blob: a60cc6ec130f4a1ebe5fcbe296fff141535108b8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
19#include <linux/config.h>
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
24#include <linux/jbd.h>
25#include <linux/ext3_fs.h>
26#include <linux/ext3_jbd.h>
27#include <linux/slab.h>
28#include <linux/init.h>
29#include <linux/blkdev.h>
30#include <linux/parser.h>
31#include <linux/smp_lock.h>
32#include <linux/buffer_head.h>
33#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
Mark Bellon8fc27512005-09-06 15:16:54 -070038#include <linux/seq_file.h>
Ben Dooks381be252005-10-30 15:02:56 -080039
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <asm/uaccess.h>
Ben Dooks381be252005-10-30 15:02:56 -080041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include "xattr.h"
43#include "acl.h"
Ben Dooks381be252005-10-30 15:02:56 -080044#include "namei.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Johann Lombardi71b96252006-01-08 01:03:20 -080046static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
49 int);
50static void ext3_commit_super (struct super_block * sb,
51 struct ext3_super_block * es,
52 int sync);
53static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57static int ext3_sync_fs(struct super_block *sb, int wait);
58static const char *ext3_decode_error(struct super_block * sb, int errno,
59 char nbuf[16]);
60static int ext3_remount (struct super_block * sb, int * flags, char * data);
David Howells726c3342006-06-23 02:02:58 -070061static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static void ext3_unlockfs(struct super_block *sb);
63static void ext3_write_super (struct super_block * sb);
64static void ext3_write_super_lockfs(struct super_block *sb);
65
66/*
67 * Wrappers for journal_start/end.
68 *
69 * The only special thing we need to do here is to make sure that all
70 * journal_end calls result in the superblock being marked dirty, so
71 * that sync() will call the filesystem's write_super callback if
72 * appropriate.
73 */
74handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
75{
76 journal_t *journal;
77
78 if (sb->s_flags & MS_RDONLY)
79 return ERR_PTR(-EROFS);
80
81 /* Special case here: if the journal has aborted behind our
82 * backs (eg. EIO in the commit thread), then we still need to
83 * take the FS itself readonly cleanly. */
84 journal = EXT3_SB(sb)->s_journal;
85 if (is_journal_aborted(journal)) {
86 ext3_abort(sb, __FUNCTION__,
87 "Detected aborted journal");
88 return ERR_PTR(-EROFS);
89 }
90
91 return journal_start(journal, nblocks);
92}
93
94/*
95 * The only special thing we need to do here is to make sure that all
96 * journal_stop calls result in the superblock being marked dirty, so
97 * that sync() will call the filesystem's write_super callback if
98 * appropriate.
99 */
100int __ext3_journal_stop(const char *where, handle_t *handle)
101{
102 struct super_block *sb;
103 int err;
104 int rc;
105
106 sb = handle->h_transaction->t_journal->j_private;
107 err = handle->h_err;
108 rc = journal_stop(handle);
109
110 if (!err)
111 err = rc;
112 if (err)
113 __ext3_std_error(sb, where, err);
114 return err;
115}
116
117void ext3_journal_abort_handle(const char *caller, const char *err_fn,
118 struct buffer_head *bh, handle_t *handle, int err)
119{
120 char nbuf[16];
121 const char *errstr = ext3_decode_error(NULL, err, nbuf);
122
123 if (bh)
124 BUFFER_TRACE(bh, "abort");
125
126 if (!handle->h_err)
127 handle->h_err = err;
128
129 if (is_handle_aborted(handle))
130 return;
131
132 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
133 caller, errstr, err_fn);
134
135 journal_abort_handle(handle);
136}
137
138/* Deal with the reporting of failure conditions on a filesystem such as
139 * inconsistencies detected or read IO failures.
140 *
141 * On ext2, we can store the error state of the filesystem in the
142 * superblock. That is not possible on ext3, because we may have other
143 * write ordering constraints on the superblock which prevent us from
144 * writing it out straight away; and given that the journal is about to
145 * be aborted, we can't rely on the current, or future, transactions to
146 * write out the superblock safely.
147 *
148 * We'll just use the journal_abort() error code to record an error in
149 * the journal instead. On recovery, the journal will compain about
150 * that error until we've noted it down and cleared it.
151 */
152
153static void ext3_handle_error(struct super_block *sb)
154{
155 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
156
157 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
158 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
159
160 if (sb->s_flags & MS_RDONLY)
161 return;
162
163 if (test_opt (sb, ERRORS_RO)) {
164 printk (KERN_CRIT "Remounting filesystem read-only\n");
165 sb->s_flags |= MS_RDONLY;
166 } else {
167 journal_t *journal = EXT3_SB(sb)->s_journal;
168
169 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
170 if (journal)
171 journal_abort(journal, -EIO);
172 }
173 if (test_opt(sb, ERRORS_PANIC))
174 panic("EXT3-fs (device %s): panic forced after error\n",
175 sb->s_id);
176 ext3_commit_super(sb, es, 1);
177}
178
179void ext3_error (struct super_block * sb, const char * function,
180 const char * fmt, ...)
181{
182 va_list args;
183
184 va_start(args, fmt);
185 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
186 vprintk(fmt, args);
187 printk("\n");
188 va_end(args);
189
190 ext3_handle_error(sb);
191}
192
193static const char *ext3_decode_error(struct super_block * sb, int errno,
194 char nbuf[16])
195{
196 char *errstr = NULL;
197
198 switch (errno) {
199 case -EIO:
200 errstr = "IO failure";
201 break;
202 case -ENOMEM:
203 errstr = "Out of memory";
204 break;
205 case -EROFS:
206 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
207 errstr = "Journal has aborted";
208 else
209 errstr = "Readonly filesystem";
210 break;
211 default:
212 /* If the caller passed in an extra buffer for unknown
213 * errors, textualise them now. Else we just return
214 * NULL. */
215 if (nbuf) {
216 /* Check for truncated error codes... */
217 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
218 errstr = nbuf;
219 }
220 break;
221 }
222
223 return errstr;
224}
225
226/* __ext3_std_error decodes expected errors from journaling functions
227 * automatically and invokes the appropriate error response. */
228
229void __ext3_std_error (struct super_block * sb, const char * function,
230 int errno)
231{
232 char nbuf[16];
Stephen Tweedie30121622005-05-18 11:47:17 -0400233 const char *errstr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Stephen Tweedie30121622005-05-18 11:47:17 -0400235 /* Special case: if the error is EROFS, and we're not already
236 * inside a transaction, then there's really no point in logging
237 * an error. */
238 if (errno == -EROFS && journal_current_handle() == NULL &&
239 (sb->s_flags & MS_RDONLY))
240 return;
241
242 errstr = ext3_decode_error(sb, errno, nbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
244 sb->s_id, function, errstr);
245
246 ext3_handle_error(sb);
247}
248
249/*
250 * ext3_abort is a much stronger failure handler than ext3_error. The
251 * abort function may be used to deal with unrecoverable failures such
252 * as journal IO errors or ENOMEM at a critical moment in log management.
253 *
254 * We unconditionally force the filesystem into an ABORT|READONLY state,
255 * unless the error response on the fs has been set to panic in which
256 * case we take the easy way out and panic immediately.
257 */
258
259void ext3_abort (struct super_block * sb, const char * function,
260 const char * fmt, ...)
261{
262 va_list args;
263
264 printk (KERN_CRIT "ext3_abort called.\n");
265
266 va_start(args, fmt);
267 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
268 vprintk(fmt, args);
269 printk("\n");
270 va_end(args);
271
272 if (test_opt(sb, ERRORS_PANIC))
273 panic("EXT3-fs panic from previous error\n");
274
275 if (sb->s_flags & MS_RDONLY)
276 return;
277
278 printk(KERN_CRIT "Remounting filesystem read-only\n");
279 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
280 sb->s_flags |= MS_RDONLY;
281 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
282 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
283}
284
285void ext3_warning (struct super_block * sb, const char * function,
286 const char * fmt, ...)
287{
288 va_list args;
289
290 va_start(args, fmt);
291 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
292 sb->s_id, function);
293 vprintk(fmt, args);
294 printk("\n");
295 va_end(args);
296}
297
298void ext3_update_dynamic_rev(struct super_block *sb)
299{
300 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
301
302 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
303 return;
304
305 ext3_warning(sb, __FUNCTION__,
306 "updating to rev %d because of new feature flag, "
307 "running e2fsck is recommended",
308 EXT3_DYNAMIC_REV);
309
310 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
311 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
312 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
313 /* leave es->s_feature_*compat flags alone */
314 /* es->s_uuid will be set by e2fsck if empty */
315
316 /*
317 * The rest of the superblock fields should be zero, and if not it
318 * means they are likely already in use, so leave them alone. We
319 * can leave it up to e2fsck to clean up any inconsistencies there.
320 */
321}
322
323/*
324 * Open the external journal device
325 */
326static struct block_device *ext3_blkdev_get(dev_t dev)
327{
328 struct block_device *bdev;
329 char b[BDEVNAME_SIZE];
330
331 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
332 if (IS_ERR(bdev))
333 goto fail;
334 return bdev;
335
336fail:
337 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
338 __bdevname(dev, b), PTR_ERR(bdev));
339 return NULL;
340}
341
342/*
343 * Release the journal device
344 */
345static int ext3_blkdev_put(struct block_device *bdev)
346{
347 bd_release(bdev);
348 return blkdev_put(bdev);
349}
350
351static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
352{
353 struct block_device *bdev;
354 int ret = -ENODEV;
355
356 bdev = sbi->journal_bdev;
357 if (bdev) {
358 ret = ext3_blkdev_put(bdev);
359 sbi->journal_bdev = NULL;
360 }
361 return ret;
362}
363
364static inline struct inode *orphan_list_entry(struct list_head *l)
365{
366 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
367}
368
369static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
370{
371 struct list_head *l;
372
373 printk(KERN_ERR "sb orphan head is %d\n",
374 le32_to_cpu(sbi->s_es->s_last_orphan));
375
376 printk(KERN_ERR "sb_info orphan list:\n");
377 list_for_each(l, &sbi->s_orphan) {
378 struct inode *inode = orphan_list_entry(l);
379 printk(KERN_ERR " "
380 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
381 inode->i_sb->s_id, inode->i_ino, inode,
382 inode->i_mode, inode->i_nlink,
383 NEXT_ORPHAN(inode));
384 }
385}
386
387static void ext3_put_super (struct super_block * sb)
388{
389 struct ext3_sb_info *sbi = EXT3_SB(sb);
390 struct ext3_super_block *es = sbi->s_es;
391 int i;
392
393 ext3_xattr_put_super(sb);
394 journal_destroy(sbi->s_journal);
395 if (!(sb->s_flags & MS_RDONLY)) {
396 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
397 es->s_state = cpu_to_le16(sbi->s_mount_state);
398 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
399 mark_buffer_dirty(sbi->s_sbh);
400 ext3_commit_super(sb, es, 1);
401 }
402
403 for (i = 0; i < sbi->s_gdb_count; i++)
404 brelse(sbi->s_group_desc[i]);
405 kfree(sbi->s_group_desc);
406 percpu_counter_destroy(&sbi->s_freeblocks_counter);
407 percpu_counter_destroy(&sbi->s_freeinodes_counter);
408 percpu_counter_destroy(&sbi->s_dirs_counter);
409 brelse(sbi->s_sbh);
410#ifdef CONFIG_QUOTA
411 for (i = 0; i < MAXQUOTAS; i++)
412 kfree(sbi->s_qf_names[i]);
413#endif
414
415 /* Debugging code just in case the in-memory inode orphan list
416 * isn't empty. The on-disk one can be non-empty if we've
417 * detected an error and taken the fs readonly, but the
418 * in-memory list had better be clean by this point. */
419 if (!list_empty(&sbi->s_orphan))
420 dump_orphan_list(sb, sbi);
421 J_ASSERT(list_empty(&sbi->s_orphan));
422
423 invalidate_bdev(sb->s_bdev, 0);
424 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
425 /*
426 * Invalidate the journal device's buffers. We don't want them
427 * floating about in memory - the physical journal device may
428 * hotswapped, and it breaks the `ro-after' testing code.
429 */
430 sync_blockdev(sbi->journal_bdev);
431 invalidate_bdev(sbi->journal_bdev, 0);
432 ext3_blkdev_remove(sbi);
433 }
434 sb->s_fs_info = NULL;
435 kfree(sbi);
436 return;
437}
438
439static kmem_cache_t *ext3_inode_cachep;
440
441/*
442 * Called inside transaction, so use GFP_NOFS
443 */
444static struct inode *ext3_alloc_inode(struct super_block *sb)
445{
446 struct ext3_inode_info *ei;
447
448 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
449 if (!ei)
450 return NULL;
451#ifdef CONFIG_EXT3_FS_POSIX_ACL
452 ei->i_acl = EXT3_ACL_NOT_CACHED;
453 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
454#endif
455 ei->i_block_alloc_info = NULL;
456 ei->vfs_inode.i_version = 1;
457 return &ei->vfs_inode;
458}
459
460static void ext3_destroy_inode(struct inode *inode)
461{
462 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
463}
464
465static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
466{
467 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
468
469 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
470 SLAB_CTOR_CONSTRUCTOR) {
471 INIT_LIST_HEAD(&ei->i_orphan);
472#ifdef CONFIG_EXT3_FS_XATTR
473 init_rwsem(&ei->xattr_sem);
474#endif
Arjan van de Ven97461512006-03-23 03:00:42 -0800475 mutex_init(&ei->truncate_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 inode_init_once(&ei->vfs_inode);
477 }
478}
479
480static int init_inodecache(void)
481{
482 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
483 sizeof(struct ext3_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800484 0, (SLAB_RECLAIM_ACCOUNT|
485 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 init_once, NULL);
487 if (ext3_inode_cachep == NULL)
488 return -ENOMEM;
489 return 0;
490}
491
492static void destroy_inodecache(void)
493{
494 if (kmem_cache_destroy(ext3_inode_cachep))
495 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
496}
497
498static void ext3_clear_inode(struct inode *inode)
499{
500 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
501#ifdef CONFIG_EXT3_FS_POSIX_ACL
Andrew Mortone6022602006-06-23 02:05:32 -0700502 if (EXT3_I(inode)->i_acl &&
503 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
504 posix_acl_release(EXT3_I(inode)->i_acl);
505 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
506 }
507 if (EXT3_I(inode)->i_default_acl &&
508 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
509 posix_acl_release(EXT3_I(inode)->i_default_acl);
510 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
511 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512#endif
513 ext3_discard_reservation(inode);
514 EXT3_I(inode)->i_block_alloc_info = NULL;
Andrew Mortone6022602006-06-23 02:05:32 -0700515 if (unlikely(rsv))
516 kfree(rsv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200519static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
Mark Bellon8fc27512005-09-06 15:16:54 -0700520{
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200521#if defined(CONFIG_QUOTA)
OGAWA Hirofumi275abf52005-09-22 21:44:03 -0700522 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Mark Bellon8fc27512005-09-06 15:16:54 -0700524 if (sbi->s_jquota_fmt)
525 seq_printf(seq, ",jqfmt=%s",
526 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
527
528 if (sbi->s_qf_names[USRQUOTA])
529 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
530
531 if (sbi->s_qf_names[GRPQUOTA])
532 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
533
534 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
535 seq_puts(seq, ",usrquota");
536
537 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
538 seq_puts(seq, ",grpquota");
539#endif
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200540}
541
542static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
543{
544 struct super_block *sb = vfs->mnt_sb;
545
546 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
547 seq_puts(seq, ",data=journal");
548 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
549 seq_puts(seq, ",data=ordered");
550 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
551 seq_puts(seq, ",data=writeback");
552
553 ext3_show_quota_options(seq, sb);
Mark Bellon8fc27512005-09-06 15:16:54 -0700554
555 return 0;
556}
557
558#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
560#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
561
562static int ext3_dquot_initialize(struct inode *inode, int type);
563static int ext3_dquot_drop(struct inode *inode);
564static int ext3_write_dquot(struct dquot *dquot);
565static int ext3_acquire_dquot(struct dquot *dquot);
566static int ext3_release_dquot(struct dquot *dquot);
567static int ext3_mark_dquot_dirty(struct dquot *dquot);
568static int ext3_write_info(struct super_block *sb, int type);
569static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
570static int ext3_quota_on_mount(struct super_block *sb, int type);
571static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
572 size_t len, loff_t off);
573static ssize_t ext3_quota_write(struct super_block *sb, int type,
574 const char *data, size_t len, loff_t off);
575
576static struct dquot_operations ext3_quota_operations = {
577 .initialize = ext3_dquot_initialize,
578 .drop = ext3_dquot_drop,
579 .alloc_space = dquot_alloc_space,
580 .alloc_inode = dquot_alloc_inode,
581 .free_space = dquot_free_space,
582 .free_inode = dquot_free_inode,
583 .transfer = dquot_transfer,
584 .write_dquot = ext3_write_dquot,
585 .acquire_dquot = ext3_acquire_dquot,
586 .release_dquot = ext3_release_dquot,
587 .mark_dirty = ext3_mark_dquot_dirty,
588 .write_info = ext3_write_info
589};
590
591static struct quotactl_ops ext3_qctl_operations = {
592 .quota_on = ext3_quota_on,
593 .quota_off = vfs_quota_off,
594 .quota_sync = vfs_quota_sync,
595 .get_info = vfs_get_dqinfo,
596 .set_info = vfs_set_dqinfo,
597 .get_dqblk = vfs_get_dqblk,
598 .set_dqblk = vfs_set_dqblk
599};
600#endif
601
602static struct super_operations ext3_sops = {
603 .alloc_inode = ext3_alloc_inode,
604 .destroy_inode = ext3_destroy_inode,
605 .read_inode = ext3_read_inode,
606 .write_inode = ext3_write_inode,
607 .dirty_inode = ext3_dirty_inode,
608 .delete_inode = ext3_delete_inode,
609 .put_super = ext3_put_super,
610 .write_super = ext3_write_super,
611 .sync_fs = ext3_sync_fs,
612 .write_super_lockfs = ext3_write_super_lockfs,
613 .unlockfs = ext3_unlockfs,
614 .statfs = ext3_statfs,
615 .remount_fs = ext3_remount,
616 .clear_inode = ext3_clear_inode,
Mark Bellon8fc27512005-09-06 15:16:54 -0700617 .show_options = ext3_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618#ifdef CONFIG_QUOTA
619 .quota_read = ext3_quota_read,
620 .quota_write = ext3_quota_write,
621#endif
622};
623
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624static struct export_operations ext3_export_ops = {
625 .get_parent = ext3_get_parent,
626};
627
628enum {
629 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
630 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Adrian Bunk2860b732005-11-08 21:34:59 -0800631 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
633 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
Johann Lombardi71b96252006-01-08 01:03:20 -0800634 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
636 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara1f545872005-06-23 22:01:04 -0700637 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Mark Bellon8fc27512005-09-06 15:16:54 -0700638 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
639 Opt_grpquota
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640};
641
642static match_table_t tokens = {
643 {Opt_bsd_df, "bsddf"},
644 {Opt_minix_df, "minixdf"},
645 {Opt_grpid, "grpid"},
646 {Opt_grpid, "bsdgroups"},
647 {Opt_nogrpid, "nogrpid"},
648 {Opt_nogrpid, "sysvgroups"},
649 {Opt_resgid, "resgid=%u"},
650 {Opt_resuid, "resuid=%u"},
651 {Opt_sb, "sb=%u"},
652 {Opt_err_cont, "errors=continue"},
653 {Opt_err_panic, "errors=panic"},
654 {Opt_err_ro, "errors=remount-ro"},
655 {Opt_nouid32, "nouid32"},
656 {Opt_nocheck, "nocheck"},
657 {Opt_nocheck, "check=none"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 {Opt_debug, "debug"},
659 {Opt_oldalloc, "oldalloc"},
660 {Opt_orlov, "orlov"},
661 {Opt_user_xattr, "user_xattr"},
662 {Opt_nouser_xattr, "nouser_xattr"},
663 {Opt_acl, "acl"},
664 {Opt_noacl, "noacl"},
665 {Opt_reservation, "reservation"},
666 {Opt_noreservation, "noreservation"},
667 {Opt_noload, "noload"},
668 {Opt_nobh, "nobh"},
669 {Opt_commit, "commit=%u"},
670 {Opt_journal_update, "journal=update"},
671 {Opt_journal_inum, "journal=%u"},
Johann Lombardi71b96252006-01-08 01:03:20 -0800672 {Opt_journal_dev, "journal_dev=%u"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 {Opt_abort, "abort"},
674 {Opt_data_journal, "data=journal"},
675 {Opt_data_ordered, "data=ordered"},
676 {Opt_data_writeback, "data=writeback"},
677 {Opt_offusrjquota, "usrjquota="},
678 {Opt_usrjquota, "usrjquota=%s"},
679 {Opt_offgrpjquota, "grpjquota="},
680 {Opt_grpjquota, "grpjquota=%s"},
681 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
682 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700683 {Opt_grpquota, "grpquota"},
Jan Kara1f545872005-06-23 22:01:04 -0700684 {Opt_noquota, "noquota"},
685 {Opt_quota, "quota"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700686 {Opt_usrquota, "usrquota"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 {Opt_barrier, "barrier=%u"},
688 {Opt_err, NULL},
689 {Opt_resize, "resize"},
690};
691
692static unsigned long get_sb_block(void **data)
693{
694 unsigned long sb_block;
695 char *options = (char *) *data;
696
697 if (!options || strncmp(options, "sb=", 3) != 0)
698 return 1; /* Default location */
699 options += 3;
700 sb_block = simple_strtoul(options, &options, 0);
701 if (*options && *options != ',') {
702 printk("EXT3-fs: Invalid sb specification: %s\n",
703 (char *) *data);
704 return 1;
705 }
706 if (*options == ',')
707 options++;
708 *data = (void *) options;
709 return sb_block;
710}
711
Johann Lombardi71b96252006-01-08 01:03:20 -0800712static int parse_options (char *options, struct super_block *sb,
713 unsigned long *inum, unsigned long *journal_devnum,
714 unsigned long *n_blocks_count, int is_remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715{
716 struct ext3_sb_info *sbi = EXT3_SB(sb);
717 char * p;
718 substring_t args[MAX_OPT_ARGS];
719 int data_opt = 0;
720 int option;
721#ifdef CONFIG_QUOTA
722 int qtype;
723 char *qname;
724#endif
725
726 if (!options)
727 return 1;
728
729 while ((p = strsep (&options, ",")) != NULL) {
730 int token;
731 if (!*p)
732 continue;
733
734 token = match_token(p, tokens, args);
735 switch (token) {
736 case Opt_bsd_df:
737 clear_opt (sbi->s_mount_opt, MINIX_DF);
738 break;
739 case Opt_minix_df:
740 set_opt (sbi->s_mount_opt, MINIX_DF);
741 break;
742 case Opt_grpid:
743 set_opt (sbi->s_mount_opt, GRPID);
744 break;
745 case Opt_nogrpid:
746 clear_opt (sbi->s_mount_opt, GRPID);
747 break;
748 case Opt_resuid:
749 if (match_int(&args[0], &option))
750 return 0;
751 sbi->s_resuid = option;
752 break;
753 case Opt_resgid:
754 if (match_int(&args[0], &option))
755 return 0;
756 sbi->s_resgid = option;
757 break;
758 case Opt_sb:
759 /* handled by get_sb_block() instead of here */
760 /* *sb_block = match_int(&args[0]); */
761 break;
762 case Opt_err_panic:
763 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
764 clear_opt (sbi->s_mount_opt, ERRORS_RO);
765 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
766 break;
767 case Opt_err_ro:
768 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
769 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
770 set_opt (sbi->s_mount_opt, ERRORS_RO);
771 break;
772 case Opt_err_cont:
773 clear_opt (sbi->s_mount_opt, ERRORS_RO);
774 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
775 set_opt (sbi->s_mount_opt, ERRORS_CONT);
776 break;
777 case Opt_nouid32:
778 set_opt (sbi->s_mount_opt, NO_UID32);
779 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 case Opt_nocheck:
781 clear_opt (sbi->s_mount_opt, CHECK);
782 break;
783 case Opt_debug:
784 set_opt (sbi->s_mount_opt, DEBUG);
785 break;
786 case Opt_oldalloc:
787 set_opt (sbi->s_mount_opt, OLDALLOC);
788 break;
789 case Opt_orlov:
790 clear_opt (sbi->s_mount_opt, OLDALLOC);
791 break;
792#ifdef CONFIG_EXT3_FS_XATTR
793 case Opt_user_xattr:
794 set_opt (sbi->s_mount_opt, XATTR_USER);
795 break;
796 case Opt_nouser_xattr:
797 clear_opt (sbi->s_mount_opt, XATTR_USER);
798 break;
799#else
800 case Opt_user_xattr:
801 case Opt_nouser_xattr:
802 printk("EXT3 (no)user_xattr options not supported\n");
803 break;
804#endif
805#ifdef CONFIG_EXT3_FS_POSIX_ACL
806 case Opt_acl:
807 set_opt(sbi->s_mount_opt, POSIX_ACL);
808 break;
809 case Opt_noacl:
810 clear_opt(sbi->s_mount_opt, POSIX_ACL);
811 break;
812#else
813 case Opt_acl:
814 case Opt_noacl:
815 printk("EXT3 (no)acl options not supported\n");
816 break;
817#endif
818 case Opt_reservation:
819 set_opt(sbi->s_mount_opt, RESERVATION);
820 break;
821 case Opt_noreservation:
822 clear_opt(sbi->s_mount_opt, RESERVATION);
823 break;
824 case Opt_journal_update:
825 /* @@@ FIXME */
826 /* Eventually we will want to be able to create
827 a journal file here. For now, only allow the
828 user to specify an existing inode to be the
829 journal file. */
830 if (is_remount) {
831 printk(KERN_ERR "EXT3-fs: cannot specify "
832 "journal on remount\n");
833 return 0;
834 }
835 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
836 break;
837 case Opt_journal_inum:
838 if (is_remount) {
839 printk(KERN_ERR "EXT3-fs: cannot specify "
840 "journal on remount\n");
841 return 0;
842 }
843 if (match_int(&args[0], &option))
844 return 0;
845 *inum = option;
846 break;
Johann Lombardi71b96252006-01-08 01:03:20 -0800847 case Opt_journal_dev:
848 if (is_remount) {
849 printk(KERN_ERR "EXT3-fs: cannot specify "
850 "journal on remount\n");
851 return 0;
852 }
853 if (match_int(&args[0], &option))
854 return 0;
855 *journal_devnum = option;
856 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 case Opt_noload:
858 set_opt (sbi->s_mount_opt, NOLOAD);
859 break;
860 case Opt_commit:
861 if (match_int(&args[0], &option))
862 return 0;
863 if (option < 0)
864 return 0;
865 if (option == 0)
866 option = JBD_DEFAULT_MAX_COMMIT_AGE;
867 sbi->s_commit_interval = HZ * option;
868 break;
869 case Opt_data_journal:
870 data_opt = EXT3_MOUNT_JOURNAL_DATA;
871 goto datacheck;
872 case Opt_data_ordered:
873 data_opt = EXT3_MOUNT_ORDERED_DATA;
874 goto datacheck;
875 case Opt_data_writeback:
876 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
877 datacheck:
878 if (is_remount) {
879 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
880 != data_opt) {
881 printk(KERN_ERR
882 "EXT3-fs: cannot change data "
883 "mode on remount\n");
884 return 0;
885 }
886 } else {
887 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
888 sbi->s_mount_opt |= data_opt;
889 }
890 break;
891#ifdef CONFIG_QUOTA
892 case Opt_usrjquota:
893 qtype = USRQUOTA;
894 goto set_qf_name;
895 case Opt_grpjquota:
896 qtype = GRPQUOTA;
897set_qf_name:
898 if (sb_any_quota_enabled(sb)) {
899 printk(KERN_ERR
900 "EXT3-fs: Cannot change journalled "
901 "quota options when quota turned on.\n");
902 return 0;
903 }
904 qname = match_strdup(&args[0]);
905 if (!qname) {
906 printk(KERN_ERR
907 "EXT3-fs: not enough memory for "
908 "storing quotafile name.\n");
909 return 0;
910 }
911 if (sbi->s_qf_names[qtype] &&
912 strcmp(sbi->s_qf_names[qtype], qname)) {
913 printk(KERN_ERR
914 "EXT3-fs: %s quota file already "
915 "specified.\n", QTYPE2NAME(qtype));
916 kfree(qname);
917 return 0;
918 }
919 sbi->s_qf_names[qtype] = qname;
920 if (strchr(sbi->s_qf_names[qtype], '/')) {
921 printk(KERN_ERR
922 "EXT3-fs: quotafile must be on "
923 "filesystem root.\n");
924 kfree(sbi->s_qf_names[qtype]);
925 sbi->s_qf_names[qtype] = NULL;
926 return 0;
927 }
Jan Kara1f545872005-06-23 22:01:04 -0700928 set_opt(sbi->s_mount_opt, QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 break;
930 case Opt_offusrjquota:
931 qtype = USRQUOTA;
932 goto clear_qf_name;
933 case Opt_offgrpjquota:
934 qtype = GRPQUOTA;
935clear_qf_name:
936 if (sb_any_quota_enabled(sb)) {
937 printk(KERN_ERR "EXT3-fs: Cannot change "
938 "journalled quota options when "
939 "quota turned on.\n");
940 return 0;
941 }
Jan Kara08c6a962005-07-12 13:58:28 -0700942 /*
943 * The space will be released later when all options
944 * are confirmed to be correct
945 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 sbi->s_qf_names[qtype] = NULL;
947 break;
948 case Opt_jqfmt_vfsold:
949 sbi->s_jquota_fmt = QFMT_VFS_OLD;
950 break;
951 case Opt_jqfmt_vfsv0:
952 sbi->s_jquota_fmt = QFMT_VFS_V0;
953 break;
Jan Kara1f545872005-06-23 22:01:04 -0700954 case Opt_quota:
Mark Bellon8fc27512005-09-06 15:16:54 -0700955 case Opt_usrquota:
Jan Kara1f545872005-06-23 22:01:04 -0700956 set_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -0700957 set_opt(sbi->s_mount_opt, USRQUOTA);
958 break;
959 case Opt_grpquota:
960 set_opt(sbi->s_mount_opt, QUOTA);
961 set_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -0700962 break;
963 case Opt_noquota:
964 if (sb_any_quota_enabled(sb)) {
965 printk(KERN_ERR "EXT3-fs: Cannot change quota "
966 "options when quota turned on.\n");
967 return 0;
968 }
969 clear_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -0700970 clear_opt(sbi->s_mount_opt, USRQUOTA);
971 clear_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -0700972 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973#else
Mark Bellon8fc27512005-09-06 15:16:54 -0700974 case Opt_quota:
975 case Opt_usrquota:
976 case Opt_grpquota:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 case Opt_usrjquota:
978 case Opt_grpjquota:
979 case Opt_offusrjquota:
980 case Opt_offgrpjquota:
981 case Opt_jqfmt_vfsold:
982 case Opt_jqfmt_vfsv0:
983 printk(KERN_ERR
984 "EXT3-fs: journalled quota options not "
985 "supported.\n");
986 break;
Jan Kara1f545872005-06-23 22:01:04 -0700987 case Opt_noquota:
988 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989#endif
990 case Opt_abort:
991 set_opt(sbi->s_mount_opt, ABORT);
992 break;
993 case Opt_barrier:
994 if (match_int(&args[0], &option))
995 return 0;
996 if (option)
997 set_opt(sbi->s_mount_opt, BARRIER);
998 else
999 clear_opt(sbi->s_mount_opt, BARRIER);
1000 break;
1001 case Opt_ignore:
1002 break;
1003 case Opt_resize:
Jan Kara08c6a962005-07-12 13:58:28 -07001004 if (!is_remount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 printk("EXT3-fs: resize option only available "
1006 "for remount\n");
1007 return 0;
1008 }
KAMBAROV, ZAURc7f17212005-06-28 20:45:11 -07001009 if (match_int(&args[0], &option) != 0)
1010 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 *n_blocks_count = option;
1012 break;
1013 case Opt_nobh:
1014 set_opt(sbi->s_mount_opt, NOBH);
1015 break;
1016 default:
1017 printk (KERN_ERR
1018 "EXT3-fs: Unrecognized mount option \"%s\" "
1019 "or missing value\n", p);
1020 return 0;
1021 }
1022 }
1023#ifdef CONFIG_QUOTA
Mark Bellon8fc27512005-09-06 15:16:54 -07001024 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1025 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1026 sbi->s_qf_names[USRQUOTA])
1027 clear_opt(sbi->s_mount_opt, USRQUOTA);
1028
1029 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1030 sbi->s_qf_names[GRPQUOTA])
1031 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1032
1033 if ((sbi->s_qf_names[USRQUOTA] &&
1034 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1035 (sbi->s_qf_names[GRPQUOTA] &&
1036 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1037 printk(KERN_ERR "EXT3-fs: old and new quota "
1038 "format mixing.\n");
1039 return 0;
1040 }
1041
1042 if (!sbi->s_jquota_fmt) {
1043 printk(KERN_ERR "EXT3-fs: journalled quota format "
1044 "not specified.\n");
1045 return 0;
1046 }
1047 } else {
1048 if (sbi->s_jquota_fmt) {
1049 printk(KERN_ERR "EXT3-fs: journalled quota format "
1050 "specified with no journalling "
1051 "enabled.\n");
1052 return 0;
1053 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 }
1055#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 return 1;
1057}
1058
1059static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1060 int read_only)
1061{
1062 struct ext3_sb_info *sbi = EXT3_SB(sb);
1063 int res = 0;
1064
1065 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1066 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1067 "forcing read-only mode\n");
1068 res = MS_RDONLY;
1069 }
1070 if (read_only)
1071 return res;
1072 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1073 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1074 "running e2fsck is recommended\n");
1075 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1076 printk (KERN_WARNING
1077 "EXT3-fs warning: mounting fs with errors, "
1078 "running e2fsck is recommended\n");
1079 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1080 le16_to_cpu(es->s_mnt_count) >=
1081 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1082 printk (KERN_WARNING
1083 "EXT3-fs warning: maximal mount count reached, "
1084 "running e2fsck is recommended\n");
1085 else if (le32_to_cpu(es->s_checkinterval) &&
1086 (le32_to_cpu(es->s_lastcheck) +
1087 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1088 printk (KERN_WARNING
1089 "EXT3-fs warning: checktime reached, "
1090 "running e2fsck is recommended\n");
1091#if 0
1092 /* @@@ We _will_ want to clear the valid bit if we find
1093 inconsistencies, to force a fsck at reboot. But for
1094 a plain journaled filesystem we can keep it set as
1095 valid forever! :) */
1096 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1097#endif
1098 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1099 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1100 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1101 es->s_mtime = cpu_to_le32(get_seconds());
1102 ext3_update_dynamic_rev(sb);
1103 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1104
1105 ext3_commit_super(sb, es, 1);
1106 if (test_opt(sb, DEBUG))
1107 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1108 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1109 sb->s_blocksize,
1110 sbi->s_groups_count,
1111 EXT3_BLOCKS_PER_GROUP(sb),
1112 EXT3_INODES_PER_GROUP(sb),
1113 sbi->s_mount_opt);
1114
1115 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1116 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1117 char b[BDEVNAME_SIZE];
1118
1119 printk("external journal on %s\n",
1120 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1121 } else {
1122 printk("internal journal\n");
1123 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 return res;
1125}
1126
1127/* Called at mount-time, super-block is locked */
1128static int ext3_check_descriptors (struct super_block * sb)
1129{
1130 struct ext3_sb_info *sbi = EXT3_SB(sb);
1131 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1132 struct ext3_group_desc * gdp = NULL;
1133 int desc_block = 0;
1134 int i;
1135
1136 ext3_debug ("Checking group descriptors");
1137
1138 for (i = 0; i < sbi->s_groups_count; i++)
1139 {
1140 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1141 gdp = (struct ext3_group_desc *)
1142 sbi->s_group_desc[desc_block++]->b_data;
1143 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1144 le32_to_cpu(gdp->bg_block_bitmap) >=
1145 block + EXT3_BLOCKS_PER_GROUP(sb))
1146 {
1147 ext3_error (sb, "ext3_check_descriptors",
1148 "Block bitmap for group %d"
1149 " not in group (block %lu)!",
1150 i, (unsigned long)
1151 le32_to_cpu(gdp->bg_block_bitmap));
1152 return 0;
1153 }
1154 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1155 le32_to_cpu(gdp->bg_inode_bitmap) >=
1156 block + EXT3_BLOCKS_PER_GROUP(sb))
1157 {
1158 ext3_error (sb, "ext3_check_descriptors",
1159 "Inode bitmap for group %d"
1160 " not in group (block %lu)!",
1161 i, (unsigned long)
1162 le32_to_cpu(gdp->bg_inode_bitmap));
1163 return 0;
1164 }
1165 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1166 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1167 block + EXT3_BLOCKS_PER_GROUP(sb))
1168 {
1169 ext3_error (sb, "ext3_check_descriptors",
1170 "Inode table for group %d"
1171 " not in group (block %lu)!",
1172 i, (unsigned long)
1173 le32_to_cpu(gdp->bg_inode_table));
1174 return 0;
1175 }
1176 block += EXT3_BLOCKS_PER_GROUP(sb);
1177 gdp++;
1178 }
1179
1180 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1181 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1182 return 1;
1183}
1184
1185
1186/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1187 * the superblock) which were deleted from all directories, but held open by
1188 * a process at the time of a crash. We walk the list and try to delete these
1189 * inodes at recovery time (only with a read-write filesystem).
1190 *
1191 * In order to keep the orphan inode chain consistent during traversal (in
1192 * case of crash during recovery), we link each inode into the superblock
1193 * orphan list_head and handle it the same way as an inode deletion during
1194 * normal operation (which journals the operations for us).
1195 *
1196 * We only do an iget() and an iput() on each inode, which is very safe if we
1197 * accidentally point at an in-use or already deleted inode. The worst that
1198 * can happen in this case is that we get a "bit already cleared" message from
1199 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1200 * e2fsck was run on this filesystem, and it must have already done the orphan
1201 * inode cleanup for us, so we can safely abort without any further action.
1202 */
1203static void ext3_orphan_cleanup (struct super_block * sb,
1204 struct ext3_super_block * es)
1205{
1206 unsigned int s_flags = sb->s_flags;
1207 int nr_orphans = 0, nr_truncates = 0;
1208#ifdef CONFIG_QUOTA
1209 int i;
1210#endif
1211 if (!es->s_last_orphan) {
1212 jbd_debug(4, "no orphan inodes to clean up\n");
1213 return;
1214 }
1215
1216 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1217 if (es->s_last_orphan)
1218 jbd_debug(1, "Errors on filesystem, "
1219 "clearing orphan list.\n");
1220 es->s_last_orphan = 0;
1221 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1222 return;
1223 }
1224
1225 if (s_flags & MS_RDONLY) {
1226 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1227 sb->s_id);
1228 sb->s_flags &= ~MS_RDONLY;
1229 }
1230#ifdef CONFIG_QUOTA
1231 /* Needed for iput() to work correctly and not trash data */
1232 sb->s_flags |= MS_ACTIVE;
1233 /* Turn on quotas so that they are updated correctly */
1234 for (i = 0; i < MAXQUOTAS; i++) {
1235 if (EXT3_SB(sb)->s_qf_names[i]) {
1236 int ret = ext3_quota_on_mount(sb, i);
1237 if (ret < 0)
1238 printk(KERN_ERR
1239 "EXT3-fs: Cannot turn on journalled "
1240 "quota: error %d\n", ret);
1241 }
1242 }
1243#endif
1244
1245 while (es->s_last_orphan) {
1246 struct inode *inode;
1247
1248 if (!(inode =
1249 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1250 es->s_last_orphan = 0;
1251 break;
1252 }
1253
1254 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1255 DQUOT_INIT(inode);
1256 if (inode->i_nlink) {
1257 printk(KERN_DEBUG
1258 "%s: truncating inode %ld to %Ld bytes\n",
1259 __FUNCTION__, inode->i_ino, inode->i_size);
1260 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1261 inode->i_ino, inode->i_size);
1262 ext3_truncate(inode);
1263 nr_truncates++;
1264 } else {
1265 printk(KERN_DEBUG
1266 "%s: deleting unreferenced inode %ld\n",
1267 __FUNCTION__, inode->i_ino);
1268 jbd_debug(2, "deleting unreferenced inode %ld\n",
1269 inode->i_ino);
1270 nr_orphans++;
1271 }
1272 iput(inode); /* The delete magic happens here! */
1273 }
1274
1275#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1276
1277 if (nr_orphans)
1278 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1279 sb->s_id, PLURAL(nr_orphans));
1280 if (nr_truncates)
1281 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1282 sb->s_id, PLURAL(nr_truncates));
1283#ifdef CONFIG_QUOTA
1284 /* Turn quotas off */
1285 for (i = 0; i < MAXQUOTAS; i++) {
1286 if (sb_dqopt(sb)->files[i])
1287 vfs_quota_off(sb, i);
1288 }
1289#endif
1290 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1291}
1292
1293#define log2(n) ffz(~(n))
1294
1295/*
1296 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1297 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1298 * We need to be 1 filesystem block less than the 2^32 sector limit.
1299 */
1300static loff_t ext3_max_size(int bits)
1301{
1302 loff_t res = EXT3_NDIR_BLOCKS;
1303 /* This constant is calculated to be the largest file size for a
1304 * dense, 4k-blocksize file such that the total number of
1305 * sectors in the file, including data and all indirect blocks,
1306 * does not exceed 2^32. */
1307 const loff_t upper_limit = 0x1ff7fffd000LL;
1308
1309 res += 1LL << (bits-2);
1310 res += 1LL << (2*(bits-2));
1311 res += 1LL << (3*(bits-2));
1312 res <<= bits;
1313 if (res > upper_limit)
1314 res = upper_limit;
1315 return res;
1316}
1317
1318static unsigned long descriptor_loc(struct super_block *sb,
1319 unsigned long logic_sb_block,
1320 int nr)
1321{
1322 struct ext3_sb_info *sbi = EXT3_SB(sb);
1323 unsigned long bg, first_data_block, first_meta_bg;
1324 int has_super = 0;
1325
1326 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1327 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1328
1329 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1330 nr < first_meta_bg)
1331 return (logic_sb_block + nr + 1);
1332 bg = sbi->s_desc_per_block * nr;
1333 if (ext3_bg_has_super(sb, bg))
1334 has_super = 1;
1335 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1336}
1337
1338
1339static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1340{
1341 struct buffer_head * bh;
1342 struct ext3_super_block *es = NULL;
1343 struct ext3_sb_info *sbi;
1344 unsigned long block;
1345 unsigned long sb_block = get_sb_block(&data);
1346 unsigned long logic_sb_block;
1347 unsigned long offset = 0;
1348 unsigned long journal_inum = 0;
Johann Lombardi71b96252006-01-08 01:03:20 -08001349 unsigned long journal_devnum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 unsigned long def_mount_opts;
1351 struct inode *root;
1352 int blocksize;
1353 int hblock;
1354 int db_count;
1355 int i;
1356 int needs_recovery;
1357 __le32 features;
1358
1359 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1360 if (!sbi)
1361 return -ENOMEM;
1362 sb->s_fs_info = sbi;
1363 memset(sbi, 0, sizeof(*sbi));
1364 sbi->s_mount_opt = 0;
1365 sbi->s_resuid = EXT3_DEF_RESUID;
1366 sbi->s_resgid = EXT3_DEF_RESGID;
1367
1368 unlock_kernel();
1369
1370 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1371 if (!blocksize) {
1372 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1373 goto out_fail;
1374 }
1375
1376 /*
1377 * The ext3 superblock will not be buffer aligned for other than 1kB
1378 * block sizes. We need to calculate the offset from buffer start.
1379 */
1380 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1381 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1382 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1383 } else {
1384 logic_sb_block = sb_block;
1385 }
1386
1387 if (!(bh = sb_bread(sb, logic_sb_block))) {
1388 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1389 goto out_fail;
1390 }
1391 /*
1392 * Note: s_es must be initialized as soon as possible because
1393 * some ext3 macro-instructions depend on its value
1394 */
1395 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1396 sbi->s_es = es;
1397 sb->s_magic = le16_to_cpu(es->s_magic);
1398 if (sb->s_magic != EXT3_SUPER_MAGIC)
1399 goto cantfind_ext3;
1400
1401 /* Set defaults before we parse the mount options */
1402 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1403 if (def_mount_opts & EXT3_DEFM_DEBUG)
1404 set_opt(sbi->s_mount_opt, DEBUG);
1405 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1406 set_opt(sbi->s_mount_opt, GRPID);
1407 if (def_mount_opts & EXT3_DEFM_UID16)
1408 set_opt(sbi->s_mount_opt, NO_UID32);
1409 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1410 set_opt(sbi->s_mount_opt, XATTR_USER);
1411 if (def_mount_opts & EXT3_DEFM_ACL)
1412 set_opt(sbi->s_mount_opt, POSIX_ACL);
1413 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1414 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1415 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1416 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1417 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1418 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1419
1420 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1421 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1422 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1423 set_opt(sbi->s_mount_opt, ERRORS_RO);
1424
1425 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1426 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1427
1428 set_opt(sbi->s_mount_opt, RESERVATION);
1429
Johann Lombardi71b96252006-01-08 01:03:20 -08001430 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1431 NULL, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 goto failed_mount;
1433
1434 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1435 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1436
1437 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1438 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1439 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1440 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1441 printk(KERN_WARNING
1442 "EXT3-fs warning: feature flags set on rev 0 fs, "
1443 "running e2fsck is recommended\n");
1444 /*
1445 * Check feature flags regardless of the revision level, since we
1446 * previously didn't change the revision level when setting the flags,
1447 * so there is a chance incompat flags are set on a rev 0 filesystem.
1448 */
1449 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1450 if (features) {
1451 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1452 "unsupported optional features (%x).\n",
1453 sb->s_id, le32_to_cpu(features));
1454 goto failed_mount;
1455 }
1456 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1457 if (!(sb->s_flags & MS_RDONLY) && features) {
1458 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1459 "unsupported optional features (%x).\n",
1460 sb->s_id, le32_to_cpu(features));
1461 goto failed_mount;
1462 }
1463 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1464
1465 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1466 blocksize > EXT3_MAX_BLOCK_SIZE) {
1467 printk(KERN_ERR
1468 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1469 blocksize, sb->s_id);
1470 goto failed_mount;
1471 }
1472
1473 hblock = bdev_hardsect_size(sb->s_bdev);
1474 if (sb->s_blocksize != blocksize) {
1475 /*
1476 * Make sure the blocksize for the filesystem is larger
1477 * than the hardware sectorsize for the machine.
1478 */
1479 if (blocksize < hblock) {
1480 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1481 "device blocksize %d.\n", blocksize, hblock);
1482 goto failed_mount;
1483 }
1484
1485 brelse (bh);
1486 sb_set_blocksize(sb, blocksize);
1487 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1488 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1489 bh = sb_bread(sb, logic_sb_block);
1490 if (!bh) {
1491 printk(KERN_ERR
1492 "EXT3-fs: Can't read superblock on 2nd try.\n");
1493 goto failed_mount;
1494 }
1495 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1496 sbi->s_es = es;
1497 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1498 printk (KERN_ERR
1499 "EXT3-fs: Magic mismatch, very weird !\n");
1500 goto failed_mount;
1501 }
1502 }
1503
1504 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1505
1506 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1507 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1508 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1509 } else {
1510 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1511 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1512 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1513 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1514 (sbi->s_inode_size > blocksize)) {
1515 printk (KERN_ERR
1516 "EXT3-fs: unsupported inode size: %d\n",
1517 sbi->s_inode_size);
1518 goto failed_mount;
1519 }
1520 }
1521 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1522 le32_to_cpu(es->s_log_frag_size);
1523 if (blocksize != sbi->s_frag_size) {
1524 printk(KERN_ERR
1525 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1526 sbi->s_frag_size, blocksize);
1527 goto failed_mount;
1528 }
1529 sbi->s_frags_per_block = 1;
1530 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1531 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1532 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1533 if (EXT3_INODE_SIZE(sb) == 0)
1534 goto cantfind_ext3;
1535 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1536 if (sbi->s_inodes_per_block == 0)
1537 goto cantfind_ext3;
1538 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1539 sbi->s_inodes_per_block;
1540 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1541 sbi->s_sbh = bh;
1542 sbi->s_mount_state = le16_to_cpu(es->s_state);
1543 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1544 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1545 for (i=0; i < 4; i++)
1546 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1547 sbi->s_def_hash_version = es->s_def_hash_version;
1548
1549 if (sbi->s_blocks_per_group > blocksize * 8) {
1550 printk (KERN_ERR
1551 "EXT3-fs: #blocks per group too big: %lu\n",
1552 sbi->s_blocks_per_group);
1553 goto failed_mount;
1554 }
1555 if (sbi->s_frags_per_group > blocksize * 8) {
1556 printk (KERN_ERR
1557 "EXT3-fs: #fragments per group too big: %lu\n",
1558 sbi->s_frags_per_group);
1559 goto failed_mount;
1560 }
1561 if (sbi->s_inodes_per_group > blocksize * 8) {
1562 printk (KERN_ERR
1563 "EXT3-fs: #inodes per group too big: %lu\n",
1564 sbi->s_inodes_per_group);
1565 goto failed_mount;
1566 }
1567
1568 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1569 goto cantfind_ext3;
1570 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1571 le32_to_cpu(es->s_first_data_block) +
1572 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1573 EXT3_BLOCKS_PER_GROUP(sb);
1574 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1575 EXT3_DESC_PER_BLOCK(sb);
1576 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1577 GFP_KERNEL);
1578 if (sbi->s_group_desc == NULL) {
1579 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1580 goto failed_mount;
1581 }
1582
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 bgl_lock_init(&sbi->s_blockgroup_lock);
1584
1585 for (i = 0; i < db_count; i++) {
1586 block = descriptor_loc(sb, logic_sb_block, i);
1587 sbi->s_group_desc[i] = sb_bread(sb, block);
1588 if (!sbi->s_group_desc[i]) {
1589 printk (KERN_ERR "EXT3-fs: "
1590 "can't read group descriptor %d\n", i);
1591 db_count = i;
1592 goto failed_mount2;
1593 }
1594 }
1595 if (!ext3_check_descriptors (sb)) {
1596 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1597 goto failed_mount2;
1598 }
1599 sbi->s_gdb_count = db_count;
1600 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1601 spin_lock_init(&sbi->s_next_gen_lock);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001602
1603 percpu_counter_init(&sbi->s_freeblocks_counter,
1604 ext3_count_free_blocks(sb));
1605 percpu_counter_init(&sbi->s_freeinodes_counter,
1606 ext3_count_free_inodes(sb));
1607 percpu_counter_init(&sbi->s_dirs_counter,
1608 ext3_count_dirs(sb));
1609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 /* per fileystem reservation list head & lock */
1611 spin_lock_init(&sbi->s_rsv_window_lock);
1612 sbi->s_rsv_window_root = RB_ROOT;
1613 /* Add a single, static dummy reservation to the start of the
1614 * reservation window list --- it gives us a placeholder for
1615 * append-at-start-of-list which makes the allocation logic
1616 * _much_ simpler. */
1617 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1618 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1619 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1620 sbi->s_rsv_window_head.rsv_goal_size = 0;
1621 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1622
1623 /*
1624 * set up enough so that it can read an inode
1625 */
1626 sb->s_op = &ext3_sops;
1627 sb->s_export_op = &ext3_export_ops;
1628 sb->s_xattr = ext3_xattr_handlers;
1629#ifdef CONFIG_QUOTA
1630 sb->s_qcop = &ext3_qctl_operations;
1631 sb->dq_op = &ext3_quota_operations;
1632#endif
1633 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1634
1635 sb->s_root = NULL;
1636
1637 needs_recovery = (es->s_last_orphan != 0 ||
1638 EXT3_HAS_INCOMPAT_FEATURE(sb,
1639 EXT3_FEATURE_INCOMPAT_RECOVER));
1640
1641 /*
1642 * The first inode we look at is the journal inode. Don't try
1643 * root first: it may be modified in the journal!
1644 */
1645 if (!test_opt(sb, NOLOAD) &&
1646 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
Johann Lombardi71b96252006-01-08 01:03:20 -08001647 if (ext3_load_journal(sb, es, journal_devnum))
Mingming Cao0216bfc2006-06-23 02:05:41 -07001648 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 } else if (journal_inum) {
1650 if (ext3_create_journal(sb, es, journal_inum))
Mingming Cao0216bfc2006-06-23 02:05:41 -07001651 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652 } else {
1653 if (!silent)
1654 printk (KERN_ERR
1655 "ext3: No journal on filesystem on %s\n",
1656 sb->s_id);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001657 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 }
1659
1660 /* We have now updated the journal if required, so we can
1661 * validate the data journaling mode. */
1662 switch (test_opt(sb, DATA_FLAGS)) {
1663 case 0:
1664 /* No mode set, assume a default based on the journal
1665 capabilities: ORDERED_DATA if the journal can
1666 cope, else JOURNAL_DATA */
1667 if (journal_check_available_features
1668 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1669 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1670 else
1671 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1672 break;
1673
1674 case EXT3_MOUNT_ORDERED_DATA:
1675 case EXT3_MOUNT_WRITEBACK_DATA:
1676 if (!journal_check_available_features
1677 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1678 printk(KERN_ERR "EXT3-fs: Journal does not support "
1679 "requested data journaling mode\n");
Mingming Cao0216bfc2006-06-23 02:05:41 -07001680 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 }
1682 default:
1683 break;
1684 }
1685
1686 if (test_opt(sb, NOBH)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1688 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1689 "its supported only with writeback mode\n");
1690 clear_opt(sbi->s_mount_opt, NOBH);
1691 }
1692 }
1693 /*
1694 * The journal_load will have done any necessary log recovery,
1695 * so we can safely mount the rest of the filesystem now.
1696 */
1697
1698 root = iget(sb, EXT3_ROOT_INO);
1699 sb->s_root = d_alloc_root(root);
1700 if (!sb->s_root) {
1701 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1702 iput(root);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001703 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 }
1705 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1706 dput(sb->s_root);
1707 sb->s_root = NULL;
1708 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
Mingming Cao0216bfc2006-06-23 02:05:41 -07001709 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710 }
1711
1712 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1713 /*
1714 * akpm: core read_super() calls in here with the superblock locked.
1715 * That deadlocks, because orphan cleanup needs to lock the superblock
1716 * in numerous places. Here we just pop the lock - it's relatively
1717 * harmless, because we are now ready to accept write_super() requests,
1718 * and aviro says that's the only reason for hanging onto the
1719 * superblock lock.
1720 */
1721 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1722 ext3_orphan_cleanup(sb, es);
1723 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1724 if (needs_recovery)
1725 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1726 ext3_mark_recovery_complete(sb, es);
1727 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1728 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1729 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1730 "writeback");
1731
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 lock_kernel();
1733 return 0;
1734
1735cantfind_ext3:
1736 if (!silent)
1737 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1738 sb->s_id);
1739 goto failed_mount;
1740
Mingming Cao0216bfc2006-06-23 02:05:41 -07001741failed_mount4:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742 journal_destroy(sbi->s_journal);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001743failed_mount3:
1744 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1745 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1746 percpu_counter_destroy(&sbi->s_dirs_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747failed_mount2:
1748 for (i = 0; i < db_count; i++)
1749 brelse(sbi->s_group_desc[i]);
1750 kfree(sbi->s_group_desc);
1751failed_mount:
1752#ifdef CONFIG_QUOTA
1753 for (i = 0; i < MAXQUOTAS; i++)
1754 kfree(sbi->s_qf_names[i]);
1755#endif
1756 ext3_blkdev_remove(sbi);
1757 brelse(bh);
1758out_fail:
1759 sb->s_fs_info = NULL;
1760 kfree(sbi);
1761 lock_kernel();
1762 return -EINVAL;
1763}
1764
1765/*
1766 * Setup any per-fs journal parameters now. We'll do this both on
1767 * initial mount, once the journal has been initialised but before we've
1768 * done any recovery; and again on any subsequent remount.
1769 */
1770static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1771{
1772 struct ext3_sb_info *sbi = EXT3_SB(sb);
1773
1774 if (sbi->s_commit_interval)
1775 journal->j_commit_interval = sbi->s_commit_interval;
1776 /* We could also set up an ext3-specific default for the commit
1777 * interval here, but for now we'll just fall back to the jbd
1778 * default. */
1779
1780 spin_lock(&journal->j_state_lock);
1781 if (test_opt(sb, BARRIER))
1782 journal->j_flags |= JFS_BARRIER;
1783 else
1784 journal->j_flags &= ~JFS_BARRIER;
1785 spin_unlock(&journal->j_state_lock);
1786}
1787
1788static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1789{
1790 struct inode *journal_inode;
1791 journal_t *journal;
1792
1793 /* First, test for the existence of a valid inode on disk. Bad
1794 * things happen if we iget() an unused inode, as the subsequent
1795 * iput() will try to delete it. */
1796
1797 journal_inode = iget(sb, journal_inum);
1798 if (!journal_inode) {
1799 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1800 return NULL;
1801 }
1802 if (!journal_inode->i_nlink) {
1803 make_bad_inode(journal_inode);
1804 iput(journal_inode);
1805 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1806 return NULL;
1807 }
1808
1809 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1810 journal_inode, journal_inode->i_size);
1811 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1812 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1813 iput(journal_inode);
1814 return NULL;
1815 }
1816
1817 journal = journal_init_inode(journal_inode);
1818 if (!journal) {
1819 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1820 iput(journal_inode);
1821 return NULL;
1822 }
1823 journal->j_private = sb;
1824 ext3_init_journal_params(sb, journal);
1825 return journal;
1826}
1827
1828static journal_t *ext3_get_dev_journal(struct super_block *sb,
1829 dev_t j_dev)
1830{
1831 struct buffer_head * bh;
1832 journal_t *journal;
1833 int start;
1834 int len;
1835 int hblock, blocksize;
1836 unsigned long sb_block;
1837 unsigned long offset;
1838 struct ext3_super_block * es;
1839 struct block_device *bdev;
1840
1841 bdev = ext3_blkdev_get(j_dev);
1842 if (bdev == NULL)
1843 return NULL;
1844
1845 if (bd_claim(bdev, sb)) {
1846 printk(KERN_ERR
1847 "EXT3: failed to claim external journal device.\n");
1848 blkdev_put(bdev);
1849 return NULL;
1850 }
1851
1852 blocksize = sb->s_blocksize;
1853 hblock = bdev_hardsect_size(bdev);
1854 if (blocksize < hblock) {
1855 printk(KERN_ERR
1856 "EXT3-fs: blocksize too small for journal device.\n");
1857 goto out_bdev;
1858 }
1859
1860 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1861 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1862 set_blocksize(bdev, blocksize);
1863 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1864 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1865 "external journal\n");
1866 goto out_bdev;
1867 }
1868
1869 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1870 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1871 !(le32_to_cpu(es->s_feature_incompat) &
1872 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1873 printk(KERN_ERR "EXT3-fs: external journal has "
1874 "bad superblock\n");
1875 brelse(bh);
1876 goto out_bdev;
1877 }
1878
1879 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1880 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1881 brelse(bh);
1882 goto out_bdev;
1883 }
1884
1885 len = le32_to_cpu(es->s_blocks_count);
1886 start = sb_block + 1;
1887 brelse(bh); /* we're done with the superblock */
1888
1889 journal = journal_init_dev(bdev, sb->s_bdev,
1890 start, len, blocksize);
1891 if (!journal) {
1892 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1893 goto out_bdev;
1894 }
1895 journal->j_private = sb;
1896 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1897 wait_on_buffer(journal->j_sb_buffer);
1898 if (!buffer_uptodate(journal->j_sb_buffer)) {
1899 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1900 goto out_journal;
1901 }
1902 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1903 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1904 "user (unsupported) - %d\n",
1905 be32_to_cpu(journal->j_superblock->s_nr_users));
1906 goto out_journal;
1907 }
1908 EXT3_SB(sb)->journal_bdev = bdev;
1909 ext3_init_journal_params(sb, journal);
1910 return journal;
1911out_journal:
1912 journal_destroy(journal);
1913out_bdev:
1914 ext3_blkdev_put(bdev);
1915 return NULL;
1916}
1917
Johann Lombardi71b96252006-01-08 01:03:20 -08001918static int ext3_load_journal(struct super_block *sb,
1919 struct ext3_super_block *es,
1920 unsigned long journal_devnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921{
1922 journal_t *journal;
1923 int journal_inum = le32_to_cpu(es->s_journal_inum);
Johann Lombardi71b96252006-01-08 01:03:20 -08001924 dev_t journal_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 int err = 0;
1926 int really_read_only;
1927
Johann Lombardi71b96252006-01-08 01:03:20 -08001928 if (journal_devnum &&
1929 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1930 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1931 "numbers have changed\n");
1932 journal_dev = new_decode_dev(journal_devnum);
1933 } else
1934 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1935
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936 really_read_only = bdev_read_only(sb->s_bdev);
1937
1938 /*
1939 * Are we loading a blank journal or performing recovery after a
1940 * crash? For recovery, we need to check in advance whether we
1941 * can get read-write access to the device.
1942 */
1943
1944 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1945 if (sb->s_flags & MS_RDONLY) {
1946 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1947 "required on readonly filesystem.\n");
1948 if (really_read_only) {
1949 printk(KERN_ERR "EXT3-fs: write access "
1950 "unavailable, cannot proceed.\n");
1951 return -EROFS;
1952 }
1953 printk (KERN_INFO "EXT3-fs: write access will "
1954 "be enabled during recovery.\n");
1955 }
1956 }
1957
1958 if (journal_inum && journal_dev) {
1959 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1960 "and inode journals!\n");
1961 return -EINVAL;
1962 }
1963
1964 if (journal_inum) {
1965 if (!(journal = ext3_get_journal(sb, journal_inum)))
1966 return -EINVAL;
1967 } else {
1968 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1969 return -EINVAL;
1970 }
1971
1972 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1973 err = journal_update_format(journal);
1974 if (err) {
1975 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1976 journal_destroy(journal);
1977 return err;
1978 }
1979 }
1980
1981 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1982 err = journal_wipe(journal, !really_read_only);
1983 if (!err)
1984 err = journal_load(journal);
1985
1986 if (err) {
1987 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1988 journal_destroy(journal);
1989 return err;
1990 }
1991
1992 EXT3_SB(sb)->s_journal = journal;
1993 ext3_clear_journal_err(sb, es);
Johann Lombardi71b96252006-01-08 01:03:20 -08001994
1995 if (journal_devnum &&
1996 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1997 es->s_journal_dev = cpu_to_le32(journal_devnum);
1998 sb->s_dirt = 1;
1999
2000 /* Make sure we flush the recovery flag to disk. */
2001 ext3_commit_super(sb, es, 1);
2002 }
2003
Linus Torvalds1da177e2005-04-16 15:20:36 -07002004 return 0;
2005}
2006
2007static int ext3_create_journal(struct super_block * sb,
2008 struct ext3_super_block * es,
2009 int journal_inum)
2010{
2011 journal_t *journal;
2012
2013 if (sb->s_flags & MS_RDONLY) {
2014 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2015 "create journal.\n");
2016 return -EROFS;
2017 }
2018
2019 if (!(journal = ext3_get_journal(sb, journal_inum)))
2020 return -EINVAL;
2021
2022 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2023 journal_inum);
2024
2025 if (journal_create(journal)) {
2026 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2027 journal_destroy(journal);
2028 return -EIO;
2029 }
2030
2031 EXT3_SB(sb)->s_journal = journal;
2032
2033 ext3_update_dynamic_rev(sb);
2034 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2035 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2036
2037 es->s_journal_inum = cpu_to_le32(journal_inum);
2038 sb->s_dirt = 1;
2039
2040 /* Make sure we flush the recovery flag to disk. */
2041 ext3_commit_super(sb, es, 1);
2042
2043 return 0;
2044}
2045
2046static void ext3_commit_super (struct super_block * sb,
2047 struct ext3_super_block * es,
2048 int sync)
2049{
2050 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2051
2052 if (!sbh)
2053 return;
2054 es->s_wtime = cpu_to_le32(get_seconds());
2055 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2056 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2057 BUFFER_TRACE(sbh, "marking dirty");
2058 mark_buffer_dirty(sbh);
2059 if (sync)
2060 sync_dirty_buffer(sbh);
2061}
2062
2063
2064/*
2065 * Have we just finished recovery? If so, and if we are mounting (or
2066 * remounting) the filesystem readonly, then we will end up with a
2067 * consistent fs on disk. Record that fact.
2068 */
2069static void ext3_mark_recovery_complete(struct super_block * sb,
2070 struct ext3_super_block * es)
2071{
2072 journal_t *journal = EXT3_SB(sb)->s_journal;
2073
2074 journal_lock_updates(journal);
2075 journal_flush(journal);
2076 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2077 sb->s_flags & MS_RDONLY) {
2078 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2079 sb->s_dirt = 0;
2080 ext3_commit_super(sb, es, 1);
2081 }
2082 journal_unlock_updates(journal);
2083}
2084
2085/*
2086 * If we are mounting (or read-write remounting) a filesystem whose journal
2087 * has recorded an error from a previous lifetime, move that error to the
2088 * main filesystem now.
2089 */
2090static void ext3_clear_journal_err(struct super_block * sb,
2091 struct ext3_super_block * es)
2092{
2093 journal_t *journal;
2094 int j_errno;
2095 const char *errstr;
2096
2097 journal = EXT3_SB(sb)->s_journal;
2098
2099 /*
2100 * Now check for any error status which may have been recorded in the
2101 * journal by a prior ext3_error() or ext3_abort()
2102 */
2103
2104 j_errno = journal_errno(journal);
2105 if (j_errno) {
2106 char nbuf[16];
2107
2108 errstr = ext3_decode_error(sb, j_errno, nbuf);
2109 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2110 "from previous mount: %s", errstr);
2111 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2112 "filesystem check.");
2113
2114 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2115 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2116 ext3_commit_super (sb, es, 1);
2117
2118 journal_clear_err(journal);
2119 }
2120}
2121
2122/*
2123 * Force the running and committing transactions to commit,
2124 * and wait on the commit.
2125 */
2126int ext3_force_commit(struct super_block *sb)
2127{
2128 journal_t *journal;
2129 int ret;
2130
2131 if (sb->s_flags & MS_RDONLY)
2132 return 0;
2133
2134 journal = EXT3_SB(sb)->s_journal;
2135 sb->s_dirt = 0;
2136 ret = ext3_journal_force_commit(journal);
2137 return ret;
2138}
2139
2140/*
2141 * Ext3 always journals updates to the superblock itself, so we don't
2142 * have to propagate any other updates to the superblock on disk at this
2143 * point. Just start an async writeback to get the buffers on their way
2144 * to the disk.
2145 *
2146 * This implicitly triggers the writebehind on sync().
2147 */
2148
2149static void ext3_write_super (struct super_block * sb)
2150{
Ingo Molnar7892f2f2006-01-09 15:59:25 -08002151 if (mutex_trylock(&sb->s_lock) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152 BUG();
2153 sb->s_dirt = 0;
2154}
2155
2156static int ext3_sync_fs(struct super_block *sb, int wait)
2157{
2158 tid_t target;
2159
2160 sb->s_dirt = 0;
2161 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2162 if (wait)
2163 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2164 }
2165 return 0;
2166}
2167
2168/*
2169 * LVM calls this function before a (read-only) snapshot is created. This
2170 * gives us a chance to flush the journal completely and mark the fs clean.
2171 */
2172static void ext3_write_super_lockfs(struct super_block *sb)
2173{
2174 sb->s_dirt = 0;
2175
2176 if (!(sb->s_flags & MS_RDONLY)) {
2177 journal_t *journal = EXT3_SB(sb)->s_journal;
2178
2179 /* Now we set up the journal barrier. */
2180 journal_lock_updates(journal);
2181 journal_flush(journal);
2182
2183 /* Journal blocked and flushed, clear needs_recovery flag. */
2184 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2185 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2186 }
2187}
2188
2189/*
2190 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2191 * flag here, even though the filesystem is not technically dirty yet.
2192 */
2193static void ext3_unlockfs(struct super_block *sb)
2194{
2195 if (!(sb->s_flags & MS_RDONLY)) {
2196 lock_super(sb);
2197 /* Reser the needs_recovery flag before the fs is unlocked. */
2198 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2199 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2200 unlock_super(sb);
2201 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2202 }
2203}
2204
2205static int ext3_remount (struct super_block * sb, int * flags, char * data)
2206{
2207 struct ext3_super_block * es;
2208 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 unsigned long n_blocks_count = 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002210 unsigned long old_sb_flags;
2211 struct ext3_mount_options old_opts;
2212 int err;
2213#ifdef CONFIG_QUOTA
2214 int i;
2215#endif
2216
2217 /* Store the original options */
2218 old_sb_flags = sb->s_flags;
2219 old_opts.s_mount_opt = sbi->s_mount_opt;
2220 old_opts.s_resuid = sbi->s_resuid;
2221 old_opts.s_resgid = sbi->s_resgid;
2222 old_opts.s_commit_interval = sbi->s_commit_interval;
2223#ifdef CONFIG_QUOTA
2224 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2225 for (i = 0; i < MAXQUOTAS; i++)
2226 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2227#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228
2229 /*
2230 * Allow the "check" option to be passed as a remount option.
2231 */
Johann Lombardi71b96252006-01-08 01:03:20 -08002232 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002233 err = -EINVAL;
2234 goto restore_opts;
2235 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236
2237 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2238 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2239
2240 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2241 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2242
2243 es = sbi->s_es;
2244
2245 ext3_init_journal_params(sb, sbi->s_journal);
2246
2247 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2248 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002249 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2250 err = -EROFS;
2251 goto restore_opts;
2252 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002253
2254 if (*flags & MS_RDONLY) {
2255 /*
2256 * First of all, the unconditional stuff we have to do
2257 * to disable replay of the journal when we next remount
2258 */
2259 sb->s_flags |= MS_RDONLY;
2260
2261 /*
2262 * OK, test if we are remounting a valid rw partition
2263 * readonly, and if so set the rdonly flag and then
2264 * mark the partition as valid again.
2265 */
2266 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2267 (sbi->s_mount_state & EXT3_VALID_FS))
2268 es->s_state = cpu_to_le16(sbi->s_mount_state);
2269
2270 ext3_mark_recovery_complete(sb, es);
2271 } else {
2272 __le32 ret;
2273 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2274 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2275 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2276 "remount RDWR because of unsupported "
2277 "optional features (%x).\n",
2278 sb->s_id, le32_to_cpu(ret));
Jan Kara08c6a962005-07-12 13:58:28 -07002279 err = -EROFS;
2280 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281 }
2282 /*
2283 * Mounting a RDONLY partition read-write, so reread
2284 * and store the current valid flag. (It may have
2285 * been changed by e2fsck since we originally mounted
2286 * the partition.)
2287 */
2288 ext3_clear_journal_err(sb, es);
2289 sbi->s_mount_state = le16_to_cpu(es->s_state);
Jan Kara08c6a962005-07-12 13:58:28 -07002290 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2291 err = ret;
2292 goto restore_opts;
2293 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 if (!ext3_setup_super (sb, es, 0))
2295 sb->s_flags &= ~MS_RDONLY;
2296 }
2297 }
Jan Kara08c6a962005-07-12 13:58:28 -07002298#ifdef CONFIG_QUOTA
2299 /* Release old quota file names */
2300 for (i = 0; i < MAXQUOTAS; i++)
2301 if (old_opts.s_qf_names[i] &&
2302 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2303 kfree(old_opts.s_qf_names[i]);
2304#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305 return 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002306restore_opts:
2307 sb->s_flags = old_sb_flags;
2308 sbi->s_mount_opt = old_opts.s_mount_opt;
2309 sbi->s_resuid = old_opts.s_resuid;
2310 sbi->s_resgid = old_opts.s_resgid;
2311 sbi->s_commit_interval = old_opts.s_commit_interval;
2312#ifdef CONFIG_QUOTA
2313 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2314 for (i = 0; i < MAXQUOTAS; i++) {
2315 if (sbi->s_qf_names[i] &&
2316 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2317 kfree(sbi->s_qf_names[i]);
2318 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2319 }
2320#endif
2321 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322}
2323
David Howells726c3342006-06-23 02:02:58 -07002324static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325{
David Howells726c3342006-06-23 02:02:58 -07002326 struct super_block *sb = dentry->d_sb;
Alex Tomas09fe3162006-03-24 03:16:16 -08002327 struct ext3_sb_info *sbi = EXT3_SB(sb);
2328 struct ext3_super_block *es = sbi->s_es;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329 unsigned long overhead;
2330 int i;
2331
2332 if (test_opt (sb, MINIX_DF))
2333 overhead = 0;
2334 else {
2335 unsigned long ngroups;
2336 ngroups = EXT3_SB(sb)->s_groups_count;
2337 smp_rmb();
2338
2339 /*
2340 * Compute the overhead (FS structures)
2341 */
2342
2343 /*
2344 * All of the blocks before first_data_block are
2345 * overhead
2346 */
2347 overhead = le32_to_cpu(es->s_first_data_block);
2348
2349 /*
2350 * Add the overhead attributed to the superblock and
2351 * block group descriptors. If the sparse superblocks
2352 * feature is turned on, then not all groups have this.
2353 */
2354 for (i = 0; i < ngroups; i++) {
2355 overhead += ext3_bg_has_super(sb, i) +
2356 ext3_bg_num_gdb(sb, i);
2357 cond_resched();
2358 }
2359
2360 /*
2361 * Every block group has an inode bitmap, a block
2362 * bitmap, and an inode table.
2363 */
2364 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2365 }
2366
2367 buf->f_type = EXT3_SUPER_MAGIC;
2368 buf->f_bsize = sb->s_blocksize;
2369 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
Alex Tomas09fe3162006-03-24 03:16:16 -08002370 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2372 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2373 buf->f_bavail = 0;
2374 buf->f_files = le32_to_cpu(es->s_inodes_count);
Alex Tomas09fe3162006-03-24 03:16:16 -08002375 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002376 buf->f_namelen = EXT3_NAME_LEN;
2377 return 0;
2378}
2379
2380/* Helper function for writing quotas on sync - we need to start transaction before quota file
2381 * is locked for write. Otherwise the are possible deadlocks:
2382 * Process 1 Process 2
2383 * ext3_create() quota_sync()
2384 * journal_start() write_dquot()
Ingo Molnard3be9152006-03-23 03:00:29 -08002385 * DQUOT_INIT() down(dqio_mutex)
2386 * down(dqio_mutex) journal_start()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002387 *
2388 */
2389
2390#ifdef CONFIG_QUOTA
2391
2392static inline struct inode *dquot_to_inode(struct dquot *dquot)
2393{
2394 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2395}
2396
2397static int ext3_dquot_initialize(struct inode *inode, int type)
2398{
2399 handle_t *handle;
2400 int ret, err;
2401
2402 /* We may create quota structure so we need to reserve enough blocks */
Jan Kara1f545872005-06-23 22:01:04 -07002403 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002404 if (IS_ERR(handle))
2405 return PTR_ERR(handle);
2406 ret = dquot_initialize(inode, type);
2407 err = ext3_journal_stop(handle);
2408 if (!ret)
2409 ret = err;
2410 return ret;
2411}
2412
2413static int ext3_dquot_drop(struct inode *inode)
2414{
2415 handle_t *handle;
2416 int ret, err;
2417
2418 /* We may delete quota structure so we need to reserve enough blocks */
Jan Kara1f545872005-06-23 22:01:04 -07002419 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002420 if (IS_ERR(handle))
2421 return PTR_ERR(handle);
2422 ret = dquot_drop(inode);
2423 err = ext3_journal_stop(handle);
2424 if (!ret)
2425 ret = err;
2426 return ret;
2427}
2428
2429static int ext3_write_dquot(struct dquot *dquot)
2430{
2431 int ret, err;
2432 handle_t *handle;
2433 struct inode *inode;
2434
2435 inode = dquot_to_inode(dquot);
2436 handle = ext3_journal_start(inode,
Jan Kara1f545872005-06-23 22:01:04 -07002437 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438 if (IS_ERR(handle))
2439 return PTR_ERR(handle);
2440 ret = dquot_commit(dquot);
2441 err = ext3_journal_stop(handle);
2442 if (!ret)
2443 ret = err;
2444 return ret;
2445}
2446
2447static int ext3_acquire_dquot(struct dquot *dquot)
2448{
2449 int ret, err;
2450 handle_t *handle;
2451
2452 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002453 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002454 if (IS_ERR(handle))
2455 return PTR_ERR(handle);
2456 ret = dquot_acquire(dquot);
2457 err = ext3_journal_stop(handle);
2458 if (!ret)
2459 ret = err;
2460 return ret;
2461}
2462
2463static int ext3_release_dquot(struct dquot *dquot)
2464{
2465 int ret, err;
2466 handle_t *handle;
2467
2468 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002469 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470 if (IS_ERR(handle))
2471 return PTR_ERR(handle);
2472 ret = dquot_release(dquot);
2473 err = ext3_journal_stop(handle);
2474 if (!ret)
2475 ret = err;
2476 return ret;
2477}
2478
2479static int ext3_mark_dquot_dirty(struct dquot *dquot)
2480{
2481 /* Are we journalling quotas? */
2482 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2483 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2484 dquot_mark_dquot_dirty(dquot);
2485 return ext3_write_dquot(dquot);
2486 } else {
2487 return dquot_mark_dquot_dirty(dquot);
2488 }
2489}
2490
2491static int ext3_write_info(struct super_block *sb, int type)
2492{
2493 int ret, err;
2494 handle_t *handle;
2495
2496 /* Data block + inode block */
2497 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2498 if (IS_ERR(handle))
2499 return PTR_ERR(handle);
2500 ret = dquot_commit_info(sb, type);
2501 err = ext3_journal_stop(handle);
2502 if (!ret)
2503 ret = err;
2504 return ret;
2505}
2506
2507/*
2508 * Turn on quotas during mount time - we need to find
2509 * the quota file and such...
2510 */
2511static int ext3_quota_on_mount(struct super_block *sb, int type)
2512{
Christoph Hellwig84de8562005-06-23 00:09:16 -07002513 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2514 EXT3_SB(sb)->s_jquota_fmt, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515}
2516
2517/*
2518 * Standard function to be called on quota_on
2519 */
2520static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2521 char *path)
2522{
2523 int err;
2524 struct nameidata nd;
2525
Jan Kara1f545872005-06-23 22:01:04 -07002526 if (!test_opt(sb, QUOTA))
2527 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528 /* Not journalling quota? */
2529 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2530 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2531 return vfs_quota_on(sb, type, format_id, path);
2532 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2533 if (err)
2534 return err;
2535 /* Quotafile not on the same filesystem? */
2536 if (nd.mnt->mnt_sb != sb) {
2537 path_release(&nd);
2538 return -EXDEV;
2539 }
2540 /* Quotafile not of fs root? */
2541 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2542 printk(KERN_WARNING
2543 "EXT3-fs: Quota file not on filesystem root. "
2544 "Journalled quota will not work.\n");
2545 path_release(&nd);
2546 return vfs_quota_on(sb, type, format_id, path);
2547}
2548
2549/* Read data from quotafile - avoid pagecache and such because we cannot afford
2550 * acquiring the locks... As quota files are never truncated and quota code
2551 * itself serializes the operations (and noone else should touch the files)
2552 * we don't have to be afraid of races */
2553static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2554 size_t len, loff_t off)
2555{
2556 struct inode *inode = sb_dqopt(sb)->files[type];
2557 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2558 int err = 0;
2559 int offset = off & (sb->s_blocksize - 1);
2560 int tocopy;
2561 size_t toread;
2562 struct buffer_head *bh;
2563 loff_t i_size = i_size_read(inode);
2564
2565 if (off > i_size)
2566 return 0;
2567 if (off+len > i_size)
2568 len = i_size-off;
2569 toread = len;
2570 while (toread > 0) {
2571 tocopy = sb->s_blocksize - offset < toread ?
2572 sb->s_blocksize - offset : toread;
2573 bh = ext3_bread(NULL, inode, blk, 0, &err);
2574 if (err)
2575 return err;
2576 if (!bh) /* A hole? */
2577 memset(data, 0, tocopy);
2578 else
2579 memcpy(data, bh->b_data+offset, tocopy);
2580 brelse(bh);
2581 offset = 0;
2582 toread -= tocopy;
2583 data += tocopy;
2584 blk++;
2585 }
2586 return len;
2587}
2588
2589/* Write to quotafile (we know the transaction is already started and has
2590 * enough credits) */
2591static ssize_t ext3_quota_write(struct super_block *sb, int type,
2592 const char *data, size_t len, loff_t off)
2593{
2594 struct inode *inode = sb_dqopt(sb)->files[type];
2595 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2596 int err = 0;
2597 int offset = off & (sb->s_blocksize - 1);
2598 int tocopy;
2599 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2600 size_t towrite = len;
2601 struct buffer_head *bh;
2602 handle_t *handle = journal_current_handle();
2603
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002604 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 while (towrite > 0) {
2606 tocopy = sb->s_blocksize - offset < towrite ?
2607 sb->s_blocksize - offset : towrite;
2608 bh = ext3_bread(handle, inode, blk, 1, &err);
2609 if (!bh)
2610 goto out;
2611 if (journal_quota) {
2612 err = ext3_journal_get_write_access(handle, bh);
2613 if (err) {
2614 brelse(bh);
2615 goto out;
2616 }
2617 }
2618 lock_buffer(bh);
2619 memcpy(bh->b_data+offset, data, tocopy);
2620 flush_dcache_page(bh->b_page);
2621 unlock_buffer(bh);
2622 if (journal_quota)
2623 err = ext3_journal_dirty_metadata(handle, bh);
2624 else {
2625 /* Always do at least ordered writes for quotas */
2626 err = ext3_journal_dirty_data(handle, bh);
2627 mark_buffer_dirty(bh);
2628 }
2629 brelse(bh);
2630 if (err)
2631 goto out;
2632 offset = 0;
2633 towrite -= tocopy;
2634 data += tocopy;
2635 blk++;
2636 }
2637out:
2638 if (len == towrite)
2639 return err;
2640 if (inode->i_size < off+len-towrite) {
2641 i_size_write(inode, off+len-towrite);
2642 EXT3_I(inode)->i_disksize = inode->i_size;
2643 }
2644 inode->i_version++;
2645 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2646 ext3_mark_inode_dirty(handle, inode);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002647 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648 return len - towrite;
2649}
2650
2651#endif
2652
David Howells454e2392006-06-23 02:02:57 -07002653static int ext3_get_sb(struct file_system_type *fs_type,
2654 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655{
David Howells454e2392006-06-23 02:02:57 -07002656 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002657}
2658
2659static struct file_system_type ext3_fs_type = {
2660 .owner = THIS_MODULE,
2661 .name = "ext3",
2662 .get_sb = ext3_get_sb,
2663 .kill_sb = kill_block_super,
2664 .fs_flags = FS_REQUIRES_DEV,
2665};
2666
2667static int __init init_ext3_fs(void)
2668{
2669 int err = init_ext3_xattr();
2670 if (err)
2671 return err;
2672 err = init_inodecache();
2673 if (err)
2674 goto out1;
2675 err = register_filesystem(&ext3_fs_type);
2676 if (err)
2677 goto out;
2678 return 0;
2679out:
2680 destroy_inodecache();
2681out1:
2682 exit_ext3_xattr();
2683 return err;
2684}
2685
2686static void __exit exit_ext3_fs(void)
2687{
2688 unregister_filesystem(&ext3_fs_type);
2689 destroy_inodecache();
2690 exit_ext3_xattr();
2691}
2692
2693MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2694MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2695MODULE_LICENSE("GPL");
2696module_init(init_ext3_fs)
2697module_exit(exit_ext3_fs)