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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/super.c |
ac27a0ec DK |
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/module.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/time.h> | |
dab291af | 23 | #include <linux/jbd2.h> |
617ba13b | 24 | #include <linux/ext4_fs.h> |
dab291af | 25 | #include <linux/ext4_jbd2.h> |
ac27a0ec DK |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/blkdev.h> | |
29 | #include <linux/parser.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/buffer_head.h> | |
32 | #include <linux/vfs.h> | |
33 | #include <linux/random.h> | |
34 | #include <linux/mount.h> | |
35 | #include <linux/namei.h> | |
36 | #include <linux/quotaops.h> | |
37 | #include <linux/seq_file.h> | |
38 | ||
39 | #include <asm/uaccess.h> | |
40 | ||
41 | #include "xattr.h" | |
42 | #include "acl.h" | |
43 | #include "namei.h" | |
44 | ||
617ba13b | 45 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 46 | unsigned long journal_devnum); |
617ba13b | 47 | static int ext4_create_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 48 | unsigned int); |
617ba13b MC |
49 | static void ext4_commit_super (struct super_block * sb, |
50 | struct ext4_super_block * es, | |
ac27a0ec | 51 | int sync); |
617ba13b MC |
52 | static void ext4_mark_recovery_complete(struct super_block * sb, |
53 | struct ext4_super_block * es); | |
54 | static void ext4_clear_journal_err(struct super_block * sb, | |
55 | struct ext4_super_block * es); | |
56 | static int ext4_sync_fs(struct super_block *sb, int wait); | |
57 | static const char *ext4_decode_error(struct super_block * sb, int errno, | |
ac27a0ec | 58 | char nbuf[16]); |
617ba13b MC |
59 | static int ext4_remount (struct super_block * sb, int * flags, char * data); |
60 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); | |
61 | static void ext4_unlockfs(struct super_block *sb); | |
62 | static void ext4_write_super (struct super_block * sb); | |
63 | static void ext4_write_super_lockfs(struct super_block *sb); | |
ac27a0ec DK |
64 | |
65 | /* | |
dab291af | 66 | * Wrappers for jbd2_journal_start/end. |
ac27a0ec DK |
67 | * |
68 | * The only special thing we need to do here is to make sure that all | |
69 | * journal_end calls result in the superblock being marked dirty, so | |
70 | * that sync() will call the filesystem's write_super callback if | |
71 | * appropriate. | |
72 | */ | |
617ba13b | 73 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
74 | { |
75 | journal_t *journal; | |
76 | ||
77 | if (sb->s_flags & MS_RDONLY) | |
78 | return ERR_PTR(-EROFS); | |
79 | ||
80 | /* Special case here: if the journal has aborted behind our | |
81 | * backs (eg. EIO in the commit thread), then we still need to | |
82 | * take the FS itself readonly cleanly. */ | |
617ba13b | 83 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 84 | if (is_journal_aborted(journal)) { |
617ba13b | 85 | ext4_abort(sb, __FUNCTION__, |
ac27a0ec DK |
86 | "Detected aborted journal"); |
87 | return ERR_PTR(-EROFS); | |
88 | } | |
89 | ||
dab291af | 90 | return jbd2_journal_start(journal, nblocks); |
ac27a0ec DK |
91 | } |
92 | ||
93 | /* | |
94 | * The only special thing we need to do here is to make sure that all | |
dab291af | 95 | * jbd2_journal_stop calls result in the superblock being marked dirty, so |
ac27a0ec DK |
96 | * that sync() will call the filesystem's write_super callback if |
97 | * appropriate. | |
98 | */ | |
617ba13b | 99 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
100 | { |
101 | struct super_block *sb; | |
102 | int err; | |
103 | int rc; | |
104 | ||
105 | sb = handle->h_transaction->t_journal->j_private; | |
106 | err = handle->h_err; | |
dab291af | 107 | rc = jbd2_journal_stop(handle); |
ac27a0ec DK |
108 | |
109 | if (!err) | |
110 | err = rc; | |
111 | if (err) | |
617ba13b | 112 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
113 | return err; |
114 | } | |
115 | ||
617ba13b | 116 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
117 | struct buffer_head *bh, handle_t *handle, int err) |
118 | { | |
119 | char nbuf[16]; | |
617ba13b | 120 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec DK |
121 | |
122 | if (bh) | |
123 | BUFFER_TRACE(bh, "abort"); | |
124 | ||
125 | if (!handle->h_err) | |
126 | handle->h_err = err; | |
127 | ||
128 | if (is_handle_aborted(handle)) | |
129 | return; | |
130 | ||
131 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
132 | caller, errstr, err_fn); | |
133 | ||
dab291af | 134 | jbd2_journal_abort_handle(handle); |
ac27a0ec DK |
135 | } |
136 | ||
137 | /* Deal with the reporting of failure conditions on a filesystem such as | |
138 | * inconsistencies detected or read IO failures. | |
139 | * | |
140 | * On ext2, we can store the error state of the filesystem in the | |
617ba13b | 141 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
142 | * write ordering constraints on the superblock which prevent us from |
143 | * writing it out straight away; and given that the journal is about to | |
144 | * be aborted, we can't rely on the current, or future, transactions to | |
145 | * write out the superblock safely. | |
146 | * | |
dab291af | 147 | * We'll just use the jbd2_journal_abort() error code to record an error in |
ac27a0ec DK |
148 | * the journal instead. On recovery, the journal will compain about |
149 | * that error until we've noted it down and cleared it. | |
150 | */ | |
151 | ||
617ba13b | 152 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 153 | { |
617ba13b | 154 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 155 | |
617ba13b MC |
156 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
157 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
158 | |
159 | if (sb->s_flags & MS_RDONLY) | |
160 | return; | |
161 | ||
162 | if (!test_opt (sb, ERRORS_CONT)) { | |
617ba13b | 163 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 164 | |
617ba13b | 165 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec | 166 | if (journal) |
dab291af | 167 | jbd2_journal_abort(journal, -EIO); |
ac27a0ec DK |
168 | } |
169 | if (test_opt (sb, ERRORS_RO)) { | |
170 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
171 | sb->s_flags |= MS_RDONLY; | |
172 | } | |
617ba13b | 173 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 174 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 175 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
176 | sb->s_id); |
177 | } | |
178 | ||
617ba13b | 179 | void ext4_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
180 | const char * fmt, ...) |
181 | { | |
182 | va_list args; | |
183 | ||
184 | va_start(args, fmt); | |
617ba13b | 185 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
186 | vprintk(fmt, args); |
187 | printk("\n"); | |
188 | va_end(args); | |
189 | ||
617ba13b | 190 | ext4_handle_error(sb); |
ac27a0ec DK |
191 | } |
192 | ||
617ba13b | 193 | static const char *ext4_decode_error(struct super_block * sb, int errno, |
ac27a0ec DK |
194 | char nbuf[16]) |
195 | { | |
196 | char *errstr = NULL; | |
197 | ||
198 | switch (errno) { | |
199 | case -EIO: | |
200 | errstr = "IO failure"; | |
201 | break; | |
202 | case -ENOMEM: | |
203 | errstr = "Out of memory"; | |
204 | break; | |
205 | case -EROFS: | |
dab291af | 206 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) |
ac27a0ec DK |
207 | errstr = "Journal has aborted"; |
208 | else | |
209 | errstr = "Readonly filesystem"; | |
210 | break; | |
211 | default: | |
212 | /* If the caller passed in an extra buffer for unknown | |
213 | * errors, textualise them now. Else we just return | |
214 | * NULL. */ | |
215 | if (nbuf) { | |
216 | /* Check for truncated error codes... */ | |
217 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
218 | errstr = nbuf; | |
219 | } | |
220 | break; | |
221 | } | |
222 | ||
223 | return errstr; | |
224 | } | |
225 | ||
617ba13b | 226 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
227 | * automatically and invokes the appropriate error response. */ |
228 | ||
617ba13b | 229 | void __ext4_std_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
230 | int errno) |
231 | { | |
232 | char nbuf[16]; | |
233 | const char *errstr; | |
234 | ||
235 | /* Special case: if the error is EROFS, and we're not already | |
236 | * inside a transaction, then there's really no point in logging | |
237 | * an error. */ | |
238 | if (errno == -EROFS && journal_current_handle() == NULL && | |
239 | (sb->s_flags & MS_RDONLY)) | |
240 | return; | |
241 | ||
617ba13b MC |
242 | errstr = ext4_decode_error(sb, errno, nbuf); |
243 | printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", | |
ac27a0ec DK |
244 | sb->s_id, function, errstr); |
245 | ||
617ba13b | 246 | ext4_handle_error(sb); |
ac27a0ec DK |
247 | } |
248 | ||
249 | /* | |
617ba13b | 250 | * ext4_abort is a much stronger failure handler than ext4_error. The |
ac27a0ec DK |
251 | * abort function may be used to deal with unrecoverable failures such |
252 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
253 | * | |
254 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
255 | * unless the error response on the fs has been set to panic in which | |
256 | * case we take the easy way out and panic immediately. | |
257 | */ | |
258 | ||
617ba13b | 259 | void ext4_abort (struct super_block * sb, const char * function, |
ac27a0ec DK |
260 | const char * fmt, ...) |
261 | { | |
262 | va_list args; | |
263 | ||
617ba13b | 264 | printk (KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
265 | |
266 | va_start(args, fmt); | |
617ba13b | 267 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
268 | vprintk(fmt, args); |
269 | printk("\n"); | |
270 | va_end(args); | |
271 | ||
272 | if (test_opt(sb, ERRORS_PANIC)) | |
617ba13b | 273 | panic("EXT4-fs panic from previous error\n"); |
ac27a0ec DK |
274 | |
275 | if (sb->s_flags & MS_RDONLY) | |
276 | return; | |
277 | ||
278 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
617ba13b | 279 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
ac27a0ec | 280 | sb->s_flags |= MS_RDONLY; |
617ba13b | 281 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
dab291af | 282 | jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
ac27a0ec DK |
283 | } |
284 | ||
617ba13b | 285 | void ext4_warning (struct super_block * sb, const char * function, |
ac27a0ec DK |
286 | const char * fmt, ...) |
287 | { | |
288 | va_list args; | |
289 | ||
290 | va_start(args, fmt); | |
617ba13b | 291 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
ac27a0ec DK |
292 | sb->s_id, function); |
293 | vprintk(fmt, args); | |
294 | printk("\n"); | |
295 | va_end(args); | |
296 | } | |
297 | ||
617ba13b | 298 | void ext4_update_dynamic_rev(struct super_block *sb) |
ac27a0ec | 299 | { |
617ba13b | 300 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 301 | |
617ba13b | 302 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
ac27a0ec DK |
303 | return; |
304 | ||
617ba13b | 305 | ext4_warning(sb, __FUNCTION__, |
ac27a0ec DK |
306 | "updating to rev %d because of new feature flag, " |
307 | "running e2fsck is recommended", | |
617ba13b | 308 | EXT4_DYNAMIC_REV); |
ac27a0ec | 309 | |
617ba13b MC |
310 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
311 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
312 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
ac27a0ec DK |
313 | /* leave es->s_feature_*compat flags alone */ |
314 | /* es->s_uuid will be set by e2fsck if empty */ | |
315 | ||
316 | /* | |
317 | * The rest of the superblock fields should be zero, and if not it | |
318 | * means they are likely already in use, so leave them alone. We | |
319 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
320 | */ | |
321 | } | |
322 | ||
323 | /* | |
324 | * Open the external journal device | |
325 | */ | |
617ba13b | 326 | static struct block_device *ext4_blkdev_get(dev_t dev) |
ac27a0ec DK |
327 | { |
328 | struct block_device *bdev; | |
329 | char b[BDEVNAME_SIZE]; | |
330 | ||
331 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
332 | if (IS_ERR(bdev)) | |
333 | goto fail; | |
334 | return bdev; | |
335 | ||
336 | fail: | |
617ba13b | 337 | printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", |
ac27a0ec DK |
338 | __bdevname(dev, b), PTR_ERR(bdev)); |
339 | return NULL; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Release the journal device | |
344 | */ | |
617ba13b | 345 | static int ext4_blkdev_put(struct block_device *bdev) |
ac27a0ec DK |
346 | { |
347 | bd_release(bdev); | |
348 | return blkdev_put(bdev); | |
349 | } | |
350 | ||
617ba13b | 351 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
ac27a0ec DK |
352 | { |
353 | struct block_device *bdev; | |
354 | int ret = -ENODEV; | |
355 | ||
356 | bdev = sbi->journal_bdev; | |
357 | if (bdev) { | |
617ba13b | 358 | ret = ext4_blkdev_put(bdev); |
ac27a0ec DK |
359 | sbi->journal_bdev = NULL; |
360 | } | |
361 | return ret; | |
362 | } | |
363 | ||
364 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
365 | { | |
617ba13b | 366 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
367 | } |
368 | ||
617ba13b | 369 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
ac27a0ec DK |
370 | { |
371 | struct list_head *l; | |
372 | ||
373 | printk(KERN_ERR "sb orphan head is %d\n", | |
374 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
375 | ||
376 | printk(KERN_ERR "sb_info orphan list:\n"); | |
377 | list_for_each(l, &sbi->s_orphan) { | |
378 | struct inode *inode = orphan_list_entry(l); | |
379 | printk(KERN_ERR " " | |
380 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
381 | inode->i_sb->s_id, inode->i_ino, inode, | |
382 | inode->i_mode, inode->i_nlink, | |
383 | NEXT_ORPHAN(inode)); | |
384 | } | |
385 | } | |
386 | ||
617ba13b | 387 | static void ext4_put_super (struct super_block * sb) |
ac27a0ec | 388 | { |
617ba13b MC |
389 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
390 | struct ext4_super_block *es = sbi->s_es; | |
ac27a0ec DK |
391 | int i; |
392 | ||
a86c6181 | 393 | ext4_ext_release(sb); |
617ba13b | 394 | ext4_xattr_put_super(sb); |
dab291af | 395 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec | 396 | if (!(sb->s_flags & MS_RDONLY)) { |
617ba13b | 397 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec DK |
398 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
399 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
400 | mark_buffer_dirty(sbi->s_sbh); | |
617ba13b | 401 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
402 | } |
403 | ||
404 | for (i = 0; i < sbi->s_gdb_count; i++) | |
405 | brelse(sbi->s_group_desc[i]); | |
406 | kfree(sbi->s_group_desc); | |
407 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
408 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
409 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
410 | brelse(sbi->s_sbh); | |
411 | #ifdef CONFIG_QUOTA | |
412 | for (i = 0; i < MAXQUOTAS; i++) | |
413 | kfree(sbi->s_qf_names[i]); | |
414 | #endif | |
415 | ||
416 | /* Debugging code just in case the in-memory inode orphan list | |
417 | * isn't empty. The on-disk one can be non-empty if we've | |
418 | * detected an error and taken the fs readonly, but the | |
419 | * in-memory list had better be clean by this point. */ | |
420 | if (!list_empty(&sbi->s_orphan)) | |
421 | dump_orphan_list(sb, sbi); | |
422 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
423 | ||
424 | invalidate_bdev(sb->s_bdev, 0); | |
425 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { | |
426 | /* | |
427 | * Invalidate the journal device's buffers. We don't want them | |
428 | * floating about in memory - the physical journal device may | |
429 | * hotswapped, and it breaks the `ro-after' testing code. | |
430 | */ | |
431 | sync_blockdev(sbi->journal_bdev); | |
432 | invalidate_bdev(sbi->journal_bdev, 0); | |
617ba13b | 433 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
434 | } |
435 | sb->s_fs_info = NULL; | |
436 | kfree(sbi); | |
437 | return; | |
438 | } | |
439 | ||
617ba13b | 440 | static kmem_cache_t *ext4_inode_cachep; |
ac27a0ec DK |
441 | |
442 | /* | |
443 | * Called inside transaction, so use GFP_NOFS | |
444 | */ | |
617ba13b | 445 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 446 | { |
617ba13b | 447 | struct ext4_inode_info *ei; |
ac27a0ec | 448 | |
617ba13b | 449 | ei = kmem_cache_alloc(ext4_inode_cachep, SLAB_NOFS); |
ac27a0ec DK |
450 | if (!ei) |
451 | return NULL; | |
617ba13b MC |
452 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
453 | ei->i_acl = EXT4_ACL_NOT_CACHED; | |
454 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
455 | #endif |
456 | ei->i_block_alloc_info = NULL; | |
457 | ei->vfs_inode.i_version = 1; | |
a86c6181 | 458 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
ac27a0ec DK |
459 | return &ei->vfs_inode; |
460 | } | |
461 | ||
617ba13b | 462 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 463 | { |
617ba13b | 464 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
465 | } |
466 | ||
467 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
468 | { | |
617ba13b | 469 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec DK |
470 | |
471 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
472 | SLAB_CTOR_CONSTRUCTOR) { | |
473 | INIT_LIST_HEAD(&ei->i_orphan); | |
617ba13b | 474 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
475 | init_rwsem(&ei->xattr_sem); |
476 | #endif | |
477 | mutex_init(&ei->truncate_mutex); | |
478 | inode_init_once(&ei->vfs_inode); | |
479 | } | |
480 | } | |
481 | ||
482 | static int init_inodecache(void) | |
483 | { | |
617ba13b MC |
484 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
485 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
486 | 0, (SLAB_RECLAIM_ACCOUNT| |
487 | SLAB_MEM_SPREAD), | |
488 | init_once, NULL); | |
617ba13b | 489 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
490 | return -ENOMEM; |
491 | return 0; | |
492 | } | |
493 | ||
494 | static void destroy_inodecache(void) | |
495 | { | |
617ba13b | 496 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
497 | } |
498 | ||
617ba13b | 499 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 500 | { |
617ba13b MC |
501 | struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; |
502 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
503 | if (EXT4_I(inode)->i_acl && | |
504 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
505 | posix_acl_release(EXT4_I(inode)->i_acl); | |
506 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
507 | } | |
508 | if (EXT4_I(inode)->i_default_acl && | |
509 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
510 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
511 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
512 | } |
513 | #endif | |
617ba13b MC |
514 | ext4_discard_reservation(inode); |
515 | EXT4_I(inode)->i_block_alloc_info = NULL; | |
ac27a0ec DK |
516 | if (unlikely(rsv)) |
517 | kfree(rsv); | |
518 | } | |
519 | ||
617ba13b | 520 | static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) |
ac27a0ec DK |
521 | { |
522 | #if defined(CONFIG_QUOTA) | |
617ba13b | 523 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
524 | |
525 | if (sbi->s_jquota_fmt) | |
526 | seq_printf(seq, ",jqfmt=%s", | |
527 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
528 | ||
529 | if (sbi->s_qf_names[USRQUOTA]) | |
530 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
531 | ||
532 | if (sbi->s_qf_names[GRPQUOTA]) | |
533 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
534 | ||
617ba13b | 535 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
536 | seq_puts(seq, ",usrquota"); |
537 | ||
617ba13b | 538 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
539 | seq_puts(seq, ",grpquota"); |
540 | #endif | |
541 | } | |
542 | ||
617ba13b | 543 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec DK |
544 | { |
545 | struct super_block *sb = vfs->mnt_sb; | |
546 | ||
617ba13b | 547 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 548 | seq_puts(seq, ",data=journal"); |
617ba13b | 549 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 550 | seq_puts(seq, ",data=ordered"); |
617ba13b | 551 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
552 | seq_puts(seq, ",data=writeback"); |
553 | ||
617ba13b | 554 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
555 | |
556 | return 0; | |
557 | } | |
558 | ||
559 | ||
617ba13b | 560 | static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp) |
ac27a0ec DK |
561 | { |
562 | __u32 *objp = vobjp; | |
563 | unsigned long ino = objp[0]; | |
564 | __u32 generation = objp[1]; | |
565 | struct inode *inode; | |
566 | struct dentry *result; | |
567 | ||
617ba13b | 568 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 569 | return ERR_PTR(-ESTALE); |
617ba13b | 570 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
571 | return ERR_PTR(-ESTALE); |
572 | ||
573 | /* iget isn't really right if the inode is currently unallocated!! | |
574 | * | |
617ba13b | 575 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
576 | * deleted, so we should be safe. |
577 | * | |
578 | * Currently we don't know the generation for parent directory, so | |
579 | * a generation of 0 means "accept any" | |
580 | */ | |
581 | inode = iget(sb, ino); | |
582 | if (inode == NULL) | |
583 | return ERR_PTR(-ENOMEM); | |
584 | if (is_bad_inode(inode) || | |
585 | (generation && inode->i_generation != generation)) { | |
586 | iput(inode); | |
587 | return ERR_PTR(-ESTALE); | |
588 | } | |
589 | /* now to find a dentry. | |
590 | * If possible, get a well-connected one | |
591 | */ | |
592 | result = d_alloc_anon(inode); | |
593 | if (!result) { | |
594 | iput(inode); | |
595 | return ERR_PTR(-ENOMEM); | |
596 | } | |
597 | return result; | |
598 | } | |
599 | ||
600 | #ifdef CONFIG_QUOTA | |
601 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") | |
602 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
603 | ||
617ba13b MC |
604 | static int ext4_dquot_initialize(struct inode *inode, int type); |
605 | static int ext4_dquot_drop(struct inode *inode); | |
606 | static int ext4_write_dquot(struct dquot *dquot); | |
607 | static int ext4_acquire_dquot(struct dquot *dquot); | |
608 | static int ext4_release_dquot(struct dquot *dquot); | |
609 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
610 | static int ext4_write_info(struct super_block *sb, int type); | |
611 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
612 | static int ext4_quota_on_mount(struct super_block *sb, int type); | |
613 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 614 | size_t len, loff_t off); |
617ba13b | 615 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
616 | const char *data, size_t len, loff_t off); |
617 | ||
617ba13b MC |
618 | static struct dquot_operations ext4_quota_operations = { |
619 | .initialize = ext4_dquot_initialize, | |
620 | .drop = ext4_dquot_drop, | |
ac27a0ec DK |
621 | .alloc_space = dquot_alloc_space, |
622 | .alloc_inode = dquot_alloc_inode, | |
623 | .free_space = dquot_free_space, | |
624 | .free_inode = dquot_free_inode, | |
625 | .transfer = dquot_transfer, | |
617ba13b MC |
626 | .write_dquot = ext4_write_dquot, |
627 | .acquire_dquot = ext4_acquire_dquot, | |
628 | .release_dquot = ext4_release_dquot, | |
629 | .mark_dirty = ext4_mark_dquot_dirty, | |
630 | .write_info = ext4_write_info | |
ac27a0ec DK |
631 | }; |
632 | ||
617ba13b MC |
633 | static struct quotactl_ops ext4_qctl_operations = { |
634 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
635 | .quota_off = vfs_quota_off, |
636 | .quota_sync = vfs_quota_sync, | |
637 | .get_info = vfs_get_dqinfo, | |
638 | .set_info = vfs_set_dqinfo, | |
639 | .get_dqblk = vfs_get_dqblk, | |
640 | .set_dqblk = vfs_set_dqblk | |
641 | }; | |
642 | #endif | |
643 | ||
617ba13b MC |
644 | static struct super_operations ext4_sops = { |
645 | .alloc_inode = ext4_alloc_inode, | |
646 | .destroy_inode = ext4_destroy_inode, | |
647 | .read_inode = ext4_read_inode, | |
648 | .write_inode = ext4_write_inode, | |
649 | .dirty_inode = ext4_dirty_inode, | |
650 | .delete_inode = ext4_delete_inode, | |
651 | .put_super = ext4_put_super, | |
652 | .write_super = ext4_write_super, | |
653 | .sync_fs = ext4_sync_fs, | |
654 | .write_super_lockfs = ext4_write_super_lockfs, | |
655 | .unlockfs = ext4_unlockfs, | |
656 | .statfs = ext4_statfs, | |
657 | .remount_fs = ext4_remount, | |
658 | .clear_inode = ext4_clear_inode, | |
659 | .show_options = ext4_show_options, | |
ac27a0ec | 660 | #ifdef CONFIG_QUOTA |
617ba13b MC |
661 | .quota_read = ext4_quota_read, |
662 | .quota_write = ext4_quota_write, | |
ac27a0ec DK |
663 | #endif |
664 | }; | |
665 | ||
617ba13b MC |
666 | static struct export_operations ext4_export_ops = { |
667 | .get_parent = ext4_get_parent, | |
668 | .get_dentry = ext4_get_dentry, | |
ac27a0ec DK |
669 | }; |
670 | ||
671 | enum { | |
672 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
673 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
674 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
675 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
676 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
677 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, | |
678 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
679 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
680 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
681 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
a86c6181 | 682 | Opt_grpquota, Opt_extents, |
ac27a0ec DK |
683 | }; |
684 | ||
685 | static match_table_t tokens = { | |
686 | {Opt_bsd_df, "bsddf"}, | |
687 | {Opt_minix_df, "minixdf"}, | |
688 | {Opt_grpid, "grpid"}, | |
689 | {Opt_grpid, "bsdgroups"}, | |
690 | {Opt_nogrpid, "nogrpid"}, | |
691 | {Opt_nogrpid, "sysvgroups"}, | |
692 | {Opt_resgid, "resgid=%u"}, | |
693 | {Opt_resuid, "resuid=%u"}, | |
694 | {Opt_sb, "sb=%u"}, | |
695 | {Opt_err_cont, "errors=continue"}, | |
696 | {Opt_err_panic, "errors=panic"}, | |
697 | {Opt_err_ro, "errors=remount-ro"}, | |
698 | {Opt_nouid32, "nouid32"}, | |
699 | {Opt_nocheck, "nocheck"}, | |
700 | {Opt_nocheck, "check=none"}, | |
701 | {Opt_debug, "debug"}, | |
702 | {Opt_oldalloc, "oldalloc"}, | |
703 | {Opt_orlov, "orlov"}, | |
704 | {Opt_user_xattr, "user_xattr"}, | |
705 | {Opt_nouser_xattr, "nouser_xattr"}, | |
706 | {Opt_acl, "acl"}, | |
707 | {Opt_noacl, "noacl"}, | |
708 | {Opt_reservation, "reservation"}, | |
709 | {Opt_noreservation, "noreservation"}, | |
710 | {Opt_noload, "noload"}, | |
711 | {Opt_nobh, "nobh"}, | |
712 | {Opt_bh, "bh"}, | |
713 | {Opt_commit, "commit=%u"}, | |
714 | {Opt_journal_update, "journal=update"}, | |
715 | {Opt_journal_inum, "journal=%u"}, | |
716 | {Opt_journal_dev, "journal_dev=%u"}, | |
717 | {Opt_abort, "abort"}, | |
718 | {Opt_data_journal, "data=journal"}, | |
719 | {Opt_data_ordered, "data=ordered"}, | |
720 | {Opt_data_writeback, "data=writeback"}, | |
721 | {Opt_offusrjquota, "usrjquota="}, | |
722 | {Opt_usrjquota, "usrjquota=%s"}, | |
723 | {Opt_offgrpjquota, "grpjquota="}, | |
724 | {Opt_grpjquota, "grpjquota=%s"}, | |
725 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
726 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
727 | {Opt_grpquota, "grpquota"}, | |
728 | {Opt_noquota, "noquota"}, | |
729 | {Opt_quota, "quota"}, | |
730 | {Opt_usrquota, "usrquota"}, | |
731 | {Opt_barrier, "barrier=%u"}, | |
a86c6181 | 732 | {Opt_extents, "extents"}, |
ac27a0ec DK |
733 | {Opt_err, NULL}, |
734 | {Opt_resize, "resize"}, | |
735 | }; | |
736 | ||
617ba13b | 737 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 738 | { |
617ba13b | 739 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
740 | char *options = (char *) *data; |
741 | ||
742 | if (!options || strncmp(options, "sb=", 3) != 0) | |
743 | return 1; /* Default location */ | |
744 | options += 3; | |
617ba13b | 745 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
746 | sb_block = simple_strtoul(options, &options, 0); |
747 | if (*options && *options != ',') { | |
617ba13b | 748 | printk("EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
749 | (char *) *data); |
750 | return 1; | |
751 | } | |
752 | if (*options == ',') | |
753 | options++; | |
754 | *data = (void *) options; | |
755 | return sb_block; | |
756 | } | |
757 | ||
758 | static int parse_options (char *options, struct super_block *sb, | |
759 | unsigned int *inum, unsigned long *journal_devnum, | |
617ba13b | 760 | ext4_fsblk_t *n_blocks_count, int is_remount) |
ac27a0ec | 761 | { |
617ba13b | 762 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
763 | char * p; |
764 | substring_t args[MAX_OPT_ARGS]; | |
765 | int data_opt = 0; | |
766 | int option; | |
767 | #ifdef CONFIG_QUOTA | |
768 | int qtype; | |
769 | char *qname; | |
770 | #endif | |
771 | ||
772 | if (!options) | |
773 | return 1; | |
774 | ||
775 | while ((p = strsep (&options, ",")) != NULL) { | |
776 | int token; | |
777 | if (!*p) | |
778 | continue; | |
779 | ||
780 | token = match_token(p, tokens, args); | |
781 | switch (token) { | |
782 | case Opt_bsd_df: | |
783 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
784 | break; | |
785 | case Opt_minix_df: | |
786 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
787 | break; | |
788 | case Opt_grpid: | |
789 | set_opt (sbi->s_mount_opt, GRPID); | |
790 | break; | |
791 | case Opt_nogrpid: | |
792 | clear_opt (sbi->s_mount_opt, GRPID); | |
793 | break; | |
794 | case Opt_resuid: | |
795 | if (match_int(&args[0], &option)) | |
796 | return 0; | |
797 | sbi->s_resuid = option; | |
798 | break; | |
799 | case Opt_resgid: | |
800 | if (match_int(&args[0], &option)) | |
801 | return 0; | |
802 | sbi->s_resgid = option; | |
803 | break; | |
804 | case Opt_sb: | |
805 | /* handled by get_sb_block() instead of here */ | |
806 | /* *sb_block = match_int(&args[0]); */ | |
807 | break; | |
808 | case Opt_err_panic: | |
809 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
810 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
811 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
812 | break; | |
813 | case Opt_err_ro: | |
814 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
815 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
816 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
817 | break; | |
818 | case Opt_err_cont: | |
819 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
820 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
821 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
822 | break; | |
823 | case Opt_nouid32: | |
824 | set_opt (sbi->s_mount_opt, NO_UID32); | |
825 | break; | |
826 | case Opt_nocheck: | |
827 | clear_opt (sbi->s_mount_opt, CHECK); | |
828 | break; | |
829 | case Opt_debug: | |
830 | set_opt (sbi->s_mount_opt, DEBUG); | |
831 | break; | |
832 | case Opt_oldalloc: | |
833 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
834 | break; | |
835 | case Opt_orlov: | |
836 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
837 | break; | |
617ba13b | 838 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
839 | case Opt_user_xattr: |
840 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
841 | break; | |
842 | case Opt_nouser_xattr: | |
843 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
844 | break; | |
845 | #else | |
846 | case Opt_user_xattr: | |
847 | case Opt_nouser_xattr: | |
617ba13b | 848 | printk("EXT4 (no)user_xattr options not supported\n"); |
ac27a0ec DK |
849 | break; |
850 | #endif | |
617ba13b | 851 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
ac27a0ec DK |
852 | case Opt_acl: |
853 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
854 | break; | |
855 | case Opt_noacl: | |
856 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
857 | break; | |
858 | #else | |
859 | case Opt_acl: | |
860 | case Opt_noacl: | |
617ba13b | 861 | printk("EXT4 (no)acl options not supported\n"); |
ac27a0ec DK |
862 | break; |
863 | #endif | |
864 | case Opt_reservation: | |
865 | set_opt(sbi->s_mount_opt, RESERVATION); | |
866 | break; | |
867 | case Opt_noreservation: | |
868 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
869 | break; | |
870 | case Opt_journal_update: | |
871 | /* @@@ FIXME */ | |
872 | /* Eventually we will want to be able to create | |
873 | a journal file here. For now, only allow the | |
874 | user to specify an existing inode to be the | |
875 | journal file. */ | |
876 | if (is_remount) { | |
617ba13b | 877 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
878 | "journal on remount\n"); |
879 | return 0; | |
880 | } | |
881 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
882 | break; | |
883 | case Opt_journal_inum: | |
884 | if (is_remount) { | |
617ba13b | 885 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
886 | "journal on remount\n"); |
887 | return 0; | |
888 | } | |
889 | if (match_int(&args[0], &option)) | |
890 | return 0; | |
891 | *inum = option; | |
892 | break; | |
893 | case Opt_journal_dev: | |
894 | if (is_remount) { | |
617ba13b | 895 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
896 | "journal on remount\n"); |
897 | return 0; | |
898 | } | |
899 | if (match_int(&args[0], &option)) | |
900 | return 0; | |
901 | *journal_devnum = option; | |
902 | break; | |
903 | case Opt_noload: | |
904 | set_opt (sbi->s_mount_opt, NOLOAD); | |
905 | break; | |
906 | case Opt_commit: | |
907 | if (match_int(&args[0], &option)) | |
908 | return 0; | |
909 | if (option < 0) | |
910 | return 0; | |
911 | if (option == 0) | |
912 | option = JBD_DEFAULT_MAX_COMMIT_AGE; | |
913 | sbi->s_commit_interval = HZ * option; | |
914 | break; | |
915 | case Opt_data_journal: | |
617ba13b | 916 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
917 | goto datacheck; |
918 | case Opt_data_ordered: | |
617ba13b | 919 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
920 | goto datacheck; |
921 | case Opt_data_writeback: | |
617ba13b | 922 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
923 | datacheck: |
924 | if (is_remount) { | |
617ba13b | 925 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
926 | != data_opt) { |
927 | printk(KERN_ERR | |
617ba13b | 928 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
929 | "mode on remount\n"); |
930 | return 0; | |
931 | } | |
932 | } else { | |
617ba13b | 933 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
934 | sbi->s_mount_opt |= data_opt; |
935 | } | |
936 | break; | |
937 | #ifdef CONFIG_QUOTA | |
938 | case Opt_usrjquota: | |
939 | qtype = USRQUOTA; | |
940 | goto set_qf_name; | |
941 | case Opt_grpjquota: | |
942 | qtype = GRPQUOTA; | |
943 | set_qf_name: | |
944 | if (sb_any_quota_enabled(sb)) { | |
945 | printk(KERN_ERR | |
617ba13b | 946 | "EXT4-fs: Cannot change journalled " |
ac27a0ec DK |
947 | "quota options when quota turned on.\n"); |
948 | return 0; | |
949 | } | |
950 | qname = match_strdup(&args[0]); | |
951 | if (!qname) { | |
952 | printk(KERN_ERR | |
617ba13b | 953 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
954 | "storing quotafile name.\n"); |
955 | return 0; | |
956 | } | |
957 | if (sbi->s_qf_names[qtype] && | |
958 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
959 | printk(KERN_ERR | |
617ba13b | 960 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
961 | "specified.\n", QTYPE2NAME(qtype)); |
962 | kfree(qname); | |
963 | return 0; | |
964 | } | |
965 | sbi->s_qf_names[qtype] = qname; | |
966 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
967 | printk(KERN_ERR | |
617ba13b | 968 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
969 | "filesystem root.\n"); |
970 | kfree(sbi->s_qf_names[qtype]); | |
971 | sbi->s_qf_names[qtype] = NULL; | |
972 | return 0; | |
973 | } | |
974 | set_opt(sbi->s_mount_opt, QUOTA); | |
975 | break; | |
976 | case Opt_offusrjquota: | |
977 | qtype = USRQUOTA; | |
978 | goto clear_qf_name; | |
979 | case Opt_offgrpjquota: | |
980 | qtype = GRPQUOTA; | |
981 | clear_qf_name: | |
982 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 983 | printk(KERN_ERR "EXT4-fs: Cannot change " |
ac27a0ec DK |
984 | "journalled quota options when " |
985 | "quota turned on.\n"); | |
986 | return 0; | |
987 | } | |
988 | /* | |
989 | * The space will be released later when all options | |
990 | * are confirmed to be correct | |
991 | */ | |
992 | sbi->s_qf_names[qtype] = NULL; | |
993 | break; | |
994 | case Opt_jqfmt_vfsold: | |
995 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
996 | break; | |
997 | case Opt_jqfmt_vfsv0: | |
998 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
999 | break; | |
1000 | case Opt_quota: | |
1001 | case Opt_usrquota: | |
1002 | set_opt(sbi->s_mount_opt, QUOTA); | |
1003 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1004 | break; | |
1005 | case Opt_grpquota: | |
1006 | set_opt(sbi->s_mount_opt, QUOTA); | |
1007 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1008 | break; | |
1009 | case Opt_noquota: | |
1010 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1011 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1012 | "options when quota turned on.\n"); |
1013 | return 0; | |
1014 | } | |
1015 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1016 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1017 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1018 | break; | |
1019 | #else | |
1020 | case Opt_quota: | |
1021 | case Opt_usrquota: | |
1022 | case Opt_grpquota: | |
1023 | case Opt_usrjquota: | |
1024 | case Opt_grpjquota: | |
1025 | case Opt_offusrjquota: | |
1026 | case Opt_offgrpjquota: | |
1027 | case Opt_jqfmt_vfsold: | |
1028 | case Opt_jqfmt_vfsv0: | |
1029 | printk(KERN_ERR | |
617ba13b | 1030 | "EXT4-fs: journalled quota options not " |
ac27a0ec DK |
1031 | "supported.\n"); |
1032 | break; | |
1033 | case Opt_noquota: | |
1034 | break; | |
1035 | #endif | |
1036 | case Opt_abort: | |
1037 | set_opt(sbi->s_mount_opt, ABORT); | |
1038 | break; | |
1039 | case Opt_barrier: | |
1040 | if (match_int(&args[0], &option)) | |
1041 | return 0; | |
1042 | if (option) | |
1043 | set_opt(sbi->s_mount_opt, BARRIER); | |
1044 | else | |
1045 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1046 | break; | |
1047 | case Opt_ignore: | |
1048 | break; | |
1049 | case Opt_resize: | |
1050 | if (!is_remount) { | |
617ba13b | 1051 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1052 | "for remount\n"); |
1053 | return 0; | |
1054 | } | |
1055 | if (match_int(&args[0], &option) != 0) | |
1056 | return 0; | |
1057 | *n_blocks_count = option; | |
1058 | break; | |
1059 | case Opt_nobh: | |
1060 | set_opt(sbi->s_mount_opt, NOBH); | |
1061 | break; | |
1062 | case Opt_bh: | |
1063 | clear_opt(sbi->s_mount_opt, NOBH); | |
1064 | break; | |
a86c6181 AT |
1065 | case Opt_extents: |
1066 | set_opt (sbi->s_mount_opt, EXTENTS); | |
1067 | break; | |
ac27a0ec DK |
1068 | default: |
1069 | printk (KERN_ERR | |
617ba13b | 1070 | "EXT4-fs: Unrecognized mount option \"%s\" " |
ac27a0ec DK |
1071 | "or missing value\n", p); |
1072 | return 0; | |
1073 | } | |
1074 | } | |
1075 | #ifdef CONFIG_QUOTA | |
1076 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1077 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1078 | sbi->s_qf_names[USRQUOTA]) |
1079 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1080 | ||
617ba13b | 1081 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1082 | sbi->s_qf_names[GRPQUOTA]) |
1083 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1084 | ||
1085 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1086 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1087 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1088 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1089 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1090 | "format mixing.\n"); |
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | if (!sbi->s_jquota_fmt) { | |
617ba13b | 1095 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1096 | "not specified.\n"); |
1097 | return 0; | |
1098 | } | |
1099 | } else { | |
1100 | if (sbi->s_jquota_fmt) { | |
617ba13b | 1101 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1102 | "specified with no journalling " |
1103 | "enabled.\n"); | |
1104 | return 0; | |
1105 | } | |
1106 | } | |
1107 | #endif | |
1108 | return 1; | |
1109 | } | |
1110 | ||
617ba13b | 1111 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1112 | int read_only) |
1113 | { | |
617ba13b | 1114 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1115 | int res = 0; |
1116 | ||
617ba13b MC |
1117 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
1118 | printk (KERN_ERR "EXT4-fs warning: revision level too high, " | |
ac27a0ec DK |
1119 | "forcing read-only mode\n"); |
1120 | res = MS_RDONLY; | |
1121 | } | |
1122 | if (read_only) | |
1123 | return res; | |
617ba13b MC |
1124 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
1125 | printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " | |
ac27a0ec | 1126 | "running e2fsck is recommended\n"); |
617ba13b | 1127 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
ac27a0ec | 1128 | printk (KERN_WARNING |
617ba13b | 1129 | "EXT4-fs warning: mounting fs with errors, " |
ac27a0ec DK |
1130 | "running e2fsck is recommended\n"); |
1131 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1132 | le16_to_cpu(es->s_mnt_count) >= | |
1133 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1134 | printk (KERN_WARNING | |
617ba13b | 1135 | "EXT4-fs warning: maximal mount count reached, " |
ac27a0ec DK |
1136 | "running e2fsck is recommended\n"); |
1137 | else if (le32_to_cpu(es->s_checkinterval) && | |
1138 | (le32_to_cpu(es->s_lastcheck) + | |
1139 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1140 | printk (KERN_WARNING | |
617ba13b | 1141 | "EXT4-fs warning: checktime reached, " |
ac27a0ec DK |
1142 | "running e2fsck is recommended\n"); |
1143 | #if 0 | |
1144 | /* @@@ We _will_ want to clear the valid bit if we find | |
1145 | inconsistencies, to force a fsck at reboot. But for | |
1146 | a plain journaled filesystem we can keep it set as | |
1147 | valid forever! :) */ | |
617ba13b | 1148 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); |
ac27a0ec DK |
1149 | #endif |
1150 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
617ba13b | 1151 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
ac27a0ec DK |
1152 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); |
1153 | es->s_mtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
1154 | ext4_update_dynamic_rev(sb); |
1155 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1156 | |
617ba13b | 1157 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1158 | if (test_opt(sb, DEBUG)) |
617ba13b | 1159 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
ac27a0ec DK |
1160 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1161 | sb->s_blocksize, | |
1162 | sbi->s_groups_count, | |
617ba13b MC |
1163 | EXT4_BLOCKS_PER_GROUP(sb), |
1164 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1165 | sbi->s_mount_opt); |
1166 | ||
617ba13b MC |
1167 | printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); |
1168 | if (EXT4_SB(sb)->s_journal->j_inode == NULL) { | |
ac27a0ec DK |
1169 | char b[BDEVNAME_SIZE]; |
1170 | ||
1171 | printk("external journal on %s\n", | |
617ba13b | 1172 | bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); |
ac27a0ec DK |
1173 | } else { |
1174 | printk("internal journal\n"); | |
1175 | } | |
1176 | return res; | |
1177 | } | |
1178 | ||
1179 | /* Called at mount-time, super-block is locked */ | |
617ba13b | 1180 | static int ext4_check_descriptors (struct super_block * sb) |
ac27a0ec | 1181 | { |
617ba13b MC |
1182 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1183 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1184 | ext4_fsblk_t last_block; | |
1185 | struct ext4_group_desc * gdp = NULL; | |
ac27a0ec DK |
1186 | int desc_block = 0; |
1187 | int i; | |
1188 | ||
617ba13b | 1189 | ext4_debug ("Checking group descriptors"); |
ac27a0ec DK |
1190 | |
1191 | for (i = 0; i < sbi->s_groups_count; i++) | |
1192 | { | |
1193 | if (i == sbi->s_groups_count - 1) | |
1194 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
1195 | else | |
1196 | last_block = first_block + | |
617ba13b | 1197 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1198 | |
617ba13b MC |
1199 | if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) |
1200 | gdp = (struct ext4_group_desc *) | |
ac27a0ec DK |
1201 | sbi->s_group_desc[desc_block++]->b_data; |
1202 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || | |
1203 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1204 | { | |
617ba13b | 1205 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec DK |
1206 | "Block bitmap for group %d" |
1207 | " not in group (block %lu)!", | |
1208 | i, (unsigned long) | |
1209 | le32_to_cpu(gdp->bg_block_bitmap)); | |
1210 | return 0; | |
1211 | } | |
1212 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || | |
1213 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1214 | { | |
617ba13b | 1215 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec DK |
1216 | "Inode bitmap for group %d" |
1217 | " not in group (block %lu)!", | |
1218 | i, (unsigned long) | |
1219 | le32_to_cpu(gdp->bg_inode_bitmap)); | |
1220 | return 0; | |
1221 | } | |
1222 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || | |
1223 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group > | |
1224 | last_block) | |
1225 | { | |
617ba13b | 1226 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec DK |
1227 | "Inode table for group %d" |
1228 | " not in group (block %lu)!", | |
1229 | i, (unsigned long) | |
1230 | le32_to_cpu(gdp->bg_inode_table)); | |
1231 | return 0; | |
1232 | } | |
617ba13b | 1233 | first_block += EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1234 | gdp++; |
1235 | } | |
1236 | ||
617ba13b MC |
1237 | sbi->s_es->s_free_blocks_count=cpu_to_le32(ext4_count_free_blocks(sb)); |
1238 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); | |
ac27a0ec DK |
1239 | return 1; |
1240 | } | |
1241 | ||
1242 | ||
617ba13b | 1243 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1244 | * the superblock) which were deleted from all directories, but held open by |
1245 | * a process at the time of a crash. We walk the list and try to delete these | |
1246 | * inodes at recovery time (only with a read-write filesystem). | |
1247 | * | |
1248 | * In order to keep the orphan inode chain consistent during traversal (in | |
1249 | * case of crash during recovery), we link each inode into the superblock | |
1250 | * orphan list_head and handle it the same way as an inode deletion during | |
1251 | * normal operation (which journals the operations for us). | |
1252 | * | |
1253 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1254 | * accidentally point at an in-use or already deleted inode. The worst that | |
1255 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1256 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1257 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1258 | * inode cleanup for us, so we can safely abort without any further action. | |
1259 | */ | |
617ba13b MC |
1260 | static void ext4_orphan_cleanup (struct super_block * sb, |
1261 | struct ext4_super_block * es) | |
ac27a0ec DK |
1262 | { |
1263 | unsigned int s_flags = sb->s_flags; | |
1264 | int nr_orphans = 0, nr_truncates = 0; | |
1265 | #ifdef CONFIG_QUOTA | |
1266 | int i; | |
1267 | #endif | |
1268 | if (!es->s_last_orphan) { | |
1269 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1270 | return; | |
1271 | } | |
1272 | ||
617ba13b | 1273 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1274 | if (es->s_last_orphan) |
1275 | jbd_debug(1, "Errors on filesystem, " | |
1276 | "clearing orphan list.\n"); | |
1277 | es->s_last_orphan = 0; | |
1278 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1279 | return; | |
1280 | } | |
1281 | ||
1282 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1283 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1284 | sb->s_id); |
1285 | sb->s_flags &= ~MS_RDONLY; | |
1286 | } | |
1287 | #ifdef CONFIG_QUOTA | |
1288 | /* Needed for iput() to work correctly and not trash data */ | |
1289 | sb->s_flags |= MS_ACTIVE; | |
1290 | /* Turn on quotas so that they are updated correctly */ | |
1291 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1292 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1293 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1294 | if (ret < 0) |
1295 | printk(KERN_ERR | |
617ba13b | 1296 | "EXT4-fs: Cannot turn on journalled " |
ac27a0ec DK |
1297 | "quota: error %d\n", ret); |
1298 | } | |
1299 | } | |
1300 | #endif | |
1301 | ||
1302 | while (es->s_last_orphan) { | |
1303 | struct inode *inode; | |
1304 | ||
1305 | if (!(inode = | |
617ba13b | 1306 | ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { |
ac27a0ec DK |
1307 | es->s_last_orphan = 0; |
1308 | break; | |
1309 | } | |
1310 | ||
617ba13b | 1311 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1312 | DQUOT_INIT(inode); |
1313 | if (inode->i_nlink) { | |
1314 | printk(KERN_DEBUG | |
1315 | "%s: truncating inode %lu to %Ld bytes\n", | |
1316 | __FUNCTION__, inode->i_ino, inode->i_size); | |
1317 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", | |
1318 | inode->i_ino, inode->i_size); | |
617ba13b | 1319 | ext4_truncate(inode); |
ac27a0ec DK |
1320 | nr_truncates++; |
1321 | } else { | |
1322 | printk(KERN_DEBUG | |
1323 | "%s: deleting unreferenced inode %lu\n", | |
1324 | __FUNCTION__, inode->i_ino); | |
1325 | jbd_debug(2, "deleting unreferenced inode %lu\n", | |
1326 | inode->i_ino); | |
1327 | nr_orphans++; | |
1328 | } | |
1329 | iput(inode); /* The delete magic happens here! */ | |
1330 | } | |
1331 | ||
1332 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1333 | ||
1334 | if (nr_orphans) | |
617ba13b | 1335 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1336 | sb->s_id, PLURAL(nr_orphans)); |
1337 | if (nr_truncates) | |
617ba13b | 1338 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1339 | sb->s_id, PLURAL(nr_truncates)); |
1340 | #ifdef CONFIG_QUOTA | |
1341 | /* Turn quotas off */ | |
1342 | for (i = 0; i < MAXQUOTAS; i++) { | |
1343 | if (sb_dqopt(sb)->files[i]) | |
1344 | vfs_quota_off(sb, i); | |
1345 | } | |
1346 | #endif | |
1347 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1348 | } | |
1349 | ||
1350 | #define log2(n) ffz(~(n)) | |
1351 | ||
1352 | /* | |
1353 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
1354 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
1355 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
1356 | */ | |
617ba13b | 1357 | static loff_t ext4_max_size(int bits) |
ac27a0ec | 1358 | { |
617ba13b | 1359 | loff_t res = EXT4_NDIR_BLOCKS; |
ac27a0ec DK |
1360 | /* This constant is calculated to be the largest file size for a |
1361 | * dense, 4k-blocksize file such that the total number of | |
1362 | * sectors in the file, including data and all indirect blocks, | |
1363 | * does not exceed 2^32. */ | |
1364 | const loff_t upper_limit = 0x1ff7fffd000LL; | |
1365 | ||
1366 | res += 1LL << (bits-2); | |
1367 | res += 1LL << (2*(bits-2)); | |
1368 | res += 1LL << (3*(bits-2)); | |
1369 | res <<= bits; | |
1370 | if (res > upper_limit) | |
1371 | res = upper_limit; | |
1372 | return res; | |
1373 | } | |
1374 | ||
617ba13b MC |
1375 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
1376 | ext4_fsblk_t logic_sb_block, | |
ac27a0ec DK |
1377 | int nr) |
1378 | { | |
617ba13b | 1379 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1380 | unsigned long bg, first_meta_bg; |
1381 | int has_super = 0; | |
1382 | ||
1383 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1384 | ||
617ba13b | 1385 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec DK |
1386 | nr < first_meta_bg) |
1387 | return (logic_sb_block + nr + 1); | |
1388 | bg = sbi->s_desc_per_block * nr; | |
617ba13b | 1389 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1390 | has_super = 1; |
617ba13b | 1391 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1392 | } |
1393 | ||
1394 | ||
617ba13b | 1395 | static int ext4_fill_super (struct super_block *sb, void *data, int silent) |
ac27a0ec DK |
1396 | { |
1397 | struct buffer_head * bh; | |
617ba13b MC |
1398 | struct ext4_super_block *es = NULL; |
1399 | struct ext4_sb_info *sbi; | |
1400 | ext4_fsblk_t block; | |
1401 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
1402 | ext4_fsblk_t logic_sb_block; | |
ac27a0ec DK |
1403 | unsigned long offset = 0; |
1404 | unsigned int journal_inum = 0; | |
1405 | unsigned long journal_devnum = 0; | |
1406 | unsigned long def_mount_opts; | |
1407 | struct inode *root; | |
1408 | int blocksize; | |
1409 | int hblock; | |
1410 | int db_count; | |
1411 | int i; | |
1412 | int needs_recovery; | |
1413 | __le32 features; | |
1414 | ||
1415 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1416 | if (!sbi) | |
1417 | return -ENOMEM; | |
1418 | sb->s_fs_info = sbi; | |
1419 | sbi->s_mount_opt = 0; | |
617ba13b MC |
1420 | sbi->s_resuid = EXT4_DEF_RESUID; |
1421 | sbi->s_resgid = EXT4_DEF_RESGID; | |
ac27a0ec DK |
1422 | |
1423 | unlock_kernel(); | |
1424 | ||
617ba13b | 1425 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 1426 | if (!blocksize) { |
617ba13b | 1427 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
1428 | goto out_fail; |
1429 | } | |
1430 | ||
1431 | /* | |
617ba13b | 1432 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
1433 | * block sizes. We need to calculate the offset from buffer start. |
1434 | */ | |
617ba13b | 1435 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
3a5b2ecd MC |
1436 | logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1437 | offset = sector_div(logic_sb_block, blocksize); | |
ac27a0ec DK |
1438 | } else { |
1439 | logic_sb_block = sb_block; | |
1440 | } | |
1441 | ||
1442 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
617ba13b | 1443 | printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
1444 | goto out_fail; |
1445 | } | |
1446 | /* | |
1447 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 1448 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 1449 | */ |
617ba13b | 1450 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
1451 | sbi->s_es = es; |
1452 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
1453 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
1454 | goto cantfind_ext4; | |
ac27a0ec DK |
1455 | |
1456 | /* Set defaults before we parse the mount options */ | |
1457 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 1458 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 1459 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 1460 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 1461 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 1462 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 1463 | set_opt(sbi->s_mount_opt, NO_UID32); |
617ba13b | 1464 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 1465 | set_opt(sbi->s_mount_opt, XATTR_USER); |
617ba13b | 1466 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 1467 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
617ba13b MC |
1468 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
1469 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
1470 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
1471 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
1472 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
1473 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
1474 | ||
1475 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 1476 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
617ba13b | 1477 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) |
ac27a0ec DK |
1478 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
1479 | ||
1480 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1481 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1482 | ||
1483 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1484 | ||
1485 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, | |
1486 | NULL, 0)) | |
1487 | goto failed_mount; | |
1488 | ||
1489 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 1490 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 1491 | |
617ba13b MC |
1492 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
1493 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1494 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1495 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 1496 | printk(KERN_WARNING |
617ba13b | 1497 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec DK |
1498 | "running e2fsck is recommended\n"); |
1499 | /* | |
1500 | * Check feature flags regardless of the revision level, since we | |
1501 | * previously didn't change the revision level when setting the flags, | |
1502 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1503 | */ | |
617ba13b | 1504 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 1505 | if (features) { |
617ba13b | 1506 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
ac27a0ec DK |
1507 | "unsupported optional features (%x).\n", |
1508 | sb->s_id, le32_to_cpu(features)); | |
1509 | goto failed_mount; | |
1510 | } | |
617ba13b | 1511 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 1512 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 1513 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
ac27a0ec DK |
1514 | "unsupported optional features (%x).\n", |
1515 | sb->s_id, le32_to_cpu(features)); | |
1516 | goto failed_mount; | |
1517 | } | |
1518 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
1519 | ||
617ba13b MC |
1520 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
1521 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 1522 | printk(KERN_ERR |
617ba13b | 1523 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
1524 | blocksize, sb->s_id); |
1525 | goto failed_mount; | |
1526 | } | |
1527 | ||
1528 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1529 | if (sb->s_blocksize != blocksize) { | |
1530 | /* | |
1531 | * Make sure the blocksize for the filesystem is larger | |
1532 | * than the hardware sectorsize for the machine. | |
1533 | */ | |
1534 | if (blocksize < hblock) { | |
617ba13b | 1535 | printk(KERN_ERR "EXT4-fs: blocksize %d too small for " |
ac27a0ec DK |
1536 | "device blocksize %d.\n", blocksize, hblock); |
1537 | goto failed_mount; | |
1538 | } | |
1539 | ||
1540 | brelse (bh); | |
1541 | sb_set_blocksize(sb, blocksize); | |
3a5b2ecd MC |
1542 | logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1543 | offset = sector_div(logic_sb_block, blocksize); | |
ac27a0ec DK |
1544 | bh = sb_bread(sb, logic_sb_block); |
1545 | if (!bh) { | |
1546 | printk(KERN_ERR | |
617ba13b | 1547 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
1548 | goto failed_mount; |
1549 | } | |
617ba13b | 1550 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 1551 | sbi->s_es = es; |
617ba13b | 1552 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
ac27a0ec | 1553 | printk (KERN_ERR |
617ba13b | 1554 | "EXT4-fs: Magic mismatch, very weird !\n"); |
ac27a0ec DK |
1555 | goto failed_mount; |
1556 | } | |
1557 | } | |
1558 | ||
617ba13b | 1559 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
ac27a0ec | 1560 | |
617ba13b MC |
1561 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
1562 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
1563 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
1564 | } else { |
1565 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1566 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 1567 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
ac27a0ec DK |
1568 | (sbi->s_inode_size & (sbi->s_inode_size - 1)) || |
1569 | (sbi->s_inode_size > blocksize)) { | |
1570 | printk (KERN_ERR | |
617ba13b | 1571 | "EXT4-fs: unsupported inode size: %d\n", |
ac27a0ec DK |
1572 | sbi->s_inode_size); |
1573 | goto failed_mount; | |
1574 | } | |
1575 | } | |
617ba13b | 1576 | sbi->s_frag_size = EXT4_MIN_FRAG_SIZE << |
ac27a0ec DK |
1577 | le32_to_cpu(es->s_log_frag_size); |
1578 | if (blocksize != sbi->s_frag_size) { | |
1579 | printk(KERN_ERR | |
617ba13b | 1580 | "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n", |
ac27a0ec DK |
1581 | sbi->s_frag_size, blocksize); |
1582 | goto failed_mount; | |
1583 | } | |
1584 | sbi->s_frags_per_block = 1; | |
1585 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1586 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1587 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
617ba13b MC |
1588 | if (EXT4_INODE_SIZE(sb) == 0) |
1589 | goto cantfind_ext4; | |
1590 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 1591 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 1592 | goto cantfind_ext4; |
ac27a0ec DK |
1593 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1594 | sbi->s_inodes_per_block; | |
617ba13b | 1595 | sbi->s_desc_per_block = blocksize / sizeof(struct ext4_group_desc); |
ac27a0ec DK |
1596 | sbi->s_sbh = bh; |
1597 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
617ba13b MC |
1598 | sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb)); |
1599 | sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb)); | |
ac27a0ec DK |
1600 | for (i=0; i < 4; i++) |
1601 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1602 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1603 | ||
1604 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1605 | printk (KERN_ERR | |
617ba13b | 1606 | "EXT4-fs: #blocks per group too big: %lu\n", |
ac27a0ec DK |
1607 | sbi->s_blocks_per_group); |
1608 | goto failed_mount; | |
1609 | } | |
1610 | if (sbi->s_frags_per_group > blocksize * 8) { | |
1611 | printk (KERN_ERR | |
617ba13b | 1612 | "EXT4-fs: #fragments per group too big: %lu\n", |
ac27a0ec DK |
1613 | sbi->s_frags_per_group); |
1614 | goto failed_mount; | |
1615 | } | |
1616 | if (sbi->s_inodes_per_group > blocksize * 8) { | |
1617 | printk (KERN_ERR | |
617ba13b | 1618 | "EXT4-fs: #inodes per group too big: %lu\n", |
ac27a0ec DK |
1619 | sbi->s_inodes_per_group); |
1620 | goto failed_mount; | |
1621 | } | |
1622 | ||
1623 | if (le32_to_cpu(es->s_blocks_count) > | |
1624 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
617ba13b | 1625 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
1626 | " too large to mount safely\n", sb->s_id); |
1627 | if (sizeof(sector_t) < 8) | |
617ba13b | 1628 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
1629 | "enabled\n"); |
1630 | goto failed_mount; | |
1631 | } | |
1632 | ||
617ba13b MC |
1633 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
1634 | goto cantfind_ext4; | |
ac27a0ec DK |
1635 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1636 | le32_to_cpu(es->s_first_data_block) - 1) | |
617ba13b MC |
1637 | / EXT4_BLOCKS_PER_GROUP(sb)) + 1; |
1638 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / | |
1639 | EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec DK |
1640 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), |
1641 | GFP_KERNEL); | |
1642 | if (sbi->s_group_desc == NULL) { | |
617ba13b | 1643 | printk (KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
1644 | goto failed_mount; |
1645 | } | |
1646 | ||
1647 | bgl_lock_init(&sbi->s_blockgroup_lock); | |
1648 | ||
1649 | for (i = 0; i < db_count; i++) { | |
1650 | block = descriptor_loc(sb, logic_sb_block, i); | |
1651 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1652 | if (!sbi->s_group_desc[i]) { | |
617ba13b | 1653 | printk (KERN_ERR "EXT4-fs: " |
ac27a0ec DK |
1654 | "can't read group descriptor %d\n", i); |
1655 | db_count = i; | |
1656 | goto failed_mount2; | |
1657 | } | |
1658 | } | |
617ba13b MC |
1659 | if (!ext4_check_descriptors (sb)) { |
1660 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); | |
ac27a0ec DK |
1661 | goto failed_mount2; |
1662 | } | |
1663 | sbi->s_gdb_count = db_count; | |
1664 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1665 | spin_lock_init(&sbi->s_next_gen_lock); | |
1666 | ||
1667 | percpu_counter_init(&sbi->s_freeblocks_counter, | |
617ba13b | 1668 | ext4_count_free_blocks(sb)); |
ac27a0ec | 1669 | percpu_counter_init(&sbi->s_freeinodes_counter, |
617ba13b | 1670 | ext4_count_free_inodes(sb)); |
ac27a0ec | 1671 | percpu_counter_init(&sbi->s_dirs_counter, |
617ba13b | 1672 | ext4_count_dirs(sb)); |
ac27a0ec DK |
1673 | |
1674 | /* per fileystem reservation list head & lock */ | |
1675 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1676 | sbi->s_rsv_window_root = RB_ROOT; | |
1677 | /* Add a single, static dummy reservation to the start of the | |
1678 | * reservation window list --- it gives us a placeholder for | |
1679 | * append-at-start-of-list which makes the allocation logic | |
1680 | * _much_ simpler. */ | |
617ba13b MC |
1681 | sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; |
1682 | sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; | |
ac27a0ec DK |
1683 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
1684 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
617ba13b | 1685 | ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); |
ac27a0ec DK |
1686 | |
1687 | /* | |
1688 | * set up enough so that it can read an inode | |
1689 | */ | |
617ba13b MC |
1690 | sb->s_op = &ext4_sops; |
1691 | sb->s_export_op = &ext4_export_ops; | |
1692 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 1693 | #ifdef CONFIG_QUOTA |
617ba13b MC |
1694 | sb->s_qcop = &ext4_qctl_operations; |
1695 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
1696 | #endif |
1697 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
1698 | ||
1699 | sb->s_root = NULL; | |
1700 | ||
1701 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
1702 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
1703 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
1704 | |
1705 | /* | |
1706 | * The first inode we look at is the journal inode. Don't try | |
1707 | * root first: it may be modified in the journal! | |
1708 | */ | |
1709 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
1710 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
1711 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec DK |
1712 | goto failed_mount3; |
1713 | } else if (journal_inum) { | |
617ba13b | 1714 | if (ext4_create_journal(sb, es, journal_inum)) |
ac27a0ec DK |
1715 | goto failed_mount3; |
1716 | } else { | |
1717 | if (!silent) | |
1718 | printk (KERN_ERR | |
617ba13b | 1719 | "ext4: No journal on filesystem on %s\n", |
ac27a0ec DK |
1720 | sb->s_id); |
1721 | goto failed_mount3; | |
1722 | } | |
1723 | ||
1724 | /* We have now updated the journal if required, so we can | |
1725 | * validate the data journaling mode. */ | |
1726 | switch (test_opt(sb, DATA_FLAGS)) { | |
1727 | case 0: | |
1728 | /* No mode set, assume a default based on the journal | |
1729 | capabilities: ORDERED_DATA if the journal can | |
1730 | cope, else JOURNAL_DATA */ | |
dab291af MC |
1731 | if (jbd2_journal_check_available_features |
1732 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
ac27a0ec DK |
1733 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
1734 | else | |
1735 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
1736 | break; | |
1737 | ||
617ba13b MC |
1738 | case EXT4_MOUNT_ORDERED_DATA: |
1739 | case EXT4_MOUNT_WRITEBACK_DATA: | |
dab291af MC |
1740 | if (!jbd2_journal_check_available_features |
1741 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 1742 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
1743 | "requested data journaling mode\n"); |
1744 | goto failed_mount4; | |
1745 | } | |
1746 | default: | |
1747 | break; | |
1748 | } | |
1749 | ||
1750 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
1751 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
1752 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
1753 | "its supported only with writeback mode\n"); |
1754 | clear_opt(sbi->s_mount_opt, NOBH); | |
1755 | } | |
1756 | } | |
1757 | /* | |
dab291af | 1758 | * The jbd2_journal_load will have done any necessary log recovery, |
ac27a0ec DK |
1759 | * so we can safely mount the rest of the filesystem now. |
1760 | */ | |
1761 | ||
617ba13b | 1762 | root = iget(sb, EXT4_ROOT_INO); |
ac27a0ec DK |
1763 | sb->s_root = d_alloc_root(root); |
1764 | if (!sb->s_root) { | |
617ba13b | 1765 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
ac27a0ec DK |
1766 | iput(root); |
1767 | goto failed_mount4; | |
1768 | } | |
1769 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1770 | dput(sb->s_root); | |
1771 | sb->s_root = NULL; | |
617ba13b | 1772 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
1773 | goto failed_mount4; |
1774 | } | |
1775 | ||
617ba13b | 1776 | ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
ac27a0ec DK |
1777 | /* |
1778 | * akpm: core read_super() calls in here with the superblock locked. | |
1779 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
1780 | * in numerous places. Here we just pop the lock - it's relatively | |
1781 | * harmless, because we are now ready to accept write_super() requests, | |
1782 | * and aviro says that's the only reason for hanging onto the | |
1783 | * superblock lock. | |
1784 | */ | |
617ba13b MC |
1785 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
1786 | ext4_orphan_cleanup(sb, es); | |
1787 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
ac27a0ec | 1788 | if (needs_recovery) |
617ba13b MC |
1789 | printk (KERN_INFO "EXT4-fs: recovery complete.\n"); |
1790 | ext4_mark_recovery_complete(sb, es); | |
1791 | printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", | |
1792 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": | |
1793 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": | |
ac27a0ec DK |
1794 | "writeback"); |
1795 | ||
a86c6181 AT |
1796 | ext4_ext_init(sb); |
1797 | ||
ac27a0ec DK |
1798 | lock_kernel(); |
1799 | return 0; | |
1800 | ||
617ba13b | 1801 | cantfind_ext4: |
ac27a0ec | 1802 | if (!silent) |
617ba13b | 1803 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
1804 | sb->s_id); |
1805 | goto failed_mount; | |
1806 | ||
1807 | failed_mount4: | |
dab291af | 1808 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec DK |
1809 | failed_mount3: |
1810 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1811 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1812 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1813 | failed_mount2: | |
1814 | for (i = 0; i < db_count; i++) | |
1815 | brelse(sbi->s_group_desc[i]); | |
1816 | kfree(sbi->s_group_desc); | |
1817 | failed_mount: | |
1818 | #ifdef CONFIG_QUOTA | |
1819 | for (i = 0; i < MAXQUOTAS; i++) | |
1820 | kfree(sbi->s_qf_names[i]); | |
1821 | #endif | |
617ba13b | 1822 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
1823 | brelse(bh); |
1824 | out_fail: | |
1825 | sb->s_fs_info = NULL; | |
1826 | kfree(sbi); | |
1827 | lock_kernel(); | |
1828 | return -EINVAL; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Setup any per-fs journal parameters now. We'll do this both on | |
1833 | * initial mount, once the journal has been initialised but before we've | |
1834 | * done any recovery; and again on any subsequent remount. | |
1835 | */ | |
617ba13b | 1836 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 1837 | { |
617ba13b | 1838 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1839 | |
1840 | if (sbi->s_commit_interval) | |
1841 | journal->j_commit_interval = sbi->s_commit_interval; | |
617ba13b | 1842 | /* We could also set up an ext4-specific default for the commit |
ac27a0ec DK |
1843 | * interval here, but for now we'll just fall back to the jbd |
1844 | * default. */ | |
1845 | ||
1846 | spin_lock(&journal->j_state_lock); | |
1847 | if (test_opt(sb, BARRIER)) | |
dab291af | 1848 | journal->j_flags |= JBD2_BARRIER; |
ac27a0ec | 1849 | else |
dab291af | 1850 | journal->j_flags &= ~JBD2_BARRIER; |
ac27a0ec DK |
1851 | spin_unlock(&journal->j_state_lock); |
1852 | } | |
1853 | ||
617ba13b | 1854 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
1855 | unsigned int journal_inum) |
1856 | { | |
1857 | struct inode *journal_inode; | |
1858 | journal_t *journal; | |
1859 | ||
1860 | /* First, test for the existence of a valid inode on disk. Bad | |
1861 | * things happen if we iget() an unused inode, as the subsequent | |
1862 | * iput() will try to delete it. */ | |
1863 | ||
1864 | journal_inode = iget(sb, journal_inum); | |
1865 | if (!journal_inode) { | |
617ba13b | 1866 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
1867 | return NULL; |
1868 | } | |
1869 | if (!journal_inode->i_nlink) { | |
1870 | make_bad_inode(journal_inode); | |
1871 | iput(journal_inode); | |
617ba13b | 1872 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
1873 | return NULL; |
1874 | } | |
1875 | ||
1876 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
1877 | journal_inode, journal_inode->i_size); | |
1878 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
617ba13b | 1879 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
1880 | iput(journal_inode); |
1881 | return NULL; | |
1882 | } | |
1883 | ||
dab291af | 1884 | journal = jbd2_journal_init_inode(journal_inode); |
ac27a0ec | 1885 | if (!journal) { |
617ba13b | 1886 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
1887 | iput(journal_inode); |
1888 | return NULL; | |
1889 | } | |
1890 | journal->j_private = sb; | |
617ba13b | 1891 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
1892 | return journal; |
1893 | } | |
1894 | ||
617ba13b | 1895 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
1896 | dev_t j_dev) |
1897 | { | |
1898 | struct buffer_head * bh; | |
1899 | journal_t *journal; | |
617ba13b MC |
1900 | ext4_fsblk_t start; |
1901 | ext4_fsblk_t len; | |
ac27a0ec | 1902 | int hblock, blocksize; |
617ba13b | 1903 | ext4_fsblk_t sb_block; |
ac27a0ec | 1904 | unsigned long offset; |
617ba13b | 1905 | struct ext4_super_block * es; |
ac27a0ec DK |
1906 | struct block_device *bdev; |
1907 | ||
617ba13b | 1908 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
1909 | if (bdev == NULL) |
1910 | return NULL; | |
1911 | ||
1912 | if (bd_claim(bdev, sb)) { | |
1913 | printk(KERN_ERR | |
617ba13b | 1914 | "EXT4: failed to claim external journal device.\n"); |
ac27a0ec DK |
1915 | blkdev_put(bdev); |
1916 | return NULL; | |
1917 | } | |
1918 | ||
1919 | blocksize = sb->s_blocksize; | |
1920 | hblock = bdev_hardsect_size(bdev); | |
1921 | if (blocksize < hblock) { | |
1922 | printk(KERN_ERR | |
617ba13b | 1923 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
1924 | goto out_bdev; |
1925 | } | |
1926 | ||
617ba13b MC |
1927 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
1928 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
1929 | set_blocksize(bdev, blocksize); |
1930 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 1931 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
1932 | "external journal\n"); |
1933 | goto out_bdev; | |
1934 | } | |
1935 | ||
617ba13b MC |
1936 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
1937 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 1938 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
1939 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
1940 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
1941 | "bad superblock\n"); |
1942 | brelse(bh); | |
1943 | goto out_bdev; | |
1944 | } | |
1945 | ||
617ba13b MC |
1946 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
1947 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
1948 | brelse(bh); |
1949 | goto out_bdev; | |
1950 | } | |
1951 | ||
1952 | len = le32_to_cpu(es->s_blocks_count); | |
1953 | start = sb_block + 1; | |
1954 | brelse(bh); /* we're done with the superblock */ | |
1955 | ||
dab291af | 1956 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
ac27a0ec DK |
1957 | start, len, blocksize); |
1958 | if (!journal) { | |
617ba13b | 1959 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
1960 | goto out_bdev; |
1961 | } | |
1962 | journal->j_private = sb; | |
1963 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
1964 | wait_on_buffer(journal->j_sb_buffer); | |
1965 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 1966 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
1967 | goto out_journal; |
1968 | } | |
1969 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 1970 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
1971 | "user (unsupported) - %d\n", |
1972 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
1973 | goto out_journal; | |
1974 | } | |
617ba13b MC |
1975 | EXT4_SB(sb)->journal_bdev = bdev; |
1976 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
1977 | return journal; |
1978 | out_journal: | |
dab291af | 1979 | jbd2_journal_destroy(journal); |
ac27a0ec | 1980 | out_bdev: |
617ba13b | 1981 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
1982 | return NULL; |
1983 | } | |
1984 | ||
617ba13b MC |
1985 | static int ext4_load_journal(struct super_block *sb, |
1986 | struct ext4_super_block *es, | |
ac27a0ec DK |
1987 | unsigned long journal_devnum) |
1988 | { | |
1989 | journal_t *journal; | |
1990 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
1991 | dev_t journal_dev; | |
1992 | int err = 0; | |
1993 | int really_read_only; | |
1994 | ||
1995 | if (journal_devnum && | |
1996 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 1997 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
1998 | "numbers have changed\n"); |
1999 | journal_dev = new_decode_dev(journal_devnum); | |
2000 | } else | |
2001 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
2002 | ||
2003 | really_read_only = bdev_read_only(sb->s_bdev); | |
2004 | ||
2005 | /* | |
2006 | * Are we loading a blank journal or performing recovery after a | |
2007 | * crash? For recovery, we need to check in advance whether we | |
2008 | * can get read-write access to the device. | |
2009 | */ | |
2010 | ||
617ba13b | 2011 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2012 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2013 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2014 | "required on readonly filesystem.\n"); |
2015 | if (really_read_only) { | |
617ba13b | 2016 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2017 | "unavailable, cannot proceed.\n"); |
2018 | return -EROFS; | |
2019 | } | |
617ba13b | 2020 | printk (KERN_INFO "EXT4-fs: write access will " |
ac27a0ec DK |
2021 | "be enabled during recovery.\n"); |
2022 | } | |
2023 | } | |
2024 | ||
2025 | if (journal_inum && journal_dev) { | |
617ba13b | 2026 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2027 | "and inode journals!\n"); |
2028 | return -EINVAL; | |
2029 | } | |
2030 | ||
2031 | if (journal_inum) { | |
617ba13b | 2032 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2033 | return -EINVAL; |
2034 | } else { | |
617ba13b | 2035 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2036 | return -EINVAL; |
2037 | } | |
2038 | ||
2039 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
dab291af | 2040 | err = jbd2_journal_update_format(journal); |
ac27a0ec | 2041 | if (err) { |
617ba13b | 2042 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
dab291af | 2043 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2044 | return err; |
2045 | } | |
2046 | } | |
2047 | ||
617ba13b | 2048 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
dab291af | 2049 | err = jbd2_journal_wipe(journal, !really_read_only); |
ac27a0ec | 2050 | if (!err) |
dab291af | 2051 | err = jbd2_journal_load(journal); |
ac27a0ec DK |
2052 | |
2053 | if (err) { | |
617ba13b | 2054 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
dab291af | 2055 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2056 | return err; |
2057 | } | |
2058 | ||
617ba13b MC |
2059 | EXT4_SB(sb)->s_journal = journal; |
2060 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2061 | |
2062 | if (journal_devnum && | |
2063 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2064 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2065 | sb->s_dirt = 1; | |
2066 | ||
2067 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2068 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2069 | } |
2070 | ||
2071 | return 0; | |
2072 | } | |
2073 | ||
617ba13b MC |
2074 | static int ext4_create_journal(struct super_block * sb, |
2075 | struct ext4_super_block * es, | |
ac27a0ec DK |
2076 | unsigned int journal_inum) |
2077 | { | |
2078 | journal_t *journal; | |
2079 | ||
2080 | if (sb->s_flags & MS_RDONLY) { | |
617ba13b | 2081 | printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
ac27a0ec DK |
2082 | "create journal.\n"); |
2083 | return -EROFS; | |
2084 | } | |
2085 | ||
617ba13b | 2086 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2087 | return -EINVAL; |
2088 | ||
617ba13b | 2089 | printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
ac27a0ec DK |
2090 | journal_inum); |
2091 | ||
dab291af | 2092 | if (jbd2_journal_create(journal)) { |
617ba13b | 2093 | printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
dab291af | 2094 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2095 | return -EIO; |
2096 | } | |
2097 | ||
617ba13b | 2098 | EXT4_SB(sb)->s_journal = journal; |
ac27a0ec | 2099 | |
617ba13b MC |
2100 | ext4_update_dynamic_rev(sb); |
2101 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
2102 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); | |
ac27a0ec DK |
2103 | |
2104 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2105 | sb->s_dirt = 1; | |
2106 | ||
2107 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2108 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2109 | |
2110 | return 0; | |
2111 | } | |
2112 | ||
617ba13b MC |
2113 | static void ext4_commit_super (struct super_block * sb, |
2114 | struct ext4_super_block * es, | |
ac27a0ec DK |
2115 | int sync) |
2116 | { | |
617ba13b | 2117 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
ac27a0ec DK |
2118 | |
2119 | if (!sbh) | |
2120 | return; | |
2121 | es->s_wtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
2122 | es->s_free_blocks_count = cpu_to_le32(ext4_count_free_blocks(sb)); |
2123 | es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); | |
ac27a0ec DK |
2124 | BUFFER_TRACE(sbh, "marking dirty"); |
2125 | mark_buffer_dirty(sbh); | |
2126 | if (sync) | |
2127 | sync_dirty_buffer(sbh); | |
2128 | } | |
2129 | ||
2130 | ||
2131 | /* | |
2132 | * Have we just finished recovery? If so, and if we are mounting (or | |
2133 | * remounting) the filesystem readonly, then we will end up with a | |
2134 | * consistent fs on disk. Record that fact. | |
2135 | */ | |
617ba13b MC |
2136 | static void ext4_mark_recovery_complete(struct super_block * sb, |
2137 | struct ext4_super_block * es) | |
ac27a0ec | 2138 | { |
617ba13b | 2139 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2140 | |
dab291af MC |
2141 | jbd2_journal_lock_updates(journal); |
2142 | jbd2_journal_flush(journal); | |
617ba13b | 2143 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2144 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2145 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2146 | sb->s_dirt = 0; |
617ba13b | 2147 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2148 | } |
dab291af | 2149 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
2150 | } |
2151 | ||
2152 | /* | |
2153 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2154 | * has recorded an error from a previous lifetime, move that error to the | |
2155 | * main filesystem now. | |
2156 | */ | |
617ba13b MC |
2157 | static void ext4_clear_journal_err(struct super_block * sb, |
2158 | struct ext4_super_block * es) | |
ac27a0ec DK |
2159 | { |
2160 | journal_t *journal; | |
2161 | int j_errno; | |
2162 | const char *errstr; | |
2163 | ||
617ba13b | 2164 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2165 | |
2166 | /* | |
2167 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2168 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2169 | */ |
2170 | ||
dab291af | 2171 | j_errno = jbd2_journal_errno(journal); |
ac27a0ec DK |
2172 | if (j_errno) { |
2173 | char nbuf[16]; | |
2174 | ||
617ba13b MC |
2175 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
2176 | ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
ac27a0ec | 2177 | "from previous mount: %s", errstr); |
617ba13b | 2178 | ext4_warning(sb, __FUNCTION__, "Marking fs in need of " |
ac27a0ec DK |
2179 | "filesystem check."); |
2180 | ||
617ba13b MC |
2181 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
2182 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2183 | ext4_commit_super (sb, es, 1); | |
ac27a0ec | 2184 | |
dab291af | 2185 | jbd2_journal_clear_err(journal); |
ac27a0ec DK |
2186 | } |
2187 | } | |
2188 | ||
2189 | /* | |
2190 | * Force the running and committing transactions to commit, | |
2191 | * and wait on the commit. | |
2192 | */ | |
617ba13b | 2193 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
2194 | { |
2195 | journal_t *journal; | |
2196 | int ret; | |
2197 | ||
2198 | if (sb->s_flags & MS_RDONLY) | |
2199 | return 0; | |
2200 | ||
617ba13b | 2201 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2202 | sb->s_dirt = 0; |
617ba13b | 2203 | ret = ext4_journal_force_commit(journal); |
ac27a0ec DK |
2204 | return ret; |
2205 | } | |
2206 | ||
2207 | /* | |
617ba13b | 2208 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec DK |
2209 | * have to propagate any other updates to the superblock on disk at this |
2210 | * point. Just start an async writeback to get the buffers on their way | |
2211 | * to the disk. | |
2212 | * | |
2213 | * This implicitly triggers the writebehind on sync(). | |
2214 | */ | |
2215 | ||
617ba13b | 2216 | static void ext4_write_super (struct super_block * sb) |
ac27a0ec DK |
2217 | { |
2218 | if (mutex_trylock(&sb->s_lock) != 0) | |
2219 | BUG(); | |
2220 | sb->s_dirt = 0; | |
2221 | } | |
2222 | ||
617ba13b | 2223 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec DK |
2224 | { |
2225 | tid_t target; | |
2226 | ||
2227 | sb->s_dirt = 0; | |
dab291af | 2228 | if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
ac27a0ec | 2229 | if (wait) |
dab291af | 2230 | jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); |
ac27a0ec DK |
2231 | } |
2232 | return 0; | |
2233 | } | |
2234 | ||
2235 | /* | |
2236 | * LVM calls this function before a (read-only) snapshot is created. This | |
2237 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2238 | */ | |
617ba13b | 2239 | static void ext4_write_super_lockfs(struct super_block *sb) |
ac27a0ec DK |
2240 | { |
2241 | sb->s_dirt = 0; | |
2242 | ||
2243 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 2244 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2245 | |
2246 | /* Now we set up the journal barrier. */ | |
dab291af MC |
2247 | jbd2_journal_lock_updates(journal); |
2248 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
2249 | |
2250 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b MC |
2251 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2252 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec DK |
2253 | } |
2254 | } | |
2255 | ||
2256 | /* | |
2257 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2258 | * flag here, even though the filesystem is not technically dirty yet. | |
2259 | */ | |
617ba13b | 2260 | static void ext4_unlockfs(struct super_block *sb) |
ac27a0ec DK |
2261 | { |
2262 | if (!(sb->s_flags & MS_RDONLY)) { | |
2263 | lock_super(sb); | |
2264 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
2265 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2266 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 2267 | unlock_super(sb); |
dab291af | 2268 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
2269 | } |
2270 | } | |
2271 | ||
617ba13b | 2272 | static int ext4_remount (struct super_block * sb, int * flags, char * data) |
ac27a0ec | 2273 | { |
617ba13b MC |
2274 | struct ext4_super_block * es; |
2275 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2276 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 2277 | unsigned long old_sb_flags; |
617ba13b | 2278 | struct ext4_mount_options old_opts; |
ac27a0ec DK |
2279 | int err; |
2280 | #ifdef CONFIG_QUOTA | |
2281 | int i; | |
2282 | #endif | |
2283 | ||
2284 | /* Store the original options */ | |
2285 | old_sb_flags = sb->s_flags; | |
2286 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2287 | old_opts.s_resuid = sbi->s_resuid; | |
2288 | old_opts.s_resgid = sbi->s_resgid; | |
2289 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2290 | #ifdef CONFIG_QUOTA | |
2291 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2292 | for (i = 0; i < MAXQUOTAS; i++) | |
2293 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2294 | #endif | |
2295 | ||
2296 | /* | |
2297 | * Allow the "check" option to be passed as a remount option. | |
2298 | */ | |
2299 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { | |
2300 | err = -EINVAL; | |
2301 | goto restore_opts; | |
2302 | } | |
2303 | ||
617ba13b MC |
2304 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
2305 | ext4_abort(sb, __FUNCTION__, "Abort forced by user"); | |
ac27a0ec DK |
2306 | |
2307 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2308 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
2309 | |
2310 | es = sbi->s_es; | |
2311 | ||
617ba13b | 2312 | ext4_init_journal_params(sb, sbi->s_journal); |
ac27a0ec DK |
2313 | |
2314 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
2315 | n_blocks_count > le32_to_cpu(es->s_blocks_count)) { | |
617ba13b | 2316 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
2317 | err = -EROFS; |
2318 | goto restore_opts; | |
2319 | } | |
2320 | ||
2321 | if (*flags & MS_RDONLY) { | |
2322 | /* | |
2323 | * First of all, the unconditional stuff we have to do | |
2324 | * to disable replay of the journal when we next remount | |
2325 | */ | |
2326 | sb->s_flags |= MS_RDONLY; | |
2327 | ||
2328 | /* | |
2329 | * OK, test if we are remounting a valid rw partition | |
2330 | * readonly, and if so set the rdonly flag and then | |
2331 | * mark the partition as valid again. | |
2332 | */ | |
617ba13b MC |
2333 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
2334 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
2335 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
2336 | ||
617ba13b | 2337 | ext4_mark_recovery_complete(sb, es); |
ac27a0ec DK |
2338 | } else { |
2339 | __le32 ret; | |
617ba13b MC |
2340 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
2341 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
2342 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec DK |
2343 | "remount RDWR because of unsupported " |
2344 | "optional features (%x).\n", | |
2345 | sb->s_id, le32_to_cpu(ret)); | |
2346 | err = -EROFS; | |
2347 | goto restore_opts; | |
2348 | } | |
2349 | /* | |
2350 | * Mounting a RDONLY partition read-write, so reread | |
2351 | * and store the current valid flag. (It may have | |
2352 | * been changed by e2fsck since we originally mounted | |
2353 | * the partition.) | |
2354 | */ | |
617ba13b | 2355 | ext4_clear_journal_err(sb, es); |
ac27a0ec | 2356 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 2357 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 2358 | goto restore_opts; |
617ba13b | 2359 | if (!ext4_setup_super (sb, es, 0)) |
ac27a0ec DK |
2360 | sb->s_flags &= ~MS_RDONLY; |
2361 | } | |
2362 | } | |
2363 | #ifdef CONFIG_QUOTA | |
2364 | /* Release old quota file names */ | |
2365 | for (i = 0; i < MAXQUOTAS; i++) | |
2366 | if (old_opts.s_qf_names[i] && | |
2367 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2368 | kfree(old_opts.s_qf_names[i]); | |
2369 | #endif | |
2370 | return 0; | |
2371 | restore_opts: | |
2372 | sb->s_flags = old_sb_flags; | |
2373 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2374 | sbi->s_resuid = old_opts.s_resuid; | |
2375 | sbi->s_resgid = old_opts.s_resgid; | |
2376 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2377 | #ifdef CONFIG_QUOTA | |
2378 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2379 | for (i = 0; i < MAXQUOTAS; i++) { | |
2380 | if (sbi->s_qf_names[i] && | |
2381 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2382 | kfree(sbi->s_qf_names[i]); | |
2383 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2384 | } | |
2385 | #endif | |
2386 | return err; | |
2387 | } | |
2388 | ||
617ba13b | 2389 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) |
ac27a0ec DK |
2390 | { |
2391 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
2392 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2393 | struct ext4_super_block *es = sbi->s_es; | |
2394 | ext4_fsblk_t overhead; | |
ac27a0ec DK |
2395 | int i; |
2396 | ||
2397 | if (test_opt (sb, MINIX_DF)) | |
2398 | overhead = 0; | |
2399 | else { | |
2400 | unsigned long ngroups; | |
617ba13b | 2401 | ngroups = EXT4_SB(sb)->s_groups_count; |
ac27a0ec DK |
2402 | smp_rmb(); |
2403 | ||
2404 | /* | |
2405 | * Compute the overhead (FS structures) | |
2406 | */ | |
2407 | ||
2408 | /* | |
2409 | * All of the blocks before first_data_block are | |
2410 | * overhead | |
2411 | */ | |
2412 | overhead = le32_to_cpu(es->s_first_data_block); | |
2413 | ||
2414 | /* | |
2415 | * Add the overhead attributed to the superblock and | |
2416 | * block group descriptors. If the sparse superblocks | |
2417 | * feature is turned on, then not all groups have this. | |
2418 | */ | |
2419 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
2420 | overhead += ext4_bg_has_super(sb, i) + |
2421 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
2422 | cond_resched(); |
2423 | } | |
2424 | ||
2425 | /* | |
2426 | * Every block group has an inode bitmap, a block | |
2427 | * bitmap, and an inode table. | |
2428 | */ | |
617ba13b | 2429 | overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group)); |
ac27a0ec DK |
2430 | } |
2431 | ||
617ba13b | 2432 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec DK |
2433 | buf->f_bsize = sb->s_blocksize; |
2434 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; | |
2435 | buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter); | |
2436 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); | |
2437 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
2438 | buf->f_bavail = 0; | |
2439 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
2440 | buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter); | |
617ba13b | 2441 | buf->f_namelen = EXT4_NAME_LEN; |
ac27a0ec DK |
2442 | return 0; |
2443 | } | |
2444 | ||
2445 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2446 | * is locked for write. Otherwise the are possible deadlocks: | |
2447 | * Process 1 Process 2 | |
617ba13b | 2448 | * ext4_create() quota_sync() |
dab291af | 2449 | * jbd2_journal_start() write_dquot() |
ac27a0ec | 2450 | * DQUOT_INIT() down(dqio_mutex) |
dab291af | 2451 | * down(dqio_mutex) jbd2_journal_start() |
ac27a0ec DK |
2452 | * |
2453 | */ | |
2454 | ||
2455 | #ifdef CONFIG_QUOTA | |
2456 | ||
2457 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2458 | { | |
2459 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2460 | } | |
2461 | ||
617ba13b | 2462 | static int ext4_dquot_initialize(struct inode *inode, int type) |
ac27a0ec DK |
2463 | { |
2464 | handle_t *handle; | |
2465 | int ret, err; | |
2466 | ||
2467 | /* We may create quota structure so we need to reserve enough blocks */ | |
617ba13b | 2468 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2469 | if (IS_ERR(handle)) |
2470 | return PTR_ERR(handle); | |
2471 | ret = dquot_initialize(inode, type); | |
617ba13b | 2472 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2473 | if (!ret) |
2474 | ret = err; | |
2475 | return ret; | |
2476 | } | |
2477 | ||
617ba13b | 2478 | static int ext4_dquot_drop(struct inode *inode) |
ac27a0ec DK |
2479 | { |
2480 | handle_t *handle; | |
2481 | int ret, err; | |
2482 | ||
2483 | /* We may delete quota structure so we need to reserve enough blocks */ | |
617ba13b | 2484 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2485 | if (IS_ERR(handle)) |
2486 | return PTR_ERR(handle); | |
2487 | ret = dquot_drop(inode); | |
617ba13b | 2488 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2489 | if (!ret) |
2490 | ret = err; | |
2491 | return ret; | |
2492 | } | |
2493 | ||
617ba13b | 2494 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
2495 | { |
2496 | int ret, err; | |
2497 | handle_t *handle; | |
2498 | struct inode *inode; | |
2499 | ||
2500 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
2501 | handle = ext4_journal_start(inode, |
2502 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2503 | if (IS_ERR(handle)) |
2504 | return PTR_ERR(handle); | |
2505 | ret = dquot_commit(dquot); | |
617ba13b | 2506 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2507 | if (!ret) |
2508 | ret = err; | |
2509 | return ret; | |
2510 | } | |
2511 | ||
617ba13b | 2512 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
2513 | { |
2514 | int ret, err; | |
2515 | handle_t *handle; | |
2516 | ||
617ba13b MC |
2517 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2518 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2519 | if (IS_ERR(handle)) |
2520 | return PTR_ERR(handle); | |
2521 | ret = dquot_acquire(dquot); | |
617ba13b | 2522 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2523 | if (!ret) |
2524 | ret = err; | |
2525 | return ret; | |
2526 | } | |
2527 | ||
617ba13b | 2528 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
2529 | { |
2530 | int ret, err; | |
2531 | handle_t *handle; | |
2532 | ||
617ba13b MC |
2533 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2534 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2535 | if (IS_ERR(handle)) |
2536 | return PTR_ERR(handle); | |
2537 | ret = dquot_release(dquot); | |
617ba13b | 2538 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2539 | if (!ret) |
2540 | ret = err; | |
2541 | return ret; | |
2542 | } | |
2543 | ||
617ba13b | 2544 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec DK |
2545 | { |
2546 | /* Are we journalling quotas? */ | |
617ba13b MC |
2547 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
2548 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 2549 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 2550 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
2551 | } else { |
2552 | return dquot_mark_dquot_dirty(dquot); | |
2553 | } | |
2554 | } | |
2555 | ||
617ba13b | 2556 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
2557 | { |
2558 | int ret, err; | |
2559 | handle_t *handle; | |
2560 | ||
2561 | /* Data block + inode block */ | |
617ba13b | 2562 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
2563 | if (IS_ERR(handle)) |
2564 | return PTR_ERR(handle); | |
2565 | ret = dquot_commit_info(sb, type); | |
617ba13b | 2566 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2567 | if (!ret) |
2568 | ret = err; | |
2569 | return ret; | |
2570 | } | |
2571 | ||
2572 | /* | |
2573 | * Turn on quotas during mount time - we need to find | |
2574 | * the quota file and such... | |
2575 | */ | |
617ba13b | 2576 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 2577 | { |
617ba13b MC |
2578 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
2579 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
2580 | } |
2581 | ||
2582 | /* | |
2583 | * Standard function to be called on quota_on | |
2584 | */ | |
617ba13b | 2585 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
ac27a0ec DK |
2586 | char *path) |
2587 | { | |
2588 | int err; | |
2589 | struct nameidata nd; | |
2590 | ||
2591 | if (!test_opt(sb, QUOTA)) | |
2592 | return -EINVAL; | |
2593 | /* Not journalling quota? */ | |
617ba13b MC |
2594 | if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && |
2595 | !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) | |
ac27a0ec DK |
2596 | return vfs_quota_on(sb, type, format_id, path); |
2597 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
2598 | if (err) | |
2599 | return err; | |
2600 | /* Quotafile not on the same filesystem? */ | |
2601 | if (nd.mnt->mnt_sb != sb) { | |
2602 | path_release(&nd); | |
2603 | return -EXDEV; | |
2604 | } | |
2605 | /* Quotafile not of fs root? */ | |
2606 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
2607 | printk(KERN_WARNING | |
617ba13b | 2608 | "EXT4-fs: Quota file not on filesystem root. " |
ac27a0ec DK |
2609 | "Journalled quota will not work.\n"); |
2610 | path_release(&nd); | |
2611 | return vfs_quota_on(sb, type, format_id, path); | |
2612 | } | |
2613 | ||
2614 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
2615 | * acquiring the locks... As quota files are never truncated and quota code | |
2616 | * itself serializes the operations (and noone else should touch the files) | |
2617 | * we don't have to be afraid of races */ | |
617ba13b | 2618 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
2619 | size_t len, loff_t off) |
2620 | { | |
2621 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2622 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2623 | int err = 0; |
2624 | int offset = off & (sb->s_blocksize - 1); | |
2625 | int tocopy; | |
2626 | size_t toread; | |
2627 | struct buffer_head *bh; | |
2628 | loff_t i_size = i_size_read(inode); | |
2629 | ||
2630 | if (off > i_size) | |
2631 | return 0; | |
2632 | if (off+len > i_size) | |
2633 | len = i_size-off; | |
2634 | toread = len; | |
2635 | while (toread > 0) { | |
2636 | tocopy = sb->s_blocksize - offset < toread ? | |
2637 | sb->s_blocksize - offset : toread; | |
617ba13b | 2638 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
2639 | if (err) |
2640 | return err; | |
2641 | if (!bh) /* A hole? */ | |
2642 | memset(data, 0, tocopy); | |
2643 | else | |
2644 | memcpy(data, bh->b_data+offset, tocopy); | |
2645 | brelse(bh); | |
2646 | offset = 0; | |
2647 | toread -= tocopy; | |
2648 | data += tocopy; | |
2649 | blk++; | |
2650 | } | |
2651 | return len; | |
2652 | } | |
2653 | ||
2654 | /* Write to quotafile (we know the transaction is already started and has | |
2655 | * enough credits) */ | |
617ba13b | 2656 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
2657 | const char *data, size_t len, loff_t off) |
2658 | { | |
2659 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2660 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2661 | int err = 0; |
2662 | int offset = off & (sb->s_blocksize - 1); | |
2663 | int tocopy; | |
617ba13b | 2664 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
2665 | size_t towrite = len; |
2666 | struct buffer_head *bh; | |
2667 | handle_t *handle = journal_current_handle(); | |
2668 | ||
2669 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); | |
2670 | while (towrite > 0) { | |
2671 | tocopy = sb->s_blocksize - offset < towrite ? | |
2672 | sb->s_blocksize - offset : towrite; | |
617ba13b | 2673 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
2674 | if (!bh) |
2675 | goto out; | |
2676 | if (journal_quota) { | |
617ba13b | 2677 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2678 | if (err) { |
2679 | brelse(bh); | |
2680 | goto out; | |
2681 | } | |
2682 | } | |
2683 | lock_buffer(bh); | |
2684 | memcpy(bh->b_data+offset, data, tocopy); | |
2685 | flush_dcache_page(bh->b_page); | |
2686 | unlock_buffer(bh); | |
2687 | if (journal_quota) | |
617ba13b | 2688 | err = ext4_journal_dirty_metadata(handle, bh); |
ac27a0ec DK |
2689 | else { |
2690 | /* Always do at least ordered writes for quotas */ | |
617ba13b | 2691 | err = ext4_journal_dirty_data(handle, bh); |
ac27a0ec DK |
2692 | mark_buffer_dirty(bh); |
2693 | } | |
2694 | brelse(bh); | |
2695 | if (err) | |
2696 | goto out; | |
2697 | offset = 0; | |
2698 | towrite -= tocopy; | |
2699 | data += tocopy; | |
2700 | blk++; | |
2701 | } | |
2702 | out: | |
2703 | if (len == towrite) | |
2704 | return err; | |
2705 | if (inode->i_size < off+len-towrite) { | |
2706 | i_size_write(inode, off+len-towrite); | |
617ba13b | 2707 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec DK |
2708 | } |
2709 | inode->i_version++; | |
2710 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
617ba13b | 2711 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
2712 | mutex_unlock(&inode->i_mutex); |
2713 | return len - towrite; | |
2714 | } | |
2715 | ||
2716 | #endif | |
2717 | ||
617ba13b | 2718 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
2719 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
2720 | { | |
617ba13b | 2721 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
2722 | } |
2723 | ||
617ba13b | 2724 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 2725 | .owner = THIS_MODULE, |
617ba13b MC |
2726 | .name = "ext4dev", |
2727 | .get_sb = ext4_get_sb, | |
ac27a0ec DK |
2728 | .kill_sb = kill_block_super, |
2729 | .fs_flags = FS_REQUIRES_DEV, | |
2730 | }; | |
2731 | ||
617ba13b | 2732 | static int __init init_ext4_fs(void) |
ac27a0ec | 2733 | { |
617ba13b | 2734 | int err = init_ext4_xattr(); |
ac27a0ec DK |
2735 | if (err) |
2736 | return err; | |
2737 | err = init_inodecache(); | |
2738 | if (err) | |
2739 | goto out1; | |
617ba13b | 2740 | err = register_filesystem(&ext4dev_fs_type); |
ac27a0ec DK |
2741 | if (err) |
2742 | goto out; | |
2743 | return 0; | |
2744 | out: | |
2745 | destroy_inodecache(); | |
2746 | out1: | |
617ba13b | 2747 | exit_ext4_xattr(); |
ac27a0ec DK |
2748 | return err; |
2749 | } | |
2750 | ||
617ba13b | 2751 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 2752 | { |
617ba13b | 2753 | unregister_filesystem(&ext4dev_fs_type); |
ac27a0ec | 2754 | destroy_inodecache(); |
617ba13b | 2755 | exit_ext4_xattr(); |
ac27a0ec DK |
2756 | } |
2757 | ||
2758 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
617ba13b | 2759 | MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
ac27a0ec | 2760 | MODULE_LICENSE("GPL"); |
617ba13b MC |
2761 | module_init(init_ext4_fs) |
2762 | module_exit(exit_ext4_fs) |