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ext4: Fix off-by-one-error in ext4_valid_extent_idx()
[thirdparty/kernel/linux.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
dab291af 23#include <linux/jbd2.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
27#include <linux/parser.h>
28#include <linux/smp_lock.h>
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>
ede86cc4 39#include <linux/marker.h>
1330593e 40#include <linux/log2.h>
717d50e4 41#include <linux/crc16.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
3dcf5451
CH		 44#include "ext4.h"
45#include "ext4_jbd2.h"
ac27a0ec
DK		 46#include "xattr.h"
47#include "acl.h"
48#include "namei.h"
717d50e4 49#include "group.h"
ac27a0ec 50
9f6200bb 51struct proc_dir_entry *ext4_proc_root;
3197ebdb 52static struct kset *ext4_kset;
9f6200bb 53
617ba13b 54static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 55 unsigned long journal_devnum);
c4be0c1d 56static int ext4_commit_super(struct super_block *sb,
2b2d6d01
TT		 57 struct ext4_super_block *es, int sync);
58static void ext4_mark_recovery_complete(struct super_block *sb,
59 struct ext4_super_block *es);
60static void ext4_clear_journal_err(struct super_block *sb,
61 struct ext4_super_block *es);
617ba13b 62static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 63static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 64 char nbuf[16]);
2b2d6d01
TT		 65static int ext4_remount(struct super_block *sb, int *flags, char *data);
66static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 67static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 68static void ext4_write_super(struct super_block *sb);
c4be0c1d 69static int ext4_freeze(struct super_block *sb);
ac27a0ec 70
bd81d8ee 71
8fadc143
AR		 72ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
73 struct ext4_group_desc *bg)
bd81d8ee 74{
3a14589c 75 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 76 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 77 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 78}
79
8fadc143
AR		 80ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
81 struct ext4_group_desc *bg)
bd81d8ee 82{
5272f837 83 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 84 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 85 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 86}
87
8fadc143
AR		 88ext4_fsblk_t ext4_inode_table(struct super_block *sb,
89 struct ext4_group_desc *bg)
bd81d8ee 90{
5272f837 91 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 93 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 94}
95
560671a0
AK		 96__u32 ext4_free_blks_count(struct super_block *sb,
97 struct ext4_group_desc *bg)
98{
99 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
100 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
101 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
102}
103
104__u32 ext4_free_inodes_count(struct super_block *sb,
105 struct ext4_group_desc *bg)
106{
107 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
108 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
109 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
110}
111
112__u32 ext4_used_dirs_count(struct super_block *sb,
113 struct ext4_group_desc *bg)
114{
115 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
116 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
117 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
118}
119
120__u32 ext4_itable_unused_count(struct super_block *sb,
121 struct ext4_group_desc *bg)
122{
123 return le16_to_cpu(bg->bg_itable_unused_lo) |
124 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
125 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
126}
127
8fadc143
AR		 128void ext4_block_bitmap_set(struct super_block *sb,
129 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 130{
3a14589c 131 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 132 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
133 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 134}
135
8fadc143
AR		 136void ext4_inode_bitmap_set(struct super_block *sb,
137 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 138{
5272f837 139 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 140 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
141 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 142}
143
8fadc143
AR		 144void ext4_inode_table_set(struct super_block *sb,
145 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 146{
5272f837 147 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 148 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
149 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 150}
151
560671a0
AK		 152void ext4_free_blks_set(struct super_block *sb,
153 struct ext4_group_desc *bg, __u32 count)
154{
155 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
156 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
157 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
158}
159
160void ext4_free_inodes_set(struct super_block *sb,
161 struct ext4_group_desc *bg, __u32 count)
162{
163 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
164 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
165 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
166}
167
168void ext4_used_dirs_set(struct super_block *sb,
169 struct ext4_group_desc *bg, __u32 count)
170{
171 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
172 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
173 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
174}
175
176void ext4_itable_unused_set(struct super_block *sb,
177 struct ext4_group_desc *bg, __u32 count)
178{
179 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
180 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
181 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
182}
183
ac27a0ec 184/*
dab291af 185 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 186 *
187 * The only special thing we need to do here is to make sure that all
188 * journal_end calls result in the superblock being marked dirty, so
189 * that sync() will call the filesystem's write_super callback if
190 * appropriate.
191 */
617ba13b 192handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 193{
194 journal_t *journal;
195
196 if (sb->s_flags & MS_RDONLY)
197 return ERR_PTR(-EROFS);
198
199 /* Special case here: if the journal has aborted behind our
200 * backs (eg. EIO in the commit thread), then we still need to
201 * take the FS itself readonly cleanly. */
617ba13b 202 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 203 if (journal) {
204 if (is_journal_aborted(journal)) {
205 ext4_abort(sb, __func__,
206 "Detected aborted journal");
207 return ERR_PTR(-EROFS);
208 }
209 return jbd2_journal_start(journal, nblocks);
ac27a0ec 210 }
0390131b
FM		 211 /*
212 * We're not journaling, return the appropriate indication.
213 */
214 current->journal_info = EXT4_NOJOURNAL_HANDLE;
215 return current->journal_info;
ac27a0ec
DK		 216}
217
218/*
219 * The only special thing we need to do here is to make sure that all
dab291af 220 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 221 * that sync() will call the filesystem's write_super callback if
222 * appropriate.
223 */
617ba13b 224int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 225{
226 struct super_block *sb;
227 int err;
228 int rc;
229
0390131b
FM		 230 if (!ext4_handle_valid(handle)) {
231 /*
232 * Do this here since we don't call jbd2_journal_stop() in
233 * no-journal mode.
234 */
235 current->journal_info = NULL;
236 return 0;
237 }
ac27a0ec
DK		 238 sb = handle->h_transaction->t_journal->j_private;
239 err = handle->h_err;
dab291af 240 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 241
242 if (!err)
243 err = rc;
244 if (err)
617ba13b 245 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 246 return err;
247}
248
617ba13b 249void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 250 struct buffer_head *bh, handle_t *handle, int err)
251{
252 char nbuf[16];
617ba13b 253 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 254
0390131b
FM		 255 BUG_ON(!ext4_handle_valid(handle));
256
ac27a0ec
DK		 257 if (bh)
258 BUFFER_TRACE(bh, "abort");
259
260 if (!handle->h_err)
261 handle->h_err = err;
262
263 if (is_handle_aborted(handle))
264 return;
265
266 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
267 caller, errstr, err_fn);
268
dab291af 269 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 270}
271
272/* Deal with the reporting of failure conditions on a filesystem such as
273 * inconsistencies detected or read IO failures.
274 *
275 * On ext2, we can store the error state of the filesystem in the
617ba13b 276 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 277 * write ordering constraints on the superblock which prevent us from
278 * writing it out straight away; and given that the journal is about to
279 * be aborted, we can't rely on the current, or future, transactions to
280 * write out the superblock safely.
281 *
dab291af 282 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 283 * the journal instead. On recovery, the journal will compain about
284 * that error until we've noted it down and cleared it.
285 */
286
617ba13b 287static void ext4_handle_error(struct super_block *sb)
ac27a0ec 288{
617ba13b 289 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 290
617ba13b
MC		 291 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
292 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 293
294 if (sb->s_flags & MS_RDONLY)
295 return;
296
2b2d6d01 297 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 298 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 299
617ba13b 300 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 301 if (journal)
dab291af 302 jbd2_journal_abort(journal, -EIO);
ac27a0ec 303 }
2b2d6d01
TT		 304 if (test_opt(sb, ERRORS_RO)) {
305 printk(KERN_CRIT "Remounting filesystem read-only\n");
ac27a0ec
DK		 306 sb->s_flags |= MS_RDONLY;
307 }
617ba13b 308 ext4_commit_super(sb, es, 1);
ac27a0ec 309 if (test_opt(sb, ERRORS_PANIC))
617ba13b 310 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 311 sb->s_id);
312}
313
2b2d6d01
TT		 314void ext4_error(struct super_block *sb, const char *function,
315 const char *fmt, ...)
ac27a0ec
DK		 316{
317 va_list args;
318
319 va_start(args, fmt);
2b2d6d01 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
617ba13b 325 ext4_handle_error(sb);
ac27a0ec
DK		 326}
327
2b2d6d01 328static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 329 char nbuf[16])
330{
331 char *errstr = NULL;
332
333 switch (errno) {
334 case -EIO:
335 errstr = "IO failure";
336 break;
337 case -ENOMEM:
338 errstr = "Out of memory";
339 break;
340 case -EROFS:
dab291af 341 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 342 errstr = "Journal has aborted";
343 else
344 errstr = "Readonly filesystem";
345 break;
346 default:
347 /* If the caller passed in an extra buffer for unknown
348 * errors, textualise them now. Else we just return
349 * NULL. */
350 if (nbuf) {
351 /* Check for truncated error codes... */
352 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
353 errstr = nbuf;
354 }
355 break;
356 }
357
358 return errstr;
359}
360
617ba13b 361/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 362 * automatically and invokes the appropriate error response. */
363
2b2d6d01 364void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 365{
366 char nbuf[16];
367 const char *errstr;
368
369 /* Special case: if the error is EROFS, and we're not already
370 * inside a transaction, then there's really no point in logging
371 * an error. */
372 if (errno == -EROFS && journal_current_handle() == NULL &&
373 (sb->s_flags & MS_RDONLY))
374 return;
375
617ba13b 376 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 377 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
378 sb->s_id, function, errstr);
ac27a0ec 379
617ba13b 380 ext4_handle_error(sb);
ac27a0ec
DK		 381}
382
383/*
617ba13b 384 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 385 * abort function may be used to deal with unrecoverable failures such
386 * as journal IO errors or ENOMEM at a critical moment in log management.
387 *
388 * We unconditionally force the filesystem into an ABORT|READONLY state,
389 * unless the error response on the fs has been set to panic in which
390 * case we take the easy way out and panic immediately.
391 */
392
2b2d6d01
TT		 393void ext4_abort(struct super_block *sb, const char *function,
394 const char *fmt, ...)
ac27a0ec
DK		 395{
396 va_list args;
397
2b2d6d01 398 printk(KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 399
400 va_start(args, fmt);
2b2d6d01 401 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 402 vprintk(fmt, args);
403 printk("\n");
404 va_end(args);
405
406 if (test_opt(sb, ERRORS_PANIC))
617ba13b 407 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 408
409 if (sb->s_flags & MS_RDONLY)
410 return;
411
412 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 413 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 414 sb->s_flags |= MS_RDONLY;
617ba13b 415 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ef2cabf7
HK		 416 if (EXT4_SB(sb)->s_journal)
417 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 418}
419
2b2d6d01
TT		 420void ext4_warning(struct super_block *sb, const char *function,
421 const char *fmt, ...)
ac27a0ec
DK		 422{
423 va_list args;
424
425 va_start(args, fmt);
617ba13b 426 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 427 sb->s_id, function);
428 vprintk(fmt, args);
429 printk("\n");
430 va_end(args);
431}
432
5d1b1b3f
AK		 433void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
434 const char *function, const char *fmt, ...)
435__releases(bitlock)
436__acquires(bitlock)
437{
438 va_list args;
439 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
440
441 va_start(args, fmt);
442 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
443 vprintk(fmt, args);
444 printk("\n");
445 va_end(args);
446
447 if (test_opt(sb, ERRORS_CONT)) {
448 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
449 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
450 ext4_commit_super(sb, es, 0);
451 return;
452 }
453 ext4_unlock_group(sb, grp);
454 ext4_handle_error(sb);
455 /*
456 * We only get here in the ERRORS_RO case; relocking the group
457 * may be dangerous, but nothing bad will happen since the
458 * filesystem will have already been marked read/only and the
459 * journal has been aborted. We return 1 as a hint to callers
460 * who might what to use the return value from
461 * ext4_grp_locked_error() to distinguish beween the
462 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
463 * aggressively from the ext4 function in question, with a
464 * more appropriate error code.
465 */
466 ext4_lock_group(sb, grp);
467 return;
468}
469
470
617ba13b 471void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 472{
617ba13b 473 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 474
617ba13b 475 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 476 return;
477
46e665e9 478 ext4_warning(sb, __func__,
ac27a0ec
DK		 479 "updating to rev %d because of new feature flag, "
480 "running e2fsck is recommended",
617ba13b 481 EXT4_DYNAMIC_REV);
ac27a0ec 482
617ba13b
MC		 483 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
484 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
485 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 486 /* leave es->s_feature_*compat flags alone */
487 /* es->s_uuid will be set by e2fsck if empty */
488
489 /*
490 * The rest of the superblock fields should be zero, and if not it
491 * means they are likely already in use, so leave them alone. We
492 * can leave it up to e2fsck to clean up any inconsistencies there.
493 */
494}
495
496/*
497 * Open the external journal device
498 */
617ba13b 499static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 500{
501 struct block_device *bdev;
502 char b[BDEVNAME_SIZE];
503
504 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
505 if (IS_ERR(bdev))
506 goto fail;
507 return bdev;
508
509fail:
abda1418 510 printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 511 __bdevname(dev, b), PTR_ERR(bdev));
512 return NULL;
513}
514
515/*
516 * Release the journal device
517 */
617ba13b 518static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 519{
520 bd_release(bdev);
9a1c3542 521 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 522}
523
617ba13b 524static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 525{
526 struct block_device *bdev;
527 int ret = -ENODEV;
528
529 bdev = sbi->journal_bdev;
530 if (bdev) {
617ba13b 531 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 532 sbi->journal_bdev = NULL;
533 }
534 return ret;
535}
536
537static inline struct inode *orphan_list_entry(struct list_head *l)
538{
617ba13b 539 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 540}
541
617ba13b 542static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 543{
544 struct list_head *l;
545
546 printk(KERN_ERR "sb orphan head is %d\n",
547 le32_to_cpu(sbi->s_es->s_last_orphan));
548
549 printk(KERN_ERR "sb_info orphan list:\n");
550 list_for_each(l, &sbi->s_orphan) {
551 struct inode *inode = orphan_list_entry(l);
552 printk(KERN_ERR " "
553 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
554 inode->i_sb->s_id, inode->i_ino, inode,
555 inode->i_mode, inode->i_nlink,
556 NEXT_ORPHAN(inode));
557 }
558}
559
2b2d6d01 560static void ext4_put_super(struct super_block *sb)
ac27a0ec 561{
617ba13b
MC		 562 struct ext4_sb_info *sbi = EXT4_SB(sb);
563 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 564 int i, err;
ac27a0ec 565
c9de560d 566 ext4_mb_release(sb);
a86c6181 567 ext4_ext_release(sb);
617ba13b 568 ext4_xattr_put_super(sb);
0390131b
FM		 569 if (sbi->s_journal) {
570 err = jbd2_journal_destroy(sbi->s_journal);
571 sbi->s_journal = NULL;
572 if (err < 0)
573 ext4_abort(sb, __func__,
574 "Couldn't clean up the journal");
575 }
ac27a0ec 576 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 577 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 578 es->s_state = cpu_to_le16(sbi->s_mount_state);
617ba13b 579 ext4_commit_super(sb, es, 1);
ac27a0ec 580 }
240799cd 581 if (sbi->s_proc) {
9f6200bb 582 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 583 }
3197ebdb 584 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 585
586 for (i = 0; i < sbi->s_gdb_count; i++)
587 brelse(sbi->s_group_desc[i]);
588 kfree(sbi->s_group_desc);
772cb7c8 589 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 590 percpu_counter_destroy(&sbi->s_freeblocks_counter);
591 percpu_counter_destroy(&sbi->s_freeinodes_counter);
592 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 593 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 594 brelse(sbi->s_sbh);
595#ifdef CONFIG_QUOTA
596 for (i = 0; i < MAXQUOTAS; i++)
597 kfree(sbi->s_qf_names[i]);
598#endif
599
600 /* Debugging code just in case the in-memory inode orphan list
601 * isn't empty. The on-disk one can be non-empty if we've
602 * detected an error and taken the fs readonly, but the
603 * in-memory list had better be clean by this point. */
604 if (!list_empty(&sbi->s_orphan))
605 dump_orphan_list(sb, sbi);
606 J_ASSERT(list_empty(&sbi->s_orphan));
607
f98393a6 608 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 609 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
610 /*
611 * Invalidate the journal device's buffers. We don't want them
612 * floating about in memory - the physical journal device may
613 * hotswapped, and it breaks the `ro-after' testing code.
614 */
615 sync_blockdev(sbi->journal_bdev);
f98393a6 616 invalidate_bdev(sbi->journal_bdev);
617ba13b 617 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 618 }
619 sb->s_fs_info = NULL;
3197ebdb
TT		 620 /*
621 * Now that we are completely done shutting down the
622 * superblock, we need to actually destroy the kobject.
623 */
624 unlock_kernel();
625 unlock_super(sb);
626 kobject_put(&sbi->s_kobj);
627 wait_for_completion(&sbi->s_kobj_unregister);
628 lock_super(sb);
629 lock_kernel();
705895b6 630 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 631 kfree(sbi);
632 return;
633}
634
e18b890b 635static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 636
637/*
638 * Called inside transaction, so use GFP_NOFS
639 */
617ba13b 640static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 641{
617ba13b 642 struct ext4_inode_info *ei;
ac27a0ec 643
e6b4f8da 644 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 645 if (!ei)
646 return NULL;
03010a33 647#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 648 ei->i_acl = EXT4_ACL_NOT_CACHED;
649 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec 650#endif
ac27a0ec 651 ei->vfs_inode.i_version = 1;
91246c00 652 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 653 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 654 INIT_LIST_HEAD(&ei->i_prealloc_list);
655 spin_lock_init(&ei->i_prealloc_lock);
0390131b
FM		 656 /*
657 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
658 * therefore it can be null here. Don't check it, just initialize
659 * jinode.
660 */
678aaf48 661 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 662 ei->i_reserved_data_blocks = 0;
663 ei->i_reserved_meta_blocks = 0;
664 ei->i_allocated_meta_blocks = 0;
665 ei->i_delalloc_reserved_flag = 0;
666 spin_lock_init(&(ei->i_block_reservation_lock));
ac27a0ec
DK		 667 return &ei->vfs_inode;
668}
669
617ba13b 670static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 671{
9f7dd93d
VA		 672 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
673 printk("EXT4 Inode %p: orphan list check failed!\n",
674 EXT4_I(inode));
675 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
676 EXT4_I(inode), sizeof(struct ext4_inode_info),
677 true);
678 dump_stack();
679 }
617ba13b 680 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 681}
682
51cc5068 683static void init_once(void *foo)
ac27a0ec 684{
617ba13b 685 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 686
a35afb83 687 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 688#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 689 init_rwsem(&ei->xattr_sem);
ac27a0ec 690#endif
0e855ac8 691 init_rwsem(&ei->i_data_sem);
a35afb83 692 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 693}
694
695static int init_inodecache(void)
696{
617ba13b
MC		 697 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
698 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 699 0, (SLAB_RECLAIM_ACCOUNT|
700 SLAB_MEM_SPREAD),
20c2df83 701 init_once);
617ba13b 702 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 703 return -ENOMEM;
704 return 0;
705}
706
707static void destroy_inodecache(void)
708{
617ba13b 709 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 710}
711
617ba13b 712static void ext4_clear_inode(struct inode *inode)
ac27a0ec 713{
03010a33 714#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b
MC		 715 if (EXT4_I(inode)->i_acl &&
716 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
717 posix_acl_release(EXT4_I(inode)->i_acl);
718 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
719 }
720 if (EXT4_I(inode)->i_default_acl &&
721 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
722 posix_acl_release(EXT4_I(inode)->i_default_acl);
723 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 724 }
725#endif
c2ea3fde 726 ext4_discard_preallocations(inode);
0390131b
FM		 727 if (EXT4_JOURNAL(inode))
728 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 729 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 730}
731
2b2d6d01
TT		 732static inline void ext4_show_quota_options(struct seq_file *seq,
733 struct super_block *sb)
ac27a0ec
DK		 734{
735#if defined(CONFIG_QUOTA)
617ba13b 736 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 737
738 if (sbi->s_jquota_fmt)
739 seq_printf(seq, ",jqfmt=%s",
af5bc92d 740 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 741
742 if (sbi->s_qf_names[USRQUOTA])
743 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
744
745 if (sbi->s_qf_names[GRPQUOTA])
746 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
747
617ba13b 748 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 749 seq_puts(seq, ",usrquota");
750
617ba13b 751 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 752 seq_puts(seq, ",grpquota");
753#endif
754}
755
d9c9bef1
MS		 756/*
757 * Show an option if
758 * - it's set to a non-default value OR
759 * - if the per-sb default is different from the global default
760 */
617ba13b 761static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 762{
aa22df2c
AK		 763 int def_errors;
764 unsigned long def_mount_opts;
ac27a0ec 765 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 766 struct ext4_sb_info *sbi = EXT4_SB(sb);
767 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 768
769 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 770 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 771
772 if (sbi->s_sb_block != 1)
773 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
774 if (test_opt(sb, MINIX_DF))
775 seq_puts(seq, ",minixdf");
aa22df2c 776 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 777 seq_puts(seq, ",grpid");
778 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
779 seq_puts(seq, ",nogrpid");
780 if (sbi->s_resuid != EXT4_DEF_RESUID ||
781 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
782 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
783 }
784 if (sbi->s_resgid != EXT4_DEF_RESGID ||
785 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
786 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
787 }
bb4f397a 788 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 789 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 790 def_errors == EXT4_ERRORS_CONTINUE) {
791 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 792 }
793 }
aa22df2c 794 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 795 seq_puts(seq, ",errors=continue");
aa22df2c 796 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 797 seq_puts(seq, ",errors=panic");
aa22df2c 798 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 799 seq_puts(seq, ",nouid32");
aa22df2c 800 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 801 seq_puts(seq, ",debug");
802 if (test_opt(sb, OLDALLOC))
803 seq_puts(seq, ",oldalloc");
03010a33 804#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 805 if (test_opt(sb, XATTR_USER) &&
806 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 807 seq_puts(seq, ",user_xattr");
808 if (!test_opt(sb, XATTR_USER) &&
809 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
810 seq_puts(seq, ",nouser_xattr");
811 }
812#endif
03010a33 813#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 814 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 815 seq_puts(seq, ",acl");
816 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
817 seq_puts(seq, ",noacl");
818#endif
30773840 819 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 820 seq_printf(seq, ",commit=%u",
821 (unsigned) (sbi->s_commit_interval / HZ));
822 }
30773840
TT		 823 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
824 seq_printf(seq, ",min_batch_time=%u",
825 (unsigned) sbi->s_min_batch_time);
826 }
827 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
828 seq_printf(seq, ",max_batch_time=%u",
829 (unsigned) sbi->s_min_batch_time);
830 }
831
571640ca
ES		 832 /*
833 * We're changing the default of barrier mount option, so
834 * let's always display its mount state so it's clear what its
835 * status is.
836 */
837 seq_puts(seq, ",barrier=");
838 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 839 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
840 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 841 if (test_opt(sb, NOBH))
842 seq_puts(seq, ",nobh");
25ec56b5
JNC		 843 if (test_opt(sb, I_VERSION))
844 seq_puts(seq, ",i_version");
dd919b98
AK		 845 if (!test_opt(sb, DELALLOC))
846 seq_puts(seq, ",nodelalloc");
847
ac27a0ec 848
cb45bbe4
MS		 849 if (sbi->s_stripe)
850 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 851 /*
852 * journal mode get enabled in different ways
853 * So just print the value even if we didn't specify it
854 */
617ba13b 855 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 856 seq_puts(seq, ",data=journal");
617ba13b 857 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 858 seq_puts(seq, ",data=ordered");
617ba13b 859 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 860 seq_puts(seq, ",data=writeback");
861
240799cd
TT		 862 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
863 seq_printf(seq, ",inode_readahead_blks=%u",
864 sbi->s_inode_readahead_blks);
865
5bf5683a
HK		 866 if (test_opt(sb, DATA_ERR_ABORT))
867 seq_puts(seq, ",data_err=abort");
868
afd4672d 869 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 870 seq_puts(seq, ",noauto_da_alloc");
afd4672d 871
617ba13b 872 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 873 return 0;
874}
875
876
1b961ac0
CH		 877static struct inode *ext4_nfs_get_inode(struct super_block *sb,
878 u64 ino, u32 generation)
ac27a0ec 879{
ac27a0ec 880 struct inode *inode;
ac27a0ec 881
617ba13b 882 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 883 return ERR_PTR(-ESTALE);
617ba13b 884 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 885 return ERR_PTR(-ESTALE);
886
887 /* iget isn't really right if the inode is currently unallocated!!
888 *
617ba13b 889 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 890 * deleted, so we should be safe.
891 *
892 * Currently we don't know the generation for parent directory, so
893 * a generation of 0 means "accept any"
894 */
1d1fe1ee
DH		 895 inode = ext4_iget(sb, ino);
896 if (IS_ERR(inode))
897 return ERR_CAST(inode);
898 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 899 iput(inode);
900 return ERR_PTR(-ESTALE);
901 }
1b961ac0
CH		 902
903 return inode;
904}
905
906static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
907 int fh_len, int fh_type)
908{
909 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
910 ext4_nfs_get_inode);
911}
912
913static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
914 int fh_len, int fh_type)
915{
916 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
917 ext4_nfs_get_inode);
ac27a0ec
DK		 918}
919
c39a7f84
TO		 920/*
921 * Try to release metadata pages (indirect blocks, directories) which are
922 * mapped via the block device. Since these pages could have journal heads
923 * which would prevent try_to_free_buffers() from freeing them, we must use
924 * jbd2 layer's try_to_free_buffers() function to release them.
925 */
926static int bdev_try_to_free_page(struct super_block *sb, struct page *page, gfp_t wait)
927{
928 journal_t *journal = EXT4_SB(sb)->s_journal;
929
930 WARN_ON(PageChecked(page));
931 if (!page_has_buffers(page))
932 return 0;
933 if (journal)
934 return jbd2_journal_try_to_free_buffers(journal, page,
935 wait & ~__GFP_WAIT);
936 return try_to_free_buffers(page);
937}
938
ac27a0ec 939#ifdef CONFIG_QUOTA
af5bc92d 940#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 941#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 942
617ba13b
MC		 943static int ext4_write_dquot(struct dquot *dquot);
944static int ext4_acquire_dquot(struct dquot *dquot);
945static int ext4_release_dquot(struct dquot *dquot);
946static int ext4_mark_dquot_dirty(struct dquot *dquot);
947static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 948static int ext4_quota_on(struct super_block *sb, int type, int format_id,
949 char *path, int remount);
617ba13b
MC		 950static int ext4_quota_on_mount(struct super_block *sb, int type);
951static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 952 size_t len, loff_t off);
617ba13b 953static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 954 const char *data, size_t len, loff_t off);
955
617ba13b 956static struct dquot_operations ext4_quota_operations = {
edf72453
JK		 957 .initialize = dquot_initialize,
958 .drop = dquot_drop,
ac27a0ec 959 .alloc_space = dquot_alloc_space,
60e58e0f
MC		 960 .reserve_space = dquot_reserve_space,
961 .claim_space = dquot_claim_space,
962 .release_rsv = dquot_release_reserved_space,
963 .get_reserved_space = ext4_get_reserved_space,
ac27a0ec
DK		 964 .alloc_inode = dquot_alloc_inode,
965 .free_space = dquot_free_space,
966 .free_inode = dquot_free_inode,
967 .transfer = dquot_transfer,
617ba13b
MC		 968 .write_dquot = ext4_write_dquot,
969 .acquire_dquot = ext4_acquire_dquot,
970 .release_dquot = ext4_release_dquot,
971 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 972 .write_info = ext4_write_info,
973 .alloc_dquot = dquot_alloc,
974 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 975};
976
617ba13b
MC		 977static struct quotactl_ops ext4_qctl_operations = {
978 .quota_on = ext4_quota_on,
ac27a0ec
DK		 979 .quota_off = vfs_quota_off,
980 .quota_sync = vfs_quota_sync,
981 .get_info = vfs_get_dqinfo,
982 .set_info = vfs_set_dqinfo,
983 .get_dqblk = vfs_get_dqblk,
984 .set_dqblk = vfs_set_dqblk
985};
986#endif
987
ee9b6d61 988static const struct super_operations ext4_sops = {
617ba13b
MC		 989 .alloc_inode = ext4_alloc_inode,
990 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 991 .write_inode = ext4_write_inode,
992 .dirty_inode = ext4_dirty_inode,
993 .delete_inode = ext4_delete_inode,
994 .put_super = ext4_put_super,
995 .write_super = ext4_write_super,
996 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 997 .freeze_fs = ext4_freeze,
998 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 999 .statfs = ext4_statfs,
1000 .remount_fs = ext4_remount,
1001 .clear_inode = ext4_clear_inode,
1002 .show_options = ext4_show_options,
ac27a0ec 1003#ifdef CONFIG_QUOTA
617ba13b
MC		 1004 .quota_read = ext4_quota_read,
1005 .quota_write = ext4_quota_write,
ac27a0ec 1006#endif
c39a7f84 1007 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1008};
1009
39655164 1010static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1011 .fh_to_dentry = ext4_fh_to_dentry,
1012 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1013 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1014};
1015
1016enum {
1017 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1018 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1019 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1020 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1021 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1022 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1023 Opt_journal_update, Opt_journal_dev,
818d276c 1024 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1025 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
5bf5683a 1026 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec
DK		 1027 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1028 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
06705bff
TT		 1029 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
1030 Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1031 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
b3881f74 1032 Opt_inode_readahead_blks, Opt_journal_ioprio
ac27a0ec
DK		 1033};
1034
a447c093 1035static const match_table_t tokens = {
ac27a0ec
DK		 1036 {Opt_bsd_df, "bsddf"},
1037 {Opt_minix_df, "minixdf"},
1038 {Opt_grpid, "grpid"},
1039 {Opt_grpid, "bsdgroups"},
1040 {Opt_nogrpid, "nogrpid"},
1041 {Opt_nogrpid, "sysvgroups"},
1042 {Opt_resgid, "resgid=%u"},
1043 {Opt_resuid, "resuid=%u"},
1044 {Opt_sb, "sb=%u"},
1045 {Opt_err_cont, "errors=continue"},
1046 {Opt_err_panic, "errors=panic"},
1047 {Opt_err_ro, "errors=remount-ro"},
1048 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1049 {Opt_debug, "debug"},
1050 {Opt_oldalloc, "oldalloc"},
1051 {Opt_orlov, "orlov"},
1052 {Opt_user_xattr, "user_xattr"},
1053 {Opt_nouser_xattr, "nouser_xattr"},
1054 {Opt_acl, "acl"},
1055 {Opt_noacl, "noacl"},
ac27a0ec
DK		 1056 {Opt_noload, "noload"},
1057 {Opt_nobh, "nobh"},
1058 {Opt_bh, "bh"},
1059 {Opt_commit, "commit=%u"},
30773840
TT		 1060 {Opt_min_batch_time, "min_batch_time=%u"},
1061 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1062 {Opt_journal_update, "journal=update"},
ac27a0ec 1063 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1064 {Opt_journal_checksum, "journal_checksum"},
1065 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1066 {Opt_abort, "abort"},
1067 {Opt_data_journal, "data=journal"},
1068 {Opt_data_ordered, "data=ordered"},
1069 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1070 {Opt_data_err_abort, "data_err=abort"},
1071 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1072 {Opt_offusrjquota, "usrjquota="},
1073 {Opt_usrjquota, "usrjquota=%s"},
1074 {Opt_offgrpjquota, "grpjquota="},
1075 {Opt_grpjquota, "grpjquota=%s"},
1076 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1077 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1078 {Opt_grpquota, "grpquota"},
1079 {Opt_noquota, "noquota"},
1080 {Opt_quota, "quota"},
1081 {Opt_usrquota, "usrquota"},
1082 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1083 {Opt_barrier, "barrier"},
1084 {Opt_nobarrier, "nobarrier"},
25ec56b5 1085 {Opt_i_version, "i_version"},
c9de560d 1086 {Opt_stripe, "stripe=%u"},
ac27a0ec 1087 {Opt_resize, "resize"},
64769240 1088 {Opt_delalloc, "delalloc"},
dd919b98 1089 {Opt_nodelalloc, "nodelalloc"},
240799cd 1090 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1091 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1092 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1093 {Opt_auto_da_alloc, "auto_da_alloc"},
1094 {Opt_noauto_da_alloc, "noauto_da_alloc"},
f3f12faa 1095 {Opt_err, NULL},
ac27a0ec
DK		 1096};
1097
617ba13b 1098static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1099{
617ba13b 1100 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1101 char *options = (char *) *data;
1102
1103 if (!options || strncmp(options, "sb=", 3) != 0)
1104 return 1; /* Default location */
1105 options += 3;
617ba13b 1106 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1107 sb_block = simple_strtoul(options, &options, 0);
1108 if (*options && *options != ',') {
4776004f 1109 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1110 (char *) *data);
1111 return 1;
1112 }
1113 if (*options == ',')
1114 options++;
1115 *data = (void *) options;
1116 return sb_block;
1117}
1118
b3881f74
TT		 1119#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1120
2b2d6d01 1121static int parse_options(char *options, struct super_block *sb,
c3191067 1122 unsigned long *journal_devnum,
b3881f74 1123 unsigned int *journal_ioprio,
2b2d6d01 1124 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1125{
617ba13b 1126 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1127 char *p;
ac27a0ec
DK		 1128 substring_t args[MAX_OPT_ARGS];
1129 int data_opt = 0;
1130 int option;
1131#ifdef CONFIG_QUOTA
dfc5d03f 1132 int qtype, qfmt;
ac27a0ec
DK		 1133 char *qname;
1134#endif
1135
1136 if (!options)
1137 return 1;
1138
2b2d6d01 1139 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1140 int token;
1141 if (!*p)
1142 continue;
1143
1144 token = match_token(p, tokens, args);
1145 switch (token) {
1146 case Opt_bsd_df:
2b2d6d01 1147 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1148 break;
1149 case Opt_minix_df:
2b2d6d01 1150 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1151 break;
1152 case Opt_grpid:
2b2d6d01 1153 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1154 break;
1155 case Opt_nogrpid:
2b2d6d01 1156 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1157 break;
1158 case Opt_resuid:
1159 if (match_int(&args[0], &option))
1160 return 0;
1161 sbi->s_resuid = option;
1162 break;
1163 case Opt_resgid:
1164 if (match_int(&args[0], &option))
1165 return 0;
1166 sbi->s_resgid = option;
1167 break;
1168 case Opt_sb:
1169 /* handled by get_sb_block() instead of here */
1170 /* *sb_block = match_int(&args[0]); */
1171 break;
1172 case Opt_err_panic:
2b2d6d01
TT		 1173 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1174 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1175 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1176 break;
1177 case Opt_err_ro:
2b2d6d01
TT		 1178 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1179 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1180 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1181 break;
1182 case Opt_err_cont:
2b2d6d01
TT		 1183 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1184 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1185 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1186 break;
1187 case Opt_nouid32:
2b2d6d01 1188 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1189 break;
ac27a0ec 1190 case Opt_debug:
2b2d6d01 1191 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1192 break;
1193 case Opt_oldalloc:
2b2d6d01 1194 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1195 break;
1196 case Opt_orlov:
2b2d6d01 1197 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1198 break;
03010a33 1199#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1200 case Opt_user_xattr:
2b2d6d01 1201 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1202 break;
1203 case Opt_nouser_xattr:
2b2d6d01 1204 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1205 break;
1206#else
1207 case Opt_user_xattr:
1208 case Opt_nouser_xattr:
4776004f
TT		 1209 printk(KERN_ERR "EXT4 (no)user_xattr options "
1210 "not supported\n");
ac27a0ec
DK		 1211 break;
1212#endif
03010a33 1213#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1214 case Opt_acl:
1215 set_opt(sbi->s_mount_opt, POSIX_ACL);
1216 break;
1217 case Opt_noacl:
1218 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1219 break;
1220#else
1221 case Opt_acl:
1222 case Opt_noacl:
4776004f
TT		 1223 printk(KERN_ERR "EXT4 (no)acl options "
1224 "not supported\n");
ac27a0ec
DK		 1225 break;
1226#endif
ac27a0ec
DK		 1227 case Opt_journal_update:
1228 /* @@@ FIXME */
1229 /* Eventually we will want to be able to create
1230 a journal file here. For now, only allow the
1231 user to specify an existing inode to be the
1232 journal file. */
1233 if (is_remount) {
617ba13b 1234 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1235 "journal on remount\n");
1236 return 0;
1237 }
2b2d6d01 1238 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1239 break;
ac27a0ec
DK		 1240 case Opt_journal_dev:
1241 if (is_remount) {
617ba13b 1242 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1243 "journal on remount\n");
1244 return 0;
1245 }
1246 if (match_int(&args[0], &option))
1247 return 0;
1248 *journal_devnum = option;
1249 break;
818d276c
GS		 1250 case Opt_journal_checksum:
1251 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1252 break;
1253 case Opt_journal_async_commit:
1254 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1255 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1256 break;
ac27a0ec 1257 case Opt_noload:
2b2d6d01 1258 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1259 break;
1260 case Opt_commit:
1261 if (match_int(&args[0], &option))
1262 return 0;
1263 if (option < 0)
1264 return 0;
1265 if (option == 0)
cd02ff0b 1266 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1267 sbi->s_commit_interval = HZ * option;
1268 break;
30773840
TT		 1269 case Opt_max_batch_time:
1270 if (match_int(&args[0], &option))
1271 return 0;
1272 if (option < 0)
1273 return 0;
1274 if (option == 0)
1275 option = EXT4_DEF_MAX_BATCH_TIME;
1276 sbi->s_max_batch_time = option;
1277 break;
1278 case Opt_min_batch_time:
1279 if (match_int(&args[0], &option))
1280 return 0;
1281 if (option < 0)
1282 return 0;
1283 sbi->s_min_batch_time = option;
1284 break;
ac27a0ec 1285 case Opt_data_journal:
617ba13b 1286 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1287 goto datacheck;
1288 case Opt_data_ordered:
617ba13b 1289 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1290 goto datacheck;
1291 case Opt_data_writeback:
617ba13b 1292 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1293 datacheck:
1294 if (is_remount) {
617ba13b 1295 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1296 != data_opt) {
1297 printk(KERN_ERR
617ba13b 1298 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1299 "mode on remount\n");
1300 return 0;
1301 }
1302 } else {
617ba13b 1303 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1304 sbi->s_mount_opt |= data_opt;
1305 }
1306 break;
5bf5683a
HK		 1307 case Opt_data_err_abort:
1308 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1309 break;
1310 case Opt_data_err_ignore:
1311 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1312 break;
ac27a0ec
DK		 1313#ifdef CONFIG_QUOTA
1314 case Opt_usrjquota:
1315 qtype = USRQUOTA;
1316 goto set_qf_name;
1317 case Opt_grpjquota:
1318 qtype = GRPQUOTA;
1319set_qf_name:
17bd13b3 1320 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1321 !sbi->s_qf_names[qtype]) {
ac27a0ec 1322 printk(KERN_ERR
4776004f
TT		 1323 "EXT4-fs: Cannot change journaled "
1324 "quota options when quota turned on.\n");
ac27a0ec
DK		 1325 return 0;
1326 }
1327 qname = match_strdup(&args[0]);
1328 if (!qname) {
1329 printk(KERN_ERR
617ba13b 1330 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1331 "storing quotafile name.\n");
1332 return 0;
1333 }
1334 if (sbi->s_qf_names[qtype] &&
1335 strcmp(sbi->s_qf_names[qtype], qname)) {
1336 printk(KERN_ERR
617ba13b 1337 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1338 "specified.\n", QTYPE2NAME(qtype));
1339 kfree(qname);
1340 return 0;
1341 }
1342 sbi->s_qf_names[qtype] = qname;
1343 if (strchr(sbi->s_qf_names[qtype], '/')) {
1344 printk(KERN_ERR
617ba13b 1345 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1346 "filesystem root.\n");
1347 kfree(sbi->s_qf_names[qtype]);
1348 sbi->s_qf_names[qtype] = NULL;
1349 return 0;
1350 }
1351 set_opt(sbi->s_mount_opt, QUOTA);
1352 break;
1353 case Opt_offusrjquota:
1354 qtype = USRQUOTA;
1355 goto clear_qf_name;
1356 case Opt_offgrpjquota:
1357 qtype = GRPQUOTA;
1358clear_qf_name:
17bd13b3 1359 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1360 sbi->s_qf_names[qtype]) {
617ba13b 1361 printk(KERN_ERR "EXT4-fs: Cannot change "
2c8be6b2 1362 "journaled quota options when "
ac27a0ec
DK		 1363 "quota turned on.\n");
1364 return 0;
1365 }
1366 /*
1367 * The space will be released later when all options
1368 * are confirmed to be correct
1369 */
1370 sbi->s_qf_names[qtype] = NULL;
1371 break;
1372 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1373 qfmt = QFMT_VFS_OLD;
1374 goto set_qf_format;
ac27a0ec 1375 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1376 qfmt = QFMT_VFS_V0;
1377set_qf_format:
17bd13b3 1378 if (sb_any_quota_loaded(sb) &&
dfc5d03f
JK		 1379 sbi->s_jquota_fmt != qfmt) {
1380 printk(KERN_ERR "EXT4-fs: Cannot change "
1381 "journaled quota options when "
1382 "quota turned on.\n");
1383 return 0;
1384 }
1385 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1386 break;
1387 case Opt_quota:
1388 case Opt_usrquota:
1389 set_opt(sbi->s_mount_opt, QUOTA);
1390 set_opt(sbi->s_mount_opt, USRQUOTA);
1391 break;
1392 case Opt_grpquota:
1393 set_opt(sbi->s_mount_opt, QUOTA);
1394 set_opt(sbi->s_mount_opt, GRPQUOTA);
1395 break;
1396 case Opt_noquota:
17bd13b3 1397 if (sb_any_quota_loaded(sb)) {
617ba13b 1398 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1399 "options when quota turned on.\n");
1400 return 0;
1401 }
1402 clear_opt(sbi->s_mount_opt, QUOTA);
1403 clear_opt(sbi->s_mount_opt, USRQUOTA);
1404 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1405 break;
1406#else
1407 case Opt_quota:
1408 case Opt_usrquota:
1409 case Opt_grpquota:
cd59e7b9
JK		 1410 printk(KERN_ERR
1411 "EXT4-fs: quota options not supported.\n");
1412 break;
ac27a0ec
DK		 1413 case Opt_usrjquota:
1414 case Opt_grpjquota:
1415 case Opt_offusrjquota:
1416 case Opt_offgrpjquota:
1417 case Opt_jqfmt_vfsold:
1418 case Opt_jqfmt_vfsv0:
1419 printk(KERN_ERR
cd59e7b9 1420 "EXT4-fs: journaled quota options not "
ac27a0ec
DK		 1421 "supported.\n");
1422 break;
1423 case Opt_noquota:
1424 break;
1425#endif
1426 case Opt_abort:
1427 set_opt(sbi->s_mount_opt, ABORT);
1428 break;
06705bff
TT		 1429 case Opt_nobarrier:
1430 clear_opt(sbi->s_mount_opt, BARRIER);
1431 break;
ac27a0ec 1432 case Opt_barrier:
06705bff
TT		 1433 if (match_int(&args[0], &option)) {
1434 set_opt(sbi->s_mount_opt, BARRIER);
1435 break;
1436 }
ac27a0ec
DK		 1437 if (option)
1438 set_opt(sbi->s_mount_opt, BARRIER);
1439 else
1440 clear_opt(sbi->s_mount_opt, BARRIER);
1441 break;
1442 case Opt_ignore:
1443 break;
1444 case Opt_resize:
1445 if (!is_remount) {
617ba13b 1446 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1447 "for remount\n");
1448 return 0;
1449 }
1450 if (match_int(&args[0], &option) != 0)
1451 return 0;
1452 *n_blocks_count = option;
1453 break;
1454 case Opt_nobh:
1455 set_opt(sbi->s_mount_opt, NOBH);
1456 break;
1457 case Opt_bh:
1458 clear_opt(sbi->s_mount_opt, NOBH);
1459 break;
25ec56b5
JNC		 1460 case Opt_i_version:
1461 set_opt(sbi->s_mount_opt, I_VERSION);
1462 sb->s_flags |= MS_I_VERSION;
1463 break;
dd919b98
AK		 1464 case Opt_nodelalloc:
1465 clear_opt(sbi->s_mount_opt, DELALLOC);
1466 break;
c9de560d
AT		 1467 case Opt_stripe:
1468 if (match_int(&args[0], &option))
1469 return 0;
1470 if (option < 0)
1471 return 0;
1472 sbi->s_stripe = option;
1473 break;
64769240
AT		 1474 case Opt_delalloc:
1475 set_opt(sbi->s_mount_opt, DELALLOC);
1476 break;
240799cd
TT		 1477 case Opt_inode_readahead_blks:
1478 if (match_int(&args[0], &option))
1479 return 0;
1480 if (option < 0 || option > (1 << 30))
1481 return 0;
3197ebdb
TT		 1482 if (option & (option - 1)) {
1483 printk(KERN_ERR "EXT4-fs: inode_readahead_blks"
1484 " must be a power of 2\n");
1485 return 0;
1486 }
240799cd
TT		 1487 sbi->s_inode_readahead_blks = option;
1488 break;
b3881f74
TT		 1489 case Opt_journal_ioprio:
1490 if (match_int(&args[0], &option))
1491 return 0;
1492 if (option < 0 || option > 7)
1493 break;
1494 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1495 option);
1496 break;
06705bff
TT		 1497 case Opt_noauto_da_alloc:
1498 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1499 break;
afd4672d 1500 case Opt_auto_da_alloc:
06705bff
TT		 1501 if (match_int(&args[0], &option)) {
1502 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1503 break;
1504 }
afd4672d
TT		 1505 if (option)
1506 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1507 else
1508 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1509 break;
ac27a0ec 1510 default:
2b2d6d01
TT		 1511 printk(KERN_ERR
1512 "EXT4-fs: Unrecognized mount option \"%s\" "
1513 "or missing value\n", p);
ac27a0ec
DK		 1514 return 0;
1515 }
1516 }
1517#ifdef CONFIG_QUOTA
1518 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1519 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1520 sbi->s_qf_names[USRQUOTA])
1521 clear_opt(sbi->s_mount_opt, USRQUOTA);
1522
617ba13b 1523 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1524 sbi->s_qf_names[GRPQUOTA])
1525 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1526
1527 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1528 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1529 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1530 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1531 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1532 "format mixing.\n");
1533 return 0;
1534 }
1535
1536 if (!sbi->s_jquota_fmt) {
2c8be6b2 1537 printk(KERN_ERR "EXT4-fs: journaled quota format "
ac27a0ec
DK		 1538 "not specified.\n");
1539 return 0;
1540 }
1541 } else {
1542 if (sbi->s_jquota_fmt) {
2c8be6b2
JK		 1543 printk(KERN_ERR "EXT4-fs: journaled quota format "
1544 "specified with no journaling "
ac27a0ec
DK		 1545 "enabled.\n");
1546 return 0;
1547 }
1548 }
1549#endif
1550 return 1;
1551}
1552
617ba13b 1553static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1554 int read_only)
1555{
617ba13b 1556 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1557 int res = 0;
1558
617ba13b 1559 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2b2d6d01
TT		 1560 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1561 "forcing read-only mode\n");
ac27a0ec
DK		 1562 res = MS_RDONLY;
1563 }
1564 if (read_only)
1565 return res;
617ba13b 1566 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2b2d6d01
TT		 1567 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1568 "running e2fsck is recommended\n");
617ba13b 1569 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
2b2d6d01
TT		 1570 printk(KERN_WARNING
1571 "EXT4-fs warning: mounting fs with errors, "
1572 "running e2fsck is recommended\n");
ac27a0ec
DK		 1573 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1574 le16_to_cpu(es->s_mnt_count) >=
1575 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2b2d6d01
TT		 1576 printk(KERN_WARNING
1577 "EXT4-fs warning: maximal mount count reached, "
1578 "running e2fsck is recommended\n");
ac27a0ec
DK		 1579 else if (le32_to_cpu(es->s_checkinterval) &&
1580 (le32_to_cpu(es->s_lastcheck) +
1581 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2b2d6d01
TT		 1582 printk(KERN_WARNING
1583 "EXT4-fs warning: checktime reached, "
1584 "running e2fsck is recommended\n");
0390131b
FM		 1585 if (!sbi->s_journal)
1586 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1587 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1588 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1589 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1590 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1591 ext4_update_dynamic_rev(sb);
0390131b
FM		 1592 if (sbi->s_journal)
1593 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1594
617ba13b 1595 ext4_commit_super(sb, es, 1);
ac27a0ec 1596 if (test_opt(sb, DEBUG))
a9df9a49 1597 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
ac27a0ec
DK		 1598 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1599 sb->s_blocksize,
1600 sbi->s_groups_count,
617ba13b
MC		 1601 EXT4_BLOCKS_PER_GROUP(sb),
1602 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1603 sbi->s_mount_opt);
1604
0390131b
FM		 1605 if (EXT4_SB(sb)->s_journal) {
1606 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1607 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1608 "external", EXT4_SB(sb)->s_journal->j_devname);
1609 } else {
1610 printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id);
1611 }
ac27a0ec
DK		 1612 return res;
1613}
1614
772cb7c8
JS		 1615static int ext4_fill_flex_info(struct super_block *sb)
1616{
1617 struct ext4_sb_info *sbi = EXT4_SB(sb);
1618 struct ext4_group_desc *gdp = NULL;
1619 struct buffer_head *bh;
1620 ext4_group_t flex_group_count;
1621 ext4_group_t flex_group;
1622 int groups_per_flex = 0;
772cb7c8
JS		 1623 int i;
1624
1625 if (!sbi->s_es->s_log_groups_per_flex) {
1626 sbi->s_log_groups_per_flex = 0;
1627 return 1;
1628 }
1629
1630 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1631 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1632
c62a11fd
FB		 1633 /* We allocate both existing and potentially added groups */
1634 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1635 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1636 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
ec05e868 1637 sbi->s_flex_groups = kzalloc(flex_group_count *
772cb7c8
JS		 1638 sizeof(struct flex_groups), GFP_KERNEL);
1639 if (sbi->s_flex_groups == NULL) {
ec05e868 1640 printk(KERN_ERR "EXT4-fs: not enough memory for "
a9df9a49 1641 "%u flex groups\n", flex_group_count);
772cb7c8
JS		 1642 goto failed;
1643 }
772cb7c8 1644
772cb7c8
JS		 1645 for (i = 0; i < sbi->s_groups_count; i++) {
1646 gdp = ext4_get_group_desc(sb, i, &bh);
1647
1648 flex_group = ext4_flex_group(sbi, i);
9f24e420
TT		 1649 atomic_set(&sbi->s_flex_groups[flex_group].free_inodes,
1650 ext4_free_inodes_count(sb, gdp));
1651 atomic_set(&sbi->s_flex_groups[flex_group].free_blocks,
1652 ext4_free_blks_count(sb, gdp));
7d39db14
TT		 1653 atomic_set(&sbi->s_flex_groups[flex_group].used_dirs,
1654 ext4_used_dirs_count(sb, gdp));
772cb7c8
JS		 1655 }
1656
1657 return 1;
1658failed:
1659 return 0;
1660}
1661
717d50e4
AD		 1662__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1663 struct ext4_group_desc *gdp)
1664{
1665 __u16 crc = 0;
1666
1667 if (sbi->s_es->s_feature_ro_compat &
1668 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1669 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1670 __le32 le_group = cpu_to_le32(block_group);
1671
1672 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1673 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1674 crc = crc16(crc, (__u8 *)gdp, offset);
1675 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1676 /* for checksum of struct ext4_group_desc do the rest...*/
1677 if ((sbi->s_es->s_feature_incompat &
1678 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1679 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1680 crc = crc16(crc, (__u8 *)gdp + offset,
1681 le16_to_cpu(sbi->s_es->s_desc_size) -
1682 offset);
1683 }
1684
1685 return cpu_to_le16(crc);
1686}
1687
1688int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1689 struct ext4_group_desc *gdp)
1690{
1691 if ((sbi->s_es->s_feature_ro_compat &
1692 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1693 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1694 return 0;
1695
1696 return 1;
1697}
1698
ac27a0ec 1699/* Called at mount-time, super-block is locked */
197cd65a 1700static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1701{
617ba13b
MC		 1702 struct ext4_sb_info *sbi = EXT4_SB(sb);
1703 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1704 ext4_fsblk_t last_block;
bd81d8ee
LV		 1705 ext4_fsblk_t block_bitmap;
1706 ext4_fsblk_t inode_bitmap;
1707 ext4_fsblk_t inode_table;
ce421581 1708 int flexbg_flag = 0;
fd2d4291 1709 ext4_group_t i;
ac27a0ec 1710
ce421581
JS		 1711 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1712 flexbg_flag = 1;
1713
af5bc92d 1714 ext4_debug("Checking group descriptors");
ac27a0ec 1715
197cd65a
AM		 1716 for (i = 0; i < sbi->s_groups_count; i++) {
1717 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1718
ce421581 1719 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1720 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1721 else
1722 last_block = first_block +
617ba13b 1723 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1724
8fadc143 1725 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1726 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0 1727 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1728 "Block bitmap for group %u not in group "
5128273a 1729 "(block %llu)!\n", i, block_bitmap);
ac27a0ec
DK		 1730 return 0;
1731 }
8fadc143 1732 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1733 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0 1734 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1735 "Inode bitmap for group %u not in group "
5128273a 1736 "(block %llu)!\n", i, inode_bitmap);
ac27a0ec
DK		 1737 return 0;
1738 }
8fadc143 1739 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1740 if (inode_table < first_block ||
2b2d6d01 1741 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0 1742 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1743 "Inode table for group %u not in group "
5128273a 1744 "(block %llu)!\n", i, inode_table);
ac27a0ec
DK		 1745 return 0;
1746 }
b5f10eed 1747 spin_lock(sb_bgl_lock(sbi, i));
717d50e4 1748 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0 1749 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
a9df9a49 1750 "Checksum for group %u failed (%u!=%u)\n",
c19204b0
JB		 1751 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1752 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c
LZ		 1753 if (!(sb->s_flags & MS_RDONLY)) {
1754 spin_unlock(sb_bgl_lock(sbi, i));
8a266467 1755 return 0;
7ee1ec4c 1756 }
717d50e4 1757 }
b5f10eed 1758 spin_unlock(sb_bgl_lock(sbi, i));
ce421581
JS		 1759 if (!flexbg_flag)
1760 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1761 }
1762
bd81d8ee 1763 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1764 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1765 return 1;
1766}
1767
617ba13b 1768/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1769 * the superblock) which were deleted from all directories, but held open by
1770 * a process at the time of a crash. We walk the list and try to delete these
1771 * inodes at recovery time (only with a read-write filesystem).
1772 *
1773 * In order to keep the orphan inode chain consistent during traversal (in
1774 * case of crash during recovery), we link each inode into the superblock
1775 * orphan list_head and handle it the same way as an inode deletion during
1776 * normal operation (which journals the operations for us).
1777 *
1778 * We only do an iget() and an iput() on each inode, which is very safe if we
1779 * accidentally point at an in-use or already deleted inode. The worst that
1780 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1781 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1782 * e2fsck was run on this filesystem, and it must have already done the orphan
1783 * inode cleanup for us, so we can safely abort without any further action.
1784 */
2b2d6d01
TT		 1785static void ext4_orphan_cleanup(struct super_block *sb,
1786 struct ext4_super_block *es)
ac27a0ec
DK		 1787{
1788 unsigned int s_flags = sb->s_flags;
1789 int nr_orphans = 0, nr_truncates = 0;
1790#ifdef CONFIG_QUOTA
1791 int i;
1792#endif
1793 if (!es->s_last_orphan) {
1794 jbd_debug(4, "no orphan inodes to clean up\n");
1795 return;
1796 }
1797
a8f48a95
ES		 1798 if (bdev_read_only(sb->s_bdev)) {
1799 printk(KERN_ERR "EXT4-fs: write access "
1800 "unavailable, skipping orphan cleanup.\n");
1801 return;
1802 }
1803
617ba13b 1804 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1805 if (es->s_last_orphan)
1806 jbd_debug(1, "Errors on filesystem, "
1807 "clearing orphan list.\n");
1808 es->s_last_orphan = 0;
1809 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1810 return;
1811 }
1812
1813 if (s_flags & MS_RDONLY) {
617ba13b 1814 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1815 sb->s_id);
1816 sb->s_flags &= ~MS_RDONLY;
1817 }
1818#ifdef CONFIG_QUOTA
1819 /* Needed for iput() to work correctly and not trash data */
1820 sb->s_flags |= MS_ACTIVE;
1821 /* Turn on quotas so that they are updated correctly */
1822 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1823 if (EXT4_SB(sb)->s_qf_names[i]) {
1824 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1825 if (ret < 0)
1826 printk(KERN_ERR
2c8be6b2 1827 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1828 "quota: error %d\n", ret);
1829 }
1830 }
1831#endif
1832
1833 while (es->s_last_orphan) {
1834 struct inode *inode;
1835
97bd42b9
JB		 1836 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1837 if (IS_ERR(inode)) {
ac27a0ec
DK		 1838 es->s_last_orphan = 0;
1839 break;
1840 }
1841
617ba13b 1842 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
a269eb18 1843 vfs_dq_init(inode);
ac27a0ec
DK		 1844 if (inode->i_nlink) {
1845 printk(KERN_DEBUG
e5f8eab8 1846 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1847 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1848 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1849 inode->i_ino, inode->i_size);
617ba13b 1850 ext4_truncate(inode);
ac27a0ec
DK		 1851 nr_truncates++;
1852 } else {
1853 printk(KERN_DEBUG
1854 "%s: deleting unreferenced inode %lu\n",
46e665e9 1855 __func__, inode->i_ino);
ac27a0ec
DK		 1856 jbd_debug(2, "deleting unreferenced inode %lu\n",
1857 inode->i_ino);
1858 nr_orphans++;
1859 }
1860 iput(inode); /* The delete magic happens here! */
1861 }
1862
2b2d6d01 1863#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1864
1865 if (nr_orphans)
617ba13b 1866 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1867 sb->s_id, PLURAL(nr_orphans));
1868 if (nr_truncates)
617ba13b 1869 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1870 sb->s_id, PLURAL(nr_truncates));
1871#ifdef CONFIG_QUOTA
1872 /* Turn quotas off */
1873 for (i = 0; i < MAXQUOTAS; i++) {
1874 if (sb_dqopt(sb)->files[i])
6f28e087 1875 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1876 }
1877#endif
1878 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1879}
cd2291a4
ES		 1880/*
1881 * Maximal extent format file size.
1882 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1883 * extent format containers, within a sector_t, and within i_blocks
1884 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1885 * so that won't be a limiting factor.
1886 *
1887 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1888 */
f287a1a5 1889static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 1890{
1891 loff_t res;
1892 loff_t upper_limit = MAX_LFS_FILESIZE;
1893
1894 /* small i_blocks in vfs inode? */
f287a1a5 1895 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 1896 /*
b3a6ffe1 1897 * CONFIG_LBD is not enabled implies the inode
cd2291a4
ES		 1898 * i_block represent total blocks in 512 bytes
1899 * 32 == size of vfs inode i_blocks * 8
1900 */
1901 upper_limit = (1LL << 32) - 1;
1902
1903 /* total blocks in file system block size */
1904 upper_limit >>= (blkbits - 9);
1905 upper_limit <<= blkbits;
1906 }
1907
1908 /* 32-bit extent-start container, ee_block */
1909 res = 1LL << 32;
1910 res <<= blkbits;
1911 res -= 1;
1912
1913 /* Sanity check against vm- & vfs- imposed limits */
1914 if (res > upper_limit)
1915 res = upper_limit;
1916
1917 return res;
1918}
ac27a0ec 1919
ac27a0ec 1920/*
cd2291a4 1921 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1922 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1923 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1924 */
f287a1a5 1925static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 1926{
617ba13b 1927 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1928 int meta_blocks;
1929 loff_t upper_limit;
1930 /* This is calculated to be the largest file size for a
cd2291a4 1931 * dense, bitmapped file such that the total number of
ac27a0ec 1932 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1933 * does not exceed 2^48 -1
1934 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1935 * total number of 512 bytes blocks of the file
1936 */
1937
f287a1a5 1938 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 1939 /*
b3a6ffe1 1940 * !has_huge_files or CONFIG_LBD is not enabled
f287a1a5
TT		 1941 * implies the inode i_block represent total blocks in
1942 * 512 bytes 32 == size of vfs inode i_blocks * 8
0fc1b451
AK		 1943 */
1944 upper_limit = (1LL << 32) - 1;
1945
1946 /* total blocks in file system block size */
1947 upper_limit >>= (bits - 9);
1948
1949 } else {
8180a562
AK		 1950 /*
1951 * We use 48 bit ext4_inode i_blocks
1952 * With EXT4_HUGE_FILE_FL set the i_blocks
1953 * represent total number of blocks in
1954 * file system block size
1955 */
0fc1b451
AK		 1956 upper_limit = (1LL << 48) - 1;
1957
0fc1b451
AK		 1958 }
1959
1960 /* indirect blocks */
1961 meta_blocks = 1;
1962 /* double indirect blocks */
1963 meta_blocks += 1 + (1LL << (bits-2));
1964 /* tripple indirect blocks */
1965 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1966
1967 upper_limit -= meta_blocks;
1968 upper_limit <<= bits;
ac27a0ec
DK		 1969
1970 res += 1LL << (bits-2);
1971 res += 1LL << (2*(bits-2));
1972 res += 1LL << (3*(bits-2));
1973 res <<= bits;
1974 if (res > upper_limit)
1975 res = upper_limit;
0fc1b451
AK		 1976
1977 if (res > MAX_LFS_FILESIZE)
1978 res = MAX_LFS_FILESIZE;
1979
ac27a0ec
DK		 1980 return res;
1981}
1982
617ba13b 1983static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1984 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1985{
617ba13b 1986 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1987 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1988 int has_super = 0;
1989
1990 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1991
617ba13b 1992 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1993 nr < first_meta_bg)
70bbb3e0 1994 return logical_sb_block + nr + 1;
ac27a0ec 1995 bg = sbi->s_desc_per_block * nr;
617ba13b 1996 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1997 has_super = 1;
617ba13b 1998 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1999}
2000
c9de560d
AT		 2001/**
2002 * ext4_get_stripe_size: Get the stripe size.
2003 * @sbi: In memory super block info
2004 *
2005 * If we have specified it via mount option, then
2006 * use the mount option value. If the value specified at mount time is
2007 * greater than the blocks per group use the super block value.
2008 * If the super block value is greater than blocks per group return 0.
2009 * Allocator needs it be less than blocks per group.
2010 *
2011 */
2012static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2013{
2014 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2015 unsigned long stripe_width =
2016 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2017
2018 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2019 return sbi->s_stripe;
2020
2021 if (stripe_width <= sbi->s_blocks_per_group)
2022 return stripe_width;
2023
2024 if (stride <= sbi->s_blocks_per_group)
2025 return stride;
2026
2027 return 0;
2028}
ac27a0ec 2029
3197ebdb
TT		 2030/* sysfs supprt */
2031
2032struct ext4_attr {
2033 struct attribute attr;
2034 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2035 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2036 const char *, size_t);
2037 int offset;
2038};
2039
2040static int parse_strtoul(const char *buf,
2041 unsigned long max, unsigned long *value)
2042{
2043 char *endp;
2044
2045 while (*buf && isspace(*buf))
2046 buf++;
2047 *value = simple_strtoul(buf, &endp, 0);
2048 while (*endp && isspace(*endp))
2049 endp++;
2050 if (*endp || *value > max)
2051 return -EINVAL;
2052
2053 return 0;
2054}
2055
2056static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2057 struct ext4_sb_info *sbi,
2058 char *buf)
2059{
2060 return snprintf(buf, PAGE_SIZE, "%llu\n",
2061 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2062}
2063
2064static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2065 struct ext4_sb_info *sbi, char *buf)
2066{
2067 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2068
2069 return snprintf(buf, PAGE_SIZE, "%lu\n",
2070 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2071 sbi->s_sectors_written_start) >> 1);
2072}
2073
2074static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2075 struct ext4_sb_info *sbi, char *buf)
2076{
2077 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2078
2079 return snprintf(buf, PAGE_SIZE, "%llu\n",
2080 sbi->s_kbytes_written +
2081 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2082 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2083}
2084
2085static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2086 struct ext4_sb_info *sbi,
2087 const char *buf, size_t count)
2088{
2089 unsigned long t;
2090
2091 if (parse_strtoul(buf, 0x40000000, &t))
2092 return -EINVAL;
2093
2094 /* inode_readahead_blks must be a power of 2 */
2095 if (t & (t-1))
2096 return -EINVAL;
2097
2098 sbi->s_inode_readahead_blks = t;
2099 return count;
2100}
2101
2102static ssize_t sbi_ui_show(struct ext4_attr *a,
2103 struct ext4_sb_info *sbi, char *buf)
2104{
2105 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2106
2107 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2108}
2109
2110static ssize_t sbi_ui_store(struct ext4_attr *a,
2111 struct ext4_sb_info *sbi,
2112 const char *buf, size_t count)
2113{
2114 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2115 unsigned long t;
2116
2117 if (parse_strtoul(buf, 0xffffffff, &t))
2118 return -EINVAL;
2119 *ui = t;
2120 return count;
2121}
2122
2123#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2124static struct ext4_attr ext4_attr_##_name = { \
2125 .attr = {.name = __stringify(_name), .mode = _mode }, \
2126 .show = _show, \
2127 .store = _store, \
2128 .offset = offsetof(struct ext4_sb_info, _elname), \
2129}
2130#define EXT4_ATTR(name, mode, show, store) \
2131static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2132
2133#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2134#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2135#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2136 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2137#define ATTR_LIST(name) &ext4_attr_##name.attr
2138
2139EXT4_RO_ATTR(delayed_allocation_blocks);
2140EXT4_RO_ATTR(session_write_kbytes);
2141EXT4_RO_ATTR(lifetime_write_kbytes);
2142EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2143 inode_readahead_blks_store, s_inode_readahead_blks);
2144EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2145EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2146EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2147EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2148EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2149EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2150
2151static struct attribute *ext4_attrs[] = {
2152 ATTR_LIST(delayed_allocation_blocks),
2153 ATTR_LIST(session_write_kbytes),
2154 ATTR_LIST(lifetime_write_kbytes),
2155 ATTR_LIST(inode_readahead_blks),
2156 ATTR_LIST(mb_stats),
2157 ATTR_LIST(mb_max_to_scan),
2158 ATTR_LIST(mb_min_to_scan),
2159 ATTR_LIST(mb_order2_req),
2160 ATTR_LIST(mb_stream_req),
2161 ATTR_LIST(mb_group_prealloc),
2162 NULL,
2163};
2164
2165static ssize_t ext4_attr_show(struct kobject *kobj,
2166 struct attribute *attr, char *buf)
2167{
2168 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2169 s_kobj);
2170 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2171
2172 return a->show ? a->show(a, sbi, buf) : 0;
2173}
2174
2175static ssize_t ext4_attr_store(struct kobject *kobj,
2176 struct attribute *attr,
2177 const char *buf, size_t len)
2178{
2179 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2180 s_kobj);
2181 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2182
2183 return a->store ? a->store(a, sbi, buf, len) : 0;
2184}
2185
2186static void ext4_sb_release(struct kobject *kobj)
2187{
2188 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2189 s_kobj);
2190 complete(&sbi->s_kobj_unregister);
2191}
2192
2193
2194static struct sysfs_ops ext4_attr_ops = {
2195 .show = ext4_attr_show,
2196 .store = ext4_attr_store,
2197};
2198
2199static struct kobj_type ext4_ktype = {
2200 .default_attrs = ext4_attrs,
2201 .sysfs_ops = &ext4_attr_ops,
2202 .release = ext4_sb_release,
2203};
2204
2b2d6d01 2205static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2206 __releases(kernel_lock)
2207 __acquires(kernel_lock)
1d03ec98 2208
ac27a0ec 2209{
2b2d6d01 2210 struct buffer_head *bh;
617ba13b
MC		 2211 struct ext4_super_block *es = NULL;
2212 struct ext4_sb_info *sbi;
2213 ext4_fsblk_t block;
2214 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2215 ext4_fsblk_t logical_sb_block;
ac27a0ec 2216 unsigned long offset = 0;
ac27a0ec
DK		 2217 unsigned long journal_devnum = 0;
2218 unsigned long def_mount_opts;
2219 struct inode *root;
9f6200bb 2220 char *cp;
0390131b 2221 const char *descr;
1d1fe1ee 2222 int ret = -EINVAL;
ac27a0ec 2223 int blocksize;
4ec11028
TT		 2224 unsigned int db_count;
2225 unsigned int i;
f287a1a5 2226 int needs_recovery, has_huge_files;
3a06d778 2227 int features;
bd81d8ee 2228 __u64 blocks_count;
833f4077 2229 int err;
b3881f74 2230 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2231
2232 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2233 if (!sbi)
2234 return -ENOMEM;
705895b6
PE		 2235
2236 sbi->s_blockgroup_lock =
2237 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2238 if (!sbi->s_blockgroup_lock) {
2239 kfree(sbi);
2240 return -ENOMEM;
2241 }
ac27a0ec
DK		 2242 sb->s_fs_info = sbi;
2243 sbi->s_mount_opt = 0;
617ba13b
MC		 2244 sbi->s_resuid = EXT4_DEF_RESUID;
2245 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2246 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2247 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2248 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2249 sectors[1]);
ac27a0ec
DK		 2250
2251 unlock_kernel();
2252
9f6200bb
TT		 2253 /* Cleanup superblock name */
2254 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2255 *cp = '!';
2256
617ba13b 2257 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2258 if (!blocksize) {
617ba13b 2259 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 2260 goto out_fail;
2261 }
2262
2263 /*
617ba13b 2264 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2265 * block sizes. We need to calculate the offset from buffer start.
2266 */
617ba13b 2267 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2268 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2269 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2270 } else {
70bbb3e0 2271 logical_sb_block = sb_block;
ac27a0ec
DK		 2272 }
2273
70bbb3e0 2274 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 2275 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 2276 goto out_fail;
2277 }
2278 /*
2279 * Note: s_es must be initialized as soon as possible because
617ba13b 2280 * some ext4 macro-instructions depend on its value
ac27a0ec 2281 */
617ba13b 2282 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2283 sbi->s_es = es;
2284 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2285 if (sb->s_magic != EXT4_SUPER_MAGIC)
2286 goto cantfind_ext4;
afc32f7e 2287 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2288
2289 /* Set defaults before we parse the mount options */
2290 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2291 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2292 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 2293 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 2294 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 2295 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2296 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2297#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2298 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2299 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2300#endif
03010a33 2301#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2302 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2303 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2304#endif
617ba13b
MC		 2305 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2306 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2307 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2308 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2309 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2310 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2311
2312 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2313 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2314 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2315 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2316 else
2317 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2318
2319 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2320 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2321 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2322 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2323 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 2324
571640ca 2325 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2326
dd919b98
AK		 2327 /*
2328 * enable delayed allocation by default
2329 * Use -o nodelalloc to turn it off
2330 */
2331 set_opt(sbi->s_mount_opt, DELALLOC);
2332
2333
b3881f74
TT		 2334 if (!parse_options((char *) data, sb, &journal_devnum,
2335 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2336 goto failed_mount;
2337
2338 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2339 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2340
617ba13b
MC		 2341 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2342 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2343 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2344 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 2345 printk(KERN_WARNING
617ba13b 2346 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 2347 "running e2fsck is recommended\n");
469108ff 2348
ac27a0ec
DK		 2349 /*
2350 * Check feature flags regardless of the revision level, since we
2351 * previously didn't change the revision level when setting the flags,
2352 * so there is a chance incompat flags are set on a rev 0 filesystem.
2353 */
617ba13b 2354 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2355 if (features) {
617ba13b 2356 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
3a06d778
AK		 2357 "unsupported optional features (%x).\n", sb->s_id,
2358 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2359 ~EXT4_FEATURE_INCOMPAT_SUPP));
ac27a0ec
DK		 2360 goto failed_mount;
2361 }
617ba13b 2362 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2363 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2364 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
3a06d778
AK		 2365 "unsupported optional features (%x).\n", sb->s_id,
2366 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2367 ~EXT4_FEATURE_RO_COMPAT_SUPP));
ac27a0ec
DK		 2368 goto failed_mount;
2369 }
f287a1a5
TT		 2370 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2371 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2372 if (has_huge_files) {
0fc1b451
AK		 2373 /*
2374 * Large file size enabled file system can only be
b3a6ffe1 2375 * mount if kernel is build with CONFIG_LBD
0fc1b451
AK		 2376 */
2377 if (sizeof(root->i_blocks) < sizeof(u64) &&
2378 !(sb->s_flags & MS_RDONLY)) {
2379 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2380 "files cannot be mounted read-write "
b3a6ffe1 2381 "without CONFIG_LBD.\n", sb->s_id);
0fc1b451
AK		 2382 goto failed_mount;
2383 }
2384 }
ac27a0ec
DK		 2385 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2386
617ba13b
MC		 2387 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2388 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2389 printk(KERN_ERR
617ba13b 2390 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2391 blocksize, sb->s_id);
2392 goto failed_mount;
2393 }
2394
ac27a0ec 2395 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2396
2397 /* Validate the filesystem blocksize */
2398 if (!sb_set_blocksize(sb, blocksize)) {
2399 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2400 blocksize);
ac27a0ec
DK		 2401 goto failed_mount;
2402 }
2403
2b2d6d01 2404 brelse(bh);
70bbb3e0
AM		 2405 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2406 offset = do_div(logical_sb_block, blocksize);
2407 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2408 if (!bh) {
2409 printk(KERN_ERR
617ba13b 2410 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2411 goto failed_mount;
2412 }
617ba13b 2413 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2414 sbi->s_es = es;
617ba13b 2415 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2416 printk(KERN_ERR
2417 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2418 goto failed_mount;
2419 }
2420 }
2421
f287a1a5
TT		 2422 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2423 has_huge_files);
2424 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2425
617ba13b
MC		 2426 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2427 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2428 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2429 } else {
2430 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2431 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2432 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2433 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2434 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2435 printk(KERN_ERR
2436 "EXT4-fs: unsupported inode size: %d\n",
2437 sbi->s_inode_size);
ac27a0ec
DK		 2438 goto failed_mount;
2439 }
ef7f3835
KS		 2440 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2441 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2442 }
0d1ee42f
AR		 2443 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2444 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2445 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2446 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2447 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2448 printk(KERN_ERR
8fadc143 2449 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2450 sbi->s_desc_size);
2451 goto failed_mount;
2452 }
2453 } else
2454 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2455 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2456 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2457 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2458 goto cantfind_ext4;
2459 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2460 if (sbi->s_inodes_per_block == 0)
617ba13b 2461 goto cantfind_ext4;
ac27a0ec
DK		 2462 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2463 sbi->s_inodes_per_block;
0d1ee42f 2464 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2465 sbi->s_sbh = bh;
2466 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2467 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2468 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2469 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2470 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2471 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2472 i = le32_to_cpu(es->s_flags);
2473 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2474 sbi->s_hash_unsigned = 3;
2475 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2476#ifdef __CHAR_UNSIGNED__
2477 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2478 sbi->s_hash_unsigned = 3;
2479#else
2480 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2481#endif
2482 sb->s_dirt = 1;
2483 }
ac27a0ec
DK		 2484
2485 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2486 printk(KERN_ERR
2487 "EXT4-fs: #blocks per group too big: %lu\n",
2488 sbi->s_blocks_per_group);
ac27a0ec
DK		 2489 goto failed_mount;
2490 }
ac27a0ec 2491 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2492 printk(KERN_ERR
2493 "EXT4-fs: #inodes per group too big: %lu\n",
2494 sbi->s_inodes_per_group);
ac27a0ec
DK		 2495 goto failed_mount;
2496 }
2497
bd81d8ee 2498 if (ext4_blocks_count(es) >
ac27a0ec 2499 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2500 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2501 " too large to mount safely\n", sb->s_id);
2502 if (sizeof(sector_t) < 8)
617ba13b 2503 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2504 "enabled\n");
2505 goto failed_mount;
2506 }
2507
617ba13b
MC		 2508 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2509 goto cantfind_ext4;
e7c95593 2510
4ec11028
TT		 2511 /*
2512 * It makes no sense for the first data block to be beyond the end
2513 * of the filesystem.
2514 */
2515 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2516 printk(KERN_WARNING "EXT4-fs: bad geometry: first data"
2517 "block %u is beyond end of filesystem (%llu)\n",
2518 le32_to_cpu(es->s_first_data_block),
2519 ext4_blocks_count(es));
e7c95593
ES		 2520 goto failed_mount;
2521 }
bd81d8ee
LV		 2522 blocks_count = (ext4_blocks_count(es) -
2523 le32_to_cpu(es->s_first_data_block) +
2524 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2525 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028
TT		 2526 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2527 printk(KERN_WARNING "EXT4-fs: groups count too large: %u "
2528 "(block count %llu, first data block %u, "
2529 "blocks per group %lu)\n", sbi->s_groups_count,
2530 ext4_blocks_count(es),
2531 le32_to_cpu(es->s_first_data_block),
2532 EXT4_BLOCKS_PER_GROUP(sb));
2533 goto failed_mount;
2534 }
bd81d8ee 2535 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2536 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2537 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2538 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2539 GFP_KERNEL);
2540 if (sbi->s_group_desc == NULL) {
2b2d6d01 2541 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2542 goto failed_mount;
2543 }
2544
3244fcb1 2545#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2546 if (ext4_proc_root)
2547 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2548#endif
240799cd 2549
705895b6 2550 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2551
2552 for (i = 0; i < db_count; i++) {
70bbb3e0 2553 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2554 sbi->s_group_desc[i] = sb_bread(sb, block);
2555 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2556 printk(KERN_ERR "EXT4-fs: "
2557 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2558 db_count = i;
2559 goto failed_mount2;
2560 }
2561 }
2b2d6d01 2562 if (!ext4_check_descriptors(sb)) {
617ba13b 2563 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2564 goto failed_mount2;
2565 }
772cb7c8
JS		 2566 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2567 if (!ext4_fill_flex_info(sb)) {
2568 printk(KERN_ERR
2569 "EXT4-fs: unable to initialize "
2570 "flex_bg meta info!\n");
2571 goto failed_mount2;
2572 }
2573
ac27a0ec
DK		 2574 sbi->s_gdb_count = db_count;
2575 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2576 spin_lock_init(&sbi->s_next_gen_lock);
2577
833f4077
PZ		 2578 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2579 ext4_count_free_blocks(sb));
2580 if (!err) {
2581 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2582 ext4_count_free_inodes(sb));
2583 }
2584 if (!err) {
2585 err = percpu_counter_init(&sbi->s_dirs_counter,
2586 ext4_count_dirs(sb));
2587 }
6bc6e63f
AK		 2588 if (!err) {
2589 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2590 }
833f4077
PZ		 2591 if (err) {
2592 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2593 goto failed_mount3;
2594 }
ac27a0ec 2595
c9de560d
AT		 2596 sbi->s_stripe = ext4_get_stripe_size(sbi);
2597
ac27a0ec
DK		 2598 /*
2599 * set up enough so that it can read an inode
2600 */
617ba13b
MC		 2601 sb->s_op = &ext4_sops;
2602 sb->s_export_op = &ext4_export_ops;
2603 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2604#ifdef CONFIG_QUOTA
617ba13b
MC		 2605 sb->s_qcop = &ext4_qctl_operations;
2606 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2607#endif
2608 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2609
2610 sb->s_root = NULL;
2611
2612 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2613 EXT4_HAS_INCOMPAT_FEATURE(sb,
2614 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2615
2616 /*
2617 * The first inode we look at is the journal inode. Don't try
2618 * root first: it may be modified in the journal!
2619 */
2620 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2621 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2622 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2623 goto failed_mount3;
624080ed
TT		 2624 if (!(sb->s_flags & MS_RDONLY) &&
2625 EXT4_SB(sb)->s_journal->j_failed_commit) {
2626 printk(KERN_CRIT "EXT4-fs error (device %s): "
2627 "ext4_fill_super: Journal transaction "
2b2d6d01 2628 "%u is corrupt\n", sb->s_id,
624080ed 2629 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2630 if (test_opt(sb, ERRORS_RO)) {
2631 printk(KERN_CRIT
2632 "Mounting filesystem read-only\n");
624080ed
TT		 2633 sb->s_flags |= MS_RDONLY;
2634 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2635 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2636 }
2637 if (test_opt(sb, ERRORS_PANIC)) {
2638 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2639 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2640 ext4_commit_super(sb, es, 1);
624080ed
TT		 2641 goto failed_mount4;
2642 }
2643 }
0390131b
FM		 2644 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2645 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2646 printk(KERN_ERR "EXT4-fs: required journal recovery "
2647 "suppressed and not mounted read-only\n");
2648 goto failed_mount4;
ac27a0ec 2649 } else {
0390131b
FM		 2650 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2651 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2652 sbi->s_journal = NULL;
2653 needs_recovery = 0;
2654 goto no_journal;
ac27a0ec
DK		 2655 }
2656
eb40a09c
JS		 2657 if (ext4_blocks_count(es) > 0xffffffffULL &&
2658 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2659 JBD2_FEATURE_INCOMPAT_64BIT)) {
abda1418 2660 printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n");
eb40a09c
JS		 2661 goto failed_mount4;
2662 }
2663
818d276c
GS		 2664 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2665 jbd2_journal_set_features(sbi->s_journal,
2666 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2667 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2668 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2669 jbd2_journal_set_features(sbi->s_journal,
2670 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2671 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2672 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2673 } else {
2674 jbd2_journal_clear_features(sbi->s_journal,
2675 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2676 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2677 }
2678
ac27a0ec
DK		 2679 /* We have now updated the journal if required, so we can
2680 * validate the data journaling mode. */
2681 switch (test_opt(sb, DATA_FLAGS)) {
2682 case 0:
2683 /* No mode set, assume a default based on the journal
63f57933
AM		 2684 * capabilities: ORDERED_DATA if the journal can
2685 * cope, else JOURNAL_DATA
2686 */
dab291af
MC		 2687 if (jbd2_journal_check_available_features
2688 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2689 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2690 else
2691 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2692 break;
2693
617ba13b
MC		 2694 case EXT4_MOUNT_ORDERED_DATA:
2695 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2696 if (!jbd2_journal_check_available_features
2697 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2698 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2699 "requested data journaling mode\n");
2700 goto failed_mount4;
2701 }
2702 default:
2703 break;
2704 }
b3881f74 2705 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2706
0390131b 2707no_journal:
ac27a0ec
DK		 2708
2709 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2710 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2711 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2712 "its supported only with writeback mode\n");
2713 clear_opt(sbi->s_mount_opt, NOBH);
2714 }
2715 }
2716 /*
dab291af 2717 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2718 * so we can safely mount the rest of the filesystem now.
2719 */
2720
1d1fe1ee
DH		 2721 root = ext4_iget(sb, EXT4_ROOT_INO);
2722 if (IS_ERR(root)) {
617ba13b 2723 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2724 ret = PTR_ERR(root);
ac27a0ec
DK		 2725 goto failed_mount4;
2726 }
2727 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2728 iput(root);
617ba13b 2729 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2730 goto failed_mount4;
2731 }
1d1fe1ee
DH		 2732 sb->s_root = d_alloc_root(root);
2733 if (!sb->s_root) {
2734 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2735 iput(root);
2736 ret = -ENOMEM;
2737 goto failed_mount4;
2738 }
ac27a0ec 2739
2b2d6d01 2740 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2741
2742 /* determine the minimum size of new large inodes, if present */
2743 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2744 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2745 EXT4_GOOD_OLD_INODE_SIZE;
2746 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2747 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2748 if (sbi->s_want_extra_isize <
2749 le16_to_cpu(es->s_want_extra_isize))
2750 sbi->s_want_extra_isize =
2751 le16_to_cpu(es->s_want_extra_isize);
2752 if (sbi->s_want_extra_isize <
2753 le16_to_cpu(es->s_min_extra_isize))
2754 sbi->s_want_extra_isize =
2755 le16_to_cpu(es->s_min_extra_isize);
2756 }
2757 }
2758 /* Check if enough inode space is available */
2759 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2760 sbi->s_inode_size) {
2761 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2762 EXT4_GOOD_OLD_INODE_SIZE;
2763 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2764 "available.\n");
2765 }
2766
c2774d84
AK		 2767 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2768 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2769 "requested data journaling mode\n");
2770 clear_opt(sbi->s_mount_opt, DELALLOC);
2771 } else if (test_opt(sb, DELALLOC))
2772 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2773
2774 ext4_ext_init(sb);
2775 err = ext4_mb_init(sb, needs_recovery);
2776 if (err) {
2777 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2778 err);
2779 goto failed_mount4;
2780 }
2781
3197ebdb
TT		 2782 sbi->s_kobj.kset = ext4_kset;
2783 init_completion(&sbi->s_kobj_unregister);
2784 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2785 "%s", sb->s_id);
2786 if (err) {
2787 ext4_mb_release(sb);
2788 ext4_ext_release(sb);
2789 goto failed_mount4;
2790 };
2791
ac27a0ec
DK		 2792 /*
2793 * akpm: core read_super() calls in here with the superblock locked.
2794 * That deadlocks, because orphan cleanup needs to lock the superblock
2795 * in numerous places. Here we just pop the lock - it's relatively
2796 * harmless, because we are now ready to accept write_super() requests,
2797 * and aviro says that's the only reason for hanging onto the
2798 * superblock lock.
2799 */
617ba13b
MC		 2800 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2801 ext4_orphan_cleanup(sb, es);
2802 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 2803 if (needs_recovery) {
2b2d6d01 2804 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
0390131b
FM		 2805 ext4_mark_recovery_complete(sb, es);
2806 }
2807 if (EXT4_SB(sb)->s_journal) {
2808 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2809 descr = " journalled data mode";
2810 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2811 descr = " ordered data mode";
2812 else
2813 descr = " writeback data mode";
2814 } else
2815 descr = "out journal";
2816
2817 printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n",
2818 sb->s_id, descr);
ac27a0ec
DK		 2819
2820 lock_kernel();
2821 return 0;
2822
617ba13b 2823cantfind_ext4:
ac27a0ec 2824 if (!silent)
617ba13b 2825 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2826 sb->s_id);
2827 goto failed_mount;
2828
2829failed_mount4:
0390131b
FM		 2830 printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id);
2831 if (sbi->s_journal) {
2832 jbd2_journal_destroy(sbi->s_journal);
2833 sbi->s_journal = NULL;
2834 }
ac27a0ec
DK		 2835failed_mount3:
2836 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2837 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2838 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2839 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2840failed_mount2:
2841 for (i = 0; i < db_count; i++)
2842 brelse(sbi->s_group_desc[i]);
2843 kfree(sbi->s_group_desc);
2844failed_mount:
240799cd 2845 if (sbi->s_proc) {
9f6200bb 2846 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 2847 }
ac27a0ec
DK		 2848#ifdef CONFIG_QUOTA
2849 for (i = 0; i < MAXQUOTAS; i++)
2850 kfree(sbi->s_qf_names[i]);
2851#endif
617ba13b 2852 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2853 brelse(bh);
2854out_fail:
2855 sb->s_fs_info = NULL;
2856 kfree(sbi);
2857 lock_kernel();
1d1fe1ee 2858 return ret;
ac27a0ec
DK		 2859}
2860
2861/*
2862 * Setup any per-fs journal parameters now. We'll do this both on
2863 * initial mount, once the journal has been initialised but before we've
2864 * done any recovery; and again on any subsequent remount.
2865 */
617ba13b 2866static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2867{
617ba13b 2868 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 2869
30773840
TT		 2870 journal->j_commit_interval = sbi->s_commit_interval;
2871 journal->j_min_batch_time = sbi->s_min_batch_time;
2872 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 2873
2874 spin_lock(&journal->j_state_lock);
2875 if (test_opt(sb, BARRIER))
dab291af 2876 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2877 else
dab291af 2878 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 2879 if (test_opt(sb, DATA_ERR_ABORT))
2880 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2881 else
2882 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 2883 spin_unlock(&journal->j_state_lock);
2884}
2885
617ba13b 2886static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2887 unsigned int journal_inum)
2888{
2889 struct inode *journal_inode;
2890 journal_t *journal;
2891
0390131b
FM		 2892 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2893
ac27a0ec
DK		 2894 /* First, test for the existence of a valid inode on disk. Bad
2895 * things happen if we iget() an unused inode, as the subsequent
2896 * iput() will try to delete it. */
2897
1d1fe1ee
DH		 2898 journal_inode = ext4_iget(sb, journal_inum);
2899 if (IS_ERR(journal_inode)) {
617ba13b 2900 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2901 return NULL;
2902 }
2903 if (!journal_inode->i_nlink) {
2904 make_bad_inode(journal_inode);
2905 iput(journal_inode);
617ba13b 2906 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2907 return NULL;
2908 }
2909
e5f8eab8 2910 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2911 journal_inode, journal_inode->i_size);
1d1fe1ee 2912 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2913 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2914 iput(journal_inode);
2915 return NULL;
2916 }
2917
dab291af 2918 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2919 if (!journal) {
617ba13b 2920 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2921 iput(journal_inode);
2922 return NULL;
2923 }
2924 journal->j_private = sb;
617ba13b 2925 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2926 return journal;
2927}
2928
617ba13b 2929static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2930 dev_t j_dev)
2931{
2b2d6d01 2932 struct buffer_head *bh;
ac27a0ec 2933 journal_t *journal;
617ba13b
MC		 2934 ext4_fsblk_t start;
2935 ext4_fsblk_t len;
ac27a0ec 2936 int hblock, blocksize;
617ba13b 2937 ext4_fsblk_t sb_block;
ac27a0ec 2938 unsigned long offset;
2b2d6d01 2939 struct ext4_super_block *es;
ac27a0ec
DK		 2940 struct block_device *bdev;
2941
0390131b
FM		 2942 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2943
617ba13b 2944 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2945 if (bdev == NULL)
2946 return NULL;
2947
2948 if (bd_claim(bdev, sb)) {
2949 printk(KERN_ERR
abda1418 2950 "EXT4-fs: failed to claim external journal device.\n");
9a1c3542 2951 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 2952 return NULL;
2953 }
2954
2955 blocksize = sb->s_blocksize;
2956 hblock = bdev_hardsect_size(bdev);
2957 if (blocksize < hblock) {
2958 printk(KERN_ERR
617ba13b 2959 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2960 goto out_bdev;
2961 }
2962
617ba13b
MC		 2963 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2964 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2965 set_blocksize(bdev, blocksize);
2966 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2967 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2968 "external journal\n");
2969 goto out_bdev;
2970 }
2971
617ba13b
MC		 2972 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2973 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2974 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2975 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2976 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2977 "bad superblock\n");
2978 brelse(bh);
2979 goto out_bdev;
2980 }
2981
617ba13b
MC		 2982 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2983 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2984 brelse(bh);
2985 goto out_bdev;
2986 }
2987
bd81d8ee 2988 len = ext4_blocks_count(es);
ac27a0ec
DK		 2989 start = sb_block + 1;
2990 brelse(bh); /* we're done with the superblock */
2991
dab291af 2992 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2993 start, len, blocksize);
2994 if (!journal) {
617ba13b 2995 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2996 goto out_bdev;
2997 }
2998 journal->j_private = sb;
2999 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3000 wait_on_buffer(journal->j_sb_buffer);
3001 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 3002 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 3003 goto out_journal;
3004 }
3005 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 3006 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 3007 "user (unsupported) - %d\n",
3008 be32_to_cpu(journal->j_superblock->s_nr_users));
3009 goto out_journal;
3010 }
617ba13b
MC		 3011 EXT4_SB(sb)->journal_bdev = bdev;
3012 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3013 return journal;
3014out_journal:
dab291af 3015 jbd2_journal_destroy(journal);
ac27a0ec 3016out_bdev:
617ba13b 3017 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3018 return NULL;
3019}
3020
617ba13b
MC		 3021static int ext4_load_journal(struct super_block *sb,
3022 struct ext4_super_block *es,
ac27a0ec
DK		 3023 unsigned long journal_devnum)
3024{
3025 journal_t *journal;
3026 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3027 dev_t journal_dev;
3028 int err = 0;
3029 int really_read_only;
3030
0390131b
FM		 3031 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3032
ac27a0ec
DK		 3033 if (journal_devnum &&
3034 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 3035 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 3036 "numbers have changed\n");
3037 journal_dev = new_decode_dev(journal_devnum);
3038 } else
3039 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3040
3041 really_read_only = bdev_read_only(sb->s_bdev);
3042
3043 /*
3044 * Are we loading a blank journal or performing recovery after a
3045 * crash? For recovery, we need to check in advance whether we
3046 * can get read-write access to the device.
3047 */
3048
617ba13b 3049 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3050 if (sb->s_flags & MS_RDONLY) {
617ba13b 3051 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 3052 "required on readonly filesystem.\n");
3053 if (really_read_only) {
617ba13b 3054 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 3055 "unavailable, cannot proceed.\n");
3056 return -EROFS;
3057 }
2b2d6d01
TT		 3058 printk(KERN_INFO "EXT4-fs: write access will "
3059 "be enabled during recovery.\n");
ac27a0ec
DK		 3060 }
3061 }
3062
3063 if (journal_inum && journal_dev) {
617ba13b 3064 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 3065 "and inode journals!\n");
3066 return -EINVAL;
3067 }
3068
3069 if (journal_inum) {
617ba13b 3070 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3071 return -EINVAL;
3072 } else {
617ba13b 3073 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3074 return -EINVAL;
3075 }
3076
4776004f
TT		 3077 if (journal->j_flags & JBD2_BARRIER)
3078 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
3079 else
3080 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
3081
ac27a0ec 3082 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3083 err = jbd2_journal_update_format(journal);
ac27a0ec 3084 if (err) {
617ba13b 3085 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 3086 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3087 return err;
3088 }
3089 }
3090
617ba13b 3091 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3092 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3093 if (!err)
dab291af 3094 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3095
3096 if (err) {
617ba13b 3097 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 3098 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3099 return err;
3100 }
3101
617ba13b
MC		 3102 EXT4_SB(sb)->s_journal = journal;
3103 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3104
3105 if (journal_devnum &&
3106 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3107 es->s_journal_dev = cpu_to_le32(journal_devnum);
3108 sb->s_dirt = 1;
3109
3110 /* Make sure we flush the recovery flag to disk. */
617ba13b 3111 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 3112 }
3113
3114 return 0;
3115}
3116
c4be0c1d 3117static int ext4_commit_super(struct super_block *sb,
2b2d6d01 3118 struct ext4_super_block *es, int sync)
ac27a0ec 3119{
617ba13b 3120 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3121 int error = 0;
ac27a0ec
DK		 3122
3123 if (!sbh)
c4be0c1d 3124 return error;
914258bf
TT		 3125 if (buffer_write_io_error(sbh)) {
3126 /*
3127 * Oh, dear. A previous attempt to write the
3128 * superblock failed. This could happen because the
3129 * USB device was yanked out. Or it could happen to
3130 * be a transient write error and maybe the block will
3131 * be remapped. Nothing we can do but to retry the
3132 * write and hope for the best.
3133 */
abda1418 3134 printk(KERN_ERR "EXT4-fs: previous I/O error to "
914258bf
TT		 3135 "superblock detected for %s.\n", sb->s_id);
3136 clear_buffer_write_io_error(sbh);
3137 set_buffer_uptodate(sbh);
3138 }
ac27a0ec 3139 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3140 es->s_kbytes_written =
3141 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3142 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3143 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3144 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3145 &EXT4_SB(sb)->s_freeblocks_counter));
3146 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3147 &EXT4_SB(sb)->s_freeinodes_counter));
3148
ac27a0ec
DK		 3149 BUFFER_TRACE(sbh, "marking dirty");
3150 mark_buffer_dirty(sbh);
914258bf 3151 if (sync) {
c4be0c1d
TS		 3152 error = sync_dirty_buffer(sbh);
3153 if (error)
3154 return error;
3155
3156 error = buffer_write_io_error(sbh);
3157 if (error) {
abda1418 3158 printk(KERN_ERR "EXT4-fs: I/O error while writing "
914258bf
TT		 3159 "superblock for %s.\n", sb->s_id);
3160 clear_buffer_write_io_error(sbh);
3161 set_buffer_uptodate(sbh);
3162 }
3163 }
c4be0c1d 3164 return error;
ac27a0ec
DK		 3165}
3166
3167
3168/*
3169 * Have we just finished recovery? If so, and if we are mounting (or
3170 * remounting) the filesystem readonly, then we will end up with a
3171 * consistent fs on disk. Record that fact.
3172 */
2b2d6d01
TT		 3173static void ext4_mark_recovery_complete(struct super_block *sb,
3174 struct ext4_super_block *es)
ac27a0ec 3175{
617ba13b 3176 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3177
0390131b
FM		 3178 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3179 BUG_ON(journal != NULL);
3180 return;
3181 }
dab291af 3182 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3183 if (jbd2_journal_flush(journal) < 0)
3184 goto out;
3185
32c37730 3186 lock_super(sb);
617ba13b 3187 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3188 sb->s_flags & MS_RDONLY) {
617ba13b 3189 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 3190 sb->s_dirt = 0;
617ba13b 3191 ext4_commit_super(sb, es, 1);
ac27a0ec 3192 }
32c37730 3193 unlock_super(sb);
7ffe1ea8
HK		 3194
3195out:
dab291af 3196 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3197}
3198
3199/*
3200 * If we are mounting (or read-write remounting) a filesystem whose journal
3201 * has recorded an error from a previous lifetime, move that error to the
3202 * main filesystem now.
3203 */
2b2d6d01
TT		 3204static void ext4_clear_journal_err(struct super_block *sb,
3205 struct ext4_super_block *es)
ac27a0ec
DK		 3206{
3207 journal_t *journal;
3208 int j_errno;
3209 const char *errstr;
3210
0390131b
FM		 3211 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3212
617ba13b 3213 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3214
3215 /*
3216 * Now check for any error status which may have been recorded in the
617ba13b 3217 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3218 */
3219
dab291af 3220 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3221 if (j_errno) {
3222 char nbuf[16];
3223
617ba13b 3224 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 3225 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 3226 "from previous mount: %s", errstr);
46e665e9 3227 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 3228 "filesystem check.");
3229
617ba13b
MC		 3230 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3231 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2b2d6d01 3232 ext4_commit_super(sb, es, 1);
ac27a0ec 3233
dab291af 3234 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3235 }
3236}
3237
3238/*
3239 * Force the running and committing transactions to commit,
3240 * and wait on the commit.
3241 */
617ba13b 3242int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3243{
3244 journal_t *journal;
0390131b 3245 int ret = 0;
ac27a0ec
DK		 3246
3247 if (sb->s_flags & MS_RDONLY)
3248 return 0;
3249
617ba13b 3250 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 3251 if (journal) {
3252 sb->s_dirt = 0;
3253 ret = ext4_journal_force_commit(journal);
3254 }
3255
ac27a0ec
DK		 3256 return ret;
3257}
3258
3259/*
617ba13b 3260 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec 3261 * have to propagate any other updates to the superblock on disk at this
14ce0cb4
TT		 3262 * point. (We can probably nuke this function altogether, and remove
3263 * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...)
ac27a0ec 3264 */
2b2d6d01 3265static void ext4_write_super(struct super_block *sb)
ac27a0ec 3266{
0390131b
FM		 3267 if (EXT4_SB(sb)->s_journal) {
3268 if (mutex_trylock(&sb->s_lock) != 0)
3269 BUG();
3270 sb->s_dirt = 0;
3271 } else {
3272 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3273 }
ac27a0ec
DK		 3274}
3275
617ba13b 3276static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3277{
14ce0cb4 3278 int ret = 0;
9eddacf9 3279 tid_t target;
ac27a0ec 3280
ede86cc4 3281 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
ac27a0ec 3282 sb->s_dirt = 0;
0390131b 3283 if (EXT4_SB(sb)->s_journal) {
9eddacf9
JK		 3284 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal,
3285 &target)) {
3286 if (wait)
3287 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal,
3288 target);
3289 }
0390131b
FM		 3290 } else {
3291 ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait);
3292 }
14ce0cb4 3293 return ret;
ac27a0ec
DK		 3294}
3295
3296/*
3297 * LVM calls this function before a (read-only) snapshot is created. This
3298 * gives us a chance to flush the journal completely and mark the fs clean.
3299 */
c4be0c1d 3300static int ext4_freeze(struct super_block *sb)
ac27a0ec 3301{
c4be0c1d
TS		 3302 int error = 0;
3303 journal_t *journal;
ac27a0ec
DK		 3304 sb->s_dirt = 0;
3305
3306 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 3307 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3308
0390131b
FM		 3309 if (journal) {
3310 /* Now we set up the journal barrier. */
3311 jbd2_journal_lock_updates(journal);
7ffe1ea8 3312
0390131b
FM		 3313 /*
3314 * We don't want to clear needs_recovery flag when we
3315 * failed to flush the journal.
3316 */
c4be0c1d
TS		 3317 error = jbd2_journal_flush(journal);
3318 if (error < 0)
3319 goto out;
0390131b 3320 }
ac27a0ec
DK		 3321
3322 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b 3323 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 3324 error = ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3325 if (error)
3326 goto out;
ac27a0ec 3327 }
c4be0c1d
TS		 3328 return 0;
3329out:
3330 jbd2_journal_unlock_updates(journal);
3331 return error;
ac27a0ec
DK		 3332}
3333
3334/*
3335 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3336 * flag here, even though the filesystem is not technically dirty yet.
3337 */
c4be0c1d 3338static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3339{
0390131b 3340 if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) {
ac27a0ec
DK		 3341 lock_super(sb);
3342 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 3343 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3344 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 3345 unlock_super(sb);
dab291af 3346 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec 3347 }
c4be0c1d 3348 return 0;
ac27a0ec
DK		 3349}
3350
2b2d6d01 3351static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3352{
2b2d6d01 3353 struct ext4_super_block *es;
617ba13b
MC		 3354 struct ext4_sb_info *sbi = EXT4_SB(sb);
3355 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3356 unsigned long old_sb_flags;
617ba13b 3357 struct ext4_mount_options old_opts;
8a266467 3358 ext4_group_t g;
b3881f74 3359 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3360 int err;
3361#ifdef CONFIG_QUOTA
3362 int i;
3363#endif
3364
3365 /* Store the original options */
3366 old_sb_flags = sb->s_flags;
3367 old_opts.s_mount_opt = sbi->s_mount_opt;
3368 old_opts.s_resuid = sbi->s_resuid;
3369 old_opts.s_resgid = sbi->s_resgid;
3370 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3371 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3372 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3373#ifdef CONFIG_QUOTA
3374 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3375 for (i = 0; i < MAXQUOTAS; i++)
3376 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3377#endif
b3881f74
TT		 3378 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3379 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3380
3381 /*
3382 * Allow the "check" option to be passed as a remount option.
3383 */
b3881f74
TT		 3384 if (!parse_options(data, sb, NULL, &journal_ioprio,
3385 &n_blocks_count, 1)) {
ac27a0ec
DK		 3386 err = -EINVAL;
3387 goto restore_opts;
3388 }
3389
617ba13b 3390 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 3391 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3392
3393 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3394 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3395
3396 es = sbi->s_es;
3397
b3881f74 3398 if (sbi->s_journal) {
0390131b 3399 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3400 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3401 }
ac27a0ec
DK		 3402
3403 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3404 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3405 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3406 err = -EROFS;
3407 goto restore_opts;
3408 }
3409
3410 if (*flags & MS_RDONLY) {
3411 /*
3412 * First of all, the unconditional stuff we have to do
3413 * to disable replay of the journal when we next remount
3414 */
3415 sb->s_flags |= MS_RDONLY;
3416
3417 /*
3418 * OK, test if we are remounting a valid rw partition
3419 * readonly, and if so set the rdonly flag and then
3420 * mark the partition as valid again.
3421 */
617ba13b
MC		 3422 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3423 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3424 es->s_state = cpu_to_le16(sbi->s_mount_state);
3425
32c37730
JK		 3426 /*
3427 * We have to unlock super so that we can wait for
3428 * transactions.
3429 */
0390131b
FM		 3430 if (sbi->s_journal) {
3431 unlock_super(sb);
3432 ext4_mark_recovery_complete(sb, es);
3433 lock_super(sb);
3434 }
ac27a0ec 3435 } else {
3a06d778 3436 int ret;
617ba13b
MC		 3437 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3438 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3439 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec 3440 "remount RDWR because of unsupported "
3a06d778
AK		 3441 "optional features (%x).\n", sb->s_id,
3442 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
3443 ~EXT4_FEATURE_RO_COMPAT_SUPP));
ac27a0ec
DK		 3444 err = -EROFS;
3445 goto restore_opts;
3446 }
ead6596b 3447
8a266467
TT		 3448 /*
3449 * Make sure the group descriptor checksums
3450 * are sane. If they aren't, refuse to
3451 * remount r/w.
3452 */
3453 for (g = 0; g < sbi->s_groups_count; g++) {
3454 struct ext4_group_desc *gdp =
3455 ext4_get_group_desc(sb, g, NULL);
3456
3457 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3458 printk(KERN_ERR
3459 "EXT4-fs: ext4_remount: "
a9df9a49 3460 "Checksum for group %u failed (%u!=%u)\n",
8a266467
TT		 3461 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3462 le16_to_cpu(gdp->bg_checksum));
3463 err = -EINVAL;
3464 goto restore_opts;
3465 }
3466 }
3467
ead6596b
ES		 3468 /*
3469 * If we have an unprocessed orphan list hanging
3470 * around from a previously readonly bdev mount,
3471 * require a full umount/remount for now.
3472 */
3473 if (es->s_last_orphan) {
3474 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3475 "remount RDWR because of unprocessed "
3476 "orphan inode list. Please "
3477 "umount/remount instead.\n",
3478 sb->s_id);
3479 err = -EINVAL;
3480 goto restore_opts;
3481 }
3482
ac27a0ec
DK		 3483 /*
3484 * Mounting a RDONLY partition read-write, so reread
3485 * and store the current valid flag. (It may have
3486 * been changed by e2fsck since we originally mounted
3487 * the partition.)
3488 */
0390131b
FM		 3489 if (sbi->s_journal)
3490 ext4_clear_journal_err(sb, es);
ac27a0ec 3491 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3492 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3493 goto restore_opts;
2b2d6d01 3494 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3495 sb->s_flags &= ~MS_RDONLY;
3496 }
3497 }
0390131b
FM		 3498 if (sbi->s_journal == NULL)
3499 ext4_commit_super(sb, es, 1);
3500
ac27a0ec
DK		 3501#ifdef CONFIG_QUOTA
3502 /* Release old quota file names */
3503 for (i = 0; i < MAXQUOTAS; i++)
3504 if (old_opts.s_qf_names[i] &&
3505 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3506 kfree(old_opts.s_qf_names[i]);
3507#endif
3508 return 0;
3509restore_opts:
3510 sb->s_flags = old_sb_flags;
3511 sbi->s_mount_opt = old_opts.s_mount_opt;
3512 sbi->s_resuid = old_opts.s_resuid;
3513 sbi->s_resgid = old_opts.s_resgid;
3514 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3515 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3516 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3517#ifdef CONFIG_QUOTA
3518 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3519 for (i = 0; i < MAXQUOTAS; i++) {
3520 if (sbi->s_qf_names[i] &&
3521 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3522 kfree(sbi->s_qf_names[i]);
3523 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3524 }
3525#endif
3526 return err;
3527}
3528
2b2d6d01 3529static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3530{
3531 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3532 struct ext4_sb_info *sbi = EXT4_SB(sb);
3533 struct ext4_super_block *es = sbi->s_es;
960cc398 3534 u64 fsid;
ac27a0ec 3535
5e70030d
BP		 3536 if (test_opt(sb, MINIX_DF)) {
3537 sbi->s_overhead_last = 0;
6bc9feff 3538 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 3539 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 3540 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3541 smp_rmb();
3542
3543 /*
5e70030d
BP		 3544 * Compute the overhead (FS structures). This is constant
3545 * for a given filesystem unless the number of block groups
3546 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3547 */
3548
3549 /*
3550 * All of the blocks before first_data_block are
3551 * overhead
3552 */
3553 overhead = le32_to_cpu(es->s_first_data_block);
3554
3555 /*
3556 * Add the overhead attributed to the superblock and
3557 * block group descriptors. If the sparse superblocks
3558 * feature is turned on, then not all groups have this.
3559 */
3560 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3561 overhead += ext4_bg_has_super(sb, i) +
3562 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3563 cond_resched();
3564 }
3565
3566 /*
3567 * Every block group has an inode bitmap, a block
3568 * bitmap, and an inode table.
3569 */
5e70030d
BP		 3570 overhead += ngroups * (2 + sbi->s_itb_per_group);
3571 sbi->s_overhead_last = overhead;
3572 smp_wmb();
6bc9feff 3573 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3574 }
3575
617ba13b 3576 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3577 buf->f_bsize = sb->s_blocksize;
5e70030d 3578 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3579 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3580 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3581 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3582 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3583 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3584 buf->f_bavail = 0;
3585 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3586 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3587 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3588 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3589 fsid = le64_to_cpup((void *)es->s_uuid) ^
3590 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3591 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3592 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3593 return 0;
3594}
3595
3596/* Helper function for writing quotas on sync - we need to start transaction before quota file
3597 * is locked for write. Otherwise the are possible deadlocks:
3598 * Process 1 Process 2
617ba13b 3599 * ext4_create() quota_sync()
a269eb18
JK		 3600 * jbd2_journal_start() write_dquot()
3601 * vfs_dq_init() down(dqio_mutex)
dab291af 3602 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3603 *
3604 */
3605
3606#ifdef CONFIG_QUOTA
3607
3608static inline struct inode *dquot_to_inode(struct dquot *dquot)
3609{
3610 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3611}
3612
617ba13b 3613static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3614{
3615 int ret, err;
3616 handle_t *handle;
3617 struct inode *inode;
3618
3619 inode = dquot_to_inode(dquot);
617ba13b
MC		 3620 handle = ext4_journal_start(inode,
3621 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3622 if (IS_ERR(handle))
3623 return PTR_ERR(handle);
3624 ret = dquot_commit(dquot);
617ba13b 3625 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3626 if (!ret)
3627 ret = err;
3628 return ret;
3629}
3630
617ba13b 3631static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3632{
3633 int ret, err;
3634 handle_t *handle;
3635
617ba13b
MC		 3636 handle = ext4_journal_start(dquot_to_inode(dquot),
3637 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3638 if (IS_ERR(handle))
3639 return PTR_ERR(handle);
3640 ret = dquot_acquire(dquot);
617ba13b 3641 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3642 if (!ret)
3643 ret = err;
3644 return ret;
3645}
3646
617ba13b 3647static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3648{
3649 int ret, err;
3650 handle_t *handle;
3651
617ba13b
MC		 3652 handle = ext4_journal_start(dquot_to_inode(dquot),
3653 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3654 if (IS_ERR(handle)) {
3655 /* Release dquot anyway to avoid endless cycle in dqput() */
3656 dquot_release(dquot);
ac27a0ec 3657 return PTR_ERR(handle);
9c3013e9 3658 }
ac27a0ec 3659 ret = dquot_release(dquot);
617ba13b 3660 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3661 if (!ret)
3662 ret = err;
3663 return ret;
3664}
3665
617ba13b 3666static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3667{
2c8be6b2 3668 /* Are we journaling quotas? */
617ba13b
MC		 3669 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3670 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3671 dquot_mark_dquot_dirty(dquot);
617ba13b 3672 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3673 } else {
3674 return dquot_mark_dquot_dirty(dquot);
3675 }
3676}
3677
617ba13b 3678static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3679{
3680 int ret, err;
3681 handle_t *handle;
3682
3683 /* Data block + inode block */
617ba13b 3684 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3685 if (IS_ERR(handle))
3686 return PTR_ERR(handle);
3687 ret = dquot_commit_info(sb, type);
617ba13b 3688 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3689 if (!ret)
3690 ret = err;
3691 return ret;
3692}
3693
3694/*
3695 * Turn on quotas during mount time - we need to find
3696 * the quota file and such...
3697 */
617ba13b 3698static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3699{
617ba13b
MC		 3700 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3701 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3702}
3703
3704/*
3705 * Standard function to be called on quota_on
3706 */
617ba13b 3707static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8264613d 3708 char *name, int remount)
ac27a0ec
DK		 3709{
3710 int err;
8264613d 3711 struct path path;
ac27a0ec
DK		 3712
3713 if (!test_opt(sb, QUOTA))
3714 return -EINVAL;
8264613d 3715 /* When remounting, no checks are needed and in fact, name is NULL */
0623543b 3716 if (remount)
8264613d 3717 return vfs_quota_on(sb, type, format_id, name, remount);
0623543b 3718
8264613d 3719 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3720 if (err)
3721 return err;
0623543b 3722
ac27a0ec 3723 /* Quotafile not on the same filesystem? */
8264613d
AV		 3724 if (path.mnt->mnt_sb != sb) {
3725 path_put(&path);
ac27a0ec
DK		 3726 return -EXDEV;
3727 }
0623543b
JK		 3728 /* Journaling quota? */
3729 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3730 /* Quotafile not in fs root? */
8264613d 3731 if (path.dentry->d_parent != sb->s_root)
0623543b
JK		 3732 printk(KERN_WARNING
3733 "EXT4-fs: Quota file not on filesystem root. "
3734 "Journaled quota will not work.\n");
2b2d6d01 3735 }
0623543b
JK		 3736
3737 /*
3738 * When we journal data on quota file, we have to flush journal to see
3739 * all updates to the file when we bypass pagecache...
3740 */
0390131b
FM		 3741 if (EXT4_SB(sb)->s_journal &&
3742 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3743 /*
3744 * We don't need to lock updates but journal_flush() could
3745 * otherwise be livelocked...
3746 */
3747 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3748 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3749 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3750 if (err) {
8264613d 3751 path_put(&path);
7ffe1ea8
HK		 3752 return err;
3753 }
0623543b
JK		 3754 }
3755
8264613d
AV		 3756 err = vfs_quota_on_path(sb, type, format_id, &path);
3757 path_put(&path);
77e69dac 3758 return err;
ac27a0ec
DK		 3759}
3760
3761/* Read data from quotafile - avoid pagecache and such because we cannot afford
3762 * acquiring the locks... As quota files are never truncated and quota code
3763 * itself serializes the operations (and noone else should touch the files)
3764 * we don't have to be afraid of races */
617ba13b 3765static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3766 size_t len, loff_t off)
3767{
3768 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3769 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3770 int err = 0;
3771 int offset = off & (sb->s_blocksize - 1);
3772 int tocopy;
3773 size_t toread;
3774 struct buffer_head *bh;
3775 loff_t i_size = i_size_read(inode);
3776
3777 if (off > i_size)
3778 return 0;
3779 if (off+len > i_size)
3780 len = i_size-off;
3781 toread = len;
3782 while (toread > 0) {
3783 tocopy = sb->s_blocksize - offset < toread ?
3784 sb->s_blocksize - offset : toread;
617ba13b 3785 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3786 if (err)
3787 return err;
3788 if (!bh) /* A hole? */
3789 memset(data, 0, tocopy);
3790 else
3791 memcpy(data, bh->b_data+offset, tocopy);
3792 brelse(bh);
3793 offset = 0;
3794 toread -= tocopy;
3795 data += tocopy;
3796 blk++;
3797 }
3798 return len;
3799}
3800
3801/* Write to quotafile (we know the transaction is already started and has
3802 * enough credits) */
617ba13b 3803static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3804 const char *data, size_t len, loff_t off)
3805{
3806 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3807 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3808 int err = 0;
3809 int offset = off & (sb->s_blocksize - 1);
3810 int tocopy;
617ba13b 3811 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3812 size_t towrite = len;
3813 struct buffer_head *bh;
3814 handle_t *handle = journal_current_handle();
3815
0390131b 3816 if (EXT4_SB(sb)->s_journal && !handle) {
e5f8eab8 3817 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3818 " cancelled because transaction is not started.\n",
3819 (unsigned long long)off, (unsigned long long)len);
3820 return -EIO;
3821 }
ac27a0ec
DK		 3822 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3823 while (towrite > 0) {
3824 tocopy = sb->s_blocksize - offset < towrite ?
3825 sb->s_blocksize - offset : towrite;
617ba13b 3826 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3827 if (!bh)
3828 goto out;
3829 if (journal_quota) {
617ba13b 3830 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3831 if (err) {
3832 brelse(bh);
3833 goto out;
3834 }
3835 }
3836 lock_buffer(bh);
3837 memcpy(bh->b_data+offset, data, tocopy);
3838 flush_dcache_page(bh->b_page);
3839 unlock_buffer(bh);
3840 if (journal_quota)
0390131b 3841 err = ext4_handle_dirty_metadata(handle, NULL, bh);
ac27a0ec
DK		 3842 else {
3843 /* Always do at least ordered writes for quotas */
678aaf48 3844 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3845 mark_buffer_dirty(bh);
3846 }
3847 brelse(bh);
3848 if (err)
3849 goto out;
3850 offset = 0;
3851 towrite -= tocopy;
3852 data += tocopy;
3853 blk++;
3854 }
3855out:
4d04e4fb
JK		 3856 if (len == towrite) {
3857 mutex_unlock(&inode->i_mutex);
ac27a0ec 3858 return err;
4d04e4fb 3859 }
ac27a0ec
DK		 3860 if (inode->i_size < off+len-towrite) {
3861 i_size_write(inode, off+len-towrite);
617ba13b 3862 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3863 }
ac27a0ec 3864 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3865 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3866 mutex_unlock(&inode->i_mutex);
3867 return len - towrite;
3868}
3869
3870#endif
3871
617ba13b 3872static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3873 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3874{
617ba13b 3875 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3876}
3877
03010a33
TT		 3878static struct file_system_type ext4_fs_type = {
3879 .owner = THIS_MODULE,
3880 .name = "ext4",
3881 .get_sb = ext4_get_sb,
3882 .kill_sb = kill_block_super,
3883 .fs_flags = FS_REQUIRES_DEV,
3884};
3885
3886#ifdef CONFIG_EXT4DEV_COMPAT
3887static int ext4dev_get_sb(struct file_system_type *fs_type,
3888 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3889{
3890 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3891 "to mount using ext4\n");
3892 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3893 "will go away by 2.6.31\n");
3894 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3895}
3896
617ba13b 3897static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3898 .owner = THIS_MODULE,
617ba13b 3899 .name = "ext4dev",
03010a33 3900 .get_sb = ext4dev_get_sb,
ac27a0ec
DK		 3901 .kill_sb = kill_block_super,
3902 .fs_flags = FS_REQUIRES_DEV,
3903};
03010a33
TT		 3904MODULE_ALIAS("ext4dev");
3905#endif
ac27a0ec 3906
617ba13b 3907static int __init init_ext4_fs(void)
ac27a0ec 3908{
c9de560d
AT		 3909 int err;
3910
3197ebdb
TT		 3911 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
3912 if (!ext4_kset)
3913 return -ENOMEM;
9f6200bb 3914 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 3915 err = init_ext4_mballoc();
ac27a0ec
DK		 3916 if (err)
3917 return err;
c9de560d
AT		 3918
3919 err = init_ext4_xattr();
3920 if (err)
3921 goto out2;
ac27a0ec
DK		 3922 err = init_inodecache();
3923 if (err)
3924 goto out1;
03010a33 3925 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 3926 if (err)
3927 goto out;
03010a33
TT		 3928#ifdef CONFIG_EXT4DEV_COMPAT
3929 err = register_filesystem(&ext4dev_fs_type);
3930 if (err) {
3931 unregister_filesystem(&ext4_fs_type);
3932 goto out;
3933 }
3934#endif
ac27a0ec
DK		 3935 return 0;
3936out:
3937 destroy_inodecache();
3938out1:
617ba13b 3939 exit_ext4_xattr();
c9de560d
AT		 3940out2:
3941 exit_ext4_mballoc();
ac27a0ec
DK		 3942 return err;
3943}
3944
617ba13b 3945static void __exit exit_ext4_fs(void)
ac27a0ec 3946{
03010a33
TT		 3947 unregister_filesystem(&ext4_fs_type);
3948#ifdef CONFIG_EXT4DEV_COMPAT
617ba13b 3949 unregister_filesystem(&ext4dev_fs_type);
03010a33 3950#endif
ac27a0ec 3951 destroy_inodecache();
617ba13b 3952 exit_ext4_xattr();
c9de560d 3953 exit_ext4_mballoc();
9f6200bb 3954 remove_proc_entry("fs/ext4", NULL);
3197ebdb 3955 kset_unregister(ext4_kset);
ac27a0ec
DK		 3956}
3957
3958MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 3959MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 3960MODULE_LICENSE("GPL");
617ba13b
MC		 3961module_init(init_ext4_fs)
3962module_exit(exit_ext4_fs)
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