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Staging: Merge 2.6.37-rc5 into staging-next
[wandboard.git] / fs / ext4 / super.c
blobe32195d6aac34656b13a5619c3750e8b30586c08
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/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <asm/uaccess.h>
42
43 #include <linux/kthread.h>
44 #include <linux/freezer.h>
45
46 #include "ext4.h"
47 #include "ext4_jbd2.h"
48 #include "xattr.h"
49 #include "acl.h"
50 #include "mballoc.h"
51
52 #define CREATE_TRACE_POINTS
53 #include <trace/events/ext4.h>
54
55 static struct proc_dir_entry *ext4_proc_root;
56 static struct kset *ext4_kset;
57 struct ext4_lazy_init *ext4_li_info;
58 struct mutex ext4_li_mtx;
59 struct ext4_features *ext4_feat;
60
61 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
62 unsigned long journal_devnum);
63 static int ext4_commit_super(struct super_block *sb, int sync);
64 static void ext4_mark_recovery_complete(struct super_block *sb,
65 struct ext4_super_block *es);
66 static void ext4_clear_journal_err(struct super_block *sb,
67 struct ext4_super_block *es);
68 static int ext4_sync_fs(struct super_block *sb, int wait);
69 static const char *ext4_decode_error(struct super_block *sb, int errno,
70 char nbuf[16]);
71 static int ext4_remount(struct super_block *sb, int *flags, char *data);
72 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
73 static int ext4_unfreeze(struct super_block *sb);
74 static void ext4_write_super(struct super_block *sb);
75 static int ext4_freeze(struct super_block *sb);
76 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
78 static void ext4_destroy_lazyinit_thread(void);
79 static void ext4_unregister_li_request(struct super_block *sb);
80
81 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
82 static struct file_system_type ext3_fs_type = {
83 .owner = THIS_MODULE,
84 .name = "ext3",
85 .mount = ext4_mount,
86 .kill_sb = kill_block_super,
87 .fs_flags = FS_REQUIRES_DEV,
88 };
89 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
90 #else
91 #define IS_EXT3_SB(sb) (0)
92 #endif
93
94 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
95 struct ext4_group_desc *bg)
96 {
97 return le32_to_cpu(bg->bg_block_bitmap_lo) |
98 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
99 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
100 }
101
102 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
103 struct ext4_group_desc *bg)
104 {
105 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
106 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
107 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
108 }
109
110 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
111 struct ext4_group_desc *bg)
112 {
113 return le32_to_cpu(bg->bg_inode_table_lo) |
114 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
115 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
116 }
117
118 __u32 ext4_free_blks_count(struct super_block *sb,
119 struct ext4_group_desc *bg)
120 {
121 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
122 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
123 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
124 }
125
126 __u32 ext4_free_inodes_count(struct super_block *sb,
127 struct ext4_group_desc *bg)
128 {
129 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
130 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
131 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
132 }
133
134 __u32 ext4_used_dirs_count(struct super_block *sb,
135 struct ext4_group_desc *bg)
136 {
137 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
138 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
139 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
140 }
141
142 __u32 ext4_itable_unused_count(struct super_block *sb,
143 struct ext4_group_desc *bg)
144 {
145 return le16_to_cpu(bg->bg_itable_unused_lo) |
146 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
147 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
148 }
149
150 void ext4_block_bitmap_set(struct super_block *sb,
151 struct ext4_group_desc *bg, ext4_fsblk_t blk)
152 {
153 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
154 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
155 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
156 }
157
158 void ext4_inode_bitmap_set(struct super_block *sb,
159 struct ext4_group_desc *bg, ext4_fsblk_t blk)
160 {
161 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
162 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
163 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
164 }
165
166 void ext4_inode_table_set(struct super_block *sb,
167 struct ext4_group_desc *bg, ext4_fsblk_t blk)
168 {
169 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
170 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
171 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
172 }
173
174 void ext4_free_blks_set(struct super_block *sb,
175 struct ext4_group_desc *bg, __u32 count)
176 {
177 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
178 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
179 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
180 }
181
182 void ext4_free_inodes_set(struct super_block *sb,
183 struct ext4_group_desc *bg, __u32 count)
184 {
185 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
186 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
187 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
188 }
189
190 void ext4_used_dirs_set(struct super_block *sb,
191 struct ext4_group_desc *bg, __u32 count)
192 {
193 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
194 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
195 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
196 }
197
198 void ext4_itable_unused_set(struct super_block *sb,
199 struct ext4_group_desc *bg, __u32 count)
200 {
201 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
202 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
203 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
204 }
205
206
207 /* Just increment the non-pointer handle value */
208 static handle_t *ext4_get_nojournal(void)
209 {
210 handle_t *handle = current->journal_info;
211 unsigned long ref_cnt = (unsigned long)handle;
212
213 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
214
215 ref_cnt++;
216 handle = (handle_t *)ref_cnt;
217
218 current->journal_info = handle;
219 return handle;
220 }
221
222
223 /* Decrement the non-pointer handle value */
224 static void ext4_put_nojournal(handle_t *handle)
225 {
226 unsigned long ref_cnt = (unsigned long)handle;
227
228 BUG_ON(ref_cnt == 0);
229
230 ref_cnt--;
231 handle = (handle_t *)ref_cnt;
232
233 current->journal_info = handle;
234 }
235
236 /*
237 * Wrappers for jbd2_journal_start/end.
238 *
239 * The only special thing we need to do here is to make sure that all
240 * journal_end calls result in the superblock being marked dirty, so
241 * that sync() will call the filesystem's write_super callback if
242 * appropriate.
243 */
244 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
245 {
246 journal_t *journal;
247
248 if (sb->s_flags & MS_RDONLY)
249 return ERR_PTR(-EROFS);
250
251 vfs_check_frozen(sb, SB_FREEZE_TRANS);
252 /* Special case here: if the journal has aborted behind our
253 * backs (eg. EIO in the commit thread), then we still need to
254 * take the FS itself readonly cleanly. */
255 journal = EXT4_SB(sb)->s_journal;
256 if (journal) {
257 if (is_journal_aborted(journal)) {
258 ext4_abort(sb, "Detected aborted journal");
259 return ERR_PTR(-EROFS);
260 }
261 return jbd2_journal_start(journal, nblocks);
262 }
263 return ext4_get_nojournal();
264 }
265
266 /*
267 * The only special thing we need to do here is to make sure that all
268 * jbd2_journal_stop calls result in the superblock being marked dirty, so
269 * that sync() will call the filesystem's write_super callback if
270 * appropriate.
271 */
272 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
273 {
274 struct super_block *sb;
275 int err;
276 int rc;
277
278 if (!ext4_handle_valid(handle)) {
279 ext4_put_nojournal(handle);
280 return 0;
281 }
282 sb = handle->h_transaction->t_journal->j_private;
283 err = handle->h_err;
284 rc = jbd2_journal_stop(handle);
285
286 if (!err)
287 err = rc;
288 if (err)
289 __ext4_std_error(sb, where, line, err);
290 return err;
291 }
292
293 void ext4_journal_abort_handle(const char *caller, unsigned int line,
294 const char *err_fn, struct buffer_head *bh,
295 handle_t *handle, int err)
296 {
297 char nbuf[16];
298 const char *errstr = ext4_decode_error(NULL, err, nbuf);
299
300 BUG_ON(!ext4_handle_valid(handle));
301
302 if (bh)
303 BUFFER_TRACE(bh, "abort");
304
305 if (!handle->h_err)
306 handle->h_err = err;
307
308 if (is_handle_aborted(handle))
309 return;
310
311 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
312 caller, line, errstr, err_fn);
313
314 jbd2_journal_abort_handle(handle);
315 }
316
317 static void __save_error_info(struct super_block *sb, const char *func,
318 unsigned int line)
319 {
320 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
321
322 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
323 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
324 es->s_last_error_time = cpu_to_le32(get_seconds());
325 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
326 es->s_last_error_line = cpu_to_le32(line);
327 if (!es->s_first_error_time) {
328 es->s_first_error_time = es->s_last_error_time;
329 strncpy(es->s_first_error_func, func,
330 sizeof(es->s_first_error_func));
331 es->s_first_error_line = cpu_to_le32(line);
332 es->s_first_error_ino = es->s_last_error_ino;
333 es->s_first_error_block = es->s_last_error_block;
334 }
335 /*
336 * Start the daily error reporting function if it hasn't been
337 * started already
338 */
339 if (!es->s_error_count)
340 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
341 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
342 }
343
344 static void save_error_info(struct super_block *sb, const char *func,
345 unsigned int line)
346 {
347 __save_error_info(sb, func, line);
348 ext4_commit_super(sb, 1);
349 }
350
351
352 /* Deal with the reporting of failure conditions on a filesystem such as
353 * inconsistencies detected or read IO failures.
354 *
355 * On ext2, we can store the error state of the filesystem in the
356 * superblock. That is not possible on ext4, because we may have other
357 * write ordering constraints on the superblock which prevent us from
358 * writing it out straight away; and given that the journal is about to
359 * be aborted, we can't rely on the current, or future, transactions to
360 * write out the superblock safely.
361 *
362 * We'll just use the jbd2_journal_abort() error code to record an error in
363 * the journal instead. On recovery, the journal will complain about
364 * that error until we've noted it down and cleared it.
365 */
366
367 static void ext4_handle_error(struct super_block *sb)
368 {
369 if (sb->s_flags & MS_RDONLY)
370 return;
371
372 if (!test_opt(sb, ERRORS_CONT)) {
373 journal_t *journal = EXT4_SB(sb)->s_journal;
374
375 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
376 if (journal)
377 jbd2_journal_abort(journal, -EIO);
378 }
379 if (test_opt(sb, ERRORS_RO)) {
380 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
381 sb->s_flags |= MS_RDONLY;
382 }
383 if (test_opt(sb, ERRORS_PANIC))
384 panic("EXT4-fs (device %s): panic forced after error\n",
385 sb->s_id);
386 }
387
388 void __ext4_error(struct super_block *sb, const char *function,
389 unsigned int line, const char *fmt, ...)
390 {
391 va_list args;
392
393 va_start(args, fmt);
394 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: ",
395 sb->s_id, function, line, current->comm);
396 vprintk(fmt, args);
397 printk("\n");
398 va_end(args);
399
400 ext4_handle_error(sb);
401 }
402
403 void ext4_error_inode(struct inode *inode, const char *function,
404 unsigned int line, ext4_fsblk_t block,
405 const char *fmt, ...)
406 {
407 va_list args;
408 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
409
410 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
411 es->s_last_error_block = cpu_to_le64(block);
412 save_error_info(inode->i_sb, function, line);
413 va_start(args, fmt);
414 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
415 inode->i_sb->s_id, function, line, inode->i_ino);
416 if (block)
417 printk("block %llu: ", block);
418 printk("comm %s: ", current->comm);
419 vprintk(fmt, args);
420 printk("\n");
421 va_end(args);
422
423 ext4_handle_error(inode->i_sb);
424 }
425
426 void ext4_error_file(struct file *file, const char *function,
427 unsigned int line, const char *fmt, ...)
428 {
429 va_list args;
430 struct ext4_super_block *es;
431 struct inode *inode = file->f_dentry->d_inode;
432 char pathname[80], *path;
433
434 es = EXT4_SB(inode->i_sb)->s_es;
435 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
436 save_error_info(inode->i_sb, function, line);
437 va_start(args, fmt);
438 path = d_path(&(file->f_path), pathname, sizeof(pathname));
439 if (!path)
440 path = "(unknown)";
441 printk(KERN_CRIT
442 "EXT4-fs error (device %s): %s:%d: inode #%lu "
443 "(comm %s path %s): ",
444 inode->i_sb->s_id, function, line, inode->i_ino,
445 current->comm, path);
446 vprintk(fmt, args);
447 printk("\n");
448 va_end(args);
449
450 ext4_handle_error(inode->i_sb);
451 }
452
453 static const char *ext4_decode_error(struct super_block *sb, int errno,
454 char nbuf[16])
455 {
456 char *errstr = NULL;
457
458 switch (errno) {
459 case -EIO:
460 errstr = "IO failure";
461 break;
462 case -ENOMEM:
463 errstr = "Out of memory";
464 break;
465 case -EROFS:
466 if (!sb || (EXT4_SB(sb)->s_journal &&
467 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
468 errstr = "Journal has aborted";
469 else
470 errstr = "Readonly filesystem";
471 break;
472 default:
473 /* If the caller passed in an extra buffer for unknown
474 * errors, textualise them now. Else we just return
475 * NULL. */
476 if (nbuf) {
477 /* Check for truncated error codes... */
478 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
479 errstr = nbuf;
480 }
481 break;
482 }
483
484 return errstr;
485 }
486
487 /* __ext4_std_error decodes expected errors from journaling functions
488 * automatically and invokes the appropriate error response. */
489
490 void __ext4_std_error(struct super_block *sb, const char *function,
491 unsigned int line, int errno)
492 {
493 char nbuf[16];
494 const char *errstr;
495
496 /* Special case: if the error is EROFS, and we're not already
497 * inside a transaction, then there's really no point in logging
498 * an error. */
499 if (errno == -EROFS && journal_current_handle() == NULL &&
500 (sb->s_flags & MS_RDONLY))
501 return;
502
503 errstr = ext4_decode_error(sb, errno, nbuf);
504 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
505 sb->s_id, function, line, errstr);
506 save_error_info(sb, function, line);
507
508 ext4_handle_error(sb);
509 }
510
511 /*
512 * ext4_abort is a much stronger failure handler than ext4_error. The
513 * abort function may be used to deal with unrecoverable failures such
514 * as journal IO errors or ENOMEM at a critical moment in log management.
515 *
516 * We unconditionally force the filesystem into an ABORT|READONLY state,
517 * unless the error response on the fs has been set to panic in which
518 * case we take the easy way out and panic immediately.
519 */
520
521 void __ext4_abort(struct super_block *sb, const char *function,
522 unsigned int line, const char *fmt, ...)
523 {
524 va_list args;
525
526 save_error_info(sb, function, line);
527 va_start(args, fmt);
528 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
529 function, line);
530 vprintk(fmt, args);
531 printk("\n");
532 va_end(args);
533
534 if ((sb->s_flags & MS_RDONLY) == 0) {
535 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
536 sb->s_flags |= MS_RDONLY;
537 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
538 if (EXT4_SB(sb)->s_journal)
539 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
540 save_error_info(sb, function, line);
541 }
542 if (test_opt(sb, ERRORS_PANIC))
543 panic("EXT4-fs panic from previous error\n");
544 }
545
546 void ext4_msg (struct super_block * sb, const char *prefix,
547 const char *fmt, ...)
548 {
549 va_list args;
550
551 va_start(args, fmt);
552 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
553 vprintk(fmt, args);
554 printk("\n");
555 va_end(args);
556 }
557
558 void __ext4_warning(struct super_block *sb, const char *function,
559 unsigned int line, const char *fmt, ...)
560 {
561 va_list args;
562
563 va_start(args, fmt);
564 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: ",
565 sb->s_id, function, line);
566 vprintk(fmt, args);
567 printk("\n");
568 va_end(args);
569 }
570
571 void __ext4_grp_locked_error(const char *function, unsigned int line,
572 struct super_block *sb, ext4_group_t grp,
573 unsigned long ino, ext4_fsblk_t block,
574 const char *fmt, ...)
575 __releases(bitlock)
576 __acquires(bitlock)
577 {
578 va_list args;
579 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
580
581 es->s_last_error_ino = cpu_to_le32(ino);
582 es->s_last_error_block = cpu_to_le64(block);
583 __save_error_info(sb, function, line);
584 va_start(args, fmt);
585 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u",
586 sb->s_id, function, line, grp);
587 if (ino)
588 printk("inode %lu: ", ino);
589 if (block)
590 printk("block %llu:", (unsigned long long) block);
591 vprintk(fmt, args);
592 printk("\n");
593 va_end(args);
594
595 if (test_opt(sb, ERRORS_CONT)) {
596 ext4_commit_super(sb, 0);
597 return;
598 }
599
600 ext4_unlock_group(sb, grp);
601 ext4_handle_error(sb);
602 /*
603 * We only get here in the ERRORS_RO case; relocking the group
604 * may be dangerous, but nothing bad will happen since the
605 * filesystem will have already been marked read/only and the
606 * journal has been aborted. We return 1 as a hint to callers
607 * who might what to use the return value from
608 * ext4_grp_locked_error() to distinguish beween the
609 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
610 * aggressively from the ext4 function in question, with a
611 * more appropriate error code.
612 */
613 ext4_lock_group(sb, grp);
614 return;
615 }
616
617 void ext4_update_dynamic_rev(struct super_block *sb)
618 {
619 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
620
621 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
622 return;
623
624 ext4_warning(sb,
625 "updating to rev %d because of new feature flag, "
626 "running e2fsck is recommended",
627 EXT4_DYNAMIC_REV);
628
629 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
630 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
631 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
632 /* leave es->s_feature_*compat flags alone */
633 /* es->s_uuid will be set by e2fsck if empty */
634
635 /*
636 * The rest of the superblock fields should be zero, and if not it
637 * means they are likely already in use, so leave them alone. We
638 * can leave it up to e2fsck to clean up any inconsistencies there.
639 */
640 }
641
642 /*
643 * Open the external journal device
644 */
645 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
646 {
647 struct block_device *bdev;
648 char b[BDEVNAME_SIZE];
649
650 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
651 if (IS_ERR(bdev))
652 goto fail;
653 return bdev;
654
655 fail:
656 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
657 __bdevname(dev, b), PTR_ERR(bdev));
658 return NULL;
659 }
660
661 /*
662 * Release the journal device
663 */
664 static int ext4_blkdev_put(struct block_device *bdev)
665 {
666 bd_release(bdev);
667 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
668 }
669
670 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
671 {
672 struct block_device *bdev;
673 int ret = -ENODEV;
674
675 bdev = sbi->journal_bdev;
676 if (bdev) {
677 ret = ext4_blkdev_put(bdev);
678 sbi->journal_bdev = NULL;
679 }
680 return ret;
681 }
682
683 static inline struct inode *orphan_list_entry(struct list_head *l)
684 {
685 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
686 }
687
688 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
689 {
690 struct list_head *l;
691
692 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
693 le32_to_cpu(sbi->s_es->s_last_orphan));
694
695 printk(KERN_ERR "sb_info orphan list:\n");
696 list_for_each(l, &sbi->s_orphan) {
697 struct inode *inode = orphan_list_entry(l);
698 printk(KERN_ERR " "
699 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
700 inode->i_sb->s_id, inode->i_ino, inode,
701 inode->i_mode, inode->i_nlink,
702 NEXT_ORPHAN(inode));
703 }
704 }
705
706 static void ext4_put_super(struct super_block *sb)
707 {
708 struct ext4_sb_info *sbi = EXT4_SB(sb);
709 struct ext4_super_block *es = sbi->s_es;
710 int i, err;
711
712 ext4_unregister_li_request(sb);
713 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
714
715 flush_workqueue(sbi->dio_unwritten_wq);
716 destroy_workqueue(sbi->dio_unwritten_wq);
717
718 lock_super(sb);
719 if (sb->s_dirt)
720 ext4_commit_super(sb, 1);
721
722 if (sbi->s_journal) {
723 err = jbd2_journal_destroy(sbi->s_journal);
724 sbi->s_journal = NULL;
725 if (err < 0)
726 ext4_abort(sb, "Couldn't clean up the journal");
727 }
728
729 del_timer(&sbi->s_err_report);
730 ext4_release_system_zone(sb);
731 ext4_mb_release(sb);
732 ext4_ext_release(sb);
733 ext4_xattr_put_super(sb);
734
735 if (!(sb->s_flags & MS_RDONLY)) {
736 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
737 es->s_state = cpu_to_le16(sbi->s_mount_state);
738 ext4_commit_super(sb, 1);
739 }
740 if (sbi->s_proc) {
741 remove_proc_entry(sb->s_id, ext4_proc_root);
742 }
743 kobject_del(&sbi->s_kobj);
744
745 for (i = 0; i < sbi->s_gdb_count; i++)
746 brelse(sbi->s_group_desc[i]);
747 kfree(sbi->s_group_desc);
748 if (is_vmalloc_addr(sbi->s_flex_groups))
749 vfree(sbi->s_flex_groups);
750 else
751 kfree(sbi->s_flex_groups);
752 percpu_counter_destroy(&sbi->s_freeblocks_counter);
753 percpu_counter_destroy(&sbi->s_freeinodes_counter);
754 percpu_counter_destroy(&sbi->s_dirs_counter);
755 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
756 brelse(sbi->s_sbh);
757 #ifdef CONFIG_QUOTA
758 for (i = 0; i < MAXQUOTAS; i++)
759 kfree(sbi->s_qf_names[i]);
760 #endif
761
762 /* Debugging code just in case the in-memory inode orphan list
763 * isn't empty. The on-disk one can be non-empty if we've
764 * detected an error and taken the fs readonly, but the
765 * in-memory list had better be clean by this point. */
766 if (!list_empty(&sbi->s_orphan))
767 dump_orphan_list(sb, sbi);
768 J_ASSERT(list_empty(&sbi->s_orphan));
769
770 invalidate_bdev(sb->s_bdev);
771 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
772 /*
773 * Invalidate the journal device's buffers. We don't want them
774 * floating about in memory - the physical journal device may
775 * hotswapped, and it breaks the `ro-after' testing code.
776 */
777 sync_blockdev(sbi->journal_bdev);
778 invalidate_bdev(sbi->journal_bdev);
779 ext4_blkdev_remove(sbi);
780 }
781 sb->s_fs_info = NULL;
782 /*
783 * Now that we are completely done shutting down the
784 * superblock, we need to actually destroy the kobject.
785 */
786 unlock_super(sb);
787 kobject_put(&sbi->s_kobj);
788 wait_for_completion(&sbi->s_kobj_unregister);
789 kfree(sbi->s_blockgroup_lock);
790 kfree(sbi);
791 }
792
793 static struct kmem_cache *ext4_inode_cachep;
794
795 /*
796 * Called inside transaction, so use GFP_NOFS
797 */
798 static struct inode *ext4_alloc_inode(struct super_block *sb)
799 {
800 struct ext4_inode_info *ei;
801
802 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
803 if (!ei)
804 return NULL;
805
806 ei->vfs_inode.i_version = 1;
807 ei->vfs_inode.i_data.writeback_index = 0;
808 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
809 INIT_LIST_HEAD(&ei->i_prealloc_list);
810 spin_lock_init(&ei->i_prealloc_lock);
811 /*
812 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
813 * therefore it can be null here. Don't check it, just initialize
814 * jinode.
815 */
816 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
817 ei->i_reserved_data_blocks = 0;
818 ei->i_reserved_meta_blocks = 0;
819 ei->i_allocated_meta_blocks = 0;
820 ei->i_da_metadata_calc_len = 0;
821 ei->i_delalloc_reserved_flag = 0;
822 spin_lock_init(&(ei->i_block_reservation_lock));
823 #ifdef CONFIG_QUOTA
824 ei->i_reserved_quota = 0;
825 #endif
826 INIT_LIST_HEAD(&ei->i_completed_io_list);
827 spin_lock_init(&ei->i_completed_io_lock);
828 ei->cur_aio_dio = NULL;
829 ei->i_sync_tid = 0;
830 ei->i_datasync_tid = 0;
831 atomic_set(&ei->i_ioend_count, 0);
832
833 return &ei->vfs_inode;
834 }
835
836 static int ext4_drop_inode(struct inode *inode)
837 {
838 int drop = generic_drop_inode(inode);
839
840 trace_ext4_drop_inode(inode, drop);
841 return drop;
842 }
843
844 static void ext4_destroy_inode(struct inode *inode)
845 {
846 ext4_ioend_wait(inode);
847 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
848 ext4_msg(inode->i_sb, KERN_ERR,
849 "Inode %lu (%p): orphan list check failed!",
850 inode->i_ino, EXT4_I(inode));
851 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
852 EXT4_I(inode), sizeof(struct ext4_inode_info),
853 true);
854 dump_stack();
855 }
856 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
857 }
858
859 static void init_once(void *foo)
860 {
861 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
862
863 INIT_LIST_HEAD(&ei->i_orphan);
864 #ifdef CONFIG_EXT4_FS_XATTR
865 init_rwsem(&ei->xattr_sem);
866 #endif
867 init_rwsem(&ei->i_data_sem);
868 inode_init_once(&ei->vfs_inode);
869 }
870
871 static int init_inodecache(void)
872 {
873 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
874 sizeof(struct ext4_inode_info),
875 0, (SLAB_RECLAIM_ACCOUNT|
876 SLAB_MEM_SPREAD),
877 init_once);
878 if (ext4_inode_cachep == NULL)
879 return -ENOMEM;
880 return 0;
881 }
882
883 static void destroy_inodecache(void)
884 {
885 kmem_cache_destroy(ext4_inode_cachep);
886 }
887
888 void ext4_clear_inode(struct inode *inode)
889 {
890 invalidate_inode_buffers(inode);
891 end_writeback(inode);
892 dquot_drop(inode);
893 ext4_discard_preallocations(inode);
894 if (EXT4_JOURNAL(inode))
895 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
896 &EXT4_I(inode)->jinode);
897 }
898
899 static inline void ext4_show_quota_options(struct seq_file *seq,
900 struct super_block *sb)
901 {
902 #if defined(CONFIG_QUOTA)
903 struct ext4_sb_info *sbi = EXT4_SB(sb);
904
905 if (sbi->s_jquota_fmt) {
906 char *fmtname = "";
907
908 switch (sbi->s_jquota_fmt) {
909 case QFMT_VFS_OLD:
910 fmtname = "vfsold";
911 break;
912 case QFMT_VFS_V0:
913 fmtname = "vfsv0";
914 break;
915 case QFMT_VFS_V1:
916 fmtname = "vfsv1";
917 break;
918 }
919 seq_printf(seq, ",jqfmt=%s", fmtname);
920 }
921
922 if (sbi->s_qf_names[USRQUOTA])
923 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
924
925 if (sbi->s_qf_names[GRPQUOTA])
926 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
927
928 if (test_opt(sb, USRQUOTA))
929 seq_puts(seq, ",usrquota");
930
931 if (test_opt(sb, GRPQUOTA))
932 seq_puts(seq, ",grpquota");
933 #endif
934 }
935
936 /*
937 * Show an option if
938 * - it's set to a non-default value OR
939 * - if the per-sb default is different from the global default
940 */
941 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
942 {
943 int def_errors;
944 unsigned long def_mount_opts;
945 struct super_block *sb = vfs->mnt_sb;
946 struct ext4_sb_info *sbi = EXT4_SB(sb);
947 struct ext4_super_block *es = sbi->s_es;
948
949 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
950 def_errors = le16_to_cpu(es->s_errors);
951
952 if (sbi->s_sb_block != 1)
953 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
954 if (test_opt(sb, MINIX_DF))
955 seq_puts(seq, ",minixdf");
956 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
957 seq_puts(seq, ",grpid");
958 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
959 seq_puts(seq, ",nogrpid");
960 if (sbi->s_resuid != EXT4_DEF_RESUID ||
961 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
962 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
963 }
964 if (sbi->s_resgid != EXT4_DEF_RESGID ||
965 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
966 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
967 }
968 if (test_opt(sb, ERRORS_RO)) {
969 if (def_errors == EXT4_ERRORS_PANIC ||
970 def_errors == EXT4_ERRORS_CONTINUE) {
971 seq_puts(seq, ",errors=remount-ro");
972 }
973 }
974 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
975 seq_puts(seq, ",errors=continue");
976 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
977 seq_puts(seq, ",errors=panic");
978 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
979 seq_puts(seq, ",nouid32");
980 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
981 seq_puts(seq, ",debug");
982 if (test_opt(sb, OLDALLOC))
983 seq_puts(seq, ",oldalloc");
984 #ifdef CONFIG_EXT4_FS_XATTR
985 if (test_opt(sb, XATTR_USER) &&
986 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
987 seq_puts(seq, ",user_xattr");
988 if (!test_opt(sb, XATTR_USER) &&
989 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
990 seq_puts(seq, ",nouser_xattr");
991 }
992 #endif
993 #ifdef CONFIG_EXT4_FS_POSIX_ACL
994 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
995 seq_puts(seq, ",acl");
996 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
997 seq_puts(seq, ",noacl");
998 #endif
999 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
1000 seq_printf(seq, ",commit=%u",
1001 (unsigned) (sbi->s_commit_interval / HZ));
1002 }
1003 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1004 seq_printf(seq, ",min_batch_time=%u",
1005 (unsigned) sbi->s_min_batch_time);
1006 }
1007 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1008 seq_printf(seq, ",max_batch_time=%u",
1009 (unsigned) sbi->s_min_batch_time);
1010 }
1011
1012 /*
1013 * We're changing the default of barrier mount option, so
1014 * let's always display its mount state so it's clear what its
1015 * status is.
1016 */
1017 seq_puts(seq, ",barrier=");
1018 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1019 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1020 seq_puts(seq, ",journal_async_commit");
1021 else if (test_opt(sb, JOURNAL_CHECKSUM))
1022 seq_puts(seq, ",journal_checksum");
1023 if (test_opt(sb, I_VERSION))
1024 seq_puts(seq, ",i_version");
1025 if (!test_opt(sb, DELALLOC) &&
1026 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1027 seq_puts(seq, ",nodelalloc");
1028
1029 if (sbi->s_stripe)
1030 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1031 /*
1032 * journal mode get enabled in different ways
1033 * So just print the value even if we didn't specify it
1034 */
1035 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1036 seq_puts(seq, ",data=journal");
1037 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1038 seq_puts(seq, ",data=ordered");
1039 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1040 seq_puts(seq, ",data=writeback");
1041
1042 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1043 seq_printf(seq, ",inode_readahead_blks=%u",
1044 sbi->s_inode_readahead_blks);
1045
1046 if (test_opt(sb, DATA_ERR_ABORT))
1047 seq_puts(seq, ",data_err=abort");
1048
1049 if (test_opt(sb, NO_AUTO_DA_ALLOC))
1050 seq_puts(seq, ",noauto_da_alloc");
1051
1052 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1053 seq_puts(seq, ",discard");
1054
1055 if (test_opt(sb, NOLOAD))
1056 seq_puts(seq, ",norecovery");
1057
1058 if (test_opt(sb, DIOREAD_NOLOCK))
1059 seq_puts(seq, ",dioread_nolock");
1060
1061 if (test_opt(sb, BLOCK_VALIDITY) &&
1062 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1063 seq_puts(seq, ",block_validity");
1064
1065 if (!test_opt(sb, INIT_INODE_TABLE))
1066 seq_puts(seq, ",noinit_inode_table");
1067 else if (sbi->s_li_wait_mult)
1068 seq_printf(seq, ",init_inode_table=%u",
1069 (unsigned) sbi->s_li_wait_mult);
1070
1071 ext4_show_quota_options(seq, sb);
1072
1073 return 0;
1074 }
1075
1076 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1077 u64 ino, u32 generation)
1078 {
1079 struct inode *inode;
1080
1081 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1082 return ERR_PTR(-ESTALE);
1083 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1084 return ERR_PTR(-ESTALE);
1085
1086 /* iget isn't really right if the inode is currently unallocated!!
1087 *
1088 * ext4_read_inode will return a bad_inode if the inode had been
1089 * deleted, so we should be safe.
1090 *
1091 * Currently we don't know the generation for parent directory, so
1092 * a generation of 0 means "accept any"
1093 */
1094 inode = ext4_iget(sb, ino);
1095 if (IS_ERR(inode))
1096 return ERR_CAST(inode);
1097 if (generation && inode->i_generation != generation) {
1098 iput(inode);
1099 return ERR_PTR(-ESTALE);
1100 }
1101
1102 return inode;
1103 }
1104
1105 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1106 int fh_len, int fh_type)
1107 {
1108 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1109 ext4_nfs_get_inode);
1110 }
1111
1112 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1113 int fh_len, int fh_type)
1114 {
1115 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1116 ext4_nfs_get_inode);
1117 }
1118
1119 /*
1120 * Try to release metadata pages (indirect blocks, directories) which are
1121 * mapped via the block device. Since these pages could have journal heads
1122 * which would prevent try_to_free_buffers() from freeing them, we must use
1123 * jbd2 layer's try_to_free_buffers() function to release them.
1124 */
1125 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1126 gfp_t wait)
1127 {
1128 journal_t *journal = EXT4_SB(sb)->s_journal;
1129
1130 WARN_ON(PageChecked(page));
1131 if (!page_has_buffers(page))
1132 return 0;
1133 if (journal)
1134 return jbd2_journal_try_to_free_buffers(journal, page,
1135 wait & ~__GFP_WAIT);
1136 return try_to_free_buffers(page);
1137 }
1138
1139 #ifdef CONFIG_QUOTA
1140 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1141 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1142
1143 static int ext4_write_dquot(struct dquot *dquot);
1144 static int ext4_acquire_dquot(struct dquot *dquot);
1145 static int ext4_release_dquot(struct dquot *dquot);
1146 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1147 static int ext4_write_info(struct super_block *sb, int type);
1148 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1149 char *path);
1150 static int ext4_quota_off(struct super_block *sb, int type);
1151 static int ext4_quota_on_mount(struct super_block *sb, int type);
1152 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1153 size_t len, loff_t off);
1154 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1155 const char *data, size_t len, loff_t off);
1156
1157 static const struct dquot_operations ext4_quota_operations = {
1158 #ifdef CONFIG_QUOTA
1159 .get_reserved_space = ext4_get_reserved_space,
1160 #endif
1161 .write_dquot = ext4_write_dquot,
1162 .acquire_dquot = ext4_acquire_dquot,
1163 .release_dquot = ext4_release_dquot,
1164 .mark_dirty = ext4_mark_dquot_dirty,
1165 .write_info = ext4_write_info,
1166 .alloc_dquot = dquot_alloc,
1167 .destroy_dquot = dquot_destroy,
1168 };
1169
1170 static const struct quotactl_ops ext4_qctl_operations = {
1171 .quota_on = ext4_quota_on,
1172 .quota_off = ext4_quota_off,
1173 .quota_sync = dquot_quota_sync,
1174 .get_info = dquot_get_dqinfo,
1175 .set_info = dquot_set_dqinfo,
1176 .get_dqblk = dquot_get_dqblk,
1177 .set_dqblk = dquot_set_dqblk
1178 };
1179 #endif
1180
1181 static const struct super_operations ext4_sops = {
1182 .alloc_inode = ext4_alloc_inode,
1183 .destroy_inode = ext4_destroy_inode,
1184 .write_inode = ext4_write_inode,
1185 .dirty_inode = ext4_dirty_inode,
1186 .drop_inode = ext4_drop_inode,
1187 .evict_inode = ext4_evict_inode,
1188 .put_super = ext4_put_super,
1189 .sync_fs = ext4_sync_fs,
1190 .freeze_fs = ext4_freeze,
1191 .unfreeze_fs = ext4_unfreeze,
1192 .statfs = ext4_statfs,
1193 .remount_fs = ext4_remount,
1194 .show_options = ext4_show_options,
1195 #ifdef CONFIG_QUOTA
1196 .quota_read = ext4_quota_read,
1197 .quota_write = ext4_quota_write,
1198 #endif
1199 .bdev_try_to_free_page = bdev_try_to_free_page,
1200 };
1201
1202 static const struct super_operations ext4_nojournal_sops = {
1203 .alloc_inode = ext4_alloc_inode,
1204 .destroy_inode = ext4_destroy_inode,
1205 .write_inode = ext4_write_inode,
1206 .dirty_inode = ext4_dirty_inode,
1207 .drop_inode = ext4_drop_inode,
1208 .evict_inode = ext4_evict_inode,
1209 .write_super = ext4_write_super,
1210 .put_super = ext4_put_super,
1211 .statfs = ext4_statfs,
1212 .remount_fs = ext4_remount,
1213 .show_options = ext4_show_options,
1214 #ifdef CONFIG_QUOTA
1215 .quota_read = ext4_quota_read,
1216 .quota_write = ext4_quota_write,
1217 #endif
1218 .bdev_try_to_free_page = bdev_try_to_free_page,
1219 };
1220
1221 static const struct export_operations ext4_export_ops = {
1222 .fh_to_dentry = ext4_fh_to_dentry,
1223 .fh_to_parent = ext4_fh_to_parent,
1224 .get_parent = ext4_get_parent,
1225 };
1226
1227 enum {
1228 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1229 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1230 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1231 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1232 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1233 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1234 Opt_journal_update, Opt_journal_dev,
1235 Opt_journal_checksum, Opt_journal_async_commit,
1236 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1237 Opt_data_err_abort, Opt_data_err_ignore,
1238 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1239 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1240 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1241 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1242 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1243 Opt_block_validity, Opt_noblock_validity,
1244 Opt_inode_readahead_blks, Opt_journal_ioprio,
1245 Opt_dioread_nolock, Opt_dioread_lock,
1246 Opt_discard, Opt_nodiscard,
1247 Opt_init_inode_table, Opt_noinit_inode_table,
1248 };
1249
1250 static const match_table_t tokens = {
1251 {Opt_bsd_df, "bsddf"},
1252 {Opt_minix_df, "minixdf"},
1253 {Opt_grpid, "grpid"},
1254 {Opt_grpid, "bsdgroups"},
1255 {Opt_nogrpid, "nogrpid"},
1256 {Opt_nogrpid, "sysvgroups"},
1257 {Opt_resgid, "resgid=%u"},
1258 {Opt_resuid, "resuid=%u"},
1259 {Opt_sb, "sb=%u"},
1260 {Opt_err_cont, "errors=continue"},
1261 {Opt_err_panic, "errors=panic"},
1262 {Opt_err_ro, "errors=remount-ro"},
1263 {Opt_nouid32, "nouid32"},
1264 {Opt_debug, "debug"},
1265 {Opt_oldalloc, "oldalloc"},
1266 {Opt_orlov, "orlov"},
1267 {Opt_user_xattr, "user_xattr"},
1268 {Opt_nouser_xattr, "nouser_xattr"},
1269 {Opt_acl, "acl"},
1270 {Opt_noacl, "noacl"},
1271 {Opt_noload, "noload"},
1272 {Opt_noload, "norecovery"},
1273 {Opt_nobh, "nobh"},
1274 {Opt_bh, "bh"},
1275 {Opt_commit, "commit=%u"},
1276 {Opt_min_batch_time, "min_batch_time=%u"},
1277 {Opt_max_batch_time, "max_batch_time=%u"},
1278 {Opt_journal_update, "journal=update"},
1279 {Opt_journal_dev, "journal_dev=%u"},
1280 {Opt_journal_checksum, "journal_checksum"},
1281 {Opt_journal_async_commit, "journal_async_commit"},
1282 {Opt_abort, "abort"},
1283 {Opt_data_journal, "data=journal"},
1284 {Opt_data_ordered, "data=ordered"},
1285 {Opt_data_writeback, "data=writeback"},
1286 {Opt_data_err_abort, "data_err=abort"},
1287 {Opt_data_err_ignore, "data_err=ignore"},
1288 {Opt_offusrjquota, "usrjquota="},
1289 {Opt_usrjquota, "usrjquota=%s"},
1290 {Opt_offgrpjquota, "grpjquota="},
1291 {Opt_grpjquota, "grpjquota=%s"},
1292 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1293 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1294 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1295 {Opt_grpquota, "grpquota"},
1296 {Opt_noquota, "noquota"},
1297 {Opt_quota, "quota"},
1298 {Opt_usrquota, "usrquota"},
1299 {Opt_barrier, "barrier=%u"},
1300 {Opt_barrier, "barrier"},
1301 {Opt_nobarrier, "nobarrier"},
1302 {Opt_i_version, "i_version"},
1303 {Opt_stripe, "stripe=%u"},
1304 {Opt_resize, "resize"},
1305 {Opt_delalloc, "delalloc"},
1306 {Opt_nodelalloc, "nodelalloc"},
1307 {Opt_block_validity, "block_validity"},
1308 {Opt_noblock_validity, "noblock_validity"},
1309 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1310 {Opt_journal_ioprio, "journal_ioprio=%u"},
1311 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1312 {Opt_auto_da_alloc, "auto_da_alloc"},
1313 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1314 {Opt_dioread_nolock, "dioread_nolock"},
1315 {Opt_dioread_lock, "dioread_lock"},
1316 {Opt_discard, "discard"},
1317 {Opt_nodiscard, "nodiscard"},
1318 {Opt_init_inode_table, "init_itable=%u"},
1319 {Opt_init_inode_table, "init_itable"},
1320 {Opt_noinit_inode_table, "noinit_itable"},
1321 {Opt_err, NULL},
1322 };
1323
1324 static ext4_fsblk_t get_sb_block(void **data)
1325 {
1326 ext4_fsblk_t sb_block;
1327 char *options = (char *) *data;
1328
1329 if (!options || strncmp(options, "sb=", 3) != 0)
1330 return 1; /* Default location */
1331
1332 options += 3;
1333 /* TODO: use simple_strtoll with >32bit ext4 */
1334 sb_block = simple_strtoul(options, &options, 0);
1335 if (*options && *options != ',') {
1336 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1337 (char *) *data);
1338 return 1;
1339 }
1340 if (*options == ',')
1341 options++;
1342 *data = (void *) options;
1343
1344 return sb_block;
1345 }
1346
1347 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1348 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1349 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1350
1351 #ifdef CONFIG_QUOTA
1352 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1353 {
1354 struct ext4_sb_info *sbi = EXT4_SB(sb);
1355 char *qname;
1356
1357 if (sb_any_quota_loaded(sb) &&
1358 !sbi->s_qf_names[qtype]) {
1359 ext4_msg(sb, KERN_ERR,
1360 "Cannot change journaled "
1361 "quota options when quota turned on");
1362 return 0;
1363 }
1364 qname = match_strdup(args);
1365 if (!qname) {
1366 ext4_msg(sb, KERN_ERR,
1367 "Not enough memory for storing quotafile name");
1368 return 0;
1369 }
1370 if (sbi->s_qf_names[qtype] &&
1371 strcmp(sbi->s_qf_names[qtype], qname)) {
1372 ext4_msg(sb, KERN_ERR,
1373 "%s quota file already specified", QTYPE2NAME(qtype));
1374 kfree(qname);
1375 return 0;
1376 }
1377 sbi->s_qf_names[qtype] = qname;
1378 if (strchr(sbi->s_qf_names[qtype], '/')) {
1379 ext4_msg(sb, KERN_ERR,
1380 "quotafile must be on filesystem root");
1381 kfree(sbi->s_qf_names[qtype]);
1382 sbi->s_qf_names[qtype] = NULL;
1383 return 0;
1384 }
1385 set_opt(sbi->s_mount_opt, QUOTA);
1386 return 1;
1387 }
1388
1389 static int clear_qf_name(struct super_block *sb, int qtype)
1390 {
1391
1392 struct ext4_sb_info *sbi = EXT4_SB(sb);
1393
1394 if (sb_any_quota_loaded(sb) &&
1395 sbi->s_qf_names[qtype]) {
1396 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1397 " when quota turned on");
1398 return 0;
1399 }
1400 /*
1401 * The space will be released later when all options are confirmed
1402 * to be correct
1403 */
1404 sbi->s_qf_names[qtype] = NULL;
1405 return 1;
1406 }
1407 #endif
1408
1409 static int parse_options(char *options, struct super_block *sb,
1410 unsigned long *journal_devnum,
1411 unsigned int *journal_ioprio,
1412 ext4_fsblk_t *n_blocks_count, int is_remount)
1413 {
1414 struct ext4_sb_info *sbi = EXT4_SB(sb);
1415 char *p;
1416 substring_t args[MAX_OPT_ARGS];
1417 int data_opt = 0;
1418 int option;
1419 #ifdef CONFIG_QUOTA
1420 int qfmt;
1421 #endif
1422
1423 if (!options)
1424 return 1;
1425
1426 while ((p = strsep(&options, ",")) != NULL) {
1427 int token;
1428 if (!*p)
1429 continue;
1430
1431 /*
1432 * Initialize args struct so we know whether arg was
1433 * found; some options take optional arguments.
1434 */
1435 args[0].to = args[0].from = 0;
1436 token = match_token(p, tokens, args);
1437 switch (token) {
1438 case Opt_bsd_df:
1439 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1440 clear_opt(sbi->s_mount_opt, MINIX_DF);
1441 break;
1442 case Opt_minix_df:
1443 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1444 set_opt(sbi->s_mount_opt, MINIX_DF);
1445
1446 break;
1447 case Opt_grpid:
1448 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1449 set_opt(sbi->s_mount_opt, GRPID);
1450
1451 break;
1452 case Opt_nogrpid:
1453 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1454 clear_opt(sbi->s_mount_opt, GRPID);
1455
1456 break;
1457 case Opt_resuid:
1458 if (match_int(&args[0], &option))
1459 return 0;
1460 sbi->s_resuid = option;
1461 break;
1462 case Opt_resgid:
1463 if (match_int(&args[0], &option))
1464 return 0;
1465 sbi->s_resgid = option;
1466 break;
1467 case Opt_sb:
1468 /* handled by get_sb_block() instead of here */
1469 /* *sb_block = match_int(&args[0]); */
1470 break;
1471 case Opt_err_panic:
1472 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1473 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1474 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1475 break;
1476 case Opt_err_ro:
1477 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1478 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1479 set_opt(sbi->s_mount_opt, ERRORS_RO);
1480 break;
1481 case Opt_err_cont:
1482 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1483 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1484 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1485 break;
1486 case Opt_nouid32:
1487 set_opt(sbi->s_mount_opt, NO_UID32);
1488 break;
1489 case Opt_debug:
1490 set_opt(sbi->s_mount_opt, DEBUG);
1491 break;
1492 case Opt_oldalloc:
1493 set_opt(sbi->s_mount_opt, OLDALLOC);
1494 break;
1495 case Opt_orlov:
1496 clear_opt(sbi->s_mount_opt, OLDALLOC);
1497 break;
1498 #ifdef CONFIG_EXT4_FS_XATTR
1499 case Opt_user_xattr:
1500 set_opt(sbi->s_mount_opt, XATTR_USER);
1501 break;
1502 case Opt_nouser_xattr:
1503 clear_opt(sbi->s_mount_opt, XATTR_USER);
1504 break;
1505 #else
1506 case Opt_user_xattr:
1507 case Opt_nouser_xattr:
1508 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1509 break;
1510 #endif
1511 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1512 case Opt_acl:
1513 set_opt(sbi->s_mount_opt, POSIX_ACL);
1514 break;
1515 case Opt_noacl:
1516 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1517 break;
1518 #else
1519 case Opt_acl:
1520 case Opt_noacl:
1521 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1522 break;
1523 #endif
1524 case Opt_journal_update:
1525 /* @@@ FIXME */
1526 /* Eventually we will want to be able to create
1527 a journal file here. For now, only allow the
1528 user to specify an existing inode to be the
1529 journal file. */
1530 if (is_remount) {
1531 ext4_msg(sb, KERN_ERR,
1532 "Cannot specify journal on remount");
1533 return 0;
1534 }
1535 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1536 break;
1537 case Opt_journal_dev:
1538 if (is_remount) {
1539 ext4_msg(sb, KERN_ERR,
1540 "Cannot specify journal on remount");
1541 return 0;
1542 }
1543 if (match_int(&args[0], &option))
1544 return 0;
1545 *journal_devnum = option;
1546 break;
1547 case Opt_journal_checksum:
1548 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1549 break;
1550 case Opt_journal_async_commit:
1551 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1552 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1553 break;
1554 case Opt_noload:
1555 set_opt(sbi->s_mount_opt, NOLOAD);
1556 break;
1557 case Opt_commit:
1558 if (match_int(&args[0], &option))
1559 return 0;
1560 if (option < 0)
1561 return 0;
1562 if (option == 0)
1563 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1564 sbi->s_commit_interval = HZ * option;
1565 break;
1566 case Opt_max_batch_time:
1567 if (match_int(&args[0], &option))
1568 return 0;
1569 if (option < 0)
1570 return 0;
1571 if (option == 0)
1572 option = EXT4_DEF_MAX_BATCH_TIME;
1573 sbi->s_max_batch_time = option;
1574 break;
1575 case Opt_min_batch_time:
1576 if (match_int(&args[0], &option))
1577 return 0;
1578 if (option < 0)
1579 return 0;
1580 sbi->s_min_batch_time = option;
1581 break;
1582 case Opt_data_journal:
1583 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1584 goto datacheck;
1585 case Opt_data_ordered:
1586 data_opt = EXT4_MOUNT_ORDERED_DATA;
1587 goto datacheck;
1588 case Opt_data_writeback:
1589 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1590 datacheck:
1591 if (is_remount) {
1592 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1593 ext4_msg(sb, KERN_ERR,
1594 "Cannot change data mode on remount");
1595 return 0;
1596 }
1597 } else {
1598 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1599 sbi->s_mount_opt |= data_opt;
1600 }
1601 break;
1602 case Opt_data_err_abort:
1603 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1604 break;
1605 case Opt_data_err_ignore:
1606 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1607 break;
1608 #ifdef CONFIG_QUOTA
1609 case Opt_usrjquota:
1610 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1611 return 0;
1612 break;
1613 case Opt_grpjquota:
1614 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1615 return 0;
1616 break;
1617 case Opt_offusrjquota:
1618 if (!clear_qf_name(sb, USRQUOTA))
1619 return 0;
1620 break;
1621 case Opt_offgrpjquota:
1622 if (!clear_qf_name(sb, GRPQUOTA))
1623 return 0;
1624 break;
1625
1626 case Opt_jqfmt_vfsold:
1627 qfmt = QFMT_VFS_OLD;
1628 goto set_qf_format;
1629 case Opt_jqfmt_vfsv0:
1630 qfmt = QFMT_VFS_V0;
1631 goto set_qf_format;
1632 case Opt_jqfmt_vfsv1:
1633 qfmt = QFMT_VFS_V1;
1634 set_qf_format:
1635 if (sb_any_quota_loaded(sb) &&
1636 sbi->s_jquota_fmt != qfmt) {
1637 ext4_msg(sb, KERN_ERR, "Cannot change "
1638 "journaled quota options when "
1639 "quota turned on");
1640 return 0;
1641 }
1642 sbi->s_jquota_fmt = qfmt;
1643 break;
1644 case Opt_quota:
1645 case Opt_usrquota:
1646 set_opt(sbi->s_mount_opt, QUOTA);
1647 set_opt(sbi->s_mount_opt, USRQUOTA);
1648 break;
1649 case Opt_grpquota:
1650 set_opt(sbi->s_mount_opt, QUOTA);
1651 set_opt(sbi->s_mount_opt, GRPQUOTA);
1652 break;
1653 case Opt_noquota:
1654 if (sb_any_quota_loaded(sb)) {
1655 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1656 "options when quota turned on");
1657 return 0;
1658 }
1659 clear_opt(sbi->s_mount_opt, QUOTA);
1660 clear_opt(sbi->s_mount_opt, USRQUOTA);
1661 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1662 break;
1663 #else
1664 case Opt_quota:
1665 case Opt_usrquota:
1666 case Opt_grpquota:
1667 ext4_msg(sb, KERN_ERR,
1668 "quota options not supported");
1669 break;
1670 case Opt_usrjquota:
1671 case Opt_grpjquota:
1672 case Opt_offusrjquota:
1673 case Opt_offgrpjquota:
1674 case Opt_jqfmt_vfsold:
1675 case Opt_jqfmt_vfsv0:
1676 case Opt_jqfmt_vfsv1:
1677 ext4_msg(sb, KERN_ERR,
1678 "journaled quota options not supported");
1679 break;
1680 case Opt_noquota:
1681 break;
1682 #endif
1683 case Opt_abort:
1684 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1685 break;
1686 case Opt_nobarrier:
1687 clear_opt(sbi->s_mount_opt, BARRIER);
1688 break;
1689 case Opt_barrier:
1690 if (args[0].from) {
1691 if (match_int(&args[0], &option))
1692 return 0;
1693 } else
1694 option = 1; /* No argument, default to 1 */
1695 if (option)
1696 set_opt(sbi->s_mount_opt, BARRIER);
1697 else
1698 clear_opt(sbi->s_mount_opt, BARRIER);
1699 break;
1700 case Opt_ignore:
1701 break;
1702 case Opt_resize:
1703 if (!is_remount) {
1704 ext4_msg(sb, KERN_ERR,
1705 "resize option only available "
1706 "for remount");
1707 return 0;
1708 }
1709 if (match_int(&args[0], &option) != 0)
1710 return 0;
1711 *n_blocks_count = option;
1712 break;
1713 case Opt_nobh:
1714 ext4_msg(sb, KERN_WARNING,
1715 "Ignoring deprecated nobh option");
1716 break;
1717 case Opt_bh:
1718 ext4_msg(sb, KERN_WARNING,
1719 "Ignoring deprecated bh option");
1720 break;
1721 case Opt_i_version:
1722 set_opt(sbi->s_mount_opt, I_VERSION);
1723 sb->s_flags |= MS_I_VERSION;
1724 break;
1725 case Opt_nodelalloc:
1726 clear_opt(sbi->s_mount_opt, DELALLOC);
1727 break;
1728 case Opt_stripe:
1729 if (match_int(&args[0], &option))
1730 return 0;
1731 if (option < 0)
1732 return 0;
1733 sbi->s_stripe = option;
1734 break;
1735 case Opt_delalloc:
1736 set_opt(sbi->s_mount_opt, DELALLOC);
1737 break;
1738 case Opt_block_validity:
1739 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1740 break;
1741 case Opt_noblock_validity:
1742 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1743 break;
1744 case Opt_inode_readahead_blks:
1745 if (match_int(&args[0], &option))
1746 return 0;
1747 if (option < 0 || option > (1 << 30))
1748 return 0;
1749 if (!is_power_of_2(option)) {
1750 ext4_msg(sb, KERN_ERR,
1751 "EXT4-fs: inode_readahead_blks"
1752 " must be a power of 2");
1753 return 0;
1754 }
1755 sbi->s_inode_readahead_blks = option;
1756 break;
1757 case Opt_journal_ioprio:
1758 if (match_int(&args[0], &option))
1759 return 0;
1760 if (option < 0 || option > 7)
1761 break;
1762 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1763 option);
1764 break;
1765 case Opt_noauto_da_alloc:
1766 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1767 break;
1768 case Opt_auto_da_alloc:
1769 if (args[0].from) {
1770 if (match_int(&args[0], &option))
1771 return 0;
1772 } else
1773 option = 1; /* No argument, default to 1 */
1774 if (option)
1775 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1776 else
1777 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1778 break;
1779 case Opt_discard:
1780 set_opt(sbi->s_mount_opt, DISCARD);
1781 break;
1782 case Opt_nodiscard:
1783 clear_opt(sbi->s_mount_opt, DISCARD);
1784 break;
1785 case Opt_dioread_nolock:
1786 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1787 break;
1788 case Opt_dioread_lock:
1789 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1790 break;
1791 case Opt_init_inode_table:
1792 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1793 if (args[0].from) {
1794 if (match_int(&args[0], &option))
1795 return 0;
1796 } else
1797 option = EXT4_DEF_LI_WAIT_MULT;
1798 if (option < 0)
1799 return 0;
1800 sbi->s_li_wait_mult = option;
1801 break;
1802 case Opt_noinit_inode_table:
1803 clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1804 break;
1805 default:
1806 ext4_msg(sb, KERN_ERR,
1807 "Unrecognized mount option \"%s\" "
1808 "or missing value", p);
1809 return 0;
1810 }
1811 }
1812 #ifdef CONFIG_QUOTA
1813 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1814 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1815 clear_opt(sbi->s_mount_opt, USRQUOTA);
1816
1817 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1818 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1819
1820 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1821 ext4_msg(sb, KERN_ERR, "old and new quota "
1822 "format mixing");
1823 return 0;
1824 }
1825
1826 if (!sbi->s_jquota_fmt) {
1827 ext4_msg(sb, KERN_ERR, "journaled quota format "
1828 "not specified");
1829 return 0;
1830 }
1831 } else {
1832 if (sbi->s_jquota_fmt) {
1833 ext4_msg(sb, KERN_ERR, "journaled quota format "
1834 "specified with no journaling "
1835 "enabled");
1836 return 0;
1837 }
1838 }
1839 #endif
1840 return 1;
1841 }
1842
1843 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1844 int read_only)
1845 {
1846 struct ext4_sb_info *sbi = EXT4_SB(sb);
1847 int res = 0;
1848
1849 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1850 ext4_msg(sb, KERN_ERR, "revision level too high, "
1851 "forcing read-only mode");
1852 res = MS_RDONLY;
1853 }
1854 if (read_only)
1855 return res;
1856 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1857 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1858 "running e2fsck is recommended");
1859 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1860 ext4_msg(sb, KERN_WARNING,
1861 "warning: mounting fs with errors, "
1862 "running e2fsck is recommended");
1863 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1864 le16_to_cpu(es->s_mnt_count) >=
1865 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1866 ext4_msg(sb, KERN_WARNING,
1867 "warning: maximal mount count reached, "
1868 "running e2fsck is recommended");
1869 else if (le32_to_cpu(es->s_checkinterval) &&
1870 (le32_to_cpu(es->s_lastcheck) +
1871 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1872 ext4_msg(sb, KERN_WARNING,
1873 "warning: checktime reached, "
1874 "running e2fsck is recommended");
1875 if (!sbi->s_journal)
1876 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1877 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1878 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1879 le16_add_cpu(&es->s_mnt_count, 1);
1880 es->s_mtime = cpu_to_le32(get_seconds());
1881 ext4_update_dynamic_rev(sb);
1882 if (sbi->s_journal)
1883 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1884
1885 ext4_commit_super(sb, 1);
1886 if (test_opt(sb, DEBUG))
1887 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1888 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1889 sb->s_blocksize,
1890 sbi->s_groups_count,
1891 EXT4_BLOCKS_PER_GROUP(sb),
1892 EXT4_INODES_PER_GROUP(sb),
1893 sbi->s_mount_opt);
1894
1895 return res;
1896 }
1897
1898 static int ext4_fill_flex_info(struct super_block *sb)
1899 {
1900 struct ext4_sb_info *sbi = EXT4_SB(sb);
1901 struct ext4_group_desc *gdp = NULL;
1902 ext4_group_t flex_group_count;
1903 ext4_group_t flex_group;
1904 int groups_per_flex = 0;
1905 size_t size;
1906 int i;
1907
1908 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1909 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1910
1911 if (groups_per_flex < 2) {
1912 sbi->s_log_groups_per_flex = 0;
1913 return 1;
1914 }
1915
1916 /* We allocate both existing and potentially added groups */
1917 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1918 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1919 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1920 size = flex_group_count * sizeof(struct flex_groups);
1921 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1922 if (sbi->s_flex_groups == NULL) {
1923 sbi->s_flex_groups = vmalloc(size);
1924 if (sbi->s_flex_groups)
1925 memset(sbi->s_flex_groups, 0, size);
1926 }
1927 if (sbi->s_flex_groups == NULL) {
1928 ext4_msg(sb, KERN_ERR, "not enough memory for "
1929 "%u flex groups", flex_group_count);
1930 goto failed;
1931 }
1932
1933 for (i = 0; i < sbi->s_groups_count; i++) {
1934 gdp = ext4_get_group_desc(sb, i, NULL);
1935
1936 flex_group = ext4_flex_group(sbi, i);
1937 atomic_add(ext4_free_inodes_count(sb, gdp),
1938 &sbi->s_flex_groups[flex_group].free_inodes);
1939 atomic_add(ext4_free_blks_count(sb, gdp),
1940 &sbi->s_flex_groups[flex_group].free_blocks);
1941 atomic_add(ext4_used_dirs_count(sb, gdp),
1942 &sbi->s_flex_groups[flex_group].used_dirs);
1943 }
1944
1945 return 1;
1946 failed:
1947 return 0;
1948 }
1949
1950 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1951 struct ext4_group_desc *gdp)
1952 {
1953 __u16 crc = 0;
1954
1955 if (sbi->s_es->s_feature_ro_compat &
1956 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1957 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1958 __le32 le_group = cpu_to_le32(block_group);
1959
1960 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1961 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1962 crc = crc16(crc, (__u8 *)gdp, offset);
1963 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1964 /* for checksum of struct ext4_group_desc do the rest...*/
1965 if ((sbi->s_es->s_feature_incompat &
1966 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1967 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1968 crc = crc16(crc, (__u8 *)gdp + offset,
1969 le16_to_cpu(sbi->s_es->s_desc_size) -
1970 offset);
1971 }
1972
1973 return cpu_to_le16(crc);
1974 }
1975
1976 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1977 struct ext4_group_desc *gdp)
1978 {
1979 if ((sbi->s_es->s_feature_ro_compat &
1980 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1981 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1982 return 0;
1983
1984 return 1;
1985 }
1986
1987 /* Called at mount-time, super-block is locked */
1988 static int ext4_check_descriptors(struct super_block *sb,
1989 ext4_group_t *first_not_zeroed)
1990 {
1991 struct ext4_sb_info *sbi = EXT4_SB(sb);
1992 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1993 ext4_fsblk_t last_block;
1994 ext4_fsblk_t block_bitmap;
1995 ext4_fsblk_t inode_bitmap;
1996 ext4_fsblk_t inode_table;
1997 int flexbg_flag = 0;
1998 ext4_group_t i, grp = sbi->s_groups_count;
1999
2000 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2001 flexbg_flag = 1;
2002
2003 ext4_debug("Checking group descriptors");
2004
2005 for (i = 0; i < sbi->s_groups_count; i++) {
2006 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2007
2008 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2009 last_block = ext4_blocks_count(sbi->s_es) - 1;
2010 else
2011 last_block = first_block +
2012 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2013
2014 if ((grp == sbi->s_groups_count) &&
2015 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2016 grp = i;
2017
2018 block_bitmap = ext4_block_bitmap(sb, gdp);
2019 if (block_bitmap < first_block || block_bitmap > last_block) {
2020 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2021 "Block bitmap for group %u not in group "
2022 "(block %llu)!", i, block_bitmap);
2023 return 0;
2024 }
2025 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2026 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2027 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2028 "Inode bitmap for group %u not in group "
2029 "(block %llu)!", i, inode_bitmap);
2030 return 0;
2031 }
2032 inode_table = ext4_inode_table(sb, gdp);
2033 if (inode_table < first_block ||
2034 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2035 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2036 "Inode table for group %u not in group "
2037 "(block %llu)!", i, inode_table);
2038 return 0;
2039 }
2040 ext4_lock_group(sb, i);
2041 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2042 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2043 "Checksum for group %u failed (%u!=%u)",
2044 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2045 gdp)), le16_to_cpu(gdp->bg_checksum));
2046 if (!(sb->s_flags & MS_RDONLY)) {
2047 ext4_unlock_group(sb, i);
2048 return 0;
2049 }
2050 }
2051 ext4_unlock_group(sb, i);
2052 if (!flexbg_flag)
2053 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2054 }
2055 if (NULL != first_not_zeroed)
2056 *first_not_zeroed = grp;
2057
2058 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2059 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2060 return 1;
2061 }
2062
2063 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2064 * the superblock) which were deleted from all directories, but held open by
2065 * a process at the time of a crash. We walk the list and try to delete these
2066 * inodes at recovery time (only with a read-write filesystem).
2067 *
2068 * In order to keep the orphan inode chain consistent during traversal (in
2069 * case of crash during recovery), we link each inode into the superblock
2070 * orphan list_head and handle it the same way as an inode deletion during
2071 * normal operation (which journals the operations for us).
2072 *
2073 * We only do an iget() and an iput() on each inode, which is very safe if we
2074 * accidentally point at an in-use or already deleted inode. The worst that
2075 * can happen in this case is that we get a "bit already cleared" message from
2076 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2077 * e2fsck was run on this filesystem, and it must have already done the orphan
2078 * inode cleanup for us, so we can safely abort without any further action.
2079 */
2080 static void ext4_orphan_cleanup(struct super_block *sb,
2081 struct ext4_super_block *es)
2082 {
2083 unsigned int s_flags = sb->s_flags;
2084 int nr_orphans = 0, nr_truncates = 0;
2085 #ifdef CONFIG_QUOTA
2086 int i;
2087 #endif
2088 if (!es->s_last_orphan) {
2089 jbd_debug(4, "no orphan inodes to clean up\n");
2090 return;
2091 }
2092
2093 if (bdev_read_only(sb->s_bdev)) {
2094 ext4_msg(sb, KERN_ERR, "write access "
2095 "unavailable, skipping orphan cleanup");
2096 return;
2097 }
2098
2099 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2100 if (es->s_last_orphan)
2101 jbd_debug(1, "Errors on filesystem, "
2102 "clearing orphan list.\n");
2103 es->s_last_orphan = 0;
2104 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2105 return;
2106 }
2107
2108 if (s_flags & MS_RDONLY) {
2109 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2110 sb->s_flags &= ~MS_RDONLY;
2111 }
2112 #ifdef CONFIG_QUOTA
2113 /* Needed for iput() to work correctly and not trash data */
2114 sb->s_flags |= MS_ACTIVE;
2115 /* Turn on quotas so that they are updated correctly */
2116 for (i = 0; i < MAXQUOTAS; i++) {
2117 if (EXT4_SB(sb)->s_qf_names[i]) {
2118 int ret = ext4_quota_on_mount(sb, i);
2119 if (ret < 0)
2120 ext4_msg(sb, KERN_ERR,
2121 "Cannot turn on journaled "
2122 "quota: error %d", ret);
2123 }
2124 }
2125 #endif
2126
2127 while (es->s_last_orphan) {
2128 struct inode *inode;
2129
2130 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2131 if (IS_ERR(inode)) {
2132 es->s_last_orphan = 0;
2133 break;
2134 }
2135
2136 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2137 dquot_initialize(inode);
2138 if (inode->i_nlink) {
2139 ext4_msg(sb, KERN_DEBUG,
2140 "%s: truncating inode %lu to %lld bytes",
2141 __func__, inode->i_ino, inode->i_size);
2142 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2143 inode->i_ino, inode->i_size);
2144 ext4_truncate(inode);
2145 nr_truncates++;
2146 } else {
2147 ext4_msg(sb, KERN_DEBUG,
2148 "%s: deleting unreferenced inode %lu",
2149 __func__, inode->i_ino);
2150 jbd_debug(2, "deleting unreferenced inode %lu\n",
2151 inode->i_ino);
2152 nr_orphans++;
2153 }
2154 iput(inode); /* The delete magic happens here! */
2155 }
2156
2157 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2158
2159 if (nr_orphans)
2160 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2161 PLURAL(nr_orphans));
2162 if (nr_truncates)
2163 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2164 PLURAL(nr_truncates));
2165 #ifdef CONFIG_QUOTA
2166 /* Turn quotas off */
2167 for (i = 0; i < MAXQUOTAS; i++) {
2168 if (sb_dqopt(sb)->files[i])
2169 dquot_quota_off(sb, i);
2170 }
2171 #endif
2172 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2173 }
2174
2175 /*
2176 * Maximal extent format file size.
2177 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2178 * extent format containers, within a sector_t, and within i_blocks
2179 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2180 * so that won't be a limiting factor.
2181 *
2182 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2183 */
2184 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2185 {
2186 loff_t res;
2187 loff_t upper_limit = MAX_LFS_FILESIZE;
2188
2189 /* small i_blocks in vfs inode? */
2190 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2191 /*
2192 * CONFIG_LBDAF is not enabled implies the inode
2193 * i_block represent total blocks in 512 bytes
2194 * 32 == size of vfs inode i_blocks * 8
2195 */
2196 upper_limit = (1LL << 32) - 1;
2197
2198 /* total blocks in file system block size */
2199 upper_limit >>= (blkbits - 9);
2200 upper_limit <<= blkbits;
2201 }
2202
2203 /* 32-bit extent-start container, ee_block */
2204 res = 1LL << 32;
2205 res <<= blkbits;
2206 res -= 1;
2207
2208 /* Sanity check against vm- & vfs- imposed limits */
2209 if (res > upper_limit)
2210 res = upper_limit;
2211
2212 return res;
2213 }
2214
2215 /*
2216 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2217 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2218 * We need to be 1 filesystem block less than the 2^48 sector limit.
2219 */
2220 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2221 {
2222 loff_t res = EXT4_NDIR_BLOCKS;
2223 int meta_blocks;
2224 loff_t upper_limit;
2225 /* This is calculated to be the largest file size for a dense, block
2226 * mapped file such that the file's total number of 512-byte sectors,
2227 * including data and all indirect blocks, does not exceed (2^48 - 1).
2228 *
2229 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2230 * number of 512-byte sectors of the file.
2231 */
2232
2233 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2234 /*
2235 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2236 * the inode i_block field represents total file blocks in
2237 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2238 */
2239 upper_limit = (1LL << 32) - 1;
2240
2241 /* total blocks in file system block size */
2242 upper_limit >>= (bits - 9);
2243
2244 } else {
2245 /*
2246 * We use 48 bit ext4_inode i_blocks
2247 * With EXT4_HUGE_FILE_FL set the i_blocks
2248 * represent total number of blocks in
2249 * file system block size
2250 */
2251 upper_limit = (1LL << 48) - 1;
2252
2253 }
2254
2255 /* indirect blocks */
2256 meta_blocks = 1;
2257 /* double indirect blocks */
2258 meta_blocks += 1 + (1LL << (bits-2));
2259 /* tripple indirect blocks */
2260 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2261
2262 upper_limit -= meta_blocks;
2263 upper_limit <<= bits;
2264
2265 res += 1LL << (bits-2);
2266 res += 1LL << (2*(bits-2));
2267 res += 1LL << (3*(bits-2));
2268 res <<= bits;
2269 if (res > upper_limit)
2270 res = upper_limit;
2271
2272 if (res > MAX_LFS_FILESIZE)
2273 res = MAX_LFS_FILESIZE;
2274
2275 return res;
2276 }
2277
2278 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2279 ext4_fsblk_t logical_sb_block, int nr)
2280 {
2281 struct ext4_sb_info *sbi = EXT4_SB(sb);
2282 ext4_group_t bg, first_meta_bg;
2283 int has_super = 0;
2284
2285 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2286
2287 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2288 nr < first_meta_bg)
2289 return logical_sb_block + nr + 1;
2290 bg = sbi->s_desc_per_block * nr;
2291 if (ext4_bg_has_super(sb, bg))
2292 has_super = 1;
2293
2294 return (has_super + ext4_group_first_block_no(sb, bg));
2295 }
2296
2297 /**
2298 * ext4_get_stripe_size: Get the stripe size.
2299 * @sbi: In memory super block info
2300 *
2301 * If we have specified it via mount option, then
2302 * use the mount option value. If the value specified at mount time is
2303 * greater than the blocks per group use the super block value.
2304 * If the super block value is greater than blocks per group return 0.
2305 * Allocator needs it be less than blocks per group.
2306 *
2307 */
2308 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2309 {
2310 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2311 unsigned long stripe_width =
2312 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2313
2314 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2315 return sbi->s_stripe;
2316
2317 if (stripe_width <= sbi->s_blocks_per_group)
2318 return stripe_width;
2319
2320 if (stride <= sbi->s_blocks_per_group)
2321 return stride;
2322
2323 return 0;
2324 }
2325
2326 /* sysfs supprt */
2327
2328 struct ext4_attr {
2329 struct attribute attr;
2330 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2331 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2332 const char *, size_t);
2333 int offset;
2334 };
2335
2336 static int parse_strtoul(const char *buf,
2337 unsigned long max, unsigned long *value)
2338 {
2339 char *endp;
2340
2341 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2342 endp = skip_spaces(endp);
2343 if (*endp || *value > max)
2344 return -EINVAL;
2345
2346 return 0;
2347 }
2348
2349 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2350 struct ext4_sb_info *sbi,
2351 char *buf)
2352 {
2353 return snprintf(buf, PAGE_SIZE, "%llu\n",
2354 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2355 }
2356
2357 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2358 struct ext4_sb_info *sbi, char *buf)
2359 {
2360 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2361
2362 if (!sb->s_bdev->bd_part)
2363 return snprintf(buf, PAGE_SIZE, "0\n");
2364 return snprintf(buf, PAGE_SIZE, "%lu\n",
2365 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2366 sbi->s_sectors_written_start) >> 1);
2367 }
2368
2369 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2370 struct ext4_sb_info *sbi, char *buf)
2371 {
2372 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2373
2374 if (!sb->s_bdev->bd_part)
2375 return snprintf(buf, PAGE_SIZE, "0\n");
2376 return snprintf(buf, PAGE_SIZE, "%llu\n",
2377 (unsigned long long)(sbi->s_kbytes_written +
2378 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2379 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2380 }
2381
2382 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2383 struct ext4_sb_info *sbi,
2384 const char *buf, size_t count)
2385 {
2386 unsigned long t;
2387
2388 if (parse_strtoul(buf, 0x40000000, &t))
2389 return -EINVAL;
2390
2391 if (!is_power_of_2(t))
2392 return -EINVAL;
2393
2394 sbi->s_inode_readahead_blks = t;
2395 return count;
2396 }
2397
2398 static ssize_t sbi_ui_show(struct ext4_attr *a,
2399 struct ext4_sb_info *sbi, char *buf)
2400 {
2401 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2402
2403 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2404 }
2405
2406 static ssize_t sbi_ui_store(struct ext4_attr *a,
2407 struct ext4_sb_info *sbi,
2408 const char *buf, size_t count)
2409 {
2410 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2411 unsigned long t;
2412
2413 if (parse_strtoul(buf, 0xffffffff, &t))
2414 return -EINVAL;
2415 *ui = t;
2416 return count;
2417 }
2418
2419 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2420 static struct ext4_attr ext4_attr_##_name = { \
2421 .attr = {.name = __stringify(_name), .mode = _mode }, \
2422 .show = _show, \
2423 .store = _store, \
2424 .offset = offsetof(struct ext4_sb_info, _elname), \
2425 }
2426 #define EXT4_ATTR(name, mode, show, store) \
2427 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2428
2429 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2430 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2431 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2432 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2433 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2434 #define ATTR_LIST(name) &ext4_attr_##name.attr
2435
2436 EXT4_RO_ATTR(delayed_allocation_blocks);
2437 EXT4_RO_ATTR(session_write_kbytes);
2438 EXT4_RO_ATTR(lifetime_write_kbytes);
2439 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2440 inode_readahead_blks_store, s_inode_readahead_blks);
2441 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2442 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2443 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2444 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2445 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2446 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2447 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2448 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2449
2450 static struct attribute *ext4_attrs[] = {
2451 ATTR_LIST(delayed_allocation_blocks),
2452 ATTR_LIST(session_write_kbytes),
2453 ATTR_LIST(lifetime_write_kbytes),
2454 ATTR_LIST(inode_readahead_blks),
2455 ATTR_LIST(inode_goal),
2456 ATTR_LIST(mb_stats),
2457 ATTR_LIST(mb_max_to_scan),
2458 ATTR_LIST(mb_min_to_scan),
2459 ATTR_LIST(mb_order2_req),
2460 ATTR_LIST(mb_stream_req),
2461 ATTR_LIST(mb_group_prealloc),
2462 ATTR_LIST(max_writeback_mb_bump),
2463 NULL,
2464 };
2465
2466 /* Features this copy of ext4 supports */
2467 EXT4_INFO_ATTR(lazy_itable_init);
2468 EXT4_INFO_ATTR(batched_discard);
2469
2470 static struct attribute *ext4_feat_attrs[] = {
2471 ATTR_LIST(lazy_itable_init),
2472 ATTR_LIST(batched_discard),
2473 NULL,
2474 };
2475
2476 static ssize_t ext4_attr_show(struct kobject *kobj,
2477 struct attribute *attr, char *buf)
2478 {
2479 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2480 s_kobj);
2481 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2482
2483 return a->show ? a->show(a, sbi, buf) : 0;
2484 }
2485
2486 static ssize_t ext4_attr_store(struct kobject *kobj,
2487 struct attribute *attr,
2488 const char *buf, size_t len)
2489 {
2490 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2491 s_kobj);
2492 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2493
2494 return a->store ? a->store(a, sbi, buf, len) : 0;
2495 }
2496
2497 static void ext4_sb_release(struct kobject *kobj)
2498 {
2499 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2500 s_kobj);
2501 complete(&sbi->s_kobj_unregister);
2502 }
2503
2504 static const struct sysfs_ops ext4_attr_ops = {
2505 .show = ext4_attr_show,
2506 .store = ext4_attr_store,
2507 };
2508
2509 static struct kobj_type ext4_ktype = {
2510 .default_attrs = ext4_attrs,
2511 .sysfs_ops = &ext4_attr_ops,
2512 .release = ext4_sb_release,
2513 };
2514
2515 static void ext4_feat_release(struct kobject *kobj)
2516 {
2517 complete(&ext4_feat->f_kobj_unregister);
2518 }
2519
2520 static struct kobj_type ext4_feat_ktype = {
2521 .default_attrs = ext4_feat_attrs,
2522 .sysfs_ops = &ext4_attr_ops,
2523 .release = ext4_feat_release,
2524 };
2525
2526 /*
2527 * Check whether this filesystem can be mounted based on
2528 * the features present and the RDONLY/RDWR mount requested.
2529 * Returns 1 if this filesystem can be mounted as requested,
2530 * 0 if it cannot be.
2531 */
2532 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2533 {
2534 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2535 ext4_msg(sb, KERN_ERR,
2536 "Couldn't mount because of "
2537 "unsupported optional features (%x)",
2538 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2539 ~EXT4_FEATURE_INCOMPAT_SUPP));
2540 return 0;
2541 }
2542
2543 if (readonly)
2544 return 1;
2545
2546 /* Check that feature set is OK for a read-write mount */
2547 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2548 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2549 "unsupported optional features (%x)",
2550 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2551 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2552 return 0;
2553 }
2554 /*
2555 * Large file size enabled file system can only be mounted
2556 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2557 */
2558 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2559 if (sizeof(blkcnt_t) < sizeof(u64)) {
2560 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2561 "cannot be mounted RDWR without "
2562 "CONFIG_LBDAF");
2563 return 0;
2564 }
2565 }
2566 return 1;
2567 }
2568
2569 /*
2570 * This function is called once a day if we have errors logged
2571 * on the file system
2572 */
2573 static void print_daily_error_info(unsigned long arg)
2574 {
2575 struct super_block *sb = (struct super_block *) arg;
2576 struct ext4_sb_info *sbi;
2577 struct ext4_super_block *es;
2578
2579 sbi = EXT4_SB(sb);
2580 es = sbi->s_es;
2581
2582 if (es->s_error_count)
2583 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2584 le32_to_cpu(es->s_error_count));
2585 if (es->s_first_error_time) {
2586 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2587 sb->s_id, le32_to_cpu(es->s_first_error_time),
2588 (int) sizeof(es->s_first_error_func),
2589 es->s_first_error_func,
2590 le32_to_cpu(es->s_first_error_line));
2591 if (es->s_first_error_ino)
2592 printk(": inode %u",
2593 le32_to_cpu(es->s_first_error_ino));
2594 if (es->s_first_error_block)
2595 printk(": block %llu", (unsigned long long)
2596 le64_to_cpu(es->s_first_error_block));
2597 printk("\n");
2598 }
2599 if (es->s_last_error_time) {
2600 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2601 sb->s_id, le32_to_cpu(es->s_last_error_time),
2602 (int) sizeof(es->s_last_error_func),
2603 es->s_last_error_func,
2604 le32_to_cpu(es->s_last_error_line));
2605 if (es->s_last_error_ino)
2606 printk(": inode %u",
2607 le32_to_cpu(es->s_last_error_ino));
2608 if (es->s_last_error_block)
2609 printk(": block %llu", (unsigned long long)
2610 le64_to_cpu(es->s_last_error_block));
2611 printk("\n");
2612 }
2613 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2614 }
2615
2616 static void ext4_lazyinode_timeout(unsigned long data)
2617 {
2618 struct task_struct *p = (struct task_struct *)data;
2619 wake_up_process(p);
2620 }
2621
2622 /* Find next suitable group and run ext4_init_inode_table */
2623 static int ext4_run_li_request(struct ext4_li_request *elr)
2624 {
2625 struct ext4_group_desc *gdp = NULL;
2626 ext4_group_t group, ngroups;
2627 struct super_block *sb;
2628 unsigned long timeout = 0;
2629 int ret = 0;
2630
2631 sb = elr->lr_super;
2632 ngroups = EXT4_SB(sb)->s_groups_count;
2633
2634 for (group = elr->lr_next_group; group < ngroups; group++) {
2635 gdp = ext4_get_group_desc(sb, group, NULL);
2636 if (!gdp) {
2637 ret = 1;
2638 break;
2639 }
2640
2641 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2642 break;
2643 }
2644
2645 if (group == ngroups)
2646 ret = 1;
2647
2648 if (!ret) {
2649 timeout = jiffies;
2650 ret = ext4_init_inode_table(sb, group,
2651 elr->lr_timeout ? 0 : 1);
2652 if (elr->lr_timeout == 0) {
2653 timeout = jiffies - timeout;
2654 if (elr->lr_sbi->s_li_wait_mult)
2655 timeout *= elr->lr_sbi->s_li_wait_mult;
2656 else
2657 timeout *= 20;
2658 elr->lr_timeout = timeout;
2659 }
2660 elr->lr_next_sched = jiffies + elr->lr_timeout;
2661 elr->lr_next_group = group + 1;
2662 }
2663
2664 return ret;
2665 }
2666
2667 /*
2668 * Remove lr_request from the list_request and free the
2669 * request tructure. Should be called with li_list_mtx held
2670 */
2671 static void ext4_remove_li_request(struct ext4_li_request *elr)
2672 {
2673 struct ext4_sb_info *sbi;
2674
2675 if (!elr)
2676 return;
2677
2678 sbi = elr->lr_sbi;
2679
2680 list_del(&elr->lr_request);
2681 sbi->s_li_request = NULL;
2682 kfree(elr);
2683 }
2684
2685 static void ext4_unregister_li_request(struct super_block *sb)
2686 {
2687 struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request;
2688
2689 if (!ext4_li_info)
2690 return;
2691
2692 mutex_lock(&ext4_li_info->li_list_mtx);
2693 ext4_remove_li_request(elr);
2694 mutex_unlock(&ext4_li_info->li_list_mtx);
2695 }
2696
2697 /*
2698 * This is the function where ext4lazyinit thread lives. It walks
2699 * through the request list searching for next scheduled filesystem.
2700 * When such a fs is found, run the lazy initialization request
2701 * (ext4_rn_li_request) and keep track of the time spend in this
2702 * function. Based on that time we compute next schedule time of
2703 * the request. When walking through the list is complete, compute
2704 * next waking time and put itself into sleep.
2705 */
2706 static int ext4_lazyinit_thread(void *arg)
2707 {
2708 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2709 struct list_head *pos, *n;
2710 struct ext4_li_request *elr;
2711 unsigned long next_wakeup;
2712 DEFINE_WAIT(wait);
2713
2714 BUG_ON(NULL == eli);
2715
2716 eli->li_timer.data = (unsigned long)current;
2717 eli->li_timer.function = ext4_lazyinode_timeout;
2718
2719 eli->li_task = current;
2720 wake_up(&eli->li_wait_task);
2721
2722 cont_thread:
2723 while (true) {
2724 next_wakeup = MAX_JIFFY_OFFSET;
2725
2726 mutex_lock(&eli->li_list_mtx);
2727 if (list_empty(&eli->li_request_list)) {
2728 mutex_unlock(&eli->li_list_mtx);
2729 goto exit_thread;
2730 }
2731
2732 list_for_each_safe(pos, n, &eli->li_request_list) {
2733 elr = list_entry(pos, struct ext4_li_request,
2734 lr_request);
2735
2736 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2737 if (ext4_run_li_request(elr) != 0) {
2738 /* error, remove the lazy_init job */
2739 ext4_remove_li_request(elr);
2740 continue;
2741 }
2742 }
2743
2744 if (time_before(elr->lr_next_sched, next_wakeup))
2745 next_wakeup = elr->lr_next_sched;
2746 }
2747 mutex_unlock(&eli->li_list_mtx);
2748
2749 if (freezing(current))
2750 refrigerator();
2751
2752 if ((time_after_eq(jiffies, next_wakeup)) ||
2753 (MAX_JIFFY_OFFSET == next_wakeup)) {
2754 cond_resched();
2755 continue;
2756 }
2757
2758 eli->li_timer.expires = next_wakeup;
2759 add_timer(&eli->li_timer);
2760 prepare_to_wait(&eli->li_wait_daemon, &wait,
2761 TASK_INTERRUPTIBLE);
2762 if (time_before(jiffies, next_wakeup))
2763 schedule();
2764 finish_wait(&eli->li_wait_daemon, &wait);
2765 }
2766
2767 exit_thread:
2768 /*
2769 * It looks like the request list is empty, but we need
2770 * to check it under the li_list_mtx lock, to prevent any
2771 * additions into it, and of course we should lock ext4_li_mtx
2772 * to atomically free the list and ext4_li_info, because at
2773 * this point another ext4 filesystem could be registering
2774 * new one.
2775 */
2776 mutex_lock(&ext4_li_mtx);
2777 mutex_lock(&eli->li_list_mtx);
2778 if (!list_empty(&eli->li_request_list)) {
2779 mutex_unlock(&eli->li_list_mtx);
2780 mutex_unlock(&ext4_li_mtx);
2781 goto cont_thread;
2782 }
2783 mutex_unlock(&eli->li_list_mtx);
2784 del_timer_sync(&ext4_li_info->li_timer);
2785 eli->li_task = NULL;
2786 wake_up(&eli->li_wait_task);
2787
2788 kfree(ext4_li_info);
2789 ext4_li_info = NULL;
2790 mutex_unlock(&ext4_li_mtx);
2791
2792 return 0;
2793 }
2794
2795 static void ext4_clear_request_list(void)
2796 {
2797 struct list_head *pos, *n;
2798 struct ext4_li_request *elr;
2799
2800 mutex_lock(&ext4_li_info->li_list_mtx);
2801 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2802 elr = list_entry(pos, struct ext4_li_request,
2803 lr_request);
2804 ext4_remove_li_request(elr);
2805 }
2806 mutex_unlock(&ext4_li_info->li_list_mtx);
2807 }
2808
2809 static int ext4_run_lazyinit_thread(void)
2810 {
2811 struct task_struct *t;
2812
2813 t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
2814 if (IS_ERR(t)) {
2815 int err = PTR_ERR(t);
2816 ext4_clear_request_list();
2817 del_timer_sync(&ext4_li_info->li_timer);
2818 kfree(ext4_li_info);
2819 ext4_li_info = NULL;
2820 printk(KERN_CRIT "EXT4: error %d creating inode table "
2821 "initialization thread\n",
2822 err);
2823 return err;
2824 }
2825 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2826
2827 wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL);
2828 return 0;
2829 }
2830
2831 /*
2832 * Check whether it make sense to run itable init. thread or not.
2833 * If there is at least one uninitialized inode table, return
2834 * corresponding group number, else the loop goes through all
2835 * groups and return total number of groups.
2836 */
2837 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2838 {
2839 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2840 struct ext4_group_desc *gdp = NULL;
2841
2842 for (group = 0; group < ngroups; group++) {
2843 gdp = ext4_get_group_desc(sb, group, NULL);
2844 if (!gdp)
2845 continue;
2846
2847 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2848 break;
2849 }
2850
2851 return group;
2852 }
2853
2854 static int ext4_li_info_new(void)
2855 {
2856 struct ext4_lazy_init *eli = NULL;
2857
2858 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2859 if (!eli)
2860 return -ENOMEM;
2861
2862 eli->li_task = NULL;
2863 INIT_LIST_HEAD(&eli->li_request_list);
2864 mutex_init(&eli->li_list_mtx);
2865
2866 init_waitqueue_head(&eli->li_wait_daemon);
2867 init_waitqueue_head(&eli->li_wait_task);
2868 init_timer(&eli->li_timer);
2869 eli->li_state |= EXT4_LAZYINIT_QUIT;
2870
2871 ext4_li_info = eli;
2872
2873 return 0;
2874 }
2875
2876 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2877 ext4_group_t start)
2878 {
2879 struct ext4_sb_info *sbi = EXT4_SB(sb);
2880 struct ext4_li_request *elr;
2881 unsigned long rnd;
2882
2883 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2884 if (!elr)
2885 return NULL;
2886
2887 elr->lr_super = sb;
2888 elr->lr_sbi = sbi;
2889 elr->lr_next_group = start;
2890
2891 /*
2892 * Randomize first schedule time of the request to
2893 * spread the inode table initialization requests
2894 * better.
2895 */
2896 get_random_bytes(&rnd, sizeof(rnd));
2897 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2898 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2899
2900 return elr;
2901 }
2902
2903 static int ext4_register_li_request(struct super_block *sb,
2904 ext4_group_t first_not_zeroed)
2905 {
2906 struct ext4_sb_info *sbi = EXT4_SB(sb);
2907 struct ext4_li_request *elr;
2908 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2909 int ret;
2910
2911 if (sbi->s_li_request != NULL)
2912 return 0;
2913
2914 if (first_not_zeroed == ngroups ||
2915 (sb->s_flags & MS_RDONLY) ||
2916 !test_opt(sb, INIT_INODE_TABLE)) {
2917 sbi->s_li_request = NULL;
2918 return 0;
2919 }
2920
2921 if (first_not_zeroed == ngroups) {
2922 sbi->s_li_request = NULL;
2923 return 0;
2924 }
2925
2926 elr = ext4_li_request_new(sb, first_not_zeroed);
2927 if (!elr)
2928 return -ENOMEM;
2929
2930 mutex_lock(&ext4_li_mtx);
2931
2932 if (NULL == ext4_li_info) {
2933 ret = ext4_li_info_new();
2934 if (ret)
2935 goto out;
2936 }
2937
2938 mutex_lock(&ext4_li_info->li_list_mtx);
2939 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2940 mutex_unlock(&ext4_li_info->li_list_mtx);
2941
2942 sbi->s_li_request = elr;
2943
2944 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2945 ret = ext4_run_lazyinit_thread();
2946 if (ret)
2947 goto out;
2948 }
2949 out:
2950 mutex_unlock(&ext4_li_mtx);
2951 if (ret)
2952 kfree(elr);
2953 return ret;
2954 }
2955
2956 /*
2957 * We do not need to lock anything since this is called on
2958 * module unload.
2959 */
2960 static void ext4_destroy_lazyinit_thread(void)
2961 {
2962 /*
2963 * If thread exited earlier
2964 * there's nothing to be done.
2965 */
2966 if (!ext4_li_info)
2967 return;
2968
2969 ext4_clear_request_list();
2970
2971 while (ext4_li_info->li_task) {
2972 wake_up(&ext4_li_info->li_wait_daemon);
2973 wait_event(ext4_li_info->li_wait_task,
2974 ext4_li_info->li_task == NULL);
2975 }
2976 }
2977
2978 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2979 __releases(kernel_lock)
2980 __acquires(kernel_lock)
2981 {
2982 char *orig_data = kstrdup(data, GFP_KERNEL);
2983 struct buffer_head *bh;
2984 struct ext4_super_block *es = NULL;
2985 struct ext4_sb_info *sbi;
2986 ext4_fsblk_t block;
2987 ext4_fsblk_t sb_block = get_sb_block(&data);
2988 ext4_fsblk_t logical_sb_block;
2989 unsigned long offset = 0;
2990 unsigned long journal_devnum = 0;
2991 unsigned long def_mount_opts;
2992 struct inode *root;
2993 char *cp;
2994 const char *descr;
2995 int ret = -ENOMEM;
2996 int blocksize;
2997 unsigned int db_count;
2998 unsigned int i;
2999 int needs_recovery, has_huge_files;
3000 __u64 blocks_count;
3001 int err;
3002 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3003 ext4_group_t first_not_zeroed;
3004
3005 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3006 if (!sbi)
3007 goto out_free_orig;
3008
3009 sbi->s_blockgroup_lock =
3010 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3011 if (!sbi->s_blockgroup_lock) {
3012 kfree(sbi);
3013 goto out_free_orig;
3014 }
3015 sb->s_fs_info = sbi;
3016 sbi->s_mount_opt = 0;
3017 sbi->s_resuid = EXT4_DEF_RESUID;
3018 sbi->s_resgid = EXT4_DEF_RESGID;
3019 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3020 sbi->s_sb_block = sb_block;
3021 if (sb->s_bdev->bd_part)
3022 sbi->s_sectors_written_start =
3023 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3024
3025 /* Cleanup superblock name */
3026 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3027 *cp = '!';
3028
3029 ret = -EINVAL;
3030 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3031 if (!blocksize) {
3032 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3033 goto out_fail;
3034 }
3035
3036 /*
3037 * The ext4 superblock will not be buffer aligned for other than 1kB
3038 * block sizes. We need to calculate the offset from buffer start.
3039 */
3040 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3041 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3042 offset = do_div(logical_sb_block, blocksize);
3043 } else {
3044 logical_sb_block = sb_block;
3045 }
3046
3047 if (!(bh = sb_bread(sb, logical_sb_block))) {
3048 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3049 goto out_fail;
3050 }
3051 /*
3052 * Note: s_es must be initialized as soon as possible because
3053 * some ext4 macro-instructions depend on its value
3054 */
3055 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3056 sbi->s_es = es;
3057 sb->s_magic = le16_to_cpu(es->s_magic);
3058 if (sb->s_magic != EXT4_SUPER_MAGIC)
3059 goto cantfind_ext4;
3060 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3061
3062 /* Set defaults before we parse the mount options */
3063 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3064 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
3065 if (def_mount_opts & EXT4_DEFM_DEBUG)
3066 set_opt(sbi->s_mount_opt, DEBUG);
3067 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3068 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3069 "2.6.38");
3070 set_opt(sbi->s_mount_opt, GRPID);
3071 }
3072 if (def_mount_opts & EXT4_DEFM_UID16)
3073 set_opt(sbi->s_mount_opt, NO_UID32);
3074 #ifdef CONFIG_EXT4_FS_XATTR
3075 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
3076 set_opt(sbi->s_mount_opt, XATTR_USER);
3077 #endif
3078 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3079 if (def_mount_opts & EXT4_DEFM_ACL)
3080 set_opt(sbi->s_mount_opt, POSIX_ACL);
3081 #endif
3082 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3083 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3084 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3085 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3086 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3087 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3088
3089 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3090 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
3091 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3092 set_opt(sbi->s_mount_opt, ERRORS_CONT);
3093 else
3094 set_opt(sbi->s_mount_opt, ERRORS_RO);
3095 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3096 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
3097 if (def_mount_opts & EXT4_DEFM_DISCARD)
3098 set_opt(sbi->s_mount_opt, DISCARD);
3099
3100 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3101 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3102 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3103 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3104 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3105
3106 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3107 set_opt(sbi->s_mount_opt, BARRIER);
3108
3109 /*
3110 * enable delayed allocation by default
3111 * Use -o nodelalloc to turn it off
3112 */
3113 if (!IS_EXT3_SB(sb) &&
3114 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3115 set_opt(sbi->s_mount_opt, DELALLOC);
3116
3117 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3118 &journal_devnum, &journal_ioprio, NULL, 0)) {
3119 ext4_msg(sb, KERN_WARNING,
3120 "failed to parse options in superblock: %s",
3121 sbi->s_es->s_mount_opts);
3122 }
3123 if (!parse_options((char *) data, sb, &journal_devnum,
3124 &journal_ioprio, NULL, 0))
3125 goto failed_mount;
3126
3127 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3128 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3129
3130 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3131 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3132 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3133 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3134 ext4_msg(sb, KERN_WARNING,
3135 "feature flags set on rev 0 fs, "
3136 "running e2fsck is recommended");
3137
3138 /*
3139 * Check feature flags regardless of the revision level, since we
3140 * previously didn't change the revision level when setting the flags,
3141 * so there is a chance incompat flags are set on a rev 0 filesystem.
3142 */
3143 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3144 goto failed_mount;
3145
3146 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3147
3148 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3149 blocksize > EXT4_MAX_BLOCK_SIZE) {
3150 ext4_msg(sb, KERN_ERR,
3151 "Unsupported filesystem blocksize %d", blocksize);
3152 goto failed_mount;
3153 }
3154
3155 if (sb->s_blocksize != blocksize) {
3156 /* Validate the filesystem blocksize */
3157 if (!sb_set_blocksize(sb, blocksize)) {
3158 ext4_msg(sb, KERN_ERR, "bad block size %d",
3159 blocksize);
3160 goto failed_mount;
3161 }
3162
3163 brelse(bh);
3164 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3165 offset = do_div(logical_sb_block, blocksize);
3166 bh = sb_bread(sb, logical_sb_block);
3167 if (!bh) {
3168 ext4_msg(sb, KERN_ERR,
3169 "Can't read superblock on 2nd try");
3170 goto failed_mount;
3171 }
3172 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3173 sbi->s_es = es;
3174 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3175 ext4_msg(sb, KERN_ERR,
3176 "Magic mismatch, very weird!");
3177 goto failed_mount;
3178 }
3179 }
3180
3181 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3182 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3183 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3184 has_huge_files);
3185 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3186
3187 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3188 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3189 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3190 } else {
3191 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3192 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3193 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3194 (!is_power_of_2(sbi->s_inode_size)) ||
3195 (sbi->s_inode_size > blocksize)) {
3196 ext4_msg(sb, KERN_ERR,
3197 "unsupported inode size: %d",
3198 sbi->s_inode_size);
3199 goto failed_mount;
3200 }
3201 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3202 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3203 }
3204
3205 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3206 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3207 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3208 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3209 !is_power_of_2(sbi->s_desc_size)) {
3210 ext4_msg(sb, KERN_ERR,
3211 "unsupported descriptor size %lu",
3212 sbi->s_desc_size);
3213 goto failed_mount;
3214 }
3215 } else
3216 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3217
3218 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3219 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3220 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3221 goto cantfind_ext4;
3222
3223 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3224 if (sbi->s_inodes_per_block == 0)
3225 goto cantfind_ext4;
3226 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3227 sbi->s_inodes_per_block;
3228 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3229 sbi->s_sbh = bh;
3230 sbi->s_mount_state = le16_to_cpu(es->s_state);
3231 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3232 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3233
3234 for (i = 0; i < 4; i++)
3235 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3236 sbi->s_def_hash_version = es->s_def_hash_version;
3237 i = le32_to_cpu(es->s_flags);
3238 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3239 sbi->s_hash_unsigned = 3;
3240 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3241 #ifdef __CHAR_UNSIGNED__
3242 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3243 sbi->s_hash_unsigned = 3;
3244 #else
3245 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3246 #endif
3247 sb->s_dirt = 1;
3248 }
3249
3250 if (sbi->s_blocks_per_group > blocksize * 8) {
3251 ext4_msg(sb, KERN_ERR,
3252 "#blocks per group too big: %lu",
3253 sbi->s_blocks_per_group);
3254 goto failed_mount;
3255 }
3256 if (sbi->s_inodes_per_group > blocksize * 8) {
3257 ext4_msg(sb, KERN_ERR,
3258 "#inodes per group too big: %lu",
3259 sbi->s_inodes_per_group);
3260 goto failed_mount;
3261 }
3262
3263 /*
3264 * Test whether we have more sectors than will fit in sector_t,
3265 * and whether the max offset is addressable by the page cache.
3266 */
3267 err = generic_check_addressable(sb->s_blocksize_bits,
3268 ext4_blocks_count(es));
3269 if (err) {
3270 ext4_msg(sb, KERN_ERR, "filesystem"
3271 " too large to mount safely on this system");
3272 if (sizeof(sector_t) < 8)
3273 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3274 ret = err;
3275 goto failed_mount;
3276 }
3277
3278 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3279 goto cantfind_ext4;
3280
3281 /* check blocks count against device size */
3282 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3283 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3284 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3285 "exceeds size of device (%llu blocks)",
3286 ext4_blocks_count(es), blocks_count);
3287 goto failed_mount;
3288 }
3289
3290 /*
3291 * It makes no sense for the first data block to be beyond the end
3292 * of the filesystem.
3293 */
3294 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3295 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3296 "block %u is beyond end of filesystem (%llu)",
3297 le32_to_cpu(es->s_first_data_block),
3298 ext4_blocks_count(es));
3299 goto failed_mount;
3300 }
3301 blocks_count = (ext4_blocks_count(es) -
3302 le32_to_cpu(es->s_first_data_block) +
3303 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3304 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3305 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3306 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3307 "(block count %llu, first data block %u, "
3308 "blocks per group %lu)", sbi->s_groups_count,
3309 ext4_blocks_count(es),
3310 le32_to_cpu(es->s_first_data_block),
3311 EXT4_BLOCKS_PER_GROUP(sb));
3312 goto failed_mount;
3313 }
3314 sbi->s_groups_count = blocks_count;
3315 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3316 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3317 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3318 EXT4_DESC_PER_BLOCK(sb);
3319 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
3320 GFP_KERNEL);
3321 if (sbi->s_group_desc == NULL) {
3322 ext4_msg(sb, KERN_ERR, "not enough memory");
3323 goto failed_mount;
3324 }
3325
3326 #ifdef CONFIG_PROC_FS
3327 if (ext4_proc_root)
3328 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3329 #endif
3330
3331 bgl_lock_init(sbi->s_blockgroup_lock);
3332
3333 for (i = 0; i < db_count; i++) {
3334 block = descriptor_loc(sb, logical_sb_block, i);
3335 sbi->s_group_desc[i] = sb_bread(sb, block);
3336 if (!sbi->s_group_desc[i]) {
3337 ext4_msg(sb, KERN_ERR,
3338 "can't read group descriptor %d", i);
3339 db_count = i;
3340 goto failed_mount2;
3341 }
3342 }
3343 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3344 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3345 goto failed_mount2;
3346 }
3347 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3348 if (!ext4_fill_flex_info(sb)) {
3349 ext4_msg(sb, KERN_ERR,
3350 "unable to initialize "
3351 "flex_bg meta info!");
3352 goto failed_mount2;
3353 }
3354
3355 sbi->s_gdb_count = db_count;
3356 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3357 spin_lock_init(&sbi->s_next_gen_lock);
3358
3359 err = percpu_counter_init(&sbi->s_freeblocks_counter,
3360 ext4_count_free_blocks(sb));
3361 if (!err) {
3362 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3363 ext4_count_free_inodes(sb));
3364 }
3365 if (!err) {
3366 err = percpu_counter_init(&sbi->s_dirs_counter,
3367 ext4_count_dirs(sb));
3368 }
3369 if (!err) {
3370 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3371 }
3372 if (err) {
3373 ext4_msg(sb, KERN_ERR, "insufficient memory");
3374 goto failed_mount3;
3375 }
3376
3377 sbi->s_stripe = ext4_get_stripe_size(sbi);
3378 sbi->s_max_writeback_mb_bump = 128;
3379
3380 /*
3381 * set up enough so that it can read an inode
3382 */
3383 if (!test_opt(sb, NOLOAD) &&
3384 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3385 sb->s_op = &ext4_sops;
3386 else
3387 sb->s_op = &ext4_nojournal_sops;
3388 sb->s_export_op = &ext4_export_ops;
3389 sb->s_xattr = ext4_xattr_handlers;
3390 #ifdef CONFIG_QUOTA
3391 sb->s_qcop = &ext4_qctl_operations;
3392 sb->dq_op = &ext4_quota_operations;
3393 #endif
3394 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3395 mutex_init(&sbi->s_orphan_lock);
3396 mutex_init(&sbi->s_resize_lock);
3397
3398 sb->s_root = NULL;
3399
3400 needs_recovery = (es->s_last_orphan != 0 ||
3401 EXT4_HAS_INCOMPAT_FEATURE(sb,
3402 EXT4_FEATURE_INCOMPAT_RECOVER));
3403
3404 /*
3405 * The first inode we look at is the journal inode. Don't try
3406 * root first: it may be modified in the journal!
3407 */
3408 if (!test_opt(sb, NOLOAD) &&
3409 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3410 if (ext4_load_journal(sb, es, journal_devnum))
3411 goto failed_mount3;
3412 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3413 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3414 ext4_msg(sb, KERN_ERR, "required journal recovery "
3415 "suppressed and not mounted read-only");
3416 goto failed_mount_wq;
3417 } else {
3418 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
3419 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3420 sbi->s_journal = NULL;
3421 needs_recovery = 0;
3422 goto no_journal;
3423 }
3424
3425 if (ext4_blocks_count(es) > 0xffffffffULL &&
3426 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3427 JBD2_FEATURE_INCOMPAT_64BIT)) {
3428 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3429 goto failed_mount_wq;
3430 }
3431
3432 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3433 jbd2_journal_set_features(sbi->s_journal,
3434 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3435 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3436 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3437 jbd2_journal_set_features(sbi->s_journal,
3438 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3439 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3440 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3441 } else {
3442 jbd2_journal_clear_features(sbi->s_journal,
3443 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3444 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3445 }
3446
3447 /* We have now updated the journal if required, so we can
3448 * validate the data journaling mode. */
3449 switch (test_opt(sb, DATA_FLAGS)) {
3450 case 0:
3451 /* No mode set, assume a default based on the journal
3452 * capabilities: ORDERED_DATA if the journal can
3453 * cope, else JOURNAL_DATA
3454 */
3455 if (jbd2_journal_check_available_features
3456 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3457 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3458 else
3459 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3460 break;
3461
3462 case EXT4_MOUNT_ORDERED_DATA:
3463 case EXT4_MOUNT_WRITEBACK_DATA:
3464 if (!jbd2_journal_check_available_features
3465 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3466 ext4_msg(sb, KERN_ERR, "Journal does not support "
3467 "requested data journaling mode");
3468 goto failed_mount_wq;
3469 }
3470 default:
3471 break;
3472 }
3473 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3474
3475 /*
3476 * The journal may have updated the bg summary counts, so we
3477 * need to update the global counters.
3478 */
3479 percpu_counter_set(&sbi->s_freeblocks_counter,
3480 ext4_count_free_blocks(sb));
3481 percpu_counter_set(&sbi->s_freeinodes_counter,
3482 ext4_count_free_inodes(sb));
3483 percpu_counter_set(&sbi->s_dirs_counter,
3484 ext4_count_dirs(sb));
3485 percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
3486
3487 no_journal:
3488 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
3489 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3490 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3491 goto failed_mount_wq;
3492 }
3493
3494 /*
3495 * The jbd2_journal_load will have done any necessary log recovery,
3496 * so we can safely mount the rest of the filesystem now.
3497 */
3498
3499 root = ext4_iget(sb, EXT4_ROOT_INO);
3500 if (IS_ERR(root)) {
3501 ext4_msg(sb, KERN_ERR, "get root inode failed");
3502 ret = PTR_ERR(root);
3503 goto failed_mount4;
3504 }
3505 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3506 iput(root);
3507 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3508 goto failed_mount4;
3509 }
3510 sb->s_root = d_alloc_root(root);
3511 if (!sb->s_root) {
3512 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3513 iput(root);
3514 ret = -ENOMEM;
3515 goto failed_mount4;
3516 }
3517
3518 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3519
3520 /* determine the minimum size of new large inodes, if present */
3521 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3522 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3523 EXT4_GOOD_OLD_INODE_SIZE;
3524 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3525 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3526 if (sbi->s_want_extra_isize <
3527 le16_to_cpu(es->s_want_extra_isize))
3528 sbi->s_want_extra_isize =
3529 le16_to_cpu(es->s_want_extra_isize);
3530 if (sbi->s_want_extra_isize <
3531 le16_to_cpu(es->s_min_extra_isize))
3532 sbi->s_want_extra_isize =
3533 le16_to_cpu(es->s_min_extra_isize);
3534 }
3535 }
3536 /* Check if enough inode space is available */
3537 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3538 sbi->s_inode_size) {
3539 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3540 EXT4_GOOD_OLD_INODE_SIZE;
3541 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3542 "available");
3543 }
3544
3545 if (test_opt(sb, DELALLOC) &&
3546 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
3547 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3548 "requested data journaling mode");
3549 clear_opt(sbi->s_mount_opt, DELALLOC);
3550 }
3551 if (test_opt(sb, DIOREAD_NOLOCK)) {
3552 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3553 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3554 "option - requested data journaling mode");
3555 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3556 }
3557 if (sb->s_blocksize < PAGE_SIZE) {
3558 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3559 "option - block size is too small");
3560 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3561 }
3562 }
3563
3564 err = ext4_setup_system_zone(sb);
3565 if (err) {
3566 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3567 "zone (%d)", err);
3568 goto failed_mount4;
3569 }
3570
3571 ext4_ext_init(sb);
3572 err = ext4_mb_init(sb, needs_recovery);
3573 if (err) {
3574 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3575 err);
3576 goto failed_mount4;
3577 }
3578
3579 err = ext4_register_li_request(sb, first_not_zeroed);
3580 if (err)
3581 goto failed_mount4;
3582
3583 sbi->s_kobj.kset = ext4_kset;
3584 init_completion(&sbi->s_kobj_unregister);
3585 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3586 "%s", sb->s_id);
3587 if (err) {
3588 ext4_mb_release(sb);
3589 ext4_ext_release(sb);
3590 goto failed_mount4;
3591 };
3592
3593 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3594 ext4_orphan_cleanup(sb, es);
3595 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3596 if (needs_recovery) {
3597 ext4_msg(sb, KERN_INFO, "recovery complete");
3598 ext4_mark_recovery_complete(sb, es);
3599 }
3600 if (EXT4_SB(sb)->s_journal) {
3601 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3602 descr = " journalled data mode";
3603 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3604 descr = " ordered data mode";
3605 else
3606 descr = " writeback data mode";
3607 } else
3608 descr = "out journal";
3609
3610 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3611 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3612 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3613
3614 init_timer(&sbi->s_err_report);
3615 sbi->s_err_report.function = print_daily_error_info;
3616 sbi->s_err_report.data = (unsigned long) sb;
3617 if (es->s_error_count)
3618 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3619
3620 kfree(orig_data);
3621 return 0;
3622
3623 cantfind_ext4:
3624 if (!silent)
3625 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3626 goto failed_mount;
3627
3628 failed_mount4:
3629 ext4_msg(sb, KERN_ERR, "mount failed");
3630 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3631 failed_mount_wq:
3632 ext4_release_system_zone(sb);
3633 if (sbi->s_journal) {
3634 jbd2_journal_destroy(sbi->s_journal);
3635 sbi->s_journal = NULL;
3636 }
3637 failed_mount3:
3638 if (sbi->s_flex_groups) {
3639 if (is_vmalloc_addr(sbi->s_flex_groups))
3640 vfree(sbi->s_flex_groups);
3641 else
3642 kfree(sbi->s_flex_groups);
3643 }
3644 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3645 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3646 percpu_counter_destroy(&sbi->s_dirs_counter);
3647 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
3648 failed_mount2:
3649 for (i = 0; i < db_count; i++)
3650 brelse(sbi->s_group_desc[i]);
3651 kfree(sbi->s_group_desc);
3652 failed_mount:
3653 if (sbi->s_proc) {
3654 remove_proc_entry(sb->s_id, ext4_proc_root);
3655 }
3656 #ifdef CONFIG_QUOTA
3657 for (i = 0; i < MAXQUOTAS; i++)
3658 kfree(sbi->s_qf_names[i]);
3659 #endif
3660 ext4_blkdev_remove(sbi);
3661 brelse(bh);
3662 out_fail:
3663 sb->s_fs_info = NULL;
3664 kfree(sbi->s_blockgroup_lock);
3665 kfree(sbi);
3666 out_free_orig:
3667 kfree(orig_data);
3668 return ret;
3669 }
3670
3671 /*
3672 * Setup any per-fs journal parameters now. We'll do this both on
3673 * initial mount, once the journal has been initialised but before we've
3674 * done any recovery; and again on any subsequent remount.
3675 */
3676 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3677 {
3678 struct ext4_sb_info *sbi = EXT4_SB(sb);
3679
3680 journal->j_commit_interval = sbi->s_commit_interval;
3681 journal->j_min_batch_time = sbi->s_min_batch_time;
3682 journal->j_max_batch_time = sbi->s_max_batch_time;
3683
3684 write_lock(&journal->j_state_lock);
3685 if (test_opt(sb, BARRIER))
3686 journal->j_flags |= JBD2_BARRIER;
3687 else
3688 journal->j_flags &= ~JBD2_BARRIER;
3689 if (test_opt(sb, DATA_ERR_ABORT))
3690 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3691 else
3692 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3693 write_unlock(&journal->j_state_lock);
3694 }
3695
3696 static journal_t *ext4_get_journal(struct super_block *sb,
3697 unsigned int journal_inum)
3698 {
3699 struct inode *journal_inode;
3700 journal_t *journal;
3701
3702 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3703
3704 /* First, test for the existence of a valid inode on disk. Bad
3705 * things happen if we iget() an unused inode, as the subsequent
3706 * iput() will try to delete it. */
3707
3708 journal_inode = ext4_iget(sb, journal_inum);
3709 if (IS_ERR(journal_inode)) {
3710 ext4_msg(sb, KERN_ERR, "no journal found");
3711 return NULL;
3712 }
3713 if (!journal_inode->i_nlink) {
3714 make_bad_inode(journal_inode);
3715 iput(journal_inode);
3716 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3717 return NULL;
3718 }
3719
3720 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3721 journal_inode, journal_inode->i_size);
3722 if (!S_ISREG(journal_inode->i_mode)) {
3723 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3724 iput(journal_inode);
3725 return NULL;
3726 }
3727
3728 journal = jbd2_journal_init_inode(journal_inode);
3729 if (!journal) {
3730 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3731 iput(journal_inode);
3732 return NULL;
3733 }
3734 journal->j_private = sb;
3735 ext4_init_journal_params(sb, journal);
3736 return journal;
3737 }
3738
3739 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3740 dev_t j_dev)
3741 {
3742 struct buffer_head *bh;
3743 journal_t *journal;
3744 ext4_fsblk_t start;
3745 ext4_fsblk_t len;
3746 int hblock, blocksize;
3747 ext4_fsblk_t sb_block;
3748 unsigned long offset;
3749 struct ext4_super_block *es;
3750 struct block_device *bdev;
3751
3752 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3753
3754 bdev = ext4_blkdev_get(j_dev, sb);
3755 if (bdev == NULL)
3756 return NULL;
3757
3758 if (bd_claim(bdev, sb)) {
3759 ext4_msg(sb, KERN_ERR,
3760 "failed to claim external journal device");
3761 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3762 return NULL;
3763 }
3764
3765 blocksize = sb->s_blocksize;
3766 hblock = bdev_logical_block_size(bdev);
3767 if (blocksize < hblock) {
3768 ext4_msg(sb, KERN_ERR,
3769 "blocksize too small for journal device");
3770 goto out_bdev;
3771 }
3772
3773 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3774 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3775 set_blocksize(bdev, blocksize);
3776 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3777 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3778 "external journal");
3779 goto out_bdev;
3780 }
3781
3782 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3783 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3784 !(le32_to_cpu(es->s_feature_incompat) &
3785 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3786 ext4_msg(sb, KERN_ERR, "external journal has "
3787 "bad superblock");
3788 brelse(bh);
3789 goto out_bdev;
3790 }
3791
3792 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3793 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3794 brelse(bh);
3795 goto out_bdev;
3796 }
3797
3798 len = ext4_blocks_count(es);
3799 start = sb_block + 1;
3800 brelse(bh); /* we're done with the superblock */
3801
3802 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3803 start, len, blocksize);
3804 if (!journal) {
3805 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3806 goto out_bdev;
3807 }
3808 journal->j_private = sb;
3809 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3810 wait_on_buffer(journal->j_sb_buffer);
3811 if (!buffer_uptodate(journal->j_sb_buffer)) {
3812 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3813 goto out_journal;
3814 }
3815 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3816 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3817 "user (unsupported) - %d",
3818 be32_to_cpu(journal->j_superblock->s_nr_users));
3819 goto out_journal;
3820 }
3821 EXT4_SB(sb)->journal_bdev = bdev;
3822 ext4_init_journal_params(sb, journal);
3823 return journal;
3824
3825 out_journal:
3826 jbd2_journal_destroy(journal);
3827 out_bdev:
3828 ext4_blkdev_put(bdev);
3829 return NULL;
3830 }
3831
3832 static int ext4_load_journal(struct super_block *sb,
3833 struct ext4_super_block *es,
3834 unsigned long journal_devnum)
3835 {
3836 journal_t *journal;
3837 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3838 dev_t journal_dev;
3839 int err = 0;
3840 int really_read_only;
3841
3842 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3843
3844 if (journal_devnum &&
3845 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3846 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3847 "numbers have changed");
3848 journal_dev = new_decode_dev(journal_devnum);
3849 } else
3850 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3851
3852 really_read_only = bdev_read_only(sb->s_bdev);
3853
3854 /*
3855 * Are we loading a blank journal or performing recovery after a
3856 * crash? For recovery, we need to check in advance whether we
3857 * can get read-write access to the device.
3858 */
3859 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3860 if (sb->s_flags & MS_RDONLY) {
3861 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3862 "required on readonly filesystem");
3863 if (really_read_only) {
3864 ext4_msg(sb, KERN_ERR, "write access "
3865 "unavailable, cannot proceed");
3866 return -EROFS;
3867 }
3868 ext4_msg(sb, KERN_INFO, "write access will "
3869 "be enabled during recovery");
3870 }
3871 }
3872
3873 if (journal_inum && journal_dev) {
3874 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3875 "and inode journals!");
3876 return -EINVAL;
3877 }
3878
3879 if (journal_inum) {
3880 if (!(journal = ext4_get_journal(sb, journal_inum)))
3881 return -EINVAL;
3882 } else {
3883 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3884 return -EINVAL;
3885 }
3886
3887 if (!(journal->j_flags & JBD2_BARRIER))
3888 ext4_msg(sb, KERN_INFO, "barriers disabled");
3889
3890 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3891 err = jbd2_journal_update_format(journal);
3892 if (err) {
3893 ext4_msg(sb, KERN_ERR, "error updating journal");
3894 jbd2_journal_destroy(journal);
3895 return err;
3896 }
3897 }
3898
3899 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3900 err = jbd2_journal_wipe(journal, !really_read_only);
3901 if (!err) {
3902 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3903 if (save)
3904 memcpy(save, ((char *) es) +
3905 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
3906 err = jbd2_journal_load(journal);
3907 if (save)
3908 memcpy(((char *) es) + EXT4_S_ERR_START,
3909 save, EXT4_S_ERR_LEN);
3910 kfree(save);
3911 }
3912
3913 if (err) {
3914 ext4_msg(sb, KERN_ERR, "error loading journal");
3915 jbd2_journal_destroy(journal);
3916 return err;
3917 }
3918
3919 EXT4_SB(sb)->s_journal = journal;
3920 ext4_clear_journal_err(sb, es);
3921
3922 if (!really_read_only && journal_devnum &&
3923 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3924 es->s_journal_dev = cpu_to_le32(journal_devnum);
3925
3926 /* Make sure we flush the recovery flag to disk. */
3927 ext4_commit_super(sb, 1);
3928 }
3929
3930 return 0;
3931 }
3932
3933 static int ext4_commit_super(struct super_block *sb, int sync)
3934 {
3935 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3936 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3937 int error = 0;
3938
3939 if (!sbh)
3940 return error;
3941 if (buffer_write_io_error(sbh)) {
3942 /*
3943 * Oh, dear. A previous attempt to write the
3944 * superblock failed. This could happen because the
3945 * USB device was yanked out. Or it could happen to
3946 * be a transient write error and maybe the block will
3947 * be remapped. Nothing we can do but to retry the
3948 * write and hope for the best.
3949 */
3950 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3951 "superblock detected");
3952 clear_buffer_write_io_error(sbh);
3953 set_buffer_uptodate(sbh);
3954 }
3955 /*
3956 * If the file system is mounted read-only, don't update the
3957 * superblock write time. This avoids updating the superblock
3958 * write time when we are mounting the root file system
3959 * read/only but we need to replay the journal; at that point,
3960 * for people who are east of GMT and who make their clock
3961 * tick in localtime for Windows bug-for-bug compatibility,
3962 * the clock is set in the future, and this will cause e2fsck
3963 * to complain and force a full file system check.
3964 */
3965 if (!(sb->s_flags & MS_RDONLY))
3966 es->s_wtime = cpu_to_le32(get_seconds());
3967 if (sb->s_bdev->bd_part)
3968 es->s_kbytes_written =
3969 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3970 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3971 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3972 else
3973 es->s_kbytes_written =
3974 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
3975 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3976 &EXT4_SB(sb)->s_freeblocks_counter));
3977 es->s_free_inodes_count =
3978 cpu_to_le32(percpu_counter_sum_positive(
3979 &EXT4_SB(sb)->s_freeinodes_counter));
3980 sb->s_dirt = 0;
3981 BUFFER_TRACE(sbh, "marking dirty");
3982 mark_buffer_dirty(sbh);
3983 if (sync) {
3984 error = sync_dirty_buffer(sbh);
3985 if (error)
3986 return error;
3987
3988 error = buffer_write_io_error(sbh);
3989 if (error) {
3990 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3991 "superblock");
3992 clear_buffer_write_io_error(sbh);
3993 set_buffer_uptodate(sbh);
3994 }
3995 }
3996 return error;
3997 }
3998
3999 /*
4000 * Have we just finished recovery? If so, and if we are mounting (or
4001 * remounting) the filesystem readonly, then we will end up with a
4002 * consistent fs on disk. Record that fact.
4003 */
4004 static void ext4_mark_recovery_complete(struct super_block *sb,
4005 struct ext4_super_block *es)
4006 {
4007 journal_t *journal = EXT4_SB(sb)->s_journal;
4008
4009 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4010 BUG_ON(journal != NULL);
4011 return;
4012 }
4013 jbd2_journal_lock_updates(journal);
4014 if (jbd2_journal_flush(journal) < 0)
4015 goto out;
4016
4017 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4018 sb->s_flags & MS_RDONLY) {
4019 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4020 ext4_commit_super(sb, 1);
4021 }
4022
4023 out:
4024 jbd2_journal_unlock_updates(journal);
4025 }
4026
4027 /*
4028 * If we are mounting (or read-write remounting) a filesystem whose journal
4029 * has recorded an error from a previous lifetime, move that error to the
4030 * main filesystem now.
4031 */
4032 static void ext4_clear_journal_err(struct super_block *sb,
4033 struct ext4_super_block *es)
4034 {
4035 journal_t *journal;
4036 int j_errno;
4037 const char *errstr;
4038
4039 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4040
4041 journal = EXT4_SB(sb)->s_journal;
4042
4043 /*
4044 * Now check for any error status which may have been recorded in the
4045 * journal by a prior ext4_error() or ext4_abort()
4046 */
4047
4048 j_errno = jbd2_journal_errno(journal);
4049 if (j_errno) {
4050 char nbuf[16];
4051
4052 errstr = ext4_decode_error(sb, j_errno, nbuf);
4053 ext4_warning(sb, "Filesystem error recorded "
4054 "from previous mount: %s", errstr);
4055 ext4_warning(sb, "Marking fs in need of filesystem check.");
4056
4057 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4058 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4059 ext4_commit_super(sb, 1);
4060
4061 jbd2_journal_clear_err(journal);
4062 }
4063 }
4064
4065 /*
4066 * Force the running and committing transactions to commit,
4067 * and wait on the commit.
4068 */
4069 int ext4_force_commit(struct super_block *sb)
4070 {
4071 journal_t *journal;
4072 int ret = 0;
4073
4074 if (sb->s_flags & MS_RDONLY)
4075 return 0;
4076
4077 journal = EXT4_SB(sb)->s_journal;
4078 if (journal) {
4079 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4080 ret = ext4_journal_force_commit(journal);
4081 }
4082
4083 return ret;
4084 }
4085
4086 static void ext4_write_super(struct super_block *sb)
4087 {
4088 lock_super(sb);
4089 ext4_commit_super(sb, 1);
4090 unlock_super(sb);
4091 }
4092
4093 static int ext4_sync_fs(struct super_block *sb, int wait)
4094 {
4095 int ret = 0;
4096 tid_t target;
4097 struct ext4_sb_info *sbi = EXT4_SB(sb);
4098
4099 trace_ext4_sync_fs(sb, wait);
4100 flush_workqueue(sbi->dio_unwritten_wq);
4101 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4102 if (wait)
4103 jbd2_log_wait_commit(sbi->s_journal, target);
4104 }
4105 return ret;
4106 }
4107
4108 /*
4109 * LVM calls this function before a (read-only) snapshot is created. This
4110 * gives us a chance to flush the journal completely and mark the fs clean.
4111 */
4112 static int ext4_freeze(struct super_block *sb)
4113 {
4114 int error = 0;
4115 journal_t *journal;
4116
4117 if (sb->s_flags & MS_RDONLY)
4118 return 0;
4119
4120 journal = EXT4_SB(sb)->s_journal;
4121
4122 /* Now we set up the journal barrier. */
4123 jbd2_journal_lock_updates(journal);
4124
4125 /*
4126 * Don't clear the needs_recovery flag if we failed to flush
4127 * the journal.
4128 */
4129 error = jbd2_journal_flush(journal);
4130 if (error < 0)
4131 goto out;
4132
4133 /* Journal blocked and flushed, clear needs_recovery flag. */
4134 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4135 error = ext4_commit_super(sb, 1);
4136 out:
4137 /* we rely on s_frozen to stop further updates */
4138 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4139 return error;
4140 }
4141
4142 /*
4143 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4144 * flag here, even though the filesystem is not technically dirty yet.
4145 */
4146 static int ext4_unfreeze(struct super_block *sb)
4147 {
4148 if (sb->s_flags & MS_RDONLY)
4149 return 0;
4150
4151 lock_super(sb);
4152 /* Reset the needs_recovery flag before the fs is unlocked. */
4153 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4154 ext4_commit_super(sb, 1);
4155 unlock_super(sb);
4156 return 0;
4157 }
4158
4159 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4160 {
4161 struct ext4_super_block *es;
4162 struct ext4_sb_info *sbi = EXT4_SB(sb);
4163 ext4_fsblk_t n_blocks_count = 0;
4164 unsigned long old_sb_flags;
4165 struct ext4_mount_options old_opts;
4166 int enable_quota = 0;
4167 ext4_group_t g;
4168 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4169 int err;
4170 #ifdef CONFIG_QUOTA
4171 int i;
4172 #endif
4173 char *orig_data = kstrdup(data, GFP_KERNEL);
4174
4175 /* Store the original options */
4176 lock_super(sb);
4177 old_sb_flags = sb->s_flags;
4178 old_opts.s_mount_opt = sbi->s_mount_opt;
4179 old_opts.s_resuid = sbi->s_resuid;
4180 old_opts.s_resgid = sbi->s_resgid;
4181 old_opts.s_commit_interval = sbi->s_commit_interval;
4182 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4183 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4184 #ifdef CONFIG_QUOTA
4185 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4186 for (i = 0; i < MAXQUOTAS; i++)
4187 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4188 #endif
4189 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4190 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4191
4192 /*
4193 * Allow the "check" option to be passed as a remount option.
4194 */
4195 if (!parse_options(data, sb, NULL, &journal_ioprio,
4196 &n_blocks_count, 1)) {
4197 err = -EINVAL;
4198 goto restore_opts;
4199 }
4200
4201 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4202 ext4_abort(sb, "Abort forced by user");
4203
4204 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4205 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4206
4207 es = sbi->s_es;
4208
4209 if (sbi->s_journal) {
4210 ext4_init_journal_params(sb, sbi->s_journal);
4211 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4212 }
4213
4214 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
4215 n_blocks_count > ext4_blocks_count(es)) {
4216 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4217 err = -EROFS;
4218 goto restore_opts;
4219 }
4220
4221 if (*flags & MS_RDONLY) {
4222 err = dquot_suspend(sb, -1);
4223 if (err < 0)
4224 goto restore_opts;
4225
4226 /*
4227 * First of all, the unconditional stuff we have to do
4228 * to disable replay of the journal when we next remount
4229 */
4230 sb->s_flags |= MS_RDONLY;
4231
4232 /*
4233 * OK, test if we are remounting a valid rw partition
4234 * readonly, and if so set the rdonly flag and then
4235 * mark the partition as valid again.
4236 */
4237 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4238 (sbi->s_mount_state & EXT4_VALID_FS))
4239 es->s_state = cpu_to_le16(sbi->s_mount_state);
4240
4241 if (sbi->s_journal)
4242 ext4_mark_recovery_complete(sb, es);
4243 } else {
4244 /* Make sure we can mount this feature set readwrite */
4245 if (!ext4_feature_set_ok(sb, 0)) {
4246 err = -EROFS;
4247 goto restore_opts;
4248 }
4249 /*
4250 * Make sure the group descriptor checksums
4251 * are sane. If they aren't, refuse to remount r/w.
4252 */
4253 for (g = 0; g < sbi->s_groups_count; g++) {
4254 struct ext4_group_desc *gdp =
4255 ext4_get_group_desc(sb, g, NULL);
4256
4257 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4258 ext4_msg(sb, KERN_ERR,
4259 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4260 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4261 le16_to_cpu(gdp->bg_checksum));
4262 err = -EINVAL;
4263 goto restore_opts;
4264 }
4265 }
4266
4267 /*
4268 * If we have an unprocessed orphan list hanging
4269 * around from a previously readonly bdev mount,
4270 * require a full umount/remount for now.
4271 */
4272 if (es->s_last_orphan) {
4273 ext4_msg(sb, KERN_WARNING, "Couldn't "
4274 "remount RDWR because of unprocessed "
4275 "orphan inode list. Please "
4276 "umount/remount instead");
4277 err = -EINVAL;
4278 goto restore_opts;
4279 }
4280
4281 /*
4282 * Mounting a RDONLY partition read-write, so reread
4283 * and store the current valid flag. (It may have
4284 * been changed by e2fsck since we originally mounted
4285 * the partition.)
4286 */
4287 if (sbi->s_journal)
4288 ext4_clear_journal_err(sb, es);
4289 sbi->s_mount_state = le16_to_cpu(es->s_state);
4290 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
4291 goto restore_opts;
4292 if (!ext4_setup_super(sb, es, 0))
4293 sb->s_flags &= ~MS_RDONLY;
4294 enable_quota = 1;
4295 }
4296 }
4297
4298 /*
4299 * Reinitialize lazy itable initialization thread based on
4300 * current settings
4301 */
4302 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4303 ext4_unregister_li_request(sb);
4304 else {
4305 ext4_group_t first_not_zeroed;
4306 first_not_zeroed = ext4_has_uninit_itable(sb);
4307 ext4_register_li_request(sb, first_not_zeroed);
4308 }
4309
4310 ext4_setup_system_zone(sb);
4311 if (sbi->s_journal == NULL)
4312 ext4_commit_super(sb, 1);
4313
4314 #ifdef CONFIG_QUOTA
4315 /* Release old quota file names */
4316 for (i = 0; i < MAXQUOTAS; i++)
4317 if (old_opts.s_qf_names[i] &&
4318 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4319 kfree(old_opts.s_qf_names[i]);
4320 #endif
4321 unlock_super(sb);
4322 if (enable_quota)
4323 dquot_resume(sb, -1);
4324
4325 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4326 kfree(orig_data);
4327 return 0;
4328
4329 restore_opts:
4330 sb->s_flags = old_sb_flags;
4331 sbi->s_mount_opt = old_opts.s_mount_opt;
4332 sbi->s_resuid = old_opts.s_resuid;
4333 sbi->s_resgid = old_opts.s_resgid;
4334 sbi->s_commit_interval = old_opts.s_commit_interval;
4335 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4336 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4337 #ifdef CONFIG_QUOTA
4338 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4339 for (i = 0; i < MAXQUOTAS; i++) {
4340 if (sbi->s_qf_names[i] &&
4341 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4342 kfree(sbi->s_qf_names[i]);
4343 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4344 }
4345 #endif
4346 unlock_super(sb);
4347 kfree(orig_data);
4348 return err;
4349 }
4350
4351 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4352 {
4353 struct super_block *sb = dentry->d_sb;
4354 struct ext4_sb_info *sbi = EXT4_SB(sb);
4355 struct ext4_super_block *es = sbi->s_es;
4356 u64 fsid;
4357
4358 if (test_opt(sb, MINIX_DF)) {
4359 sbi->s_overhead_last = 0;
4360 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4361 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4362 ext4_fsblk_t overhead = 0;
4363
4364 /*
4365 * Compute the overhead (FS structures). This is constant
4366 * for a given filesystem unless the number of block groups
4367 * changes so we cache the previous value until it does.
4368 */
4369
4370 /*
4371 * All of the blocks before first_data_block are
4372 * overhead
4373 */
4374 overhead = le32_to_cpu(es->s_first_data_block);
4375
4376 /*
4377 * Add the overhead attributed to the superblock and
4378 * block group descriptors. If the sparse superblocks
4379 * feature is turned on, then not all groups have this.
4380 */
4381 for (i = 0; i < ngroups; i++) {
4382 overhead += ext4_bg_has_super(sb, i) +
4383 ext4_bg_num_gdb(sb, i);
4384 cond_resched();
4385 }
4386
4387 /*
4388 * Every block group has an inode bitmap, a block
4389 * bitmap, and an inode table.
4390 */
4391 overhead += ngroups * (2 + sbi->s_itb_per_group);
4392 sbi->s_overhead_last = overhead;
4393 smp_wmb();
4394 sbi->s_blocks_last = ext4_blocks_count(es);
4395 }
4396
4397 buf->f_type = EXT4_SUPER_MAGIC;
4398 buf->f_bsize = sb->s_blocksize;
4399 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
4400 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
4401 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
4402 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4403 if (buf->f_bfree < ext4_r_blocks_count(es))
4404 buf->f_bavail = 0;
4405 buf->f_files = le32_to_cpu(es->s_inodes_count);
4406 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4407 buf->f_namelen = EXT4_NAME_LEN;
4408 fsid = le64_to_cpup((void *)es->s_uuid) ^
4409 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4410 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4411 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4412
4413 return 0;
4414 }
4415
4416 /* Helper function for writing quotas on sync - we need to start transaction
4417 * before quota file is locked for write. Otherwise the are possible deadlocks:
4418 * Process 1 Process 2
4419 * ext4_create() quota_sync()
4420 * jbd2_journal_start() write_dquot()
4421 * dquot_initialize() down(dqio_mutex)
4422 * down(dqio_mutex) jbd2_journal_start()
4423 *
4424 */
4425
4426 #ifdef CONFIG_QUOTA
4427
4428 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4429 {
4430 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4431 }
4432
4433 static int ext4_write_dquot(struct dquot *dquot)
4434 {
4435 int ret, err;
4436 handle_t *handle;
4437 struct inode *inode;
4438
4439 inode = dquot_to_inode(dquot);
4440 handle = ext4_journal_start(inode,
4441 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4442 if (IS_ERR(handle))
4443 return PTR_ERR(handle);
4444 ret = dquot_commit(dquot);
4445 err = ext4_journal_stop(handle);
4446 if (!ret)
4447 ret = err;
4448 return ret;
4449 }
4450
4451 static int ext4_acquire_dquot(struct dquot *dquot)
4452 {
4453 int ret, err;
4454 handle_t *handle;
4455
4456 handle = ext4_journal_start(dquot_to_inode(dquot),
4457 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4458 if (IS_ERR(handle))
4459 return PTR_ERR(handle);
4460 ret = dquot_acquire(dquot);
4461 err = ext4_journal_stop(handle);
4462 if (!ret)
4463 ret = err;
4464 return ret;
4465 }
4466
4467 static int ext4_release_dquot(struct dquot *dquot)
4468 {
4469 int ret, err;
4470 handle_t *handle;
4471
4472 handle = ext4_journal_start(dquot_to_inode(dquot),
4473 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4474 if (IS_ERR(handle)) {
4475 /* Release dquot anyway to avoid endless cycle in dqput() */
4476 dquot_release(dquot);
4477 return PTR_ERR(handle);
4478 }
4479 ret = dquot_release(dquot);
4480 err = ext4_journal_stop(handle);
4481 if (!ret)
4482 ret = err;
4483 return ret;
4484 }
4485
4486 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4487 {
4488 /* Are we journaling quotas? */
4489 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4490 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4491 dquot_mark_dquot_dirty(dquot);
4492 return ext4_write_dquot(dquot);
4493 } else {
4494 return dquot_mark_dquot_dirty(dquot);
4495 }
4496 }
4497
4498 static int ext4_write_info(struct super_block *sb, int type)
4499 {
4500 int ret, err;
4501 handle_t *handle;
4502
4503 /* Data block + inode block */
4504 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4505 if (IS_ERR(handle))
4506 return PTR_ERR(handle);
4507 ret = dquot_commit_info(sb, type);
4508 err = ext4_journal_stop(handle);
4509 if (!ret)
4510 ret = err;
4511 return ret;
4512 }
4513
4514 /*
4515 * Turn on quotas during mount time - we need to find
4516 * the quota file and such...
4517 */
4518 static int ext4_quota_on_mount(struct super_block *sb, int type)
4519 {
4520 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4521 EXT4_SB(sb)->s_jquota_fmt, type);
4522 }
4523
4524 /*
4525 * Standard function to be called on quota_on
4526 */
4527 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4528 char *name)
4529 {
4530 int err;
4531 struct path path;
4532
4533 if (!test_opt(sb, QUOTA))
4534 return -EINVAL;
4535
4536 err = kern_path(name, LOOKUP_FOLLOW, &path);
4537 if (err)
4538 return err;
4539
4540 /* Quotafile not on the same filesystem? */
4541 if (path.mnt->mnt_sb != sb) {
4542 path_put(&path);
4543 return -EXDEV;
4544 }
4545 /* Journaling quota? */
4546 if (EXT4_SB(sb)->s_qf_names[type]) {
4547 /* Quotafile not in fs root? */
4548 if (path.dentry->d_parent != sb->s_root)
4549 ext4_msg(sb, KERN_WARNING,
4550 "Quota file not on filesystem root. "
4551 "Journaled quota will not work");
4552 }
4553
4554 /*
4555 * When we journal data on quota file, we have to flush journal to see
4556 * all updates to the file when we bypass pagecache...
4557 */
4558 if (EXT4_SB(sb)->s_journal &&
4559 ext4_should_journal_data(path.dentry->d_inode)) {
4560 /*
4561 * We don't need to lock updates but journal_flush() could
4562 * otherwise be livelocked...
4563 */
4564 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4565 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4566 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4567 if (err) {
4568 path_put(&path);
4569 return err;
4570 }
4571 }
4572
4573 err = dquot_quota_on_path(sb, type, format_id, &path);
4574 path_put(&path);
4575 return err;
4576 }
4577
4578 static int ext4_quota_off(struct super_block *sb, int type)
4579 {
4580 /* Force all delayed allocation blocks to be allocated.
4581 * Caller already holds s_umount sem */
4582 if (test_opt(sb, DELALLOC))
4583 sync_filesystem(sb);
4584
4585 return dquot_quota_off(sb, type);
4586 }
4587
4588 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4589 * acquiring the locks... As quota files are never truncated and quota code
4590 * itself serializes the operations (and noone else should touch the files)
4591 * we don't have to be afraid of races */
4592 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4593 size_t len, loff_t off)
4594 {
4595 struct inode *inode = sb_dqopt(sb)->files[type];
4596 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4597 int err = 0;
4598 int offset = off & (sb->s_blocksize - 1);
4599 int tocopy;
4600 size_t toread;
4601 struct buffer_head *bh;
4602 loff_t i_size = i_size_read(inode);
4603
4604 if (off > i_size)
4605 return 0;
4606 if (off+len > i_size)
4607 len = i_size-off;
4608 toread = len;
4609 while (toread > 0) {
4610 tocopy = sb->s_blocksize - offset < toread ?
4611 sb->s_blocksize - offset : toread;
4612 bh = ext4_bread(NULL, inode, blk, 0, &err);
4613 if (err)
4614 return err;
4615 if (!bh) /* A hole? */
4616 memset(data, 0, tocopy);
4617 else
4618 memcpy(data, bh->b_data+offset, tocopy);
4619 brelse(bh);
4620 offset = 0;
4621 toread -= tocopy;
4622 data += tocopy;
4623 blk++;
4624 }
4625 return len;
4626 }
4627
4628 /* Write to quotafile (we know the transaction is already started and has
4629 * enough credits) */
4630 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4631 const char *data, size_t len, loff_t off)
4632 {
4633 struct inode *inode = sb_dqopt(sb)->files[type];
4634 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4635 int err = 0;
4636 int offset = off & (sb->s_blocksize - 1);
4637 struct buffer_head *bh;
4638 handle_t *handle = journal_current_handle();
4639
4640 if (EXT4_SB(sb)->s_journal && !handle) {
4641 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4642 " cancelled because transaction is not started",
4643 (unsigned long long)off, (unsigned long long)len);
4644 return -EIO;
4645 }
4646 /*
4647 * Since we account only one data block in transaction credits,
4648 * then it is impossible to cross a block boundary.
4649 */
4650 if (sb->s_blocksize - offset < len) {
4651 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4652 " cancelled because not block aligned",
4653 (unsigned long long)off, (unsigned long long)len);
4654 return -EIO;
4655 }
4656
4657 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4658 bh = ext4_bread(handle, inode, blk, 1, &err);
4659 if (!bh)
4660 goto out;
4661 err = ext4_journal_get_write_access(handle, bh);
4662 if (err) {
4663 brelse(bh);
4664 goto out;
4665 }
4666 lock_buffer(bh);
4667 memcpy(bh->b_data+offset, data, len);
4668 flush_dcache_page(bh->b_page);
4669 unlock_buffer(bh);
4670 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4671 brelse(bh);
4672 out:
4673 if (err) {
4674 mutex_unlock(&inode->i_mutex);
4675 return err;
4676 }
4677 if (inode->i_size < off + len) {
4678 i_size_write(inode, off + len);
4679 EXT4_I(inode)->i_disksize = inode->i_size;
4680 }
4681 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4682 ext4_mark_inode_dirty(handle, inode);
4683 mutex_unlock(&inode->i_mutex);
4684 return len;
4685 }
4686
4687 #endif
4688
4689 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4690 const char *dev_name, void *data)
4691 {
4692 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
4693 }
4694
4695 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4696 static struct file_system_type ext2_fs_type = {
4697 .owner = THIS_MODULE,
4698 .name = "ext2",
4699 .mount = ext4_mount,
4700 .kill_sb = kill_block_super,
4701 .fs_flags = FS_REQUIRES_DEV,
4702 };
4703
4704 static inline void register_as_ext2(void)
4705 {
4706 int err = register_filesystem(&ext2_fs_type);
4707 if (err)
4708 printk(KERN_WARNING
4709 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4710 }
4711
4712 static inline void unregister_as_ext2(void)
4713 {
4714 unregister_filesystem(&ext2_fs_type);
4715 }
4716 MODULE_ALIAS("ext2");
4717 #else
4718 static inline void register_as_ext2(void) { }
4719 static inline void unregister_as_ext2(void) { }
4720 #endif
4721
4722 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4723 static inline void register_as_ext3(void)
4724 {
4725 int err = register_filesystem(&ext3_fs_type);
4726 if (err)
4727 printk(KERN_WARNING
4728 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4729 }
4730
4731 static inline void unregister_as_ext3(void)
4732 {
4733 unregister_filesystem(&ext3_fs_type);
4734 }
4735 MODULE_ALIAS("ext3");
4736 #else
4737 static inline void register_as_ext3(void) { }
4738 static inline void unregister_as_ext3(void) { }
4739 #endif
4740
4741 static struct file_system_type ext4_fs_type = {
4742 .owner = THIS_MODULE,
4743 .name = "ext4",
4744 .mount = ext4_mount,
4745 .kill_sb = kill_block_super,
4746 .fs_flags = FS_REQUIRES_DEV,
4747 };
4748
4749 int __init ext4_init_feat_adverts(void)
4750 {
4751 struct ext4_features *ef;
4752 int ret = -ENOMEM;
4753
4754 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4755 if (!ef)
4756 goto out;
4757
4758 ef->f_kobj.kset = ext4_kset;
4759 init_completion(&ef->f_kobj_unregister);
4760 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4761 "features");
4762 if (ret) {
4763 kfree(ef);
4764 goto out;
4765 }
4766
4767 ext4_feat = ef;
4768 ret = 0;
4769 out:
4770 return ret;
4771 }
4772
4773 static int __init ext4_init_fs(void)
4774 {
4775 int err;
4776
4777 ext4_check_flag_values();
4778 err = ext4_init_pageio();
4779 if (err)
4780 return err;
4781 err = ext4_init_system_zone();
4782 if (err)
4783 goto out5;
4784 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4785 if (!ext4_kset)
4786 goto out4;
4787 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4788
4789 err = ext4_init_feat_adverts();
4790
4791 err = ext4_init_mballoc();
4792 if (err)
4793 goto out3;
4794
4795 err = ext4_init_xattr();
4796 if (err)
4797 goto out2;
4798 err = init_inodecache();
4799 if (err)
4800 goto out1;
4801 register_as_ext2();
4802 register_as_ext3();
4803 err = register_filesystem(&ext4_fs_type);
4804 if (err)
4805 goto out;
4806
4807 ext4_li_info = NULL;
4808 mutex_init(&ext4_li_mtx);
4809 return 0;
4810 out:
4811 unregister_as_ext2();
4812 unregister_as_ext3();
4813 destroy_inodecache();
4814 out1:
4815 ext4_exit_xattr();
4816 out2:
4817 ext4_exit_mballoc();
4818 out3:
4819 kfree(ext4_feat);
4820 remove_proc_entry("fs/ext4", NULL);
4821 kset_unregister(ext4_kset);
4822 out4:
4823 ext4_exit_system_zone();
4824 out5:
4825 ext4_exit_pageio();
4826 return err;
4827 }
4828
4829 static void __exit ext4_exit_fs(void)
4830 {
4831 ext4_destroy_lazyinit_thread();
4832 unregister_as_ext2();
4833 unregister_as_ext3();
4834 unregister_filesystem(&ext4_fs_type);
4835 destroy_inodecache();
4836 ext4_exit_xattr();
4837 ext4_exit_mballoc();
4838 remove_proc_entry("fs/ext4", NULL);
4839 kset_unregister(ext4_kset);
4840 ext4_exit_system_zone();
4841 ext4_exit_pageio();
4842 }
4843
4844 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4845 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4846 MODULE_LICENSE("GPL");
4847 module_init(ext4_init_fs)
4848 module_exit(ext4_exit_fs)
WandBoard kernel