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ext4: store checksum seed in superblock
[thirdparty/kernel/linux.git] / fs / ext4 / super.c
CommitLineData
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>
7abc52c2 40#include <linux/cleancache.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
bfff6873
LC		 43#include <linux/kthread.h>
44#include <linux/freezer.h>
45
3dcf5451 46#include "ext4.h"
4a092d73 47#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
0b75a840
LC		 56static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
9c191f70 58static int ext4_mballoc_ready;
e294a537 59static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 60
617ba13b 61static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 62 unsigned long journal_devnum);
2adf6da8 63static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 64static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 65static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
617ba13b 69static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 70static int ext4_remount(struct super_block *sb, int *flags, char *data);
71static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 72static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 73static int ext4_freeze(struct super_block *sb);
152a0836
AV		 74static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
75 const char *dev_name, void *data);
2035e776
TT		 76static inline int ext2_feature_set_ok(struct super_block *sb);
77static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 78static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 79static void ext4_destroy_lazyinit_thread(void);
80static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 81static void ext4_clear_request_list(void);
ac27a0ec 82
c290ea01 83#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 84static struct file_system_type ext2_fs_type = {
85 .owner = THIS_MODULE,
86 .name = "ext2",
87 .mount = ext4_mount,
88 .kill_sb = kill_block_super,
89 .fs_flags = FS_REQUIRES_DEV,
90};
7f78e035 91MODULE_ALIAS_FS("ext2");
fa7614dd 92MODULE_ALIAS("ext2");
2035e776
TT		 93#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
94#else
95#define IS_EXT2_SB(sb) (0)
96#endif
97
98
ba69f9ab
JK		 99static struct file_system_type ext3_fs_type = {
100 .owner = THIS_MODULE,
101 .name = "ext3",
152a0836 102 .mount = ext4_mount,
ba69f9ab
JK		 103 .kill_sb = kill_block_super,
104 .fs_flags = FS_REQUIRES_DEV,
105};
7f78e035 106MODULE_ALIAS_FS("ext3");
fa7614dd 107MODULE_ALIAS("ext3");
ba69f9ab 108#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 109
d25425f8
DW		 110static int ext4_verify_csum_type(struct super_block *sb,
111 struct ext4_super_block *es)
112{
113 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
114 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
115 return 1;
116
117 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
118}
119
a9c47317
DW		 120static __le32 ext4_superblock_csum(struct super_block *sb,
121 struct ext4_super_block *es)
122{
123 struct ext4_sb_info *sbi = EXT4_SB(sb);
124 int offset = offsetof(struct ext4_super_block, s_checksum);
125 __u32 csum;
126
127 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
128
129 return cpu_to_le32(csum);
130}
131
c197855e
SH		 132static int ext4_superblock_csum_verify(struct super_block *sb,
133 struct ext4_super_block *es)
a9c47317 134{
9aa5d32b 135 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 136 return 1;
137
138 return es->s_checksum == ext4_superblock_csum(sb, es);
139}
140
06db49e6 141void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 142{
06db49e6
TT		 143 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
144
9aa5d32b 145 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 146 return;
147
148 es->s_checksum = ext4_superblock_csum(sb, es);
149}
150
9933fc0a
TT		 151void *ext4_kvmalloc(size_t size, gfp_t flags)
152{
153 void *ret;
154
8be04b93 155 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 156 if (!ret)
157 ret = __vmalloc(size, flags, PAGE_KERNEL);
158 return ret;
159}
160
161void *ext4_kvzalloc(size_t size, gfp_t flags)
162{
163 void *ret;
164
8be04b93 165 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 166 if (!ret)
167 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
168 return ret;
169}
170
8fadc143
AR		 171ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
172 struct ext4_group_desc *bg)
bd81d8ee 173{
3a14589c 174 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 175 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 176 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 177}
178
8fadc143
AR		 179ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
180 struct ext4_group_desc *bg)
bd81d8ee 181{
5272f837 182 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 183 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 184 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 185}
186
8fadc143
AR		 187ext4_fsblk_t ext4_inode_table(struct super_block *sb,
188 struct ext4_group_desc *bg)
bd81d8ee 189{
5272f837 190 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 191 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 192 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 193}
194
021b65bb
TT		 195__u32 ext4_free_group_clusters(struct super_block *sb,
196 struct ext4_group_desc *bg)
560671a0
AK		 197{
198 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
199 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 200 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 201}
202
203__u32 ext4_free_inodes_count(struct super_block *sb,
204 struct ext4_group_desc *bg)
205{
206 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
207 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 208 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 209}
210
211__u32 ext4_used_dirs_count(struct super_block *sb,
212 struct ext4_group_desc *bg)
213{
214 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
215 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 216 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 217}
218
219__u32 ext4_itable_unused_count(struct super_block *sb,
220 struct ext4_group_desc *bg)
221{
222 return le16_to_cpu(bg->bg_itable_unused_lo) |
223 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 224 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 225}
226
8fadc143
AR		 227void ext4_block_bitmap_set(struct super_block *sb,
228 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 229{
3a14589c 230 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 231 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
232 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 233}
234
8fadc143
AR		 235void ext4_inode_bitmap_set(struct super_block *sb,
236 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 237{
5272f837 238 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 239 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
240 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 241}
242
8fadc143
AR		 243void ext4_inode_table_set(struct super_block *sb,
244 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 245{
5272f837 246 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 247 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
248 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 249}
250
021b65bb
TT		 251void ext4_free_group_clusters_set(struct super_block *sb,
252 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 253{
254 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
255 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
256 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
257}
258
259void ext4_free_inodes_set(struct super_block *sb,
260 struct ext4_group_desc *bg, __u32 count)
261{
262 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
263 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
264 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
265}
266
267void ext4_used_dirs_set(struct super_block *sb,
268 struct ext4_group_desc *bg, __u32 count)
269{
270 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
271 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
272 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
273}
274
275void ext4_itable_unused_set(struct super_block *sb,
276 struct ext4_group_desc *bg, __u32 count)
277{
278 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
279 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
280 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
281}
282
d3d1faf6 283
1c13d5c0
TT		 284static void __save_error_info(struct super_block *sb, const char *func,
285 unsigned int line)
286{
287 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
288
289 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 290 if (bdev_read_only(sb->s_bdev))
291 return;
1c13d5c0
TT		 292 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
293 es->s_last_error_time = cpu_to_le32(get_seconds());
294 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
295 es->s_last_error_line = cpu_to_le32(line);
296 if (!es->s_first_error_time) {
297 es->s_first_error_time = es->s_last_error_time;
298 strncpy(es->s_first_error_func, func,
299 sizeof(es->s_first_error_func));
300 es->s_first_error_line = cpu_to_le32(line);
301 es->s_first_error_ino = es->s_last_error_ino;
302 es->s_first_error_block = es->s_last_error_block;
303 }
66e61a9e
TT		 304 /*
305 * Start the daily error reporting function if it hasn't been
306 * started already
307 */
308 if (!es->s_error_count)
309 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 310 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 311}
312
313static void save_error_info(struct super_block *sb, const char *func,
314 unsigned int line)
315{
316 __save_error_info(sb, func, line);
317 ext4_commit_super(sb, 1);
318}
319
bdfe0cbd
TT		 320/*
321 * The del_gendisk() function uninitializes the disk-specific data
322 * structures, including the bdi structure, without telling anyone
323 * else. Once this happens, any attempt to call mark_buffer_dirty()
324 * (for example, by ext4_commit_super), will cause a kernel OOPS.
325 * This is a kludge to prevent these oops until we can put in a proper
326 * hook in del_gendisk() to inform the VFS and file system layers.
327 */
328static int block_device_ejected(struct super_block *sb)
329{
330 struct inode *bd_inode = sb->s_bdev->bd_inode;
331 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
332
333 return bdi->dev == NULL;
334}
335
18aadd47
BJ		 336static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
337{
338 struct super_block *sb = journal->j_private;
339 struct ext4_sb_info *sbi = EXT4_SB(sb);
340 int error = is_journal_aborted(journal);
5d3ee208 341 struct ext4_journal_cb_entry *jce;
18aadd47 342
5d3ee208 343 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 344 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 345 while (!list_empty(&txn->t_private_list)) {
346 jce = list_entry(txn->t_private_list.next,
347 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 348 list_del_init(&jce->jce_list);
349 spin_unlock(&sbi->s_md_lock);
350 jce->jce_func(sb, jce, error);
351 spin_lock(&sbi->s_md_lock);
352 }
353 spin_unlock(&sbi->s_md_lock);
354}
1c13d5c0 355
ac27a0ec
DK		 356/* Deal with the reporting of failure conditions on a filesystem such as
357 * inconsistencies detected or read IO failures.
358 *
359 * On ext2, we can store the error state of the filesystem in the
617ba13b 360 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 361 * write ordering constraints on the superblock which prevent us from
362 * writing it out straight away; and given that the journal is about to
363 * be aborted, we can't rely on the current, or future, transactions to
364 * write out the superblock safely.
365 *
dab291af 366 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 367 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 368 * that error until we've noted it down and cleared it.
369 */
370
617ba13b 371static void ext4_handle_error(struct super_block *sb)
ac27a0ec 372{
ac27a0ec
DK		 373 if (sb->s_flags & MS_RDONLY)
374 return;
375
2b2d6d01 376 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 377 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 378
4ab2f15b 379 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 380 if (journal)
dab291af 381 jbd2_journal_abort(journal, -EIO);
ac27a0ec 382 }
2b2d6d01 383 if (test_opt(sb, ERRORS_RO)) {
b31e1552 384 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 385 /*
386 * Make sure updated value of ->s_mount_flags will be visible
387 * before ->s_flags update
388 */
389 smp_wmb();
ac27a0ec
DK		 390 sb->s_flags |= MS_RDONLY;
391 }
ac27a0ec 392 if (test_opt(sb, ERRORS_PANIC))
617ba13b 393 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 394 sb->s_id);
395}
396
efbed4dc
TT		 397#define ext4_error_ratelimit(sb) \
398 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
399 "EXT4-fs error")
400
12062ddd 401void __ext4_error(struct super_block *sb, const char *function,
c398eda0 402 unsigned int line, const char *fmt, ...)
ac27a0ec 403{
0ff2ea7d 404 struct va_format vaf;
ac27a0ec
DK		 405 va_list args;
406
efbed4dc
TT		 407 if (ext4_error_ratelimit(sb)) {
408 va_start(args, fmt);
409 vaf.fmt = fmt;
410 vaf.va = &args;
411 printk(KERN_CRIT
412 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
413 sb->s_id, function, line, current->comm, &vaf);
414 va_end(args);
415 }
f3fc0210 416 save_error_info(sb, function, line);
617ba13b 417 ext4_handle_error(sb);
ac27a0ec
DK		 418}
419
e7c96e8e
JP		 420void __ext4_error_inode(struct inode *inode, const char *function,
421 unsigned int line, ext4_fsblk_t block,
422 const char *fmt, ...)
273df556
FM		 423{
424 va_list args;
f7c21177 425 struct va_format vaf;
1c13d5c0 426 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 427
1c13d5c0
TT		 428 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
429 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 430 if (ext4_error_ratelimit(inode->i_sb)) {
431 va_start(args, fmt);
432 vaf.fmt = fmt;
433 vaf.va = &args;
434 if (block)
435 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
436 "inode #%lu: block %llu: comm %s: %pV\n",
437 inode->i_sb->s_id, function, line, inode->i_ino,
438 block, current->comm, &vaf);
439 else
440 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
441 "inode #%lu: comm %s: %pV\n",
442 inode->i_sb->s_id, function, line, inode->i_ino,
443 current->comm, &vaf);
444 va_end(args);
445 }
1c13d5c0 446 save_error_info(inode->i_sb, function, line);
273df556
FM		 447 ext4_handle_error(inode->i_sb);
448}
449
e7c96e8e
JP		 450void __ext4_error_file(struct file *file, const char *function,
451 unsigned int line, ext4_fsblk_t block,
452 const char *fmt, ...)
273df556
FM		 453{
454 va_list args;
f7c21177 455 struct va_format vaf;
1c13d5c0 456 struct ext4_super_block *es;
496ad9aa 457 struct inode *inode = file_inode(file);
273df556
FM		 458 char pathname[80], *path;
459
1c13d5c0
TT		 460 es = EXT4_SB(inode->i_sb)->s_es;
461 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 462 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 463 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 464 if (IS_ERR(path))
465 path = "(unknown)";
466 va_start(args, fmt);
467 vaf.fmt = fmt;
468 vaf.va = &args;
469 if (block)
470 printk(KERN_CRIT
471 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
472 "block %llu: comm %s: path %s: %pV\n",
473 inode->i_sb->s_id, function, line, inode->i_ino,
474 block, current->comm, path, &vaf);
475 else
476 printk(KERN_CRIT
477 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
478 "comm %s: path %s: %pV\n",
479 inode->i_sb->s_id, function, line, inode->i_ino,
480 current->comm, path, &vaf);
481 va_end(args);
482 }
1c13d5c0 483 save_error_info(inode->i_sb, function, line);
273df556
FM		 484 ext4_handle_error(inode->i_sb);
485}
486
722887dd
TT		 487const char *ext4_decode_error(struct super_block *sb, int errno,
488 char nbuf[16])
ac27a0ec
DK		 489{
490 char *errstr = NULL;
491
492 switch (errno) {
493 case -EIO:
494 errstr = "IO failure";
495 break;
496 case -ENOMEM:
497 errstr = "Out of memory";
498 break;
499 case -EROFS:
78f1ddbb
TT		 500 if (!sb || (EXT4_SB(sb)->s_journal &&
501 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 502 errstr = "Journal has aborted";
503 else
504 errstr = "Readonly filesystem";
505 break;
506 default:
507 /* If the caller passed in an extra buffer for unknown
508 * errors, textualise them now. Else we just return
509 * NULL. */
510 if (nbuf) {
511 /* Check for truncated error codes... */
512 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
513 errstr = nbuf;
514 }
515 break;
516 }
517
518 return errstr;
519}
520
617ba13b 521/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 522 * automatically and invokes the appropriate error response. */
523
c398eda0
TT		 524void __ext4_std_error(struct super_block *sb, const char *function,
525 unsigned int line, int errno)
ac27a0ec
DK		 526{
527 char nbuf[16];
528 const char *errstr;
529
530 /* Special case: if the error is EROFS, and we're not already
531 * inside a transaction, then there's really no point in logging
532 * an error. */
533 if (errno == -EROFS && journal_current_handle() == NULL &&
534 (sb->s_flags & MS_RDONLY))
535 return;
536
efbed4dc
TT		 537 if (ext4_error_ratelimit(sb)) {
538 errstr = ext4_decode_error(sb, errno, nbuf);
539 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
540 sb->s_id, function, line, errstr);
541 }
ac27a0ec 542
efbed4dc 543 save_error_info(sb, function, line);
617ba13b 544 ext4_handle_error(sb);
ac27a0ec
DK		 545}
546
547/*
617ba13b 548 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 549 * abort function may be used to deal with unrecoverable failures such
550 * as journal IO errors or ENOMEM at a critical moment in log management.
551 *
552 * We unconditionally force the filesystem into an ABORT|READONLY state,
553 * unless the error response on the fs has been set to panic in which
554 * case we take the easy way out and panic immediately.
555 */
556
c67d859e 557void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 558 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 559{
560 va_list args;
561
1c13d5c0 562 save_error_info(sb, function, line);
ac27a0ec 563 va_start(args, fmt);
c398eda0
TT		 564 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
565 function, line);
ac27a0ec
DK		 566 vprintk(fmt, args);
567 printk("\n");
568 va_end(args);
569
1c13d5c0
TT		 570 if ((sb->s_flags & MS_RDONLY) == 0) {
571 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 572 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 573 /*
574 * Make sure updated value of ->s_mount_flags will be visible
575 * before ->s_flags update
576 */
577 smp_wmb();
578 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 579 if (EXT4_SB(sb)->s_journal)
580 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
581 save_error_info(sb, function, line);
582 }
ac27a0ec 583 if (test_opt(sb, ERRORS_PANIC))
617ba13b 584 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 585}
586
e7c96e8e
JP		 587void __ext4_msg(struct super_block *sb,
588 const char *prefix, const char *fmt, ...)
b31e1552 589{
0ff2ea7d 590 struct va_format vaf;
b31e1552
ES		 591 va_list args;
592
efbed4dc
TT		 593 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
594 return;
595
b31e1552 596 va_start(args, fmt);
0ff2ea7d
JP		 597 vaf.fmt = fmt;
598 vaf.va = &args;
599 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 600 va_end(args);
601}
602
b03a2f7e
AD		 603#define ext4_warning_ratelimit(sb) \
604 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
605 "EXT4-fs warning")
606
12062ddd 607void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 608 unsigned int line, const char *fmt, ...)
ac27a0ec 609{
0ff2ea7d 610 struct va_format vaf;
ac27a0ec
DK		 611 va_list args;
612
b03a2f7e 613 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 614 return;
615
ac27a0ec 616 va_start(args, fmt);
0ff2ea7d
JP		 617 vaf.fmt = fmt;
618 vaf.va = &args;
619 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
620 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 621 va_end(args);
622}
623
b03a2f7e
AD		 624void __ext4_warning_inode(const struct inode *inode, const char *function,
625 unsigned int line, const char *fmt, ...)
626{
627 struct va_format vaf;
628 va_list args;
629
630 if (!ext4_warning_ratelimit(inode->i_sb))
631 return;
632
633 va_start(args, fmt);
634 vaf.fmt = fmt;
635 vaf.va = &args;
636 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
637 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
638 function, line, inode->i_ino, current->comm, &vaf);
639 va_end(args);
640}
641
e29136f8
TT		 642void __ext4_grp_locked_error(const char *function, unsigned int line,
643 struct super_block *sb, ext4_group_t grp,
644 unsigned long ino, ext4_fsblk_t block,
645 const char *fmt, ...)
5d1b1b3f
AK		 646__releases(bitlock)
647__acquires(bitlock)
648{
0ff2ea7d 649 struct va_format vaf;
5d1b1b3f
AK		 650 va_list args;
651 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
652
1c13d5c0
TT		 653 es->s_last_error_ino = cpu_to_le32(ino);
654 es->s_last_error_block = cpu_to_le64(block);
655 __save_error_info(sb, function, line);
0ff2ea7d 656
efbed4dc
TT		 657 if (ext4_error_ratelimit(sb)) {
658 va_start(args, fmt);
659 vaf.fmt = fmt;
660 vaf.va = &args;
661 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
662 sb->s_id, function, line, grp);
663 if (ino)
664 printk(KERN_CONT "inode %lu: ", ino);
665 if (block)
666 printk(KERN_CONT "block %llu:",
667 (unsigned long long) block);
668 printk(KERN_CONT "%pV\n", &vaf);
669 va_end(args);
670 }
5d1b1b3f
AK		 671
672 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 673 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 674 return;
675 }
1c13d5c0 676
5d1b1b3f
AK		 677 ext4_unlock_group(sb, grp);
678 ext4_handle_error(sb);
679 /*
680 * We only get here in the ERRORS_RO case; relocking the group
681 * may be dangerous, but nothing bad will happen since the
682 * filesystem will have already been marked read/only and the
683 * journal has been aborted. We return 1 as a hint to callers
684 * who might what to use the return value from
25985edc 685 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 686 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
687 * aggressively from the ext4 function in question, with a
688 * more appropriate error code.
689 */
690 ext4_lock_group(sb, grp);
691 return;
692}
693
617ba13b 694void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 695{
617ba13b 696 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 697
617ba13b 698 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 699 return;
700
12062ddd 701 ext4_warning(sb,
ac27a0ec
DK		 702 "updating to rev %d because of new feature flag, "
703 "running e2fsck is recommended",
617ba13b 704 EXT4_DYNAMIC_REV);
ac27a0ec 705
617ba13b
MC		 706 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
707 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
708 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 709 /* leave es->s_feature_*compat flags alone */
710 /* es->s_uuid will be set by e2fsck if empty */
711
712 /*
713 * The rest of the superblock fields should be zero, and if not it
714 * means they are likely already in use, so leave them alone. We
715 * can leave it up to e2fsck to clean up any inconsistencies there.
716 */
717}
718
719/*
720 * Open the external journal device
721 */
b31e1552 722static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 723{
724 struct block_device *bdev;
725 char b[BDEVNAME_SIZE];
726
d4d77629 727 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 728 if (IS_ERR(bdev))
729 goto fail;
730 return bdev;
731
732fail:
b31e1552 733 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 734 __bdevname(dev, b), PTR_ERR(bdev));
735 return NULL;
736}
737
738/*
739 * Release the journal device
740 */
4385bab1 741static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 742{
4385bab1 743 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 744}
745
4385bab1 746static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 747{
748 struct block_device *bdev;
ac27a0ec
DK		 749 bdev = sbi->journal_bdev;
750 if (bdev) {
4385bab1 751 ext4_blkdev_put(bdev);
ac27a0ec
DK		 752 sbi->journal_bdev = NULL;
753 }
ac27a0ec
DK		 754}
755
756static inline struct inode *orphan_list_entry(struct list_head *l)
757{
617ba13b 758 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 759}
760
617ba13b 761static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 762{
763 struct list_head *l;
764
b31e1552
ES		 765 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
766 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 767
768 printk(KERN_ERR "sb_info orphan list:\n");
769 list_for_each(l, &sbi->s_orphan) {
770 struct inode *inode = orphan_list_entry(l);
771 printk(KERN_ERR " "
772 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
773 inode->i_sb->s_id, inode->i_ino, inode,
774 inode->i_mode, inode->i_nlink,
775 NEXT_ORPHAN(inode));
776 }
777}
778
2b2d6d01 779static void ext4_put_super(struct super_block *sb)
ac27a0ec 780{
617ba13b
MC		 781 struct ext4_sb_info *sbi = EXT4_SB(sb);
782 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 783 int i, err;
ac27a0ec 784
857ac889 785 ext4_unregister_li_request(sb);
e0ccfd95
CH		 786 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
787
2e8fa54e 788 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 789 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 790
0390131b
FM		 791 if (sbi->s_journal) {
792 err = jbd2_journal_destroy(sbi->s_journal);
793 sbi->s_journal = NULL;
794 if (err < 0)
c67d859e 795 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 796 }
d4edac31 797
ebd173be 798 ext4_unregister_sysfs(sb);
d3922a77 799 ext4_es_unregister_shrinker(sbi);
9105bb14 800 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 801 ext4_release_system_zone(sb);
802 ext4_mb_release(sb);
803 ext4_ext_release(sb);
804 ext4_xattr_put_super(sb);
805
ac27a0ec 806 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 807 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 808 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 809 }
58c5873a 810 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 811 ext4_commit_super(sb, 1);
812
ac27a0ec
DK		 813 for (i = 0; i < sbi->s_gdb_count; i++)
814 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 815 kvfree(sbi->s_group_desc);
816 kvfree(sbi->s_flex_groups);
57042651 817 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 818 percpu_counter_destroy(&sbi->s_freeinodes_counter);
819 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 820 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 821 brelse(sbi->s_sbh);
822#ifdef CONFIG_QUOTA
a2d4a646 823 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 824 kfree(sbi->s_qf_names[i]);
825#endif
826
827 /* Debugging code just in case the in-memory inode orphan list
828 * isn't empty. The on-disk one can be non-empty if we've
829 * detected an error and taken the fs readonly, but the
830 * in-memory list had better be clean by this point. */
831 if (!list_empty(&sbi->s_orphan))
832 dump_orphan_list(sb, sbi);
833 J_ASSERT(list_empty(&sbi->s_orphan));
834
89d96a6f 835 sync_blockdev(sb->s_bdev);
f98393a6 836 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 837 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
838 /*
839 * Invalidate the journal device's buffers. We don't want them
840 * floating about in memory - the physical journal device may
841 * hotswapped, and it breaks the `ro-after' testing code.
842 */
843 sync_blockdev(sbi->journal_bdev);
f98393a6 844 invalidate_bdev(sbi->journal_bdev);
617ba13b 845 ext4_blkdev_remove(sbi);
ac27a0ec 846 }
9c191f70
M		 847 if (sbi->s_mb_cache) {
848 ext4_xattr_destroy_cache(sbi->s_mb_cache);
849 sbi->s_mb_cache = NULL;
850 }
c5e06d10
JL		 851 if (sbi->s_mmp_tsk)
852 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 853 sb->s_fs_info = NULL;
3197ebdb
TT		 854 /*
855 * Now that we are completely done shutting down the
856 * superblock, we need to actually destroy the kobject.
857 */
3197ebdb
TT		 858 kobject_put(&sbi->s_kobj);
859 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 860 if (sbi->s_chksum_driver)
861 crypto_free_shash(sbi->s_chksum_driver);
705895b6 862 kfree(sbi->s_blockgroup_lock);
ac27a0ec 863 kfree(sbi);
ac27a0ec
DK		 864}
865
e18b890b 866static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 867
868/*
869 * Called inside transaction, so use GFP_NOFS
870 */
617ba13b 871static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 872{
617ba13b 873 struct ext4_inode_info *ei;
ac27a0ec 874
e6b4f8da 875 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 876 if (!ei)
877 return NULL;
0b8e58a1 878
ac27a0ec 879 ei->vfs_inode.i_version = 1;
202ee5df 880 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 881 INIT_LIST_HEAD(&ei->i_prealloc_list);
882 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 883 ext4_es_init_tree(&ei->i_es_tree);
884 rwlock_init(&ei->i_es_lock);
edaa53ca 885 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 886 ei->i_es_all_nr = 0;
edaa53ca 887 ei->i_es_shk_nr = 0;
dd475925 888 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 889 ei->i_reserved_data_blocks = 0;
890 ei->i_reserved_meta_blocks = 0;
891 ei->i_allocated_meta_blocks = 0;
9d0be502 892 ei->i_da_metadata_calc_len = 0;
7e731bc9 893 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 894 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 895#ifdef CONFIG_QUOTA
896 ei->i_reserved_quota = 0;
96c7e0d9 897 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 898#endif
8aefcd55 899 ei->jinode = NULL;
2e8fa54e 900 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 901 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 902 ei->i_sync_tid = 0;
903 ei->i_datasync_tid = 0;
f7ad6d2e 904 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 905 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 906 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
b30ab0e0 907#ifdef CONFIG_EXT4_FS_ENCRYPTION
b7236e21 908 ei->i_crypt_info = NULL;
b30ab0e0 909#endif
ac27a0ec
DK		 910 return &ei->vfs_inode;
911}
912
7ff9c073
TT		 913static int ext4_drop_inode(struct inode *inode)
914{
915 int drop = generic_drop_inode(inode);
916
917 trace_ext4_drop_inode(inode, drop);
918 return drop;
919}
920
fa0d7e3d
NP		 921static void ext4_i_callback(struct rcu_head *head)
922{
923 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 924 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
925}
926
617ba13b 927static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 928{
9f7dd93d 929 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 930 ext4_msg(inode->i_sb, KERN_ERR,
931 "Inode %lu (%p): orphan list check failed!",
932 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 933 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
934 EXT4_I(inode), sizeof(struct ext4_inode_info),
935 true);
936 dump_stack();
937 }
fa0d7e3d 938 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 939}
940
51cc5068 941static void init_once(void *foo)
ac27a0ec 942{
617ba13b 943 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 944
a35afb83 945 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 946 init_rwsem(&ei->xattr_sem);
0e855ac8 947 init_rwsem(&ei->i_data_sem);
a35afb83 948 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 949}
950
e67bc2b3 951static int __init init_inodecache(void)
ac27a0ec 952{
617ba13b
MC		 953 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
954 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 955 0, (SLAB_RECLAIM_ACCOUNT|
956 SLAB_MEM_SPREAD),
20c2df83 957 init_once);
617ba13b 958 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 959 return -ENOMEM;
960 return 0;
961}
962
963static void destroy_inodecache(void)
964{
8c0a8537
KS		 965 /*
966 * Make sure all delayed rcu free inodes are flushed before we
967 * destroy cache.
968 */
969 rcu_barrier();
617ba13b 970 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 971}
972
0930fcc1 973void ext4_clear_inode(struct inode *inode)
ac27a0ec 974{
0930fcc1 975 invalidate_inode_buffers(inode);
dbd5768f 976 clear_inode(inode);
9f754758 977 dquot_drop(inode);
c2ea3fde 978 ext4_discard_preallocations(inode);
51865fda 979 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 980 if (EXT4_I(inode)->jinode) {
981 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
982 EXT4_I(inode)->jinode);
983 jbd2_free_inode(EXT4_I(inode)->jinode);
984 EXT4_I(inode)->jinode = NULL;
985 }
b7236e21
TT		 986#ifdef CONFIG_EXT4_FS_ENCRYPTION
987 if (EXT4_I(inode)->i_crypt_info)
c936e1ec 988 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
b7236e21 989#endif
ac27a0ec
DK		 990}
991
1b961ac0 992static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 993 u64 ino, u32 generation)
ac27a0ec 994{
ac27a0ec 995 struct inode *inode;
ac27a0ec 996
617ba13b 997 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 998 return ERR_PTR(-ESTALE);
617ba13b 999 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1000 return ERR_PTR(-ESTALE);
1001
1002 /* iget isn't really right if the inode is currently unallocated!!
1003 *
617ba13b 1004 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1005 * deleted, so we should be safe.
1006 *
1007 * Currently we don't know the generation for parent directory, so
1008 * a generation of 0 means "accept any"
1009 */
f4bb2981 1010 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1011 if (IS_ERR(inode))
1012 return ERR_CAST(inode);
1013 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1014 iput(inode);
1015 return ERR_PTR(-ESTALE);
1016 }
1b961ac0
CH		 1017
1018 return inode;
1019}
1020
1021static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1022 int fh_len, int fh_type)
1b961ac0
CH		 1023{
1024 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1025 ext4_nfs_get_inode);
1026}
1027
1028static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1029 int fh_len, int fh_type)
1b961ac0
CH		 1030{
1031 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1032 ext4_nfs_get_inode);
ac27a0ec
DK		 1033}
1034
c39a7f84
TO		 1035/*
1036 * Try to release metadata pages (indirect blocks, directories) which are
1037 * mapped via the block device. Since these pages could have journal heads
1038 * which would prevent try_to_free_buffers() from freeing them, we must use
1039 * jbd2 layer's try_to_free_buffers() function to release them.
1040 */
0b8e58a1
AD		 1041static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1042 gfp_t wait)
c39a7f84
TO		 1043{
1044 journal_t *journal = EXT4_SB(sb)->s_journal;
1045
1046 WARN_ON(PageChecked(page));
1047 if (!page_has_buffers(page))
1048 return 0;
1049 if (journal)
1050 return jbd2_journal_try_to_free_buffers(journal, page,
1051 wait & ~__GFP_WAIT);
1052 return try_to_free_buffers(page);
1053}
1054
ac27a0ec 1055#ifdef CONFIG_QUOTA
af5bc92d 1056#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1057#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1058
617ba13b
MC		 1059static int ext4_write_dquot(struct dquot *dquot);
1060static int ext4_acquire_dquot(struct dquot *dquot);
1061static int ext4_release_dquot(struct dquot *dquot);
1062static int ext4_mark_dquot_dirty(struct dquot *dquot);
1063static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1064static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1065 struct path *path);
ca0e05e4 1066static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1067static int ext4_quota_on_mount(struct super_block *sb, int type);
1068static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1069 size_t len, loff_t off);
617ba13b 1070static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1071 const char *data, size_t len, loff_t off);
7c319d32
AK		 1072static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1073 unsigned int flags);
1074static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1075
96c7e0d9
JK		 1076static struct dquot **ext4_get_dquots(struct inode *inode)
1077{
1078 return EXT4_I(inode)->i_dquot;
1079}
1080
61e225dc 1081static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1082 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1083 .write_dquot = ext4_write_dquot,
1084 .acquire_dquot = ext4_acquire_dquot,
1085 .release_dquot = ext4_release_dquot,
1086 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1087 .write_info = ext4_write_info,
1088 .alloc_dquot = dquot_alloc,
1089 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1090};
1091
0d54b217 1092static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1093 .quota_on = ext4_quota_on,
ca0e05e4 1094 .quota_off = ext4_quota_off,
287a8095 1095 .quota_sync = dquot_quota_sync,
0a240339 1096 .get_state = dquot_get_state,
287a8095
CH		 1097 .set_info = dquot_set_dqinfo,
1098 .get_dqblk = dquot_get_dqblk,
1099 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1100};
1101#endif
1102
ee9b6d61 1103static const struct super_operations ext4_sops = {
617ba13b
MC		 1104 .alloc_inode = ext4_alloc_inode,
1105 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1106 .write_inode = ext4_write_inode,
1107 .dirty_inode = ext4_dirty_inode,
7ff9c073 1108 .drop_inode = ext4_drop_inode,
0930fcc1 1109 .evict_inode = ext4_evict_inode,
617ba13b 1110 .put_super = ext4_put_super,
617ba13b 1111 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1112 .freeze_fs = ext4_freeze,
1113 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1114 .statfs = ext4_statfs,
1115 .remount_fs = ext4_remount,
617ba13b 1116 .show_options = ext4_show_options,
ac27a0ec 1117#ifdef CONFIG_QUOTA
617ba13b
MC		 1118 .quota_read = ext4_quota_read,
1119 .quota_write = ext4_quota_write,
96c7e0d9 1120 .get_dquots = ext4_get_dquots,
ac27a0ec 1121#endif
c39a7f84 1122 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1123};
1124
39655164 1125static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1126 .fh_to_dentry = ext4_fh_to_dentry,
1127 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1128 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1129};
1130
1131enum {
1132 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1133 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1134 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1135 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1136 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1137 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1138 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1139 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1140 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1141 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1142 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1143 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1144 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1145 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1146 Opt_lazytime, Opt_nolazytime,
1449032b 1147 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1148 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1149 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1150 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1151 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1152};
1153
a447c093 1154static const match_table_t tokens = {
ac27a0ec
DK		 1155 {Opt_bsd_df, "bsddf"},
1156 {Opt_minix_df, "minixdf"},
1157 {Opt_grpid, "grpid"},
1158 {Opt_grpid, "bsdgroups"},
1159 {Opt_nogrpid, "nogrpid"},
1160 {Opt_nogrpid, "sysvgroups"},
1161 {Opt_resgid, "resgid=%u"},
1162 {Opt_resuid, "resuid=%u"},
1163 {Opt_sb, "sb=%u"},
1164 {Opt_err_cont, "errors=continue"},
1165 {Opt_err_panic, "errors=panic"},
1166 {Opt_err_ro, "errors=remount-ro"},
1167 {Opt_nouid32, "nouid32"},
ac27a0ec 1168 {Opt_debug, "debug"},
72578c33
TT		 1169 {Opt_removed, "oldalloc"},
1170 {Opt_removed, "orlov"},
ac27a0ec
DK		 1171 {Opt_user_xattr, "user_xattr"},
1172 {Opt_nouser_xattr, "nouser_xattr"},
1173 {Opt_acl, "acl"},
1174 {Opt_noacl, "noacl"},
e3bb52ae 1175 {Opt_noload, "norecovery"},
5a916be1 1176 {Opt_noload, "noload"},
72578c33
TT		 1177 {Opt_removed, "nobh"},
1178 {Opt_removed, "bh"},
ac27a0ec 1179 {Opt_commit, "commit=%u"},
30773840
TT		 1180 {Opt_min_batch_time, "min_batch_time=%u"},
1181 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1182 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1183 {Opt_journal_path, "journal_path=%s"},
818d276c 1184 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1185 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1186 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1187 {Opt_abort, "abort"},
1188 {Opt_data_journal, "data=journal"},
1189 {Opt_data_ordered, "data=ordered"},
1190 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1191 {Opt_data_err_abort, "data_err=abort"},
1192 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1193 {Opt_offusrjquota, "usrjquota="},
1194 {Opt_usrjquota, "usrjquota=%s"},
1195 {Opt_offgrpjquota, "grpjquota="},
1196 {Opt_grpjquota, "grpjquota=%s"},
1197 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1198 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1199 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1200 {Opt_grpquota, "grpquota"},
1201 {Opt_noquota, "noquota"},
1202 {Opt_quota, "quota"},
1203 {Opt_usrquota, "usrquota"},
1204 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1205 {Opt_barrier, "barrier"},
1206 {Opt_nobarrier, "nobarrier"},
25ec56b5 1207 {Opt_i_version, "i_version"},
923ae0ff 1208 {Opt_dax, "dax"},
c9de560d 1209 {Opt_stripe, "stripe=%u"},
64769240 1210 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1211 {Opt_lazytime, "lazytime"},
1212 {Opt_nolazytime, "nolazytime"},
dd919b98 1213 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1214 {Opt_removed, "mblk_io_submit"},
1215 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1216 {Opt_block_validity, "block_validity"},
1217 {Opt_noblock_validity, "noblock_validity"},
240799cd 1218 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1219 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1220 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1221 {Opt_auto_da_alloc, "auto_da_alloc"},
1222 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1223 {Opt_dioread_nolock, "dioread_nolock"},
1224 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1225 {Opt_discard, "discard"},
1226 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1227 {Opt_init_itable, "init_itable=%u"},
1228 {Opt_init_itable, "init_itable"},
1229 {Opt_noinit_itable, "noinit_itable"},
df981d03 1230 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1231 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1232 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1233 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1234 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1235 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1236 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1237 {Opt_err, NULL},
ac27a0ec
DK		 1238};
1239
617ba13b 1240static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1241{
617ba13b 1242 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1243 char *options = (char *) *data;
1244
1245 if (!options || strncmp(options, "sb=", 3) != 0)
1246 return 1; /* Default location */
0b8e58a1 1247
ac27a0ec 1248 options += 3;
0b8e58a1 1249 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1250 sb_block = simple_strtoul(options, &options, 0);
1251 if (*options && *options != ',') {
4776004f 1252 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1253 (char *) *data);
1254 return 1;
1255 }
1256 if (*options == ',')
1257 options++;
1258 *data = (void *) options;
0b8e58a1 1259
ac27a0ec
DK		 1260 return sb_block;
1261}
1262
b3881f74 1263#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1264static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1265 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1266
56c50f11
DM		 1267#ifdef CONFIG_QUOTA
1268static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1269{
1270 struct ext4_sb_info *sbi = EXT4_SB(sb);
1271 char *qname;
03dafb5f 1272 int ret = -1;
56c50f11
DM		 1273
1274 if (sb_any_quota_loaded(sb) &&
1275 !sbi->s_qf_names[qtype]) {
1276 ext4_msg(sb, KERN_ERR,
1277 "Cannot change journaled "
1278 "quota options when quota turned on");
57f73c2c 1279 return -1;
56c50f11 1280 }
262b4662
JK		 1281 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1282 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1283 "when QUOTA feature is enabled");
1284 return -1;
1285 }
56c50f11
DM		 1286 qname = match_strdup(args);
1287 if (!qname) {
1288 ext4_msg(sb, KERN_ERR,
1289 "Not enough memory for storing quotafile name");
57f73c2c 1290 return -1;
56c50f11 1291 }
03dafb5f
CG		 1292 if (sbi->s_qf_names[qtype]) {
1293 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1294 ret = 1;
1295 else
1296 ext4_msg(sb, KERN_ERR,
1297 "%s quota file already specified",
1298 QTYPE2NAME(qtype));
1299 goto errout;
56c50f11 1300 }
03dafb5f 1301 if (strchr(qname, '/')) {
56c50f11
DM		 1302 ext4_msg(sb, KERN_ERR,
1303 "quotafile must be on filesystem root");
03dafb5f 1304 goto errout;
56c50f11 1305 }
03dafb5f 1306 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1307 set_opt(sb, QUOTA);
56c50f11 1308 return 1;
03dafb5f
CG		 1309errout:
1310 kfree(qname);
1311 return ret;
56c50f11
DM		 1312}
1313
1314static int clear_qf_name(struct super_block *sb, int qtype)
1315{
1316
1317 struct ext4_sb_info *sbi = EXT4_SB(sb);
1318
1319 if (sb_any_quota_loaded(sb) &&
1320 sbi->s_qf_names[qtype]) {
1321 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1322 " when quota turned on");
57f73c2c 1323 return -1;
56c50f11 1324 }
03dafb5f 1325 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1326 sbi->s_qf_names[qtype] = NULL;
1327 return 1;
1328}
1329#endif
1330
26092bf5
TT		 1331#define MOPT_SET 0x0001
1332#define MOPT_CLEAR 0x0002
1333#define MOPT_NOSUPPORT 0x0004
1334#define MOPT_EXPLICIT 0x0008
1335#define MOPT_CLEAR_ERR 0x0010
1336#define MOPT_GTE0 0x0020
ac27a0ec 1337#ifdef CONFIG_QUOTA
26092bf5
TT		 1338#define MOPT_Q 0
1339#define MOPT_QFMT 0x0040
1340#else
1341#define MOPT_Q MOPT_NOSUPPORT
1342#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1343#endif
26092bf5 1344#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1345#define MOPT_NO_EXT2 0x0100
1346#define MOPT_NO_EXT3 0x0200
1347#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1348#define MOPT_STRING 0x0400
26092bf5
TT		 1349
1350static const struct mount_opts {
1351 int token;
1352 int mount_opt;
1353 int flags;
1354} ext4_mount_opts[] = {
1355 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1356 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1357 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1358 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1359 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1360 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1361 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1362 MOPT_EXT4_ONLY | MOPT_SET},
1363 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1364 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1365 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1366 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1367 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1368 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1369 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1370 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1371 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1372 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1373 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1374 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1375 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1376 EXT4_MOUNT_JOURNAL_CHECKSUM),
1377 MOPT_EXT4_ONLY | MOPT_SET},
1378 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1379 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1380 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1381 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1382 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1383 MOPT_NO_EXT2 | MOPT_SET},
1384 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1385 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1386 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1387 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1388 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1389 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1390 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1391 {Opt_commit, 0, MOPT_GTE0},
1392 {Opt_max_batch_time, 0, MOPT_GTE0},
1393 {Opt_min_batch_time, 0, MOPT_GTE0},
1394 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1395 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1396 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1397 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1398 {Opt_resuid, 0, MOPT_GTE0},
1399 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1400 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1401 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1402 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1403 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1404 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1405 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1406 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1407 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1408 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1409#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1410 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1411 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1412#else
26092bf5
TT		 1413 {Opt_acl, 0, MOPT_NOSUPPORT},
1414 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1415#endif
26092bf5
TT		 1416 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1417 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1418 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1419 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1420 MOPT_SET | MOPT_Q},
1421 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1422 MOPT_SET | MOPT_Q},
1423 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1424 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1425 {Opt_usrjquota, 0, MOPT_Q},
1426 {Opt_grpjquota, 0, MOPT_Q},
1427 {Opt_offusrjquota, 0, MOPT_Q},
1428 {Opt_offgrpjquota, 0, MOPT_Q},
1429 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1430 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1431 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1432 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1433 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1434 {Opt_err, 0, 0}
1435};
1436
1437static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1438 substring_t *args, unsigned long *journal_devnum,
1439 unsigned int *journal_ioprio, int is_remount)
1440{
1441 struct ext4_sb_info *sbi = EXT4_SB(sb);
1442 const struct mount_opts *m;
08cefc7a
EB		 1443 kuid_t uid;
1444 kgid_t gid;
26092bf5
TT		 1445 int arg = 0;
1446
57f73c2c
TT		 1447#ifdef CONFIG_QUOTA
1448 if (token == Opt_usrjquota)
1449 return set_qf_name(sb, USRQUOTA, &args[0]);
1450 else if (token == Opt_grpjquota)
1451 return set_qf_name(sb, GRPQUOTA, &args[0]);
1452 else if (token == Opt_offusrjquota)
1453 return clear_qf_name(sb, USRQUOTA);
1454 else if (token == Opt_offgrpjquota)
1455 return clear_qf_name(sb, GRPQUOTA);
1456#endif
26092bf5 1457 switch (token) {
f7048605
TT		 1458 case Opt_noacl:
1459 case Opt_nouser_xattr:
1460 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1461 break;
26092bf5
TT		 1462 case Opt_sb:
1463 return 1; /* handled by get_sb_block() */
1464 case Opt_removed:
5f3633e3 1465 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1466 return 1;
26092bf5
TT		 1467 case Opt_abort:
1468 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1469 return 1;
1470 case Opt_i_version:
1471 sb->s_flags |= MS_I_VERSION;
1472 return 1;
a26f4992
TT		 1473 case Opt_lazytime:
1474 sb->s_flags |= MS_LAZYTIME;
1475 return 1;
1476 case Opt_nolazytime:
1477 sb->s_flags &= ~MS_LAZYTIME;
1478 return 1;
26092bf5
TT		 1479 }
1480
5f3633e3
JK		 1481 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1482 if (token == m->token)
1483 break;
1484
1485 if (m->token == Opt_err) {
1486 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1487 "or missing value", opt);
1488 return -1;
1489 }
1490
8dc0aa8c
TT		 1491 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1492 ext4_msg(sb, KERN_ERR,
1493 "Mount option \"%s\" incompatible with ext2", opt);
1494 return -1;
1495 }
1496 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1497 ext4_msg(sb, KERN_ERR,
1498 "Mount option \"%s\" incompatible with ext3", opt);
1499 return -1;
1500 }
1501
ad4eec61 1502 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1503 return -1;
1504 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1505 return -1;
1506 if (m->flags & MOPT_EXPLICIT)
1507 set_opt2(sb, EXPLICIT_DELALLOC);
1508 if (m->flags & MOPT_CLEAR_ERR)
1509 clear_opt(sb, ERRORS_MASK);
1510 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1511 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1512 "options when quota turned on");
1513 return -1;
1514 }
1515
1516 if (m->flags & MOPT_NOSUPPORT) {
1517 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1518 } else if (token == Opt_commit) {
1519 if (arg == 0)
1520 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1521 sbi->s_commit_interval = HZ * arg;
1522 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1523 sbi->s_max_batch_time = arg;
1524 } else if (token == Opt_min_batch_time) {
1525 sbi->s_min_batch_time = arg;
1526 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1527 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1528 ext4_msg(sb, KERN_ERR,
1529 "EXT4-fs: inode_readahead_blks must be "
1530 "0 or a power of 2 smaller than 2^31");
26092bf5 1531 return -1;
5f3633e3
JK		 1532 }
1533 sbi->s_inode_readahead_blks = arg;
1534 } else if (token == Opt_init_itable) {
1535 set_opt(sb, INIT_INODE_TABLE);
1536 if (!args->from)
1537 arg = EXT4_DEF_LI_WAIT_MULT;
1538 sbi->s_li_wait_mult = arg;
1539 } else if (token == Opt_max_dir_size_kb) {
1540 sbi->s_max_dir_size_kb = arg;
1541 } else if (token == Opt_stripe) {
1542 sbi->s_stripe = arg;
1543 } else if (token == Opt_resuid) {
1544 uid = make_kuid(current_user_ns(), arg);
1545 if (!uid_valid(uid)) {
1546 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1547 return -1;
1548 }
5f3633e3
JK		 1549 sbi->s_resuid = uid;
1550 } else if (token == Opt_resgid) {
1551 gid = make_kgid(current_user_ns(), arg);
1552 if (!gid_valid(gid)) {
1553 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1554 return -1;
1555 }
1556 sbi->s_resgid = gid;
1557 } else if (token == Opt_journal_dev) {
1558 if (is_remount) {
1559 ext4_msg(sb, KERN_ERR,
1560 "Cannot specify journal on remount");
1561 return -1;
1562 }
1563 *journal_devnum = arg;
ad4eec61
ES		 1564 } else if (token == Opt_journal_path) {
1565 char *journal_path;
1566 struct inode *journal_inode;
1567 struct path path;
1568 int error;
1569
1570 if (is_remount) {
1571 ext4_msg(sb, KERN_ERR,
1572 "Cannot specify journal on remount");
1573 return -1;
1574 }
1575 journal_path = match_strdup(&args[0]);
1576 if (!journal_path) {
1577 ext4_msg(sb, KERN_ERR, "error: could not dup "
1578 "journal device string");
1579 return -1;
1580 }
1581
1582 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1583 if (error) {
1584 ext4_msg(sb, KERN_ERR, "error: could not find "
1585 "journal device path: error %d", error);
1586 kfree(journal_path);
1587 return -1;
1588 }
1589
2b0143b5 1590 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1591 if (!S_ISBLK(journal_inode->i_mode)) {
1592 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1593 "is not a block device", journal_path);
1594 path_put(&path);
1595 kfree(journal_path);
1596 return -1;
1597 }
1598
1599 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1600 path_put(&path);
1601 kfree(journal_path);
5f3633e3
JK		 1602 } else if (token == Opt_journal_ioprio) {
1603 if (arg > 7) {
1604 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1605 " (must be 0-7)");
1606 return -1;
1607 }
1608 *journal_ioprio =
1609 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1610 } else if (token == Opt_test_dummy_encryption) {
1611#ifdef CONFIG_EXT4_FS_ENCRYPTION
1612 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1613 ext4_msg(sb, KERN_WARNING,
1614 "Test dummy encryption mode enabled");
1615#else
1616 ext4_msg(sb, KERN_WARNING,
1617 "Test dummy encryption mount option ignored");
1618#endif
5f3633e3
JK		 1619 } else if (m->flags & MOPT_DATAJ) {
1620 if (is_remount) {
1621 if (!sbi->s_journal)
1622 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1623 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1624 ext4_msg(sb, KERN_ERR,
26092bf5 1625 "Cannot change data mode on remount");
26092bf5 1626 return -1;
ac27a0ec 1627 }
26092bf5 1628 } else {
5f3633e3
JK		 1629 clear_opt(sb, DATA_FLAGS);
1630 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1631 }
5f3633e3
JK		 1632#ifdef CONFIG_QUOTA
1633 } else if (m->flags & MOPT_QFMT) {
1634 if (sb_any_quota_loaded(sb) &&
1635 sbi->s_jquota_fmt != m->mount_opt) {
1636 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1637 "quota options when quota turned on");
1638 return -1;
1639 }
262b4662
JK		 1640 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1641 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1642 ext4_msg(sb, KERN_ERR,
1643 "Cannot set journaled quota options "
1644 "when QUOTA feature is enabled");
1645 return -1;
1646 }
5f3633e3 1647 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff
RZ		 1648#endif
1649#ifndef CONFIG_FS_DAX
1650 } else if (token == Opt_dax) {
1651 ext4_msg(sb, KERN_INFO, "dax option not supported");
1652 return -1;
5f3633e3
JK		 1653#endif
1654 } else {
1655 if (!args->from)
1656 arg = 1;
1657 if (m->flags & MOPT_CLEAR)
1658 arg = !arg;
1659 else if (unlikely(!(m->flags & MOPT_SET))) {
1660 ext4_msg(sb, KERN_WARNING,
1661 "buggy handling of option %s", opt);
1662 WARN_ON(1);
1663 return -1;
1664 }
1665 if (arg != 0)
1666 sbi->s_mount_opt |= m->mount_opt;
1667 else
1668 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1669 }
5f3633e3 1670 return 1;
26092bf5
TT		 1671}
1672
1673static int parse_options(char *options, struct super_block *sb,
1674 unsigned long *journal_devnum,
1675 unsigned int *journal_ioprio,
1676 int is_remount)
1677{
1678 struct ext4_sb_info *sbi = EXT4_SB(sb);
1679 char *p;
1680 substring_t args[MAX_OPT_ARGS];
1681 int token;
1682
1683 if (!options)
1684 return 1;
1685
1686 while ((p = strsep(&options, ",")) != NULL) {
1687 if (!*p)
1688 continue;
1689 /*
1690 * Initialize args struct so we know whether arg was
1691 * found; some options take optional arguments.
1692 */
caecd0af 1693 args[0].to = args[0].from = NULL;
26092bf5
TT		 1694 token = match_token(p, tokens, args);
1695 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1696 journal_ioprio, is_remount) < 0)
1697 return 0;
ac27a0ec
DK		 1698 }
1699#ifdef CONFIG_QUOTA
262b4662
JK		 1700 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1701 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1702 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1703 "feature is enabled");
1704 return 0;
1705 }
ac27a0ec 1706 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1707 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1708 clear_opt(sb, USRQUOTA);
ac27a0ec 1709
482a7425 1710 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1711 clear_opt(sb, GRPQUOTA);
ac27a0ec 1712
56c50f11 1713 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1714 ext4_msg(sb, KERN_ERR, "old and new quota "
1715 "format mixing");
ac27a0ec
DK		 1716 return 0;
1717 }
1718
1719 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1720 ext4_msg(sb, KERN_ERR, "journaled quota format "
1721 "not specified");
ac27a0ec
DK		 1722 return 0;
1723 }
ac27a0ec
DK		 1724 }
1725#endif
261cb20c
JK		 1726 if (test_opt(sb, DIOREAD_NOLOCK)) {
1727 int blocksize =
1728 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1729
1730 if (blocksize < PAGE_CACHE_SIZE) {
1731 ext4_msg(sb, KERN_ERR, "can't mount with "
1732 "dioread_nolock if block size != PAGE_SIZE");
1733 return 0;
1734 }
1735 }
d4f76107
JK		 1736 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1737 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1738 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1739 "in data=ordered mode");
1740 return 0;
1741 }
ac27a0ec
DK		 1742 return 1;
1743}
1744
2adf6da8
TT		 1745static inline void ext4_show_quota_options(struct seq_file *seq,
1746 struct super_block *sb)
1747{
1748#if defined(CONFIG_QUOTA)
1749 struct ext4_sb_info *sbi = EXT4_SB(sb);
1750
1751 if (sbi->s_jquota_fmt) {
1752 char *fmtname = "";
1753
1754 switch (sbi->s_jquota_fmt) {
1755 case QFMT_VFS_OLD:
1756 fmtname = "vfsold";
1757 break;
1758 case QFMT_VFS_V0:
1759 fmtname = "vfsv0";
1760 break;
1761 case QFMT_VFS_V1:
1762 fmtname = "vfsv1";
1763 break;
1764 }
1765 seq_printf(seq, ",jqfmt=%s", fmtname);
1766 }
1767
1768 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1769 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1770
1771 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1772 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1773#endif
1774}
1775
5a916be1
TT		 1776static const char *token2str(int token)
1777{
50df9fd5 1778 const struct match_token *t;
5a916be1
TT		 1779
1780 for (t = tokens; t->token != Opt_err; t++)
1781 if (t->token == token && !strchr(t->pattern, '='))
1782 break;
1783 return t->pattern;
1784}
1785
2adf6da8
TT		 1786/*
1787 * Show an option if
1788 * - it's set to a non-default value OR
1789 * - if the per-sb default is different from the global default
1790 */
66acdcf4
TT		 1791static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1792 int nodefs)
2adf6da8 1793{
2adf6da8
TT		 1794 struct ext4_sb_info *sbi = EXT4_SB(sb);
1795 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1796 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1797 const struct mount_opts *m;
66acdcf4 1798 char sep = nodefs ? '\n' : ',';
2adf6da8 1799
66acdcf4
TT		 1800#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1801#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1802
1803 if (sbi->s_sb_block != 1)
5a916be1
TT		 1804 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1805
1806 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1807 int want_set = m->flags & MOPT_SET;
1808 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1809 (m->flags & MOPT_CLEAR_ERR))
1810 continue;
66acdcf4 1811 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1812 continue; /* skip if same as the default */
1813 if ((want_set &&
1814 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1815 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1816 continue; /* select Opt_noFoo vs Opt_Foo */
1817 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1818 }
5a916be1 1819
08cefc7a 1820 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1821 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1822 SEQ_OPTS_PRINT("resuid=%u",
1823 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1824 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1825 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1826 SEQ_OPTS_PRINT("resgid=%u",
1827 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1828 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1829 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1830 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1831 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1832 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1833 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1834 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1835 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1836 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1837 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1838 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1839 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1840 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1841 if (sb->s_flags & MS_I_VERSION)
5a916be1 1842 SEQ_OPTS_PUTS("i_version");
66acdcf4 1843 if (nodefs || sbi->s_stripe)
5a916be1 1844 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1845 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1846 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1847 SEQ_OPTS_PUTS("data=journal");
1848 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1849 SEQ_OPTS_PUTS("data=ordered");
1850 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1851 SEQ_OPTS_PUTS("data=writeback");
1852 }
66acdcf4
TT		 1853 if (nodefs ||
1854 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1855 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1856 sbi->s_inode_readahead_blks);
2adf6da8 1857
66acdcf4
TT		 1858 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1859 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1860 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1861 if (nodefs || sbi->s_max_dir_size_kb)
1862 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1863
1864 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1865 return 0;
1866}
1867
66acdcf4
TT		 1868static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1869{
1870 return _ext4_show_options(seq, root->d_sb, 0);
1871}
1872
ebd173be 1873int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 1874{
1875 struct super_block *sb = seq->private;
1876 int rc;
1877
1878 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1879 rc = _ext4_show_options(seq, sb, 1);
1880 seq_puts(seq, "\n");
1881 return rc;
1882}
1883
617ba13b 1884static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1885 int read_only)
1886{
617ba13b 1887 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1888 int res = 0;
1889
617ba13b 1890 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1891 ext4_msg(sb, KERN_ERR, "revision level too high, "
1892 "forcing read-only mode");
ac27a0ec
DK		 1893 res = MS_RDONLY;
1894 }
1895 if (read_only)
281b5995 1896 goto done;
617ba13b 1897 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1898 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1899 "running e2fsck is recommended");
c8b459f4 1900 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1901 ext4_msg(sb, KERN_WARNING,
1902 "warning: mounting fs with errors, "
1903 "running e2fsck is recommended");
ed3ce80a 1904 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1905 le16_to_cpu(es->s_mnt_count) >=
1906 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1907 ext4_msg(sb, KERN_WARNING,
1908 "warning: maximal mount count reached, "
1909 "running e2fsck is recommended");
ac27a0ec
DK		 1910 else if (le32_to_cpu(es->s_checkinterval) &&
1911 (le32_to_cpu(es->s_lastcheck) +
1912 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1913 ext4_msg(sb, KERN_WARNING,
1914 "warning: checktime reached, "
1915 "running e2fsck is recommended");
0b8e58a1 1916 if (!sbi->s_journal)
0390131b 1917 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1918 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1919 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1920 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1921 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1922 ext4_update_dynamic_rev(sb);
0390131b
FM		 1923 if (sbi->s_journal)
1924 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1925
e2d67052 1926 ext4_commit_super(sb, 1);
281b5995 1927done:
ac27a0ec 1928 if (test_opt(sb, DEBUG))
a9df9a49 1929 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1930 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1931 sb->s_blocksize,
1932 sbi->s_groups_count,
617ba13b
MC		 1933 EXT4_BLOCKS_PER_GROUP(sb),
1934 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1935 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1936
7abc52c2 1937 cleancache_init_fs(sb);
ac27a0ec
DK		 1938 return res;
1939}
1940
117fff10
TT		 1941int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1942{
1943 struct ext4_sb_info *sbi = EXT4_SB(sb);
1944 struct flex_groups *new_groups;
1945 int size;
1946
1947 if (!sbi->s_log_groups_per_flex)
1948 return 0;
1949
1950 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1951 if (size <= sbi->s_flex_groups_allocated)
1952 return 0;
1953
1954 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1955 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1956 if (!new_groups) {
1957 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1958 size / (int) sizeof(struct flex_groups));
1959 return -ENOMEM;
1960 }
1961
1962 if (sbi->s_flex_groups) {
1963 memcpy(new_groups, sbi->s_flex_groups,
1964 (sbi->s_flex_groups_allocated *
1965 sizeof(struct flex_groups)));
b93b41d4 1966 kvfree(sbi->s_flex_groups);
117fff10
TT		 1967 }
1968 sbi->s_flex_groups = new_groups;
1969 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1970 return 0;
1971}
1972
772cb7c8
JS		 1973static int ext4_fill_flex_info(struct super_block *sb)
1974{
1975 struct ext4_sb_info *sbi = EXT4_SB(sb);
1976 struct ext4_group_desc *gdp = NULL;
772cb7c8 1977 ext4_group_t flex_group;
117fff10 1978 int i, err;
772cb7c8 1979
503358ae 1980 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1981 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1982 sbi->s_log_groups_per_flex = 0;
1983 return 1;
1984 }
1985
117fff10
TT		 1986 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1987 if (err)
9933fc0a 1988 goto failed;
772cb7c8 1989
772cb7c8 1990 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1991 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1992
1993 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1994 atomic_add(ext4_free_inodes_count(sb, gdp),
1995 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1996 atomic64_add(ext4_free_group_clusters(sb, gdp),
1997 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1998 atomic_add(ext4_used_dirs_count(sb, gdp),
1999 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2000 }
2001
2002 return 1;
2003failed:
2004 return 0;
2005}
2006
feb0ab32
DW		 2007static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2008 struct ext4_group_desc *gdp)
717d50e4 2009{
feb0ab32 2010 int offset;
717d50e4 2011 __u16 crc = 0;
feb0ab32 2012 __le32 le_group = cpu_to_le32(block_group);
717d50e4 2013
9aa5d32b 2014 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2015 /* Use new metadata_csum algorithm */
d6a77105 2016 __le16 save_csum;
feb0ab32
DW		 2017 __u32 csum32;
2018
d6a77105 2019 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2020 gdp->bg_checksum = 0;
2021 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2022 sizeof(le_group));
2023 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2024 sbi->s_desc_size);
d6a77105 2025 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2026
2027 crc = csum32 & 0xFFFF;
2028 goto out;
717d50e4
AD		 2029 }
2030
feb0ab32 2031 /* old crc16 code */
813d32f9
DW		 2032 if (!(sbi->s_es->s_feature_ro_compat &
2033 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
2034 return 0;
2035
feb0ab32
DW		 2036 offset = offsetof(struct ext4_group_desc, bg_checksum);
2037
2038 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2039 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2040 crc = crc16(crc, (__u8 *)gdp, offset);
2041 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2042 /* for checksum of struct ext4_group_desc do the rest...*/
2043 if ((sbi->s_es->s_feature_incompat &
2044 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2045 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2046 crc = crc16(crc, (__u8 *)gdp + offset,
2047 le16_to_cpu(sbi->s_es->s_desc_size) -
2048 offset);
2049
2050out:
717d50e4
AD		 2051 return cpu_to_le16(crc);
2052}
2053
feb0ab32 2054int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2055 struct ext4_group_desc *gdp)
2056{
feb0ab32
DW		 2057 if (ext4_has_group_desc_csum(sb) &&
2058 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2059 block_group, gdp)))
717d50e4
AD		 2060 return 0;
2061
2062 return 1;
2063}
2064
feb0ab32
DW		 2065void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2066 struct ext4_group_desc *gdp)
2067{
2068 if (!ext4_has_group_desc_csum(sb))
2069 return;
2070 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2071}
2072
ac27a0ec 2073/* Called at mount-time, super-block is locked */
bfff6873
LC		 2074static int ext4_check_descriptors(struct super_block *sb,
2075 ext4_group_t *first_not_zeroed)
ac27a0ec 2076{
617ba13b
MC		 2077 struct ext4_sb_info *sbi = EXT4_SB(sb);
2078 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2079 ext4_fsblk_t last_block;
bd81d8ee
LV		 2080 ext4_fsblk_t block_bitmap;
2081 ext4_fsblk_t inode_bitmap;
2082 ext4_fsblk_t inode_table;
ce421581 2083 int flexbg_flag = 0;
bfff6873 2084 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2085
ce421581
JS		 2086 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2087 flexbg_flag = 1;
2088
af5bc92d 2089 ext4_debug("Checking group descriptors");
ac27a0ec 2090
197cd65a
AM		 2091 for (i = 0; i < sbi->s_groups_count; i++) {
2092 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2093
ce421581 2094 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2095 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2096 else
2097 last_block = first_block +
617ba13b 2098 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2099
bfff6873
LC		 2100 if ((grp == sbi->s_groups_count) &&
2101 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2102 grp = i;
2103
8fadc143 2104 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2105 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2106 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2107 "Block bitmap for group %u not in group "
b31e1552 2108 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2109 return 0;
2110 }
8fadc143 2111 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2112 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2113 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2114 "Inode bitmap for group %u not in group "
b31e1552 2115 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2116 return 0;
2117 }
8fadc143 2118 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2119 if (inode_table < first_block ||
2b2d6d01 2120 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2121 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2122 "Inode table for group %u not in group "
b31e1552 2123 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2124 return 0;
2125 }
955ce5f5 2126 ext4_lock_group(sb, i);
feb0ab32 2127 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2128 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2129 "Checksum for group %u failed (%u!=%u)",
2130 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2131 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2132 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2133 ext4_unlock_group(sb, i);
8a266467 2134 return 0;
7ee1ec4c 2135 }
717d50e4 2136 }
955ce5f5 2137 ext4_unlock_group(sb, i);
ce421581
JS		 2138 if (!flexbg_flag)
2139 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2140 }
bfff6873
LC		 2141 if (NULL != first_not_zeroed)
2142 *first_not_zeroed = grp;
ac27a0ec
DK		 2143 return 1;
2144}
2145
617ba13b 2146/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2147 * the superblock) which were deleted from all directories, but held open by
2148 * a process at the time of a crash. We walk the list and try to delete these
2149 * inodes at recovery time (only with a read-write filesystem).
2150 *
2151 * In order to keep the orphan inode chain consistent during traversal (in
2152 * case of crash during recovery), we link each inode into the superblock
2153 * orphan list_head and handle it the same way as an inode deletion during
2154 * normal operation (which journals the operations for us).
2155 *
2156 * We only do an iget() and an iput() on each inode, which is very safe if we
2157 * accidentally point at an in-use or already deleted inode. The worst that
2158 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2159 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2160 * e2fsck was run on this filesystem, and it must have already done the orphan
2161 * inode cleanup for us, so we can safely abort without any further action.
2162 */
2b2d6d01
TT		 2163static void ext4_orphan_cleanup(struct super_block *sb,
2164 struct ext4_super_block *es)
ac27a0ec
DK		 2165{
2166 unsigned int s_flags = sb->s_flags;
2167 int nr_orphans = 0, nr_truncates = 0;
2168#ifdef CONFIG_QUOTA
2169 int i;
2170#endif
2171 if (!es->s_last_orphan) {
2172 jbd_debug(4, "no orphan inodes to clean up\n");
2173 return;
2174 }
2175
a8f48a95 2176 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2177 ext4_msg(sb, KERN_ERR, "write access "
2178 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2179 return;
2180 }
2181
d39195c3
AG		 2182 /* Check if feature set would not allow a r/w mount */
2183 if (!ext4_feature_set_ok(sb, 0)) {
2184 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2185 "unknown ROCOMPAT features");
2186 return;
2187 }
2188
617ba13b 2189 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2190 /* don't clear list on RO mount w/ errors */
2191 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2192 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2193 "clearing orphan list.\n");
c25f9bc6
ES		 2194 es->s_last_orphan = 0;
2195 }
ac27a0ec
DK		 2196 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2197 return;
2198 }
2199
2200 if (s_flags & MS_RDONLY) {
b31e1552 2201 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2202 sb->s_flags &= ~MS_RDONLY;
2203 }
2204#ifdef CONFIG_QUOTA
2205 /* Needed for iput() to work correctly and not trash data */
2206 sb->s_flags |= MS_ACTIVE;
2207 /* Turn on quotas so that they are updated correctly */
a2d4a646 2208 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2209 if (EXT4_SB(sb)->s_qf_names[i]) {
2210 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2211 if (ret < 0)
b31e1552
ES		 2212 ext4_msg(sb, KERN_ERR,
2213 "Cannot turn on journaled "
2214 "quota: error %d", ret);
ac27a0ec
DK		 2215 }
2216 }
2217#endif
2218
2219 while (es->s_last_orphan) {
2220 struct inode *inode;
2221
97bd42b9
JB		 2222 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2223 if (IS_ERR(inode)) {
ac27a0ec
DK		 2224 es->s_last_orphan = 0;
2225 break;
2226 }
2227
617ba13b 2228 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2229 dquot_initialize(inode);
ac27a0ec 2230 if (inode->i_nlink) {
566370a2
PT		 2231 if (test_opt(sb, DEBUG))
2232 ext4_msg(sb, KERN_DEBUG,
2233 "%s: truncating inode %lu to %lld bytes",
2234 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2235 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2236 inode->i_ino, inode->i_size);
721e3eba 2237 mutex_lock(&inode->i_mutex);
55f252c9 2238 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2239 ext4_truncate(inode);
721e3eba 2240 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2241 nr_truncates++;
2242 } else {
566370a2
PT		 2243 if (test_opt(sb, DEBUG))
2244 ext4_msg(sb, KERN_DEBUG,
2245 "%s: deleting unreferenced inode %lu",
2246 __func__, inode->i_ino);
ac27a0ec
DK		 2247 jbd_debug(2, "deleting unreferenced inode %lu\n",
2248 inode->i_ino);
2249 nr_orphans++;
2250 }
2251 iput(inode); /* The delete magic happens here! */
2252 }
2253
2b2d6d01 2254#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2255
2256 if (nr_orphans)
b31e1552
ES		 2257 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2258 PLURAL(nr_orphans));
ac27a0ec 2259 if (nr_truncates)
b31e1552
ES		 2260 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2261 PLURAL(nr_truncates));
ac27a0ec
DK		 2262#ifdef CONFIG_QUOTA
2263 /* Turn quotas off */
a2d4a646 2264 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2265 if (sb_dqopt(sb)->files[i])
287a8095 2266 dquot_quota_off(sb, i);
ac27a0ec
DK		 2267 }
2268#endif
2269 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2270}
0b8e58a1 2271
cd2291a4
ES		 2272/*
2273 * Maximal extent format file size.
2274 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2275 * extent format containers, within a sector_t, and within i_blocks
2276 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2277 * so that won't be a limiting factor.
2278 *
f17722f9
LC		 2279 * However there is other limiting factor. We do store extents in the form
2280 * of starting block and length, hence the resulting length of the extent
2281 * covering maximum file size must fit into on-disk format containers as
2282 * well. Given that length is always by 1 unit bigger than max unit (because
2283 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2284 *
cd2291a4
ES		 2285 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2286 */
f287a1a5 2287static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2288{
2289 loff_t res;
2290 loff_t upper_limit = MAX_LFS_FILESIZE;
2291
2292 /* small i_blocks in vfs inode? */
f287a1a5 2293 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2294 /*
90c699a9 2295 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2296 * i_block represent total blocks in 512 bytes
2297 * 32 == size of vfs inode i_blocks * 8
2298 */
2299 upper_limit = (1LL << 32) - 1;
2300
2301 /* total blocks in file system block size */
2302 upper_limit >>= (blkbits - 9);
2303 upper_limit <<= blkbits;
2304 }
2305
f17722f9
LC		 2306 /*
2307 * 32-bit extent-start container, ee_block. We lower the maxbytes
2308 * by one fs block, so ee_len can cover the extent of maximum file
2309 * size
2310 */
2311 res = (1LL << 32) - 1;
cd2291a4 2312 res <<= blkbits;
cd2291a4
ES		 2313
2314 /* Sanity check against vm- & vfs- imposed limits */
2315 if (res > upper_limit)
2316 res = upper_limit;
2317
2318 return res;
2319}
ac27a0ec 2320
ac27a0ec 2321/*
cd2291a4 2322 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2323 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2324 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2325 */
f287a1a5 2326static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2327{
617ba13b 2328 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2329 int meta_blocks;
2330 loff_t upper_limit;
0b8e58a1
AD		 2331 /* This is calculated to be the largest file size for a dense, block
2332 * mapped file such that the file's total number of 512-byte sectors,
2333 * including data and all indirect blocks, does not exceed (2^48 - 1).
2334 *
2335 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2336 * number of 512-byte sectors of the file.
0fc1b451
AK		 2337 */
2338
f287a1a5 2339 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2340 /*
90c699a9 2341 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2342 * the inode i_block field represents total file blocks in
2343 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2344 */
2345 upper_limit = (1LL << 32) - 1;
2346
2347 /* total blocks in file system block size */
2348 upper_limit >>= (bits - 9);
2349
2350 } else {
8180a562
AK		 2351 /*
2352 * We use 48 bit ext4_inode i_blocks
2353 * With EXT4_HUGE_FILE_FL set the i_blocks
2354 * represent total number of blocks in
2355 * file system block size
2356 */
0fc1b451
AK		 2357 upper_limit = (1LL << 48) - 1;
2358
0fc1b451
AK		 2359 }
2360
2361 /* indirect blocks */
2362 meta_blocks = 1;
2363 /* double indirect blocks */
2364 meta_blocks += 1 + (1LL << (bits-2));
2365 /* tripple indirect blocks */
2366 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2367
2368 upper_limit -= meta_blocks;
2369 upper_limit <<= bits;
ac27a0ec
DK		 2370
2371 res += 1LL << (bits-2);
2372 res += 1LL << (2*(bits-2));
2373 res += 1LL << (3*(bits-2));
2374 res <<= bits;
2375 if (res > upper_limit)
2376 res = upper_limit;
0fc1b451
AK		 2377
2378 if (res > MAX_LFS_FILESIZE)
2379 res = MAX_LFS_FILESIZE;
2380
ac27a0ec
DK		 2381 return res;
2382}
2383
617ba13b 2384static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2385 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2386{
617ba13b 2387 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2388 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2389 int has_super = 0;
2390
2391 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2392
617ba13b 2393 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2394 nr < first_meta_bg)
70bbb3e0 2395 return logical_sb_block + nr + 1;
ac27a0ec 2396 bg = sbi->s_desc_per_block * nr;
617ba13b 2397 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2398 has_super = 1;
0b8e58a1 2399
bd63f6b0
DW		 2400 /*
2401 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2402 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2403 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2404 * compensate.
2405 */
2406 if (sb->s_blocksize == 1024 && nr == 0 &&
2407 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2408 has_super++;
2409
617ba13b 2410 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2411}
2412
c9de560d
AT		 2413/**
2414 * ext4_get_stripe_size: Get the stripe size.
2415 * @sbi: In memory super block info
2416 *
2417 * If we have specified it via mount option, then
2418 * use the mount option value. If the value specified at mount time is
2419 * greater than the blocks per group use the super block value.
2420 * If the super block value is greater than blocks per group return 0.
2421 * Allocator needs it be less than blocks per group.
2422 *
2423 */
2424static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2425{
2426 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2427 unsigned long stripe_width =
2428 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2429 int ret;
c9de560d
AT		 2430
2431 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2432 ret = sbi->s_stripe;
2433 else if (stripe_width <= sbi->s_blocks_per_group)
2434 ret = stripe_width;
2435 else if (stride <= sbi->s_blocks_per_group)
2436 ret = stride;
2437 else
2438 ret = 0;
c9de560d 2439
3eb08658
DE		 2440 /*
2441 * If the stripe width is 1, this makes no sense and
2442 * we set it to 0 to turn off stripe handling code.
2443 */
2444 if (ret <= 1)
2445 ret = 0;
c9de560d 2446
3eb08658 2447 return ret;
c9de560d 2448}
ac27a0ec 2449
a13fb1a4
ES		 2450/*
2451 * Check whether this filesystem can be mounted based on
2452 * the features present and the RDONLY/RDWR mount requested.
2453 * Returns 1 if this filesystem can be mounted as requested,
2454 * 0 if it cannot be.
2455 */
2456static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2457{
2458 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2459 ext4_msg(sb, KERN_ERR,
2460 "Couldn't mount because of "
2461 "unsupported optional features (%x)",
2462 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2463 ~EXT4_FEATURE_INCOMPAT_SUPP));
2464 return 0;
2465 }
2466
2467 if (readonly)
2468 return 1;
2469
2cb5cc8b
DW		 2470 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_READONLY)) {
2471 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2472 sb->s_flags |= MS_RDONLY;
2473 return 1;
2474 }
2475
a13fb1a4
ES		 2476 /* Check that feature set is OK for a read-write mount */
2477 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2478 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2479 "unsupported optional features (%x)",
2480 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2481 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2482 return 0;
2483 }
2484 /*
2485 * Large file size enabled file system can only be mounted
2486 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2487 */
2488 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2489 if (sizeof(blkcnt_t) < sizeof(u64)) {
2490 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2491 "cannot be mounted RDWR without "
2492 "CONFIG_LBDAF");
2493 return 0;
2494 }
2495 }
bab08ab9
TT		 2496 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2497 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2498 ext4_msg(sb, KERN_ERR,
2499 "Can't support bigalloc feature without "
2500 "extents feature\n");
2501 return 0;
2502 }
7c319d32
AK		 2503
2504#ifndef CONFIG_QUOTA
2505 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2506 !readonly) {
2507 ext4_msg(sb, KERN_ERR,
2508 "Filesystem with quota feature cannot be mounted RDWR "
2509 "without CONFIG_QUOTA");
2510 return 0;
2511 }
2512#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2513 return 1;
2514}
2515
66e61a9e
TT		 2516/*
2517 * This function is called once a day if we have errors logged
2518 * on the file system
2519 */
2520static void print_daily_error_info(unsigned long arg)
2521{
2522 struct super_block *sb = (struct super_block *) arg;
2523 struct ext4_sb_info *sbi;
2524 struct ext4_super_block *es;
2525
2526 sbi = EXT4_SB(sb);
2527 es = sbi->s_es;
2528
2529 if (es->s_error_count)
ae0f78de
TT		 2530 /* fsck newer than v1.41.13 is needed to clean this condition. */
2531 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2532 le32_to_cpu(es->s_error_count));
2533 if (es->s_first_error_time) {
ae0f78de 2534 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2535 sb->s_id, le32_to_cpu(es->s_first_error_time),
2536 (int) sizeof(es->s_first_error_func),
2537 es->s_first_error_func,
2538 le32_to_cpu(es->s_first_error_line));
2539 if (es->s_first_error_ino)
2540 printk(": inode %u",
2541 le32_to_cpu(es->s_first_error_ino));
2542 if (es->s_first_error_block)
2543 printk(": block %llu", (unsigned long long)
2544 le64_to_cpu(es->s_first_error_block));
2545 printk("\n");
2546 }
2547 if (es->s_last_error_time) {
ae0f78de 2548 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2549 sb->s_id, le32_to_cpu(es->s_last_error_time),
2550 (int) sizeof(es->s_last_error_func),
2551 es->s_last_error_func,
2552 le32_to_cpu(es->s_last_error_line));
2553 if (es->s_last_error_ino)
2554 printk(": inode %u",
2555 le32_to_cpu(es->s_last_error_ino));
2556 if (es->s_last_error_block)
2557 printk(": block %llu", (unsigned long long)
2558 le64_to_cpu(es->s_last_error_block));
2559 printk("\n");
2560 }
2561 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2562}
2563
bfff6873
LC		 2564/* Find next suitable group and run ext4_init_inode_table */
2565static int ext4_run_li_request(struct ext4_li_request *elr)
2566{
2567 struct ext4_group_desc *gdp = NULL;
2568 ext4_group_t group, ngroups;
2569 struct super_block *sb;
2570 unsigned long timeout = 0;
2571 int ret = 0;
2572
2573 sb = elr->lr_super;
2574 ngroups = EXT4_SB(sb)->s_groups_count;
2575
8e8ad8a5 2576 sb_start_write(sb);
bfff6873
LC		 2577 for (group = elr->lr_next_group; group < ngroups; group++) {
2578 gdp = ext4_get_group_desc(sb, group, NULL);
2579 if (!gdp) {
2580 ret = 1;
2581 break;
2582 }
2583
2584 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2585 break;
2586 }
2587
7f511862 2588 if (group >= ngroups)
bfff6873
LC		 2589 ret = 1;
2590
2591 if (!ret) {
2592 timeout = jiffies;
2593 ret = ext4_init_inode_table(sb, group,
2594 elr->lr_timeout ? 0 : 1);
2595 if (elr->lr_timeout == 0) {
51ce6511
LC		 2596 timeout = (jiffies - timeout) *
2597 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2598 elr->lr_timeout = timeout;
2599 }
2600 elr->lr_next_sched = jiffies + elr->lr_timeout;
2601 elr->lr_next_group = group + 1;
2602 }
8e8ad8a5 2603 sb_end_write(sb);
bfff6873
LC		 2604
2605 return ret;
2606}
2607
2608/*
2609 * Remove lr_request from the list_request and free the
4ed5c033 2610 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2611 */
2612static void ext4_remove_li_request(struct ext4_li_request *elr)
2613{
2614 struct ext4_sb_info *sbi;
2615
2616 if (!elr)
2617 return;
2618
2619 sbi = elr->lr_sbi;
2620
2621 list_del(&elr->lr_request);
2622 sbi->s_li_request = NULL;
2623 kfree(elr);
2624}
2625
2626static void ext4_unregister_li_request(struct super_block *sb)
2627{
1bb933fb
LC		 2628 mutex_lock(&ext4_li_mtx);
2629 if (!ext4_li_info) {
2630 mutex_unlock(&ext4_li_mtx);
bfff6873 2631 return;
1bb933fb 2632 }
bfff6873
LC		 2633
2634 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2635 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2636 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2637 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2638}
2639
8f1f7453
ES		 2640static struct task_struct *ext4_lazyinit_task;
2641
bfff6873
LC		 2642/*
2643 * This is the function where ext4lazyinit thread lives. It walks
2644 * through the request list searching for next scheduled filesystem.
2645 * When such a fs is found, run the lazy initialization request
2646 * (ext4_rn_li_request) and keep track of the time spend in this
2647 * function. Based on that time we compute next schedule time of
2648 * the request. When walking through the list is complete, compute
2649 * next waking time and put itself into sleep.
2650 */
2651static int ext4_lazyinit_thread(void *arg)
2652{
2653 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2654 struct list_head *pos, *n;
2655 struct ext4_li_request *elr;
4ed5c033 2656 unsigned long next_wakeup, cur;
bfff6873
LC		 2657
2658 BUG_ON(NULL == eli);
2659
bfff6873
LC		 2660cont_thread:
2661 while (true) {
2662 next_wakeup = MAX_JIFFY_OFFSET;
2663
2664 mutex_lock(&eli->li_list_mtx);
2665 if (list_empty(&eli->li_request_list)) {
2666 mutex_unlock(&eli->li_list_mtx);
2667 goto exit_thread;
2668 }
2669
2670 list_for_each_safe(pos, n, &eli->li_request_list) {
2671 elr = list_entry(pos, struct ext4_li_request,
2672 lr_request);
2673
b2c78cd0
TT		 2674 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2675 if (ext4_run_li_request(elr) != 0) {
2676 /* error, remove the lazy_init job */
2677 ext4_remove_li_request(elr);
2678 continue;
2679 }
bfff6873
LC		 2680 }
2681
2682 if (time_before(elr->lr_next_sched, next_wakeup))
2683 next_wakeup = elr->lr_next_sched;
2684 }
2685 mutex_unlock(&eli->li_list_mtx);
2686
a0acae0e 2687 try_to_freeze();
bfff6873 2688
4ed5c033
LC		 2689 cur = jiffies;
2690 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2691 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2692 cond_resched();
2693 continue;
2694 }
2695
4ed5c033
LC		 2696 schedule_timeout_interruptible(next_wakeup - cur);
2697
8f1f7453
ES		 2698 if (kthread_should_stop()) {
2699 ext4_clear_request_list();
2700 goto exit_thread;
2701 }
bfff6873
LC		 2702 }
2703
2704exit_thread:
2705 /*
2706 * It looks like the request list is empty, but we need
2707 * to check it under the li_list_mtx lock, to prevent any
2708 * additions into it, and of course we should lock ext4_li_mtx
2709 * to atomically free the list and ext4_li_info, because at
2710 * this point another ext4 filesystem could be registering
2711 * new one.
2712 */
2713 mutex_lock(&ext4_li_mtx);
2714 mutex_lock(&eli->li_list_mtx);
2715 if (!list_empty(&eli->li_request_list)) {
2716 mutex_unlock(&eli->li_list_mtx);
2717 mutex_unlock(&ext4_li_mtx);
2718 goto cont_thread;
2719 }
2720 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2721 kfree(ext4_li_info);
2722 ext4_li_info = NULL;
2723 mutex_unlock(&ext4_li_mtx);
2724
2725 return 0;
2726}
2727
2728static void ext4_clear_request_list(void)
2729{
2730 struct list_head *pos, *n;
2731 struct ext4_li_request *elr;
2732
2733 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2734 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2735 elr = list_entry(pos, struct ext4_li_request,
2736 lr_request);
2737 ext4_remove_li_request(elr);
2738 }
2739 mutex_unlock(&ext4_li_info->li_list_mtx);
2740}
2741
2742static int ext4_run_lazyinit_thread(void)
2743{
8f1f7453
ES		 2744 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2745 ext4_li_info, "ext4lazyinit");
2746 if (IS_ERR(ext4_lazyinit_task)) {
2747 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2748 ext4_clear_request_list();
bfff6873
LC		 2749 kfree(ext4_li_info);
2750 ext4_li_info = NULL;
92b97816 2751 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2752 "initialization thread\n",
2753 err);
2754 return err;
2755 }
2756 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2757 return 0;
2758}
2759
2760/*
2761 * Check whether it make sense to run itable init. thread or not.
2762 * If there is at least one uninitialized inode table, return
2763 * corresponding group number, else the loop goes through all
2764 * groups and return total number of groups.
2765 */
2766static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2767{
2768 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2769 struct ext4_group_desc *gdp = NULL;
2770
2771 for (group = 0; group < ngroups; group++) {
2772 gdp = ext4_get_group_desc(sb, group, NULL);
2773 if (!gdp)
2774 continue;
2775
2776 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2777 break;
2778 }
2779
2780 return group;
2781}
2782
2783static int ext4_li_info_new(void)
2784{
2785 struct ext4_lazy_init *eli = NULL;
2786
2787 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2788 if (!eli)
2789 return -ENOMEM;
2790
bfff6873
LC		 2791 INIT_LIST_HEAD(&eli->li_request_list);
2792 mutex_init(&eli->li_list_mtx);
2793
bfff6873
LC		 2794 eli->li_state |= EXT4_LAZYINIT_QUIT;
2795
2796 ext4_li_info = eli;
2797
2798 return 0;
2799}
2800
2801static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2802 ext4_group_t start)
2803{
2804 struct ext4_sb_info *sbi = EXT4_SB(sb);
2805 struct ext4_li_request *elr;
bfff6873
LC		 2806
2807 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2808 if (!elr)
2809 return NULL;
2810
2811 elr->lr_super = sb;
2812 elr->lr_sbi = sbi;
2813 elr->lr_next_group = start;
2814
2815 /*
2816 * Randomize first schedule time of the request to
2817 * spread the inode table initialization requests
2818 * better.
2819 */
dd1f723b
TT		 2820 elr->lr_next_sched = jiffies + (prandom_u32() %
2821 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 2822 return elr;
2823}
2824
7f511862
TT		 2825int ext4_register_li_request(struct super_block *sb,
2826 ext4_group_t first_not_zeroed)
bfff6873
LC		 2827{
2828 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2829 struct ext4_li_request *elr = NULL;
bfff6873 2830 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2831 int ret = 0;
bfff6873 2832
7f511862 2833 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2834 if (sbi->s_li_request != NULL) {
2835 /*
2836 * Reset timeout so it can be computed again, because
2837 * s_li_wait_mult might have changed.
2838 */
2839 sbi->s_li_request->lr_timeout = 0;
7f511862 2840 goto out;
51ce6511 2841 }
bfff6873
LC		 2842
2843 if (first_not_zeroed == ngroups ||
2844 (sb->s_flags & MS_RDONLY) ||
55ff3840 2845 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2846 goto out;
bfff6873
LC		 2847
2848 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2849 if (!elr) {
2850 ret = -ENOMEM;
2851 goto out;
2852 }
bfff6873
LC		 2853
2854 if (NULL == ext4_li_info) {
2855 ret = ext4_li_info_new();
2856 if (ret)
2857 goto out;
2858 }
2859
2860 mutex_lock(&ext4_li_info->li_list_mtx);
2861 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2862 mutex_unlock(&ext4_li_info->li_list_mtx);
2863
2864 sbi->s_li_request = elr;
46e4690b
TM		 2865 /*
2866 * set elr to NULL here since it has been inserted to
2867 * the request_list and the removal and free of it is
2868 * handled by ext4_clear_request_list from now on.
2869 */
2870 elr = NULL;
bfff6873
LC		 2871
2872 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2873 ret = ext4_run_lazyinit_thread();
2874 if (ret)
2875 goto out;
2876 }
bfff6873 2877out:
beed5ecb
NK		 2878 mutex_unlock(&ext4_li_mtx);
2879 if (ret)
bfff6873 2880 kfree(elr);
bfff6873
LC		 2881 return ret;
2882}
2883
2884/*
2885 * We do not need to lock anything since this is called on
2886 * module unload.
2887 */
2888static void ext4_destroy_lazyinit_thread(void)
2889{
2890 /*
2891 * If thread exited earlier
2892 * there's nothing to be done.
2893 */
8f1f7453 2894 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2895 return;
2896
8f1f7453 2897 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2898}
2899
25ed6e8a
DW		 2900static int set_journal_csum_feature_set(struct super_block *sb)
2901{
2902 int ret = 1;
2903 int compat, incompat;
2904 struct ext4_sb_info *sbi = EXT4_SB(sb);
2905
9aa5d32b 2906 if (ext4_has_metadata_csum(sb)) {
db9ee220 2907 /* journal checksum v3 */
25ed6e8a 2908 compat = 0;
db9ee220 2909 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 2910 } else {
2911 /* journal checksum v1 */
2912 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
2913 incompat = 0;
2914 }
2915
feb8c6d3
DW		 2916 jbd2_journal_clear_features(sbi->s_journal,
2917 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2918 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
2919 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 2920 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2921 ret = jbd2_journal_set_features(sbi->s_journal,
2922 compat, 0,
2923 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
2924 incompat);
2925 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2926 ret = jbd2_journal_set_features(sbi->s_journal,
2927 compat, 0,
2928 incompat);
2929 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2930 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2931 } else {
feb8c6d3
DW		 2932 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2933 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 2934 }
2935
2936 return ret;
2937}
2938
952fc18e
TT		 2939/*
2940 * Note: calculating the overhead so we can be compatible with
2941 * historical BSD practice is quite difficult in the face of
2942 * clusters/bigalloc. This is because multiple metadata blocks from
2943 * different block group can end up in the same allocation cluster.
2944 * Calculating the exact overhead in the face of clustered allocation
2945 * requires either O(all block bitmaps) in memory or O(number of block
2946 * groups**2) in time. We will still calculate the superblock for
2947 * older file systems --- and if we come across with a bigalloc file
2948 * system with zero in s_overhead_clusters the estimate will be close to
2949 * correct especially for very large cluster sizes --- but for newer
2950 * file systems, it's better to calculate this figure once at mkfs
2951 * time, and store it in the superblock. If the superblock value is
2952 * present (even for non-bigalloc file systems), we will use it.
2953 */
2954static int count_overhead(struct super_block *sb, ext4_group_t grp,
2955 char *buf)
2956{
2957 struct ext4_sb_info *sbi = EXT4_SB(sb);
2958 struct ext4_group_desc *gdp;
2959 ext4_fsblk_t first_block, last_block, b;
2960 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
2961 int s, j, count = 0;
2962
0548bbb8
TT		 2963 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
2964 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
2965 sbi->s_itb_per_group + 2);
2966
952fc18e
TT		 2967 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
2968 (grp * EXT4_BLOCKS_PER_GROUP(sb));
2969 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
2970 for (i = 0; i < ngroups; i++) {
2971 gdp = ext4_get_group_desc(sb, i, NULL);
2972 b = ext4_block_bitmap(sb, gdp);
2973 if (b >= first_block && b <= last_block) {
2974 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
2975 count++;
2976 }
2977 b = ext4_inode_bitmap(sb, gdp);
2978 if (b >= first_block && b <= last_block) {
2979 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
2980 count++;
2981 }
2982 b = ext4_inode_table(sb, gdp);
2983 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
2984 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
2985 int c = EXT4_B2C(sbi, b - first_block);
2986 ext4_set_bit(c, buf);
2987 count++;
2988 }
2989 if (i != grp)
2990 continue;
2991 s = 0;
2992 if (ext4_bg_has_super(sb, grp)) {
2993 ext4_set_bit(s++, buf);
2994 count++;
2995 }
2996 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
2997 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
2998 count++;
2999 }
3000 }
3001 if (!count)
3002 return 0;
3003 return EXT4_CLUSTERS_PER_GROUP(sb) -
3004 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3005}
3006
3007/*
3008 * Compute the overhead and stash it in sbi->s_overhead
3009 */
3010int ext4_calculate_overhead(struct super_block *sb)
3011{
3012 struct ext4_sb_info *sbi = EXT4_SB(sb);
3013 struct ext4_super_block *es = sbi->s_es;
3014 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3015 ext4_fsblk_t overhead = 0;
4fdb5543 3016 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3017
952fc18e
TT		 3018 if (!buf)
3019 return -ENOMEM;
3020
3021 /*
3022 * Compute the overhead (FS structures). This is constant
3023 * for a given filesystem unless the number of block groups
3024 * changes so we cache the previous value until it does.
3025 */
3026
3027 /*
3028 * All of the blocks before first_data_block are overhead
3029 */
3030 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3031
3032 /*
3033 * Add the overhead found in each block group
3034 */
3035 for (i = 0; i < ngroups; i++) {
3036 int blks;
3037
3038 blks = count_overhead(sb, i, buf);
3039 overhead += blks;
3040 if (blks)
3041 memset(buf, 0, PAGE_SIZE);
3042 cond_resched();
3043 }
b003b524
ES		 3044 /* Add the internal journal blocks as well */
3045 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3046 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3047
952fc18e
TT		 3048 sbi->s_overhead = overhead;
3049 smp_wmb();
3050 free_page((unsigned long) buf);
3051 return 0;
3052}
3053
b5799018 3054static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3055{
3056 ext4_fsblk_t resv_clusters;
b5799018 3057 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3058
30fac0f7
JK		 3059 /*
3060 * There's no need to reserve anything when we aren't using extents.
3061 * The space estimates are exact, there are no unwritten extents,
3062 * hole punching doesn't need new metadata... This is needed especially
3063 * to keep ext2/3 backward compatibility.
3064 */
3065 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
b5799018 3066 return;
27dd4385
LC		 3067 /*
3068 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3069 * This should cover the situations where we can not afford to run
3070 * out of space like for example punch hole, or converting
556615dc 3071 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3072 * allocation would require 1, or 2 blocks, higher numbers are
3073 * very rare.
3074 */
b5799018
TT		 3075 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3076 sbi->s_cluster_bits);
27dd4385
LC		 3077
3078 do_div(resv_clusters, 50);
3079 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3080
b5799018 3081 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3082}
3083
2b2d6d01 3084static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3085{
d4c402d9 3086 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3087 struct buffer_head *bh;
617ba13b
MC		 3088 struct ext4_super_block *es = NULL;
3089 struct ext4_sb_info *sbi;
3090 ext4_fsblk_t block;
3091 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3092 ext4_fsblk_t logical_sb_block;
ac27a0ec 3093 unsigned long offset = 0;
ac27a0ec
DK		 3094 unsigned long journal_devnum = 0;
3095 unsigned long def_mount_opts;
3096 struct inode *root;
0390131b 3097 const char *descr;
dcc7dae3 3098 int ret = -ENOMEM;
281b5995 3099 int blocksize, clustersize;
4ec11028
TT		 3100 unsigned int db_count;
3101 unsigned int i;
281b5995 3102 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3103 __u64 blocks_count;
07aa2ea1 3104 int err = 0;
b3881f74 3105 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3106 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3107
3108 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3109 if (!sbi)
dcc7dae3 3110 goto out_free_orig;
705895b6
PE		 3111
3112 sbi->s_blockgroup_lock =
3113 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3114 if (!sbi->s_blockgroup_lock) {
3115 kfree(sbi);
dcc7dae3 3116 goto out_free_orig;
705895b6 3117 }
ac27a0ec 3118 sb->s_fs_info = sbi;
2c0544b2 3119 sbi->s_sb = sb;
240799cd 3120 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3121 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3122 if (sb->s_bdev->bd_part)
3123 sbi->s_sectors_written_start =
3124 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3125
9f6200bb 3126 /* Cleanup superblock name */
ec3904dc 3127 strreplace(sb->s_id, '/', '!');
9f6200bb 3128
07aa2ea1 3129 /* -EINVAL is default */
dcc7dae3 3130 ret = -EINVAL;
617ba13b 3131 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3132 if (!blocksize) {
b31e1552 3133 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3134 goto out_fail;
3135 }
3136
3137 /*
617ba13b 3138 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3139 * block sizes. We need to calculate the offset from buffer start.
3140 */
617ba13b 3141 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3142 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3143 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3144 } else {
70bbb3e0 3145 logical_sb_block = sb_block;
ac27a0ec
DK		 3146 }
3147
a8ac900b 3148 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3149 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3150 goto out_fail;
3151 }
3152 /*
3153 * Note: s_es must be initialized as soon as possible because
617ba13b 3154 * some ext4 macro-instructions depend on its value
ac27a0ec 3155 */
2716b802 3156 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3157 sbi->s_es = es;
3158 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3159 if (sb->s_magic != EXT4_SUPER_MAGIC)
3160 goto cantfind_ext4;
afc32f7e 3161 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3162
feb0ab32
DW		 3163 /* Warn if metadata_csum and gdt_csum are both set. */
3164 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3165 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3166 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
363307e6 3167 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3168 "redundant flags; please run fsck.");
3169
d25425f8
DW		 3170 /* Check for a known checksum algorithm */
3171 if (!ext4_verify_csum_type(sb, es)) {
3172 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3173 "unknown checksum algorithm.");
3174 silent = 1;
3175 goto cantfind_ext4;
3176 }
3177
0441984a
DW		 3178 /* Load the checksum driver */
3179 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3180 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3181 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3182 if (IS_ERR(sbi->s_chksum_driver)) {
3183 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3184 ret = PTR_ERR(sbi->s_chksum_driver);
3185 sbi->s_chksum_driver = NULL;
3186 goto failed_mount;
3187 }
3188 }
3189
a9c47317
DW		 3190 /* Check superblock checksum */
3191 if (!ext4_superblock_csum_verify(sb, es)) {
3192 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3193 "invalid superblock checksum. Run e2fsck?");
3194 silent = 1;
3195 goto cantfind_ext4;
3196 }
3197
3198 /* Precompute checksum seed for all metadata */
8c81bd8f
DW		 3199 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_CSUM_SEED))
3200 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3201 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3202 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3203 sizeof(es->s_uuid));
3204
ac27a0ec
DK		 3205 /* Set defaults before we parse the mount options */
3206 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3207 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3208 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3209 set_opt(sb, DEBUG);
87f26807 3210 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3211 set_opt(sb, GRPID);
617ba13b 3212 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3213 set_opt(sb, NO_UID32);
ea663336 3214 /* xattr user namespace & acls are now defaulted on */
ea663336 3215 set_opt(sb, XATTR_USER);
03010a33 3216#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3217 set_opt(sb, POSIX_ACL);
2e7842b8 3218#endif
98c1a759
DW		 3219 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3220 if (ext4_has_metadata_csum(sb))
3221 set_opt(sb, JOURNAL_CHECKSUM);
3222
617ba13b 3223 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3224 set_opt(sb, JOURNAL_DATA);
617ba13b 3225 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3226 set_opt(sb, ORDERED_DATA);
617ba13b 3227 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3228 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3229
3230 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3231 set_opt(sb, ERRORS_PANIC);
bb4f397a 3232 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3233 set_opt(sb, ERRORS_CONT);
bb4f397a 3234 else
fd8c37ec 3235 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3236 /* block_validity enabled by default; disable with noblock_validity */
3237 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3238 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3239 set_opt(sb, DISCARD);
ac27a0ec 3240
08cefc7a
EB		 3241 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3242 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3243 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3244 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3245 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3246
8b67f04a 3247 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3248 set_opt(sb, BARRIER);
ac27a0ec 3249
dd919b98
AK		 3250 /*
3251 * enable delayed allocation by default
3252 * Use -o nodelalloc to turn it off
3253 */
bc0b75f7 3254 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3255 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3256 set_opt(sb, DELALLOC);
dd919b98 3257
51ce6511
LC		 3258 /*
3259 * set default s_li_wait_mult for lazyinit, for the case there is
3260 * no mount option specified.
3261 */
3262 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3263
8b67f04a 3264 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3265 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3266 ext4_msg(sb, KERN_WARNING,
3267 "failed to parse options in superblock: %s",
3268 sbi->s_es->s_mount_opts);
3269 }
5a916be1 3270 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3271 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3272 &journal_ioprio, 0))
ac27a0ec
DK		 3273 goto failed_mount;
3274
56889787
TT		 3275 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3276 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3277 "with data=journal disables delayed "
3278 "allocation and O_DIRECT support!\n");
3279 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3280 ext4_msg(sb, KERN_ERR, "can't mount with "
3281 "both data=journal and delalloc");
3282 goto failed_mount;
3283 }
3284 if (test_opt(sb, DIOREAD_NOLOCK)) {
3285 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3286 "both data=journal and dioread_nolock");
56889787
TT		 3287 goto failed_mount;
3288 }
923ae0ff
RZ		 3289 if (test_opt(sb, DAX)) {
3290 ext4_msg(sb, KERN_ERR, "can't mount with "
3291 "both data=journal and dax");
3292 goto failed_mount;
3293 }
56889787
TT		 3294 if (test_opt(sb, DELALLOC))
3295 clear_opt(sb, DELALLOC);
001e4a87
TH		 3296 } else {
3297 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3298 }
3299
ac27a0ec 3300 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3301 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3302
617ba13b
MC		 3303 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3304 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3305 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3306 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3307 ext4_msg(sb, KERN_WARNING,
3308 "feature flags set on rev 0 fs, "
3309 "running e2fsck is recommended");
469108ff 3310
ed3654eb
TT		 3311 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3312 set_opt2(sb, HURD_COMPAT);
3313 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3314 EXT4_FEATURE_INCOMPAT_64BIT)) {
3315 ext4_msg(sb, KERN_ERR,
3316 "The Hurd can't support 64-bit file systems");
3317 goto failed_mount;
3318 }
3319 }
3320
2035e776
TT		 3321 if (IS_EXT2_SB(sb)) {
3322 if (ext2_feature_set_ok(sb))
3323 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3324 "using the ext4 subsystem");
3325 else {
3326 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3327 "to feature incompatibilities");
3328 goto failed_mount;
3329 }
3330 }
3331
3332 if (IS_EXT3_SB(sb)) {
3333 if (ext3_feature_set_ok(sb))
3334 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3335 "using the ext4 subsystem");
3336 else {
3337 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3338 "to feature incompatibilities");
3339 goto failed_mount;
3340 }
3341 }
3342
ac27a0ec
DK		 3343 /*
3344 * Check feature flags regardless of the revision level, since we
3345 * previously didn't change the revision level when setting the flags,
3346 * so there is a chance incompat flags are set on a rev 0 filesystem.
3347 */
a13fb1a4 3348 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3349 goto failed_mount;
a13fb1a4 3350
261cb20c 3351 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3352 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3353 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3354 ext4_msg(sb, KERN_ERR,
3355 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3356 goto failed_mount;
3357 }
3358
923ae0ff
RZ		 3359 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3360 if (blocksize != PAGE_SIZE) {
3361 ext4_msg(sb, KERN_ERR,
3362 "error: unsupported blocksize for dax");
3363 goto failed_mount;
3364 }
3365 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3366 ext4_msg(sb, KERN_ERR,
3367 "error: device does not support dax");
3368 goto failed_mount;
3369 }
3370 }
3371
6ddb2447
TT		 3372 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT) &&
3373 es->s_encryption_level) {
3374 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3375 es->s_encryption_level);
3376 goto failed_mount;
3377 }
3378
ac27a0ec 3379 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3380 /* Validate the filesystem blocksize */
3381 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3382 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3383 blocksize);
ac27a0ec
DK		 3384 goto failed_mount;
3385 }
3386
2b2d6d01 3387 brelse(bh);
70bbb3e0
AM		 3388 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3389 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3390 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3391 if (!bh) {
b31e1552
ES		 3392 ext4_msg(sb, KERN_ERR,
3393 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3394 goto failed_mount;
3395 }
2716b802 3396 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3397 sbi->s_es = es;
617ba13b 3398 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3399 ext4_msg(sb, KERN_ERR,
3400 "Magic mismatch, very weird!");
ac27a0ec
DK		 3401 goto failed_mount;
3402 }
3403 }
3404
a13fb1a4
ES		 3405 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3406 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3407 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3408 has_huge_files);
3409 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3410
617ba13b
MC		 3411 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3412 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3413 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3414 } else {
3415 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3416 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3417 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3418 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3419 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3420 ext4_msg(sb, KERN_ERR,
3421 "unsupported inode size: %d",
2b2d6d01 3422 sbi->s_inode_size);
ac27a0ec
DK		 3423 goto failed_mount;
3424 }
ef7f3835
KS		 3425 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3426 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3427 }
0b8e58a1 3428
0d1ee42f
AR		 3429 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3430 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3431 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3432 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3433 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3434 ext4_msg(sb, KERN_ERR,
3435 "unsupported descriptor size %lu",
0d1ee42f
AR		 3436 sbi->s_desc_size);
3437 goto failed_mount;
3438 }
3439 } else
3440 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3441
ac27a0ec 3442 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3443 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3444 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3445 goto cantfind_ext4;
0b8e58a1 3446
617ba13b 3447 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3448 if (sbi->s_inodes_per_block == 0)
617ba13b 3449 goto cantfind_ext4;
ac27a0ec
DK		 3450 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3451 sbi->s_inodes_per_block;
0d1ee42f 3452 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3453 sbi->s_sbh = bh;
3454 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3455 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3456 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3457
2b2d6d01 3458 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3459 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3460 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3461 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3462 i = le32_to_cpu(es->s_flags);
3463 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3464 sbi->s_hash_unsigned = 3;
3465 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3466#ifdef __CHAR_UNSIGNED__
23301410
TT		 3467 if (!(sb->s_flags & MS_RDONLY))
3468 es->s_flags |=
3469 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3470 sbi->s_hash_unsigned = 3;
f99b2589 3471#else
23301410
TT		 3472 if (!(sb->s_flags & MS_RDONLY))
3473 es->s_flags |=
3474 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3475#endif
23301410 3476 }
f99b2589 3477 }
ac27a0ec 3478
281b5995
TT		 3479 /* Handle clustersize */
3480 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3481 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3482 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3483 if (has_bigalloc) {
3484 if (clustersize < blocksize) {
3485 ext4_msg(sb, KERN_ERR,
3486 "cluster size (%d) smaller than "
3487 "block size (%d)", clustersize, blocksize);
3488 goto failed_mount;
3489 }
3490 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3491 le32_to_cpu(es->s_log_block_size);
3492 sbi->s_clusters_per_group =
3493 le32_to_cpu(es->s_clusters_per_group);
3494 if (sbi->s_clusters_per_group > blocksize * 8) {
3495 ext4_msg(sb, KERN_ERR,
3496 "#clusters per group too big: %lu",
3497 sbi->s_clusters_per_group);
3498 goto failed_mount;
3499 }
3500 if (sbi->s_blocks_per_group !=
3501 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3502 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3503 "clusters per group (%lu) inconsistent",
3504 sbi->s_blocks_per_group,
3505 sbi->s_clusters_per_group);
3506 goto failed_mount;
3507 }
3508 } else {
3509 if (clustersize != blocksize) {
3510 ext4_warning(sb, "fragment/cluster size (%d) != "
3511 "block size (%d)", clustersize,
3512 blocksize);
3513 clustersize = blocksize;
3514 }
3515 if (sbi->s_blocks_per_group > blocksize * 8) {
3516 ext4_msg(sb, KERN_ERR,
3517 "#blocks per group too big: %lu",
3518 sbi->s_blocks_per_group);
3519 goto failed_mount;
3520 }
3521 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3522 sbi->s_cluster_bits = 0;
ac27a0ec 3523 }
281b5995
TT		 3524 sbi->s_cluster_ratio = clustersize / blocksize;
3525
ac27a0ec 3526 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3527 ext4_msg(sb, KERN_ERR,
3528 "#inodes per group too big: %lu",
2b2d6d01 3529 sbi->s_inodes_per_group);
ac27a0ec
DK		 3530 goto failed_mount;
3531 }
3532
960fd856
TT		 3533 /* Do we have standard group size of clustersize * 8 blocks ? */
3534 if (sbi->s_blocks_per_group == clustersize << 3)
3535 set_opt2(sb, STD_GROUP_SIZE);
3536
bf43d84b
ES		 3537 /*
3538 * Test whether we have more sectors than will fit in sector_t,
3539 * and whether the max offset is addressable by the page cache.
3540 */
5a9ae68a 3541 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3542 ext4_blocks_count(es));
5a9ae68a 3543 if (err) {
b31e1552 3544 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3545 " too large to mount safely on this system");
ac27a0ec 3546 if (sizeof(sector_t) < 8)
90c699a9 3547 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3548 goto failed_mount;
3549 }
3550
617ba13b
MC		 3551 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3552 goto cantfind_ext4;
e7c95593 3553
0f2ddca6
FTN		 3554 /* check blocks count against device size */
3555 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3556 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3557 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3558 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3559 ext4_blocks_count(es), blocks_count);
3560 goto failed_mount;
3561 }
3562
0b8e58a1
AD		 3563 /*
3564 * It makes no sense for the first data block to be beyond the end
3565 * of the filesystem.
3566 */
3567 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3568 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3569 "block %u is beyond end of filesystem (%llu)",
3570 le32_to_cpu(es->s_first_data_block),
3571 ext4_blocks_count(es));
e7c95593
ES		 3572 goto failed_mount;
3573 }
bd81d8ee
LV		 3574 blocks_count = (ext4_blocks_count(es) -
3575 le32_to_cpu(es->s_first_data_block) +
3576 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3577 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3578 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3579 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3580 "(block count %llu, first data block %u, "
b31e1552 3581 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3582 ext4_blocks_count(es),
3583 le32_to_cpu(es->s_first_data_block),
3584 EXT4_BLOCKS_PER_GROUP(sb));
3585 goto failed_mount;
3586 }
bd81d8ee 3587 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3588 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3589 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3590 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3591 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3592 sbi->s_group_desc = ext4_kvmalloc(db_count *
3593 sizeof(struct buffer_head *),
3594 GFP_KERNEL);
ac27a0ec 3595 if (sbi->s_group_desc == NULL) {
b31e1552 3596 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3597 ret = -ENOMEM;
ac27a0ec
DK		 3598 goto failed_mount;
3599 }
3600
705895b6 3601 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3602
3603 for (i = 0; i < db_count; i++) {
70bbb3e0 3604 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3605 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3606 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3607 ext4_msg(sb, KERN_ERR,
3608 "can't read group descriptor %d", i);
ac27a0ec
DK		 3609 db_count = i;
3610 goto failed_mount2;
3611 }
3612 }
bfff6873 3613 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3614 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
f9ae9cf5 3615 goto failed_mount2;
ac27a0ec 3616 }
772cb7c8 3617
f9ae9cf5 3618 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3619 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3620 spin_lock_init(&sbi->s_next_gen_lock);
3621
04ecddb7
JM		 3622 setup_timer(&sbi->s_err_report, print_daily_error_info,
3623 (unsigned long) sb);
04496411 3624
a75ae78f 3625 /* Register extent status tree shrinker */
eb68d0e2 3626 if (ext4_es_register_shrinker(sbi))
ce7e010a 3627 goto failed_mount3;
ce7e010a 3628
c9de560d 3629 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3630 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3631
f9ae9cf5
TT		 3632 /*
3633 * set up enough so that it can read an inode
3634 */
f6e63f90 3635 sb->s_op = &ext4_sops;
617ba13b
MC		 3636 sb->s_export_op = &ext4_export_ops;
3637 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3638#ifdef CONFIG_QUOTA
617ba13b 3639 sb->dq_op = &ext4_quota_operations;
262b4662 3640 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
1fa5efe3 3641 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3642 else
3643 sb->s_qcop = &ext4_qctl_operations;
96c7e0d9 3644 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
ac27a0ec 3645#endif
f2fa2ffc
AK		 3646 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3647
ac27a0ec 3648 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3649 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3650
3651 sb->s_root = NULL;
3652
3653 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3654 EXT4_HAS_INCOMPAT_FEATURE(sb,
3655 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3656
c5e06d10
JL		 3657 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3658 !(sb->s_flags & MS_RDONLY))
3659 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3660 goto failed_mount3a;
c5e06d10 3661
ac27a0ec
DK		 3662 /*
3663 * The first inode we look at is the journal inode. Don't try
3664 * root first: it may be modified in the journal!
3665 */
3666 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3667 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3668 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3669 goto failed_mount3a;
0390131b
FM		 3670 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3671 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3672 ext4_msg(sb, KERN_ERR, "required journal recovery "
3673 "suppressed and not mounted read-only");
744692dc 3674 goto failed_mount_wq;
ac27a0ec 3675 } else {
fd8c37ec 3676 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3677 sbi->s_journal = NULL;
3678 needs_recovery = 0;
3679 goto no_journal;
ac27a0ec
DK		 3680 }
3681
f32aaf2d 3682 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3683 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3684 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3685 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3686 goto failed_mount_wq;
eb40a09c
JS		 3687 }
3688
25ed6e8a
DW		 3689 if (!set_journal_csum_feature_set(sb)) {
3690 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3691 "feature set");
3692 goto failed_mount_wq;
d4da6c9c 3693 }
818d276c 3694
ac27a0ec
DK		 3695 /* We have now updated the journal if required, so we can
3696 * validate the data journaling mode. */
3697 switch (test_opt(sb, DATA_FLAGS)) {
3698 case 0:
3699 /* No mode set, assume a default based on the journal
63f57933
AM		 3700 * capabilities: ORDERED_DATA if the journal can
3701 * cope, else JOURNAL_DATA
3702 */
dab291af
MC		 3703 if (jbd2_journal_check_available_features
3704 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3705 set_opt(sb, ORDERED_DATA);
ac27a0ec 3706 else
fd8c37ec 3707 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3708 break;
3709
617ba13b
MC		 3710 case EXT4_MOUNT_ORDERED_DATA:
3711 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3712 if (!jbd2_journal_check_available_features
3713 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3714 ext4_msg(sb, KERN_ERR, "Journal does not support "
3715 "requested data journaling mode");
744692dc 3716 goto failed_mount_wq;
ac27a0ec
DK		 3717 }
3718 default:
3719 break;
3720 }
b3881f74 3721 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3722
18aadd47
BJ		 3723 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3724
ce7e010a 3725no_journal:
9c191f70
M		 3726 if (ext4_mballoc_ready) {
3727 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
3728 if (!sbi->s_mb_cache) {
3729 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3730 goto failed_mount_wq;
3731 }
3732 }
3733
1cb767cd
TT		 3734 if ((DUMMY_ENCRYPTION_ENABLED(sbi) ||
3735 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) &&
3736 (blocksize != PAGE_CACHE_SIZE)) {
3737 ext4_msg(sb, KERN_ERR,
3738 "Unsupported blocksize for fs encryption");
3739 goto failed_mount_wq;
3740 }
3741
3742 if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
6ddb2447
TT		 3743 !(sb->s_flags & MS_RDONLY) &&
3744 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
3745 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
3746 ext4_commit_super(sb, 1);
3747 }
3748
952fc18e
TT		 3749 /*
3750 * Get the # of file system overhead blocks from the
3751 * superblock if present.
3752 */
3753 if (es->s_overhead_clusters)
3754 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3755 else {
07aa2ea1
LC		 3756 err = ext4_calculate_overhead(sb);
3757 if (err)
952fc18e
TT		 3758 goto failed_mount_wq;
3759 }
3760
fd89d5f2
TH		 3761 /*
3762 * The maximum number of concurrent works can be high and
3763 * concurrency isn't really necessary. Limit it to 1.
3764 */
2e8fa54e
JK		 3765 EXT4_SB(sb)->rsv_conversion_wq =
3766 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3767 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3768 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3769 ret = -ENOMEM;
2e8fa54e
JK		 3770 goto failed_mount4;
3771 }
3772
ac27a0ec 3773 /*
dab291af 3774 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3775 * so we can safely mount the rest of the filesystem now.
3776 */
3777
1d1fe1ee
DH		 3778 root = ext4_iget(sb, EXT4_ROOT_INO);
3779 if (IS_ERR(root)) {
b31e1552 3780 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3781 ret = PTR_ERR(root);
32a9bb57 3782 root = NULL;
ac27a0ec
DK		 3783 goto failed_mount4;
3784 }
3785 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3786 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3787 iput(root);
ac27a0ec
DK		 3788 goto failed_mount4;
3789 }
48fde701 3790 sb->s_root = d_make_root(root);
1d1fe1ee 3791 if (!sb->s_root) {
b31e1552 3792 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3793 ret = -ENOMEM;
3794 goto failed_mount4;
3795 }
ac27a0ec 3796
7e84b621
ES		 3797 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3798 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3799
3800 /* determine the minimum size of new large inodes, if present */
3801 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3802 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3803 EXT4_GOOD_OLD_INODE_SIZE;
3804 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3805 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3806 if (sbi->s_want_extra_isize <
3807 le16_to_cpu(es->s_want_extra_isize))
3808 sbi->s_want_extra_isize =
3809 le16_to_cpu(es->s_want_extra_isize);
3810 if (sbi->s_want_extra_isize <
3811 le16_to_cpu(es->s_min_extra_isize))
3812 sbi->s_want_extra_isize =
3813 le16_to_cpu(es->s_min_extra_isize);
3814 }
3815 }
3816 /* Check if enough inode space is available */
3817 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3818 sbi->s_inode_size) {
3819 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3820 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3821 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3822 "available");
ef7f3835
KS		 3823 }
3824
b5799018 3825 ext4_set_resv_clusters(sb);
27dd4385 3826
6fd058f7
TT		 3827 err = ext4_setup_system_zone(sb);
3828 if (err) {
b31e1552 3829 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3830 "zone (%d)", err);
f9ae9cf5
TT		 3831 goto failed_mount4a;
3832 }
3833
3834 ext4_ext_init(sb);
3835 err = ext4_mb_init(sb);
3836 if (err) {
3837 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3838 err);
dcf2d804 3839 goto failed_mount5;
c2774d84
AK		 3840 }
3841
d5e03cbb
TT		 3842 block = ext4_count_free_clusters(sb);
3843 ext4_free_blocks_count_set(sbi->s_es,
3844 EXT4_C2B(sbi, block));
908c7f19
TH		 3845 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
3846 GFP_KERNEL);
d5e03cbb
TT		 3847 if (!err) {
3848 unsigned long freei = ext4_count_free_inodes(sb);
3849 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 3850 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
3851 GFP_KERNEL);
d5e03cbb
TT		 3852 }
3853 if (!err)
3854 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 3855 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 3856 if (!err)
908c7f19
TH		 3857 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
3858 GFP_KERNEL);
d5e03cbb
TT		 3859 if (err) {
3860 ext4_msg(sb, KERN_ERR, "insufficient memory");
3861 goto failed_mount6;
3862 }
3863
3864 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3865 if (!ext4_fill_flex_info(sb)) {
3866 ext4_msg(sb, KERN_ERR,
3867 "unable to initialize "
3868 "flex_bg meta info!");
3869 goto failed_mount6;
3870 }
3871
bfff6873
LC		 3872 err = ext4_register_li_request(sb, first_not_zeroed);
3873 if (err)
dcf2d804 3874 goto failed_mount6;
bfff6873 3875
b5799018 3876 err = ext4_register_sysfs(sb);
dcf2d804
TM		 3877 if (err)
3878 goto failed_mount7;
3197ebdb 3879
9b2ff357
JK		 3880#ifdef CONFIG_QUOTA
3881 /* Enable quota usage during mount. */
3882 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
3883 !(sb->s_flags & MS_RDONLY)) {
3884 err = ext4_enable_quotas(sb);
3885 if (err)
3886 goto failed_mount8;
3887 }
3888#endif /* CONFIG_QUOTA */
3889
617ba13b
MC		 3890 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3891 ext4_orphan_cleanup(sb, es);
3892 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3893 if (needs_recovery) {
b31e1552 3894 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3895 ext4_mark_recovery_complete(sb, es);
3896 }
3897 if (EXT4_SB(sb)->s_journal) {
3898 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3899 descr = " journalled data mode";
3900 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3901 descr = " ordered data mode";
3902 else
3903 descr = " writeback data mode";
3904 } else
3905 descr = "out journal";
3906
79add3a3
LC		 3907 if (test_opt(sb, DISCARD)) {
3908 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3909 if (!blk_queue_discard(q))
3910 ext4_msg(sb, KERN_WARNING,
3911 "mounting with \"discard\" option, but "
3912 "the device does not support discard");
3913 }
3914
e294a537
TT		 3915 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
3916 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3917 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3918 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3919
66e61a9e
TT		 3920 if (es->s_error_count)
3921 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3922
efbed4dc
TT		 3923 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3924 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
3925 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
3926 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
3927
d4c402d9 3928 kfree(orig_data);
ac27a0ec
DK		 3929 return 0;
3930
617ba13b 3931cantfind_ext4:
ac27a0ec 3932 if (!silent)
b31e1552 3933 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3934 goto failed_mount;
3935
72ba7450
TT		 3936#ifdef CONFIG_QUOTA
3937failed_mount8:
ebd173be 3938 ext4_unregister_sysfs(sb);
72ba7450 3939#endif
dcf2d804
TM		 3940failed_mount7:
3941 ext4_unregister_li_request(sb);
3942failed_mount6:
f9ae9cf5 3943 ext4_mb_release(sb);
d5e03cbb 3944 if (sbi->s_flex_groups)
b93b41d4 3945 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 3946 percpu_counter_destroy(&sbi->s_freeclusters_counter);
3947 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3948 percpu_counter_destroy(&sbi->s_dirs_counter);
3949 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 3950failed_mount5:
f9ae9cf5
TT		 3951 ext4_ext_release(sb);
3952 ext4_release_system_zone(sb);
3953failed_mount4a:
94bf608a 3954 dput(sb->s_root);
32a9bb57 3955 sb->s_root = NULL;
94bf608a 3956failed_mount4:
b31e1552 3957 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 3958 if (EXT4_SB(sb)->rsv_conversion_wq)
3959 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 3960failed_mount_wq:
0390131b
FM		 3961 if (sbi->s_journal) {
3962 jbd2_journal_destroy(sbi->s_journal);
3963 sbi->s_journal = NULL;
3964 }
50460fe8 3965failed_mount3a:
d3922a77 3966 ext4_es_unregister_shrinker(sbi);
eb68d0e2 3967failed_mount3:
9105bb14 3968 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 3969 if (sbi->s_mmp_tsk)
3970 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3971failed_mount2:
3972 for (i = 0; i < db_count; i++)
3973 brelse(sbi->s_group_desc[i]);
b93b41d4 3974 kvfree(sbi->s_group_desc);
ac27a0ec 3975failed_mount:
0441984a
DW		 3976 if (sbi->s_chksum_driver)
3977 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 3978#ifdef CONFIG_QUOTA
a2d4a646 3979 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 3980 kfree(sbi->s_qf_names[i]);
3981#endif
617ba13b 3982 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3983 brelse(bh);
3984out_fail:
3985 sb->s_fs_info = NULL;
f6830165 3986 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3987 kfree(sbi);
dcc7dae3 3988out_free_orig:
d4c402d9 3989 kfree(orig_data);
07aa2ea1 3990 return err ? err : ret;
ac27a0ec
DK		 3991}
3992
3993/*
3994 * Setup any per-fs journal parameters now. We'll do this both on
3995 * initial mount, once the journal has been initialised but before we've
3996 * done any recovery; and again on any subsequent remount.
3997 */
617ba13b 3998static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3999{
617ba13b 4000 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4001
30773840
TT		 4002 journal->j_commit_interval = sbi->s_commit_interval;
4003 journal->j_min_batch_time = sbi->s_min_batch_time;
4004 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4005
a931da6a 4006 write_lock(&journal->j_state_lock);
ac27a0ec 4007 if (test_opt(sb, BARRIER))
dab291af 4008 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4009 else
dab291af 4010 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4011 if (test_opt(sb, DATA_ERR_ABORT))
4012 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4013 else
4014 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4015 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4016}
4017
617ba13b 4018static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4019 unsigned int journal_inum)
4020{
4021 struct inode *journal_inode;
4022 journal_t *journal;
4023
0390131b
FM		 4024 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4025
ac27a0ec
DK		 4026 /* First, test for the existence of a valid inode on disk. Bad
4027 * things happen if we iget() an unused inode, as the subsequent
4028 * iput() will try to delete it. */
4029
1d1fe1ee
DH		 4030 journal_inode = ext4_iget(sb, journal_inum);
4031 if (IS_ERR(journal_inode)) {
b31e1552 4032 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4033 return NULL;
4034 }
4035 if (!journal_inode->i_nlink) {
4036 make_bad_inode(journal_inode);
4037 iput(journal_inode);
b31e1552 4038 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4039 return NULL;
4040 }
4041
e5f8eab8 4042 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4043 journal_inode, journal_inode->i_size);
1d1fe1ee 4044 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4045 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4046 iput(journal_inode);
4047 return NULL;
4048 }
4049
dab291af 4050 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4051 if (!journal) {
b31e1552 4052 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4053 iput(journal_inode);
4054 return NULL;
4055 }
4056 journal->j_private = sb;
617ba13b 4057 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4058 return journal;
4059}
4060
617ba13b 4061static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4062 dev_t j_dev)
4063{
2b2d6d01 4064 struct buffer_head *bh;
ac27a0ec 4065 journal_t *journal;
617ba13b
MC		 4066 ext4_fsblk_t start;
4067 ext4_fsblk_t len;
ac27a0ec 4068 int hblock, blocksize;
617ba13b 4069 ext4_fsblk_t sb_block;
ac27a0ec 4070 unsigned long offset;
2b2d6d01 4071 struct ext4_super_block *es;
ac27a0ec
DK		 4072 struct block_device *bdev;
4073
0390131b
FM		 4074 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4075
b31e1552 4076 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4077 if (bdev == NULL)
4078 return NULL;
4079
ac27a0ec 4080 blocksize = sb->s_blocksize;
e1defc4f 4081 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4082 if (blocksize < hblock) {
b31e1552
ES		 4083 ext4_msg(sb, KERN_ERR,
4084 "blocksize too small for journal device");
ac27a0ec
DK		 4085 goto out_bdev;
4086 }
4087
617ba13b
MC		 4088 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4089 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4090 set_blocksize(bdev, blocksize);
4091 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4092 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4093 "external journal");
ac27a0ec
DK		 4094 goto out_bdev;
4095 }
4096
2716b802 4097 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4098 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4099 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4100 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4101 ext4_msg(sb, KERN_ERR, "external journal has "
4102 "bad superblock");
ac27a0ec
DK		 4103 brelse(bh);
4104 goto out_bdev;
4105 }
4106
df4763be
DW		 4107 if ((le32_to_cpu(es->s_feature_ro_compat) &
4108 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4109 es->s_checksum != ext4_superblock_csum(sb, es)) {
4110 ext4_msg(sb, KERN_ERR, "external journal has "
4111 "corrupt superblock");
4112 brelse(bh);
4113 goto out_bdev;
4114 }
4115
617ba13b 4116 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4117 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4118 brelse(bh);
4119 goto out_bdev;
4120 }
4121
bd81d8ee 4122 len = ext4_blocks_count(es);
ac27a0ec
DK		 4123 start = sb_block + 1;
4124 brelse(bh); /* we're done with the superblock */
4125
dab291af 4126 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4127 start, len, blocksize);
4128 if (!journal) {
b31e1552 4129 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4130 goto out_bdev;
4131 }
4132 journal->j_private = sb;
9f203507 4133 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4134 wait_on_buffer(journal->j_sb_buffer);
4135 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4136 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4137 goto out_journal;
4138 }
4139 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4140 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4141 "user (unsupported) - %d",
ac27a0ec
DK		 4142 be32_to_cpu(journal->j_superblock->s_nr_users));
4143 goto out_journal;
4144 }
617ba13b
MC		 4145 EXT4_SB(sb)->journal_bdev = bdev;
4146 ext4_init_journal_params(sb, journal);
ac27a0ec 4147 return journal;
0b8e58a1 4148
ac27a0ec 4149out_journal:
dab291af 4150 jbd2_journal_destroy(journal);
ac27a0ec 4151out_bdev:
617ba13b 4152 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4153 return NULL;
4154}
4155
617ba13b
MC		 4156static int ext4_load_journal(struct super_block *sb,
4157 struct ext4_super_block *es,
ac27a0ec
DK		 4158 unsigned long journal_devnum)
4159{
4160 journal_t *journal;
4161 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4162 dev_t journal_dev;
4163 int err = 0;
4164 int really_read_only;
4165
0390131b
FM		 4166 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4167
ac27a0ec
DK		 4168 if (journal_devnum &&
4169 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4170 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4171 "numbers have changed");
ac27a0ec
DK		 4172 journal_dev = new_decode_dev(journal_devnum);
4173 } else
4174 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4175
4176 really_read_only = bdev_read_only(sb->s_bdev);
4177
4178 /*
4179 * Are we loading a blank journal or performing recovery after a
4180 * crash? For recovery, we need to check in advance whether we
4181 * can get read-write access to the device.
4182 */
617ba13b 4183 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4184 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4185 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4186 "required on readonly filesystem");
ac27a0ec 4187 if (really_read_only) {
b31e1552
ES		 4188 ext4_msg(sb, KERN_ERR, "write access "
4189 "unavailable, cannot proceed");
ac27a0ec
DK		 4190 return -EROFS;
4191 }
b31e1552
ES		 4192 ext4_msg(sb, KERN_INFO, "write access will "
4193 "be enabled during recovery");
ac27a0ec
DK		 4194 }
4195 }
4196
4197 if (journal_inum && journal_dev) {
b31e1552
ES		 4198 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4199 "and inode journals!");
ac27a0ec
DK		 4200 return -EINVAL;
4201 }
4202
4203 if (journal_inum) {
617ba13b 4204 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4205 return -EINVAL;
4206 } else {
617ba13b 4207 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4208 return -EINVAL;
4209 }
4210
90576c0b 4211 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4212 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4213
617ba13b 4214 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4215 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4216 if (!err) {
4217 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4218 if (save)
4219 memcpy(save, ((char *) es) +
4220 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4221 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4222 if (save)
4223 memcpy(((char *) es) + EXT4_S_ERR_START,
4224 save, EXT4_S_ERR_LEN);
4225 kfree(save);
4226 }
ac27a0ec
DK		 4227
4228 if (err) {
b31e1552 4229 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4230 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4231 return err;
4232 }
4233
617ba13b
MC		 4234 EXT4_SB(sb)->s_journal = journal;
4235 ext4_clear_journal_err(sb, es);
ac27a0ec 4236
c41303ce 4237 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4238 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4239 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4240
4241 /* Make sure we flush the recovery flag to disk. */
e2d67052 4242 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4243 }
4244
4245 return 0;
4246}
4247
e2d67052 4248static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4249{
e2d67052 4250 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4251 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4252 int error = 0;
ac27a0ec 4253
bdfe0cbd 4254 if (!sbh || block_device_ejected(sb))
c4be0c1d 4255 return error;
914258bf
TT		 4256 if (buffer_write_io_error(sbh)) {
4257 /*
4258 * Oh, dear. A previous attempt to write the
4259 * superblock failed. This could happen because the
4260 * USB device was yanked out. Or it could happen to
4261 * be a transient write error and maybe the block will
4262 * be remapped. Nothing we can do but to retry the
4263 * write and hope for the best.
4264 */
b31e1552
ES		 4265 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4266 "superblock detected");
914258bf
TT		 4267 clear_buffer_write_io_error(sbh);
4268 set_buffer_uptodate(sbh);
4269 }
71290b36
TT		 4270 /*
4271 * If the file system is mounted read-only, don't update the
4272 * superblock write time. This avoids updating the superblock
4273 * write time when we are mounting the root file system
4274 * read/only but we need to replay the journal; at that point,
4275 * for people who are east of GMT and who make their clock
4276 * tick in localtime for Windows bug-for-bug compatibility,
4277 * the clock is set in the future, and this will cause e2fsck
4278 * to complain and force a full file system check.
4279 */
4280 if (!(sb->s_flags & MS_RDONLY))
4281 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4282 if (sb->s_bdev->bd_part)
4283 es->s_kbytes_written =
4284 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4285 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4286 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4287 else
4288 es->s_kbytes_written =
4289 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4290 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4291 ext4_free_blocks_count_set(es,
57042651
TT		 4292 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4293 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4294 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4295 es->s_free_inodes_count =
4296 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4297 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4298 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4299 ext4_superblock_csum_set(sb);
ac27a0ec 4300 mark_buffer_dirty(sbh);
914258bf 4301 if (sync) {
564bc402
DJ		 4302 error = __sync_dirty_buffer(sbh,
4303 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4304 if (error)
4305 return error;
4306
4307 error = buffer_write_io_error(sbh);
4308 if (error) {
b31e1552
ES		 4309 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4310 "superblock");
914258bf
TT		 4311 clear_buffer_write_io_error(sbh);
4312 set_buffer_uptodate(sbh);
4313 }
4314 }
c4be0c1d 4315 return error;
ac27a0ec
DK		 4316}
4317
ac27a0ec
DK		 4318/*
4319 * Have we just finished recovery? If so, and if we are mounting (or
4320 * remounting) the filesystem readonly, then we will end up with a
4321 * consistent fs on disk. Record that fact.
4322 */
2b2d6d01
TT		 4323static void ext4_mark_recovery_complete(struct super_block *sb,
4324 struct ext4_super_block *es)
ac27a0ec 4325{
617ba13b 4326 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4327
0390131b
FM		 4328 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4329 BUG_ON(journal != NULL);
4330 return;
4331 }
dab291af 4332 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4333 if (jbd2_journal_flush(journal) < 0)
4334 goto out;
4335
617ba13b 4336 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4337 sb->s_flags & MS_RDONLY) {
617ba13b 4338 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4339 ext4_commit_super(sb, 1);
ac27a0ec 4340 }
7ffe1ea8
HK		 4341
4342out:
dab291af 4343 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4344}
4345
4346/*
4347 * If we are mounting (or read-write remounting) a filesystem whose journal
4348 * has recorded an error from a previous lifetime, move that error to the
4349 * main filesystem now.
4350 */
2b2d6d01
TT		 4351static void ext4_clear_journal_err(struct super_block *sb,
4352 struct ext4_super_block *es)
ac27a0ec
DK		 4353{
4354 journal_t *journal;
4355 int j_errno;
4356 const char *errstr;
4357
0390131b
FM		 4358 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4359
617ba13b 4360 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4361
4362 /*
4363 * Now check for any error status which may have been recorded in the
617ba13b 4364 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4365 */
4366
dab291af 4367 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4368 if (j_errno) {
4369 char nbuf[16];
4370
617ba13b 4371 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4372 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4373 "from previous mount: %s", errstr);
12062ddd 4374 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4375
617ba13b
MC		 4376 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4377 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4378 ext4_commit_super(sb, 1);
ac27a0ec 4379
dab291af 4380 jbd2_journal_clear_err(journal);
d796c52e 4381 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4382 }
4383}
4384
4385/*
4386 * Force the running and committing transactions to commit,
4387 * and wait on the commit.
4388 */
617ba13b 4389int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4390{
4391 journal_t *journal;
ac27a0ec
DK		 4392
4393 if (sb->s_flags & MS_RDONLY)
4394 return 0;
4395
617ba13b 4396 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4397 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4398}
4399
617ba13b 4400static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4401{
14ce0cb4 4402 int ret = 0;
9eddacf9 4403 tid_t target;
06a407f1 4404 bool needs_barrier = false;
8d5d02e6 4405 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4406
9bffad1e 4407 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4408 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4409 /*
4410 * Writeback quota in non-journalled quota case - journalled quota has
4411 * no dirty dquots
4412 */
4413 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4414 /*
4415 * Data writeback is possible w/o journal transaction, so barrier must
4416 * being sent at the end of the function. But we can skip it if
4417 * transaction_commit will do it for us.
4418 */
bda32530
TT		 4419 if (sbi->s_journal) {
4420 target = jbd2_get_latest_transaction(sbi->s_journal);
4421 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4422 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4423 needs_barrier = true;
4424
4425 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4426 if (wait)
4427 ret = jbd2_log_wait_commit(sbi->s_journal,
4428 target);
4429 }
4430 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4431 needs_barrier = true;
06a407f1
DM		 4432 if (needs_barrier) {
4433 int err;
4434 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4435 if (!ret)
4436 ret = err;
0390131b 4437 }
06a407f1
DM		 4438
4439 return ret;
4440}
4441
ac27a0ec
DK		 4442/*
4443 * LVM calls this function before a (read-only) snapshot is created. This
4444 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4445 *
4446 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4447 * state independently. It relies on upper layer to stop all data & metadata
4448 * modifications.
ac27a0ec 4449 */
c4be0c1d 4450static int ext4_freeze(struct super_block *sb)
ac27a0ec 4451{
c4be0c1d
TS		 4452 int error = 0;
4453 journal_t *journal;
ac27a0ec 4454
9ca92389
TT		 4455 if (sb->s_flags & MS_RDONLY)
4456 return 0;
ac27a0ec 4457
9ca92389 4458 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4459
bb044576
TT		 4460 if (journal) {
4461 /* Now we set up the journal barrier. */
4462 jbd2_journal_lock_updates(journal);
ac27a0ec 4463
bb044576
TT		 4464 /*
4465 * Don't clear the needs_recovery flag if we failed to
4466 * flush the journal.
4467 */
4468 error = jbd2_journal_flush(journal);
4469 if (error < 0)
4470 goto out;
c642dc9e
ES		 4471
4472 /* Journal blocked and flushed, clear needs_recovery flag. */
4473 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
bb044576 4474 }
9ca92389 4475
9ca92389 4476 error = ext4_commit_super(sb, 1);
6b0310fb 4477out:
bb044576
TT		 4478 if (journal)
4479 /* we rely on upper layer to stop further updates */
4480 jbd2_journal_unlock_updates(journal);
6b0310fb 4481 return error;
ac27a0ec
DK		 4482}
4483
4484/*
4485 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4486 * flag here, even though the filesystem is not technically dirty yet.
4487 */
c4be0c1d 4488static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4489{
9ca92389
TT		 4490 if (sb->s_flags & MS_RDONLY)
4491 return 0;
4492
c642dc9e
ES		 4493 if (EXT4_SB(sb)->s_journal) {
4494 /* Reset the needs_recovery flag before the fs is unlocked. */
4495 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4496 }
4497
9ca92389 4498 ext4_commit_super(sb, 1);
c4be0c1d 4499 return 0;
ac27a0ec
DK		 4500}
4501
673c6100
TT		 4502/*
4503 * Structure to save mount options for ext4_remount's benefit
4504 */
4505struct ext4_mount_options {
4506 unsigned long s_mount_opt;
a2595b8a 4507 unsigned long s_mount_opt2;
08cefc7a
EB		 4508 kuid_t s_resuid;
4509 kgid_t s_resgid;
673c6100
TT		 4510 unsigned long s_commit_interval;
4511 u32 s_min_batch_time, s_max_batch_time;
4512#ifdef CONFIG_QUOTA
4513 int s_jquota_fmt;
a2d4a646 4514 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4515#endif
4516};
4517
2b2d6d01 4518static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4519{
2b2d6d01 4520 struct ext4_super_block *es;
617ba13b 4521 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4522 unsigned long old_sb_flags;
617ba13b 4523 struct ext4_mount_options old_opts;
c79d967d 4524 int enable_quota = 0;
8a266467 4525 ext4_group_t g;
b3881f74 4526 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4527 int err = 0;
ac27a0ec 4528#ifdef CONFIG_QUOTA
03dafb5f 4529 int i, j;
ac27a0ec 4530#endif
d4c402d9 4531 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4532
4533 /* Store the original options */
4534 old_sb_flags = sb->s_flags;
4535 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4536 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4537 old_opts.s_resuid = sbi->s_resuid;
4538 old_opts.s_resgid = sbi->s_resgid;
4539 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4540 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4541 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4542#ifdef CONFIG_QUOTA
4543 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4544 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4545 if (sbi->s_qf_names[i]) {
4546 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4547 GFP_KERNEL);
4548 if (!old_opts.s_qf_names[i]) {
4549 for (j = 0; j < i; j++)
4550 kfree(old_opts.s_qf_names[j]);
3e36a163 4551 kfree(orig_data);
03dafb5f
CG		 4552 return -ENOMEM;
4553 }
4554 } else
4555 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4556#endif
b3881f74
TT		 4557 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4558 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4559
661aa520 4560 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4561 err = -EINVAL;
4562 goto restore_opts;
4563 }
4564
6b992ff2 4565 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4566 test_opt(sb, JOURNAL_CHECKSUM)) {
4567 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4568 "during remount not supported; ignoring");
4569 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4570 }
4571
6ae6514b
PS		 4572 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4573 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4574 ext4_msg(sb, KERN_ERR, "can't mount with "
4575 "both data=journal and delalloc");
4576 err = -EINVAL;
4577 goto restore_opts;
4578 }
4579 if (test_opt(sb, DIOREAD_NOLOCK)) {
4580 ext4_msg(sb, KERN_ERR, "can't mount with "
4581 "both data=journal and dioread_nolock");
4582 err = -EINVAL;
4583 goto restore_opts;
4584 }
923ae0ff
RZ		 4585 if (test_opt(sb, DAX)) {
4586 ext4_msg(sb, KERN_ERR, "can't mount with "
4587 "both data=journal and dax");
4588 err = -EINVAL;
4589 goto restore_opts;
4590 }
4591 }
4592
4593 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4594 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4595 "dax flag with busy inodes while remounting");
4596 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4597 }
4598
4ab2f15b 4599 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4600 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4601
4602 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4603 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4604
4605 es = sbi->s_es;
4606
b3881f74 4607 if (sbi->s_journal) {
0390131b 4608 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4609 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4610 }
ac27a0ec 4611
a2fd66d0
TT		 4612 if (*flags & MS_LAZYTIME)
4613 sb->s_flags |= MS_LAZYTIME;
4614
661aa520 4615 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4616 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4617 err = -EROFS;
4618 goto restore_opts;
4619 }
4620
4621 if (*flags & MS_RDONLY) {
38c03b34
TT		 4622 err = sync_filesystem(sb);
4623 if (err < 0)
4624 goto restore_opts;
0f0dd62f
CH		 4625 err = dquot_suspend(sb, -1);
4626 if (err < 0)
c79d967d 4627 goto restore_opts;
c79d967d 4628
ac27a0ec
DK		 4629 /*
4630 * First of all, the unconditional stuff we have to do
4631 * to disable replay of the journal when we next remount
4632 */
4633 sb->s_flags |= MS_RDONLY;
4634
4635 /*
4636 * OK, test if we are remounting a valid rw partition
4637 * readonly, and if so set the rdonly flag and then
4638 * mark the partition as valid again.
4639 */
617ba13b
MC		 4640 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4641 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4642 es->s_state = cpu_to_le16(sbi->s_mount_state);
4643
a63c9eb2 4644 if (sbi->s_journal)
0390131b 4645 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4646 } else {
a13fb1a4 4647 /* Make sure we can mount this feature set readwrite */
2cb5cc8b
DW		 4648 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4649 EXT4_FEATURE_RO_COMPAT_READONLY) ||
4650 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4651 err = -EROFS;
4652 goto restore_opts;
4653 }
8a266467
TT		 4654 /*
4655 * Make sure the group descriptor checksums
0b8e58a1 4656 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4657 */
4658 for (g = 0; g < sbi->s_groups_count; g++) {
4659 struct ext4_group_desc *gdp =
4660 ext4_get_group_desc(sb, g, NULL);
4661
feb0ab32 4662 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4663 ext4_msg(sb, KERN_ERR,
4664 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4665 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4666 le16_to_cpu(gdp->bg_checksum));
4667 err = -EINVAL;
4668 goto restore_opts;
4669 }
4670 }
4671
ead6596b
ES		 4672 /*
4673 * If we have an unprocessed orphan list hanging
4674 * around from a previously readonly bdev mount,
4675 * require a full umount/remount for now.
4676 */
4677 if (es->s_last_orphan) {
b31e1552 4678 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4679 "remount RDWR because of unprocessed "
4680 "orphan inode list. Please "
b31e1552 4681 "umount/remount instead");
ead6596b
ES		 4682 err = -EINVAL;
4683 goto restore_opts;
4684 }
4685
ac27a0ec
DK		 4686 /*
4687 * Mounting a RDONLY partition read-write, so reread
4688 * and store the current valid flag. (It may have
4689 * been changed by e2fsck since we originally mounted
4690 * the partition.)
4691 */
0390131b
FM		 4692 if (sbi->s_journal)
4693 ext4_clear_journal_err(sb, es);
ac27a0ec 4694 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4695 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4696 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4697 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4698 EXT4_FEATURE_INCOMPAT_MMP))
4699 if (ext4_multi_mount_protect(sb,
4700 le64_to_cpu(es->s_mmp_block))) {
4701 err = -EROFS;
4702 goto restore_opts;
4703 }
c79d967d 4704 enable_quota = 1;
ac27a0ec
DK		 4705 }
4706 }
bfff6873
LC		 4707
4708 /*
4709 * Reinitialize lazy itable initialization thread based on
4710 * current settings
4711 */
4712 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4713 ext4_unregister_li_request(sb);
4714 else {
4715 ext4_group_t first_not_zeroed;
4716 first_not_zeroed = ext4_has_uninit_itable(sb);
4717 ext4_register_li_request(sb, first_not_zeroed);
4718 }
4719
6fd058f7 4720 ext4_setup_system_zone(sb);
d096ad0f 4721 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4722 ext4_commit_super(sb, 1);
0390131b 4723
ac27a0ec
DK		 4724#ifdef CONFIG_QUOTA
4725 /* Release old quota file names */
a2d4a646 4726 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4727 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4728 if (enable_quota) {
4729 if (sb_any_quota_suspended(sb))
4730 dquot_resume(sb, -1);
4731 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4732 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4733 err = ext4_enable_quotas(sb);
07724f98 4734 if (err)
7c319d32 4735 goto restore_opts;
7c319d32
AK		 4736 }
4737 }
ac27a0ec 4738#endif
d4c402d9 4739
a26f4992 4740 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4741 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4742 kfree(orig_data);
ac27a0ec 4743 return 0;
0b8e58a1 4744
ac27a0ec
DK		 4745restore_opts:
4746 sb->s_flags = old_sb_flags;
4747 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4748 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4749 sbi->s_resuid = old_opts.s_resuid;
4750 sbi->s_resgid = old_opts.s_resgid;
4751 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4752 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4753 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4754#ifdef CONFIG_QUOTA
4755 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 4756 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 4757 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4758 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4759 }
4760#endif
d4c402d9 4761 kfree(orig_data);
ac27a0ec
DK		 4762 return err;
4763}
4764
2b2d6d01 4765static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4766{
4767 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4768 struct ext4_sb_info *sbi = EXT4_SB(sb);
4769 struct ext4_super_block *es = sbi->s_es;
27dd4385 4770 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4771 u64 fsid;
d02a9391 4772 s64 bfree;
27dd4385 4773 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4774
952fc18e
TT		 4775 if (!test_opt(sb, MINIX_DF))
4776 overhead = sbi->s_overhead;
ac27a0ec 4777
617ba13b 4778 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4779 buf->f_bsize = sb->s_blocksize;
b72f78cb 4780 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4781 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4782 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4783 /* prevent underflow in case that few free space is available */
57042651 4784 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4785 buf->f_bavail = buf->f_bfree -
4786 (ext4_r_blocks_count(es) + resv_blocks);
4787 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4788 buf->f_bavail = 0;
4789 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4790 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4791 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4792 fsid = le64_to_cpup((void *)es->s_uuid) ^
4793 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4794 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4795 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4796
ac27a0ec
DK		 4797 return 0;
4798}
4799
0b8e58a1
AD		 4800/* Helper function for writing quotas on sync - we need to start transaction
4801 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4802 * Process 1 Process 2
617ba13b 4803 * ext4_create() quota_sync()
a269eb18 4804 * jbd2_journal_start() write_dquot()
871a2931 4805 * dquot_initialize() down(dqio_mutex)
dab291af 4806 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4807 *
4808 */
4809
4810#ifdef CONFIG_QUOTA
4811
4812static inline struct inode *dquot_to_inode(struct dquot *dquot)
4813{
4c376dca 4814 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4815}
4816
617ba13b 4817static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4818{
4819 int ret, err;
4820 handle_t *handle;
4821 struct inode *inode;
4822
4823 inode = dquot_to_inode(dquot);
9924a92a 4824 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4825 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4826 if (IS_ERR(handle))
4827 return PTR_ERR(handle);
4828 ret = dquot_commit(dquot);
617ba13b 4829 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4830 if (!ret)
4831 ret = err;
4832 return ret;
4833}
4834
617ba13b 4835static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4836{
4837 int ret, err;
4838 handle_t *handle;
4839
9924a92a 4840 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4841 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4842 if (IS_ERR(handle))
4843 return PTR_ERR(handle);
4844 ret = dquot_acquire(dquot);
617ba13b 4845 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4846 if (!ret)
4847 ret = err;
4848 return ret;
4849}
4850
617ba13b 4851static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4852{
4853 int ret, err;
4854 handle_t *handle;
4855
9924a92a 4856 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4857 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4858 if (IS_ERR(handle)) {
4859 /* Release dquot anyway to avoid endless cycle in dqput() */
4860 dquot_release(dquot);
ac27a0ec 4861 return PTR_ERR(handle);
9c3013e9 4862 }
ac27a0ec 4863 ret = dquot_release(dquot);
617ba13b 4864 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4865 if (!ret)
4866 ret = err;
4867 return ret;
4868}
4869
617ba13b 4870static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4871{
262b4662
JK		 4872 struct super_block *sb = dquot->dq_sb;
4873 struct ext4_sb_info *sbi = EXT4_SB(sb);
4874
2c8be6b2 4875 /* Are we journaling quotas? */
262b4662
JK		 4876 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
4877 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4878 dquot_mark_dquot_dirty(dquot);
617ba13b 4879 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4880 } else {
4881 return dquot_mark_dquot_dirty(dquot);
4882 }
4883}
4884
617ba13b 4885static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4886{
4887 int ret, err;
4888 handle_t *handle;
4889
4890 /* Data block + inode block */
2b0143b5 4891 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 4892 if (IS_ERR(handle))
4893 return PTR_ERR(handle);
4894 ret = dquot_commit_info(sb, type);
617ba13b 4895 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4896 if (!ret)
4897 ret = err;
4898 return ret;
4899}
4900
4901/*
4902 * Turn on quotas during mount time - we need to find
4903 * the quota file and such...
4904 */
617ba13b 4905static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4906{
287a8095
CH		 4907 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4908 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4909}
4910
4911/*
4912 * Standard function to be called on quota_on
4913 */
617ba13b 4914static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4915 struct path *path)
ac27a0ec
DK		 4916{
4917 int err;
ac27a0ec
DK		 4918
4919 if (!test_opt(sb, QUOTA))
4920 return -EINVAL;
0623543b 4921
ac27a0ec 4922 /* Quotafile not on the same filesystem? */
d8c9584e 4923 if (path->dentry->d_sb != sb)
ac27a0ec 4924 return -EXDEV;
0623543b
JK		 4925 /* Journaling quota? */
4926 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4927 /* Quotafile not in fs root? */
f00c9e44 4928 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4929 ext4_msg(sb, KERN_WARNING,
4930 "Quota file not on filesystem root. "
4931 "Journaled quota will not work");
2b2d6d01 4932 }
0623543b
JK		 4933
4934 /*
4935 * When we journal data on quota file, we have to flush journal to see
4936 * all updates to the file when we bypass pagecache...
4937 */
0390131b 4938 if (EXT4_SB(sb)->s_journal &&
2b0143b5 4939 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 4940 /*
4941 * We don't need to lock updates but journal_flush() could
4942 * otherwise be livelocked...
4943 */
4944 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4945 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4946 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4947 if (err)
7ffe1ea8 4948 return err;
0623543b
JK		 4949 }
4950
f00c9e44 4951 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4952}
4953
7c319d32
AK		 4954static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4955 unsigned int flags)
4956{
4957 int err;
4958 struct inode *qf_inode;
a2d4a646 4959 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 4960 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4961 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4962 };
4963
4964 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4965
4966 if (!qf_inums[type])
4967 return -EPERM;
4968
4969 qf_inode = ext4_iget(sb, qf_inums[type]);
4970 if (IS_ERR(qf_inode)) {
4971 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4972 return PTR_ERR(qf_inode);
4973 }
4974
bcb13850
JK		 4975 /* Don't account quota for quota files to avoid recursion */
4976 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 4977 err = dquot_enable(qf_inode, type, format_id, flags);
4978 iput(qf_inode);
4979
4980 return err;
4981}
4982
4983/* Enable usage tracking for all quota types. */
4984static int ext4_enable_quotas(struct super_block *sb)
4985{
4986 int type, err = 0;
a2d4a646 4987 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 4988 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4989 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4990 };
4991
4992 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 4993 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 4994 if (qf_inums[type]) {
4995 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
4996 DQUOT_USAGE_ENABLED);
4997 if (err) {
4998 ext4_warning(sb,
72ba7450
TT		 4999 "Failed to enable quota tracking "
5000 "(type=%d, err=%d). Please run "
5001 "e2fsck to fix.", type, err);
7c319d32
AK		 5002 return err;
5003 }
5004 }
5005 }
5006 return 0;
5007}
5008
ca0e05e4
DM		 5009static int ext4_quota_off(struct super_block *sb, int type)
5010{
21f97697
JK		 5011 struct inode *inode = sb_dqopt(sb)->files[type];
5012 handle_t *handle;
5013
87009d86
DM		 5014 /* Force all delayed allocation blocks to be allocated.
5015 * Caller already holds s_umount sem */
5016 if (test_opt(sb, DELALLOC))
ca0e05e4 5017 sync_filesystem(sb);
ca0e05e4 5018
0b268590
AG		 5019 if (!inode)
5020 goto out;
5021
21f97697
JK		 5022 /* Update modification times of quota files when userspace can
5023 * start looking at them */
9924a92a 5024 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5025 if (IS_ERR(handle))
5026 goto out;
5027 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5028 ext4_mark_inode_dirty(handle, inode);
5029 ext4_journal_stop(handle);
5030
5031out:
ca0e05e4
DM		 5032 return dquot_quota_off(sb, type);
5033}
5034
ac27a0ec
DK		 5035/* Read data from quotafile - avoid pagecache and such because we cannot afford
5036 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5037 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5038 * we don't have to be afraid of races */
617ba13b 5039static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5040 size_t len, loff_t off)
5041{
5042 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5043 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5044 int offset = off & (sb->s_blocksize - 1);
5045 int tocopy;
5046 size_t toread;
5047 struct buffer_head *bh;
5048 loff_t i_size = i_size_read(inode);
5049
5050 if (off > i_size)
5051 return 0;
5052 if (off+len > i_size)
5053 len = i_size-off;
5054 toread = len;
5055 while (toread > 0) {
5056 tocopy = sb->s_blocksize - offset < toread ?
5057 sb->s_blocksize - offset : toread;
1c215028
TT		 5058 bh = ext4_bread(NULL, inode, blk, 0);
5059 if (IS_ERR(bh))
5060 return PTR_ERR(bh);
ac27a0ec
DK		 5061 if (!bh) /* A hole? */
5062 memset(data, 0, tocopy);
5063 else
5064 memcpy(data, bh->b_data+offset, tocopy);
5065 brelse(bh);
5066 offset = 0;
5067 toread -= tocopy;
5068 data += tocopy;
5069 blk++;
5070 }
5071 return len;
5072}
5073
5074/* Write to quotafile (we know the transaction is already started and has
5075 * enough credits) */
617ba13b 5076static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5077 const char *data, size_t len, loff_t off)
5078{
5079 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5080 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5081 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5082 int retries = 0;
ac27a0ec
DK		 5083 struct buffer_head *bh;
5084 handle_t *handle = journal_current_handle();
5085
0390131b 5086 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5087 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5088 " cancelled because transaction is not started",
9c3013e9
JK		 5089 (unsigned long long)off, (unsigned long long)len);
5090 return -EIO;
5091 }
67eeb568
DM		 5092 /*
5093 * Since we account only one data block in transaction credits,
5094 * then it is impossible to cross a block boundary.
5095 */
5096 if (sb->s_blocksize - offset < len) {
5097 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5098 " cancelled because not block aligned",
5099 (unsigned long long)off, (unsigned long long)len);
5100 return -EIO;
5101 }
5102
c5e298ae
TT		 5103 do {
5104 bh = ext4_bread(handle, inode, blk,
5105 EXT4_GET_BLOCKS_CREATE |
5106 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5107 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5108 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5109 if (IS_ERR(bh))
5110 return PTR_ERR(bh);
67eeb568
DM		 5111 if (!bh)
5112 goto out;
5d601255 5113 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5114 err = ext4_journal_get_write_access(handle, bh);
5115 if (err) {
5116 brelse(bh);
1c215028 5117 return err;
ac27a0ec 5118 }
67eeb568
DM		 5119 lock_buffer(bh);
5120 memcpy(bh->b_data+offset, data, len);
5121 flush_dcache_page(bh->b_page);
5122 unlock_buffer(bh);
62d2b5f2 5123 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5124 brelse(bh);
ac27a0ec 5125out:
67eeb568
DM		 5126 if (inode->i_size < off + len) {
5127 i_size_write(inode, off + len);
617ba13b 5128 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5129 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5130 }
67eeb568 5131 return len;
ac27a0ec
DK		 5132}
5133
5134#endif
5135
152a0836
AV		 5136static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5137 const char *dev_name, void *data)
ac27a0ec 5138{
152a0836 5139 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5140}
5141
c290ea01 5142#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5143static inline void register_as_ext2(void)
5144{
5145 int err = register_filesystem(&ext2_fs_type);
5146 if (err)
5147 printk(KERN_WARNING
5148 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5149}
5150
5151static inline void unregister_as_ext2(void)
5152{
5153 unregister_filesystem(&ext2_fs_type);
5154}
2035e776
TT		 5155
5156static inline int ext2_feature_set_ok(struct super_block *sb)
5157{
5158 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5159 return 0;
5160 if (sb->s_flags & MS_RDONLY)
5161 return 1;
5162 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5163 return 0;
5164 return 1;
5165}
24b58424
TT		 5166#else
5167static inline void register_as_ext2(void) { }
5168static inline void unregister_as_ext2(void) { }
2035e776 5169static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5170#endif
5171
24b58424
TT		 5172static inline void register_as_ext3(void)
5173{
5174 int err = register_filesystem(&ext3_fs_type);
5175 if (err)
5176 printk(KERN_WARNING
5177 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5178}
5179
5180static inline void unregister_as_ext3(void)
5181{
5182 unregister_filesystem(&ext3_fs_type);
5183}
2035e776
TT		 5184
5185static inline int ext3_feature_set_ok(struct super_block *sb)
5186{
5187 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5188 return 0;
5189 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5190 return 0;
5191 if (sb->s_flags & MS_RDONLY)
5192 return 1;
5193 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5194 return 0;
5195 return 1;
5196}
24b58424 5197
03010a33
TT		 5198static struct file_system_type ext4_fs_type = {
5199 .owner = THIS_MODULE,
5200 .name = "ext4",
152a0836 5201 .mount = ext4_mount,
03010a33
TT		 5202 .kill_sb = kill_block_super,
5203 .fs_flags = FS_REQUIRES_DEV,
5204};
7f78e035 5205MODULE_ALIAS_FS("ext4");
03010a33 5206
e9e3bcec
ES		 5207/* Shared across all ext4 file systems */
5208wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5209struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5210
5dabfc78 5211static int __init ext4_init_fs(void)
ac27a0ec 5212{
e9e3bcec 5213 int i, err;
c9de560d 5214
e294a537 5215 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5216 ext4_li_info = NULL;
5217 mutex_init(&ext4_li_mtx);
5218
9a4c8019 5219 /* Build-time check for flags consistency */
12e9b892 5220 ext4_check_flag_values();
e9e3bcec
ES		 5221
5222 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5223 mutex_init(&ext4__aio_mutex[i]);
5224 init_waitqueue_head(&ext4__ioend_wq[i]);
5225 }
5226
51865fda 5227 err = ext4_init_es();
6fd058f7
TT		 5228 if (err)
5229 return err;
51865fda
ZL		 5230
5231 err = ext4_init_pageio();
5232 if (err)
b5799018 5233 goto out5;
51865fda 5234
5dabfc78 5235 err = ext4_init_system_zone();
bd2d0210 5236 if (err)
b5799018 5237 goto out4;
857ac889 5238
b5799018 5239 err = ext4_init_sysfs();
dd68314c 5240 if (err)
b5799018 5241 goto out3;
857ac889 5242
5dabfc78 5243 err = ext4_init_mballoc();
c9de560d
AT		 5244 if (err)
5245 goto out2;
9c191f70
M		 5246 else
5247 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5248 err = init_inodecache();
5249 if (err)
5250 goto out1;
24b58424 5251 register_as_ext3();
2035e776 5252 register_as_ext2();
03010a33 5253 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5254 if (err)
5255 goto out;
bfff6873 5256
ac27a0ec
DK		 5257 return 0;
5258out:
24b58424
TT		 5259 unregister_as_ext2();
5260 unregister_as_ext3();
ac27a0ec
DK		 5261 destroy_inodecache();
5262out1:
9c191f70 5263 ext4_mballoc_ready = 0;
5dabfc78 5264 ext4_exit_mballoc();
9c191f70 5265out2:
b5799018
TT		 5266 ext4_exit_sysfs();
5267out3:
5dabfc78 5268 ext4_exit_system_zone();
b5799018 5269out4:
5dabfc78 5270 ext4_exit_pageio();
b5799018 5271out5:
51865fda
ZL		 5272 ext4_exit_es();
5273
ac27a0ec
DK		 5274 return err;
5275}
5276
5dabfc78 5277static void __exit ext4_exit_fs(void)
ac27a0ec 5278{
e298e73b 5279 ext4_exit_crypto();
bfff6873 5280 ext4_destroy_lazyinit_thread();
24b58424
TT		 5281 unregister_as_ext2();
5282 unregister_as_ext3();
03010a33 5283 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5284 destroy_inodecache();
5dabfc78 5285 ext4_exit_mballoc();
b5799018 5286 ext4_exit_sysfs();
5dabfc78
TT		 5287 ext4_exit_system_zone();
5288 ext4_exit_pageio();
dd12ed14 5289 ext4_exit_es();
ac27a0ec
DK		 5290}
5291
5292MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5293MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5294MODULE_LICENSE("GPL");
5dabfc78
TT		 5295module_init(ext4_init_fs)
5296module_exit(ext4_exit_fs)
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