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Merge branch 'sh/ftrace' of git://github.com/mfleming/linux-2.6
[deliverable/linux.git] / fs / ext4 / super.c
1 /*
2 * linux/fs/ext4/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.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 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/marker.h>
41 #include <linux/log2.h>
42 #include <linux/crc16.h>
43 #include <asm/uaccess.h>
44
45 #include "ext4.h"
46 #include "ext4_jbd2.h"
47 #include "xattr.h"
48 #include "acl.h"
49
50 static int default_mb_history_length = 1000;
51
52 module_param_named(default_mb_history_length, default_mb_history_length,
53 int, 0644);
54 MODULE_PARM_DESC(default_mb_history_length,
55 "Default number of entries saved for mb_history");
56
57 struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
59
60 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
61 unsigned long journal_devnum);
62 static int ext4_commit_super(struct super_block *sb, int sync);
63 static void ext4_mark_recovery_complete(struct super_block *sb,
64 struct ext4_super_block *es);
65 static void ext4_clear_journal_err(struct super_block *sb,
66 struct ext4_super_block *es);
67 static int ext4_sync_fs(struct super_block *sb, int wait);
68 static const char *ext4_decode_error(struct super_block *sb, int errno,
69 char nbuf[16]);
70 static int ext4_remount(struct super_block *sb, int *flags, char *data);
71 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
72 static int ext4_unfreeze(struct super_block *sb);
73 static void ext4_write_super(struct super_block *sb);
74 static int ext4_freeze(struct super_block *sb);
75
76
77 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
78 struct ext4_group_desc *bg)
79 {
80 return le32_to_cpu(bg->bg_block_bitmap_lo) |
81 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
82 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
83 }
84
85 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
86 struct ext4_group_desc *bg)
87 {
88 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
89 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
90 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
91 }
92
93 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
94 struct ext4_group_desc *bg)
95 {
96 return le32_to_cpu(bg->bg_inode_table_lo) |
97 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
98 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
99 }
100
101 __u32 ext4_free_blks_count(struct super_block *sb,
102 struct ext4_group_desc *bg)
103 {
104 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
105 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
106 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
107 }
108
109 __u32 ext4_free_inodes_count(struct super_block *sb,
110 struct ext4_group_desc *bg)
111 {
112 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
113 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
114 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
115 }
116
117 __u32 ext4_used_dirs_count(struct super_block *sb,
118 struct ext4_group_desc *bg)
119 {
120 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
121 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
122 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
123 }
124
125 __u32 ext4_itable_unused_count(struct super_block *sb,
126 struct ext4_group_desc *bg)
127 {
128 return le16_to_cpu(bg->bg_itable_unused_lo) |
129 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
130 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
131 }
132
133 void ext4_block_bitmap_set(struct super_block *sb,
134 struct ext4_group_desc *bg, ext4_fsblk_t blk)
135 {
136 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
137 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
138 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
139 }
140
141 void ext4_inode_bitmap_set(struct super_block *sb,
142 struct ext4_group_desc *bg, ext4_fsblk_t blk)
143 {
144 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
145 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
146 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
147 }
148
149 void ext4_inode_table_set(struct super_block *sb,
150 struct ext4_group_desc *bg, ext4_fsblk_t blk)
151 {
152 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
153 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
154 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
155 }
156
157 void ext4_free_blks_set(struct super_block *sb,
158 struct ext4_group_desc *bg, __u32 count)
159 {
160 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
161 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
162 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
163 }
164
165 void ext4_free_inodes_set(struct super_block *sb,
166 struct ext4_group_desc *bg, __u32 count)
167 {
168 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
169 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
170 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
171 }
172
173 void ext4_used_dirs_set(struct super_block *sb,
174 struct ext4_group_desc *bg, __u32 count)
175 {
176 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
177 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
178 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
179 }
180
181 void ext4_itable_unused_set(struct super_block *sb,
182 struct ext4_group_desc *bg, __u32 count)
183 {
184 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
185 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
186 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
187 }
188
189 /*
190 * Wrappers for jbd2_journal_start/end.
191 *
192 * The only special thing we need to do here is to make sure that all
193 * journal_end calls result in the superblock being marked dirty, so
194 * that sync() will call the filesystem's write_super callback if
195 * appropriate.
196 */
197 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
198 {
199 journal_t *journal;
200
201 if (sb->s_flags & MS_RDONLY)
202 return ERR_PTR(-EROFS);
203
204 /* Special case here: if the journal has aborted behind our
205 * backs (eg. EIO in the commit thread), then we still need to
206 * take the FS itself readonly cleanly. */
207 journal = EXT4_SB(sb)->s_journal;
208 if (journal) {
209 if (is_journal_aborted(journal)) {
210 ext4_abort(sb, __func__, "Detected aborted journal");
211 return ERR_PTR(-EROFS);
212 }
213 return jbd2_journal_start(journal, nblocks);
214 }
215 /*
216 * We're not journaling, return the appropriate indication.
217 */
218 current->journal_info = EXT4_NOJOURNAL_HANDLE;
219 return current->journal_info;
220 }
221
222 /*
223 * The only special thing we need to do here is to make sure that all
224 * jbd2_journal_stop calls result in the superblock being marked dirty, so
225 * that sync() will call the filesystem's write_super callback if
226 * appropriate.
227 */
228 int __ext4_journal_stop(const char *where, handle_t *handle)
229 {
230 struct super_block *sb;
231 int err;
232 int rc;
233
234 if (!ext4_handle_valid(handle)) {
235 /*
236 * Do this here since we don't call jbd2_journal_stop() in
237 * no-journal mode.
238 */
239 current->journal_info = NULL;
240 return 0;
241 }
242 sb = handle->h_transaction->t_journal->j_private;
243 err = handle->h_err;
244 rc = jbd2_journal_stop(handle);
245
246 if (!err)
247 err = rc;
248 if (err)
249 __ext4_std_error(sb, where, err);
250 return err;
251 }
252
253 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
254 struct buffer_head *bh, handle_t *handle, int err)
255 {
256 char nbuf[16];
257 const char *errstr = ext4_decode_error(NULL, err, nbuf);
258
259 BUG_ON(!ext4_handle_valid(handle));
260
261 if (bh)
262 BUFFER_TRACE(bh, "abort");
263
264 if (!handle->h_err)
265 handle->h_err = err;
266
267 if (is_handle_aborted(handle))
268 return;
269
270 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
271 caller, errstr, err_fn);
272
273 jbd2_journal_abort_handle(handle);
274 }
275
276 /* Deal with the reporting of failure conditions on a filesystem such as
277 * inconsistencies detected or read IO failures.
278 *
279 * On ext2, we can store the error state of the filesystem in the
280 * superblock. That is not possible on ext4, because we may have other
281 * write ordering constraints on the superblock which prevent us from
282 * writing it out straight away; and given that the journal is about to
283 * be aborted, we can't rely on the current, or future, transactions to
284 * write out the superblock safely.
285 *
286 * We'll just use the jbd2_journal_abort() error code to record an error in
287 * the journal instead. On recovery, the journal will compain about
288 * that error until we've noted it down and cleared it.
289 */
290
291 static void ext4_handle_error(struct super_block *sb)
292 {
293 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
294
295 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
296 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
297
298 if (sb->s_flags & MS_RDONLY)
299 return;
300
301 if (!test_opt(sb, ERRORS_CONT)) {
302 journal_t *journal = EXT4_SB(sb)->s_journal;
303
304 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
305 if (journal)
306 jbd2_journal_abort(journal, -EIO);
307 }
308 if (test_opt(sb, ERRORS_RO)) {
309 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
310 sb->s_flags |= MS_RDONLY;
311 }
312 ext4_commit_super(sb, 1);
313 if (test_opt(sb, ERRORS_PANIC))
314 panic("EXT4-fs (device %s): panic forced after error\n",
315 sb->s_id);
316 }
317
318 void ext4_error(struct super_block *sb, const char *function,
319 const char *fmt, ...)
320 {
321 va_list args;
322
323 va_start(args, fmt);
324 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
325 vprintk(fmt, args);
326 printk("\n");
327 va_end(args);
328
329 ext4_handle_error(sb);
330 }
331
332 static const char *ext4_decode_error(struct super_block *sb, int errno,
333 char nbuf[16])
334 {
335 char *errstr = NULL;
336
337 switch (errno) {
338 case -EIO:
339 errstr = "IO failure";
340 break;
341 case -ENOMEM:
342 errstr = "Out of memory";
343 break;
344 case -EROFS:
345 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
346 errstr = "Journal has aborted";
347 else
348 errstr = "Readonly filesystem";
349 break;
350 default:
351 /* If the caller passed in an extra buffer for unknown
352 * errors, textualise them now. Else we just return
353 * NULL. */
354 if (nbuf) {
355 /* Check for truncated error codes... */
356 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
357 errstr = nbuf;
358 }
359 break;
360 }
361
362 return errstr;
363 }
364
365 /* __ext4_std_error decodes expected errors from journaling functions
366 * automatically and invokes the appropriate error response. */
367
368 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
369 {
370 char nbuf[16];
371 const char *errstr;
372
373 /* Special case: if the error is EROFS, and we're not already
374 * inside a transaction, then there's really no point in logging
375 * an error. */
376 if (errno == -EROFS && journal_current_handle() == NULL &&
377 (sb->s_flags & MS_RDONLY))
378 return;
379
380 errstr = ext4_decode_error(sb, errno, nbuf);
381 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
382 sb->s_id, function, errstr);
383
384 ext4_handle_error(sb);
385 }
386
387 /*
388 * ext4_abort is a much stronger failure handler than ext4_error. The
389 * abort function may be used to deal with unrecoverable failures such
390 * as journal IO errors or ENOMEM at a critical moment in log management.
391 *
392 * We unconditionally force the filesystem into an ABORT|READONLY state,
393 * unless the error response on the fs has been set to panic in which
394 * case we take the easy way out and panic immediately.
395 */
396
397 void ext4_abort(struct super_block *sb, const char *function,
398 const char *fmt, ...)
399 {
400 va_list args;
401
402 va_start(args, fmt);
403 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
404 vprintk(fmt, args);
405 printk("\n");
406 va_end(args);
407
408 if (test_opt(sb, ERRORS_PANIC))
409 panic("EXT4-fs panic from previous error\n");
410
411 if (sb->s_flags & MS_RDONLY)
412 return;
413
414 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
415 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
416 sb->s_flags |= MS_RDONLY;
417 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
418 if (EXT4_SB(sb)->s_journal)
419 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
420 }
421
422 void ext4_msg (struct super_block * sb, const char *prefix,
423 const char *fmt, ...)
424 {
425 va_list args;
426
427 va_start(args, fmt);
428 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
429 vprintk(fmt, args);
430 printk("\n");
431 va_end(args);
432 }
433
434 void ext4_warning(struct super_block *sb, const char *function,
435 const char *fmt, ...)
436 {
437 va_list args;
438
439 va_start(args, fmt);
440 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
441 sb->s_id, function);
442 vprintk(fmt, args);
443 printk("\n");
444 va_end(args);
445 }
446
447 void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
448 const char *function, const char *fmt, ...)
449 __releases(bitlock)
450 __acquires(bitlock)
451 {
452 va_list args;
453 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
454
455 va_start(args, fmt);
456 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
457 vprintk(fmt, args);
458 printk("\n");
459 va_end(args);
460
461 if (test_opt(sb, ERRORS_CONT)) {
462 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
463 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
464 ext4_commit_super(sb, 0);
465 return;
466 }
467 ext4_unlock_group(sb, grp);
468 ext4_handle_error(sb);
469 /*
470 * We only get here in the ERRORS_RO case; relocking the group
471 * may be dangerous, but nothing bad will happen since the
472 * filesystem will have already been marked read/only and the
473 * journal has been aborted. We return 1 as a hint to callers
474 * who might what to use the return value from
475 * ext4_grp_locked_error() to distinguish beween the
476 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
477 * aggressively from the ext4 function in question, with a
478 * more appropriate error code.
479 */
480 ext4_lock_group(sb, grp);
481 return;
482 }
483
484 void ext4_update_dynamic_rev(struct super_block *sb)
485 {
486 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
487
488 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
489 return;
490
491 ext4_warning(sb, __func__,
492 "updating to rev %d because of new feature flag, "
493 "running e2fsck is recommended",
494 EXT4_DYNAMIC_REV);
495
496 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
497 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
498 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
499 /* leave es->s_feature_*compat flags alone */
500 /* es->s_uuid will be set by e2fsck if empty */
501
502 /*
503 * The rest of the superblock fields should be zero, and if not it
504 * means they are likely already in use, so leave them alone. We
505 * can leave it up to e2fsck to clean up any inconsistencies there.
506 */
507 }
508
509 /*
510 * Open the external journal device
511 */
512 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
513 {
514 struct block_device *bdev;
515 char b[BDEVNAME_SIZE];
516
517 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
518 if (IS_ERR(bdev))
519 goto fail;
520 return bdev;
521
522 fail:
523 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
524 __bdevname(dev, b), PTR_ERR(bdev));
525 return NULL;
526 }
527
528 /*
529 * Release the journal device
530 */
531 static int ext4_blkdev_put(struct block_device *bdev)
532 {
533 bd_release(bdev);
534 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
535 }
536
537 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
538 {
539 struct block_device *bdev;
540 int ret = -ENODEV;
541
542 bdev = sbi->journal_bdev;
543 if (bdev) {
544 ret = ext4_blkdev_put(bdev);
545 sbi->journal_bdev = NULL;
546 }
547 return ret;
548 }
549
550 static inline struct inode *orphan_list_entry(struct list_head *l)
551 {
552 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
553 }
554
555 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
556 {
557 struct list_head *l;
558
559 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
560 le32_to_cpu(sbi->s_es->s_last_orphan));
561
562 printk(KERN_ERR "sb_info orphan list:\n");
563 list_for_each(l, &sbi->s_orphan) {
564 struct inode *inode = orphan_list_entry(l);
565 printk(KERN_ERR " "
566 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
567 inode->i_sb->s_id, inode->i_ino, inode,
568 inode->i_mode, inode->i_nlink,
569 NEXT_ORPHAN(inode));
570 }
571 }
572
573 static void ext4_put_super(struct super_block *sb)
574 {
575 struct ext4_sb_info *sbi = EXT4_SB(sb);
576 struct ext4_super_block *es = sbi->s_es;
577 int i, err;
578
579 ext4_release_system_zone(sb);
580 ext4_mb_release(sb);
581 ext4_ext_release(sb);
582 ext4_xattr_put_super(sb);
583 if (sbi->s_journal) {
584 err = jbd2_journal_destroy(sbi->s_journal);
585 sbi->s_journal = NULL;
586 if (err < 0)
587 ext4_abort(sb, __func__,
588 "Couldn't clean up the journal");
589 }
590 if (!(sb->s_flags & MS_RDONLY)) {
591 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
592 es->s_state = cpu_to_le16(sbi->s_mount_state);
593 ext4_commit_super(sb, 1);
594 }
595 if (sbi->s_proc) {
596 remove_proc_entry(sb->s_id, ext4_proc_root);
597 }
598 kobject_del(&sbi->s_kobj);
599
600 for (i = 0; i < sbi->s_gdb_count; i++)
601 brelse(sbi->s_group_desc[i]);
602 kfree(sbi->s_group_desc);
603 if (is_vmalloc_addr(sbi->s_flex_groups))
604 vfree(sbi->s_flex_groups);
605 else
606 kfree(sbi->s_flex_groups);
607 percpu_counter_destroy(&sbi->s_freeblocks_counter);
608 percpu_counter_destroy(&sbi->s_freeinodes_counter);
609 percpu_counter_destroy(&sbi->s_dirs_counter);
610 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
611 brelse(sbi->s_sbh);
612 #ifdef CONFIG_QUOTA
613 for (i = 0; i < MAXQUOTAS; i++)
614 kfree(sbi->s_qf_names[i]);
615 #endif
616
617 /* Debugging code just in case the in-memory inode orphan list
618 * isn't empty. The on-disk one can be non-empty if we've
619 * detected an error and taken the fs readonly, but the
620 * in-memory list had better be clean by this point. */
621 if (!list_empty(&sbi->s_orphan))
622 dump_orphan_list(sb, sbi);
623 J_ASSERT(list_empty(&sbi->s_orphan));
624
625 invalidate_bdev(sb->s_bdev);
626 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
627 /*
628 * Invalidate the journal device's buffers. We don't want them
629 * floating about in memory - the physical journal device may
630 * hotswapped, and it breaks the `ro-after' testing code.
631 */
632 sync_blockdev(sbi->journal_bdev);
633 invalidate_bdev(sbi->journal_bdev);
634 ext4_blkdev_remove(sbi);
635 }
636 sb->s_fs_info = NULL;
637 /*
638 * Now that we are completely done shutting down the
639 * superblock, we need to actually destroy the kobject.
640 */
641 unlock_kernel();
642 unlock_super(sb);
643 kobject_put(&sbi->s_kobj);
644 wait_for_completion(&sbi->s_kobj_unregister);
645 lock_super(sb);
646 lock_kernel();
647 kfree(sbi->s_blockgroup_lock);
648 kfree(sbi);
649 }
650
651 static struct kmem_cache *ext4_inode_cachep;
652
653 /*
654 * Called inside transaction, so use GFP_NOFS
655 */
656 static struct inode *ext4_alloc_inode(struct super_block *sb)
657 {
658 struct ext4_inode_info *ei;
659
660 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
661 if (!ei)
662 return NULL;
663
664 #ifdef CONFIG_EXT4_FS_POSIX_ACL
665 ei->i_acl = EXT4_ACL_NOT_CACHED;
666 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
667 #endif
668 ei->vfs_inode.i_version = 1;
669 ei->vfs_inode.i_data.writeback_index = 0;
670 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
671 INIT_LIST_HEAD(&ei->i_prealloc_list);
672 spin_lock_init(&ei->i_prealloc_lock);
673 /*
674 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
675 * therefore it can be null here. Don't check it, just initialize
676 * jinode.
677 */
678 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
679 ei->i_reserved_data_blocks = 0;
680 ei->i_reserved_meta_blocks = 0;
681 ei->i_allocated_meta_blocks = 0;
682 ei->i_delalloc_reserved_flag = 0;
683 spin_lock_init(&(ei->i_block_reservation_lock));
684
685 return &ei->vfs_inode;
686 }
687
688 static void ext4_destroy_inode(struct inode *inode)
689 {
690 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
691 ext4_msg(inode->i_sb, KERN_ERR,
692 "Inode %lu (%p): orphan list check failed!",
693 inode->i_ino, EXT4_I(inode));
694 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
695 EXT4_I(inode), sizeof(struct ext4_inode_info),
696 true);
697 dump_stack();
698 }
699 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
700 }
701
702 static void init_once(void *foo)
703 {
704 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
705
706 INIT_LIST_HEAD(&ei->i_orphan);
707 #ifdef CONFIG_EXT4_FS_XATTR
708 init_rwsem(&ei->xattr_sem);
709 #endif
710 init_rwsem(&ei->i_data_sem);
711 inode_init_once(&ei->vfs_inode);
712 }
713
714 static int init_inodecache(void)
715 {
716 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
717 sizeof(struct ext4_inode_info),
718 0, (SLAB_RECLAIM_ACCOUNT|
719 SLAB_MEM_SPREAD),
720 init_once);
721 if (ext4_inode_cachep == NULL)
722 return -ENOMEM;
723 return 0;
724 }
725
726 static void destroy_inodecache(void)
727 {
728 kmem_cache_destroy(ext4_inode_cachep);
729 }
730
731 static void ext4_clear_inode(struct inode *inode)
732 {
733 #ifdef CONFIG_EXT4_FS_POSIX_ACL
734 if (EXT4_I(inode)->i_acl &&
735 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
736 posix_acl_release(EXT4_I(inode)->i_acl);
737 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
738 }
739 if (EXT4_I(inode)->i_default_acl &&
740 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
741 posix_acl_release(EXT4_I(inode)->i_default_acl);
742 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
743 }
744 #endif
745 ext4_discard_preallocations(inode);
746 if (EXT4_JOURNAL(inode))
747 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
748 &EXT4_I(inode)->jinode);
749 }
750
751 static inline void ext4_show_quota_options(struct seq_file *seq,
752 struct super_block *sb)
753 {
754 #if defined(CONFIG_QUOTA)
755 struct ext4_sb_info *sbi = EXT4_SB(sb);
756
757 if (sbi->s_jquota_fmt)
758 seq_printf(seq, ",jqfmt=%s",
759 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
760
761 if (sbi->s_qf_names[USRQUOTA])
762 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
763
764 if (sbi->s_qf_names[GRPQUOTA])
765 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
766
767 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
768 seq_puts(seq, ",usrquota");
769
770 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
771 seq_puts(seq, ",grpquota");
772 #endif
773 }
774
775 /*
776 * Show an option if
777 * - it's set to a non-default value OR
778 * - if the per-sb default is different from the global default
779 */
780 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
781 {
782 int def_errors;
783 unsigned long def_mount_opts;
784 struct super_block *sb = vfs->mnt_sb;
785 struct ext4_sb_info *sbi = EXT4_SB(sb);
786 struct ext4_super_block *es = sbi->s_es;
787
788 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
789 def_errors = le16_to_cpu(es->s_errors);
790
791 if (sbi->s_sb_block != 1)
792 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
793 if (test_opt(sb, MINIX_DF))
794 seq_puts(seq, ",minixdf");
795 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
796 seq_puts(seq, ",grpid");
797 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
798 seq_puts(seq, ",nogrpid");
799 if (sbi->s_resuid != EXT4_DEF_RESUID ||
800 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
801 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
802 }
803 if (sbi->s_resgid != EXT4_DEF_RESGID ||
804 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
805 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
806 }
807 if (test_opt(sb, ERRORS_RO)) {
808 if (def_errors == EXT4_ERRORS_PANIC ||
809 def_errors == EXT4_ERRORS_CONTINUE) {
810 seq_puts(seq, ",errors=remount-ro");
811 }
812 }
813 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
814 seq_puts(seq, ",errors=continue");
815 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
816 seq_puts(seq, ",errors=panic");
817 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
818 seq_puts(seq, ",nouid32");
819 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
820 seq_puts(seq, ",debug");
821 if (test_opt(sb, OLDALLOC))
822 seq_puts(seq, ",oldalloc");
823 #ifdef CONFIG_EXT4_FS_XATTR
824 if (test_opt(sb, XATTR_USER) &&
825 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
826 seq_puts(seq, ",user_xattr");
827 if (!test_opt(sb, XATTR_USER) &&
828 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
829 seq_puts(seq, ",nouser_xattr");
830 }
831 #endif
832 #ifdef CONFIG_EXT4_FS_POSIX_ACL
833 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
834 seq_puts(seq, ",acl");
835 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
836 seq_puts(seq, ",noacl");
837 #endif
838 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
839 seq_printf(seq, ",commit=%u",
840 (unsigned) (sbi->s_commit_interval / HZ));
841 }
842 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
843 seq_printf(seq, ",min_batch_time=%u",
844 (unsigned) sbi->s_min_batch_time);
845 }
846 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
847 seq_printf(seq, ",max_batch_time=%u",
848 (unsigned) sbi->s_min_batch_time);
849 }
850
851 /*
852 * We're changing the default of barrier mount option, so
853 * let's always display its mount state so it's clear what its
854 * status is.
855 */
856 seq_puts(seq, ",barrier=");
857 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
858 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
859 seq_puts(seq, ",journal_async_commit");
860 if (test_opt(sb, NOBH))
861 seq_puts(seq, ",nobh");
862 if (test_opt(sb, I_VERSION))
863 seq_puts(seq, ",i_version");
864 if (!test_opt(sb, DELALLOC))
865 seq_puts(seq, ",nodelalloc");
866
867
868 if (sbi->s_stripe)
869 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
870 /*
871 * journal mode get enabled in different ways
872 * So just print the value even if we didn't specify it
873 */
874 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
875 seq_puts(seq, ",data=journal");
876 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
877 seq_puts(seq, ",data=ordered");
878 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
879 seq_puts(seq, ",data=writeback");
880
881 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
882 seq_printf(seq, ",inode_readahead_blks=%u",
883 sbi->s_inode_readahead_blks);
884
885 if (test_opt(sb, DATA_ERR_ABORT))
886 seq_puts(seq, ",data_err=abort");
887
888 if (test_opt(sb, NO_AUTO_DA_ALLOC))
889 seq_puts(seq, ",noauto_da_alloc");
890
891 ext4_show_quota_options(seq, sb);
892
893 return 0;
894 }
895
896 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
897 u64 ino, u32 generation)
898 {
899 struct inode *inode;
900
901 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
902 return ERR_PTR(-ESTALE);
903 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
904 return ERR_PTR(-ESTALE);
905
906 /* iget isn't really right if the inode is currently unallocated!!
907 *
908 * ext4_read_inode will return a bad_inode if the inode had been
909 * deleted, so we should be safe.
910 *
911 * Currently we don't know the generation for parent directory, so
912 * a generation of 0 means "accept any"
913 */
914 inode = ext4_iget(sb, ino);
915 if (IS_ERR(inode))
916 return ERR_CAST(inode);
917 if (generation && inode->i_generation != generation) {
918 iput(inode);
919 return ERR_PTR(-ESTALE);
920 }
921
922 return inode;
923 }
924
925 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
926 int fh_len, int fh_type)
927 {
928 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
929 ext4_nfs_get_inode);
930 }
931
932 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
933 int fh_len, int fh_type)
934 {
935 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
936 ext4_nfs_get_inode);
937 }
938
939 /*
940 * Try to release metadata pages (indirect blocks, directories) which are
941 * mapped via the block device. Since these pages could have journal heads
942 * which would prevent try_to_free_buffers() from freeing them, we must use
943 * jbd2 layer's try_to_free_buffers() function to release them.
944 */
945 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
946 gfp_t wait)
947 {
948 journal_t *journal = EXT4_SB(sb)->s_journal;
949
950 WARN_ON(PageChecked(page));
951 if (!page_has_buffers(page))
952 return 0;
953 if (journal)
954 return jbd2_journal_try_to_free_buffers(journal, page,
955 wait & ~__GFP_WAIT);
956 return try_to_free_buffers(page);
957 }
958
959 #ifdef CONFIG_QUOTA
960 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
961 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
962
963 static int ext4_write_dquot(struct dquot *dquot);
964 static int ext4_acquire_dquot(struct dquot *dquot);
965 static int ext4_release_dquot(struct dquot *dquot);
966 static int ext4_mark_dquot_dirty(struct dquot *dquot);
967 static int ext4_write_info(struct super_block *sb, int type);
968 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
969 char *path, int remount);
970 static int ext4_quota_on_mount(struct super_block *sb, int type);
971 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
972 size_t len, loff_t off);
973 static ssize_t ext4_quota_write(struct super_block *sb, int type,
974 const char *data, size_t len, loff_t off);
975
976 static struct dquot_operations ext4_quota_operations = {
977 .initialize = dquot_initialize,
978 .drop = dquot_drop,
979 .alloc_space = dquot_alloc_space,
980 .reserve_space = dquot_reserve_space,
981 .claim_space = dquot_claim_space,
982 .release_rsv = dquot_release_reserved_space,
983 .get_reserved_space = ext4_get_reserved_space,
984 .alloc_inode = dquot_alloc_inode,
985 .free_space = dquot_free_space,
986 .free_inode = dquot_free_inode,
987 .transfer = dquot_transfer,
988 .write_dquot = ext4_write_dquot,
989 .acquire_dquot = ext4_acquire_dquot,
990 .release_dquot = ext4_release_dquot,
991 .mark_dirty = ext4_mark_dquot_dirty,
992 .write_info = ext4_write_info,
993 .alloc_dquot = dquot_alloc,
994 .destroy_dquot = dquot_destroy,
995 };
996
997 static struct quotactl_ops ext4_qctl_operations = {
998 .quota_on = ext4_quota_on,
999 .quota_off = vfs_quota_off,
1000 .quota_sync = vfs_quota_sync,
1001 .get_info = vfs_get_dqinfo,
1002 .set_info = vfs_set_dqinfo,
1003 .get_dqblk = vfs_get_dqblk,
1004 .set_dqblk = vfs_set_dqblk
1005 };
1006 #endif
1007
1008 static const struct super_operations ext4_sops = {
1009 .alloc_inode = ext4_alloc_inode,
1010 .destroy_inode = ext4_destroy_inode,
1011 .write_inode = ext4_write_inode,
1012 .dirty_inode = ext4_dirty_inode,
1013 .delete_inode = ext4_delete_inode,
1014 .put_super = ext4_put_super,
1015 .sync_fs = ext4_sync_fs,
1016 .freeze_fs = ext4_freeze,
1017 .unfreeze_fs = ext4_unfreeze,
1018 .statfs = ext4_statfs,
1019 .remount_fs = ext4_remount,
1020 .clear_inode = ext4_clear_inode,
1021 .show_options = ext4_show_options,
1022 #ifdef CONFIG_QUOTA
1023 .quota_read = ext4_quota_read,
1024 .quota_write = ext4_quota_write,
1025 #endif
1026 .bdev_try_to_free_page = bdev_try_to_free_page,
1027 };
1028
1029 static const struct super_operations ext4_nojournal_sops = {
1030 .alloc_inode = ext4_alloc_inode,
1031 .destroy_inode = ext4_destroy_inode,
1032 .write_inode = ext4_write_inode,
1033 .dirty_inode = ext4_dirty_inode,
1034 .delete_inode = ext4_delete_inode,
1035 .write_super = ext4_write_super,
1036 .put_super = ext4_put_super,
1037 .statfs = ext4_statfs,
1038 .remount_fs = ext4_remount,
1039 .clear_inode = ext4_clear_inode,
1040 .show_options = ext4_show_options,
1041 #ifdef CONFIG_QUOTA
1042 .quota_read = ext4_quota_read,
1043 .quota_write = ext4_quota_write,
1044 #endif
1045 .bdev_try_to_free_page = bdev_try_to_free_page,
1046 };
1047
1048 static const struct export_operations ext4_export_ops = {
1049 .fh_to_dentry = ext4_fh_to_dentry,
1050 .fh_to_parent = ext4_fh_to_parent,
1051 .get_parent = ext4_get_parent,
1052 };
1053
1054 enum {
1055 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1056 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1057 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1058 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1059 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1060 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1061 Opt_journal_update, Opt_journal_dev,
1062 Opt_journal_checksum, Opt_journal_async_commit,
1063 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1064 Opt_data_err_abort, Opt_data_err_ignore, Opt_mb_history_length,
1065 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1066 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
1067 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
1068 Opt_usrquota, Opt_grpquota, Opt_i_version,
1069 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1070 Opt_block_validity, Opt_noblock_validity,
1071 Opt_inode_readahead_blks, Opt_journal_ioprio
1072 };
1073
1074 static const match_table_t tokens = {
1075 {Opt_bsd_df, "bsddf"},
1076 {Opt_minix_df, "minixdf"},
1077 {Opt_grpid, "grpid"},
1078 {Opt_grpid, "bsdgroups"},
1079 {Opt_nogrpid, "nogrpid"},
1080 {Opt_nogrpid, "sysvgroups"},
1081 {Opt_resgid, "resgid=%u"},
1082 {Opt_resuid, "resuid=%u"},
1083 {Opt_sb, "sb=%u"},
1084 {Opt_err_cont, "errors=continue"},
1085 {Opt_err_panic, "errors=panic"},
1086 {Opt_err_ro, "errors=remount-ro"},
1087 {Opt_nouid32, "nouid32"},
1088 {Opt_debug, "debug"},
1089 {Opt_oldalloc, "oldalloc"},
1090 {Opt_orlov, "orlov"},
1091 {Opt_user_xattr, "user_xattr"},
1092 {Opt_nouser_xattr, "nouser_xattr"},
1093 {Opt_acl, "acl"},
1094 {Opt_noacl, "noacl"},
1095 {Opt_noload, "noload"},
1096 {Opt_nobh, "nobh"},
1097 {Opt_bh, "bh"},
1098 {Opt_commit, "commit=%u"},
1099 {Opt_min_batch_time, "min_batch_time=%u"},
1100 {Opt_max_batch_time, "max_batch_time=%u"},
1101 {Opt_journal_update, "journal=update"},
1102 {Opt_journal_dev, "journal_dev=%u"},
1103 {Opt_journal_checksum, "journal_checksum"},
1104 {Opt_journal_async_commit, "journal_async_commit"},
1105 {Opt_abort, "abort"},
1106 {Opt_data_journal, "data=journal"},
1107 {Opt_data_ordered, "data=ordered"},
1108 {Opt_data_writeback, "data=writeback"},
1109 {Opt_data_err_abort, "data_err=abort"},
1110 {Opt_data_err_ignore, "data_err=ignore"},
1111 {Opt_mb_history_length, "mb_history_length=%u"},
1112 {Opt_offusrjquota, "usrjquota="},
1113 {Opt_usrjquota, "usrjquota=%s"},
1114 {Opt_offgrpjquota, "grpjquota="},
1115 {Opt_grpjquota, "grpjquota=%s"},
1116 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1117 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1118 {Opt_grpquota, "grpquota"},
1119 {Opt_noquota, "noquota"},
1120 {Opt_quota, "quota"},
1121 {Opt_usrquota, "usrquota"},
1122 {Opt_barrier, "barrier=%u"},
1123 {Opt_barrier, "barrier"},
1124 {Opt_nobarrier, "nobarrier"},
1125 {Opt_i_version, "i_version"},
1126 {Opt_stripe, "stripe=%u"},
1127 {Opt_resize, "resize"},
1128 {Opt_delalloc, "delalloc"},
1129 {Opt_nodelalloc, "nodelalloc"},
1130 {Opt_block_validity, "block_validity"},
1131 {Opt_noblock_validity, "noblock_validity"},
1132 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1133 {Opt_journal_ioprio, "journal_ioprio=%u"},
1134 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1135 {Opt_auto_da_alloc, "auto_da_alloc"},
1136 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1137 {Opt_err, NULL},
1138 };
1139
1140 static ext4_fsblk_t get_sb_block(void **data)
1141 {
1142 ext4_fsblk_t sb_block;
1143 char *options = (char *) *data;
1144
1145 if (!options || strncmp(options, "sb=", 3) != 0)
1146 return 1; /* Default location */
1147
1148 options += 3;
1149 /* TODO: use simple_strtoll with >32bit ext4 */
1150 sb_block = simple_strtoul(options, &options, 0);
1151 if (*options && *options != ',') {
1152 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1153 (char *) *data);
1154 return 1;
1155 }
1156 if (*options == ',')
1157 options++;
1158 *data = (void *) options;
1159
1160 return sb_block;
1161 }
1162
1163 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1164
1165 static int parse_options(char *options, struct super_block *sb,
1166 unsigned long *journal_devnum,
1167 unsigned int *journal_ioprio,
1168 ext4_fsblk_t *n_blocks_count, int is_remount)
1169 {
1170 struct ext4_sb_info *sbi = EXT4_SB(sb);
1171 char *p;
1172 substring_t args[MAX_OPT_ARGS];
1173 int data_opt = 0;
1174 int option;
1175 #ifdef CONFIG_QUOTA
1176 int qtype, qfmt;
1177 char *qname;
1178 #endif
1179
1180 if (!options)
1181 return 1;
1182
1183 while ((p = strsep(&options, ",")) != NULL) {
1184 int token;
1185 if (!*p)
1186 continue;
1187
1188 token = match_token(p, tokens, args);
1189 switch (token) {
1190 case Opt_bsd_df:
1191 clear_opt(sbi->s_mount_opt, MINIX_DF);
1192 break;
1193 case Opt_minix_df:
1194 set_opt(sbi->s_mount_opt, MINIX_DF);
1195 break;
1196 case Opt_grpid:
1197 set_opt(sbi->s_mount_opt, GRPID);
1198 break;
1199 case Opt_nogrpid:
1200 clear_opt(sbi->s_mount_opt, GRPID);
1201 break;
1202 case Opt_resuid:
1203 if (match_int(&args[0], &option))
1204 return 0;
1205 sbi->s_resuid = option;
1206 break;
1207 case Opt_resgid:
1208 if (match_int(&args[0], &option))
1209 return 0;
1210 sbi->s_resgid = option;
1211 break;
1212 case Opt_sb:
1213 /* handled by get_sb_block() instead of here */
1214 /* *sb_block = match_int(&args[0]); */
1215 break;
1216 case Opt_err_panic:
1217 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1218 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1219 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1220 break;
1221 case Opt_err_ro:
1222 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1223 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1224 set_opt(sbi->s_mount_opt, ERRORS_RO);
1225 break;
1226 case Opt_err_cont:
1227 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1228 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1229 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1230 break;
1231 case Opt_nouid32:
1232 set_opt(sbi->s_mount_opt, NO_UID32);
1233 break;
1234 case Opt_debug:
1235 set_opt(sbi->s_mount_opt, DEBUG);
1236 break;
1237 case Opt_oldalloc:
1238 set_opt(sbi->s_mount_opt, OLDALLOC);
1239 break;
1240 case Opt_orlov:
1241 clear_opt(sbi->s_mount_opt, OLDALLOC);
1242 break;
1243 #ifdef CONFIG_EXT4_FS_XATTR
1244 case Opt_user_xattr:
1245 set_opt(sbi->s_mount_opt, XATTR_USER);
1246 break;
1247 case Opt_nouser_xattr:
1248 clear_opt(sbi->s_mount_opt, XATTR_USER);
1249 break;
1250 #else
1251 case Opt_user_xattr:
1252 case Opt_nouser_xattr:
1253 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1254 break;
1255 #endif
1256 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1257 case Opt_acl:
1258 set_opt(sbi->s_mount_opt, POSIX_ACL);
1259 break;
1260 case Opt_noacl:
1261 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1262 break;
1263 #else
1264 case Opt_acl:
1265 case Opt_noacl:
1266 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1267 break;
1268 #endif
1269 case Opt_journal_update:
1270 /* @@@ FIXME */
1271 /* Eventually we will want to be able to create
1272 a journal file here. For now, only allow the
1273 user to specify an existing inode to be the
1274 journal file. */
1275 if (is_remount) {
1276 ext4_msg(sb, KERN_ERR,
1277 "Cannot specify journal on remount");
1278 return 0;
1279 }
1280 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1281 break;
1282 case Opt_journal_dev:
1283 if (is_remount) {
1284 ext4_msg(sb, KERN_ERR,
1285 "Cannot specify journal on remount");
1286 return 0;
1287 }
1288 if (match_int(&args[0], &option))
1289 return 0;
1290 *journal_devnum = option;
1291 break;
1292 case Opt_journal_checksum:
1293 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1294 break;
1295 case Opt_journal_async_commit:
1296 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1297 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1298 break;
1299 case Opt_noload:
1300 set_opt(sbi->s_mount_opt, NOLOAD);
1301 break;
1302 case Opt_commit:
1303 if (match_int(&args[0], &option))
1304 return 0;
1305 if (option < 0)
1306 return 0;
1307 if (option == 0)
1308 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1309 sbi->s_commit_interval = HZ * option;
1310 break;
1311 case Opt_max_batch_time:
1312 if (match_int(&args[0], &option))
1313 return 0;
1314 if (option < 0)
1315 return 0;
1316 if (option == 0)
1317 option = EXT4_DEF_MAX_BATCH_TIME;
1318 sbi->s_max_batch_time = option;
1319 break;
1320 case Opt_min_batch_time:
1321 if (match_int(&args[0], &option))
1322 return 0;
1323 if (option < 0)
1324 return 0;
1325 sbi->s_min_batch_time = option;
1326 break;
1327 case Opt_data_journal:
1328 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1329 goto datacheck;
1330 case Opt_data_ordered:
1331 data_opt = EXT4_MOUNT_ORDERED_DATA;
1332 goto datacheck;
1333 case Opt_data_writeback:
1334 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1335 datacheck:
1336 if (is_remount) {
1337 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1338 != data_opt) {
1339 ext4_msg(sb, KERN_ERR,
1340 "Cannot change data mode on remount");
1341 return 0;
1342 }
1343 } else {
1344 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1345 sbi->s_mount_opt |= data_opt;
1346 }
1347 break;
1348 case Opt_data_err_abort:
1349 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1350 break;
1351 case Opt_data_err_ignore:
1352 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1353 break;
1354 case Opt_mb_history_length:
1355 if (match_int(&args[0], &option))
1356 return 0;
1357 if (option < 0)
1358 return 0;
1359 sbi->s_mb_history_max = option;
1360 break;
1361 #ifdef CONFIG_QUOTA
1362 case Opt_usrjquota:
1363 qtype = USRQUOTA;
1364 goto set_qf_name;
1365 case Opt_grpjquota:
1366 qtype = GRPQUOTA;
1367 set_qf_name:
1368 if (sb_any_quota_loaded(sb) &&
1369 !sbi->s_qf_names[qtype]) {
1370 ext4_msg(sb, KERN_ERR,
1371 "Cannot change journaled "
1372 "quota options when quota turned on");
1373 return 0;
1374 }
1375 qname = match_strdup(&args[0]);
1376 if (!qname) {
1377 ext4_msg(sb, KERN_ERR,
1378 "Not enough memory for "
1379 "storing quotafile name");
1380 return 0;
1381 }
1382 if (sbi->s_qf_names[qtype] &&
1383 strcmp(sbi->s_qf_names[qtype], qname)) {
1384 ext4_msg(sb, KERN_ERR,
1385 "%s quota file already "
1386 "specified", QTYPE2NAME(qtype));
1387 kfree(qname);
1388 return 0;
1389 }
1390 sbi->s_qf_names[qtype] = qname;
1391 if (strchr(sbi->s_qf_names[qtype], '/')) {
1392 ext4_msg(sb, KERN_ERR,
1393 "quotafile must be on "
1394 "filesystem root");
1395 kfree(sbi->s_qf_names[qtype]);
1396 sbi->s_qf_names[qtype] = NULL;
1397 return 0;
1398 }
1399 set_opt(sbi->s_mount_opt, QUOTA);
1400 break;
1401 case Opt_offusrjquota:
1402 qtype = USRQUOTA;
1403 goto clear_qf_name;
1404 case Opt_offgrpjquota:
1405 qtype = GRPQUOTA;
1406 clear_qf_name:
1407 if (sb_any_quota_loaded(sb) &&
1408 sbi->s_qf_names[qtype]) {
1409 ext4_msg(sb, KERN_ERR, "Cannot change "
1410 "journaled quota options when "
1411 "quota turned on");
1412 return 0;
1413 }
1414 /*
1415 * The space will be released later when all options
1416 * are confirmed to be correct
1417 */
1418 sbi->s_qf_names[qtype] = NULL;
1419 break;
1420 case Opt_jqfmt_vfsold:
1421 qfmt = QFMT_VFS_OLD;
1422 goto set_qf_format;
1423 case Opt_jqfmt_vfsv0:
1424 qfmt = QFMT_VFS_V0;
1425 set_qf_format:
1426 if (sb_any_quota_loaded(sb) &&
1427 sbi->s_jquota_fmt != qfmt) {
1428 ext4_msg(sb, KERN_ERR, "Cannot change "
1429 "journaled quota options when "
1430 "quota turned on");
1431 return 0;
1432 }
1433 sbi->s_jquota_fmt = qfmt;
1434 break;
1435 case Opt_quota:
1436 case Opt_usrquota:
1437 set_opt(sbi->s_mount_opt, QUOTA);
1438 set_opt(sbi->s_mount_opt, USRQUOTA);
1439 break;
1440 case Opt_grpquota:
1441 set_opt(sbi->s_mount_opt, QUOTA);
1442 set_opt(sbi->s_mount_opt, GRPQUOTA);
1443 break;
1444 case Opt_noquota:
1445 if (sb_any_quota_loaded(sb)) {
1446 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1447 "options when quota turned on");
1448 return 0;
1449 }
1450 clear_opt(sbi->s_mount_opt, QUOTA);
1451 clear_opt(sbi->s_mount_opt, USRQUOTA);
1452 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1453 break;
1454 #else
1455 case Opt_quota:
1456 case Opt_usrquota:
1457 case Opt_grpquota:
1458 ext4_msg(sb, KERN_ERR,
1459 "quota options not supported");
1460 break;
1461 case Opt_usrjquota:
1462 case Opt_grpjquota:
1463 case Opt_offusrjquota:
1464 case Opt_offgrpjquota:
1465 case Opt_jqfmt_vfsold:
1466 case Opt_jqfmt_vfsv0:
1467 ext4_msg(sb, KERN_ERR,
1468 "journaled quota options not supported");
1469 break;
1470 case Opt_noquota:
1471 break;
1472 #endif
1473 case Opt_abort:
1474 set_opt(sbi->s_mount_opt, ABORT);
1475 break;
1476 case Opt_nobarrier:
1477 clear_opt(sbi->s_mount_opt, BARRIER);
1478 break;
1479 case Opt_barrier:
1480 if (match_int(&args[0], &option)) {
1481 set_opt(sbi->s_mount_opt, BARRIER);
1482 break;
1483 }
1484 if (option)
1485 set_opt(sbi->s_mount_opt, BARRIER);
1486 else
1487 clear_opt(sbi->s_mount_opt, BARRIER);
1488 break;
1489 case Opt_ignore:
1490 break;
1491 case Opt_resize:
1492 if (!is_remount) {
1493 ext4_msg(sb, KERN_ERR,
1494 "resize option only available "
1495 "for remount");
1496 return 0;
1497 }
1498 if (match_int(&args[0], &option) != 0)
1499 return 0;
1500 *n_blocks_count = option;
1501 break;
1502 case Opt_nobh:
1503 set_opt(sbi->s_mount_opt, NOBH);
1504 break;
1505 case Opt_bh:
1506 clear_opt(sbi->s_mount_opt, NOBH);
1507 break;
1508 case Opt_i_version:
1509 set_opt(sbi->s_mount_opt, I_VERSION);
1510 sb->s_flags |= MS_I_VERSION;
1511 break;
1512 case Opt_nodelalloc:
1513 clear_opt(sbi->s_mount_opt, DELALLOC);
1514 break;
1515 case Opt_stripe:
1516 if (match_int(&args[0], &option))
1517 return 0;
1518 if (option < 0)
1519 return 0;
1520 sbi->s_stripe = option;
1521 break;
1522 case Opt_delalloc:
1523 set_opt(sbi->s_mount_opt, DELALLOC);
1524 break;
1525 case Opt_block_validity:
1526 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1527 break;
1528 case Opt_noblock_validity:
1529 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1530 break;
1531 case Opt_inode_readahead_blks:
1532 if (match_int(&args[0], &option))
1533 return 0;
1534 if (option < 0 || option > (1 << 30))
1535 return 0;
1536 if (!is_power_of_2(option)) {
1537 ext4_msg(sb, KERN_ERR,
1538 "EXT4-fs: inode_readahead_blks"
1539 " must be a power of 2");
1540 return 0;
1541 }
1542 sbi->s_inode_readahead_blks = option;
1543 break;
1544 case Opt_journal_ioprio:
1545 if (match_int(&args[0], &option))
1546 return 0;
1547 if (option < 0 || option > 7)
1548 break;
1549 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1550 option);
1551 break;
1552 case Opt_noauto_da_alloc:
1553 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1554 break;
1555 case Opt_auto_da_alloc:
1556 if (match_int(&args[0], &option)) {
1557 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1558 break;
1559 }
1560 if (option)
1561 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1562 else
1563 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1564 break;
1565 default:
1566 ext4_msg(sb, KERN_ERR,
1567 "Unrecognized mount option \"%s\" "
1568 "or missing value", p);
1569 return 0;
1570 }
1571 }
1572 #ifdef CONFIG_QUOTA
1573 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1574 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1575 sbi->s_qf_names[USRQUOTA])
1576 clear_opt(sbi->s_mount_opt, USRQUOTA);
1577
1578 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1579 sbi->s_qf_names[GRPQUOTA])
1580 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1581
1582 if ((sbi->s_qf_names[USRQUOTA] &&
1583 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1584 (sbi->s_qf_names[GRPQUOTA] &&
1585 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1586 ext4_msg(sb, KERN_ERR, "old and new quota "
1587 "format mixing");
1588 return 0;
1589 }
1590
1591 if (!sbi->s_jquota_fmt) {
1592 ext4_msg(sb, KERN_ERR, "journaled quota format "
1593 "not specified");
1594 return 0;
1595 }
1596 } else {
1597 if (sbi->s_jquota_fmt) {
1598 ext4_msg(sb, KERN_ERR, "journaled quota format "
1599 "specified with no journaling "
1600 "enabled");
1601 return 0;
1602 }
1603 }
1604 #endif
1605 return 1;
1606 }
1607
1608 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1609 int read_only)
1610 {
1611 struct ext4_sb_info *sbi = EXT4_SB(sb);
1612 int res = 0;
1613
1614 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1615 ext4_msg(sb, KERN_ERR, "revision level too high, "
1616 "forcing read-only mode");
1617 res = MS_RDONLY;
1618 }
1619 if (read_only)
1620 return res;
1621 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1622 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1623 "running e2fsck is recommended");
1624 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1625 ext4_msg(sb, KERN_WARNING,
1626 "warning: mounting fs with errors, "
1627 "running e2fsck is recommended");
1628 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1629 le16_to_cpu(es->s_mnt_count) >=
1630 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1631 ext4_msg(sb, KERN_WARNING,
1632 "warning: maximal mount count reached, "
1633 "running e2fsck is recommended");
1634 else if (le32_to_cpu(es->s_checkinterval) &&
1635 (le32_to_cpu(es->s_lastcheck) +
1636 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1637 ext4_msg(sb, KERN_WARNING,
1638 "warning: checktime reached, "
1639 "running e2fsck is recommended");
1640 if (!sbi->s_journal)
1641 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1642 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1643 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1644 le16_add_cpu(&es->s_mnt_count, 1);
1645 es->s_mtime = cpu_to_le32(get_seconds());
1646 ext4_update_dynamic_rev(sb);
1647 if (sbi->s_journal)
1648 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1649
1650 ext4_commit_super(sb, 1);
1651 if (test_opt(sb, DEBUG))
1652 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1653 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1654 sb->s_blocksize,
1655 sbi->s_groups_count,
1656 EXT4_BLOCKS_PER_GROUP(sb),
1657 EXT4_INODES_PER_GROUP(sb),
1658 sbi->s_mount_opt);
1659
1660 if (EXT4_SB(sb)->s_journal) {
1661 ext4_msg(sb, KERN_INFO, "%s journal on %s",
1662 EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1663 "external", EXT4_SB(sb)->s_journal->j_devname);
1664 } else {
1665 ext4_msg(sb, KERN_INFO, "no journal");
1666 }
1667 return res;
1668 }
1669
1670 static int ext4_fill_flex_info(struct super_block *sb)
1671 {
1672 struct ext4_sb_info *sbi = EXT4_SB(sb);
1673 struct ext4_group_desc *gdp = NULL;
1674 ext4_group_t flex_group_count;
1675 ext4_group_t flex_group;
1676 int groups_per_flex = 0;
1677 size_t size;
1678 int i;
1679
1680 if (!sbi->s_es->s_log_groups_per_flex) {
1681 sbi->s_log_groups_per_flex = 0;
1682 return 1;
1683 }
1684
1685 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1686 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1687
1688 /* We allocate both existing and potentially added groups */
1689 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1690 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1691 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1692 size = flex_group_count * sizeof(struct flex_groups);
1693 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1694 if (sbi->s_flex_groups == NULL) {
1695 sbi->s_flex_groups = vmalloc(size);
1696 if (sbi->s_flex_groups)
1697 memset(sbi->s_flex_groups, 0, size);
1698 }
1699 if (sbi->s_flex_groups == NULL) {
1700 ext4_msg(sb, KERN_ERR, "not enough memory for "
1701 "%u flex groups", flex_group_count);
1702 goto failed;
1703 }
1704
1705 for (i = 0; i < sbi->s_groups_count; i++) {
1706 gdp = ext4_get_group_desc(sb, i, NULL);
1707
1708 flex_group = ext4_flex_group(sbi, i);
1709 atomic_set(&sbi->s_flex_groups[flex_group].free_inodes,
1710 ext4_free_inodes_count(sb, gdp));
1711 atomic_set(&sbi->s_flex_groups[flex_group].free_blocks,
1712 ext4_free_blks_count(sb, gdp));
1713 atomic_set(&sbi->s_flex_groups[flex_group].used_dirs,
1714 ext4_used_dirs_count(sb, gdp));
1715 }
1716
1717 return 1;
1718 failed:
1719 return 0;
1720 }
1721
1722 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1723 struct ext4_group_desc *gdp)
1724 {
1725 __u16 crc = 0;
1726
1727 if (sbi->s_es->s_feature_ro_compat &
1728 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1729 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1730 __le32 le_group = cpu_to_le32(block_group);
1731
1732 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1733 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1734 crc = crc16(crc, (__u8 *)gdp, offset);
1735 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1736 /* for checksum of struct ext4_group_desc do the rest...*/
1737 if ((sbi->s_es->s_feature_incompat &
1738 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1739 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1740 crc = crc16(crc, (__u8 *)gdp + offset,
1741 le16_to_cpu(sbi->s_es->s_desc_size) -
1742 offset);
1743 }
1744
1745 return cpu_to_le16(crc);
1746 }
1747
1748 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1749 struct ext4_group_desc *gdp)
1750 {
1751 if ((sbi->s_es->s_feature_ro_compat &
1752 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1753 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1754 return 0;
1755
1756 return 1;
1757 }
1758
1759 /* Called at mount-time, super-block is locked */
1760 static int ext4_check_descriptors(struct super_block *sb)
1761 {
1762 struct ext4_sb_info *sbi = EXT4_SB(sb);
1763 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1764 ext4_fsblk_t last_block;
1765 ext4_fsblk_t block_bitmap;
1766 ext4_fsblk_t inode_bitmap;
1767 ext4_fsblk_t inode_table;
1768 int flexbg_flag = 0;
1769 ext4_group_t i;
1770
1771 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1772 flexbg_flag = 1;
1773
1774 ext4_debug("Checking group descriptors");
1775
1776 for (i = 0; i < sbi->s_groups_count; i++) {
1777 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1778
1779 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1780 last_block = ext4_blocks_count(sbi->s_es) - 1;
1781 else
1782 last_block = first_block +
1783 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1784
1785 block_bitmap = ext4_block_bitmap(sb, gdp);
1786 if (block_bitmap < first_block || block_bitmap > last_block) {
1787 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1788 "Block bitmap for group %u not in group "
1789 "(block %llu)!", i, block_bitmap);
1790 return 0;
1791 }
1792 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1793 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1794 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1795 "Inode bitmap for group %u not in group "
1796 "(block %llu)!", i, inode_bitmap);
1797 return 0;
1798 }
1799 inode_table = ext4_inode_table(sb, gdp);
1800 if (inode_table < first_block ||
1801 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1802 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1803 "Inode table for group %u not in group "
1804 "(block %llu)!", i, inode_table);
1805 return 0;
1806 }
1807 ext4_lock_group(sb, i);
1808 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1809 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1810 "Checksum for group %u failed (%u!=%u)",
1811 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1812 gdp)), le16_to_cpu(gdp->bg_checksum));
1813 if (!(sb->s_flags & MS_RDONLY)) {
1814 ext4_unlock_group(sb, i);
1815 return 0;
1816 }
1817 }
1818 ext4_unlock_group(sb, i);
1819 if (!flexbg_flag)
1820 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1821 }
1822
1823 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1824 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
1825 return 1;
1826 }
1827
1828 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1829 * the superblock) which were deleted from all directories, but held open by
1830 * a process at the time of a crash. We walk the list and try to delete these
1831 * inodes at recovery time (only with a read-write filesystem).
1832 *
1833 * In order to keep the orphan inode chain consistent during traversal (in
1834 * case of crash during recovery), we link each inode into the superblock
1835 * orphan list_head and handle it the same way as an inode deletion during
1836 * normal operation (which journals the operations for us).
1837 *
1838 * We only do an iget() and an iput() on each inode, which is very safe if we
1839 * accidentally point at an in-use or already deleted inode. The worst that
1840 * can happen in this case is that we get a "bit already cleared" message from
1841 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1842 * e2fsck was run on this filesystem, and it must have already done the orphan
1843 * inode cleanup for us, so we can safely abort without any further action.
1844 */
1845 static void ext4_orphan_cleanup(struct super_block *sb,
1846 struct ext4_super_block *es)
1847 {
1848 unsigned int s_flags = sb->s_flags;
1849 int nr_orphans = 0, nr_truncates = 0;
1850 #ifdef CONFIG_QUOTA
1851 int i;
1852 #endif
1853 if (!es->s_last_orphan) {
1854 jbd_debug(4, "no orphan inodes to clean up\n");
1855 return;
1856 }
1857
1858 if (bdev_read_only(sb->s_bdev)) {
1859 ext4_msg(sb, KERN_ERR, "write access "
1860 "unavailable, skipping orphan cleanup");
1861 return;
1862 }
1863
1864 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1865 if (es->s_last_orphan)
1866 jbd_debug(1, "Errors on filesystem, "
1867 "clearing orphan list.\n");
1868 es->s_last_orphan = 0;
1869 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1870 return;
1871 }
1872
1873 if (s_flags & MS_RDONLY) {
1874 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1875 sb->s_flags &= ~MS_RDONLY;
1876 }
1877 #ifdef CONFIG_QUOTA
1878 /* Needed for iput() to work correctly and not trash data */
1879 sb->s_flags |= MS_ACTIVE;
1880 /* Turn on quotas so that they are updated correctly */
1881 for (i = 0; i < MAXQUOTAS; i++) {
1882 if (EXT4_SB(sb)->s_qf_names[i]) {
1883 int ret = ext4_quota_on_mount(sb, i);
1884 if (ret < 0)
1885 ext4_msg(sb, KERN_ERR,
1886 "Cannot turn on journaled "
1887 "quota: error %d", ret);
1888 }
1889 }
1890 #endif
1891
1892 while (es->s_last_orphan) {
1893 struct inode *inode;
1894
1895 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1896 if (IS_ERR(inode)) {
1897 es->s_last_orphan = 0;
1898 break;
1899 }
1900
1901 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1902 vfs_dq_init(inode);
1903 if (inode->i_nlink) {
1904 ext4_msg(sb, KERN_DEBUG,
1905 "%s: truncating inode %lu to %lld bytes",
1906 __func__, inode->i_ino, inode->i_size);
1907 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1908 inode->i_ino, inode->i_size);
1909 ext4_truncate(inode);
1910 nr_truncates++;
1911 } else {
1912 ext4_msg(sb, KERN_DEBUG,
1913 "%s: deleting unreferenced inode %lu",
1914 __func__, inode->i_ino);
1915 jbd_debug(2, "deleting unreferenced inode %lu\n",
1916 inode->i_ino);
1917 nr_orphans++;
1918 }
1919 iput(inode); /* The delete magic happens here! */
1920 }
1921
1922 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1923
1924 if (nr_orphans)
1925 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1926 PLURAL(nr_orphans));
1927 if (nr_truncates)
1928 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1929 PLURAL(nr_truncates));
1930 #ifdef CONFIG_QUOTA
1931 /* Turn quotas off */
1932 for (i = 0; i < MAXQUOTAS; i++) {
1933 if (sb_dqopt(sb)->files[i])
1934 vfs_quota_off(sb, i, 0);
1935 }
1936 #endif
1937 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1938 }
1939
1940 /*
1941 * Maximal extent format file size.
1942 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1943 * extent format containers, within a sector_t, and within i_blocks
1944 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1945 * so that won't be a limiting factor.
1946 *
1947 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1948 */
1949 static loff_t ext4_max_size(int blkbits, int has_huge_files)
1950 {
1951 loff_t res;
1952 loff_t upper_limit = MAX_LFS_FILESIZE;
1953
1954 /* small i_blocks in vfs inode? */
1955 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1956 /*
1957 * CONFIG_LBD is not enabled implies the inode
1958 * i_block represent total blocks in 512 bytes
1959 * 32 == size of vfs inode i_blocks * 8
1960 */
1961 upper_limit = (1LL << 32) - 1;
1962
1963 /* total blocks in file system block size */
1964 upper_limit >>= (blkbits - 9);
1965 upper_limit <<= blkbits;
1966 }
1967
1968 /* 32-bit extent-start container, ee_block */
1969 res = 1LL << 32;
1970 res <<= blkbits;
1971 res -= 1;
1972
1973 /* Sanity check against vm- & vfs- imposed limits */
1974 if (res > upper_limit)
1975 res = upper_limit;
1976
1977 return res;
1978 }
1979
1980 /*
1981 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1982 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1983 * We need to be 1 filesystem block less than the 2^48 sector limit.
1984 */
1985 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
1986 {
1987 loff_t res = EXT4_NDIR_BLOCKS;
1988 int meta_blocks;
1989 loff_t upper_limit;
1990 /* This is calculated to be the largest file size for a dense, block
1991 * mapped file such that the file's total number of 512-byte sectors,
1992 * including data and all indirect blocks, does not exceed (2^48 - 1).
1993 *
1994 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
1995 * number of 512-byte sectors of the file.
1996 */
1997
1998 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1999 /*
2000 * !has_huge_files or CONFIG_LBD not enabled implies that
2001 * the inode i_block field represents total file blocks in
2002 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2003 */
2004 upper_limit = (1LL << 32) - 1;
2005
2006 /* total blocks in file system block size */
2007 upper_limit >>= (bits - 9);
2008
2009 } else {
2010 /*
2011 * We use 48 bit ext4_inode i_blocks
2012 * With EXT4_HUGE_FILE_FL set the i_blocks
2013 * represent total number of blocks in
2014 * file system block size
2015 */
2016 upper_limit = (1LL << 48) - 1;
2017
2018 }
2019
2020 /* indirect blocks */
2021 meta_blocks = 1;
2022 /* double indirect blocks */
2023 meta_blocks += 1 + (1LL << (bits-2));
2024 /* tripple indirect blocks */
2025 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2026
2027 upper_limit -= meta_blocks;
2028 upper_limit <<= bits;
2029
2030 res += 1LL << (bits-2);
2031 res += 1LL << (2*(bits-2));
2032 res += 1LL << (3*(bits-2));
2033 res <<= bits;
2034 if (res > upper_limit)
2035 res = upper_limit;
2036
2037 if (res > MAX_LFS_FILESIZE)
2038 res = MAX_LFS_FILESIZE;
2039
2040 return res;
2041 }
2042
2043 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2044 ext4_fsblk_t logical_sb_block, int nr)
2045 {
2046 struct ext4_sb_info *sbi = EXT4_SB(sb);
2047 ext4_group_t bg, first_meta_bg;
2048 int has_super = 0;
2049
2050 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2051
2052 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2053 nr < first_meta_bg)
2054 return logical_sb_block + nr + 1;
2055 bg = sbi->s_desc_per_block * nr;
2056 if (ext4_bg_has_super(sb, bg))
2057 has_super = 1;
2058
2059 return (has_super + ext4_group_first_block_no(sb, bg));
2060 }
2061
2062 /**
2063 * ext4_get_stripe_size: Get the stripe size.
2064 * @sbi: In memory super block info
2065 *
2066 * If we have specified it via mount option, then
2067 * use the mount option value. If the value specified at mount time is
2068 * greater than the blocks per group use the super block value.
2069 * If the super block value is greater than blocks per group return 0.
2070 * Allocator needs it be less than blocks per group.
2071 *
2072 */
2073 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2074 {
2075 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2076 unsigned long stripe_width =
2077 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2078
2079 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2080 return sbi->s_stripe;
2081
2082 if (stripe_width <= sbi->s_blocks_per_group)
2083 return stripe_width;
2084
2085 if (stride <= sbi->s_blocks_per_group)
2086 return stride;
2087
2088 return 0;
2089 }
2090
2091 /* sysfs supprt */
2092
2093 struct ext4_attr {
2094 struct attribute attr;
2095 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2096 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2097 const char *, size_t);
2098 int offset;
2099 };
2100
2101 static int parse_strtoul(const char *buf,
2102 unsigned long max, unsigned long *value)
2103 {
2104 char *endp;
2105
2106 while (*buf && isspace(*buf))
2107 buf++;
2108 *value = simple_strtoul(buf, &endp, 0);
2109 while (*endp && isspace(*endp))
2110 endp++;
2111 if (*endp || *value > max)
2112 return -EINVAL;
2113
2114 return 0;
2115 }
2116
2117 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2118 struct ext4_sb_info *sbi,
2119 char *buf)
2120 {
2121 return snprintf(buf, PAGE_SIZE, "%llu\n",
2122 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2123 }
2124
2125 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2126 struct ext4_sb_info *sbi, char *buf)
2127 {
2128 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2129
2130 return snprintf(buf, PAGE_SIZE, "%lu\n",
2131 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2132 sbi->s_sectors_written_start) >> 1);
2133 }
2134
2135 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2136 struct ext4_sb_info *sbi, char *buf)
2137 {
2138 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2139
2140 return snprintf(buf, PAGE_SIZE, "%llu\n",
2141 sbi->s_kbytes_written +
2142 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2143 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2144 }
2145
2146 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2147 struct ext4_sb_info *sbi,
2148 const char *buf, size_t count)
2149 {
2150 unsigned long t;
2151
2152 if (parse_strtoul(buf, 0x40000000, &t))
2153 return -EINVAL;
2154
2155 if (!is_power_of_2(t))
2156 return -EINVAL;
2157
2158 sbi->s_inode_readahead_blks = t;
2159 return count;
2160 }
2161
2162 static ssize_t sbi_ui_show(struct ext4_attr *a,
2163 struct ext4_sb_info *sbi, char *buf)
2164 {
2165 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2166
2167 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2168 }
2169
2170 static ssize_t sbi_ui_store(struct ext4_attr *a,
2171 struct ext4_sb_info *sbi,
2172 const char *buf, size_t count)
2173 {
2174 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2175 unsigned long t;
2176
2177 if (parse_strtoul(buf, 0xffffffff, &t))
2178 return -EINVAL;
2179 *ui = t;
2180 return count;
2181 }
2182
2183 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2184 static struct ext4_attr ext4_attr_##_name = { \
2185 .attr = {.name = __stringify(_name), .mode = _mode }, \
2186 .show = _show, \
2187 .store = _store, \
2188 .offset = offsetof(struct ext4_sb_info, _elname), \
2189 }
2190 #define EXT4_ATTR(name, mode, show, store) \
2191 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2192
2193 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2194 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2195 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2196 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2197 #define ATTR_LIST(name) &ext4_attr_##name.attr
2198
2199 EXT4_RO_ATTR(delayed_allocation_blocks);
2200 EXT4_RO_ATTR(session_write_kbytes);
2201 EXT4_RO_ATTR(lifetime_write_kbytes);
2202 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2203 inode_readahead_blks_store, s_inode_readahead_blks);
2204 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2205 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2206 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2207 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2208 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2209 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2210
2211 static struct attribute *ext4_attrs[] = {
2212 ATTR_LIST(delayed_allocation_blocks),
2213 ATTR_LIST(session_write_kbytes),
2214 ATTR_LIST(lifetime_write_kbytes),
2215 ATTR_LIST(inode_readahead_blks),
2216 ATTR_LIST(mb_stats),
2217 ATTR_LIST(mb_max_to_scan),
2218 ATTR_LIST(mb_min_to_scan),
2219 ATTR_LIST(mb_order2_req),
2220 ATTR_LIST(mb_stream_req),
2221 ATTR_LIST(mb_group_prealloc),
2222 NULL,
2223 };
2224
2225 static ssize_t ext4_attr_show(struct kobject *kobj,
2226 struct attribute *attr, char *buf)
2227 {
2228 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2229 s_kobj);
2230 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2231
2232 return a->show ? a->show(a, sbi, buf) : 0;
2233 }
2234
2235 static ssize_t ext4_attr_store(struct kobject *kobj,
2236 struct attribute *attr,
2237 const char *buf, size_t len)
2238 {
2239 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2240 s_kobj);
2241 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2242
2243 return a->store ? a->store(a, sbi, buf, len) : 0;
2244 }
2245
2246 static void ext4_sb_release(struct kobject *kobj)
2247 {
2248 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2249 s_kobj);
2250 complete(&sbi->s_kobj_unregister);
2251 }
2252
2253
2254 static struct sysfs_ops ext4_attr_ops = {
2255 .show = ext4_attr_show,
2256 .store = ext4_attr_store,
2257 };
2258
2259 static struct kobj_type ext4_ktype = {
2260 .default_attrs = ext4_attrs,
2261 .sysfs_ops = &ext4_attr_ops,
2262 .release = ext4_sb_release,
2263 };
2264
2265 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2266 __releases(kernel_lock)
2267 __acquires(kernel_lock)
2268 {
2269 struct buffer_head *bh;
2270 struct ext4_super_block *es = NULL;
2271 struct ext4_sb_info *sbi;
2272 ext4_fsblk_t block;
2273 ext4_fsblk_t sb_block = get_sb_block(&data);
2274 ext4_fsblk_t logical_sb_block;
2275 unsigned long offset = 0;
2276 unsigned long journal_devnum = 0;
2277 unsigned long def_mount_opts;
2278 struct inode *root;
2279 char *cp;
2280 const char *descr;
2281 int ret = -EINVAL;
2282 int blocksize;
2283 unsigned int db_count;
2284 unsigned int i;
2285 int needs_recovery, has_huge_files;
2286 int features;
2287 __u64 blocks_count;
2288 int err;
2289 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2290
2291 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2292 if (!sbi)
2293 return -ENOMEM;
2294
2295 sbi->s_blockgroup_lock =
2296 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2297 if (!sbi->s_blockgroup_lock) {
2298 kfree(sbi);
2299 return -ENOMEM;
2300 }
2301 sb->s_fs_info = sbi;
2302 sbi->s_mount_opt = 0;
2303 sbi->s_resuid = EXT4_DEF_RESUID;
2304 sbi->s_resgid = EXT4_DEF_RESGID;
2305 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2306 sbi->s_sb_block = sb_block;
2307 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2308 sectors[1]);
2309
2310 unlock_kernel();
2311
2312 /* Cleanup superblock name */
2313 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2314 *cp = '!';
2315
2316 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2317 if (!blocksize) {
2318 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
2319 goto out_fail;
2320 }
2321
2322 /*
2323 * The ext4 superblock will not be buffer aligned for other than 1kB
2324 * block sizes. We need to calculate the offset from buffer start.
2325 */
2326 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
2327 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2328 offset = do_div(logical_sb_block, blocksize);
2329 } else {
2330 logical_sb_block = sb_block;
2331 }
2332
2333 if (!(bh = sb_bread(sb, logical_sb_block))) {
2334 ext4_msg(sb, KERN_ERR, "unable to read superblock");
2335 goto out_fail;
2336 }
2337 /*
2338 * Note: s_es must be initialized as soon as possible because
2339 * some ext4 macro-instructions depend on its value
2340 */
2341 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2342 sbi->s_es = es;
2343 sb->s_magic = le16_to_cpu(es->s_magic);
2344 if (sb->s_magic != EXT4_SUPER_MAGIC)
2345 goto cantfind_ext4;
2346 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
2347
2348 /* Set defaults before we parse the mount options */
2349 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
2350 if (def_mount_opts & EXT4_DEFM_DEBUG)
2351 set_opt(sbi->s_mount_opt, DEBUG);
2352 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
2353 set_opt(sbi->s_mount_opt, GRPID);
2354 if (def_mount_opts & EXT4_DEFM_UID16)
2355 set_opt(sbi->s_mount_opt, NO_UID32);
2356 #ifdef CONFIG_EXT4_FS_XATTR
2357 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
2358 set_opt(sbi->s_mount_opt, XATTR_USER);
2359 #endif
2360 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2361 if (def_mount_opts & EXT4_DEFM_ACL)
2362 set_opt(sbi->s_mount_opt, POSIX_ACL);
2363 #endif
2364 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2365 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2366 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2367 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2368 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2369 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2370
2371 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2372 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2373 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2374 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2375 else
2376 set_opt(sbi->s_mount_opt, ERRORS_RO);
2377
2378 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2379 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2380 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2381 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2382 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
2383 sbi->s_mb_history_max = default_mb_history_length;
2384
2385 set_opt(sbi->s_mount_opt, BARRIER);
2386
2387 /*
2388 * enable delayed allocation by default
2389 * Use -o nodelalloc to turn it off
2390 */
2391 set_opt(sbi->s_mount_opt, DELALLOC);
2392
2393 if (!parse_options((char *) data, sb, &journal_devnum,
2394 &journal_ioprio, NULL, 0))
2395 goto failed_mount;
2396
2397 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2398 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2399
2400 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2401 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2402 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2403 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2404 ext4_msg(sb, KERN_WARNING,
2405 "feature flags set on rev 0 fs, "
2406 "running e2fsck is recommended");
2407
2408 /*
2409 * Check feature flags regardless of the revision level, since we
2410 * previously didn't change the revision level when setting the flags,
2411 * so there is a chance incompat flags are set on a rev 0 filesystem.
2412 */
2413 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2414 if (features) {
2415 ext4_msg(sb, KERN_ERR,
2416 "Couldn't mount because of "
2417 "unsupported optional features (%x)",
2418 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2419 ~EXT4_FEATURE_INCOMPAT_SUPP));
2420 goto failed_mount;
2421 }
2422 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2423 if (!(sb->s_flags & MS_RDONLY) && features) {
2424 ext4_msg(sb, KERN_ERR,
2425 "Couldn't mount RDWR because of "
2426 "unsupported optional features (%x)",
2427 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2428 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2429 goto failed_mount;
2430 }
2431 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2432 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2433 if (has_huge_files) {
2434 /*
2435 * Large file size enabled file system can only be
2436 * mount if kernel is build with CONFIG_LBD
2437 */
2438 if (sizeof(root->i_blocks) < sizeof(u64) &&
2439 !(sb->s_flags & MS_RDONLY)) {
2440 ext4_msg(sb, KERN_ERR, "Filesystem with huge "
2441 "files cannot be mounted read-write "
2442 "without CONFIG_LBD");
2443 goto failed_mount;
2444 }
2445 }
2446 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2447
2448 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2449 blocksize > EXT4_MAX_BLOCK_SIZE) {
2450 ext4_msg(sb, KERN_ERR,
2451 "Unsupported filesystem blocksize %d", blocksize);
2452 goto failed_mount;
2453 }
2454
2455 if (sb->s_blocksize != blocksize) {
2456 /* Validate the filesystem blocksize */
2457 if (!sb_set_blocksize(sb, blocksize)) {
2458 ext4_msg(sb, KERN_ERR, "bad block size %d",
2459 blocksize);
2460 goto failed_mount;
2461 }
2462
2463 brelse(bh);
2464 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2465 offset = do_div(logical_sb_block, blocksize);
2466 bh = sb_bread(sb, logical_sb_block);
2467 if (!bh) {
2468 ext4_msg(sb, KERN_ERR,
2469 "Can't read superblock on 2nd try");
2470 goto failed_mount;
2471 }
2472 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2473 sbi->s_es = es;
2474 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2475 ext4_msg(sb, KERN_ERR,
2476 "Magic mismatch, very weird!");
2477 goto failed_mount;
2478 }
2479 }
2480
2481 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2482 has_huge_files);
2483 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2484
2485 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2486 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2487 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2488 } else {
2489 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2490 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2491 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2492 (!is_power_of_2(sbi->s_inode_size)) ||
2493 (sbi->s_inode_size > blocksize)) {
2494 ext4_msg(sb, KERN_ERR,
2495 "unsupported inode size: %d",
2496 sbi->s_inode_size);
2497 goto failed_mount;
2498 }
2499 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2500 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2501 }
2502
2503 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2504 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2505 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2506 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2507 !is_power_of_2(sbi->s_desc_size)) {
2508 ext4_msg(sb, KERN_ERR,
2509 "unsupported descriptor size %lu",
2510 sbi->s_desc_size);
2511 goto failed_mount;
2512 }
2513 } else
2514 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2515
2516 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2517 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2518 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2519 goto cantfind_ext4;
2520
2521 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2522 if (sbi->s_inodes_per_block == 0)
2523 goto cantfind_ext4;
2524 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2525 sbi->s_inodes_per_block;
2526 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2527 sbi->s_sbh = bh;
2528 sbi->s_mount_state = le16_to_cpu(es->s_state);
2529 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2530 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2531
2532 for (i = 0; i < 4; i++)
2533 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2534 sbi->s_def_hash_version = es->s_def_hash_version;
2535 i = le32_to_cpu(es->s_flags);
2536 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2537 sbi->s_hash_unsigned = 3;
2538 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2539 #ifdef __CHAR_UNSIGNED__
2540 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2541 sbi->s_hash_unsigned = 3;
2542 #else
2543 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2544 #endif
2545 sb->s_dirt = 1;
2546 }
2547
2548 if (sbi->s_blocks_per_group > blocksize * 8) {
2549 ext4_msg(sb, KERN_ERR,
2550 "#blocks per group too big: %lu",
2551 sbi->s_blocks_per_group);
2552 goto failed_mount;
2553 }
2554 if (sbi->s_inodes_per_group > blocksize * 8) {
2555 ext4_msg(sb, KERN_ERR,
2556 "#inodes per group too big: %lu",
2557 sbi->s_inodes_per_group);
2558 goto failed_mount;
2559 }
2560
2561 if (ext4_blocks_count(es) >
2562 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2563 ext4_msg(sb, KERN_ERR, "filesystem"
2564 " too large to mount safely");
2565 if (sizeof(sector_t) < 8)
2566 ext4_msg(sb, KERN_WARNING, "CONFIG_LBD not enabled");
2567 goto failed_mount;
2568 }
2569
2570 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2571 goto cantfind_ext4;
2572
2573 /* check blocks count against device size */
2574 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2575 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
2576 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2577 "exceeds size of device (%llu blocks)",
2578 ext4_blocks_count(es), blocks_count);
2579 goto failed_mount;
2580 }
2581
2582 /*
2583 * It makes no sense for the first data block to be beyond the end
2584 * of the filesystem.
2585 */
2586 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2587 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2588 "block %u is beyond end of filesystem (%llu)",
2589 le32_to_cpu(es->s_first_data_block),
2590 ext4_blocks_count(es));
2591 goto failed_mount;
2592 }
2593 blocks_count = (ext4_blocks_count(es) -
2594 le32_to_cpu(es->s_first_data_block) +
2595 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2596 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2597 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2598 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
2599 "(block count %llu, first data block %u, "
2600 "blocks per group %lu)", sbi->s_groups_count,
2601 ext4_blocks_count(es),
2602 le32_to_cpu(es->s_first_data_block),
2603 EXT4_BLOCKS_PER_GROUP(sb));
2604 goto failed_mount;
2605 }
2606 sbi->s_groups_count = blocks_count;
2607 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2608 EXT4_DESC_PER_BLOCK(sb);
2609 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2610 GFP_KERNEL);
2611 if (sbi->s_group_desc == NULL) {
2612 ext4_msg(sb, KERN_ERR, "not enough memory");
2613 goto failed_mount;
2614 }
2615
2616 #ifdef CONFIG_PROC_FS
2617 if (ext4_proc_root)
2618 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2619 #endif
2620
2621 bgl_lock_init(sbi->s_blockgroup_lock);
2622
2623 for (i = 0; i < db_count; i++) {
2624 block = descriptor_loc(sb, logical_sb_block, i);
2625 sbi->s_group_desc[i] = sb_bread(sb, block);
2626 if (!sbi->s_group_desc[i]) {
2627 ext4_msg(sb, KERN_ERR,
2628 "can't read group descriptor %d", i);
2629 db_count = i;
2630 goto failed_mount2;
2631 }
2632 }
2633 if (!ext4_check_descriptors(sb)) {
2634 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
2635 goto failed_mount2;
2636 }
2637 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2638 if (!ext4_fill_flex_info(sb)) {
2639 ext4_msg(sb, KERN_ERR,
2640 "unable to initialize "
2641 "flex_bg meta info!");
2642 goto failed_mount2;
2643 }
2644
2645 sbi->s_gdb_count = db_count;
2646 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2647 spin_lock_init(&sbi->s_next_gen_lock);
2648
2649 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2650 ext4_count_free_blocks(sb));
2651 if (!err) {
2652 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2653 ext4_count_free_inodes(sb));
2654 }
2655 if (!err) {
2656 err = percpu_counter_init(&sbi->s_dirs_counter,
2657 ext4_count_dirs(sb));
2658 }
2659 if (!err) {
2660 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2661 }
2662 if (err) {
2663 ext4_msg(sb, KERN_ERR, "insufficient memory");
2664 goto failed_mount3;
2665 }
2666
2667 sbi->s_stripe = ext4_get_stripe_size(sbi);
2668
2669 /*
2670 * set up enough so that it can read an inode
2671 */
2672 if (!test_opt(sb, NOLOAD) &&
2673 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2674 sb->s_op = &ext4_sops;
2675 else
2676 sb->s_op = &ext4_nojournal_sops;
2677 sb->s_export_op = &ext4_export_ops;
2678 sb->s_xattr = ext4_xattr_handlers;
2679 #ifdef CONFIG_QUOTA
2680 sb->s_qcop = &ext4_qctl_operations;
2681 sb->dq_op = &ext4_quota_operations;
2682 #endif
2683 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2684 mutex_init(&sbi->s_orphan_lock);
2685 mutex_init(&sbi->s_resize_lock);
2686
2687 sb->s_root = NULL;
2688
2689 needs_recovery = (es->s_last_orphan != 0 ||
2690 EXT4_HAS_INCOMPAT_FEATURE(sb,
2691 EXT4_FEATURE_INCOMPAT_RECOVER));
2692
2693 /*
2694 * The first inode we look at is the journal inode. Don't try
2695 * root first: it may be modified in the journal!
2696 */
2697 if (!test_opt(sb, NOLOAD) &&
2698 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2699 if (ext4_load_journal(sb, es, journal_devnum))
2700 goto failed_mount3;
2701 if (!(sb->s_flags & MS_RDONLY) &&
2702 EXT4_SB(sb)->s_journal->j_failed_commit) {
2703 ext4_msg(sb, KERN_CRIT, "error: "
2704 "ext4_fill_super: Journal transaction "
2705 "%u is corrupt",
2706 EXT4_SB(sb)->s_journal->j_failed_commit);
2707 if (test_opt(sb, ERRORS_RO)) {
2708 ext4_msg(sb, KERN_CRIT,
2709 "Mounting filesystem read-only");
2710 sb->s_flags |= MS_RDONLY;
2711 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2712 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2713 }
2714 if (test_opt(sb, ERRORS_PANIC)) {
2715 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2716 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2717 ext4_commit_super(sb, 1);
2718 goto failed_mount4;
2719 }
2720 }
2721 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2722 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2723 ext4_msg(sb, KERN_ERR, "required journal recovery "
2724 "suppressed and not mounted read-only");
2725 goto failed_mount4;
2726 } else {
2727 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2728 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2729 sbi->s_journal = NULL;
2730 needs_recovery = 0;
2731 goto no_journal;
2732 }
2733
2734 if (ext4_blocks_count(es) > 0xffffffffULL &&
2735 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2736 JBD2_FEATURE_INCOMPAT_64BIT)) {
2737 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
2738 goto failed_mount4;
2739 }
2740
2741 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2742 jbd2_journal_set_features(sbi->s_journal,
2743 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2744 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2745 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2746 jbd2_journal_set_features(sbi->s_journal,
2747 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2748 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2749 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2750 } else {
2751 jbd2_journal_clear_features(sbi->s_journal,
2752 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2753 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2754 }
2755
2756 /* We have now updated the journal if required, so we can
2757 * validate the data journaling mode. */
2758 switch (test_opt(sb, DATA_FLAGS)) {
2759 case 0:
2760 /* No mode set, assume a default based on the journal
2761 * capabilities: ORDERED_DATA if the journal can
2762 * cope, else JOURNAL_DATA
2763 */
2764 if (jbd2_journal_check_available_features
2765 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2766 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2767 else
2768 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2769 break;
2770
2771 case EXT4_MOUNT_ORDERED_DATA:
2772 case EXT4_MOUNT_WRITEBACK_DATA:
2773 if (!jbd2_journal_check_available_features
2774 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2775 ext4_msg(sb, KERN_ERR, "Journal does not support "
2776 "requested data journaling mode");
2777 goto failed_mount4;
2778 }
2779 default:
2780 break;
2781 }
2782 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
2783
2784 no_journal:
2785
2786 if (test_opt(sb, NOBH)) {
2787 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2788 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2789 "its supported only with writeback mode");
2790 clear_opt(sbi->s_mount_opt, NOBH);
2791 }
2792 }
2793 /*
2794 * The jbd2_journal_load will have done any necessary log recovery,
2795 * so we can safely mount the rest of the filesystem now.
2796 */
2797
2798 root = ext4_iget(sb, EXT4_ROOT_INO);
2799 if (IS_ERR(root)) {
2800 ext4_msg(sb, KERN_ERR, "get root inode failed");
2801 ret = PTR_ERR(root);
2802 goto failed_mount4;
2803 }
2804 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2805 iput(root);
2806 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
2807 goto failed_mount4;
2808 }
2809 sb->s_root = d_alloc_root(root);
2810 if (!sb->s_root) {
2811 ext4_msg(sb, KERN_ERR, "get root dentry failed");
2812 iput(root);
2813 ret = -ENOMEM;
2814 goto failed_mount4;
2815 }
2816
2817 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2818
2819 /* determine the minimum size of new large inodes, if present */
2820 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2821 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2822 EXT4_GOOD_OLD_INODE_SIZE;
2823 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2824 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2825 if (sbi->s_want_extra_isize <
2826 le16_to_cpu(es->s_want_extra_isize))
2827 sbi->s_want_extra_isize =
2828 le16_to_cpu(es->s_want_extra_isize);
2829 if (sbi->s_want_extra_isize <
2830 le16_to_cpu(es->s_min_extra_isize))
2831 sbi->s_want_extra_isize =
2832 le16_to_cpu(es->s_min_extra_isize);
2833 }
2834 }
2835 /* Check if enough inode space is available */
2836 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2837 sbi->s_inode_size) {
2838 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2839 EXT4_GOOD_OLD_INODE_SIZE;
2840 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2841 "available");
2842 }
2843
2844 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2845 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2846 "requested data journaling mode");
2847 clear_opt(sbi->s_mount_opt, DELALLOC);
2848 } else if (test_opt(sb, DELALLOC))
2849 ext4_msg(sb, KERN_INFO, "delayed allocation enabled");
2850
2851 err = ext4_setup_system_zone(sb);
2852 if (err) {
2853 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2854 "zone (%d)\n", err);
2855 goto failed_mount4;
2856 }
2857
2858 ext4_ext_init(sb);
2859 err = ext4_mb_init(sb, needs_recovery);
2860 if (err) {
2861 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2862 err);
2863 goto failed_mount4;
2864 }
2865
2866 sbi->s_kobj.kset = ext4_kset;
2867 init_completion(&sbi->s_kobj_unregister);
2868 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2869 "%s", sb->s_id);
2870 if (err) {
2871 ext4_mb_release(sb);
2872 ext4_ext_release(sb);
2873 goto failed_mount4;
2874 };
2875
2876 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2877 ext4_orphan_cleanup(sb, es);
2878 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2879 if (needs_recovery) {
2880 ext4_msg(sb, KERN_INFO, "recovery complete");
2881 ext4_mark_recovery_complete(sb, es);
2882 }
2883 if (EXT4_SB(sb)->s_journal) {
2884 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2885 descr = " journalled data mode";
2886 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2887 descr = " ordered data mode";
2888 else
2889 descr = " writeback data mode";
2890 } else
2891 descr = "out journal";
2892
2893 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
2894
2895 lock_kernel();
2896 return 0;
2897
2898 cantfind_ext4:
2899 if (!silent)
2900 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
2901 goto failed_mount;
2902
2903 failed_mount4:
2904 ext4_msg(sb, KERN_ERR, "mount failed");
2905 ext4_release_system_zone(sb);
2906 if (sbi->s_journal) {
2907 jbd2_journal_destroy(sbi->s_journal);
2908 sbi->s_journal = NULL;
2909 }
2910 failed_mount3:
2911 if (sbi->s_flex_groups) {
2912 if (is_vmalloc_addr(sbi->s_flex_groups))
2913 vfree(sbi->s_flex_groups);
2914 else
2915 kfree(sbi->s_flex_groups);
2916 }
2917 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2918 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2919 percpu_counter_destroy(&sbi->s_dirs_counter);
2920 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2921 failed_mount2:
2922 for (i = 0; i < db_count; i++)
2923 brelse(sbi->s_group_desc[i]);
2924 kfree(sbi->s_group_desc);
2925 failed_mount:
2926 if (sbi->s_proc) {
2927 remove_proc_entry(sb->s_id, ext4_proc_root);
2928 }
2929 #ifdef CONFIG_QUOTA
2930 for (i = 0; i < MAXQUOTAS; i++)
2931 kfree(sbi->s_qf_names[i]);
2932 #endif
2933 ext4_blkdev_remove(sbi);
2934 brelse(bh);
2935 out_fail:
2936 sb->s_fs_info = NULL;
2937 kfree(sbi->s_blockgroup_lock);
2938 kfree(sbi);
2939 lock_kernel();
2940 return ret;
2941 }
2942
2943 /*
2944 * Setup any per-fs journal parameters now. We'll do this both on
2945 * initial mount, once the journal has been initialised but before we've
2946 * done any recovery; and again on any subsequent remount.
2947 */
2948 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2949 {
2950 struct ext4_sb_info *sbi = EXT4_SB(sb);
2951
2952 journal->j_commit_interval = sbi->s_commit_interval;
2953 journal->j_min_batch_time = sbi->s_min_batch_time;
2954 journal->j_max_batch_time = sbi->s_max_batch_time;
2955
2956 spin_lock(&journal->j_state_lock);
2957 if (test_opt(sb, BARRIER))
2958 journal->j_flags |= JBD2_BARRIER;
2959 else
2960 journal->j_flags &= ~JBD2_BARRIER;
2961 if (test_opt(sb, DATA_ERR_ABORT))
2962 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2963 else
2964 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
2965 spin_unlock(&journal->j_state_lock);
2966 }
2967
2968 static journal_t *ext4_get_journal(struct super_block *sb,
2969 unsigned int journal_inum)
2970 {
2971 struct inode *journal_inode;
2972 journal_t *journal;
2973
2974 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2975
2976 /* First, test for the existence of a valid inode on disk. Bad
2977 * things happen if we iget() an unused inode, as the subsequent
2978 * iput() will try to delete it. */
2979
2980 journal_inode = ext4_iget(sb, journal_inum);
2981 if (IS_ERR(journal_inode)) {
2982 ext4_msg(sb, KERN_ERR, "no journal found");
2983 return NULL;
2984 }
2985 if (!journal_inode->i_nlink) {
2986 make_bad_inode(journal_inode);
2987 iput(journal_inode);
2988 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
2989 return NULL;
2990 }
2991
2992 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
2993 journal_inode, journal_inode->i_size);
2994 if (!S_ISREG(journal_inode->i_mode)) {
2995 ext4_msg(sb, KERN_ERR, "invalid journal inode");
2996 iput(journal_inode);
2997 return NULL;
2998 }
2999
3000 journal = jbd2_journal_init_inode(journal_inode);
3001 if (!journal) {
3002 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3003 iput(journal_inode);
3004 return NULL;
3005 }
3006 journal->j_private = sb;
3007 ext4_init_journal_params(sb, journal);
3008 return journal;
3009 }
3010
3011 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3012 dev_t j_dev)
3013 {
3014 struct buffer_head *bh;
3015 journal_t *journal;
3016 ext4_fsblk_t start;
3017 ext4_fsblk_t len;
3018 int hblock, blocksize;
3019 ext4_fsblk_t sb_block;
3020 unsigned long offset;
3021 struct ext4_super_block *es;
3022 struct block_device *bdev;
3023
3024 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3025
3026 bdev = ext4_blkdev_get(j_dev, sb);
3027 if (bdev == NULL)
3028 return NULL;
3029
3030 if (bd_claim(bdev, sb)) {
3031 ext4_msg(sb, KERN_ERR,
3032 "failed to claim external journal device");
3033 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3034 return NULL;
3035 }
3036
3037 blocksize = sb->s_blocksize;
3038 hblock = bdev_logical_block_size(bdev);
3039 if (blocksize < hblock) {
3040 ext4_msg(sb, KERN_ERR,
3041 "blocksize too small for journal device");
3042 goto out_bdev;
3043 }
3044
3045 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3046 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3047 set_blocksize(bdev, blocksize);
3048 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3049 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3050 "external journal");
3051 goto out_bdev;
3052 }
3053
3054 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3055 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3056 !(le32_to_cpu(es->s_feature_incompat) &
3057 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3058 ext4_msg(sb, KERN_ERR, "external journal has "
3059 "bad superblock");
3060 brelse(bh);
3061 goto out_bdev;
3062 }
3063
3064 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3065 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3066 brelse(bh);
3067 goto out_bdev;
3068 }
3069
3070 len = ext4_blocks_count(es);
3071 start = sb_block + 1;
3072 brelse(bh); /* we're done with the superblock */
3073
3074 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3075 start, len, blocksize);
3076 if (!journal) {
3077 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3078 goto out_bdev;
3079 }
3080 journal->j_private = sb;
3081 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3082 wait_on_buffer(journal->j_sb_buffer);
3083 if (!buffer_uptodate(journal->j_sb_buffer)) {
3084 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3085 goto out_journal;
3086 }
3087 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3088 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3089 "user (unsupported) - %d",
3090 be32_to_cpu(journal->j_superblock->s_nr_users));
3091 goto out_journal;
3092 }
3093 EXT4_SB(sb)->journal_bdev = bdev;
3094 ext4_init_journal_params(sb, journal);
3095 return journal;
3096
3097 out_journal:
3098 jbd2_journal_destroy(journal);
3099 out_bdev:
3100 ext4_blkdev_put(bdev);
3101 return NULL;
3102 }
3103
3104 static int ext4_load_journal(struct super_block *sb,
3105 struct ext4_super_block *es,
3106 unsigned long journal_devnum)
3107 {
3108 journal_t *journal;
3109 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3110 dev_t journal_dev;
3111 int err = 0;
3112 int really_read_only;
3113
3114 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3115
3116 if (journal_devnum &&
3117 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3118 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3119 "numbers have changed");
3120 journal_dev = new_decode_dev(journal_devnum);
3121 } else
3122 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3123
3124 really_read_only = bdev_read_only(sb->s_bdev);
3125
3126 /*
3127 * Are we loading a blank journal or performing recovery after a
3128 * crash? For recovery, we need to check in advance whether we
3129 * can get read-write access to the device.
3130 */
3131 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3132 if (sb->s_flags & MS_RDONLY) {
3133 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3134 "required on readonly filesystem");
3135 if (really_read_only) {
3136 ext4_msg(sb, KERN_ERR, "write access "
3137 "unavailable, cannot proceed");
3138 return -EROFS;
3139 }
3140 ext4_msg(sb, KERN_INFO, "write access will "
3141 "be enabled during recovery");
3142 }
3143 }
3144
3145 if (journal_inum && journal_dev) {
3146 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3147 "and inode journals!");
3148 return -EINVAL;
3149 }
3150
3151 if (journal_inum) {
3152 if (!(journal = ext4_get_journal(sb, journal_inum)))
3153 return -EINVAL;
3154 } else {
3155 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3156 return -EINVAL;
3157 }
3158
3159 if (journal->j_flags & JBD2_BARRIER)
3160 ext4_msg(sb, KERN_INFO, "barriers enabled");
3161 else
3162 ext4_msg(sb, KERN_INFO, "barriers disabled");
3163
3164 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3165 err = jbd2_journal_update_format(journal);
3166 if (err) {
3167 ext4_msg(sb, KERN_ERR, "error updating journal");
3168 jbd2_journal_destroy(journal);
3169 return err;
3170 }
3171 }
3172
3173 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3174 err = jbd2_journal_wipe(journal, !really_read_only);
3175 if (!err)
3176 err = jbd2_journal_load(journal);
3177
3178 if (err) {
3179 ext4_msg(sb, KERN_ERR, "error loading journal");
3180 jbd2_journal_destroy(journal);
3181 return err;
3182 }
3183
3184 EXT4_SB(sb)->s_journal = journal;
3185 ext4_clear_journal_err(sb, es);
3186
3187 if (journal_devnum &&
3188 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3189 es->s_journal_dev = cpu_to_le32(journal_devnum);
3190
3191 /* Make sure we flush the recovery flag to disk. */
3192 ext4_commit_super(sb, 1);
3193 }
3194
3195 return 0;
3196 }
3197
3198 static int ext4_commit_super(struct super_block *sb, int sync)
3199 {
3200 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3201 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3202 int error = 0;
3203
3204 if (!sbh)
3205 return error;
3206 if (buffer_write_io_error(sbh)) {
3207 /*
3208 * Oh, dear. A previous attempt to write the
3209 * superblock failed. This could happen because the
3210 * USB device was yanked out. Or it could happen to
3211 * be a transient write error and maybe the block will
3212 * be remapped. Nothing we can do but to retry the
3213 * write and hope for the best.
3214 */
3215 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3216 "superblock detected");
3217 clear_buffer_write_io_error(sbh);
3218 set_buffer_uptodate(sbh);
3219 }
3220 es->s_wtime = cpu_to_le32(get_seconds());
3221 es->s_kbytes_written =
3222 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3223 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3224 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3225 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3226 &EXT4_SB(sb)->s_freeblocks_counter));
3227 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3228 &EXT4_SB(sb)->s_freeinodes_counter));
3229 sb->s_dirt = 0;
3230 BUFFER_TRACE(sbh, "marking dirty");
3231 mark_buffer_dirty(sbh);
3232 if (sync) {
3233 error = sync_dirty_buffer(sbh);
3234 if (error)
3235 return error;
3236
3237 error = buffer_write_io_error(sbh);
3238 if (error) {
3239 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3240 "superblock");
3241 clear_buffer_write_io_error(sbh);
3242 set_buffer_uptodate(sbh);
3243 }
3244 }
3245 return error;
3246 }
3247
3248 /*
3249 * Have we just finished recovery? If so, and if we are mounting (or
3250 * remounting) the filesystem readonly, then we will end up with a
3251 * consistent fs on disk. Record that fact.
3252 */
3253 static void ext4_mark_recovery_complete(struct super_block *sb,
3254 struct ext4_super_block *es)
3255 {
3256 journal_t *journal = EXT4_SB(sb)->s_journal;
3257
3258 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3259 BUG_ON(journal != NULL);
3260 return;
3261 }
3262 jbd2_journal_lock_updates(journal);
3263 if (jbd2_journal_flush(journal) < 0)
3264 goto out;
3265
3266 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
3267 sb->s_flags & MS_RDONLY) {
3268 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3269 ext4_commit_super(sb, 1);
3270 }
3271
3272 out:
3273 jbd2_journal_unlock_updates(journal);
3274 }
3275
3276 /*
3277 * If we are mounting (or read-write remounting) a filesystem whose journal
3278 * has recorded an error from a previous lifetime, move that error to the
3279 * main filesystem now.
3280 */
3281 static void ext4_clear_journal_err(struct super_block *sb,
3282 struct ext4_super_block *es)
3283 {
3284 journal_t *journal;
3285 int j_errno;
3286 const char *errstr;
3287
3288 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3289
3290 journal = EXT4_SB(sb)->s_journal;
3291
3292 /*
3293 * Now check for any error status which may have been recorded in the
3294 * journal by a prior ext4_error() or ext4_abort()
3295 */
3296
3297 j_errno = jbd2_journal_errno(journal);
3298 if (j_errno) {
3299 char nbuf[16];
3300
3301 errstr = ext4_decode_error(sb, j_errno, nbuf);
3302 ext4_warning(sb, __func__, "Filesystem error recorded "
3303 "from previous mount: %s", errstr);
3304 ext4_warning(sb, __func__, "Marking fs in need of "
3305 "filesystem check.");
3306
3307 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3308 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
3309 ext4_commit_super(sb, 1);
3310
3311 jbd2_journal_clear_err(journal);
3312 }
3313 }
3314
3315 /*
3316 * Force the running and committing transactions to commit,
3317 * and wait on the commit.
3318 */
3319 int ext4_force_commit(struct super_block *sb)
3320 {
3321 journal_t *journal;
3322 int ret = 0;
3323
3324 if (sb->s_flags & MS_RDONLY)
3325 return 0;
3326
3327 journal = EXT4_SB(sb)->s_journal;
3328 if (journal)
3329 ret = ext4_journal_force_commit(journal);
3330
3331 return ret;
3332 }
3333
3334 static void ext4_write_super(struct super_block *sb)
3335 {
3336 ext4_commit_super(sb, 1);
3337 }
3338
3339 static int ext4_sync_fs(struct super_block *sb, int wait)
3340 {
3341 int ret = 0;
3342 tid_t target;
3343
3344 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
3345 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
3346 if (wait)
3347 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
3348 }
3349 return ret;
3350 }
3351
3352 /*
3353 * LVM calls this function before a (read-only) snapshot is created. This
3354 * gives us a chance to flush the journal completely and mark the fs clean.
3355 */
3356 static int ext4_freeze(struct super_block *sb)
3357 {
3358 int error = 0;
3359 journal_t *journal;
3360
3361 if (sb->s_flags & MS_RDONLY)
3362 return 0;
3363
3364 journal = EXT4_SB(sb)->s_journal;
3365
3366 /* Now we set up the journal barrier. */
3367 jbd2_journal_lock_updates(journal);
3368
3369 /*
3370 * Don't clear the needs_recovery flag if we failed to flush
3371 * the journal.
3372 */
3373 error = jbd2_journal_flush(journal);
3374 if (error < 0) {
3375 out:
3376 jbd2_journal_unlock_updates(journal);
3377 return error;
3378 }
3379
3380 /* Journal blocked and flushed, clear needs_recovery flag. */
3381 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3382 error = ext4_commit_super(sb, 1);
3383 if (error)
3384 goto out;
3385 return 0;
3386 }
3387
3388 /*
3389 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3390 * flag here, even though the filesystem is not technically dirty yet.
3391 */
3392 static int ext4_unfreeze(struct super_block *sb)
3393 {
3394 if (sb->s_flags & MS_RDONLY)
3395 return 0;
3396
3397 lock_super(sb);
3398 /* Reset the needs_recovery flag before the fs is unlocked. */
3399 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3400 ext4_commit_super(sb, 1);
3401 unlock_super(sb);
3402 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3403 return 0;
3404 }
3405
3406 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3407 {
3408 struct ext4_super_block *es;
3409 struct ext4_sb_info *sbi = EXT4_SB(sb);
3410 ext4_fsblk_t n_blocks_count = 0;
3411 unsigned long old_sb_flags;
3412 struct ext4_mount_options old_opts;
3413 ext4_group_t g;
3414 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3415 int err;
3416 #ifdef CONFIG_QUOTA
3417 int i;
3418 #endif
3419
3420 /* Store the original options */
3421 old_sb_flags = sb->s_flags;
3422 old_opts.s_mount_opt = sbi->s_mount_opt;
3423 old_opts.s_resuid = sbi->s_resuid;
3424 old_opts.s_resgid = sbi->s_resgid;
3425 old_opts.s_commit_interval = sbi->s_commit_interval;
3426 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3427 old_opts.s_max_batch_time = sbi->s_max_batch_time;
3428 #ifdef CONFIG_QUOTA
3429 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3430 for (i = 0; i < MAXQUOTAS; i++)
3431 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3432 #endif
3433 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3434 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
3435
3436 /*
3437 * Allow the "check" option to be passed as a remount option.
3438 */
3439 if (!parse_options(data, sb, NULL, &journal_ioprio,
3440 &n_blocks_count, 1)) {
3441 err = -EINVAL;
3442 goto restore_opts;
3443 }
3444
3445 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
3446 ext4_abort(sb, __func__, "Abort forced by user");
3447
3448 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3449 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
3450
3451 es = sbi->s_es;
3452
3453 if (sbi->s_journal) {
3454 ext4_init_journal_params(sb, sbi->s_journal);
3455 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3456 }
3457
3458 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3459 n_blocks_count > ext4_blocks_count(es)) {
3460 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
3461 err = -EROFS;
3462 goto restore_opts;
3463 }
3464
3465 if (*flags & MS_RDONLY) {
3466 /*
3467 * First of all, the unconditional stuff we have to do
3468 * to disable replay of the journal when we next remount
3469 */
3470 sb->s_flags |= MS_RDONLY;
3471
3472 /*
3473 * OK, test if we are remounting a valid rw partition
3474 * readonly, and if so set the rdonly flag and then
3475 * mark the partition as valid again.
3476 */
3477 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3478 (sbi->s_mount_state & EXT4_VALID_FS))
3479 es->s_state = cpu_to_le16(sbi->s_mount_state);
3480
3481 if (sbi->s_journal)
3482 ext4_mark_recovery_complete(sb, es);
3483 } else {
3484 int ret;
3485 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3486 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3487 ext4_msg(sb, KERN_WARNING, "couldn't "
3488 "remount RDWR because of unsupported "
3489 "optional features (%x)",
3490 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
3491 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3492 err = -EROFS;
3493 goto restore_opts;
3494 }
3495
3496 /*
3497 * Make sure the group descriptor checksums
3498 * are sane. If they aren't, refuse to remount r/w.
3499 */
3500 for (g = 0; g < sbi->s_groups_count; g++) {
3501 struct ext4_group_desc *gdp =
3502 ext4_get_group_desc(sb, g, NULL);
3503
3504 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3505 ext4_msg(sb, KERN_ERR,
3506 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3507 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3508 le16_to_cpu(gdp->bg_checksum));
3509 err = -EINVAL;
3510 goto restore_opts;
3511 }
3512 }
3513
3514 /*
3515 * If we have an unprocessed orphan list hanging
3516 * around from a previously readonly bdev mount,
3517 * require a full umount/remount for now.
3518 */
3519 if (es->s_last_orphan) {
3520 ext4_msg(sb, KERN_WARNING, "Couldn't "
3521 "remount RDWR because of unprocessed "
3522 "orphan inode list. Please "
3523 "umount/remount instead");
3524 err = -EINVAL;
3525 goto restore_opts;
3526 }
3527
3528 /*
3529 * Mounting a RDONLY partition read-write, so reread
3530 * and store the current valid flag. (It may have
3531 * been changed by e2fsck since we originally mounted
3532 * the partition.)
3533 */
3534 if (sbi->s_journal)
3535 ext4_clear_journal_err(sb, es);
3536 sbi->s_mount_state = le16_to_cpu(es->s_state);
3537 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3538 goto restore_opts;
3539 if (!ext4_setup_super(sb, es, 0))
3540 sb->s_flags &= ~MS_RDONLY;
3541 }
3542 }
3543 ext4_setup_system_zone(sb);
3544 if (sbi->s_journal == NULL)
3545 ext4_commit_super(sb, 1);
3546
3547 #ifdef CONFIG_QUOTA
3548 /* Release old quota file names */
3549 for (i = 0; i < MAXQUOTAS; i++)
3550 if (old_opts.s_qf_names[i] &&
3551 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3552 kfree(old_opts.s_qf_names[i]);
3553 #endif
3554 return 0;
3555
3556 restore_opts:
3557 sb->s_flags = old_sb_flags;
3558 sbi->s_mount_opt = old_opts.s_mount_opt;
3559 sbi->s_resuid = old_opts.s_resuid;
3560 sbi->s_resgid = old_opts.s_resgid;
3561 sbi->s_commit_interval = old_opts.s_commit_interval;
3562 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3563 sbi->s_max_batch_time = old_opts.s_max_batch_time;
3564 #ifdef CONFIG_QUOTA
3565 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3566 for (i = 0; i < MAXQUOTAS; i++) {
3567 if (sbi->s_qf_names[i] &&
3568 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3569 kfree(sbi->s_qf_names[i]);
3570 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3571 }
3572 #endif
3573 return err;
3574 }
3575
3576 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3577 {
3578 struct super_block *sb = dentry->d_sb;
3579 struct ext4_sb_info *sbi = EXT4_SB(sb);
3580 struct ext4_super_block *es = sbi->s_es;
3581 u64 fsid;
3582
3583 if (test_opt(sb, MINIX_DF)) {
3584 sbi->s_overhead_last = 0;
3585 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3586 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3587 ext4_fsblk_t overhead = 0;
3588
3589 /*
3590 * Compute the overhead (FS structures). This is constant
3591 * for a given filesystem unless the number of block groups
3592 * changes so we cache the previous value until it does.
3593 */
3594
3595 /*
3596 * All of the blocks before first_data_block are
3597 * overhead
3598 */
3599 overhead = le32_to_cpu(es->s_first_data_block);
3600
3601 /*
3602 * Add the overhead attributed to the superblock and
3603 * block group descriptors. If the sparse superblocks
3604 * feature is turned on, then not all groups have this.
3605 */
3606 for (i = 0; i < ngroups; i++) {
3607 overhead += ext4_bg_has_super(sb, i) +
3608 ext4_bg_num_gdb(sb, i);
3609 cond_resched();
3610 }
3611
3612 /*
3613 * Every block group has an inode bitmap, a block
3614 * bitmap, and an inode table.
3615 */
3616 overhead += ngroups * (2 + sbi->s_itb_per_group);
3617 sbi->s_overhead_last = overhead;
3618 smp_wmb();
3619 sbi->s_blocks_last = ext4_blocks_count(es);
3620 }
3621
3622 buf->f_type = EXT4_SUPER_MAGIC;
3623 buf->f_bsize = sb->s_blocksize;
3624 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3625 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3626 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3627 ext4_free_blocks_count_set(es, buf->f_bfree);
3628 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3629 if (buf->f_bfree < ext4_r_blocks_count(es))
3630 buf->f_bavail = 0;
3631 buf->f_files = le32_to_cpu(es->s_inodes_count);
3632 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3633 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3634 buf->f_namelen = EXT4_NAME_LEN;
3635 fsid = le64_to_cpup((void *)es->s_uuid) ^
3636 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3637 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3638 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3639
3640 return 0;
3641 }
3642
3643 /* Helper function for writing quotas on sync - we need to start transaction
3644 * before quota file is locked for write. Otherwise the are possible deadlocks:
3645 * Process 1 Process 2
3646 * ext4_create() quota_sync()
3647 * jbd2_journal_start() write_dquot()
3648 * vfs_dq_init() down(dqio_mutex)
3649 * down(dqio_mutex) jbd2_journal_start()
3650 *
3651 */
3652
3653 #ifdef CONFIG_QUOTA
3654
3655 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3656 {
3657 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3658 }
3659
3660 static int ext4_write_dquot(struct dquot *dquot)
3661 {
3662 int ret, err;
3663 handle_t *handle;
3664 struct inode *inode;
3665
3666 inode = dquot_to_inode(dquot);
3667 handle = ext4_journal_start(inode,
3668 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3669 if (IS_ERR(handle))
3670 return PTR_ERR(handle);
3671 ret = dquot_commit(dquot);
3672 err = ext4_journal_stop(handle);
3673 if (!ret)
3674 ret = err;
3675 return ret;
3676 }
3677
3678 static int ext4_acquire_dquot(struct dquot *dquot)
3679 {
3680 int ret, err;
3681 handle_t *handle;
3682
3683 handle = ext4_journal_start(dquot_to_inode(dquot),
3684 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3685 if (IS_ERR(handle))
3686 return PTR_ERR(handle);
3687 ret = dquot_acquire(dquot);
3688 err = ext4_journal_stop(handle);
3689 if (!ret)
3690 ret = err;
3691 return ret;
3692 }
3693
3694 static int ext4_release_dquot(struct dquot *dquot)
3695 {
3696 int ret, err;
3697 handle_t *handle;
3698
3699 handle = ext4_journal_start(dquot_to_inode(dquot),
3700 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3701 if (IS_ERR(handle)) {
3702 /* Release dquot anyway to avoid endless cycle in dqput() */
3703 dquot_release(dquot);
3704 return PTR_ERR(handle);
3705 }
3706 ret = dquot_release(dquot);
3707 err = ext4_journal_stop(handle);
3708 if (!ret)
3709 ret = err;
3710 return ret;
3711 }
3712
3713 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3714 {
3715 /* Are we journaling quotas? */
3716 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3717 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3718 dquot_mark_dquot_dirty(dquot);
3719 return ext4_write_dquot(dquot);
3720 } else {
3721 return dquot_mark_dquot_dirty(dquot);
3722 }
3723 }
3724
3725 static int ext4_write_info(struct super_block *sb, int type)
3726 {
3727 int ret, err;
3728 handle_t *handle;
3729
3730 /* Data block + inode block */
3731 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3732 if (IS_ERR(handle))
3733 return PTR_ERR(handle);
3734 ret = dquot_commit_info(sb, type);
3735 err = ext4_journal_stop(handle);
3736 if (!ret)
3737 ret = err;
3738 return ret;
3739 }
3740
3741 /*
3742 * Turn on quotas during mount time - we need to find
3743 * the quota file and such...
3744 */
3745 static int ext4_quota_on_mount(struct super_block *sb, int type)
3746 {
3747 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3748 EXT4_SB(sb)->s_jquota_fmt, type);
3749 }
3750
3751 /*
3752 * Standard function to be called on quota_on
3753 */
3754 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3755 char *name, int remount)
3756 {
3757 int err;
3758 struct path path;
3759
3760 if (!test_opt(sb, QUOTA))
3761 return -EINVAL;
3762 /* When remounting, no checks are needed and in fact, name is NULL */
3763 if (remount)
3764 return vfs_quota_on(sb, type, format_id, name, remount);
3765
3766 err = kern_path(name, LOOKUP_FOLLOW, &path);
3767 if (err)
3768 return err;
3769
3770 /* Quotafile not on the same filesystem? */
3771 if (path.mnt->mnt_sb != sb) {
3772 path_put(&path);
3773 return -EXDEV;
3774 }
3775 /* Journaling quota? */
3776 if (EXT4_SB(sb)->s_qf_names[type]) {
3777 /* Quotafile not in fs root? */
3778 if (path.dentry->d_parent != sb->s_root)
3779 ext4_msg(sb, KERN_WARNING,
3780 "Quota file not on filesystem root. "
3781 "Journaled quota will not work");
3782 }
3783
3784 /*
3785 * When we journal data on quota file, we have to flush journal to see
3786 * all updates to the file when we bypass pagecache...
3787 */
3788 if (EXT4_SB(sb)->s_journal &&
3789 ext4_should_journal_data(path.dentry->d_inode)) {
3790 /*
3791 * We don't need to lock updates but journal_flush() could
3792 * otherwise be livelocked...
3793 */
3794 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3795 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3796 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3797 if (err) {
3798 path_put(&path);
3799 return err;
3800 }
3801 }
3802
3803 err = vfs_quota_on_path(sb, type, format_id, &path);
3804 path_put(&path);
3805 return err;
3806 }
3807
3808 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3809 * acquiring the locks... As quota files are never truncated and quota code
3810 * itself serializes the operations (and noone else should touch the files)
3811 * we don't have to be afraid of races */
3812 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3813 size_t len, loff_t off)
3814 {
3815 struct inode *inode = sb_dqopt(sb)->files[type];
3816 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3817 int err = 0;
3818 int offset = off & (sb->s_blocksize - 1);
3819 int tocopy;
3820 size_t toread;
3821 struct buffer_head *bh;
3822 loff_t i_size = i_size_read(inode);
3823
3824 if (off > i_size)
3825 return 0;
3826 if (off+len > i_size)
3827 len = i_size-off;
3828 toread = len;
3829 while (toread > 0) {
3830 tocopy = sb->s_blocksize - offset < toread ?
3831 sb->s_blocksize - offset : toread;
3832 bh = ext4_bread(NULL, inode, blk, 0, &err);
3833 if (err)
3834 return err;
3835 if (!bh) /* A hole? */
3836 memset(data, 0, tocopy);
3837 else
3838 memcpy(data, bh->b_data+offset, tocopy);
3839 brelse(bh);
3840 offset = 0;
3841 toread -= tocopy;
3842 data += tocopy;
3843 blk++;
3844 }
3845 return len;
3846 }
3847
3848 /* Write to quotafile (we know the transaction is already started and has
3849 * enough credits) */
3850 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3851 const char *data, size_t len, loff_t off)
3852 {
3853 struct inode *inode = sb_dqopt(sb)->files[type];
3854 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3855 int err = 0;
3856 int offset = off & (sb->s_blocksize - 1);
3857 int tocopy;
3858 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3859 size_t towrite = len;
3860 struct buffer_head *bh;
3861 handle_t *handle = journal_current_handle();
3862
3863 if (EXT4_SB(sb)->s_journal && !handle) {
3864 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3865 " cancelled because transaction is not started",
3866 (unsigned long long)off, (unsigned long long)len);
3867 return -EIO;
3868 }
3869 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3870 while (towrite > 0) {
3871 tocopy = sb->s_blocksize - offset < towrite ?
3872 sb->s_blocksize - offset : towrite;
3873 bh = ext4_bread(handle, inode, blk, 1, &err);
3874 if (!bh)
3875 goto out;
3876 if (journal_quota) {
3877 err = ext4_journal_get_write_access(handle, bh);
3878 if (err) {
3879 brelse(bh);
3880 goto out;
3881 }
3882 }
3883 lock_buffer(bh);
3884 memcpy(bh->b_data+offset, data, tocopy);
3885 flush_dcache_page(bh->b_page);
3886 unlock_buffer(bh);
3887 if (journal_quota)
3888 err = ext4_handle_dirty_metadata(handle, NULL, bh);
3889 else {
3890 /* Always do at least ordered writes for quotas */
3891 err = ext4_jbd2_file_inode(handle, inode);
3892 mark_buffer_dirty(bh);
3893 }
3894 brelse(bh);
3895 if (err)
3896 goto out;
3897 offset = 0;
3898 towrite -= tocopy;
3899 data += tocopy;
3900 blk++;
3901 }
3902 out:
3903 if (len == towrite) {
3904 mutex_unlock(&inode->i_mutex);
3905 return err;
3906 }
3907 if (inode->i_size < off+len-towrite) {
3908 i_size_write(inode, off+len-towrite);
3909 EXT4_I(inode)->i_disksize = inode->i_size;
3910 }
3911 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3912 ext4_mark_inode_dirty(handle, inode);
3913 mutex_unlock(&inode->i_mutex);
3914 return len - towrite;
3915 }
3916
3917 #endif
3918
3919 static int ext4_get_sb(struct file_system_type *fs_type, int flags,
3920 const char *dev_name, void *data, struct vfsmount *mnt)
3921 {
3922 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
3923 }
3924
3925 static struct file_system_type ext4_fs_type = {
3926 .owner = THIS_MODULE,
3927 .name = "ext4",
3928 .get_sb = ext4_get_sb,
3929 .kill_sb = kill_block_super,
3930 .fs_flags = FS_REQUIRES_DEV,
3931 };
3932
3933 #ifdef CONFIG_EXT4DEV_COMPAT
3934 static int ext4dev_get_sb(struct file_system_type *fs_type, int flags,
3935 const char *dev_name, void *data,struct vfsmount *mnt)
3936 {
3937 printk(KERN_WARNING "EXT4-fs (%s): Update your userspace programs "
3938 "to mount using ext4\n", dev_name);
3939 printk(KERN_WARNING "EXT4-fs (%s): ext4dev backwards compatibility "
3940 "will go away by 2.6.31\n", dev_name);
3941 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
3942 }
3943
3944 static struct file_system_type ext4dev_fs_type = {
3945 .owner = THIS_MODULE,
3946 .name = "ext4dev",
3947 .get_sb = ext4dev_get_sb,
3948 .kill_sb = kill_block_super,
3949 .fs_flags = FS_REQUIRES_DEV,
3950 };
3951 MODULE_ALIAS("ext4dev");
3952 #endif
3953
3954 static int __init init_ext4_fs(void)
3955 {
3956 int err;
3957
3958 err = init_ext4_system_zone();
3959 if (err)
3960 return err;
3961 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
3962 if (!ext4_kset)
3963 goto out4;
3964 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
3965 err = init_ext4_mballoc();
3966 if (err)
3967 goto out3;
3968
3969 err = init_ext4_xattr();
3970 if (err)
3971 goto out2;
3972 err = init_inodecache();
3973 if (err)
3974 goto out1;
3975 err = register_filesystem(&ext4_fs_type);
3976 if (err)
3977 goto out;
3978 #ifdef CONFIG_EXT4DEV_COMPAT
3979 err = register_filesystem(&ext4dev_fs_type);
3980 if (err) {
3981 unregister_filesystem(&ext4_fs_type);
3982 goto out;
3983 }
3984 #endif
3985 return 0;
3986 out:
3987 destroy_inodecache();
3988 out1:
3989 exit_ext4_xattr();
3990 out2:
3991 exit_ext4_mballoc();
3992 out3:
3993 remove_proc_entry("fs/ext4", NULL);
3994 kset_unregister(ext4_kset);
3995 out4:
3996 exit_ext4_system_zone();
3997 return err;
3998 }
3999
4000 static void __exit exit_ext4_fs(void)
4001 {
4002 unregister_filesystem(&ext4_fs_type);
4003 #ifdef CONFIG_EXT4DEV_COMPAT
4004 unregister_filesystem(&ext4dev_fs_type);
4005 #endif
4006 destroy_inodecache();
4007 exit_ext4_xattr();
4008 exit_ext4_mballoc();
4009 remove_proc_entry("fs/ext4", NULL);
4010 kset_unregister(ext4_kset);
4011 exit_ext4_system_zone();
4012 }
4013
4014 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4015 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4016 MODULE_LICENSE("GPL");
4017 module_init(init_ext4_fs)
4018 module_exit(exit_ext4_fs)
Linux kernel - Deliverables
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