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Merge branch 'v28-range-hrtimers-for-linus-v2' of git://git.kernel.org/pub/scm/linux...
[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);
1da177e4
LT		 51static void ext3_commit_super (struct super_block * sb,
52 struct ext3_super_block * es,
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);
1da177e4
LT		 63static void ext3_unlockfs(struct super_block *sb);
64static void ext3_write_super (struct super_block * sb);
65static void ext3_write_super_lockfs(struct super_block *sb);
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;
284 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
285}
286
287void ext3_warning (struct super_block * sb, const char * function,
288 const char * fmt, ...)
289{
290 va_list args;
291
292 va_start(args, fmt);
293 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
294 sb->s_id, function);
295 vprintk(fmt, args);
296 printk("\n");
297 va_end(args);
298}
299
300void ext3_update_dynamic_rev(struct super_block *sb)
301{
302 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
303
304 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
305 return;
306
e05b6b52 307 ext3_warning(sb, __func__,
1da177e4
LT		 308 "updating to rev %d because of new feature flag, "
309 "running e2fsck is recommended",
310 EXT3_DYNAMIC_REV);
311
312 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
313 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
314 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
315 /* leave es->s_feature_*compat flags alone */
316 /* es->s_uuid will be set by e2fsck if empty */
317
318 /*
319 * The rest of the superblock fields should be zero, and if not it
320 * means they are likely already in use, so leave them alone. We
321 * can leave it up to e2fsck to clean up any inconsistencies there.
322 */
323}
324
325/*
326 * Open the external journal device
327 */
328static struct block_device *ext3_blkdev_get(dev_t dev)
329{
330 struct block_device *bdev;
331 char b[BDEVNAME_SIZE];
332
333 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
334 if (IS_ERR(bdev))
335 goto fail;
336 return bdev;
337
338fail:
339 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
340 __bdevname(dev, b), PTR_ERR(bdev));
341 return NULL;
342}
343
344/*
345 * Release the journal device
346 */
347static int ext3_blkdev_put(struct block_device *bdev)
348{
349 bd_release(bdev);
9a1c3542 350 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 351}
352
353static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
354{
355 struct block_device *bdev;
356 int ret = -ENODEV;
357
358 bdev = sbi->journal_bdev;
359 if (bdev) {
360 ret = ext3_blkdev_put(bdev);
361 sbi->journal_bdev = NULL;
362 }
363 return ret;
364}
365
366static inline struct inode *orphan_list_entry(struct list_head *l)
367{
368 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
369}
370
371static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
372{
373 struct list_head *l;
374
ae6ddcc5 375 printk(KERN_ERR "sb orphan head is %d\n",
1da177e4
LT		 376 le32_to_cpu(sbi->s_es->s_last_orphan));
377
378 printk(KERN_ERR "sb_info orphan list:\n");
379 list_for_each(l, &sbi->s_orphan) {
380 struct inode *inode = orphan_list_entry(l);
381 printk(KERN_ERR " "
eee194e7 382 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 383 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 384 inode->i_mode, inode->i_nlink,
1da177e4
LT		 385 NEXT_ORPHAN(inode));
386 }
387}
388
389static void ext3_put_super (struct super_block * sb)
390{
391 struct ext3_sb_info *sbi = EXT3_SB(sb);
392 struct ext3_super_block *es = sbi->s_es;
393 int i;
394
395 ext3_xattr_put_super(sb);
2d7c820e
HK		 396 if (journal_destroy(sbi->s_journal) < 0)
397 ext3_abort(sb, __func__, "Couldn't clean up the journal");
1da177e4
LT		 398 if (!(sb->s_flags & MS_RDONLY)) {
399 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
400 es->s_state = cpu_to_le16(sbi->s_mount_state);
401 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
402 mark_buffer_dirty(sbi->s_sbh);
403 ext3_commit_super(sb, es, 1);
404 }
405
406 for (i = 0; i < sbi->s_gdb_count; i++)
407 brelse(sbi->s_group_desc[i]);
408 kfree(sbi->s_group_desc);
409 percpu_counter_destroy(&sbi->s_freeblocks_counter);
410 percpu_counter_destroy(&sbi->s_freeinodes_counter);
411 percpu_counter_destroy(&sbi->s_dirs_counter);
412 brelse(sbi->s_sbh);
413#ifdef CONFIG_QUOTA
414 for (i = 0; i < MAXQUOTAS; i++)
415 kfree(sbi->s_qf_names[i]);
416#endif
417
418 /* Debugging code just in case the in-memory inode orphan list
419 * isn't empty. The on-disk one can be non-empty if we've
420 * detected an error and taken the fs readonly, but the
421 * in-memory list had better be clean by this point. */
422 if (!list_empty(&sbi->s_orphan))
423 dump_orphan_list(sb, sbi);
424 J_ASSERT(list_empty(&sbi->s_orphan));
425
f98393a6 426 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 427 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
428 /*
429 * Invalidate the journal device's buffers. We don't want them
430 * floating about in memory - the physical journal device may
431 * hotswapped, and it breaks the `ro-after' testing code.
432 */
433 sync_blockdev(sbi->journal_bdev);
f98393a6 434 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 435 ext3_blkdev_remove(sbi);
436 }
437 sb->s_fs_info = NULL;
438 kfree(sbi);
439 return;
440}
441
e18b890b 442static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 443
444/*
445 * Called inside transaction, so use GFP_NOFS
446 */
447static struct inode *ext3_alloc_inode(struct super_block *sb)
448{
449 struct ext3_inode_info *ei;
450
e6b4f8da 451 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 452 if (!ei)
453 return NULL;
454#ifdef CONFIG_EXT3_FS_POSIX_ACL
455 ei->i_acl = EXT3_ACL_NOT_CACHED;
456 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
457#endif
458 ei->i_block_alloc_info = NULL;
459 ei->vfs_inode.i_version = 1;
460 return &ei->vfs_inode;
461}
462
463static void ext3_destroy_inode(struct inode *inode)
464{
9f7dd93d
VA		 465 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
466 printk("EXT3 Inode %p: orphan list check failed!\n",
467 EXT3_I(inode));
468 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
469 EXT3_I(inode), sizeof(struct ext3_inode_info),
470 false);
471 dump_stack();
472 }
1da177e4
LT		 473 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
474}
475
51cc5068 476static void init_once(void *foo)
1da177e4
LT		 477{
478 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
479
a35afb83 480 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 481#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 482 init_rwsem(&ei->xattr_sem);
1da177e4 483#endif
a35afb83
CL		 484 mutex_init(&ei->truncate_mutex);
485 inode_init_once(&ei->vfs_inode);
1da177e4 486}
ae6ddcc5 487
1da177e4
LT		 488static int init_inodecache(void)
489{
490 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
491 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 492 0, (SLAB_RECLAIM_ACCOUNT|
493 SLAB_MEM_SPREAD),
20c2df83 494 init_once);
1da177e4
LT		 495 if (ext3_inode_cachep == NULL)
496 return -ENOMEM;
497 return 0;
498}
499
500static void destroy_inodecache(void)
501{
1a1d92c1 502 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 503}
504
505static void ext3_clear_inode(struct inode *inode)
506{
507 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
508#ifdef CONFIG_EXT3_FS_POSIX_ACL
e6022603
AM		 509 if (EXT3_I(inode)->i_acl &&
510 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
511 posix_acl_release(EXT3_I(inode)->i_acl);
512 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
513 }
514 if (EXT3_I(inode)->i_default_acl &&
515 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
516 posix_acl_release(EXT3_I(inode)->i_default_acl);
517 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
518 }
1da177e4
LT		 519#endif
520 ext3_discard_reservation(inode);
521 EXT3_I(inode)->i_block_alloc_info = NULL;
e6022603
AM		 522 if (unlikely(rsv))
523 kfree(rsv);
1da177e4
LT		 524}
525
6cd37cda 526static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 527{
6cd37cda 528#if defined(CONFIG_QUOTA)
275abf5b 529 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 530
8fc2751b
MB		 531 if (sbi->s_jquota_fmt)
532 seq_printf(seq, ",jqfmt=%s",
533 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
534
535 if (sbi->s_qf_names[USRQUOTA])
536 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
537
538 if (sbi->s_qf_names[GRPQUOTA])
539 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
540
541 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
542 seq_puts(seq, ",usrquota");
543
544 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
545 seq_puts(seq, ",grpquota");
546#endif
6cd37cda
PO		 547}
548
571beed8
MS		 549/*
550 * Show an option if
551 * - it's set to a non-default value OR
552 * - if the per-sb default is different from the global default
553 */
6cd37cda
PO		 554static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
555{
556 struct super_block *sb = vfs->mnt_sb;
571beed8
MS		 557 struct ext3_sb_info *sbi = EXT3_SB(sb);
558 struct ext3_super_block *es = sbi->s_es;
559 unsigned long def_mount_opts;
560
561 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
562
563 if (sbi->s_sb_block != 1)
564 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
565 if (test_opt(sb, MINIX_DF))
566 seq_puts(seq, ",minixdf");
567 if (test_opt(sb, GRPID))
568 seq_puts(seq, ",grpid");
569 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
570 seq_puts(seq, ",nogrpid");
571 if (sbi->s_resuid != EXT3_DEF_RESUID ||
572 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
573 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
574 }
575 if (sbi->s_resgid != EXT3_DEF_RESGID ||
576 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
577 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
578 }
1eca93f9 579 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 580 int def_errors = le16_to_cpu(es->s_errors);
581
582 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 583 def_errors == EXT3_ERRORS_CONTINUE) {
584 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 585 }
586 }
1eca93f9
AK		 587 if (test_opt(sb, ERRORS_CONT))
588 seq_puts(seq, ",errors=continue");
571beed8
MS		 589 if (test_opt(sb, ERRORS_PANIC))
590 seq_puts(seq, ",errors=panic");
591 if (test_opt(sb, NO_UID32))
592 seq_puts(seq, ",nouid32");
593 if (test_opt(sb, DEBUG))
594 seq_puts(seq, ",debug");
595 if (test_opt(sb, OLDALLOC))
596 seq_puts(seq, ",oldalloc");
597#ifdef CONFIG_EXT3_FS_XATTR
598 if (test_opt(sb, XATTR_USER))
599 seq_puts(seq, ",user_xattr");
600 if (!test_opt(sb, XATTR_USER) &&
601 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
602 seq_puts(seq, ",nouser_xattr");
603 }
604#endif
605#ifdef CONFIG_EXT3_FS_POSIX_ACL
606 if (test_opt(sb, POSIX_ACL))
607 seq_puts(seq, ",acl");
608 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
609 seq_puts(seq, ",noacl");
610#endif
611 if (!test_opt(sb, RESERVATION))
612 seq_puts(seq, ",noreservation");
613 if (sbi->s_commit_interval) {
614 seq_printf(seq, ",commit=%u",
615 (unsigned) (sbi->s_commit_interval / HZ));
616 }
617 if (test_opt(sb, BARRIER))
618 seq_puts(seq, ",barrier=1");
619 if (test_opt(sb, NOBH))
620 seq_puts(seq, ",nobh");
6cd37cda
PO		 621
622 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
623 seq_puts(seq, ",data=journal");
624 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
625 seq_puts(seq, ",data=ordered");
626 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
627 seq_puts(seq, ",data=writeback");
628
0e4fb5e2
HK		 629 if (test_opt(sb, DATA_ERR_ABORT))
630 seq_puts(seq, ",data_err=abort");
631
6cd37cda 632 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 633
634 return 0;
635}
1da177e4 636
fdb36673 637
74af0baa
CH		 638static struct inode *ext3_nfs_get_inode(struct super_block *sb,
639 u64 ino, u32 generation)
fdb36673 640{
fdb36673 641 struct inode *inode;
fdb36673
N		 642
643 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
644 return ERR_PTR(-ESTALE);
645 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
646 return ERR_PTR(-ESTALE);
647
648 /* iget isn't really right if the inode is currently unallocated!!
649 *
650 * ext3_read_inode will return a bad_inode if the inode had been
651 * deleted, so we should be safe.
652 *
653 * Currently we don't know the generation for parent directory, so
654 * a generation of 0 means "accept any"
655 */
473043dc
DH		 656 inode = ext3_iget(sb, ino);
657 if (IS_ERR(inode))
658 return ERR_CAST(inode);
659 if (generation && inode->i_generation != generation) {
fdb36673
N		 660 iput(inode);
661 return ERR_PTR(-ESTALE);
662 }
74af0baa
CH		 663
664 return inode;
665}
666
667static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
668 int fh_len, int fh_type)
669{
670 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
671 ext3_nfs_get_inode);
672}
673
674static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
675 int fh_len, int fh_type)
676{
677 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
678 ext3_nfs_get_inode);
fdb36673
N		 679}
680
8fc2751b 681#ifdef CONFIG_QUOTA
1da177e4
LT		 682#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
683#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
684
685static int ext3_dquot_initialize(struct inode *inode, int type);
686static int ext3_dquot_drop(struct inode *inode);
687static int ext3_write_dquot(struct dquot *dquot);
688static int ext3_acquire_dquot(struct dquot *dquot);
689static int ext3_release_dquot(struct dquot *dquot);
690static int ext3_mark_dquot_dirty(struct dquot *dquot);
691static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f
JK		 692static int ext3_quota_on(struct super_block *sb, int type, int format_id,
693 char *path, int remount);
1da177e4
LT		 694static int ext3_quota_on_mount(struct super_block *sb, int type);
695static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
696 size_t len, loff_t off);
697static ssize_t ext3_quota_write(struct super_block *sb, int type,
698 const char *data, size_t len, loff_t off);
699
700static struct dquot_operations ext3_quota_operations = {
701 .initialize = ext3_dquot_initialize,
702 .drop = ext3_dquot_drop,
703 .alloc_space = dquot_alloc_space,
704 .alloc_inode = dquot_alloc_inode,
705 .free_space = dquot_free_space,
706 .free_inode = dquot_free_inode,
707 .transfer = dquot_transfer,
708 .write_dquot = ext3_write_dquot,
709 .acquire_dquot = ext3_acquire_dquot,
710 .release_dquot = ext3_release_dquot,
711 .mark_dirty = ext3_mark_dquot_dirty,
712 .write_info = ext3_write_info
713};
714
715static struct quotactl_ops ext3_qctl_operations = {
716 .quota_on = ext3_quota_on,
717 .quota_off = vfs_quota_off,
718 .quota_sync = vfs_quota_sync,
719 .get_info = vfs_get_dqinfo,
720 .set_info = vfs_set_dqinfo,
721 .get_dqblk = vfs_get_dqblk,
722 .set_dqblk = vfs_set_dqblk
723};
724#endif
725
ee9b6d61 726static const struct super_operations ext3_sops = {
1da177e4
LT		 727 .alloc_inode = ext3_alloc_inode,
728 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 729 .write_inode = ext3_write_inode,
730 .dirty_inode = ext3_dirty_inode,
731 .delete_inode = ext3_delete_inode,
732 .put_super = ext3_put_super,
733 .write_super = ext3_write_super,
734 .sync_fs = ext3_sync_fs,
735 .write_super_lockfs = ext3_write_super_lockfs,
736 .unlockfs = ext3_unlockfs,
737 .statfs = ext3_statfs,
738 .remount_fs = ext3_remount,
739 .clear_inode = ext3_clear_inode,
8fc2751b 740 .show_options = ext3_show_options,
1da177e4
LT		 741#ifdef CONFIG_QUOTA
742 .quota_read = ext3_quota_read,
743 .quota_write = ext3_quota_write,
744#endif
745};
746
39655164 747static const struct export_operations ext3_export_ops = {
74af0baa
CH		 748 .fh_to_dentry = ext3_fh_to_dentry,
749 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 750 .get_parent = ext3_get_parent,
751};
752
753enum {
754 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
755 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 756 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 757 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 758 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 759 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
1da177e4 760 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 761 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 762 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1f54587b 763 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
8fc2751b
MB		 764 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
765 Opt_grpquota
1da177e4
LT		 766};
767
a447c093 768static const match_table_t tokens = {
1da177e4
LT		 769 {Opt_bsd_df, "bsddf"},
770 {Opt_minix_df, "minixdf"},
771 {Opt_grpid, "grpid"},
772 {Opt_grpid, "bsdgroups"},
773 {Opt_nogrpid, "nogrpid"},
774 {Opt_nogrpid, "sysvgroups"},
775 {Opt_resgid, "resgid=%u"},
776 {Opt_resuid, "resuid=%u"},
777 {Opt_sb, "sb=%u"},
778 {Opt_err_cont, "errors=continue"},
779 {Opt_err_panic, "errors=panic"},
780 {Opt_err_ro, "errors=remount-ro"},
781 {Opt_nouid32, "nouid32"},
782 {Opt_nocheck, "nocheck"},
783 {Opt_nocheck, "check=none"},
1da177e4
LT		 784 {Opt_debug, "debug"},
785 {Opt_oldalloc, "oldalloc"},
786 {Opt_orlov, "orlov"},
787 {Opt_user_xattr, "user_xattr"},
788 {Opt_nouser_xattr, "nouser_xattr"},
789 {Opt_acl, "acl"},
790 {Opt_noacl, "noacl"},
791 {Opt_reservation, "reservation"},
792 {Opt_noreservation, "noreservation"},
793 {Opt_noload, "noload"},
794 {Opt_nobh, "nobh"},
ade1a29e 795 {Opt_bh, "bh"},
1da177e4
LT		 796 {Opt_commit, "commit=%u"},
797 {Opt_journal_update, "journal=update"},
798 {Opt_journal_inum, "journal=%u"},
71b96257 799 {Opt_journal_dev, "journal_dev=%u"},
1da177e4
LT		 800 {Opt_abort, "abort"},
801 {Opt_data_journal, "data=journal"},
802 {Opt_data_ordered, "data=ordered"},
803 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 804 {Opt_data_err_abort, "data_err=abort"},
805 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 806 {Opt_offusrjquota, "usrjquota="},
807 {Opt_usrjquota, "usrjquota=%s"},
808 {Opt_offgrpjquota, "grpjquota="},
809 {Opt_grpjquota, "grpjquota=%s"},
810 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
811 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
8fc2751b 812 {Opt_grpquota, "grpquota"},
1f54587b
JK		 813 {Opt_noquota, "noquota"},
814 {Opt_quota, "quota"},
8fc2751b 815 {Opt_usrquota, "usrquota"},
1da177e4 816 {Opt_barrier, "barrier=%u"},
1da177e4 817 {Opt_resize, "resize"},
92587216 818 {Opt_err, NULL},
1da177e4
LT		 819};
820
43d23f90 821static ext3_fsblk_t get_sb_block(void **data)
1da177e4 822{
e9ad5620
DK		 823 ext3_fsblk_t sb_block;
824 char *options = (char *) *data;
1da177e4
LT		 825
826 if (!options || strncmp(options, "sb=", 3) != 0)
827 return 1; /* Default location */
828 options += 3;
43d23f90 829 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 830 sb_block = simple_strtoul(options, &options, 0);
831 if (*options && *options != ',') {
832 printk("EXT3-fs: Invalid sb specification: %s\n",
833 (char *) *data);
834 return 1;
835 }
836 if (*options == ',')
837 options++;
838 *data = (void *) options;
839 return sb_block;
840}
841
71b96257 842static int parse_options (char *options, struct super_block *sb,
eee194e7 843 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 844 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 845{
846 struct ext3_sb_info *sbi = EXT3_SB(sb);
847 char * p;
848 substring_t args[MAX_OPT_ARGS];
849 int data_opt = 0;
850 int option;
851#ifdef CONFIG_QUOTA
d06bf1d2 852 int qtype, qfmt;
1da177e4
LT		 853 char *qname;
854#endif
855
856 if (!options)
857 return 1;
858
859 while ((p = strsep (&options, ",")) != NULL) {
860 int token;
861 if (!*p)
862 continue;
863
864 token = match_token(p, tokens, args);
865 switch (token) {
866 case Opt_bsd_df:
867 clear_opt (sbi->s_mount_opt, MINIX_DF);
868 break;
869 case Opt_minix_df:
870 set_opt (sbi->s_mount_opt, MINIX_DF);
871 break;
872 case Opt_grpid:
873 set_opt (sbi->s_mount_opt, GRPID);
874 break;
875 case Opt_nogrpid:
876 clear_opt (sbi->s_mount_opt, GRPID);
877 break;
878 case Opt_resuid:
879 if (match_int(&args[0], &option))
880 return 0;
881 sbi->s_resuid = option;
882 break;
883 case Opt_resgid:
884 if (match_int(&args[0], &option))
885 return 0;
886 sbi->s_resgid = option;
887 break;
888 case Opt_sb:
889 /* handled by get_sb_block() instead of here */
890 /* *sb_block = match_int(&args[0]); */
891 break;
892 case Opt_err_panic:
893 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
894 clear_opt (sbi->s_mount_opt, ERRORS_RO);
895 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
896 break;
897 case Opt_err_ro:
898 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
899 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
900 set_opt (sbi->s_mount_opt, ERRORS_RO);
901 break;
902 case Opt_err_cont:
903 clear_opt (sbi->s_mount_opt, ERRORS_RO);
904 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
905 set_opt (sbi->s_mount_opt, ERRORS_CONT);
906 break;
907 case Opt_nouid32:
908 set_opt (sbi->s_mount_opt, NO_UID32);
909 break;
1da177e4
LT		 910 case Opt_nocheck:
911 clear_opt (sbi->s_mount_opt, CHECK);
912 break;
913 case Opt_debug:
914 set_opt (sbi->s_mount_opt, DEBUG);
915 break;
916 case Opt_oldalloc:
917 set_opt (sbi->s_mount_opt, OLDALLOC);
918 break;
919 case Opt_orlov:
920 clear_opt (sbi->s_mount_opt, OLDALLOC);
921 break;
922#ifdef CONFIG_EXT3_FS_XATTR
923 case Opt_user_xattr:
924 set_opt (sbi->s_mount_opt, XATTR_USER);
925 break;
926 case Opt_nouser_xattr:
927 clear_opt (sbi->s_mount_opt, XATTR_USER);
928 break;
929#else
930 case Opt_user_xattr:
931 case Opt_nouser_xattr:
932 printk("EXT3 (no)user_xattr options not supported\n");
933 break;
934#endif
935#ifdef CONFIG_EXT3_FS_POSIX_ACL
936 case Opt_acl:
937 set_opt(sbi->s_mount_opt, POSIX_ACL);
938 break;
939 case Opt_noacl:
940 clear_opt(sbi->s_mount_opt, POSIX_ACL);
941 break;
942#else
943 case Opt_acl:
944 case Opt_noacl:
945 printk("EXT3 (no)acl options not supported\n");
946 break;
947#endif
948 case Opt_reservation:
949 set_opt(sbi->s_mount_opt, RESERVATION);
950 break;
951 case Opt_noreservation:
952 clear_opt(sbi->s_mount_opt, RESERVATION);
953 break;
954 case Opt_journal_update:
955 /* @@@ FIXME */
956 /* Eventually we will want to be able to create
957 a journal file here. For now, only allow the
958 user to specify an existing inode to be the
959 journal file. */
960 if (is_remount) {
961 printk(KERN_ERR "EXT3-fs: cannot specify "
962 "journal on remount\n");
963 return 0;
964 }
965 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
966 break;
967 case Opt_journal_inum:
968 if (is_remount) {
969 printk(KERN_ERR "EXT3-fs: cannot specify "
970 "journal on remount\n");
971 return 0;
972 }
973 if (match_int(&args[0], &option))
974 return 0;
975 *inum = option;
976 break;
71b96257
JL		 977 case Opt_journal_dev:
978 if (is_remount) {
979 printk(KERN_ERR "EXT3-fs: cannot specify "
980 "journal on remount\n");
981 return 0;
982 }
983 if (match_int(&args[0], &option))
984 return 0;
985 *journal_devnum = option;
986 break;
1da177e4
LT		 987 case Opt_noload:
988 set_opt (sbi->s_mount_opt, NOLOAD);
989 break;
990 case Opt_commit:
991 if (match_int(&args[0], &option))
992 return 0;
993 if (option < 0)
994 return 0;
995 if (option == 0)
996 option = JBD_DEFAULT_MAX_COMMIT_AGE;
997 sbi->s_commit_interval = HZ * option;
998 break;
999 case Opt_data_journal:
1000 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1001 goto datacheck;
1002 case Opt_data_ordered:
1003 data_opt = EXT3_MOUNT_ORDERED_DATA;
1004 goto datacheck;
1005 case Opt_data_writeback:
1006 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1007 datacheck:
1008 if (is_remount) {
1009 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1010 != data_opt) {
1011 printk(KERN_ERR
1012 "EXT3-fs: cannot change data "
1013 "mode on remount\n");
1014 return 0;
1015 }
1016 } else {
1017 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1018 sbi->s_mount_opt |= data_opt;
1019 }
1020 break;
0e4fb5e2
HK		 1021 case Opt_data_err_abort:
1022 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1023 break;
1024 case Opt_data_err_ignore:
1025 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1026 break;
1da177e4
LT		 1027#ifdef CONFIG_QUOTA
1028 case Opt_usrjquota:
1029 qtype = USRQUOTA;
1030 goto set_qf_name;
1031 case Opt_grpjquota:
1032 qtype = GRPQUOTA;
1033set_qf_name:
d06bf1d2
JK		 1034 if ((sb_any_quota_enabled(sb) ||
1035 sb_any_quota_suspended(sb)) &&
1036 !sbi->s_qf_names[qtype]) {
1da177e4 1037 printk(KERN_ERR
99aeaf63 1038 "EXT3-fs: Cannot change journaled "
1da177e4
LT		 1039 "quota options when quota turned on.\n");
1040 return 0;
1041 }
1042 qname = match_strdup(&args[0]);
1043 if (!qname) {
1044 printk(KERN_ERR
1045 "EXT3-fs: not enough memory for "
1046 "storing quotafile name.\n");
1047 return 0;
1048 }
1049 if (sbi->s_qf_names[qtype] &&
1050 strcmp(sbi->s_qf_names[qtype], qname)) {
1051 printk(KERN_ERR
1052 "EXT3-fs: %s quota file already "
1053 "specified.\n", QTYPE2NAME(qtype));
1054 kfree(qname);
1055 return 0;
1056 }
1057 sbi->s_qf_names[qtype] = qname;
1058 if (strchr(sbi->s_qf_names[qtype], '/')) {
1059 printk(KERN_ERR
1060 "EXT3-fs: quotafile must be on "
1061 "filesystem root.\n");
1062 kfree(sbi->s_qf_names[qtype]);
1063 sbi->s_qf_names[qtype] = NULL;
1064 return 0;
1065 }
1f54587b 1066 set_opt(sbi->s_mount_opt, QUOTA);
1da177e4
LT		 1067 break;
1068 case Opt_offusrjquota:
1069 qtype = USRQUOTA;
1070 goto clear_qf_name;
1071 case Opt_offgrpjquota:
1072 qtype = GRPQUOTA;
1073clear_qf_name:
d06bf1d2
JK		 1074 if ((sb_any_quota_enabled(sb) ||
1075 sb_any_quota_suspended(sb)) &&
1076 sbi->s_qf_names[qtype]) {
1da177e4 1077 printk(KERN_ERR "EXT3-fs: Cannot change "
99aeaf63 1078 "journaled quota options when "
1da177e4
LT		 1079 "quota turned on.\n");
1080 return 0;
1081 }
08c6a96f
JK		 1082 /*
1083 * The space will be released later when all options
1084 * are confirmed to be correct
1085 */
1da177e4
LT		 1086 sbi->s_qf_names[qtype] = NULL;
1087 break;
1088 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1089 qfmt = QFMT_VFS_OLD;
1090 goto set_qf_format;
1da177e4 1091 case Opt_jqfmt_vfsv0:
d06bf1d2
JK		 1092 qfmt = QFMT_VFS_V0;
1093set_qf_format:
1094 if ((sb_any_quota_enabled(sb) ||
1095 sb_any_quota_suspended(sb)) &&
1096 sbi->s_jquota_fmt != qfmt) {
1097 printk(KERN_ERR "EXT3-fs: Cannot change "
1098 "journaled quota options when "
1099 "quota turned on.\n");
1100 return 0;
1101 }
1102 sbi->s_jquota_fmt = qfmt;
1da177e4 1103 break;
1f54587b 1104 case Opt_quota:
8fc2751b
MB		 1105 case Opt_usrquota:
1106 set_opt(sbi->s_mount_opt, QUOTA);
1107 set_opt(sbi->s_mount_opt, USRQUOTA);
1108 break;
1109 case Opt_grpquota:
1f54587b 1110 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1111 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1112 break;
1113 case Opt_noquota:
d06bf1d2
JK		 1114 if (sb_any_quota_enabled(sb) ||
1115 sb_any_quota_suspended(sb)) {
1f54587b
JK		 1116 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1117 "options when quota turned on.\n");
1118 return 0;
1119 }
1120 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1121 clear_opt(sbi->s_mount_opt, USRQUOTA);
1122 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1123 break;
1da177e4 1124#else
8fc2751b
MB		 1125 case Opt_quota:
1126 case Opt_usrquota:
1127 case Opt_grpquota:
fa1ff1e0
JK		 1128 printk(KERN_ERR
1129 "EXT3-fs: quota options not supported.\n");
1130 break;
1da177e4
LT		 1131 case Opt_usrjquota:
1132 case Opt_grpjquota:
1133 case Opt_offusrjquota:
1134 case Opt_offgrpjquota:
1135 case Opt_jqfmt_vfsold:
1136 case Opt_jqfmt_vfsv0:
1137 printk(KERN_ERR
fa1ff1e0 1138 "EXT3-fs: journaled quota options not "
1da177e4
LT		 1139 "supported.\n");
1140 break;
1f54587b
JK		 1141 case Opt_noquota:
1142 break;
1da177e4
LT		 1143#endif
1144 case Opt_abort:
1145 set_opt(sbi->s_mount_opt, ABORT);
1146 break;
1147 case Opt_barrier:
1148 if (match_int(&args[0], &option))
1149 return 0;
1150 if (option)
1151 set_opt(sbi->s_mount_opt, BARRIER);
1152 else
1153 clear_opt(sbi->s_mount_opt, BARRIER);
1154 break;
1155 case Opt_ignore:
1156 break;
1157 case Opt_resize:
08c6a96f 1158 if (!is_remount) {
1da177e4
LT		 1159 printk("EXT3-fs: resize option only available "
1160 "for remount\n");
1161 return 0;
1162 }
c7f1721e
KZ		 1163 if (match_int(&args[0], &option) != 0)
1164 return 0;
1da177e4
LT		 1165 *n_blocks_count = option;
1166 break;
1167 case Opt_nobh:
1168 set_opt(sbi->s_mount_opt, NOBH);
1169 break;
ade1a29e
BP		 1170 case Opt_bh:
1171 clear_opt(sbi->s_mount_opt, NOBH);
1172 break;
1da177e4
LT		 1173 default:
1174 printk (KERN_ERR
1175 "EXT3-fs: Unrecognized mount option \"%s\" "
1176 "or missing value\n", p);
1177 return 0;
1178 }
1179 }
1180#ifdef CONFIG_QUOTA
8fc2751b
MB		 1181 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1182 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1183 sbi->s_qf_names[USRQUOTA])
1184 clear_opt(sbi->s_mount_opt, USRQUOTA);
1185
1186 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1187 sbi->s_qf_names[GRPQUOTA])
1188 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1189
1190 if ((sbi->s_qf_names[USRQUOTA] &&
1191 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1192 (sbi->s_qf_names[GRPQUOTA] &&
1193 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1194 printk(KERN_ERR "EXT3-fs: old and new quota "
1195 "format mixing.\n");
1196 return 0;
1197 }
1198
1199 if (!sbi->s_jquota_fmt) {
99aeaf63 1200 printk(KERN_ERR "EXT3-fs: journaled quota format "
8fc2751b
MB		 1201 "not specified.\n");
1202 return 0;
1203 }
1204 } else {
1205 if (sbi->s_jquota_fmt) {
99aeaf63
JK		 1206 printk(KERN_ERR "EXT3-fs: journaled quota format "
1207 "specified with no journaling "
8fc2751b
MB		 1208 "enabled.\n");
1209 return 0;
1210 }
1da177e4
LT		 1211 }
1212#endif
1da177e4
LT		 1213 return 1;
1214}
1215
1216static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1217 int read_only)
1218{
1219 struct ext3_sb_info *sbi = EXT3_SB(sb);
1220 int res = 0;
1221
1222 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1223 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1224 "forcing read-only mode\n");
1225 res = MS_RDONLY;
1226 }
1227 if (read_only)
1228 return res;
1229 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1230 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1231 "running e2fsck is recommended\n");
1232 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1233 printk (KERN_WARNING
1234 "EXT3-fs warning: mounting fs with errors, "
1235 "running e2fsck is recommended\n");
1236 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1237 le16_to_cpu(es->s_mnt_count) >=
1238 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1239 printk (KERN_WARNING
1240 "EXT3-fs warning: maximal mount count reached, "
1241 "running e2fsck is recommended\n");
1242 else if (le32_to_cpu(es->s_checkinterval) &&
1243 (le32_to_cpu(es->s_lastcheck) +
1244 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1245 printk (KERN_WARNING
1246 "EXT3-fs warning: checktime reached, "
1247 "running e2fsck is recommended\n");
1248#if 0
1249 /* @@@ We _will_ want to clear the valid bit if we find
1250 inconsistencies, to force a fsck at reboot. But for
1251 a plain journaled filesystem we can keep it set as
1252 valid forever! :) */
e7f23ebd 1253 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4
LT		 1254#endif
1255 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1256 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1257 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1258 es->s_mtime = cpu_to_le32(get_seconds());
1259 ext3_update_dynamic_rev(sb);
1260 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1261
1262 ext3_commit_super(sb, es, 1);
1263 if (test_opt(sb, DEBUG))
1264 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1265 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1266 sb->s_blocksize,
1267 sbi->s_groups_count,
1268 EXT3_BLOCKS_PER_GROUP(sb),
1269 EXT3_INODES_PER_GROUP(sb),
1270 sbi->s_mount_opt);
1271
1272 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1273 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1274 char b[BDEVNAME_SIZE];
1275
1276 printk("external journal on %s\n",
1277 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1278 } else {
1279 printk("internal journal\n");
1280 }
1da177e4
LT		 1281 return res;
1282}
1283
1284/* Called at mount-time, super-block is locked */
197cd65a 1285static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1286{
1287 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1288 int i;
1289
1290 ext3_debug ("Checking group descriptors");
1291
197cd65a
AM		 1292 for (i = 0; i < sbi->s_groups_count; i++) {
1293 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1294 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1295 ext3_fsblk_t last_block;
197cd65a 1296
855565e8
ES		 1297 if (i == sbi->s_groups_count - 1)
1298 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1299 else
1300 last_block = first_block +
1301 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1302
855565e8
ES		 1303 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1304 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1305 {
1306 ext3_error (sb, "ext3_check_descriptors",
1307 "Block bitmap for group %d"
1308 " not in group (block %lu)!",
1309 i, (unsigned long)
1310 le32_to_cpu(gdp->bg_block_bitmap));
1311 return 0;
1312 }
855565e8
ES		 1313 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1314 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1315 {
1316 ext3_error (sb, "ext3_check_descriptors",
1317 "Inode bitmap for group %d"
1318 " not in group (block %lu)!",
1319 i, (unsigned long)
1320 le32_to_cpu(gdp->bg_inode_bitmap));
1321 return 0;
1322 }
855565e8 1323 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1324 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1325 last_block)
1da177e4
LT		 1326 {
1327 ext3_error (sb, "ext3_check_descriptors",
1328 "Inode table for group %d"
1329 " not in group (block %lu)!",
1330 i, (unsigned long)
1331 le32_to_cpu(gdp->bg_inode_table));
1332 return 0;
1333 }
1da177e4
LT		 1334 }
1335
1336 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1337 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1338 return 1;
1339}
1340
1341
1342/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1343 * the superblock) which were deleted from all directories, but held open by
1344 * a process at the time of a crash. We walk the list and try to delete these
1345 * inodes at recovery time (only with a read-write filesystem).
1346 *
1347 * In order to keep the orphan inode chain consistent during traversal (in
1348 * case of crash during recovery), we link each inode into the superblock
1349 * orphan list_head and handle it the same way as an inode deletion during
1350 * normal operation (which journals the operations for us).
1351 *
1352 * We only do an iget() and an iput() on each inode, which is very safe if we
1353 * accidentally point at an in-use or already deleted inode. The worst that
1354 * can happen in this case is that we get a "bit already cleared" message from
1355 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1356 * e2fsck was run on this filesystem, and it must have already done the orphan
1357 * inode cleanup for us, so we can safely abort without any further action.
1358 */
1359static void ext3_orphan_cleanup (struct super_block * sb,
1360 struct ext3_super_block * es)
1361{
1362 unsigned int s_flags = sb->s_flags;
1363 int nr_orphans = 0, nr_truncates = 0;
1364#ifdef CONFIG_QUOTA
1365 int i;
1366#endif
1367 if (!es->s_last_orphan) {
1368 jbd_debug(4, "no orphan inodes to clean up\n");
1369 return;
1370 }
1371
a8f48a95
ES		 1372 if (bdev_read_only(sb->s_bdev)) {
1373 printk(KERN_ERR "EXT3-fs: write access "
1374 "unavailable, skipping orphan cleanup.\n");
1375 return;
1376 }
1377
1da177e4
LT		 1378 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1379 if (es->s_last_orphan)
1380 jbd_debug(1, "Errors on filesystem, "
1381 "clearing orphan list.\n");
1382 es->s_last_orphan = 0;
1383 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1384 return;
1385 }
1386
1387 if (s_flags & MS_RDONLY) {
1388 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1389 sb->s_id);
1390 sb->s_flags &= ~MS_RDONLY;
1391 }
1392#ifdef CONFIG_QUOTA
1393 /* Needed for iput() to work correctly and not trash data */
1394 sb->s_flags |= MS_ACTIVE;
1395 /* Turn on quotas so that they are updated correctly */
1396 for (i = 0; i < MAXQUOTAS; i++) {
1397 if (EXT3_SB(sb)->s_qf_names[i]) {
1398 int ret = ext3_quota_on_mount(sb, i);
1399 if (ret < 0)
1400 printk(KERN_ERR
99aeaf63 1401 "EXT3-fs: Cannot turn on journaled "
1da177e4
LT		 1402 "quota: error %d\n", ret);
1403 }
1404 }
1405#endif
1406
1407 while (es->s_last_orphan) {
1408 struct inode *inode;
1409
473043dc
DH		 1410 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1411 if (IS_ERR(inode)) {
1da177e4
LT		 1412 es->s_last_orphan = 0;
1413 break;
1414 }
1415
1416 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1417 DQUOT_INIT(inode);
1418 if (inode->i_nlink) {
1419 printk(KERN_DEBUG
eee194e7 1420 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1421 __func__, inode->i_ino, inode->i_size);
eee194e7 1422 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1423 inode->i_ino, inode->i_size);
1424 ext3_truncate(inode);
1425 nr_truncates++;
1426 } else {
1427 printk(KERN_DEBUG
eee194e7 1428 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1429 __func__, inode->i_ino);
eee194e7 1430 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1431 inode->i_ino);
1432 nr_orphans++;
1433 }
1434 iput(inode); /* The delete magic happens here! */
1435 }
1436
1437#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1438
1439 if (nr_orphans)
1440 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1441 sb->s_id, PLURAL(nr_orphans));
1442 if (nr_truncates)
1443 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1444 sb->s_id, PLURAL(nr_truncates));
1445#ifdef CONFIG_QUOTA
1446 /* Turn quotas off */
1447 for (i = 0; i < MAXQUOTAS; i++) {
1448 if (sb_dqopt(sb)->files[i])
2fd83a4f 1449 vfs_quota_off(sb, i, 0);
1da177e4
LT		 1450 }
1451#endif
1452 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1453}
1454
1da177e4
LT		 1455/*
1456 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1457 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1458 * We need to be 1 filesystem block less than the 2^32 sector limit.
1459 */
1460static loff_t ext3_max_size(int bits)
1461{
1462 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1463 int meta_blocks;
1464 loff_t upper_limit;
1465
1466 /* This is calculated to be the largest file size for a
1467 * dense, file such that the total number of
1da177e4 1468 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1469 * does not exceed 2^32 -1
1470 * __u32 i_blocks representing the total number of
1471 * 512 bytes blocks of the file
1472 */
1473 upper_limit = (1LL << 32) - 1;
1474
1475 /* total blocks in file system block size */
1476 upper_limit >>= (bits - 9);
1477
1478
1479 /* indirect blocks */
1480 meta_blocks = 1;
1481 /* double indirect blocks */
1482 meta_blocks += 1 + (1LL << (bits-2));
1483 /* tripple indirect blocks */
1484 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1485
1486 upper_limit -= meta_blocks;
1487 upper_limit <<= bits;
1da177e4
LT		 1488
1489 res += 1LL << (bits-2);
1490 res += 1LL << (2*(bits-2));
1491 res += 1LL << (3*(bits-2));
1492 res <<= bits;
1493 if (res > upper_limit)
1494 res = upper_limit;
fe7fdc37
AK		 1495
1496 if (res > MAX_LFS_FILESIZE)
1497 res = MAX_LFS_FILESIZE;
1498
1da177e4
LT		 1499 return res;
1500}
1501
43d23f90
MC		 1502static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1503 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1504 int nr)
1505{
1506 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1507 unsigned long bg, first_meta_bg;
1da177e4
LT		 1508 int has_super = 0;
1509
1da177e4
LT		 1510 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1511
1512 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1513 nr < first_meta_bg)
1514 return (logic_sb_block + nr + 1);
1515 bg = sbi->s_desc_per_block * nr;
1516 if (ext3_bg_has_super(sb, bg))
1517 has_super = 1;
43d23f90 1518 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1519}
1520
1521
1522static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1523{
1524 struct buffer_head * bh;
1525 struct ext3_super_block *es = NULL;
1526 struct ext3_sb_info *sbi;
43d23f90
MC		 1527 ext3_fsblk_t block;
1528 ext3_fsblk_t sb_block = get_sb_block(&data);
1529 ext3_fsblk_t logic_sb_block;
1da177e4 1530 unsigned long offset = 0;
eee194e7 1531 unsigned int journal_inum = 0;
71b96257 1532 unsigned long journal_devnum = 0;
1da177e4
LT		 1533 unsigned long def_mount_opts;
1534 struct inode *root;
1535 int blocksize;
1536 int hblock;
1537 int db_count;
1538 int i;
1539 int needs_recovery;
473043dc 1540 int ret = -EINVAL;
1da177e4 1541 __le32 features;
833f4077 1542 int err;
1da177e4 1543
f8314dc6 1544 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1545 if (!sbi)
1546 return -ENOMEM;
1547 sb->s_fs_info = sbi;
1da177e4
LT		 1548 sbi->s_mount_opt = 0;
1549 sbi->s_resuid = EXT3_DEF_RESUID;
1550 sbi->s_resgid = EXT3_DEF_RESGID;
571beed8 1551 sbi->s_sb_block = sb_block;
1da177e4
LT		 1552
1553 unlock_kernel();
1554
1555 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1556 if (!blocksize) {
1557 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1558 goto out_fail;
1559 }
1560
1561 /*
1562 * The ext3 superblock will not be buffer aligned for other than 1kB
1563 * block sizes. We need to calculate the offset from buffer start.
1564 */
1565 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1566 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1567 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1568 } else {
1569 logic_sb_block = sb_block;
1570 }
1571
1572 if (!(bh = sb_bread(sb, logic_sb_block))) {
1573 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1574 goto out_fail;
1575 }
1576 /*
1577 * Note: s_es must be initialized as soon as possible because
1578 * some ext3 macro-instructions depend on its value
1579 */
1580 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1581 sbi->s_es = es;
1582 sb->s_magic = le16_to_cpu(es->s_magic);
1583 if (sb->s_magic != EXT3_SUPER_MAGIC)
1584 goto cantfind_ext3;
1585
1586 /* Set defaults before we parse the mount options */
1587 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1588 if (def_mount_opts & EXT3_DEFM_DEBUG)
1589 set_opt(sbi->s_mount_opt, DEBUG);
1590 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1591 set_opt(sbi->s_mount_opt, GRPID);
1592 if (def_mount_opts & EXT3_DEFM_UID16)
1593 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1594#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1595 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1596 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1597#endif
1598#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1599 if (def_mount_opts & EXT3_DEFM_ACL)
1600 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1601#endif
1da177e4
LT		 1602 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1603 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1604 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1605 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1606 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1607 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1608
1609 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1610 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1611 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1612 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1613 else
1614 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 1615
1616 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1617 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1618
1619 set_opt(sbi->s_mount_opt, RESERVATION);
1620
71b96257
JL		 1621 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1622 NULL, 0))
1da177e4
LT		 1623 goto failed_mount;
1624
1625 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1626 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1627
1628 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1629 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1630 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1631 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ae6ddcc5 1632 printk(KERN_WARNING
1da177e4
LT		 1633 "EXT3-fs warning: feature flags set on rev 0 fs, "
1634 "running e2fsck is recommended\n");
1635 /*
1636 * Check feature flags regardless of the revision level, since we
1637 * previously didn't change the revision level when setting the flags,
1638 * so there is a chance incompat flags are set on a rev 0 filesystem.
1639 */
1640 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1641 if (features) {
1642 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1643 "unsupported optional features (%x).\n",
1644 sb->s_id, le32_to_cpu(features));
1645 goto failed_mount;
1646 }
1647 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1648 if (!(sb->s_flags & MS_RDONLY) && features) {
1649 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1650 "unsupported optional features (%x).\n",
1651 sb->s_id, le32_to_cpu(features));
1652 goto failed_mount;
1653 }
1654 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1655
1656 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1657 blocksize > EXT3_MAX_BLOCK_SIZE) {
ae6ddcc5 1658 printk(KERN_ERR
1da177e4
LT		 1659 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1660 blocksize, sb->s_id);
1661 goto failed_mount;
1662 }
1663
1664 hblock = bdev_hardsect_size(sb->s_bdev);
1665 if (sb->s_blocksize != blocksize) {
1666 /*
1667 * Make sure the blocksize for the filesystem is larger
1668 * than the hardware sectorsize for the machine.
1669 */
1670 if (blocksize < hblock) {
1671 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1672 "device blocksize %d.\n", blocksize, hblock);
1673 goto failed_mount;
1674 }
1675
1676 brelse (bh);
0f0a89eb
TS		 1677 if (!sb_set_blocksize(sb, blocksize)) {
1678 printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1679 blocksize);
1680 goto out_fail;
1681 }
1da177e4
LT		 1682 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1683 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1684 bh = sb_bread(sb, logic_sb_block);
1685 if (!bh) {
ae6ddcc5 1686 printk(KERN_ERR
1da177e4
LT		 1687 "EXT3-fs: Can't read superblock on 2nd try.\n");
1688 goto failed_mount;
1689 }
1690 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1691 sbi->s_es = es;
1692 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
ae6ddcc5 1693 printk (KERN_ERR
1da177e4
LT		 1694 "EXT3-fs: Magic mismatch, very weird !\n");
1695 goto failed_mount;
1696 }
1697 }
1698
1699 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1700
1701 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1702 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1703 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1704 } else {
1705 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1706 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1707 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1708 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4
LT		 1709 (sbi->s_inode_size > blocksize)) {
1710 printk (KERN_ERR
1711 "EXT3-fs: unsupported inode size: %d\n",
1712 sbi->s_inode_size);
1713 goto failed_mount;
1714 }
1715 }
1716 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1717 le32_to_cpu(es->s_log_frag_size);
1718 if (blocksize != sbi->s_frag_size) {
1719 printk(KERN_ERR
1720 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1721 sbi->s_frag_size, blocksize);
1722 goto failed_mount;
1723 }
1724 sbi->s_frags_per_block = 1;
1725 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1726 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1727 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1728 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1729 goto cantfind_ext3;
1730 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1731 if (sbi->s_inodes_per_block == 0)
1732 goto cantfind_ext3;
1733 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1734 sbi->s_inodes_per_block;
1735 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1736 sbi->s_sbh = bh;
1737 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1738 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1739 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1740 for (i=0; i < 4; i++)
1741 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1742 sbi->s_def_hash_version = es->s_def_hash_version;
1743
1744 if (sbi->s_blocks_per_group > blocksize * 8) {
1745 printk (KERN_ERR
1746 "EXT3-fs: #blocks per group too big: %lu\n",
1747 sbi->s_blocks_per_group);
1748 goto failed_mount;
1749 }
1750 if (sbi->s_frags_per_group > blocksize * 8) {
1751 printk (KERN_ERR
1752 "EXT3-fs: #fragments per group too big: %lu\n",
1753 sbi->s_frags_per_group);
1754 goto failed_mount;
1755 }
1756 if (sbi->s_inodes_per_group > blocksize * 8) {
1757 printk (KERN_ERR
1758 "EXT3-fs: #inodes per group too big: %lu\n",
1759 sbi->s_inodes_per_group);
1760 goto failed_mount;
1761 }
1762
fcd5df35
MC		 1763 if (le32_to_cpu(es->s_blocks_count) >
1764 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1765 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1766 " too large to mount safely\n", sb->s_id);
1767 if (sizeof(sector_t) < 8)
1768 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1769 "enabled\n");
1770 goto failed_mount;
1771 }
1772
1da177e4
LT		 1773 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1774 goto cantfind_ext3;
855565e8
ES		 1775 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1776 le32_to_cpu(es->s_first_data_block) - 1)
1777 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1da177e4
LT		 1778 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1779 EXT3_DESC_PER_BLOCK(sb);
1780 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1781 GFP_KERNEL);
1782 if (sbi->s_group_desc == NULL) {
1783 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1784 goto failed_mount;
1785 }
1786
1da177e4
LT		 1787 bgl_lock_init(&sbi->s_blockgroup_lock);
1788
1789 for (i = 0; i < db_count; i++) {
1790 block = descriptor_loc(sb, logic_sb_block, i);
1791 sbi->s_group_desc[i] = sb_bread(sb, block);
1792 if (!sbi->s_group_desc[i]) {
1793 printk (KERN_ERR "EXT3-fs: "
1794 "can't read group descriptor %d\n", i);
1795 db_count = i;
1796 goto failed_mount2;
1797 }
1798 }
1799 if (!ext3_check_descriptors (sb)) {
d2e5b13c 1800 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1da177e4
LT		 1801 goto failed_mount2;
1802 }
1803 sbi->s_gdb_count = db_count;
1804 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1805 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1806
833f4077
PZ		 1807 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1808 ext3_count_free_blocks(sb));
1809 if (!err) {
1810 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1811 ext3_count_free_inodes(sb));
1812 }
1813 if (!err) {
1814 err = percpu_counter_init(&sbi->s_dirs_counter,
1815 ext3_count_dirs(sb));
1816 }
1817 if (err) {
1818 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1819 goto failed_mount3;
1820 }
0216bfcf 1821
1da177e4
LT		 1822 /* per fileystem reservation list head & lock */
1823 spin_lock_init(&sbi->s_rsv_window_lock);
1824 sbi->s_rsv_window_root = RB_ROOT;
1825 /* Add a single, static dummy reservation to the start of the
1826 * reservation window list --- it gives us a placeholder for
1827 * append-at-start-of-list which makes the allocation logic
1828 * _much_ simpler. */
1829 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1830 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1831 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1832 sbi->s_rsv_window_head.rsv_goal_size = 0;
1833 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1834
1835 /*
1836 * set up enough so that it can read an inode
1837 */
1838 sb->s_op = &ext3_sops;
1839 sb->s_export_op = &ext3_export_ops;
1840 sb->s_xattr = ext3_xattr_handlers;
1841#ifdef CONFIG_QUOTA
1842 sb->s_qcop = &ext3_qctl_operations;
1843 sb->dq_op = &ext3_quota_operations;
1844#endif
1845 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1846
1847 sb->s_root = NULL;
1848
1849 needs_recovery = (es->s_last_orphan != 0 ||
1850 EXT3_HAS_INCOMPAT_FEATURE(sb,
1851 EXT3_FEATURE_INCOMPAT_RECOVER));
1852
1853 /*
1854 * The first inode we look at is the journal inode. Don't try
1855 * root first: it may be modified in the journal!
1856 */
1857 if (!test_opt(sb, NOLOAD) &&
1858 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1859 if (ext3_load_journal(sb, es, journal_devnum))
0216bfcf 1860 goto failed_mount3;
1da177e4
LT		 1861 } else if (journal_inum) {
1862 if (ext3_create_journal(sb, es, journal_inum))
0216bfcf 1863 goto failed_mount3;
1da177e4
LT		 1864 } else {
1865 if (!silent)
1866 printk (KERN_ERR
1867 "ext3: No journal on filesystem on %s\n",
1868 sb->s_id);
0216bfcf 1869 goto failed_mount3;
1da177e4
LT		 1870 }
1871
1872 /* We have now updated the journal if required, so we can
1873 * validate the data journaling mode. */
1874 switch (test_opt(sb, DATA_FLAGS)) {
1875 case 0:
1876 /* No mode set, assume a default based on the journal
1877 capabilities: ORDERED_DATA if the journal can
1878 cope, else JOURNAL_DATA */
1879 if (journal_check_available_features
1880 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1881 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1882 else
1883 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1884 break;
1885
1886 case EXT3_MOUNT_ORDERED_DATA:
1887 case EXT3_MOUNT_WRITEBACK_DATA:
1888 if (!journal_check_available_features
1889 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1890 printk(KERN_ERR "EXT3-fs: Journal does not support "
1891 "requested data journaling mode\n");
0216bfcf 1892 goto failed_mount4;
1da177e4
LT		 1893 }
1894 default:
1895 break;
1896 }
1897
1898 if (test_opt(sb, NOBH)) {
1da177e4
LT		 1899 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1900 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1901 "its supported only with writeback mode\n");
1902 clear_opt(sbi->s_mount_opt, NOBH);
1903 }
1904 }
1905 /*
1906 * The journal_load will have done any necessary log recovery,
1907 * so we can safely mount the rest of the filesystem now.
1908 */
1909
473043dc
DH		 1910 root = ext3_iget(sb, EXT3_ROOT_INO);
1911 if (IS_ERR(root)) {
1da177e4 1912 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
473043dc 1913 ret = PTR_ERR(root);
0216bfcf 1914 goto failed_mount4;
1da177e4
LT		 1915 }
1916 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 1917 iput(root);
1da177e4 1918 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
0216bfcf 1919 goto failed_mount4;
1da177e4 1920 }
473043dc
DH		 1921 sb->s_root = d_alloc_root(root);
1922 if (!sb->s_root) {
1923 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1924 iput(root);
1925 ret = -ENOMEM;
1926 goto failed_mount4;
1927 }
1da177e4
LT		 1928
1929 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1930 /*
1931 * akpm: core read_super() calls in here with the superblock locked.
1932 * That deadlocks, because orphan cleanup needs to lock the superblock
1933 * in numerous places. Here we just pop the lock - it's relatively
1934 * harmless, because we are now ready to accept write_super() requests,
1935 * and aviro says that's the only reason for hanging onto the
1936 * superblock lock.
1937 */
1938 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1939 ext3_orphan_cleanup(sb, es);
1940 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1941 if (needs_recovery)
1942 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1943 ext3_mark_recovery_complete(sb, es);
1944 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1945 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1946 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1947 "writeback");
1948
1da177e4
LT		 1949 lock_kernel();
1950 return 0;
1951
1952cantfind_ext3:
1953 if (!silent)
1954 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1955 sb->s_id);
1956 goto failed_mount;
1957
0216bfcf 1958failed_mount4:
1da177e4 1959 journal_destroy(sbi->s_journal);
0216bfcf
MC		 1960failed_mount3:
1961 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1962 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1963 percpu_counter_destroy(&sbi->s_dirs_counter);
1da177e4
LT		 1964failed_mount2:
1965 for (i = 0; i < db_count; i++)
1966 brelse(sbi->s_group_desc[i]);
1967 kfree(sbi->s_group_desc);
1968failed_mount:
1969#ifdef CONFIG_QUOTA
1970 for (i = 0; i < MAXQUOTAS; i++)
1971 kfree(sbi->s_qf_names[i]);
1972#endif
1973 ext3_blkdev_remove(sbi);
1974 brelse(bh);
1975out_fail:
1976 sb->s_fs_info = NULL;
1977 kfree(sbi);
1978 lock_kernel();
473043dc 1979 return ret;
1da177e4
LT		 1980}
1981
1982/*
1983 * Setup any per-fs journal parameters now. We'll do this both on
1984 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 1985 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 1986 */
1987static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1988{
1989 struct ext3_sb_info *sbi = EXT3_SB(sb);
1990
1991 if (sbi->s_commit_interval)
1992 journal->j_commit_interval = sbi->s_commit_interval;
1993 /* We could also set up an ext3-specific default for the commit
1994 * interval here, but for now we'll just fall back to the jbd
1995 * default. */
1996
1997 spin_lock(&journal->j_state_lock);
1998 if (test_opt(sb, BARRIER))
1999 journal->j_flags |= JFS_BARRIER;
2000 else
2001 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2002 if (test_opt(sb, DATA_ERR_ABORT))
2003 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2004 else
2005 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2006 spin_unlock(&journal->j_state_lock);
2007}
2008
eee194e7
ES		 2009static journal_t *ext3_get_journal(struct super_block *sb,
2010 unsigned int journal_inum)
1da177e4
LT		 2011{
2012 struct inode *journal_inode;
2013 journal_t *journal;
2014
2015 /* First, test for the existence of a valid inode on disk. Bad
2016 * things happen if we iget() an unused inode, as the subsequent
2017 * iput() will try to delete it. */
2018
473043dc
DH		 2019 journal_inode = ext3_iget(sb, journal_inum);
2020 if (IS_ERR(journal_inode)) {
1da177e4
LT		 2021 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2022 return NULL;
2023 }
2024 if (!journal_inode->i_nlink) {
2025 make_bad_inode(journal_inode);
2026 iput(journal_inode);
2027 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2028 return NULL;
2029 }
2030
2031 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2032 journal_inode, journal_inode->i_size);
473043dc 2033 if (!S_ISREG(journal_inode->i_mode)) {
1da177e4
LT		 2034 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2035 iput(journal_inode);
2036 return NULL;
2037 }
2038
2039 journal = journal_init_inode(journal_inode);
2040 if (!journal) {
2041 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2042 iput(journal_inode);
2043 return NULL;
2044 }
2045 journal->j_private = sb;
2046 ext3_init_journal_params(sb, journal);
2047 return journal;
2048}
2049
2050static journal_t *ext3_get_dev_journal(struct super_block *sb,
2051 dev_t j_dev)
2052{
2053 struct buffer_head * bh;
2054 journal_t *journal;
43d23f90 2055 ext3_fsblk_t start;
1c2bf374 2056 ext3_fsblk_t len;
1da177e4 2057 int hblock, blocksize;
43d23f90 2058 ext3_fsblk_t sb_block;
1da177e4
LT		 2059 unsigned long offset;
2060 struct ext3_super_block * es;
2061 struct block_device *bdev;
2062
2063 bdev = ext3_blkdev_get(j_dev);
2064 if (bdev == NULL)
2065 return NULL;
2066
2067 if (bd_claim(bdev, sb)) {
2068 printk(KERN_ERR
2069 "EXT3: failed to claim external journal device.\n");
9a1c3542 2070 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1da177e4
LT		 2071 return NULL;
2072 }
2073
2074 blocksize = sb->s_blocksize;
2075 hblock = bdev_hardsect_size(bdev);
2076 if (blocksize < hblock) {
2077 printk(KERN_ERR
2078 "EXT3-fs: blocksize too small for journal device.\n");
2079 goto out_bdev;
2080 }
2081
2082 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2083 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2084 set_blocksize(bdev, blocksize);
2085 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2086 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2087 "external journal\n");
2088 goto out_bdev;
2089 }
2090
2091 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2092 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2093 !(le32_to_cpu(es->s_feature_incompat) &
2094 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2095 printk(KERN_ERR "EXT3-fs: external journal has "
2096 "bad superblock\n");
2097 brelse(bh);
2098 goto out_bdev;
2099 }
2100
2101 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2102 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2103 brelse(bh);
2104 goto out_bdev;
2105 }
2106
2107 len = le32_to_cpu(es->s_blocks_count);
2108 start = sb_block + 1;
2109 brelse(bh); /* we're done with the superblock */
2110
2111 journal = journal_init_dev(bdev, sb->s_bdev,
2112 start, len, blocksize);
2113 if (!journal) {
2114 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2115 goto out_bdev;
2116 }
2117 journal->j_private = sb;
2118 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2119 wait_on_buffer(journal->j_sb_buffer);
2120 if (!buffer_uptodate(journal->j_sb_buffer)) {
2121 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2122 goto out_journal;
2123 }
2124 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2125 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2126 "user (unsupported) - %d\n",
2127 be32_to_cpu(journal->j_superblock->s_nr_users));
2128 goto out_journal;
2129 }
2130 EXT3_SB(sb)->journal_bdev = bdev;
2131 ext3_init_journal_params(sb, journal);
2132 return journal;
2133out_journal:
2134 journal_destroy(journal);
2135out_bdev:
2136 ext3_blkdev_put(bdev);
2137 return NULL;
2138}
2139
71b96257
JL		 2140static int ext3_load_journal(struct super_block *sb,
2141 struct ext3_super_block *es,
2142 unsigned long journal_devnum)
1da177e4
LT		 2143{
2144 journal_t *journal;
eee194e7 2145 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2146 dev_t journal_dev;
1da177e4
LT		 2147 int err = 0;
2148 int really_read_only;
2149
71b96257
JL		 2150 if (journal_devnum &&
2151 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2152 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2153 "numbers have changed\n");
2154 journal_dev = new_decode_dev(journal_devnum);
2155 } else
2156 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2157
1da177e4
LT		 2158 really_read_only = bdev_read_only(sb->s_bdev);
2159
2160 /*
2161 * Are we loading a blank journal or performing recovery after a
2162 * crash? For recovery, we need to check in advance whether we
2163 * can get read-write access to the device.
2164 */
2165
2166 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2167 if (sb->s_flags & MS_RDONLY) {
2168 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2169 "required on readonly filesystem.\n");
2170 if (really_read_only) {
2171 printk(KERN_ERR "EXT3-fs: write access "
2172 "unavailable, cannot proceed.\n");
2173 return -EROFS;
2174 }
2175 printk (KERN_INFO "EXT3-fs: write access will "
2176 "be enabled during recovery.\n");
2177 }
2178 }
2179
2180 if (journal_inum && journal_dev) {
2181 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2182 "and inode journals!\n");
2183 return -EINVAL;
2184 }
2185
2186 if (journal_inum) {
2187 if (!(journal = ext3_get_journal(sb, journal_inum)))
2188 return -EINVAL;
2189 } else {
2190 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2191 return -EINVAL;
2192 }
2193
2194 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2195 err = journal_update_format(journal);
2196 if (err) {
2197 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2198 journal_destroy(journal);
2199 return err;
2200 }
2201 }
2202
2203 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2204 err = journal_wipe(journal, !really_read_only);
2205 if (!err)
2206 err = journal_load(journal);
2207
2208 if (err) {
2209 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2210 journal_destroy(journal);
2211 return err;
2212 }
2213
2214 EXT3_SB(sb)->s_journal = journal;
2215 ext3_clear_journal_err(sb, es);
71b96257
JL		 2216
2217 if (journal_devnum &&
2218 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2219 es->s_journal_dev = cpu_to_le32(journal_devnum);
2220 sb->s_dirt = 1;
2221
2222 /* Make sure we flush the recovery flag to disk. */
2223 ext3_commit_super(sb, es, 1);
2224 }
2225
1da177e4
LT		 2226 return 0;
2227}
2228
2229static int ext3_create_journal(struct super_block * sb,
2230 struct ext3_super_block * es,
eee194e7 2231 unsigned int journal_inum)
1da177e4
LT		 2232{
2233 journal_t *journal;
952d9de1 2234 int err;
1da177e4
LT		 2235
2236 if (sb->s_flags & MS_RDONLY) {
2237 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2238 "create journal.\n");
2239 return -EROFS;
2240 }
2241
952d9de1
BP		 2242 journal = ext3_get_journal(sb, journal_inum);
2243 if (!journal)
1da177e4
LT		 2244 return -EINVAL;
2245
eee194e7 2246 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
1da177e4
LT		 2247 journal_inum);
2248
952d9de1
BP		 2249 err = journal_create(journal);
2250 if (err) {
1da177e4
LT		 2251 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2252 journal_destroy(journal);
2253 return -EIO;
2254 }
2255
2256 EXT3_SB(sb)->s_journal = journal;
2257
2258 ext3_update_dynamic_rev(sb);
2259 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2260 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2261
2262 es->s_journal_inum = cpu_to_le32(journal_inum);
2263 sb->s_dirt = 1;
2264
2265 /* Make sure we flush the recovery flag to disk. */
2266 ext3_commit_super(sb, es, 1);
2267
2268 return 0;
2269}
2270
2271static void ext3_commit_super (struct super_block * sb,
2272 struct ext3_super_block * es,
2273 int sync)
2274{
2275 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2276
2277 if (!sbh)
2278 return;
2279 es->s_wtime = cpu_to_le32(get_seconds());
2280 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2281 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2282 BUFFER_TRACE(sbh, "marking dirty");
2283 mark_buffer_dirty(sbh);
2284 if (sync)
2285 sync_dirty_buffer(sbh);
2286}
2287
2288
2289/*
2290 * Have we just finished recovery? If so, and if we are mounting (or
2291 * remounting) the filesystem readonly, then we will end up with a
2292 * consistent fs on disk. Record that fact.
2293 */
2294static void ext3_mark_recovery_complete(struct super_block * sb,
2295 struct ext3_super_block * es)
2296{
2297 journal_t *journal = EXT3_SB(sb)->s_journal;
2298
2299 journal_lock_updates(journal);
2d7c820e
HK		 2300 if (journal_flush(journal) < 0)
2301 goto out;
2302
030703e4 2303 lock_super(sb);
1da177e4
LT		 2304 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2305 sb->s_flags & MS_RDONLY) {
2306 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2307 sb->s_dirt = 0;
2308 ext3_commit_super(sb, es, 1);
2309 }
030703e4 2310 unlock_super(sb);
2d7c820e
HK		 2311
2312out:
1da177e4
LT		 2313 journal_unlock_updates(journal);
2314}
2315
2316/*
2317 * If we are mounting (or read-write remounting) a filesystem whose journal
2318 * has recorded an error from a previous lifetime, move that error to the
2319 * main filesystem now.
2320 */
2321static void ext3_clear_journal_err(struct super_block * sb,
2322 struct ext3_super_block * es)
2323{
2324 journal_t *journal;
2325 int j_errno;
2326 const char *errstr;
2327
2328 journal = EXT3_SB(sb)->s_journal;
2329
2330 /*
2331 * Now check for any error status which may have been recorded in the
2332 * journal by a prior ext3_error() or ext3_abort()
2333 */
2334
2335 j_errno = journal_errno(journal);
2336 if (j_errno) {
2337 char nbuf[16];
2338
2339 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2340 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2341 "from previous mount: %s", errstr);
e05b6b52 2342 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2343 "filesystem check.");
2344
2345 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2346 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2347 ext3_commit_super (sb, es, 1);
2348
2349 journal_clear_err(journal);
2350 }
2351}
2352
2353/*
2354 * Force the running and committing transactions to commit,
2355 * and wait on the commit.
2356 */
2357int ext3_force_commit(struct super_block *sb)
2358{
2359 journal_t *journal;
2360 int ret;
2361
2362 if (sb->s_flags & MS_RDONLY)
2363 return 0;
2364
2365 journal = EXT3_SB(sb)->s_journal;
2366 sb->s_dirt = 0;
2367 ret = ext3_journal_force_commit(journal);
2368 return ret;
2369}
2370
2371/*
2372 * Ext3 always journals updates to the superblock itself, so we don't
2373 * have to propagate any other updates to the superblock on disk at this
2374 * point. Just start an async writeback to get the buffers on their way
2375 * to the disk.
2376 *
2377 * This implicitly triggers the writebehind on sync().
2378 */
2379
2380static void ext3_write_super (struct super_block * sb)
2381{
7892f2f4 2382 if (mutex_trylock(&sb->s_lock) != 0)
1da177e4
LT		 2383 BUG();
2384 sb->s_dirt = 0;
2385}
2386
2387static int ext3_sync_fs(struct super_block *sb, int wait)
2388{
2389 tid_t target;
2390
2391 sb->s_dirt = 0;
2392 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2393 if (wait)
2394 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2395 }
2396 return 0;
2397}
2398
2399/*
2400 * LVM calls this function before a (read-only) snapshot is created. This
2401 * gives us a chance to flush the journal completely and mark the fs clean.
2402 */
2403static void ext3_write_super_lockfs(struct super_block *sb)
2404{
2405 sb->s_dirt = 0;
2406
2407 if (!(sb->s_flags & MS_RDONLY)) {
2408 journal_t *journal = EXT3_SB(sb)->s_journal;
2409
2410 /* Now we set up the journal barrier. */
2411 journal_lock_updates(journal);
2d7c820e
HK		 2412
2413 /*
2414 * We don't want to clear needs_recovery flag when we failed
2415 * to flush the journal.
2416 */
2417 if (journal_flush(journal) < 0)
2418 return;
1da177e4
LT		 2419
2420 /* Journal blocked and flushed, clear needs_recovery flag. */
2421 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2422 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2423 }
2424}
2425
2426/*
2427 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2428 * flag here, even though the filesystem is not technically dirty yet.
2429 */
2430static void ext3_unlockfs(struct super_block *sb)
2431{
2432 if (!(sb->s_flags & MS_RDONLY)) {
2433 lock_super(sb);
2434 /* Reser the needs_recovery flag before the fs is unlocked. */
2435 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2436 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2437 unlock_super(sb);
2438 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2439 }
2440}
2441
2442static int ext3_remount (struct super_block * sb, int * flags, char * data)
2443{
2444 struct ext3_super_block * es;
2445 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2446 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2447 unsigned long old_sb_flags;
2448 struct ext3_mount_options old_opts;
2449 int err;
2450#ifdef CONFIG_QUOTA
2451 int i;
2452#endif
2453
2454 /* Store the original options */
2455 old_sb_flags = sb->s_flags;
2456 old_opts.s_mount_opt = sbi->s_mount_opt;
2457 old_opts.s_resuid = sbi->s_resuid;
2458 old_opts.s_resgid = sbi->s_resgid;
2459 old_opts.s_commit_interval = sbi->s_commit_interval;
2460#ifdef CONFIG_QUOTA
2461 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2462 for (i = 0; i < MAXQUOTAS; i++)
2463 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2464#endif
1da177e4
LT		 2465
2466 /*
2467 * Allow the "check" option to be passed as a remount option.
2468 */
71b96257 2469 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2470 err = -EINVAL;
2471 goto restore_opts;
2472 }
1da177e4
LT		 2473
2474 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
e05b6b52 2475 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2476
2477 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2478 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2479
2480 es = sbi->s_es;
2481
2482 ext3_init_journal_params(sb, sbi->s_journal);
2483
2484 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2485 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
08c6a96f
JK		 2486 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2487 err = -EROFS;
2488 goto restore_opts;
2489 }
1da177e4
LT		 2490
2491 if (*flags & MS_RDONLY) {
2492 /*
2493 * First of all, the unconditional stuff we have to do
2494 * to disable replay of the journal when we next remount
2495 */
2496 sb->s_flags |= MS_RDONLY;
2497
2498 /*
2499 * OK, test if we are remounting a valid rw partition
2500 * readonly, and if so set the rdonly flag and then
2501 * mark the partition as valid again.
2502 */
2503 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2504 (sbi->s_mount_state & EXT3_VALID_FS))
2505 es->s_state = cpu_to_le16(sbi->s_mount_state);
2506
030703e4
JK		 2507 /*
2508 * We have to unlock super so that we can wait for
2509 * transactions.
2510 */
2511 unlock_super(sb);
1da177e4 2512 ext3_mark_recovery_complete(sb, es);
030703e4 2513 lock_super(sb);
1da177e4
LT		 2514 } else {
2515 __le32 ret;
2516 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2517 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2518 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2519 "remount RDWR because of unsupported "
2520 "optional features (%x).\n",
2521 sb->s_id, le32_to_cpu(ret));
08c6a96f
JK		 2522 err = -EROFS;
2523 goto restore_opts;
1da177e4 2524 }
ea9a05a1
ES		 2525
2526 /*
2527 * If we have an unprocessed orphan list hanging
2528 * around from a previously readonly bdev mount,
2529 * require a full umount/remount for now.
2530 */
2531 if (es->s_last_orphan) {
2532 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2533 "remount RDWR because of unprocessed "
2534 "orphan inode list. Please "
2535 "umount/remount instead.\n",
2536 sb->s_id);
2537 err = -EINVAL;
2538 goto restore_opts;
2539 }
2540
1da177e4
LT		 2541 /*
2542 * Mounting a RDONLY partition read-write, so reread
2543 * and store the current valid flag. (It may have
2544 * been changed by e2fsck since we originally mounted
2545 * the partition.)
2546 */
2547 ext3_clear_journal_err(sb, es);
2548 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2549 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2550 goto restore_opts;
1da177e4
LT		 2551 if (!ext3_setup_super (sb, es, 0))
2552 sb->s_flags &= ~MS_RDONLY;
2553 }
2554 }
08c6a96f
JK		 2555#ifdef CONFIG_QUOTA
2556 /* Release old quota file names */
2557 for (i = 0; i < MAXQUOTAS; i++)
2558 if (old_opts.s_qf_names[i] &&
2559 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2560 kfree(old_opts.s_qf_names[i]);
2561#endif
1da177e4 2562 return 0;
08c6a96f
JK		 2563restore_opts:
2564 sb->s_flags = old_sb_flags;
2565 sbi->s_mount_opt = old_opts.s_mount_opt;
2566 sbi->s_resuid = old_opts.s_resuid;
2567 sbi->s_resgid = old_opts.s_resgid;
2568 sbi->s_commit_interval = old_opts.s_commit_interval;
2569#ifdef CONFIG_QUOTA
2570 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2571 for (i = 0; i < MAXQUOTAS; i++) {
2572 if (sbi->s_qf_names[i] &&
2573 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2574 kfree(sbi->s_qf_names[i]);
2575 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2576 }
2577#endif
2578 return err;
1da177e4
LT		 2579}
2580
726c3342 2581static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2582{
726c3342 2583 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2584 struct ext3_sb_info *sbi = EXT3_SB(sb);
2585 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2586 u64 fsid;
1da177e4 2587
a71ce8c6
BP		 2588 if (test_opt(sb, MINIX_DF)) {
2589 sbi->s_overhead_last = 0;
2590 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2591 unsigned long ngroups = sbi->s_groups_count, i;
2592 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2593 smp_rmb();
2594
2595 /*
a71ce8c6
BP		 2596 * Compute the overhead (FS structures). This is constant
2597 * for a given filesystem unless the number of block groups
2598 * changes so we cache the previous value until it does.
1da177e4
LT		 2599 */
2600
2601 /*
2602 * All of the blocks before first_data_block are
2603 * overhead
2604 */
2605 overhead = le32_to_cpu(es->s_first_data_block);
2606
2607 /*
2608 * Add the overhead attributed to the superblock and
2609 * block group descriptors. If the sparse superblocks
2610 * feature is turned on, then not all groups have this.
2611 */
2612 for (i = 0; i < ngroups; i++) {
2613 overhead += ext3_bg_has_super(sb, i) +
2614 ext3_bg_num_gdb(sb, i);
2615 cond_resched();
2616 }
2617
2618 /*
2619 * Every block group has an inode bitmap, a block
2620 * bitmap, and an inode table.
2621 */
a71ce8c6
BP		 2622 overhead += ngroups * (2 + sbi->s_itb_per_group);
2623 sbi->s_overhead_last = overhead;
2624 smp_wmb();
2625 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2626 }
2627
2628 buf->f_type = EXT3_SUPER_MAGIC;
2629 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2630 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2631 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
a71ce8c6 2632 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1da177e4
LT		 2633 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2634 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2635 buf->f_bavail = 0;
2636 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2637 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
a71ce8c6 2638 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1da177e4 2639 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2640 fsid = le64_to_cpup((void *)es->s_uuid) ^
2641 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2642 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2643 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2644 return 0;
2645}
2646
2647/* Helper function for writing quotas on sync - we need to start transaction before quota file
2648 * is locked for write. Otherwise the are possible deadlocks:
2649 * Process 1 Process 2
2650 * ext3_create() quota_sync()
2651 * journal_start() write_dquot()
d3be915f
IM		 2652 * DQUOT_INIT() down(dqio_mutex)
2653 * down(dqio_mutex) journal_start()
1da177e4
LT		 2654 *
2655 */
2656
2657#ifdef CONFIG_QUOTA
2658
2659static inline struct inode *dquot_to_inode(struct dquot *dquot)
2660{
2661 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2662}
2663
2664static int ext3_dquot_initialize(struct inode *inode, int type)
2665{
2666 handle_t *handle;
2667 int ret, err;
2668
2669 /* We may create quota structure so we need to reserve enough blocks */
1f54587b 2670 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
1da177e4
LT		 2671 if (IS_ERR(handle))
2672 return PTR_ERR(handle);
2673 ret = dquot_initialize(inode, type);
2674 err = ext3_journal_stop(handle);
2675 if (!ret)
2676 ret = err;
2677 return ret;
2678}
2679
2680static int ext3_dquot_drop(struct inode *inode)
2681{
2682 handle_t *handle;
2683 int ret, err;
2684
2685 /* We may delete quota structure so we need to reserve enough blocks */
1f54587b 2686 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
07c9938a
JK		 2687 if (IS_ERR(handle)) {
2688 /*
2689 * We call dquot_drop() anyway to at least release references
2690 * to quota structures so that umount does not hang.
2691 */
2692 dquot_drop(inode);
1da177e4 2693 return PTR_ERR(handle);
07c9938a 2694 }
1da177e4
LT		 2695 ret = dquot_drop(inode);
2696 err = ext3_journal_stop(handle);
2697 if (!ret)
2698 ret = err;
2699 return ret;
2700}
2701
2702static int ext3_write_dquot(struct dquot *dquot)
2703{
2704 int ret, err;
2705 handle_t *handle;
2706 struct inode *inode;
2707
2708 inode = dquot_to_inode(dquot);
2709 handle = ext3_journal_start(inode,
1f54587b 2710 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2711 if (IS_ERR(handle))
2712 return PTR_ERR(handle);
2713 ret = dquot_commit(dquot);
2714 err = ext3_journal_stop(handle);
2715 if (!ret)
2716 ret = err;
2717 return ret;
2718}
2719
2720static int ext3_acquire_dquot(struct dquot *dquot)
2721{
2722 int ret, err;
2723 handle_t *handle;
2724
2725 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2726 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2727 if (IS_ERR(handle))
2728 return PTR_ERR(handle);
2729 ret = dquot_acquire(dquot);
2730 err = ext3_journal_stop(handle);
2731 if (!ret)
2732 ret = err;
2733 return ret;
2734}
2735
2736static int ext3_release_dquot(struct dquot *dquot)
2737{
2738 int ret, err;
2739 handle_t *handle;
2740
2741 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2742 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2743 if (IS_ERR(handle)) {
2744 /* Release dquot anyway to avoid endless cycle in dqput() */
2745 dquot_release(dquot);
1da177e4 2746 return PTR_ERR(handle);
9c3013e9 2747 }
1da177e4
LT		 2748 ret = dquot_release(dquot);
2749 err = ext3_journal_stop(handle);
2750 if (!ret)
2751 ret = err;
2752 return ret;
2753}
2754
2755static int ext3_mark_dquot_dirty(struct dquot *dquot)
2756{
99aeaf63 2757 /* Are we journaling quotas? */
1da177e4
LT		 2758 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2759 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2760 dquot_mark_dquot_dirty(dquot);
2761 return ext3_write_dquot(dquot);
2762 } else {
2763 return dquot_mark_dquot_dirty(dquot);
2764 }
2765}
2766
2767static int ext3_write_info(struct super_block *sb, int type)
2768{
2769 int ret, err;
2770 handle_t *handle;
2771
2772 /* Data block + inode block */
2773 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2774 if (IS_ERR(handle))
2775 return PTR_ERR(handle);
2776 ret = dquot_commit_info(sb, type);
2777 err = ext3_journal_stop(handle);
2778 if (!ret)
2779 ret = err;
2780 return ret;
2781}
2782
2783/*
2784 * Turn on quotas during mount time - we need to find
2785 * the quota file and such...
2786 */
2787static int ext3_quota_on_mount(struct super_block *sb, int type)
2788{
84de856e
CH		 2789 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2790 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2791}
2792
2793/*
2794 * Standard function to be called on quota_on
2795 */
2796static int ext3_quota_on(struct super_block *sb, int type, int format_id,
8264613d 2797 char *name, int remount)
1da177e4
LT		 2798{
2799 int err;
8264613d 2800 struct path path;
1da177e4 2801
1f54587b
JK		 2802 if (!test_opt(sb, QUOTA))
2803 return -EINVAL;
8264613d 2804 /* When remounting, no checks are needed and in fact, name is NULL */
9cfe7b90 2805 if (remount)
8264613d 2806 return vfs_quota_on(sb, type, format_id, name, remount);
9cfe7b90 2807
8264613d 2808 err = kern_path(name, LOOKUP_FOLLOW, &path);
1da177e4
LT		 2809 if (err)
2810 return err;
9cfe7b90 2811
1da177e4 2812 /* Quotafile not on the same filesystem? */
8264613d
AV		 2813 if (path.mnt->mnt_sb != sb) {
2814 path_put(&path);
1da177e4
LT		 2815 return -EXDEV;
2816 }
9cfe7b90
JK		 2817 /* Journaling quota? */
2818 if (EXT3_SB(sb)->s_qf_names[type]) {
2819 /* Quotafile not of fs root? */
8264613d 2820 if (path.dentry->d_parent != sb->s_root)
9cfe7b90
JK		 2821 printk(KERN_WARNING
2822 "EXT3-fs: Quota file not on filesystem root. "
2823 "Journaled quota will not work.\n");
2824 }
2825
2826 /*
2827 * When we journal data on quota file, we have to flush journal to see
2828 * all updates to the file when we bypass pagecache...
2829 */
8264613d 2830 if (ext3_should_journal_data(path.dentry->d_inode)) {
9cfe7b90
JK		 2831 /*
2832 * We don't need to lock updates but journal_flush() could
2833 * otherwise be livelocked...
2834 */
2835 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2836 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2837 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2d7c820e
HK		 2838 if (err) {
2839 path_put(&nd.path);
2840 return err;
2841 }
9cfe7b90
JK		 2842 }
2843
8264613d
AV		 2844 err = vfs_quota_on_path(sb, type, format_id, &path);
2845 path_put(&path);
77e69dac 2846 return err;
1da177e4
LT		 2847}
2848
2849/* Read data from quotafile - avoid pagecache and such because we cannot afford
2850 * acquiring the locks... As quota files are never truncated and quota code
2851 * itself serializes the operations (and noone else should touch the files)
2852 * we don't have to be afraid of races */
2853static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2854 size_t len, loff_t off)
2855{
2856 struct inode *inode = sb_dqopt(sb)->files[type];
2857 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2858 int err = 0;
2859 int offset = off & (sb->s_blocksize - 1);
2860 int tocopy;
2861 size_t toread;
2862 struct buffer_head *bh;
2863 loff_t i_size = i_size_read(inode);
2864
2865 if (off > i_size)
2866 return 0;
2867 if (off+len > i_size)
2868 len = i_size-off;
2869 toread = len;
2870 while (toread > 0) {
2871 tocopy = sb->s_blocksize - offset < toread ?
2872 sb->s_blocksize - offset : toread;
2873 bh = ext3_bread(NULL, inode, blk, 0, &err);
2874 if (err)
2875 return err;
2876 if (!bh) /* A hole? */
2877 memset(data, 0, tocopy);
2878 else
2879 memcpy(data, bh->b_data+offset, tocopy);
2880 brelse(bh);
2881 offset = 0;
2882 toread -= tocopy;
2883 data += tocopy;
2884 blk++;
2885 }
2886 return len;
2887}
2888
2889/* Write to quotafile (we know the transaction is already started and has
2890 * enough credits) */
2891static ssize_t ext3_quota_write(struct super_block *sb, int type,
2892 const char *data, size_t len, loff_t off)
2893{
2894 struct inode *inode = sb_dqopt(sb)->files[type];
2895 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2896 int err = 0;
2897 int offset = off & (sb->s_blocksize - 1);
2898 int tocopy;
2899 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2900 size_t towrite = len;
2901 struct buffer_head *bh;
2902 handle_t *handle = journal_current_handle();
2903
9c3013e9
JK		 2904 if (!handle) {
2905 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2906 " cancelled because transaction is not started.\n",
2907 (unsigned long long)off, (unsigned long long)len);
2908 return -EIO;
2909 }
5c81a419 2910 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1da177e4
LT		 2911 while (towrite > 0) {
2912 tocopy = sb->s_blocksize - offset < towrite ?
2913 sb->s_blocksize - offset : towrite;
2914 bh = ext3_bread(handle, inode, blk, 1, &err);
2915 if (!bh)
2916 goto out;
2917 if (journal_quota) {
2918 err = ext3_journal_get_write_access(handle, bh);
2919 if (err) {
2920 brelse(bh);
2921 goto out;
2922 }
2923 }
2924 lock_buffer(bh);
2925 memcpy(bh->b_data+offset, data, tocopy);
2926 flush_dcache_page(bh->b_page);
2927 unlock_buffer(bh);
2928 if (journal_quota)
2929 err = ext3_journal_dirty_metadata(handle, bh);
2930 else {
2931 /* Always do at least ordered writes for quotas */
2932 err = ext3_journal_dirty_data(handle, bh);
2933 mark_buffer_dirty(bh);
2934 }
2935 brelse(bh);
2936 if (err)
2937 goto out;
2938 offset = 0;
2939 towrite -= tocopy;
2940 data += tocopy;
2941 blk++;
2942 }
2943out:
f5c8f7da
JK		 2944 if (len == towrite) {
2945 mutex_unlock(&inode->i_mutex);
1da177e4 2946 return err;
f5c8f7da 2947 }
1da177e4
LT		 2948 if (inode->i_size < off+len-towrite) {
2949 i_size_write(inode, off+len-towrite);
2950 EXT3_I(inode)->i_disksize = inode->i_size;
2951 }
2952 inode->i_version++;
2953 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2954 ext3_mark_inode_dirty(handle, inode);
1b1dcc1b 2955 mutex_unlock(&inode->i_mutex);
1da177e4
LT		 2956 return len - towrite;
2957}
2958
2959#endif
2960
454e2398
DH		 2961static int ext3_get_sb(struct file_system_type *fs_type,
2962 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 2963{
454e2398 2964 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
1da177e4
LT		 2965}
2966
2967static struct file_system_type ext3_fs_type = {
2968 .owner = THIS_MODULE,
2969 .name = "ext3",
2970 .get_sb = ext3_get_sb,
2971 .kill_sb = kill_block_super,
2972 .fs_flags = FS_REQUIRES_DEV,
2973};
2974
2975static int __init init_ext3_fs(void)
2976{
2977 int err = init_ext3_xattr();
2978 if (err)
2979 return err;
2980 err = init_inodecache();
2981 if (err)
2982 goto out1;
2983 err = register_filesystem(&ext3_fs_type);
2984 if (err)
2985 goto out;
2986 return 0;
2987out:
2988 destroy_inodecache();
2989out1:
e9ad5620 2990 exit_ext3_xattr();
1da177e4
LT		 2991 return err;
2992}
2993
2994static void __exit exit_ext3_fs(void)
2995{
2996 unregister_filesystem(&ext3_fs_type);
2997 destroy_inodecache();
2998 exit_ext3_xattr();
2999}
3000
3001MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3002MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3003MODULE_LICENSE("GPL");
3004module_init(init_ext3_fs)
3005module_exit(exit_ext3_fs)
Linux 6.x block layer and io_uring tree(s)