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ext4: ignore mount options supported by ext2/3 (but have since been removed)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / super.c
blob960681fae64e59af75d6adf655fc544f2aad9754
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_extents.h"
49 #include "ext4_jbd2.h"
50 #include "xattr.h"
51 #include "acl.h"
52 #include "mballoc.h"
53
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
56
57 static struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
59 static struct ext4_lazy_init *ext4_li_info;
60 static struct mutex ext4_li_mtx;
61 static struct ext4_features *ext4_feat;
62
63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 unsigned long journal_devnum);
65 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66 static int ext4_commit_super(struct super_block *sb, int sync);
67 static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69 static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
71 static int ext4_sync_fs(struct super_block *sb, int wait);
72 static const char *ext4_decode_error(struct super_block *sb, int errno,
73 char nbuf[16]);
74 static int ext4_remount(struct super_block *sb, int *flags, char *data);
75 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76 static int ext4_unfreeze(struct super_block *sb);
77 static void ext4_write_super(struct super_block *sb);
78 static int ext4_freeze(struct super_block *sb);
79 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
81 static inline int ext2_feature_set_ok(struct super_block *sb);
82 static inline int ext3_feature_set_ok(struct super_block *sb);
83 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
84 static void ext4_destroy_lazyinit_thread(void);
85 static void ext4_unregister_li_request(struct super_block *sb);
86 static void ext4_clear_request_list(void);
87
88 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89 static struct file_system_type ext2_fs_type = {
90 .owner = THIS_MODULE,
91 .name = "ext2",
92 .mount = ext4_mount,
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
95 };
96 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97 #else
98 #define IS_EXT2_SB(sb) (0)
99 #endif
100
101
102 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103 static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
106 .mount = ext4_mount,
107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109 };
110 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111 #else
112 #define IS_EXT3_SB(sb) (0)
113 #endif
114
115 void *ext4_kvmalloc(size_t size, gfp_t flags)
116 {
117 void *ret;
118
119 ret = kmalloc(size, flags);
120 if (!ret)
121 ret = __vmalloc(size, flags, PAGE_KERNEL);
122 return ret;
123 }
124
125 void *ext4_kvzalloc(size_t size, gfp_t flags)
126 {
127 void *ret;
128
129 ret = kzalloc(size, flags);
130 if (!ret)
131 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
132 return ret;
133 }
134
135 void ext4_kvfree(void *ptr)
136 {
137 if (is_vmalloc_addr(ptr))
138 vfree(ptr);
139 else
140 kfree(ptr);
141
142 }
143
144 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
145 struct ext4_group_desc *bg)
146 {
147 return le32_to_cpu(bg->bg_block_bitmap_lo) |
148 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
149 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
150 }
151
152 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
153 struct ext4_group_desc *bg)
154 {
155 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
156 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
157 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
158 }
159
160 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
161 struct ext4_group_desc *bg)
162 {
163 return le32_to_cpu(bg->bg_inode_table_lo) |
164 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
165 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
166 }
167
168 __u32 ext4_free_group_clusters(struct super_block *sb,
169 struct ext4_group_desc *bg)
170 {
171 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
172 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
173 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
174 }
175
176 __u32 ext4_free_inodes_count(struct super_block *sb,
177 struct ext4_group_desc *bg)
178 {
179 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
180 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
181 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
182 }
183
184 __u32 ext4_used_dirs_count(struct super_block *sb,
185 struct ext4_group_desc *bg)
186 {
187 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
188 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
189 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
190 }
191
192 __u32 ext4_itable_unused_count(struct super_block *sb,
193 struct ext4_group_desc *bg)
194 {
195 return le16_to_cpu(bg->bg_itable_unused_lo) |
196 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
197 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
198 }
199
200 void ext4_block_bitmap_set(struct super_block *sb,
201 struct ext4_group_desc *bg, ext4_fsblk_t blk)
202 {
203 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
204 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
205 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
206 }
207
208 void ext4_inode_bitmap_set(struct super_block *sb,
209 struct ext4_group_desc *bg, ext4_fsblk_t blk)
210 {
211 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
212 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
213 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
214 }
215
216 void ext4_inode_table_set(struct super_block *sb,
217 struct ext4_group_desc *bg, ext4_fsblk_t blk)
218 {
219 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
220 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
221 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
222 }
223
224 void ext4_free_group_clusters_set(struct super_block *sb,
225 struct ext4_group_desc *bg, __u32 count)
226 {
227 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
228 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
229 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
230 }
231
232 void ext4_free_inodes_set(struct super_block *sb,
233 struct ext4_group_desc *bg, __u32 count)
234 {
235 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
236 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
237 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
238 }
239
240 void ext4_used_dirs_set(struct super_block *sb,
241 struct ext4_group_desc *bg, __u32 count)
242 {
243 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
244 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
245 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
246 }
247
248 void ext4_itable_unused_set(struct super_block *sb,
249 struct ext4_group_desc *bg, __u32 count)
250 {
251 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
252 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
253 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
254 }
255
256
257 /* Just increment the non-pointer handle value */
258 static handle_t *ext4_get_nojournal(void)
259 {
260 handle_t *handle = current->journal_info;
261 unsigned long ref_cnt = (unsigned long)handle;
262
263 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
264
265 ref_cnt++;
266 handle = (handle_t *)ref_cnt;
267
268 current->journal_info = handle;
269 return handle;
270 }
271
272
273 /* Decrement the non-pointer handle value */
274 static void ext4_put_nojournal(handle_t *handle)
275 {
276 unsigned long ref_cnt = (unsigned long)handle;
277
278 BUG_ON(ref_cnt == 0);
279
280 ref_cnt--;
281 handle = (handle_t *)ref_cnt;
282
283 current->journal_info = handle;
284 }
285
286 /*
287 * Wrappers for jbd2_journal_start/end.
288 *
289 * The only special thing we need to do here is to make sure that all
290 * journal_end calls result in the superblock being marked dirty, so
291 * that sync() will call the filesystem's write_super callback if
292 * appropriate.
293 *
294 * To avoid j_barrier hold in userspace when a user calls freeze(),
295 * ext4 prevents a new handle from being started by s_frozen, which
296 * is in an upper layer.
297 */
298 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
299 {
300 journal_t *journal;
301 handle_t *handle;
302
303 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
304 if (sb->s_flags & MS_RDONLY)
305 return ERR_PTR(-EROFS);
306
307 journal = EXT4_SB(sb)->s_journal;
308 handle = ext4_journal_current_handle();
309
310 /*
311 * If a handle has been started, it should be allowed to
312 * finish, otherwise deadlock could happen between freeze
313 * and others(e.g. truncate) due to the restart of the
314 * journal handle if the filesystem is forzen and active
315 * handles are not stopped.
316 */
317 if (!handle)
318 vfs_check_frozen(sb, SB_FREEZE_TRANS);
319
320 if (!journal)
321 return ext4_get_nojournal();
322 /*
323 * Special case here: if the journal has aborted behind our
324 * backs (eg. EIO in the commit thread), then we still need to
325 * take the FS itself readonly cleanly.
326 */
327 if (is_journal_aborted(journal)) {
328 ext4_abort(sb, "Detected aborted journal");
329 return ERR_PTR(-EROFS);
330 }
331 return jbd2_journal_start(journal, nblocks);
332 }
333
334 /*
335 * The only special thing we need to do here is to make sure that all
336 * jbd2_journal_stop calls result in the superblock being marked dirty, so
337 * that sync() will call the filesystem's write_super callback if
338 * appropriate.
339 */
340 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
341 {
342 struct super_block *sb;
343 int err;
344 int rc;
345
346 if (!ext4_handle_valid(handle)) {
347 ext4_put_nojournal(handle);
348 return 0;
349 }
350 sb = handle->h_transaction->t_journal->j_private;
351 err = handle->h_err;
352 rc = jbd2_journal_stop(handle);
353
354 if (!err)
355 err = rc;
356 if (err)
357 __ext4_std_error(sb, where, line, err);
358 return err;
359 }
360
361 void ext4_journal_abort_handle(const char *caller, unsigned int line,
362 const char *err_fn, struct buffer_head *bh,
363 handle_t *handle, int err)
364 {
365 char nbuf[16];
366 const char *errstr = ext4_decode_error(NULL, err, nbuf);
367
368 BUG_ON(!ext4_handle_valid(handle));
369
370 if (bh)
371 BUFFER_TRACE(bh, "abort");
372
373 if (!handle->h_err)
374 handle->h_err = err;
375
376 if (is_handle_aborted(handle))
377 return;
378
379 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
380 caller, line, errstr, err_fn);
381
382 jbd2_journal_abort_handle(handle);
383 }
384
385 static void __save_error_info(struct super_block *sb, const char *func,
386 unsigned int line)
387 {
388 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
389
390 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
391 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
392 es->s_last_error_time = cpu_to_le32(get_seconds());
393 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
394 es->s_last_error_line = cpu_to_le32(line);
395 if (!es->s_first_error_time) {
396 es->s_first_error_time = es->s_last_error_time;
397 strncpy(es->s_first_error_func, func,
398 sizeof(es->s_first_error_func));
399 es->s_first_error_line = cpu_to_le32(line);
400 es->s_first_error_ino = es->s_last_error_ino;
401 es->s_first_error_block = es->s_last_error_block;
402 }
403 /*
404 * Start the daily error reporting function if it hasn't been
405 * started already
406 */
407 if (!es->s_error_count)
408 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
409 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
410 }
411
412 static void save_error_info(struct super_block *sb, const char *func,
413 unsigned int line)
414 {
415 __save_error_info(sb, func, line);
416 ext4_commit_super(sb, 1);
417 }
418
419 /*
420 * The del_gendisk() function uninitializes the disk-specific data
421 * structures, including the bdi structure, without telling anyone
422 * else. Once this happens, any attempt to call mark_buffer_dirty()
423 * (for example, by ext4_commit_super), will cause a kernel OOPS.
424 * This is a kludge to prevent these oops until we can put in a proper
425 * hook in del_gendisk() to inform the VFS and file system layers.
426 */
427 static int block_device_ejected(struct super_block *sb)
428 {
429 struct inode *bd_inode = sb->s_bdev->bd_inode;
430 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
431
432 return bdi->dev == NULL;
433 }
434
435 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
436 {
437 struct super_block *sb = journal->j_private;
438 struct ext4_sb_info *sbi = EXT4_SB(sb);
439 int error = is_journal_aborted(journal);
440 struct ext4_journal_cb_entry *jce, *tmp;
441
442 spin_lock(&sbi->s_md_lock);
443 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
444 list_del_init(&jce->jce_list);
445 spin_unlock(&sbi->s_md_lock);
446 jce->jce_func(sb, jce, error);
447 spin_lock(&sbi->s_md_lock);
448 }
449 spin_unlock(&sbi->s_md_lock);
450 }
451
452 /* Deal with the reporting of failure conditions on a filesystem such as
453 * inconsistencies detected or read IO failures.
454 *
455 * On ext2, we can store the error state of the filesystem in the
456 * superblock. That is not possible on ext4, because we may have other
457 * write ordering constraints on the superblock which prevent us from
458 * writing it out straight away; and given that the journal is about to
459 * be aborted, we can't rely on the current, or future, transactions to
460 * write out the superblock safely.
461 *
462 * We'll just use the jbd2_journal_abort() error code to record an error in
463 * the journal instead. On recovery, the journal will complain about
464 * that error until we've noted it down and cleared it.
465 */
466
467 static void ext4_handle_error(struct super_block *sb)
468 {
469 if (sb->s_flags & MS_RDONLY)
470 return;
471
472 if (!test_opt(sb, ERRORS_CONT)) {
473 journal_t *journal = EXT4_SB(sb)->s_journal;
474
475 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
476 if (journal)
477 jbd2_journal_abort(journal, -EIO);
478 }
479 if (test_opt(sb, ERRORS_RO)) {
480 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
481 sb->s_flags |= MS_RDONLY;
482 }
483 if (test_opt(sb, ERRORS_PANIC))
484 panic("EXT4-fs (device %s): panic forced after error\n",
485 sb->s_id);
486 }
487
488 void __ext4_error(struct super_block *sb, const char *function,
489 unsigned int line, const char *fmt, ...)
490 {
491 struct va_format vaf;
492 va_list args;
493
494 va_start(args, fmt);
495 vaf.fmt = fmt;
496 vaf.va = &args;
497 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
498 sb->s_id, function, line, current->comm, &vaf);
499 va_end(args);
500
501 ext4_handle_error(sb);
502 }
503
504 void ext4_error_inode(struct inode *inode, const char *function,
505 unsigned int line, ext4_fsblk_t block,
506 const char *fmt, ...)
507 {
508 va_list args;
509 struct va_format vaf;
510 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
511
512 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
513 es->s_last_error_block = cpu_to_le64(block);
514 save_error_info(inode->i_sb, function, line);
515 va_start(args, fmt);
516 vaf.fmt = fmt;
517 vaf.va = &args;
518 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
519 inode->i_sb->s_id, function, line, inode->i_ino);
520 if (block)
521 printk(KERN_CONT "block %llu: ", block);
522 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
523 va_end(args);
524
525 ext4_handle_error(inode->i_sb);
526 }
527
528 void ext4_error_file(struct file *file, const char *function,
529 unsigned int line, ext4_fsblk_t block,
530 const char *fmt, ...)
531 {
532 va_list args;
533 struct va_format vaf;
534 struct ext4_super_block *es;
535 struct inode *inode = file->f_dentry->d_inode;
536 char pathname[80], *path;
537
538 es = EXT4_SB(inode->i_sb)->s_es;
539 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
540 save_error_info(inode->i_sb, function, line);
541 path = d_path(&(file->f_path), pathname, sizeof(pathname));
542 if (IS_ERR(path))
543 path = "(unknown)";
544 printk(KERN_CRIT
545 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
546 inode->i_sb->s_id, function, line, inode->i_ino);
547 if (block)
548 printk(KERN_CONT "block %llu: ", block);
549 va_start(args, fmt);
550 vaf.fmt = fmt;
551 vaf.va = &args;
552 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
553 va_end(args);
554
555 ext4_handle_error(inode->i_sb);
556 }
557
558 static const char *ext4_decode_error(struct super_block *sb, int errno,
559 char nbuf[16])
560 {
561 char *errstr = NULL;
562
563 switch (errno) {
564 case -EIO:
565 errstr = "IO failure";
566 break;
567 case -ENOMEM:
568 errstr = "Out of memory";
569 break;
570 case -EROFS:
571 if (!sb || (EXT4_SB(sb)->s_journal &&
572 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
573 errstr = "Journal has aborted";
574 else
575 errstr = "Readonly filesystem";
576 break;
577 default:
578 /* If the caller passed in an extra buffer for unknown
579 * errors, textualise them now. Else we just return
580 * NULL. */
581 if (nbuf) {
582 /* Check for truncated error codes... */
583 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
584 errstr = nbuf;
585 }
586 break;
587 }
588
589 return errstr;
590 }
591
592 /* __ext4_std_error decodes expected errors from journaling functions
593 * automatically and invokes the appropriate error response. */
594
595 void __ext4_std_error(struct super_block *sb, const char *function,
596 unsigned int line, int errno)
597 {
598 char nbuf[16];
599 const char *errstr;
600
601 /* Special case: if the error is EROFS, and we're not already
602 * inside a transaction, then there's really no point in logging
603 * an error. */
604 if (errno == -EROFS && journal_current_handle() == NULL &&
605 (sb->s_flags & MS_RDONLY))
606 return;
607
608 errstr = ext4_decode_error(sb, errno, nbuf);
609 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
610 sb->s_id, function, line, errstr);
611 save_error_info(sb, function, line);
612
613 ext4_handle_error(sb);
614 }
615
616 /*
617 * ext4_abort is a much stronger failure handler than ext4_error. The
618 * abort function may be used to deal with unrecoverable failures such
619 * as journal IO errors or ENOMEM at a critical moment in log management.
620 *
621 * We unconditionally force the filesystem into an ABORT|READONLY state,
622 * unless the error response on the fs has been set to panic in which
623 * case we take the easy way out and panic immediately.
624 */
625
626 void __ext4_abort(struct super_block *sb, const char *function,
627 unsigned int line, const char *fmt, ...)
628 {
629 va_list args;
630
631 save_error_info(sb, function, line);
632 va_start(args, fmt);
633 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
634 function, line);
635 vprintk(fmt, args);
636 printk("\n");
637 va_end(args);
638
639 if ((sb->s_flags & MS_RDONLY) == 0) {
640 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
641 sb->s_flags |= MS_RDONLY;
642 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
643 if (EXT4_SB(sb)->s_journal)
644 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
645 save_error_info(sb, function, line);
646 }
647 if (test_opt(sb, ERRORS_PANIC))
648 panic("EXT4-fs panic from previous error\n");
649 }
650
651 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
652 {
653 struct va_format vaf;
654 va_list args;
655
656 va_start(args, fmt);
657 vaf.fmt = fmt;
658 vaf.va = &args;
659 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
660 va_end(args);
661 }
662
663 void __ext4_warning(struct super_block *sb, const char *function,
664 unsigned int line, const char *fmt, ...)
665 {
666 struct va_format vaf;
667 va_list args;
668
669 va_start(args, fmt);
670 vaf.fmt = fmt;
671 vaf.va = &args;
672 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
673 sb->s_id, function, line, &vaf);
674 va_end(args);
675 }
676
677 void __ext4_grp_locked_error(const char *function, unsigned int line,
678 struct super_block *sb, ext4_group_t grp,
679 unsigned long ino, ext4_fsblk_t block,
680 const char *fmt, ...)
681 __releases(bitlock)
682 __acquires(bitlock)
683 {
684 struct va_format vaf;
685 va_list args;
686 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
687
688 es->s_last_error_ino = cpu_to_le32(ino);
689 es->s_last_error_block = cpu_to_le64(block);
690 __save_error_info(sb, function, line);
691
692 va_start(args, fmt);
693
694 vaf.fmt = fmt;
695 vaf.va = &args;
696 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
697 sb->s_id, function, line, grp);
698 if (ino)
699 printk(KERN_CONT "inode %lu: ", ino);
700 if (block)
701 printk(KERN_CONT "block %llu:", (unsigned long long) block);
702 printk(KERN_CONT "%pV\n", &vaf);
703 va_end(args);
704
705 if (test_opt(sb, ERRORS_CONT)) {
706 ext4_commit_super(sb, 0);
707 return;
708 }
709
710 ext4_unlock_group(sb, grp);
711 ext4_handle_error(sb);
712 /*
713 * We only get here in the ERRORS_RO case; relocking the group
714 * may be dangerous, but nothing bad will happen since the
715 * filesystem will have already been marked read/only and the
716 * journal has been aborted. We return 1 as a hint to callers
717 * who might what to use the return value from
718 * ext4_grp_locked_error() to distinguish between the
719 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
720 * aggressively from the ext4 function in question, with a
721 * more appropriate error code.
722 */
723 ext4_lock_group(sb, grp);
724 return;
725 }
726
727 void ext4_update_dynamic_rev(struct super_block *sb)
728 {
729 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
730
731 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
732 return;
733
734 ext4_warning(sb,
735 "updating to rev %d because of new feature flag, "
736 "running e2fsck is recommended",
737 EXT4_DYNAMIC_REV);
738
739 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
740 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
741 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
742 /* leave es->s_feature_*compat flags alone */
743 /* es->s_uuid will be set by e2fsck if empty */
744
745 /*
746 * The rest of the superblock fields should be zero, and if not it
747 * means they are likely already in use, so leave them alone. We
748 * can leave it up to e2fsck to clean up any inconsistencies there.
749 */
750 }
751
752 /*
753 * Open the external journal device
754 */
755 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
756 {
757 struct block_device *bdev;
758 char b[BDEVNAME_SIZE];
759
760 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
761 if (IS_ERR(bdev))
762 goto fail;
763 return bdev;
764
765 fail:
766 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
767 __bdevname(dev, b), PTR_ERR(bdev));
768 return NULL;
769 }
770
771 /*
772 * Release the journal device
773 */
774 static int ext4_blkdev_put(struct block_device *bdev)
775 {
776 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
777 }
778
779 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
780 {
781 struct block_device *bdev;
782 int ret = -ENODEV;
783
784 bdev = sbi->journal_bdev;
785 if (bdev) {
786 ret = ext4_blkdev_put(bdev);
787 sbi->journal_bdev = NULL;
788 }
789 return ret;
790 }
791
792 static inline struct inode *orphan_list_entry(struct list_head *l)
793 {
794 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
795 }
796
797 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
798 {
799 struct list_head *l;
800
801 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
802 le32_to_cpu(sbi->s_es->s_last_orphan));
803
804 printk(KERN_ERR "sb_info orphan list:\n");
805 list_for_each(l, &sbi->s_orphan) {
806 struct inode *inode = orphan_list_entry(l);
807 printk(KERN_ERR " "
808 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
809 inode->i_sb->s_id, inode->i_ino, inode,
810 inode->i_mode, inode->i_nlink,
811 NEXT_ORPHAN(inode));
812 }
813 }
814
815 static void ext4_put_super(struct super_block *sb)
816 {
817 struct ext4_sb_info *sbi = EXT4_SB(sb);
818 struct ext4_super_block *es = sbi->s_es;
819 int i, err;
820
821 ext4_unregister_li_request(sb);
822 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
823
824 flush_workqueue(sbi->dio_unwritten_wq);
825 destroy_workqueue(sbi->dio_unwritten_wq);
826
827 lock_super(sb);
828 if (sb->s_dirt)
829 ext4_commit_super(sb, 1);
830
831 if (sbi->s_journal) {
832 err = jbd2_journal_destroy(sbi->s_journal);
833 sbi->s_journal = NULL;
834 if (err < 0)
835 ext4_abort(sb, "Couldn't clean up the journal");
836 }
837
838 del_timer(&sbi->s_err_report);
839 ext4_release_system_zone(sb);
840 ext4_mb_release(sb);
841 ext4_ext_release(sb);
842 ext4_xattr_put_super(sb);
843
844 if (!(sb->s_flags & MS_RDONLY)) {
845 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
846 es->s_state = cpu_to_le16(sbi->s_mount_state);
847 ext4_commit_super(sb, 1);
848 }
849 if (sbi->s_proc) {
850 remove_proc_entry("options", sbi->s_proc);
851 remove_proc_entry(sb->s_id, ext4_proc_root);
852 }
853 kobject_del(&sbi->s_kobj);
854
855 for (i = 0; i < sbi->s_gdb_count; i++)
856 brelse(sbi->s_group_desc[i]);
857 ext4_kvfree(sbi->s_group_desc);
858 ext4_kvfree(sbi->s_flex_groups);
859 percpu_counter_destroy(&sbi->s_freeclusters_counter);
860 percpu_counter_destroy(&sbi->s_freeinodes_counter);
861 percpu_counter_destroy(&sbi->s_dirs_counter);
862 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
863 brelse(sbi->s_sbh);
864 #ifdef CONFIG_QUOTA
865 for (i = 0; i < MAXQUOTAS; i++)
866 kfree(sbi->s_qf_names[i]);
867 #endif
868
869 /* Debugging code just in case the in-memory inode orphan list
870 * isn't empty. The on-disk one can be non-empty if we've
871 * detected an error and taken the fs readonly, but the
872 * in-memory list had better be clean by this point. */
873 if (!list_empty(&sbi->s_orphan))
874 dump_orphan_list(sb, sbi);
875 J_ASSERT(list_empty(&sbi->s_orphan));
876
877 invalidate_bdev(sb->s_bdev);
878 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
879 /*
880 * Invalidate the journal device's buffers. We don't want them
881 * floating about in memory - the physical journal device may
882 * hotswapped, and it breaks the `ro-after' testing code.
883 */
884 sync_blockdev(sbi->journal_bdev);
885 invalidate_bdev(sbi->journal_bdev);
886 ext4_blkdev_remove(sbi);
887 }
888 if (sbi->s_mmp_tsk)
889 kthread_stop(sbi->s_mmp_tsk);
890 sb->s_fs_info = NULL;
891 /*
892 * Now that we are completely done shutting down the
893 * superblock, we need to actually destroy the kobject.
894 */
895 unlock_super(sb);
896 kobject_put(&sbi->s_kobj);
897 wait_for_completion(&sbi->s_kobj_unregister);
898 kfree(sbi->s_blockgroup_lock);
899 kfree(sbi);
900 }
901
902 static struct kmem_cache *ext4_inode_cachep;
903
904 /*
905 * Called inside transaction, so use GFP_NOFS
906 */
907 static struct inode *ext4_alloc_inode(struct super_block *sb)
908 {
909 struct ext4_inode_info *ei;
910
911 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
912 if (!ei)
913 return NULL;
914
915 ei->vfs_inode.i_version = 1;
916 ei->vfs_inode.i_data.writeback_index = 0;
917 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
918 INIT_LIST_HEAD(&ei->i_prealloc_list);
919 spin_lock_init(&ei->i_prealloc_lock);
920 ei->i_reserved_data_blocks = 0;
921 ei->i_reserved_meta_blocks = 0;
922 ei->i_allocated_meta_blocks = 0;
923 ei->i_da_metadata_calc_len = 0;
924 spin_lock_init(&(ei->i_block_reservation_lock));
925 #ifdef CONFIG_QUOTA
926 ei->i_reserved_quota = 0;
927 #endif
928 ei->jinode = NULL;
929 INIT_LIST_HEAD(&ei->i_completed_io_list);
930 spin_lock_init(&ei->i_completed_io_lock);
931 ei->cur_aio_dio = NULL;
932 ei->i_sync_tid = 0;
933 ei->i_datasync_tid = 0;
934 atomic_set(&ei->i_ioend_count, 0);
935 atomic_set(&ei->i_aiodio_unwritten, 0);
936
937 return &ei->vfs_inode;
938 }
939
940 static int ext4_drop_inode(struct inode *inode)
941 {
942 int drop = generic_drop_inode(inode);
943
944 trace_ext4_drop_inode(inode, drop);
945 return drop;
946 }
947
948 static void ext4_i_callback(struct rcu_head *head)
949 {
950 struct inode *inode = container_of(head, struct inode, i_rcu);
951 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
952 }
953
954 static void ext4_destroy_inode(struct inode *inode)
955 {
956 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
957 ext4_msg(inode->i_sb, KERN_ERR,
958 "Inode %lu (%p): orphan list check failed!",
959 inode->i_ino, EXT4_I(inode));
960 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
961 EXT4_I(inode), sizeof(struct ext4_inode_info),
962 true);
963 dump_stack();
964 }
965 call_rcu(&inode->i_rcu, ext4_i_callback);
966 }
967
968 static void init_once(void *foo)
969 {
970 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
971
972 INIT_LIST_HEAD(&ei->i_orphan);
973 #ifdef CONFIG_EXT4_FS_XATTR
974 init_rwsem(&ei->xattr_sem);
975 #endif
976 init_rwsem(&ei->i_data_sem);
977 inode_init_once(&ei->vfs_inode);
978 }
979
980 static int init_inodecache(void)
981 {
982 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
983 sizeof(struct ext4_inode_info),
984 0, (SLAB_RECLAIM_ACCOUNT|
985 SLAB_MEM_SPREAD),
986 init_once);
987 if (ext4_inode_cachep == NULL)
988 return -ENOMEM;
989 return 0;
990 }
991
992 static void destroy_inodecache(void)
993 {
994 kmem_cache_destroy(ext4_inode_cachep);
995 }
996
997 void ext4_clear_inode(struct inode *inode)
998 {
999 invalidate_inode_buffers(inode);
1000 end_writeback(inode);
1001 dquot_drop(inode);
1002 ext4_discard_preallocations(inode);
1003 if (EXT4_I(inode)->jinode) {
1004 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1005 EXT4_I(inode)->jinode);
1006 jbd2_free_inode(EXT4_I(inode)->jinode);
1007 EXT4_I(inode)->jinode = NULL;
1008 }
1009 }
1010
1011 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1012 u64 ino, u32 generation)
1013 {
1014 struct inode *inode;
1015
1016 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1017 return ERR_PTR(-ESTALE);
1018 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1019 return ERR_PTR(-ESTALE);
1020
1021 /* iget isn't really right if the inode is currently unallocated!!
1022 *
1023 * ext4_read_inode will return a bad_inode if the inode had been
1024 * deleted, so we should be safe.
1025 *
1026 * Currently we don't know the generation for parent directory, so
1027 * a generation of 0 means "accept any"
1028 */
1029 inode = ext4_iget(sb, ino);
1030 if (IS_ERR(inode))
1031 return ERR_CAST(inode);
1032 if (generation && inode->i_generation != generation) {
1033 iput(inode);
1034 return ERR_PTR(-ESTALE);
1035 }
1036
1037 return inode;
1038 }
1039
1040 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1041 int fh_len, int fh_type)
1042 {
1043 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1044 ext4_nfs_get_inode);
1045 }
1046
1047 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1048 int fh_len, int fh_type)
1049 {
1050 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1051 ext4_nfs_get_inode);
1052 }
1053
1054 /*
1055 * Try to release metadata pages (indirect blocks, directories) which are
1056 * mapped via the block device. Since these pages could have journal heads
1057 * which would prevent try_to_free_buffers() from freeing them, we must use
1058 * jbd2 layer's try_to_free_buffers() function to release them.
1059 */
1060 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1061 gfp_t wait)
1062 {
1063 journal_t *journal = EXT4_SB(sb)->s_journal;
1064
1065 WARN_ON(PageChecked(page));
1066 if (!page_has_buffers(page))
1067 return 0;
1068 if (journal)
1069 return jbd2_journal_try_to_free_buffers(journal, page,
1070 wait & ~__GFP_WAIT);
1071 return try_to_free_buffers(page);
1072 }
1073
1074 #ifdef CONFIG_QUOTA
1075 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1076 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1077
1078 static int ext4_write_dquot(struct dquot *dquot);
1079 static int ext4_acquire_dquot(struct dquot *dquot);
1080 static int ext4_release_dquot(struct dquot *dquot);
1081 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1082 static int ext4_write_info(struct super_block *sb, int type);
1083 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1084 struct path *path);
1085 static int ext4_quota_off(struct super_block *sb, int type);
1086 static int ext4_quota_on_mount(struct super_block *sb, int type);
1087 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1088 size_t len, loff_t off);
1089 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1090 const char *data, size_t len, loff_t off);
1091
1092 static const struct dquot_operations ext4_quota_operations = {
1093 .get_reserved_space = ext4_get_reserved_space,
1094 .write_dquot = ext4_write_dquot,
1095 .acquire_dquot = ext4_acquire_dquot,
1096 .release_dquot = ext4_release_dquot,
1097 .mark_dirty = ext4_mark_dquot_dirty,
1098 .write_info = ext4_write_info,
1099 .alloc_dquot = dquot_alloc,
1100 .destroy_dquot = dquot_destroy,
1101 };
1102
1103 static const struct quotactl_ops ext4_qctl_operations = {
1104 .quota_on = ext4_quota_on,
1105 .quota_off = ext4_quota_off,
1106 .quota_sync = dquot_quota_sync,
1107 .get_info = dquot_get_dqinfo,
1108 .set_info = dquot_set_dqinfo,
1109 .get_dqblk = dquot_get_dqblk,
1110 .set_dqblk = dquot_set_dqblk
1111 };
1112 #endif
1113
1114 static const struct super_operations ext4_sops = {
1115 .alloc_inode = ext4_alloc_inode,
1116 .destroy_inode = ext4_destroy_inode,
1117 .write_inode = ext4_write_inode,
1118 .dirty_inode = ext4_dirty_inode,
1119 .drop_inode = ext4_drop_inode,
1120 .evict_inode = ext4_evict_inode,
1121 .put_super = ext4_put_super,
1122 .sync_fs = ext4_sync_fs,
1123 .freeze_fs = ext4_freeze,
1124 .unfreeze_fs = ext4_unfreeze,
1125 .statfs = ext4_statfs,
1126 .remount_fs = ext4_remount,
1127 .show_options = ext4_show_options,
1128 #ifdef CONFIG_QUOTA
1129 .quota_read = ext4_quota_read,
1130 .quota_write = ext4_quota_write,
1131 #endif
1132 .bdev_try_to_free_page = bdev_try_to_free_page,
1133 };
1134
1135 static const struct super_operations ext4_nojournal_sops = {
1136 .alloc_inode = ext4_alloc_inode,
1137 .destroy_inode = ext4_destroy_inode,
1138 .write_inode = ext4_write_inode,
1139 .dirty_inode = ext4_dirty_inode,
1140 .drop_inode = ext4_drop_inode,
1141 .evict_inode = ext4_evict_inode,
1142 .write_super = ext4_write_super,
1143 .put_super = ext4_put_super,
1144 .statfs = ext4_statfs,
1145 .remount_fs = ext4_remount,
1146 .show_options = ext4_show_options,
1147 #ifdef CONFIG_QUOTA
1148 .quota_read = ext4_quota_read,
1149 .quota_write = ext4_quota_write,
1150 #endif
1151 .bdev_try_to_free_page = bdev_try_to_free_page,
1152 };
1153
1154 static const struct export_operations ext4_export_ops = {
1155 .fh_to_dentry = ext4_fh_to_dentry,
1156 .fh_to_parent = ext4_fh_to_parent,
1157 .get_parent = ext4_get_parent,
1158 };
1159
1160 enum {
1161 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1162 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1163 Opt_nouid32, Opt_debug, Opt_removed,
1164 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1165 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1166 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1167 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1168 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1169 Opt_data_err_abort, Opt_data_err_ignore,
1170 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1171 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1172 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1173 Opt_usrquota, Opt_grpquota, Opt_i_version,
1174 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1175 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1176 Opt_inode_readahead_blks, Opt_journal_ioprio,
1177 Opt_dioread_nolock, Opt_dioread_lock,
1178 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1179 };
1180
1181 static const match_table_t tokens = {
1182 {Opt_bsd_df, "bsddf"},
1183 {Opt_minix_df, "minixdf"},
1184 {Opt_grpid, "grpid"},
1185 {Opt_grpid, "bsdgroups"},
1186 {Opt_nogrpid, "nogrpid"},
1187 {Opt_nogrpid, "sysvgroups"},
1188 {Opt_resgid, "resgid=%u"},
1189 {Opt_resuid, "resuid=%u"},
1190 {Opt_sb, "sb=%u"},
1191 {Opt_err_cont, "errors=continue"},
1192 {Opt_err_panic, "errors=panic"},
1193 {Opt_err_ro, "errors=remount-ro"},
1194 {Opt_nouid32, "nouid32"},
1195 {Opt_debug, "debug"},
1196 {Opt_removed, "oldalloc"},
1197 {Opt_removed, "orlov"},
1198 {Opt_user_xattr, "user_xattr"},
1199 {Opt_nouser_xattr, "nouser_xattr"},
1200 {Opt_acl, "acl"},
1201 {Opt_noacl, "noacl"},
1202 {Opt_noload, "norecovery"},
1203 {Opt_noload, "noload"},
1204 {Opt_removed, "nobh"},
1205 {Opt_removed, "bh"},
1206 {Opt_commit, "commit=%u"},
1207 {Opt_min_batch_time, "min_batch_time=%u"},
1208 {Opt_max_batch_time, "max_batch_time=%u"},
1209 {Opt_journal_dev, "journal_dev=%u"},
1210 {Opt_journal_checksum, "journal_checksum"},
1211 {Opt_journal_async_commit, "journal_async_commit"},
1212 {Opt_abort, "abort"},
1213 {Opt_data_journal, "data=journal"},
1214 {Opt_data_ordered, "data=ordered"},
1215 {Opt_data_writeback, "data=writeback"},
1216 {Opt_data_err_abort, "data_err=abort"},
1217 {Opt_data_err_ignore, "data_err=ignore"},
1218 {Opt_offusrjquota, "usrjquota="},
1219 {Opt_usrjquota, "usrjquota=%s"},
1220 {Opt_offgrpjquota, "grpjquota="},
1221 {Opt_grpjquota, "grpjquota=%s"},
1222 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1223 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1224 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1225 {Opt_grpquota, "grpquota"},
1226 {Opt_noquota, "noquota"},
1227 {Opt_quota, "quota"},
1228 {Opt_usrquota, "usrquota"},
1229 {Opt_barrier, "barrier=%u"},
1230 {Opt_barrier, "barrier"},
1231 {Opt_nobarrier, "nobarrier"},
1232 {Opt_i_version, "i_version"},
1233 {Opt_stripe, "stripe=%u"},
1234 {Opt_delalloc, "delalloc"},
1235 {Opt_nodelalloc, "nodelalloc"},
1236 {Opt_mblk_io_submit, "mblk_io_submit"},
1237 {Opt_nomblk_io_submit, "nomblk_io_submit"},
1238 {Opt_block_validity, "block_validity"},
1239 {Opt_noblock_validity, "noblock_validity"},
1240 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1241 {Opt_journal_ioprio, "journal_ioprio=%u"},
1242 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1243 {Opt_auto_da_alloc, "auto_da_alloc"},
1244 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1245 {Opt_dioread_nolock, "dioread_nolock"},
1246 {Opt_dioread_lock, "dioread_lock"},
1247 {Opt_discard, "discard"},
1248 {Opt_nodiscard, "nodiscard"},
1249 {Opt_init_itable, "init_itable=%u"},
1250 {Opt_init_itable, "init_itable"},
1251 {Opt_noinit_itable, "noinit_itable"},
1252 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1253 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1254 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1255 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1256 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1257 {Opt_err, NULL},
1258 };
1259
1260 static ext4_fsblk_t get_sb_block(void **data)
1261 {
1262 ext4_fsblk_t sb_block;
1263 char *options = (char *) *data;
1264
1265 if (!options || strncmp(options, "sb=", 3) != 0)
1266 return 1; /* Default location */
1267
1268 options += 3;
1269 /* TODO: use simple_strtoll with >32bit ext4 */
1270 sb_block = simple_strtoul(options, &options, 0);
1271 if (*options && *options != ',') {
1272 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1273 (char *) *data);
1274 return 1;
1275 }
1276 if (*options == ',')
1277 options++;
1278 *data = (void *) options;
1279
1280 return sb_block;
1281 }
1282
1283 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1284 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1285 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1286
1287 #ifdef CONFIG_QUOTA
1288 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1289 {
1290 struct ext4_sb_info *sbi = EXT4_SB(sb);
1291 char *qname;
1292
1293 if (sb_any_quota_loaded(sb) &&
1294 !sbi->s_qf_names[qtype]) {
1295 ext4_msg(sb, KERN_ERR,
1296 "Cannot change journaled "
1297 "quota options when quota turned on");
1298 return 0;
1299 }
1300 qname = match_strdup(args);
1301 if (!qname) {
1302 ext4_msg(sb, KERN_ERR,
1303 "Not enough memory for storing quotafile name");
1304 return 0;
1305 }
1306 if (sbi->s_qf_names[qtype] &&
1307 strcmp(sbi->s_qf_names[qtype], qname)) {
1308 ext4_msg(sb, KERN_ERR,
1309 "%s quota file already specified", QTYPE2NAME(qtype));
1310 kfree(qname);
1311 return 0;
1312 }
1313 sbi->s_qf_names[qtype] = qname;
1314 if (strchr(sbi->s_qf_names[qtype], '/')) {
1315 ext4_msg(sb, KERN_ERR,
1316 "quotafile must be on filesystem root");
1317 kfree(sbi->s_qf_names[qtype]);
1318 sbi->s_qf_names[qtype] = NULL;
1319 return 0;
1320 }
1321 set_opt(sb, QUOTA);
1322 return 1;
1323 }
1324
1325 static int clear_qf_name(struct super_block *sb, int qtype)
1326 {
1327
1328 struct ext4_sb_info *sbi = EXT4_SB(sb);
1329
1330 if (sb_any_quota_loaded(sb) &&
1331 sbi->s_qf_names[qtype]) {
1332 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1333 " when quota turned on");
1334 return 0;
1335 }
1336 /*
1337 * The space will be released later when all options are confirmed
1338 * to be correct
1339 */
1340 sbi->s_qf_names[qtype] = NULL;
1341 return 1;
1342 }
1343 #endif
1344
1345 #define MOPT_SET 0x0001
1346 #define MOPT_CLEAR 0x0002
1347 #define MOPT_NOSUPPORT 0x0004
1348 #define MOPT_EXPLICIT 0x0008
1349 #define MOPT_CLEAR_ERR 0x0010
1350 #define MOPT_GTE0 0x0020
1351 #ifdef CONFIG_QUOTA
1352 #define MOPT_Q 0
1353 #define MOPT_QFMT 0x0040
1354 #else
1355 #define MOPT_Q MOPT_NOSUPPORT
1356 #define MOPT_QFMT MOPT_NOSUPPORT
1357 #endif
1358 #define MOPT_DATAJ 0x0080
1359
1360 static const struct mount_opts {
1361 int token;
1362 int mount_opt;
1363 int flags;
1364 } ext4_mount_opts[] = {
1365 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1366 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1367 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1368 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1369 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1370 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1371 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1372 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1373 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1374 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1375 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1376 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1377 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1378 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1379 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1380 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1381 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1382 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1383 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1384 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1385 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1386 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1387 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1388 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1389 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1390 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1391 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1392 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1393 {Opt_commit, 0, MOPT_GTE0},
1394 {Opt_max_batch_time, 0, MOPT_GTE0},
1395 {Opt_min_batch_time, 0, MOPT_GTE0},
1396 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1397 {Opt_init_itable, 0, MOPT_GTE0},
1398 {Opt_stripe, 0, MOPT_GTE0},
1399 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1400 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1401 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
1402 #ifdef CONFIG_EXT4_FS_XATTR
1403 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1404 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1405 #else
1406 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1407 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
1408 #endif
1409 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1410 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1411 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1412 #else
1413 {Opt_acl, 0, MOPT_NOSUPPORT},
1414 {Opt_noacl, 0, MOPT_NOSUPPORT},
1415 #endif
1416 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1417 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1418 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1419 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1420 MOPT_SET | MOPT_Q},
1421 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1422 MOPT_SET | MOPT_Q},
1423 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1424 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1425 {Opt_usrjquota, 0, MOPT_Q},
1426 {Opt_grpjquota, 0, MOPT_Q},
1427 {Opt_offusrjquota, 0, MOPT_Q},
1428 {Opt_offgrpjquota, 0, MOPT_Q},
1429 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1430 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1431 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1432 {Opt_err, 0, 0}
1433 };
1434
1435 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1436 substring_t *args, unsigned long *journal_devnum,
1437 unsigned int *journal_ioprio, int is_remount)
1438 {
1439 struct ext4_sb_info *sbi = EXT4_SB(sb);
1440 const struct mount_opts *m;
1441 int arg = 0;
1442
1443 if (args->from && match_int(args, &arg))
1444 return -1;
1445 switch (token) {
1446 case Opt_sb:
1447 return 1; /* handled by get_sb_block() */
1448 case Opt_removed:
1449 ext4_msg(sb, KERN_WARNING,
1450 "Ignoring removed %s option", opt);
1451 return 1;
1452 case Opt_resuid:
1453 sbi->s_resuid = arg;
1454 return 1;
1455 case Opt_resgid:
1456 sbi->s_resgid = arg;
1457 return 1;
1458 case Opt_abort:
1459 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1460 return 1;
1461 case Opt_i_version:
1462 sb->s_flags |= MS_I_VERSION;
1463 return 1;
1464 case Opt_journal_dev:
1465 if (is_remount) {
1466 ext4_msg(sb, KERN_ERR,
1467 "Cannot specify journal on remount");
1468 return -1;
1469 }
1470 *journal_devnum = arg;
1471 return 1;
1472 case Opt_journal_ioprio:
1473 if (arg < 0 || arg > 7)
1474 return -1;
1475 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1476 return 1;
1477 }
1478
1479 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1480 if (token != m->token)
1481 continue;
1482 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1483 return -1;
1484 if (m->flags & MOPT_EXPLICIT)
1485 set_opt2(sb, EXPLICIT_DELALLOC);
1486 if (m->flags & MOPT_CLEAR_ERR)
1487 clear_opt(sb, ERRORS_MASK);
1488 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1489 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1490 "options when quota turned on");
1491 return -1;
1492 }
1493
1494 if (m->flags & MOPT_NOSUPPORT) {
1495 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1496 } else if (token == Opt_commit) {
1497 if (arg == 0)
1498 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1499 sbi->s_commit_interval = HZ * arg;
1500 } else if (token == Opt_max_batch_time) {
1501 if (arg == 0)
1502 arg = EXT4_DEF_MAX_BATCH_TIME;
1503 sbi->s_max_batch_time = arg;
1504 } else if (token == Opt_min_batch_time) {
1505 sbi->s_min_batch_time = arg;
1506 } else if (token == Opt_inode_readahead_blks) {
1507 if (arg > (1 << 30))
1508 return -1;
1509 if (arg && !is_power_of_2(arg)) {
1510 ext4_msg(sb, KERN_ERR,
1511 "EXT4-fs: inode_readahead_blks"
1512 " must be a power of 2");
1513 return -1;
1514 }
1515 sbi->s_inode_readahead_blks = arg;
1516 } else if (token == Opt_init_itable) {
1517 set_opt(sb, INIT_INODE_TABLE);
1518 if (!args->from)
1519 arg = EXT4_DEF_LI_WAIT_MULT;
1520 sbi->s_li_wait_mult = arg;
1521 } else if (token == Opt_stripe) {
1522 sbi->s_stripe = arg;
1523 } else if (m->flags & MOPT_DATAJ) {
1524 if (is_remount) {
1525 if (!sbi->s_journal)
1526 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1527 else if (test_opt(sb, DATA_FLAGS) !=
1528 m->mount_opt) {
1529 ext4_msg(sb, KERN_ERR,
1530 "Cannot change data mode on remount");
1531 return -1;
1532 }
1533 } else {
1534 clear_opt(sb, DATA_FLAGS);
1535 sbi->s_mount_opt |= m->mount_opt;
1536 }
1537 #ifdef CONFIG_QUOTA
1538 } else if (token == Opt_usrjquota) {
1539 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1540 return -1;
1541 } else if (token == Opt_grpjquota) {
1542 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1543 return -1;
1544 } else if (token == Opt_offusrjquota) {
1545 if (!clear_qf_name(sb, USRQUOTA))
1546 return -1;
1547 } else if (token == Opt_offgrpjquota) {
1548 if (!clear_qf_name(sb, GRPQUOTA))
1549 return -1;
1550 } else if (m->flags & MOPT_QFMT) {
1551 if (sb_any_quota_loaded(sb) &&
1552 sbi->s_jquota_fmt != m->mount_opt) {
1553 ext4_msg(sb, KERN_ERR, "Cannot "
1554 "change journaled quota options "
1555 "when quota turned on");
1556 return -1;
1557 }
1558 sbi->s_jquota_fmt = m->mount_opt;
1559 #endif
1560 } else {
1561 if (!args->from)
1562 arg = 1;
1563 if (m->flags & MOPT_CLEAR)
1564 arg = !arg;
1565 else if (unlikely(!(m->flags & MOPT_SET))) {
1566 ext4_msg(sb, KERN_WARNING,
1567 "buggy handling of option %s", opt);
1568 WARN_ON(1);
1569 return -1;
1570 }
1571 if (arg != 0)
1572 sbi->s_mount_opt |= m->mount_opt;
1573 else
1574 sbi->s_mount_opt &= ~m->mount_opt;
1575 }
1576 return 1;
1577 }
1578 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1579 "or missing value", opt);
1580 return -1;
1581 }
1582
1583 static int parse_options(char *options, struct super_block *sb,
1584 unsigned long *journal_devnum,
1585 unsigned int *journal_ioprio,
1586 int is_remount)
1587 {
1588 struct ext4_sb_info *sbi = EXT4_SB(sb);
1589 char *p;
1590 substring_t args[MAX_OPT_ARGS];
1591 int token;
1592
1593 if (!options)
1594 return 1;
1595
1596 while ((p = strsep(&options, ",")) != NULL) {
1597 if (!*p)
1598 continue;
1599 /*
1600 * Initialize args struct so we know whether arg was
1601 * found; some options take optional arguments.
1602 */
1603 args[0].to = args[0].from = 0;
1604 token = match_token(p, tokens, args);
1605 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1606 journal_ioprio, is_remount) < 0)
1607 return 0;
1608 }
1609 #ifdef CONFIG_QUOTA
1610 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1611 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1612 clear_opt(sb, USRQUOTA);
1613
1614 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1615 clear_opt(sb, GRPQUOTA);
1616
1617 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1618 ext4_msg(sb, KERN_ERR, "old and new quota "
1619 "format mixing");
1620 return 0;
1621 }
1622
1623 if (!sbi->s_jquota_fmt) {
1624 ext4_msg(sb, KERN_ERR, "journaled quota format "
1625 "not specified");
1626 return 0;
1627 }
1628 } else {
1629 if (sbi->s_jquota_fmt) {
1630 ext4_msg(sb, KERN_ERR, "journaled quota format "
1631 "specified with no journaling "
1632 "enabled");
1633 return 0;
1634 }
1635 }
1636 #endif
1637 return 1;
1638 }
1639
1640 static inline void ext4_show_quota_options(struct seq_file *seq,
1641 struct super_block *sb)
1642 {
1643 #if defined(CONFIG_QUOTA)
1644 struct ext4_sb_info *sbi = EXT4_SB(sb);
1645
1646 if (sbi->s_jquota_fmt) {
1647 char *fmtname = "";
1648
1649 switch (sbi->s_jquota_fmt) {
1650 case QFMT_VFS_OLD:
1651 fmtname = "vfsold";
1652 break;
1653 case QFMT_VFS_V0:
1654 fmtname = "vfsv0";
1655 break;
1656 case QFMT_VFS_V1:
1657 fmtname = "vfsv1";
1658 break;
1659 }
1660 seq_printf(seq, ",jqfmt=%s", fmtname);
1661 }
1662
1663 if (sbi->s_qf_names[USRQUOTA])
1664 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1665
1666 if (sbi->s_qf_names[GRPQUOTA])
1667 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1668
1669 if (test_opt(sb, USRQUOTA))
1670 seq_puts(seq, ",usrquota");
1671
1672 if (test_opt(sb, GRPQUOTA))
1673 seq_puts(seq, ",grpquota");
1674 #endif
1675 }
1676
1677 static const char *token2str(int token)
1678 {
1679 static const struct match_token *t;
1680
1681 for (t = tokens; t->token != Opt_err; t++)
1682 if (t->token == token && !strchr(t->pattern, '='))
1683 break;
1684 return t->pattern;
1685 }
1686
1687 /*
1688 * Show an option if
1689 * - it's set to a non-default value OR
1690 * - if the per-sb default is different from the global default
1691 */
1692 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1693 int nodefs)
1694 {
1695 struct ext4_sb_info *sbi = EXT4_SB(sb);
1696 struct ext4_super_block *es = sbi->s_es;
1697 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1698 const struct mount_opts *m;
1699 char sep = nodefs ? '\n' : ',';
1700
1701 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1702 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1703
1704 if (sbi->s_sb_block != 1)
1705 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1706
1707 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1708 int want_set = m->flags & MOPT_SET;
1709 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1710 (m->flags & MOPT_CLEAR_ERR))
1711 continue;
1712 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1713 continue; /* skip if same as the default */
1714 if ((want_set &&
1715 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1716 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1717 continue; /* select Opt_noFoo vs Opt_Foo */
1718 SEQ_OPTS_PRINT("%s", token2str(m->token));
1719 }
1720
1721 if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID ||
1722 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1723 SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid);
1724 if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID ||
1725 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1726 SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid);
1727 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1728 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1729 SEQ_OPTS_PUTS("errors=remount-ro");
1730 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1731 SEQ_OPTS_PUTS("errors=continue");
1732 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1733 SEQ_OPTS_PUTS("errors=panic");
1734 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1735 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1736 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1737 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1738 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1739 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1740 if (sb->s_flags & MS_I_VERSION)
1741 SEQ_OPTS_PUTS("i_version");
1742 if (nodefs || sbi->s_stripe)
1743 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1744 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1745 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1746 SEQ_OPTS_PUTS("data=journal");
1747 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1748 SEQ_OPTS_PUTS("data=ordered");
1749 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1750 SEQ_OPTS_PUTS("data=writeback");
1751 }
1752 if (nodefs ||
1753 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1754 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1755 sbi->s_inode_readahead_blks);
1756
1757 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1758 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1759 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1760
1761 ext4_show_quota_options(seq, sb);
1762 return 0;
1763 }
1764
1765 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1766 {
1767 return _ext4_show_options(seq, root->d_sb, 0);
1768 }
1769
1770 static int options_seq_show(struct seq_file *seq, void *offset)
1771 {
1772 struct super_block *sb = seq->private;
1773 int rc;
1774
1775 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1776 rc = _ext4_show_options(seq, sb, 1);
1777 seq_puts(seq, "\n");
1778 return rc;
1779 }
1780
1781 static int options_open_fs(struct inode *inode, struct file *file)
1782 {
1783 return single_open(file, options_seq_show, PDE(inode)->data);
1784 }
1785
1786 static const struct file_operations ext4_seq_options_fops = {
1787 .owner = THIS_MODULE,
1788 .open = options_open_fs,
1789 .read = seq_read,
1790 .llseek = seq_lseek,
1791 .release = single_release,
1792 };
1793
1794 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1795 int read_only)
1796 {
1797 struct ext4_sb_info *sbi = EXT4_SB(sb);
1798 int res = 0;
1799
1800 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1801 ext4_msg(sb, KERN_ERR, "revision level too high, "
1802 "forcing read-only mode");
1803 res = MS_RDONLY;
1804 }
1805 if (read_only)
1806 goto done;
1807 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1808 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1809 "running e2fsck is recommended");
1810 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1811 ext4_msg(sb, KERN_WARNING,
1812 "warning: mounting fs with errors, "
1813 "running e2fsck is recommended");
1814 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1815 le16_to_cpu(es->s_mnt_count) >=
1816 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1817 ext4_msg(sb, KERN_WARNING,
1818 "warning: maximal mount count reached, "
1819 "running e2fsck is recommended");
1820 else if (le32_to_cpu(es->s_checkinterval) &&
1821 (le32_to_cpu(es->s_lastcheck) +
1822 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1823 ext4_msg(sb, KERN_WARNING,
1824 "warning: checktime reached, "
1825 "running e2fsck is recommended");
1826 if (!sbi->s_journal)
1827 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1828 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1829 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1830 le16_add_cpu(&es->s_mnt_count, 1);
1831 es->s_mtime = cpu_to_le32(get_seconds());
1832 ext4_update_dynamic_rev(sb);
1833 if (sbi->s_journal)
1834 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1835
1836 ext4_commit_super(sb, 1);
1837 done:
1838 if (test_opt(sb, DEBUG))
1839 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1840 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1841 sb->s_blocksize,
1842 sbi->s_groups_count,
1843 EXT4_BLOCKS_PER_GROUP(sb),
1844 EXT4_INODES_PER_GROUP(sb),
1845 sbi->s_mount_opt, sbi->s_mount_opt2);
1846
1847 cleancache_init_fs(sb);
1848 return res;
1849 }
1850
1851 static int ext4_fill_flex_info(struct super_block *sb)
1852 {
1853 struct ext4_sb_info *sbi = EXT4_SB(sb);
1854 struct ext4_group_desc *gdp = NULL;
1855 ext4_group_t flex_group_count;
1856 ext4_group_t flex_group;
1857 unsigned int groups_per_flex = 0;
1858 size_t size;
1859 int i;
1860
1861 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1862 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1863 sbi->s_log_groups_per_flex = 0;
1864 return 1;
1865 }
1866 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1867
1868 /* We allocate both existing and potentially added groups */
1869 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1870 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1871 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1872 size = flex_group_count * sizeof(struct flex_groups);
1873 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
1874 if (sbi->s_flex_groups == NULL) {
1875 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1876 flex_group_count);
1877 goto failed;
1878 }
1879
1880 for (i = 0; i < sbi->s_groups_count; i++) {
1881 gdp = ext4_get_group_desc(sb, i, NULL);
1882
1883 flex_group = ext4_flex_group(sbi, i);
1884 atomic_add(ext4_free_inodes_count(sb, gdp),
1885 &sbi->s_flex_groups[flex_group].free_inodes);
1886 atomic_add(ext4_free_group_clusters(sb, gdp),
1887 &sbi->s_flex_groups[flex_group].free_clusters);
1888 atomic_add(ext4_used_dirs_count(sb, gdp),
1889 &sbi->s_flex_groups[flex_group].used_dirs);
1890 }
1891
1892 return 1;
1893 failed:
1894 return 0;
1895 }
1896
1897 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1898 struct ext4_group_desc *gdp)
1899 {
1900 __u16 crc = 0;
1901
1902 if (sbi->s_es->s_feature_ro_compat &
1903 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1904 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1905 __le32 le_group = cpu_to_le32(block_group);
1906
1907 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1908 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1909 crc = crc16(crc, (__u8 *)gdp, offset);
1910 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1911 /* for checksum of struct ext4_group_desc do the rest...*/
1912 if ((sbi->s_es->s_feature_incompat &
1913 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1914 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1915 crc = crc16(crc, (__u8 *)gdp + offset,
1916 le16_to_cpu(sbi->s_es->s_desc_size) -
1917 offset);
1918 }
1919
1920 return cpu_to_le16(crc);
1921 }
1922
1923 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1924 struct ext4_group_desc *gdp)
1925 {
1926 if ((sbi->s_es->s_feature_ro_compat &
1927 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1928 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1929 return 0;
1930
1931 return 1;
1932 }
1933
1934 /* Called at mount-time, super-block is locked */
1935 static int ext4_check_descriptors(struct super_block *sb,
1936 ext4_group_t *first_not_zeroed)
1937 {
1938 struct ext4_sb_info *sbi = EXT4_SB(sb);
1939 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1940 ext4_fsblk_t last_block;
1941 ext4_fsblk_t block_bitmap;
1942 ext4_fsblk_t inode_bitmap;
1943 ext4_fsblk_t inode_table;
1944 int flexbg_flag = 0;
1945 ext4_group_t i, grp = sbi->s_groups_count;
1946
1947 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1948 flexbg_flag = 1;
1949
1950 ext4_debug("Checking group descriptors");
1951
1952 for (i = 0; i < sbi->s_groups_count; i++) {
1953 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1954
1955 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1956 last_block = ext4_blocks_count(sbi->s_es) - 1;
1957 else
1958 last_block = first_block +
1959 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1960
1961 if ((grp == sbi->s_groups_count) &&
1962 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
1963 grp = i;
1964
1965 block_bitmap = ext4_block_bitmap(sb, gdp);
1966 if (block_bitmap < first_block || block_bitmap > last_block) {
1967 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1968 "Block bitmap for group %u not in group "
1969 "(block %llu)!", i, block_bitmap);
1970 return 0;
1971 }
1972 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1973 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1974 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1975 "Inode bitmap for group %u not in group "
1976 "(block %llu)!", i, inode_bitmap);
1977 return 0;
1978 }
1979 inode_table = ext4_inode_table(sb, gdp);
1980 if (inode_table < first_block ||
1981 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1982 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1983 "Inode table for group %u not in group "
1984 "(block %llu)!", i, inode_table);
1985 return 0;
1986 }
1987 ext4_lock_group(sb, i);
1988 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1989 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1990 "Checksum for group %u failed (%u!=%u)",
1991 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1992 gdp)), le16_to_cpu(gdp->bg_checksum));
1993 if (!(sb->s_flags & MS_RDONLY)) {
1994 ext4_unlock_group(sb, i);
1995 return 0;
1996 }
1997 }
1998 ext4_unlock_group(sb, i);
1999 if (!flexbg_flag)
2000 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2001 }
2002 if (NULL != first_not_zeroed)
2003 *first_not_zeroed = grp;
2004
2005 ext4_free_blocks_count_set(sbi->s_es,
2006 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2007 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2008 return 1;
2009 }
2010
2011 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2012 * the superblock) which were deleted from all directories, but held open by
2013 * a process at the time of a crash. We walk the list and try to delete these
2014 * inodes at recovery time (only with a read-write filesystem).
2015 *
2016 * In order to keep the orphan inode chain consistent during traversal (in
2017 * case of crash during recovery), we link each inode into the superblock
2018 * orphan list_head and handle it the same way as an inode deletion during
2019 * normal operation (which journals the operations for us).
2020 *
2021 * We only do an iget() and an iput() on each inode, which is very safe if we
2022 * accidentally point at an in-use or already deleted inode. The worst that
2023 * can happen in this case is that we get a "bit already cleared" message from
2024 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2025 * e2fsck was run on this filesystem, and it must have already done the orphan
2026 * inode cleanup for us, so we can safely abort without any further action.
2027 */
2028 static void ext4_orphan_cleanup(struct super_block *sb,
2029 struct ext4_super_block *es)
2030 {
2031 unsigned int s_flags = sb->s_flags;
2032 int nr_orphans = 0, nr_truncates = 0;
2033 #ifdef CONFIG_QUOTA
2034 int i;
2035 #endif
2036 if (!es->s_last_orphan) {
2037 jbd_debug(4, "no orphan inodes to clean up\n");
2038 return;
2039 }
2040
2041 if (bdev_read_only(sb->s_bdev)) {
2042 ext4_msg(sb, KERN_ERR, "write access "
2043 "unavailable, skipping orphan cleanup");
2044 return;
2045 }
2046
2047 /* Check if feature set would not allow a r/w mount */
2048 if (!ext4_feature_set_ok(sb, 0)) {
2049 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2050 "unknown ROCOMPAT features");
2051 return;
2052 }
2053
2054 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2055 if (es->s_last_orphan)
2056 jbd_debug(1, "Errors on filesystem, "
2057 "clearing orphan list.\n");
2058 es->s_last_orphan = 0;
2059 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2060 return;
2061 }
2062
2063 if (s_flags & MS_RDONLY) {
2064 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2065 sb->s_flags &= ~MS_RDONLY;
2066 }
2067 #ifdef CONFIG_QUOTA
2068 /* Needed for iput() to work correctly and not trash data */
2069 sb->s_flags |= MS_ACTIVE;
2070 /* Turn on quotas so that they are updated correctly */
2071 for (i = 0; i < MAXQUOTAS; i++) {
2072 if (EXT4_SB(sb)->s_qf_names[i]) {
2073 int ret = ext4_quota_on_mount(sb, i);
2074 if (ret < 0)
2075 ext4_msg(sb, KERN_ERR,
2076 "Cannot turn on journaled "
2077 "quota: error %d", ret);
2078 }
2079 }
2080 #endif
2081
2082 while (es->s_last_orphan) {
2083 struct inode *inode;
2084
2085 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2086 if (IS_ERR(inode)) {
2087 es->s_last_orphan = 0;
2088 break;
2089 }
2090
2091 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2092 dquot_initialize(inode);
2093 if (inode->i_nlink) {
2094 ext4_msg(sb, KERN_DEBUG,
2095 "%s: truncating inode %lu to %lld bytes",
2096 __func__, inode->i_ino, inode->i_size);
2097 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2098 inode->i_ino, inode->i_size);
2099 ext4_truncate(inode);
2100 nr_truncates++;
2101 } else {
2102 ext4_msg(sb, KERN_DEBUG,
2103 "%s: deleting unreferenced inode %lu",
2104 __func__, inode->i_ino);
2105 jbd_debug(2, "deleting unreferenced inode %lu\n",
2106 inode->i_ino);
2107 nr_orphans++;
2108 }
2109 iput(inode); /* The delete magic happens here! */
2110 }
2111
2112 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2113
2114 if (nr_orphans)
2115 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2116 PLURAL(nr_orphans));
2117 if (nr_truncates)
2118 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2119 PLURAL(nr_truncates));
2120 #ifdef CONFIG_QUOTA
2121 /* Turn quotas off */
2122 for (i = 0; i < MAXQUOTAS; i++) {
2123 if (sb_dqopt(sb)->files[i])
2124 dquot_quota_off(sb, i);
2125 }
2126 #endif
2127 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2128 }
2129
2130 /*
2131 * Maximal extent format file size.
2132 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2133 * extent format containers, within a sector_t, and within i_blocks
2134 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2135 * so that won't be a limiting factor.
2136 *
2137 * However there is other limiting factor. We do store extents in the form
2138 * of starting block and length, hence the resulting length of the extent
2139 * covering maximum file size must fit into on-disk format containers as
2140 * well. Given that length is always by 1 unit bigger than max unit (because
2141 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2142 *
2143 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2144 */
2145 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2146 {
2147 loff_t res;
2148 loff_t upper_limit = MAX_LFS_FILESIZE;
2149
2150 /* small i_blocks in vfs inode? */
2151 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2152 /*
2153 * CONFIG_LBDAF is not enabled implies the inode
2154 * i_block represent total blocks in 512 bytes
2155 * 32 == size of vfs inode i_blocks * 8
2156 */
2157 upper_limit = (1LL << 32) - 1;
2158
2159 /* total blocks in file system block size */
2160 upper_limit >>= (blkbits - 9);
2161 upper_limit <<= blkbits;
2162 }
2163
2164 /*
2165 * 32-bit extent-start container, ee_block. We lower the maxbytes
2166 * by one fs block, so ee_len can cover the extent of maximum file
2167 * size
2168 */
2169 res = (1LL << 32) - 1;
2170 res <<= blkbits;
2171
2172 /* Sanity check against vm- & vfs- imposed limits */
2173 if (res > upper_limit)
2174 res = upper_limit;
2175
2176 return res;
2177 }
2178
2179 /*
2180 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2181 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2182 * We need to be 1 filesystem block less than the 2^48 sector limit.
2183 */
2184 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2185 {
2186 loff_t res = EXT4_NDIR_BLOCKS;
2187 int meta_blocks;
2188 loff_t upper_limit;
2189 /* This is calculated to be the largest file size for a dense, block
2190 * mapped file such that the file's total number of 512-byte sectors,
2191 * including data and all indirect blocks, does not exceed (2^48 - 1).
2192 *
2193 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2194 * number of 512-byte sectors of the file.
2195 */
2196
2197 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2198 /*
2199 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2200 * the inode i_block field represents total file blocks in
2201 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2202 */
2203 upper_limit = (1LL << 32) - 1;
2204
2205 /* total blocks in file system block size */
2206 upper_limit >>= (bits - 9);
2207
2208 } else {
2209 /*
2210 * We use 48 bit ext4_inode i_blocks
2211 * With EXT4_HUGE_FILE_FL set the i_blocks
2212 * represent total number of blocks in
2213 * file system block size
2214 */
2215 upper_limit = (1LL << 48) - 1;
2216
2217 }
2218
2219 /* indirect blocks */
2220 meta_blocks = 1;
2221 /* double indirect blocks */
2222 meta_blocks += 1 + (1LL << (bits-2));
2223 /* tripple indirect blocks */
2224 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2225
2226 upper_limit -= meta_blocks;
2227 upper_limit <<= bits;
2228
2229 res += 1LL << (bits-2);
2230 res += 1LL << (2*(bits-2));
2231 res += 1LL << (3*(bits-2));
2232 res <<= bits;
2233 if (res > upper_limit)
2234 res = upper_limit;
2235
2236 if (res > MAX_LFS_FILESIZE)
2237 res = MAX_LFS_FILESIZE;
2238
2239 return res;
2240 }
2241
2242 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2243 ext4_fsblk_t logical_sb_block, int nr)
2244 {
2245 struct ext4_sb_info *sbi = EXT4_SB(sb);
2246 ext4_group_t bg, first_meta_bg;
2247 int has_super = 0;
2248
2249 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2250
2251 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2252 nr < first_meta_bg)
2253 return logical_sb_block + nr + 1;
2254 bg = sbi->s_desc_per_block * nr;
2255 if (ext4_bg_has_super(sb, bg))
2256 has_super = 1;
2257
2258 return (has_super + ext4_group_first_block_no(sb, bg));
2259 }
2260
2261 /**
2262 * ext4_get_stripe_size: Get the stripe size.
2263 * @sbi: In memory super block info
2264 *
2265 * If we have specified it via mount option, then
2266 * use the mount option value. If the value specified at mount time is
2267 * greater than the blocks per group use the super block value.
2268 * If the super block value is greater than blocks per group return 0.
2269 * Allocator needs it be less than blocks per group.
2270 *
2271 */
2272 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2273 {
2274 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2275 unsigned long stripe_width =
2276 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2277 int ret;
2278
2279 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2280 ret = sbi->s_stripe;
2281 else if (stripe_width <= sbi->s_blocks_per_group)
2282 ret = stripe_width;
2283 else if (stride <= sbi->s_blocks_per_group)
2284 ret = stride;
2285 else
2286 ret = 0;
2287
2288 /*
2289 * If the stripe width is 1, this makes no sense and
2290 * we set it to 0 to turn off stripe handling code.
2291 */
2292 if (ret <= 1)
2293 ret = 0;
2294
2295 return ret;
2296 }
2297
2298 /* sysfs supprt */
2299
2300 struct ext4_attr {
2301 struct attribute attr;
2302 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2303 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2304 const char *, size_t);
2305 int offset;
2306 };
2307
2308 static int parse_strtoul(const char *buf,
2309 unsigned long max, unsigned long *value)
2310 {
2311 char *endp;
2312
2313 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2314 endp = skip_spaces(endp);
2315 if (*endp || *value > max)
2316 return -EINVAL;
2317
2318 return 0;
2319 }
2320
2321 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2322 struct ext4_sb_info *sbi,
2323 char *buf)
2324 {
2325 return snprintf(buf, PAGE_SIZE, "%llu\n",
2326 (s64) EXT4_C2B(sbi,
2327 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2328 }
2329
2330 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2331 struct ext4_sb_info *sbi, char *buf)
2332 {
2333 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2334
2335 if (!sb->s_bdev->bd_part)
2336 return snprintf(buf, PAGE_SIZE, "0\n");
2337 return snprintf(buf, PAGE_SIZE, "%lu\n",
2338 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2339 sbi->s_sectors_written_start) >> 1);
2340 }
2341
2342 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2343 struct ext4_sb_info *sbi, char *buf)
2344 {
2345 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2346
2347 if (!sb->s_bdev->bd_part)
2348 return snprintf(buf, PAGE_SIZE, "0\n");
2349 return snprintf(buf, PAGE_SIZE, "%llu\n",
2350 (unsigned long long)(sbi->s_kbytes_written +
2351 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2352 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2353 }
2354
2355 static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2356 struct ext4_sb_info *sbi, char *buf)
2357 {
2358 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2359 }
2360
2361 static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2362 struct ext4_sb_info *sbi, char *buf)
2363 {
2364 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2365 }
2366
2367 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2368 struct ext4_sb_info *sbi,
2369 const char *buf, size_t count)
2370 {
2371 unsigned long t;
2372
2373 if (parse_strtoul(buf, 0x40000000, &t))
2374 return -EINVAL;
2375
2376 if (t && !is_power_of_2(t))
2377 return -EINVAL;
2378
2379 sbi->s_inode_readahead_blks = t;
2380 return count;
2381 }
2382
2383 static ssize_t sbi_ui_show(struct ext4_attr *a,
2384 struct ext4_sb_info *sbi, char *buf)
2385 {
2386 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2387
2388 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2389 }
2390
2391 static ssize_t sbi_ui_store(struct ext4_attr *a,
2392 struct ext4_sb_info *sbi,
2393 const char *buf, size_t count)
2394 {
2395 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2396 unsigned long t;
2397
2398 if (parse_strtoul(buf, 0xffffffff, &t))
2399 return -EINVAL;
2400 *ui = t;
2401 return count;
2402 }
2403
2404 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2405 static struct ext4_attr ext4_attr_##_name = { \
2406 .attr = {.name = __stringify(_name), .mode = _mode }, \
2407 .show = _show, \
2408 .store = _store, \
2409 .offset = offsetof(struct ext4_sb_info, _elname), \
2410 }
2411 #define EXT4_ATTR(name, mode, show, store) \
2412 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2413
2414 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2415 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2416 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2417 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2418 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2419 #define ATTR_LIST(name) &ext4_attr_##name.attr
2420
2421 EXT4_RO_ATTR(delayed_allocation_blocks);
2422 EXT4_RO_ATTR(session_write_kbytes);
2423 EXT4_RO_ATTR(lifetime_write_kbytes);
2424 EXT4_RO_ATTR(extent_cache_hits);
2425 EXT4_RO_ATTR(extent_cache_misses);
2426 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2427 inode_readahead_blks_store, s_inode_readahead_blks);
2428 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2429 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2430 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2431 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2432 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2433 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2434 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2435 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2436
2437 static struct attribute *ext4_attrs[] = {
2438 ATTR_LIST(delayed_allocation_blocks),
2439 ATTR_LIST(session_write_kbytes),
2440 ATTR_LIST(lifetime_write_kbytes),
2441 ATTR_LIST(extent_cache_hits),
2442 ATTR_LIST(extent_cache_misses),
2443 ATTR_LIST(inode_readahead_blks),
2444 ATTR_LIST(inode_goal),
2445 ATTR_LIST(mb_stats),
2446 ATTR_LIST(mb_max_to_scan),
2447 ATTR_LIST(mb_min_to_scan),
2448 ATTR_LIST(mb_order2_req),
2449 ATTR_LIST(mb_stream_req),
2450 ATTR_LIST(mb_group_prealloc),
2451 ATTR_LIST(max_writeback_mb_bump),
2452 NULL,
2453 };
2454
2455 /* Features this copy of ext4 supports */
2456 EXT4_INFO_ATTR(lazy_itable_init);
2457 EXT4_INFO_ATTR(batched_discard);
2458
2459 static struct attribute *ext4_feat_attrs[] = {
2460 ATTR_LIST(lazy_itable_init),
2461 ATTR_LIST(batched_discard),
2462 NULL,
2463 };
2464
2465 static ssize_t ext4_attr_show(struct kobject *kobj,
2466 struct attribute *attr, char *buf)
2467 {
2468 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2469 s_kobj);
2470 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2471
2472 return a->show ? a->show(a, sbi, buf) : 0;
2473 }
2474
2475 static ssize_t ext4_attr_store(struct kobject *kobj,
2476 struct attribute *attr,
2477 const char *buf, size_t len)
2478 {
2479 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2480 s_kobj);
2481 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2482
2483 return a->store ? a->store(a, sbi, buf, len) : 0;
2484 }
2485
2486 static void ext4_sb_release(struct kobject *kobj)
2487 {
2488 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2489 s_kobj);
2490 complete(&sbi->s_kobj_unregister);
2491 }
2492
2493 static const struct sysfs_ops ext4_attr_ops = {
2494 .show = ext4_attr_show,
2495 .store = ext4_attr_store,
2496 };
2497
2498 static struct kobj_type ext4_ktype = {
2499 .default_attrs = ext4_attrs,
2500 .sysfs_ops = &ext4_attr_ops,
2501 .release = ext4_sb_release,
2502 };
2503
2504 static void ext4_feat_release(struct kobject *kobj)
2505 {
2506 complete(&ext4_feat->f_kobj_unregister);
2507 }
2508
2509 static struct kobj_type ext4_feat_ktype = {
2510 .default_attrs = ext4_feat_attrs,
2511 .sysfs_ops = &ext4_attr_ops,
2512 .release = ext4_feat_release,
2513 };
2514
2515 /*
2516 * Check whether this filesystem can be mounted based on
2517 * the features present and the RDONLY/RDWR mount requested.
2518 * Returns 1 if this filesystem can be mounted as requested,
2519 * 0 if it cannot be.
2520 */
2521 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2522 {
2523 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2524 ext4_msg(sb, KERN_ERR,
2525 "Couldn't mount because of "
2526 "unsupported optional features (%x)",
2527 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2528 ~EXT4_FEATURE_INCOMPAT_SUPP));
2529 return 0;
2530 }
2531
2532 if (readonly)
2533 return 1;
2534
2535 /* Check that feature set is OK for a read-write mount */
2536 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2537 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2538 "unsupported optional features (%x)",
2539 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2540 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2541 return 0;
2542 }
2543 /*
2544 * Large file size enabled file system can only be mounted
2545 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2546 */
2547 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2548 if (sizeof(blkcnt_t) < sizeof(u64)) {
2549 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2550 "cannot be mounted RDWR without "
2551 "CONFIG_LBDAF");
2552 return 0;
2553 }
2554 }
2555 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2556 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2557 ext4_msg(sb, KERN_ERR,
2558 "Can't support bigalloc feature without "
2559 "extents feature\n");
2560 return 0;
2561 }
2562 return 1;
2563 }
2564
2565 /*
2566 * This function is called once a day if we have errors logged
2567 * on the file system
2568 */
2569 static void print_daily_error_info(unsigned long arg)
2570 {
2571 struct super_block *sb = (struct super_block *) arg;
2572 struct ext4_sb_info *sbi;
2573 struct ext4_super_block *es;
2574
2575 sbi = EXT4_SB(sb);
2576 es = sbi->s_es;
2577
2578 if (es->s_error_count)
2579 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2580 le32_to_cpu(es->s_error_count));
2581 if (es->s_first_error_time) {
2582 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2583 sb->s_id, le32_to_cpu(es->s_first_error_time),
2584 (int) sizeof(es->s_first_error_func),
2585 es->s_first_error_func,
2586 le32_to_cpu(es->s_first_error_line));
2587 if (es->s_first_error_ino)
2588 printk(": inode %u",
2589 le32_to_cpu(es->s_first_error_ino));
2590 if (es->s_first_error_block)
2591 printk(": block %llu", (unsigned long long)
2592 le64_to_cpu(es->s_first_error_block));
2593 printk("\n");
2594 }
2595 if (es->s_last_error_time) {
2596 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2597 sb->s_id, le32_to_cpu(es->s_last_error_time),
2598 (int) sizeof(es->s_last_error_func),
2599 es->s_last_error_func,
2600 le32_to_cpu(es->s_last_error_line));
2601 if (es->s_last_error_ino)
2602 printk(": inode %u",
2603 le32_to_cpu(es->s_last_error_ino));
2604 if (es->s_last_error_block)
2605 printk(": block %llu", (unsigned long long)
2606 le64_to_cpu(es->s_last_error_block));
2607 printk("\n");
2608 }
2609 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2610 }
2611
2612 /* Find next suitable group and run ext4_init_inode_table */
2613 static int ext4_run_li_request(struct ext4_li_request *elr)
2614 {
2615 struct ext4_group_desc *gdp = NULL;
2616 ext4_group_t group, ngroups;
2617 struct super_block *sb;
2618 unsigned long timeout = 0;
2619 int ret = 0;
2620
2621 sb = elr->lr_super;
2622 ngroups = EXT4_SB(sb)->s_groups_count;
2623
2624 for (group = elr->lr_next_group; group < ngroups; group++) {
2625 gdp = ext4_get_group_desc(sb, group, NULL);
2626 if (!gdp) {
2627 ret = 1;
2628 break;
2629 }
2630
2631 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2632 break;
2633 }
2634
2635 if (group == ngroups)
2636 ret = 1;
2637
2638 if (!ret) {
2639 timeout = jiffies;
2640 ret = ext4_init_inode_table(sb, group,
2641 elr->lr_timeout ? 0 : 1);
2642 if (elr->lr_timeout == 0) {
2643 timeout = (jiffies - timeout) *
2644 elr->lr_sbi->s_li_wait_mult;
2645 elr->lr_timeout = timeout;
2646 }
2647 elr->lr_next_sched = jiffies + elr->lr_timeout;
2648 elr->lr_next_group = group + 1;
2649 }
2650
2651 return ret;
2652 }
2653
2654 /*
2655 * Remove lr_request from the list_request and free the
2656 * request structure. Should be called with li_list_mtx held
2657 */
2658 static void ext4_remove_li_request(struct ext4_li_request *elr)
2659 {
2660 struct ext4_sb_info *sbi;
2661
2662 if (!elr)
2663 return;
2664
2665 sbi = elr->lr_sbi;
2666
2667 list_del(&elr->lr_request);
2668 sbi->s_li_request = NULL;
2669 kfree(elr);
2670 }
2671
2672 static void ext4_unregister_li_request(struct super_block *sb)
2673 {
2674 mutex_lock(&ext4_li_mtx);
2675 if (!ext4_li_info) {
2676 mutex_unlock(&ext4_li_mtx);
2677 return;
2678 }
2679
2680 mutex_lock(&ext4_li_info->li_list_mtx);
2681 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2682 mutex_unlock(&ext4_li_info->li_list_mtx);
2683 mutex_unlock(&ext4_li_mtx);
2684 }
2685
2686 static struct task_struct *ext4_lazyinit_task;
2687
2688 /*
2689 * This is the function where ext4lazyinit thread lives. It walks
2690 * through the request list searching for next scheduled filesystem.
2691 * When such a fs is found, run the lazy initialization request
2692 * (ext4_rn_li_request) and keep track of the time spend in this
2693 * function. Based on that time we compute next schedule time of
2694 * the request. When walking through the list is complete, compute
2695 * next waking time and put itself into sleep.
2696 */
2697 static int ext4_lazyinit_thread(void *arg)
2698 {
2699 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2700 struct list_head *pos, *n;
2701 struct ext4_li_request *elr;
2702 unsigned long next_wakeup, cur;
2703
2704 BUG_ON(NULL == eli);
2705
2706 cont_thread:
2707 while (true) {
2708 next_wakeup = MAX_JIFFY_OFFSET;
2709
2710 mutex_lock(&eli->li_list_mtx);
2711 if (list_empty(&eli->li_request_list)) {
2712 mutex_unlock(&eli->li_list_mtx);
2713 goto exit_thread;
2714 }
2715
2716 list_for_each_safe(pos, n, &eli->li_request_list) {
2717 elr = list_entry(pos, struct ext4_li_request,
2718 lr_request);
2719
2720 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2721 if (ext4_run_li_request(elr) != 0) {
2722 /* error, remove the lazy_init job */
2723 ext4_remove_li_request(elr);
2724 continue;
2725 }
2726 }
2727
2728 if (time_before(elr->lr_next_sched, next_wakeup))
2729 next_wakeup = elr->lr_next_sched;
2730 }
2731 mutex_unlock(&eli->li_list_mtx);
2732
2733 try_to_freeze();
2734
2735 cur = jiffies;
2736 if ((time_after_eq(cur, next_wakeup)) ||
2737 (MAX_JIFFY_OFFSET == next_wakeup)) {
2738 cond_resched();
2739 continue;
2740 }
2741
2742 schedule_timeout_interruptible(next_wakeup - cur);
2743
2744 if (kthread_should_stop()) {
2745 ext4_clear_request_list();
2746 goto exit_thread;
2747 }
2748 }
2749
2750 exit_thread:
2751 /*
2752 * It looks like the request list is empty, but we need
2753 * to check it under the li_list_mtx lock, to prevent any
2754 * additions into it, and of course we should lock ext4_li_mtx
2755 * to atomically free the list and ext4_li_info, because at
2756 * this point another ext4 filesystem could be registering
2757 * new one.
2758 */
2759 mutex_lock(&ext4_li_mtx);
2760 mutex_lock(&eli->li_list_mtx);
2761 if (!list_empty(&eli->li_request_list)) {
2762 mutex_unlock(&eli->li_list_mtx);
2763 mutex_unlock(&ext4_li_mtx);
2764 goto cont_thread;
2765 }
2766 mutex_unlock(&eli->li_list_mtx);
2767 kfree(ext4_li_info);
2768 ext4_li_info = NULL;
2769 mutex_unlock(&ext4_li_mtx);
2770
2771 return 0;
2772 }
2773
2774 static void ext4_clear_request_list(void)
2775 {
2776 struct list_head *pos, *n;
2777 struct ext4_li_request *elr;
2778
2779 mutex_lock(&ext4_li_info->li_list_mtx);
2780 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2781 elr = list_entry(pos, struct ext4_li_request,
2782 lr_request);
2783 ext4_remove_li_request(elr);
2784 }
2785 mutex_unlock(&ext4_li_info->li_list_mtx);
2786 }
2787
2788 static int ext4_run_lazyinit_thread(void)
2789 {
2790 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2791 ext4_li_info, "ext4lazyinit");
2792 if (IS_ERR(ext4_lazyinit_task)) {
2793 int err = PTR_ERR(ext4_lazyinit_task);
2794 ext4_clear_request_list();
2795 kfree(ext4_li_info);
2796 ext4_li_info = NULL;
2797 printk(KERN_CRIT "EXT4: error %d creating inode table "
2798 "initialization thread\n",
2799 err);
2800 return err;
2801 }
2802 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2803 return 0;
2804 }
2805
2806 /*
2807 * Check whether it make sense to run itable init. thread or not.
2808 * If there is at least one uninitialized inode table, return
2809 * corresponding group number, else the loop goes through all
2810 * groups and return total number of groups.
2811 */
2812 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2813 {
2814 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2815 struct ext4_group_desc *gdp = NULL;
2816
2817 for (group = 0; group < ngroups; group++) {
2818 gdp = ext4_get_group_desc(sb, group, NULL);
2819 if (!gdp)
2820 continue;
2821
2822 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2823 break;
2824 }
2825
2826 return group;
2827 }
2828
2829 static int ext4_li_info_new(void)
2830 {
2831 struct ext4_lazy_init *eli = NULL;
2832
2833 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2834 if (!eli)
2835 return -ENOMEM;
2836
2837 INIT_LIST_HEAD(&eli->li_request_list);
2838 mutex_init(&eli->li_list_mtx);
2839
2840 eli->li_state |= EXT4_LAZYINIT_QUIT;
2841
2842 ext4_li_info = eli;
2843
2844 return 0;
2845 }
2846
2847 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2848 ext4_group_t start)
2849 {
2850 struct ext4_sb_info *sbi = EXT4_SB(sb);
2851 struct ext4_li_request *elr;
2852 unsigned long rnd;
2853
2854 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2855 if (!elr)
2856 return NULL;
2857
2858 elr->lr_super = sb;
2859 elr->lr_sbi = sbi;
2860 elr->lr_next_group = start;
2861
2862 /*
2863 * Randomize first schedule time of the request to
2864 * spread the inode table initialization requests
2865 * better.
2866 */
2867 get_random_bytes(&rnd, sizeof(rnd));
2868 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2869 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2870
2871 return elr;
2872 }
2873
2874 static int ext4_register_li_request(struct super_block *sb,
2875 ext4_group_t first_not_zeroed)
2876 {
2877 struct ext4_sb_info *sbi = EXT4_SB(sb);
2878 struct ext4_li_request *elr;
2879 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2880 int ret = 0;
2881
2882 if (sbi->s_li_request != NULL) {
2883 /*
2884 * Reset timeout so it can be computed again, because
2885 * s_li_wait_mult might have changed.
2886 */
2887 sbi->s_li_request->lr_timeout = 0;
2888 return 0;
2889 }
2890
2891 if (first_not_zeroed == ngroups ||
2892 (sb->s_flags & MS_RDONLY) ||
2893 !test_opt(sb, INIT_INODE_TABLE))
2894 return 0;
2895
2896 elr = ext4_li_request_new(sb, first_not_zeroed);
2897 if (!elr)
2898 return -ENOMEM;
2899
2900 mutex_lock(&ext4_li_mtx);
2901
2902 if (NULL == ext4_li_info) {
2903 ret = ext4_li_info_new();
2904 if (ret)
2905 goto out;
2906 }
2907
2908 mutex_lock(&ext4_li_info->li_list_mtx);
2909 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2910 mutex_unlock(&ext4_li_info->li_list_mtx);
2911
2912 sbi->s_li_request = elr;
2913 /*
2914 * set elr to NULL here since it has been inserted to
2915 * the request_list and the removal and free of it is
2916 * handled by ext4_clear_request_list from now on.
2917 */
2918 elr = NULL;
2919
2920 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2921 ret = ext4_run_lazyinit_thread();
2922 if (ret)
2923 goto out;
2924 }
2925 out:
2926 mutex_unlock(&ext4_li_mtx);
2927 if (ret)
2928 kfree(elr);
2929 return ret;
2930 }
2931
2932 /*
2933 * We do not need to lock anything since this is called on
2934 * module unload.
2935 */
2936 static void ext4_destroy_lazyinit_thread(void)
2937 {
2938 /*
2939 * If thread exited earlier
2940 * there's nothing to be done.
2941 */
2942 if (!ext4_li_info || !ext4_lazyinit_task)
2943 return;
2944
2945 kthread_stop(ext4_lazyinit_task);
2946 }
2947
2948 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2949 {
2950 char *orig_data = kstrdup(data, GFP_KERNEL);
2951 struct buffer_head *bh;
2952 struct ext4_super_block *es = NULL;
2953 struct ext4_sb_info *sbi;
2954 ext4_fsblk_t block;
2955 ext4_fsblk_t sb_block = get_sb_block(&data);
2956 ext4_fsblk_t logical_sb_block;
2957 unsigned long offset = 0;
2958 unsigned long journal_devnum = 0;
2959 unsigned long def_mount_opts;
2960 struct inode *root;
2961 char *cp;
2962 const char *descr;
2963 int ret = -ENOMEM;
2964 int blocksize, clustersize;
2965 unsigned int db_count;
2966 unsigned int i;
2967 int needs_recovery, has_huge_files, has_bigalloc;
2968 __u64 blocks_count;
2969 int err;
2970 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2971 ext4_group_t first_not_zeroed;
2972
2973 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2974 if (!sbi)
2975 goto out_free_orig;
2976
2977 sbi->s_blockgroup_lock =
2978 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2979 if (!sbi->s_blockgroup_lock) {
2980 kfree(sbi);
2981 goto out_free_orig;
2982 }
2983 sb->s_fs_info = sbi;
2984 sbi->s_mount_opt = 0;
2985 sbi->s_resuid = EXT4_DEF_RESUID;
2986 sbi->s_resgid = EXT4_DEF_RESGID;
2987 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2988 sbi->s_sb_block = sb_block;
2989 if (sb->s_bdev->bd_part)
2990 sbi->s_sectors_written_start =
2991 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
2992
2993 /* Cleanup superblock name */
2994 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2995 *cp = '!';
2996
2997 ret = -EINVAL;
2998 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2999 if (!blocksize) {
3000 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3001 goto out_fail;
3002 }
3003
3004 /*
3005 * The ext4 superblock will not be buffer aligned for other than 1kB
3006 * block sizes. We need to calculate the offset from buffer start.
3007 */
3008 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3009 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3010 offset = do_div(logical_sb_block, blocksize);
3011 } else {
3012 logical_sb_block = sb_block;
3013 }
3014
3015 if (!(bh = sb_bread(sb, logical_sb_block))) {
3016 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3017 goto out_fail;
3018 }
3019 /*
3020 * Note: s_es must be initialized as soon as possible because
3021 * some ext4 macro-instructions depend on its value
3022 */
3023 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3024 sbi->s_es = es;
3025 sb->s_magic = le16_to_cpu(es->s_magic);
3026 if (sb->s_magic != EXT4_SUPER_MAGIC)
3027 goto cantfind_ext4;
3028 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3029
3030 /* Set defaults before we parse the mount options */
3031 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3032 set_opt(sb, INIT_INODE_TABLE);
3033 if (def_mount_opts & EXT4_DEFM_DEBUG)
3034 set_opt(sb, DEBUG);
3035 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3036 set_opt(sb, GRPID);
3037 if (def_mount_opts & EXT4_DEFM_UID16)
3038 set_opt(sb, NO_UID32);
3039 /* xattr user namespace & acls are now defaulted on */
3040 #ifdef CONFIG_EXT4_FS_XATTR
3041 set_opt(sb, XATTR_USER);
3042 #endif
3043 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3044 set_opt(sb, POSIX_ACL);
3045 #endif
3046 set_opt(sb, MBLK_IO_SUBMIT);
3047 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3048 set_opt(sb, JOURNAL_DATA);
3049 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3050 set_opt(sb, ORDERED_DATA);
3051 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3052 set_opt(sb, WRITEBACK_DATA);
3053
3054 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3055 set_opt(sb, ERRORS_PANIC);
3056 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3057 set_opt(sb, ERRORS_CONT);
3058 else
3059 set_opt(sb, ERRORS_RO);
3060 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3061 set_opt(sb, BLOCK_VALIDITY);
3062 if (def_mount_opts & EXT4_DEFM_DISCARD)
3063 set_opt(sb, DISCARD);
3064
3065 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3066 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3067 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3068 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3069 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3070
3071 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3072 set_opt(sb, BARRIER);
3073
3074 /*
3075 * enable delayed allocation by default
3076 * Use -o nodelalloc to turn it off
3077 */
3078 if (!IS_EXT3_SB(sb) &&
3079 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3080 set_opt(sb, DELALLOC);
3081
3082 /*
3083 * set default s_li_wait_mult for lazyinit, for the case there is
3084 * no mount option specified.
3085 */
3086 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3087
3088 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3089 &journal_devnum, &journal_ioprio, 0)) {
3090 ext4_msg(sb, KERN_WARNING,
3091 "failed to parse options in superblock: %s",
3092 sbi->s_es->s_mount_opts);
3093 }
3094 sbi->s_def_mount_opt = sbi->s_mount_opt;
3095 if (!parse_options((char *) data, sb, &journal_devnum,
3096 &journal_ioprio, 0))
3097 goto failed_mount;
3098
3099 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3100 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3101 "with data=journal disables delayed "
3102 "allocation and O_DIRECT support!\n");
3103 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3104 ext4_msg(sb, KERN_ERR, "can't mount with "
3105 "both data=journal and delalloc");
3106 goto failed_mount;
3107 }
3108 if (test_opt(sb, DIOREAD_NOLOCK)) {
3109 ext4_msg(sb, KERN_ERR, "can't mount with "
3110 "both data=journal and delalloc");
3111 goto failed_mount;
3112 }
3113 if (test_opt(sb, DELALLOC))
3114 clear_opt(sb, DELALLOC);
3115 }
3116
3117 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3118 if (test_opt(sb, DIOREAD_NOLOCK)) {
3119 if (blocksize < PAGE_SIZE) {
3120 ext4_msg(sb, KERN_ERR, "can't mount with "
3121 "dioread_nolock if block size != PAGE_SIZE");
3122 goto failed_mount;
3123 }
3124 }
3125
3126 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3127 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3128
3129 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3130 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3131 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3132 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3133 ext4_msg(sb, KERN_WARNING,
3134 "feature flags set on rev 0 fs, "
3135 "running e2fsck is recommended");
3136
3137 if (IS_EXT2_SB(sb)) {
3138 if (ext2_feature_set_ok(sb))
3139 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3140 "using the ext4 subsystem");
3141 else {
3142 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3143 "to feature incompatibilities");
3144 goto failed_mount;
3145 }
3146 }
3147
3148 if (IS_EXT3_SB(sb)) {
3149 if (ext3_feature_set_ok(sb))
3150 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3151 "using the ext4 subsystem");
3152 else {
3153 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3154 "to feature incompatibilities");
3155 goto failed_mount;
3156 }
3157 }
3158
3159 /*
3160 * Check feature flags regardless of the revision level, since we
3161 * previously didn't change the revision level when setting the flags,
3162 * so there is a chance incompat flags are set on a rev 0 filesystem.
3163 */
3164 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3165 goto failed_mount;
3166
3167 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3168 blocksize > EXT4_MAX_BLOCK_SIZE) {
3169 ext4_msg(sb, KERN_ERR,
3170 "Unsupported filesystem blocksize %d", blocksize);
3171 goto failed_mount;
3172 }
3173
3174 if (sb->s_blocksize != blocksize) {
3175 /* Validate the filesystem blocksize */
3176 if (!sb_set_blocksize(sb, blocksize)) {
3177 ext4_msg(sb, KERN_ERR, "bad block size %d",
3178 blocksize);
3179 goto failed_mount;
3180 }
3181
3182 brelse(bh);
3183 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3184 offset = do_div(logical_sb_block, blocksize);
3185 bh = sb_bread(sb, logical_sb_block);
3186 if (!bh) {
3187 ext4_msg(sb, KERN_ERR,
3188 "Can't read superblock on 2nd try");
3189 goto failed_mount;
3190 }
3191 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3192 sbi->s_es = es;
3193 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3194 ext4_msg(sb, KERN_ERR,
3195 "Magic mismatch, very weird!");
3196 goto failed_mount;
3197 }
3198 }
3199
3200 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3201 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3202 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3203 has_huge_files);
3204 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3205
3206 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3207 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3208 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3209 } else {
3210 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3211 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3212 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3213 (!is_power_of_2(sbi->s_inode_size)) ||
3214 (sbi->s_inode_size > blocksize)) {
3215 ext4_msg(sb, KERN_ERR,
3216 "unsupported inode size: %d",
3217 sbi->s_inode_size);
3218 goto failed_mount;
3219 }
3220 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3221 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3222 }
3223
3224 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3225 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3226 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3227 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3228 !is_power_of_2(sbi->s_desc_size)) {
3229 ext4_msg(sb, KERN_ERR,
3230 "unsupported descriptor size %lu",
3231 sbi->s_desc_size);
3232 goto failed_mount;
3233 }
3234 } else
3235 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3236
3237 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3238 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3239 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3240 goto cantfind_ext4;
3241
3242 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3243 if (sbi->s_inodes_per_block == 0)
3244 goto cantfind_ext4;
3245 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3246 sbi->s_inodes_per_block;
3247 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3248 sbi->s_sbh = bh;
3249 sbi->s_mount_state = le16_to_cpu(es->s_state);
3250 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3251 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3252
3253 for (i = 0; i < 4; i++)
3254 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3255 sbi->s_def_hash_version = es->s_def_hash_version;
3256 i = le32_to_cpu(es->s_flags);
3257 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3258 sbi->s_hash_unsigned = 3;
3259 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3260 #ifdef __CHAR_UNSIGNED__
3261 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3262 sbi->s_hash_unsigned = 3;
3263 #else
3264 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3265 #endif
3266 sb->s_dirt = 1;
3267 }
3268
3269 /* Handle clustersize */
3270 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3271 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3272 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3273 if (has_bigalloc) {
3274 if (clustersize < blocksize) {
3275 ext4_msg(sb, KERN_ERR,
3276 "cluster size (%d) smaller than "
3277 "block size (%d)", clustersize, blocksize);
3278 goto failed_mount;
3279 }
3280 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3281 le32_to_cpu(es->s_log_block_size);
3282 sbi->s_clusters_per_group =
3283 le32_to_cpu(es->s_clusters_per_group);
3284 if (sbi->s_clusters_per_group > blocksize * 8) {
3285 ext4_msg(sb, KERN_ERR,
3286 "#clusters per group too big: %lu",
3287 sbi->s_clusters_per_group);
3288 goto failed_mount;
3289 }
3290 if (sbi->s_blocks_per_group !=
3291 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3292 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3293 "clusters per group (%lu) inconsistent",
3294 sbi->s_blocks_per_group,
3295 sbi->s_clusters_per_group);
3296 goto failed_mount;
3297 }
3298 } else {
3299 if (clustersize != blocksize) {
3300 ext4_warning(sb, "fragment/cluster size (%d) != "
3301 "block size (%d)", clustersize,
3302 blocksize);
3303 clustersize = blocksize;
3304 }
3305 if (sbi->s_blocks_per_group > blocksize * 8) {
3306 ext4_msg(sb, KERN_ERR,
3307 "#blocks per group too big: %lu",
3308 sbi->s_blocks_per_group);
3309 goto failed_mount;
3310 }
3311 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3312 sbi->s_cluster_bits = 0;
3313 }
3314 sbi->s_cluster_ratio = clustersize / blocksize;
3315
3316 if (sbi->s_inodes_per_group > blocksize * 8) {
3317 ext4_msg(sb, KERN_ERR,
3318 "#inodes per group too big: %lu",
3319 sbi->s_inodes_per_group);
3320 goto failed_mount;
3321 }
3322
3323 /*
3324 * Test whether we have more sectors than will fit in sector_t,
3325 * and whether the max offset is addressable by the page cache.
3326 */
3327 err = generic_check_addressable(sb->s_blocksize_bits,
3328 ext4_blocks_count(es));
3329 if (err) {
3330 ext4_msg(sb, KERN_ERR, "filesystem"
3331 " too large to mount safely on this system");
3332 if (sizeof(sector_t) < 8)
3333 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3334 ret = err;
3335 goto failed_mount;
3336 }
3337
3338 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3339 goto cantfind_ext4;
3340
3341 /* check blocks count against device size */
3342 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3343 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3344 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3345 "exceeds size of device (%llu blocks)",
3346 ext4_blocks_count(es), blocks_count);
3347 goto failed_mount;
3348 }
3349
3350 /*
3351 * It makes no sense for the first data block to be beyond the end
3352 * of the filesystem.
3353 */
3354 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3355 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3356 "block %u is beyond end of filesystem (%llu)",
3357 le32_to_cpu(es->s_first_data_block),
3358 ext4_blocks_count(es));
3359 goto failed_mount;
3360 }
3361 blocks_count = (ext4_blocks_count(es) -
3362 le32_to_cpu(es->s_first_data_block) +
3363 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3364 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3365 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3366 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3367 "(block count %llu, first data block %u, "
3368 "blocks per group %lu)", sbi->s_groups_count,
3369 ext4_blocks_count(es),
3370 le32_to_cpu(es->s_first_data_block),
3371 EXT4_BLOCKS_PER_GROUP(sb));
3372 goto failed_mount;
3373 }
3374 sbi->s_groups_count = blocks_count;
3375 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3376 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3377 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3378 EXT4_DESC_PER_BLOCK(sb);
3379 sbi->s_group_desc = ext4_kvmalloc(db_count *
3380 sizeof(struct buffer_head *),
3381 GFP_KERNEL);
3382 if (sbi->s_group_desc == NULL) {
3383 ext4_msg(sb, KERN_ERR, "not enough memory");
3384 goto failed_mount;
3385 }
3386
3387 if (ext4_proc_root)
3388 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3389
3390 if (sbi->s_proc)
3391 proc_create_data("options", S_IRUGO, sbi->s_proc,
3392 &ext4_seq_options_fops, sb);
3393
3394 bgl_lock_init(sbi->s_blockgroup_lock);
3395
3396 for (i = 0; i < db_count; i++) {
3397 block = descriptor_loc(sb, logical_sb_block, i);
3398 sbi->s_group_desc[i] = sb_bread(sb, block);
3399 if (!sbi->s_group_desc[i]) {
3400 ext4_msg(sb, KERN_ERR,
3401 "can't read group descriptor %d", i);
3402 db_count = i;
3403 goto failed_mount2;
3404 }
3405 }
3406 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3407 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3408 goto failed_mount2;
3409 }
3410 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3411 if (!ext4_fill_flex_info(sb)) {
3412 ext4_msg(sb, KERN_ERR,
3413 "unable to initialize "
3414 "flex_bg meta info!");
3415 goto failed_mount2;
3416 }
3417
3418 sbi->s_gdb_count = db_count;
3419 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3420 spin_lock_init(&sbi->s_next_gen_lock);
3421
3422 init_timer(&sbi->s_err_report);
3423 sbi->s_err_report.function = print_daily_error_info;
3424 sbi->s_err_report.data = (unsigned long) sb;
3425
3426 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3427 ext4_count_free_clusters(sb));
3428 if (!err) {
3429 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3430 ext4_count_free_inodes(sb));
3431 }
3432 if (!err) {
3433 err = percpu_counter_init(&sbi->s_dirs_counter,
3434 ext4_count_dirs(sb));
3435 }
3436 if (!err) {
3437 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3438 }
3439 if (err) {
3440 ext4_msg(sb, KERN_ERR, "insufficient memory");
3441 goto failed_mount3;
3442 }
3443
3444 sbi->s_stripe = ext4_get_stripe_size(sbi);
3445 sbi->s_max_writeback_mb_bump = 128;
3446
3447 /*
3448 * set up enough so that it can read an inode
3449 */
3450 if (!test_opt(sb, NOLOAD) &&
3451 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3452 sb->s_op = &ext4_sops;
3453 else
3454 sb->s_op = &ext4_nojournal_sops;
3455 sb->s_export_op = &ext4_export_ops;
3456 sb->s_xattr = ext4_xattr_handlers;
3457 #ifdef CONFIG_QUOTA
3458 sb->s_qcop = &ext4_qctl_operations;
3459 sb->dq_op = &ext4_quota_operations;
3460 #endif
3461 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3462
3463 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3464 mutex_init(&sbi->s_orphan_lock);
3465 sbi->s_resize_flags = 0;
3466
3467 sb->s_root = NULL;
3468
3469 needs_recovery = (es->s_last_orphan != 0 ||
3470 EXT4_HAS_INCOMPAT_FEATURE(sb,
3471 EXT4_FEATURE_INCOMPAT_RECOVER));
3472
3473 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3474 !(sb->s_flags & MS_RDONLY))
3475 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3476 goto failed_mount3;
3477
3478 /*
3479 * The first inode we look at is the journal inode. Don't try
3480 * root first: it may be modified in the journal!
3481 */
3482 if (!test_opt(sb, NOLOAD) &&
3483 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3484 if (ext4_load_journal(sb, es, journal_devnum))
3485 goto failed_mount3;
3486 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3487 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3488 ext4_msg(sb, KERN_ERR, "required journal recovery "
3489 "suppressed and not mounted read-only");
3490 goto failed_mount_wq;
3491 } else {
3492 clear_opt(sb, DATA_FLAGS);
3493 sbi->s_journal = NULL;
3494 needs_recovery = 0;
3495 goto no_journal;
3496 }
3497
3498 if (ext4_blocks_count(es) > 0xffffffffULL &&
3499 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3500 JBD2_FEATURE_INCOMPAT_64BIT)) {
3501 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3502 goto failed_mount_wq;
3503 }
3504
3505 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3506 jbd2_journal_set_features(sbi->s_journal,
3507 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3508 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3509 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3510 jbd2_journal_set_features(sbi->s_journal,
3511 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3512 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3513 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3514 } else {
3515 jbd2_journal_clear_features(sbi->s_journal,
3516 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3517 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3518 }
3519
3520 /* We have now updated the journal if required, so we can
3521 * validate the data journaling mode. */
3522 switch (test_opt(sb, DATA_FLAGS)) {
3523 case 0:
3524 /* No mode set, assume a default based on the journal
3525 * capabilities: ORDERED_DATA if the journal can
3526 * cope, else JOURNAL_DATA
3527 */
3528 if (jbd2_journal_check_available_features
3529 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3530 set_opt(sb, ORDERED_DATA);
3531 else
3532 set_opt(sb, JOURNAL_DATA);
3533 break;
3534
3535 case EXT4_MOUNT_ORDERED_DATA:
3536 case EXT4_MOUNT_WRITEBACK_DATA:
3537 if (!jbd2_journal_check_available_features
3538 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3539 ext4_msg(sb, KERN_ERR, "Journal does not support "
3540 "requested data journaling mode");
3541 goto failed_mount_wq;
3542 }
3543 default:
3544 break;
3545 }
3546 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3547
3548 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3549
3550 /*
3551 * The journal may have updated the bg summary counts, so we
3552 * need to update the global counters.
3553 */
3554 percpu_counter_set(&sbi->s_freeclusters_counter,
3555 ext4_count_free_clusters(sb));
3556 percpu_counter_set(&sbi->s_freeinodes_counter,
3557 ext4_count_free_inodes(sb));
3558 percpu_counter_set(&sbi->s_dirs_counter,
3559 ext4_count_dirs(sb));
3560 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3561
3562 no_journal:
3563 /*
3564 * The maximum number of concurrent works can be high and
3565 * concurrency isn't really necessary. Limit it to 1.
3566 */
3567 EXT4_SB(sb)->dio_unwritten_wq =
3568 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3569 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3570 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3571 goto failed_mount_wq;
3572 }
3573
3574 /*
3575 * The jbd2_journal_load will have done any necessary log recovery,
3576 * so we can safely mount the rest of the filesystem now.
3577 */
3578
3579 root = ext4_iget(sb, EXT4_ROOT_INO);
3580 if (IS_ERR(root)) {
3581 ext4_msg(sb, KERN_ERR, "get root inode failed");
3582 ret = PTR_ERR(root);
3583 root = NULL;
3584 goto failed_mount4;
3585 }
3586 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3587 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3588 iput(root);
3589 goto failed_mount4;
3590 }
3591 sb->s_root = d_alloc_root(root);
3592 if (!sb->s_root) {
3593 iput(root);
3594 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3595 ret = -ENOMEM;
3596 goto failed_mount4;
3597 }
3598
3599 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3600
3601 /* determine the minimum size of new large inodes, if present */
3602 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3603 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3604 EXT4_GOOD_OLD_INODE_SIZE;
3605 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3606 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3607 if (sbi->s_want_extra_isize <
3608 le16_to_cpu(es->s_want_extra_isize))
3609 sbi->s_want_extra_isize =
3610 le16_to_cpu(es->s_want_extra_isize);
3611 if (sbi->s_want_extra_isize <
3612 le16_to_cpu(es->s_min_extra_isize))
3613 sbi->s_want_extra_isize =
3614 le16_to_cpu(es->s_min_extra_isize);
3615 }
3616 }
3617 /* Check if enough inode space is available */
3618 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3619 sbi->s_inode_size) {
3620 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3621 EXT4_GOOD_OLD_INODE_SIZE;
3622 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3623 "available");
3624 }
3625
3626 err = ext4_setup_system_zone(sb);
3627 if (err) {
3628 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3629 "zone (%d)", err);
3630 goto failed_mount4a;
3631 }
3632
3633 ext4_ext_init(sb);
3634 err = ext4_mb_init(sb, needs_recovery);
3635 if (err) {
3636 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3637 err);
3638 goto failed_mount5;
3639 }
3640
3641 err = ext4_register_li_request(sb, first_not_zeroed);
3642 if (err)
3643 goto failed_mount6;
3644
3645 sbi->s_kobj.kset = ext4_kset;
3646 init_completion(&sbi->s_kobj_unregister);
3647 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3648 "%s", sb->s_id);
3649 if (err)
3650 goto failed_mount7;
3651
3652 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3653 ext4_orphan_cleanup(sb, es);
3654 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3655 if (needs_recovery) {
3656 ext4_msg(sb, KERN_INFO, "recovery complete");
3657 ext4_mark_recovery_complete(sb, es);
3658 }
3659 if (EXT4_SB(sb)->s_journal) {
3660 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3661 descr = " journalled data mode";
3662 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3663 descr = " ordered data mode";
3664 else
3665 descr = " writeback data mode";
3666 } else
3667 descr = "out journal";
3668
3669 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3670 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3671 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3672
3673 if (es->s_error_count)
3674 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3675
3676 kfree(orig_data);
3677 return 0;
3678
3679 cantfind_ext4:
3680 if (!silent)
3681 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3682 goto failed_mount;
3683
3684 failed_mount7:
3685 ext4_unregister_li_request(sb);
3686 failed_mount6:
3687 ext4_mb_release(sb);
3688 failed_mount5:
3689 ext4_ext_release(sb);
3690 ext4_release_system_zone(sb);
3691 failed_mount4a:
3692 dput(sb->s_root);
3693 sb->s_root = NULL;
3694 failed_mount4:
3695 ext4_msg(sb, KERN_ERR, "mount failed");
3696 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3697 failed_mount_wq:
3698 if (sbi->s_journal) {
3699 jbd2_journal_destroy(sbi->s_journal);
3700 sbi->s_journal = NULL;
3701 }
3702 failed_mount3:
3703 del_timer(&sbi->s_err_report);
3704 if (sbi->s_flex_groups)
3705 ext4_kvfree(sbi->s_flex_groups);
3706 percpu_counter_destroy(&sbi->s_freeclusters_counter);
3707 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3708 percpu_counter_destroy(&sbi->s_dirs_counter);
3709 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
3710 if (sbi->s_mmp_tsk)
3711 kthread_stop(sbi->s_mmp_tsk);
3712 failed_mount2:
3713 for (i = 0; i < db_count; i++)
3714 brelse(sbi->s_group_desc[i]);
3715 ext4_kvfree(sbi->s_group_desc);
3716 failed_mount:
3717 if (sbi->s_proc) {
3718 remove_proc_entry("options", sbi->s_proc);
3719 remove_proc_entry(sb->s_id, ext4_proc_root);
3720 }
3721 #ifdef CONFIG_QUOTA
3722 for (i = 0; i < MAXQUOTAS; i++)
3723 kfree(sbi->s_qf_names[i]);
3724 #endif
3725 ext4_blkdev_remove(sbi);
3726 brelse(bh);
3727 out_fail:
3728 sb->s_fs_info = NULL;
3729 kfree(sbi->s_blockgroup_lock);
3730 kfree(sbi);
3731 out_free_orig:
3732 kfree(orig_data);
3733 return ret;
3734 }
3735
3736 /*
3737 * Setup any per-fs journal parameters now. We'll do this both on
3738 * initial mount, once the journal has been initialised but before we've
3739 * done any recovery; and again on any subsequent remount.
3740 */
3741 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3742 {
3743 struct ext4_sb_info *sbi = EXT4_SB(sb);
3744
3745 journal->j_commit_interval = sbi->s_commit_interval;
3746 journal->j_min_batch_time = sbi->s_min_batch_time;
3747 journal->j_max_batch_time = sbi->s_max_batch_time;
3748
3749 write_lock(&journal->j_state_lock);
3750 if (test_opt(sb, BARRIER))
3751 journal->j_flags |= JBD2_BARRIER;
3752 else
3753 journal->j_flags &= ~JBD2_BARRIER;
3754 if (test_opt(sb, DATA_ERR_ABORT))
3755 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3756 else
3757 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3758 write_unlock(&journal->j_state_lock);
3759 }
3760
3761 static journal_t *ext4_get_journal(struct super_block *sb,
3762 unsigned int journal_inum)
3763 {
3764 struct inode *journal_inode;
3765 journal_t *journal;
3766
3767 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3768
3769 /* First, test for the existence of a valid inode on disk. Bad
3770 * things happen if we iget() an unused inode, as the subsequent
3771 * iput() will try to delete it. */
3772
3773 journal_inode = ext4_iget(sb, journal_inum);
3774 if (IS_ERR(journal_inode)) {
3775 ext4_msg(sb, KERN_ERR, "no journal found");
3776 return NULL;
3777 }
3778 if (!journal_inode->i_nlink) {
3779 make_bad_inode(journal_inode);
3780 iput(journal_inode);
3781 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3782 return NULL;
3783 }
3784
3785 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3786 journal_inode, journal_inode->i_size);
3787 if (!S_ISREG(journal_inode->i_mode)) {
3788 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3789 iput(journal_inode);
3790 return NULL;
3791 }
3792
3793 journal = jbd2_journal_init_inode(journal_inode);
3794 if (!journal) {
3795 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3796 iput(journal_inode);
3797 return NULL;
3798 }
3799 journal->j_private = sb;
3800 ext4_init_journal_params(sb, journal);
3801 return journal;
3802 }
3803
3804 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3805 dev_t j_dev)
3806 {
3807 struct buffer_head *bh;
3808 journal_t *journal;
3809 ext4_fsblk_t start;
3810 ext4_fsblk_t len;
3811 int hblock, blocksize;
3812 ext4_fsblk_t sb_block;
3813 unsigned long offset;
3814 struct ext4_super_block *es;
3815 struct block_device *bdev;
3816
3817 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3818
3819 bdev = ext4_blkdev_get(j_dev, sb);
3820 if (bdev == NULL)
3821 return NULL;
3822
3823 blocksize = sb->s_blocksize;
3824 hblock = bdev_logical_block_size(bdev);
3825 if (blocksize < hblock) {
3826 ext4_msg(sb, KERN_ERR,
3827 "blocksize too small for journal device");
3828 goto out_bdev;
3829 }
3830
3831 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3832 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3833 set_blocksize(bdev, blocksize);
3834 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3835 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3836 "external journal");
3837 goto out_bdev;
3838 }
3839
3840 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3841 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3842 !(le32_to_cpu(es->s_feature_incompat) &
3843 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3844 ext4_msg(sb, KERN_ERR, "external journal has "
3845 "bad superblock");
3846 brelse(bh);
3847 goto out_bdev;
3848 }
3849
3850 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3851 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3852 brelse(bh);
3853 goto out_bdev;
3854 }
3855
3856 len = ext4_blocks_count(es);
3857 start = sb_block + 1;
3858 brelse(bh); /* we're done with the superblock */
3859
3860 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3861 start, len, blocksize);
3862 if (!journal) {
3863 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3864 goto out_bdev;
3865 }
3866 journal->j_private = sb;
3867 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3868 wait_on_buffer(journal->j_sb_buffer);
3869 if (!buffer_uptodate(journal->j_sb_buffer)) {
3870 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3871 goto out_journal;
3872 }
3873 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3874 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3875 "user (unsupported) - %d",
3876 be32_to_cpu(journal->j_superblock->s_nr_users));
3877 goto out_journal;
3878 }
3879 EXT4_SB(sb)->journal_bdev = bdev;
3880 ext4_init_journal_params(sb, journal);
3881 return journal;
3882
3883 out_journal:
3884 jbd2_journal_destroy(journal);
3885 out_bdev:
3886 ext4_blkdev_put(bdev);
3887 return NULL;
3888 }
3889
3890 static int ext4_load_journal(struct super_block *sb,
3891 struct ext4_super_block *es,
3892 unsigned long journal_devnum)
3893 {
3894 journal_t *journal;
3895 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3896 dev_t journal_dev;
3897 int err = 0;
3898 int really_read_only;
3899
3900 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3901
3902 if (journal_devnum &&
3903 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3904 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3905 "numbers have changed");
3906 journal_dev = new_decode_dev(journal_devnum);
3907 } else
3908 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3909
3910 really_read_only = bdev_read_only(sb->s_bdev);
3911
3912 /*
3913 * Are we loading a blank journal or performing recovery after a
3914 * crash? For recovery, we need to check in advance whether we
3915 * can get read-write access to the device.
3916 */
3917 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3918 if (sb->s_flags & MS_RDONLY) {
3919 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3920 "required on readonly filesystem");
3921 if (really_read_only) {
3922 ext4_msg(sb, KERN_ERR, "write access "
3923 "unavailable, cannot proceed");
3924 return -EROFS;
3925 }
3926 ext4_msg(sb, KERN_INFO, "write access will "
3927 "be enabled during recovery");
3928 }
3929 }
3930
3931 if (journal_inum && journal_dev) {
3932 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3933 "and inode journals!");
3934 return -EINVAL;
3935 }
3936
3937 if (journal_inum) {
3938 if (!(journal = ext4_get_journal(sb, journal_inum)))
3939 return -EINVAL;
3940 } else {
3941 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3942 return -EINVAL;
3943 }
3944
3945 if (!(journal->j_flags & JBD2_BARRIER))
3946 ext4_msg(sb, KERN_INFO, "barriers disabled");
3947
3948 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3949 err = jbd2_journal_wipe(journal, !really_read_only);
3950 if (!err) {
3951 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3952 if (save)
3953 memcpy(save, ((char *) es) +
3954 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
3955 err = jbd2_journal_load(journal);
3956 if (save)
3957 memcpy(((char *) es) + EXT4_S_ERR_START,
3958 save, EXT4_S_ERR_LEN);
3959 kfree(save);
3960 }
3961
3962 if (err) {
3963 ext4_msg(sb, KERN_ERR, "error loading journal");
3964 jbd2_journal_destroy(journal);
3965 return err;
3966 }
3967
3968 EXT4_SB(sb)->s_journal = journal;
3969 ext4_clear_journal_err(sb, es);
3970
3971 if (!really_read_only && journal_devnum &&
3972 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3973 es->s_journal_dev = cpu_to_le32(journal_devnum);
3974
3975 /* Make sure we flush the recovery flag to disk. */
3976 ext4_commit_super(sb, 1);
3977 }
3978
3979 return 0;
3980 }
3981
3982 static int ext4_commit_super(struct super_block *sb, int sync)
3983 {
3984 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3985 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3986 int error = 0;
3987
3988 if (!sbh || block_device_ejected(sb))
3989 return error;
3990 if (buffer_write_io_error(sbh)) {
3991 /*
3992 * Oh, dear. A previous attempt to write the
3993 * superblock failed. This could happen because the
3994 * USB device was yanked out. Or it could happen to
3995 * be a transient write error and maybe the block will
3996 * be remapped. Nothing we can do but to retry the
3997 * write and hope for the best.
3998 */
3999 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4000 "superblock detected");
4001 clear_buffer_write_io_error(sbh);
4002 set_buffer_uptodate(sbh);
4003 }
4004 /*
4005 * If the file system is mounted read-only, don't update the
4006 * superblock write time. This avoids updating the superblock
4007 * write time when we are mounting the root file system
4008 * read/only but we need to replay the journal; at that point,
4009 * for people who are east of GMT and who make their clock
4010 * tick in localtime for Windows bug-for-bug compatibility,
4011 * the clock is set in the future, and this will cause e2fsck
4012 * to complain and force a full file system check.
4013 */
4014 if (!(sb->s_flags & MS_RDONLY))
4015 es->s_wtime = cpu_to_le32(get_seconds());
4016 if (sb->s_bdev->bd_part)
4017 es->s_kbytes_written =
4018 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4019 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4020 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4021 else
4022 es->s_kbytes_written =
4023 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4024 ext4_free_blocks_count_set(es,
4025 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4026 &EXT4_SB(sb)->s_freeclusters_counter)));
4027 es->s_free_inodes_count =
4028 cpu_to_le32(percpu_counter_sum_positive(
4029 &EXT4_SB(sb)->s_freeinodes_counter));
4030 sb->s_dirt = 0;
4031 BUFFER_TRACE(sbh, "marking dirty");
4032 mark_buffer_dirty(sbh);
4033 if (sync) {
4034 error = sync_dirty_buffer(sbh);
4035 if (error)
4036 return error;
4037
4038 error = buffer_write_io_error(sbh);
4039 if (error) {
4040 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4041 "superblock");
4042 clear_buffer_write_io_error(sbh);
4043 set_buffer_uptodate(sbh);
4044 }
4045 }
4046 return error;
4047 }
4048
4049 /*
4050 * Have we just finished recovery? If so, and if we are mounting (or
4051 * remounting) the filesystem readonly, then we will end up with a
4052 * consistent fs on disk. Record that fact.
4053 */
4054 static void ext4_mark_recovery_complete(struct super_block *sb,
4055 struct ext4_super_block *es)
4056 {
4057 journal_t *journal = EXT4_SB(sb)->s_journal;
4058
4059 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4060 BUG_ON(journal != NULL);
4061 return;
4062 }
4063 jbd2_journal_lock_updates(journal);
4064 if (jbd2_journal_flush(journal) < 0)
4065 goto out;
4066
4067 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4068 sb->s_flags & MS_RDONLY) {
4069 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4070 ext4_commit_super(sb, 1);
4071 }
4072
4073 out:
4074 jbd2_journal_unlock_updates(journal);
4075 }
4076
4077 /*
4078 * If we are mounting (or read-write remounting) a filesystem whose journal
4079 * has recorded an error from a previous lifetime, move that error to the
4080 * main filesystem now.
4081 */
4082 static void ext4_clear_journal_err(struct super_block *sb,
4083 struct ext4_super_block *es)
4084 {
4085 journal_t *journal;
4086 int j_errno;
4087 const char *errstr;
4088
4089 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4090
4091 journal = EXT4_SB(sb)->s_journal;
4092
4093 /*
4094 * Now check for any error status which may have been recorded in the
4095 * journal by a prior ext4_error() or ext4_abort()
4096 */
4097
4098 j_errno = jbd2_journal_errno(journal);
4099 if (j_errno) {
4100 char nbuf[16];
4101
4102 errstr = ext4_decode_error(sb, j_errno, nbuf);
4103 ext4_warning(sb, "Filesystem error recorded "
4104 "from previous mount: %s", errstr);
4105 ext4_warning(sb, "Marking fs in need of filesystem check.");
4106
4107 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4108 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4109 ext4_commit_super(sb, 1);
4110
4111 jbd2_journal_clear_err(journal);
4112 }
4113 }
4114
4115 /*
4116 * Force the running and committing transactions to commit,
4117 * and wait on the commit.
4118 */
4119 int ext4_force_commit(struct super_block *sb)
4120 {
4121 journal_t *journal;
4122 int ret = 0;
4123
4124 if (sb->s_flags & MS_RDONLY)
4125 return 0;
4126
4127 journal = EXT4_SB(sb)->s_journal;
4128 if (journal) {
4129 vfs_check_frozen(sb, SB_FREEZE_TRANS);
4130 ret = ext4_journal_force_commit(journal);
4131 }
4132
4133 return ret;
4134 }
4135
4136 static void ext4_write_super(struct super_block *sb)
4137 {
4138 lock_super(sb);
4139 ext4_commit_super(sb, 1);
4140 unlock_super(sb);
4141 }
4142
4143 static int ext4_sync_fs(struct super_block *sb, int wait)
4144 {
4145 int ret = 0;
4146 tid_t target;
4147 struct ext4_sb_info *sbi = EXT4_SB(sb);
4148
4149 trace_ext4_sync_fs(sb, wait);
4150 flush_workqueue(sbi->dio_unwritten_wq);
4151 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4152 if (wait)
4153 jbd2_log_wait_commit(sbi->s_journal, target);
4154 }
4155 return ret;
4156 }
4157
4158 /*
4159 * LVM calls this function before a (read-only) snapshot is created. This
4160 * gives us a chance to flush the journal completely and mark the fs clean.
4161 *
4162 * Note that only this function cannot bring a filesystem to be in a clean
4163 * state independently, because ext4 prevents a new handle from being started
4164 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4165 * the upper layer.
4166 */
4167 static int ext4_freeze(struct super_block *sb)
4168 {
4169 int error = 0;
4170 journal_t *journal;
4171
4172 if (sb->s_flags & MS_RDONLY)
4173 return 0;
4174
4175 journal = EXT4_SB(sb)->s_journal;
4176
4177 /* Now we set up the journal barrier. */
4178 jbd2_journal_lock_updates(journal);
4179
4180 /*
4181 * Don't clear the needs_recovery flag if we failed to flush
4182 * the journal.
4183 */
4184 error = jbd2_journal_flush(journal);
4185 if (error < 0)
4186 goto out;
4187
4188 /* Journal blocked and flushed, clear needs_recovery flag. */
4189 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4190 error = ext4_commit_super(sb, 1);
4191 out:
4192 /* we rely on s_frozen to stop further updates */
4193 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4194 return error;
4195 }
4196
4197 /*
4198 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4199 * flag here, even though the filesystem is not technically dirty yet.
4200 */
4201 static int ext4_unfreeze(struct super_block *sb)
4202 {
4203 if (sb->s_flags & MS_RDONLY)
4204 return 0;
4205
4206 lock_super(sb);
4207 /* Reset the needs_recovery flag before the fs is unlocked. */
4208 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4209 ext4_commit_super(sb, 1);
4210 unlock_super(sb);
4211 return 0;
4212 }
4213
4214 /*
4215 * Structure to save mount options for ext4_remount's benefit
4216 */
4217 struct ext4_mount_options {
4218 unsigned long s_mount_opt;
4219 unsigned long s_mount_opt2;
4220 uid_t s_resuid;
4221 gid_t s_resgid;
4222 unsigned long s_commit_interval;
4223 u32 s_min_batch_time, s_max_batch_time;
4224 #ifdef CONFIG_QUOTA
4225 int s_jquota_fmt;
4226 char *s_qf_names[MAXQUOTAS];
4227 #endif
4228 };
4229
4230 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4231 {
4232 struct ext4_super_block *es;
4233 struct ext4_sb_info *sbi = EXT4_SB(sb);
4234 unsigned long old_sb_flags;
4235 struct ext4_mount_options old_opts;
4236 int enable_quota = 0;
4237 ext4_group_t g;
4238 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4239 int err = 0;
4240 #ifdef CONFIG_QUOTA
4241 int i;
4242 #endif
4243 char *orig_data = kstrdup(data, GFP_KERNEL);
4244
4245 /* Store the original options */
4246 lock_super(sb);
4247 old_sb_flags = sb->s_flags;
4248 old_opts.s_mount_opt = sbi->s_mount_opt;
4249 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4250 old_opts.s_resuid = sbi->s_resuid;
4251 old_opts.s_resgid = sbi->s_resgid;
4252 old_opts.s_commit_interval = sbi->s_commit_interval;
4253 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4254 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4255 #ifdef CONFIG_QUOTA
4256 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4257 for (i = 0; i < MAXQUOTAS; i++)
4258 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4259 #endif
4260 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4261 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4262
4263 /*
4264 * Allow the "check" option to be passed as a remount option.
4265 */
4266 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4267 err = -EINVAL;
4268 goto restore_opts;
4269 }
4270
4271 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4272 ext4_abort(sb, "Abort forced by user");
4273
4274 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4275 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4276
4277 es = sbi->s_es;
4278
4279 if (sbi->s_journal) {
4280 ext4_init_journal_params(sb, sbi->s_journal);
4281 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4282 }
4283
4284 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4285 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4286 err = -EROFS;
4287 goto restore_opts;
4288 }
4289
4290 if (*flags & MS_RDONLY) {
4291 err = dquot_suspend(sb, -1);
4292 if (err < 0)
4293 goto restore_opts;
4294
4295 /*
4296 * First of all, the unconditional stuff we have to do
4297 * to disable replay of the journal when we next remount
4298 */
4299 sb->s_flags |= MS_RDONLY;
4300
4301 /*
4302 * OK, test if we are remounting a valid rw partition
4303 * readonly, and if so set the rdonly flag and then
4304 * mark the partition as valid again.
4305 */
4306 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4307 (sbi->s_mount_state & EXT4_VALID_FS))
4308 es->s_state = cpu_to_le16(sbi->s_mount_state);
4309
4310 if (sbi->s_journal)
4311 ext4_mark_recovery_complete(sb, es);
4312 } else {
4313 /* Make sure we can mount this feature set readwrite */
4314 if (!ext4_feature_set_ok(sb, 0)) {
4315 err = -EROFS;
4316 goto restore_opts;
4317 }
4318 /*
4319 * Make sure the group descriptor checksums
4320 * are sane. If they aren't, refuse to remount r/w.
4321 */
4322 for (g = 0; g < sbi->s_groups_count; g++) {
4323 struct ext4_group_desc *gdp =
4324 ext4_get_group_desc(sb, g, NULL);
4325
4326 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
4327 ext4_msg(sb, KERN_ERR,
4328 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4329 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4330 le16_to_cpu(gdp->bg_checksum));
4331 err = -EINVAL;
4332 goto restore_opts;
4333 }
4334 }
4335
4336 /*
4337 * If we have an unprocessed orphan list hanging
4338 * around from a previously readonly bdev mount,
4339 * require a full umount/remount for now.
4340 */
4341 if (es->s_last_orphan) {
4342 ext4_msg(sb, KERN_WARNING, "Couldn't "
4343 "remount RDWR because of unprocessed "
4344 "orphan inode list. Please "
4345 "umount/remount instead");
4346 err = -EINVAL;
4347 goto restore_opts;
4348 }
4349
4350 /*
4351 * Mounting a RDONLY partition read-write, so reread
4352 * and store the current valid flag. (It may have
4353 * been changed by e2fsck since we originally mounted
4354 * the partition.)
4355 */
4356 if (sbi->s_journal)
4357 ext4_clear_journal_err(sb, es);
4358 sbi->s_mount_state = le16_to_cpu(es->s_state);
4359 if (!ext4_setup_super(sb, es, 0))
4360 sb->s_flags &= ~MS_RDONLY;
4361 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4362 EXT4_FEATURE_INCOMPAT_MMP))
4363 if (ext4_multi_mount_protect(sb,
4364 le64_to_cpu(es->s_mmp_block))) {
4365 err = -EROFS;
4366 goto restore_opts;
4367 }
4368 enable_quota = 1;
4369 }
4370 }
4371
4372 /*
4373 * Reinitialize lazy itable initialization thread based on
4374 * current settings
4375 */
4376 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4377 ext4_unregister_li_request(sb);
4378 else {
4379 ext4_group_t first_not_zeroed;
4380 first_not_zeroed = ext4_has_uninit_itable(sb);
4381 ext4_register_li_request(sb, first_not_zeroed);
4382 }
4383
4384 ext4_setup_system_zone(sb);
4385 if (sbi->s_journal == NULL)
4386 ext4_commit_super(sb, 1);
4387
4388 #ifdef CONFIG_QUOTA
4389 /* Release old quota file names */
4390 for (i = 0; i < MAXQUOTAS; i++)
4391 if (old_opts.s_qf_names[i] &&
4392 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4393 kfree(old_opts.s_qf_names[i]);
4394 #endif
4395 unlock_super(sb);
4396 if (enable_quota)
4397 dquot_resume(sb, -1);
4398
4399 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4400 kfree(orig_data);
4401 return 0;
4402
4403 restore_opts:
4404 sb->s_flags = old_sb_flags;
4405 sbi->s_mount_opt = old_opts.s_mount_opt;
4406 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4407 sbi->s_resuid = old_opts.s_resuid;
4408 sbi->s_resgid = old_opts.s_resgid;
4409 sbi->s_commit_interval = old_opts.s_commit_interval;
4410 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4411 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4412 #ifdef CONFIG_QUOTA
4413 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4414 for (i = 0; i < MAXQUOTAS; i++) {
4415 if (sbi->s_qf_names[i] &&
4416 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4417 kfree(sbi->s_qf_names[i]);
4418 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4419 }
4420 #endif
4421 unlock_super(sb);
4422 kfree(orig_data);
4423 return err;
4424 }
4425
4426 /*
4427 * Note: calculating the overhead so we can be compatible with
4428 * historical BSD practice is quite difficult in the face of
4429 * clusters/bigalloc. This is because multiple metadata blocks from
4430 * different block group can end up in the same allocation cluster.
4431 * Calculating the exact overhead in the face of clustered allocation
4432 * requires either O(all block bitmaps) in memory or O(number of block
4433 * groups**2) in time. We will still calculate the superblock for
4434 * older file systems --- and if we come across with a bigalloc file
4435 * system with zero in s_overhead_clusters the estimate will be close to
4436 * correct especially for very large cluster sizes --- but for newer
4437 * file systems, it's better to calculate this figure once at mkfs
4438 * time, and store it in the superblock. If the superblock value is
4439 * present (even for non-bigalloc file systems), we will use it.
4440 */
4441 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4442 {
4443 struct super_block *sb = dentry->d_sb;
4444 struct ext4_sb_info *sbi = EXT4_SB(sb);
4445 struct ext4_super_block *es = sbi->s_es;
4446 struct ext4_group_desc *gdp;
4447 u64 fsid;
4448 s64 bfree;
4449
4450 if (test_opt(sb, MINIX_DF)) {
4451 sbi->s_overhead_last = 0;
4452 } else if (es->s_overhead_clusters) {
4453 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
4454 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
4455 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4456 ext4_fsblk_t overhead = 0;
4457
4458 /*
4459 * Compute the overhead (FS structures). This is constant
4460 * for a given filesystem unless the number of block groups
4461 * changes so we cache the previous value until it does.
4462 */
4463
4464 /*
4465 * All of the blocks before first_data_block are
4466 * overhead
4467 */
4468 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4469
4470 /*
4471 * Add the overhead found in each block group
4472 */
4473 for (i = 0; i < ngroups; i++) {
4474 gdp = ext4_get_group_desc(sb, i, NULL);
4475 overhead += ext4_num_overhead_clusters(sb, i, gdp);
4476 cond_resched();
4477 }
4478 sbi->s_overhead_last = overhead;
4479 smp_wmb();
4480 sbi->s_blocks_last = ext4_blocks_count(es);
4481 }
4482
4483 buf->f_type = EXT4_SUPER_MAGIC;
4484 buf->f_bsize = sb->s_blocksize;
4485 buf->f_blocks = (ext4_blocks_count(es) -
4486 EXT4_C2B(sbi, sbi->s_overhead_last));
4487 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4488 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4489 /* prevent underflow in case that few free space is available */
4490 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4491 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4492 if (buf->f_bfree < ext4_r_blocks_count(es))
4493 buf->f_bavail = 0;
4494 buf->f_files = le32_to_cpu(es->s_inodes_count);
4495 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4496 buf->f_namelen = EXT4_NAME_LEN;
4497 fsid = le64_to_cpup((void *)es->s_uuid) ^
4498 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4499 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4500 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4501
4502 return 0;
4503 }
4504
4505 /* Helper function for writing quotas on sync - we need to start transaction
4506 * before quota file is locked for write. Otherwise the are possible deadlocks:
4507 * Process 1 Process 2
4508 * ext4_create() quota_sync()
4509 * jbd2_journal_start() write_dquot()
4510 * dquot_initialize() down(dqio_mutex)
4511 * down(dqio_mutex) jbd2_journal_start()
4512 *
4513 */
4514
4515 #ifdef CONFIG_QUOTA
4516
4517 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4518 {
4519 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4520 }
4521
4522 static int ext4_write_dquot(struct dquot *dquot)
4523 {
4524 int ret, err;
4525 handle_t *handle;
4526 struct inode *inode;
4527
4528 inode = dquot_to_inode(dquot);
4529 handle = ext4_journal_start(inode,
4530 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4531 if (IS_ERR(handle))
4532 return PTR_ERR(handle);
4533 ret = dquot_commit(dquot);
4534 err = ext4_journal_stop(handle);
4535 if (!ret)
4536 ret = err;
4537 return ret;
4538 }
4539
4540 static int ext4_acquire_dquot(struct dquot *dquot)
4541 {
4542 int ret, err;
4543 handle_t *handle;
4544
4545 handle = ext4_journal_start(dquot_to_inode(dquot),
4546 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4547 if (IS_ERR(handle))
4548 return PTR_ERR(handle);
4549 ret = dquot_acquire(dquot);
4550 err = ext4_journal_stop(handle);
4551 if (!ret)
4552 ret = err;
4553 return ret;
4554 }
4555
4556 static int ext4_release_dquot(struct dquot *dquot)
4557 {
4558 int ret, err;
4559 handle_t *handle;
4560
4561 handle = ext4_journal_start(dquot_to_inode(dquot),
4562 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4563 if (IS_ERR(handle)) {
4564 /* Release dquot anyway to avoid endless cycle in dqput() */
4565 dquot_release(dquot);
4566 return PTR_ERR(handle);
4567 }
4568 ret = dquot_release(dquot);
4569 err = ext4_journal_stop(handle);
4570 if (!ret)
4571 ret = err;
4572 return ret;
4573 }
4574
4575 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4576 {
4577 /* Are we journaling quotas? */
4578 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4579 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4580 dquot_mark_dquot_dirty(dquot);
4581 return ext4_write_dquot(dquot);
4582 } else {
4583 return dquot_mark_dquot_dirty(dquot);
4584 }
4585 }
4586
4587 static int ext4_write_info(struct super_block *sb, int type)
4588 {
4589 int ret, err;
4590 handle_t *handle;
4591
4592 /* Data block + inode block */
4593 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4594 if (IS_ERR(handle))
4595 return PTR_ERR(handle);
4596 ret = dquot_commit_info(sb, type);
4597 err = ext4_journal_stop(handle);
4598 if (!ret)
4599 ret = err;
4600 return ret;
4601 }
4602
4603 /*
4604 * Turn on quotas during mount time - we need to find
4605 * the quota file and such...
4606 */
4607 static int ext4_quota_on_mount(struct super_block *sb, int type)
4608 {
4609 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4610 EXT4_SB(sb)->s_jquota_fmt, type);
4611 }
4612
4613 /*
4614 * Standard function to be called on quota_on
4615 */
4616 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4617 struct path *path)
4618 {
4619 int err;
4620
4621 if (!test_opt(sb, QUOTA))
4622 return -EINVAL;
4623
4624 /* Quotafile not on the same filesystem? */
4625 if (path->dentry->d_sb != sb)
4626 return -EXDEV;
4627 /* Journaling quota? */
4628 if (EXT4_SB(sb)->s_qf_names[type]) {
4629 /* Quotafile not in fs root? */
4630 if (path->dentry->d_parent != sb->s_root)
4631 ext4_msg(sb, KERN_WARNING,
4632 "Quota file not on filesystem root. "
4633 "Journaled quota will not work");
4634 }
4635
4636 /*
4637 * When we journal data on quota file, we have to flush journal to see
4638 * all updates to the file when we bypass pagecache...
4639 */
4640 if (EXT4_SB(sb)->s_journal &&
4641 ext4_should_journal_data(path->dentry->d_inode)) {
4642 /*
4643 * We don't need to lock updates but journal_flush() could
4644 * otherwise be livelocked...
4645 */
4646 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4647 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4648 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4649 if (err)
4650 return err;
4651 }
4652
4653 return dquot_quota_on(sb, type, format_id, path);
4654 }
4655
4656 static int ext4_quota_off(struct super_block *sb, int type)
4657 {
4658 struct inode *inode = sb_dqopt(sb)->files[type];
4659 handle_t *handle;
4660
4661 /* Force all delayed allocation blocks to be allocated.
4662 * Caller already holds s_umount sem */
4663 if (test_opt(sb, DELALLOC))
4664 sync_filesystem(sb);
4665
4666 if (!inode)
4667 goto out;
4668
4669 /* Update modification times of quota files when userspace can
4670 * start looking at them */
4671 handle = ext4_journal_start(inode, 1);
4672 if (IS_ERR(handle))
4673 goto out;
4674 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4675 ext4_mark_inode_dirty(handle, inode);
4676 ext4_journal_stop(handle);
4677
4678 out:
4679 return dquot_quota_off(sb, type);
4680 }
4681
4682 /* Read data from quotafile - avoid pagecache and such because we cannot afford
4683 * acquiring the locks... As quota files are never truncated and quota code
4684 * itself serializes the operations (and no one else should touch the files)
4685 * we don't have to be afraid of races */
4686 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
4687 size_t len, loff_t off)
4688 {
4689 struct inode *inode = sb_dqopt(sb)->files[type];
4690 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4691 int err = 0;
4692 int offset = off & (sb->s_blocksize - 1);
4693 int tocopy;
4694 size_t toread;
4695 struct buffer_head *bh;
4696 loff_t i_size = i_size_read(inode);
4697
4698 if (off > i_size)
4699 return 0;
4700 if (off+len > i_size)
4701 len = i_size-off;
4702 toread = len;
4703 while (toread > 0) {
4704 tocopy = sb->s_blocksize - offset < toread ?
4705 sb->s_blocksize - offset : toread;
4706 bh = ext4_bread(NULL, inode, blk, 0, &err);
4707 if (err)
4708 return err;
4709 if (!bh) /* A hole? */
4710 memset(data, 0, tocopy);
4711 else
4712 memcpy(data, bh->b_data+offset, tocopy);
4713 brelse(bh);
4714 offset = 0;
4715 toread -= tocopy;
4716 data += tocopy;
4717 blk++;
4718 }
4719 return len;
4720 }
4721
4722 /* Write to quotafile (we know the transaction is already started and has
4723 * enough credits) */
4724 static ssize_t ext4_quota_write(struct super_block *sb, int type,
4725 const char *data, size_t len, loff_t off)
4726 {
4727 struct inode *inode = sb_dqopt(sb)->files[type];
4728 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
4729 int err = 0;
4730 int offset = off & (sb->s_blocksize - 1);
4731 struct buffer_head *bh;
4732 handle_t *handle = journal_current_handle();
4733
4734 if (EXT4_SB(sb)->s_journal && !handle) {
4735 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4736 " cancelled because transaction is not started",
4737 (unsigned long long)off, (unsigned long long)len);
4738 return -EIO;
4739 }
4740 /*
4741 * Since we account only one data block in transaction credits,
4742 * then it is impossible to cross a block boundary.
4743 */
4744 if (sb->s_blocksize - offset < len) {
4745 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4746 " cancelled because not block aligned",
4747 (unsigned long long)off, (unsigned long long)len);
4748 return -EIO;
4749 }
4750
4751 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4752 bh = ext4_bread(handle, inode, blk, 1, &err);
4753 if (!bh)
4754 goto out;
4755 err = ext4_journal_get_write_access(handle, bh);
4756 if (err) {
4757 brelse(bh);
4758 goto out;
4759 }
4760 lock_buffer(bh);
4761 memcpy(bh->b_data+offset, data, len);
4762 flush_dcache_page(bh->b_page);
4763 unlock_buffer(bh);
4764 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4765 brelse(bh);
4766 out:
4767 if (err) {
4768 mutex_unlock(&inode->i_mutex);
4769 return err;
4770 }
4771 if (inode->i_size < off + len) {
4772 i_size_write(inode, off + len);
4773 EXT4_I(inode)->i_disksize = inode->i_size;
4774 ext4_mark_inode_dirty(handle, inode);
4775 }
4776 mutex_unlock(&inode->i_mutex);
4777 return len;
4778 }
4779
4780 #endif
4781
4782 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4783 const char *dev_name, void *data)
4784 {
4785 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
4786 }
4787
4788 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4789 static inline void register_as_ext2(void)
4790 {
4791 int err = register_filesystem(&ext2_fs_type);
4792 if (err)
4793 printk(KERN_WARNING
4794 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4795 }
4796
4797 static inline void unregister_as_ext2(void)
4798 {
4799 unregister_filesystem(&ext2_fs_type);
4800 }
4801
4802 static inline int ext2_feature_set_ok(struct super_block *sb)
4803 {
4804 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4805 return 0;
4806 if (sb->s_flags & MS_RDONLY)
4807 return 1;
4808 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4809 return 0;
4810 return 1;
4811 }
4812 MODULE_ALIAS("ext2");
4813 #else
4814 static inline void register_as_ext2(void) { }
4815 static inline void unregister_as_ext2(void) { }
4816 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
4817 #endif
4818
4819 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
4820 static inline void register_as_ext3(void)
4821 {
4822 int err = register_filesystem(&ext3_fs_type);
4823 if (err)
4824 printk(KERN_WARNING
4825 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4826 }
4827
4828 static inline void unregister_as_ext3(void)
4829 {
4830 unregister_filesystem(&ext3_fs_type);
4831 }
4832
4833 static inline int ext3_feature_set_ok(struct super_block *sb)
4834 {
4835 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4836 return 0;
4837 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4838 return 0;
4839 if (sb->s_flags & MS_RDONLY)
4840 return 1;
4841 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4842 return 0;
4843 return 1;
4844 }
4845 MODULE_ALIAS("ext3");
4846 #else
4847 static inline void register_as_ext3(void) { }
4848 static inline void unregister_as_ext3(void) { }
4849 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
4850 #endif
4851
4852 static struct file_system_type ext4_fs_type = {
4853 .owner = THIS_MODULE,
4854 .name = "ext4",
4855 .mount = ext4_mount,
4856 .kill_sb = kill_block_super,
4857 .fs_flags = FS_REQUIRES_DEV,
4858 };
4859
4860 static int __init ext4_init_feat_adverts(void)
4861 {
4862 struct ext4_features *ef;
4863 int ret = -ENOMEM;
4864
4865 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4866 if (!ef)
4867 goto out;
4868
4869 ef->f_kobj.kset = ext4_kset;
4870 init_completion(&ef->f_kobj_unregister);
4871 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4872 "features");
4873 if (ret) {
4874 kfree(ef);
4875 goto out;
4876 }
4877
4878 ext4_feat = ef;
4879 ret = 0;
4880 out:
4881 return ret;
4882 }
4883
4884 static void ext4_exit_feat_adverts(void)
4885 {
4886 kobject_put(&ext4_feat->f_kobj);
4887 wait_for_completion(&ext4_feat->f_kobj_unregister);
4888 kfree(ext4_feat);
4889 }
4890
4891 /* Shared across all ext4 file systems */
4892 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4893 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4894
4895 static int __init ext4_init_fs(void)
4896 {
4897 int i, err;
4898
4899 ext4_check_flag_values();
4900
4901 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4902 mutex_init(&ext4__aio_mutex[i]);
4903 init_waitqueue_head(&ext4__ioend_wq[i]);
4904 }
4905
4906 err = ext4_init_pageio();
4907 if (err)
4908 return err;
4909 err = ext4_init_system_zone();
4910 if (err)
4911 goto out6;
4912 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4913 if (!ext4_kset)
4914 goto out5;
4915 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4916
4917 err = ext4_init_feat_adverts();
4918 if (err)
4919 goto out4;
4920
4921 err = ext4_init_mballoc();
4922 if (err)
4923 goto out3;
4924
4925 err = ext4_init_xattr();
4926 if (err)
4927 goto out2;
4928 err = init_inodecache();
4929 if (err)
4930 goto out1;
4931 register_as_ext3();
4932 register_as_ext2();
4933 err = register_filesystem(&ext4_fs_type);
4934 if (err)
4935 goto out;
4936
4937 ext4_li_info = NULL;
4938 mutex_init(&ext4_li_mtx);
4939 return 0;
4940 out:
4941 unregister_as_ext2();
4942 unregister_as_ext3();
4943 destroy_inodecache();
4944 out1:
4945 ext4_exit_xattr();
4946 out2:
4947 ext4_exit_mballoc();
4948 out3:
4949 ext4_exit_feat_adverts();
4950 out4:
4951 if (ext4_proc_root)
4952 remove_proc_entry("fs/ext4", NULL);
4953 kset_unregister(ext4_kset);
4954 out5:
4955 ext4_exit_system_zone();
4956 out6:
4957 ext4_exit_pageio();
4958 return err;
4959 }
4960
4961 static void __exit ext4_exit_fs(void)
4962 {
4963 ext4_destroy_lazyinit_thread();
4964 unregister_as_ext2();
4965 unregister_as_ext3();
4966 unregister_filesystem(&ext4_fs_type);
4967 destroy_inodecache();
4968 ext4_exit_xattr();
4969 ext4_exit_mballoc();
4970 ext4_exit_feat_adverts();
4971 remove_proc_entry("fs/ext4", NULL);
4972 kset_unregister(ext4_kset);
4973 ext4_exit_system_zone();
4974 ext4_exit_pageio();
4975 }
4976
4977 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4978 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4979 MODULE_LICENSE("GPL");
4980 module_init(ext4_init_fs)
4981 module_exit(ext4_exit_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree