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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 | 64 | |
bd81d8ee LV |
65 | |
66 | ext4_fsblk_t ext4_block_bitmap(struct ext4_group_desc *bg) | |
67 | { | |
68 | return le32_to_cpu(bg->bg_block_bitmap) | | |
69 | ((ext4_fsblk_t)le16_to_cpu(bg->bg_block_bitmap_hi) << 32); | |
70 | } | |
71 | ||
72 | ext4_fsblk_t ext4_inode_bitmap(struct ext4_group_desc *bg) | |
73 | { | |
74 | return le32_to_cpu(bg->bg_inode_bitmap) | | |
75 | ((ext4_fsblk_t)le16_to_cpu(bg->bg_inode_bitmap_hi) << 32); | |
76 | } | |
77 | ||
78 | ext4_fsblk_t ext4_inode_table(struct ext4_group_desc *bg) | |
79 | { | |
80 | return le32_to_cpu(bg->bg_inode_table) | | |
81 | ((ext4_fsblk_t)le16_to_cpu(bg->bg_inode_table_hi) << 32); | |
82 | } | |
83 | ||
84 | void ext4_block_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
85 | { | |
86 | bg->bg_block_bitmap = cpu_to_le32((u32)blk); | |
87 | bg->bg_block_bitmap_hi = cpu_to_le16(blk >> 32); | |
88 | } | |
89 | ||
90 | void ext4_inode_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
91 | { | |
92 | bg->bg_inode_bitmap = cpu_to_le32((u32)blk); | |
93 | bg->bg_inode_bitmap_hi = cpu_to_le16(blk >> 32); | |
94 | } | |
95 | ||
96 | void ext4_inode_table_set(struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
97 | { | |
98 | bg->bg_inode_table = cpu_to_le32((u32)blk); | |
99 | bg->bg_inode_table_hi = cpu_to_le16(blk >> 32); | |
100 | } | |
101 | ||
ac27a0ec | 102 | /* |
dab291af | 103 | * Wrappers for jbd2_journal_start/end. |
ac27a0ec DK |
104 | * |
105 | * The only special thing we need to do here is to make sure that all | |
106 | * journal_end calls result in the superblock being marked dirty, so | |
107 | * that sync() will call the filesystem's write_super callback if | |
108 | * appropriate. | |
109 | */ | |
617ba13b | 110 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
111 | { |
112 | journal_t *journal; | |
113 | ||
114 | if (sb->s_flags & MS_RDONLY) | |
115 | return ERR_PTR(-EROFS); | |
116 | ||
117 | /* Special case here: if the journal has aborted behind our | |
118 | * backs (eg. EIO in the commit thread), then we still need to | |
119 | * take the FS itself readonly cleanly. */ | |
617ba13b | 120 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 121 | if (is_journal_aborted(journal)) { |
617ba13b | 122 | ext4_abort(sb, __FUNCTION__, |
ac27a0ec DK |
123 | "Detected aborted journal"); |
124 | return ERR_PTR(-EROFS); | |
125 | } | |
126 | ||
dab291af | 127 | return jbd2_journal_start(journal, nblocks); |
ac27a0ec DK |
128 | } |
129 | ||
130 | /* | |
131 | * The only special thing we need to do here is to make sure that all | |
dab291af | 132 | * jbd2_journal_stop calls result in the superblock being marked dirty, so |
ac27a0ec DK |
133 | * that sync() will call the filesystem's write_super callback if |
134 | * appropriate. | |
135 | */ | |
617ba13b | 136 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
137 | { |
138 | struct super_block *sb; | |
139 | int err; | |
140 | int rc; | |
141 | ||
142 | sb = handle->h_transaction->t_journal->j_private; | |
143 | err = handle->h_err; | |
dab291af | 144 | rc = jbd2_journal_stop(handle); |
ac27a0ec DK |
145 | |
146 | if (!err) | |
147 | err = rc; | |
148 | if (err) | |
617ba13b | 149 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
150 | return err; |
151 | } | |
152 | ||
617ba13b | 153 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
154 | struct buffer_head *bh, handle_t *handle, int err) |
155 | { | |
156 | char nbuf[16]; | |
617ba13b | 157 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec DK |
158 | |
159 | if (bh) | |
160 | BUFFER_TRACE(bh, "abort"); | |
161 | ||
162 | if (!handle->h_err) | |
163 | handle->h_err = err; | |
164 | ||
165 | if (is_handle_aborted(handle)) | |
166 | return; | |
167 | ||
168 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
169 | caller, errstr, err_fn); | |
170 | ||
dab291af | 171 | jbd2_journal_abort_handle(handle); |
ac27a0ec DK |
172 | } |
173 | ||
174 | /* Deal with the reporting of failure conditions on a filesystem such as | |
175 | * inconsistencies detected or read IO failures. | |
176 | * | |
177 | * On ext2, we can store the error state of the filesystem in the | |
617ba13b | 178 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
179 | * write ordering constraints on the superblock which prevent us from |
180 | * writing it out straight away; and given that the journal is about to | |
181 | * be aborted, we can't rely on the current, or future, transactions to | |
182 | * write out the superblock safely. | |
183 | * | |
dab291af | 184 | * We'll just use the jbd2_journal_abort() error code to record an error in |
ac27a0ec DK |
185 | * the journal instead. On recovery, the journal will compain about |
186 | * that error until we've noted it down and cleared it. | |
187 | */ | |
188 | ||
617ba13b | 189 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 190 | { |
617ba13b | 191 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 192 | |
617ba13b MC |
193 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
194 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
195 | |
196 | if (sb->s_flags & MS_RDONLY) | |
197 | return; | |
198 | ||
199 | if (!test_opt (sb, ERRORS_CONT)) { | |
617ba13b | 200 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 201 | |
617ba13b | 202 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec | 203 | if (journal) |
dab291af | 204 | jbd2_journal_abort(journal, -EIO); |
ac27a0ec DK |
205 | } |
206 | if (test_opt (sb, ERRORS_RO)) { | |
207 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
208 | sb->s_flags |= MS_RDONLY; | |
209 | } | |
617ba13b | 210 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 211 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 212 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
213 | sb->s_id); |
214 | } | |
215 | ||
617ba13b | 216 | void ext4_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
217 | const char * fmt, ...) |
218 | { | |
219 | va_list args; | |
220 | ||
221 | va_start(args, fmt); | |
617ba13b | 222 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
223 | vprintk(fmt, args); |
224 | printk("\n"); | |
225 | va_end(args); | |
226 | ||
617ba13b | 227 | ext4_handle_error(sb); |
ac27a0ec DK |
228 | } |
229 | ||
617ba13b | 230 | static const char *ext4_decode_error(struct super_block * sb, int errno, |
ac27a0ec DK |
231 | char nbuf[16]) |
232 | { | |
233 | char *errstr = NULL; | |
234 | ||
235 | switch (errno) { | |
236 | case -EIO: | |
237 | errstr = "IO failure"; | |
238 | break; | |
239 | case -ENOMEM: | |
240 | errstr = "Out of memory"; | |
241 | break; | |
242 | case -EROFS: | |
dab291af | 243 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) |
ac27a0ec DK |
244 | errstr = "Journal has aborted"; |
245 | else | |
246 | errstr = "Readonly filesystem"; | |
247 | break; | |
248 | default: | |
249 | /* If the caller passed in an extra buffer for unknown | |
250 | * errors, textualise them now. Else we just return | |
251 | * NULL. */ | |
252 | if (nbuf) { | |
253 | /* Check for truncated error codes... */ | |
254 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
255 | errstr = nbuf; | |
256 | } | |
257 | break; | |
258 | } | |
259 | ||
260 | return errstr; | |
261 | } | |
262 | ||
617ba13b | 263 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
264 | * automatically and invokes the appropriate error response. */ |
265 | ||
617ba13b | 266 | void __ext4_std_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
267 | int errno) |
268 | { | |
269 | char nbuf[16]; | |
270 | const char *errstr; | |
271 | ||
272 | /* Special case: if the error is EROFS, and we're not already | |
273 | * inside a transaction, then there's really no point in logging | |
274 | * an error. */ | |
275 | if (errno == -EROFS && journal_current_handle() == NULL && | |
276 | (sb->s_flags & MS_RDONLY)) | |
277 | return; | |
278 | ||
617ba13b MC |
279 | errstr = ext4_decode_error(sb, errno, nbuf); |
280 | printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", | |
ac27a0ec DK |
281 | sb->s_id, function, errstr); |
282 | ||
617ba13b | 283 | ext4_handle_error(sb); |
ac27a0ec DK |
284 | } |
285 | ||
286 | /* | |
617ba13b | 287 | * ext4_abort is a much stronger failure handler than ext4_error. The |
ac27a0ec DK |
288 | * abort function may be used to deal with unrecoverable failures such |
289 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
290 | * | |
291 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
292 | * unless the error response on the fs has been set to panic in which | |
293 | * case we take the easy way out and panic immediately. | |
294 | */ | |
295 | ||
617ba13b | 296 | void ext4_abort (struct super_block * sb, const char * function, |
ac27a0ec DK |
297 | const char * fmt, ...) |
298 | { | |
299 | va_list args; | |
300 | ||
617ba13b | 301 | printk (KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
302 | |
303 | va_start(args, fmt); | |
617ba13b | 304 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
305 | vprintk(fmt, args); |
306 | printk("\n"); | |
307 | va_end(args); | |
308 | ||
309 | if (test_opt(sb, ERRORS_PANIC)) | |
617ba13b | 310 | panic("EXT4-fs panic from previous error\n"); |
ac27a0ec DK |
311 | |
312 | if (sb->s_flags & MS_RDONLY) | |
313 | return; | |
314 | ||
315 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
617ba13b | 316 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
ac27a0ec | 317 | sb->s_flags |= MS_RDONLY; |
617ba13b | 318 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
dab291af | 319 | jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
ac27a0ec DK |
320 | } |
321 | ||
617ba13b | 322 | void ext4_warning (struct super_block * sb, const char * function, |
ac27a0ec DK |
323 | const char * fmt, ...) |
324 | { | |
325 | va_list args; | |
326 | ||
327 | va_start(args, fmt); | |
617ba13b | 328 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
ac27a0ec DK |
329 | sb->s_id, function); |
330 | vprintk(fmt, args); | |
331 | printk("\n"); | |
332 | va_end(args); | |
333 | } | |
334 | ||
617ba13b | 335 | void ext4_update_dynamic_rev(struct super_block *sb) |
ac27a0ec | 336 | { |
617ba13b | 337 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 338 | |
617ba13b | 339 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
ac27a0ec DK |
340 | return; |
341 | ||
617ba13b | 342 | ext4_warning(sb, __FUNCTION__, |
ac27a0ec DK |
343 | "updating to rev %d because of new feature flag, " |
344 | "running e2fsck is recommended", | |
617ba13b | 345 | EXT4_DYNAMIC_REV); |
ac27a0ec | 346 | |
617ba13b MC |
347 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
348 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
349 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
ac27a0ec DK |
350 | /* leave es->s_feature_*compat flags alone */ |
351 | /* es->s_uuid will be set by e2fsck if empty */ | |
352 | ||
353 | /* | |
354 | * The rest of the superblock fields should be zero, and if not it | |
355 | * means they are likely already in use, so leave them alone. We | |
356 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
357 | */ | |
358 | } | |
359 | ||
360 | /* | |
361 | * Open the external journal device | |
362 | */ | |
617ba13b | 363 | static struct block_device *ext4_blkdev_get(dev_t dev) |
ac27a0ec DK |
364 | { |
365 | struct block_device *bdev; | |
366 | char b[BDEVNAME_SIZE]; | |
367 | ||
368 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
369 | if (IS_ERR(bdev)) | |
370 | goto fail; | |
371 | return bdev; | |
372 | ||
373 | fail: | |
617ba13b | 374 | printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", |
ac27a0ec DK |
375 | __bdevname(dev, b), PTR_ERR(bdev)); |
376 | return NULL; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Release the journal device | |
381 | */ | |
617ba13b | 382 | static int ext4_blkdev_put(struct block_device *bdev) |
ac27a0ec DK |
383 | { |
384 | bd_release(bdev); | |
385 | return blkdev_put(bdev); | |
386 | } | |
387 | ||
617ba13b | 388 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
ac27a0ec DK |
389 | { |
390 | struct block_device *bdev; | |
391 | int ret = -ENODEV; | |
392 | ||
393 | bdev = sbi->journal_bdev; | |
394 | if (bdev) { | |
617ba13b | 395 | ret = ext4_blkdev_put(bdev); |
ac27a0ec DK |
396 | sbi->journal_bdev = NULL; |
397 | } | |
398 | return ret; | |
399 | } | |
400 | ||
401 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
402 | { | |
617ba13b | 403 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
404 | } |
405 | ||
617ba13b | 406 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
ac27a0ec DK |
407 | { |
408 | struct list_head *l; | |
409 | ||
410 | printk(KERN_ERR "sb orphan head is %d\n", | |
411 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
412 | ||
413 | printk(KERN_ERR "sb_info orphan list:\n"); | |
414 | list_for_each(l, &sbi->s_orphan) { | |
415 | struct inode *inode = orphan_list_entry(l); | |
416 | printk(KERN_ERR " " | |
417 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
418 | inode->i_sb->s_id, inode->i_ino, inode, | |
419 | inode->i_mode, inode->i_nlink, | |
420 | NEXT_ORPHAN(inode)); | |
421 | } | |
422 | } | |
423 | ||
617ba13b | 424 | static void ext4_put_super (struct super_block * sb) |
ac27a0ec | 425 | { |
617ba13b MC |
426 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
427 | struct ext4_super_block *es = sbi->s_es; | |
ac27a0ec DK |
428 | int i; |
429 | ||
a86c6181 | 430 | ext4_ext_release(sb); |
617ba13b | 431 | ext4_xattr_put_super(sb); |
dab291af | 432 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec | 433 | if (!(sb->s_flags & MS_RDONLY)) { |
617ba13b | 434 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec DK |
435 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
436 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
437 | mark_buffer_dirty(sbi->s_sbh); | |
617ba13b | 438 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
439 | } |
440 | ||
441 | for (i = 0; i < sbi->s_gdb_count; i++) | |
442 | brelse(sbi->s_group_desc[i]); | |
443 | kfree(sbi->s_group_desc); | |
444 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
445 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
446 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
447 | brelse(sbi->s_sbh); | |
448 | #ifdef CONFIG_QUOTA | |
449 | for (i = 0; i < MAXQUOTAS; i++) | |
450 | kfree(sbi->s_qf_names[i]); | |
451 | #endif | |
452 | ||
453 | /* Debugging code just in case the in-memory inode orphan list | |
454 | * isn't empty. The on-disk one can be non-empty if we've | |
455 | * detected an error and taken the fs readonly, but the | |
456 | * in-memory list had better be clean by this point. */ | |
457 | if (!list_empty(&sbi->s_orphan)) | |
458 | dump_orphan_list(sb, sbi); | |
459 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
460 | ||
461 | invalidate_bdev(sb->s_bdev, 0); | |
462 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { | |
463 | /* | |
464 | * Invalidate the journal device's buffers. We don't want them | |
465 | * floating about in memory - the physical journal device may | |
466 | * hotswapped, and it breaks the `ro-after' testing code. | |
467 | */ | |
468 | sync_blockdev(sbi->journal_bdev); | |
469 | invalidate_bdev(sbi->journal_bdev, 0); | |
617ba13b | 470 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
471 | } |
472 | sb->s_fs_info = NULL; | |
473 | kfree(sbi); | |
474 | return; | |
475 | } | |
476 | ||
617ba13b | 477 | static kmem_cache_t *ext4_inode_cachep; |
ac27a0ec DK |
478 | |
479 | /* | |
480 | * Called inside transaction, so use GFP_NOFS | |
481 | */ | |
617ba13b | 482 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 483 | { |
617ba13b | 484 | struct ext4_inode_info *ei; |
ac27a0ec | 485 | |
617ba13b | 486 | ei = kmem_cache_alloc(ext4_inode_cachep, SLAB_NOFS); |
ac27a0ec DK |
487 | if (!ei) |
488 | return NULL; | |
617ba13b MC |
489 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
490 | ei->i_acl = EXT4_ACL_NOT_CACHED; | |
491 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
492 | #endif |
493 | ei->i_block_alloc_info = NULL; | |
494 | ei->vfs_inode.i_version = 1; | |
a86c6181 | 495 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
ac27a0ec DK |
496 | return &ei->vfs_inode; |
497 | } | |
498 | ||
617ba13b | 499 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 500 | { |
617ba13b | 501 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
502 | } |
503 | ||
504 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
505 | { | |
617ba13b | 506 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec DK |
507 | |
508 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
509 | SLAB_CTOR_CONSTRUCTOR) { | |
510 | INIT_LIST_HEAD(&ei->i_orphan); | |
617ba13b | 511 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
512 | init_rwsem(&ei->xattr_sem); |
513 | #endif | |
514 | mutex_init(&ei->truncate_mutex); | |
515 | inode_init_once(&ei->vfs_inode); | |
516 | } | |
517 | } | |
518 | ||
519 | static int init_inodecache(void) | |
520 | { | |
617ba13b MC |
521 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
522 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
523 | 0, (SLAB_RECLAIM_ACCOUNT| |
524 | SLAB_MEM_SPREAD), | |
525 | init_once, NULL); | |
617ba13b | 526 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
527 | return -ENOMEM; |
528 | return 0; | |
529 | } | |
530 | ||
531 | static void destroy_inodecache(void) | |
532 | { | |
617ba13b | 533 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
534 | } |
535 | ||
617ba13b | 536 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 537 | { |
617ba13b MC |
538 | struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; |
539 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
540 | if (EXT4_I(inode)->i_acl && | |
541 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
542 | posix_acl_release(EXT4_I(inode)->i_acl); | |
543 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
544 | } | |
545 | if (EXT4_I(inode)->i_default_acl && | |
546 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
547 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
548 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
549 | } |
550 | #endif | |
617ba13b MC |
551 | ext4_discard_reservation(inode); |
552 | EXT4_I(inode)->i_block_alloc_info = NULL; | |
ac27a0ec DK |
553 | if (unlikely(rsv)) |
554 | kfree(rsv); | |
555 | } | |
556 | ||
617ba13b | 557 | static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) |
ac27a0ec DK |
558 | { |
559 | #if defined(CONFIG_QUOTA) | |
617ba13b | 560 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
561 | |
562 | if (sbi->s_jquota_fmt) | |
563 | seq_printf(seq, ",jqfmt=%s", | |
564 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
565 | ||
566 | if (sbi->s_qf_names[USRQUOTA]) | |
567 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
568 | ||
569 | if (sbi->s_qf_names[GRPQUOTA]) | |
570 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
571 | ||
617ba13b | 572 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
573 | seq_puts(seq, ",usrquota"); |
574 | ||
617ba13b | 575 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
576 | seq_puts(seq, ",grpquota"); |
577 | #endif | |
578 | } | |
579 | ||
617ba13b | 580 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec DK |
581 | { |
582 | struct super_block *sb = vfs->mnt_sb; | |
583 | ||
617ba13b | 584 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 585 | seq_puts(seq, ",data=journal"); |
617ba13b | 586 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 587 | seq_puts(seq, ",data=ordered"); |
617ba13b | 588 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
589 | seq_puts(seq, ",data=writeback"); |
590 | ||
617ba13b | 591 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
592 | |
593 | return 0; | |
594 | } | |
595 | ||
596 | ||
617ba13b | 597 | static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp) |
ac27a0ec DK |
598 | { |
599 | __u32 *objp = vobjp; | |
600 | unsigned long ino = objp[0]; | |
601 | __u32 generation = objp[1]; | |
602 | struct inode *inode; | |
603 | struct dentry *result; | |
604 | ||
617ba13b | 605 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 606 | return ERR_PTR(-ESTALE); |
617ba13b | 607 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
608 | return ERR_PTR(-ESTALE); |
609 | ||
610 | /* iget isn't really right if the inode is currently unallocated!! | |
611 | * | |
617ba13b | 612 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
613 | * deleted, so we should be safe. |
614 | * | |
615 | * Currently we don't know the generation for parent directory, so | |
616 | * a generation of 0 means "accept any" | |
617 | */ | |
618 | inode = iget(sb, ino); | |
619 | if (inode == NULL) | |
620 | return ERR_PTR(-ENOMEM); | |
621 | if (is_bad_inode(inode) || | |
622 | (generation && inode->i_generation != generation)) { | |
623 | iput(inode); | |
624 | return ERR_PTR(-ESTALE); | |
625 | } | |
626 | /* now to find a dentry. | |
627 | * If possible, get a well-connected one | |
628 | */ | |
629 | result = d_alloc_anon(inode); | |
630 | if (!result) { | |
631 | iput(inode); | |
632 | return ERR_PTR(-ENOMEM); | |
633 | } | |
634 | return result; | |
635 | } | |
636 | ||
637 | #ifdef CONFIG_QUOTA | |
638 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") | |
639 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
640 | ||
617ba13b MC |
641 | static int ext4_dquot_initialize(struct inode *inode, int type); |
642 | static int ext4_dquot_drop(struct inode *inode); | |
643 | static int ext4_write_dquot(struct dquot *dquot); | |
644 | static int ext4_acquire_dquot(struct dquot *dquot); | |
645 | static int ext4_release_dquot(struct dquot *dquot); | |
646 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
647 | static int ext4_write_info(struct super_block *sb, int type); | |
648 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
649 | static int ext4_quota_on_mount(struct super_block *sb, int type); | |
650 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 651 | size_t len, loff_t off); |
617ba13b | 652 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
653 | const char *data, size_t len, loff_t off); |
654 | ||
617ba13b MC |
655 | static struct dquot_operations ext4_quota_operations = { |
656 | .initialize = ext4_dquot_initialize, | |
657 | .drop = ext4_dquot_drop, | |
ac27a0ec DK |
658 | .alloc_space = dquot_alloc_space, |
659 | .alloc_inode = dquot_alloc_inode, | |
660 | .free_space = dquot_free_space, | |
661 | .free_inode = dquot_free_inode, | |
662 | .transfer = dquot_transfer, | |
617ba13b MC |
663 | .write_dquot = ext4_write_dquot, |
664 | .acquire_dquot = ext4_acquire_dquot, | |
665 | .release_dquot = ext4_release_dquot, | |
666 | .mark_dirty = ext4_mark_dquot_dirty, | |
667 | .write_info = ext4_write_info | |
ac27a0ec DK |
668 | }; |
669 | ||
617ba13b MC |
670 | static struct quotactl_ops ext4_qctl_operations = { |
671 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
672 | .quota_off = vfs_quota_off, |
673 | .quota_sync = vfs_quota_sync, | |
674 | .get_info = vfs_get_dqinfo, | |
675 | .set_info = vfs_set_dqinfo, | |
676 | .get_dqblk = vfs_get_dqblk, | |
677 | .set_dqblk = vfs_set_dqblk | |
678 | }; | |
679 | #endif | |
680 | ||
617ba13b MC |
681 | static struct super_operations ext4_sops = { |
682 | .alloc_inode = ext4_alloc_inode, | |
683 | .destroy_inode = ext4_destroy_inode, | |
684 | .read_inode = ext4_read_inode, | |
685 | .write_inode = ext4_write_inode, | |
686 | .dirty_inode = ext4_dirty_inode, | |
687 | .delete_inode = ext4_delete_inode, | |
688 | .put_super = ext4_put_super, | |
689 | .write_super = ext4_write_super, | |
690 | .sync_fs = ext4_sync_fs, | |
691 | .write_super_lockfs = ext4_write_super_lockfs, | |
692 | .unlockfs = ext4_unlockfs, | |
693 | .statfs = ext4_statfs, | |
694 | .remount_fs = ext4_remount, | |
695 | .clear_inode = ext4_clear_inode, | |
696 | .show_options = ext4_show_options, | |
ac27a0ec | 697 | #ifdef CONFIG_QUOTA |
617ba13b MC |
698 | .quota_read = ext4_quota_read, |
699 | .quota_write = ext4_quota_write, | |
ac27a0ec DK |
700 | #endif |
701 | }; | |
702 | ||
617ba13b MC |
703 | static struct export_operations ext4_export_ops = { |
704 | .get_parent = ext4_get_parent, | |
705 | .get_dentry = ext4_get_dentry, | |
ac27a0ec DK |
706 | }; |
707 | ||
708 | enum { | |
709 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
710 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
711 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
712 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
713 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
714 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, | |
715 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
716 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
717 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
718 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
a86c6181 | 719 | Opt_grpquota, Opt_extents, |
ac27a0ec DK |
720 | }; |
721 | ||
722 | static match_table_t tokens = { | |
723 | {Opt_bsd_df, "bsddf"}, | |
724 | {Opt_minix_df, "minixdf"}, | |
725 | {Opt_grpid, "grpid"}, | |
726 | {Opt_grpid, "bsdgroups"}, | |
727 | {Opt_nogrpid, "nogrpid"}, | |
728 | {Opt_nogrpid, "sysvgroups"}, | |
729 | {Opt_resgid, "resgid=%u"}, | |
730 | {Opt_resuid, "resuid=%u"}, | |
731 | {Opt_sb, "sb=%u"}, | |
732 | {Opt_err_cont, "errors=continue"}, | |
733 | {Opt_err_panic, "errors=panic"}, | |
734 | {Opt_err_ro, "errors=remount-ro"}, | |
735 | {Opt_nouid32, "nouid32"}, | |
736 | {Opt_nocheck, "nocheck"}, | |
737 | {Opt_nocheck, "check=none"}, | |
738 | {Opt_debug, "debug"}, | |
739 | {Opt_oldalloc, "oldalloc"}, | |
740 | {Opt_orlov, "orlov"}, | |
741 | {Opt_user_xattr, "user_xattr"}, | |
742 | {Opt_nouser_xattr, "nouser_xattr"}, | |
743 | {Opt_acl, "acl"}, | |
744 | {Opt_noacl, "noacl"}, | |
745 | {Opt_reservation, "reservation"}, | |
746 | {Opt_noreservation, "noreservation"}, | |
747 | {Opt_noload, "noload"}, | |
748 | {Opt_nobh, "nobh"}, | |
749 | {Opt_bh, "bh"}, | |
750 | {Opt_commit, "commit=%u"}, | |
751 | {Opt_journal_update, "journal=update"}, | |
752 | {Opt_journal_inum, "journal=%u"}, | |
753 | {Opt_journal_dev, "journal_dev=%u"}, | |
754 | {Opt_abort, "abort"}, | |
755 | {Opt_data_journal, "data=journal"}, | |
756 | {Opt_data_ordered, "data=ordered"}, | |
757 | {Opt_data_writeback, "data=writeback"}, | |
758 | {Opt_offusrjquota, "usrjquota="}, | |
759 | {Opt_usrjquota, "usrjquota=%s"}, | |
760 | {Opt_offgrpjquota, "grpjquota="}, | |
761 | {Opt_grpjquota, "grpjquota=%s"}, | |
762 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
763 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
764 | {Opt_grpquota, "grpquota"}, | |
765 | {Opt_noquota, "noquota"}, | |
766 | {Opt_quota, "quota"}, | |
767 | {Opt_usrquota, "usrquota"}, | |
768 | {Opt_barrier, "barrier=%u"}, | |
a86c6181 | 769 | {Opt_extents, "extents"}, |
ac27a0ec DK |
770 | {Opt_err, NULL}, |
771 | {Opt_resize, "resize"}, | |
772 | }; | |
773 | ||
617ba13b | 774 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 775 | { |
617ba13b | 776 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
777 | char *options = (char *) *data; |
778 | ||
779 | if (!options || strncmp(options, "sb=", 3) != 0) | |
780 | return 1; /* Default location */ | |
781 | options += 3; | |
617ba13b | 782 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
783 | sb_block = simple_strtoul(options, &options, 0); |
784 | if (*options && *options != ',') { | |
617ba13b | 785 | printk("EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
786 | (char *) *data); |
787 | return 1; | |
788 | } | |
789 | if (*options == ',') | |
790 | options++; | |
791 | *data = (void *) options; | |
792 | return sb_block; | |
793 | } | |
794 | ||
795 | static int parse_options (char *options, struct super_block *sb, | |
796 | unsigned int *inum, unsigned long *journal_devnum, | |
617ba13b | 797 | ext4_fsblk_t *n_blocks_count, int is_remount) |
ac27a0ec | 798 | { |
617ba13b | 799 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
800 | char * p; |
801 | substring_t args[MAX_OPT_ARGS]; | |
802 | int data_opt = 0; | |
803 | int option; | |
804 | #ifdef CONFIG_QUOTA | |
805 | int qtype; | |
806 | char *qname; | |
807 | #endif | |
808 | ||
809 | if (!options) | |
810 | return 1; | |
811 | ||
812 | while ((p = strsep (&options, ",")) != NULL) { | |
813 | int token; | |
814 | if (!*p) | |
815 | continue; | |
816 | ||
817 | token = match_token(p, tokens, args); | |
818 | switch (token) { | |
819 | case Opt_bsd_df: | |
820 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
821 | break; | |
822 | case Opt_minix_df: | |
823 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
824 | break; | |
825 | case Opt_grpid: | |
826 | set_opt (sbi->s_mount_opt, GRPID); | |
827 | break; | |
828 | case Opt_nogrpid: | |
829 | clear_opt (sbi->s_mount_opt, GRPID); | |
830 | break; | |
831 | case Opt_resuid: | |
832 | if (match_int(&args[0], &option)) | |
833 | return 0; | |
834 | sbi->s_resuid = option; | |
835 | break; | |
836 | case Opt_resgid: | |
837 | if (match_int(&args[0], &option)) | |
838 | return 0; | |
839 | sbi->s_resgid = option; | |
840 | break; | |
841 | case Opt_sb: | |
842 | /* handled by get_sb_block() instead of here */ | |
843 | /* *sb_block = match_int(&args[0]); */ | |
844 | break; | |
845 | case Opt_err_panic: | |
846 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
847 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
848 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
849 | break; | |
850 | case Opt_err_ro: | |
851 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
852 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
853 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
854 | break; | |
855 | case Opt_err_cont: | |
856 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
857 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
858 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
859 | break; | |
860 | case Opt_nouid32: | |
861 | set_opt (sbi->s_mount_opt, NO_UID32); | |
862 | break; | |
863 | case Opt_nocheck: | |
864 | clear_opt (sbi->s_mount_opt, CHECK); | |
865 | break; | |
866 | case Opt_debug: | |
867 | set_opt (sbi->s_mount_opt, DEBUG); | |
868 | break; | |
869 | case Opt_oldalloc: | |
870 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
871 | break; | |
872 | case Opt_orlov: | |
873 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
874 | break; | |
617ba13b | 875 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
876 | case Opt_user_xattr: |
877 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
878 | break; | |
879 | case Opt_nouser_xattr: | |
880 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
881 | break; | |
882 | #else | |
883 | case Opt_user_xattr: | |
884 | case Opt_nouser_xattr: | |
617ba13b | 885 | printk("EXT4 (no)user_xattr options not supported\n"); |
ac27a0ec DK |
886 | break; |
887 | #endif | |
617ba13b | 888 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
ac27a0ec DK |
889 | case Opt_acl: |
890 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
891 | break; | |
892 | case Opt_noacl: | |
893 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
894 | break; | |
895 | #else | |
896 | case Opt_acl: | |
897 | case Opt_noacl: | |
617ba13b | 898 | printk("EXT4 (no)acl options not supported\n"); |
ac27a0ec DK |
899 | break; |
900 | #endif | |
901 | case Opt_reservation: | |
902 | set_opt(sbi->s_mount_opt, RESERVATION); | |
903 | break; | |
904 | case Opt_noreservation: | |
905 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
906 | break; | |
907 | case Opt_journal_update: | |
908 | /* @@@ FIXME */ | |
909 | /* Eventually we will want to be able to create | |
910 | a journal file here. For now, only allow the | |
911 | user to specify an existing inode to be the | |
912 | journal file. */ | |
913 | if (is_remount) { | |
617ba13b | 914 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
915 | "journal on remount\n"); |
916 | return 0; | |
917 | } | |
918 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
919 | break; | |
920 | case Opt_journal_inum: | |
921 | if (is_remount) { | |
617ba13b | 922 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
923 | "journal on remount\n"); |
924 | return 0; | |
925 | } | |
926 | if (match_int(&args[0], &option)) | |
927 | return 0; | |
928 | *inum = option; | |
929 | break; | |
930 | case Opt_journal_dev: | |
931 | if (is_remount) { | |
617ba13b | 932 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
933 | "journal on remount\n"); |
934 | return 0; | |
935 | } | |
936 | if (match_int(&args[0], &option)) | |
937 | return 0; | |
938 | *journal_devnum = option; | |
939 | break; | |
940 | case Opt_noload: | |
941 | set_opt (sbi->s_mount_opt, NOLOAD); | |
942 | break; | |
943 | case Opt_commit: | |
944 | if (match_int(&args[0], &option)) | |
945 | return 0; | |
946 | if (option < 0) | |
947 | return 0; | |
948 | if (option == 0) | |
949 | option = JBD_DEFAULT_MAX_COMMIT_AGE; | |
950 | sbi->s_commit_interval = HZ * option; | |
951 | break; | |
952 | case Opt_data_journal: | |
617ba13b | 953 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
954 | goto datacheck; |
955 | case Opt_data_ordered: | |
617ba13b | 956 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
957 | goto datacheck; |
958 | case Opt_data_writeback: | |
617ba13b | 959 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
960 | datacheck: |
961 | if (is_remount) { | |
617ba13b | 962 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
963 | != data_opt) { |
964 | printk(KERN_ERR | |
617ba13b | 965 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
966 | "mode on remount\n"); |
967 | return 0; | |
968 | } | |
969 | } else { | |
617ba13b | 970 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
971 | sbi->s_mount_opt |= data_opt; |
972 | } | |
973 | break; | |
974 | #ifdef CONFIG_QUOTA | |
975 | case Opt_usrjquota: | |
976 | qtype = USRQUOTA; | |
977 | goto set_qf_name; | |
978 | case Opt_grpjquota: | |
979 | qtype = GRPQUOTA; | |
980 | set_qf_name: | |
981 | if (sb_any_quota_enabled(sb)) { | |
982 | printk(KERN_ERR | |
617ba13b | 983 | "EXT4-fs: Cannot change journalled " |
ac27a0ec DK |
984 | "quota options when quota turned on.\n"); |
985 | return 0; | |
986 | } | |
987 | qname = match_strdup(&args[0]); | |
988 | if (!qname) { | |
989 | printk(KERN_ERR | |
617ba13b | 990 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
991 | "storing quotafile name.\n"); |
992 | return 0; | |
993 | } | |
994 | if (sbi->s_qf_names[qtype] && | |
995 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
996 | printk(KERN_ERR | |
617ba13b | 997 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
998 | "specified.\n", QTYPE2NAME(qtype)); |
999 | kfree(qname); | |
1000 | return 0; | |
1001 | } | |
1002 | sbi->s_qf_names[qtype] = qname; | |
1003 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
1004 | printk(KERN_ERR | |
617ba13b | 1005 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
1006 | "filesystem root.\n"); |
1007 | kfree(sbi->s_qf_names[qtype]); | |
1008 | sbi->s_qf_names[qtype] = NULL; | |
1009 | return 0; | |
1010 | } | |
1011 | set_opt(sbi->s_mount_opt, QUOTA); | |
1012 | break; | |
1013 | case Opt_offusrjquota: | |
1014 | qtype = USRQUOTA; | |
1015 | goto clear_qf_name; | |
1016 | case Opt_offgrpjquota: | |
1017 | qtype = GRPQUOTA; | |
1018 | clear_qf_name: | |
1019 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1020 | printk(KERN_ERR "EXT4-fs: Cannot change " |
ac27a0ec DK |
1021 | "journalled quota options when " |
1022 | "quota turned on.\n"); | |
1023 | return 0; | |
1024 | } | |
1025 | /* | |
1026 | * The space will be released later when all options | |
1027 | * are confirmed to be correct | |
1028 | */ | |
1029 | sbi->s_qf_names[qtype] = NULL; | |
1030 | break; | |
1031 | case Opt_jqfmt_vfsold: | |
1032 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
1033 | break; | |
1034 | case Opt_jqfmt_vfsv0: | |
1035 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
1036 | break; | |
1037 | case Opt_quota: | |
1038 | case Opt_usrquota: | |
1039 | set_opt(sbi->s_mount_opt, QUOTA); | |
1040 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1041 | break; | |
1042 | case Opt_grpquota: | |
1043 | set_opt(sbi->s_mount_opt, QUOTA); | |
1044 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1045 | break; | |
1046 | case Opt_noquota: | |
1047 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1048 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1049 | "options when quota turned on.\n"); |
1050 | return 0; | |
1051 | } | |
1052 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1053 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1054 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1055 | break; | |
1056 | #else | |
1057 | case Opt_quota: | |
1058 | case Opt_usrquota: | |
1059 | case Opt_grpquota: | |
1060 | case Opt_usrjquota: | |
1061 | case Opt_grpjquota: | |
1062 | case Opt_offusrjquota: | |
1063 | case Opt_offgrpjquota: | |
1064 | case Opt_jqfmt_vfsold: | |
1065 | case Opt_jqfmt_vfsv0: | |
1066 | printk(KERN_ERR | |
617ba13b | 1067 | "EXT4-fs: journalled quota options not " |
ac27a0ec DK |
1068 | "supported.\n"); |
1069 | break; | |
1070 | case Opt_noquota: | |
1071 | break; | |
1072 | #endif | |
1073 | case Opt_abort: | |
1074 | set_opt(sbi->s_mount_opt, ABORT); | |
1075 | break; | |
1076 | case Opt_barrier: | |
1077 | if (match_int(&args[0], &option)) | |
1078 | return 0; | |
1079 | if (option) | |
1080 | set_opt(sbi->s_mount_opt, BARRIER); | |
1081 | else | |
1082 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1083 | break; | |
1084 | case Opt_ignore: | |
1085 | break; | |
1086 | case Opt_resize: | |
1087 | if (!is_remount) { | |
617ba13b | 1088 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1089 | "for remount\n"); |
1090 | return 0; | |
1091 | } | |
1092 | if (match_int(&args[0], &option) != 0) | |
1093 | return 0; | |
1094 | *n_blocks_count = option; | |
1095 | break; | |
1096 | case Opt_nobh: | |
1097 | set_opt(sbi->s_mount_opt, NOBH); | |
1098 | break; | |
1099 | case Opt_bh: | |
1100 | clear_opt(sbi->s_mount_opt, NOBH); | |
1101 | break; | |
a86c6181 AT |
1102 | case Opt_extents: |
1103 | set_opt (sbi->s_mount_opt, EXTENTS); | |
1104 | break; | |
ac27a0ec DK |
1105 | default: |
1106 | printk (KERN_ERR | |
617ba13b | 1107 | "EXT4-fs: Unrecognized mount option \"%s\" " |
ac27a0ec DK |
1108 | "or missing value\n", p); |
1109 | return 0; | |
1110 | } | |
1111 | } | |
1112 | #ifdef CONFIG_QUOTA | |
1113 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1114 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1115 | sbi->s_qf_names[USRQUOTA]) |
1116 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1117 | ||
617ba13b | 1118 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1119 | sbi->s_qf_names[GRPQUOTA]) |
1120 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1121 | ||
1122 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1123 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1124 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1125 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1126 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1127 | "format mixing.\n"); |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | if (!sbi->s_jquota_fmt) { | |
617ba13b | 1132 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1133 | "not specified.\n"); |
1134 | return 0; | |
1135 | } | |
1136 | } else { | |
1137 | if (sbi->s_jquota_fmt) { | |
617ba13b | 1138 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1139 | "specified with no journalling " |
1140 | "enabled.\n"); | |
1141 | return 0; | |
1142 | } | |
1143 | } | |
1144 | #endif | |
1145 | return 1; | |
1146 | } | |
1147 | ||
617ba13b | 1148 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1149 | int read_only) |
1150 | { | |
617ba13b | 1151 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1152 | int res = 0; |
1153 | ||
617ba13b MC |
1154 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
1155 | printk (KERN_ERR "EXT4-fs warning: revision level too high, " | |
ac27a0ec DK |
1156 | "forcing read-only mode\n"); |
1157 | res = MS_RDONLY; | |
1158 | } | |
1159 | if (read_only) | |
1160 | return res; | |
617ba13b MC |
1161 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
1162 | printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " | |
ac27a0ec | 1163 | "running e2fsck is recommended\n"); |
617ba13b | 1164 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
ac27a0ec | 1165 | printk (KERN_WARNING |
617ba13b | 1166 | "EXT4-fs warning: mounting fs with errors, " |
ac27a0ec DK |
1167 | "running e2fsck is recommended\n"); |
1168 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1169 | le16_to_cpu(es->s_mnt_count) >= | |
1170 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1171 | printk (KERN_WARNING | |
617ba13b | 1172 | "EXT4-fs warning: maximal mount count reached, " |
ac27a0ec DK |
1173 | "running e2fsck is recommended\n"); |
1174 | else if (le32_to_cpu(es->s_checkinterval) && | |
1175 | (le32_to_cpu(es->s_lastcheck) + | |
1176 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1177 | printk (KERN_WARNING | |
617ba13b | 1178 | "EXT4-fs warning: checktime reached, " |
ac27a0ec DK |
1179 | "running e2fsck is recommended\n"); |
1180 | #if 0 | |
1181 | /* @@@ We _will_ want to clear the valid bit if we find | |
1182 | inconsistencies, to force a fsck at reboot. But for | |
1183 | a plain journaled filesystem we can keep it set as | |
1184 | valid forever! :) */ | |
617ba13b | 1185 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); |
ac27a0ec DK |
1186 | #endif |
1187 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
617ba13b | 1188 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
ac27a0ec DK |
1189 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); |
1190 | es->s_mtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
1191 | ext4_update_dynamic_rev(sb); |
1192 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1193 | |
617ba13b | 1194 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1195 | if (test_opt(sb, DEBUG)) |
617ba13b | 1196 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
ac27a0ec DK |
1197 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1198 | sb->s_blocksize, | |
1199 | sbi->s_groups_count, | |
617ba13b MC |
1200 | EXT4_BLOCKS_PER_GROUP(sb), |
1201 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1202 | sbi->s_mount_opt); |
1203 | ||
617ba13b MC |
1204 | printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); |
1205 | if (EXT4_SB(sb)->s_journal->j_inode == NULL) { | |
ac27a0ec DK |
1206 | char b[BDEVNAME_SIZE]; |
1207 | ||
1208 | printk("external journal on %s\n", | |
617ba13b | 1209 | bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); |
ac27a0ec DK |
1210 | } else { |
1211 | printk("internal journal\n"); | |
1212 | } | |
1213 | return res; | |
1214 | } | |
1215 | ||
1216 | /* Called at mount-time, super-block is locked */ | |
617ba13b | 1217 | static int ext4_check_descriptors (struct super_block * sb) |
ac27a0ec | 1218 | { |
617ba13b MC |
1219 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1220 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1221 | ext4_fsblk_t last_block; | |
bd81d8ee LV |
1222 | ext4_fsblk_t block_bitmap; |
1223 | ext4_fsblk_t inode_bitmap; | |
1224 | ext4_fsblk_t inode_table; | |
617ba13b | 1225 | struct ext4_group_desc * gdp = NULL; |
ac27a0ec DK |
1226 | int desc_block = 0; |
1227 | int i; | |
1228 | ||
617ba13b | 1229 | ext4_debug ("Checking group descriptors"); |
ac27a0ec DK |
1230 | |
1231 | for (i = 0; i < sbi->s_groups_count; i++) | |
1232 | { | |
1233 | if (i == sbi->s_groups_count - 1) | |
bd81d8ee | 1234 | last_block = ext4_blocks_count(sbi->s_es) - 1; |
ac27a0ec DK |
1235 | else |
1236 | last_block = first_block + | |
617ba13b | 1237 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1238 | |
617ba13b MC |
1239 | if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) |
1240 | gdp = (struct ext4_group_desc *) | |
ac27a0ec | 1241 | sbi->s_group_desc[desc_block++]->b_data; |
bd81d8ee LV |
1242 | block_bitmap = ext4_block_bitmap(gdp); |
1243 | if (block_bitmap < first_block || block_bitmap > last_block) | |
ac27a0ec | 1244 | { |
617ba13b | 1245 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1246 | "Block bitmap for group %d" |
2ae02107 | 1247 | " not in group (block %llu)!", |
bd81d8ee | 1248 | i, block_bitmap); |
ac27a0ec DK |
1249 | return 0; |
1250 | } | |
bd81d8ee LV |
1251 | inode_bitmap = ext4_inode_bitmap(gdp); |
1252 | if (inode_bitmap < first_block || inode_bitmap > last_block) | |
ac27a0ec | 1253 | { |
617ba13b | 1254 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1255 | "Inode bitmap for group %d" |
2ae02107 | 1256 | " not in group (block %llu)!", |
bd81d8ee | 1257 | i, inode_bitmap); |
ac27a0ec DK |
1258 | return 0; |
1259 | } | |
bd81d8ee LV |
1260 | inode_table = ext4_inode_table(gdp); |
1261 | if (inode_table < first_block || | |
1262 | inode_table + sbi->s_itb_per_group > last_block) | |
ac27a0ec | 1263 | { |
617ba13b | 1264 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1265 | "Inode table for group %d" |
2ae02107 | 1266 | " not in group (block %llu)!", |
bd81d8ee | 1267 | i, inode_table); |
ac27a0ec DK |
1268 | return 0; |
1269 | } | |
617ba13b | 1270 | first_block += EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1271 | gdp++; |
1272 | } | |
1273 | ||
bd81d8ee | 1274 | ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); |
617ba13b | 1275 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
1276 | return 1; |
1277 | } | |
1278 | ||
1279 | ||
617ba13b | 1280 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1281 | * the superblock) which were deleted from all directories, but held open by |
1282 | * a process at the time of a crash. We walk the list and try to delete these | |
1283 | * inodes at recovery time (only with a read-write filesystem). | |
1284 | * | |
1285 | * In order to keep the orphan inode chain consistent during traversal (in | |
1286 | * case of crash during recovery), we link each inode into the superblock | |
1287 | * orphan list_head and handle it the same way as an inode deletion during | |
1288 | * normal operation (which journals the operations for us). | |
1289 | * | |
1290 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1291 | * accidentally point at an in-use or already deleted inode. The worst that | |
1292 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1293 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1294 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1295 | * inode cleanup for us, so we can safely abort without any further action. | |
1296 | */ | |
617ba13b MC |
1297 | static void ext4_orphan_cleanup (struct super_block * sb, |
1298 | struct ext4_super_block * es) | |
ac27a0ec DK |
1299 | { |
1300 | unsigned int s_flags = sb->s_flags; | |
1301 | int nr_orphans = 0, nr_truncates = 0; | |
1302 | #ifdef CONFIG_QUOTA | |
1303 | int i; | |
1304 | #endif | |
1305 | if (!es->s_last_orphan) { | |
1306 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1307 | return; | |
1308 | } | |
1309 | ||
617ba13b | 1310 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1311 | if (es->s_last_orphan) |
1312 | jbd_debug(1, "Errors on filesystem, " | |
1313 | "clearing orphan list.\n"); | |
1314 | es->s_last_orphan = 0; | |
1315 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1316 | return; | |
1317 | } | |
1318 | ||
1319 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1320 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1321 | sb->s_id); |
1322 | sb->s_flags &= ~MS_RDONLY; | |
1323 | } | |
1324 | #ifdef CONFIG_QUOTA | |
1325 | /* Needed for iput() to work correctly and not trash data */ | |
1326 | sb->s_flags |= MS_ACTIVE; | |
1327 | /* Turn on quotas so that they are updated correctly */ | |
1328 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1329 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1330 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1331 | if (ret < 0) |
1332 | printk(KERN_ERR | |
617ba13b | 1333 | "EXT4-fs: Cannot turn on journalled " |
ac27a0ec DK |
1334 | "quota: error %d\n", ret); |
1335 | } | |
1336 | } | |
1337 | #endif | |
1338 | ||
1339 | while (es->s_last_orphan) { | |
1340 | struct inode *inode; | |
1341 | ||
1342 | if (!(inode = | |
617ba13b | 1343 | ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { |
ac27a0ec DK |
1344 | es->s_last_orphan = 0; |
1345 | break; | |
1346 | } | |
1347 | ||
617ba13b | 1348 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1349 | DQUOT_INIT(inode); |
1350 | if (inode->i_nlink) { | |
1351 | printk(KERN_DEBUG | |
1352 | "%s: truncating inode %lu to %Ld bytes\n", | |
1353 | __FUNCTION__, inode->i_ino, inode->i_size); | |
1354 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", | |
1355 | inode->i_ino, inode->i_size); | |
617ba13b | 1356 | ext4_truncate(inode); |
ac27a0ec DK |
1357 | nr_truncates++; |
1358 | } else { | |
1359 | printk(KERN_DEBUG | |
1360 | "%s: deleting unreferenced inode %lu\n", | |
1361 | __FUNCTION__, inode->i_ino); | |
1362 | jbd_debug(2, "deleting unreferenced inode %lu\n", | |
1363 | inode->i_ino); | |
1364 | nr_orphans++; | |
1365 | } | |
1366 | iput(inode); /* The delete magic happens here! */ | |
1367 | } | |
1368 | ||
1369 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1370 | ||
1371 | if (nr_orphans) | |
617ba13b | 1372 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1373 | sb->s_id, PLURAL(nr_orphans)); |
1374 | if (nr_truncates) | |
617ba13b | 1375 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1376 | sb->s_id, PLURAL(nr_truncates)); |
1377 | #ifdef CONFIG_QUOTA | |
1378 | /* Turn quotas off */ | |
1379 | for (i = 0; i < MAXQUOTAS; i++) { | |
1380 | if (sb_dqopt(sb)->files[i]) | |
1381 | vfs_quota_off(sb, i); | |
1382 | } | |
1383 | #endif | |
1384 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1385 | } | |
1386 | ||
1387 | #define log2(n) ffz(~(n)) | |
1388 | ||
1389 | /* | |
1390 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
1391 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
1392 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
1393 | */ | |
617ba13b | 1394 | static loff_t ext4_max_size(int bits) |
ac27a0ec | 1395 | { |
617ba13b | 1396 | loff_t res = EXT4_NDIR_BLOCKS; |
ac27a0ec DK |
1397 | /* This constant is calculated to be the largest file size for a |
1398 | * dense, 4k-blocksize file such that the total number of | |
1399 | * sectors in the file, including data and all indirect blocks, | |
1400 | * does not exceed 2^32. */ | |
1401 | const loff_t upper_limit = 0x1ff7fffd000LL; | |
1402 | ||
1403 | res += 1LL << (bits-2); | |
1404 | res += 1LL << (2*(bits-2)); | |
1405 | res += 1LL << (3*(bits-2)); | |
1406 | res <<= bits; | |
1407 | if (res > upper_limit) | |
1408 | res = upper_limit; | |
1409 | return res; | |
1410 | } | |
1411 | ||
617ba13b MC |
1412 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
1413 | ext4_fsblk_t logic_sb_block, | |
ac27a0ec DK |
1414 | int nr) |
1415 | { | |
617ba13b | 1416 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1417 | unsigned long bg, first_meta_bg; |
1418 | int has_super = 0; | |
1419 | ||
1420 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1421 | ||
617ba13b | 1422 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec DK |
1423 | nr < first_meta_bg) |
1424 | return (logic_sb_block + nr + 1); | |
1425 | bg = sbi->s_desc_per_block * nr; | |
617ba13b | 1426 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1427 | has_super = 1; |
617ba13b | 1428 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1429 | } |
1430 | ||
1431 | ||
617ba13b | 1432 | static int ext4_fill_super (struct super_block *sb, void *data, int silent) |
ac27a0ec DK |
1433 | { |
1434 | struct buffer_head * bh; | |
617ba13b MC |
1435 | struct ext4_super_block *es = NULL; |
1436 | struct ext4_sb_info *sbi; | |
1437 | ext4_fsblk_t block; | |
1438 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
1439 | ext4_fsblk_t logic_sb_block; | |
ac27a0ec DK |
1440 | unsigned long offset = 0; |
1441 | unsigned int journal_inum = 0; | |
1442 | unsigned long journal_devnum = 0; | |
1443 | unsigned long def_mount_opts; | |
1444 | struct inode *root; | |
1445 | int blocksize; | |
1446 | int hblock; | |
1447 | int db_count; | |
1448 | int i; | |
1449 | int needs_recovery; | |
1450 | __le32 features; | |
bd81d8ee | 1451 | __u64 blocks_count; |
ac27a0ec DK |
1452 | |
1453 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1454 | if (!sbi) | |
1455 | return -ENOMEM; | |
1456 | sb->s_fs_info = sbi; | |
1457 | sbi->s_mount_opt = 0; | |
617ba13b MC |
1458 | sbi->s_resuid = EXT4_DEF_RESUID; |
1459 | sbi->s_resgid = EXT4_DEF_RESGID; | |
ac27a0ec DK |
1460 | |
1461 | unlock_kernel(); | |
1462 | ||
617ba13b | 1463 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 1464 | if (!blocksize) { |
617ba13b | 1465 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
1466 | goto out_fail; |
1467 | } | |
1468 | ||
1469 | /* | |
617ba13b | 1470 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
1471 | * block sizes. We need to calculate the offset from buffer start. |
1472 | */ | |
617ba13b | 1473 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
3a5b2ecd MC |
1474 | logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1475 | offset = sector_div(logic_sb_block, blocksize); | |
ac27a0ec DK |
1476 | } else { |
1477 | logic_sb_block = sb_block; | |
1478 | } | |
1479 | ||
1480 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
617ba13b | 1481 | printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
1482 | goto out_fail; |
1483 | } | |
1484 | /* | |
1485 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 1486 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 1487 | */ |
617ba13b | 1488 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
1489 | sbi->s_es = es; |
1490 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
1491 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
1492 | goto cantfind_ext4; | |
ac27a0ec DK |
1493 | |
1494 | /* Set defaults before we parse the mount options */ | |
1495 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 1496 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 1497 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 1498 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 1499 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 1500 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 1501 | set_opt(sbi->s_mount_opt, NO_UID32); |
617ba13b | 1502 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 1503 | set_opt(sbi->s_mount_opt, XATTR_USER); |
617ba13b | 1504 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 1505 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
617ba13b MC |
1506 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
1507 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
1508 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
1509 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
1510 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
1511 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
1512 | ||
1513 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 1514 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
617ba13b | 1515 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) |
ac27a0ec DK |
1516 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
1517 | ||
1518 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1519 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1520 | ||
1521 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1522 | ||
1523 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, | |
1524 | NULL, 0)) | |
1525 | goto failed_mount; | |
1526 | ||
1527 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 1528 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 1529 | |
617ba13b MC |
1530 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
1531 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1532 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1533 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 1534 | printk(KERN_WARNING |
617ba13b | 1535 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec DK |
1536 | "running e2fsck is recommended\n"); |
1537 | /* | |
1538 | * Check feature flags regardless of the revision level, since we | |
1539 | * previously didn't change the revision level when setting the flags, | |
1540 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1541 | */ | |
617ba13b | 1542 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 1543 | if (features) { |
617ba13b | 1544 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
ac27a0ec DK |
1545 | "unsupported optional features (%x).\n", |
1546 | sb->s_id, le32_to_cpu(features)); | |
1547 | goto failed_mount; | |
1548 | } | |
617ba13b | 1549 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 1550 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 1551 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
ac27a0ec DK |
1552 | "unsupported optional features (%x).\n", |
1553 | sb->s_id, le32_to_cpu(features)); | |
1554 | goto failed_mount; | |
1555 | } | |
1556 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
1557 | ||
617ba13b MC |
1558 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
1559 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 1560 | printk(KERN_ERR |
617ba13b | 1561 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
1562 | blocksize, sb->s_id); |
1563 | goto failed_mount; | |
1564 | } | |
1565 | ||
1566 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1567 | if (sb->s_blocksize != blocksize) { | |
1568 | /* | |
1569 | * Make sure the blocksize for the filesystem is larger | |
1570 | * than the hardware sectorsize for the machine. | |
1571 | */ | |
1572 | if (blocksize < hblock) { | |
617ba13b | 1573 | printk(KERN_ERR "EXT4-fs: blocksize %d too small for " |
ac27a0ec DK |
1574 | "device blocksize %d.\n", blocksize, hblock); |
1575 | goto failed_mount; | |
1576 | } | |
1577 | ||
1578 | brelse (bh); | |
1579 | sb_set_blocksize(sb, blocksize); | |
3a5b2ecd MC |
1580 | logic_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1581 | offset = sector_div(logic_sb_block, blocksize); | |
ac27a0ec DK |
1582 | bh = sb_bread(sb, logic_sb_block); |
1583 | if (!bh) { | |
1584 | printk(KERN_ERR | |
617ba13b | 1585 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
1586 | goto failed_mount; |
1587 | } | |
617ba13b | 1588 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 1589 | sbi->s_es = es; |
617ba13b | 1590 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
ac27a0ec | 1591 | printk (KERN_ERR |
617ba13b | 1592 | "EXT4-fs: Magic mismatch, very weird !\n"); |
ac27a0ec DK |
1593 | goto failed_mount; |
1594 | } | |
1595 | } | |
1596 | ||
617ba13b | 1597 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
ac27a0ec | 1598 | |
617ba13b MC |
1599 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
1600 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
1601 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
1602 | } else { |
1603 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1604 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 1605 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
ac27a0ec DK |
1606 | (sbi->s_inode_size & (sbi->s_inode_size - 1)) || |
1607 | (sbi->s_inode_size > blocksize)) { | |
1608 | printk (KERN_ERR | |
617ba13b | 1609 | "EXT4-fs: unsupported inode size: %d\n", |
ac27a0ec DK |
1610 | sbi->s_inode_size); |
1611 | goto failed_mount; | |
1612 | } | |
1613 | } | |
617ba13b | 1614 | sbi->s_frag_size = EXT4_MIN_FRAG_SIZE << |
ac27a0ec DK |
1615 | le32_to_cpu(es->s_log_frag_size); |
1616 | if (blocksize != sbi->s_frag_size) { | |
1617 | printk(KERN_ERR | |
617ba13b | 1618 | "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n", |
ac27a0ec DK |
1619 | sbi->s_frag_size, blocksize); |
1620 | goto failed_mount; | |
1621 | } | |
1622 | sbi->s_frags_per_block = 1; | |
1623 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1624 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1625 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
617ba13b MC |
1626 | if (EXT4_INODE_SIZE(sb) == 0) |
1627 | goto cantfind_ext4; | |
1628 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 1629 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 1630 | goto cantfind_ext4; |
ac27a0ec DK |
1631 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1632 | sbi->s_inodes_per_block; | |
617ba13b | 1633 | sbi->s_desc_per_block = blocksize / sizeof(struct ext4_group_desc); |
ac27a0ec DK |
1634 | sbi->s_sbh = bh; |
1635 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
617ba13b MC |
1636 | sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb)); |
1637 | sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb)); | |
ac27a0ec DK |
1638 | for (i=0; i < 4; i++) |
1639 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1640 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1641 | ||
1642 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1643 | printk (KERN_ERR | |
617ba13b | 1644 | "EXT4-fs: #blocks per group too big: %lu\n", |
ac27a0ec DK |
1645 | sbi->s_blocks_per_group); |
1646 | goto failed_mount; | |
1647 | } | |
1648 | if (sbi->s_frags_per_group > blocksize * 8) { | |
1649 | printk (KERN_ERR | |
617ba13b | 1650 | "EXT4-fs: #fragments per group too big: %lu\n", |
ac27a0ec DK |
1651 | sbi->s_frags_per_group); |
1652 | goto failed_mount; | |
1653 | } | |
1654 | if (sbi->s_inodes_per_group > blocksize * 8) { | |
1655 | printk (KERN_ERR | |
617ba13b | 1656 | "EXT4-fs: #inodes per group too big: %lu\n", |
ac27a0ec DK |
1657 | sbi->s_inodes_per_group); |
1658 | goto failed_mount; | |
1659 | } | |
1660 | ||
bd81d8ee | 1661 | if (ext4_blocks_count(es) > |
ac27a0ec | 1662 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
617ba13b | 1663 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
1664 | " too large to mount safely\n", sb->s_id); |
1665 | if (sizeof(sector_t) < 8) | |
617ba13b | 1666 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
1667 | "enabled\n"); |
1668 | goto failed_mount; | |
1669 | } | |
1670 | ||
617ba13b MC |
1671 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
1672 | goto cantfind_ext4; | |
bd81d8ee LV |
1673 | blocks_count = (ext4_blocks_count(es) - |
1674 | le32_to_cpu(es->s_first_data_block) + | |
1675 | EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
1676 | do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); | |
1677 | sbi->s_groups_count = blocks_count; | |
617ba13b MC |
1678 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
1679 | EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec DK |
1680 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), |
1681 | GFP_KERNEL); | |
1682 | if (sbi->s_group_desc == NULL) { | |
617ba13b | 1683 | printk (KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
1684 | goto failed_mount; |
1685 | } | |
1686 | ||
1687 | bgl_lock_init(&sbi->s_blockgroup_lock); | |
1688 | ||
1689 | for (i = 0; i < db_count; i++) { | |
1690 | block = descriptor_loc(sb, logic_sb_block, i); | |
1691 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1692 | if (!sbi->s_group_desc[i]) { | |
617ba13b | 1693 | printk (KERN_ERR "EXT4-fs: " |
ac27a0ec DK |
1694 | "can't read group descriptor %d\n", i); |
1695 | db_count = i; | |
1696 | goto failed_mount2; | |
1697 | } | |
1698 | } | |
617ba13b MC |
1699 | if (!ext4_check_descriptors (sb)) { |
1700 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); | |
ac27a0ec DK |
1701 | goto failed_mount2; |
1702 | } | |
1703 | sbi->s_gdb_count = db_count; | |
1704 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1705 | spin_lock_init(&sbi->s_next_gen_lock); | |
1706 | ||
1707 | percpu_counter_init(&sbi->s_freeblocks_counter, | |
617ba13b | 1708 | ext4_count_free_blocks(sb)); |
ac27a0ec | 1709 | percpu_counter_init(&sbi->s_freeinodes_counter, |
617ba13b | 1710 | ext4_count_free_inodes(sb)); |
ac27a0ec | 1711 | percpu_counter_init(&sbi->s_dirs_counter, |
617ba13b | 1712 | ext4_count_dirs(sb)); |
ac27a0ec DK |
1713 | |
1714 | /* per fileystem reservation list head & lock */ | |
1715 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1716 | sbi->s_rsv_window_root = RB_ROOT; | |
1717 | /* Add a single, static dummy reservation to the start of the | |
1718 | * reservation window list --- it gives us a placeholder for | |
1719 | * append-at-start-of-list which makes the allocation logic | |
1720 | * _much_ simpler. */ | |
617ba13b MC |
1721 | sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; |
1722 | sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; | |
ac27a0ec DK |
1723 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
1724 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
617ba13b | 1725 | ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); |
ac27a0ec DK |
1726 | |
1727 | /* | |
1728 | * set up enough so that it can read an inode | |
1729 | */ | |
617ba13b MC |
1730 | sb->s_op = &ext4_sops; |
1731 | sb->s_export_op = &ext4_export_ops; | |
1732 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 1733 | #ifdef CONFIG_QUOTA |
617ba13b MC |
1734 | sb->s_qcop = &ext4_qctl_operations; |
1735 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
1736 | #endif |
1737 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
1738 | ||
1739 | sb->s_root = NULL; | |
1740 | ||
1741 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
1742 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
1743 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
1744 | |
1745 | /* | |
1746 | * The first inode we look at is the journal inode. Don't try | |
1747 | * root first: it may be modified in the journal! | |
1748 | */ | |
1749 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
1750 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
1751 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec DK |
1752 | goto failed_mount3; |
1753 | } else if (journal_inum) { | |
617ba13b | 1754 | if (ext4_create_journal(sb, es, journal_inum)) |
ac27a0ec DK |
1755 | goto failed_mount3; |
1756 | } else { | |
1757 | if (!silent) | |
1758 | printk (KERN_ERR | |
617ba13b | 1759 | "ext4: No journal on filesystem on %s\n", |
ac27a0ec DK |
1760 | sb->s_id); |
1761 | goto failed_mount3; | |
1762 | } | |
1763 | ||
1764 | /* We have now updated the journal if required, so we can | |
1765 | * validate the data journaling mode. */ | |
1766 | switch (test_opt(sb, DATA_FLAGS)) { | |
1767 | case 0: | |
1768 | /* No mode set, assume a default based on the journal | |
1769 | capabilities: ORDERED_DATA if the journal can | |
1770 | cope, else JOURNAL_DATA */ | |
dab291af MC |
1771 | if (jbd2_journal_check_available_features |
1772 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
ac27a0ec DK |
1773 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
1774 | else | |
1775 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
1776 | break; | |
1777 | ||
617ba13b MC |
1778 | case EXT4_MOUNT_ORDERED_DATA: |
1779 | case EXT4_MOUNT_WRITEBACK_DATA: | |
dab291af MC |
1780 | if (!jbd2_journal_check_available_features |
1781 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 1782 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
1783 | "requested data journaling mode\n"); |
1784 | goto failed_mount4; | |
1785 | } | |
1786 | default: | |
1787 | break; | |
1788 | } | |
1789 | ||
1790 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
1791 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
1792 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
1793 | "its supported only with writeback mode\n"); |
1794 | clear_opt(sbi->s_mount_opt, NOBH); | |
1795 | } | |
1796 | } | |
1797 | /* | |
dab291af | 1798 | * The jbd2_journal_load will have done any necessary log recovery, |
ac27a0ec DK |
1799 | * so we can safely mount the rest of the filesystem now. |
1800 | */ | |
1801 | ||
617ba13b | 1802 | root = iget(sb, EXT4_ROOT_INO); |
ac27a0ec DK |
1803 | sb->s_root = d_alloc_root(root); |
1804 | if (!sb->s_root) { | |
617ba13b | 1805 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
ac27a0ec DK |
1806 | iput(root); |
1807 | goto failed_mount4; | |
1808 | } | |
1809 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1810 | dput(sb->s_root); | |
1811 | sb->s_root = NULL; | |
617ba13b | 1812 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
1813 | goto failed_mount4; |
1814 | } | |
1815 | ||
617ba13b | 1816 | ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
ac27a0ec DK |
1817 | /* |
1818 | * akpm: core read_super() calls in here with the superblock locked. | |
1819 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
1820 | * in numerous places. Here we just pop the lock - it's relatively | |
1821 | * harmless, because we are now ready to accept write_super() requests, | |
1822 | * and aviro says that's the only reason for hanging onto the | |
1823 | * superblock lock. | |
1824 | */ | |
617ba13b MC |
1825 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
1826 | ext4_orphan_cleanup(sb, es); | |
1827 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
ac27a0ec | 1828 | if (needs_recovery) |
617ba13b MC |
1829 | printk (KERN_INFO "EXT4-fs: recovery complete.\n"); |
1830 | ext4_mark_recovery_complete(sb, es); | |
1831 | printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", | |
1832 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": | |
1833 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": | |
ac27a0ec DK |
1834 | "writeback"); |
1835 | ||
a86c6181 AT |
1836 | ext4_ext_init(sb); |
1837 | ||
ac27a0ec DK |
1838 | lock_kernel(); |
1839 | return 0; | |
1840 | ||
617ba13b | 1841 | cantfind_ext4: |
ac27a0ec | 1842 | if (!silent) |
617ba13b | 1843 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
1844 | sb->s_id); |
1845 | goto failed_mount; | |
1846 | ||
1847 | failed_mount4: | |
dab291af | 1848 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec DK |
1849 | failed_mount3: |
1850 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1851 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1852 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1853 | failed_mount2: | |
1854 | for (i = 0; i < db_count; i++) | |
1855 | brelse(sbi->s_group_desc[i]); | |
1856 | kfree(sbi->s_group_desc); | |
1857 | failed_mount: | |
1858 | #ifdef CONFIG_QUOTA | |
1859 | for (i = 0; i < MAXQUOTAS; i++) | |
1860 | kfree(sbi->s_qf_names[i]); | |
1861 | #endif | |
617ba13b | 1862 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
1863 | brelse(bh); |
1864 | out_fail: | |
1865 | sb->s_fs_info = NULL; | |
1866 | kfree(sbi); | |
1867 | lock_kernel(); | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * Setup any per-fs journal parameters now. We'll do this both on | |
1873 | * initial mount, once the journal has been initialised but before we've | |
1874 | * done any recovery; and again on any subsequent remount. | |
1875 | */ | |
617ba13b | 1876 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 1877 | { |
617ba13b | 1878 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1879 | |
1880 | if (sbi->s_commit_interval) | |
1881 | journal->j_commit_interval = sbi->s_commit_interval; | |
617ba13b | 1882 | /* We could also set up an ext4-specific default for the commit |
ac27a0ec DK |
1883 | * interval here, but for now we'll just fall back to the jbd |
1884 | * default. */ | |
1885 | ||
1886 | spin_lock(&journal->j_state_lock); | |
1887 | if (test_opt(sb, BARRIER)) | |
dab291af | 1888 | journal->j_flags |= JBD2_BARRIER; |
ac27a0ec | 1889 | else |
dab291af | 1890 | journal->j_flags &= ~JBD2_BARRIER; |
ac27a0ec DK |
1891 | spin_unlock(&journal->j_state_lock); |
1892 | } | |
1893 | ||
617ba13b | 1894 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
1895 | unsigned int journal_inum) |
1896 | { | |
1897 | struct inode *journal_inode; | |
1898 | journal_t *journal; | |
1899 | ||
1900 | /* First, test for the existence of a valid inode on disk. Bad | |
1901 | * things happen if we iget() an unused inode, as the subsequent | |
1902 | * iput() will try to delete it. */ | |
1903 | ||
1904 | journal_inode = iget(sb, journal_inum); | |
1905 | if (!journal_inode) { | |
617ba13b | 1906 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
1907 | return NULL; |
1908 | } | |
1909 | if (!journal_inode->i_nlink) { | |
1910 | make_bad_inode(journal_inode); | |
1911 | iput(journal_inode); | |
617ba13b | 1912 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
1913 | return NULL; |
1914 | } | |
1915 | ||
1916 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
1917 | journal_inode, journal_inode->i_size); | |
1918 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
617ba13b | 1919 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
1920 | iput(journal_inode); |
1921 | return NULL; | |
1922 | } | |
1923 | ||
dab291af | 1924 | journal = jbd2_journal_init_inode(journal_inode); |
ac27a0ec | 1925 | if (!journal) { |
617ba13b | 1926 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
1927 | iput(journal_inode); |
1928 | return NULL; | |
1929 | } | |
1930 | journal->j_private = sb; | |
617ba13b | 1931 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
1932 | return journal; |
1933 | } | |
1934 | ||
617ba13b | 1935 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
1936 | dev_t j_dev) |
1937 | { | |
1938 | struct buffer_head * bh; | |
1939 | journal_t *journal; | |
617ba13b MC |
1940 | ext4_fsblk_t start; |
1941 | ext4_fsblk_t len; | |
ac27a0ec | 1942 | int hblock, blocksize; |
617ba13b | 1943 | ext4_fsblk_t sb_block; |
ac27a0ec | 1944 | unsigned long offset; |
617ba13b | 1945 | struct ext4_super_block * es; |
ac27a0ec DK |
1946 | struct block_device *bdev; |
1947 | ||
617ba13b | 1948 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
1949 | if (bdev == NULL) |
1950 | return NULL; | |
1951 | ||
1952 | if (bd_claim(bdev, sb)) { | |
1953 | printk(KERN_ERR | |
617ba13b | 1954 | "EXT4: failed to claim external journal device.\n"); |
ac27a0ec DK |
1955 | blkdev_put(bdev); |
1956 | return NULL; | |
1957 | } | |
1958 | ||
1959 | blocksize = sb->s_blocksize; | |
1960 | hblock = bdev_hardsect_size(bdev); | |
1961 | if (blocksize < hblock) { | |
1962 | printk(KERN_ERR | |
617ba13b | 1963 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
1964 | goto out_bdev; |
1965 | } | |
1966 | ||
617ba13b MC |
1967 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
1968 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
1969 | set_blocksize(bdev, blocksize); |
1970 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 1971 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
1972 | "external journal\n"); |
1973 | goto out_bdev; | |
1974 | } | |
1975 | ||
617ba13b MC |
1976 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
1977 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 1978 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
1979 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
1980 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
1981 | "bad superblock\n"); |
1982 | brelse(bh); | |
1983 | goto out_bdev; | |
1984 | } | |
1985 | ||
617ba13b MC |
1986 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
1987 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
1988 | brelse(bh); |
1989 | goto out_bdev; | |
1990 | } | |
1991 | ||
bd81d8ee | 1992 | len = ext4_blocks_count(es); |
ac27a0ec DK |
1993 | start = sb_block + 1; |
1994 | brelse(bh); /* we're done with the superblock */ | |
1995 | ||
dab291af | 1996 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
ac27a0ec DK |
1997 | start, len, blocksize); |
1998 | if (!journal) { | |
617ba13b | 1999 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
2000 | goto out_bdev; |
2001 | } | |
2002 | journal->j_private = sb; | |
2003 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
2004 | wait_on_buffer(journal->j_sb_buffer); | |
2005 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 2006 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
2007 | goto out_journal; |
2008 | } | |
2009 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 2010 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
2011 | "user (unsupported) - %d\n", |
2012 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
2013 | goto out_journal; | |
2014 | } | |
617ba13b MC |
2015 | EXT4_SB(sb)->journal_bdev = bdev; |
2016 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
2017 | return journal; |
2018 | out_journal: | |
dab291af | 2019 | jbd2_journal_destroy(journal); |
ac27a0ec | 2020 | out_bdev: |
617ba13b | 2021 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
2022 | return NULL; |
2023 | } | |
2024 | ||
617ba13b MC |
2025 | static int ext4_load_journal(struct super_block *sb, |
2026 | struct ext4_super_block *es, | |
ac27a0ec DK |
2027 | unsigned long journal_devnum) |
2028 | { | |
2029 | journal_t *journal; | |
2030 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
2031 | dev_t journal_dev; | |
2032 | int err = 0; | |
2033 | int really_read_only; | |
2034 | ||
2035 | if (journal_devnum && | |
2036 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 2037 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
2038 | "numbers have changed\n"); |
2039 | journal_dev = new_decode_dev(journal_devnum); | |
2040 | } else | |
2041 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
2042 | ||
2043 | really_read_only = bdev_read_only(sb->s_bdev); | |
2044 | ||
2045 | /* | |
2046 | * Are we loading a blank journal or performing recovery after a | |
2047 | * crash? For recovery, we need to check in advance whether we | |
2048 | * can get read-write access to the device. | |
2049 | */ | |
2050 | ||
617ba13b | 2051 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2052 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2053 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2054 | "required on readonly filesystem.\n"); |
2055 | if (really_read_only) { | |
617ba13b | 2056 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2057 | "unavailable, cannot proceed.\n"); |
2058 | return -EROFS; | |
2059 | } | |
617ba13b | 2060 | printk (KERN_INFO "EXT4-fs: write access will " |
ac27a0ec DK |
2061 | "be enabled during recovery.\n"); |
2062 | } | |
2063 | } | |
2064 | ||
2065 | if (journal_inum && journal_dev) { | |
617ba13b | 2066 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2067 | "and inode journals!\n"); |
2068 | return -EINVAL; | |
2069 | } | |
2070 | ||
2071 | if (journal_inum) { | |
617ba13b | 2072 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2073 | return -EINVAL; |
2074 | } else { | |
617ba13b | 2075 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2076 | return -EINVAL; |
2077 | } | |
2078 | ||
2079 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
dab291af | 2080 | err = jbd2_journal_update_format(journal); |
ac27a0ec | 2081 | if (err) { |
617ba13b | 2082 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
dab291af | 2083 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2084 | return err; |
2085 | } | |
2086 | } | |
2087 | ||
617ba13b | 2088 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
dab291af | 2089 | err = jbd2_journal_wipe(journal, !really_read_only); |
ac27a0ec | 2090 | if (!err) |
dab291af | 2091 | err = jbd2_journal_load(journal); |
ac27a0ec DK |
2092 | |
2093 | if (err) { | |
617ba13b | 2094 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
dab291af | 2095 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2096 | return err; |
2097 | } | |
2098 | ||
617ba13b MC |
2099 | EXT4_SB(sb)->s_journal = journal; |
2100 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2101 | |
2102 | if (journal_devnum && | |
2103 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2104 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
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 | ||
2111 | return 0; | |
2112 | } | |
2113 | ||
617ba13b MC |
2114 | static int ext4_create_journal(struct super_block * sb, |
2115 | struct ext4_super_block * es, | |
ac27a0ec DK |
2116 | unsigned int journal_inum) |
2117 | { | |
2118 | journal_t *journal; | |
2119 | ||
2120 | if (sb->s_flags & MS_RDONLY) { | |
617ba13b | 2121 | printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
ac27a0ec DK |
2122 | "create journal.\n"); |
2123 | return -EROFS; | |
2124 | } | |
2125 | ||
617ba13b | 2126 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2127 | return -EINVAL; |
2128 | ||
617ba13b | 2129 | printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
ac27a0ec DK |
2130 | journal_inum); |
2131 | ||
dab291af | 2132 | if (jbd2_journal_create(journal)) { |
617ba13b | 2133 | printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
dab291af | 2134 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2135 | return -EIO; |
2136 | } | |
2137 | ||
617ba13b | 2138 | EXT4_SB(sb)->s_journal = journal; |
ac27a0ec | 2139 | |
617ba13b MC |
2140 | ext4_update_dynamic_rev(sb); |
2141 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
2142 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); | |
ac27a0ec DK |
2143 | |
2144 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2145 | sb->s_dirt = 1; | |
2146 | ||
2147 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2148 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2149 | |
2150 | return 0; | |
2151 | } | |
2152 | ||
617ba13b MC |
2153 | static void ext4_commit_super (struct super_block * sb, |
2154 | struct ext4_super_block * es, | |
ac27a0ec DK |
2155 | int sync) |
2156 | { | |
617ba13b | 2157 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
ac27a0ec DK |
2158 | |
2159 | if (!sbh) | |
2160 | return; | |
2161 | es->s_wtime = cpu_to_le32(get_seconds()); | |
bd81d8ee | 2162 | ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); |
617ba13b | 2163 | es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
2164 | BUFFER_TRACE(sbh, "marking dirty"); |
2165 | mark_buffer_dirty(sbh); | |
2166 | if (sync) | |
2167 | sync_dirty_buffer(sbh); | |
2168 | } | |
2169 | ||
2170 | ||
2171 | /* | |
2172 | * Have we just finished recovery? If so, and if we are mounting (or | |
2173 | * remounting) the filesystem readonly, then we will end up with a | |
2174 | * consistent fs on disk. Record that fact. | |
2175 | */ | |
617ba13b MC |
2176 | static void ext4_mark_recovery_complete(struct super_block * sb, |
2177 | struct ext4_super_block * es) | |
ac27a0ec | 2178 | { |
617ba13b | 2179 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2180 | |
dab291af MC |
2181 | jbd2_journal_lock_updates(journal); |
2182 | jbd2_journal_flush(journal); | |
617ba13b | 2183 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2184 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2185 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2186 | sb->s_dirt = 0; |
617ba13b | 2187 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2188 | } |
dab291af | 2189 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
2190 | } |
2191 | ||
2192 | /* | |
2193 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2194 | * has recorded an error from a previous lifetime, move that error to the | |
2195 | * main filesystem now. | |
2196 | */ | |
617ba13b MC |
2197 | static void ext4_clear_journal_err(struct super_block * sb, |
2198 | struct ext4_super_block * es) | |
ac27a0ec DK |
2199 | { |
2200 | journal_t *journal; | |
2201 | int j_errno; | |
2202 | const char *errstr; | |
2203 | ||
617ba13b | 2204 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2205 | |
2206 | /* | |
2207 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2208 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2209 | */ |
2210 | ||
dab291af | 2211 | j_errno = jbd2_journal_errno(journal); |
ac27a0ec DK |
2212 | if (j_errno) { |
2213 | char nbuf[16]; | |
2214 | ||
617ba13b MC |
2215 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
2216 | ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
ac27a0ec | 2217 | "from previous mount: %s", errstr); |
617ba13b | 2218 | ext4_warning(sb, __FUNCTION__, "Marking fs in need of " |
ac27a0ec DK |
2219 | "filesystem check."); |
2220 | ||
617ba13b MC |
2221 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
2222 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2223 | ext4_commit_super (sb, es, 1); | |
ac27a0ec | 2224 | |
dab291af | 2225 | jbd2_journal_clear_err(journal); |
ac27a0ec DK |
2226 | } |
2227 | } | |
2228 | ||
2229 | /* | |
2230 | * Force the running and committing transactions to commit, | |
2231 | * and wait on the commit. | |
2232 | */ | |
617ba13b | 2233 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
2234 | { |
2235 | journal_t *journal; | |
2236 | int ret; | |
2237 | ||
2238 | if (sb->s_flags & MS_RDONLY) | |
2239 | return 0; | |
2240 | ||
617ba13b | 2241 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2242 | sb->s_dirt = 0; |
617ba13b | 2243 | ret = ext4_journal_force_commit(journal); |
ac27a0ec DK |
2244 | return ret; |
2245 | } | |
2246 | ||
2247 | /* | |
617ba13b | 2248 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec DK |
2249 | * have to propagate any other updates to the superblock on disk at this |
2250 | * point. Just start an async writeback to get the buffers on their way | |
2251 | * to the disk. | |
2252 | * | |
2253 | * This implicitly triggers the writebehind on sync(). | |
2254 | */ | |
2255 | ||
617ba13b | 2256 | static void ext4_write_super (struct super_block * sb) |
ac27a0ec DK |
2257 | { |
2258 | if (mutex_trylock(&sb->s_lock) != 0) | |
2259 | BUG(); | |
2260 | sb->s_dirt = 0; | |
2261 | } | |
2262 | ||
617ba13b | 2263 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec DK |
2264 | { |
2265 | tid_t target; | |
2266 | ||
2267 | sb->s_dirt = 0; | |
dab291af | 2268 | if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
ac27a0ec | 2269 | if (wait) |
dab291af | 2270 | jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); |
ac27a0ec DK |
2271 | } |
2272 | return 0; | |
2273 | } | |
2274 | ||
2275 | /* | |
2276 | * LVM calls this function before a (read-only) snapshot is created. This | |
2277 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2278 | */ | |
617ba13b | 2279 | static void ext4_write_super_lockfs(struct super_block *sb) |
ac27a0ec DK |
2280 | { |
2281 | sb->s_dirt = 0; | |
2282 | ||
2283 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 2284 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2285 | |
2286 | /* Now we set up the journal barrier. */ | |
dab291af MC |
2287 | jbd2_journal_lock_updates(journal); |
2288 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
2289 | |
2290 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b MC |
2291 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2292 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec DK |
2293 | } |
2294 | } | |
2295 | ||
2296 | /* | |
2297 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2298 | * flag here, even though the filesystem is not technically dirty yet. | |
2299 | */ | |
617ba13b | 2300 | static void ext4_unlockfs(struct super_block *sb) |
ac27a0ec DK |
2301 | { |
2302 | if (!(sb->s_flags & MS_RDONLY)) { | |
2303 | lock_super(sb); | |
2304 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
2305 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2306 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 2307 | unlock_super(sb); |
dab291af | 2308 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
2309 | } |
2310 | } | |
2311 | ||
617ba13b | 2312 | static int ext4_remount (struct super_block * sb, int * flags, char * data) |
ac27a0ec | 2313 | { |
617ba13b MC |
2314 | struct ext4_super_block * es; |
2315 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2316 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 2317 | unsigned long old_sb_flags; |
617ba13b | 2318 | struct ext4_mount_options old_opts; |
ac27a0ec DK |
2319 | int err; |
2320 | #ifdef CONFIG_QUOTA | |
2321 | int i; | |
2322 | #endif | |
2323 | ||
2324 | /* Store the original options */ | |
2325 | old_sb_flags = sb->s_flags; | |
2326 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2327 | old_opts.s_resuid = sbi->s_resuid; | |
2328 | old_opts.s_resgid = sbi->s_resgid; | |
2329 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2330 | #ifdef CONFIG_QUOTA | |
2331 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2332 | for (i = 0; i < MAXQUOTAS; i++) | |
2333 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2334 | #endif | |
2335 | ||
2336 | /* | |
2337 | * Allow the "check" option to be passed as a remount option. | |
2338 | */ | |
2339 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { | |
2340 | err = -EINVAL; | |
2341 | goto restore_opts; | |
2342 | } | |
2343 | ||
617ba13b MC |
2344 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
2345 | ext4_abort(sb, __FUNCTION__, "Abort forced by user"); | |
ac27a0ec DK |
2346 | |
2347 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2348 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
2349 | |
2350 | es = sbi->s_es; | |
2351 | ||
617ba13b | 2352 | ext4_init_journal_params(sb, sbi->s_journal); |
ac27a0ec DK |
2353 | |
2354 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
bd81d8ee | 2355 | n_blocks_count > ext4_blocks_count(es)) { |
617ba13b | 2356 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
2357 | err = -EROFS; |
2358 | goto restore_opts; | |
2359 | } | |
2360 | ||
2361 | if (*flags & MS_RDONLY) { | |
2362 | /* | |
2363 | * First of all, the unconditional stuff we have to do | |
2364 | * to disable replay of the journal when we next remount | |
2365 | */ | |
2366 | sb->s_flags |= MS_RDONLY; | |
2367 | ||
2368 | /* | |
2369 | * OK, test if we are remounting a valid rw partition | |
2370 | * readonly, and if so set the rdonly flag and then | |
2371 | * mark the partition as valid again. | |
2372 | */ | |
617ba13b MC |
2373 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
2374 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
2375 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
2376 | ||
617ba13b | 2377 | ext4_mark_recovery_complete(sb, es); |
ac27a0ec DK |
2378 | } else { |
2379 | __le32 ret; | |
617ba13b MC |
2380 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
2381 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
2382 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec DK |
2383 | "remount RDWR because of unsupported " |
2384 | "optional features (%x).\n", | |
2385 | sb->s_id, le32_to_cpu(ret)); | |
2386 | err = -EROFS; | |
2387 | goto restore_opts; | |
2388 | } | |
2389 | /* | |
2390 | * Mounting a RDONLY partition read-write, so reread | |
2391 | * and store the current valid flag. (It may have | |
2392 | * been changed by e2fsck since we originally mounted | |
2393 | * the partition.) | |
2394 | */ | |
617ba13b | 2395 | ext4_clear_journal_err(sb, es); |
ac27a0ec | 2396 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 2397 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 2398 | goto restore_opts; |
617ba13b | 2399 | if (!ext4_setup_super (sb, es, 0)) |
ac27a0ec DK |
2400 | sb->s_flags &= ~MS_RDONLY; |
2401 | } | |
2402 | } | |
2403 | #ifdef CONFIG_QUOTA | |
2404 | /* Release old quota file names */ | |
2405 | for (i = 0; i < MAXQUOTAS; i++) | |
2406 | if (old_opts.s_qf_names[i] && | |
2407 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2408 | kfree(old_opts.s_qf_names[i]); | |
2409 | #endif | |
2410 | return 0; | |
2411 | restore_opts: | |
2412 | sb->s_flags = old_sb_flags; | |
2413 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2414 | sbi->s_resuid = old_opts.s_resuid; | |
2415 | sbi->s_resgid = old_opts.s_resgid; | |
2416 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2417 | #ifdef CONFIG_QUOTA | |
2418 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2419 | for (i = 0; i < MAXQUOTAS; i++) { | |
2420 | if (sbi->s_qf_names[i] && | |
2421 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2422 | kfree(sbi->s_qf_names[i]); | |
2423 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2424 | } | |
2425 | #endif | |
2426 | return err; | |
2427 | } | |
2428 | ||
617ba13b | 2429 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) |
ac27a0ec DK |
2430 | { |
2431 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
2432 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2433 | struct ext4_super_block *es = sbi->s_es; | |
2434 | ext4_fsblk_t overhead; | |
ac27a0ec DK |
2435 | int i; |
2436 | ||
2437 | if (test_opt (sb, MINIX_DF)) | |
2438 | overhead = 0; | |
2439 | else { | |
2440 | unsigned long ngroups; | |
617ba13b | 2441 | ngroups = EXT4_SB(sb)->s_groups_count; |
ac27a0ec DK |
2442 | smp_rmb(); |
2443 | ||
2444 | /* | |
2445 | * Compute the overhead (FS structures) | |
2446 | */ | |
2447 | ||
2448 | /* | |
2449 | * All of the blocks before first_data_block are | |
2450 | * overhead | |
2451 | */ | |
2452 | overhead = le32_to_cpu(es->s_first_data_block); | |
2453 | ||
2454 | /* | |
2455 | * Add the overhead attributed to the superblock and | |
2456 | * block group descriptors. If the sparse superblocks | |
2457 | * feature is turned on, then not all groups have this. | |
2458 | */ | |
2459 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
2460 | overhead += ext4_bg_has_super(sb, i) + |
2461 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
2462 | cond_resched(); |
2463 | } | |
2464 | ||
2465 | /* | |
2466 | * Every block group has an inode bitmap, a block | |
2467 | * bitmap, and an inode table. | |
2468 | */ | |
617ba13b | 2469 | overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group)); |
ac27a0ec DK |
2470 | } |
2471 | ||
617ba13b | 2472 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec | 2473 | buf->f_bsize = sb->s_blocksize; |
bd81d8ee | 2474 | buf->f_blocks = ext4_blocks_count(es) - overhead; |
ac27a0ec | 2475 | buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter); |
bd81d8ee LV |
2476 | buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); |
2477 | if (buf->f_bfree < ext4_r_blocks_count(es)) | |
ac27a0ec DK |
2478 | buf->f_bavail = 0; |
2479 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
2480 | buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter); | |
617ba13b | 2481 | buf->f_namelen = EXT4_NAME_LEN; |
ac27a0ec DK |
2482 | return 0; |
2483 | } | |
2484 | ||
2485 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2486 | * is locked for write. Otherwise the are possible deadlocks: | |
2487 | * Process 1 Process 2 | |
617ba13b | 2488 | * ext4_create() quota_sync() |
dab291af | 2489 | * jbd2_journal_start() write_dquot() |
ac27a0ec | 2490 | * DQUOT_INIT() down(dqio_mutex) |
dab291af | 2491 | * down(dqio_mutex) jbd2_journal_start() |
ac27a0ec DK |
2492 | * |
2493 | */ | |
2494 | ||
2495 | #ifdef CONFIG_QUOTA | |
2496 | ||
2497 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2498 | { | |
2499 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2500 | } | |
2501 | ||
617ba13b | 2502 | static int ext4_dquot_initialize(struct inode *inode, int type) |
ac27a0ec DK |
2503 | { |
2504 | handle_t *handle; | |
2505 | int ret, err; | |
2506 | ||
2507 | /* We may create quota structure so we need to reserve enough blocks */ | |
617ba13b | 2508 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2509 | if (IS_ERR(handle)) |
2510 | return PTR_ERR(handle); | |
2511 | ret = dquot_initialize(inode, type); | |
617ba13b | 2512 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2513 | if (!ret) |
2514 | ret = err; | |
2515 | return ret; | |
2516 | } | |
2517 | ||
617ba13b | 2518 | static int ext4_dquot_drop(struct inode *inode) |
ac27a0ec DK |
2519 | { |
2520 | handle_t *handle; | |
2521 | int ret, err; | |
2522 | ||
2523 | /* We may delete quota structure so we need to reserve enough blocks */ | |
617ba13b | 2524 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2525 | if (IS_ERR(handle)) |
2526 | return PTR_ERR(handle); | |
2527 | ret = dquot_drop(inode); | |
617ba13b | 2528 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2529 | if (!ret) |
2530 | ret = err; | |
2531 | return ret; | |
2532 | } | |
2533 | ||
617ba13b | 2534 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
2535 | { |
2536 | int ret, err; | |
2537 | handle_t *handle; | |
2538 | struct inode *inode; | |
2539 | ||
2540 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
2541 | handle = ext4_journal_start(inode, |
2542 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2543 | if (IS_ERR(handle)) |
2544 | return PTR_ERR(handle); | |
2545 | ret = dquot_commit(dquot); | |
617ba13b | 2546 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2547 | if (!ret) |
2548 | ret = err; | |
2549 | return ret; | |
2550 | } | |
2551 | ||
617ba13b | 2552 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
2553 | { |
2554 | int ret, err; | |
2555 | handle_t *handle; | |
2556 | ||
617ba13b MC |
2557 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2558 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2559 | if (IS_ERR(handle)) |
2560 | return PTR_ERR(handle); | |
2561 | ret = dquot_acquire(dquot); | |
617ba13b | 2562 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2563 | if (!ret) |
2564 | ret = err; | |
2565 | return ret; | |
2566 | } | |
2567 | ||
617ba13b | 2568 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
2569 | { |
2570 | int ret, err; | |
2571 | handle_t *handle; | |
2572 | ||
617ba13b MC |
2573 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2574 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2575 | if (IS_ERR(handle)) |
2576 | return PTR_ERR(handle); | |
2577 | ret = dquot_release(dquot); | |
617ba13b | 2578 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2579 | if (!ret) |
2580 | ret = err; | |
2581 | return ret; | |
2582 | } | |
2583 | ||
617ba13b | 2584 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec DK |
2585 | { |
2586 | /* Are we journalling quotas? */ | |
617ba13b MC |
2587 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
2588 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 2589 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 2590 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
2591 | } else { |
2592 | return dquot_mark_dquot_dirty(dquot); | |
2593 | } | |
2594 | } | |
2595 | ||
617ba13b | 2596 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
2597 | { |
2598 | int ret, err; | |
2599 | handle_t *handle; | |
2600 | ||
2601 | /* Data block + inode block */ | |
617ba13b | 2602 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
2603 | if (IS_ERR(handle)) |
2604 | return PTR_ERR(handle); | |
2605 | ret = dquot_commit_info(sb, type); | |
617ba13b | 2606 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2607 | if (!ret) |
2608 | ret = err; | |
2609 | return ret; | |
2610 | } | |
2611 | ||
2612 | /* | |
2613 | * Turn on quotas during mount time - we need to find | |
2614 | * the quota file and such... | |
2615 | */ | |
617ba13b | 2616 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 2617 | { |
617ba13b MC |
2618 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
2619 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
2620 | } |
2621 | ||
2622 | /* | |
2623 | * Standard function to be called on quota_on | |
2624 | */ | |
617ba13b | 2625 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
ac27a0ec DK |
2626 | char *path) |
2627 | { | |
2628 | int err; | |
2629 | struct nameidata nd; | |
2630 | ||
2631 | if (!test_opt(sb, QUOTA)) | |
2632 | return -EINVAL; | |
2633 | /* Not journalling quota? */ | |
617ba13b MC |
2634 | if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && |
2635 | !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) | |
ac27a0ec DK |
2636 | return vfs_quota_on(sb, type, format_id, path); |
2637 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
2638 | if (err) | |
2639 | return err; | |
2640 | /* Quotafile not on the same filesystem? */ | |
2641 | if (nd.mnt->mnt_sb != sb) { | |
2642 | path_release(&nd); | |
2643 | return -EXDEV; | |
2644 | } | |
2645 | /* Quotafile not of fs root? */ | |
2646 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
2647 | printk(KERN_WARNING | |
617ba13b | 2648 | "EXT4-fs: Quota file not on filesystem root. " |
ac27a0ec DK |
2649 | "Journalled quota will not work.\n"); |
2650 | path_release(&nd); | |
2651 | return vfs_quota_on(sb, type, format_id, path); | |
2652 | } | |
2653 | ||
2654 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
2655 | * acquiring the locks... As quota files are never truncated and quota code | |
2656 | * itself serializes the operations (and noone else should touch the files) | |
2657 | * we don't have to be afraid of races */ | |
617ba13b | 2658 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
2659 | size_t len, loff_t off) |
2660 | { | |
2661 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2662 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2663 | int err = 0; |
2664 | int offset = off & (sb->s_blocksize - 1); | |
2665 | int tocopy; | |
2666 | size_t toread; | |
2667 | struct buffer_head *bh; | |
2668 | loff_t i_size = i_size_read(inode); | |
2669 | ||
2670 | if (off > i_size) | |
2671 | return 0; | |
2672 | if (off+len > i_size) | |
2673 | len = i_size-off; | |
2674 | toread = len; | |
2675 | while (toread > 0) { | |
2676 | tocopy = sb->s_blocksize - offset < toread ? | |
2677 | sb->s_blocksize - offset : toread; | |
617ba13b | 2678 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
2679 | if (err) |
2680 | return err; | |
2681 | if (!bh) /* A hole? */ | |
2682 | memset(data, 0, tocopy); | |
2683 | else | |
2684 | memcpy(data, bh->b_data+offset, tocopy); | |
2685 | brelse(bh); | |
2686 | offset = 0; | |
2687 | toread -= tocopy; | |
2688 | data += tocopy; | |
2689 | blk++; | |
2690 | } | |
2691 | return len; | |
2692 | } | |
2693 | ||
2694 | /* Write to quotafile (we know the transaction is already started and has | |
2695 | * enough credits) */ | |
617ba13b | 2696 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
2697 | const char *data, size_t len, loff_t off) |
2698 | { | |
2699 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2700 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2701 | int err = 0; |
2702 | int offset = off & (sb->s_blocksize - 1); | |
2703 | int tocopy; | |
617ba13b | 2704 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
2705 | size_t towrite = len; |
2706 | struct buffer_head *bh; | |
2707 | handle_t *handle = journal_current_handle(); | |
2708 | ||
2709 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); | |
2710 | while (towrite > 0) { | |
2711 | tocopy = sb->s_blocksize - offset < towrite ? | |
2712 | sb->s_blocksize - offset : towrite; | |
617ba13b | 2713 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
2714 | if (!bh) |
2715 | goto out; | |
2716 | if (journal_quota) { | |
617ba13b | 2717 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2718 | if (err) { |
2719 | brelse(bh); | |
2720 | goto out; | |
2721 | } | |
2722 | } | |
2723 | lock_buffer(bh); | |
2724 | memcpy(bh->b_data+offset, data, tocopy); | |
2725 | flush_dcache_page(bh->b_page); | |
2726 | unlock_buffer(bh); | |
2727 | if (journal_quota) | |
617ba13b | 2728 | err = ext4_journal_dirty_metadata(handle, bh); |
ac27a0ec DK |
2729 | else { |
2730 | /* Always do at least ordered writes for quotas */ | |
617ba13b | 2731 | err = ext4_journal_dirty_data(handle, bh); |
ac27a0ec DK |
2732 | mark_buffer_dirty(bh); |
2733 | } | |
2734 | brelse(bh); | |
2735 | if (err) | |
2736 | goto out; | |
2737 | offset = 0; | |
2738 | towrite -= tocopy; | |
2739 | data += tocopy; | |
2740 | blk++; | |
2741 | } | |
2742 | out: | |
2743 | if (len == towrite) | |
2744 | return err; | |
2745 | if (inode->i_size < off+len-towrite) { | |
2746 | i_size_write(inode, off+len-towrite); | |
617ba13b | 2747 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec DK |
2748 | } |
2749 | inode->i_version++; | |
2750 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
617ba13b | 2751 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
2752 | mutex_unlock(&inode->i_mutex); |
2753 | return len - towrite; | |
2754 | } | |
2755 | ||
2756 | #endif | |
2757 | ||
617ba13b | 2758 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
2759 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
2760 | { | |
617ba13b | 2761 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
2762 | } |
2763 | ||
617ba13b | 2764 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 2765 | .owner = THIS_MODULE, |
617ba13b MC |
2766 | .name = "ext4dev", |
2767 | .get_sb = ext4_get_sb, | |
ac27a0ec DK |
2768 | .kill_sb = kill_block_super, |
2769 | .fs_flags = FS_REQUIRES_DEV, | |
2770 | }; | |
2771 | ||
617ba13b | 2772 | static int __init init_ext4_fs(void) |
ac27a0ec | 2773 | { |
617ba13b | 2774 | int err = init_ext4_xattr(); |
ac27a0ec DK |
2775 | if (err) |
2776 | return err; | |
2777 | err = init_inodecache(); | |
2778 | if (err) | |
2779 | goto out1; | |
617ba13b | 2780 | err = register_filesystem(&ext4dev_fs_type); |
ac27a0ec DK |
2781 | if (err) |
2782 | goto out; | |
2783 | return 0; | |
2784 | out: | |
2785 | destroy_inodecache(); | |
2786 | out1: | |
617ba13b | 2787 | exit_ext4_xattr(); |
ac27a0ec DK |
2788 | return err; |
2789 | } | |
2790 | ||
617ba13b | 2791 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 2792 | { |
617ba13b | 2793 | unregister_filesystem(&ext4dev_fs_type); |
ac27a0ec | 2794 | destroy_inodecache(); |
617ba13b | 2795 | exit_ext4_xattr(); |
ac27a0ec DK |
2796 | } |
2797 | ||
2798 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
617ba13b | 2799 | MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
ac27a0ec | 2800 | MODULE_LICENSE("GPL"); |
617ba13b MC |
2801 | module_init(init_ext4_fs) |
2802 | module_exit(exit_ext4_fs) |