projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ext3: add support for extent_map library
[linux-2.6-block.git] / fs / ext3 / super.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/ext3/super.c
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
1da177e4
LT		 19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
a5694255 32#include <linux/exportfs.h>
1da177e4
LT		 33#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
8fc2751b 38#include <linux/seq_file.h>
3fc74269 39#include <linux/log2.h>
381be254 40
1da177e4 41#include <asm/uaccess.h>
381be254 42
1da177e4
LT		 43#include "xattr.h"
44#include "acl.h"
381be254 45#include "namei.h"
1da177e4 46
71b96257
JL		 47static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
48 unsigned long journal_devnum);
1da177e4 49static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
eee194e7 50 unsigned int);
c4be0c1d
TS		 51static int ext3_commit_super(struct super_block *sb,
52 struct ext3_super_block *es,
1da177e4
LT		 53 int sync);
54static void ext3_mark_recovery_complete(struct super_block * sb,
55 struct ext3_super_block * es);
56static void ext3_clear_journal_err(struct super_block * sb,
57 struct ext3_super_block * es);
58static int ext3_sync_fs(struct super_block *sb, int wait);
59static const char *ext3_decode_error(struct super_block * sb, int errno,
60 char nbuf[16]);
61static int ext3_remount (struct super_block * sb, int * flags, char * data);
726c3342 62static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
c4be0c1d 63static int ext3_unfreeze(struct super_block *sb);
1da177e4 64static void ext3_write_super (struct super_block * sb);
c4be0c1d 65static int ext3_freeze(struct super_block *sb);
1da177e4 66
ae6ddcc5 67/*
1da177e4
LT		 68 * Wrappers for journal_start/end.
69 *
70 * The only special thing we need to do here is to make sure that all
71 * journal_end calls result in the superblock being marked dirty, so
72 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 73 * appropriate.
1da177e4
LT		 74 */
75handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
76{
77 journal_t *journal;
78
79 if (sb->s_flags & MS_RDONLY)
80 return ERR_PTR(-EROFS);
81
82 /* Special case here: if the journal has aborted behind our
83 * backs (eg. EIO in the commit thread), then we still need to
84 * take the FS itself readonly cleanly. */
85 journal = EXT3_SB(sb)->s_journal;
86 if (is_journal_aborted(journal)) {
e05b6b52 87 ext3_abort(sb, __func__,
1da177e4
LT		 88 "Detected aborted journal");
89 return ERR_PTR(-EROFS);
90 }
91
92 return journal_start(journal, nblocks);
93}
94
ae6ddcc5 95/*
1da177e4
LT		 96 * The only special thing we need to do here is to make sure that all
97 * journal_stop calls result in the superblock being marked dirty, so
98 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 99 * appropriate.
1da177e4
LT		 100 */
101int __ext3_journal_stop(const char *where, handle_t *handle)
102{
103 struct super_block *sb;
104 int err;
105 int rc;
106
107 sb = handle->h_transaction->t_journal->j_private;
108 err = handle->h_err;
109 rc = journal_stop(handle);
110
111 if (!err)
112 err = rc;
113 if (err)
114 __ext3_std_error(sb, where, err);
115 return err;
116}
117
118void ext3_journal_abort_handle(const char *caller, const char *err_fn,
119 struct buffer_head *bh, handle_t *handle, int err)
120{
121 char nbuf[16];
122 const char *errstr = ext3_decode_error(NULL, err, nbuf);
123
124 if (bh)
125 BUFFER_TRACE(bh, "abort");
126
127 if (!handle->h_err)
128 handle->h_err = err;
129
130 if (is_handle_aborted(handle))
131 return;
132
133 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
134 caller, errstr, err_fn);
135
136 journal_abort_handle(handle);
137}
138
139/* Deal with the reporting of failure conditions on a filesystem such as
140 * inconsistencies detected or read IO failures.
141 *
142 * On ext2, we can store the error state of the filesystem in the
143 * superblock. That is not possible on ext3, because we may have other
144 * write ordering constraints on the superblock which prevent us from
145 * writing it out straight away; and given that the journal is about to
146 * be aborted, we can't rely on the current, or future, transactions to
147 * write out the superblock safely.
148 *
149 * We'll just use the journal_abort() error code to record an error in
150 * the journal instead. On recovery, the journal will compain about
151 * that error until we've noted it down and cleared it.
152 */
153
154static void ext3_handle_error(struct super_block *sb)
155{
156 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
157
158 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
159 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
160
161 if (sb->s_flags & MS_RDONLY)
162 return;
163
7543fc7b 164 if (!test_opt (sb, ERRORS_CONT)) {
1da177e4
LT		 165 journal_t *journal = EXT3_SB(sb)->s_journal;
166
167 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
168 if (journal)
169 journal_abort(journal, -EIO);
170 }
7543fc7b
VA		 171 if (test_opt (sb, ERRORS_RO)) {
172 printk (KERN_CRIT "Remounting filesystem read-only\n");
173 sb->s_flags |= MS_RDONLY;
174 }
175 ext3_commit_super(sb, es, 1);
1da177e4
LT		 176 if (test_opt(sb, ERRORS_PANIC))
177 panic("EXT3-fs (device %s): panic forced after error\n",
178 sb->s_id);
1da177e4
LT		 179}
180
181void ext3_error (struct super_block * sb, const char * function,
182 const char * fmt, ...)
183{
184 va_list args;
185
186 va_start(args, fmt);
187 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
188 vprintk(fmt, args);
189 printk("\n");
190 va_end(args);
191
192 ext3_handle_error(sb);
193}
194
195static const char *ext3_decode_error(struct super_block * sb, int errno,
196 char nbuf[16])
197{
198 char *errstr = NULL;
199
200 switch (errno) {
201 case -EIO:
202 errstr = "IO failure";
203 break;
204 case -ENOMEM:
205 errstr = "Out of memory";
206 break;
207 case -EROFS:
208 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
209 errstr = "Journal has aborted";
210 else
211 errstr = "Readonly filesystem";
212 break;
213 default:
214 /* If the caller passed in an extra buffer for unknown
215 * errors, textualise them now. Else we just return
216 * NULL. */
217 if (nbuf) {
218 /* Check for truncated error codes... */
219 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
220 errstr = nbuf;
221 }
222 break;
223 }
224
225 return errstr;
226}
227
228/* __ext3_std_error decodes expected errors from journaling functions
229 * automatically and invokes the appropriate error response. */
230
231void __ext3_std_error (struct super_block * sb, const char * function,
232 int errno)
233{
234 char nbuf[16];
30121624 235 const char *errstr;
1da177e4 236
30121624
ST		 237 /* Special case: if the error is EROFS, and we're not already
238 * inside a transaction, then there's really no point in logging
239 * an error. */
240 if (errno == -EROFS && journal_current_handle() == NULL &&
241 (sb->s_flags & MS_RDONLY))
242 return;
243
244 errstr = ext3_decode_error(sb, errno, nbuf);
1da177e4
LT		 245 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
246 sb->s_id, function, errstr);
247
248 ext3_handle_error(sb);
249}
250
251/*
252 * ext3_abort is a much stronger failure handler than ext3_error. The
253 * abort function may be used to deal with unrecoverable failures such
254 * as journal IO errors or ENOMEM at a critical moment in log management.
255 *
256 * We unconditionally force the filesystem into an ABORT|READONLY state,
257 * unless the error response on the fs has been set to panic in which
258 * case we take the easy way out and panic immediately.
259 */
260
261void ext3_abort (struct super_block * sb, const char * function,
262 const char * fmt, ...)
263{
264 va_list args;
265
266 printk (KERN_CRIT "ext3_abort called.\n");
267
268 va_start(args, fmt);
269 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
270 vprintk(fmt, args);
271 printk("\n");
272 va_end(args);
273
274 if (test_opt(sb, ERRORS_PANIC))
275 panic("EXT3-fs panic from previous error\n");
276
277 if (sb->s_flags & MS_RDONLY)
278 return;
279
280 printk(KERN_CRIT "Remounting filesystem read-only\n");
281 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
282 sb->s_flags |= MS_RDONLY;
283 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
44d6f787
HK		 284 if (EXT3_SB(sb)->s_journal)
285 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
1da177e4
LT		 286}
287
288void ext3_warning (struct super_block * sb, const char * function,
289 const char * fmt, ...)
290{
291 va_list args;
292
293 va_start(args, fmt);
294 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
295 sb->s_id, function);
296 vprintk(fmt, args);
297 printk("\n");
298 va_end(args);
299}
300
301void ext3_update_dynamic_rev(struct super_block *sb)
302{
303 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
304
305 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
306 return;
307
e05b6b52 308 ext3_warning(sb, __func__,
1da177e4
LT		 309 "updating to rev %d because of new feature flag, "
310 "running e2fsck is recommended",
311 EXT3_DYNAMIC_REV);
312
313 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
314 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
315 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
316 /* leave es->s_feature_*compat flags alone */
317 /* es->s_uuid will be set by e2fsck if empty */
318
319 /*
320 * The rest of the superblock fields should be zero, and if not it
321 * means they are likely already in use, so leave them alone. We
322 * can leave it up to e2fsck to clean up any inconsistencies there.
323 */
324}
325
326/*
327 * Open the external journal device
328 */
329static struct block_device *ext3_blkdev_get(dev_t dev)
330{
331 struct block_device *bdev;
332 char b[BDEVNAME_SIZE];
333
334 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
335 if (IS_ERR(bdev))
336 goto fail;
337 return bdev;
338
339fail:
340 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
341 __bdevname(dev, b), PTR_ERR(bdev));
342 return NULL;
343}
344
345/*
346 * Release the journal device
347 */
348static int ext3_blkdev_put(struct block_device *bdev)
349{
350 bd_release(bdev);
9a1c3542 351 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 352}
353
354static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
355{
356 struct block_device *bdev;
357 int ret = -ENODEV;
358
359 bdev = sbi->journal_bdev;
360 if (bdev) {
361 ret = ext3_blkdev_put(bdev);
362 sbi->journal_bdev = NULL;
363 }
364 return ret;
365}
366
367static inline struct inode *orphan_list_entry(struct list_head *l)
368{
369 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
370}
371
372static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
373{
374 struct list_head *l;
375
ae6ddcc5 376 printk(KERN_ERR "sb orphan head is %d\n",
1da177e4
LT		 377 le32_to_cpu(sbi->s_es->s_last_orphan));
378
379 printk(KERN_ERR "sb_info orphan list:\n");
380 list_for_each(l, &sbi->s_orphan) {
381 struct inode *inode = orphan_list_entry(l);
382 printk(KERN_ERR " "
eee194e7 383 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 384 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 385 inode->i_mode, inode->i_nlink,
1da177e4
LT		 386 NEXT_ORPHAN(inode));
387 }
388}
389
390static void ext3_put_super (struct super_block * sb)
391{
392 struct ext3_sb_info *sbi = EXT3_SB(sb);
393 struct ext3_super_block *es = sbi->s_es;
44d6f787 394 int i, err;
1da177e4
LT		 395
396 ext3_xattr_put_super(sb);
44d6f787
HK		 397 err = journal_destroy(sbi->s_journal);
398 sbi->s_journal = NULL;
399 if (err < 0)
2d7c820e 400 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 401
1da177e4
LT		 402 if (!(sb->s_flags & MS_RDONLY)) {
403 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
404 es->s_state = cpu_to_le16(sbi->s_mount_state);
405 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
406 mark_buffer_dirty(sbi->s_sbh);
407 ext3_commit_super(sb, es, 1);
408 }
409
410 for (i = 0; i < sbi->s_gdb_count; i++)
411 brelse(sbi->s_group_desc[i]);
412 kfree(sbi->s_group_desc);
413 percpu_counter_destroy(&sbi->s_freeblocks_counter);
414 percpu_counter_destroy(&sbi->s_freeinodes_counter);
415 percpu_counter_destroy(&sbi->s_dirs_counter);
416 brelse(sbi->s_sbh);
417#ifdef CONFIG_QUOTA
418 for (i = 0; i < MAXQUOTAS; i++)
419 kfree(sbi->s_qf_names[i]);
420#endif
421
422 /* Debugging code just in case the in-memory inode orphan list
423 * isn't empty. The on-disk one can be non-empty if we've
424 * detected an error and taken the fs readonly, but the
425 * in-memory list had better be clean by this point. */
426 if (!list_empty(&sbi->s_orphan))
427 dump_orphan_list(sb, sbi);
428 J_ASSERT(list_empty(&sbi->s_orphan));
429
f98393a6 430 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 431 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
432 /*
433 * Invalidate the journal device's buffers. We don't want them
434 * floating about in memory - the physical journal device may
435 * hotswapped, and it breaks the `ro-after' testing code.
436 */
437 sync_blockdev(sbi->journal_bdev);
f98393a6 438 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 439 ext3_blkdev_remove(sbi);
440 }
441 sb->s_fs_info = NULL;
5df096d6 442 kfree(sbi->s_blockgroup_lock);
1da177e4
LT		 443 kfree(sbi);
444 return;
445}
446
e18b890b 447static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 448
449/*
450 * Called inside transaction, so use GFP_NOFS
451 */
452static struct inode *ext3_alloc_inode(struct super_block *sb)
453{
454 struct ext3_inode_info *ei;
455
e6b4f8da 456 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 457 if (!ei)
458 return NULL;
459#ifdef CONFIG_EXT3_FS_POSIX_ACL
460 ei->i_acl = EXT3_ACL_NOT_CACHED;
461 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
462#endif
463 ei->i_block_alloc_info = NULL;
464 ei->vfs_inode.i_version = 1;
465 return &ei->vfs_inode;
466}
467
468static void ext3_destroy_inode(struct inode *inode)
469{
9f7dd93d
VA		 470 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
471 printk("EXT3 Inode %p: orphan list check failed!\n",
472 EXT3_I(inode));
473 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
474 EXT3_I(inode), sizeof(struct ext3_inode_info),
475 false);
476 dump_stack();
477 }
31bd2bc7 478 remove_extent_mappings(&EXT3_I(inode)->extent_tree, 0, (u64) -1);
1da177e4
LT		 479 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
480}
481
51cc5068 482static void init_once(void *foo)
1da177e4
LT		 483{
484 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
485
a35afb83 486 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 487#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 488 init_rwsem(&ei->xattr_sem);
1da177e4 489#endif
a35afb83 490 mutex_init(&ei->truncate_mutex);
31bd2bc7 491 extent_map_tree_init(&ei->extent_tree);
a35afb83 492 inode_init_once(&ei->vfs_inode);
1da177e4 493}
ae6ddcc5 494
1da177e4
LT		 495static int init_inodecache(void)
496{
497 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
498 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 499 0, (SLAB_RECLAIM_ACCOUNT|
500 SLAB_MEM_SPREAD),
20c2df83 501 init_once);
1da177e4
LT		 502 if (ext3_inode_cachep == NULL)
503 return -ENOMEM;
504 return 0;
505}
506
507static void destroy_inodecache(void)
508{
1a1d92c1 509 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 510}
511
512static void ext3_clear_inode(struct inode *inode)
513{
514 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
515#ifdef CONFIG_EXT3_FS_POSIX_ACL
e6022603
AM		 516 if (EXT3_I(inode)->i_acl &&
517 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
518 posix_acl_release(EXT3_I(inode)->i_acl);
519 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
520 }
521 if (EXT3_I(inode)->i_default_acl &&
522 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
523 posix_acl_release(EXT3_I(inode)->i_default_acl);
524 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
525 }
1da177e4
LT		 526#endif
527 ext3_discard_reservation(inode);
528 EXT3_I(inode)->i_block_alloc_info = NULL;
e6022603
AM		 529 if (unlikely(rsv))
530 kfree(rsv);
1da177e4
LT		 531}
532
6cd37cda 533static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 534{
6cd37cda 535#if defined(CONFIG_QUOTA)
275abf5b 536 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 537
8fc2751b
MB		 538 if (sbi->s_jquota_fmt)
539 seq_printf(seq, ",jqfmt=%s",
540 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
541
542 if (sbi->s_qf_names[USRQUOTA])
543 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
544
545 if (sbi->s_qf_names[GRPQUOTA])
546 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
547
548 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
549 seq_puts(seq, ",usrquota");
550
551 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
552 seq_puts(seq, ",grpquota");
553#endif
6cd37cda
PO		 554}
555
571beed8
MS		 556/*
557 * Show an option if
558 * - it's set to a non-default value OR
559 * - if the per-sb default is different from the global default
560 */
6cd37cda
PO		 561static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
562{
563 struct super_block *sb = vfs->mnt_sb;
571beed8
MS		 564 struct ext3_sb_info *sbi = EXT3_SB(sb);
565 struct ext3_super_block *es = sbi->s_es;
566 unsigned long def_mount_opts;
567
568 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
569
570 if (sbi->s_sb_block != 1)
571 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
572 if (test_opt(sb, MINIX_DF))
573 seq_puts(seq, ",minixdf");
574 if (test_opt(sb, GRPID))
575 seq_puts(seq, ",grpid");
576 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
577 seq_puts(seq, ",nogrpid");
578 if (sbi->s_resuid != EXT3_DEF_RESUID ||
579 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
580 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
581 }
582 if (sbi->s_resgid != EXT3_DEF_RESGID ||
583 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
584 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
585 }
1eca93f9 586 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 587 int def_errors = le16_to_cpu(es->s_errors);
588
589 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 590 def_errors == EXT3_ERRORS_CONTINUE) {
591 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 592 }
593 }
1eca93f9
AK		 594 if (test_opt(sb, ERRORS_CONT))
595 seq_puts(seq, ",errors=continue");
571beed8
MS		 596 if (test_opt(sb, ERRORS_PANIC))
597 seq_puts(seq, ",errors=panic");
598 if (test_opt(sb, NO_UID32))
599 seq_puts(seq, ",nouid32");
600 if (test_opt(sb, DEBUG))
601 seq_puts(seq, ",debug");
602 if (test_opt(sb, OLDALLOC))
603 seq_puts(seq, ",oldalloc");
604#ifdef CONFIG_EXT3_FS_XATTR
605 if (test_opt(sb, XATTR_USER))
606 seq_puts(seq, ",user_xattr");
607 if (!test_opt(sb, XATTR_USER) &&
608 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
609 seq_puts(seq, ",nouser_xattr");
610 }
611#endif
612#ifdef CONFIG_EXT3_FS_POSIX_ACL
613 if (test_opt(sb, POSIX_ACL))
614 seq_puts(seq, ",acl");
615 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
616 seq_puts(seq, ",noacl");
617#endif
618 if (!test_opt(sb, RESERVATION))
619 seq_puts(seq, ",noreservation");
620 if (sbi->s_commit_interval) {
621 seq_printf(seq, ",commit=%u",
622 (unsigned) (sbi->s_commit_interval / HZ));
623 }
624 if (test_opt(sb, BARRIER))
625 seq_puts(seq, ",barrier=1");
626 if (test_opt(sb, NOBH))
627 seq_puts(seq, ",nobh");
6cd37cda
PO		 628
629 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
630 seq_puts(seq, ",data=journal");
631 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
632 seq_puts(seq, ",data=ordered");
633 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
634 seq_puts(seq, ",data=writeback");
635
0e4fb5e2
HK		 636 if (test_opt(sb, DATA_ERR_ABORT))
637 seq_puts(seq, ",data_err=abort");
638
6cd37cda 639 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 640
641 return 0;
642}
1da177e4 643
fdb36673 644
74af0baa
CH		 645static struct inode *ext3_nfs_get_inode(struct super_block *sb,
646 u64 ino, u32 generation)
fdb36673 647{
fdb36673 648 struct inode *inode;
fdb36673
N		 649
650 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
651 return ERR_PTR(-ESTALE);
652 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
653 return ERR_PTR(-ESTALE);
654
655 /* iget isn't really right if the inode is currently unallocated!!
656 *
657 * ext3_read_inode will return a bad_inode if the inode had been
658 * deleted, so we should be safe.
659 *
660 * Currently we don't know the generation for parent directory, so
661 * a generation of 0 means "accept any"
662 */
473043dc
DH		 663 inode = ext3_iget(sb, ino);
664 if (IS_ERR(inode))
665 return ERR_CAST(inode);
666 if (generation && inode->i_generation != generation) {
fdb36673
N		 667 iput(inode);
668 return ERR_PTR(-ESTALE);
669 }
74af0baa
CH		 670
671 return inode;
672}
673
674static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
675 int fh_len, int fh_type)
676{
677 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
678 ext3_nfs_get_inode);
679}
680
681static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
682 int fh_len, int fh_type)
683{
684 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
685 ext3_nfs_get_inode);
fdb36673
N		 686}
687
6b082b53
TO		 688/*
689 * Try to release metadata pages (indirect blocks, directories) which are
690 * mapped via the block device. Since these pages could have journal heads
691 * which would prevent try_to_free_buffers() from freeing them, we must use
692 * jbd layer's try_to_free_buffers() function to release them.
693 */
694static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
695 gfp_t wait)
696{
697 journal_t *journal = EXT3_SB(sb)->s_journal;
698
699 WARN_ON(PageChecked(page));
700 if (!page_has_buffers(page))
701 return 0;
702 if (journal)
703 return journal_try_to_free_buffers(journal, page,
704 wait & ~__GFP_WAIT);
705 return try_to_free_buffers(page);
706}
707
8fc2751b 708#ifdef CONFIG_QUOTA
1da177e4
LT		 709#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
710#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
711
712static int ext3_dquot_initialize(struct inode *inode, int type);
713static int ext3_dquot_drop(struct inode *inode);
714static int ext3_write_dquot(struct dquot *dquot);
715static int ext3_acquire_dquot(struct dquot *dquot);
716static int ext3_release_dquot(struct dquot *dquot);
717static int ext3_mark_dquot_dirty(struct dquot *dquot);
718static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f
JK		 719static int ext3_quota_on(struct super_block *sb, int type, int format_id,
720 char *path, int remount);
1da177e4
LT		 721static int ext3_quota_on_mount(struct super_block *sb, int type);
722static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
723 size_t len, loff_t off);
724static ssize_t ext3_quota_write(struct super_block *sb, int type,
725 const char *data, size_t len, loff_t off);
726
727static struct dquot_operations ext3_quota_operations = {
728 .initialize = ext3_dquot_initialize,
729 .drop = ext3_dquot_drop,
730 .alloc_space = dquot_alloc_space,
731 .alloc_inode = dquot_alloc_inode,
732 .free_space = dquot_free_space,
733 .free_inode = dquot_free_inode,
734 .transfer = dquot_transfer,
735 .write_dquot = ext3_write_dquot,
736 .acquire_dquot = ext3_acquire_dquot,
737 .release_dquot = ext3_release_dquot,
738 .mark_dirty = ext3_mark_dquot_dirty,
157091a2
JK		 739 .write_info = ext3_write_info,
740 .alloc_dquot = dquot_alloc,
741 .destroy_dquot = dquot_destroy,
1da177e4
LT		 742};
743
744static struct quotactl_ops ext3_qctl_operations = {
745 .quota_on = ext3_quota_on,
746 .quota_off = vfs_quota_off,
747 .quota_sync = vfs_quota_sync,
748 .get_info = vfs_get_dqinfo,
749 .set_info = vfs_set_dqinfo,
750 .get_dqblk = vfs_get_dqblk,
751 .set_dqblk = vfs_set_dqblk
752};
753#endif
754
ee9b6d61 755static const struct super_operations ext3_sops = {
1da177e4
LT		 756 .alloc_inode = ext3_alloc_inode,
757 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 758 .write_inode = ext3_write_inode,
759 .dirty_inode = ext3_dirty_inode,
760 .delete_inode = ext3_delete_inode,
761 .put_super = ext3_put_super,
762 .write_super = ext3_write_super,
763 .sync_fs = ext3_sync_fs,
c4be0c1d
TS		 764 .freeze_fs = ext3_freeze,
765 .unfreeze_fs = ext3_unfreeze,
1da177e4
LT		 766 .statfs = ext3_statfs,
767 .remount_fs = ext3_remount,
768 .clear_inode = ext3_clear_inode,
8fc2751b 769 .show_options = ext3_show_options,
1da177e4
LT		 770#ifdef CONFIG_QUOTA
771 .quota_read = ext3_quota_read,
772 .quota_write = ext3_quota_write,
773#endif
6b082b53 774 .bdev_try_to_free_page = bdev_try_to_free_page,
1da177e4
LT		 775};
776
39655164 777static const struct export_operations ext3_export_ops = {
74af0baa
CH		 778 .fh_to_dentry = ext3_fh_to_dentry,
779 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 780 .get_parent = ext3_get_parent,
781};
782
783enum {
784 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
785 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 786 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 787 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 788 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 789 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
1da177e4 790 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 791 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 792 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1f54587b 793 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
8fc2751b
MB		 794 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
795 Opt_grpquota
1da177e4
LT		 796};
797
a447c093 798static const match_table_t tokens = {
1da177e4
LT		 799 {Opt_bsd_df, "bsddf"},
800 {Opt_minix_df, "minixdf"},
801 {Opt_grpid, "grpid"},
802 {Opt_grpid, "bsdgroups"},
803 {Opt_nogrpid, "nogrpid"},
804 {Opt_nogrpid, "sysvgroups"},
805 {Opt_resgid, "resgid=%u"},
806 {Opt_resuid, "resuid=%u"},
807 {Opt_sb, "sb=%u"},
808 {Opt_err_cont, "errors=continue"},
809 {Opt_err_panic, "errors=panic"},
810 {Opt_err_ro, "errors=remount-ro"},
811 {Opt_nouid32, "nouid32"},
812 {Opt_nocheck, "nocheck"},
813 {Opt_nocheck, "check=none"},
1da177e4
LT		 814 {Opt_debug, "debug"},
815 {Opt_oldalloc, "oldalloc"},
816 {Opt_orlov, "orlov"},
817 {Opt_user_xattr, "user_xattr"},
818 {Opt_nouser_xattr, "nouser_xattr"},
819 {Opt_acl, "acl"},
820 {Opt_noacl, "noacl"},
821 {Opt_reservation, "reservation"},
822 {Opt_noreservation, "noreservation"},
823 {Opt_noload, "noload"},
824 {Opt_nobh, "nobh"},
ade1a29e 825 {Opt_bh, "bh"},
1da177e4
LT		 826 {Opt_commit, "commit=%u"},
827 {Opt_journal_update, "journal=update"},
828 {Opt_journal_inum, "journal=%u"},
71b96257 829 {Opt_journal_dev, "journal_dev=%u"},
1da177e4
LT		 830 {Opt_abort, "abort"},
831 {Opt_data_journal, "data=journal"},
832 {Opt_data_ordered, "data=ordered"},
833 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 834 {Opt_data_err_abort, "data_err=abort"},
835 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 836 {Opt_offusrjquota, "usrjquota="},
837 {Opt_usrjquota, "usrjquota=%s"},
838 {Opt_offgrpjquota, "grpjquota="},
839 {Opt_grpjquota, "grpjquota=%s"},
840 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
841 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
8fc2751b 842 {Opt_grpquota, "grpquota"},
1f54587b
JK		 843 {Opt_noquota, "noquota"},
844 {Opt_quota, "quota"},
8fc2751b 845 {Opt_usrquota, "usrquota"},
1da177e4 846 {Opt_barrier, "barrier=%u"},
1da177e4 847 {Opt_resize, "resize"},
92587216 848 {Opt_err, NULL},
1da177e4
LT		 849};
850
43d23f90 851static ext3_fsblk_t get_sb_block(void **data)
1da177e4 852{
e9ad5620
DK		 853 ext3_fsblk_t sb_block;
854 char *options = (char *) *data;
1da177e4
LT		 855
856 if (!options || strncmp(options, "sb=", 3) != 0)
857 return 1; /* Default location */
858 options += 3;
43d23f90 859 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 860 sb_block = simple_strtoul(options, &options, 0);
861 if (*options && *options != ',') {
862 printk("EXT3-fs: Invalid sb specification: %s\n",
863 (char *) *data);
864 return 1;
865 }
866 if (*options == ',')
867 options++;
868 *data = (void *) options;
869 return sb_block;
870}
871
71b96257 872static int parse_options (char *options, struct super_block *sb,
eee194e7 873 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 874 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 875{
876 struct ext3_sb_info *sbi = EXT3_SB(sb);
877 char * p;
878 substring_t args[MAX_OPT_ARGS];
879 int data_opt = 0;
880 int option;
881#ifdef CONFIG_QUOTA
d06bf1d2 882 int qtype, qfmt;
1da177e4
LT		 883 char *qname;
884#endif
885
886 if (!options)
887 return 1;
888
889 while ((p = strsep (&options, ",")) != NULL) {
890 int token;
891 if (!*p)
892 continue;
893
894 token = match_token(p, tokens, args);
895 switch (token) {
896 case Opt_bsd_df:
897 clear_opt (sbi->s_mount_opt, MINIX_DF);
898 break;
899 case Opt_minix_df:
900 set_opt (sbi->s_mount_opt, MINIX_DF);
901 break;
902 case Opt_grpid:
903 set_opt (sbi->s_mount_opt, GRPID);
904 break;
905 case Opt_nogrpid:
906 clear_opt (sbi->s_mount_opt, GRPID);
907 break;
908 case Opt_resuid:
909 if (match_int(&args[0], &option))
910 return 0;
911 sbi->s_resuid = option;
912 break;
913 case Opt_resgid:
914 if (match_int(&args[0], &option))
915 return 0;
916 sbi->s_resgid = option;
917 break;
918 case Opt_sb:
919 /* handled by get_sb_block() instead of here */
920 /* *sb_block = match_int(&args[0]); */
921 break;
922 case Opt_err_panic:
923 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
924 clear_opt (sbi->s_mount_opt, ERRORS_RO);
925 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
926 break;
927 case Opt_err_ro:
928 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
929 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
930 set_opt (sbi->s_mount_opt, ERRORS_RO);
931 break;
932 case Opt_err_cont:
933 clear_opt (sbi->s_mount_opt, ERRORS_RO);
934 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
935 set_opt (sbi->s_mount_opt, ERRORS_CONT);
936 break;
937 case Opt_nouid32:
938 set_opt (sbi->s_mount_opt, NO_UID32);
939 break;
1da177e4
LT		 940 case Opt_nocheck:
941 clear_opt (sbi->s_mount_opt, CHECK);
942 break;
943 case Opt_debug:
944 set_opt (sbi->s_mount_opt, DEBUG);
945 break;
946 case Opt_oldalloc:
947 set_opt (sbi->s_mount_opt, OLDALLOC);
948 break;
949 case Opt_orlov:
950 clear_opt (sbi->s_mount_opt, OLDALLOC);
951 break;
952#ifdef CONFIG_EXT3_FS_XATTR
953 case Opt_user_xattr:
954 set_opt (sbi->s_mount_opt, XATTR_USER);
955 break;
956 case Opt_nouser_xattr:
957 clear_opt (sbi->s_mount_opt, XATTR_USER);
958 break;
959#else
960 case Opt_user_xattr:
961 case Opt_nouser_xattr:
962 printk("EXT3 (no)user_xattr options not supported\n");
963 break;
964#endif
965#ifdef CONFIG_EXT3_FS_POSIX_ACL
966 case Opt_acl:
967 set_opt(sbi->s_mount_opt, POSIX_ACL);
968 break;
969 case Opt_noacl:
970 clear_opt(sbi->s_mount_opt, POSIX_ACL);
971 break;
972#else
973 case Opt_acl:
974 case Opt_noacl:
975 printk("EXT3 (no)acl options not supported\n");
976 break;
977#endif
978 case Opt_reservation:
979 set_opt(sbi->s_mount_opt, RESERVATION);
980 break;
981 case Opt_noreservation:
982 clear_opt(sbi->s_mount_opt, RESERVATION);
983 break;
984 case Opt_journal_update:
985 /* @@@ FIXME */
986 /* Eventually we will want to be able to create
987 a journal file here. For now, only allow the
988 user to specify an existing inode to be the
989 journal file. */
990 if (is_remount) {
991 printk(KERN_ERR "EXT3-fs: cannot specify "
992 "journal on remount\n");
993 return 0;
994 }
995 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
996 break;
997 case Opt_journal_inum:
998 if (is_remount) {
999 printk(KERN_ERR "EXT3-fs: cannot specify "
1000 "journal on remount\n");
1001 return 0;
1002 }
1003 if (match_int(&args[0], &option))
1004 return 0;
1005 *inum = option;
1006 break;
71b96257
JL		 1007 case Opt_journal_dev:
1008 if (is_remount) {
1009 printk(KERN_ERR "EXT3-fs: cannot specify "
1010 "journal on remount\n");
1011 return 0;
1012 }
1013 if (match_int(&args[0], &option))
1014 return 0;
1015 *journal_devnum = option;
1016 break;
1da177e4
LT		 1017 case Opt_noload:
1018 set_opt (sbi->s_mount_opt, NOLOAD);
1019 break;
1020 case Opt_commit:
1021 if (match_int(&args[0], &option))
1022 return 0;
1023 if (option < 0)
1024 return 0;
1025 if (option == 0)
1026 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1027 sbi->s_commit_interval = HZ * option;
1028 break;
1029 case Opt_data_journal:
1030 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1031 goto datacheck;
1032 case Opt_data_ordered:
1033 data_opt = EXT3_MOUNT_ORDERED_DATA;
1034 goto datacheck;
1035 case Opt_data_writeback:
1036 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1037 datacheck:
1038 if (is_remount) {
1039 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1040 != data_opt) {
1041 printk(KERN_ERR
1042 "EXT3-fs: cannot change data "
1043 "mode on remount\n");
1044 return 0;
1045 }
1046 } else {
1047 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1048 sbi->s_mount_opt |= data_opt;
1049 }
1050 break;
0e4fb5e2
HK		 1051 case Opt_data_err_abort:
1052 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1053 break;
1054 case Opt_data_err_ignore:
1055 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1056 break;
1da177e4
LT		 1057#ifdef CONFIG_QUOTA
1058 case Opt_usrjquota:
1059 qtype = USRQUOTA;
1060 goto set_qf_name;
1061 case Opt_grpjquota:
1062 qtype = GRPQUOTA;
1063set_qf_name:
ee0d5ffe 1064 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1065 !sbi->s_qf_names[qtype]) {
1da177e4 1066 printk(KERN_ERR
99aeaf63 1067 "EXT3-fs: Cannot change journaled "
1da177e4
LT		 1068 "quota options when quota turned on.\n");
1069 return 0;
1070 }
1071 qname = match_strdup(&args[0]);
1072 if (!qname) {
1073 printk(KERN_ERR
1074 "EXT3-fs: not enough memory for "
1075 "storing quotafile name.\n");
1076 return 0;
1077 }
1078 if (sbi->s_qf_names[qtype] &&
1079 strcmp(sbi->s_qf_names[qtype], qname)) {
1080 printk(KERN_ERR
1081 "EXT3-fs: %s quota file already "
1082 "specified.\n", QTYPE2NAME(qtype));
1083 kfree(qname);
1084 return 0;
1085 }
1086 sbi->s_qf_names[qtype] = qname;
1087 if (strchr(sbi->s_qf_names[qtype], '/')) {
1088 printk(KERN_ERR
1089 "EXT3-fs: quotafile must be on "
1090 "filesystem root.\n");
1091 kfree(sbi->s_qf_names[qtype]);
1092 sbi->s_qf_names[qtype] = NULL;
1093 return 0;
1094 }
1f54587b 1095 set_opt(sbi->s_mount_opt, QUOTA);
1da177e4
LT		 1096 break;
1097 case Opt_offusrjquota:
1098 qtype = USRQUOTA;
1099 goto clear_qf_name;
1100 case Opt_offgrpjquota:
1101 qtype = GRPQUOTA;
1102clear_qf_name:
ee0d5ffe 1103 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1104 sbi->s_qf_names[qtype]) {
1da177e4 1105 printk(KERN_ERR "EXT3-fs: Cannot change "
99aeaf63 1106 "journaled quota options when "
1da177e4
LT		 1107 "quota turned on.\n");
1108 return 0;
1109 }
08c6a96f
JK		 1110 /*
1111 * The space will be released later when all options
1112 * are confirmed to be correct
1113 */
1da177e4
LT		 1114 sbi->s_qf_names[qtype] = NULL;
1115 break;
1116 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1117 qfmt = QFMT_VFS_OLD;
1118 goto set_qf_format;
1da177e4 1119 case Opt_jqfmt_vfsv0:
d06bf1d2
JK		 1120 qfmt = QFMT_VFS_V0;
1121set_qf_format:
ee0d5ffe 1122 if (sb_any_quota_loaded(sb) &&
d06bf1d2
JK		 1123 sbi->s_jquota_fmt != qfmt) {
1124 printk(KERN_ERR "EXT3-fs: Cannot change "
1125 "journaled quota options when "
1126 "quota turned on.\n");
1127 return 0;
1128 }
1129 sbi->s_jquota_fmt = qfmt;
1da177e4 1130 break;
1f54587b 1131 case Opt_quota:
8fc2751b
MB		 1132 case Opt_usrquota:
1133 set_opt(sbi->s_mount_opt, QUOTA);
1134 set_opt(sbi->s_mount_opt, USRQUOTA);
1135 break;
1136 case Opt_grpquota:
1f54587b 1137 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1138 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1139 break;
1140 case Opt_noquota:
ee0d5ffe 1141 if (sb_any_quota_loaded(sb)) {
1f54587b
JK		 1142 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1143 "options when quota turned on.\n");
1144 return 0;
1145 }
1146 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1147 clear_opt(sbi->s_mount_opt, USRQUOTA);
1148 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1149 break;
1da177e4 1150#else
8fc2751b
MB		 1151 case Opt_quota:
1152 case Opt_usrquota:
1153 case Opt_grpquota:
fa1ff1e0
JK		 1154 printk(KERN_ERR
1155 "EXT3-fs: quota options not supported.\n");
1156 break;
1da177e4
LT		 1157 case Opt_usrjquota:
1158 case Opt_grpjquota:
1159 case Opt_offusrjquota:
1160 case Opt_offgrpjquota:
1161 case Opt_jqfmt_vfsold:
1162 case Opt_jqfmt_vfsv0:
1163 printk(KERN_ERR
fa1ff1e0 1164 "EXT3-fs: journaled quota options not "
1da177e4
LT		 1165 "supported.\n");
1166 break;
1f54587b
JK		 1167 case Opt_noquota:
1168 break;
1da177e4
LT		 1169#endif
1170 case Opt_abort:
1171 set_opt(sbi->s_mount_opt, ABORT);
1172 break;
1173 case Opt_barrier:
1174 if (match_int(&args[0], &option))
1175 return 0;
1176 if (option)
1177 set_opt(sbi->s_mount_opt, BARRIER);
1178 else
1179 clear_opt(sbi->s_mount_opt, BARRIER);
1180 break;
1181 case Opt_ignore:
1182 break;
1183 case Opt_resize:
08c6a96f 1184 if (!is_remount) {
1da177e4
LT		 1185 printk("EXT3-fs: resize option only available "
1186 "for remount\n");
1187 return 0;
1188 }
c7f1721e
KZ		 1189 if (match_int(&args[0], &option) != 0)
1190 return 0;
1da177e4
LT		 1191 *n_blocks_count = option;
1192 break;
1193 case Opt_nobh:
1194 set_opt(sbi->s_mount_opt, NOBH);
1195 break;
ade1a29e
BP		 1196 case Opt_bh:
1197 clear_opt(sbi->s_mount_opt, NOBH);
1198 break;
1da177e4
LT		 1199 default:
1200 printk (KERN_ERR
1201 "EXT3-fs: Unrecognized mount option \"%s\" "
1202 "or missing value\n", p);
1203 return 0;
1204 }
1205 }
1206#ifdef CONFIG_QUOTA
8fc2751b
MB		 1207 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1208 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1209 sbi->s_qf_names[USRQUOTA])
1210 clear_opt(sbi->s_mount_opt, USRQUOTA);
1211
1212 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1213 sbi->s_qf_names[GRPQUOTA])
1214 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1215
1216 if ((sbi->s_qf_names[USRQUOTA] &&
1217 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1218 (sbi->s_qf_names[GRPQUOTA] &&
1219 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1220 printk(KERN_ERR "EXT3-fs: old and new quota "
1221 "format mixing.\n");
1222 return 0;
1223 }
1224
1225 if (!sbi->s_jquota_fmt) {
99aeaf63 1226 printk(KERN_ERR "EXT3-fs: journaled quota format "
8fc2751b
MB		 1227 "not specified.\n");
1228 return 0;
1229 }
1230 } else {
1231 if (sbi->s_jquota_fmt) {
99aeaf63
JK		 1232 printk(KERN_ERR "EXT3-fs: journaled quota format "
1233 "specified with no journaling "
8fc2751b
MB		 1234 "enabled.\n");
1235 return 0;
1236 }
1da177e4
LT		 1237 }
1238#endif
1da177e4
LT		 1239 return 1;
1240}
1241
1242static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1243 int read_only)
1244{
1245 struct ext3_sb_info *sbi = EXT3_SB(sb);
1246 int res = 0;
1247
1248 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1249 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1250 "forcing read-only mode\n");
1251 res = MS_RDONLY;
1252 }
1253 if (read_only)
1254 return res;
1255 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1256 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1257 "running e2fsck is recommended\n");
1258 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1259 printk (KERN_WARNING
1260 "EXT3-fs warning: mounting fs with errors, "
1261 "running e2fsck is recommended\n");
1262 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1263 le16_to_cpu(es->s_mnt_count) >=
1264 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1265 printk (KERN_WARNING
1266 "EXT3-fs warning: maximal mount count reached, "
1267 "running e2fsck is recommended\n");
1268 else if (le32_to_cpu(es->s_checkinterval) &&
1269 (le32_to_cpu(es->s_lastcheck) +
1270 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1271 printk (KERN_WARNING
1272 "EXT3-fs warning: checktime reached, "
1273 "running e2fsck is recommended\n");
1274#if 0
1275 /* @@@ We _will_ want to clear the valid bit if we find
1276 inconsistencies, to force a fsck at reboot. But for
1277 a plain journaled filesystem we can keep it set as
1278 valid forever! :) */
e7f23ebd 1279 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4
LT		 1280#endif
1281 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1282 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1283 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1284 es->s_mtime = cpu_to_le32(get_seconds());
1285 ext3_update_dynamic_rev(sb);
1286 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1287
1288 ext3_commit_super(sb, es, 1);
1289 if (test_opt(sb, DEBUG))
1290 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1291 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1292 sb->s_blocksize,
1293 sbi->s_groups_count,
1294 EXT3_BLOCKS_PER_GROUP(sb),
1295 EXT3_INODES_PER_GROUP(sb),
1296 sbi->s_mount_opt);
1297
1298 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1299 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1300 char b[BDEVNAME_SIZE];
1301
1302 printk("external journal on %s\n",
1303 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1304 } else {
1305 printk("internal journal\n");
1306 }
1da177e4
LT		 1307 return res;
1308}
1309
1310/* Called at mount-time, super-block is locked */
197cd65a 1311static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1312{
1313 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1314 int i;
1315
1316 ext3_debug ("Checking group descriptors");
1317
197cd65a
AM		 1318 for (i = 0; i < sbi->s_groups_count; i++) {
1319 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1320 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1321 ext3_fsblk_t last_block;
197cd65a 1322
855565e8
ES		 1323 if (i == sbi->s_groups_count - 1)
1324 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1325 else
1326 last_block = first_block +
1327 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1328
855565e8
ES		 1329 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1330 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1331 {
1332 ext3_error (sb, "ext3_check_descriptors",
1333 "Block bitmap for group %d"
1334 " not in group (block %lu)!",
1335 i, (unsigned long)
1336 le32_to_cpu(gdp->bg_block_bitmap));
1337 return 0;
1338 }
855565e8
ES		 1339 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1340 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1341 {
1342 ext3_error (sb, "ext3_check_descriptors",
1343 "Inode bitmap for group %d"
1344 " not in group (block %lu)!",
1345 i, (unsigned long)
1346 le32_to_cpu(gdp->bg_inode_bitmap));
1347 return 0;
1348 }
855565e8 1349 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1350 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1351 last_block)
1da177e4
LT		 1352 {
1353 ext3_error (sb, "ext3_check_descriptors",
1354 "Inode table for group %d"
1355 " not in group (block %lu)!",
1356 i, (unsigned long)
1357 le32_to_cpu(gdp->bg_inode_table));
1358 return 0;
1359 }
1da177e4
LT		 1360 }
1361
1362 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1363 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1364 return 1;
1365}
1366
1367
1368/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1369 * the superblock) which were deleted from all directories, but held open by
1370 * a process at the time of a crash. We walk the list and try to delete these
1371 * inodes at recovery time (only with a read-write filesystem).
1372 *
1373 * In order to keep the orphan inode chain consistent during traversal (in
1374 * case of crash during recovery), we link each inode into the superblock
1375 * orphan list_head and handle it the same way as an inode deletion during
1376 * normal operation (which journals the operations for us).
1377 *
1378 * We only do an iget() and an iput() on each inode, which is very safe if we
1379 * accidentally point at an in-use or already deleted inode. The worst that
1380 * can happen in this case is that we get a "bit already cleared" message from
1381 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1382 * e2fsck was run on this filesystem, and it must have already done the orphan
1383 * inode cleanup for us, so we can safely abort without any further action.
1384 */
1385static void ext3_orphan_cleanup (struct super_block * sb,
1386 struct ext3_super_block * es)
1387{
1388 unsigned int s_flags = sb->s_flags;
1389 int nr_orphans = 0, nr_truncates = 0;
1390#ifdef CONFIG_QUOTA
1391 int i;
1392#endif
1393 if (!es->s_last_orphan) {
1394 jbd_debug(4, "no orphan inodes to clean up\n");
1395 return;
1396 }
1397
a8f48a95
ES		 1398 if (bdev_read_only(sb->s_bdev)) {
1399 printk(KERN_ERR "EXT3-fs: write access "
1400 "unavailable, skipping orphan cleanup.\n");
1401 return;
1402 }
1403
1da177e4
LT		 1404 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1405 if (es->s_last_orphan)
1406 jbd_debug(1, "Errors on filesystem, "
1407 "clearing orphan list.\n");
1408 es->s_last_orphan = 0;
1409 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1410 return;
1411 }
1412
1413 if (s_flags & MS_RDONLY) {
1414 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1415 sb->s_id);
1416 sb->s_flags &= ~MS_RDONLY;
1417 }
1418#ifdef CONFIG_QUOTA
1419 /* Needed for iput() to work correctly and not trash data */
1420 sb->s_flags |= MS_ACTIVE;
1421 /* Turn on quotas so that they are updated correctly */
1422 for (i = 0; i < MAXQUOTAS; i++) {
1423 if (EXT3_SB(sb)->s_qf_names[i]) {
1424 int ret = ext3_quota_on_mount(sb, i);
1425 if (ret < 0)
1426 printk(KERN_ERR
99aeaf63 1427 "EXT3-fs: Cannot turn on journaled "
1da177e4
LT		 1428 "quota: error %d\n", ret);
1429 }
1430 }
1431#endif
1432
1433 while (es->s_last_orphan) {
1434 struct inode *inode;
1435
473043dc
DH		 1436 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1437 if (IS_ERR(inode)) {
1da177e4
LT		 1438 es->s_last_orphan = 0;
1439 break;
1440 }
1441
1442 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1443 DQUOT_INIT(inode);
1444 if (inode->i_nlink) {
1445 printk(KERN_DEBUG
eee194e7 1446 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1447 __func__, inode->i_ino, inode->i_size);
eee194e7 1448 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1449 inode->i_ino, inode->i_size);
1450 ext3_truncate(inode);
1451 nr_truncates++;
1452 } else {
1453 printk(KERN_DEBUG
eee194e7 1454 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1455 __func__, inode->i_ino);
eee194e7 1456 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1457 inode->i_ino);
1458 nr_orphans++;
1459 }
1460 iput(inode); /* The delete magic happens here! */
1461 }
1462
1463#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1464
1465 if (nr_orphans)
1466 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1467 sb->s_id, PLURAL(nr_orphans));
1468 if (nr_truncates)
1469 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1470 sb->s_id, PLURAL(nr_truncates));
1471#ifdef CONFIG_QUOTA
1472 /* Turn quotas off */
1473 for (i = 0; i < MAXQUOTAS; i++) {
1474 if (sb_dqopt(sb)->files[i])
2fd83a4f 1475 vfs_quota_off(sb, i, 0);
1da177e4
LT		 1476 }
1477#endif
1478 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1479}
1480
1da177e4
LT		 1481/*
1482 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1483 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1484 * We need to be 1 filesystem block less than the 2^32 sector limit.
1485 */
1486static loff_t ext3_max_size(int bits)
1487{
1488 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1489 int meta_blocks;
1490 loff_t upper_limit;
1491
1492 /* This is calculated to be the largest file size for a
1493 * dense, file such that the total number of
1da177e4 1494 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1495 * does not exceed 2^32 -1
1496 * __u32 i_blocks representing the total number of
1497 * 512 bytes blocks of the file
1498 */
1499 upper_limit = (1LL << 32) - 1;
1500
1501 /* total blocks in file system block size */
1502 upper_limit >>= (bits - 9);
1503
1504
1505 /* indirect blocks */
1506 meta_blocks = 1;
1507 /* double indirect blocks */
1508 meta_blocks += 1 + (1LL << (bits-2));
1509 /* tripple indirect blocks */
1510 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1511
1512 upper_limit -= meta_blocks;
1513 upper_limit <<= bits;
1da177e4
LT		 1514
1515 res += 1LL << (bits-2);
1516 res += 1LL << (2*(bits-2));
1517 res += 1LL << (3*(bits-2));
1518 res <<= bits;
1519 if (res > upper_limit)
1520 res = upper_limit;
fe7fdc37
AK		 1521
1522 if (res > MAX_LFS_FILESIZE)
1523 res = MAX_LFS_FILESIZE;
1524
1da177e4
LT		 1525 return res;
1526}
1527
43d23f90
MC		 1528static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1529 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1530 int nr)
1531{
1532 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1533 unsigned long bg, first_meta_bg;
1da177e4
LT		 1534 int has_super = 0;
1535
1da177e4
LT		 1536 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1537
1538 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1539 nr < first_meta_bg)
1540 return (logic_sb_block + nr + 1);
1541 bg = sbi->s_desc_per_block * nr;
1542 if (ext3_bg_has_super(sb, bg))
1543 has_super = 1;
43d23f90 1544 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1545}
1546
1547
1548static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1549{
1550 struct buffer_head * bh;
1551 struct ext3_super_block *es = NULL;
1552 struct ext3_sb_info *sbi;
43d23f90
MC		 1553 ext3_fsblk_t block;
1554 ext3_fsblk_t sb_block = get_sb_block(&data);
1555 ext3_fsblk_t logic_sb_block;
1da177e4 1556 unsigned long offset = 0;
eee194e7 1557 unsigned int journal_inum = 0;
71b96257 1558 unsigned long journal_devnum = 0;
1da177e4
LT		 1559 unsigned long def_mount_opts;
1560 struct inode *root;
1561 int blocksize;
1562 int hblock;
1563 int db_count;
1564 int i;
1565 int needs_recovery;
473043dc 1566 int ret = -EINVAL;
1da177e4 1567 __le32 features;
833f4077 1568 int err;
1da177e4 1569
f8314dc6 1570 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1571 if (!sbi)
1572 return -ENOMEM;
5df096d6
PE		 1573
1574 sbi->s_blockgroup_lock =
1575 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1576 if (!sbi->s_blockgroup_lock) {
1577 kfree(sbi);
1578 return -ENOMEM;
1579 }
1da177e4 1580 sb->s_fs_info = sbi;
1da177e4
LT		 1581 sbi->s_mount_opt = 0;
1582 sbi->s_resuid = EXT3_DEF_RESUID;
1583 sbi->s_resgid = EXT3_DEF_RESGID;
571beed8 1584 sbi->s_sb_block = sb_block;
1da177e4
LT		 1585
1586 unlock_kernel();
1587
1588 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1589 if (!blocksize) {
1590 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1591 goto out_fail;
1592 }
1593
1594 /*
1595 * The ext3 superblock will not be buffer aligned for other than 1kB
1596 * block sizes. We need to calculate the offset from buffer start.
1597 */
1598 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1599 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1600 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1601 } else {
1602 logic_sb_block = sb_block;
1603 }
1604
1605 if (!(bh = sb_bread(sb, logic_sb_block))) {
1606 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1607 goto out_fail;
1608 }
1609 /*
1610 * Note: s_es must be initialized as soon as possible because
1611 * some ext3 macro-instructions depend on its value
1612 */
1613 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1614 sbi->s_es = es;
1615 sb->s_magic = le16_to_cpu(es->s_magic);
1616 if (sb->s_magic != EXT3_SUPER_MAGIC)
1617 goto cantfind_ext3;
1618
1619 /* Set defaults before we parse the mount options */
1620 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1621 if (def_mount_opts & EXT3_DEFM_DEBUG)
1622 set_opt(sbi->s_mount_opt, DEBUG);
1623 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1624 set_opt(sbi->s_mount_opt, GRPID);
1625 if (def_mount_opts & EXT3_DEFM_UID16)
1626 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1627#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1628 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1629 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1630#endif
1631#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1632 if (def_mount_opts & EXT3_DEFM_ACL)
1633 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1634#endif
1da177e4
LT		 1635 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1636 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1637 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1638 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1639 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1640 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1641
1642 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1643 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1644 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1645 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1646 else
1647 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 1648
1649 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1650 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1651
1652 set_opt(sbi->s_mount_opt, RESERVATION);
1653
71b96257
JL		 1654 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1655 NULL, 0))
1da177e4
LT		 1656 goto failed_mount;
1657
1658 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1659 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1660
1661 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1662 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1663 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1664 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ae6ddcc5 1665 printk(KERN_WARNING
1da177e4
LT		 1666 "EXT3-fs warning: feature flags set on rev 0 fs, "
1667 "running e2fsck is recommended\n");
1668 /*
1669 * Check feature flags regardless of the revision level, since we
1670 * previously didn't change the revision level when setting the flags,
1671 * so there is a chance incompat flags are set on a rev 0 filesystem.
1672 */
1673 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1674 if (features) {
1675 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1676 "unsupported optional features (%x).\n",
1677 sb->s_id, le32_to_cpu(features));
1678 goto failed_mount;
1679 }
1680 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1681 if (!(sb->s_flags & MS_RDONLY) && features) {
1682 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1683 "unsupported optional features (%x).\n",
1684 sb->s_id, le32_to_cpu(features));
1685 goto failed_mount;
1686 }
1687 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1688
1689 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1690 blocksize > EXT3_MAX_BLOCK_SIZE) {
ae6ddcc5 1691 printk(KERN_ERR
1da177e4
LT		 1692 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1693 blocksize, sb->s_id);
1694 goto failed_mount;
1695 }
1696
1697 hblock = bdev_hardsect_size(sb->s_bdev);
1698 if (sb->s_blocksize != blocksize) {
1699 /*
1700 * Make sure the blocksize for the filesystem is larger
1701 * than the hardware sectorsize for the machine.
1702 */
1703 if (blocksize < hblock) {
1704 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1705 "device blocksize %d.\n", blocksize, hblock);
1706 goto failed_mount;
1707 }
1708
1709 brelse (bh);
0f0a89eb
TS		 1710 if (!sb_set_blocksize(sb, blocksize)) {
1711 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1712 blocksize);
1713 goto out_fail;
1714 }
1da177e4
LT		 1715 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1716 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1717 bh = sb_bread(sb, logic_sb_block);
1718 if (!bh) {
ae6ddcc5 1719 printk(KERN_ERR
1da177e4
LT		 1720 "EXT3-fs: Can't read superblock on 2nd try.\n");
1721 goto failed_mount;
1722 }
1723 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1724 sbi->s_es = es;
1725 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
ae6ddcc5 1726 printk (KERN_ERR
1da177e4
LT		 1727 "EXT3-fs: Magic mismatch, very weird !\n");
1728 goto failed_mount;
1729 }
1730 }
1731
1732 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1733
1734 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1735 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1736 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1737 } else {
1738 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1739 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1740 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1741 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4
LT		 1742 (sbi->s_inode_size > blocksize)) {
1743 printk (KERN_ERR
1744 "EXT3-fs: unsupported inode size: %d\n",
1745 sbi->s_inode_size);
1746 goto failed_mount;
1747 }
1748 }
1749 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1750 le32_to_cpu(es->s_log_frag_size);
1751 if (blocksize != sbi->s_frag_size) {
1752 printk(KERN_ERR
1753 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1754 sbi->s_frag_size, blocksize);
1755 goto failed_mount;
1756 }
1757 sbi->s_frags_per_block = 1;
1758 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1759 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1760 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1761 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1762 goto cantfind_ext3;
1763 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1764 if (sbi->s_inodes_per_block == 0)
1765 goto cantfind_ext3;
1766 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1767 sbi->s_inodes_per_block;
1768 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1769 sbi->s_sbh = bh;
1770 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1771 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1772 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1773 for (i=0; i < 4; i++)
1774 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1775 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1776 i = le32_to_cpu(es->s_flags);
1777 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1778 sbi->s_hash_unsigned = 3;
1779 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1780#ifdef __CHAR_UNSIGNED__
1781 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1782 sbi->s_hash_unsigned = 3;
1783#else
1784 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1785#endif
1786 sb->s_dirt = 1;
1787 }
1da177e4
LT		 1788
1789 if (sbi->s_blocks_per_group > blocksize * 8) {
1790 printk (KERN_ERR
1791 "EXT3-fs: #blocks per group too big: %lu\n",
1792 sbi->s_blocks_per_group);
1793 goto failed_mount;
1794 }
1795 if (sbi->s_frags_per_group > blocksize * 8) {
1796 printk (KERN_ERR
1797 "EXT3-fs: #fragments per group too big: %lu\n",
1798 sbi->s_frags_per_group);
1799 goto failed_mount;
1800 }
1801 if (sbi->s_inodes_per_group > blocksize * 8) {
1802 printk (KERN_ERR
1803 "EXT3-fs: #inodes per group too big: %lu\n",
1804 sbi->s_inodes_per_group);
1805 goto failed_mount;
1806 }
1807
fcd5df35
MC		 1808 if (le32_to_cpu(es->s_blocks_count) >
1809 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1810 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1811 " too large to mount safely\n", sb->s_id);
1812 if (sizeof(sector_t) < 8)
1813 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1814 "enabled\n");
1815 goto failed_mount;
1816 }
1817
1da177e4
LT		 1818 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1819 goto cantfind_ext3;
855565e8
ES		 1820 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1821 le32_to_cpu(es->s_first_data_block) - 1)
1822 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1da177e4
LT		 1823 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1824 EXT3_DESC_PER_BLOCK(sb);
1825 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1826 GFP_KERNEL);
1827 if (sbi->s_group_desc == NULL) {
1828 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1829 goto failed_mount;
1830 }
1831
5df096d6 1832 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1833
1834 for (i = 0; i < db_count; i++) {
1835 block = descriptor_loc(sb, logic_sb_block, i);
1836 sbi->s_group_desc[i] = sb_bread(sb, block);
1837 if (!sbi->s_group_desc[i]) {
1838 printk (KERN_ERR "EXT3-fs: "
1839 "can't read group descriptor %d\n", i);
1840 db_count = i;
1841 goto failed_mount2;
1842 }
1843 }
1844 if (!ext3_check_descriptors (sb)) {
d2e5b13c 1845 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1da177e4
LT		 1846 goto failed_mount2;
1847 }
1848 sbi->s_gdb_count = db_count;
1849 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1850 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1851
833f4077
PZ		 1852 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1853 ext3_count_free_blocks(sb));
1854 if (!err) {
1855 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1856 ext3_count_free_inodes(sb));
1857 }
1858 if (!err) {
1859 err = percpu_counter_init(&sbi->s_dirs_counter,
1860 ext3_count_dirs(sb));
1861 }
1862 if (err) {
1863 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1864 goto failed_mount3;
1865 }
0216bfcf 1866
1da177e4
LT		 1867 /* per fileystem reservation list head & lock */
1868 spin_lock_init(&sbi->s_rsv_window_lock);
1869 sbi->s_rsv_window_root = RB_ROOT;
1870 /* Add a single, static dummy reservation to the start of the
1871 * reservation window list --- it gives us a placeholder for
1872 * append-at-start-of-list which makes the allocation logic
1873 * _much_ simpler. */
1874 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1875 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1876 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1877 sbi->s_rsv_window_head.rsv_goal_size = 0;
1878 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1879
1880 /*
1881 * set up enough so that it can read an inode
1882 */
1883 sb->s_op = &ext3_sops;
1884 sb->s_export_op = &ext3_export_ops;
1885 sb->s_xattr = ext3_xattr_handlers;
1886#ifdef CONFIG_QUOTA
1887 sb->s_qcop = &ext3_qctl_operations;
1888 sb->dq_op = &ext3_quota_operations;
1889#endif
1890 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1891
1892 sb->s_root = NULL;
1893
1894 needs_recovery = (es->s_last_orphan != 0 ||
1895 EXT3_HAS_INCOMPAT_FEATURE(sb,
1896 EXT3_FEATURE_INCOMPAT_RECOVER));
1897
1898 /*
1899 * The first inode we look at is the journal inode. Don't try
1900 * root first: it may be modified in the journal!
1901 */
1902 if (!test_opt(sb, NOLOAD) &&
1903 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1904 if (ext3_load_journal(sb, es, journal_devnum))
0216bfcf 1905 goto failed_mount3;
1da177e4
LT		 1906 } else if (journal_inum) {
1907 if (ext3_create_journal(sb, es, journal_inum))
0216bfcf 1908 goto failed_mount3;
1da177e4
LT		 1909 } else {
1910 if (!silent)
1911 printk (KERN_ERR
1912 "ext3: No journal on filesystem on %s\n",
1913 sb->s_id);
0216bfcf 1914 goto failed_mount3;
1da177e4
LT		 1915 }
1916
1917 /* We have now updated the journal if required, so we can
1918 * validate the data journaling mode. */
1919 switch (test_opt(sb, DATA_FLAGS)) {
1920 case 0:
1921 /* No mode set, assume a default based on the journal
1922 capabilities: ORDERED_DATA if the journal can
1923 cope, else JOURNAL_DATA */
1924 if (journal_check_available_features
1925 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1926 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1927 else
1928 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1929 break;
1930
1931 case EXT3_MOUNT_ORDERED_DATA:
1932 case EXT3_MOUNT_WRITEBACK_DATA:
1933 if (!journal_check_available_features
1934 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1935 printk(KERN_ERR "EXT3-fs: Journal does not support "
1936 "requested data journaling mode\n");
0216bfcf 1937 goto failed_mount4;
1da177e4
LT		 1938 }
1939 default:
1940 break;
1941 }
1942
1943 if (test_opt(sb, NOBH)) {
1da177e4
LT		 1944 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1945 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1946 "its supported only with writeback mode\n");
1947 clear_opt(sbi->s_mount_opt, NOBH);
1948 }
1949 }
1950 /*
1951 * The journal_load will have done any necessary log recovery,
1952 * so we can safely mount the rest of the filesystem now.
1953 */
1954
473043dc
DH		 1955 root = ext3_iget(sb, EXT3_ROOT_INO);
1956 if (IS_ERR(root)) {
1da177e4 1957 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
473043dc 1958 ret = PTR_ERR(root);
0216bfcf 1959 goto failed_mount4;
1da177e4
LT		 1960 }
1961 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 1962 iput(root);
1da177e4 1963 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
0216bfcf 1964 goto failed_mount4;
1da177e4 1965 }
473043dc
DH		 1966 sb->s_root = d_alloc_root(root);
1967 if (!sb->s_root) {
1968 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1969 iput(root);
1970 ret = -ENOMEM;
1971 goto failed_mount4;
1972 }
1da177e4
LT		 1973
1974 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1975 /*
1976 * akpm: core read_super() calls in here with the superblock locked.
1977 * That deadlocks, because orphan cleanup needs to lock the superblock
1978 * in numerous places. Here we just pop the lock - it's relatively
1979 * harmless, because we are now ready to accept write_super() requests,
1980 * and aviro says that's the only reason for hanging onto the
1981 * superblock lock.
1982 */
1983 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1984 ext3_orphan_cleanup(sb, es);
1985 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1986 if (needs_recovery)
1987 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1988 ext3_mark_recovery_complete(sb, es);
1989 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1990 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1991 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1992 "writeback");
1993
1da177e4
LT		 1994 lock_kernel();
1995 return 0;
1996
1997cantfind_ext3:
1998 if (!silent)
1999 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
2000 sb->s_id);
2001 goto failed_mount;
2002
0216bfcf 2003failed_mount4:
1da177e4 2004 journal_destroy(sbi->s_journal);
0216bfcf
MC		 2005failed_mount3:
2006 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2007 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2008 percpu_counter_destroy(&sbi->s_dirs_counter);
1da177e4
LT		 2009failed_mount2:
2010 for (i = 0; i < db_count; i++)
2011 brelse(sbi->s_group_desc[i]);
2012 kfree(sbi->s_group_desc);
2013failed_mount:
2014#ifdef CONFIG_QUOTA
2015 for (i = 0; i < MAXQUOTAS; i++)
2016 kfree(sbi->s_qf_names[i]);
2017#endif
2018 ext3_blkdev_remove(sbi);
2019 brelse(bh);
2020out_fail:
2021 sb->s_fs_info = NULL;
2022 kfree(sbi);
2023 lock_kernel();
473043dc 2024 return ret;
1da177e4
LT		 2025}
2026
2027/*
2028 * Setup any per-fs journal parameters now. We'll do this both on
2029 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2030 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2031 */
2032static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2033{
2034 struct ext3_sb_info *sbi = EXT3_SB(sb);
2035
2036 if (sbi->s_commit_interval)
2037 journal->j_commit_interval = sbi->s_commit_interval;
2038 /* We could also set up an ext3-specific default for the commit
2039 * interval here, but for now we'll just fall back to the jbd
2040 * default. */
2041
2042 spin_lock(&journal->j_state_lock);
2043 if (test_opt(sb, BARRIER))
2044 journal->j_flags |= JFS_BARRIER;
2045 else
2046 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2047 if (test_opt(sb, DATA_ERR_ABORT))
2048 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2049 else
2050 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2051 spin_unlock(&journal->j_state_lock);
2052}
2053
eee194e7
ES		 2054static journal_t *ext3_get_journal(struct super_block *sb,
2055 unsigned int journal_inum)
1da177e4
LT		 2056{
2057 struct inode *journal_inode;
2058 journal_t *journal;
2059
2060 /* First, test for the existence of a valid inode on disk. Bad
2061 * things happen if we iget() an unused inode, as the subsequent
2062 * iput() will try to delete it. */
2063
473043dc
DH		 2064 journal_inode = ext3_iget(sb, journal_inum);
2065 if (IS_ERR(journal_inode)) {
1da177e4
LT		 2066 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2067 return NULL;
2068 }
2069 if (!journal_inode->i_nlink) {
2070 make_bad_inode(journal_inode);
2071 iput(journal_inode);
2072 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2073 return NULL;
2074 }
2075
2076 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2077 journal_inode, journal_inode->i_size);
473043dc 2078 if (!S_ISREG(journal_inode->i_mode)) {
1da177e4
LT		 2079 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2080 iput(journal_inode);
2081 return NULL;
2082 }
2083
2084 journal = journal_init_inode(journal_inode);
2085 if (!journal) {
2086 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2087 iput(journal_inode);
2088 return NULL;
2089 }
2090 journal->j_private = sb;
2091 ext3_init_journal_params(sb, journal);
2092 return journal;
2093}
2094
2095static journal_t *ext3_get_dev_journal(struct super_block *sb,
2096 dev_t j_dev)
2097{
2098 struct buffer_head * bh;
2099 journal_t *journal;
43d23f90 2100 ext3_fsblk_t start;
1c2bf374 2101 ext3_fsblk_t len;
1da177e4 2102 int hblock, blocksize;
43d23f90 2103 ext3_fsblk_t sb_block;
1da177e4
LT		 2104 unsigned long offset;
2105 struct ext3_super_block * es;
2106 struct block_device *bdev;
2107
2108 bdev = ext3_blkdev_get(j_dev);
2109 if (bdev == NULL)
2110 return NULL;
2111
2112 if (bd_claim(bdev, sb)) {
2113 printk(KERN_ERR
2114 "EXT3: failed to claim external journal device.\n");
9a1c3542 2115 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 2116 return NULL;
2117 }
2118
2119 blocksize = sb->s_blocksize;
2120 hblock = bdev_hardsect_size(bdev);
2121 if (blocksize < hblock) {
2122 printk(KERN_ERR
2123 "EXT3-fs: blocksize too small for journal device.\n");
2124 goto out_bdev;
2125 }
2126
2127 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2128 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2129 set_blocksize(bdev, blocksize);
2130 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2131 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2132 "external journal\n");
2133 goto out_bdev;
2134 }
2135
2136 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2137 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2138 !(le32_to_cpu(es->s_feature_incompat) &
2139 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2140 printk(KERN_ERR "EXT3-fs: external journal has "
2141 "bad superblock\n");
2142 brelse(bh);
2143 goto out_bdev;
2144 }
2145
2146 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2147 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2148 brelse(bh);
2149 goto out_bdev;
2150 }
2151
2152 len = le32_to_cpu(es->s_blocks_count);
2153 start = sb_block + 1;
2154 brelse(bh); /* we're done with the superblock */
2155
2156 journal = journal_init_dev(bdev, sb->s_bdev,
2157 start, len, blocksize);
2158 if (!journal) {
2159 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2160 goto out_bdev;
2161 }
2162 journal->j_private = sb;
2163 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2164 wait_on_buffer(journal->j_sb_buffer);
2165 if (!buffer_uptodate(journal->j_sb_buffer)) {
2166 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2167 goto out_journal;
2168 }
2169 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2170 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2171 "user (unsupported) - %d\n",
2172 be32_to_cpu(journal->j_superblock->s_nr_users));
2173 goto out_journal;
2174 }
2175 EXT3_SB(sb)->journal_bdev = bdev;
2176 ext3_init_journal_params(sb, journal);
2177 return journal;
2178out_journal:
2179 journal_destroy(journal);
2180out_bdev:
2181 ext3_blkdev_put(bdev);
2182 return NULL;
2183}
2184
71b96257
JL		 2185static int ext3_load_journal(struct super_block *sb,
2186 struct ext3_super_block *es,
2187 unsigned long journal_devnum)
1da177e4
LT		 2188{
2189 journal_t *journal;
eee194e7 2190 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2191 dev_t journal_dev;
1da177e4
LT		 2192 int err = 0;
2193 int really_read_only;
2194
71b96257
JL		 2195 if (journal_devnum &&
2196 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2197 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2198 "numbers have changed\n");
2199 journal_dev = new_decode_dev(journal_devnum);
2200 } else
2201 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2202
1da177e4
LT		 2203 really_read_only = bdev_read_only(sb->s_bdev);
2204
2205 /*
2206 * Are we loading a blank journal or performing recovery after a
2207 * crash? For recovery, we need to check in advance whether we
2208 * can get read-write access to the device.
2209 */
2210
2211 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2212 if (sb->s_flags & MS_RDONLY) {
2213 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2214 "required on readonly filesystem.\n");
2215 if (really_read_only) {
2216 printk(KERN_ERR "EXT3-fs: write access "
2217 "unavailable, cannot proceed.\n");
2218 return -EROFS;
2219 }
2220 printk (KERN_INFO "EXT3-fs: write access will "
2221 "be enabled during recovery.\n");
2222 }
2223 }
2224
2225 if (journal_inum && journal_dev) {
2226 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2227 "and inode journals!\n");
2228 return -EINVAL;
2229 }
2230
2231 if (journal_inum) {
2232 if (!(journal = ext3_get_journal(sb, journal_inum)))
2233 return -EINVAL;
2234 } else {
2235 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2236 return -EINVAL;
2237 }
2238
2239 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2240 err = journal_update_format(journal);
2241 if (err) {
2242 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2243 journal_destroy(journal);
2244 return err;
2245 }
2246 }
2247
2248 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2249 err = journal_wipe(journal, !really_read_only);
2250 if (!err)
2251 err = journal_load(journal);
2252
2253 if (err) {
2254 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2255 journal_destroy(journal);
2256 return err;
2257 }
2258
2259 EXT3_SB(sb)->s_journal = journal;
2260 ext3_clear_journal_err(sb, es);
71b96257
JL		 2261
2262 if (journal_devnum &&
2263 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2264 es->s_journal_dev = cpu_to_le32(journal_devnum);
2265 sb->s_dirt = 1;
2266
2267 /* Make sure we flush the recovery flag to disk. */
2268 ext3_commit_super(sb, es, 1);
2269 }
2270
1da177e4
LT		 2271 return 0;
2272}
2273
2274static int ext3_create_journal(struct super_block * sb,
2275 struct ext3_super_block * es,
eee194e7 2276 unsigned int journal_inum)
1da177e4
LT		 2277{
2278 journal_t *journal;
952d9de1 2279 int err;
1da177e4
LT		 2280
2281 if (sb->s_flags & MS_RDONLY) {
2282 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2283 "create journal.\n");
2284 return -EROFS;
2285 }
2286
952d9de1
BP		 2287 journal = ext3_get_journal(sb, journal_inum);
2288 if (!journal)
1da177e4
LT		 2289 return -EINVAL;
2290
eee194e7 2291 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
1da177e4
LT		 2292 journal_inum);
2293
952d9de1
BP		 2294 err = journal_create(journal);
2295 if (err) {
1da177e4
LT		 2296 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2297 journal_destroy(journal);
2298 return -EIO;
2299 }
2300
2301 EXT3_SB(sb)->s_journal = journal;
2302
2303 ext3_update_dynamic_rev(sb);
2304 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2305 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2306
2307 es->s_journal_inum = cpu_to_le32(journal_inum);
2308 sb->s_dirt = 1;
2309
2310 /* Make sure we flush the recovery flag to disk. */
2311 ext3_commit_super(sb, es, 1);
2312
2313 return 0;
2314}
2315
c4be0c1d
TS		 2316static int ext3_commit_super(struct super_block *sb,
2317 struct ext3_super_block *es,
1da177e4
LT		 2318 int sync)
2319{
2320 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
c4be0c1d 2321 int error = 0;
1da177e4
LT		 2322
2323 if (!sbh)
c4be0c1d 2324 return error;
1da177e4
LT		 2325 es->s_wtime = cpu_to_le32(get_seconds());
2326 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2327 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2328 BUFFER_TRACE(sbh, "marking dirty");
2329 mark_buffer_dirty(sbh);
2330 if (sync)
c4be0c1d
TS		 2331 error = sync_dirty_buffer(sbh);
2332 return error;
1da177e4
LT		 2333}
2334
2335
2336/*
2337 * Have we just finished recovery? If so, and if we are mounting (or
2338 * remounting) the filesystem readonly, then we will end up with a
2339 * consistent fs on disk. Record that fact.
2340 */
2341static void ext3_mark_recovery_complete(struct super_block * sb,
2342 struct ext3_super_block * es)
2343{
2344 journal_t *journal = EXT3_SB(sb)->s_journal;
2345
2346 journal_lock_updates(journal);
2d7c820e
HK		 2347 if (journal_flush(journal) < 0)
2348 goto out;
2349
030703e4 2350 lock_super(sb);
1da177e4
LT		 2351 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2352 sb->s_flags & MS_RDONLY) {
2353 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2354 sb->s_dirt = 0;
2355 ext3_commit_super(sb, es, 1);
2356 }
030703e4 2357 unlock_super(sb);
2d7c820e
HK		 2358
2359out:
1da177e4
LT		 2360 journal_unlock_updates(journal);
2361}
2362
2363/*
2364 * If we are mounting (or read-write remounting) a filesystem whose journal
2365 * has recorded an error from a previous lifetime, move that error to the
2366 * main filesystem now.
2367 */
2368static void ext3_clear_journal_err(struct super_block * sb,
2369 struct ext3_super_block * es)
2370{
2371 journal_t *journal;
2372 int j_errno;
2373 const char *errstr;
2374
2375 journal = EXT3_SB(sb)->s_journal;
2376
2377 /*
2378 * Now check for any error status which may have been recorded in the
2379 * journal by a prior ext3_error() or ext3_abort()
2380 */
2381
2382 j_errno = journal_errno(journal);
2383 if (j_errno) {
2384 char nbuf[16];
2385
2386 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2387 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2388 "from previous mount: %s", errstr);
e05b6b52 2389 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2390 "filesystem check.");
2391
2392 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2393 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2394 ext3_commit_super (sb, es, 1);
2395
2396 journal_clear_err(journal);
2397 }
2398}
2399
2400/*
2401 * Force the running and committing transactions to commit,
2402 * and wait on the commit.
2403 */
2404int ext3_force_commit(struct super_block *sb)
2405{
2406 journal_t *journal;
2407 int ret;
2408
2409 if (sb->s_flags & MS_RDONLY)
2410 return 0;
2411
2412 journal = EXT3_SB(sb)->s_journal;
2413 sb->s_dirt = 0;
2414 ret = ext3_journal_force_commit(journal);
2415 return ret;
2416}
2417
2418/*
2419 * Ext3 always journals updates to the superblock itself, so we don't
2420 * have to propagate any other updates to the superblock on disk at this
6cdfcc27
TT		 2421 * point. (We can probably nuke this function altogether, and remove
2422 * any mention to sb->s_dirt in all of fs/ext3; eventual cleanup...)
1da177e4 2423 */
1da177e4
LT		 2424static void ext3_write_super (struct super_block * sb)
2425{
7892f2f4 2426 if (mutex_trylock(&sb->s_lock) != 0)
1da177e4
LT		 2427 BUG();
2428 sb->s_dirt = 0;
2429}
2430
2431static int ext3_sync_fs(struct super_block *sb, int wait)
2432{
02ac597c 2433 tid_t target;
c87591b7 2434
02ac597c
JK		 2435 sb->s_dirt = 0;
2436 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2437 if (wait)
2438 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2439 }
1da177e4
LT		 2440 return 0;
2441}
2442
2443/*
2444 * LVM calls this function before a (read-only) snapshot is created. This
2445 * gives us a chance to flush the journal completely and mark the fs clean.
2446 */
c4be0c1d 2447static int ext3_freeze(struct super_block *sb)
1da177e4 2448{
c4be0c1d
TS		 2449 int error = 0;
2450 journal_t *journal;
1da177e4
LT		 2451 sb->s_dirt = 0;
2452
2453 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2454 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2455
2456 /* Now we set up the journal barrier. */
2457 journal_lock_updates(journal);
2d7c820e
HK		 2458
2459 /*
2460 * We don't want to clear needs_recovery flag when we failed
2461 * to flush the journal.
2462 */
c4be0c1d
TS		 2463 error = journal_flush(journal);
2464 if (error < 0)
2465 goto out;
1da177e4
LT		 2466
2467 /* Journal blocked and flushed, clear needs_recovery flag. */
2468 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2469 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2470 if (error)
2471 goto out;
1da177e4 2472 }
c4be0c1d
TS		 2473 return 0;
2474
2475out:
2476 journal_unlock_updates(journal);
2477 return error;
1da177e4
LT		 2478}
2479
2480/*
2481 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2482 * flag here, even though the filesystem is not technically dirty yet.
2483 */
c4be0c1d 2484static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2485{
2486 if (!(sb->s_flags & MS_RDONLY)) {
2487 lock_super(sb);
2488 /* Reser the needs_recovery flag before the fs is unlocked. */
2489 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2490 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2491 unlock_super(sb);
2492 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2493 }
c4be0c1d 2494 return 0;
1da177e4
LT		 2495}
2496
2497static int ext3_remount (struct super_block * sb, int * flags, char * data)
2498{
2499 struct ext3_super_block * es;
2500 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2501 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2502 unsigned long old_sb_flags;
2503 struct ext3_mount_options old_opts;
2504 int err;
2505#ifdef CONFIG_QUOTA
2506 int i;
2507#endif
2508
2509 /* Store the original options */
2510 old_sb_flags = sb->s_flags;
2511 old_opts.s_mount_opt = sbi->s_mount_opt;
2512 old_opts.s_resuid = sbi->s_resuid;
2513 old_opts.s_resgid = sbi->s_resgid;
2514 old_opts.s_commit_interval = sbi->s_commit_interval;
2515#ifdef CONFIG_QUOTA
2516 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2517 for (i = 0; i < MAXQUOTAS; i++)
2518 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2519#endif
1da177e4
LT		 2520
2521 /*
2522 * Allow the "check" option to be passed as a remount option.
2523 */
71b96257 2524 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2525 err = -EINVAL;
2526 goto restore_opts;
2527 }
1da177e4
LT		 2528
2529 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
e05b6b52 2530 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2531
2532 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2533 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2534
2535 es = sbi->s_es;
2536
2537 ext3_init_journal_params(sb, sbi->s_journal);
2538
2539 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2540 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
08c6a96f
JK		 2541 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2542 err = -EROFS;
2543 goto restore_opts;
2544 }
1da177e4
LT		 2545
2546 if (*flags & MS_RDONLY) {
2547 /*
2548 * First of all, the unconditional stuff we have to do
2549 * to disable replay of the journal when we next remount
2550 */
2551 sb->s_flags |= MS_RDONLY;
2552
2553 /*
2554 * OK, test if we are remounting a valid rw partition
2555 * readonly, and if so set the rdonly flag and then
2556 * mark the partition as valid again.
2557 */
2558 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2559 (sbi->s_mount_state & EXT3_VALID_FS))
2560 es->s_state = cpu_to_le16(sbi->s_mount_state);
2561
030703e4
JK		 2562 /*
2563 * We have to unlock super so that we can wait for
2564 * transactions.
2565 */
2566 unlock_super(sb);
1da177e4 2567 ext3_mark_recovery_complete(sb, es);
030703e4 2568 lock_super(sb);
1da177e4
LT		 2569 } else {
2570 __le32 ret;
2571 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2572 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2573 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2574 "remount RDWR because of unsupported "
2575 "optional features (%x).\n",
2576 sb->s_id, le32_to_cpu(ret));
08c6a96f
JK		 2577 err = -EROFS;
2578 goto restore_opts;
1da177e4 2579 }
ea9a05a1
ES		 2580
2581 /*
2582 * If we have an unprocessed orphan list hanging
2583 * around from a previously readonly bdev mount,
2584 * require a full umount/remount for now.
2585 */
2586 if (es->s_last_orphan) {
2587 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2588 "remount RDWR because of unprocessed "
2589 "orphan inode list. Please "
2590 "umount/remount instead.\n",
2591 sb->s_id);
2592 err = -EINVAL;
2593 goto restore_opts;
2594 }
2595
1da177e4
LT		 2596 /*
2597 * Mounting a RDONLY partition read-write, so reread
2598 * and store the current valid flag. (It may have
2599 * been changed by e2fsck since we originally mounted
2600 * the partition.)
2601 */
2602 ext3_clear_journal_err(sb, es);
2603 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2604 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2605 goto restore_opts;
1da177e4
LT		 2606 if (!ext3_setup_super (sb, es, 0))
2607 sb->s_flags &= ~MS_RDONLY;
2608 }
2609 }
08c6a96f
JK		 2610#ifdef CONFIG_QUOTA
2611 /* Release old quota file names */
2612 for (i = 0; i < MAXQUOTAS; i++)
2613 if (old_opts.s_qf_names[i] &&
2614 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2615 kfree(old_opts.s_qf_names[i]);
2616#endif
1da177e4 2617 return 0;
08c6a96f
JK		 2618restore_opts:
2619 sb->s_flags = old_sb_flags;
2620 sbi->s_mount_opt = old_opts.s_mount_opt;
2621 sbi->s_resuid = old_opts.s_resuid;
2622 sbi->s_resgid = old_opts.s_resgid;
2623 sbi->s_commit_interval = old_opts.s_commit_interval;
2624#ifdef CONFIG_QUOTA
2625 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2626 for (i = 0; i < MAXQUOTAS; i++) {
2627 if (sbi->s_qf_names[i] &&
2628 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2629 kfree(sbi->s_qf_names[i]);
2630 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2631 }
2632#endif
2633 return err;
1da177e4
LT		 2634}
2635
726c3342 2636static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2637{
726c3342 2638 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2639 struct ext3_sb_info *sbi = EXT3_SB(sb);
2640 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2641 u64 fsid;
1da177e4 2642
a71ce8c6
BP		 2643 if (test_opt(sb, MINIX_DF)) {
2644 sbi->s_overhead_last = 0;
2645 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2646 unsigned long ngroups = sbi->s_groups_count, i;
2647 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2648 smp_rmb();
2649
2650 /*
a71ce8c6
BP		 2651 * Compute the overhead (FS structures). This is constant
2652 * for a given filesystem unless the number of block groups
2653 * changes so we cache the previous value until it does.
1da177e4
LT		 2654 */
2655
2656 /*
2657 * All of the blocks before first_data_block are
2658 * overhead
2659 */
2660 overhead = le32_to_cpu(es->s_first_data_block);
2661
2662 /*
2663 * Add the overhead attributed to the superblock and
2664 * block group descriptors. If the sparse superblocks
2665 * feature is turned on, then not all groups have this.
2666 */
2667 for (i = 0; i < ngroups; i++) {
2668 overhead += ext3_bg_has_super(sb, i) +
2669 ext3_bg_num_gdb(sb, i);
2670 cond_resched();
2671 }
2672
2673 /*
2674 * Every block group has an inode bitmap, a block
2675 * bitmap, and an inode table.
2676 */
a71ce8c6
BP		 2677 overhead += ngroups * (2 + sbi->s_itb_per_group);
2678 sbi->s_overhead_last = overhead;
2679 smp_wmb();
2680 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2681 }
2682
2683 buf->f_type = EXT3_SUPER_MAGIC;
2684 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2685 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2686 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
a71ce8c6 2687 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1da177e4
LT		 2688 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2689 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2690 buf->f_bavail = 0;
2691 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2692 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
a71ce8c6 2693 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1da177e4 2694 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2695 fsid = le64_to_cpup((void *)es->s_uuid) ^
2696 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2697 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2698 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2699 return 0;
2700}
2701
2702/* Helper function for writing quotas on sync - we need to start transaction before quota file
2703 * is locked for write. Otherwise the are possible deadlocks:
2704 * Process 1 Process 2
2705 * ext3_create() quota_sync()
2706 * journal_start() write_dquot()
d3be915f
IM		 2707 * DQUOT_INIT() down(dqio_mutex)
2708 * down(dqio_mutex) journal_start()
1da177e4
LT		 2709 *
2710 */
2711
2712#ifdef CONFIG_QUOTA
2713
2714static inline struct inode *dquot_to_inode(struct dquot *dquot)
2715{
2716 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2717}
2718
2719static int ext3_dquot_initialize(struct inode *inode, int type)
2720{
2721 handle_t *handle;
2722 int ret, err;
2723
2724 /* We may create quota structure so we need to reserve enough blocks */
1f54587b 2725 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
1da177e4
LT		 2726 if (IS_ERR(handle))
2727 return PTR_ERR(handle);
2728 ret = dquot_initialize(inode, type);
2729 err = ext3_journal_stop(handle);
2730 if (!ret)
2731 ret = err;
2732 return ret;
2733}
2734
2735static int ext3_dquot_drop(struct inode *inode)
2736{
2737 handle_t *handle;
2738 int ret, err;
2739
2740 /* We may delete quota structure so we need to reserve enough blocks */
1f54587b 2741 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
07c9938a
JK		 2742 if (IS_ERR(handle)) {
2743 /*
2744 * We call dquot_drop() anyway to at least release references
2745 * to quota structures so that umount does not hang.
2746 */
2747 dquot_drop(inode);
1da177e4 2748 return PTR_ERR(handle);
07c9938a 2749 }
1da177e4
LT		 2750 ret = dquot_drop(inode);
2751 err = ext3_journal_stop(handle);
2752 if (!ret)
2753 ret = err;
2754 return ret;
2755}
2756
2757static int ext3_write_dquot(struct dquot *dquot)
2758{
2759 int ret, err;
2760 handle_t *handle;
2761 struct inode *inode;
2762
2763 inode = dquot_to_inode(dquot);
2764 handle = ext3_journal_start(inode,
1f54587b 2765 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2766 if (IS_ERR(handle))
2767 return PTR_ERR(handle);
2768 ret = dquot_commit(dquot);
2769 err = ext3_journal_stop(handle);
2770 if (!ret)
2771 ret = err;
2772 return ret;
2773}
2774
2775static int ext3_acquire_dquot(struct dquot *dquot)
2776{
2777 int ret, err;
2778 handle_t *handle;
2779
2780 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2781 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2782 if (IS_ERR(handle))
2783 return PTR_ERR(handle);
2784 ret = dquot_acquire(dquot);
2785 err = ext3_journal_stop(handle);
2786 if (!ret)
2787 ret = err;
2788 return ret;
2789}
2790
2791static int ext3_release_dquot(struct dquot *dquot)
2792{
2793 int ret, err;
2794 handle_t *handle;
2795
2796 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2797 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2798 if (IS_ERR(handle)) {
2799 /* Release dquot anyway to avoid endless cycle in dqput() */
2800 dquot_release(dquot);
1da177e4 2801 return PTR_ERR(handle);
9c3013e9 2802 }
1da177e4
LT		 2803 ret = dquot_release(dquot);
2804 err = ext3_journal_stop(handle);
2805 if (!ret)
2806 ret = err;
2807 return ret;
2808}
2809
2810static int ext3_mark_dquot_dirty(struct dquot *dquot)
2811{
99aeaf63 2812 /* Are we journaling quotas? */
1da177e4
LT		 2813 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2814 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2815 dquot_mark_dquot_dirty(dquot);
2816 return ext3_write_dquot(dquot);
2817 } else {
2818 return dquot_mark_dquot_dirty(dquot);
2819 }
2820}
2821
2822static int ext3_write_info(struct super_block *sb, int type)
2823{
2824 int ret, err;
2825 handle_t *handle;
2826
2827 /* Data block + inode block */
2828 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2829 if (IS_ERR(handle))
2830 return PTR_ERR(handle);
2831 ret = dquot_commit_info(sb, type);
2832 err = ext3_journal_stop(handle);
2833 if (!ret)
2834 ret = err;
2835 return ret;
2836}
2837
2838/*
2839 * Turn on quotas during mount time - we need to find
2840 * the quota file and such...
2841 */
2842static int ext3_quota_on_mount(struct super_block *sb, int type)
2843{
84de856e
CH		 2844 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2845 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2846}
2847
2848/*
2849 * Standard function to be called on quota_on
2850 */
2851static int ext3_quota_on(struct super_block *sb, int type, int format_id,
8264613d 2852 char *name, int remount)
1da177e4
LT		 2853{
2854 int err;
8264613d 2855 struct path path;
1da177e4 2856
1f54587b
JK		 2857 if (!test_opt(sb, QUOTA))
2858 return -EINVAL;
8264613d 2859 /* When remounting, no checks are needed and in fact, name is NULL */
9cfe7b90 2860 if (remount)
8264613d 2861 return vfs_quota_on(sb, type, format_id, name, remount);
9cfe7b90 2862
8264613d 2863 err = kern_path(name, LOOKUP_FOLLOW, &path);
1da177e4
LT		 2864 if (err)
2865 return err;
9cfe7b90 2866
1da177e4 2867 /* Quotafile not on the same filesystem? */
8264613d
AV		 2868 if (path.mnt->mnt_sb != sb) {
2869 path_put(&path);
1da177e4
LT		 2870 return -EXDEV;
2871 }
9cfe7b90
JK		 2872 /* Journaling quota? */
2873 if (EXT3_SB(sb)->s_qf_names[type]) {
2874 /* Quotafile not of fs root? */
8264613d 2875 if (path.dentry->d_parent != sb->s_root)
9cfe7b90
JK		 2876 printk(KERN_WARNING
2877 "EXT3-fs: Quota file not on filesystem root. "
2878 "Journaled quota will not work.\n");
2879 }
2880
2881 /*
2882 * When we journal data on quota file, we have to flush journal to see
2883 * all updates to the file when we bypass pagecache...
2884 */
8264613d 2885 if (ext3_should_journal_data(path.dentry->d_inode)) {
9cfe7b90
JK		 2886 /*
2887 * We don't need to lock updates but journal_flush() could
2888 * otherwise be livelocked...
2889 */
2890 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2891 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2892 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2893 if (err) {
12e1ec9f 2894 path_put(&path);
2d7c820e
HK		 2895 return err;
2896 }
9cfe7b90
JK		 2897 }
2898
8264613d
AV		 2899 err = vfs_quota_on_path(sb, type, format_id, &path);
2900 path_put(&path);
77e69dac 2901 return err;
1da177e4
LT		 2902}
2903
2904/* Read data from quotafile - avoid pagecache and such because we cannot afford
2905 * acquiring the locks... As quota files are never truncated and quota code
2906 * itself serializes the operations (and noone else should touch the files)
2907 * we don't have to be afraid of races */
2908static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2909 size_t len, loff_t off)
2910{
2911 struct inode *inode = sb_dqopt(sb)->files[type];
2912 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2913 int err = 0;
2914 int offset = off & (sb->s_blocksize - 1);
2915 int tocopy;
2916 size_t toread;
2917 struct buffer_head *bh;
2918 loff_t i_size = i_size_read(inode);
2919
2920 if (off > i_size)
2921 return 0;
2922 if (off+len > i_size)
2923 len = i_size-off;
2924 toread = len;
2925 while (toread > 0) {
2926 tocopy = sb->s_blocksize - offset < toread ?
2927 sb->s_blocksize - offset : toread;
2928 bh = ext3_bread(NULL, inode, blk, 0, &err);
2929 if (err)
2930 return err;
2931 if (!bh) /* A hole? */
2932 memset(data, 0, tocopy);
2933 else
2934 memcpy(data, bh->b_data+offset, tocopy);
2935 brelse(bh);
2936 offset = 0;
2937 toread -= tocopy;
2938 data += tocopy;
2939 blk++;
2940 }
2941 return len;
2942}
2943
2944/* Write to quotafile (we know the transaction is already started and has
2945 * enough credits) */
2946static ssize_t ext3_quota_write(struct super_block *sb, int type,
2947 const char *data, size_t len, loff_t off)
2948{
2949 struct inode *inode = sb_dqopt(sb)->files[type];
2950 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2951 int err = 0;
2952 int offset = off & (sb->s_blocksize - 1);
2953 int tocopy;
2954 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2955 size_t towrite = len;
2956 struct buffer_head *bh;
2957 handle_t *handle = journal_current_handle();
2958
9c3013e9
JK		 2959 if (!handle) {
2960 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2961 " cancelled because transaction is not started.\n",
2962 (unsigned long long)off, (unsigned long long)len);
2963 return -EIO;
2964 }
5c81a419 2965 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1da177e4
LT		 2966 while (towrite > 0) {
2967 tocopy = sb->s_blocksize - offset < towrite ?
2968 sb->s_blocksize - offset : towrite;
2969 bh = ext3_bread(handle, inode, blk, 1, &err);
2970 if (!bh)
2971 goto out;
2972 if (journal_quota) {
2973 err = ext3_journal_get_write_access(handle, bh);
2974 if (err) {
2975 brelse(bh);
2976 goto out;
2977 }
2978 }
2979 lock_buffer(bh);
2980 memcpy(bh->b_data+offset, data, tocopy);
2981 flush_dcache_page(bh->b_page);
2982 unlock_buffer(bh);
2983 if (journal_quota)
2984 err = ext3_journal_dirty_metadata(handle, bh);
2985 else {
2986 /* Always do at least ordered writes for quotas */
2987 err = ext3_journal_dirty_data(handle, bh);
2988 mark_buffer_dirty(bh);
2989 }
2990 brelse(bh);
2991 if (err)
2992 goto out;
2993 offset = 0;
2994 towrite -= tocopy;
2995 data += tocopy;
2996 blk++;
2997 }
2998out:
f5c8f7da
JK		 2999 if (len == towrite) {
3000 mutex_unlock(&inode->i_mutex);
1da177e4 3001 return err;
f5c8f7da 3002 }
1da177e4
LT		 3003 if (inode->i_size < off+len-towrite) {
3004 i_size_write(inode, off+len-towrite);
3005 EXT3_I(inode)->i_disksize = inode->i_size;
3006 }
3007 inode->i_version++;
3008 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3009 ext3_mark_inode_dirty(handle, inode);
1b1dcc1b 3010 mutex_unlock(&inode->i_mutex);
1da177e4
LT		 3011 return len - towrite;
3012}
3013
3014#endif
3015
454e2398
DH		 3016static int ext3_get_sb(struct file_system_type *fs_type,
3017 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 3018{
454e2398 3019 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
1da177e4
LT		 3020}
3021
3022static struct file_system_type ext3_fs_type = {
3023 .owner = THIS_MODULE,
3024 .name = "ext3",
3025 .get_sb = ext3_get_sb,
3026 .kill_sb = kill_block_super,
3027 .fs_flags = FS_REQUIRES_DEV,
3028};
3029
3030static int __init init_ext3_fs(void)
3031{
3032 int err = init_ext3_xattr();
3033 if (err)
3034 return err;
3035 err = init_inodecache();
3036 if (err)
3037 goto out1;
3038 err = register_filesystem(&ext3_fs_type);
3039 if (err)
3040 goto out;
3041 return 0;
3042out:
3043 destroy_inodecache();
3044out1:
e9ad5620 3045 exit_ext3_xattr();
1da177e4
LT		 3046 return err;
3047}
3048
3049static void __exit exit_ext3_fs(void)
3050{
3051 unregister_filesystem(&ext3_fs_type);
3052 destroy_inodecache();
3053 exit_ext3_xattr();
3054}
3055
3056MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3057MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3058MODULE_LICENSE("GPL");
3059module_init(init_ext3_fs)
3060module_exit(exit_ext3_fs)
Linux 6.x block layer and io_uring tree(s)