: ORDERED_DATA if the journal can
4094 * cope, else JOURNAL_DATA
4095 */
dab291af
MC		 4096 if (jbd2_journal_check_available_features
4097 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4098 set_opt(sb, ORDERED_DATA);
ac27a0ec 4099 else
fd8c37ec 4100 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4101 break;
4102
617ba13b
MC		 4103 case EXT4_MOUNT_ORDERED_DATA:
4104 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4105 if (!jbd2_journal_check_available_features
4106 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4107 ext4_msg(sb, KERN_ERR, "Journal does not support "
4108 "requested data journaling mode");
744692dc 4109 goto failed_mount_wq;
ac27a0ec
DK		 4110 }
4111 default:
4112 break;
4113 }
ab04df78
JK		 4114
4115 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4116 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4117 ext4_msg(sb, KERN_ERR, "can't mount with "
4118 "journal_async_commit in data=ordered mode");
4119 goto failed_mount_wq;
4120 }
4121
b3881f74 4122 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4123
18aadd47
BJ		 4124 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4125
ce7e010a 4126no_journal:
cdb7ee4c
TE		 4127 if (!test_opt(sb, NO_MBCACHE)) {
4128 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4129 if (!sbi->s_ea_block_cache) {
dec214d0 4130 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4131 "Failed to create ea_block_cache");
dec214d0
TE		 4132 goto failed_mount_wq;
4133 }
cdb7ee4c
TE		 4134
4135 if (ext4_has_feature_ea_inode(sb)) {
4136 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4137 if (!sbi->s_ea_inode_cache) {
4138 ext4_msg(sb, KERN_ERR,
4139 "Failed to create ea_inode_cache");
4140 goto failed_mount_wq;
4141 }
4142 }
9c191f70
M		 4143 }
4144
e2b911c5 4145 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 4146 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 4147 ext4_msg(sb, KERN_ERR,
4148 "Unsupported blocksize for fs encryption");
4149 goto failed_mount_wq;
4150 }
4151
bc98a42c 4152 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4153 !ext4_has_feature_encrypt(sb)) {
4154 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4155 ext4_commit_super(sb, 1);
4156 }
4157
952fc18e
TT		 4158 /*
4159 * Get the # of file system overhead blocks from the
4160 * superblock if present.
4161 */
4162 if (es->s_overhead_clusters)
4163 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4164 else {
07aa2ea1
LC		 4165 err = ext4_calculate_overhead(sb);
4166 if (err)
952fc18e
TT		 4167 goto failed_mount_wq;
4168 }
4169
fd89d5f2
TH		 4170 /*
4171 * The maximum number of concurrent works can be high and
4172 * concurrency isn't really necessary. Limit it to 1.
4173 */
2e8fa54e
JK		 4174 EXT4_SB(sb)->rsv_conversion_wq =
4175 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4176 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4177 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4178 ret = -ENOMEM;
2e8fa54e
JK		 4179 goto failed_mount4;
4180 }
4181
ac27a0ec 4182 /*
dab291af 4183 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4184 * so we can safely mount the rest of the filesystem now.
4185 */
4186
1d1fe1ee
DH		 4187 root = ext4_iget(sb, EXT4_ROOT_INO);
4188 if (IS_ERR(root)) {
b31e1552 4189 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4190 ret = PTR_ERR(root);
32a9bb57 4191 root = NULL;
ac27a0ec
DK		 4192 goto failed_mount4;
4193 }
4194 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4195 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4196 iput(root);
ac27a0ec
DK		 4197 goto failed_mount4;
4198 }
48fde701 4199 sb->s_root = d_make_root(root);
1d1fe1ee 4200 if (!sb->s_root) {
b31e1552 4201 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4202 ret = -ENOMEM;
4203 goto failed_mount4;
4204 }
ac27a0ec 4205
bc98a42c 4206 if (ext4_setup_super(sb, es, sb_rdonly(sb)))
1751e8a6 4207 sb->s_flags |= SB_RDONLY;
ef7f3835
KS		 4208
4209 /* determine the minimum size of new large inodes, if present */
670e9875
TT		 4210 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
4211 sbi->s_want_extra_isize == 0) {
ef7f3835
KS		 4212 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4213 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 4214 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 4215 if (sbi->s_want_extra_isize <
4216 le16_to_cpu(es->s_want_extra_isize))
4217 sbi->s_want_extra_isize =
4218 le16_to_cpu(es->s_want_extra_isize);
4219 if (sbi->s_want_extra_isize <
4220 le16_to_cpu(es->s_min_extra_isize))
4221 sbi->s_want_extra_isize =
4222 le16_to_cpu(es->s_min_extra_isize);
4223 }
4224 }
4225 /* Check if enough inode space is available */
4226 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4227 sbi->s_inode_size) {
4228 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4229 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4230 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4231 "available");
ef7f3835
KS		 4232 }
4233
b5799018 4234 ext4_set_resv_clusters(sb);
27dd4385 4235
6fd058f7
TT		 4236 err = ext4_setup_system_zone(sb);
4237 if (err) {
b31e1552 4238 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4239 "zone (%d)", err);
f9ae9cf5
TT		 4240 goto failed_mount4a;
4241 }
4242
4243 ext4_ext_init(sb);
4244 err = ext4_mb_init(sb);
4245 if (err) {
4246 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4247 err);
dcf2d804 4248 goto failed_mount5;
c2774d84
AK		 4249 }
4250
d5e03cbb
TT		 4251 block = ext4_count_free_clusters(sb);
4252 ext4_free_blocks_count_set(sbi->s_es,
4253 EXT4_C2B(sbi, block));
908c7f19
TH		 4254 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4255 GFP_KERNEL);
d5e03cbb
TT		 4256 if (!err) {
4257 unsigned long freei = ext4_count_free_inodes(sb);
4258 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4259 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4260 GFP_KERNEL);
d5e03cbb
TT		 4261 }
4262 if (!err)
4263 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4264 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4265 if (!err)
908c7f19
TH		 4266 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4267 GFP_KERNEL);
c8585c6f
DJ		 4268 if (!err)
4269 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4270
d5e03cbb
TT		 4271 if (err) {
4272 ext4_msg(sb, KERN_ERR, "insufficient memory");
4273 goto failed_mount6;
4274 }
4275
e2b911c5 4276 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4277 if (!ext4_fill_flex_info(sb)) {
4278 ext4_msg(sb, KERN_ERR,
4279 "unable to initialize "
4280 "flex_bg meta info!");
4281 goto failed_mount6;
4282 }
4283
bfff6873
LC		 4284 err = ext4_register_li_request(sb, first_not_zeroed);
4285 if (err)
dcf2d804 4286 goto failed_mount6;
bfff6873 4287
b5799018 4288 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4289 if (err)
4290 goto failed_mount7;
3197ebdb 4291
9b2ff357
JK		 4292#ifdef CONFIG_QUOTA
4293 /* Enable quota usage during mount. */
bc98a42c 4294 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4295 err = ext4_enable_quotas(sb);
4296 if (err)
4297 goto failed_mount8;
4298 }
4299#endif /* CONFIG_QUOTA */
4300
617ba13b
MC		 4301 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4302 ext4_orphan_cleanup(sb, es);
4303 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4304 if (needs_recovery) {
b31e1552 4305 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4306 ext4_mark_recovery_complete(sb, es);
4307 }
4308 if (EXT4_SB(sb)->s_journal) {
4309 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4310 descr = " journalled data mode";
4311 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4312 descr = " ordered data mode";
4313 else
4314 descr = " writeback data mode";
4315 } else
4316 descr = "out journal";
4317
79add3a3
LC		 4318 if (test_opt(sb, DISCARD)) {
4319 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4320 if (!blk_queue_discard(q))
4321 ext4_msg(sb, KERN_WARNING,
4322 "mounting with \"discard\" option, but "
4323 "the device does not support discard");
4324 }
4325
e294a537
TT		 4326 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4327 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4328 "Opts: %.*s%s%s", descr,
4329 (int) sizeof(sbi->s_es->s_mount_opts),
4330 sbi->s_es->s_mount_opts,
e294a537 4331 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4332
66e61a9e
TT		 4333 if (es->s_error_count)
4334 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4335
efbed4dc
TT		 4336 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4337 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4338 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4339 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4340
d4c402d9 4341 kfree(orig_data);
ac27a0ec
DK		 4342 return 0;
4343
617ba13b 4344cantfind_ext4:
ac27a0ec 4345 if (!silent)
b31e1552 4346 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4347 goto failed_mount;
4348
72ba7450
TT		 4349#ifdef CONFIG_QUOTA
4350failed_mount8:
ebd173be 4351 ext4_unregister_sysfs(sb);
72ba7450 4352#endif
dcf2d804
TM		 4353failed_mount7:
4354 ext4_unregister_li_request(sb);
4355failed_mount6:
f9ae9cf5 4356 ext4_mb_release(sb);
d5e03cbb 4357 if (sbi->s_flex_groups)
b93b41d4 4358 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4359 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4360 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4361 percpu_counter_destroy(&sbi->s_dirs_counter);
4362 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4363failed_mount5:
f9ae9cf5
TT		 4364 ext4_ext_release(sb);
4365 ext4_release_system_zone(sb);
4366failed_mount4a:
94bf608a 4367 dput(sb->s_root);
32a9bb57 4368 sb->s_root = NULL;
94bf608a 4369failed_mount4:
b31e1552 4370 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4371 if (EXT4_SB(sb)->rsv_conversion_wq)
4372 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4373failed_mount_wq:
dec214d0
TE		 4374 if (sbi->s_ea_inode_cache) {
4375 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4376 sbi->s_ea_inode_cache = NULL;
4377 }
47387409
TE		 4378 if (sbi->s_ea_block_cache) {
4379 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4380 sbi->s_ea_block_cache = NULL;
82939d79 4381 }
0390131b
FM		 4382 if (sbi->s_journal) {
4383 jbd2_journal_destroy(sbi->s_journal);
4384 sbi->s_journal = NULL;
4385 }
50460fe8 4386failed_mount3a:
d3922a77 4387 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4388failed_mount3:
9105bb14 4389 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4390 if (sbi->s_mmp_tsk)
4391 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4392failed_mount2:
4393 for (i = 0; i < db_count; i++)
4394 brelse(sbi->s_group_desc[i]);
b93b41d4 4395 kvfree(sbi->s_group_desc);
ac27a0ec 4396failed_mount:
0441984a
DW		 4397 if (sbi->s_chksum_driver)
4398 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4399#ifdef CONFIG_QUOTA
a2d4a646 4400 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4401 kfree(sbi->s_qf_names[i]);
4402#endif
617ba13b 4403 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4404 brelse(bh);
4405out_fail:
4406 sb->s_fs_info = NULL;
f6830165 4407 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4408out_free_base:
ac27a0ec 4409 kfree(sbi);
d4c402d9 4410 kfree(orig_data);
5e405595 4411 fs_put_dax(dax_dev);
07aa2ea1 4412 return err ? err : ret;
ac27a0ec
DK		 4413}
4414
4415/*
4416 * Setup any per-fs journal parameters now. We'll do this both on
4417 * initial mount, once the journal has been initialised but before we've
4418 * done any recovery; and again on any subsequent remount.
4419 */
617ba13b 4420static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4421{
617ba13b 4422 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4423
30773840
TT		 4424 journal->j_commit_interval = sbi->s_commit_interval;
4425 journal->j_min_batch_time = sbi->s_min_batch_time;
4426 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4427
a931da6a 4428 write_lock(&journal->j_state_lock);
ac27a0ec 4429 if (test_opt(sb, BARRIER))
dab291af 4430 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4431 else
dab291af 4432 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4433 if (test_opt(sb, DATA_ERR_ABORT))
4434 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4435 else
4436 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4437 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4438}
4439
c6cb7e77
EW		 4440static struct inode *ext4_get_journal_inode(struct super_block *sb,
4441 unsigned int journal_inum)
ac27a0ec
DK		 4442{
4443 struct inode *journal_inode;
ac27a0ec 4444
c6cb7e77
EW		 4445 /*
4446 * Test for the existence of a valid inode on disk. Bad things
4447 * happen if we iget() an unused inode, as the subsequent iput()
4448 * will try to delete it.
4449 */
1d1fe1ee
DH		 4450 journal_inode = ext4_iget(sb, journal_inum);
4451 if (IS_ERR(journal_inode)) {
b31e1552 4452 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4453 return NULL;
4454 }
4455 if (!journal_inode->i_nlink) {
4456 make_bad_inode(journal_inode);
4457 iput(journal_inode);
b31e1552 4458 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4459 return NULL;
4460 }
4461
e5f8eab8 4462 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4463 journal_inode, journal_inode->i_size);
1d1fe1ee 4464 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4465 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4466 iput(journal_inode);
4467 return NULL;
4468 }
c6cb7e77
EW		 4469 return journal_inode;
4470}
4471
4472static journal_t *ext4_get_journal(struct super_block *sb,
4473 unsigned int journal_inum)
4474{
4475 struct inode *journal_inode;
4476 journal_t *journal;
4477
4478 BUG_ON(!ext4_has_feature_journal(sb));
4479
4480 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4481 if (!journal_inode)
4482 return NULL;
ac27a0ec 4483
dab291af 4484 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4485 if (!journal) {
b31e1552 4486 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4487 iput(journal_inode);
4488 return NULL;
4489 }
4490 journal->j_private = sb;
617ba13b 4491 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4492 return journal;
4493}
4494
617ba13b 4495static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4496 dev_t j_dev)
4497{
2b2d6d01 4498 struct buffer_head *bh;
ac27a0ec 4499 journal_t *journal;
617ba13b
MC		 4500 ext4_fsblk_t start;
4501 ext4_fsblk_t len;
ac27a0ec 4502 int hblock, blocksize;
617ba13b 4503 ext4_fsblk_t sb_block;
ac27a0ec 4504 unsigned long offset;
2b2d6d01 4505 struct ext4_super_block *es;
ac27a0ec
DK		 4506 struct block_device *bdev;
4507
e2b911c5 4508 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4509
b31e1552 4510 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4511 if (bdev == NULL)
4512 return NULL;
4513
ac27a0ec 4514 blocksize = sb->s_blocksize;
e1defc4f 4515 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4516 if (blocksize < hblock) {
b31e1552
ES		 4517 ext4_msg(sb, KERN_ERR,
4518 "blocksize too small for journal device");
ac27a0ec
DK		 4519 goto out_bdev;
4520 }
4521
617ba13b
MC		 4522 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4523 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4524 set_blocksize(bdev, blocksize);
4525 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4526 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4527 "external journal");
ac27a0ec
DK		 4528 goto out_bdev;
4529 }
4530
2716b802 4531 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4532 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4533 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4534 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4535 ext4_msg(sb, KERN_ERR, "external journal has "
4536 "bad superblock");
ac27a0ec
DK		 4537 brelse(bh);
4538 goto out_bdev;
4539 }
4540
df4763be
DW		 4541 if ((le32_to_cpu(es->s_feature_ro_compat) &
4542 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4543 es->s_checksum != ext4_superblock_csum(sb, es)) {
4544 ext4_msg(sb, KERN_ERR, "external journal has "
4545 "corrupt superblock");
4546 brelse(bh);
4547 goto out_bdev;
4548 }
4549
617ba13b 4550 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4551 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4552 brelse(bh);
4553 goto out_bdev;
4554 }
4555
bd81d8ee 4556 len = ext4_blocks_count(es);
ac27a0ec
DK		 4557 start = sb_block + 1;
4558 brelse(bh); /* we're done with the superblock */
4559
dab291af 4560 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4561 start, len, blocksize);
4562 if (!journal) {
b31e1552 4563 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4564 goto out_bdev;
4565 }
4566 journal->j_private = sb;
dfec8a14 4567 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4568 wait_on_buffer(journal->j_sb_buffer);
4569 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4570 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4571 goto out_journal;
4572 }
4573 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4574 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4575 "user (unsupported) - %d",
ac27a0ec
DK		 4576 be32_to_cpu(journal->j_superblock->s_nr_users));
4577 goto out_journal;
4578 }
617ba13b
MC		 4579 EXT4_SB(sb)->journal_bdev = bdev;
4580 ext4_init_journal_params(sb, journal);
ac27a0ec 4581 return journal;
0b8e58a1 4582
ac27a0ec 4583out_journal:
dab291af 4584 jbd2_journal_destroy(journal);
ac27a0ec 4585out_bdev:
617ba13b 4586 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4587 return NULL;
4588}
4589
617ba13b
MC		 4590static int ext4_load_journal(struct super_block *sb,
4591 struct ext4_super_block *es,
ac27a0ec
DK		 4592 unsigned long journal_devnum)
4593{
4594 journal_t *journal;
4595 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4596 dev_t journal_dev;
4597 int err = 0;
4598 int really_read_only;
4599
e2b911c5 4600 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4601
ac27a0ec
DK		 4602 if (journal_devnum &&
4603 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4604 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4605 "numbers have changed");
ac27a0ec
DK		 4606 journal_dev = new_decode_dev(journal_devnum);
4607 } else
4608 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4609
4610 really_read_only = bdev_read_only(sb->s_bdev);
4611
4612 /*
4613 * Are we loading a blank journal or performing recovery after a
4614 * crash? For recovery, we need to check in advance whether we
4615 * can get read-write access to the device.
4616 */
e2b911c5 4617 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 4618 if (sb_rdonly(sb)) {
b31e1552
ES		 4619 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4620 "required on readonly filesystem");
ac27a0ec 4621 if (really_read_only) {
b31e1552 4622 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 4623 "unavailable, cannot proceed "
4624 "(try mounting with noload)");
ac27a0ec
DK		 4625 return -EROFS;
4626 }
b31e1552
ES		 4627 ext4_msg(sb, KERN_INFO, "write access will "
4628 "be enabled during recovery");
ac27a0ec
DK		 4629 }
4630 }
4631
4632 if (journal_inum && journal_dev) {
b31e1552
ES		 4633 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4634 "and inode journals!");
ac27a0ec
DK		 4635 return -EINVAL;
4636 }
4637
4638 if (journal_inum) {
617ba13b 4639 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4640 return -EINVAL;
4641 } else {
617ba13b 4642 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4643 return -EINVAL;
4644 }
4645
90576c0b 4646 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4647 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4648
e2b911c5 4649 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4650 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4651 if (!err) {
4652 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4653 if (save)
4654 memcpy(save, ((char *) es) +
4655 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4656 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4657 if (save)
4658 memcpy(((char *) es) + EXT4_S_ERR_START,
4659 save, EXT4_S_ERR_LEN);
4660 kfree(save);
4661 }
ac27a0ec
DK		 4662
4663 if (err) {
b31e1552 4664 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4665 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4666 return err;
4667 }
4668
617ba13b
MC		 4669 EXT4_SB(sb)->s_journal = journal;
4670 ext4_clear_journal_err(sb, es);
ac27a0ec 4671
c41303ce 4672 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4673 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4674 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4675
4676 /* Make sure we flush the recovery flag to disk. */
e2d67052 4677 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4678 }
4679
4680 return 0;
4681}
4682
e2d67052 4683static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4684{
e2d67052 4685 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4686 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4687 int error = 0;
ac27a0ec 4688
bdfe0cbd 4689 if (!sbh || block_device_ejected(sb))
c4be0c1d 4690 return error;
71290b36
TT		 4691 /*
4692 * If the file system is mounted read-only, don't update the
4693 * superblock write time. This avoids updating the superblock
4694 * write time when we are mounting the root file system
4695 * read/only but we need to replay the journal; at that point,
4696 * for people who are east of GMT and who make their clock
4697 * tick in localtime for Windows bug-for-bug compatibility,
4698 * the clock is set in the future, and this will cause e2fsck
4699 * to complain and force a full file system check.
4700 */
1751e8a6 4701 if (!(sb->s_flags & SB_RDONLY))
71290b36 4702 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4703 if (sb->s_bdev->bd_part)
4704 es->s_kbytes_written =
4705 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4706 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4707 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4708 else
4709 es->s_kbytes_written =
4710 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4711 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4712 ext4_free_blocks_count_set(es,
57042651
TT		 4713 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4714 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4715 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4716 es->s_free_inodes_count =
4717 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4718 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4719 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4720 ext4_superblock_csum_set(sb);
1566a48a
TT		 4721 if (sync)
4722 lock_buffer(sbh);
4743f839
PKS		 4723 if (buffer_write_io_error(sbh)) {
4724 /*
4725 * Oh, dear. A previous attempt to write the
4726 * superblock failed. This could happen because the
4727 * USB device was yanked out. Or it could happen to
4728 * be a transient write error and maybe the block will
4729 * be remapped. Nothing we can do but to retry the
4730 * write and hope for the best.
4731 */
4732 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4733 "superblock detected");
4734 clear_buffer_write_io_error(sbh);
4735 set_buffer_uptodate(sbh);
4736 }
ac27a0ec 4737 mark_buffer_dirty(sbh);
914258bf 4738 if (sync) {
1566a48a 4739 unlock_buffer(sbh);
564bc402 4740 error = __sync_dirty_buffer(sbh,
00473374 4741 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c4be0c1d
TS		 4742 if (error)
4743 return error;
4744
4745 error = buffer_write_io_error(sbh);
4746 if (error) {
b31e1552
ES		 4747 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4748 "superblock");
914258bf
TT		 4749 clear_buffer_write_io_error(sbh);
4750 set_buffer_uptodate(sbh);
4751 }
4752 }
c4be0c1d 4753 return error;
ac27a0ec
DK		 4754}
4755
ac27a0ec
DK		 4756/*
4757 * Have we just finished recovery? If so, and if we are mounting (or
4758 * remounting) the filesystem readonly, then we will end up with a
4759 * consistent fs on disk. Record that fact.
4760 */
2b2d6d01
TT		 4761static void ext4_mark_recovery_complete(struct super_block *sb,
4762 struct ext4_super_block *es)
ac27a0ec 4763{
617ba13b 4764 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4765
e2b911c5 4766 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4767 BUG_ON(journal != NULL);
4768 return;
4769 }
dab291af 4770 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4771 if (jbd2_journal_flush(journal) < 0)
4772 goto out;
4773
bc98a42c 4774 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 4775 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4776 ext4_commit_super(sb, 1);
ac27a0ec 4777 }
7ffe1ea8
HK		 4778
4779out:
dab291af 4780 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4781}
4782
4783/*
4784 * If we are mounting (or read-write remounting) a filesystem whose journal
4785 * has recorded an error from a previous lifetime, move that error to the
4786 * main filesystem now.
4787 */
2b2d6d01
TT		 4788static void ext4_clear_journal_err(struct super_block *sb,
4789 struct ext4_super_block *es)
ac27a0ec
DK		 4790{
4791 journal_t *journal;
4792 int j_errno;
4793 const char *errstr;
4794
e2b911c5 4795 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4796
617ba13b 4797 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4798
4799 /*
4800 * Now check for any error status which may have been recorded in the
617ba13b 4801 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4802 */
4803
dab291af 4804 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4805 if (j_errno) {
4806 char nbuf[16];
4807
617ba13b 4808 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4809 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4810 "from previous mount: %s", errstr);
12062ddd 4811 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4812
617ba13b
MC		 4813 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4814 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4815 ext4_commit_super(sb, 1);
ac27a0ec 4816
dab291af 4817 jbd2_journal_clear_err(journal);
d796c52e 4818 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4819 }
4820}
4821
4822/*
4823 * Force the running and committing transactions to commit,
4824 * and wait on the commit.
4825 */
617ba13b 4826int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4827{
4828 journal_t *journal;
ac27a0ec 4829
bc98a42c 4830 if (sb_rdonly(sb))
ac27a0ec
DK		 4831 return 0;
4832
617ba13b 4833 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4834 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4835}
4836
617ba13b 4837static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4838{
14ce0cb4 4839 int ret = 0;
9eddacf9 4840 tid_t target;
06a407f1 4841 bool needs_barrier = false;
8d5d02e6 4842 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4843
49598e04 4844 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 4845 return 0;
4846
9bffad1e 4847 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4848 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4849 /*
4850 * Writeback quota in non-journalled quota case - journalled quota has
4851 * no dirty dquots
4852 */
4853 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4854 /*
4855 * Data writeback is possible w/o journal transaction, so barrier must
4856 * being sent at the end of the function. But we can skip it if
4857 * transaction_commit will do it for us.
4858 */
bda32530
TT		 4859 if (sbi->s_journal) {
4860 target = jbd2_get_latest_transaction(sbi->s_journal);
4861 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4862 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4863 needs_barrier = true;
4864
4865 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4866 if (wait)
4867 ret = jbd2_log_wait_commit(sbi->s_journal,
4868 target);
4869 }
4870 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4871 needs_barrier = true;
06a407f1
DM		 4872 if (needs_barrier) {
4873 int err;
4874 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4875 if (!ret)
4876 ret = err;
0390131b 4877 }
06a407f1
DM		 4878
4879 return ret;
4880}
4881
ac27a0ec
DK		 4882/*
4883 * LVM calls this function before a (read-only) snapshot is created. This
4884 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4885 *
4886 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4887 * state independently. It relies on upper layer to stop all data & metadata
4888 * modifications.
ac27a0ec 4889 */
c4be0c1d 4890static int ext4_freeze(struct super_block *sb)
ac27a0ec 4891{
c4be0c1d
TS		 4892 int error = 0;
4893 journal_t *journal;
ac27a0ec 4894
bc98a42c 4895 if (sb_rdonly(sb))
9ca92389 4896 return 0;
ac27a0ec 4897
9ca92389 4898 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4899
bb044576
TT		 4900 if (journal) {
4901 /* Now we set up the journal barrier. */
4902 jbd2_journal_lock_updates(journal);
ac27a0ec 4903
bb044576
TT		 4904 /*
4905 * Don't clear the needs_recovery flag if we failed to
4906 * flush the journal.
4907 */
4908 error = jbd2_journal_flush(journal);
4909 if (error < 0)
4910 goto out;
c642dc9e
ES		 4911
4912 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4913 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4914 }
9ca92389 4915
9ca92389 4916 error = ext4_commit_super(sb, 1);
6b0310fb 4917out:
bb044576
TT		 4918 if (journal)
4919 /* we rely on upper layer to stop further updates */
4920 jbd2_journal_unlock_updates(journal);
6b0310fb 4921 return error;
ac27a0ec
DK		 4922}
4923
4924/*
4925 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4926 * flag here, even though the filesystem is not technically dirty yet.
4927 */
c4be0c1d 4928static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4929{
bc98a42c 4930 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 4931 return 0;
4932
c642dc9e
ES		 4933 if (EXT4_SB(sb)->s_journal) {
4934 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4935 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4936 }
4937
9ca92389 4938 ext4_commit_super(sb, 1);
c4be0c1d 4939 return 0;
ac27a0ec
DK		 4940}
4941
673c6100
TT		 4942/*
4943 * Structure to save mount options for ext4_remount's benefit
4944 */
4945struct ext4_mount_options {
4946 unsigned long s_mount_opt;
a2595b8a 4947 unsigned long s_mount_opt2;
08cefc7a
EB		 4948 kuid_t s_resuid;
4949 kgid_t s_resgid;
673c6100
TT		 4950 unsigned long s_commit_interval;
4951 u32 s_min_batch_time, s_max_batch_time;
4952#ifdef CONFIG_QUOTA
4953 int s_jquota_fmt;
a2d4a646 4954 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4955#endif
4956};
4957
2b2d6d01 4958static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4959{
2b2d6d01 4960 struct ext4_super_block *es;
617ba13b 4961 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4962 unsigned long old_sb_flags;
617ba13b 4963 struct ext4_mount_options old_opts;
c79d967d 4964 int enable_quota = 0;
8a266467 4965 ext4_group_t g;
b3881f74 4966 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4967 int err = 0;
ac27a0ec 4968#ifdef CONFIG_QUOTA
03dafb5f 4969 int i, j;
ac27a0ec 4970#endif
d4c402d9 4971 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4972
4973 /* Store the original options */
4974 old_sb_flags = sb->s_flags;
4975 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4976 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4977 old_opts.s_resuid = sbi->s_resuid;
4978 old_opts.s_resgid = sbi->s_resgid;
4979 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4980 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4981 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4982#ifdef CONFIG_QUOTA
4983 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4984 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4985 if (sbi->s_qf_names[i]) {
4986 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4987 GFP_KERNEL);
4988 if (!old_opts.s_qf_names[i]) {
4989 for (j = 0; j < i; j++)
4990 kfree(old_opts.s_qf_names[j]);
3e36a163 4991 kfree(orig_data);
03dafb5f
CG		 4992 return -ENOMEM;
4993 }
4994 } else
4995 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4996#endif
b3881f74
TT		 4997 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4998 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4999
661aa520 5000 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5001 err = -EINVAL;
5002 goto restore_opts;
5003 }
5004
6b992ff2 5005 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5006 test_opt(sb, JOURNAL_CHECKSUM)) {
5007 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5008 "during remount not supported; ignoring");
5009 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5010 }
5011
6ae6514b
PS		 5012 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5013 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5014 ext4_msg(sb, KERN_ERR, "can't mount with "
5015 "both data=journal and delalloc");
5016 err = -EINVAL;
5017 goto restore_opts;
5018 }
5019 if (test_opt(sb, DIOREAD_NOLOCK)) {
5020 ext4_msg(sb, KERN_ERR, "can't mount with "
5021 "both data=journal and dioread_nolock");
5022 err = -EINVAL;
5023 goto restore_opts;
5024 }
923ae0ff
RZ		 5025 if (test_opt(sb, DAX)) {
5026 ext4_msg(sb, KERN_ERR, "can't mount with "
5027 "both data=journal and dax");
5028 err = -EINVAL;
5029 goto restore_opts;
5030 }
ab04df78
JK		 5031 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5032 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5033 ext4_msg(sb, KERN_ERR, "can't mount with "
5034 "journal_async_commit in data=ordered mode");
5035 err = -EINVAL;
5036 goto restore_opts;
5037 }
923ae0ff
RZ		 5038 }
5039
cdb7ee4c
TE		 5040 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5041 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5042 err = -EINVAL;
5043 goto restore_opts;
5044 }
5045
923ae0ff
RZ		 5046 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5047 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5048 "dax flag with busy inodes while remounting");
5049 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 5050 }
5051
4ab2f15b 5052 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 5053 ext4_abort(sb, "Abort forced by user");
ac27a0ec 5054
1751e8a6
LT		 5055 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5056 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5057
5058 es = sbi->s_es;
5059
b3881f74 5060 if (sbi->s_journal) {
0390131b 5061 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5062 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5063 }
ac27a0ec 5064
1751e8a6
LT		 5065 if (*flags & SB_LAZYTIME)
5066 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5067
1751e8a6 5068 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5069 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5070 err = -EROFS;
5071 goto restore_opts;
5072 }
5073
1751e8a6 5074 if (*flags & SB_RDONLY) {
38c03b34
TT		 5075 err = sync_filesystem(sb);
5076 if (err < 0)
5077 goto restore_opts;
0f0dd62f
CH		 5078 err = dquot_suspend(sb, -1);
5079 if (err < 0)
c79d967d 5080 goto restore_opts;
c79d967d 5081
ac27a0ec
DK		 5082 /*
5083 * First of all, the unconditional stuff we have to do
5084 * to disable replay of the journal when we next remount
5085 */
1751e8a6 5086 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5087
5088 /*
5089 * OK, test if we are remounting a valid rw partition
5090 * readonly, and if so set the rdonly flag and then
5091 * mark the partition as valid again.
5092 */
617ba13b
MC		 5093 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5094 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5095 es->s_state = cpu_to_le16(sbi->s_mount_state);
5096
a63c9eb2 5097 if (sbi->s_journal)
0390131b 5098 ext4_mark_recovery_complete(sb, es);
ac27a0ec 5099 } else {
a13fb1a4 5100 /* Make sure we can mount this feature set readwrite */
e2b911c5 5101 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5102 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5103 err = -EROFS;
5104 goto restore_opts;
5105 }
8a266467
TT		 5106 /*
5107 * Make sure the group descriptor checksums
0b8e58a1 5108 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5109 */
5110 for (g = 0; g < sbi->s_groups_count; g++) {
5111 struct ext4_group_desc *gdp =
5112 ext4_get_group_desc(sb, g, NULL);
5113
feb0ab32 5114 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5115 ext4_msg(sb, KERN_ERR,
5116 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5117 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5118 le16_to_cpu(gdp->bg_checksum));
6a797d27 5119 err = -EFSBADCRC;
8a266467
TT		 5120 goto restore_opts;
5121 }
5122 }
5123
ead6596b
ES		 5124 /*
5125 * If we have an unprocessed orphan list hanging
5126 * around from a previously readonly bdev mount,
5127 * require a full umount/remount for now.
5128 */
5129 if (es->s_last_orphan) {
b31e1552 5130 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5131 "remount RDWR because of unprocessed "
5132 "orphan inode list. Please "
b31e1552 5133 "umount/remount instead");
ead6596b
ES		 5134 err = -EINVAL;
5135 goto restore_opts;
5136 }
5137
ac27a0ec
DK		 5138 /*
5139 * Mounting a RDONLY partition read-write, so reread
5140 * and store the current valid flag. (It may have
5141 * been changed by e2fsck since we originally mounted
5142 * the partition.)
5143 */
0390131b
FM		 5144 if (sbi->s_journal)
5145 ext4_clear_journal_err(sb, es);
ac27a0ec 5146 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 5147 if (!ext4_setup_super(sb, es, 0))
1751e8a6 5148 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5149 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5150 if (ext4_multi_mount_protect(sb,
5151 le64_to_cpu(es->s_mmp_block))) {
5152 err = -EROFS;
5153 goto restore_opts;
5154 }
c79d967d 5155 enable_quota = 1;
ac27a0ec
DK		 5156 }
5157 }
bfff6873
LC		 5158
5159 /*
5160 * Reinitialize lazy itable initialization thread based on
5161 * current settings
5162 */
bc98a42c 5163 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5164 ext4_unregister_li_request(sb);
5165 else {
5166 ext4_group_t first_not_zeroed;
5167 first_not_zeroed = ext4_has_uninit_itable(sb);
5168 ext4_register_li_request(sb, first_not_zeroed);
5169 }
5170
6fd058f7 5171 ext4_setup_system_zone(sb);
1751e8a6 5172 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY))
e2d67052 5173 ext4_commit_super(sb, 1);
0390131b 5174
ac27a0ec
DK		 5175#ifdef CONFIG_QUOTA
5176 /* Release old quota file names */
a2d4a646 5177 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5178 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5179 if (enable_quota) {
5180 if (sb_any_quota_suspended(sb))
5181 dquot_resume(sb, -1);
e2b911c5 5182 else if (ext4_has_feature_quota(sb)) {
7c319d32 5183 err = ext4_enable_quotas(sb);
07724f98 5184 if (err)
7c319d32 5185 goto restore_opts;
7c319d32
AK		 5186 }
5187 }
ac27a0ec 5188#endif
d4c402d9 5189
1751e8a6 5190 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5191 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5192 kfree(orig_data);
ac27a0ec 5193 return 0;
0b8e58a1 5194
ac27a0ec
DK		 5195restore_opts:
5196 sb->s_flags = old_sb_flags;
5197 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5198 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5199 sbi->s_resuid = old_opts.s_resuid;
5200 sbi->s_resgid = old_opts.s_resgid;
5201 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5202 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5203 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5204#ifdef CONFIG_QUOTA
5205 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5206 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5207 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5208 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5209 }
5210#endif
d4c402d9 5211 kfree(orig_data);
ac27a0ec
DK		 5212 return err;
5213}
5214
689c958c
LX		 5215#ifdef CONFIG_QUOTA
5216static int ext4_statfs_project(struct super_block *sb,
5217 kprojid_t projid, struct kstatfs *buf)
5218{
5219 struct kqid qid;
5220 struct dquot *dquot;
5221 u64 limit;
5222 u64 curblock;
5223
5224 qid = make_kqid_projid(projid);
5225 dquot = dqget(sb, qid);
5226 if (IS_ERR(dquot))
5227 return PTR_ERR(dquot);
7b9ca4c6 5228 spin_lock(&dquot->dq_dqb_lock);
689c958c
LX		 5229
5230 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5231 dquot->dq_dqb.dqb_bsoftlimit :
5232 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5233 if (limit && buf->f_blocks > limit) {
5234 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5235 buf->f_blocks = limit;
5236 buf->f_bfree = buf->f_bavail =
5237 (buf->f_blocks > curblock) ?
5238 (buf->f_blocks - curblock) : 0;
5239 }
5240
5241 limit = dquot->dq_dqb.dqb_isoftlimit ?
5242 dquot->dq_dqb.dqb_isoftlimit :
5243 dquot->dq_dqb.dqb_ihardlimit;
5244 if (limit && buf->f_files > limit) {
5245 buf->f_files = limit;
5246 buf->f_ffree =
5247 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5248 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5249 }
5250
7b9ca4c6 5251 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5252 dqput(dquot);
5253 return 0;
5254}
5255#endif
5256
2b2d6d01 5257static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5258{
5259 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5260 struct ext4_sb_info *sbi = EXT4_SB(sb);
5261 struct ext4_super_block *es = sbi->s_es;
27dd4385 5262 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5263 u64 fsid;
d02a9391 5264 s64 bfree;
27dd4385 5265 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5266
952fc18e
TT		 5267 if (!test_opt(sb, MINIX_DF))
5268 overhead = sbi->s_overhead;
ac27a0ec 5269
617ba13b 5270 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5271 buf->f_bsize = sb->s_blocksize;
b72f78cb 5272 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5273 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5274 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5275 /* prevent underflow in case that few free space is available */
57042651 5276 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5277 buf->f_bavail = buf->f_bfree -
5278 (ext4_r_blocks_count(es) + resv_blocks);
5279 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5280 buf->f_bavail = 0;
5281 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5282 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5283 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5284 fsid = le64_to_cpup((void *)es->s_uuid) ^
5285 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5286 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5287 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5288
689c958c
LX		 5289#ifdef CONFIG_QUOTA
5290 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5291 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5292 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5293#endif
ac27a0ec
DK		 5294 return 0;
5295}
5296
ac27a0ec
DK		 5297
5298#ifdef CONFIG_QUOTA
5299
bc8230ee
JK		 5300/*
5301 * Helper functions so that transaction is started before we acquire dqio_sem
5302 * to keep correct lock ordering of transaction > dqio_sem
5303 */
ac27a0ec
DK		 5304static inline struct inode *dquot_to_inode(struct dquot *dquot)
5305{
4c376dca 5306 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5307}
5308
617ba13b 5309static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5310{
5311 int ret, err;
5312 handle_t *handle;
5313 struct inode *inode;
5314
5315 inode = dquot_to_inode(dquot);
9924a92a 5316 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5317 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5318 if (IS_ERR(handle))
5319 return PTR_ERR(handle);
5320 ret = dquot_commit(dquot);
617ba13b 5321 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5322 if (!ret)
5323 ret = err;
5324 return ret;
5325}
5326
617ba13b 5327static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5328{
5329 int ret, err;
5330 handle_t *handle;
5331
9924a92a 5332 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5333 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5334 if (IS_ERR(handle))
5335 return PTR_ERR(handle);
5336 ret = dquot_acquire(dquot);
617ba13b 5337 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5338 if (!ret)
5339 ret = err;
5340 return ret;
5341}
5342
617ba13b 5343static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5344{
5345 int ret, err;
5346 handle_t *handle;
5347
9924a92a 5348 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5349 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5350 if (IS_ERR(handle)) {
5351 /* Release dquot anyway to avoid endless cycle in dqput() */
5352 dquot_release(dquot);
ac27a0ec 5353 return PTR_ERR(handle);
9c3013e9 5354 }
ac27a0ec 5355 ret = dquot_release(dquot);
617ba13b 5356 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5357 if (!ret)
5358 ret = err;
5359 return ret;
5360}
5361
617ba13b 5362static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5363{
262b4662
JK		 5364 struct super_block *sb = dquot->dq_sb;
5365 struct ext4_sb_info *sbi = EXT4_SB(sb);
5366
2c8be6b2 5367 /* Are we journaling quotas? */
e2b911c5 5368 if (ext4_has_feature_quota(sb) ||
262b4662 5369 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5370 dquot_mark_dquot_dirty(dquot);
617ba13b 5371 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5372 } else {
5373 return dquot_mark_dquot_dirty(dquot);
5374 }
5375}
5376
617ba13b 5377static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5378{
5379 int ret, err;
5380 handle_t *handle;
5381
5382 /* Data block + inode block */
2b0143b5 5383 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5384 if (IS_ERR(handle))
5385 return PTR_ERR(handle);
5386 ret = dquot_commit_info(sb, type);
617ba13b 5387 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5388 if (!ret)
5389 ret = err;
5390 return ret;
5391}
5392
5393/*
5394 * Turn on quotas during mount time - we need to find
5395 * the quota file and such...
5396 */
617ba13b 5397static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5398{
287a8095
CH		 5399 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5400 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5401}
5402
daf647d2
TT		 5403static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5404{
5405 struct ext4_inode_info *ei = EXT4_I(inode);
5406
5407 /* The first argument of lockdep_set_subclass has to be
5408 * *exactly* the same as the argument to init_rwsem() --- in
5409 * this case, in init_once() --- or lockdep gets unhappy
5410 * because the name of the lock is set using the
5411 * stringification of the argument to init_rwsem().
5412 */
5413 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5414 lockdep_set_subclass(&ei->i_data_sem, subclass);
5415}
5416
ac27a0ec
DK		 5417/*
5418 * Standard function to be called on quota_on
5419 */
617ba13b 5420static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5421 const struct path *path)
ac27a0ec
DK		 5422{
5423 int err;
ac27a0ec
DK		 5424
5425 if (!test_opt(sb, QUOTA))
5426 return -EINVAL;
0623543b 5427
ac27a0ec 5428 /* Quotafile not on the same filesystem? */
d8c9584e 5429 if (path->dentry->d_sb != sb)
ac27a0ec 5430 return -EXDEV;
0623543b
JK		 5431 /* Journaling quota? */
5432 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5433 /* Quotafile not in fs root? */
f00c9e44 5434 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5435 ext4_msg(sb, KERN_WARNING,
5436 "Quota file not on filesystem root. "
5437 "Journaled quota will not work");
91389240
JK		 5438 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5439 } else {
5440 /*
5441 * Clear the flag just in case mount options changed since
5442 * last time.
5443 */
5444 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 5445 }
0623543b
JK		 5446
5447 /*
5448 * When we journal data on quota file, we have to flush journal to see
5449 * all updates to the file when we bypass pagecache...
5450 */
0390131b 5451 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5452 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5453 /*
5454 * We don't need to lock updates but journal_flush() could
5455 * otherwise be livelocked...
5456 */
5457 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5458 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5459 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5460 if (err)
7ffe1ea8 5461 return err;
0623543b 5462 }
957153fc 5463
daf647d2
TT		 5464 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5465 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5466 if (err) {
daf647d2
TT		 5467 lockdep_set_quota_inode(path->dentry->d_inode,
5468 I_DATA_SEM_NORMAL);
957153fc
JK		 5469 } else {
5470 struct inode *inode = d_inode(path->dentry);
5471 handle_t *handle;
5472
61a92987
JK		 5473 /*
5474 * Set inode flags to prevent userspace from messing with quota
5475 * files. If this fails, we return success anyway since quotas
5476 * are already enabled and this is not a hard failure.
5477 */
957153fc
JK		 5478 inode_lock(inode);
5479 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5480 if (IS_ERR(handle))
5481 goto unlock_inode;
5482 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5483 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5484 S_NOATIME | S_IMMUTABLE);
5485 ext4_mark_inode_dirty(handle, inode);
5486 ext4_journal_stop(handle);
5487 unlock_inode:
5488 inode_unlock(inode);
5489 }
daf647d2 5490 return err;
ac27a0ec
DK		 5491}
5492
7c319d32
AK		 5493static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5494 unsigned int flags)
5495{
5496 int err;
5497 struct inode *qf_inode;
a2d4a646 5498 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5499 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5500 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5501 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5502 };
5503
e2b911c5 5504 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5505
5506 if (!qf_inums[type])
5507 return -EPERM;
5508
5509 qf_inode = ext4_iget(sb, qf_inums[type]);
5510 if (IS_ERR(qf_inode)) {
5511 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5512 return PTR_ERR(qf_inode);
5513 }
5514
bcb13850
JK		 5515 /* Don't account quota for quota files to avoid recursion */
5516 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5517 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32
AK		 5518 err = dquot_enable(qf_inode, type, format_id, flags);
5519 iput(qf_inode);
daf647d2
TT		 5520 if (err)
5521 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7c319d32
AK		 5522
5523 return err;
5524}
5525
5526/* Enable usage tracking for all quota types. */
5527static int ext4_enable_quotas(struct super_block *sb)
5528{
5529 int type, err = 0;
a2d4a646 5530 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5531 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5532 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5533 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5534 };
49da9392
JK		 5535 bool quota_mopt[EXT4_MAXQUOTAS] = {
5536 test_opt(sb, USRQUOTA),
5537 test_opt(sb, GRPQUOTA),
5538 test_opt(sb, PRJQUOTA),
5539 };
7c319d32 5540
91389240 5541 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 5542 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5543 if (qf_inums[type]) {
5544 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5545 DQUOT_USAGE_ENABLED |
5546 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32 5547 if (err) {
95f1fda4 5548 for (type--; type >= 0; type--)
5549 dquot_quota_off(sb, type);
5550
7c319d32 5551 ext4_warning(sb,
72ba7450
TT		 5552 "Failed to enable quota tracking "
5553 "(type=%d, err=%d). Please run "
5554 "e2fsck to fix.", type, err);
7c319d32
AK		 5555 return err;
5556 }
5557 }
5558 }
5559 return 0;
5560}
5561
ca0e05e4
DM		 5562static int ext4_quota_off(struct super_block *sb, int type)
5563{
21f97697
JK		 5564 struct inode *inode = sb_dqopt(sb)->files[type];
5565 handle_t *handle;
957153fc 5566 int err;
21f97697 5567
87009d86
DM		 5568 /* Force all delayed allocation blocks to be allocated.
5569 * Caller already holds s_umount sem */
5570 if (test_opt(sb, DELALLOC))
ca0e05e4 5571 sync_filesystem(sb);
ca0e05e4 5572
957153fc 5573 if (!inode || !igrab(inode))
0b268590
AG		 5574 goto out;
5575
957153fc 5576 err = dquot_quota_off(sb, type);
964edf66 5577 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 5578 goto out_put;
5579
5580 inode_lock(inode);
61a92987
JK		 5581 /*
5582 * Update modification times of quota files when userspace can
5583 * start looking at them. If we fail, we return success anyway since
5584 * this is not a hard failure and quotas are already disabled.
5585 */
9924a92a 5586 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697 5587 if (IS_ERR(handle))
957153fc
JK		 5588 goto out_unlock;
5589 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5590 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 5591 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5592 ext4_mark_inode_dirty(handle, inode);
5593 ext4_journal_stop(handle);
957153fc
JK		 5594out_unlock:
5595 inode_unlock(inode);
5596out_put:
964edf66 5597 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 5598 iput(inode);
5599 return err;
21f97697 5600out:
ca0e05e4
DM		 5601 return dquot_quota_off(sb, type);
5602}
5603
ac27a0ec
DK		 5604/* Read data from quotafile - avoid pagecache and such because we cannot afford
5605 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5606 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5607 * we don't have to be afraid of races */
617ba13b 5608static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5609 size_t len, loff_t off)
5610{
5611 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5612 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5613 int offset = off & (sb->s_blocksize - 1);
5614 int tocopy;
5615 size_t toread;
5616 struct buffer_head *bh;
5617 loff_t i_size = i_size_read(inode);
5618
5619 if (off > i_size)
5620 return 0;
5621 if (off+len > i_size)
5622 len = i_size-off;
5623 toread = len;
5624 while (toread > 0) {
5625 tocopy = sb->s_blocksize - offset < toread ?
5626 sb->s_blocksize - offset : toread;
1c215028
TT		 5627 bh = ext4_bread(NULL, inode, blk, 0);
5628 if (IS_ERR(bh))
5629 return PTR_ERR(bh);
ac27a0ec
DK		 5630 if (!bh) /* A hole? */
5631 memset(data, 0, tocopy);
5632 else
5633 memcpy(data, bh->b_data+offset, tocopy);
5634 brelse(bh);
5635 offset = 0;
5636 toread -= tocopy;
5637 data += tocopy;
5638 blk++;
5639 }
5640 return len;
5641}
5642
5643/* Write to quotafile (we know the transaction is already started and has
5644 * enough credits) */
617ba13b 5645static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5646 const char *data, size_t len, loff_t off)
5647{
5648 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5649 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5650 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5651 int retries = 0;
ac27a0ec
DK		 5652 struct buffer_head *bh;
5653 handle_t *handle = journal_current_handle();
5654
0390131b 5655 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5656 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5657 " cancelled because transaction is not started",
9c3013e9
JK		 5658 (unsigned long long)off, (unsigned long long)len);
5659 return -EIO;
5660 }
67eeb568
DM		 5661 /*
5662 * Since we account only one data block in transaction credits,
5663 * then it is impossible to cross a block boundary.
5664 */
5665 if (sb->s_blocksize - offset < len) {
5666 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5667 " cancelled because not block aligned",
5668 (unsigned long long)off, (unsigned long long)len);
5669 return -EIO;
5670 }
5671
c5e298ae
TT		 5672 do {
5673 bh = ext4_bread(handle, inode, blk,
5674 EXT4_GET_BLOCKS_CREATE |
5675 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5676 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5677 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5678 if (IS_ERR(bh))
5679 return PTR_ERR(bh);
67eeb568
DM		 5680 if (!bh)
5681 goto out;
5d601255 5682 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5683 err = ext4_journal_get_write_access(handle, bh);
5684 if (err) {
5685 brelse(bh);
1c215028 5686 return err;
ac27a0ec 5687 }
67eeb568
DM		 5688 lock_buffer(bh);
5689 memcpy(bh->b_data+offset, data, len);
5690 flush_dcache_page(bh->b_page);
5691 unlock_buffer(bh);
62d2b5f2 5692 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5693 brelse(bh);
ac27a0ec 5694out:
67eeb568
DM		 5695 if (inode->i_size < off + len) {
5696 i_size_write(inode, off + len);
617ba13b 5697 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5698 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5699 }
67eeb568 5700 return len;
ac27a0ec
DK		 5701}
5702
8f0e8746
TT		 5703static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5704{
5705 const struct quota_format_ops *ops;
5706
5707 if (!sb_has_quota_loaded(sb, qid->type))
5708 return -ESRCH;
5709 ops = sb_dqopt(sb)->ops[qid->type];
5710 if (!ops || !ops->get_next_id)
5711 return -ENOSYS;
5712 return dquot_get_next_id(sb, qid);
5713}
ac27a0ec
DK		 5714#endif
5715
152a0836
AV		 5716static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5717 const char *dev_name, void *data)
ac27a0ec 5718{
152a0836 5719 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5720}
5721
c290ea01 5722#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5723static inline void register_as_ext2(void)
5724{
5725 int err = register_filesystem(&ext2_fs_type);
5726 if (err)
5727 printk(KERN_WARNING
5728 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5729}
5730
5731static inline void unregister_as_ext2(void)
5732{
5733 unregister_filesystem(&ext2_fs_type);
5734}
2035e776
TT		 5735
5736static inline int ext2_feature_set_ok(struct super_block *sb)
5737{
e2b911c5 5738 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 5739 return 0;
bc98a42c 5740 if (sb_rdonly(sb))
2035e776 5741 return 1;
e2b911c5 5742 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5743 return 0;
5744 return 1;
5745}
24b58424
TT		 5746#else
5747static inline void register_as_ext2(void) { }
5748static inline void unregister_as_ext2(void) { }
2035e776 5749static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5750#endif
5751
24b58424
TT		 5752static inline void register_as_ext3(void)
5753{
5754 int err = register_filesystem(&ext3_fs_type);
5755 if (err)
5756 printk(KERN_WARNING
5757 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5758}
5759
5760static inline void unregister_as_ext3(void)
5761{
5762 unregister_filesystem(&ext3_fs_type);
5763}
2035e776
TT		 5764
5765static inline int ext3_feature_set_ok(struct super_block *sb)
5766{
e2b911c5 5767 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5768 return 0;
e2b911c5 5769 if (!ext4_has_feature_journal(sb))
2035e776 5770 return 0;
bc98a42c 5771 if (sb_rdonly(sb))
2035e776 5772 return 1;
e2b911c5 5773 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5774 return 0;
5775 return 1;
5776}
24b58424 5777
03010a33
TT		 5778static struct file_system_type ext4_fs_type = {
5779 .owner = THIS_MODULE,
5780 .name = "ext4",
152a0836 5781 .mount = ext4_mount,
03010a33
TT		 5782 .kill_sb = kill_block_super,
5783 .fs_flags = FS_REQUIRES_DEV,
5784};
7f78e035 5785MODULE_ALIAS_FS("ext4");
03010a33 5786
e9e3bcec
ES		 5787/* Shared across all ext4 file systems */
5788wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 5789
5dabfc78 5790static int __init ext4_init_fs(void)
ac27a0ec 5791{
e9e3bcec 5792 int i, err;
c9de560d 5793
e294a537 5794 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5795 ext4_li_info = NULL;
5796 mutex_init(&ext4_li_mtx);
5797
9a4c8019 5798 /* Build-time check for flags consistency */
12e9b892 5799 ext4_check_flag_values();
e9e3bcec 5800
e142d052 5801 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 5802 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 5803
51865fda 5804 err = ext4_init_es();
6fd058f7
TT		 5805 if (err)
5806 return err;
51865fda
ZL		 5807
5808 err = ext4_init_pageio();
5809 if (err)
b5799018 5810 goto out5;
51865fda 5811
5dabfc78 5812 err = ext4_init_system_zone();
bd2d0210 5813 if (err)
b5799018 5814 goto out4;
857ac889 5815
b5799018 5816 err = ext4_init_sysfs();
dd68314c 5817 if (err)
b5799018 5818 goto out3;
857ac889 5819
5dabfc78 5820 err = ext4_init_mballoc();
c9de560d
AT		 5821 if (err)
5822 goto out2;
ac27a0ec
DK		 5823 err = init_inodecache();
5824 if (err)
5825 goto out1;
24b58424 5826 register_as_ext3();
2035e776 5827 register_as_ext2();
03010a33 5828 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5829 if (err)
5830 goto out;
bfff6873 5831
ac27a0ec
DK		 5832 return 0;
5833out:
24b58424
TT		 5834 unregister_as_ext2();
5835 unregister_as_ext3();
ac27a0ec
DK		 5836 destroy_inodecache();
5837out1:
5dabfc78 5838 ext4_exit_mballoc();
9c191f70 5839out2:
b5799018
TT		 5840 ext4_exit_sysfs();
5841out3:
5dabfc78 5842 ext4_exit_system_zone();
b5799018 5843out4:
5dabfc78 5844 ext4_exit_pageio();
b5799018 5845out5:
51865fda
ZL		 5846 ext4_exit_es();
5847
ac27a0ec
DK		 5848 return err;
5849}
5850
5dabfc78 5851static void __exit ext4_exit_fs(void)
ac27a0ec 5852{
bfff6873 5853 ext4_destroy_lazyinit_thread();
24b58424
TT		 5854 unregister_as_ext2();
5855 unregister_as_ext3();
03010a33 5856 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5857 destroy_inodecache();
5dabfc78 5858 ext4_exit_mballoc();
b5799018 5859 ext4_exit_sysfs();
5dabfc78
TT		 5860 ext4_exit_system_zone();
5861 ext4_exit_pageio();
dd12ed14 5862 ext4_exit_es();
ac27a0ec
DK		 5863}
5864
5865MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5866MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5867MODULE_LICENSE("GPL");
5dabfc78
TT		 5868module_init(ext4_init_fs)
5869module_exit(ext4_exit_fs)
Ubuntu Hirsute Linux kernel mirror