blob: 69a59d4580e995575bfd72942651100d8d76644f [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
23#include <linux/jbd.h>
24#include <linux/ext3_fs.h>
25#include <linux/ext3_jbd.h>
26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
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>
Mark Bellon8fc27512005-09-06 15:16:54 -070037#include <linux/seq_file.h>
Ben Dooks381be252005-10-30 15:02:56 -080038
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/uaccess.h>
Ben Dooks381be252005-10-30 15:02:56 -080040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xattr.h"
42#include "acl.h"
Ben Dooks381be252005-10-30 15:02:56 -080043#include "namei.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Johann Lombardi71b96252006-01-08 01:03:20 -080045static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
46 unsigned long journal_devnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
Eric Sandeeneee194e2006-09-27 01:49:30 -070048 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049static void ext3_commit_super (struct super_block * sb,
50 struct ext3_super_block * es,
51 int sync);
52static void ext3_mark_recovery_complete(struct super_block * sb,
53 struct ext3_super_block * es);
54static void ext3_clear_journal_err(struct super_block * sb,
55 struct ext3_super_block * es);
56static int ext3_sync_fs(struct super_block *sb, int wait);
57static const char *ext3_decode_error(struct super_block * sb, int errno,
58 char nbuf[16]);
59static int ext3_remount (struct super_block * sb, int * flags, char * data);
David Howells726c3342006-06-23 02:02:58 -070060static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static void ext3_unlockfs(struct super_block *sb);
62static void ext3_write_super (struct super_block * sb);
63static void ext3_write_super_lockfs(struct super_block *sb);
64
Mingming Caoae6ddcc2006-09-27 01:49:27 -070065/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 * Wrappers for journal_start/end.
67 *
68 * The only special thing we need to do here is to make sure that all
69 * journal_end calls result in the superblock being marked dirty, so
70 * that sync() will call the filesystem's write_super callback if
Mingming Caoae6ddcc2006-09-27 01:49:27 -070071 * appropriate.
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 */
73handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
74{
75 journal_t *journal;
76
77 if (sb->s_flags & MS_RDONLY)
78 return ERR_PTR(-EROFS);
79
80 /* Special case here: if the journal has aborted behind our
81 * backs (eg. EIO in the commit thread), then we still need to
82 * take the FS itself readonly cleanly. */
83 journal = EXT3_SB(sb)->s_journal;
84 if (is_journal_aborted(journal)) {
85 ext3_abort(sb, __FUNCTION__,
86 "Detected aborted journal");
87 return ERR_PTR(-EROFS);
88 }
89
90 return journal_start(journal, nblocks);
91}
92
Mingming Caoae6ddcc2006-09-27 01:49:27 -070093/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 * The only special thing we need to do here is to make sure that all
95 * journal_stop calls result in the superblock being marked dirty, so
96 * that sync() will call the filesystem's write_super callback if
Mingming Caoae6ddcc2006-09-27 01:49:27 -070097 * appropriate.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 */
99int __ext3_journal_stop(const char *where, handle_t *handle)
100{
101 struct super_block *sb;
102 int err;
103 int rc;
104
105 sb = handle->h_transaction->t_journal->j_private;
106 err = handle->h_err;
107 rc = journal_stop(handle);
108
109 if (!err)
110 err = rc;
111 if (err)
112 __ext3_std_error(sb, where, err);
113 return err;
114}
115
116void ext3_journal_abort_handle(const char *caller, const char *err_fn,
117 struct buffer_head *bh, handle_t *handle, int err)
118{
119 char nbuf[16];
120 const char *errstr = ext3_decode_error(NULL, err, nbuf);
121
122 if (bh)
123 BUFFER_TRACE(bh, "abort");
124
125 if (!handle->h_err)
126 handle->h_err = err;
127
128 if (is_handle_aborted(handle))
129 return;
130
131 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
132 caller, errstr, err_fn);
133
134 journal_abort_handle(handle);
135}
136
137/* Deal with the reporting of failure conditions on a filesystem such as
138 * inconsistencies detected or read IO failures.
139 *
140 * On ext2, we can store the error state of the filesystem in the
141 * superblock. That is not possible on ext3, because we may have other
142 * write ordering constraints on the superblock which prevent us from
143 * writing it out straight away; and given that the journal is about to
144 * be aborted, we can't rely on the current, or future, transactions to
145 * write out the superblock safely.
146 *
147 * We'll just use the journal_abort() error code to record an error in
148 * the journal instead. On recovery, the journal will compain about
149 * that error until we've noted it down and cleared it.
150 */
151
152static void ext3_handle_error(struct super_block *sb)
153{
154 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
155
156 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
157 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
158
159 if (sb->s_flags & MS_RDONLY)
160 return;
161
Vasily Averin7543fc72006-09-27 01:49:33 -0700162 if (!test_opt (sb, ERRORS_CONT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 journal_t *journal = EXT3_SB(sb)->s_journal;
164
165 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
166 if (journal)
167 journal_abort(journal, -EIO);
168 }
Vasily Averin7543fc72006-09-27 01:49:33 -0700169 if (test_opt (sb, ERRORS_RO)) {
170 printk (KERN_CRIT "Remounting filesystem read-only\n");
171 sb->s_flags |= MS_RDONLY;
172 }
173 ext3_commit_super(sb, es, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (test_opt(sb, ERRORS_PANIC))
175 panic("EXT3-fs (device %s): panic forced after error\n",
176 sb->s_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
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
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700373 printk(KERN_ERR "sb orphan head is %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 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 " "
Eric Sandeeneee194e2006-09-27 01:49:30 -0700380 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 inode->i_sb->s_id, inode->i_ino, inode,
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700382 inode->i_mode, inode->i_nlink,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 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
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700423 invalidate_bdev(sb->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 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);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700431 invalidate_bdev(sbi->journal_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 ext3_blkdev_remove(sbi);
433 }
434 sb->s_fs_info = NULL;
435 kfree(sbi);
436 return;
437}
438
Christoph Lametere18b8902006-12-06 20:33:20 -0800439static struct kmem_cache *ext3_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
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
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800448 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 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{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700462 if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
463 printk("EXT3 Inode %p: orphan list check failed!\n",
464 EXT3_I(inode));
465 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
466 EXT3_I(inode), sizeof(struct ext3_inode_info),
467 false);
468 dump_stack();
469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
471}
472
Christoph Lametere18b8902006-12-06 20:33:20 -0800473static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
476
Christoph Lametera35afb82007-05-16 22:10:57 -0700477 INIT_LIST_HEAD(&ei->i_orphan);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478#ifdef CONFIG_EXT3_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700479 init_rwsem(&ei->xattr_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480#endif
Christoph Lametera35afb82007-05-16 22:10:57 -0700481 mutex_init(&ei->truncate_mutex);
482 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485static int init_inodecache(void)
486{
487 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
488 sizeof(struct ext3_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800489 0, (SLAB_RECLAIM_ACCOUNT|
490 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 init_once, NULL);
492 if (ext3_inode_cachep == NULL)
493 return -ENOMEM;
494 return 0;
495}
496
497static void destroy_inodecache(void)
498{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700499 kmem_cache_destroy(ext3_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500}
501
502static void ext3_clear_inode(struct inode *inode)
503{
504 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
505#ifdef CONFIG_EXT3_FS_POSIX_ACL
Andrew Mortone6022602006-06-23 02:05:32 -0700506 if (EXT3_I(inode)->i_acl &&
507 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
508 posix_acl_release(EXT3_I(inode)->i_acl);
509 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
510 }
511 if (EXT3_I(inode)->i_default_acl &&
512 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
513 posix_acl_release(EXT3_I(inode)->i_default_acl);
514 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
515 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516#endif
517 ext3_discard_reservation(inode);
518 EXT3_I(inode)->i_block_alloc_info = NULL;
Andrew Mortone6022602006-06-23 02:05:32 -0700519 if (unlikely(rsv))
520 kfree(rsv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521}
522
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200523static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
Mark Bellon8fc27512005-09-06 15:16:54 -0700524{
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200525#if defined(CONFIG_QUOTA)
OGAWA Hirofumi275abf52005-09-22 21:44:03 -0700526 struct ext3_sb_info *sbi = EXT3_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Mark Bellon8fc27512005-09-06 15:16:54 -0700528 if (sbi->s_jquota_fmt)
529 seq_printf(seq, ",jqfmt=%s",
530 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
531
532 if (sbi->s_qf_names[USRQUOTA])
533 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
534
535 if (sbi->s_qf_names[GRPQUOTA])
536 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
537
538 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
539 seq_puts(seq, ",usrquota");
540
541 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
542 seq_puts(seq, ",grpquota");
543#endif
Peter Osterlund6cd37cd2005-10-28 20:23:39 +0200544}
545
546static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
547{
548 struct super_block *sb = vfs->mnt_sb;
549
550 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
551 seq_puts(seq, ",data=journal");
552 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
553 seq_puts(seq, ",data=ordered");
554 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
555 seq_puts(seq, ",data=writeback");
556
557 ext3_show_quota_options(seq, sb);
Mark Bellon8fc27512005-09-06 15:16:54 -0700558
559 return 0;
560}
561
NeilBrownfdb36672006-09-16 12:15:38 -0700562
563static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
564{
565 __u32 *objp = vobjp;
566 unsigned long ino = objp[0];
567 __u32 generation = objp[1];
568 struct inode *inode;
569 struct dentry *result;
570
571 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
572 return ERR_PTR(-ESTALE);
573 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
574 return ERR_PTR(-ESTALE);
575
576 /* iget isn't really right if the inode is currently unallocated!!
577 *
578 * ext3_read_inode will return a bad_inode if the inode had been
579 * deleted, so we should be safe.
580 *
581 * Currently we don't know the generation for parent directory, so
582 * a generation of 0 means "accept any"
583 */
584 inode = iget(sb, ino);
585 if (inode == NULL)
586 return ERR_PTR(-ENOMEM);
587 if (is_bad_inode(inode) ||
588 (generation && inode->i_generation != generation)) {
589 iput(inode);
590 return ERR_PTR(-ESTALE);
591 }
592 /* now to find a dentry.
593 * If possible, get a well-connected one
594 */
595 result = d_alloc_anon(inode);
596 if (!result) {
597 iput(inode);
598 return ERR_PTR(-ENOMEM);
599 }
600 return result;
601}
602
Mark Bellon8fc27512005-09-06 15:16:54 -0700603#ifdef CONFIG_QUOTA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
605#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
606
607static int ext3_dquot_initialize(struct inode *inode, int type);
608static int ext3_dquot_drop(struct inode *inode);
609static int ext3_write_dquot(struct dquot *dquot);
610static int ext3_acquire_dquot(struct dquot *dquot);
611static int ext3_release_dquot(struct dquot *dquot);
612static int ext3_mark_dquot_dirty(struct dquot *dquot);
613static int ext3_write_info(struct super_block *sb, int type);
614static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
615static int ext3_quota_on_mount(struct super_block *sb, int type);
616static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
617 size_t len, loff_t off);
618static ssize_t ext3_quota_write(struct super_block *sb, int type,
619 const char *data, size_t len, loff_t off);
620
621static struct dquot_operations ext3_quota_operations = {
622 .initialize = ext3_dquot_initialize,
623 .drop = ext3_dquot_drop,
624 .alloc_space = dquot_alloc_space,
625 .alloc_inode = dquot_alloc_inode,
626 .free_space = dquot_free_space,
627 .free_inode = dquot_free_inode,
628 .transfer = dquot_transfer,
629 .write_dquot = ext3_write_dquot,
630 .acquire_dquot = ext3_acquire_dquot,
631 .release_dquot = ext3_release_dquot,
632 .mark_dirty = ext3_mark_dquot_dirty,
633 .write_info = ext3_write_info
634};
635
636static struct quotactl_ops ext3_qctl_operations = {
637 .quota_on = ext3_quota_on,
638 .quota_off = vfs_quota_off,
639 .quota_sync = vfs_quota_sync,
640 .get_info = vfs_get_dqinfo,
641 .set_info = vfs_set_dqinfo,
642 .get_dqblk = vfs_get_dqblk,
643 .set_dqblk = vfs_set_dqblk
644};
645#endif
646
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800647static const struct super_operations ext3_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 .alloc_inode = ext3_alloc_inode,
649 .destroy_inode = ext3_destroy_inode,
650 .read_inode = ext3_read_inode,
651 .write_inode = ext3_write_inode,
652 .dirty_inode = ext3_dirty_inode,
653 .delete_inode = ext3_delete_inode,
654 .put_super = ext3_put_super,
655 .write_super = ext3_write_super,
656 .sync_fs = ext3_sync_fs,
657 .write_super_lockfs = ext3_write_super_lockfs,
658 .unlockfs = ext3_unlockfs,
659 .statfs = ext3_statfs,
660 .remount_fs = ext3_remount,
661 .clear_inode = ext3_clear_inode,
Mark Bellon8fc27512005-09-06 15:16:54 -0700662 .show_options = ext3_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663#ifdef CONFIG_QUOTA
664 .quota_read = ext3_quota_read,
665 .quota_write = ext3_quota_write,
666#endif
667};
668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669static struct export_operations ext3_export_ops = {
670 .get_parent = ext3_get_parent,
NeilBrownfdb36672006-09-16 12:15:38 -0700671 .get_dentry = ext3_get_dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672};
673
674enum {
675 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
676 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Adrian Bunk2860b732005-11-08 21:34:59 -0800677 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Badari Pulavartyade1a292006-06-26 00:25:04 -0700679 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
Johann Lombardi71b96252006-01-08 01:03:20 -0800680 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
682 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara1f545872005-06-23 22:01:04 -0700683 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Mark Bellon8fc27512005-09-06 15:16:54 -0700684 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
685 Opt_grpquota
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686};
687
688static match_table_t tokens = {
689 {Opt_bsd_df, "bsddf"},
690 {Opt_minix_df, "minixdf"},
691 {Opt_grpid, "grpid"},
692 {Opt_grpid, "bsdgroups"},
693 {Opt_nogrpid, "nogrpid"},
694 {Opt_nogrpid, "sysvgroups"},
695 {Opt_resgid, "resgid=%u"},
696 {Opt_resuid, "resuid=%u"},
697 {Opt_sb, "sb=%u"},
698 {Opt_err_cont, "errors=continue"},
699 {Opt_err_panic, "errors=panic"},
700 {Opt_err_ro, "errors=remount-ro"},
701 {Opt_nouid32, "nouid32"},
702 {Opt_nocheck, "nocheck"},
703 {Opt_nocheck, "check=none"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 {Opt_debug, "debug"},
705 {Opt_oldalloc, "oldalloc"},
706 {Opt_orlov, "orlov"},
707 {Opt_user_xattr, "user_xattr"},
708 {Opt_nouser_xattr, "nouser_xattr"},
709 {Opt_acl, "acl"},
710 {Opt_noacl, "noacl"},
711 {Opt_reservation, "reservation"},
712 {Opt_noreservation, "noreservation"},
713 {Opt_noload, "noload"},
714 {Opt_nobh, "nobh"},
Badari Pulavartyade1a292006-06-26 00:25:04 -0700715 {Opt_bh, "bh"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 {Opt_commit, "commit=%u"},
717 {Opt_journal_update, "journal=update"},
718 {Opt_journal_inum, "journal=%u"},
Johann Lombardi71b96252006-01-08 01:03:20 -0800719 {Opt_journal_dev, "journal_dev=%u"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 {Opt_abort, "abort"},
721 {Opt_data_journal, "data=journal"},
722 {Opt_data_ordered, "data=ordered"},
723 {Opt_data_writeback, "data=writeback"},
724 {Opt_offusrjquota, "usrjquota="},
725 {Opt_usrjquota, "usrjquota=%s"},
726 {Opt_offgrpjquota, "grpjquota="},
727 {Opt_grpjquota, "grpjquota=%s"},
728 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
729 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700730 {Opt_grpquota, "grpquota"},
Jan Kara1f545872005-06-23 22:01:04 -0700731 {Opt_noquota, "noquota"},
732 {Opt_quota, "quota"},
Mark Bellon8fc27512005-09-06 15:16:54 -0700733 {Opt_usrquota, "usrquota"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 {Opt_barrier, "barrier=%u"},
735 {Opt_err, NULL},
736 {Opt_resize, "resize"},
737};
738
Mingming Cao43d23f92006-06-25 05:48:07 -0700739static ext3_fsblk_t get_sb_block(void **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740{
Dave Kleikampe9ad5622006-09-27 01:49:35 -0700741 ext3_fsblk_t sb_block;
742 char *options = (char *) *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
744 if (!options || strncmp(options, "sb=", 3) != 0)
745 return 1; /* Default location */
746 options += 3;
Mingming Cao43d23f92006-06-25 05:48:07 -0700747 /*todo: use simple_strtoll with >32bit ext3 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 sb_block = simple_strtoul(options, &options, 0);
749 if (*options && *options != ',') {
750 printk("EXT3-fs: Invalid sb specification: %s\n",
751 (char *) *data);
752 return 1;
753 }
754 if (*options == ',')
755 options++;
756 *data = (void *) options;
757 return sb_block;
758}
759
Johann Lombardi71b96252006-01-08 01:03:20 -0800760static int parse_options (char *options, struct super_block *sb,
Eric Sandeeneee194e2006-09-27 01:49:30 -0700761 unsigned int *inum, unsigned long *journal_devnum,
Mingming Cao43d23f92006-06-25 05:48:07 -0700762 ext3_fsblk_t *n_blocks_count, int is_remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
764 struct ext3_sb_info *sbi = EXT3_SB(sb);
765 char * p;
766 substring_t args[MAX_OPT_ARGS];
767 int data_opt = 0;
768 int option;
769#ifdef CONFIG_QUOTA
770 int qtype;
771 char *qname;
772#endif
773
774 if (!options)
775 return 1;
776
777 while ((p = strsep (&options, ",")) != NULL) {
778 int token;
779 if (!*p)
780 continue;
781
782 token = match_token(p, tokens, args);
783 switch (token) {
784 case Opt_bsd_df:
785 clear_opt (sbi->s_mount_opt, MINIX_DF);
786 break;
787 case Opt_minix_df:
788 set_opt (sbi->s_mount_opt, MINIX_DF);
789 break;
790 case Opt_grpid:
791 set_opt (sbi->s_mount_opt, GRPID);
792 break;
793 case Opt_nogrpid:
794 clear_opt (sbi->s_mount_opt, GRPID);
795 break;
796 case Opt_resuid:
797 if (match_int(&args[0], &option))
798 return 0;
799 sbi->s_resuid = option;
800 break;
801 case Opt_resgid:
802 if (match_int(&args[0], &option))
803 return 0;
804 sbi->s_resgid = option;
805 break;
806 case Opt_sb:
807 /* handled by get_sb_block() instead of here */
808 /* *sb_block = match_int(&args[0]); */
809 break;
810 case Opt_err_panic:
811 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
812 clear_opt (sbi->s_mount_opt, ERRORS_RO);
813 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
814 break;
815 case Opt_err_ro:
816 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
817 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
818 set_opt (sbi->s_mount_opt, ERRORS_RO);
819 break;
820 case Opt_err_cont:
821 clear_opt (sbi->s_mount_opt, ERRORS_RO);
822 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
823 set_opt (sbi->s_mount_opt, ERRORS_CONT);
824 break;
825 case Opt_nouid32:
826 set_opt (sbi->s_mount_opt, NO_UID32);
827 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 case Opt_nocheck:
829 clear_opt (sbi->s_mount_opt, CHECK);
830 break;
831 case Opt_debug:
832 set_opt (sbi->s_mount_opt, DEBUG);
833 break;
834 case Opt_oldalloc:
835 set_opt (sbi->s_mount_opt, OLDALLOC);
836 break;
837 case Opt_orlov:
838 clear_opt (sbi->s_mount_opt, OLDALLOC);
839 break;
840#ifdef CONFIG_EXT3_FS_XATTR
841 case Opt_user_xattr:
842 set_opt (sbi->s_mount_opt, XATTR_USER);
843 break;
844 case Opt_nouser_xattr:
845 clear_opt (sbi->s_mount_opt, XATTR_USER);
846 break;
847#else
848 case Opt_user_xattr:
849 case Opt_nouser_xattr:
850 printk("EXT3 (no)user_xattr options not supported\n");
851 break;
852#endif
853#ifdef CONFIG_EXT3_FS_POSIX_ACL
854 case Opt_acl:
855 set_opt(sbi->s_mount_opt, POSIX_ACL);
856 break;
857 case Opt_noacl:
858 clear_opt(sbi->s_mount_opt, POSIX_ACL);
859 break;
860#else
861 case Opt_acl:
862 case Opt_noacl:
863 printk("EXT3 (no)acl options not supported\n");
864 break;
865#endif
866 case Opt_reservation:
867 set_opt(sbi->s_mount_opt, RESERVATION);
868 break;
869 case Opt_noreservation:
870 clear_opt(sbi->s_mount_opt, RESERVATION);
871 break;
872 case Opt_journal_update:
873 /* @@@ FIXME */
874 /* Eventually we will want to be able to create
875 a journal file here. For now, only allow the
876 user to specify an existing inode to be the
877 journal file. */
878 if (is_remount) {
879 printk(KERN_ERR "EXT3-fs: cannot specify "
880 "journal on remount\n");
881 return 0;
882 }
883 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
884 break;
885 case Opt_journal_inum:
886 if (is_remount) {
887 printk(KERN_ERR "EXT3-fs: cannot specify "
888 "journal on remount\n");
889 return 0;
890 }
891 if (match_int(&args[0], &option))
892 return 0;
893 *inum = option;
894 break;
Johann Lombardi71b96252006-01-08 01:03:20 -0800895 case Opt_journal_dev:
896 if (is_remount) {
897 printk(KERN_ERR "EXT3-fs: cannot specify "
898 "journal on remount\n");
899 return 0;
900 }
901 if (match_int(&args[0], &option))
902 return 0;
903 *journal_devnum = option;
904 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 case Opt_noload:
906 set_opt (sbi->s_mount_opt, NOLOAD);
907 break;
908 case Opt_commit:
909 if (match_int(&args[0], &option))
910 return 0;
911 if (option < 0)
912 return 0;
913 if (option == 0)
914 option = JBD_DEFAULT_MAX_COMMIT_AGE;
915 sbi->s_commit_interval = HZ * option;
916 break;
917 case Opt_data_journal:
918 data_opt = EXT3_MOUNT_JOURNAL_DATA;
919 goto datacheck;
920 case Opt_data_ordered:
921 data_opt = EXT3_MOUNT_ORDERED_DATA;
922 goto datacheck;
923 case Opt_data_writeback:
924 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
925 datacheck:
926 if (is_remount) {
927 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
928 != data_opt) {
929 printk(KERN_ERR
930 "EXT3-fs: cannot change data "
931 "mode on remount\n");
932 return 0;
933 }
934 } else {
935 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
936 sbi->s_mount_opt |= data_opt;
937 }
938 break;
939#ifdef CONFIG_QUOTA
940 case Opt_usrjquota:
941 qtype = USRQUOTA;
942 goto set_qf_name;
943 case Opt_grpjquota:
944 qtype = GRPQUOTA;
945set_qf_name:
946 if (sb_any_quota_enabled(sb)) {
947 printk(KERN_ERR
948 "EXT3-fs: Cannot change journalled "
949 "quota options when quota turned on.\n");
950 return 0;
951 }
952 qname = match_strdup(&args[0]);
953 if (!qname) {
954 printk(KERN_ERR
955 "EXT3-fs: not enough memory for "
956 "storing quotafile name.\n");
957 return 0;
958 }
959 if (sbi->s_qf_names[qtype] &&
960 strcmp(sbi->s_qf_names[qtype], qname)) {
961 printk(KERN_ERR
962 "EXT3-fs: %s quota file already "
963 "specified.\n", QTYPE2NAME(qtype));
964 kfree(qname);
965 return 0;
966 }
967 sbi->s_qf_names[qtype] = qname;
968 if (strchr(sbi->s_qf_names[qtype], '/')) {
969 printk(KERN_ERR
970 "EXT3-fs: quotafile must be on "
971 "filesystem root.\n");
972 kfree(sbi->s_qf_names[qtype]);
973 sbi->s_qf_names[qtype] = NULL;
974 return 0;
975 }
Jan Kara1f545872005-06-23 22:01:04 -0700976 set_opt(sbi->s_mount_opt, QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 break;
978 case Opt_offusrjquota:
979 qtype = USRQUOTA;
980 goto clear_qf_name;
981 case Opt_offgrpjquota:
982 qtype = GRPQUOTA;
983clear_qf_name:
984 if (sb_any_quota_enabled(sb)) {
985 printk(KERN_ERR "EXT3-fs: Cannot change "
986 "journalled quota options when "
987 "quota turned on.\n");
988 return 0;
989 }
Jan Kara08c6a962005-07-12 13:58:28 -0700990 /*
991 * The space will be released later when all options
992 * are confirmed to be correct
993 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 sbi->s_qf_names[qtype] = NULL;
995 break;
996 case Opt_jqfmt_vfsold:
997 sbi->s_jquota_fmt = QFMT_VFS_OLD;
998 break;
999 case Opt_jqfmt_vfsv0:
1000 sbi->s_jquota_fmt = QFMT_VFS_V0;
1001 break;
Jan Kara1f545872005-06-23 22:01:04 -07001002 case Opt_quota:
Mark Bellon8fc27512005-09-06 15:16:54 -07001003 case Opt_usrquota:
Jan Kara1f545872005-06-23 22:01:04 -07001004 set_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -07001005 set_opt(sbi->s_mount_opt, USRQUOTA);
1006 break;
1007 case Opt_grpquota:
1008 set_opt(sbi->s_mount_opt, QUOTA);
1009 set_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -07001010 break;
1011 case Opt_noquota:
1012 if (sb_any_quota_enabled(sb)) {
1013 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1014 "options when quota turned on.\n");
1015 return 0;
1016 }
1017 clear_opt(sbi->s_mount_opt, QUOTA);
Mark Bellon8fc27512005-09-06 15:16:54 -07001018 clear_opt(sbi->s_mount_opt, USRQUOTA);
1019 clear_opt(sbi->s_mount_opt, GRPQUOTA);
Jan Kara1f545872005-06-23 22:01:04 -07001020 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021#else
Mark Bellon8fc27512005-09-06 15:16:54 -07001022 case Opt_quota:
1023 case Opt_usrquota:
1024 case Opt_grpquota:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 case Opt_usrjquota:
1026 case Opt_grpjquota:
1027 case Opt_offusrjquota:
1028 case Opt_offgrpjquota:
1029 case Opt_jqfmt_vfsold:
1030 case Opt_jqfmt_vfsv0:
1031 printk(KERN_ERR
1032 "EXT3-fs: journalled quota options not "
1033 "supported.\n");
1034 break;
Jan Kara1f545872005-06-23 22:01:04 -07001035 case Opt_noquota:
1036 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037#endif
1038 case Opt_abort:
1039 set_opt(sbi->s_mount_opt, ABORT);
1040 break;
1041 case Opt_barrier:
1042 if (match_int(&args[0], &option))
1043 return 0;
1044 if (option)
1045 set_opt(sbi->s_mount_opt, BARRIER);
1046 else
1047 clear_opt(sbi->s_mount_opt, BARRIER);
1048 break;
1049 case Opt_ignore:
1050 break;
1051 case Opt_resize:
Jan Kara08c6a962005-07-12 13:58:28 -07001052 if (!is_remount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 printk("EXT3-fs: resize option only available "
1054 "for remount\n");
1055 return 0;
1056 }
KAMBAROV, ZAURc7f17212005-06-28 20:45:11 -07001057 if (match_int(&args[0], &option) != 0)
1058 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 *n_blocks_count = option;
1060 break;
1061 case Opt_nobh:
1062 set_opt(sbi->s_mount_opt, NOBH);
1063 break;
Badari Pulavartyade1a292006-06-26 00:25:04 -07001064 case Opt_bh:
1065 clear_opt(sbi->s_mount_opt, NOBH);
1066 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 default:
1068 printk (KERN_ERR
1069 "EXT3-fs: Unrecognized mount option \"%s\" "
1070 "or missing value\n", p);
1071 return 0;
1072 }
1073 }
1074#ifdef CONFIG_QUOTA
Mark Bellon8fc27512005-09-06 15:16:54 -07001075 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1076 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1077 sbi->s_qf_names[USRQUOTA])
1078 clear_opt(sbi->s_mount_opt, USRQUOTA);
1079
1080 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1081 sbi->s_qf_names[GRPQUOTA])
1082 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1083
1084 if ((sbi->s_qf_names[USRQUOTA] &&
1085 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1086 (sbi->s_qf_names[GRPQUOTA] &&
1087 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1088 printk(KERN_ERR "EXT3-fs: old and new quota "
1089 "format mixing.\n");
1090 return 0;
1091 }
1092
1093 if (!sbi->s_jquota_fmt) {
1094 printk(KERN_ERR "EXT3-fs: journalled quota format "
1095 "not specified.\n");
1096 return 0;
1097 }
1098 } else {
1099 if (sbi->s_jquota_fmt) {
1100 printk(KERN_ERR "EXT3-fs: journalled quota format "
1101 "specified with no journalling "
1102 "enabled.\n");
1103 return 0;
1104 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 }
1106#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 return 1;
1108}
1109
1110static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1111 int read_only)
1112{
1113 struct ext3_sb_info *sbi = EXT3_SB(sb);
1114 int res = 0;
1115
1116 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1117 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1118 "forcing read-only mode\n");
1119 res = MS_RDONLY;
1120 }
1121 if (read_only)
1122 return res;
1123 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1124 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1125 "running e2fsck is recommended\n");
1126 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1127 printk (KERN_WARNING
1128 "EXT3-fs warning: mounting fs with errors, "
1129 "running e2fsck is recommended\n");
1130 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1131 le16_to_cpu(es->s_mnt_count) >=
1132 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1133 printk (KERN_WARNING
1134 "EXT3-fs warning: maximal mount count reached, "
1135 "running e2fsck is recommended\n");
1136 else if (le32_to_cpu(es->s_checkinterval) &&
1137 (le32_to_cpu(es->s_lastcheck) +
1138 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1139 printk (KERN_WARNING
1140 "EXT3-fs warning: checktime reached, "
1141 "running e2fsck is recommended\n");
1142#if 0
1143 /* @@@ We _will_ want to clear the valid bit if we find
1144 inconsistencies, to force a fsck at reboot. But for
1145 a plain journaled filesystem we can keep it set as
1146 valid forever! :) */
1147 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1148#endif
1149 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1150 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1151 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1152 es->s_mtime = cpu_to_le32(get_seconds());
1153 ext3_update_dynamic_rev(sb);
1154 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1155
1156 ext3_commit_super(sb, es, 1);
1157 if (test_opt(sb, DEBUG))
1158 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1159 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1160 sb->s_blocksize,
1161 sbi->s_groups_count,
1162 EXT3_BLOCKS_PER_GROUP(sb),
1163 EXT3_INODES_PER_GROUP(sb),
1164 sbi->s_mount_opt);
1165
1166 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1167 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1168 char b[BDEVNAME_SIZE];
1169
1170 printk("external journal on %s\n",
1171 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1172 } else {
1173 printk("internal journal\n");
1174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 return res;
1176}
1177
1178/* Called at mount-time, super-block is locked */
1179static int ext3_check_descriptors (struct super_block * sb)
1180{
1181 struct ext3_sb_info *sbi = EXT3_SB(sb);
Eric Sandeen855565e2006-09-27 01:49:29 -07001182 ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1183 ext3_fsblk_t last_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 struct ext3_group_desc * gdp = NULL;
1185 int desc_block = 0;
1186 int i;
1187
1188 ext3_debug ("Checking group descriptors");
1189
1190 for (i = 0; i < sbi->s_groups_count; i++)
1191 {
Eric Sandeen855565e2006-09-27 01:49:29 -07001192 if (i == sbi->s_groups_count - 1)
1193 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1194 else
1195 last_block = first_block +
1196 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1197
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1199 gdp = (struct ext3_group_desc *)
1200 sbi->s_group_desc[desc_block++]->b_data;
Eric Sandeen855565e2006-09-27 01:49:29 -07001201 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1202 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 {
1204 ext3_error (sb, "ext3_check_descriptors",
1205 "Block bitmap for group %d"
1206 " not in group (block %lu)!",
1207 i, (unsigned long)
1208 le32_to_cpu(gdp->bg_block_bitmap));
1209 return 0;
1210 }
Eric Sandeen855565e2006-09-27 01:49:29 -07001211 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1212 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 {
1214 ext3_error (sb, "ext3_check_descriptors",
1215 "Inode bitmap for group %d"
1216 " not in group (block %lu)!",
1217 i, (unsigned long)
1218 le32_to_cpu(gdp->bg_inode_bitmap));
1219 return 0;
1220 }
Eric Sandeen855565e2006-09-27 01:49:29 -07001221 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1222 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
1223 last_block)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 {
1225 ext3_error (sb, "ext3_check_descriptors",
1226 "Inode table for group %d"
1227 " not in group (block %lu)!",
1228 i, (unsigned long)
1229 le32_to_cpu(gdp->bg_inode_table));
1230 return 0;
1231 }
Eric Sandeen855565e2006-09-27 01:49:29 -07001232 first_block += EXT3_BLOCKS_PER_GROUP(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 gdp++;
1234 }
1235
1236 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1237 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1238 return 1;
1239}
1240
1241
1242/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1243 * the superblock) which were deleted from all directories, but held open by
1244 * a process at the time of a crash. We walk the list and try to delete these
1245 * inodes at recovery time (only with a read-write filesystem).
1246 *
1247 * In order to keep the orphan inode chain consistent during traversal (in
1248 * case of crash during recovery), we link each inode into the superblock
1249 * orphan list_head and handle it the same way as an inode deletion during
1250 * normal operation (which journals the operations for us).
1251 *
1252 * We only do an iget() and an iput() on each inode, which is very safe if we
1253 * accidentally point at an in-use or already deleted inode. The worst that
1254 * can happen in this case is that we get a "bit already cleared" message from
1255 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1256 * e2fsck was run on this filesystem, and it must have already done the orphan
1257 * inode cleanup for us, so we can safely abort without any further action.
1258 */
1259static void ext3_orphan_cleanup (struct super_block * sb,
1260 struct ext3_super_block * es)
1261{
1262 unsigned int s_flags = sb->s_flags;
1263 int nr_orphans = 0, nr_truncates = 0;
1264#ifdef CONFIG_QUOTA
1265 int i;
1266#endif
1267 if (!es->s_last_orphan) {
1268 jbd_debug(4, "no orphan inodes to clean up\n");
1269 return;
1270 }
1271
Eric Sandeena8f48a92006-12-06 20:40:13 -08001272 if (bdev_read_only(sb->s_bdev)) {
1273 printk(KERN_ERR "EXT3-fs: write access "
1274 "unavailable, skipping orphan cleanup.\n");
1275 return;
1276 }
1277
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1279 if (es->s_last_orphan)
1280 jbd_debug(1, "Errors on filesystem, "
1281 "clearing orphan list.\n");
1282 es->s_last_orphan = 0;
1283 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1284 return;
1285 }
1286
1287 if (s_flags & MS_RDONLY) {
1288 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1289 sb->s_id);
1290 sb->s_flags &= ~MS_RDONLY;
1291 }
1292#ifdef CONFIG_QUOTA
1293 /* Needed for iput() to work correctly and not trash data */
1294 sb->s_flags |= MS_ACTIVE;
1295 /* Turn on quotas so that they are updated correctly */
1296 for (i = 0; i < MAXQUOTAS; i++) {
1297 if (EXT3_SB(sb)->s_qf_names[i]) {
1298 int ret = ext3_quota_on_mount(sb, i);
1299 if (ret < 0)
1300 printk(KERN_ERR
1301 "EXT3-fs: Cannot turn on journalled "
1302 "quota: error %d\n", ret);
1303 }
1304 }
1305#endif
1306
1307 while (es->s_last_orphan) {
1308 struct inode *inode;
1309
1310 if (!(inode =
1311 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1312 es->s_last_orphan = 0;
1313 break;
1314 }
1315
1316 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1317 DQUOT_INIT(inode);
1318 if (inode->i_nlink) {
1319 printk(KERN_DEBUG
Eric Sandeeneee194e2006-09-27 01:49:30 -07001320 "%s: truncating inode %lu to %Ld bytes\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 __FUNCTION__, inode->i_ino, inode->i_size);
Eric Sandeeneee194e2006-09-27 01:49:30 -07001322 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 inode->i_ino, inode->i_size);
1324 ext3_truncate(inode);
1325 nr_truncates++;
1326 } else {
1327 printk(KERN_DEBUG
Eric Sandeeneee194e2006-09-27 01:49:30 -07001328 "%s: deleting unreferenced inode %lu\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 __FUNCTION__, inode->i_ino);
Eric Sandeeneee194e2006-09-27 01:49:30 -07001330 jbd_debug(2, "deleting unreferenced inode %lu\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 inode->i_ino);
1332 nr_orphans++;
1333 }
1334 iput(inode); /* The delete magic happens here! */
1335 }
1336
1337#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1338
1339 if (nr_orphans)
1340 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1341 sb->s_id, PLURAL(nr_orphans));
1342 if (nr_truncates)
1343 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1344 sb->s_id, PLURAL(nr_truncates));
1345#ifdef CONFIG_QUOTA
1346 /* Turn quotas off */
1347 for (i = 0; i < MAXQUOTAS; i++) {
1348 if (sb_dqopt(sb)->files[i])
1349 vfs_quota_off(sb, i);
1350 }
1351#endif
1352 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1353}
1354
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355/*
1356 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1357 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1358 * We need to be 1 filesystem block less than the 2^32 sector limit.
1359 */
1360static loff_t ext3_max_size(int bits)
1361{
1362 loff_t res = EXT3_NDIR_BLOCKS;
1363 /* This constant is calculated to be the largest file size for a
1364 * dense, 4k-blocksize file such that the total number of
1365 * sectors in the file, including data and all indirect blocks,
1366 * does not exceed 2^32. */
1367 const loff_t upper_limit = 0x1ff7fffd000LL;
1368
1369 res += 1LL << (bits-2);
1370 res += 1LL << (2*(bits-2));
1371 res += 1LL << (3*(bits-2));
1372 res <<= bits;
1373 if (res > upper_limit)
1374 res = upper_limit;
1375 return res;
1376}
1377
Mingming Cao43d23f92006-06-25 05:48:07 -07001378static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1379 ext3_fsblk_t logic_sb_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 int nr)
1381{
1382 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07001383 unsigned long bg, first_meta_bg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 int has_super = 0;
1385
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1387
1388 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1389 nr < first_meta_bg)
1390 return (logic_sb_block + nr + 1);
1391 bg = sbi->s_desc_per_block * nr;
1392 if (ext3_bg_has_super(sb, bg))
1393 has_super = 1;
Mingming Cao43d23f92006-06-25 05:48:07 -07001394 return (has_super + ext3_group_first_block_no(sb, bg));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395}
1396
1397
1398static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1399{
1400 struct buffer_head * bh;
1401 struct ext3_super_block *es = NULL;
1402 struct ext3_sb_info *sbi;
Mingming Cao43d23f92006-06-25 05:48:07 -07001403 ext3_fsblk_t block;
1404 ext3_fsblk_t sb_block = get_sb_block(&data);
1405 ext3_fsblk_t logic_sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 unsigned long offset = 0;
Eric Sandeeneee194e2006-09-27 01:49:30 -07001407 unsigned int journal_inum = 0;
Johann Lombardi71b96252006-01-08 01:03:20 -08001408 unsigned long journal_devnum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 unsigned long def_mount_opts;
1410 struct inode *root;
1411 int blocksize;
1412 int hblock;
1413 int db_count;
1414 int i;
1415 int needs_recovery;
1416 __le32 features;
1417
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -07001418 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 if (!sbi)
1420 return -ENOMEM;
1421 sb->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 sbi->s_mount_opt = 0;
1423 sbi->s_resuid = EXT3_DEF_RESUID;
1424 sbi->s_resgid = EXT3_DEF_RESGID;
1425
1426 unlock_kernel();
1427
1428 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1429 if (!blocksize) {
1430 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1431 goto out_fail;
1432 }
1433
1434 /*
1435 * The ext3 superblock will not be buffer aligned for other than 1kB
1436 * block sizes. We need to calculate the offset from buffer start.
1437 */
1438 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1439 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1440 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1441 } else {
1442 logic_sb_block = sb_block;
1443 }
1444
1445 if (!(bh = sb_bread(sb, logic_sb_block))) {
1446 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1447 goto out_fail;
1448 }
1449 /*
1450 * Note: s_es must be initialized as soon as possible because
1451 * some ext3 macro-instructions depend on its value
1452 */
1453 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1454 sbi->s_es = es;
1455 sb->s_magic = le16_to_cpu(es->s_magic);
1456 if (sb->s_magic != EXT3_SUPER_MAGIC)
1457 goto cantfind_ext3;
1458
1459 /* Set defaults before we parse the mount options */
1460 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1461 if (def_mount_opts & EXT3_DEFM_DEBUG)
1462 set_opt(sbi->s_mount_opt, DEBUG);
1463 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1464 set_opt(sbi->s_mount_opt, GRPID);
1465 if (def_mount_opts & EXT3_DEFM_UID16)
1466 set_opt(sbi->s_mount_opt, NO_UID32);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001467#ifdef CONFIG_EXT3_FS_XATTR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1469 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001470#endif
1471#ifdef CONFIG_EXT3_FS_POSIX_ACL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 if (def_mount_opts & EXT3_DEFM_ACL)
1473 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001474#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1476 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1477 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1478 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1479 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1480 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1481
1482 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1483 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1484 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1485 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dmitry Mishin2245d7c2006-10-11 01:21:49 -07001486 else
1487 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488
1489 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1490 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1491
1492 set_opt(sbi->s_mount_opt, RESERVATION);
1493
Johann Lombardi71b96252006-01-08 01:03:20 -08001494 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1495 NULL, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 goto failed_mount;
1497
1498 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1499 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1500
1501 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1502 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1503 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1504 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001505 printk(KERN_WARNING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 "EXT3-fs warning: feature flags set on rev 0 fs, "
1507 "running e2fsck is recommended\n");
1508 /*
1509 * Check feature flags regardless of the revision level, since we
1510 * previously didn't change the revision level when setting the flags,
1511 * so there is a chance incompat flags are set on a rev 0 filesystem.
1512 */
1513 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1514 if (features) {
1515 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1516 "unsupported optional features (%x).\n",
1517 sb->s_id, le32_to_cpu(features));
1518 goto failed_mount;
1519 }
1520 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1521 if (!(sb->s_flags & MS_RDONLY) && features) {
1522 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1523 "unsupported optional features (%x).\n",
1524 sb->s_id, le32_to_cpu(features));
1525 goto failed_mount;
1526 }
1527 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1528
1529 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1530 blocksize > EXT3_MAX_BLOCK_SIZE) {
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001531 printk(KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1533 blocksize, sb->s_id);
1534 goto failed_mount;
1535 }
1536
1537 hblock = bdev_hardsect_size(sb->s_bdev);
1538 if (sb->s_blocksize != blocksize) {
1539 /*
1540 * Make sure the blocksize for the filesystem is larger
1541 * than the hardware sectorsize for the machine.
1542 */
1543 if (blocksize < hblock) {
1544 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1545 "device blocksize %d.\n", blocksize, hblock);
1546 goto failed_mount;
1547 }
1548
1549 brelse (bh);
1550 sb_set_blocksize(sb, blocksize);
1551 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1552 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1553 bh = sb_bread(sb, logic_sb_block);
1554 if (!bh) {
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001555 printk(KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 "EXT3-fs: Can't read superblock on 2nd try.\n");
1557 goto failed_mount;
1558 }
1559 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1560 sbi->s_es = es;
1561 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001562 printk (KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 "EXT3-fs: Magic mismatch, very weird !\n");
1564 goto failed_mount;
1565 }
1566 }
1567
1568 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1569
1570 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1571 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1572 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1573 } else {
1574 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1575 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1576 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1577 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1578 (sbi->s_inode_size > blocksize)) {
1579 printk (KERN_ERR
1580 "EXT3-fs: unsupported inode size: %d\n",
1581 sbi->s_inode_size);
1582 goto failed_mount;
1583 }
1584 }
1585 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1586 le32_to_cpu(es->s_log_frag_size);
1587 if (blocksize != sbi->s_frag_size) {
1588 printk(KERN_ERR
1589 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1590 sbi->s_frag_size, blocksize);
1591 goto failed_mount;
1592 }
1593 sbi->s_frags_per_block = 1;
1594 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1595 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1596 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1597 if (EXT3_INODE_SIZE(sb) == 0)
1598 goto cantfind_ext3;
1599 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1600 if (sbi->s_inodes_per_block == 0)
1601 goto cantfind_ext3;
1602 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1603 sbi->s_inodes_per_block;
1604 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1605 sbi->s_sbh = bh;
1606 sbi->s_mount_state = le16_to_cpu(es->s_state);
David Howellsf0d1b0b2006-12-08 02:37:49 -08001607 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1608 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609 for (i=0; i < 4; i++)
1610 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1611 sbi->s_def_hash_version = es->s_def_hash_version;
1612
1613 if (sbi->s_blocks_per_group > blocksize * 8) {
1614 printk (KERN_ERR
1615 "EXT3-fs: #blocks per group too big: %lu\n",
1616 sbi->s_blocks_per_group);
1617 goto failed_mount;
1618 }
1619 if (sbi->s_frags_per_group > blocksize * 8) {
1620 printk (KERN_ERR
1621 "EXT3-fs: #fragments per group too big: %lu\n",
1622 sbi->s_frags_per_group);
1623 goto failed_mount;
1624 }
1625 if (sbi->s_inodes_per_group > blocksize * 8) {
1626 printk (KERN_ERR
1627 "EXT3-fs: #inodes per group too big: %lu\n",
1628 sbi->s_inodes_per_group);
1629 goto failed_mount;
1630 }
1631
Mingming Caofcd5df32006-06-25 05:47:50 -07001632 if (le32_to_cpu(es->s_blocks_count) >
1633 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1634 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1635 " too large to mount safely\n", sb->s_id);
1636 if (sizeof(sector_t) < 8)
1637 printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1638 "enabled\n");
1639 goto failed_mount;
1640 }
1641
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1643 goto cantfind_ext3;
Eric Sandeen855565e2006-09-27 01:49:29 -07001644 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1645 le32_to_cpu(es->s_first_data_block) - 1)
1646 / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1648 EXT3_DESC_PER_BLOCK(sb);
1649 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1650 GFP_KERNEL);
1651 if (sbi->s_group_desc == NULL) {
1652 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1653 goto failed_mount;
1654 }
1655
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 bgl_lock_init(&sbi->s_blockgroup_lock);
1657
1658 for (i = 0; i < db_count; i++) {
1659 block = descriptor_loc(sb, logic_sb_block, i);
1660 sbi->s_group_desc[i] = sb_bread(sb, block);
1661 if (!sbi->s_group_desc[i]) {
1662 printk (KERN_ERR "EXT3-fs: "
1663 "can't read group descriptor %d\n", i);
1664 db_count = i;
1665 goto failed_mount2;
1666 }
1667 }
1668 if (!ext3_check_descriptors (sb)) {
Theodore Ts'od2e5b132006-06-25 05:47:52 -07001669 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 goto failed_mount2;
1671 }
1672 sbi->s_gdb_count = db_count;
1673 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1674 spin_lock_init(&sbi->s_next_gen_lock);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001675
1676 percpu_counter_init(&sbi->s_freeblocks_counter,
1677 ext3_count_free_blocks(sb));
1678 percpu_counter_init(&sbi->s_freeinodes_counter,
1679 ext3_count_free_inodes(sb));
1680 percpu_counter_init(&sbi->s_dirs_counter,
1681 ext3_count_dirs(sb));
1682
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 /* per fileystem reservation list head & lock */
1684 spin_lock_init(&sbi->s_rsv_window_lock);
1685 sbi->s_rsv_window_root = RB_ROOT;
1686 /* Add a single, static dummy reservation to the start of the
1687 * reservation window list --- it gives us a placeholder for
1688 * append-at-start-of-list which makes the allocation logic
1689 * _much_ simpler. */
1690 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1691 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1692 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1693 sbi->s_rsv_window_head.rsv_goal_size = 0;
1694 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1695
1696 /*
1697 * set up enough so that it can read an inode
1698 */
1699 sb->s_op = &ext3_sops;
1700 sb->s_export_op = &ext3_export_ops;
1701 sb->s_xattr = ext3_xattr_handlers;
1702#ifdef CONFIG_QUOTA
1703 sb->s_qcop = &ext3_qctl_operations;
1704 sb->dq_op = &ext3_quota_operations;
1705#endif
1706 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1707
1708 sb->s_root = NULL;
1709
1710 needs_recovery = (es->s_last_orphan != 0 ||
1711 EXT3_HAS_INCOMPAT_FEATURE(sb,
1712 EXT3_FEATURE_INCOMPAT_RECOVER));
1713
1714 /*
1715 * The first inode we look at is the journal inode. Don't try
1716 * root first: it may be modified in the journal!
1717 */
1718 if (!test_opt(sb, NOLOAD) &&
1719 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
Johann Lombardi71b96252006-01-08 01:03:20 -08001720 if (ext3_load_journal(sb, es, journal_devnum))
Mingming Cao0216bfc2006-06-23 02:05:41 -07001721 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 } else if (journal_inum) {
1723 if (ext3_create_journal(sb, es, journal_inum))
Mingming Cao0216bfc2006-06-23 02:05:41 -07001724 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 } else {
1726 if (!silent)
1727 printk (KERN_ERR
1728 "ext3: No journal on filesystem on %s\n",
1729 sb->s_id);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001730 goto failed_mount3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 }
1732
1733 /* We have now updated the journal if required, so we can
1734 * validate the data journaling mode. */
1735 switch (test_opt(sb, DATA_FLAGS)) {
1736 case 0:
1737 /* No mode set, assume a default based on the journal
1738 capabilities: ORDERED_DATA if the journal can
1739 cope, else JOURNAL_DATA */
1740 if (journal_check_available_features
1741 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1742 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1743 else
1744 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1745 break;
1746
1747 case EXT3_MOUNT_ORDERED_DATA:
1748 case EXT3_MOUNT_WRITEBACK_DATA:
1749 if (!journal_check_available_features
1750 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1751 printk(KERN_ERR "EXT3-fs: Journal does not support "
1752 "requested data journaling mode\n");
Mingming Cao0216bfc2006-06-23 02:05:41 -07001753 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 }
1755 default:
1756 break;
1757 }
1758
1759 if (test_opt(sb, NOBH)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1761 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1762 "its supported only with writeback mode\n");
1763 clear_opt(sbi->s_mount_opt, NOBH);
1764 }
1765 }
1766 /*
1767 * The journal_load will have done any necessary log recovery,
1768 * so we can safely mount the rest of the filesystem now.
1769 */
1770
1771 root = iget(sb, EXT3_ROOT_INO);
1772 sb->s_root = d_alloc_root(root);
1773 if (!sb->s_root) {
1774 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1775 iput(root);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001776 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 }
1778 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1779 dput(sb->s_root);
1780 sb->s_root = NULL;
1781 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
Mingming Cao0216bfc2006-06-23 02:05:41 -07001782 goto failed_mount4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 }
1784
1785 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1786 /*
1787 * akpm: core read_super() calls in here with the superblock locked.
1788 * That deadlocks, because orphan cleanup needs to lock the superblock
1789 * in numerous places. Here we just pop the lock - it's relatively
1790 * harmless, because we are now ready to accept write_super() requests,
1791 * and aviro says that's the only reason for hanging onto the
1792 * superblock lock.
1793 */
1794 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1795 ext3_orphan_cleanup(sb, es);
1796 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1797 if (needs_recovery)
1798 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1799 ext3_mark_recovery_complete(sb, es);
1800 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1801 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1802 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1803 "writeback");
1804
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 lock_kernel();
1806 return 0;
1807
1808cantfind_ext3:
1809 if (!silent)
1810 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1811 sb->s_id);
1812 goto failed_mount;
1813
Mingming Cao0216bfc2006-06-23 02:05:41 -07001814failed_mount4:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815 journal_destroy(sbi->s_journal);
Mingming Cao0216bfc2006-06-23 02:05:41 -07001816failed_mount3:
1817 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1818 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1819 percpu_counter_destroy(&sbi->s_dirs_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820failed_mount2:
1821 for (i = 0; i < db_count; i++)
1822 brelse(sbi->s_group_desc[i]);
1823 kfree(sbi->s_group_desc);
1824failed_mount:
1825#ifdef CONFIG_QUOTA
1826 for (i = 0; i < MAXQUOTAS; i++)
1827 kfree(sbi->s_qf_names[i]);
1828#endif
1829 ext3_blkdev_remove(sbi);
1830 brelse(bh);
1831out_fail:
1832 sb->s_fs_info = NULL;
1833 kfree(sbi);
1834 lock_kernel();
1835 return -EINVAL;
1836}
1837
1838/*
1839 * Setup any per-fs journal parameters now. We'll do this both on
1840 * initial mount, once the journal has been initialised but before we've
Mingming Caoae6ddcc2006-09-27 01:49:27 -07001841 * done any recovery; and again on any subsequent remount.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 */
1843static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1844{
1845 struct ext3_sb_info *sbi = EXT3_SB(sb);
1846
1847 if (sbi->s_commit_interval)
1848 journal->j_commit_interval = sbi->s_commit_interval;
1849 /* We could also set up an ext3-specific default for the commit
1850 * interval here, but for now we'll just fall back to the jbd
1851 * default. */
1852
1853 spin_lock(&journal->j_state_lock);
1854 if (test_opt(sb, BARRIER))
1855 journal->j_flags |= JFS_BARRIER;
1856 else
1857 journal->j_flags &= ~JFS_BARRIER;
1858 spin_unlock(&journal->j_state_lock);
1859}
1860
Eric Sandeeneee194e2006-09-27 01:49:30 -07001861static journal_t *ext3_get_journal(struct super_block *sb,
1862 unsigned int journal_inum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863{
1864 struct inode *journal_inode;
1865 journal_t *journal;
1866
1867 /* First, test for the existence of a valid inode on disk. Bad
1868 * things happen if we iget() an unused inode, as the subsequent
1869 * iput() will try to delete it. */
1870
1871 journal_inode = iget(sb, journal_inum);
1872 if (!journal_inode) {
1873 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1874 return NULL;
1875 }
1876 if (!journal_inode->i_nlink) {
1877 make_bad_inode(journal_inode);
1878 iput(journal_inode);
1879 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1880 return NULL;
1881 }
1882
1883 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1884 journal_inode, journal_inode->i_size);
1885 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1886 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1887 iput(journal_inode);
1888 return NULL;
1889 }
1890
1891 journal = journal_init_inode(journal_inode);
1892 if (!journal) {
1893 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1894 iput(journal_inode);
1895 return NULL;
1896 }
1897 journal->j_private = sb;
1898 ext3_init_journal_params(sb, journal);
1899 return journal;
1900}
1901
1902static journal_t *ext3_get_dev_journal(struct super_block *sb,
1903 dev_t j_dev)
1904{
1905 struct buffer_head * bh;
1906 journal_t *journal;
Mingming Cao43d23f92006-06-25 05:48:07 -07001907 ext3_fsblk_t start;
Mingming Cao1c2bf372006-06-25 05:48:06 -07001908 ext3_fsblk_t len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 int hblock, blocksize;
Mingming Cao43d23f92006-06-25 05:48:07 -07001910 ext3_fsblk_t sb_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 unsigned long offset;
1912 struct ext3_super_block * es;
1913 struct block_device *bdev;
1914
1915 bdev = ext3_blkdev_get(j_dev);
1916 if (bdev == NULL)
1917 return NULL;
1918
1919 if (bd_claim(bdev, sb)) {
1920 printk(KERN_ERR
1921 "EXT3: failed to claim external journal device.\n");
1922 blkdev_put(bdev);
1923 return NULL;
1924 }
1925
1926 blocksize = sb->s_blocksize;
1927 hblock = bdev_hardsect_size(bdev);
1928 if (blocksize < hblock) {
1929 printk(KERN_ERR
1930 "EXT3-fs: blocksize too small for journal device.\n");
1931 goto out_bdev;
1932 }
1933
1934 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1935 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1936 set_blocksize(bdev, blocksize);
1937 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1938 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1939 "external journal\n");
1940 goto out_bdev;
1941 }
1942
1943 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1944 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1945 !(le32_to_cpu(es->s_feature_incompat) &
1946 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1947 printk(KERN_ERR "EXT3-fs: external journal has "
1948 "bad superblock\n");
1949 brelse(bh);
1950 goto out_bdev;
1951 }
1952
1953 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1954 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1955 brelse(bh);
1956 goto out_bdev;
1957 }
1958
1959 len = le32_to_cpu(es->s_blocks_count);
1960 start = sb_block + 1;
1961 brelse(bh); /* we're done with the superblock */
1962
1963 journal = journal_init_dev(bdev, sb->s_bdev,
1964 start, len, blocksize);
1965 if (!journal) {
1966 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1967 goto out_bdev;
1968 }
1969 journal->j_private = sb;
1970 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1971 wait_on_buffer(journal->j_sb_buffer);
1972 if (!buffer_uptodate(journal->j_sb_buffer)) {
1973 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1974 goto out_journal;
1975 }
1976 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1977 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1978 "user (unsupported) - %d\n",
1979 be32_to_cpu(journal->j_superblock->s_nr_users));
1980 goto out_journal;
1981 }
1982 EXT3_SB(sb)->journal_bdev = bdev;
1983 ext3_init_journal_params(sb, journal);
1984 return journal;
1985out_journal:
1986 journal_destroy(journal);
1987out_bdev:
1988 ext3_blkdev_put(bdev);
1989 return NULL;
1990}
1991
Johann Lombardi71b96252006-01-08 01:03:20 -08001992static int ext3_load_journal(struct super_block *sb,
1993 struct ext3_super_block *es,
1994 unsigned long journal_devnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995{
1996 journal_t *journal;
Eric Sandeeneee194e2006-09-27 01:49:30 -07001997 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
Johann Lombardi71b96252006-01-08 01:03:20 -08001998 dev_t journal_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001999 int err = 0;
2000 int really_read_only;
2001
Johann Lombardi71b96252006-01-08 01:03:20 -08002002 if (journal_devnum &&
2003 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2004 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2005 "numbers have changed\n");
2006 journal_dev = new_decode_dev(journal_devnum);
2007 } else
2008 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2009
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 really_read_only = bdev_read_only(sb->s_bdev);
2011
2012 /*
2013 * Are we loading a blank journal or performing recovery after a
2014 * crash? For recovery, we need to check in advance whether we
2015 * can get read-write access to the device.
2016 */
2017
2018 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2019 if (sb->s_flags & MS_RDONLY) {
2020 printk(KERN_INFO "EXT3-fs: INFO: recovery "
2021 "required on readonly filesystem.\n");
2022 if (really_read_only) {
2023 printk(KERN_ERR "EXT3-fs: write access "
2024 "unavailable, cannot proceed.\n");
2025 return -EROFS;
2026 }
2027 printk (KERN_INFO "EXT3-fs: write access will "
2028 "be enabled during recovery.\n");
2029 }
2030 }
2031
2032 if (journal_inum && journal_dev) {
2033 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2034 "and inode journals!\n");
2035 return -EINVAL;
2036 }
2037
2038 if (journal_inum) {
2039 if (!(journal = ext3_get_journal(sb, journal_inum)))
2040 return -EINVAL;
2041 } else {
2042 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2043 return -EINVAL;
2044 }
2045
2046 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2047 err = journal_update_format(journal);
2048 if (err) {
2049 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2050 journal_destroy(journal);
2051 return err;
2052 }
2053 }
2054
2055 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2056 err = journal_wipe(journal, !really_read_only);
2057 if (!err)
2058 err = journal_load(journal);
2059
2060 if (err) {
2061 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2062 journal_destroy(journal);
2063 return err;
2064 }
2065
2066 EXT3_SB(sb)->s_journal = journal;
2067 ext3_clear_journal_err(sb, es);
Johann Lombardi71b96252006-01-08 01:03:20 -08002068
2069 if (journal_devnum &&
2070 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2071 es->s_journal_dev = cpu_to_le32(journal_devnum);
2072 sb->s_dirt = 1;
2073
2074 /* Make sure we flush the recovery flag to disk. */
2075 ext3_commit_super(sb, es, 1);
2076 }
2077
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 return 0;
2079}
2080
2081static int ext3_create_journal(struct super_block * sb,
2082 struct ext3_super_block * es,
Eric Sandeeneee194e2006-09-27 01:49:30 -07002083 unsigned int journal_inum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084{
2085 journal_t *journal;
2086
2087 if (sb->s_flags & MS_RDONLY) {
2088 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2089 "create journal.\n");
2090 return -EROFS;
2091 }
2092
2093 if (!(journal = ext3_get_journal(sb, journal_inum)))
2094 return -EINVAL;
2095
Eric Sandeeneee194e2006-09-27 01:49:30 -07002096 printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 journal_inum);
2098
2099 if (journal_create(journal)) {
2100 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2101 journal_destroy(journal);
2102 return -EIO;
2103 }
2104
2105 EXT3_SB(sb)->s_journal = journal;
2106
2107 ext3_update_dynamic_rev(sb);
2108 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2109 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2110
2111 es->s_journal_inum = cpu_to_le32(journal_inum);
2112 sb->s_dirt = 1;
2113
2114 /* Make sure we flush the recovery flag to disk. */
2115 ext3_commit_super(sb, es, 1);
2116
2117 return 0;
2118}
2119
2120static void ext3_commit_super (struct super_block * sb,
2121 struct ext3_super_block * es,
2122 int sync)
2123{
2124 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2125
2126 if (!sbh)
2127 return;
2128 es->s_wtime = cpu_to_le32(get_seconds());
2129 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2130 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2131 BUFFER_TRACE(sbh, "marking dirty");
2132 mark_buffer_dirty(sbh);
2133 if (sync)
2134 sync_dirty_buffer(sbh);
2135}
2136
2137
2138/*
2139 * Have we just finished recovery? If so, and if we are mounting (or
2140 * remounting) the filesystem readonly, then we will end up with a
2141 * consistent fs on disk. Record that fact.
2142 */
2143static void ext3_mark_recovery_complete(struct super_block * sb,
2144 struct ext3_super_block * es)
2145{
2146 journal_t *journal = EXT3_SB(sb)->s_journal;
2147
2148 journal_lock_updates(journal);
2149 journal_flush(journal);
Jan Kara030703e2007-07-15 23:41:08 -07002150 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002151 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2152 sb->s_flags & MS_RDONLY) {
2153 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2154 sb->s_dirt = 0;
2155 ext3_commit_super(sb, es, 1);
2156 }
Jan Kara030703e2007-07-15 23:41:08 -07002157 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158 journal_unlock_updates(journal);
2159}
2160
2161/*
2162 * If we are mounting (or read-write remounting) a filesystem whose journal
2163 * has recorded an error from a previous lifetime, move that error to the
2164 * main filesystem now.
2165 */
2166static void ext3_clear_journal_err(struct super_block * sb,
2167 struct ext3_super_block * es)
2168{
2169 journal_t *journal;
2170 int j_errno;
2171 const char *errstr;
2172
2173 journal = EXT3_SB(sb)->s_journal;
2174
2175 /*
2176 * Now check for any error status which may have been recorded in the
2177 * journal by a prior ext3_error() or ext3_abort()
2178 */
2179
2180 j_errno = journal_errno(journal);
2181 if (j_errno) {
2182 char nbuf[16];
2183
2184 errstr = ext3_decode_error(sb, j_errno, nbuf);
2185 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2186 "from previous mount: %s", errstr);
2187 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2188 "filesystem check.");
2189
2190 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2191 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2192 ext3_commit_super (sb, es, 1);
2193
2194 journal_clear_err(journal);
2195 }
2196}
2197
2198/*
2199 * Force the running and committing transactions to commit,
2200 * and wait on the commit.
2201 */
2202int ext3_force_commit(struct super_block *sb)
2203{
2204 journal_t *journal;
2205 int ret;
2206
2207 if (sb->s_flags & MS_RDONLY)
2208 return 0;
2209
2210 journal = EXT3_SB(sb)->s_journal;
2211 sb->s_dirt = 0;
2212 ret = ext3_journal_force_commit(journal);
2213 return ret;
2214}
2215
2216/*
2217 * Ext3 always journals updates to the superblock itself, so we don't
2218 * have to propagate any other updates to the superblock on disk at this
2219 * point. Just start an async writeback to get the buffers on their way
2220 * to the disk.
2221 *
2222 * This implicitly triggers the writebehind on sync().
2223 */
2224
2225static void ext3_write_super (struct super_block * sb)
2226{
Ingo Molnar7892f2f2006-01-09 15:59:25 -08002227 if (mutex_trylock(&sb->s_lock) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 BUG();
2229 sb->s_dirt = 0;
2230}
2231
2232static int ext3_sync_fs(struct super_block *sb, int wait)
2233{
2234 tid_t target;
2235
2236 sb->s_dirt = 0;
2237 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2238 if (wait)
2239 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2240 }
2241 return 0;
2242}
2243
2244/*
2245 * LVM calls this function before a (read-only) snapshot is created. This
2246 * gives us a chance to flush the journal completely and mark the fs clean.
2247 */
2248static void ext3_write_super_lockfs(struct super_block *sb)
2249{
2250 sb->s_dirt = 0;
2251
2252 if (!(sb->s_flags & MS_RDONLY)) {
2253 journal_t *journal = EXT3_SB(sb)->s_journal;
2254
2255 /* Now we set up the journal barrier. */
2256 journal_lock_updates(journal);
2257 journal_flush(journal);
2258
2259 /* Journal blocked and flushed, clear needs_recovery flag. */
2260 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2261 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2262 }
2263}
2264
2265/*
2266 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2267 * flag here, even though the filesystem is not technically dirty yet.
2268 */
2269static void ext3_unlockfs(struct super_block *sb)
2270{
2271 if (!(sb->s_flags & MS_RDONLY)) {
2272 lock_super(sb);
2273 /* Reser the needs_recovery flag before the fs is unlocked. */
2274 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2275 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2276 unlock_super(sb);
2277 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2278 }
2279}
2280
2281static int ext3_remount (struct super_block * sb, int * flags, char * data)
2282{
2283 struct ext3_super_block * es;
2284 struct ext3_sb_info *sbi = EXT3_SB(sb);
Mingming Cao43d23f92006-06-25 05:48:07 -07002285 ext3_fsblk_t n_blocks_count = 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002286 unsigned long old_sb_flags;
2287 struct ext3_mount_options old_opts;
2288 int err;
2289#ifdef CONFIG_QUOTA
2290 int i;
2291#endif
2292
2293 /* Store the original options */
2294 old_sb_flags = sb->s_flags;
2295 old_opts.s_mount_opt = sbi->s_mount_opt;
2296 old_opts.s_resuid = sbi->s_resuid;
2297 old_opts.s_resgid = sbi->s_resgid;
2298 old_opts.s_commit_interval = sbi->s_commit_interval;
2299#ifdef CONFIG_QUOTA
2300 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2301 for (i = 0; i < MAXQUOTAS; i++)
2302 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2303#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002304
2305 /*
2306 * Allow the "check" option to be passed as a remount option.
2307 */
Johann Lombardi71b96252006-01-08 01:03:20 -08002308 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002309 err = -EINVAL;
2310 goto restore_opts;
2311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312
2313 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2314 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2315
2316 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2317 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2318
2319 es = sbi->s_es;
2320
2321 ext3_init_journal_params(sb, sbi->s_journal);
2322
2323 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2324 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
Jan Kara08c6a962005-07-12 13:58:28 -07002325 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2326 err = -EROFS;
2327 goto restore_opts;
2328 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329
2330 if (*flags & MS_RDONLY) {
2331 /*
2332 * First of all, the unconditional stuff we have to do
2333 * to disable replay of the journal when we next remount
2334 */
2335 sb->s_flags |= MS_RDONLY;
2336
2337 /*
2338 * OK, test if we are remounting a valid rw partition
2339 * readonly, and if so set the rdonly flag and then
2340 * mark the partition as valid again.
2341 */
2342 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2343 (sbi->s_mount_state & EXT3_VALID_FS))
2344 es->s_state = cpu_to_le16(sbi->s_mount_state);
2345
Jan Kara030703e2007-07-15 23:41:08 -07002346 /*
2347 * We have to unlock super so that we can wait for
2348 * transactions.
2349 */
2350 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002351 ext3_mark_recovery_complete(sb, es);
Jan Kara030703e2007-07-15 23:41:08 -07002352 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353 } else {
2354 __le32 ret;
2355 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2356 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2357 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2358 "remount RDWR because of unsupported "
2359 "optional features (%x).\n",
2360 sb->s_id, le32_to_cpu(ret));
Jan Kara08c6a962005-07-12 13:58:28 -07002361 err = -EROFS;
2362 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 }
Eric Sandeenea9a05a2007-02-10 01:46:07 -08002364
2365 /*
2366 * If we have an unprocessed orphan list hanging
2367 * around from a previously readonly bdev mount,
2368 * require a full umount/remount for now.
2369 */
2370 if (es->s_last_orphan) {
2371 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2372 "remount RDWR because of unprocessed "
2373 "orphan inode list. Please "
2374 "umount/remount instead.\n",
2375 sb->s_id);
2376 err = -EINVAL;
2377 goto restore_opts;
2378 }
2379
Linus Torvalds1da177e2005-04-16 15:20:36 -07002380 /*
2381 * Mounting a RDONLY partition read-write, so reread
2382 * and store the current valid flag. (It may have
2383 * been changed by e2fsck since we originally mounted
2384 * the partition.)
2385 */
2386 ext3_clear_journal_err(sb, es);
2387 sbi->s_mount_state = le16_to_cpu(es->s_state);
Dave Kleikampa4e4de32006-09-27 01:49:36 -07002388 if ((err = ext3_group_extend(sb, es, n_blocks_count)))
Jan Kara08c6a962005-07-12 13:58:28 -07002389 goto restore_opts;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002390 if (!ext3_setup_super (sb, es, 0))
2391 sb->s_flags &= ~MS_RDONLY;
2392 }
2393 }
Jan Kara08c6a962005-07-12 13:58:28 -07002394#ifdef CONFIG_QUOTA
2395 /* Release old quota file names */
2396 for (i = 0; i < MAXQUOTAS; i++)
2397 if (old_opts.s_qf_names[i] &&
2398 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2399 kfree(old_opts.s_qf_names[i]);
2400#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002401 return 0;
Jan Kara08c6a962005-07-12 13:58:28 -07002402restore_opts:
2403 sb->s_flags = old_sb_flags;
2404 sbi->s_mount_opt = old_opts.s_mount_opt;
2405 sbi->s_resuid = old_opts.s_resuid;
2406 sbi->s_resgid = old_opts.s_resgid;
2407 sbi->s_commit_interval = old_opts.s_commit_interval;
2408#ifdef CONFIG_QUOTA
2409 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2410 for (i = 0; i < MAXQUOTAS; i++) {
2411 if (sbi->s_qf_names[i] &&
2412 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2413 kfree(sbi->s_qf_names[i]);
2414 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2415 }
2416#endif
2417 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002418}
2419
David Howells726c3342006-06-23 02:02:58 -07002420static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421{
David Howells726c3342006-06-23 02:02:58 -07002422 struct super_block *sb = dentry->d_sb;
Alex Tomas09fe3162006-03-24 03:16:16 -08002423 struct ext3_sb_info *sbi = EXT3_SB(sb);
2424 struct ext3_super_block *es = sbi->s_es;
Mingming Cao43d23f92006-06-25 05:48:07 -07002425 ext3_fsblk_t overhead;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002426 int i;
Pekka Enberg50ee0a32006-12-06 20:35:28 -08002427 u64 fsid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428
2429 if (test_opt (sb, MINIX_DF))
2430 overhead = 0;
2431 else {
2432 unsigned long ngroups;
2433 ngroups = EXT3_SB(sb)->s_groups_count;
2434 smp_rmb();
2435
2436 /*
2437 * Compute the overhead (FS structures)
2438 */
2439
2440 /*
2441 * All of the blocks before first_data_block are
2442 * overhead
2443 */
2444 overhead = le32_to_cpu(es->s_first_data_block);
2445
2446 /*
2447 * Add the overhead attributed to the superblock and
2448 * block group descriptors. If the sparse superblocks
2449 * feature is turned on, then not all groups have this.
2450 */
2451 for (i = 0; i < ngroups; i++) {
2452 overhead += ext3_bg_has_super(sb, i) +
2453 ext3_bg_num_gdb(sb, i);
2454 cond_resched();
2455 }
2456
2457 /*
2458 * Every block group has an inode bitmap, a block
2459 * bitmap, and an inode table.
2460 */
2461 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2462 }
2463
2464 buf->f_type = EXT3_SUPER_MAGIC;
2465 buf->f_bsize = sb->s_blocksize;
2466 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
Alex Tomas09fe3162006-03-24 03:16:16 -08002467 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2469 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2470 buf->f_bavail = 0;
2471 buf->f_files = le32_to_cpu(es->s_inodes_count);
Alex Tomas09fe3162006-03-24 03:16:16 -08002472 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473 buf->f_namelen = EXT3_NAME_LEN;
Pekka Enberg50ee0a32006-12-06 20:35:28 -08002474 fsid = le64_to_cpup((void *)es->s_uuid) ^
2475 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2476 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2477 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478 return 0;
2479}
2480
2481/* Helper function for writing quotas on sync - we need to start transaction before quota file
2482 * is locked for write. Otherwise the are possible deadlocks:
2483 * Process 1 Process 2
2484 * ext3_create() quota_sync()
2485 * journal_start() write_dquot()
Ingo Molnard3be9152006-03-23 03:00:29 -08002486 * DQUOT_INIT() down(dqio_mutex)
2487 * down(dqio_mutex) journal_start()
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488 *
2489 */
2490
2491#ifdef CONFIG_QUOTA
2492
2493static inline struct inode *dquot_to_inode(struct dquot *dquot)
2494{
2495 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2496}
2497
2498static int ext3_dquot_initialize(struct inode *inode, int type)
2499{
2500 handle_t *handle;
2501 int ret, err;
2502
2503 /* We may create quota structure so we need to reserve enough blocks */
Jan Kara1f545872005-06-23 22:01:04 -07002504 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002505 if (IS_ERR(handle))
2506 return PTR_ERR(handle);
2507 ret = dquot_initialize(inode, type);
2508 err = ext3_journal_stop(handle);
2509 if (!ret)
2510 ret = err;
2511 return ret;
2512}
2513
2514static int ext3_dquot_drop(struct inode *inode)
2515{
2516 handle_t *handle;
2517 int ret, err;
2518
2519 /* We may delete quota structure so we need to reserve enough blocks */
Jan Kara1f545872005-06-23 22:01:04 -07002520 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 if (IS_ERR(handle))
2522 return PTR_ERR(handle);
2523 ret = dquot_drop(inode);
2524 err = ext3_journal_stop(handle);
2525 if (!ret)
2526 ret = err;
2527 return ret;
2528}
2529
2530static int ext3_write_dquot(struct dquot *dquot)
2531{
2532 int ret, err;
2533 handle_t *handle;
2534 struct inode *inode;
2535
2536 inode = dquot_to_inode(dquot);
2537 handle = ext3_journal_start(inode,
Jan Kara1f545872005-06-23 22:01:04 -07002538 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002539 if (IS_ERR(handle))
2540 return PTR_ERR(handle);
2541 ret = dquot_commit(dquot);
2542 err = ext3_journal_stop(handle);
2543 if (!ret)
2544 ret = err;
2545 return ret;
2546}
2547
2548static int ext3_acquire_dquot(struct dquot *dquot)
2549{
2550 int ret, err;
2551 handle_t *handle;
2552
2553 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002554 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555 if (IS_ERR(handle))
2556 return PTR_ERR(handle);
2557 ret = dquot_acquire(dquot);
2558 err = ext3_journal_stop(handle);
2559 if (!ret)
2560 ret = err;
2561 return ret;
2562}
2563
2564static int ext3_release_dquot(struct dquot *dquot)
2565{
2566 int ret, err;
2567 handle_t *handle;
2568
2569 handle = ext3_journal_start(dquot_to_inode(dquot),
Jan Kara1f545872005-06-23 22:01:04 -07002570 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002571 if (IS_ERR(handle))
2572 return PTR_ERR(handle);
2573 ret = dquot_release(dquot);
2574 err = ext3_journal_stop(handle);
2575 if (!ret)
2576 ret = err;
2577 return ret;
2578}
2579
2580static int ext3_mark_dquot_dirty(struct dquot *dquot)
2581{
2582 /* Are we journalling quotas? */
2583 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2584 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2585 dquot_mark_dquot_dirty(dquot);
2586 return ext3_write_dquot(dquot);
2587 } else {
2588 return dquot_mark_dquot_dirty(dquot);
2589 }
2590}
2591
2592static int ext3_write_info(struct super_block *sb, int type)
2593{
2594 int ret, err;
2595 handle_t *handle;
2596
2597 /* Data block + inode block */
2598 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2599 if (IS_ERR(handle))
2600 return PTR_ERR(handle);
2601 ret = dquot_commit_info(sb, type);
2602 err = ext3_journal_stop(handle);
2603 if (!ret)
2604 ret = err;
2605 return ret;
2606}
2607
2608/*
2609 * Turn on quotas during mount time - we need to find
2610 * the quota file and such...
2611 */
2612static int ext3_quota_on_mount(struct super_block *sb, int type)
2613{
Christoph Hellwig84de8562005-06-23 00:09:16 -07002614 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2615 EXT3_SB(sb)->s_jquota_fmt, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616}
2617
2618/*
2619 * Standard function to be called on quota_on
2620 */
2621static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2622 char *path)
2623{
2624 int err;
2625 struct nameidata nd;
2626
Jan Kara1f545872005-06-23 22:01:04 -07002627 if (!test_opt(sb, QUOTA))
2628 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629 /* Not journalling quota? */
2630 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2631 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2632 return vfs_quota_on(sb, type, format_id, path);
2633 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2634 if (err)
2635 return err;
2636 /* Quotafile not on the same filesystem? */
2637 if (nd.mnt->mnt_sb != sb) {
2638 path_release(&nd);
2639 return -EXDEV;
2640 }
2641 /* Quotafile not of fs root? */
2642 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2643 printk(KERN_WARNING
2644 "EXT3-fs: Quota file not on filesystem root. "
2645 "Journalled quota will not work.\n");
2646 path_release(&nd);
2647 return vfs_quota_on(sb, type, format_id, path);
2648}
2649
2650/* Read data from quotafile - avoid pagecache and such because we cannot afford
2651 * acquiring the locks... As quota files are never truncated and quota code
2652 * itself serializes the operations (and noone else should touch the files)
2653 * we don't have to be afraid of races */
2654static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2655 size_t len, loff_t off)
2656{
2657 struct inode *inode = sb_dqopt(sb)->files[type];
2658 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2659 int err = 0;
2660 int offset = off & (sb->s_blocksize - 1);
2661 int tocopy;
2662 size_t toread;
2663 struct buffer_head *bh;
2664 loff_t i_size = i_size_read(inode);
2665
2666 if (off > i_size)
2667 return 0;
2668 if (off+len > i_size)
2669 len = i_size-off;
2670 toread = len;
2671 while (toread > 0) {
2672 tocopy = sb->s_blocksize - offset < toread ?
2673 sb->s_blocksize - offset : toread;
2674 bh = ext3_bread(NULL, inode, blk, 0, &err);
2675 if (err)
2676 return err;
2677 if (!bh) /* A hole? */
2678 memset(data, 0, tocopy);
2679 else
2680 memcpy(data, bh->b_data+offset, tocopy);
2681 brelse(bh);
2682 offset = 0;
2683 toread -= tocopy;
2684 data += tocopy;
2685 blk++;
2686 }
2687 return len;
2688}
2689
2690/* Write to quotafile (we know the transaction is already started and has
2691 * enough credits) */
2692static ssize_t ext3_quota_write(struct super_block *sb, int type,
2693 const char *data, size_t len, loff_t off)
2694{
2695 struct inode *inode = sb_dqopt(sb)->files[type];
2696 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2697 int err = 0;
2698 int offset = off & (sb->s_blocksize - 1);
2699 int tocopy;
2700 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2701 size_t towrite = len;
2702 struct buffer_head *bh;
2703 handle_t *handle = journal_current_handle();
2704
Arjan van de Ven5c81a412006-07-03 00:25:20 -07002705 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706 while (towrite > 0) {
2707 tocopy = sb->s_blocksize - offset < towrite ?
2708 sb->s_blocksize - offset : towrite;
2709 bh = ext3_bread(handle, inode, blk, 1, &err);
2710 if (!bh)
2711 goto out;
2712 if (journal_quota) {
2713 err = ext3_journal_get_write_access(handle, bh);
2714 if (err) {
2715 brelse(bh);
2716 goto out;
2717 }
2718 }
2719 lock_buffer(bh);
2720 memcpy(bh->b_data+offset, data, tocopy);
2721 flush_dcache_page(bh->b_page);
2722 unlock_buffer(bh);
2723 if (journal_quota)
2724 err = ext3_journal_dirty_metadata(handle, bh);
2725 else {
2726 /* Always do at least ordered writes for quotas */
2727 err = ext3_journal_dirty_data(handle, bh);
2728 mark_buffer_dirty(bh);
2729 }
2730 brelse(bh);
2731 if (err)
2732 goto out;
2733 offset = 0;
2734 towrite -= tocopy;
2735 data += tocopy;
2736 blk++;
2737 }
2738out:
2739 if (len == towrite)
2740 return err;
2741 if (inode->i_size < off+len-towrite) {
2742 i_size_write(inode, off+len-towrite);
2743 EXT3_I(inode)->i_disksize = inode->i_size;
2744 }
2745 inode->i_version++;
2746 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2747 ext3_mark_inode_dirty(handle, inode);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002748 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749 return len - towrite;
2750}
2751
2752#endif
2753
David Howells454e2392006-06-23 02:02:57 -07002754static int ext3_get_sb(struct file_system_type *fs_type,
2755 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002756{
David Howells454e2392006-06-23 02:02:57 -07002757 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758}
2759
2760static struct file_system_type ext3_fs_type = {
2761 .owner = THIS_MODULE,
2762 .name = "ext3",
2763 .get_sb = ext3_get_sb,
2764 .kill_sb = kill_block_super,
2765 .fs_flags = FS_REQUIRES_DEV,
2766};
2767
2768static int __init init_ext3_fs(void)
2769{
2770 int err = init_ext3_xattr();
2771 if (err)
2772 return err;
2773 err = init_inodecache();
2774 if (err)
2775 goto out1;
2776 err = register_filesystem(&ext3_fs_type);
2777 if (err)
2778 goto out;
2779 return 0;
2780out:
2781 destroy_inodecache();
2782out1:
Dave Kleikampe9ad5622006-09-27 01:49:35 -07002783 exit_ext3_xattr();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784 return err;
2785}
2786
2787static void __exit exit_ext3_fs(void)
2788{
2789 unregister_filesystem(&ext3_fs_type);
2790 destroy_inodecache();
2791 exit_ext3_xattr();
2792}
2793
2794MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2795MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2796MODULE_LICENSE("GPL");
2797module_init(init_ext3_fs)
2798module_exit(exit_ext3_fs)