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ext4: handle writeback of inodes which are being freed
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / super.c
blob45653af889532e9e49e4236392ad78049b66439b
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 void ext4_destroy_inode(struct inode *inode)
837 {
838 ext4_ioend_wait(inode);
839 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
840 ext4_msg(inode->i_sb, KERN_ERR,
841 "Inode %lu (%p): orphan list check failed!",
842 inode->i_ino, EXT4_I(inode));
843 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
844 EXT4_I(inode), sizeof(struct ext4_inode_info),
845 true);
846 dump_stack();
847 }
848 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
849 }
850
851 static void init_once(void *foo)
852 {
853 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
854
855 INIT_LIST_HEAD(&ei->i_orphan);
856 #ifdef CONFIG_EXT4_FS_XATTR
857 init_rwsem(&ei->xattr_sem);
858 #endif
859 init_rwsem(&ei->i_data_sem);
860 inode_init_once(&ei->vfs_inode);
861 }
862
863 static int init_inodecache(void)
864 {
865 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
866 sizeof(struct ext4_inode_info),
867 0, (SLAB_RECLAIM_ACCOUNT|
868 SLAB_MEM_SPREAD),
869 init_once);
870 if (ext4_inode_cachep == NULL)
871 return -ENOMEM;
872 return 0;
873 }
874
875 static void destroy_inodecache(void)
876 {
877 kmem_cache_destroy(ext4_inode_cachep);
878 }
879
880 void ext4_clear_inode(struct inode *inode)
881 {
882 invalidate_inode_buffers(inode);
883 end_writeback(inode);
884 dquot_drop(inode);
885 ext4_discard_preallocations(inode);
886 if (EXT4_JOURNAL(inode))
887 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
888 &EXT4_I(inode)->jinode);
889 }
890
891 static inline void ext4_show_quota_options(struct seq_file *seq,
892 struct super_block *sb)
893 {
894 #if defined(CONFIG_QUOTA)
895 struct ext4_sb_info *sbi = EXT4_SB(sb);
896
897 if (sbi->s_jquota_fmt) {
898 char *fmtname = "";
899
900 switch (sbi->s_jquota_fmt) {
901 case QFMT_VFS_OLD:
902 fmtname = "vfsold";
903 break;
904 case QFMT_VFS_V0:
905 fmtname = "vfsv0";
906 break;
907 case QFMT_VFS_V1:
908 fmtname = "vfsv1";
909 break;
910 }
911 seq_printf(seq, ",jqfmt=%s", fmtname);
912 }
913
914 if (sbi->s_qf_names[USRQUOTA])
915 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
916
917 if (sbi->s_qf_names[GRPQUOTA])
918 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
919
920 if (test_opt(sb, USRQUOTA))
921 seq_puts(seq, ",usrquota");
922
923 if (test_opt(sb, GRPQUOTA))
924 seq_puts(seq, ",grpquota");
925 #endif
926 }
927
928 /*
929 * Show an option if
930 * - it's set to a non-default value OR
931 * - if the per-sb default is different from the global default
932 */
933 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
934 {
935 int def_errors;
936 unsigned long def_mount_opts;
937 struct super_block *sb = vfs->mnt_sb;
938 struct ext4_sb_info *sbi = EXT4_SB(sb);
939 struct ext4_super_block *es = sbi->s_es;
940
941 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
942 def_errors = le16_to_cpu(es->s_errors);
943
944 if (sbi->s_sb_block != 1)
945 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
946 if (test_opt(sb, MINIX_DF))
947 seq_puts(seq, ",minixdf");
948 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
949 seq_puts(seq, ",grpid");
950 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
951 seq_puts(seq, ",nogrpid");
952 if (sbi->s_resuid != EXT4_DEF_RESUID ||
953 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
954 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
955 }
956 if (sbi->s_resgid != EXT4_DEF_RESGID ||
957 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
958 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
959 }
960 if (test_opt(sb, ERRORS_RO)) {
961 if (def_errors == EXT4_ERRORS_PANIC ||
962 def_errors == EXT4_ERRORS_CONTINUE) {
963 seq_puts(seq, ",errors=remount-ro");
964 }
965 }
966 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
967 seq_puts(seq, ",errors=continue");
968 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
969 seq_puts(seq, ",errors=panic");
970 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
971 seq_puts(seq, ",nouid32");
972 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
973 seq_puts(seq, ",debug");
974 if (test_opt(sb, OLDALLOC))
975 seq_puts(seq, ",oldalloc");
976 #ifdef CONFIG_EXT4_FS_XATTR
977 if (test_opt(sb, XATTR_USER) &&
978 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
979 seq_puts(seq, ",user_xattr");
980 if (!test_opt(sb, XATTR_USER) &&
981 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
982 seq_puts(seq, ",nouser_xattr");
983 }
984 #endif
985 #ifdef CONFIG_EXT4_FS_POSIX_ACL
986 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
987 seq_puts(seq, ",acl");
988 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
989 seq_puts(seq, ",noacl");
990 #endif
991 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
992 seq_printf(seq, ",commit=%u",
993 (unsigned) (sbi->s_commit_interval / HZ));
994 }
995 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
996 seq_printf(seq, ",min_batch_time=%u",
997 (unsigned) sbi->s_min_batch_time);
998 }
999 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1000 seq_printf(seq, ",max_batch_time=%u",
1001 (unsigned) sbi->s_min_batch_time);
1002 }
1003
1004 /*
1005 * We're changing the default of barrier mount option, so
1006 * let's always display its mount state so it's clear what its
1007 * status is.
1008 */
1009 seq_puts(seq, ",barrier=");
1010 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1011 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1012 seq_puts(seq, ",journal_async_commit");
1013 else if (test_opt(sb, JOURNAL_CHECKSUM))
1014 seq_puts(seq, ",journal_checksum");
1015 if (test_opt(sb, I_VERSION))
1016 seq_puts(seq, ",i_version");
1017 if (!test_opt(sb, DELALLOC) &&
1018 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1019 seq_puts(seq, ",nodelalloc");
1020
1021 if (sbi->s_stripe)
1022 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1023 /*
1024 * journal mode get enabled in different ways
1025 * So just print the value even if we didn't specify it
1026 */
1027 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1028 seq_puts(seq, ",data=journal");
1029 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1030 seq_puts(seq, ",data=ordered");
1031 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1032 seq_puts(seq, ",data=writeback");
1033
1034 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1035 seq_printf(seq, ",inode_readahead_blks=%u",
1036 sbi->s_inode_readahead_blks);
1037
1038 if (test_opt(sb, DATA_ERR_ABORT))
1039 seq_puts(seq, ",data_err=abort");
1040
1041 if (test_opt(sb, NO_AUTO_DA_ALLOC))
1042 seq_puts(seq, ",noauto_da_alloc");
1043
1044 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1045 seq_puts(seq, ",discard");
1046
1047 if (test_opt(sb, NOLOAD))
1048 seq_puts(seq, ",norecovery");
1049
1050 if (test_opt(sb, DIOREAD_NOLOCK))
1051 seq_puts(seq, ",dioread_nolock");
1052
1053 if (test_opt(sb, BLOCK_VALIDITY) &&
1054 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1055 seq_puts(seq, ",block_validity");
1056
1057 if (!test_opt(sb, INIT_INODE_TABLE))
1058 seq_puts(seq, ",noinit_inode_table");
1059 else if (sbi->s_li_wait_mult)
1060 seq_printf(seq, ",init_inode_table=%u",
1061 (unsigned) sbi->s_li_wait_mult);
1062
1063 ext4_show_quota_options(seq, sb);
1064
1065 return 0;
1066 }
1067
1068 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1069 u64 ino, u32 generation)
1070 {
1071 struct inode *inode;
1072
1073 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1074 return ERR_PTR(-ESTALE);
1075 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1076 return ERR_PTR(-ESTALE);
1077
1078 /* iget isn't really right if the inode is currently unallocated!!
1079 *
1080 * ext4_read_inode will return a bad_inode if the inode had been
1081 * deleted, so we should be safe.
1082 *
1083 * Currently we don't know the generation for parent directory, so
1084 * a generation of 0 means "accept any"
1085 */
1086 inode = ext4_iget(sb, ino);
1087 if (IS_ERR(inode))
1088 return ERR_CAST(inode);
1089 if (generation && inode->i_generation != generation) {
1090 iput(inode);
1091 return ERR_PTR(-ESTALE);
1092 }
1093
1094 return inode;
1095 }
1096
1097 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1098 int fh_len, int fh_type)
1099 {
1100 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1101 ext4_nfs_get_inode);
1102 }
1103
1104 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1105 int fh_len, int fh_type)
1106 {
1107 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1108 ext4_nfs_get_inode);
1109 }
1110
1111 /*
1112 * Try to release metadata pages (indirect blocks, directories) which are
1113 * mapped via the block device. Since these pages could have journal heads
1114 * which would prevent try_to_free_buffers() from freeing them, we must use
1115 * jbd2 layer's try_to_free_buffers() function to release them.
1116 */
1117 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1118 gfp_t wait)
1119 {
1120 journal_t *journal = EXT4_SB(sb)->s_journal;
1121
1122 WARN_ON(PageChecked(page));
1123 if (!page_has_buffers(page))
1124 return 0;
1125 if (journal)
1126 return jbd2_journal_try_to_free_buffers(journal, page,
1127 wait & ~__GFP_WAIT);
1128 return try_to_free_buffers(page);
1129 }
1130
1131 #ifdef CONFIG_QUOTA
1132 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1133 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1134
1135 static int ext4_write_dquot(struct dquot *dquot);
1136 static int ext4_acquire_dquot(struct dquot *dquot);
1137 static int ext4_release_dquot(struct dquot *dquot);
1138 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1139 static int ext4_write_info(struct super_block *sb, int type);
1140 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1141 char *path);
1142 static int ext4_quota_off(struct super_block *sb, int type);
1143 static int ext4_quota_on_mount(struct super_block *sb, int type);
1144 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1145 size_t len, loff_t off);
1146 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1147 const char *data, size_t len, loff_t off);
1148
1149 static const struct dquot_operations ext4_quota_operations = {
1150 #ifdef CONFIG_QUOTA
1151 .get_reserved_space = ext4_get_reserved_space,
1152 #endif
1153 .write_dquot = ext4_write_dquot,
1154 .acquire_dquot = ext4_acquire_dquot,
1155 .release_dquot = ext4_release_dquot,
1156 .mark_dirty = ext4_mark_dquot_dirty,
1157 .write_info = ext4_write_info,
1158 .alloc_dquot = dquot_alloc,
1159 .destroy_dquot = dquot_destroy,
1160 };
1161
1162 static const struct quotactl_ops ext4_qctl_operations = {
1163 .quota_on = ext4_quota_on,
1164 .quota_off = ext4_quota_off,
1165 .quota_sync = dquot_quota_sync,
1166 .get_info = dquot_get_dqinfo,
1167 .set_info = dquot_set_dqinfo,
1168 .get_dqblk = dquot_get_dqblk,
1169 .set_dqblk = dquot_set_dqblk
1170 };
1171 #endif
1172
1173 static const struct super_operations ext4_sops = {
1174 .alloc_inode = ext4_alloc_inode,
1175 .destroy_inode = ext4_destroy_inode,
1176 .write_inode = ext4_write_inode,
1177 .dirty_inode = ext4_dirty_inode,
1178 .evict_inode = ext4_evict_inode,
1179 .put_super = ext4_put_super,
1180 .sync_fs = ext4_sync_fs,
1181 .freeze_fs = ext4_freeze,
1182 .unfreeze_fs = ext4_unfreeze,
1183 .statfs = ext4_statfs,
1184 .remount_fs = ext4_remount,
1185 .show_options = ext4_show_options,
1186 #ifdef CONFIG_QUOTA
1187 .quota_read = ext4_quota_read,
1188 .quota_write = ext4_quota_write,
1189 #endif
1190 .bdev_try_to_free_page = bdev_try_to_free_page,
1191 .trim_fs = ext4_trim_fs
1192 };
1193
1194 static const struct super_operations ext4_nojournal_sops = {
1195 .alloc_inode = ext4_alloc_inode,
1196 .destroy_inode = ext4_destroy_inode,
1197 .write_inode = ext4_write_inode,
1198 .dirty_inode = ext4_dirty_inode,
1199 .evict_inode = ext4_evict_inode,
1200 .write_super = ext4_write_super,
1201 .put_super = ext4_put_super,
1202 .statfs = ext4_statfs,
1203 .remount_fs = ext4_remount,
1204 .show_options = ext4_show_options,
1205 #ifdef CONFIG_QUOTA
1206 .quota_read = ext4_quota_read,
1207 .quota_write = ext4_quota_write,
1208 #endif
1209 .bdev_try_to_free_page = bdev_try_to_free_page,
1210 };
1211
1212 static const struct export_operations ext4_export_ops = {
1213 .fh_to_dentry = ext4_fh_to_dentry,
1214 .fh_to_parent = ext4_fh_to_parent,
1215 .get_parent = ext4_get_parent,
1216 };
1217
1218 enum {
1219 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1220 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1221 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1222 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1223 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1224 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1225 Opt_journal_update, Opt_journal_dev,
1226 Opt_journal_checksum, Opt_journal_async_commit,
1227 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1228 Opt_data_err_abort, Opt_data_err_ignore,
1229 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1230 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1231 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1232 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1233 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1234 Opt_block_validity, Opt_noblock_validity,
1235 Opt_inode_readahead_blks, Opt_journal_ioprio,
1236 Opt_dioread_nolock, Opt_dioread_lock,
1237 Opt_discard, Opt_nodiscard,
1238 Opt_init_inode_table, Opt_noinit_inode_table,
1239 };
1240
1241 static const match_table_t tokens = {
1242 {Opt_bsd_df, "bsddf"},
1243 {Opt_minix_df, "minixdf"},
1244 {Opt_grpid, "grpid"},
1245 {Opt_grpid, "bsdgroups"},
1246 {Opt_nogrpid, "nogrpid"},
1247 {Opt_nogrpid, "sysvgroups"},
1248 {Opt_resgid, "resgid=%u"},
1249 {Opt_resuid, "resuid=%u"},
1250 {Opt_sb, "sb=%u"},
1251 {Opt_err_cont, "errors=continue"},
1252 {Opt_err_panic, "errors=panic"},
1253 {Opt_err_ro, "errors=remount-ro"},
1254 {Opt_nouid32, "nouid32"},
1255 {Opt_debug, "debug"},
1256 {Opt_oldalloc, "oldalloc"},
1257 {Opt_orlov, "orlov"},
1258 {Opt_user_xattr, "user_xattr"},
1259 {Opt_nouser_xattr, "nouser_xattr"},
1260 {Opt_acl, "acl"},
1261 {Opt_noacl, "noacl"},
1262 {Opt_noload, "noload"},
1263 {Opt_noload, "norecovery"},
1264 {Opt_nobh, "nobh"},
1265 {Opt_bh, "bh"},
1266 {Opt_commit, "commit=%u"},
1267 {Opt_min_batch_time, "min_batch_time=%u"},
1268 {Opt_max_batch_time, "max_batch_time=%u"},
1269 {Opt_journal_update, "journal=update"},
1270 {Opt_journal_dev, "journal_dev=%u"},
1271 {Opt_journal_checksum, "journal_checksum"},
1272 {Opt_journal_async_commit, "journal_async_commit"},
1273 {Opt_abort, "abort"},
1274 {Opt_data_journal, "data=journal"},
1275 {Opt_data_ordered, "data=ordered"},
1276 {Opt_data_writeback, "data=writeback"},
1277 {Opt_data_err_abort, "data_err=abort"},
1278 {Opt_data_err_ignore, "data_err=ignore"},
1279 {Opt_offusrjquota, "usrjquota="},
1280 {Opt_usrjquota, "usrjquota=%s"},
1281 {Opt_offgrpjquota, "grpjquota="},
1282 {Opt_grpjquota, "grpjquota=%s"},
1283 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1284 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1285 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1286 {Opt_grpquota, "grpquota"},
1287 {Opt_noquota, "noquota"},
1288 {Opt_quota, "quota"},
1289 {Opt_usrquota, "usrquota"},
1290 {Opt_barrier, "barrier=%u"},
1291 {Opt_barrier, "barrier"},
1292 {Opt_nobarrier, "nobarrier"},
1293 {Opt_i_version, "i_version"},
1294 {Opt_stripe, "stripe=%u"},
1295 {Opt_resize, "resize"},
1296 {Opt_delalloc, "delalloc"},
1297 {Opt_nodelalloc, "nodelalloc"},
1298 {Opt_block_validity, "block_validity"},
1299 {Opt_noblock_validity, "noblock_validity"},
1300 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1301 {Opt_journal_ioprio, "journal_ioprio=%u"},
1302 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1303 {Opt_auto_da_alloc, "auto_da_alloc"},
1304 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1305 {Opt_dioread_nolock, "dioread_nolock"},
1306 {Opt_dioread_lock, "dioread_lock"},
1307 {Opt_discard, "discard"},
1308 {Opt_nodiscard, "nodiscard"},
1309 {Opt_init_inode_table, "init_itable=%u"},
1310 {Opt_init_inode_table, "init_itable"},
1311 {Opt_noinit_inode_table, "noinit_itable"},
1312 {Opt_err, NULL},
1313 };
1314
1315 static ext4_fsblk_t get_sb_block(void **data)
1316 {
1317 ext4_fsblk_t sb_block;
1318 char *options = (char *) *data;
1319
1320 if (!options || strncmp(options, "sb=", 3) != 0)
1321 return 1; /* Default location */
1322
1323 options += 3;
1324 /* TODO: use simple_strtoll with >32bit ext4 */
1325 sb_block = simple_strtoul(options, &options, 0);
1326 if (*options && *options != ',') {
1327 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1328 (char *) *data);
1329 return 1;
1330 }
1331 if (*options == ',')
1332 options++;
1333 *data = (void *) options;
1334
1335 return sb_block;
1336 }
1337
1338 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1339 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1340 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1341
1342 #ifdef CONFIG_QUOTA
1343 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1344 {
1345 struct ext4_sb_info *sbi = EXT4_SB(sb);
1346 char *qname;
1347
1348 if (sb_any_quota_loaded(sb) &&
1349 !sbi->s_qf_names[qtype]) {
1350 ext4_msg(sb, KERN_ERR,
1351 "Cannot change journaled "
1352 "quota options when quota turned on");
1353 return 0;
1354 }
1355 qname = match_strdup(args);
1356 if (!qname) {
1357 ext4_msg(sb, KERN_ERR,
1358 "Not enough memory for storing quotafile name");
1359 return 0;
1360 }
1361 if (sbi->s_qf_names[qtype] &&
1362 strcmp(sbi->s_qf_names[qtype], qname)) {
1363 ext4_msg(sb, KERN_ERR,
1364 "%s quota file already specified", QTYPE2NAME(qtype));
1365 kfree(qname);
1366 return 0;
1367 }
1368 sbi->s_qf_names[qtype] = qname;
1369 if (strchr(sbi->s_qf_names[qtype], '/')) {
1370 ext4_msg(sb, KERN_ERR,
1371 "quotafile must be on filesystem root");
1372 kfree(sbi->s_qf_names[qtype]);
1373 sbi->s_qf_names[qtype] = NULL;
1374 return 0;
1375 }
1376 set_opt(sbi->s_mount_opt, QUOTA);
1377 return 1;
1378 }
1379
1380 static int clear_qf_name(struct super_block *sb, int qtype)
1381 {
1382
1383 struct ext4_sb_info *sbi = EXT4_SB(sb);
1384
1385 if (sb_any_quota_loaded(sb) &&
1386 sbi->s_qf_names[qtype]) {
1387 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1388 " when quota turned on");
1389 return 0;
1390 }
1391 /*
1392 * The space will be released later when all options are confirmed
1393 * to be correct
1394 */
1395 sbi->s_qf_names[qtype] = NULL;
1396 return 1;
1397 }
1398 #endif
1399
1400 static int parse_options(char *options, struct super_block *sb,
1401 unsigned long *journal_devnum,
1402 unsigned int *journal_ioprio,
1403 ext4_fsblk_t *n_blocks_count, int is_remount)
1404 {
1405 struct ext4_sb_info *sbi = EXT4_SB(sb);
1406 char *p;
1407 substring_t args[MAX_OPT_ARGS];
1408 int data_opt = 0;
1409 int option;
1410 #ifdef CONFIG_QUOTA
1411 int qfmt;
1412 #endif
1413
1414 if (!options)
1415 return 1;
1416
1417 while ((p = strsep(&options, ",")) != NULL) {
1418 int token;
1419 if (!*p)
1420 continue;
1421
1422 /*
1423 * Initialize args struct so we know whether arg was
1424 * found; some options take optional arguments.
1425 */
1426 args[0].to = args[0].from = 0;
1427 token = match_token(p, tokens, args);
1428 switch (token) {
1429 case Opt_bsd_df:
1430 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1431 clear_opt(sbi->s_mount_opt, MINIX_DF);
1432 break;
1433 case Opt_minix_df:
1434 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1435 set_opt(sbi->s_mount_opt, MINIX_DF);
1436
1437 break;
1438 case Opt_grpid:
1439 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1440 set_opt(sbi->s_mount_opt, GRPID);
1441
1442 break;
1443 case Opt_nogrpid:
1444 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1445 clear_opt(sbi->s_mount_opt, GRPID);
1446
1447 break;
1448 case Opt_resuid:
1449 if (match_int(&args[0], &option))
1450 return 0;
1451 sbi->s_resuid = option;
1452 break;
1453 case Opt_resgid:
1454 if (match_int(&args[0], &option))
1455 return 0;
1456 sbi->s_resgid = option;
1457 break;
1458 case Opt_sb:
1459 /* handled by get_sb_block() instead of here */
1460 /* *sb_block = match_int(&args[0]); */
1461 break;
1462 case Opt_err_panic:
1463 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1464 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1465 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1466 break;
1467 case Opt_err_ro:
1468 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1469 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1470 set_opt(sbi->s_mount_opt, ERRORS_RO);
1471 break;
1472 case Opt_err_cont:
1473 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1474 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1475 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1476 break;
1477 case Opt_nouid32:
1478 set_opt(sbi->s_mount_opt, NO_UID32);
1479 break;
1480 case Opt_debug:
1481 set_opt(sbi->s_mount_opt, DEBUG);
1482 break;
1483 case Opt_oldalloc:
1484 set_opt(sbi->s_mount_opt, OLDALLOC);
1485 break;
1486 case Opt_orlov:
1487 clear_opt(sbi->s_mount_opt, OLDALLOC);
1488 break;
1489 #ifdef CONFIG_EXT4_FS_XATTR
1490 case Opt_user_xattr:
1491 set_opt(sbi->s_mount_opt, XATTR_USER);
1492 break;
1493 case Opt_nouser_xattr:
1494 clear_opt(sbi->s_mount_opt, XATTR_USER);
1495 break;
1496 #else
1497 case Opt_user_xattr:
1498 case Opt_nouser_xattr:
1499 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1500 break;
1501 #endif
1502 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1503 case Opt_acl:
1504 set_opt(sbi->s_mount_opt, POSIX_ACL);
1505 break;
1506 case Opt_noacl:
1507 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1508 break;
1509 #else
1510 case Opt_acl:
1511 case Opt_noacl:
1512 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1513 break;
1514 #endif
1515 case Opt_journal_update:
1516 /* @@@ FIXME */
1517 /* Eventually we will want to be able to create
1518 a journal file here. For now, only allow the
1519 user to specify an existing inode to be the
1520 journal file. */
1521 if (is_remount) {
1522 ext4_msg(sb, KERN_ERR,
1523 "Cannot specify journal on remount");
1524 return 0;
1525 }
1526 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1527 break;
1528 case Opt_journal_dev:
1529 if (is_remount) {
1530 ext4_msg(sb, KERN_ERR,
1531 "Cannot specify journal on remount");
1532 return 0;
1533 }
1534 if (match_int(&args[0], &option))
1535 return 0;
1536 *journal_devnum = option;
1537 break;
1538 case Opt_journal_checksum:
1539 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1540 break;
1541 case Opt_journal_async_commit:
1542 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1543 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1544 break;
1545 case Opt_noload:
1546 set_opt(sbi->s_mount_opt, NOLOAD);
1547 break;
1548 case Opt_commit:
1549 if (match_int(&args[0], &option))
1550 return 0;
1551 if (option < 0)
1552 return 0;
1553 if (option == 0)
1554 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1555 sbi->s_commit_interval = HZ * option;
1556 break;
1557 case Opt_max_batch_time:
1558 if (match_int(&args[0], &option))
1559 return 0;
1560 if (option < 0)
1561 return 0;
1562 if (option == 0)
1563 option = EXT4_DEF_MAX_BATCH_TIME;
1564 sbi->s_max_batch_time = option;
1565 break;
1566 case Opt_min_batch_time:
1567 if (match_int(&args[0], &option))
1568 return 0;
1569 if (option < 0)
1570 return 0;
1571 sbi->s_min_batch_time = option;
1572 break;
1573 case Opt_data_journal:
1574 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1575 goto datacheck;
1576 case Opt_data_ordered:
1577 data_opt = EXT4_MOUNT_ORDERED_DATA;
1578 goto datacheck;
1579 case Opt_data_writeback:
1580 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1581 datacheck:
1582 if (is_remount) {
1583 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1584 ext4_msg(sb, KERN_ERR,
1585 "Cannot change data mode on remount");
1586 return 0;
1587 }
1588 } else {
1589 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1590 sbi->s_mount_opt |= data_opt;
1591 }
1592 break;
1593 case Opt_data_err_abort:
1594 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1595 break;
1596 case Opt_data_err_ignore:
1597 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1598 break;
1599 #ifdef CONFIG_QUOTA
1600 case Opt_usrjquota:
1601 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1602 return 0;
1603 break;
1604 case Opt_grpjquota:
1605 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1606 return 0;
1607 break;
1608 case Opt_offusrjquota:
1609 if (!clear_qf_name(sb, USRQUOTA))
1610 return 0;
1611 break;
1612 case Opt_offgrpjquota:
1613 if (!clear_qf_name(sb, GRPQUOTA))
1614 return 0;
1615 break;
1616
1617 case Opt_jqfmt_vfsold:
1618 qfmt = QFMT_VFS_OLD;
1619 goto set_qf_format;
1620 case Opt_jqfmt_vfsv0:
1621 qfmt = QFMT_VFS_V0;
1622 goto set_qf_format;
1623 case Opt_jqfmt_vfsv1:
1624 qfmt = QFMT_VFS_V1;
1625 set_qf_format:
1626 if (sb_any_quota_loaded(sb) &&
1627 sbi->s_jquota_fmt != qfmt) {
1628 ext4_msg(sb, KERN_ERR, "Cannot change "
1629 "journaled quota options when "
1630 "quota turned on");
1631 return 0;
1632 }
1633 sbi->s_jquota_fmt = qfmt;
1634 break;
1635 case Opt_quota:
1636 case Opt_usrquota:
1637 set_opt(sbi->s_mount_opt, QUOTA);
1638 set_opt(sbi->s_mount_opt, USRQUOTA);
1639 break;
1640 case Opt_grpquota:
1641 set_opt(sbi->s_mount_opt, QUOTA);
1642 set_opt(sbi->s_mount_opt, GRPQUOTA);
1643 break;
1644 case Opt_noquota:
1645 if (sb_any_quota_loaded(sb)) {
1646 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1647 "options when quota turned on");
1648 return 0;
1649 }
1650 clear_opt(sbi->s_mount_opt, QUOTA);
1651 clear_opt(sbi->s_mount_opt, USRQUOTA);
1652 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1653 break;
1654 #else
1655 case Opt_quota:
1656 case Opt_usrquota:
1657 case Opt_grpquota:
1658 ext4_msg(sb, KERN_ERR,
1659 "quota options not supported");
1660 break;
1661 case Opt_usrjquota:
1662 case Opt_grpjquota:
1663 case Opt_offusrjquota:
1664 case Opt_offgrpjquota:
1665 case Opt_jqfmt_vfsold:
1666 case Opt_jqfmt_vfsv0:
1667 case Opt_jqfmt_vfsv1:
1668 ext4_msg(sb, KERN_ERR,
1669 "journaled quota options not supported");
1670 break;
1671 case Opt_noquota:
1672 break;
1673 #endif
1674 case Opt_abort:
1675 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1676 break;
1677 case Opt_nobarrier:
1678 clear_opt(sbi->s_mount_opt, BARRIER);
1679 break;
1680 case Opt_barrier:
1681 if (args[0].from) {
1682 if (match_int(&args[0], &option))
1683 return 0;
1684 } else
1685 option = 1; /* No argument, default to 1 */
1686 if (option)
1687 set_opt(sbi->s_mount_opt, BARRIER);
1688 else
1689 clear_opt(sbi->s_mount_opt, BARRIER);
1690 break;
1691 case Opt_ignore:
1692 break;
1693 case Opt_resize:
1694 if (!is_remount) {
1695 ext4_msg(sb, KERN_ERR,
1696 "resize option only available "
1697 "for remount");
1698 return 0;
1699 }
1700 if (match_int(&args[0], &option) != 0)
1701 return 0;
1702 *n_blocks_count = option;
1703 break;
1704 case Opt_nobh:
1705 ext4_msg(sb, KERN_WARNING,
1706 "Ignoring deprecated nobh option");
1707 break;
1708 case Opt_bh:
1709 ext4_msg(sb, KERN_WARNING,
1710 "Ignoring deprecated bh option");
1711 break;
1712 case Opt_i_version:
1713 set_opt(sbi->s_mount_opt, I_VERSION);
1714 sb->s_flags |= MS_I_VERSION;
1715 break;
1716 case Opt_nodelalloc:
1717 clear_opt(sbi->s_mount_opt, DELALLOC);
1718 break;
1719 case Opt_stripe:
1720 if (match_int(&args[0], &option))
1721 return 0;
1722 if (option < 0)
1723 return 0;
1724 sbi->s_stripe = option;
1725 break;
1726 case Opt_delalloc:
1727 set_opt(sbi->s_mount_opt, DELALLOC);
1728 break;
1729 case Opt_block_validity:
1730 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1731 break;
1732 case Opt_noblock_validity:
1733 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1734 break;
1735 case Opt_inode_readahead_blks:
1736 if (match_int(&args[0], &option))
1737 return 0;
1738 if (option < 0 || option > (1 << 30))
1739 return 0;
1740 if (!is_power_of_2(option)) {
1741 ext4_msg(sb, KERN_ERR,
1742 "EXT4-fs: inode_readahead_blks"
1743 " must be a power of 2");
1744 return 0;
1745 }
1746 sbi->s_inode_readahead_blks = option;
1747 break;
1748 case Opt_journal_ioprio:
1749 if (match_int(&args[0], &option))
1750 return 0;
1751 if (option < 0 || option > 7)
1752 break;
1753 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1754 option);
1755 break;
1756 case Opt_noauto_da_alloc:
1757 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1758 break;
1759 case Opt_auto_da_alloc:
1760 if (args[0].from) {
1761 if (match_int(&args[0], &option))
1762 return 0;
1763 } else
1764 option = 1; /* No argument, default to 1 */
1765 if (option)
1766 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1767 else
1768 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1769 break;
1770 case Opt_discard:
1771 set_opt(sbi->s_mount_opt, DISCARD);
1772 break;
1773 case Opt_nodiscard:
1774 clear_opt(sbi->s_mount_opt, DISCARD);
1775 break;
1776 case Opt_dioread_nolock:
1777 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1778 break;
1779 case Opt_dioread_lock:
1780 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1781 break;
1782 case Opt_init_inode_table:
1783 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1784 if (args[0].from) {
1785 if (match_int(&args[0], &option))
1786 return 0;
1787 } else
1788 option = EXT4_DEF_LI_WAIT_MULT;
1789 if (option < 0)
1790 return 0;
1791 sbi->s_li_wait_mult = option;
1792 break;
1793 case Opt_noinit_inode_table:
1794 clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1795 break;
1796 default:
1797 ext4_msg(sb, KERN_ERR,
1798 "Unrecognized mount option \"%s\" "
1799 "or missing value", p);
1800 return 0;
1801 }
1802 }
1803 #ifdef CONFIG_QUOTA
1804 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1805 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1806 clear_opt(sbi->s_mount_opt, USRQUOTA);
1807
1808 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1809 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1810
1811 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1812 ext4_msg(sb, KERN_ERR, "old and new quota "
1813 "format mixing");
1814 return 0;
1815 }
1816
1817 if (!sbi->s_jquota_fmt) {
1818 ext4_msg(sb, KERN_ERR, "journaled quota format "
1819 "not specified");
1820 return 0;
1821 }
1822 } else {
1823 if (sbi->s_jquota_fmt) {
1824 ext4_msg(sb, KERN_ERR, "journaled quota format "
1825 "specified with no journaling "
1826 "enabled");
1827 return 0;
1828 }
1829 }
1830 #endif
1831 return 1;
1832 }
1833
1834 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1835 int read_only)
1836 {
1837 struct ext4_sb_info *sbi = EXT4_SB(sb);
1838 int res = 0;
1839
1840 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1841 ext4_msg(sb, KERN_ERR, "revision level too high, "
1842 "forcing read-only mode");
1843 res = MS_RDONLY;
1844 }
1845 if (read_only)
1846 return res;
1847 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1848 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1849 "running e2fsck is recommended");
1850 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1851 ext4_msg(sb, KERN_WARNING,
1852 "warning: mounting fs with errors, "
1853 "running e2fsck is recommended");
1854 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1855 le16_to_cpu(es->s_mnt_count) >=
1856 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1857 ext4_msg(sb, KERN_WARNING,
1858 "warning: maximal mount count reached, "
1859 "running e2fsck is recommended");
1860 else if (le32_to_cpu(es->s_checkinterval) &&
1861 (le32_to_cpu(es->s_lastcheck) +
1862 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1863 ext4_msg(sb, KERN_WARNING,
1864 "warning: checktime reached, "
1865 "running e2fsck is recommended");
1866 if (!sbi->s_journal)
1867 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1868 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1869 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1870 le16_add_cpu(&es->s_mnt_count, 1);
1871 es->s_mtime = cpu_to_le32(get_seconds());
1872 ext4_update_dynamic_rev(sb);
1873 if (sbi->s_journal)
1874 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1875
1876 ext4_commit_super(sb, 1);
1877 if (test_opt(sb, DEBUG))
1878 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1879 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1880 sb->s_blocksize,
1881 sbi->s_groups_count,
1882 EXT4_BLOCKS_PER_GROUP(sb),
1883 EXT4_INODES_PER_GROUP(sb),
1884 sbi->s_mount_opt);
1885
1886 return res;
1887 }
1888
1889 static int ext4_fill_flex_info(struct super_block *sb)
1890 {
1891 struct ext4_sb_info *sbi = EXT4_SB(sb);
1892 struct ext4_group_desc *gdp = NULL;
1893 ext4_group_t flex_group_count;
1894 ext4_group_t flex_group;
1895 int groups_per_flex = 0;
1896 size_t size;
1897 int i;
1898
1899 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1900 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1901
1902 if (groups_per_flex < 2) {
1903 sbi->s_log_groups_per_flex = 0;
1904 return 1;
1905 }
1906
1907 /* We allocate both existing and potentially added groups */
1908 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1909 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1910 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1911 size = flex_group_count * sizeof(struct flex_groups);
1912 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1913 if (sbi->s_flex_groups == NULL) {
1914 sbi->s_flex_groups = vmalloc(size);
1915 if (sbi->s_flex_groups)
1916 memset(sbi->s_flex_groups, 0, size);
1917 }
1918 if (sbi->s_flex_groups == NULL) {
1919 ext4_msg(sb, KERN_ERR, "not enough memory for "
1920 "%u flex groups", flex_group_count);
1921 goto failed;
1922 }
1923
1924 for (i = 0; i < sbi->s_groups_count; i++) {
1925 gdp = ext4_get_group_desc(sb, i, NULL);
1926
1927 flex_group = ext4_flex_group(sbi, i);
1928 atomic_add(ext4_free_inodes_count(sb, gdp),
1929 &sbi->s_flex_groups[flex_group].free_inodes);
1930 atomic_add(ext4_free_blks_count(sb, gdp),
1931 &sbi->s_flex_groups[flex_group].free_blocks);
1932 atomic_add(ext4_used_dirs_count(sb, gdp),
1933 &sbi->s_flex_groups[flex_group].used_dirs);
1934 }
1935
1936 return 1;
1937 failed:
1938 return 0;
1939 }
1940
1941 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1942 struct ext4_group_desc *gdp)
1943 {
1944 __u16 crc = 0;
1945
1946 if (sbi->s_es->s_feature_ro_compat &
1947 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1948 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1949 __le32 le_group = cpu_to_le32(block_group);
1950
1951 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1952 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1953 crc = crc16(crc, (__u8 *)gdp, offset);
1954 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1955 /* for checksum of struct ext4_group_desc do the rest...*/
1956 if ((sbi->s_es->s_feature_incompat &
1957 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1958 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1959 crc = crc16(crc, (__u8 *)gdp + offset,
1960 le16_to_cpu(sbi->s_es->s_desc_size) -
1961 offset);
1962 }
1963
1964 return cpu_to_le16(crc);
1965 }
1966
1967 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1968 struct ext4_group_desc *gdp)
1969 {
1970 if ((sbi->s_es->s_feature_ro_compat &
1971 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1972 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1973 return 0;
1974
1975 return 1;
1976 }
1977
1978 /* Called at mount-time, super-block is locked */
1979 static int ext4_check_descriptors(struct super_block *sb,
1980 ext4_group_t *first_not_zeroed)
1981 {
1982 struct ext4_sb_info *sbi = EXT4_SB(sb);
1983 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1984 ext4_fsblk_t last_block;
1985 ext4_fsblk_t block_bitmap;
1986 ext4_fsblk_t inode_bitmap;
1987 ext4_fsblk_t inode_table;
1988 int flexbg_flag = 0;
1989 ext4_group_t i, grp = sbi->s_groups_count;
1990
1991 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1992 flexbg_flag = 1;
1993
1994 ext4_debug("Checking group descriptors");
1995
1996 for (i = 0; i < sbi->s_groups_count; i++) {
1997 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1998
1999 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2000 last_block = ext4_blocks_count(sbi->s_es) - 1;
2001 else
2002 last_block = first_block +
2003 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2004
2005 if ((grp == sbi->s_groups_count) &&
2006 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2007 grp = i;
2008
2009 block_bitmap = ext4_block_bitmap(sb, gdp);
2010 if (block_bitmap < first_block || block_bitmap > last_block) {
2011 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2012 "Block bitmap for group %u not in group "
2013 "(block %llu)!", i, block_bitmap);
2014 return 0;
2015 }
2016 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2017 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2018 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2019 "Inode bitmap for group %u not in group "
2020 "(block %llu)!", i, inode_bitmap);
2021 return 0;
2022 }
2023 inode_table = ext4_inode_table(sb, gdp);
2024 if (inode_table < first_block ||
2025 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2026 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2027 "Inode table for group %u not in group "
2028 "(block %llu)!", i, inode_table);
2029 return 0;
2030 }
2031 ext4_lock_group(sb, i);
2032 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2033 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2034 "Checksum for group %u failed (%u!=%u)",
2035 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2036 gdp)), le16_to_cpu(gdp->bg_checksum));
2037 if (!(sb->s_flags & MS_RDONLY)) {
2038 ext4_unlock_group(sb, i);
2039 return 0;
2040 }
2041 }
2042 ext4_unlock_group(sb, i);
2043 if (!flexbg_flag)
2044 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2045 }
2046 if (NULL != first_not_zeroed)
2047 *first_not_zeroed = grp;
2048
2049 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2050 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2051 return 1;
2052 }
2053
2054 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2055 * the superblock) which were deleted from all directories, but held open by
2056 * a process at the time of a crash. We walk the list and try to delete these
2057 * inodes at recovery time (only with a read-write filesystem).
2058 *
2059 * In order to keep the orphan inode chain consistent during traversal (in
2060 * case of crash during recovery), we link each inode into the superblock
2061 * orphan list_head and handle it the same way as an inode deletion during
2062 * normal operation (which journals the operations for us).
2063 *
2064 * We only do an iget() and an iput() on each inode, which is very safe if we
2065 * accidentally point at an in-use or already deleted inode. The worst that
2066 * can happen in this case is that we get a "bit already cleared" message from
2067 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2068 * e2fsck was run on this filesystem, and it must have already done the orphan
2069 * inode cleanup for us, so we can safely abort without any further action.
2070 */
2071 static void ext4_orphan_cleanup(struct super_block *sb,
2072 struct ext4_super_block *es)
2073 {
2074 unsigned int s_flags = sb->s_flags;
2075 int nr_orphans = 0, nr_truncates = 0;
2076 #ifdef CONFIG_QUOTA
2077 int i;
2078 #endif
2079 if (!es->s_last_orphan) {
2080 jbd_debug(4, "no orphan inodes to clean up\n");
2081 return;
2082 }
2083
2084 if (bdev_read_only(sb->s_bdev)) {
2085 ext4_msg(sb, KERN_ERR, "write access "
2086 "unavailable, skipping orphan cleanup");
2087 return;
2088 }
2089
2090 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2091 if (es->s_last_orphan)
2092 jbd_debug(1, "Errors on filesystem, "
2093 "clearing orphan list.\n");
2094 es->s_last_orphan = 0;
2095 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2096 return;
2097 }
2098
2099 if (s_flags & MS_RDONLY) {
2100 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2101 sb->s_flags &= ~MS_RDONLY;
2102 }
2103 #ifdef CONFIG_QUOTA
2104 /* Needed for iput() to work correctly and not trash data */
2105 sb->s_flags |= MS_ACTIVE;
2106 /* Turn on quotas so that they are updated correctly */
2107 for (i = 0; i < MAXQUOTAS; i++) {
2108 if (EXT4_SB(sb)->s_qf_names[i]) {
2109 int ret = ext4_quota_on_mount(sb, i);
2110 if (ret < 0)
2111 ext4_msg(sb, KERN_ERR,
2112 "Cannot turn on journaled "
2113 "quota: error %d", ret);
2114 }
2115 }
2116 #endif
2117
2118 while (es->s_last_orphan) {
2119 struct inode *inode;
2120
2121 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2122 if (IS_ERR(inode)) {
2123 es->s_last_orphan = 0;
2124 break;
2125 }
2126
2127 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2128 dquot_initialize(inode);
2129 if (inode->i_nlink) {
2130 ext4_msg(sb, KERN_DEBUG,
2131 "%s: truncating inode %lu to %lld bytes",
2132 __func__, inode->i_ino, inode->i_size);
2133 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2134 inode->i_ino, inode->i_size);
2135 ext4_truncate(inode);
2136 nr_truncates++;
2137 } else {
2138 ext4_msg(sb, KERN_DEBUG,
2139 "%s: deleting unreferenced inode %lu",
2140 __func__, inode->i_ino);
2141 jbd_debug(2, "deleting unreferenced inode %lu\n",
2142 inode->i_ino);
2143 nr_orphans++;
2144 }
2145 iput(inode); /* The delete magic happens here! */
2146 }
2147
2148 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2149
2150 if (nr_orphans)
2151 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2152 PLURAL(nr_orphans));
2153 if (nr_truncates)
2154 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2155 PLURAL(nr_truncates));
2156 #ifdef CONFIG_QUOTA
2157 /* Turn quotas off */
2158 for (i = 0; i < MAXQUOTAS; i++) {
2159 if (sb_dqopt(sb)->files[i])
2160 dquot_quota_off(sb, i);
2161 }
2162 #endif
2163 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2164 }
2165
2166 /*
2167 * Maximal extent format file size.
2168 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2169 * extent format containers, within a sector_t, and within i_blocks
2170 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2171 * so that won't be a limiting factor.
2172 *
2173 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2174 */
2175 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2176 {
2177 loff_t res;
2178 loff_t upper_limit = MAX_LFS_FILESIZE;
2179
2180 /* small i_blocks in vfs inode? */
2181 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2182 /*
2183 * CONFIG_LBDAF is not enabled implies the inode
2184 * i_block represent total blocks in 512 bytes
2185 * 32 == size of vfs inode i_blocks * 8
2186 */
2187 upper_limit = (1LL << 32) - 1;
2188
2189 /* total blocks in file system block size */
2190 upper_limit >>= (blkbits - 9);
2191 upper_limit <<= blkbits;
2192 }
2193
2194 /* 32-bit extent-start container, ee_block */
2195 res = 1LL << 32;
2196 res <<= blkbits;
2197 res -= 1;
2198
2199 /* Sanity check against vm- & vfs- imposed limits */
2200 if (res > upper_limit)
2201 res = upper_limit;
2202
2203 return res;
2204 }
2205
2206 /*
2207 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2208 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2209 * We need to be 1 filesystem block less than the 2^48 sector limit.
2210 */
2211 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2212 {
2213 loff_t res = EXT4_NDIR_BLOCKS;
2214 int meta_blocks;
2215 loff_t upper_limit;
2216 /* This is calculated to be the largest file size for a dense, block
2217 * mapped file such that the file's total number of 512-byte sectors,
2218 * including data and all indirect blocks, does not exceed (2^48 - 1).
2219 *
2220 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2221 * number of 512-byte sectors of the file.
2222 */
2223
2224 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2225 /*
2226 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2227 * the inode i_block field represents total file blocks in
2228 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2229 */
2230 upper_limit = (1LL << 32) - 1;
2231
2232 /* total blocks in file system block size */
2233 upper_limit >>= (bits - 9);
2234
2235 } else {
2236 /*
2237 * We use 48 bit ext4_inode i_blocks
2238 * With EXT4_HUGE_FILE_FL set the i_blocks
2239 * represent total number of blocks in
2240 * file system block size
2241 */
2242 upper_limit = (1LL << 48) - 1;
2243
2244 }
2245
2246 /* indirect blocks */
2247 meta_blocks = 1;
2248 /* double indirect blocks */
2249 meta_blocks += 1 + (1LL << (bits-2));
2250 /* tripple indirect blocks */
2251 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2252
2253 upper_limit -= meta_blocks;
2254 upper_limit <<= bits;
2255
2256 res += 1LL << (bits-2);
2257 res += 1LL << (2*(bits-2));
2258 res += 1LL << (3*(bits-2));
2259 res <<= bits;
2260 if (res > upper_limit)
2261 res = upper_limit;
2262
2263 if (res > MAX_LFS_FILESIZE)
2264 res = MAX_LFS_FILESIZE;
2265
2266 return res;
2267 }
2268
2269 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2270 ext4_fsblk_t logical_sb_block, int nr)
2271 {
2272 struct ext4_sb_info *sbi = EXT4_SB(sb);
2273 ext4_group_t bg, first_meta_bg;
2274 int has_super = 0;
2275
2276 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2277
2278 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2279 nr < first_meta_bg)
2280 return logical_sb_block + nr + 1;
2281 bg = sbi->s_desc_per_block * nr;
2282 if (ext4_bg_has_super(sb, bg))
2283 has_super = 1;
2284
2285 return (has_super + ext4_group_first_block_no(sb, bg));
2286 }
2287
2288 /**
2289 * ext4_get_stripe_size: Get the stripe size.
2290 * @sbi: In memory super block info
2291 *
2292 * If we have specified it via mount option, then
2293 * use the mount option value. If the value specified at mount time is
2294 * greater than the blocks per group use the super block value.
2295 * If the super block value is greater than blocks per group return 0.
2296 * Allocator needs it be less than blocks per group.
2297 *
2298 */
2299 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2300 {
2301 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2302 unsigned long stripe_width =
2303 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2304
2305 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2306 return sbi->s_stripe;
2307
2308 if (stripe_width <= sbi->s_blocks_per_group)
2309 return stripe_width;
2310
2311 if (stride <= sbi->s_blocks_per_group)
2312 return stride;
2313
2314 return 0;
2315 }
2316
2317 /* sysfs supprt */
2318
2319 struct ext4_attr {
2320 struct attribute attr;
2321 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2322 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2323 const char *, size_t);
2324 int offset;
2325 };
2326
2327 static int parse_strtoul(const char *buf,
2328 unsigned long max, unsigned long *value)
2329 {
2330 char *endp;
2331
2332 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2333 endp = skip_spaces(endp);
2334 if (*endp || *value > max)
2335 return -EINVAL;
2336
2337 return 0;
2338 }
2339
2340 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2341 struct ext4_sb_info *sbi,
2342 char *buf)
2343 {
2344 return snprintf(buf, PAGE_SIZE, "%llu\n",
2345 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2346 }
2347
2348 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2349 struct ext4_sb_info *sbi, char *buf)
2350 {
2351 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2352
2353 if (!sb->s_bdev->bd_part)
2354 return snprintf(buf, PAGE_SIZE, "0\n");
2355 return snprintf(buf, PAGE_SIZE, "%lu\n",
2356 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2357 sbi->s_sectors_written_start) >> 1);
2358 }
2359
2360 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2361 struct ext4_sb_info *sbi, char *buf)
2362 {
2363 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2364
2365 if (!sb->s_bdev->bd_part)
2366 return snprintf(buf, PAGE_SIZE, "0\n");
2367 return snprintf(buf, PAGE_SIZE, "%llu\n",
2368 (unsigned long long)(sbi->s_kbytes_written +
2369 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2370 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2371 }
2372
2373 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2374 struct ext4_sb_info *sbi,
2375 const char *buf, size_t count)
2376 {
2377 unsigned long t;
2378
2379 if (parse_strtoul(buf, 0x40000000, &t))
2380 return -EINVAL;
2381
2382 if (!is_power_of_2(t))
2383 return -EINVAL;
2384
2385 sbi->s_inode_readahead_blks = t;
2386 return count;
2387 }
2388
2389 static ssize_t sbi_ui_show(struct ext4_attr *a,
2390 struct ext4_sb_info *sbi, char *buf)
2391 {
2392 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2393
2394 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2395 }
2396
2397 static ssize_t sbi_ui_store(struct ext4_attr *a,
2398 struct ext4_sb_info *sbi,
2399 const char *buf, size_t count)
2400 {
2401 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2402 unsigned long t;
2403
2404 if (parse_strtoul(buf, 0xffffffff, &t))
2405 return -EINVAL;
2406 *ui = t;
2407 return count;
2408 }
2409
2410 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2411 static struct ext4_attr ext4_attr_##_name = { \
2412 .attr = {.name = __stringify(_name), .mode = _mode }, \
2413 .show = _show, \
2414 .store = _store, \
2415 .offset = offsetof(struct ext4_sb_info, _elname), \
2416 }
2417 #define EXT4_ATTR(name, mode, show, store) \
2418 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2419
2420 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2421 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2422 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2423 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2424 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2425 #define ATTR_LIST(name) &ext4_attr_##name.attr
2426
2427 EXT4_RO_ATTR(delayed_allocation_blocks);
2428 EXT4_RO_ATTR(session_write_kbytes);
2429 EXT4_RO_ATTR(lifetime_write_kbytes);
2430 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2431 inode_readahead_blks_store, s_inode_readahead_blks);
2432 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2433 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2434 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2435 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2436 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2437 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2438 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2439 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2440
2441 static struct attribute *ext4_attrs[] = {
2442 ATTR_LIST(delayed_allocation_blocks),
2443 ATTR_LIST(session_write_kbytes),
2444 ATTR_LIST(lifetime_write_kbytes),
2445 ATTR_LIST(inode_readahead_blks),
2446 ATTR_LIST(inode_goal),
2447 ATTR_LIST(mb_stats),
2448 ATTR_LIST(mb_max_to_scan),
2449 ATTR_LIST(mb_min_to_scan),
2450 ATTR_LIST(mb_order2_req),
2451 ATTR_LIST(mb_stream_req),
2452 ATTR_LIST(mb_group_prealloc),
2453 ATTR_LIST(max_writeback_mb_bump),
2454 NULL,
2455 };
2456
2457 /* Features this copy of ext4 supports */
2458 EXT4_INFO_ATTR(lazy_itable_init);
2459 EXT4_INFO_ATTR(batched_discard);
2460
2461 static struct attribute *ext4_feat_attrs[] = {
2462 ATTR_LIST(lazy_itable_init),
2463 ATTR_LIST(batched_discard),
2464 NULL,
2465 };
2466
2467 static ssize_t ext4_attr_show(struct kobject *kobj,
2468 struct attribute *attr, char *buf)
2469 {
2470 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2471 s_kobj);
2472 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2473
2474 return a->show ? a->show(a, sbi, buf) : 0;
2475 }
2476
2477 static ssize_t ext4_attr_store(struct kobject *kobj,
2478 struct attribute *attr,
2479 const char *buf, size_t len)
2480 {
2481 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2482 s_kobj);
2483 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2484
2485 return a->store ? a->store(a, sbi, buf, len) : 0;
2486 }
2487
2488 static void ext4_sb_release(struct kobject *kobj)
2489 {
2490 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2491 s_kobj);
2492 complete(&sbi->s_kobj_unregister);
2493 }
2494
2495 static const struct sysfs_ops ext4_attr_ops = {
2496 .show = ext4_attr_show,
2497 .store = ext4_attr_store,
2498 };
2499
2500 static struct kobj_type ext4_ktype = {
2501 .default_attrs = ext4_attrs,
2502 .sysfs_ops = &ext4_attr_ops,
2503 .release = ext4_sb_release,
2504 };
2505
2506 static void ext4_feat_release(struct kobject *kobj)
2507 {
2508 complete(&ext4_feat->f_kobj_unregister);
2509 }
2510
2511 static struct kobj_type ext4_feat_ktype = {
2512 .default_attrs = ext4_feat_attrs,
2513 .sysfs_ops = &ext4_attr_ops,
2514 .release = ext4_feat_release,
2515 };
2516
2517 /*
2518 * Check whether this filesystem can be mounted based on
2519 * the features present and the RDONLY/RDWR mount requested.
2520 * Returns 1 if this filesystem can be mounted as requested,
2521 * 0 if it cannot be.
2522 */
2523 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2524 {
2525 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2526 ext4_msg(sb, KERN_ERR,
2527 "Couldn't mount because of "
2528 "unsupported optional features (%x)",
2529 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2530 ~EXT4_FEATURE_INCOMPAT_SUPP));
2531 return 0;
2532 }
2533
2534 if (readonly)
2535 return 1;
2536
2537 /* Check that feature set is OK for a read-write mount */
2538 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2539 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2540 "unsupported optional features (%x)",
2541 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2542 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2543 return 0;
2544 }
2545 /*
2546 * Large file size enabled file system can only be mounted
2547 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2548 */
2549 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2550 if (sizeof(blkcnt_t) < sizeof(u64)) {
2551 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2552 "cannot be mounted RDWR without "
2553 "CONFIG_LBDAF");
2554 return 0;
2555 }
2556 }
2557 return 1;
2558 }
2559
2560 /*
2561 * This function is called once a day if we have errors logged
2562 * on the file system
2563 */
2564 static void print_daily_error_info(unsigned long arg)
2565 {
2566 struct super_block *sb = (struct super_block *) arg;
2567 struct ext4_sb_info *sbi;
2568 struct ext4_super_block *es;
2569
2570 sbi = EXT4_SB(sb);
2571 es = sbi->s_es;
2572
2573 if (es->s_error_count)
2574 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2575 le32_to_cpu(es->s_error_count));
2576 if (es->s_first_error_time) {
2577 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2578 sb->s_id, le32_to_cpu(es->s_first_error_time),
2579 (int) sizeof(es->s_first_error_func),
2580 es->s_first_error_func,
2581 le32_to_cpu(es->s_first_error_line));
2582 if (es->s_first_error_ino)
2583 printk(": inode %u",
2584 le32_to_cpu(es->s_first_error_ino));
2585 if (es->s_first_error_block)
2586 printk(": block %llu", (unsigned long long)
2587 le64_to_cpu(es->s_first_error_block));
2588 printk("\n");
2589 }
2590 if (es->s_last_error_time) {
2591 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2592 sb->s_id, le32_to_cpu(es->s_last_error_time),
2593 (int) sizeof(es->s_last_error_func),
2594 es->s_last_error_func,
2595 le32_to_cpu(es->s_last_error_line));
2596 if (es->s_last_error_ino)
2597 printk(": inode %u",
2598 le32_to_cpu(es->s_last_error_ino));
2599 if (es->s_last_error_block)
2600 printk(": block %llu", (unsigned long long)
2601 le64_to_cpu(es->s_last_error_block));
2602 printk("\n");
2603 }
2604 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2605 }
2606
2607 static void ext4_lazyinode_timeout(unsigned long data)
2608 {
2609 struct task_struct *p = (struct task_struct *)data;
2610 wake_up_process(p);
2611 }
2612
2613 /* Find next suitable group and run ext4_init_inode_table */
2614 static int ext4_run_li_request(struct ext4_li_request *elr)
2615 {
2616 struct ext4_group_desc *gdp = NULL;
2617 ext4_group_t group, ngroups;
2618 struct super_block *sb;
2619 unsigned long timeout = 0;
2620 int ret = 0;
2621
2622 sb = elr->lr_super;
2623 ngroups = EXT4_SB(sb)->s_groups_count;
2624
2625 for (group = elr->lr_next_group; group < ngroups; group++) {
2626 gdp = ext4_get_group_desc(sb, group, NULL);
2627 if (!gdp) {
2628 ret = 1;
2629 break;
2630 }
2631
2632 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2633 break;
2634 }
2635
2636 if (group == ngroups)
2637 ret = 1;
2638
2639 if (!ret) {
2640 timeout = jiffies;
2641 ret = ext4_init_inode_table(sb, group,
2642 elr->lr_timeout ? 0 : 1);
2643 if (elr->lr_timeout == 0) {
2644 timeout = jiffies - timeout;
2645 if (elr->lr_sbi->s_li_wait_mult)
2646 timeout *= elr->lr_sbi->s_li_wait_mult;
2647 else
2648 timeout *= 20;
2649 elr->lr_timeout = timeout;
2650 }
2651 elr->lr_next_sched = jiffies + elr->lr_timeout;
2652 elr->lr_next_group = group + 1;
2653 }
2654
2655 return ret;
2656 }
2657
2658 /*
2659 * Remove lr_request from the list_request and free the
2660 * request tructure. Should be called with li_list_mtx held
2661 */
2662 static void ext4_remove_li_request(struct ext4_li_request *elr)
2663 {
2664 struct ext4_sb_info *sbi;
2665
2666 if (!elr)
2667 return;
2668
2669 sbi = elr->lr_sbi;
2670
2671 list_del(&elr->lr_request);
2672 sbi->s_li_request = NULL;
2673 kfree(elr);
2674 }
2675
2676 static void ext4_unregister_li_request(struct super_block *sb)
2677 {
2678 struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request;
2679
2680 if (!ext4_li_info)
2681 return;
2682
2683 mutex_lock(&ext4_li_info->li_list_mtx);
2684 ext4_remove_li_request(elr);
2685 mutex_unlock(&ext4_li_info->li_list_mtx);
2686 }
2687
2688 /*
2689 * This is the function where ext4lazyinit thread lives. It walks
2690 * through the request list searching for next scheduled filesystem.
2691 * When such a fs is found, run the lazy initialization request
2692 * (ext4_rn_li_request) and keep track of the time spend in this
2693 * function. Based on that time we compute next schedule time of
2694 * the request. When walking through the list is complete, compute
2695 * next waking time and put itself into sleep.
2696 */
2697 static int ext4_lazyinit_thread(void *arg)
2698 {
2699 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2700 struct list_head *pos, *n;
2701 struct ext4_li_request *elr;
2702 unsigned long next_wakeup;
2703 DEFINE_WAIT(wait);
2704
2705 BUG_ON(NULL == eli);
2706
2707 eli->li_timer.data = (unsigned long)current;
2708 eli->li_timer.function = ext4_lazyinode_timeout;
2709
2710 eli->li_task = current;
2711 wake_up(&eli->li_wait_task);
2712
2713 cont_thread:
2714 while (true) {
2715 next_wakeup = MAX_JIFFY_OFFSET;
2716
2717 mutex_lock(&eli->li_list_mtx);
2718 if (list_empty(&eli->li_request_list)) {
2719 mutex_unlock(&eli->li_list_mtx);
2720 goto exit_thread;
2721 }
2722
2723 list_for_each_safe(pos, n, &eli->li_request_list) {
2724 elr = list_entry(pos, struct ext4_li_request,
2725 lr_request);
2726
2727 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2728 if (ext4_run_li_request(elr) != 0) {
2729 /* error, remove the lazy_init job */
2730 ext4_remove_li_request(elr);
2731 continue;
2732 }
2733 }
2734
2735 if (time_before(elr->lr_next_sched, next_wakeup))
2736 next_wakeup = elr->lr_next_sched;
2737 }
2738 mutex_unlock(&eli->li_list_mtx);
2739
2740 if (freezing(current))
2741 refrigerator();
2742
2743 if ((time_after_eq(jiffies, next_wakeup)) ||
2744 (MAX_JIFFY_OFFSET == next_wakeup)) {
2745 cond_resched();
2746 continue;
2747 }
2748
2749 eli->li_timer.expires = next_wakeup;
2750 add_timer(&eli->li_timer);
2751 prepare_to_wait(&eli->li_wait_daemon, &wait,
2752 TASK_INTERRUPTIBLE);
2753 if (time_before(jiffies, next_wakeup))
2754 schedule();
2755 finish_wait(&eli->li_wait_daemon, &wait);
2756 }
2757
2758 exit_thread:
2759 /*
2760 * It looks like the request list is empty, but we need
2761 * to check it under the li_list_mtx lock, to prevent any
2762 * additions into it, and of course we should lock ext4_li_mtx
2763 * to atomically free the list and ext4_li_info, because at
2764 * this point another ext4 filesystem could be registering
2765 * new one.
2766 */
2767 mutex_lock(&ext4_li_mtx);
2768 mutex_lock(&eli->li_list_mtx);
2769 if (!list_empty(&eli->li_request_list)) {
2770 mutex_unlock(&eli->li_list_mtx);
2771 mutex_unlock(&ext4_li_mtx);
2772 goto cont_thread;
2773 }
2774 mutex_unlock(&eli->li_list_mtx);
2775 del_timer_sync(&ext4_li_info->li_timer);
2776 eli->li_task = NULL;
2777 wake_up(&eli->li_wait_task);
2778
2779 kfree(ext4_li_info);
2780 ext4_li_info = NULL;
2781 mutex_unlock(&ext4_li_mtx);
2782
2783 return 0;
2784 }
2785
2786 static void ext4_clear_request_list(void)
2787 {
2788 struct list_head *pos, *n;
2789 struct ext4_li_request *elr;
2790
2791 mutex_lock(&ext4_li_info->li_list_mtx);
2792 if (list_empty(&ext4_li_info->li_request_list))
2793 return;
2794
2795 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2796 elr = list_entry(pos, struct ext4_li_request,
2797 lr_request);
2798 ext4_remove_li_request(elr);
2799 }
2800 mutex_unlock(&ext4_li_info->li_list_mtx);
2801 }
2802
2803 static int ext4_run_lazyinit_thread(void)
2804 {
2805 struct task_struct *t;
2806
2807 t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
2808 if (IS_ERR(t)) {
2809 int err = PTR_ERR(t);
2810 ext4_clear_request_list();
2811 del_timer_sync(&ext4_li_info->li_timer);
2812 kfree(ext4_li_info);
2813 ext4_li_info = NULL;
2814 printk(KERN_CRIT "EXT4: error %d creating inode table "
2815 "initialization thread\n",
2816 err);
2817 return err;
2818 }
2819 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2820
2821 wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL);
2822 return 0;
2823 }
2824
2825 /*
2826 * Check whether it make sense to run itable init. thread or not.
2827 * If there is at least one uninitialized inode table, return
2828 * corresponding group number, else the loop goes through all
2829 * groups and return total number of groups.
2830 */
2831 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2832 {
2833 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2834 struct ext4_group_desc *gdp = NULL;
2835
2836 for (group = 0; group < ngroups; group++) {
2837 gdp = ext4_get_group_desc(sb, group, NULL);
2838 if (!gdp)
2839 continue;
2840
2841 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2842 break;
2843 }
2844
2845 return group;
2846 }
2847
2848 static int ext4_li_info_new(void)
2849 {
2850 struct ext4_lazy_init *eli = NULL;
2851
2852 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2853 if (!eli)
2854 return -ENOMEM;
2855
2856 eli->li_task = NULL;
2857 INIT_LIST_HEAD(&eli->li_request_list);
2858 mutex_init(&eli->li_list_mtx);
2859
2860 init_waitqueue_head(&eli->li_wait_daemon);
2861 init_waitqueue_head(&eli->li_wait_task);
2862 init_timer(&eli->li_timer);
2863 eli->li_state |= EXT4_LAZYINIT_QUIT;
2864
2865 ext4_li_info = eli;
2866
2867 return 0;
2868 }
2869
2870 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2871 ext4_group_t start)
2872 {
2873 struct ext4_sb_info *sbi = EXT4_SB(sb);
2874 struct ext4_li_request *elr;
2875 unsigned long rnd;
2876
2877 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2878 if (!elr)
2879 return NULL;
2880
2881 elr->lr_super = sb;
2882 elr->lr_sbi = sbi;
2883 elr->lr_next_group = start;
2884
2885 /*
2886 * Randomize first schedule time of the request to
2887 * spread the inode table initialization requests
2888 * better.
2889 */
2890 get_random_bytes(&rnd, sizeof(rnd));
2891 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2892 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2893
2894 return elr;
2895 }
2896
2897 static int ext4_register_li_request(struct super_block *sb,
2898 ext4_group_t first_not_zeroed)
2899 {
2900 struct ext4_sb_info *sbi = EXT4_SB(sb);
2901 struct ext4_li_request *elr;
2902 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2903 int ret;
2904
2905 if (sbi->s_li_request != NULL)
2906 return 0;
2907
2908 if (first_not_zeroed == ngroups ||
2909 (sb->s_flags & MS_RDONLY) ||
2910 !test_opt(sb, INIT_INODE_TABLE)) {
2911 sbi->s_li_request = NULL;
2912 return 0;
2913 }
2914
2915 if (first_not_zeroed == ngroups) {
2916 sbi->s_li_request = NULL;
2917 return 0;
2918 }
2919
2920 elr = ext4_li_request_new(sb, first_not_zeroed);
2921 if (!elr)
2922 return -ENOMEM;
2923
2924 mutex_lock(&ext4_li_mtx);
2925
2926 if (NULL == ext4_li_info) {
2927 ret = ext4_li_info_new();
2928 if (ret)
2929 goto out;
2930 }
2931
2932 mutex_lock(&ext4_li_info->li_list_mtx);
2933 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2934 mutex_unlock(&ext4_li_info->li_list_mtx);
2935
2936 sbi->s_li_request = elr;
2937
2938 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2939 ret = ext4_run_lazyinit_thread();
2940 if (ret)
2941 goto out;
2942 }
2943 out:
2944 mutex_unlock(&ext4_li_mtx);
2945 if (ret)
2946 kfree(elr);
2947 return ret;
2948 }
2949
2950 /*
2951 * We do not need to lock anything since this is called on
2952 * module unload.
2953 */
2954 static void ext4_destroy_lazyinit_thread(void)
2955 {
2956 /*
2957 * If thread exited earlier
2958 * there's nothing to be done.
2959 */
2960 if (!ext4_li_info)
2961 return;
2962
2963 ext4_clear_request_list();
2964
2965 while (ext4_li_info->li_task) {
2966 wake_up(&ext4_li_info->li_wait_daemon);
2967 wait_event(ext4_li_info->li_wait_task,
2968 ext4_li_info->li_task == NULL);
2969 }
2970 }
2971
2972 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2973 __releases(kernel_lock)
2974 __acquires(kernel_lock)
2975 {
2976 char *orig_data = kstrdup(data, GFP_KERNEL);
2977 struct buffer_head *bh;
2978 struct ext4_super_block *es = NULL;
2979 struct ext4_sb_info *sbi;
2980 ext4_fsblk_t block;
2981 ext4_fsblk_t sb_block = get_sb_block(&data);
2982 ext4_fsblk_t logical_sb_block;
2983 unsigned long offset = 0;
2984 unsigned long journal_devnum = 0;
2985 unsigned long def_mount_opts;
2986 struct inode *root;
2987 char *cp;
2988 const char *descr;
2989 int ret = -ENOMEM;
2990 int blocksize;
2991 unsigned int db_count;
2992 unsigned int i;
2993 int needs_recovery, has_huge_files;
2994 __u64 blocks_count;
2995 int err;
2996 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2997 ext4_group_t first_not_zeroed;
2998
2999 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3000 if (!sbi)
3001 goto out_free_orig;
3002
3003 sbi->s_blockgroup_lock =
3004 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3005 if (!sbi->s_blockgroup_lock) {
3006 kfree(sbi);
3007 goto out_free_orig;
3008 }
3009 sb->s_fs_info = sbi;
3010 sbi->s_mount_opt = 0;
3011 sbi->s_resuid = EXT4_DEF_RESUID;
3012 sbi->s_resgid = EXT4_DEF_RESGID;
3013 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3014 sbi->s_sb_block = sb_block;
3015 if (sb->s_bdev->bd_part)
3016 sbi->s_sectors_written_start =
3017 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3018
3019 /* Cleanup superblock name */
3020 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3021 *cp = '!';
3022
3023 ret = -EINVAL;
3024 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3025 if (!blocksize) {
3026 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3027 goto out_fail;
3028 }
3029
3030 /*
3031 * The ext4 superblock will not be buffer aligned for other than 1kB
3032 * block sizes. We need to calculate the offset from buffer start.
3033 */
3034 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3035 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3036 offset = do_div(logical_sb_block, blocksize);
3037 } else {
3038 logical_sb_block = sb_block;
3039 }
3040
3041 if (!(bh = sb_bread(sb, logical_sb_block))) {
3042 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3043 goto out_fail;
3044 }
3045 /*
3046 * Note: s_es must be initialized as soon as possible because
3047 * some ext4 macro-instructions depend on its value
3048 */
3049 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3050 sbi->s_es = es;
3051 sb->s_magic = le16_to_cpu(es->s_magic);
3052 if (sb->s_magic != EXT4_SUPER_MAGIC)
3053 goto cantfind_ext4;
3054 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3055
3056 /* Set defaults before we parse the mount options */
3057 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3058 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
3059 if (def_mount_opts & EXT4_DEFM_DEBUG)
3060 set_opt(sbi->s_mount_opt, DEBUG);
3061 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3062 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3063 "2.6.38");
3064 set_opt(sbi->s_mount_opt, GRPID);
3065 }
3066 if (def_mount_opts & EXT4_DEFM_UID16)
3067 set_opt(sbi->s_mount_opt, NO_UID32);
3068 #ifdef CONFIG_EXT4_FS_XATTR
3069 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
3070 set_opt(sbi->s_mount_opt, XATTR_USER);
3071 #endif
3072 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3073 if (def_mount_opts & EXT4_DEFM_ACL)
3074 set_opt(sbi->s_mount_opt, POSIX_ACL);
3075 #endif
3076 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3077 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3078 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3079 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3080 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3081 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3082
3083 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3084 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
3085 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3086 set_opt(sbi->s_mount_opt, ERRORS_CONT);
3087 else
3088 set_opt(sbi->s_mount_opt, ERRORS_RO);
3089 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3090 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
3091 if (def_mount_opts & EXT4_DEFM_DISCARD)
3092 set_opt(sbi->s_mount_opt, DISCARD);
3093
3094 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3095 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3096 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3097 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3098 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3099
3100 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3101 set_opt(sbi->s_mount_opt, BARRIER);
3102
3103 /*
3104 * enable delayed allocation by default
3105 * Use -o nodelalloc to turn it off
3106 */
3107 if (!IS_EXT3_SB(sb) &&
3108 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3109 set_opt(sbi->s_mount_opt, DELALLOC);
3110
3111 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3112 &journal_devnum, &journal_ioprio, NULL, 0)) {
3113 ext4_msg(sb, KERN_WARNING,
3114 "failed to parse options in superblock: %s",
3115 sbi->s_es->s_mount_opts);
3116 }
3117 if (!parse_options((char *) data, sb, &journal_devnum,
3118 &journal_ioprio, NULL, 0))
3119 goto failed_mount;
3120
3121 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3122 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3123
3124 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3125 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3126 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3127 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3128 ext4_msg(sb, KERN_WARNING,
3129 "feature flags set on rev 0 fs, "
3130 "running e2fsck is recommended");
3131
3132 /*
3133 * Check feature flags regardless of the revision level, since we
3134 * previously didn't change the revision level when setting the flags,
3135 * so there is a chance incompat flags are set on a rev 0 filesystem.
3136 */
3137 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3138 goto failed_mount;
3139
3140 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3141
3142 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3143 blocksize > EXT4_MAX_BLOCK_SIZE) {
3144 ext4_msg(sb, KERN_ERR,
3145 "Unsupported filesystem blocksize %d", blocksize);
3146 goto failed_mount;
3147 }
3148
3149 if (sb->s_blocksize != blocksize) {
3150 /* Validate the filesystem blocksize */
3151 if (!sb_set_blocksize(sb, blocksize)) {
3152 ext4_msg(sb, KERN_ERR, "bad block size %d",
3153 blocksize);
3154 goto failed_mount;
3155 }
3156
3157 brelse(bh);
3158 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3159 offset = do_div(logical_sb_block, blocksize);
3160 bh = sb_bread(sb, logical_sb_block);
3161 if (!bh) {
3162 ext4_msg(sb, KERN_ERR,
3163 "Can't read superblock on 2nd try");
3164 goto failed_mount;
3165 }
3166 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3167 sbi->s_es = es;
3168 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3169 ext4_msg(sb, KERN_ERR,
3170 "Magic mismatch, very weird!");
3171 goto failed_mount;
3172 }
3173 }
3174
3175 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3176 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3177 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3178 has_huge_files);
3179 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3180
3181 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3182 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3183 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3184 } else {
3185 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3186 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3187 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3188 (!is_power_of_2(sbi->s_inode_size)) ||
3189 (sbi->s_inode_size > blocksize)) {
3190 ext4_msg(sb, KERN_ERR,
3191 "unsupported inode size: %d",
3192 sbi->s_inode_size);
3193 goto failed_mount;
3194 }
3195 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3196 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3197 }
3198
3199 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3200 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3201 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3202 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3203 !is_power_of_2(sbi->s_desc_size)) {
3204 ext4_msg(sb, KERN_ERR,
3205 "unsupported descriptor size %lu",
3206 sbi->s_desc_size);
3207 goto failed_mount;
3208 }
3209 } else
3210 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3211
3212 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3213 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3214 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3215 goto cantfind_ext4;
3216
3217 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3218 if (sbi->s_inodes_per_block == 0)
3219 goto cantfind_ext4;
3220 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3221 sbi->s_inodes_per_block;
3222 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3223 sbi->s_sbh = bh;
3224 sbi->s_mount_state = le16_to_cpu(es->s_state);
3225 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3226 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3227
3228 for (i = 0; i < 4; i++)
3229 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3230 sbi->s_def_hash_version = es->s_def_hash_version;
3231 i = le32_to_cpu(es->s_flags);
3232 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3233 sbi->s_hash_unsigned = 3;
3234 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3235 #ifdef __CHAR_UNSIGNED__
3236 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3237 sbi->s_hash_unsigned = 3;
3238 #else
3239 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3240 #endif
3241 sb->s_dirt = 1;
3242 }
3243
3244 if (sbi->s_blocks_per_group > blocksize * 8) {
3245 ext4_msg(sb, KERN_ERR,
3246 "#blocks per group too big: %lu",
3247 sbi->s_blocks_per_group);
3248 goto failed_mount;
3249 }
3250 if (sbi->s_inodes_per_group > blocksize * 8) {
3251 ext4_msg(sb, KERN_ERR,
3252 "#inodes per group too big: %lu",
3253 sbi->s_inodes_per_group);
3254 goto failed_mount;
3255 }
3256
3257 /*
3258 * Test whether we have more sectors than will fit in sector_t,
3259 * and whether the max offset is addressable by the page cache.
3260 */
3261 ret = generic_check_addressable(sb->s_blocksize_bits,
3262 ext4_blocks_count(es));
3263 if (ret) {
3264 ext4_msg(sb, KERN_ERR, "filesystem"
3265 " too large to mount safely on this system");
3266 if (sizeof(sector_t) < 8)
3267 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3268 goto failed_mount;
3269 }
3270
3271 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3272 goto cantfind_ext4;
3273
3274 /* check blocks count against device size */
3275 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3276 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3277 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3278 "exceeds size of device (%llu blocks)",
3279 ext4_blocks_count(es), blocks_count);
3280 goto failed_mount;
3281 }
3282
3283 /*
3284 * It makes no sense for the first data block to be beyond the end
3285 * of the filesystem.
3286 */
3287 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3288 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3289 "block %u is beyond end of filesystem (%llu)",
3290 le32_to_cpu(es->s_first_data_block),
3291 ext4_blocks_count(es));
3292 goto failed_mount;
3293 }
3294 blocks_count = (ext4_blocks_count(es) -
3295 le32_to_cpu(es->s_first_data_block) +
3296 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3297 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3298 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3299 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3300 "(block count %llu, first data block %u, "
3301 "blocks per group %lu)", sbi->s_groups_count,
3302 ext4_blocks_count(es),
3303 le32_to_cpu(es->s_first_data_block),
3304 EXT4_BLOCKS_PER_GROUP(sb));
3305 goto failed_mount;
3306 }
3307 sbi->s_groups_count = blocks_count;
3308 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3309 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3310 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3311 EXT4_DESC_PER_BLOCK(sb);
3312 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
3313 GFP_KERNEL);
3314 if (sbi->s_group_desc == NULL) {
3315 ext4_msg(sb, KERN_ERR, "not enough memory");
3316 goto failed_mount;
3317 }
3318
3319 #ifdef CONFIG_PROC_FS
3320 if (ext4_proc_root)
3321 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3322 #endif
3323
3324 bgl_lock_init(sbi->s_blockgroup_lock);
3325
3326 for (i = 0; i < db_count; i++) {
3327 block = descriptor_loc(sb, logical_sb_block, i);
3328 sbi->s_group_desc[i] = sb_bread(sb, block);
3329 if (!sbi->s_group_desc[i]) {
3330 ext4_msg(sb, KERN_ERR,
3331 "can't read group descriptor %d", i);
3332 db_count = i;
3333 goto failed_mount2;
3334 }
3335 }
3336 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3337 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3338 goto failed_mount2;
3339 }
3340 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3341 if (!ext4_fill_flex_info(sb)) {
3342 ext4_msg(sb, KERN_ERR,
3343 "unable to initialize "
3344 "flex_bg meta info!");
3345 goto failed_mount2;
3346 }
3347
3348 sbi->s_gdb_count = db_count;
3349 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3350 spin_lock_init(&sbi->s_next_gen_lock);
3351
3352 err = percpu_counter_init(&sbi->s_freeblocks_counter,
3353 ext4_count_free_blocks(sb));
3354 if (!err) {
3355 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3356 ext4_count_free_inodes(sb));
3357 }
3358 if (!err) {
3359 err = percpu_counter_init(&sbi->s_dirs_counter,
3360 ext4_count_dirs(sb));
3361 }
3362 if (!err) {
3363 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3364 }
3365 if (err) {
3366 ext4_msg(sb, KERN_ERR, "insufficient memory");
3367 goto failed_mount3;
3368 }
3369
3370 sbi->s_stripe = ext4_get_stripe_size(sbi);
3371 sbi->s_max_writeback_mb_bump = 128;
3372
3373 /*
3374 * set up enough so that it can read an inode
3375 */
3376 if (!test_opt(sb, NOLOAD) &&
3377 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3378 sb->s_op = &ext4_sops;
3379 else
3380 sb->s_op = &ext4_nojournal_sops;
3381 sb->s_export_op = &ext4_export_ops;
3382 sb->s_xattr = ext4_xattr_handlers;
3383 #ifdef CONFIG_QUOTA
3384 sb->s_qcop = &ext4_qctl_operations;
3385 sb->dq_op = &ext4_quota_operations;
3386 #endif
3387 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3388 mutex_init(&sbi->s_orphan_lock);
3389 mutex_init(&sbi->s_resize_lock);
3390
3391 sb->s_root = NULL;
3392
3393 needs_recovery = (es->s_last_orphan != 0 ||
3394 EXT4_HAS_INCOMPAT_FEATURE(sb,
3395 EXT4_FEATURE_INCOMPAT_RECOVER));
3396
3397 /*
3398 * The first inode we look at is the journal inode. Don't try
3399 * root first: it may be modified in the journal!
3400 */
3401 if (!test_opt(sb, NOLOAD) &&
3402 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3403 if (ext4_load_journal(sb, es, journal_devnum))
3404 goto failed_mount3;
3405 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3406 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3407 ext4_msg(sb, KERN_ERR, "required journal recovery "
3408 "suppressed and not mounted read-only");
3409 goto failed_mount_wq;
3410 } else {
3411 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
3412 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3413 sbi->s_journal = NULL;
3414 needs_recovery = 0;
3415 goto no_journal;
3416 }
3417
3418 if (ext4_blocks_count(es) > 0xffffffffULL &&
3419 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3420 JBD2_FEATURE_INCOMPAT_64BIT)) {
3421 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3422 goto failed_mount_wq;
3423 }
3424
3425 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3426 jbd2_journal_set_features(sbi->s_journal,
3427 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3428 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3429 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3430 jbd2_journal_set_features(sbi->s_journal,
3431 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3432 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3433 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3434 } else {
3435 jbd2_journal_clear_features(sbi->s_journal,
3436 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3437 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3438 }
3439
3440 /* We have now updated the journal if required, so we can
3441 * validate the data journaling mode. */
3442 switch (test_opt(sb, DATA_FLAGS)) {
3443 case 0:
3444 /* No mode set, assume a default based on the journal
3445 * capabilities: ORDERED_DATA if the journal can
3446 * cope, else JOURNAL_DATA
3447 */
3448 if (jbd2_journal_check_available_features
3449 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3450 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3451 else
3452 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3453 break;
3454
3455 case EXT4_MOUNT_ORDERED_DATA:
3456 case EXT4_MOUNT_WRITEBACK_DATA:
3457 if (!jbd2_journal_check_available_features
3458 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3459 ext4_msg(sb, KERN_ERR, "Journal does not support "
3460 "requested data journaling mode");
3461 goto failed_mount_wq;
3462 }
3463 default:
3464 break;
3465 }
3466 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3467
3468 /*
3469 * The journal may have updated the bg summary counts, so we
3470 * need to update the global counters.
3471 */
3472 percpu_counter_set(&sbi->s_freeblocks_counter,
3473 ext4_count_free_blocks(sb));
3474 percpu_counter_set(&sbi->s_freeinodes_counter,
3475 ext4_count_free_inodes(sb));
3476 percpu_counter_set(&sbi->s_dirs_counter,
3477 ext4_count_dirs(sb));
3478 percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
3479
3480 no_journal:
3481 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
3482 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3483 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3484 goto failed_mount_wq;
3485 }
3486
3487 /*
3488 * The jbd2_journal_load will have done any necessary log recovery,
3489 * so we can safely mount the rest of the filesystem now.
3490 */
3491
3492 root = ext4_iget(sb, EXT4_ROOT_INO);
3493 if (IS_ERR(root)) {
3494 ext4_msg(sb, KERN_ERR, "get root inode failed");
3495 ret = PTR_ERR(root);
3496 goto failed_mount4;
3497 }
3498 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3499 iput(root);
3500 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3501 goto failed_mount4;
3502 }
3503 sb->s_root = d_alloc_root(root);
3504 if (!sb->s_root) {
3505 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3506 iput(root);
3507 ret = -ENOMEM;
3508 goto failed_mount4;
3509 }
3510
3511 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3512
3513 /* determine the minimum size of new large inodes, if present */
3514 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3515 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3516 EXT4_GOOD_OLD_INODE_SIZE;
3517 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3518 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3519 if (sbi->s_want_extra_isize <
3520 le16_to_cpu(es->s_want_extra_isize))
3521 sbi->s_want_extra_isize =
3522 le16_to_cpu(es->s_want_extra_isize);
3523 if (sbi->s_want_extra_isize <
3524 le16_to_cpu(es->s_min_extra_isize))
3525 sbi->s_want_extra_isize =
3526 le16_to_cpu(es->s_min_extra_isize);
3527 }
3528 }
3529 /* Check if enough inode space is available */
3530 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3531 sbi->s_inode_size) {
3532 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3533 EXT4_GOOD_OLD_INODE_SIZE;
3534 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3535 "available");
3536 }
3537
3538 if (test_opt(sb, DELALLOC) &&
3539 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
3540 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3541 "requested data journaling mode");
3542 clear_opt(sbi->s_mount_opt, DELALLOC);
3543 }
3544 if (test_opt(sb, DIOREAD_NOLOCK)) {
3545 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3546 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3547 "option - requested data journaling mode");
3548 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3549 }
3550 if (sb->s_blocksize < PAGE_SIZE) {
3551 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3552 "option - block size is too small");
3553 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3554 }
3555 }
3556
3557 err = ext4_setup_system_zone(sb);
3558 if (err) {
3559 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3560 "zone (%d)", err);
3561 goto failed_mount4;
3562 }
3563
3564 ext4_ext_init(sb);
3565 err = ext4_mb_init(sb, needs_recovery);
3566 if (err) {
3567 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3568 err);
3569 goto failed_mount4;
3570 }
3571
3572 err = ext4_register_li_request(sb, first_not_zeroed);
3573 if (err)
3574 goto failed_mount4;
3575
3576 sbi->s_kobj.kset = ext4_kset;
3577 init_completion(&sbi->s_kobj_unregister);
3578 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3579 "%s", sb->s_id);
3580 if (err) {
3581 ext4_mb_release(sb);
3582 ext4_ext_release(sb);
3583 goto failed_mount4;
3584 };
3585
3586 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3587 ext4_orphan_cleanup(sb, es);
3588 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3589 if (needs_recovery) {
3590 ext4_msg(sb, KERN_INFO, "recovery complete");
3591 ext4_mark_recovery_complete(sb, es);
3592 }
3593 if (EXT4_SB(sb)->s_journal) {
3594 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3595 descr = " journalled data mode";
3596 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3597 descr = " ordered data mode";
3598 else
3599 descr = " writeback data mode";
3600 } else
3601 descr = "out journal";
3602
3603 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3604 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3605 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3606
3607 init_timer(&sbi->s_err_report);
3608 sbi->s_err_report.function = print_daily_error_info;
3609 sbi->s_err_report.data = (unsigned long) sb;
3610 if (es->s_error_count)
3611 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3612
3613 kfree(orig_data);
3614 return 0;
3615
3616 cantfind_ext4:
3617 if (!silent)
3618 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3619 goto failed_mount;
3620
3621 failed_mount4:
3622 ext4_msg(sb, KERN_ERR, "mount failed");
3623 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3624 failed_mount_wq:
3625 ext4_release_system_zone(sb);
3626 if (sbi->s_journal) {
3627 jbd2_journal_destroy(sbi->s_journal);
3628 sbi->s_journal = NULL;
3629 }
3630 failed_mount3:
3631 if (sbi->s_flex_groups) {
3632 if (is_vmalloc_addr(sbi->s_flex_groups))
3633 vfree(sbi->s_flex_groups);
3634 else
3635 kfree(sbi->s_flex_groups);
3636 }
3637 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3638 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3639 percpu_counter_destroy(&sbi->s_dirs_counter);
3640 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
3641 failed_mount2:
3642 for (i = 0; i < db_count; i++)
3643 brelse(sbi->s_group_desc[i]);
3644 kfree(sbi->s_group_desc);
3645 failed_mount:
3646 if (sbi->s_proc) {
3647 remove_proc_entry(sb->s_id, ext4_proc_root);
3648 }
3649 #ifdef CONFIG_QUOTA
3650 for (i = 0; i < MAXQUOTAS; i++)
3651 kfree(sbi->s_qf_names[i]);
3652 #endif
3653 ext4_blkdev_remove(sbi);
3654 brelse(bh);
3655 out_fail:
3656 sb->s_fs_info = NULL;
3657 kfree(sbi->s_blockgroup_lock);
3658 kfree(sbi);
3659 out_free_orig:
3660 kfree(orig_data);
3661 return ret;
3662 }
3663
3664 /*
3665 * Setup any per-fs journal parameters now. We'll do this both on
3666 * initial mount, once the journal has been initialised but before we've
3667 * done any recovery; and again on any subsequent remount.
3668 */
3669 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3670 {
3671 struct ext4_sb_info *sbi = EXT4_SB(sb);
3672
3673 journal->j_commit_interval = sbi->s_commit_interval;
3674 journal->j_min_batch_time = sbi->s_min_batch_time;
3675 journal->j_max_batch_time = sbi->s_max_batch_time;
3676
3677 write_lock(&journal->j_state_lock);
3678 if (test_opt(sb, BARRIER))
3679 journal->j_flags |= JBD2_BARRIER;
3680 else
3681 journal->j_flags &= ~JBD2_BARRIER;
3682 if (test_opt(sb, DATA_ERR_ABORT))
3683 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3684 else
3685 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3686 write_unlock(&journal->j_state_lock);
3687 }
3688
3689 static journal_t *ext4_get_journal(struct super_block *sb,
3690 unsigned int journal_inum)
3691 {
3692 struct inode *journal_inode;
3693 journal_t *journal;
3694
3695 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3696
3697 /* First, test for the existence of a valid inode on disk. Bad
3698 * things happen if we iget() an unused inode, as the subsequent
3699 * iput() will try to delete it. */
3700
3701 journal_inode = ext4_iget(sb, journal_inum);
3702 if (IS_ERR(journal_inode)) {
3703 ext4_msg(sb, KERN_ERR, "no journal found");
3704 return NULL;
3705 }
3706 if (!journal_inode->i_nlink) {
3707 make_bad_inode(journal_inode);
3708 iput(journal_inode);
3709 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3710 return NULL;
3711 }
3712
3713 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3714 journal_inode, journal_inode->i_size);
3715 if (!S_ISREG(journal_inode->i_mode)) {
3716 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3717 iput(journal_inode);
3718 return NULL;
3719 }
3720
3721 journal = jbd2_journal_init_inode(journal_inode);
3722 if (!journal) {
3723 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3724 iput(journal_inode);
3725 return NULL;
3726 }
3727 journal->j_private = sb;
3728 ext4_init_journal_params(sb, journal);
3729 return journal;
3730 }
3731
3732 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3733 dev_t j_dev)
3734 {
3735 struct buffer_head *bh;
3736 journal_t *journal;
3737 ext4_fsblk_t start;
3738 ext4_fsblk_t len;
3739 int hblock, blocksize;
3740 ext4_fsblk_t sb_block;
3741 unsigned long offset;
3742 struct ext4_super_block *es;
3743 struct block_device *bdev;
3744
3745 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3746
3747 bdev = ext4_blkdev_get(j_dev, sb);
3748 if (bdev == NULL)
3749 return NULL;
3750
3751 if (bd_claim(bdev, sb)) {
3752 ext4_msg(sb, KERN_ERR,
3753 "failed to claim external journal device");
3754 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3755 return NULL;
3756 }
3757
3758 blocksize = sb->s_blocksize;
3759 hblock = bdev_logical_block_size(bdev);
3760 if (blocksize < hblock) {
3761 ext4_msg(sb, KERN_ERR,
3762 "blocksize too small for journal device");
3763 goto out_bdev;
3764 }
3765
3766 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3767 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3768 set_blocksize(bdev, blocksize);
3769 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3770 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3771 "external journal");
3772 goto out_bdev;
3773 }
3774
3775 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3776 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3777 !(le32_to_cpu(es->s_feature_incompat) &
3778 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3779 ext4_msg(sb, KERN_ERR, "external journal has "
3780 "bad superblock");
3781 brelse(bh);
3782 goto out_bdev;
3783 }
3784
3785 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3786 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3787 brelse(bh);
3788 goto out_bdev;
3789 }
3790
3791 len = ext4_blocks_count(es);
3792 start = sb_block + 1;
3793 brelse(bh); /* we're done with the superblock */
3794
3795 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3796 start, len, blocksize);
3797 if (!journal) {
3798 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3799 goto out_bdev;
3800 }
3801 journal->j_private = sb;
3802 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3803 wait_on_buffer(journal->j_sb_buffer);
3804 if (!buffer_uptodate(journal->j_sb_buffer)) {
3805 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3806 goto out_journal;
3807 }
3808 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3809 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3810 "user (unsupported) - %d",
3811 be32_to_cpu(journal->j_superblock->s_nr_users));
3812 goto out_journal;
3813 }
3814 EXT4_SB(sb)->journal_bdev = bdev;
3815 ext4_init_journal_params(sb, journal);
3816 return journal;
3817
3818 out_journal:
3819 jbd2_journal_destroy(journal);
3820 out_bdev:
3821 ext4_blkdev_put(bdev);
3822 return NULL;
3823 }
3824
3825 static int ext4_load_journal(struct super_block *sb,
3826 struct ext4_super_block *es,
3827 unsigned long journal_devnum)
3828 {
3829 journal_t *journal;
3830 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3831 dev_t journal_dev;
3832 int err = 0;
3833 int really_read_only;
3834
3835 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3836
3837 if (journal_devnum &&
3838 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3839 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3840 "numbers have changed");
3841 journal_dev = new_decode_dev(journal_devnum);
3842 } else
3843 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3844
3845 really_read_only = bdev_read_only(sb->s_bdev);
3846
3847 /*
3848 * Are we loading a blank journal or performing recovery after a
3849 * crash? For recovery, we need to check in advance whether we
3850 * can get read-write access to the device.
3851 */
3852 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3853 if (sb->s_flags & MS_RDONLY) {
3854 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3855 "required on readonly filesystem");
3856 if (really_read_only) {
3857 ext4_msg(sb, KERN_ERR, "write access "
3858 "unavailable, cannot proceed");
3859 return -EROFS;
3860 }
3861 ext4_msg(sb, KERN_INFO, "write access will "
3862 "be enabled during recovery");
3863 }
3864 }
3865
3866 if (journal_inum && journal_dev) {
3867 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3868 "and inode journals!");
3869 return -EINVAL;
3870 }
3871
3872 if (journal_inum) {
3873 if (!(journal = ext4_get_journal(sb, journal_inum)))
3874 return -EINVAL;
3875 } else {
3876 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3877 return -EINVAL;
3878 }
3879
3880 if (!(journal->j_flags & JBD2_BARRIER))
3881 ext4_msg(sb, KERN_INFO, "barriers disabled");
3882
3883 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3884 err = jbd2_journal_update_format(journal);
3885 if (err) {
3886 ext4_msg(sb, KERN_ERR, "error updating journal");
3887 jbd2_journal_destroy(journal);
3888 return err;
3889 }
3890 }
3891
3892 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3893 err = jbd2_journal_wipe(journal, !really_read_only);
3894 if (!err) {
3895 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3896 if (save)
3897 memcpy(save, ((char *) es) +
3898 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
3899 err = jbd2_journal_load(journal);
3900 if (save)
3901 memcpy(((char *) es) + EXT4_S_ERR_START,
3902 save, EXT4_S_ERR_LEN);
3903 kfree(save);
3904 }
3905
3906 if (err) {
3907 ext4_msg(sb, KERN_ERR, "error loading journal");
3908 jbd2_journal_destroy(journal);
3909 return err;
3910 }
3911
3912 EXT4_SB(sb)->s_journal = journal;
3913 ext4_clear_journal_err(sb, es);
3914
3915 if (!really_read_only && journal_devnum &&
3916 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3917 es->s_journal_dev = cpu_to_le32(journal_devnum);
3918
3919 /* Make sure we flush the recovery flag to disk. */
3920 ext4_commit_super(sb, 1);
3921 }
3922
3923 return 0;
3924 }
3925
3926 static int ext4_commit_super(struct super_block *sb, int sync)
3927 {
3928 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3929 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3930 int error = 0;
3931
3932 if (!sbh)
3933 return error;
3934 if (buffer_write_io_error(sbh)) {
3935 /*
3936 * Oh, dear. A previous attempt to write the
3937 * superblock failed. This could happen because the
3938 * USB device was yanked out. Or it could happen to
3939 * be a transient write error and maybe the block will
3940 * be remapped. Nothing we can do but to retry the
3941 * write and hope for the best.
3942 */
3943 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3944 "superblock detected");
3945 clear_buffer_write_io_error(sbh);
3946 set_buffer_uptodate(sbh);
3947 }
3948 /*
3949 * If the file system is mounted read-only, don't update the
3950 * superblock write time. This avoids updating the superblock
3951 * write time when we are mounting the root file system
3952 * read/only but we need to replay the journal; at that point,
3953 * for people who are east of GMT and who make their clock
3954 * tick in localtime for Windows bug-for-bug compatibility,
3955 * the clock is set in the future, and this will cause e2fsck
3956 * to complain and force a full file system check.
3957 */
3958 if (!(sb->s_flags & MS_RDONLY))
3959 es->s_wtime = cpu_to_le32(get_seconds());
3960 if (sb->s_bdev->bd_part)
3961 es->s_kbytes_written =
3962 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3963 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3964 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3965 else
3966 es->s_kbytes_written =
3967 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
3968 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3969 &EXT4_SB(sb)->s_freeblocks_counter));
3970 es->s_free_inodes_count =
3971 cpu_to_le32(percpu_counter_sum_positive(
3972 &EXT4_SB(sb)->s_freeinodes_counter));
3973 sb->s_dirt = 0;
3974 BUFFER_TRACE(sbh, "marking dirty");
3975 mark_buffer_dirty(sbh);
3976 if (sync) {
3977 error = sync_dirty_buffer(sbh);
3978 if (error)
3979 return error;
3980
3981 error = buffer_write_io_error(sbh);
3982 if (error) {
3983 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3984 "superblock");
3985 clear_buffer_write_io_error(sbh);
3986 set_buffer_uptodate(sbh);
3987 }
3988 }
3989 return error;
3990 }
3991
3992 /*
3993 * Have we just finished recovery? If so, and if we are mounting (or
3994 * remounting) the filesystem readonly, then we will end up with a
3995 * consistent fs on disk. Record that fact.
3996 */
3997 static void ext4_mark_recovery_complete(struct super_block *sb,
3998 struct ext4_super_block *es)
3999 {
4000 journal_t *journal = EXT4_SB(sb)->s_journal;
4001
4002 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4003 BUG_ON(journal != NULL);
4004 return;
4005 }
4006 jbd2_journal_lock_updates(journal);
4007 if (jbd2_journal_flush(journal) < 0)
4008 goto out;
4009
4010 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4011 sb->s_flags & MS_RDONLY) {
4012 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4013 ext4_commit_super(sb, 1);
4014 }
4015
4016 out:
4017 jbd2_journal_unlock_updates(journal);
4018 }
4019
4020 /*
4021 * If we are mounting (or read-write remounting) a filesystem whose journal
4022 * has recorded an error from a previous lifetime, move that error to the
4023 * main filesystem now.
4024 */
4025 static void ext4_clear_journal_err(struct super_block *sb,
4026 struct ext4_super_block *es)
4027 {
4028 journal_t *journal;
4029 int j_errno;
4030 const char *errstr;
4031
4032 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4033
4034 journal = EXT4_SB(sb)->s_journal;
4035
4036 /*
4037 * Now check for any error status which may have been recorded in the
4038 * journal by a prior ext4_error() or ext4_abort()
4039 */
4040
4041 j_errno = jbd2_journal_errno(journal);
4042 if (j_errno) {
4043 char nbuf[16];
4044
4045 errstr = ext4_decode_error(sb, j_errno, nbuf);
4046 ext4_warning(sb, "Filesystem error recorded "
4047 "from previous mount: %s", errstr);
4048 ext4_warning(sb, "Marking fs in need of filesystem check.");
4049
4050 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4051 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4052 ext4_commit_super(sb, 1);
4053
4054 jbd2_journal_clear_err(journal);
4055 }
4056 }
4057
4058 /*
4059 * Force the running and committing transactions to commit,
4060 * and wait on the commit.
4061 */
4062 int ext4_force_commit(struct super_block *sb)
4063 {
4064 journal_t *journal;
4065 int ret = 0;
4066
4067 if (sb->s_flags & MS_RDONLY)
4068 return 0;
4069
4070 journal = EXT4_SB(sb)->s_journal;
4071 if (journal) {
4072 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4073 ret = ext4_journal_force_commit(journal);
4074 }
4075
4076 return ret;
4077 }
4078
4079 static void ext4_write_super(struct super_block *sb)
4080 {
4081 lock_super(sb);
4082 ext4_commit_super(sb, 1);
4083 unlock_super(sb);
4084 }
4085
4086 static int ext4_sync_fs(struct super_block *sb, int wait)
4087 {
4088 int ret = 0;
4089 tid_t target;
4090 struct ext4_sb_info *sbi = EXT4_SB(sb);
4091
4092 trace_ext4_sync_fs(sb, wait);
4093 flush_workqueue(sbi->dio_unwritten_wq);
4094 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4095 if (wait)
4096 jbd2_log_wait_commit(sbi->s_journal, target);
4097 }
4098 return ret;
4099 }
4100
4101 /*
4102 * LVM calls this function before a (read-only) snapshot is created. This
4103 * gives us a chance to flush the journal completely and mark the fs clean.
4104 */
4105 static int ext4_freeze(struct super_block *sb)
4106 {
4107 int error = 0;
4108 journal_t *journal;
4109
4110 if (sb->s_flags & MS_RDONLY)
4111 return 0;
4112
4113 journal = EXT4_SB(sb)->s_journal;
4114
4115 /* Now we set up the journal barrier. */
4116 jbd2_journal_lock_updates(journal);
4117
4118 /*
4119 * Don't clear the needs_recovery flag if we failed to flush
4120 * the journal.
4121 */
4122 error = jbd2_journal_flush(journal);
4123 if (error < 0)
4124 goto out;
4125
4126 /* Journal blocked and flushed, clear needs_recovery flag. */
4127 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4128 error = ext4_commit_super(sb, 1);
4129 out:
4130 /* we rely on s_frozen to stop further updates */
4131 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4132 return error;
4133 }
4134
4135 /*
4136 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4137 * flag here, even though the filesystem is not technically dirty yet.
4138 */
4139 static int ext4_unfreeze(struct super_block *sb)
4140 {
4141 if (sb->s_flags & MS_RDONLY)
4142 return 0;
4143
4144 lock_super(sb);
4145 /* Reset the needs_recovery flag before the fs is unlocked. */
4146 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4147 ext4_commit_super(sb, 1);
4148 unlock_super(sb);
4149 return 0;
4150 }
4151
4152 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4153 {
4154 struct ext4_super_block *es;
4155 struct ext4_sb_info *sbi = EXT4_SB(sb);
4156 ext4_fsblk_t n_blocks_count = 0;
4157 unsigned long old_sb_flags;
4158 struct ext4_mount_options old_opts;
4159 int enable_quota = 0;
4160 ext4_group_t g;
4161 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4162 int err;
4163 #ifdef CONFIG_QUOTA
4164 int i;
4165 #endif
4166 char *orig_data = kstrdup(data, GFP_KERNEL);
4167
4168 /* Store the original options */
4169 lock_super(sb);
4170 old_sb_flags = sb->s_flags;
4171 old_opts.s_mount_opt = sbi->s_mount_opt;
4172 old_opts.s_resuid = sbi->s_resuid;
4173 old_opts.s_resgid = sbi->s_resgid;
4174 old_opts.s_commit_interval = sbi->s_commit_interval;
4175 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4176 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4177 #ifdef CONFIG_QUOTA
4178 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4179 for (i = 0; i < MAXQUOTAS; i++)
4180 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4181 #endif
4182 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4183 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4184
4185 /*
4186 * Allow the "check" option to be passed as a remount option.
4187 */
4188 if (!parse_options(data, sb, NULL, &journal_ioprio,
4189 &n_blocks_count, 1)) {
4190 err = -EINVAL;
4191 goto restore_opts;
4192 }
4193
4194 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4195 ext4_abort(sb, "Abort forced by user");
4196
4197 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4198 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4199
4200 es = sbi->s_es;
4201
4202 if (sbi->s_journal) {
4203 ext4_init_journal_params(sb, sbi->s_journal);
4204 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4205 }
4206
4207 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
4208 n_blocks_count > ext4_blocks_count(es)) {
4209 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4210 err = -EROFS;
4211 goto restore_opts;
4212 }
4213
4214 if (*flags & MS_RDONLY) {
4215 err = dquot_suspend(sb, -1);
4216 if (err < 0)
4217 goto restore_opts;
4218
4219 /*
4220 * First of all, the unconditional stuff we have to do
4221 * to disable replay of the journal when we next remount
4222 */
4223 sb->s_flags |= MS_RDONLY;
4224
4225 /*
4226 * OK, test if we are remounting a valid rw partition
4227 * readonly, and if so set the rdonly flag and then
4228 * mark the partition as valid again.
4229 */
4230 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4231 (sbi->s_mount_state & EXT4_VALID_FS))
4232 es->s_state = cpu_to_le16(sbi->s_mount_state);
4233
4234 if (sbi->s_journal)
4235 ext4_mark_recovery_complete(sb, es);
4236 } else {
4237 /* Make sure we can mount this feature set readwrite */
4238 if (!ext4_feature_set_ok(sb, 0)) {
4239 err = -EROFS;
4240 goto restore_opts;
4241 }
4242 /*
4243 * Make sure the group descriptor checksums
4244 * are sane. If they aren't, refuse to remount r/w.
4245 */
4246 for (g = 0; g < sbi->s_groups_count; g++) {
4247 struct ext4_group_desc *gdp =
4248 ext4_get_group_desc(sb, g, NULL);
4249
4250 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4251 ext4_msg(sb, KERN_ERR,
4252 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4253 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4254 le16_to_cpu(gdp->bg_checksum));
4255 err = -EINVAL;
4256 goto restore_opts;
4257 }
4258 }
4259
4260 /*
4261 * If we have an unprocessed orphan list hanging
4262 * around from a previously readonly bdev mount,
4263 * require a full umount/remount for now.
4264 */
4265 if (es->s_last_orphan) {
4266 ext4_msg(sb, KERN_WARNING, "Couldn't "
4267 "remount RDWR because of unprocessed "
4268 "orphan inode list. Please "
4269 "umount/remount instead");
4270 err = -EINVAL;
4271 goto restore_opts;
4272 }
4273
4274 /*
4275 * Mounting a RDONLY partition read-write, so reread
4276 * and store the current valid flag. (It may have
4277 * been changed by e2fsck since we originally mounted
4278 * the partition.)
4279 */
4280 if (sbi->s_journal)
4281 ext4_clear_journal_err(sb, es);
4282 sbi->s_mount_state = le16_to_cpu(es->s_state);
4283 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
4284 goto restore_opts;
4285 if (!ext4_setup_super(sb, es, 0))
4286 sb->s_flags &= ~MS_RDONLY;
4287 enable_quota = 1;
4288 }
4289 }
4290
4291 /*
4292 * Reinitialize lazy itable initialization thread based on
4293 * current settings
4294 */
4295 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4296 ext4_unregister_li_request(sb);
4297 else {
4298 ext4_group_t first_not_zeroed;
4299 first_not_zeroed = ext4_has_uninit_itable(sb);
4300 ext4_register_li_request(sb, first_not_zeroed);
4301 }
4302
4303 ext4_setup_system_zone(sb);
4304 if (sbi->s_journal == NULL)
4305 ext4_commit_super(sb, 1);
4306
4307 #ifdef CONFIG_QUOTA
4308 /* Release old quota file names */
4309 for (i = 0; i < MAXQUOTAS; i++)
4310 if (old_opts.s_qf_names[i] &&
4311 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4312 kfree(old_opts.s_qf_names[i]);
4313 #endif
4314 unlock_super(sb);
4315 if (enable_quota)
4316 dquot_resume(sb, -1);
4317
4318 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4319 kfree(orig_data);
4320 return 0;
4321
4322 restore_opts:
4323 sb->s_flags = old_sb_flags;
4324 sbi->s_mount_opt = old_opts.s_mount_opt;
4325 sbi->s_resuid = old_opts.s_resuid;
4326 sbi->s_resgid = old_opts.s_resgid;
4327 sbi->s_commit_interval = old_opts.s_commit_interval;
4328 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4329 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4330 #ifdef CONFIG_QUOTA
4331 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4332 for (i = 0; i < MAXQUOTAS; i++) {
4333 if (sbi->s_qf_names[i] &&
4334 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4335 kfree(sbi->s_qf_names[i]);
4336 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4337 }
4338 #endif
4339 unlock_super(sb);
4340 kfree(orig_data);
4341 return err;
4342 }
4343
4344 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4345 {
4346 struct super_block *sb = dentry->d_sb;
4347 struct ext4_sb_info *sbi = EXT4_SB(sb);
4348 struct ext4_super_block *es = sbi->s_es;
4349 u64 fsid;
4350
4351 if (test_opt(sb, MINIX_DF)) {
4352 sbi->s_overhead_last = 0;
4353 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4354 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4355 ext4_fsblk_t overhead = 0;
4356
4357 /*
4358 * Compute the overhead (FS structures). This is constant
4359 * for a given filesystem unless the number of block groups
4360 * changes so we cache the previous value until it does.
4361 */
4362
4363 /*
4364 * All of the blocks before first_data_block are
4365 * overhead
4366 */
4367 overhead = le32_to_cpu(es->s_first_data_block);
4368
4369 /*
4370 * Add the overhead attributed to the superblock and
4371 * block group descriptors. If the sparse superblocks
4372 * feature is turned on, then not all groups have this.
4373 */
4374 for (i = 0; i < ngroups; i++) {
4375 overhead += ext4_bg_has_super(sb, i) +
4376 ext4_bg_num_gdb(sb, i);
4377 cond_resched();
4378 }
4379
4380 /*
4381 * Every block group has an inode bitmap, a block
4382 * bitmap, and an inode table.
4383 */
4384 overhead += ngroups * (2 + sbi->s_itb_per_group);
4385 sbi->s_overhead_last = overhead;
4386 smp_wmb();
4387 sbi->s_blocks_last = ext4_blocks_count(es);
4388 }
4389
4390 buf->f_type = EXT4_SUPER_MAGIC;
4391 buf->f_bsize = sb->s_blocksize;
4392 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
4393 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
4394 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
4395 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4396 if (buf->f_bfree < ext4_r_blocks_count(es))
4397 buf->f_bavail = 0;
4398 buf->f_files = le32_to_cpu(es->s_inodes_count);
4399 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4400 buf->f_namelen = EXT4_NAME_LEN;
4401 fsid = le64_to_cpup((void *)es->s_uuid) ^
4402 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4403 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4404 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4405
4406 return 0;
4407 }
4408
4409 /* Helper function for writing quotas on sync - we need to start transaction
4410 * before quota file is locked for write. Otherwise the are possible deadlocks:
4411 * Process 1 Process 2
4412 * ext4_create() quota_sync()
4413 * jbd2_journal_start() write_dquot()
4414 * dquot_initialize() down(dqio_mutex)
4415 * down(dqio_mutex) jbd2_journal_start()
4416 *
4417 */
4418
4419 #ifdef CONFIG_QUOTA
4420
4421 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4422 {
4423 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4424 }
4425
4426 static int ext4_write_dquot(struct dquot *dquot)
4427 {
4428 int ret, err;
4429 handle_t *handle;
4430 struct inode *inode;
4431
4432 inode = dquot_to_inode(dquot);
4433 handle = ext4_journal_start(inode,
4434 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4435 if (IS_ERR(handle))
4436 return PTR_ERR(handle);
4437 ret = dquot_commit(dquot);
4438 err = ext4_journal_stop(handle);
4439 if (!ret)
4440 ret = err;
4441 return ret;
4442 }
4443
4444 static int ext4_acquire_dquot(struct dquot *dquot)
4445 {
4446 int ret, err;
4447 handle_t *handle;
4448
4449 handle = ext4_journal_start(dquot_to_inode(dquot),
4450 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4451 if (IS_ERR(handle))
4452 return PTR_ERR(handle);
4453 ret = dquot_acquire(dquot);
4454 err = ext4_journal_stop(handle);
4455 if (!ret)
4456 ret = err;
4457 return ret;
4458 }
4459
4460 static int ext4_release_dquot(struct dquot *dquot)
4461 {
4462 int ret, err;
4463 handle_t *handle;
4464
4465 handle = ext4_journal_start(dquot_to_inode(dquot),
4466 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4467 if (IS_ERR(handle)) {
4468 /* Release dquot anyway to avoid endless cycle in dqput() */
4469 dquot_release(dquot);
4470 return PTR_ERR(handle);
4471 }
4472 ret = dquot_release(dquot);
4473 err = ext4_journal_stop(handle);
4474 if (!ret)
4475 ret = err;
4476 return ret;
4477 }
4478
4479 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4480 {
4481 /* Are we journaling quotas? */
4482 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4483 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4484 dquot_mark_dquot_dirty(dquot);
4485 return ext4_write_dquot(dquot);
4486 } else {
4487 return dquot_mark_dquot_dirty(dquot);
4488 }
4489 }
4490
4491 static int ext4_write_info(struct super_block *sb, int type)
4492 {
4493 int ret, err;
4494 handle_t *handle;
4495
4496 /* Data block + inode block */
4497 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4498 if (IS_ERR(handle))
4499 return PTR_ERR(handle);
4500 ret = dquot_commit_info(sb, type);
4501 err = ext4_journal_stop(handle);
4502 if (!ret)
4503 ret = err;
4504 return ret;
4505 }
4506
4507 /*
4508 * Turn on quotas during mount time - we need to find
4509 * the quota file and such...
4510 */
4511 static int ext4_quota_on_mount(struct super_block *sb, int type)
4512 {
4513 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4514 EXT4_SB(sb)->s_jquota_fmt, type);
4515 }
4516
4517 /*
4518 * Standard function to be called on quota_on
4519 */
4520 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4521 char *name)
4522 {
4523 int err;
4524 struct path path;
4525
4526 if (!test_opt(sb, QUOTA))
4527 return -EINVAL;
4528
4529 err = kern_path(name, LOOKUP_FOLLOW, &path);
4530 if (err)
4531 return err;
4532
4533 /* Quotafile not on the same filesystem? */
4534 if (path.mnt->mnt_sb != sb) {
4535 path_put(&path);
4536 return -EXDEV;
4537 }
4538 /* Journaling quota? */
4539 if (EXT4_SB(sb)->s_qf_names[type]) {
4540 /* Quotafile not in fs root? */
4541 if (path.dentry->d_parent != sb->s_root)
4542 ext4_msg(sb, KERN_WARNING,
4543 "Quota file not on filesystem root. "
4544 "Journaled quota will not work");
4545 }
4546
4547 /*
4548 * When we journal data on quota file, we have to flush journal to see
4549 * all updates to the file when we bypass pagecache...
4550 */
4551 if (EXT4_SB(sb)->s_journal &&
4552 ext4_should_journal_data(path.dentry->d_inode)) {
4553 /*
4554 * We don't need to lock updates but journal_flush() could
4555 * otherwise be livelocked...
4556 */
4557 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4558 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4559 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4560 if (err) {
4561 path_put(&path);
4562 return err;
4563 }
4564 }
4565
4566 err = dquot_quota_on_path(sb, type, format_id, &path);
4567 path_put(&path);
4568 return err;
4569 }
4570
4571 static int ext4_quota_off(struct super_block *sb, int type)
4572 {
4573 /* Force all delayed allocation blocks to be allocated */
4574 if (test_opt(sb, DELALLOC)) {
4575 down_read(&sb->s_umount);
4576 sync_filesystem(sb);
4577 up_read(&sb->s_umount);
4578 }
4579
4580 return dquot_quota_off(sb, type);
4581 }
4582
4583 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4584 * acquiring the locks... As quota files are never truncated and quota code
4585 * itself serializes the operations (and noone else should touch the files)
4586 * we don't have to be afraid of races */
4587 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4588 size_t len, loff_t off)
4589 {
4590 struct inode *inode = sb_dqopt(sb)->files[type];
4591 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4592 int err = 0;
4593 int offset = off & (sb->s_blocksize - 1);
4594 int tocopy;
4595 size_t toread;
4596 struct buffer_head *bh;
4597 loff_t i_size = i_size_read(inode);
4598
4599 if (off > i_size)
4600 return 0;
4601 if (off+len > i_size)
4602 len = i_size-off;
4603 toread = len;
4604 while (toread > 0) {
4605 tocopy = sb->s_blocksize - offset < toread ?
4606 sb->s_blocksize - offset : toread;
4607 bh = ext4_bread(NULL, inode, blk, 0, &err);
4608 if (err)
4609 return err;
4610 if (!bh) /* A hole? */
4611 memset(data, 0, tocopy);
4612 else
4613 memcpy(data, bh->b_data+offset, tocopy);
4614 brelse(bh);
4615 offset = 0;
4616 toread -= tocopy;
4617 data += tocopy;
4618 blk++;
4619 }
4620 return len;
4621 }
4622
4623 /* Write to quotafile (we know the transaction is already started and has
4624 * enough credits) */
4625 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4626 const char *data, size_t len, loff_t off)
4627 {
4628 struct inode *inode = sb_dqopt(sb)->files[type];
4629 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4630 int err = 0;
4631 int offset = off & (sb->s_blocksize - 1);
4632 struct buffer_head *bh;
4633 handle_t *handle = journal_current_handle();
4634
4635 if (EXT4_SB(sb)->s_journal && !handle) {
4636 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4637 " cancelled because transaction is not started",
4638 (unsigned long long)off, (unsigned long long)len);
4639 return -EIO;
4640 }
4641 /*
4642 * Since we account only one data block in transaction credits,
4643 * then it is impossible to cross a block boundary.
4644 */
4645 if (sb->s_blocksize - offset < len) {
4646 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4647 " cancelled because not block aligned",
4648 (unsigned long long)off, (unsigned long long)len);
4649 return -EIO;
4650 }
4651
4652 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4653 bh = ext4_bread(handle, inode, blk, 1, &err);
4654 if (!bh)
4655 goto out;
4656 err = ext4_journal_get_write_access(handle, bh);
4657 if (err) {
4658 brelse(bh);
4659 goto out;
4660 }
4661 lock_buffer(bh);
4662 memcpy(bh->b_data+offset, data, len);
4663 flush_dcache_page(bh->b_page);
4664 unlock_buffer(bh);
4665 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4666 brelse(bh);
4667 out:
4668 if (err) {
4669 mutex_unlock(&inode->i_mutex);
4670 return err;
4671 }
4672 if (inode->i_size < off + len) {
4673 i_size_write(inode, off + len);
4674 EXT4_I(inode)->i_disksize = inode->i_size;
4675 }
4676 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4677 ext4_mark_inode_dirty(handle, inode);
4678 mutex_unlock(&inode->i_mutex);
4679 return len;
4680 }
4681
4682 #endif
4683
4684 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4685 const char *dev_name, void *data)
4686 {
4687 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
4688 }
4689
4690 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4691 static struct file_system_type ext2_fs_type = {
4692 .owner = THIS_MODULE,
4693 .name = "ext2",
4694 .mount = ext4_mount,
4695 .kill_sb = kill_block_super,
4696 .fs_flags = FS_REQUIRES_DEV,
4697 };
4698
4699 static inline void register_as_ext2(void)
4700 {
4701 int err = register_filesystem(&ext2_fs_type);
4702 if (err)
4703 printk(KERN_WARNING
4704 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4705 }
4706
4707 static inline void unregister_as_ext2(void)
4708 {
4709 unregister_filesystem(&ext2_fs_type);
4710 }
4711 MODULE_ALIAS("ext2");
4712 #else
4713 static inline void register_as_ext2(void) { }
4714 static inline void unregister_as_ext2(void) { }
4715 #endif
4716
4717 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4718 static inline void register_as_ext3(void)
4719 {
4720 int err = register_filesystem(&ext3_fs_type);
4721 if (err)
4722 printk(KERN_WARNING
4723 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4724 }
4725
4726 static inline void unregister_as_ext3(void)
4727 {
4728 unregister_filesystem(&ext3_fs_type);
4729 }
4730 MODULE_ALIAS("ext3");
4731 #else
4732 static inline void register_as_ext3(void) { }
4733 static inline void unregister_as_ext3(void) { }
4734 #endif
4735
4736 static struct file_system_type ext4_fs_type = {
4737 .owner = THIS_MODULE,
4738 .name = "ext4",
4739 .mount = ext4_mount,
4740 .kill_sb = kill_block_super,
4741 .fs_flags = FS_REQUIRES_DEV,
4742 };
4743
4744 int __init ext4_init_feat_adverts(void)
4745 {
4746 struct ext4_features *ef;
4747 int ret = -ENOMEM;
4748
4749 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4750 if (!ef)
4751 goto out;
4752
4753 ef->f_kobj.kset = ext4_kset;
4754 init_completion(&ef->f_kobj_unregister);
4755 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4756 "features");
4757 if (ret) {
4758 kfree(ef);
4759 goto out;
4760 }
4761
4762 ext4_feat = ef;
4763 ret = 0;
4764 out:
4765 return ret;
4766 }
4767
4768 static int __init ext4_init_fs(void)
4769 {
4770 int err;
4771
4772 ext4_check_flag_values();
4773 err = ext4_init_pageio();
4774 if (err)
4775 return err;
4776 err = ext4_init_system_zone();
4777 if (err)
4778 goto out5;
4779 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4780 if (!ext4_kset)
4781 goto out4;
4782 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4783
4784 err = ext4_init_feat_adverts();
4785
4786 err = ext4_init_mballoc();
4787 if (err)
4788 goto out3;
4789
4790 err = ext4_init_xattr();
4791 if (err)
4792 goto out2;
4793 err = init_inodecache();
4794 if (err)
4795 goto out1;
4796 register_as_ext2();
4797 register_as_ext3();
4798 err = register_filesystem(&ext4_fs_type);
4799 if (err)
4800 goto out;
4801
4802 ext4_li_info = NULL;
4803 mutex_init(&ext4_li_mtx);
4804 return 0;
4805 out:
4806 unregister_as_ext2();
4807 unregister_as_ext3();
4808 destroy_inodecache();
4809 out1:
4810 ext4_exit_xattr();
4811 out2:
4812 ext4_exit_mballoc();
4813 out3:
4814 kfree(ext4_feat);
4815 remove_proc_entry("fs/ext4", NULL);
4816 kset_unregister(ext4_kset);
4817 out4:
4818 ext4_exit_system_zone();
4819 out5:
4820 ext4_exit_pageio();
4821 return err;
4822 }
4823
4824 static void __exit ext4_exit_fs(void)
4825 {
4826 ext4_destroy_lazyinit_thread();
4827 unregister_as_ext2();
4828 unregister_as_ext3();
4829 unregister_filesystem(&ext4_fs_type);
4830 destroy_inodecache();
4831 ext4_exit_xattr();
4832 ext4_exit_mballoc();
4833 remove_proc_entry("fs/ext4", NULL);
4834 kset_unregister(ext4_kset);
4835 ext4_exit_system_zone();
4836 ext4_exit_pageio();
4837 }
4838
4839 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4840 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4841 MODULE_LICENSE("GPL");
4842 module_init(ext4_init_fs)
4843 module_exit(ext4_exit_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree