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[thirdparty/linux.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>
1da177e4 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
1da177e4
LT		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
8fc2751b 37#include <linux/seq_file.h>
3fc74269 38#include <linux/log2.h>
d71bc6db 39#include <linux/cleancache.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
785c4bcc
LC		 47#define CREATE_TRACE_POINTS
48#include <trace/events/ext3.h>
49
bbae8bcc
LT		 50#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
51 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
52#else
53 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
54#endif
55
71b96257
JL		 56static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
57 unsigned long journal_devnum);
1da177e4 58static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
eee194e7 59 unsigned int);
c4be0c1d
TS		 60static int ext3_commit_super(struct super_block *sb,
61 struct ext3_super_block *es,
1da177e4
LT		 62 int sync);
63static void ext3_mark_recovery_complete(struct super_block * sb,
64 struct ext3_super_block * es);
65static void ext3_clear_journal_err(struct super_block * sb,
66 struct ext3_super_block * es);
67static int ext3_sync_fs(struct super_block *sb, int wait);
68static const char *ext3_decode_error(struct super_block * sb, int errno,
69 char nbuf[16]);
70static int ext3_remount (struct super_block * sb, int * flags, char * data);
726c3342 71static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
c4be0c1d 72static int ext3_unfreeze(struct super_block *sb);
c4be0c1d 73static int ext3_freeze(struct super_block *sb);
1da177e4 74
ae6ddcc5 75/*
1da177e4
LT		 76 * Wrappers for journal_start/end.
77 *
78 * The only special thing we need to do here is to make sure that all
79 * journal_end calls result in the superblock being marked dirty, so
80 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 81 * appropriate.
1da177e4
LT		 82 */
83handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
84{
85 journal_t *journal;
86
87 if (sb->s_flags & MS_RDONLY)
88 return ERR_PTR(-EROFS);
89
90 /* Special case here: if the journal has aborted behind our
91 * backs (eg. EIO in the commit thread), then we still need to
92 * take the FS itself readonly cleanly. */
93 journal = EXT3_SB(sb)->s_journal;
94 if (is_journal_aborted(journal)) {
e05b6b52 95 ext3_abort(sb, __func__,
1da177e4
LT		 96 "Detected aborted journal");
97 return ERR_PTR(-EROFS);
98 }
99
100 return journal_start(journal, nblocks);
101}
102
ae6ddcc5 103/*
1da177e4
LT		 104 * The only special thing we need to do here is to make sure that all
105 * journal_stop calls result in the superblock being marked dirty, so
106 * that sync() will call the filesystem's write_super callback if
ae6ddcc5 107 * appropriate.
1da177e4
LT		 108 */
109int __ext3_journal_stop(const char *where, handle_t *handle)
110{
111 struct super_block *sb;
112 int err;
113 int rc;
114
115 sb = handle->h_transaction->t_journal->j_private;
116 err = handle->h_err;
117 rc = journal_stop(handle);
118
119 if (!err)
120 err = rc;
121 if (err)
122 __ext3_std_error(sb, where, err);
123 return err;
124}
125
126void ext3_journal_abort_handle(const char *caller, const char *err_fn,
127 struct buffer_head *bh, handle_t *handle, int err)
128{
129 char nbuf[16];
130 const char *errstr = ext3_decode_error(NULL, err, nbuf);
131
132 if (bh)
133 BUFFER_TRACE(bh, "abort");
134
135 if (!handle->h_err)
136 handle->h_err = err;
137
138 if (is_handle_aborted(handle))
139 return;
140
4cf46b67
OR		 141 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
142 caller, errstr, err_fn);
1da177e4
LT		 143
144 journal_abort_handle(handle);
145}
146
4cf46b67
OR		 147void ext3_msg(struct super_block *sb, const char *prefix,
148 const char *fmt, ...)
149{
99fbb1e2 150 struct va_format vaf;
4cf46b67
OR		 151 va_list args;
152
153 va_start(args, fmt);
99fbb1e2
JP		 154
155 vaf.fmt = fmt;
156 vaf.va = &args;
157
158 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
159
4cf46b67
OR		 160 va_end(args);
161}
162
1da177e4
LT		 163/* Deal with the reporting of failure conditions on a filesystem such as
164 * inconsistencies detected or read IO failures.
165 *
166 * On ext2, we can store the error state of the filesystem in the
167 * superblock. That is not possible on ext3, because we may have other
168 * write ordering constraints on the superblock which prevent us from
169 * writing it out straight away; and given that the journal is about to
170 * be aborted, we can't rely on the current, or future, transactions to
171 * write out the superblock safely.
172 *
173 * We'll just use the journal_abort() error code to record an error in
d6b198bc 174 * the journal instead. On recovery, the journal will complain about
1da177e4
LT		 175 * that error until we've noted it down and cleared it.
176 */
177
178static void ext3_handle_error(struct super_block *sb)
179{
180 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
181
182 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
183 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
184
185 if (sb->s_flags & MS_RDONLY)
186 return;
187
7543fc7b 188 if (!test_opt (sb, ERRORS_CONT)) {
1da177e4
LT		 189 journal_t *journal = EXT3_SB(sb)->s_journal;
190
e3c96435 191 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
1da177e4
LT		 192 if (journal)
193 journal_abort(journal, -EIO);
194 }
7543fc7b 195 if (test_opt (sb, ERRORS_RO)) {
4cf46b67
OR		 196 ext3_msg(sb, KERN_CRIT,
197 "error: remounting filesystem read-only");
7543fc7b
VA		 198 sb->s_flags |= MS_RDONLY;
199 }
200 ext3_commit_super(sb, es, 1);
1da177e4 201 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 202 panic("EXT3-fs (%s): panic forced after error\n",
1da177e4 203 sb->s_id);
1da177e4
LT		 204}
205
99fbb1e2
JP		 206void ext3_error(struct super_block *sb, const char *function,
207 const char *fmt, ...)
1da177e4 208{
99fbb1e2 209 struct va_format vaf;
1da177e4
LT		 210 va_list args;
211
212 va_start(args, fmt);
99fbb1e2
JP		 213
214 vaf.fmt = fmt;
215 vaf.va = &args;
216
217 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
218 sb->s_id, function, &vaf);
219
1da177e4
LT		 220 va_end(args);
221
222 ext3_handle_error(sb);
223}
224
225static const char *ext3_decode_error(struct super_block * sb, int errno,
226 char nbuf[16])
227{
228 char *errstr = NULL;
229
230 switch (errno) {
231 case -EIO:
232 errstr = "IO failure";
233 break;
234 case -ENOMEM:
235 errstr = "Out of memory";
236 break;
237 case -EROFS:
238 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
239 errstr = "Journal has aborted";
240 else
241 errstr = "Readonly filesystem";
242 break;
243 default:
244 /* If the caller passed in an extra buffer for unknown
245 * errors, textualise them now. Else we just return
246 * NULL. */
247 if (nbuf) {
248 /* Check for truncated error codes... */
249 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
250 errstr = nbuf;
251 }
252 break;
253 }
254
255 return errstr;
256}
257
258/* __ext3_std_error decodes expected errors from journaling functions
259 * automatically and invokes the appropriate error response. */
260
261void __ext3_std_error (struct super_block * sb, const char * function,
262 int errno)
263{
264 char nbuf[16];
30121624 265 const char *errstr;
1da177e4 266
30121624
ST		 267 /* Special case: if the error is EROFS, and we're not already
268 * inside a transaction, then there's really no point in logging
269 * an error. */
270 if (errno == -EROFS && journal_current_handle() == NULL &&
271 (sb->s_flags & MS_RDONLY))
272 return;
273
274 errstr = ext3_decode_error(sb, errno, nbuf);
4cf46b67 275 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
1da177e4
LT		 276
277 ext3_handle_error(sb);
278}
279
280/*
281 * ext3_abort is a much stronger failure handler than ext3_error. The
282 * abort function may be used to deal with unrecoverable failures such
283 * as journal IO errors or ENOMEM at a critical moment in log management.
284 *
285 * We unconditionally force the filesystem into an ABORT|READONLY state,
286 * unless the error response on the fs has been set to panic in which
287 * case we take the easy way out and panic immediately.
288 */
289
99fbb1e2
JP		 290void ext3_abort(struct super_block *sb, const char *function,
291 const char *fmt, ...)
1da177e4 292{
99fbb1e2 293 struct va_format vaf;
1da177e4
LT		 294 va_list args;
295
1da177e4 296 va_start(args, fmt);
99fbb1e2
JP		 297
298 vaf.fmt = fmt;
299 vaf.va = &args;
300
301 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
302 sb->s_id, function, &vaf);
303
1da177e4
LT		 304 va_end(args);
305
306 if (test_opt(sb, ERRORS_PANIC))
4cf46b67 307 panic("EXT3-fs: panic from previous error\n");
1da177e4
LT		 308
309 if (sb->s_flags & MS_RDONLY)
310 return;
311
4cf46b67
OR		 312 ext3_msg(sb, KERN_CRIT,
313 "error: remounting filesystem read-only");
1da177e4
LT		 314 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
315 sb->s_flags |= MS_RDONLY;
e3c96435 316 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
44d6f787
HK		 317 if (EXT3_SB(sb)->s_journal)
318 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
1da177e4
LT		 319}
320
99fbb1e2
JP		 321void ext3_warning(struct super_block *sb, const char *function,
322 const char *fmt, ...)
1da177e4 323{
99fbb1e2 324 struct va_format vaf;
1da177e4
LT		 325 va_list args;
326
327 va_start(args, fmt);
99fbb1e2
JP		 328
329 vaf.fmt = fmt;
330 vaf.va = &args;
331
332 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
333 sb->s_id, function, &vaf);
334
1da177e4
LT		 335 va_end(args);
336}
337
338void ext3_update_dynamic_rev(struct super_block *sb)
339{
340 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
341
342 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
343 return;
344
4cf46b67
OR		 345 ext3_msg(sb, KERN_WARNING,
346 "warning: updating to rev %d because of "
347 "new feature flag, running e2fsck is recommended",
348 EXT3_DYNAMIC_REV);
1da177e4
LT		 349
350 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
351 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
352 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
353 /* leave es->s_feature_*compat flags alone */
354 /* es->s_uuid will be set by e2fsck if empty */
355
356 /*
357 * The rest of the superblock fields should be zero, and if not it
358 * means they are likely already in use, so leave them alone. We
359 * can leave it up to e2fsck to clean up any inconsistencies there.
360 */
361}
362
363/*
364 * Open the external journal device
365 */
4cf46b67 366static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
1da177e4
LT		 367{
368 struct block_device *bdev;
369 char b[BDEVNAME_SIZE];
370
d4d77629 371 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
1da177e4
LT		 372 if (IS_ERR(bdev))
373 goto fail;
374 return bdev;
375
376fail:
4cf46b67
OR		 377 ext3_msg(sb, "error: failed to open journal device %s: %ld",
378 __bdevname(dev, b), PTR_ERR(bdev));
379
1da177e4
LT		 380 return NULL;
381}
382
383/*
384 * Release the journal device
385 */
386static int ext3_blkdev_put(struct block_device *bdev)
387{
e525fd89 388 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
1da177e4
LT		 389}
390
391static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
392{
393 struct block_device *bdev;
394 int ret = -ENODEV;
395
396 bdev = sbi->journal_bdev;
397 if (bdev) {
398 ret = ext3_blkdev_put(bdev);
399 sbi->journal_bdev = NULL;
400 }
401 return ret;
402}
403
404static inline struct inode *orphan_list_entry(struct list_head *l)
405{
406 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
407}
408
409static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
410{
411 struct list_head *l;
412
4cf46b67 413 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
1da177e4
LT		 414 le32_to_cpu(sbi->s_es->s_last_orphan));
415
4cf46b67 416 ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
1da177e4
LT		 417 list_for_each(l, &sbi->s_orphan) {
418 struct inode *inode = orphan_list_entry(l);
4cf46b67 419 ext3_msg(sb, KERN_ERR, " "
eee194e7 420 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1da177e4 421 inode->i_sb->s_id, inode->i_ino, inode,
ae6ddcc5 422 inode->i_mode, inode->i_nlink,
1da177e4
LT		 423 NEXT_ORPHAN(inode));
424 }
425}
426
427static void ext3_put_super (struct super_block * sb)
428{
429 struct ext3_sb_info *sbi = EXT3_SB(sb);
430 struct ext3_super_block *es = sbi->s_es;
44d6f787 431 int i, err;
1da177e4 432
e0ccfd95 433 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
1da177e4 434 ext3_xattr_put_super(sb);
44d6f787
HK		 435 err = journal_destroy(sbi->s_journal);
436 sbi->s_journal = NULL;
437 if (err < 0)
2d7c820e 438 ext3_abort(sb, __func__, "Couldn't clean up the journal");
44d6f787 439
1da177e4
LT		 440 if (!(sb->s_flags & MS_RDONLY)) {
441 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
442 es->s_state = cpu_to_le16(sbi->s_mount_state);
443 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
444 mark_buffer_dirty(sbi->s_sbh);
445 ext3_commit_super(sb, es, 1);
446 }
447
448 for (i = 0; i < sbi->s_gdb_count; i++)
449 brelse(sbi->s_group_desc[i]);
450 kfree(sbi->s_group_desc);
451 percpu_counter_destroy(&sbi->s_freeblocks_counter);
452 percpu_counter_destroy(&sbi->s_freeinodes_counter);
453 percpu_counter_destroy(&sbi->s_dirs_counter);
454 brelse(sbi->s_sbh);
455#ifdef CONFIG_QUOTA
456 for (i = 0; i < MAXQUOTAS; i++)
457 kfree(sbi->s_qf_names[i]);
458#endif
459
460 /* Debugging code just in case the in-memory inode orphan list
461 * isn't empty. The on-disk one can be non-empty if we've
462 * detected an error and taken the fs readonly, but the
463 * in-memory list had better be clean by this point. */
464 if (!list_empty(&sbi->s_orphan))
465 dump_orphan_list(sb, sbi);
466 J_ASSERT(list_empty(&sbi->s_orphan));
467
f98393a6 468 invalidate_bdev(sb->s_bdev);
1da177e4
LT		 469 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
470 /*
471 * Invalidate the journal device's buffers. We don't want them
472 * floating about in memory - the physical journal device may
473 * hotswapped, and it breaks the `ro-after' testing code.
474 */
475 sync_blockdev(sbi->journal_bdev);
f98393a6 476 invalidate_bdev(sbi->journal_bdev);
1da177e4
LT		 477 ext3_blkdev_remove(sbi);
478 }
479 sb->s_fs_info = NULL;
5df096d6 480 kfree(sbi->s_blockgroup_lock);
1da177e4 481 kfree(sbi);
1da177e4
LT		 482}
483
e18b890b 484static struct kmem_cache *ext3_inode_cachep;
1da177e4
LT		 485
486/*
487 * Called inside transaction, so use GFP_NOFS
488 */
489static struct inode *ext3_alloc_inode(struct super_block *sb)
490{
491 struct ext3_inode_info *ei;
492
e6b4f8da 493 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
1da177e4
LT		 494 if (!ei)
495 return NULL;
1da177e4
LT		 496 ei->i_block_alloc_info = NULL;
497 ei->vfs_inode.i_version = 1;
fe8bc91c
JK		 498 atomic_set(&ei->i_datasync_tid, 0);
499 atomic_set(&ei->i_sync_tid, 0);
1da177e4
LT		 500 return &ei->vfs_inode;
501}
502
785c4bcc
LC		 503static int ext3_drop_inode(struct inode *inode)
504{
505 int drop = generic_drop_inode(inode);
506
507 trace_ext3_drop_inode(inode, drop);
508 return drop;
509}
510
fa0d7e3d
NP		 511static void ext3_i_callback(struct rcu_head *head)
512{
513 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 514 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
515}
516
1da177e4
LT		 517static void ext3_destroy_inode(struct inode *inode)
518{
9f7dd93d
VA		 519 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
520 printk("EXT3 Inode %p: orphan list check failed!\n",
521 EXT3_I(inode));
522 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
523 EXT3_I(inode), sizeof(struct ext3_inode_info),
524 false);
525 dump_stack();
526 }
fa0d7e3d 527 call_rcu(&inode->i_rcu, ext3_i_callback);
1da177e4
LT		 528}
529
51cc5068 530static void init_once(void *foo)
1da177e4
LT		 531{
532 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
533
a35afb83 534 INIT_LIST_HEAD(&ei->i_orphan);
1da177e4 535#ifdef CONFIG_EXT3_FS_XATTR
a35afb83 536 init_rwsem(&ei->xattr_sem);
1da177e4 537#endif
a35afb83
CL		 538 mutex_init(&ei->truncate_mutex);
539 inode_init_once(&ei->vfs_inode);
1da177e4 540}
ae6ddcc5 541
1da177e4
LT		 542static int init_inodecache(void)
543{
544 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
545 sizeof(struct ext3_inode_info),
fffb60f9
PJ		 546 0, (SLAB_RECLAIM_ACCOUNT|
547 SLAB_MEM_SPREAD),
20c2df83 548 init_once);
1da177e4
LT		 549 if (ext3_inode_cachep == NULL)
550 return -ENOMEM;
551 return 0;
552}
553
554static void destroy_inodecache(void)
555{
1a1d92c1 556 kmem_cache_destroy(ext3_inode_cachep);
1da177e4
LT		 557}
558
6cd37cda 559static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
8fc2751b 560{
6cd37cda 561#if defined(CONFIG_QUOTA)
275abf5b 562 struct ext3_sb_info *sbi = EXT3_SB(sb);
8fc2751b 563
1aeec434
JK		 564 if (sbi->s_jquota_fmt) {
565 char *fmtname = "";
566
567 switch (sbi->s_jquota_fmt) {
568 case QFMT_VFS_OLD:
569 fmtname = "vfsold";
570 break;
571 case QFMT_VFS_V0:
572 fmtname = "vfsv0";
573 break;
574 case QFMT_VFS_V1:
575 fmtname = "vfsv1";
576 break;
577 }
578 seq_printf(seq, ",jqfmt=%s", fmtname);
579 }
8fc2751b
MB		 580
581 if (sbi->s_qf_names[USRQUOTA])
582 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
583
584 if (sbi->s_qf_names[GRPQUOTA])
585 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
586
e3c96435 587 if (test_opt(sb, USRQUOTA))
8fc2751b
MB		 588 seq_puts(seq, ",usrquota");
589
e3c96435 590 if (test_opt(sb, GRPQUOTA))
8fc2751b
MB		 591 seq_puts(seq, ",grpquota");
592#endif
6cd37cda
PO		 593}
594
3c4cec65
JK		 595static char *data_mode_string(unsigned long mode)
596{
597 switch (mode) {
598 case EXT3_MOUNT_JOURNAL_DATA:
599 return "journal";
600 case EXT3_MOUNT_ORDERED_DATA:
601 return "ordered";
602 case EXT3_MOUNT_WRITEBACK_DATA:
603 return "writeback";
604 }
605 return "unknown";
606}
607
571beed8
MS		 608/*
609 * Show an option if
610 * - it's set to a non-default value OR
611 * - if the per-sb default is different from the global default
612 */
34c80b1d 613static int ext3_show_options(struct seq_file *seq, struct dentry *root)
6cd37cda 614{
34c80b1d 615 struct super_block *sb = root->d_sb;
571beed8
MS		 616 struct ext3_sb_info *sbi = EXT3_SB(sb);
617 struct ext3_super_block *es = sbi->s_es;
618 unsigned long def_mount_opts;
619
620 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
621
622 if (sbi->s_sb_block != 1)
623 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
624 if (test_opt(sb, MINIX_DF))
625 seq_puts(seq, ",minixdf");
626 if (test_opt(sb, GRPID))
627 seq_puts(seq, ",grpid");
628 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
629 seq_puts(seq, ",nogrpid");
630 if (sbi->s_resuid != EXT3_DEF_RESUID ||
631 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
632 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
633 }
634 if (sbi->s_resgid != EXT3_DEF_RESGID ||
635 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
636 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
637 }
1eca93f9 638 if (test_opt(sb, ERRORS_RO)) {
571beed8
MS		 639 int def_errors = le16_to_cpu(es->s_errors);
640
641 if (def_errors == EXT3_ERRORS_PANIC ||
1eca93f9
AK		 642 def_errors == EXT3_ERRORS_CONTINUE) {
643 seq_puts(seq, ",errors=remount-ro");
571beed8
MS		 644 }
645 }
1eca93f9
AK		 646 if (test_opt(sb, ERRORS_CONT))
647 seq_puts(seq, ",errors=continue");
571beed8
MS		 648 if (test_opt(sb, ERRORS_PANIC))
649 seq_puts(seq, ",errors=panic");
650 if (test_opt(sb, NO_UID32))
651 seq_puts(seq, ",nouid32");
652 if (test_opt(sb, DEBUG))
653 seq_puts(seq, ",debug");
571beed8
MS		 654#ifdef CONFIG_EXT3_FS_XATTR
655 if (test_opt(sb, XATTR_USER))
656 seq_puts(seq, ",user_xattr");
657 if (!test_opt(sb, XATTR_USER) &&
658 (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
659 seq_puts(seq, ",nouser_xattr");
660 }
661#endif
662#ifdef CONFIG_EXT3_FS_POSIX_ACL
663 if (test_opt(sb, POSIX_ACL))
664 seq_puts(seq, ",acl");
665 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
666 seq_puts(seq, ",noacl");
667#endif
668 if (!test_opt(sb, RESERVATION))
669 seq_puts(seq, ",noreservation");
670 if (sbi->s_commit_interval) {
671 seq_printf(seq, ",commit=%u",
672 (unsigned) (sbi->s_commit_interval / HZ));
673 }
0636c73e
ES		 674
675 /*
676 * Always display barrier state so it's clear what the status is.
677 */
678 seq_puts(seq, ",barrier=");
679 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
e3c96435 680 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
0e4fb5e2
HK		 681 if (test_opt(sb, DATA_ERR_ABORT))
682 seq_puts(seq, ",data_err=abort");
683
dee1d3b6
ES		 684 if (test_opt(sb, NOLOAD))
685 seq_puts(seq, ",norecovery");
686
6cd37cda 687 ext3_show_quota_options(seq, sb);
8fc2751b
MB		 688
689 return 0;
690}
1da177e4 691
fdb36673 692
74af0baa
CH		 693static struct inode *ext3_nfs_get_inode(struct super_block *sb,
694 u64 ino, u32 generation)
fdb36673 695{
fdb36673 696 struct inode *inode;
fdb36673
N		 697
698 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
699 return ERR_PTR(-ESTALE);
700 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
701 return ERR_PTR(-ESTALE);
702
703 /* iget isn't really right if the inode is currently unallocated!!
704 *
705 * ext3_read_inode will return a bad_inode if the inode had been
706 * deleted, so we should be safe.
707 *
708 * Currently we don't know the generation for parent directory, so
709 * a generation of 0 means "accept any"
710 */
473043dc
DH		 711 inode = ext3_iget(sb, ino);
712 if (IS_ERR(inode))
713 return ERR_CAST(inode);
714 if (generation && inode->i_generation != generation) {
fdb36673
N		 715 iput(inode);
716 return ERR_PTR(-ESTALE);
717 }
74af0baa
CH		 718
719 return inode;
720}
721
722static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
723 int fh_len, int fh_type)
724{
725 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
726 ext3_nfs_get_inode);
727}
728
729static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
730 int fh_len, int fh_type)
731{
732 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
733 ext3_nfs_get_inode);
fdb36673
N		 734}
735
6b082b53
TO		 736/*
737 * Try to release metadata pages (indirect blocks, directories) which are
738 * mapped via the block device. Since these pages could have journal heads
739 * which would prevent try_to_free_buffers() from freeing them, we must use
740 * jbd layer's try_to_free_buffers() function to release them.
741 */
742static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
743 gfp_t wait)
744{
745 journal_t *journal = EXT3_SB(sb)->s_journal;
746
747 WARN_ON(PageChecked(page));
748 if (!page_has_buffers(page))
749 return 0;
750 if (journal)
751 return journal_try_to_free_buffers(journal, page,
752 wait & ~__GFP_WAIT);
753 return try_to_free_buffers(page);
754}
755
8fc2751b 756#ifdef CONFIG_QUOTA
1da177e4
LT		 757#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
758#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
759
1da177e4
LT		 760static int ext3_write_dquot(struct dquot *dquot);
761static int ext3_acquire_dquot(struct dquot *dquot);
762static int ext3_release_dquot(struct dquot *dquot);
763static int ext3_mark_dquot_dirty(struct dquot *dquot);
764static int ext3_write_info(struct super_block *sb, int type);
2fd83a4f 765static int ext3_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 766 struct path *path);
1da177e4
LT		 767static int ext3_quota_on_mount(struct super_block *sb, int type);
768static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
769 size_t len, loff_t off);
770static ssize_t ext3_quota_write(struct super_block *sb, int type,
771 const char *data, size_t len, loff_t off);
772
61e225dc 773static const struct dquot_operations ext3_quota_operations = {
1da177e4
LT		 774 .write_dquot = ext3_write_dquot,
775 .acquire_dquot = ext3_acquire_dquot,
776 .release_dquot = ext3_release_dquot,
777 .mark_dirty = ext3_mark_dquot_dirty,
157091a2
JK		 778 .write_info = ext3_write_info,
779 .alloc_dquot = dquot_alloc,
780 .destroy_dquot = dquot_destroy,
1da177e4
LT		 781};
782
0d54b217 783static const struct quotactl_ops ext3_qctl_operations = {
1da177e4 784 .quota_on = ext3_quota_on,
287a8095
CH		 785 .quota_off = dquot_quota_off,
786 .quota_sync = dquot_quota_sync,
787 .get_info = dquot_get_dqinfo,
788 .set_info = dquot_set_dqinfo,
789 .get_dqblk = dquot_get_dqblk,
790 .set_dqblk = dquot_set_dqblk
1da177e4
LT		 791};
792#endif
793
ee9b6d61 794static const struct super_operations ext3_sops = {
1da177e4
LT		 795 .alloc_inode = ext3_alloc_inode,
796 .destroy_inode = ext3_destroy_inode,
1da177e4
LT		 797 .write_inode = ext3_write_inode,
798 .dirty_inode = ext3_dirty_inode,
785c4bcc 799 .drop_inode = ext3_drop_inode,
ac14a95b 800 .evict_inode = ext3_evict_inode,
1da177e4 801 .put_super = ext3_put_super,
1da177e4 802 .sync_fs = ext3_sync_fs,
c4be0c1d
TS		 803 .freeze_fs = ext3_freeze,
804 .unfreeze_fs = ext3_unfreeze,
1da177e4
LT		 805 .statfs = ext3_statfs,
806 .remount_fs = ext3_remount,
8fc2751b 807 .show_options = ext3_show_options,
1da177e4
LT		 808#ifdef CONFIG_QUOTA
809 .quota_read = ext3_quota_read,
810 .quota_write = ext3_quota_write,
811#endif
6b082b53 812 .bdev_try_to_free_page = bdev_try_to_free_page,
1da177e4
LT		 813};
814
39655164 815static const struct export_operations ext3_export_ops = {
74af0baa
CH		 816 .fh_to_dentry = ext3_fh_to_dentry,
817 .fh_to_parent = ext3_fh_to_parent,
1da177e4
LT		 818 .get_parent = ext3_get_parent,
819};
820
821enum {
822 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
823 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
2860b733 824 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
1da177e4 825 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
ade1a29e 826 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
71b96257 827 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
1da177e4 828 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
0e4fb5e2 829 Opt_data_err_abort, Opt_data_err_ignore,
1da177e4 830 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1aeec434 831 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
0636c73e
ES		 832 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
833 Opt_resize, Opt_usrquota, Opt_grpquota
1da177e4
LT		 834};
835
a447c093 836static const match_table_t tokens = {
1da177e4
LT		 837 {Opt_bsd_df, "bsddf"},
838 {Opt_minix_df, "minixdf"},
839 {Opt_grpid, "grpid"},
840 {Opt_grpid, "bsdgroups"},
841 {Opt_nogrpid, "nogrpid"},
842 {Opt_nogrpid, "sysvgroups"},
843 {Opt_resgid, "resgid=%u"},
844 {Opt_resuid, "resuid=%u"},
845 {Opt_sb, "sb=%u"},
846 {Opt_err_cont, "errors=continue"},
847 {Opt_err_panic, "errors=panic"},
848 {Opt_err_ro, "errors=remount-ro"},
849 {Opt_nouid32, "nouid32"},
850 {Opt_nocheck, "nocheck"},
851 {Opt_nocheck, "check=none"},
1da177e4
LT		 852 {Opt_debug, "debug"},
853 {Opt_oldalloc, "oldalloc"},
854 {Opt_orlov, "orlov"},
855 {Opt_user_xattr, "user_xattr"},
856 {Opt_nouser_xattr, "nouser_xattr"},
857 {Opt_acl, "acl"},
858 {Opt_noacl, "noacl"},
859 {Opt_reservation, "reservation"},
860 {Opt_noreservation, "noreservation"},
861 {Opt_noload, "noload"},
dee1d3b6 862 {Opt_noload, "norecovery"},
1da177e4 863 {Opt_nobh, "nobh"},
ade1a29e 864 {Opt_bh, "bh"},
1da177e4
LT		 865 {Opt_commit, "commit=%u"},
866 {Opt_journal_update, "journal=update"},
867 {Opt_journal_inum, "journal=%u"},
71b96257 868 {Opt_journal_dev, "journal_dev=%u"},
1da177e4
LT		 869 {Opt_abort, "abort"},
870 {Opt_data_journal, "data=journal"},
871 {Opt_data_ordered, "data=ordered"},
872 {Opt_data_writeback, "data=writeback"},
0e4fb5e2
HK		 873 {Opt_data_err_abort, "data_err=abort"},
874 {Opt_data_err_ignore, "data_err=ignore"},
1da177e4
LT		 875 {Opt_offusrjquota, "usrjquota="},
876 {Opt_usrjquota, "usrjquota=%s"},
877 {Opt_offgrpjquota, "grpjquota="},
878 {Opt_grpjquota, "grpjquota=%s"},
879 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
880 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1aeec434 881 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
8fc2751b 882 {Opt_grpquota, "grpquota"},
1f54587b
JK		 883 {Opt_noquota, "noquota"},
884 {Opt_quota, "quota"},
8fc2751b 885 {Opt_usrquota, "usrquota"},
1da177e4 886 {Opt_barrier, "barrier=%u"},
0636c73e
ES		 887 {Opt_barrier, "barrier"},
888 {Opt_nobarrier, "nobarrier"},
1da177e4 889 {Opt_resize, "resize"},
92587216 890 {Opt_err, NULL},
1da177e4
LT		 891};
892
4cf46b67 893static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
1da177e4 894{
e9ad5620
DK		 895 ext3_fsblk_t sb_block;
896 char *options = (char *) *data;
1da177e4
LT		 897
898 if (!options || strncmp(options, "sb=", 3) != 0)
899 return 1; /* Default location */
900 options += 3;
43d23f90 901 /*todo: use simple_strtoll with >32bit ext3 */
1da177e4
LT		 902 sb_block = simple_strtoul(options, &options, 0);
903 if (*options && *options != ',') {
4cf46b67 904 ext3_msg(sb, "error: invalid sb specification: %s",
1da177e4
LT		 905 (char *) *data);
906 return 1;
907 }
908 if (*options == ',')
909 options++;
910 *data = (void *) options;
911 return sb_block;
912}
913
e1f5c67a
DM		 914#ifdef CONFIG_QUOTA
915static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
916{
917 struct ext3_sb_info *sbi = EXT3_SB(sb);
918 char *qname;
919
920 if (sb_any_quota_loaded(sb) &&
921 !sbi->s_qf_names[qtype]) {
922 ext3_msg(sb, KERN_ERR,
923 "Cannot change journaled "
924 "quota options when quota turned on");
925 return 0;
926 }
927 qname = match_strdup(args);
928 if (!qname) {
929 ext3_msg(sb, KERN_ERR,
930 "Not enough memory for storing quotafile name");
931 return 0;
932 }
933 if (sbi->s_qf_names[qtype] &&
934 strcmp(sbi->s_qf_names[qtype], qname)) {
935 ext3_msg(sb, KERN_ERR,
936 "%s quota file already specified", QTYPE2NAME(qtype));
937 kfree(qname);
938 return 0;
939 }
940 sbi->s_qf_names[qtype] = qname;
941 if (strchr(sbi->s_qf_names[qtype], '/')) {
942 ext3_msg(sb, KERN_ERR,
943 "quotafile must be on filesystem root");
944 kfree(sbi->s_qf_names[qtype]);
945 sbi->s_qf_names[qtype] = NULL;
946 return 0;
947 }
948 set_opt(sbi->s_mount_opt, QUOTA);
949 return 1;
950}
951
952static int clear_qf_name(struct super_block *sb, int qtype) {
953
954 struct ext3_sb_info *sbi = EXT3_SB(sb);
955
956 if (sb_any_quota_loaded(sb) &&
957 sbi->s_qf_names[qtype]) {
958 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
959 " when quota turned on");
960 return 0;
961 }
962 /*
963 * The space will be released later when all options are confirmed
964 * to be correct
965 */
966 sbi->s_qf_names[qtype] = NULL;
967 return 1;
968}
969#endif
970
71b96257 971static int parse_options (char *options, struct super_block *sb,
eee194e7 972 unsigned int *inum, unsigned long *journal_devnum,
43d23f90 973 ext3_fsblk_t *n_blocks_count, int is_remount)
1da177e4
LT		 974{
975 struct ext3_sb_info *sbi = EXT3_SB(sb);
976 char * p;
977 substring_t args[MAX_OPT_ARGS];
978 int data_opt = 0;
979 int option;
980#ifdef CONFIG_QUOTA
e1f5c67a 981 int qfmt;
1da177e4
LT		 982#endif
983
984 if (!options)
985 return 1;
986
987 while ((p = strsep (&options, ",")) != NULL) {
988 int token;
989 if (!*p)
990 continue;
0636c73e
ES		 991 /*
992 * Initialize args struct so we know whether arg was
993 * found; some options take optional arguments.
994 */
995 args[0].to = args[0].from = 0;
1da177e4
LT		 996 token = match_token(p, tokens, args);
997 switch (token) {
998 case Opt_bsd_df:
999 clear_opt (sbi->s_mount_opt, MINIX_DF);
1000 break;
1001 case Opt_minix_df:
1002 set_opt (sbi->s_mount_opt, MINIX_DF);
1003 break;
1004 case Opt_grpid:
1005 set_opt (sbi->s_mount_opt, GRPID);
1006 break;
1007 case Opt_nogrpid:
1008 clear_opt (sbi->s_mount_opt, GRPID);
1009 break;
1010 case Opt_resuid:
1011 if (match_int(&args[0], &option))
1012 return 0;
1013 sbi->s_resuid = option;
1014 break;
1015 case Opt_resgid:
1016 if (match_int(&args[0], &option))
1017 return 0;
1018 sbi->s_resgid = option;
1019 break;
1020 case Opt_sb:
1021 /* handled by get_sb_block() instead of here */
1022 /* *sb_block = match_int(&args[0]); */
1023 break;
1024 case Opt_err_panic:
1025 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1026 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1027 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1028 break;
1029 case Opt_err_ro:
1030 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1031 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1032 set_opt (sbi->s_mount_opt, ERRORS_RO);
1033 break;
1034 case Opt_err_cont:
1035 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1036 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1037 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1038 break;
1039 case Opt_nouid32:
1040 set_opt (sbi->s_mount_opt, NO_UID32);
1041 break;
1da177e4
LT		 1042 case Opt_nocheck:
1043 clear_opt (sbi->s_mount_opt, CHECK);
1044 break;
1045 case Opt_debug:
1046 set_opt (sbi->s_mount_opt, DEBUG);
1047 break;
1048 case Opt_oldalloc:
fbc85402
LC		 1049 ext3_msg(sb, KERN_WARNING,
1050 "Ignoring deprecated oldalloc option");
1da177e4
LT		 1051 break;
1052 case Opt_orlov:
fbc85402
LC		 1053 ext3_msg(sb, KERN_WARNING,
1054 "Ignoring deprecated orlov option");
1da177e4
LT		 1055 break;
1056#ifdef CONFIG_EXT3_FS_XATTR
1057 case Opt_user_xattr:
1058 set_opt (sbi->s_mount_opt, XATTR_USER);
1059 break;
1060 case Opt_nouser_xattr:
1061 clear_opt (sbi->s_mount_opt, XATTR_USER);
1062 break;
1063#else
1064 case Opt_user_xattr:
1065 case Opt_nouser_xattr:
4cf46b67
OR		 1066 ext3_msg(sb, KERN_INFO,
1067 "(no)user_xattr options not supported");
1da177e4
LT		 1068 break;
1069#endif
1070#ifdef CONFIG_EXT3_FS_POSIX_ACL
1071 case Opt_acl:
1072 set_opt(sbi->s_mount_opt, POSIX_ACL);
1073 break;
1074 case Opt_noacl:
1075 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1076 break;
1077#else
1078 case Opt_acl:
1079 case Opt_noacl:
4cf46b67
OR		 1080 ext3_msg(sb, KERN_INFO,
1081 "(no)acl options not supported");
1da177e4
LT		 1082 break;
1083#endif
1084 case Opt_reservation:
1085 set_opt(sbi->s_mount_opt, RESERVATION);
1086 break;
1087 case Opt_noreservation:
1088 clear_opt(sbi->s_mount_opt, RESERVATION);
1089 break;
1090 case Opt_journal_update:
1091 /* @@@ FIXME */
1092 /* Eventually we will want to be able to create
1093 a journal file here. For now, only allow the
1094 user to specify an existing inode to be the
1095 journal file. */
1096 if (is_remount) {
4cf46b67
OR		 1097 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1098 "journal on remount");
1da177e4
LT		 1099 return 0;
1100 }
1101 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1102 break;
1103 case Opt_journal_inum:
1104 if (is_remount) {
4cf46b67
OR		 1105 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1106 "journal on remount");
1da177e4
LT		 1107 return 0;
1108 }
1109 if (match_int(&args[0], &option))
1110 return 0;
1111 *inum = option;
1112 break;
71b96257
JL		 1113 case Opt_journal_dev:
1114 if (is_remount) {
4cf46b67
OR		 1115 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1116 "journal on remount");
71b96257
JL		 1117 return 0;
1118 }
1119 if (match_int(&args[0], &option))
1120 return 0;
1121 *journal_devnum = option;
1122 break;
1da177e4
LT		 1123 case Opt_noload:
1124 set_opt (sbi->s_mount_opt, NOLOAD);
1125 break;
1126 case Opt_commit:
1127 if (match_int(&args[0], &option))
1128 return 0;
1129 if (option < 0)
1130 return 0;
1131 if (option == 0)
1132 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1133 sbi->s_commit_interval = HZ * option;
1134 break;
1135 case Opt_data_journal:
1136 data_opt = EXT3_MOUNT_JOURNAL_DATA;
1137 goto datacheck;
1138 case Opt_data_ordered:
1139 data_opt = EXT3_MOUNT_ORDERED_DATA;
1140 goto datacheck;
1141 case Opt_data_writeback:
1142 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1143 datacheck:
1144 if (is_remount) {
e3c96435 1145 if (test_opt(sb, DATA_FLAGS) == data_opt)
3c4cec65 1146 break;
4cf46b67
OR		 1147 ext3_msg(sb, KERN_ERR,
1148 "error: cannot change "
3c4cec65
JK		 1149 "data mode on remount. The filesystem "
1150 "is mounted in data=%s mode and you "
4cf46b67 1151 "try to remount it in data=%s mode.",
e3c96435
DM		 1152 data_mode_string(test_opt(sb,
1153 DATA_FLAGS)),
3c4cec65
JK		 1154 data_mode_string(data_opt));
1155 return 0;
1da177e4 1156 } else {
e3c96435 1157 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1da177e4
LT		 1158 sbi->s_mount_opt |= data_opt;
1159 }
1160 break;
0e4fb5e2
HK		 1161 case Opt_data_err_abort:
1162 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1163 break;
1164 case Opt_data_err_ignore:
1165 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1166 break;
1da177e4
LT		 1167#ifdef CONFIG_QUOTA
1168 case Opt_usrjquota:
e1f5c67a 1169 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1da177e4 1170 return 0;
e1f5c67a
DM		 1171 break;
1172 case Opt_grpjquota:
1173 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1da177e4 1174 return 0;
1da177e4
LT		 1175 break;
1176 case Opt_offusrjquota:
e1f5c67a
DM		 1177 if (!clear_qf_name(sb, USRQUOTA))
1178 return 0;
1179 break;
1da177e4 1180 case Opt_offgrpjquota:
e1f5c67a 1181 if (!clear_qf_name(sb, GRPQUOTA))
1da177e4 1182 return 0;
1da177e4
LT		 1183 break;
1184 case Opt_jqfmt_vfsold:
d06bf1d2
JK		 1185 qfmt = QFMT_VFS_OLD;
1186 goto set_qf_format;
1da177e4 1187 case Opt_jqfmt_vfsv0:
d06bf1d2 1188 qfmt = QFMT_VFS_V0;
1aeec434
JK		 1189 goto set_qf_format;
1190 case Opt_jqfmt_vfsv1:
1191 qfmt = QFMT_VFS_V1;
d06bf1d2 1192set_qf_format:
ee0d5ffe 1193 if (sb_any_quota_loaded(sb) &&
d06bf1d2 1194 sbi->s_jquota_fmt != qfmt) {
4cf46b67 1195 ext3_msg(sb, KERN_ERR, "error: cannot change "
d06bf1d2 1196 "journaled quota options when "
4cf46b67 1197 "quota turned on.");
d06bf1d2
JK		 1198 return 0;
1199 }
1200 sbi->s_jquota_fmt = qfmt;
1da177e4 1201 break;
1f54587b 1202 case Opt_quota:
8fc2751b
MB		 1203 case Opt_usrquota:
1204 set_opt(sbi->s_mount_opt, QUOTA);
1205 set_opt(sbi->s_mount_opt, USRQUOTA);
1206 break;
1207 case Opt_grpquota:
1f54587b 1208 set_opt(sbi->s_mount_opt, QUOTA);
8fc2751b 1209 set_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b
JK		 1210 break;
1211 case Opt_noquota:
ee0d5ffe 1212 if (sb_any_quota_loaded(sb)) {
4cf46b67
OR		 1213 ext3_msg(sb, KERN_ERR, "error: cannot change "
1214 "quota options when quota turned on.");
1f54587b
JK		 1215 return 0;
1216 }
1217 clear_opt(sbi->s_mount_opt, QUOTA);
8fc2751b
MB		 1218 clear_opt(sbi->s_mount_opt, USRQUOTA);
1219 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1f54587b 1220 break;
1da177e4 1221#else
8fc2751b
MB		 1222 case Opt_quota:
1223 case Opt_usrquota:
1224 case Opt_grpquota:
4cf46b67
OR		 1225 ext3_msg(sb, KERN_ERR,
1226 "error: quota options not supported.");
fa1ff1e0 1227 break;
1da177e4
LT		 1228 case Opt_usrjquota:
1229 case Opt_grpjquota:
1230 case Opt_offusrjquota:
1231 case Opt_offgrpjquota:
1232 case Opt_jqfmt_vfsold:
1233 case Opt_jqfmt_vfsv0:
1aeec434 1234 case Opt_jqfmt_vfsv1:
4cf46b67
OR		 1235 ext3_msg(sb, KERN_ERR,
1236 "error: journaled quota options not "
1237 "supported.");
1da177e4 1238 break;
1f54587b
JK		 1239 case Opt_noquota:
1240 break;
1da177e4
LT		 1241#endif
1242 case Opt_abort:
1243 set_opt(sbi->s_mount_opt, ABORT);
1244 break;
0636c73e
ES		 1245 case Opt_nobarrier:
1246 clear_opt(sbi->s_mount_opt, BARRIER);
1247 break;
1da177e4 1248 case Opt_barrier:
0636c73e
ES		 1249 if (args[0].from) {
1250 if (match_int(&args[0], &option))
1251 return 0;
1252 } else
1253 option = 1; /* No argument, default to 1 */
1da177e4
LT		 1254 if (option)
1255 set_opt(sbi->s_mount_opt, BARRIER);
1256 else
1257 clear_opt(sbi->s_mount_opt, BARRIER);
1258 break;
1259 case Opt_ignore:
1260 break;
1261 case Opt_resize:
08c6a96f 1262 if (!is_remount) {
4cf46b67
OR		 1263 ext3_msg(sb, KERN_ERR,
1264 "error: resize option only available "
1265 "for remount");
1da177e4
LT		 1266 return 0;
1267 }
c7f1721e
KZ		 1268 if (match_int(&args[0], &option) != 0)
1269 return 0;
1da177e4
LT		 1270 *n_blocks_count = option;
1271 break;
1272 case Opt_nobh:
4c4d3901
CH		 1273 ext3_msg(sb, KERN_WARNING,
1274 "warning: ignoring deprecated nobh option");
1da177e4 1275 break;
ade1a29e 1276 case Opt_bh:
4c4d3901
CH		 1277 ext3_msg(sb, KERN_WARNING,
1278 "warning: ignoring deprecated bh option");
ade1a29e 1279 break;
1da177e4 1280 default:
4cf46b67
OR		 1281 ext3_msg(sb, KERN_ERR,
1282 "error: unrecognized mount option \"%s\" "
1283 "or missing value", p);
1da177e4
LT		 1284 return 0;
1285 }
1286 }
1287#ifdef CONFIG_QUOTA
8fc2751b 1288 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
e3c96435 1289 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
8fc2751b 1290 clear_opt(sbi->s_mount_opt, USRQUOTA);
e3c96435 1291 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
8fc2751b
MB		 1292 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1293
e1f5c67a 1294 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
4cf46b67
OR		 1295 ext3_msg(sb, KERN_ERR, "error: old and new quota "
1296 "format mixing.");
8fc2751b
MB		 1297 return 0;
1298 }
1299
1300 if (!sbi->s_jquota_fmt) {
4cf46b67
OR		 1301 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1302 "not specified.");
8fc2751b
MB		 1303 return 0;
1304 }
1305 } else {
1306 if (sbi->s_jquota_fmt) {
4cf46b67 1307 ext3_msg(sb, KERN_ERR, "error: journaled quota format "
99aeaf63 1308 "specified with no journaling "
4cf46b67 1309 "enabled.");
8fc2751b
MB		 1310 return 0;
1311 }
1da177e4
LT		 1312 }
1313#endif
1da177e4
LT		 1314 return 1;
1315}
1316
1317static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1318 int read_only)
1319{
1320 struct ext3_sb_info *sbi = EXT3_SB(sb);
1321 int res = 0;
1322
1323 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
4cf46b67
OR		 1324 ext3_msg(sb, KERN_ERR,
1325 "error: revision level too high, "
1326 "forcing read-only mode");
1da177e4
LT		 1327 res = MS_RDONLY;
1328 }
1329 if (read_only)
1330 return res;
1331 if (!(sbi->s_mount_state & EXT3_VALID_FS))
4cf46b67
OR		 1332 ext3_msg(sb, KERN_WARNING,
1333 "warning: mounting unchecked fs, "
1334 "running e2fsck is recommended");
1da177e4 1335 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
4cf46b67
OR		 1336 ext3_msg(sb, KERN_WARNING,
1337 "warning: mounting fs with errors, "
1338 "running e2fsck is recommended");
df0d6b8f 1339 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1da177e4 1340 le16_to_cpu(es->s_mnt_count) >=
df0d6b8f 1341 le16_to_cpu(es->s_max_mnt_count))
4cf46b67
OR		 1342 ext3_msg(sb, KERN_WARNING,
1343 "warning: maximal mount count reached, "
1344 "running e2fsck is recommended");
1da177e4
LT		 1345 else if (le32_to_cpu(es->s_checkinterval) &&
1346 (le32_to_cpu(es->s_lastcheck) +
1347 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
4cf46b67
OR		 1348 ext3_msg(sb, KERN_WARNING,
1349 "warning: checktime reached, "
1350 "running e2fsck is recommended");
1da177e4
LT		 1351#if 0
1352 /* @@@ We _will_ want to clear the valid bit if we find
1353 inconsistencies, to force a fsck at reboot. But for
1354 a plain journaled filesystem we can keep it set as
1355 valid forever! :) */
e7f23ebd 1356 es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1da177e4 1357#endif
df0d6b8f 1358 if (!le16_to_cpu(es->s_max_mnt_count))
1da177e4 1359 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
50e8a289 1360 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 1361 es->s_mtime = cpu_to_le32(get_seconds());
1362 ext3_update_dynamic_rev(sb);
1363 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1364
1365 ext3_commit_super(sb, es, 1);
1366 if (test_opt(sb, DEBUG))
4cf46b67
OR		 1367 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1368 "bpg=%lu, ipg=%lu, mo=%04lx]",
1da177e4
LT		 1369 sb->s_blocksize,
1370 sbi->s_groups_count,
1371 EXT3_BLOCKS_PER_GROUP(sb),
1372 EXT3_INODES_PER_GROUP(sb),
1373 sbi->s_mount_opt);
1374
1da177e4
LT		 1375 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1376 char b[BDEVNAME_SIZE];
4cf46b67 1377 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1da177e4
LT		 1378 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1379 } else {
4cf46b67 1380 ext3_msg(sb, KERN_INFO, "using internal journal");
1da177e4 1381 }
d71bc6db 1382 cleancache_init_fs(sb);
1da177e4
LT		 1383 return res;
1384}
1385
1386/* Called at mount-time, super-block is locked */
197cd65a 1387static int ext3_check_descriptors(struct super_block *sb)
1da177e4
LT		 1388{
1389 struct ext3_sb_info *sbi = EXT3_SB(sb);
1da177e4
LT		 1390 int i;
1391
1392 ext3_debug ("Checking group descriptors");
1393
197cd65a
AM		 1394 for (i = 0; i < sbi->s_groups_count; i++) {
1395 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1eaafeae
AM		 1396 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1397 ext3_fsblk_t last_block;
197cd65a 1398
855565e8
ES		 1399 if (i == sbi->s_groups_count - 1)
1400 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1401 else
1402 last_block = first_block +
1403 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1404
855565e8
ES		 1405 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1406 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 1407 {
1408 ext3_error (sb, "ext3_check_descriptors",
1409 "Block bitmap for group %d"
1410 " not in group (block %lu)!",
1411 i, (unsigned long)
1412 le32_to_cpu(gdp->bg_block_bitmap));
1413 return 0;
1414 }
855565e8
ES		 1415 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1416 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 1417 {
1418 ext3_error (sb, "ext3_check_descriptors",
1419 "Inode bitmap for group %d"
1420 " not in group (block %lu)!",
1421 i, (unsigned long)
1422 le32_to_cpu(gdp->bg_inode_bitmap));
1423 return 0;
1424 }
855565e8 1425 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 1426 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
855565e8 1427 last_block)
1da177e4
LT		 1428 {
1429 ext3_error (sb, "ext3_check_descriptors",
1430 "Inode table for group %d"
1431 " not in group (block %lu)!",
1432 i, (unsigned long)
1433 le32_to_cpu(gdp->bg_inode_table));
1434 return 0;
1435 }
1da177e4
LT		 1436 }
1437
1438 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1439 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1440 return 1;
1441}
1442
1443
1444/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1445 * the superblock) which were deleted from all directories, but held open by
1446 * a process at the time of a crash. We walk the list and try to delete these
1447 * inodes at recovery time (only with a read-write filesystem).
1448 *
1449 * In order to keep the orphan inode chain consistent during traversal (in
1450 * case of crash during recovery), we link each inode into the superblock
1451 * orphan list_head and handle it the same way as an inode deletion during
1452 * normal operation (which journals the operations for us).
1453 *
1454 * We only do an iget() and an iput() on each inode, which is very safe if we
1455 * accidentally point at an in-use or already deleted inode. The worst that
1456 * can happen in this case is that we get a "bit already cleared" message from
1457 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1458 * e2fsck was run on this filesystem, and it must have already done the orphan
1459 * inode cleanup for us, so we can safely abort without any further action.
1460 */
1461static void ext3_orphan_cleanup (struct super_block * sb,
1462 struct ext3_super_block * es)
1463{
1464 unsigned int s_flags = sb->s_flags;
1465 int nr_orphans = 0, nr_truncates = 0;
1466#ifdef CONFIG_QUOTA
1467 int i;
1468#endif
1469 if (!es->s_last_orphan) {
1470 jbd_debug(4, "no orphan inodes to clean up\n");
1471 return;
1472 }
1473
a8f48a95 1474 if (bdev_read_only(sb->s_bdev)) {
4cf46b67
OR		 1475 ext3_msg(sb, KERN_ERR, "error: write access "
1476 "unavailable, skipping orphan cleanup.");
a8f48a95
ES		 1477 return;
1478 }
1479
ce654b37
AG		 1480 /* Check if feature set allows readwrite operations */
1481 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1482 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1483 "unknown ROCOMPAT features");
1484 return;
a8f48a95
ES		 1485 }
1486
1da177e4
LT		 1487 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1488 if (es->s_last_orphan)
1489 jbd_debug(1, "Errors on filesystem, "
1490 "clearing orphan list.\n");
1491 es->s_last_orphan = 0;
1492 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1493 return;
1494 }
1495
1496 if (s_flags & MS_RDONLY) {
4cf46b67 1497 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1da177e4
LT		 1498 sb->s_flags &= ~MS_RDONLY;
1499 }
1500#ifdef CONFIG_QUOTA
1501 /* Needed for iput() to work correctly and not trash data */
1502 sb->s_flags |= MS_ACTIVE;
1503 /* Turn on quotas so that they are updated correctly */
1504 for (i = 0; i < MAXQUOTAS; i++) {
1505 if (EXT3_SB(sb)->s_qf_names[i]) {
1506 int ret = ext3_quota_on_mount(sb, i);
1507 if (ret < 0)
4cf46b67
OR		 1508 ext3_msg(sb, KERN_ERR,
1509 "error: cannot turn on journaled "
1510 "quota: %d", ret);
1da177e4
LT		 1511 }
1512 }
1513#endif
1514
1515 while (es->s_last_orphan) {
1516 struct inode *inode;
1517
473043dc
DH		 1518 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1519 if (IS_ERR(inode)) {
1da177e4
LT		 1520 es->s_last_orphan = 0;
1521 break;
1522 }
1523
1524 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
871a2931 1525 dquot_initialize(inode);
1da177e4
LT		 1526 if (inode->i_nlink) {
1527 printk(KERN_DEBUG
eee194e7 1528 "%s: truncating inode %lu to %Ld bytes\n",
e05b6b52 1529 __func__, inode->i_ino, inode->i_size);
eee194e7 1530 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1da177e4
LT		 1531 inode->i_ino, inode->i_size);
1532 ext3_truncate(inode);
1533 nr_truncates++;
1534 } else {
1535 printk(KERN_DEBUG
eee194e7 1536 "%s: deleting unreferenced inode %lu\n",
e05b6b52 1537 __func__, inode->i_ino);
eee194e7 1538 jbd_debug(2, "deleting unreferenced inode %lu\n",
1da177e4
LT		 1539 inode->i_ino);
1540 nr_orphans++;
1541 }
1542 iput(inode); /* The delete magic happens here! */
1543 }
1544
1545#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1546
1547 if (nr_orphans)
4cf46b67
OR		 1548 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1549 PLURAL(nr_orphans));
1da177e4 1550 if (nr_truncates)
4cf46b67
OR		 1551 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1552 PLURAL(nr_truncates));
1da177e4
LT		 1553#ifdef CONFIG_QUOTA
1554 /* Turn quotas off */
1555 for (i = 0; i < MAXQUOTAS; i++) {
1556 if (sb_dqopt(sb)->files[i])
287a8095 1557 dquot_quota_off(sb, i);
1da177e4
LT		 1558 }
1559#endif
1560 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1561}
1562
1da177e4
LT		 1563/*
1564 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1565 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1566 * We need to be 1 filesystem block less than the 2^32 sector limit.
1567 */
1568static loff_t ext3_max_size(int bits)
1569{
1570 loff_t res = EXT3_NDIR_BLOCKS;
fe7fdc37
AK		 1571 int meta_blocks;
1572 loff_t upper_limit;
1573
1574 /* This is calculated to be the largest file size for a
1575 * dense, file such that the total number of
1da177e4 1576 * sectors in the file, including data and all indirect blocks,
fe7fdc37
AK		 1577 * does not exceed 2^32 -1
1578 * __u32 i_blocks representing the total number of
1579 * 512 bytes blocks of the file
1580 */
1581 upper_limit = (1LL << 32) - 1;
1582
1583 /* total blocks in file system block size */
1584 upper_limit >>= (bits - 9);
1585
1586
1587 /* indirect blocks */
1588 meta_blocks = 1;
1589 /* double indirect blocks */
1590 meta_blocks += 1 + (1LL << (bits-2));
1591 /* tripple indirect blocks */
1592 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1593
1594 upper_limit -= meta_blocks;
1595 upper_limit <<= bits;
1da177e4
LT		 1596
1597 res += 1LL << (bits-2);
1598 res += 1LL << (2*(bits-2));
1599 res += 1LL << (3*(bits-2));
1600 res <<= bits;
1601 if (res > upper_limit)
1602 res = upper_limit;
fe7fdc37
AK		 1603
1604 if (res > MAX_LFS_FILESIZE)
1605 res = MAX_LFS_FILESIZE;
1606
1da177e4
LT		 1607 return res;
1608}
1609
43d23f90
MC		 1610static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1611 ext3_fsblk_t logic_sb_block,
1da177e4
LT		 1612 int nr)
1613{
1614 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 1615 unsigned long bg, first_meta_bg;
1da177e4
LT		 1616 int has_super = 0;
1617
1da177e4
LT		 1618 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1619
1620 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1621 nr < first_meta_bg)
1622 return (logic_sb_block + nr + 1);
1623 bg = sbi->s_desc_per_block * nr;
1624 if (ext3_bg_has_super(sb, bg))
1625 has_super = 1;
43d23f90 1626 return (has_super + ext3_group_first_block_no(sb, bg));
1da177e4
LT		 1627}
1628
1629
1630static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1631{
1632 struct buffer_head * bh;
1633 struct ext3_super_block *es = NULL;
1634 struct ext3_sb_info *sbi;
43d23f90 1635 ext3_fsblk_t block;
4cf46b67 1636 ext3_fsblk_t sb_block = get_sb_block(&data, sb);
43d23f90 1637 ext3_fsblk_t logic_sb_block;
1da177e4 1638 unsigned long offset = 0;
eee194e7 1639 unsigned int journal_inum = 0;
71b96257 1640 unsigned long journal_devnum = 0;
1da177e4
LT		 1641 unsigned long def_mount_opts;
1642 struct inode *root;
1643 int blocksize;
1644 int hblock;
1645 int db_count;
1646 int i;
1647 int needs_recovery;
473043dc 1648 int ret = -EINVAL;
1da177e4 1649 __le32 features;
833f4077 1650 int err;
1da177e4 1651
f8314dc6 1652 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 1653 if (!sbi)
1654 return -ENOMEM;
5df096d6
PE		 1655
1656 sbi->s_blockgroup_lock =
1657 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1658 if (!sbi->s_blockgroup_lock) {
1659 kfree(sbi);
1660 return -ENOMEM;
1661 }
1da177e4 1662 sb->s_fs_info = sbi;
1da177e4
LT		 1663 sbi->s_mount_opt = 0;
1664 sbi->s_resuid = EXT3_DEF_RESUID;
1665 sbi->s_resgid = EXT3_DEF_RESGID;
571beed8 1666 sbi->s_sb_block = sb_block;
1da177e4 1667
1da177e4
LT		 1668 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1669 if (!blocksize) {
4cf46b67 1670 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1da177e4
LT		 1671 goto out_fail;
1672 }
1673
1674 /*
1675 * The ext3 superblock will not be buffer aligned for other than 1kB
1676 * block sizes. We need to calculate the offset from buffer start.
1677 */
1678 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1679 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1680 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1681 } else {
1682 logic_sb_block = sb_block;
1683 }
1684
1685 if (!(bh = sb_bread(sb, logic_sb_block))) {
4cf46b67 1686 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1da177e4
LT		 1687 goto out_fail;
1688 }
1689 /*
1690 * Note: s_es must be initialized as soon as possible because
1691 * some ext3 macro-instructions depend on its value
1692 */
57e94d86 1693 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 1694 sbi->s_es = es;
1695 sb->s_magic = le16_to_cpu(es->s_magic);
1696 if (sb->s_magic != EXT3_SUPER_MAGIC)
1697 goto cantfind_ext3;
1698
1699 /* Set defaults before we parse the mount options */
1700 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1701 if (def_mount_opts & EXT3_DEFM_DEBUG)
1702 set_opt(sbi->s_mount_opt, DEBUG);
1703 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1704 set_opt(sbi->s_mount_opt, GRPID);
1705 if (def_mount_opts & EXT3_DEFM_UID16)
1706 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1707#ifdef CONFIG_EXT3_FS_XATTR
1da177e4
LT		 1708 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1709 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1710#endif
1711#ifdef CONFIG_EXT3_FS_POSIX_ACL
1da177e4
LT		 1712 if (def_mount_opts & EXT3_DEFM_ACL)
1713 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1714#endif
1da177e4 1715 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
e3c96435 1716 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1da177e4 1717 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
e3c96435 1718 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1da177e4 1719 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
e3c96435 1720 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1da177e4
LT		 1721
1722 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1723 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1eca93f9 1724 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
2245d7c2 1725 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1eca93f9
AK		 1726 else
1727 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 1728
1729 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1730 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1731
00eacd66
CH		 1732 /* enable barriers by default */
1733 set_opt(sbi->s_mount_opt, BARRIER);
1da177e4
LT		 1734 set_opt(sbi->s_mount_opt, RESERVATION);
1735
71b96257
JL		 1736 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1737 NULL, 0))
1da177e4
LT		 1738 goto failed_mount;
1739
1740 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 1741 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 1742
1743 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1744 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1745 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1746 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
4cf46b67
OR		 1747 ext3_msg(sb, KERN_WARNING,
1748 "warning: feature flags set on rev 0 fs, "
1749 "running e2fsck is recommended");
1da177e4
LT		 1750 /*
1751 * Check feature flags regardless of the revision level, since we
1752 * previously didn't change the revision level when setting the flags,
1753 * so there is a chance incompat flags are set on a rev 0 filesystem.
1754 */
1755 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1756 if (features) {
4cf46b67
OR		 1757 ext3_msg(sb, KERN_ERR,
1758 "error: couldn't mount because of unsupported "
1759 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1760 goto failed_mount;
1761 }
1762 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1763 if (!(sb->s_flags & MS_RDONLY) && features) {
4cf46b67
OR		 1764 ext3_msg(sb, KERN_ERR,
1765 "error: couldn't mount RDWR because of unsupported "
1766 "optional features (%x)", le32_to_cpu(features));
1da177e4
LT		 1767 goto failed_mount;
1768 }
1769 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1770
1771 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1772 blocksize > EXT3_MAX_BLOCK_SIZE) {
4cf46b67
OR		 1773 ext3_msg(sb, KERN_ERR,
1774 "error: couldn't mount because of unsupported "
1775 "filesystem blocksize %d", blocksize);
1da177e4
LT		 1776 goto failed_mount;
1777 }
1778
e1defc4f 1779 hblock = bdev_logical_block_size(sb->s_bdev);
1da177e4
LT		 1780 if (sb->s_blocksize != blocksize) {
1781 /*
1782 * Make sure the blocksize for the filesystem is larger
1783 * than the hardware sectorsize for the machine.
1784 */
1785 if (blocksize < hblock) {
4cf46b67
OR		 1786 ext3_msg(sb, KERN_ERR,
1787 "error: fsblocksize %d too small for "
1788 "hardware sectorsize %d", blocksize, hblock);
1da177e4
LT		 1789 goto failed_mount;
1790 }
1791
1792 brelse (bh);
0f0a89eb 1793 if (!sb_set_blocksize(sb, blocksize)) {
4cf46b67
OR		 1794 ext3_msg(sb, KERN_ERR,
1795 "error: bad blocksize %d", blocksize);
0f0a89eb
TS		 1796 goto out_fail;
1797 }
1da177e4
LT		 1798 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1799 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1800 bh = sb_bread(sb, logic_sb_block);
1801 if (!bh) {
4cf46b67
OR		 1802 ext3_msg(sb, KERN_ERR,
1803 "error: can't read superblock on 2nd try");
1da177e4
LT		 1804 goto failed_mount;
1805 }
57e94d86 1806 es = (struct ext3_super_block *)(bh->b_data + offset);
1da177e4
LT		 1807 sbi->s_es = es;
1808 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
4cf46b67
OR		 1809 ext3_msg(sb, KERN_ERR,
1810 "error: magic mismatch");
1da177e4
LT		 1811 goto failed_mount;
1812 }
1813 }
1814
1815 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1816
1817 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1818 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1819 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1820 } else {
1821 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1822 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1823 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
3fc74269 1824 (!is_power_of_2(sbi->s_inode_size)) ||
1da177e4 1825 (sbi->s_inode_size > blocksize)) {
4cf46b67
OR		 1826 ext3_msg(sb, KERN_ERR,
1827 "error: unsupported inode size: %d",
1da177e4
LT		 1828 sbi->s_inode_size);
1829 goto failed_mount;
1830 }
1831 }
1832 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1833 le32_to_cpu(es->s_log_frag_size);
1834 if (blocksize != sbi->s_frag_size) {
4cf46b67
OR		 1835 ext3_msg(sb, KERN_ERR,
1836 "error: fragsize %lu != blocksize %u (unsupported)",
1da177e4
LT		 1837 sbi->s_frag_size, blocksize);
1838 goto failed_mount;
1839 }
1840 sbi->s_frags_per_block = 1;
1841 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1842 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1843 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1844 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1da177e4
LT		 1845 goto cantfind_ext3;
1846 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1847 if (sbi->s_inodes_per_block == 0)
1848 goto cantfind_ext3;
1849 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1850 sbi->s_inodes_per_block;
1851 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1852 sbi->s_sbh = bh;
1853 sbi->s_mount_state = le16_to_cpu(es->s_state);
f0d1b0b3
DH		 1854 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1855 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1856 for (i=0; i < 4; i++)
1857 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1858 sbi->s_def_hash_version = es->s_def_hash_version;
5e1f8c9e
TT		 1859 i = le32_to_cpu(es->s_flags);
1860 if (i & EXT2_FLAGS_UNSIGNED_HASH)
1861 sbi->s_hash_unsigned = 3;
1862 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1863#ifdef __CHAR_UNSIGNED__
1864 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1865 sbi->s_hash_unsigned = 3;
1866#else
1867 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1868#endif
5e1f8c9e 1869 }
1da177e4
LT		 1870
1871 if (sbi->s_blocks_per_group > blocksize * 8) {
4cf46b67
OR		 1872 ext3_msg(sb, KERN_ERR,
1873 "#blocks per group too big: %lu",
1da177e4
LT		 1874 sbi->s_blocks_per_group);
1875 goto failed_mount;
1876 }
1877 if (sbi->s_frags_per_group > blocksize * 8) {
4cf46b67
OR		 1878 ext3_msg(sb, KERN_ERR,
1879 "error: #fragments per group too big: %lu",
1da177e4
LT		 1880 sbi->s_frags_per_group);
1881 goto failed_mount;
1882 }
1883 if (sbi->s_inodes_per_group > blocksize * 8) {
4cf46b67
OR		 1884 ext3_msg(sb, KERN_ERR,
1885 "error: #inodes per group too big: %lu",
1da177e4
LT		 1886 sbi->s_inodes_per_group);
1887 goto failed_mount;
1888 }
1889
ad692bf3
DW		 1890 err = generic_check_addressable(sb->s_blocksize_bits,
1891 le32_to_cpu(es->s_blocks_count));
1892 if (err) {
4cf46b67
OR		 1893 ext3_msg(sb, KERN_ERR,
1894 "error: filesystem is too large to mount safely");
fcd5df35 1895 if (sizeof(sector_t) < 8)
4cf46b67
OR		 1896 ext3_msg(sb, KERN_ERR,
1897 "error: CONFIG_LBDAF not enabled");
ad692bf3 1898 ret = err;
fcd5df35
MC		 1899 goto failed_mount;
1900 }
1901
1da177e4
LT		 1902 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1903 goto cantfind_ext3;
855565e8
ES		 1904 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1905 le32_to_cpu(es->s_first_data_block) - 1)
1906 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
81a4e320 1907 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1da177e4
LT		 1908 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1909 GFP_KERNEL);
1910 if (sbi->s_group_desc == NULL) {
4cf46b67
OR		 1911 ext3_msg(sb, KERN_ERR,
1912 "error: not enough memory");
4569cd1b 1913 ret = -ENOMEM;
1da177e4
LT		 1914 goto failed_mount;
1915 }
1916
5df096d6 1917 bgl_lock_init(sbi->s_blockgroup_lock);
1da177e4
LT		 1918
1919 for (i = 0; i < db_count; i++) {
1920 block = descriptor_loc(sb, logic_sb_block, i);
1921 sbi->s_group_desc[i] = sb_bread(sb, block);
1922 if (!sbi->s_group_desc[i]) {
4cf46b67
OR		 1923 ext3_msg(sb, KERN_ERR,
1924 "error: can't read group descriptor %d", i);
1da177e4
LT		 1925 db_count = i;
1926 goto failed_mount2;
1927 }
1928 }
1929 if (!ext3_check_descriptors (sb)) {
4cf46b67
OR		 1930 ext3_msg(sb, KERN_ERR,
1931 "error: group descriptors corrupted");
1da177e4
LT		 1932 goto failed_mount2;
1933 }
1934 sbi->s_gdb_count = db_count;
1935 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1936 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1937
1da177e4
LT		 1938 /* per fileystem reservation list head & lock */
1939 spin_lock_init(&sbi->s_rsv_window_lock);
1940 sbi->s_rsv_window_root = RB_ROOT;
1941 /* Add a single, static dummy reservation to the start of the
1942 * reservation window list --- it gives us a placeholder for
1943 * append-at-start-of-list which makes the allocation logic
1944 * _much_ simpler. */
1945 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1946 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1947 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1948 sbi->s_rsv_window_head.rsv_goal_size = 0;
1949 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1950
1951 /*
1952 * set up enough so that it can read an inode
1953 */
1954 sb->s_op = &ext3_sops;
1955 sb->s_export_op = &ext3_export_ops;
1956 sb->s_xattr = ext3_xattr_handlers;
1957#ifdef CONFIG_QUOTA
1958 sb->s_qcop = &ext3_qctl_operations;
1959 sb->dq_op = &ext3_quota_operations;
1960#endif
03cb5f03 1961 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1da177e4 1962 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
b8a052d0 1963 mutex_init(&sbi->s_orphan_lock);
96d2a495 1964 mutex_init(&sbi->s_resize_lock);
1da177e4
LT		 1965
1966 sb->s_root = NULL;
1967
1968 needs_recovery = (es->s_last_orphan != 0 ||
1969 EXT3_HAS_INCOMPAT_FEATURE(sb,
1970 EXT3_FEATURE_INCOMPAT_RECOVER));
1971
1972 /*
1973 * The first inode we look at is the journal inode. Don't try
1974 * root first: it may be modified in the journal!
1975 */
1976 if (!test_opt(sb, NOLOAD) &&
1977 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
71b96257 1978 if (ext3_load_journal(sb, es, journal_devnum))
41d1a636 1979 goto failed_mount2;
1da177e4
LT		 1980 } else if (journal_inum) {
1981 if (ext3_create_journal(sb, es, journal_inum))
41d1a636 1982 goto failed_mount2;
1da177e4
LT		 1983 } else {
1984 if (!silent)
4cf46b67
OR		 1985 ext3_msg(sb, KERN_ERR,
1986 "error: no journal found. "
1987 "mounting ext3 over ext2?");
41d1a636
DM		 1988 goto failed_mount2;
1989 }
1990 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1991 ext3_count_free_blocks(sb));
1992 if (!err) {
1993 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1994 ext3_count_free_inodes(sb));
1995 }
1996 if (!err) {
1997 err = percpu_counter_init(&sbi->s_dirs_counter,
1998 ext3_count_dirs(sb));
1999 }
2000 if (err) {
2001 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
4569cd1b 2002 ret = err;
0216bfcf 2003 goto failed_mount3;
1da177e4
LT		 2004 }
2005
2006 /* We have now updated the journal if required, so we can
2007 * validate the data journaling mode. */
2008 switch (test_opt(sb, DATA_FLAGS)) {
2009 case 0:
2010 /* No mode set, assume a default based on the journal
2011 capabilities: ORDERED_DATA if the journal can
2012 cope, else JOURNAL_DATA */
2013 if (journal_check_available_features
2014 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
bbae8bcc 2015 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1da177e4
LT		 2016 else
2017 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2018 break;
2019
2020 case EXT3_MOUNT_ORDERED_DATA:
2021 case EXT3_MOUNT_WRITEBACK_DATA:
2022 if (!journal_check_available_features
2023 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
4cf46b67
OR		 2024 ext3_msg(sb, KERN_ERR,
2025 "error: journal does not support "
2026 "requested data journaling mode");
41d1a636 2027 goto failed_mount3;
1da177e4
LT		 2028 }
2029 default:
2030 break;
2031 }
2032
1da177e4
LT		 2033 /*
2034 * The journal_load will have done any necessary log recovery,
2035 * so we can safely mount the rest of the filesystem now.
2036 */
2037
473043dc
DH		 2038 root = ext3_iget(sb, EXT3_ROOT_INO);
2039 if (IS_ERR(root)) {
4cf46b67 2040 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
473043dc 2041 ret = PTR_ERR(root);
41d1a636 2042 goto failed_mount3;
1da177e4
LT		 2043 }
2044 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
473043dc 2045 iput(root);
4cf46b67 2046 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
41d1a636 2047 goto failed_mount3;
1da177e4 2048 }
473043dc
DH		 2049 sb->s_root = d_alloc_root(root);
2050 if (!sb->s_root) {
4cf46b67 2051 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
473043dc
DH		 2052 iput(root);
2053 ret = -ENOMEM;
41d1a636 2054 goto failed_mount3;
473043dc 2055 }
1da177e4
LT		 2056
2057 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ed505ee4 2058
1da177e4
LT		 2059 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2060 ext3_orphan_cleanup(sb, es);
2061 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2062 if (needs_recovery)
4cf46b67 2063 ext3_msg(sb, KERN_INFO, "recovery complete");
1da177e4 2064 ext3_mark_recovery_complete(sb, es);
4cf46b67 2065 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
1da177e4
LT		 2066 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2067 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2068 "writeback");
2069
1da177e4
LT		 2070 return 0;
2071
2072cantfind_ext3:
2073 if (!silent)
4cf46b67
OR		 2074 ext3_msg(sb, KERN_INFO,
2075 "error: can't find ext3 filesystem on dev %s.",
1da177e4
LT		 2076 sb->s_id);
2077 goto failed_mount;
2078
0216bfcf
MC		 2079failed_mount3:
2080 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2081 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2082 percpu_counter_destroy(&sbi->s_dirs_counter);
41d1a636 2083 journal_destroy(sbi->s_journal);
1da177e4
LT		 2084failed_mount2:
2085 for (i = 0; i < db_count; i++)
2086 brelse(sbi->s_group_desc[i]);
2087 kfree(sbi->s_group_desc);
2088failed_mount:
2089#ifdef CONFIG_QUOTA
2090 for (i = 0; i < MAXQUOTAS; i++)
2091 kfree(sbi->s_qf_names[i]);
2092#endif
2093 ext3_blkdev_remove(sbi);
2094 brelse(bh);
2095out_fail:
2096 sb->s_fs_info = NULL;
de5ce037 2097 kfree(sbi->s_blockgroup_lock);
1da177e4 2098 kfree(sbi);
473043dc 2099 return ret;
1da177e4
LT		 2100}
2101
2102/*
2103 * Setup any per-fs journal parameters now. We'll do this both on
2104 * initial mount, once the journal has been initialised but before we've
ae6ddcc5 2105 * done any recovery; and again on any subsequent remount.
1da177e4
LT		 2106 */
2107static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2108{
2109 struct ext3_sb_info *sbi = EXT3_SB(sb);
2110
2111 if (sbi->s_commit_interval)
2112 journal->j_commit_interval = sbi->s_commit_interval;
2113 /* We could also set up an ext3-specific default for the commit
2114 * interval here, but for now we'll just fall back to the jbd
2115 * default. */
2116
2117 spin_lock(&journal->j_state_lock);
2118 if (test_opt(sb, BARRIER))
2119 journal->j_flags |= JFS_BARRIER;
2120 else
2121 journal->j_flags &= ~JFS_BARRIER;
0e4fb5e2
HK		 2122 if (test_opt(sb, DATA_ERR_ABORT))
2123 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2124 else
2125 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
1da177e4
LT		 2126 spin_unlock(&journal->j_state_lock);
2127}
2128
eee194e7
ES		 2129static journal_t *ext3_get_journal(struct super_block *sb,
2130 unsigned int journal_inum)
1da177e4
LT		 2131{
2132 struct inode *journal_inode;
2133 journal_t *journal;
2134
2135 /* First, test for the existence of a valid inode on disk. Bad
2136 * things happen if we iget() an unused inode, as the subsequent
2137 * iput() will try to delete it. */
2138
473043dc
DH		 2139 journal_inode = ext3_iget(sb, journal_inum);
2140 if (IS_ERR(journal_inode)) {
4cf46b67 2141 ext3_msg(sb, KERN_ERR, "error: no journal found");
1da177e4
LT		 2142 return NULL;
2143 }
2144 if (!journal_inode->i_nlink) {
2145 make_bad_inode(journal_inode);
2146 iput(journal_inode);
4cf46b67 2147 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
1da177e4
LT		 2148 return NULL;
2149 }
2150
2151 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2152 journal_inode, journal_inode->i_size);
473043dc 2153 if (!S_ISREG(journal_inode->i_mode)) {
4cf46b67 2154 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
1da177e4
LT		 2155 iput(journal_inode);
2156 return NULL;
2157 }
2158
2159 journal = journal_init_inode(journal_inode);
2160 if (!journal) {
4cf46b67 2161 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
1da177e4
LT		 2162 iput(journal_inode);
2163 return NULL;
2164 }
2165 journal->j_private = sb;
2166 ext3_init_journal_params(sb, journal);
2167 return journal;
2168}
2169
2170static journal_t *ext3_get_dev_journal(struct super_block *sb,
2171 dev_t j_dev)
2172{
2173 struct buffer_head * bh;
2174 journal_t *journal;
43d23f90 2175 ext3_fsblk_t start;
1c2bf374 2176 ext3_fsblk_t len;
1da177e4 2177 int hblock, blocksize;
43d23f90 2178 ext3_fsblk_t sb_block;
1da177e4
LT		 2179 unsigned long offset;
2180 struct ext3_super_block * es;
2181 struct block_device *bdev;
2182
4cf46b67 2183 bdev = ext3_blkdev_get(j_dev, sb);
1da177e4
LT		 2184 if (bdev == NULL)
2185 return NULL;
2186
1da177e4 2187 blocksize = sb->s_blocksize;
e1defc4f 2188 hblock = bdev_logical_block_size(bdev);
1da177e4 2189 if (blocksize < hblock) {
4cf46b67
OR		 2190 ext3_msg(sb, KERN_ERR,
2191 "error: blocksize too small for journal device");
1da177e4
LT		 2192 goto out_bdev;
2193 }
2194
2195 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2196 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2197 set_blocksize(bdev, blocksize);
2198 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4cf46b67
OR		 2199 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2200 "external journal");
1da177e4
LT		 2201 goto out_bdev;
2202 }
2203
57e94d86 2204 es = (struct ext3_super_block *) (bh->b_data + offset);
1da177e4
LT		 2205 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2206 !(le32_to_cpu(es->s_feature_incompat) &
2207 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4cf46b67
OR		 2208 ext3_msg(sb, KERN_ERR, "error: external journal has "
2209 "bad superblock");
1da177e4
LT		 2210 brelse(bh);
2211 goto out_bdev;
2212 }
2213
2214 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4cf46b67 2215 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
1da177e4
LT		 2216 brelse(bh);
2217 goto out_bdev;
2218 }
2219
2220 len = le32_to_cpu(es->s_blocks_count);
2221 start = sb_block + 1;
2222 brelse(bh); /* we're done with the superblock */
2223
2224 journal = journal_init_dev(bdev, sb->s_bdev,
2225 start, len, blocksize);
2226 if (!journal) {
4cf46b67
OR		 2227 ext3_msg(sb, KERN_ERR,
2228 "error: failed to create device journal");
1da177e4
LT		 2229 goto out_bdev;
2230 }
2231 journal->j_private = sb;
2232 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2233 wait_on_buffer(journal->j_sb_buffer);
2234 if (!buffer_uptodate(journal->j_sb_buffer)) {
4cf46b67 2235 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
1da177e4
LT		 2236 goto out_journal;
2237 }
2238 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4cf46b67
OR		 2239 ext3_msg(sb, KERN_ERR,
2240 "error: external journal has more than one "
2241 "user (unsupported) - %d",
1da177e4
LT		 2242 be32_to_cpu(journal->j_superblock->s_nr_users));
2243 goto out_journal;
2244 }
2245 EXT3_SB(sb)->journal_bdev = bdev;
2246 ext3_init_journal_params(sb, journal);
2247 return journal;
2248out_journal:
2249 journal_destroy(journal);
2250out_bdev:
2251 ext3_blkdev_put(bdev);
2252 return NULL;
2253}
2254
71b96257
JL		 2255static int ext3_load_journal(struct super_block *sb,
2256 struct ext3_super_block *es,
2257 unsigned long journal_devnum)
1da177e4
LT		 2258{
2259 journal_t *journal;
eee194e7 2260 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
71b96257 2261 dev_t journal_dev;
1da177e4
LT		 2262 int err = 0;
2263 int really_read_only;
2264
71b96257
JL		 2265 if (journal_devnum &&
2266 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4cf46b67
OR		 2267 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2268 "numbers have changed");
71b96257
JL		 2269 journal_dev = new_decode_dev(journal_devnum);
2270 } else
2271 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2272
1da177e4
LT		 2273 really_read_only = bdev_read_only(sb->s_bdev);
2274
2275 /*
2276 * Are we loading a blank journal or performing recovery after a
2277 * crash? For recovery, we need to check in advance whether we
2278 * can get read-write access to the device.
2279 */
2280
2281 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2282 if (sb->s_flags & MS_RDONLY) {
4cf46b67
OR		 2283 ext3_msg(sb, KERN_INFO,
2284 "recovery required on readonly filesystem");
1da177e4 2285 if (really_read_only) {
4cf46b67
OR		 2286 ext3_msg(sb, KERN_ERR, "error: write access "
2287 "unavailable, cannot proceed");
1da177e4
LT		 2288 return -EROFS;
2289 }
4cf46b67
OR		 2290 ext3_msg(sb, KERN_INFO,
2291 "write access will be enabled during recovery");
1da177e4
LT		 2292 }
2293 }
2294
2295 if (journal_inum && journal_dev) {
4cf46b67
OR		 2296 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2297 "and inode journals");
1da177e4
LT		 2298 return -EINVAL;
2299 }
2300
2301 if (journal_inum) {
2302 if (!(journal = ext3_get_journal(sb, journal_inum)))
2303 return -EINVAL;
2304 } else {
2305 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2306 return -EINVAL;
2307 }
2308
0636c73e
ES		 2309 if (!(journal->j_flags & JFS_BARRIER))
2310 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2311
1da177e4
LT		 2312 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2313 err = journal_update_format(journal);
2314 if (err) {
4cf46b67 2315 ext3_msg(sb, KERN_ERR, "error updating journal");
1da177e4
LT		 2316 journal_destroy(journal);
2317 return err;
2318 }
2319 }
2320
2321 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2322 err = journal_wipe(journal, !really_read_only);
2323 if (!err)
2324 err = journal_load(journal);
2325
2326 if (err) {
4cf46b67 2327 ext3_msg(sb, KERN_ERR, "error loading journal");
1da177e4
LT		 2328 journal_destroy(journal);
2329 return err;
2330 }
2331
2332 EXT3_SB(sb)->s_journal = journal;
2333 ext3_clear_journal_err(sb, es);
71b96257 2334
31d710a7 2335 if (!really_read_only && journal_devnum &&
71b96257
JL		 2336 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2337 es->s_journal_dev = cpu_to_le32(journal_devnum);
71b96257
JL		 2338
2339 /* Make sure we flush the recovery flag to disk. */
2340 ext3_commit_super(sb, es, 1);
2341 }
2342
1da177e4
LT		 2343 return 0;
2344}
2345
4cf46b67
OR		 2346static int ext3_create_journal(struct super_block *sb,
2347 struct ext3_super_block *es,
eee194e7 2348 unsigned int journal_inum)
1da177e4
LT		 2349{
2350 journal_t *journal;
952d9de1 2351 int err;
1da177e4
LT		 2352
2353 if (sb->s_flags & MS_RDONLY) {
4cf46b67
OR		 2354 ext3_msg(sb, KERN_ERR,
2355 "error: readonly filesystem when trying to "
2356 "create journal");
1da177e4
LT		 2357 return -EROFS;
2358 }
2359
952d9de1
BP		 2360 journal = ext3_get_journal(sb, journal_inum);
2361 if (!journal)
1da177e4
LT		 2362 return -EINVAL;
2363
4cf46b67 2364 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
1da177e4
LT		 2365 journal_inum);
2366
952d9de1
BP		 2367 err = journal_create(journal);
2368 if (err) {
4cf46b67 2369 ext3_msg(sb, KERN_ERR, "error creating journal");
1da177e4
LT		 2370 journal_destroy(journal);
2371 return -EIO;
2372 }
2373
2374 EXT3_SB(sb)->s_journal = journal;
2375
2376 ext3_update_dynamic_rev(sb);
2377 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2378 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2379
2380 es->s_journal_inum = cpu_to_le32(journal_inum);
1da177e4
LT		 2381
2382 /* Make sure we flush the recovery flag to disk. */
2383 ext3_commit_super(sb, es, 1);
2384
2385 return 0;
2386}
2387
c4be0c1d
TS		 2388static int ext3_commit_super(struct super_block *sb,
2389 struct ext3_super_block *es,
1da177e4
LT		 2390 int sync)
2391{
2392 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
c4be0c1d 2393 int error = 0;
1da177e4
LT		 2394
2395 if (!sbh)
c4be0c1d 2396 return error;
dff6825e
DW		 2397
2398 if (buffer_write_io_error(sbh)) {
2399 /*
2400 * Oh, dear. A previous attempt to write the
2401 * superblock failed. This could happen because the
2402 * USB device was yanked out. Or it could happen to
2403 * be a transient write error and maybe the block will
2404 * be remapped. Nothing we can do but to retry the
2405 * write and hope for the best.
2406 */
2407 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2408 "superblock detected");
2409 clear_buffer_write_io_error(sbh);
2410 set_buffer_uptodate(sbh);
2411 }
96ec2e0a
TT		 2412 /*
2413 * If the file system is mounted read-only, don't update the
2414 * superblock write time. This avoids updating the superblock
2415 * write time when we are mounting the root file system
2416 * read/only but we need to replay the journal; at that point,
2417 * for people who are east of GMT and who make their clock
2418 * tick in localtime for Windows bug-for-bug compatibility,
2419 * the clock is set in the future, and this will cause e2fsck
2420 * to complain and force a full file system check.
2421 */
2422 if (!(sb->s_flags & MS_RDONLY))
2423 es->s_wtime = cpu_to_le32(get_seconds());
1da177e4
LT		 2424 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2425 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2426 BUFFER_TRACE(sbh, "marking dirty");
2427 mark_buffer_dirty(sbh);
dff6825e 2428 if (sync) {
c4be0c1d 2429 error = sync_dirty_buffer(sbh);
dff6825e
DW		 2430 if (buffer_write_io_error(sbh)) {
2431 ext3_msg(sb, KERN_ERR, "I/O error while writing "
2432 "superblock");
2433 clear_buffer_write_io_error(sbh);
2434 set_buffer_uptodate(sbh);
2435 }
2436 }
c4be0c1d 2437 return error;
1da177e4
LT		 2438}
2439
2440
2441/*
2442 * Have we just finished recovery? If so, and if we are mounting (or
2443 * remounting) the filesystem readonly, then we will end up with a
2444 * consistent fs on disk. Record that fact.
2445 */
2446static void ext3_mark_recovery_complete(struct super_block * sb,
2447 struct ext3_super_block * es)
2448{
2449 journal_t *journal = EXT3_SB(sb)->s_journal;
2450
2451 journal_lock_updates(journal);
2d7c820e
HK		 2452 if (journal_flush(journal) < 0)
2453 goto out;
2454
1da177e4
LT		 2455 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2456 sb->s_flags & MS_RDONLY) {
2457 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1da177e4
LT		 2458 ext3_commit_super(sb, es, 1);
2459 }
2d7c820e
HK		 2460
2461out:
1da177e4
LT		 2462 journal_unlock_updates(journal);
2463}
2464
2465/*
2466 * If we are mounting (or read-write remounting) a filesystem whose journal
2467 * has recorded an error from a previous lifetime, move that error to the
2468 * main filesystem now.
2469 */
4cf46b67
OR		 2470static void ext3_clear_journal_err(struct super_block *sb,
2471 struct ext3_super_block *es)
1da177e4
LT		 2472{
2473 journal_t *journal;
2474 int j_errno;
2475 const char *errstr;
2476
2477 journal = EXT3_SB(sb)->s_journal;
2478
2479 /*
2480 * Now check for any error status which may have been recorded in the
2481 * journal by a prior ext3_error() or ext3_abort()
2482 */
2483
2484 j_errno = journal_errno(journal);
2485 if (j_errno) {
2486 char nbuf[16];
2487
2488 errstr = ext3_decode_error(sb, j_errno, nbuf);
e05b6b52 2489 ext3_warning(sb, __func__, "Filesystem error recorded "
1da177e4 2490 "from previous mount: %s", errstr);
e05b6b52 2491 ext3_warning(sb, __func__, "Marking fs in need of "
1da177e4
LT		 2492 "filesystem check.");
2493
2494 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2495 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2496 ext3_commit_super (sb, es, 1);
2497
2498 journal_clear_err(journal);
2499 }
2500}
2501
2502/*
2503 * Force the running and committing transactions to commit,
2504 * and wait on the commit.
2505 */
2506int ext3_force_commit(struct super_block *sb)
2507{
2508 journal_t *journal;
2509 int ret;
2510
2511 if (sb->s_flags & MS_RDONLY)
2512 return 0;
2513
2514 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2515 ret = ext3_journal_force_commit(journal);
2516 return ret;
2517}
2518
1da177e4
LT		 2519static int ext3_sync_fs(struct super_block *sb, int wait)
2520{
02ac597c 2521 tid_t target;
c87591b7 2522
785c4bcc 2523 trace_ext3_sync_fs(sb, wait);
02ac597c
JK		 2524 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2525 if (wait)
2526 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2527 }
1da177e4
LT		 2528 return 0;
2529}
2530
2531/*
2532 * LVM calls this function before a (read-only) snapshot is created. This
2533 * gives us a chance to flush the journal completely and mark the fs clean.
2534 */
c4be0c1d 2535static int ext3_freeze(struct super_block *sb)
1da177e4 2536{
c4be0c1d
TS		 2537 int error = 0;
2538 journal_t *journal;
1da177e4
LT		 2539
2540 if (!(sb->s_flags & MS_RDONLY)) {
c4be0c1d 2541 journal = EXT3_SB(sb)->s_journal;
1da177e4
LT		 2542
2543 /* Now we set up the journal barrier. */
2544 journal_lock_updates(journal);
2d7c820e
HK		 2545
2546 /*
2547 * We don't want to clear needs_recovery flag when we failed
2548 * to flush the journal.
2549 */
c4be0c1d
TS		 2550 error = journal_flush(journal);
2551 if (error < 0)
2552 goto out;
1da177e4
LT		 2553
2554 /* Journal blocked and flushed, clear needs_recovery flag. */
2555 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
c4be0c1d
TS		 2556 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2557 if (error)
2558 goto out;
1da177e4 2559 }
c4be0c1d
TS		 2560 return 0;
2561
2562out:
2563 journal_unlock_updates(journal);
2564 return error;
1da177e4
LT		 2565}
2566
2567/*
2568 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2569 * flag here, even though the filesystem is not technically dirty yet.
2570 */
c4be0c1d 2571static int ext3_unfreeze(struct super_block *sb)
1da177e4
LT		 2572{
2573 if (!(sb->s_flags & MS_RDONLY)) {
2574 lock_super(sb);
2575 /* Reser the needs_recovery flag before the fs is unlocked. */
2576 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2577 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2578 unlock_super(sb);
2579 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2580 }
c4be0c1d 2581 return 0;
1da177e4
LT		 2582}
2583
2584static int ext3_remount (struct super_block * sb, int * flags, char * data)
2585{
2586 struct ext3_super_block * es;
2587 struct ext3_sb_info *sbi = EXT3_SB(sb);
43d23f90 2588 ext3_fsblk_t n_blocks_count = 0;
08c6a96f
JK		 2589 unsigned long old_sb_flags;
2590 struct ext3_mount_options old_opts;
c79d967d 2591 int enable_quota = 0;
08c6a96f
JK		 2592 int err;
2593#ifdef CONFIG_QUOTA
2594 int i;
2595#endif
2596
2597 /* Store the original options */
bbd6851a 2598 lock_super(sb);
08c6a96f
JK		 2599 old_sb_flags = sb->s_flags;
2600 old_opts.s_mount_opt = sbi->s_mount_opt;
2601 old_opts.s_resuid = sbi->s_resuid;
2602 old_opts.s_resgid = sbi->s_resgid;
2603 old_opts.s_commit_interval = sbi->s_commit_interval;
2604#ifdef CONFIG_QUOTA
2605 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2606 for (i = 0; i < MAXQUOTAS; i++)
2607 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2608#endif
1da177e4
LT		 2609
2610 /*
2611 * Allow the "check" option to be passed as a remount option.
2612 */
71b96257 2613 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
08c6a96f
JK		 2614 err = -EINVAL;
2615 goto restore_opts;
2616 }
1da177e4 2617
e3c96435 2618 if (test_opt(sb, ABORT))
e05b6b52 2619 ext3_abort(sb, __func__, "Abort forced by user");
1da177e4
LT		 2620
2621 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
e3c96435 2622 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1da177e4
LT		 2623
2624 es = sbi->s_es;
2625
2626 ext3_init_journal_params(sb, sbi->s_journal);
2627
2628 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2629 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
e3c96435 2630 if (test_opt(sb, ABORT)) {
08c6a96f
JK		 2631 err = -EROFS;
2632 goto restore_opts;
2633 }
1da177e4
LT		 2634
2635 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 2636 err = dquot_suspend(sb, -1);
2637 if (err < 0)
c79d967d 2638 goto restore_opts;
c79d967d 2639
1da177e4
LT		 2640 /*
2641 * First of all, the unconditional stuff we have to do
2642 * to disable replay of the journal when we next remount
2643 */
2644 sb->s_flags |= MS_RDONLY;
2645
2646 /*
2647 * OK, test if we are remounting a valid rw partition
2648 * readonly, and if so set the rdonly flag and then
2649 * mark the partition as valid again.
2650 */
2651 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2652 (sbi->s_mount_state & EXT3_VALID_FS))
2653 es->s_state = cpu_to_le16(sbi->s_mount_state);
2654
2655 ext3_mark_recovery_complete(sb, es);
2656 } else {
2657 __le32 ret;
2658 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2659 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
4cf46b67
OR		 2660 ext3_msg(sb, KERN_WARNING,
2661 "warning: couldn't remount RDWR "
2662 "because of unsupported optional "
2663 "features (%x)", le32_to_cpu(ret));
08c6a96f
JK		 2664 err = -EROFS;
2665 goto restore_opts;
1da177e4 2666 }
ea9a05a1
ES		 2667
2668 /*
2669 * If we have an unprocessed orphan list hanging
2670 * around from a previously readonly bdev mount,
1cde201d 2671 * require a full umount & mount for now.
ea9a05a1
ES		 2672 */
2673 if (es->s_last_orphan) {
4cf46b67 2674 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
ea9a05a1
ES		 2675 "remount RDWR because of unprocessed "
2676 "orphan inode list. Please "
1cde201d 2677 "umount & mount instead.");
ea9a05a1
ES		 2678 err = -EINVAL;
2679 goto restore_opts;
2680 }
2681
1da177e4
LT		 2682 /*
2683 * Mounting a RDONLY partition read-write, so reread
2684 * and store the current valid flag. (It may have
2685 * been changed by e2fsck since we originally mounted
2686 * the partition.)
2687 */
2688 ext3_clear_journal_err(sb, es);
2689 sbi->s_mount_state = le16_to_cpu(es->s_state);
a4e4de36 2690 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
08c6a96f 2691 goto restore_opts;
1da177e4
LT		 2692 if (!ext3_setup_super (sb, es, 0))
2693 sb->s_flags &= ~MS_RDONLY;
c79d967d 2694 enable_quota = 1;
1da177e4
LT		 2695 }
2696 }
08c6a96f
JK		 2697#ifdef CONFIG_QUOTA
2698 /* Release old quota file names */
2699 for (i = 0; i < MAXQUOTAS; i++)
2700 if (old_opts.s_qf_names[i] &&
2701 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2702 kfree(old_opts.s_qf_names[i]);
2703#endif
bbd6851a 2704 unlock_super(sb);
c79d967d
CH		 2705
2706 if (enable_quota)
0f0dd62f 2707 dquot_resume(sb, -1);
1da177e4 2708 return 0;
08c6a96f
JK		 2709restore_opts:
2710 sb->s_flags = old_sb_flags;
2711 sbi->s_mount_opt = old_opts.s_mount_opt;
2712 sbi->s_resuid = old_opts.s_resuid;
2713 sbi->s_resgid = old_opts.s_resgid;
2714 sbi->s_commit_interval = old_opts.s_commit_interval;
2715#ifdef CONFIG_QUOTA
2716 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2717 for (i = 0; i < MAXQUOTAS; i++) {
2718 if (sbi->s_qf_names[i] &&
2719 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2720 kfree(sbi->s_qf_names[i]);
2721 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2722 }
2723#endif
bbd6851a 2724 unlock_super(sb);
08c6a96f 2725 return err;
1da177e4
LT		 2726}
2727
726c3342 2728static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 2729{
726c3342 2730 struct super_block *sb = dentry->d_sb;
09fe316a
AT		 2731 struct ext3_sb_info *sbi = EXT3_SB(sb);
2732 struct ext3_super_block *es = sbi->s_es;
50ee0a32 2733 u64 fsid;
1da177e4 2734
a71ce8c6
BP		 2735 if (test_opt(sb, MINIX_DF)) {
2736 sbi->s_overhead_last = 0;
2737 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2738 unsigned long ngroups = sbi->s_groups_count, i;
2739 ext3_fsblk_t overhead = 0;
1da177e4
LT		 2740 smp_rmb();
2741
2742 /*
a71ce8c6
BP		 2743 * Compute the overhead (FS structures). This is constant
2744 * for a given filesystem unless the number of block groups
2745 * changes so we cache the previous value until it does.
1da177e4
LT		 2746 */
2747
2748 /*
2749 * All of the blocks before first_data_block are
2750 * overhead
2751 */
2752 overhead = le32_to_cpu(es->s_first_data_block);
2753
2754 /*
2755 * Add the overhead attributed to the superblock and
2756 * block group descriptors. If the sparse superblocks
2757 * feature is turned on, then not all groups have this.
2758 */
2759 for (i = 0; i < ngroups; i++) {
2760 overhead += ext3_bg_has_super(sb, i) +
2761 ext3_bg_num_gdb(sb, i);
2762 cond_resched();
2763 }
2764
2765 /*
2766 * Every block group has an inode bitmap, a block
2767 * bitmap, and an inode table.
2768 */
a71ce8c6
BP		 2769 overhead += ngroups * (2 + sbi->s_itb_per_group);
2770 sbi->s_overhead_last = overhead;
2771 smp_wmb();
2772 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 2773 }
2774
2775 buf->f_type = EXT3_SUPER_MAGIC;
2776 buf->f_bsize = sb->s_blocksize;
a71ce8c6 2777 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
52d9f3b4 2778 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
1da177e4
LT		 2779 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2780 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2781 buf->f_bavail = 0;
2782 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2783 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
1da177e4 2784 buf->f_namelen = EXT3_NAME_LEN;
50ee0a32
PE		 2785 fsid = le64_to_cpup((void *)es->s_uuid) ^
2786 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2787 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2788 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 2789 return 0;
2790}
2791
2792/* Helper function for writing quotas on sync - we need to start transaction before quota file
2793 * is locked for write. Otherwise the are possible deadlocks:
2794 * Process 1 Process 2
2795 * ext3_create() quota_sync()
2796 * journal_start() write_dquot()
871a2931 2797 * dquot_initialize() down(dqio_mutex)
d3be915f 2798 * down(dqio_mutex) journal_start()
1da177e4
LT		 2799 *
2800 */
2801
2802#ifdef CONFIG_QUOTA
2803
2804static inline struct inode *dquot_to_inode(struct dquot *dquot)
2805{
2806 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2807}
2808
1da177e4
LT		 2809static int ext3_write_dquot(struct dquot *dquot)
2810{
2811 int ret, err;
2812 handle_t *handle;
2813 struct inode *inode;
2814
2815 inode = dquot_to_inode(dquot);
2816 handle = ext3_journal_start(inode,
1f54587b 2817 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2818 if (IS_ERR(handle))
2819 return PTR_ERR(handle);
2820 ret = dquot_commit(dquot);
2821 err = ext3_journal_stop(handle);
2822 if (!ret)
2823 ret = err;
2824 return ret;
2825}
2826
2827static int ext3_acquire_dquot(struct dquot *dquot)
2828{
2829 int ret, err;
2830 handle_t *handle;
2831
2832 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2833 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
1da177e4
LT		 2834 if (IS_ERR(handle))
2835 return PTR_ERR(handle);
2836 ret = dquot_acquire(dquot);
2837 err = ext3_journal_stop(handle);
2838 if (!ret)
2839 ret = err;
2840 return ret;
2841}
2842
2843static int ext3_release_dquot(struct dquot *dquot)
2844{
2845 int ret, err;
2846 handle_t *handle;
2847
2848 handle = ext3_journal_start(dquot_to_inode(dquot),
1f54587b 2849 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 2850 if (IS_ERR(handle)) {
2851 /* Release dquot anyway to avoid endless cycle in dqput() */
2852 dquot_release(dquot);
1da177e4 2853 return PTR_ERR(handle);
9c3013e9 2854 }
1da177e4
LT		 2855 ret = dquot_release(dquot);
2856 err = ext3_journal_stop(handle);
2857 if (!ret)
2858 ret = err;
2859 return ret;
2860}
2861
2862static int ext3_mark_dquot_dirty(struct dquot *dquot)
2863{
99aeaf63 2864 /* Are we journaling quotas? */
1da177e4
LT		 2865 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2866 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2867 dquot_mark_dquot_dirty(dquot);
2868 return ext3_write_dquot(dquot);
2869 } else {
2870 return dquot_mark_dquot_dirty(dquot);
2871 }
2872}
2873
2874static int ext3_write_info(struct super_block *sb, int type)
2875{
2876 int ret, err;
2877 handle_t *handle;
2878
2879 /* Data block + inode block */
2880 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2881 if (IS_ERR(handle))
2882 return PTR_ERR(handle);
2883 ret = dquot_commit_info(sb, type);
2884 err = ext3_journal_stop(handle);
2885 if (!ret)
2886 ret = err;
2887 return ret;
2888}
2889
2890/*
2891 * Turn on quotas during mount time - we need to find
2892 * the quota file and such...
2893 */
2894static int ext3_quota_on_mount(struct super_block *sb, int type)
2895{
287a8095
CH		 2896 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2897 EXT3_SB(sb)->s_jquota_fmt, type);
1da177e4
LT		 2898}
2899
2900/*
2901 * Standard function to be called on quota_on
2902 */
2903static int ext3_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 2904 struct path *path)
1da177e4
LT		 2905{
2906 int err;
1da177e4 2907
1f54587b
JK		 2908 if (!test_opt(sb, QUOTA))
2909 return -EINVAL;
9cfe7b90 2910
1da177e4 2911 /* Quotafile not on the same filesystem? */
d8c9584e 2912 if (path->dentry->d_sb != sb)
1da177e4 2913 return -EXDEV;
9cfe7b90
JK		 2914 /* Journaling quota? */
2915 if (EXT3_SB(sb)->s_qf_names[type]) {
2916 /* Quotafile not of fs root? */
f00c9e44 2917 if (path->dentry->d_parent != sb->s_root)
4cf46b67
OR		 2918 ext3_msg(sb, KERN_WARNING,
2919 "warning: Quota file not on filesystem root. "
2920 "Journaled quota will not work.");
9cfe7b90
JK		 2921 }
2922
2923 /*
2924 * When we journal data on quota file, we have to flush journal to see
2925 * all updates to the file when we bypass pagecache...
2926 */
f00c9e44 2927 if (ext3_should_journal_data(path->dentry->d_inode)) {
9cfe7b90
JK		 2928 /*
2929 * We don't need to lock updates but journal_flush() could
2930 * otherwise be livelocked...
2931 */
2932 journal_lock_updates(EXT3_SB(sb)->s_journal);
2d7c820e 2933 err = journal_flush(EXT3_SB(sb)->s_journal);
9cfe7b90 2934 journal_unlock_updates(EXT3_SB(sb)->s_journal);
f00c9e44 2935 if (err)
2d7c820e 2936 return err;
9cfe7b90
JK		 2937 }
2938
f00c9e44 2939 return dquot_quota_on(sb, type, format_id, path);
1da177e4
LT		 2940}
2941
2942/* Read data from quotafile - avoid pagecache and such because we cannot afford
2943 * acquiring the locks... As quota files are never truncated and quota code
25985edc 2944 * itself serializes the operations (and no one else should touch the files)
1da177e4
LT		 2945 * we don't have to be afraid of races */
2946static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2947 size_t len, loff_t off)
2948{
2949 struct inode *inode = sb_dqopt(sb)->files[type];
2950 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2951 int err = 0;
2952 int offset = off & (sb->s_blocksize - 1);
2953 int tocopy;
2954 size_t toread;
2955 struct buffer_head *bh;
2956 loff_t i_size = i_size_read(inode);
2957
2958 if (off > i_size)
2959 return 0;
2960 if (off+len > i_size)
2961 len = i_size-off;
2962 toread = len;
2963 while (toread > 0) {
2964 tocopy = sb->s_blocksize - offset < toread ?
2965 sb->s_blocksize - offset : toread;
2966 bh = ext3_bread(NULL, inode, blk, 0, &err);
2967 if (err)
2968 return err;
2969 if (!bh) /* A hole? */
2970 memset(data, 0, tocopy);
2971 else
2972 memcpy(data, bh->b_data+offset, tocopy);
2973 brelse(bh);
2974 offset = 0;
2975 toread -= tocopy;
2976 data += tocopy;
2977 blk++;
2978 }
2979 return len;
2980}
2981
2982/* Write to quotafile (we know the transaction is already started and has
2983 * enough credits) */
2984static ssize_t ext3_quota_write(struct super_block *sb, int type,
2985 const char *data, size_t len, loff_t off)
2986{
2987 struct inode *inode = sb_dqopt(sb)->files[type];
2988 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2989 int err = 0;
2990 int offset = off & (sb->s_blocksize - 1);
1da177e4 2991 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
1da177e4
LT		 2992 struct buffer_head *bh;
2993 handle_t *handle = journal_current_handle();
2994
9c3013e9 2995 if (!handle) {
4cf46b67
OR		 2996 ext3_msg(sb, KERN_WARNING,
2997 "warning: quota write (off=%llu, len=%llu)"
2998 " cancelled because transaction is not started.",
9c3013e9
JK		 2999 (unsigned long long)off, (unsigned long long)len);
3000 return -EIO;
3001 }
e5472147
DM		 3002
3003 /*
3004 * Since we account only one data block in transaction credits,
3005 * then it is impossible to cross a block boundary.
3006 */
3007 if (sb->s_blocksize - offset < len) {
3008 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3009 " cancelled because not block aligned",
3010 (unsigned long long)off, (unsigned long long)len);
3011 return -EIO;
3012 }
5c81a419 3013 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
e5472147
DM		 3014 bh = ext3_bread(handle, inode, blk, 1, &err);
3015 if (!bh)
3016 goto out;
3017 if (journal_quota) {
3018 err = ext3_journal_get_write_access(handle, bh);
3019 if (err) {
3020 brelse(bh);
1da177e4 3021 goto out;
1da177e4 3022 }
1da177e4 3023 }
e5472147
DM		 3024 lock_buffer(bh);
3025 memcpy(bh->b_data+offset, data, len);
3026 flush_dcache_page(bh->b_page);
3027 unlock_buffer(bh);
3028 if (journal_quota)
3029 err = ext3_journal_dirty_metadata(handle, bh);
3030 else {
3031 /* Always do at least ordered writes for quotas */
3032 err = ext3_journal_dirty_data(handle, bh);
3033 mark_buffer_dirty(bh);
3034 }
3035 brelse(bh);
1da177e4 3036out:
e5472147 3037 if (err) {
f5c8f7da 3038 mutex_unlock(&inode->i_mutex);
1da177e4 3039 return err;
f5c8f7da 3040 }
e5472147
DM		 3041 if (inode->i_size < off + len) {
3042 i_size_write(inode, off + len);
1da177e4
LT		 3043 EXT3_I(inode)->i_disksize = inode->i_size;
3044 }
3045 inode->i_version++;
3046 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3047 ext3_mark_inode_dirty(handle, inode);
1b1dcc1b 3048 mutex_unlock(&inode->i_mutex);
e5472147 3049 return len;
1da177e4
LT		 3050}
3051
3052#endif
3053
152a0836
AV		 3054static struct dentry *ext3_mount(struct file_system_type *fs_type,
3055 int flags, const char *dev_name, void *data)
1da177e4 3056{
152a0836 3057 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
1da177e4
LT		 3058}
3059
3060static struct file_system_type ext3_fs_type = {
3061 .owner = THIS_MODULE,
3062 .name = "ext3",
152a0836 3063 .mount = ext3_mount,
1da177e4
LT		 3064 .kill_sb = kill_block_super,
3065 .fs_flags = FS_REQUIRES_DEV,
3066};
3067
3068static int __init init_ext3_fs(void)
3069{
3070 int err = init_ext3_xattr();
3071 if (err)
3072 return err;
3073 err = init_inodecache();
3074 if (err)
3075 goto out1;
3076 err = register_filesystem(&ext3_fs_type);
3077 if (err)
3078 goto out;
3079 return 0;
3080out:
3081 destroy_inodecache();
3082out1:
e9ad5620 3083 exit_ext3_xattr();
1da177e4
LT		 3084 return err;
3085}
3086
3087static void __exit exit_ext3_fs(void)
3088{
3089 unregister_filesystem(&ext3_fs_type);
3090 destroy_inodecache();
3091 exit_ext3_xattr();
3092}
3093
3094MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3095MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3096MODULE_LICENSE("GPL");
3097module_init(init_ext3_fs)
3098module_exit(exit_ext3_fs)
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