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ext4: fix mount failure with quota configured as module
[mirror_ubuntu-bionic-kernel.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
66114cad 27#include <linux/backing-dev.h>
ac27a0ec 28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
3197ebdb 37#include <linux/ctype.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
ef510424 40#include <linux/dax.h>
7abc52c2 41#include <linux/cleancache.h>
7c0f6ba6 42#include <linux/uaccess.h>
78a8da10 43#include <linux/user_namespace.h>
ac27a0ec 44
bfff6873
LC		 45#include <linux/kthread.h>
46#include <linux/freezer.h>
47
3dcf5451 48#include "ext4.h"
4a092d73 49#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 50#include "ext4_jbd2.h"
ac27a0ec
DK		 51#include "xattr.h"
52#include "acl.h"
3661d286 53#include "mballoc.h"
0c9ec4be 54#include "fsmap.h"
ac27a0ec 55
9bffad1e
TT		 56#define CREATE_TRACE_POINTS
57#include <trace/events/ext4.h>
58
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
e294a537 61static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 72static int ext4_remount(struct super_block *sb, int *flags, char *data);
73static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 74static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 75static int ext4_freeze(struct super_block *sb);
152a0836
AV		 76static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
2035e776
TT		 78static inline int ext2_feature_set_ok(struct super_block *sb);
79static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 80static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 81static void ext4_destroy_lazyinit_thread(void);
82static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 83static void ext4_clear_request_list(void);
c6cb7e77
EW		 84static struct inode *ext4_get_journal_inode(struct super_block *sb,
85 unsigned int journal_inum);
ac27a0ec 86
e74031fd
JK		 87/*
88 * Lock ordering
89 *
90 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
91 * i_mmap_rwsem (inode->i_mmap_rwsem)!
92 *
93 * page fault path:
94 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
95 * page lock -> i_data_sem (rw)
96 *
97 * buffered write path:
98 * sb_start_write -> i_mutex -> mmap_sem
99 * sb_start_write -> i_mutex -> transaction start -> page lock ->
100 * i_data_sem (rw)
101 *
102 * truncate:
103 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
104 * i_mmap_rwsem (w) -> page lock
105 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
106 * transaction start -> i_data_sem (rw)
107 *
108 * direct IO:
109 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
110 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
111 * transaction start -> i_data_sem (rw)
112 *
113 * writepages:
114 * transaction start -> page lock(s) -> i_data_sem (rw)
115 */
116
34693c38
SF		 117static bool userns_mounts = false;
118module_param(userns_mounts, bool, 0644);
119MODULE_PARM_DESC(userns_mounts, "Allow mounts from unprivileged user namespaces");
120
c290ea01 121#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 122static struct file_system_type ext2_fs_type = {
123 .owner = THIS_MODULE,
124 .name = "ext2",
125 .mount = ext4_mount,
126 .kill_sb = kill_block_super,
78a8da10 127 .fs_flags = FS_REQUIRES_DEV | FS_USERNS_MOUNT,
2035e776 128};
7f78e035 129MODULE_ALIAS_FS("ext2");
fa7614dd 130MODULE_ALIAS("ext2");
2035e776
TT		 131#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
132#else
133#define IS_EXT2_SB(sb) (0)
134#endif
135
136
ba69f9ab
JK		 137static struct file_system_type ext3_fs_type = {
138 .owner = THIS_MODULE,
139 .name = "ext3",
152a0836 140 .mount = ext4_mount,
ba69f9ab 141 .kill_sb = kill_block_super,
78a8da10 142 .fs_flags = FS_REQUIRES_DEV | FS_USERNS_MOUNT,
ba69f9ab 143};
7f78e035 144MODULE_ALIAS_FS("ext3");
fa7614dd 145MODULE_ALIAS("ext3");
ba69f9ab 146#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 147
cf143064
TT		 148/*
149 * This works like sb_bread() except it uses ERR_PTR for error
150 * returns. Currently with sb_bread it's impossible to distinguish
151 * between ENOMEM and EIO situations (since both result in a NULL
152 * return.
153 */
154struct buffer_head *
155ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
156{
157 struct buffer_head *bh = sb_getblk(sb, block);
158
159 if (bh == NULL)
160 return ERR_PTR(-ENOMEM);
161 if (buffer_uptodate(bh))
162 return bh;
163 ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
164 wait_on_buffer(bh);
165 if (buffer_uptodate(bh))
166 return bh;
167 put_bh(bh);
168 return ERR_PTR(-EIO);
169}
170
d25425f8
DW		 171static int ext4_verify_csum_type(struct super_block *sb,
172 struct ext4_super_block *es)
173{
e2b911c5 174 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 175 return 1;
176
177 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
178}
179
a9c47317
DW		 180static __le32 ext4_superblock_csum(struct super_block *sb,
181 struct ext4_super_block *es)
182{
183 struct ext4_sb_info *sbi = EXT4_SB(sb);
184 int offset = offsetof(struct ext4_super_block, s_checksum);
185 __u32 csum;
186
187 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
188
189 return cpu_to_le32(csum);
190}
191
c197855e
SH		 192static int ext4_superblock_csum_verify(struct super_block *sb,
193 struct ext4_super_block *es)
a9c47317 194{
9aa5d32b 195 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 196 return 1;
197
198 return es->s_checksum == ext4_superblock_csum(sb, es);
199}
200
06db49e6 201void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 202{
06db49e6
TT		 203 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
204
9aa5d32b 205 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 206 return;
207
208 es->s_checksum = ext4_superblock_csum(sb, es);
209}
210
9933fc0a
TT		 211void *ext4_kvmalloc(size_t size, gfp_t flags)
212{
213 void *ret;
214
8be04b93 215 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 216 if (!ret)
217 ret = __vmalloc(size, flags, PAGE_KERNEL);
218 return ret;
219}
220
221void *ext4_kvzalloc(size_t size, gfp_t flags)
222{
223 void *ret;
224
8be04b93 225 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 226 if (!ret)
227 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
228 return ret;
229}
230
8fadc143
AR		 231ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
232 struct ext4_group_desc *bg)
bd81d8ee 233{
3a14589c 234 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 235 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 236 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 237}
238
8fadc143
AR		 239ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
240 struct ext4_group_desc *bg)
bd81d8ee 241{
5272f837 242 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 243 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 244 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 245}
246
8fadc143
AR		 247ext4_fsblk_t ext4_inode_table(struct super_block *sb,
248 struct ext4_group_desc *bg)
bd81d8ee 249{
5272f837 250 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 251 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 252 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 253}
254
021b65bb
TT		 255__u32 ext4_free_group_clusters(struct super_block *sb,
256 struct ext4_group_desc *bg)
560671a0
AK		 257{
258 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
259 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 260 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 261}
262
263__u32 ext4_free_inodes_count(struct super_block *sb,
264 struct ext4_group_desc *bg)
265{
266 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
267 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 268 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 269}
270
271__u32 ext4_used_dirs_count(struct super_block *sb,
272 struct ext4_group_desc *bg)
273{
274 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
275 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 276 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 277}
278
279__u32 ext4_itable_unused_count(struct super_block *sb,
280 struct ext4_group_desc *bg)
281{
282 return le16_to_cpu(bg->bg_itable_unused_lo) |
283 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 284 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 285}
286
8fadc143
AR		 287void ext4_block_bitmap_set(struct super_block *sb,
288 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 289{
3a14589c 290 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 291 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
292 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 293}
294
8fadc143
AR		 295void ext4_inode_bitmap_set(struct super_block *sb,
296 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 297{
5272f837 298 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 299 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
300 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 301}
302
8fadc143
AR		 303void ext4_inode_table_set(struct super_block *sb,
304 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 305{
5272f837 306 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 307 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
308 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 309}
310
021b65bb
TT		 311void ext4_free_group_clusters_set(struct super_block *sb,
312 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 313{
314 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
315 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
316 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
317}
318
319void ext4_free_inodes_set(struct super_block *sb,
320 struct ext4_group_desc *bg, __u32 count)
321{
322 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
323 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
324 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
325}
326
327void ext4_used_dirs_set(struct super_block *sb,
328 struct ext4_group_desc *bg, __u32 count)
329{
330 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
331 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
332 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
333}
334
335void ext4_itable_unused_set(struct super_block *sb,
336 struct ext4_group_desc *bg, __u32 count)
337{
338 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
339 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
340 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
341}
342
d3d1faf6 343
1c13d5c0
TT		 344static void __save_error_info(struct super_block *sb, const char *func,
345 unsigned int line)
346{
347 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
348
349 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 350 if (bdev_read_only(sb->s_bdev))
351 return;
1c13d5c0
TT		 352 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
353 es->s_last_error_time = cpu_to_le32(get_seconds());
354 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
355 es->s_last_error_line = cpu_to_le32(line);
356 if (!es->s_first_error_time) {
357 es->s_first_error_time = es->s_last_error_time;
358 strncpy(es->s_first_error_func, func,
359 sizeof(es->s_first_error_func));
360 es->s_first_error_line = cpu_to_le32(line);
361 es->s_first_error_ino = es->s_last_error_ino;
362 es->s_first_error_block = es->s_last_error_block;
363 }
66e61a9e
TT		 364 /*
365 * Start the daily error reporting function if it hasn't been
366 * started already
367 */
368 if (!es->s_error_count)
369 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 370 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 371}
372
373static void save_error_info(struct super_block *sb, const char *func,
374 unsigned int line)
375{
376 __save_error_info(sb, func, line);
377 ext4_commit_super(sb, 1);
378}
379
bdfe0cbd
TT		 380/*
381 * The del_gendisk() function uninitializes the disk-specific data
382 * structures, including the bdi structure, without telling anyone
383 * else. Once this happens, any attempt to call mark_buffer_dirty()
384 * (for example, by ext4_commit_super), will cause a kernel OOPS.
385 * This is a kludge to prevent these oops until we can put in a proper
386 * hook in del_gendisk() to inform the VFS and file system layers.
387 */
388static int block_device_ejected(struct super_block *sb)
389{
390 struct inode *bd_inode = sb->s_bdev->bd_inode;
391 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
392
393 return bdi->dev == NULL;
394}
395
18aadd47
BJ		 396static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
397{
398 struct super_block *sb = journal->j_private;
399 struct ext4_sb_info *sbi = EXT4_SB(sb);
400 int error = is_journal_aborted(journal);
5d3ee208 401 struct ext4_journal_cb_entry *jce;
18aadd47 402
5d3ee208 403 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 404
405 ext4_process_freed_data(sb, txn->t_tid);
406
18aadd47 407 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 408 while (!list_empty(&txn->t_private_list)) {
409 jce = list_entry(txn->t_private_list.next,
410 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 411 list_del_init(&jce->jce_list);
412 spin_unlock(&sbi->s_md_lock);
413 jce->jce_func(sb, jce, error);
414 spin_lock(&sbi->s_md_lock);
415 }
416 spin_unlock(&sbi->s_md_lock);
417}
1c13d5c0 418
c19e6e57
JK		 419static bool system_going_down(void)
420{
421 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
422 || system_state == SYSTEM_RESTART;
423}
424
ac27a0ec
DK		 425/* Deal with the reporting of failure conditions on a filesystem such as
426 * inconsistencies detected or read IO failures.
427 *
428 * On ext2, we can store the error state of the filesystem in the
617ba13b 429 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 430 * write ordering constraints on the superblock which prevent us from
431 * writing it out straight away; and given that the journal is about to
432 * be aborted, we can't rely on the current, or future, transactions to
433 * write out the superblock safely.
434 *
dab291af 435 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 436 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 437 * that error until we've noted it down and cleared it.
438 */
439
617ba13b 440static void ext4_handle_error(struct super_block *sb)
ac27a0ec 441{
bc98a42c 442 if (sb_rdonly(sb))
ac27a0ec
DK		 443 return;
444
2b2d6d01 445 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 446 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 447
4ab2f15b 448 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 449 if (journal)
dab291af 450 jbd2_journal_abort(journal, -EIO);
ac27a0ec 451 }
c19e6e57
JK		 452 /*
453 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
454 * could panic during 'reboot -f' as the underlying device got already
455 * disabled.
456 */
457 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
b31e1552 458 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 459 /*
460 * Make sure updated value of ->s_mount_flags will be visible
461 * before ->s_flags update
462 */
463 smp_wmb();
1751e8a6 464 sb->s_flags |= SB_RDONLY;
c19e6e57 465 } else if (test_opt(sb, ERRORS_PANIC)) {
4327ba52
DJ		 466 if (EXT4_SB(sb)->s_journal &&
467 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
468 return;
617ba13b 469 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 470 sb->s_id);
4327ba52 471 }
ac27a0ec
DK		 472}
473
efbed4dc
TT		 474#define ext4_error_ratelimit(sb) \
475 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
476 "EXT4-fs error")
477
12062ddd 478void __ext4_error(struct super_block *sb, const char *function,
c398eda0 479 unsigned int line, const char *fmt, ...)
ac27a0ec 480{
0ff2ea7d 481 struct va_format vaf;
ac27a0ec
DK		 482 va_list args;
483
0db1ff22
TT		 484 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
485 return;
486
efbed4dc
TT		 487 if (ext4_error_ratelimit(sb)) {
488 va_start(args, fmt);
489 vaf.fmt = fmt;
490 vaf.va = &args;
491 printk(KERN_CRIT
492 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
493 sb->s_id, function, line, current->comm, &vaf);
494 va_end(args);
495 }
f3fc0210 496 save_error_info(sb, function, line);
617ba13b 497 ext4_handle_error(sb);
ac27a0ec
DK		 498}
499
e7c96e8e
JP		 500void __ext4_error_inode(struct inode *inode, const char *function,
501 unsigned int line, ext4_fsblk_t block,
502 const char *fmt, ...)
273df556
FM		 503{
504 va_list args;
f7c21177 505 struct va_format vaf;
1c13d5c0 506 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 507
0db1ff22
TT		 508 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
509 return;
510
1c13d5c0
TT		 511 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
512 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 513 if (ext4_error_ratelimit(inode->i_sb)) {
514 va_start(args, fmt);
515 vaf.fmt = fmt;
516 vaf.va = &args;
517 if (block)
518 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
519 "inode #%lu: block %llu: comm %s: %pV\n",
520 inode->i_sb->s_id, function, line, inode->i_ino,
521 block, current->comm, &vaf);
522 else
523 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
524 "inode #%lu: comm %s: %pV\n",
525 inode->i_sb->s_id, function, line, inode->i_ino,
526 current->comm, &vaf);
527 va_end(args);
528 }
1c13d5c0 529 save_error_info(inode->i_sb, function, line);
273df556
FM		 530 ext4_handle_error(inode->i_sb);
531}
532
e7c96e8e
JP		 533void __ext4_error_file(struct file *file, const char *function,
534 unsigned int line, ext4_fsblk_t block,
535 const char *fmt, ...)
273df556
FM		 536{
537 va_list args;
f7c21177 538 struct va_format vaf;
1c13d5c0 539 struct ext4_super_block *es;
496ad9aa 540 struct inode *inode = file_inode(file);
273df556
FM		 541 char pathname[80], *path;
542
0db1ff22
TT		 543 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
544 return;
545
1c13d5c0
TT		 546 es = EXT4_SB(inode->i_sb)->s_es;
547 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 548 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 549 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 550 if (IS_ERR(path))
551 path = "(unknown)";
552 va_start(args, fmt);
553 vaf.fmt = fmt;
554 vaf.va = &args;
555 if (block)
556 printk(KERN_CRIT
557 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
558 "block %llu: comm %s: path %s: %pV\n",
559 inode->i_sb->s_id, function, line, inode->i_ino,
560 block, current->comm, path, &vaf);
561 else
562 printk(KERN_CRIT
563 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
564 "comm %s: path %s: %pV\n",
565 inode->i_sb->s_id, function, line, inode->i_ino,
566 current->comm, path, &vaf);
567 va_end(args);
568 }
1c13d5c0 569 save_error_info(inode->i_sb, function, line);
273df556
FM		 570 ext4_handle_error(inode->i_sb);
571}
572
722887dd
TT		 573const char *ext4_decode_error(struct super_block *sb, int errno,
574 char nbuf[16])
ac27a0ec
DK		 575{
576 char *errstr = NULL;
577
578 switch (errno) {
6a797d27
DW		 579 case -EFSCORRUPTED:
580 errstr = "Corrupt filesystem";
581 break;
582 case -EFSBADCRC:
583 errstr = "Filesystem failed CRC";
584 break;
ac27a0ec
DK		 585 case -EIO:
586 errstr = "IO failure";
587 break;
588 case -ENOMEM:
589 errstr = "Out of memory";
590 break;
591 case -EROFS:
78f1ddbb
TT		 592 if (!sb || (EXT4_SB(sb)->s_journal &&
593 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 594 errstr = "Journal has aborted";
595 else
596 errstr = "Readonly filesystem";
597 break;
598 default:
599 /* If the caller passed in an extra buffer for unknown
600 * errors, textualise them now. Else we just return
601 * NULL. */
602 if (nbuf) {
603 /* Check for truncated error codes... */
604 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
605 errstr = nbuf;
606 }
607 break;
608 }
609
610 return errstr;
611}
612
617ba13b 613/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 614 * automatically and invokes the appropriate error response. */
615
c398eda0
TT		 616void __ext4_std_error(struct super_block *sb, const char *function,
617 unsigned int line, int errno)
ac27a0ec
DK		 618{
619 char nbuf[16];
620 const char *errstr;
621
0db1ff22
TT		 622 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
623 return;
624
ac27a0ec
DK		 625 /* Special case: if the error is EROFS, and we're not already
626 * inside a transaction, then there's really no point in logging
627 * an error. */
bc98a42c 628 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 629 return;
630
efbed4dc
TT		 631 if (ext4_error_ratelimit(sb)) {
632 errstr = ext4_decode_error(sb, errno, nbuf);
633 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
634 sb->s_id, function, line, errstr);
635 }
ac27a0ec 636
efbed4dc 637 save_error_info(sb, function, line);
617ba13b 638 ext4_handle_error(sb);
ac27a0ec
DK		 639}
640
641/*
617ba13b 642 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 643 * abort function may be used to deal with unrecoverable failures such
644 * as journal IO errors or ENOMEM at a critical moment in log management.
645 *
646 * We unconditionally force the filesystem into an ABORT|READONLY state,
647 * unless the error response on the fs has been set to panic in which
648 * case we take the easy way out and panic immediately.
649 */
650
c67d859e 651void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 652 unsigned int line, const char *fmt, ...)
ac27a0ec 653{
651e1c3b 654 struct va_format vaf;
ac27a0ec
DK		 655 va_list args;
656
0db1ff22
TT		 657 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
658 return;
659
1c13d5c0 660 save_error_info(sb, function, line);
ac27a0ec 661 va_start(args, fmt);
651e1c3b
JP		 662 vaf.fmt = fmt;
663 vaf.va = &args;
664 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
665 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 666 va_end(args);
667
bc98a42c 668 if (sb_rdonly(sb) == 0) {
1c13d5c0 669 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 670 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 671 /*
672 * Make sure updated value of ->s_mount_flags will be visible
673 * before ->s_flags update
674 */
675 smp_wmb();
1751e8a6 676 sb->s_flags |= SB_RDONLY;
1c13d5c0
TT		 677 if (EXT4_SB(sb)->s_journal)
678 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
679 save_error_info(sb, function, line);
680 }
0868878c 681 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
4327ba52
DJ		 682 if (EXT4_SB(sb)->s_journal &&
683 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
684 return;
617ba13b 685 panic("EXT4-fs panic from previous error\n");
4327ba52 686 }
ac27a0ec
DK		 687}
688
e7c96e8e
JP		 689void __ext4_msg(struct super_block *sb,
690 const char *prefix, const char *fmt, ...)
b31e1552 691{
0ff2ea7d 692 struct va_format vaf;
b31e1552
ES		 693 va_list args;
694
efbed4dc
TT		 695 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
696 return;
697
b31e1552 698 va_start(args, fmt);
0ff2ea7d
JP		 699 vaf.fmt = fmt;
700 vaf.va = &args;
701 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 702 va_end(args);
703}
704
b03a2f7e
AD		 705#define ext4_warning_ratelimit(sb) \
706 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
707 "EXT4-fs warning")
708
12062ddd 709void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 710 unsigned int line, const char *fmt, ...)
ac27a0ec 711{
0ff2ea7d 712 struct va_format vaf;
ac27a0ec
DK		 713 va_list args;
714
b03a2f7e 715 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 716 return;
717
ac27a0ec 718 va_start(args, fmt);
0ff2ea7d
JP		 719 vaf.fmt = fmt;
720 vaf.va = &args;
721 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
722 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 723 va_end(args);
724}
725
b03a2f7e
AD		 726void __ext4_warning_inode(const struct inode *inode, const char *function,
727 unsigned int line, const char *fmt, ...)
728{
729 struct va_format vaf;
730 va_list args;
731
732 if (!ext4_warning_ratelimit(inode->i_sb))
733 return;
734
735 va_start(args, fmt);
736 vaf.fmt = fmt;
737 vaf.va = &args;
738 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
739 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
740 function, line, inode->i_ino, current->comm, &vaf);
741 va_end(args);
742}
743
e29136f8
TT		 744void __ext4_grp_locked_error(const char *function, unsigned int line,
745 struct super_block *sb, ext4_group_t grp,
746 unsigned long ino, ext4_fsblk_t block,
747 const char *fmt, ...)
5d1b1b3f
AK		 748__releases(bitlock)
749__acquires(bitlock)
750{
0ff2ea7d 751 struct va_format vaf;
5d1b1b3f
AK		 752 va_list args;
753 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
754
0db1ff22
TT		 755 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
756 return;
757
1c13d5c0
TT		 758 es->s_last_error_ino = cpu_to_le32(ino);
759 es->s_last_error_block = cpu_to_le64(block);
760 __save_error_info(sb, function, line);
0ff2ea7d 761
efbed4dc
TT		 762 if (ext4_error_ratelimit(sb)) {
763 va_start(args, fmt);
764 vaf.fmt = fmt;
765 vaf.va = &args;
766 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
767 sb->s_id, function, line, grp);
768 if (ino)
769 printk(KERN_CONT "inode %lu: ", ino);
770 if (block)
771 printk(KERN_CONT "block %llu:",
772 (unsigned long long) block);
773 printk(KERN_CONT "%pV\n", &vaf);
774 va_end(args);
775 }
5d1b1b3f
AK		 776
777 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 778 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 779 return;
780 }
1c13d5c0 781
5d1b1b3f 782 ext4_unlock_group(sb, grp);
8d24273b 783 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 784 ext4_handle_error(sb);
785 /*
786 * We only get here in the ERRORS_RO case; relocking the group
787 * may be dangerous, but nothing bad will happen since the
788 * filesystem will have already been marked read/only and the
789 * journal has been aborted. We return 1 as a hint to callers
790 * who might what to use the return value from
25985edc 791 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 792 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
793 * aggressively from the ext4 function in question, with a
794 * more appropriate error code.
795 */
796 ext4_lock_group(sb, grp);
797 return;
798}
799
617ba13b 800void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 801{
617ba13b 802 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 803
617ba13b 804 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 805 return;
806
12062ddd 807 ext4_warning(sb,
ac27a0ec
DK		 808 "updating to rev %d because of new feature flag, "
809 "running e2fsck is recommended",
617ba13b 810 EXT4_DYNAMIC_REV);
ac27a0ec 811
617ba13b
MC		 812 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
813 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
814 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 815 /* leave es->s_feature_*compat flags alone */
816 /* es->s_uuid will be set by e2fsck if empty */
817
818 /*
819 * The rest of the superblock fields should be zero, and if not it
820 * means they are likely already in use, so leave them alone. We
821 * can leave it up to e2fsck to clean up any inconsistencies there.
822 */
823}
824
825/*
826 * Open the external journal device
827 */
b31e1552 828static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 829{
830 struct block_device *bdev;
831 char b[BDEVNAME_SIZE];
832
d4d77629 833 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 834 if (IS_ERR(bdev))
835 goto fail;
836 return bdev;
837
838fail:
b31e1552 839 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 840 __bdevname(dev, b), PTR_ERR(bdev));
841 return NULL;
842}
843
844/*
845 * Release the journal device
846 */
4385bab1 847static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 848{
4385bab1 849 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 850}
851
4385bab1 852static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 853{
854 struct block_device *bdev;
ac27a0ec
DK		 855 bdev = sbi->journal_bdev;
856 if (bdev) {
4385bab1 857 ext4_blkdev_put(bdev);
ac27a0ec
DK		 858 sbi->journal_bdev = NULL;
859 }
ac27a0ec
DK		 860}
861
862static inline struct inode *orphan_list_entry(struct list_head *l)
863{
617ba13b 864 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 865}
866
617ba13b 867static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 868{
869 struct list_head *l;
870
b31e1552
ES		 871 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
872 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 873
874 printk(KERN_ERR "sb_info orphan list:\n");
875 list_for_each(l, &sbi->s_orphan) {
876 struct inode *inode = orphan_list_entry(l);
877 printk(KERN_ERR " "
878 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
879 inode->i_sb->s_id, inode->i_ino, inode,
880 inode->i_mode, inode->i_nlink,
881 NEXT_ORPHAN(inode));
882 }
883}
884
957153fc
JK		 885#ifdef CONFIG_QUOTA
886static int ext4_quota_off(struct super_block *sb, int type);
887
888static inline void ext4_quota_off_umount(struct super_block *sb)
889{
890 int type;
891
964edf66
JK		 892 /* Use our quota_off function to clear inode flags etc. */
893 for (type = 0; type < EXT4_MAXQUOTAS; type++)
894 ext4_quota_off(sb, type);
957153fc 895}
74255a2c
TT		 896
897/*
898 * This is a helper function which is used in the mount/remount
899 * codepaths (which holds s_umount) to fetch the quota file name.
900 */
901static inline char *get_qf_name(struct super_block *sb,
902 struct ext4_sb_info *sbi,
903 int type)
904{
905 return rcu_dereference_protected(sbi->s_qf_names[type],
906 lockdep_is_held(&sb->s_umount));
907}
957153fc
JK		 908#else
909static inline void ext4_quota_off_umount(struct super_block *sb)
910{
911}
912#endif
913
2b2d6d01 914static void ext4_put_super(struct super_block *sb)
ac27a0ec 915{
617ba13b
MC		 916 struct ext4_sb_info *sbi = EXT4_SB(sb);
917 struct ext4_super_block *es = sbi->s_es;
97abd7d4 918 int aborted = 0;
ef2cabf7 919 int i, err;
ac27a0ec 920
857ac889 921 ext4_unregister_li_request(sb);
957153fc 922 ext4_quota_off_umount(sb);
e0ccfd95 923
2e8fa54e 924 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 925 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 926
0390131b 927 if (sbi->s_journal) {
97abd7d4 928 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 929 err = jbd2_journal_destroy(sbi->s_journal);
930 sbi->s_journal = NULL;
97abd7d4 931 if ((err < 0) && !aborted)
c67d859e 932 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 933 }
d4edac31 934
ebd173be 935 ext4_unregister_sysfs(sb);
d3922a77 936 ext4_es_unregister_shrinker(sbi);
9105bb14 937 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 938 ext4_release_system_zone(sb);
939 ext4_mb_release(sb);
940 ext4_ext_release(sb);
d4edac31 941
bc98a42c 942 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 943 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 944 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 945 }
bc98a42c 946 if (!sb_rdonly(sb))
a8e25a83
AB		 947 ext4_commit_super(sb, 1);
948
ac27a0ec
DK		 949 for (i = 0; i < sbi->s_gdb_count; i++)
950 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 951 kvfree(sbi->s_group_desc);
952 kvfree(sbi->s_flex_groups);
57042651 953 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 954 percpu_counter_destroy(&sbi->s_freeinodes_counter);
955 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 956 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 957 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 958#ifdef CONFIG_QUOTA
a2d4a646 959 for (i = 0; i < EXT4_MAXQUOTAS; i++)
74255a2c 960 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 961#endif
962
963 /* Debugging code just in case the in-memory inode orphan list
964 * isn't empty. The on-disk one can be non-empty if we've
965 * detected an error and taken the fs readonly, but the
966 * in-memory list had better be clean by this point. */
967 if (!list_empty(&sbi->s_orphan))
968 dump_orphan_list(sb, sbi);
969 J_ASSERT(list_empty(&sbi->s_orphan));
970
89d96a6f 971 sync_blockdev(sb->s_bdev);
f98393a6 972 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 973 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
974 /*
975 * Invalidate the journal device's buffers. We don't want them
976 * floating about in memory - the physical journal device may
977 * hotswapped, and it breaks the `ro-after' testing code.
978 */
979 sync_blockdev(sbi->journal_bdev);
f98393a6 980 invalidate_bdev(sbi->journal_bdev);
617ba13b 981 ext4_blkdev_remove(sbi);
ac27a0ec 982 }
dec214d0
TE		 983 if (sbi->s_ea_inode_cache) {
984 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
985 sbi->s_ea_inode_cache = NULL;
986 }
47387409
TE		 987 if (sbi->s_ea_block_cache) {
988 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
989 sbi->s_ea_block_cache = NULL;
9c191f70 990 }
c5e06d10
JL		 991 if (sbi->s_mmp_tsk)
992 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 993 brelse(sbi->s_sbh);
ac27a0ec 994 sb->s_fs_info = NULL;
3197ebdb
TT		 995 /*
996 * Now that we are completely done shutting down the
997 * superblock, we need to actually destroy the kobject.
998 */
3197ebdb
TT		 999 kobject_put(&sbi->s_kobj);
1000 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1001 if (sbi->s_chksum_driver)
1002 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1003 kfree(sbi->s_blockgroup_lock);
5e405595 1004 fs_put_dax(sbi->s_daxdev);
ac27a0ec 1005 kfree(sbi);
ac27a0ec
DK		 1006}
1007
e18b890b 1008static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1009
1010/*
1011 * Called inside transaction, so use GFP_NOFS
1012 */
617ba13b 1013static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1014{
617ba13b 1015 struct ext4_inode_info *ei;
ac27a0ec 1016
e6b4f8da 1017 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1018 if (!ei)
1019 return NULL;
0b8e58a1 1020
ac27a0ec 1021 ei->vfs_inode.i_version = 1;
202ee5df 1022 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 1023 INIT_LIST_HEAD(&ei->i_prealloc_list);
1024 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1025 ext4_es_init_tree(&ei->i_es_tree);
1026 rwlock_init(&ei->i_es_lock);
edaa53ca 1027 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1028 ei->i_es_all_nr = 0;
edaa53ca 1029 ei->i_es_shk_nr = 0;
dd475925 1030 ei->i_es_shrink_lblk = 0;
d2a17637 1031 ei->i_reserved_data_blocks = 0;
9d0be502 1032 ei->i_da_metadata_calc_len = 0;
7e731bc9 1033 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 1034 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 1035#ifdef CONFIG_QUOTA
1036 ei->i_reserved_quota = 0;
96c7e0d9 1037 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1038#endif
8aefcd55 1039 ei->jinode = NULL;
2e8fa54e 1040 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1041 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1042 ei->i_sync_tid = 0;
1043 ei->i_datasync_tid = 0;
e27f41e1 1044 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1045 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 1046 return &ei->vfs_inode;
1047}
1048
7ff9c073
TT		 1049static int ext4_drop_inode(struct inode *inode)
1050{
1051 int drop = generic_drop_inode(inode);
1052
1053 trace_ext4_drop_inode(inode, drop);
1054 return drop;
1055}
1056
fa0d7e3d
NP		 1057static void ext4_i_callback(struct rcu_head *head)
1058{
1059 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 1060 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1061}
1062
617ba13b 1063static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1064{
9f7dd93d 1065 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1066 ext4_msg(inode->i_sb, KERN_ERR,
1067 "Inode %lu (%p): orphan list check failed!",
1068 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1069 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1070 EXT4_I(inode), sizeof(struct ext4_inode_info),
1071 true);
1072 dump_stack();
1073 }
fa0d7e3d 1074 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1075}
1076
51cc5068 1077static void init_once(void *foo)
ac27a0ec 1078{
617ba13b 1079 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1080
a35afb83 1081 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1082 init_rwsem(&ei->xattr_sem);
0e855ac8 1083 init_rwsem(&ei->i_data_sem);
ea3d7209 1084 init_rwsem(&ei->i_mmap_sem);
a35afb83 1085 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1086}
1087
e67bc2b3 1088static int __init init_inodecache(void)
ac27a0ec 1089{
617ba13b
MC		 1090 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1091 sizeof(struct ext4_inode_info),
ac27a0ec 1092 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 1093 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 1094 init_once);
617ba13b 1095 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1096 return -ENOMEM;
1097 return 0;
1098}
1099
1100static void destroy_inodecache(void)
1101{
8c0a8537
KS		 1102 /*
1103 * Make sure all delayed rcu free inodes are flushed before we
1104 * destroy cache.
1105 */
1106 rcu_barrier();
617ba13b 1107 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1108}
1109
0930fcc1 1110void ext4_clear_inode(struct inode *inode)
ac27a0ec 1111{
0930fcc1 1112 invalidate_inode_buffers(inode);
dbd5768f 1113 clear_inode(inode);
9f754758 1114 dquot_drop(inode);
c2ea3fde 1115 ext4_discard_preallocations(inode);
51865fda 1116 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1117 if (EXT4_I(inode)->jinode) {
1118 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1119 EXT4_I(inode)->jinode);
1120 jbd2_free_inode(EXT4_I(inode)->jinode);
1121 EXT4_I(inode)->jinode = NULL;
1122 }
b7236e21 1123#ifdef CONFIG_EXT4_FS_ENCRYPTION
a7550b30 1124 fscrypt_put_encryption_info(inode, NULL);
b7236e21 1125#endif
ac27a0ec
DK		 1126}
1127
1b961ac0 1128static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1129 u64 ino, u32 generation)
ac27a0ec 1130{
ac27a0ec 1131 struct inode *inode;
ac27a0ec 1132
23b9aab1 1133 /*
ac27a0ec
DK		 1134 * Currently we don't know the generation for parent directory, so
1135 * a generation of 0 means "accept any"
1136 */
23b9aab1 1137 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1138 if (IS_ERR(inode))
1139 return ERR_CAST(inode);
1140 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1141 iput(inode);
1142 return ERR_PTR(-ESTALE);
1143 }
1b961ac0
CH		 1144
1145 return inode;
1146}
1147
1148static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1149 int fh_len, int fh_type)
1b961ac0
CH		 1150{
1151 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1152 ext4_nfs_get_inode);
1153}
1154
1155static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1156 int fh_len, int fh_type)
1b961ac0
CH		 1157{
1158 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1159 ext4_nfs_get_inode);
ac27a0ec
DK		 1160}
1161
76c308d4
TT		 1162static int ext4_nfs_commit_metadata(struct inode *inode)
1163{
1164 struct writeback_control wbc = {
1165 .sync_mode = WB_SYNC_ALL
1166 };
1167
1168 trace_ext4_nfs_commit_metadata(inode);
1169 return ext4_write_inode(inode, &wbc);
1170}
1171
c39a7f84
TO		 1172/*
1173 * Try to release metadata pages (indirect blocks, directories) which are
1174 * mapped via the block device. Since these pages could have journal heads
1175 * which would prevent try_to_free_buffers() from freeing them, we must use
1176 * jbd2 layer's try_to_free_buffers() function to release them.
1177 */
0b8e58a1
AD		 1178static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1179 gfp_t wait)
c39a7f84
TO		 1180{
1181 journal_t *journal = EXT4_SB(sb)->s_journal;
1182
1183 WARN_ON(PageChecked(page));
1184 if (!page_has_buffers(page))
1185 return 0;
1186 if (journal)
1187 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1188 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1189 return try_to_free_buffers(page);
1190}
1191
a7550b30
JK		 1192#ifdef CONFIG_EXT4_FS_ENCRYPTION
1193static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1194{
1195 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1196 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1197}
1198
a7550b30
JK		 1199static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1200 void *fs_data)
1201{
2f8f5e76 1202 handle_t *handle = fs_data;
c1a5d5f6 1203 int res, res2, credits, retries = 0;
2f8f5e76 1204
9ce0151a
EB		 1205 /*
1206 * Encrypting the root directory is not allowed because e2fsck expects
1207 * lost+found to exist and be unencrypted, and encrypting the root
1208 * directory would imply encrypting the lost+found directory as well as
1209 * the filename "lost+found" itself.
1210 */
1211 if (inode->i_ino == EXT4_ROOT_INO)
1212 return -EPERM;
2f8f5e76 1213
7d3e06a8
RZ		 1214 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1215 return -EINVAL;
1216
94840e3c
EB		 1217 res = ext4_convert_inline_data(inode);
1218 if (res)
1219 return res;
1220
2f8f5e76
EB		 1221 /*
1222 * If a journal handle was specified, then the encryption context is
1223 * being set on a new inode via inheritance and is part of a larger
1224 * transaction to create the inode. Otherwise the encryption context is
1225 * being set on an existing inode in its own transaction. Only in the
1226 * latter case should the "retry on ENOSPC" logic be used.
1227 */
a7550b30 1228
2f8f5e76
EB		 1229 if (handle) {
1230 res = ext4_xattr_set_handle(handle, inode,
1231 EXT4_XATTR_INDEX_ENCRYPTION,
1232 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1233 ctx, len, 0);
a7550b30
JK		 1234 if (!res) {
1235 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1236 ext4_clear_inode_state(inode,
1237 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1238 /*
2ee6a576
EB		 1239 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1240 * S_DAX may be disabled
a3caa24b
JK		 1241 */
1242 ext4_set_inode_flags(inode);
a7550b30
JK		 1243 }
1244 return res;
1245 }
1246
b8cb5a54
TE		 1247 res = dquot_initialize(inode);
1248 if (res)
1249 return res;
2f8f5e76 1250retry:
af65207c
TE		 1251 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1252 &credits);
dec214d0
TE		 1253 if (res)
1254 return res;
1255
c1a5d5f6 1256 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1257 if (IS_ERR(handle))
1258 return PTR_ERR(handle);
1259
2f8f5e76
EB		 1260 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1261 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1262 ctx, len, 0);
a7550b30
JK		 1263 if (!res) {
1264 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1265 /*
1266 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1267 * S_DAX may be disabled
1268 */
a3caa24b 1269 ext4_set_inode_flags(inode);
a7550b30
JK		 1270 res = ext4_mark_inode_dirty(handle, inode);
1271 if (res)
1272 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1273 }
1274 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1275
1276 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1277 goto retry;
a7550b30
JK		 1278 if (!res)
1279 res = res2;
1280 return res;
1281}
1282
c250b7dd 1283static bool ext4_dummy_context(struct inode *inode)
a7550b30
JK		 1284{
1285 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1286}
1287
1288static unsigned ext4_max_namelen(struct inode *inode)
1289{
1290 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1291 EXT4_NAME_LEN;
1292}
1293
6f69f0ed 1294static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1295 .key_prefix = "ext4:",
a7550b30 1296 .get_context = ext4_get_context,
a7550b30
JK		 1297 .set_context = ext4_set_context,
1298 .dummy_context = ext4_dummy_context,
a7550b30
JK		 1299 .empty_dir = ext4_empty_dir,
1300 .max_namelen = ext4_max_namelen,
1301};
a7550b30
JK		 1302#endif
1303
ac27a0ec 1304#ifdef CONFIG_QUOTA
d6006186 1305static const char * const quotatypes[] = INITQFNAMES;
689c958c 1306#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1307
617ba13b
MC		 1308static int ext4_write_dquot(struct dquot *dquot);
1309static int ext4_acquire_dquot(struct dquot *dquot);
1310static int ext4_release_dquot(struct dquot *dquot);
1311static int ext4_mark_dquot_dirty(struct dquot *dquot);
1312static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1313static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1314 const struct path *path);
617ba13b
MC		 1315static int ext4_quota_on_mount(struct super_block *sb, int type);
1316static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1317 size_t len, loff_t off);
617ba13b 1318static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1319 const char *data, size_t len, loff_t off);
7c319d32
AK		 1320static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1321 unsigned int flags);
1322static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1323static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1324
96c7e0d9
JK		 1325static struct dquot **ext4_get_dquots(struct inode *inode)
1326{
1327 return EXT4_I(inode)->i_dquot;
1328}
1329
61e225dc 1330static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1331 .get_reserved_space = ext4_get_reserved_space,
1332 .write_dquot = ext4_write_dquot,
1333 .acquire_dquot = ext4_acquire_dquot,
1334 .release_dquot = ext4_release_dquot,
1335 .mark_dirty = ext4_mark_dquot_dirty,
1336 .write_info = ext4_write_info,
1337 .alloc_dquot = dquot_alloc,
1338 .destroy_dquot = dquot_destroy,
1339 .get_projid = ext4_get_projid,
1340 .get_inode_usage = ext4_get_inode_usage,
1341 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1342};
1343
0d54b217 1344static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1345 .quota_on = ext4_quota_on,
ca0e05e4 1346 .quota_off = ext4_quota_off,
287a8095 1347 .quota_sync = dquot_quota_sync,
0a240339 1348 .get_state = dquot_get_state,
287a8095
CH		 1349 .set_info = dquot_set_dqinfo,
1350 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1351 .set_dqblk = dquot_set_dqblk,
1352 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1353};
1354#endif
1355
ee9b6d61 1356static const struct super_operations ext4_sops = {
617ba13b
MC		 1357 .alloc_inode = ext4_alloc_inode,
1358 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1359 .write_inode = ext4_write_inode,
1360 .dirty_inode = ext4_dirty_inode,
7ff9c073 1361 .drop_inode = ext4_drop_inode,
0930fcc1 1362 .evict_inode = ext4_evict_inode,
617ba13b 1363 .put_super = ext4_put_super,
617ba13b 1364 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1365 .freeze_fs = ext4_freeze,
1366 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1367 .statfs = ext4_statfs,
1368 .remount_fs = ext4_remount,
617ba13b 1369 .show_options = ext4_show_options,
ac27a0ec 1370#ifdef CONFIG_QUOTA
617ba13b
MC		 1371 .quota_read = ext4_quota_read,
1372 .quota_write = ext4_quota_write,
96c7e0d9 1373 .get_dquots = ext4_get_dquots,
ac27a0ec 1374#endif
c39a7f84 1375 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1376};
1377
39655164 1378static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1379 .fh_to_dentry = ext4_fh_to_dentry,
1380 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1381 .get_parent = ext4_get_parent,
76c308d4 1382 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1383};
1384
1385enum {
1386 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1387 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1388 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1389 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1390 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1391 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1392 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1393 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1394 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1395 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1396 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1397 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1398 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1449032b 1399 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
670e9875 1400 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1401 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1402 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1403 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1404 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1405 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
ac27a0ec
DK		 1406};
1407
a447c093 1408static const match_table_t tokens = {
ac27a0ec
DK		 1409 {Opt_bsd_df, "bsddf"},
1410 {Opt_minix_df, "minixdf"},
1411 {Opt_grpid, "grpid"},
1412 {Opt_grpid, "bsdgroups"},
1413 {Opt_nogrpid, "nogrpid"},
1414 {Opt_nogrpid, "sysvgroups"},
1415 {Opt_resgid, "resgid=%u"},
1416 {Opt_resuid, "resuid=%u"},
1417 {Opt_sb, "sb=%u"},
1418 {Opt_err_cont, "errors=continue"},
1419 {Opt_err_panic, "errors=panic"},
1420 {Opt_err_ro, "errors=remount-ro"},
1421 {Opt_nouid32, "nouid32"},
ac27a0ec 1422 {Opt_debug, "debug"},
72578c33
TT		 1423 {Opt_removed, "oldalloc"},
1424 {Opt_removed, "orlov"},
ac27a0ec
DK		 1425 {Opt_user_xattr, "user_xattr"},
1426 {Opt_nouser_xattr, "nouser_xattr"},
1427 {Opt_acl, "acl"},
1428 {Opt_noacl, "noacl"},
e3bb52ae 1429 {Opt_noload, "norecovery"},
5a916be1 1430 {Opt_noload, "noload"},
72578c33
TT		 1431 {Opt_removed, "nobh"},
1432 {Opt_removed, "bh"},
ac27a0ec 1433 {Opt_commit, "commit=%u"},
30773840
TT		 1434 {Opt_min_batch_time, "min_batch_time=%u"},
1435 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1436 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1437 {Opt_journal_path, "journal_path=%s"},
818d276c 1438 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1439 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1440 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1441 {Opt_abort, "abort"},
1442 {Opt_data_journal, "data=journal"},
1443 {Opt_data_ordered, "data=ordered"},
1444 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1445 {Opt_data_err_abort, "data_err=abort"},
1446 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1447 {Opt_offusrjquota, "usrjquota="},
1448 {Opt_usrjquota, "usrjquota=%s"},
1449 {Opt_offgrpjquota, "grpjquota="},
1450 {Opt_grpjquota, "grpjquota=%s"},
1451 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1452 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1453 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1454 {Opt_grpquota, "grpquota"},
1455 {Opt_noquota, "noquota"},
1456 {Opt_quota, "quota"},
1457 {Opt_usrquota, "usrquota"},
49da9392 1458 {Opt_prjquota, "prjquota"},
ac27a0ec 1459 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1460 {Opt_barrier, "barrier"},
1461 {Opt_nobarrier, "nobarrier"},
25ec56b5 1462 {Opt_i_version, "i_version"},
923ae0ff 1463 {Opt_dax, "dax"},
c9de560d 1464 {Opt_stripe, "stripe=%u"},
64769240 1465 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1466 {Opt_lazytime, "lazytime"},
1467 {Opt_nolazytime, "nolazytime"},
670e9875 1468 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1469 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1470 {Opt_removed, "mblk_io_submit"},
1471 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1472 {Opt_block_validity, "block_validity"},
1473 {Opt_noblock_validity, "noblock_validity"},
240799cd 1474 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1475 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1476 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1477 {Opt_auto_da_alloc, "auto_da_alloc"},
1478 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1479 {Opt_dioread_nolock, "dioread_nolock"},
1480 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1481 {Opt_discard, "discard"},
1482 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1483 {Opt_init_itable, "init_itable=%u"},
1484 {Opt_init_itable, "init_itable"},
1485 {Opt_noinit_itable, "noinit_itable"},
df981d03 1486 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1487 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1488 {Opt_nombcache, "nombcache"},
1489 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
c7198b9c
TT		 1490 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1491 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1492 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1493 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1494 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1495 {Opt_err, NULL},
ac27a0ec
DK		 1496};
1497
617ba13b 1498static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1499{
617ba13b 1500 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1501 char *options = (char *) *data;
1502
1503 if (!options || strncmp(options, "sb=", 3) != 0)
1504 return 1; /* Default location */
0b8e58a1 1505
ac27a0ec 1506 options += 3;
0b8e58a1 1507 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1508 sb_block = simple_strtoul(options, &options, 0);
1509 if (*options && *options != ',') {
4776004f 1510 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1511 (char *) *data);
1512 return 1;
1513 }
1514 if (*options == ',')
1515 options++;
1516 *data = (void *) options;
0b8e58a1 1517
ac27a0ec
DK		 1518 return sb_block;
1519}
1520
b3881f74 1521#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1522static const char deprecated_msg[] =
1523 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1524 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1525
56c50f11
DM		 1526#ifdef CONFIG_QUOTA
1527static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1528{
1529 struct ext4_sb_info *sbi = EXT4_SB(sb);
74255a2c 1530 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
03dafb5f 1531 int ret = -1;
56c50f11 1532
74255a2c 1533 if (sb_any_quota_loaded(sb) && !old_qname) {
56c50f11
DM		 1534 ext4_msg(sb, KERN_ERR,
1535 "Cannot change journaled "
1536 "quota options when quota turned on");
57f73c2c 1537 return -1;
56c50f11 1538 }
e2b911c5 1539 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1540 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1541 "ignored when QUOTA feature is enabled");
1542 return 1;
262b4662 1543 }
56c50f11
DM		 1544 qname = match_strdup(args);
1545 if (!qname) {
1546 ext4_msg(sb, KERN_ERR,
1547 "Not enough memory for storing quotafile name");
57f73c2c 1548 return -1;
56c50f11 1549 }
74255a2c
TT		 1550 if (old_qname) {
1551 if (strcmp(old_qname, qname) == 0)
03dafb5f
CG		 1552 ret = 1;
1553 else
1554 ext4_msg(sb, KERN_ERR,
1555 "%s quota file already specified",
1556 QTYPE2NAME(qtype));
1557 goto errout;
56c50f11 1558 }
03dafb5f 1559 if (strchr(qname, '/')) {
56c50f11
DM		 1560 ext4_msg(sb, KERN_ERR,
1561 "quotafile must be on filesystem root");
03dafb5f 1562 goto errout;
56c50f11 1563 }
74255a2c 1564 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
fd8c37ec 1565 set_opt(sb, QUOTA);
56c50f11 1566 return 1;
03dafb5f
CG		 1567errout:
1568 kfree(qname);
1569 return ret;
56c50f11
DM		 1570}
1571
1572static int clear_qf_name(struct super_block *sb, int qtype)
1573{
1574
1575 struct ext4_sb_info *sbi = EXT4_SB(sb);
74255a2c 1576 char *old_qname = get_qf_name(sb, sbi, qtype);
56c50f11 1577
74255a2c 1578 if (sb_any_quota_loaded(sb) && old_qname) {
56c50f11
DM		 1579 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1580 " when quota turned on");
57f73c2c 1581 return -1;
56c50f11 1582 }
74255a2c
TT		 1583 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1584 synchronize_rcu();
1585 kfree(old_qname);
56c50f11
DM		 1586 return 1;
1587}
1588#endif
1589
26092bf5
TT		 1590#define MOPT_SET 0x0001
1591#define MOPT_CLEAR 0x0002
1592#define MOPT_NOSUPPORT 0x0004
1593#define MOPT_EXPLICIT 0x0008
1594#define MOPT_CLEAR_ERR 0x0010
1595#define MOPT_GTE0 0x0020
ac27a0ec 1596#ifdef CONFIG_QUOTA
26092bf5
TT		 1597#define MOPT_Q 0
1598#define MOPT_QFMT 0x0040
1599#else
1600#define MOPT_Q MOPT_NOSUPPORT
1601#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1602#endif
26092bf5 1603#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1604#define MOPT_NO_EXT2 0x0100
1605#define MOPT_NO_EXT3 0x0200
1606#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1607#define MOPT_STRING 0x0400
26092bf5
TT		 1608
1609static const struct mount_opts {
1610 int token;
1611 int mount_opt;
1612 int flags;
1613} ext4_mount_opts[] = {
1614 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1615 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1616 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1617 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1618 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1619 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1620 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1621 MOPT_EXT4_ONLY | MOPT_SET},
1622 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1623 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1624 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1625 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1626 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1627 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1628 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1629 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1630 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1631 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1632 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1633 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1634 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1635 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1636 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1637 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1638 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1639 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1640 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1641 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1642 MOPT_NO_EXT2},
8dc0aa8c 1643 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1644 MOPT_NO_EXT2},
26092bf5
TT		 1645 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1646 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1647 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1648 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1649 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1650 {Opt_commit, 0, MOPT_GTE0},
1651 {Opt_max_batch_time, 0, MOPT_GTE0},
1652 {Opt_min_batch_time, 0, MOPT_GTE0},
1653 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1654 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1655 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1656 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1657 {Opt_resuid, 0, MOPT_GTE0},
1658 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1659 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1660 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1661 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1662 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1663 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1664 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1665 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1666 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1667 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1668#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1669 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1670 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1671#else
26092bf5
TT		 1672 {Opt_acl, 0, MOPT_NOSUPPORT},
1673 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1674#endif
26092bf5
TT		 1675 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1676 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1677 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1678 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1679 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1680 MOPT_SET | MOPT_Q},
1681 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1682 MOPT_SET | MOPT_Q},
49da9392
JK		 1683 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1684 MOPT_SET | MOPT_Q},
26092bf5 1685 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1686 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1687 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1688 {Opt_usrjquota, 0, MOPT_Q},
1689 {Opt_grpjquota, 0, MOPT_Q},
1690 {Opt_offusrjquota, 0, MOPT_Q},
1691 {Opt_offgrpjquota, 0, MOPT_Q},
1692 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1693 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1694 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1695 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1696 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
cdb7ee4c 1697 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
26092bf5
TT		 1698 {Opt_err, 0, 0}
1699};
1700
1701static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1702 substring_t *args, unsigned long *journal_devnum,
1703 unsigned int *journal_ioprio, int is_remount)
1704{
1705 struct ext4_sb_info *sbi = EXT4_SB(sb);
1706 const struct mount_opts *m;
08cefc7a
EB		 1707 kuid_t uid;
1708 kgid_t gid;
26092bf5
TT		 1709 int arg = 0;
1710
57f73c2c
TT		 1711#ifdef CONFIG_QUOTA
1712 if (token == Opt_usrjquota)
1713 return set_qf_name(sb, USRQUOTA, &args[0]);
1714 else if (token == Opt_grpjquota)
1715 return set_qf_name(sb, GRPQUOTA, &args[0]);
1716 else if (token == Opt_offusrjquota)
1717 return clear_qf_name(sb, USRQUOTA);
1718 else if (token == Opt_offgrpjquota)
1719 return clear_qf_name(sb, GRPQUOTA);
1720#endif
26092bf5 1721 switch (token) {
f7048605
TT		 1722 case Opt_noacl:
1723 case Opt_nouser_xattr:
1724 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1725 break;
26092bf5
TT		 1726 case Opt_sb:
1727 return 1; /* handled by get_sb_block() */
1728 case Opt_removed:
5f3633e3 1729 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1730 return 1;
26092bf5
TT		 1731 case Opt_abort:
1732 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1733 return 1;
1734 case Opt_i_version:
357fdad0 1735 sb->s_flags |= SB_I_VERSION;
26092bf5 1736 return 1;
a26f4992 1737 case Opt_lazytime:
1751e8a6 1738 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1739 return 1;
1740 case Opt_nolazytime:
1751e8a6 1741 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1742 return 1;
26092bf5
TT		 1743 }
1744
5f3633e3
JK		 1745 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1746 if (token == m->token)
1747 break;
1748
1749 if (m->token == Opt_err) {
1750 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1751 "or missing value", opt);
1752 return -1;
1753 }
1754
8dc0aa8c
TT		 1755 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1756 ext4_msg(sb, KERN_ERR,
1757 "Mount option \"%s\" incompatible with ext2", opt);
1758 return -1;
1759 }
1760 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1761 ext4_msg(sb, KERN_ERR,
1762 "Mount option \"%s\" incompatible with ext3", opt);
1763 return -1;
1764 }
1765
78a8da10
SF		 1766 if (token == Opt_err_panic && !capable(CAP_SYS_ADMIN)) {
1767 ext4_msg(sb, KERN_ERR,
1768 "Mount option \"%s\" not allowed for unprivileged mounts",
1769 opt);
1770 return -1;
1771 }
1772
ad4eec61 1773 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1774 return -1;
1775 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1776 return -1;
c93cf2d7
DM		 1777 if (m->flags & MOPT_EXPLICIT) {
1778 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1779 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1780 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1781 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1782 } else
1783 return -1;
1784 }
5f3633e3
JK		 1785 if (m->flags & MOPT_CLEAR_ERR)
1786 clear_opt(sb, ERRORS_MASK);
1787 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1788 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1789 "options when quota turned on");
1790 return -1;
1791 }
1792
1793 if (m->flags & MOPT_NOSUPPORT) {
1794 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1795 } else if (token == Opt_commit) {
1796 if (arg == 0)
1797 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1798 sbi->s_commit_interval = HZ * arg;
670e9875 1799 } else if (token == Opt_debug_want_extra_isize) {
c6deee1c
TT		 1800 if ((arg & 1) ||
1801 (arg < 4) ||
1802 (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
1803 ext4_msg(sb, KERN_ERR,
1804 "Invalid want_extra_isize %d", arg);
1805 return -1;
1806 }
670e9875 1807 sbi->s_want_extra_isize = arg;
5f3633e3 1808 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1809 sbi->s_max_batch_time = arg;
1810 } else if (token == Opt_min_batch_time) {
1811 sbi->s_min_batch_time = arg;
1812 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1813 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1814 ext4_msg(sb, KERN_ERR,
1815 "EXT4-fs: inode_readahead_blks must be "
1816 "0 or a power of 2 smaller than 2^31");
26092bf5 1817 return -1;
5f3633e3
JK		 1818 }
1819 sbi->s_inode_readahead_blks = arg;
1820 } else if (token == Opt_init_itable) {
1821 set_opt(sb, INIT_INODE_TABLE);
1822 if (!args->from)
1823 arg = EXT4_DEF_LI_WAIT_MULT;
1824 sbi->s_li_wait_mult = arg;
1825 } else if (token == Opt_max_dir_size_kb) {
1826 sbi->s_max_dir_size_kb = arg;
1827 } else if (token == Opt_stripe) {
1828 sbi->s_stripe = arg;
1829 } else if (token == Opt_resuid) {
78a8da10 1830 uid = make_kuid(sb->s_user_ns, arg);
5f3633e3
JK		 1831 if (!uid_valid(uid)) {
1832 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1833 return -1;
1834 }
5f3633e3
JK		 1835 sbi->s_resuid = uid;
1836 } else if (token == Opt_resgid) {
78a8da10 1837 gid = make_kgid(sb->s_user_ns, arg);
5f3633e3
JK		 1838 if (!gid_valid(gid)) {
1839 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1840 return -1;
1841 }
1842 sbi->s_resgid = gid;
1843 } else if (token == Opt_journal_dev) {
1844 if (is_remount) {
1845 ext4_msg(sb, KERN_ERR,
1846 "Cannot specify journal on remount");
1847 return -1;
1848 }
1849 *journal_devnum = arg;
ad4eec61
ES		 1850 } else if (token == Opt_journal_path) {
1851 char *journal_path;
1852 struct inode *journal_inode;
1853 struct path path;
1854 int error;
1855
1856 if (is_remount) {
1857 ext4_msg(sb, KERN_ERR,
1858 "Cannot specify journal on remount");
1859 return -1;
1860 }
1861 journal_path = match_strdup(&args[0]);
1862 if (!journal_path) {
1863 ext4_msg(sb, KERN_ERR, "error: could not dup "
1864 "journal device string");
1865 return -1;
1866 }
1867
1868 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1869 if (error) {
1870 ext4_msg(sb, KERN_ERR, "error: could not find "
1871 "journal device path: error %d", error);
1872 kfree(journal_path);
1873 return -1;
1874 }
1875
78a8da10
SF		 1876 /*
1877 * Refuse access for unprivileged mounts if the user does
1878 * not have rw access to the journal device via the supplied
1879 * path.
1880 */
1881 if (!capable(CAP_SYS_ADMIN) &&
1882 inode_permission(d_inode(path.dentry), MAY_READ|MAY_WRITE)) {
1883 ext4_msg(sb, KERN_ERR,
1884 "error: Insufficient access to journal path %s",
1885 journal_path);
1886 return -1;
1887 }
1888
2b0143b5 1889 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1890 if (!S_ISBLK(journal_inode->i_mode)) {
1891 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1892 "is not a block device", journal_path);
1893 path_put(&path);
1894 kfree(journal_path);
1895 return -1;
1896 }
1897
1898 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1899 path_put(&path);
1900 kfree(journal_path);
5f3633e3
JK		 1901 } else if (token == Opt_journal_ioprio) {
1902 if (arg > 7) {
1903 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1904 " (must be 0-7)");
1905 return -1;
1906 }
1907 *journal_ioprio =
1908 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1909 } else if (token == Opt_test_dummy_encryption) {
1910#ifdef CONFIG_EXT4_FS_ENCRYPTION
1911 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1912 ext4_msg(sb, KERN_WARNING,
1913 "Test dummy encryption mode enabled");
1914#else
1915 ext4_msg(sb, KERN_WARNING,
1916 "Test dummy encryption mount option ignored");
1917#endif
5f3633e3
JK		 1918 } else if (m->flags & MOPT_DATAJ) {
1919 if (is_remount) {
1920 if (!sbi->s_journal)
1921 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1922 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1923 ext4_msg(sb, KERN_ERR,
26092bf5 1924 "Cannot change data mode on remount");
26092bf5 1925 return -1;
ac27a0ec 1926 }
26092bf5 1927 } else {
5f3633e3
JK		 1928 clear_opt(sb, DATA_FLAGS);
1929 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1930 }
5f3633e3
JK		 1931#ifdef CONFIG_QUOTA
1932 } else if (m->flags & MOPT_QFMT) {
1933 if (sb_any_quota_loaded(sb) &&
1934 sbi->s_jquota_fmt != m->mount_opt) {
1935 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1936 "quota options when quota turned on");
1937 return -1;
1938 }
e2b911c5 1939 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1940 ext4_msg(sb, KERN_INFO,
1941 "Quota format mount options ignored "
262b4662 1942 "when QUOTA feature is enabled");
c325a67c 1943 return 1;
262b4662 1944 }
5f3633e3 1945 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1946#endif
923ae0ff 1947 } else if (token == Opt_dax) {
ef83b6e8
DW		 1948#ifdef CONFIG_FS_DAX
1949 ext4_msg(sb, KERN_WARNING,
1950 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1951 sbi->s_mount_opt |= m->mount_opt;
1952#else
923ae0ff
RZ		 1953 ext4_msg(sb, KERN_INFO, "dax option not supported");
1954 return -1;
5f3633e3 1955#endif
7915a861
AN		 1956 } else if (token == Opt_data_err_abort) {
1957 sbi->s_mount_opt |= m->mount_opt;
1958 } else if (token == Opt_data_err_ignore) {
1959 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1960 } else {
1961 if (!args->from)
1962 arg = 1;
1963 if (m->flags & MOPT_CLEAR)
1964 arg = !arg;
1965 else if (unlikely(!(m->flags & MOPT_SET))) {
1966 ext4_msg(sb, KERN_WARNING,
1967 "buggy handling of option %s", opt);
1968 WARN_ON(1);
1969 return -1;
1970 }
1971 if (arg != 0)
1972 sbi->s_mount_opt |= m->mount_opt;
1973 else
1974 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1975 }
5f3633e3 1976 return 1;
26092bf5
TT		 1977}
1978
1979static int parse_options(char *options, struct super_block *sb,
1980 unsigned long *journal_devnum,
1981 unsigned int *journal_ioprio,
1982 int is_remount)
1983{
1984 struct ext4_sb_info *sbi = EXT4_SB(sb);
74255a2c 1985 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
26092bf5
TT		 1986 substring_t args[MAX_OPT_ARGS];
1987 int token;
1988
1989 if (!options)
1990 return 1;
1991
1992 while ((p = strsep(&options, ",")) != NULL) {
1993 if (!*p)
1994 continue;
1995 /*
1996 * Initialize args struct so we know whether arg was
1997 * found; some options take optional arguments.
1998 */
caecd0af 1999 args[0].to = args[0].from = NULL;
26092bf5
TT		 2000 token = match_token(p, tokens, args);
2001 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2002 journal_ioprio, is_remount) < 0)
2003 return 0;
ac27a0ec
DK		 2004 }
2005#ifdef CONFIG_QUOTA
49da9392
JK		 2006 /*
2007 * We do the test below only for project quotas. 'usrquota' and
2008 * 'grpquota' mount options are allowed even without quota feature
2009 * to support legacy quotas in quota files.
2010 */
2011 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2012 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2013 "Cannot enable project quota enforcement.");
2014 return 0;
2015 }
74255a2c
TT		 2016 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2017 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2018 if (usr_qf_name || grp_qf_name) {
2019 if (test_opt(sb, USRQUOTA) && usr_qf_name)
fd8c37ec 2020 clear_opt(sb, USRQUOTA);
ac27a0ec 2021
74255a2c 2022 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
fd8c37ec 2023 clear_opt(sb, GRPQUOTA);
ac27a0ec 2024
56c50f11 2025 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 2026 ext4_msg(sb, KERN_ERR, "old and new quota "
2027 "format mixing");
ac27a0ec
DK		 2028 return 0;
2029 }
2030
2031 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 2032 ext4_msg(sb, KERN_ERR, "journaled quota format "
2033 "not specified");
ac27a0ec
DK		 2034 return 0;
2035 }
ac27a0ec
DK		 2036 }
2037#endif
261cb20c
JK		 2038 if (test_opt(sb, DIOREAD_NOLOCK)) {
2039 int blocksize =
2040 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2041
09cbfeaf 2042 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 2043 ext4_msg(sb, KERN_ERR, "can't mount with "
2044 "dioread_nolock if block size != PAGE_SIZE");
2045 return 0;
2046 }
2047 }
ac27a0ec
DK		 2048 return 1;
2049}
2050
2adf6da8
TT		 2051static inline void ext4_show_quota_options(struct seq_file *seq,
2052 struct super_block *sb)
2053{
2054#if defined(CONFIG_QUOTA)
2055 struct ext4_sb_info *sbi = EXT4_SB(sb);
74255a2c 2056 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2057
2058 if (sbi->s_jquota_fmt) {
2059 char *fmtname = "";
2060
2061 switch (sbi->s_jquota_fmt) {
2062 case QFMT_VFS_OLD:
2063 fmtname = "vfsold";
2064 break;
2065 case QFMT_VFS_V0:
2066 fmtname = "vfsv0";
2067 break;
2068 case QFMT_VFS_V1:
2069 fmtname = "vfsv1";
2070 break;
2071 }
2072 seq_printf(seq, ",jqfmt=%s", fmtname);
2073 }
2074
74255a2c
TT		 2075 rcu_read_lock();
2076 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2077 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2078 if (usr_qf_name)
2079 seq_show_option(seq, "usrjquota", usr_qf_name);
2080 if (grp_qf_name)
2081 seq_show_option(seq, "grpjquota", grp_qf_name);
2082 rcu_read_unlock();
2adf6da8
TT		 2083#endif
2084}
2085
5a916be1
TT		 2086static const char *token2str(int token)
2087{
50df9fd5 2088 const struct match_token *t;
5a916be1
TT		 2089
2090 for (t = tokens; t->token != Opt_err; t++)
2091 if (t->token == token && !strchr(t->pattern, '='))
2092 break;
2093 return t->pattern;
2094}
2095
2adf6da8
TT		 2096/*
2097 * Show an option if
2098 * - it's set to a non-default value OR
2099 * - if the per-sb default is different from the global default
2100 */
66acdcf4
TT		 2101static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2102 int nodefs)
2adf6da8 2103{
2adf6da8
TT		 2104 struct ext4_sb_info *sbi = EXT4_SB(sb);
2105 struct ext4_super_block *es = sbi->s_es;
66acdcf4 2106 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 2107 const struct mount_opts *m;
66acdcf4 2108 char sep = nodefs ? '\n' : ',';
2adf6da8 2109
66acdcf4
TT		 2110#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2111#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2112
2113 if (sbi->s_sb_block != 1)
5a916be1
TT		 2114 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2115
2116 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2117 int want_set = m->flags & MOPT_SET;
2118 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2119 (m->flags & MOPT_CLEAR_ERR))
2120 continue;
66acdcf4 2121 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2122 continue; /* skip if same as the default */
2123 if ((want_set &&
2124 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2125 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2126 continue; /* select Opt_noFoo vs Opt_Foo */
2127 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2128 }
5a916be1 2129
78a8da10 2130 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(sb->s_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2131 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a 2132 SEQ_OPTS_PRINT("resuid=%u",
78a8da10
SF		 2133 from_kuid_munged(sb->s_user_ns, sbi->s_resuid));
2134 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(sb->s_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2135 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a 2136 SEQ_OPTS_PRINT("resgid=%u",
78a8da10 2137 from_kgid_munged(sb->s_user_ns, sbi->s_resgid));
66acdcf4 2138 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2139 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2140 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2141 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2142 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2143 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2144 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2145 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2146 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2147 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2148 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2149 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2150 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2151 if (sb->s_flags & SB_I_VERSION)
5a916be1 2152 SEQ_OPTS_PUTS("i_version");
66acdcf4 2153 if (nodefs || sbi->s_stripe)
5a916be1 2154 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 2155 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2156 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2157 SEQ_OPTS_PUTS("data=journal");
2158 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2159 SEQ_OPTS_PUTS("data=ordered");
2160 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2161 SEQ_OPTS_PUTS("data=writeback");
2162 }
66acdcf4
TT		 2163 if (nodefs ||
2164 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2165 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2166 sbi->s_inode_readahead_blks);
2adf6da8 2167
66acdcf4
TT		 2168 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
2169 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2170 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2171 if (nodefs || sbi->s_max_dir_size_kb)
2172 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2173 if (test_opt(sb, DATA_ERR_ABORT))
2174 SEQ_OPTS_PUTS("data_err=abort");
70bf52b0
EB		 2175 if (DUMMY_ENCRYPTION_ENABLED(sbi))
2176 SEQ_OPTS_PUTS("test_dummy_encryption");
2adf6da8
TT		 2177
2178 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2179 return 0;
2180}
2181
66acdcf4
TT		 2182static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2183{
2184 return _ext4_show_options(seq, root->d_sb, 0);
2185}
2186
ebd173be 2187int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2188{
2189 struct super_block *sb = seq->private;
2190 int rc;
2191
bc98a42c 2192 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2193 rc = _ext4_show_options(seq, sb, 1);
2194 seq_puts(seq, "\n");
2195 return rc;
2196}
2197
617ba13b 2198static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2199 int read_only)
2200{
617ba13b 2201 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2202 int res = 0;
2203
617ba13b 2204 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2205 ext4_msg(sb, KERN_ERR, "revision level too high, "
2206 "forcing read-only mode");
1751e8a6 2207 res = SB_RDONLY;
ac27a0ec
DK		 2208 }
2209 if (read_only)
281b5995 2210 goto done;
617ba13b 2211 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2212 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2213 "running e2fsck is recommended");
c8b459f4 2214 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2215 ext4_msg(sb, KERN_WARNING,
2216 "warning: mounting fs with errors, "
2217 "running e2fsck is recommended");
ed3ce80a 2218 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2219 le16_to_cpu(es->s_mnt_count) >=
2220 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2221 ext4_msg(sb, KERN_WARNING,
2222 "warning: maximal mount count reached, "
2223 "running e2fsck is recommended");
ac27a0ec
DK		 2224 else if (le32_to_cpu(es->s_checkinterval) &&
2225 (le32_to_cpu(es->s_lastcheck) +
2226 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 2227 ext4_msg(sb, KERN_WARNING,
2228 "warning: checktime reached, "
2229 "running e2fsck is recommended");
0b8e58a1 2230 if (!sbi->s_journal)
0390131b 2231 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2232 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2233 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2234 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 2235 es->s_mtime = cpu_to_le32(get_seconds());
0390131b 2236 if (sbi->s_journal)
e2b911c5 2237 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2238
e2d67052 2239 ext4_commit_super(sb, 1);
281b5995 2240done:
ac27a0ec 2241 if (test_opt(sb, DEBUG))
a9df9a49 2242 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2243 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2244 sb->s_blocksize,
2245 sbi->s_groups_count,
617ba13b
MC		 2246 EXT4_BLOCKS_PER_GROUP(sb),
2247 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2248 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2249
7abc52c2 2250 cleancache_init_fs(sb);
ac27a0ec
DK		 2251 return res;
2252}
2253
117fff10
TT		 2254int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2255{
2256 struct ext4_sb_info *sbi = EXT4_SB(sb);
2257 struct flex_groups *new_groups;
2258 int size;
2259
2260 if (!sbi->s_log_groups_per_flex)
2261 return 0;
2262
2263 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2264 if (size <= sbi->s_flex_groups_allocated)
2265 return 0;
2266
2267 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
a7c3e901 2268 new_groups = kvzalloc(size, GFP_KERNEL);
117fff10
TT		 2269 if (!new_groups) {
2270 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2271 size / (int) sizeof(struct flex_groups));
2272 return -ENOMEM;
2273 }
2274
2275 if (sbi->s_flex_groups) {
2276 memcpy(new_groups, sbi->s_flex_groups,
2277 (sbi->s_flex_groups_allocated *
2278 sizeof(struct flex_groups)));
b93b41d4 2279 kvfree(sbi->s_flex_groups);
117fff10
TT		 2280 }
2281 sbi->s_flex_groups = new_groups;
2282 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2283 return 0;
2284}
2285
772cb7c8
JS		 2286static int ext4_fill_flex_info(struct super_block *sb)
2287{
2288 struct ext4_sb_info *sbi = EXT4_SB(sb);
2289 struct ext4_group_desc *gdp = NULL;
772cb7c8 2290 ext4_group_t flex_group;
117fff10 2291 int i, err;
772cb7c8 2292
503358ae 2293 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2294 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2295 sbi->s_log_groups_per_flex = 0;
2296 return 1;
2297 }
2298
117fff10
TT		 2299 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2300 if (err)
9933fc0a 2301 goto failed;
772cb7c8 2302
772cb7c8 2303 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2304 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2305
2306 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2307 atomic_add(ext4_free_inodes_count(sb, gdp),
2308 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2309 atomic64_add(ext4_free_group_clusters(sb, gdp),
2310 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2311 atomic_add(ext4_used_dirs_count(sb, gdp),
2312 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2313 }
2314
2315 return 1;
2316failed:
2317 return 0;
2318}
2319
e2b911c5 2320static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2321 struct ext4_group_desc *gdp)
717d50e4 2322{
b47820ed 2323 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2324 __u16 crc = 0;
feb0ab32 2325 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2326 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2327
9aa5d32b 2328 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2329 /* Use new metadata_csum algorithm */
feb0ab32 2330 __u32 csum32;
b47820ed 2331 __u16 dummy_csum = 0;
feb0ab32 2332
feb0ab32
DW		 2333 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2334 sizeof(le_group));
b47820ed
DJ		 2335 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2336 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2337 sizeof(dummy_csum));
2338 offset += sizeof(dummy_csum);
2339 if (offset < sbi->s_desc_size)
2340 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2341 sbi->s_desc_size - offset);
feb0ab32
DW		 2342
2343 crc = csum32 & 0xFFFF;
2344 goto out;
717d50e4
AD		 2345 }
2346
feb0ab32 2347 /* old crc16 code */
e2b911c5 2348 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2349 return 0;
2350
feb0ab32
DW		 2351 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2352 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2353 crc = crc16(crc, (__u8 *)gdp, offset);
2354 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2355 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2356 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2357 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2358 crc = crc16(crc, (__u8 *)gdp + offset,
2359 le16_to_cpu(sbi->s_es->s_desc_size) -
2360 offset);
2361
2362out:
717d50e4
AD		 2363 return cpu_to_le16(crc);
2364}
2365
feb0ab32 2366int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2367 struct ext4_group_desc *gdp)
2368{
feb0ab32 2369 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2370 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2371 return 0;
2372
2373 return 1;
2374}
2375
feb0ab32
DW		 2376void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2377 struct ext4_group_desc *gdp)
2378{
2379 if (!ext4_has_group_desc_csum(sb))
2380 return;
e2b911c5 2381 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2382}
2383
ac27a0ec 2384/* Called at mount-time, super-block is locked */
bfff6873 2385static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2386 ext4_fsblk_t sb_block,
bfff6873 2387 ext4_group_t *first_not_zeroed)
ac27a0ec 2388{
617ba13b
MC		 2389 struct ext4_sb_info *sbi = EXT4_SB(sb);
2390 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2391 ext4_fsblk_t last_block;
dc526c1c 2392 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 2393 ext4_fsblk_t block_bitmap;
2394 ext4_fsblk_t inode_bitmap;
2395 ext4_fsblk_t inode_table;
ce421581 2396 int flexbg_flag = 0;
bfff6873 2397 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2398
e2b911c5 2399 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2400 flexbg_flag = 1;
2401
af5bc92d 2402 ext4_debug("Checking group descriptors");
ac27a0ec 2403
197cd65a
AM		 2404 for (i = 0; i < sbi->s_groups_count; i++) {
2405 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2406
ce421581 2407 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2408 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2409 else
2410 last_block = first_block +
617ba13b 2411 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2412
bfff6873
LC		 2413 if ((grp == sbi->s_groups_count) &&
2414 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2415 grp = i;
2416
8fadc143 2417 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2418 if (block_bitmap == sb_block) {
2419 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2420 "Block bitmap for group %u overlaps "
2421 "superblock", i);
a9bba765
TT		 2422 if (!sb_rdonly(sb))
2423 return 0;
829fa70d 2424 }
e1d8355d
TT		 2425 if (block_bitmap >= sb_block + 1 &&
2426 block_bitmap <= last_bg_block) {
2427 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2428 "Block bitmap for group %u overlaps "
2429 "block group descriptors", i);
2430 if (!sb_rdonly(sb))
2431 return 0;
2432 }
2b2d6d01 2433 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2434 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2435 "Block bitmap for group %u not in group "
b31e1552 2436 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2437 return 0;
2438 }
8fadc143 2439 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2440 if (inode_bitmap == sb_block) {
2441 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2442 "Inode bitmap for group %u overlaps "
2443 "superblock", i);
a9bba765
TT		 2444 if (!sb_rdonly(sb))
2445 return 0;
829fa70d 2446 }
e1d8355d
TT		 2447 if (inode_bitmap >= sb_block + 1 &&
2448 inode_bitmap <= last_bg_block) {
2449 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2450 "Inode bitmap for group %u overlaps "
2451 "block group descriptors", i);
2452 if (!sb_rdonly(sb))
2453 return 0;
2454 }
2b2d6d01 2455 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2456 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2457 "Inode bitmap for group %u not in group "
b31e1552 2458 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2459 return 0;
2460 }
8fadc143 2461 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2462 if (inode_table == sb_block) {
2463 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2464 "Inode table for group %u overlaps "
2465 "superblock", i);
a9bba765
TT		 2466 if (!sb_rdonly(sb))
2467 return 0;
829fa70d 2468 }
e1d8355d
TT		 2469 if (inode_table >= sb_block + 1 &&
2470 inode_table <= last_bg_block) {
2471 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2472 "Inode table for group %u overlaps "
2473 "block group descriptors", i);
2474 if (!sb_rdonly(sb))
2475 return 0;
2476 }
bd81d8ee 2477 if (inode_table < first_block ||
2b2d6d01 2478 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2479 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2480 "Inode table for group %u not in group "
b31e1552 2481 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2482 return 0;
2483 }
955ce5f5 2484 ext4_lock_group(sb, i);
feb0ab32 2485 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2486 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2487 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2488 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2489 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2490 if (!sb_rdonly(sb)) {
955ce5f5 2491 ext4_unlock_group(sb, i);
8a266467 2492 return 0;
7ee1ec4c 2493 }
717d50e4 2494 }
955ce5f5 2495 ext4_unlock_group(sb, i);
ce421581
JS		 2496 if (!flexbg_flag)
2497 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2498 }
bfff6873
LC		 2499 if (NULL != first_not_zeroed)
2500 *first_not_zeroed = grp;
ac27a0ec
DK		 2501 return 1;
2502}
2503
617ba13b 2504/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2505 * the superblock) which were deleted from all directories, but held open by
2506 * a process at the time of a crash. We walk the list and try to delete these
2507 * inodes at recovery time (only with a read-write filesystem).
2508 *
2509 * In order to keep the orphan inode chain consistent during traversal (in
2510 * case of crash during recovery), we link each inode into the superblock
2511 * orphan list_head and handle it the same way as an inode deletion during
2512 * normal operation (which journals the operations for us).
2513 *
2514 * We only do an iget() and an iput() on each inode, which is very safe if we
2515 * accidentally point at an in-use or already deleted inode. The worst that
2516 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2517 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2518 * e2fsck was run on this filesystem, and it must have already done the orphan
2519 * inode cleanup for us, so we can safely abort without any further action.
2520 */
2b2d6d01
TT		 2521static void ext4_orphan_cleanup(struct super_block *sb,
2522 struct ext4_super_block *es)
ac27a0ec
DK		 2523{
2524 unsigned int s_flags = sb->s_flags;
2c98eb5e 2525 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2526#ifdef CONFIG_QUOTA
95f1fda4 2527 int quota_update = 0;
ac27a0ec
DK		 2528 int i;
2529#endif
2530 if (!es->s_last_orphan) {
2531 jbd_debug(4, "no orphan inodes to clean up\n");
2532 return;
2533 }
2534
a8f48a95 2535 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2536 ext4_msg(sb, KERN_ERR, "write access "
2537 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2538 return;
2539 }
2540
d39195c3
AG		 2541 /* Check if feature set would not allow a r/w mount */
2542 if (!ext4_feature_set_ok(sb, 0)) {
2543 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2544 "unknown ROCOMPAT features");
2545 return;
2546 }
2547
617ba13b 2548 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2549 /* don't clear list on RO mount w/ errors */
1751e8a6 2550 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2551 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2552 "clearing orphan list.\n");
c25f9bc6
ES		 2553 es->s_last_orphan = 0;
2554 }
ac27a0ec
DK		 2555 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2556 return;
2557 }
2558
1751e8a6 2559 if (s_flags & SB_RDONLY) {
b31e1552 2560 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2561 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2562 }
2563#ifdef CONFIG_QUOTA
2564 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2565 sb->s_flags |= SB_ACTIVE;
95f1fda4 2566
2567 /*
2568 * Turn on quotas which were not enabled for read-only mounts if
2569 * filesystem has quota feature, so that they are updated correctly.
2570 */
1751e8a6 2571 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2572 int ret = ext4_enable_quotas(sb);
2573
2574 if (!ret)
2575 quota_update = 1;
2576 else
2577 ext4_msg(sb, KERN_ERR,
2578 "Cannot turn on quotas: error %d", ret);
2579 }
2580
2581 /* Turn on journaled quotas used for old sytle */
a2d4a646 2582 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2583 if (EXT4_SB(sb)->s_qf_names[i]) {
2584 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2585
2586 if (!ret)
2587 quota_update = 1;
2588 else
b31e1552
ES		 2589 ext4_msg(sb, KERN_ERR,
2590 "Cannot turn on journaled "
95f1fda4 2591 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2592 }
2593 }
2594#endif
2595
2596 while (es->s_last_orphan) {
2597 struct inode *inode;
2598
c65d5c6c
VN		 2599 /*
2600 * We may have encountered an error during cleanup; if
2601 * so, skip the rest.
2602 */
2603 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2604 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2605 es->s_last_orphan = 0;
2606 break;
2607 }
2608
97bd42b9
JB		 2609 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2610 if (IS_ERR(inode)) {
ac27a0ec
DK		 2611 es->s_last_orphan = 0;
2612 break;
2613 }
2614
617ba13b 2615 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2616 dquot_initialize(inode);
ac27a0ec 2617 if (inode->i_nlink) {
566370a2
PT		 2618 if (test_opt(sb, DEBUG))
2619 ext4_msg(sb, KERN_DEBUG,
2620 "%s: truncating inode %lu to %lld bytes",
2621 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2622 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2623 inode->i_ino, inode->i_size);
5955102c 2624 inode_lock(inode);
55f252c9 2625 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2626 ret = ext4_truncate(inode);
2627 if (ret)
2628 ext4_std_error(inode->i_sb, ret);
5955102c 2629 inode_unlock(inode);
ac27a0ec
DK		 2630 nr_truncates++;
2631 } else {
566370a2
PT		 2632 if (test_opt(sb, DEBUG))
2633 ext4_msg(sb, KERN_DEBUG,
2634 "%s: deleting unreferenced inode %lu",
2635 __func__, inode->i_ino);
ac27a0ec
DK		 2636 jbd_debug(2, "deleting unreferenced inode %lu\n",
2637 inode->i_ino);
2638 nr_orphans++;
2639 }
2640 iput(inode); /* The delete magic happens here! */
2641 }
2642
2b2d6d01 2643#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2644
2645 if (nr_orphans)
b31e1552
ES		 2646 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2647 PLURAL(nr_orphans));
ac27a0ec 2648 if (nr_truncates)
b31e1552
ES		 2649 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2650 PLURAL(nr_truncates));
ac27a0ec 2651#ifdef CONFIG_QUOTA
95f1fda4 2652 /* Turn off quotas if they were enabled for orphan cleanup */
2653 if (quota_update) {
2654 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2655 if (sb_dqopt(sb)->files[i])
2656 dquot_quota_off(sb, i);
2657 }
ac27a0ec
DK		 2658 }
2659#endif
1751e8a6 2660 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2661}
0b8e58a1 2662
cd2291a4
ES		 2663/*
2664 * Maximal extent format file size.
2665 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2666 * extent format containers, within a sector_t, and within i_blocks
2667 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2668 * so that won't be a limiting factor.
2669 *
f17722f9
LC		 2670 * However there is other limiting factor. We do store extents in the form
2671 * of starting block and length, hence the resulting length of the extent
2672 * covering maximum file size must fit into on-disk format containers as
2673 * well. Given that length is always by 1 unit bigger than max unit (because
2674 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2675 *
cd2291a4
ES		 2676 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2677 */
f287a1a5 2678static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2679{
2680 loff_t res;
2681 loff_t upper_limit = MAX_LFS_FILESIZE;
2682
2683 /* small i_blocks in vfs inode? */
f287a1a5 2684 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2685 /*
90c699a9 2686 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2687 * i_block represent total blocks in 512 bytes
2688 * 32 == size of vfs inode i_blocks * 8
2689 */
2690 upper_limit = (1LL << 32) - 1;
2691
2692 /* total blocks in file system block size */
2693 upper_limit >>= (blkbits - 9);
2694 upper_limit <<= blkbits;
2695 }
2696
f17722f9
LC		 2697 /*
2698 * 32-bit extent-start container, ee_block. We lower the maxbytes
2699 * by one fs block, so ee_len can cover the extent of maximum file
2700 * size
2701 */
2702 res = (1LL << 32) - 1;
cd2291a4 2703 res <<= blkbits;
cd2291a4
ES		 2704
2705 /* Sanity check against vm- & vfs- imposed limits */
2706 if (res > upper_limit)
2707 res = upper_limit;
2708
2709 return res;
2710}
ac27a0ec 2711
ac27a0ec 2712/*
cd2291a4 2713 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2714 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2715 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2716 */
f287a1a5 2717static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2718{
617ba13b 2719 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2720 int meta_blocks;
2721 loff_t upper_limit;
0b8e58a1
AD		 2722 /* This is calculated to be the largest file size for a dense, block
2723 * mapped file such that the file's total number of 512-byte sectors,
2724 * including data and all indirect blocks, does not exceed (2^48 - 1).
2725 *
2726 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2727 * number of 512-byte sectors of the file.
0fc1b451
AK		 2728 */
2729
f287a1a5 2730 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2731 /*
90c699a9 2732 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2733 * the inode i_block field represents total file blocks in
2734 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2735 */
2736 upper_limit = (1LL << 32) - 1;
2737
2738 /* total blocks in file system block size */
2739 upper_limit >>= (bits - 9);
2740
2741 } else {
8180a562
AK		 2742 /*
2743 * We use 48 bit ext4_inode i_blocks
2744 * With EXT4_HUGE_FILE_FL set the i_blocks
2745 * represent total number of blocks in
2746 * file system block size
2747 */
0fc1b451
AK		 2748 upper_limit = (1LL << 48) - 1;
2749
0fc1b451
AK		 2750 }
2751
2752 /* indirect blocks */
2753 meta_blocks = 1;
2754 /* double indirect blocks */
2755 meta_blocks += 1 + (1LL << (bits-2));
2756 /* tripple indirect blocks */
2757 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2758
2759 upper_limit -= meta_blocks;
2760 upper_limit <<= bits;
ac27a0ec
DK		 2761
2762 res += 1LL << (bits-2);
2763 res += 1LL << (2*(bits-2));
2764 res += 1LL << (3*(bits-2));
2765 res <<= bits;
2766 if (res > upper_limit)
2767 res = upper_limit;
0fc1b451
AK		 2768
2769 if (res > MAX_LFS_FILESIZE)
2770 res = MAX_LFS_FILESIZE;
2771
ac27a0ec
DK		 2772 return res;
2773}
2774
617ba13b 2775static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2776 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2777{
617ba13b 2778 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2779 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2780 int has_super = 0;
2781
2782 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2783
e2b911c5 2784 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2785 return logical_sb_block + nr + 1;
ac27a0ec 2786 bg = sbi->s_desc_per_block * nr;
617ba13b 2787 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2788 has_super = 1;
0b8e58a1 2789
bd63f6b0
DW		 2790 /*
2791 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2792 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2793 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2794 * compensate.
2795 */
2796 if (sb->s_blocksize == 1024 && nr == 0 &&
2797 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2798 has_super++;
2799
617ba13b 2800 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2801}
2802
c9de560d
AT		 2803/**
2804 * ext4_get_stripe_size: Get the stripe size.
2805 * @sbi: In memory super block info
2806 *
2807 * If we have specified it via mount option, then
2808 * use the mount option value. If the value specified at mount time is
2809 * greater than the blocks per group use the super block value.
2810 * If the super block value is greater than blocks per group return 0.
2811 * Allocator needs it be less than blocks per group.
2812 *
2813 */
2814static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2815{
2816 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2817 unsigned long stripe_width =
2818 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2819 int ret;
c9de560d
AT		 2820
2821 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2822 ret = sbi->s_stripe;
5469d7c3 2823 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2824 ret = stripe_width;
5469d7c3 2825 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2826 ret = stride;
2827 else
2828 ret = 0;
c9de560d 2829
3eb08658
DE		 2830 /*
2831 * If the stripe width is 1, this makes no sense and
2832 * we set it to 0 to turn off stripe handling code.
2833 */
2834 if (ret <= 1)
2835 ret = 0;
c9de560d 2836
3eb08658 2837 return ret;
c9de560d 2838}
ac27a0ec 2839
a13fb1a4
ES		 2840/*
2841 * Check whether this filesystem can be mounted based on
2842 * the features present and the RDONLY/RDWR mount requested.
2843 * Returns 1 if this filesystem can be mounted as requested,
2844 * 0 if it cannot be.
2845 */
2846static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2847{
e2b911c5 2848 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2849 ext4_msg(sb, KERN_ERR,
2850 "Couldn't mount because of "
2851 "unsupported optional features (%x)",
2852 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2853 ~EXT4_FEATURE_INCOMPAT_SUPP));
2854 return 0;
2855 }
2856
2857 if (readonly)
2858 return 1;
2859
e2b911c5 2860 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 2861 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 2862 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 2863 return 1;
2864 }
2865
a13fb1a4 2866 /* Check that feature set is OK for a read-write mount */
e2b911c5 2867 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2868 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2869 "unsupported optional features (%x)",
2870 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2871 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2872 return 0;
2873 }
2874 /*
2875 * Large file size enabled file system can only be mounted
2876 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2877 */
e2b911c5 2878 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2879 if (sizeof(blkcnt_t) < sizeof(u64)) {
2880 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2881 "cannot be mounted RDWR without "
2882 "CONFIG_LBDAF");
2883 return 0;
2884 }
2885 }
e2b911c5 2886 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2887 ext4_msg(sb, KERN_ERR,
2888 "Can't support bigalloc feature without "
2889 "extents feature\n");
2890 return 0;
2891 }
7c319d32 2892
b58ad7f8 2893#if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
86cd0ee5
TT		 2894 if (!readonly && (ext4_has_feature_quota(sb) ||
2895 ext4_has_feature_project(sb))) {
7c319d32 2896 ext4_msg(sb, KERN_ERR,
86cd0ee5 2897 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
689c958c
LX		 2898 return 0;
2899 }
7c319d32 2900#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2901 return 1;
2902}
2903
66e61a9e
TT		 2904/*
2905 * This function is called once a day if we have errors logged
2906 * on the file system
2907 */
235699a8 2908static void print_daily_error_info(struct timer_list *t)
66e61a9e 2909{
235699a8
KC		 2910 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2911 struct super_block *sb = sbi->s_sb;
2912 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 2913
2914 if (es->s_error_count)
ae0f78de
TT		 2915 /* fsck newer than v1.41.13 is needed to clean this condition. */
2916 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2917 le32_to_cpu(es->s_error_count));
2918 if (es->s_first_error_time) {
ae0f78de 2919 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2920 sb->s_id, le32_to_cpu(es->s_first_error_time),
2921 (int) sizeof(es->s_first_error_func),
2922 es->s_first_error_func,
2923 le32_to_cpu(es->s_first_error_line));
2924 if (es->s_first_error_ino)
651e1c3b 2925 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2926 le32_to_cpu(es->s_first_error_ino));
2927 if (es->s_first_error_block)
651e1c3b 2928 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2929 le64_to_cpu(es->s_first_error_block));
651e1c3b 2930 printk(KERN_CONT "\n");
66e61a9e
TT		 2931 }
2932 if (es->s_last_error_time) {
ae0f78de 2933 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2934 sb->s_id, le32_to_cpu(es->s_last_error_time),
2935 (int) sizeof(es->s_last_error_func),
2936 es->s_last_error_func,
2937 le32_to_cpu(es->s_last_error_line));
2938 if (es->s_last_error_ino)
651e1c3b 2939 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2940 le32_to_cpu(es->s_last_error_ino));
2941 if (es->s_last_error_block)
651e1c3b 2942 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2943 le64_to_cpu(es->s_last_error_block));
651e1c3b 2944 printk(KERN_CONT "\n");
66e61a9e
TT		 2945 }
2946 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2947}
2948
bfff6873
LC		 2949/* Find next suitable group and run ext4_init_inode_table */
2950static int ext4_run_li_request(struct ext4_li_request *elr)
2951{
2952 struct ext4_group_desc *gdp = NULL;
2953 ext4_group_t group, ngroups;
2954 struct super_block *sb;
2955 unsigned long timeout = 0;
2956 int ret = 0;
2957
2958 sb = elr->lr_super;
2959 ngroups = EXT4_SB(sb)->s_groups_count;
2960
2961 for (group = elr->lr_next_group; group < ngroups; group++) {
2962 gdp = ext4_get_group_desc(sb, group, NULL);
2963 if (!gdp) {
2964 ret = 1;
2965 break;
2966 }
2967
2968 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2969 break;
2970 }
2971
7f511862 2972 if (group >= ngroups)
bfff6873
LC		 2973 ret = 1;
2974
2975 if (!ret) {
2976 timeout = jiffies;
2977 ret = ext4_init_inode_table(sb, group,
2978 elr->lr_timeout ? 0 : 1);
2979 if (elr->lr_timeout == 0) {
51ce6511
LC		 2980 timeout = (jiffies - timeout) *
2981 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2982 elr->lr_timeout = timeout;
2983 }
2984 elr->lr_next_sched = jiffies + elr->lr_timeout;
2985 elr->lr_next_group = group + 1;
2986 }
bfff6873
LC		 2987 return ret;
2988}
2989
2990/*
2991 * Remove lr_request from the list_request and free the
4ed5c033 2992 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2993 */
2994static void ext4_remove_li_request(struct ext4_li_request *elr)
2995{
2996 struct ext4_sb_info *sbi;
2997
2998 if (!elr)
2999 return;
3000
3001 sbi = elr->lr_sbi;
3002
3003 list_del(&elr->lr_request);
3004 sbi->s_li_request = NULL;
3005 kfree(elr);
3006}
3007
3008static void ext4_unregister_li_request(struct super_block *sb)
3009{
1bb933fb
LC		 3010 mutex_lock(&ext4_li_mtx);
3011 if (!ext4_li_info) {
3012 mutex_unlock(&ext4_li_mtx);
bfff6873 3013 return;
1bb933fb 3014 }
bfff6873
LC		 3015
3016 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3017 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3018 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3019 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3020}
3021
8f1f7453
ES		 3022static struct task_struct *ext4_lazyinit_task;
3023
bfff6873
LC		 3024/*
3025 * This is the function where ext4lazyinit thread lives. It walks
3026 * through the request list searching for next scheduled filesystem.
3027 * When such a fs is found, run the lazy initialization request
3028 * (ext4_rn_li_request) and keep track of the time spend in this
3029 * function. Based on that time we compute next schedule time of
3030 * the request. When walking through the list is complete, compute
3031 * next waking time and put itself into sleep.
3032 */
3033static int ext4_lazyinit_thread(void *arg)
3034{
3035 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3036 struct list_head *pos, *n;
3037 struct ext4_li_request *elr;
4ed5c033 3038 unsigned long next_wakeup, cur;
bfff6873
LC		 3039
3040 BUG_ON(NULL == eli);
3041
bfff6873
LC		 3042cont_thread:
3043 while (true) {
3044 next_wakeup = MAX_JIFFY_OFFSET;
3045
3046 mutex_lock(&eli->li_list_mtx);
3047 if (list_empty(&eli->li_request_list)) {
3048 mutex_unlock(&eli->li_list_mtx);
3049 goto exit_thread;
3050 }
bfff6873 3051 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3052 int err = 0;
3053 int progress = 0;
bfff6873
LC		 3054 elr = list_entry(pos, struct ext4_li_request,
3055 lr_request);
3056
e22834f0
DM		 3057 if (time_before(jiffies, elr->lr_next_sched)) {
3058 if (time_before(elr->lr_next_sched, next_wakeup))
3059 next_wakeup = elr->lr_next_sched;
3060 continue;
3061 }
3062 if (down_read_trylock(&elr->lr_super->s_umount)) {
3063 if (sb_start_write_trylock(elr->lr_super)) {
3064 progress = 1;
3065 /*
3066 * We hold sb->s_umount, sb can not
3067 * be removed from the list, it is
3068 * now safe to drop li_list_mtx
3069 */
3070 mutex_unlock(&eli->li_list_mtx);
3071 err = ext4_run_li_request(elr);
3072 sb_end_write(elr->lr_super);
3073 mutex_lock(&eli->li_list_mtx);
3074 n = pos->next;
b2c78cd0 3075 }
e22834f0
DM		 3076 up_read((&elr->lr_super->s_umount));
3077 }
3078 /* error, remove the lazy_init job */
3079 if (err) {
3080 ext4_remove_li_request(elr);
3081 continue;
3082 }
3083 if (!progress) {
3084 elr->lr_next_sched = jiffies +
3085 (prandom_u32()
3086 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3087 }
bfff6873
LC		 3088 if (time_before(elr->lr_next_sched, next_wakeup))
3089 next_wakeup = elr->lr_next_sched;
3090 }
3091 mutex_unlock(&eli->li_list_mtx);
3092
a0acae0e 3093 try_to_freeze();
bfff6873 3094
4ed5c033
LC		 3095 cur = jiffies;
3096 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3097 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3098 cond_resched();
3099 continue;
3100 }
3101
4ed5c033
LC		 3102 schedule_timeout_interruptible(next_wakeup - cur);
3103
8f1f7453
ES		 3104 if (kthread_should_stop()) {
3105 ext4_clear_request_list();
3106 goto exit_thread;
3107 }
bfff6873
LC		 3108 }
3109
3110exit_thread:
3111 /*
3112 * It looks like the request list is empty, but we need
3113 * to check it under the li_list_mtx lock, to prevent any
3114 * additions into it, and of course we should lock ext4_li_mtx
3115 * to atomically free the list and ext4_li_info, because at
3116 * this point another ext4 filesystem could be registering
3117 * new one.
3118 */
3119 mutex_lock(&ext4_li_mtx);
3120 mutex_lock(&eli->li_list_mtx);
3121 if (!list_empty(&eli->li_request_list)) {
3122 mutex_unlock(&eli->li_list_mtx);
3123 mutex_unlock(&ext4_li_mtx);
3124 goto cont_thread;
3125 }
3126 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3127 kfree(ext4_li_info);
3128 ext4_li_info = NULL;
3129 mutex_unlock(&ext4_li_mtx);
3130
3131 return 0;
3132}
3133
3134static void ext4_clear_request_list(void)
3135{
3136 struct list_head *pos, *n;
3137 struct ext4_li_request *elr;
3138
3139 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3140 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3141 elr = list_entry(pos, struct ext4_li_request,
3142 lr_request);
3143 ext4_remove_li_request(elr);
3144 }
3145 mutex_unlock(&ext4_li_info->li_list_mtx);
3146}
3147
3148static int ext4_run_lazyinit_thread(void)
3149{
8f1f7453
ES		 3150 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3151 ext4_li_info, "ext4lazyinit");
3152 if (IS_ERR(ext4_lazyinit_task)) {
3153 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3154 ext4_clear_request_list();
bfff6873
LC		 3155 kfree(ext4_li_info);
3156 ext4_li_info = NULL;
92b97816 3157 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3158 "initialization thread\n",
3159 err);
3160 return err;
3161 }
3162 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3163 return 0;
3164}
3165
3166/*
3167 * Check whether it make sense to run itable init. thread or not.
3168 * If there is at least one uninitialized inode table, return
3169 * corresponding group number, else the loop goes through all
3170 * groups and return total number of groups.
3171 */
3172static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3173{
3174 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3175 struct ext4_group_desc *gdp = NULL;
3176
f128f0f4
TT		 3177 if (!ext4_has_group_desc_csum(sb))
3178 return ngroups;
3179
bfff6873
LC		 3180 for (group = 0; group < ngroups; group++) {
3181 gdp = ext4_get_group_desc(sb, group, NULL);
3182 if (!gdp)
3183 continue;
3184
2807664a 3185 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3186 break;
3187 }
3188
3189 return group;
3190}
3191
3192static int ext4_li_info_new(void)
3193{
3194 struct ext4_lazy_init *eli = NULL;
3195
3196 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3197 if (!eli)
3198 return -ENOMEM;
3199
bfff6873
LC		 3200 INIT_LIST_HEAD(&eli->li_request_list);
3201 mutex_init(&eli->li_list_mtx);
3202
bfff6873
LC		 3203 eli->li_state |= EXT4_LAZYINIT_QUIT;
3204
3205 ext4_li_info = eli;
3206
3207 return 0;
3208}
3209
3210static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3211 ext4_group_t start)
3212{
3213 struct ext4_sb_info *sbi = EXT4_SB(sb);
3214 struct ext4_li_request *elr;
bfff6873
LC		 3215
3216 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3217 if (!elr)
3218 return NULL;
3219
3220 elr->lr_super = sb;
3221 elr->lr_sbi = sbi;
3222 elr->lr_next_group = start;
3223
3224 /*
3225 * Randomize first schedule time of the request to
3226 * spread the inode table initialization requests
3227 * better.
3228 */
dd1f723b
TT		 3229 elr->lr_next_sched = jiffies + (prandom_u32() %
3230 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3231 return elr;
3232}
3233
7f511862
TT		 3234int ext4_register_li_request(struct super_block *sb,
3235 ext4_group_t first_not_zeroed)
bfff6873
LC		 3236{
3237 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3238 struct ext4_li_request *elr = NULL;
bfff6873 3239 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3240 int ret = 0;
bfff6873 3241
7f511862 3242 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3243 if (sbi->s_li_request != NULL) {
3244 /*
3245 * Reset timeout so it can be computed again, because
3246 * s_li_wait_mult might have changed.
3247 */
3248 sbi->s_li_request->lr_timeout = 0;
7f511862 3249 goto out;
51ce6511 3250 }
bfff6873 3251
bc98a42c 3252 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
55ff3840 3253 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3254 goto out;
bfff6873
LC		 3255
3256 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3257 if (!elr) {
3258 ret = -ENOMEM;
3259 goto out;
3260 }
bfff6873
LC		 3261
3262 if (NULL == ext4_li_info) {
3263 ret = ext4_li_info_new();
3264 if (ret)
3265 goto out;
3266 }
3267
3268 mutex_lock(&ext4_li_info->li_list_mtx);
3269 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3270 mutex_unlock(&ext4_li_info->li_list_mtx);
3271
3272 sbi->s_li_request = elr;
46e4690b
TM		 3273 /*
3274 * set elr to NULL here since it has been inserted to
3275 * the request_list and the removal and free of it is
3276 * handled by ext4_clear_request_list from now on.
3277 */
3278 elr = NULL;
bfff6873
LC		 3279
3280 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3281 ret = ext4_run_lazyinit_thread();
3282 if (ret)
3283 goto out;
3284 }
bfff6873 3285out:
beed5ecb
NK		 3286 mutex_unlock(&ext4_li_mtx);
3287 if (ret)
bfff6873 3288 kfree(elr);
bfff6873
LC		 3289 return ret;
3290}
3291
3292/*
3293 * We do not need to lock anything since this is called on
3294 * module unload.
3295 */
3296static void ext4_destroy_lazyinit_thread(void)
3297{
3298 /*
3299 * If thread exited earlier
3300 * there's nothing to be done.
3301 */
8f1f7453 3302 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3303 return;
3304
8f1f7453 3305 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3306}
3307
25ed6e8a
DW		 3308static int set_journal_csum_feature_set(struct super_block *sb)
3309{
3310 int ret = 1;
3311 int compat, incompat;
3312 struct ext4_sb_info *sbi = EXT4_SB(sb);
3313
9aa5d32b 3314 if (ext4_has_metadata_csum(sb)) {
db9ee220 3315 /* journal checksum v3 */
25ed6e8a 3316 compat = 0;
db9ee220 3317 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3318 } else {
3319 /* journal checksum v1 */
3320 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3321 incompat = 0;
3322 }
3323
feb8c6d3
DW		 3324 jbd2_journal_clear_features(sbi->s_journal,
3325 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3326 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3327 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3328 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3329 ret = jbd2_journal_set_features(sbi->s_journal,
3330 compat, 0,
3331 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3332 incompat);
3333 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3334 ret = jbd2_journal_set_features(sbi->s_journal,
3335 compat, 0,
3336 incompat);
3337 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3338 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3339 } else {
feb8c6d3
DW		 3340 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3341 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3342 }
3343
3344 return ret;
3345}
3346
952fc18e
TT		 3347/*
3348 * Note: calculating the overhead so we can be compatible with
3349 * historical BSD practice is quite difficult in the face of
3350 * clusters/bigalloc. This is because multiple metadata blocks from
3351 * different block group can end up in the same allocation cluster.
3352 * Calculating the exact overhead in the face of clustered allocation
3353 * requires either O(all block bitmaps) in memory or O(number of block
3354 * groups**2) in time. We will still calculate the superblock for
3355 * older file systems --- and if we come across with a bigalloc file
3356 * system with zero in s_overhead_clusters the estimate will be close to
3357 * correct especially for very large cluster sizes --- but for newer
3358 * file systems, it's better to calculate this figure once at mkfs
3359 * time, and store it in the superblock. If the superblock value is
3360 * present (even for non-bigalloc file systems), we will use it.
3361 */
3362static int count_overhead(struct super_block *sb, ext4_group_t grp,
3363 char *buf)
3364{
3365 struct ext4_sb_info *sbi = EXT4_SB(sb);
3366 struct ext4_group_desc *gdp;
3367 ext4_fsblk_t first_block, last_block, b;
3368 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3369 int s, j, count = 0;
3370
e2b911c5 3371 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3372 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3373 sbi->s_itb_per_group + 2);
3374
952fc18e
TT		 3375 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3376 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3377 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3378 for (i = 0; i < ngroups; i++) {
3379 gdp = ext4_get_group_desc(sb, i, NULL);
3380 b = ext4_block_bitmap(sb, gdp);
3381 if (b >= first_block && b <= last_block) {
3382 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3383 count++;
3384 }
3385 b = ext4_inode_bitmap(sb, gdp);
3386 if (b >= first_block && b <= last_block) {
3387 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3388 count++;
3389 }
3390 b = ext4_inode_table(sb, gdp);
3391 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3392 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3393 int c = EXT4_B2C(sbi, b - first_block);
3394 ext4_set_bit(c, buf);
3395 count++;
3396 }
3397 if (i != grp)
3398 continue;
3399 s = 0;
3400 if (ext4_bg_has_super(sb, grp)) {
3401 ext4_set_bit(s++, buf);
3402 count++;
3403 }
c48ae41b
TT		 3404 j = ext4_bg_num_gdb(sb, grp);
3405 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3406 ext4_error(sb, "Invalid number of block group "
3407 "descriptor blocks: %d", j);
3408 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3409 }
c48ae41b
TT		 3410 count += j;
3411 for (; j > 0; j--)
3412 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3413 }
3414 if (!count)
3415 return 0;
3416 return EXT4_CLUSTERS_PER_GROUP(sb) -
3417 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3418}
3419
3420/*
3421 * Compute the overhead and stash it in sbi->s_overhead
3422 */
3423int ext4_calculate_overhead(struct super_block *sb)
3424{
3425 struct ext4_sb_info *sbi = EXT4_SB(sb);
3426 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3427 struct inode *j_inode;
3428 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3429 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3430 ext4_fsblk_t overhead = 0;
4fdb5543 3431 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3432
952fc18e
TT		 3433 if (!buf)
3434 return -ENOMEM;
3435
3436 /*
3437 * Compute the overhead (FS structures). This is constant
3438 * for a given filesystem unless the number of block groups
3439 * changes so we cache the previous value until it does.
3440 */
3441
3442 /*
3443 * All of the blocks before first_data_block are overhead
3444 */
3445 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3446
3447 /*
3448 * Add the overhead found in each block group
3449 */
3450 for (i = 0; i < ngroups; i++) {
3451 int blks;
3452
3453 blks = count_overhead(sb, i, buf);
3454 overhead += blks;
3455 if (blks)
3456 memset(buf, 0, PAGE_SIZE);
3457 cond_resched();
3458 }
3c816ded
EW		 3459
3460 /*
3461 * Add the internal journal blocks whether the journal has been
3462 * loaded or not
3463 */
b003b524 3464 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3465 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3466 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3467 j_inode = ext4_get_journal_inode(sb, j_inum);
3468 if (j_inode) {
3469 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3470 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3471 iput(j_inode);
3472 } else {
3473 ext4_msg(sb, KERN_ERR, "can't get journal size");
3474 }
3475 }
952fc18e
TT		 3476 sbi->s_overhead = overhead;
3477 smp_wmb();
3478 free_page((unsigned long) buf);
3479 return 0;
3480}
3481
b5799018 3482static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3483{
3484 ext4_fsblk_t resv_clusters;
b5799018 3485 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3486
30fac0f7
JK		 3487 /*
3488 * There's no need to reserve anything when we aren't using extents.
3489 * The space estimates are exact, there are no unwritten extents,
3490 * hole punching doesn't need new metadata... This is needed especially
3491 * to keep ext2/3 backward compatibility.
3492 */
e2b911c5 3493 if (!ext4_has_feature_extents(sb))
b5799018 3494 return;
27dd4385
LC		 3495 /*
3496 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3497 * This should cover the situations where we can not afford to run
3498 * out of space like for example punch hole, or converting
556615dc 3499 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3500 * allocation would require 1, or 2 blocks, higher numbers are
3501 * very rare.
3502 */
b5799018
TT		 3503 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3504 sbi->s_cluster_bits);
27dd4385
LC		 3505
3506 do_div(resv_clusters, 50);
3507 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3508
b5799018 3509 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3510}
3511
2b2d6d01 3512static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3513{
5e405595 3514 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3515 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3516 struct buffer_head *bh;
617ba13b 3517 struct ext4_super_block *es = NULL;
5aee0f8a 3518 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3519 ext4_fsblk_t block;
3520 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3521 ext4_fsblk_t logical_sb_block;
ac27a0ec 3522 unsigned long offset = 0;
ac27a0ec
DK		 3523 unsigned long journal_devnum = 0;
3524 unsigned long def_mount_opts;
3525 struct inode *root;
0390131b 3526 const char *descr;
dcc7dae3 3527 int ret = -ENOMEM;
281b5995 3528 int blocksize, clustersize;
4ec11028
TT		 3529 unsigned int db_count;
3530 unsigned int i;
281b5995 3531 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3532 __u64 blocks_count;
07aa2ea1 3533 int err = 0;
b3881f74 3534 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3535 ext4_group_t first_not_zeroed;
ac27a0ec 3536
5aee0f8a
TT		 3537 if ((data && !orig_data) || !sbi)
3538 goto out_free_base;
705895b6 3539
34693c38
SF		 3540 if (!userns_mounts && !capable(CAP_SYS_ADMIN)) {
3541 ret = -EPERM;
3542 goto out_free_base;
3543 }
3544
aed9eb1b 3545 sbi->s_daxdev = dax_dev;
705895b6
PE		 3546 sbi->s_blockgroup_lock =
3547 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3548 if (!sbi->s_blockgroup_lock)
3549 goto out_free_base;
3550
ac27a0ec 3551 sb->s_fs_info = sbi;
2c0544b2 3552 sbi->s_sb = sb;
240799cd 3553 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3554 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3555 if (sb->s_bdev->bd_part)
3556 sbi->s_sectors_written_start =
3557 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3558
9f6200bb 3559 /* Cleanup superblock name */
ec3904dc 3560 strreplace(sb->s_id, '/', '!');
9f6200bb 3561
07aa2ea1 3562 /* -EINVAL is default */
dcc7dae3 3563 ret = -EINVAL;
617ba13b 3564 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3565 if (!blocksize) {
b31e1552 3566 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3567 goto out_fail;
3568 }
3569
3570 /*
617ba13b 3571 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3572 * block sizes. We need to calculate the offset from buffer start.
3573 */
617ba13b 3574 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3575 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3576 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3577 } else {
70bbb3e0 3578 logical_sb_block = sb_block;
ac27a0ec
DK		 3579 }
3580
a8ac900b 3581 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3582 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3583 goto out_fail;
3584 }
3585 /*
3586 * Note: s_es must be initialized as soon as possible because
617ba13b 3587 * some ext4 macro-instructions depend on its value
ac27a0ec 3588 */
2716b802 3589 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3590 sbi->s_es = es;
3591 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3592 if (sb->s_magic != EXT4_SUPER_MAGIC)
3593 goto cantfind_ext4;
afc32f7e 3594 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3595
feb0ab32 3596 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3597 if (ext4_has_feature_metadata_csum(sb) &&
3598 ext4_has_feature_gdt_csum(sb))
363307e6 3599 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3600 "redundant flags; please run fsck.");
3601
d25425f8
DW		 3602 /* Check for a known checksum algorithm */
3603 if (!ext4_verify_csum_type(sb, es)) {
3604 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3605 "unknown checksum algorithm.");
3606 silent = 1;
3607 goto cantfind_ext4;
3608 }
3609
0441984a 3610 /* Load the checksum driver */
c430b6f3
TT		 3611 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3612 if (IS_ERR(sbi->s_chksum_driver)) {
3613 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3614 ret = PTR_ERR(sbi->s_chksum_driver);
3615 sbi->s_chksum_driver = NULL;
3616 goto failed_mount;
0441984a
DW		 3617 }
3618
a9c47317
DW		 3619 /* Check superblock checksum */
3620 if (!ext4_superblock_csum_verify(sb, es)) {
3621 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3622 "invalid superblock checksum. Run e2fsck?");
3623 silent = 1;
6a797d27 3624 ret = -EFSBADCRC;
a9c47317
DW		 3625 goto cantfind_ext4;
3626 }
3627
3628 /* Precompute checksum seed for all metadata */
e2b911c5 3629 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3630 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3631 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3632 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3633 sizeof(es->s_uuid));
3634
ac27a0ec
DK		 3635 /* Set defaults before we parse the mount options */
3636 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3637 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3638 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3639 set_opt(sb, DEBUG);
87f26807 3640 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3641 set_opt(sb, GRPID);
617ba13b 3642 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3643 set_opt(sb, NO_UID32);
ea663336 3644 /* xattr user namespace & acls are now defaulted on */
ea663336 3645 set_opt(sb, XATTR_USER);
03010a33 3646#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3647 set_opt(sb, POSIX_ACL);
2e7842b8 3648#endif
98c1a759
DW		 3649 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3650 if (ext4_has_metadata_csum(sb))
3651 set_opt(sb, JOURNAL_CHECKSUM);
3652
617ba13b 3653 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3654 set_opt(sb, JOURNAL_DATA);
617ba13b 3655 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3656 set_opt(sb, ORDERED_DATA);
617ba13b 3657 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3658 set_opt(sb, WRITEBACK_DATA);
617ba13b 3659
78a8da10
SF		 3660 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) {
3661 if (!capable(CAP_SYS_ADMIN))
3662 goto failed_mount;
fd8c37ec 3663 set_opt(sb, ERRORS_PANIC);
78a8da10 3664 } else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) {
fd8c37ec 3665 set_opt(sb, ERRORS_CONT);
78a8da10 3666 } else {
fd8c37ec 3667 set_opt(sb, ERRORS_RO);
78a8da10 3668 }
45f1a9c3
DW		 3669 /* block_validity enabled by default; disable with noblock_validity */
3670 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3671 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3672 set_opt(sb, DISCARD);
ac27a0ec 3673
78a8da10
SF		 3674 sbi->s_resuid = make_kuid(sb->s_user_ns, le16_to_cpu(es->s_def_resuid));
3675 if (!uid_valid(sbi->s_resuid))
3676 sbi->s_resuid = make_kuid(sb->s_user_ns, EXT4_DEF_RESUID);
3677 sbi->s_resgid = make_kgid(sb->s_user_ns, le16_to_cpu(es->s_def_resgid));
3678 if (!gid_valid(sbi->s_resgid))
3679 sbi->s_resgid = make_kgid(sb->s_user_ns, EXT4_DEF_RESGID);
30773840
TT		 3680 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3681 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3682 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3683
8b67f04a 3684 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3685 set_opt(sb, BARRIER);
ac27a0ec 3686
dd919b98
AK		 3687 /*
3688 * enable delayed allocation by default
3689 * Use -o nodelalloc to turn it off
3690 */
bc0b75f7 3691 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3692 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3693 set_opt(sb, DELALLOC);
dd919b98 3694
51ce6511
LC		 3695 /*
3696 * set default s_li_wait_mult for lazyinit, for the case there is
3697 * no mount option specified.
3698 */
3699 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3700
e81de818
TT		 3701 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3702 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3703 blocksize > EXT4_MAX_BLOCK_SIZE) {
3704 ext4_msg(sb, KERN_ERR,
3705 "Unsupported filesystem blocksize %d (%d log_block_size)",
3706 blocksize, le32_to_cpu(es->s_log_block_size));
3707 goto failed_mount;
3708 }
3709
c6deee1c
TT		 3710 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3711 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3712 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3713 } else {
3714 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3715 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3716 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3717 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3718 sbi->s_first_ino);
3719 goto failed_mount;
3720 }
3721 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3722 (!is_power_of_2(sbi->s_inode_size)) ||
3723 (sbi->s_inode_size > blocksize)) {
3724 ext4_msg(sb, KERN_ERR,
3725 "unsupported inode size: %d",
3726 sbi->s_inode_size);
e81de818 3727 ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
c6deee1c
TT		 3728 goto failed_mount;
3729 }
3730 /*
3731 * i_atime_extra is the last extra field available for
3732 * [acm]times in struct ext4_inode. Checking for that
3733 * field should suffice to ensure we have extra space
3734 * for all three.
3735 */
3736 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
3737 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
3738 sb->s_time_gran = 1;
3739 } else {
3740 sb->s_time_gran = NSEC_PER_SEC;
3741 }
3742 }
3743 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3744 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3745 EXT4_GOOD_OLD_INODE_SIZE;
3746 if (ext4_has_feature_extra_isize(sb)) {
3747 unsigned v, max = (sbi->s_inode_size -
3748 EXT4_GOOD_OLD_INODE_SIZE);
3749
3750 v = le16_to_cpu(es->s_want_extra_isize);
3751 if (v > max) {
3752 ext4_msg(sb, KERN_ERR,
3753 "bad s_want_extra_isize: %d", v);
3754 goto failed_mount;
3755 }
3756 if (sbi->s_want_extra_isize < v)
3757 sbi->s_want_extra_isize = v;
3758
3759 v = le16_to_cpu(es->s_min_extra_isize);
3760 if (v > max) {
3761 ext4_msg(sb, KERN_ERR,
3762 "bad s_min_extra_isize: %d", v);
3763 goto failed_mount;
3764 }
3765 if (sbi->s_want_extra_isize < v)
3766 sbi->s_want_extra_isize = v;
3767 }
3768 }
3769
5aee0f8a
TT		 3770 if (sbi->s_es->s_mount_opts[0]) {
3771 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3772 sizeof(sbi->s_es->s_mount_opts),
3773 GFP_KERNEL);
3774 if (!s_mount_opts)
3775 goto failed_mount;
3776 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3777 &journal_ioprio, 0)) {
3778 ext4_msg(sb, KERN_WARNING,
3779 "failed to parse options in superblock: %s",
3780 s_mount_opts);
3781 }
3782 kfree(s_mount_opts);
8b67f04a 3783 }
5a916be1 3784 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3785 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3786 &journal_ioprio, 0))
ac27a0ec
DK		 3787 goto failed_mount;
3788
56889787
TT		 3789 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3790 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3791 "with data=journal disables delayed "
3792 "allocation and O_DIRECT support!\n");
3793 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3794 ext4_msg(sb, KERN_ERR, "can't mount with "
3795 "both data=journal and delalloc");
3796 goto failed_mount;
3797 }
3798 if (test_opt(sb, DIOREAD_NOLOCK)) {
3799 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3800 "both data=journal and dioread_nolock");
56889787
TT		 3801 goto failed_mount;
3802 }
923ae0ff
RZ		 3803 if (test_opt(sb, DAX)) {
3804 ext4_msg(sb, KERN_ERR, "can't mount with "
3805 "both data=journal and dax");
3806 goto failed_mount;
3807 }
73b92a2a
SK		 3808 if (ext4_has_feature_encrypt(sb)) {
3809 ext4_msg(sb, KERN_WARNING,
3810 "encrypted files will use data=ordered "
3811 "instead of data journaling mode");
3812 }
56889787
TT		 3813 if (test_opt(sb, DELALLOC))
3814 clear_opt(sb, DELALLOC);
001e4a87
TH		 3815 } else {
3816 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3817 }
3818
1751e8a6
LT		 3819 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3820 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 3821
617ba13b 3822 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3823 (ext4_has_compat_features(sb) ||
3824 ext4_has_ro_compat_features(sb) ||
3825 ext4_has_incompat_features(sb)))
b31e1552
ES		 3826 ext4_msg(sb, KERN_WARNING,
3827 "feature flags set on rev 0 fs, "
3828 "running e2fsck is recommended");
469108ff 3829
ed3654eb
TT		 3830 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3831 set_opt2(sb, HURD_COMPAT);
e2b911c5 3832 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3833 ext4_msg(sb, KERN_ERR,
3834 "The Hurd can't support 64-bit file systems");
3835 goto failed_mount;
3836 }
dec214d0
TE		 3837
3838 /*
3839 * ea_inode feature uses l_i_version field which is not
3840 * available in HURD_COMPAT mode.
3841 */
3842 if (ext4_has_feature_ea_inode(sb)) {
3843 ext4_msg(sb, KERN_ERR,
3844 "ea_inode feature is not supported for Hurd");
3845 goto failed_mount;
3846 }
ed3654eb
TT		 3847 }
3848
2035e776
TT		 3849 if (IS_EXT2_SB(sb)) {
3850 if (ext2_feature_set_ok(sb))
3851 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3852 "using the ext4 subsystem");
3853 else {
57973ae8
ES		 3854 /*
3855 * If we're probing be silent, if this looks like
3856 * it's actually an ext[34] filesystem.
3857 */
3858 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3859 goto failed_mount;
2035e776
TT		 3860 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3861 "to feature incompatibilities");
3862 goto failed_mount;
3863 }
3864 }
3865
3866 if (IS_EXT3_SB(sb)) {
3867 if (ext3_feature_set_ok(sb))
3868 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3869 "using the ext4 subsystem");
3870 else {
57973ae8
ES		 3871 /*
3872 * If we're probing be silent, if this looks like
3873 * it's actually an ext4 filesystem.
3874 */
3875 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3876 goto failed_mount;
2035e776
TT		 3877 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3878 "to feature incompatibilities");
3879 goto failed_mount;
3880 }
3881 }
3882
ac27a0ec
DK		 3883 /*
3884 * Check feature flags regardless of the revision level, since we
3885 * previously didn't change the revision level when setting the flags,
3886 * so there is a chance incompat flags are set on a rev 0 filesystem.
3887 */
bc98a42c 3888 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 3889 goto failed_mount;
a13fb1a4 3890
8cdf3372
TT		 3891 if (le32_to_cpu(es->s_log_block_size) >
3892 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3893 ext4_msg(sb, KERN_ERR,
3894 "Invalid log block size: %u",
3895 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3896 goto failed_mount;
3897 }
a23b2123
TT		 3898 if (le32_to_cpu(es->s_log_cluster_size) >
3899 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3900 ext4_msg(sb, KERN_ERR,
3901 "Invalid log cluster size: %u",
3902 le32_to_cpu(es->s_log_cluster_size));
3903 goto failed_mount;
3904 }
ac27a0ec 3905
5b9554dc
TT		 3906 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3907 ext4_msg(sb, KERN_ERR,
3908 "Number of reserved GDT blocks insanely large: %d",
3909 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3910 goto failed_mount;
3911 }
3912
923ae0ff 3913 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
559db4c6
RZ		 3914 if (ext4_has_feature_inline_data(sb)) {
3915 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3916 " that may contain inline data");
abfa431a 3917 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
559db4c6 3918 }
d8d53b26 3919 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
abfa431a
DW		 3920 ext4_msg(sb, KERN_ERR,
3921 "DAX unsupported by block device. Turning off DAX.");
3922 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
3923 }
923ae0ff
RZ		 3924 }
3925
e2b911c5 3926 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3927 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3928 es->s_encryption_level);
3929 goto failed_mount;
3930 }
3931
ac27a0ec 3932 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3933 /* Validate the filesystem blocksize */
3934 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3935 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3936 blocksize);
ac27a0ec
DK		 3937 goto failed_mount;
3938 }
3939
2b2d6d01 3940 brelse(bh);
70bbb3e0
AM		 3941 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3942 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3943 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3944 if (!bh) {
b31e1552
ES		 3945 ext4_msg(sb, KERN_ERR,
3946 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3947 goto failed_mount;
3948 }
2716b802 3949 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3950 sbi->s_es = es;
617ba13b 3951 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3952 ext4_msg(sb, KERN_ERR,
3953 "Magic mismatch, very weird!");
ac27a0ec
DK		 3954 goto failed_mount;
3955 }
3956 }
3957
e2b911c5 3958 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3959 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3960 has_huge_files);
3961 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3962
0d1ee42f 3963 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3964 if (ext4_has_feature_64bit(sb)) {
8fadc143 3965 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3966 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3967 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3968 ext4_msg(sb, KERN_ERR,
3969 "unsupported descriptor size %lu",
0d1ee42f
AR		 3970 sbi->s_desc_size);
3971 goto failed_mount;
3972 }
3973 } else
3974 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3975
ac27a0ec 3976 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3977 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 3978
617ba13b 3979 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3980 if (sbi->s_inodes_per_block == 0)
617ba13b 3981 goto cantfind_ext4;
cd6bb35b
TT		 3982 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3983 sbi->s_inodes_per_group > blocksize * 8) {
3984 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3985 sbi->s_blocks_per_group);
3986 goto failed_mount;
3987 }
ac27a0ec
DK		 3988 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3989 sbi->s_inodes_per_block;
0d1ee42f 3990 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3991 sbi->s_sbh = bh;
3992 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3993 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3994 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3995
2b2d6d01 3996 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3997 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3998 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3999 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 4000 i = le32_to_cpu(es->s_flags);
4001 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4002 sbi->s_hash_unsigned = 3;
4003 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 4004#ifdef __CHAR_UNSIGNED__
bc98a42c 4005 if (!sb_rdonly(sb))
23301410
TT		 4006 es->s_flags |=
4007 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4008 sbi->s_hash_unsigned = 3;
f99b2589 4009#else
bc98a42c 4010 if (!sb_rdonly(sb))
23301410
TT		 4011 es->s_flags |=
4012 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 4013#endif
23301410 4014 }
f99b2589 4015 }
ac27a0ec 4016
281b5995
TT		 4017 /* Handle clustersize */
4018 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 4019 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 4020 if (has_bigalloc) {
4021 if (clustersize < blocksize) {
4022 ext4_msg(sb, KERN_ERR,
4023 "cluster size (%d) smaller than "
4024 "block size (%d)", clustersize, blocksize);
4025 goto failed_mount;
4026 }
4027 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4028 le32_to_cpu(es->s_log_block_size);
4029 sbi->s_clusters_per_group =
4030 le32_to_cpu(es->s_clusters_per_group);
4031 if (sbi->s_clusters_per_group > blocksize * 8) {
4032 ext4_msg(sb, KERN_ERR,
4033 "#clusters per group too big: %lu",
4034 sbi->s_clusters_per_group);
4035 goto failed_mount;
4036 }
4037 if (sbi->s_blocks_per_group !=
4038 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4039 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4040 "clusters per group (%lu) inconsistent",
4041 sbi->s_blocks_per_group,
4042 sbi->s_clusters_per_group);
4043 goto failed_mount;
4044 }
4045 } else {
4046 if (clustersize != blocksize) {
a23b2123
TT		 4047 ext4_msg(sb, KERN_ERR,
4048 "fragment/cluster size (%d) != "
4049 "block size (%d)", clustersize, blocksize);
4050 goto failed_mount;
281b5995
TT		 4051 }
4052 if (sbi->s_blocks_per_group > blocksize * 8) {
4053 ext4_msg(sb, KERN_ERR,
4054 "#blocks per group too big: %lu",
4055 sbi->s_blocks_per_group);
4056 goto failed_mount;
4057 }
4058 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4059 sbi->s_cluster_bits = 0;
ac27a0ec 4060 }
281b5995
TT		 4061 sbi->s_cluster_ratio = clustersize / blocksize;
4062
960fd856
TT		 4063 /* Do we have standard group size of clustersize * 8 blocks ? */
4064 if (sbi->s_blocks_per_group == clustersize << 3)
4065 set_opt2(sb, STD_GROUP_SIZE);
4066
bf43d84b
ES		 4067 /*
4068 * Test whether we have more sectors than will fit in sector_t,
4069 * and whether the max offset is addressable by the page cache.
4070 */
5a9ae68a 4071 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 4072 ext4_blocks_count(es));
5a9ae68a 4073 if (err) {
b31e1552 4074 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 4075 " too large to mount safely on this system");
ac27a0ec 4076 if (sizeof(sector_t) < 8)
90c699a9 4077 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 4078 goto failed_mount;
4079 }
4080
617ba13b
MC		 4081 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4082 goto cantfind_ext4;
e7c95593 4083
0f2ddca6
FTN		 4084 /* check blocks count against device size */
4085 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4086 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 4087 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4088 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 4089 ext4_blocks_count(es), blocks_count);
4090 goto failed_mount;
4091 }
4092
0b8e58a1
AD		 4093 /*
4094 * It makes no sense for the first data block to be beyond the end
4095 * of the filesystem.
4096 */
4097 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 4098 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 4099 "block %u is beyond end of filesystem (%llu)",
4100 le32_to_cpu(es->s_first_data_block),
4101 ext4_blocks_count(es));
e7c95593
ES		 4102 goto failed_mount;
4103 }
a23b2123
TT		 4104 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4105 (sbi->s_cluster_ratio == 1)) {
4106 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4107 "block is 0 with a 1k block and cluster size");
4108 goto failed_mount;
4109 }
4110
bd81d8ee
LV		 4111 blocks_count = (ext4_blocks_count(es) -
4112 le32_to_cpu(es->s_first_data_block) +
4113 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4114 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 4115 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 4116 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 4117 "(block count %llu, first data block %u, "
b31e1552 4118 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 4119 ext4_blocks_count(es),
4120 le32_to_cpu(es->s_first_data_block),
4121 EXT4_BLOCKS_PER_GROUP(sb));
4122 goto failed_mount;
4123 }
bd81d8ee 4124 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 4125 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4126 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
97dae165
TT		 4127 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4128 le32_to_cpu(es->s_inodes_count)) {
4129 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4130 le32_to_cpu(es->s_inodes_count),
4131 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4132 ret = -EINVAL;
4133 goto failed_mount;
4134 }
617ba13b
MC		 4135 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4136 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 4137 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 4138 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 4139 ext4_msg(sb, KERN_WARNING,
4140 "first meta block group too large: %u "
4141 "(group descriptor block count %u)",
4142 le32_to_cpu(es->s_first_meta_bg), db_count);
4143 goto failed_mount;
4144 }
4145 }
a7c3e901 4146 sbi->s_group_desc = kvmalloc(db_count *
f18a5f21
TT		 4147 sizeof(struct buffer_head *),
4148 GFP_KERNEL);
ac27a0ec 4149 if (sbi->s_group_desc == NULL) {
b31e1552 4150 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4151 ret = -ENOMEM;
ac27a0ec
DK		 4152 goto failed_mount;
4153 }
4154
705895b6 4155 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4156
85c8f176
AP		 4157 /* Pre-read the descriptors into the buffer cache */
4158 for (i = 0; i < db_count; i++) {
4159 block = descriptor_loc(sb, logical_sb_block, i);
4160 sb_breadahead(sb, block);
4161 }
4162
ac27a0ec 4163 for (i = 0; i < db_count; i++) {
70bbb3e0 4164 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 4165 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 4166 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 4167 ext4_msg(sb, KERN_ERR,
4168 "can't read group descriptor %d", i);
ac27a0ec
DK		 4169 db_count = i;
4170 goto failed_mount2;
4171 }
4172 }
dc526c1c 4173 sbi->s_gdb_count = db_count;
829fa70d 4174 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4175 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4176 ret = -EFSCORRUPTED;
f9ae9cf5 4177 goto failed_mount2;
ac27a0ec 4178 }
772cb7c8 4179
235699a8 4180 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 4181
a75ae78f 4182 /* Register extent status tree shrinker */
eb68d0e2 4183 if (ext4_es_register_shrinker(sbi))
ce7e010a 4184 goto failed_mount3;
ce7e010a 4185
c9de560d 4186 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4187 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4188
f9ae9cf5
TT		 4189 /*
4190 * set up enough so that it can read an inode
4191 */
f6e63f90 4192 sb->s_op = &ext4_sops;
617ba13b
MC		 4193 sb->s_export_op = &ext4_export_ops;
4194 sb->s_xattr = ext4_xattr_handlers;
ffcc4182 4195#ifdef CONFIG_EXT4_FS_ENCRYPTION
a7550b30 4196 sb->s_cop = &ext4_cryptops;
ffcc4182 4197#endif
ac27a0ec 4198#ifdef CONFIG_QUOTA
617ba13b 4199 sb->dq_op = &ext4_quota_operations;
e2b911c5 4200 if (ext4_has_feature_quota(sb))
1fa5efe3 4201 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4202 else
4203 sb->s_qcop = &ext4_qctl_operations;
689c958c 4204 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4205#endif
85787090 4206 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4207
ac27a0ec 4208 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4209 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4210
4211 sb->s_root = NULL;
4212
4213 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4214 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4215
bc98a42c 4216 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4217 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4218 goto failed_mount3a;
c5e06d10 4219
ac27a0ec
DK		 4220 /*
4221 * The first inode we look at is the journal inode. Don't try
4222 * root first: it may be modified in the journal!
4223 */
e2b911c5 4224 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4225 err = ext4_load_journal(sb, es, journal_devnum);
4226 if (err)
50460fe8 4227 goto failed_mount3a;
bc98a42c 4228 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4229 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4230 ext4_msg(sb, KERN_ERR, "required journal recovery "
4231 "suppressed and not mounted read-only");
744692dc 4232 goto failed_mount_wq;
ac27a0ec 4233 } else {
1e381f60
DM		 4234 /* Nojournal mode, all journal mount options are illegal */
4235 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4236 ext4_msg(sb, KERN_ERR, "can't mount with "
4237 "journal_checksum, fs mounted w/o journal");
4238 goto failed_mount_wq;
4239 }
4240 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4241 ext4_msg(sb, KERN_ERR, "can't mount with "
4242 "journal_async_commit, fs mounted w/o journal");
4243 goto failed_mount_wq;
4244 }
4245 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4246 ext4_msg(sb, KERN_ERR, "can't mount with "
4247 "commit=%lu, fs mounted w/o journal",
4248 sbi->s_commit_interval / HZ);
4249 goto failed_mount_wq;
4250 }
4251 if (EXT4_MOUNT_DATA_FLAGS &
4252 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4253 ext4_msg(sb, KERN_ERR, "can't mount with "
4254 "data=, fs mounted w/o journal");
4255 goto failed_mount_wq;
4256 }
300e71e9 4257 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
1e381f60 4258 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4259 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4260 sbi->s_journal = NULL;
4261 needs_recovery = 0;
4262 goto no_journal;
ac27a0ec
DK		 4263 }
4264
e2b911c5 4265 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4266 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4267 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4268 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4269 goto failed_mount_wq;
eb40a09c
JS		 4270 }
4271
25ed6e8a
DW		 4272 if (!set_journal_csum_feature_set(sb)) {
4273 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4274 "feature set");
4275 goto failed_mount_wq;
d4da6c9c 4276 }
818d276c 4277
ac27a0ec
DK		 4278 /* We have now updated the journal if required, so we can
4279 * validate the data journaling mode. */
4280 switch (test_opt(sb, DATA_FLAGS)) {
4281 case 0:
4282 /* No mode set, assume a default based on the journal
63f57933
AM		 4283 * capabilities: ORDERED_DATA if the journal can
4284 * cope, else JOURNAL_DATA
4285 */
dab291af
MC		 4286 if (jbd2_journal_check_available_features
4287 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4288 set_opt(sb, ORDERED_DATA);
ac27a0ec 4289 else
fd8c37ec 4290 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4291 break;
4292
617ba13b
MC		 4293 case EXT4_MOUNT_ORDERED_DATA:
4294 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4295 if (!jbd2_journal_check_available_features
4296 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4297 ext4_msg(sb, KERN_ERR, "Journal does not support "
4298 "requested data journaling mode");
744692dc 4299 goto failed_mount_wq;
ac27a0ec
DK		 4300 }
4301 default:
4302 break;
4303 }
ab04df78
JK		 4304
4305 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4306 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4307 ext4_msg(sb, KERN_ERR, "can't mount with "
4308 "journal_async_commit in data=ordered mode");
4309 goto failed_mount_wq;
4310 }
4311
b3881f74 4312 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4313
18aadd47
BJ		 4314 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4315
ce7e010a 4316no_journal:
cdb7ee4c
TE		 4317 if (!test_opt(sb, NO_MBCACHE)) {
4318 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4319 if (!sbi->s_ea_block_cache) {
dec214d0 4320 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4321 "Failed to create ea_block_cache");
dec214d0
TE		 4322 goto failed_mount_wq;
4323 }
cdb7ee4c
TE		 4324
4325 if (ext4_has_feature_ea_inode(sb)) {
4326 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4327 if (!sbi->s_ea_inode_cache) {
4328 ext4_msg(sb, KERN_ERR,
4329 "Failed to create ea_inode_cache");
4330 goto failed_mount_wq;
4331 }
4332 }
9c191f70
M		 4333 }
4334
e2b911c5 4335 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 4336 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 4337 ext4_msg(sb, KERN_ERR,
4338 "Unsupported blocksize for fs encryption");
4339 goto failed_mount_wq;
4340 }
4341
bc98a42c 4342 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4343 !ext4_has_feature_encrypt(sb)) {
4344 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4345 ext4_commit_super(sb, 1);
4346 }
4347
952fc18e
TT		 4348 /*
4349 * Get the # of file system overhead blocks from the
4350 * superblock if present.
4351 */
4352 if (es->s_overhead_clusters)
4353 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4354 else {
07aa2ea1
LC		 4355 err = ext4_calculate_overhead(sb);
4356 if (err)
952fc18e
TT		 4357 goto failed_mount_wq;
4358 }
4359
fd89d5f2
TH		 4360 /*
4361 * The maximum number of concurrent works can be high and
4362 * concurrency isn't really necessary. Limit it to 1.
4363 */
2e8fa54e
JK		 4364 EXT4_SB(sb)->rsv_conversion_wq =
4365 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4366 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4367 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4368 ret = -ENOMEM;
2e8fa54e
JK		 4369 goto failed_mount4;
4370 }
4371
ac27a0ec 4372 /*
dab291af 4373 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4374 * so we can safely mount the rest of the filesystem now.
4375 */
4376
23b9aab1 4377 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 4378 if (IS_ERR(root)) {
b31e1552 4379 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4380 ret = PTR_ERR(root);
32a9bb57 4381 root = NULL;
ac27a0ec
DK		 4382 goto failed_mount4;
4383 }
4384 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4385 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4386 iput(root);
ac27a0ec
DK		 4387 goto failed_mount4;
4388 }
48fde701 4389 sb->s_root = d_make_root(root);
1d1fe1ee 4390 if (!sb->s_root) {
b31e1552 4391 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4392 ret = -ENOMEM;
4393 goto failed_mount4;
4394 }
ac27a0ec 4395
bc98a42c 4396 if (ext4_setup_super(sb, es, sb_rdonly(sb)))
1751e8a6 4397 sb->s_flags |= SB_RDONLY;
ef7f3835 4398
b5799018 4399 ext4_set_resv_clusters(sb);
27dd4385 4400
6fd058f7
TT		 4401 err = ext4_setup_system_zone(sb);
4402 if (err) {
b31e1552 4403 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4404 "zone (%d)", err);
f9ae9cf5
TT		 4405 goto failed_mount4a;
4406 }
4407
4408 ext4_ext_init(sb);
4409 err = ext4_mb_init(sb);
4410 if (err) {
4411 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4412 err);
dcf2d804 4413 goto failed_mount5;
c2774d84
AK		 4414 }
4415
d5e03cbb
TT		 4416 block = ext4_count_free_clusters(sb);
4417 ext4_free_blocks_count_set(sbi->s_es,
4418 EXT4_C2B(sbi, block));
2ba91331 4419 ext4_superblock_csum_set(sb);
908c7f19
TH		 4420 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4421 GFP_KERNEL);
d5e03cbb
TT		 4422 if (!err) {
4423 unsigned long freei = ext4_count_free_inodes(sb);
4424 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
2ba91331 4425 ext4_superblock_csum_set(sb);
908c7f19
TH		 4426 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4427 GFP_KERNEL);
d5e03cbb
TT		 4428 }
4429 if (!err)
4430 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4431 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4432 if (!err)
908c7f19
TH		 4433 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4434 GFP_KERNEL);
c8585c6f
DJ		 4435 if (!err)
4436 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4437
d5e03cbb
TT		 4438 if (err) {
4439 ext4_msg(sb, KERN_ERR, "insufficient memory");
4440 goto failed_mount6;
4441 }
4442
e2b911c5 4443 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4444 if (!ext4_fill_flex_info(sb)) {
4445 ext4_msg(sb, KERN_ERR,
4446 "unable to initialize "
4447 "flex_bg meta info!");
4448 goto failed_mount6;
4449 }
4450
bfff6873
LC		 4451 err = ext4_register_li_request(sb, first_not_zeroed);
4452 if (err)
dcf2d804 4453 goto failed_mount6;
bfff6873 4454
b5799018 4455 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4456 if (err)
4457 goto failed_mount7;
3197ebdb 4458
9b2ff357
JK		 4459#ifdef CONFIG_QUOTA
4460 /* Enable quota usage during mount. */
bc98a42c 4461 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4462 err = ext4_enable_quotas(sb);
4463 if (err)
4464 goto failed_mount8;
4465 }
4466#endif /* CONFIG_QUOTA */
4467
617ba13b
MC		 4468 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4469 ext4_orphan_cleanup(sb, es);
4470 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4471 if (needs_recovery) {
b31e1552 4472 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4473 ext4_mark_recovery_complete(sb, es);
4474 }
4475 if (EXT4_SB(sb)->s_journal) {
4476 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4477 descr = " journalled data mode";
4478 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4479 descr = " ordered data mode";
4480 else
4481 descr = " writeback data mode";
4482 } else
4483 descr = "out journal";
4484
79add3a3
LC		 4485 if (test_opt(sb, DISCARD)) {
4486 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4487 if (!blk_queue_discard(q))
4488 ext4_msg(sb, KERN_WARNING,
4489 "mounting with \"discard\" option, but "
4490 "the device does not support discard");
4491 }
4492
e294a537
TT		 4493 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4494 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4495 "Opts: %.*s%s%s", descr,
4496 (int) sizeof(sbi->s_es->s_mount_opts),
4497 sbi->s_es->s_mount_opts,
e294a537 4498 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4499
66e61a9e
TT		 4500 if (es->s_error_count)
4501 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4502
efbed4dc
TT		 4503 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4504 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4505 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4506 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4507
d4c402d9 4508 kfree(orig_data);
ac27a0ec
DK		 4509 return 0;
4510
617ba13b 4511cantfind_ext4:
ac27a0ec 4512 if (!silent)
b31e1552 4513 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4514 goto failed_mount;
4515
72ba7450
TT		 4516#ifdef CONFIG_QUOTA
4517failed_mount8:
ebd173be 4518 ext4_unregister_sysfs(sb);
72ba7450 4519#endif
dcf2d804
TM		 4520failed_mount7:
4521 ext4_unregister_li_request(sb);
4522failed_mount6:
f9ae9cf5 4523 ext4_mb_release(sb);
d5e03cbb 4524 if (sbi->s_flex_groups)
b93b41d4 4525 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4526 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4527 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4528 percpu_counter_destroy(&sbi->s_dirs_counter);
4529 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
238722f2 4530 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
00764937 4531failed_mount5:
f9ae9cf5
TT		 4532 ext4_ext_release(sb);
4533 ext4_release_system_zone(sb);
4534failed_mount4a:
94bf608a 4535 dput(sb->s_root);
32a9bb57 4536 sb->s_root = NULL;
94bf608a 4537failed_mount4:
b31e1552 4538 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4539 if (EXT4_SB(sb)->rsv_conversion_wq)
4540 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4541failed_mount_wq:
dec214d0
TE		 4542 if (sbi->s_ea_inode_cache) {
4543 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4544 sbi->s_ea_inode_cache = NULL;
4545 }
47387409
TE		 4546 if (sbi->s_ea_block_cache) {
4547 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4548 sbi->s_ea_block_cache = NULL;
82939d79 4549 }
0390131b
FM		 4550 if (sbi->s_journal) {
4551 jbd2_journal_destroy(sbi->s_journal);
4552 sbi->s_journal = NULL;
4553 }
50460fe8 4554failed_mount3a:
d3922a77 4555 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4556failed_mount3:
9105bb14 4557 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4558 if (sbi->s_mmp_tsk)
4559 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4560failed_mount2:
4561 for (i = 0; i < db_count; i++)
4562 brelse(sbi->s_group_desc[i]);
b93b41d4 4563 kvfree(sbi->s_group_desc);
ac27a0ec 4564failed_mount:
0441984a
DW		 4565 if (sbi->s_chksum_driver)
4566 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4567#ifdef CONFIG_QUOTA
a2d4a646 4568 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4569 kfree(sbi->s_qf_names[i]);
4570#endif
617ba13b 4571 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4572 brelse(bh);
4573out_fail:
78a8da10 4574 /* sb->s_user_ns will be put when sb is destroyed */
ac27a0ec 4575 sb->s_fs_info = NULL;
f6830165 4576 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4577out_free_base:
ac27a0ec 4578 kfree(sbi);
d4c402d9 4579 kfree(orig_data);
5e405595 4580 fs_put_dax(dax_dev);
07aa2ea1 4581 return err ? err : ret;
ac27a0ec
DK		 4582}
4583
4584/*
4585 * Setup any per-fs journal parameters now. We'll do this both on
4586 * initial mount, once the journal has been initialised but before we've
4587 * done any recovery; and again on any subsequent remount.
4588 */
617ba13b 4589static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4590{
617ba13b 4591 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4592
30773840
TT		 4593 journal->j_commit_interval = sbi->s_commit_interval;
4594 journal->j_min_batch_time = sbi->s_min_batch_time;
4595 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4596
a931da6a 4597 write_lock(&journal->j_state_lock);
ac27a0ec 4598 if (test_opt(sb, BARRIER))
dab291af 4599 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4600 else
dab291af 4601 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4602 if (test_opt(sb, DATA_ERR_ABORT))
4603 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4604 else
4605 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4606 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4607}
4608
c6cb7e77
EW		 4609static struct inode *ext4_get_journal_inode(struct super_block *sb,
4610 unsigned int journal_inum)
ac27a0ec
DK		 4611{
4612 struct inode *journal_inode;
ac27a0ec 4613
c6cb7e77
EW		 4614 /*
4615 * Test for the existence of a valid inode on disk. Bad things
4616 * happen if we iget() an unused inode, as the subsequent iput()
4617 * will try to delete it.
4618 */
23b9aab1 4619 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 4620 if (IS_ERR(journal_inode)) {
b31e1552 4621 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4622 return NULL;
4623 }
4624 if (!journal_inode->i_nlink) {
4625 make_bad_inode(journal_inode);
4626 iput(journal_inode);
b31e1552 4627 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4628 return NULL;
4629 }
4630
e5f8eab8 4631 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4632 journal_inode, journal_inode->i_size);
1d1fe1ee 4633 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4634 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4635 iput(journal_inode);
4636 return NULL;
4637 }
c6cb7e77
EW		 4638 return journal_inode;
4639}
4640
4641static journal_t *ext4_get_journal(struct super_block *sb,
4642 unsigned int journal_inum)
4643{
4644 struct inode *journal_inode;
4645 journal_t *journal;
4646
4647 BUG_ON(!ext4_has_feature_journal(sb));
4648
4649 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4650 if (!journal_inode)
4651 return NULL;
ac27a0ec 4652
dab291af 4653 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4654 if (!journal) {
b31e1552 4655 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4656 iput(journal_inode);
4657 return NULL;
4658 }
4659 journal->j_private = sb;
617ba13b 4660 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4661 return journal;
4662}
4663
617ba13b 4664static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4665 dev_t j_dev)
4666{
2b2d6d01 4667 struct buffer_head *bh;
ac27a0ec 4668 journal_t *journal;
617ba13b
MC		 4669 ext4_fsblk_t start;
4670 ext4_fsblk_t len;
ac27a0ec 4671 int hblock, blocksize;
617ba13b 4672 ext4_fsblk_t sb_block;
ac27a0ec 4673 unsigned long offset;
2b2d6d01 4674 struct ext4_super_block *es;
ac27a0ec
DK		 4675 struct block_device *bdev;
4676
e2b911c5 4677 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4678
b31e1552 4679 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4680 if (bdev == NULL)
4681 return NULL;
4682
ac27a0ec 4683 blocksize = sb->s_blocksize;
e1defc4f 4684 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4685 if (blocksize < hblock) {
b31e1552
ES		 4686 ext4_msg(sb, KERN_ERR,
4687 "blocksize too small for journal device");
ac27a0ec
DK		 4688 goto out_bdev;
4689 }
4690
617ba13b
MC		 4691 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4692 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4693 set_blocksize(bdev, blocksize);
4694 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4695 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4696 "external journal");
ac27a0ec
DK		 4697 goto out_bdev;
4698 }
4699
2716b802 4700 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4701 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4702 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4703 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4704 ext4_msg(sb, KERN_ERR, "external journal has "
4705 "bad superblock");
ac27a0ec
DK		 4706 brelse(bh);
4707 goto out_bdev;
4708 }
4709
df4763be
DW		 4710 if ((le32_to_cpu(es->s_feature_ro_compat) &
4711 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4712 es->s_checksum != ext4_superblock_csum(sb, es)) {
4713 ext4_msg(sb, KERN_ERR, "external journal has "
4714 "corrupt superblock");
4715 brelse(bh);
4716 goto out_bdev;
4717 }
4718
617ba13b 4719 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4720 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4721 brelse(bh);
4722 goto out_bdev;
4723 }
4724
bd81d8ee 4725 len = ext4_blocks_count(es);
ac27a0ec
DK		 4726 start = sb_block + 1;
4727 brelse(bh); /* we're done with the superblock */
4728
dab291af 4729 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4730 start, len, blocksize);
4731 if (!journal) {
b31e1552 4732 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4733 goto out_bdev;
4734 }
4735 journal->j_private = sb;
dfec8a14 4736 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4737 wait_on_buffer(journal->j_sb_buffer);
4738 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4739 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4740 goto out_journal;
4741 }
4742 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4743 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4744 "user (unsupported) - %d",
ac27a0ec
DK		 4745 be32_to_cpu(journal->j_superblock->s_nr_users));
4746 goto out_journal;
4747 }
617ba13b
MC		 4748 EXT4_SB(sb)->journal_bdev = bdev;
4749 ext4_init_journal_params(sb, journal);
ac27a0ec 4750 return journal;
0b8e58a1 4751
ac27a0ec 4752out_journal:
dab291af 4753 jbd2_journal_destroy(journal);
ac27a0ec 4754out_bdev:
617ba13b 4755 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4756 return NULL;
4757}
4758
617ba13b
MC		 4759static int ext4_load_journal(struct super_block *sb,
4760 struct ext4_super_block *es,
ac27a0ec
DK		 4761 unsigned long journal_devnum)
4762{
4763 journal_t *journal;
4764 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4765 dev_t journal_dev;
4766 int err = 0;
4767 int really_read_only;
4768
e2b911c5 4769 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4770
ac27a0ec
DK		 4771 if (journal_devnum &&
4772 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4773 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4774 "numbers have changed");
ac27a0ec
DK		 4775 journal_dev = new_decode_dev(journal_devnum);
4776 } else
4777 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4778
4779 really_read_only = bdev_read_only(sb->s_bdev);
4780
4781 /*
4782 * Are we loading a blank journal or performing recovery after a
4783 * crash? For recovery, we need to check in advance whether we
4784 * can get read-write access to the device.
4785 */
e2b911c5 4786 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 4787 if (sb_rdonly(sb)) {
b31e1552
ES		 4788 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4789 "required on readonly filesystem");
ac27a0ec 4790 if (really_read_only) {
b31e1552 4791 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 4792 "unavailable, cannot proceed "
4793 "(try mounting with noload)");
ac27a0ec
DK		 4794 return -EROFS;
4795 }
b31e1552
ES		 4796 ext4_msg(sb, KERN_INFO, "write access will "
4797 "be enabled during recovery");
ac27a0ec
DK		 4798 }
4799 }
4800
4801 if (journal_inum && journal_dev) {
b31e1552
ES		 4802 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4803 "and inode journals!");
ac27a0ec
DK		 4804 return -EINVAL;
4805 }
4806
4807 if (journal_inum) {
617ba13b 4808 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4809 return -EINVAL;
4810 } else {
617ba13b 4811 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4812 return -EINVAL;
4813 }
4814
90576c0b 4815 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4816 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4817
e2b911c5 4818 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4819 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4820 if (!err) {
4821 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4822 if (save)
4823 memcpy(save, ((char *) es) +
4824 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4825 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4826 if (save)
4827 memcpy(((char *) es) + EXT4_S_ERR_START,
4828 save, EXT4_S_ERR_LEN);
4829 kfree(save);
4830 }
ac27a0ec
DK		 4831
4832 if (err) {
b31e1552 4833 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4834 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4835 return err;
4836 }
4837
617ba13b
MC		 4838 EXT4_SB(sb)->s_journal = journal;
4839 ext4_clear_journal_err(sb, es);
ac27a0ec 4840
c41303ce 4841 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4842 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4843 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4844
4845 /* Make sure we flush the recovery flag to disk. */
e2d67052 4846 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4847 }
4848
4849 return 0;
4850}
4851
e2d67052 4852static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4853{
e2d67052 4854 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4855 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4856 int error = 0;
ac27a0ec 4857
bdfe0cbd 4858 if (!sbh || block_device_ejected(sb))
c4be0c1d 4859 return error;
0f9bb8a9
JD		 4860
4861 /*
4862 * The superblock bh should be mapped, but it might not be if the
4863 * device was hot-removed. Not much we can do but fail the I/O.
4864 */
4865 if (!buffer_mapped(sbh))
4866 return error;
4867
71290b36
TT		 4868 /*
4869 * If the file system is mounted read-only, don't update the
4870 * superblock write time. This avoids updating the superblock
4871 * write time when we are mounting the root file system
4872 * read/only but we need to replay the journal; at that point,
4873 * for people who are east of GMT and who make their clock
4874 * tick in localtime for Windows bug-for-bug compatibility,
4875 * the clock is set in the future, and this will cause e2fsck
4876 * to complain and force a full file system check.
4877 */
1751e8a6 4878 if (!(sb->s_flags & SB_RDONLY))
71290b36 4879 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4880 if (sb->s_bdev->bd_part)
4881 es->s_kbytes_written =
4882 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4883 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4884 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4885 else
4886 es->s_kbytes_written =
4887 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4888 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4889 ext4_free_blocks_count_set(es,
57042651
TT		 4890 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4891 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4892 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4893 es->s_free_inodes_count =
4894 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4895 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4896 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4897 ext4_superblock_csum_set(sb);
1566a48a
TT		 4898 if (sync)
4899 lock_buffer(sbh);
125f3af1 4900 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 4901 /*
4902 * Oh, dear. A previous attempt to write the
4903 * superblock failed. This could happen because the
4904 * USB device was yanked out. Or it could happen to
4905 * be a transient write error and maybe the block will
4906 * be remapped. Nothing we can do but to retry the
4907 * write and hope for the best.
4908 */
4909 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4910 "superblock detected");
4911 clear_buffer_write_io_error(sbh);
4912 set_buffer_uptodate(sbh);
4913 }
ac27a0ec 4914 mark_buffer_dirty(sbh);
914258bf 4915 if (sync) {
1566a48a 4916 unlock_buffer(sbh);
564bc402 4917 error = __sync_dirty_buffer(sbh,
00473374 4918 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c4be0c1d
TS		 4919 if (error)
4920 return error;
4921
4922 error = buffer_write_io_error(sbh);
4923 if (error) {
b31e1552
ES		 4924 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4925 "superblock");
914258bf
TT		 4926 clear_buffer_write_io_error(sbh);
4927 set_buffer_uptodate(sbh);
4928 }
4929 }
c4be0c1d 4930 return error;
ac27a0ec
DK		 4931}
4932
ac27a0ec
DK		 4933/*
4934 * Have we just finished recovery? If so, and if we are mounting (or
4935 * remounting) the filesystem readonly, then we will end up with a
4936 * consistent fs on disk. Record that fact.
4937 */
2b2d6d01
TT		 4938static void ext4_mark_recovery_complete(struct super_block *sb,
4939 struct ext4_super_block *es)
ac27a0ec 4940{
617ba13b 4941 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4942
e2b911c5 4943 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4944 BUG_ON(journal != NULL);
4945 return;
4946 }
dab291af 4947 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4948 if (jbd2_journal_flush(journal) < 0)
4949 goto out;
4950
bc98a42c 4951 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 4952 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4953 ext4_commit_super(sb, 1);
ac27a0ec 4954 }
7ffe1ea8
HK		 4955
4956out:
dab291af 4957 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4958}
4959
4960/*
4961 * If we are mounting (or read-write remounting) a filesystem whose journal
4962 * has recorded an error from a previous lifetime, move that error to the
4963 * main filesystem now.
4964 */
2b2d6d01
TT		 4965static void ext4_clear_journal_err(struct super_block *sb,
4966 struct ext4_super_block *es)
ac27a0ec
DK		 4967{
4968 journal_t *journal;
4969 int j_errno;
4970 const char *errstr;
4971
e2b911c5 4972 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4973
617ba13b 4974 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4975
4976 /*
4977 * Now check for any error status which may have been recorded in the
617ba13b 4978 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4979 */
4980
dab291af 4981 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4982 if (j_errno) {
4983 char nbuf[16];
4984
617ba13b 4985 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4986 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4987 "from previous mount: %s", errstr);
12062ddd 4988 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4989
617ba13b
MC		 4990 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4991 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4992 ext4_commit_super(sb, 1);
ac27a0ec 4993
dab291af 4994 jbd2_journal_clear_err(journal);
d796c52e 4995 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4996 }
4997}
4998
4999/*
5000 * Force the running and committing transactions to commit,
5001 * and wait on the commit.
5002 */
617ba13b 5003int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 5004{
5005 journal_t *journal;
ac27a0ec 5006
bc98a42c 5007 if (sb_rdonly(sb))
ac27a0ec
DK		 5008 return 0;
5009
617ba13b 5010 journal = EXT4_SB(sb)->s_journal;
b1deefc9 5011 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 5012}
5013
617ba13b 5014static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 5015{
14ce0cb4 5016 int ret = 0;
9eddacf9 5017 tid_t target;
06a407f1 5018 bool needs_barrier = false;
8d5d02e6 5019 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5020
0db1ff22
TT		 5021 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
5022 return 0;
5023
9bffad1e 5024 trace_ext4_sync_fs(sb, wait);
2e8fa54e 5025 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 5026 /*
5027 * Writeback quota in non-journalled quota case - journalled quota has
5028 * no dirty dquots
5029 */
5030 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 5031 /*
5032 * Data writeback is possible w/o journal transaction, so barrier must
5033 * being sent at the end of the function. But we can skip it if
5034 * transaction_commit will do it for us.
5035 */
bda32530
TT		 5036 if (sbi->s_journal) {
5037 target = jbd2_get_latest_transaction(sbi->s_journal);
5038 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5039 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5040 needs_barrier = true;
5041
5042 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5043 if (wait)
5044 ret = jbd2_log_wait_commit(sbi->s_journal,
5045 target);
5046 }
5047 } else if (wait && test_opt(sb, BARRIER))
06a407f1 5048 needs_barrier = true;
06a407f1
DM		 5049 if (needs_barrier) {
5050 int err;
5051 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5052 if (!ret)
5053 ret = err;
0390131b 5054 }
06a407f1
DM		 5055
5056 return ret;
5057}
5058
ac27a0ec
DK		 5059/*
5060 * LVM calls this function before a (read-only) snapshot is created. This
5061 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 5062 *
5063 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 5064 * state independently. It relies on upper layer to stop all data & metadata
5065 * modifications.
ac27a0ec 5066 */
c4be0c1d 5067static int ext4_freeze(struct super_block *sb)
ac27a0ec 5068{
c4be0c1d
TS		 5069 int error = 0;
5070 journal_t *journal;
ac27a0ec 5071
bc98a42c 5072 if (sb_rdonly(sb))
9ca92389 5073 return 0;
ac27a0ec 5074
9ca92389 5075 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 5076
bb044576
TT		 5077 if (journal) {
5078 /* Now we set up the journal barrier. */
5079 jbd2_journal_lock_updates(journal);
ac27a0ec 5080
bb044576
TT		 5081 /*
5082 * Don't clear the needs_recovery flag if we failed to
5083 * flush the journal.
5084 */
5085 error = jbd2_journal_flush(journal);
5086 if (error < 0)
5087 goto out;
c642dc9e
ES		 5088
5089 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 5090 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 5091 }
9ca92389 5092
9ca92389 5093 error = ext4_commit_super(sb, 1);
6b0310fb 5094out:
bb044576
TT		 5095 if (journal)
5096 /* we rely on upper layer to stop further updates */
5097 jbd2_journal_unlock_updates(journal);
6b0310fb 5098 return error;
ac27a0ec
DK		 5099}
5100
5101/*
5102 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5103 * flag here, even though the filesystem is not technically dirty yet.
5104 */
c4be0c1d 5105static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 5106{
bc98a42c 5107 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 5108 return 0;
5109
c642dc9e
ES		 5110 if (EXT4_SB(sb)->s_journal) {
5111 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 5112 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 5113 }
5114
9ca92389 5115 ext4_commit_super(sb, 1);
c4be0c1d 5116 return 0;
ac27a0ec
DK		 5117}
5118
673c6100
TT		 5119/*
5120 * Structure to save mount options for ext4_remount's benefit
5121 */
5122struct ext4_mount_options {
5123 unsigned long s_mount_opt;
a2595b8a 5124 unsigned long s_mount_opt2;
08cefc7a
EB		 5125 kuid_t s_resuid;
5126 kgid_t s_resgid;
673c6100
TT		 5127 unsigned long s_commit_interval;
5128 u32 s_min_batch_time, s_max_batch_time;
5129#ifdef CONFIG_QUOTA
5130 int s_jquota_fmt;
a2d4a646 5131 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 5132#endif
5133};
5134
2b2d6d01 5135static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5136{
2b2d6d01 5137 struct ext4_super_block *es;
617ba13b 5138 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5139 unsigned long old_sb_flags;
617ba13b 5140 struct ext4_mount_options old_opts;
c79d967d 5141 int enable_quota = 0;
8a266467 5142 ext4_group_t g;
b3881f74 5143 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5144 int err = 0;
ac27a0ec 5145#ifdef CONFIG_QUOTA
03dafb5f 5146 int i, j;
74255a2c 5147 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec 5148#endif
d4c402d9 5149 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 5150
5151 /* Store the original options */
5152 old_sb_flags = sb->s_flags;
5153 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5154 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5155 old_opts.s_resuid = sbi->s_resuid;
5156 old_opts.s_resgid = sbi->s_resgid;
5157 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5158 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5159 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5160#ifdef CONFIG_QUOTA
5161 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5162 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5163 if (sbi->s_qf_names[i]) {
74255a2c
TT		 5164 char *qf_name = get_qf_name(sb, sbi, i);
5165
5166 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 5167 if (!old_opts.s_qf_names[i]) {
5168 for (j = 0; j < i; j++)
5169 kfree(old_opts.s_qf_names[j]);
3e36a163 5170 kfree(orig_data);
03dafb5f
CG		 5171 return -ENOMEM;
5172 }
5173 } else
5174 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5175#endif
b3881f74
TT		 5176 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5177 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5178
661aa520 5179 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5180 err = -EINVAL;
5181 goto restore_opts;
5182 }
5183
6b992ff2 5184 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5185 test_opt(sb, JOURNAL_CHECKSUM)) {
5186 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5187 "during remount not supported; ignoring");
5188 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5189 }
5190
6ae6514b
PS		 5191 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5192 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5193 ext4_msg(sb, KERN_ERR, "can't mount with "
5194 "both data=journal and delalloc");
5195 err = -EINVAL;
5196 goto restore_opts;
5197 }
5198 if (test_opt(sb, DIOREAD_NOLOCK)) {
5199 ext4_msg(sb, KERN_ERR, "can't mount with "
5200 "both data=journal and dioread_nolock");
5201 err = -EINVAL;
5202 goto restore_opts;
5203 }
923ae0ff
RZ		 5204 if (test_opt(sb, DAX)) {
5205 ext4_msg(sb, KERN_ERR, "can't mount with "
5206 "both data=journal and dax");
5207 err = -EINVAL;
5208 goto restore_opts;
5209 }
ab04df78
JK		 5210 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5211 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5212 ext4_msg(sb, KERN_ERR, "can't mount with "
5213 "journal_async_commit in data=ordered mode");
5214 err = -EINVAL;
5215 goto restore_opts;
5216 }
923ae0ff
RZ		 5217 }
5218
cdb7ee4c
TE		 5219 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5220 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5221 err = -EINVAL;
5222 goto restore_opts;
5223 }
5224
923ae0ff
RZ		 5225 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5226 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5227 "dax flag with busy inodes while remounting");
5228 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 5229 }
5230
4ab2f15b 5231 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 5232 ext4_abort(sb, "Abort forced by user");
ac27a0ec 5233
1751e8a6
LT		 5234 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5235 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5236
5237 es = sbi->s_es;
5238
b3881f74 5239 if (sbi->s_journal) {
0390131b 5240 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5241 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5242 }
ac27a0ec 5243
1751e8a6
LT		 5244 if (*flags & SB_LAZYTIME)
5245 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5246
1751e8a6 5247 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5248 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5249 err = -EROFS;
5250 goto restore_opts;
5251 }
5252
1751e8a6 5253 if (*flags & SB_RDONLY) {
38c03b34
TT		 5254 err = sync_filesystem(sb);
5255 if (err < 0)
5256 goto restore_opts;
0f0dd62f
CH		 5257 err = dquot_suspend(sb, -1);
5258 if (err < 0)
c79d967d 5259 goto restore_opts;
c79d967d 5260
ac27a0ec
DK		 5261 /*
5262 * First of all, the unconditional stuff we have to do
5263 * to disable replay of the journal when we next remount
5264 */
1751e8a6 5265 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5266
5267 /*
5268 * OK, test if we are remounting a valid rw partition
5269 * readonly, and if so set the rdonly flag and then
5270 * mark the partition as valid again.
5271 */
617ba13b
MC		 5272 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5273 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5274 es->s_state = cpu_to_le16(sbi->s_mount_state);
5275
a63c9eb2 5276 if (sbi->s_journal)
0390131b 5277 ext4_mark_recovery_complete(sb, es);
9bed8748
TT		 5278 if (sbi->s_mmp_tsk)
5279 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5280 } else {
a13fb1a4 5281 /* Make sure we can mount this feature set readwrite */
e2b911c5 5282 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5283 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5284 err = -EROFS;
5285 goto restore_opts;
5286 }
8a266467
TT		 5287 /*
5288 * Make sure the group descriptor checksums
0b8e58a1 5289 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5290 */
5291 for (g = 0; g < sbi->s_groups_count; g++) {
5292 struct ext4_group_desc *gdp =
5293 ext4_get_group_desc(sb, g, NULL);
5294
feb0ab32 5295 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5296 ext4_msg(sb, KERN_ERR,
5297 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5298 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5299 le16_to_cpu(gdp->bg_checksum));
6a797d27 5300 err = -EFSBADCRC;
8a266467
TT		 5301 goto restore_opts;
5302 }
5303 }
5304
ead6596b
ES		 5305 /*
5306 * If we have an unprocessed orphan list hanging
5307 * around from a previously readonly bdev mount,
5308 * require a full umount/remount for now.
5309 */
5310 if (es->s_last_orphan) {
b31e1552 5311 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5312 "remount RDWR because of unprocessed "
5313 "orphan inode list. Please "
b31e1552 5314 "umount/remount instead");
ead6596b
ES		 5315 err = -EINVAL;
5316 goto restore_opts;
5317 }
5318
ac27a0ec
DK		 5319 /*
5320 * Mounting a RDONLY partition read-write, so reread
5321 * and store the current valid flag. (It may have
5322 * been changed by e2fsck since we originally mounted
5323 * the partition.)
5324 */
0390131b
FM		 5325 if (sbi->s_journal)
5326 ext4_clear_journal_err(sb, es);
ac27a0ec 5327 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 5328 if (!ext4_setup_super(sb, es, 0))
1751e8a6 5329 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5330 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5331 if (ext4_multi_mount_protect(sb,
5332 le64_to_cpu(es->s_mmp_block))) {
5333 err = -EROFS;
5334 goto restore_opts;
5335 }
c79d967d 5336 enable_quota = 1;
ac27a0ec
DK		 5337 }
5338 }
bfff6873
LC		 5339
5340 /*
5341 * Reinitialize lazy itable initialization thread based on
5342 * current settings
5343 */
bc98a42c 5344 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5345 ext4_unregister_li_request(sb);
5346 else {
5347 ext4_group_t first_not_zeroed;
5348 first_not_zeroed = ext4_has_uninit_itable(sb);
5349 ext4_register_li_request(sb, first_not_zeroed);
5350 }
5351
6fd058f7 5352 ext4_setup_system_zone(sb);
1751e8a6 5353 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY))
e2d67052 5354 ext4_commit_super(sb, 1);
0390131b 5355
ac27a0ec
DK		 5356#ifdef CONFIG_QUOTA
5357 /* Release old quota file names */
a2d4a646 5358 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5359 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5360 if (enable_quota) {
5361 if (sb_any_quota_suspended(sb))
5362 dquot_resume(sb, -1);
e2b911c5 5363 else if (ext4_has_feature_quota(sb)) {
7c319d32 5364 err = ext4_enable_quotas(sb);
07724f98 5365 if (err)
7c319d32 5366 goto restore_opts;
7c319d32
AK		 5367 }
5368 }
ac27a0ec 5369#endif
d4c402d9 5370
1751e8a6 5371 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5372 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5373 kfree(orig_data);
ac27a0ec 5374 return 0;
0b8e58a1 5375
ac27a0ec
DK		 5376restore_opts:
5377 sb->s_flags = old_sb_flags;
5378 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5379 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5380 sbi->s_resuid = old_opts.s_resuid;
5381 sbi->s_resgid = old_opts.s_resgid;
5382 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5383 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5384 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5385#ifdef CONFIG_QUOTA
5386 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5387 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
74255a2c
TT		 5388 to_free[i] = get_qf_name(sb, sbi, i);
5389 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 5390 }
74255a2c
TT		 5391 synchronize_rcu();
5392 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5393 kfree(to_free[i]);
ac27a0ec 5394#endif
d4c402d9 5395 kfree(orig_data);
ac27a0ec
DK		 5396 return err;
5397}
5398
689c958c
LX		 5399#ifdef CONFIG_QUOTA
5400static int ext4_statfs_project(struct super_block *sb,
5401 kprojid_t projid, struct kstatfs *buf)
5402{
5403 struct kqid qid;
5404 struct dquot *dquot;
5405 u64 limit;
5406 u64 curblock;
5407
5408 qid = make_kqid_projid(projid);
5409 dquot = dqget(sb, qid);
5410 if (IS_ERR(dquot))
5411 return PTR_ERR(dquot);
7b9ca4c6 5412 spin_lock(&dquot->dq_dqb_lock);
689c958c
LX		 5413
5414 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5415 dquot->dq_dqb.dqb_bsoftlimit :
5416 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5417 if (limit && buf->f_blocks > limit) {
5418 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5419 buf->f_blocks = limit;
5420 buf->f_bfree = buf->f_bavail =
5421 (buf->f_blocks > curblock) ?
5422 (buf->f_blocks - curblock) : 0;
5423 }
5424
5425 limit = dquot->dq_dqb.dqb_isoftlimit ?
5426 dquot->dq_dqb.dqb_isoftlimit :
5427 dquot->dq_dqb.dqb_ihardlimit;
5428 if (limit && buf->f_files > limit) {
5429 buf->f_files = limit;
5430 buf->f_ffree =
5431 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5432 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5433 }
5434
7b9ca4c6 5435 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5436 dqput(dquot);
5437 return 0;
5438}
5439#endif
5440
2b2d6d01 5441static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5442{
5443 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5444 struct ext4_sb_info *sbi = EXT4_SB(sb);
5445 struct ext4_super_block *es = sbi->s_es;
27dd4385 5446 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5447 u64 fsid;
d02a9391 5448 s64 bfree;
27dd4385 5449 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5450
952fc18e
TT		 5451 if (!test_opt(sb, MINIX_DF))
5452 overhead = sbi->s_overhead;
ac27a0ec 5453
617ba13b 5454 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5455 buf->f_bsize = sb->s_blocksize;
b72f78cb 5456 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5457 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5458 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5459 /* prevent underflow in case that few free space is available */
57042651 5460 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5461 buf->f_bavail = buf->f_bfree -
5462 (ext4_r_blocks_count(es) + resv_blocks);
5463 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5464 buf->f_bavail = 0;
5465 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5466 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5467 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5468 fsid = le64_to_cpup((void *)es->s_uuid) ^
5469 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5470 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5471 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5472
689c958c
LX		 5473#ifdef CONFIG_QUOTA
5474 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5475 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5476 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5477#endif
ac27a0ec
DK		 5478 return 0;
5479}
5480
ac27a0ec
DK		 5481
5482#ifdef CONFIG_QUOTA
5483
bc8230ee
JK		 5484/*
5485 * Helper functions so that transaction is started before we acquire dqio_sem
5486 * to keep correct lock ordering of transaction > dqio_sem
5487 */
ac27a0ec
DK		 5488static inline struct inode *dquot_to_inode(struct dquot *dquot)
5489{
4c376dca 5490 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5491}
5492
617ba13b 5493static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5494{
5495 int ret, err;
5496 handle_t *handle;
5497 struct inode *inode;
5498
5499 inode = dquot_to_inode(dquot);
9924a92a 5500 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5501 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5502 if (IS_ERR(handle))
5503 return PTR_ERR(handle);
5504 ret = dquot_commit(dquot);
617ba13b 5505 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5506 if (!ret)
5507 ret = err;
5508 return ret;
5509}
5510
617ba13b 5511static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5512{
5513 int ret, err;
5514 handle_t *handle;
5515
9924a92a 5516 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5517 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5518 if (IS_ERR(handle))
5519 return PTR_ERR(handle);
5520 ret = dquot_acquire(dquot);
617ba13b 5521 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5522 if (!ret)
5523 ret = err;
5524 return ret;
5525}
5526
617ba13b 5527static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5528{
5529 int ret, err;
5530 handle_t *handle;
5531
9924a92a 5532 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5533 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5534 if (IS_ERR(handle)) {
5535 /* Release dquot anyway to avoid endless cycle in dqput() */
5536 dquot_release(dquot);
ac27a0ec 5537 return PTR_ERR(handle);
9c3013e9 5538 }
ac27a0ec 5539 ret = dquot_release(dquot);
617ba13b 5540 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5541 if (!ret)
5542 ret = err;
5543 return ret;
5544}
5545
617ba13b 5546static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5547{
262b4662
JK		 5548 struct super_block *sb = dquot->dq_sb;
5549 struct ext4_sb_info *sbi = EXT4_SB(sb);
5550
2c8be6b2 5551 /* Are we journaling quotas? */
e2b911c5 5552 if (ext4_has_feature_quota(sb) ||
262b4662 5553 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5554 dquot_mark_dquot_dirty(dquot);
617ba13b 5555 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5556 } else {
5557 return dquot_mark_dquot_dirty(dquot);
5558 }
5559}
5560
617ba13b 5561static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5562{
5563 int ret, err;
5564 handle_t *handle;
5565
5566 /* Data block + inode block */
2b0143b5 5567 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5568 if (IS_ERR(handle))
5569 return PTR_ERR(handle);
5570 ret = dquot_commit_info(sb, type);
617ba13b 5571 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5572 if (!ret)
5573 ret = err;
5574 return ret;
5575}
5576
5577/*
5578 * Turn on quotas during mount time - we need to find
5579 * the quota file and such...
5580 */
617ba13b 5581static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5582{
74255a2c 5583 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
287a8095 5584 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5585}
5586
daf647d2
TT		 5587static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5588{
5589 struct ext4_inode_info *ei = EXT4_I(inode);
5590
5591 /* The first argument of lockdep_set_subclass has to be
5592 * *exactly* the same as the argument to init_rwsem() --- in
5593 * this case, in init_once() --- or lockdep gets unhappy
5594 * because the name of the lock is set using the
5595 * stringification of the argument to init_rwsem().
5596 */
5597 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5598 lockdep_set_subclass(&ei->i_data_sem, subclass);
5599}
5600
ac27a0ec
DK		 5601/*
5602 * Standard function to be called on quota_on
5603 */
617ba13b 5604static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5605 const struct path *path)
ac27a0ec
DK		 5606{
5607 int err;
ac27a0ec
DK		 5608
5609 if (!test_opt(sb, QUOTA))
5610 return -EINVAL;
0623543b 5611
ac27a0ec 5612 /* Quotafile not on the same filesystem? */
d8c9584e 5613 if (path->dentry->d_sb != sb)
ac27a0ec 5614 return -EXDEV;
0623543b
JK		 5615 /* Journaling quota? */
5616 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5617 /* Quotafile not in fs root? */
f00c9e44 5618 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5619 ext4_msg(sb, KERN_WARNING,
5620 "Quota file not on filesystem root. "
5621 "Journaled quota will not work");
91389240
JK		 5622 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5623 } else {
5624 /*
5625 * Clear the flag just in case mount options changed since
5626 * last time.
5627 */
5628 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 5629 }
0623543b
JK		 5630
5631 /*
5632 * When we journal data on quota file, we have to flush journal to see
5633 * all updates to the file when we bypass pagecache...
5634 */
0390131b 5635 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5636 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5637 /*
5638 * We don't need to lock updates but journal_flush() could
5639 * otherwise be livelocked...
5640 */
5641 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5642 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5643 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5644 if (err)
7ffe1ea8 5645 return err;
0623543b 5646 }
957153fc 5647
daf647d2
TT		 5648 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5649 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5650 if (err) {
daf647d2
TT		 5651 lockdep_set_quota_inode(path->dentry->d_inode,
5652 I_DATA_SEM_NORMAL);
957153fc
JK		 5653 } else {
5654 struct inode *inode = d_inode(path->dentry);
5655 handle_t *handle;
5656
61a92987
JK		 5657 /*
5658 * Set inode flags to prevent userspace from messing with quota
5659 * files. If this fails, we return success anyway since quotas
5660 * are already enabled and this is not a hard failure.
5661 */
957153fc
JK		 5662 inode_lock(inode);
5663 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5664 if (IS_ERR(handle))
5665 goto unlock_inode;
5666 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5667 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5668 S_NOATIME | S_IMMUTABLE);
5669 ext4_mark_inode_dirty(handle, inode);
5670 ext4_journal_stop(handle);
5671 unlock_inode:
5672 inode_unlock(inode);
5673 }
daf647d2 5674 return err;
ac27a0ec
DK		 5675}
5676
7c319d32
AK		 5677static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5678 unsigned int flags)
5679{
5680 int err;
5681 struct inode *qf_inode;
a2d4a646 5682 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5683 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5684 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5685 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5686 };
5687
e2b911c5 5688 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5689
5690 if (!qf_inums[type])
5691 return -EPERM;
5692
23b9aab1 5693 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32
AK		 5694 if (IS_ERR(qf_inode)) {
5695 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5696 return PTR_ERR(qf_inode);
5697 }
5698
bcb13850
JK		 5699 /* Don't account quota for quota files to avoid recursion */
5700 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5701 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32 5702 err = dquot_enable(qf_inode, type, format_id, flags);
daf647d2
TT		 5703 if (err)
5704 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
eacb2d62 5705 iput(qf_inode);
7c319d32
AK		 5706
5707 return err;
5708}
5709
5710/* Enable usage tracking for all quota types. */
5711static int ext4_enable_quotas(struct super_block *sb)
5712{
5713 int type, err = 0;
a2d4a646 5714 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5715 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5716 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5717 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5718 };
49da9392
JK		 5719 bool quota_mopt[EXT4_MAXQUOTAS] = {
5720 test_opt(sb, USRQUOTA),
5721 test_opt(sb, GRPQUOTA),
5722 test_opt(sb, PRJQUOTA),
5723 };
7c319d32 5724
91389240 5725 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 5726 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5727 if (qf_inums[type]) {
5728 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5729 DQUOT_USAGE_ENABLED |
5730 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32 5731 if (err) {
95f1fda4 5732 for (type--; type >= 0; type--)
5733 dquot_quota_off(sb, type);
5734
7c319d32 5735 ext4_warning(sb,
72ba7450
TT		 5736 "Failed to enable quota tracking "
5737 "(type=%d, err=%d). Please run "
5738 "e2fsck to fix.", type, err);
7c319d32
AK		 5739 return err;
5740 }
5741 }
5742 }
5743 return 0;
5744}
5745
ca0e05e4
DM		 5746static int ext4_quota_off(struct super_block *sb, int type)
5747{
21f97697
JK		 5748 struct inode *inode = sb_dqopt(sb)->files[type];
5749 handle_t *handle;
957153fc 5750 int err;
21f97697 5751
87009d86
DM		 5752 /* Force all delayed allocation blocks to be allocated.
5753 * Caller already holds s_umount sem */
5754 if (test_opt(sb, DELALLOC))
ca0e05e4 5755 sync_filesystem(sb);
ca0e05e4 5756
957153fc 5757 if (!inode || !igrab(inode))
0b268590
AG		 5758 goto out;
5759
957153fc 5760 err = dquot_quota_off(sb, type);
964edf66 5761 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 5762 goto out_put;
5763
5764 inode_lock(inode);
61a92987
JK		 5765 /*
5766 * Update modification times of quota files when userspace can
5767 * start looking at them. If we fail, we return success anyway since
5768 * this is not a hard failure and quotas are already disabled.
5769 */
9924a92a 5770 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697 5771 if (IS_ERR(handle))
957153fc
JK		 5772 goto out_unlock;
5773 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5774 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 5775 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5776 ext4_mark_inode_dirty(handle, inode);
5777 ext4_journal_stop(handle);
957153fc
JK		 5778out_unlock:
5779 inode_unlock(inode);
5780out_put:
964edf66 5781 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 5782 iput(inode);
5783 return err;
21f97697 5784out:
ca0e05e4
DM		 5785 return dquot_quota_off(sb, type);
5786}
5787
ac27a0ec
DK		 5788/* Read data from quotafile - avoid pagecache and such because we cannot afford
5789 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5790 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5791 * we don't have to be afraid of races */
617ba13b 5792static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5793 size_t len, loff_t off)
5794{
5795 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5796 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5797 int offset = off & (sb->s_blocksize - 1);
5798 int tocopy;
5799 size_t toread;
5800 struct buffer_head *bh;
5801 loff_t i_size = i_size_read(inode);
5802
5803 if (off > i_size)
5804 return 0;
5805 if (off+len > i_size)
5806 len = i_size-off;
5807 toread = len;
5808 while (toread > 0) {
5809 tocopy = sb->s_blocksize - offset < toread ?
5810 sb->s_blocksize - offset : toread;
1c215028
TT		 5811 bh = ext4_bread(NULL, inode, blk, 0);
5812 if (IS_ERR(bh))
5813 return PTR_ERR(bh);
ac27a0ec
DK		 5814 if (!bh) /* A hole? */
5815 memset(data, 0, tocopy);
5816 else
5817 memcpy(data, bh->b_data+offset, tocopy);
5818 brelse(bh);
5819 offset = 0;
5820 toread -= tocopy;
5821 data += tocopy;
5822 blk++;
5823 }
5824 return len;
5825}
5826
5827/* Write to quotafile (we know the transaction is already started and has
5828 * enough credits) */
617ba13b 5829static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5830 const char *data, size_t len, loff_t off)
5831{
5832 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5833 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5834 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5835 int retries = 0;
ac27a0ec
DK		 5836 struct buffer_head *bh;
5837 handle_t *handle = journal_current_handle();
5838
0390131b 5839 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5840 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5841 " cancelled because transaction is not started",
9c3013e9
JK		 5842 (unsigned long long)off, (unsigned long long)len);
5843 return -EIO;
5844 }
67eeb568
DM		 5845 /*
5846 * Since we account only one data block in transaction credits,
5847 * then it is impossible to cross a block boundary.
5848 */
5849 if (sb->s_blocksize - offset < len) {
5850 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5851 " cancelled because not block aligned",
5852 (unsigned long long)off, (unsigned long long)len);
5853 return -EIO;
5854 }
5855
c5e298ae
TT		 5856 do {
5857 bh = ext4_bread(handle, inode, blk,
5858 EXT4_GET_BLOCKS_CREATE |
5859 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5860 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5861 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5862 if (IS_ERR(bh))
5863 return PTR_ERR(bh);
67eeb568
DM		 5864 if (!bh)
5865 goto out;
5d601255 5866 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5867 err = ext4_journal_get_write_access(handle, bh);
5868 if (err) {
5869 brelse(bh);
1c215028 5870 return err;
ac27a0ec 5871 }
67eeb568
DM		 5872 lock_buffer(bh);
5873 memcpy(bh->b_data+offset, data, len);
5874 flush_dcache_page(bh->b_page);
5875 unlock_buffer(bh);
62d2b5f2 5876 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5877 brelse(bh);
ac27a0ec 5878out:
67eeb568
DM		 5879 if (inode->i_size < off + len) {
5880 i_size_write(inode, off + len);
617ba13b 5881 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5882 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5883 }
67eeb568 5884 return len;
ac27a0ec
DK		 5885}
5886
8f0e8746
TT		 5887static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5888{
5889 const struct quota_format_ops *ops;
5890
5891 if (!sb_has_quota_loaded(sb, qid->type))
5892 return -ESRCH;
5893 ops = sb_dqopt(sb)->ops[qid->type];
5894 if (!ops || !ops->get_next_id)
5895 return -ENOSYS;
5896 return dquot_get_next_id(sb, qid);
5897}
ac27a0ec
DK		 5898#endif
5899
152a0836
AV		 5900static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5901 const char *dev_name, void *data)
ac27a0ec 5902{
152a0836 5903 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5904}
5905
c290ea01 5906#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5907static inline void register_as_ext2(void)
5908{
5909 int err = register_filesystem(&ext2_fs_type);
5910 if (err)
5911 printk(KERN_WARNING
5912 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5913}
5914
5915static inline void unregister_as_ext2(void)
5916{
5917 unregister_filesystem(&ext2_fs_type);
5918}
2035e776
TT		 5919
5920static inline int ext2_feature_set_ok(struct super_block *sb)
5921{
e2b911c5 5922 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 5923 return 0;
bc98a42c 5924 if (sb_rdonly(sb))
2035e776 5925 return 1;
e2b911c5 5926 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5927 return 0;
5928 return 1;
5929}
24b58424
TT		 5930#else
5931static inline void register_as_ext2(void) { }
5932static inline void unregister_as_ext2(void) { }
2035e776 5933static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5934#endif
5935
24b58424
TT		 5936static inline void register_as_ext3(void)
5937{
5938 int err = register_filesystem(&ext3_fs_type);
5939 if (err)
5940 printk(KERN_WARNING
5941 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5942}
5943
5944static inline void unregister_as_ext3(void)
5945{
5946 unregister_filesystem(&ext3_fs_type);
5947}
2035e776
TT		 5948
5949static inline int ext3_feature_set_ok(struct super_block *sb)
5950{
e2b911c5 5951 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5952 return 0;
e2b911c5 5953 if (!ext4_has_feature_journal(sb))
2035e776 5954 return 0;
bc98a42c 5955 if (sb_rdonly(sb))
2035e776 5956 return 1;
e2b911c5 5957 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5958 return 0;
5959 return 1;
5960}
24b58424 5961
03010a33
TT		 5962static struct file_system_type ext4_fs_type = {
5963 .owner = THIS_MODULE,
5964 .name = "ext4",
152a0836 5965 .mount = ext4_mount,
03010a33 5966 .kill_sb = kill_block_super,
78a8da10 5967 .fs_flags = FS_REQUIRES_DEV | FS_USERNS_MOUNT,
03010a33 5968};
7f78e035 5969MODULE_ALIAS_FS("ext4");
03010a33 5970
e9e3bcec
ES		 5971/* Shared across all ext4 file systems */
5972wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 5973
5dabfc78 5974static int __init ext4_init_fs(void)
ac27a0ec 5975{
e9e3bcec 5976 int i, err;
c9de560d 5977
e294a537 5978 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5979 ext4_li_info = NULL;
5980 mutex_init(&ext4_li_mtx);
5981
9a4c8019 5982 /* Build-time check for flags consistency */
12e9b892 5983 ext4_check_flag_values();
e9e3bcec 5984
e142d052 5985 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 5986 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 5987
51865fda 5988 err = ext4_init_es();
6fd058f7
TT		 5989 if (err)
5990 return err;
51865fda
ZL		 5991
5992 err = ext4_init_pageio();
5993 if (err)
b5799018 5994 goto out5;
51865fda 5995
5dabfc78 5996 err = ext4_init_system_zone();
bd2d0210 5997 if (err)
b5799018 5998 goto out4;
857ac889 5999
b5799018 6000 err = ext4_init_sysfs();
dd68314c 6001 if (err)
b5799018 6002 goto out3;
857ac889 6003
5dabfc78 6004 err = ext4_init_mballoc();
c9de560d
AT		 6005 if (err)
6006 goto out2;
ac27a0ec
DK		 6007 err = init_inodecache();
6008 if (err)
6009 goto out1;
24b58424 6010 register_as_ext3();
2035e776 6011 register_as_ext2();
03010a33 6012 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 6013 if (err)
6014 goto out;
bfff6873 6015
ac27a0ec
DK		 6016 return 0;
6017out:
24b58424
TT		 6018 unregister_as_ext2();
6019 unregister_as_ext3();
ac27a0ec
DK		 6020 destroy_inodecache();
6021out1:
5dabfc78 6022 ext4_exit_mballoc();
9c191f70 6023out2:
b5799018
TT		 6024 ext4_exit_sysfs();
6025out3:
5dabfc78 6026 ext4_exit_system_zone();
b5799018 6027out4:
5dabfc78 6028 ext4_exit_pageio();
b5799018 6029out5:
51865fda
ZL		 6030 ext4_exit_es();
6031
ac27a0ec
DK		 6032 return err;
6033}
6034
5dabfc78 6035static void __exit ext4_exit_fs(void)
ac27a0ec 6036{
bfff6873 6037 ext4_destroy_lazyinit_thread();
24b58424
TT		 6038 unregister_as_ext2();
6039 unregister_as_ext3();
03010a33 6040 unregister_filesystem(&ext4_fs_type);
ac27a0ec 6041 destroy_inodecache();
5dabfc78 6042 ext4_exit_mballoc();
b5799018 6043 ext4_exit_sysfs();
5dabfc78
TT		 6044 ext4_exit_system_zone();
6045 ext4_exit_pageio();
dd12ed14 6046 ext4_exit_es();
ac27a0ec
DK		 6047}
6048
6049MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 6050MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 6051MODULE_LICENSE("GPL");
7e547be9 6052MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 6053module_init(ext4_init_fs)
6054module_exit(ext4_exit_fs)
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