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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
57static struct proc_dir_entry *ext4_proc_root;
58static struct kset *ext4_kset;
59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
62
63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 unsigned long journal_devnum);
65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66static int ext4_commit_super(struct super_block *sb, int sync);
67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
71static int ext4_sync_fs(struct super_block *sb, int wait);
72static const char *ext4_decode_error(struct super_block *sb, int errno,
73 char nbuf[16]);
74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76static int ext4_unfreeze(struct super_block *sb);
77static int ext4_freeze(struct super_block *sb);
78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
85static void ext4_clear_request_list(void);
86
87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static 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)
102static 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
114static 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
124static __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
136int 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
146void ext4_superblock_csum_set(struct super_block *sb)
147{
148 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
149
150 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
151 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
152 return;
153
154 es->s_checksum = ext4_superblock_csum(sb, es);
155}
156
157void *ext4_kvmalloc(size_t size, gfp_t flags)
158{
159 void *ret;
160
161 ret = kmalloc(size, flags);
162 if (!ret)
163 ret = __vmalloc(size, flags, PAGE_KERNEL);
164 return ret;
165}
166
167void *ext4_kvzalloc(size_t size, gfp_t flags)
168{
169 void *ret;
170
171 ret = kzalloc(size, flags);
172 if (!ret)
173 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
174 return ret;
175}
176
177void ext4_kvfree(void *ptr)
178{
179 if (is_vmalloc_addr(ptr))
180 vfree(ptr);
181 else
182 kfree(ptr);
183
184}
185
186ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
187 struct ext4_group_desc *bg)
188{
189 return le32_to_cpu(bg->bg_block_bitmap_lo) |
190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
191 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
192}
193
194ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
195 struct ext4_group_desc *bg)
196{
197 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
199 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
200}
201
202ext4_fsblk_t ext4_inode_table(struct super_block *sb,
203 struct ext4_group_desc *bg)
204{
205 return le32_to_cpu(bg->bg_inode_table_lo) |
206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
207 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
208}
209
210__u32 ext4_free_group_clusters(struct super_block *sb,
211 struct ext4_group_desc *bg)
212{
213 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
215 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
216}
217
218__u32 ext4_free_inodes_count(struct super_block *sb,
219 struct ext4_group_desc *bg)
220{
221 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
223 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
224}
225
226__u32 ext4_used_dirs_count(struct super_block *sb,
227 struct ext4_group_desc *bg)
228{
229 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
231 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
232}
233
234__u32 ext4_itable_unused_count(struct super_block *sb,
235 struct ext4_group_desc *bg)
236{
237 return le16_to_cpu(bg->bg_itable_unused_lo) |
238 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
239 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
240}
241
242void ext4_block_bitmap_set(struct super_block *sb,
243 struct ext4_group_desc *bg, ext4_fsblk_t blk)
244{
245 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
248}
249
250void ext4_inode_bitmap_set(struct super_block *sb,
251 struct ext4_group_desc *bg, ext4_fsblk_t blk)
252{
253 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
256}
257
258void ext4_inode_table_set(struct super_block *sb,
259 struct ext4_group_desc *bg, ext4_fsblk_t blk)
260{
261 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
264}
265
266void ext4_free_group_clusters_set(struct super_block *sb,
267 struct ext4_group_desc *bg, __u32 count)
268{
269 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
272}
273
274void ext4_free_inodes_set(struct super_block *sb,
275 struct ext4_group_desc *bg, __u32 count)
276{
277 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
280}
281
282void ext4_used_dirs_set(struct super_block *sb,
283 struct ext4_group_desc *bg, __u32 count)
284{
285 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
288}
289
290void ext4_itable_unused_set(struct super_block *sb,
291 struct ext4_group_desc *bg, __u32 count)
292{
293 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
294 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
295 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
296}
297
298
299
300static handle_t *ext4_get_nojournal(void)
301{
302 handle_t *handle = current->journal_info;
303 unsigned long ref_cnt = (unsigned long)handle;
304
305 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
306
307 ref_cnt++;
308 handle = (handle_t *)ref_cnt;
309
310 current->journal_info = handle;
311 return handle;
312}
313
314
315
316static void ext4_put_nojournal(handle_t *handle)
317{
318 unsigned long ref_cnt = (unsigned long)handle;
319
320 BUG_ON(ref_cnt == 0);
321
322 ref_cnt--;
323 handle = (handle_t *)ref_cnt;
324
325 current->journal_info = handle;
326}
327
328
329
330
331handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
332{
333 journal_t *journal;
334
335 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
336 if (sb->s_flags & MS_RDONLY)
337 return ERR_PTR(-EROFS);
338
339 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
340 journal = EXT4_SB(sb)->s_journal;
341 if (!journal)
342 return ext4_get_nojournal();
343
344
345
346
347
348 if (is_journal_aborted(journal)) {
349 ext4_abort(sb, "Detected aborted journal");
350 return ERR_PTR(-EROFS);
351 }
352 return jbd2_journal_start(journal, nblocks);
353}
354
355int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
356{
357 struct super_block *sb;
358 int err;
359 int rc;
360
361 if (!ext4_handle_valid(handle)) {
362 ext4_put_nojournal(handle);
363 return 0;
364 }
365 sb = handle->h_transaction->t_journal->j_private;
366 err = handle->h_err;
367 rc = jbd2_journal_stop(handle);
368
369 if (!err)
370 err = rc;
371 if (err)
372 __ext4_std_error(sb, where, line, err);
373 return err;
374}
375
376void ext4_journal_abort_handle(const char *caller, unsigned int line,
377 const char *err_fn, struct buffer_head *bh,
378 handle_t *handle, int err)
379{
380 char nbuf[16];
381 const char *errstr = ext4_decode_error(NULL, err, nbuf);
382
383 BUG_ON(!ext4_handle_valid(handle));
384
385 if (bh)
386 BUFFER_TRACE(bh, "abort");
387
388 if (!handle->h_err)
389 handle->h_err = err;
390
391 if (is_handle_aborted(handle))
392 return;
393
394 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
395 caller, line, errstr, err_fn);
396
397 jbd2_journal_abort_handle(handle);
398}
399
400static void __save_error_info(struct super_block *sb, const char *func,
401 unsigned int line)
402{
403 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
404
405 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
406 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
407 es->s_last_error_time = cpu_to_le32(get_seconds());
408 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
409 es->s_last_error_line = cpu_to_le32(line);
410 if (!es->s_first_error_time) {
411 es->s_first_error_time = es->s_last_error_time;
412 strncpy(es->s_first_error_func, func,
413 sizeof(es->s_first_error_func));
414 es->s_first_error_line = cpu_to_le32(line);
415 es->s_first_error_ino = es->s_last_error_ino;
416 es->s_first_error_block = es->s_last_error_block;
417 }
418
419
420
421
422 if (!es->s_error_count)
423 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
424 le32_add_cpu(&es->s_error_count, 1);
425}
426
427static void save_error_info(struct super_block *sb, const char *func,
428 unsigned int line)
429{
430 __save_error_info(sb, func, line);
431 ext4_commit_super(sb, 1);
432}
433
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441
442static int block_device_ejected(struct super_block *sb)
443{
444 struct inode *bd_inode = sb->s_bdev->bd_inode;
445 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
446
447 return bdi->dev == NULL;
448}
449
450static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
451{
452 struct super_block *sb = journal->j_private;
453 struct ext4_sb_info *sbi = EXT4_SB(sb);
454 int error = is_journal_aborted(journal);
455 struct ext4_journal_cb_entry *jce, *tmp;
456
457 spin_lock(&sbi->s_md_lock);
458 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
459 list_del_init(&jce->jce_list);
460 spin_unlock(&sbi->s_md_lock);
461 jce->jce_func(sb, jce, error);
462 spin_lock(&sbi->s_md_lock);
463 }
464 spin_unlock(&sbi->s_md_lock);
465}
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481
482static void ext4_handle_error(struct super_block *sb)
483{
484 if (sb->s_flags & MS_RDONLY)
485 return;
486
487 if (!test_opt(sb, ERRORS_CONT)) {
488 journal_t *journal = EXT4_SB(sb)->s_journal;
489
490 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
491 if (journal)
492 jbd2_journal_abort(journal, -EIO);
493 }
494 if (test_opt(sb, ERRORS_RO)) {
495 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
496 sb->s_flags |= MS_RDONLY;
497 }
498 if (test_opt(sb, ERRORS_PANIC))
499 panic("EXT4-fs (device %s): panic forced after error\n",
500 sb->s_id);
501}
502
503void __ext4_error(struct super_block *sb, const char *function,
504 unsigned int line, const char *fmt, ...)
505{
506 struct va_format vaf;
507 va_list args;
508
509 va_start(args, fmt);
510 vaf.fmt = fmt;
511 vaf.va = &args;
512 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
513 sb->s_id, function, line, current->comm, &vaf);
514 va_end(args);
515 save_error_info(sb, function, line);
516
517 ext4_handle_error(sb);
518}
519
520void ext4_error_inode(struct inode *inode, const char *function,
521 unsigned int line, ext4_fsblk_t block,
522 const char *fmt, ...)
523{
524 va_list args;
525 struct va_format vaf;
526 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
527
528 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
529 es->s_last_error_block = cpu_to_le64(block);
530 save_error_info(inode->i_sb, function, line);
531 va_start(args, fmt);
532 vaf.fmt = fmt;
533 vaf.va = &args;
534 if (block)
535 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
536 "inode #%lu: block %llu: comm %s: %pV\n",
537 inode->i_sb->s_id, function, line, inode->i_ino,
538 block, current->comm, &vaf);
539 else
540 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
541 "inode #%lu: comm %s: %pV\n",
542 inode->i_sb->s_id, function, line, inode->i_ino,
543 current->comm, &vaf);
544 va_end(args);
545
546 ext4_handle_error(inode->i_sb);
547}
548
549void ext4_error_file(struct file *file, const char *function,
550 unsigned int line, ext4_fsblk_t block,
551 const char *fmt, ...)
552{
553 va_list args;
554 struct va_format vaf;
555 struct ext4_super_block *es;
556 struct inode *inode = file->f_dentry->d_inode;
557 char pathname[80], *path;
558
559 es = EXT4_SB(inode->i_sb)->s_es;
560 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
561 save_error_info(inode->i_sb, function, line);
562 path = d_path(&(file->f_path), pathname, sizeof(pathname));
563 if (IS_ERR(path))
564 path = "(unknown)";
565 va_start(args, fmt);
566 vaf.fmt = fmt;
567 vaf.va = &args;
568 if (block)
569 printk(KERN_CRIT
570 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
571 "block %llu: comm %s: path %s: %pV\n",
572 inode->i_sb->s_id, function, line, inode->i_ino,
573 block, current->comm, path, &vaf);
574 else
575 printk(KERN_CRIT
576 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
577 "comm %s: path %s: %pV\n",
578 inode->i_sb->s_id, function, line, inode->i_ino,
579 current->comm, path, &vaf);
580 va_end(args);
581
582 ext4_handle_error(inode->i_sb);
583}
584
585static const char *ext4_decode_error(struct super_block *sb, int errno,
586 char nbuf[16])
587{
588 char *errstr = NULL;
589
590 switch (errno) {
591 case -EIO:
592 errstr = "IO failure";
593 break;
594 case -ENOMEM:
595 errstr = "Out of memory";
596 break;
597 case -EROFS:
598 if (!sb || (EXT4_SB(sb)->s_journal &&
599 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
600 errstr = "Journal has aborted";
601 else
602 errstr = "Readonly filesystem";
603 break;
604 default:
605
606
607
608 if (nbuf) {
609
610 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
611 errstr = nbuf;
612 }
613 break;
614 }
615
616 return errstr;
617}
618
619
620
621
622void __ext4_std_error(struct super_block *sb, const char *function,
623 unsigned int line, int errno)
624{
625 char nbuf[16];
626 const char *errstr;
627
628
629
630
631 if (errno == -EROFS && journal_current_handle() == NULL &&
632 (sb->s_flags & MS_RDONLY))
633 return;
634
635 errstr = ext4_decode_error(sb, errno, nbuf);
636 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
637 sb->s_id, function, line, errstr);
638 save_error_info(sb, function, line);
639
640 ext4_handle_error(sb);
641}
642
643
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651
652
653void __ext4_abort(struct super_block *sb, const char *function,
654 unsigned int line, const char *fmt, ...)
655{
656 va_list args;
657
658 save_error_info(sb, function, line);
659 va_start(args, fmt);
660 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
661 function, line);
662 vprintk(fmt, args);
663 printk("\n");
664 va_end(args);
665
666 if ((sb->s_flags & MS_RDONLY) == 0) {
667 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
668 sb->s_flags |= MS_RDONLY;
669 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
670 if (EXT4_SB(sb)->s_journal)
671 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
672 save_error_info(sb, function, line);
673 }
674 if (test_opt(sb, ERRORS_PANIC))
675 panic("EXT4-fs panic from previous error\n");
676}
677
678void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
679{
680 struct va_format vaf;
681 va_list args;
682
683 va_start(args, fmt);
684 vaf.fmt = fmt;
685 vaf.va = &args;
686 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
687 va_end(args);
688}
689
690void __ext4_warning(struct super_block *sb, const char *function,
691 unsigned int line, const char *fmt, ...)
692{
693 struct va_format vaf;
694 va_list args;
695
696 va_start(args, fmt);
697 vaf.fmt = fmt;
698 vaf.va = &args;
699 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
700 sb->s_id, function, line, &vaf);
701 va_end(args);
702}
703
704void __ext4_grp_locked_error(const char *function, unsigned int line,
705 struct super_block *sb, ext4_group_t grp,
706 unsigned long ino, ext4_fsblk_t block,
707 const char *fmt, ...)
708__releases(bitlock)
709__acquires(bitlock)
710{
711 struct va_format vaf;
712 va_list args;
713 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
714
715 es->s_last_error_ino = cpu_to_le32(ino);
716 es->s_last_error_block = cpu_to_le64(block);
717 __save_error_info(sb, function, line);
718
719 va_start(args, fmt);
720
721 vaf.fmt = fmt;
722 vaf.va = &args;
723 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
724 sb->s_id, function, line, grp);
725 if (ino)
726 printk(KERN_CONT "inode %lu: ", ino);
727 if (block)
728 printk(KERN_CONT "block %llu:", (unsigned long long) block);
729 printk(KERN_CONT "%pV\n", &vaf);
730 va_end(args);
731
732 if (test_opt(sb, ERRORS_CONT)) {
733 ext4_commit_super(sb, 0);
734 return;
735 }
736
737 ext4_unlock_group(sb, grp);
738 ext4_handle_error(sb);
739
740
741
742
743
744
745
746
747
748
749
750 ext4_lock_group(sb, grp);
751 return;
752}
753
754void ext4_update_dynamic_rev(struct super_block *sb)
755{
756 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
757
758 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
759 return;
760
761 ext4_warning(sb,
762 "updating to rev %d because of new feature flag, "
763 "running e2fsck is recommended",
764 EXT4_DYNAMIC_REV);
765
766 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
767 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
768 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
769
770
771
772
773
774
775
776
777}
778
779
780
781
782static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
783{
784 struct block_device *bdev;
785 char b[BDEVNAME_SIZE];
786
787 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
788 if (IS_ERR(bdev))
789 goto fail;
790 return bdev;
791
792fail:
793 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
794 __bdevname(dev, b), PTR_ERR(bdev));
795 return NULL;
796}
797
798
799
800
801static int ext4_blkdev_put(struct block_device *bdev)
802{
803 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
804}
805
806static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
807{
808 struct block_device *bdev;
809 int ret = -ENODEV;
810
811 bdev = sbi->journal_bdev;
812 if (bdev) {
813 ret = ext4_blkdev_put(bdev);
814 sbi->journal_bdev = NULL;
815 }
816 return ret;
817}
818
819static inline struct inode *orphan_list_entry(struct list_head *l)
820{
821 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
822}
823
824static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
825{
826 struct list_head *l;
827
828 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
829 le32_to_cpu(sbi->s_es->s_last_orphan));
830
831 printk(KERN_ERR "sb_info orphan list:\n");
832 list_for_each(l, &sbi->s_orphan) {
833 struct inode *inode = orphan_list_entry(l);
834 printk(KERN_ERR " "
835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
836 inode->i_sb->s_id, inode->i_ino, inode,
837 inode->i_mode, inode->i_nlink,
838 NEXT_ORPHAN(inode));
839 }
840}
841
842static void ext4_put_super(struct super_block *sb)
843{
844 struct ext4_sb_info *sbi = EXT4_SB(sb);
845 struct ext4_super_block *es = sbi->s_es;
846 int i, err;
847
848 ext4_unregister_li_request(sb);
849 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
850
851 flush_workqueue(sbi->dio_unwritten_wq);
852 destroy_workqueue(sbi->dio_unwritten_wq);
853
854 if (sbi->s_journal) {
855 err = jbd2_journal_destroy(sbi->s_journal);
856 sbi->s_journal = NULL;
857 if (err < 0)
858 ext4_abort(sb, "Couldn't clean up the journal");
859 }
860
861 del_timer(&sbi->s_err_report);
862 ext4_release_system_zone(sb);
863 ext4_mb_release(sb);
864 ext4_ext_release(sb);
865 ext4_xattr_put_super(sb);
866
867 if (!(sb->s_flags & MS_RDONLY)) {
868 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
869 es->s_state = cpu_to_le16(sbi->s_mount_state);
870 }
871 if (!(sb->s_flags & MS_RDONLY))
872 ext4_commit_super(sb, 1);
873
874 if (sbi->s_proc) {
875 remove_proc_entry("options", sbi->s_proc);
876 remove_proc_entry(sb->s_id, ext4_proc_root);
877 }
878 kobject_del(&sbi->s_kobj);
879
880 for (i = 0; i < sbi->s_gdb_count; i++)
881 brelse(sbi->s_group_desc[i]);
882 ext4_kvfree(sbi->s_group_desc);
883 ext4_kvfree(sbi->s_flex_groups);
884 percpu_counter_destroy(&sbi->s_freeclusters_counter);
885 percpu_counter_destroy(&sbi->s_freeinodes_counter);
886 percpu_counter_destroy(&sbi->s_dirs_counter);
887 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
888 brelse(sbi->s_sbh);
889#ifdef CONFIG_QUOTA
890 for (i = 0; i < MAXQUOTAS; i++)
891 kfree(sbi->s_qf_names[i]);
892#endif
893
894
895
896
897
898 if (!list_empty(&sbi->s_orphan))
899 dump_orphan_list(sb, sbi);
900 J_ASSERT(list_empty(&sbi->s_orphan));
901
902 invalidate_bdev(sb->s_bdev);
903 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
904
905
906
907
908
909 sync_blockdev(sbi->journal_bdev);
910 invalidate_bdev(sbi->journal_bdev);
911 ext4_blkdev_remove(sbi);
912 }
913 if (sbi->s_mmp_tsk)
914 kthread_stop(sbi->s_mmp_tsk);
915 sb->s_fs_info = NULL;
916
917
918
919
920 kobject_put(&sbi->s_kobj);
921 wait_for_completion(&sbi->s_kobj_unregister);
922 if (sbi->s_chksum_driver)
923 crypto_free_shash(sbi->s_chksum_driver);
924 kfree(sbi->s_blockgroup_lock);
925 kfree(sbi);
926}
927
928static struct kmem_cache *ext4_inode_cachep;
929
930
931
932
933static struct inode *ext4_alloc_inode(struct super_block *sb)
934{
935 struct ext4_inode_info *ei;
936
937 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
938 if (!ei)
939 return NULL;
940
941 ei->vfs_inode.i_version = 1;
942 ei->vfs_inode.i_data.writeback_index = 0;
943 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
944 INIT_LIST_HEAD(&ei->i_prealloc_list);
945 spin_lock_init(&ei->i_prealloc_lock);
946 ei->i_reserved_data_blocks = 0;
947 ei->i_reserved_meta_blocks = 0;
948 ei->i_allocated_meta_blocks = 0;
949 ei->i_da_metadata_calc_len = 0;
950 ei->i_da_metadata_calc_last_lblock = 0;
951 spin_lock_init(&(ei->i_block_reservation_lock));
952#ifdef CONFIG_QUOTA
953 ei->i_reserved_quota = 0;
954#endif
955 ei->jinode = NULL;
956 INIT_LIST_HEAD(&ei->i_completed_io_list);
957 spin_lock_init(&ei->i_completed_io_lock);
958 ei->i_sync_tid = 0;
959 ei->i_datasync_tid = 0;
960 atomic_set(&ei->i_ioend_count, 0);
961 atomic_set(&ei->i_unwritten, 0);
962
963 return &ei->vfs_inode;
964}
965
966static int ext4_drop_inode(struct inode *inode)
967{
968 int drop = generic_drop_inode(inode);
969
970 trace_ext4_drop_inode(inode, drop);
971 return drop;
972}
973
974static void ext4_i_callback(struct rcu_head *head)
975{
976 struct inode *inode = container_of(head, struct inode, i_rcu);
977 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
978}
979
980static void ext4_destroy_inode(struct inode *inode)
981{
982 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
983 ext4_msg(inode->i_sb, KERN_ERR,
984 "Inode %lu (%p): orphan list check failed!",
985 inode->i_ino, EXT4_I(inode));
986 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
987 EXT4_I(inode), sizeof(struct ext4_inode_info),
988 true);
989 dump_stack();
990 }
991 call_rcu(&inode->i_rcu, ext4_i_callback);
992}
993
994static void init_once(void *foo)
995{
996 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
997
998 INIT_LIST_HEAD(&ei->i_orphan);
999#ifdef CONFIG_EXT4_FS_XATTR
1000 init_rwsem(&ei->xattr_sem);
1001#endif
1002 init_rwsem(&ei->i_data_sem);
1003 inode_init_once(&ei->vfs_inode);
1004}
1005
1006static int init_inodecache(void)
1007{
1008 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1009 sizeof(struct ext4_inode_info),
1010 0, (SLAB_RECLAIM_ACCOUNT|
1011 SLAB_MEM_SPREAD),
1012 init_once);
1013 if (ext4_inode_cachep == NULL)
1014 return -ENOMEM;
1015 return 0;
1016}
1017
1018static void destroy_inodecache(void)
1019{
1020
1021
1022
1023
1024 rcu_barrier();
1025 kmem_cache_destroy(ext4_inode_cachep);
1026}
1027
1028void ext4_clear_inode(struct inode *inode)
1029{
1030 invalidate_inode_buffers(inode);
1031 clear_inode(inode);
1032 dquot_drop(inode);
1033 ext4_discard_preallocations(inode);
1034 if (EXT4_I(inode)->jinode) {
1035 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1036 EXT4_I(inode)->jinode);
1037 jbd2_free_inode(EXT4_I(inode)->jinode);
1038 EXT4_I(inode)->jinode = NULL;
1039 }
1040}
1041
1042static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1043 u64 ino, u32 generation)
1044{
1045 struct inode *inode;
1046
1047 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1048 return ERR_PTR(-ESTALE);
1049 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1050 return ERR_PTR(-ESTALE);
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060 inode = ext4_iget(sb, ino);
1061 if (IS_ERR(inode))
1062 return ERR_CAST(inode);
1063 if (generation && inode->i_generation != generation) {
1064 iput(inode);
1065 return ERR_PTR(-ESTALE);
1066 }
1067
1068 return inode;
1069}
1070
1071static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1072 int fh_len, int fh_type)
1073{
1074 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1075 ext4_nfs_get_inode);
1076}
1077
1078static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1079 int fh_len, int fh_type)
1080{
1081 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1082 ext4_nfs_get_inode);
1083}
1084
1085
1086
1087
1088
1089
1090
1091static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1092 gfp_t wait)
1093{
1094 journal_t *journal = EXT4_SB(sb)->s_journal;
1095
1096 WARN_ON(PageChecked(page));
1097 if (!page_has_buffers(page))
1098 return 0;
1099 if (journal)
1100 return jbd2_journal_try_to_free_buffers(journal, page,
1101 wait & ~__GFP_WAIT);
1102 return try_to_free_buffers(page);
1103}
1104
1105#ifdef CONFIG_QUOTA
1106#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1107#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1108
1109static int ext4_write_dquot(struct dquot *dquot);
1110static int ext4_acquire_dquot(struct dquot *dquot);
1111static int ext4_release_dquot(struct dquot *dquot);
1112static int ext4_mark_dquot_dirty(struct dquot *dquot);
1113static int ext4_write_info(struct super_block *sb, int type);
1114static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1115 struct path *path);
1116static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1117 int format_id);
1118static int ext4_quota_off(struct super_block *sb, int type);
1119static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1120static int ext4_quota_on_mount(struct super_block *sb, int type);
1121static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1122 size_t len, loff_t off);
1123static ssize_t ext4_quota_write(struct super_block *sb, int type,
1124 const char *data, size_t len, loff_t off);
1125static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1126 unsigned int flags);
1127static int ext4_enable_quotas(struct super_block *sb);
1128
1129static const struct dquot_operations ext4_quota_operations = {
1130 .get_reserved_space = ext4_get_reserved_space,
1131 .write_dquot = ext4_write_dquot,
1132 .acquire_dquot = ext4_acquire_dquot,
1133 .release_dquot = ext4_release_dquot,
1134 .mark_dirty = ext4_mark_dquot_dirty,
1135 .write_info = ext4_write_info,
1136 .alloc_dquot = dquot_alloc,
1137 .destroy_dquot = dquot_destroy,
1138};
1139
1140static const struct quotactl_ops ext4_qctl_operations = {
1141 .quota_on = ext4_quota_on,
1142 .quota_off = ext4_quota_off,
1143 .quota_sync = dquot_quota_sync,
1144 .get_info = dquot_get_dqinfo,
1145 .set_info = dquot_set_dqinfo,
1146 .get_dqblk = dquot_get_dqblk,
1147 .set_dqblk = dquot_set_dqblk
1148};
1149
1150static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1151 .quota_on_meta = ext4_quota_on_sysfile,
1152 .quota_off = ext4_quota_off_sysfile,
1153 .quota_sync = dquot_quota_sync,
1154 .get_info = dquot_get_dqinfo,
1155 .set_info = dquot_set_dqinfo,
1156 .get_dqblk = dquot_get_dqblk,
1157 .set_dqblk = dquot_set_dqblk
1158};
1159#endif
1160
1161static const struct super_operations ext4_sops = {
1162 .alloc_inode = ext4_alloc_inode,
1163 .destroy_inode = ext4_destroy_inode,
1164 .write_inode = ext4_write_inode,
1165 .dirty_inode = ext4_dirty_inode,
1166 .drop_inode = ext4_drop_inode,
1167 .evict_inode = ext4_evict_inode,
1168 .put_super = ext4_put_super,
1169 .sync_fs = ext4_sync_fs,
1170 .freeze_fs = ext4_freeze,
1171 .unfreeze_fs = ext4_unfreeze,
1172 .statfs = ext4_statfs,
1173 .remount_fs = ext4_remount,
1174 .show_options = ext4_show_options,
1175#ifdef CONFIG_QUOTA
1176 .quota_read = ext4_quota_read,
1177 .quota_write = ext4_quota_write,
1178#endif
1179 .bdev_try_to_free_page = bdev_try_to_free_page,
1180};
1181
1182static const struct super_operations ext4_nojournal_sops = {
1183 .alloc_inode = ext4_alloc_inode,
1184 .destroy_inode = ext4_destroy_inode,
1185 .write_inode = ext4_write_inode,
1186 .dirty_inode = ext4_dirty_inode,
1187 .drop_inode = ext4_drop_inode,
1188 .evict_inode = ext4_evict_inode,
1189 .put_super = ext4_put_super,
1190 .statfs = ext4_statfs,
1191 .remount_fs = ext4_remount,
1192 .show_options = ext4_show_options,
1193#ifdef CONFIG_QUOTA
1194 .quota_read = ext4_quota_read,
1195 .quota_write = ext4_quota_write,
1196#endif
1197 .bdev_try_to_free_page = bdev_try_to_free_page,
1198};
1199
1200static const struct export_operations ext4_export_ops = {
1201 .fh_to_dentry = ext4_fh_to_dentry,
1202 .fh_to_parent = ext4_fh_to_parent,
1203 .get_parent = ext4_get_parent,
1204};
1205
1206enum {
1207 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1208 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1209 Opt_nouid32, Opt_debug, Opt_removed,
1210 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1211 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1212 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1213 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1214 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1215 Opt_data_err_abort, Opt_data_err_ignore,
1216 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1217 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1218 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1219 Opt_usrquota, Opt_grpquota, Opt_i_version,
1220 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1221 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1222 Opt_inode_readahead_blks, Opt_journal_ioprio,
1223 Opt_dioread_nolock, Opt_dioread_lock,
1224 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1225 Opt_max_dir_size_kb,
1226};
1227
1228static const match_table_t tokens = {
1229 {Opt_bsd_df, "bsddf"},
1230 {Opt_minix_df, "minixdf"},
1231 {Opt_grpid, "grpid"},
1232 {Opt_grpid, "bsdgroups"},
1233 {Opt_nogrpid, "nogrpid"},
1234 {Opt_nogrpid, "sysvgroups"},
1235 {Opt_resgid, "resgid=%u"},
1236 {Opt_resuid, "resuid=%u"},
1237 {Opt_sb, "sb=%u"},
1238 {Opt_err_cont, "errors=continue"},
1239 {Opt_err_panic, "errors=panic"},
1240 {Opt_err_ro, "errors=remount-ro"},
1241 {Opt_nouid32, "nouid32"},
1242 {Opt_debug, "debug"},
1243 {Opt_removed, "oldalloc"},
1244 {Opt_removed, "orlov"},
1245 {Opt_user_xattr, "user_xattr"},
1246 {Opt_nouser_xattr, "nouser_xattr"},
1247 {Opt_acl, "acl"},
1248 {Opt_noacl, "noacl"},
1249 {Opt_noload, "norecovery"},
1250 {Opt_noload, "noload"},
1251 {Opt_removed, "nobh"},
1252 {Opt_removed, "bh"},
1253 {Opt_commit, "commit=%u"},
1254 {Opt_min_batch_time, "min_batch_time=%u"},
1255 {Opt_max_batch_time, "max_batch_time=%u"},
1256 {Opt_journal_dev, "journal_dev=%u"},
1257 {Opt_journal_checksum, "journal_checksum"},
1258 {Opt_journal_async_commit, "journal_async_commit"},
1259 {Opt_abort, "abort"},
1260 {Opt_data_journal, "data=journal"},
1261 {Opt_data_ordered, "data=ordered"},
1262 {Opt_data_writeback, "data=writeback"},
1263 {Opt_data_err_abort, "data_err=abort"},
1264 {Opt_data_err_ignore, "data_err=ignore"},
1265 {Opt_offusrjquota, "usrjquota="},
1266 {Opt_usrjquota, "usrjquota=%s"},
1267 {Opt_offgrpjquota, "grpjquota="},
1268 {Opt_grpjquota, "grpjquota=%s"},
1269 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1270 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1271 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1272 {Opt_grpquota, "grpquota"},
1273 {Opt_noquota, "noquota"},
1274 {Opt_quota, "quota"},
1275 {Opt_usrquota, "usrquota"},
1276 {Opt_barrier, "barrier=%u"},
1277 {Opt_barrier, "barrier"},
1278 {Opt_nobarrier, "nobarrier"},
1279 {Opt_i_version, "i_version"},
1280 {Opt_stripe, "stripe=%u"},
1281 {Opt_delalloc, "delalloc"},
1282 {Opt_nodelalloc, "nodelalloc"},
1283 {Opt_mblk_io_submit, "mblk_io_submit"},
1284 {Opt_nomblk_io_submit, "nomblk_io_submit"},
1285 {Opt_block_validity, "block_validity"},
1286 {Opt_noblock_validity, "noblock_validity"},
1287 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1288 {Opt_journal_ioprio, "journal_ioprio=%u"},
1289 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1290 {Opt_auto_da_alloc, "auto_da_alloc"},
1291 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1292 {Opt_dioread_nolock, "dioread_nolock"},
1293 {Opt_dioread_lock, "dioread_lock"},
1294 {Opt_discard, "discard"},
1295 {Opt_nodiscard, "nodiscard"},
1296 {Opt_init_itable, "init_itable=%u"},
1297 {Opt_init_itable, "init_itable"},
1298 {Opt_noinit_itable, "noinit_itable"},
1299 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1300 {Opt_removed, "check=none"},
1301 {Opt_removed, "nocheck"},
1302 {Opt_removed, "reservation"},
1303 {Opt_removed, "noreservation"},
1304 {Opt_removed, "journal=%u"},
1305 {Opt_err, NULL},
1306};
1307
1308static ext4_fsblk_t get_sb_block(void **data)
1309{
1310 ext4_fsblk_t sb_block;
1311 char *options = (char *) *data;
1312
1313 if (!options || strncmp(options, "sb=", 3) != 0)
1314 return 1;
1315
1316 options += 3;
1317
1318 sb_block = simple_strtoul(options, &options, 0);
1319 if (*options && *options != ',') {
1320 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1321 (char *) *data);
1322 return 1;
1323 }
1324 if (*options == ',')
1325 options++;
1326 *data = (void *) options;
1327
1328 return sb_block;
1329}
1330
1331#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1332static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1333 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1334
1335#ifdef CONFIG_QUOTA
1336static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1337{
1338 struct ext4_sb_info *sbi = EXT4_SB(sb);
1339 char *qname;
1340
1341 if (sb_any_quota_loaded(sb) &&
1342 !sbi->s_qf_names[qtype]) {
1343 ext4_msg(sb, KERN_ERR,
1344 "Cannot change journaled "
1345 "quota options when quota turned on");
1346 return -1;
1347 }
1348 qname = match_strdup(args);
1349 if (!qname) {
1350 ext4_msg(sb, KERN_ERR,
1351 "Not enough memory for storing quotafile name");
1352 return -1;
1353 }
1354 if (sbi->s_qf_names[qtype] &&
1355 strcmp(sbi->s_qf_names[qtype], qname)) {
1356 ext4_msg(sb, KERN_ERR,
1357 "%s quota file already specified", QTYPE2NAME(qtype));
1358 kfree(qname);
1359 return -1;
1360 }
1361 sbi->s_qf_names[qtype] = qname;
1362 if (strchr(sbi->s_qf_names[qtype], '/')) {
1363 ext4_msg(sb, KERN_ERR,
1364 "quotafile must be on filesystem root");
1365 kfree(sbi->s_qf_names[qtype]);
1366 sbi->s_qf_names[qtype] = NULL;
1367 return -1;
1368 }
1369 set_opt(sb, QUOTA);
1370 return 1;
1371}
1372
1373static int clear_qf_name(struct super_block *sb, int qtype)
1374{
1375
1376 struct ext4_sb_info *sbi = EXT4_SB(sb);
1377
1378 if (sb_any_quota_loaded(sb) &&
1379 sbi->s_qf_names[qtype]) {
1380 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1381 " when quota turned on");
1382 return -1;
1383 }
1384
1385
1386
1387
1388 sbi->s_qf_names[qtype] = NULL;
1389 return 1;
1390}
1391#endif
1392
1393#define MOPT_SET 0x0001
1394#define MOPT_CLEAR 0x0002
1395#define MOPT_NOSUPPORT 0x0004
1396#define MOPT_EXPLICIT 0x0008
1397#define MOPT_CLEAR_ERR 0x0010
1398#define MOPT_GTE0 0x0020
1399#ifdef CONFIG_QUOTA
1400#define MOPT_Q 0
1401#define MOPT_QFMT 0x0040
1402#else
1403#define MOPT_Q MOPT_NOSUPPORT
1404#define MOPT_QFMT MOPT_NOSUPPORT
1405#endif
1406#define MOPT_DATAJ 0x0080
1407
1408static const struct mount_opts {
1409 int token;
1410 int mount_opt;
1411 int flags;
1412} ext4_mount_opts[] = {
1413 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1414 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1415 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1416 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1417 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1418 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1419 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1420 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1421 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1422 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1423 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1424 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1425 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1426 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1427 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1428 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1429 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1430 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1431 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1432 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1433 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1434 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1435 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1436 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1437 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1438 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1439 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1440 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1441 {Opt_commit, 0, MOPT_GTE0},
1442 {Opt_max_batch_time, 0, MOPT_GTE0},
1443 {Opt_min_batch_time, 0, MOPT_GTE0},
1444 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1445 {Opt_init_itable, 0, MOPT_GTE0},
1446 {Opt_stripe, 0, MOPT_GTE0},
1447 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1448 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1449 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
1450#ifdef CONFIG_EXT4_FS_XATTR
1451 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1452 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1453#else
1454 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1455 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
1456#endif
1457#ifdef CONFIG_EXT4_FS_POSIX_ACL
1458 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1459 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1460#else
1461 {Opt_acl, 0, MOPT_NOSUPPORT},
1462 {Opt_noacl, 0, MOPT_NOSUPPORT},
1463#endif
1464 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1465 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1466 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1467 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1468 MOPT_SET | MOPT_Q},
1469 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1470 MOPT_SET | MOPT_Q},
1471 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1472 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1473 {Opt_usrjquota, 0, MOPT_Q},
1474 {Opt_grpjquota, 0, MOPT_Q},
1475 {Opt_offusrjquota, 0, MOPT_Q},
1476 {Opt_offgrpjquota, 0, MOPT_Q},
1477 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1478 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1479 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1480 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1481 {Opt_err, 0, 0}
1482};
1483
1484static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1485 substring_t *args, unsigned long *journal_devnum,
1486 unsigned int *journal_ioprio, int is_remount)
1487{
1488 struct ext4_sb_info *sbi = EXT4_SB(sb);
1489 const struct mount_opts *m;
1490 kuid_t uid;
1491 kgid_t gid;
1492 int arg = 0;
1493
1494#ifdef CONFIG_QUOTA
1495 if (token == Opt_usrjquota)
1496 return set_qf_name(sb, USRQUOTA, &args[0]);
1497 else if (token == Opt_grpjquota)
1498 return set_qf_name(sb, GRPQUOTA, &args[0]);
1499 else if (token == Opt_offusrjquota)
1500 return clear_qf_name(sb, USRQUOTA);
1501 else if (token == Opt_offgrpjquota)
1502 return clear_qf_name(sb, GRPQUOTA);
1503#endif
1504 if (args->from && match_int(args, &arg))
1505 return -1;
1506 switch (token) {
1507 case Opt_noacl:
1508 case Opt_nouser_xattr:
1509 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1510 break;
1511 case Opt_sb:
1512 return 1;
1513 case Opt_removed:
1514 ext4_msg(sb, KERN_WARNING,
1515 "Ignoring removed %s option", opt);
1516 return 1;
1517 case Opt_resuid:
1518 uid = make_kuid(current_user_ns(), arg);
1519 if (!uid_valid(uid)) {
1520 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1521 return -1;
1522 }
1523 sbi->s_resuid = uid;
1524 return 1;
1525 case Opt_resgid:
1526 gid = make_kgid(current_user_ns(), arg);
1527 if (!gid_valid(gid)) {
1528 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1529 return -1;
1530 }
1531 sbi->s_resgid = gid;
1532 return 1;
1533 case Opt_abort:
1534 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1535 return 1;
1536 case Opt_i_version:
1537 sb->s_flags |= MS_I_VERSION;
1538 return 1;
1539 case Opt_journal_dev:
1540 if (is_remount) {
1541 ext4_msg(sb, KERN_ERR,
1542 "Cannot specify journal on remount");
1543 return -1;
1544 }
1545 *journal_devnum = arg;
1546 return 1;
1547 case Opt_journal_ioprio:
1548 if (arg < 0 || arg > 7)
1549 return -1;
1550 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1551 return 1;
1552 }
1553
1554 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1555 if (token != m->token)
1556 continue;
1557 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1558 return -1;
1559 if (m->flags & MOPT_EXPLICIT)
1560 set_opt2(sb, EXPLICIT_DELALLOC);
1561 if (m->flags & MOPT_CLEAR_ERR)
1562 clear_opt(sb, ERRORS_MASK);
1563 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1564 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1565 "options when quota turned on");
1566 return -1;
1567 }
1568
1569 if (m->flags & MOPT_NOSUPPORT) {
1570 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1571 } else if (token == Opt_commit) {
1572 if (arg == 0)
1573 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1574 sbi->s_commit_interval = HZ * arg;
1575 } else if (token == Opt_max_batch_time) {
1576 if (arg == 0)
1577 arg = EXT4_DEF_MAX_BATCH_TIME;
1578 sbi->s_max_batch_time = arg;
1579 } else if (token == Opt_min_batch_time) {
1580 sbi->s_min_batch_time = arg;
1581 } else if (token == Opt_inode_readahead_blks) {
1582 if (arg > (1 << 30))
1583 return -1;
1584 if (arg && !is_power_of_2(arg)) {
1585 ext4_msg(sb, KERN_ERR,
1586 "EXT4-fs: inode_readahead_blks"
1587 " must be a power of 2");
1588 return -1;
1589 }
1590 sbi->s_inode_readahead_blks = arg;
1591 } else if (token == Opt_init_itable) {
1592 set_opt(sb, INIT_INODE_TABLE);
1593 if (!args->from)
1594 arg = EXT4_DEF_LI_WAIT_MULT;
1595 sbi->s_li_wait_mult = arg;
1596 } else if (token == Opt_max_dir_size_kb) {
1597 sbi->s_max_dir_size_kb = arg;
1598 } else if (token == Opt_stripe) {
1599 sbi->s_stripe = arg;
1600 } else if (m->flags & MOPT_DATAJ) {
1601 if (is_remount) {
1602 if (!sbi->s_journal)
1603 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1604 else if (test_opt(sb, DATA_FLAGS) !=
1605 m->mount_opt) {
1606 ext4_msg(sb, KERN_ERR,
1607 "Cannot change data mode on remount");
1608 return -1;
1609 }
1610 } else {
1611 clear_opt(sb, DATA_FLAGS);
1612 sbi->s_mount_opt |= m->mount_opt;
1613 }
1614#ifdef CONFIG_QUOTA
1615 } else if (m->flags & MOPT_QFMT) {
1616 if (sb_any_quota_loaded(sb) &&
1617 sbi->s_jquota_fmt != m->mount_opt) {
1618 ext4_msg(sb, KERN_ERR, "Cannot "
1619 "change journaled quota options "
1620 "when quota turned on");
1621 return -1;
1622 }
1623 sbi->s_jquota_fmt = m->mount_opt;
1624#endif
1625 } else {
1626 if (!args->from)
1627 arg = 1;
1628 if (m->flags & MOPT_CLEAR)
1629 arg = !arg;
1630 else if (unlikely(!(m->flags & MOPT_SET))) {
1631 ext4_msg(sb, KERN_WARNING,
1632 "buggy handling of option %s", opt);
1633 WARN_ON(1);
1634 return -1;
1635 }
1636 if (arg != 0)
1637 sbi->s_mount_opt |= m->mount_opt;
1638 else
1639 sbi->s_mount_opt &= ~m->mount_opt;
1640 }
1641 return 1;
1642 }
1643 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1644 "or missing value", opt);
1645 return -1;
1646}
1647
1648static int parse_options(char *options, struct super_block *sb,
1649 unsigned long *journal_devnum,
1650 unsigned int *journal_ioprio,
1651 int is_remount)
1652{
1653 struct ext4_sb_info *sbi = EXT4_SB(sb);
1654 char *p;
1655 substring_t args[MAX_OPT_ARGS];
1656 int token;
1657
1658 if (!options)
1659 return 1;
1660
1661 while ((p = strsep(&options, ",")) != NULL) {
1662 if (!*p)
1663 continue;
1664
1665
1666
1667
1668 args[0].to = args[0].from = NULL;
1669 token = match_token(p, tokens, args);
1670 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1671 journal_ioprio, is_remount) < 0)
1672 return 0;
1673 }
1674#ifdef CONFIG_QUOTA
1675 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1676 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1677 clear_opt(sb, USRQUOTA);
1678
1679 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1680 clear_opt(sb, GRPQUOTA);
1681
1682 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1683 ext4_msg(sb, KERN_ERR, "old and new quota "
1684 "format mixing");
1685 return 0;
1686 }
1687
1688 if (!sbi->s_jquota_fmt) {
1689 ext4_msg(sb, KERN_ERR, "journaled quota format "
1690 "not specified");
1691 return 0;
1692 }
1693 } else {
1694 if (sbi->s_jquota_fmt) {
1695 ext4_msg(sb, KERN_ERR, "journaled quota format "
1696 "specified with no journaling "
1697 "enabled");
1698 return 0;
1699 }
1700 }
1701#endif
1702 if (test_opt(sb, DIOREAD_NOLOCK)) {
1703 int blocksize =
1704 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1705
1706 if (blocksize < PAGE_CACHE_SIZE) {
1707 ext4_msg(sb, KERN_ERR, "can't mount with "
1708 "dioread_nolock if block size != PAGE_SIZE");
1709 return 0;
1710 }
1711 }
1712 return 1;
1713}
1714
1715static inline void ext4_show_quota_options(struct seq_file *seq,
1716 struct super_block *sb)
1717{
1718#if defined(CONFIG_QUOTA)
1719 struct ext4_sb_info *sbi = EXT4_SB(sb);
1720
1721 if (sbi->s_jquota_fmt) {
1722 char *fmtname = "";
1723
1724 switch (sbi->s_jquota_fmt) {
1725 case QFMT_VFS_OLD:
1726 fmtname = "vfsold";
1727 break;
1728 case QFMT_VFS_V0:
1729 fmtname = "vfsv0";
1730 break;
1731 case QFMT_VFS_V1:
1732 fmtname = "vfsv1";
1733 break;
1734 }
1735 seq_printf(seq, ",jqfmt=%s", fmtname);
1736 }
1737
1738 if (sbi->s_qf_names[USRQUOTA])
1739 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1740
1741 if (sbi->s_qf_names[GRPQUOTA])
1742 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1743
1744 if (test_opt(sb, USRQUOTA))
1745 seq_puts(seq, ",usrquota");
1746
1747 if (test_opt(sb, GRPQUOTA))
1748 seq_puts(seq, ",grpquota");
1749#endif
1750}
1751
1752static const char *token2str(int token)
1753{
1754 const struct match_token *t;
1755
1756 for (t = tokens; t->token != Opt_err; t++)
1757 if (t->token == token && !strchr(t->pattern, '='))
1758 break;
1759 return t->pattern;
1760}
1761
1762
1763
1764
1765
1766
1767static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1768 int nodefs)
1769{
1770 struct ext4_sb_info *sbi = EXT4_SB(sb);
1771 struct ext4_super_block *es = sbi->s_es;
1772 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1773 const struct mount_opts *m;
1774 char sep = nodefs ? '\n' : ',';
1775
1776#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1777#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1778
1779 if (sbi->s_sb_block != 1)
1780 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1781
1782 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1783 int want_set = m->flags & MOPT_SET;
1784 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1785 (m->flags & MOPT_CLEAR_ERR))
1786 continue;
1787 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1788 continue;
1789 if ((want_set &&
1790 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1791 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1792 continue;
1793 SEQ_OPTS_PRINT("%s", token2str(m->token));
1794 }
1795
1796 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1797 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1798 SEQ_OPTS_PRINT("resuid=%u",
1799 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1800 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1801 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1802 SEQ_OPTS_PRINT("resgid=%u",
1803 from_kgid_munged(&init_user_ns, sbi->s_resgid));
1804 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1805 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1806 SEQ_OPTS_PUTS("errors=remount-ro");
1807 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1808 SEQ_OPTS_PUTS("errors=continue");
1809 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1810 SEQ_OPTS_PUTS("errors=panic");
1811 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1812 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1813 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1814 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1815 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1816 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1817 if (sb->s_flags & MS_I_VERSION)
1818 SEQ_OPTS_PUTS("i_version");
1819 if (nodefs || sbi->s_stripe)
1820 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1821 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1822 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1823 SEQ_OPTS_PUTS("data=journal");
1824 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1825 SEQ_OPTS_PUTS("data=ordered");
1826 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1827 SEQ_OPTS_PUTS("data=writeback");
1828 }
1829 if (nodefs ||
1830 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1831 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1832 sbi->s_inode_readahead_blks);
1833
1834 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1835 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1836 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1837 if (nodefs || sbi->s_max_dir_size_kb)
1838 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1839
1840 ext4_show_quota_options(seq, sb);
1841 return 0;
1842}
1843
1844static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1845{
1846 return _ext4_show_options(seq, root->d_sb, 0);
1847}
1848
1849static int options_seq_show(struct seq_file *seq, void *offset)
1850{
1851 struct super_block *sb = seq->private;
1852 int rc;
1853
1854 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1855 rc = _ext4_show_options(seq, sb, 1);
1856 seq_puts(seq, "\n");
1857 return rc;
1858}
1859
1860static int options_open_fs(struct inode *inode, struct file *file)
1861{
1862 return single_open(file, options_seq_show, PDE(inode)->data);
1863}
1864
1865static const struct file_operations ext4_seq_options_fops = {
1866 .owner = THIS_MODULE,
1867 .open = options_open_fs,
1868 .read = seq_read,
1869 .llseek = seq_lseek,
1870 .release = single_release,
1871};
1872
1873static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1874 int read_only)
1875{
1876 struct ext4_sb_info *sbi = EXT4_SB(sb);
1877 int res = 0;
1878
1879 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1880 ext4_msg(sb, KERN_ERR, "revision level too high, "
1881 "forcing read-only mode");
1882 res = MS_RDONLY;
1883 }
1884 if (read_only)
1885 goto done;
1886 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1887 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1888 "running e2fsck is recommended");
1889 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1890 ext4_msg(sb, KERN_WARNING,
1891 "warning: mounting fs with errors, "
1892 "running e2fsck is recommended");
1893 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1894 le16_to_cpu(es->s_mnt_count) >=
1895 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1896 ext4_msg(sb, KERN_WARNING,
1897 "warning: maximal mount count reached, "
1898 "running e2fsck is recommended");
1899 else if (le32_to_cpu(es->s_checkinterval) &&
1900 (le32_to_cpu(es->s_lastcheck) +
1901 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1902 ext4_msg(sb, KERN_WARNING,
1903 "warning: checktime reached, "
1904 "running e2fsck is recommended");
1905 if (!sbi->s_journal)
1906 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1907 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1908 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1909 le16_add_cpu(&es->s_mnt_count, 1);
1910 es->s_mtime = cpu_to_le32(get_seconds());
1911 ext4_update_dynamic_rev(sb);
1912 if (sbi->s_journal)
1913 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1914
1915 ext4_commit_super(sb, 1);
1916done:
1917 if (test_opt(sb, DEBUG))
1918 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1919 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1920 sb->s_blocksize,
1921 sbi->s_groups_count,
1922 EXT4_BLOCKS_PER_GROUP(sb),
1923 EXT4_INODES_PER_GROUP(sb),
1924 sbi->s_mount_opt, sbi->s_mount_opt2);
1925
1926 cleancache_init_fs(sb);
1927 return res;
1928}
1929
1930int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1931{
1932 struct ext4_sb_info *sbi = EXT4_SB(sb);
1933 struct flex_groups *new_groups;
1934 int size;
1935
1936 if (!sbi->s_log_groups_per_flex)
1937 return 0;
1938
1939 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1940 if (size <= sbi->s_flex_groups_allocated)
1941 return 0;
1942
1943 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1944 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1945 if (!new_groups) {
1946 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1947 size / (int) sizeof(struct flex_groups));
1948 return -ENOMEM;
1949 }
1950
1951 if (sbi->s_flex_groups) {
1952 memcpy(new_groups, sbi->s_flex_groups,
1953 (sbi->s_flex_groups_allocated *
1954 sizeof(struct flex_groups)));
1955 ext4_kvfree(sbi->s_flex_groups);
1956 }
1957 sbi->s_flex_groups = new_groups;
1958 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1959 return 0;
1960}
1961
1962static int ext4_fill_flex_info(struct super_block *sb)
1963{
1964 struct ext4_sb_info *sbi = EXT4_SB(sb);
1965 struct ext4_group_desc *gdp = NULL;
1966 ext4_group_t flex_group;
1967 unsigned int groups_per_flex = 0;
1968 int i, err;
1969
1970 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1971 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1972 sbi->s_log_groups_per_flex = 0;
1973 return 1;
1974 }
1975 groups_per_flex = 1U << sbi->s_log_groups_per_flex;
1976
1977 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1978 if (err)
1979 goto failed;
1980
1981 for (i = 0; i < sbi->s_groups_count; i++) {
1982 gdp = ext4_get_group_desc(sb, i, NULL);
1983
1984 flex_group = ext4_flex_group(sbi, i);
1985 atomic_add(ext4_free_inodes_count(sb, gdp),
1986 &sbi->s_flex_groups[flex_group].free_inodes);
1987 atomic_add(ext4_free_group_clusters(sb, gdp),
1988 &sbi->s_flex_groups[flex_group].free_clusters);
1989 atomic_add(ext4_used_dirs_count(sb, gdp),
1990 &sbi->s_flex_groups[flex_group].used_dirs);
1991 }
1992
1993 return 1;
1994failed:
1995 return 0;
1996}
1997
1998static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1999 struct ext4_group_desc *gdp)
2000{
2001 int offset;
2002 __u16 crc = 0;
2003 __le32 le_group = cpu_to_le32(block_group);
2004
2005 if ((sbi->s_es->s_feature_ro_compat &
2006 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2007
2008 __u16 old_csum;
2009 __u32 csum32;
2010
2011 old_csum = gdp->bg_checksum;
2012 gdp->bg_checksum = 0;
2013 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2014 sizeof(le_group));
2015 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2016 sbi->s_desc_size);
2017 gdp->bg_checksum = old_csum;
2018
2019 crc = csum32 & 0xFFFF;
2020 goto out;
2021 }
2022
2023
2024 offset = offsetof(struct ext4_group_desc, bg_checksum);
2025
2026 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2027 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2028 crc = crc16(crc, (__u8 *)gdp, offset);
2029 offset += sizeof(gdp->bg_checksum);
2030
2031 if ((sbi->s_es->s_feature_incompat &
2032 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2033 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2034 crc = crc16(crc, (__u8 *)gdp + offset,
2035 le16_to_cpu(sbi->s_es->s_desc_size) -
2036 offset);
2037
2038out:
2039 return cpu_to_le16(crc);
2040}
2041
2042int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2043 struct ext4_group_desc *gdp)
2044{
2045 if (ext4_has_group_desc_csum(sb) &&
2046 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2047 block_group, gdp)))
2048 return 0;
2049
2050 return 1;
2051}
2052
2053void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2054 struct ext4_group_desc *gdp)
2055{
2056 if (!ext4_has_group_desc_csum(sb))
2057 return;
2058 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2059}
2060
2061
2062static int ext4_check_descriptors(struct super_block *sb,
2063 ext4_group_t *first_not_zeroed)
2064{
2065 struct ext4_sb_info *sbi = EXT4_SB(sb);
2066 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2067 ext4_fsblk_t last_block;
2068 ext4_fsblk_t block_bitmap;
2069 ext4_fsblk_t inode_bitmap;
2070 ext4_fsblk_t inode_table;
2071 int flexbg_flag = 0;
2072 ext4_group_t i, grp = sbi->s_groups_count;
2073
2074 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2075 flexbg_flag = 1;
2076
2077 ext4_debug("Checking group descriptors");
2078
2079 for (i = 0; i < sbi->s_groups_count; i++) {
2080 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2081
2082 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2083 last_block = ext4_blocks_count(sbi->s_es) - 1;
2084 else
2085 last_block = first_block +
2086 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2087
2088 if ((grp == sbi->s_groups_count) &&
2089 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2090 grp = i;
2091
2092 block_bitmap = ext4_block_bitmap(sb, gdp);
2093 if (block_bitmap < first_block || block_bitmap > last_block) {
2094 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2095 "Block bitmap for group %u not in group "
2096 "(block %llu)!", i, block_bitmap);
2097 return 0;
2098 }
2099 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2100 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2101 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2102 "Inode bitmap for group %u not in group "
2103 "(block %llu)!", i, inode_bitmap);
2104 return 0;
2105 }
2106 inode_table = ext4_inode_table(sb, gdp);
2107 if (inode_table < first_block ||
2108 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2109 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2110 "Inode table for group %u not in group "
2111 "(block %llu)!", i, inode_table);
2112 return 0;
2113 }
2114 ext4_lock_group(sb, i);
2115 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2116 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2117 "Checksum for group %u failed (%u!=%u)",
2118 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2119 gdp)), le16_to_cpu(gdp->bg_checksum));
2120 if (!(sb->s_flags & MS_RDONLY)) {
2121 ext4_unlock_group(sb, i);
2122 return 0;
2123 }
2124 }
2125 ext4_unlock_group(sb, i);
2126 if (!flexbg_flag)
2127 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2128 }
2129 if (NULL != first_not_zeroed)
2130 *first_not_zeroed = grp;
2131
2132 ext4_free_blocks_count_set(sbi->s_es,
2133 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2134 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2135 return 1;
2136}
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155static void ext4_orphan_cleanup(struct super_block *sb,
2156 struct ext4_super_block *es)
2157{
2158 unsigned int s_flags = sb->s_flags;
2159 int nr_orphans = 0, nr_truncates = 0;
2160#ifdef CONFIG_QUOTA
2161 int i;
2162#endif
2163 if (!es->s_last_orphan) {
2164 jbd_debug(4, "no orphan inodes to clean up\n");
2165 return;
2166 }
2167
2168 if (bdev_read_only(sb->s_bdev)) {
2169 ext4_msg(sb, KERN_ERR, "write access "
2170 "unavailable, skipping orphan cleanup");
2171 return;
2172 }
2173
2174
2175 if (!ext4_feature_set_ok(sb, 0)) {
2176 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2177 "unknown ROCOMPAT features");
2178 return;
2179 }
2180
2181 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2182
2183 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2184 jbd_debug(1, "Errors on filesystem, "
2185 "clearing orphan list.\n");
2186 es->s_last_orphan = 0;
2187 }
2188 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2189 return;
2190 }
2191
2192 if (s_flags & MS_RDONLY) {
2193 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2194 sb->s_flags &= ~MS_RDONLY;
2195 }
2196#ifdef CONFIG_QUOTA
2197
2198 sb->s_flags |= MS_ACTIVE;
2199
2200 for (i = 0; i < MAXQUOTAS; i++) {
2201 if (EXT4_SB(sb)->s_qf_names[i]) {
2202 int ret = ext4_quota_on_mount(sb, i);
2203 if (ret < 0)
2204 ext4_msg(sb, KERN_ERR,
2205 "Cannot turn on journaled "
2206 "quota: error %d", ret);
2207 }
2208 }
2209#endif
2210
2211 while (es->s_last_orphan) {
2212 struct inode *inode;
2213
2214 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2215 if (IS_ERR(inode)) {
2216 es->s_last_orphan = 0;
2217 break;
2218 }
2219
2220 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2221 dquot_initialize(inode);
2222 if (inode->i_nlink) {
2223 ext4_msg(sb, KERN_DEBUG,
2224 "%s: truncating inode %lu to %lld bytes",
2225 __func__, inode->i_ino, inode->i_size);
2226 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2227 inode->i_ino, inode->i_size);
2228 mutex_lock(&inode->i_mutex);
2229 ext4_truncate(inode);
2230 mutex_unlock(&inode->i_mutex);
2231 nr_truncates++;
2232 } else {
2233 ext4_msg(sb, KERN_DEBUG,
2234 "%s: deleting unreferenced inode %lu",
2235 __func__, inode->i_ino);
2236 jbd_debug(2, "deleting unreferenced inode %lu\n",
2237 inode->i_ino);
2238 nr_orphans++;
2239 }
2240 iput(inode);
2241 }
2242
2243#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2244
2245 if (nr_orphans)
2246 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2247 PLURAL(nr_orphans));
2248 if (nr_truncates)
2249 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2250 PLURAL(nr_truncates));
2251#ifdef CONFIG_QUOTA
2252
2253 for (i = 0; i < MAXQUOTAS; i++) {
2254 if (sb_dqopt(sb)->files[i])
2255 dquot_quota_off(sb, i);
2256 }
2257#endif
2258 sb->s_flags = s_flags;
2259}
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276static loff_t ext4_max_size(int blkbits, int has_huge_files)
2277{
2278 loff_t res;
2279 loff_t upper_limit = MAX_LFS_FILESIZE;
2280
2281
2282 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2283
2284
2285
2286
2287
2288 upper_limit = (1LL << 32) - 1;
2289
2290
2291 upper_limit >>= (blkbits - 9);
2292 upper_limit <<= blkbits;
2293 }
2294
2295
2296
2297
2298
2299
2300 res = (1LL << 32) - 1;
2301 res <<= blkbits;
2302
2303
2304 if (res > upper_limit)
2305 res = upper_limit;
2306
2307 return res;
2308}
2309
2310
2311
2312
2313
2314
2315static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2316{
2317 loff_t res = EXT4_NDIR_BLOCKS;
2318 int meta_blocks;
2319 loff_t upper_limit;
2320
2321
2322
2323
2324
2325
2326
2327
2328 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2329
2330
2331
2332
2333
2334 upper_limit = (1LL << 32) - 1;
2335
2336
2337 upper_limit >>= (bits - 9);
2338
2339 } else {
2340
2341
2342
2343
2344
2345
2346 upper_limit = (1LL << 48) - 1;
2347
2348 }
2349
2350
2351 meta_blocks = 1;
2352
2353 meta_blocks += 1 + (1LL << (bits-2));
2354
2355 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2356
2357 upper_limit -= meta_blocks;
2358 upper_limit <<= bits;
2359
2360 res += 1LL << (bits-2);
2361 res += 1LL << (2*(bits-2));
2362 res += 1LL << (3*(bits-2));
2363 res <<= bits;
2364 if (res > upper_limit)
2365 res = upper_limit;
2366
2367 if (res > MAX_LFS_FILESIZE)
2368 res = MAX_LFS_FILESIZE;
2369
2370 return res;
2371}
2372
2373static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2374 ext4_fsblk_t logical_sb_block, int nr)
2375{
2376 struct ext4_sb_info *sbi = EXT4_SB(sb);
2377 ext4_group_t bg, first_meta_bg;
2378 int has_super = 0;
2379
2380 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2381
2382 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2383 nr < first_meta_bg)
2384 return logical_sb_block + nr + 1;
2385 bg = sbi->s_desc_per_block * nr;
2386 if (ext4_bg_has_super(sb, bg))
2387 has_super = 1;
2388
2389 return (has_super + ext4_group_first_block_no(sb, bg));
2390}
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2404{
2405 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2406 unsigned long stripe_width =
2407 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2408 int ret;
2409
2410 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2411 ret = sbi->s_stripe;
2412 else if (stripe_width <= sbi->s_blocks_per_group)
2413 ret = stripe_width;
2414 else if (stride <= sbi->s_blocks_per_group)
2415 ret = stride;
2416 else
2417 ret = 0;
2418
2419
2420
2421
2422
2423 if (ret <= 1)
2424 ret = 0;
2425
2426 return ret;
2427}
2428
2429
2430
2431struct ext4_attr {
2432 struct attribute attr;
2433 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2434 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2435 const char *, size_t);
2436 int offset;
2437};
2438
2439static int parse_strtoul(const char *buf,
2440 unsigned long max, unsigned long *value)
2441{
2442 char *endp;
2443
2444 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2445 endp = skip_spaces(endp);
2446 if (*endp || *value > max)
2447 return -EINVAL;
2448
2449 return 0;
2450}
2451
2452static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2453 struct ext4_sb_info *sbi,
2454 char *buf)
2455{
2456 return snprintf(buf, PAGE_SIZE, "%llu\n",
2457 (s64) EXT4_C2B(sbi,
2458 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2459}
2460
2461static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2462 struct ext4_sb_info *sbi, char *buf)
2463{
2464 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2465
2466 if (!sb->s_bdev->bd_part)
2467 return snprintf(buf, PAGE_SIZE, "0\n");
2468 return snprintf(buf, PAGE_SIZE, "%lu\n",
2469 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2470 sbi->s_sectors_written_start) >> 1);
2471}
2472
2473static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2474 struct ext4_sb_info *sbi, char *buf)
2475{
2476 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2477
2478 if (!sb->s_bdev->bd_part)
2479 return snprintf(buf, PAGE_SIZE, "0\n");
2480 return snprintf(buf, PAGE_SIZE, "%llu\n",
2481 (unsigned long long)(sbi->s_kbytes_written +
2482 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2483 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2484}
2485
2486static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2487 struct ext4_sb_info *sbi,
2488 const char *buf, size_t count)
2489{
2490 unsigned long t;
2491
2492 if (parse_strtoul(buf, 0x40000000, &t))
2493 return -EINVAL;
2494
2495 if (t && !is_power_of_2(t))
2496 return -EINVAL;
2497
2498 sbi->s_inode_readahead_blks = t;
2499 return count;
2500}
2501
2502static ssize_t sbi_ui_show(struct ext4_attr *a,
2503 struct ext4_sb_info *sbi, char *buf)
2504{
2505 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2506
2507 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2508}
2509
2510static ssize_t sbi_ui_store(struct ext4_attr *a,
2511 struct ext4_sb_info *sbi,
2512 const char *buf, size_t count)
2513{
2514 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2515 unsigned long t;
2516
2517 if (parse_strtoul(buf, 0xffffffff, &t))
2518 return -EINVAL;
2519 *ui = t;
2520 return count;
2521}
2522
2523static ssize_t trigger_test_error(struct ext4_attr *a,
2524 struct ext4_sb_info *sbi,
2525 const char *buf, size_t count)
2526{
2527 int len = count;
2528
2529 if (!capable(CAP_SYS_ADMIN))
2530 return -EPERM;
2531
2532 if (len && buf[len-1] == '\n')
2533 len--;
2534
2535 if (len)
2536 ext4_error(sbi->s_sb, "%.*s", len, buf);
2537 return count;
2538}
2539
2540#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2541static struct ext4_attr ext4_attr_##_name = { \
2542 .attr = {.name = __stringify(_name), .mode = _mode }, \
2543 .show = _show, \
2544 .store = _store, \
2545 .offset = offsetof(struct ext4_sb_info, _elname), \
2546}
2547#define EXT4_ATTR(name, mode, show, store) \
2548static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2549
2550#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2551#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2552#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2553#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2554 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2555#define ATTR_LIST(name) &ext4_attr_##name.attr
2556
2557EXT4_RO_ATTR(delayed_allocation_blocks);
2558EXT4_RO_ATTR(session_write_kbytes);
2559EXT4_RO_ATTR(lifetime_write_kbytes);
2560EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2561 inode_readahead_blks_store, s_inode_readahead_blks);
2562EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2563EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2564EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2565EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2566EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2567EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2568EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2569EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2570EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2571EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2572
2573static struct attribute *ext4_attrs[] = {
2574 ATTR_LIST(delayed_allocation_blocks),
2575 ATTR_LIST(session_write_kbytes),
2576 ATTR_LIST(lifetime_write_kbytes),
2577 ATTR_LIST(inode_readahead_blks),
2578 ATTR_LIST(inode_goal),
2579 ATTR_LIST(mb_stats),
2580 ATTR_LIST(mb_max_to_scan),
2581 ATTR_LIST(mb_min_to_scan),
2582 ATTR_LIST(mb_order2_req),
2583 ATTR_LIST(mb_stream_req),
2584 ATTR_LIST(mb_group_prealloc),
2585 ATTR_LIST(max_writeback_mb_bump),
2586 ATTR_LIST(extent_max_zeroout_kb),
2587 ATTR_LIST(trigger_fs_error),
2588 NULL,
2589};
2590
2591
2592EXT4_INFO_ATTR(lazy_itable_init);
2593EXT4_INFO_ATTR(batched_discard);
2594EXT4_INFO_ATTR(meta_bg_resize);
2595
2596static struct attribute *ext4_feat_attrs[] = {
2597 ATTR_LIST(lazy_itable_init),
2598 ATTR_LIST(batched_discard),
2599 ATTR_LIST(meta_bg_resize),
2600 NULL,
2601};
2602
2603static ssize_t ext4_attr_show(struct kobject *kobj,
2604 struct attribute *attr, char *buf)
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->show ? a->show(a, sbi, buf) : 0;
2611}
2612
2613static ssize_t ext4_attr_store(struct kobject *kobj,
2614 struct attribute *attr,
2615 const char *buf, size_t len)
2616{
2617 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2618 s_kobj);
2619 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2620
2621 return a->store ? a->store(a, sbi, buf, len) : 0;
2622}
2623
2624static void ext4_sb_release(struct kobject *kobj)
2625{
2626 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2627 s_kobj);
2628 complete(&sbi->s_kobj_unregister);
2629}
2630
2631static const struct sysfs_ops ext4_attr_ops = {
2632 .show = ext4_attr_show,
2633 .store = ext4_attr_store,
2634};
2635
2636static struct kobj_type ext4_ktype = {
2637 .default_attrs = ext4_attrs,
2638 .sysfs_ops = &ext4_attr_ops,
2639 .release = ext4_sb_release,
2640};
2641
2642static void ext4_feat_release(struct kobject *kobj)
2643{
2644 complete(&ext4_feat->f_kobj_unregister);
2645}
2646
2647static struct kobj_type ext4_feat_ktype = {
2648 .default_attrs = ext4_feat_attrs,
2649 .sysfs_ops = &ext4_attr_ops,
2650 .release = ext4_feat_release,
2651};
2652
2653
2654
2655
2656
2657
2658
2659static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2660{
2661 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2662 ext4_msg(sb, KERN_ERR,
2663 "Couldn't mount because of "
2664 "unsupported optional features (%x)",
2665 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2666 ~EXT4_FEATURE_INCOMPAT_SUPP));
2667 return 0;
2668 }
2669
2670 if (readonly)
2671 return 1;
2672
2673
2674 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2675 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2676 "unsupported optional features (%x)",
2677 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2678 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2679 return 0;
2680 }
2681
2682
2683
2684
2685 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2686 if (sizeof(blkcnt_t) < sizeof(u64)) {
2687 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2688 "cannot be mounted RDWR without "
2689 "CONFIG_LBDAF");
2690 return 0;
2691 }
2692 }
2693 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2694 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2695 ext4_msg(sb, KERN_ERR,
2696 "Can't support bigalloc feature without "
2697 "extents feature\n");
2698 return 0;
2699 }
2700
2701#ifndef CONFIG_QUOTA
2702 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2703 !readonly) {
2704 ext4_msg(sb, KERN_ERR,
2705 "Filesystem with quota feature cannot be mounted RDWR "
2706 "without CONFIG_QUOTA");
2707 return 0;
2708 }
2709#endif
2710 return 1;
2711}
2712
2713
2714
2715
2716
2717static void print_daily_error_info(unsigned long arg)
2718{
2719 struct super_block *sb = (struct super_block *) arg;
2720 struct ext4_sb_info *sbi;
2721 struct ext4_super_block *es;
2722
2723 sbi = EXT4_SB(sb);
2724 es = sbi->s_es;
2725
2726 if (es->s_error_count)
2727 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2728 le32_to_cpu(es->s_error_count));
2729 if (es->s_first_error_time) {
2730 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2731 sb->s_id, le32_to_cpu(es->s_first_error_time),
2732 (int) sizeof(es->s_first_error_func),
2733 es->s_first_error_func,
2734 le32_to_cpu(es->s_first_error_line));
2735 if (es->s_first_error_ino)
2736 printk(": inode %u",
2737 le32_to_cpu(es->s_first_error_ino));
2738 if (es->s_first_error_block)
2739 printk(": block %llu", (unsigned long long)
2740 le64_to_cpu(es->s_first_error_block));
2741 printk("\n");
2742 }
2743 if (es->s_last_error_time) {
2744 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2745 sb->s_id, le32_to_cpu(es->s_last_error_time),
2746 (int) sizeof(es->s_last_error_func),
2747 es->s_last_error_func,
2748 le32_to_cpu(es->s_last_error_line));
2749 if (es->s_last_error_ino)
2750 printk(": inode %u",
2751 le32_to_cpu(es->s_last_error_ino));
2752 if (es->s_last_error_block)
2753 printk(": block %llu", (unsigned long long)
2754 le64_to_cpu(es->s_last_error_block));
2755 printk("\n");
2756 }
2757 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
2758}
2759
2760
2761static int ext4_run_li_request(struct ext4_li_request *elr)
2762{
2763 struct ext4_group_desc *gdp = NULL;
2764 ext4_group_t group, ngroups;
2765 struct super_block *sb;
2766 unsigned long timeout = 0;
2767 int ret = 0;
2768
2769 sb = elr->lr_super;
2770 ngroups = EXT4_SB(sb)->s_groups_count;
2771
2772 sb_start_write(sb);
2773 for (group = elr->lr_next_group; group < ngroups; group++) {
2774 gdp = ext4_get_group_desc(sb, group, NULL);
2775 if (!gdp) {
2776 ret = 1;
2777 break;
2778 }
2779
2780 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2781 break;
2782 }
2783
2784 if (group == ngroups)
2785 ret = 1;
2786
2787 if (!ret) {
2788 timeout = jiffies;
2789 ret = ext4_init_inode_table(sb, group,
2790 elr->lr_timeout ? 0 : 1);
2791 if (elr->lr_timeout == 0) {
2792 timeout = (jiffies - timeout) *
2793 elr->lr_sbi->s_li_wait_mult;
2794 elr->lr_timeout = timeout;
2795 }
2796 elr->lr_next_sched = jiffies + elr->lr_timeout;
2797 elr->lr_next_group = group + 1;
2798 }
2799 sb_end_write(sb);
2800
2801 return ret;
2802}
2803
2804
2805
2806
2807
2808static void ext4_remove_li_request(struct ext4_li_request *elr)
2809{
2810 struct ext4_sb_info *sbi;
2811
2812 if (!elr)
2813 return;
2814
2815 sbi = elr->lr_sbi;
2816
2817 list_del(&elr->lr_request);
2818 sbi->s_li_request = NULL;
2819 kfree(elr);
2820}
2821
2822static void ext4_unregister_li_request(struct super_block *sb)
2823{
2824 mutex_lock(&ext4_li_mtx);
2825 if (!ext4_li_info) {
2826 mutex_unlock(&ext4_li_mtx);
2827 return;
2828 }
2829
2830 mutex_lock(&ext4_li_info->li_list_mtx);
2831 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2832 mutex_unlock(&ext4_li_info->li_list_mtx);
2833 mutex_unlock(&ext4_li_mtx);
2834}
2835
2836static struct task_struct *ext4_lazyinit_task;
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847static int ext4_lazyinit_thread(void *arg)
2848{
2849 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2850 struct list_head *pos, *n;
2851 struct ext4_li_request *elr;
2852 unsigned long next_wakeup, cur;
2853
2854 BUG_ON(NULL == eli);
2855
2856cont_thread:
2857 while (true) {
2858 next_wakeup = MAX_JIFFY_OFFSET;
2859
2860 mutex_lock(&eli->li_list_mtx);
2861 if (list_empty(&eli->li_request_list)) {
2862 mutex_unlock(&eli->li_list_mtx);
2863 goto exit_thread;
2864 }
2865
2866 list_for_each_safe(pos, n, &eli->li_request_list) {
2867 elr = list_entry(pos, struct ext4_li_request,
2868 lr_request);
2869
2870 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2871 if (ext4_run_li_request(elr) != 0) {
2872
2873 ext4_remove_li_request(elr);
2874 continue;
2875 }
2876 }
2877
2878 if (time_before(elr->lr_next_sched, next_wakeup))
2879 next_wakeup = elr->lr_next_sched;
2880 }
2881 mutex_unlock(&eli->li_list_mtx);
2882
2883 try_to_freeze();
2884
2885 cur = jiffies;
2886 if ((time_after_eq(cur, next_wakeup)) ||
2887 (MAX_JIFFY_OFFSET == next_wakeup)) {
2888 cond_resched();
2889 continue;
2890 }
2891
2892 schedule_timeout_interruptible(next_wakeup - cur);
2893
2894 if (kthread_should_stop()) {
2895 ext4_clear_request_list();
2896 goto exit_thread;
2897 }
2898 }
2899
2900exit_thread:
2901
2902
2903
2904
2905
2906
2907
2908
2909 mutex_lock(&ext4_li_mtx);
2910 mutex_lock(&eli->li_list_mtx);
2911 if (!list_empty(&eli->li_request_list)) {
2912 mutex_unlock(&eli->li_list_mtx);
2913 mutex_unlock(&ext4_li_mtx);
2914 goto cont_thread;
2915 }
2916 mutex_unlock(&eli->li_list_mtx);
2917 kfree(ext4_li_info);
2918 ext4_li_info = NULL;
2919 mutex_unlock(&ext4_li_mtx);
2920
2921 return 0;
2922}
2923
2924static void ext4_clear_request_list(void)
2925{
2926 struct list_head *pos, *n;
2927 struct ext4_li_request *elr;
2928
2929 mutex_lock(&ext4_li_info->li_list_mtx);
2930 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2931 elr = list_entry(pos, struct ext4_li_request,
2932 lr_request);
2933 ext4_remove_li_request(elr);
2934 }
2935 mutex_unlock(&ext4_li_info->li_list_mtx);
2936}
2937
2938static int ext4_run_lazyinit_thread(void)
2939{
2940 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2941 ext4_li_info, "ext4lazyinit");
2942 if (IS_ERR(ext4_lazyinit_task)) {
2943 int err = PTR_ERR(ext4_lazyinit_task);
2944 ext4_clear_request_list();
2945 kfree(ext4_li_info);
2946 ext4_li_info = NULL;
2947 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2948 "initialization thread\n",
2949 err);
2950 return err;
2951 }
2952 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2953 return 0;
2954}
2955
2956
2957
2958
2959
2960
2961
2962static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2963{
2964 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2965 struct ext4_group_desc *gdp = NULL;
2966
2967 for (group = 0; group < ngroups; group++) {
2968 gdp = ext4_get_group_desc(sb, group, NULL);
2969 if (!gdp)
2970 continue;
2971
2972 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2973 break;
2974 }
2975
2976 return group;
2977}
2978
2979static int ext4_li_info_new(void)
2980{
2981 struct ext4_lazy_init *eli = NULL;
2982
2983 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2984 if (!eli)
2985 return -ENOMEM;
2986
2987 INIT_LIST_HEAD(&eli->li_request_list);
2988 mutex_init(&eli->li_list_mtx);
2989
2990 eli->li_state |= EXT4_LAZYINIT_QUIT;
2991
2992 ext4_li_info = eli;
2993
2994 return 0;
2995}
2996
2997static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2998 ext4_group_t start)
2999{
3000 struct ext4_sb_info *sbi = EXT4_SB(sb);
3001 struct ext4_li_request *elr;
3002 unsigned long rnd;
3003
3004 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3005 if (!elr)
3006 return NULL;
3007
3008 elr->lr_super = sb;
3009 elr->lr_sbi = sbi;
3010 elr->lr_next_group = start;
3011
3012
3013
3014
3015
3016
3017 get_random_bytes(&rnd, sizeof(rnd));
3018 elr->lr_next_sched = jiffies + (unsigned long)rnd %
3019 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3020
3021 return elr;
3022}
3023
3024static int ext4_register_li_request(struct super_block *sb,
3025 ext4_group_t first_not_zeroed)
3026{
3027 struct ext4_sb_info *sbi = EXT4_SB(sb);
3028 struct ext4_li_request *elr;
3029 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3030 int ret = 0;
3031
3032 if (sbi->s_li_request != NULL) {
3033
3034
3035
3036
3037 sbi->s_li_request->lr_timeout = 0;
3038 return 0;
3039 }
3040
3041 if (first_not_zeroed == ngroups ||
3042 (sb->s_flags & MS_RDONLY) ||
3043 !test_opt(sb, INIT_INODE_TABLE))
3044 return 0;
3045
3046 elr = ext4_li_request_new(sb, first_not_zeroed);
3047 if (!elr)
3048 return -ENOMEM;
3049
3050 mutex_lock(&ext4_li_mtx);
3051
3052 if (NULL == ext4_li_info) {
3053 ret = ext4_li_info_new();
3054 if (ret)
3055 goto out;
3056 }
3057
3058 mutex_lock(&ext4_li_info->li_list_mtx);
3059 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3060 mutex_unlock(&ext4_li_info->li_list_mtx);
3061
3062 sbi->s_li_request = elr;
3063
3064
3065
3066
3067
3068 elr = NULL;
3069
3070 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3071 ret = ext4_run_lazyinit_thread();
3072 if (ret)
3073 goto out;
3074 }
3075out:
3076 mutex_unlock(&ext4_li_mtx);
3077 if (ret)
3078 kfree(elr);
3079 return ret;
3080}
3081
3082
3083
3084
3085
3086static void ext4_destroy_lazyinit_thread(void)
3087{
3088
3089
3090
3091
3092 if (!ext4_li_info || !ext4_lazyinit_task)
3093 return;
3094
3095 kthread_stop(ext4_lazyinit_task);
3096}
3097
3098static int set_journal_csum_feature_set(struct super_block *sb)
3099{
3100 int ret = 1;
3101 int compat, incompat;
3102 struct ext4_sb_info *sbi = EXT4_SB(sb);
3103
3104 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3105 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3106
3107 compat = 0;
3108 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3109 } else {
3110
3111 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3112 incompat = 0;
3113 }
3114
3115 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3116 ret = jbd2_journal_set_features(sbi->s_journal,
3117 compat, 0,
3118 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3119 incompat);
3120 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3121 ret = jbd2_journal_set_features(sbi->s_journal,
3122 compat, 0,
3123 incompat);
3124 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3125 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3126 } else {
3127 jbd2_journal_clear_features(sbi->s_journal,
3128 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3129 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3130 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3131 }
3132
3133 return ret;
3134}
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151static int count_overhead(struct super_block *sb, ext4_group_t grp,
3152 char *buf)
3153{
3154 struct ext4_sb_info *sbi = EXT4_SB(sb);
3155 struct ext4_group_desc *gdp;
3156 ext4_fsblk_t first_block, last_block, b;
3157 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3158 int s, j, count = 0;
3159
3160 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3161 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3162 sbi->s_itb_per_group + 2);
3163
3164 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3165 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3166 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3167 for (i = 0; i < ngroups; i++) {
3168 gdp = ext4_get_group_desc(sb, i, NULL);
3169 b = ext4_block_bitmap(sb, gdp);
3170 if (b >= first_block && b <= last_block) {
3171 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3172 count++;
3173 }
3174 b = ext4_inode_bitmap(sb, gdp);
3175 if (b >= first_block && b <= last_block) {
3176 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3177 count++;
3178 }
3179 b = ext4_inode_table(sb, gdp);
3180 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3181 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3182 int c = EXT4_B2C(sbi, b - first_block);
3183 ext4_set_bit(c, buf);
3184 count++;
3185 }
3186 if (i != grp)
3187 continue;
3188 s = 0;
3189 if (ext4_bg_has_super(sb, grp)) {
3190 ext4_set_bit(s++, buf);
3191 count++;
3192 }
3193 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3194 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3195 count++;
3196 }
3197 }
3198 if (!count)
3199 return 0;
3200 return EXT4_CLUSTERS_PER_GROUP(sb) -
3201 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3202}
3203
3204
3205
3206
3207int ext4_calculate_overhead(struct super_block *sb)
3208{
3209 struct ext4_sb_info *sbi = EXT4_SB(sb);
3210 struct ext4_super_block *es = sbi->s_es;
3211 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3212 ext4_fsblk_t overhead = 0;
3213 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3214
3215 memset(buf, 0, PAGE_SIZE);
3216 if (!buf)
3217 return -ENOMEM;
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3229
3230
3231
3232
3233 for (i = 0; i < ngroups; i++) {
3234 int blks;
3235
3236 blks = count_overhead(sb, i, buf);
3237 overhead += blks;
3238 if (blks)
3239 memset(buf, 0, PAGE_SIZE);
3240 cond_resched();
3241 }
3242 sbi->s_overhead = overhead;
3243 smp_wmb();
3244 free_page((unsigned long) buf);
3245 return 0;
3246}
3247
3248static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3249{
3250 char *orig_data = kstrdup(data, GFP_KERNEL);
3251 struct buffer_head *bh;
3252 struct ext4_super_block *es = NULL;
3253 struct ext4_sb_info *sbi;
3254 ext4_fsblk_t block;
3255 ext4_fsblk_t sb_block = get_sb_block(&data);
3256 ext4_fsblk_t logical_sb_block;
3257 unsigned long offset = 0;
3258 unsigned long journal_devnum = 0;
3259 unsigned long def_mount_opts;
3260 struct inode *root;
3261 char *cp;
3262 const char *descr;
3263 int ret = -ENOMEM;
3264 int blocksize, clustersize;
3265 unsigned int db_count;
3266 unsigned int i;
3267 int needs_recovery, has_huge_files, has_bigalloc;
3268 __u64 blocks_count;
3269 int err;
3270 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3271 ext4_group_t first_not_zeroed;
3272
3273 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3274 if (!sbi)
3275 goto out_free_orig;
3276
3277 sbi->s_blockgroup_lock =
3278 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3279 if (!sbi->s_blockgroup_lock) {
3280 kfree(sbi);
3281 goto out_free_orig;
3282 }
3283 sb->s_fs_info = sbi;
3284 sbi->s_sb = sb;
3285 sbi->s_mount_opt = 0;
3286 sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3287 sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
3288 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3289 sbi->s_sb_block = sb_block;
3290 if (sb->s_bdev->bd_part)
3291 sbi->s_sectors_written_start =
3292 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3293
3294
3295 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3296 *cp = '!';
3297
3298 ret = -EINVAL;
3299 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3300 if (!blocksize) {
3301 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3302 goto out_fail;
3303 }
3304
3305
3306
3307
3308
3309 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3310 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3311 offset = do_div(logical_sb_block, blocksize);
3312 } else {
3313 logical_sb_block = sb_block;
3314 }
3315
3316 if (!(bh = sb_bread(sb, logical_sb_block))) {
3317 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3318 goto out_fail;
3319 }
3320
3321
3322
3323
3324 es = (struct ext4_super_block *) (bh->b_data + offset);
3325 sbi->s_es = es;
3326 sb->s_magic = le16_to_cpu(es->s_magic);
3327 if (sb->s_magic != EXT4_SUPER_MAGIC)
3328 goto cantfind_ext4;
3329 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3330
3331
3332 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3333 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3334 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3335 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3336 "redundant flags; please run fsck.");
3337
3338
3339 if (!ext4_verify_csum_type(sb, es)) {
3340 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3341 "unknown checksum algorithm.");
3342 silent = 1;
3343 goto cantfind_ext4;
3344 }
3345
3346
3347 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3348 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3349 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3350 if (IS_ERR(sbi->s_chksum_driver)) {
3351 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3352 ret = PTR_ERR(sbi->s_chksum_driver);
3353 sbi->s_chksum_driver = NULL;
3354 goto failed_mount;
3355 }
3356 }
3357
3358
3359 if (!ext4_superblock_csum_verify(sb, es)) {
3360 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3361 "invalid superblock checksum. Run e2fsck?");
3362 silent = 1;
3363 goto cantfind_ext4;
3364 }
3365
3366
3367 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3368 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3369 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3370 sizeof(es->s_uuid));
3371
3372
3373 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3374 set_opt(sb, INIT_INODE_TABLE);
3375 if (def_mount_opts & EXT4_DEFM_DEBUG)
3376 set_opt(sb, DEBUG);
3377 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3378 set_opt(sb, GRPID);
3379 if (def_mount_opts & EXT4_DEFM_UID16)
3380 set_opt(sb, NO_UID32);
3381
3382#ifdef CONFIG_EXT4_FS_XATTR
3383 set_opt(sb, XATTR_USER);
3384#endif
3385#ifdef CONFIG_EXT4_FS_POSIX_ACL
3386 set_opt(sb, POSIX_ACL);
3387#endif
3388 set_opt(sb, MBLK_IO_SUBMIT);
3389 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3390 set_opt(sb, JOURNAL_DATA);
3391 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3392 set_opt(sb, ORDERED_DATA);
3393 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3394 set_opt(sb, WRITEBACK_DATA);
3395
3396 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3397 set_opt(sb, ERRORS_PANIC);
3398 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3399 set_opt(sb, ERRORS_CONT);
3400 else
3401 set_opt(sb, ERRORS_RO);
3402 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3403 set_opt(sb, BLOCK_VALIDITY);
3404 if (def_mount_opts & EXT4_DEFM_DISCARD)
3405 set_opt(sb, DISCARD);
3406
3407 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3408 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3409 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3410 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3411 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3412
3413 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3414 set_opt(sb, BARRIER);
3415
3416
3417
3418
3419
3420 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3421 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3422 set_opt(sb, DELALLOC);
3423
3424
3425
3426
3427
3428 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3429
3430 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3431 &journal_devnum, &journal_ioprio, 0)) {
3432 ext4_msg(sb, KERN_WARNING,
3433 "failed to parse options in superblock: %s",
3434 sbi->s_es->s_mount_opts);
3435 }
3436 sbi->s_def_mount_opt = sbi->s_mount_opt;
3437 if (!parse_options((char *) data, sb, &journal_devnum,
3438 &journal_ioprio, 0))
3439 goto failed_mount;
3440
3441 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3442 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3443 "with data=journal disables delayed "
3444 "allocation and O_DIRECT support!\n");
3445 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3446 ext4_msg(sb, KERN_ERR, "can't mount with "
3447 "both data=journal and delalloc");
3448 goto failed_mount;
3449 }
3450 if (test_opt(sb, DIOREAD_NOLOCK)) {
3451 ext4_msg(sb, KERN_ERR, "can't mount with "
3452 "both data=journal and delalloc");
3453 goto failed_mount;
3454 }
3455 if (test_opt(sb, DELALLOC))
3456 clear_opt(sb, DELALLOC);
3457 }
3458
3459 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3460 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3461
3462 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3463 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3464 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3465 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3466 ext4_msg(sb, KERN_WARNING,
3467 "feature flags set on rev 0 fs, "
3468 "running e2fsck is recommended");
3469
3470 if (IS_EXT2_SB(sb)) {
3471 if (ext2_feature_set_ok(sb))
3472 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3473 "using the ext4 subsystem");
3474 else {
3475 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3476 "to feature incompatibilities");
3477 goto failed_mount;
3478 }
3479 }
3480
3481 if (IS_EXT3_SB(sb)) {
3482 if (ext3_feature_set_ok(sb))
3483 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3484 "using the ext4 subsystem");
3485 else {
3486 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3487 "to feature incompatibilities");
3488 goto failed_mount;
3489 }
3490 }
3491
3492
3493
3494
3495
3496
3497 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3498 goto failed_mount;
3499
3500 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3501 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3502 blocksize > EXT4_MAX_BLOCK_SIZE) {
3503 ext4_msg(sb, KERN_ERR,
3504 "Unsupported filesystem blocksize %d", blocksize);
3505 goto failed_mount;
3506 }
3507
3508 if (sb->s_blocksize != blocksize) {
3509
3510 if (!sb_set_blocksize(sb, blocksize)) {
3511 ext4_msg(sb, KERN_ERR, "bad block size %d",
3512 blocksize);
3513 goto failed_mount;
3514 }
3515
3516 brelse(bh);
3517 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3518 offset = do_div(logical_sb_block, blocksize);
3519 bh = sb_bread(sb, logical_sb_block);
3520 if (!bh) {
3521 ext4_msg(sb, KERN_ERR,
3522 "Can't read superblock on 2nd try");
3523 goto failed_mount;
3524 }
3525 es = (struct ext4_super_block *)(bh->b_data + offset);
3526 sbi->s_es = es;
3527 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3528 ext4_msg(sb, KERN_ERR,
3529 "Magic mismatch, very weird!");
3530 goto failed_mount;
3531 }
3532 }
3533
3534 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3535 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3536 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3537 has_huge_files);
3538 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3539
3540 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3541 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3542 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3543 } else {
3544 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3545 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3546 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3547 (!is_power_of_2(sbi->s_inode_size)) ||
3548 (sbi->s_inode_size > blocksize)) {
3549 ext4_msg(sb, KERN_ERR,
3550 "unsupported inode size: %d",
3551 sbi->s_inode_size);
3552 goto failed_mount;
3553 }
3554 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3555 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3556 }
3557
3558 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3559 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3560 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3561 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3562 !is_power_of_2(sbi->s_desc_size)) {
3563 ext4_msg(sb, KERN_ERR,
3564 "unsupported descriptor size %lu",
3565 sbi->s_desc_size);
3566 goto failed_mount;
3567 }
3568 } else
3569 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3570
3571 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3572 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3573 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3574 goto cantfind_ext4;
3575
3576 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3577 if (sbi->s_inodes_per_block == 0)
3578 goto cantfind_ext4;
3579 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3580 sbi->s_inodes_per_block;
3581 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3582 sbi->s_sbh = bh;
3583 sbi->s_mount_state = le16_to_cpu(es->s_state);
3584 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3585 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3586
3587 for (i = 0; i < 4; i++)
3588 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3589 sbi->s_def_hash_version = es->s_def_hash_version;
3590 i = le32_to_cpu(es->s_flags);
3591 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3592 sbi->s_hash_unsigned = 3;
3593 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3594#ifdef __CHAR_UNSIGNED__
3595 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3596 sbi->s_hash_unsigned = 3;
3597#else
3598 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3599#endif
3600 }
3601
3602
3603 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3604 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3605 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3606 if (has_bigalloc) {
3607 if (clustersize < blocksize) {
3608 ext4_msg(sb, KERN_ERR,
3609 "cluster size (%d) smaller than "
3610 "block size (%d)", clustersize, blocksize);
3611 goto failed_mount;
3612 }
3613 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3614 le32_to_cpu(es->s_log_block_size);
3615 sbi->s_clusters_per_group =
3616 le32_to_cpu(es->s_clusters_per_group);
3617 if (sbi->s_clusters_per_group > blocksize * 8) {
3618 ext4_msg(sb, KERN_ERR,
3619 "#clusters per group too big: %lu",
3620 sbi->s_clusters_per_group);
3621 goto failed_mount;
3622 }
3623 if (sbi->s_blocks_per_group !=
3624 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3625 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3626 "clusters per group (%lu) inconsistent",
3627 sbi->s_blocks_per_group,
3628 sbi->s_clusters_per_group);
3629 goto failed_mount;
3630 }
3631 } else {
3632 if (clustersize != blocksize) {
3633 ext4_warning(sb, "fragment/cluster size (%d) != "
3634 "block size (%d)", clustersize,
3635 blocksize);
3636 clustersize = blocksize;
3637 }
3638 if (sbi->s_blocks_per_group > blocksize * 8) {
3639 ext4_msg(sb, KERN_ERR,
3640 "#blocks per group too big: %lu",
3641 sbi->s_blocks_per_group);
3642 goto failed_mount;
3643 }
3644 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3645 sbi->s_cluster_bits = 0;
3646 }
3647 sbi->s_cluster_ratio = clustersize / blocksize;
3648
3649 if (sbi->s_inodes_per_group > blocksize * 8) {
3650 ext4_msg(sb, KERN_ERR,
3651 "#inodes per group too big: %lu",
3652 sbi->s_inodes_per_group);
3653 goto failed_mount;
3654 }
3655
3656
3657
3658
3659
3660 err = generic_check_addressable(sb->s_blocksize_bits,
3661 ext4_blocks_count(es));
3662 if (err) {
3663 ext4_msg(sb, KERN_ERR, "filesystem"
3664 " too large to mount safely on this system");
3665 if (sizeof(sector_t) < 8)
3666 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3667 ret = err;
3668 goto failed_mount;
3669 }
3670
3671 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3672 goto cantfind_ext4;
3673
3674
3675 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3676 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3677 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3678 "exceeds size of device (%llu blocks)",
3679 ext4_blocks_count(es), blocks_count);
3680 goto failed_mount;
3681 }
3682
3683
3684
3685
3686
3687 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3688 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3689 "block %u is beyond end of filesystem (%llu)",
3690 le32_to_cpu(es->s_first_data_block),
3691 ext4_blocks_count(es));
3692 goto failed_mount;
3693 }
3694 blocks_count = (ext4_blocks_count(es) -
3695 le32_to_cpu(es->s_first_data_block) +
3696 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3697 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3698 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3699 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3700 "(block count %llu, first data block %u, "
3701 "blocks per group %lu)", sbi->s_groups_count,
3702 ext4_blocks_count(es),
3703 le32_to_cpu(es->s_first_data_block),
3704 EXT4_BLOCKS_PER_GROUP(sb));
3705 goto failed_mount;
3706 }
3707 sbi->s_groups_count = blocks_count;
3708 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3709 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3710 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3711 EXT4_DESC_PER_BLOCK(sb);
3712 sbi->s_group_desc = ext4_kvmalloc(db_count *
3713 sizeof(struct buffer_head *),
3714 GFP_KERNEL);
3715 if (sbi->s_group_desc == NULL) {
3716 ext4_msg(sb, KERN_ERR, "not enough memory");
3717 ret = -ENOMEM;
3718 goto failed_mount;
3719 }
3720
3721 if (ext4_proc_root)
3722 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3723
3724 if (sbi->s_proc)
3725 proc_create_data("options", S_IRUGO, sbi->s_proc,
3726 &ext4_seq_options_fops, sb);
3727
3728 bgl_lock_init(sbi->s_blockgroup_lock);
3729
3730 for (i = 0; i < db_count; i++) {
3731 block = descriptor_loc(sb, logical_sb_block, i);
3732 sbi->s_group_desc[i] = sb_bread(sb, block);
3733 if (!sbi->s_group_desc[i]) {
3734 ext4_msg(sb, KERN_ERR,
3735 "can't read group descriptor %d", i);
3736 db_count = i;
3737 goto failed_mount2;
3738 }
3739 }
3740 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3741 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3742 goto failed_mount2;
3743 }
3744 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3745 if (!ext4_fill_flex_info(sb)) {
3746 ext4_msg(sb, KERN_ERR,
3747 "unable to initialize "
3748 "flex_bg meta info!");
3749 goto failed_mount2;
3750 }
3751
3752 sbi->s_gdb_count = db_count;
3753 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3754 spin_lock_init(&sbi->s_next_gen_lock);
3755
3756 init_timer(&sbi->s_err_report);
3757 sbi->s_err_report.function = print_daily_error_info;
3758 sbi->s_err_report.data = (unsigned long) sb;
3759
3760 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3761 ext4_count_free_clusters(sb));
3762 if (!err) {
3763 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3764 ext4_count_free_inodes(sb));
3765 }
3766 if (!err) {
3767 err = percpu_counter_init(&sbi->s_dirs_counter,
3768 ext4_count_dirs(sb));
3769 }
3770 if (!err) {
3771 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3772 }
3773 if (err) {
3774 ext4_msg(sb, KERN_ERR, "insufficient memory");
3775 ret = err;
3776 goto failed_mount3;
3777 }
3778
3779 sbi->s_stripe = ext4_get_stripe_size(sbi);
3780 sbi->s_max_writeback_mb_bump = 128;
3781 sbi->s_extent_max_zeroout_kb = 32;
3782
3783
3784
3785
3786 if (!test_opt(sb, NOLOAD) &&
3787 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3788 sb->s_op = &ext4_sops;
3789 else
3790 sb->s_op = &ext4_nojournal_sops;
3791 sb->s_export_op = &ext4_export_ops;
3792 sb->s_xattr = ext4_xattr_handlers;
3793#ifdef CONFIG_QUOTA
3794 sb->s_qcop = &ext4_qctl_operations;
3795 sb->dq_op = &ext4_quota_operations;
3796
3797 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
3798
3799 sb->s_qcop = &ext4_qctl_sysfile_operations;
3800 }
3801#endif
3802 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3803
3804 INIT_LIST_HEAD(&sbi->s_orphan);
3805 mutex_init(&sbi->s_orphan_lock);
3806 sbi->s_resize_flags = 0;
3807
3808 sb->s_root = NULL;
3809
3810 needs_recovery = (es->s_last_orphan != 0 ||
3811 EXT4_HAS_INCOMPAT_FEATURE(sb,
3812 EXT4_FEATURE_INCOMPAT_RECOVER));
3813
3814 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3815 !(sb->s_flags & MS_RDONLY))
3816 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3817 goto failed_mount3;
3818
3819
3820
3821
3822
3823 if (!test_opt(sb, NOLOAD) &&
3824 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3825 if (ext4_load_journal(sb, es, journal_devnum))
3826 goto failed_mount3;
3827 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3828 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3829 ext4_msg(sb, KERN_ERR, "required journal recovery "
3830 "suppressed and not mounted read-only");
3831 goto failed_mount_wq;
3832 } else {
3833 clear_opt(sb, DATA_FLAGS);
3834 sbi->s_journal = NULL;
3835 needs_recovery = 0;
3836 goto no_journal;
3837 }
3838
3839 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3840 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3841 JBD2_FEATURE_INCOMPAT_64BIT)) {
3842 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3843 goto failed_mount_wq;
3844 }
3845
3846 if (!set_journal_csum_feature_set(sb)) {
3847 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3848 "feature set");
3849 goto failed_mount_wq;
3850 }
3851
3852
3853
3854 switch (test_opt(sb, DATA_FLAGS)) {
3855 case 0:
3856
3857
3858
3859
3860 if (jbd2_journal_check_available_features
3861 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3862 set_opt(sb, ORDERED_DATA);
3863 else
3864 set_opt(sb, JOURNAL_DATA);
3865 break;
3866
3867 case EXT4_MOUNT_ORDERED_DATA:
3868 case EXT4_MOUNT_WRITEBACK_DATA:
3869 if (!jbd2_journal_check_available_features
3870 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3871 ext4_msg(sb, KERN_ERR, "Journal does not support "
3872 "requested data journaling mode");
3873 goto failed_mount_wq;
3874 }
3875 default:
3876 break;
3877 }
3878 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3879
3880 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3881
3882
3883
3884
3885
3886 percpu_counter_set(&sbi->s_freeclusters_counter,
3887 ext4_count_free_clusters(sb));
3888 percpu_counter_set(&sbi->s_freeinodes_counter,
3889 ext4_count_free_inodes(sb));
3890 percpu_counter_set(&sbi->s_dirs_counter,
3891 ext4_count_dirs(sb));
3892 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3893
3894no_journal:
3895
3896
3897
3898
3899 if (es->s_overhead_clusters)
3900 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3901 else {
3902 ret = ext4_calculate_overhead(sb);
3903 if (ret)
3904 goto failed_mount_wq;
3905 }
3906
3907
3908
3909
3910
3911 EXT4_SB(sb)->dio_unwritten_wq =
3912 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3913 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3914 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3915 goto failed_mount_wq;
3916 }
3917
3918
3919
3920
3921
3922
3923 root = ext4_iget(sb, EXT4_ROOT_INO);
3924 if (IS_ERR(root)) {
3925 ext4_msg(sb, KERN_ERR, "get root inode failed");
3926 ret = PTR_ERR(root);
3927 root = NULL;
3928 goto failed_mount4;
3929 }
3930 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3931 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3932 iput(root);
3933 goto failed_mount4;
3934 }
3935 sb->s_root = d_make_root(root);
3936 if (!sb->s_root) {
3937 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3938 ret = -ENOMEM;
3939 goto failed_mount4;
3940 }
3941
3942 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3943 sb->s_flags |= MS_RDONLY;
3944
3945
3946 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3947 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3948 EXT4_GOOD_OLD_INODE_SIZE;
3949 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3950 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3951 if (sbi->s_want_extra_isize <
3952 le16_to_cpu(es->s_want_extra_isize))
3953 sbi->s_want_extra_isize =
3954 le16_to_cpu(es->s_want_extra_isize);
3955 if (sbi->s_want_extra_isize <
3956 le16_to_cpu(es->s_min_extra_isize))
3957 sbi->s_want_extra_isize =
3958 le16_to_cpu(es->s_min_extra_isize);
3959 }
3960 }
3961
3962 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3963 sbi->s_inode_size) {
3964 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3965 EXT4_GOOD_OLD_INODE_SIZE;
3966 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3967 "available");
3968 }
3969
3970 err = ext4_setup_system_zone(sb);
3971 if (err) {
3972 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3973 "zone (%d)", err);
3974 goto failed_mount4a;
3975 }
3976
3977 ext4_ext_init(sb);
3978 err = ext4_mb_init(sb);
3979 if (err) {
3980 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3981 err);
3982 goto failed_mount5;
3983 }
3984
3985 err = ext4_register_li_request(sb, first_not_zeroed);
3986 if (err)
3987 goto failed_mount6;
3988
3989 sbi->s_kobj.kset = ext4_kset;
3990 init_completion(&sbi->s_kobj_unregister);
3991 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3992 "%s", sb->s_id);
3993 if (err)
3994 goto failed_mount7;
3995
3996 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3997 ext4_orphan_cleanup(sb, es);
3998 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3999 if (needs_recovery) {
4000 ext4_msg(sb, KERN_INFO, "recovery complete");
4001 ext4_mark_recovery_complete(sb, es);
4002 }
4003 if (EXT4_SB(sb)->s_journal) {
4004 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4005 descr = " journalled data mode";
4006 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4007 descr = " ordered data mode";
4008 else
4009 descr = " writeback data mode";
4010 } else
4011 descr = "out journal";
4012
4013#ifdef CONFIG_QUOTA
4014
4015 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4016 !(sb->s_flags & MS_RDONLY)) {
4017 ret = ext4_enable_quotas(sb);
4018 if (ret)
4019 goto failed_mount7;
4020 }
4021#endif
4022
4023 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4024 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4025 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4026
4027 if (es->s_error_count)
4028 mod_timer(&sbi->s_err_report, jiffies + 300*HZ);
4029
4030 kfree(orig_data);
4031 return 0;
4032
4033cantfind_ext4:
4034 if (!silent)
4035 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4036 goto failed_mount;
4037
4038failed_mount7:
4039 ext4_unregister_li_request(sb);
4040failed_mount6:
4041 ext4_mb_release(sb);
4042failed_mount5:
4043 ext4_ext_release(sb);
4044 ext4_release_system_zone(sb);
4045failed_mount4a:
4046 dput(sb->s_root);
4047 sb->s_root = NULL;
4048failed_mount4:
4049 ext4_msg(sb, KERN_ERR, "mount failed");
4050 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4051failed_mount_wq:
4052 if (sbi->s_journal) {
4053 jbd2_journal_destroy(sbi->s_journal);
4054 sbi->s_journal = NULL;
4055 }
4056failed_mount3:
4057 del_timer(&sbi->s_err_report);
4058 if (sbi->s_flex_groups)
4059 ext4_kvfree(sbi->s_flex_groups);
4060 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4061 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4062 percpu_counter_destroy(&sbi->s_dirs_counter);
4063 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4064 if (sbi->s_mmp_tsk)
4065 kthread_stop(sbi->s_mmp_tsk);
4066failed_mount2:
4067 for (i = 0; i < db_count; i++)
4068 brelse(sbi->s_group_desc[i]);
4069 ext4_kvfree(sbi->s_group_desc);
4070failed_mount:
4071 if (sbi->s_chksum_driver)
4072 crypto_free_shash(sbi->s_chksum_driver);
4073 if (sbi->s_proc) {
4074 remove_proc_entry("options", sbi->s_proc);
4075 remove_proc_entry(sb->s_id, ext4_proc_root);
4076 }
4077#ifdef CONFIG_QUOTA
4078 for (i = 0; i < MAXQUOTAS; i++)
4079 kfree(sbi->s_qf_names[i]);
4080#endif
4081 ext4_blkdev_remove(sbi);
4082 brelse(bh);
4083out_fail:
4084 sb->s_fs_info = NULL;
4085 kfree(sbi->s_blockgroup_lock);
4086 kfree(sbi);
4087out_free_orig:
4088 kfree(orig_data);
4089 return ret;
4090}
4091
4092
4093
4094
4095
4096
4097static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4098{
4099 struct ext4_sb_info *sbi = EXT4_SB(sb);
4100
4101 journal->j_commit_interval = sbi->s_commit_interval;
4102 journal->j_min_batch_time = sbi->s_min_batch_time;
4103 journal->j_max_batch_time = sbi->s_max_batch_time;
4104
4105 write_lock(&journal->j_state_lock);
4106 if (test_opt(sb, BARRIER))
4107 journal->j_flags |= JBD2_BARRIER;
4108 else
4109 journal->j_flags &= ~JBD2_BARRIER;
4110 if (test_opt(sb, DATA_ERR_ABORT))
4111 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4112 else
4113 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4114 write_unlock(&journal->j_state_lock);
4115}
4116
4117static journal_t *ext4_get_journal(struct super_block *sb,
4118 unsigned int journal_inum)
4119{
4120 struct inode *journal_inode;
4121 journal_t *journal;
4122
4123 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4124
4125
4126
4127
4128
4129 journal_inode = ext4_iget(sb, journal_inum);
4130 if (IS_ERR(journal_inode)) {
4131 ext4_msg(sb, KERN_ERR, "no journal found");
4132 return NULL;
4133 }
4134 if (!journal_inode->i_nlink) {
4135 make_bad_inode(journal_inode);
4136 iput(journal_inode);
4137 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4138 return NULL;
4139 }
4140
4141 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4142 journal_inode, journal_inode->i_size);
4143 if (!S_ISREG(journal_inode->i_mode)) {
4144 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4145 iput(journal_inode);
4146 return NULL;
4147 }
4148
4149 journal = jbd2_journal_init_inode(journal_inode);
4150 if (!journal) {
4151 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4152 iput(journal_inode);
4153 return NULL;
4154 }
4155 journal->j_private = sb;
4156 ext4_init_journal_params(sb, journal);
4157 return journal;
4158}
4159
4160static journal_t *ext4_get_dev_journal(struct super_block *sb,
4161 dev_t j_dev)
4162{
4163 struct buffer_head *bh;
4164 journal_t *journal;
4165 ext4_fsblk_t start;
4166 ext4_fsblk_t len;
4167 int hblock, blocksize;
4168 ext4_fsblk_t sb_block;
4169 unsigned long offset;
4170 struct ext4_super_block *es;
4171 struct block_device *bdev;
4172
4173 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4174
4175 bdev = ext4_blkdev_get(j_dev, sb);
4176 if (bdev == NULL)
4177 return NULL;
4178
4179 blocksize = sb->s_blocksize;
4180 hblock = bdev_logical_block_size(bdev);
4181 if (blocksize < hblock) {
4182 ext4_msg(sb, KERN_ERR,
4183 "blocksize too small for journal device");
4184 goto out_bdev;
4185 }
4186
4187 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4188 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4189 set_blocksize(bdev, blocksize);
4190 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4191 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4192 "external journal");
4193 goto out_bdev;
4194 }
4195
4196 es = (struct ext4_super_block *) (bh->b_data + offset);
4197 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4198 !(le32_to_cpu(es->s_feature_incompat) &
4199 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4200 ext4_msg(sb, KERN_ERR, "external journal has "
4201 "bad superblock");
4202 brelse(bh);
4203 goto out_bdev;
4204 }
4205
4206 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4207 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4208 brelse(bh);
4209 goto out_bdev;
4210 }
4211
4212 len = ext4_blocks_count(es);
4213 start = sb_block + 1;
4214 brelse(bh);
4215
4216 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4217 start, len, blocksize);
4218 if (!journal) {
4219 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4220 goto out_bdev;
4221 }
4222 journal->j_private = sb;
4223 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4224 wait_on_buffer(journal->j_sb_buffer);
4225 if (!buffer_uptodate(journal->j_sb_buffer)) {
4226 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4227 goto out_journal;
4228 }
4229 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4230 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4231 "user (unsupported) - %d",
4232 be32_to_cpu(journal->j_superblock->s_nr_users));
4233 goto out_journal;
4234 }
4235 EXT4_SB(sb)->journal_bdev = bdev;
4236 ext4_init_journal_params(sb, journal);
4237 return journal;
4238
4239out_journal:
4240 jbd2_journal_destroy(journal);
4241out_bdev:
4242 ext4_blkdev_put(bdev);
4243 return NULL;
4244}
4245
4246static int ext4_load_journal(struct super_block *sb,
4247 struct ext4_super_block *es,
4248 unsigned long journal_devnum)
4249{
4250 journal_t *journal;
4251 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4252 dev_t journal_dev;
4253 int err = 0;
4254 int really_read_only;
4255
4256 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4257
4258 if (journal_devnum &&
4259 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4260 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4261 "numbers have changed");
4262 journal_dev = new_decode_dev(journal_devnum);
4263 } else
4264 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4265
4266 really_read_only = bdev_read_only(sb->s_bdev);
4267
4268
4269
4270
4271
4272
4273 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4274 if (sb->s_flags & MS_RDONLY) {
4275 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4276 "required on readonly filesystem");
4277 if (really_read_only) {
4278 ext4_msg(sb, KERN_ERR, "write access "
4279 "unavailable, cannot proceed");
4280 return -EROFS;
4281 }
4282 ext4_msg(sb, KERN_INFO, "write access will "
4283 "be enabled during recovery");
4284 }
4285 }
4286
4287 if (journal_inum && journal_dev) {
4288 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4289 "and inode journals!");
4290 return -EINVAL;
4291 }
4292
4293 if (journal_inum) {
4294 if (!(journal = ext4_get_journal(sb, journal_inum)))
4295 return -EINVAL;
4296 } else {
4297 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4298 return -EINVAL;
4299 }
4300
4301 if (!(journal->j_flags & JBD2_BARRIER))
4302 ext4_msg(sb, KERN_INFO, "barriers disabled");
4303
4304 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4305 err = jbd2_journal_wipe(journal, !really_read_only);
4306 if (!err) {
4307 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4308 if (save)
4309 memcpy(save, ((char *) es) +
4310 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4311 err = jbd2_journal_load(journal);
4312 if (save)
4313 memcpy(((char *) es) + EXT4_S_ERR_START,
4314 save, EXT4_S_ERR_LEN);
4315 kfree(save);
4316 }
4317
4318 if (err) {
4319 ext4_msg(sb, KERN_ERR, "error loading journal");
4320 jbd2_journal_destroy(journal);
4321 return err;
4322 }
4323
4324 EXT4_SB(sb)->s_journal = journal;
4325 ext4_clear_journal_err(sb, es);
4326
4327 if (!really_read_only && journal_devnum &&
4328 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4329 es->s_journal_dev = cpu_to_le32(journal_devnum);
4330
4331
4332 ext4_commit_super(sb, 1);
4333 }
4334
4335 return 0;
4336}
4337
4338static int ext4_commit_super(struct super_block *sb, int sync)
4339{
4340 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4341 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4342 int error = 0;
4343
4344 if (!sbh || block_device_ejected(sb))
4345 return error;
4346 if (buffer_write_io_error(sbh)) {
4347
4348
4349
4350
4351
4352
4353
4354
4355 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4356 "superblock detected");
4357 clear_buffer_write_io_error(sbh);
4358 set_buffer_uptodate(sbh);
4359 }
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370 if (!(sb->s_flags & MS_RDONLY))
4371 es->s_wtime = cpu_to_le32(get_seconds());
4372 if (sb->s_bdev->bd_part)
4373 es->s_kbytes_written =
4374 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4375 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4376 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4377 else
4378 es->s_kbytes_written =
4379 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4380 ext4_free_blocks_count_set(es,
4381 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4382 &EXT4_SB(sb)->s_freeclusters_counter)));
4383 es->s_free_inodes_count =
4384 cpu_to_le32(percpu_counter_sum_positive(
4385 &EXT4_SB(sb)->s_freeinodes_counter));
4386 BUFFER_TRACE(sbh, "marking dirty");
4387 ext4_superblock_csum_set(sb);
4388 mark_buffer_dirty(sbh);
4389 if (sync) {
4390 error = sync_dirty_buffer(sbh);
4391 if (error)
4392 return error;
4393
4394 error = buffer_write_io_error(sbh);
4395 if (error) {
4396 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4397 "superblock");
4398 clear_buffer_write_io_error(sbh);
4399 set_buffer_uptodate(sbh);
4400 }
4401 }
4402 return error;
4403}
4404
4405
4406
4407
4408
4409
4410static void ext4_mark_recovery_complete(struct super_block *sb,
4411 struct ext4_super_block *es)
4412{
4413 journal_t *journal = EXT4_SB(sb)->s_journal;
4414
4415 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4416 BUG_ON(journal != NULL);
4417 return;
4418 }
4419 jbd2_journal_lock_updates(journal);
4420 if (jbd2_journal_flush(journal) < 0)
4421 goto out;
4422
4423 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4424 sb->s_flags & MS_RDONLY) {
4425 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4426 ext4_commit_super(sb, 1);
4427 }
4428
4429out:
4430 jbd2_journal_unlock_updates(journal);
4431}
4432
4433
4434
4435
4436
4437
4438static void ext4_clear_journal_err(struct super_block *sb,
4439 struct ext4_super_block *es)
4440{
4441 journal_t *journal;
4442 int j_errno;
4443 const char *errstr;
4444
4445 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4446
4447 journal = EXT4_SB(sb)->s_journal;
4448
4449
4450
4451
4452
4453
4454 j_errno = jbd2_journal_errno(journal);
4455 if (j_errno) {
4456 char nbuf[16];
4457
4458 errstr = ext4_decode_error(sb, j_errno, nbuf);
4459 ext4_warning(sb, "Filesystem error recorded "
4460 "from previous mount: %s", errstr);
4461 ext4_warning(sb, "Marking fs in need of filesystem check.");
4462
4463 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4464 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4465 ext4_commit_super(sb, 1);
4466
4467 jbd2_journal_clear_err(journal);
4468 jbd2_journal_update_sb_errno(journal);
4469 }
4470}
4471
4472
4473
4474
4475
4476int ext4_force_commit(struct super_block *sb)
4477{
4478 journal_t *journal;
4479 int ret = 0;
4480
4481 if (sb->s_flags & MS_RDONLY)
4482 return 0;
4483
4484 journal = EXT4_SB(sb)->s_journal;
4485 if (journal)
4486 ret = ext4_journal_force_commit(journal);
4487
4488 return ret;
4489}
4490
4491static int ext4_sync_fs(struct super_block *sb, int wait)
4492{
4493 int ret = 0;
4494 tid_t target;
4495 struct ext4_sb_info *sbi = EXT4_SB(sb);
4496
4497 trace_ext4_sync_fs(sb, wait);
4498 flush_workqueue(sbi->dio_unwritten_wq);
4499
4500
4501
4502
4503 dquot_writeback_dquots(sb, -1);
4504 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4505 if (wait)
4506 jbd2_log_wait_commit(sbi->s_journal, target);
4507 }
4508 return ret;
4509}
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519static int ext4_freeze(struct super_block *sb)
4520{
4521 int error = 0;
4522 journal_t *journal;
4523
4524 if (sb->s_flags & MS_RDONLY)
4525 return 0;
4526
4527 journal = EXT4_SB(sb)->s_journal;
4528
4529
4530 jbd2_journal_lock_updates(journal);
4531
4532
4533
4534
4535
4536 error = jbd2_journal_flush(journal);
4537 if (error < 0)
4538 goto out;
4539
4540
4541 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4542 error = ext4_commit_super(sb, 1);
4543out:
4544
4545 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4546 return error;
4547}
4548
4549
4550
4551
4552
4553static int ext4_unfreeze(struct super_block *sb)
4554{
4555 if (sb->s_flags & MS_RDONLY)
4556 return 0;
4557
4558
4559 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4560 ext4_commit_super(sb, 1);
4561 return 0;
4562}
4563
4564
4565
4566
4567struct ext4_mount_options {
4568 unsigned long s_mount_opt;
4569 unsigned long s_mount_opt2;
4570 kuid_t s_resuid;
4571 kgid_t s_resgid;
4572 unsigned long s_commit_interval;
4573 u32 s_min_batch_time, s_max_batch_time;
4574#ifdef CONFIG_QUOTA
4575 int s_jquota_fmt;
4576 char *s_qf_names[MAXQUOTAS];
4577#endif
4578};
4579
4580static int ext4_remount(struct super_block *sb, int *flags, char *data)
4581{
4582 struct ext4_super_block *es;
4583 struct ext4_sb_info *sbi = EXT4_SB(sb);
4584 unsigned long old_sb_flags;
4585 struct ext4_mount_options old_opts;
4586 int enable_quota = 0;
4587 ext4_group_t g;
4588 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4589 int err = 0;
4590#ifdef CONFIG_QUOTA
4591 int i;
4592#endif
4593 char *orig_data = kstrdup(data, GFP_KERNEL);
4594
4595
4596 old_sb_flags = sb->s_flags;
4597 old_opts.s_mount_opt = sbi->s_mount_opt;
4598 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4599 old_opts.s_resuid = sbi->s_resuid;
4600 old_opts.s_resgid = sbi->s_resgid;
4601 old_opts.s_commit_interval = sbi->s_commit_interval;
4602 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4603 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4604#ifdef CONFIG_QUOTA
4605 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4606 for (i = 0; i < MAXQUOTAS; i++)
4607 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4608#endif
4609 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4610 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4611
4612
4613
4614
4615 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4616 err = -EINVAL;
4617 goto restore_opts;
4618 }
4619
4620 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4621 ext4_abort(sb, "Abort forced by user");
4622
4623 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4624 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4625
4626 es = sbi->s_es;
4627
4628 if (sbi->s_journal) {
4629 ext4_init_journal_params(sb, sbi->s_journal);
4630 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4631 }
4632
4633 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4634 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4635 err = -EROFS;
4636 goto restore_opts;
4637 }
4638
4639 if (*flags & MS_RDONLY) {
4640 err = dquot_suspend(sb, -1);
4641 if (err < 0)
4642 goto restore_opts;
4643
4644
4645
4646
4647
4648 sb->s_flags |= MS_RDONLY;
4649
4650
4651
4652
4653
4654
4655 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4656 (sbi->s_mount_state & EXT4_VALID_FS))
4657 es->s_state = cpu_to_le16(sbi->s_mount_state);
4658
4659 if (sbi->s_journal)
4660 ext4_mark_recovery_complete(sb, es);
4661 } else {
4662
4663 if (!ext4_feature_set_ok(sb, 0)) {
4664 err = -EROFS;
4665 goto restore_opts;
4666 }
4667
4668
4669
4670
4671 for (g = 0; g < sbi->s_groups_count; g++) {
4672 struct ext4_group_desc *gdp =
4673 ext4_get_group_desc(sb, g, NULL);
4674
4675 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4676 ext4_msg(sb, KERN_ERR,
4677 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4678 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4679 le16_to_cpu(gdp->bg_checksum));
4680 err = -EINVAL;
4681 goto restore_opts;
4682 }
4683 }
4684
4685
4686
4687
4688
4689
4690 if (es->s_last_orphan) {
4691 ext4_msg(sb, KERN_WARNING, "Couldn't "
4692 "remount RDWR because of unprocessed "
4693 "orphan inode list. Please "
4694 "umount/remount instead");
4695 err = -EINVAL;
4696 goto restore_opts;
4697 }
4698
4699
4700
4701
4702
4703
4704
4705 if (sbi->s_journal)
4706 ext4_clear_journal_err(sb, es);
4707 sbi->s_mount_state = le16_to_cpu(es->s_state);
4708 if (!ext4_setup_super(sb, es, 0))
4709 sb->s_flags &= ~MS_RDONLY;
4710 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4711 EXT4_FEATURE_INCOMPAT_MMP))
4712 if (ext4_multi_mount_protect(sb,
4713 le64_to_cpu(es->s_mmp_block))) {
4714 err = -EROFS;
4715 goto restore_opts;
4716 }
4717 enable_quota = 1;
4718 }
4719 }
4720
4721
4722
4723
4724
4725 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4726 ext4_unregister_li_request(sb);
4727 else {
4728 ext4_group_t first_not_zeroed;
4729 first_not_zeroed = ext4_has_uninit_itable(sb);
4730 ext4_register_li_request(sb, first_not_zeroed);
4731 }
4732
4733 ext4_setup_system_zone(sb);
4734 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4735 ext4_commit_super(sb, 1);
4736
4737#ifdef CONFIG_QUOTA
4738
4739 for (i = 0; i < MAXQUOTAS; i++)
4740 if (old_opts.s_qf_names[i] &&
4741 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4742 kfree(old_opts.s_qf_names[i]);
4743 if (enable_quota) {
4744 if (sb_any_quota_suspended(sb))
4745 dquot_resume(sb, -1);
4746 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4747 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4748 err = ext4_enable_quotas(sb);
4749 if (err)
4750 goto restore_opts;
4751 }
4752 }
4753#endif
4754
4755 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4756 kfree(orig_data);
4757 return 0;
4758
4759restore_opts:
4760 sb->s_flags = old_sb_flags;
4761 sbi->s_mount_opt = old_opts.s_mount_opt;
4762 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4763 sbi->s_resuid = old_opts.s_resuid;
4764 sbi->s_resgid = old_opts.s_resgid;
4765 sbi->s_commit_interval = old_opts.s_commit_interval;
4766 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4767 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4768#ifdef CONFIG_QUOTA
4769 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4770 for (i = 0; i < MAXQUOTAS; i++) {
4771 if (sbi->s_qf_names[i] &&
4772 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4773 kfree(sbi->s_qf_names[i]);
4774 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4775 }
4776#endif
4777 kfree(orig_data);
4778 return err;
4779}
4780
4781static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4782{
4783 struct super_block *sb = dentry->d_sb;
4784 struct ext4_sb_info *sbi = EXT4_SB(sb);
4785 struct ext4_super_block *es = sbi->s_es;
4786 ext4_fsblk_t overhead = 0;
4787 u64 fsid;
4788 s64 bfree;
4789
4790 if (!test_opt(sb, MINIX_DF))
4791 overhead = sbi->s_overhead;
4792
4793 buf->f_type = EXT4_SUPER_MAGIC;
4794 buf->f_bsize = sb->s_blocksize;
4795 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
4796 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4797 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4798
4799 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4800 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4801 if (buf->f_bfree < ext4_r_blocks_count(es))
4802 buf->f_bavail = 0;
4803 buf->f_files = le32_to_cpu(es->s_inodes_count);
4804 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4805 buf->f_namelen = EXT4_NAME_LEN;
4806 fsid = le64_to_cpup((void *)es->s_uuid) ^
4807 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4808 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4809 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4810
4811 return 0;
4812}
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824#ifdef CONFIG_QUOTA
4825
4826static inline struct inode *dquot_to_inode(struct dquot *dquot)
4827{
4828 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4829}
4830
4831static int ext4_write_dquot(struct dquot *dquot)
4832{
4833 int ret, err;
4834 handle_t *handle;
4835 struct inode *inode;
4836
4837 inode = dquot_to_inode(dquot);
4838 handle = ext4_journal_start(inode,
4839 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4840 if (IS_ERR(handle))
4841 return PTR_ERR(handle);
4842 ret = dquot_commit(dquot);
4843 err = ext4_journal_stop(handle);
4844 if (!ret)
4845 ret = err;
4846 return ret;
4847}
4848
4849static int ext4_acquire_dquot(struct dquot *dquot)
4850{
4851 int ret, err;
4852 handle_t *handle;
4853
4854 handle = ext4_journal_start(dquot_to_inode(dquot),
4855 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4856 if (IS_ERR(handle))
4857 return PTR_ERR(handle);
4858 ret = dquot_acquire(dquot);
4859 err = ext4_journal_stop(handle);
4860 if (!ret)
4861 ret = err;
4862 return ret;
4863}
4864
4865static int ext4_release_dquot(struct dquot *dquot)
4866{
4867 int ret, err;
4868 handle_t *handle;
4869
4870 handle = ext4_journal_start(dquot_to_inode(dquot),
4871 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4872 if (IS_ERR(handle)) {
4873
4874 dquot_release(dquot);
4875 return PTR_ERR(handle);
4876 }
4877 ret = dquot_release(dquot);
4878 err = ext4_journal_stop(handle);
4879 if (!ret)
4880 ret = err;
4881 return ret;
4882}
4883
4884static int ext4_mark_dquot_dirty(struct dquot *dquot)
4885{
4886
4887 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4888 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
4889 dquot_mark_dquot_dirty(dquot);
4890 return ext4_write_dquot(dquot);
4891 } else {
4892 return dquot_mark_dquot_dirty(dquot);
4893 }
4894}
4895
4896static int ext4_write_info(struct super_block *sb, int type)
4897{
4898 int ret, err;
4899 handle_t *handle;
4900
4901
4902 handle = ext4_journal_start(sb->s_root->d_inode, 2);
4903 if (IS_ERR(handle))
4904 return PTR_ERR(handle);
4905 ret = dquot_commit_info(sb, type);
4906 err = ext4_journal_stop(handle);
4907 if (!ret)
4908 ret = err;
4909 return ret;
4910}
4911
4912
4913
4914
4915
4916static int ext4_quota_on_mount(struct super_block *sb, int type)
4917{
4918 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4919 EXT4_SB(sb)->s_jquota_fmt, type);
4920}
4921
4922
4923
4924
4925static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4926 struct path *path)
4927{
4928 int err;
4929
4930 if (!test_opt(sb, QUOTA))
4931 return -EINVAL;
4932
4933
4934 if (path->dentry->d_sb != sb)
4935 return -EXDEV;
4936
4937 if (EXT4_SB(sb)->s_qf_names[type]) {
4938
4939 if (path->dentry->d_parent != sb->s_root)
4940 ext4_msg(sb, KERN_WARNING,
4941 "Quota file not on filesystem root. "
4942 "Journaled quota will not work");
4943 }
4944
4945
4946
4947
4948
4949 if (EXT4_SB(sb)->s_journal &&
4950 ext4_should_journal_data(path->dentry->d_inode)) {
4951
4952
4953
4954
4955 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4956 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4957 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4958 if (err)
4959 return err;
4960 }
4961
4962 return dquot_quota_on(sb, type, format_id, path);
4963}
4964
4965static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4966 unsigned int flags)
4967{
4968 int err;
4969 struct inode *qf_inode;
4970 unsigned long qf_inums[MAXQUOTAS] = {
4971 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4972 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4973 };
4974
4975 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4976
4977 if (!qf_inums[type])
4978 return -EPERM;
4979
4980 qf_inode = ext4_iget(sb, qf_inums[type]);
4981 if (IS_ERR(qf_inode)) {
4982 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4983 return PTR_ERR(qf_inode);
4984 }
4985
4986 err = dquot_enable(qf_inode, type, format_id, flags);
4987 iput(qf_inode);
4988
4989 return err;
4990}
4991
4992
4993static int ext4_enable_quotas(struct super_block *sb)
4994{
4995 int type, err = 0;
4996 unsigned long qf_inums[MAXQUOTAS] = {
4997 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4998 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4999 };
5000
5001 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5002 for (type = 0; type < MAXQUOTAS; type++) {
5003 if (qf_inums[type]) {
5004 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5005 DQUOT_USAGE_ENABLED);
5006 if (err) {
5007 ext4_warning(sb,
5008 "Failed to enable quota (type=%d) "
5009 "tracking. Please run e2fsck to fix.",
5010 type);
5011 return err;
5012 }
5013 }
5014 }
5015 return 0;
5016}
5017
5018
5019
5020
5021static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5022 int format_id)
5023{
5024 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5025 return -EINVAL;
5026
5027
5028
5029
5030 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5031}
5032
5033static int ext4_quota_off(struct super_block *sb, int type)
5034{
5035 struct inode *inode = sb_dqopt(sb)->files[type];
5036 handle_t *handle;
5037
5038
5039
5040 if (test_opt(sb, DELALLOC))
5041 sync_filesystem(sb);
5042
5043 if (!inode)
5044 goto out;
5045
5046
5047
5048 handle = ext4_journal_start(inode, 1);
5049 if (IS_ERR(handle))
5050 goto out;
5051 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5052 ext4_mark_inode_dirty(handle, inode);
5053 ext4_journal_stop(handle);
5054
5055out:
5056 return dquot_quota_off(sb, type);
5057}
5058
5059
5060
5061
5062static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5063{
5064 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5065 return -EINVAL;
5066
5067
5068 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5069}
5070
5071
5072
5073
5074
5075static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5076 size_t len, loff_t off)
5077{
5078 struct inode *inode = sb_dqopt(sb)->files[type];
5079 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5080 int err = 0;
5081 int offset = off & (sb->s_blocksize - 1);
5082 int tocopy;
5083 size_t toread;
5084 struct buffer_head *bh;
5085 loff_t i_size = i_size_read(inode);
5086
5087 if (off > i_size)
5088 return 0;
5089 if (off+len > i_size)
5090 len = i_size-off;
5091 toread = len;
5092 while (toread > 0) {
5093 tocopy = sb->s_blocksize - offset < toread ?
5094 sb->s_blocksize - offset : toread;
5095 bh = ext4_bread(NULL, inode, blk, 0, &err);
5096 if (err)
5097 return err;
5098 if (!bh)
5099 memset(data, 0, tocopy);
5100 else
5101 memcpy(data, bh->b_data+offset, tocopy);
5102 brelse(bh);
5103 offset = 0;
5104 toread -= tocopy;
5105 data += tocopy;
5106 blk++;
5107 }
5108 return len;
5109}
5110
5111
5112
5113static ssize_t ext4_quota_write(struct super_block *sb, int type,
5114 const char *data, size_t len, loff_t off)
5115{
5116 struct inode *inode = sb_dqopt(sb)->files[type];
5117 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5118 int err = 0;
5119 int offset = off & (sb->s_blocksize - 1);
5120 struct buffer_head *bh;
5121 handle_t *handle = journal_current_handle();
5122
5123 if (EXT4_SB(sb)->s_journal && !handle) {
5124 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5125 " cancelled because transaction is not started",
5126 (unsigned long long)off, (unsigned long long)len);
5127 return -EIO;
5128 }
5129
5130
5131
5132
5133 if (sb->s_blocksize - offset < len) {
5134 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5135 " cancelled because not block aligned",
5136 (unsigned long long)off, (unsigned long long)len);
5137 return -EIO;
5138 }
5139
5140 bh = ext4_bread(handle, inode, blk, 1, &err);
5141 if (!bh)
5142 goto out;
5143 err = ext4_journal_get_write_access(handle, bh);
5144 if (err) {
5145 brelse(bh);
5146 goto out;
5147 }
5148 lock_buffer(bh);
5149 memcpy(bh->b_data+offset, data, len);
5150 flush_dcache_page(bh->b_page);
5151 unlock_buffer(bh);
5152 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5153 brelse(bh);
5154out:
5155 if (err)
5156 return err;
5157 if (inode->i_size < off + len) {
5158 i_size_write(inode, off + len);
5159 EXT4_I(inode)->i_disksize = inode->i_size;
5160 ext4_mark_inode_dirty(handle, inode);
5161 }
5162 return len;
5163}
5164
5165#endif
5166
5167static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5168 const char *dev_name, void *data)
5169{
5170 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5171}
5172
5173#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5174static inline void register_as_ext2(void)
5175{
5176 int err = register_filesystem(&ext2_fs_type);
5177 if (err)
5178 printk(KERN_WARNING
5179 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5180}
5181
5182static inline void unregister_as_ext2(void)
5183{
5184 unregister_filesystem(&ext2_fs_type);
5185}
5186
5187static inline int ext2_feature_set_ok(struct super_block *sb)
5188{
5189 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5190 return 0;
5191 if (sb->s_flags & MS_RDONLY)
5192 return 1;
5193 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5194 return 0;
5195 return 1;
5196}
5197MODULE_ALIAS("ext2");
5198#else
5199static inline void register_as_ext2(void) { }
5200static inline void unregister_as_ext2(void) { }
5201static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5202#endif
5203
5204#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5205static inline void register_as_ext3(void)
5206{
5207 int err = register_filesystem(&ext3_fs_type);
5208 if (err)
