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Staging: hv: remove OnChildDeviceRemove vmbus_driver callback
[zen-stable.git] / fs / ext4 / super.c
blob61182fe6254e94ad606a6c67fed1b30ef289ad38
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 .trim_fs = ext4_trim_fs
1201 };
1202
1203 static const struct super_operations ext4_nojournal_sops = {
1204 .alloc_inode = ext4_alloc_inode,
1205 .destroy_inode = ext4_destroy_inode,
1206 .write_inode = ext4_write_inode,
1207 .dirty_inode = ext4_dirty_inode,
1208 .drop_inode = ext4_drop_inode,
1209 .evict_inode = ext4_evict_inode,
1210 .write_super = ext4_write_super,
1211 .put_super = ext4_put_super,
1212 .statfs = ext4_statfs,
1213 .remount_fs = ext4_remount,
1214 .show_options = ext4_show_options,
1215 #ifdef CONFIG_QUOTA
1216 .quota_read = ext4_quota_read,
1217 .quota_write = ext4_quota_write,
1218 #endif
1219 .bdev_try_to_free_page = bdev_try_to_free_page,
1220 };
1221
1222 static const struct export_operations ext4_export_ops = {
1223 .fh_to_dentry = ext4_fh_to_dentry,
1224 .fh_to_parent = ext4_fh_to_parent,
1225 .get_parent = ext4_get_parent,
1226 };
1227
1228 enum {
1229 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1230 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1231 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1232 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1233 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1234 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1235 Opt_journal_update, Opt_journal_dev,
1236 Opt_journal_checksum, Opt_journal_async_commit,
1237 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1238 Opt_data_err_abort, Opt_data_err_ignore,
1239 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1240 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1241 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1242 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1243 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1244 Opt_block_validity, Opt_noblock_validity,
1245 Opt_inode_readahead_blks, Opt_journal_ioprio,
1246 Opt_dioread_nolock, Opt_dioread_lock,
1247 Opt_discard, Opt_nodiscard,
1248 Opt_init_inode_table, Opt_noinit_inode_table,
1249 };
1250
1251 static const match_table_t tokens = {
1252 {Opt_bsd_df, "bsddf"},
1253 {Opt_minix_df, "minixdf"},
1254 {Opt_grpid, "grpid"},
1255 {Opt_grpid, "bsdgroups"},
1256 {Opt_nogrpid, "nogrpid"},
1257 {Opt_nogrpid, "sysvgroups"},
1258 {Opt_resgid, "resgid=%u"},
1259 {Opt_resuid, "resuid=%u"},
1260 {Opt_sb, "sb=%u"},
1261 {Opt_err_cont, "errors=continue"},
1262 {Opt_err_panic, "errors=panic"},
1263 {Opt_err_ro, "errors=remount-ro"},
1264 {Opt_nouid32, "nouid32"},
1265 {Opt_debug, "debug"},
1266 {Opt_oldalloc, "oldalloc"},
1267 {Opt_orlov, "orlov"},
1268 {Opt_user_xattr, "user_xattr"},
1269 {Opt_nouser_xattr, "nouser_xattr"},
1270 {Opt_acl, "acl"},
1271 {Opt_noacl, "noacl"},
1272 {Opt_noload, "noload"},
1273 {Opt_noload, "norecovery"},
1274 {Opt_nobh, "nobh"},
1275 {Opt_bh, "bh"},
1276 {Opt_commit, "commit=%u"},
1277 {Opt_min_batch_time, "min_batch_time=%u"},
1278 {Opt_max_batch_time, "max_batch_time=%u"},
1279 {Opt_journal_update, "journal=update"},
1280 {Opt_journal_dev, "journal_dev=%u"},
1281 {Opt_journal_checksum, "journal_checksum"},
1282 {Opt_journal_async_commit, "journal_async_commit"},
1283 {Opt_abort, "abort"},
1284 {Opt_data_journal, "data=journal"},
1285 {Opt_data_ordered, "data=ordered"},
1286 {Opt_data_writeback, "data=writeback"},
1287 {Opt_data_err_abort, "data_err=abort"},
1288 {Opt_data_err_ignore, "data_err=ignore"},
1289 {Opt_offusrjquota, "usrjquota="},
1290 {Opt_usrjquota, "usrjquota=%s"},
1291 {Opt_offgrpjquota, "grpjquota="},
1292 {Opt_grpjquota, "grpjquota=%s"},
1293 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1294 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1295 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1296 {Opt_grpquota, "grpquota"},
1297 {Opt_noquota, "noquota"},
1298 {Opt_quota, "quota"},
1299 {Opt_usrquota, "usrquota"},
1300 {Opt_barrier, "barrier=%u"},
1301 {Opt_barrier, "barrier"},
1302 {Opt_nobarrier, "nobarrier"},
1303 {Opt_i_version, "i_version"},
1304 {Opt_stripe, "stripe=%u"},
1305 {Opt_resize, "resize"},
1306 {Opt_delalloc, "delalloc"},
1307 {Opt_nodelalloc, "nodelalloc"},
1308 {Opt_block_validity, "block_validity"},
1309 {Opt_noblock_validity, "noblock_validity"},
1310 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1311 {Opt_journal_ioprio, "journal_ioprio=%u"},
1312 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1313 {Opt_auto_da_alloc, "auto_da_alloc"},
1314 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1315 {Opt_dioread_nolock, "dioread_nolock"},
1316 {Opt_dioread_lock, "dioread_lock"},
1317 {Opt_discard, "discard"},
1318 {Opt_nodiscard, "nodiscard"},
1319 {Opt_init_inode_table, "init_itable=%u"},
1320 {Opt_init_inode_table, "init_itable"},
1321 {Opt_noinit_inode_table, "noinit_itable"},
1322 {Opt_err, NULL},
1323 };
1324
1325 static ext4_fsblk_t get_sb_block(void **data)
1326 {
1327 ext4_fsblk_t sb_block;
1328 char *options = (char *) *data;
1329
1330 if (!options || strncmp(options, "sb=", 3) != 0)
1331 return 1; /* Default location */
1332
1333 options += 3;
1334 /* TODO: use simple_strtoll with >32bit ext4 */
1335 sb_block = simple_strtoul(options, &options, 0);
1336 if (*options && *options != ',') {
1337 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1338 (char *) *data);
1339 return 1;
1340 }
1341 if (*options == ',')
1342 options++;
1343 *data = (void *) options;
1344
1345 return sb_block;
1346 }
1347
1348 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1349 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1350 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1351
1352 #ifdef CONFIG_QUOTA
1353 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1354 {
1355 struct ext4_sb_info *sbi = EXT4_SB(sb);
1356 char *qname;
1357
1358 if (sb_any_quota_loaded(sb) &&
1359 !sbi->s_qf_names[qtype]) {
1360 ext4_msg(sb, KERN_ERR,
1361 "Cannot change journaled "
1362 "quota options when quota turned on");
1363 return 0;
1364 }
1365 qname = match_strdup(args);
1366 if (!qname) {
1367 ext4_msg(sb, KERN_ERR,
1368 "Not enough memory for storing quotafile name");
1369 return 0;
1370 }
1371 if (sbi->s_qf_names[qtype] &&
1372 strcmp(sbi->s_qf_names[qtype], qname)) {
1373 ext4_msg(sb, KERN_ERR,
1374 "%s quota file already specified", QTYPE2NAME(qtype));
1375 kfree(qname);
1376 return 0;
1377 }
1378 sbi->s_qf_names[qtype] = qname;
1379 if (strchr(sbi->s_qf_names[qtype], '/')) {
1380 ext4_msg(sb, KERN_ERR,
1381 "quotafile must be on filesystem root");
1382 kfree(sbi->s_qf_names[qtype]);
1383 sbi->s_qf_names[qtype] = NULL;
1384 return 0;
1385 }
1386 set_opt(sbi->s_mount_opt, QUOTA);
1387 return 1;
1388 }
1389
1390 static int clear_qf_name(struct super_block *sb, int qtype)
1391 {
1392
1393 struct ext4_sb_info *sbi = EXT4_SB(sb);
1394
1395 if (sb_any_quota_loaded(sb) &&
1396 sbi->s_qf_names[qtype]) {
1397 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1398 " when quota turned on");
1399 return 0;
1400 }
1401 /*
1402 * The space will be released later when all options are confirmed
1403 * to be correct
1404 */
1405 sbi->s_qf_names[qtype] = NULL;
1406 return 1;
1407 }
1408 #endif
1409
1410 static int parse_options(char *options, struct super_block *sb,
1411 unsigned long *journal_devnum,
1412 unsigned int *journal_ioprio,
1413 ext4_fsblk_t *n_blocks_count, int is_remount)
1414 {
1415 struct ext4_sb_info *sbi = EXT4_SB(sb);
1416 char *p;
1417 substring_t args[MAX_OPT_ARGS];
1418 int data_opt = 0;
1419 int option;
1420 #ifdef CONFIG_QUOTA
1421 int qfmt;
1422 #endif
1423
1424 if (!options)
1425 return 1;
1426
1427 while ((p = strsep(&options, ",")) != NULL) {
1428 int token;
1429 if (!*p)
1430 continue;
1431
1432 /*
1433 * Initialize args struct so we know whether arg was
1434 * found; some options take optional arguments.
1435 */
1436 args[0].to = args[0].from = 0;
1437 token = match_token(p, tokens, args);
1438 switch (token) {
1439 case Opt_bsd_df:
1440 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1441 clear_opt(sbi->s_mount_opt, MINIX_DF);
1442 break;
1443 case Opt_minix_df:
1444 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1445 set_opt(sbi->s_mount_opt, MINIX_DF);
1446
1447 break;
1448 case Opt_grpid:
1449 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1450 set_opt(sbi->s_mount_opt, GRPID);
1451
1452 break;
1453 case Opt_nogrpid:
1454 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1455 clear_opt(sbi->s_mount_opt, GRPID);
1456
1457 break;
1458 case Opt_resuid:
1459 if (match_int(&args[0], &option))
1460 return 0;
1461 sbi->s_resuid = option;
1462 break;
1463 case Opt_resgid:
1464 if (match_int(&args[0], &option))
1465 return 0;
1466 sbi->s_resgid = option;
1467 break;
1468 case Opt_sb:
1469 /* handled by get_sb_block() instead of here */
1470 /* *sb_block = match_int(&args[0]); */
1471 break;
1472 case Opt_err_panic:
1473 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1474 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1475 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1476 break;
1477 case Opt_err_ro:
1478 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1479 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1480 set_opt(sbi->s_mount_opt, ERRORS_RO);
1481 break;
1482 case Opt_err_cont:
1483 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1484 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1485 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1486 break;
1487 case Opt_nouid32:
1488 set_opt(sbi->s_mount_opt, NO_UID32);
1489 break;
1490 case Opt_debug:
1491 set_opt(sbi->s_mount_opt, DEBUG);
1492 break;
1493 case Opt_oldalloc:
1494 set_opt(sbi->s_mount_opt, OLDALLOC);
1495 break;
1496 case Opt_orlov:
1497 clear_opt(sbi->s_mount_opt, OLDALLOC);
1498 break;
1499 #ifdef CONFIG_EXT4_FS_XATTR
1500 case Opt_user_xattr:
1501 set_opt(sbi->s_mount_opt, XATTR_USER);
1502 break;
1503 case Opt_nouser_xattr:
1504 clear_opt(sbi->s_mount_opt, XATTR_USER);
1505 break;
1506 #else
1507 case Opt_user_xattr:
1508 case Opt_nouser_xattr:
1509 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1510 break;
1511 #endif
1512 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1513 case Opt_acl:
1514 set_opt(sbi->s_mount_opt, POSIX_ACL);
1515 break;
1516 case Opt_noacl:
1517 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1518 break;
1519 #else
1520 case Opt_acl:
1521 case Opt_noacl:
1522 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1523 break;
1524 #endif
1525 case Opt_journal_update:
1526 /* @@@ FIXME */
1527 /* Eventually we will want to be able to create
1528 a journal file here. For now, only allow the
1529 user to specify an existing inode to be the
1530 journal file. */
1531 if (is_remount) {
1532 ext4_msg(sb, KERN_ERR,
1533 "Cannot specify journal on remount");
1534 return 0;
1535 }
1536 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1537 break;
1538 case Opt_journal_dev:
1539 if (is_remount) {
1540 ext4_msg(sb, KERN_ERR,
1541 "Cannot specify journal on remount");
1542 return 0;
1543 }
1544 if (match_int(&args[0], &option))
1545 return 0;
1546 *journal_devnum = option;
1547 break;
1548 case Opt_journal_checksum:
1549 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1550 break;
1551 case Opt_journal_async_commit:
1552 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1553 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1554 break;
1555 case Opt_noload:
1556 set_opt(sbi->s_mount_opt, NOLOAD);
1557 break;
1558 case Opt_commit:
1559 if (match_int(&args[0], &option))
1560 return 0;
1561 if (option < 0)
1562 return 0;
1563 if (option == 0)
1564 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1565 sbi->s_commit_interval = HZ * option;
1566 break;
1567 case Opt_max_batch_time:
1568 if (match_int(&args[0], &option))
1569 return 0;
1570 if (option < 0)
1571 return 0;
1572 if (option == 0)
1573 option = EXT4_DEF_MAX_BATCH_TIME;
1574 sbi->s_max_batch_time = option;
1575 break;
1576 case Opt_min_batch_time:
1577 if (match_int(&args[0], &option))
1578 return 0;
1579 if (option < 0)
1580 return 0;
1581 sbi->s_min_batch_time = option;
1582 break;
1583 case Opt_data_journal:
1584 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1585 goto datacheck;
1586 case Opt_data_ordered:
1587 data_opt = EXT4_MOUNT_ORDERED_DATA;
1588 goto datacheck;
1589 case Opt_data_writeback:
1590 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1591 datacheck:
1592 if (is_remount) {
1593 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1594 ext4_msg(sb, KERN_ERR,
1595 "Cannot change data mode on remount");
1596 return 0;
1597 }
1598 } else {
1599 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1600 sbi->s_mount_opt |= data_opt;
1601 }
1602 break;
1603 case Opt_data_err_abort:
1604 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1605 break;
1606 case Opt_data_err_ignore:
1607 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1608 break;
1609 #ifdef CONFIG_QUOTA
1610 case Opt_usrjquota:
1611 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1612 return 0;
1613 break;
1614 case Opt_grpjquota:
1615 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1616 return 0;
1617 break;
1618 case Opt_offusrjquota:
1619 if (!clear_qf_name(sb, USRQUOTA))
1620 return 0;
1621 break;
1622 case Opt_offgrpjquota:
1623 if (!clear_qf_name(sb, GRPQUOTA))
1624 return 0;
1625 break;
1626
1627 case Opt_jqfmt_vfsold:
1628 qfmt = QFMT_VFS_OLD;
1629 goto set_qf_format;
1630 case Opt_jqfmt_vfsv0:
1631 qfmt = QFMT_VFS_V0;
1632 goto set_qf_format;
1633 case Opt_jqfmt_vfsv1:
1634 qfmt = QFMT_VFS_V1;
1635 set_qf_format:
1636 if (sb_any_quota_loaded(sb) &&
1637 sbi->s_jquota_fmt != qfmt) {
1638 ext4_msg(sb, KERN_ERR, "Cannot change "
1639 "journaled quota options when "
1640 "quota turned on");
1641 return 0;
1642 }
1643 sbi->s_jquota_fmt = qfmt;
1644 break;
1645 case Opt_quota:
1646 case Opt_usrquota:
1647 set_opt(sbi->s_mount_opt, QUOTA);
1648 set_opt(sbi->s_mount_opt, USRQUOTA);
1649 break;
1650 case Opt_grpquota:
1651 set_opt(sbi->s_mount_opt, QUOTA);
1652 set_opt(sbi->s_mount_opt, GRPQUOTA);
1653 break;
1654 case Opt_noquota:
1655 if (sb_any_quota_loaded(sb)) {
1656 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1657 "options when quota turned on");
1658 return 0;
1659 }
1660 clear_opt(sbi->s_mount_opt, QUOTA);
1661 clear_opt(sbi->s_mount_opt, USRQUOTA);
1662 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1663 break;
1664 #else
1665 case Opt_quota:
1666 case Opt_usrquota:
1667 case Opt_grpquota:
1668 ext4_msg(sb, KERN_ERR,
1669 "quota options not supported");
1670 break;
1671 case Opt_usrjquota:
1672 case Opt_grpjquota:
1673 case Opt_offusrjquota:
1674 case Opt_offgrpjquota:
1675 case Opt_jqfmt_vfsold:
1676 case Opt_jqfmt_vfsv0:
1677 case Opt_jqfmt_vfsv1:
1678 ext4_msg(sb, KERN_ERR,
1679 "journaled quota options not supported");
1680 break;
1681 case Opt_noquota:
1682 break;
1683 #endif
1684 case Opt_abort:
1685 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1686 break;
1687 case Opt_nobarrier:
1688 clear_opt(sbi->s_mount_opt, BARRIER);
1689 break;
1690 case Opt_barrier:
1691 if (args[0].from) {
1692 if (match_int(&args[0], &option))
1693 return 0;
1694 } else
1695 option = 1; /* No argument, default to 1 */
1696 if (option)
1697 set_opt(sbi->s_mount_opt, BARRIER);
1698 else
1699 clear_opt(sbi->s_mount_opt, BARRIER);
1700 break;
1701 case Opt_ignore:
1702 break;
1703 case Opt_resize:
1704 if (!is_remount) {
1705 ext4_msg(sb, KERN_ERR,
1706 "resize option only available "
1707 "for remount");
1708 return 0;
1709 }
1710 if (match_int(&args[0], &option) != 0)
1711 return 0;
1712 *n_blocks_count = option;
1713 break;
1714 case Opt_nobh:
1715 ext4_msg(sb, KERN_WARNING,
1716 "Ignoring deprecated nobh option");
1717 break;
1718 case Opt_bh:
1719 ext4_msg(sb, KERN_WARNING,
1720 "Ignoring deprecated bh option");
1721 break;
1722 case Opt_i_version:
1723 set_opt(sbi->s_mount_opt, I_VERSION);
1724 sb->s_flags |= MS_I_VERSION;
1725 break;
1726 case Opt_nodelalloc:
1727 clear_opt(sbi->s_mount_opt, DELALLOC);
1728 break;
1729 case Opt_stripe:
1730 if (match_int(&args[0], &option))
1731 return 0;
1732 if (option < 0)
1733 return 0;
1734 sbi->s_stripe = option;
1735 break;
1736 case Opt_delalloc:
1737 set_opt(sbi->s_mount_opt, DELALLOC);
1738 break;
1739 case Opt_block_validity:
1740 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1741 break;
1742 case Opt_noblock_validity:
1743 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1744 break;
1745 case Opt_inode_readahead_blks:
1746 if (match_int(&args[0], &option))
1747 return 0;
1748 if (option < 0 || option > (1 << 30))
1749 return 0;
1750 if (!is_power_of_2(option)) {
1751 ext4_msg(sb, KERN_ERR,
1752 "EXT4-fs: inode_readahead_blks"
1753 " must be a power of 2");
1754 return 0;
1755 }
1756 sbi->s_inode_readahead_blks = option;
1757 break;
1758 case Opt_journal_ioprio:
1759 if (match_int(&args[0], &option))
1760 return 0;
1761 if (option < 0 || option > 7)
1762 break;
1763 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1764 option);
1765 break;
1766 case Opt_noauto_da_alloc:
1767 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1768 break;
1769 case Opt_auto_da_alloc:
1770 if (args[0].from) {
1771 if (match_int(&args[0], &option))
1772 return 0;
1773 } else
1774 option = 1; /* No argument, default to 1 */
1775 if (option)
1776 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1777 else
1778 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1779 break;
1780 case Opt_discard:
1781 set_opt(sbi->s_mount_opt, DISCARD);
1782 break;
1783 case Opt_nodiscard:
1784 clear_opt(sbi->s_mount_opt, DISCARD);
1785 break;
1786 case Opt_dioread_nolock:
1787 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1788 break;
1789 case Opt_dioread_lock:
1790 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1791 break;
1792 case Opt_init_inode_table:
1793 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1794 if (args[0].from) {
1795 if (match_int(&args[0], &option))
1796 return 0;
1797 } else
1798 option = EXT4_DEF_LI_WAIT_MULT;
1799 if (option < 0)
1800 return 0;
1801 sbi->s_li_wait_mult = option;
1802 break;
1803 case Opt_noinit_inode_table:
1804 clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1805 break;
1806 default:
1807 ext4_msg(sb, KERN_ERR,
1808 "Unrecognized mount option \"%s\" "
1809 "or missing value", p);
1810 return 0;
1811 }
1812 }
1813 #ifdef CONFIG_QUOTA
1814 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1815 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1816 clear_opt(sbi->s_mount_opt, USRQUOTA);
1817
1818 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1819 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1820
1821 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1822 ext4_msg(sb, KERN_ERR, "old and new quota "
1823 "format mixing");
1824 return 0;
1825 }
1826
1827 if (!sbi->s_jquota_fmt) {
1828 ext4_msg(sb, KERN_ERR, "journaled quota format "
1829 "not specified");
1830 return 0;
1831 }
1832 } else {
1833 if (sbi->s_jquota_fmt) {
1834 ext4_msg(sb, KERN_ERR, "journaled quota format "
1835 "specified with no journaling "
1836 "enabled");
1837 return 0;
1838 }
1839 }
1840 #endif
1841 return 1;
1842 }
1843
1844 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1845 int read_only)
1846 {
1847 struct ext4_sb_info *sbi = EXT4_SB(sb);
1848 int res = 0;
1849
1850 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1851 ext4_msg(sb, KERN_ERR, "revision level too high, "
1852 "forcing read-only mode");
1853 res = MS_RDONLY;
1854 }
1855 if (read_only)
1856 return res;
1857 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1858 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1859 "running e2fsck is recommended");
1860 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1861 ext4_msg(sb, KERN_WARNING,
1862 "warning: mounting fs with errors, "
1863 "running e2fsck is recommended");
1864 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1865 le16_to_cpu(es->s_mnt_count) >=
1866 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1867 ext4_msg(sb, KERN_WARNING,
1868 "warning: maximal mount count reached, "
1869 "running e2fsck is recommended");
1870 else if (le32_to_cpu(es->s_checkinterval) &&
1871 (le32_to_cpu(es->s_lastcheck) +
1872 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1873 ext4_msg(sb, KERN_WARNING,
1874 "warning: checktime reached, "
1875 "running e2fsck is recommended");
1876 if (!sbi->s_journal)
1877 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1878 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1879 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1880 le16_add_cpu(&es->s_mnt_count, 1);
1881 es->s_mtime = cpu_to_le32(get_seconds());
1882 ext4_update_dynamic_rev(sb);
1883 if (sbi->s_journal)
1884 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1885
1886 ext4_commit_super(sb, 1);
1887 if (test_opt(sb, DEBUG))
1888 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1889 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1890 sb->s_blocksize,
1891 sbi->s_groups_count,
1892 EXT4_BLOCKS_PER_GROUP(sb),
1893 EXT4_INODES_PER_GROUP(sb),
1894 sbi->s_mount_opt);
1895
1896 return res;
1897 }
1898
1899 static int ext4_fill_flex_info(struct super_block *sb)
1900 {
1901 struct ext4_sb_info *sbi = EXT4_SB(sb);
1902 struct ext4_group_desc *gdp = NULL;
1903 ext4_group_t flex_group_count;
1904 ext4_group_t flex_group;
1905 int groups_per_flex = 0;
1906 size_t size;
1907 int i;
1908
1909 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1910 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1911
1912 if (groups_per_flex < 2) {
1913 sbi->s_log_groups_per_flex = 0;
1914 return 1;
1915 }
1916
1917 /* We allocate both existing and potentially added groups */
1918 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1919 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1920 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1921 size = flex_group_count * sizeof(struct flex_groups);
1922 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1923 if (sbi->s_flex_groups == NULL) {
1924 sbi->s_flex_groups = vmalloc(size);
1925 if (sbi->s_flex_groups)
1926 memset(sbi->s_flex_groups, 0, size);
1927 }
1928 if (sbi->s_flex_groups == NULL) {
1929 ext4_msg(sb, KERN_ERR, "not enough memory for "
1930 "%u flex groups", flex_group_count);
1931 goto failed;
1932 }
1933
1934 for (i = 0; i < sbi->s_groups_count; i++) {
1935 gdp = ext4_get_group_desc(sb, i, NULL);
1936
1937 flex_group = ext4_flex_group(sbi, i);
1938 atomic_add(ext4_free_inodes_count(sb, gdp),
1939 &sbi->s_flex_groups[flex_group].free_inodes);
1940 atomic_add(ext4_free_blks_count(sb, gdp),
1941 &sbi->s_flex_groups[flex_group].free_blocks);
1942 atomic_add(ext4_used_dirs_count(sb, gdp),
1943 &sbi->s_flex_groups[flex_group].used_dirs);
1944 }
1945
1946 return 1;
1947 failed:
1948 return 0;
1949 }
1950
1951 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1952 struct ext4_group_desc *gdp)
1953 {
1954 __u16 crc = 0;
1955
1956 if (sbi->s_es->s_feature_ro_compat &
1957 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1958 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1959 __le32 le_group = cpu_to_le32(block_group);
1960
1961 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1962 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1963 crc = crc16(crc, (__u8 *)gdp, offset);
1964 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1965 /* for checksum of struct ext4_group_desc do the rest...*/
1966 if ((sbi->s_es->s_feature_incompat &
1967 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1968 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1969 crc = crc16(crc, (__u8 *)gdp + offset,
1970 le16_to_cpu(sbi->s_es->s_desc_size) -
1971 offset);
1972 }
1973
1974 return cpu_to_le16(crc);
1975 }
1976
1977 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1978 struct ext4_group_desc *gdp)
1979 {
1980 if ((sbi->s_es->s_feature_ro_compat &
1981 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1982 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1983 return 0;
1984
1985 return 1;
1986 }
1987
1988 /* Called at mount-time, super-block is locked */
1989 static int ext4_check_descriptors(struct super_block *sb,
1990 ext4_group_t *first_not_zeroed)
1991 {
1992 struct ext4_sb_info *sbi = EXT4_SB(sb);
1993 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1994 ext4_fsblk_t last_block;
1995 ext4_fsblk_t block_bitmap;
1996 ext4_fsblk_t inode_bitmap;
1997 ext4_fsblk_t inode_table;
1998 int flexbg_flag = 0;
1999 ext4_group_t i, grp = sbi->s_groups_count;
2000
2001 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2002 flexbg_flag = 1;
2003
2004 ext4_debug("Checking group descriptors");
2005
2006 for (i = 0; i < sbi->s_groups_count; i++) {
2007 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2008
2009 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2010 last_block = ext4_blocks_count(sbi->s_es) - 1;
2011 else
2012 last_block = first_block +
2013 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2014
2015 if ((grp == sbi->s_groups_count) &&
2016 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2017 grp = i;
2018
2019 block_bitmap = ext4_block_bitmap(sb, gdp);
2020 if (block_bitmap < first_block || block_bitmap > last_block) {
2021 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2022 "Block bitmap for group %u not in group "
2023 "(block %llu)!", i, block_bitmap);
2024 return 0;
2025 }
2026 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2027 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2028 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2029 "Inode bitmap for group %u not in group "
2030 "(block %llu)!", i, inode_bitmap);
2031 return 0;
2032 }
2033 inode_table = ext4_inode_table(sb, gdp);
2034 if (inode_table < first_block ||
2035 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2036 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2037 "Inode table for group %u not in group "
2038 "(block %llu)!", i, inode_table);
2039 return 0;
2040 }
2041 ext4_lock_group(sb, i);
2042 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2043 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2044 "Checksum for group %u failed (%u!=%u)",
2045 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2046 gdp)), le16_to_cpu(gdp->bg_checksum));
2047 if (!(sb->s_flags & MS_RDONLY)) {
2048 ext4_unlock_group(sb, i);
2049 return 0;
2050 }
2051 }
2052 ext4_unlock_group(sb, i);
2053 if (!flexbg_flag)
2054 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2055 }
2056 if (NULL != first_not_zeroed)
2057 *first_not_zeroed = grp;
2058
2059 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2060 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2061 return 1;
2062 }
2063
2064 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2065 * the superblock) which were deleted from all directories, but held open by
2066 * a process at the time of a crash. We walk the list and try to delete these
2067 * inodes at recovery time (only with a read-write filesystem).
2068 *
2069 * In order to keep the orphan inode chain consistent during traversal (in
2070 * case of crash during recovery), we link each inode into the superblock
2071 * orphan list_head and handle it the same way as an inode deletion during
2072 * normal operation (which journals the operations for us).
2073 *
2074 * We only do an iget() and an iput() on each inode, which is very safe if we
2075 * accidentally point at an in-use or already deleted inode. The worst that
2076 * can happen in this case is that we get a "bit already cleared" message from
2077 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2078 * e2fsck was run on this filesystem, and it must have already done the orphan
2079 * inode cleanup for us, so we can safely abort without any further action.
2080 */
2081 static void ext4_orphan_cleanup(struct super_block *sb,
2082 struct ext4_super_block *es)
2083 {
2084 unsigned int s_flags = sb->s_flags;
2085 int nr_orphans = 0, nr_truncates = 0;
2086 #ifdef CONFIG_QUOTA
2087 int i;
2088 #endif
2089 if (!es->s_last_orphan) {
2090 jbd_debug(4, "no orphan inodes to clean up\n");
2091 return;
2092 }
2093
2094 if (bdev_read_only(sb->s_bdev)) {
2095 ext4_msg(sb, KERN_ERR, "write access "
2096 "unavailable, skipping orphan cleanup");
2097 return;
2098 }
2099
2100 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2101 if (es->s_last_orphan)
2102 jbd_debug(1, "Errors on filesystem, "
2103 "clearing orphan list.\n");
2104 es->s_last_orphan = 0;
2105 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2106 return;
2107 }
2108
2109 if (s_flags & MS_RDONLY) {
2110 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2111 sb->s_flags &= ~MS_RDONLY;
2112 }
2113 #ifdef CONFIG_QUOTA
2114 /* Needed for iput() to work correctly and not trash data */
2115 sb->s_flags |= MS_ACTIVE;
2116 /* Turn on quotas so that they are updated correctly */
2117 for (i = 0; i < MAXQUOTAS; i++) {
2118 if (EXT4_SB(sb)->s_qf_names[i]) {
2119 int ret = ext4_quota_on_mount(sb, i);
2120 if (ret < 0)
2121 ext4_msg(sb, KERN_ERR,
2122 "Cannot turn on journaled "
2123 "quota: error %d", ret);
2124 }
2125 }
2126 #endif
2127
2128 while (es->s_last_orphan) {
2129 struct inode *inode;
2130
2131 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2132 if (IS_ERR(inode)) {
2133 es->s_last_orphan = 0;
2134 break;
2135 }
2136
2137 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2138 dquot_initialize(inode);
2139 if (inode->i_nlink) {
2140 ext4_msg(sb, KERN_DEBUG,
2141 "%s: truncating inode %lu to %lld bytes",
2142 __func__, inode->i_ino, inode->i_size);
2143 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2144 inode->i_ino, inode->i_size);
2145 ext4_truncate(inode);
2146 nr_truncates++;
2147 } else {
2148 ext4_msg(sb, KERN_DEBUG,
2149 "%s: deleting unreferenced inode %lu",
2150 __func__, inode->i_ino);
2151 jbd_debug(2, "deleting unreferenced inode %lu\n",
2152 inode->i_ino);
2153 nr_orphans++;
2154 }
2155 iput(inode); /* The delete magic happens here! */
2156 }
2157
2158 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2159
2160 if (nr_orphans)
2161 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2162 PLURAL(nr_orphans));
2163 if (nr_truncates)
2164 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2165 PLURAL(nr_truncates));
2166 #ifdef CONFIG_QUOTA
2167 /* Turn quotas off */
2168 for (i = 0; i < MAXQUOTAS; i++) {
2169 if (sb_dqopt(sb)->files[i])
2170 dquot_quota_off(sb, i);
2171 }
2172 #endif
2173 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2174 }
2175
2176 /*
2177 * Maximal extent format file size.
2178 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2179 * extent format containers, within a sector_t, and within i_blocks
2180 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2181 * so that won't be a limiting factor.
2182 *
2183 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2184 */
2185 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2186 {
2187 loff_t res;
2188 loff_t upper_limit = MAX_LFS_FILESIZE;
2189
2190 /* small i_blocks in vfs inode? */
2191 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2192 /*
2193 * CONFIG_LBDAF is not enabled implies the inode
2194 * i_block represent total blocks in 512 bytes
2195 * 32 == size of vfs inode i_blocks * 8
2196 */
2197 upper_limit = (1LL << 32) - 1;
2198
2199 /* total blocks in file system block size */
2200 upper_limit >>= (blkbits - 9);
2201 upper_limit <<= blkbits;
2202 }
2203
2204 /* 32-bit extent-start container, ee_block */
2205 res = 1LL << 32;
2206 res <<= blkbits;
2207 res -= 1;
2208
2209 /* Sanity check against vm- & vfs- imposed limits */
2210 if (res > upper_limit)
2211 res = upper_limit;
2212
2213 return res;
2214 }
2215
2216 /*
2217 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2218 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2219 * We need to be 1 filesystem block less than the 2^48 sector limit.
2220 */
2221 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2222 {
2223 loff_t res = EXT4_NDIR_BLOCKS;
2224 int meta_blocks;
2225 loff_t upper_limit;
2226 /* This is calculated to be the largest file size for a dense, block
2227 * mapped file such that the file's total number of 512-byte sectors,
2228 * including data and all indirect blocks, does not exceed (2^48 - 1).
2229 *
2230 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2231 * number of 512-byte sectors of the file.
2232 */
2233
2234 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2235 /*
2236 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2237 * the inode i_block field represents total file blocks in
2238 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2239 */
2240 upper_limit = (1LL << 32) - 1;
2241
2242 /* total blocks in file system block size */
2243 upper_limit >>= (bits - 9);
2244
2245 } else {
2246 /*
2247 * We use 48 bit ext4_inode i_blocks
2248 * With EXT4_HUGE_FILE_FL set the i_blocks
2249 * represent total number of blocks in
2250 * file system block size
2251 */
2252 upper_limit = (1LL << 48) - 1;
2253
2254 }
2255
2256 /* indirect blocks */
2257 meta_blocks = 1;
2258 /* double indirect blocks */
2259 meta_blocks += 1 + (1LL << (bits-2));
2260 /* tripple indirect blocks */
2261 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2262
2263 upper_limit -= meta_blocks;
2264 upper_limit <<= bits;
2265
2266 res += 1LL << (bits-2);
2267 res += 1LL << (2*(bits-2));
2268 res += 1LL << (3*(bits-2));
2269 res <<= bits;
2270 if (res > upper_limit)
2271 res = upper_limit;
2272
2273 if (res > MAX_LFS_FILESIZE)
2274 res = MAX_LFS_FILESIZE;
2275
2276 return res;
2277 }
2278
2279 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2280 ext4_fsblk_t logical_sb_block, int nr)
2281 {
2282 struct ext4_sb_info *sbi = EXT4_SB(sb);
2283 ext4_group_t bg, first_meta_bg;
2284 int has_super = 0;
2285
2286 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2287
2288 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2289 nr < first_meta_bg)
2290 return logical_sb_block + nr + 1;
2291 bg = sbi->s_desc_per_block * nr;
2292 if (ext4_bg_has_super(sb, bg))
2293 has_super = 1;
2294
2295 return (has_super + ext4_group_first_block_no(sb, bg));
2296 }
2297
2298 /**
2299 * ext4_get_stripe_size: Get the stripe size.
2300 * @sbi: In memory super block info
2301 *
2302 * If we have specified it via mount option, then
2303 * use the mount option value. If the value specified at mount time is
2304 * greater than the blocks per group use the super block value.
2305 * If the super block value is greater than blocks per group return 0.
2306 * Allocator needs it be less than blocks per group.
2307 *
2308 */
2309 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2310 {
2311 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2312 unsigned long stripe_width =
2313 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2314
2315 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2316 return sbi->s_stripe;
2317
2318 if (stripe_width <= sbi->s_blocks_per_group)
2319 return stripe_width;
2320
2321 if (stride <= sbi->s_blocks_per_group)
2322 return stride;
2323
2324 return 0;
2325 }
2326
2327 /* sysfs supprt */
2328
2329 struct ext4_attr {
2330 struct attribute attr;
2331 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2332 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2333 const char *, size_t);
2334 int offset;
2335 };
2336
2337 static int parse_strtoul(const char *buf,
2338 unsigned long max, unsigned long *value)
2339 {
2340 char *endp;
2341
2342 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2343 endp = skip_spaces(endp);
2344 if (*endp || *value > max)
2345 return -EINVAL;
2346
2347 return 0;
2348 }
2349
2350 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2351 struct ext4_sb_info *sbi,
2352 char *buf)
2353 {
2354 return snprintf(buf, PAGE_SIZE, "%llu\n",
2355 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2356 }
2357
2358 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2359 struct ext4_sb_info *sbi, char *buf)
2360 {
2361 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2362
2363 if (!sb->s_bdev->bd_part)
2364 return snprintf(buf, PAGE_SIZE, "0\n");
2365 return snprintf(buf, PAGE_SIZE, "%lu\n",
2366 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2367 sbi->s_sectors_written_start) >> 1);
2368 }
2369
2370 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2371 struct ext4_sb_info *sbi, char *buf)
2372 {
2373 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2374
2375 if (!sb->s_bdev->bd_part)
2376 return snprintf(buf, PAGE_SIZE, "0\n");
2377 return snprintf(buf, PAGE_SIZE, "%llu\n",
2378 (unsigned long long)(sbi->s_kbytes_written +
2379 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2380 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2381 }
2382
2383 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2384 struct ext4_sb_info *sbi,
2385 const char *buf, size_t count)
2386 {
2387 unsigned long t;
2388
2389 if (parse_strtoul(buf, 0x40000000, &t))
2390 return -EINVAL;
2391
2392 if (!is_power_of_2(t))
2393 return -EINVAL;
2394
2395 sbi->s_inode_readahead_blks = t;
2396 return count;
2397 }
2398
2399 static ssize_t sbi_ui_show(struct ext4_attr *a,
2400 struct ext4_sb_info *sbi, char *buf)
2401 {
2402 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2403
2404 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2405 }
2406
2407 static ssize_t sbi_ui_store(struct ext4_attr *a,
2408 struct ext4_sb_info *sbi,
2409 const char *buf, size_t count)
2410 {
2411 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2412 unsigned long t;
2413
2414 if (parse_strtoul(buf, 0xffffffff, &t))
2415 return -EINVAL;
2416 *ui = t;
2417 return count;
2418 }
2419
2420 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2421 static struct ext4_attr ext4_attr_##_name = { \
2422 .attr = {.name = __stringify(_name), .mode = _mode }, \
2423 .show = _show, \
2424 .store = _store, \
2425 .offset = offsetof(struct ext4_sb_info, _elname), \
2426 }
2427 #define EXT4_ATTR(name, mode, show, store) \
2428 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2429
2430 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2431 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2432 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2433 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2434 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2435 #define ATTR_LIST(name) &ext4_attr_##name.attr
2436
2437 EXT4_RO_ATTR(delayed_allocation_blocks);
2438 EXT4_RO_ATTR(session_write_kbytes);
2439 EXT4_RO_ATTR(lifetime_write_kbytes);
2440 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2441 inode_readahead_blks_store, s_inode_readahead_blks);
2442 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2443 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2444 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2445 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2446 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2447 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2448 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2449 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2450
2451 static struct attribute *ext4_attrs[] = {
2452 ATTR_LIST(delayed_allocation_blocks),
2453 ATTR_LIST(session_write_kbytes),
2454 ATTR_LIST(lifetime_write_kbytes),
2455 ATTR_LIST(inode_readahead_blks),
2456 ATTR_LIST(inode_goal),
2457 ATTR_LIST(mb_stats),
2458 ATTR_LIST(mb_max_to_scan),
2459 ATTR_LIST(mb_min_to_scan),
2460 ATTR_LIST(mb_order2_req),
2461 ATTR_LIST(mb_stream_req),
2462 ATTR_LIST(mb_group_prealloc),
2463 ATTR_LIST(max_writeback_mb_bump),
2464 NULL,
2465 };
2466
2467 /* Features this copy of ext4 supports */
2468 EXT4_INFO_ATTR(lazy_itable_init);
2469 EXT4_INFO_ATTR(batched_discard);
2470
2471 static struct attribute *ext4_feat_attrs[] = {
2472 ATTR_LIST(lazy_itable_init),
2473 ATTR_LIST(batched_discard),
2474 NULL,
2475 };
2476
2477 static ssize_t ext4_attr_show(struct kobject *kobj,
2478 struct attribute *attr, char *buf)
2479 {
2480 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2481 s_kobj);
2482 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2483
2484 return a->show ? a->show(a, sbi, buf) : 0;
2485 }
2486
2487 static ssize_t ext4_attr_store(struct kobject *kobj,
2488 struct attribute *attr,
2489 const char *buf, size_t len)
2490 {
2491 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2492 s_kobj);
2493 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2494
2495 return a->store ? a->store(a, sbi, buf, len) : 0;
2496 }
2497
2498 static void ext4_sb_release(struct kobject *kobj)
2499 {
2500 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2501 s_kobj);
2502 complete(&sbi->s_kobj_unregister);
2503 }
2504
2505 static const struct sysfs_ops ext4_attr_ops = {
2506 .show = ext4_attr_show,
2507 .store = ext4_attr_store,
2508 };
2509
2510 static struct kobj_type ext4_ktype = {
2511 .default_attrs = ext4_attrs,
2512 .sysfs_ops = &ext4_attr_ops,
2513 .release = ext4_sb_release,
2514 };
2515
2516 static void ext4_feat_release(struct kobject *kobj)
2517 {
2518 complete(&ext4_feat->f_kobj_unregister);
2519 }
2520
2521 static struct kobj_type ext4_feat_ktype = {
2522 .default_attrs = ext4_feat_attrs,
2523 .sysfs_ops = &ext4_attr_ops,
2524 .release = ext4_feat_release,
2525 };
2526
2527 /*
2528 * Check whether this filesystem can be mounted based on
2529 * the features present and the RDONLY/RDWR mount requested.
2530 * Returns 1 if this filesystem can be mounted as requested,
2531 * 0 if it cannot be.
2532 */
2533 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2534 {
2535 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2536 ext4_msg(sb, KERN_ERR,
2537 "Couldn't mount because of "
2538 "unsupported optional features (%x)",
2539 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2540 ~EXT4_FEATURE_INCOMPAT_SUPP));
2541 return 0;
2542 }
2543
2544 if (readonly)
2545 return 1;
2546
2547 /* Check that feature set is OK for a read-write mount */
2548 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2549 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2550 "unsupported optional features (%x)",
2551 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2552 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2553 return 0;
2554 }
2555 /*
2556 * Large file size enabled file system can only be mounted
2557 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2558 */
2559 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2560 if (sizeof(blkcnt_t) < sizeof(u64)) {
2561 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2562 "cannot be mounted RDWR without "
2563 "CONFIG_LBDAF");
2564 return 0;
2565 }
2566 }
2567 return 1;
2568 }
2569
2570 /*
2571 * This function is called once a day if we have errors logged
2572 * on the file system
2573 */
2574 static void print_daily_error_info(unsigned long arg)
2575 {
2576 struct super_block *sb = (struct super_block *) arg;
2577 struct ext4_sb_info *sbi;
2578 struct ext4_super_block *es;
2579
2580 sbi = EXT4_SB(sb);
2581 es = sbi->s_es;
2582
2583 if (es->s_error_count)
2584 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2585 le32_to_cpu(es->s_error_count));
2586 if (es->s_first_error_time) {
2587 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2588 sb->s_id, le32_to_cpu(es->s_first_error_time),
2589 (int) sizeof(es->s_first_error_func),
2590 es->s_first_error_func,
2591 le32_to_cpu(es->s_first_error_line));
2592 if (es->s_first_error_ino)
2593 printk(": inode %u",
2594 le32_to_cpu(es->s_first_error_ino));
2595 if (es->s_first_error_block)
2596 printk(": block %llu", (unsigned long long)
2597 le64_to_cpu(es->s_first_error_block));
2598 printk("\n");
2599 }
2600 if (es->s_last_error_time) {
2601 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2602 sb->s_id, le32_to_cpu(es->s_last_error_time),
2603 (int) sizeof(es->s_last_error_func),
2604 es->s_last_error_func,
2605 le32_to_cpu(es->s_last_error_line));
2606 if (es->s_last_error_ino)
2607 printk(": inode %u",
2608 le32_to_cpu(es->s_last_error_ino));
2609 if (es->s_last_error_block)
2610 printk(": block %llu", (unsigned long long)
2611 le64_to_cpu(es->s_last_error_block));
2612 printk("\n");
2613 }
2614 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2615 }
2616
2617 static void ext4_lazyinode_timeout(unsigned long data)
2618 {
2619 struct task_struct *p = (struct task_struct *)data;
2620 wake_up_process(p);
2621 }
2622
2623 /* Find next suitable group and run ext4_init_inode_table */
2624 static int ext4_run_li_request(struct ext4_li_request *elr)
2625 {
2626 struct ext4_group_desc *gdp = NULL;
2627 ext4_group_t group, ngroups;
2628 struct super_block *sb;
2629 unsigned long timeout = 0;
2630 int ret = 0;
2631
2632 sb = elr->lr_super;
2633 ngroups = EXT4_SB(sb)->s_groups_count;
2634
2635 for (group = elr->lr_next_group; group < ngroups; group++) {
2636 gdp = ext4_get_group_desc(sb, group, NULL);
2637 if (!gdp) {
2638 ret = 1;
2639 break;
2640 }
2641
2642 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2643 break;
2644 }
2645
2646 if (group == ngroups)
2647 ret = 1;
2648
2649 if (!ret) {
2650 timeout = jiffies;
2651 ret = ext4_init_inode_table(sb, group,
2652 elr->lr_timeout ? 0 : 1);
2653 if (elr->lr_timeout == 0) {
2654 timeout = jiffies - timeout;
2655 if (elr->lr_sbi->s_li_wait_mult)
2656 timeout *= elr->lr_sbi->s_li_wait_mult;
2657 else
2658 timeout *= 20;
2659 elr->lr_timeout = timeout;
2660 }
2661 elr->lr_next_sched = jiffies + elr->lr_timeout;
2662 elr->lr_next_group = group + 1;
2663 }
2664
2665 return ret;
2666 }
2667
2668 /*
2669 * Remove lr_request from the list_request and free the
2670 * request tructure. Should be called with li_list_mtx held
2671 */
2672 static void ext4_remove_li_request(struct ext4_li_request *elr)
2673 {
2674 struct ext4_sb_info *sbi;
2675
2676 if (!elr)
2677 return;
2678
2679 sbi = elr->lr_sbi;
2680
2681 list_del(&elr->lr_request);
2682 sbi->s_li_request = NULL;
2683 kfree(elr);
2684 }
2685
2686 static void ext4_unregister_li_request(struct super_block *sb)
2687 {
2688 struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request;
2689
2690 if (!ext4_li_info)
2691 return;
2692
2693 mutex_lock(&ext4_li_info->li_list_mtx);
2694 ext4_remove_li_request(elr);
2695 mutex_unlock(&ext4_li_info->li_list_mtx);
2696 }
2697
2698 /*
2699 * This is the function where ext4lazyinit thread lives. It walks
2700 * through the request list searching for next scheduled filesystem.
2701 * When such a fs is found, run the lazy initialization request
2702 * (ext4_rn_li_request) and keep track of the time spend in this
2703 * function. Based on that time we compute next schedule time of
2704 * the request. When walking through the list is complete, compute
2705 * next waking time and put itself into sleep.
2706 */
2707 static int ext4_lazyinit_thread(void *arg)
2708 {
2709 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2710 struct list_head *pos, *n;
2711 struct ext4_li_request *elr;
2712 unsigned long next_wakeup;
2713 DEFINE_WAIT(wait);
2714
2715 BUG_ON(NULL == eli);
2716
2717 eli->li_timer.data = (unsigned long)current;
2718 eli->li_timer.function = ext4_lazyinode_timeout;
2719
2720 eli->li_task = current;
2721 wake_up(&eli->li_wait_task);
2722
2723 cont_thread:
2724 while (true) {
2725 next_wakeup = MAX_JIFFY_OFFSET;
2726
2727 mutex_lock(&eli->li_list_mtx);
2728 if (list_empty(&eli->li_request_list)) {
2729 mutex_unlock(&eli->li_list_mtx);
2730 goto exit_thread;
2731 }
2732
2733 list_for_each_safe(pos, n, &eli->li_request_list) {
2734 elr = list_entry(pos, struct ext4_li_request,
2735 lr_request);
2736
2737 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2738 if (ext4_run_li_request(elr) != 0) {
2739 /* error, remove the lazy_init job */
2740 ext4_remove_li_request(elr);
2741 continue;
2742 }
2743 }
2744
2745 if (time_before(elr->lr_next_sched, next_wakeup))
2746 next_wakeup = elr->lr_next_sched;
2747 }
2748 mutex_unlock(&eli->li_list_mtx);
2749
2750 if (freezing(current))
2751 refrigerator();
2752
2753 if ((time_after_eq(jiffies, next_wakeup)) ||
2754 (MAX_JIFFY_OFFSET == next_wakeup)) {
2755 cond_resched();
2756 continue;
2757 }
2758
2759 eli->li_timer.expires = next_wakeup;
2760 add_timer(&eli->li_timer);
2761 prepare_to_wait(&eli->li_wait_daemon, &wait,
2762 TASK_INTERRUPTIBLE);
2763 if (time_before(jiffies, next_wakeup))
2764 schedule();
2765 finish_wait(&eli->li_wait_daemon, &wait);
2766 }
2767
2768 exit_thread:
2769 /*
2770 * It looks like the request list is empty, but we need
2771 * to check it under the li_list_mtx lock, to prevent any
2772 * additions into it, and of course we should lock ext4_li_mtx
2773 * to atomically free the list and ext4_li_info, because at
2774 * this point another ext4 filesystem could be registering
2775 * new one.
2776 */
2777 mutex_lock(&ext4_li_mtx);
2778 mutex_lock(&eli->li_list_mtx);
2779 if (!list_empty(&eli->li_request_list)) {
2780 mutex_unlock(&eli->li_list_mtx);
2781 mutex_unlock(&ext4_li_mtx);
2782 goto cont_thread;
2783 }
2784 mutex_unlock(&eli->li_list_mtx);
2785 del_timer_sync(&ext4_li_info->li_timer);
2786 eli->li_task = NULL;
2787 wake_up(&eli->li_wait_task);
2788
2789 kfree(ext4_li_info);
2790 ext4_li_info = NULL;
2791 mutex_unlock(&ext4_li_mtx);
2792
2793 return 0;
2794 }
2795
2796 static void ext4_clear_request_list(void)
2797 {
2798 struct list_head *pos, *n;
2799 struct ext4_li_request *elr;
2800
2801 mutex_lock(&ext4_li_info->li_list_mtx);
2802 if (list_empty(&ext4_li_info->li_request_list))
2803 return;
2804
2805 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2806 elr = list_entry(pos, struct ext4_li_request,
2807 lr_request);
2808 ext4_remove_li_request(elr);
2809 }
2810 mutex_unlock(&ext4_li_info->li_list_mtx);
2811 }
2812
2813 static int ext4_run_lazyinit_thread(void)
2814 {
2815 struct task_struct *t;
2816
2817 t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
2818 if (IS_ERR(t)) {
2819 int err = PTR_ERR(t);
2820 ext4_clear_request_list();
2821 del_timer_sync(&ext4_li_info->li_timer);
2822 kfree(ext4_li_info);
2823 ext4_li_info = NULL;
2824 printk(KERN_CRIT "EXT4: error %d creating inode table "
2825 "initialization thread\n",
2826 err);
2827 return err;
2828 }
2829 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2830
2831 wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL);
2832 return 0;
2833 }
2834
2835 /*
2836 * Check whether it make sense to run itable init. thread or not.
2837 * If there is at least one uninitialized inode table, return
2838 * corresponding group number, else the loop goes through all
2839 * groups and return total number of groups.
2840 */
2841 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2842 {
2843 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2844 struct ext4_group_desc *gdp = NULL;
2845
2846 for (group = 0; group < ngroups; group++) {
2847 gdp = ext4_get_group_desc(sb, group, NULL);
2848 if (!gdp)
2849 continue;
2850
2851 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2852 break;
2853 }
2854
2855 return group;
2856 }
2857
2858 static int ext4_li_info_new(void)
2859 {
2860 struct ext4_lazy_init *eli = NULL;
2861
2862 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2863 if (!eli)
2864 return -ENOMEM;
2865
2866 eli->li_task = NULL;
2867 INIT_LIST_HEAD(&eli->li_request_list);
2868 mutex_init(&eli->li_list_mtx);
2869
2870 init_waitqueue_head(&eli->li_wait_daemon);
2871 init_waitqueue_head(&eli->li_wait_task);
2872 init_timer(&eli->li_timer);
2873 eli->li_state |= EXT4_LAZYINIT_QUIT;
2874
2875 ext4_li_info = eli;
2876
2877 return 0;
2878 }
2879
2880 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2881 ext4_group_t start)
2882 {
2883 struct ext4_sb_info *sbi = EXT4_SB(sb);
2884 struct ext4_li_request *elr;
2885 unsigned long rnd;
2886
2887 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2888 if (!elr)
2889 return NULL;
2890
2891 elr->lr_super = sb;
2892 elr->lr_sbi = sbi;
2893 elr->lr_next_group = start;
2894
2895 /*
2896 * Randomize first schedule time of the request to
2897 * spread the inode table initialization requests
2898 * better.
2899 */
2900 get_random_bytes(&rnd, sizeof(rnd));
2901 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2902 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2903
2904 return elr;
2905 }
2906
2907 static int ext4_register_li_request(struct super_block *sb,
2908 ext4_group_t first_not_zeroed)
2909 {
2910 struct ext4_sb_info *sbi = EXT4_SB(sb);
2911 struct ext4_li_request *elr;
2912 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2913 int ret;
2914
2915 if (sbi->s_li_request != NULL)
2916 return 0;
2917
2918 if (first_not_zeroed == ngroups ||
2919 (sb->s_flags & MS_RDONLY) ||
2920 !test_opt(sb, INIT_INODE_TABLE)) {
2921 sbi->s_li_request = NULL;
2922 return 0;
2923 }
2924
2925 if (first_not_zeroed == ngroups) {
2926 sbi->s_li_request = NULL;
2927 return 0;
2928 }
2929
2930 elr = ext4_li_request_new(sb, first_not_zeroed);
2931 if (!elr)
2932 return -ENOMEM;
2933
2934 mutex_lock(&ext4_li_mtx);
2935
2936 if (NULL == ext4_li_info) {
2937 ret = ext4_li_info_new();
2938 if (ret)
2939 goto out;
2940 }
2941
2942 mutex_lock(&ext4_li_info->li_list_mtx);
2943 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2944 mutex_unlock(&ext4_li_info->li_list_mtx);
2945
2946 sbi->s_li_request = elr;
2947
2948 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2949 ret = ext4_run_lazyinit_thread();
2950 if (ret)
2951 goto out;
2952 }
2953 out:
2954 mutex_unlock(&ext4_li_mtx);
2955 if (ret)
2956 kfree(elr);
2957 return ret;
2958 }
2959
2960 /*
2961 * We do not need to lock anything since this is called on
2962 * module unload.
2963 */
2964 static void ext4_destroy_lazyinit_thread(void)
2965 {
2966 /*
2967 * If thread exited earlier
2968 * there's nothing to be done.
2969 */
2970 if (!ext4_li_info)
2971 return;
2972
2973 ext4_clear_request_list();
2974
2975 while (ext4_li_info->li_task) {
2976 wake_up(&ext4_li_info->li_wait_daemon);
2977 wait_event(ext4_li_info->li_wait_task,
2978 ext4_li_info->li_task == NULL);
2979 }
2980 }
2981
2982 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2983 __releases(kernel_lock)
2984 __acquires(kernel_lock)
2985 {
2986 char *orig_data = kstrdup(data, GFP_KERNEL);
2987 struct buffer_head *bh;
2988 struct ext4_super_block *es = NULL;
2989 struct ext4_sb_info *sbi;
2990 ext4_fsblk_t block;
2991 ext4_fsblk_t sb_block = get_sb_block(&data);
2992 ext4_fsblk_t logical_sb_block;
2993 unsigned long offset = 0;
2994 unsigned long journal_devnum = 0;
2995 unsigned long def_mount_opts;
2996 struct inode *root;
2997 char *cp;
2998 const char *descr;
2999 int ret = -ENOMEM;
3000 int blocksize;
3001 unsigned int db_count;
3002 unsigned int i;
3003 int needs_recovery, has_huge_files;
3004 __u64 blocks_count;
3005 int err;
3006 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3007 ext4_group_t first_not_zeroed;
3008
3009 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3010 if (!sbi)
3011 goto out_free_orig;
3012
3013 sbi->s_blockgroup_lock =
3014 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3015 if (!sbi->s_blockgroup_lock) {
3016 kfree(sbi);
3017 goto out_free_orig;
3018 }
3019 sb->s_fs_info = sbi;
3020 sbi->s_mount_opt = 0;
3021 sbi->s_resuid = EXT4_DEF_RESUID;
3022 sbi->s_resgid = EXT4_DEF_RESGID;
3023 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3024 sbi->s_sb_block = sb_block;
3025 if (sb->s_bdev->bd_part)
3026 sbi->s_sectors_written_start =
3027 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3028
3029 /* Cleanup superblock name */
3030 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3031 *cp = '!';
3032
3033 ret = -EINVAL;
3034 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3035 if (!blocksize) {
3036 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3037 goto out_fail;
3038 }
3039
3040 /*
3041 * The ext4 superblock will not be buffer aligned for other than 1kB
3042 * block sizes. We need to calculate the offset from buffer start.
3043 */
3044 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3045 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3046 offset = do_div(logical_sb_block, blocksize);
3047 } else {
3048 logical_sb_block = sb_block;
3049 }
3050
3051 if (!(bh = sb_bread(sb, logical_sb_block))) {
3052 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3053 goto out_fail;
3054 }
3055 /*
3056 * Note: s_es must be initialized as soon as possible because
3057 * some ext4 macro-instructions depend on its value
3058 */
3059 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3060 sbi->s_es = es;
3061 sb->s_magic = le16_to_cpu(es->s_magic);
3062 if (sb->s_magic != EXT4_SUPER_MAGIC)
3063 goto cantfind_ext4;
3064 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3065
3066 /* Set defaults before we parse the mount options */
3067 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3068 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
3069 if (def_mount_opts & EXT4_DEFM_DEBUG)
3070 set_opt(sbi->s_mount_opt, DEBUG);
3071 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3072 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3073 "2.6.38");
3074 set_opt(sbi->s_mount_opt, GRPID);
3075 }
3076 if (def_mount_opts & EXT4_DEFM_UID16)
3077 set_opt(sbi->s_mount_opt, NO_UID32);
3078 #ifdef CONFIG_EXT4_FS_XATTR
3079 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
3080 set_opt(sbi->s_mount_opt, XATTR_USER);
3081 #endif
3082 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3083 if (def_mount_opts & EXT4_DEFM_ACL)
3084 set_opt(sbi->s_mount_opt, POSIX_ACL);
3085 #endif
3086 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3087 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3088 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3089 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3090 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3091 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3092
3093 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3094 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
3095 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3096 set_opt(sbi->s_mount_opt, ERRORS_CONT);
3097 else
3098 set_opt(sbi->s_mount_opt, ERRORS_RO);
3099 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3100 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
3101 if (def_mount_opts & EXT4_DEFM_DISCARD)
3102 set_opt(sbi->s_mount_opt, DISCARD);
3103
3104 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3105 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3106 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3107 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3108 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3109
3110 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3111 set_opt(sbi->s_mount_opt, BARRIER);
3112
3113 /*
3114 * enable delayed allocation by default
3115 * Use -o nodelalloc to turn it off
3116 */
3117 if (!IS_EXT3_SB(sb) &&
3118 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3119 set_opt(sbi->s_mount_opt, DELALLOC);
3120
3121 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3122 &journal_devnum, &journal_ioprio, NULL, 0)) {
3123 ext4_msg(sb, KERN_WARNING,
3124 "failed to parse options in superblock: %s",
3125 sbi->s_es->s_mount_opts);
3126 }
3127 if (!parse_options((char *) data, sb, &journal_devnum,
3128 &journal_ioprio, NULL, 0))
3129 goto failed_mount;
3130
3131 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3132 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3133
3134 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3135 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3136 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3137 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3138 ext4_msg(sb, KERN_WARNING,
3139 "feature flags set on rev 0 fs, "
3140 "running e2fsck is recommended");
3141
3142 /*
3143 * Check feature flags regardless of the revision level, since we
3144 * previously didn't change the revision level when setting the flags,
3145 * so there is a chance incompat flags are set on a rev 0 filesystem.
3146 */
3147 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3148 goto failed_mount;
3149
3150 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3151
3152 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3153 blocksize > EXT4_MAX_BLOCK_SIZE) {
3154 ext4_msg(sb, KERN_ERR,
3155 "Unsupported filesystem blocksize %d", blocksize);
3156 goto failed_mount;
3157 }
3158
3159 if (sb->s_blocksize != blocksize) {
3160 /* Validate the filesystem blocksize */
3161 if (!sb_set_blocksize(sb, blocksize)) {
3162 ext4_msg(sb, KERN_ERR, "bad block size %d",
3163 blocksize);
3164 goto failed_mount;
3165 }
3166
3167 brelse(bh);
3168 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3169 offset = do_div(logical_sb_block, blocksize);
3170 bh = sb_bread(sb, logical_sb_block);
3171 if (!bh) {
3172 ext4_msg(sb, KERN_ERR,
3173 "Can't read superblock on 2nd try");
3174 goto failed_mount;
3175 }
3176 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3177 sbi->s_es = es;
3178 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3179 ext4_msg(sb, KERN_ERR,
3180 "Magic mismatch, very weird!");
3181 goto failed_mount;
3182 }
3183 }
3184
3185 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3186 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3187 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3188 has_huge_files);
3189 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3190
3191 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3192 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3193 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3194 } else {
3195 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3196 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3197 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3198 (!is_power_of_2(sbi->s_inode_size)) ||
3199 (sbi->s_inode_size > blocksize)) {
3200 ext4_msg(sb, KERN_ERR,
3201 "unsupported inode size: %d",
3202 sbi->s_inode_size);
3203 goto failed_mount;
3204 }
3205 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3206 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3207 }
3208
3209 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3210 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3211 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3212 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3213 !is_power_of_2(sbi->s_desc_size)) {
3214 ext4_msg(sb, KERN_ERR,
3215 "unsupported descriptor size %lu",
3216 sbi->s_desc_size);
3217 goto failed_mount;
3218 }
3219 } else
3220 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3221
3222 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3223 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3224 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3225 goto cantfind_ext4;
3226
3227 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3228 if (sbi->s_inodes_per_block == 0)
3229 goto cantfind_ext4;
3230 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3231 sbi->s_inodes_per_block;
3232 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3233 sbi->s_sbh = bh;
3234 sbi->s_mount_state = le16_to_cpu(es->s_state);
3235 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3236 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3237
3238 for (i = 0; i < 4; i++)
3239 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3240 sbi->s_def_hash_version = es->s_def_hash_version;
3241 i = le32_to_cpu(es->s_flags);
3242 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3243 sbi->s_hash_unsigned = 3;
3244 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3245 #ifdef __CHAR_UNSIGNED__
3246 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3247 sbi->s_hash_unsigned = 3;
3248 #else
3249 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3250 #endif
3251 sb->s_dirt = 1;
3252 }
3253
3254 if (sbi->s_blocks_per_group > blocksize * 8) {
3255 ext4_msg(sb, KERN_ERR,
3256 "#blocks per group too big: %lu",
3257 sbi->s_blocks_per_group);
3258 goto failed_mount;
3259 }
3260 if (sbi->s_inodes_per_group > blocksize * 8) {
3261 ext4_msg(sb, KERN_ERR,
3262 "#inodes per group too big: %lu",
3263 sbi->s_inodes_per_group);
3264 goto failed_mount;
3265 }
3266
3267 /*
3268 * Test whether we have more sectors than will fit in sector_t,
3269 * and whether the max offset is addressable by the page cache.
3270 */
3271 ret = generic_check_addressable(sb->s_blocksize_bits,
3272 ext4_blocks_count(es));
3273 if (ret) {
3274 ext4_msg(sb, KERN_ERR, "filesystem"
3275 " too large to mount safely on this system");
3276 if (sizeof(sector_t) < 8)
3277 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3278 goto failed_mount;
3279 }
3280
3281 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3282 goto cantfind_ext4;
3283
3284 /* check blocks count against device size */
3285 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3286 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3287 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3288 "exceeds size of device (%llu blocks)",
3289 ext4_blocks_count(es), blocks_count);
3290 goto failed_mount;
3291 }
3292
3293 /*
3294 * It makes no sense for the first data block to be beyond the end
3295 * of the filesystem.
3296 */
3297 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3298 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3299 "block %u is beyond end of filesystem (%llu)",
3300 le32_to_cpu(es->s_first_data_block),
3301 ext4_blocks_count(es));
3302 goto failed_mount;
3303 }
3304 blocks_count = (ext4_blocks_count(es) -
3305 le32_to_cpu(es->s_first_data_block) +
3306 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3307 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3308 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3309 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3310 "(block count %llu, first data block %u, "
3311 "blocks per group %lu)", sbi->s_groups_count,
3312 ext4_blocks_count(es),
3313 le32_to_cpu(es->s_first_data_block),
3314 EXT4_BLOCKS_PER_GROUP(sb));
3315 goto failed_mount;
3316 }
3317 sbi->s_groups_count = blocks_count;
3318 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3319 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3320 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3321 EXT4_DESC_PER_BLOCK(sb);
3322 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
3323 GFP_KERNEL);
3324 if (sbi->s_group_desc == NULL) {
3325 ext4_msg(sb, KERN_ERR, "not enough memory");
3326 goto failed_mount;
3327 }
3328
3329 #ifdef CONFIG_PROC_FS
3330 if (ext4_proc_root)
3331 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3332 #endif
3333
3334 bgl_lock_init(sbi->s_blockgroup_lock);
3335
3336 for (i = 0; i < db_count; i++) {
3337 block = descriptor_loc(sb, logical_sb_block, i);
3338 sbi->s_group_desc[i] = sb_bread(sb, block);
3339 if (!sbi->s_group_desc[i]) {
3340 ext4_msg(sb, KERN_ERR,
3341 "can't read group descriptor %d", i);
3342 db_count = i;
3343 goto failed_mount2;
3344 }
3345 }
3346 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3347 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3348 goto failed_mount2;
3349 }
3350 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3351 if (!ext4_fill_flex_info(sb)) {
3352 ext4_msg(sb, KERN_ERR,
3353 "unable to initialize "
3354 "flex_bg meta info!");
3355 goto failed_mount2;
3356 }
3357
3358 sbi->s_gdb_count = db_count;
3359 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3360 spin_lock_init(&sbi->s_next_gen_lock);
3361
3362 err = percpu_counter_init(&sbi->s_freeblocks_counter,
3363 ext4_count_free_blocks(sb));
3364 if (!err) {
3365 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3366 ext4_count_free_inodes(sb));
3367 }
3368 if (!err) {
3369 err = percpu_counter_init(&sbi->s_dirs_counter,
3370 ext4_count_dirs(sb));
3371 }
3372 if (!err) {
3373 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3374 }
3375 if (err) {
3376 ext4_msg(sb, KERN_ERR, "insufficient memory");
3377 goto failed_mount3;
3378 }
3379
3380 sbi->s_stripe = ext4_get_stripe_size(sbi);
3381 sbi->s_max_writeback_mb_bump = 128;
3382
3383 /*
3384 * set up enough so that it can read an inode
3385 */
3386 if (!test_opt(sb, NOLOAD) &&
3387 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3388 sb->s_op = &ext4_sops;
3389 else
3390 sb->s_op = &ext4_nojournal_sops;
3391 sb->s_export_op = &ext4_export_ops;
3392 sb->s_xattr = ext4_xattr_handlers;
3393 #ifdef CONFIG_QUOTA
3394 sb->s_qcop = &ext4_qctl_operations;
3395 sb->dq_op = &ext4_quota_operations;
3396 #endif
3397 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3398 mutex_init(&sbi->s_orphan_lock);
3399 mutex_init(&sbi->s_resize_lock);
3400
3401 sb->s_root = NULL;
3402
3403 needs_recovery = (es->s_last_orphan != 0 ||
3404 EXT4_HAS_INCOMPAT_FEATURE(sb,
3405 EXT4_FEATURE_INCOMPAT_RECOVER));
3406
3407 /*
3408 * The first inode we look at is the journal inode. Don't try
3409 * root first: it may be modified in the journal!
3410 */
3411 if (!test_opt(sb, NOLOAD) &&
3412 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3413 if (ext4_load_journal(sb, es, journal_devnum))
3414 goto failed_mount3;
3415 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3416 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3417 ext4_msg(sb, KERN_ERR, "required journal recovery "
3418 "suppressed and not mounted read-only");
3419 goto failed_mount_wq;
3420 } else {
3421 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
3422 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3423 sbi->s_journal = NULL;
3424 needs_recovery = 0;
3425 goto no_journal;
3426 }
3427
3428 if (ext4_blocks_count(es) > 0xffffffffULL &&
3429 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3430 JBD2_FEATURE_INCOMPAT_64BIT)) {
3431 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3432 goto failed_mount_wq;
3433 }
3434
3435 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3436 jbd2_journal_set_features(sbi->s_journal,
3437 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3438 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3439 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3440 jbd2_journal_set_features(sbi->s_journal,
3441 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3442 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3443 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3444 } else {
3445 jbd2_journal_clear_features(sbi->s_journal,
3446 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3447 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3448 }
3449
3450 /* We have now updated the journal if required, so we can
3451 * validate the data journaling mode. */
3452 switch (test_opt(sb, DATA_FLAGS)) {
3453 case 0:
3454 /* No mode set, assume a default based on the journal
3455 * capabilities: ORDERED_DATA if the journal can
3456 * cope, else JOURNAL_DATA
3457 */
3458 if (jbd2_journal_check_available_features
3459 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3460 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3461 else
3462 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3463 break;
3464
3465 case EXT4_MOUNT_ORDERED_DATA:
3466 case EXT4_MOUNT_WRITEBACK_DATA:
3467 if (!jbd2_journal_check_available_features
3468 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3469 ext4_msg(sb, KERN_ERR, "Journal does not support "
3470 "requested data journaling mode");
3471 goto failed_mount_wq;
3472 }
3473 default:
3474 break;
3475 }
3476 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3477
3478 /*
3479 * The journal may have updated the bg summary counts, so we
3480 * need to update the global counters.
3481 */
3482 percpu_counter_set(&sbi->s_freeblocks_counter,
3483 ext4_count_free_blocks(sb));
3484 percpu_counter_set(&sbi->s_freeinodes_counter,
3485 ext4_count_free_inodes(sb));
3486 percpu_counter_set(&sbi->s_dirs_counter,
3487 ext4_count_dirs(sb));
3488 percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
3489
3490 no_journal:
3491 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
3492 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3493 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3494 goto failed_mount_wq;
3495 }
3496
3497 /*
3498 * The jbd2_journal_load will have done any necessary log recovery,
3499 * so we can safely mount the rest of the filesystem now.
3500 */
3501
3502 root = ext4_iget(sb, EXT4_ROOT_INO);
3503 if (IS_ERR(root)) {
3504 ext4_msg(sb, KERN_ERR, "get root inode failed");
3505 ret = PTR_ERR(root);
3506 goto failed_mount4;
3507 }
3508 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3509 iput(root);
3510 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3511 goto failed_mount4;
3512 }
3513 sb->s_root = d_alloc_root(root);
3514 if (!sb->s_root) {
3515 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3516 iput(root);
3517 ret = -ENOMEM;
3518 goto failed_mount4;
3519 }
3520
3521 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3522
3523 /* determine the minimum size of new large inodes, if present */
3524 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3525 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3526 EXT4_GOOD_OLD_INODE_SIZE;
3527 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3528 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3529 if (sbi->s_want_extra_isize <
3530 le16_to_cpu(es->s_want_extra_isize))
3531 sbi->s_want_extra_isize =
3532 le16_to_cpu(es->s_want_extra_isize);
3533 if (sbi->s_want_extra_isize <
3534 le16_to_cpu(es->s_min_extra_isize))
3535 sbi->s_want_extra_isize =
3536 le16_to_cpu(es->s_min_extra_isize);
3537 }
3538 }
3539 /* Check if enough inode space is available */
3540 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3541 sbi->s_inode_size) {
3542 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3543 EXT4_GOOD_OLD_INODE_SIZE;
3544 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3545 "available");
3546 }
3547
3548 if (test_opt(sb, DELALLOC) &&
3549 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
3550 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3551 "requested data journaling mode");
3552 clear_opt(sbi->s_mount_opt, DELALLOC);
3553 }
3554 if (test_opt(sb, DIOREAD_NOLOCK)) {
3555 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3556 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3557 "option - requested data journaling mode");
3558 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3559 }
3560 if (sb->s_blocksize < PAGE_SIZE) {
3561 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3562 "option - block size is too small");
3563 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3564 }
3565 }
3566
3567 err = ext4_setup_system_zone(sb);
3568 if (err) {
3569 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3570 "zone (%d)", err);
3571 goto failed_mount4;
3572 }
3573
3574 ext4_ext_init(sb);
3575 err = ext4_mb_init(sb, needs_recovery);
3576 if (err) {
3577 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3578 err);
3579 goto failed_mount4;
3580 }
3581
3582 err = ext4_register_li_request(sb, first_not_zeroed);
3583 if (err)
3584 goto failed_mount4;
3585
3586 sbi->s_kobj.kset = ext4_kset;
3587 init_completion(&sbi->s_kobj_unregister);
3588 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3589 "%s", sb->s_id);
3590 if (err) {
3591 ext4_mb_release(sb);
3592 ext4_ext_release(sb);
3593 goto failed_mount4;
3594 };
3595
3596 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3597 ext4_orphan_cleanup(sb, es);
3598 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3599 if (needs_recovery) {
3600 ext4_msg(sb, KERN_INFO, "recovery complete");
3601 ext4_mark_recovery_complete(sb, es);
3602 }
3603 if (EXT4_SB(sb)->s_journal) {
3604 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3605 descr = " journalled data mode";
3606 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3607 descr = " ordered data mode";
3608 else
3609 descr = " writeback data mode";
3610 } else
3611 descr = "out journal";
3612
3613 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3614 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3615 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3616
3617 init_timer(&sbi->s_err_report);
3618 sbi->s_err_report.function = print_daily_error_info;
3619 sbi->s_err_report.data = (unsigned long) sb;
3620 if (es->s_error_count)
3621 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3622
3623 kfree(orig_data);
3624 return 0;
3625
3626 cantfind_ext4:
3627 if (!silent)
3628 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3629 goto failed_mount;
3630
3631 failed_mount4:
3632 ext4_msg(sb, KERN_ERR, "mount failed");
3633 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3634 failed_mount_wq:
3635 ext4_release_system_zone(sb);
3636 if (sbi->s_journal) {
3637 jbd2_journal_destroy(sbi->s_journal);
3638 sbi->s_journal = NULL;
3639 }
3640 failed_mount3:
3641 if (sbi->s_flex_groups) {
3642 if (is_vmalloc_addr(sbi->s_flex_groups))
3643 vfree(sbi->s_flex_groups);
3644 else
3645 kfree(sbi->s_flex_groups);
3646 }
3647 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3648 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3649 percpu_counter_destroy(&sbi->s_dirs_counter);
3650 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
3651 failed_mount2:
3652 for (i = 0; i < db_count; i++)
3653 brelse(sbi->s_group_desc[i]);
3654 kfree(sbi->s_group_desc);
3655 failed_mount:
3656 if (sbi->s_proc) {
3657 remove_proc_entry(sb->s_id, ext4_proc_root);
3658 }
3659 #ifdef CONFIG_QUOTA
3660 for (i = 0; i < MAXQUOTAS; i++)
3661 kfree(sbi->s_qf_names[i]);
3662 #endif
3663 ext4_blkdev_remove(sbi);
3664 brelse(bh);
3665 out_fail:
3666 sb->s_fs_info = NULL;
3667 kfree(sbi->s_blockgroup_lock);
3668 kfree(sbi);
3669 out_free_orig:
3670 kfree(orig_data);
3671 return ret;
3672 }
3673
3674 /*
3675 * Setup any per-fs journal parameters now. We'll do this both on
3676 * initial mount, once the journal has been initialised but before we've
3677 * done any recovery; and again on any subsequent remount.
3678 */
3679 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3680 {
3681 struct ext4_sb_info *sbi = EXT4_SB(sb);
3682
3683 journal->j_commit_interval = sbi->s_commit_interval;
3684 journal->j_min_batch_time = sbi->s_min_batch_time;
3685 journal->j_max_batch_time = sbi->s_max_batch_time;
3686
3687 write_lock(&journal->j_state_lock);
3688 if (test_opt(sb, BARRIER))
3689 journal->j_flags |= JBD2_BARRIER;
3690 else
3691 journal->j_flags &= ~JBD2_BARRIER;
3692 if (test_opt(sb, DATA_ERR_ABORT))
3693 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3694 else
3695 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3696 write_unlock(&journal->j_state_lock);
3697 }
3698
3699 static journal_t *ext4_get_journal(struct super_block *sb,
3700 unsigned int journal_inum)
3701 {
3702 struct inode *journal_inode;
3703 journal_t *journal;
3704
3705 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3706
3707 /* First, test for the existence of a valid inode on disk. Bad
3708 * things happen if we iget() an unused inode, as the subsequent
3709 * iput() will try to delete it. */
3710
3711 journal_inode = ext4_iget(sb, journal_inum);
3712 if (IS_ERR(journal_inode)) {
3713 ext4_msg(sb, KERN_ERR, "no journal found");
3714 return NULL;
3715 }
3716 if (!journal_inode->i_nlink) {
3717 make_bad_inode(journal_inode);
3718 iput(journal_inode);
3719 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3720 return NULL;
3721 }
3722
3723 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3724 journal_inode, journal_inode->i_size);
3725 if (!S_ISREG(journal_inode->i_mode)) {
3726 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3727 iput(journal_inode);
3728 return NULL;
3729 }
3730
3731 journal = jbd2_journal_init_inode(journal_inode);
3732 if (!journal) {
3733 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3734 iput(journal_inode);
3735 return NULL;
3736 }
3737 journal->j_private = sb;
3738 ext4_init_journal_params(sb, journal);
3739 return journal;
3740 }
3741
3742 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3743 dev_t j_dev)
3744 {
3745 struct buffer_head *bh;
3746 journal_t *journal;
3747 ext4_fsblk_t start;
3748 ext4_fsblk_t len;
3749 int hblock, blocksize;
3750 ext4_fsblk_t sb_block;
3751 unsigned long offset;
3752 struct ext4_super_block *es;
3753 struct block_device *bdev;
3754
3755 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3756
3757 bdev = ext4_blkdev_get(j_dev, sb);
3758 if (bdev == NULL)
3759 return NULL;
3760
3761 if (bd_claim(bdev, sb)) {
3762 ext4_msg(sb, KERN_ERR,
3763 "failed to claim external journal device");
3764 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3765 return NULL;
3766 }
3767
3768 blocksize = sb->s_blocksize;
3769 hblock = bdev_logical_block_size(bdev);
3770 if (blocksize < hblock) {
3771 ext4_msg(sb, KERN_ERR,
3772 "blocksize too small for journal device");
3773 goto out_bdev;
3774 }
3775
3776 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3777 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3778 set_blocksize(bdev, blocksize);
3779 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3780 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3781 "external journal");
3782 goto out_bdev;
3783 }
3784
3785 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3786 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3787 !(le32_to_cpu(es->s_feature_incompat) &
3788 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3789 ext4_msg(sb, KERN_ERR, "external journal has "
3790 "bad superblock");
3791 brelse(bh);
3792 goto out_bdev;
3793 }
3794
3795 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3796 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3797 brelse(bh);
3798 goto out_bdev;
3799 }
3800
3801 len = ext4_blocks_count(es);
3802 start = sb_block + 1;
3803 brelse(bh); /* we're done with the superblock */
3804
3805 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3806 start, len, blocksize);
3807 if (!journal) {
3808 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3809 goto out_bdev;
3810 }
3811 journal->j_private = sb;
3812 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3813 wait_on_buffer(journal->j_sb_buffer);
3814 if (!buffer_uptodate(journal->j_sb_buffer)) {
3815 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3816 goto out_journal;
3817 }
3818 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3819 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3820 "user (unsupported) - %d",
3821 be32_to_cpu(journal->j_superblock->s_nr_users));
3822 goto out_journal;
3823 }
3824 EXT4_SB(sb)->journal_bdev = bdev;
3825 ext4_init_journal_params(sb, journal);
3826 return journal;
3827
3828 out_journal:
3829 jbd2_journal_destroy(journal);
3830 out_bdev:
3831 ext4_blkdev_put(bdev);
3832 return NULL;
3833 }
3834
3835 static int ext4_load_journal(struct super_block *sb,
3836 struct ext4_super_block *es,
3837 unsigned long journal_devnum)
3838 {
3839 journal_t *journal;
3840 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3841 dev_t journal_dev;
3842 int err = 0;
3843 int really_read_only;
3844
3845 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3846
3847 if (journal_devnum &&
3848 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3849 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3850 "numbers have changed");
3851 journal_dev = new_decode_dev(journal_devnum);
3852 } else
3853 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3854
3855 really_read_only = bdev_read_only(sb->s_bdev);
3856
3857 /*
3858 * Are we loading a blank journal or performing recovery after a
3859 * crash? For recovery, we need to check in advance whether we
3860 * can get read-write access to the device.
3861 */
3862 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3863 if (sb->s_flags & MS_RDONLY) {
3864 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3865 "required on readonly filesystem");
3866 if (really_read_only) {
3867 ext4_msg(sb, KERN_ERR, "write access "
3868 "unavailable, cannot proceed");
3869 return -EROFS;
3870 }
3871 ext4_msg(sb, KERN_INFO, "write access will "
3872 "be enabled during recovery");
3873 }
3874 }
3875
3876 if (journal_inum && journal_dev) {
3877 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3878 "and inode journals!");
3879 return -EINVAL;
3880 }
3881
3882 if (journal_inum) {
3883 if (!(journal = ext4_get_journal(sb, journal_inum)))
3884 return -EINVAL;
3885 } else {
3886 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3887 return -EINVAL;
3888 }
3889
3890 if (!(journal->j_flags & JBD2_BARRIER))
3891 ext4_msg(sb, KERN_INFO, "barriers disabled");
3892
3893 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3894 err = jbd2_journal_update_format(journal);
3895 if (err) {
3896 ext4_msg(sb, KERN_ERR, "error updating journal");
3897 jbd2_journal_destroy(journal);
3898 return err;
3899 }
3900 }
3901
3902 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3903 err = jbd2_journal_wipe(journal, !really_read_only);
3904 if (!err) {
3905 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3906 if (save)
3907 memcpy(save, ((char *) es) +
3908 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
3909 err = jbd2_journal_load(journal);
3910 if (save)
3911 memcpy(((char *) es) + EXT4_S_ERR_START,
3912 save, EXT4_S_ERR_LEN);
3913 kfree(save);
3914 }
3915
3916 if (err) {
3917 ext4_msg(sb, KERN_ERR, "error loading journal");
3918 jbd2_journal_destroy(journal);
3919 return err;
3920 }
3921
3922 EXT4_SB(sb)->s_journal = journal;
3923 ext4_clear_journal_err(sb, es);
3924
3925 if (!really_read_only && journal_devnum &&
3926 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3927 es->s_journal_dev = cpu_to_le32(journal_devnum);
3928
3929 /* Make sure we flush the recovery flag to disk. */
3930 ext4_commit_super(sb, 1);
3931 }
3932
3933 return 0;
3934 }
3935
3936 static int ext4_commit_super(struct super_block *sb, int sync)
3937 {
3938 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3939 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3940 int error = 0;
3941
3942 if (!sbh)
3943 return error;
3944 if (buffer_write_io_error(sbh)) {
3945 /*
3946 * Oh, dear. A previous attempt to write the
3947 * superblock failed. This could happen because the
3948 * USB device was yanked out. Or it could happen to
3949 * be a transient write error and maybe the block will
3950 * be remapped. Nothing we can do but to retry the
3951 * write and hope for the best.
3952 */
3953 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3954 "superblock detected");
3955 clear_buffer_write_io_error(sbh);
3956 set_buffer_uptodate(sbh);
3957 }
3958 /*
3959 * If the file system is mounted read-only, don't update the
3960 * superblock write time. This avoids updating the superblock
3961 * write time when we are mounting the root file system
3962 * read/only but we need to replay the journal; at that point,
3963 * for people who are east of GMT and who make their clock
3964 * tick in localtime for Windows bug-for-bug compatibility,
3965 * the clock is set in the future, and this will cause e2fsck
3966 * to complain and force a full file system check.
3967 */
3968 if (!(sb->s_flags & MS_RDONLY))
3969 es->s_wtime = cpu_to_le32(get_seconds());
3970 if (sb->s_bdev->bd_part)
3971 es->s_kbytes_written =
3972 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3973 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3974 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3975 else
3976 es->s_kbytes_written =
3977 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
3978 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3979 &EXT4_SB(sb)->s_freeblocks_counter));
3980 es->s_free_inodes_count =
3981 cpu_to_le32(percpu_counter_sum_positive(
3982 &EXT4_SB(sb)->s_freeinodes_counter));
3983 sb->s_dirt = 0;
3984 BUFFER_TRACE(sbh, "marking dirty");
3985 mark_buffer_dirty(sbh);
3986 if (sync) {
3987 error = sync_dirty_buffer(sbh);
3988 if (error)
3989 return error;
3990
3991 error = buffer_write_io_error(sbh);
3992 if (error) {
3993 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3994 "superblock");
3995 clear_buffer_write_io_error(sbh);
3996 set_buffer_uptodate(sbh);
3997 }
3998 }
3999 return error;
4000 }
4001
4002 /*
4003 * Have we just finished recovery? If so, and if we are mounting (or
4004 * remounting) the filesystem readonly, then we will end up with a
4005 * consistent fs on disk. Record that fact.
4006 */
4007 static void ext4_mark_recovery_complete(struct super_block *sb,
4008 struct ext4_super_block *es)
4009 {
4010 journal_t *journal = EXT4_SB(sb)->s_journal;
4011
4012 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4013 BUG_ON(journal != NULL);
4014 return;
4015 }
4016 jbd2_journal_lock_updates(journal);
4017 if (jbd2_journal_flush(journal) < 0)
4018 goto out;
4019
4020 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4021 sb->s_flags & MS_RDONLY) {
4022 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4023 ext4_commit_super(sb, 1);
4024 }
4025
4026 out:
4027 jbd2_journal_unlock_updates(journal);
4028 }
4029
4030 /*
4031 * If we are mounting (or read-write remounting) a filesystem whose journal
4032 * has recorded an error from a previous lifetime, move that error to the
4033 * main filesystem now.
4034 */
4035 static void ext4_clear_journal_err(struct super_block *sb,
4036 struct ext4_super_block *es)
4037 {
4038 journal_t *journal;
4039 int j_errno;
4040 const char *errstr;
4041
4042 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4043
4044 journal = EXT4_SB(sb)->s_journal;
4045
4046 /*
4047 * Now check for any error status which may have been recorded in the
4048 * journal by a prior ext4_error() or ext4_abort()
4049 */
4050
4051 j_errno = jbd2_journal_errno(journal);
4052 if (j_errno) {
4053 char nbuf[16];
4054
4055 errstr = ext4_decode_error(sb, j_errno, nbuf);
4056 ext4_warning(sb, "Filesystem error recorded "
4057 "from previous mount: %s", errstr);
4058 ext4_warning(sb, "Marking fs in need of filesystem check.");
4059
4060 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4061 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4062 ext4_commit_super(sb, 1);
4063
4064 jbd2_journal_clear_err(journal);
4065 }
4066 }
4067
4068 /*
4069 * Force the running and committing transactions to commit,
4070 * and wait on the commit.
4071 */
4072 int ext4_force_commit(struct super_block *sb)
4073 {
4074 journal_t *journal;
4075 int ret = 0;
4076
4077 if (sb->s_flags & MS_RDONLY)
4078 return 0;
4079
4080 journal = EXT4_SB(sb)->s_journal;
4081 if (journal) {
4082 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4083 ret = ext4_journal_force_commit(journal);
4084 }
4085
4086 return ret;
4087 }
4088
4089 static void ext4_write_super(struct super_block *sb)
4090 {
4091 lock_super(sb);
4092 ext4_commit_super(sb, 1);
4093 unlock_super(sb);
4094 }
4095
4096 static int ext4_sync_fs(struct super_block *sb, int wait)
4097 {
4098 int ret = 0;
4099 tid_t target;
4100 struct ext4_sb_info *sbi = EXT4_SB(sb);
4101
4102 trace_ext4_sync_fs(sb, wait);
4103 flush_workqueue(sbi->dio_unwritten_wq);
4104 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4105 if (wait)
4106 jbd2_log_wait_commit(sbi->s_journal, target);
4107 }
4108 return ret;
4109 }
4110
4111 /*
4112 * LVM calls this function before a (read-only) snapshot is created. This
4113 * gives us a chance to flush the journal completely and mark the fs clean.
4114 */
4115 static int ext4_freeze(struct super_block *sb)
4116 {
4117 int error = 0;
4118 journal_t *journal;
4119
4120 if (sb->s_flags & MS_RDONLY)
4121 return 0;
4122
4123 journal = EXT4_SB(sb)->s_journal;
4124
4125 /* Now we set up the journal barrier. */
4126 jbd2_journal_lock_updates(journal);
4127
4128 /*
4129 * Don't clear the needs_recovery flag if we failed to flush
4130 * the journal.
4131 */
4132 error = jbd2_journal_flush(journal);
4133 if (error < 0)
4134 goto out;
4135
4136 /* Journal blocked and flushed, clear needs_recovery flag. */
4137 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4138 error = ext4_commit_super(sb, 1);
4139 out:
4140 /* we rely on s_frozen to stop further updates */
4141 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4142 return error;
4143 }
4144
4145 /*
4146 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4147 * flag here, even though the filesystem is not technically dirty yet.
4148 */
4149 static int ext4_unfreeze(struct super_block *sb)
4150 {
4151 if (sb->s_flags & MS_RDONLY)
4152 return 0;
4153
4154 lock_super(sb);
4155 /* Reset the needs_recovery flag before the fs is unlocked. */
4156 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4157 ext4_commit_super(sb, 1);
4158 unlock_super(sb);
4159 return 0;
4160 }
4161
4162 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4163 {
4164 struct ext4_super_block *es;
4165 struct ext4_sb_info *sbi = EXT4_SB(sb);
4166 ext4_fsblk_t n_blocks_count = 0;
4167 unsigned long old_sb_flags;
4168 struct ext4_mount_options old_opts;
4169 int enable_quota = 0;
4170 ext4_group_t g;
4171 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4172 int err;
4173 #ifdef CONFIG_QUOTA
4174 int i;
4175 #endif
4176 char *orig_data = kstrdup(data, GFP_KERNEL);
4177
4178 /* Store the original options */
4179 lock_super(sb);
4180 old_sb_flags = sb->s_flags;
4181 old_opts.s_mount_opt = sbi->s_mount_opt;
4182 old_opts.s_resuid = sbi->s_resuid;
4183 old_opts.s_resgid = sbi->s_resgid;
4184 old_opts.s_commit_interval = sbi->s_commit_interval;
4185 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4186 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4187 #ifdef CONFIG_QUOTA
4188 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4189 for (i = 0; i < MAXQUOTAS; i++)
4190 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4191 #endif
4192 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4193 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4194
4195 /*
4196 * Allow the "check" option to be passed as a remount option.
4197 */
4198 if (!parse_options(data, sb, NULL, &journal_ioprio,
4199 &n_blocks_count, 1)) {
4200 err = -EINVAL;
4201 goto restore_opts;
4202 }
4203
4204 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4205 ext4_abort(sb, "Abort forced by user");
4206
4207 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4208 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4209
4210 es = sbi->s_es;
4211
4212 if (sbi->s_journal) {
4213 ext4_init_journal_params(sb, sbi->s_journal);
4214 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4215 }
4216
4217 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
4218 n_blocks_count > ext4_blocks_count(es)) {
4219 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4220 err = -EROFS;
4221 goto restore_opts;
4222 }
4223
4224 if (*flags & MS_RDONLY) {
4225 err = dquot_suspend(sb, -1);
4226 if (err < 0)
4227 goto restore_opts;
4228
4229 /*
4230 * First of all, the unconditional stuff we have to do
4231 * to disable replay of the journal when we next remount
4232 */
4233 sb->s_flags |= MS_RDONLY;
4234
4235 /*
4236 * OK, test if we are remounting a valid rw partition
4237 * readonly, and if so set the rdonly flag and then
4238 * mark the partition as valid again.
4239 */
4240 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4241 (sbi->s_mount_state & EXT4_VALID_FS))
4242 es->s_state = cpu_to_le16(sbi->s_mount_state);
4243
4244 if (sbi->s_journal)
4245 ext4_mark_recovery_complete(sb, es);
4246 } else {
4247 /* Make sure we can mount this feature set readwrite */
4248 if (!ext4_feature_set_ok(sb, 0)) {
4249 err = -EROFS;
4250 goto restore_opts;
4251 }
4252 /*
4253 * Make sure the group descriptor checksums
4254 * are sane. If they aren't, refuse to remount r/w.
4255 */
4256 for (g = 0; g < sbi->s_groups_count; g++) {
4257 struct ext4_group_desc *gdp =
4258 ext4_get_group_desc(sb, g, NULL);
4259
4260 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4261 ext4_msg(sb, KERN_ERR,
4262 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4263 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4264 le16_to_cpu(gdp->bg_checksum));
4265 err = -EINVAL;
4266 goto restore_opts;
4267 }
4268 }
4269
4270 /*
4271 * If we have an unprocessed orphan list hanging
4272 * around from a previously readonly bdev mount,
4273 * require a full umount/remount for now.
4274 */
4275 if (es->s_last_orphan) {
4276 ext4_msg(sb, KERN_WARNING, "Couldn't "
4277 "remount RDWR because of unprocessed "
4278 "orphan inode list. Please "
4279 "umount/remount instead");
4280 err = -EINVAL;
4281 goto restore_opts;
4282 }
4283
4284 /*
4285 * Mounting a RDONLY partition read-write, so reread
4286 * and store the current valid flag. (It may have
4287 * been changed by e2fsck since we originally mounted
4288 * the partition.)
4289 */
4290 if (sbi->s_journal)
4291 ext4_clear_journal_err(sb, es);
4292 sbi->s_mount_state = le16_to_cpu(es->s_state);
4293 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
4294 goto restore_opts;
4295 if (!ext4_setup_super(sb, es, 0))
4296 sb->s_flags &= ~MS_RDONLY;
4297 enable_quota = 1;
4298 }
4299 }
4300
4301 /*
4302 * Reinitialize lazy itable initialization thread based on
4303 * current settings
4304 */
4305 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4306 ext4_unregister_li_request(sb);
4307 else {
4308 ext4_group_t first_not_zeroed;
4309 first_not_zeroed = ext4_has_uninit_itable(sb);
4310 ext4_register_li_request(sb, first_not_zeroed);
4311 }
4312
4313 ext4_setup_system_zone(sb);
4314 if (sbi->s_journal == NULL)
4315 ext4_commit_super(sb, 1);
4316
4317 #ifdef CONFIG_QUOTA
4318 /* Release old quota file names */
4319 for (i = 0; i < MAXQUOTAS; i++)
4320 if (old_opts.s_qf_names[i] &&
4321 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4322 kfree(old_opts.s_qf_names[i]);
4323 #endif
4324 unlock_super(sb);
4325 if (enable_quota)
4326 dquot_resume(sb, -1);
4327
4328 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4329 kfree(orig_data);
4330 return 0;
4331
4332 restore_opts:
4333 sb->s_flags = old_sb_flags;
4334 sbi->s_mount_opt = old_opts.s_mount_opt;
4335 sbi->s_resuid = old_opts.s_resuid;
4336 sbi->s_resgid = old_opts.s_resgid;
4337 sbi->s_commit_interval = old_opts.s_commit_interval;
4338 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4339 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4340 #ifdef CONFIG_QUOTA
4341 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4342 for (i = 0; i < MAXQUOTAS; i++) {
4343 if (sbi->s_qf_names[i] &&
4344 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4345 kfree(sbi->s_qf_names[i]);
4346 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4347 }
4348 #endif
4349 unlock_super(sb);
4350 kfree(orig_data);
4351 return err;
4352 }
4353
4354 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4355 {
4356 struct super_block *sb = dentry->d_sb;
4357 struct ext4_sb_info *sbi = EXT4_SB(sb);
4358 struct ext4_super_block *es = sbi->s_es;
4359 u64 fsid;
4360
4361 if (test_opt(sb, MINIX_DF)) {
4362 sbi->s_overhead_last = 0;
4363 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4364 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4365 ext4_fsblk_t overhead = 0;
4366
4367 /*
4368 * Compute the overhead (FS structures). This is constant
4369 * for a given filesystem unless the number of block groups
4370 * changes so we cache the previous value until it does.
4371 */
4372
4373 /*
4374 * All of the blocks before first_data_block are
4375 * overhead
4376 */
4377 overhead = le32_to_cpu(es->s_first_data_block);
4378
4379 /*
4380 * Add the overhead attributed to the superblock and
4381 * block group descriptors. If the sparse superblocks
4382 * feature is turned on, then not all groups have this.
4383 */
4384 for (i = 0; i < ngroups; i++) {
4385 overhead += ext4_bg_has_super(sb, i) +
4386 ext4_bg_num_gdb(sb, i);
4387 cond_resched();
4388 }
4389
4390 /*
4391 * Every block group has an inode bitmap, a block
4392 * bitmap, and an inode table.
4393 */
4394 overhead += ngroups * (2 + sbi->s_itb_per_group);
4395 sbi->s_overhead_last = overhead;
4396 smp_wmb();
4397 sbi->s_blocks_last = ext4_blocks_count(es);
4398 }
4399
4400 buf->f_type = EXT4_SUPER_MAGIC;
4401 buf->f_bsize = sb->s_blocksize;
4402 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
4403 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
4404 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
4405 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4406 if (buf->f_bfree < ext4_r_blocks_count(es))
4407 buf->f_bavail = 0;
4408 buf->f_files = le32_to_cpu(es->s_inodes_count);
4409 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4410 buf->f_namelen = EXT4_NAME_LEN;
4411 fsid = le64_to_cpup((void *)es->s_uuid) ^
4412 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4413 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4414 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4415
4416 return 0;
4417 }
4418
4419 /* Helper function for writing quotas on sync - we need to start transaction
4420 * before quota file is locked for write. Otherwise the are possible deadlocks:
4421 * Process 1 Process 2
4422 * ext4_create() quota_sync()
4423 * jbd2_journal_start() write_dquot()
4424 * dquot_initialize() down(dqio_mutex)
4425 * down(dqio_mutex) jbd2_journal_start()
4426 *
4427 */
4428
4429 #ifdef CONFIG_QUOTA
4430
4431 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4432 {
4433 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4434 }
4435
4436 static int ext4_write_dquot(struct dquot *dquot)
4437 {
4438 int ret, err;
4439 handle_t *handle;
4440 struct inode *inode;
4441
4442 inode = dquot_to_inode(dquot);
4443 handle = ext4_journal_start(inode,
4444 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4445 if (IS_ERR(handle))
4446 return PTR_ERR(handle);
4447 ret = dquot_commit(dquot);
4448 err = ext4_journal_stop(handle);
4449 if (!ret)
4450 ret = err;
4451 return ret;
4452 }
4453
4454 static int ext4_acquire_dquot(struct dquot *dquot)
4455 {
4456 int ret, err;
4457 handle_t *handle;
4458
4459 handle = ext4_journal_start(dquot_to_inode(dquot),
4460 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4461 if (IS_ERR(handle))
4462 return PTR_ERR(handle);
4463 ret = dquot_acquire(dquot);
4464 err = ext4_journal_stop(handle);
4465 if (!ret)
4466 ret = err;
4467 return ret;
4468 }
4469
4470 static int ext4_release_dquot(struct dquot *dquot)
4471 {
4472 int ret, err;
4473 handle_t *handle;
4474
4475 handle = ext4_journal_start(dquot_to_inode(dquot),
4476 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4477 if (IS_ERR(handle)) {
4478 /* Release dquot anyway to avoid endless cycle in dqput() */
4479 dquot_release(dquot);
4480 return PTR_ERR(handle);
4481 }
4482 ret = dquot_release(dquot);
4483 err = ext4_journal_stop(handle);
4484 if (!ret)
4485 ret = err;
4486 return ret;
4487 }
4488
4489 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4490 {
4491 /* Are we journaling quotas? */
4492 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4493 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4494 dquot_mark_dquot_dirty(dquot);
4495 return ext4_write_dquot(dquot);
4496 } else {
4497 return dquot_mark_dquot_dirty(dquot);
4498 }
4499 }
4500
4501 static int ext4_write_info(struct super_block *sb, int type)
4502 {
4503 int ret, err;
4504 handle_t *handle;
4505
4506 /* Data block + inode block */
4507 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4508 if (IS_ERR(handle))
4509 return PTR_ERR(handle);
4510 ret = dquot_commit_info(sb, type);
4511 err = ext4_journal_stop(handle);
4512 if (!ret)
4513 ret = err;
4514 return ret;
4515 }
4516
4517 /*
4518 * Turn on quotas during mount time - we need to find
4519 * the quota file and such...
4520 */
4521 static int ext4_quota_on_mount(struct super_block *sb, int type)
4522 {
4523 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4524 EXT4_SB(sb)->s_jquota_fmt, type);
4525 }
4526
4527 /*
4528 * Standard function to be called on quota_on
4529 */
4530 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4531 char *name)
4532 {
4533 int err;
4534 struct path path;
4535
4536 if (!test_opt(sb, QUOTA))
4537 return -EINVAL;
4538
4539 err = kern_path(name, LOOKUP_FOLLOW, &path);
4540 if (err)
4541 return err;
4542
4543 /* Quotafile not on the same filesystem? */
4544 if (path.mnt->mnt_sb != sb) {
4545 path_put(&path);
4546 return -EXDEV;
4547 }
4548 /* Journaling quota? */
4549 if (EXT4_SB(sb)->s_qf_names[type]) {
4550 /* Quotafile not in fs root? */
4551 if (path.dentry->d_parent != sb->s_root)
4552 ext4_msg(sb, KERN_WARNING,
4553 "Quota file not on filesystem root. "
4554 "Journaled quota will not work");
4555 }
4556
4557 /*
4558 * When we journal data on quota file, we have to flush journal to see
4559 * all updates to the file when we bypass pagecache...
4560 */
4561 if (EXT4_SB(sb)->s_journal &&
4562 ext4_should_journal_data(path.dentry->d_inode)) {
4563 /*
4564 * We don't need to lock updates but journal_flush() could
4565 * otherwise be livelocked...
4566 */
4567 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4568 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4569 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4570 if (err) {
4571 path_put(&path);
4572 return err;
4573 }
4574 }
4575
4576 err = dquot_quota_on_path(sb, type, format_id, &path);
4577 path_put(&path);
4578 return err;
4579 }
4580
4581 static int ext4_quota_off(struct super_block *sb, int type)
4582 {
4583 /* Force all delayed allocation blocks to be allocated.
4584 * Caller already holds s_umount sem */
4585 if (test_opt(sb, DELALLOC))
4586 sync_filesystem(sb);
4587
4588 return dquot_quota_off(sb, type);
4589 }
4590
4591 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4592 * acquiring the locks... As quota files are never truncated and quota code
4593 * itself serializes the operations (and noone else should touch the files)
4594 * we don't have to be afraid of races */
4595 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4596 size_t len, loff_t off)
4597 {
4598 struct inode *inode = sb_dqopt(sb)->files[type];
4599 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4600 int err = 0;
4601 int offset = off & (sb->s_blocksize - 1);
4602 int tocopy;
4603 size_t toread;
4604 struct buffer_head *bh;
4605 loff_t i_size = i_size_read(inode);
4606
4607 if (off > i_size)
4608 return 0;
4609 if (off+len > i_size)
4610 len = i_size-off;
4611 toread = len;
4612 while (toread > 0) {
4613 tocopy = sb->s_blocksize - offset < toread ?
4614 sb->s_blocksize - offset : toread;
4615 bh = ext4_bread(NULL, inode, blk, 0, &err);
4616 if (err)
4617 return err;
4618 if (!bh) /* A hole? */
4619 memset(data, 0, tocopy);
4620 else
4621 memcpy(data, bh->b_data+offset, tocopy);
4622 brelse(bh);
4623 offset = 0;
4624 toread -= tocopy;
4625 data += tocopy;
4626 blk++;
4627 }
4628 return len;
4629 }
4630
4631 /* Write to quotafile (we know the transaction is already started and has
4632 * enough credits) */
4633 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4634 const char *data, size_t len, loff_t off)
4635 {
4636 struct inode *inode = sb_dqopt(sb)->files[type];
4637 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4638 int err = 0;
4639 int offset = off & (sb->s_blocksize - 1);
4640 struct buffer_head *bh;
4641 handle_t *handle = journal_current_handle();
4642
4643 if (EXT4_SB(sb)->s_journal && !handle) {
4644 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4645 " cancelled because transaction is not started",
4646 (unsigned long long)off, (unsigned long long)len);
4647 return -EIO;
4648 }
4649 /*
4650 * Since we account only one data block in transaction credits,
4651 * then it is impossible to cross a block boundary.
4652 */
4653 if (sb->s_blocksize - offset < len) {
4654 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4655 " cancelled because not block aligned",
4656 (unsigned long long)off, (unsigned long long)len);
4657 return -EIO;
4658 }
4659
4660 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4661 bh = ext4_bread(handle, inode, blk, 1, &err);
4662 if (!bh)
4663 goto out;
4664 err = ext4_journal_get_write_access(handle, bh);
4665 if (err) {
4666 brelse(bh);
4667 goto out;
4668 }
4669 lock_buffer(bh);
4670 memcpy(bh->b_data+offset, data, len);
4671 flush_dcache_page(bh->b_page);
4672 unlock_buffer(bh);
4673 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4674 brelse(bh);
4675 out:
4676 if (err) {
4677 mutex_unlock(&inode->i_mutex);
4678 return err;
4679 }
4680 if (inode->i_size < off + len) {
4681 i_size_write(inode, off + len);
4682 EXT4_I(inode)->i_disksize = inode->i_size;
4683 }
4684 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4685 ext4_mark_inode_dirty(handle, inode);
4686 mutex_unlock(&inode->i_mutex);
4687 return len;
4688 }
4689
4690 #endif
4691
4692 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4693 const char *dev_name, void *data)
4694 {
4695 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
4696 }
4697
4698 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4699 static struct file_system_type ext2_fs_type = {
4700 .owner = THIS_MODULE,
4701 .name = "ext2",
4702 .mount = ext4_mount,
4703 .kill_sb = kill_block_super,
4704 .fs_flags = FS_REQUIRES_DEV,
4705 };
4706
4707 static inline void register_as_ext2(void)
4708 {
4709 int err = register_filesystem(&ext2_fs_type);
4710 if (err)
4711 printk(KERN_WARNING
4712 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4713 }
4714
4715 static inline void unregister_as_ext2(void)
4716 {
4717 unregister_filesystem(&ext2_fs_type);
4718 }
4719 MODULE_ALIAS("ext2");
4720 #else
4721 static inline void register_as_ext2(void) { }
4722 static inline void unregister_as_ext2(void) { }
4723 #endif
4724
4725 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4726 static inline void register_as_ext3(void)
4727 {
4728 int err = register_filesystem(&ext3_fs_type);
4729 if (err)
4730 printk(KERN_WARNING
4731 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4732 }
4733
4734 static inline void unregister_as_ext3(void)
4735 {
4736 unregister_filesystem(&ext3_fs_type);
4737 }
4738 MODULE_ALIAS("ext3");
4739 #else
4740 static inline void register_as_ext3(void) { }
4741 static inline void unregister_as_ext3(void) { }
4742 #endif
4743
4744 static struct file_system_type ext4_fs_type = {
4745 .owner = THIS_MODULE,
4746 .name = "ext4",
4747 .mount = ext4_mount,
4748 .kill_sb = kill_block_super,
4749 .fs_flags = FS_REQUIRES_DEV,
4750 };
4751
4752 int __init ext4_init_feat_adverts(void)
4753 {
4754 struct ext4_features *ef;
4755 int ret = -ENOMEM;
4756
4757 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4758 if (!ef)
4759 goto out;
4760
4761 ef->f_kobj.kset = ext4_kset;
4762 init_completion(&ef->f_kobj_unregister);
4763 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4764 "features");
4765 if (ret) {
4766 kfree(ef);
4767 goto out;
4768 }
4769
4770 ext4_feat = ef;
4771 ret = 0;
4772 out:
4773 return ret;
4774 }
4775
4776 static int __init ext4_init_fs(void)
4777 {
4778 int err;
4779
4780 ext4_check_flag_values();
4781 err = ext4_init_pageio();
4782 if (err)
4783 return err;
4784 err = ext4_init_system_zone();
4785 if (err)
4786 goto out5;
4787 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4788 if (!ext4_kset)
4789 goto out4;
4790 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4791
4792 err = ext4_init_feat_adverts();
4793
4794 err = ext4_init_mballoc();
4795 if (err)
4796 goto out3;
4797
4798 err = ext4_init_xattr();
4799 if (err)
4800 goto out2;
4801 err = init_inodecache();
4802 if (err)
4803 goto out1;
4804 register_as_ext2();
4805 register_as_ext3();
4806 err = register_filesystem(&ext4_fs_type);
4807 if (err)
4808 goto out;
4809
4810 ext4_li_info = NULL;
4811 mutex_init(&ext4_li_mtx);
4812 return 0;
4813 out:
4814 unregister_as_ext2();
4815 unregister_as_ext3();
4816 destroy_inodecache();
4817 out1:
4818 ext4_exit_xattr();
4819 out2:
4820 ext4_exit_mballoc();
4821 out3:
4822 kfree(ext4_feat);
4823 remove_proc_entry("fs/ext4", NULL);
4824 kset_unregister(ext4_kset);
4825 out4:
4826 ext4_exit_system_zone();
4827 out5:
4828 ext4_exit_pageio();
4829 return err;
4830 }
4831
4832 static void __exit ext4_exit_fs(void)
4833 {
4834 ext4_destroy_lazyinit_thread();
4835 unregister_as_ext2();
4836 unregister_as_ext3();
4837 unregister_filesystem(&ext4_fs_type);
4838 destroy_inodecache();
4839 ext4_exit_xattr();
4840 ext4_exit_mballoc();
4841 remove_proc_entry("fs/ext4", NULL);
4842 kset_unregister(ext4_kset);
4843 ext4_exit_system_zone();
4844 ext4_exit_pageio();
4845 }
4846
4847 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4848 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4849 MODULE_LICENSE("GPL");
4850 module_init(ext4_init_fs)
4851 module_exit(ext4_exit_fs)