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ALSA: hda - Add support for 92HD65 / 92HD66 family of codecs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / super.c
blob111ed9d3c546620009f2e5e96d587ca677df9efd
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 <linux/cleancache.h>
42 #include <asm/uaccess.h>
43
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
46
47 #include "ext4.h"
48 #include "ext4_jbd2.h"
49 #include "xattr.h"
50 #include "acl.h"
51 #include "mballoc.h"
52
53 #define CREATE_TRACE_POINTS
54 #include <trace/events/ext4.h>
55
56 static struct proc_dir_entry *ext4_proc_root;
57 static struct kset *ext4_kset;
58 static struct ext4_lazy_init *ext4_li_info;
59 static struct mutex ext4_li_mtx;
60 static struct ext4_features *ext4_feat;
61
62 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
63 unsigned long journal_devnum);
64 static int ext4_commit_super(struct super_block *sb, int sync);
65 static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67 static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
69 static int ext4_sync_fs(struct super_block *sb, int wait);
70 static const char *ext4_decode_error(struct super_block *sb, int errno,
71 char nbuf[16]);
72 static int ext4_remount(struct super_block *sb, int *flags, char *data);
73 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
74 static int ext4_unfreeze(struct super_block *sb);
75 static void ext4_write_super(struct super_block *sb);
76 static int ext4_freeze(struct super_block *sb);
77 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
79 static inline int ext2_feature_set_ok(struct super_block *sb);
80 static inline int ext3_feature_set_ok(struct super_block *sb);
81 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
82 static void ext4_destroy_lazyinit_thread(void);
83 static void ext4_unregister_li_request(struct super_block *sb);
84 static void ext4_clear_request_list(void);
85
86 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
87 static struct file_system_type ext2_fs_type = {
88 .owner = THIS_MODULE,
89 .name = "ext2",
90 .mount = ext4_mount,
91 .kill_sb = kill_block_super,
92 .fs_flags = FS_REQUIRES_DEV,
93 };
94 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
95 #else
96 #define IS_EXT2_SB(sb) (0)
97 #endif
98
99
100 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
101 static struct file_system_type ext3_fs_type = {
102 .owner = THIS_MODULE,
103 .name = "ext3",
104 .mount = ext4_mount,
105 .kill_sb = kill_block_super,
106 .fs_flags = FS_REQUIRES_DEV,
107 };
108 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
109 #else
110 #define IS_EXT3_SB(sb) (0)
111 #endif
112
113 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
114 struct ext4_group_desc *bg)
115 {
116 return le32_to_cpu(bg->bg_block_bitmap_lo) |
117 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
118 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
119 }
120
121 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
122 struct ext4_group_desc *bg)
123 {
124 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
125 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
126 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
127 }
128
129 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
130 struct ext4_group_desc *bg)
131 {
132 return le32_to_cpu(bg->bg_inode_table_lo) |
133 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
134 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
135 }
136
137 __u32 ext4_free_blks_count(struct super_block *sb,
138 struct ext4_group_desc *bg)
139 {
140 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
141 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
142 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
143 }
144
145 __u32 ext4_free_inodes_count(struct super_block *sb,
146 struct ext4_group_desc *bg)
147 {
148 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
149 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
150 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
151 }
152
153 __u32 ext4_used_dirs_count(struct super_block *sb,
154 struct ext4_group_desc *bg)
155 {
156 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
157 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
158 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
159 }
160
161 __u32 ext4_itable_unused_count(struct super_block *sb,
162 struct ext4_group_desc *bg)
163 {
164 return le16_to_cpu(bg->bg_itable_unused_lo) |
165 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
166 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
167 }
168
169 void ext4_block_bitmap_set(struct super_block *sb,
170 struct ext4_group_desc *bg, ext4_fsblk_t blk)
171 {
172 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
173 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
174 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
175 }
176
177 void ext4_inode_bitmap_set(struct super_block *sb,
178 struct ext4_group_desc *bg, ext4_fsblk_t blk)
179 {
180 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
181 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
182 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
183 }
184
185 void ext4_inode_table_set(struct super_block *sb,
186 struct ext4_group_desc *bg, ext4_fsblk_t blk)
187 {
188 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
189 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
190 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
191 }
192
193 void ext4_free_blks_set(struct super_block *sb,
194 struct ext4_group_desc *bg, __u32 count)
195 {
196 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
197 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
198 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
199 }
200
201 void ext4_free_inodes_set(struct super_block *sb,
202 struct ext4_group_desc *bg, __u32 count)
203 {
204 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
205 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
206 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
207 }
208
209 void ext4_used_dirs_set(struct super_block *sb,
210 struct ext4_group_desc *bg, __u32 count)
211 {
212 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
213 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
214 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
215 }
216
217 void ext4_itable_unused_set(struct super_block *sb,
218 struct ext4_group_desc *bg, __u32 count)
219 {
220 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
221 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
222 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
223 }
224
225
226 /* Just increment the non-pointer handle value */
227 static handle_t *ext4_get_nojournal(void)
228 {
229 handle_t *handle = current->journal_info;
230 unsigned long ref_cnt = (unsigned long)handle;
231
232 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
233
234 ref_cnt++;
235 handle = (handle_t *)ref_cnt;
236
237 current->journal_info = handle;
238 return handle;
239 }
240
241
242 /* Decrement the non-pointer handle value */
243 static void ext4_put_nojournal(handle_t *handle)
244 {
245 unsigned long ref_cnt = (unsigned long)handle;
246
247 BUG_ON(ref_cnt == 0);
248
249 ref_cnt--;
250 handle = (handle_t *)ref_cnt;
251
252 current->journal_info = handle;
253 }
254
255 /*
256 * Wrappers for jbd2_journal_start/end.
257 *
258 * The only special thing we need to do here is to make sure that all
259 * journal_end calls result in the superblock being marked dirty, so
260 * that sync() will call the filesystem's write_super callback if
261 * appropriate.
262 *
263 * To avoid j_barrier hold in userspace when a user calls freeze(),
264 * ext4 prevents a new handle from being started by s_frozen, which
265 * is in an upper layer.
266 */
267 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
268 {
269 journal_t *journal;
270 handle_t *handle;
271
272 if (sb->s_flags & MS_RDONLY)
273 return ERR_PTR(-EROFS);
274
275 journal = EXT4_SB(sb)->s_journal;
276 handle = ext4_journal_current_handle();
277
278 /*
279 * If a handle has been started, it should be allowed to
280 * finish, otherwise deadlock could happen between freeze
281 * and others(e.g. truncate) due to the restart of the
282 * journal handle if the filesystem is forzen and active
283 * handles are not stopped.
284 */
285 if (!handle)
286 vfs_check_frozen(sb, SB_FREEZE_TRANS);
287
288 if (!journal)
289 return ext4_get_nojournal();
290 /*
291 * Special case here: if the journal has aborted behind our
292 * backs (eg. EIO in the commit thread), then we still need to
293 * take the FS itself readonly cleanly.
294 */
295 if (is_journal_aborted(journal)) {
296 ext4_abort(sb, "Detected aborted journal");
297 return ERR_PTR(-EROFS);
298 }
299 return jbd2_journal_start(journal, nblocks);
300 }
301
302 /*
303 * The only special thing we need to do here is to make sure that all
304 * jbd2_journal_stop calls result in the superblock being marked dirty, so
305 * that sync() will call the filesystem's write_super callback if
306 * appropriate.
307 */
308 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
309 {
310 struct super_block *sb;
311 int err;
312 int rc;
313
314 if (!ext4_handle_valid(handle)) {
315 ext4_put_nojournal(handle);
316 return 0;
317 }
318 sb = handle->h_transaction->t_journal->j_private;
319 err = handle->h_err;
320 rc = jbd2_journal_stop(handle);
321
322 if (!err)
323 err = rc;
324 if (err)
325 __ext4_std_error(sb, where, line, err);
326 return err;
327 }
328
329 void ext4_journal_abort_handle(const char *caller, unsigned int line,
330 const char *err_fn, struct buffer_head *bh,
331 handle_t *handle, int err)
332 {
333 char nbuf[16];
334 const char *errstr = ext4_decode_error(NULL, err, nbuf);
335
336 BUG_ON(!ext4_handle_valid(handle));
337
338 if (bh)
339 BUFFER_TRACE(bh, "abort");
340
341 if (!handle->h_err)
342 handle->h_err = err;
343
344 if (is_handle_aborted(handle))
345 return;
346
347 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
348 caller, line, errstr, err_fn);
349
350 jbd2_journal_abort_handle(handle);
351 }
352
353 static void __save_error_info(struct super_block *sb, const char *func,
354 unsigned int line)
355 {
356 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
357
358 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
359 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
360 es->s_last_error_time = cpu_to_le32(get_seconds());
361 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
362 es->s_last_error_line = cpu_to_le32(line);
363 if (!es->s_first_error_time) {
364 es->s_first_error_time = es->s_last_error_time;
365 strncpy(es->s_first_error_func, func,
366 sizeof(es->s_first_error_func));
367 es->s_first_error_line = cpu_to_le32(line);
368 es->s_first_error_ino = es->s_last_error_ino;
369 es->s_first_error_block = es->s_last_error_block;
370 }
371 /*
372 * Start the daily error reporting function if it hasn't been
373 * started already
374 */
375 if (!es->s_error_count)
376 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
377 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
378 }
379
380 static void save_error_info(struct super_block *sb, const char *func,
381 unsigned int line)
382 {
383 __save_error_info(sb, func, line);
384 ext4_commit_super(sb, 1);
385 }
386
387
388 /* Deal with the reporting of failure conditions on a filesystem such as
389 * inconsistencies detected or read IO failures.
390 *
391 * On ext2, we can store the error state of the filesystem in the
392 * superblock. That is not possible on ext4, because we may have other
393 * write ordering constraints on the superblock which prevent us from
394 * writing it out straight away; and given that the journal is about to
395 * be aborted, we can't rely on the current, or future, transactions to
396 * write out the superblock safely.
397 *
398 * We'll just use the jbd2_journal_abort() error code to record an error in
399 * the journal instead. On recovery, the journal will complain about
400 * that error until we've noted it down and cleared it.
401 */
402
403 static void ext4_handle_error(struct super_block *sb)
404 {
405 if (sb->s_flags & MS_RDONLY)
406 return;
407
408 if (!test_opt(sb, ERRORS_CONT)) {
409 journal_t *journal = EXT4_SB(sb)->s_journal;
410
411 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
412 if (journal)
413 jbd2_journal_abort(journal, -EIO);
414 }
415 if (test_opt(sb, ERRORS_RO)) {
416 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
417 sb->s_flags |= MS_RDONLY;
418 }
419 if (test_opt(sb, ERRORS_PANIC))
420 panic("EXT4-fs (device %s): panic forced after error\n",
421 sb->s_id);
422 }
423
424 void __ext4_error(struct super_block *sb, const char *function,
425 unsigned int line, const char *fmt, ...)
426 {
427 struct va_format vaf;
428 va_list args;
429
430 va_start(args, fmt);
431 vaf.fmt = fmt;
432 vaf.va = &args;
433 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
434 sb->s_id, function, line, current->comm, &vaf);
435 va_end(args);
436
437 ext4_handle_error(sb);
438 }
439
440 void ext4_error_inode(struct inode *inode, const char *function,
441 unsigned int line, ext4_fsblk_t block,
442 const char *fmt, ...)
443 {
444 va_list args;
445 struct va_format vaf;
446 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
447
448 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
449 es->s_last_error_block = cpu_to_le64(block);
450 save_error_info(inode->i_sb, function, line);
451 va_start(args, fmt);
452 vaf.fmt = fmt;
453 vaf.va = &args;
454 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
455 inode->i_sb->s_id, function, line, inode->i_ino);
456 if (block)
457 printk(KERN_CONT "block %llu: ", block);
458 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
459 va_end(args);
460
461 ext4_handle_error(inode->i_sb);
462 }
463
464 void ext4_error_file(struct file *file, const char *function,
465 unsigned int line, ext4_fsblk_t block,
466 const char *fmt, ...)
467 {
468 va_list args;
469 struct va_format vaf;
470 struct ext4_super_block *es;
471 struct inode *inode = file->f_dentry->d_inode;
472 char pathname[80], *path;
473
474 es = EXT4_SB(inode->i_sb)->s_es;
475 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
476 save_error_info(inode->i_sb, function, line);
477 path = d_path(&(file->f_path), pathname, sizeof(pathname));
478 if (IS_ERR(path))
479 path = "(unknown)";
480 printk(KERN_CRIT
481 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
482 inode->i_sb->s_id, function, line, inode->i_ino);
483 if (block)
484 printk(KERN_CONT "block %llu: ", block);
485 va_start(args, fmt);
486 vaf.fmt = fmt;
487 vaf.va = &args;
488 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
489 va_end(args);
490
491 ext4_handle_error(inode->i_sb);
492 }
493
494 static const char *ext4_decode_error(struct super_block *sb, int errno,
495 char nbuf[16])
496 {
497 char *errstr = NULL;
498
499 switch (errno) {
500 case -EIO:
501 errstr = "IO failure";
502 break;
503 case -ENOMEM:
504 errstr = "Out of memory";
505 break;
506 case -EROFS:
507 if (!sb || (EXT4_SB(sb)->s_journal &&
508 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
509 errstr = "Journal has aborted";
510 else
511 errstr = "Readonly filesystem";
512 break;
513 default:
514 /* If the caller passed in an extra buffer for unknown
515 * errors, textualise them now. Else we just return
516 * NULL. */
517 if (nbuf) {
518 /* Check for truncated error codes... */
519 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
520 errstr = nbuf;
521 }
522 break;
523 }
524
525 return errstr;
526 }
527
528 /* __ext4_std_error decodes expected errors from journaling functions
529 * automatically and invokes the appropriate error response. */
530
531 void __ext4_std_error(struct super_block *sb, const char *function,
532 unsigned int line, int errno)
533 {
534 char nbuf[16];
535 const char *errstr;
536
537 /* Special case: if the error is EROFS, and we're not already
538 * inside a transaction, then there's really no point in logging
539 * an error. */
540 if (errno == -EROFS && journal_current_handle() == NULL &&
541 (sb->s_flags & MS_RDONLY))
542 return;
543
544 errstr = ext4_decode_error(sb, errno, nbuf);
545 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
546 sb->s_id, function, line, errstr);
547 save_error_info(sb, function, line);
548
549 ext4_handle_error(sb);
550 }
551
552 /*
553 * ext4_abort is a much stronger failure handler than ext4_error. The
554 * abort function may be used to deal with unrecoverable failures such
555 * as journal IO errors or ENOMEM at a critical moment in log management.
556 *
557 * We unconditionally force the filesystem into an ABORT|READONLY state,
558 * unless the error response on the fs has been set to panic in which
559 * case we take the easy way out and panic immediately.
560 */
561
562 void __ext4_abort(struct super_block *sb, const char *function,
563 unsigned int line, const char *fmt, ...)
564 {
565 va_list args;
566
567 save_error_info(sb, function, line);
568 va_start(args, fmt);
569 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
570 function, line);
571 vprintk(fmt, args);
572 printk("\n");
573 va_end(args);
574
575 if ((sb->s_flags & MS_RDONLY) == 0) {
576 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
577 sb->s_flags |= MS_RDONLY;
578 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
579 if (EXT4_SB(sb)->s_journal)
580 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
581 save_error_info(sb, function, line);
582 }
583 if (test_opt(sb, ERRORS_PANIC))
584 panic("EXT4-fs panic from previous error\n");
585 }
586
587 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
588 {
589 struct va_format vaf;
590 va_list args;
591
592 va_start(args, fmt);
593 vaf.fmt = fmt;
594 vaf.va = &args;
595 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
596 va_end(args);
597 }
598
599 void __ext4_warning(struct super_block *sb, const char *function,
600 unsigned int line, const char *fmt, ...)
601 {
602 struct va_format vaf;
603 va_list args;
604
605 va_start(args, fmt);
606 vaf.fmt = fmt;
607 vaf.va = &args;
608 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
609 sb->s_id, function, line, &vaf);
610 va_end(args);
611 }
612
613 void __ext4_grp_locked_error(const char *function, unsigned int line,
614 struct super_block *sb, ext4_group_t grp,
615 unsigned long ino, ext4_fsblk_t block,
616 const char *fmt, ...)
617 __releases(bitlock)
618 __acquires(bitlock)
619 {
620 struct va_format vaf;
621 va_list args;
622 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
623
624 es->s_last_error_ino = cpu_to_le32(ino);
625 es->s_last_error_block = cpu_to_le64(block);
626 __save_error_info(sb, function, line);
627
628 va_start(args, fmt);
629
630 vaf.fmt = fmt;
631 vaf.va = &args;
632 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
633 sb->s_id, function, line, grp);
634 if (ino)
635 printk(KERN_CONT "inode %lu: ", ino);
636 if (block)
637 printk(KERN_CONT "block %llu:", (unsigned long long) block);
638 printk(KERN_CONT "%pV\n", &vaf);
639 va_end(args);
640
641 if (test_opt(sb, ERRORS_CONT)) {
642 ext4_commit_super(sb, 0);
643 return;
644 }
645
646 ext4_unlock_group(sb, grp);
647 ext4_handle_error(sb);
648 /*
649 * We only get here in the ERRORS_RO case; relocking the group
650 * may be dangerous, but nothing bad will happen since the
651 * filesystem will have already been marked read/only and the
652 * journal has been aborted. We return 1 as a hint to callers
653 * who might what to use the return value from
654 * ext4_grp_locked_error() to distinguish between the
655 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
656 * aggressively from the ext4 function in question, with a
657 * more appropriate error code.
658 */
659 ext4_lock_group(sb, grp);
660 return;
661 }
662
663 void ext4_update_dynamic_rev(struct super_block *sb)
664 {
665 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
666
667 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
668 return;
669
670 ext4_warning(sb,
671 "updating to rev %d because of new feature flag, "
672 "running e2fsck is recommended",
673 EXT4_DYNAMIC_REV);
674
675 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
676 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
677 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
678 /* leave es->s_feature_*compat flags alone */
679 /* es->s_uuid will be set by e2fsck if empty */
680
681 /*
682 * The rest of the superblock fields should be zero, and if not it
683 * means they are likely already in use, so leave them alone. We
684 * can leave it up to e2fsck to clean up any inconsistencies there.
685 */
686 }
687
688 /*
689 * Open the external journal device
690 */
691 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
692 {
693 struct block_device *bdev;
694 char b[BDEVNAME_SIZE];
695
696 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
697 if (IS_ERR(bdev))
698 goto fail;
699 return bdev;
700
701 fail:
702 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
703 __bdevname(dev, b), PTR_ERR(bdev));
704 return NULL;
705 }
706
707 /*
708 * Release the journal device
709 */
710 static int ext4_blkdev_put(struct block_device *bdev)
711 {
712 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
713 }
714
715 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
716 {
717 struct block_device *bdev;
718 int ret = -ENODEV;
719
720 bdev = sbi->journal_bdev;
721 if (bdev) {
722 ret = ext4_blkdev_put(bdev);
723 sbi->journal_bdev = NULL;
724 }
725 return ret;
726 }
727
728 static inline struct inode *orphan_list_entry(struct list_head *l)
729 {
730 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
731 }
732
733 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
734 {
735 struct list_head *l;
736
737 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
738 le32_to_cpu(sbi->s_es->s_last_orphan));
739
740 printk(KERN_ERR "sb_info orphan list:\n");
741 list_for_each(l, &sbi->s_orphan) {
742 struct inode *inode = orphan_list_entry(l);
743 printk(KERN_ERR " "
744 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
745 inode->i_sb->s_id, inode->i_ino, inode,
746 inode->i_mode, inode->i_nlink,
747 NEXT_ORPHAN(inode));
748 }
749 }
750
751 static void ext4_put_super(struct super_block *sb)
752 {
753 struct ext4_sb_info *sbi = EXT4_SB(sb);
754 struct ext4_super_block *es = sbi->s_es;
755 int i, err;
756
757 ext4_unregister_li_request(sb);
758 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
759
760 flush_workqueue(sbi->dio_unwritten_wq);
761 destroy_workqueue(sbi->dio_unwritten_wq);
762
763 lock_super(sb);
764 if (sb->s_dirt)
765 ext4_commit_super(sb, 1);
766
767 if (sbi->s_journal) {
768 err = jbd2_journal_destroy(sbi->s_journal);
769 sbi->s_journal = NULL;
770 if (err < 0)
771 ext4_abort(sb, "Couldn't clean up the journal");
772 }
773
774 del_timer(&sbi->s_err_report);
775 ext4_release_system_zone(sb);
776 ext4_mb_release(sb);
777 ext4_ext_release(sb);
778 ext4_xattr_put_super(sb);
779
780 if (!(sb->s_flags & MS_RDONLY)) {
781 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
782 es->s_state = cpu_to_le16(sbi->s_mount_state);
783 ext4_commit_super(sb, 1);
784 }
785 if (sbi->s_proc) {
786 remove_proc_entry(sb->s_id, ext4_proc_root);
787 }
788 kobject_del(&sbi->s_kobj);
789
790 for (i = 0; i < sbi->s_gdb_count; i++)
791 brelse(sbi->s_group_desc[i]);
792 kfree(sbi->s_group_desc);
793 if (is_vmalloc_addr(sbi->s_flex_groups))
794 vfree(sbi->s_flex_groups);
795 else
796 kfree(sbi->s_flex_groups);
797 percpu_counter_destroy(&sbi->s_freeblocks_counter);
798 percpu_counter_destroy(&sbi->s_freeinodes_counter);
799 percpu_counter_destroy(&sbi->s_dirs_counter);
800 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
801 brelse(sbi->s_sbh);
802 #ifdef CONFIG_QUOTA
803 for (i = 0; i < MAXQUOTAS; i++)
804 kfree(sbi->s_qf_names[i]);
805 #endif
806
807 /* Debugging code just in case the in-memory inode orphan list
808 * isn't empty. The on-disk one can be non-empty if we've
809 * detected an error and taken the fs readonly, but the
810 * in-memory list had better be clean by this point. */
811 if (!list_empty(&sbi->s_orphan))
812 dump_orphan_list(sb, sbi);
813 J_ASSERT(list_empty(&sbi->s_orphan));
814
815 invalidate_bdev(sb->s_bdev);
816 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
817 /*
818 * Invalidate the journal device's buffers. We don't want them
819 * floating about in memory - the physical journal device may
820 * hotswapped, and it breaks the `ro-after' testing code.
821 */
822 sync_blockdev(sbi->journal_bdev);
823 invalidate_bdev(sbi->journal_bdev);
824 ext4_blkdev_remove(sbi);
825 }
826 if (sbi->s_mmp_tsk)
827 kthread_stop(sbi->s_mmp_tsk);
828 sb->s_fs_info = NULL;
829 /*
830 * Now that we are completely done shutting down the
831 * superblock, we need to actually destroy the kobject.
832 */
833 unlock_super(sb);
834 kobject_put(&sbi->s_kobj);
835 wait_for_completion(&sbi->s_kobj_unregister);
836 kfree(sbi->s_blockgroup_lock);
837 kfree(sbi);
838 }
839
840 static struct kmem_cache *ext4_inode_cachep;
841
842 /*
843 * Called inside transaction, so use GFP_NOFS
844 */
845 static struct inode *ext4_alloc_inode(struct super_block *sb)
846 {
847 struct ext4_inode_info *ei;
848
849 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
850 if (!ei)
851 return NULL;
852
853 ei->vfs_inode.i_version = 1;
854 ei->vfs_inode.i_data.writeback_index = 0;
855 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
856 INIT_LIST_HEAD(&ei->i_prealloc_list);
857 spin_lock_init(&ei->i_prealloc_lock);
858 ei->i_reserved_data_blocks = 0;
859 ei->i_reserved_meta_blocks = 0;
860 ei->i_allocated_meta_blocks = 0;
861 ei->i_da_metadata_calc_len = 0;
862 spin_lock_init(&(ei->i_block_reservation_lock));
863 #ifdef CONFIG_QUOTA
864 ei->i_reserved_quota = 0;
865 #endif
866 ei->jinode = NULL;
867 INIT_LIST_HEAD(&ei->i_completed_io_list);
868 spin_lock_init(&ei->i_completed_io_lock);
869 ei->cur_aio_dio = NULL;
870 ei->i_sync_tid = 0;
871 ei->i_datasync_tid = 0;
872 atomic_set(&ei->i_ioend_count, 0);
873 atomic_set(&ei->i_aiodio_unwritten, 0);
874
875 return &ei->vfs_inode;
876 }
877
878 static int ext4_drop_inode(struct inode *inode)
879 {
880 int drop = generic_drop_inode(inode);
881
882 trace_ext4_drop_inode(inode, drop);
883 return drop;
884 }
885
886 static void ext4_i_callback(struct rcu_head *head)
887 {
888 struct inode *inode = container_of(head, struct inode, i_rcu);
889 INIT_LIST_HEAD(&inode->i_dentry);
890 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
891 }
892
893 static void ext4_destroy_inode(struct inode *inode)
894 {
895 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
896 ext4_msg(inode->i_sb, KERN_ERR,
897 "Inode %lu (%p): orphan list check failed!",
898 inode->i_ino, EXT4_I(inode));
899 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
900 EXT4_I(inode), sizeof(struct ext4_inode_info),
901 true);
902 dump_stack();
903 }
904 call_rcu(&inode->i_rcu, ext4_i_callback);
905 }
906
907 static void init_once(void *foo)
908 {
909 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
910
911 INIT_LIST_HEAD(&ei->i_orphan);
912 #ifdef CONFIG_EXT4_FS_XATTR
913 init_rwsem(&ei->xattr_sem);
914 #endif
915 init_rwsem(&ei->i_data_sem);
916 inode_init_once(&ei->vfs_inode);
917 }
918
919 static int init_inodecache(void)
920 {
921 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
922 sizeof(struct ext4_inode_info),
923 0, (SLAB_RECLAIM_ACCOUNT|
924 SLAB_MEM_SPREAD),
925 init_once);
926 if (ext4_inode_cachep == NULL)
927 return -ENOMEM;
928 return 0;
929 }
930
931 static void destroy_inodecache(void)
932 {
933 kmem_cache_destroy(ext4_inode_cachep);
934 }
935
936 void ext4_clear_inode(struct inode *inode)
937 {
938 invalidate_inode_buffers(inode);
939 end_writeback(inode);
940 dquot_drop(inode);
941 ext4_discard_preallocations(inode);
942 if (EXT4_I(inode)->jinode) {
943 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
944 EXT4_I(inode)->jinode);
945 jbd2_free_inode(EXT4_I(inode)->jinode);
946 EXT4_I(inode)->jinode = NULL;
947 }
948 }
949
950 static inline void ext4_show_quota_options(struct seq_file *seq,
951 struct super_block *sb)
952 {
953 #if defined(CONFIG_QUOTA)
954 struct ext4_sb_info *sbi = EXT4_SB(sb);
955
956 if (sbi->s_jquota_fmt) {
957 char *fmtname = "";
958
959 switch (sbi->s_jquota_fmt) {
960 case QFMT_VFS_OLD:
961 fmtname = "vfsold";
962 break;
963 case QFMT_VFS_V0:
964 fmtname = "vfsv0";
965 break;
966 case QFMT_VFS_V1:
967 fmtname = "vfsv1";
968 break;
969 }
970 seq_printf(seq, ",jqfmt=%s", fmtname);
971 }
972
973 if (sbi->s_qf_names[USRQUOTA])
974 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
975
976 if (sbi->s_qf_names[GRPQUOTA])
977 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
978
979 if (test_opt(sb, USRQUOTA))
980 seq_puts(seq, ",usrquota");
981
982 if (test_opt(sb, GRPQUOTA))
983 seq_puts(seq, ",grpquota");
984 #endif
985 }
986
987 /*
988 * Show an option if
989 * - it's set to a non-default value OR
990 * - if the per-sb default is different from the global default
991 */
992 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
993 {
994 int def_errors;
995 unsigned long def_mount_opts;
996 struct super_block *sb = vfs->mnt_sb;
997 struct ext4_sb_info *sbi = EXT4_SB(sb);
998 struct ext4_super_block *es = sbi->s_es;
999
1000 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1001 def_errors = le16_to_cpu(es->s_errors);
1002
1003 if (sbi->s_sb_block != 1)
1004 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
1005 if (test_opt(sb, MINIX_DF))
1006 seq_puts(seq, ",minixdf");
1007 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
1008 seq_puts(seq, ",grpid");
1009 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
1010 seq_puts(seq, ",nogrpid");
1011 if (sbi->s_resuid != EXT4_DEF_RESUID ||
1012 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
1013 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
1014 }
1015 if (sbi->s_resgid != EXT4_DEF_RESGID ||
1016 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
1017 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
1018 }
1019 if (test_opt(sb, ERRORS_RO)) {
1020 if (def_errors == EXT4_ERRORS_PANIC ||
1021 def_errors == EXT4_ERRORS_CONTINUE) {
1022 seq_puts(seq, ",errors=remount-ro");
1023 }
1024 }
1025 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1026 seq_puts(seq, ",errors=continue");
1027 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1028 seq_puts(seq, ",errors=panic");
1029 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
1030 seq_puts(seq, ",nouid32");
1031 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
1032 seq_puts(seq, ",debug");
1033 if (test_opt(sb, OLDALLOC))
1034 seq_puts(seq, ",oldalloc");
1035 #ifdef CONFIG_EXT4_FS_XATTR
1036 if (test_opt(sb, XATTR_USER))
1037 seq_puts(seq, ",user_xattr");
1038 if (!test_opt(sb, XATTR_USER))
1039 seq_puts(seq, ",nouser_xattr");
1040 #endif
1041 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1042 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
1043 seq_puts(seq, ",acl");
1044 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1045 seq_puts(seq, ",noacl");
1046 #endif
1047 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
1048 seq_printf(seq, ",commit=%u",
1049 (unsigned) (sbi->s_commit_interval / HZ));
1050 }
1051 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1052 seq_printf(seq, ",min_batch_time=%u",
1053 (unsigned) sbi->s_min_batch_time);
1054 }
1055 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1056 seq_printf(seq, ",max_batch_time=%u",
1057 (unsigned) sbi->s_min_batch_time);
1058 }
1059
1060 /*
1061 * We're changing the default of barrier mount option, so
1062 * let's always display its mount state so it's clear what its
1063 * status is.
1064 */
1065 seq_puts(seq, ",barrier=");
1066 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1067 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1068 seq_puts(seq, ",journal_async_commit");
1069 else if (test_opt(sb, JOURNAL_CHECKSUM))
1070 seq_puts(seq, ",journal_checksum");
1071 if (test_opt(sb, I_VERSION))
1072 seq_puts(seq, ",i_version");
1073 if (!test_opt(sb, DELALLOC) &&
1074 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1075 seq_puts(seq, ",nodelalloc");
1076
1077 if (!test_opt(sb, MBLK_IO_SUBMIT))
1078 seq_puts(seq, ",nomblk_io_submit");
1079 if (sbi->s_stripe)
1080 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1081 /*
1082 * journal mode get enabled in different ways
1083 * So just print the value even if we didn't specify it
1084 */
1085 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1086 seq_puts(seq, ",data=journal");
1087 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1088 seq_puts(seq, ",data=ordered");
1089 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1090 seq_puts(seq, ",data=writeback");
1091
1092 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1093 seq_printf(seq, ",inode_readahead_blks=%u",
1094 sbi->s_inode_readahead_blks);
1095
1096 if (test_opt(sb, DATA_ERR_ABORT))
1097 seq_puts(seq, ",data_err=abort");
1098
1099 if (test_opt(sb, NO_AUTO_DA_ALLOC))
1100 seq_puts(seq, ",noauto_da_alloc");
1101
1102 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1103 seq_puts(seq, ",discard");
1104
1105 if (test_opt(sb, NOLOAD))
1106 seq_puts(seq, ",norecovery");
1107
1108 if (test_opt(sb, DIOREAD_NOLOCK))
1109 seq_puts(seq, ",dioread_nolock");
1110
1111 if (test_opt(sb, BLOCK_VALIDITY) &&
1112 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1113 seq_puts(seq, ",block_validity");
1114
1115 if (!test_opt(sb, INIT_INODE_TABLE))
1116 seq_puts(seq, ",noinit_inode_table");
1117 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
1118 seq_printf(seq, ",init_inode_table=%u",
1119 (unsigned) sbi->s_li_wait_mult);
1120
1121 ext4_show_quota_options(seq, sb);
1122
1123 return 0;
1124 }
1125
1126 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1127 u64 ino, u32 generation)
1128 {
1129 struct inode *inode;
1130
1131 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1132 return ERR_PTR(-ESTALE);
1133 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1134 return ERR_PTR(-ESTALE);
1135
1136 /* iget isn't really right if the inode is currently unallocated!!
1137 *
1138 * ext4_read_inode will return a bad_inode if the inode had been
1139 * deleted, so we should be safe.
1140 *
1141 * Currently we don't know the generation for parent directory, so
1142 * a generation of 0 means "accept any"
1143 */
1144 inode = ext4_iget(sb, ino);
1145 if (IS_ERR(inode))
1146 return ERR_CAST(inode);
1147 if (generation && inode->i_generation != generation) {
1148 iput(inode);
1149 return ERR_PTR(-ESTALE);
1150 }
1151
1152 return inode;
1153 }
1154
1155 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1156 int fh_len, int fh_type)
1157 {
1158 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1159 ext4_nfs_get_inode);
1160 }
1161
1162 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1163 int fh_len, int fh_type)
1164 {
1165 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1166 ext4_nfs_get_inode);
1167 }
1168
1169 /*
1170 * Try to release metadata pages (indirect blocks, directories) which are
1171 * mapped via the block device. Since these pages could have journal heads
1172 * which would prevent try_to_free_buffers() from freeing them, we must use
1173 * jbd2 layer's try_to_free_buffers() function to release them.
1174 */
1175 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1176 gfp_t wait)
1177 {
1178 journal_t *journal = EXT4_SB(sb)->s_journal;
1179
1180 WARN_ON(PageChecked(page));
1181 if (!page_has_buffers(page))
1182 return 0;
1183 if (journal)
1184 return jbd2_journal_try_to_free_buffers(journal, page,
1185 wait & ~__GFP_WAIT);
1186 return try_to_free_buffers(page);
1187 }
1188
1189 #ifdef CONFIG_QUOTA
1190 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1191 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1192
1193 static int ext4_write_dquot(struct dquot *dquot);
1194 static int ext4_acquire_dquot(struct dquot *dquot);
1195 static int ext4_release_dquot(struct dquot *dquot);
1196 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1197 static int ext4_write_info(struct super_block *sb, int type);
1198 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1199 struct path *path);
1200 static int ext4_quota_off(struct super_block *sb, int type);
1201 static int ext4_quota_on_mount(struct super_block *sb, int type);
1202 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1203 size_t len, loff_t off);
1204 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1205 const char *data, size_t len, loff_t off);
1206
1207 static const struct dquot_operations ext4_quota_operations = {
1208 .get_reserved_space = ext4_get_reserved_space,
1209 .write_dquot = ext4_write_dquot,
1210 .acquire_dquot = ext4_acquire_dquot,
1211 .release_dquot = ext4_release_dquot,
1212 .mark_dirty = ext4_mark_dquot_dirty,
1213 .write_info = ext4_write_info,
1214 .alloc_dquot = dquot_alloc,
1215 .destroy_dquot = dquot_destroy,
1216 };
1217
1218 static const struct quotactl_ops ext4_qctl_operations = {
1219 .quota_on = ext4_quota_on,
1220 .quota_off = ext4_quota_off,
1221 .quota_sync = dquot_quota_sync,
1222 .get_info = dquot_get_dqinfo,
1223 .set_info = dquot_set_dqinfo,
1224 .get_dqblk = dquot_get_dqblk,
1225 .set_dqblk = dquot_set_dqblk
1226 };
1227 #endif
1228
1229 static const struct super_operations ext4_sops = {
1230 .alloc_inode = ext4_alloc_inode,
1231 .destroy_inode = ext4_destroy_inode,
1232 .write_inode = ext4_write_inode,
1233 .dirty_inode = ext4_dirty_inode,
1234 .drop_inode = ext4_drop_inode,
1235 .evict_inode = ext4_evict_inode,
1236 .put_super = ext4_put_super,
1237 .sync_fs = ext4_sync_fs,
1238 .freeze_fs = ext4_freeze,
1239 .unfreeze_fs = ext4_unfreeze,
1240 .statfs = ext4_statfs,
1241 .remount_fs = ext4_remount,
1242 .show_options = ext4_show_options,
1243 #ifdef CONFIG_QUOTA
1244 .quota_read = ext4_quota_read,
1245 .quota_write = ext4_quota_write,
1246 #endif
1247 .bdev_try_to_free_page = bdev_try_to_free_page,
1248 };
1249
1250 static const struct super_operations ext4_nojournal_sops = {
1251 .alloc_inode = ext4_alloc_inode,
1252 .destroy_inode = ext4_destroy_inode,
1253 .write_inode = ext4_write_inode,
1254 .dirty_inode = ext4_dirty_inode,
1255 .drop_inode = ext4_drop_inode,
1256 .evict_inode = ext4_evict_inode,
1257 .write_super = ext4_write_super,
1258 .put_super = ext4_put_super,
1259 .statfs = ext4_statfs,
1260 .remount_fs = ext4_remount,
1261 .show_options = ext4_show_options,
1262 #ifdef CONFIG_QUOTA
1263 .quota_read = ext4_quota_read,
1264 .quota_write = ext4_quota_write,
1265 #endif
1266 .bdev_try_to_free_page = bdev_try_to_free_page,
1267 };
1268
1269 static const struct export_operations ext4_export_ops = {
1270 .fh_to_dentry = ext4_fh_to_dentry,
1271 .fh_to_parent = ext4_fh_to_parent,
1272 .get_parent = ext4_get_parent,
1273 };
1274
1275 enum {
1276 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1277 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1278 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1279 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1280 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1281 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1282 Opt_journal_update, Opt_journal_dev,
1283 Opt_journal_checksum, Opt_journal_async_commit,
1284 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1285 Opt_data_err_abort, Opt_data_err_ignore,
1286 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1287 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1288 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1289 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1290 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1291 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1292 Opt_inode_readahead_blks, Opt_journal_ioprio,
1293 Opt_dioread_nolock, Opt_dioread_lock,
1294 Opt_discard, Opt_nodiscard,
1295 Opt_init_inode_table, Opt_noinit_inode_table,
1296 };
1297
1298 static const match_table_t tokens = {
1299 {Opt_bsd_df, "bsddf"},
1300 {Opt_minix_df, "minixdf"},
1301 {Opt_grpid, "grpid"},
1302 {Opt_grpid, "bsdgroups"},
1303 {Opt_nogrpid, "nogrpid"},
1304 {Opt_nogrpid, "sysvgroups"},
1305 {Opt_resgid, "resgid=%u"},
1306 {Opt_resuid, "resuid=%u"},
1307 {Opt_sb, "sb=%u"},
1308 {Opt_err_cont, "errors=continue"},
1309 {Opt_err_panic, "errors=panic"},
1310 {Opt_err_ro, "errors=remount-ro"},
1311 {Opt_nouid32, "nouid32"},
1312 {Opt_debug, "debug"},
1313 {Opt_oldalloc, "oldalloc"},
1314 {Opt_orlov, "orlov"},
1315 {Opt_user_xattr, "user_xattr"},
1316 {Opt_nouser_xattr, "nouser_xattr"},
1317 {Opt_acl, "acl"},
1318 {Opt_noacl, "noacl"},
1319 {Opt_noload, "noload"},
1320 {Opt_noload, "norecovery"},
1321 {Opt_nobh, "nobh"},
1322 {Opt_bh, "bh"},
1323 {Opt_commit, "commit=%u"},
1324 {Opt_min_batch_time, "min_batch_time=%u"},
1325 {Opt_max_batch_time, "max_batch_time=%u"},
1326 {Opt_journal_update, "journal=update"},
1327 {Opt_journal_dev, "journal_dev=%u"},
1328 {Opt_journal_checksum, "journal_checksum"},
1329 {Opt_journal_async_commit, "journal_async_commit"},
1330 {Opt_abort, "abort"},
1331 {Opt_data_journal, "data=journal"},
1332 {Opt_data_ordered, "data=ordered"},
1333 {Opt_data_writeback, "data=writeback"},
1334 {Opt_data_err_abort, "data_err=abort"},
1335 {Opt_data_err_ignore, "data_err=ignore"},
1336 {Opt_offusrjquota, "usrjquota="},
1337 {Opt_usrjquota, "usrjquota=%s"},
1338 {Opt_offgrpjquota, "grpjquota="},
1339 {Opt_grpjquota, "grpjquota=%s"},
1340 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1341 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1342 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1343 {Opt_grpquota, "grpquota"},
1344 {Opt_noquota, "noquota"},
1345 {Opt_quota, "quota"},
1346 {Opt_usrquota, "usrquota"},
1347 {Opt_barrier, "barrier=%u"},
1348 {Opt_barrier, "barrier"},
1349 {Opt_nobarrier, "nobarrier"},
1350 {Opt_i_version, "i_version"},
1351 {Opt_stripe, "stripe=%u"},
1352 {Opt_resize, "resize"},
1353 {Opt_delalloc, "delalloc"},
1354 {Opt_nodelalloc, "nodelalloc"},
1355 {Opt_mblk_io_submit, "mblk_io_submit"},
1356 {Opt_nomblk_io_submit, "nomblk_io_submit"},
1357 {Opt_block_validity, "block_validity"},
1358 {Opt_noblock_validity, "noblock_validity"},
1359 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1360 {Opt_journal_ioprio, "journal_ioprio=%u"},
1361 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1362 {Opt_auto_da_alloc, "auto_da_alloc"},
1363 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1364 {Opt_dioread_nolock, "dioread_nolock"},
1365 {Opt_dioread_lock, "dioread_lock"},
1366 {Opt_discard, "discard"},
1367 {Opt_nodiscard, "nodiscard"},
1368 {Opt_init_inode_table, "init_itable=%u"},
1369 {Opt_init_inode_table, "init_itable"},
1370 {Opt_noinit_inode_table, "noinit_itable"},
1371 {Opt_err, NULL},
1372 };
1373
1374 static ext4_fsblk_t get_sb_block(void **data)
1375 {
1376 ext4_fsblk_t sb_block;
1377 char *options = (char *) *data;
1378
1379 if (!options || strncmp(options, "sb=", 3) != 0)
1380 return 1; /* Default location */
1381
1382 options += 3;
1383 /* TODO: use simple_strtoll with >32bit ext4 */
1384 sb_block = simple_strtoul(options, &options, 0);
1385 if (*options && *options != ',') {
1386 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1387 (char *) *data);
1388 return 1;
1389 }
1390 if (*options == ',')
1391 options++;
1392 *data = (void *) options;
1393
1394 return sb_block;
1395 }
1396
1397 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1398 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1399 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1400
1401 #ifdef CONFIG_QUOTA
1402 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1403 {
1404 struct ext4_sb_info *sbi = EXT4_SB(sb);
1405 char *qname;
1406
1407 if (sb_any_quota_loaded(sb) &&
1408 !sbi->s_qf_names[qtype]) {
1409 ext4_msg(sb, KERN_ERR,
1410 "Cannot change journaled "
1411 "quota options when quota turned on");
1412 return 0;
1413 }
1414 qname = match_strdup(args);
1415 if (!qname) {
1416 ext4_msg(sb, KERN_ERR,
1417 "Not enough memory for storing quotafile name");
1418 return 0;
1419 }
1420 if (sbi->s_qf_names[qtype] &&
1421 strcmp(sbi->s_qf_names[qtype], qname)) {
1422 ext4_msg(sb, KERN_ERR,
1423 "%s quota file already specified", QTYPE2NAME(qtype));
1424 kfree(qname);
1425 return 0;
1426 }
1427 sbi->s_qf_names[qtype] = qname;
1428 if (strchr(sbi->s_qf_names[qtype], '/')) {
1429 ext4_msg(sb, KERN_ERR,
1430 "quotafile must be on filesystem root");
1431 kfree(sbi->s_qf_names[qtype]);
1432 sbi->s_qf_names[qtype] = NULL;
1433 return 0;
1434 }
1435 set_opt(sb, QUOTA);
1436 return 1;
1437 }
1438
1439 static int clear_qf_name(struct super_block *sb, int qtype)
1440 {
1441
1442 struct ext4_sb_info *sbi = EXT4_SB(sb);
1443
1444 if (sb_any_quota_loaded(sb) &&
1445 sbi->s_qf_names[qtype]) {
1446 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1447 " when quota turned on");
1448 return 0;
1449 }
1450 /*
1451 * The space will be released later when all options are confirmed
1452 * to be correct
1453 */
1454 sbi->s_qf_names[qtype] = NULL;
1455 return 1;
1456 }
1457 #endif
1458
1459 static int parse_options(char *options, struct super_block *sb,
1460 unsigned long *journal_devnum,
1461 unsigned int *journal_ioprio,
1462 ext4_fsblk_t *n_blocks_count, int is_remount)
1463 {
1464 struct ext4_sb_info *sbi = EXT4_SB(sb);
1465 char *p;
1466 substring_t args[MAX_OPT_ARGS];
1467 int data_opt = 0;
1468 int option;
1469 #ifdef CONFIG_QUOTA
1470 int qfmt;
1471 #endif
1472
1473 if (!options)
1474 return 1;
1475
1476 while ((p = strsep(&options, ",")) != NULL) {
1477 int token;
1478 if (!*p)
1479 continue;
1480
1481 /*
1482 * Initialize args struct so we know whether arg was
1483 * found; some options take optional arguments.
1484 */
1485 args[0].to = args[0].from = NULL;
1486 token = match_token(p, tokens, args);
1487 switch (token) {
1488 case Opt_bsd_df:
1489 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1490 clear_opt(sb, MINIX_DF);
1491 break;
1492 case Opt_minix_df:
1493 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1494 set_opt(sb, MINIX_DF);
1495
1496 break;
1497 case Opt_grpid:
1498 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1499 set_opt(sb, GRPID);
1500
1501 break;
1502 case Opt_nogrpid:
1503 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1504 clear_opt(sb, GRPID);
1505
1506 break;
1507 case Opt_resuid:
1508 if (match_int(&args[0], &option))
1509 return 0;
1510 sbi->s_resuid = option;
1511 break;
1512 case Opt_resgid:
1513 if (match_int(&args[0], &option))
1514 return 0;
1515 sbi->s_resgid = option;
1516 break;
1517 case Opt_sb:
1518 /* handled by get_sb_block() instead of here */
1519 /* *sb_block = match_int(&args[0]); */
1520 break;
1521 case Opt_err_panic:
1522 clear_opt(sb, ERRORS_CONT);
1523 clear_opt(sb, ERRORS_RO);
1524 set_opt(sb, ERRORS_PANIC);
1525 break;
1526 case Opt_err_ro:
1527 clear_opt(sb, ERRORS_CONT);
1528 clear_opt(sb, ERRORS_PANIC);
1529 set_opt(sb, ERRORS_RO);
1530 break;
1531 case Opt_err_cont:
1532 clear_opt(sb, ERRORS_RO);
1533 clear_opt(sb, ERRORS_PANIC);
1534 set_opt(sb, ERRORS_CONT);
1535 break;
1536 case Opt_nouid32:
1537 set_opt(sb, NO_UID32);
1538 break;
1539 case Opt_debug:
1540 set_opt(sb, DEBUG);
1541 break;
1542 case Opt_oldalloc:
1543 set_opt(sb, OLDALLOC);
1544 break;
1545 case Opt_orlov:
1546 clear_opt(sb, OLDALLOC);
1547 break;
1548 #ifdef CONFIG_EXT4_FS_XATTR
1549 case Opt_user_xattr:
1550 set_opt(sb, XATTR_USER);
1551 break;
1552 case Opt_nouser_xattr:
1553 clear_opt(sb, XATTR_USER);
1554 break;
1555 #else
1556 case Opt_user_xattr:
1557 case Opt_nouser_xattr:
1558 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1559 break;
1560 #endif
1561 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1562 case Opt_acl:
1563 set_opt(sb, POSIX_ACL);
1564 break;
1565 case Opt_noacl:
1566 clear_opt(sb, POSIX_ACL);
1567 break;
1568 #else
1569 case Opt_acl:
1570 case Opt_noacl:
1571 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1572 break;
1573 #endif
1574 case Opt_journal_update:
1575 /* @@@ FIXME */
1576 /* Eventually we will want to be able to create
1577 a journal file here. For now, only allow the
1578 user to specify an existing inode to be the
1579 journal file. */
1580 if (is_remount) {
1581 ext4_msg(sb, KERN_ERR,
1582 "Cannot specify journal on remount");
1583 return 0;
1584 }
1585 set_opt(sb, UPDATE_JOURNAL);
1586 break;
1587 case Opt_journal_dev:
1588 if (is_remount) {
1589 ext4_msg(sb, KERN_ERR,
1590 "Cannot specify journal on remount");
1591 return 0;
1592 }
1593 if (match_int(&args[0], &option))
1594 return 0;
1595 *journal_devnum = option;
1596 break;
1597 case Opt_journal_checksum:
1598 set_opt(sb, JOURNAL_CHECKSUM);
1599 break;
1600 case Opt_journal_async_commit:
1601 set_opt(sb, JOURNAL_ASYNC_COMMIT);
1602 set_opt(sb, JOURNAL_CHECKSUM);
1603 break;
1604 case Opt_noload:
1605 set_opt(sb, NOLOAD);
1606 break;
1607 case Opt_commit:
1608 if (match_int(&args[0], &option))
1609 return 0;
1610 if (option < 0)
1611 return 0;
1612 if (option == 0)
1613 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1614 sbi->s_commit_interval = HZ * option;
1615 break;
1616 case Opt_max_batch_time:
1617 if (match_int(&args[0], &option))
1618 return 0;
1619 if (option < 0)
1620 return 0;
1621 if (option == 0)
1622 option = EXT4_DEF_MAX_BATCH_TIME;
1623 sbi->s_max_batch_time = option;
1624 break;
1625 case Opt_min_batch_time:
1626 if (match_int(&args[0], &option))
1627 return 0;
1628 if (option < 0)
1629 return 0;
1630 sbi->s_min_batch_time = option;
1631 break;
1632 case Opt_data_journal:
1633 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1634 goto datacheck;
1635 case Opt_data_ordered:
1636 data_opt = EXT4_MOUNT_ORDERED_DATA;
1637 goto datacheck;
1638 case Opt_data_writeback:
1639 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1640 datacheck:
1641 if (is_remount) {
1642 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1643 ext4_msg(sb, KERN_ERR,
1644 "Cannot change data mode on remount");
1645 return 0;
1646 }
1647 } else {
1648 clear_opt(sb, DATA_FLAGS);
1649 sbi->s_mount_opt |= data_opt;
1650 }
1651 break;
1652 case Opt_data_err_abort:
1653 set_opt(sb, DATA_ERR_ABORT);
1654 break;
1655 case Opt_data_err_ignore:
1656 clear_opt(sb, DATA_ERR_ABORT);
1657 break;
1658 #ifdef CONFIG_QUOTA
1659 case Opt_usrjquota:
1660 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1661 return 0;
1662 break;
1663 case Opt_grpjquota:
1664 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1665 return 0;
1666 break;
1667 case Opt_offusrjquota:
1668 if (!clear_qf_name(sb, USRQUOTA))
1669 return 0;
1670 break;
1671 case Opt_offgrpjquota:
1672 if (!clear_qf_name(sb, GRPQUOTA))
1673 return 0;
1674 break;
1675
1676 case Opt_jqfmt_vfsold:
1677 qfmt = QFMT_VFS_OLD;
1678 goto set_qf_format;
1679 case Opt_jqfmt_vfsv0:
1680 qfmt = QFMT_VFS_V0;
1681 goto set_qf_format;
1682 case Opt_jqfmt_vfsv1:
1683 qfmt = QFMT_VFS_V1;
1684 set_qf_format:
1685 if (sb_any_quota_loaded(sb) &&
1686 sbi->s_jquota_fmt != qfmt) {
1687 ext4_msg(sb, KERN_ERR, "Cannot change "
1688 "journaled quota options when "
1689 "quota turned on");
1690 return 0;
1691 }
1692 sbi->s_jquota_fmt = qfmt;
1693 break;
1694 case Opt_quota:
1695 case Opt_usrquota:
1696 set_opt(sb, QUOTA);
1697 set_opt(sb, USRQUOTA);
1698 break;
1699 case Opt_grpquota:
1700 set_opt(sb, QUOTA);
1701 set_opt(sb, GRPQUOTA);
1702 break;
1703 case Opt_noquota:
1704 if (sb_any_quota_loaded(sb)) {
1705 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1706 "options when quota turned on");
1707 return 0;
1708 }
1709 clear_opt(sb, QUOTA);
1710 clear_opt(sb, USRQUOTA);
1711 clear_opt(sb, GRPQUOTA);
1712 break;
1713 #else
1714 case Opt_quota:
1715 case Opt_usrquota:
1716 case Opt_grpquota:
1717 ext4_msg(sb, KERN_ERR,
1718 "quota options not supported");
1719 break;
1720 case Opt_usrjquota:
1721 case Opt_grpjquota:
1722 case Opt_offusrjquota:
1723 case Opt_offgrpjquota:
1724 case Opt_jqfmt_vfsold:
1725 case Opt_jqfmt_vfsv0:
1726 case Opt_jqfmt_vfsv1:
1727 ext4_msg(sb, KERN_ERR,
1728 "journaled quota options not supported");
1729 break;
1730 case Opt_noquota:
1731 break;
1732 #endif
1733 case Opt_abort:
1734 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1735 break;
1736 case Opt_nobarrier:
1737 clear_opt(sb, BARRIER);
1738 break;
1739 case Opt_barrier:
1740 if (args[0].from) {
1741 if (match_int(&args[0], &option))
1742 return 0;
1743 } else
1744 option = 1; /* No argument, default to 1 */
1745 if (option)
1746 set_opt(sb, BARRIER);
1747 else
1748 clear_opt(sb, BARRIER);
1749 break;
1750 case Opt_ignore:
1751 break;
1752 case Opt_resize:
1753 if (!is_remount) {
1754 ext4_msg(sb, KERN_ERR,
1755 "resize option only available "
1756 "for remount");
1757 return 0;
1758 }
1759 if (match_int(&args[0], &option) != 0)
1760 return 0;
1761 *n_blocks_count = option;
1762 break;
1763 case Opt_nobh:
1764 ext4_msg(sb, KERN_WARNING,
1765 "Ignoring deprecated nobh option");
1766 break;
1767 case Opt_bh:
1768 ext4_msg(sb, KERN_WARNING,
1769 "Ignoring deprecated bh option");
1770 break;
1771 case Opt_i_version:
1772 set_opt(sb, I_VERSION);
1773 sb->s_flags |= MS_I_VERSION;
1774 break;
1775 case Opt_nodelalloc:
1776 clear_opt(sb, DELALLOC);
1777 break;
1778 case Opt_mblk_io_submit:
1779 set_opt(sb, MBLK_IO_SUBMIT);
1780 break;
1781 case Opt_nomblk_io_submit:
1782 clear_opt(sb, MBLK_IO_SUBMIT);
1783 break;
1784 case Opt_stripe:
1785 if (match_int(&args[0], &option))
1786 return 0;
1787 if (option < 0)
1788 return 0;
1789 sbi->s_stripe = option;
1790 break;
1791 case Opt_delalloc:
1792 set_opt(sb, DELALLOC);
1793 break;
1794 case Opt_block_validity:
1795 set_opt(sb, BLOCK_VALIDITY);
1796 break;
1797 case Opt_noblock_validity:
1798 clear_opt(sb, BLOCK_VALIDITY);
1799 break;
1800 case Opt_inode_readahead_blks:
1801 if (match_int(&args[0], &option))
1802 return 0;
1803 if (option < 0 || option > (1 << 30))
1804 return 0;
1805 if (option && !is_power_of_2(option)) {
1806 ext4_msg(sb, KERN_ERR,
1807 "EXT4-fs: inode_readahead_blks"
1808 " must be a power of 2");
1809 return 0;
1810 }
1811 sbi->s_inode_readahead_blks = option;
1812 break;
1813 case Opt_journal_ioprio:
1814 if (match_int(&args[0], &option))
1815 return 0;
1816 if (option < 0 || option > 7)
1817 break;
1818 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1819 option);
1820 break;
1821 case Opt_noauto_da_alloc:
1822 set_opt(sb, NO_AUTO_DA_ALLOC);
1823 break;
1824 case Opt_auto_da_alloc:
1825 if (args[0].from) {
1826 if (match_int(&args[0], &option))
1827 return 0;
1828 } else
1829 option = 1; /* No argument, default to 1 */
1830 if (option)
1831 clear_opt(sb, NO_AUTO_DA_ALLOC);
1832 else
1833 set_opt(sb,NO_AUTO_DA_ALLOC);
1834 break;
1835 case Opt_discard:
1836 set_opt(sb, DISCARD);
1837 break;
1838 case Opt_nodiscard:
1839 clear_opt(sb, DISCARD);
1840 break;
1841 case Opt_dioread_nolock:
1842 set_opt(sb, DIOREAD_NOLOCK);
1843 break;
1844 case Opt_dioread_lock:
1845 clear_opt(sb, DIOREAD_NOLOCK);
1846 break;
1847 case Opt_init_inode_table:
1848 set_opt(sb, INIT_INODE_TABLE);
1849 if (args[0].from) {
1850 if (match_int(&args[0], &option))
1851 return 0;
1852 } else
1853 option = EXT4_DEF_LI_WAIT_MULT;
1854 if (option < 0)
1855 return 0;
1856 sbi->s_li_wait_mult = option;
1857 break;
1858 case Opt_noinit_inode_table:
1859 clear_opt(sb, INIT_INODE_TABLE);
1860 break;
1861 default:
1862 ext4_msg(sb, KERN_ERR,
1863 "Unrecognized mount option \"%s\" "
1864 "or missing value", p);
1865 return 0;
1866 }
1867 }
1868 #ifdef CONFIG_QUOTA
1869 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1870 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1871 clear_opt(sb, USRQUOTA);
1872
1873 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1874 clear_opt(sb, GRPQUOTA);
1875
1876 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1877 ext4_msg(sb, KERN_ERR, "old and new quota "
1878 "format mixing");
1879 return 0;
1880 }
1881
1882 if (!sbi->s_jquota_fmt) {
1883 ext4_msg(sb, KERN_ERR, "journaled quota format "
1884 "not specified");
1885 return 0;
1886 }
1887 } else {
1888 if (sbi->s_jquota_fmt) {
1889 ext4_msg(sb, KERN_ERR, "journaled quota format "
1890 "specified with no journaling "
1891 "enabled");
1892 return 0;
1893 }
1894 }
1895 #endif
1896 return 1;
1897 }
1898
1899 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1900 int read_only)
1901 {
1902 struct ext4_sb_info *sbi = EXT4_SB(sb);
1903 int res = 0;
1904
1905 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1906 ext4_msg(sb, KERN_ERR, "revision level too high, "
1907 "forcing read-only mode");
1908 res = MS_RDONLY;
1909 }
1910 if (read_only)
1911 return res;
1912 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1913 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1914 "running e2fsck is recommended");
1915 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1916 ext4_msg(sb, KERN_WARNING,
1917 "warning: mounting fs with errors, "
1918 "running e2fsck is recommended");
1919 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1920 le16_to_cpu(es->s_mnt_count) >=
1921 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1922 ext4_msg(sb, KERN_WARNING,
1923 "warning: maximal mount count reached, "
1924 "running e2fsck is recommended");
1925 else if (le32_to_cpu(es->s_checkinterval) &&
1926 (le32_to_cpu(es->s_lastcheck) +
1927 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1928 ext4_msg(sb, KERN_WARNING,
1929 "warning: checktime reached, "
1930 "running e2fsck is recommended");
1931 if (!sbi->s_journal)
1932 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1933 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1934 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1935 le16_add_cpu(&es->s_mnt_count, 1);
1936 es->s_mtime = cpu_to_le32(get_seconds());
1937 ext4_update_dynamic_rev(sb);
1938 if (sbi->s_journal)
1939 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1940
1941 ext4_commit_super(sb, 1);
1942 if (test_opt(sb, DEBUG))
1943 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1944 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1945 sb->s_blocksize,
1946 sbi->s_groups_count,
1947 EXT4_BLOCKS_PER_GROUP(sb),
1948 EXT4_INODES_PER_GROUP(sb),
1949 sbi->s_mount_opt, sbi->s_mount_opt2);
1950
1951 cleancache_init_fs(sb);
1952 return res;
1953 }
1954
1955 static int ext4_fill_flex_info(struct super_block *sb)
1956 {
1957 struct ext4_sb_info *sbi = EXT4_SB(sb);
1958 struct ext4_group_desc *gdp = NULL;
1959 ext4_group_t flex_group_count;
1960 ext4_group_t flex_group;
1961 int groups_per_flex = 0;
1962 size_t size;
1963 int i;
1964
1965 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1966 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1967
1968 if (groups_per_flex < 2) {
1969 sbi->s_log_groups_per_flex = 0;
1970 return 1;
1971 }
1972
1973 /* We allocate both existing and potentially added groups */
1974 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1975 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1976 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1977 size = flex_group_count * sizeof(struct flex_groups);
1978 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1979 if (sbi->s_flex_groups == NULL) {
1980 sbi->s_flex_groups = vzalloc(size);
1981 if (sbi->s_flex_groups == NULL) {
1982 ext4_msg(sb, KERN_ERR,
1983 "not enough memory for %u flex groups",
1984 flex_group_count);
1985 goto failed;
1986 }
1987 }
1988
1989 for (i = 0; i < sbi->s_groups_count; i++) {
1990 gdp = ext4_get_group_desc(sb, i, NULL);
1991
1992 flex_group = ext4_flex_group(sbi, i);
1993 atomic_add(ext4_free_inodes_count(sb, gdp),
1994 &sbi->s_flex_groups[flex_group].free_inodes);
1995 atomic_add(ext4_free_blks_count(sb, gdp),
1996 &sbi->s_flex_groups[flex_group].free_blocks);
1997 atomic_add(ext4_used_dirs_count(sb, gdp),
1998 &sbi->s_flex_groups[flex_group].used_dirs);
1999 }
2000
2001 return 1;
2002 failed:
2003 return 0;
2004 }
2005
2006 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2007 struct ext4_group_desc *gdp)
2008 {
2009 __u16 crc = 0;
2010
2011 if (sbi->s_es->s_feature_ro_compat &
2012 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
2013 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2014 __le32 le_group = cpu_to_le32(block_group);
2015
2016 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2017 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2018 crc = crc16(crc, (__u8 *)gdp, offset);
2019 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2020 /* for checksum of struct ext4_group_desc do the rest...*/
2021 if ((sbi->s_es->s_feature_incompat &
2022 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2023 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2024 crc = crc16(crc, (__u8 *)gdp + offset,
2025 le16_to_cpu(sbi->s_es->s_desc_size) -
2026 offset);
2027 }
2028
2029 return cpu_to_le16(crc);
2030 }
2031
2032 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
2033 struct ext4_group_desc *gdp)
2034 {
2035 if ((sbi->s_es->s_feature_ro_compat &
2036 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
2037 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
2038 return 0;
2039
2040 return 1;
2041 }
2042
2043 /* Called at mount-time, super-block is locked */
2044 static int ext4_check_descriptors(struct super_block *sb,
2045 ext4_group_t *first_not_zeroed)
2046 {
2047 struct ext4_sb_info *sbi = EXT4_SB(sb);
2048 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2049 ext4_fsblk_t last_block;
2050 ext4_fsblk_t block_bitmap;
2051 ext4_fsblk_t inode_bitmap;
2052 ext4_fsblk_t inode_table;
2053 int flexbg_flag = 0;
2054 ext4_group_t i, grp = sbi->s_groups_count;
2055
2056 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2057 flexbg_flag = 1;
2058
2059 ext4_debug("Checking group descriptors");
2060
2061 for (i = 0; i < sbi->s_groups_count; i++) {
2062 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2063
2064 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2065 last_block = ext4_blocks_count(sbi->s_es) - 1;
2066 else
2067 last_block = first_block +
2068 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2069
2070 if ((grp == sbi->s_groups_count) &&
2071 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2072 grp = i;
2073
2074 block_bitmap = ext4_block_bitmap(sb, gdp);
2075 if (block_bitmap < first_block || block_bitmap > last_block) {
2076 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2077 "Block bitmap for group %u not in group "
2078 "(block %llu)!", i, block_bitmap);
2079 return 0;
2080 }
2081 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2082 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2083 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2084 "Inode bitmap for group %u not in group "
2085 "(block %llu)!", i, inode_bitmap);
2086 return 0;
2087 }
2088 inode_table = ext4_inode_table(sb, gdp);
2089 if (inode_table < first_block ||
2090 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2091 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2092 "Inode table for group %u not in group "
2093 "(block %llu)!", i, inode_table);
2094 return 0;
2095 }
2096 ext4_lock_group(sb, i);
2097 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2098 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2099 "Checksum for group %u failed (%u!=%u)",
2100 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2101 gdp)), le16_to_cpu(gdp->bg_checksum));
2102 if (!(sb->s_flags & MS_RDONLY)) {
2103 ext4_unlock_group(sb, i);
2104 return 0;
2105 }
2106 }
2107 ext4_unlock_group(sb, i);
2108 if (!flexbg_flag)
2109 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2110 }
2111 if (NULL != first_not_zeroed)
2112 *first_not_zeroed = grp;
2113
2114 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2115 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2116 return 1;
2117 }
2118
2119 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2120 * the superblock) which were deleted from all directories, but held open by
2121 * a process at the time of a crash. We walk the list and try to delete these
2122 * inodes at recovery time (only with a read-write filesystem).
2123 *
2124 * In order to keep the orphan inode chain consistent during traversal (in
2125 * case of crash during recovery), we link each inode into the superblock
2126 * orphan list_head and handle it the same way as an inode deletion during
2127 * normal operation (which journals the operations for us).
2128 *
2129 * We only do an iget() and an iput() on each inode, which is very safe if we
2130 * accidentally point at an in-use or already deleted inode. The worst that
2131 * can happen in this case is that we get a "bit already cleared" message from
2132 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2133 * e2fsck was run on this filesystem, and it must have already done the orphan
2134 * inode cleanup for us, so we can safely abort without any further action.
2135 */
2136 static void ext4_orphan_cleanup(struct super_block *sb,
2137 struct ext4_super_block *es)
2138 {
2139 unsigned int s_flags = sb->s_flags;
2140 int nr_orphans = 0, nr_truncates = 0;
2141 #ifdef CONFIG_QUOTA
2142 int i;
2143 #endif
2144 if (!es->s_last_orphan) {
2145 jbd_debug(4, "no orphan inodes to clean up\n");
2146 return;
2147 }
2148
2149 if (bdev_read_only(sb->s_bdev)) {
2150 ext4_msg(sb, KERN_ERR, "write access "
2151 "unavailable, skipping orphan cleanup");
2152 return;
2153 }
2154
2155 /* Check if feature set would not allow a r/w mount */
2156 if (!ext4_feature_set_ok(sb, 0)) {
2157 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2158 "unknown ROCOMPAT features");
2159 return;
2160 }
2161
2162 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2163 if (es->s_last_orphan)
2164 jbd_debug(1, "Errors on filesystem, "
2165 "clearing orphan list.\n");
2166 es->s_last_orphan = 0;
2167 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2168 return;
2169 }
2170
2171 if (s_flags & MS_RDONLY) {
2172 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2173 sb->s_flags &= ~MS_RDONLY;
2174 }
2175 #ifdef CONFIG_QUOTA
2176 /* Needed for iput() to work correctly and not trash data */
2177 sb->s_flags |= MS_ACTIVE;
2178 /* Turn on quotas so that they are updated correctly */
2179 for (i = 0; i < MAXQUOTAS; i++) {
2180 if (EXT4_SB(sb)->s_qf_names[i]) {
2181 int ret = ext4_quota_on_mount(sb, i);
2182 if (ret < 0)
2183 ext4_msg(sb, KERN_ERR,
2184 "Cannot turn on journaled "
2185 "quota: error %d", ret);
2186 }
2187 }
2188 #endif
2189
2190 while (es->s_last_orphan) {
2191 struct inode *inode;
2192
2193 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2194 if (IS_ERR(inode)) {
2195 es->s_last_orphan = 0;
2196 break;
2197 }
2198
2199 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2200 dquot_initialize(inode);
2201 if (inode->i_nlink) {
2202 ext4_msg(sb, KERN_DEBUG,
2203 "%s: truncating inode %lu to %lld bytes",
2204 __func__, inode->i_ino, inode->i_size);
2205 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2206 inode->i_ino, inode->i_size);
2207 ext4_truncate(inode);
2208 nr_truncates++;
2209 } else {
2210 ext4_msg(sb, KERN_DEBUG,
2211 "%s: deleting unreferenced inode %lu",
2212 __func__, inode->i_ino);
2213 jbd_debug(2, "deleting unreferenced inode %lu\n",
2214 inode->i_ino);
2215 nr_orphans++;
2216 }
2217 iput(inode); /* The delete magic happens here! */
2218 }
2219
2220 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2221
2222 if (nr_orphans)
2223 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2224 PLURAL(nr_orphans));
2225 if (nr_truncates)
2226 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2227 PLURAL(nr_truncates));
2228 #ifdef CONFIG_QUOTA
2229 /* Turn quotas off */
2230 for (i = 0; i < MAXQUOTAS; i++) {
2231 if (sb_dqopt(sb)->files[i])
2232 dquot_quota_off(sb, i);
2233 }
2234 #endif
2235 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2236 }
2237
2238 /*
2239 * Maximal extent format file size.
2240 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2241 * extent format containers, within a sector_t, and within i_blocks
2242 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2243 * so that won't be a limiting factor.
2244 *
2245 * However there is other limiting factor. We do store extents in the form
2246 * of starting block and length, hence the resulting length of the extent
2247 * covering maximum file size must fit into on-disk format containers as
2248 * well. Given that length is always by 1 unit bigger than max unit (because
2249 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2250 *
2251 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2252 */
2253 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2254 {
2255 loff_t res;
2256 loff_t upper_limit = MAX_LFS_FILESIZE;
2257
2258 /* small i_blocks in vfs inode? */
2259 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2260 /*
2261 * CONFIG_LBDAF is not enabled implies the inode
2262 * i_block represent total blocks in 512 bytes
2263 * 32 == size of vfs inode i_blocks * 8
2264 */
2265 upper_limit = (1LL << 32) - 1;
2266
2267 /* total blocks in file system block size */
2268 upper_limit >>= (blkbits - 9);
2269 upper_limit <<= blkbits;
2270 }
2271
2272 /*
2273 * 32-bit extent-start container, ee_block. We lower the maxbytes
2274 * by one fs block, so ee_len can cover the extent of maximum file
2275 * size
2276 */
2277 res = (1LL << 32) - 1;
2278 res <<= blkbits;
2279
2280 /* Sanity check against vm- & vfs- imposed limits */
2281 if (res > upper_limit)
2282 res = upper_limit;
2283
2284 return res;
2285 }
2286
2287 /*
2288 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2289 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2290 * We need to be 1 filesystem block less than the 2^48 sector limit.
2291 */
2292 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2293 {
2294 loff_t res = EXT4_NDIR_BLOCKS;
2295 int meta_blocks;
2296 loff_t upper_limit;
2297 /* This is calculated to be the largest file size for a dense, block
2298 * mapped file such that the file's total number of 512-byte sectors,
2299 * including data and all indirect blocks, does not exceed (2^48 - 1).
2300 *
2301 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2302 * number of 512-byte sectors of the file.
2303 */
2304
2305 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2306 /*
2307 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2308 * the inode i_block field represents total file blocks in
2309 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2310 */
2311 upper_limit = (1LL << 32) - 1;
2312
2313 /* total blocks in file system block size */
2314 upper_limit >>= (bits - 9);
2315
2316 } else {
2317 /*
2318 * We use 48 bit ext4_inode i_blocks
2319 * With EXT4_HUGE_FILE_FL set the i_blocks
2320 * represent total number of blocks in
2321 * file system block size
2322 */
2323 upper_limit = (1LL << 48) - 1;
2324
2325 }
2326
2327 /* indirect blocks */
2328 meta_blocks = 1;
2329 /* double indirect blocks */
2330 meta_blocks += 1 + (1LL << (bits-2));
2331 /* tripple indirect blocks */
2332 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2333
2334 upper_limit -= meta_blocks;
2335 upper_limit <<= bits;
2336
2337 res += 1LL << (bits-2);
2338 res += 1LL << (2*(bits-2));
2339 res += 1LL << (3*(bits-2));
2340 res <<= bits;
2341 if (res > upper_limit)
2342 res = upper_limit;
2343
2344 if (res > MAX_LFS_FILESIZE)
2345 res = MAX_LFS_FILESIZE;
2346
2347 return res;
2348 }
2349
2350 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2351 ext4_fsblk_t logical_sb_block, int nr)
2352 {
2353 struct ext4_sb_info *sbi = EXT4_SB(sb);
2354 ext4_group_t bg, first_meta_bg;
2355 int has_super = 0;
2356
2357 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2358
2359 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2360 nr < first_meta_bg)
2361 return logical_sb_block + nr + 1;
2362 bg = sbi->s_desc_per_block * nr;
2363 if (ext4_bg_has_super(sb, bg))
2364 has_super = 1;
2365
2366 return (has_super + ext4_group_first_block_no(sb, bg));
2367 }
2368
2369 /**
2370 * ext4_get_stripe_size: Get the stripe size.
2371 * @sbi: In memory super block info
2372 *
2373 * If we have specified it via mount option, then
2374 * use the mount option value. If the value specified at mount time is
2375 * greater than the blocks per group use the super block value.
2376 * If the super block value is greater than blocks per group return 0.
2377 * Allocator needs it be less than blocks per group.
2378 *
2379 */
2380 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2381 {
2382 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2383 unsigned long stripe_width =
2384 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2385
2386 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2387 return sbi->s_stripe;
2388
2389 if (stripe_width <= sbi->s_blocks_per_group)
2390 return stripe_width;
2391
2392 if (stride <= sbi->s_blocks_per_group)
2393 return stride;
2394
2395 return 0;
2396 }
2397
2398 /* sysfs supprt */
2399
2400 struct ext4_attr {
2401 struct attribute attr;
2402 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2403 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2404 const char *, size_t);
2405 int offset;
2406 };
2407
2408 static int parse_strtoul(const char *buf,
2409 unsigned long max, unsigned long *value)
2410 {
2411 char *endp;
2412
2413 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2414 endp = skip_spaces(endp);
2415 if (*endp || *value > max)
2416 return -EINVAL;
2417
2418 return 0;
2419 }
2420
2421 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2422 struct ext4_sb_info *sbi,
2423 char *buf)
2424 {
2425 return snprintf(buf, PAGE_SIZE, "%llu\n",
2426 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2427 }
2428
2429 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2430 struct ext4_sb_info *sbi, char *buf)
2431 {
2432 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2433
2434 if (!sb->s_bdev->bd_part)
2435 return snprintf(buf, PAGE_SIZE, "0\n");
2436 return snprintf(buf, PAGE_SIZE, "%lu\n",
2437 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2438 sbi->s_sectors_written_start) >> 1);
2439 }
2440
2441 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2442 struct ext4_sb_info *sbi, char *buf)
2443 {
2444 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2445
2446 if (!sb->s_bdev->bd_part)
2447 return snprintf(buf, PAGE_SIZE, "0\n");
2448 return snprintf(buf, PAGE_SIZE, "%llu\n",
2449 (unsigned long long)(sbi->s_kbytes_written +
2450 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2451 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2452 }
2453
2454 static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2455 struct ext4_sb_info *sbi, char *buf)
2456 {
2457 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2458 }
2459
2460 static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2461 struct ext4_sb_info *sbi, char *buf)
2462 {
2463 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2464 }
2465
2466 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2467 struct ext4_sb_info *sbi,
2468 const char *buf, size_t count)
2469 {
2470 unsigned long t;
2471
2472 if (parse_strtoul(buf, 0x40000000, &t))
2473 return -EINVAL;
2474
2475 if (t && !is_power_of_2(t))
2476 return -EINVAL;
2477
2478 sbi->s_inode_readahead_blks = t;
2479 return count;
2480 }
2481
2482 static ssize_t sbi_ui_show(struct ext4_attr *a,
2483 struct ext4_sb_info *sbi, char *buf)
2484 {
2485 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2486
2487 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2488 }
2489
2490 static ssize_t sbi_ui_store(struct ext4_attr *a,
2491 struct ext4_sb_info *sbi,
2492 const char *buf, size_t count)
2493 {
2494 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2495 unsigned long t;
2496
2497 if (parse_strtoul(buf, 0xffffffff, &t))
2498 return -EINVAL;
2499 *ui = t;
2500 return count;
2501 }
2502
2503 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2504 static struct ext4_attr ext4_attr_##_name = { \
2505 .attr = {.name = __stringify(_name), .mode = _mode }, \
2506 .show = _show, \
2507 .store = _store, \
2508 .offset = offsetof(struct ext4_sb_info, _elname), \
2509 }
2510 #define EXT4_ATTR(name, mode, show, store) \
2511 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2512
2513 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2514 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2515 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2516 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2517 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2518 #define ATTR_LIST(name) &ext4_attr_##name.attr
2519
2520 EXT4_RO_ATTR(delayed_allocation_blocks);
2521 EXT4_RO_ATTR(session_write_kbytes);
2522 EXT4_RO_ATTR(lifetime_write_kbytes);
2523 EXT4_RO_ATTR(extent_cache_hits);
2524 EXT4_RO_ATTR(extent_cache_misses);
2525 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2526 inode_readahead_blks_store, s_inode_readahead_blks);
2527 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2528 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2529 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2530 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2531 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2532 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2533 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2534 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2535
2536 static struct attribute *ext4_attrs[] = {
2537 ATTR_LIST(delayed_allocation_blocks),
2538 ATTR_LIST(session_write_kbytes),
2539 ATTR_LIST(lifetime_write_kbytes),
2540 ATTR_LIST(extent_cache_hits),
2541 ATTR_LIST(extent_cache_misses),
2542 ATTR_LIST(inode_readahead_blks),
2543 ATTR_LIST(inode_goal),
2544 ATTR_LIST(mb_stats),
2545 ATTR_LIST(mb_max_to_scan),
2546 ATTR_LIST(mb_min_to_scan),
2547 ATTR_LIST(mb_order2_req),
2548 ATTR_LIST(mb_stream_req),
2549 ATTR_LIST(mb_group_prealloc),
2550 ATTR_LIST(max_writeback_mb_bump),
2551 NULL,
2552 };
2553
2554 /* Features this copy of ext4 supports */
2555 EXT4_INFO_ATTR(lazy_itable_init);
2556 EXT4_INFO_ATTR(batched_discard);
2557
2558 static struct attribute *ext4_feat_attrs[] = {
2559 ATTR_LIST(lazy_itable_init),
2560 ATTR_LIST(batched_discard),
2561 NULL,
2562 };
2563
2564 static ssize_t ext4_attr_show(struct kobject *kobj,
2565 struct attribute *attr, char *buf)
2566 {
2567 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2568 s_kobj);
2569 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2570
2571 return a->show ? a->show(a, sbi, buf) : 0;
2572 }
2573
2574 static ssize_t ext4_attr_store(struct kobject *kobj,
2575 struct attribute *attr,
2576 const char *buf, size_t len)
2577 {
2578 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2579 s_kobj);
2580 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2581
2582 return a->store ? a->store(a, sbi, buf, len) : 0;
2583 }
2584
2585 static void ext4_sb_release(struct kobject *kobj)
2586 {
2587 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2588 s_kobj);
2589 complete(&sbi->s_kobj_unregister);
2590 }
2591
2592 static const struct sysfs_ops ext4_attr_ops = {
2593 .show = ext4_attr_show,
2594 .store = ext4_attr_store,
2595 };
2596
2597 static struct kobj_type ext4_ktype = {
2598 .default_attrs = ext4_attrs,
2599 .sysfs_ops = &ext4_attr_ops,
2600 .release = ext4_sb_release,
2601 };
2602
2603 static void ext4_feat_release(struct kobject *kobj)
2604 {
2605 complete(&ext4_feat->f_kobj_unregister);
2606 }
2607
2608 static struct kobj_type ext4_feat_ktype = {
2609 .default_attrs = ext4_feat_attrs,
2610 .sysfs_ops = &ext4_attr_ops,
2611 .release = ext4_feat_release,
2612 };
2613
2614 /*
2615 * Check whether this filesystem can be mounted based on
2616 * the features present and the RDONLY/RDWR mount requested.
2617 * Returns 1 if this filesystem can be mounted as requested,
2618 * 0 if it cannot be.
2619 */
2620 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2621 {
2622 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2623 ext4_msg(sb, KERN_ERR,
2624 "Couldn't mount because of "
2625 "unsupported optional features (%x)",
2626 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2627 ~EXT4_FEATURE_INCOMPAT_SUPP));
2628 return 0;
2629 }
2630
2631 if (readonly)
2632 return 1;
2633
2634 /* Check that feature set is OK for a read-write mount */
2635 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2636 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2637 "unsupported optional features (%x)",
2638 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2639 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2640 return 0;
2641 }
2642 /*
2643 * Large file size enabled file system can only be mounted
2644 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2645 */
2646 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2647 if (sizeof(blkcnt_t) < sizeof(u64)) {
2648 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2649 "cannot be mounted RDWR without "
2650 "CONFIG_LBDAF");
2651 return 0;
2652 }
2653 }
2654 return 1;
2655 }
2656
2657 /*
2658 * This function is called once a day if we have errors logged
2659 * on the file system
2660 */
2661 static void print_daily_error_info(unsigned long arg)
2662 {
2663 struct super_block *sb = (struct super_block *) arg;
2664 struct ext4_sb_info *sbi;
2665 struct ext4_super_block *es;
2666
2667 sbi = EXT4_SB(sb);
2668 es = sbi->s_es;
2669
2670 if (es->s_error_count)
2671 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2672 le32_to_cpu(es->s_error_count));
2673 if (es->s_first_error_time) {
2674 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2675 sb->s_id, le32_to_cpu(es->s_first_error_time),
2676 (int) sizeof(es->s_first_error_func),
2677 es->s_first_error_func,
2678 le32_to_cpu(es->s_first_error_line));
2679 if (es->s_first_error_ino)
2680 printk(": inode %u",
2681 le32_to_cpu(es->s_first_error_ino));
2682 if (es->s_first_error_block)
2683 printk(": block %llu", (unsigned long long)
2684 le64_to_cpu(es->s_first_error_block));
2685 printk("\n");
2686 }
2687 if (es->s_last_error_time) {
2688 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2689 sb->s_id, le32_to_cpu(es->s_last_error_time),
2690 (int) sizeof(es->s_last_error_func),
2691 es->s_last_error_func,
2692 le32_to_cpu(es->s_last_error_line));
2693 if (es->s_last_error_ino)
2694 printk(": inode %u",
2695 le32_to_cpu(es->s_last_error_ino));
2696 if (es->s_last_error_block)
2697 printk(": block %llu", (unsigned long long)
2698 le64_to_cpu(es->s_last_error_block));
2699 printk("\n");
2700 }
2701 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2702 }
2703
2704 /* Find next suitable group and run ext4_init_inode_table */
2705 static int ext4_run_li_request(struct ext4_li_request *elr)
2706 {
2707 struct ext4_group_desc *gdp = NULL;
2708 ext4_group_t group, ngroups;
2709 struct super_block *sb;
2710 unsigned long timeout = 0;
2711 int ret = 0;
2712
2713 sb = elr->lr_super;
2714 ngroups = EXT4_SB(sb)->s_groups_count;
2715
2716 for (group = elr->lr_next_group; group < ngroups; group++) {
2717 gdp = ext4_get_group_desc(sb, group, NULL);
2718 if (!gdp) {
2719 ret = 1;
2720 break;
2721 }
2722
2723 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2724 break;
2725 }
2726
2727 if (group == ngroups)
2728 ret = 1;
2729
2730 if (!ret) {
2731 timeout = jiffies;
2732 ret = ext4_init_inode_table(sb, group,
2733 elr->lr_timeout ? 0 : 1);
2734 if (elr->lr_timeout == 0) {
2735 timeout = (jiffies - timeout) *
2736 elr->lr_sbi->s_li_wait_mult;
2737 elr->lr_timeout = timeout;
2738 }
2739 elr->lr_next_sched = jiffies + elr->lr_timeout;
2740 elr->lr_next_group = group + 1;
2741 }
2742
2743 return ret;
2744 }
2745
2746 /*
2747 * Remove lr_request from the list_request and free the
2748 * request structure. Should be called with li_list_mtx held
2749 */
2750 static void ext4_remove_li_request(struct ext4_li_request *elr)
2751 {
2752 struct ext4_sb_info *sbi;
2753
2754 if (!elr)
2755 return;
2756
2757 sbi = elr->lr_sbi;
2758
2759 list_del(&elr->lr_request);
2760 sbi->s_li_request = NULL;
2761 kfree(elr);
2762 }
2763
2764 static void ext4_unregister_li_request(struct super_block *sb)
2765 {
2766 mutex_lock(&ext4_li_mtx);
2767 if (!ext4_li_info) {
2768 mutex_unlock(&ext4_li_mtx);
2769 return;
2770 }
2771
2772 mutex_lock(&ext4_li_info->li_list_mtx);
2773 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2774 mutex_unlock(&ext4_li_info->li_list_mtx);
2775 mutex_unlock(&ext4_li_mtx);
2776 }
2777
2778 static struct task_struct *ext4_lazyinit_task;
2779
2780 /*
2781 * This is the function where ext4lazyinit thread lives. It walks
2782 * through the request list searching for next scheduled filesystem.
2783 * When such a fs is found, run the lazy initialization request
2784 * (ext4_rn_li_request) and keep track of the time spend in this
2785 * function. Based on that time we compute next schedule time of
2786 * the request. When walking through the list is complete, compute
2787 * next waking time and put itself into sleep.
2788 */
2789 static int ext4_lazyinit_thread(void *arg)
2790 {
2791 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2792 struct list_head *pos, *n;
2793 struct ext4_li_request *elr;
2794 unsigned long next_wakeup, cur;
2795
2796 BUG_ON(NULL == eli);
2797
2798 cont_thread:
2799 while (true) {
2800 next_wakeup = MAX_JIFFY_OFFSET;
2801
2802 mutex_lock(&eli->li_list_mtx);
2803 if (list_empty(&eli->li_request_list)) {
2804 mutex_unlock(&eli->li_list_mtx);
2805 goto exit_thread;
2806 }
2807
2808 list_for_each_safe(pos, n, &eli->li_request_list) {
2809 elr = list_entry(pos, struct ext4_li_request,
2810 lr_request);
2811
2812 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2813 if (ext4_run_li_request(elr) != 0) {
2814 /* error, remove the lazy_init job */
2815 ext4_remove_li_request(elr);
2816 continue;
2817 }
2818 }
2819
2820 if (time_before(elr->lr_next_sched, next_wakeup))
2821 next_wakeup = elr->lr_next_sched;
2822 }
2823 mutex_unlock(&eli->li_list_mtx);
2824
2825 if (freezing(current))
2826 refrigerator();
2827
2828 cur = jiffies;
2829 if ((time_after_eq(cur, next_wakeup)) ||
2830 (MAX_JIFFY_OFFSET == next_wakeup)) {
2831 cond_resched();
2832 continue;
2833 }
2834
2835 schedule_timeout_interruptible(next_wakeup - cur);
2836
2837 if (kthread_should_stop()) {
2838 ext4_clear_request_list();
2839 goto exit_thread;
2840 }
2841 }
2842
2843 exit_thread:
2844 /*
2845 * It looks like the request list is empty, but we need
2846 * to check it under the li_list_mtx lock, to prevent any
2847 * additions into it, and of course we should lock ext4_li_mtx
2848 * to atomically free the list and ext4_li_info, because at
2849 * this point another ext4 filesystem could be registering
2850 * new one.
2851 */
2852 mutex_lock(&ext4_li_mtx);
2853 mutex_lock(&eli->li_list_mtx);
2854 if (!list_empty(&eli->li_request_list)) {
2855 mutex_unlock(&eli->li_list_mtx);
2856 mutex_unlock(&ext4_li_mtx);
2857 goto cont_thread;
2858 }
2859 mutex_unlock(&eli->li_list_mtx);
2860 kfree(ext4_li_info);
2861 ext4_li_info = NULL;
2862 mutex_unlock(&ext4_li_mtx);
2863
2864 return 0;
2865 }
2866
2867 static void ext4_clear_request_list(void)
2868 {
2869 struct list_head *pos, *n;
2870 struct ext4_li_request *elr;
2871
2872 mutex_lock(&ext4_li_info->li_list_mtx);
2873 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2874 elr = list_entry(pos, struct ext4_li_request,
2875 lr_request);
2876 ext4_remove_li_request(elr);
2877 }
2878 mutex_unlock(&ext4_li_info->li_list_mtx);
2879 }
2880
2881 static int ext4_run_lazyinit_thread(void)
2882 {
2883 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2884 ext4_li_info, "ext4lazyinit");
2885 if (IS_ERR(ext4_lazyinit_task)) {
2886 int err = PTR_ERR(ext4_lazyinit_task);
2887 ext4_clear_request_list();
2888 kfree(ext4_li_info);
2889 ext4_li_info = NULL;
2890 printk(KERN_CRIT "EXT4: error %d creating inode table "
2891 "initialization thread\n",
2892 err);
2893 return err;
2894 }
2895 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2896 return 0;
2897 }
2898
2899 /*
2900 * Check whether it make sense to run itable init. thread or not.
2901 * If there is at least one uninitialized inode table, return
2902 * corresponding group number, else the loop goes through all
2903 * groups and return total number of groups.
2904 */
2905 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2906 {
2907 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2908 struct ext4_group_desc *gdp = NULL;
2909
2910 for (group = 0; group < ngroups; group++) {
2911 gdp = ext4_get_group_desc(sb, group, NULL);
2912 if (!gdp)
2913 continue;
2914
2915 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2916 break;
2917 }
2918
2919 return group;
2920 }
2921
2922 static int ext4_li_info_new(void)
2923 {
2924 struct ext4_lazy_init *eli = NULL;
2925
2926 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2927 if (!eli)
2928 return -ENOMEM;
2929
2930 INIT_LIST_HEAD(&eli->li_request_list);
2931 mutex_init(&eli->li_list_mtx);
2932
2933 eli->li_state |= EXT4_LAZYINIT_QUIT;
2934
2935 ext4_li_info = eli;
2936
2937 return 0;
2938 }
2939
2940 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2941 ext4_group_t start)
2942 {
2943 struct ext4_sb_info *sbi = EXT4_SB(sb);
2944 struct ext4_li_request *elr;
2945 unsigned long rnd;
2946
2947 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2948 if (!elr)
2949 return NULL;
2950
2951 elr->lr_super = sb;
2952 elr->lr_sbi = sbi;
2953 elr->lr_next_group = start;
2954
2955 /*
2956 * Randomize first schedule time of the request to
2957 * spread the inode table initialization requests
2958 * better.
2959 */
2960 get_random_bytes(&rnd, sizeof(rnd));
2961 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2962 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2963
2964 return elr;
2965 }
2966
2967 static int ext4_register_li_request(struct super_block *sb,
2968 ext4_group_t first_not_zeroed)
2969 {
2970 struct ext4_sb_info *sbi = EXT4_SB(sb);
2971 struct ext4_li_request *elr;
2972 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2973 int ret = 0;
2974
2975 if (sbi->s_li_request != NULL) {
2976 /*
2977 * Reset timeout so it can be computed again, because
2978 * s_li_wait_mult might have changed.
2979 */
2980 sbi->s_li_request->lr_timeout = 0;
2981 return 0;
2982 }
2983
2984 if (first_not_zeroed == ngroups ||
2985 (sb->s_flags & MS_RDONLY) ||
2986 !test_opt(sb, INIT_INODE_TABLE))
2987 return 0;
2988
2989 elr = ext4_li_request_new(sb, first_not_zeroed);
2990 if (!elr)
2991 return -ENOMEM;
2992
2993 mutex_lock(&ext4_li_mtx);
2994
2995 if (NULL == ext4_li_info) {
2996 ret = ext4_li_info_new();
2997 if (ret)
2998 goto out;
2999 }
3000
3001 mutex_lock(&ext4_li_info->li_list_mtx);
3002 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3003 mutex_unlock(&ext4_li_info->li_list_mtx);
3004
3005 sbi->s_li_request = elr;
3006 /*
3007 * set elr to NULL here since it has been inserted to
3008 * the request_list and the removal and free of it is
3009 * handled by ext4_clear_request_list from now on.
3010 */
3011 elr = NULL;
3012
3013 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3014 ret = ext4_run_lazyinit_thread();
3015 if (ret)
3016 goto out;
3017 }
3018 out:
3019 mutex_unlock(&ext4_li_mtx);
3020 if (ret)
3021 kfree(elr);
3022 return ret;
3023 }
3024
3025 /*
3026 * We do not need to lock anything since this is called on
3027 * module unload.
3028 */
3029 static void ext4_destroy_lazyinit_thread(void)
3030 {
3031 /*
3032 * If thread exited earlier
3033 * there's nothing to be done.
3034 */
3035 if (!ext4_li_info || !ext4_lazyinit_task)
3036 return;
3037
3038 kthread_stop(ext4_lazyinit_task);
3039 }
3040
3041 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3042 __releases(kernel_lock)
3043 __acquires(kernel_lock)
3044 {
3045 char *orig_data = kstrdup(data, GFP_KERNEL);
3046 struct buffer_head *bh;
3047 struct ext4_super_block *es = NULL;
3048 struct ext4_sb_info *sbi;
3049 ext4_fsblk_t block;
3050 ext4_fsblk_t sb_block = get_sb_block(&data);
3051 ext4_fsblk_t logical_sb_block;
3052 unsigned long offset = 0;
3053 unsigned long journal_devnum = 0;
3054 unsigned long def_mount_opts;
3055 struct inode *root;
3056 char *cp;
3057 const char *descr;
3058 int ret = -ENOMEM;
3059 int blocksize;
3060 unsigned int db_count;
3061 unsigned int i;
3062 int needs_recovery, has_huge_files;
3063 __u64 blocks_count;
3064 int err;
3065 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3066 ext4_group_t first_not_zeroed;
3067
3068 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3069 if (!sbi)
3070 goto out_free_orig;
3071
3072 sbi->s_blockgroup_lock =
3073 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3074 if (!sbi->s_blockgroup_lock) {
3075 kfree(sbi);
3076 goto out_free_orig;
3077 }
3078 sb->s_fs_info = sbi;
3079 sbi->s_mount_opt = 0;
3080 sbi->s_resuid = EXT4_DEF_RESUID;
3081 sbi->s_resgid = EXT4_DEF_RESGID;
3082 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3083 sbi->s_sb_block = sb_block;
3084 if (sb->s_bdev->bd_part)
3085 sbi->s_sectors_written_start =
3086 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3087
3088 /* Cleanup superblock name */
3089 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3090 *cp = '!';
3091
3092 ret = -EINVAL;
3093 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3094 if (!blocksize) {
3095 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3096 goto out_fail;
3097 }
3098
3099 /*
3100 * The ext4 superblock will not be buffer aligned for other than 1kB
3101 * block sizes. We need to calculate the offset from buffer start.
3102 */
3103 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3104 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3105 offset = do_div(logical_sb_block, blocksize);
3106 } else {
3107 logical_sb_block = sb_block;
3108 }
3109
3110 if (!(bh = sb_bread(sb, logical_sb_block))) {
3111 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3112 goto out_fail;
3113 }
3114 /*
3115 * Note: s_es must be initialized as soon as possible because
3116 * some ext4 macro-instructions depend on its value
3117 */
3118 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3119 sbi->s_es = es;
3120 sb->s_magic = le16_to_cpu(es->s_magic);
3121 if (sb->s_magic != EXT4_SUPER_MAGIC)
3122 goto cantfind_ext4;
3123 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3124
3125 /* Set defaults before we parse the mount options */
3126 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3127 set_opt(sb, INIT_INODE_TABLE);
3128 if (def_mount_opts & EXT4_DEFM_DEBUG)
3129 set_opt(sb, DEBUG);
3130 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3131 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3132 "2.6.38");
3133 set_opt(sb, GRPID);
3134 }
3135 if (def_mount_opts & EXT4_DEFM_UID16)
3136 set_opt(sb, NO_UID32);
3137 /* xattr user namespace & acls are now defaulted on */
3138 #ifdef CONFIG_EXT4_FS_XATTR
3139 set_opt(sb, XATTR_USER);
3140 #endif
3141 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3142 set_opt(sb, POSIX_ACL);
3143 #endif
3144 set_opt(sb, MBLK_IO_SUBMIT);
3145 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3146 set_opt(sb, JOURNAL_DATA);
3147 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3148 set_opt(sb, ORDERED_DATA);
3149 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3150 set_opt(sb, WRITEBACK_DATA);
3151
3152 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3153 set_opt(sb, ERRORS_PANIC);
3154 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3155 set_opt(sb, ERRORS_CONT);
3156 else
3157 set_opt(sb, ERRORS_RO);
3158 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3159 set_opt(sb, BLOCK_VALIDITY);
3160 if (def_mount_opts & EXT4_DEFM_DISCARD)
3161 set_opt(sb, DISCARD);
3162
3163 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3164 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3165 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3166 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3167 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3168
3169 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3170 set_opt(sb, BARRIER);
3171
3172 /*
3173 * enable delayed allocation by default
3174 * Use -o nodelalloc to turn it off
3175 */
3176 if (!IS_EXT3_SB(sb) &&
3177 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3178 set_opt(sb, DELALLOC);
3179
3180 /*
3181 * set default s_li_wait_mult for lazyinit, for the case there is
3182 * no mount option specified.
3183 */
3184 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3185
3186 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3187 &journal_devnum, &journal_ioprio, NULL, 0)) {
3188 ext4_msg(sb, KERN_WARNING,
3189 "failed to parse options in superblock: %s",
3190 sbi->s_es->s_mount_opts);
3191 }
3192 if (!parse_options((char *) data, sb, &journal_devnum,
3193 &journal_ioprio, NULL, 0))
3194 goto failed_mount;
3195
3196 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3197 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3198
3199 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3200 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3201 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3202 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3203 ext4_msg(sb, KERN_WARNING,
3204 "feature flags set on rev 0 fs, "
3205 "running e2fsck is recommended");
3206
3207 if (IS_EXT2_SB(sb)) {
3208 if (ext2_feature_set_ok(sb))
3209 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3210 "using the ext4 subsystem");
3211 else {
3212 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3213 "to feature incompatibilities");
3214 goto failed_mount;
3215 }
3216 }
3217
3218 if (IS_EXT3_SB(sb)) {
3219 if (ext3_feature_set_ok(sb))
3220 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3221 "using the ext4 subsystem");
3222 else {
3223 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3224 "to feature incompatibilities");
3225 goto failed_mount;
3226 }
3227 }
3228
3229 /*
3230 * Check feature flags regardless of the revision level, since we
3231 * previously didn't change the revision level when setting the flags,
3232 * so there is a chance incompat flags are set on a rev 0 filesystem.
3233 */
3234 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3235 goto failed_mount;
3236
3237 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3238
3239 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3240 blocksize > EXT4_MAX_BLOCK_SIZE) {
3241 ext4_msg(sb, KERN_ERR,
3242 "Unsupported filesystem blocksize %d", blocksize);
3243 goto failed_mount;
3244 }
3245
3246 if (sb->s_blocksize != blocksize) {
3247 /* Validate the filesystem blocksize */
3248 if (!sb_set_blocksize(sb, blocksize)) {
3249 ext4_msg(sb, KERN_ERR, "bad block size %d",
3250 blocksize);
3251 goto failed_mount;
3252 }
3253
3254 brelse(bh);
3255 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3256 offset = do_div(logical_sb_block, blocksize);
3257 bh = sb_bread(sb, logical_sb_block);
3258 if (!bh) {
3259 ext4_msg(sb, KERN_ERR,
3260 "Can't read superblock on 2nd try");
3261 goto failed_mount;
3262 }
3263 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3264 sbi->s_es = es;
3265 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3266 ext4_msg(sb, KERN_ERR,
3267 "Magic mismatch, very weird!");
3268 goto failed_mount;
3269 }
3270 }
3271
3272 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3273 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3274 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3275 has_huge_files);
3276 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3277
3278 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3279 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3280 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3281 } else {
3282 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3283 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3284 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3285 (!is_power_of_2(sbi->s_inode_size)) ||
3286 (sbi->s_inode_size > blocksize)) {
3287 ext4_msg(sb, KERN_ERR,
3288 "unsupported inode size: %d",
3289 sbi->s_inode_size);
3290 goto failed_mount;
3291 }
3292 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3293 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3294 }
3295
3296 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3297 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3298 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3299 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3300 !is_power_of_2(sbi->s_desc_size)) {
3301 ext4_msg(sb, KERN_ERR,
3302 "unsupported descriptor size %lu",
3303 sbi->s_desc_size);
3304 goto failed_mount;
3305 }
3306 } else
3307 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3308
3309 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3310 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3311 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3312 goto cantfind_ext4;
3313
3314 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3315 if (sbi->s_inodes_per_block == 0)
3316 goto cantfind_ext4;
3317 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3318 sbi->s_inodes_per_block;
3319 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3320 sbi->s_sbh = bh;
3321 sbi->s_mount_state = le16_to_cpu(es->s_state);
3322 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3323 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3324
3325 for (i = 0; i < 4; i++)
3326 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3327 sbi->s_def_hash_version = es->s_def_hash_version;
3328 i = le32_to_cpu(es->s_flags);
3329 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3330 sbi->s_hash_unsigned = 3;
3331 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3332 #ifdef __CHAR_UNSIGNED__
3333 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3334 sbi->s_hash_unsigned = 3;
3335 #else
3336 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3337 #endif
3338 sb->s_dirt = 1;
3339 }
3340
3341 if (sbi->s_blocks_per_group > blocksize * 8) {
3342 ext4_msg(sb, KERN_ERR,
3343 "#blocks per group too big: %lu",
3344 sbi->s_blocks_per_group);
3345 goto failed_mount;
3346 }
3347 if (sbi->s_inodes_per_group > blocksize * 8) {
3348 ext4_msg(sb, KERN_ERR,
3349 "#inodes per group too big: %lu",
3350 sbi->s_inodes_per_group);
3351 goto failed_mount;
3352 }
3353
3354 /*
3355 * Test whether we have more sectors than will fit in sector_t,
3356 * and whether the max offset is addressable by the page cache.
3357 */
3358 err = generic_check_addressable(sb->s_blocksize_bits,
3359 ext4_blocks_count(es));
3360 if (err) {
3361 ext4_msg(sb, KERN_ERR, "filesystem"
3362 " too large to mount safely on this system");
3363 if (sizeof(sector_t) < 8)
3364 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3365 ret = err;
3366 goto failed_mount;
3367 }
3368
3369 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3370 goto cantfind_ext4;
3371
3372 /* check blocks count against device size */
3373 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3374 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3375 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3376 "exceeds size of device (%llu blocks)",
3377 ext4_blocks_count(es), blocks_count);
3378 goto failed_mount;
3379 }
3380
3381 /*
3382 * It makes no sense for the first data block to be beyond the end
3383 * of the filesystem.
3384 */
3385 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3386 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3387 "block %u is beyond end of filesystem (%llu)",
3388 le32_to_cpu(es->s_first_data_block),
3389 ext4_blocks_count(es));
3390 goto failed_mount;
3391 }
3392 blocks_count = (ext4_blocks_count(es) -
3393 le32_to_cpu(es->s_first_data_block) +
3394 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3395 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3396 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3397 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3398 "(block count %llu, first data block %u, "
3399 "blocks per group %lu)", sbi->s_groups_count,
3400 ext4_blocks_count(es),
3401 le32_to_cpu(es->s_first_data_block),
3402 EXT4_BLOCKS_PER_GROUP(sb));
3403 goto failed_mount;
3404 }
3405 sbi->s_groups_count = blocks_count;
3406 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3407 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3408 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3409 EXT4_DESC_PER_BLOCK(sb);
3410 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
3411 GFP_KERNEL);
3412 if (sbi->s_group_desc == NULL) {
3413 ext4_msg(sb, KERN_ERR, "not enough memory");
3414 goto failed_mount;
3415 }
3416
3417 #ifdef CONFIG_PROC_FS
3418 if (ext4_proc_root)
3419 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3420 #endif
3421
3422 bgl_lock_init(sbi->s_blockgroup_lock);
3423
3424 for (i = 0; i < db_count; i++) {
3425 block = descriptor_loc(sb, logical_sb_block, i);
3426 sbi->s_group_desc[i] = sb_bread(sb, block);
3427 if (!sbi->s_group_desc[i]) {
3428 ext4_msg(sb, KERN_ERR,
3429 "can't read group descriptor %d", i);
3430 db_count = i;
3431 goto failed_mount2;
3432 }
3433 }
3434 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3435 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3436 goto failed_mount2;
3437 }
3438 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3439 if (!ext4_fill_flex_info(sb)) {
3440 ext4_msg(sb, KERN_ERR,
3441 "unable to initialize "
3442 "flex_bg meta info!");
3443 goto failed_mount2;
3444 }
3445
3446 sbi->s_gdb_count = db_count;
3447 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3448 spin_lock_init(&sbi->s_next_gen_lock);
3449
3450 init_timer(&sbi->s_err_report);
3451 sbi->s_err_report.function = print_daily_error_info;
3452 sbi->s_err_report.data = (unsigned long) sb;
3453
3454 err = percpu_counter_init(&sbi->s_freeblocks_counter,
3455 ext4_count_free_blocks(sb));
3456 if (!err) {
3457 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3458 ext4_count_free_inodes(sb));
3459 }
3460 if (!err) {
3461 err = percpu_counter_init(&sbi->s_dirs_counter,
3462 ext4_count_dirs(sb));
3463 }
3464 if (!err) {
3465 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3466 }
3467 if (err) {
3468 ext4_msg(sb, KERN_ERR, "insufficient memory");
3469 goto failed_mount3;
3470 }
3471
3472 sbi->s_stripe = ext4_get_stripe_size(sbi);
3473 sbi->s_max_writeback_mb_bump = 128;
3474
3475 /*
3476 * set up enough so that it can read an inode
3477 */
3478 if (!test_opt(sb, NOLOAD) &&
3479 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3480 sb->s_op = &ext4_sops;
3481 else
3482 sb->s_op = &ext4_nojournal_sops;
3483 sb->s_export_op = &ext4_export_ops;
3484 sb->s_xattr = ext4_xattr_handlers;
3485 #ifdef CONFIG_QUOTA
3486 sb->s_qcop = &ext4_qctl_operations;
3487 sb->dq_op = &ext4_quota_operations;
3488 #endif
3489 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3490
3491 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3492 mutex_init(&sbi->s_orphan_lock);
3493 mutex_init(&sbi->s_resize_lock);
3494
3495 sb->s_root = NULL;
3496
3497 needs_recovery = (es->s_last_orphan != 0 ||
3498 EXT4_HAS_INCOMPAT_FEATURE(sb,
3499 EXT4_FEATURE_INCOMPAT_RECOVER));
3500
3501 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3502 !(sb->s_flags & MS_RDONLY))
3503 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3504 goto failed_mount3;
3505
3506 /*
3507 * The first inode we look at is the journal inode. Don't try
3508 * root first: it may be modified in the journal!
3509 */
3510 if (!test_opt(sb, NOLOAD) &&
3511 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3512 if (ext4_load_journal(sb, es, journal_devnum))
3513 goto failed_mount3;
3514 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3515 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3516 ext4_msg(sb, KERN_ERR, "required journal recovery "
3517 "suppressed and not mounted read-only");
3518 goto failed_mount_wq;
3519 } else {
3520 clear_opt(sb, DATA_FLAGS);
3521 sbi->s_journal = NULL;
3522 needs_recovery = 0;
3523 goto no_journal;
3524 }
3525
3526 if (ext4_blocks_count(es) > 0xffffffffULL &&
3527 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3528 JBD2_FEATURE_INCOMPAT_64BIT)) {
3529 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3530 goto failed_mount_wq;
3531 }
3532
3533 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3534 jbd2_journal_set_features(sbi->s_journal,
3535 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3536 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3537 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3538 jbd2_journal_set_features(sbi->s_journal,
3539 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3540 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3541 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3542 } else {
3543 jbd2_journal_clear_features(sbi->s_journal,
3544 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3545 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3546 }
3547
3548 /* We have now updated the journal if required, so we can
3549 * validate the data journaling mode. */
3550 switch (test_opt(sb, DATA_FLAGS)) {
3551 case 0:
3552 /* No mode set, assume a default based on the journal
3553 * capabilities: ORDERED_DATA if the journal can
3554 * cope, else JOURNAL_DATA
3555 */
3556 if (jbd2_journal_check_available_features
3557 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3558 set_opt(sb, ORDERED_DATA);
3559 else
3560 set_opt(sb, JOURNAL_DATA);
3561 break;
3562
3563 case EXT4_MOUNT_ORDERED_DATA:
3564 case EXT4_MOUNT_WRITEBACK_DATA:
3565 if (!jbd2_journal_check_available_features
3566 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3567 ext4_msg(sb, KERN_ERR, "Journal does not support "
3568 "requested data journaling mode");
3569 goto failed_mount_wq;
3570 }
3571 default:
3572 break;
3573 }
3574 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3575
3576 /*
3577 * The journal may have updated the bg summary counts, so we
3578 * need to update the global counters.
3579 */
3580 percpu_counter_set(&sbi->s_freeblocks_counter,
3581 ext4_count_free_blocks(sb));
3582 percpu_counter_set(&sbi->s_freeinodes_counter,
3583 ext4_count_free_inodes(sb));
3584 percpu_counter_set(&sbi->s_dirs_counter,
3585 ext4_count_dirs(sb));
3586 percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
3587
3588 no_journal:
3589 /*
3590 * The maximum number of concurrent works can be high and
3591 * concurrency isn't really necessary. Limit it to 1.
3592 */
3593 EXT4_SB(sb)->dio_unwritten_wq =
3594 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3595 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3596 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3597 goto failed_mount_wq;
3598 }
3599
3600 /*
3601 * The jbd2_journal_load will have done any necessary log recovery,
3602 * so we can safely mount the rest of the filesystem now.
3603 */
3604
3605 root = ext4_iget(sb, EXT4_ROOT_INO);
3606 if (IS_ERR(root)) {
3607 ext4_msg(sb, KERN_ERR, "get root inode failed");
3608 ret = PTR_ERR(root);
3609 root = NULL;
3610 goto failed_mount4;
3611 }
3612 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3613 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3614 goto failed_mount4;
3615 }
3616 sb->s_root = d_alloc_root(root);
3617 if (!sb->s_root) {
3618 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3619 ret = -ENOMEM;
3620 goto failed_mount4;
3621 }
3622
3623 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3624
3625 /* determine the minimum size of new large inodes, if present */
3626 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3627 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3628 EXT4_GOOD_OLD_INODE_SIZE;
3629 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3630 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3631 if (sbi->s_want_extra_isize <
3632 le16_to_cpu(es->s_want_extra_isize))
3633 sbi->s_want_extra_isize =
3634 le16_to_cpu(es->s_want_extra_isize);
3635 if (sbi->s_want_extra_isize <
3636 le16_to_cpu(es->s_min_extra_isize))
3637 sbi->s_want_extra_isize =
3638 le16_to_cpu(es->s_min_extra_isize);
3639 }
3640 }
3641 /* Check if enough inode space is available */
3642 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3643 sbi->s_inode_size) {
3644 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3645 EXT4_GOOD_OLD_INODE_SIZE;
3646 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3647 "available");
3648 }
3649
3650 if (test_opt(sb, DELALLOC) &&
3651 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
3652 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3653 "requested data journaling mode");
3654 clear_opt(sb, DELALLOC);
3655 }
3656 if (test_opt(sb, DIOREAD_NOLOCK)) {
3657 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3658 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3659 "option - requested data journaling mode");
3660 clear_opt(sb, DIOREAD_NOLOCK);
3661 }
3662 if (sb->s_blocksize < PAGE_SIZE) {
3663 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3664 "option - block size is too small");
3665 clear_opt(sb, DIOREAD_NOLOCK);
3666 }
3667 }
3668
3669 err = ext4_setup_system_zone(sb);
3670 if (err) {
3671 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3672 "zone (%d)", err);
3673 goto failed_mount4;
3674 }
3675
3676 ext4_ext_init(sb);
3677 err = ext4_mb_init(sb, needs_recovery);
3678 if (err) {
3679 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3680 err);
3681 goto failed_mount4;
3682 }
3683
3684 err = ext4_register_li_request(sb, first_not_zeroed);
3685 if (err)
3686 goto failed_mount4;
3687
3688 sbi->s_kobj.kset = ext4_kset;
3689 init_completion(&sbi->s_kobj_unregister);
3690 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3691 "%s", sb->s_id);
3692 if (err) {
3693 ext4_mb_release(sb);
3694 ext4_ext_release(sb);
3695 goto failed_mount4;
3696 };
3697
3698 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3699 ext4_orphan_cleanup(sb, es);
3700 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3701 if (needs_recovery) {
3702 ext4_msg(sb, KERN_INFO, "recovery complete");
3703 ext4_mark_recovery_complete(sb, es);
3704 }
3705 if (EXT4_SB(sb)->s_journal) {
3706 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3707 descr = " journalled data mode";
3708 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3709 descr = " ordered data mode";
3710 else
3711 descr = " writeback data mode";
3712 } else
3713 descr = "out journal";
3714
3715 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3716 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3717 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3718
3719 if (es->s_error_count)
3720 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3721
3722 kfree(orig_data);
3723 return 0;
3724
3725 cantfind_ext4:
3726 if (!silent)
3727 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3728 goto failed_mount;
3729
3730 failed_mount4:
3731 iput(root);
3732 sb->s_root = NULL;
3733 ext4_msg(sb, KERN_ERR, "mount failed");
3734 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3735 failed_mount_wq:
3736 ext4_release_system_zone(sb);
3737 if (sbi->s_journal) {
3738 jbd2_journal_destroy(sbi->s_journal);
3739 sbi->s_journal = NULL;
3740 }
3741 failed_mount3:
3742 del_timer(&sbi->s_err_report);
3743 if (sbi->s_flex_groups) {
3744 if (is_vmalloc_addr(sbi->s_flex_groups))
3745 vfree(sbi->s_flex_groups);
3746 else
3747 kfree(sbi->s_flex_groups);
3748 }
3749 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3750 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3751 percpu_counter_destroy(&sbi->s_dirs_counter);
3752 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
3753 if (sbi->s_mmp_tsk)
3754 kthread_stop(sbi->s_mmp_tsk);
3755 failed_mount2:
3756 for (i = 0; i < db_count; i++)
3757 brelse(sbi->s_group_desc[i]);
3758 kfree(sbi->s_group_desc);
3759 failed_mount:
3760 if (sbi->s_proc) {
3761 remove_proc_entry(sb->s_id, ext4_proc_root);
3762 }
3763 #ifdef CONFIG_QUOTA
3764 for (i = 0; i < MAXQUOTAS; i++)
3765 kfree(sbi->s_qf_names[i]);
3766 #endif
3767 ext4_blkdev_remove(sbi);
3768 brelse(bh);
3769 out_fail:
3770 sb->s_fs_info = NULL;
3771 kfree(sbi->s_blockgroup_lock);
3772 kfree(sbi);
3773 out_free_orig:
3774 kfree(orig_data);
3775 return ret;
3776 }
3777
3778 /*
3779 * Setup any per-fs journal parameters now. We'll do this both on
3780 * initial mount, once the journal has been initialised but before we've
3781 * done any recovery; and again on any subsequent remount.
3782 */
3783 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3784 {
3785 struct ext4_sb_info *sbi = EXT4_SB(sb);
3786
3787 journal->j_commit_interval = sbi->s_commit_interval;
3788 journal->j_min_batch_time = sbi->s_min_batch_time;
3789 journal->j_max_batch_time = sbi->s_max_batch_time;
3790
3791 write_lock(&journal->j_state_lock);
3792 if (test_opt(sb, BARRIER))
3793 journal->j_flags |= JBD2_BARRIER;
3794 else
3795 journal->j_flags &= ~JBD2_BARRIER;
3796 if (test_opt(sb, DATA_ERR_ABORT))
3797 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3798 else
3799 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3800 write_unlock(&journal->j_state_lock);
3801 }
3802
3803 static journal_t *ext4_get_journal(struct super_block *sb,
3804 unsigned int journal_inum)
3805 {
3806 struct inode *journal_inode;
3807 journal_t *journal;
3808
3809 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3810
3811 /* First, test for the existence of a valid inode on disk. Bad
3812 * things happen if we iget() an unused inode, as the subsequent
3813 * iput() will try to delete it. */
3814
3815 journal_inode = ext4_iget(sb, journal_inum);
3816 if (IS_ERR(journal_inode)) {
3817 ext4_msg(sb, KERN_ERR, "no journal found");
3818 return NULL;
3819 }
3820 if (!journal_inode->i_nlink) {
3821 make_bad_inode(journal_inode);
3822 iput(journal_inode);
3823 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3824 return NULL;
3825 }
3826
3827 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3828 journal_inode, journal_inode->i_size);
3829 if (!S_ISREG(journal_inode->i_mode)) {
3830 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3831 iput(journal_inode);
3832 return NULL;
3833 }
3834
3835 journal = jbd2_journal_init_inode(journal_inode);
3836 if (!journal) {
3837 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3838 iput(journal_inode);
3839 return NULL;
3840 }
3841 journal->j_private = sb;
3842 ext4_init_journal_params(sb, journal);
3843 return journal;
3844 }
3845
3846 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3847 dev_t j_dev)
3848 {
3849 struct buffer_head *bh;
3850 journal_t *journal;
3851 ext4_fsblk_t start;
3852 ext4_fsblk_t len;
3853 int hblock, blocksize;
3854 ext4_fsblk_t sb_block;
3855 unsigned long offset;
3856 struct ext4_super_block *es;
3857 struct block_device *bdev;
3858
3859 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3860
3861 bdev = ext4_blkdev_get(j_dev, sb);
3862 if (bdev == NULL)
3863 return NULL;
3864
3865 blocksize = sb->s_blocksize;
3866 hblock = bdev_logical_block_size(bdev);
3867 if (blocksize < hblock) {
3868 ext4_msg(sb, KERN_ERR,
3869 "blocksize too small for journal device");
3870 goto out_bdev;
3871 }
3872
3873 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3874 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3875 set_blocksize(bdev, blocksize);
3876 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3877 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3878 "external journal");
3879 goto out_bdev;
3880 }
3881
3882 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3883 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3884 !(le32_to_cpu(es->s_feature_incompat) &
3885 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3886 ext4_msg(sb, KERN_ERR, "external journal has "
3887 "bad superblock");
3888 brelse(bh);
3889 goto out_bdev;
3890 }
3891
3892 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3893 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3894 brelse(bh);
3895 goto out_bdev;
3896 }
3897
3898 len = ext4_blocks_count(es);
3899 start = sb_block + 1;
3900 brelse(bh); /* we're done with the superblock */
3901
3902 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3903 start, len, blocksize);
3904 if (!journal) {
3905 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3906 goto out_bdev;
3907 }
3908 journal->j_private = sb;
3909 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3910 wait_on_buffer(journal->j_sb_buffer);
3911 if (!buffer_uptodate(journal->j_sb_buffer)) {
3912 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3913 goto out_journal;
3914 }
3915 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3916 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3917 "user (unsupported) - %d",
3918 be32_to_cpu(journal->j_superblock->s_nr_users));
3919 goto out_journal;
3920 }
3921 EXT4_SB(sb)->journal_bdev = bdev;
3922 ext4_init_journal_params(sb, journal);
3923 return journal;
3924
3925 out_journal:
3926 jbd2_journal_destroy(journal);
3927 out_bdev:
3928 ext4_blkdev_put(bdev);
3929 return NULL;
3930 }
3931
3932 static int ext4_load_journal(struct super_block *sb,
3933 struct ext4_super_block *es,
3934 unsigned long journal_devnum)
3935 {
3936 journal_t *journal;
3937 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3938 dev_t journal_dev;
3939 int err = 0;
3940 int really_read_only;
3941
3942 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3943
3944 if (journal_devnum &&
3945 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3946 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3947 "numbers have changed");
3948 journal_dev = new_decode_dev(journal_devnum);
3949 } else
3950 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3951
3952 really_read_only = bdev_read_only(sb->s_bdev);
3953
3954 /*
3955 * Are we loading a blank journal or performing recovery after a
3956 * crash? For recovery, we need to check in advance whether we
3957 * can get read-write access to the device.
3958 */
3959 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3960 if (sb->s_flags & MS_RDONLY) {
3961 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3962 "required on readonly filesystem");
3963 if (really_read_only) {
3964 ext4_msg(sb, KERN_ERR, "write access "
3965 "unavailable, cannot proceed");
3966 return -EROFS;
3967 }
3968 ext4_msg(sb, KERN_INFO, "write access will "
3969 "be enabled during recovery");
3970 }
3971 }
3972
3973 if (journal_inum && journal_dev) {
3974 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3975 "and inode journals!");
3976 return -EINVAL;
3977 }
3978
3979 if (journal_inum) {
3980 if (!(journal = ext4_get_journal(sb, journal_inum)))
3981 return -EINVAL;
3982 } else {
3983 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3984 return -EINVAL;
3985 }
3986
3987 if (!(journal->j_flags & JBD2_BARRIER))
3988 ext4_msg(sb, KERN_INFO, "barriers disabled");
3989
3990 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3991 err = jbd2_journal_update_format(journal);
3992 if (err) {
3993 ext4_msg(sb, KERN_ERR, "error updating journal");
3994 jbd2_journal_destroy(journal);
3995 return err;
3996 }
3997 }
3998
3999 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4000 err = jbd2_journal_wipe(journal, !really_read_only);
4001 if (!err) {
4002 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4003 if (save)
4004 memcpy(save, ((char *) es) +
4005 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4006 err = jbd2_journal_load(journal);
4007 if (save)
4008 memcpy(((char *) es) + EXT4_S_ERR_START,
4009 save, EXT4_S_ERR_LEN);
4010 kfree(save);
4011 }
4012
4013 if (err) {
4014 ext4_msg(sb, KERN_ERR, "error loading journal");
4015 jbd2_journal_destroy(journal);
4016 return err;
4017 }
4018
4019 EXT4_SB(sb)->s_journal = journal;
4020 ext4_clear_journal_err(sb, es);
4021
4022 if (!really_read_only && journal_devnum &&
4023 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4024 es->s_journal_dev = cpu_to_le32(journal_devnum);
4025
4026 /* Make sure we flush the recovery flag to disk. */
4027 ext4_commit_super(sb, 1);
4028 }
4029
4030 return 0;
4031 }
4032
4033 static int ext4_commit_super(struct super_block *sb, int sync)
4034 {
4035 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4036 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4037 int error = 0;
4038
4039 if (!sbh)
4040 return error;
4041 if (buffer_write_io_error(sbh)) {
4042 /*
4043 * Oh, dear. A previous attempt to write the
4044 * superblock failed. This could happen because the
4045 * USB device was yanked out. Or it could happen to
4046 * be a transient write error and maybe the block will
4047 * be remapped. Nothing we can do but to retry the
4048 * write and hope for the best.
4049 */
4050 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4051 "superblock detected");
4052 clear_buffer_write_io_error(sbh);
4053 set_buffer_uptodate(sbh);
4054 }
4055 /*
4056 * If the file system is mounted read-only, don't update the
4057 * superblock write time. This avoids updating the superblock
4058 * write time when we are mounting the root file system
4059 * read/only but we need to replay the journal; at that point,
4060 * for people who are east of GMT and who make their clock
4061 * tick in localtime for Windows bug-for-bug compatibility,
4062 * the clock is set in the future, and this will cause e2fsck
4063 * to complain and force a full file system check.
4064 */
4065 if (!(sb->s_flags & MS_RDONLY))
4066 es->s_wtime = cpu_to_le32(get_seconds());
4067 if (sb->s_bdev->bd_part)
4068 es->s_kbytes_written =
4069 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4070 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4071 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4072 else
4073 es->s_kbytes_written =
4074 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4075 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
4076 &EXT4_SB(sb)->s_freeblocks_counter));
4077 es->s_free_inodes_count =
4078 cpu_to_le32(percpu_counter_sum_positive(
4079 &EXT4_SB(sb)->s_freeinodes_counter));
4080 sb->s_dirt = 0;
4081 BUFFER_TRACE(sbh, "marking dirty");
4082 mark_buffer_dirty(sbh);
4083 if (sync) {
4084 error = sync_dirty_buffer(sbh);
4085 if (error)
4086 return error;
4087
4088 error = buffer_write_io_error(sbh);
4089 if (error) {
4090 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4091 "superblock");
4092 clear_buffer_write_io_error(sbh);
4093 set_buffer_uptodate(sbh);
4094 }
4095 }
4096 return error;
4097 }
4098
4099 /*
4100 * Have we just finished recovery? If so, and if we are mounting (or
4101 * remounting) the filesystem readonly, then we will end up with a
4102 * consistent fs on disk. Record that fact.
4103 */
4104 static void ext4_mark_recovery_complete(struct super_block *sb,
4105 struct ext4_super_block *es)
4106 {
4107 journal_t *journal = EXT4_SB(sb)->s_journal;
4108
4109 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4110 BUG_ON(journal != NULL);
4111 return;
4112 }
4113 jbd2_journal_lock_updates(journal);
4114 if (jbd2_journal_flush(journal) < 0)
4115 goto out;
4116
4117 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4118 sb->s_flags & MS_RDONLY) {
4119 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4120 ext4_commit_super(sb, 1);
4121 }
4122
4123 out:
4124 jbd2_journal_unlock_updates(journal);
4125 }
4126
4127 /*
4128 * If we are mounting (or read-write remounting) a filesystem whose journal
4129 * has recorded an error from a previous lifetime, move that error to the
4130 * main filesystem now.
4131 */
4132 static void ext4_clear_journal_err(struct super_block *sb,
4133 struct ext4_super_block *es)
4134 {
4135 journal_t *journal;
4136 int j_errno;
4137 const char *errstr;
4138
4139 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4140
4141 journal = EXT4_SB(sb)->s_journal;
4142
4143 /*
4144 * Now check for any error status which may have been recorded in the
4145 * journal by a prior ext4_error() or ext4_abort()
4146 */
4147
4148 j_errno = jbd2_journal_errno(journal);
4149 if (j_errno) {
4150 char nbuf[16];
4151
4152 errstr = ext4_decode_error(sb, j_errno, nbuf);
4153 ext4_warning(sb, "Filesystem error recorded "
4154 "from previous mount: %s", errstr);
4155 ext4_warning(sb, "Marking fs in need of filesystem check.");
4156
4157 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4158 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4159 ext4_commit_super(sb, 1);
4160
4161 jbd2_journal_clear_err(journal);
4162 }
4163 }
4164
4165 /*
4166 * Force the running and committing transactions to commit,
4167 * and wait on the commit.
4168 */
4169 int ext4_force_commit(struct super_block *sb)
4170 {
4171 journal_t *journal;
4172 int ret = 0;
4173
4174 if (sb->s_flags & MS_RDONLY)
4175 return 0;
4176
4177 journal = EXT4_SB(sb)->s_journal;
4178 if (journal) {
4179 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4180 ret = ext4_journal_force_commit(journal);
4181 }
4182
4183 return ret;
4184 }
4185
4186 static void ext4_write_super(struct super_block *sb)
4187 {
4188 lock_super(sb);
4189 ext4_commit_super(sb, 1);
4190 unlock_super(sb);
4191 }
4192
4193 static int ext4_sync_fs(struct super_block *sb, int wait)
4194 {
4195 int ret = 0;
4196 tid_t target;
4197 struct ext4_sb_info *sbi = EXT4_SB(sb);
4198
4199 trace_ext4_sync_fs(sb, wait);
4200 flush_workqueue(sbi->dio_unwritten_wq);
4201 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4202 if (wait)
4203 jbd2_log_wait_commit(sbi->s_journal, target);
4204 }
4205 return ret;
4206 }
4207
4208 /*
4209 * LVM calls this function before a (read-only) snapshot is created. This
4210 * gives us a chance to flush the journal completely and mark the fs clean.
4211 *
4212 * Note that only this function cannot bring a filesystem to be in a clean
4213 * state independently, because ext4 prevents a new handle from being started
4214 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4215 * the upper layer.
4216 */
4217 static int ext4_freeze(struct super_block *sb)
4218 {
4219 int error = 0;
4220 journal_t *journal;
4221
4222 if (sb->s_flags & MS_RDONLY)
4223 return 0;
4224
4225 journal = EXT4_SB(sb)->s_journal;
4226
4227 /* Now we set up the journal barrier. */
4228 jbd2_journal_lock_updates(journal);
4229
4230 /*
4231 * Don't clear the needs_recovery flag if we failed to flush
4232 * the journal.
4233 */
4234 error = jbd2_journal_flush(journal);
4235 if (error < 0)
4236 goto out;
4237
4238 /* Journal blocked and flushed, clear needs_recovery flag. */
4239 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4240 error = ext4_commit_super(sb, 1);
4241 out:
4242 /* we rely on s_frozen to stop further updates */
4243 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4244 return error;
4245 }
4246
4247 /*
4248 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4249 * flag here, even though the filesystem is not technically dirty yet.
4250 */
4251 static int ext4_unfreeze(struct super_block *sb)
4252 {
4253 if (sb->s_flags & MS_RDONLY)
4254 return 0;
4255
4256 lock_super(sb);
4257 /* Reset the needs_recovery flag before the fs is unlocked. */
4258 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4259 ext4_commit_super(sb, 1);
4260 unlock_super(sb);
4261 return 0;
4262 }
4263
4264 /*
4265 * Structure to save mount options for ext4_remount's benefit
4266 */
4267 struct ext4_mount_options {
4268 unsigned long s_mount_opt;
4269 unsigned long s_mount_opt2;
4270 uid_t s_resuid;
4271 gid_t s_resgid;
4272 unsigned long s_commit_interval;
4273 u32 s_min_batch_time, s_max_batch_time;
4274 #ifdef CONFIG_QUOTA
4275 int s_jquota_fmt;
4276 char *s_qf_names[MAXQUOTAS];
4277 #endif
4278 };
4279
4280 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4281 {
4282 struct ext4_super_block *es;
4283 struct ext4_sb_info *sbi = EXT4_SB(sb);
4284 ext4_fsblk_t n_blocks_count = 0;
4285 unsigned long old_sb_flags;
4286 struct ext4_mount_options old_opts;
4287 int enable_quota = 0;
4288 ext4_group_t g;
4289 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4290 int err = 0;
4291 #ifdef CONFIG_QUOTA
4292 int i;
4293 #endif
4294 char *orig_data = kstrdup(data, GFP_KERNEL);
4295
4296 /* Store the original options */
4297 lock_super(sb);
4298 old_sb_flags = sb->s_flags;
4299 old_opts.s_mount_opt = sbi->s_mount_opt;
4300 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4301 old_opts.s_resuid = sbi->s_resuid;
4302 old_opts.s_resgid = sbi->s_resgid;
4303 old_opts.s_commit_interval = sbi->s_commit_interval;
4304 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4305 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4306 #ifdef CONFIG_QUOTA
4307 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4308 for (i = 0; i < MAXQUOTAS; i++)
4309 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4310 #endif
4311 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4312 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4313
4314 /*
4315 * Allow the "check" option to be passed as a remount option.
4316 */
4317 if (!parse_options(data, sb, NULL, &journal_ioprio,
4318 &n_blocks_count, 1)) {
4319 err = -EINVAL;
4320 goto restore_opts;
4321 }
4322
4323 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4324 ext4_abort(sb, "Abort forced by user");
4325
4326 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4327 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4328
4329 es = sbi->s_es;
4330
4331 if (sbi->s_journal) {
4332 ext4_init_journal_params(sb, sbi->s_journal);
4333 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4334 }
4335
4336 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
4337 n_blocks_count > ext4_blocks_count(es)) {
4338 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4339 err = -EROFS;
4340 goto restore_opts;
4341 }
4342
4343 if (*flags & MS_RDONLY) {
4344 err = dquot_suspend(sb, -1);
4345 if (err < 0)
4346 goto restore_opts;
4347
4348 /*
4349 * First of all, the unconditional stuff we have to do
4350 * to disable replay of the journal when we next remount
4351 */
4352 sb->s_flags |= MS_RDONLY;
4353
4354 /*
4355 * OK, test if we are remounting a valid rw partition
4356 * readonly, and if so set the rdonly flag and then
4357 * mark the partition as valid again.
4358 */
4359 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4360 (sbi->s_mount_state & EXT4_VALID_FS))
4361 es->s_state = cpu_to_le16(sbi->s_mount_state);
4362
4363 if (sbi->s_journal)
4364 ext4_mark_recovery_complete(sb, es);
4365 } else {
4366 /* Make sure we can mount this feature set readwrite */
4367 if (!ext4_feature_set_ok(sb, 0)) {
4368 err = -EROFS;
4369 goto restore_opts;
4370 }
4371 /*
4372 * Make sure the group descriptor checksums
4373 * are sane. If they aren't, refuse to remount r/w.
4374 */
4375 for (g = 0; g < sbi->s_groups_count; g++) {
4376 struct ext4_group_desc *gdp =
4377 ext4_get_group_desc(sb, g, NULL);
4378
4379 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4380 ext4_msg(sb, KERN_ERR,
4381 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4382 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4383 le16_to_cpu(gdp->bg_checksum));
4384 err = -EINVAL;
4385 goto restore_opts;
4386 }
4387 }
4388
4389 /*
4390 * If we have an unprocessed orphan list hanging
4391 * around from a previously readonly bdev mount,
4392 * require a full umount/remount for now.
4393 */
4394 if (es->s_last_orphan) {
4395 ext4_msg(sb, KERN_WARNING, "Couldn't "
4396 "remount RDWR because of unprocessed "
4397 "orphan inode list. Please "
4398 "umount/remount instead");
4399 err = -EINVAL;
4400 goto restore_opts;
4401 }
4402
4403 /*
4404 * Mounting a RDONLY partition read-write, so reread
4405 * and store the current valid flag. (It may have
4406 * been changed by e2fsck since we originally mounted
4407 * the partition.)
4408 */
4409 if (sbi->s_journal)
4410 ext4_clear_journal_err(sb, es);
4411 sbi->s_mount_state = le16_to_cpu(es->s_state);
4412 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
4413 goto restore_opts;
4414 if (!ext4_setup_super(sb, es, 0))
4415 sb->s_flags &= ~MS_RDONLY;
4416 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4417 EXT4_FEATURE_INCOMPAT_MMP))
4418 if (ext4_multi_mount_protect(sb,
4419 le64_to_cpu(es->s_mmp_block))) {
4420 err = -EROFS;
4421 goto restore_opts;
4422 }
4423 enable_quota = 1;
4424 }
4425 }
4426
4427 /*
4428 * Reinitialize lazy itable initialization thread based on
4429 * current settings
4430 */
4431 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4432 ext4_unregister_li_request(sb);
4433 else {
4434 ext4_group_t first_not_zeroed;
4435 first_not_zeroed = ext4_has_uninit_itable(sb);
4436 ext4_register_li_request(sb, first_not_zeroed);
4437 }
4438
4439 ext4_setup_system_zone(sb);
4440 if (sbi->s_journal == NULL)
4441 ext4_commit_super(sb, 1);
4442
4443 #ifdef CONFIG_QUOTA
4444 /* Release old quota file names */
4445 for (i = 0; i < MAXQUOTAS; i++)
4446 if (old_opts.s_qf_names[i] &&
4447 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4448 kfree(old_opts.s_qf_names[i]);
4449 #endif
4450 unlock_super(sb);
4451 if (enable_quota)
4452 dquot_resume(sb, -1);
4453
4454 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4455 kfree(orig_data);
4456 return 0;
4457
4458 restore_opts:
4459 sb->s_flags = old_sb_flags;
4460 sbi->s_mount_opt = old_opts.s_mount_opt;
4461 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4462 sbi->s_resuid = old_opts.s_resuid;
4463 sbi->s_resgid = old_opts.s_resgid;
4464 sbi->s_commit_interval = old_opts.s_commit_interval;
4465 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4466 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4467 #ifdef CONFIG_QUOTA
4468 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4469 for (i = 0; i < MAXQUOTAS; i++) {
4470 if (sbi->s_qf_names[i] &&
4471 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4472 kfree(sbi->s_qf_names[i]);
4473 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4474 }
4475 #endif
4476 unlock_super(sb);
4477 kfree(orig_data);
4478 return err;
4479 }
4480
4481 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4482 {
4483 struct super_block *sb = dentry->d_sb;
4484 struct ext4_sb_info *sbi = EXT4_SB(sb);
4485 struct ext4_super_block *es = sbi->s_es;
4486 u64 fsid;
4487 s64 bfree;
4488
4489 if (test_opt(sb, MINIX_DF)) {
4490 sbi->s_overhead_last = 0;
4491 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4492 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4493 ext4_fsblk_t overhead = 0;
4494
4495 /*
4496 * Compute the overhead (FS structures). This is constant
4497 * for a given filesystem unless the number of block groups
4498 * changes so we cache the previous value until it does.
4499 */
4500
4501 /*
4502 * All of the blocks before first_data_block are
4503 * overhead
4504 */
4505 overhead = le32_to_cpu(es->s_first_data_block);
4506
4507 /*
4508 * Add the overhead attributed to the superblock and
4509 * block group descriptors. If the sparse superblocks
4510 * feature is turned on, then not all groups have this.
4511 */
4512 for (i = 0; i < ngroups; i++) {
4513 overhead += ext4_bg_has_super(sb, i) +
4514 ext4_bg_num_gdb(sb, i);
4515 cond_resched();
4516 }
4517
4518 /*
4519 * Every block group has an inode bitmap, a block
4520 * bitmap, and an inode table.
4521 */
4522 overhead += ngroups * (2 + sbi->s_itb_per_group);
4523 sbi->s_overhead_last = overhead;
4524 smp_wmb();
4525 sbi->s_blocks_last = ext4_blocks_count(es);
4526 }
4527
4528 buf->f_type = EXT4_SUPER_MAGIC;
4529 buf->f_bsize = sb->s_blocksize;
4530 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
4531 bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
4532 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
4533 /* prevent underflow in case that few free space is available */
4534 buf->f_bfree = max_t(s64, bfree, 0);
4535 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4536 if (buf->f_bfree < ext4_r_blocks_count(es))
4537 buf->f_bavail = 0;
4538 buf->f_files = le32_to_cpu(es->s_inodes_count);
4539 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4540 buf->f_namelen = EXT4_NAME_LEN;
4541 fsid = le64_to_cpup((void *)es->s_uuid) ^
4542 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4543 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4544 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4545
4546 return 0;
4547 }
4548
4549 /* Helper function for writing quotas on sync - we need to start transaction
4550 * before quota file is locked for write. Otherwise the are possible deadlocks:
4551 * Process 1 Process 2
4552 * ext4_create() quota_sync()
4553 * jbd2_journal_start() write_dquot()
4554 * dquot_initialize() down(dqio_mutex)
4555 * down(dqio_mutex) jbd2_journal_start()
4556 *
4557 */
4558
4559 #ifdef CONFIG_QUOTA
4560
4561 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4562 {
4563 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4564 }
4565
4566 static int ext4_write_dquot(struct dquot *dquot)
4567 {
4568 int ret, err;
4569 handle_t *handle;
4570 struct inode *inode;
4571
4572 inode = dquot_to_inode(dquot);
4573 handle = ext4_journal_start(inode,
4574 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4575 if (IS_ERR(handle))
4576 return PTR_ERR(handle);
4577 ret = dquot_commit(dquot);
4578 err = ext4_journal_stop(handle);
4579 if (!ret)
4580 ret = err;
4581 return ret;
4582 }
4583
4584 static int ext4_acquire_dquot(struct dquot *dquot)
4585 {
4586 int ret, err;
4587 handle_t *handle;
4588
4589 handle = ext4_journal_start(dquot_to_inode(dquot),
4590 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4591 if (IS_ERR(handle))
4592 return PTR_ERR(handle);
4593 ret = dquot_acquire(dquot);
4594 err = ext4_journal_stop(handle);
4595 if (!ret)
4596 ret = err;
4597 return ret;
4598 }
4599
4600 static int ext4_release_dquot(struct dquot *dquot)
4601 {
4602 int ret, err;
4603 handle_t *handle;
4604
4605 handle = ext4_journal_start(dquot_to_inode(dquot),
4606 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4607 if (IS_ERR(handle)) {
4608 /* Release dquot anyway to avoid endless cycle in dqput() */
4609 dquot_release(dquot);
4610 return PTR_ERR(handle);
4611 }
4612 ret = dquot_release(dquot);
4613 err = ext4_journal_stop(handle);
4614 if (!ret)
4615 ret = err;
4616 return ret;
4617 }
4618
4619 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4620 {
4621 /* Are we journaling quotas? */
4622 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4623 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4624 dquot_mark_dquot_dirty(dquot);
4625 return ext4_write_dquot(dquot);
4626 } else {
4627 return dquot_mark_dquot_dirty(dquot);
4628 }
4629 }
4630
4631 static int ext4_write_info(struct super_block *sb, int type)
4632 {
4633 int ret, err;
4634 handle_t *handle;
4635
4636 /* Data block + inode block */
4637 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4638 if (IS_ERR(handle))
4639 return PTR_ERR(handle);
4640 ret = dquot_commit_info(sb, type);
4641 err = ext4_journal_stop(handle);
4642 if (!ret)
4643 ret = err;
4644 return ret;
4645 }
4646
4647 /*
4648 * Turn on quotas during mount time - we need to find
4649 * the quota file and such...
4650 */
4651 static int ext4_quota_on_mount(struct super_block *sb, int type)
4652 {
4653 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4654 EXT4_SB(sb)->s_jquota_fmt, type);
4655 }
4656
4657 /*
4658 * Standard function to be called on quota_on
4659 */
4660 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4661 struct path *path)
4662 {
4663 int err;
4664
4665 if (!test_opt(sb, QUOTA))
4666 return -EINVAL;
4667
4668 /* Quotafile not on the same filesystem? */
4669 if (path->mnt->mnt_sb != sb)
4670 return -EXDEV;
4671 /* Journaling quota? */
4672 if (EXT4_SB(sb)->s_qf_names[type]) {
4673 /* Quotafile not in fs root? */
4674 if (path->dentry->d_parent != sb->s_root)
4675 ext4_msg(sb, KERN_WARNING,
4676 "Quota file not on filesystem root. "
4677 "Journaled quota will not work");
4678 }
4679
4680 /*
4681 * When we journal data on quota file, we have to flush journal to see
4682 * all updates to the file when we bypass pagecache...
4683 */
4684 if (EXT4_SB(sb)->s_journal &&
4685 ext4_should_journal_data(path->dentry->d_inode)) {
4686 /*
4687 * We don't need to lock updates but journal_flush() could
4688 * otherwise be livelocked...
4689 */
4690 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4691 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4692 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4693 if (err)
4694 return err;
4695 }
4696
4697 return dquot_quota_on(sb, type, format_id, path);
4698 }
4699
4700 static int ext4_quota_off(struct super_block *sb, int type)
4701 {
4702 struct inode *inode = sb_dqopt(sb)->files[type];
4703 handle_t *handle;
4704
4705 /* Force all delayed allocation blocks to be allocated.
4706 * Caller already holds s_umount sem */
4707 if (test_opt(sb, DELALLOC))
4708 sync_filesystem(sb);
4709
4710 if (!inode)
4711 goto out;
4712
4713 /* Update modification times of quota files when userspace can
4714 * start looking at them */
4715 handle = ext4_journal_start(inode, 1);
4716 if (IS_ERR(handle))
4717 goto out;
4718 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4719 ext4_mark_inode_dirty(handle, inode);
4720 ext4_journal_stop(handle);
4721
4722 out:
4723 return dquot_quota_off(sb, type);
4724 }
4725
4726 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4727 * acquiring the locks... As quota files are never truncated and quota code
4728 * itself serializes the operations (and no one else should touch the files)
4729 * we don't have to be afraid of races */
4730 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4731 size_t len, loff_t off)
4732 {
4733 struct inode *inode = sb_dqopt(sb)->files[type];
4734 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4735 int err = 0;
4736 int offset = off & (sb->s_blocksize - 1);
4737 int tocopy;
4738 size_t toread;
4739 struct buffer_head *bh;
4740 loff_t i_size = i_size_read(inode);
4741
4742 if (off > i_size)
4743 return 0;
4744 if (off+len > i_size)
4745 len = i_size-off;
4746 toread = len;
4747 while (toread > 0) {
4748 tocopy = sb->s_blocksize - offset < toread ?
4749 sb->s_blocksize - offset : toread;
4750 bh = ext4_bread(NULL, inode, blk, 0, &err);
4751 if (err)
4752 return err;
4753 if (!bh) /* A hole? */
4754 memset(data, 0, tocopy);
4755 else
4756 memcpy(data, bh->b_data+offset, tocopy);
4757 brelse(bh);
4758 offset = 0;
4759 toread -= tocopy;
4760 data += tocopy;
4761 blk++;
4762 }
4763 return len;
4764 }
4765
4766 /* Write to quotafile (we know the transaction is already started and has
4767 * enough credits) */
4768 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4769 const char *data, size_t len, loff_t off)
4770 {
4771 struct inode *inode = sb_dqopt(sb)->files[type];
4772 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4773 int err = 0;
4774 int offset = off & (sb->s_blocksize - 1);
4775 struct buffer_head *bh;
4776 handle_t *handle = journal_current_handle();
4777
4778 if (EXT4_SB(sb)->s_journal && !handle) {
4779 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4780 " cancelled because transaction is not started",
4781 (unsigned long long)off, (unsigned long long)len);
4782 return -EIO;
4783 }
4784 /*
4785 * Since we account only one data block in transaction credits,
4786 * then it is impossible to cross a block boundary.
4787 */
4788 if (sb->s_blocksize - offset < len) {
4789 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4790 " cancelled because not block aligned",
4791 (unsigned long long)off, (unsigned long long)len);
4792 return -EIO;
4793 }
4794
4795 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4796 bh = ext4_bread(handle, inode, blk, 1, &err);
4797 if (!bh)
4798 goto out;
4799 err = ext4_journal_get_write_access(handle, bh);
4800 if (err) {
4801 brelse(bh);
4802 goto out;
4803 }
4804 lock_buffer(bh);
4805 memcpy(bh->b_data+offset, data, len);
4806 flush_dcache_page(bh->b_page);
4807 unlock_buffer(bh);
4808 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4809 brelse(bh);
4810 out:
4811 if (err) {
4812 mutex_unlock(&inode->i_mutex);
4813 return err;
4814 }
4815 if (inode->i_size < off + len) {
4816 i_size_write(inode, off + len);
4817 EXT4_I(inode)->i_disksize = inode->i_size;
4818 ext4_mark_inode_dirty(handle, inode);
4819 }
4820 mutex_unlock(&inode->i_mutex);
4821 return len;
4822 }
4823
4824 #endif
4825
4826 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4827 const char *dev_name, void *data)
4828 {
4829 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
4830 }
4831
4832 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4833 static inline void register_as_ext2(void)
4834 {
4835 int err = register_filesystem(&ext2_fs_type);
4836 if (err)
4837 printk(KERN_WARNING
4838 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4839 }
4840
4841 static inline void unregister_as_ext2(void)
4842 {
4843 unregister_filesystem(&ext2_fs_type);
4844 }
4845
4846 static inline int ext2_feature_set_ok(struct super_block *sb)
4847 {
4848 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4849 return 0;
4850 if (sb->s_flags & MS_RDONLY)
4851 return 1;
4852 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4853 return 0;
4854 return 1;
4855 }
4856 MODULE_ALIAS("ext2");
4857 #else
4858 static inline void register_as_ext2(void) { }
4859 static inline void unregister_as_ext2(void) { }
4860 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
4861 #endif
4862
4863 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4864 static inline void register_as_ext3(void)
4865 {
4866 int err = register_filesystem(&ext3_fs_type);
4867 if (err)
4868 printk(KERN_WARNING
4869 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4870 }
4871
4872 static inline void unregister_as_ext3(void)
4873 {
4874 unregister_filesystem(&ext3_fs_type);
4875 }
4876
4877 static inline int ext3_feature_set_ok(struct super_block *sb)
4878 {
4879 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4880 return 0;
4881 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4882 return 0;
4883 if (sb->s_flags & MS_RDONLY)
4884 return 1;
4885 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4886 return 0;
4887 return 1;
4888 }
4889 MODULE_ALIAS("ext3");
4890 #else
4891 static inline void register_as_ext3(void) { }
4892 static inline void unregister_as_ext3(void) { }
4893 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
4894 #endif
4895
4896 static struct file_system_type ext4_fs_type = {
4897 .owner = THIS_MODULE,
4898 .name = "ext4",
4899 .mount = ext4_mount,
4900 .kill_sb = kill_block_super,
4901 .fs_flags = FS_REQUIRES_DEV,
4902 };
4903
4904 static int __init ext4_init_feat_adverts(void)
4905 {
4906 struct ext4_features *ef;
4907 int ret = -ENOMEM;
4908
4909 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4910 if (!ef)
4911 goto out;
4912
4913 ef->f_kobj.kset = ext4_kset;
4914 init_completion(&ef->f_kobj_unregister);
4915 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4916 "features");
4917 if (ret) {
4918 kfree(ef);
4919 goto out;
4920 }
4921
4922 ext4_feat = ef;
4923 ret = 0;
4924 out:
4925 return ret;
4926 }
4927
4928 static void ext4_exit_feat_adverts(void)
4929 {
4930 kobject_put(&ext4_feat->f_kobj);
4931 wait_for_completion(&ext4_feat->f_kobj_unregister);
4932 kfree(ext4_feat);
4933 }
4934
4935 /* Shared across all ext4 file systems */
4936 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4937 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4938
4939 static int __init ext4_init_fs(void)
4940 {
4941 int i, err;
4942
4943 ext4_check_flag_values();
4944
4945 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4946 mutex_init(&ext4__aio_mutex[i]);
4947 init_waitqueue_head(&ext4__ioend_wq[i]);
4948 }
4949
4950 err = ext4_init_pageio();
4951 if (err)
4952 return err;
4953 err = ext4_init_system_zone();
4954 if (err)
4955 goto out7;
4956 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4957 if (!ext4_kset)
4958 goto out6;
4959 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4960 if (!ext4_proc_root)
4961 goto out5;
4962
4963 err = ext4_init_feat_adverts();
4964 if (err)
4965 goto out4;
4966
4967 err = ext4_init_mballoc();
4968 if (err)
4969 goto out3;
4970
4971 err = ext4_init_xattr();
4972 if (err)
4973 goto out2;
4974 err = init_inodecache();
4975 if (err)
4976 goto out1;
4977 register_as_ext3();
4978 register_as_ext2();
4979 err = register_filesystem(&ext4_fs_type);
4980 if (err)
4981 goto out;
4982
4983 ext4_li_info = NULL;
4984 mutex_init(&ext4_li_mtx);
4985 return 0;
4986 out:
4987 unregister_as_ext2();
4988 unregister_as_ext3();
4989 destroy_inodecache();
4990 out1:
4991 ext4_exit_xattr();
4992 out2:
4993 ext4_exit_mballoc();
4994 out3:
4995 ext4_exit_feat_adverts();
4996 out4:
4997 remove_proc_entry("fs/ext4", NULL);
4998 out5:
4999 kset_unregister(ext4_kset);
5000 out6:
5001 ext4_exit_system_zone();
5002 out7:
5003 ext4_exit_pageio();
5004 return err;
5005 }
5006
5007 static void __exit ext4_exit_fs(void)
5008 {
5009 ext4_destroy_lazyinit_thread();
5010 unregister_as_ext2();
5011 unregister_as_ext3();
5012 unregister_filesystem(&ext4_fs_type);
5013 destroy_inodecache();
5014 ext4_exit_xattr();
5015 ext4_exit_mballoc();
5016 ext4_exit_feat_adverts();
5017 remove_proc_entry("fs/ext4", NULL);
5018 kset_unregister(ext4_kset);
5019 ext4_exit_system_zone();
5020 ext4_exit_pageio();
5021 }
5022
5023 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5024 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5025 MODULE_LICENSE("GPL");
5026 module_init(ext4_init_fs)
5027 module_exit(ext4_exit_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree