diff options
Diffstat (limited to 'fs/ext3/super.c')
-rw-r--r-- | fs/ext3/super.c | 2539 |
1 files changed, 2539 insertions, 0 deletions
diff --git a/fs/ext3/super.c b/fs/ext3/super.c new file mode 100644 index 000000000000..545b440a2d2f --- /dev/null +++ b/fs/ext3/super.c | |||
@@ -0,0 +1,2539 @@ | |||
1 | /* | ||
2 | * linux/fs/ext3/super.c | ||
3 | * | ||
4 | * Copyright (C) 1992, 1993, 1994, 1995 | ||
5 | * Remy Card (card@masi.ibp.fr) | ||
6 | * Laboratoire MASI - Institut Blaise Pascal | ||
7 | * Universite Pierre et Marie Curie (Paris VI) | ||
8 | * | ||
9 | * from | ||
10 | * | ||
11 | * linux/fs/minix/inode.c | ||
12 | * | ||
13 | * Copyright (C) 1991, 1992 Linus Torvalds | ||
14 | * | ||
15 | * Big-endian to little-endian byte-swapping/bitmaps by | ||
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | ||
17 | */ | ||
18 | |||
19 | #include <linux/config.h> | ||
20 | #include <linux/module.h> | ||
21 | #include <linux/string.h> | ||
22 | #include <linux/fs.h> | ||
23 | #include <linux/time.h> | ||
24 | #include <linux/jbd.h> | ||
25 | #include <linux/ext3_fs.h> | ||
26 | #include <linux/ext3_jbd.h> | ||
27 | #include <linux/slab.h> | ||
28 | #include <linux/init.h> | ||
29 | #include <linux/blkdev.h> | ||
30 | #include <linux/parser.h> | ||
31 | #include <linux/smp_lock.h> | ||
32 | #include <linux/buffer_head.h> | ||
33 | #include <linux/vfs.h> | ||
34 | #include <linux/random.h> | ||
35 | #include <linux/mount.h> | ||
36 | #include <linux/namei.h> | ||
37 | #include <linux/quotaops.h> | ||
38 | #include <asm/uaccess.h> | ||
39 | #include "xattr.h" | ||
40 | #include "acl.h" | ||
41 | |||
42 | static int ext3_load_journal(struct super_block *, struct ext3_super_block *); | ||
43 | static int ext3_create_journal(struct super_block *, struct ext3_super_block *, | ||
44 | int); | ||
45 | static void ext3_commit_super (struct super_block * sb, | ||
46 | struct ext3_super_block * es, | ||
47 | int sync); | ||
48 | static void ext3_mark_recovery_complete(struct super_block * sb, | ||
49 | struct ext3_super_block * es); | ||
50 | static void ext3_clear_journal_err(struct super_block * sb, | ||
51 | struct ext3_super_block * es); | ||
52 | static int ext3_sync_fs(struct super_block *sb, int wait); | ||
53 | static const char *ext3_decode_error(struct super_block * sb, int errno, | ||
54 | char nbuf[16]); | ||
55 | static int ext3_remount (struct super_block * sb, int * flags, char * data); | ||
56 | static int ext3_statfs (struct super_block * sb, struct kstatfs * buf); | ||
57 | static void ext3_unlockfs(struct super_block *sb); | ||
58 | static void ext3_write_super (struct super_block * sb); | ||
59 | static void ext3_write_super_lockfs(struct super_block *sb); | ||
60 | |||
61 | /* | ||
62 | * Wrappers for journal_start/end. | ||
63 | * | ||
64 | * The only special thing we need to do here is to make sure that all | ||
65 | * journal_end calls result in the superblock being marked dirty, so | ||
66 | * that sync() will call the filesystem's write_super callback if | ||
67 | * appropriate. | ||
68 | */ | ||
69 | handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks) | ||
70 | { | ||
71 | journal_t *journal; | ||
72 | |||
73 | if (sb->s_flags & MS_RDONLY) | ||
74 | return ERR_PTR(-EROFS); | ||
75 | |||
76 | /* Special case here: if the journal has aborted behind our | ||
77 | * backs (eg. EIO in the commit thread), then we still need to | ||
78 | * take the FS itself readonly cleanly. */ | ||
79 | journal = EXT3_SB(sb)->s_journal; | ||
80 | if (is_journal_aborted(journal)) { | ||
81 | ext3_abort(sb, __FUNCTION__, | ||
82 | "Detected aborted journal"); | ||
83 | return ERR_PTR(-EROFS); | ||
84 | } | ||
85 | |||
86 | return journal_start(journal, nblocks); | ||
87 | } | ||
88 | |||
89 | /* | ||
90 | * The only special thing we need to do here is to make sure that all | ||
91 | * journal_stop calls result in the superblock being marked dirty, so | ||
92 | * that sync() will call the filesystem's write_super callback if | ||
93 | * appropriate. | ||
94 | */ | ||
95 | int __ext3_journal_stop(const char *where, handle_t *handle) | ||
96 | { | ||
97 | struct super_block *sb; | ||
98 | int err; | ||
99 | int rc; | ||
100 | |||
101 | sb = handle->h_transaction->t_journal->j_private; | ||
102 | err = handle->h_err; | ||
103 | rc = journal_stop(handle); | ||
104 | |||
105 | if (!err) | ||
106 | err = rc; | ||
107 | if (err) | ||
108 | __ext3_std_error(sb, where, err); | ||
109 | return err; | ||
110 | } | ||
111 | |||
112 | void ext3_journal_abort_handle(const char *caller, const char *err_fn, | ||
113 | struct buffer_head *bh, handle_t *handle, int err) | ||
114 | { | ||
115 | char nbuf[16]; | ||
116 | const char *errstr = ext3_decode_error(NULL, err, nbuf); | ||
117 | |||
118 | if (bh) | ||
119 | BUFFER_TRACE(bh, "abort"); | ||
120 | |||
121 | if (!handle->h_err) | ||
122 | handle->h_err = err; | ||
123 | |||
124 | if (is_handle_aborted(handle)) | ||
125 | return; | ||
126 | |||
127 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | ||
128 | caller, errstr, err_fn); | ||
129 | |||
130 | journal_abort_handle(handle); | ||
131 | } | ||
132 | |||
133 | /* Deal with the reporting of failure conditions on a filesystem such as | ||
134 | * inconsistencies detected or read IO failures. | ||
135 | * | ||
136 | * On ext2, we can store the error state of the filesystem in the | ||
137 | * superblock. That is not possible on ext3, because we may have other | ||
138 | * write ordering constraints on the superblock which prevent us from | ||
139 | * writing it out straight away; and given that the journal is about to | ||
140 | * be aborted, we can't rely on the current, or future, transactions to | ||
141 | * write out the superblock safely. | ||
142 | * | ||
143 | * We'll just use the journal_abort() error code to record an error in | ||
144 | * the journal instead. On recovery, the journal will compain about | ||
145 | * that error until we've noted it down and cleared it. | ||
146 | */ | ||
147 | |||
148 | static void ext3_handle_error(struct super_block *sb) | ||
149 | { | ||
150 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | ||
151 | |||
152 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | ||
153 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); | ||
154 | |||
155 | if (sb->s_flags & MS_RDONLY) | ||
156 | return; | ||
157 | |||
158 | if (test_opt (sb, ERRORS_RO)) { | ||
159 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | ||
160 | sb->s_flags |= MS_RDONLY; | ||
161 | } else { | ||
162 | journal_t *journal = EXT3_SB(sb)->s_journal; | ||
163 | |||
164 | EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; | ||
165 | if (journal) | ||
166 | journal_abort(journal, -EIO); | ||
167 | } | ||
168 | if (test_opt(sb, ERRORS_PANIC)) | ||
169 | panic("EXT3-fs (device %s): panic forced after error\n", | ||
170 | sb->s_id); | ||
171 | ext3_commit_super(sb, es, 1); | ||
172 | } | ||
173 | |||
174 | void ext3_error (struct super_block * sb, const char * function, | ||
175 | const char * fmt, ...) | ||
176 | { | ||
177 | va_list args; | ||
178 | |||
179 | va_start(args, fmt); | ||
180 | printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function); | ||
181 | vprintk(fmt, args); | ||
182 | printk("\n"); | ||
183 | va_end(args); | ||
184 | |||
185 | ext3_handle_error(sb); | ||
186 | } | ||
187 | |||
188 | static const char *ext3_decode_error(struct super_block * sb, int errno, | ||
189 | char nbuf[16]) | ||
190 | { | ||
191 | char *errstr = NULL; | ||
192 | |||
193 | switch (errno) { | ||
194 | case -EIO: | ||
195 | errstr = "IO failure"; | ||
196 | break; | ||
197 | case -ENOMEM: | ||
198 | errstr = "Out of memory"; | ||
199 | break; | ||
200 | case -EROFS: | ||
201 | if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) | ||
202 | errstr = "Journal has aborted"; | ||
203 | else | ||
204 | errstr = "Readonly filesystem"; | ||
205 | break; | ||
206 | default: | ||
207 | /* If the caller passed in an extra buffer for unknown | ||
208 | * errors, textualise them now. Else we just return | ||
209 | * NULL. */ | ||
210 | if (nbuf) { | ||
211 | /* Check for truncated error codes... */ | ||
212 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | ||
213 | errstr = nbuf; | ||
214 | } | ||
215 | break; | ||
216 | } | ||
217 | |||
218 | return errstr; | ||
219 | } | ||
220 | |||
221 | /* __ext3_std_error decodes expected errors from journaling functions | ||
222 | * automatically and invokes the appropriate error response. */ | ||
223 | |||
224 | void __ext3_std_error (struct super_block * sb, const char * function, | ||
225 | int errno) | ||
226 | { | ||
227 | char nbuf[16]; | ||
228 | const char *errstr = ext3_decode_error(sb, errno, nbuf); | ||
229 | |||
230 | printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n", | ||
231 | sb->s_id, function, errstr); | ||
232 | |||
233 | ext3_handle_error(sb); | ||
234 | } | ||
235 | |||
236 | /* | ||
237 | * ext3_abort is a much stronger failure handler than ext3_error. The | ||
238 | * abort function may be used to deal with unrecoverable failures such | ||
239 | * as journal IO errors or ENOMEM at a critical moment in log management. | ||
240 | * | ||
241 | * We unconditionally force the filesystem into an ABORT|READONLY state, | ||
242 | * unless the error response on the fs has been set to panic in which | ||
243 | * case we take the easy way out and panic immediately. | ||
244 | */ | ||
245 | |||
246 | void ext3_abort (struct super_block * sb, const char * function, | ||
247 | const char * fmt, ...) | ||
248 | { | ||
249 | va_list args; | ||
250 | |||
251 | printk (KERN_CRIT "ext3_abort called.\n"); | ||
252 | |||
253 | va_start(args, fmt); | ||
254 | printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function); | ||
255 | vprintk(fmt, args); | ||
256 | printk("\n"); | ||
257 | va_end(args); | ||
258 | |||
259 | if (test_opt(sb, ERRORS_PANIC)) | ||
260 | panic("EXT3-fs panic from previous error\n"); | ||
261 | |||
262 | if (sb->s_flags & MS_RDONLY) | ||
263 | return; | ||
264 | |||
265 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | ||
266 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | ||
267 | sb->s_flags |= MS_RDONLY; | ||
268 | EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; | ||
269 | journal_abort(EXT3_SB(sb)->s_journal, -EIO); | ||
270 | } | ||
271 | |||
272 | void ext3_warning (struct super_block * sb, const char * function, | ||
273 | const char * fmt, ...) | ||
274 | { | ||
275 | va_list args; | ||
276 | |||
277 | va_start(args, fmt); | ||
278 | printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ", | ||
279 | sb->s_id, function); | ||
280 | vprintk(fmt, args); | ||
281 | printk("\n"); | ||
282 | va_end(args); | ||
283 | } | ||
284 | |||
285 | void ext3_update_dynamic_rev(struct super_block *sb) | ||
286 | { | ||
287 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | ||
288 | |||
289 | if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) | ||
290 | return; | ||
291 | |||
292 | ext3_warning(sb, __FUNCTION__, | ||
293 | "updating to rev %d because of new feature flag, " | ||
294 | "running e2fsck is recommended", | ||
295 | EXT3_DYNAMIC_REV); | ||
296 | |||
297 | es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); | ||
298 | es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); | ||
299 | es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); | ||
300 | /* leave es->s_feature_*compat flags alone */ | ||
301 | /* es->s_uuid will be set by e2fsck if empty */ | ||
302 | |||
303 | /* | ||
304 | * The rest of the superblock fields should be zero, and if not it | ||
305 | * means they are likely already in use, so leave them alone. We | ||
306 | * can leave it up to e2fsck to clean up any inconsistencies there. | ||
307 | */ | ||
308 | } | ||
309 | |||
310 | /* | ||
311 | * Open the external journal device | ||
312 | */ | ||
313 | static struct block_device *ext3_blkdev_get(dev_t dev) | ||
314 | { | ||
315 | struct block_device *bdev; | ||
316 | char b[BDEVNAME_SIZE]; | ||
317 | |||
318 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | ||
319 | if (IS_ERR(bdev)) | ||
320 | goto fail; | ||
321 | return bdev; | ||
322 | |||
323 | fail: | ||
324 | printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n", | ||
325 | __bdevname(dev, b), PTR_ERR(bdev)); | ||
326 | return NULL; | ||
327 | } | ||
328 | |||
329 | /* | ||
330 | * Release the journal device | ||
331 | */ | ||
332 | static int ext3_blkdev_put(struct block_device *bdev) | ||
333 | { | ||
334 | bd_release(bdev); | ||
335 | return blkdev_put(bdev); | ||
336 | } | ||
337 | |||
338 | static int ext3_blkdev_remove(struct ext3_sb_info *sbi) | ||
339 | { | ||
340 | struct block_device *bdev; | ||
341 | int ret = -ENODEV; | ||
342 | |||
343 | bdev = sbi->journal_bdev; | ||
344 | if (bdev) { | ||
345 | ret = ext3_blkdev_put(bdev); | ||
346 | sbi->journal_bdev = NULL; | ||
347 | } | ||
348 | return ret; | ||
349 | } | ||
350 | |||
351 | static inline struct inode *orphan_list_entry(struct list_head *l) | ||
352 | { | ||
353 | return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; | ||
354 | } | ||
355 | |||
356 | static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) | ||
357 | { | ||
358 | struct list_head *l; | ||
359 | |||
360 | printk(KERN_ERR "sb orphan head is %d\n", | ||
361 | le32_to_cpu(sbi->s_es->s_last_orphan)); | ||
362 | |||
363 | printk(KERN_ERR "sb_info orphan list:\n"); | ||
364 | list_for_each(l, &sbi->s_orphan) { | ||
365 | struct inode *inode = orphan_list_entry(l); | ||
366 | printk(KERN_ERR " " | ||
367 | "inode %s:%ld at %p: mode %o, nlink %d, next %d\n", | ||
368 | inode->i_sb->s_id, inode->i_ino, inode, | ||
369 | inode->i_mode, inode->i_nlink, | ||
370 | NEXT_ORPHAN(inode)); | ||
371 | } | ||
372 | } | ||
373 | |||
374 | static void ext3_put_super (struct super_block * sb) | ||
375 | { | ||
376 | struct ext3_sb_info *sbi = EXT3_SB(sb); | ||
377 | struct ext3_super_block *es = sbi->s_es; | ||
378 | int i; | ||
379 | |||
380 | ext3_xattr_put_super(sb); | ||
381 | journal_destroy(sbi->s_journal); | ||
382 | if (!(sb->s_flags & MS_RDONLY)) { | ||
383 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | ||
384 | es->s_state = cpu_to_le16(sbi->s_mount_state); | ||
385 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | ||
386 | mark_buffer_dirty(sbi->s_sbh); | ||
387 | ext3_commit_super(sb, es, 1); | ||
388 | } | ||
389 | |||
390 | for (i = 0; i < sbi->s_gdb_count; i++) | ||
391 | brelse(sbi->s_group_desc[i]); | ||
392 | kfree(sbi->s_group_desc); | ||
393 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | ||
394 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | ||
395 | percpu_counter_destroy(&sbi->s_dirs_counter); | ||
396 | brelse(sbi->s_sbh); | ||
397 | #ifdef CONFIG_QUOTA | ||
398 | for (i = 0; i < MAXQUOTAS; i++) | ||
399 | kfree(sbi->s_qf_names[i]); | ||
400 | #endif | ||
401 | |||
402 | /* Debugging code just in case the in-memory inode orphan list | ||
403 | * isn't empty. The on-disk one can be non-empty if we've | ||
404 | * detected an error and taken the fs readonly, but the | ||
405 | * in-memory list had better be clean by this point. */ | ||
406 | if (!list_empty(&sbi->s_orphan)) | ||
407 | dump_orphan_list(sb, sbi); | ||
408 | J_ASSERT(list_empty(&sbi->s_orphan)); | ||
409 | |||
410 | invalidate_bdev(sb->s_bdev, 0); | ||
411 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { | ||
412 | /* | ||
413 | * Invalidate the journal device's buffers. We don't want them | ||
414 | * floating about in memory - the physical journal device may | ||
415 | * hotswapped, and it breaks the `ro-after' testing code. | ||
416 | */ | ||
417 | sync_blockdev(sbi->journal_bdev); | ||
418 | invalidate_bdev(sbi->journal_bdev, 0); | ||
419 | ext3_blkdev_remove(sbi); | ||
420 | } | ||
421 | sb->s_fs_info = NULL; | ||
422 | kfree(sbi); | ||
423 | return; | ||
424 | } | ||
425 | |||
426 | static kmem_cache_t *ext3_inode_cachep; | ||
427 | |||
428 | /* | ||
429 | * Called inside transaction, so use GFP_NOFS | ||
430 | */ | ||
431 | static struct inode *ext3_alloc_inode(struct super_block *sb) | ||
432 | { | ||
433 | struct ext3_inode_info *ei; | ||
434 | |||
435 | ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS); | ||
436 | if (!ei) | ||
437 | return NULL; | ||
438 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | ||
439 | ei->i_acl = EXT3_ACL_NOT_CACHED; | ||
440 | ei->i_default_acl = EXT3_ACL_NOT_CACHED; | ||
441 | #endif | ||
442 | ei->i_block_alloc_info = NULL; | ||
443 | ei->vfs_inode.i_version = 1; | ||
444 | return &ei->vfs_inode; | ||
445 | } | ||
446 | |||
447 | static void ext3_destroy_inode(struct inode *inode) | ||
448 | { | ||
449 | kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); | ||
450 | } | ||
451 | |||
452 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | ||
453 | { | ||
454 | struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; | ||
455 | |||
456 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | ||
457 | SLAB_CTOR_CONSTRUCTOR) { | ||
458 | INIT_LIST_HEAD(&ei->i_orphan); | ||
459 | #ifdef CONFIG_EXT3_FS_XATTR | ||
460 | init_rwsem(&ei->xattr_sem); | ||
461 | #endif | ||
462 | init_MUTEX(&ei->truncate_sem); | ||
463 | inode_init_once(&ei->vfs_inode); | ||
464 | } | ||
465 | } | ||
466 | |||
467 | static int init_inodecache(void) | ||
468 | { | ||
469 | ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", | ||
470 | sizeof(struct ext3_inode_info), | ||
471 | 0, SLAB_RECLAIM_ACCOUNT, | ||
472 | init_once, NULL); | ||
473 | if (ext3_inode_cachep == NULL) | ||
474 | return -ENOMEM; | ||
475 | return 0; | ||
476 | } | ||
477 | |||
478 | static void destroy_inodecache(void) | ||
479 | { | ||
480 | if (kmem_cache_destroy(ext3_inode_cachep)) | ||
481 | printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n"); | ||
482 | } | ||
483 | |||
484 | static void ext3_clear_inode(struct inode *inode) | ||
485 | { | ||
486 | struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info; | ||
487 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | ||
488 | if (EXT3_I(inode)->i_acl && | ||
489 | EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) { | ||
490 | posix_acl_release(EXT3_I(inode)->i_acl); | ||
491 | EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED; | ||
492 | } | ||
493 | if (EXT3_I(inode)->i_default_acl && | ||
494 | EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) { | ||
495 | posix_acl_release(EXT3_I(inode)->i_default_acl); | ||
496 | EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED; | ||
497 | } | ||
498 | #endif | ||
499 | ext3_discard_reservation(inode); | ||
500 | EXT3_I(inode)->i_block_alloc_info = NULL; | ||
501 | kfree(rsv); | ||
502 | } | ||
503 | |||
504 | #ifdef CONFIG_QUOTA | ||
505 | |||
506 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") | ||
507 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | ||
508 | |||
509 | static int ext3_dquot_initialize(struct inode *inode, int type); | ||
510 | static int ext3_dquot_drop(struct inode *inode); | ||
511 | static int ext3_write_dquot(struct dquot *dquot); | ||
512 | static int ext3_acquire_dquot(struct dquot *dquot); | ||
513 | static int ext3_release_dquot(struct dquot *dquot); | ||
514 | static int ext3_mark_dquot_dirty(struct dquot *dquot); | ||
515 | static int ext3_write_info(struct super_block *sb, int type); | ||
516 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path); | ||
517 | static int ext3_quota_on_mount(struct super_block *sb, int type); | ||
518 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, | ||
519 | size_t len, loff_t off); | ||
520 | static ssize_t ext3_quota_write(struct super_block *sb, int type, | ||
521 | const char *data, size_t len, loff_t off); | ||
522 | |||
523 | static struct dquot_operations ext3_quota_operations = { | ||
524 | .initialize = ext3_dquot_initialize, | ||
525 | .drop = ext3_dquot_drop, | ||
526 | .alloc_space = dquot_alloc_space, | ||
527 | .alloc_inode = dquot_alloc_inode, | ||
528 | .free_space = dquot_free_space, | ||
529 | .free_inode = dquot_free_inode, | ||
530 | .transfer = dquot_transfer, | ||
531 | .write_dquot = ext3_write_dquot, | ||
532 | .acquire_dquot = ext3_acquire_dquot, | ||
533 | .release_dquot = ext3_release_dquot, | ||
534 | .mark_dirty = ext3_mark_dquot_dirty, | ||
535 | .write_info = ext3_write_info | ||
536 | }; | ||
537 | |||
538 | static struct quotactl_ops ext3_qctl_operations = { | ||
539 | .quota_on = ext3_quota_on, | ||
540 | .quota_off = vfs_quota_off, | ||
541 | .quota_sync = vfs_quota_sync, | ||
542 | .get_info = vfs_get_dqinfo, | ||
543 | .set_info = vfs_set_dqinfo, | ||
544 | .get_dqblk = vfs_get_dqblk, | ||
545 | .set_dqblk = vfs_set_dqblk | ||
546 | }; | ||
547 | #endif | ||
548 | |||
549 | static struct super_operations ext3_sops = { | ||
550 | .alloc_inode = ext3_alloc_inode, | ||
551 | .destroy_inode = ext3_destroy_inode, | ||
552 | .read_inode = ext3_read_inode, | ||
553 | .write_inode = ext3_write_inode, | ||
554 | .dirty_inode = ext3_dirty_inode, | ||
555 | .delete_inode = ext3_delete_inode, | ||
556 | .put_super = ext3_put_super, | ||
557 | .write_super = ext3_write_super, | ||
558 | .sync_fs = ext3_sync_fs, | ||
559 | .write_super_lockfs = ext3_write_super_lockfs, | ||
560 | .unlockfs = ext3_unlockfs, | ||
561 | .statfs = ext3_statfs, | ||
562 | .remount_fs = ext3_remount, | ||
563 | .clear_inode = ext3_clear_inode, | ||
564 | #ifdef CONFIG_QUOTA | ||
565 | .quota_read = ext3_quota_read, | ||
566 | .quota_write = ext3_quota_write, | ||
567 | #endif | ||
568 | }; | ||
569 | |||
570 | struct dentry *ext3_get_parent(struct dentry *child); | ||
571 | static struct export_operations ext3_export_ops = { | ||
572 | .get_parent = ext3_get_parent, | ||
573 | }; | ||
574 | |||
575 | enum { | ||
576 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | ||
577 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | ||
578 | Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | ||
579 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | ||
580 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, | ||
581 | Opt_commit, Opt_journal_update, Opt_journal_inum, | ||
582 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | ||
583 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | ||
584 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, | ||
585 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, | ||
586 | }; | ||
587 | |||
588 | static match_table_t tokens = { | ||
589 | {Opt_bsd_df, "bsddf"}, | ||
590 | {Opt_minix_df, "minixdf"}, | ||
591 | {Opt_grpid, "grpid"}, | ||
592 | {Opt_grpid, "bsdgroups"}, | ||
593 | {Opt_nogrpid, "nogrpid"}, | ||
594 | {Opt_nogrpid, "sysvgroups"}, | ||
595 | {Opt_resgid, "resgid=%u"}, | ||
596 | {Opt_resuid, "resuid=%u"}, | ||
597 | {Opt_sb, "sb=%u"}, | ||
598 | {Opt_err_cont, "errors=continue"}, | ||
599 | {Opt_err_panic, "errors=panic"}, | ||
600 | {Opt_err_ro, "errors=remount-ro"}, | ||
601 | {Opt_nouid32, "nouid32"}, | ||
602 | {Opt_nocheck, "nocheck"}, | ||
603 | {Opt_nocheck, "check=none"}, | ||
604 | {Opt_check, "check"}, | ||
605 | {Opt_debug, "debug"}, | ||
606 | {Opt_oldalloc, "oldalloc"}, | ||
607 | {Opt_orlov, "orlov"}, | ||
608 | {Opt_user_xattr, "user_xattr"}, | ||
609 | {Opt_nouser_xattr, "nouser_xattr"}, | ||
610 | {Opt_acl, "acl"}, | ||
611 | {Opt_noacl, "noacl"}, | ||
612 | {Opt_reservation, "reservation"}, | ||
613 | {Opt_noreservation, "noreservation"}, | ||
614 | {Opt_noload, "noload"}, | ||
615 | {Opt_nobh, "nobh"}, | ||
616 | {Opt_commit, "commit=%u"}, | ||
617 | {Opt_journal_update, "journal=update"}, | ||
618 | {Opt_journal_inum, "journal=%u"}, | ||
619 | {Opt_abort, "abort"}, | ||
620 | {Opt_data_journal, "data=journal"}, | ||
621 | {Opt_data_ordered, "data=ordered"}, | ||
622 | {Opt_data_writeback, "data=writeback"}, | ||
623 | {Opt_offusrjquota, "usrjquota="}, | ||
624 | {Opt_usrjquota, "usrjquota=%s"}, | ||
625 | {Opt_offgrpjquota, "grpjquota="}, | ||
626 | {Opt_grpjquota, "grpjquota=%s"}, | ||
627 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | ||
628 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | ||
629 | {Opt_ignore, "grpquota"}, | ||
630 | {Opt_ignore, "noquota"}, | ||
631 | {Opt_ignore, "quota"}, | ||
632 | {Opt_ignore, "usrquota"}, | ||
633 | {Opt_barrier, "barrier=%u"}, | ||
634 | {Opt_err, NULL}, | ||
635 | {Opt_resize, "resize"}, | ||
636 | }; | ||
637 | |||
638 | static unsigned long get_sb_block(void **data) | ||
639 | { | ||
640 | unsigned long sb_block; | ||
641 | char *options = (char *) *data; | ||
642 | |||
643 | if (!options || strncmp(options, "sb=", 3) != 0) | ||
644 | return 1; /* Default location */ | ||
645 | options += 3; | ||
646 | sb_block = simple_strtoul(options, &options, 0); | ||
647 | if (*options && *options != ',') { | ||
648 | printk("EXT3-fs: Invalid sb specification: %s\n", | ||
649 | (char *) *data); | ||
650 | return 1; | ||
651 | } | ||
652 | if (*options == ',') | ||
653 | options++; | ||
654 | *data = (void *) options; | ||
655 | return sb_block; | ||
656 | } | ||
657 | |||
658 | static int parse_options (char * options, struct super_block *sb, | ||
659 | unsigned long * inum, unsigned long *n_blocks_count, int is_remount) | ||
660 | { | ||
661 | struct ext3_sb_info *sbi = EXT3_SB(sb); | ||
662 | char * p; | ||
663 | substring_t args[MAX_OPT_ARGS]; | ||
664 | int data_opt = 0; | ||
665 | int option; | ||
666 | #ifdef CONFIG_QUOTA | ||
667 | int qtype; | ||
668 | char *qname; | ||
669 | #endif | ||
670 | |||
671 | if (!options) | ||
672 | return 1; | ||
673 | |||
674 | while ((p = strsep (&options, ",")) != NULL) { | ||
675 | int token; | ||
676 | if (!*p) | ||
677 | continue; | ||
678 | |||
679 | token = match_token(p, tokens, args); | ||
680 | switch (token) { | ||
681 | case Opt_bsd_df: | ||
682 | clear_opt (sbi->s_mount_opt, MINIX_DF); | ||
683 | break; | ||
684 | case Opt_minix_df: | ||
685 | set_opt (sbi->s_mount_opt, MINIX_DF); | ||
686 | break; | ||
687 | case Opt_grpid: | ||
688 | set_opt (sbi->s_mount_opt, GRPID); | ||
689 | break; | ||
690 | case Opt_nogrpid: | ||
691 | clear_opt (sbi->s_mount_opt, GRPID); | ||
692 | break; | ||
693 | case Opt_resuid: | ||
694 | if (match_int(&args[0], &option)) | ||
695 | return 0; | ||
696 | sbi->s_resuid = option; | ||
697 | break; | ||
698 | case Opt_resgid: | ||
699 | if (match_int(&args[0], &option)) | ||
700 | return 0; | ||
701 | sbi->s_resgid = option; | ||
702 | break; | ||
703 | case Opt_sb: | ||
704 | /* handled by get_sb_block() instead of here */ | ||
705 | /* *sb_block = match_int(&args[0]); */ | ||
706 | break; | ||
707 | case Opt_err_panic: | ||
708 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | ||
709 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | ||
710 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | ||
711 | break; | ||
712 | case Opt_err_ro: | ||
713 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | ||
714 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | ||
715 | set_opt (sbi->s_mount_opt, ERRORS_RO); | ||
716 | break; | ||
717 | case Opt_err_cont: | ||
718 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | ||
719 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | ||
720 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | ||
721 | break; | ||
722 | case Opt_nouid32: | ||
723 | set_opt (sbi->s_mount_opt, NO_UID32); | ||
724 | break; | ||
725 | case Opt_check: | ||
726 | #ifdef CONFIG_EXT3_CHECK | ||
727 | set_opt (sbi->s_mount_opt, CHECK); | ||
728 | #else | ||
729 | printk(KERN_ERR | ||
730 | "EXT3 Check option not supported\n"); | ||
731 | #endif | ||
732 | break; | ||
733 | case Opt_nocheck: | ||
734 | clear_opt (sbi->s_mount_opt, CHECK); | ||
735 | break; | ||
736 | case Opt_debug: | ||
737 | set_opt (sbi->s_mount_opt, DEBUG); | ||
738 | break; | ||
739 | case Opt_oldalloc: | ||
740 | set_opt (sbi->s_mount_opt, OLDALLOC); | ||
741 | break; | ||
742 | case Opt_orlov: | ||
743 | clear_opt (sbi->s_mount_opt, OLDALLOC); | ||
744 | break; | ||
745 | #ifdef CONFIG_EXT3_FS_XATTR | ||
746 | case Opt_user_xattr: | ||
747 | set_opt (sbi->s_mount_opt, XATTR_USER); | ||
748 | break; | ||
749 | case Opt_nouser_xattr: | ||
750 | clear_opt (sbi->s_mount_opt, XATTR_USER); | ||
751 | break; | ||
752 | #else | ||
753 | case Opt_user_xattr: | ||
754 | case Opt_nouser_xattr: | ||
755 | printk("EXT3 (no)user_xattr options not supported\n"); | ||
756 | break; | ||
757 | #endif | ||
758 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | ||
759 | case Opt_acl: | ||
760 | set_opt(sbi->s_mount_opt, POSIX_ACL); | ||
761 | break; | ||
762 | case Opt_noacl: | ||
763 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | ||
764 | break; | ||
765 | #else | ||
766 | case Opt_acl: | ||
767 | case Opt_noacl: | ||
768 | printk("EXT3 (no)acl options not supported\n"); | ||
769 | break; | ||
770 | #endif | ||
771 | case Opt_reservation: | ||
772 | set_opt(sbi->s_mount_opt, RESERVATION); | ||
773 | break; | ||
774 | case Opt_noreservation: | ||
775 | clear_opt(sbi->s_mount_opt, RESERVATION); | ||
776 | break; | ||
777 | case Opt_journal_update: | ||
778 | /* @@@ FIXME */ | ||
779 | /* Eventually we will want to be able to create | ||
780 | a journal file here. For now, only allow the | ||
781 | user to specify an existing inode to be the | ||
782 | journal file. */ | ||
783 | if (is_remount) { | ||
784 | printk(KERN_ERR "EXT3-fs: cannot specify " | ||
785 | "journal on remount\n"); | ||
786 | return 0; | ||
787 | } | ||
788 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | ||
789 | break; | ||
790 | case Opt_journal_inum: | ||
791 | if (is_remount) { | ||
792 | printk(KERN_ERR "EXT3-fs: cannot specify " | ||
793 | "journal on remount\n"); | ||
794 | return 0; | ||
795 | } | ||
796 | if (match_int(&args[0], &option)) | ||
797 | return 0; | ||
798 | *inum = option; | ||
799 | break; | ||
800 | case Opt_noload: | ||
801 | set_opt (sbi->s_mount_opt, NOLOAD); | ||
802 | break; | ||
803 | case Opt_commit: | ||
804 | if (match_int(&args[0], &option)) | ||
805 | return 0; | ||
806 | if (option < 0) | ||
807 | return 0; | ||
808 | if (option == 0) | ||
809 | option = JBD_DEFAULT_MAX_COMMIT_AGE; | ||
810 | sbi->s_commit_interval = HZ * option; | ||
811 | break; | ||
812 | case Opt_data_journal: | ||
813 | data_opt = EXT3_MOUNT_JOURNAL_DATA; | ||
814 | goto datacheck; | ||
815 | case Opt_data_ordered: | ||
816 | data_opt = EXT3_MOUNT_ORDERED_DATA; | ||
817 | goto datacheck; | ||
818 | case Opt_data_writeback: | ||
819 | data_opt = EXT3_MOUNT_WRITEBACK_DATA; | ||
820 | datacheck: | ||
821 | if (is_remount) { | ||
822 | if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS) | ||
823 | != data_opt) { | ||
824 | printk(KERN_ERR | ||
825 | "EXT3-fs: cannot change data " | ||
826 | "mode on remount\n"); | ||
827 | return 0; | ||
828 | } | ||
829 | } else { | ||
830 | sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS; | ||
831 | sbi->s_mount_opt |= data_opt; | ||
832 | } | ||
833 | break; | ||
834 | #ifdef CONFIG_QUOTA | ||
835 | case Opt_usrjquota: | ||
836 | qtype = USRQUOTA; | ||
837 | goto set_qf_name; | ||
838 | case Opt_grpjquota: | ||
839 | qtype = GRPQUOTA; | ||
840 | set_qf_name: | ||
841 | if (sb_any_quota_enabled(sb)) { | ||
842 | printk(KERN_ERR | ||
843 | "EXT3-fs: Cannot change journalled " | ||
844 | "quota options when quota turned on.\n"); | ||
845 | return 0; | ||
846 | } | ||
847 | qname = match_strdup(&args[0]); | ||
848 | if (!qname) { | ||
849 | printk(KERN_ERR | ||
850 | "EXT3-fs: not enough memory for " | ||
851 | "storing quotafile name.\n"); | ||
852 | return 0; | ||
853 | } | ||
854 | if (sbi->s_qf_names[qtype] && | ||
855 | strcmp(sbi->s_qf_names[qtype], qname)) { | ||
856 | printk(KERN_ERR | ||
857 | "EXT3-fs: %s quota file already " | ||
858 | "specified.\n", QTYPE2NAME(qtype)); | ||
859 | kfree(qname); | ||
860 | return 0; | ||
861 | } | ||
862 | sbi->s_qf_names[qtype] = qname; | ||
863 | if (strchr(sbi->s_qf_names[qtype], '/')) { | ||
864 | printk(KERN_ERR | ||
865 | "EXT3-fs: quotafile must be on " | ||
866 | "filesystem root.\n"); | ||
867 | kfree(sbi->s_qf_names[qtype]); | ||
868 | sbi->s_qf_names[qtype] = NULL; | ||
869 | return 0; | ||
870 | } | ||
871 | break; | ||
872 | case Opt_offusrjquota: | ||
873 | qtype = USRQUOTA; | ||
874 | goto clear_qf_name; | ||
875 | case Opt_offgrpjquota: | ||
876 | qtype = GRPQUOTA; | ||
877 | clear_qf_name: | ||
878 | if (sb_any_quota_enabled(sb)) { | ||
879 | printk(KERN_ERR "EXT3-fs: Cannot change " | ||
880 | "journalled quota options when " | ||
881 | "quota turned on.\n"); | ||
882 | return 0; | ||
883 | } | ||
884 | kfree(sbi->s_qf_names[qtype]); | ||
885 | sbi->s_qf_names[qtype] = NULL; | ||
886 | break; | ||
887 | case Opt_jqfmt_vfsold: | ||
888 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | ||
889 | break; | ||
890 | case Opt_jqfmt_vfsv0: | ||
891 | sbi->s_jquota_fmt = QFMT_VFS_V0; | ||
892 | break; | ||
893 | #else | ||
894 | case Opt_usrjquota: | ||
895 | case Opt_grpjquota: | ||
896 | case Opt_offusrjquota: | ||
897 | case Opt_offgrpjquota: | ||
898 | case Opt_jqfmt_vfsold: | ||
899 | case Opt_jqfmt_vfsv0: | ||
900 | printk(KERN_ERR | ||
901 | "EXT3-fs: journalled quota options not " | ||
902 | "supported.\n"); | ||
903 | break; | ||
904 | #endif | ||
905 | case Opt_abort: | ||
906 | set_opt(sbi->s_mount_opt, ABORT); | ||
907 | break; | ||
908 | case Opt_barrier: | ||
909 | if (match_int(&args[0], &option)) | ||
910 | return 0; | ||
911 | if (option) | ||
912 | set_opt(sbi->s_mount_opt, BARRIER); | ||
913 | else | ||
914 | clear_opt(sbi->s_mount_opt, BARRIER); | ||
915 | break; | ||
916 | case Opt_ignore: | ||
917 | break; | ||
918 | case Opt_resize: | ||
919 | if (!n_blocks_count) { | ||
920 | printk("EXT3-fs: resize option only available " | ||
921 | "for remount\n"); | ||
922 | return 0; | ||
923 | } | ||
924 | match_int(&args[0], &option); | ||
925 | *n_blocks_count = option; | ||
926 | break; | ||
927 | case Opt_nobh: | ||
928 | set_opt(sbi->s_mount_opt, NOBH); | ||
929 | break; | ||
930 | default: | ||
931 | printk (KERN_ERR | ||
932 | "EXT3-fs: Unrecognized mount option \"%s\" " | ||
933 | "or missing value\n", p); | ||
934 | return 0; | ||
935 | } | ||
936 | } | ||
937 | #ifdef CONFIG_QUOTA | ||
938 | if (!sbi->s_jquota_fmt && (sbi->s_qf_names[USRQUOTA] || | ||
939 | sbi->s_qf_names[GRPQUOTA])) { | ||
940 | printk(KERN_ERR | ||
941 | "EXT3-fs: journalled quota format not specified.\n"); | ||
942 | return 0; | ||
943 | } | ||
944 | #endif | ||
945 | |||
946 | return 1; | ||
947 | } | ||
948 | |||
949 | static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, | ||
950 | int read_only) | ||
951 | { | ||
952 | struct ext3_sb_info *sbi = EXT3_SB(sb); | ||
953 | int res = 0; | ||
954 | |||
955 | if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { | ||
956 | printk (KERN_ERR "EXT3-fs warning: revision level too high, " | ||
957 | "forcing read-only mode\n"); | ||
958 | res = MS_RDONLY; | ||
959 | } | ||
960 | if (read_only) | ||
961 | return res; | ||
962 | if (!(sbi->s_mount_state & EXT3_VALID_FS)) | ||
963 | printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, " | ||
964 | "running e2fsck is recommended\n"); | ||
965 | else if ((sbi->s_mount_state & EXT3_ERROR_FS)) | ||
966 | printk (KERN_WARNING | ||
967 | "EXT3-fs warning: mounting fs with errors, " | ||
968 | "running e2fsck is recommended\n"); | ||
969 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | ||
970 | le16_to_cpu(es->s_mnt_count) >= | ||
971 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | ||
972 | printk (KERN_WARNING | ||
973 | "EXT3-fs warning: maximal mount count reached, " | ||
974 | "running e2fsck is recommended\n"); | ||
975 | else if (le32_to_cpu(es->s_checkinterval) && | ||
976 | (le32_to_cpu(es->s_lastcheck) + | ||
977 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | ||
978 | printk (KERN_WARNING | ||
979 | "EXT3-fs warning: checktime reached, " | ||
980 | "running e2fsck is recommended\n"); | ||
981 | #if 0 | ||
982 | /* @@@ We _will_ want to clear the valid bit if we find | ||
983 | inconsistencies, to force a fsck at reboot. But for | ||
984 | a plain journaled filesystem we can keep it set as | ||
985 | valid forever! :) */ | ||
986 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS); | ||
987 | #endif | ||
988 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | ||
989 | es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); | ||
990 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); | ||
991 | es->s_mtime = cpu_to_le32(get_seconds()); | ||
992 | ext3_update_dynamic_rev(sb); | ||
993 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | ||
994 | |||
995 | ext3_commit_super(sb, es, 1); | ||
996 | if (test_opt(sb, DEBUG)) | ||
997 | printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, " | ||
998 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", | ||
999 | sb->s_blocksize, | ||
1000 | sbi->s_groups_count, | ||
1001 | EXT3_BLOCKS_PER_GROUP(sb), | ||
1002 | EXT3_INODES_PER_GROUP(sb), | ||
1003 | sbi->s_mount_opt); | ||
1004 | |||
1005 | printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id); | ||
1006 | if (EXT3_SB(sb)->s_journal->j_inode == NULL) { | ||
1007 | char b[BDEVNAME_SIZE]; | ||
1008 | |||
1009 | printk("external journal on %s\n", | ||
1010 | bdevname(EXT3_SB(sb)->s_journal->j_dev, b)); | ||
1011 | } else { | ||
1012 | printk("internal journal\n"); | ||
1013 | } | ||
1014 | #ifdef CONFIG_EXT3_CHECK | ||
1015 | if (test_opt (sb, CHECK)) { | ||
1016 | ext3_check_blocks_bitmap (sb); | ||
1017 | ext3_check_inodes_bitmap (sb); | ||
1018 | } | ||
1019 | #endif | ||
1020 | return res; | ||
1021 | } | ||
1022 | |||
1023 | /* Called at mount-time, super-block is locked */ | ||
1024 | static int ext3_check_descriptors (struct super_block * sb) | ||
1025 | { | ||
1026 | struct ext3_sb_info *sbi = EXT3_SB(sb); | ||
1027 | unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); | ||
1028 | struct ext3_group_desc * gdp = NULL; | ||
1029 | int desc_block = 0; | ||
1030 | int i; | ||
1031 | |||
1032 | ext3_debug ("Checking group descriptors"); | ||
1033 | |||
1034 | for (i = 0; i < sbi->s_groups_count; i++) | ||
1035 | { | ||
1036 | if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0) | ||
1037 | gdp = (struct ext3_group_desc *) | ||
1038 | sbi->s_group_desc[desc_block++]->b_data; | ||
1039 | if (le32_to_cpu(gdp->bg_block_bitmap) < block || | ||
1040 | le32_to_cpu(gdp->bg_block_bitmap) >= | ||
1041 | block + EXT3_BLOCKS_PER_GROUP(sb)) | ||
1042 | { | ||
1043 | ext3_error (sb, "ext3_check_descriptors", | ||
1044 | "Block bitmap for group %d" | ||
1045 | " not in group (block %lu)!", | ||
1046 | i, (unsigned long) | ||
1047 | le32_to_cpu(gdp->bg_block_bitmap)); | ||
1048 | return 0; | ||
1049 | } | ||
1050 | if (le32_to_cpu(gdp->bg_inode_bitmap) < block || | ||
1051 | le32_to_cpu(gdp->bg_inode_bitmap) >= | ||
1052 | block + EXT3_BLOCKS_PER_GROUP(sb)) | ||
1053 | { | ||
1054 | ext3_error (sb, "ext3_check_descriptors", | ||
1055 | "Inode bitmap for group %d" | ||
1056 | " not in group (block %lu)!", | ||
1057 | i, (unsigned long) | ||
1058 | le32_to_cpu(gdp->bg_inode_bitmap)); | ||
1059 | return 0; | ||
1060 | } | ||
1061 | if (le32_to_cpu(gdp->bg_inode_table) < block || | ||
1062 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= | ||
1063 | block + EXT3_BLOCKS_PER_GROUP(sb)) | ||
1064 | { | ||
1065 | ext3_error (sb, "ext3_check_descriptors", | ||
1066 | "Inode table for group %d" | ||
1067 | " not in group (block %lu)!", | ||
1068 | i, (unsigned long) | ||
1069 | le32_to_cpu(gdp->bg_inode_table)); | ||
1070 | return 0; | ||
1071 | } | ||
1072 | block += EXT3_BLOCKS_PER_GROUP(sb); | ||
1073 | gdp++; | ||
1074 | } | ||
1075 | |||
1076 | sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); | ||
1077 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb)); | ||
1078 | return 1; | ||
1079 | } | ||
1080 | |||
1081 | |||
1082 | /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at | ||
1083 | * the superblock) which were deleted from all directories, but held open by | ||
1084 | * a process at the time of a crash. We walk the list and try to delete these | ||
1085 | * inodes at recovery time (only with a read-write filesystem). | ||
1086 | * | ||
1087 | * In order to keep the orphan inode chain consistent during traversal (in | ||
1088 | * case of crash during recovery), we link each inode into the superblock | ||
1089 | * orphan list_head and handle it the same way as an inode deletion during | ||
1090 | * normal operation (which journals the operations for us). | ||
1091 | * | ||
1092 | * We only do an iget() and an iput() on each inode, which is very safe if we | ||
1093 | * accidentally point at an in-use or already deleted inode. The worst that | ||
1094 | * can happen in this case is that we get a "bit already cleared" message from | ||
1095 | * ext3_free_inode(). The only reason we would point at a wrong inode is if | ||
1096 | * e2fsck was run on this filesystem, and it must have already done the orphan | ||
1097 | * inode cleanup for us, so we can safely abort without any further action. | ||
1098 | */ | ||
1099 | static void ext3_orphan_cleanup (struct super_block * sb, | ||
1100 | struct ext3_super_block * es) | ||
1101 | { | ||
1102 | unsigned int s_flags = sb->s_flags; | ||
1103 | int nr_orphans = 0, nr_truncates = 0; | ||
1104 | #ifdef CONFIG_QUOTA | ||
1105 | int i; | ||
1106 | #endif | ||
1107 | if (!es->s_last_orphan) { | ||
1108 | jbd_debug(4, "no orphan inodes to clean up\n"); | ||
1109 | return; | ||
1110 | } | ||
1111 | |||
1112 | if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) { | ||
1113 | if (es->s_last_orphan) | ||
1114 | jbd_debug(1, "Errors on filesystem, " | ||
1115 | "clearing orphan list.\n"); | ||
1116 | es->s_last_orphan = 0; | ||
1117 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | ||
1118 | return; | ||
1119 | } | ||
1120 | |||
1121 | if (s_flags & MS_RDONLY) { | ||
1122 | printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n", | ||
1123 | sb->s_id); | ||
1124 | sb->s_flags &= ~MS_RDONLY; | ||
1125 | } | ||
1126 | #ifdef CONFIG_QUOTA | ||
1127 | /* Needed for iput() to work correctly and not trash data */ | ||
1128 | sb->s_flags |= MS_ACTIVE; | ||
1129 | /* Turn on quotas so that they are updated correctly */ | ||
1130 | for (i = 0; i < MAXQUOTAS; i++) { | ||
1131 | if (EXT3_SB(sb)->s_qf_names[i]) { | ||
1132 | int ret = ext3_quota_on_mount(sb, i); | ||
1133 | if (ret < 0) | ||
1134 | printk(KERN_ERR | ||
1135 | "EXT3-fs: Cannot turn on journalled " | ||
1136 | "quota: error %d\n", ret); | ||
1137 | } | ||
1138 | } | ||
1139 | #endif | ||
1140 | |||
1141 | while (es->s_last_orphan) { | ||
1142 | struct inode *inode; | ||
1143 | |||
1144 | if (!(inode = | ||
1145 | ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { | ||
1146 | es->s_last_orphan = 0; | ||
1147 | break; | ||
1148 | } | ||
1149 | |||
1150 | list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); | ||
1151 | DQUOT_INIT(inode); | ||
1152 | if (inode->i_nlink) { | ||
1153 | printk(KERN_DEBUG | ||
1154 | "%s: truncating inode %ld to %Ld bytes\n", | ||
1155 | __FUNCTION__, inode->i_ino, inode->i_size); | ||
1156 | jbd_debug(2, "truncating inode %ld to %Ld bytes\n", | ||
1157 | inode->i_ino, inode->i_size); | ||
1158 | ext3_truncate(inode); | ||
1159 | nr_truncates++; | ||
1160 | } else { | ||
1161 | printk(KERN_DEBUG | ||
1162 | "%s: deleting unreferenced inode %ld\n", | ||
1163 | __FUNCTION__, inode->i_ino); | ||
1164 | jbd_debug(2, "deleting unreferenced inode %ld\n", | ||
1165 | inode->i_ino); | ||
1166 | nr_orphans++; | ||
1167 | } | ||
1168 | iput(inode); /* The delete magic happens here! */ | ||
1169 | } | ||
1170 | |||
1171 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | ||
1172 | |||
1173 | if (nr_orphans) | ||
1174 | printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n", | ||
1175 | sb->s_id, PLURAL(nr_orphans)); | ||
1176 | if (nr_truncates) | ||
1177 | printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n", | ||
1178 | sb->s_id, PLURAL(nr_truncates)); | ||
1179 | #ifdef CONFIG_QUOTA | ||
1180 | /* Turn quotas off */ | ||
1181 | for (i = 0; i < MAXQUOTAS; i++) { | ||
1182 | if (sb_dqopt(sb)->files[i]) | ||
1183 | vfs_quota_off(sb, i); | ||
1184 | } | ||
1185 | #endif | ||
1186 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | ||
1187 | } | ||
1188 | |||
1189 | #define log2(n) ffz(~(n)) | ||
1190 | |||
1191 | /* | ||
1192 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | ||
1193 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | ||
1194 | * We need to be 1 filesystem block less than the 2^32 sector limit. | ||
1195 | */ | ||
1196 | static loff_t ext3_max_size(int bits) | ||
1197 | { | ||
1198 | loff_t res = EXT3_NDIR_BLOCKS; | ||
1199 | /* This constant is calculated to be the largest file size for a | ||
1200 | * dense, 4k-blocksize file such that the total number of | ||
1201 | * sectors in the file, including data and all indirect blocks, | ||
1202 | * does not exceed 2^32. */ | ||
1203 | const loff_t upper_limit = 0x1ff7fffd000LL; | ||
1204 | |||
1205 | res += 1LL << (bits-2); | ||
1206 | res += 1LL << (2*(bits-2)); | ||
1207 | res += 1LL << (3*(bits-2)); | ||
1208 | res <<= bits; | ||
1209 | if (res > upper_limit) | ||
1210 | res = upper_limit; | ||
1211 | return res; | ||
1212 | } | ||
1213 | |||
1214 | static unsigned long descriptor_loc(struct super_block *sb, | ||
1215 | unsigned long logic_sb_block, | ||
1216 | int nr) | ||
1217 | { | ||
1218 | struct ext3_sb_info *sbi = EXT3_SB(sb); | ||
1219 | unsigned long bg, first_data_block, first_meta_bg; | ||
1220 | int has_super = 0; | ||
1221 | |||
1222 | first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); | ||
1223 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | ||
1224 | |||
1225 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || | ||
1226 | nr < first_meta_bg) | ||
1227 | return (logic_sb_block + nr + 1); | ||
1228 | bg = sbi->s_desc_per_block * nr; | ||
1229 | if (ext3_bg_has_super(sb, bg)) | ||
1230 | has_super = 1; | ||
1231 | return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); | ||
1232 | } | ||
1233 | |||
1234 | |||
1235 | static int ext3_fill_super (struct super_block *sb, void *data, int silent) | ||
1236 | { | ||
1237 | struct buffer_head * bh; | ||
1238 | struct ext3_super_block *es = NULL; | ||
1239 | struct ext3_sb_info *sbi; | ||
1240 | unsigned long block; | ||
1241 | unsigned long sb_block = get_sb_block(&data); | ||
1242 | unsigned long logic_sb_block; | ||
1243 | unsigned long offset = 0; | ||
1244 | unsigned long journal_inum = 0; | ||
1245 | unsigned long def_mount_opts; | ||
1246 | struct inode *root; | ||
1247 | int blocksize; | ||
1248 | int hblock; | ||
1249 | int db_count; | ||
1250 | int i; | ||
1251 | int needs_recovery; | ||
1252 | __le32 features; | ||
1253 | |||
1254 | sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); | ||
1255 | if (!sbi) | ||
1256 | return -ENOMEM; | ||
1257 | sb->s_fs_info = sbi; | ||
1258 | memset(sbi, 0, sizeof(*sbi)); | ||
1259 | sbi->s_mount_opt = 0; | ||
1260 | sbi->s_resuid = EXT3_DEF_RESUID; | ||
1261 | sbi->s_resgid = EXT3_DEF_RESGID; | ||
1262 | |||
1263 | unlock_kernel(); | ||
1264 | |||
1265 | blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); | ||
1266 | if (!blocksize) { | ||
1267 | printk(KERN_ERR "EXT3-fs: unable to set blocksize\n"); | ||
1268 | goto out_fail; | ||
1269 | } | ||
1270 | |||
1271 | /* | ||
1272 | * The ext3 superblock will not be buffer aligned for other than 1kB | ||
1273 | * block sizes. We need to calculate the offset from buffer start. | ||
1274 | */ | ||
1275 | if (blocksize != EXT3_MIN_BLOCK_SIZE) { | ||
1276 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; | ||
1277 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; | ||
1278 | } else { | ||
1279 | logic_sb_block = sb_block; | ||
1280 | } | ||
1281 | |||
1282 | if (!(bh = sb_bread(sb, logic_sb_block))) { | ||
1283 | printk (KERN_ERR "EXT3-fs: unable to read superblock\n"); | ||
1284 | goto out_fail; | ||
1285 | } | ||
1286 | /* | ||
1287 | * Note: s_es must be initialized as soon as possible because | ||
1288 | * some ext3 macro-instructions depend on its value | ||
1289 | */ | ||
1290 | es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); | ||
1291 | sbi->s_es = es; | ||
1292 | sb->s_magic = le16_to_cpu(es->s_magic); | ||
1293 | if (sb->s_magic != EXT3_SUPER_MAGIC) | ||
1294 | goto cantfind_ext3; | ||
1295 | |||
1296 | /* Set defaults before we parse the mount options */ | ||
1297 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | ||
1298 | if (def_mount_opts & EXT3_DEFM_DEBUG) | ||
1299 | set_opt(sbi->s_mount_opt, DEBUG); | ||
1300 | if (def_mount_opts & EXT3_DEFM_BSDGROUPS) | ||
1301 | set_opt(sbi->s_mount_opt, GRPID); | ||
1302 | if (def_mount_opts & EXT3_DEFM_UID16) | ||
1303 | set_opt(sbi->s_mount_opt, NO_UID32); | ||
1304 | if (def_mount_opts & EXT3_DEFM_XATTR_USER) | ||
1305 | set_opt(sbi->s_mount_opt, XATTR_USER); | ||
1306 | if (def_mount_opts & EXT3_DEFM_ACL) | ||
1307 | set_opt(sbi->s_mount_opt, POSIX_ACL); | ||
1308 | if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) | ||
1309 | sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA; | ||
1310 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) | ||
1311 | sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA; | ||
1312 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) | ||
1313 | sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA; | ||
1314 | |||
1315 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) | ||
1316 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | ||
1317 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO) | ||
1318 | set_opt(sbi->s_mount_opt, ERRORS_RO); | ||
1319 | |||
1320 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | ||
1321 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | ||
1322 | |||
1323 | set_opt(sbi->s_mount_opt, RESERVATION); | ||
1324 | |||
1325 | if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0)) | ||
1326 | goto failed_mount; | ||
1327 | |||
1328 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | ||
1329 | ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | ||
1330 | |||
1331 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && | ||
1332 | (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || | ||
1333 | EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | ||
1334 | EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) | ||
1335 | printk(KERN_WARNING | ||
1336 | "EXT3-fs warning: feature flags set on rev 0 fs, " | ||
1337 | "running e2fsck is recommended\n"); | ||
1338 | /* | ||
1339 | * Check feature flags regardless of the revision level, since we | ||
1340 | * previously didn't change the revision level when setting the flags, | ||
1341 | * so there is a chance incompat flags are set on a rev 0 filesystem. | ||
1342 | */ | ||
1343 | features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP); | ||
1344 | if (features) { | ||
1345 | printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of " | ||
1346 | "unsupported optional features (%x).\n", | ||
1347 | sb->s_id, le32_to_cpu(features)); | ||
1348 | goto failed_mount; | ||
1349 | } | ||
1350 | features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP); | ||
1351 | if (!(sb->s_flags & MS_RDONLY) && features) { | ||
1352 | printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of " | ||
1353 | "unsupported optional features (%x).\n", | ||
1354 | sb->s_id, le32_to_cpu(features)); | ||
1355 | goto failed_mount; | ||
1356 | } | ||
1357 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | ||
1358 | |||
1359 | if (blocksize < EXT3_MIN_BLOCK_SIZE || | ||
1360 | blocksize > EXT3_MAX_BLOCK_SIZE) { | ||
1361 | printk(KERN_ERR | ||
1362 | "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n", | ||
1363 | blocksize, sb->s_id); | ||
1364 | goto failed_mount; | ||
1365 | } | ||
1366 | |||
1367 | hblock = bdev_hardsect_size(sb->s_bdev); | ||
1368 | if (sb->s_blocksize != blocksize) { | ||
1369 | /* | ||
1370 | * Make sure the blocksize for the filesystem is larger | ||
1371 | * than the hardware sectorsize for the machine. | ||
1372 | */ | ||
1373 | if (blocksize < hblock) { | ||
1374 | printk(KERN_ERR "EXT3-fs: blocksize %d too small for " | ||
1375 | "device blocksize %d.\n", blocksize, hblock); | ||
1376 | goto failed_mount; | ||
1377 | } | ||
1378 | |||
1379 | brelse (bh); | ||
1380 | sb_set_blocksize(sb, blocksize); | ||
1381 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; | ||
1382 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; | ||
1383 | bh = sb_bread(sb, logic_sb_block); | ||
1384 | if (!bh) { | ||
1385 | printk(KERN_ERR | ||
1386 | "EXT3-fs: Can't read superblock on 2nd try.\n"); | ||
1387 | goto failed_mount; | ||
1388 | } | ||
1389 | es = (struct ext3_super_block *)(((char *)bh->b_data) + offset); | ||
1390 | sbi->s_es = es; | ||
1391 | if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) { | ||
1392 | printk (KERN_ERR | ||
1393 | "EXT3-fs: Magic mismatch, very weird !\n"); | ||
1394 | goto failed_mount; | ||
1395 | } | ||
1396 | } | ||
1397 | |||
1398 | sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); | ||
1399 | |||
1400 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { | ||
1401 | sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; | ||
1402 | sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO; | ||
1403 | } else { | ||
1404 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | ||
1405 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | ||
1406 | if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) || | ||
1407 | (sbi->s_inode_size & (sbi->s_inode_size - 1)) || | ||
1408 | (sbi->s_inode_size > blocksize)) { | ||
1409 | printk (KERN_ERR | ||
1410 | "EXT3-fs: unsupported inode size: %d\n", | ||
1411 | sbi->s_inode_size); | ||
1412 | goto failed_mount; | ||
1413 | } | ||
1414 | } | ||
1415 | sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << | ||
1416 | le32_to_cpu(es->s_log_frag_size); | ||
1417 | if (blocksize != sbi->s_frag_size) { | ||
1418 | printk(KERN_ERR | ||
1419 | "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n", | ||
1420 | sbi->s_frag_size, blocksize); | ||
1421 | goto failed_mount; | ||
1422 | } | ||
1423 | sbi->s_frags_per_block = 1; | ||
1424 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | ||
1425 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | ||
1426 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | ||
1427 | if (EXT3_INODE_SIZE(sb) == 0) | ||
1428 | goto cantfind_ext3; | ||
1429 | sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); | ||
1430 | if (sbi->s_inodes_per_block == 0) | ||
1431 | goto cantfind_ext3; | ||
1432 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | ||
1433 | sbi->s_inodes_per_block; | ||
1434 | sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); | ||
1435 | sbi->s_sbh = bh; | ||
1436 | sbi->s_mount_state = le16_to_cpu(es->s_state); | ||
1437 | sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb)); | ||
1438 | sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb)); | ||
1439 | for (i=0; i < 4; i++) | ||
1440 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | ||
1441 | sbi->s_def_hash_version = es->s_def_hash_version; | ||
1442 | |||
1443 | if (sbi->s_blocks_per_group > blocksize * 8) { | ||
1444 | printk (KERN_ERR | ||
1445 | "EXT3-fs: #blocks per group too big: %lu\n", | ||
1446 | sbi->s_blocks_per_group); | ||
1447 | goto failed_mount; | ||
1448 | } | ||
1449 | if (sbi->s_frags_per_group > blocksize * 8) { | ||
1450 | printk (KERN_ERR | ||
1451 | "EXT3-fs: #fragments per group too big: %lu\n", | ||
1452 | sbi->s_frags_per_group); | ||
1453 | goto failed_mount; | ||
1454 | } | ||
1455 | if (sbi->s_inodes_per_group > blocksize * 8) { | ||
1456 | printk (KERN_ERR | ||
1457 | "EXT3-fs: #inodes per group too big: %lu\n", | ||
1458 | sbi->s_inodes_per_group); | ||
1459 | goto failed_mount; | ||
1460 | } | ||
1461 | |||
1462 | if (EXT3_BLOCKS_PER_GROUP(sb) == 0) | ||
1463 | goto cantfind_ext3; | ||
1464 | sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - | ||
1465 | le32_to_cpu(es->s_first_data_block) + | ||
1466 | EXT3_BLOCKS_PER_GROUP(sb) - 1) / | ||
1467 | EXT3_BLOCKS_PER_GROUP(sb); | ||
1468 | db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) / | ||
1469 | EXT3_DESC_PER_BLOCK(sb); | ||
1470 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), | ||
1471 | GFP_KERNEL); | ||
1472 | if (sbi->s_group_desc == NULL) { | ||
1473 | printk (KERN_ERR "EXT3-fs: not enough memory\n"); | ||
1474 | goto failed_mount; | ||
1475 | } | ||
1476 | |||
1477 | percpu_counter_init(&sbi->s_freeblocks_counter); | ||
1478 | percpu_counter_init(&sbi->s_freeinodes_counter); | ||
1479 | percpu_counter_init(&sbi->s_dirs_counter); | ||
1480 | bgl_lock_init(&sbi->s_blockgroup_lock); | ||
1481 | |||
1482 | for (i = 0; i < db_count; i++) { | ||
1483 | block = descriptor_loc(sb, logic_sb_block, i); | ||
1484 | sbi->s_group_desc[i] = sb_bread(sb, block); | ||
1485 | if (!sbi->s_group_desc[i]) { | ||
1486 | printk (KERN_ERR "EXT3-fs: " | ||
1487 | "can't read group descriptor %d\n", i); | ||
1488 | db_count = i; | ||
1489 | goto failed_mount2; | ||
1490 | } | ||
1491 | } | ||
1492 | if (!ext3_check_descriptors (sb)) { | ||
1493 | printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n"); | ||
1494 | goto failed_mount2; | ||
1495 | } | ||
1496 | sbi->s_gdb_count = db_count; | ||
1497 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | ||
1498 | spin_lock_init(&sbi->s_next_gen_lock); | ||
1499 | /* per fileystem reservation list head & lock */ | ||
1500 | spin_lock_init(&sbi->s_rsv_window_lock); | ||
1501 | sbi->s_rsv_window_root = RB_ROOT; | ||
1502 | /* Add a single, static dummy reservation to the start of the | ||
1503 | * reservation window list --- it gives us a placeholder for | ||
1504 | * append-at-start-of-list which makes the allocation logic | ||
1505 | * _much_ simpler. */ | ||
1506 | sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; | ||
1507 | sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; | ||
1508 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | ||
1509 | sbi->s_rsv_window_head.rsv_goal_size = 0; | ||
1510 | ext3_rsv_window_add(sb, &sbi->s_rsv_window_head); | ||
1511 | |||
1512 | /* | ||
1513 | * set up enough so that it can read an inode | ||
1514 | */ | ||
1515 | sb->s_op = &ext3_sops; | ||
1516 | sb->s_export_op = &ext3_export_ops; | ||
1517 | sb->s_xattr = ext3_xattr_handlers; | ||
1518 | #ifdef CONFIG_QUOTA | ||
1519 | sb->s_qcop = &ext3_qctl_operations; | ||
1520 | sb->dq_op = &ext3_quota_operations; | ||
1521 | #endif | ||
1522 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | ||
1523 | |||
1524 | sb->s_root = NULL; | ||
1525 | |||
1526 | needs_recovery = (es->s_last_orphan != 0 || | ||
1527 | EXT3_HAS_INCOMPAT_FEATURE(sb, | ||
1528 | EXT3_FEATURE_INCOMPAT_RECOVER)); | ||
1529 | |||
1530 | /* | ||
1531 | * The first inode we look at is the journal inode. Don't try | ||
1532 | * root first: it may be modified in the journal! | ||
1533 | */ | ||
1534 | if (!test_opt(sb, NOLOAD) && | ||
1535 | EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { | ||
1536 | if (ext3_load_journal(sb, es)) | ||
1537 | goto failed_mount2; | ||
1538 | } else if (journal_inum) { | ||
1539 | if (ext3_create_journal(sb, es, journal_inum)) | ||
1540 | goto failed_mount2; | ||
1541 | } else { | ||
1542 | if (!silent) | ||
1543 | printk (KERN_ERR | ||
1544 | "ext3: No journal on filesystem on %s\n", | ||
1545 | sb->s_id); | ||
1546 | goto failed_mount2; | ||
1547 | } | ||
1548 | |||
1549 | /* We have now updated the journal if required, so we can | ||
1550 | * validate the data journaling mode. */ | ||
1551 | switch (test_opt(sb, DATA_FLAGS)) { | ||
1552 | case 0: | ||
1553 | /* No mode set, assume a default based on the journal | ||
1554 | capabilities: ORDERED_DATA if the journal can | ||
1555 | cope, else JOURNAL_DATA */ | ||
1556 | if (journal_check_available_features | ||
1557 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) | ||
1558 | set_opt(sbi->s_mount_opt, ORDERED_DATA); | ||
1559 | else | ||
1560 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | ||
1561 | break; | ||
1562 | |||
1563 | case EXT3_MOUNT_ORDERED_DATA: | ||
1564 | case EXT3_MOUNT_WRITEBACK_DATA: | ||
1565 | if (!journal_check_available_features | ||
1566 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { | ||
1567 | printk(KERN_ERR "EXT3-fs: Journal does not support " | ||
1568 | "requested data journaling mode\n"); | ||
1569 | goto failed_mount3; | ||
1570 | } | ||
1571 | default: | ||
1572 | break; | ||
1573 | } | ||
1574 | |||
1575 | if (test_opt(sb, NOBH)) { | ||
1576 | if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) { | ||
1577 | printk(KERN_WARNING "EXT3-fs: Ignoring nobh option " | ||
1578 | "since filesystem blocksize doesn't match " | ||
1579 | "pagesize\n"); | ||
1580 | clear_opt(sbi->s_mount_opt, NOBH); | ||
1581 | } | ||
1582 | if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) { | ||
1583 | printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - " | ||
1584 | "its supported only with writeback mode\n"); | ||
1585 | clear_opt(sbi->s_mount_opt, NOBH); | ||
1586 | } | ||
1587 | } | ||
1588 | /* | ||
1589 | * The journal_load will have done any necessary log recovery, | ||
1590 | * so we can safely mount the rest of the filesystem now. | ||
1591 | */ | ||
1592 | |||
1593 | root = iget(sb, EXT3_ROOT_INO); | ||
1594 | sb->s_root = d_alloc_root(root); | ||
1595 | if (!sb->s_root) { | ||
1596 | printk(KERN_ERR "EXT3-fs: get root inode failed\n"); | ||
1597 | iput(root); | ||
1598 | goto failed_mount3; | ||
1599 | } | ||
1600 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | ||
1601 | dput(sb->s_root); | ||
1602 | sb->s_root = NULL; | ||
1603 | printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n"); | ||
1604 | goto failed_mount3; | ||
1605 | } | ||
1606 | |||
1607 | ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY); | ||
1608 | /* | ||
1609 | * akpm: core read_super() calls in here with the superblock locked. | ||
1610 | * That deadlocks, because orphan cleanup needs to lock the superblock | ||
1611 | * in numerous places. Here we just pop the lock - it's relatively | ||
1612 | * harmless, because we are now ready to accept write_super() requests, | ||
1613 | * and aviro says that's the only reason for hanging onto the | ||
1614 | * superblock lock. | ||
1615 | */ | ||
1616 | EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; | ||
1617 | ext3_orphan_cleanup(sb, es); | ||
1618 | EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; | ||
1619 | if (needs_recovery) | ||
1620 | printk (KERN_INFO "EXT3-fs: recovery complete.\n"); | ||
1621 | ext3_mark_recovery_complete(sb, es); | ||
1622 | printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n", | ||
1623 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": | ||
1624 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": | ||
1625 | "writeback"); | ||
1626 | |||
1627 | percpu_counter_mod(&sbi->s_freeblocks_counter, | ||
1628 | ext3_count_free_blocks(sb)); | ||
1629 | percpu_counter_mod(&sbi->s_freeinodes_counter, | ||
1630 | ext3_count_free_inodes(sb)); | ||
1631 | percpu_counter_mod(&sbi->s_dirs_counter, | ||
1632 | ext3_count_dirs(sb)); | ||
1633 | |||
1634 | lock_kernel(); | ||
1635 | return 0; | ||
1636 | |||
1637 | cantfind_ext3: | ||
1638 | if (!silent) | ||
1639 | printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n", | ||
1640 | sb->s_id); | ||
1641 | goto failed_mount; | ||
1642 | |||
1643 | failed_mount3: | ||
1644 | journal_destroy(sbi->s_journal); | ||
1645 | failed_mount2: | ||
1646 | for (i = 0; i < db_count; i++) | ||
1647 | brelse(sbi->s_group_desc[i]); | ||
1648 | kfree(sbi->s_group_desc); | ||
1649 | failed_mount: | ||
1650 | #ifdef CONFIG_QUOTA | ||
1651 | for (i = 0; i < MAXQUOTAS; i++) | ||
1652 | kfree(sbi->s_qf_names[i]); | ||
1653 | #endif | ||
1654 | ext3_blkdev_remove(sbi); | ||
1655 | brelse(bh); | ||
1656 | out_fail: | ||
1657 | sb->s_fs_info = NULL; | ||
1658 | kfree(sbi); | ||
1659 | lock_kernel(); | ||
1660 | return -EINVAL; | ||
1661 | } | ||
1662 | |||
1663 | /* | ||
1664 | * Setup any per-fs journal parameters now. We'll do this both on | ||
1665 | * initial mount, once the journal has been initialised but before we've | ||
1666 | * done any recovery; and again on any subsequent remount. | ||
1667 | */ | ||
1668 | static void ext3_init_journal_params(struct super_block *sb, journal_t *journal) | ||
1669 | { | ||
1670 | struct ext3_sb_info *sbi = EXT3_SB(sb); | ||
1671 | |||
1672 | if (sbi->s_commit_interval) | ||
1673 | journal->j_commit_interval = sbi->s_commit_interval; | ||
1674 | /* We could also set up an ext3-specific default for the commit | ||
1675 | * interval here, but for now we'll just fall back to the jbd | ||
1676 | * default. */ | ||
1677 | |||
1678 | spin_lock(&journal->j_state_lock); | ||
1679 | if (test_opt(sb, BARRIER)) | ||
1680 | journal->j_flags |= JFS_BARRIER; | ||
1681 | else | ||
1682 | journal->j_flags &= ~JFS_BARRIER; | ||
1683 | spin_unlock(&journal->j_state_lock); | ||
1684 | } | ||
1685 | |||
1686 | static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum) | ||
1687 | { | ||
1688 | struct inode *journal_inode; | ||
1689 | journal_t *journal; | ||
1690 | |||
1691 | /* First, test for the existence of a valid inode on disk. Bad | ||
1692 | * things happen if we iget() an unused inode, as the subsequent | ||
1693 | * iput() will try to delete it. */ | ||
1694 | |||
1695 | journal_inode = iget(sb, journal_inum); | ||
1696 | if (!journal_inode) { | ||
1697 | printk(KERN_ERR "EXT3-fs: no journal found.\n"); | ||
1698 | return NULL; | ||
1699 | } | ||
1700 | if (!journal_inode->i_nlink) { | ||
1701 | make_bad_inode(journal_inode); | ||
1702 | iput(journal_inode); | ||
1703 | printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n"); | ||
1704 | return NULL; | ||
1705 | } | ||
1706 | |||
1707 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | ||
1708 | journal_inode, journal_inode->i_size); | ||
1709 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | ||
1710 | printk(KERN_ERR "EXT3-fs: invalid journal inode.\n"); | ||
1711 | iput(journal_inode); | ||
1712 | return NULL; | ||
1713 | } | ||
1714 | |||
1715 | journal = journal_init_inode(journal_inode); | ||
1716 | if (!journal) { | ||
1717 | printk(KERN_ERR "EXT3-fs: Could not load journal inode\n"); | ||
1718 | iput(journal_inode); | ||
1719 | return NULL; | ||
1720 | } | ||
1721 | journal->j_private = sb; | ||
1722 | ext3_init_journal_params(sb, journal); | ||
1723 | return journal; | ||
1724 | } | ||
1725 | |||
1726 | static journal_t *ext3_get_dev_journal(struct super_block *sb, | ||
1727 | dev_t j_dev) | ||
1728 | { | ||
1729 | struct buffer_head * bh; | ||
1730 | journal_t *journal; | ||
1731 | int start; | ||
1732 | int len; | ||
1733 | int hblock, blocksize; | ||
1734 | unsigned long sb_block; | ||
1735 | unsigned long offset; | ||
1736 | struct ext3_super_block * es; | ||
1737 | struct block_device *bdev; | ||
1738 | |||
1739 | bdev = ext3_blkdev_get(j_dev); | ||
1740 | if (bdev == NULL) | ||
1741 | return NULL; | ||
1742 | |||
1743 | if (bd_claim(bdev, sb)) { | ||
1744 | printk(KERN_ERR | ||
1745 | "EXT3: failed to claim external journal device.\n"); | ||
1746 | blkdev_put(bdev); | ||
1747 | return NULL; | ||
1748 | } | ||
1749 | |||
1750 | blocksize = sb->s_blocksize; | ||
1751 | hblock = bdev_hardsect_size(bdev); | ||
1752 | if (blocksize < hblock) { | ||
1753 | printk(KERN_ERR | ||
1754 | "EXT3-fs: blocksize too small for journal device.\n"); | ||
1755 | goto out_bdev; | ||
1756 | } | ||
1757 | |||
1758 | sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; | ||
1759 | offset = EXT3_MIN_BLOCK_SIZE % blocksize; | ||
1760 | set_blocksize(bdev, blocksize); | ||
1761 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | ||
1762 | printk(KERN_ERR "EXT3-fs: couldn't read superblock of " | ||
1763 | "external journal\n"); | ||
1764 | goto out_bdev; | ||
1765 | } | ||
1766 | |||
1767 | es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); | ||
1768 | if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || | ||
1769 | !(le32_to_cpu(es->s_feature_incompat) & | ||
1770 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { | ||
1771 | printk(KERN_ERR "EXT3-fs: external journal has " | ||
1772 | "bad superblock\n"); | ||
1773 | brelse(bh); | ||
1774 | goto out_bdev; | ||
1775 | } | ||
1776 | |||
1777 | if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { | ||
1778 | printk(KERN_ERR "EXT3-fs: journal UUID does not match\n"); | ||
1779 | brelse(bh); | ||
1780 | goto out_bdev; | ||
1781 | } | ||
1782 | |||
1783 | len = le32_to_cpu(es->s_blocks_count); | ||
1784 | start = sb_block + 1; | ||
1785 | brelse(bh); /* we're done with the superblock */ | ||
1786 | |||
1787 | journal = journal_init_dev(bdev, sb->s_bdev, | ||
1788 | start, len, blocksize); | ||
1789 | if (!journal) { | ||
1790 | printk(KERN_ERR "EXT3-fs: failed to create device journal\n"); | ||
1791 | goto out_bdev; | ||
1792 | } | ||
1793 | journal->j_private = sb; | ||
1794 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | ||
1795 | wait_on_buffer(journal->j_sb_buffer); | ||
1796 | if (!buffer_uptodate(journal->j_sb_buffer)) { | ||
1797 | printk(KERN_ERR "EXT3-fs: I/O error on journal device\n"); | ||
1798 | goto out_journal; | ||
1799 | } | ||
1800 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | ||
1801 | printk(KERN_ERR "EXT3-fs: External journal has more than one " | ||
1802 | "user (unsupported) - %d\n", | ||
1803 | be32_to_cpu(journal->j_superblock->s_nr_users)); | ||
1804 | goto out_journal; | ||
1805 | } | ||
1806 | EXT3_SB(sb)->journal_bdev = bdev; | ||
1807 | ext3_init_journal_params(sb, journal); | ||
1808 | return journal; | ||
1809 | out_journal: | ||
1810 | journal_destroy(journal); | ||
1811 | out_bdev: | ||
1812 | ext3_blkdev_put(bdev); | ||
1813 | return NULL; | ||
1814 | } | ||
1815 | |||
1816 | static int ext3_load_journal(struct super_block * sb, | ||
1817 | struct ext3_super_block * es) | ||
1818 | { | ||
1819 | journal_t *journal; | ||
1820 | int journal_inum = le32_to_cpu(es->s_journal_inum); | ||
1821 | dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | ||
1822 | int err = 0; | ||
1823 | int really_read_only; | ||
1824 | |||
1825 | really_read_only = bdev_read_only(sb->s_bdev); | ||
1826 | |||
1827 | /* | ||
1828 | * Are we loading a blank journal or performing recovery after a | ||
1829 | * crash? For recovery, we need to check in advance whether we | ||
1830 | * can get read-write access to the device. | ||
1831 | */ | ||
1832 | |||
1833 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { | ||
1834 | if (sb->s_flags & MS_RDONLY) { | ||
1835 | printk(KERN_INFO "EXT3-fs: INFO: recovery " | ||
1836 | "required on readonly filesystem.\n"); | ||
1837 | if (really_read_only) { | ||
1838 | printk(KERN_ERR "EXT3-fs: write access " | ||
1839 | "unavailable, cannot proceed.\n"); | ||
1840 | return -EROFS; | ||
1841 | } | ||
1842 | printk (KERN_INFO "EXT3-fs: write access will " | ||
1843 | "be enabled during recovery.\n"); | ||
1844 | } | ||
1845 | } | ||
1846 | |||
1847 | if (journal_inum && journal_dev) { | ||
1848 | printk(KERN_ERR "EXT3-fs: filesystem has both journal " | ||
1849 | "and inode journals!\n"); | ||
1850 | return -EINVAL; | ||
1851 | } | ||
1852 | |||
1853 | if (journal_inum) { | ||
1854 | if (!(journal = ext3_get_journal(sb, journal_inum))) | ||
1855 | return -EINVAL; | ||
1856 | } else { | ||
1857 | if (!(journal = ext3_get_dev_journal(sb, journal_dev))) | ||
1858 | return -EINVAL; | ||
1859 | } | ||
1860 | |||
1861 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | ||
1862 | err = journal_update_format(journal); | ||
1863 | if (err) { | ||
1864 | printk(KERN_ERR "EXT3-fs: error updating journal.\n"); | ||
1865 | journal_destroy(journal); | ||
1866 | return err; | ||
1867 | } | ||
1868 | } | ||
1869 | |||
1870 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) | ||
1871 | err = journal_wipe(journal, !really_read_only); | ||
1872 | if (!err) | ||
1873 | err = journal_load(journal); | ||
1874 | |||
1875 | if (err) { | ||
1876 | printk(KERN_ERR "EXT3-fs: error loading journal.\n"); | ||
1877 | journal_destroy(journal); | ||
1878 | return err; | ||
1879 | } | ||
1880 | |||
1881 | EXT3_SB(sb)->s_journal = journal; | ||
1882 | ext3_clear_journal_err(sb, es); | ||
1883 | return 0; | ||
1884 | } | ||
1885 | |||
1886 | static int ext3_create_journal(struct super_block * sb, | ||
1887 | struct ext3_super_block * es, | ||
1888 | int journal_inum) | ||
1889 | { | ||
1890 | journal_t *journal; | ||
1891 | |||
1892 | if (sb->s_flags & MS_RDONLY) { | ||
1893 | printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to " | ||
1894 | "create journal.\n"); | ||
1895 | return -EROFS; | ||
1896 | } | ||
1897 | |||
1898 | if (!(journal = ext3_get_journal(sb, journal_inum))) | ||
1899 | return -EINVAL; | ||
1900 | |||
1901 | printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n", | ||
1902 | journal_inum); | ||
1903 | |||
1904 | if (journal_create(journal)) { | ||
1905 | printk(KERN_ERR "EXT3-fs: error creating journal.\n"); | ||
1906 | journal_destroy(journal); | ||
1907 | return -EIO; | ||
1908 | } | ||
1909 | |||
1910 | EXT3_SB(sb)->s_journal = journal; | ||
1911 | |||
1912 | ext3_update_dynamic_rev(sb); | ||
1913 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | ||
1914 | EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); | ||
1915 | |||
1916 | es->s_journal_inum = cpu_to_le32(journal_inum); | ||
1917 | sb->s_dirt = 1; | ||
1918 | |||
1919 | /* Make sure we flush the recovery flag to disk. */ | ||
1920 | ext3_commit_super(sb, es, 1); | ||
1921 | |||
1922 | return 0; | ||
1923 | } | ||
1924 | |||
1925 | static void ext3_commit_super (struct super_block * sb, | ||
1926 | struct ext3_super_block * es, | ||
1927 | int sync) | ||
1928 | { | ||
1929 | struct buffer_head *sbh = EXT3_SB(sb)->s_sbh; | ||
1930 | |||
1931 | if (!sbh) | ||
1932 | return; | ||
1933 | es->s_wtime = cpu_to_le32(get_seconds()); | ||
1934 | es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); | ||
1935 | es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); | ||
1936 | BUFFER_TRACE(sbh, "marking dirty"); | ||
1937 | mark_buffer_dirty(sbh); | ||
1938 | if (sync) | ||
1939 | sync_dirty_buffer(sbh); | ||
1940 | } | ||
1941 | |||
1942 | |||
1943 | /* | ||
1944 | * Have we just finished recovery? If so, and if we are mounting (or | ||
1945 | * remounting) the filesystem readonly, then we will end up with a | ||
1946 | * consistent fs on disk. Record that fact. | ||
1947 | */ | ||
1948 | static void ext3_mark_recovery_complete(struct super_block * sb, | ||
1949 | struct ext3_super_block * es) | ||
1950 | { | ||
1951 | journal_t *journal = EXT3_SB(sb)->s_journal; | ||
1952 | |||
1953 | journal_lock_updates(journal); | ||
1954 | journal_flush(journal); | ||
1955 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && | ||
1956 | sb->s_flags & MS_RDONLY) { | ||
1957 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | ||
1958 | sb->s_dirt = 0; | ||
1959 | ext3_commit_super(sb, es, 1); | ||
1960 | } | ||
1961 | journal_unlock_updates(journal); | ||
1962 | } | ||
1963 | |||
1964 | /* | ||
1965 | * If we are mounting (or read-write remounting) a filesystem whose journal | ||
1966 | * has recorded an error from a previous lifetime, move that error to the | ||
1967 | * main filesystem now. | ||
1968 | */ | ||
1969 | static void ext3_clear_journal_err(struct super_block * sb, | ||
1970 | struct ext3_super_block * es) | ||
1971 | { | ||
1972 | journal_t *journal; | ||
1973 | int j_errno; | ||
1974 | const char *errstr; | ||
1975 | |||
1976 | journal = EXT3_SB(sb)->s_journal; | ||
1977 | |||
1978 | /* | ||
1979 | * Now check for any error status which may have been recorded in the | ||
1980 | * journal by a prior ext3_error() or ext3_abort() | ||
1981 | */ | ||
1982 | |||
1983 | j_errno = journal_errno(journal); | ||
1984 | if (j_errno) { | ||
1985 | char nbuf[16]; | ||
1986 | |||
1987 | errstr = ext3_decode_error(sb, j_errno, nbuf); | ||
1988 | ext3_warning(sb, __FUNCTION__, "Filesystem error recorded " | ||
1989 | "from previous mount: %s", errstr); | ||
1990 | ext3_warning(sb, __FUNCTION__, "Marking fs in need of " | ||
1991 | "filesystem check."); | ||
1992 | |||
1993 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | ||
1994 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); | ||
1995 | ext3_commit_super (sb, es, 1); | ||
1996 | |||
1997 | journal_clear_err(journal); | ||
1998 | } | ||
1999 | } | ||
2000 | |||
2001 | /* | ||
2002 | * Force the running and committing transactions to commit, | ||
2003 | * and wait on the commit. | ||
2004 | */ | ||
2005 | int ext3_force_commit(struct super_block *sb) | ||
2006 | { | ||
2007 | journal_t *journal; | ||
2008 | int ret; | ||
2009 | |||
2010 | if (sb->s_flags & MS_RDONLY) | ||
2011 | return 0; | ||
2012 | |||
2013 | journal = EXT3_SB(sb)->s_journal; | ||
2014 | sb->s_dirt = 0; | ||
2015 | ret = ext3_journal_force_commit(journal); | ||
2016 | return ret; | ||
2017 | } | ||
2018 | |||
2019 | /* | ||
2020 | * Ext3 always journals updates to the superblock itself, so we don't | ||
2021 | * have to propagate any other updates to the superblock on disk at this | ||
2022 | * point. Just start an async writeback to get the buffers on their way | ||
2023 | * to the disk. | ||
2024 | * | ||
2025 | * This implicitly triggers the writebehind on sync(). | ||
2026 | */ | ||
2027 | |||
2028 | static void ext3_write_super (struct super_block * sb) | ||
2029 | { | ||
2030 | if (down_trylock(&sb->s_lock) == 0) | ||
2031 | BUG(); | ||
2032 | sb->s_dirt = 0; | ||
2033 | } | ||
2034 | |||
2035 | static int ext3_sync_fs(struct super_block *sb, int wait) | ||
2036 | { | ||
2037 | tid_t target; | ||
2038 | |||
2039 | sb->s_dirt = 0; | ||
2040 | if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) { | ||
2041 | if (wait) | ||
2042 | log_wait_commit(EXT3_SB(sb)->s_journal, target); | ||
2043 | } | ||
2044 | return 0; | ||
2045 | } | ||
2046 | |||
2047 | /* | ||
2048 | * LVM calls this function before a (read-only) snapshot is created. This | ||
2049 | * gives us a chance to flush the journal completely and mark the fs clean. | ||
2050 | */ | ||
2051 | static void ext3_write_super_lockfs(struct super_block *sb) | ||
2052 | { | ||
2053 | sb->s_dirt = 0; | ||
2054 | |||
2055 | if (!(sb->s_flags & MS_RDONLY)) { | ||
2056 | journal_t *journal = EXT3_SB(sb)->s_journal; | ||
2057 | |||
2058 | /* Now we set up the journal barrier. */ | ||
2059 | journal_lock_updates(journal); | ||
2060 | journal_flush(journal); | ||
2061 | |||
2062 | /* Journal blocked and flushed, clear needs_recovery flag. */ | ||
2063 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | ||
2064 | ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); | ||
2065 | } | ||
2066 | } | ||
2067 | |||
2068 | /* | ||
2069 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | ||
2070 | * flag here, even though the filesystem is not technically dirty yet. | ||
2071 | */ | ||
2072 | static void ext3_unlockfs(struct super_block *sb) | ||
2073 | { | ||
2074 | if (!(sb->s_flags & MS_RDONLY)) { | ||
2075 | lock_super(sb); | ||
2076 | /* Reser the needs_recovery flag before the fs is unlocked. */ | ||
2077 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | ||
2078 | ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); | ||
2079 | unlock_super(sb); | ||
2080 | journal_unlock_updates(EXT3_SB(sb)->s_journal); | ||
2081 | } | ||
2082 | } | ||
2083 | |||
2084 | static int ext3_remount (struct super_block * sb, int * flags, char * data) | ||
2085 | { | ||
2086 | struct ext3_super_block * es; | ||
2087 | struct ext3_sb_info *sbi = EXT3_SB(sb); | ||
2088 | unsigned long tmp; | ||
2089 | unsigned long n_blocks_count = 0; | ||
2090 | |||
2091 | /* | ||
2092 | * Allow the "check" option to be passed as a remount option. | ||
2093 | */ | ||
2094 | if (!parse_options(data, sb, &tmp, &n_blocks_count, 1)) | ||
2095 | return -EINVAL; | ||
2096 | |||
2097 | if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) | ||
2098 | ext3_abort(sb, __FUNCTION__, "Abort forced by user"); | ||
2099 | |||
2100 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | ||
2101 | ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | ||
2102 | |||
2103 | es = sbi->s_es; | ||
2104 | |||
2105 | ext3_init_journal_params(sb, sbi->s_journal); | ||
2106 | |||
2107 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | ||
2108 | n_blocks_count > le32_to_cpu(es->s_blocks_count)) { | ||
2109 | if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) | ||
2110 | return -EROFS; | ||
2111 | |||
2112 | if (*flags & MS_RDONLY) { | ||
2113 | /* | ||
2114 | * First of all, the unconditional stuff we have to do | ||
2115 | * to disable replay of the journal when we next remount | ||
2116 | */ | ||
2117 | sb->s_flags |= MS_RDONLY; | ||
2118 | |||
2119 | /* | ||
2120 | * OK, test if we are remounting a valid rw partition | ||
2121 | * readonly, and if so set the rdonly flag and then | ||
2122 | * mark the partition as valid again. | ||
2123 | */ | ||
2124 | if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && | ||
2125 | (sbi->s_mount_state & EXT3_VALID_FS)) | ||
2126 | es->s_state = cpu_to_le16(sbi->s_mount_state); | ||
2127 | |||
2128 | ext3_mark_recovery_complete(sb, es); | ||
2129 | } else { | ||
2130 | __le32 ret; | ||
2131 | if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, | ||
2132 | ~EXT3_FEATURE_RO_COMPAT_SUPP))) { | ||
2133 | printk(KERN_WARNING "EXT3-fs: %s: couldn't " | ||
2134 | "remount RDWR because of unsupported " | ||
2135 | "optional features (%x).\n", | ||
2136 | sb->s_id, le32_to_cpu(ret)); | ||
2137 | return -EROFS; | ||
2138 | } | ||
2139 | /* | ||
2140 | * Mounting a RDONLY partition read-write, so reread | ||
2141 | * and store the current valid flag. (It may have | ||
2142 | * been changed by e2fsck since we originally mounted | ||
2143 | * the partition.) | ||
2144 | */ | ||
2145 | ext3_clear_journal_err(sb, es); | ||
2146 | sbi->s_mount_state = le16_to_cpu(es->s_state); | ||
2147 | if ((ret = ext3_group_extend(sb, es, n_blocks_count))) | ||
2148 | return ret; | ||
2149 | if (!ext3_setup_super (sb, es, 0)) | ||
2150 | sb->s_flags &= ~MS_RDONLY; | ||
2151 | } | ||
2152 | } | ||
2153 | return 0; | ||
2154 | } | ||
2155 | |||
2156 | static int ext3_statfs (struct super_block * sb, struct kstatfs * buf) | ||
2157 | { | ||
2158 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | ||
2159 | unsigned long overhead; | ||
2160 | int i; | ||
2161 | |||
2162 | if (test_opt (sb, MINIX_DF)) | ||
2163 | overhead = 0; | ||
2164 | else { | ||
2165 | unsigned long ngroups; | ||
2166 | ngroups = EXT3_SB(sb)->s_groups_count; | ||
2167 | smp_rmb(); | ||
2168 | |||
2169 | /* | ||
2170 | * Compute the overhead (FS structures) | ||
2171 | */ | ||
2172 | |||
2173 | /* | ||
2174 | * All of the blocks before first_data_block are | ||
2175 | * overhead | ||
2176 | */ | ||
2177 | overhead = le32_to_cpu(es->s_first_data_block); | ||
2178 | |||
2179 | /* | ||
2180 | * Add the overhead attributed to the superblock and | ||
2181 | * block group descriptors. If the sparse superblocks | ||
2182 | * feature is turned on, then not all groups have this. | ||
2183 | */ | ||
2184 | for (i = 0; i < ngroups; i++) { | ||
2185 | overhead += ext3_bg_has_super(sb, i) + | ||
2186 | ext3_bg_num_gdb(sb, i); | ||
2187 | cond_resched(); | ||
2188 | } | ||
2189 | |||
2190 | /* | ||
2191 | * Every block group has an inode bitmap, a block | ||
2192 | * bitmap, and an inode table. | ||
2193 | */ | ||
2194 | overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group)); | ||
2195 | } | ||
2196 | |||
2197 | buf->f_type = EXT3_SUPER_MAGIC; | ||
2198 | buf->f_bsize = sb->s_blocksize; | ||
2199 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; | ||
2200 | buf->f_bfree = ext3_count_free_blocks (sb); | ||
2201 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); | ||
2202 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | ||
2203 | buf->f_bavail = 0; | ||
2204 | buf->f_files = le32_to_cpu(es->s_inodes_count); | ||
2205 | buf->f_ffree = ext3_count_free_inodes (sb); | ||
2206 | buf->f_namelen = EXT3_NAME_LEN; | ||
2207 | return 0; | ||
2208 | } | ||
2209 | |||
2210 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | ||
2211 | * is locked for write. Otherwise the are possible deadlocks: | ||
2212 | * Process 1 Process 2 | ||
2213 | * ext3_create() quota_sync() | ||
2214 | * journal_start() write_dquot() | ||
2215 | * DQUOT_INIT() down(dqio_sem) | ||
2216 | * down(dqio_sem) journal_start() | ||
2217 | * | ||
2218 | */ | ||
2219 | |||
2220 | #ifdef CONFIG_QUOTA | ||
2221 | |||
2222 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | ||
2223 | { | ||
2224 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | ||
2225 | } | ||
2226 | |||
2227 | static int ext3_dquot_initialize(struct inode *inode, int type) | ||
2228 | { | ||
2229 | handle_t *handle; | ||
2230 | int ret, err; | ||
2231 | |||
2232 | /* We may create quota structure so we need to reserve enough blocks */ | ||
2233 | handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS); | ||
2234 | if (IS_ERR(handle)) | ||
2235 | return PTR_ERR(handle); | ||
2236 | ret = dquot_initialize(inode, type); | ||
2237 | err = ext3_journal_stop(handle); | ||
2238 | if (!ret) | ||
2239 | ret = err; | ||
2240 | return ret; | ||
2241 | } | ||
2242 | |||
2243 | static int ext3_dquot_drop(struct inode *inode) | ||
2244 | { | ||
2245 | handle_t *handle; | ||
2246 | int ret, err; | ||
2247 | |||
2248 | /* We may delete quota structure so we need to reserve enough blocks */ | ||
2249 | handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS); | ||
2250 | if (IS_ERR(handle)) | ||
2251 | return PTR_ERR(handle); | ||
2252 | ret = dquot_drop(inode); | ||
2253 | err = ext3_journal_stop(handle); | ||
2254 | if (!ret) | ||
2255 | ret = err; | ||
2256 | return ret; | ||
2257 | } | ||
2258 | |||
2259 | static int ext3_write_dquot(struct dquot *dquot) | ||
2260 | { | ||
2261 | int ret, err; | ||
2262 | handle_t *handle; | ||
2263 | struct inode *inode; | ||
2264 | |||
2265 | inode = dquot_to_inode(dquot); | ||
2266 | handle = ext3_journal_start(inode, | ||
2267 | EXT3_QUOTA_TRANS_BLOCKS); | ||
2268 | if (IS_ERR(handle)) | ||
2269 | return PTR_ERR(handle); | ||
2270 | ret = dquot_commit(dquot); | ||
2271 | err = ext3_journal_stop(handle); | ||
2272 | if (!ret) | ||
2273 | ret = err; | ||
2274 | return ret; | ||
2275 | } | ||
2276 | |||
2277 | static int ext3_acquire_dquot(struct dquot *dquot) | ||
2278 | { | ||
2279 | int ret, err; | ||
2280 | handle_t *handle; | ||
2281 | |||
2282 | handle = ext3_journal_start(dquot_to_inode(dquot), | ||
2283 | EXT3_QUOTA_INIT_BLOCKS); | ||
2284 | if (IS_ERR(handle)) | ||
2285 | return PTR_ERR(handle); | ||
2286 | ret = dquot_acquire(dquot); | ||
2287 | err = ext3_journal_stop(handle); | ||
2288 | if (!ret) | ||
2289 | ret = err; | ||
2290 | return ret; | ||
2291 | } | ||
2292 | |||
2293 | static int ext3_release_dquot(struct dquot *dquot) | ||
2294 | { | ||
2295 | int ret, err; | ||
2296 | handle_t *handle; | ||
2297 | |||
2298 | handle = ext3_journal_start(dquot_to_inode(dquot), | ||
2299 | EXT3_QUOTA_INIT_BLOCKS); | ||
2300 | if (IS_ERR(handle)) | ||
2301 | return PTR_ERR(handle); | ||
2302 | ret = dquot_release(dquot); | ||
2303 | err = ext3_journal_stop(handle); | ||
2304 | if (!ret) | ||
2305 | ret = err; | ||
2306 | return ret; | ||
2307 | } | ||
2308 | |||
2309 | static int ext3_mark_dquot_dirty(struct dquot *dquot) | ||
2310 | { | ||
2311 | /* Are we journalling quotas? */ | ||
2312 | if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || | ||
2313 | EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | ||
2314 | dquot_mark_dquot_dirty(dquot); | ||
2315 | return ext3_write_dquot(dquot); | ||
2316 | } else { | ||
2317 | return dquot_mark_dquot_dirty(dquot); | ||
2318 | } | ||
2319 | } | ||
2320 | |||
2321 | static int ext3_write_info(struct super_block *sb, int type) | ||
2322 | { | ||
2323 | int ret, err; | ||
2324 | handle_t *handle; | ||
2325 | |||
2326 | /* Data block + inode block */ | ||
2327 | handle = ext3_journal_start(sb->s_root->d_inode, 2); | ||
2328 | if (IS_ERR(handle)) | ||
2329 | return PTR_ERR(handle); | ||
2330 | ret = dquot_commit_info(sb, type); | ||
2331 | err = ext3_journal_stop(handle); | ||
2332 | if (!ret) | ||
2333 | ret = err; | ||
2334 | return ret; | ||
2335 | } | ||
2336 | |||
2337 | /* | ||
2338 | * Turn on quotas during mount time - we need to find | ||
2339 | * the quota file and such... | ||
2340 | */ | ||
2341 | static int ext3_quota_on_mount(struct super_block *sb, int type) | ||
2342 | { | ||
2343 | int err; | ||
2344 | struct dentry *dentry; | ||
2345 | struct qstr name = { .name = EXT3_SB(sb)->s_qf_names[type], | ||
2346 | .hash = 0, | ||
2347 | .len = strlen(EXT3_SB(sb)->s_qf_names[type])}; | ||
2348 | |||
2349 | dentry = lookup_hash(&name, sb->s_root); | ||
2350 | if (IS_ERR(dentry)) | ||
2351 | return PTR_ERR(dentry); | ||
2352 | err = vfs_quota_on_mount(type, EXT3_SB(sb)->s_jquota_fmt, dentry); | ||
2353 | /* Now invalidate and put the dentry - quota got its own reference | ||
2354 | * to inode and dentry has at least wrong hash so we had better | ||
2355 | * throw it away */ | ||
2356 | d_invalidate(dentry); | ||
2357 | dput(dentry); | ||
2358 | return err; | ||
2359 | } | ||
2360 | |||
2361 | /* | ||
2362 | * Standard function to be called on quota_on | ||
2363 | */ | ||
2364 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, | ||
2365 | char *path) | ||
2366 | { | ||
2367 | int err; | ||
2368 | struct nameidata nd; | ||
2369 | |||
2370 | /* Not journalling quota? */ | ||
2371 | if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] && | ||
2372 | !EXT3_SB(sb)->s_qf_names[GRPQUOTA]) | ||
2373 | return vfs_quota_on(sb, type, format_id, path); | ||
2374 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | ||
2375 | if (err) | ||
2376 | return err; | ||
2377 | /* Quotafile not on the same filesystem? */ | ||
2378 | if (nd.mnt->mnt_sb != sb) { | ||
2379 | path_release(&nd); | ||
2380 | return -EXDEV; | ||
2381 | } | ||
2382 | /* Quotafile not of fs root? */ | ||
2383 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | ||
2384 | printk(KERN_WARNING | ||
2385 | "EXT3-fs: Quota file not on filesystem root. " | ||
2386 | "Journalled quota will not work.\n"); | ||
2387 | path_release(&nd); | ||
2388 | return vfs_quota_on(sb, type, format_id, path); | ||
2389 | } | ||
2390 | |||
2391 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | ||
2392 | * acquiring the locks... As quota files are never truncated and quota code | ||
2393 | * itself serializes the operations (and noone else should touch the files) | ||
2394 | * we don't have to be afraid of races */ | ||
2395 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, | ||
2396 | size_t len, loff_t off) | ||
2397 | { | ||
2398 | struct inode *inode = sb_dqopt(sb)->files[type]; | ||
2399 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); | ||
2400 | int err = 0; | ||
2401 | int offset = off & (sb->s_blocksize - 1); | ||
2402 | int tocopy; | ||
2403 | size_t toread; | ||
2404 | struct buffer_head *bh; | ||
2405 | loff_t i_size = i_size_read(inode); | ||
2406 | |||
2407 | if (off > i_size) | ||
2408 | return 0; | ||
2409 | if (off+len > i_size) | ||
2410 | len = i_size-off; | ||
2411 | toread = len; | ||
2412 | while (toread > 0) { | ||
2413 | tocopy = sb->s_blocksize - offset < toread ? | ||
2414 | sb->s_blocksize - offset : toread; | ||
2415 | bh = ext3_bread(NULL, inode, blk, 0, &err); | ||
2416 | if (err) | ||
2417 | return err; | ||
2418 | if (!bh) /* A hole? */ | ||
2419 | memset(data, 0, tocopy); | ||
2420 | else | ||
2421 | memcpy(data, bh->b_data+offset, tocopy); | ||
2422 | brelse(bh); | ||
2423 | offset = 0; | ||
2424 | toread -= tocopy; | ||
2425 | data += tocopy; | ||
2426 | blk++; | ||
2427 | } | ||
2428 | return len; | ||
2429 | } | ||
2430 | |||
2431 | /* Write to quotafile (we know the transaction is already started and has | ||
2432 | * enough credits) */ | ||
2433 | static ssize_t ext3_quota_write(struct super_block *sb, int type, | ||
2434 | const char *data, size_t len, loff_t off) | ||
2435 | { | ||
2436 | struct inode *inode = sb_dqopt(sb)->files[type]; | ||
2437 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); | ||
2438 | int err = 0; | ||
2439 | int offset = off & (sb->s_blocksize - 1); | ||
2440 | int tocopy; | ||
2441 | int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL; | ||
2442 | size_t towrite = len; | ||
2443 | struct buffer_head *bh; | ||
2444 | handle_t *handle = journal_current_handle(); | ||
2445 | |||
2446 | down(&inode->i_sem); | ||
2447 | while (towrite > 0) { | ||
2448 | tocopy = sb->s_blocksize - offset < towrite ? | ||
2449 | sb->s_blocksize - offset : towrite; | ||
2450 | bh = ext3_bread(handle, inode, blk, 1, &err); | ||
2451 | if (!bh) | ||
2452 | goto out; | ||
2453 | if (journal_quota) { | ||
2454 | err = ext3_journal_get_write_access(handle, bh); | ||
2455 | if (err) { | ||
2456 | brelse(bh); | ||
2457 | goto out; | ||
2458 | } | ||
2459 | } | ||
2460 | lock_buffer(bh); | ||
2461 | memcpy(bh->b_data+offset, data, tocopy); | ||
2462 | flush_dcache_page(bh->b_page); | ||
2463 | unlock_buffer(bh); | ||
2464 | if (journal_quota) | ||
2465 | err = ext3_journal_dirty_metadata(handle, bh); | ||
2466 | else { | ||
2467 | /* Always do at least ordered writes for quotas */ | ||
2468 | err = ext3_journal_dirty_data(handle, bh); | ||
2469 | mark_buffer_dirty(bh); | ||
2470 | } | ||
2471 | brelse(bh); | ||
2472 | if (err) | ||
2473 | goto out; | ||
2474 | offset = 0; | ||
2475 | towrite -= tocopy; | ||
2476 | data += tocopy; | ||
2477 | blk++; | ||
2478 | } | ||
2479 | out: | ||
2480 | if (len == towrite) | ||
2481 | return err; | ||
2482 | if (inode->i_size < off+len-towrite) { | ||
2483 | i_size_write(inode, off+len-towrite); | ||
2484 | EXT3_I(inode)->i_disksize = inode->i_size; | ||
2485 | } | ||
2486 | inode->i_version++; | ||
2487 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | ||
2488 | ext3_mark_inode_dirty(handle, inode); | ||
2489 | up(&inode->i_sem); | ||
2490 | return len - towrite; | ||
2491 | } | ||
2492 | |||
2493 | #endif | ||
2494 | |||
2495 | static struct super_block *ext3_get_sb(struct file_system_type *fs_type, | ||
2496 | int flags, const char *dev_name, void *data) | ||
2497 | { | ||
2498 | return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super); | ||
2499 | } | ||
2500 | |||
2501 | static struct file_system_type ext3_fs_type = { | ||
2502 | .owner = THIS_MODULE, | ||
2503 | .name = "ext3", | ||
2504 | .get_sb = ext3_get_sb, | ||
2505 | .kill_sb = kill_block_super, | ||
2506 | .fs_flags = FS_REQUIRES_DEV, | ||
2507 | }; | ||
2508 | |||
2509 | static int __init init_ext3_fs(void) | ||
2510 | { | ||
2511 | int err = init_ext3_xattr(); | ||
2512 | if (err) | ||
2513 | return err; | ||
2514 | err = init_inodecache(); | ||
2515 | if (err) | ||
2516 | goto out1; | ||
2517 | err = register_filesystem(&ext3_fs_type); | ||
2518 | if (err) | ||
2519 | goto out; | ||
2520 | return 0; | ||
2521 | out: | ||
2522 | destroy_inodecache(); | ||
2523 | out1: | ||
2524 | exit_ext3_xattr(); | ||
2525 | return err; | ||
2526 | } | ||
2527 | |||
2528 | static void __exit exit_ext3_fs(void) | ||
2529 | { | ||
2530 | unregister_filesystem(&ext3_fs_type); | ||
2531 | destroy_inodecache(); | ||
2532 | exit_ext3_xattr(); | ||
2533 | } | ||
2534 | |||
2535 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | ||
2536 | MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); | ||
2537 | MODULE_LICENSE("GPL"); | ||
2538 | module_init(init_ext3_fs) | ||
2539 | module_exit(exit_ext3_fs) | ||