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ext4: Avoid printk floods in the face of directory corruption
[net-next-2.6.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
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>
1330593e 37#include <linux/log2.h>
717d50e4 38#include <linux/crc16.h>
ac27a0ec
DK		 39#include <asm/uaccess.h>
40
3dcf5451
CH		 41#include "ext4.h"
42#include "ext4_jbd2.h"
ac27a0ec
DK		 43#include "xattr.h"
44#include "acl.h"
45#include "namei.h"
717d50e4 46#include "group.h"
ac27a0ec 47
617ba13b 48static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 49 unsigned long journal_devnum);
617ba13b 50static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 51 unsigned int);
2b2d6d01
TT		 52static void ext4_commit_super(struct super_block *sb,
53 struct ext4_super_block *es, int sync);
54static void ext4_mark_recovery_complete(struct super_block *sb,
55 struct ext4_super_block *es);
56static void ext4_clear_journal_err(struct super_block *sb,
57 struct ext4_super_block *es);
617ba13b 58static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 59static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 60 char nbuf[16]);
2b2d6d01
TT		 61static int ext4_remount(struct super_block *sb, int *flags, char *data);
62static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
617ba13b 63static void ext4_unlockfs(struct super_block *sb);
2b2d6d01 64static void ext4_write_super(struct super_block *sb);
617ba13b 65static void ext4_write_super_lockfs(struct super_block *sb);
ac27a0ec 66
bd81d8ee 67
8fadc143
AR		 68ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
69 struct ext4_group_desc *bg)
bd81d8ee 70{
3a14589c 71 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 72 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 73 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 74}
75
8fadc143
AR		 76ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
77 struct ext4_group_desc *bg)
bd81d8ee 78{
5272f837 79 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 80 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 81 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 82}
83
8fadc143
AR		 84ext4_fsblk_t ext4_inode_table(struct super_block *sb,
85 struct ext4_group_desc *bg)
bd81d8ee 86{
5272f837 87 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 88 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 89 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 90}
91
8fadc143
AR		 92void ext4_block_bitmap_set(struct super_block *sb,
93 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 94{
3a14589c 95 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 96 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
97 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 98}
99
8fadc143
AR		 100void ext4_inode_bitmap_set(struct super_block *sb,
101 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 102{
5272f837 103 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 104 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
105 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 106}
107
8fadc143
AR		 108void ext4_inode_table_set(struct super_block *sb,
109 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 110{
5272f837 111 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 112 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
113 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 114}
115
ac27a0ec 116/*
dab291af 117 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 118 *
119 * The only special thing we need to do here is to make sure that all
120 * journal_end calls result in the superblock being marked dirty, so
121 * that sync() will call the filesystem's write_super callback if
122 * appropriate.
123 */
617ba13b 124handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 125{
126 journal_t *journal;
127
128 if (sb->s_flags & MS_RDONLY)
129 return ERR_PTR(-EROFS);
130
131 /* Special case here: if the journal has aborted behind our
132 * backs (eg. EIO in the commit thread), then we still need to
133 * take the FS itself readonly cleanly. */
617ba13b 134 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 135 if (is_journal_aborted(journal)) {
46e665e9 136 ext4_abort(sb, __func__,
ac27a0ec
DK		 137 "Detected aborted journal");
138 return ERR_PTR(-EROFS);
139 }
140
dab291af 141 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 142}
143
144/*
145 * The only special thing we need to do here is to make sure that all
dab291af 146 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 147 * that sync() will call the filesystem's write_super callback if
148 * appropriate.
149 */
617ba13b 150int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 151{
152 struct super_block *sb;
153 int err;
154 int rc;
155
156 sb = handle->h_transaction->t_journal->j_private;
157 err = handle->h_err;
dab291af 158 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 159
160 if (!err)
161 err = rc;
162 if (err)
617ba13b 163 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 164 return err;
165}
166
617ba13b 167void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 168 struct buffer_head *bh, handle_t *handle, int err)
169{
170 char nbuf[16];
617ba13b 171 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec
DK		 172
173 if (bh)
174 BUFFER_TRACE(bh, "abort");
175
176 if (!handle->h_err)
177 handle->h_err = err;
178
179 if (is_handle_aborted(handle))
180 return;
181
182 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
183 caller, errstr, err_fn);
184
dab291af 185 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 186}
187
188/* Deal with the reporting of failure conditions on a filesystem such as
189 * inconsistencies detected or read IO failures.
190 *
191 * On ext2, we can store the error state of the filesystem in the
617ba13b 192 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 193 * write ordering constraints on the superblock which prevent us from
194 * writing it out straight away; and given that the journal is about to
195 * be aborted, we can't rely on the current, or future, transactions to
196 * write out the superblock safely.
197 *
dab291af 198 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 199 * the journal instead. On recovery, the journal will compain about
200 * that error until we've noted it down and cleared it.
201 */
202
617ba13b 203static void ext4_handle_error(struct super_block *sb)
ac27a0ec 204{
617ba13b 205 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 206
617ba13b
MC		 207 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
208 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 209
210 if (sb->s_flags & MS_RDONLY)
211 return;
212
2b2d6d01 213 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 214 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 215
617ba13b 216 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 217 if (journal)
dab291af 218 jbd2_journal_abort(journal, -EIO);
ac27a0ec 219 }
2b2d6d01
TT		 220 if (test_opt(sb, ERRORS_RO)) {
221 printk(KERN_CRIT "Remounting filesystem read-only\n");
ac27a0ec
DK		 222 sb->s_flags |= MS_RDONLY;
223 }
617ba13b 224 ext4_commit_super(sb, es, 1);
ac27a0ec 225 if (test_opt(sb, ERRORS_PANIC))
617ba13b 226 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 227 sb->s_id);
228}
229
2b2d6d01
TT		 230void ext4_error(struct super_block *sb, const char *function,
231 const char *fmt, ...)
ac27a0ec
DK		 232{
233 va_list args;
234
235 va_start(args, fmt);
2b2d6d01 236 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 237 vprintk(fmt, args);
238 printk("\n");
239 va_end(args);
240
617ba13b 241 ext4_handle_error(sb);
ac27a0ec
DK		 242}
243
2b2d6d01 244static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 245 char nbuf[16])
246{
247 char *errstr = NULL;
248
249 switch (errno) {
250 case -EIO:
251 errstr = "IO failure";
252 break;
253 case -ENOMEM:
254 errstr = "Out of memory";
255 break;
256 case -EROFS:
dab291af 257 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 258 errstr = "Journal has aborted";
259 else
260 errstr = "Readonly filesystem";
261 break;
262 default:
263 /* If the caller passed in an extra buffer for unknown
264 * errors, textualise them now. Else we just return
265 * NULL. */
266 if (nbuf) {
267 /* Check for truncated error codes... */
268 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
269 errstr = nbuf;
270 }
271 break;
272 }
273
274 return errstr;
275}
276
617ba13b 277/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 278 * automatically and invokes the appropriate error response. */
279
2b2d6d01 280void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 281{
282 char nbuf[16];
283 const char *errstr;
284
285 /* Special case: if the error is EROFS, and we're not already
286 * inside a transaction, then there's really no point in logging
287 * an error. */
288 if (errno == -EROFS && journal_current_handle() == NULL &&
289 (sb->s_flags & MS_RDONLY))
290 return;
291
617ba13b 292 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 293 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
294 sb->s_id, function, errstr);
ac27a0ec 295
617ba13b 296 ext4_handle_error(sb);
ac27a0ec
DK		 297}
298
299/*
617ba13b 300 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 301 * abort function may be used to deal with unrecoverable failures such
302 * as journal IO errors or ENOMEM at a critical moment in log management.
303 *
304 * We unconditionally force the filesystem into an ABORT|READONLY state,
305 * unless the error response on the fs has been set to panic in which
306 * case we take the easy way out and panic immediately.
307 */
308
2b2d6d01
TT		 309void ext4_abort(struct super_block *sb, const char *function,
310 const char *fmt, ...)
ac27a0ec
DK		 311{
312 va_list args;
313
2b2d6d01 314 printk(KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 315
316 va_start(args, fmt);
2b2d6d01 317 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 318 vprintk(fmt, args);
319 printk("\n");
320 va_end(args);
321
322 if (test_opt(sb, ERRORS_PANIC))
617ba13b 323 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 324
325 if (sb->s_flags & MS_RDONLY)
326 return;
327
328 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 329 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 330 sb->s_flags |= MS_RDONLY;
617ba13b 331 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
dab291af 332 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 333}
334
2b2d6d01
TT		 335void ext4_warning(struct super_block *sb, const char *function,
336 const char *fmt, ...)
ac27a0ec
DK		 337{
338 va_list args;
339
340 va_start(args, fmt);
617ba13b 341 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 342 sb->s_id, function);
343 vprintk(fmt, args);
344 printk("\n");
345 va_end(args);
346}
347
617ba13b 348void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 349{
617ba13b 350 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 351
617ba13b 352 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 353 return;
354
46e665e9 355 ext4_warning(sb, __func__,
ac27a0ec
DK		 356 "updating to rev %d because of new feature flag, "
357 "running e2fsck is recommended",
617ba13b 358 EXT4_DYNAMIC_REV);
ac27a0ec 359
617ba13b
MC		 360 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
361 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
362 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 363 /* leave es->s_feature_*compat flags alone */
364 /* es->s_uuid will be set by e2fsck if empty */
365
366 /*
367 * The rest of the superblock fields should be zero, and if not it
368 * means they are likely already in use, so leave them alone. We
369 * can leave it up to e2fsck to clean up any inconsistencies there.
370 */
371}
372
99e6f829
AK		 373int ext4_update_compat_feature(handle_t *handle,
374 struct super_block *sb, __u32 compat)
375{
376 int err = 0;
377 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
378 err = ext4_journal_get_write_access(handle,
379 EXT4_SB(sb)->s_sbh);
380 if (err)
381 return err;
382 EXT4_SET_COMPAT_FEATURE(sb, compat);
383 sb->s_dirt = 1;
384 handle->h_sync = 1;
385 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
386 "call ext4_journal_dirty_met adata");
387 err = ext4_journal_dirty_metadata(handle,
388 EXT4_SB(sb)->s_sbh);
389 }
390 return err;
391}
392
393int ext4_update_rocompat_feature(handle_t *handle,
394 struct super_block *sb, __u32 rocompat)
395{
396 int err = 0;
397 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
398 err = ext4_journal_get_write_access(handle,
399 EXT4_SB(sb)->s_sbh);
400 if (err)
401 return err;
402 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
403 sb->s_dirt = 1;
404 handle->h_sync = 1;
405 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
406 "call ext4_journal_dirty_met adata");
407 err = ext4_journal_dirty_metadata(handle,
408 EXT4_SB(sb)->s_sbh);
409 }
410 return err;
411}
412
413int ext4_update_incompat_feature(handle_t *handle,
414 struct super_block *sb, __u32 incompat)
415{
416 int err = 0;
417 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
418 err = ext4_journal_get_write_access(handle,
419 EXT4_SB(sb)->s_sbh);
420 if (err)
421 return err;
422 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
423 sb->s_dirt = 1;
424 handle->h_sync = 1;
425 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
426 "call ext4_journal_dirty_met adata");
427 err = ext4_journal_dirty_metadata(handle,
428 EXT4_SB(sb)->s_sbh);
429 }
430 return err;
431}
432
ac27a0ec
DK		 433/*
434 * Open the external journal device
435 */
617ba13b 436static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 437{
438 struct block_device *bdev;
439 char b[BDEVNAME_SIZE];
440
441 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
442 if (IS_ERR(bdev))
443 goto fail;
444 return bdev;
445
446fail:
617ba13b 447 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 448 __bdevname(dev, b), PTR_ERR(bdev));
449 return NULL;
450}
451
452/*
453 * Release the journal device
454 */
617ba13b 455static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 456{
457 bd_release(bdev);
458 return blkdev_put(bdev);
459}
460
617ba13b 461static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 462{
463 struct block_device *bdev;
464 int ret = -ENODEV;
465
466 bdev = sbi->journal_bdev;
467 if (bdev) {
617ba13b 468 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 469 sbi->journal_bdev = NULL;
470 }
471 return ret;
472}
473
474static inline struct inode *orphan_list_entry(struct list_head *l)
475{
617ba13b 476 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 477}
478
617ba13b 479static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 480{
481 struct list_head *l;
482
483 printk(KERN_ERR "sb orphan head is %d\n",
484 le32_to_cpu(sbi->s_es->s_last_orphan));
485
486 printk(KERN_ERR "sb_info orphan list:\n");
487 list_for_each(l, &sbi->s_orphan) {
488 struct inode *inode = orphan_list_entry(l);
489 printk(KERN_ERR " "
490 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
491 inode->i_sb->s_id, inode->i_ino, inode,
492 inode->i_mode, inode->i_nlink,
493 NEXT_ORPHAN(inode));
494 }
495}
496
2b2d6d01 497static void ext4_put_super(struct super_block *sb)
ac27a0ec 498{
617ba13b
MC		 499 struct ext4_sb_info *sbi = EXT4_SB(sb);
500 struct ext4_super_block *es = sbi->s_es;
ac27a0ec
DK		 501 int i;
502
c9de560d 503 ext4_mb_release(sb);
a86c6181 504 ext4_ext_release(sb);
617ba13b 505 ext4_xattr_put_super(sb);
dab291af 506 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 507 sbi->s_journal = NULL;
ac27a0ec 508 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 509 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec
DK		 510 es->s_state = cpu_to_le16(sbi->s_mount_state);
511 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
512 mark_buffer_dirty(sbi->s_sbh);
617ba13b 513 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 514 }
515
516 for (i = 0; i < sbi->s_gdb_count; i++)
517 brelse(sbi->s_group_desc[i]);
518 kfree(sbi->s_group_desc);
772cb7c8 519 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 520 percpu_counter_destroy(&sbi->s_freeblocks_counter);
521 percpu_counter_destroy(&sbi->s_freeinodes_counter);
522 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 523 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 524 brelse(sbi->s_sbh);
525#ifdef CONFIG_QUOTA
526 for (i = 0; i < MAXQUOTAS; i++)
527 kfree(sbi->s_qf_names[i]);
528#endif
529
530 /* Debugging code just in case the in-memory inode orphan list
531 * isn't empty. The on-disk one can be non-empty if we've
532 * detected an error and taken the fs readonly, but the
533 * in-memory list had better be clean by this point. */
534 if (!list_empty(&sbi->s_orphan))
535 dump_orphan_list(sb, sbi);
536 J_ASSERT(list_empty(&sbi->s_orphan));
537
f98393a6 538 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 539 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
540 /*
541 * Invalidate the journal device's buffers. We don't want them
542 * floating about in memory - the physical journal device may
543 * hotswapped, and it breaks the `ro-after' testing code.
544 */
545 sync_blockdev(sbi->journal_bdev);
f98393a6 546 invalidate_bdev(sbi->journal_bdev);
617ba13b 547 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 548 }
549 sb->s_fs_info = NULL;
550 kfree(sbi);
551 return;
552}
553
e18b890b 554static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 555
556/*
557 * Called inside transaction, so use GFP_NOFS
558 */
617ba13b 559static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 560{
617ba13b 561 struct ext4_inode_info *ei;
ac27a0ec 562
e6b4f8da 563 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 564 if (!ei)
565 return NULL;
617ba13b
MC		 566#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
567 ei->i_acl = EXT4_ACL_NOT_CACHED;
568 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 569#endif
570 ei->i_block_alloc_info = NULL;
571 ei->vfs_inode.i_version = 1;
91246c00 572 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 573 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 574 INIT_LIST_HEAD(&ei->i_prealloc_list);
575 spin_lock_init(&ei->i_prealloc_lock);
678aaf48 576 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 577 ei->i_reserved_data_blocks = 0;
578 ei->i_reserved_meta_blocks = 0;
579 ei->i_allocated_meta_blocks = 0;
580 ei->i_delalloc_reserved_flag = 0;
581 spin_lock_init(&(ei->i_block_reservation_lock));
ac27a0ec
DK		 582 return &ei->vfs_inode;
583}
584
617ba13b 585static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 586{
9f7dd93d
VA		 587 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
588 printk("EXT4 Inode %p: orphan list check failed!\n",
589 EXT4_I(inode));
590 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
591 EXT4_I(inode), sizeof(struct ext4_inode_info),
592 true);
593 dump_stack();
594 }
617ba13b 595 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 596}
597
51cc5068 598static void init_once(void *foo)
ac27a0ec 599{
617ba13b 600 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 601
a35afb83 602 INIT_LIST_HEAD(&ei->i_orphan);
617ba13b 603#ifdef CONFIG_EXT4DEV_FS_XATTR
a35afb83 604 init_rwsem(&ei->xattr_sem);
ac27a0ec 605#endif
0e855ac8 606 init_rwsem(&ei->i_data_sem);
a35afb83 607 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 608}
609
610static int init_inodecache(void)
611{
617ba13b
MC		 612 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
613 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 614 0, (SLAB_RECLAIM_ACCOUNT|
615 SLAB_MEM_SPREAD),
20c2df83 616 init_once);
617ba13b 617 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 618 return -ENOMEM;
619 return 0;
620}
621
622static void destroy_inodecache(void)
623{
617ba13b 624 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 625}
626
617ba13b 627static void ext4_clear_inode(struct inode *inode)
ac27a0ec 628{
617ba13b
MC		 629 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
630#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
631 if (EXT4_I(inode)->i_acl &&
632 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
633 posix_acl_release(EXT4_I(inode)->i_acl);
634 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
635 }
636 if (EXT4_I(inode)->i_default_acl &&
637 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
638 posix_acl_release(EXT4_I(inode)->i_default_acl);
639 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 640 }
641#endif
617ba13b
MC		 642 ext4_discard_reservation(inode);
643 EXT4_I(inode)->i_block_alloc_info = NULL;
ac27a0ec
DK		 644 if (unlikely(rsv))
645 kfree(rsv);
678aaf48
JK		 646 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
647 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 648}
649
2b2d6d01
TT		 650static inline void ext4_show_quota_options(struct seq_file *seq,
651 struct super_block *sb)
ac27a0ec
DK		 652{
653#if defined(CONFIG_QUOTA)
617ba13b 654 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 655
656 if (sbi->s_jquota_fmt)
657 seq_printf(seq, ",jqfmt=%s",
af5bc92d 658 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 659
660 if (sbi->s_qf_names[USRQUOTA])
661 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
662
663 if (sbi->s_qf_names[GRPQUOTA])
664 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
665
617ba13b 666 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 667 seq_puts(seq, ",usrquota");
668
617ba13b 669 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 670 seq_puts(seq, ",grpquota");
671#endif
672}
673
d9c9bef1
MS		 674/*
675 * Show an option if
676 * - it's set to a non-default value OR
677 * - if the per-sb default is different from the global default
678 */
617ba13b 679static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 680{
aa22df2c
AK		 681 int def_errors;
682 unsigned long def_mount_opts;
ac27a0ec 683 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 684 struct ext4_sb_info *sbi = EXT4_SB(sb);
685 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 686
687 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 688 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 689
690 if (sbi->s_sb_block != 1)
691 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
692 if (test_opt(sb, MINIX_DF))
693 seq_puts(seq, ",minixdf");
aa22df2c 694 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 695 seq_puts(seq, ",grpid");
696 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
697 seq_puts(seq, ",nogrpid");
698 if (sbi->s_resuid != EXT4_DEF_RESUID ||
699 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
700 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
701 }
702 if (sbi->s_resgid != EXT4_DEF_RESGID ||
703 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
704 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
705 }
bb4f397a 706 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 707 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 708 def_errors == EXT4_ERRORS_CONTINUE) {
709 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 710 }
711 }
aa22df2c 712 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 713 seq_puts(seq, ",errors=continue");
aa22df2c 714 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 715 seq_puts(seq, ",errors=panic");
aa22df2c 716 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 717 seq_puts(seq, ",nouid32");
aa22df2c 718 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 719 seq_puts(seq, ",debug");
720 if (test_opt(sb, OLDALLOC))
721 seq_puts(seq, ",oldalloc");
07620f69 722#ifdef CONFIG_EXT4DEV_FS_XATTR
aa22df2c
AK		 723 if (test_opt(sb, XATTR_USER) &&
724 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 725 seq_puts(seq, ",user_xattr");
726 if (!test_opt(sb, XATTR_USER) &&
727 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
728 seq_puts(seq, ",nouser_xattr");
729 }
730#endif
07620f69 731#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
aa22df2c 732 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 733 seq_puts(seq, ",acl");
734 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
735 seq_puts(seq, ",noacl");
736#endif
737 if (!test_opt(sb, RESERVATION))
738 seq_puts(seq, ",noreservation");
739 if (sbi->s_commit_interval) {
740 seq_printf(seq, ",commit=%u",
741 (unsigned) (sbi->s_commit_interval / HZ));
742 }
571640ca
ES		 743 /*
744 * We're changing the default of barrier mount option, so
745 * let's always display its mount state so it's clear what its
746 * status is.
747 */
748 seq_puts(seq, ",barrier=");
749 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 750 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
751 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 752 if (test_opt(sb, NOBH))
753 seq_puts(seq, ",nobh");
754 if (!test_opt(sb, EXTENTS))
755 seq_puts(seq, ",noextents");
3dbd0ede
AK		 756 if (!test_opt(sb, MBALLOC))
757 seq_puts(seq, ",nomballoc");
25ec56b5
JNC		 758 if (test_opt(sb, I_VERSION))
759 seq_puts(seq, ",i_version");
dd919b98
AK		 760 if (!test_opt(sb, DELALLOC))
761 seq_puts(seq, ",nodelalloc");
762
ac27a0ec 763
cb45bbe4
MS		 764 if (sbi->s_stripe)
765 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 766 /*
767 * journal mode get enabled in different ways
768 * So just print the value even if we didn't specify it
769 */
617ba13b 770 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 771 seq_puts(seq, ",data=journal");
617ba13b 772 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 773 seq_puts(seq, ",data=ordered");
617ba13b 774 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 775 seq_puts(seq, ",data=writeback");
776
617ba13b 777 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 778 return 0;
779}
780
781
1b961ac0
CH		 782static struct inode *ext4_nfs_get_inode(struct super_block *sb,
783 u64 ino, u32 generation)
ac27a0ec 784{
ac27a0ec 785 struct inode *inode;
ac27a0ec 786
617ba13b 787 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 788 return ERR_PTR(-ESTALE);
617ba13b 789 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 790 return ERR_PTR(-ESTALE);
791
792 /* iget isn't really right if the inode is currently unallocated!!
793 *
617ba13b 794 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 795 * deleted, so we should be safe.
796 *
797 * Currently we don't know the generation for parent directory, so
798 * a generation of 0 means "accept any"
799 */
1d1fe1ee
DH		 800 inode = ext4_iget(sb, ino);
801 if (IS_ERR(inode))
802 return ERR_CAST(inode);
803 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 804 iput(inode);
805 return ERR_PTR(-ESTALE);
806 }
1b961ac0
CH		 807
808 return inode;
809}
810
811static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
812 int fh_len, int fh_type)
813{
814 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
815 ext4_nfs_get_inode);
816}
817
818static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
819 int fh_len, int fh_type)
820{
821 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
822 ext4_nfs_get_inode);
ac27a0ec
DK		 823}
824
825#ifdef CONFIG_QUOTA
af5bc92d 826#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 827#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 828
617ba13b
MC		 829static int ext4_dquot_initialize(struct inode *inode, int type);
830static int ext4_dquot_drop(struct inode *inode);
831static int ext4_write_dquot(struct dquot *dquot);
832static int ext4_acquire_dquot(struct dquot *dquot);
833static int ext4_release_dquot(struct dquot *dquot);
834static int ext4_mark_dquot_dirty(struct dquot *dquot);
835static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 836static int ext4_quota_on(struct super_block *sb, int type, int format_id,
837 char *path, int remount);
617ba13b
MC		 838static int ext4_quota_on_mount(struct super_block *sb, int type);
839static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 840 size_t len, loff_t off);
617ba13b 841static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 842 const char *data, size_t len, loff_t off);
843
617ba13b
MC		 844static struct dquot_operations ext4_quota_operations = {
845 .initialize = ext4_dquot_initialize,
846 .drop = ext4_dquot_drop,
ac27a0ec
DK		 847 .alloc_space = dquot_alloc_space,
848 .alloc_inode = dquot_alloc_inode,
849 .free_space = dquot_free_space,
850 .free_inode = dquot_free_inode,
851 .transfer = dquot_transfer,
617ba13b
MC		 852 .write_dquot = ext4_write_dquot,
853 .acquire_dquot = ext4_acquire_dquot,
854 .release_dquot = ext4_release_dquot,
855 .mark_dirty = ext4_mark_dquot_dirty,
856 .write_info = ext4_write_info
ac27a0ec
DK		 857};
858
617ba13b
MC		 859static struct quotactl_ops ext4_qctl_operations = {
860 .quota_on = ext4_quota_on,
ac27a0ec
DK		 861 .quota_off = vfs_quota_off,
862 .quota_sync = vfs_quota_sync,
863 .get_info = vfs_get_dqinfo,
864 .set_info = vfs_set_dqinfo,
865 .get_dqblk = vfs_get_dqblk,
866 .set_dqblk = vfs_set_dqblk
867};
868#endif
869
ee9b6d61 870static const struct super_operations ext4_sops = {
617ba13b
MC		 871 .alloc_inode = ext4_alloc_inode,
872 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 873 .write_inode = ext4_write_inode,
874 .dirty_inode = ext4_dirty_inode,
875 .delete_inode = ext4_delete_inode,
876 .put_super = ext4_put_super,
877 .write_super = ext4_write_super,
878 .sync_fs = ext4_sync_fs,
879 .write_super_lockfs = ext4_write_super_lockfs,
880 .unlockfs = ext4_unlockfs,
881 .statfs = ext4_statfs,
882 .remount_fs = ext4_remount,
883 .clear_inode = ext4_clear_inode,
884 .show_options = ext4_show_options,
ac27a0ec 885#ifdef CONFIG_QUOTA
617ba13b
MC		 886 .quota_read = ext4_quota_read,
887 .quota_write = ext4_quota_write,
ac27a0ec
DK		 888#endif
889};
890
39655164 891static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 892 .fh_to_dentry = ext4_fh_to_dentry,
893 .fh_to_parent = ext4_fh_to_parent,
617ba13b 894 .get_parent = ext4_get_parent,
ac27a0ec
DK		 895};
896
897enum {
898 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
899 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
900 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
901 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
902 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
903 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 904 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec
DK		 905 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
906 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
907 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
908 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 909 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
dd919b98 910 Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
ac27a0ec
DK		 911};
912
913static match_table_t tokens = {
914 {Opt_bsd_df, "bsddf"},
915 {Opt_minix_df, "minixdf"},
916 {Opt_grpid, "grpid"},
917 {Opt_grpid, "bsdgroups"},
918 {Opt_nogrpid, "nogrpid"},
919 {Opt_nogrpid, "sysvgroups"},
920 {Opt_resgid, "resgid=%u"},
921 {Opt_resuid, "resuid=%u"},
922 {Opt_sb, "sb=%u"},
923 {Opt_err_cont, "errors=continue"},
924 {Opt_err_panic, "errors=panic"},
925 {Opt_err_ro, "errors=remount-ro"},
926 {Opt_nouid32, "nouid32"},
927 {Opt_nocheck, "nocheck"},
928 {Opt_nocheck, "check=none"},
929 {Opt_debug, "debug"},
930 {Opt_oldalloc, "oldalloc"},
931 {Opt_orlov, "orlov"},
932 {Opt_user_xattr, "user_xattr"},
933 {Opt_nouser_xattr, "nouser_xattr"},
934 {Opt_acl, "acl"},
935 {Opt_noacl, "noacl"},
936 {Opt_reservation, "reservation"},
937 {Opt_noreservation, "noreservation"},
938 {Opt_noload, "noload"},
939 {Opt_nobh, "nobh"},
940 {Opt_bh, "bh"},
941 {Opt_commit, "commit=%u"},
942 {Opt_journal_update, "journal=update"},
943 {Opt_journal_inum, "journal=%u"},
944 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 945 {Opt_journal_checksum, "journal_checksum"},
946 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 947 {Opt_abort, "abort"},
948 {Opt_data_journal, "data=journal"},
949 {Opt_data_ordered, "data=ordered"},
950 {Opt_data_writeback, "data=writeback"},
951 {Opt_offusrjquota, "usrjquota="},
952 {Opt_usrjquota, "usrjquota=%s"},
953 {Opt_offgrpjquota, "grpjquota="},
954 {Opt_grpjquota, "grpjquota=%s"},
955 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
956 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
957 {Opt_grpquota, "grpquota"},
958 {Opt_noquota, "noquota"},
959 {Opt_quota, "quota"},
960 {Opt_usrquota, "usrquota"},
961 {Opt_barrier, "barrier=%u"},
a86c6181 962 {Opt_extents, "extents"},
1e2462f9 963 {Opt_noextents, "noextents"},
25ec56b5 964 {Opt_i_version, "i_version"},
c9de560d
AT		 965 {Opt_mballoc, "mballoc"},
966 {Opt_nomballoc, "nomballoc"},
967 {Opt_stripe, "stripe=%u"},
ac27a0ec 968 {Opt_resize, "resize"},
64769240 969 {Opt_delalloc, "delalloc"},
dd919b98 970 {Opt_nodelalloc, "nodelalloc"},
f3f12faa 971 {Opt_err, NULL},
ac27a0ec
DK		 972};
973
617ba13b 974static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 975{
617ba13b 976 ext4_fsblk_t sb_block;
ac27a0ec
DK		 977 char *options = (char *) *data;
978
979 if (!options || strncmp(options, "sb=", 3) != 0)
980 return 1; /* Default location */
981 options += 3;
617ba13b 982 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 983 sb_block = simple_strtoul(options, &options, 0);
984 if (*options && *options != ',') {
4776004f 985 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 986 (char *) *data);
987 return 1;
988 }
989 if (*options == ',')
990 options++;
991 *data = (void *) options;
992 return sb_block;
993}
994
2b2d6d01
TT		 995static int parse_options(char *options, struct super_block *sb,
996 unsigned int *inum, unsigned long *journal_devnum,
997 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 998{
617ba13b 999 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1000 char *p;
ac27a0ec
DK		 1001 substring_t args[MAX_OPT_ARGS];
1002 int data_opt = 0;
1003 int option;
1004#ifdef CONFIG_QUOTA
dfc5d03f 1005 int qtype, qfmt;
ac27a0ec
DK		 1006 char *qname;
1007#endif
c07651b5 1008 ext4_fsblk_t last_block;
ac27a0ec
DK		 1009
1010 if (!options)
1011 return 1;
1012
2b2d6d01 1013 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1014 int token;
1015 if (!*p)
1016 continue;
1017
1018 token = match_token(p, tokens, args);
1019 switch (token) {
1020 case Opt_bsd_df:
2b2d6d01 1021 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1022 break;
1023 case Opt_minix_df:
2b2d6d01 1024 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1025 break;
1026 case Opt_grpid:
2b2d6d01 1027 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1028 break;
1029 case Opt_nogrpid:
2b2d6d01 1030 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1031 break;
1032 case Opt_resuid:
1033 if (match_int(&args[0], &option))
1034 return 0;
1035 sbi->s_resuid = option;
1036 break;
1037 case Opt_resgid:
1038 if (match_int(&args[0], &option))
1039 return 0;
1040 sbi->s_resgid = option;
1041 break;
1042 case Opt_sb:
1043 /* handled by get_sb_block() instead of here */
1044 /* *sb_block = match_int(&args[0]); */
1045 break;
1046 case Opt_err_panic:
2b2d6d01
TT		 1047 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1048 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1049 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1050 break;
1051 case Opt_err_ro:
2b2d6d01
TT		 1052 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1053 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1054 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1055 break;
1056 case Opt_err_cont:
2b2d6d01
TT		 1057 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1058 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1059 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1060 break;
1061 case Opt_nouid32:
2b2d6d01 1062 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec
DK		 1063 break;
1064 case Opt_nocheck:
2b2d6d01 1065 clear_opt(sbi->s_mount_opt, CHECK);
ac27a0ec
DK		 1066 break;
1067 case Opt_debug:
2b2d6d01 1068 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1069 break;
1070 case Opt_oldalloc:
2b2d6d01 1071 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1072 break;
1073 case Opt_orlov:
2b2d6d01 1074 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1075 break;
617ba13b 1076#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec 1077 case Opt_user_xattr:
2b2d6d01 1078 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1079 break;
1080 case Opt_nouser_xattr:
2b2d6d01 1081 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1082 break;
1083#else
1084 case Opt_user_xattr:
1085 case Opt_nouser_xattr:
4776004f
TT		 1086 printk(KERN_ERR "EXT4 (no)user_xattr options "
1087 "not supported\n");
ac27a0ec
DK		 1088 break;
1089#endif
617ba13b 1090#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK		 1091 case Opt_acl:
1092 set_opt(sbi->s_mount_opt, POSIX_ACL);
1093 break;
1094 case Opt_noacl:
1095 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1096 break;
1097#else
1098 case Opt_acl:
1099 case Opt_noacl:
4776004f
TT		 1100 printk(KERN_ERR "EXT4 (no)acl options "
1101 "not supported\n");
ac27a0ec
DK		 1102 break;
1103#endif
1104 case Opt_reservation:
1105 set_opt(sbi->s_mount_opt, RESERVATION);
1106 break;
1107 case Opt_noreservation:
1108 clear_opt(sbi->s_mount_opt, RESERVATION);
1109 break;
1110 case Opt_journal_update:
1111 /* @@@ FIXME */
1112 /* Eventually we will want to be able to create
1113 a journal file here. For now, only allow the
1114 user to specify an existing inode to be the
1115 journal file. */
1116 if (is_remount) {
617ba13b 1117 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1118 "journal on remount\n");
1119 return 0;
1120 }
2b2d6d01 1121 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec
DK		 1122 break;
1123 case Opt_journal_inum:
1124 if (is_remount) {
617ba13b 1125 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1126 "journal on remount\n");
1127 return 0;
1128 }
1129 if (match_int(&args[0], &option))
1130 return 0;
1131 *inum = option;
1132 break;
1133 case Opt_journal_dev:
1134 if (is_remount) {
617ba13b 1135 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1136 "journal on remount\n");
1137 return 0;
1138 }
1139 if (match_int(&args[0], &option))
1140 return 0;
1141 *journal_devnum = option;
1142 break;
818d276c
GS		 1143 case Opt_journal_checksum:
1144 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1145 break;
1146 case Opt_journal_async_commit:
1147 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1148 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1149 break;
ac27a0ec 1150 case Opt_noload:
2b2d6d01 1151 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1152 break;
1153 case Opt_commit:
1154 if (match_int(&args[0], &option))
1155 return 0;
1156 if (option < 0)
1157 return 0;
1158 if (option == 0)
cd02ff0b 1159 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1160 sbi->s_commit_interval = HZ * option;
1161 break;
1162 case Opt_data_journal:
617ba13b 1163 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1164 goto datacheck;
1165 case Opt_data_ordered:
617ba13b 1166 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1167 goto datacheck;
1168 case Opt_data_writeback:
617ba13b 1169 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1170 datacheck:
1171 if (is_remount) {
617ba13b 1172 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1173 != data_opt) {
1174 printk(KERN_ERR
617ba13b 1175 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1176 "mode on remount\n");
1177 return 0;
1178 }
1179 } else {
617ba13b 1180 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1181 sbi->s_mount_opt |= data_opt;
1182 }
1183 break;
1184#ifdef CONFIG_QUOTA
1185 case Opt_usrjquota:
1186 qtype = USRQUOTA;
1187 goto set_qf_name;
1188 case Opt_grpjquota:
1189 qtype = GRPQUOTA;
1190set_qf_name:
dfc5d03f
JK		 1191 if ((sb_any_quota_enabled(sb) ||
1192 sb_any_quota_suspended(sb)) &&
1193 !sbi->s_qf_names[qtype]) {
ac27a0ec 1194 printk(KERN_ERR
4776004f
TT		 1195 "EXT4-fs: Cannot change journaled "
1196 "quota options when quota turned on.\n");
ac27a0ec
DK		 1197 return 0;
1198 }
1199 qname = match_strdup(&args[0]);
1200 if (!qname) {
1201 printk(KERN_ERR
617ba13b 1202 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1203 "storing quotafile name.\n");
1204 return 0;
1205 }
1206 if (sbi->s_qf_names[qtype] &&
1207 strcmp(sbi->s_qf_names[qtype], qname)) {
1208 printk(KERN_ERR
617ba13b 1209 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1210 "specified.\n", QTYPE2NAME(qtype));
1211 kfree(qname);
1212 return 0;
1213 }
1214 sbi->s_qf_names[qtype] = qname;
1215 if (strchr(sbi->s_qf_names[qtype], '/')) {
1216 printk(KERN_ERR
617ba13b 1217 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1218 "filesystem root.\n");
1219 kfree(sbi->s_qf_names[qtype]);
1220 sbi->s_qf_names[qtype] = NULL;
1221 return 0;
1222 }
1223 set_opt(sbi->s_mount_opt, QUOTA);
1224 break;
1225 case Opt_offusrjquota:
1226 qtype = USRQUOTA;
1227 goto clear_qf_name;
1228 case Opt_offgrpjquota:
1229 qtype = GRPQUOTA;
1230clear_qf_name:
dfc5d03f
JK		 1231 if ((sb_any_quota_enabled(sb) ||
1232 sb_any_quota_suspended(sb)) &&
1233 sbi->s_qf_names[qtype]) {
617ba13b 1234 printk(KERN_ERR "EXT4-fs: Cannot change "
2c8be6b2 1235 "journaled quota options when "
ac27a0ec
DK		 1236 "quota turned on.\n");
1237 return 0;
1238 }
1239 /*
1240 * The space will be released later when all options
1241 * are confirmed to be correct
1242 */
1243 sbi->s_qf_names[qtype] = NULL;
1244 break;
1245 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1246 qfmt = QFMT_VFS_OLD;
1247 goto set_qf_format;
ac27a0ec 1248 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1249 qfmt = QFMT_VFS_V0;
1250set_qf_format:
1251 if ((sb_any_quota_enabled(sb) ||
1252 sb_any_quota_suspended(sb)) &&
1253 sbi->s_jquota_fmt != qfmt) {
1254 printk(KERN_ERR "EXT4-fs: Cannot change "
1255 "journaled quota options when "
1256 "quota turned on.\n");
1257 return 0;
1258 }
1259 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1260 break;
1261 case Opt_quota:
1262 case Opt_usrquota:
1263 set_opt(sbi->s_mount_opt, QUOTA);
1264 set_opt(sbi->s_mount_opt, USRQUOTA);
1265 break;
1266 case Opt_grpquota:
1267 set_opt(sbi->s_mount_opt, QUOTA);
1268 set_opt(sbi->s_mount_opt, GRPQUOTA);
1269 break;
1270 case Opt_noquota:
1271 if (sb_any_quota_enabled(sb)) {
617ba13b 1272 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1273 "options when quota turned on.\n");
1274 return 0;
1275 }
1276 clear_opt(sbi->s_mount_opt, QUOTA);
1277 clear_opt(sbi->s_mount_opt, USRQUOTA);
1278 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1279 break;
1280#else
1281 case Opt_quota:
1282 case Opt_usrquota:
1283 case Opt_grpquota:
cd59e7b9
JK		 1284 printk(KERN_ERR
1285 "EXT4-fs: quota options not supported.\n");
1286 break;
ac27a0ec
DK		 1287 case Opt_usrjquota:
1288 case Opt_grpjquota:
1289 case Opt_offusrjquota:
1290 case Opt_offgrpjquota:
1291 case Opt_jqfmt_vfsold:
1292 case Opt_jqfmt_vfsv0:
1293 printk(KERN_ERR
cd59e7b9 1294 "EXT4-fs: journaled quota options not "
ac27a0ec
DK		 1295 "supported.\n");
1296 break;
1297 case Opt_noquota:
1298 break;
1299#endif
1300 case Opt_abort:
1301 set_opt(sbi->s_mount_opt, ABORT);
1302 break;
1303 case Opt_barrier:
1304 if (match_int(&args[0], &option))
1305 return 0;
1306 if (option)
1307 set_opt(sbi->s_mount_opt, BARRIER);
1308 else
1309 clear_opt(sbi->s_mount_opt, BARRIER);
1310 break;
1311 case Opt_ignore:
1312 break;
1313 case Opt_resize:
1314 if (!is_remount) {
617ba13b 1315 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1316 "for remount\n");
1317 return 0;
1318 }
1319 if (match_int(&args[0], &option) != 0)
1320 return 0;
1321 *n_blocks_count = option;
1322 break;
1323 case Opt_nobh:
1324 set_opt(sbi->s_mount_opt, NOBH);
1325 break;
1326 case Opt_bh:
1327 clear_opt(sbi->s_mount_opt, NOBH);
1328 break;
a86c6181 1329 case Opt_extents:
e4079a11
ES		 1330 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1331 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1332 ext4_warning(sb, __func__,
1333 "extents feature not enabled "
1334 "on this filesystem, use tune2fs\n");
1335 return 0;
1336 }
2b2d6d01 1337 set_opt(sbi->s_mount_opt, EXTENTS);
a86c6181 1338 break;
1e2462f9 1339 case Opt_noextents:
c07651b5
AK		 1340 /*
1341 * When e2fsprogs support resizing an already existing
1342 * ext3 file system to greater than 2**32 we need to
1343 * add support to block allocator to handle growing
1344 * already existing block mapped inode so that blocks
1345 * allocated for them fall within 2**32
1346 */
1347 last_block = ext4_blocks_count(sbi->s_es) - 1;
1348 if (last_block > 0xffffffffULL) {
1349 printk(KERN_ERR "EXT4-fs: Filesystem too "
1350 "large to mount with "
1351 "-o noextents options\n");
1352 return 0;
1353 }
2b2d6d01 1354 clear_opt(sbi->s_mount_opt, EXTENTS);
1e2462f9 1355 break;
25ec56b5
JNC		 1356 case Opt_i_version:
1357 set_opt(sbi->s_mount_opt, I_VERSION);
1358 sb->s_flags |= MS_I_VERSION;
1359 break;
dd919b98
AK		 1360 case Opt_nodelalloc:
1361 clear_opt(sbi->s_mount_opt, DELALLOC);
1362 break;
c9de560d
AT		 1363 case Opt_mballoc:
1364 set_opt(sbi->s_mount_opt, MBALLOC);
1365 break;
1366 case Opt_nomballoc:
1367 clear_opt(sbi->s_mount_opt, MBALLOC);
1368 break;
1369 case Opt_stripe:
1370 if (match_int(&args[0], &option))
1371 return 0;
1372 if (option < 0)
1373 return 0;
1374 sbi->s_stripe = option;
1375 break;
64769240
AT		 1376 case Opt_delalloc:
1377 set_opt(sbi->s_mount_opt, DELALLOC);
1378 break;
ac27a0ec 1379 default:
2b2d6d01
TT		 1380 printk(KERN_ERR
1381 "EXT4-fs: Unrecognized mount option \"%s\" "
1382 "or missing value\n", p);
ac27a0ec
DK		 1383 return 0;
1384 }
1385 }
1386#ifdef CONFIG_QUOTA
1387 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1388 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1389 sbi->s_qf_names[USRQUOTA])
1390 clear_opt(sbi->s_mount_opt, USRQUOTA);
1391
617ba13b 1392 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1393 sbi->s_qf_names[GRPQUOTA])
1394 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1395
1396 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1397 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1398 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1399 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1400 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1401 "format mixing.\n");
1402 return 0;
1403 }
1404
1405 if (!sbi->s_jquota_fmt) {
2c8be6b2 1406 printk(KERN_ERR "EXT4-fs: journaled quota format "
ac27a0ec
DK		 1407 "not specified.\n");
1408 return 0;
1409 }
1410 } else {
1411 if (sbi->s_jquota_fmt) {
2c8be6b2
JK		 1412 printk(KERN_ERR "EXT4-fs: journaled quota format "
1413 "specified with no journaling "
ac27a0ec
DK		 1414 "enabled.\n");
1415 return 0;
1416 }
1417 }
1418#endif
1419 return 1;
1420}
1421
617ba13b 1422static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1423 int read_only)
1424{
617ba13b 1425 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1426 int res = 0;
1427
617ba13b 1428 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2b2d6d01
TT		 1429 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1430 "forcing read-only mode\n");
ac27a0ec
DK		 1431 res = MS_RDONLY;
1432 }
1433 if (read_only)
1434 return res;
617ba13b 1435 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2b2d6d01
TT		 1436 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1437 "running e2fsck is recommended\n");
617ba13b 1438 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
2b2d6d01
TT		 1439 printk(KERN_WARNING
1440 "EXT4-fs warning: mounting fs with errors, "
1441 "running e2fsck is recommended\n");
ac27a0ec
DK		 1442 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1443 le16_to_cpu(es->s_mnt_count) >=
1444 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2b2d6d01
TT		 1445 printk(KERN_WARNING
1446 "EXT4-fs warning: maximal mount count reached, "
1447 "running e2fsck is recommended\n");
ac27a0ec
DK		 1448 else if (le32_to_cpu(es->s_checkinterval) &&
1449 (le32_to_cpu(es->s_lastcheck) +
1450 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2b2d6d01
TT		 1451 printk(KERN_WARNING
1452 "EXT4-fs warning: checktime reached, "
1453 "running e2fsck is recommended\n");
ac27a0ec
DK		 1454#if 0
1455 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1456 * inconsistencies, to force a fsck at reboot. But for
1457 * a plain journaled filesystem we can keep it set as
1458 * valid forever! :)
1459 */
216c34b2 1460 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec
DK		 1461#endif
1462 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1463 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1464 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1465 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1466 ext4_update_dynamic_rev(sb);
1467 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1468
617ba13b 1469 ext4_commit_super(sb, es, 1);
ac27a0ec 1470 if (test_opt(sb, DEBUG))
617ba13b 1471 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1472 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1473 sb->s_blocksize,
1474 sbi->s_groups_count,
617ba13b
MC		 1475 EXT4_BLOCKS_PER_GROUP(sb),
1476 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1477 sbi->s_mount_opt);
1478
617ba13b 1479 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
ac27a0ec
DK		 1480 char b[BDEVNAME_SIZE];
1481
4776004f
TT		 1482 printk(KERN_INFO "EXT4 FS on %s, external journal on %s\n",
1483 sb->s_id, bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
ac27a0ec 1484 } else {
4776004f
TT		 1485 printk(KERN_INFO "EXT4 FS on %s, internal journal\n",
1486 sb->s_id);
ac27a0ec
DK		 1487 }
1488 return res;
1489}
1490
772cb7c8
JS		 1491static int ext4_fill_flex_info(struct super_block *sb)
1492{
1493 struct ext4_sb_info *sbi = EXT4_SB(sb);
1494 struct ext4_group_desc *gdp = NULL;
1495 struct buffer_head *bh;
1496 ext4_group_t flex_group_count;
1497 ext4_group_t flex_group;
1498 int groups_per_flex = 0;
1499 __u64 block_bitmap = 0;
1500 int i;
1501
1502 if (!sbi->s_es->s_log_groups_per_flex) {
1503 sbi->s_log_groups_per_flex = 0;
1504 return 1;
1505 }
1506
1507 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1508 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1509
1510 flex_group_count = (sbi->s_groups_count + groups_per_flex - 1) /
1511 groups_per_flex;
ec05e868 1512 sbi->s_flex_groups = kzalloc(flex_group_count *
772cb7c8
JS		 1513 sizeof(struct flex_groups), GFP_KERNEL);
1514 if (sbi->s_flex_groups == NULL) {
ec05e868
LZ		 1515 printk(KERN_ERR "EXT4-fs: not enough memory for "
1516 "%lu flex groups\n", flex_group_count);
772cb7c8
JS		 1517 goto failed;
1518 }
772cb7c8
JS		 1519
1520 gdp = ext4_get_group_desc(sb, 1, &bh);
1521 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1522
1523 for (i = 0; i < sbi->s_groups_count; i++) {
1524 gdp = ext4_get_group_desc(sb, i, &bh);
1525
1526 flex_group = ext4_flex_group(sbi, i);
1527 sbi->s_flex_groups[flex_group].free_inodes +=
1528 le16_to_cpu(gdp->bg_free_inodes_count);
1529 sbi->s_flex_groups[flex_group].free_blocks +=
1530 le16_to_cpu(gdp->bg_free_blocks_count);
1531 }
1532
1533 return 1;
1534failed:
1535 return 0;
1536}
1537
717d50e4
AD		 1538__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1539 struct ext4_group_desc *gdp)
1540{
1541 __u16 crc = 0;
1542
1543 if (sbi->s_es->s_feature_ro_compat &
1544 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1545 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1546 __le32 le_group = cpu_to_le32(block_group);
1547
1548 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1549 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1550 crc = crc16(crc, (__u8 *)gdp, offset);
1551 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1552 /* for checksum of struct ext4_group_desc do the rest...*/
1553 if ((sbi->s_es->s_feature_incompat &
1554 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1555 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1556 crc = crc16(crc, (__u8 *)gdp + offset,
1557 le16_to_cpu(sbi->s_es->s_desc_size) -
1558 offset);
1559 }
1560
1561 return cpu_to_le16(crc);
1562}
1563
1564int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1565 struct ext4_group_desc *gdp)
1566{
1567 if ((sbi->s_es->s_feature_ro_compat &
1568 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1569 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1570 return 0;
1571
1572 return 1;
1573}
1574
ac27a0ec 1575/* Called at mount-time, super-block is locked */
197cd65a 1576static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1577{
617ba13b
MC		 1578 struct ext4_sb_info *sbi = EXT4_SB(sb);
1579 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1580 ext4_fsblk_t last_block;
bd81d8ee
LV		 1581 ext4_fsblk_t block_bitmap;
1582 ext4_fsblk_t inode_bitmap;
1583 ext4_fsblk_t inode_table;
ce421581 1584 int flexbg_flag = 0;
fd2d4291 1585 ext4_group_t i;
ac27a0ec 1586
ce421581
JS		 1587 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1588 flexbg_flag = 1;
1589
af5bc92d 1590 ext4_debug("Checking group descriptors");
ac27a0ec 1591
197cd65a
AM		 1592 for (i = 0; i < sbi->s_groups_count; i++) {
1593 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1594
ce421581 1595 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1596 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1597 else
1598 last_block = first_block +
617ba13b 1599 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1600
8fadc143 1601 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1602 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0
JB		 1603 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1604 "Block bitmap for group %lu not in group "
1605 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1606 return 0;
1607 }
8fadc143 1608 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1609 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0
JB		 1610 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1611 "Inode bitmap for group %lu not in group "
1612 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1613 return 0;
1614 }
8fadc143 1615 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1616 if (inode_table < first_block ||
2b2d6d01 1617 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0
JB		 1618 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1619 "Inode table for group %lu not in group "
1620 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1621 return 0;
1622 }
b5f10eed 1623 spin_lock(sb_bgl_lock(sbi, i));
717d50e4 1624 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0
JB		 1625 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1626 "Checksum for group %lu failed (%u!=%u)\n",
1627 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1628 gdp)), le16_to_cpu(gdp->bg_checksum));
8a266467
TT		 1629 if (!(sb->s_flags & MS_RDONLY))
1630 return 0;
717d50e4 1631 }
b5f10eed 1632 spin_unlock(sb_bgl_lock(sbi, i));
ce421581
JS		 1633 if (!flexbg_flag)
1634 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1635 }
1636
bd81d8ee 1637 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1638 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1639 return 1;
1640}
1641
617ba13b 1642/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1643 * the superblock) which were deleted from all directories, but held open by
1644 * a process at the time of a crash. We walk the list and try to delete these
1645 * inodes at recovery time (only with a read-write filesystem).
1646 *
1647 * In order to keep the orphan inode chain consistent during traversal (in
1648 * case of crash during recovery), we link each inode into the superblock
1649 * orphan list_head and handle it the same way as an inode deletion during
1650 * normal operation (which journals the operations for us).
1651 *
1652 * We only do an iget() and an iput() on each inode, which is very safe if we
1653 * accidentally point at an in-use or already deleted inode. The worst that
1654 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1655 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1656 * e2fsck was run on this filesystem, and it must have already done the orphan
1657 * inode cleanup for us, so we can safely abort without any further action.
1658 */
2b2d6d01
TT		 1659static void ext4_orphan_cleanup(struct super_block *sb,
1660 struct ext4_super_block *es)
ac27a0ec
DK		 1661{
1662 unsigned int s_flags = sb->s_flags;
1663 int nr_orphans = 0, nr_truncates = 0;
1664#ifdef CONFIG_QUOTA
1665 int i;
1666#endif
1667 if (!es->s_last_orphan) {
1668 jbd_debug(4, "no orphan inodes to clean up\n");
1669 return;
1670 }
1671
a8f48a95
ES		 1672 if (bdev_read_only(sb->s_bdev)) {
1673 printk(KERN_ERR "EXT4-fs: write access "
1674 "unavailable, skipping orphan cleanup.\n");
1675 return;
1676 }
1677
617ba13b 1678 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1679 if (es->s_last_orphan)
1680 jbd_debug(1, "Errors on filesystem, "
1681 "clearing orphan list.\n");
1682 es->s_last_orphan = 0;
1683 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1684 return;
1685 }
1686
1687 if (s_flags & MS_RDONLY) {
617ba13b 1688 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1689 sb->s_id);
1690 sb->s_flags &= ~MS_RDONLY;
1691 }
1692#ifdef CONFIG_QUOTA
1693 /* Needed for iput() to work correctly and not trash data */
1694 sb->s_flags |= MS_ACTIVE;
1695 /* Turn on quotas so that they are updated correctly */
1696 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1697 if (EXT4_SB(sb)->s_qf_names[i]) {
1698 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1699 if (ret < 0)
1700 printk(KERN_ERR
2c8be6b2 1701 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1702 "quota: error %d\n", ret);
1703 }
1704 }
1705#endif
1706
1707 while (es->s_last_orphan) {
1708 struct inode *inode;
1709
97bd42b9
JB		 1710 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1711 if (IS_ERR(inode)) {
ac27a0ec
DK		 1712 es->s_last_orphan = 0;
1713 break;
1714 }
1715
617ba13b 1716 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1717 DQUOT_INIT(inode);
1718 if (inode->i_nlink) {
1719 printk(KERN_DEBUG
e5f8eab8 1720 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1721 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1722 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1723 inode->i_ino, inode->i_size);
617ba13b 1724 ext4_truncate(inode);
ac27a0ec
DK		 1725 nr_truncates++;
1726 } else {
1727 printk(KERN_DEBUG
1728 "%s: deleting unreferenced inode %lu\n",
46e665e9 1729 __func__, inode->i_ino);
ac27a0ec
DK		 1730 jbd_debug(2, "deleting unreferenced inode %lu\n",
1731 inode->i_ino);
1732 nr_orphans++;
1733 }
1734 iput(inode); /* The delete magic happens here! */
1735 }
1736
2b2d6d01 1737#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1738
1739 if (nr_orphans)
617ba13b 1740 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1741 sb->s_id, PLURAL(nr_orphans));
1742 if (nr_truncates)
617ba13b 1743 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1744 sb->s_id, PLURAL(nr_truncates));
1745#ifdef CONFIG_QUOTA
1746 /* Turn quotas off */
1747 for (i = 0; i < MAXQUOTAS; i++) {
1748 if (sb_dqopt(sb)->files[i])
6f28e087 1749 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1750 }
1751#endif
1752 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1753}
cd2291a4
ES		 1754/*
1755 * Maximal extent format file size.
1756 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1757 * extent format containers, within a sector_t, and within i_blocks
1758 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1759 * so that won't be a limiting factor.
1760 *
1761 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1762 */
1763static loff_t ext4_max_size(int blkbits)
1764{
1765 loff_t res;
1766 loff_t upper_limit = MAX_LFS_FILESIZE;
1767
1768 /* small i_blocks in vfs inode? */
1769 if (sizeof(blkcnt_t) < sizeof(u64)) {
1770 /*
1771 * CONFIG_LSF is not enabled implies the inode
1772 * i_block represent total blocks in 512 bytes
1773 * 32 == size of vfs inode i_blocks * 8
1774 */
1775 upper_limit = (1LL << 32) - 1;
1776
1777 /* total blocks in file system block size */
1778 upper_limit >>= (blkbits - 9);
1779 upper_limit <<= blkbits;
1780 }
1781
1782 /* 32-bit extent-start container, ee_block */
1783 res = 1LL << 32;
1784 res <<= blkbits;
1785 res -= 1;
1786
1787 /* Sanity check against vm- & vfs- imposed limits */
1788 if (res > upper_limit)
1789 res = upper_limit;
1790
1791 return res;
1792}
ac27a0ec 1793
ac27a0ec 1794/*
cd2291a4 1795 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1796 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1797 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1798 */
cd2291a4 1799static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1800{
617ba13b 1801 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1802 int meta_blocks;
1803 loff_t upper_limit;
1804 /* This is calculated to be the largest file size for a
cd2291a4 1805 * dense, bitmapped file such that the total number of
ac27a0ec 1806 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1807 * does not exceed 2^48 -1
1808 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1809 * total number of 512 bytes blocks of the file
1810 */
1811
1812 if (sizeof(blkcnt_t) < sizeof(u64)) {
1813 /*
1814 * CONFIG_LSF is not enabled implies the inode
1815 * i_block represent total blocks in 512 bytes
1816 * 32 == size of vfs inode i_blocks * 8
1817 */
1818 upper_limit = (1LL << 32) - 1;
1819
1820 /* total blocks in file system block size */
1821 upper_limit >>= (bits - 9);
1822
1823 } else {
8180a562
AK		 1824 /*
1825 * We use 48 bit ext4_inode i_blocks
1826 * With EXT4_HUGE_FILE_FL set the i_blocks
1827 * represent total number of blocks in
1828 * file system block size
1829 */
0fc1b451
AK		 1830 upper_limit = (1LL << 48) - 1;
1831
0fc1b451
AK		 1832 }
1833
1834 /* indirect blocks */
1835 meta_blocks = 1;
1836 /* double indirect blocks */
1837 meta_blocks += 1 + (1LL << (bits-2));
1838 /* tripple indirect blocks */
1839 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1840
1841 upper_limit -= meta_blocks;
1842 upper_limit <<= bits;
ac27a0ec
DK		 1843
1844 res += 1LL << (bits-2);
1845 res += 1LL << (2*(bits-2));
1846 res += 1LL << (3*(bits-2));
1847 res <<= bits;
1848 if (res > upper_limit)
1849 res = upper_limit;
0fc1b451
AK		 1850
1851 if (res > MAX_LFS_FILESIZE)
1852 res = MAX_LFS_FILESIZE;
1853
ac27a0ec
DK		 1854 return res;
1855}
1856
617ba13b 1857static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1858 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1859{
617ba13b 1860 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1861 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1862 int has_super = 0;
1863
1864 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1865
617ba13b 1866 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1867 nr < first_meta_bg)
70bbb3e0 1868 return logical_sb_block + nr + 1;
ac27a0ec 1869 bg = sbi->s_desc_per_block * nr;
617ba13b 1870 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1871 has_super = 1;
617ba13b 1872 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1873}
1874
c9de560d
AT		 1875/**
1876 * ext4_get_stripe_size: Get the stripe size.
1877 * @sbi: In memory super block info
1878 *
1879 * If we have specified it via mount option, then
1880 * use the mount option value. If the value specified at mount time is
1881 * greater than the blocks per group use the super block value.
1882 * If the super block value is greater than blocks per group return 0.
1883 * Allocator needs it be less than blocks per group.
1884 *
1885 */
1886static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1887{
1888 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1889 unsigned long stripe_width =
1890 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1891
1892 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1893 return sbi->s_stripe;
1894
1895 if (stripe_width <= sbi->s_blocks_per_group)
1896 return stripe_width;
1897
1898 if (stride <= sbi->s_blocks_per_group)
1899 return stride;
1900
1901 return 0;
1902}
ac27a0ec 1903
2b2d6d01 1904static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 1905 __releases(kernel_lock)
1906 __acquires(kernel_lock)
1d03ec98 1907
ac27a0ec 1908{
2b2d6d01 1909 struct buffer_head *bh;
617ba13b
MC		 1910 struct ext4_super_block *es = NULL;
1911 struct ext4_sb_info *sbi;
1912 ext4_fsblk_t block;
1913 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1914 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1915 unsigned long offset = 0;
1916 unsigned int journal_inum = 0;
1917 unsigned long journal_devnum = 0;
1918 unsigned long def_mount_opts;
1919 struct inode *root;
1d1fe1ee 1920 int ret = -EINVAL;
ac27a0ec 1921 int blocksize;
ac27a0ec
DK		 1922 int db_count;
1923 int i;
1924 int needs_recovery;
1925 __le32 features;
bd81d8ee 1926 __u64 blocks_count;
833f4077 1927 int err;
ac27a0ec
DK		 1928
1929 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1930 if (!sbi)
1931 return -ENOMEM;
1932 sb->s_fs_info = sbi;
1933 sbi->s_mount_opt = 0;
617ba13b
MC		 1934 sbi->s_resuid = EXT4_DEF_RESUID;
1935 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1936 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1937
1938 unlock_kernel();
1939
617ba13b 1940 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1941 if (!blocksize) {
617ba13b 1942 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1943 goto out_fail;
1944 }
1945
1946 /*
617ba13b 1947 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1948 * block sizes. We need to calculate the offset from buffer start.
1949 */
617ba13b 1950 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1951 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1952 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1953 } else {
70bbb3e0 1954 logical_sb_block = sb_block;
ac27a0ec
DK		 1955 }
1956
70bbb3e0 1957 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 1958 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1959 goto out_fail;
1960 }
1961 /*
1962 * Note: s_es must be initialized as soon as possible because
617ba13b 1963 * some ext4 macro-instructions depend on its value
ac27a0ec 1964 */
617ba13b 1965 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1966 sbi->s_es = es;
1967 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1968 if (sb->s_magic != EXT4_SUPER_MAGIC)
1969 goto cantfind_ext4;
ac27a0ec
DK		 1970
1971 /* Set defaults before we parse the mount options */
1972 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1973 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1974 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1975 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1976 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1977 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1978 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1979#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1980 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1981 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1982#endif
1983#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1984 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1985 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1986#endif
617ba13b
MC		 1987 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1988 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1989 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1990 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1991 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1992 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1993
1994 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1995 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1996 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 1997 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 1998 else
1999 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2000
2001 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2002 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2003
2004 set_opt(sbi->s_mount_opt, RESERVATION);
571640ca 2005 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2006
1e2462f9
MC		 2007 /*
2008 * turn on extents feature by default in ext4 filesystem
e4079a11
ES		 2009 * only if feature flag already set by mkfs or tune2fs.
2010 * Use -o noextents to turn it off
1e2462f9 2011 */
e4079a11
ES		 2012 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2013 set_opt(sbi->s_mount_opt, EXTENTS);
2014 else
2015 ext4_warning(sb, __func__,
2016 "extents feature not enabled on this filesystem, "
2017 "use tune2fs.\n");
3dbd0ede 2018 /*
e4079a11
ES		 2019 * turn on mballoc code by default in ext4 filesystem
2020 * Use -o nomballoc to turn it off
3dbd0ede
AK		 2021 */
2022 set_opt(sbi->s_mount_opt, MBALLOC);
1e2462f9 2023
dd919b98
AK		 2024 /*
2025 * enable delayed allocation by default
2026 * Use -o nodelalloc to turn it off
2027 */
2028 set_opt(sbi->s_mount_opt, DELALLOC);
2029
2030
2b2d6d01
TT		 2031 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
2032 NULL, 0))
ac27a0ec
DK		 2033 goto failed_mount;
2034
2035 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2036 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2037
617ba13b
MC		 2038 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2039 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2040 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2041 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 2042 printk(KERN_WARNING
617ba13b 2043 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 2044 "running e2fsck is recommended\n");
469108ff
TT		 2045
2046 /*
2047 * Since ext4 is still considered development code, we require
2048 * that the TEST_FILESYS flag in s->flags be set.
2049 */
2050 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
2051 printk(KERN_WARNING "EXT4-fs: %s: not marked "
2052 "OK to use with test code.\n", sb->s_id);
2053 goto failed_mount;
2054 }
2055
ac27a0ec
DK		 2056 /*
2057 * Check feature flags regardless of the revision level, since we
2058 * previously didn't change the revision level when setting the flags,
2059 * so there is a chance incompat flags are set on a rev 0 filesystem.
2060 */
617ba13b 2061 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2062 if (features) {
617ba13b 2063 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 2064 "unsupported optional features (%x).\n",
2065 sb->s_id, le32_to_cpu(features));
2066 goto failed_mount;
2067 }
617ba13b 2068 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2069 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2070 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 2071 "unsupported optional features (%x).\n",
2072 sb->s_id, le32_to_cpu(features));
2073 goto failed_mount;
2074 }
0fc1b451
AK		 2075 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2076 /*
2077 * Large file size enabled file system can only be
2078 * mount if kernel is build with CONFIG_LSF
2079 */
2080 if (sizeof(root->i_blocks) < sizeof(u64) &&
2081 !(sb->s_flags & MS_RDONLY)) {
2082 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2083 "files cannot be mounted read-write "
2084 "without CONFIG_LSF.\n", sb->s_id);
2085 goto failed_mount;
2086 }
2087 }
ac27a0ec
DK		 2088 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2089
617ba13b
MC		 2090 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2091 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2092 printk(KERN_ERR
617ba13b 2093 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2094 blocksize, sb->s_id);
2095 goto failed_mount;
2096 }
2097
ac27a0ec 2098 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2099
2100 /* Validate the filesystem blocksize */
2101 if (!sb_set_blocksize(sb, blocksize)) {
2102 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2103 blocksize);
ac27a0ec
DK		 2104 goto failed_mount;
2105 }
2106
2b2d6d01 2107 brelse(bh);
70bbb3e0
AM		 2108 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2109 offset = do_div(logical_sb_block, blocksize);
2110 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2111 if (!bh) {
2112 printk(KERN_ERR
617ba13b 2113 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2114 goto failed_mount;
2115 }
617ba13b 2116 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2117 sbi->s_es = es;
617ba13b 2118 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2119 printk(KERN_ERR
2120 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2121 goto failed_mount;
2122 }
2123 }
2124
e2b46574 2125 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 2126 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 2127
617ba13b
MC		 2128 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2129 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2130 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2131 } else {
2132 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2133 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2134 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2135 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2136 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2137 printk(KERN_ERR
2138 "EXT4-fs: unsupported inode size: %d\n",
2139 sbi->s_inode_size);
ac27a0ec
DK		 2140 goto failed_mount;
2141 }
ef7f3835
KS		 2142 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2143 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2144 }
0d1ee42f
AR		 2145 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2146 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2147 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2148 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2149 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2150 printk(KERN_ERR
8fadc143 2151 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2152 sbi->s_desc_size);
2153 goto failed_mount;
2154 }
2155 } else
2156 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2157 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2158 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2159 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2160 goto cantfind_ext4;
2161 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2162 if (sbi->s_inodes_per_block == 0)
617ba13b 2163 goto cantfind_ext4;
ac27a0ec
DK		 2164 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2165 sbi->s_inodes_per_block;
0d1ee42f 2166 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2167 sbi->s_sbh = bh;
2168 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2169 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2170 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2171 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2172 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2173 sbi->s_def_hash_version = es->s_def_hash_version;
2174
2175 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2176 printk(KERN_ERR
2177 "EXT4-fs: #blocks per group too big: %lu\n",
2178 sbi->s_blocks_per_group);
ac27a0ec
DK		 2179 goto failed_mount;
2180 }
ac27a0ec 2181 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2182 printk(KERN_ERR
2183 "EXT4-fs: #inodes per group too big: %lu\n",
2184 sbi->s_inodes_per_group);
ac27a0ec
DK		 2185 goto failed_mount;
2186 }
2187
bd81d8ee 2188 if (ext4_blocks_count(es) >
ac27a0ec 2189 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2190 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2191 " too large to mount safely\n", sb->s_id);
2192 if (sizeof(sector_t) < 8)
617ba13b 2193 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2194 "enabled\n");
2195 goto failed_mount;
2196 }
2197
617ba13b
MC		 2198 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2199 goto cantfind_ext4;
e7c95593
ES		 2200
2201 /* ensure blocks_count calculation below doesn't sign-extend */
2202 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2203 le32_to_cpu(es->s_first_data_block) + 1) {
2204 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2205 "first data block %u, blocks per group %lu\n",
2206 ext4_blocks_count(es),
2207 le32_to_cpu(es->s_first_data_block),
2208 EXT4_BLOCKS_PER_GROUP(sb));
2209 goto failed_mount;
2210 }
bd81d8ee
LV		 2211 blocks_count = (ext4_blocks_count(es) -
2212 le32_to_cpu(es->s_first_data_block) +
2213 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2214 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2215 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2216 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2217 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2218 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2219 GFP_KERNEL);
2220 if (sbi->s_group_desc == NULL) {
2b2d6d01 2221 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2222 goto failed_mount;
2223 }
2224
2225 bgl_lock_init(&sbi->s_blockgroup_lock);
2226
2227 for (i = 0; i < db_count; i++) {
70bbb3e0 2228 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2229 sbi->s_group_desc[i] = sb_bread(sb, block);
2230 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2231 printk(KERN_ERR "EXT4-fs: "
2232 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2233 db_count = i;
2234 goto failed_mount2;
2235 }
2236 }
2b2d6d01 2237 if (!ext4_check_descriptors(sb)) {
617ba13b 2238 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2239 goto failed_mount2;
2240 }
772cb7c8
JS		 2241 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2242 if (!ext4_fill_flex_info(sb)) {
2243 printk(KERN_ERR
2244 "EXT4-fs: unable to initialize "
2245 "flex_bg meta info!\n");
2246 goto failed_mount2;
2247 }
2248
ac27a0ec
DK		 2249 sbi->s_gdb_count = db_count;
2250 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2251 spin_lock_init(&sbi->s_next_gen_lock);
2252
833f4077
PZ		 2253 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2254 ext4_count_free_blocks(sb));
2255 if (!err) {
2256 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2257 ext4_count_free_inodes(sb));
2258 }
2259 if (!err) {
2260 err = percpu_counter_init(&sbi->s_dirs_counter,
2261 ext4_count_dirs(sb));
2262 }
6bc6e63f
AK		 2263 if (!err) {
2264 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2265 }
833f4077
PZ		 2266 if (err) {
2267 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2268 goto failed_mount3;
2269 }
ac27a0ec
DK		 2270
2271 /* per fileystem reservation list head & lock */
2272 spin_lock_init(&sbi->s_rsv_window_lock);
2273 sbi->s_rsv_window_root = RB_ROOT;
2274 /* Add a single, static dummy reservation to the start of the
2275 * reservation window list --- it gives us a placeholder for
2276 * append-at-start-of-list which makes the allocation logic
2277 * _much_ simpler. */
617ba13b
MC		 2278 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2279 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 2280 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2281 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2282 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec 2283
c9de560d
AT		 2284 sbi->s_stripe = ext4_get_stripe_size(sbi);
2285
ac27a0ec
DK		 2286 /*
2287 * set up enough so that it can read an inode
2288 */
617ba13b
MC		 2289 sb->s_op = &ext4_sops;
2290 sb->s_export_op = &ext4_export_ops;
2291 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2292#ifdef CONFIG_QUOTA
617ba13b
MC		 2293 sb->s_qcop = &ext4_qctl_operations;
2294 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2295#endif
2296 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2297
2298 sb->s_root = NULL;
2299
2300 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2301 EXT4_HAS_INCOMPAT_FEATURE(sb,
2302 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2303
2304 /*
2305 * The first inode we look at is the journal inode. Don't try
2306 * root first: it may be modified in the journal!
2307 */
2308 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2309 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2310 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2311 goto failed_mount3;
624080ed
TT		 2312 if (!(sb->s_flags & MS_RDONLY) &&
2313 EXT4_SB(sb)->s_journal->j_failed_commit) {
2314 printk(KERN_CRIT "EXT4-fs error (device %s): "
2315 "ext4_fill_super: Journal transaction "
2b2d6d01 2316 "%u is corrupt\n", sb->s_id,
624080ed 2317 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2318 if (test_opt(sb, ERRORS_RO)) {
2319 printk(KERN_CRIT
2320 "Mounting filesystem read-only\n");
624080ed
TT		 2321 sb->s_flags |= MS_RDONLY;
2322 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2323 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2324 }
2325 if (test_opt(sb, ERRORS_PANIC)) {
2326 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2327 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2328 ext4_commit_super(sb, es, 1);
2329 printk(KERN_CRIT
2330 "EXT4-fs (device %s): mount failed\n",
2331 sb->s_id);
2332 goto failed_mount4;
2333 }
2334 }
ac27a0ec 2335 } else if (journal_inum) {
617ba13b 2336 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2337 goto failed_mount3;
2338 } else {
2339 if (!silent)
2b2d6d01
TT		 2340 printk(KERN_ERR
2341 "ext4: No journal on filesystem on %s\n",
2342 sb->s_id);
ac27a0ec
DK		 2343 goto failed_mount3;
2344 }
2345
eb40a09c
JS		 2346 if (ext4_blocks_count(es) > 0xffffffffULL &&
2347 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2348 JBD2_FEATURE_INCOMPAT_64BIT)) {
2349 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2350 goto failed_mount4;
2351 }
2352
818d276c
GS		 2353 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2354 jbd2_journal_set_features(sbi->s_journal,
2355 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2356 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2357 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2358 jbd2_journal_set_features(sbi->s_journal,
2359 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2360 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2361 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2362 } else {
2363 jbd2_journal_clear_features(sbi->s_journal,
2364 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2365 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2366 }
2367
ac27a0ec
DK		 2368 /* We have now updated the journal if required, so we can
2369 * validate the data journaling mode. */
2370 switch (test_opt(sb, DATA_FLAGS)) {
2371 case 0:
2372 /* No mode set, assume a default based on the journal
63f57933
AM		 2373 * capabilities: ORDERED_DATA if the journal can
2374 * cope, else JOURNAL_DATA
2375 */
dab291af
MC		 2376 if (jbd2_journal_check_available_features
2377 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2378 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2379 else
2380 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2381 break;
2382
617ba13b
MC		 2383 case EXT4_MOUNT_ORDERED_DATA:
2384 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2385 if (!jbd2_journal_check_available_features
2386 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2387 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2388 "requested data journaling mode\n");
2389 goto failed_mount4;
2390 }
2391 default:
2392 break;
2393 }
2394
2395 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2396 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2397 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2398 "its supported only with writeback mode\n");
2399 clear_opt(sbi->s_mount_opt, NOBH);
2400 }
2401 }
2402 /*
dab291af 2403 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2404 * so we can safely mount the rest of the filesystem now.
2405 */
2406
1d1fe1ee
DH		 2407 root = ext4_iget(sb, EXT4_ROOT_INO);
2408 if (IS_ERR(root)) {
617ba13b 2409 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2410 ret = PTR_ERR(root);
ac27a0ec
DK		 2411 goto failed_mount4;
2412 }
2413 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2414 iput(root);
617ba13b 2415 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2416 goto failed_mount4;
2417 }
1d1fe1ee
DH		 2418 sb->s_root = d_alloc_root(root);
2419 if (!sb->s_root) {
2420 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2421 iput(root);
2422 ret = -ENOMEM;
2423 goto failed_mount4;
2424 }
ac27a0ec 2425
2b2d6d01 2426 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2427
2428 /* determine the minimum size of new large inodes, if present */
2429 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2430 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2431 EXT4_GOOD_OLD_INODE_SIZE;
2432 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2433 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2434 if (sbi->s_want_extra_isize <
2435 le16_to_cpu(es->s_want_extra_isize))
2436 sbi->s_want_extra_isize =
2437 le16_to_cpu(es->s_want_extra_isize);
2438 if (sbi->s_want_extra_isize <
2439 le16_to_cpu(es->s_min_extra_isize))
2440 sbi->s_want_extra_isize =
2441 le16_to_cpu(es->s_min_extra_isize);
2442 }
2443 }
2444 /* Check if enough inode space is available */
2445 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2446 sbi->s_inode_size) {
2447 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2448 EXT4_GOOD_OLD_INODE_SIZE;
2449 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2450 "available.\n");
2451 }
2452
ac27a0ec
DK		 2453 /*
2454 * akpm: core read_super() calls in here with the superblock locked.
2455 * That deadlocks, because orphan cleanup needs to lock the superblock
2456 * in numerous places. Here we just pop the lock - it's relatively
2457 * harmless, because we are now ready to accept write_super() requests,
2458 * and aviro says that's the only reason for hanging onto the
2459 * superblock lock.
2460 */
617ba13b
MC		 2461 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2462 ext4_orphan_cleanup(sb, es);
2463 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2464 if (needs_recovery)
2b2d6d01 2465 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
617ba13b 2466 ext4_mark_recovery_complete(sb, es);
2b2d6d01
TT		 2467 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2468 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2469 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2470 "writeback");
ac27a0ec 2471
dd919b98
AK		 2472 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2473 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2474 "requested data journaling mode\n");
2475 clear_opt(sbi->s_mount_opt, DELALLOC);
2476 } else if (test_opt(sb, DELALLOC))
2477 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2478
a86c6181 2479 ext4_ext_init(sb);
c9de560d 2480 ext4_mb_init(sb, needs_recovery);
a86c6181 2481
ac27a0ec
DK		 2482 lock_kernel();
2483 return 0;
2484
617ba13b 2485cantfind_ext4:
ac27a0ec 2486 if (!silent)
617ba13b 2487 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2488 sb->s_id);
2489 goto failed_mount;
2490
2491failed_mount4:
dab291af 2492 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 2493 sbi->s_journal = NULL;
ac27a0ec
DK		 2494failed_mount3:
2495 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2496 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2497 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2498 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2499failed_mount2:
2500 for (i = 0; i < db_count; i++)
2501 brelse(sbi->s_group_desc[i]);
2502 kfree(sbi->s_group_desc);
2503failed_mount:
2504#ifdef CONFIG_QUOTA
2505 for (i = 0; i < MAXQUOTAS; i++)
2506 kfree(sbi->s_qf_names[i]);
2507#endif
617ba13b 2508 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2509 brelse(bh);
2510out_fail:
2511 sb->s_fs_info = NULL;
2512 kfree(sbi);
2513 lock_kernel();
1d1fe1ee 2514 return ret;
ac27a0ec
DK		 2515}
2516
2517/*
2518 * Setup any per-fs journal parameters now. We'll do this both on
2519 * initial mount, once the journal has been initialised but before we've
2520 * done any recovery; and again on any subsequent remount.
2521 */
617ba13b 2522static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2523{
617ba13b 2524 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2525
2526 if (sbi->s_commit_interval)
2527 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2528 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2529 * interval here, but for now we'll just fall back to the jbd
2530 * default. */
2531
2532 spin_lock(&journal->j_state_lock);
2533 if (test_opt(sb, BARRIER))
dab291af 2534 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2535 else
dab291af 2536 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2537 spin_unlock(&journal->j_state_lock);
2538}
2539
617ba13b 2540static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2541 unsigned int journal_inum)
2542{
2543 struct inode *journal_inode;
2544 journal_t *journal;
2545
2546 /* First, test for the existence of a valid inode on disk. Bad
2547 * things happen if we iget() an unused inode, as the subsequent
2548 * iput() will try to delete it. */
2549
1d1fe1ee
DH		 2550 journal_inode = ext4_iget(sb, journal_inum);
2551 if (IS_ERR(journal_inode)) {
617ba13b 2552 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2553 return NULL;
2554 }
2555 if (!journal_inode->i_nlink) {
2556 make_bad_inode(journal_inode);
2557 iput(journal_inode);
617ba13b 2558 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2559 return NULL;
2560 }
2561
e5f8eab8 2562 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2563 journal_inode, journal_inode->i_size);
1d1fe1ee 2564 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2565 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2566 iput(journal_inode);
2567 return NULL;
2568 }
2569
dab291af 2570 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2571 if (!journal) {
617ba13b 2572 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2573 iput(journal_inode);
2574 return NULL;
2575 }
2576 journal->j_private = sb;
617ba13b 2577 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2578 return journal;
2579}
2580
617ba13b 2581static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2582 dev_t j_dev)
2583{
2b2d6d01 2584 struct buffer_head *bh;
ac27a0ec 2585 journal_t *journal;
617ba13b
MC		 2586 ext4_fsblk_t start;
2587 ext4_fsblk_t len;
ac27a0ec 2588 int hblock, blocksize;
617ba13b 2589 ext4_fsblk_t sb_block;
ac27a0ec 2590 unsigned long offset;
2b2d6d01 2591 struct ext4_super_block *es;
ac27a0ec
DK		 2592 struct block_device *bdev;
2593
617ba13b 2594 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2595 if (bdev == NULL)
2596 return NULL;
2597
2598 if (bd_claim(bdev, sb)) {
2599 printk(KERN_ERR
8c55e204 2600 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2601 blkdev_put(bdev);
2602 return NULL;
2603 }
2604
2605 blocksize = sb->s_blocksize;
2606 hblock = bdev_hardsect_size(bdev);
2607 if (blocksize < hblock) {
2608 printk(KERN_ERR
617ba13b 2609 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2610 goto out_bdev;
2611 }
2612
617ba13b
MC		 2613 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2614 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2615 set_blocksize(bdev, blocksize);
2616 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2617 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2618 "external journal\n");
2619 goto out_bdev;
2620 }
2621
617ba13b
MC		 2622 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2623 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2624 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2625 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2626 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2627 "bad superblock\n");
2628 brelse(bh);
2629 goto out_bdev;
2630 }
2631
617ba13b
MC		 2632 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2633 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2634 brelse(bh);
2635 goto out_bdev;
2636 }
2637
bd81d8ee 2638 len = ext4_blocks_count(es);
ac27a0ec
DK		 2639 start = sb_block + 1;
2640 brelse(bh); /* we're done with the superblock */
2641
dab291af 2642 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2643 start, len, blocksize);
2644 if (!journal) {
617ba13b 2645 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2646 goto out_bdev;
2647 }
2648 journal->j_private = sb;
2649 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2650 wait_on_buffer(journal->j_sb_buffer);
2651 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2652 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2653 goto out_journal;
2654 }
2655 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2656 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2657 "user (unsupported) - %d\n",
2658 be32_to_cpu(journal->j_superblock->s_nr_users));
2659 goto out_journal;
2660 }
617ba13b
MC		 2661 EXT4_SB(sb)->journal_bdev = bdev;
2662 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2663 return journal;
2664out_journal:
dab291af 2665 jbd2_journal_destroy(journal);
ac27a0ec 2666out_bdev:
617ba13b 2667 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2668 return NULL;
2669}
2670
617ba13b
MC		 2671static int ext4_load_journal(struct super_block *sb,
2672 struct ext4_super_block *es,
ac27a0ec
DK		 2673 unsigned long journal_devnum)
2674{
2675 journal_t *journal;
2676 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2677 dev_t journal_dev;
2678 int err = 0;
2679 int really_read_only;
2680
2681 if (journal_devnum &&
2682 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2683 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2684 "numbers have changed\n");
2685 journal_dev = new_decode_dev(journal_devnum);
2686 } else
2687 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2688
2689 really_read_only = bdev_read_only(sb->s_bdev);
2690
2691 /*
2692 * Are we loading a blank journal or performing recovery after a
2693 * crash? For recovery, we need to check in advance whether we
2694 * can get read-write access to the device.
2695 */
2696
617ba13b 2697 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2698 if (sb->s_flags & MS_RDONLY) {
617ba13b 2699 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2700 "required on readonly filesystem.\n");
2701 if (really_read_only) {
617ba13b 2702 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2703 "unavailable, cannot proceed.\n");
2704 return -EROFS;
2705 }
2b2d6d01
TT		 2706 printk(KERN_INFO "EXT4-fs: write access will "
2707 "be enabled during recovery.\n");
ac27a0ec
DK		 2708 }
2709 }
2710
2711 if (journal_inum && journal_dev) {
617ba13b 2712 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2713 "and inode journals!\n");
2714 return -EINVAL;
2715 }
2716
2717 if (journal_inum) {
617ba13b 2718 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2719 return -EINVAL;
2720 } else {
617ba13b 2721 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2722 return -EINVAL;
2723 }
2724
4776004f
TT		 2725 if (journal->j_flags & JBD2_BARRIER)
2726 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2727 else
2728 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2729
ac27a0ec 2730 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2731 err = jbd2_journal_update_format(journal);
ac27a0ec 2732 if (err) {
617ba13b 2733 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2734 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2735 return err;
2736 }
2737 }
2738
617ba13b 2739 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2740 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2741 if (!err)
dab291af 2742 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2743
2744 if (err) {
617ba13b 2745 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2746 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2747 return err;
2748 }
2749
617ba13b
MC		 2750 EXT4_SB(sb)->s_journal = journal;
2751 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2752
2753 if (journal_devnum &&
2754 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2755 es->s_journal_dev = cpu_to_le32(journal_devnum);
2756 sb->s_dirt = 1;
2757
2758 /* Make sure we flush the recovery flag to disk. */
617ba13b 2759 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2760 }
2761
2762 return 0;
2763}
2764
2b2d6d01
TT		 2765static int ext4_create_journal(struct super_block *sb,
2766 struct ext4_super_block *es,
ac27a0ec
DK		 2767 unsigned int journal_inum)
2768{
2769 journal_t *journal;
6c675bd4 2770 int err;
ac27a0ec
DK		 2771
2772 if (sb->s_flags & MS_RDONLY) {
617ba13b 2773 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2774 "create journal.\n");
2775 return -EROFS;
2776 }
2777
6c675bd4
BP		 2778 journal = ext4_get_journal(sb, journal_inum);
2779 if (!journal)
ac27a0ec
DK		 2780 return -EINVAL;
2781
617ba13b 2782 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2783 journal_inum);
2784
6c675bd4
BP		 2785 err = jbd2_journal_create(journal);
2786 if (err) {
617ba13b 2787 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2788 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2789 return -EIO;
2790 }
2791
617ba13b 2792 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2793
617ba13b
MC		 2794 ext4_update_dynamic_rev(sb);
2795 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2796 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2797
2798 es->s_journal_inum = cpu_to_le32(journal_inum);
2799 sb->s_dirt = 1;
2800
2801 /* Make sure we flush the recovery flag to disk. */
617ba13b 2802 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2803
2804 return 0;
2805}
2806
2b2d6d01
TT		 2807static void ext4_commit_super(struct super_block *sb,
2808 struct ext4_super_block *es, int sync)
ac27a0ec 2809{
617ba13b 2810 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2811
2812 if (!sbh)
2813 return;
2814 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2815 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2816 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2817 BUFFER_TRACE(sbh, "marking dirty");
2818 mark_buffer_dirty(sbh);
2819 if (sync)
2820 sync_dirty_buffer(sbh);
2821}
2822
2823
2824/*
2825 * Have we just finished recovery? If so, and if we are mounting (or
2826 * remounting) the filesystem readonly, then we will end up with a
2827 * consistent fs on disk. Record that fact.
2828 */
2b2d6d01
TT		 2829static void ext4_mark_recovery_complete(struct super_block *sb,
2830 struct ext4_super_block *es)
ac27a0ec 2831{
617ba13b 2832 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2833
dab291af
MC		 2834 jbd2_journal_lock_updates(journal);
2835 jbd2_journal_flush(journal);
32c37730 2836 lock_super(sb);
617ba13b 2837 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2838 sb->s_flags & MS_RDONLY) {
617ba13b 2839 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2840 sb->s_dirt = 0;
617ba13b 2841 ext4_commit_super(sb, es, 1);
ac27a0ec 2842 }
32c37730 2843 unlock_super(sb);
dab291af 2844 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2845}
2846
2847/*
2848 * If we are mounting (or read-write remounting) a filesystem whose journal
2849 * has recorded an error from a previous lifetime, move that error to the
2850 * main filesystem now.
2851 */
2b2d6d01
TT		 2852static void ext4_clear_journal_err(struct super_block *sb,
2853 struct ext4_super_block *es)
ac27a0ec
DK		 2854{
2855 journal_t *journal;
2856 int j_errno;
2857 const char *errstr;
2858
617ba13b 2859 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2860
2861 /*
2862 * Now check for any error status which may have been recorded in the
617ba13b 2863 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2864 */
2865
dab291af 2866 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2867 if (j_errno) {
2868 char nbuf[16];
2869
617ba13b 2870 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 2871 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 2872 "from previous mount: %s", errstr);
46e665e9 2873 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 2874 "filesystem check.");
2875
617ba13b
MC		 2876 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2877 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2b2d6d01 2878 ext4_commit_super(sb, es, 1);
ac27a0ec 2879
dab291af 2880 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2881 }
2882}
2883
2884/*
2885 * Force the running and committing transactions to commit,
2886 * and wait on the commit.
2887 */
617ba13b 2888int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2889{
2890 journal_t *journal;
2891 int ret;
2892
2893 if (sb->s_flags & MS_RDONLY)
2894 return 0;
2895
617ba13b 2896 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2897 sb->s_dirt = 0;
617ba13b 2898 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2899 return ret;
2900}
2901
2902/*
617ba13b 2903 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2904 * have to propagate any other updates to the superblock on disk at this
2905 * point. Just start an async writeback to get the buffers on their way
2906 * to the disk.
2907 *
2908 * This implicitly triggers the writebehind on sync().
2909 */
2910
2b2d6d01 2911static void ext4_write_super(struct super_block *sb)
ac27a0ec
DK		 2912{
2913 if (mutex_trylock(&sb->s_lock) != 0)
2914 BUG();
2915 sb->s_dirt = 0;
2916}
2917
617ba13b 2918static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2919{
2920 tid_t target;
2921
2922 sb->s_dirt = 0;
dab291af 2923 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2924 if (wait)
dab291af 2925 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2926 }
2927 return 0;
2928}
2929
2930/*
2931 * LVM calls this function before a (read-only) snapshot is created. This
2932 * gives us a chance to flush the journal completely and mark the fs clean.
2933 */
617ba13b 2934static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2935{
2936 sb->s_dirt = 0;
2937
2938 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2939 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2940
2941 /* Now we set up the journal barrier. */
dab291af
MC		 2942 jbd2_journal_lock_updates(journal);
2943 jbd2_journal_flush(journal);
ac27a0ec
DK		 2944
2945 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2946 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2947 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2948 }
2949}
2950
2951/*
2952 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2953 * flag here, even though the filesystem is not technically dirty yet.
2954 */
617ba13b 2955static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2956{
2957 if (!(sb->s_flags & MS_RDONLY)) {
2958 lock_super(sb);
2959 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2960 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2961 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2962 unlock_super(sb);
dab291af 2963 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2964 }
2965}
2966
2b2d6d01 2967static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 2968{
2b2d6d01 2969 struct ext4_super_block *es;
617ba13b
MC		 2970 struct ext4_sb_info *sbi = EXT4_SB(sb);
2971 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2972 unsigned long old_sb_flags;
617ba13b 2973 struct ext4_mount_options old_opts;
8a266467 2974 ext4_group_t g;
ac27a0ec
DK		 2975 int err;
2976#ifdef CONFIG_QUOTA
2977 int i;
2978#endif
2979
2980 /* Store the original options */
2981 old_sb_flags = sb->s_flags;
2982 old_opts.s_mount_opt = sbi->s_mount_opt;
2983 old_opts.s_resuid = sbi->s_resuid;
2984 old_opts.s_resgid = sbi->s_resgid;
2985 old_opts.s_commit_interval = sbi->s_commit_interval;
2986#ifdef CONFIG_QUOTA
2987 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2988 for (i = 0; i < MAXQUOTAS; i++)
2989 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2990#endif
2991
2992 /*
2993 * Allow the "check" option to be passed as a remount option.
2994 */
2995 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2996 err = -EINVAL;
2997 goto restore_opts;
2998 }
2999
617ba13b 3000 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 3001 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3002
3003 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3004 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3005
3006 es = sbi->s_es;
3007
617ba13b 3008 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 3009
3010 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3011 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3012 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3013 err = -EROFS;
3014 goto restore_opts;
3015 }
3016
3017 if (*flags & MS_RDONLY) {
3018 /*
3019 * First of all, the unconditional stuff we have to do
3020 * to disable replay of the journal when we next remount
3021 */
3022 sb->s_flags |= MS_RDONLY;
3023
3024 /*
3025 * OK, test if we are remounting a valid rw partition
3026 * readonly, and if so set the rdonly flag and then
3027 * mark the partition as valid again.
3028 */
617ba13b
MC		 3029 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3030 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3031 es->s_state = cpu_to_le16(sbi->s_mount_state);
3032
32c37730
JK		 3033 /*
3034 * We have to unlock super so that we can wait for
3035 * transactions.
3036 */
3037 unlock_super(sb);
617ba13b 3038 ext4_mark_recovery_complete(sb, es);
32c37730 3039 lock_super(sb);
ac27a0ec
DK		 3040 } else {
3041 __le32 ret;
617ba13b
MC		 3042 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3043 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3044 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 3045 "remount RDWR because of unsupported "
3046 "optional features (%x).\n",
3047 sb->s_id, le32_to_cpu(ret));
3048 err = -EROFS;
3049 goto restore_opts;
3050 }
ead6596b 3051
8a266467
TT		 3052 /*
3053 * Make sure the group descriptor checksums
3054 * are sane. If they aren't, refuse to
3055 * remount r/w.
3056 */
3057 for (g = 0; g < sbi->s_groups_count; g++) {
3058 struct ext4_group_desc *gdp =
3059 ext4_get_group_desc(sb, g, NULL);
3060
3061 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3062 printk(KERN_ERR
3063 "EXT4-fs: ext4_remount: "
3064 "Checksum for group %lu failed (%u!=%u)\n",
3065 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3066 le16_to_cpu(gdp->bg_checksum));
3067 err = -EINVAL;
3068 goto restore_opts;
3069 }
3070 }
3071
ead6596b
ES		 3072 /*
3073 * If we have an unprocessed orphan list hanging
3074 * around from a previously readonly bdev mount,
3075 * require a full umount/remount for now.
3076 */
3077 if (es->s_last_orphan) {
3078 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3079 "remount RDWR because of unprocessed "
3080 "orphan inode list. Please "
3081 "umount/remount instead.\n",
3082 sb->s_id);
3083 err = -EINVAL;
3084 goto restore_opts;
3085 }
3086
ac27a0ec
DK		 3087 /*
3088 * Mounting a RDONLY partition read-write, so reread
3089 * and store the current valid flag. (It may have
3090 * been changed by e2fsck since we originally mounted
3091 * the partition.)
3092 */
617ba13b 3093 ext4_clear_journal_err(sb, es);
ac27a0ec 3094 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3095 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3096 goto restore_opts;
2b2d6d01 3097 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3098 sb->s_flags &= ~MS_RDONLY;
3099 }
3100 }
3101#ifdef CONFIG_QUOTA
3102 /* Release old quota file names */
3103 for (i = 0; i < MAXQUOTAS; i++)
3104 if (old_opts.s_qf_names[i] &&
3105 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3106 kfree(old_opts.s_qf_names[i]);
3107#endif
3108 return 0;
3109restore_opts:
3110 sb->s_flags = old_sb_flags;
3111 sbi->s_mount_opt = old_opts.s_mount_opt;
3112 sbi->s_resuid = old_opts.s_resuid;
3113 sbi->s_resgid = old_opts.s_resgid;
3114 sbi->s_commit_interval = old_opts.s_commit_interval;
3115#ifdef CONFIG_QUOTA
3116 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3117 for (i = 0; i < MAXQUOTAS; i++) {
3118 if (sbi->s_qf_names[i] &&
3119 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3120 kfree(sbi->s_qf_names[i]);
3121 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3122 }
3123#endif
3124 return err;
3125}
3126
2b2d6d01 3127static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3128{
3129 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3130 struct ext4_sb_info *sbi = EXT4_SB(sb);
3131 struct ext4_super_block *es = sbi->s_es;
960cc398 3132 u64 fsid;
ac27a0ec 3133
5e70030d
BP		 3134 if (test_opt(sb, MINIX_DF)) {
3135 sbi->s_overhead_last = 0;
6bc9feff 3136 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 3137 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 3138 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3139 smp_rmb();
3140
3141 /*
5e70030d
BP		 3142 * Compute the overhead (FS structures). This is constant
3143 * for a given filesystem unless the number of block groups
3144 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3145 */
3146
3147 /*
3148 * All of the blocks before first_data_block are
3149 * overhead
3150 */
3151 overhead = le32_to_cpu(es->s_first_data_block);
3152
3153 /*
3154 * Add the overhead attributed to the superblock and
3155 * block group descriptors. If the sparse superblocks
3156 * feature is turned on, then not all groups have this.
3157 */
3158 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3159 overhead += ext4_bg_has_super(sb, i) +
3160 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3161 cond_resched();
3162 }
3163
3164 /*
3165 * Every block group has an inode bitmap, a block
3166 * bitmap, and an inode table.
3167 */
5e70030d
BP		 3168 overhead += ngroups * (2 + sbi->s_itb_per_group);
3169 sbi->s_overhead_last = overhead;
3170 smp_wmb();
6bc9feff 3171 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3172 }
3173
617ba13b 3174 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3175 buf->f_bsize = sb->s_blocksize;
5e70030d 3176 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3177 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3178 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3179 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3180 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3181 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3182 buf->f_bavail = 0;
3183 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3184 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3185 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3186 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3187 fsid = le64_to_cpup((void *)es->s_uuid) ^
3188 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3189 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3190 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3191 return 0;
3192}
3193
3194/* Helper function for writing quotas on sync - we need to start transaction before quota file
3195 * is locked for write. Otherwise the are possible deadlocks:
3196 * Process 1 Process 2
617ba13b 3197 * ext4_create() quota_sync()
dab291af 3198 * jbd2_journal_start() write_dquot()
ac27a0ec 3199 * DQUOT_INIT() down(dqio_mutex)
dab291af 3200 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3201 *
3202 */
3203
3204#ifdef CONFIG_QUOTA
3205
3206static inline struct inode *dquot_to_inode(struct dquot *dquot)
3207{
3208 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3209}
3210
617ba13b 3211static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3212{
3213 handle_t *handle;
3214 int ret, err;
3215
3216 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3217 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3218 if (IS_ERR(handle))
3219 return PTR_ERR(handle);
3220 ret = dquot_initialize(inode, type);
617ba13b 3221 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3222 if (!ret)
3223 ret = err;
3224 return ret;
3225}
3226
617ba13b 3227static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3228{
3229 handle_t *handle;
3230 int ret, err;
3231
3232 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3233 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2887df13
JK		 3234 if (IS_ERR(handle)) {
3235 /*
3236 * We call dquot_drop() anyway to at least release references
3237 * to quota structures so that umount does not hang.
3238 */
3239 dquot_drop(inode);
ac27a0ec 3240 return PTR_ERR(handle);
2887df13 3241 }
ac27a0ec 3242 ret = dquot_drop(inode);
617ba13b 3243 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3244 if (!ret)
3245 ret = err;
3246 return ret;
3247}
3248
617ba13b 3249static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3250{
3251 int ret, err;
3252 handle_t *handle;
3253 struct inode *inode;
3254
3255 inode = dquot_to_inode(dquot);
617ba13b
MC		 3256 handle = ext4_journal_start(inode,
3257 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3258 if (IS_ERR(handle))
3259 return PTR_ERR(handle);
3260 ret = dquot_commit(dquot);
617ba13b 3261 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3262 if (!ret)
3263 ret = err;
3264 return ret;
3265}
3266
617ba13b 3267static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3268{
3269 int ret, err;
3270 handle_t *handle;
3271
617ba13b
MC		 3272 handle = ext4_journal_start(dquot_to_inode(dquot),
3273 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3274 if (IS_ERR(handle))
3275 return PTR_ERR(handle);
3276 ret = dquot_acquire(dquot);
617ba13b 3277 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3278 if (!ret)
3279 ret = err;
3280 return ret;
3281}
3282
617ba13b 3283static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3284{
3285 int ret, err;
3286 handle_t *handle;
3287
617ba13b
MC		 3288 handle = ext4_journal_start(dquot_to_inode(dquot),
3289 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3290 if (IS_ERR(handle)) {
3291 /* Release dquot anyway to avoid endless cycle in dqput() */
3292 dquot_release(dquot);
ac27a0ec 3293 return PTR_ERR(handle);
9c3013e9 3294 }
ac27a0ec 3295 ret = dquot_release(dquot);
617ba13b 3296 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3297 if (!ret)
3298 ret = err;
3299 return ret;
3300}
3301
617ba13b 3302static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3303{
2c8be6b2 3304 /* Are we journaling quotas? */
617ba13b
MC		 3305 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3306 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3307 dquot_mark_dquot_dirty(dquot);
617ba13b 3308 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3309 } else {
3310 return dquot_mark_dquot_dirty(dquot);
3311 }
3312}
3313
617ba13b 3314static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3315{
3316 int ret, err;
3317 handle_t *handle;
3318
3319 /* Data block + inode block */
617ba13b 3320 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3321 if (IS_ERR(handle))
3322 return PTR_ERR(handle);
3323 ret = dquot_commit_info(sb, type);
617ba13b 3324 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3325 if (!ret)
3326 ret = err;
3327 return ret;
3328}
3329
3330/*
3331 * Turn on quotas during mount time - we need to find
3332 * the quota file and such...
3333 */
617ba13b 3334static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3335{
617ba13b
MC		 3336 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3337 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3338}
3339
3340/*
3341 * Standard function to be called on quota_on
3342 */
617ba13b 3343static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6f28e087 3344 char *path, int remount)
ac27a0ec
DK		 3345{
3346 int err;
3347 struct nameidata nd;
3348
3349 if (!test_opt(sb, QUOTA))
3350 return -EINVAL;
0623543b
JK		 3351 /* When remounting, no checks are needed and in fact, path is NULL */
3352 if (remount)
6f28e087 3353 return vfs_quota_on(sb, type, format_id, path, remount);
0623543b 3354
ac27a0ec
DK		 3355 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3356 if (err)
3357 return err;
0623543b 3358
ac27a0ec 3359 /* Quotafile not on the same filesystem? */
4ac91378 3360 if (nd.path.mnt->mnt_sb != sb) {
1d957f9b 3361 path_put(&nd.path);
ac27a0ec
DK		 3362 return -EXDEV;
3363 }
0623543b
JK		 3364 /* Journaling quota? */
3365 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3366 /* Quotafile not in fs root? */
0623543b
JK		 3367 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3368 printk(KERN_WARNING
3369 "EXT4-fs: Quota file not on filesystem root. "
3370 "Journaled quota will not work.\n");
2b2d6d01 3371 }
0623543b
JK		 3372
3373 /*
3374 * When we journal data on quota file, we have to flush journal to see
3375 * all updates to the file when we bypass pagecache...
3376 */
3377 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3378 /*
3379 * We don't need to lock updates but journal_flush() could
3380 * otherwise be livelocked...
3381 */
3382 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3383 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3384 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3385 }
3386
77e69dac 3387 err = vfs_quota_on_path(sb, type, format_id, &nd.path);
1d957f9b 3388 path_put(&nd.path);
77e69dac 3389 return err;
ac27a0ec
DK		 3390}
3391
3392/* Read data from quotafile - avoid pagecache and such because we cannot afford
3393 * acquiring the locks... As quota files are never truncated and quota code
3394 * itself serializes the operations (and noone else should touch the files)
3395 * we don't have to be afraid of races */
617ba13b 3396static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3397 size_t len, loff_t off)
3398{
3399 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3400 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3401 int err = 0;
3402 int offset = off & (sb->s_blocksize - 1);
3403 int tocopy;
3404 size_t toread;
3405 struct buffer_head *bh;
3406 loff_t i_size = i_size_read(inode);
3407
3408 if (off > i_size)
3409 return 0;
3410 if (off+len > i_size)
3411 len = i_size-off;
3412 toread = len;
3413 while (toread > 0) {
3414 tocopy = sb->s_blocksize - offset < toread ?
3415 sb->s_blocksize - offset : toread;
617ba13b 3416 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3417 if (err)
3418 return err;
3419 if (!bh) /* A hole? */
3420 memset(data, 0, tocopy);
3421 else
3422 memcpy(data, bh->b_data+offset, tocopy);
3423 brelse(bh);
3424 offset = 0;
3425 toread -= tocopy;
3426 data += tocopy;
3427 blk++;
3428 }
3429 return len;
3430}
3431
3432/* Write to quotafile (we know the transaction is already started and has
3433 * enough credits) */
617ba13b 3434static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3435 const char *data, size_t len, loff_t off)
3436{
3437 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3438 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3439 int err = 0;
3440 int offset = off & (sb->s_blocksize - 1);
3441 int tocopy;
617ba13b 3442 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3443 size_t towrite = len;
3444 struct buffer_head *bh;
3445 handle_t *handle = journal_current_handle();
3446
9c3013e9 3447 if (!handle) {
e5f8eab8 3448 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3449 " cancelled because transaction is not started.\n",
3450 (unsigned long long)off, (unsigned long long)len);
3451 return -EIO;
3452 }
ac27a0ec
DK		 3453 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3454 while (towrite > 0) {
3455 tocopy = sb->s_blocksize - offset < towrite ?
3456 sb->s_blocksize - offset : towrite;
617ba13b 3457 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3458 if (!bh)
3459 goto out;
3460 if (journal_quota) {
617ba13b 3461 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3462 if (err) {
3463 brelse(bh);
3464 goto out;
3465 }
3466 }
3467 lock_buffer(bh);
3468 memcpy(bh->b_data+offset, data, tocopy);
3469 flush_dcache_page(bh->b_page);
3470 unlock_buffer(bh);
3471 if (journal_quota)
617ba13b 3472 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3473 else {
3474 /* Always do at least ordered writes for quotas */
678aaf48 3475 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3476 mark_buffer_dirty(bh);
3477 }
3478 brelse(bh);
3479 if (err)
3480 goto out;
3481 offset = 0;
3482 towrite -= tocopy;
3483 data += tocopy;
3484 blk++;
3485 }
3486out:
4d04e4fb
JK		 3487 if (len == towrite) {
3488 mutex_unlock(&inode->i_mutex);
ac27a0ec 3489 return err;
4d04e4fb 3490 }
ac27a0ec
DK		 3491 if (inode->i_size < off+len-towrite) {
3492 i_size_write(inode, off+len-towrite);
617ba13b 3493 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3494 }
ac27a0ec 3495 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3496 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3497 mutex_unlock(&inode->i_mutex);
3498 return len - towrite;
3499}
3500
3501#endif
3502
617ba13b 3503static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3504 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3505{
617ba13b 3506 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3507}
3508
617ba13b 3509static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3510 .owner = THIS_MODULE,
617ba13b
MC		 3511 .name = "ext4dev",
3512 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3513 .kill_sb = kill_block_super,
3514 .fs_flags = FS_REQUIRES_DEV,
3515};
3516
617ba13b 3517static int __init init_ext4_fs(void)
ac27a0ec 3518{
c9de560d
AT		 3519 int err;
3520
3521 err = init_ext4_mballoc();
ac27a0ec
DK		 3522 if (err)
3523 return err;
c9de560d
AT		 3524
3525 err = init_ext4_xattr();
3526 if (err)
3527 goto out2;
ac27a0ec
DK		 3528 err = init_inodecache();
3529 if (err)
3530 goto out1;
63f57933 3531 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3532 if (err)
3533 goto out;
3534 return 0;
3535out:
3536 destroy_inodecache();
3537out1:
617ba13b 3538 exit_ext4_xattr();
c9de560d
AT		 3539out2:
3540 exit_ext4_mballoc();
ac27a0ec
DK		 3541 return err;
3542}
3543
617ba13b 3544static void __exit exit_ext4_fs(void)
ac27a0ec 3545{
617ba13b 3546 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3547 destroy_inodecache();
617ba13b 3548 exit_ext4_xattr();
c9de560d 3549 exit_ext4_mballoc();
ac27a0ec
DK		 3550}
3551
3552MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3553MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3554MODULE_LICENSE("GPL");
617ba13b
MC		 3555module_init(init_ext4_fs)
3556module_exit(exit_ext4_fs)
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