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ext4: don't call ext4_error while block group is locked
[mirror_ubuntu-bionic-kernel.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>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
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>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 72static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 73 char nbuf[16]);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
109#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110#else
111#define IS_EXT3_SB(sb) (0)
112#endif
bd81d8ee 113
d25425f8
DW		 114static int ext4_verify_csum_type(struct super_block *sb,
115 struct ext4_super_block *es)
116{
117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
119 return 1;
120
121 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
122}
123
a9c47317
DW		 124static __le32 ext4_superblock_csum(struct super_block *sb,
125 struct ext4_super_block *es)
126{
127 struct ext4_sb_info *sbi = EXT4_SB(sb);
128 int offset = offsetof(struct ext4_super_block, s_checksum);
129 __u32 csum;
130
131 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
132
133 return cpu_to_le32(csum);
134}
135
136int ext4_superblock_csum_verify(struct super_block *sb,
137 struct ext4_super_block *es)
138{
139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
141 return 1;
142
143 return es->s_checksum == ext4_superblock_csum(sb, es);
144}
145
146void ext4_superblock_csum_set(struct super_block *sb,
147 struct ext4_super_block *es)
148{
149 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
150 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
151 return;
152
153 es->s_checksum = ext4_superblock_csum(sb, es);
154}
155
9933fc0a
TT		 156void *ext4_kvmalloc(size_t size, gfp_t flags)
157{
158 void *ret;
159
160 ret = kmalloc(size, flags);
161 if (!ret)
162 ret = __vmalloc(size, flags, PAGE_KERNEL);
163 return ret;
164}
165
166void *ext4_kvzalloc(size_t size, gfp_t flags)
167{
168 void *ret;
169
db9481c0 170 ret = kzalloc(size, flags);
9933fc0a
TT		 171 if (!ret)
172 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
173 return ret;
174}
175
176void ext4_kvfree(void *ptr)
177{
178 if (is_vmalloc_addr(ptr))
179 vfree(ptr);
180 else
181 kfree(ptr);
182
183}
184
8fadc143
AR		 185ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
186 struct ext4_group_desc *bg)
bd81d8ee 187{
3a14589c 188 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 189 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 190 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 191}
192
8fadc143
AR		 193ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
194 struct ext4_group_desc *bg)
bd81d8ee 195{
5272f837 196 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 197 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 198 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 199}
200
8fadc143
AR		 201ext4_fsblk_t ext4_inode_table(struct super_block *sb,
202 struct ext4_group_desc *bg)
bd81d8ee 203{
5272f837 204 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 206 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 207}
208
021b65bb
TT		 209__u32 ext4_free_group_clusters(struct super_block *sb,
210 struct ext4_group_desc *bg)
560671a0
AK		 211{
212 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 214 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 215}
216
217__u32 ext4_free_inodes_count(struct super_block *sb,
218 struct ext4_group_desc *bg)
219{
220 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 222 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 223}
224
225__u32 ext4_used_dirs_count(struct super_block *sb,
226 struct ext4_group_desc *bg)
227{
228 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 230 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 231}
232
233__u32 ext4_itable_unused_count(struct super_block *sb,
234 struct ext4_group_desc *bg)
235{
236 return le16_to_cpu(bg->bg_itable_unused_lo) |
237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 238 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 239}
240
8fadc143
AR		 241void ext4_block_bitmap_set(struct super_block *sb,
242 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 243{
3a14589c 244 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 245 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
246 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 247}
248
8fadc143
AR		 249void ext4_inode_bitmap_set(struct super_block *sb,
250 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 251{
5272f837 252 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 253 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
254 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 255}
256
8fadc143
AR		 257void ext4_inode_table_set(struct super_block *sb,
258 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 259{
5272f837 260 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
262 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 263}
264
021b65bb
TT		 265void ext4_free_group_clusters_set(struct super_block *sb,
266 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 267{
268 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
270 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
271}
272
273void ext4_free_inodes_set(struct super_block *sb,
274 struct ext4_group_desc *bg, __u32 count)
275{
276 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
278 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
279}
280
281void ext4_used_dirs_set(struct super_block *sb,
282 struct ext4_group_desc *bg, __u32 count)
283{
284 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
286 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
287}
288
289void ext4_itable_unused_set(struct super_block *sb,
290 struct ext4_group_desc *bg, __u32 count)
291{
292 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
294 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
295}
296
d3d1faf6
CW		 297
298/* Just increment the non-pointer handle value */
299static handle_t *ext4_get_nojournal(void)
300{
301 handle_t *handle = current->journal_info;
302 unsigned long ref_cnt = (unsigned long)handle;
303
304 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
305
306 ref_cnt++;
307 handle = (handle_t *)ref_cnt;
308
309 current->journal_info = handle;
310 return handle;
311}
312
313
314/* Decrement the non-pointer handle value */
315static void ext4_put_nojournal(handle_t *handle)
316{
317 unsigned long ref_cnt = (unsigned long)handle;
318
319 BUG_ON(ref_cnt == 0);
320
321 ref_cnt--;
322 handle = (handle_t *)ref_cnt;
323
324 current->journal_info = handle;
325}
326
ac27a0ec 327/*
dab291af 328 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 329 *
330 * The only special thing we need to do here is to make sure that all
331 * journal_end calls result in the superblock being marked dirty, so
332 * that sync() will call the filesystem's write_super callback if
333 * appropriate.
334 */
617ba13b 335handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 336{
337 journal_t *journal;
338
12706394 339 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 340 if (sb->s_flags & MS_RDONLY)
341 return ERR_PTR(-EROFS);
342
8e8ad8a5 343 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
617ba13b 344 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 345 if (!journal)
346 return ext4_get_nojournal();
347 /*
348 * Special case here: if the journal has aborted behind our
349 * backs (eg. EIO in the commit thread), then we still need to
350 * take the FS itself readonly cleanly.
351 */
352 if (is_journal_aborted(journal)) {
353 ext4_abort(sb, "Detected aborted journal");
354 return ERR_PTR(-EROFS);
ac27a0ec 355 }
be4f27d3 356 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 357}
358
359/*
360 * The only special thing we need to do here is to make sure that all
dab291af 361 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 362 * that sync() will call the filesystem's write_super callback if
363 * appropriate.
364 */
c398eda0 365int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 366{
367 struct super_block *sb;
368 int err;
369 int rc;
370
0390131b 371 if (!ext4_handle_valid(handle)) {
d3d1faf6 372 ext4_put_nojournal(handle);
0390131b
FM		 373 return 0;
374 }
ac27a0ec
DK		 375 sb = handle->h_transaction->t_journal->j_private;
376 err = handle->h_err;
dab291af 377 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 378
379 if (!err)
380 err = rc;
381 if (err)
c398eda0 382 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 383 return err;
384}
385
90c7201b
TT		 386void ext4_journal_abort_handle(const char *caller, unsigned int line,
387 const char *err_fn, struct buffer_head *bh,
388 handle_t *handle, int err)
ac27a0ec
DK		 389{
390 char nbuf[16];
617ba13b 391 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 392
0390131b
FM		 393 BUG_ON(!ext4_handle_valid(handle));
394
ac27a0ec
DK		 395 if (bh)
396 BUFFER_TRACE(bh, "abort");
397
398 if (!handle->h_err)
399 handle->h_err = err;
400
401 if (is_handle_aborted(handle))
402 return;
403
92b97816 404 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
90c7201b 405 caller, line, errstr, err_fn);
ac27a0ec 406
dab291af 407 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 408}
409
1c13d5c0
TT		 410static void __save_error_info(struct super_block *sb, const char *func,
411 unsigned int line)
412{
413 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
414
415 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
416 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
417 es->s_last_error_time = cpu_to_le32(get_seconds());
418 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
419 es->s_last_error_line = cpu_to_le32(line);
420 if (!es->s_first_error_time) {
421 es->s_first_error_time = es->s_last_error_time;
422 strncpy(es->s_first_error_func, func,
423 sizeof(es->s_first_error_func));
424 es->s_first_error_line = cpu_to_le32(line);
425 es->s_first_error_ino = es->s_last_error_ino;
426 es->s_first_error_block = es->s_last_error_block;
427 }
66e61a9e
TT		 428 /*
429 * Start the daily error reporting function if it hasn't been
430 * started already
431 */
432 if (!es->s_error_count)
433 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 434 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
435}
436
437static void save_error_info(struct super_block *sb, const char *func,
438 unsigned int line)
439{
440 __save_error_info(sb, func, line);
441 ext4_commit_super(sb, 1);
442}
443
7c2e7087
TT		 444/*
445 * The del_gendisk() function uninitializes the disk-specific data
446 * structures, including the bdi structure, without telling anyone
447 * else. Once this happens, any attempt to call mark_buffer_dirty()
448 * (for example, by ext4_commit_super), will cause a kernel OOPS.
449 * This is a kludge to prevent these oops until we can put in a proper
450 * hook in del_gendisk() to inform the VFS and file system layers.
451 */
452static int block_device_ejected(struct super_block *sb)
453{
454 struct inode *bd_inode = sb->s_bdev->bd_inode;
455 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
456
457 return bdi->dev == NULL;
458}
459
18aadd47
BJ		 460static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
461{
462 struct super_block *sb = journal->j_private;
463 struct ext4_sb_info *sbi = EXT4_SB(sb);
464 int error = is_journal_aborted(journal);
465 struct ext4_journal_cb_entry *jce, *tmp;
466
467 spin_lock(&sbi->s_md_lock);
468 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
469 list_del_init(&jce->jce_list);
470 spin_unlock(&sbi->s_md_lock);
471 jce->jce_func(sb, jce, error);
472 spin_lock(&sbi->s_md_lock);
473 }
474 spin_unlock(&sbi->s_md_lock);
475}
1c13d5c0 476
ac27a0ec
DK		 477/* Deal with the reporting of failure conditions on a filesystem such as
478 * inconsistencies detected or read IO failures.
479 *
480 * On ext2, we can store the error state of the filesystem in the
617ba13b 481 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 482 * write ordering constraints on the superblock which prevent us from
483 * writing it out straight away; and given that the journal is about to
484 * be aborted, we can't rely on the current, or future, transactions to
485 * write out the superblock safely.
486 *
dab291af 487 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 488 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 489 * that error until we've noted it down and cleared it.
490 */
491
617ba13b 492static void ext4_handle_error(struct super_block *sb)
ac27a0ec 493{
ac27a0ec
DK		 494 if (sb->s_flags & MS_RDONLY)
495 return;
496
2b2d6d01 497 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 498 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 499
4ab2f15b 500 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 501 if (journal)
dab291af 502 jbd2_journal_abort(journal, -EIO);
ac27a0ec 503 }
2b2d6d01 504 if (test_opt(sb, ERRORS_RO)) {
b31e1552 505 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 506 sb->s_flags |= MS_RDONLY;
507 }
ac27a0ec 508 if (test_opt(sb, ERRORS_PANIC))
617ba13b 509 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 510 sb->s_id);
511}
512
12062ddd 513void __ext4_error(struct super_block *sb, const char *function,
c398eda0 514 unsigned int line, const char *fmt, ...)
ac27a0ec 515{
0ff2ea7d 516 struct va_format vaf;
ac27a0ec
DK		 517 va_list args;
518
519 va_start(args, fmt);
0ff2ea7d
JP		 520 vaf.fmt = fmt;
521 vaf.va = &args;
522 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
523 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 524 va_end(args);
f3fc0210 525 save_error_info(sb, function, line);
ac27a0ec 526
617ba13b 527 ext4_handle_error(sb);
ac27a0ec
DK		 528}
529
c398eda0
TT		 530void ext4_error_inode(struct inode *inode, const char *function,
531 unsigned int line, ext4_fsblk_t block,
273df556
FM		 532 const char *fmt, ...)
533{
534 va_list args;
f7c21177 535 struct va_format vaf;
1c13d5c0 536 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 537
1c13d5c0
TT		 538 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
539 es->s_last_error_block = cpu_to_le64(block);
540 save_error_info(inode->i_sb, function, line);
273df556 541 va_start(args, fmt);
f7c21177
TT		 542 vaf.fmt = fmt;
543 vaf.va = &args;
c398eda0 544 if (block)
d9ee81da
JP		 545 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
546 "inode #%lu: block %llu: comm %s: %pV\n",
547 inode->i_sb->s_id, function, line, inode->i_ino,
548 block, current->comm, &vaf);
549 else
550 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
551 "inode #%lu: comm %s: %pV\n",
552 inode->i_sb->s_id, function, line, inode->i_ino,
553 current->comm, &vaf);
273df556
FM		 554 va_end(args);
555
556 ext4_handle_error(inode->i_sb);
557}
558
c398eda0 559void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 560 unsigned int line, ext4_fsblk_t block,
561 const char *fmt, ...)
273df556
FM		 562{
563 va_list args;
f7c21177 564 struct va_format vaf;
1c13d5c0 565 struct ext4_super_block *es;
273df556
FM		 566 struct inode *inode = file->f_dentry->d_inode;
567 char pathname[80], *path;
568
1c13d5c0
TT		 569 es = EXT4_SB(inode->i_sb)->s_es;
570 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
571 save_error_info(inode->i_sb, function, line);
273df556 572 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 573 if (IS_ERR(path))
273df556 574 path = "(unknown)";
f7c21177
TT		 575 va_start(args, fmt);
576 vaf.fmt = fmt;
577 vaf.va = &args;
d9ee81da
JP		 578 if (block)
579 printk(KERN_CRIT
580 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
581 "block %llu: comm %s: path %s: %pV\n",
582 inode->i_sb->s_id, function, line, inode->i_ino,
583 block, current->comm, path, &vaf);
584 else
585 printk(KERN_CRIT
586 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
587 "comm %s: path %s: %pV\n",
588 inode->i_sb->s_id, function, line, inode->i_ino,
589 current->comm, path, &vaf);
273df556
FM		 590 va_end(args);
591
592 ext4_handle_error(inode->i_sb);
593}
594
2b2d6d01 595static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 596 char nbuf[16])
597{
598 char *errstr = NULL;
599
600 switch (errno) {
601 case -EIO:
602 errstr = "IO failure";
603 break;
604 case -ENOMEM:
605 errstr = "Out of memory";
606 break;
607 case -EROFS:
78f1ddbb
TT		 608 if (!sb || (EXT4_SB(sb)->s_journal &&
609 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 610 errstr = "Journal has aborted";
611 else
612 errstr = "Readonly filesystem";
613 break;
614 default:
615 /* If the caller passed in an extra buffer for unknown
616 * errors, textualise them now. Else we just return
617 * NULL. */
618 if (nbuf) {
619 /* Check for truncated error codes... */
620 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
621 errstr = nbuf;
622 }
623 break;
624 }
625
626 return errstr;
627}
628
617ba13b 629/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 630 * automatically and invokes the appropriate error response. */
631
c398eda0
TT		 632void __ext4_std_error(struct super_block *sb, const char *function,
633 unsigned int line, int errno)
ac27a0ec
DK		 634{
635 char nbuf[16];
636 const char *errstr;
637
638 /* Special case: if the error is EROFS, and we're not already
639 * inside a transaction, then there's really no point in logging
640 * an error. */
641 if (errno == -EROFS && journal_current_handle() == NULL &&
642 (sb->s_flags & MS_RDONLY))
643 return;
644
617ba13b 645 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 646 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
647 sb->s_id, function, line, errstr);
1c13d5c0 648 save_error_info(sb, function, line);
ac27a0ec 649
617ba13b 650 ext4_handle_error(sb);
ac27a0ec
DK		 651}
652
653/*
617ba13b 654 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 655 * abort function may be used to deal with unrecoverable failures such
656 * as journal IO errors or ENOMEM at a critical moment in log management.
657 *
658 * We unconditionally force the filesystem into an ABORT|READONLY state,
659 * unless the error response on the fs has been set to panic in which
660 * case we take the easy way out and panic immediately.
661 */
662
c67d859e 663void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 664 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 665{
666 va_list args;
667
1c13d5c0 668 save_error_info(sb, function, line);
ac27a0ec 669 va_start(args, fmt);
c398eda0
TT		 670 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
671 function, line);
ac27a0ec
DK		 672 vprintk(fmt, args);
673 printk("\n");
674 va_end(args);
675
1c13d5c0
TT		 676 if ((sb->s_flags & MS_RDONLY) == 0) {
677 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
678 sb->s_flags |= MS_RDONLY;
679 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
680 if (EXT4_SB(sb)->s_journal)
681 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
682 save_error_info(sb, function, line);
683 }
ac27a0ec 684 if (test_opt(sb, ERRORS_PANIC))
617ba13b 685 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 686}
687
0ff2ea7d 688void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 689{
0ff2ea7d 690 struct va_format vaf;
b31e1552
ES		 691 va_list args;
692
693 va_start(args, fmt);
0ff2ea7d
JP		 694 vaf.fmt = fmt;
695 vaf.va = &args;
696 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 697 va_end(args);
698}
699
12062ddd 700void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 701 unsigned int line, const char *fmt, ...)
ac27a0ec 702{
0ff2ea7d 703 struct va_format vaf;
ac27a0ec
DK		 704 va_list args;
705
706 va_start(args, fmt);
0ff2ea7d
JP		 707 vaf.fmt = fmt;
708 vaf.va = &args;
709 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
710 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 711 va_end(args);
712}
713
e29136f8
TT		 714void __ext4_grp_locked_error(const char *function, unsigned int line,
715 struct super_block *sb, ext4_group_t grp,
716 unsigned long ino, ext4_fsblk_t block,
717 const char *fmt, ...)
5d1b1b3f
AK		 718__releases(bitlock)
719__acquires(bitlock)
720{
0ff2ea7d 721 struct va_format vaf;
5d1b1b3f
AK		 722 va_list args;
723 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
724
1c13d5c0
TT		 725 es->s_last_error_ino = cpu_to_le32(ino);
726 es->s_last_error_block = cpu_to_le64(block);
727 __save_error_info(sb, function, line);
0ff2ea7d 728
5d1b1b3f 729 va_start(args, fmt);
0ff2ea7d
JP		 730
731 vaf.fmt = fmt;
732 vaf.va = &args;
21149d61 733 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 734 sb->s_id, function, line, grp);
735 if (ino)
0ff2ea7d 736 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 737 if (block)
0ff2ea7d
JP		 738 printk(KERN_CONT "block %llu:", (unsigned long long) block);
739 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 740 va_end(args);
741
742 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 743 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 744 return;
745 }
1c13d5c0 746
5d1b1b3f
AK		 747 ext4_unlock_group(sb, grp);
748 ext4_handle_error(sb);
749 /*
750 * We only get here in the ERRORS_RO case; relocking the group
751 * may be dangerous, but nothing bad will happen since the
752 * filesystem will have already been marked read/only and the
753 * journal has been aborted. We return 1 as a hint to callers
754 * who might what to use the return value from
25985edc 755 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 756 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
757 * aggressively from the ext4 function in question, with a
758 * more appropriate error code.
759 */
760 ext4_lock_group(sb, grp);
761 return;
762}
763
617ba13b 764void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 765{
617ba13b 766 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 767
617ba13b 768 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 769 return;
770
12062ddd 771 ext4_warning(sb,
ac27a0ec
DK		 772 "updating to rev %d because of new feature flag, "
773 "running e2fsck is recommended",
617ba13b 774 EXT4_DYNAMIC_REV);
ac27a0ec 775
617ba13b
MC		 776 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
777 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
778 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 779 /* leave es->s_feature_*compat flags alone */
780 /* es->s_uuid will be set by e2fsck if empty */
781
782 /*
783 * The rest of the superblock fields should be zero, and if not it
784 * means they are likely already in use, so leave them alone. We
785 * can leave it up to e2fsck to clean up any inconsistencies there.
786 */
787}
788
789/*
790 * Open the external journal device
791 */
b31e1552 792static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 793{
794 struct block_device *bdev;
795 char b[BDEVNAME_SIZE];
796
d4d77629 797 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 798 if (IS_ERR(bdev))
799 goto fail;
800 return bdev;
801
802fail:
b31e1552 803 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 804 __bdevname(dev, b), PTR_ERR(bdev));
805 return NULL;
806}
807
808/*
809 * Release the journal device
810 */
617ba13b 811static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 812{
e525fd89 813 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 814}
815
617ba13b 816static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 817{
818 struct block_device *bdev;
819 int ret = -ENODEV;
820
821 bdev = sbi->journal_bdev;
822 if (bdev) {
617ba13b 823 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 824 sbi->journal_bdev = NULL;
825 }
826 return ret;
827}
828
829static inline struct inode *orphan_list_entry(struct list_head *l)
830{
617ba13b 831 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 832}
833
617ba13b 834static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 835{
836 struct list_head *l;
837
b31e1552
ES		 838 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
839 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 840
841 printk(KERN_ERR "sb_info orphan list:\n");
842 list_for_each(l, &sbi->s_orphan) {
843 struct inode *inode = orphan_list_entry(l);
844 printk(KERN_ERR " "
845 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
846 inode->i_sb->s_id, inode->i_ino, inode,
847 inode->i_mode, inode->i_nlink,
848 NEXT_ORPHAN(inode));
849 }
850}
851
2b2d6d01 852static void ext4_put_super(struct super_block *sb)
ac27a0ec 853{
617ba13b
MC		 854 struct ext4_sb_info *sbi = EXT4_SB(sb);
855 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 856 int i, err;
ac27a0ec 857
857ac889 858 ext4_unregister_li_request(sb);
e0ccfd95
CH		 859 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
860
4c0425ff
MC		 861 flush_workqueue(sbi->dio_unwritten_wq);
862 destroy_workqueue(sbi->dio_unwritten_wq);
863
a9e220f8 864 lock_super(sb);
0390131b
FM		 865 if (sbi->s_journal) {
866 err = jbd2_journal_destroy(sbi->s_journal);
867 sbi->s_journal = NULL;
868 if (err < 0)
c67d859e 869 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 870 }
d4edac31 871
a1c6c569 872 del_timer(&sbi->s_err_report);
d4edac31
JB		 873 ext4_release_system_zone(sb);
874 ext4_mb_release(sb);
875 ext4_ext_release(sb);
876 ext4_xattr_put_super(sb);
877
ac27a0ec 878 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 879 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 880 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 881 }
58c5873a 882 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 883 ext4_commit_super(sb, 1);
884
240799cd 885 if (sbi->s_proc) {
66acdcf4 886 remove_proc_entry("options", sbi->s_proc);
9f6200bb 887 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 888 }
3197ebdb 889 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 890
891 for (i = 0; i < sbi->s_gdb_count; i++)
892 brelse(sbi->s_group_desc[i]);
f18a5f21 893 ext4_kvfree(sbi->s_group_desc);
9933fc0a 894 ext4_kvfree(sbi->s_flex_groups);
57042651 895 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 896 percpu_counter_destroy(&sbi->s_freeinodes_counter);
897 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 898 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 899 brelse(sbi->s_sbh);
900#ifdef CONFIG_QUOTA
901 for (i = 0; i < MAXQUOTAS; i++)
902 kfree(sbi->s_qf_names[i]);
903#endif
904
905 /* Debugging code just in case the in-memory inode orphan list
906 * isn't empty. The on-disk one can be non-empty if we've
907 * detected an error and taken the fs readonly, but the
908 * in-memory list had better be clean by this point. */
909 if (!list_empty(&sbi->s_orphan))
910 dump_orphan_list(sb, sbi);
911 J_ASSERT(list_empty(&sbi->s_orphan));
912
f98393a6 913 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 914 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
915 /*
916 * Invalidate the journal device's buffers. We don't want them
917 * floating about in memory - the physical journal device may
918 * hotswapped, and it breaks the `ro-after' testing code.
919 */
920 sync_blockdev(sbi->journal_bdev);
f98393a6 921 invalidate_bdev(sbi->journal_bdev);
617ba13b 922 ext4_blkdev_remove(sbi);
ac27a0ec 923 }
c5e06d10
JL		 924 if (sbi->s_mmp_tsk)
925 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 926 sb->s_fs_info = NULL;
3197ebdb
TT		 927 /*
928 * Now that we are completely done shutting down the
929 * superblock, we need to actually destroy the kobject.
930 */
3197ebdb
TT		 931 unlock_super(sb);
932 kobject_put(&sbi->s_kobj);
933 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 934 if (sbi->s_chksum_driver)
935 crypto_free_shash(sbi->s_chksum_driver);
705895b6 936 kfree(sbi->s_blockgroup_lock);
ac27a0ec 937 kfree(sbi);
ac27a0ec
DK		 938}
939
e18b890b 940static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 941
942/*
943 * Called inside transaction, so use GFP_NOFS
944 */
617ba13b 945static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 946{
617ba13b 947 struct ext4_inode_info *ei;
ac27a0ec 948
e6b4f8da 949 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 950 if (!ei)
951 return NULL;
0b8e58a1 952
ac27a0ec 953 ei->vfs_inode.i_version = 1;
91246c00 954 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 955 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 956 INIT_LIST_HEAD(&ei->i_prealloc_list);
957 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 958 ei->i_reserved_data_blocks = 0;
959 ei->i_reserved_meta_blocks = 0;
960 ei->i_allocated_meta_blocks = 0;
9d0be502 961 ei->i_da_metadata_calc_len = 0;
7e731bc9 962 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 963 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 964#ifdef CONFIG_QUOTA
965 ei->i_reserved_quota = 0;
966#endif
8aefcd55 967 ei->jinode = NULL;
c7064ef1 968 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 969 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 970 ei->cur_aio_dio = NULL;
b436b9be
JK		 971 ei->i_sync_tid = 0;
972 ei->i_datasync_tid = 0;
f7ad6d2e 973 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 974 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 975
ac27a0ec
DK		 976 return &ei->vfs_inode;
977}
978
7ff9c073
TT		 979static int ext4_drop_inode(struct inode *inode)
980{
981 int drop = generic_drop_inode(inode);
982
983 trace_ext4_drop_inode(inode, drop);
984 return drop;
985}
986
fa0d7e3d
NP		 987static void ext4_i_callback(struct rcu_head *head)
988{
989 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 990 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
991}
992
617ba13b 993static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 994{
9f7dd93d 995 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 996 ext4_msg(inode->i_sb, KERN_ERR,
997 "Inode %lu (%p): orphan list check failed!",
998 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 999 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1000 EXT4_I(inode), sizeof(struct ext4_inode_info),
1001 true);
1002 dump_stack();
1003 }
fa0d7e3d 1004 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1005}
1006
51cc5068 1007static void init_once(void *foo)
ac27a0ec 1008{
617ba13b 1009 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1010
a35afb83 1011 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 1012#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 1013 init_rwsem(&ei->xattr_sem);
ac27a0ec 1014#endif
0e855ac8 1015 init_rwsem(&ei->i_data_sem);
a35afb83 1016 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1017}
1018
1019static int init_inodecache(void)
1020{
617ba13b
MC		 1021 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1022 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 1023 0, (SLAB_RECLAIM_ACCOUNT|
1024 SLAB_MEM_SPREAD),
20c2df83 1025 init_once);
617ba13b 1026 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1027 return -ENOMEM;
1028 return 0;
1029}
1030
1031static void destroy_inodecache(void)
1032{
617ba13b 1033 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1034}
1035
0930fcc1 1036void ext4_clear_inode(struct inode *inode)
ac27a0ec 1037{
0930fcc1 1038 invalidate_inode_buffers(inode);
dbd5768f 1039 clear_inode(inode);
9f754758 1040 dquot_drop(inode);
c2ea3fde 1041 ext4_discard_preallocations(inode);
8aefcd55
TT		 1042 if (EXT4_I(inode)->jinode) {
1043 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1044 EXT4_I(inode)->jinode);
1045 jbd2_free_inode(EXT4_I(inode)->jinode);
1046 EXT4_I(inode)->jinode = NULL;
1047 }
ac27a0ec
DK		 1048}
1049
1b961ac0 1050static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1051 u64 ino, u32 generation)
ac27a0ec 1052{
ac27a0ec 1053 struct inode *inode;
ac27a0ec 1054
617ba13b 1055 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1056 return ERR_PTR(-ESTALE);
617ba13b 1057 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1058 return ERR_PTR(-ESTALE);
1059
1060 /* iget isn't really right if the inode is currently unallocated!!
1061 *
617ba13b 1062 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1063 * deleted, so we should be safe.
1064 *
1065 * Currently we don't know the generation for parent directory, so
1066 * a generation of 0 means "accept any"
1067 */
1d1fe1ee
DH		 1068 inode = ext4_iget(sb, ino);
1069 if (IS_ERR(inode))
1070 return ERR_CAST(inode);
1071 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1072 iput(inode);
1073 return ERR_PTR(-ESTALE);
1074 }
1b961ac0
CH		 1075
1076 return inode;
1077}
1078
1079static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1080 int fh_len, int fh_type)
1b961ac0
CH		 1081{
1082 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1083 ext4_nfs_get_inode);
1084}
1085
1086static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1087 int fh_len, int fh_type)
1b961ac0
CH		 1088{
1089 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1090 ext4_nfs_get_inode);
ac27a0ec
DK		 1091}
1092
c39a7f84
TO		 1093/*
1094 * Try to release metadata pages (indirect blocks, directories) which are
1095 * mapped via the block device. Since these pages could have journal heads
1096 * which would prevent try_to_free_buffers() from freeing them, we must use
1097 * jbd2 layer's try_to_free_buffers() function to release them.
1098 */
0b8e58a1
AD		 1099static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1100 gfp_t wait)
c39a7f84
TO		 1101{
1102 journal_t *journal = EXT4_SB(sb)->s_journal;
1103
1104 WARN_ON(PageChecked(page));
1105 if (!page_has_buffers(page))
1106 return 0;
1107 if (journal)
1108 return jbd2_journal_try_to_free_buffers(journal, page,
1109 wait & ~__GFP_WAIT);
1110 return try_to_free_buffers(page);
1111}
1112
ac27a0ec 1113#ifdef CONFIG_QUOTA
af5bc92d 1114#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1115#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1116
617ba13b
MC		 1117static int ext4_write_dquot(struct dquot *dquot);
1118static int ext4_acquire_dquot(struct dquot *dquot);
1119static int ext4_release_dquot(struct dquot *dquot);
1120static int ext4_mark_dquot_dirty(struct dquot *dquot);
1121static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1122static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1123 struct path *path);
7c319d32
AK		 1124static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1125 int format_id);
ca0e05e4 1126static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1127static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1128static int ext4_quota_on_mount(struct super_block *sb, int type);
1129static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1130 size_t len, loff_t off);
617ba13b 1131static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1132 const char *data, size_t len, loff_t off);
7c319d32
AK		 1133static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1134 unsigned int flags);
1135static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1136
61e225dc 1137static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1138 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1139 .write_dquot = ext4_write_dquot,
1140 .acquire_dquot = ext4_acquire_dquot,
1141 .release_dquot = ext4_release_dquot,
1142 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1143 .write_info = ext4_write_info,
1144 .alloc_dquot = dquot_alloc,
1145 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1146};
1147
0d54b217 1148static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1149 .quota_on = ext4_quota_on,
ca0e05e4 1150 .quota_off = ext4_quota_off,
287a8095
CH		 1151 .quota_sync = dquot_quota_sync,
1152 .get_info = dquot_get_dqinfo,
1153 .set_info = dquot_set_dqinfo,
1154 .get_dqblk = dquot_get_dqblk,
1155 .set_dqblk = dquot_set_dqblk
ac27a0ec 1156};
7c319d32
AK		 1157
1158static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1159 .quota_on_meta = ext4_quota_on_sysfile,
1160 .quota_off = ext4_quota_off_sysfile,
1161 .quota_sync = dquot_quota_sync,
1162 .get_info = dquot_get_dqinfo,
1163 .set_info = dquot_set_dqinfo,
1164 .get_dqblk = dquot_get_dqblk,
1165 .set_dqblk = dquot_set_dqblk
1166};
ac27a0ec
DK		 1167#endif
1168
ee9b6d61 1169static const struct super_operations ext4_sops = {
617ba13b
MC		 1170 .alloc_inode = ext4_alloc_inode,
1171 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1172 .write_inode = ext4_write_inode,
1173 .dirty_inode = ext4_dirty_inode,
7ff9c073 1174 .drop_inode = ext4_drop_inode,
0930fcc1 1175 .evict_inode = ext4_evict_inode,
617ba13b 1176 .put_super = ext4_put_super,
617ba13b 1177 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1178 .freeze_fs = ext4_freeze,
1179 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1180 .statfs = ext4_statfs,
1181 .remount_fs = ext4_remount,
617ba13b 1182 .show_options = ext4_show_options,
ac27a0ec 1183#ifdef CONFIG_QUOTA
617ba13b
MC		 1184 .quota_read = ext4_quota_read,
1185 .quota_write = ext4_quota_write,
ac27a0ec 1186#endif
c39a7f84 1187 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1188};
1189
9ca92389
TT		 1190static const struct super_operations ext4_nojournal_sops = {
1191 .alloc_inode = ext4_alloc_inode,
1192 .destroy_inode = ext4_destroy_inode,
1193 .write_inode = ext4_write_inode,
1194 .dirty_inode = ext4_dirty_inode,
7ff9c073 1195 .drop_inode = ext4_drop_inode,
0930fcc1 1196 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1197 .put_super = ext4_put_super,
1198 .statfs = ext4_statfs,
1199 .remount_fs = ext4_remount,
9ca92389
TT		 1200 .show_options = ext4_show_options,
1201#ifdef CONFIG_QUOTA
1202 .quota_read = ext4_quota_read,
1203 .quota_write = ext4_quota_write,
1204#endif
1205 .bdev_try_to_free_page = bdev_try_to_free_page,
1206};
1207
39655164 1208static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1209 .fh_to_dentry = ext4_fh_to_dentry,
1210 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1211 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1212};
1213
1214enum {
1215 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1216 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1217 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1218 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1219 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1220 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1221 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1222 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1223 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1224 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1225 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1226 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1227 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1228 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1229 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1230 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1231 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1232 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1233};
1234
a447c093 1235static const match_table_t tokens = {
ac27a0ec
DK		 1236 {Opt_bsd_df, "bsddf"},
1237 {Opt_minix_df, "minixdf"},
1238 {Opt_grpid, "grpid"},
1239 {Opt_grpid, "bsdgroups"},
1240 {Opt_nogrpid, "nogrpid"},
1241 {Opt_nogrpid, "sysvgroups"},
1242 {Opt_resgid, "resgid=%u"},
1243 {Opt_resuid, "resuid=%u"},
1244 {Opt_sb, "sb=%u"},
1245 {Opt_err_cont, "errors=continue"},
1246 {Opt_err_panic, "errors=panic"},
1247 {Opt_err_ro, "errors=remount-ro"},
1248 {Opt_nouid32, "nouid32"},
ac27a0ec 1249 {Opt_debug, "debug"},
72578c33
TT		 1250 {Opt_removed, "oldalloc"},
1251 {Opt_removed, "orlov"},
ac27a0ec
DK		 1252 {Opt_user_xattr, "user_xattr"},
1253 {Opt_nouser_xattr, "nouser_xattr"},
1254 {Opt_acl, "acl"},
1255 {Opt_noacl, "noacl"},
e3bb52ae 1256 {Opt_noload, "norecovery"},
5a916be1 1257 {Opt_noload, "noload"},
72578c33
TT		 1258 {Opt_removed, "nobh"},
1259 {Opt_removed, "bh"},
ac27a0ec 1260 {Opt_commit, "commit=%u"},
30773840
TT		 1261 {Opt_min_batch_time, "min_batch_time=%u"},
1262 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1263 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1264 {Opt_journal_checksum, "journal_checksum"},
1265 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1266 {Opt_abort, "abort"},
1267 {Opt_data_journal, "data=journal"},
1268 {Opt_data_ordered, "data=ordered"},
1269 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1270 {Opt_data_err_abort, "data_err=abort"},
1271 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1272 {Opt_offusrjquota, "usrjquota="},
1273 {Opt_usrjquota, "usrjquota=%s"},
1274 {Opt_offgrpjquota, "grpjquota="},
1275 {Opt_grpjquota, "grpjquota=%s"},
1276 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1277 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1278 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1279 {Opt_grpquota, "grpquota"},
1280 {Opt_noquota, "noquota"},
1281 {Opt_quota, "quota"},
1282 {Opt_usrquota, "usrquota"},
1283 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1284 {Opt_barrier, "barrier"},
1285 {Opt_nobarrier, "nobarrier"},
25ec56b5 1286 {Opt_i_version, "i_version"},
c9de560d 1287 {Opt_stripe, "stripe=%u"},
64769240 1288 {Opt_delalloc, "delalloc"},
dd919b98 1289 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1290 {Opt_mblk_io_submit, "mblk_io_submit"},
1291 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1292 {Opt_block_validity, "block_validity"},
1293 {Opt_noblock_validity, "noblock_validity"},
240799cd 1294 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1295 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1296 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1297 {Opt_auto_da_alloc, "auto_da_alloc"},
1298 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1299 {Opt_dioread_nolock, "dioread_nolock"},
1300 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1301 {Opt_discard, "discard"},
1302 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1303 {Opt_init_itable, "init_itable=%u"},
1304 {Opt_init_itable, "init_itable"},
1305 {Opt_noinit_itable, "noinit_itable"},
c7198b9c
TT		 1306 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1307 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1308 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1309 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1310 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1311 {Opt_err, NULL},
ac27a0ec
DK		 1312};
1313
617ba13b 1314static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1315{
617ba13b 1316 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1317 char *options = (char *) *data;
1318
1319 if (!options || strncmp(options, "sb=", 3) != 0)
1320 return 1; /* Default location */
0b8e58a1 1321
ac27a0ec 1322 options += 3;
0b8e58a1 1323 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1324 sb_block = simple_strtoul(options, &options, 0);
1325 if (*options && *options != ',') {
4776004f 1326 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1327 (char *) *data);
1328 return 1;
1329 }
1330 if (*options == ',')
1331 options++;
1332 *data = (void *) options;
0b8e58a1 1333
ac27a0ec
DK		 1334 return sb_block;
1335}
1336
b3881f74 1337#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1338static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1339 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1340
56c50f11
DM		 1341#ifdef CONFIG_QUOTA
1342static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1343{
1344 struct ext4_sb_info *sbi = EXT4_SB(sb);
1345 char *qname;
1346
1347 if (sb_any_quota_loaded(sb) &&
1348 !sbi->s_qf_names[qtype]) {
1349 ext4_msg(sb, KERN_ERR,
1350 "Cannot change journaled "
1351 "quota options when quota turned on");
57f73c2c 1352 return -1;
56c50f11
DM		 1353 }
1354 qname = match_strdup(args);
1355 if (!qname) {
1356 ext4_msg(sb, KERN_ERR,
1357 "Not enough memory for storing quotafile name");
57f73c2c 1358 return -1;
56c50f11
DM		 1359 }
1360 if (sbi->s_qf_names[qtype] &&
1361 strcmp(sbi->s_qf_names[qtype], qname)) {
1362 ext4_msg(sb, KERN_ERR,
1363 "%s quota file already specified", QTYPE2NAME(qtype));
1364 kfree(qname);
57f73c2c 1365 return -1;
56c50f11
DM		 1366 }
1367 sbi->s_qf_names[qtype] = qname;
1368 if (strchr(sbi->s_qf_names[qtype], '/')) {
1369 ext4_msg(sb, KERN_ERR,
1370 "quotafile must be on filesystem root");
1371 kfree(sbi->s_qf_names[qtype]);
1372 sbi->s_qf_names[qtype] = NULL;
57f73c2c 1373 return -1;
56c50f11 1374 }
fd8c37ec 1375 set_opt(sb, QUOTA);
56c50f11
DM		 1376 return 1;
1377}
1378
1379static int clear_qf_name(struct super_block *sb, int qtype)
1380{
1381
1382 struct ext4_sb_info *sbi = EXT4_SB(sb);
1383
1384 if (sb_any_quota_loaded(sb) &&
1385 sbi->s_qf_names[qtype]) {
1386 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1387 " when quota turned on");
57f73c2c 1388 return -1;
56c50f11
DM		 1389 }
1390 /*
1391 * The space will be released later when all options are confirmed
1392 * to be correct
1393 */
1394 sbi->s_qf_names[qtype] = NULL;
1395 return 1;
1396}
1397#endif
1398
26092bf5
TT		 1399#define MOPT_SET 0x0001
1400#define MOPT_CLEAR 0x0002
1401#define MOPT_NOSUPPORT 0x0004
1402#define MOPT_EXPLICIT 0x0008
1403#define MOPT_CLEAR_ERR 0x0010
1404#define MOPT_GTE0 0x0020
ac27a0ec 1405#ifdef CONFIG_QUOTA
26092bf5
TT		 1406#define MOPT_Q 0
1407#define MOPT_QFMT 0x0040
1408#else
1409#define MOPT_Q MOPT_NOSUPPORT
1410#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1411#endif
26092bf5
TT		 1412#define MOPT_DATAJ 0x0080
1413
1414static const struct mount_opts {
1415 int token;
1416 int mount_opt;
1417 int flags;
1418} ext4_mount_opts[] = {
1419 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1420 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1421 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1422 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1423 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1424 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1425 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1426 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1427 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1428 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1429 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1430 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1431 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1432 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1433 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1434 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1435 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1436 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1437 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1438 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1439 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1440 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1441 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1442 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1443 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1444 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1445 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1446 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1447 {Opt_commit, 0, MOPT_GTE0},
1448 {Opt_max_batch_time, 0, MOPT_GTE0},
1449 {Opt_min_batch_time, 0, MOPT_GTE0},
1450 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1451 {Opt_init_itable, 0, MOPT_GTE0},
1452 {Opt_stripe, 0, MOPT_GTE0},
1453 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1454 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1455 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
03010a33 1456#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1457 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1458 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1459#else
26092bf5
TT		 1460 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1461 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1462#endif
03010a33 1463#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1464 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1465 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1466#else
26092bf5
TT		 1467 {Opt_acl, 0, MOPT_NOSUPPORT},
1468 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1469#endif
26092bf5
TT		 1470 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1471 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1472 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1473 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1474 MOPT_SET | MOPT_Q},
1475 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1476 MOPT_SET | MOPT_Q},
1477 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1478 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1479 {Opt_usrjquota, 0, MOPT_Q},
1480 {Opt_grpjquota, 0, MOPT_Q},
1481 {Opt_offusrjquota, 0, MOPT_Q},
1482 {Opt_offgrpjquota, 0, MOPT_Q},
1483 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1484 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1485 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1486 {Opt_err, 0, 0}
1487};
1488
1489static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1490 substring_t *args, unsigned long *journal_devnum,
1491 unsigned int *journal_ioprio, int is_remount)
1492{
1493 struct ext4_sb_info *sbi = EXT4_SB(sb);
1494 const struct mount_opts *m;
08cefc7a
EB		 1495 kuid_t uid;
1496 kgid_t gid;
26092bf5
TT		 1497 int arg = 0;
1498
57f73c2c
TT		 1499#ifdef CONFIG_QUOTA
1500 if (token == Opt_usrjquota)
1501 return set_qf_name(sb, USRQUOTA, &args[0]);
1502 else if (token == Opt_grpjquota)
1503 return set_qf_name(sb, GRPQUOTA, &args[0]);
1504 else if (token == Opt_offusrjquota)
1505 return clear_qf_name(sb, USRQUOTA);
1506 else if (token == Opt_offgrpjquota)
1507 return clear_qf_name(sb, GRPQUOTA);
1508#endif
26092bf5
TT		 1509 if (args->from && match_int(args, &arg))
1510 return -1;
1511 switch (token) {
f7048605
TT		 1512 case Opt_noacl:
1513 case Opt_nouser_xattr:
1514 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1515 break;
26092bf5
TT		 1516 case Opt_sb:
1517 return 1; /* handled by get_sb_block() */
1518 case Opt_removed:
1519 ext4_msg(sb, KERN_WARNING,
1520 "Ignoring removed %s option", opt);
1521 return 1;
1522 case Opt_resuid:
08cefc7a
EB		 1523 uid = make_kuid(current_user_ns(), arg);
1524 if (!uid_valid(uid)) {
1525 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1526 return -1;
1527 }
1528 sbi->s_resuid = uid;
26092bf5
TT		 1529 return 1;
1530 case Opt_resgid:
08cefc7a
EB		 1531 gid = make_kgid(current_user_ns(), arg);
1532 if (!gid_valid(gid)) {
1533 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1534 return -1;
1535 }
1536 sbi->s_resgid = gid;
26092bf5
TT		 1537 return 1;
1538 case Opt_abort:
1539 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1540 return 1;
1541 case Opt_i_version:
1542 sb->s_flags |= MS_I_VERSION;
1543 return 1;
1544 case Opt_journal_dev:
1545 if (is_remount) {
1546 ext4_msg(sb, KERN_ERR,
1547 "Cannot specify journal on remount");
1548 return -1;
1549 }
1550 *journal_devnum = arg;
1551 return 1;
1552 case Opt_journal_ioprio:
1553 if (arg < 0 || arg > 7)
1554 return -1;
1555 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1556 return 1;
1557 }
1558
1559 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1560 if (token != m->token)
1561 continue;
1562 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1563 return -1;
1564 if (m->flags & MOPT_EXPLICIT)
1565 set_opt2(sb, EXPLICIT_DELALLOC);
1566 if (m->flags & MOPT_CLEAR_ERR)
1567 clear_opt(sb, ERRORS_MASK);
1568 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1569 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1570 "options when quota turned on");
1571 return -1;
1572 }
1573
1574 if (m->flags & MOPT_NOSUPPORT) {
1575 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1576 } else if (token == Opt_commit) {
1577 if (arg == 0)
1578 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1579 sbi->s_commit_interval = HZ * arg;
1580 } else if (token == Opt_max_batch_time) {
1581 if (arg == 0)
1582 arg = EXT4_DEF_MAX_BATCH_TIME;
1583 sbi->s_max_batch_time = arg;
1584 } else if (token == Opt_min_batch_time) {
1585 sbi->s_min_batch_time = arg;
1586 } else if (token == Opt_inode_readahead_blks) {
1587 if (arg > (1 << 30))
1588 return -1;
1589 if (arg && !is_power_of_2(arg)) {
b31e1552 1590 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1591 "EXT4-fs: inode_readahead_blks"
1592 " must be a power of 2");
1593 return -1;
ac27a0ec 1594 }
26092bf5
TT		 1595 sbi->s_inode_readahead_blks = arg;
1596 } else if (token == Opt_init_itable) {
1597 set_opt(sb, INIT_INODE_TABLE);
1598 if (!args->from)
1599 arg = EXT4_DEF_LI_WAIT_MULT;
1600 sbi->s_li_wait_mult = arg;
1601 } else if (token == Opt_stripe) {
1602 sbi->s_stripe = arg;
1603 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1604 if (is_remount) {
eb513689
TT		 1605 if (!sbi->s_journal)
1606 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1607 else if (test_opt(sb, DATA_FLAGS) !=
1608 m->mount_opt) {
b31e1552 1609 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1610 "Cannot change data mode on remount");
1611 return -1;
ac27a0ec
DK		 1612 }
1613 } else {
fd8c37ec 1614 clear_opt(sb, DATA_FLAGS);
26092bf5 1615 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1616 }
ac27a0ec 1617#ifdef CONFIG_QUOTA
26092bf5 1618 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1619 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1620 sbi->s_jquota_fmt != m->mount_opt) {
1621 ext4_msg(sb, KERN_ERR, "Cannot "
1622 "change journaled quota options "
1623 "when quota turned on");
1624 return -1;
ac27a0ec 1625 }
26092bf5 1626 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1627#endif
26092bf5
TT		 1628 } else {
1629 if (!args->from)
1630 arg = 1;
1631 if (m->flags & MOPT_CLEAR)
1632 arg = !arg;
1633 else if (unlikely(!(m->flags & MOPT_SET))) {
1634 ext4_msg(sb, KERN_WARNING,
1635 "buggy handling of option %s", opt);
1636 WARN_ON(1);
1637 return -1;
3197ebdb 1638 }
26092bf5
TT		 1639 if (arg != 0)
1640 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1641 else
26092bf5 1642 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1643 }
26092bf5
TT		 1644 return 1;
1645 }
1646 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1647 "or missing value", opt);
1648 return -1;
1649}
1650
1651static int parse_options(char *options, struct super_block *sb,
1652 unsigned long *journal_devnum,
1653 unsigned int *journal_ioprio,
1654 int is_remount)
1655{
db7e5c66 1656#ifdef CONFIG_QUOTA
26092bf5 1657 struct ext4_sb_info *sbi = EXT4_SB(sb);
db7e5c66 1658#endif
26092bf5
TT		 1659 char *p;
1660 substring_t args[MAX_OPT_ARGS];
1661 int token;
1662
1663 if (!options)
1664 return 1;
1665
1666 while ((p = strsep(&options, ",")) != NULL) {
1667 if (!*p)
1668 continue;
1669 /*
1670 * Initialize args struct so we know whether arg was
1671 * found; some options take optional arguments.
1672 */
1673 args[0].to = args[0].from = 0;
1674 token = match_token(p, tokens, args);
1675 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1676 journal_ioprio, is_remount) < 0)
1677 return 0;
ac27a0ec
DK		 1678 }
1679#ifdef CONFIG_QUOTA
1680 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1681 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1682 clear_opt(sb, USRQUOTA);
ac27a0ec 1683
482a7425 1684 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1685 clear_opt(sb, GRPQUOTA);
ac27a0ec 1686
56c50f11 1687 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1688 ext4_msg(sb, KERN_ERR, "old and new quota "
1689 "format mixing");
ac27a0ec
DK		 1690 return 0;
1691 }
1692
1693 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1694 ext4_msg(sb, KERN_ERR, "journaled quota format "
1695 "not specified");
ac27a0ec
DK		 1696 return 0;
1697 }
1698 } else {
1699 if (sbi->s_jquota_fmt) {
b31e1552 1700 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1701 "specified with no journaling "
b31e1552 1702 "enabled");
ac27a0ec
DK		 1703 return 0;
1704 }
1705 }
1706#endif
1707 return 1;
1708}
1709
2adf6da8
TT		 1710static inline void ext4_show_quota_options(struct seq_file *seq,
1711 struct super_block *sb)
1712{
1713#if defined(CONFIG_QUOTA)
1714 struct ext4_sb_info *sbi = EXT4_SB(sb);
1715
1716 if (sbi->s_jquota_fmt) {
1717 char *fmtname = "";
1718
1719 switch (sbi->s_jquota_fmt) {
1720 case QFMT_VFS_OLD:
1721 fmtname = "vfsold";
1722 break;
1723 case QFMT_VFS_V0:
1724 fmtname = "vfsv0";
1725 break;
1726 case QFMT_VFS_V1:
1727 fmtname = "vfsv1";
1728 break;
1729 }
1730 seq_printf(seq, ",jqfmt=%s", fmtname);
1731 }
1732
1733 if (sbi->s_qf_names[USRQUOTA])
1734 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1735
1736 if (sbi->s_qf_names[GRPQUOTA])
1737 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1738
1739 if (test_opt(sb, USRQUOTA))
1740 seq_puts(seq, ",usrquota");
1741
1742 if (test_opt(sb, GRPQUOTA))
1743 seq_puts(seq, ",grpquota");
1744#endif
1745}
1746
5a916be1
TT		 1747static const char *token2str(int token)
1748{
1749 static const struct match_token *t;
1750
1751 for (t = tokens; t->token != Opt_err; t++)
1752 if (t->token == token && !strchr(t->pattern, '='))
1753 break;
1754 return t->pattern;
1755}
1756
2adf6da8
TT		 1757/*
1758 * Show an option if
1759 * - it's set to a non-default value OR
1760 * - if the per-sb default is different from the global default
1761 */
66acdcf4
TT		 1762static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1763 int nodefs)
2adf6da8 1764{
2adf6da8
TT		 1765 struct ext4_sb_info *sbi = EXT4_SB(sb);
1766 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1767 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1768 const struct mount_opts *m;
66acdcf4 1769 char sep = nodefs ? '\n' : ',';
2adf6da8 1770
66acdcf4
TT		 1771#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1772#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1773
1774 if (sbi->s_sb_block != 1)
5a916be1
TT		 1775 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1776
1777 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1778 int want_set = m->flags & MOPT_SET;
1779 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1780 (m->flags & MOPT_CLEAR_ERR))
1781 continue;
66acdcf4 1782 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1783 continue; /* skip if same as the default */
1784 if ((want_set &&
1785 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1786 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1787 continue; /* select Opt_noFoo vs Opt_Foo */
1788 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1789 }
5a916be1 1790
08cefc7a 1791 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1792 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1793 SEQ_OPTS_PRINT("resuid=%u",
1794 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1795 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1796 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1797 SEQ_OPTS_PRINT("resgid=%u",
1798 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1799 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1800 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1801 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1802 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1803 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1804 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1805 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1806 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1807 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1808 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1809 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1810 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1811 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1812 if (sb->s_flags & MS_I_VERSION)
5a916be1 1813 SEQ_OPTS_PUTS("i_version");
66acdcf4 1814 if (nodefs || sbi->s_stripe)
5a916be1 1815 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1816 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1817 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1818 SEQ_OPTS_PUTS("data=journal");
1819 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1820 SEQ_OPTS_PUTS("data=ordered");
1821 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1822 SEQ_OPTS_PUTS("data=writeback");
1823 }
66acdcf4
TT		 1824 if (nodefs ||
1825 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1826 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1827 sbi->s_inode_readahead_blks);
2adf6da8 1828
66acdcf4
TT		 1829 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1830 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1831 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2adf6da8
TT		 1832
1833 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1834 return 0;
1835}
1836
66acdcf4
TT		 1837static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1838{
1839 return _ext4_show_options(seq, root->d_sb, 0);
1840}
1841
1842static int options_seq_show(struct seq_file *seq, void *offset)
1843{
1844 struct super_block *sb = seq->private;
1845 int rc;
1846
1847 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1848 rc = _ext4_show_options(seq, sb, 1);
1849 seq_puts(seq, "\n");
1850 return rc;
1851}
1852
1853static int options_open_fs(struct inode *inode, struct file *file)
1854{
1855 return single_open(file, options_seq_show, PDE(inode)->data);
1856}
1857
1858static const struct file_operations ext4_seq_options_fops = {
1859 .owner = THIS_MODULE,
1860 .open = options_open_fs,
1861 .read = seq_read,
1862 .llseek = seq_lseek,
1863 .release = single_release,
1864};
1865
617ba13b 1866static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1867 int read_only)
1868{
617ba13b 1869 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1870 int res = 0;
1871
617ba13b 1872 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1873 ext4_msg(sb, KERN_ERR, "revision level too high, "
1874 "forcing read-only mode");
ac27a0ec
DK		 1875 res = MS_RDONLY;
1876 }
1877 if (read_only)
281b5995 1878 goto done;
617ba13b 1879 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1880 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1881 "running e2fsck is recommended");
617ba13b 1882 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1883 ext4_msg(sb, KERN_WARNING,
1884 "warning: mounting fs with errors, "
1885 "running e2fsck is recommended");
ed3ce80a 1886 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1887 le16_to_cpu(es->s_mnt_count) >=
1888 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1889 ext4_msg(sb, KERN_WARNING,
1890 "warning: maximal mount count reached, "
1891 "running e2fsck is recommended");
ac27a0ec
DK		 1892 else if (le32_to_cpu(es->s_checkinterval) &&
1893 (le32_to_cpu(es->s_lastcheck) +
1894 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1895 ext4_msg(sb, KERN_WARNING,
1896 "warning: checktime reached, "
1897 "running e2fsck is recommended");
0b8e58a1 1898 if (!sbi->s_journal)
0390131b 1899 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1900 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1901 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1902 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1903 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1904 ext4_update_dynamic_rev(sb);
0390131b
FM		 1905 if (sbi->s_journal)
1906 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1907
e2d67052 1908 ext4_commit_super(sb, 1);
281b5995 1909done:
ac27a0ec 1910 if (test_opt(sb, DEBUG))
a9df9a49 1911 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1912 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1913 sb->s_blocksize,
1914 sbi->s_groups_count,
617ba13b
MC		 1915 EXT4_BLOCKS_PER_GROUP(sb),
1916 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1917 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1918
7abc52c2 1919 cleancache_init_fs(sb);
ac27a0ec
DK		 1920 return res;
1921}
1922
772cb7c8
JS		 1923static int ext4_fill_flex_info(struct super_block *sb)
1924{
1925 struct ext4_sb_info *sbi = EXT4_SB(sb);
1926 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1927 ext4_group_t flex_group_count;
1928 ext4_group_t flex_group;
d50f2ab6 1929 unsigned int groups_per_flex = 0;
c5ca7c76 1930 size_t size;
772cb7c8
JS		 1931 int i;
1932
503358ae 1933 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1934 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1935 sbi->s_log_groups_per_flex = 0;
1936 return 1;
1937 }
d50f2ab6 1938 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1939
c62a11fd
FB		 1940 /* We allocate both existing and potentially added groups */
1941 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1942 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1943 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1944 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1945 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1946 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1947 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1948 flex_group_count);
1949 goto failed;
772cb7c8 1950 }
772cb7c8 1951
772cb7c8 1952 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1953 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1954
1955 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1956 atomic_add(ext4_free_inodes_count(sb, gdp),
1957 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1958 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1959 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1960 atomic_add(ext4_used_dirs_count(sb, gdp),
1961 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1962 }
1963
1964 return 1;
1965failed:
1966 return 0;
1967}
1968
feb0ab32
DW		 1969static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1970 struct ext4_group_desc *gdp)
717d50e4 1971{
feb0ab32 1972 int offset;
717d50e4 1973 __u16 crc = 0;
feb0ab32 1974 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1975
feb0ab32
DW		 1976 if ((sbi->s_es->s_feature_ro_compat &
1977 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1978 /* Use new metadata_csum algorithm */
1979 __u16 old_csum;
1980 __u32 csum32;
1981
1982 old_csum = gdp->bg_checksum;
1983 gdp->bg_checksum = 0;
1984 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1985 sizeof(le_group));
1986 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1987 sbi->s_desc_size);
1988 gdp->bg_checksum = old_csum;
1989
1990 crc = csum32 & 0xFFFF;
1991 goto out;
717d50e4
AD		 1992 }
1993
feb0ab32
DW		 1994 /* old crc16 code */
1995 offset = offsetof(struct ext4_group_desc, bg_checksum);
1996
1997 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1998 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1999 crc = crc16(crc, (__u8 *)gdp, offset);
2000 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2001 /* for checksum of struct ext4_group_desc do the rest...*/
2002 if ((sbi->s_es->s_feature_incompat &
2003 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2004 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2005 crc = crc16(crc, (__u8 *)gdp + offset,
2006 le16_to_cpu(sbi->s_es->s_desc_size) -
2007 offset);
2008
2009out:
717d50e4
AD		 2010 return cpu_to_le16(crc);
2011}
2012
feb0ab32 2013int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2014 struct ext4_group_desc *gdp)
2015{
feb0ab32
DW		 2016 if (ext4_has_group_desc_csum(sb) &&
2017 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2018 block_group, gdp)))
717d50e4
AD		 2019 return 0;
2020
2021 return 1;
2022}
2023
feb0ab32
DW		 2024void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2025 struct ext4_group_desc *gdp)
2026{
2027 if (!ext4_has_group_desc_csum(sb))
2028 return;
2029 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2030}
2031
ac27a0ec 2032/* Called at mount-time, super-block is locked */
bfff6873
LC		 2033static int ext4_check_descriptors(struct super_block *sb,
2034 ext4_group_t *first_not_zeroed)
ac27a0ec 2035{
617ba13b
MC		 2036 struct ext4_sb_info *sbi = EXT4_SB(sb);
2037 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2038 ext4_fsblk_t last_block;
bd81d8ee
LV		 2039 ext4_fsblk_t block_bitmap;
2040 ext4_fsblk_t inode_bitmap;
2041 ext4_fsblk_t inode_table;
ce421581 2042 int flexbg_flag = 0;
bfff6873 2043 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2044
ce421581
JS		 2045 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2046 flexbg_flag = 1;
2047
af5bc92d 2048 ext4_debug("Checking group descriptors");
ac27a0ec 2049
197cd65a
AM		 2050 for (i = 0; i < sbi->s_groups_count; i++) {
2051 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2052
ce421581 2053 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2054 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2055 else
2056 last_block = first_block +
617ba13b 2057 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2058
bfff6873
LC		 2059 if ((grp == sbi->s_groups_count) &&
2060 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2061 grp = i;
2062
8fadc143 2063 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2064 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2065 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2066 "Block bitmap for group %u not in group "
b31e1552 2067 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2068 return 0;
2069 }
8fadc143 2070 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2071 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2072 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2073 "Inode bitmap for group %u not in group "
b31e1552 2074 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2075 return 0;
2076 }
8fadc143 2077 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2078 if (inode_table < first_block ||
2b2d6d01 2079 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2080 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2081 "Inode table for group %u not in group "
b31e1552 2082 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2083 return 0;
2084 }
955ce5f5 2085 ext4_lock_group(sb, i);
feb0ab32 2086 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2087 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2088 "Checksum for group %u failed (%u!=%u)",
2089 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2090 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2091 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2092 ext4_unlock_group(sb, i);
8a266467 2093 return 0;
7ee1ec4c 2094 }
717d50e4 2095 }
955ce5f5 2096 ext4_unlock_group(sb, i);
ce421581
JS		 2097 if (!flexbg_flag)
2098 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2099 }
bfff6873
LC		 2100 if (NULL != first_not_zeroed)
2101 *first_not_zeroed = grp;
ac27a0ec 2102
5dee5437
TT		 2103 ext4_free_blocks_count_set(sbi->s_es,
2104 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2105 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2106 return 1;
2107}
2108
617ba13b 2109/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2110 * the superblock) which were deleted from all directories, but held open by
2111 * a process at the time of a crash. We walk the list and try to delete these
2112 * inodes at recovery time (only with a read-write filesystem).
2113 *
2114 * In order to keep the orphan inode chain consistent during traversal (in
2115 * case of crash during recovery), we link each inode into the superblock
2116 * orphan list_head and handle it the same way as an inode deletion during
2117 * normal operation (which journals the operations for us).
2118 *
2119 * We only do an iget() and an iput() on each inode, which is very safe if we
2120 * accidentally point at an in-use or already deleted inode. The worst that
2121 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2122 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2123 * e2fsck was run on this filesystem, and it must have already done the orphan
2124 * inode cleanup for us, so we can safely abort without any further action.
2125 */
2b2d6d01
TT		 2126static void ext4_orphan_cleanup(struct super_block *sb,
2127 struct ext4_super_block *es)
ac27a0ec
DK		 2128{
2129 unsigned int s_flags = sb->s_flags;
2130 int nr_orphans = 0, nr_truncates = 0;
2131#ifdef CONFIG_QUOTA
2132 int i;
2133#endif
2134 if (!es->s_last_orphan) {
2135 jbd_debug(4, "no orphan inodes to clean up\n");
2136 return;
2137 }
2138
a8f48a95 2139 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2140 ext4_msg(sb, KERN_ERR, "write access "
2141 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2142 return;
2143 }
2144
d39195c3
AG		 2145 /* Check if feature set would not allow a r/w mount */
2146 if (!ext4_feature_set_ok(sb, 0)) {
2147 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2148 "unknown ROCOMPAT features");
2149 return;
2150 }
2151
617ba13b 2152 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2153 if (es->s_last_orphan)
2154 jbd_debug(1, "Errors on filesystem, "
2155 "clearing orphan list.\n");
2156 es->s_last_orphan = 0;
2157 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2158 return;
2159 }
2160
2161 if (s_flags & MS_RDONLY) {
b31e1552 2162 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2163 sb->s_flags &= ~MS_RDONLY;
2164 }
2165#ifdef CONFIG_QUOTA
2166 /* Needed for iput() to work correctly and not trash data */
2167 sb->s_flags |= MS_ACTIVE;
2168 /* Turn on quotas so that they are updated correctly */
2169 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2170 if (EXT4_SB(sb)->s_qf_names[i]) {
2171 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2172 if (ret < 0)
b31e1552
ES		 2173 ext4_msg(sb, KERN_ERR,
2174 "Cannot turn on journaled "
2175 "quota: error %d", ret);
ac27a0ec
DK		 2176 }
2177 }
2178#endif
2179
2180 while (es->s_last_orphan) {
2181 struct inode *inode;
2182
97bd42b9
JB		 2183 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2184 if (IS_ERR(inode)) {
ac27a0ec
DK		 2185 es->s_last_orphan = 0;
2186 break;
2187 }
2188
617ba13b 2189 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2190 dquot_initialize(inode);
ac27a0ec 2191 if (inode->i_nlink) {
b31e1552
ES		 2192 ext4_msg(sb, KERN_DEBUG,
2193 "%s: truncating inode %lu to %lld bytes",
46e665e9 2194 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2195 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2196 inode->i_ino, inode->i_size);
617ba13b 2197 ext4_truncate(inode);
ac27a0ec
DK		 2198 nr_truncates++;
2199 } else {
b31e1552
ES		 2200 ext4_msg(sb, KERN_DEBUG,
2201 "%s: deleting unreferenced inode %lu",
46e665e9 2202 __func__, inode->i_ino);
ac27a0ec
DK		 2203 jbd_debug(2, "deleting unreferenced inode %lu\n",
2204 inode->i_ino);
2205 nr_orphans++;
2206 }
2207 iput(inode); /* The delete magic happens here! */
2208 }
2209
2b2d6d01 2210#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2211
2212 if (nr_orphans)
b31e1552
ES		 2213 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2214 PLURAL(nr_orphans));
ac27a0ec 2215 if (nr_truncates)
b31e1552
ES		 2216 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2217 PLURAL(nr_truncates));
ac27a0ec
DK		 2218#ifdef CONFIG_QUOTA
2219 /* Turn quotas off */
2220 for (i = 0; i < MAXQUOTAS; i++) {
2221 if (sb_dqopt(sb)->files[i])
287a8095 2222 dquot_quota_off(sb, i);
ac27a0ec
DK		 2223 }
2224#endif
2225 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2226}
0b8e58a1 2227
cd2291a4
ES		 2228/*
2229 * Maximal extent format file size.
2230 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2231 * extent format containers, within a sector_t, and within i_blocks
2232 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2233 * so that won't be a limiting factor.
2234 *
f17722f9
LC		 2235 * However there is other limiting factor. We do store extents in the form
2236 * of starting block and length, hence the resulting length of the extent
2237 * covering maximum file size must fit into on-disk format containers as
2238 * well. Given that length is always by 1 unit bigger than max unit (because
2239 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2240 *
cd2291a4
ES		 2241 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2242 */
f287a1a5 2243static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2244{
2245 loff_t res;
2246 loff_t upper_limit = MAX_LFS_FILESIZE;
2247
2248 /* small i_blocks in vfs inode? */
f287a1a5 2249 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2250 /*
90c699a9 2251 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2252 * i_block represent total blocks in 512 bytes
2253 * 32 == size of vfs inode i_blocks * 8
2254 */
2255 upper_limit = (1LL << 32) - 1;
2256
2257 /* total blocks in file system block size */
2258 upper_limit >>= (blkbits - 9);
2259 upper_limit <<= blkbits;
2260 }
2261
f17722f9
LC		 2262 /*
2263 * 32-bit extent-start container, ee_block. We lower the maxbytes
2264 * by one fs block, so ee_len can cover the extent of maximum file
2265 * size
2266 */
2267 res = (1LL << 32) - 1;
cd2291a4 2268 res <<= blkbits;
cd2291a4
ES		 2269
2270 /* Sanity check against vm- & vfs- imposed limits */
2271 if (res > upper_limit)
2272 res = upper_limit;
2273
2274 return res;
2275}
ac27a0ec 2276
ac27a0ec 2277/*
cd2291a4 2278 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2279 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2280 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2281 */
f287a1a5 2282static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2283{
617ba13b 2284 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2285 int meta_blocks;
2286 loff_t upper_limit;
0b8e58a1
AD		 2287 /* This is calculated to be the largest file size for a dense, block
2288 * mapped file such that the file's total number of 512-byte sectors,
2289 * including data and all indirect blocks, does not exceed (2^48 - 1).
2290 *
2291 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2292 * number of 512-byte sectors of the file.
0fc1b451
AK		 2293 */
2294
f287a1a5 2295 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2296 /*
90c699a9 2297 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2298 * the inode i_block field represents total file blocks in
2299 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2300 */
2301 upper_limit = (1LL << 32) - 1;
2302
2303 /* total blocks in file system block size */
2304 upper_limit >>= (bits - 9);
2305
2306 } else {
8180a562
AK		 2307 /*
2308 * We use 48 bit ext4_inode i_blocks
2309 * With EXT4_HUGE_FILE_FL set the i_blocks
2310 * represent total number of blocks in
2311 * file system block size
2312 */
0fc1b451
AK		 2313 upper_limit = (1LL << 48) - 1;
2314
0fc1b451
AK		 2315 }
2316
2317 /* indirect blocks */
2318 meta_blocks = 1;
2319 /* double indirect blocks */
2320 meta_blocks += 1 + (1LL << (bits-2));
2321 /* tripple indirect blocks */
2322 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2323
2324 upper_limit -= meta_blocks;
2325 upper_limit <<= bits;
ac27a0ec
DK		 2326
2327 res += 1LL << (bits-2);
2328 res += 1LL << (2*(bits-2));
2329 res += 1LL << (3*(bits-2));
2330 res <<= bits;
2331 if (res > upper_limit)
2332 res = upper_limit;
0fc1b451
AK		 2333
2334 if (res > MAX_LFS_FILESIZE)
2335 res = MAX_LFS_FILESIZE;
2336
ac27a0ec
DK		 2337 return res;
2338}
2339
617ba13b 2340static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2341 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2342{
617ba13b 2343 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2344 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2345 int has_super = 0;
2346
2347 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2348
617ba13b 2349 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2350 nr < first_meta_bg)
70bbb3e0 2351 return logical_sb_block + nr + 1;
ac27a0ec 2352 bg = sbi->s_desc_per_block * nr;
617ba13b 2353 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2354 has_super = 1;
0b8e58a1 2355
617ba13b 2356 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2357}
2358
c9de560d
AT		 2359/**
2360 * ext4_get_stripe_size: Get the stripe size.
2361 * @sbi: In memory super block info
2362 *
2363 * If we have specified it via mount option, then
2364 * use the mount option value. If the value specified at mount time is
2365 * greater than the blocks per group use the super block value.
2366 * If the super block value is greater than blocks per group return 0.
2367 * Allocator needs it be less than blocks per group.
2368 *
2369 */
2370static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2371{
2372 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2373 unsigned long stripe_width =
2374 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2375 int ret;
c9de560d
AT		 2376
2377 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2378 ret = sbi->s_stripe;
2379 else if (stripe_width <= sbi->s_blocks_per_group)
2380 ret = stripe_width;
2381 else if (stride <= sbi->s_blocks_per_group)
2382 ret = stride;
2383 else
2384 ret = 0;
c9de560d 2385
3eb08658
DE		 2386 /*
2387 * If the stripe width is 1, this makes no sense and
2388 * we set it to 0 to turn off stripe handling code.
2389 */
2390 if (ret <= 1)
2391 ret = 0;
c9de560d 2392
3eb08658 2393 return ret;
c9de560d 2394}
ac27a0ec 2395
3197ebdb
TT		 2396/* sysfs supprt */
2397
2398struct ext4_attr {
2399 struct attribute attr;
2400 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2401 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2402 const char *, size_t);
2403 int offset;
2404};
2405
2406static int parse_strtoul(const char *buf,
2407 unsigned long max, unsigned long *value)
2408{
2409 char *endp;
2410
e7d2860b
AGR		 2411 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2412 endp = skip_spaces(endp);
3197ebdb
TT		 2413 if (*endp || *value > max)
2414 return -EINVAL;
2415
2416 return 0;
2417}
2418
2419static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2420 struct ext4_sb_info *sbi,
2421 char *buf)
2422{
2423 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2424 (s64) EXT4_C2B(sbi,
2425 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2426}
2427
2428static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2429 struct ext4_sb_info *sbi, char *buf)
2430{
2431 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2432
f613dfcb
TT		 2433 if (!sb->s_bdev->bd_part)
2434 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2435 return snprintf(buf, PAGE_SIZE, "%lu\n",
2436 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2437 sbi->s_sectors_written_start) >> 1);
2438}
2439
2440static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2441 struct ext4_sb_info *sbi, char *buf)
2442{
2443 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2444
f613dfcb
TT		 2445 if (!sb->s_bdev->bd_part)
2446 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2447 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2448 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2449 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2450 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2451}
2452
2453static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2454 struct ext4_sb_info *sbi,
2455 const char *buf, size_t count)
2456{
2457 unsigned long t;
2458
2459 if (parse_strtoul(buf, 0x40000000, &t))
2460 return -EINVAL;
2461
5dbd571d 2462 if (t && !is_power_of_2(t))
3197ebdb
TT		 2463 return -EINVAL;
2464
2465 sbi->s_inode_readahead_blks = t;
2466 return count;
2467}
2468
2469static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2470 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2471{
2472 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2473
2474 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2475}
2476
2477static ssize_t sbi_ui_store(struct ext4_attr *a,
2478 struct ext4_sb_info *sbi,
2479 const char *buf, size_t count)
2480{
2481 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2482 unsigned long t;
2483
2484 if (parse_strtoul(buf, 0xffffffff, &t))
2485 return -EINVAL;
2486 *ui = t;
2487 return count;
2488}
2489
2c0544b2
TT		 2490static ssize_t trigger_test_error(struct ext4_attr *a,
2491 struct ext4_sb_info *sbi,
2492 const char *buf, size_t count)
2493{
2494 int len = count;
2495
2496 if (!capable(CAP_SYS_ADMIN))
2497 return -EPERM;
2498
2499 if (len && buf[len-1] == '\n')
2500 len--;
2501
2502 if (len)
2503 ext4_error(sbi->s_sb, "%.*s", len, buf);
2504 return count;
2505}
2506
3197ebdb
TT		 2507#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2508static struct ext4_attr ext4_attr_##_name = { \
2509 .attr = {.name = __stringify(_name), .mode = _mode }, \
2510 .show = _show, \
2511 .store = _store, \
2512 .offset = offsetof(struct ext4_sb_info, _elname), \
2513}
2514#define EXT4_ATTR(name, mode, show, store) \
2515static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2516
857ac889 2517#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2518#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2519#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2520#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2521 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2522#define ATTR_LIST(name) &ext4_attr_##name.attr
2523
2524EXT4_RO_ATTR(delayed_allocation_blocks);
2525EXT4_RO_ATTR(session_write_kbytes);
2526EXT4_RO_ATTR(lifetime_write_kbytes);
2527EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2528 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2529EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2530EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2531EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2532EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2533EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2534EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2535EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2536EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2c0544b2 2537EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2538
2539static struct attribute *ext4_attrs[] = {
2540 ATTR_LIST(delayed_allocation_blocks),
2541 ATTR_LIST(session_write_kbytes),
2542 ATTR_LIST(lifetime_write_kbytes),
2543 ATTR_LIST(inode_readahead_blks),
11013911 2544 ATTR_LIST(inode_goal),
3197ebdb
TT		 2545 ATTR_LIST(mb_stats),
2546 ATTR_LIST(mb_max_to_scan),
2547 ATTR_LIST(mb_min_to_scan),
2548 ATTR_LIST(mb_order2_req),
2549 ATTR_LIST(mb_stream_req),
2550 ATTR_LIST(mb_group_prealloc),
55138e0b 2551 ATTR_LIST(max_writeback_mb_bump),
2c0544b2 2552 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2553 NULL,
2554};
2555
857ac889
LC		 2556/* Features this copy of ext4 supports */
2557EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2558EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2559
2560static struct attribute *ext4_feat_attrs[] = {
2561 ATTR_LIST(lazy_itable_init),
27ee40df 2562 ATTR_LIST(batched_discard),
857ac889
LC		 2563 NULL,
2564};
2565
3197ebdb
TT		 2566static ssize_t ext4_attr_show(struct kobject *kobj,
2567 struct attribute *attr, char *buf)
2568{
2569 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2570 s_kobj);
2571 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2572
2573 return a->show ? a->show(a, sbi, buf) : 0;
2574}
2575
2576static ssize_t ext4_attr_store(struct kobject *kobj,
2577 struct attribute *attr,
2578 const char *buf, size_t len)
2579{
2580 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2581 s_kobj);
2582 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2583
2584 return a->store ? a->store(a, sbi, buf, len) : 0;
2585}
2586
2587static void ext4_sb_release(struct kobject *kobj)
2588{
2589 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2590 s_kobj);
2591 complete(&sbi->s_kobj_unregister);
2592}
2593
52cf25d0 2594static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2595 .show = ext4_attr_show,
2596 .store = ext4_attr_store,
2597};
2598
2599static struct kobj_type ext4_ktype = {
2600 .default_attrs = ext4_attrs,
2601 .sysfs_ops = &ext4_attr_ops,
2602 .release = ext4_sb_release,
2603};
2604
857ac889
LC		 2605static void ext4_feat_release(struct kobject *kobj)
2606{
2607 complete(&ext4_feat->f_kobj_unregister);
2608}
2609
2610static struct kobj_type ext4_feat_ktype = {
2611 .default_attrs = ext4_feat_attrs,
2612 .sysfs_ops = &ext4_attr_ops,
2613 .release = ext4_feat_release,
2614};
2615
a13fb1a4
ES		 2616/*
2617 * Check whether this filesystem can be mounted based on
2618 * the features present and the RDONLY/RDWR mount requested.
2619 * Returns 1 if this filesystem can be mounted as requested,
2620 * 0 if it cannot be.
2621 */
2622static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2623{
2624 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2625 ext4_msg(sb, KERN_ERR,
2626 "Couldn't mount because of "
2627 "unsupported optional features (%x)",
2628 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2629 ~EXT4_FEATURE_INCOMPAT_SUPP));
2630 return 0;
2631 }
2632
2633 if (readonly)
2634 return 1;
2635
2636 /* Check that feature set is OK for a read-write mount */
2637 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2638 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2639 "unsupported optional features (%x)",
2640 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2641 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2642 return 0;
2643 }
2644 /*
2645 * Large file size enabled file system can only be mounted
2646 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2647 */
2648 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2649 if (sizeof(blkcnt_t) < sizeof(u64)) {
2650 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2651 "cannot be mounted RDWR without "
2652 "CONFIG_LBDAF");
2653 return 0;
2654 }
2655 }
bab08ab9
TT		 2656 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2657 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2658 ext4_msg(sb, KERN_ERR,
2659 "Can't support bigalloc feature without "
2660 "extents feature\n");
2661 return 0;
2662 }
7c319d32
AK		 2663
2664#ifndef CONFIG_QUOTA
2665 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2666 !readonly) {
2667 ext4_msg(sb, KERN_ERR,
2668 "Filesystem with quota feature cannot be mounted RDWR "
2669 "without CONFIG_QUOTA");
2670 return 0;
2671 }
2672#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2673 return 1;
2674}
2675
66e61a9e
TT		 2676/*
2677 * This function is called once a day if we have errors logged
2678 * on the file system
2679 */
2680static void print_daily_error_info(unsigned long arg)
2681{
2682 struct super_block *sb = (struct super_block *) arg;
2683 struct ext4_sb_info *sbi;
2684 struct ext4_super_block *es;
2685
2686 sbi = EXT4_SB(sb);
2687 es = sbi->s_es;
2688
2689 if (es->s_error_count)
2690 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2691 le32_to_cpu(es->s_error_count));
2692 if (es->s_first_error_time) {
2693 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2694 sb->s_id, le32_to_cpu(es->s_first_error_time),
2695 (int) sizeof(es->s_first_error_func),
2696 es->s_first_error_func,
2697 le32_to_cpu(es->s_first_error_line));
2698 if (es->s_first_error_ino)
2699 printk(": inode %u",
2700 le32_to_cpu(es->s_first_error_ino));
2701 if (es->s_first_error_block)
2702 printk(": block %llu", (unsigned long long)
2703 le64_to_cpu(es->s_first_error_block));
2704 printk("\n");
2705 }
2706 if (es->s_last_error_time) {
2707 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2708 sb->s_id, le32_to_cpu(es->s_last_error_time),
2709 (int) sizeof(es->s_last_error_func),
2710 es->s_last_error_func,
2711 le32_to_cpu(es->s_last_error_line));
2712 if (es->s_last_error_ino)
2713 printk(": inode %u",
2714 le32_to_cpu(es->s_last_error_ino));
2715 if (es->s_last_error_block)
2716 printk(": block %llu", (unsigned long long)
2717 le64_to_cpu(es->s_last_error_block));
2718 printk("\n");
2719 }
2720 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2721}
2722
bfff6873
LC		 2723/* Find next suitable group and run ext4_init_inode_table */
2724static int ext4_run_li_request(struct ext4_li_request *elr)
2725{
2726 struct ext4_group_desc *gdp = NULL;
2727 ext4_group_t group, ngroups;
2728 struct super_block *sb;
2729 unsigned long timeout = 0;
2730 int ret = 0;
2731
2732 sb = elr->lr_super;
2733 ngroups = EXT4_SB(sb)->s_groups_count;
2734
8e8ad8a5 2735 sb_start_write(sb);
bfff6873
LC		 2736 for (group = elr->lr_next_group; group < ngroups; group++) {
2737 gdp = ext4_get_group_desc(sb, group, NULL);
2738 if (!gdp) {
2739 ret = 1;
2740 break;
2741 }
2742
2743 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2744 break;
2745 }
2746
2747 if (group == ngroups)
2748 ret = 1;
2749
2750 if (!ret) {
2751 timeout = jiffies;
2752 ret = ext4_init_inode_table(sb, group,
2753 elr->lr_timeout ? 0 : 1);
2754 if (elr->lr_timeout == 0) {
51ce6511
LC		 2755 timeout = (jiffies - timeout) *
2756 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2757 elr->lr_timeout = timeout;
2758 }
2759 elr->lr_next_sched = jiffies + elr->lr_timeout;
2760 elr->lr_next_group = group + 1;
2761 }
8e8ad8a5 2762 sb_end_write(sb);
bfff6873
LC		 2763
2764 return ret;
2765}
2766
2767/*
2768 * Remove lr_request from the list_request and free the
4ed5c033 2769 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2770 */
2771static void ext4_remove_li_request(struct ext4_li_request *elr)
2772{
2773 struct ext4_sb_info *sbi;
2774
2775 if (!elr)
2776 return;
2777
2778 sbi = elr->lr_sbi;
2779
2780 list_del(&elr->lr_request);
2781 sbi->s_li_request = NULL;
2782 kfree(elr);
2783}
2784
2785static void ext4_unregister_li_request(struct super_block *sb)
2786{
1bb933fb
LC		 2787 mutex_lock(&ext4_li_mtx);
2788 if (!ext4_li_info) {
2789 mutex_unlock(&ext4_li_mtx);
bfff6873 2790 return;
1bb933fb 2791 }
bfff6873
LC		 2792
2793 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2794 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2795 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2796 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2797}
2798
8f1f7453
ES		 2799static struct task_struct *ext4_lazyinit_task;
2800
bfff6873
LC		 2801/*
2802 * This is the function where ext4lazyinit thread lives. It walks
2803 * through the request list searching for next scheduled filesystem.
2804 * When such a fs is found, run the lazy initialization request
2805 * (ext4_rn_li_request) and keep track of the time spend in this
2806 * function. Based on that time we compute next schedule time of
2807 * the request. When walking through the list is complete, compute
2808 * next waking time and put itself into sleep.
2809 */
2810static int ext4_lazyinit_thread(void *arg)
2811{
2812 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2813 struct list_head *pos, *n;
2814 struct ext4_li_request *elr;
4ed5c033 2815 unsigned long next_wakeup, cur;
bfff6873
LC		 2816
2817 BUG_ON(NULL == eli);
2818
bfff6873
LC		 2819cont_thread:
2820 while (true) {
2821 next_wakeup = MAX_JIFFY_OFFSET;
2822
2823 mutex_lock(&eli->li_list_mtx);
2824 if (list_empty(&eli->li_request_list)) {
2825 mutex_unlock(&eli->li_list_mtx);
2826 goto exit_thread;
2827 }
2828
2829 list_for_each_safe(pos, n, &eli->li_request_list) {
2830 elr = list_entry(pos, struct ext4_li_request,
2831 lr_request);
2832
b2c78cd0
TT		 2833 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2834 if (ext4_run_li_request(elr) != 0) {
2835 /* error, remove the lazy_init job */
2836 ext4_remove_li_request(elr);
2837 continue;
2838 }
bfff6873
LC		 2839 }
2840
2841 if (time_before(elr->lr_next_sched, next_wakeup))
2842 next_wakeup = elr->lr_next_sched;
2843 }
2844 mutex_unlock(&eli->li_list_mtx);
2845
a0acae0e 2846 try_to_freeze();
bfff6873 2847
4ed5c033
LC		 2848 cur = jiffies;
2849 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2850 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2851 cond_resched();
2852 continue;
2853 }
2854
4ed5c033
LC		 2855 schedule_timeout_interruptible(next_wakeup - cur);
2856
8f1f7453
ES		 2857 if (kthread_should_stop()) {
2858 ext4_clear_request_list();
2859 goto exit_thread;
2860 }
bfff6873
LC		 2861 }
2862
2863exit_thread:
2864 /*
2865 * It looks like the request list is empty, but we need
2866 * to check it under the li_list_mtx lock, to prevent any
2867 * additions into it, and of course we should lock ext4_li_mtx
2868 * to atomically free the list and ext4_li_info, because at
2869 * this point another ext4 filesystem could be registering
2870 * new one.
2871 */
2872 mutex_lock(&ext4_li_mtx);
2873 mutex_lock(&eli->li_list_mtx);
2874 if (!list_empty(&eli->li_request_list)) {
2875 mutex_unlock(&eli->li_list_mtx);
2876 mutex_unlock(&ext4_li_mtx);
2877 goto cont_thread;
2878 }
2879 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2880 kfree(ext4_li_info);
2881 ext4_li_info = NULL;
2882 mutex_unlock(&ext4_li_mtx);
2883
2884 return 0;
2885}
2886
2887static void ext4_clear_request_list(void)
2888{
2889 struct list_head *pos, *n;
2890 struct ext4_li_request *elr;
2891
2892 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2893 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2894 elr = list_entry(pos, struct ext4_li_request,
2895 lr_request);
2896 ext4_remove_li_request(elr);
2897 }
2898 mutex_unlock(&ext4_li_info->li_list_mtx);
2899}
2900
2901static int ext4_run_lazyinit_thread(void)
2902{
8f1f7453
ES		 2903 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2904 ext4_li_info, "ext4lazyinit");
2905 if (IS_ERR(ext4_lazyinit_task)) {
2906 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2907 ext4_clear_request_list();
bfff6873
LC		 2908 kfree(ext4_li_info);
2909 ext4_li_info = NULL;
92b97816 2910 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2911 "initialization thread\n",
2912 err);
2913 return err;
2914 }
2915 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2916 return 0;
2917}
2918
2919/*
2920 * Check whether it make sense to run itable init. thread or not.
2921 * If there is at least one uninitialized inode table, return
2922 * corresponding group number, else the loop goes through all
2923 * groups and return total number of groups.
2924 */
2925static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2926{
2927 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2928 struct ext4_group_desc *gdp = NULL;
2929
2930 for (group = 0; group < ngroups; group++) {
2931 gdp = ext4_get_group_desc(sb, group, NULL);
2932 if (!gdp)
2933 continue;
2934
2935 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2936 break;
2937 }
2938
2939 return group;
2940}
2941
2942static int ext4_li_info_new(void)
2943{
2944 struct ext4_lazy_init *eli = NULL;
2945
2946 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2947 if (!eli)
2948 return -ENOMEM;
2949
bfff6873
LC		 2950 INIT_LIST_HEAD(&eli->li_request_list);
2951 mutex_init(&eli->li_list_mtx);
2952
bfff6873
LC		 2953 eli->li_state |= EXT4_LAZYINIT_QUIT;
2954
2955 ext4_li_info = eli;
2956
2957 return 0;
2958}
2959
2960static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2961 ext4_group_t start)
2962{
2963 struct ext4_sb_info *sbi = EXT4_SB(sb);
2964 struct ext4_li_request *elr;
2965 unsigned long rnd;
2966
2967 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2968 if (!elr)
2969 return NULL;
2970
2971 elr->lr_super = sb;
2972 elr->lr_sbi = sbi;
2973 elr->lr_next_group = start;
2974
2975 /*
2976 * Randomize first schedule time of the request to
2977 * spread the inode table initialization requests
2978 * better.
2979 */
2980 get_random_bytes(&rnd, sizeof(rnd));
2981 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2982 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2983
2984 return elr;
2985}
2986
2987static int ext4_register_li_request(struct super_block *sb,
2988 ext4_group_t first_not_zeroed)
2989{
2990 struct ext4_sb_info *sbi = EXT4_SB(sb);
2991 struct ext4_li_request *elr;
2992 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2993 int ret = 0;
bfff6873 2994
51ce6511
LC		 2995 if (sbi->s_li_request != NULL) {
2996 /*
2997 * Reset timeout so it can be computed again, because
2998 * s_li_wait_mult might have changed.
2999 */
3000 sbi->s_li_request->lr_timeout = 0;
beed5ecb 3001 return 0;
51ce6511 3002 }
bfff6873
LC		 3003
3004 if (first_not_zeroed == ngroups ||
3005 (sb->s_flags & MS_RDONLY) ||
55ff3840 3006 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 3007 return 0;
bfff6873
LC		 3008
3009 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 3010 if (!elr)
3011 return -ENOMEM;
bfff6873
LC		 3012
3013 mutex_lock(&ext4_li_mtx);
3014
3015 if (NULL == ext4_li_info) {
3016 ret = ext4_li_info_new();
3017 if (ret)
3018 goto out;
3019 }
3020
3021 mutex_lock(&ext4_li_info->li_list_mtx);
3022 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3023 mutex_unlock(&ext4_li_info->li_list_mtx);
3024
3025 sbi->s_li_request = elr;
46e4690b
TM		 3026 /*
3027 * set elr to NULL here since it has been inserted to
3028 * the request_list and the removal and free of it is
3029 * handled by ext4_clear_request_list from now on.
3030 */
3031 elr = NULL;
bfff6873
LC		 3032
3033 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3034 ret = ext4_run_lazyinit_thread();
3035 if (ret)
3036 goto out;
3037 }
bfff6873 3038out:
beed5ecb
NK		 3039 mutex_unlock(&ext4_li_mtx);
3040 if (ret)
bfff6873 3041 kfree(elr);
bfff6873
LC		 3042 return ret;
3043}
3044
3045/*
3046 * We do not need to lock anything since this is called on
3047 * module unload.
3048 */
3049static void ext4_destroy_lazyinit_thread(void)
3050{
3051 /*
3052 * If thread exited earlier
3053 * there's nothing to be done.
3054 */
8f1f7453 3055 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3056 return;
3057
8f1f7453 3058 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3059}
3060
25ed6e8a
DW		 3061static int set_journal_csum_feature_set(struct super_block *sb)
3062{
3063 int ret = 1;
3064 int compat, incompat;
3065 struct ext4_sb_info *sbi = EXT4_SB(sb);
3066
3067 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3068 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3069 /* journal checksum v2 */
3070 compat = 0;
3071 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3072 } else {
3073 /* journal checksum v1 */
3074 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3075 incompat = 0;
3076 }
3077
3078 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3079 ret = jbd2_journal_set_features(sbi->s_journal,
3080 compat, 0,
3081 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3082 incompat);
3083 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3084 ret = jbd2_journal_set_features(sbi->s_journal,
3085 compat, 0,
3086 incompat);
3087 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3088 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3089 } else {
3090 jbd2_journal_clear_features(sbi->s_journal,
3091 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3092 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3093 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3094 }
3095
3096 return ret;
3097}
3098
952fc18e
TT		 3099/*
3100 * Note: calculating the overhead so we can be compatible with
3101 * historical BSD practice is quite difficult in the face of
3102 * clusters/bigalloc. This is because multiple metadata blocks from
3103 * different block group can end up in the same allocation cluster.
3104 * Calculating the exact overhead in the face of clustered allocation
3105 * requires either O(all block bitmaps) in memory or O(number of block
3106 * groups**2) in time. We will still calculate the superblock for
3107 * older file systems --- and if we come across with a bigalloc file
3108 * system with zero in s_overhead_clusters the estimate will be close to
3109 * correct especially for very large cluster sizes --- but for newer
3110 * file systems, it's better to calculate this figure once at mkfs
3111 * time, and store it in the superblock. If the superblock value is
3112 * present (even for non-bigalloc file systems), we will use it.
3113 */
3114static int count_overhead(struct super_block *sb, ext4_group_t grp,
3115 char *buf)
3116{
3117 struct ext4_sb_info *sbi = EXT4_SB(sb);
3118 struct ext4_group_desc *gdp;
3119 ext4_fsblk_t first_block, last_block, b;
3120 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3121 int s, j, count = 0;
3122
3123 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3124 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3125 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3126 for (i = 0; i < ngroups; i++) {
3127 gdp = ext4_get_group_desc(sb, i, NULL);
3128 b = ext4_block_bitmap(sb, gdp);
3129 if (b >= first_block && b <= last_block) {
3130 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3131 count++;
3132 }
3133 b = ext4_inode_bitmap(sb, gdp);
3134 if (b >= first_block && b <= last_block) {
3135 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3136 count++;
3137 }
3138 b = ext4_inode_table(sb, gdp);
3139 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3140 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3141 int c = EXT4_B2C(sbi, b - first_block);
3142 ext4_set_bit(c, buf);
3143 count++;
3144 }
3145 if (i != grp)
3146 continue;
3147 s = 0;
3148 if (ext4_bg_has_super(sb, grp)) {
3149 ext4_set_bit(s++, buf);
3150 count++;
3151 }
3152 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3153 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3154 count++;
3155 }
3156 }
3157 if (!count)
3158 return 0;
3159 return EXT4_CLUSTERS_PER_GROUP(sb) -
3160 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3161}
3162
3163/*
3164 * Compute the overhead and stash it in sbi->s_overhead
3165 */
3166int ext4_calculate_overhead(struct super_block *sb)
3167{
3168 struct ext4_sb_info *sbi = EXT4_SB(sb);
3169 struct ext4_super_block *es = sbi->s_es;
3170 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3171 ext4_fsblk_t overhead = 0;
3172 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3173
3174 memset(buf, 0, PAGE_SIZE);
3175 if (!buf)
3176 return -ENOMEM;
3177
3178 /*
3179 * Compute the overhead (FS structures). This is constant
3180 * for a given filesystem unless the number of block groups
3181 * changes so we cache the previous value until it does.
3182 */
3183
3184 /*
3185 * All of the blocks before first_data_block are overhead
3186 */
3187 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3188
3189 /*
3190 * Add the overhead found in each block group
3191 */
3192 for (i = 0; i < ngroups; i++) {
3193 int blks;
3194
3195 blks = count_overhead(sb, i, buf);
3196 overhead += blks;
3197 if (blks)
3198 memset(buf, 0, PAGE_SIZE);
3199 cond_resched();
3200 }
3201 sbi->s_overhead = overhead;
3202 smp_wmb();
3203 free_page((unsigned long) buf);
3204 return 0;
3205}
3206
2b2d6d01 3207static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3208{
d4c402d9 3209 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3210 struct buffer_head *bh;
617ba13b
MC		 3211 struct ext4_super_block *es = NULL;
3212 struct ext4_sb_info *sbi;
3213 ext4_fsblk_t block;
3214 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3215 ext4_fsblk_t logical_sb_block;
ac27a0ec 3216 unsigned long offset = 0;
ac27a0ec
DK		 3217 unsigned long journal_devnum = 0;
3218 unsigned long def_mount_opts;
3219 struct inode *root;
9f6200bb 3220 char *cp;
0390131b 3221 const char *descr;
dcc7dae3 3222 int ret = -ENOMEM;
281b5995 3223 int blocksize, clustersize;
4ec11028
TT		 3224 unsigned int db_count;
3225 unsigned int i;
281b5995 3226 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3227 __u64 blocks_count;
833f4077 3228 int err;
b3881f74 3229 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3230 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3231
3232 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3233 if (!sbi)
dcc7dae3 3234 goto out_free_orig;
705895b6
PE		 3235
3236 sbi->s_blockgroup_lock =
3237 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3238 if (!sbi->s_blockgroup_lock) {
3239 kfree(sbi);
dcc7dae3 3240 goto out_free_orig;
705895b6 3241 }
ac27a0ec 3242 sb->s_fs_info = sbi;
2c0544b2 3243 sbi->s_sb = sb;
ac27a0ec 3244 sbi->s_mount_opt = 0;
08cefc7a
EB		 3245 sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3246 sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
240799cd 3247 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3248 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3249 if (sb->s_bdev->bd_part)
3250 sbi->s_sectors_written_start =
3251 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3252
9f6200bb
TT		 3253 /* Cleanup superblock name */
3254 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3255 *cp = '!';
3256
dcc7dae3 3257 ret = -EINVAL;
617ba13b 3258 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3259 if (!blocksize) {
b31e1552 3260 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3261 goto out_fail;
3262 }
3263
3264 /*
617ba13b 3265 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3266 * block sizes. We need to calculate the offset from buffer start.
3267 */
617ba13b 3268 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3269 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3270 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3271 } else {
70bbb3e0 3272 logical_sb_block = sb_block;
ac27a0ec
DK		 3273 }
3274
70bbb3e0 3275 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3276 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3277 goto out_fail;
3278 }
3279 /*
3280 * Note: s_es must be initialized as soon as possible because
617ba13b 3281 * some ext4 macro-instructions depend on its value
ac27a0ec 3282 */
2716b802 3283 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3284 sbi->s_es = es;
3285 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3286 if (sb->s_magic != EXT4_SUPER_MAGIC)
3287 goto cantfind_ext4;
afc32f7e 3288 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3289
feb0ab32
DW		 3290 /* Warn if metadata_csum and gdt_csum are both set. */
3291 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3292 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3293 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3294 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3295 "redundant flags; please run fsck.");
3296
d25425f8
DW		 3297 /* Check for a known checksum algorithm */
3298 if (!ext4_verify_csum_type(sb, es)) {
3299 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3300 "unknown checksum algorithm.");
3301 silent = 1;
3302 goto cantfind_ext4;
3303 }
3304
0441984a
DW		 3305 /* Load the checksum driver */
3306 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3307 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3308 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3309 if (IS_ERR(sbi->s_chksum_driver)) {
3310 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3311 ret = PTR_ERR(sbi->s_chksum_driver);
3312 sbi->s_chksum_driver = NULL;
3313 goto failed_mount;
3314 }
3315 }
3316
a9c47317
DW		 3317 /* Check superblock checksum */
3318 if (!ext4_superblock_csum_verify(sb, es)) {
3319 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3320 "invalid superblock checksum. Run e2fsck?");
3321 silent = 1;
3322 goto cantfind_ext4;
3323 }
3324
3325 /* Precompute checksum seed for all metadata */
3326 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3327 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3328 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3329 sizeof(es->s_uuid));
3330
ac27a0ec
DK		 3331 /* Set defaults before we parse the mount options */
3332 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3333 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3334 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3335 set_opt(sb, DEBUG);
87f26807 3336 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3337 set_opt(sb, GRPID);
617ba13b 3338 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3339 set_opt(sb, NO_UID32);
ea663336 3340 /* xattr user namespace & acls are now defaulted on */
03010a33 3341#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3342 set_opt(sb, XATTR_USER);
2e7842b8 3343#endif
03010a33 3344#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3345 set_opt(sb, POSIX_ACL);
2e7842b8 3346#endif
6fd7a467 3347 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3348 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3349 set_opt(sb, JOURNAL_DATA);
617ba13b 3350 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3351 set_opt(sb, ORDERED_DATA);
617ba13b 3352 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3353 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3354
3355 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3356 set_opt(sb, ERRORS_PANIC);
bb4f397a 3357 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3358 set_opt(sb, ERRORS_CONT);
bb4f397a 3359 else
fd8c37ec 3360 set_opt(sb, ERRORS_RO);
8b67f04a 3361 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3362 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3363 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3364 set_opt(sb, DISCARD);
ac27a0ec 3365
08cefc7a
EB		 3366 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3367 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3368 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3369 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3370 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3371
8b67f04a 3372 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3373 set_opt(sb, BARRIER);
ac27a0ec 3374
dd919b98
AK		 3375 /*
3376 * enable delayed allocation by default
3377 * Use -o nodelalloc to turn it off
3378 */
8b67f04a
TT		 3379 if (!IS_EXT3_SB(sb) &&
3380 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3381 set_opt(sb, DELALLOC);
dd919b98 3382
51ce6511
LC		 3383 /*
3384 * set default s_li_wait_mult for lazyinit, for the case there is
3385 * no mount option specified.
3386 */
3387 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3388
8b67f04a 3389 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3390 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3391 ext4_msg(sb, KERN_WARNING,
3392 "failed to parse options in superblock: %s",
3393 sbi->s_es->s_mount_opts);
3394 }
5a916be1 3395 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3396 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3397 &journal_ioprio, 0))
ac27a0ec
DK		 3398 goto failed_mount;
3399
56889787
TT		 3400 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3401 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3402 "with data=journal disables delayed "
3403 "allocation and O_DIRECT support!\n");
3404 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3405 ext4_msg(sb, KERN_ERR, "can't mount with "
3406 "both data=journal and delalloc");
3407 goto failed_mount;
3408 }
3409 if (test_opt(sb, DIOREAD_NOLOCK)) {
3410 ext4_msg(sb, KERN_ERR, "can't mount with "
3411 "both data=journal and delalloc");
3412 goto failed_mount;
3413 }
3414 if (test_opt(sb, DELALLOC))
3415 clear_opt(sb, DELALLOC);
3416 }
3417
3418 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3419 if (test_opt(sb, DIOREAD_NOLOCK)) {
3420 if (blocksize < PAGE_SIZE) {
3421 ext4_msg(sb, KERN_ERR, "can't mount with "
3422 "dioread_nolock if block size != PAGE_SIZE");
3423 goto failed_mount;
3424 }
3425 }
3426
ac27a0ec 3427 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3428 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3429
617ba13b
MC		 3430 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3431 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3432 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3433 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3434 ext4_msg(sb, KERN_WARNING,
3435 "feature flags set on rev 0 fs, "
3436 "running e2fsck is recommended");
469108ff 3437
2035e776
TT		 3438 if (IS_EXT2_SB(sb)) {
3439 if (ext2_feature_set_ok(sb))
3440 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3441 "using the ext4 subsystem");
3442 else {
3443 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3444 "to feature incompatibilities");
3445 goto failed_mount;
3446 }
3447 }
3448
3449 if (IS_EXT3_SB(sb)) {
3450 if (ext3_feature_set_ok(sb))
3451 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3452 "using the ext4 subsystem");
3453 else {
3454 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3455 "to feature incompatibilities");
3456 goto failed_mount;
3457 }
3458 }
3459
ac27a0ec
DK		 3460 /*
3461 * Check feature flags regardless of the revision level, since we
3462 * previously didn't change the revision level when setting the flags,
3463 * so there is a chance incompat flags are set on a rev 0 filesystem.
3464 */
a13fb1a4 3465 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3466 goto failed_mount;
a13fb1a4 3467
617ba13b
MC		 3468 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3469 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3470 ext4_msg(sb, KERN_ERR,
3471 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3472 goto failed_mount;
3473 }
3474
ac27a0ec 3475 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3476 /* Validate the filesystem blocksize */
3477 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3478 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3479 blocksize);
ac27a0ec
DK		 3480 goto failed_mount;
3481 }
3482
2b2d6d01 3483 brelse(bh);
70bbb3e0
AM		 3484 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3485 offset = do_div(logical_sb_block, blocksize);
3486 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3487 if (!bh) {
b31e1552
ES		 3488 ext4_msg(sb, KERN_ERR,
3489 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3490 goto failed_mount;
3491 }
2716b802 3492 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3493 sbi->s_es = es;
617ba13b 3494 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3495 ext4_msg(sb, KERN_ERR,
3496 "Magic mismatch, very weird!");
ac27a0ec
DK		 3497 goto failed_mount;
3498 }
3499 }
3500
a13fb1a4
ES		 3501 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3502 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3503 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3504 has_huge_files);
3505 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3506
617ba13b
MC		 3507 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3508 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3509 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3510 } else {
3511 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3512 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3513 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3514 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3515 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3516 ext4_msg(sb, KERN_ERR,
3517 "unsupported inode size: %d",
2b2d6d01 3518 sbi->s_inode_size);
ac27a0ec
DK		 3519 goto failed_mount;
3520 }
ef7f3835
KS		 3521 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3522 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3523 }
0b8e58a1 3524
0d1ee42f
AR		 3525 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3526 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3527 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3528 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3529 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3530 ext4_msg(sb, KERN_ERR,
3531 "unsupported descriptor size %lu",
0d1ee42f
AR		 3532 sbi->s_desc_size);
3533 goto failed_mount;
3534 }
3535 } else
3536 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3537
ac27a0ec 3538 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3539 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3540 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3541 goto cantfind_ext4;
0b8e58a1 3542
617ba13b 3543 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3544 if (sbi->s_inodes_per_block == 0)
617ba13b 3545 goto cantfind_ext4;
ac27a0ec
DK		 3546 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3547 sbi->s_inodes_per_block;
0d1ee42f 3548 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3549 sbi->s_sbh = bh;
3550 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3551 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3552 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3553
2b2d6d01 3554 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3555 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3556 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3557 i = le32_to_cpu(es->s_flags);
3558 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3559 sbi->s_hash_unsigned = 3;
3560 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3561#ifdef __CHAR_UNSIGNED__
3562 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3563 sbi->s_hash_unsigned = 3;
3564#else
3565 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3566#endif
f99b2589 3567 }
ac27a0ec 3568
281b5995
TT		 3569 /* Handle clustersize */
3570 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3571 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3572 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3573 if (has_bigalloc) {
3574 if (clustersize < blocksize) {
3575 ext4_msg(sb, KERN_ERR,
3576 "cluster size (%d) smaller than "
3577 "block size (%d)", clustersize, blocksize);
3578 goto failed_mount;
3579 }
3580 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3581 le32_to_cpu(es->s_log_block_size);
3582 sbi->s_clusters_per_group =
3583 le32_to_cpu(es->s_clusters_per_group);
3584 if (sbi->s_clusters_per_group > blocksize * 8) {
3585 ext4_msg(sb, KERN_ERR,
3586 "#clusters per group too big: %lu",
3587 sbi->s_clusters_per_group);
3588 goto failed_mount;
3589 }
3590 if (sbi->s_blocks_per_group !=
3591 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3592 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3593 "clusters per group (%lu) inconsistent",
3594 sbi->s_blocks_per_group,
3595 sbi->s_clusters_per_group);
3596 goto failed_mount;
3597 }
3598 } else {
3599 if (clustersize != blocksize) {
3600 ext4_warning(sb, "fragment/cluster size (%d) != "
3601 "block size (%d)", clustersize,
3602 blocksize);
3603 clustersize = blocksize;
3604 }
3605 if (sbi->s_blocks_per_group > blocksize * 8) {
3606 ext4_msg(sb, KERN_ERR,
3607 "#blocks per group too big: %lu",
3608 sbi->s_blocks_per_group);
3609 goto failed_mount;
3610 }
3611 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3612 sbi->s_cluster_bits = 0;
ac27a0ec 3613 }
281b5995
TT		 3614 sbi->s_cluster_ratio = clustersize / blocksize;
3615
ac27a0ec 3616 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3617 ext4_msg(sb, KERN_ERR,
3618 "#inodes per group too big: %lu",
2b2d6d01 3619 sbi->s_inodes_per_group);
ac27a0ec
DK		 3620 goto failed_mount;
3621 }
3622
bf43d84b
ES		 3623 /*
3624 * Test whether we have more sectors than will fit in sector_t,
3625 * and whether the max offset is addressable by the page cache.
3626 */
5a9ae68a 3627 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3628 ext4_blocks_count(es));
5a9ae68a 3629 if (err) {
b31e1552 3630 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3631 " too large to mount safely on this system");
ac27a0ec 3632 if (sizeof(sector_t) < 8)
90c699a9 3633 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3634 ret = err;
ac27a0ec
DK		 3635 goto failed_mount;
3636 }
3637
617ba13b
MC		 3638 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3639 goto cantfind_ext4;
e7c95593 3640
0f2ddca6
FTN		 3641 /* check blocks count against device size */
3642 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3643 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3644 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3645 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3646 ext4_blocks_count(es), blocks_count);
3647 goto failed_mount;
3648 }
3649
0b8e58a1
AD		 3650 /*
3651 * It makes no sense for the first data block to be beyond the end
3652 * of the filesystem.
3653 */
3654 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3655 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3656 "block %u is beyond end of filesystem (%llu)",
3657 le32_to_cpu(es->s_first_data_block),
3658 ext4_blocks_count(es));
e7c95593
ES		 3659 goto failed_mount;
3660 }
bd81d8ee
LV		 3661 blocks_count = (ext4_blocks_count(es) -
3662 le32_to_cpu(es->s_first_data_block) +
3663 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3664 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3665 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3666 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3667 "(block count %llu, first data block %u, "
b31e1552 3668 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3669 ext4_blocks_count(es),
3670 le32_to_cpu(es->s_first_data_block),
3671 EXT4_BLOCKS_PER_GROUP(sb));
3672 goto failed_mount;
3673 }
bd81d8ee 3674 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3675 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3676 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3677 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3678 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3679 sbi->s_group_desc = ext4_kvmalloc(db_count *
3680 sizeof(struct buffer_head *),
3681 GFP_KERNEL);
ac27a0ec 3682 if (sbi->s_group_desc == NULL) {
b31e1552 3683 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3684 ret = -ENOMEM;
ac27a0ec
DK		 3685 goto failed_mount;
3686 }
3687
9f6200bb
TT		 3688 if (ext4_proc_root)
3689 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3690
66acdcf4
TT		 3691 if (sbi->s_proc)
3692 proc_create_data("options", S_IRUGO, sbi->s_proc,
3693 &ext4_seq_options_fops, sb);
3694
705895b6 3695 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3696
3697 for (i = 0; i < db_count; i++) {
70bbb3e0 3698 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3699 sbi->s_group_desc[i] = sb_bread(sb, block);
3700 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3701 ext4_msg(sb, KERN_ERR,
3702 "can't read group descriptor %d", i);
ac27a0ec
DK		 3703 db_count = i;
3704 goto failed_mount2;
3705 }
3706 }
bfff6873 3707 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3708 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3709 goto failed_mount2;
3710 }
772cb7c8
JS		 3711 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3712 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3713 ext4_msg(sb, KERN_ERR,
3714 "unable to initialize "
3715 "flex_bg meta info!");
772cb7c8
JS		 3716 goto failed_mount2;
3717 }
3718
ac27a0ec
DK		 3719 sbi->s_gdb_count = db_count;
3720 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3721 spin_lock_init(&sbi->s_next_gen_lock);
3722
04496411
TM		 3723 init_timer(&sbi->s_err_report);
3724 sbi->s_err_report.function = print_daily_error_info;
3725 sbi->s_err_report.data = (unsigned long) sb;
3726
57042651 3727 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3728 ext4_count_free_clusters(sb));
ce7e010a
TT		 3729 if (!err) {
3730 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3731 ext4_count_free_inodes(sb));
3732 }
3733 if (!err) {
3734 err = percpu_counter_init(&sbi->s_dirs_counter,
3735 ext4_count_dirs(sb));
3736 }
3737 if (!err) {
57042651 3738 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3739 }
3740 if (err) {
3741 ext4_msg(sb, KERN_ERR, "insufficient memory");
2cde417d 3742 ret = err;
ce7e010a
TT		 3743 goto failed_mount3;
3744 }
3745
c9de560d 3746 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3747 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3748
ac27a0ec
DK		 3749 /*
3750 * set up enough so that it can read an inode
3751 */
9ca92389
TT		 3752 if (!test_opt(sb, NOLOAD) &&
3753 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3754 sb->s_op = &ext4_sops;
3755 else
3756 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3757 sb->s_export_op = &ext4_export_ops;
3758 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3759#ifdef CONFIG_QUOTA
617ba13b
MC		 3760 sb->s_qcop = &ext4_qctl_operations;
3761 sb->dq_op = &ext4_quota_operations;
7c319d32
AK		 3762
3763 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
3764 /* Use qctl operations for hidden quota files. */
3765 sb->s_qcop = &ext4_qctl_sysfile_operations;
3766 }
ac27a0ec 3767#endif
f2fa2ffc
AK		 3768 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3769
ac27a0ec 3770 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3771 mutex_init(&sbi->s_orphan_lock);
8f82f840 3772 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3773
3774 sb->s_root = NULL;
3775
3776 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3777 EXT4_HAS_INCOMPAT_FEATURE(sb,
3778 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3779
c5e06d10
JL		 3780 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3781 !(sb->s_flags & MS_RDONLY))
3782 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3783 goto failed_mount3;
3784
ac27a0ec
DK		 3785 /*
3786 * The first inode we look at is the journal inode. Don't try
3787 * root first: it may be modified in the journal!
3788 */
3789 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3790 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3791 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3792 goto failed_mount3;
0390131b
FM		 3793 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3794 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3795 ext4_msg(sb, KERN_ERR, "required journal recovery "
3796 "suppressed and not mounted read-only");
744692dc 3797 goto failed_mount_wq;
ac27a0ec 3798 } else {
fd8c37ec 3799 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3800 sbi->s_journal = NULL;
3801 needs_recovery = 0;
3802 goto no_journal;
ac27a0ec
DK		 3803 }
3804
f32aaf2d 3805 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3806 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3807 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3808 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3809 goto failed_mount_wq;
eb40a09c
JS		 3810 }
3811
25ed6e8a
DW		 3812 if (!set_journal_csum_feature_set(sb)) {
3813 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3814 "feature set");
3815 goto failed_mount_wq;
d4da6c9c 3816 }
818d276c 3817
ac27a0ec
DK		 3818 /* We have now updated the journal if required, so we can
3819 * validate the data journaling mode. */
3820 switch (test_opt(sb, DATA_FLAGS)) {
3821 case 0:
3822 /* No mode set, assume a default based on the journal
63f57933
AM		 3823 * capabilities: ORDERED_DATA if the journal can
3824 * cope, else JOURNAL_DATA
3825 */
dab291af
MC		 3826 if (jbd2_journal_check_available_features
3827 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3828 set_opt(sb, ORDERED_DATA);
ac27a0ec 3829 else
fd8c37ec 3830 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3831 break;
3832
617ba13b
MC		 3833 case EXT4_MOUNT_ORDERED_DATA:
3834 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3835 if (!jbd2_journal_check_available_features
3836 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3837 ext4_msg(sb, KERN_ERR, "Journal does not support "
3838 "requested data journaling mode");
744692dc 3839 goto failed_mount_wq;
ac27a0ec
DK		 3840 }
3841 default:
3842 break;
3843 }
b3881f74 3844 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3845
18aadd47
BJ		 3846 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3847
ce7e010a
TT		 3848 /*
3849 * The journal may have updated the bg summary counts, so we
3850 * need to update the global counters.
3851 */
57042651 3852 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3853 ext4_count_free_clusters(sb));
ce7e010a
TT		 3854 percpu_counter_set(&sbi->s_freeinodes_counter,
3855 ext4_count_free_inodes(sb));
3856 percpu_counter_set(&sbi->s_dirs_counter,
3857 ext4_count_dirs(sb));
57042651 3858 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3859
ce7e010a 3860no_journal:
952fc18e
TT		 3861 /*
3862 * Get the # of file system overhead blocks from the
3863 * superblock if present.
3864 */
3865 if (es->s_overhead_clusters)
3866 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3867 else {
3868 ret = ext4_calculate_overhead(sb);
3869 if (ret)
3870 goto failed_mount_wq;
3871 }
3872
fd89d5f2
TH		 3873 /*
3874 * The maximum number of concurrent works can be high and
3875 * concurrency isn't really necessary. Limit it to 1.
3876 */
3877 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3878 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3879 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3880 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3881 goto failed_mount_wq;
3882 }
3883
ac27a0ec 3884 /*
dab291af 3885 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3886 * so we can safely mount the rest of the filesystem now.
3887 */
3888
1d1fe1ee
DH		 3889 root = ext4_iget(sb, EXT4_ROOT_INO);
3890 if (IS_ERR(root)) {
b31e1552 3891 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3892 ret = PTR_ERR(root);
32a9bb57 3893 root = NULL;
ac27a0ec
DK		 3894 goto failed_mount4;
3895 }
3896 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3897 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3898 iput(root);
ac27a0ec
DK		 3899 goto failed_mount4;
3900 }
48fde701 3901 sb->s_root = d_make_root(root);
1d1fe1ee 3902 if (!sb->s_root) {
b31e1552 3903 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3904 ret = -ENOMEM;
3905 goto failed_mount4;
3906 }
ac27a0ec 3907
7e84b621
ES		 3908 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3909 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3910
3911 /* determine the minimum size of new large inodes, if present */
3912 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3913 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3914 EXT4_GOOD_OLD_INODE_SIZE;
3915 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3916 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3917 if (sbi->s_want_extra_isize <
3918 le16_to_cpu(es->s_want_extra_isize))
3919 sbi->s_want_extra_isize =
3920 le16_to_cpu(es->s_want_extra_isize);
3921 if (sbi->s_want_extra_isize <
3922 le16_to_cpu(es->s_min_extra_isize))
3923 sbi->s_want_extra_isize =
3924 le16_to_cpu(es->s_min_extra_isize);
3925 }
3926 }
3927 /* Check if enough inode space is available */
3928 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3929 sbi->s_inode_size) {
3930 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3931 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3932 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3933 "available");
ef7f3835
KS		 3934 }
3935
6fd058f7
TT		 3936 err = ext4_setup_system_zone(sb);
3937 if (err) {
b31e1552 3938 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3939 "zone (%d)", err);
94bf608a 3940 goto failed_mount4a;
6fd058f7
TT		 3941 }
3942
c2774d84 3943 ext4_ext_init(sb);
9d99012f 3944 err = ext4_mb_init(sb);
c2774d84 3945 if (err) {
421f91d2 3946 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3947 err);
dcf2d804 3948 goto failed_mount5;
c2774d84
AK		 3949 }
3950
bfff6873
LC		 3951 err = ext4_register_li_request(sb, first_not_zeroed);
3952 if (err)
dcf2d804 3953 goto failed_mount6;
bfff6873 3954
3197ebdb
TT		 3955 sbi->s_kobj.kset = ext4_kset;
3956 init_completion(&sbi->s_kobj_unregister);
3957 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3958 "%s", sb->s_id);
dcf2d804
TM		 3959 if (err)
3960 goto failed_mount7;
3197ebdb 3961
617ba13b
MC		 3962 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3963 ext4_orphan_cleanup(sb, es);
3964 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3965 if (needs_recovery) {
b31e1552 3966 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3967 ext4_mark_recovery_complete(sb, es);
3968 }
3969 if (EXT4_SB(sb)->s_journal) {
3970 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3971 descr = " journalled data mode";
3972 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3973 descr = " ordered data mode";
3974 else
3975 descr = " writeback data mode";
3976 } else
3977 descr = "out journal";
3978
7c319d32
AK		 3979#ifdef CONFIG_QUOTA
3980 /* Enable quota usage during mount. */
3981 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
3982 !(sb->s_flags & MS_RDONLY)) {
3983 ret = ext4_enable_quotas(sb);
3984 if (ret)
3985 goto failed_mount7;
3986 }
3987#endif /* CONFIG_QUOTA */
3988
d4c402d9 3989 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3990 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3991 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3992
66e61a9e
TT		 3993 if (es->s_error_count)
3994 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3995
d4c402d9 3996 kfree(orig_data);
ac27a0ec
DK		 3997 return 0;
3998
617ba13b 3999cantfind_ext4:
ac27a0ec 4000 if (!silent)
b31e1552 4001 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4002 goto failed_mount;
4003
dcf2d804
TM		 4004failed_mount7:
4005 ext4_unregister_li_request(sb);
4006failed_mount6:
dcf2d804 4007 ext4_mb_release(sb);
94bf608a
AV		 4008failed_mount5:
4009 ext4_ext_release(sb);
dcf2d804 4010 ext4_release_system_zone(sb);
94bf608a
AV		 4011failed_mount4a:
4012 dput(sb->s_root);
32a9bb57 4013 sb->s_root = NULL;
94bf608a 4014failed_mount4:
b31e1552 4015 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 4016 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4017failed_mount_wq:
0390131b
FM		 4018 if (sbi->s_journal) {
4019 jbd2_journal_destroy(sbi->s_journal);
4020 sbi->s_journal = NULL;
4021 }
ac27a0ec 4022failed_mount3:
04496411 4023 del_timer(&sbi->s_err_report);
9933fc0a
TT		 4024 if (sbi->s_flex_groups)
4025 ext4_kvfree(sbi->s_flex_groups);
57042651 4026 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4027 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4028 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4029 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 4030 if (sbi->s_mmp_tsk)
4031 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4032failed_mount2:
4033 for (i = 0; i < db_count; i++)
4034 brelse(sbi->s_group_desc[i]);
f18a5f21 4035 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4036failed_mount:
0441984a
DW		 4037 if (sbi->s_chksum_driver)
4038 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4039 if (sbi->s_proc) {
66acdcf4 4040 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4041 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4042 }
ac27a0ec
DK		 4043#ifdef CONFIG_QUOTA
4044 for (i = 0; i < MAXQUOTAS; i++)
4045 kfree(sbi->s_qf_names[i]);
4046#endif
617ba13b 4047 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4048 brelse(bh);
4049out_fail:
4050 sb->s_fs_info = NULL;
f6830165 4051 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4052 kfree(sbi);
dcc7dae3 4053out_free_orig:
d4c402d9 4054 kfree(orig_data);
1d1fe1ee 4055 return ret;
ac27a0ec
DK		 4056}
4057
4058/*
4059 * Setup any per-fs journal parameters now. We'll do this both on
4060 * initial mount, once the journal has been initialised but before we've
4061 * done any recovery; and again on any subsequent remount.
4062 */
617ba13b 4063static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4064{
617ba13b 4065 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4066
30773840
TT		 4067 journal->j_commit_interval = sbi->s_commit_interval;
4068 journal->j_min_batch_time = sbi->s_min_batch_time;
4069 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4070
a931da6a 4071 write_lock(&journal->j_state_lock);
ac27a0ec 4072 if (test_opt(sb, BARRIER))
dab291af 4073 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4074 else
dab291af 4075 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4076 if (test_opt(sb, DATA_ERR_ABORT))
4077 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4078 else
4079 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4080 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4081}
4082
617ba13b 4083static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4084 unsigned int journal_inum)
4085{
4086 struct inode *journal_inode;
4087 journal_t *journal;
4088
0390131b
FM		 4089 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4090
ac27a0ec
DK		 4091 /* First, test for the existence of a valid inode on disk. Bad
4092 * things happen if we iget() an unused inode, as the subsequent
4093 * iput() will try to delete it. */
4094
1d1fe1ee
DH		 4095 journal_inode = ext4_iget(sb, journal_inum);
4096 if (IS_ERR(journal_inode)) {
b31e1552 4097 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4098 return NULL;
4099 }
4100 if (!journal_inode->i_nlink) {
4101 make_bad_inode(journal_inode);
4102 iput(journal_inode);
b31e1552 4103 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4104 return NULL;
4105 }
4106
e5f8eab8 4107 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4108 journal_inode, journal_inode->i_size);
1d1fe1ee 4109 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4110 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4111 iput(journal_inode);
4112 return NULL;
4113 }
4114
dab291af 4115 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4116 if (!journal) {
b31e1552 4117 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4118 iput(journal_inode);
4119 return NULL;
4120 }
4121 journal->j_private = sb;
617ba13b 4122 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4123 return journal;
4124}
4125
617ba13b 4126static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4127 dev_t j_dev)
4128{
2b2d6d01 4129 struct buffer_head *bh;
ac27a0ec 4130 journal_t *journal;
617ba13b
MC		 4131 ext4_fsblk_t start;
4132 ext4_fsblk_t len;
ac27a0ec 4133 int hblock, blocksize;
617ba13b 4134 ext4_fsblk_t sb_block;
ac27a0ec 4135 unsigned long offset;
2b2d6d01 4136 struct ext4_super_block *es;
ac27a0ec
DK		 4137 struct block_device *bdev;
4138
0390131b
FM		 4139 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4140
b31e1552 4141 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4142 if (bdev == NULL)
4143 return NULL;
4144
ac27a0ec 4145 blocksize = sb->s_blocksize;
e1defc4f 4146 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4147 if (blocksize < hblock) {
b31e1552
ES		 4148 ext4_msg(sb, KERN_ERR,
4149 "blocksize too small for journal device");
ac27a0ec
DK		 4150 goto out_bdev;
4151 }
4152
617ba13b
MC		 4153 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4154 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4155 set_blocksize(bdev, blocksize);
4156 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4157 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4158 "external journal");
ac27a0ec
DK		 4159 goto out_bdev;
4160 }
4161
2716b802 4162 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4163 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4164 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4165 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4166 ext4_msg(sb, KERN_ERR, "external journal has "
4167 "bad superblock");
ac27a0ec
DK		 4168 brelse(bh);
4169 goto out_bdev;
4170 }
4171
617ba13b 4172 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4173 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4174 brelse(bh);
4175 goto out_bdev;
4176 }
4177
bd81d8ee 4178 len = ext4_blocks_count(es);
ac27a0ec
DK		 4179 start = sb_block + 1;
4180 brelse(bh); /* we're done with the superblock */
4181
dab291af 4182 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4183 start, len, blocksize);
4184 if (!journal) {
b31e1552 4185 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4186 goto out_bdev;
4187 }
4188 journal->j_private = sb;
4189 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4190 wait_on_buffer(journal->j_sb_buffer);
4191 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4192 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4193 goto out_journal;
4194 }
4195 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4196 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4197 "user (unsupported) - %d",
ac27a0ec
DK		 4198 be32_to_cpu(journal->j_superblock->s_nr_users));
4199 goto out_journal;
4200 }
617ba13b
MC		 4201 EXT4_SB(sb)->journal_bdev = bdev;
4202 ext4_init_journal_params(sb, journal);
ac27a0ec 4203 return journal;
0b8e58a1 4204
ac27a0ec 4205out_journal:
dab291af 4206 jbd2_journal_destroy(journal);
ac27a0ec 4207out_bdev:
617ba13b 4208 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4209 return NULL;
4210}
4211
617ba13b
MC		 4212static int ext4_load_journal(struct super_block *sb,
4213 struct ext4_super_block *es,
ac27a0ec
DK		 4214 unsigned long journal_devnum)
4215{
4216 journal_t *journal;
4217 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4218 dev_t journal_dev;
4219 int err = 0;
4220 int really_read_only;
4221
0390131b
FM		 4222 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4223
ac27a0ec
DK		 4224 if (journal_devnum &&
4225 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4226 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4227 "numbers have changed");
ac27a0ec
DK		 4228 journal_dev = new_decode_dev(journal_devnum);
4229 } else
4230 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4231
4232 really_read_only = bdev_read_only(sb->s_bdev);
4233
4234 /*
4235 * Are we loading a blank journal or performing recovery after a
4236 * crash? For recovery, we need to check in advance whether we
4237 * can get read-write access to the device.
4238 */
617ba13b 4239 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4240 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4241 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4242 "required on readonly filesystem");
ac27a0ec 4243 if (really_read_only) {
b31e1552
ES		 4244 ext4_msg(sb, KERN_ERR, "write access "
4245 "unavailable, cannot proceed");
ac27a0ec
DK		 4246 return -EROFS;
4247 }
b31e1552
ES		 4248 ext4_msg(sb, KERN_INFO, "write access will "
4249 "be enabled during recovery");
ac27a0ec
DK		 4250 }
4251 }
4252
4253 if (journal_inum && journal_dev) {
b31e1552
ES		 4254 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4255 "and inode journals!");
ac27a0ec
DK		 4256 return -EINVAL;
4257 }
4258
4259 if (journal_inum) {
617ba13b 4260 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4261 return -EINVAL;
4262 } else {
617ba13b 4263 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4264 return -EINVAL;
4265 }
4266
90576c0b 4267 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4268 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4269
617ba13b 4270 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4271 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4272 if (!err) {
4273 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4274 if (save)
4275 memcpy(save, ((char *) es) +
4276 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4277 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4278 if (save)
4279 memcpy(((char *) es) + EXT4_S_ERR_START,
4280 save, EXT4_S_ERR_LEN);
4281 kfree(save);
4282 }
ac27a0ec
DK		 4283
4284 if (err) {
b31e1552 4285 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4286 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4287 return err;
4288 }
4289
617ba13b
MC		 4290 EXT4_SB(sb)->s_journal = journal;
4291 ext4_clear_journal_err(sb, es);
ac27a0ec 4292
c41303ce 4293 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4294 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4295 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4296
4297 /* Make sure we flush the recovery flag to disk. */
e2d67052 4298 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4299 }
4300
4301 return 0;
4302}
4303
e2d67052 4304static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4305{
e2d67052 4306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4307 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4308 int error = 0;
ac27a0ec 4309
7c2e7087 4310 if (!sbh || block_device_ejected(sb))
c4be0c1d 4311 return error;
914258bf
TT		 4312 if (buffer_write_io_error(sbh)) {
4313 /*
4314 * Oh, dear. A previous attempt to write the
4315 * superblock failed. This could happen because the
4316 * USB device was yanked out. Or it could happen to
4317 * be a transient write error and maybe the block will
4318 * be remapped. Nothing we can do but to retry the
4319 * write and hope for the best.
4320 */
b31e1552
ES		 4321 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4322 "superblock detected");
914258bf
TT		 4323 clear_buffer_write_io_error(sbh);
4324 set_buffer_uptodate(sbh);
4325 }
71290b36
TT		 4326 /*
4327 * If the file system is mounted read-only, don't update the
4328 * superblock write time. This avoids updating the superblock
4329 * write time when we are mounting the root file system
4330 * read/only but we need to replay the journal; at that point,
4331 * for people who are east of GMT and who make their clock
4332 * tick in localtime for Windows bug-for-bug compatibility,
4333 * the clock is set in the future, and this will cause e2fsck
4334 * to complain and force a full file system check.
4335 */
4336 if (!(sb->s_flags & MS_RDONLY))
4337 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4338 if (sb->s_bdev->bd_part)
4339 es->s_kbytes_written =
4340 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4341 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4342 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4343 else
4344 es->s_kbytes_written =
4345 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4346 ext4_free_blocks_count_set(es,
4347 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4348 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4349 es->s_free_inodes_count =
4350 cpu_to_le32(percpu_counter_sum_positive(
4351 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4352 BUFFER_TRACE(sbh, "marking dirty");
a9c47317 4353 ext4_superblock_csum_set(sb, es);
ac27a0ec 4354 mark_buffer_dirty(sbh);
914258bf 4355 if (sync) {
c4be0c1d
TS		 4356 error = sync_dirty_buffer(sbh);
4357 if (error)
4358 return error;
4359
4360 error = buffer_write_io_error(sbh);
4361 if (error) {
b31e1552
ES		 4362 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4363 "superblock");
914258bf
TT		 4364 clear_buffer_write_io_error(sbh);
4365 set_buffer_uptodate(sbh);
4366 }
4367 }
c4be0c1d 4368 return error;
ac27a0ec
DK		 4369}
4370
ac27a0ec
DK		 4371/*
4372 * Have we just finished recovery? If so, and if we are mounting (or
4373 * remounting) the filesystem readonly, then we will end up with a
4374 * consistent fs on disk. Record that fact.
4375 */
2b2d6d01
TT		 4376static void ext4_mark_recovery_complete(struct super_block *sb,
4377 struct ext4_super_block *es)
ac27a0ec 4378{
617ba13b 4379 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4380
0390131b
FM		 4381 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4382 BUG_ON(journal != NULL);
4383 return;
4384 }
dab291af 4385 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4386 if (jbd2_journal_flush(journal) < 0)
4387 goto out;
4388
617ba13b 4389 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4390 sb->s_flags & MS_RDONLY) {
617ba13b 4391 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4392 ext4_commit_super(sb, 1);
ac27a0ec 4393 }
7ffe1ea8
HK		 4394
4395out:
dab291af 4396 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4397}
4398
4399/*
4400 * If we are mounting (or read-write remounting) a filesystem whose journal
4401 * has recorded an error from a previous lifetime, move that error to the
4402 * main filesystem now.
4403 */
2b2d6d01
TT		 4404static void ext4_clear_journal_err(struct super_block *sb,
4405 struct ext4_super_block *es)
ac27a0ec
DK		 4406{
4407 journal_t *journal;
4408 int j_errno;
4409 const char *errstr;
4410
0390131b
FM		 4411 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4412
617ba13b 4413 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4414
4415 /*
4416 * Now check for any error status which may have been recorded in the
617ba13b 4417 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4418 */
4419
dab291af 4420 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4421 if (j_errno) {
4422 char nbuf[16];
4423
617ba13b 4424 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4425 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4426 "from previous mount: %s", errstr);
12062ddd 4427 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4428
617ba13b
MC		 4429 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4430 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4431 ext4_commit_super(sb, 1);
ac27a0ec 4432
dab291af 4433 jbd2_journal_clear_err(journal);
d796c52e 4434 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4435 }
4436}
4437
4438/*
4439 * Force the running and committing transactions to commit,
4440 * and wait on the commit.
4441 */
617ba13b 4442int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4443{
4444 journal_t *journal;
0390131b 4445 int ret = 0;
ac27a0ec
DK		 4446
4447 if (sb->s_flags & MS_RDONLY)
4448 return 0;
4449
617ba13b 4450 journal = EXT4_SB(sb)->s_journal;
8e8ad8a5 4451 if (journal)
0390131b 4452 ret = ext4_journal_force_commit(journal);
0390131b 4453
ac27a0ec
DK		 4454 return ret;
4455}
4456
617ba13b 4457static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4458{
14ce0cb4 4459 int ret = 0;
9eddacf9 4460 tid_t target;
8d5d02e6 4461 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4462
9bffad1e 4463 trace_ext4_sync_fs(sb, wait);
8d5d02e6 4464 flush_workqueue(sbi->dio_unwritten_wq);
a1177825
JK		 4465 /*
4466 * Writeback quota in non-journalled quota case - journalled quota has
4467 * no dirty dquots
4468 */
4469 dquot_writeback_dquots(sb, -1);
8d5d02e6 4470 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4471 if (wait)
8d5d02e6 4472 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4473 }
14ce0cb4 4474 return ret;
ac27a0ec
DK		 4475}
4476
4477/*
4478 * LVM calls this function before a (read-only) snapshot is created. This
4479 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4480 *
4481 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4482 * state independently. It relies on upper layer to stop all data & metadata
4483 * modifications.
ac27a0ec 4484 */
c4be0c1d 4485static int ext4_freeze(struct super_block *sb)
ac27a0ec 4486{
c4be0c1d
TS		 4487 int error = 0;
4488 journal_t *journal;
ac27a0ec 4489
9ca92389
TT		 4490 if (sb->s_flags & MS_RDONLY)
4491 return 0;
ac27a0ec 4492
9ca92389 4493 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4494
9ca92389
TT		 4495 /* Now we set up the journal barrier. */
4496 jbd2_journal_lock_updates(journal);
ac27a0ec 4497
9ca92389
TT		 4498 /*
4499 * Don't clear the needs_recovery flag if we failed to flush
4500 * the journal.
4501 */
4502 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4503 if (error < 0)
4504 goto out;
9ca92389
TT		 4505
4506 /* Journal blocked and flushed, clear needs_recovery flag. */
4507 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4508 error = ext4_commit_super(sb, 1);
6b0310fb 4509out:
8e8ad8a5 4510 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4511 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4512 return error;
ac27a0ec
DK		 4513}
4514
4515/*
4516 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4517 * flag here, even though the filesystem is not technically dirty yet.
4518 */
c4be0c1d 4519static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4520{
9ca92389
TT		 4521 if (sb->s_flags & MS_RDONLY)
4522 return 0;
4523
4524 lock_super(sb);
4525 /* Reset the needs_recovery flag before the fs is unlocked. */
4526 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4527 ext4_commit_super(sb, 1);
4528 unlock_super(sb);
c4be0c1d 4529 return 0;
ac27a0ec
DK		 4530}
4531
673c6100
TT		 4532/*
4533 * Structure to save mount options for ext4_remount's benefit
4534 */
4535struct ext4_mount_options {
4536 unsigned long s_mount_opt;
a2595b8a 4537 unsigned long s_mount_opt2;
08cefc7a
EB		 4538 kuid_t s_resuid;
4539 kgid_t s_resgid;
673c6100
TT		 4540 unsigned long s_commit_interval;
4541 u32 s_min_batch_time, s_max_batch_time;
4542#ifdef CONFIG_QUOTA
4543 int s_jquota_fmt;
4544 char *s_qf_names[MAXQUOTAS];
4545#endif
4546};
4547
2b2d6d01 4548static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4549{
2b2d6d01 4550 struct ext4_super_block *es;
617ba13b 4551 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4552 unsigned long old_sb_flags;
617ba13b 4553 struct ext4_mount_options old_opts;
c79d967d 4554 int enable_quota = 0;
8a266467 4555 ext4_group_t g;
b3881f74 4556 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4557 int err = 0;
ac27a0ec
DK		 4558#ifdef CONFIG_QUOTA
4559 int i;
4560#endif
d4c402d9 4561 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4562
4563 /* Store the original options */
bbd6851a 4564 lock_super(sb);
ac27a0ec
DK		 4565 old_sb_flags = sb->s_flags;
4566 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4567 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4568 old_opts.s_resuid = sbi->s_resuid;
4569 old_opts.s_resgid = sbi->s_resgid;
4570 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4571 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4572 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4573#ifdef CONFIG_QUOTA
4574 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4575 for (i = 0; i < MAXQUOTAS; i++)
4576 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4577#endif
b3881f74
TT		 4578 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4579 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4580
4581 /*
4582 * Allow the "check" option to be passed as a remount option.
4583 */
661aa520 4584 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4585 err = -EINVAL;
4586 goto restore_opts;
4587 }
4588
4ab2f15b 4589 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4590 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4591
4592 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4593 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4594
4595 es = sbi->s_es;
4596
b3881f74 4597 if (sbi->s_journal) {
0390131b 4598 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4599 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4600 }
ac27a0ec 4601
661aa520 4602 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4603 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4604 err = -EROFS;
4605 goto restore_opts;
4606 }
4607
4608 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4609 err = dquot_suspend(sb, -1);
4610 if (err < 0)
c79d967d 4611 goto restore_opts;
c79d967d 4612
ac27a0ec
DK		 4613 /*
4614 * First of all, the unconditional stuff we have to do
4615 * to disable replay of the journal when we next remount
4616 */
4617 sb->s_flags |= MS_RDONLY;
4618
4619 /*
4620 * OK, test if we are remounting a valid rw partition
4621 * readonly, and if so set the rdonly flag and then
4622 * mark the partition as valid again.
4623 */
617ba13b
MC		 4624 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4625 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4626 es->s_state = cpu_to_le16(sbi->s_mount_state);
4627
a63c9eb2 4628 if (sbi->s_journal)
0390131b 4629 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4630 } else {
a13fb1a4
ES		 4631 /* Make sure we can mount this feature set readwrite */
4632 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4633 err = -EROFS;
4634 goto restore_opts;
4635 }
8a266467
TT		 4636 /*
4637 * Make sure the group descriptor checksums
0b8e58a1 4638 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4639 */
4640 for (g = 0; g < sbi->s_groups_count; g++) {
4641 struct ext4_group_desc *gdp =
4642 ext4_get_group_desc(sb, g, NULL);
4643
feb0ab32 4644 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4645 ext4_msg(sb, KERN_ERR,
4646 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4647 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4648 le16_to_cpu(gdp->bg_checksum));
4649 err = -EINVAL;
4650 goto restore_opts;
4651 }
4652 }
4653
ead6596b
ES		 4654 /*
4655 * If we have an unprocessed orphan list hanging
4656 * around from a previously readonly bdev mount,
4657 * require a full umount/remount for now.
4658 */
4659 if (es->s_last_orphan) {
b31e1552 4660 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4661 "remount RDWR because of unprocessed "
4662 "orphan inode list. Please "
b31e1552 4663 "umount/remount instead");
ead6596b
ES		 4664 err = -EINVAL;
4665 goto restore_opts;
4666 }
4667
ac27a0ec
DK		 4668 /*
4669 * Mounting a RDONLY partition read-write, so reread
4670 * and store the current valid flag. (It may have
4671 * been changed by e2fsck since we originally mounted
4672 * the partition.)
4673 */
0390131b
FM		 4674 if (sbi->s_journal)
4675 ext4_clear_journal_err(sb, es);
ac27a0ec 4676 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4677 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4678 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4679 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4680 EXT4_FEATURE_INCOMPAT_MMP))
4681 if (ext4_multi_mount_protect(sb,
4682 le64_to_cpu(es->s_mmp_block))) {
4683 err = -EROFS;
4684 goto restore_opts;
4685 }
c79d967d 4686 enable_quota = 1;
ac27a0ec
DK		 4687 }
4688 }
bfff6873
LC		 4689
4690 /*
4691 * Reinitialize lazy itable initialization thread based on
4692 * current settings
4693 */
4694 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4695 ext4_unregister_li_request(sb);
4696 else {
4697 ext4_group_t first_not_zeroed;
4698 first_not_zeroed = ext4_has_uninit_itable(sb);
4699 ext4_register_li_request(sb, first_not_zeroed);
4700 }
4701
6fd058f7 4702 ext4_setup_system_zone(sb);
0390131b 4703 if (sbi->s_journal == NULL)
e2d67052 4704 ext4_commit_super(sb, 1);
0390131b 4705
7c319d32 4706 unlock_super(sb);
ac27a0ec
DK		 4707#ifdef CONFIG_QUOTA
4708 /* Release old quota file names */
4709 for (i = 0; i < MAXQUOTAS; i++)
4710 if (old_opts.s_qf_names[i] &&
4711 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4712 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4713 if (enable_quota) {
4714 if (sb_any_quota_suspended(sb))
4715 dquot_resume(sb, -1);
4716 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4717 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4718 err = ext4_enable_quotas(sb);
4719 if (err) {
4720 lock_super(sb);
4721 goto restore_opts;
4722 }
4723 }
4724 }
ac27a0ec 4725#endif
d4c402d9
CW		 4726
4727 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4728 kfree(orig_data);
ac27a0ec 4729 return 0;
0b8e58a1 4730
ac27a0ec
DK		 4731restore_opts:
4732 sb->s_flags = old_sb_flags;
4733 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4734 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4735 sbi->s_resuid = old_opts.s_resuid;
4736 sbi->s_resgid = old_opts.s_resgid;
4737 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4738 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4739 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4740#ifdef CONFIG_QUOTA
4741 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4742 for (i = 0; i < MAXQUOTAS; i++) {
4743 if (sbi->s_qf_names[i] &&
4744 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4745 kfree(sbi->s_qf_names[i]);
4746 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4747 }
4748#endif
bbd6851a 4749 unlock_super(sb);
d4c402d9 4750 kfree(orig_data);
ac27a0ec
DK		 4751 return err;
4752}
4753
2b2d6d01 4754static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4755{
4756 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4757 struct ext4_sb_info *sbi = EXT4_SB(sb);
4758 struct ext4_super_block *es = sbi->s_es;
952fc18e 4759 ext4_fsblk_t overhead = 0;
960cc398 4760 u64 fsid;
d02a9391 4761 s64 bfree;
ac27a0ec 4762
952fc18e
TT		 4763 if (!test_opt(sb, MINIX_DF))
4764 overhead = sbi->s_overhead;
ac27a0ec 4765
617ba13b 4766 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4767 buf->f_bsize = sb->s_blocksize;
952fc18e 4768 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
57042651
TT		 4769 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4770 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4771 /* prevent underflow in case that few free space is available */
57042651 4772 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4773 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4774 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4775 buf->f_bavail = 0;
4776 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4777 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4778 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4779 fsid = le64_to_cpup((void *)es->s_uuid) ^
4780 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4781 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4782 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4783
ac27a0ec
DK		 4784 return 0;
4785}
4786
0b8e58a1
AD		 4787/* Helper function for writing quotas on sync - we need to start transaction
4788 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4789 * Process 1 Process 2
617ba13b 4790 * ext4_create() quota_sync()
a269eb18 4791 * jbd2_journal_start() write_dquot()
871a2931 4792 * dquot_initialize() down(dqio_mutex)
dab291af 4793 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4794 *
4795 */
4796
4797#ifdef CONFIG_QUOTA
4798
4799static inline struct inode *dquot_to_inode(struct dquot *dquot)
4800{
4801 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4802}
4803
617ba13b 4804static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4805{
4806 int ret, err;
4807 handle_t *handle;
4808 struct inode *inode;
4809
4810 inode = dquot_to_inode(dquot);
617ba13b 4811 handle = ext4_journal_start(inode,
0b8e58a1 4812 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4813 if (IS_ERR(handle))
4814 return PTR_ERR(handle);
4815 ret = dquot_commit(dquot);
617ba13b 4816 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4817 if (!ret)
4818 ret = err;
4819 return ret;
4820}
4821
617ba13b 4822static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4823{
4824 int ret, err;
4825 handle_t *handle;
4826
617ba13b 4827 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4828 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4829 if (IS_ERR(handle))
4830 return PTR_ERR(handle);
4831 ret = dquot_acquire(dquot);
617ba13b 4832 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4833 if (!ret)
4834 ret = err;
4835 return ret;
4836}
4837
617ba13b 4838static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4839{
4840 int ret, err;
4841 handle_t *handle;
4842
617ba13b 4843 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4844 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4845 if (IS_ERR(handle)) {
4846 /* Release dquot anyway to avoid endless cycle in dqput() */
4847 dquot_release(dquot);
ac27a0ec 4848 return PTR_ERR(handle);
9c3013e9 4849 }
ac27a0ec 4850 ret = dquot_release(dquot);
617ba13b 4851 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4852 if (!ret)
4853 ret = err;
4854 return ret;
4855}
4856
617ba13b 4857static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4858{
2c8be6b2 4859 /* Are we journaling quotas? */
617ba13b
MC		 4860 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4861 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4862 dquot_mark_dquot_dirty(dquot);
617ba13b 4863 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4864 } else {
4865 return dquot_mark_dquot_dirty(dquot);
4866 }
4867}
4868
617ba13b 4869static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4870{
4871 int ret, err;
4872 handle_t *handle;
4873
4874 /* Data block + inode block */
617ba13b 4875 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4876 if (IS_ERR(handle))
4877 return PTR_ERR(handle);
4878 ret = dquot_commit_info(sb, type);
617ba13b 4879 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4880 if (!ret)
4881 ret = err;
4882 return ret;
4883}
4884
4885/*
4886 * Turn on quotas during mount time - we need to find
4887 * the quota file and such...
4888 */
617ba13b 4889static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4890{
287a8095
CH		 4891 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4892 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4893}
4894
4895/*
4896 * Standard function to be called on quota_on
4897 */
617ba13b 4898static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4899 struct path *path)
ac27a0ec
DK		 4900{
4901 int err;
ac27a0ec
DK		 4902
4903 if (!test_opt(sb, QUOTA))
4904 return -EINVAL;
0623543b 4905
ac27a0ec 4906 /* Quotafile not on the same filesystem? */
d8c9584e 4907 if (path->dentry->d_sb != sb)
ac27a0ec 4908 return -EXDEV;
0623543b
JK		 4909 /* Journaling quota? */
4910 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4911 /* Quotafile not in fs root? */
f00c9e44 4912 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4913 ext4_msg(sb, KERN_WARNING,
4914 "Quota file not on filesystem root. "
4915 "Journaled quota will not work");
2b2d6d01 4916 }
0623543b
JK		 4917
4918 /*
4919 * When we journal data on quota file, we have to flush journal to see
4920 * all updates to the file when we bypass pagecache...
4921 */
0390131b 4922 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4923 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4924 /*
4925 * We don't need to lock updates but journal_flush() could
4926 * otherwise be livelocked...
4927 */
4928 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4929 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4930 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4931 if (err)
7ffe1ea8 4932 return err;
0623543b
JK		 4933 }
4934
f00c9e44 4935 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4936}
4937
7c319d32
AK		 4938static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4939 unsigned int flags)
4940{
4941 int err;
4942 struct inode *qf_inode;
4943 unsigned long qf_inums[MAXQUOTAS] = {
4944 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4945 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4946 };
4947
4948 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4949
4950 if (!qf_inums[type])
4951 return -EPERM;
4952
4953 qf_inode = ext4_iget(sb, qf_inums[type]);
4954 if (IS_ERR(qf_inode)) {
4955 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4956 return PTR_ERR(qf_inode);
4957 }
4958
4959 err = dquot_enable(qf_inode, type, format_id, flags);
4960 iput(qf_inode);
4961
4962 return err;
4963}
4964
4965/* Enable usage tracking for all quota types. */
4966static int ext4_enable_quotas(struct super_block *sb)
4967{
4968 int type, err = 0;
4969 unsigned long qf_inums[MAXQUOTAS] = {
4970 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4971 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4972 };
4973
4974 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
4975 for (type = 0; type < MAXQUOTAS; type++) {
4976 if (qf_inums[type]) {
4977 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
4978 DQUOT_USAGE_ENABLED);
4979 if (err) {
4980 ext4_warning(sb,
4981 "Failed to enable quota (type=%d) "
4982 "tracking. Please run e2fsck to fix.",
4983 type);
4984 return err;
4985 }
4986 }
4987 }
4988 return 0;
4989}
4990
4991/*
4992 * quota_on function that is used when QUOTA feature is set.
4993 */
4994static int ext4_quota_on_sysfile(struct super_block *sb, int type,
4995 int format_id)
4996{
4997 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
4998 return -EINVAL;
4999
5000 /*
5001 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5002 */
5003 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5004}
5005
ca0e05e4
DM		 5006static int ext4_quota_off(struct super_block *sb, int type)
5007{
21f97697
JK		 5008 struct inode *inode = sb_dqopt(sb)->files[type];
5009 handle_t *handle;
5010
87009d86
DM		 5011 /* Force all delayed allocation blocks to be allocated.
5012 * Caller already holds s_umount sem */
5013 if (test_opt(sb, DELALLOC))
ca0e05e4 5014 sync_filesystem(sb);
ca0e05e4 5015
0b268590
AG		 5016 if (!inode)
5017 goto out;
5018
21f97697
JK		 5019 /* Update modification times of quota files when userspace can
5020 * start looking at them */
5021 handle = ext4_journal_start(inode, 1);
5022 if (IS_ERR(handle))
5023 goto out;
5024 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5025 ext4_mark_inode_dirty(handle, inode);
5026 ext4_journal_stop(handle);
5027
5028out:
ca0e05e4
DM		 5029 return dquot_quota_off(sb, type);
5030}
5031
7c319d32
AK		 5032/*
5033 * quota_off function that is used when QUOTA feature is set.
5034 */
5035static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5036{
5037 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5038 return -EINVAL;
5039
5040 /* Disable only the limits. */
5041 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5042}
5043
ac27a0ec
DK		 5044/* Read data from quotafile - avoid pagecache and such because we cannot afford
5045 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5046 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5047 * we don't have to be afraid of races */
617ba13b 5048static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5049 size_t len, loff_t off)
5050{
5051 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5052 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5053 int err = 0;
5054 int offset = off & (sb->s_blocksize - 1);
5055 int tocopy;
5056 size_t toread;
5057 struct buffer_head *bh;
5058 loff_t i_size = i_size_read(inode);
5059
5060 if (off > i_size)
5061 return 0;
5062 if (off+len > i_size)
5063 len = i_size-off;
5064 toread = len;
5065 while (toread > 0) {
5066 tocopy = sb->s_blocksize - offset < toread ?
5067 sb->s_blocksize - offset : toread;
617ba13b 5068 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5069 if (err)
5070 return err;
5071 if (!bh) /* A hole? */
5072 memset(data, 0, tocopy);
5073 else
5074 memcpy(data, bh->b_data+offset, tocopy);
5075 brelse(bh);
5076 offset = 0;
5077 toread -= tocopy;
5078 data += tocopy;
5079 blk++;
5080 }
5081 return len;
5082}
5083
5084/* Write to quotafile (we know the transaction is already started and has
5085 * enough credits) */
617ba13b 5086static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5087 const char *data, size_t len, loff_t off)
5088{
5089 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5090 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5091 int err = 0;
5092 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5093 struct buffer_head *bh;
5094 handle_t *handle = journal_current_handle();
5095
0390131b 5096 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5097 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5098 " cancelled because transaction is not started",
9c3013e9
JK		 5099 (unsigned long long)off, (unsigned long long)len);
5100 return -EIO;
5101 }
67eeb568
DM		 5102 /*
5103 * Since we account only one data block in transaction credits,
5104 * then it is impossible to cross a block boundary.
5105 */
5106 if (sb->s_blocksize - offset < len) {
5107 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5108 " cancelled because not block aligned",
5109 (unsigned long long)off, (unsigned long long)len);
5110 return -EIO;
5111 }
5112
67eeb568
DM		 5113 bh = ext4_bread(handle, inode, blk, 1, &err);
5114 if (!bh)
5115 goto out;
62d2b5f2
JK		 5116 err = ext4_journal_get_write_access(handle, bh);
5117 if (err) {
5118 brelse(bh);
5119 goto out;
ac27a0ec 5120 }
67eeb568
DM		 5121 lock_buffer(bh);
5122 memcpy(bh->b_data+offset, data, len);
5123 flush_dcache_page(bh->b_page);
5124 unlock_buffer(bh);
62d2b5f2 5125 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5126 brelse(bh);
ac27a0ec 5127out:
0b7f7cef 5128 if (err)
ac27a0ec 5129 return err;
67eeb568
DM		 5130 if (inode->i_size < off + len) {
5131 i_size_write(inode, off + len);
617ba13b 5132 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5133 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5134 }
67eeb568 5135 return len;
ac27a0ec
DK		 5136}
5137
5138#endif
5139
152a0836
AV		 5140static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5141 const char *dev_name, void *data)
ac27a0ec 5142{
152a0836 5143 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5144}
5145
37f328eb 5146#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5147static inline void register_as_ext2(void)
5148{
5149 int err = register_filesystem(&ext2_fs_type);
5150 if (err)
5151 printk(KERN_WARNING
5152 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5153}
5154
5155static inline void unregister_as_ext2(void)
5156{
5157 unregister_filesystem(&ext2_fs_type);
5158}
2035e776
TT		 5159
5160static inline int ext2_feature_set_ok(struct super_block *sb)
5161{
5162 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5163 return 0;
5164 if (sb->s_flags & MS_RDONLY)
5165 return 1;
5166 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5167 return 0;
5168 return 1;
5169}
51b7e3c9 5170MODULE_ALIAS("ext2");
24b58424
TT		 5171#else
5172static inline void register_as_ext2(void) { }
5173static inline void unregister_as_ext2(void) { }
2035e776 5174static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5175#endif
5176
37f328eb 5177#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5178static inline void register_as_ext3(void)
5179{
5180 int err = register_filesystem(&ext3_fs_type);
5181 if (err)
5182 printk(KERN_WARNING
5183 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5184}
5185
5186static inline void unregister_as_ext3(void)
5187{
5188 unregister_filesystem(&ext3_fs_type);
5189}
2035e776
TT		 5190
5191static inline int ext3_feature_set_ok(struct super_block *sb)
5192{
5193 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5194 return 0;
5195 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5196 return 0;
5197 if (sb->s_flags & MS_RDONLY)
5198 return 1;
5199 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5200 return 0;
5201 return 1;
5202}
51b7e3c9 5203MODULE_ALIAS("ext3");
24b58424
TT		 5204#else
5205static inline void register_as_ext3(void) { }
5206static inline void unregister_as_ext3(void) { }
2035e776 5207static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5208#endif
5209
03010a33
TT		 5210static struct file_system_type ext4_fs_type = {
5211 .owner = THIS_MODULE,
5212 .name = "ext4",
152a0836 5213 .mount = ext4_mount,
03010a33
TT		 5214 .kill_sb = kill_block_super,
5215 .fs_flags = FS_REQUIRES_DEV,
5216};
5217
8f021222 5218static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5219{
5220 struct ext4_features *ef;
5221 int ret = -ENOMEM;
5222
5223 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5224 if (!ef)
5225 goto out;
5226
5227 ef->f_kobj.kset = ext4_kset;
5228 init_completion(&ef->f_kobj_unregister);
5229 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5230 "features");
5231 if (ret) {
5232 kfree(ef);
5233 goto out;
5234 }
5235
5236 ext4_feat = ef;
5237 ret = 0;
5238out:
5239 return ret;
5240}
5241
8f021222
LC		 5242static void ext4_exit_feat_adverts(void)
5243{
5244 kobject_put(&ext4_feat->f_kobj);
5245 wait_for_completion(&ext4_feat->f_kobj_unregister);
5246 kfree(ext4_feat);
5247}
5248
e9e3bcec
ES		 5249/* Shared across all ext4 file systems */
5250wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5251struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5252
5dabfc78 5253static int __init ext4_init_fs(void)
ac27a0ec 5254{
e9e3bcec 5255 int i, err;
c9de560d 5256
07c0c5d8
AV		 5257 ext4_li_info = NULL;
5258 mutex_init(&ext4_li_mtx);
5259
12e9b892 5260 ext4_check_flag_values();
e9e3bcec
ES		 5261
5262 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5263 mutex_init(&ext4__aio_mutex[i]);
5264 init_waitqueue_head(&ext4__ioend_wq[i]);
5265 }
5266
5dabfc78 5267 err = ext4_init_pageio();
6fd058f7
TT		 5268 if (err)
5269 return err;
5dabfc78 5270 err = ext4_init_system_zone();
bd2d0210 5271 if (err)
d44651d0 5272 goto out6;
3197ebdb
TT		 5273 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5274 if (!ext4_kset)
dd68314c 5275 goto out5;
d44651d0 5276 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5277
5278 err = ext4_init_feat_adverts();
dd68314c
TT		 5279 if (err)
5280 goto out4;
857ac889 5281
5dabfc78 5282 err = ext4_init_mballoc();
ac27a0ec 5283 if (err)
6fd058f7 5284 goto out3;
c9de560d 5285
5dabfc78 5286 err = ext4_init_xattr();
c9de560d
AT		 5287 if (err)
5288 goto out2;
ac27a0ec
DK		 5289 err = init_inodecache();
5290 if (err)
5291 goto out1;
24b58424 5292 register_as_ext3();
2035e776 5293 register_as_ext2();
03010a33 5294 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5295 if (err)
5296 goto out;
bfff6873 5297
ac27a0ec
DK		 5298 return 0;
5299out:
24b58424
TT		 5300 unregister_as_ext2();
5301 unregister_as_ext3();
ac27a0ec
DK		 5302 destroy_inodecache();
5303out1:
5dabfc78 5304 ext4_exit_xattr();
c9de560d 5305out2:
5dabfc78 5306 ext4_exit_mballoc();
6fd058f7 5307out3:
8f021222 5308 ext4_exit_feat_adverts();
dd68314c 5309out4:
d44651d0
FJ		 5310 if (ext4_proc_root)
5311 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5312 kset_unregister(ext4_kset);
d44651d0 5313out5:
5dabfc78 5314 ext4_exit_system_zone();
d44651d0 5315out6:
5dabfc78 5316 ext4_exit_pageio();
ac27a0ec
DK		 5317 return err;
5318}
5319
5dabfc78 5320static void __exit ext4_exit_fs(void)
ac27a0ec 5321{
bfff6873 5322 ext4_destroy_lazyinit_thread();
24b58424
TT		 5323 unregister_as_ext2();
5324 unregister_as_ext3();
03010a33 5325 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5326 destroy_inodecache();
5dabfc78
TT		 5327 ext4_exit_xattr();
5328 ext4_exit_mballoc();
8f021222 5329 ext4_exit_feat_adverts();
9f6200bb 5330 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5331 kset_unregister(ext4_kset);
5dabfc78
TT		 5332 ext4_exit_system_zone();
5333 ext4_exit_pageio();
ac27a0ec
DK		 5334}
5335
5336MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5337MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5338MODULE_LICENSE("GPL");
5dabfc78
TT		 5339module_init(ext4_init_fs)
5340module_exit(ext4_exit_fs)
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