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ipv6: add support of equal cost multipath (ECMP)
[linux-2.6.git] / fs / ext4 / super.c
blob7265a0367476a87f0355b17c22b2488f65ec9a5f
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 int ext4_freeze(struct super_block *sb);
78 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
80 static inline int ext2_feature_set_ok(struct super_block *sb);
81 static inline int ext3_feature_set_ok(struct super_block *sb);
82 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block *sb);
85 static void ext4_clear_request_list(void);
86
87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94 };
95 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96 #else
97 #define IS_EXT2_SB(sb) (0)
98 #endif
99
100
101 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102 static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
105 .mount = ext4_mount,
106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108 };
109 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110 #else
111 #define IS_EXT3_SB(sb) (0)
112 #endif
113
114 static int ext4_verify_csum_type(struct super_block *sb,
115 struct ext4_super_block *es)
116 {
117 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
118 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
119 return 1;
120
121 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
122 }
123
124 static __le32 ext4_superblock_csum(struct super_block *sb,
125 struct ext4_super_block *es)
126 {
127 struct ext4_sb_info *sbi = EXT4_SB(sb);
128 int offset = offsetof(struct ext4_super_block, s_checksum);
129 __u32 csum;
130
131 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
132
133 return cpu_to_le32(csum);
134 }
135
136 int ext4_superblock_csum_verify(struct super_block *sb,
137 struct ext4_super_block *es)
138 {
139 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
141 return 1;
142
143 return es->s_checksum == ext4_superblock_csum(sb, es);
144 }
145
146 void ext4_superblock_csum_set(struct super_block *sb,
147 struct ext4_super_block *es)
148 {
149 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
150 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
151 return;
152
153 es->s_checksum = ext4_superblock_csum(sb, es);
154 }
155
156 void *ext4_kvmalloc(size_t size, gfp_t flags)
157 {
158 void *ret;
159
160 ret = kmalloc(size, flags);
161 if (!ret)
162 ret = __vmalloc(size, flags, PAGE_KERNEL);
163 return ret;
164 }
165
166 void *ext4_kvzalloc(size_t size, gfp_t flags)
167 {
168 void *ret;
169
170 ret = kzalloc(size, flags);
171 if (!ret)
172 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
173 return ret;
174 }
175
176 void ext4_kvfree(void *ptr)
177 {
178 if (is_vmalloc_addr(ptr))
179 vfree(ptr);
180 else
181 kfree(ptr);
182
183 }
184
185 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
186 struct ext4_group_desc *bg)
187 {
188 return le32_to_cpu(bg->bg_block_bitmap_lo) |
189 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
190 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
191 }
192
193 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
194 struct ext4_group_desc *bg)
195 {
196 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
197 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
198 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
199 }
200
201 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
202 struct ext4_group_desc *bg)
203 {
204 return le32_to_cpu(bg->bg_inode_table_lo) |
205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
206 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
207 }
208
209 __u32 ext4_free_group_clusters(struct super_block *sb,
210 struct ext4_group_desc *bg)
211 {
212 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
214 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
215 }
216
217 __u32 ext4_free_inodes_count(struct super_block *sb,
218 struct ext4_group_desc *bg)
219 {
220 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
222 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
223 }
224
225 __u32 ext4_used_dirs_count(struct super_block *sb,
226 struct ext4_group_desc *bg)
227 {
228 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
230 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
231 }
232
233 __u32 ext4_itable_unused_count(struct super_block *sb,
234 struct ext4_group_desc *bg)
235 {
236 return le16_to_cpu(bg->bg_itable_unused_lo) |
237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
238 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
239 }
240
241 void ext4_block_bitmap_set(struct super_block *sb,
242 struct ext4_group_desc *bg, ext4_fsblk_t blk)
243 {
244 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
245 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
246 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
247 }
248
249 void ext4_inode_bitmap_set(struct super_block *sb,
250 struct ext4_group_desc *bg, ext4_fsblk_t blk)
251 {
252 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
253 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
254 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
255 }
256
257 void ext4_inode_table_set(struct super_block *sb,
258 struct ext4_group_desc *bg, ext4_fsblk_t blk)
259 {
260 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
262 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
263 }
264
265 void ext4_free_group_clusters_set(struct super_block *sb,
266 struct ext4_group_desc *bg, __u32 count)
267 {
268 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
270 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
271 }
272
273 void ext4_free_inodes_set(struct super_block *sb,
274 struct ext4_group_desc *bg, __u32 count)
275 {
276 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
278 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
279 }
280
281 void ext4_used_dirs_set(struct super_block *sb,
282 struct ext4_group_desc *bg, __u32 count)
283 {
284 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
286 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
287 }
288
289 void ext4_itable_unused_set(struct super_block *sb,
290 struct ext4_group_desc *bg, __u32 count)
291 {
292 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
294 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
295 }
296
297
298 /* Just increment the non-pointer handle value */
299 static handle_t *ext4_get_nojournal(void)
300 {
301 handle_t *handle = current->journal_info;
302 unsigned long ref_cnt = (unsigned long)handle;
303
304 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
305
306 ref_cnt++;
307 handle = (handle_t *)ref_cnt;
308
309 current->journal_info = handle;
310 return handle;
311 }
312
313
314 /* Decrement the non-pointer handle value */
315 static void ext4_put_nojournal(handle_t *handle)
316 {
317 unsigned long ref_cnt = (unsigned long)handle;
318
319 BUG_ON(ref_cnt == 0);
320
321 ref_cnt--;
322 handle = (handle_t *)ref_cnt;
323
324 current->journal_info = handle;
325 }
326
327 /*
328 * Wrappers for jbd2_journal_start/end.
329 */
330 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
331 {
332 journal_t *journal;
333
334 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
335 if (sb->s_flags & MS_RDONLY)
336 return ERR_PTR(-EROFS);
337
338 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
339 journal = EXT4_SB(sb)->s_journal;
340 if (!journal)
341 return ext4_get_nojournal();
342 /*
343 * Special case here: if the journal has aborted behind our
344 * backs (eg. EIO in the commit thread), then we still need to
345 * take the FS itself readonly cleanly.
346 */
347 if (is_journal_aborted(journal)) {
348 ext4_abort(sb, "Detected aborted journal");
349 return ERR_PTR(-EROFS);
350 }
351 return jbd2_journal_start(journal, nblocks);
352 }
353
354 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
355 {
356 struct super_block *sb;
357 int err;
358 int rc;
359
360 if (!ext4_handle_valid(handle)) {
361 ext4_put_nojournal(handle);
362 return 0;
363 }
364 sb = handle->h_transaction->t_journal->j_private;
365 err = handle->h_err;
366 rc = jbd2_journal_stop(handle);
367
368 if (!err)
369 err = rc;
370 if (err)
371 __ext4_std_error(sb, where, line, err);
372 return err;
373 }
374
375 void ext4_journal_abort_handle(const char *caller, unsigned int line,
376 const char *err_fn, struct buffer_head *bh,
377 handle_t *handle, int err)
378 {
379 char nbuf[16];
380 const char *errstr = ext4_decode_error(NULL, err, nbuf);
381
382 BUG_ON(!ext4_handle_valid(handle));
383
384 if (bh)
385 BUFFER_TRACE(bh, "abort");
386
387 if (!handle->h_err)
388 handle->h_err = err;
389
390 if (is_handle_aborted(handle))
391 return;
392
393 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
394 caller, line, errstr, err_fn);
395
396 jbd2_journal_abort_handle(handle);
397 }
398
399 static void __save_error_info(struct super_block *sb, const char *func,
400 unsigned int line)
401 {
402 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
403
404 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
405 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
406 es->s_last_error_time = cpu_to_le32(get_seconds());
407 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
408 es->s_last_error_line = cpu_to_le32(line);
409 if (!es->s_first_error_time) {
410 es->s_first_error_time = es->s_last_error_time;
411 strncpy(es->s_first_error_func, func,
412 sizeof(es->s_first_error_func));
413 es->s_first_error_line = cpu_to_le32(line);
414 es->s_first_error_ino = es->s_last_error_ino;
415 es->s_first_error_block = es->s_last_error_block;
416 }
417 /*
418 * Start the daily error reporting function if it hasn't been
419 * started already
420 */
421 if (!es->s_error_count)
422 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
423 le32_add_cpu(&es->s_error_count, 1);
424 }
425
426 static void save_error_info(struct super_block *sb, const char *func,
427 unsigned int line)
428 {
429 __save_error_info(sb, func, line);
430 ext4_commit_super(sb, 1);
431 }
432
433 /*
434 * The del_gendisk() function uninitializes the disk-specific data
435 * structures, including the bdi structure, without telling anyone
436 * else. Once this happens, any attempt to call mark_buffer_dirty()
437 * (for example, by ext4_commit_super), will cause a kernel OOPS.
438 * This is a kludge to prevent these oops until we can put in a proper
439 * hook in del_gendisk() to inform the VFS and file system layers.
440 */
441 static int block_device_ejected(struct super_block *sb)
442 {
443 struct inode *bd_inode = sb->s_bdev->bd_inode;
444 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
445
446 return bdi->dev == NULL;
447 }
448
449 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
450 {
451 struct super_block *sb = journal->j_private;
452 struct ext4_sb_info *sbi = EXT4_SB(sb);
453 int error = is_journal_aborted(journal);
454 struct ext4_journal_cb_entry *jce, *tmp;
455
456 spin_lock(&sbi->s_md_lock);
457 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
458 list_del_init(&jce->jce_list);
459 spin_unlock(&sbi->s_md_lock);
460 jce->jce_func(sb, jce, error);
461 spin_lock(&sbi->s_md_lock);
462 }
463 spin_unlock(&sbi->s_md_lock);
464 }
465
466 /* Deal with the reporting of failure conditions on a filesystem such as
467 * inconsistencies detected or read IO failures.
468 *
469 * On ext2, we can store the error state of the filesystem in the
470 * superblock. That is not possible on ext4, because we may have other
471 * write ordering constraints on the superblock which prevent us from
472 * writing it out straight away; and given that the journal is about to
473 * be aborted, we can't rely on the current, or future, transactions to
474 * write out the superblock safely.
475 *
476 * We'll just use the jbd2_journal_abort() error code to record an error in
477 * the journal instead. On recovery, the journal will complain about
478 * that error until we've noted it down and cleared it.
479 */
480
481 static void ext4_handle_error(struct super_block *sb)
482 {
483 if (sb->s_flags & MS_RDONLY)
484 return;
485
486 if (!test_opt(sb, ERRORS_CONT)) {
487 journal_t *journal = EXT4_SB(sb)->s_journal;
488
489 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
490 if (journal)
491 jbd2_journal_abort(journal, -EIO);
492 }
493 if (test_opt(sb, ERRORS_RO)) {
494 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
495 sb->s_flags |= MS_RDONLY;
496 }
497 if (test_opt(sb, ERRORS_PANIC))
498 panic("EXT4-fs (device %s): panic forced after error\n",
499 sb->s_id);
500 }
501
502 void __ext4_error(struct super_block *sb, const char *function,
503 unsigned int line, const char *fmt, ...)
504 {
505 struct va_format vaf;
506 va_list args;
507
508 va_start(args, fmt);
509 vaf.fmt = fmt;
510 vaf.va = &args;
511 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
512 sb->s_id, function, line, current->comm, &vaf);
513 va_end(args);
514 save_error_info(sb, function, line);
515
516 ext4_handle_error(sb);
517 }
518
519 void ext4_error_inode(struct inode *inode, const char *function,
520 unsigned int line, ext4_fsblk_t block,
521 const char *fmt, ...)
522 {
523 va_list args;
524 struct va_format vaf;
525 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
526
527 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
528 es->s_last_error_block = cpu_to_le64(block);
529 save_error_info(inode->i_sb, function, line);
530 va_start(args, fmt);
531 vaf.fmt = fmt;
532 vaf.va = &args;
533 if (block)
534 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
535 "inode #%lu: block %llu: comm %s: %pV\n",
536 inode->i_sb->s_id, function, line, inode->i_ino,
537 block, current->comm, &vaf);
538 else
539 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
540 "inode #%lu: comm %s: %pV\n",
541 inode->i_sb->s_id, function, line, inode->i_ino,
542 current->comm, &vaf);
543 va_end(args);
544
545 ext4_handle_error(inode->i_sb);
546 }
547
548 void ext4_error_file(struct file *file, const char *function,
549 unsigned int line, ext4_fsblk_t block,
550 const char *fmt, ...)
551 {
552 va_list args;
553 struct va_format vaf;
554 struct ext4_super_block *es;
555 struct inode *inode = file->f_dentry->d_inode;
556 char pathname[80], *path;
557
558 es = EXT4_SB(inode->i_sb)->s_es;
559 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
560 save_error_info(inode->i_sb, function, line);
561 path = d_path(&(file->f_path), pathname, sizeof(pathname));
562 if (IS_ERR(path))
563 path = "(unknown)";
564 va_start(args, fmt);
565 vaf.fmt = fmt;
566 vaf.va = &args;
567 if (block)
568 printk(KERN_CRIT
569 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
570 "block %llu: comm %s: path %s: %pV\n",
571 inode->i_sb->s_id, function, line, inode->i_ino,
572 block, current->comm, path, &vaf);
573 else
574 printk(KERN_CRIT
575 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
576 "comm %s: path %s: %pV\n",
577 inode->i_sb->s_id, function, line, inode->i_ino,
578 current->comm, path, &vaf);
579 va_end(args);
580
581 ext4_handle_error(inode->i_sb);
582 }
583
584 static const char *ext4_decode_error(struct super_block *sb, int errno,
585 char nbuf[16])
586 {
587 char *errstr = NULL;
588
589 switch (errno) {
590 case -EIO:
591 errstr = "IO failure";
592 break;
593 case -ENOMEM:
594 errstr = "Out of memory";
595 break;
596 case -EROFS:
597 if (!sb || (EXT4_SB(sb)->s_journal &&
598 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
599 errstr = "Journal has aborted";
600 else
601 errstr = "Readonly filesystem";
602 break;
603 default:
604 /* If the caller passed in an extra buffer for unknown
605 * errors, textualise them now. Else we just return
606 * NULL. */
607 if (nbuf) {
608 /* Check for truncated error codes... */
609 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
610 errstr = nbuf;
611 }
612 break;
613 }
614
615 return errstr;
616 }
617
618 /* __ext4_std_error decodes expected errors from journaling functions
619 * automatically and invokes the appropriate error response. */
620
621 void __ext4_std_error(struct super_block *sb, const char *function,
622 unsigned int line, int errno)
623 {
624 char nbuf[16];
625 const char *errstr;
626
627 /* Special case: if the error is EROFS, and we're not already
628 * inside a transaction, then there's really no point in logging
629 * an error. */
630 if (errno == -EROFS && journal_current_handle() == NULL &&
631 (sb->s_flags & MS_RDONLY))
632 return;
633
634 errstr = ext4_decode_error(sb, errno, nbuf);
635 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
636 sb->s_id, function, line, errstr);
637 save_error_info(sb, function, line);
638
639 ext4_handle_error(sb);
640 }
641
642 /*
643 * ext4_abort is a much stronger failure handler than ext4_error. The
644 * abort function may be used to deal with unrecoverable failures such
645 * as journal IO errors or ENOMEM at a critical moment in log management.
646 *
647 * We unconditionally force the filesystem into an ABORT|READONLY state,
648 * unless the error response on the fs has been set to panic in which
649 * case we take the easy way out and panic immediately.
650 */
651
652 void __ext4_abort(struct super_block *sb, const char *function,
653 unsigned int line, const char *fmt, ...)
654 {
655 va_list args;
656
657 save_error_info(sb, function, line);
658 va_start(args, fmt);
659 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
660 function, line);
661 vprintk(fmt, args);
662 printk("\n");
663 va_end(args);
664
665 if ((sb->s_flags & MS_RDONLY) == 0) {
666 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
667 sb->s_flags |= MS_RDONLY;
668 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
669 if (EXT4_SB(sb)->s_journal)
670 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
671 save_error_info(sb, function, line);
672 }
673 if (test_opt(sb, ERRORS_PANIC))
674 panic("EXT4-fs panic from previous error\n");
675 }
676
677 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
678 {
679 struct va_format vaf;
680 va_list args;
681
682 va_start(args, fmt);
683 vaf.fmt = fmt;
684 vaf.va = &args;
685 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
686 va_end(args);
687 }
688
689 void __ext4_warning(struct super_block *sb, const char *function,
690 unsigned int line, const char *fmt, ...)
691 {
692 struct va_format vaf;
693 va_list args;
694
695 va_start(args, fmt);
696 vaf.fmt = fmt;
697 vaf.va = &args;
698 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
699 sb->s_id, function, line, &vaf);
700 va_end(args);
701 }
702
703 void __ext4_grp_locked_error(const char *function, unsigned int line,
704 struct super_block *sb, ext4_group_t grp,
705 unsigned long ino, ext4_fsblk_t block,
706 const char *fmt, ...)
707 __releases(bitlock)
708 __acquires(bitlock)
709 {
710 struct va_format vaf;
711 va_list args;
712 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
713
714 es->s_last_error_ino = cpu_to_le32(ino);
715 es->s_last_error_block = cpu_to_le64(block);
716 __save_error_info(sb, function, line);
717
718 va_start(args, fmt);
719
720 vaf.fmt = fmt;
721 vaf.va = &args;
722 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
723 sb->s_id, function, line, grp);
724 if (ino)
725 printk(KERN_CONT "inode %lu: ", ino);
726 if (block)
727 printk(KERN_CONT "block %llu:", (unsigned long long) block);
728 printk(KERN_CONT "%pV\n", &vaf);
729 va_end(args);
730
731 if (test_opt(sb, ERRORS_CONT)) {
732 ext4_commit_super(sb, 0);
733 return;
734 }
735
736 ext4_unlock_group(sb, grp);
737 ext4_handle_error(sb);
738 /*
739 * We only get here in the ERRORS_RO case; relocking the group
740 * may be dangerous, but nothing bad will happen since the
741 * filesystem will have already been marked read/only and the
742 * journal has been aborted. We return 1 as a hint to callers
743 * who might what to use the return value from
744 * ext4_grp_locked_error() to distinguish between the
745 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
746 * aggressively from the ext4 function in question, with a
747 * more appropriate error code.
748 */
749 ext4_lock_group(sb, grp);
750 return;
751 }
752
753 void ext4_update_dynamic_rev(struct super_block *sb)
754 {
755 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
756
757 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
758 return;
759
760 ext4_warning(sb,
761 "updating to rev %d because of new feature flag, "
762 "running e2fsck is recommended",
763 EXT4_DYNAMIC_REV);
764
765 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
766 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
767 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
768 /* leave es->s_feature_*compat flags alone */
769 /* es->s_uuid will be set by e2fsck if empty */
770
771 /*
772 * The rest of the superblock fields should be zero, and if not it
773 * means they are likely already in use, so leave them alone. We
774 * can leave it up to e2fsck to clean up any inconsistencies there.
775 */
776 }
777
778 /*
779 * Open the external journal device
780 */
781 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
782 {
783 struct block_device *bdev;
784 char b[BDEVNAME_SIZE];
785
786 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
787 if (IS_ERR(bdev))
788 goto fail;
789 return bdev;
790
791 fail:
792 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
793 __bdevname(dev, b), PTR_ERR(bdev));
794 return NULL;
795 }
796
797 /*
798 * Release the journal device
799 */
800 static int ext4_blkdev_put(struct block_device *bdev)
801 {
802 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
803 }
804
805 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
806 {
807 struct block_device *bdev;
808 int ret = -ENODEV;
809
810 bdev = sbi->journal_bdev;
811 if (bdev) {
812 ret = ext4_blkdev_put(bdev);
813 sbi->journal_bdev = NULL;
814 }
815 return ret;
816 }
817
818 static inline struct inode *orphan_list_entry(struct list_head *l)
819 {
820 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
821 }
822
823 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
824 {
825 struct list_head *l;
826
827 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
828 le32_to_cpu(sbi->s_es->s_last_orphan));
829
830 printk(KERN_ERR "sb_info orphan list:\n");
831 list_for_each(l, &sbi->s_orphan) {
832 struct inode *inode = orphan_list_entry(l);
833 printk(KERN_ERR " "
834 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
835 inode->i_sb->s_id, inode->i_ino, inode,
836 inode->i_mode, inode->i_nlink,
837 NEXT_ORPHAN(inode));
838 }
839 }
840
841 static void ext4_put_super(struct super_block *sb)
842 {
843 struct ext4_sb_info *sbi = EXT4_SB(sb);
844 struct ext4_super_block *es = sbi->s_es;
845 int i, err;
846
847 ext4_unregister_li_request(sb);
848 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
849
850 flush_workqueue(sbi->dio_unwritten_wq);
851 destroy_workqueue(sbi->dio_unwritten_wq);
852
853 if (sbi->s_journal) {
854 err = jbd2_journal_destroy(sbi->s_journal);
855 sbi->s_journal = NULL;
856 if (err < 0)
857 ext4_abort(sb, "Couldn't clean up the journal");
858 }
859
860 del_timer(&sbi->s_err_report);
861 ext4_release_system_zone(sb);
862 ext4_mb_release(sb);
863 ext4_ext_release(sb);
864 ext4_xattr_put_super(sb);
865
866 if (!(sb->s_flags & MS_RDONLY)) {
867 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
868 es->s_state = cpu_to_le16(sbi->s_mount_state);
869 }
870 if (!(sb->s_flags & MS_RDONLY))
871 ext4_commit_super(sb, 1);
872
873 if (sbi->s_proc) {
874 remove_proc_entry("options", sbi->s_proc);
875 remove_proc_entry(sb->s_id, ext4_proc_root);
876 }
877 kobject_del(&sbi->s_kobj);
878
879 for (i = 0; i < sbi->s_gdb_count; i++)
880 brelse(sbi->s_group_desc[i]);
881 ext4_kvfree(sbi->s_group_desc);
882 ext4_kvfree(sbi->s_flex_groups);
883 percpu_counter_destroy(&sbi->s_freeclusters_counter);
884 percpu_counter_destroy(&sbi->s_freeinodes_counter);
885 percpu_counter_destroy(&sbi->s_dirs_counter);
886 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
887 brelse(sbi->s_sbh);
888 #ifdef CONFIG_QUOTA
889 for (i = 0; i < MAXQUOTAS; i++)
890 kfree(sbi->s_qf_names[i]);
891 #endif
892
893 /* Debugging code just in case the in-memory inode orphan list
894 * isn't empty. The on-disk one can be non-empty if we've
895 * detected an error and taken the fs readonly, but the
896 * in-memory list had better be clean by this point. */
897 if (!list_empty(&sbi->s_orphan))
898 dump_orphan_list(sb, sbi);
899 J_ASSERT(list_empty(&sbi->s_orphan));
900
901 invalidate_bdev(sb->s_bdev);
902 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
903 /*
904 * Invalidate the journal device's buffers. We don't want them
905 * floating about in memory - the physical journal device may
906 * hotswapped, and it breaks the `ro-after' testing code.
907 */
908 sync_blockdev(sbi->journal_bdev);
909 invalidate_bdev(sbi->journal_bdev);
910 ext4_blkdev_remove(sbi);
911 }
912 if (sbi->s_mmp_tsk)
913 kthread_stop(sbi->s_mmp_tsk);
914 sb->s_fs_info = NULL;
915 /*
916 * Now that we are completely done shutting down the
917 * superblock, we need to actually destroy the kobject.
918 */
919 kobject_put(&sbi->s_kobj);
920 wait_for_completion(&sbi->s_kobj_unregister);
921 if (sbi->s_chksum_driver)
922 crypto_free_shash(sbi->s_chksum_driver);
923 kfree(sbi->s_blockgroup_lock);
924 kfree(sbi);
925 }
926
927 static struct kmem_cache *ext4_inode_cachep;
928
929 /*
930 * Called inside transaction, so use GFP_NOFS
931 */
932 static struct inode *ext4_alloc_inode(struct super_block *sb)
933 {
934 struct ext4_inode_info *ei;
935
936 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
937 if (!ei)
938 return NULL;
939
940 ei->vfs_inode.i_version = 1;
941 ei->vfs_inode.i_data.writeback_index = 0;
942 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
943 INIT_LIST_HEAD(&ei->i_prealloc_list);
944 spin_lock_init(&ei->i_prealloc_lock);
945 ei->i_reserved_data_blocks = 0;
946 ei->i_reserved_meta_blocks = 0;
947 ei->i_allocated_meta_blocks = 0;
948 ei->i_da_metadata_calc_len = 0;
949 ei->i_da_metadata_calc_last_lblock = 0;
950 spin_lock_init(&(ei->i_block_reservation_lock));
951 #ifdef CONFIG_QUOTA
952 ei->i_reserved_quota = 0;
953 #endif
954 ei->jinode = NULL;
955 INIT_LIST_HEAD(&ei->i_completed_io_list);
956 spin_lock_init(&ei->i_completed_io_lock);
957 ei->i_sync_tid = 0;
958 ei->i_datasync_tid = 0;
959 atomic_set(&ei->i_ioend_count, 0);
960 atomic_set(&ei->i_unwritten, 0);
961
962 return &ei->vfs_inode;
963 }
964
965 static int ext4_drop_inode(struct inode *inode)
966 {
967 int drop = generic_drop_inode(inode);
968
969 trace_ext4_drop_inode(inode, drop);
970 return drop;
971 }
972
973 static void ext4_i_callback(struct rcu_head *head)
974 {
975 struct inode *inode = container_of(head, struct inode, i_rcu);
976 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
977 }
978
979 static void ext4_destroy_inode(struct inode *inode)
980 {
981 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
982 ext4_msg(inode->i_sb, KERN_ERR,
983 "Inode %lu (%p): orphan list check failed!",
984 inode->i_ino, EXT4_I(inode));
985 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
986 EXT4_I(inode), sizeof(struct ext4_inode_info),
987 true);
988 dump_stack();
989 }
990 call_rcu(&inode->i_rcu, ext4_i_callback);
991 }
992
993 static void init_once(void *foo)
994 {
995 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
996
997 INIT_LIST_HEAD(&ei->i_orphan);
998 #ifdef CONFIG_EXT4_FS_XATTR
999 init_rwsem(&ei->xattr_sem);
1000 #endif
1001 init_rwsem(&ei->i_data_sem);
1002 inode_init_once(&ei->vfs_inode);
1003 }
1004
1005 static int init_inodecache(void)
1006 {
1007 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1008 sizeof(struct ext4_inode_info),
1009 0, (SLAB_RECLAIM_ACCOUNT|
1010 SLAB_MEM_SPREAD),
1011 init_once);
1012 if (ext4_inode_cachep == NULL)
1013 return -ENOMEM;
1014 return 0;
1015 }
1016
1017 static void destroy_inodecache(void)
1018 {
1019 /*
1020 * Make sure all delayed rcu free inodes are flushed before we
1021 * destroy cache.
1022 */
1023 rcu_barrier();
1024 kmem_cache_destroy(ext4_inode_cachep);
1025 }
1026
1027 void ext4_clear_inode(struct inode *inode)
1028 {
1029 invalidate_inode_buffers(inode);
1030 clear_inode(inode);
1031 dquot_drop(inode);
1032 ext4_discard_preallocations(inode);
1033 if (EXT4_I(inode)->jinode) {
1034 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1035 EXT4_I(inode)->jinode);
1036 jbd2_free_inode(EXT4_I(inode)->jinode);
1037 EXT4_I(inode)->jinode = NULL;
1038 }
1039 }
1040
1041 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1042 u64 ino, u32 generation)
1043 {
1044 struct inode *inode;
1045
1046 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1047 return ERR_PTR(-ESTALE);
1048 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1049 return ERR_PTR(-ESTALE);
1050
1051 /* iget isn't really right if the inode is currently unallocated!!
1052 *
1053 * ext4_read_inode will return a bad_inode if the inode had been
1054 * deleted, so we should be safe.
1055 *
1056 * Currently we don't know the generation for parent directory, so
1057 * a generation of 0 means "accept any"
1058 */
1059 inode = ext4_iget(sb, ino);
1060 if (IS_ERR(inode))
1061 return ERR_CAST(inode);
1062 if (generation && inode->i_generation != generation) {
1063 iput(inode);
1064 return ERR_PTR(-ESTALE);
1065 }
1066
1067 return inode;
1068 }
1069
1070 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1071 int fh_len, int fh_type)
1072 {
1073 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1074 ext4_nfs_get_inode);
1075 }
1076
1077 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1078 int fh_len, int fh_type)
1079 {
1080 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1081 ext4_nfs_get_inode);
1082 }
1083
1084 /*
1085 * Try to release metadata pages (indirect blocks, directories) which are
1086 * mapped via the block device. Since these pages could have journal heads
1087 * which would prevent try_to_free_buffers() from freeing them, we must use
1088 * jbd2 layer's try_to_free_buffers() function to release them.
1089 */
1090 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1091 gfp_t wait)
1092 {
1093 journal_t *journal = EXT4_SB(sb)->s_journal;
1094
1095 WARN_ON(PageChecked(page));
1096 if (!page_has_buffers(page))
1097 return 0;
1098 if (journal)
1099 return jbd2_journal_try_to_free_buffers(journal, page,
1100 wait & ~__GFP_WAIT);
1101 return try_to_free_buffers(page);
1102 }
1103
1104 #ifdef CONFIG_QUOTA
1105 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1106 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1107
1108 static int ext4_write_dquot(struct dquot *dquot);
1109 static int ext4_acquire_dquot(struct dquot *dquot);
1110 static int ext4_release_dquot(struct dquot *dquot);
1111 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1112 static int ext4_write_info(struct super_block *sb, int type);
1113 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1114 struct path *path);
1115 static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1116 int format_id);
1117 static int ext4_quota_off(struct super_block *sb, int type);
1118 static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1119 static int ext4_quota_on_mount(struct super_block *sb, int type);
1120 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1121 size_t len, loff_t off);
1122 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1123 const char *data, size_t len, loff_t off);
1124 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1125 unsigned int flags);
1126 static int ext4_enable_quotas(struct super_block *sb);
1127
1128 static const struct dquot_operations ext4_quota_operations = {
1129 .get_reserved_space = ext4_get_reserved_space,
1130 .write_dquot = ext4_write_dquot,
1131 .acquire_dquot = ext4_acquire_dquot,
1132 .release_dquot = ext4_release_dquot,
1133 .mark_dirty = ext4_mark_dquot_dirty,
1134 .write_info = ext4_write_info,
1135 .alloc_dquot = dquot_alloc,
1136 .destroy_dquot = dquot_destroy,
1137 };
1138
1139 static const struct quotactl_ops ext4_qctl_operations = {
1140 .quota_on = ext4_quota_on,
1141 .quota_off = ext4_quota_off,
1142 .quota_sync = dquot_quota_sync,
1143 .get_info = dquot_get_dqinfo,
1144 .set_info = dquot_set_dqinfo,
1145 .get_dqblk = dquot_get_dqblk,
1146 .set_dqblk = dquot_set_dqblk
1147 };
1148
1149 static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1150 .quota_on_meta = ext4_quota_on_sysfile,
1151 .quota_off = ext4_quota_off_sysfile,
1152 .quota_sync = dquot_quota_sync,
1153 .get_info = dquot_get_dqinfo,
1154 .set_info = dquot_set_dqinfo,
1155 .get_dqblk = dquot_get_dqblk,
1156 .set_dqblk = dquot_set_dqblk
1157 };
1158 #endif
1159
1160 static const struct super_operations ext4_sops = {
1161 .alloc_inode = ext4_alloc_inode,
1162 .destroy_inode = ext4_destroy_inode,
1163 .write_inode = ext4_write_inode,
1164 .dirty_inode = ext4_dirty_inode,
1165 .drop_inode = ext4_drop_inode,
1166 .evict_inode = ext4_evict_inode,
1167 .put_super = ext4_put_super,
1168 .sync_fs = ext4_sync_fs,
1169 .freeze_fs = ext4_freeze,
1170 .unfreeze_fs = ext4_unfreeze,
1171 .statfs = ext4_statfs,
1172 .remount_fs = ext4_remount,
1173 .show_options = ext4_show_options,
1174 #ifdef CONFIG_QUOTA
1175 .quota_read = ext4_quota_read,
1176 .quota_write = ext4_quota_write,
1177 #endif
1178 .bdev_try_to_free_page = bdev_try_to_free_page,
1179 };
1180
1181 static const struct super_operations ext4_nojournal_sops = {
1182 .alloc_inode = ext4_alloc_inode,
1183 .destroy_inode = ext4_destroy_inode,
1184 .write_inode = ext4_write_inode,
1185 .dirty_inode = ext4_dirty_inode,
1186 .drop_inode = ext4_drop_inode,
1187 .evict_inode = ext4_evict_inode,
1188 .put_super = ext4_put_super,
1189 .statfs = ext4_statfs,
1190 .remount_fs = ext4_remount,
1191 .show_options = ext4_show_options,
1192 #ifdef CONFIG_QUOTA
1193 .quota_read = ext4_quota_read,
1194 .quota_write = ext4_quota_write,
1195 #endif
1196 .bdev_try_to_free_page = bdev_try_to_free_page,
1197 };
1198
1199 static const struct export_operations ext4_export_ops = {
1200 .fh_to_dentry = ext4_fh_to_dentry,
1201 .fh_to_parent = ext4_fh_to_parent,
1202 .get_parent = ext4_get_parent,
1203 };
1204
1205 enum {
1206 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1207 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1208 Opt_nouid32, Opt_debug, Opt_removed,
1209 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1210 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1211 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1212 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1213 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1214 Opt_data_err_abort, Opt_data_err_ignore,
1215 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1216 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1217 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1218 Opt_usrquota, Opt_grpquota, Opt_i_version,
1219 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1220 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1221 Opt_inode_readahead_blks, Opt_journal_ioprio,
1222 Opt_dioread_nolock, Opt_dioread_lock,
1223 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1224 Opt_max_dir_size_kb,
1225 };
1226
1227 static const match_table_t tokens = {
1228 {Opt_bsd_df, "bsddf"},
1229 {Opt_minix_df, "minixdf"},
1230 {Opt_grpid, "grpid"},
1231 {Opt_grpid, "bsdgroups"},
1232 {Opt_nogrpid, "nogrpid"},
1233 {Opt_nogrpid, "sysvgroups"},
1234 {Opt_resgid, "resgid=%u"},
1235 {Opt_resuid, "resuid=%u"},
1236 {Opt_sb, "sb=%u"},
1237 {Opt_err_cont, "errors=continue"},
1238 {Opt_err_panic, "errors=panic"},
1239 {Opt_err_ro, "errors=remount-ro"},
1240 {Opt_nouid32, "nouid32"},
1241 {Opt_debug, "debug"},
1242 {Opt_removed, "oldalloc"},
1243 {Opt_removed, "orlov"},
1244 {Opt_user_xattr, "user_xattr"},
1245 {Opt_nouser_xattr, "nouser_xattr"},
1246 {Opt_acl, "acl"},
1247 {Opt_noacl, "noacl"},
1248 {Opt_noload, "norecovery"},
1249 {Opt_noload, "noload"},
1250 {Opt_removed, "nobh"},
1251 {Opt_removed, "bh"},
1252 {Opt_commit, "commit=%u"},
1253 {Opt_min_batch_time, "min_batch_time=%u"},
1254 {Opt_max_batch_time, "max_batch_time=%u"},
1255 {Opt_journal_dev, "journal_dev=%u"},
1256 {Opt_journal_checksum, "journal_checksum"},
1257 {Opt_journal_async_commit, "journal_async_commit"},
1258 {Opt_abort, "abort"},
1259 {Opt_data_journal, "data=journal"},
1260 {Opt_data_ordered, "data=ordered"},
1261 {Opt_data_writeback, "data=writeback"},
1262 {Opt_data_err_abort, "data_err=abort"},
1263 {Opt_data_err_ignore, "data_err=ignore"},
1264 {Opt_offusrjquota, "usrjquota="},
1265 {Opt_usrjquota, "usrjquota=%s"},
1266 {Opt_offgrpjquota, "grpjquota="},
1267 {Opt_grpjquota, "grpjquota=%s"},
1268 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1269 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1270 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1271 {Opt_grpquota, "grpquota"},
1272 {Opt_noquota, "noquota"},
1273 {Opt_quota, "quota"},
1274 {Opt_usrquota, "usrquota"},
1275 {Opt_barrier, "barrier=%u"},
1276 {Opt_barrier, "barrier"},
1277 {Opt_nobarrier, "nobarrier"},
1278 {Opt_i_version, "i_version"},
1279 {Opt_stripe, "stripe=%u"},
1280 {Opt_delalloc, "delalloc"},
1281 {Opt_nodelalloc, "nodelalloc"},
1282 {Opt_mblk_io_submit, "mblk_io_submit"},
1283 {Opt_nomblk_io_submit, "nomblk_io_submit"},
1284 {Opt_block_validity, "block_validity"},
1285 {Opt_noblock_validity, "noblock_validity"},
1286 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1287 {Opt_journal_ioprio, "journal_ioprio=%u"},
1288 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1289 {Opt_auto_da_alloc, "auto_da_alloc"},
1290 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1291 {Opt_dioread_nolock, "dioread_nolock"},
1292 {Opt_dioread_lock, "dioread_lock"},
1293 {Opt_discard, "discard"},
1294 {Opt_nodiscard, "nodiscard"},
1295 {Opt_init_itable, "init_itable=%u"},
1296 {Opt_init_itable, "init_itable"},
1297 {Opt_noinit_itable, "noinit_itable"},
1298 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1299 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1300 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1301 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1302 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1303 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1304 {Opt_err, NULL},
1305 };
1306
1307 static ext4_fsblk_t get_sb_block(void **data)
1308 {
1309 ext4_fsblk_t sb_block;
1310 char *options = (char *) *data;
1311
1312 if (!options || strncmp(options, "sb=", 3) != 0)
1313 return 1; /* Default location */
1314
1315 options += 3;
1316 /* TODO: use simple_strtoll with >32bit ext4 */
1317 sb_block = simple_strtoul(options, &options, 0);
1318 if (*options && *options != ',') {
1319 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1320 (char *) *data);
1321 return 1;
1322 }
1323 if (*options == ',')
1324 options++;
1325 *data = (void *) options;
1326
1327 return sb_block;
1328 }
1329
1330 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1331 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1332 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1333
1334 #ifdef CONFIG_QUOTA
1335 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1336 {
1337 struct ext4_sb_info *sbi = EXT4_SB(sb);
1338 char *qname;
1339
1340 if (sb_any_quota_loaded(sb) &&
1341 !sbi->s_qf_names[qtype]) {
1342 ext4_msg(sb, KERN_ERR,
1343 "Cannot change journaled "
1344 "quota options when quota turned on");
1345 return -1;
1346 }
1347 qname = match_strdup(args);
1348 if (!qname) {
1349 ext4_msg(sb, KERN_ERR,
1350 "Not enough memory for storing quotafile name");
1351 return -1;
1352 }
1353 if (sbi->s_qf_names[qtype] &&
1354 strcmp(sbi->s_qf_names[qtype], qname)) {
1355 ext4_msg(sb, KERN_ERR,
1356 "%s quota file already specified", QTYPE2NAME(qtype));
1357 kfree(qname);
1358 return -1;
1359 }
1360 sbi->s_qf_names[qtype] = qname;
1361 if (strchr(sbi->s_qf_names[qtype], '/')) {
1362 ext4_msg(sb, KERN_ERR,
1363 "quotafile must be on filesystem root");
1364 kfree(sbi->s_qf_names[qtype]);
1365 sbi->s_qf_names[qtype] = NULL;
1366 return -1;
1367 }
1368 set_opt(sb, QUOTA);
1369 return 1;
1370 }
1371
1372 static int clear_qf_name(struct super_block *sb, int qtype)
1373 {
1374
1375 struct ext4_sb_info *sbi = EXT4_SB(sb);
1376
1377 if (sb_any_quota_loaded(sb) &&
1378 sbi->s_qf_names[qtype]) {
1379 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1380 " when quota turned on");
1381 return -1;
1382 }
1383 /*
1384 * The space will be released later when all options are confirmed
1385 * to be correct
1386 */
1387 sbi->s_qf_names[qtype] = NULL;
1388 return 1;
1389 }
1390 #endif
1391
1392 #define MOPT_SET 0x0001
1393 #define MOPT_CLEAR 0x0002
1394 #define MOPT_NOSUPPORT 0x0004
1395 #define MOPT_EXPLICIT 0x0008
1396 #define MOPT_CLEAR_ERR 0x0010
1397 #define MOPT_GTE0 0x0020
1398 #ifdef CONFIG_QUOTA
1399 #define MOPT_Q 0
1400 #define MOPT_QFMT 0x0040
1401 #else
1402 #define MOPT_Q MOPT_NOSUPPORT
1403 #define MOPT_QFMT MOPT_NOSUPPORT
1404 #endif
1405 #define MOPT_DATAJ 0x0080
1406
1407 static const struct mount_opts {
1408 int token;
1409 int mount_opt;
1410 int flags;
1411 } ext4_mount_opts[] = {
1412 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1413 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1414 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1415 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1416 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1417 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1418 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1419 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1420 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1421 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1422 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1423 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1424 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1425 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1426 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1427 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1428 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1429 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1430 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1431 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1432 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1433 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1434 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1435 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1436 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1437 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1438 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1439 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1440 {Opt_commit, 0, MOPT_GTE0},
1441 {Opt_max_batch_time, 0, MOPT_GTE0},
1442 {Opt_min_batch_time, 0, MOPT_GTE0},
1443 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1444 {Opt_init_itable, 0, MOPT_GTE0},
1445 {Opt_stripe, 0, MOPT_GTE0},
1446 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1447 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1448 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
1449 #ifdef CONFIG_EXT4_FS_XATTR
1450 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1451 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1452 #else
1453 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1454 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
1455 #endif
1456 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1457 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1458 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1459 #else
1460 {Opt_acl, 0, MOPT_NOSUPPORT},
1461 {Opt_noacl, 0, MOPT_NOSUPPORT},
1462 #endif
1463 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1464 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1465 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1466 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1467 MOPT_SET | MOPT_Q},
1468 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1469 MOPT_SET | MOPT_Q},
1470 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1471 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1472 {Opt_usrjquota, 0, MOPT_Q},
1473 {Opt_grpjquota, 0, MOPT_Q},
1474 {Opt_offusrjquota, 0, MOPT_Q},
1475 {Opt_offgrpjquota, 0, MOPT_Q},
1476 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1477 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1478 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1479 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1480 {Opt_err, 0, 0}
1481 };
1482
1483 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1484 substring_t *args, unsigned long *journal_devnum,
1485 unsigned int *journal_ioprio, int is_remount)
1486 {
1487 struct ext4_sb_info *sbi = EXT4_SB(sb);
1488 const struct mount_opts *m;
1489 kuid_t uid;
1490 kgid_t gid;
1491 int arg = 0;
1492
1493 #ifdef CONFIG_QUOTA
1494 if (token == Opt_usrjquota)
1495 return set_qf_name(sb, USRQUOTA, &args[0]);
1496 else if (token == Opt_grpjquota)
1497 return set_qf_name(sb, GRPQUOTA, &args[0]);
1498 else if (token == Opt_offusrjquota)
1499 return clear_qf_name(sb, USRQUOTA);
1500 else if (token == Opt_offgrpjquota)
1501 return clear_qf_name(sb, GRPQUOTA);
1502 #endif
1503 if (args->from && match_int(args, &arg))
1504 return -1;
1505 switch (token) {
1506 case Opt_noacl:
1507 case Opt_nouser_xattr:
1508 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1509 break;
1510 case Opt_sb:
1511 return 1; /* handled by get_sb_block() */
1512 case Opt_removed:
1513 ext4_msg(sb, KERN_WARNING,
1514 "Ignoring removed %s option", opt);
1515 return 1;
1516 case Opt_resuid:
1517 uid = make_kuid(current_user_ns(), arg);
1518 if (!uid_valid(uid)) {
1519 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1520 return -1;
1521 }
1522 sbi->s_resuid = uid;
1523 return 1;
1524 case Opt_resgid:
1525 gid = make_kgid(current_user_ns(), arg);
1526 if (!gid_valid(gid)) {
1527 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1528 return -1;
1529 }
1530 sbi->s_resgid = gid;
1531 return 1;
1532 case Opt_abort:
1533 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1534 return 1;
1535 case Opt_i_version:
1536 sb->s_flags |= MS_I_VERSION;
1537 return 1;
1538 case Opt_journal_dev:
1539 if (is_remount) {
1540 ext4_msg(sb, KERN_ERR,
1541 "Cannot specify journal on remount");
1542 return -1;
1543 }
1544 *journal_devnum = arg;
1545 return 1;
1546 case Opt_journal_ioprio:
1547 if (arg < 0 || arg > 7)
1548 return -1;
1549 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1550 return 1;
1551 }
1552
1553 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1554 if (token != m->token)
1555 continue;
1556 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1557 return -1;
1558 if (m->flags & MOPT_EXPLICIT)
1559 set_opt2(sb, EXPLICIT_DELALLOC);
1560 if (m->flags & MOPT_CLEAR_ERR)
1561 clear_opt(sb, ERRORS_MASK);
1562 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1563 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1564 "options when quota turned on");
1565 return -1;
1566 }
1567
1568 if (m->flags & MOPT_NOSUPPORT) {
1569 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1570 } else if (token == Opt_commit) {
1571 if (arg == 0)
1572 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1573 sbi->s_commit_interval = HZ * arg;
1574 } else if (token == Opt_max_batch_time) {
1575 if (arg == 0)
1576 arg = EXT4_DEF_MAX_BATCH_TIME;
1577 sbi->s_max_batch_time = arg;
1578 } else if (token == Opt_min_batch_time) {
1579 sbi->s_min_batch_time = arg;
1580 } else if (token == Opt_inode_readahead_blks) {
1581 if (arg > (1 << 30))
1582 return -1;
1583 if (arg && !is_power_of_2(arg)) {
1584 ext4_msg(sb, KERN_ERR,
1585 "EXT4-fs: inode_readahead_blks"
1586 " must be a power of 2");
1587 return -1;
1588 }
1589 sbi->s_inode_readahead_blks = arg;
1590 } else if (token == Opt_init_itable) {
1591 set_opt(sb, INIT_INODE_TABLE);
1592 if (!args->from)
1593 arg = EXT4_DEF_LI_WAIT_MULT;
1594 sbi->s_li_wait_mult = arg;
1595 } else if (token == Opt_max_dir_size_kb) {
1596 sbi->s_max_dir_size_kb = arg;
1597 } else if (token == Opt_stripe) {
1598 sbi->s_stripe = arg;
1599 } else if (m->flags & MOPT_DATAJ) {
1600 if (is_remount) {
1601 if (!sbi->s_journal)
1602 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1603 else if (test_opt(sb, DATA_FLAGS) !=
1604 m->mount_opt) {
1605 ext4_msg(sb, KERN_ERR,
1606 "Cannot change data mode on remount");
1607 return -1;
1608 }
1609 } else {
1610 clear_opt(sb, DATA_FLAGS);
1611 sbi->s_mount_opt |= m->mount_opt;
1612 }
1613 #ifdef CONFIG_QUOTA
1614 } else if (m->flags & MOPT_QFMT) {
1615 if (sb_any_quota_loaded(sb) &&
1616 sbi->s_jquota_fmt != m->mount_opt) {
1617 ext4_msg(sb, KERN_ERR, "Cannot "
1618 "change journaled quota options "
1619 "when quota turned on");
1620 return -1;
1621 }
1622 sbi->s_jquota_fmt = m->mount_opt;
1623 #endif
1624 } else {
1625 if (!args->from)
1626 arg = 1;
1627 if (m->flags & MOPT_CLEAR)
1628 arg = !arg;
1629 else if (unlikely(!(m->flags & MOPT_SET))) {
1630 ext4_msg(sb, KERN_WARNING,
1631 "buggy handling of option %s", opt);
1632 WARN_ON(1);
1633 return -1;
1634 }
1635 if (arg != 0)
1636 sbi->s_mount_opt |= m->mount_opt;
1637 else
1638 sbi->s_mount_opt &= ~m->mount_opt;
1639 }
1640 return 1;
1641 }
1642 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1643 "or missing value", opt);
1644 return -1;
1645 }
1646
1647 static int parse_options(char *options, struct super_block *sb,
1648 unsigned long *journal_devnum,
1649 unsigned int *journal_ioprio,
1650 int is_remount)
1651 {
1652 #ifdef CONFIG_QUOTA
1653 struct ext4_sb_info *sbi = EXT4_SB(sb);
1654 #endif
1655 char *p;
1656 substring_t args[MAX_OPT_ARGS];
1657 int token;
1658
1659 if (!options)
1660 return 1;
1661
1662 while ((p = strsep(&options, ",")) != NULL) {
1663 if (!*p)
1664 continue;
1665 /*
1666 * Initialize args struct so we know whether arg was
1667 * found; some options take optional arguments.
1668 */
1669 args[0].to = args[0].from = NULL;
1670 token = match_token(p, tokens, args);
1671 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1672 journal_ioprio, is_remount) < 0)
1673 return 0;
1674 }
1675 #ifdef CONFIG_QUOTA
1676 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1677 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1678 clear_opt(sb, USRQUOTA);
1679
1680 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1681 clear_opt(sb, GRPQUOTA);
1682
1683 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1684 ext4_msg(sb, KERN_ERR, "old and new quota "
1685 "format mixing");
1686 return 0;
1687 }
1688
1689 if (!sbi->s_jquota_fmt) {
1690 ext4_msg(sb, KERN_ERR, "journaled quota format "
1691 "not specified");
1692 return 0;
1693 }
1694 } else {
1695 if (sbi->s_jquota_fmt) {
1696 ext4_msg(sb, KERN_ERR, "journaled quota format "
1697 "specified with no journaling "
1698 "enabled");
1699 return 0;
1700 }
1701 }
1702 #endif
1703 return 1;
1704 }
1705
1706 static inline void ext4_show_quota_options(struct seq_file *seq,
1707 struct super_block *sb)
1708 {
1709 #if defined(CONFIG_QUOTA)
1710 struct ext4_sb_info *sbi = EXT4_SB(sb);
1711
1712 if (sbi->s_jquota_fmt) {
1713 char *fmtname = "";
1714
1715 switch (sbi->s_jquota_fmt) {
1716 case QFMT_VFS_OLD:
1717 fmtname = "vfsold";
1718 break;
1719 case QFMT_VFS_V0:
1720 fmtname = "vfsv0";
1721 break;
1722 case QFMT_VFS_V1:
1723 fmtname = "vfsv1";
1724 break;
1725 }
1726 seq_printf(seq, ",jqfmt=%s", fmtname);
1727 }
1728
1729 if (sbi->s_qf_names[USRQUOTA])
1730 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1731
1732 if (sbi->s_qf_names[GRPQUOTA])
1733 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1734
1735 if (test_opt(sb, USRQUOTA))
1736 seq_puts(seq, ",usrquota");
1737
1738 if (test_opt(sb, GRPQUOTA))
1739 seq_puts(seq, ",grpquota");
1740 #endif
1741 }
1742
1743 static const char *token2str(int token)
1744 {
1745 const struct match_token *t;
1746
1747 for (t = tokens; t->token != Opt_err; t++)
1748 if (t->token == token && !strchr(t->pattern, '='))
1749 break;
1750 return t->pattern;
1751 }
1752
1753 /*
1754 * Show an option if
1755 * - it's set to a non-default value OR
1756 * - if the per-sb default is different from the global default
1757 */
1758 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1759 int nodefs)
1760 {
1761 struct ext4_sb_info *sbi = EXT4_SB(sb);
1762 struct ext4_super_block *es = sbi->s_es;
1763 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1764 const struct mount_opts *m;
1765 char sep = nodefs ? '\n' : ',';
1766
1767 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1768 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1769
1770 if (sbi->s_sb_block != 1)
1771 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1772
1773 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1774 int want_set = m->flags & MOPT_SET;
1775 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1776 (m->flags & MOPT_CLEAR_ERR))
1777 continue;
1778 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1779 continue; /* skip if same as the default */
1780 if ((want_set &&
1781 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1782 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1783 continue; /* select Opt_noFoo vs Opt_Foo */
1784 SEQ_OPTS_PRINT("%s", token2str(m->token));
1785 }
1786
1787 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1788 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1789 SEQ_OPTS_PRINT("resuid=%u",
1790 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1791 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1792 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1793 SEQ_OPTS_PRINT("resgid=%u",
1794 from_kgid_munged(&init_user_ns, sbi->s_resgid));
1795 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1796 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1797 SEQ_OPTS_PUTS("errors=remount-ro");
1798 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1799 SEQ_OPTS_PUTS("errors=continue");
1800 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1801 SEQ_OPTS_PUTS("errors=panic");
1802 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1803 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1804 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1805 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1806 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1807 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1808 if (sb->s_flags & MS_I_VERSION)
1809 SEQ_OPTS_PUTS("i_version");
1810 if (nodefs || sbi->s_stripe)
1811 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1812 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1813 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1814 SEQ_OPTS_PUTS("data=journal");
1815 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1816 SEQ_OPTS_PUTS("data=ordered");
1817 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1818 SEQ_OPTS_PUTS("data=writeback");
1819 }
1820 if (nodefs ||
1821 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1822 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1823 sbi->s_inode_readahead_blks);
1824
1825 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1826 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1827 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1828 if (nodefs || sbi->s_max_dir_size_kb)
1829 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1830
1831 ext4_show_quota_options(seq, sb);
1832 return 0;
1833 }
1834
1835 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1836 {
1837 return _ext4_show_options(seq, root->d_sb, 0);
1838 }
1839
1840 static int options_seq_show(struct seq_file *seq, void *offset)
1841 {
1842 struct super_block *sb = seq->private;
1843 int rc;
1844
1845 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1846 rc = _ext4_show_options(seq, sb, 1);
1847 seq_puts(seq, "\n");
1848 return rc;
1849 }
1850
1851 static int options_open_fs(struct inode *inode, struct file *file)
1852 {
1853 return single_open(file, options_seq_show, PDE(inode)->data);
1854 }
1855
1856 static const struct file_operations ext4_seq_options_fops = {
1857 .owner = THIS_MODULE,
1858 .open = options_open_fs,
1859 .read = seq_read,
1860 .llseek = seq_lseek,
1861 .release = single_release,
1862 };
1863
1864 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1865 int read_only)
1866 {
1867 struct ext4_sb_info *sbi = EXT4_SB(sb);
1868 int res = 0;
1869
1870 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1871 ext4_msg(sb, KERN_ERR, "revision level too high, "
1872 "forcing read-only mode");
1873 res = MS_RDONLY;
1874 }
1875 if (read_only)
1876 goto done;
1877 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1878 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1879 "running e2fsck is recommended");
1880 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1881 ext4_msg(sb, KERN_WARNING,
1882 "warning: mounting fs with errors, "
1883 "running e2fsck is recommended");
1884 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1885 le16_to_cpu(es->s_mnt_count) >=
1886 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1887 ext4_msg(sb, KERN_WARNING,
1888 "warning: maximal mount count reached, "
1889 "running e2fsck is recommended");
1890 else if (le32_to_cpu(es->s_checkinterval) &&
1891 (le32_to_cpu(es->s_lastcheck) +
1892 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1893 ext4_msg(sb, KERN_WARNING,
1894 "warning: checktime reached, "
1895 "running e2fsck is recommended");
1896 if (!sbi->s_journal)
1897 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1898 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1899 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1900 le16_add_cpu(&es->s_mnt_count, 1);
1901 es->s_mtime = cpu_to_le32(get_seconds());
1902 ext4_update_dynamic_rev(sb);
1903 if (sbi->s_journal)
1904 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1905
1906 ext4_commit_super(sb, 1);
1907 done:
1908 if (test_opt(sb, DEBUG))
1909 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1910 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1911 sb->s_blocksize,
1912 sbi->s_groups_count,
1913 EXT4_BLOCKS_PER_GROUP(sb),
1914 EXT4_INODES_PER_GROUP(sb),
1915 sbi->s_mount_opt, sbi->s_mount_opt2);
1916
1917 cleancache_init_fs(sb);
1918 return res;
1919 }
1920
1921 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1922 {
1923 struct ext4_sb_info *sbi = EXT4_SB(sb);
1924 struct flex_groups *new_groups;
1925 int size;
1926
1927 if (!sbi->s_log_groups_per_flex)
1928 return 0;
1929
1930 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1931 if (size <= sbi->s_flex_groups_allocated)
1932 return 0;
1933
1934 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1935 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1936 if (!new_groups) {
1937 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1938 size / (int) sizeof(struct flex_groups));
1939 return -ENOMEM;
1940 }
1941
1942 if (sbi->s_flex_groups) {
1943 memcpy(new_groups, sbi->s_flex_groups,
1944 (sbi->s_flex_groups_allocated *
1945 sizeof(struct flex_groups)));
1946 ext4_kvfree(sbi->s_flex_groups);
1947 }
1948 sbi->s_flex_groups = new_groups;
1949 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1950 return 0;
1951 }
1952
1953 static int ext4_fill_flex_info(struct super_block *sb)
1954 {
1955 struct ext4_sb_info *sbi = EXT4_SB(sb);
1956 struct ext4_group_desc *gdp = NULL;
1957 ext4_group_t flex_group;
1958 unsigned int groups_per_flex = 0;
1959 int i, err;
1960
1961 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1962 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1963 sbi->s_log_groups_per_flex = 0;
1964 return 1;
1965 }
1966 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1967
1968 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1969 if (err)
1970 goto failed;
1971
1972 for (i = 0; i < sbi->s_groups_count; i++) {
1973 gdp = ext4_get_group_desc(sb, i, NULL);
1974
1975 flex_group = ext4_flex_group(sbi, i);
1976 atomic_add(ext4_free_inodes_count(sb, gdp),
1977 &sbi->s_flex_groups[flex_group].free_inodes);
1978 atomic_add(ext4_free_group_clusters(sb, gdp),
1979 &sbi->s_flex_groups[flex_group].free_clusters);
1980 atomic_add(ext4_used_dirs_count(sb, gdp),
1981 &sbi->s_flex_groups[flex_group].used_dirs);
1982 }
1983
1984 return 1;
1985 failed:
1986 return 0;
1987 }
1988
1989 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1990 struct ext4_group_desc *gdp)
1991 {
1992 int offset;
1993 __u16 crc = 0;
1994 __le32 le_group = cpu_to_le32(block_group);
1995
1996 if ((sbi->s_es->s_feature_ro_compat &
1997 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1998 /* Use new metadata_csum algorithm */
1999 __u16 old_csum;
2000 __u32 csum32;
2001
2002 old_csum = gdp->bg_checksum;
2003 gdp->bg_checksum = 0;
2004 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2005 sizeof(le_group));
2006 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2007 sbi->s_desc_size);
2008 gdp->bg_checksum = old_csum;
2009
2010 crc = csum32 & 0xFFFF;
2011 goto out;
2012 }
2013
2014 /* old crc16 code */
2015 offset = offsetof(struct ext4_group_desc, bg_checksum);
2016
2017 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2018 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2019 crc = crc16(crc, (__u8 *)gdp, offset);
2020 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2021 /* for checksum of struct ext4_group_desc do the rest...*/
2022 if ((sbi->s_es->s_feature_incompat &
2023 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2024 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2025 crc = crc16(crc, (__u8 *)gdp + offset,
2026 le16_to_cpu(sbi->s_es->s_desc_size) -
2027 offset);
2028
2029 out:
2030 return cpu_to_le16(crc);
2031 }
2032
2033 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2034 struct ext4_group_desc *gdp)
2035 {
2036 if (ext4_has_group_desc_csum(sb) &&
2037 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2038 block_group, gdp)))
2039 return 0;
2040
2041 return 1;
2042 }
2043
2044 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2045 struct ext4_group_desc *gdp)
2046 {
2047 if (!ext4_has_group_desc_csum(sb))
2048 return;
2049 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2050 }
2051
2052 /* Called at mount-time, super-block is locked */
2053 static int ext4_check_descriptors(struct super_block *sb,
2054 ext4_group_t *first_not_zeroed)
2055 {
2056 struct ext4_sb_info *sbi = EXT4_SB(sb);
2057 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2058 ext4_fsblk_t last_block;
2059 ext4_fsblk_t block_bitmap;
2060 ext4_fsblk_t inode_bitmap;
2061 ext4_fsblk_t inode_table;
2062 int flexbg_flag = 0;
2063 ext4_group_t i, grp = sbi->s_groups_count;
2064
2065 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2066 flexbg_flag = 1;
2067
2068 ext4_debug("Checking group descriptors");
2069
2070 for (i = 0; i < sbi->s_groups_count; i++) {
2071 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2072
2073 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2074 last_block = ext4_blocks_count(sbi->s_es) - 1;
2075 else
2076 last_block = first_block +
2077 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2078
2079 if ((grp == sbi->s_groups_count) &&
2080 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2081 grp = i;
2082
2083 block_bitmap = ext4_block_bitmap(sb, gdp);
2084 if (block_bitmap < first_block || block_bitmap > last_block) {
2085 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2086 "Block bitmap for group %u not in group "
2087 "(block %llu)!", i, block_bitmap);
2088 return 0;
2089 }
2090 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2091 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2092 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2093 "Inode bitmap for group %u not in group "
2094 "(block %llu)!", i, inode_bitmap);
2095 return 0;
2096 }
2097 inode_table = ext4_inode_table(sb, gdp);
2098 if (inode_table < first_block ||
2099 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2100 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2101 "Inode table for group %u not in group "
2102 "(block %llu)!", i, inode_table);
2103 return 0;
2104 }
2105 ext4_lock_group(sb, i);
2106 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2107 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2108 "Checksum for group %u failed (%u!=%u)",
2109 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2110 gdp)), le16_to_cpu(gdp->bg_checksum));
2111 if (!(sb->s_flags & MS_RDONLY)) {
2112 ext4_unlock_group(sb, i);
2113 return 0;
2114 }
2115 }
2116 ext4_unlock_group(sb, i);
2117 if (!flexbg_flag)
2118 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2119 }
2120 if (NULL != first_not_zeroed)
2121 *first_not_zeroed = grp;
2122
2123 ext4_free_blocks_count_set(sbi->s_es,
2124 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2125 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2126 return 1;
2127 }
2128
2129 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2130 * the superblock) which were deleted from all directories, but held open by
2131 * a process at the time of a crash. We walk the list and try to delete these
2132 * inodes at recovery time (only with a read-write filesystem).
2133 *
2134 * In order to keep the orphan inode chain consistent during traversal (in
2135 * case of crash during recovery), we link each inode into the superblock
2136 * orphan list_head and handle it the same way as an inode deletion during
2137 * normal operation (which journals the operations for us).
2138 *
2139 * We only do an iget() and an iput() on each inode, which is very safe if we
2140 * accidentally point at an in-use or already deleted inode. The worst that
2141 * can happen in this case is that we get a "bit already cleared" message from
2142 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2143 * e2fsck was run on this filesystem, and it must have already done the orphan
2144 * inode cleanup for us, so we can safely abort without any further action.
2145 */
2146 static void ext4_orphan_cleanup(struct super_block *sb,
2147 struct ext4_super_block *es)
2148 {
2149 unsigned int s_flags = sb->s_flags;
2150 int nr_orphans = 0, nr_truncates = 0;
2151 #ifdef CONFIG_QUOTA
2152 int i;
2153 #endif
2154 if (!es->s_last_orphan) {
2155 jbd_debug(4, "no orphan inodes to clean up\n");
2156 return;
2157 }
2158
2159 if (bdev_read_only(sb->s_bdev)) {
2160 ext4_msg(sb, KERN_ERR, "write access "
2161 "unavailable, skipping orphan cleanup");
2162 return;
2163 }
2164
2165 /* Check if feature set would not allow a r/w mount */
2166 if (!ext4_feature_set_ok(sb, 0)) {
2167 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2168 "unknown ROCOMPAT features");
2169 return;
2170 }
2171
2172 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2173 /* don't clear list on RO mount w/ errors */
2174 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2175 jbd_debug(1, "Errors on filesystem, "
2176 "clearing orphan list.\n");
2177 es->s_last_orphan = 0;
2178 }
2179 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2180 return;
2181 }
2182
2183 if (s_flags & MS_RDONLY) {
2184 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2185 sb->s_flags &= ~MS_RDONLY;
2186 }
2187 #ifdef CONFIG_QUOTA
2188 /* Needed for iput() to work correctly and not trash data */
2189 sb->s_flags |= MS_ACTIVE;
2190 /* Turn on quotas so that they are updated correctly */
2191 for (i = 0; i < MAXQUOTAS; i++) {
2192 if (EXT4_SB(sb)->s_qf_names[i]) {
2193 int ret = ext4_quota_on_mount(sb, i);
2194 if (ret < 0)
2195 ext4_msg(sb, KERN_ERR,
2196 "Cannot turn on journaled "
2197 "quota: error %d", ret);
2198 }
2199 }
2200 #endif
2201
2202 while (es->s_last_orphan) {
2203 struct inode *inode;
2204
2205 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2206 if (IS_ERR(inode)) {
2207 es->s_last_orphan = 0;
2208 break;
2209 }
2210
2211 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2212 dquot_initialize(inode);
2213 if (inode->i_nlink) {
2214 ext4_msg(sb, KERN_DEBUG,
2215 "%s: truncating inode %lu to %lld bytes",
2216 __func__, inode->i_ino, inode->i_size);
2217 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2218 inode->i_ino, inode->i_size);
2219 ext4_truncate(inode);
2220 nr_truncates++;
2221 } else {
2222 ext4_msg(sb, KERN_DEBUG,
2223 "%s: deleting unreferenced inode %lu",
2224 __func__, inode->i_ino);
2225 jbd_debug(2, "deleting unreferenced inode %lu\n",
2226 inode->i_ino);
2227 nr_orphans++;
2228 }
2229 iput(inode); /* The delete magic happens here! */
2230 }
2231
2232 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2233
2234 if (nr_orphans)
2235 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2236 PLURAL(nr_orphans));
2237 if (nr_truncates)
2238 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2239 PLURAL(nr_truncates));
2240 #ifdef CONFIG_QUOTA
2241 /* Turn quotas off */
2242 for (i = 0; i < MAXQUOTAS; i++) {
2243 if (sb_dqopt(sb)->files[i])
2244 dquot_quota_off(sb, i);
2245 }
2246 #endif
2247 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2248 }
2249
2250 /*
2251 * Maximal extent format file size.
2252 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2253 * extent format containers, within a sector_t, and within i_blocks
2254 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2255 * so that won't be a limiting factor.
2256 *
2257 * However there is other limiting factor. We do store extents in the form
2258 * of starting block and length, hence the resulting length of the extent
2259 * covering maximum file size must fit into on-disk format containers as
2260 * well. Given that length is always by 1 unit bigger than max unit (because
2261 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2262 *
2263 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2264 */
2265 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2266 {
2267 loff_t res;
2268 loff_t upper_limit = MAX_LFS_FILESIZE;
2269
2270 /* small i_blocks in vfs inode? */
2271 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2272 /*
2273 * CONFIG_LBDAF is not enabled implies the inode
2274 * i_block represent total blocks in 512 bytes
2275 * 32 == size of vfs inode i_blocks * 8
2276 */
2277 upper_limit = (1LL << 32) - 1;
2278
2279 /* total blocks in file system block size */
2280 upper_limit >>= (blkbits - 9);
2281 upper_limit <<= blkbits;
2282 }
2283
2284 /*
2285 * 32-bit extent-start container, ee_block. We lower the maxbytes
2286 * by one fs block, so ee_len can cover the extent of maximum file
2287 * size
2288 */
2289 res = (1LL << 32) - 1;
2290 res <<= blkbits;
2291
2292 /* Sanity check against vm- & vfs- imposed limits */
2293 if (res > upper_limit)
2294 res = upper_limit;
2295
2296 return res;
2297 }
2298
2299 /*
2300 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2301 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2302 * We need to be 1 filesystem block less than the 2^48 sector limit.
2303 */
2304 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2305 {
2306 loff_t res = EXT4_NDIR_BLOCKS;
2307 int meta_blocks;
2308 loff_t upper_limit;
2309 /* This is calculated to be the largest file size for a dense, block
2310 * mapped file such that the file's total number of 512-byte sectors,
2311 * including data and all indirect blocks, does not exceed (2^48 - 1).
2312 *
2313 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2314 * number of 512-byte sectors of the file.
2315 */
2316
2317 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2318 /*
2319 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2320 * the inode i_block field represents total file blocks in
2321 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2322 */
2323 upper_limit = (1LL << 32) - 1;
2324
2325 /* total blocks in file system block size */
2326 upper_limit >>= (bits - 9);
2327
2328 } else {
2329 /*
2330 * We use 48 bit ext4_inode i_blocks
2331 * With EXT4_HUGE_FILE_FL set the i_blocks
2332 * represent total number of blocks in
2333 * file system block size
2334 */
2335 upper_limit = (1LL << 48) - 1;
2336
2337 }
2338
2339 /* indirect blocks */
2340 meta_blocks = 1;
2341 /* double indirect blocks */
2342 meta_blocks += 1 + (1LL << (bits-2));
2343 /* tripple indirect blocks */
2344 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2345
2346 upper_limit -= meta_blocks;
2347 upper_limit <<= bits;
2348
2349 res += 1LL << (bits-2);
2350 res += 1LL << (2*(bits-2));
2351 res += 1LL << (3*(bits-2));
2352 res <<= bits;
2353 if (res > upper_limit)
2354 res = upper_limit;
2355
2356 if (res > MAX_LFS_FILESIZE)
2357 res = MAX_LFS_FILESIZE;
2358
2359 return res;
2360 }
2361
2362 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2363 ext4_fsblk_t logical_sb_block, int nr)
2364 {
2365 struct ext4_sb_info *sbi = EXT4_SB(sb);
2366 ext4_group_t bg, first_meta_bg;
2367 int has_super = 0;
2368
2369 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2370
2371 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2372 nr < first_meta_bg)
2373 return logical_sb_block + nr + 1;
2374 bg = sbi->s_desc_per_block * nr;
2375 if (ext4_bg_has_super(sb, bg))
2376 has_super = 1;
2377
2378 return (has_super + ext4_group_first_block_no(sb, bg));
2379 }
2380
2381 /**
2382 * ext4_get_stripe_size: Get the stripe size.
2383 * @sbi: In memory super block info
2384 *
2385 * If we have specified it via mount option, then
2386 * use the mount option value. If the value specified at mount time is
2387 * greater than the blocks per group use the super block value.
2388 * If the super block value is greater than blocks per group return 0.
2389 * Allocator needs it be less than blocks per group.
2390 *
2391 */
2392 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2393 {
2394 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2395 unsigned long stripe_width =
2396 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2397 int ret;
2398
2399 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2400 ret = sbi->s_stripe;
2401 else if (stripe_width <= sbi->s_blocks_per_group)
2402 ret = stripe_width;
2403 else if (stride <= sbi->s_blocks_per_group)
2404 ret = stride;
2405 else
2406 ret = 0;
2407
2408 /*
2409 * If the stripe width is 1, this makes no sense and
2410 * we set it to 0 to turn off stripe handling code.
2411 */
2412 if (ret <= 1)
2413 ret = 0;
2414
2415 return ret;
2416 }
2417
2418 /* sysfs supprt */
2419
2420 struct ext4_attr {
2421 struct attribute attr;
2422 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2423 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2424 const char *, size_t);
2425 int offset;
2426 };
2427
2428 static int parse_strtoul(const char *buf,
2429 unsigned long max, unsigned long *value)
2430 {
2431 char *endp;
2432
2433 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2434 endp = skip_spaces(endp);
2435 if (*endp || *value > max)
2436 return -EINVAL;
2437
2438 return 0;
2439 }
2440
2441 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2442 struct ext4_sb_info *sbi,
2443 char *buf)
2444 {
2445 return snprintf(buf, PAGE_SIZE, "%llu\n",
2446 (s64) EXT4_C2B(sbi,
2447 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2448 }
2449
2450 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2451 struct ext4_sb_info *sbi, char *buf)
2452 {
2453 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2454
2455 if (!sb->s_bdev->bd_part)
2456 return snprintf(buf, PAGE_SIZE, "0\n");
2457 return snprintf(buf, PAGE_SIZE, "%lu\n",
2458 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2459 sbi->s_sectors_written_start) >> 1);
2460 }
2461
2462 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2463 struct ext4_sb_info *sbi, char *buf)
2464 {
2465 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2466
2467 if (!sb->s_bdev->bd_part)
2468 return snprintf(buf, PAGE_SIZE, "0\n");
2469 return snprintf(buf, PAGE_SIZE, "%llu\n",
2470 (unsigned long long)(sbi->s_kbytes_written +
2471 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2472 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2473 }
2474
2475 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2476 struct ext4_sb_info *sbi,
2477 const char *buf, size_t count)
2478 {
2479 unsigned long t;
2480
2481 if (parse_strtoul(buf, 0x40000000, &t))
2482 return -EINVAL;
2483
2484 if (t && !is_power_of_2(t))
2485 return -EINVAL;
2486
2487 sbi->s_inode_readahead_blks = t;
2488 return count;
2489 }
2490
2491 static ssize_t sbi_ui_show(struct ext4_attr *a,
2492 struct ext4_sb_info *sbi, char *buf)
2493 {
2494 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2495
2496 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2497 }
2498
2499 static ssize_t sbi_ui_store(struct ext4_attr *a,
2500 struct ext4_sb_info *sbi,
2501 const char *buf, size_t count)
2502 {
2503 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2504 unsigned long t;
2505
2506 if (parse_strtoul(buf, 0xffffffff, &t))
2507 return -EINVAL;
2508 *ui = t;
2509 return count;
2510 }
2511
2512 static ssize_t trigger_test_error(struct ext4_attr *a,
2513 struct ext4_sb_info *sbi,
2514 const char *buf, size_t count)
2515 {
2516 int len = count;
2517
2518 if (!capable(CAP_SYS_ADMIN))
2519 return -EPERM;
2520
2521 if (len && buf[len-1] == '\n')
2522 len--;
2523
2524 if (len)
2525 ext4_error(sbi->s_sb, "%.*s", len, buf);
2526 return count;
2527 }
2528
2529 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2530 static struct ext4_attr ext4_attr_##_name = { \
2531 .attr = {.name = __stringify(_name), .mode = _mode }, \
2532 .show = _show, \
2533 .store = _store, \
2534 .offset = offsetof(struct ext4_sb_info, _elname), \
2535 }
2536 #define EXT4_ATTR(name, mode, show, store) \
2537 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2538
2539 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2540 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2541 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2542 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2543 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2544 #define ATTR_LIST(name) &ext4_attr_##name.attr
2545
2546 EXT4_RO_ATTR(delayed_allocation_blocks);
2547 EXT4_RO_ATTR(session_write_kbytes);
2548 EXT4_RO_ATTR(lifetime_write_kbytes);
2549 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2550 inode_readahead_blks_store, s_inode_readahead_blks);
2551 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2552 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2553 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2554 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2555 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2556 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2557 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2558 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2559 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2560 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2561
2562 static struct attribute *ext4_attrs[] = {
2563 ATTR_LIST(delayed_allocation_blocks),
2564 ATTR_LIST(session_write_kbytes),
2565 ATTR_LIST(lifetime_write_kbytes),
2566 ATTR_LIST(inode_readahead_blks),
2567 ATTR_LIST(inode_goal),
2568 ATTR_LIST(mb_stats),
2569 ATTR_LIST(mb_max_to_scan),
2570 ATTR_LIST(mb_min_to_scan),
2571 ATTR_LIST(mb_order2_req),
2572 ATTR_LIST(mb_stream_req),
2573 ATTR_LIST(mb_group_prealloc),
2574 ATTR_LIST(max_writeback_mb_bump),
2575 ATTR_LIST(extent_max_zeroout_kb),
2576 ATTR_LIST(trigger_fs_error),
2577 NULL,
2578 };
2579
2580 /* Features this copy of ext4 supports */
2581 EXT4_INFO_ATTR(lazy_itable_init);
2582 EXT4_INFO_ATTR(batched_discard);
2583 EXT4_INFO_ATTR(meta_bg_resize);
2584
2585 static struct attribute *ext4_feat_attrs[] = {
2586 ATTR_LIST(lazy_itable_init),
2587 ATTR_LIST(batched_discard),
2588 ATTR_LIST(meta_bg_resize),
2589 NULL,
2590 };
2591
2592 static ssize_t ext4_attr_show(struct kobject *kobj,
2593 struct attribute *attr, char *buf)
2594 {
2595 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2596 s_kobj);
2597 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2598
2599 return a->show ? a->show(a, sbi, buf) : 0;
2600 }
2601
2602 static ssize_t ext4_attr_store(struct kobject *kobj,
2603 struct attribute *attr,
2604 const char *buf, size_t len)
2605 {
2606 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2607 s_kobj);
2608 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2609
2610 return a->store ? a->store(a, sbi, buf, len) : 0;
2611 }
2612
2613 static void ext4_sb_release(struct kobject *kobj)
2614 {
2615 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2616 s_kobj);
2617 complete(&sbi->s_kobj_unregister);
2618 }
2619
2620 static const struct sysfs_ops ext4_attr_ops = {
2621 .show = ext4_attr_show,
2622 .store = ext4_attr_store,
2623 };
2624
2625 static struct kobj_type ext4_ktype = {
2626 .default_attrs = ext4_attrs,
2627 .sysfs_ops = &ext4_attr_ops,
2628 .release = ext4_sb_release,
2629 };
2630
2631 static void ext4_feat_release(struct kobject *kobj)
2632 {
2633 complete(&ext4_feat->f_kobj_unregister);
2634 }
2635
2636 static struct kobj_type ext4_feat_ktype = {
2637 .default_attrs = ext4_feat_attrs,
2638 .sysfs_ops = &ext4_attr_ops,
2639 .release = ext4_feat_release,
2640 };
2641
2642 /*
2643 * Check whether this filesystem can be mounted based on
2644 * the features present and the RDONLY/RDWR mount requested.
2645 * Returns 1 if this filesystem can be mounted as requested,
2646 * 0 if it cannot be.
2647 */
2648 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2649 {
2650 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2651 ext4_msg(sb, KERN_ERR,
2652 "Couldn't mount because of "
2653 "unsupported optional features (%x)",
2654 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2655 ~EXT4_FEATURE_INCOMPAT_SUPP));
2656 return 0;
2657 }
2658
2659 if (readonly)
2660 return 1;
2661
2662 /* Check that feature set is OK for a read-write mount */
2663 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2664 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2665 "unsupported optional features (%x)",
2666 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2667 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2668 return 0;
2669 }
2670 /*
2671 * Large file size enabled file system can only be mounted
2672 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2673 */
2674 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2675 if (sizeof(blkcnt_t) < sizeof(u64)) {
2676 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2677 "cannot be mounted RDWR without "
2678 "CONFIG_LBDAF");
2679 return 0;
2680 }
2681 }
2682 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2683 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2684 ext4_msg(sb, KERN_ERR,
2685 "Can't support bigalloc feature without "
2686 "extents feature\n");
2687 return 0;
2688 }
2689
2690 #ifndef CONFIG_QUOTA
2691 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2692 !readonly) {
2693 ext4_msg(sb, KERN_ERR,
2694 "Filesystem with quota feature cannot be mounted RDWR "
2695 "without CONFIG_QUOTA");
2696 return 0;
2697 }
2698 #endif /* CONFIG_QUOTA */
2699 return 1;
2700 }
2701
2702 /*
2703 * This function is called once a day if we have errors logged
2704 * on the file system
2705 */
2706 static void print_daily_error_info(unsigned long arg)
2707 {
2708 struct super_block *sb = (struct super_block *) arg;
2709 struct ext4_sb_info *sbi;
2710 struct ext4_super_block *es;
2711
2712 sbi = EXT4_SB(sb);
2713 es = sbi->s_es;
2714
2715 if (es->s_error_count)
2716 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2717 le32_to_cpu(es->s_error_count));
2718 if (es->s_first_error_time) {
2719 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2720 sb->s_id, le32_to_cpu(es->s_first_error_time),
2721 (int) sizeof(es->s_first_error_func),
2722 es->s_first_error_func,
2723 le32_to_cpu(es->s_first_error_line));
2724 if (es->s_first_error_ino)
2725 printk(": inode %u",
2726 le32_to_cpu(es->s_first_error_ino));
2727 if (es->s_first_error_block)
2728 printk(": block %llu", (unsigned long long)
2729 le64_to_cpu(es->s_first_error_block));
2730 printk("\n");
2731 }
2732 if (es->s_last_error_time) {
2733 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2734 sb->s_id, le32_to_cpu(es->s_last_error_time),
2735 (int) sizeof(es->s_last_error_func),
2736 es->s_last_error_func,
2737 le32_to_cpu(es->s_last_error_line));
2738 if (es->s_last_error_ino)
2739 printk(": inode %u",
2740 le32_to_cpu(es->s_last_error_ino));
2741 if (es->s_last_error_block)
2742 printk(": block %llu", (unsigned long long)
2743 le64_to_cpu(es->s_last_error_block));
2744 printk("\n");
2745 }
2746 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2747 }
2748
2749 /* Find next suitable group and run ext4_init_inode_table */
2750 static int ext4_run_li_request(struct ext4_li_request *elr)
2751 {
2752 struct ext4_group_desc *gdp = NULL;
2753 ext4_group_t group, ngroups;
2754 struct super_block *sb;
2755 unsigned long timeout = 0;
2756 int ret = 0;
2757
2758 sb = elr->lr_super;
2759 ngroups = EXT4_SB(sb)->s_groups_count;
2760
2761 sb_start_write(sb);
2762 for (group = elr->lr_next_group; group < ngroups; group++) {
2763 gdp = ext4_get_group_desc(sb, group, NULL);
2764 if (!gdp) {
2765 ret = 1;
2766 break;
2767 }
2768
2769 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2770 break;
2771 }
2772
2773 if (group == ngroups)
2774 ret = 1;
2775
2776 if (!ret) {
2777 timeout = jiffies;
2778 ret = ext4_init_inode_table(sb, group,
2779 elr->lr_timeout ? 0 : 1);
2780 if (elr->lr_timeout == 0) {
2781 timeout = (jiffies - timeout) *
2782 elr->lr_sbi->s_li_wait_mult;
2783 elr->lr_timeout = timeout;
2784 }
2785 elr->lr_next_sched = jiffies + elr->lr_timeout;
2786 elr->lr_next_group = group + 1;
2787 }
2788 sb_end_write(sb);
2789
2790 return ret;
2791 }
2792
2793 /*
2794 * Remove lr_request from the list_request and free the
2795 * request structure. Should be called with li_list_mtx held
2796 */
2797 static void ext4_remove_li_request(struct ext4_li_request *elr)
2798 {
2799 struct ext4_sb_info *sbi;
2800
2801 if (!elr)
2802 return;
2803
2804 sbi = elr->lr_sbi;
2805
2806 list_del(&elr->lr_request);
2807 sbi->s_li_request = NULL;
2808 kfree(elr);
2809 }
2810
2811 static void ext4_unregister_li_request(struct super_block *sb)
2812 {
2813 mutex_lock(&ext4_li_mtx);
2814 if (!ext4_li_info) {
2815 mutex_unlock(&ext4_li_mtx);
2816 return;
2817 }
2818
2819 mutex_lock(&ext4_li_info->li_list_mtx);
2820 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2821 mutex_unlock(&ext4_li_info->li_list_mtx);
2822 mutex_unlock(&ext4_li_mtx);
2823 }
2824
2825 static struct task_struct *ext4_lazyinit_task;
2826
2827 /*
2828 * This is the function where ext4lazyinit thread lives. It walks
2829 * through the request list searching for next scheduled filesystem.
2830 * When such a fs is found, run the lazy initialization request
2831 * (ext4_rn_li_request) and keep track of the time spend in this
2832 * function. Based on that time we compute next schedule time of
2833 * the request. When walking through the list is complete, compute
2834 * next waking time and put itself into sleep.
2835 */
2836 static int ext4_lazyinit_thread(void *arg)
2837 {
2838 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2839 struct list_head *pos, *n;
2840 struct ext4_li_request *elr;
2841 unsigned long next_wakeup, cur;
2842
2843 BUG_ON(NULL == eli);
2844
2845 cont_thread:
2846 while (true) {
2847 next_wakeup = MAX_JIFFY_OFFSET;
2848
2849 mutex_lock(&eli->li_list_mtx);
2850 if (list_empty(&eli->li_request_list)) {
2851 mutex_unlock(&eli->li_list_mtx);
2852 goto exit_thread;
2853 }
2854
2855 list_for_each_safe(pos, n, &eli->li_request_list) {
2856 elr = list_entry(pos, struct ext4_li_request,
2857 lr_request);
2858
2859 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2860 if (ext4_run_li_request(elr) != 0) {
2861 /* error, remove the lazy_init job */
2862 ext4_remove_li_request(elr);
2863 continue;
2864 }
2865 }
2866
2867 if (time_before(elr->lr_next_sched, next_wakeup))
2868 next_wakeup = elr->lr_next_sched;
2869 }
2870 mutex_unlock(&eli->li_list_mtx);
2871
2872 try_to_freeze();
2873
2874 cur = jiffies;
2875 if ((time_after_eq(cur, next_wakeup)) ||
2876 (MAX_JIFFY_OFFSET == next_wakeup)) {
2877 cond_resched();
2878 continue;
2879 }
2880
2881 schedule_timeout_interruptible(next_wakeup - cur);
2882
2883 if (kthread_should_stop()) {
2884 ext4_clear_request_list();
2885 goto exit_thread;
2886 }
2887 }
2888
2889 exit_thread:
2890 /*
2891 * It looks like the request list is empty, but we need
2892 * to check it under the li_list_mtx lock, to prevent any
2893 * additions into it, and of course we should lock ext4_li_mtx
2894 * to atomically free the list and ext4_li_info, because at
2895 * this point another ext4 filesystem could be registering
2896 * new one.
2897 */
2898 mutex_lock(&ext4_li_mtx);
2899 mutex_lock(&eli->li_list_mtx);
2900 if (!list_empty(&eli->li_request_list)) {
2901 mutex_unlock(&eli->li_list_mtx);
2902 mutex_unlock(&ext4_li_mtx);
2903 goto cont_thread;
2904 }
2905 mutex_unlock(&eli->li_list_mtx);
2906 kfree(ext4_li_info);
2907 ext4_li_info = NULL;
2908 mutex_unlock(&ext4_li_mtx);
2909
2910 return 0;
2911 }
2912
2913 static void ext4_clear_request_list(void)
2914 {
2915 struct list_head *pos, *n;
2916 struct ext4_li_request *elr;
2917
2918 mutex_lock(&ext4_li_info->li_list_mtx);
2919 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2920 elr = list_entry(pos, struct ext4_li_request,
2921 lr_request);
2922 ext4_remove_li_request(elr);
2923 }
2924 mutex_unlock(&ext4_li_info->li_list_mtx);
2925 }
2926
2927 static int ext4_run_lazyinit_thread(void)
2928 {
2929 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2930 ext4_li_info, "ext4lazyinit");
2931 if (IS_ERR(ext4_lazyinit_task)) {
2932 int err = PTR_ERR(ext4_lazyinit_task);
2933 ext4_clear_request_list();
2934 kfree(ext4_li_info);
2935 ext4_li_info = NULL;
2936 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2937 "initialization thread\n",
2938 err);
2939 return err;
2940 }
2941 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2942 return 0;
2943 }
2944
2945 /*
2946 * Check whether it make sense to run itable init. thread or not.
2947 * If there is at least one uninitialized inode table, return
2948 * corresponding group number, else the loop goes through all
2949 * groups and return total number of groups.
2950 */
2951 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2952 {
2953 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2954 struct ext4_group_desc *gdp = NULL;
2955
2956 for (group = 0; group < ngroups; group++) {
2957 gdp = ext4_get_group_desc(sb, group, NULL);
2958 if (!gdp)
2959 continue;
2960
2961 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2962 break;
2963 }
2964
2965 return group;
2966 }
2967
2968 static int ext4_li_info_new(void)
2969 {
2970 struct ext4_lazy_init *eli = NULL;
2971
2972 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2973 if (!eli)
2974 return -ENOMEM;
2975
2976 INIT_LIST_HEAD(&eli->li_request_list);
2977 mutex_init(&eli->li_list_mtx);
2978
2979 eli->li_state |= EXT4_LAZYINIT_QUIT;
2980
2981 ext4_li_info = eli;
2982
2983 return 0;
2984 }
2985
2986 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2987 ext4_group_t start)
2988 {
2989 struct ext4_sb_info *sbi = EXT4_SB(sb);
2990 struct ext4_li_request *elr;
2991 unsigned long rnd;
2992
2993 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2994 if (!elr)
2995 return NULL;
2996
2997 elr->lr_super = sb;
2998 elr->lr_sbi = sbi;
2999 elr->lr_next_group = start;
3000
3001 /*
3002 * Randomize first schedule time of the request to
3003 * spread the inode table initialization requests
3004 * better.
3005 */
3006 get_random_bytes(&rnd, sizeof(rnd));
3007 elr->lr_next_sched = jiffies + (unsigned long)rnd %
3008 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3009
3010 return elr;
3011 }
3012
3013 static int ext4_register_li_request(struct super_block *sb,
3014 ext4_group_t first_not_zeroed)
3015 {
3016 struct ext4_sb_info *sbi = EXT4_SB(sb);
3017 struct ext4_li_request *elr;
3018 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3019 int ret = 0;
3020
3021 if (sbi->s_li_request != NULL) {
3022 /*
3023 * Reset timeout so it can be computed again, because
3024 * s_li_wait_mult might have changed.
3025 */
3026 sbi->s_li_request->lr_timeout = 0;
3027 return 0;
3028 }
3029
3030 if (first_not_zeroed == ngroups ||
3031 (sb->s_flags & MS_RDONLY) ||
3032 !test_opt(sb, INIT_INODE_TABLE))
3033 return 0;
3034
3035 elr = ext4_li_request_new(sb, first_not_zeroed);
3036 if (!elr)
3037 return -ENOMEM;
3038
3039 mutex_lock(&ext4_li_mtx);
3040
3041 if (NULL == ext4_li_info) {
3042 ret = ext4_li_info_new();
3043 if (ret)
3044 goto out;
3045 }
3046
3047 mutex_lock(&ext4_li_info->li_list_mtx);
3048 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3049 mutex_unlock(&ext4_li_info->li_list_mtx);
3050
3051 sbi->s_li_request = elr;
3052 /*
3053 * set elr to NULL here since it has been inserted to
3054 * the request_list and the removal and free of it is
3055 * handled by ext4_clear_request_list from now on.
3056 */
3057 elr = NULL;
3058
3059 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3060 ret = ext4_run_lazyinit_thread();
3061 if (ret)
3062 goto out;
3063 }
3064 out:
3065 mutex_unlock(&ext4_li_mtx);
3066 if (ret)
3067 kfree(elr);
3068 return ret;
3069 }
3070
3071 /*
3072 * We do not need to lock anything since this is called on
3073 * module unload.
3074 */
3075 static void ext4_destroy_lazyinit_thread(void)
3076 {
3077 /*
3078 * If thread exited earlier
3079 * there's nothing to be done.
3080 */
3081 if (!ext4_li_info || !ext4_lazyinit_task)
3082 return;
3083
3084 kthread_stop(ext4_lazyinit_task);
3085 }
3086
3087 static int set_journal_csum_feature_set(struct super_block *sb)
3088 {
3089 int ret = 1;
3090 int compat, incompat;
3091 struct ext4_sb_info *sbi = EXT4_SB(sb);
3092
3093 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3094 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3095 /* journal checksum v2 */
3096 compat = 0;
3097 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3098 } else {
3099 /* journal checksum v1 */
3100 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3101 incompat = 0;
3102 }
3103
3104 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3105 ret = jbd2_journal_set_features(sbi->s_journal,
3106 compat, 0,
3107 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3108 incompat);
3109 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3110 ret = jbd2_journal_set_features(sbi->s_journal,
3111 compat, 0,
3112 incompat);
3113 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3114 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3115 } else {
3116 jbd2_journal_clear_features(sbi->s_journal,
3117 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3118 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3119 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3120 }
3121
3122 return ret;
3123 }
3124
3125 /*
3126 * Note: calculating the overhead so we can be compatible with
3127 * historical BSD practice is quite difficult in the face of
3128 * clusters/bigalloc. This is because multiple metadata blocks from
3129 * different block group can end up in the same allocation cluster.
3130 * Calculating the exact overhead in the face of clustered allocation
3131 * requires either O(all block bitmaps) in memory or O(number of block
3132 * groups**2) in time. We will still calculate the superblock for
3133 * older file systems --- and if we come across with a bigalloc file
3134 * system with zero in s_overhead_clusters the estimate will be close to
3135 * correct especially for very large cluster sizes --- but for newer
3136 * file systems, it's better to calculate this figure once at mkfs
3137 * time, and store it in the superblock. If the superblock value is
3138 * present (even for non-bigalloc file systems), we will use it.
3139 */
3140 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3141 char *buf)
3142 {
3143 struct ext4_sb_info *sbi = EXT4_SB(sb);
3144 struct ext4_group_desc *gdp;
3145 ext4_fsblk_t first_block, last_block, b;
3146 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3147 int s, j, count = 0;
3148
3149 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3150 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3151 sbi->s_itb_per_group + 2);
3152
3153 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3154 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3155 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3156 for (i = 0; i < ngroups; i++) {
3157 gdp = ext4_get_group_desc(sb, i, NULL);
3158 b = ext4_block_bitmap(sb, gdp);
3159 if (b >= first_block && b <= last_block) {
3160 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3161 count++;
3162 }
3163 b = ext4_inode_bitmap(sb, gdp);
3164 if (b >= first_block && b <= last_block) {
3165 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3166 count++;
3167 }
3168 b = ext4_inode_table(sb, gdp);
3169 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3170 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3171 int c = EXT4_B2C(sbi, b - first_block);
3172 ext4_set_bit(c, buf);
3173 count++;
3174 }
3175 if (i != grp)
3176 continue;
3177 s = 0;
3178 if (ext4_bg_has_super(sb, grp)) {
3179 ext4_set_bit(s++, buf);
3180 count++;
3181 }
3182 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3183 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3184 count++;
3185 }
3186 }
3187 if (!count)
3188 return 0;
3189 return EXT4_CLUSTERS_PER_GROUP(sb) -
3190 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3191 }
3192
3193 /*
3194 * Compute the overhead and stash it in sbi->s_overhead
3195 */
3196 int ext4_calculate_overhead(struct super_block *sb)
3197 {
3198 struct ext4_sb_info *sbi = EXT4_SB(sb);
3199 struct ext4_super_block *es = sbi->s_es;
3200 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3201 ext4_fsblk_t overhead = 0;
3202 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3203
3204 memset(buf, 0, PAGE_SIZE);
3205 if (!buf)
3206 return -ENOMEM;
3207
3208 /*
3209 * Compute the overhead (FS structures). This is constant
3210 * for a given filesystem unless the number of block groups
3211 * changes so we cache the previous value until it does.
3212 */
3213
3214 /*
3215 * All of the blocks before first_data_block are overhead
3216 */
3217 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3218
3219 /*
3220 * Add the overhead found in each block group
3221 */
3222 for (i = 0; i < ngroups; i++) {
3223 int blks;
3224
3225 blks = count_overhead(sb, i, buf);
3226 overhead += blks;
3227 if (blks)
3228 memset(buf, 0, PAGE_SIZE);
3229 cond_resched();
3230 }
3231 sbi->s_overhead = overhead;
3232 smp_wmb();
3233 free_page((unsigned long) buf);
3234 return 0;
3235 }
3236
3237 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3238 {
3239 char *orig_data = kstrdup(data, GFP_KERNEL);
3240 struct buffer_head *bh;
3241 struct ext4_super_block *es = NULL;
3242 struct ext4_sb_info *sbi;
3243 ext4_fsblk_t block;
3244 ext4_fsblk_t sb_block = get_sb_block(&data);
3245 ext4_fsblk_t logical_sb_block;
3246 unsigned long offset = 0;
3247 unsigned long journal_devnum = 0;
3248 unsigned long def_mount_opts;
3249 struct inode *root;
3250 char *cp;
3251 const char *descr;
3252 int ret = -ENOMEM;
3253 int blocksize, clustersize;
3254 unsigned int db_count;
3255 unsigned int i;
3256 int needs_recovery, has_huge_files, has_bigalloc;
3257 __u64 blocks_count;
3258 int err;
3259 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3260 ext4_group_t first_not_zeroed;
3261
3262 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3263 if (!sbi)
3264 goto out_free_orig;
3265
3266 sbi->s_blockgroup_lock =
3267 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3268 if (!sbi->s_blockgroup_lock) {
3269 kfree(sbi);
3270 goto out_free_orig;
3271 }
3272 sb->s_fs_info = sbi;
3273 sbi->s_sb = sb;
3274 sbi->s_mount_opt = 0;
3275 sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3276 sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
3277 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3278 sbi->s_sb_block = sb_block;
3279 if (sb->s_bdev->bd_part)
3280 sbi->s_sectors_written_start =
3281 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3282
3283 /* Cleanup superblock name */
3284 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3285 *cp = '!';
3286
3287 ret = -EINVAL;
3288 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3289 if (!blocksize) {
3290 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3291 goto out_fail;
3292 }
3293
3294 /*
3295 * The ext4 superblock will not be buffer aligned for other than 1kB
3296 * block sizes. We need to calculate the offset from buffer start.
3297 */
3298 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3299 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3300 offset = do_div(logical_sb_block, blocksize);
3301 } else {
3302 logical_sb_block = sb_block;
3303 }
3304
3305 if (!(bh = sb_bread(sb, logical_sb_block))) {
3306 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3307 goto out_fail;
3308 }
3309 /*
3310 * Note: s_es must be initialized as soon as possible because
3311 * some ext4 macro-instructions depend on its value
3312 */
3313 es = (struct ext4_super_block *) (bh->b_data + offset);
3314 sbi->s_es = es;
3315 sb->s_magic = le16_to_cpu(es->s_magic);
3316 if (sb->s_magic != EXT4_SUPER_MAGIC)
3317 goto cantfind_ext4;
3318 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3319
3320 /* Warn if metadata_csum and gdt_csum are both set. */
3321 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3322 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3323 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3324 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3325 "redundant flags; please run fsck.");
3326
3327 /* Check for a known checksum algorithm */
3328 if (!ext4_verify_csum_type(sb, es)) {
3329 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3330 "unknown checksum algorithm.");
3331 silent = 1;
3332 goto cantfind_ext4;
3333 }
3334
3335 /* Load the checksum driver */
3336 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3337 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3338 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3339 if (IS_ERR(sbi->s_chksum_driver)) {
3340 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3341 ret = PTR_ERR(sbi->s_chksum_driver);
3342 sbi->s_chksum_driver = NULL;
3343 goto failed_mount;
3344 }
3345 }
3346
3347 /* Check superblock checksum */
3348 if (!ext4_superblock_csum_verify(sb, es)) {
3349 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3350 "invalid superblock checksum. Run e2fsck?");
3351 silent = 1;
3352 goto cantfind_ext4;
3353 }
3354
3355 /* Precompute checksum seed for all metadata */
3356 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3357 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3358 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3359 sizeof(es->s_uuid));
3360
3361 /* Set defaults before we parse the mount options */
3362 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3363 set_opt(sb, INIT_INODE_TABLE);
3364 if (def_mount_opts & EXT4_DEFM_DEBUG)
3365 set_opt(sb, DEBUG);
3366 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3367 set_opt(sb, GRPID);
3368 if (def_mount_opts & EXT4_DEFM_UID16)
3369 set_opt(sb, NO_UID32);
3370 /* xattr user namespace & acls are now defaulted on */
3371 #ifdef CONFIG_EXT4_FS_XATTR
3372 set_opt(sb, XATTR_USER);
3373 #endif
3374 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3375 set_opt(sb, POSIX_ACL);
3376 #endif
3377 set_opt(sb, MBLK_IO_SUBMIT);
3378 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3379 set_opt(sb, JOURNAL_DATA);
3380 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3381 set_opt(sb, ORDERED_DATA);
3382 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3383 set_opt(sb, WRITEBACK_DATA);
3384
3385 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3386 set_opt(sb, ERRORS_PANIC);
3387 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3388 set_opt(sb, ERRORS_CONT);
3389 else
3390 set_opt(sb, ERRORS_RO);
3391 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3392 set_opt(sb, BLOCK_VALIDITY);
3393 if (def_mount_opts & EXT4_DEFM_DISCARD)
3394 set_opt(sb, DISCARD);
3395
3396 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3397 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3398 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3399 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3400 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3401
3402 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3403 set_opt(sb, BARRIER);
3404
3405 /*
3406 * enable delayed allocation by default
3407 * Use -o nodelalloc to turn it off
3408 */
3409 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3410 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3411 set_opt(sb, DELALLOC);
3412
3413 /*
3414 * set default s_li_wait_mult for lazyinit, for the case there is
3415 * no mount option specified.
3416 */
3417 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3418
3419 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3420 &journal_devnum, &journal_ioprio, 0)) {
3421 ext4_msg(sb, KERN_WARNING,
3422 "failed to parse options in superblock: %s",
3423 sbi->s_es->s_mount_opts);
3424 }
3425 sbi->s_def_mount_opt = sbi->s_mount_opt;
3426 if (!parse_options((char *) data, sb, &journal_devnum,
3427 &journal_ioprio, 0))
3428 goto failed_mount;
3429
3430 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3431 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3432 "with data=journal disables delayed "
3433 "allocation and O_DIRECT support!\n");
3434 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3435 ext4_msg(sb, KERN_ERR, "can't mount with "
3436 "both data=journal and delalloc");
3437 goto failed_mount;
3438 }
3439 if (test_opt(sb, DIOREAD_NOLOCK)) {
3440 ext4_msg(sb, KERN_ERR, "can't mount with "
3441 "both data=journal and delalloc");
3442 goto failed_mount;
3443 }
3444 if (test_opt(sb, DELALLOC))
3445 clear_opt(sb, DELALLOC);
3446 }
3447
3448 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3449 if (test_opt(sb, DIOREAD_NOLOCK)) {
3450 if (blocksize < PAGE_SIZE) {
3451 ext4_msg(sb, KERN_ERR, "can't mount with "
3452 "dioread_nolock if block size != PAGE_SIZE");
3453 goto failed_mount;
3454 }
3455 }
3456
3457 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3458 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3459
3460 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3461 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3462 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3463 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3464 ext4_msg(sb, KERN_WARNING,
3465 "feature flags set on rev 0 fs, "
3466 "running e2fsck is recommended");
3467
3468 if (IS_EXT2_SB(sb)) {
3469 if (ext2_feature_set_ok(sb))
3470 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3471 "using the ext4 subsystem");
3472 else {
3473 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3474 "to feature incompatibilities");
3475 goto failed_mount;
3476 }
3477 }
3478
3479 if (IS_EXT3_SB(sb)) {
3480 if (ext3_feature_set_ok(sb))
3481 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3482 "using the ext4 subsystem");
3483 else {
3484 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3485 "to feature incompatibilities");
3486 goto failed_mount;
3487 }
3488 }
3489
3490 /*
3491 * Check feature flags regardless of the revision level, since we
3492 * previously didn't change the revision level when setting the flags,
3493 * so there is a chance incompat flags are set on a rev 0 filesystem.
3494 */
3495 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3496 goto failed_mount;
3497
3498 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3499 blocksize > EXT4_MAX_BLOCK_SIZE) {
3500 ext4_msg(sb, KERN_ERR,
3501 "Unsupported filesystem blocksize %d", blocksize);
3502 goto failed_mount;
3503 }
3504
3505 if (sb->s_blocksize != blocksize) {
3506 /* Validate the filesystem blocksize */
3507 if (!sb_set_blocksize(sb, blocksize)) {
3508 ext4_msg(sb, KERN_ERR, "bad block size %d",
3509 blocksize);
3510 goto failed_mount;
3511 }
3512
3513 brelse(bh);
3514 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3515 offset = do_div(logical_sb_block, blocksize);
3516 bh = sb_bread(sb, logical_sb_block);
3517 if (!bh) {
3518 ext4_msg(sb, KERN_ERR,
3519 "Can't read superblock on 2nd try");
3520 goto failed_mount;
3521 }
3522 es = (struct ext4_super_block *)(bh->b_data + offset);
3523 sbi->s_es = es;
3524 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3525 ext4_msg(sb, KERN_ERR,
3526 "Magic mismatch, very weird!");
3527 goto failed_mount;
3528 }
3529 }
3530
3531 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3532 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3533 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3534 has_huge_files);
3535 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3536
3537 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3538 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3539 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3540 } else {
3541 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3542 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3543 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3544 (!is_power_of_2(sbi->s_inode_size)) ||
3545 (sbi->s_inode_size > blocksize)) {
3546 ext4_msg(sb, KERN_ERR,
3547 "unsupported inode size: %d",
3548 sbi->s_inode_size);
3549 goto failed_mount;
3550 }
3551 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3552 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3553 }
3554
3555 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3556 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3557 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3558 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3559 !is_power_of_2(sbi->s_desc_size)) {
3560 ext4_msg(sb, KERN_ERR,
3561 "unsupported descriptor size %lu",
3562 sbi->s_desc_size);
3563 goto failed_mount;
3564 }
3565 } else
3566 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3567
3568 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3569 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3570 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3571 goto cantfind_ext4;
3572
3573 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3574 if (sbi->s_inodes_per_block == 0)
3575 goto cantfind_ext4;
3576 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3577 sbi->s_inodes_per_block;
3578 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3579 sbi->s_sbh = bh;
3580 sbi->s_mount_state = le16_to_cpu(es->s_state);
3581 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3582 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3583
3584 for (i = 0; i < 4; i++)
3585 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3586 sbi->s_def_hash_version = es->s_def_hash_version;
3587 i = le32_to_cpu(es->s_flags);
3588 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3589 sbi->s_hash_unsigned = 3;
3590 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3591 #ifdef __CHAR_UNSIGNED__
3592 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3593 sbi->s_hash_unsigned = 3;
3594 #else
3595 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3596 #endif
3597 }
3598
3599 /* Handle clustersize */
3600 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3601 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3602 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3603 if (has_bigalloc) {
3604 if (clustersize < blocksize) {
3605 ext4_msg(sb, KERN_ERR,
3606 "cluster size (%d) smaller than "
3607 "block size (%d)", clustersize, blocksize);
3608 goto failed_mount;
3609 }
3610 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3611 le32_to_cpu(es->s_log_block_size);
3612 sbi->s_clusters_per_group =
3613 le32_to_cpu(es->s_clusters_per_group);
3614 if (sbi->s_clusters_per_group > blocksize * 8) {
3615 ext4_msg(sb, KERN_ERR,
3616 "#clusters per group too big: %lu",
3617 sbi->s_clusters_per_group);
3618 goto failed_mount;
3619 }
3620 if (sbi->s_blocks_per_group !=
3621 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3622 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3623 "clusters per group (%lu) inconsistent",
3624 sbi->s_blocks_per_group,
3625 sbi->s_clusters_per_group);
3626 goto failed_mount;
3627 }
3628 } else {
3629 if (clustersize != blocksize) {
3630 ext4_warning(sb, "fragment/cluster size (%d) != "
3631 "block size (%d)", clustersize,
3632 blocksize);
3633 clustersize = blocksize;
3634 }
3635 if (sbi->s_blocks_per_group > blocksize * 8) {
3636 ext4_msg(sb, KERN_ERR,
3637 "#blocks per group too big: %lu",
3638 sbi->s_blocks_per_group);
3639 goto failed_mount;
3640 }
3641 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3642 sbi->s_cluster_bits = 0;
3643 }
3644 sbi->s_cluster_ratio = clustersize / blocksize;
3645
3646 if (sbi->s_inodes_per_group > blocksize * 8) {
3647 ext4_msg(sb, KERN_ERR,
3648 "#inodes per group too big: %lu",
3649 sbi->s_inodes_per_group);
3650 goto failed_mount;
3651 }
3652
3653 /*
3654 * Test whether we have more sectors than will fit in sector_t,
3655 * and whether the max offset is addressable by the page cache.
3656 */
3657 err = generic_check_addressable(sb->s_blocksize_bits,
3658 ext4_blocks_count(es));
3659 if (err) {
3660 ext4_msg(sb, KERN_ERR, "filesystem"
3661 " too large to mount safely on this system");
3662 if (sizeof(sector_t) < 8)
3663 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3664 ret = err;
3665 goto failed_mount;
3666 }
3667
3668 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3669 goto cantfind_ext4;
3670
3671 /* check blocks count against device size */
3672 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3673 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3674 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3675 "exceeds size of device (%llu blocks)",
3676 ext4_blocks_count(es), blocks_count);
3677 goto failed_mount;
3678 }
3679
3680 /*
3681 * It makes no sense for the first data block to be beyond the end
3682 * of the filesystem.
3683 */
3684 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3685 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3686 "block %u is beyond end of filesystem (%llu)",
3687 le32_to_cpu(es->s_first_data_block),
3688 ext4_blocks_count(es));
3689 goto failed_mount;
3690 }
3691 blocks_count = (ext4_blocks_count(es) -
3692 le32_to_cpu(es->s_first_data_block) +
3693 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3694 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3695 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3696 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3697 "(block count %llu, first data block %u, "
3698 "blocks per group %lu)", sbi->s_groups_count,
3699 ext4_blocks_count(es),
3700 le32_to_cpu(es->s_first_data_block),
3701 EXT4_BLOCKS_PER_GROUP(sb));
3702 goto failed_mount;
3703 }
3704 sbi->s_groups_count = blocks_count;
3705 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3706 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3707 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3708 EXT4_DESC_PER_BLOCK(sb);
3709 sbi->s_group_desc = ext4_kvmalloc(db_count *
3710 sizeof(struct buffer_head *),
3711 GFP_KERNEL);
3712 if (sbi->s_group_desc == NULL) {
3713 ext4_msg(sb, KERN_ERR, "not enough memory");
3714 ret = -ENOMEM;
3715 goto failed_mount;
3716 }
3717
3718 if (ext4_proc_root)
3719 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3720
3721 if (sbi->s_proc)
3722 proc_create_data("options", S_IRUGO, sbi->s_proc,
3723 &ext4_seq_options_fops, sb);
3724
3725 bgl_lock_init(sbi->s_blockgroup_lock);
3726
3727 for (i = 0; i < db_count; i++) {
3728 block = descriptor_loc(sb, logical_sb_block, i);
3729 sbi->s_group_desc[i] = sb_bread(sb, block);
3730 if (!sbi->s_group_desc[i]) {
3731 ext4_msg(sb, KERN_ERR,
3732 "can't read group descriptor %d", i);
3733 db_count = i;
3734 goto failed_mount2;
3735 }
3736 }
3737 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3738 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3739 goto failed_mount2;
3740 }
3741 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3742 if (!ext4_fill_flex_info(sb)) {
3743 ext4_msg(sb, KERN_ERR,
3744 "unable to initialize "
3745 "flex_bg meta info!");
3746 goto failed_mount2;
3747 }
3748
3749 sbi->s_gdb_count = db_count;
3750 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3751 spin_lock_init(&sbi->s_next_gen_lock);
3752
3753 init_timer(&sbi->s_err_report);
3754 sbi->s_err_report.function = print_daily_error_info;
3755 sbi->s_err_report.data = (unsigned long) sb;
3756
3757 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3758 ext4_count_free_clusters(sb));
3759 if (!err) {
3760 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3761 ext4_count_free_inodes(sb));
3762 }
3763 if (!err) {
3764 err = percpu_counter_init(&sbi->s_dirs_counter,
3765 ext4_count_dirs(sb));
3766 }
3767 if (!err) {
3768 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3769 }
3770 if (err) {
3771 ext4_msg(sb, KERN_ERR, "insufficient memory");
3772 ret = err;
3773 goto failed_mount3;
3774 }
3775
3776 sbi->s_stripe = ext4_get_stripe_size(sbi);
3777 sbi->s_max_writeback_mb_bump = 128;
3778 sbi->s_extent_max_zeroout_kb = 32;
3779
3780 /*
3781 * set up enough so that it can read an inode
3782 */
3783 if (!test_opt(sb, NOLOAD) &&
3784 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3785 sb->s_op = &ext4_sops;
3786 else
3787 sb->s_op = &ext4_nojournal_sops;
3788 sb->s_export_op = &ext4_export_ops;
3789 sb->s_xattr = ext4_xattr_handlers;
3790 #ifdef CONFIG_QUOTA
3791 sb->s_qcop = &ext4_qctl_operations;
3792 sb->dq_op = &ext4_quota_operations;
3793
3794 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
3795 /* Use qctl operations for hidden quota files. */
3796 sb->s_qcop = &ext4_qctl_sysfile_operations;
3797 }
3798 #endif
3799 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3800
3801 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3802 mutex_init(&sbi->s_orphan_lock);
3803 sbi->s_resize_flags = 0;
3804
3805 sb->s_root = NULL;
3806
3807 needs_recovery = (es->s_last_orphan != 0 ||
3808 EXT4_HAS_INCOMPAT_FEATURE(sb,
3809 EXT4_FEATURE_INCOMPAT_RECOVER));
3810
3811 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3812 !(sb->s_flags & MS_RDONLY))
3813 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3814 goto failed_mount3;
3815
3816 /*
3817 * The first inode we look at is the journal inode. Don't try
3818 * root first: it may be modified in the journal!
3819 */
3820 if (!test_opt(sb, NOLOAD) &&
3821 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3822 if (ext4_load_journal(sb, es, journal_devnum))
3823 goto failed_mount3;
3824 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3825 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3826 ext4_msg(sb, KERN_ERR, "required journal recovery "
3827 "suppressed and not mounted read-only");
3828 goto failed_mount_wq;
3829 } else {
3830 clear_opt(sb, DATA_FLAGS);
3831 sbi->s_journal = NULL;
3832 needs_recovery = 0;
3833 goto no_journal;
3834 }
3835
3836 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3837 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3838 JBD2_FEATURE_INCOMPAT_64BIT)) {
3839 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3840 goto failed_mount_wq;
3841 }
3842
3843 if (!set_journal_csum_feature_set(sb)) {
3844 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3845 "feature set");
3846 goto failed_mount_wq;
3847 }
3848
3849 /* We have now updated the journal if required, so we can
3850 * validate the data journaling mode. */
3851 switch (test_opt(sb, DATA_FLAGS)) {
3852 case 0:
3853 /* No mode set, assume a default based on the journal
3854 * capabilities: ORDERED_DATA if the journal can
3855 * cope, else JOURNAL_DATA
3856 */
3857 if (jbd2_journal_check_available_features
3858 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3859 set_opt(sb, ORDERED_DATA);
3860 else
3861 set_opt(sb, JOURNAL_DATA);
3862 break;
3863
3864 case EXT4_MOUNT_ORDERED_DATA:
3865 case EXT4_MOUNT_WRITEBACK_DATA:
3866 if (!jbd2_journal_check_available_features
3867 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3868 ext4_msg(sb, KERN_ERR, "Journal does not support "
3869 "requested data journaling mode");
3870 goto failed_mount_wq;
3871 }
3872 default:
3873 break;
3874 }
3875 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3876
3877 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3878
3879 /*
3880 * The journal may have updated the bg summary counts, so we
3881 * need to update the global counters.
3882 */
3883 percpu_counter_set(&sbi->s_freeclusters_counter,
3884 ext4_count_free_clusters(sb));
3885 percpu_counter_set(&sbi->s_freeinodes_counter,
3886 ext4_count_free_inodes(sb));
3887 percpu_counter_set(&sbi->s_dirs_counter,
3888 ext4_count_dirs(sb));
3889 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3890
3891 no_journal:
3892 /*
3893 * Get the # of file system overhead blocks from the
3894 * superblock if present.
3895 */
3896 if (es->s_overhead_clusters)
3897 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3898 else {
3899 ret = ext4_calculate_overhead(sb);
3900 if (ret)
3901 goto failed_mount_wq;
3902 }
3903
3904 /*
3905 * The maximum number of concurrent works can be high and
3906 * concurrency isn't really necessary. Limit it to 1.
3907 */
3908 EXT4_SB(sb)->dio_unwritten_wq =
3909 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3910 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3911 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3912 goto failed_mount_wq;
3913 }
3914
3915 /*
3916 * The jbd2_journal_load will have done any necessary log recovery,
3917 * so we can safely mount the rest of the filesystem now.
3918 */
3919
3920 root = ext4_iget(sb, EXT4_ROOT_INO);
3921 if (IS_ERR(root)) {
3922 ext4_msg(sb, KERN_ERR, "get root inode failed");
3923 ret = PTR_ERR(root);
3924 root = NULL;
3925 goto failed_mount4;
3926 }
3927 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3928 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3929 iput(root);
3930 goto failed_mount4;
3931 }
3932 sb->s_root = d_make_root(root);
3933 if (!sb->s_root) {
3934 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3935 ret = -ENOMEM;
3936 goto failed_mount4;
3937 }
3938
3939 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3940 sb->s_flags |= MS_RDONLY;
3941
3942 /* determine the minimum size of new large inodes, if present */
3943 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3944 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3945 EXT4_GOOD_OLD_INODE_SIZE;
3946 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3947 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3948 if (sbi->s_want_extra_isize <
3949 le16_to_cpu(es->s_want_extra_isize))
3950 sbi->s_want_extra_isize =
3951 le16_to_cpu(es->s_want_extra_isize);
3952 if (sbi->s_want_extra_isize <
3953 le16_to_cpu(es->s_min_extra_isize))
3954 sbi->s_want_extra_isize =
3955 le16_to_cpu(es->s_min_extra_isize);
3956 }
3957 }
3958 /* Check if enough inode space is available */
3959 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3960 sbi->s_inode_size) {
3961 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3962 EXT4_GOOD_OLD_INODE_SIZE;
3963 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3964 "available");
3965 }
3966
3967 err = ext4_setup_system_zone(sb);
3968 if (err) {
3969 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3970 "zone (%d)", err);
3971 goto failed_mount4a;
3972 }
3973
3974 ext4_ext_init(sb);
3975 err = ext4_mb_init(sb);
3976 if (err) {
3977 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3978 err);
3979 goto failed_mount5;
3980 }
3981
3982 err = ext4_register_li_request(sb, first_not_zeroed);
3983 if (err)
3984 goto failed_mount6;
3985
3986 sbi->s_kobj.kset = ext4_kset;
3987 init_completion(&sbi->s_kobj_unregister);
3988 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3989 "%s", sb->s_id);
3990 if (err)
3991 goto failed_mount7;
3992
3993 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3994 ext4_orphan_cleanup(sb, es);
3995 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3996 if (needs_recovery) {
3997 ext4_msg(sb, KERN_INFO, "recovery complete");
3998 ext4_mark_recovery_complete(sb, es);
3999 }
4000 if (EXT4_SB(sb)->s_journal) {
4001 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4002 descr = " journalled data mode";
4003 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4004 descr = " ordered data mode";
4005 else
4006 descr = " writeback data mode";
4007 } else
4008 descr = "out journal";
4009
4010 #ifdef CONFIG_QUOTA
4011 /* Enable quota usage during mount. */
4012 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4013 !(sb->s_flags & MS_RDONLY)) {
4014 ret = ext4_enable_quotas(sb);
4015 if (ret)
4016 goto failed_mount7;
4017 }
4018 #endif /* CONFIG_QUOTA */
4019
4020 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4021 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4022 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4023
4024 if (es->s_error_count)
4025 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4026
4027 kfree(orig_data);
4028 return 0;
4029
4030 cantfind_ext4:
4031 if (!silent)
4032 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4033 goto failed_mount;
4034
4035 failed_mount7:
4036 ext4_unregister_li_request(sb);
4037 failed_mount6:
4038 ext4_mb_release(sb);
4039 failed_mount5:
4040 ext4_ext_release(sb);
4041 ext4_release_system_zone(sb);
4042 failed_mount4a:
4043 dput(sb->s_root);
4044 sb->s_root = NULL;
4045 failed_mount4:
4046 ext4_msg(sb, KERN_ERR, "mount failed");
4047 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4048 failed_mount_wq:
4049 if (sbi->s_journal) {
4050 jbd2_journal_destroy(sbi->s_journal);
4051 sbi->s_journal = NULL;
4052 }
4053 failed_mount3:
4054 del_timer(&sbi->s_err_report);
4055 if (sbi->s_flex_groups)
4056 ext4_kvfree(sbi->s_flex_groups);
4057 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4058 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4059 percpu_counter_destroy(&sbi->s_dirs_counter);
4060 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4061 if (sbi->s_mmp_tsk)
4062 kthread_stop(sbi->s_mmp_tsk);
4063 failed_mount2:
4064 for (i = 0; i < db_count; i++)
4065 brelse(sbi->s_group_desc[i]);
4066 ext4_kvfree(sbi->s_group_desc);
4067 failed_mount:
4068 if (sbi->s_chksum_driver)
4069 crypto_free_shash(sbi->s_chksum_driver);
4070 if (sbi->s_proc) {
4071 remove_proc_entry("options", sbi->s_proc);
4072 remove_proc_entry(sb->s_id, ext4_proc_root);
4073 }
4074 #ifdef CONFIG_QUOTA
4075 for (i = 0; i < MAXQUOTAS; i++)
4076 kfree(sbi->s_qf_names[i]);
4077 #endif
4078 ext4_blkdev_remove(sbi);
4079 brelse(bh);
4080 out_fail:
4081 sb->s_fs_info = NULL;
4082 kfree(sbi->s_blockgroup_lock);
4083 kfree(sbi);
4084 out_free_orig:
4085 kfree(orig_data);
4086 return ret;
4087 }
4088
4089 /*
4090 * Setup any per-fs journal parameters now. We'll do this both on
4091 * initial mount, once the journal has been initialised but before we've
4092 * done any recovery; and again on any subsequent remount.
4093 */
4094 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4095 {
4096 struct ext4_sb_info *sbi = EXT4_SB(sb);
4097
4098 journal->j_commit_interval = sbi->s_commit_interval;
4099 journal->j_min_batch_time = sbi->s_min_batch_time;
4100 journal->j_max_batch_time = sbi->s_max_batch_time;
4101
4102 write_lock(&journal->j_state_lock);
4103 if (test_opt(sb, BARRIER))
4104 journal->j_flags |= JBD2_BARRIER;
4105 else
4106 journal->j_flags &= ~JBD2_BARRIER;
4107 if (test_opt(sb, DATA_ERR_ABORT))
4108 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4109 else
4110 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4111 write_unlock(&journal->j_state_lock);
4112 }
4113
4114 static journal_t *ext4_get_journal(struct super_block *sb,
4115 unsigned int journal_inum)
4116 {
4117 struct inode *journal_inode;
4118 journal_t *journal;
4119
4120 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4121
4122 /* First, test for the existence of a valid inode on disk. Bad
4123 * things happen if we iget() an unused inode, as the subsequent
4124 * iput() will try to delete it. */
4125
4126 journal_inode = ext4_iget(sb, journal_inum);
4127 if (IS_ERR(journal_inode)) {
4128 ext4_msg(sb, KERN_ERR, "no journal found");
4129 return NULL;
4130 }
4131 if (!journal_inode->i_nlink) {
4132 make_bad_inode(journal_inode);
4133 iput(journal_inode);
4134 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4135 return NULL;
4136 }
4137
4138 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4139 journal_inode, journal_inode->i_size);
4140 if (!S_ISREG(journal_inode->i_mode)) {
4141 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4142 iput(journal_inode);
4143 return NULL;
4144 }
4145
4146 journal = jbd2_journal_init_inode(journal_inode);
4147 if (!journal) {
4148 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4149 iput(journal_inode);
4150 return NULL;
4151 }
4152 journal->j_private = sb;
4153 ext4_init_journal_params(sb, journal);
4154 return journal;
4155 }
4156
4157 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4158 dev_t j_dev)
4159 {
4160 struct buffer_head *bh;
4161 journal_t *journal;
4162 ext4_fsblk_t start;
4163 ext4_fsblk_t len;
4164 int hblock, blocksize;
4165 ext4_fsblk_t sb_block;
4166 unsigned long offset;
4167 struct ext4_super_block *es;
4168 struct block_device *bdev;
4169
4170 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4171
4172 bdev = ext4_blkdev_get(j_dev, sb);
4173 if (bdev == NULL)
4174 return NULL;
4175
4176 blocksize = sb->s_blocksize;
4177 hblock = bdev_logical_block_size(bdev);
4178 if (blocksize < hblock) {
4179 ext4_msg(sb, KERN_ERR,
4180 "blocksize too small for journal device");
4181 goto out_bdev;
4182 }
4183
4184 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4185 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4186 set_blocksize(bdev, blocksize);
4187 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4188 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4189 "external journal");
4190 goto out_bdev;
4191 }
4192
4193 es = (struct ext4_super_block *) (bh->b_data + offset);
4194 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4195 !(le32_to_cpu(es->s_feature_incompat) &
4196 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4197 ext4_msg(sb, KERN_ERR, "external journal has "
4198 "bad superblock");
4199 brelse(bh);
4200 goto out_bdev;
4201 }
4202
4203 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4204 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4205 brelse(bh);
4206 goto out_bdev;
4207 }
4208
4209 len = ext4_blocks_count(es);
4210 start = sb_block + 1;
4211 brelse(bh); /* we're done with the superblock */
4212
4213 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4214 start, len, blocksize);
4215 if (!journal) {
4216 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4217 goto out_bdev;
4218 }
4219 journal->j_private = sb;
4220 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4221 wait_on_buffer(journal->j_sb_buffer);
4222 if (!buffer_uptodate(journal->j_sb_buffer)) {
4223 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4224 goto out_journal;
4225 }
4226 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4227 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4228 "user (unsupported) - %d",
4229 be32_to_cpu(journal->j_superblock->s_nr_users));
4230 goto out_journal;
4231 }
4232 EXT4_SB(sb)->journal_bdev = bdev;
4233 ext4_init_journal_params(sb, journal);
4234 return journal;
4235
4236 out_journal:
4237 jbd2_journal_destroy(journal);
4238 out_bdev:
4239 ext4_blkdev_put(bdev);
4240 return NULL;
4241 }
4242
4243 static int ext4_load_journal(struct super_block *sb,
4244 struct ext4_super_block *es,
4245 unsigned long journal_devnum)
4246 {
4247 journal_t *journal;
4248 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4249 dev_t journal_dev;
4250 int err = 0;
4251 int really_read_only;
4252
4253 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4254
4255 if (journal_devnum &&
4256 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4257 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4258 "numbers have changed");
4259 journal_dev = new_decode_dev(journal_devnum);
4260 } else
4261 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4262
4263 really_read_only = bdev_read_only(sb->s_bdev);
4264
4265 /*
4266 * Are we loading a blank journal or performing recovery after a
4267 * crash? For recovery, we need to check in advance whether we
4268 * can get read-write access to the device.
4269 */
4270 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4271 if (sb->s_flags & MS_RDONLY) {
4272 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4273 "required on readonly filesystem");
4274 if (really_read_only) {
4275 ext4_msg(sb, KERN_ERR, "write access "
4276 "unavailable, cannot proceed");
4277 return -EROFS;
4278 }
4279 ext4_msg(sb, KERN_INFO, "write access will "
4280 "be enabled during recovery");
4281 }
4282 }
4283
4284 if (journal_inum && journal_dev) {
4285 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4286 "and inode journals!");
4287 return -EINVAL;
4288 }
4289
4290 if (journal_inum) {
4291 if (!(journal = ext4_get_journal(sb, journal_inum)))
4292 return -EINVAL;
4293 } else {
4294 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4295 return -EINVAL;
4296 }
4297
4298 if (!(journal->j_flags & JBD2_BARRIER))
4299 ext4_msg(sb, KERN_INFO, "barriers disabled");
4300
4301 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4302 err = jbd2_journal_wipe(journal, !really_read_only);
4303 if (!err) {
4304 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4305 if (save)
4306 memcpy(save, ((char *) es) +
4307 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4308 err = jbd2_journal_load(journal);
4309 if (save)
4310 memcpy(((char *) es) + EXT4_S_ERR_START,
4311 save, EXT4_S_ERR_LEN);
4312 kfree(save);
4313 }
4314
4315 if (err) {
4316 ext4_msg(sb, KERN_ERR, "error loading journal");
4317 jbd2_journal_destroy(journal);
4318 return err;
4319 }
4320
4321 EXT4_SB(sb)->s_journal = journal;
4322 ext4_clear_journal_err(sb, es);
4323
4324 if (!really_read_only && journal_devnum &&
4325 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4326 es->s_journal_dev = cpu_to_le32(journal_devnum);
4327
4328 /* Make sure we flush the recovery flag to disk. */
4329 ext4_commit_super(sb, 1);
4330 }
4331
4332 return 0;
4333 }
4334
4335 static int ext4_commit_super(struct super_block *sb, int sync)
4336 {
4337 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4338 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4339 int error = 0;
4340
4341 if (!sbh || block_device_ejected(sb))
4342 return error;
4343 if (buffer_write_io_error(sbh)) {
4344 /*
4345 * Oh, dear. A previous attempt to write the
4346 * superblock failed. This could happen because the
4347 * USB device was yanked out. Or it could happen to
4348 * be a transient write error and maybe the block will
4349 * be remapped. Nothing we can do but to retry the
4350 * write and hope for the best.
4351 */
4352 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4353 "superblock detected");
4354 clear_buffer_write_io_error(sbh);
4355 set_buffer_uptodate(sbh);
4356 }
4357 /*
4358 * If the file system is mounted read-only, don't update the
4359 * superblock write time. This avoids updating the superblock
4360 * write time when we are mounting the root file system
4361 * read/only but we need to replay the journal; at that point,
4362 * for people who are east of GMT and who make their clock
4363 * tick in localtime for Windows bug-for-bug compatibility,
4364 * the clock is set in the future, and this will cause e2fsck
4365 * to complain and force a full file system check.
4366 */
4367 if (!(sb->s_flags & MS_RDONLY))
4368 es->s_wtime = cpu_to_le32(get_seconds());
4369 if (sb->s_bdev->bd_part)
4370 es->s_kbytes_written =
4371 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4372 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4373 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4374 else
4375 es->s_kbytes_written =
4376 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4377 ext4_free_blocks_count_set(es,
4378 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4379 &EXT4_SB(sb)->s_freeclusters_counter)));
4380 es->s_free_inodes_count =
4381 cpu_to_le32(percpu_counter_sum_positive(
4382 &EXT4_SB(sb)->s_freeinodes_counter));
4383 BUFFER_TRACE(sbh, "marking dirty");
4384 ext4_superblock_csum_set(sb, es);
4385 mark_buffer_dirty(sbh);
4386 if (sync) {
4387 error = sync_dirty_buffer(sbh);
4388 if (error)
4389 return error;
4390
4391 error = buffer_write_io_error(sbh);
4392 if (error) {
4393 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4394 "superblock");
4395 clear_buffer_write_io_error(sbh);
4396 set_buffer_uptodate(sbh);
4397 }
4398 }
4399 return error;
4400 }
4401
4402 /*
4403 * Have we just finished recovery? If so, and if we are mounting (or
4404 * remounting) the filesystem readonly, then we will end up with a
4405 * consistent fs on disk. Record that fact.
4406 */
4407 static void ext4_mark_recovery_complete(struct super_block *sb,
4408 struct ext4_super_block *es)
4409 {
4410 journal_t *journal = EXT4_SB(sb)->s_journal;
4411
4412 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4413 BUG_ON(journal != NULL);
4414 return;
4415 }
4416 jbd2_journal_lock_updates(journal);
4417 if (jbd2_journal_flush(journal) < 0)
4418 goto out;
4419
4420 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4421 sb->s_flags & MS_RDONLY) {
4422 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4423 ext4_commit_super(sb, 1);
4424 }
4425
4426 out:
4427 jbd2_journal_unlock_updates(journal);
4428 }
4429
4430 /*
4431 * If we are mounting (or read-write remounting) a filesystem whose journal
4432 * has recorded an error from a previous lifetime, move that error to the
4433 * main filesystem now.
4434 */
4435 static void ext4_clear_journal_err(struct super_block *sb,
4436 struct ext4_super_block *es)
4437 {
4438 journal_t *journal;
4439 int j_errno;
4440 const char *errstr;
4441
4442 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4443
4444 journal = EXT4_SB(sb)->s_journal;
4445
4446 /*
4447 * Now check for any error status which may have been recorded in the
4448 * journal by a prior ext4_error() or ext4_abort()
4449 */
4450
4451 j_errno = jbd2_journal_errno(journal);
4452 if (j_errno) {
4453 char nbuf[16];
4454
4455 errstr = ext4_decode_error(sb, j_errno, nbuf);
4456 ext4_warning(sb, "Filesystem error recorded "
4457 "from previous mount: %s", errstr);
4458 ext4_warning(sb, "Marking fs in need of filesystem check.");
4459
4460 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4461 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4462 ext4_commit_super(sb, 1);
4463
4464 jbd2_journal_clear_err(journal);
4465 jbd2_journal_update_sb_errno(journal);
4466 }
4467 }
4468
4469 /*
4470 * Force the running and committing transactions to commit,
4471 * and wait on the commit.
4472 */
4473 int ext4_force_commit(struct super_block *sb)
4474 {
4475 journal_t *journal;
4476 int ret = 0;
4477
4478 if (sb->s_flags & MS_RDONLY)
4479 return 0;
4480
4481 journal = EXT4_SB(sb)->s_journal;
4482 if (journal)
4483 ret = ext4_journal_force_commit(journal);
4484
4485 return ret;
4486 }
4487
4488 static int ext4_sync_fs(struct super_block *sb, int wait)
4489 {
4490 int ret = 0;
4491 tid_t target;
4492 struct ext4_sb_info *sbi = EXT4_SB(sb);
4493
4494 trace_ext4_sync_fs(sb, wait);
4495 flush_workqueue(sbi->dio_unwritten_wq);
4496 /*
4497 * Writeback quota in non-journalled quota case - journalled quota has
4498 * no dirty dquots
4499 */
4500 dquot_writeback_dquots(sb, -1);
4501 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4502 if (wait)
4503 jbd2_log_wait_commit(sbi->s_journal, target);
4504 }
4505 return ret;
4506 }
4507
4508 /*
4509 * LVM calls this function before a (read-only) snapshot is created. This
4510 * gives us a chance to flush the journal completely and mark the fs clean.
4511 *
4512 * Note that only this function cannot bring a filesystem to be in a clean
4513 * state independently. It relies on upper layer to stop all data & metadata
4514 * modifications.
4515 */
4516 static int ext4_freeze(struct super_block *sb)
4517 {
4518 int error = 0;
4519 journal_t *journal;
4520
4521 if (sb->s_flags & MS_RDONLY)
4522 return 0;
4523
4524 journal = EXT4_SB(sb)->s_journal;
4525
4526 /* Now we set up the journal barrier. */
4527 jbd2_journal_lock_updates(journal);
4528
4529 /*
4530 * Don't clear the needs_recovery flag if we failed to flush
4531 * the journal.
4532 */
4533 error = jbd2_journal_flush(journal);
4534 if (error < 0)
4535 goto out;
4536
4537 /* Journal blocked and flushed, clear needs_recovery flag. */
4538 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4539 error = ext4_commit_super(sb, 1);
4540 out:
4541 /* we rely on upper layer to stop further updates */
4542 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4543 return error;
4544 }
4545
4546 /*
4547 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4548 * flag here, even though the filesystem is not technically dirty yet.
4549 */
4550 static int ext4_unfreeze(struct super_block *sb)
4551 {
4552 if (sb->s_flags & MS_RDONLY)
4553 return 0;
4554
4555 /* Reset the needs_recovery flag before the fs is unlocked. */
4556 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4557 ext4_commit_super(sb, 1);
4558 return 0;
4559 }
4560
4561 /*
4562 * Structure to save mount options for ext4_remount's benefit
4563 */
4564 struct ext4_mount_options {
4565 unsigned long s_mount_opt;
4566 unsigned long s_mount_opt2;
4567 kuid_t s_resuid;
4568 kgid_t s_resgid;
4569 unsigned long s_commit_interval;
4570 u32 s_min_batch_time, s_max_batch_time;
4571 #ifdef CONFIG_QUOTA
4572 int s_jquota_fmt;
4573 char *s_qf_names[MAXQUOTAS];
4574 #endif
4575 };
4576
4577 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4578 {
4579 struct ext4_super_block *es;
4580 struct ext4_sb_info *sbi = EXT4_SB(sb);
4581 unsigned long old_sb_flags;
4582 struct ext4_mount_options old_opts;
4583 int enable_quota = 0;
4584 ext4_group_t g;
4585 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4586 int err = 0;
4587 #ifdef CONFIG_QUOTA
4588 int i;
4589 #endif
4590 char *orig_data = kstrdup(data, GFP_KERNEL);
4591
4592 /* Store the original options */
4593 old_sb_flags = sb->s_flags;
4594 old_opts.s_mount_opt = sbi->s_mount_opt;
4595 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4596 old_opts.s_resuid = sbi->s_resuid;
4597 old_opts.s_resgid = sbi->s_resgid;
4598 old_opts.s_commit_interval = sbi->s_commit_interval;
4599 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4600 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4601 #ifdef CONFIG_QUOTA
4602 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4603 for (i = 0; i < MAXQUOTAS; i++)
4604 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4605 #endif
4606 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4607 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4608
4609 /*
4610 * Allow the "check" option to be passed as a remount option.
4611 */
4612 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4613 err = -EINVAL;
4614 goto restore_opts;
4615 }
4616
4617 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4618 ext4_abort(sb, "Abort forced by user");
4619
4620 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4621 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4622
4623 es = sbi->s_es;
4624
4625 if (sbi->s_journal) {
4626 ext4_init_journal_params(sb, sbi->s_journal);
4627 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4628 }
4629
4630 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4631 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4632 err = -EROFS;
4633 goto restore_opts;
4634 }
4635
4636 if (*flags & MS_RDONLY) {
4637 err = dquot_suspend(sb, -1);
4638 if (err < 0)
4639 goto restore_opts;
4640
4641 /*
4642 * First of all, the unconditional stuff we have to do
4643 * to disable replay of the journal when we next remount
4644 */
4645 sb->s_flags |= MS_RDONLY;
4646
4647 /*
4648 * OK, test if we are remounting a valid rw partition
4649 * readonly, and if so set the rdonly flag and then
4650 * mark the partition as valid again.
4651 */
4652 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4653 (sbi->s_mount_state & EXT4_VALID_FS))
4654 es->s_state = cpu_to_le16(sbi->s_mount_state);
4655
4656 if (sbi->s_journal)
4657 ext4_mark_recovery_complete(sb, es);
4658 } else {
4659 /* Make sure we can mount this feature set readwrite */
4660 if (!ext4_feature_set_ok(sb, 0)) {
4661 err = -EROFS;
4662 goto restore_opts;
4663 }
4664 /*
4665 * Make sure the group descriptor checksums
4666 * are sane. If they aren't, refuse to remount r/w.
4667 */
4668 for (g = 0; g < sbi->s_groups_count; g++) {
4669 struct ext4_group_desc *gdp =
4670 ext4_get_group_desc(sb, g, NULL);
4671
4672 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4673 ext4_msg(sb, KERN_ERR,
4674 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4675 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4676 le16_to_cpu(gdp->bg_checksum));
4677 err = -EINVAL;
4678 goto restore_opts;
4679 }
4680 }
4681
4682 /*
4683 * If we have an unprocessed orphan list hanging
4684 * around from a previously readonly bdev mount,
4685 * require a full umount/remount for now.
4686 */
4687 if (es->s_last_orphan) {
4688 ext4_msg(sb, KERN_WARNING, "Couldn't "
4689 "remount RDWR because of unprocessed "
4690 "orphan inode list. Please "
4691 "umount/remount instead");
4692 err = -EINVAL;
4693 goto restore_opts;
4694 }
4695
4696 /*
4697 * Mounting a RDONLY partition read-write, so reread
4698 * and store the current valid flag. (It may have
4699 * been changed by e2fsck since we originally mounted
4700 * the partition.)
4701 */
4702 if (sbi->s_journal)
4703 ext4_clear_journal_err(sb, es);
4704 sbi->s_mount_state = le16_to_cpu(es->s_state);
4705 if (!ext4_setup_super(sb, es, 0))
4706 sb->s_flags &= ~MS_RDONLY;
4707 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4708 EXT4_FEATURE_INCOMPAT_MMP))
4709 if (ext4_multi_mount_protect(sb,
4710 le64_to_cpu(es->s_mmp_block))) {
4711 err = -EROFS;
4712 goto restore_opts;
4713 }
4714 enable_quota = 1;
4715 }
4716 }
4717
4718 /*
4719 * Reinitialize lazy itable initialization thread based on
4720 * current settings
4721 */
4722 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4723 ext4_unregister_li_request(sb);
4724 else {
4725 ext4_group_t first_not_zeroed;
4726 first_not_zeroed = ext4_has_uninit_itable(sb);
4727 ext4_register_li_request(sb, first_not_zeroed);
4728 }
4729
4730 ext4_setup_system_zone(sb);
4731 if (sbi->s_journal == NULL)
4732 ext4_commit_super(sb, 1);
4733
4734 #ifdef CONFIG_QUOTA
4735 /* Release old quota file names */
4736 for (i = 0; i < MAXQUOTAS; i++)
4737 if (old_opts.s_qf_names[i] &&
4738 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4739 kfree(old_opts.s_qf_names[i]);
4740 if (enable_quota) {
4741 if (sb_any_quota_suspended(sb))
4742 dquot_resume(sb, -1);
4743 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4744 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4745 err = ext4_enable_quotas(sb);
4746 if (err)
4747 goto restore_opts;
4748 }
4749 }
4750 #endif
4751
4752 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4753 kfree(orig_data);
4754 return 0;
4755
4756 restore_opts:
4757 sb->s_flags = old_sb_flags;
4758 sbi->s_mount_opt = old_opts.s_mount_opt;
4759 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4760 sbi->s_resuid = old_opts.s_resuid;
4761 sbi->s_resgid = old_opts.s_resgid;
4762 sbi->s_commit_interval = old_opts.s_commit_interval;
4763 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4764 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4765 #ifdef CONFIG_QUOTA
4766 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4767 for (i = 0; i < MAXQUOTAS; i++) {
4768 if (sbi->s_qf_names[i] &&
4769 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4770 kfree(sbi->s_qf_names[i]);
4771 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4772 }
4773 #endif
4774 kfree(orig_data);
4775 return err;
4776 }
4777
4778 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4779 {
4780 struct super_block *sb = dentry->d_sb;
4781 struct ext4_sb_info *sbi = EXT4_SB(sb);
4782 struct ext4_super_block *es = sbi->s_es;
4783 ext4_fsblk_t overhead = 0;
4784 u64 fsid;
4785 s64 bfree;
4786
4787 if (!test_opt(sb, MINIX_DF))
4788 overhead = sbi->s_overhead;
4789
4790 buf->f_type = EXT4_SUPER_MAGIC;
4791 buf->f_bsize = sb->s_blocksize;
4792 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
4793 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4794 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4795 /* prevent underflow in case that few free space is available */
4796 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4797 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4798 if (buf->f_bfree < ext4_r_blocks_count(es))
4799 buf->f_bavail = 0;
4800 buf->f_files = le32_to_cpu(es->s_inodes_count);
4801 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4802 buf->f_namelen = EXT4_NAME_LEN;
4803 fsid = le64_to_cpup((void *)es->s_uuid) ^
4804 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4805 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4806 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4807
4808 return 0;
4809 }
4810
4811 /* Helper function for writing quotas on sync - we need to start transaction
4812 * before quota file is locked for write. Otherwise the are possible deadlocks:
4813 * Process 1 Process 2
4814 * ext4_create() quota_sync()
4815 * jbd2_journal_start() write_dquot()
4816 * dquot_initialize() down(dqio_mutex)
4817 * down(dqio_mutex) jbd2_journal_start()
4818 *
4819 */
4820
4821 #ifdef CONFIG_QUOTA
4822
4823 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4824 {
4825 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4826 }
4827
4828 static int ext4_write_dquot(struct dquot *dquot)
4829 {
4830 int ret, err;
4831 handle_t *handle;
4832 struct inode *inode;
4833
4834 inode = dquot_to_inode(dquot);
4835 handle = ext4_journal_start(inode,
4836 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4837 if (IS_ERR(handle))
4838 return PTR_ERR(handle);
4839 ret = dquot_commit(dquot);
4840 err = ext4_journal_stop(handle);
4841 if (!ret)
4842 ret = err;
4843 return ret;
4844 }
4845
4846 static int ext4_acquire_dquot(struct dquot *dquot)
4847 {
4848 int ret, err;
4849 handle_t *handle;
4850
4851 handle = ext4_journal_start(dquot_to_inode(dquot),
4852 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4853 if (IS_ERR(handle))
4854 return PTR_ERR(handle);
4855 ret = dquot_acquire(dquot);
4856 err = ext4_journal_stop(handle);
4857 if (!ret)
4858 ret = err;
4859 return ret;
4860 }
4861
4862 static int ext4_release_dquot(struct dquot *dquot)
4863 {
4864 int ret, err;
4865 handle_t *handle;
4866
4867 handle = ext4_journal_start(dquot_to_inode(dquot),
4868 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4869 if (IS_ERR(handle)) {
4870 /* Release dquot anyway to avoid endless cycle in dqput() */
4871 dquot_release(dquot);
4872 return PTR_ERR(handle);
4873 }
4874 ret = dquot_release(dquot);
4875 err = ext4_journal_stop(handle);
4876 if (!ret)
4877 ret = err;
4878 return ret;
4879 }
4880
4881 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4882 {
4883 /* Are we journaling quotas? */
4884 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4885 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4886 dquot_mark_dquot_dirty(dquot);
4887 return ext4_write_dquot(dquot);
4888 } else {
4889 return dquot_mark_dquot_dirty(dquot);
4890 }
4891 }
4892
4893 static int ext4_write_info(struct super_block *sb, int type)
4894 {
4895 int ret, err;
4896 handle_t *handle;
4897
4898 /* Data block + inode block */
4899 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4900 if (IS_ERR(handle))
4901 return PTR_ERR(handle);
4902 ret = dquot_commit_info(sb, type);
4903 err = ext4_journal_stop(handle);
4904 if (!ret)
4905 ret = err;
4906 return ret;
4907 }
4908
4909 /*
4910 * Turn on quotas during mount time - we need to find
4911 * the quota file and such...
4912 */
4913 static int ext4_quota_on_mount(struct super_block *sb, int type)
4914 {
4915 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4916 EXT4_SB(sb)->s_jquota_fmt, type);
4917 }
4918
4919 /*
4920 * Standard function to be called on quota_on
4921 */
4922 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4923 struct path *path)
4924 {
4925 int err;
4926
4927 if (!test_opt(sb, QUOTA))
4928 return -EINVAL;
4929
4930 /* Quotafile not on the same filesystem? */
4931 if (path->dentry->d_sb != sb)
4932 return -EXDEV;
4933 /* Journaling quota? */
4934 if (EXT4_SB(sb)->s_qf_names[type]) {
4935 /* Quotafile not in fs root? */
4936 if (path->dentry->d_parent != sb->s_root)
4937 ext4_msg(sb, KERN_WARNING,
4938 "Quota file not on filesystem root. "
4939 "Journaled quota will not work");
4940 }
4941
4942 /*
4943 * When we journal data on quota file, we have to flush journal to see
4944 * all updates to the file when we bypass pagecache...
4945 */
4946 if (EXT4_SB(sb)->s_journal &&
4947 ext4_should_journal_data(path->dentry->d_inode)) {
4948 /*
4949 * We don't need to lock updates but journal_flush() could
4950 * otherwise be livelocked...
4951 */
4952 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4953 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4954 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4955 if (err)
4956 return err;
4957 }
4958
4959 return dquot_quota_on(sb, type, format_id, path);
4960 }
4961
4962 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4963 unsigned int flags)
4964 {
4965 int err;
4966 struct inode *qf_inode;
4967 unsigned long qf_inums[MAXQUOTAS] = {
4968 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4969 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4970 };
4971
4972 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4973
4974 if (!qf_inums[type])
4975 return -EPERM;
4976
4977 qf_inode = ext4_iget(sb, qf_inums[type]);
4978 if (IS_ERR(qf_inode)) {
4979 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4980 return PTR_ERR(qf_inode);
4981 }
4982
4983 err = dquot_enable(qf_inode, type, format_id, flags);
4984 iput(qf_inode);
4985
4986 return err;
4987 }
4988
4989 /* Enable usage tracking for all quota types. */
4990 static int ext4_enable_quotas(struct super_block *sb)
4991 {
4992 int type, err = 0;
4993 unsigned long qf_inums[MAXQUOTAS] = {
4994 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4995 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4996 };
4997
4998 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
4999 for (type = 0; type < MAXQUOTAS; type++) {
5000 if (qf_inums[type]) {
5001 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5002 DQUOT_USAGE_ENABLED);
5003 if (err) {
5004 ext4_warning(sb,
5005 "Failed to enable quota (type=%d) "
5006 "tracking. Please run e2fsck to fix.",
5007 type);
5008 return err;
5009 }
5010 }
5011 }
5012 return 0;
5013 }
5014
5015 /*
5016 * quota_on function that is used when QUOTA feature is set.
5017 */
5018 static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5019 int format_id)
5020 {
5021 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5022 return -EINVAL;
5023
5024 /*
5025 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5026 */
5027 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5028 }
5029
5030 static int ext4_quota_off(struct super_block *sb, int type)
5031 {
5032 struct inode *inode = sb_dqopt(sb)->files[type];
5033 handle_t *handle;
5034
5035 /* Force all delayed allocation blocks to be allocated.
5036 * Caller already holds s_umount sem */
5037 if (test_opt(sb, DELALLOC))
5038 sync_filesystem(sb);
5039
5040 if (!inode)
5041 goto out;
5042
5043 /* Update modification times of quota files when userspace can
5044 * start looking at them */
5045 handle = ext4_journal_start(inode, 1);
5046 if (IS_ERR(handle))
5047 goto out;
5048 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5049 ext4_mark_inode_dirty(handle, inode);
5050 ext4_journal_stop(handle);
5051
5052 out:
5053 return dquot_quota_off(sb, type);
5054 }
5055
5056 /*
5057 * quota_off function that is used when QUOTA feature is set.
5058 */
5059 static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5060 {
5061 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5062 return -EINVAL;
5063
5064 /* Disable only the limits. */
5065 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5066 }
5067
5068 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5069 * acquiring the locks... As quota files are never truncated and quota code
5070 * itself serializes the operations (and no one else should touch the files)
5071 * we don't have to be afraid of races */
5072 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5073 size_t len, loff_t off)
5074 {
5075 struct inode *inode = sb_dqopt(sb)->files[type];
5076 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5077 int err = 0;
5078 int offset = off & (sb->s_blocksize - 1);
5079 int tocopy;
5080 size_t toread;
5081 struct buffer_head *bh;
5082 loff_t i_size = i_size_read(inode);
5083
5084 if (off > i_size)
5085 return 0;
5086 if (off+len > i_size)
5087 len = i_size-off;
5088 toread = len;
5089 while (toread > 0) {
5090 tocopy = sb->s_blocksize - offset < toread ?
5091 sb->s_blocksize - offset : toread;
5092 bh = ext4_bread(NULL, inode, blk, 0, &err);
5093 if (err)
5094 return err;
5095 if (!bh) /* A hole? */
5096 memset(data, 0, tocopy);
5097 else
5098 memcpy(data, bh->b_data+offset, tocopy);
5099 brelse(bh);
5100 offset = 0;
5101 toread -= tocopy;
5102 data += tocopy;
5103 blk++;
5104 }
5105 return len;
5106 }
5107
5108 /* Write to quotafile (we know the transaction is already started and has
5109 * enough credits) */
5110 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5111 const char *data, size_t len, loff_t off)
5112 {
5113 struct inode *inode = sb_dqopt(sb)->files[type];
5114 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5115 int err = 0;
5116 int offset = off & (sb->s_blocksize - 1);
5117 struct buffer_head *bh;
5118 handle_t *handle = journal_current_handle();
5119
5120 if (EXT4_SB(sb)->s_journal && !handle) {
5121 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5122 " cancelled because transaction is not started",
5123 (unsigned long long)off, (unsigned long long)len);
5124 return -EIO;
5125 }
5126 /*
5127 * Since we account only one data block in transaction credits,
5128 * then it is impossible to cross a block boundary.
5129 */
5130 if (sb->s_blocksize - offset < len) {
5131 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5132 " cancelled because not block aligned",
5133 (unsigned long long)off, (unsigned long long)len);
5134 return -EIO;
5135 }
5136
5137 bh = ext4_bread(handle, inode, blk, 1, &err);
5138 if (!bh)
5139 goto out;
5140 err = ext4_journal_get_write_access(handle, bh);
5141 if (err) {
5142 brelse(bh);
5143 goto out;
5144 }
5145 lock_buffer(bh);
5146 memcpy(bh->b_data+offset, data, len);
5147 flush_dcache_page(bh->b_page);
5148 unlock_buffer(bh);
5149 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5150 brelse(bh);
5151 out:
5152 if (err)
5153 return err;
5154 if (inode->i_size < off + len) {
5155 i_size_write(inode, off + len);
5156 EXT4_I(inode)->i_disksize = inode->i_size;
5157 ext4_mark_inode_dirty(handle, inode);
5158 }
5159 return len;
5160 }
5161
5162 #endif
5163
5164 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5165 const char *dev_name, void *data)
5166 {
5167 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5168 }
5169
5170 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5171 static inline void register_as_ext2(void)
5172 {
5173 int err = register_filesystem(&ext2_fs_type);
5174 if (err)
5175 printk(KERN_WARNING
5176 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5177 }
5178
5179 static inline void unregister_as_ext2(void)
5180 {
5181 unregister_filesystem(&ext2_fs_type);
5182 }
5183
5184 static inline int ext2_feature_set_ok(struct super_block *sb)
5185 {
5186 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5187 return 0;
5188 if (sb->s_flags & MS_RDONLY)
5189 return 1;
5190 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5191 return 0;
5192 return 1;
5193 }
5194 MODULE_ALIAS("ext2");
5195 #else
5196 static inline void register_as_ext2(void) { }
5197 static inline void unregister_as_ext2(void) { }
5198 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5199 #endif
5200
5201 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5202 static inline void register_as_ext3(void)
5203 {
5204 int err = register_filesystem(&ext3_fs_type);
5205 if (err)
5206 printk(KERN_WARNING
5207 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5208 }
5209
5210 static inline void unregister_as_ext3(void)
5211 {
5212 unregister_filesystem(&ext3_fs_type);
5213 }
5214
5215 static inline int ext3_feature_set_ok(struct super_block *sb)
5216 {
5217 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5218 return 0;
5219 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5220 return 0;
5221 if (sb->s_flags & MS_RDONLY)
5222 return 1;
5223 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5224 return 0;
5225 return 1;
5226 }
5227 MODULE_ALIAS("ext3");
5228 #else
5229 static inline void register_as_ext3(void) { }
5230 static inline void unregister_as_ext3(void) { }
5231 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5232 #endif
5233
5234 static struct file_system_type ext4_fs_type = {
5235 .owner = THIS_MODULE,
5236 .name = "ext4",
5237 .mount = ext4_mount,
5238 .kill_sb = kill_block_super,
5239 .fs_flags = FS_REQUIRES_DEV,
5240 };
5241
5242 static int __init ext4_init_feat_adverts(void)
5243 {
5244 struct ext4_features *ef;
5245 int ret = -ENOMEM;
5246
5247 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5248 if (!ef)
5249 goto out;
5250
5251 ef->f_kobj.kset = ext4_kset;
5252 init_completion(&ef->f_kobj_unregister);
5253 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5254 "features");
5255 if (ret) {
5256 kfree(ef);
5257 goto out;
5258 }
5259
5260 ext4_feat = ef;
5261 ret = 0;
5262 out:
5263 return ret;
5264 }
5265
5266 static void ext4_exit_feat_adverts(void)
5267 {
5268 kobject_put(&ext4_feat->f_kobj);
5269 wait_for_completion(&ext4_feat->f_kobj_unregister);
5270 kfree(ext4_feat);
5271 }
5272
5273 /* Shared across all ext4 file systems */
5274 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5275 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5276
5277 static int __init ext4_init_fs(void)
5278 {
5279 int i, err;
5280
5281 ext4_li_info = NULL;
5282 mutex_init(&ext4_li_mtx);
5283
5284 ext4_check_flag_values();
5285
5286 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5287 mutex_init(&ext4__aio_mutex[i]);
5288 init_waitqueue_head(&ext4__ioend_wq[i]);
5289 }
5290
5291 err = ext4_init_pageio();
5292 if (err)
5293 return err;
5294 err = ext4_init_system_zone();
5295 if (err)
5296 goto out6;
5297 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5298 if (!ext4_kset) {
5299 err = -ENOMEM;
5300 goto out5;
5301 }
5302 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5303
5304 err = ext4_init_feat_adverts();
5305 if (err)
5306 goto out4;
5307
5308 err = ext4_init_mballoc();
5309 if (err)
5310 goto out3;
5311
5312 err = ext4_init_xattr();
5313 if (err)
5314 goto out2;
5315 err = init_inodecache();
5316 if (err)
5317 goto out1;
5318 register_as_ext3();
5319 register_as_ext2();
5320 err = register_filesystem(&ext4_fs_type);
5321 if (err)
5322 goto out;
5323
5324 return 0;
5325 out:
5326 unregister_as_ext2();
5327 unregister_as_ext3();
5328 destroy_inodecache();
5329 out1:
5330 ext4_exit_xattr();
5331 out2:
5332 ext4_exit_mballoc();
5333 out3:
5334 ext4_exit_feat_adverts();
5335 out4:
5336 if (ext4_proc_root)
5337 remove_proc_entry("fs/ext4", NULL);
5338 kset_unregister(ext4_kset);
5339 out5:
5340 ext4_exit_system_zone();
5341 out6:
5342 ext4_exit_pageio();
5343 return err;
5344 }
5345
5346 static void __exit ext4_exit_fs(void)
5347 {
5348 ext4_destroy_lazyinit_thread();
5349 unregister_as_ext2();
5350 unregister_as_ext3();
5351 unregister_filesystem(&ext4_fs_type);
5352 destroy_inodecache();
5353 ext4_exit_xattr();
5354 ext4_exit_mballoc();
5355 ext4_exit_feat_adverts();
5356 remove_proc_entry("fs/ext4", NULL);
5357 kset_unregister(ext4_kset);
5358 ext4_exit_system_zone();
5359 ext4_exit_pageio();
5360 }
5361
5362 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5363 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5364 MODULE_LICENSE("GPL");
5365 module_init(ext4_init_fs)
5366 module_exit(ext4_exit_fs)
Linus' kernel tree