Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/ext3/super.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
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> | |
8fc2751b | 38 | #include <linux/seq_file.h> |
1da177e4 LT |
39 | #include <asm/uaccess.h> |
40 | #include "xattr.h" | |
41 | #include "acl.h" | |
42 | ||
43 | static int ext3_load_journal(struct super_block *, struct ext3_super_block *); | |
44 | static int ext3_create_journal(struct super_block *, struct ext3_super_block *, | |
45 | int); | |
46 | static void ext3_commit_super (struct super_block * sb, | |
47 | struct ext3_super_block * es, | |
48 | int sync); | |
49 | static void ext3_mark_recovery_complete(struct super_block * sb, | |
50 | struct ext3_super_block * es); | |
51 | static void ext3_clear_journal_err(struct super_block * sb, | |
52 | struct ext3_super_block * es); | |
53 | static int ext3_sync_fs(struct super_block *sb, int wait); | |
54 | static const char *ext3_decode_error(struct super_block * sb, int errno, | |
55 | char nbuf[16]); | |
56 | static int ext3_remount (struct super_block * sb, int * flags, char * data); | |
57 | static int ext3_statfs (struct super_block * sb, struct kstatfs * buf); | |
58 | static void ext3_unlockfs(struct super_block *sb); | |
59 | static void ext3_write_super (struct super_block * sb); | |
60 | static void ext3_write_super_lockfs(struct super_block *sb); | |
61 | ||
62 | /* | |
63 | * Wrappers for journal_start/end. | |
64 | * | |
65 | * The only special thing we need to do here is to make sure that all | |
66 | * journal_end calls result in the superblock being marked dirty, so | |
67 | * that sync() will call the filesystem's write_super callback if | |
68 | * appropriate. | |
69 | */ | |
70 | handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks) | |
71 | { | |
72 | journal_t *journal; | |
73 | ||
74 | if (sb->s_flags & MS_RDONLY) | |
75 | return ERR_PTR(-EROFS); | |
76 | ||
77 | /* Special case here: if the journal has aborted behind our | |
78 | * backs (eg. EIO in the commit thread), then we still need to | |
79 | * take the FS itself readonly cleanly. */ | |
80 | journal = EXT3_SB(sb)->s_journal; | |
81 | if (is_journal_aborted(journal)) { | |
82 | ext3_abort(sb, __FUNCTION__, | |
83 | "Detected aborted journal"); | |
84 | return ERR_PTR(-EROFS); | |
85 | } | |
86 | ||
87 | return journal_start(journal, nblocks); | |
88 | } | |
89 | ||
90 | /* | |
91 | * The only special thing we need to do here is to make sure that all | |
92 | * journal_stop calls result in the superblock being marked dirty, so | |
93 | * that sync() will call the filesystem's write_super callback if | |
94 | * appropriate. | |
95 | */ | |
96 | int __ext3_journal_stop(const char *where, handle_t *handle) | |
97 | { | |
98 | struct super_block *sb; | |
99 | int err; | |
100 | int rc; | |
101 | ||
102 | sb = handle->h_transaction->t_journal->j_private; | |
103 | err = handle->h_err; | |
104 | rc = journal_stop(handle); | |
105 | ||
106 | if (!err) | |
107 | err = rc; | |
108 | if (err) | |
109 | __ext3_std_error(sb, where, err); | |
110 | return err; | |
111 | } | |
112 | ||
113 | void ext3_journal_abort_handle(const char *caller, const char *err_fn, | |
114 | struct buffer_head *bh, handle_t *handle, int err) | |
115 | { | |
116 | char nbuf[16]; | |
117 | const char *errstr = ext3_decode_error(NULL, err, nbuf); | |
118 | ||
119 | if (bh) | |
120 | BUFFER_TRACE(bh, "abort"); | |
121 | ||
122 | if (!handle->h_err) | |
123 | handle->h_err = err; | |
124 | ||
125 | if (is_handle_aborted(handle)) | |
126 | return; | |
127 | ||
128 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
129 | caller, errstr, err_fn); | |
130 | ||
131 | journal_abort_handle(handle); | |
132 | } | |
133 | ||
134 | /* Deal with the reporting of failure conditions on a filesystem such as | |
135 | * inconsistencies detected or read IO failures. | |
136 | * | |
137 | * On ext2, we can store the error state of the filesystem in the | |
138 | * superblock. That is not possible on ext3, because we may have other | |
139 | * write ordering constraints on the superblock which prevent us from | |
140 | * writing it out straight away; and given that the journal is about to | |
141 | * be aborted, we can't rely on the current, or future, transactions to | |
142 | * write out the superblock safely. | |
143 | * | |
144 | * We'll just use the journal_abort() error code to record an error in | |
145 | * the journal instead. On recovery, the journal will compain about | |
146 | * that error until we've noted it down and cleared it. | |
147 | */ | |
148 | ||
149 | static void ext3_handle_error(struct super_block *sb) | |
150 | { | |
151 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | |
152 | ||
153 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | |
154 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); | |
155 | ||
156 | if (sb->s_flags & MS_RDONLY) | |
157 | return; | |
158 | ||
159 | if (test_opt (sb, ERRORS_RO)) { | |
160 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
161 | sb->s_flags |= MS_RDONLY; | |
162 | } else { | |
163 | journal_t *journal = EXT3_SB(sb)->s_journal; | |
164 | ||
165 | EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; | |
166 | if (journal) | |
167 | journal_abort(journal, -EIO); | |
168 | } | |
169 | if (test_opt(sb, ERRORS_PANIC)) | |
170 | panic("EXT3-fs (device %s): panic forced after error\n", | |
171 | sb->s_id); | |
172 | ext3_commit_super(sb, es, 1); | |
173 | } | |
174 | ||
175 | void ext3_error (struct super_block * sb, const char * function, | |
176 | const char * fmt, ...) | |
177 | { | |
178 | va_list args; | |
179 | ||
180 | va_start(args, fmt); | |
181 | printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function); | |
182 | vprintk(fmt, args); | |
183 | printk("\n"); | |
184 | va_end(args); | |
185 | ||
186 | ext3_handle_error(sb); | |
187 | } | |
188 | ||
189 | static const char *ext3_decode_error(struct super_block * sb, int errno, | |
190 | char nbuf[16]) | |
191 | { | |
192 | char *errstr = NULL; | |
193 | ||
194 | switch (errno) { | |
195 | case -EIO: | |
196 | errstr = "IO failure"; | |
197 | break; | |
198 | case -ENOMEM: | |
199 | errstr = "Out of memory"; | |
200 | break; | |
201 | case -EROFS: | |
202 | if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) | |
203 | errstr = "Journal has aborted"; | |
204 | else | |
205 | errstr = "Readonly filesystem"; | |
206 | break; | |
207 | default: | |
208 | /* If the caller passed in an extra buffer for unknown | |
209 | * errors, textualise them now. Else we just return | |
210 | * NULL. */ | |
211 | if (nbuf) { | |
212 | /* Check for truncated error codes... */ | |
213 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
214 | errstr = nbuf; | |
215 | } | |
216 | break; | |
217 | } | |
218 | ||
219 | return errstr; | |
220 | } | |
221 | ||
222 | /* __ext3_std_error decodes expected errors from journaling functions | |
223 | * automatically and invokes the appropriate error response. */ | |
224 | ||
225 | void __ext3_std_error (struct super_block * sb, const char * function, | |
226 | int errno) | |
227 | { | |
228 | char nbuf[16]; | |
30121624 | 229 | const char *errstr; |
1da177e4 | 230 | |
30121624 ST |
231 | /* Special case: if the error is EROFS, and we're not already |
232 | * inside a transaction, then there's really no point in logging | |
233 | * an error. */ | |
234 | if (errno == -EROFS && journal_current_handle() == NULL && | |
235 | (sb->s_flags & MS_RDONLY)) | |
236 | return; | |
237 | ||
238 | errstr = ext3_decode_error(sb, errno, nbuf); | |
1da177e4 LT |
239 | printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n", |
240 | sb->s_id, function, errstr); | |
241 | ||
242 | ext3_handle_error(sb); | |
243 | } | |
244 | ||
245 | /* | |
246 | * ext3_abort is a much stronger failure handler than ext3_error. The | |
247 | * abort function may be used to deal with unrecoverable failures such | |
248 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
249 | * | |
250 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
251 | * unless the error response on the fs has been set to panic in which | |
252 | * case we take the easy way out and panic immediately. | |
253 | */ | |
254 | ||
255 | void ext3_abort (struct super_block * sb, const char * function, | |
256 | const char * fmt, ...) | |
257 | { | |
258 | va_list args; | |
259 | ||
260 | printk (KERN_CRIT "ext3_abort called.\n"); | |
261 | ||
262 | va_start(args, fmt); | |
263 | printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function); | |
264 | vprintk(fmt, args); | |
265 | printk("\n"); | |
266 | va_end(args); | |
267 | ||
268 | if (test_opt(sb, ERRORS_PANIC)) | |
269 | panic("EXT3-fs panic from previous error\n"); | |
270 | ||
271 | if (sb->s_flags & MS_RDONLY) | |
272 | return; | |
273 | ||
274 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
275 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | |
276 | sb->s_flags |= MS_RDONLY; | |
277 | EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; | |
278 | journal_abort(EXT3_SB(sb)->s_journal, -EIO); | |
279 | } | |
280 | ||
281 | void ext3_warning (struct super_block * sb, const char * function, | |
282 | const char * fmt, ...) | |
283 | { | |
284 | va_list args; | |
285 | ||
286 | va_start(args, fmt); | |
287 | printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ", | |
288 | sb->s_id, function); | |
289 | vprintk(fmt, args); | |
290 | printk("\n"); | |
291 | va_end(args); | |
292 | } | |
293 | ||
294 | void ext3_update_dynamic_rev(struct super_block *sb) | |
295 | { | |
296 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | |
297 | ||
298 | if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) | |
299 | return; | |
300 | ||
301 | ext3_warning(sb, __FUNCTION__, | |
302 | "updating to rev %d because of new feature flag, " | |
303 | "running e2fsck is recommended", | |
304 | EXT3_DYNAMIC_REV); | |
305 | ||
306 | es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); | |
307 | es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); | |
308 | es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); | |
309 | /* leave es->s_feature_*compat flags alone */ | |
310 | /* es->s_uuid will be set by e2fsck if empty */ | |
311 | ||
312 | /* | |
313 | * The rest of the superblock fields should be zero, and if not it | |
314 | * means they are likely already in use, so leave them alone. We | |
315 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
316 | */ | |
317 | } | |
318 | ||
319 | /* | |
320 | * Open the external journal device | |
321 | */ | |
322 | static struct block_device *ext3_blkdev_get(dev_t dev) | |
323 | { | |
324 | struct block_device *bdev; | |
325 | char b[BDEVNAME_SIZE]; | |
326 | ||
327 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
328 | if (IS_ERR(bdev)) | |
329 | goto fail; | |
330 | return bdev; | |
331 | ||
332 | fail: | |
333 | printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n", | |
334 | __bdevname(dev, b), PTR_ERR(bdev)); | |
335 | return NULL; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Release the journal device | |
340 | */ | |
341 | static int ext3_blkdev_put(struct block_device *bdev) | |
342 | { | |
343 | bd_release(bdev); | |
344 | return blkdev_put(bdev); | |
345 | } | |
346 | ||
347 | static int ext3_blkdev_remove(struct ext3_sb_info *sbi) | |
348 | { | |
349 | struct block_device *bdev; | |
350 | int ret = -ENODEV; | |
351 | ||
352 | bdev = sbi->journal_bdev; | |
353 | if (bdev) { | |
354 | ret = ext3_blkdev_put(bdev); | |
355 | sbi->journal_bdev = NULL; | |
356 | } | |
357 | return ret; | |
358 | } | |
359 | ||
360 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
361 | { | |
362 | return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; | |
363 | } | |
364 | ||
365 | static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) | |
366 | { | |
367 | struct list_head *l; | |
368 | ||
369 | printk(KERN_ERR "sb orphan head is %d\n", | |
370 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
371 | ||
372 | printk(KERN_ERR "sb_info orphan list:\n"); | |
373 | list_for_each(l, &sbi->s_orphan) { | |
374 | struct inode *inode = orphan_list_entry(l); | |
375 | printk(KERN_ERR " " | |
376 | "inode %s:%ld at %p: mode %o, nlink %d, next %d\n", | |
377 | inode->i_sb->s_id, inode->i_ino, inode, | |
378 | inode->i_mode, inode->i_nlink, | |
379 | NEXT_ORPHAN(inode)); | |
380 | } | |
381 | } | |
382 | ||
383 | static void ext3_put_super (struct super_block * sb) | |
384 | { | |
385 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
386 | struct ext3_super_block *es = sbi->s_es; | |
387 | int i; | |
388 | ||
389 | ext3_xattr_put_super(sb); | |
390 | journal_destroy(sbi->s_journal); | |
391 | if (!(sb->s_flags & MS_RDONLY)) { | |
392 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
393 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
394 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
395 | mark_buffer_dirty(sbi->s_sbh); | |
396 | ext3_commit_super(sb, es, 1); | |
397 | } | |
398 | ||
399 | for (i = 0; i < sbi->s_gdb_count; i++) | |
400 | brelse(sbi->s_group_desc[i]); | |
401 | kfree(sbi->s_group_desc); | |
402 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
403 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
404 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
405 | brelse(sbi->s_sbh); | |
406 | #ifdef CONFIG_QUOTA | |
407 | for (i = 0; i < MAXQUOTAS; i++) | |
408 | kfree(sbi->s_qf_names[i]); | |
409 | #endif | |
410 | ||
411 | /* Debugging code just in case the in-memory inode orphan list | |
412 | * isn't empty. The on-disk one can be non-empty if we've | |
413 | * detected an error and taken the fs readonly, but the | |
414 | * in-memory list had better be clean by this point. */ | |
415 | if (!list_empty(&sbi->s_orphan)) | |
416 | dump_orphan_list(sb, sbi); | |
417 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
418 | ||
419 | invalidate_bdev(sb->s_bdev, 0); | |
420 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { | |
421 | /* | |
422 | * Invalidate the journal device's buffers. We don't want them | |
423 | * floating about in memory - the physical journal device may | |
424 | * hotswapped, and it breaks the `ro-after' testing code. | |
425 | */ | |
426 | sync_blockdev(sbi->journal_bdev); | |
427 | invalidate_bdev(sbi->journal_bdev, 0); | |
428 | ext3_blkdev_remove(sbi); | |
429 | } | |
430 | sb->s_fs_info = NULL; | |
431 | kfree(sbi); | |
432 | return; | |
433 | } | |
434 | ||
435 | static kmem_cache_t *ext3_inode_cachep; | |
436 | ||
437 | /* | |
438 | * Called inside transaction, so use GFP_NOFS | |
439 | */ | |
440 | static struct inode *ext3_alloc_inode(struct super_block *sb) | |
441 | { | |
442 | struct ext3_inode_info *ei; | |
443 | ||
444 | ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS); | |
445 | if (!ei) | |
446 | return NULL; | |
447 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | |
448 | ei->i_acl = EXT3_ACL_NOT_CACHED; | |
449 | ei->i_default_acl = EXT3_ACL_NOT_CACHED; | |
450 | #endif | |
451 | ei->i_block_alloc_info = NULL; | |
452 | ei->vfs_inode.i_version = 1; | |
453 | return &ei->vfs_inode; | |
454 | } | |
455 | ||
456 | static void ext3_destroy_inode(struct inode *inode) | |
457 | { | |
458 | kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); | |
459 | } | |
460 | ||
461 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
462 | { | |
463 | struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; | |
464 | ||
465 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
466 | SLAB_CTOR_CONSTRUCTOR) { | |
467 | INIT_LIST_HEAD(&ei->i_orphan); | |
468 | #ifdef CONFIG_EXT3_FS_XATTR | |
469 | init_rwsem(&ei->xattr_sem); | |
470 | #endif | |
471 | init_MUTEX(&ei->truncate_sem); | |
472 | inode_init_once(&ei->vfs_inode); | |
473 | } | |
474 | } | |
475 | ||
476 | static int init_inodecache(void) | |
477 | { | |
478 | ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", | |
479 | sizeof(struct ext3_inode_info), | |
480 | 0, SLAB_RECLAIM_ACCOUNT, | |
481 | init_once, NULL); | |
482 | if (ext3_inode_cachep == NULL) | |
483 | return -ENOMEM; | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static void destroy_inodecache(void) | |
488 | { | |
489 | if (kmem_cache_destroy(ext3_inode_cachep)) | |
490 | printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n"); | |
491 | } | |
492 | ||
493 | static void ext3_clear_inode(struct inode *inode) | |
494 | { | |
495 | struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info; | |
496 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | |
497 | if (EXT3_I(inode)->i_acl && | |
498 | EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) { | |
499 | posix_acl_release(EXT3_I(inode)->i_acl); | |
500 | EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED; | |
501 | } | |
502 | if (EXT3_I(inode)->i_default_acl && | |
503 | EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) { | |
504 | posix_acl_release(EXT3_I(inode)->i_default_acl); | |
505 | EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED; | |
506 | } | |
507 | #endif | |
508 | ext3_discard_reservation(inode); | |
509 | EXT3_I(inode)->i_block_alloc_info = NULL; | |
510 | kfree(rsv); | |
511 | } | |
512 | ||
8fc2751b MB |
513 | static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs) |
514 | { | |
275abf5b OH |
515 | struct super_block *sb = vfs->mnt_sb; |
516 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
8fc2751b | 517 | |
275abf5b | 518 | if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA) |
8fc2751b | 519 | seq_puts(seq, ",data=journal"); |
275abf5b | 520 | else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA) |
8fc2751b | 521 | seq_puts(seq, ",data=ordered"); |
275abf5b | 522 | else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA) |
8fc2751b MB |
523 | seq_puts(seq, ",data=writeback"); |
524 | ||
525 | #if defined(CONFIG_QUOTA) | |
526 | if (sbi->s_jquota_fmt) | |
527 | seq_printf(seq, ",jqfmt=%s", | |
528 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
529 | ||
530 | if (sbi->s_qf_names[USRQUOTA]) | |
531 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
532 | ||
533 | if (sbi->s_qf_names[GRPQUOTA]) | |
534 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
535 | ||
536 | if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) | |
537 | seq_puts(seq, ",usrquota"); | |
538 | ||
539 | if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) | |
540 | seq_puts(seq, ",grpquota"); | |
541 | #endif | |
542 | ||
543 | return 0; | |
544 | } | |
1da177e4 | 545 | |
8fc2751b | 546 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
547 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") |
548 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
549 | ||
550 | static int ext3_dquot_initialize(struct inode *inode, int type); | |
551 | static int ext3_dquot_drop(struct inode *inode); | |
552 | static int ext3_write_dquot(struct dquot *dquot); | |
553 | static int ext3_acquire_dquot(struct dquot *dquot); | |
554 | static int ext3_release_dquot(struct dquot *dquot); | |
555 | static int ext3_mark_dquot_dirty(struct dquot *dquot); | |
556 | static int ext3_write_info(struct super_block *sb, int type); | |
557 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
558 | static int ext3_quota_on_mount(struct super_block *sb, int type); | |
559 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, | |
560 | size_t len, loff_t off); | |
561 | static ssize_t ext3_quota_write(struct super_block *sb, int type, | |
562 | const char *data, size_t len, loff_t off); | |
563 | ||
564 | static struct dquot_operations ext3_quota_operations = { | |
565 | .initialize = ext3_dquot_initialize, | |
566 | .drop = ext3_dquot_drop, | |
567 | .alloc_space = dquot_alloc_space, | |
568 | .alloc_inode = dquot_alloc_inode, | |
569 | .free_space = dquot_free_space, | |
570 | .free_inode = dquot_free_inode, | |
571 | .transfer = dquot_transfer, | |
572 | .write_dquot = ext3_write_dquot, | |
573 | .acquire_dquot = ext3_acquire_dquot, | |
574 | .release_dquot = ext3_release_dquot, | |
575 | .mark_dirty = ext3_mark_dquot_dirty, | |
576 | .write_info = ext3_write_info | |
577 | }; | |
578 | ||
579 | static struct quotactl_ops ext3_qctl_operations = { | |
580 | .quota_on = ext3_quota_on, | |
581 | .quota_off = vfs_quota_off, | |
582 | .quota_sync = vfs_quota_sync, | |
583 | .get_info = vfs_get_dqinfo, | |
584 | .set_info = vfs_set_dqinfo, | |
585 | .get_dqblk = vfs_get_dqblk, | |
586 | .set_dqblk = vfs_set_dqblk | |
587 | }; | |
588 | #endif | |
589 | ||
590 | static struct super_operations ext3_sops = { | |
591 | .alloc_inode = ext3_alloc_inode, | |
592 | .destroy_inode = ext3_destroy_inode, | |
593 | .read_inode = ext3_read_inode, | |
594 | .write_inode = ext3_write_inode, | |
595 | .dirty_inode = ext3_dirty_inode, | |
596 | .delete_inode = ext3_delete_inode, | |
597 | .put_super = ext3_put_super, | |
598 | .write_super = ext3_write_super, | |
599 | .sync_fs = ext3_sync_fs, | |
600 | .write_super_lockfs = ext3_write_super_lockfs, | |
601 | .unlockfs = ext3_unlockfs, | |
602 | .statfs = ext3_statfs, | |
603 | .remount_fs = ext3_remount, | |
604 | .clear_inode = ext3_clear_inode, | |
8fc2751b | 605 | .show_options = ext3_show_options, |
1da177e4 LT |
606 | #ifdef CONFIG_QUOTA |
607 | .quota_read = ext3_quota_read, | |
608 | .quota_write = ext3_quota_write, | |
609 | #endif | |
610 | }; | |
611 | ||
612 | struct dentry *ext3_get_parent(struct dentry *child); | |
613 | static struct export_operations ext3_export_ops = { | |
614 | .get_parent = ext3_get_parent, | |
615 | }; | |
616 | ||
617 | enum { | |
618 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
619 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
620 | Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
621 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
622 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, | |
623 | Opt_commit, Opt_journal_update, Opt_journal_inum, | |
624 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
625 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
1f54587b | 626 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, |
8fc2751b MB |
627 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, |
628 | Opt_grpquota | |
1da177e4 LT |
629 | }; |
630 | ||
631 | static match_table_t tokens = { | |
632 | {Opt_bsd_df, "bsddf"}, | |
633 | {Opt_minix_df, "minixdf"}, | |
634 | {Opt_grpid, "grpid"}, | |
635 | {Opt_grpid, "bsdgroups"}, | |
636 | {Opt_nogrpid, "nogrpid"}, | |
637 | {Opt_nogrpid, "sysvgroups"}, | |
638 | {Opt_resgid, "resgid=%u"}, | |
639 | {Opt_resuid, "resuid=%u"}, | |
640 | {Opt_sb, "sb=%u"}, | |
641 | {Opt_err_cont, "errors=continue"}, | |
642 | {Opt_err_panic, "errors=panic"}, | |
643 | {Opt_err_ro, "errors=remount-ro"}, | |
644 | {Opt_nouid32, "nouid32"}, | |
645 | {Opt_nocheck, "nocheck"}, | |
646 | {Opt_nocheck, "check=none"}, | |
647 | {Opt_check, "check"}, | |
648 | {Opt_debug, "debug"}, | |
649 | {Opt_oldalloc, "oldalloc"}, | |
650 | {Opt_orlov, "orlov"}, | |
651 | {Opt_user_xattr, "user_xattr"}, | |
652 | {Opt_nouser_xattr, "nouser_xattr"}, | |
653 | {Opt_acl, "acl"}, | |
654 | {Opt_noacl, "noacl"}, | |
655 | {Opt_reservation, "reservation"}, | |
656 | {Opt_noreservation, "noreservation"}, | |
657 | {Opt_noload, "noload"}, | |
658 | {Opt_nobh, "nobh"}, | |
659 | {Opt_commit, "commit=%u"}, | |
660 | {Opt_journal_update, "journal=update"}, | |
661 | {Opt_journal_inum, "journal=%u"}, | |
662 | {Opt_abort, "abort"}, | |
663 | {Opt_data_journal, "data=journal"}, | |
664 | {Opt_data_ordered, "data=ordered"}, | |
665 | {Opt_data_writeback, "data=writeback"}, | |
666 | {Opt_offusrjquota, "usrjquota="}, | |
667 | {Opt_usrjquota, "usrjquota=%s"}, | |
668 | {Opt_offgrpjquota, "grpjquota="}, | |
669 | {Opt_grpjquota, "grpjquota=%s"}, | |
670 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
671 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
8fc2751b | 672 | {Opt_grpquota, "grpquota"}, |
1f54587b JK |
673 | {Opt_noquota, "noquota"}, |
674 | {Opt_quota, "quota"}, | |
8fc2751b | 675 | {Opt_usrquota, "usrquota"}, |
1da177e4 LT |
676 | {Opt_barrier, "barrier=%u"}, |
677 | {Opt_err, NULL}, | |
678 | {Opt_resize, "resize"}, | |
679 | }; | |
680 | ||
681 | static unsigned long get_sb_block(void **data) | |
682 | { | |
683 | unsigned long sb_block; | |
684 | char *options = (char *) *data; | |
685 | ||
686 | if (!options || strncmp(options, "sb=", 3) != 0) | |
687 | return 1; /* Default location */ | |
688 | options += 3; | |
689 | sb_block = simple_strtoul(options, &options, 0); | |
690 | if (*options && *options != ',') { | |
691 | printk("EXT3-fs: Invalid sb specification: %s\n", | |
692 | (char *) *data); | |
693 | return 1; | |
694 | } | |
695 | if (*options == ',') | |
696 | options++; | |
697 | *data = (void *) options; | |
698 | return sb_block; | |
699 | } | |
700 | ||
701 | static int parse_options (char * options, struct super_block *sb, | |
702 | unsigned long * inum, unsigned long *n_blocks_count, int is_remount) | |
703 | { | |
704 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
705 | char * p; | |
706 | substring_t args[MAX_OPT_ARGS]; | |
707 | int data_opt = 0; | |
708 | int option; | |
709 | #ifdef CONFIG_QUOTA | |
710 | int qtype; | |
711 | char *qname; | |
712 | #endif | |
713 | ||
714 | if (!options) | |
715 | return 1; | |
716 | ||
717 | while ((p = strsep (&options, ",")) != NULL) { | |
718 | int token; | |
719 | if (!*p) | |
720 | continue; | |
721 | ||
722 | token = match_token(p, tokens, args); | |
723 | switch (token) { | |
724 | case Opt_bsd_df: | |
725 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
726 | break; | |
727 | case Opt_minix_df: | |
728 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
729 | break; | |
730 | case Opt_grpid: | |
731 | set_opt (sbi->s_mount_opt, GRPID); | |
732 | break; | |
733 | case Opt_nogrpid: | |
734 | clear_opt (sbi->s_mount_opt, GRPID); | |
735 | break; | |
736 | case Opt_resuid: | |
737 | if (match_int(&args[0], &option)) | |
738 | return 0; | |
739 | sbi->s_resuid = option; | |
740 | break; | |
741 | case Opt_resgid: | |
742 | if (match_int(&args[0], &option)) | |
743 | return 0; | |
744 | sbi->s_resgid = option; | |
745 | break; | |
746 | case Opt_sb: | |
747 | /* handled by get_sb_block() instead of here */ | |
748 | /* *sb_block = match_int(&args[0]); */ | |
749 | break; | |
750 | case Opt_err_panic: | |
751 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
752 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
753 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
754 | break; | |
755 | case Opt_err_ro: | |
756 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
757 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
758 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
759 | break; | |
760 | case Opt_err_cont: | |
761 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
762 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
763 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
764 | break; | |
765 | case Opt_nouid32: | |
766 | set_opt (sbi->s_mount_opt, NO_UID32); | |
767 | break; | |
768 | case Opt_check: | |
769 | #ifdef CONFIG_EXT3_CHECK | |
770 | set_opt (sbi->s_mount_opt, CHECK); | |
771 | #else | |
772 | printk(KERN_ERR | |
773 | "EXT3 Check option not supported\n"); | |
774 | #endif | |
775 | break; | |
776 | case Opt_nocheck: | |
777 | clear_opt (sbi->s_mount_opt, CHECK); | |
778 | break; | |
779 | case Opt_debug: | |
780 | set_opt (sbi->s_mount_opt, DEBUG); | |
781 | break; | |
782 | case Opt_oldalloc: | |
783 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
784 | break; | |
785 | case Opt_orlov: | |
786 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
787 | break; | |
788 | #ifdef CONFIG_EXT3_FS_XATTR | |
789 | case Opt_user_xattr: | |
790 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
791 | break; | |
792 | case Opt_nouser_xattr: | |
793 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
794 | break; | |
795 | #else | |
796 | case Opt_user_xattr: | |
797 | case Opt_nouser_xattr: | |
798 | printk("EXT3 (no)user_xattr options not supported\n"); | |
799 | break; | |
800 | #endif | |
801 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | |
802 | case Opt_acl: | |
803 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
804 | break; | |
805 | case Opt_noacl: | |
806 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
807 | break; | |
808 | #else | |
809 | case Opt_acl: | |
810 | case Opt_noacl: | |
811 | printk("EXT3 (no)acl options not supported\n"); | |
812 | break; | |
813 | #endif | |
814 | case Opt_reservation: | |
815 | set_opt(sbi->s_mount_opt, RESERVATION); | |
816 | break; | |
817 | case Opt_noreservation: | |
818 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
819 | break; | |
820 | case Opt_journal_update: | |
821 | /* @@@ FIXME */ | |
822 | /* Eventually we will want to be able to create | |
823 | a journal file here. For now, only allow the | |
824 | user to specify an existing inode to be the | |
825 | journal file. */ | |
826 | if (is_remount) { | |
827 | printk(KERN_ERR "EXT3-fs: cannot specify " | |
828 | "journal on remount\n"); | |
829 | return 0; | |
830 | } | |
831 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
832 | break; | |
833 | case Opt_journal_inum: | |
834 | if (is_remount) { | |
835 | printk(KERN_ERR "EXT3-fs: cannot specify " | |
836 | "journal on remount\n"); | |
837 | return 0; | |
838 | } | |
839 | if (match_int(&args[0], &option)) | |
840 | return 0; | |
841 | *inum = option; | |
842 | break; | |
843 | case Opt_noload: | |
844 | set_opt (sbi->s_mount_opt, NOLOAD); | |
845 | break; | |
846 | case Opt_commit: | |
847 | if (match_int(&args[0], &option)) | |
848 | return 0; | |
849 | if (option < 0) | |
850 | return 0; | |
851 | if (option == 0) | |
852 | option = JBD_DEFAULT_MAX_COMMIT_AGE; | |
853 | sbi->s_commit_interval = HZ * option; | |
854 | break; | |
855 | case Opt_data_journal: | |
856 | data_opt = EXT3_MOUNT_JOURNAL_DATA; | |
857 | goto datacheck; | |
858 | case Opt_data_ordered: | |
859 | data_opt = EXT3_MOUNT_ORDERED_DATA; | |
860 | goto datacheck; | |
861 | case Opt_data_writeback: | |
862 | data_opt = EXT3_MOUNT_WRITEBACK_DATA; | |
863 | datacheck: | |
864 | if (is_remount) { | |
865 | if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS) | |
866 | != data_opt) { | |
867 | printk(KERN_ERR | |
868 | "EXT3-fs: cannot change data " | |
869 | "mode on remount\n"); | |
870 | return 0; | |
871 | } | |
872 | } else { | |
873 | sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS; | |
874 | sbi->s_mount_opt |= data_opt; | |
875 | } | |
876 | break; | |
877 | #ifdef CONFIG_QUOTA | |
878 | case Opt_usrjquota: | |
879 | qtype = USRQUOTA; | |
880 | goto set_qf_name; | |
881 | case Opt_grpjquota: | |
882 | qtype = GRPQUOTA; | |
883 | set_qf_name: | |
884 | if (sb_any_quota_enabled(sb)) { | |
885 | printk(KERN_ERR | |
886 | "EXT3-fs: Cannot change journalled " | |
887 | "quota options when quota turned on.\n"); | |
888 | return 0; | |
889 | } | |
890 | qname = match_strdup(&args[0]); | |
891 | if (!qname) { | |
892 | printk(KERN_ERR | |
893 | "EXT3-fs: not enough memory for " | |
894 | "storing quotafile name.\n"); | |
895 | return 0; | |
896 | } | |
897 | if (sbi->s_qf_names[qtype] && | |
898 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
899 | printk(KERN_ERR | |
900 | "EXT3-fs: %s quota file already " | |
901 | "specified.\n", QTYPE2NAME(qtype)); | |
902 | kfree(qname); | |
903 | return 0; | |
904 | } | |
905 | sbi->s_qf_names[qtype] = qname; | |
906 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
907 | printk(KERN_ERR | |
908 | "EXT3-fs: quotafile must be on " | |
909 | "filesystem root.\n"); | |
910 | kfree(sbi->s_qf_names[qtype]); | |
911 | sbi->s_qf_names[qtype] = NULL; | |
912 | return 0; | |
913 | } | |
1f54587b | 914 | set_opt(sbi->s_mount_opt, QUOTA); |
1da177e4 LT |
915 | break; |
916 | case Opt_offusrjquota: | |
917 | qtype = USRQUOTA; | |
918 | goto clear_qf_name; | |
919 | case Opt_offgrpjquota: | |
920 | qtype = GRPQUOTA; | |
921 | clear_qf_name: | |
922 | if (sb_any_quota_enabled(sb)) { | |
923 | printk(KERN_ERR "EXT3-fs: Cannot change " | |
924 | "journalled quota options when " | |
925 | "quota turned on.\n"); | |
926 | return 0; | |
927 | } | |
08c6a96f JK |
928 | /* |
929 | * The space will be released later when all options | |
930 | * are confirmed to be correct | |
931 | */ | |
1da177e4 LT |
932 | sbi->s_qf_names[qtype] = NULL; |
933 | break; | |
934 | case Opt_jqfmt_vfsold: | |
935 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
936 | break; | |
937 | case Opt_jqfmt_vfsv0: | |
938 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
939 | break; | |
1f54587b | 940 | case Opt_quota: |
8fc2751b MB |
941 | case Opt_usrquota: |
942 | set_opt(sbi->s_mount_opt, QUOTA); | |
943 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
944 | break; | |
945 | case Opt_grpquota: | |
1f54587b | 946 | set_opt(sbi->s_mount_opt, QUOTA); |
8fc2751b | 947 | set_opt(sbi->s_mount_opt, GRPQUOTA); |
1f54587b JK |
948 | break; |
949 | case Opt_noquota: | |
950 | if (sb_any_quota_enabled(sb)) { | |
951 | printk(KERN_ERR "EXT3-fs: Cannot change quota " | |
952 | "options when quota turned on.\n"); | |
953 | return 0; | |
954 | } | |
955 | clear_opt(sbi->s_mount_opt, QUOTA); | |
8fc2751b MB |
956 | clear_opt(sbi->s_mount_opt, USRQUOTA); |
957 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1f54587b | 958 | break; |
1da177e4 | 959 | #else |
8fc2751b MB |
960 | case Opt_quota: |
961 | case Opt_usrquota: | |
962 | case Opt_grpquota: | |
1da177e4 LT |
963 | case Opt_usrjquota: |
964 | case Opt_grpjquota: | |
965 | case Opt_offusrjquota: | |
966 | case Opt_offgrpjquota: | |
967 | case Opt_jqfmt_vfsold: | |
968 | case Opt_jqfmt_vfsv0: | |
969 | printk(KERN_ERR | |
970 | "EXT3-fs: journalled quota options not " | |
971 | "supported.\n"); | |
972 | break; | |
1f54587b JK |
973 | case Opt_noquota: |
974 | break; | |
1da177e4 LT |
975 | #endif |
976 | case Opt_abort: | |
977 | set_opt(sbi->s_mount_opt, ABORT); | |
978 | break; | |
979 | case Opt_barrier: | |
980 | if (match_int(&args[0], &option)) | |
981 | return 0; | |
982 | if (option) | |
983 | set_opt(sbi->s_mount_opt, BARRIER); | |
984 | else | |
985 | clear_opt(sbi->s_mount_opt, BARRIER); | |
986 | break; | |
987 | case Opt_ignore: | |
988 | break; | |
989 | case Opt_resize: | |
08c6a96f | 990 | if (!is_remount) { |
1da177e4 LT |
991 | printk("EXT3-fs: resize option only available " |
992 | "for remount\n"); | |
993 | return 0; | |
994 | } | |
c7f1721e KZ |
995 | if (match_int(&args[0], &option) != 0) |
996 | return 0; | |
1da177e4 LT |
997 | *n_blocks_count = option; |
998 | break; | |
999 | case Opt_nobh: | |
1000 | set_opt(sbi->s_mount_opt, NOBH); | |
1001 | break; | |
1002 | default: | |
1003 | printk (KERN_ERR | |
1004 | "EXT3-fs: Unrecognized mount option \"%s\" " | |
1005 | "or missing value\n", p); | |
1006 | return 0; | |
1007 | } | |
1008 | } | |
1009 | #ifdef CONFIG_QUOTA | |
8fc2751b MB |
1010 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { |
1011 | if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) && | |
1012 | sbi->s_qf_names[USRQUOTA]) | |
1013 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1014 | ||
1015 | if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) && | |
1016 | sbi->s_qf_names[GRPQUOTA]) | |
1017 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1018 | ||
1019 | if ((sbi->s_qf_names[USRQUOTA] && | |
1020 | (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) || | |
1021 | (sbi->s_qf_names[GRPQUOTA] && | |
1022 | (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) { | |
1023 | printk(KERN_ERR "EXT3-fs: old and new quota " | |
1024 | "format mixing.\n"); | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | if (!sbi->s_jquota_fmt) { | |
1029 | printk(KERN_ERR "EXT3-fs: journalled quota format " | |
1030 | "not specified.\n"); | |
1031 | return 0; | |
1032 | } | |
1033 | } else { | |
1034 | if (sbi->s_jquota_fmt) { | |
1035 | printk(KERN_ERR "EXT3-fs: journalled quota format " | |
1036 | "specified with no journalling " | |
1037 | "enabled.\n"); | |
1038 | return 0; | |
1039 | } | |
1da177e4 LT |
1040 | } |
1041 | #endif | |
1da177e4 LT |
1042 | return 1; |
1043 | } | |
1044 | ||
1045 | static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, | |
1046 | int read_only) | |
1047 | { | |
1048 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
1049 | int res = 0; | |
1050 | ||
1051 | if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { | |
1052 | printk (KERN_ERR "EXT3-fs warning: revision level too high, " | |
1053 | "forcing read-only mode\n"); | |
1054 | res = MS_RDONLY; | |
1055 | } | |
1056 | if (read_only) | |
1057 | return res; | |
1058 | if (!(sbi->s_mount_state & EXT3_VALID_FS)) | |
1059 | printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, " | |
1060 | "running e2fsck is recommended\n"); | |
1061 | else if ((sbi->s_mount_state & EXT3_ERROR_FS)) | |
1062 | printk (KERN_WARNING | |
1063 | "EXT3-fs warning: mounting fs with errors, " | |
1064 | "running e2fsck is recommended\n"); | |
1065 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1066 | le16_to_cpu(es->s_mnt_count) >= | |
1067 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1068 | printk (KERN_WARNING | |
1069 | "EXT3-fs warning: maximal mount count reached, " | |
1070 | "running e2fsck is recommended\n"); | |
1071 | else if (le32_to_cpu(es->s_checkinterval) && | |
1072 | (le32_to_cpu(es->s_lastcheck) + | |
1073 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1074 | printk (KERN_WARNING | |
1075 | "EXT3-fs warning: checktime reached, " | |
1076 | "running e2fsck is recommended\n"); | |
1077 | #if 0 | |
1078 | /* @@@ We _will_ want to clear the valid bit if we find | |
1079 | inconsistencies, to force a fsck at reboot. But for | |
1080 | a plain journaled filesystem we can keep it set as | |
1081 | valid forever! :) */ | |
1082 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS); | |
1083 | #endif | |
1084 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1085 | es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); | |
1086 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); | |
1087 | es->s_mtime = cpu_to_le32(get_seconds()); | |
1088 | ext3_update_dynamic_rev(sb); | |
1089 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
1090 | ||
1091 | ext3_commit_super(sb, es, 1); | |
1092 | if (test_opt(sb, DEBUG)) | |
1093 | printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, " | |
1094 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", | |
1095 | sb->s_blocksize, | |
1096 | sbi->s_groups_count, | |
1097 | EXT3_BLOCKS_PER_GROUP(sb), | |
1098 | EXT3_INODES_PER_GROUP(sb), | |
1099 | sbi->s_mount_opt); | |
1100 | ||
1101 | printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id); | |
1102 | if (EXT3_SB(sb)->s_journal->j_inode == NULL) { | |
1103 | char b[BDEVNAME_SIZE]; | |
1104 | ||
1105 | printk("external journal on %s\n", | |
1106 | bdevname(EXT3_SB(sb)->s_journal->j_dev, b)); | |
1107 | } else { | |
1108 | printk("internal journal\n"); | |
1109 | } | |
1110 | #ifdef CONFIG_EXT3_CHECK | |
1111 | if (test_opt (sb, CHECK)) { | |
1112 | ext3_check_blocks_bitmap (sb); | |
1113 | ext3_check_inodes_bitmap (sb); | |
1114 | } | |
1115 | #endif | |
1116 | return res; | |
1117 | } | |
1118 | ||
1119 | /* Called at mount-time, super-block is locked */ | |
1120 | static int ext3_check_descriptors (struct super_block * sb) | |
1121 | { | |
1122 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
1123 | unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1124 | struct ext3_group_desc * gdp = NULL; | |
1125 | int desc_block = 0; | |
1126 | int i; | |
1127 | ||
1128 | ext3_debug ("Checking group descriptors"); | |
1129 | ||
1130 | for (i = 0; i < sbi->s_groups_count; i++) | |
1131 | { | |
1132 | if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0) | |
1133 | gdp = (struct ext3_group_desc *) | |
1134 | sbi->s_group_desc[desc_block++]->b_data; | |
1135 | if (le32_to_cpu(gdp->bg_block_bitmap) < block || | |
1136 | le32_to_cpu(gdp->bg_block_bitmap) >= | |
1137 | block + EXT3_BLOCKS_PER_GROUP(sb)) | |
1138 | { | |
1139 | ext3_error (sb, "ext3_check_descriptors", | |
1140 | "Block bitmap for group %d" | |
1141 | " not in group (block %lu)!", | |
1142 | i, (unsigned long) | |
1143 | le32_to_cpu(gdp->bg_block_bitmap)); | |
1144 | return 0; | |
1145 | } | |
1146 | if (le32_to_cpu(gdp->bg_inode_bitmap) < block || | |
1147 | le32_to_cpu(gdp->bg_inode_bitmap) >= | |
1148 | block + EXT3_BLOCKS_PER_GROUP(sb)) | |
1149 | { | |
1150 | ext3_error (sb, "ext3_check_descriptors", | |
1151 | "Inode bitmap for group %d" | |
1152 | " not in group (block %lu)!", | |
1153 | i, (unsigned long) | |
1154 | le32_to_cpu(gdp->bg_inode_bitmap)); | |
1155 | return 0; | |
1156 | } | |
1157 | if (le32_to_cpu(gdp->bg_inode_table) < block || | |
1158 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= | |
1159 | block + EXT3_BLOCKS_PER_GROUP(sb)) | |
1160 | { | |
1161 | ext3_error (sb, "ext3_check_descriptors", | |
1162 | "Inode table for group %d" | |
1163 | " not in group (block %lu)!", | |
1164 | i, (unsigned long) | |
1165 | le32_to_cpu(gdp->bg_inode_table)); | |
1166 | return 0; | |
1167 | } | |
1168 | block += EXT3_BLOCKS_PER_GROUP(sb); | |
1169 | gdp++; | |
1170 | } | |
1171 | ||
1172 | sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); | |
1173 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb)); | |
1174 | return 1; | |
1175 | } | |
1176 | ||
1177 | ||
1178 | /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at | |
1179 | * the superblock) which were deleted from all directories, but held open by | |
1180 | * a process at the time of a crash. We walk the list and try to delete these | |
1181 | * inodes at recovery time (only with a read-write filesystem). | |
1182 | * | |
1183 | * In order to keep the orphan inode chain consistent during traversal (in | |
1184 | * case of crash during recovery), we link each inode into the superblock | |
1185 | * orphan list_head and handle it the same way as an inode deletion during | |
1186 | * normal operation (which journals the operations for us). | |
1187 | * | |
1188 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1189 | * accidentally point at an in-use or already deleted inode. The worst that | |
1190 | * can happen in this case is that we get a "bit already cleared" message from | |
1191 | * ext3_free_inode(). The only reason we would point at a wrong inode is if | |
1192 | * e2fsck was run on this filesystem, and it must have already done the orphan | |
1193 | * inode cleanup for us, so we can safely abort without any further action. | |
1194 | */ | |
1195 | static void ext3_orphan_cleanup (struct super_block * sb, | |
1196 | struct ext3_super_block * es) | |
1197 | { | |
1198 | unsigned int s_flags = sb->s_flags; | |
1199 | int nr_orphans = 0, nr_truncates = 0; | |
1200 | #ifdef CONFIG_QUOTA | |
1201 | int i; | |
1202 | #endif | |
1203 | if (!es->s_last_orphan) { | |
1204 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1205 | return; | |
1206 | } | |
1207 | ||
1208 | if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) { | |
1209 | if (es->s_last_orphan) | |
1210 | jbd_debug(1, "Errors on filesystem, " | |
1211 | "clearing orphan list.\n"); | |
1212 | es->s_last_orphan = 0; | |
1213 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1214 | return; | |
1215 | } | |
1216 | ||
1217 | if (s_flags & MS_RDONLY) { | |
1218 | printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n", | |
1219 | sb->s_id); | |
1220 | sb->s_flags &= ~MS_RDONLY; | |
1221 | } | |
1222 | #ifdef CONFIG_QUOTA | |
1223 | /* Needed for iput() to work correctly and not trash data */ | |
1224 | sb->s_flags |= MS_ACTIVE; | |
1225 | /* Turn on quotas so that they are updated correctly */ | |
1226 | for (i = 0; i < MAXQUOTAS; i++) { | |
1227 | if (EXT3_SB(sb)->s_qf_names[i]) { | |
1228 | int ret = ext3_quota_on_mount(sb, i); | |
1229 | if (ret < 0) | |
1230 | printk(KERN_ERR | |
1231 | "EXT3-fs: Cannot turn on journalled " | |
1232 | "quota: error %d\n", ret); | |
1233 | } | |
1234 | } | |
1235 | #endif | |
1236 | ||
1237 | while (es->s_last_orphan) { | |
1238 | struct inode *inode; | |
1239 | ||
1240 | if (!(inode = | |
1241 | ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { | |
1242 | es->s_last_orphan = 0; | |
1243 | break; | |
1244 | } | |
1245 | ||
1246 | list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); | |
1247 | DQUOT_INIT(inode); | |
1248 | if (inode->i_nlink) { | |
1249 | printk(KERN_DEBUG | |
1250 | "%s: truncating inode %ld to %Ld bytes\n", | |
1251 | __FUNCTION__, inode->i_ino, inode->i_size); | |
1252 | jbd_debug(2, "truncating inode %ld to %Ld bytes\n", | |
1253 | inode->i_ino, inode->i_size); | |
1254 | ext3_truncate(inode); | |
1255 | nr_truncates++; | |
1256 | } else { | |
1257 | printk(KERN_DEBUG | |
1258 | "%s: deleting unreferenced inode %ld\n", | |
1259 | __FUNCTION__, inode->i_ino); | |
1260 | jbd_debug(2, "deleting unreferenced inode %ld\n", | |
1261 | inode->i_ino); | |
1262 | nr_orphans++; | |
1263 | } | |
1264 | iput(inode); /* The delete magic happens here! */ | |
1265 | } | |
1266 | ||
1267 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1268 | ||
1269 | if (nr_orphans) | |
1270 | printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n", | |
1271 | sb->s_id, PLURAL(nr_orphans)); | |
1272 | if (nr_truncates) | |
1273 | printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n", | |
1274 | sb->s_id, PLURAL(nr_truncates)); | |
1275 | #ifdef CONFIG_QUOTA | |
1276 | /* Turn quotas off */ | |
1277 | for (i = 0; i < MAXQUOTAS; i++) { | |
1278 | if (sb_dqopt(sb)->files[i]) | |
1279 | vfs_quota_off(sb, i); | |
1280 | } | |
1281 | #endif | |
1282 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1283 | } | |
1284 | ||
1285 | #define log2(n) ffz(~(n)) | |
1286 | ||
1287 | /* | |
1288 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
1289 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
1290 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
1291 | */ | |
1292 | static loff_t ext3_max_size(int bits) | |
1293 | { | |
1294 | loff_t res = EXT3_NDIR_BLOCKS; | |
1295 | /* This constant is calculated to be the largest file size for a | |
1296 | * dense, 4k-blocksize file such that the total number of | |
1297 | * sectors in the file, including data and all indirect blocks, | |
1298 | * does not exceed 2^32. */ | |
1299 | const loff_t upper_limit = 0x1ff7fffd000LL; | |
1300 | ||
1301 | res += 1LL << (bits-2); | |
1302 | res += 1LL << (2*(bits-2)); | |
1303 | res += 1LL << (3*(bits-2)); | |
1304 | res <<= bits; | |
1305 | if (res > upper_limit) | |
1306 | res = upper_limit; | |
1307 | return res; | |
1308 | } | |
1309 | ||
1310 | static unsigned long descriptor_loc(struct super_block *sb, | |
1311 | unsigned long logic_sb_block, | |
1312 | int nr) | |
1313 | { | |
1314 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
1315 | unsigned long bg, first_data_block, first_meta_bg; | |
1316 | int has_super = 0; | |
1317 | ||
1318 | first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1319 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1320 | ||
1321 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || | |
1322 | nr < first_meta_bg) | |
1323 | return (logic_sb_block + nr + 1); | |
1324 | bg = sbi->s_desc_per_block * nr; | |
1325 | if (ext3_bg_has_super(sb, bg)) | |
1326 | has_super = 1; | |
1327 | return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); | |
1328 | } | |
1329 | ||
1330 | ||
1331 | static int ext3_fill_super (struct super_block *sb, void *data, int silent) | |
1332 | { | |
1333 | struct buffer_head * bh; | |
1334 | struct ext3_super_block *es = NULL; | |
1335 | struct ext3_sb_info *sbi; | |
1336 | unsigned long block; | |
1337 | unsigned long sb_block = get_sb_block(&data); | |
1338 | unsigned long logic_sb_block; | |
1339 | unsigned long offset = 0; | |
1340 | unsigned long journal_inum = 0; | |
1341 | unsigned long def_mount_opts; | |
1342 | struct inode *root; | |
1343 | int blocksize; | |
1344 | int hblock; | |
1345 | int db_count; | |
1346 | int i; | |
1347 | int needs_recovery; | |
1348 | __le32 features; | |
1349 | ||
1350 | sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); | |
1351 | if (!sbi) | |
1352 | return -ENOMEM; | |
1353 | sb->s_fs_info = sbi; | |
1354 | memset(sbi, 0, sizeof(*sbi)); | |
1355 | sbi->s_mount_opt = 0; | |
1356 | sbi->s_resuid = EXT3_DEF_RESUID; | |
1357 | sbi->s_resgid = EXT3_DEF_RESGID; | |
1358 | ||
1359 | unlock_kernel(); | |
1360 | ||
1361 | blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); | |
1362 | if (!blocksize) { | |
1363 | printk(KERN_ERR "EXT3-fs: unable to set blocksize\n"); | |
1364 | goto out_fail; | |
1365 | } | |
1366 | ||
1367 | /* | |
1368 | * The ext3 superblock will not be buffer aligned for other than 1kB | |
1369 | * block sizes. We need to calculate the offset from buffer start. | |
1370 | */ | |
1371 | if (blocksize != EXT3_MIN_BLOCK_SIZE) { | |
1372 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; | |
1373 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; | |
1374 | } else { | |
1375 | logic_sb_block = sb_block; | |
1376 | } | |
1377 | ||
1378 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
1379 | printk (KERN_ERR "EXT3-fs: unable to read superblock\n"); | |
1380 | goto out_fail; | |
1381 | } | |
1382 | /* | |
1383 | * Note: s_es must be initialized as soon as possible because | |
1384 | * some ext3 macro-instructions depend on its value | |
1385 | */ | |
1386 | es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); | |
1387 | sbi->s_es = es; | |
1388 | sb->s_magic = le16_to_cpu(es->s_magic); | |
1389 | if (sb->s_magic != EXT3_SUPER_MAGIC) | |
1390 | goto cantfind_ext3; | |
1391 | ||
1392 | /* Set defaults before we parse the mount options */ | |
1393 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
1394 | if (def_mount_opts & EXT3_DEFM_DEBUG) | |
1395 | set_opt(sbi->s_mount_opt, DEBUG); | |
1396 | if (def_mount_opts & EXT3_DEFM_BSDGROUPS) | |
1397 | set_opt(sbi->s_mount_opt, GRPID); | |
1398 | if (def_mount_opts & EXT3_DEFM_UID16) | |
1399 | set_opt(sbi->s_mount_opt, NO_UID32); | |
1400 | if (def_mount_opts & EXT3_DEFM_XATTR_USER) | |
1401 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
1402 | if (def_mount_opts & EXT3_DEFM_ACL) | |
1403 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
1404 | if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) | |
1405 | sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA; | |
1406 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) | |
1407 | sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA; | |
1408 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) | |
1409 | sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA; | |
1410 | ||
1411 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) | |
1412 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1413 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO) | |
1414 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1415 | ||
1416 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1417 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1418 | ||
1419 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1420 | ||
1421 | if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0)) | |
1422 | goto failed_mount; | |
1423 | ||
1424 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1425 | ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1426 | ||
1427 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && | |
1428 | (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1429 | EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1430 | EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
1431 | printk(KERN_WARNING | |
1432 | "EXT3-fs warning: feature flags set on rev 0 fs, " | |
1433 | "running e2fsck is recommended\n"); | |
1434 | /* | |
1435 | * Check feature flags regardless of the revision level, since we | |
1436 | * previously didn't change the revision level when setting the flags, | |
1437 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1438 | */ | |
1439 | features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP); | |
1440 | if (features) { | |
1441 | printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of " | |
1442 | "unsupported optional features (%x).\n", | |
1443 | sb->s_id, le32_to_cpu(features)); | |
1444 | goto failed_mount; | |
1445 | } | |
1446 | features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP); | |
1447 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
1448 | printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of " | |
1449 | "unsupported optional features (%x).\n", | |
1450 | sb->s_id, le32_to_cpu(features)); | |
1451 | goto failed_mount; | |
1452 | } | |
1453 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
1454 | ||
1455 | if (blocksize < EXT3_MIN_BLOCK_SIZE || | |
1456 | blocksize > EXT3_MAX_BLOCK_SIZE) { | |
1457 | printk(KERN_ERR | |
1458 | "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n", | |
1459 | blocksize, sb->s_id); | |
1460 | goto failed_mount; | |
1461 | } | |
1462 | ||
1463 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1464 | if (sb->s_blocksize != blocksize) { | |
1465 | /* | |
1466 | * Make sure the blocksize for the filesystem is larger | |
1467 | * than the hardware sectorsize for the machine. | |
1468 | */ | |
1469 | if (blocksize < hblock) { | |
1470 | printk(KERN_ERR "EXT3-fs: blocksize %d too small for " | |
1471 | "device blocksize %d.\n", blocksize, hblock); | |
1472 | goto failed_mount; | |
1473 | } | |
1474 | ||
1475 | brelse (bh); | |
1476 | sb_set_blocksize(sb, blocksize); | |
1477 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; | |
1478 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; | |
1479 | bh = sb_bread(sb, logic_sb_block); | |
1480 | if (!bh) { | |
1481 | printk(KERN_ERR | |
1482 | "EXT3-fs: Can't read superblock on 2nd try.\n"); | |
1483 | goto failed_mount; | |
1484 | } | |
1485 | es = (struct ext3_super_block *)(((char *)bh->b_data) + offset); | |
1486 | sbi->s_es = es; | |
1487 | if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) { | |
1488 | printk (KERN_ERR | |
1489 | "EXT3-fs: Magic mismatch, very weird !\n"); | |
1490 | goto failed_mount; | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); | |
1495 | ||
1496 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { | |
1497 | sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; | |
1498 | sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO; | |
1499 | } else { | |
1500 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1501 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
1502 | if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) || | |
1503 | (sbi->s_inode_size & (sbi->s_inode_size - 1)) || | |
1504 | (sbi->s_inode_size > blocksize)) { | |
1505 | printk (KERN_ERR | |
1506 | "EXT3-fs: unsupported inode size: %d\n", | |
1507 | sbi->s_inode_size); | |
1508 | goto failed_mount; | |
1509 | } | |
1510 | } | |
1511 | sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << | |
1512 | le32_to_cpu(es->s_log_frag_size); | |
1513 | if (blocksize != sbi->s_frag_size) { | |
1514 | printk(KERN_ERR | |
1515 | "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n", | |
1516 | sbi->s_frag_size, blocksize); | |
1517 | goto failed_mount; | |
1518 | } | |
1519 | sbi->s_frags_per_block = 1; | |
1520 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1521 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1522 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
1523 | if (EXT3_INODE_SIZE(sb) == 0) | |
1524 | goto cantfind_ext3; | |
1525 | sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); | |
1526 | if (sbi->s_inodes_per_block == 0) | |
1527 | goto cantfind_ext3; | |
1528 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
1529 | sbi->s_inodes_per_block; | |
1530 | sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); | |
1531 | sbi->s_sbh = bh; | |
1532 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1533 | sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb)); | |
1534 | sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb)); | |
1535 | for (i=0; i < 4; i++) | |
1536 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1537 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1538 | ||
1539 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1540 | printk (KERN_ERR | |
1541 | "EXT3-fs: #blocks per group too big: %lu\n", | |
1542 | sbi->s_blocks_per_group); | |
1543 | goto failed_mount; | |
1544 | } | |
1545 | if (sbi->s_frags_per_group > blocksize * 8) { | |
1546 | printk (KERN_ERR | |
1547 | "EXT3-fs: #fragments per group too big: %lu\n", | |
1548 | sbi->s_frags_per_group); | |
1549 | goto failed_mount; | |
1550 | } | |
1551 | if (sbi->s_inodes_per_group > blocksize * 8) { | |
1552 | printk (KERN_ERR | |
1553 | "EXT3-fs: #inodes per group too big: %lu\n", | |
1554 | sbi->s_inodes_per_group); | |
1555 | goto failed_mount; | |
1556 | } | |
1557 | ||
1558 | if (EXT3_BLOCKS_PER_GROUP(sb) == 0) | |
1559 | goto cantfind_ext3; | |
1560 | sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - | |
1561 | le32_to_cpu(es->s_first_data_block) + | |
1562 | EXT3_BLOCKS_PER_GROUP(sb) - 1) / | |
1563 | EXT3_BLOCKS_PER_GROUP(sb); | |
1564 | db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) / | |
1565 | EXT3_DESC_PER_BLOCK(sb); | |
1566 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), | |
1567 | GFP_KERNEL); | |
1568 | if (sbi->s_group_desc == NULL) { | |
1569 | printk (KERN_ERR "EXT3-fs: not enough memory\n"); | |
1570 | goto failed_mount; | |
1571 | } | |
1572 | ||
1573 | percpu_counter_init(&sbi->s_freeblocks_counter); | |
1574 | percpu_counter_init(&sbi->s_freeinodes_counter); | |
1575 | percpu_counter_init(&sbi->s_dirs_counter); | |
1576 | bgl_lock_init(&sbi->s_blockgroup_lock); | |
1577 | ||
1578 | for (i = 0; i < db_count; i++) { | |
1579 | block = descriptor_loc(sb, logic_sb_block, i); | |
1580 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1581 | if (!sbi->s_group_desc[i]) { | |
1582 | printk (KERN_ERR "EXT3-fs: " | |
1583 | "can't read group descriptor %d\n", i); | |
1584 | db_count = i; | |
1585 | goto failed_mount2; | |
1586 | } | |
1587 | } | |
1588 | if (!ext3_check_descriptors (sb)) { | |
1589 | printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n"); | |
1590 | goto failed_mount2; | |
1591 | } | |
1592 | sbi->s_gdb_count = db_count; | |
1593 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1594 | spin_lock_init(&sbi->s_next_gen_lock); | |
1595 | /* per fileystem reservation list head & lock */ | |
1596 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1597 | sbi->s_rsv_window_root = RB_ROOT; | |
1598 | /* Add a single, static dummy reservation to the start of the | |
1599 | * reservation window list --- it gives us a placeholder for | |
1600 | * append-at-start-of-list which makes the allocation logic | |
1601 | * _much_ simpler. */ | |
1602 | sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; | |
1603 | sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; | |
1604 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1605 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1606 | ext3_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1607 | ||
1608 | /* | |
1609 | * set up enough so that it can read an inode | |
1610 | */ | |
1611 | sb->s_op = &ext3_sops; | |
1612 | sb->s_export_op = &ext3_export_ops; | |
1613 | sb->s_xattr = ext3_xattr_handlers; | |
1614 | #ifdef CONFIG_QUOTA | |
1615 | sb->s_qcop = &ext3_qctl_operations; | |
1616 | sb->dq_op = &ext3_quota_operations; | |
1617 | #endif | |
1618 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
1619 | ||
1620 | sb->s_root = NULL; | |
1621 | ||
1622 | needs_recovery = (es->s_last_orphan != 0 || | |
1623 | EXT3_HAS_INCOMPAT_FEATURE(sb, | |
1624 | EXT3_FEATURE_INCOMPAT_RECOVER)); | |
1625 | ||
1626 | /* | |
1627 | * The first inode we look at is the journal inode. Don't try | |
1628 | * root first: it may be modified in the journal! | |
1629 | */ | |
1630 | if (!test_opt(sb, NOLOAD) && | |
1631 | EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { | |
1632 | if (ext3_load_journal(sb, es)) | |
1633 | goto failed_mount2; | |
1634 | } else if (journal_inum) { | |
1635 | if (ext3_create_journal(sb, es, journal_inum)) | |
1636 | goto failed_mount2; | |
1637 | } else { | |
1638 | if (!silent) | |
1639 | printk (KERN_ERR | |
1640 | "ext3: No journal on filesystem on %s\n", | |
1641 | sb->s_id); | |
1642 | goto failed_mount2; | |
1643 | } | |
1644 | ||
1645 | /* We have now updated the journal if required, so we can | |
1646 | * validate the data journaling mode. */ | |
1647 | switch (test_opt(sb, DATA_FLAGS)) { | |
1648 | case 0: | |
1649 | /* No mode set, assume a default based on the journal | |
1650 | capabilities: ORDERED_DATA if the journal can | |
1651 | cope, else JOURNAL_DATA */ | |
1652 | if (journal_check_available_features | |
1653 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) | |
1654 | set_opt(sbi->s_mount_opt, ORDERED_DATA); | |
1655 | else | |
1656 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
1657 | break; | |
1658 | ||
1659 | case EXT3_MOUNT_ORDERED_DATA: | |
1660 | case EXT3_MOUNT_WRITEBACK_DATA: | |
1661 | if (!journal_check_available_features | |
1662 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { | |
1663 | printk(KERN_ERR "EXT3-fs: Journal does not support " | |
1664 | "requested data journaling mode\n"); | |
1665 | goto failed_mount3; | |
1666 | } | |
1667 | default: | |
1668 | break; | |
1669 | } | |
1670 | ||
1671 | if (test_opt(sb, NOBH)) { | |
1672 | if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) { | |
1673 | printk(KERN_WARNING "EXT3-fs: Ignoring nobh option " | |
1674 | "since filesystem blocksize doesn't match " | |
1675 | "pagesize\n"); | |
1676 | clear_opt(sbi->s_mount_opt, NOBH); | |
1677 | } | |
1678 | if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) { | |
1679 | printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - " | |
1680 | "its supported only with writeback mode\n"); | |
1681 | clear_opt(sbi->s_mount_opt, NOBH); | |
1682 | } | |
1683 | } | |
1684 | /* | |
1685 | * The journal_load will have done any necessary log recovery, | |
1686 | * so we can safely mount the rest of the filesystem now. | |
1687 | */ | |
1688 | ||
1689 | root = iget(sb, EXT3_ROOT_INO); | |
1690 | sb->s_root = d_alloc_root(root); | |
1691 | if (!sb->s_root) { | |
1692 | printk(KERN_ERR "EXT3-fs: get root inode failed\n"); | |
1693 | iput(root); | |
1694 | goto failed_mount3; | |
1695 | } | |
1696 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1697 | dput(sb->s_root); | |
1698 | sb->s_root = NULL; | |
1699 | printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n"); | |
1700 | goto failed_mount3; | |
1701 | } | |
1702 | ||
1703 | ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY); | |
1704 | /* | |
1705 | * akpm: core read_super() calls in here with the superblock locked. | |
1706 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
1707 | * in numerous places. Here we just pop the lock - it's relatively | |
1708 | * harmless, because we are now ready to accept write_super() requests, | |
1709 | * and aviro says that's the only reason for hanging onto the | |
1710 | * superblock lock. | |
1711 | */ | |
1712 | EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; | |
1713 | ext3_orphan_cleanup(sb, es); | |
1714 | EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; | |
1715 | if (needs_recovery) | |
1716 | printk (KERN_INFO "EXT3-fs: recovery complete.\n"); | |
1717 | ext3_mark_recovery_complete(sb, es); | |
1718 | printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n", | |
1719 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": | |
1720 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": | |
1721 | "writeback"); | |
1722 | ||
1723 | percpu_counter_mod(&sbi->s_freeblocks_counter, | |
1724 | ext3_count_free_blocks(sb)); | |
1725 | percpu_counter_mod(&sbi->s_freeinodes_counter, | |
1726 | ext3_count_free_inodes(sb)); | |
1727 | percpu_counter_mod(&sbi->s_dirs_counter, | |
1728 | ext3_count_dirs(sb)); | |
1729 | ||
1730 | lock_kernel(); | |
1731 | return 0; | |
1732 | ||
1733 | cantfind_ext3: | |
1734 | if (!silent) | |
1735 | printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n", | |
1736 | sb->s_id); | |
1737 | goto failed_mount; | |
1738 | ||
1739 | failed_mount3: | |
1740 | journal_destroy(sbi->s_journal); | |
1741 | failed_mount2: | |
1742 | for (i = 0; i < db_count; i++) | |
1743 | brelse(sbi->s_group_desc[i]); | |
1744 | kfree(sbi->s_group_desc); | |
1745 | failed_mount: | |
1746 | #ifdef CONFIG_QUOTA | |
1747 | for (i = 0; i < MAXQUOTAS; i++) | |
1748 | kfree(sbi->s_qf_names[i]); | |
1749 | #endif | |
1750 | ext3_blkdev_remove(sbi); | |
1751 | brelse(bh); | |
1752 | out_fail: | |
1753 | sb->s_fs_info = NULL; | |
1754 | kfree(sbi); | |
1755 | lock_kernel(); | |
1756 | return -EINVAL; | |
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * Setup any per-fs journal parameters now. We'll do this both on | |
1761 | * initial mount, once the journal has been initialised but before we've | |
1762 | * done any recovery; and again on any subsequent remount. | |
1763 | */ | |
1764 | static void ext3_init_journal_params(struct super_block *sb, journal_t *journal) | |
1765 | { | |
1766 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
1767 | ||
1768 | if (sbi->s_commit_interval) | |
1769 | journal->j_commit_interval = sbi->s_commit_interval; | |
1770 | /* We could also set up an ext3-specific default for the commit | |
1771 | * interval here, but for now we'll just fall back to the jbd | |
1772 | * default. */ | |
1773 | ||
1774 | spin_lock(&journal->j_state_lock); | |
1775 | if (test_opt(sb, BARRIER)) | |
1776 | journal->j_flags |= JFS_BARRIER; | |
1777 | else | |
1778 | journal->j_flags &= ~JFS_BARRIER; | |
1779 | spin_unlock(&journal->j_state_lock); | |
1780 | } | |
1781 | ||
1782 | static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum) | |
1783 | { | |
1784 | struct inode *journal_inode; | |
1785 | journal_t *journal; | |
1786 | ||
1787 | /* First, test for the existence of a valid inode on disk. Bad | |
1788 | * things happen if we iget() an unused inode, as the subsequent | |
1789 | * iput() will try to delete it. */ | |
1790 | ||
1791 | journal_inode = iget(sb, journal_inum); | |
1792 | if (!journal_inode) { | |
1793 | printk(KERN_ERR "EXT3-fs: no journal found.\n"); | |
1794 | return NULL; | |
1795 | } | |
1796 | if (!journal_inode->i_nlink) { | |
1797 | make_bad_inode(journal_inode); | |
1798 | iput(journal_inode); | |
1799 | printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n"); | |
1800 | return NULL; | |
1801 | } | |
1802 | ||
1803 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
1804 | journal_inode, journal_inode->i_size); | |
1805 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
1806 | printk(KERN_ERR "EXT3-fs: invalid journal inode.\n"); | |
1807 | iput(journal_inode); | |
1808 | return NULL; | |
1809 | } | |
1810 | ||
1811 | journal = journal_init_inode(journal_inode); | |
1812 | if (!journal) { | |
1813 | printk(KERN_ERR "EXT3-fs: Could not load journal inode\n"); | |
1814 | iput(journal_inode); | |
1815 | return NULL; | |
1816 | } | |
1817 | journal->j_private = sb; | |
1818 | ext3_init_journal_params(sb, journal); | |
1819 | return journal; | |
1820 | } | |
1821 | ||
1822 | static journal_t *ext3_get_dev_journal(struct super_block *sb, | |
1823 | dev_t j_dev) | |
1824 | { | |
1825 | struct buffer_head * bh; | |
1826 | journal_t *journal; | |
1827 | int start; | |
1828 | int len; | |
1829 | int hblock, blocksize; | |
1830 | unsigned long sb_block; | |
1831 | unsigned long offset; | |
1832 | struct ext3_super_block * es; | |
1833 | struct block_device *bdev; | |
1834 | ||
1835 | bdev = ext3_blkdev_get(j_dev); | |
1836 | if (bdev == NULL) | |
1837 | return NULL; | |
1838 | ||
1839 | if (bd_claim(bdev, sb)) { | |
1840 | printk(KERN_ERR | |
1841 | "EXT3: failed to claim external journal device.\n"); | |
1842 | blkdev_put(bdev); | |
1843 | return NULL; | |
1844 | } | |
1845 | ||
1846 | blocksize = sb->s_blocksize; | |
1847 | hblock = bdev_hardsect_size(bdev); | |
1848 | if (blocksize < hblock) { | |
1849 | printk(KERN_ERR | |
1850 | "EXT3-fs: blocksize too small for journal device.\n"); | |
1851 | goto out_bdev; | |
1852 | } | |
1853 | ||
1854 | sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; | |
1855 | offset = EXT3_MIN_BLOCK_SIZE % blocksize; | |
1856 | set_blocksize(bdev, blocksize); | |
1857 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
1858 | printk(KERN_ERR "EXT3-fs: couldn't read superblock of " | |
1859 | "external journal\n"); | |
1860 | goto out_bdev; | |
1861 | } | |
1862 | ||
1863 | es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); | |
1864 | if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || | |
1865 | !(le32_to_cpu(es->s_feature_incompat) & | |
1866 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { | |
1867 | printk(KERN_ERR "EXT3-fs: external journal has " | |
1868 | "bad superblock\n"); | |
1869 | brelse(bh); | |
1870 | goto out_bdev; | |
1871 | } | |
1872 | ||
1873 | if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { | |
1874 | printk(KERN_ERR "EXT3-fs: journal UUID does not match\n"); | |
1875 | brelse(bh); | |
1876 | goto out_bdev; | |
1877 | } | |
1878 | ||
1879 | len = le32_to_cpu(es->s_blocks_count); | |
1880 | start = sb_block + 1; | |
1881 | brelse(bh); /* we're done with the superblock */ | |
1882 | ||
1883 | journal = journal_init_dev(bdev, sb->s_bdev, | |
1884 | start, len, blocksize); | |
1885 | if (!journal) { | |
1886 | printk(KERN_ERR "EXT3-fs: failed to create device journal\n"); | |
1887 | goto out_bdev; | |
1888 | } | |
1889 | journal->j_private = sb; | |
1890 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
1891 | wait_on_buffer(journal->j_sb_buffer); | |
1892 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
1893 | printk(KERN_ERR "EXT3-fs: I/O error on journal device\n"); | |
1894 | goto out_journal; | |
1895 | } | |
1896 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
1897 | printk(KERN_ERR "EXT3-fs: External journal has more than one " | |
1898 | "user (unsupported) - %d\n", | |
1899 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
1900 | goto out_journal; | |
1901 | } | |
1902 | EXT3_SB(sb)->journal_bdev = bdev; | |
1903 | ext3_init_journal_params(sb, journal); | |
1904 | return journal; | |
1905 | out_journal: | |
1906 | journal_destroy(journal); | |
1907 | out_bdev: | |
1908 | ext3_blkdev_put(bdev); | |
1909 | return NULL; | |
1910 | } | |
1911 | ||
1912 | static int ext3_load_journal(struct super_block * sb, | |
1913 | struct ext3_super_block * es) | |
1914 | { | |
1915 | journal_t *journal; | |
1916 | int journal_inum = le32_to_cpu(es->s_journal_inum); | |
1917 | dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
1918 | int err = 0; | |
1919 | int really_read_only; | |
1920 | ||
1921 | really_read_only = bdev_read_only(sb->s_bdev); | |
1922 | ||
1923 | /* | |
1924 | * Are we loading a blank journal or performing recovery after a | |
1925 | * crash? For recovery, we need to check in advance whether we | |
1926 | * can get read-write access to the device. | |
1927 | */ | |
1928 | ||
1929 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { | |
1930 | if (sb->s_flags & MS_RDONLY) { | |
1931 | printk(KERN_INFO "EXT3-fs: INFO: recovery " | |
1932 | "required on readonly filesystem.\n"); | |
1933 | if (really_read_only) { | |
1934 | printk(KERN_ERR "EXT3-fs: write access " | |
1935 | "unavailable, cannot proceed.\n"); | |
1936 | return -EROFS; | |
1937 | } | |
1938 | printk (KERN_INFO "EXT3-fs: write access will " | |
1939 | "be enabled during recovery.\n"); | |
1940 | } | |
1941 | } | |
1942 | ||
1943 | if (journal_inum && journal_dev) { | |
1944 | printk(KERN_ERR "EXT3-fs: filesystem has both journal " | |
1945 | "and inode journals!\n"); | |
1946 | return -EINVAL; | |
1947 | } | |
1948 | ||
1949 | if (journal_inum) { | |
1950 | if (!(journal = ext3_get_journal(sb, journal_inum))) | |
1951 | return -EINVAL; | |
1952 | } else { | |
1953 | if (!(journal = ext3_get_dev_journal(sb, journal_dev))) | |
1954 | return -EINVAL; | |
1955 | } | |
1956 | ||
1957 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
1958 | err = journal_update_format(journal); | |
1959 | if (err) { | |
1960 | printk(KERN_ERR "EXT3-fs: error updating journal.\n"); | |
1961 | journal_destroy(journal); | |
1962 | return err; | |
1963 | } | |
1964 | } | |
1965 | ||
1966 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) | |
1967 | err = journal_wipe(journal, !really_read_only); | |
1968 | if (!err) | |
1969 | err = journal_load(journal); | |
1970 | ||
1971 | if (err) { | |
1972 | printk(KERN_ERR "EXT3-fs: error loading journal.\n"); | |
1973 | journal_destroy(journal); | |
1974 | return err; | |
1975 | } | |
1976 | ||
1977 | EXT3_SB(sb)->s_journal = journal; | |
1978 | ext3_clear_journal_err(sb, es); | |
1979 | return 0; | |
1980 | } | |
1981 | ||
1982 | static int ext3_create_journal(struct super_block * sb, | |
1983 | struct ext3_super_block * es, | |
1984 | int journal_inum) | |
1985 | { | |
1986 | journal_t *journal; | |
1987 | ||
1988 | if (sb->s_flags & MS_RDONLY) { | |
1989 | printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to " | |
1990 | "create journal.\n"); | |
1991 | return -EROFS; | |
1992 | } | |
1993 | ||
1994 | if (!(journal = ext3_get_journal(sb, journal_inum))) | |
1995 | return -EINVAL; | |
1996 | ||
1997 | printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n", | |
1998 | journal_inum); | |
1999 | ||
2000 | if (journal_create(journal)) { | |
2001 | printk(KERN_ERR "EXT3-fs: error creating journal.\n"); | |
2002 | journal_destroy(journal); | |
2003 | return -EIO; | |
2004 | } | |
2005 | ||
2006 | EXT3_SB(sb)->s_journal = journal; | |
2007 | ||
2008 | ext3_update_dynamic_rev(sb); | |
2009 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2010 | EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); | |
2011 | ||
2012 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2013 | sb->s_dirt = 1; | |
2014 | ||
2015 | /* Make sure we flush the recovery flag to disk. */ | |
2016 | ext3_commit_super(sb, es, 1); | |
2017 | ||
2018 | return 0; | |
2019 | } | |
2020 | ||
2021 | static void ext3_commit_super (struct super_block * sb, | |
2022 | struct ext3_super_block * es, | |
2023 | int sync) | |
2024 | { | |
2025 | struct buffer_head *sbh = EXT3_SB(sb)->s_sbh; | |
2026 | ||
2027 | if (!sbh) | |
2028 | return; | |
2029 | es->s_wtime = cpu_to_le32(get_seconds()); | |
2030 | es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); | |
2031 | es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); | |
2032 | BUFFER_TRACE(sbh, "marking dirty"); | |
2033 | mark_buffer_dirty(sbh); | |
2034 | if (sync) | |
2035 | sync_dirty_buffer(sbh); | |
2036 | } | |
2037 | ||
2038 | ||
2039 | /* | |
2040 | * Have we just finished recovery? If so, and if we are mounting (or | |
2041 | * remounting) the filesystem readonly, then we will end up with a | |
2042 | * consistent fs on disk. Record that fact. | |
2043 | */ | |
2044 | static void ext3_mark_recovery_complete(struct super_block * sb, | |
2045 | struct ext3_super_block * es) | |
2046 | { | |
2047 | journal_t *journal = EXT3_SB(sb)->s_journal; | |
2048 | ||
2049 | journal_lock_updates(journal); | |
2050 | journal_flush(journal); | |
2051 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && | |
2052 | sb->s_flags & MS_RDONLY) { | |
2053 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2054 | sb->s_dirt = 0; | |
2055 | ext3_commit_super(sb, es, 1); | |
2056 | } | |
2057 | journal_unlock_updates(journal); | |
2058 | } | |
2059 | ||
2060 | /* | |
2061 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2062 | * has recorded an error from a previous lifetime, move that error to the | |
2063 | * main filesystem now. | |
2064 | */ | |
2065 | static void ext3_clear_journal_err(struct super_block * sb, | |
2066 | struct ext3_super_block * es) | |
2067 | { | |
2068 | journal_t *journal; | |
2069 | int j_errno; | |
2070 | const char *errstr; | |
2071 | ||
2072 | journal = EXT3_SB(sb)->s_journal; | |
2073 | ||
2074 | /* | |
2075 | * Now check for any error status which may have been recorded in the | |
2076 | * journal by a prior ext3_error() or ext3_abort() | |
2077 | */ | |
2078 | ||
2079 | j_errno = journal_errno(journal); | |
2080 | if (j_errno) { | |
2081 | char nbuf[16]; | |
2082 | ||
2083 | errstr = ext3_decode_error(sb, j_errno, nbuf); | |
2084 | ext3_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
2085 | "from previous mount: %s", errstr); | |
2086 | ext3_warning(sb, __FUNCTION__, "Marking fs in need of " | |
2087 | "filesystem check."); | |
2088 | ||
2089 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | |
2090 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); | |
2091 | ext3_commit_super (sb, es, 1); | |
2092 | ||
2093 | journal_clear_err(journal); | |
2094 | } | |
2095 | } | |
2096 | ||
2097 | /* | |
2098 | * Force the running and committing transactions to commit, | |
2099 | * and wait on the commit. | |
2100 | */ | |
2101 | int ext3_force_commit(struct super_block *sb) | |
2102 | { | |
2103 | journal_t *journal; | |
2104 | int ret; | |
2105 | ||
2106 | if (sb->s_flags & MS_RDONLY) | |
2107 | return 0; | |
2108 | ||
2109 | journal = EXT3_SB(sb)->s_journal; | |
2110 | sb->s_dirt = 0; | |
2111 | ret = ext3_journal_force_commit(journal); | |
2112 | return ret; | |
2113 | } | |
2114 | ||
2115 | /* | |
2116 | * Ext3 always journals updates to the superblock itself, so we don't | |
2117 | * have to propagate any other updates to the superblock on disk at this | |
2118 | * point. Just start an async writeback to get the buffers on their way | |
2119 | * to the disk. | |
2120 | * | |
2121 | * This implicitly triggers the writebehind on sync(). | |
2122 | */ | |
2123 | ||
2124 | static void ext3_write_super (struct super_block * sb) | |
2125 | { | |
2126 | if (down_trylock(&sb->s_lock) == 0) | |
2127 | BUG(); | |
2128 | sb->s_dirt = 0; | |
2129 | } | |
2130 | ||
2131 | static int ext3_sync_fs(struct super_block *sb, int wait) | |
2132 | { | |
2133 | tid_t target; | |
2134 | ||
2135 | sb->s_dirt = 0; | |
2136 | if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) { | |
2137 | if (wait) | |
2138 | log_wait_commit(EXT3_SB(sb)->s_journal, target); | |
2139 | } | |
2140 | return 0; | |
2141 | } | |
2142 | ||
2143 | /* | |
2144 | * LVM calls this function before a (read-only) snapshot is created. This | |
2145 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2146 | */ | |
2147 | static void ext3_write_super_lockfs(struct super_block *sb) | |
2148 | { | |
2149 | sb->s_dirt = 0; | |
2150 | ||
2151 | if (!(sb->s_flags & MS_RDONLY)) { | |
2152 | journal_t *journal = EXT3_SB(sb)->s_journal; | |
2153 | ||
2154 | /* Now we set up the journal barrier. */ | |
2155 | journal_lock_updates(journal); | |
2156 | journal_flush(journal); | |
2157 | ||
2158 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
2159 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2160 | ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); | |
2161 | } | |
2162 | } | |
2163 | ||
2164 | /* | |
2165 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2166 | * flag here, even though the filesystem is not technically dirty yet. | |
2167 | */ | |
2168 | static void ext3_unlockfs(struct super_block *sb) | |
2169 | { | |
2170 | if (!(sb->s_flags & MS_RDONLY)) { | |
2171 | lock_super(sb); | |
2172 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
2173 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2174 | ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); | |
2175 | unlock_super(sb); | |
2176 | journal_unlock_updates(EXT3_SB(sb)->s_journal); | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | static int ext3_remount (struct super_block * sb, int * flags, char * data) | |
2181 | { | |
2182 | struct ext3_super_block * es; | |
2183 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
1da177e4 | 2184 | unsigned long n_blocks_count = 0; |
08c6a96f JK |
2185 | unsigned long old_sb_flags; |
2186 | struct ext3_mount_options old_opts; | |
2187 | int err; | |
2188 | #ifdef CONFIG_QUOTA | |
2189 | int i; | |
2190 | #endif | |
2191 | ||
2192 | /* Store the original options */ | |
2193 | old_sb_flags = sb->s_flags; | |
2194 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2195 | old_opts.s_resuid = sbi->s_resuid; | |
2196 | old_opts.s_resgid = sbi->s_resgid; | |
2197 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2198 | #ifdef CONFIG_QUOTA | |
2199 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2200 | for (i = 0; i < MAXQUOTAS; i++) | |
2201 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2202 | #endif | |
1da177e4 LT |
2203 | |
2204 | /* | |
2205 | * Allow the "check" option to be passed as a remount option. | |
2206 | */ | |
08c6a96f JK |
2207 | if (!parse_options(data, sb, NULL, &n_blocks_count, 1)) { |
2208 | err = -EINVAL; | |
2209 | goto restore_opts; | |
2210 | } | |
1da177e4 LT |
2211 | |
2212 | if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) | |
2213 | ext3_abort(sb, __FUNCTION__, "Abort forced by user"); | |
2214 | ||
2215 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
2216 | ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
2217 | ||
2218 | es = sbi->s_es; | |
2219 | ||
2220 | ext3_init_journal_params(sb, sbi->s_journal); | |
2221 | ||
2222 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
2223 | n_blocks_count > le32_to_cpu(es->s_blocks_count)) { | |
08c6a96f JK |
2224 | if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) { |
2225 | err = -EROFS; | |
2226 | goto restore_opts; | |
2227 | } | |
1da177e4 LT |
2228 | |
2229 | if (*flags & MS_RDONLY) { | |
2230 | /* | |
2231 | * First of all, the unconditional stuff we have to do | |
2232 | * to disable replay of the journal when we next remount | |
2233 | */ | |
2234 | sb->s_flags |= MS_RDONLY; | |
2235 | ||
2236 | /* | |
2237 | * OK, test if we are remounting a valid rw partition | |
2238 | * readonly, and if so set the rdonly flag and then | |
2239 | * mark the partition as valid again. | |
2240 | */ | |
2241 | if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && | |
2242 | (sbi->s_mount_state & EXT3_VALID_FS)) | |
2243 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
2244 | ||
2245 | ext3_mark_recovery_complete(sb, es); | |
2246 | } else { | |
2247 | __le32 ret; | |
2248 | if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, | |
2249 | ~EXT3_FEATURE_RO_COMPAT_SUPP))) { | |
2250 | printk(KERN_WARNING "EXT3-fs: %s: couldn't " | |
2251 | "remount RDWR because of unsupported " | |
2252 | "optional features (%x).\n", | |
2253 | sb->s_id, le32_to_cpu(ret)); | |
08c6a96f JK |
2254 | err = -EROFS; |
2255 | goto restore_opts; | |
1da177e4 LT |
2256 | } |
2257 | /* | |
2258 | * Mounting a RDONLY partition read-write, so reread | |
2259 | * and store the current valid flag. (It may have | |
2260 | * been changed by e2fsck since we originally mounted | |
2261 | * the partition.) | |
2262 | */ | |
2263 | ext3_clear_journal_err(sb, es); | |
2264 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
08c6a96f JK |
2265 | if ((ret = ext3_group_extend(sb, es, n_blocks_count))) { |
2266 | err = ret; | |
2267 | goto restore_opts; | |
2268 | } | |
1da177e4 LT |
2269 | if (!ext3_setup_super (sb, es, 0)) |
2270 | sb->s_flags &= ~MS_RDONLY; | |
2271 | } | |
2272 | } | |
08c6a96f JK |
2273 | #ifdef CONFIG_QUOTA |
2274 | /* Release old quota file names */ | |
2275 | for (i = 0; i < MAXQUOTAS; i++) | |
2276 | if (old_opts.s_qf_names[i] && | |
2277 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2278 | kfree(old_opts.s_qf_names[i]); | |
2279 | #endif | |
1da177e4 | 2280 | return 0; |
08c6a96f JK |
2281 | restore_opts: |
2282 | sb->s_flags = old_sb_flags; | |
2283 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2284 | sbi->s_resuid = old_opts.s_resuid; | |
2285 | sbi->s_resgid = old_opts.s_resgid; | |
2286 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2287 | #ifdef CONFIG_QUOTA | |
2288 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2289 | for (i = 0; i < MAXQUOTAS; i++) { | |
2290 | if (sbi->s_qf_names[i] && | |
2291 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2292 | kfree(sbi->s_qf_names[i]); | |
2293 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2294 | } | |
2295 | #endif | |
2296 | return err; | |
1da177e4 LT |
2297 | } |
2298 | ||
2299 | static int ext3_statfs (struct super_block * sb, struct kstatfs * buf) | |
2300 | { | |
2301 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | |
2302 | unsigned long overhead; | |
2303 | int i; | |
2304 | ||
2305 | if (test_opt (sb, MINIX_DF)) | |
2306 | overhead = 0; | |
2307 | else { | |
2308 | unsigned long ngroups; | |
2309 | ngroups = EXT3_SB(sb)->s_groups_count; | |
2310 | smp_rmb(); | |
2311 | ||
2312 | /* | |
2313 | * Compute the overhead (FS structures) | |
2314 | */ | |
2315 | ||
2316 | /* | |
2317 | * All of the blocks before first_data_block are | |
2318 | * overhead | |
2319 | */ | |
2320 | overhead = le32_to_cpu(es->s_first_data_block); | |
2321 | ||
2322 | /* | |
2323 | * Add the overhead attributed to the superblock and | |
2324 | * block group descriptors. If the sparse superblocks | |
2325 | * feature is turned on, then not all groups have this. | |
2326 | */ | |
2327 | for (i = 0; i < ngroups; i++) { | |
2328 | overhead += ext3_bg_has_super(sb, i) + | |
2329 | ext3_bg_num_gdb(sb, i); | |
2330 | cond_resched(); | |
2331 | } | |
2332 | ||
2333 | /* | |
2334 | * Every block group has an inode bitmap, a block | |
2335 | * bitmap, and an inode table. | |
2336 | */ | |
2337 | overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group)); | |
2338 | } | |
2339 | ||
2340 | buf->f_type = EXT3_SUPER_MAGIC; | |
2341 | buf->f_bsize = sb->s_blocksize; | |
2342 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; | |
2343 | buf->f_bfree = ext3_count_free_blocks (sb); | |
2344 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); | |
2345 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
2346 | buf->f_bavail = 0; | |
2347 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
2348 | buf->f_ffree = ext3_count_free_inodes (sb); | |
2349 | buf->f_namelen = EXT3_NAME_LEN; | |
2350 | return 0; | |
2351 | } | |
2352 | ||
2353 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2354 | * is locked for write. Otherwise the are possible deadlocks: | |
2355 | * Process 1 Process 2 | |
2356 | * ext3_create() quota_sync() | |
2357 | * journal_start() write_dquot() | |
2358 | * DQUOT_INIT() down(dqio_sem) | |
2359 | * down(dqio_sem) journal_start() | |
2360 | * | |
2361 | */ | |
2362 | ||
2363 | #ifdef CONFIG_QUOTA | |
2364 | ||
2365 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2366 | { | |
2367 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2368 | } | |
2369 | ||
2370 | static int ext3_dquot_initialize(struct inode *inode, int type) | |
2371 | { | |
2372 | handle_t *handle; | |
2373 | int ret, err; | |
2374 | ||
2375 | /* We may create quota structure so we need to reserve enough blocks */ | |
1f54587b | 2376 | handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb)); |
1da177e4 LT |
2377 | if (IS_ERR(handle)) |
2378 | return PTR_ERR(handle); | |
2379 | ret = dquot_initialize(inode, type); | |
2380 | err = ext3_journal_stop(handle); | |
2381 | if (!ret) | |
2382 | ret = err; | |
2383 | return ret; | |
2384 | } | |
2385 | ||
2386 | static int ext3_dquot_drop(struct inode *inode) | |
2387 | { | |
2388 | handle_t *handle; | |
2389 | int ret, err; | |
2390 | ||
2391 | /* We may delete quota structure so we need to reserve enough blocks */ | |
1f54587b | 2392 | handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb)); |
1da177e4 LT |
2393 | if (IS_ERR(handle)) |
2394 | return PTR_ERR(handle); | |
2395 | ret = dquot_drop(inode); | |
2396 | err = ext3_journal_stop(handle); | |
2397 | if (!ret) | |
2398 | ret = err; | |
2399 | return ret; | |
2400 | } | |
2401 | ||
2402 | static int ext3_write_dquot(struct dquot *dquot) | |
2403 | { | |
2404 | int ret, err; | |
2405 | handle_t *handle; | |
2406 | struct inode *inode; | |
2407 | ||
2408 | inode = dquot_to_inode(dquot); | |
2409 | handle = ext3_journal_start(inode, | |
1f54587b | 2410 | EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); |
1da177e4 LT |
2411 | if (IS_ERR(handle)) |
2412 | return PTR_ERR(handle); | |
2413 | ret = dquot_commit(dquot); | |
2414 | err = ext3_journal_stop(handle); | |
2415 | if (!ret) | |
2416 | ret = err; | |
2417 | return ret; | |
2418 | } | |
2419 | ||
2420 | static int ext3_acquire_dquot(struct dquot *dquot) | |
2421 | { | |
2422 | int ret, err; | |
2423 | handle_t *handle; | |
2424 | ||
2425 | handle = ext3_journal_start(dquot_to_inode(dquot), | |
1f54587b | 2426 | EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb)); |
1da177e4 LT |
2427 | if (IS_ERR(handle)) |
2428 | return PTR_ERR(handle); | |
2429 | ret = dquot_acquire(dquot); | |
2430 | err = ext3_journal_stop(handle); | |
2431 | if (!ret) | |
2432 | ret = err; | |
2433 | return ret; | |
2434 | } | |
2435 | ||
2436 | static int ext3_release_dquot(struct dquot *dquot) | |
2437 | { | |
2438 | int ret, err; | |
2439 | handle_t *handle; | |
2440 | ||
2441 | handle = ext3_journal_start(dquot_to_inode(dquot), | |
1f54587b | 2442 | EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb)); |
1da177e4 LT |
2443 | if (IS_ERR(handle)) |
2444 | return PTR_ERR(handle); | |
2445 | ret = dquot_release(dquot); | |
2446 | err = ext3_journal_stop(handle); | |
2447 | if (!ret) | |
2448 | ret = err; | |
2449 | return ret; | |
2450 | } | |
2451 | ||
2452 | static int ext3_mark_dquot_dirty(struct dquot *dquot) | |
2453 | { | |
2454 | /* Are we journalling quotas? */ | |
2455 | if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || | |
2456 | EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
2457 | dquot_mark_dquot_dirty(dquot); | |
2458 | return ext3_write_dquot(dquot); | |
2459 | } else { | |
2460 | return dquot_mark_dquot_dirty(dquot); | |
2461 | } | |
2462 | } | |
2463 | ||
2464 | static int ext3_write_info(struct super_block *sb, int type) | |
2465 | { | |
2466 | int ret, err; | |
2467 | handle_t *handle; | |
2468 | ||
2469 | /* Data block + inode block */ | |
2470 | handle = ext3_journal_start(sb->s_root->d_inode, 2); | |
2471 | if (IS_ERR(handle)) | |
2472 | return PTR_ERR(handle); | |
2473 | ret = dquot_commit_info(sb, type); | |
2474 | err = ext3_journal_stop(handle); | |
2475 | if (!ret) | |
2476 | ret = err; | |
2477 | return ret; | |
2478 | } | |
2479 | ||
2480 | /* | |
2481 | * Turn on quotas during mount time - we need to find | |
2482 | * the quota file and such... | |
2483 | */ | |
2484 | static int ext3_quota_on_mount(struct super_block *sb, int type) | |
2485 | { | |
84de856e CH |
2486 | return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type], |
2487 | EXT3_SB(sb)->s_jquota_fmt, type); | |
1da177e4 LT |
2488 | } |
2489 | ||
2490 | /* | |
2491 | * Standard function to be called on quota_on | |
2492 | */ | |
2493 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, | |
2494 | char *path) | |
2495 | { | |
2496 | int err; | |
2497 | struct nameidata nd; | |
2498 | ||
1f54587b JK |
2499 | if (!test_opt(sb, QUOTA)) |
2500 | return -EINVAL; | |
1da177e4 LT |
2501 | /* Not journalling quota? */ |
2502 | if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] && | |
2503 | !EXT3_SB(sb)->s_qf_names[GRPQUOTA]) | |
2504 | return vfs_quota_on(sb, type, format_id, path); | |
2505 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
2506 | if (err) | |
2507 | return err; | |
2508 | /* Quotafile not on the same filesystem? */ | |
2509 | if (nd.mnt->mnt_sb != sb) { | |
2510 | path_release(&nd); | |
2511 | return -EXDEV; | |
2512 | } | |
2513 | /* Quotafile not of fs root? */ | |
2514 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
2515 | printk(KERN_WARNING | |
2516 | "EXT3-fs: Quota file not on filesystem root. " | |
2517 | "Journalled quota will not work.\n"); | |
2518 | path_release(&nd); | |
2519 | return vfs_quota_on(sb, type, format_id, path); | |
2520 | } | |
2521 | ||
2522 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
2523 | * acquiring the locks... As quota files are never truncated and quota code | |
2524 | * itself serializes the operations (and noone else should touch the files) | |
2525 | * we don't have to be afraid of races */ | |
2526 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, | |
2527 | size_t len, loff_t off) | |
2528 | { | |
2529 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
2530 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); | |
2531 | int err = 0; | |
2532 | int offset = off & (sb->s_blocksize - 1); | |
2533 | int tocopy; | |
2534 | size_t toread; | |
2535 | struct buffer_head *bh; | |
2536 | loff_t i_size = i_size_read(inode); | |
2537 | ||
2538 | if (off > i_size) | |
2539 | return 0; | |
2540 | if (off+len > i_size) | |
2541 | len = i_size-off; | |
2542 | toread = len; | |
2543 | while (toread > 0) { | |
2544 | tocopy = sb->s_blocksize - offset < toread ? | |
2545 | sb->s_blocksize - offset : toread; | |
2546 | bh = ext3_bread(NULL, inode, blk, 0, &err); | |
2547 | if (err) | |
2548 | return err; | |
2549 | if (!bh) /* A hole? */ | |
2550 | memset(data, 0, tocopy); | |
2551 | else | |
2552 | memcpy(data, bh->b_data+offset, tocopy); | |
2553 | brelse(bh); | |
2554 | offset = 0; | |
2555 | toread -= tocopy; | |
2556 | data += tocopy; | |
2557 | blk++; | |
2558 | } | |
2559 | return len; | |
2560 | } | |
2561 | ||
2562 | /* Write to quotafile (we know the transaction is already started and has | |
2563 | * enough credits) */ | |
2564 | static ssize_t ext3_quota_write(struct super_block *sb, int type, | |
2565 | const char *data, size_t len, loff_t off) | |
2566 | { | |
2567 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
2568 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); | |
2569 | int err = 0; | |
2570 | int offset = off & (sb->s_blocksize - 1); | |
2571 | int tocopy; | |
2572 | int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL; | |
2573 | size_t towrite = len; | |
2574 | struct buffer_head *bh; | |
2575 | handle_t *handle = journal_current_handle(); | |
2576 | ||
2577 | down(&inode->i_sem); | |
2578 | while (towrite > 0) { | |
2579 | tocopy = sb->s_blocksize - offset < towrite ? | |
2580 | sb->s_blocksize - offset : towrite; | |
2581 | bh = ext3_bread(handle, inode, blk, 1, &err); | |
2582 | if (!bh) | |
2583 | goto out; | |
2584 | if (journal_quota) { | |
2585 | err = ext3_journal_get_write_access(handle, bh); | |
2586 | if (err) { | |
2587 | brelse(bh); | |
2588 | goto out; | |
2589 | } | |
2590 | } | |
2591 | lock_buffer(bh); | |
2592 | memcpy(bh->b_data+offset, data, tocopy); | |
2593 | flush_dcache_page(bh->b_page); | |
2594 | unlock_buffer(bh); | |
2595 | if (journal_quota) | |
2596 | err = ext3_journal_dirty_metadata(handle, bh); | |
2597 | else { | |
2598 | /* Always do at least ordered writes for quotas */ | |
2599 | err = ext3_journal_dirty_data(handle, bh); | |
2600 | mark_buffer_dirty(bh); | |
2601 | } | |
2602 | brelse(bh); | |
2603 | if (err) | |
2604 | goto out; | |
2605 | offset = 0; | |
2606 | towrite -= tocopy; | |
2607 | data += tocopy; | |
2608 | blk++; | |
2609 | } | |
2610 | out: | |
2611 | if (len == towrite) | |
2612 | return err; | |
2613 | if (inode->i_size < off+len-towrite) { | |
2614 | i_size_write(inode, off+len-towrite); | |
2615 | EXT3_I(inode)->i_disksize = inode->i_size; | |
2616 | } | |
2617 | inode->i_version++; | |
2618 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
2619 | ext3_mark_inode_dirty(handle, inode); | |
2620 | up(&inode->i_sem); | |
2621 | return len - towrite; | |
2622 | } | |
2623 | ||
2624 | #endif | |
2625 | ||
2626 | static struct super_block *ext3_get_sb(struct file_system_type *fs_type, | |
2627 | int flags, const char *dev_name, void *data) | |
2628 | { | |
2629 | return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super); | |
2630 | } | |
2631 | ||
2632 | static struct file_system_type ext3_fs_type = { | |
2633 | .owner = THIS_MODULE, | |
2634 | .name = "ext3", | |
2635 | .get_sb = ext3_get_sb, | |
2636 | .kill_sb = kill_block_super, | |
2637 | .fs_flags = FS_REQUIRES_DEV, | |
2638 | }; | |
2639 | ||
2640 | static int __init init_ext3_fs(void) | |
2641 | { | |
2642 | int err = init_ext3_xattr(); | |
2643 | if (err) | |
2644 | return err; | |
2645 | err = init_inodecache(); | |
2646 | if (err) | |
2647 | goto out1; | |
2648 | err = register_filesystem(&ext3_fs_type); | |
2649 | if (err) | |
2650 | goto out; | |
2651 | return 0; | |
2652 | out: | |
2653 | destroy_inodecache(); | |
2654 | out1: | |
2655 | exit_ext3_xattr(); | |
2656 | return err; | |
2657 | } | |
2658 | ||
2659 | static void __exit exit_ext3_fs(void) | |
2660 | { | |
2661 | unregister_filesystem(&ext3_fs_type); | |
2662 | destroy_inodecache(); | |
2663 | exit_ext3_xattr(); | |
2664 | } | |
2665 | ||
2666 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
2667 | MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); | |
2668 | MODULE_LICENSE("GPL"); | |
2669 | module_init(init_ext3_fs) | |
2670 | module_exit(exit_ext3_fs) |