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40#include <linux/module.h>
41#include <linux/string.h>
42#include <linux/slab.h>
43#include <linux/init.h>
44#include <linux/blkdev.h>
45#include <linux/parser.h>
46#include <linux/crc32.h>
47#include <linux/vfs.h>
48#include <linux/writeback.h>
49#include <linux/seq_file.h>
50#include <linux/mount.h>
51#include "nilfs.h"
52#include "export.h"
53#include "mdt.h"
54#include "alloc.h"
55#include "btree.h"
56#include "btnode.h"
57#include "page.h"
58#include "cpfile.h"
59#include "sufile.h"
60#include "ifile.h"
61#include "dat.h"
62#include "segment.h"
63#include "segbuf.h"
64
65MODULE_AUTHOR("NTT Corp.");
66MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
67 "(NILFS)");
68MODULE_LICENSE("GPL");
69
70static struct kmem_cache *nilfs_inode_cachep;
71struct kmem_cache *nilfs_transaction_cachep;
72struct kmem_cache *nilfs_segbuf_cachep;
73struct kmem_cache *nilfs_btree_path_cache;
74
75static int nilfs_setup_super(struct super_block *sb, int is_mount);
76static int nilfs_remount(struct super_block *sb, int *flags, char *data);
77
78static void nilfs_set_error(struct super_block *sb)
79{
80 struct the_nilfs *nilfs = sb->s_fs_info;
81 struct nilfs_super_block **sbp;
82
83 down_write(&nilfs->ns_sem);
84 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
85 nilfs->ns_mount_state |= NILFS_ERROR_FS;
86 sbp = nilfs_prepare_super(sb, 0);
87 if (likely(sbp)) {
88 sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
89 if (sbp[1])
90 sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
91 nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
92 }
93 }
94 up_write(&nilfs->ns_sem);
95}
96
97
98
99
100
101
102
103
104
105
106
107
108
109void nilfs_error(struct super_block *sb, const char *function,
110 const char *fmt, ...)
111{
112 struct the_nilfs *nilfs = sb->s_fs_info;
113 struct va_format vaf;
114 va_list args;
115
116 va_start(args, fmt);
117
118 vaf.fmt = fmt;
119 vaf.va = &args;
120
121 printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n",
122 sb->s_id, function, &vaf);
123
124 va_end(args);
125
126 if (!(sb->s_flags & MS_RDONLY)) {
127 nilfs_set_error(sb);
128
129 if (nilfs_test_opt(nilfs, ERRORS_RO)) {
130 printk(KERN_CRIT "Remounting filesystem read-only\n");
131 sb->s_flags |= MS_RDONLY;
132 }
133 }
134
135 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
136 panic("NILFS (device %s): panic forced after error\n",
137 sb->s_id);
138}
139
140void nilfs_warning(struct super_block *sb, const char *function,
141 const char *fmt, ...)
142{
143 struct va_format vaf;
144 va_list args;
145
146 va_start(args, fmt);
147
148 vaf.fmt = fmt;
149 vaf.va = &args;
150
151 printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n",
152 sb->s_id, function, &vaf);
153
154 va_end(args);
155}
156
157
158struct inode *nilfs_alloc_inode(struct super_block *sb)
159{
160 struct nilfs_inode_info *ii;
161
162 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
163 if (!ii)
164 return NULL;
165 ii->i_bh = NULL;
166 ii->i_state = 0;
167 ii->i_cno = 0;
168 ii->vfs_inode.i_version = 1;
169 nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode);
170 return &ii->vfs_inode;
171}
172
173static void nilfs_i_callback(struct rcu_head *head)
174{
175 struct inode *inode = container_of(head, struct inode, i_rcu);
176 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
177
178 if (mdi) {
179 kfree(mdi->mi_bgl);
180 kfree(mdi);
181 }
182 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
183}
184
185void nilfs_destroy_inode(struct inode *inode)
186{
187 call_rcu(&inode->i_rcu, nilfs_i_callback);
188}
189
190static int nilfs_sync_super(struct super_block *sb, int flag)
191{
192 struct the_nilfs *nilfs = sb->s_fs_info;
193 int err;
194
195 retry:
196 set_buffer_dirty(nilfs->ns_sbh[0]);
197 if (nilfs_test_opt(nilfs, BARRIER)) {
198 err = __sync_dirty_buffer(nilfs->ns_sbh[0],
199 WRITE_SYNC | WRITE_FLUSH_FUA);
200 } else {
201 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
202 }
203
204 if (unlikely(err)) {
205 printk(KERN_ERR
206 "NILFS: unable to write superblock (err=%d)\n", err);
207 if (err == -EIO && nilfs->ns_sbh[1]) {
208
209
210
211
212 memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0],
213 nilfs->ns_sbsize);
214 nilfs_fall_back_super_block(nilfs);
215 goto retry;
216 }
217 } else {
218 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
219
220 nilfs->ns_sbwcount++;
221
222
223
224
225
226 clear_nilfs_discontinued(nilfs);
227
228
229 if (nilfs->ns_sbh[1]) {
230 if (flag == NILFS_SB_COMMIT_ALL) {
231 set_buffer_dirty(nilfs->ns_sbh[1]);
232 if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0)
233 goto out;
234 }
235 if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) <
236 le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno))
237 sbp = nilfs->ns_sbp[1];
238 }
239
240 spin_lock(&nilfs->ns_last_segment_lock);
241 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
242 spin_unlock(&nilfs->ns_last_segment_lock);
243 }
244 out:
245 return err;
246}
247
248void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
249 struct the_nilfs *nilfs)
250{
251 sector_t nfreeblocks;
252
253
254 nilfs_count_free_blocks(nilfs, &nfreeblocks);
255 sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
256
257 spin_lock(&nilfs->ns_last_segment_lock);
258 sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
259 sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
260 sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
261 spin_unlock(&nilfs->ns_last_segment_lock);
262}
263
264struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
265 int flip)
266{
267 struct the_nilfs *nilfs = sb->s_fs_info;
268 struct nilfs_super_block **sbp = nilfs->ns_sbp;
269
270
271 if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
272 if (sbp[1] &&
273 sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
274 memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
275 } else {
276 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
277 sb->s_id);
278 return NULL;
279 }
280 } else if (sbp[1] &&
281 sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
282 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
283 }
284
285 if (flip && sbp[1])
286 nilfs_swap_super_block(nilfs);
287
288 return sbp;
289}
290
291int nilfs_commit_super(struct super_block *sb, int flag)
292{
293 struct the_nilfs *nilfs = sb->s_fs_info;
294 struct nilfs_super_block **sbp = nilfs->ns_sbp;
295 time_t t;
296
297
298 t = get_seconds();
299 nilfs->ns_sbwtime = t;
300 sbp[0]->s_wtime = cpu_to_le64(t);
301 sbp[0]->s_sum = 0;
302 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
303 (unsigned char *)sbp[0],
304 nilfs->ns_sbsize));
305 if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) {
306 sbp[1]->s_wtime = sbp[0]->s_wtime;
307 sbp[1]->s_sum = 0;
308 sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
309 (unsigned char *)sbp[1],
310 nilfs->ns_sbsize));
311 }
312 clear_nilfs_sb_dirty(nilfs);
313 nilfs->ns_flushed_device = 1;
314
315 smp_wmb();
316 return nilfs_sync_super(sb, flag);
317}
318
319
320
321
322
323
324
325
326
327int nilfs_cleanup_super(struct super_block *sb)
328{
329 struct the_nilfs *nilfs = sb->s_fs_info;
330 struct nilfs_super_block **sbp;
331 int flag = NILFS_SB_COMMIT;
332 int ret = -EIO;
333
334 sbp = nilfs_prepare_super(sb, 0);
335 if (sbp) {
336 sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
337 nilfs_set_log_cursor(sbp[0], nilfs);
338 if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) {
339
340
341
342
343
344 sbp[1]->s_state = sbp[0]->s_state;
345 flag = NILFS_SB_COMMIT_ALL;
346 }
347 ret = nilfs_commit_super(sb, flag);
348 }
349 return ret;
350}
351
352
353
354
355
356
357static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off)
358{
359 struct the_nilfs *nilfs = sb->s_fs_info;
360 struct buffer_head *nsbh;
361 struct nilfs_super_block *nsbp;
362 sector_t blocknr, newblocknr;
363 unsigned long offset;
364 int sb2i;
365 int ret = 0;
366
367
368 if (nilfs->ns_sbh[1] &&
369 nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) {
370 sb2i = 1;
371 blocknr = nilfs->ns_sbh[1]->b_blocknr;
372 } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) {
373 sb2i = 0;
374 blocknr = nilfs->ns_sbh[0]->b_blocknr;
375 } else {
376 sb2i = -1;
377 blocknr = 0;
378 }
379 if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off)
380 goto out;
381
382
383 newblocknr = sb2off >> nilfs->ns_blocksize_bits;
384 offset = sb2off & (nilfs->ns_blocksize - 1);
385 nsbh = sb_getblk(sb, newblocknr);
386 if (!nsbh) {
387 printk(KERN_WARNING
388 "NILFS warning: unable to move secondary superblock "
389 "to block %llu\n", (unsigned long long)newblocknr);
390 ret = -EIO;
391 goto out;
392 }
393 nsbp = (void *)nsbh->b_data + offset;
394 memset(nsbp, 0, nilfs->ns_blocksize);
395
396 if (sb2i >= 0) {
397 memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
398 brelse(nilfs->ns_sbh[sb2i]);
399 nilfs->ns_sbh[sb2i] = nsbh;
400 nilfs->ns_sbp[sb2i] = nsbp;
401 } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) {
402
403 nilfs->ns_sbh[1] = nsbh;
404 nilfs->ns_sbp[1] = nsbp;
405 } else {
406 brelse(nsbh);
407 }
408out:
409 return ret;
410}
411
412
413
414
415
416
417int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
418{
419 struct the_nilfs *nilfs = sb->s_fs_info;
420 struct nilfs_super_block **sbp;
421 __u64 devsize, newnsegs;
422 loff_t sb2off;
423 int ret;
424
425 ret = -ERANGE;
426 devsize = i_size_read(sb->s_bdev->bd_inode);
427 if (newsize > devsize)
428 goto out;
429
430
431
432
433
434
435 down_write(&nilfs->ns_segctor_sem);
436
437 sb2off = NILFS_SB2_OFFSET_BYTES(newsize);
438 newnsegs = sb2off >> nilfs->ns_blocksize_bits;
439 do_div(newnsegs, nilfs->ns_blocks_per_segment);
440
441 ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs);
442 up_write(&nilfs->ns_segctor_sem);
443 if (ret < 0)
444 goto out;
445
446 ret = nilfs_construct_segment(sb);
447 if (ret < 0)
448 goto out;
449
450 down_write(&nilfs->ns_sem);
451 nilfs_move_2nd_super(sb, sb2off);
452 ret = -EIO;
453 sbp = nilfs_prepare_super(sb, 0);
454 if (likely(sbp)) {
455 nilfs_set_log_cursor(sbp[0], nilfs);
456
457
458
459
460
461 sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) &
462 ~NILFS_RESIZE_FS);
463 sbp[0]->s_dev_size = cpu_to_le64(newsize);
464 sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments);
465 if (sbp[1])
466 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
467 ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
468 }
469 up_write(&nilfs->ns_sem);
470
471
472
473
474
475
476
477 if (!ret)
478 nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1);
479out:
480 return ret;
481}
482
483static void nilfs_put_super(struct super_block *sb)
484{
485 struct the_nilfs *nilfs = sb->s_fs_info;
486
487 nilfs_detach_log_writer(sb);
488
489 if (!(sb->s_flags & MS_RDONLY)) {
490 down_write(&nilfs->ns_sem);
491 nilfs_cleanup_super(sb);
492 up_write(&nilfs->ns_sem);
493 }
494
495 iput(nilfs->ns_sufile);
496 iput(nilfs->ns_cpfile);
497 iput(nilfs->ns_dat);
498
499 destroy_nilfs(nilfs);
500 sb->s_fs_info = NULL;
501}
502
503static int nilfs_sync_fs(struct super_block *sb, int wait)
504{
505 struct the_nilfs *nilfs = sb->s_fs_info;
506 struct nilfs_super_block **sbp;
507 int err = 0;
508
509
510 if (wait)
511 err = nilfs_construct_segment(sb);
512
513 down_write(&nilfs->ns_sem);
514 if (nilfs_sb_dirty(nilfs)) {
515 sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs));
516 if (likely(sbp)) {
517 nilfs_set_log_cursor(sbp[0], nilfs);
518 nilfs_commit_super(sb, NILFS_SB_COMMIT);
519 }
520 }
521 up_write(&nilfs->ns_sem);
522
523 if (!err)
524 err = nilfs_flush_device(nilfs);
525
526 return err;
527}
528
529int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
530 struct nilfs_root **rootp)
531{
532 struct the_nilfs *nilfs = sb->s_fs_info;
533 struct nilfs_root *root;
534 struct nilfs_checkpoint *raw_cp;
535 struct buffer_head *bh_cp;
536 int err = -ENOMEM;
537
538 root = nilfs_find_or_create_root(
539 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
540 if (!root)
541 return err;
542
543 if (root->ifile)
544 goto reuse;
545
546 down_read(&nilfs->ns_segctor_sem);
547 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
548 &bh_cp);
549 up_read(&nilfs->ns_segctor_sem);
550 if (unlikely(err)) {
551 if (err == -ENOENT || err == -EINVAL) {
552 printk(KERN_ERR
553 "NILFS: Invalid checkpoint "
554 "(checkpoint number=%llu)\n",
555 (unsigned long long)cno);
556 err = -EINVAL;
557 }
558 goto failed;
559 }
560
561 err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
562 &raw_cp->cp_ifile_inode, &root->ifile);
563 if (err)
564 goto failed_bh;
565
566 atomic64_set(&root->inodes_count,
567 le64_to_cpu(raw_cp->cp_inodes_count));
568 atomic64_set(&root->blocks_count,
569 le64_to_cpu(raw_cp->cp_blocks_count));
570
571 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
572
573 reuse:
574 *rootp = root;
575 return 0;
576
577 failed_bh:
578 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
579 failed:
580 nilfs_put_root(root);
581
582 return err;
583}
584
585static int nilfs_freeze(struct super_block *sb)
586{
587 struct the_nilfs *nilfs = sb->s_fs_info;
588 int err;
589
590 if (sb->s_flags & MS_RDONLY)
591 return 0;
592
593
594 down_write(&nilfs->ns_sem);
595 err = nilfs_cleanup_super(sb);
596 up_write(&nilfs->ns_sem);
597 return err;
598}
599
600static int nilfs_unfreeze(struct super_block *sb)
601{
602 struct the_nilfs *nilfs = sb->s_fs_info;
603
604 if (sb->s_flags & MS_RDONLY)
605 return 0;
606
607 down_write(&nilfs->ns_sem);
608 nilfs_setup_super(sb, false);
609 up_write(&nilfs->ns_sem);
610 return 0;
611}
612
613static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
614{
615 struct super_block *sb = dentry->d_sb;
616 struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
617 struct the_nilfs *nilfs = root->nilfs;
618 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
619 unsigned long long blocks;
620 unsigned long overhead;
621 unsigned long nrsvblocks;
622 sector_t nfreeblocks;
623 u64 nmaxinodes, nfreeinodes;
624 int err;
625
626
627
628
629
630
631
632 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
633 - nilfs->ns_first_data_block;
634 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
635
636
637
638
639
640
641
642 overhead = 0;
643
644 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
645 if (unlikely(err))
646 return err;
647
648 err = nilfs_ifile_count_free_inodes(root->ifile,
649 &nmaxinodes, &nfreeinodes);
650 if (unlikely(err)) {
651 printk(KERN_WARNING
652 "NILFS warning: fail to count free inodes: err %d.\n",
653 err);
654 if (err == -ERANGE) {
655
656
657
658
659
660
661 nmaxinodes = atomic64_read(&root->inodes_count);
662 nfreeinodes = 0;
663 err = 0;
664 } else
665 return err;
666 }
667
668 buf->f_type = NILFS_SUPER_MAGIC;
669 buf->f_bsize = sb->s_blocksize;
670 buf->f_blocks = blocks - overhead;
671 buf->f_bfree = nfreeblocks;
672 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
673 (buf->f_bfree - nrsvblocks) : 0;
674 buf->f_files = nmaxinodes;
675 buf->f_ffree = nfreeinodes;
676 buf->f_namelen = NILFS_NAME_LEN;
677 buf->f_fsid.val[0] = (u32)id;
678 buf->f_fsid.val[1] = (u32)(id >> 32);
679
680 return 0;
681}
682
683static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry)
684{
685 struct super_block *sb = dentry->d_sb;
686 struct the_nilfs *nilfs = sb->s_fs_info;
687 struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
688
689 if (!nilfs_test_opt(nilfs, BARRIER))
690 seq_puts(seq, ",nobarrier");
691 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
692 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
693 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
694 seq_puts(seq, ",errors=panic");
695 if (nilfs_test_opt(nilfs, ERRORS_CONT))
696 seq_puts(seq, ",errors=continue");
697 if (nilfs_test_opt(nilfs, STRICT_ORDER))
698 seq_puts(seq, ",order=strict");
699 if (nilfs_test_opt(nilfs, NORECOVERY))
700 seq_puts(seq, ",norecovery");
701 if (nilfs_test_opt(nilfs, DISCARD))
702 seq_puts(seq, ",discard");
703
704 return 0;
705}
706
707static const struct super_operations nilfs_sops = {
708 .alloc_inode = nilfs_alloc_inode,
709 .destroy_inode = nilfs_destroy_inode,
710 .dirty_inode = nilfs_dirty_inode,
711 .evict_inode = nilfs_evict_inode,
712 .put_super = nilfs_put_super,
713 .sync_fs = nilfs_sync_fs,
714 .freeze_fs = nilfs_freeze,
715 .unfreeze_fs = nilfs_unfreeze,
716 .statfs = nilfs_statfs,
717 .remount_fs = nilfs_remount,
718 .show_options = nilfs_show_options
719};
720
721enum {
722 Opt_err_cont, Opt_err_panic, Opt_err_ro,
723 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
724 Opt_discard, Opt_nodiscard, Opt_err,
725};
726
727static match_table_t tokens = {
728 {Opt_err_cont, "errors=continue"},
729 {Opt_err_panic, "errors=panic"},
730 {Opt_err_ro, "errors=remount-ro"},
731 {Opt_barrier, "barrier"},
732 {Opt_nobarrier, "nobarrier"},
733 {Opt_snapshot, "cp=%u"},
734 {Opt_order, "order=%s"},
735 {Opt_norecovery, "norecovery"},
736 {Opt_discard, "discard"},
737 {Opt_nodiscard, "nodiscard"},
738 {Opt_err, NULL}
739};
740
741static int parse_options(char *options, struct super_block *sb, int is_remount)
742{
743 struct the_nilfs *nilfs = sb->s_fs_info;
744 char *p;
745 substring_t args[MAX_OPT_ARGS];
746
747 if (!options)
748 return 1;
749
750 while ((p = strsep(&options, ",")) != NULL) {
751 int token;
752 if (!*p)
753 continue;
754
755 token = match_token(p, tokens, args);
756 switch (token) {
757 case Opt_barrier:
758 nilfs_set_opt(nilfs, BARRIER);
759 break;
760 case Opt_nobarrier:
761 nilfs_clear_opt(nilfs, BARRIER);
762 break;
763 case Opt_order:
764 if (strcmp(args[0].from, "relaxed") == 0)
765
766 nilfs_clear_opt(nilfs, STRICT_ORDER);
767 else if (strcmp(args[0].from, "strict") == 0)
768
769 nilfs_set_opt(nilfs, STRICT_ORDER);
770 else
771 return 0;
772 break;
773 case Opt_err_panic:
774 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
775 break;
776 case Opt_err_ro:
777 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
778 break;
779 case Opt_err_cont:
780 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
781 break;
782 case Opt_snapshot:
783 if (is_remount) {
784 printk(KERN_ERR
785 "NILFS: \"%s\" option is invalid "
786 "for remount.\n", p);
787 return 0;
788 }
789 break;
790 case Opt_norecovery:
791 nilfs_set_opt(nilfs, NORECOVERY);
792 break;
793 case Opt_discard:
794 nilfs_set_opt(nilfs, DISCARD);
795 break;
796 case Opt_nodiscard:
797 nilfs_clear_opt(nilfs, DISCARD);
798 break;
799 default:
800 printk(KERN_ERR
801 "NILFS: Unrecognized mount option \"%s\"\n", p);
802 return 0;
803 }
804 }
805 return 1;
806}
807
808static inline void
809nilfs_set_default_options(struct super_block *sb,
810 struct nilfs_super_block *sbp)
811{
812 struct the_nilfs *nilfs = sb->s_fs_info;
813
814 nilfs->ns_mount_opt =
815 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
816}
817
818static int nilfs_setup_super(struct super_block *sb, int is_mount)
819{
820 struct the_nilfs *nilfs = sb->s_fs_info;
821 struct nilfs_super_block **sbp;
822 int max_mnt_count;
823 int mnt_count;
824
825
826 sbp = nilfs_prepare_super(sb, 0);
827 if (!sbp)
828 return -EIO;
829
830 if (!is_mount)
831 goto skip_mount_setup;
832
833 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
834 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
835
836 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
837 printk(KERN_WARNING
838 "NILFS warning: mounting fs with errors\n");
839#if 0
840 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
841 printk(KERN_WARNING
842 "NILFS warning: maximal mount count reached\n");
843#endif
844 }
845 if (!max_mnt_count)
846 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
847
848 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
849 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
850
851skip_mount_setup:
852 sbp[0]->s_state =
853 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
854
855 if (sbp[1])
856 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
857 return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
858}
859
860struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
861 u64 pos, int blocksize,
862 struct buffer_head **pbh)
863{
864 unsigned long long sb_index = pos;
865 unsigned long offset;
866
867 offset = do_div(sb_index, blocksize);
868 *pbh = sb_bread(sb, sb_index);
869 if (!*pbh)
870 return NULL;
871 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
872}
873
874int nilfs_store_magic_and_option(struct super_block *sb,
875 struct nilfs_super_block *sbp,
876 char *data)
877{
878 struct the_nilfs *nilfs = sb->s_fs_info;
879
880 sb->s_magic = le16_to_cpu(sbp->s_magic);
881
882
883#ifdef NILFS_ATIME_DISABLE
884 sb->s_flags |= MS_NOATIME;
885#endif
886
887 nilfs_set_default_options(sb, sbp);
888
889 nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
890 nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
891 nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
892 nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
893
894 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
895}
896
897int nilfs_check_feature_compatibility(struct super_block *sb,
898 struct nilfs_super_block *sbp)
899{
900 __u64 features;
901
902 features = le64_to_cpu(sbp->s_feature_incompat) &
903 ~NILFS_FEATURE_INCOMPAT_SUPP;
904 if (features) {
905 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
906 "optional features (%llx)\n",
907 (unsigned long long)features);
908 return -EINVAL;
909 }
910 features = le64_to_cpu(sbp->s_feature_compat_ro) &
911 ~NILFS_FEATURE_COMPAT_RO_SUPP;
912 if (!(sb->s_flags & MS_RDONLY) && features) {
913 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
914 "unsupported optional features (%llx)\n",
915 (unsigned long long)features);
916 return -EINVAL;
917 }
918 return 0;
919}
920
921static int nilfs_get_root_dentry(struct super_block *sb,
922 struct nilfs_root *root,
923 struct dentry **root_dentry)
924{
925 struct inode *inode;
926 struct dentry *dentry;
927 int ret = 0;
928
929 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
930 if (IS_ERR(inode)) {
931 printk(KERN_ERR "NILFS: get root inode failed\n");
932 ret = PTR_ERR(inode);
933 goto out;
934 }
935 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
936 iput(inode);
937 printk(KERN_ERR "NILFS: corrupt root inode.\n");
938 ret = -EINVAL;
939 goto out;
940 }
941
942 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
943 dentry = d_find_alias(inode);
944 if (!dentry) {
945 dentry = d_make_root(inode);
946 if (!dentry) {
947 ret = -ENOMEM;
948 goto failed_dentry;
949 }
950 } else {
951 iput(inode);
952 }
953 } else {
954 dentry = d_obtain_root(inode);
955 if (IS_ERR(dentry)) {
956 ret = PTR_ERR(dentry);
957 goto failed_dentry;
958 }
959 }
960 *root_dentry = dentry;
961 out:
962 return ret;
963
964 failed_dentry:
965 printk(KERN_ERR "NILFS: get root dentry failed\n");
966 goto out;
967}
968
969static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
970 struct dentry **root_dentry)
971{
972 struct the_nilfs *nilfs = s->s_fs_info;
973 struct nilfs_root *root;
974 int ret;
975
976 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
977
978 down_read(&nilfs->ns_segctor_sem);
979 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
980 up_read(&nilfs->ns_segctor_sem);
981 if (ret < 0) {
982 ret = (ret == -ENOENT) ? -EINVAL : ret;
983 goto out;
984 } else if (!ret) {
985 printk(KERN_ERR "NILFS: The specified checkpoint is "
986 "not a snapshot (checkpoint number=%llu).\n",
987 (unsigned long long)cno);
988 ret = -EINVAL;
989 goto out;
990 }
991
992 ret = nilfs_attach_checkpoint(s, cno, false, &root);
993 if (ret) {
994 printk(KERN_ERR "NILFS: error loading snapshot "
995 "(checkpoint number=%llu).\n",
996 (unsigned long long)cno);
997 goto out;
998 }
999 ret = nilfs_get_root_dentry(s, root, root_dentry);
1000 nilfs_put_root(root);
1001 out:
1002 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
1003 return ret;
1004}
1005
1006
1007
1008
1009
1010
1011
1012static bool nilfs_tree_is_busy(struct dentry *root_dentry)
1013{
1014 shrink_dcache_parent(root_dentry);
1015 return d_count(root_dentry) > 1;
1016}
1017
1018int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
1019{
1020 struct the_nilfs *nilfs = sb->s_fs_info;
1021 struct nilfs_root *root;
1022 struct inode *inode;
1023 struct dentry *dentry;
1024 int ret;
1025
1026 if (cno > nilfs->ns_cno)
1027 return false;
1028
1029 if (cno >= nilfs_last_cno(nilfs))
1030 return true;
1031
1032 ret = false;
1033 root = nilfs_lookup_root(nilfs, cno);
1034 if (root) {
1035 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
1036 if (inode) {
1037 dentry = d_find_alias(inode);
1038 if (dentry) {
1039 ret = nilfs_tree_is_busy(dentry);
1040 dput(dentry);
1041 }
1042 iput(inode);
1043 }
1044 nilfs_put_root(root);
1045 }
1046 return ret;
1047}
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058static int
1059nilfs_fill_super(struct super_block *sb, void *data, int silent)
1060{
1061 struct the_nilfs *nilfs;
1062 struct nilfs_root *fsroot;
1063 __u64 cno;
1064 int err;
1065
1066 nilfs = alloc_nilfs(sb->s_bdev);
1067 if (!nilfs)
1068 return -ENOMEM;
1069
1070 sb->s_fs_info = nilfs;
1071
1072 err = init_nilfs(nilfs, sb, (char *)data);
1073 if (err)
1074 goto failed_nilfs;
1075
1076 sb->s_op = &nilfs_sops;
1077 sb->s_export_op = &nilfs_export_ops;
1078 sb->s_root = NULL;
1079 sb->s_time_gran = 1;
1080 sb->s_max_links = NILFS_LINK_MAX;
1081
1082 sb->s_bdi = &bdev_get_queue(sb->s_bdev)->backing_dev_info;
1083
1084 err = load_nilfs(nilfs, sb);
1085 if (err)
1086 goto failed_nilfs;
1087
1088 cno = nilfs_last_cno(nilfs);
1089 err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
1090 if (err) {
1091 printk(KERN_ERR "NILFS: error loading last checkpoint "
1092 "(checkpoint number=%llu).\n", (unsigned long long)cno);
1093 goto failed_unload;
1094 }
1095
1096 if (!(sb->s_flags & MS_RDONLY)) {
1097 err = nilfs_attach_log_writer(sb, fsroot);
1098 if (err)
1099 goto failed_checkpoint;
1100 }
1101
1102 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
1103 if (err)
1104 goto failed_segctor;
1105
1106 nilfs_put_root(fsroot);
1107
1108 if (!(sb->s_flags & MS_RDONLY)) {
1109 down_write(&nilfs->ns_sem);
1110 nilfs_setup_super(sb, true);
1111 up_write(&nilfs->ns_sem);
1112 }
1113
1114 return 0;
1115
1116 failed_segctor:
1117 nilfs_detach_log_writer(sb);
1118
1119 failed_checkpoint:
1120 nilfs_put_root(fsroot);
1121
1122 failed_unload:
1123 iput(nilfs->ns_sufile);
1124 iput(nilfs->ns_cpfile);
1125 iput(nilfs->ns_dat);
1126
1127 failed_nilfs:
1128 destroy_nilfs(nilfs);
1129 return err;
1130}
1131
1132static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1133{
1134 struct the_nilfs *nilfs = sb->s_fs_info;
1135 unsigned long old_sb_flags;
1136 unsigned long old_mount_opt;
1137 int err;
1138
1139 sync_filesystem(sb);
1140 old_sb_flags = sb->s_flags;
1141 old_mount_opt = nilfs->ns_mount_opt;
1142
1143 if (!parse_options(data, sb, 1)) {
1144 err = -EINVAL;
1145 goto restore_opts;
1146 }
1147 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1148
1149 err = -EINVAL;
1150
1151 if (!nilfs_valid_fs(nilfs)) {
1152 printk(KERN_WARNING "NILFS (device %s): couldn't "
1153 "remount because the filesystem is in an "
1154 "incomplete recovery state.\n", sb->s_id);
1155 goto restore_opts;
1156 }
1157
1158 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1159 goto out;
1160 if (*flags & MS_RDONLY) {
1161
1162 nilfs_detach_log_writer(sb);
1163 sb->s_flags |= MS_RDONLY;
1164
1165
1166
1167
1168
1169 down_write(&nilfs->ns_sem);
1170 nilfs_cleanup_super(sb);
1171 up_write(&nilfs->ns_sem);
1172 } else {
1173 __u64 features;
1174 struct nilfs_root *root;
1175
1176
1177
1178
1179
1180
1181 down_read(&nilfs->ns_sem);
1182 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1183 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1184 up_read(&nilfs->ns_sem);
1185 if (features) {
1186 printk(KERN_WARNING "NILFS (device %s): couldn't "
1187 "remount RDWR because of unsupported optional "
1188 "features (%llx)\n",
1189 sb->s_id, (unsigned long long)features);
1190 err = -EROFS;
1191 goto restore_opts;
1192 }
1193
1194 sb->s_flags &= ~MS_RDONLY;
1195
1196 root = NILFS_I(d_inode(sb->s_root))->i_root;
1197 err = nilfs_attach_log_writer(sb, root);
1198 if (err)
1199 goto restore_opts;
1200
1201 down_write(&nilfs->ns_sem);
1202 nilfs_setup_super(sb, true);
1203 up_write(&nilfs->ns_sem);
1204 }
1205 out:
1206 return 0;
1207
1208 restore_opts:
1209 sb->s_flags = old_sb_flags;
1210 nilfs->ns_mount_opt = old_mount_opt;
1211 return err;
1212}
1213
1214struct nilfs_super_data {
1215 struct block_device *bdev;
1216 __u64 cno;
1217 int flags;
1218};
1219
1220
1221
1222
1223
1224
1225static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1226{
1227 char *p, *options = data;
1228 substring_t args[MAX_OPT_ARGS];
1229 int token;
1230 int ret = 0;
1231
1232 do {
1233 p = strsep(&options, ",");
1234 if (p != NULL && *p) {
1235 token = match_token(p, tokens, args);
1236 if (token == Opt_snapshot) {
1237 if (!(sd->flags & MS_RDONLY)) {
1238 ret++;
1239 } else {
1240 sd->cno = simple_strtoull(args[0].from,
1241 NULL, 0);
1242
1243
1244
1245
1246
1247 if (sd->cno == 0)
1248 ret++;
1249 }
1250 }
1251 if (ret)
1252 printk(KERN_ERR
1253 "NILFS: invalid mount option: %s\n", p);
1254 }
1255 if (!options)
1256 break;
1257 BUG_ON(options == data);
1258 *(options - 1) = ',';
1259 } while (!ret);
1260 return ret;
1261}
1262
1263static int nilfs_set_bdev_super(struct super_block *s, void *data)
1264{
1265 s->s_bdev = data;
1266 s->s_dev = s->s_bdev->bd_dev;
1267 return 0;
1268}
1269
1270static int nilfs_test_bdev_super(struct super_block *s, void *data)
1271{
1272 return (void *)s->s_bdev == data;
1273}
1274
1275static struct dentry *
1276nilfs_mount(struct file_system_type *fs_type, int flags,
1277 const char *dev_name, void *data)
1278{
1279 struct nilfs_super_data sd;
1280 struct super_block *s;
1281 fmode_t mode = FMODE_READ | FMODE_EXCL;
1282 struct dentry *root_dentry;
1283 int err, s_new = false;
1284
1285 if (!(flags & MS_RDONLY))
1286 mode |= FMODE_WRITE;
1287
1288 sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1289 if (IS_ERR(sd.bdev))
1290 return ERR_CAST(sd.bdev);
1291
1292 sd.cno = 0;
1293 sd.flags = flags;
1294 if (nilfs_identify((char *)data, &sd)) {
1295 err = -EINVAL;
1296 goto failed;
1297 }
1298
1299
1300
1301
1302
1303
1304 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1305 if (sd.bdev->bd_fsfreeze_count > 0) {
1306 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1307 err = -EBUSY;
1308 goto failed;
1309 }
1310 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags,
1311 sd.bdev);
1312 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1313 if (IS_ERR(s)) {
1314 err = PTR_ERR(s);
1315 goto failed;
1316 }
1317
1318 if (!s->s_root) {
1319 s_new = true;
1320
1321
1322 s->s_mode = mode;
1323 snprintf(s->s_id, sizeof(s->s_id), "%pg", sd.bdev);
1324 sb_set_blocksize(s, block_size(sd.bdev));
1325
1326 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
1327 if (err)
1328 goto failed_super;
1329
1330 s->s_flags |= MS_ACTIVE;
1331 } else if (!sd.cno) {
1332 if (nilfs_tree_is_busy(s->s_root)) {
1333 if ((flags ^ s->s_flags) & MS_RDONLY) {
1334 printk(KERN_ERR "NILFS: the device already "
1335 "has a %s mount.\n",
1336 (s->s_flags & MS_RDONLY) ?
1337 "read-only" : "read/write");
1338 err = -EBUSY;
1339 goto failed_super;
1340 }
1341 } else {
1342
1343
1344
1345
1346 err = nilfs_remount(s, &flags, data);
1347 if (err)
1348 goto failed_super;
1349 }
1350 }
1351
1352 if (sd.cno) {
1353 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
1354 if (err)
1355 goto failed_super;
1356 } else {
1357 root_dentry = dget(s->s_root);
1358 }
1359
1360 if (!s_new)
1361 blkdev_put(sd.bdev, mode);
1362
1363 return root_dentry;
1364
1365 failed_super:
1366 deactivate_locked_super(s);
1367
1368 failed:
1369 if (!s_new)
1370 blkdev_put(sd.bdev, mode);
1371 return ERR_PTR(err);
1372}
1373
1374struct file_system_type nilfs_fs_type = {
1375 .owner = THIS_MODULE,
1376 .name = "nilfs2",
1377 .mount = nilfs_mount,
1378 .kill_sb = kill_block_super,
1379 .fs_flags = FS_REQUIRES_DEV,
1380};
1381MODULE_ALIAS_FS("nilfs2");
1382
1383static void nilfs_inode_init_once(void *obj)
1384{
1385 struct nilfs_inode_info *ii = obj;
1386
1387 INIT_LIST_HEAD(&ii->i_dirty);
1388#ifdef CONFIG_NILFS_XATTR
1389 init_rwsem(&ii->xattr_sem);
1390#endif
1391 address_space_init_once(&ii->i_btnode_cache);
1392 ii->i_bmap = &ii->i_bmap_data;
1393 inode_init_once(&ii->vfs_inode);
1394}
1395
1396static void nilfs_segbuf_init_once(void *obj)
1397{
1398 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1399}
1400
1401static void nilfs_destroy_cachep(void)
1402{
1403
1404
1405
1406
1407 rcu_barrier();
1408
1409 kmem_cache_destroy(nilfs_inode_cachep);
1410 kmem_cache_destroy(nilfs_transaction_cachep);
1411 kmem_cache_destroy(nilfs_segbuf_cachep);
1412 kmem_cache_destroy(nilfs_btree_path_cache);
1413}
1414
1415static int __init nilfs_init_cachep(void)
1416{
1417 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1418 sizeof(struct nilfs_inode_info), 0,
1419 SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
1420 nilfs_inode_init_once);
1421 if (!nilfs_inode_cachep)
1422 goto fail;
1423
1424 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1425 sizeof(struct nilfs_transaction_info), 0,
1426 SLAB_RECLAIM_ACCOUNT, NULL);
1427 if (!nilfs_transaction_cachep)
1428 goto fail;
1429
1430 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1431 sizeof(struct nilfs_segment_buffer), 0,
1432 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1433 if (!nilfs_segbuf_cachep)
1434 goto fail;
1435
1436 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1437 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1438 0, 0, NULL);
1439 if (!nilfs_btree_path_cache)
1440 goto fail;
1441
1442 return 0;
1443
1444fail:
1445 nilfs_destroy_cachep();
1446 return -ENOMEM;
1447}
1448
1449static int __init init_nilfs_fs(void)
1450{
1451 int err;
1452
1453 err = nilfs_init_cachep();
1454 if (err)
1455 goto fail;
1456
1457 err = nilfs_sysfs_init();
1458 if (err)
1459 goto free_cachep;
1460
1461 err = register_filesystem(&nilfs_fs_type);
1462 if (err)
1463 goto deinit_sysfs_entry;
1464
1465 printk(KERN_INFO "NILFS version 2 loaded\n");
1466 return 0;
1467
1468deinit_sysfs_entry:
1469 nilfs_sysfs_exit();
1470free_cachep:
1471 nilfs_destroy_cachep();
1472fail:
1473 return err;
1474}
1475
1476static void __exit exit_nilfs_fs(void)
1477{
1478 nilfs_destroy_cachep();
1479 nilfs_sysfs_exit();
1480 unregister_filesystem(&nilfs_fs_type);
1481}
1482
1483module_init(init_nilfs_fs)
1484module_exit(exit_nilfs_fs)
1485