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29#include <linux/init.h>
30#include <linux/slab.h>
31#include <linux/module.h>
32#include <linux/ctype.h>
33#include <linux/kthread.h>
34#include <linux/parser.h>
35#include <linux/seq_file.h>
36#include <linux/mount.h>
37#include <linux/math64.h>
38#include <linux/writeback.h>
39#include "ubifs.h"
40
41
42
43
44
45#define UBIFS_KMALLOC_OK (128*1024)
46
47
48struct kmem_cache *ubifs_inode_slab;
49
50
51static struct shrinker ubifs_shrinker_info = {
52 .scan_objects = ubifs_shrink_scan,
53 .count_objects = ubifs_shrink_count,
54 .seeks = DEFAULT_SEEKS,
55};
56
57
58
59
60
61
62
63
64
65
66
67static int validate_inode(struct ubifs_info *c, const struct inode *inode)
68{
69 int err;
70 const struct ubifs_inode *ui = ubifs_inode(inode);
71
72 if (inode->i_size > c->max_inode_sz) {
73 ubifs_err("inode is too large (%lld)",
74 (long long)inode->i_size);
75 return 1;
76 }
77
78 if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
79 ubifs_err("unknown compression type %d", ui->compr_type);
80 return 2;
81 }
82
83 if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
84 return 3;
85
86 if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
87 return 4;
88
89 if (ui->xattr && !S_ISREG(inode->i_mode))
90 return 5;
91
92 if (!ubifs_compr_present(ui->compr_type)) {
93 ubifs_warn("inode %lu uses '%s' compression, but it was not compiled in",
94 inode->i_ino, ubifs_compr_name(ui->compr_type));
95 }
96
97 err = dbg_check_dir(c, inode);
98 return err;
99}
100
101struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
102{
103 int err;
104 union ubifs_key key;
105 struct ubifs_ino_node *ino;
106 struct ubifs_info *c = sb->s_fs_info;
107 struct inode *inode;
108 struct ubifs_inode *ui;
109
110 dbg_gen("inode %lu", inum);
111
112 inode = iget_locked(sb, inum);
113 if (!inode)
114 return ERR_PTR(-ENOMEM);
115 if (!(inode->i_state & I_NEW))
116 return inode;
117 ui = ubifs_inode(inode);
118
119 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
120 if (!ino) {
121 err = -ENOMEM;
122 goto out;
123 }
124
125 ino_key_init(c, &key, inode->i_ino);
126
127 err = ubifs_tnc_lookup(c, &key, ino);
128 if (err)
129 goto out_ino;
130
131 inode->i_flags |= (S_NOCMTIME | S_NOATIME);
132 set_nlink(inode, le32_to_cpu(ino->nlink));
133 i_uid_write(inode, le32_to_cpu(ino->uid));
134 i_gid_write(inode, le32_to_cpu(ino->gid));
135 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
136 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
137 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
138 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
139 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
140 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
141 inode->i_mode = le32_to_cpu(ino->mode);
142 inode->i_size = le64_to_cpu(ino->size);
143
144 ui->data_len = le32_to_cpu(ino->data_len);
145 ui->flags = le32_to_cpu(ino->flags);
146 ui->compr_type = le16_to_cpu(ino->compr_type);
147 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
148 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
149 ui->xattr_size = le32_to_cpu(ino->xattr_size);
150 ui->xattr_names = le32_to_cpu(ino->xattr_names);
151 ui->synced_i_size = ui->ui_size = inode->i_size;
152
153 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
154
155 err = validate_inode(c, inode);
156 if (err)
157 goto out_invalid;
158
159
160 inode->i_mapping->backing_dev_info = &c->bdi;
161
162 switch (inode->i_mode & S_IFMT) {
163 case S_IFREG:
164 inode->i_mapping->a_ops = &ubifs_file_address_operations;
165 inode->i_op = &ubifs_file_inode_operations;
166 inode->i_fop = &ubifs_file_operations;
167 if (ui->xattr) {
168 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
169 if (!ui->data) {
170 err = -ENOMEM;
171 goto out_ino;
172 }
173 memcpy(ui->data, ino->data, ui->data_len);
174 ((char *)ui->data)[ui->data_len] = '\0';
175 } else if (ui->data_len != 0) {
176 err = 10;
177 goto out_invalid;
178 }
179 break;
180 case S_IFDIR:
181 inode->i_op = &ubifs_dir_inode_operations;
182 inode->i_fop = &ubifs_dir_operations;
183 if (ui->data_len != 0) {
184 err = 11;
185 goto out_invalid;
186 }
187 break;
188 case S_IFLNK:
189 inode->i_op = &ubifs_symlink_inode_operations;
190 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
191 err = 12;
192 goto out_invalid;
193 }
194 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
195 if (!ui->data) {
196 err = -ENOMEM;
197 goto out_ino;
198 }
199 memcpy(ui->data, ino->data, ui->data_len);
200 ((char *)ui->data)[ui->data_len] = '\0';
201 break;
202 case S_IFBLK:
203 case S_IFCHR:
204 {
205 dev_t rdev;
206 union ubifs_dev_desc *dev;
207
208 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
209 if (!ui->data) {
210 err = -ENOMEM;
211 goto out_ino;
212 }
213
214 dev = (union ubifs_dev_desc *)ino->data;
215 if (ui->data_len == sizeof(dev->new))
216 rdev = new_decode_dev(le32_to_cpu(dev->new));
217 else if (ui->data_len == sizeof(dev->huge))
218 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
219 else {
220 err = 13;
221 goto out_invalid;
222 }
223 memcpy(ui->data, ino->data, ui->data_len);
224 inode->i_op = &ubifs_file_inode_operations;
225 init_special_inode(inode, inode->i_mode, rdev);
226 break;
227 }
228 case S_IFSOCK:
229 case S_IFIFO:
230 inode->i_op = &ubifs_file_inode_operations;
231 init_special_inode(inode, inode->i_mode, 0);
232 if (ui->data_len != 0) {
233 err = 14;
234 goto out_invalid;
235 }
236 break;
237 default:
238 err = 15;
239 goto out_invalid;
240 }
241
242 kfree(ino);
243 ubifs_set_inode_flags(inode);
244 unlock_new_inode(inode);
245 return inode;
246
247out_invalid:
248 ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err);
249 ubifs_dump_node(c, ino);
250 ubifs_dump_inode(c, inode);
251 err = -EINVAL;
252out_ino:
253 kfree(ino);
254out:
255 ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err);
256 iget_failed(inode);
257 return ERR_PTR(err);
258}
259
260static struct inode *ubifs_alloc_inode(struct super_block *sb)
261{
262 struct ubifs_inode *ui;
263
264 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
265 if (!ui)
266 return NULL;
267
268 memset((void *)ui + sizeof(struct inode), 0,
269 sizeof(struct ubifs_inode) - sizeof(struct inode));
270 mutex_init(&ui->ui_mutex);
271 spin_lock_init(&ui->ui_lock);
272 return &ui->vfs_inode;
273};
274
275static void ubifs_i_callback(struct rcu_head *head)
276{
277 struct inode *inode = container_of(head, struct inode, i_rcu);
278 struct ubifs_inode *ui = ubifs_inode(inode);
279 kmem_cache_free(ubifs_inode_slab, ui);
280}
281
282static void ubifs_destroy_inode(struct inode *inode)
283{
284 struct ubifs_inode *ui = ubifs_inode(inode);
285
286 kfree(ui->data);
287 call_rcu(&inode->i_rcu, ubifs_i_callback);
288}
289
290
291
292
293static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
294{
295 int err = 0;
296 struct ubifs_info *c = inode->i_sb->s_fs_info;
297 struct ubifs_inode *ui = ubifs_inode(inode);
298
299 ubifs_assert(!ui->xattr);
300 if (is_bad_inode(inode))
301 return 0;
302
303 mutex_lock(&ui->ui_mutex);
304
305
306
307
308
309
310
311 if (!ui->dirty) {
312 mutex_unlock(&ui->ui_mutex);
313 return 0;
314 }
315
316
317
318
319
320 dbg_gen("inode %lu, mode %#x, nlink %u",
321 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
322 if (inode->i_nlink) {
323 err = ubifs_jnl_write_inode(c, inode);
324 if (err)
325 ubifs_err("can't write inode %lu, error %d",
326 inode->i_ino, err);
327 else
328 err = dbg_check_inode_size(c, inode, ui->ui_size);
329 }
330
331 ui->dirty = 0;
332 mutex_unlock(&ui->ui_mutex);
333 ubifs_release_dirty_inode_budget(c, ui);
334 return err;
335}
336
337static void ubifs_evict_inode(struct inode *inode)
338{
339 int err;
340 struct ubifs_info *c = inode->i_sb->s_fs_info;
341 struct ubifs_inode *ui = ubifs_inode(inode);
342
343 if (ui->xattr)
344
345
346
347
348
349 goto out;
350
351 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
352 ubifs_assert(!atomic_read(&inode->i_count));
353
354 truncate_inode_pages(&inode->i_data, 0);
355
356 if (inode->i_nlink)
357 goto done;
358
359 if (is_bad_inode(inode))
360 goto out;
361
362 ui->ui_size = inode->i_size = 0;
363 err = ubifs_jnl_delete_inode(c, inode);
364 if (err)
365
366
367
368
369 ubifs_err("can't delete inode %lu, error %d",
370 inode->i_ino, err);
371
372out:
373 if (ui->dirty)
374 ubifs_release_dirty_inode_budget(c, ui);
375 else {
376
377 c->bi.nospace = c->bi.nospace_rp = 0;
378 smp_wmb();
379 }
380done:
381 clear_inode(inode);
382}
383
384static void ubifs_dirty_inode(struct inode *inode, int flags)
385{
386 struct ubifs_inode *ui = ubifs_inode(inode);
387
388 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
389 if (!ui->dirty) {
390 ui->dirty = 1;
391 dbg_gen("inode %lu", inode->i_ino);
392 }
393}
394
395static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
396{
397 struct ubifs_info *c = dentry->d_sb->s_fs_info;
398 unsigned long long free;
399 __le32 *uuid = (__le32 *)c->uuid;
400
401 free = ubifs_get_free_space(c);
402 dbg_gen("free space %lld bytes (%lld blocks)",
403 free, free >> UBIFS_BLOCK_SHIFT);
404
405 buf->f_type = UBIFS_SUPER_MAGIC;
406 buf->f_bsize = UBIFS_BLOCK_SIZE;
407 buf->f_blocks = c->block_cnt;
408 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
409 if (free > c->report_rp_size)
410 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
411 else
412 buf->f_bavail = 0;
413 buf->f_files = 0;
414 buf->f_ffree = 0;
415 buf->f_namelen = UBIFS_MAX_NLEN;
416 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
417 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
418 ubifs_assert(buf->f_bfree <= c->block_cnt);
419 return 0;
420}
421
422static int ubifs_show_options(struct seq_file *s, struct dentry *root)
423{
424 struct ubifs_info *c = root->d_sb->s_fs_info;
425
426 if (c->mount_opts.unmount_mode == 2)
427 seq_printf(s, ",fast_unmount");
428 else if (c->mount_opts.unmount_mode == 1)
429 seq_printf(s, ",norm_unmount");
430
431 if (c->mount_opts.bulk_read == 2)
432 seq_printf(s, ",bulk_read");
433 else if (c->mount_opts.bulk_read == 1)
434 seq_printf(s, ",no_bulk_read");
435
436 if (c->mount_opts.chk_data_crc == 2)
437 seq_printf(s, ",chk_data_crc");
438 else if (c->mount_opts.chk_data_crc == 1)
439 seq_printf(s, ",no_chk_data_crc");
440
441 if (c->mount_opts.override_compr) {
442 seq_printf(s, ",compr=%s",
443 ubifs_compr_name(c->mount_opts.compr_type));
444 }
445
446 return 0;
447}
448
449static int ubifs_sync_fs(struct super_block *sb, int wait)
450{
451 int i, err;
452 struct ubifs_info *c = sb->s_fs_info;
453
454
455
456
457
458
459 if (!wait)
460 return 0;
461
462
463
464
465
466 for (i = 0; i < c->jhead_cnt; i++) {
467 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
468 if (err)
469 return err;
470 }
471
472
473
474
475
476
477
478
479 err = ubifs_run_commit(c);
480 if (err)
481 return err;
482
483 return ubi_sync(c->vi.ubi_num);
484}
485
486
487
488
489
490
491
492
493
494
495static int init_constants_early(struct ubifs_info *c)
496{
497 if (c->vi.corrupted) {
498 ubifs_warn("UBI volume is corrupted - read-only mode");
499 c->ro_media = 1;
500 }
501
502 if (c->di.ro_mode) {
503 ubifs_msg("read-only UBI device");
504 c->ro_media = 1;
505 }
506
507 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
508 ubifs_msg("static UBI volume - read-only mode");
509 c->ro_media = 1;
510 }
511
512 c->leb_cnt = c->vi.size;
513 c->leb_size = c->vi.usable_leb_size;
514 c->leb_start = c->di.leb_start;
515 c->half_leb_size = c->leb_size / 2;
516 c->min_io_size = c->di.min_io_size;
517 c->min_io_shift = fls(c->min_io_size) - 1;
518 c->max_write_size = c->di.max_write_size;
519 c->max_write_shift = fls(c->max_write_size) - 1;
520
521 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
522 ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
523 c->leb_size, UBIFS_MIN_LEB_SZ);
524 return -EINVAL;
525 }
526
527 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
528 ubifs_err("too few LEBs (%d), min. is %d",
529 c->leb_cnt, UBIFS_MIN_LEB_CNT);
530 return -EINVAL;
531 }
532
533 if (!is_power_of_2(c->min_io_size)) {
534 ubifs_err("bad min. I/O size %d", c->min_io_size);
535 return -EINVAL;
536 }
537
538
539
540
541
542 if (c->max_write_size < c->min_io_size ||
543 c->max_write_size % c->min_io_size ||
544 !is_power_of_2(c->max_write_size)) {
545 ubifs_err("bad write buffer size %d for %d min. I/O unit",
546 c->max_write_size, c->min_io_size);
547 return -EINVAL;
548 }
549
550
551
552
553
554
555 if (c->min_io_size < 8) {
556 c->min_io_size = 8;
557 c->min_io_shift = 3;
558 if (c->max_write_size < c->min_io_size) {
559 c->max_write_size = c->min_io_size;
560 c->max_write_shift = c->min_io_shift;
561 }
562 }
563
564 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
565 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
566
567
568
569
570
571 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
572 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
573 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
574 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
575 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
576 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
577
578 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
579 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
580 c->ranges[UBIFS_ORPH_NODE].min_len =
581 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
582 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
583 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
584 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
585 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
586 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
587 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
588 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
589
590
591
592
593 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
594
595
596
597
598 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
599
600
601
602
603
604 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
605 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
606
607
608
609
610
611
612 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
613
614
615 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
616 if (c->max_bu_buf_len > c->leb_size)
617 c->max_bu_buf_len = c->leb_size;
618 return 0;
619}
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
637{
638 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
639}
640
641
642
643
644
645
646
647
648
649
650static int init_constants_sb(struct ubifs_info *c)
651{
652 int tmp, err;
653 long long tmp64;
654
655 c->main_bytes = (long long)c->main_lebs * c->leb_size;
656 c->max_znode_sz = sizeof(struct ubifs_znode) +
657 c->fanout * sizeof(struct ubifs_zbranch);
658
659 tmp = ubifs_idx_node_sz(c, 1);
660 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
661 c->min_idx_node_sz = ALIGN(tmp, 8);
662
663 tmp = ubifs_idx_node_sz(c, c->fanout);
664 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
665 c->max_idx_node_sz = ALIGN(tmp, 8);
666
667
668 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
669 tmp = ALIGN(tmp, c->min_io_size);
670 if (tmp > c->leb_size) {
671 ubifs_err("too small LEB size %d, at least %d needed",
672 c->leb_size, tmp);
673 return -EINVAL;
674 }
675
676
677
678
679
680 tmp64 = c->max_bud_bytes + c->leb_size - 1;
681 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
682 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
683 tmp /= c->leb_size;
684 tmp += 1;
685 if (c->log_lebs < tmp) {
686 ubifs_err("too small log %d LEBs, required min. %d LEBs",
687 c->log_lebs, tmp);
688 return -EINVAL;
689 }
690
691
692
693
694
695
696
697
698 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
699 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
700 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
701
702
703
704
705
706
707
708
709 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
710
711
712
713
714
715
716
717 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
718 if (c->bg_bud_bytes < tmp64)
719 c->bg_bud_bytes = tmp64;
720 if (c->max_bud_bytes < tmp64 + c->leb_size)
721 c->max_bud_bytes = tmp64 + c->leb_size;
722
723 err = ubifs_calc_lpt_geom(c);
724 if (err)
725 return err;
726
727
728 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
729 return 0;
730}
731
732
733
734
735
736
737
738
739
740static void init_constants_master(struct ubifs_info *c)
741{
742 long long tmp64;
743
744 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
745 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
746
747
748
749
750
751
752
753
754
755
756 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
757 tmp64 *= (long long)c->leb_size - c->leb_overhead;
758 tmp64 = ubifs_reported_space(c, tmp64);
759 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
760}
761
762
763
764
765
766
767
768
769
770
771
772
773static int take_gc_lnum(struct ubifs_info *c)
774{
775 int err;
776
777 if (c->gc_lnum == -1) {
778 ubifs_err("no LEB for GC");
779 return -EINVAL;
780 }
781
782
783 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
784 LPROPS_TAKEN, 0, 0);
785 return err;
786}
787
788
789
790
791
792
793
794
795static int alloc_wbufs(struct ubifs_info *c)
796{
797 int i, err;
798
799 c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead),
800 GFP_KERNEL);
801 if (!c->jheads)
802 return -ENOMEM;
803
804
805 for (i = 0; i < c->jhead_cnt; i++) {
806 INIT_LIST_HEAD(&c->jheads[i].buds_list);
807 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
808 if (err)
809 return err;
810
811 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
812 c->jheads[i].wbuf.jhead = i;
813 c->jheads[i].grouped = 1;
814 }
815
816
817
818
819
820 c->jheads[GCHD].wbuf.no_timer = 1;
821 c->jheads[GCHD].grouped = 0;
822
823 return 0;
824}
825
826
827
828
829
830static void free_wbufs(struct ubifs_info *c)
831{
832 int i;
833
834 if (c->jheads) {
835 for (i = 0; i < c->jhead_cnt; i++) {
836 kfree(c->jheads[i].wbuf.buf);
837 kfree(c->jheads[i].wbuf.inodes);
838 }
839 kfree(c->jheads);
840 c->jheads = NULL;
841 }
842}
843
844
845
846
847
848static void free_orphans(struct ubifs_info *c)
849{
850 struct ubifs_orphan *orph;
851
852 while (c->orph_dnext) {
853 orph = c->orph_dnext;
854 c->orph_dnext = orph->dnext;
855 list_del(&orph->list);
856 kfree(orph);
857 }
858
859 while (!list_empty(&c->orph_list)) {
860 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
861 list_del(&orph->list);
862 kfree(orph);
863 ubifs_err("orphan list not empty at unmount");
864 }
865
866 vfree(c->orph_buf);
867 c->orph_buf = NULL;
868}
869
870
871
872
873
874static void free_buds(struct ubifs_info *c)
875{
876 struct ubifs_bud *bud, *n;
877
878 rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb)
879 kfree(bud);
880}
881
882
883
884
885
886
887
888
889
890
891static int check_volume_empty(struct ubifs_info *c)
892{
893 int lnum, err;
894
895 c->empty = 1;
896 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
897 err = ubifs_is_mapped(c, lnum);
898 if (unlikely(err < 0))
899 return err;
900 if (err == 1) {
901 c->empty = 0;
902 break;
903 }
904
905 cond_resched();
906 }
907
908 return 0;
909}
910
911
912
913
914
915
916
917
918
919
920
921
922
923enum {
924 Opt_fast_unmount,
925 Opt_norm_unmount,
926 Opt_bulk_read,
927 Opt_no_bulk_read,
928 Opt_chk_data_crc,
929 Opt_no_chk_data_crc,
930 Opt_override_compr,
931 Opt_err,
932};
933
934static const match_table_t tokens = {
935 {Opt_fast_unmount, "fast_unmount"},
936 {Opt_norm_unmount, "norm_unmount"},
937 {Opt_bulk_read, "bulk_read"},
938 {Opt_no_bulk_read, "no_bulk_read"},
939 {Opt_chk_data_crc, "chk_data_crc"},
940 {Opt_no_chk_data_crc, "no_chk_data_crc"},
941 {Opt_override_compr, "compr=%s"},
942 {Opt_err, NULL},
943};
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958static int parse_standard_option(const char *option)
959{
960 ubifs_msg("parse %s", option);
961 if (!strcmp(option, "sync"))
962 return MS_SYNCHRONOUS;
963 return 0;
964}
965
966
967
968
969
970
971
972
973
974
975static int ubifs_parse_options(struct ubifs_info *c, char *options,
976 int is_remount)
977{
978 char *p;
979 substring_t args[MAX_OPT_ARGS];
980
981 if (!options)
982 return 0;
983
984 while ((p = strsep(&options, ","))) {
985 int token;
986
987 if (!*p)
988 continue;
989
990 token = match_token(p, tokens, args);
991 switch (token) {
992
993
994
995
996
997 case Opt_fast_unmount:
998 c->mount_opts.unmount_mode = 2;
999 break;
1000 case Opt_norm_unmount:
1001 c->mount_opts.unmount_mode = 1;
1002 break;
1003 case Opt_bulk_read:
1004 c->mount_opts.bulk_read = 2;
1005 c->bulk_read = 1;
1006 break;
1007 case Opt_no_bulk_read:
1008 c->mount_opts.bulk_read = 1;
1009 c->bulk_read = 0;
1010 break;
1011 case Opt_chk_data_crc:
1012 c->mount_opts.chk_data_crc = 2;
1013 c->no_chk_data_crc = 0;
1014 break;
1015 case Opt_no_chk_data_crc:
1016 c->mount_opts.chk_data_crc = 1;
1017 c->no_chk_data_crc = 1;
1018 break;
1019 case Opt_override_compr:
1020 {
1021 char *name = match_strdup(&args[0]);
1022
1023 if (!name)
1024 return -ENOMEM;
1025 if (!strcmp(name, "none"))
1026 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1027 else if (!strcmp(name, "lzo"))
1028 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1029 else if (!strcmp(name, "zlib"))
1030 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1031 else {
1032 ubifs_err("unknown compressor \"%s\"", name);
1033 kfree(name);
1034 return -EINVAL;
1035 }
1036 kfree(name);
1037 c->mount_opts.override_compr = 1;
1038 c->default_compr = c->mount_opts.compr_type;
1039 break;
1040 }
1041 default:
1042 {
1043 unsigned long flag;
1044 struct super_block *sb = c->vfs_sb;
1045
1046 flag = parse_standard_option(p);
1047 if (!flag) {
1048 ubifs_err("unrecognized mount option \"%s\" or missing value",
1049 p);
1050 return -EINVAL;
1051 }
1052 sb->s_flags |= flag;
1053 break;
1054 }
1055 }
1056 }
1057
1058 return 0;
1059}
1060
1061
1062
1063
1064
1065
1066
1067
1068static void destroy_journal(struct ubifs_info *c)
1069{
1070 while (!list_empty(&c->unclean_leb_list)) {
1071 struct ubifs_unclean_leb *ucleb;
1072
1073 ucleb = list_entry(c->unclean_leb_list.next,
1074 struct ubifs_unclean_leb, list);
1075 list_del(&ucleb->list);
1076 kfree(ucleb);
1077 }
1078 while (!list_empty(&c->old_buds)) {
1079 struct ubifs_bud *bud;
1080
1081 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1082 list_del(&bud->list);
1083 kfree(bud);
1084 }
1085 ubifs_destroy_idx_gc(c);
1086 ubifs_destroy_size_tree(c);
1087 ubifs_tnc_close(c);
1088 free_buds(c);
1089}
1090
1091
1092
1093
1094
1095static void bu_init(struct ubifs_info *c)
1096{
1097 ubifs_assert(c->bulk_read == 1);
1098
1099 if (c->bu.buf)
1100 return;
1101
1102again:
1103 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1104 if (!c->bu.buf) {
1105 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1106 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1107 goto again;
1108 }
1109
1110
1111 ubifs_warn("cannot allocate %d bytes of memory for bulk-read, disabling it",
1112 c->max_bu_buf_len);
1113 c->mount_opts.bulk_read = 1;
1114 c->bulk_read = 0;
1115 return;
1116 }
1117}
1118
1119
1120
1121
1122
1123
1124
1125
1126static int check_free_space(struct ubifs_info *c)
1127{
1128 ubifs_assert(c->dark_wm > 0);
1129 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1130 ubifs_err("insufficient free space to mount in R/W mode");
1131 ubifs_dump_budg(c, &c->bi);
1132 ubifs_dump_lprops(c);
1133 return -ENOSPC;
1134 }
1135 return 0;
1136}
1137
1138
1139
1140
1141
1142
1143
1144
1145static int mount_ubifs(struct ubifs_info *c)
1146{
1147 int err;
1148 long long x, y;
1149 size_t sz;
1150
1151 c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
1152 err = init_constants_early(c);
1153 if (err)
1154 return err;
1155
1156 err = ubifs_debugging_init(c);
1157 if (err)
1158 return err;
1159
1160 err = check_volume_empty(c);
1161 if (err)
1162 goto out_free;
1163
1164 if (c->empty && (c->ro_mount || c->ro_media)) {
1165
1166
1167
1168
1169 ubifs_err("can't format empty UBI volume: read-only %s",
1170 c->ro_media ? "UBI volume" : "mount");
1171 err = -EROFS;
1172 goto out_free;
1173 }
1174
1175 if (c->ro_media && !c->ro_mount) {
1176 ubifs_err("cannot mount read-write - read-only media");
1177 err = -EROFS;
1178 goto out_free;
1179 }
1180
1181
1182
1183
1184
1185
1186 err = -ENOMEM;
1187 c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
1188 if (!c->bottom_up_buf)
1189 goto out_free;
1190
1191 c->sbuf = vmalloc(c->leb_size);
1192 if (!c->sbuf)
1193 goto out_free;
1194
1195 if (!c->ro_mount) {
1196 c->ileb_buf = vmalloc(c->leb_size);
1197 if (!c->ileb_buf)
1198 goto out_free;
1199 }
1200
1201 if (c->bulk_read == 1)
1202 bu_init(c);
1203
1204 if (!c->ro_mount) {
1205 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
1206 GFP_KERNEL);
1207 if (!c->write_reserve_buf)
1208 goto out_free;
1209 }
1210
1211 c->mounting = 1;
1212
1213 err = ubifs_read_superblock(c);
1214 if (err)
1215 goto out_free;
1216
1217
1218
1219
1220
1221 if (!ubifs_compr_present(c->default_compr)) {
1222 ubifs_err("'compressor \"%s\" is not compiled in",
1223 ubifs_compr_name(c->default_compr));
1224 err = -ENOTSUPP;
1225 goto out_free;
1226 }
1227
1228 err = init_constants_sb(c);
1229 if (err)
1230 goto out_free;
1231
1232 sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
1233 sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
1234 c->cbuf = kmalloc(sz, GFP_NOFS);
1235 if (!c->cbuf) {
1236 err = -ENOMEM;
1237 goto out_free;
1238 }
1239
1240 err = alloc_wbufs(c);
1241 if (err)
1242 goto out_cbuf;
1243
1244 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
1245 if (!c->ro_mount) {
1246
1247 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1248 if (IS_ERR(c->bgt)) {
1249 err = PTR_ERR(c->bgt);
1250 c->bgt = NULL;
1251 ubifs_err("cannot spawn \"%s\", error %d",
1252 c->bgt_name, err);
1253 goto out_wbufs;
1254 }
1255 wake_up_process(c->bgt);
1256 }
1257
1258 err = ubifs_read_master(c);
1259 if (err)
1260 goto out_master;
1261
1262 init_constants_master(c);
1263
1264 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1265 ubifs_msg("recovery needed");
1266 c->need_recovery = 1;
1267 }
1268
1269 if (c->need_recovery && !c->ro_mount) {
1270 err = ubifs_recover_inl_heads(c, c->sbuf);
1271 if (err)
1272 goto out_master;
1273 }
1274
1275 err = ubifs_lpt_init(c, 1, !c->ro_mount);
1276 if (err)
1277 goto out_master;
1278
1279 if (!c->ro_mount && c->space_fixup) {
1280 err = ubifs_fixup_free_space(c);
1281 if (err)
1282 goto out_lpt;
1283 }
1284
1285 if (!c->ro_mount) {
1286
1287
1288
1289
1290 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1291 err = ubifs_write_master(c);
1292 if (err)
1293 goto out_lpt;
1294 }
1295
1296 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
1297 if (err)
1298 goto out_lpt;
1299
1300 err = ubifs_replay_journal(c);
1301 if (err)
1302 goto out_journal;
1303
1304
1305 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1306
1307 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
1308 if (err)
1309 goto out_orphans;
1310
1311 if (!c->ro_mount) {
1312 int lnum;
1313
1314 err = check_free_space(c);
1315 if (err)
1316 goto out_orphans;
1317
1318
1319 lnum = c->lhead_lnum + 1;
1320 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1321 lnum = UBIFS_LOG_LNUM;
1322 if (lnum == c->ltail_lnum) {
1323 err = ubifs_consolidate_log(c);
1324 if (err)
1325 goto out_orphans;
1326 }
1327
1328 if (c->need_recovery) {
1329 err = ubifs_recover_size(c);
1330 if (err)
1331 goto out_orphans;
1332 err = ubifs_rcvry_gc_commit(c);
1333 if (err)
1334 goto out_orphans;
1335 } else {
1336 err = take_gc_lnum(c);
1337 if (err)
1338 goto out_orphans;
1339
1340
1341
1342
1343
1344 err = ubifs_leb_unmap(c, c->gc_lnum);
1345 if (err)
1346 goto out_orphans;
1347 }
1348
1349 err = dbg_check_lprops(c);
1350 if (err)
1351 goto out_orphans;
1352 } else if (c->need_recovery) {
1353 err = ubifs_recover_size(c);
1354 if (err)
1355 goto out_orphans;
1356 } else {
1357
1358
1359
1360
1361
1362
1363 err = take_gc_lnum(c);
1364 if (err)
1365 goto out_orphans;
1366 }
1367
1368 spin_lock(&ubifs_infos_lock);
1369 list_add_tail(&c->infos_list, &ubifs_infos);
1370 spin_unlock(&ubifs_infos_lock);
1371
1372 if (c->need_recovery) {
1373 if (c->ro_mount)
1374 ubifs_msg("recovery deferred");
1375 else {
1376 c->need_recovery = 0;
1377 ubifs_msg("recovery completed");
1378
1379
1380
1381
1382
1383 ubifs_assert(c->lst.taken_empty_lebs > 0);
1384 }
1385 } else
1386 ubifs_assert(c->lst.taken_empty_lebs > 0);
1387
1388 err = dbg_check_filesystem(c);
1389 if (err)
1390 goto out_infos;
1391
1392 err = dbg_debugfs_init_fs(c);
1393 if (err)
1394 goto out_infos;
1395
1396 c->mounting = 0;
1397
1398 ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"%s",
1399 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1400 c->ro_mount ? ", R/O mode" : "");
1401 x = (long long)c->main_lebs * c->leb_size;
1402 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1403 ubifs_msg("LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1404 c->leb_size, c->leb_size >> 10, c->min_io_size,
1405 c->max_write_size);
1406 ubifs_msg("FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1407 x, x >> 20, c->main_lebs,
1408 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1409 ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
1410 c->report_rp_size, c->report_rp_size >> 10);
1411 ubifs_msg("media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1412 c->fmt_version, c->ro_compat_version,
1413 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1414 c->big_lpt ? ", big LPT model" : ", small LPT model");
1415
1416 dbg_gen("default compressor: %s", ubifs_compr_name(c->default_compr));
1417 dbg_gen("data journal heads: %d",
1418 c->jhead_cnt - NONDATA_JHEADS_CNT);
1419 dbg_gen("log LEBs: %d (%d - %d)",
1420 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1421 dbg_gen("LPT area LEBs: %d (%d - %d)",
1422 c->lpt_lebs, c->lpt_first, c->lpt_last);
1423 dbg_gen("orphan area LEBs: %d (%d - %d)",
1424 c->orph_lebs, c->orph_first, c->orph_last);
1425 dbg_gen("main area LEBs: %d (%d - %d)",
1426 c->main_lebs, c->main_first, c->leb_cnt - 1);
1427 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1428 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1429 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1430 c->bi.old_idx_sz >> 20);
1431 dbg_gen("key hash type: %d", c->key_hash_type);
1432 dbg_gen("tree fanout: %d", c->fanout);
1433 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1434 dbg_gen("max. znode size %d", c->max_znode_sz);
1435 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1436 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1437 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1438 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1439 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1440 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1441 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1442 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1443 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1444 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1445 dbg_gen("dead watermark: %d", c->dead_wm);
1446 dbg_gen("dark watermark: %d", c->dark_wm);
1447 dbg_gen("LEB overhead: %d", c->leb_overhead);
1448 x = (long long)c->main_lebs * c->dark_wm;
1449 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1450 x, x >> 10, x >> 20);
1451 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1452 c->max_bud_bytes, c->max_bud_bytes >> 10,
1453 c->max_bud_bytes >> 20);
1454 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1455 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1456 c->bg_bud_bytes >> 20);
1457 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1458 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1459 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1460 dbg_gen("commit number: %llu", c->cmt_no);
1461
1462 return 0;
1463
1464out_infos:
1465 spin_lock(&ubifs_infos_lock);
1466 list_del(&c->infos_list);
1467 spin_unlock(&ubifs_infos_lock);
1468out_orphans:
1469 free_orphans(c);
1470out_journal:
1471 destroy_journal(c);
1472out_lpt:
1473 ubifs_lpt_free(c, 0);
1474out_master:
1475 kfree(c->mst_node);
1476 kfree(c->rcvrd_mst_node);
1477 if (c->bgt)
1478 kthread_stop(c->bgt);
1479out_wbufs:
1480 free_wbufs(c);
1481out_cbuf:
1482 kfree(c->cbuf);
1483out_free:
1484 kfree(c->write_reserve_buf);
1485 kfree(c->bu.buf);
1486 vfree(c->ileb_buf);
1487 vfree(c->sbuf);
1488 kfree(c->bottom_up_buf);
1489 ubifs_debugging_exit(c);
1490 return err;
1491}
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502static void ubifs_umount(struct ubifs_info *c)
1503{
1504 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1505 c->vi.vol_id);
1506
1507 dbg_debugfs_exit_fs(c);
1508 spin_lock(&ubifs_infos_lock);
1509 list_del(&c->infos_list);
1510 spin_unlock(&ubifs_infos_lock);
1511
1512 if (c->bgt)
1513 kthread_stop(c->bgt);
1514
1515 destroy_journal(c);
1516 free_wbufs(c);
1517 free_orphans(c);
1518 ubifs_lpt_free(c, 0);
1519
1520 kfree(c->cbuf);
1521 kfree(c->rcvrd_mst_node);
1522 kfree(c->mst_node);
1523 kfree(c->write_reserve_buf);
1524 kfree(c->bu.buf);
1525 vfree(c->ileb_buf);
1526 vfree(c->sbuf);
1527 kfree(c->bottom_up_buf);
1528 ubifs_debugging_exit(c);
1529}
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539static int ubifs_remount_rw(struct ubifs_info *c)
1540{
1541 int err, lnum;
1542
1543 if (c->rw_incompat) {
1544 ubifs_err("the file-system is not R/W-compatible");
1545 ubifs_msg("on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1546 c->fmt_version, c->ro_compat_version,
1547 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1548 return -EROFS;
1549 }
1550
1551 mutex_lock(&c->umount_mutex);
1552 dbg_save_space_info(c);
1553 c->remounting_rw = 1;
1554 c->ro_mount = 0;
1555
1556 if (c->space_fixup) {
1557 err = ubifs_fixup_free_space(c);
1558 if (err)
1559 return err;
1560 }
1561
1562 err = check_free_space(c);
1563 if (err)
1564 goto out;
1565
1566 if (c->old_leb_cnt != c->leb_cnt) {
1567 struct ubifs_sb_node *sup;
1568
1569 sup = ubifs_read_sb_node(c);
1570 if (IS_ERR(sup)) {
1571 err = PTR_ERR(sup);
1572 goto out;
1573 }
1574 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1575 err = ubifs_write_sb_node(c, sup);
1576 kfree(sup);
1577 if (err)
1578 goto out;
1579 }
1580
1581 if (c->need_recovery) {
1582 ubifs_msg("completing deferred recovery");
1583 err = ubifs_write_rcvrd_mst_node(c);
1584 if (err)
1585 goto out;
1586 err = ubifs_recover_size(c);
1587 if (err)
1588 goto out;
1589 err = ubifs_clean_lebs(c, c->sbuf);
1590 if (err)
1591 goto out;
1592 err = ubifs_recover_inl_heads(c, c->sbuf);
1593 if (err)
1594 goto out;
1595 } else {
1596
1597 ubifs_assert(c->tot_orphans == 0);
1598 err = ubifs_clear_orphans(c);
1599 if (err)
1600 goto out;
1601 }
1602
1603 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1604 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1605 err = ubifs_write_master(c);
1606 if (err)
1607 goto out;
1608 }
1609
1610 c->ileb_buf = vmalloc(c->leb_size);
1611 if (!c->ileb_buf) {
1612 err = -ENOMEM;
1613 goto out;
1614 }
1615
1616 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
1617 if (!c->write_reserve_buf) {
1618 err = -ENOMEM;
1619 goto out;
1620 }
1621
1622 err = ubifs_lpt_init(c, 0, 1);
1623 if (err)
1624 goto out;
1625
1626
1627 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1628 if (IS_ERR(c->bgt)) {
1629 err = PTR_ERR(c->bgt);
1630 c->bgt = NULL;
1631 ubifs_err("cannot spawn \"%s\", error %d",
1632 c->bgt_name, err);
1633 goto out;
1634 }
1635 wake_up_process(c->bgt);
1636
1637 c->orph_buf = vmalloc(c->leb_size);
1638 if (!c->orph_buf) {
1639 err = -ENOMEM;
1640 goto out;
1641 }
1642
1643
1644 lnum = c->lhead_lnum + 1;
1645 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1646 lnum = UBIFS_LOG_LNUM;
1647 if (lnum == c->ltail_lnum) {
1648 err = ubifs_consolidate_log(c);
1649 if (err)
1650 goto out;
1651 }
1652
1653 if (c->need_recovery)
1654 err = ubifs_rcvry_gc_commit(c);
1655 else
1656 err = ubifs_leb_unmap(c, c->gc_lnum);
1657 if (err)
1658 goto out;
1659
1660 dbg_gen("re-mounted read-write");
1661 c->remounting_rw = 0;
1662
1663 if (c->need_recovery) {
1664 c->need_recovery = 0;
1665 ubifs_msg("deferred recovery completed");
1666 } else {
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677 err = dbg_check_space_info(c);
1678 }
1679
1680 mutex_unlock(&c->umount_mutex);
1681 return err;
1682
1683out:
1684 c->ro_mount = 1;
1685 vfree(c->orph_buf);
1686 c->orph_buf = NULL;
1687 if (c->bgt) {
1688 kthread_stop(c->bgt);
1689 c->bgt = NULL;
1690 }
1691 free_wbufs(c);
1692 kfree(c->write_reserve_buf);
1693 c->write_reserve_buf = NULL;
1694 vfree(c->ileb_buf);
1695 c->ileb_buf = NULL;
1696 ubifs_lpt_free(c, 1);
1697 c->remounting_rw = 0;
1698 mutex_unlock(&c->umount_mutex);
1699 return err;
1700}
1701
1702
1703
1704
1705
1706
1707
1708
1709static void ubifs_remount_ro(struct ubifs_info *c)
1710{
1711 int i, err;
1712
1713 ubifs_assert(!c->need_recovery);
1714 ubifs_assert(!c->ro_mount);
1715
1716 mutex_lock(&c->umount_mutex);
1717 if (c->bgt) {
1718 kthread_stop(c->bgt);
1719 c->bgt = NULL;
1720 }
1721
1722 dbg_save_space_info(c);
1723
1724 for (i = 0; i < c->jhead_cnt; i++)
1725 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1726
1727 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1728 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1729 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1730 err = ubifs_write_master(c);
1731 if (err)
1732 ubifs_ro_mode(c, err);
1733
1734 vfree(c->orph_buf);
1735 c->orph_buf = NULL;
1736 kfree(c->write_reserve_buf);
1737 c->write_reserve_buf = NULL;
1738 vfree(c->ileb_buf);
1739 c->ileb_buf = NULL;
1740 ubifs_lpt_free(c, 1);
1741 c->ro_mount = 1;
1742 err = dbg_check_space_info(c);
1743 if (err)
1744 ubifs_ro_mode(c, err);
1745 mutex_unlock(&c->umount_mutex);
1746}
1747
1748static void ubifs_put_super(struct super_block *sb)
1749{
1750 int i;
1751 struct ubifs_info *c = sb->s_fs_info;
1752
1753 ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num,
1754 c->vi.vol_id);
1755
1756
1757
1758
1759
1760
1761 if (!c->ro_error) {
1762 ubifs_assert(c->bi.idx_growth == 0);
1763 ubifs_assert(c->bi.dd_growth == 0);
1764 ubifs_assert(c->bi.data_growth == 0);
1765 }
1766
1767
1768
1769
1770
1771
1772
1773 mutex_lock(&c->umount_mutex);
1774 if (!c->ro_mount) {
1775
1776
1777
1778
1779 if (c->bgt) {
1780 kthread_stop(c->bgt);
1781 c->bgt = NULL;
1782 }
1783
1784
1785
1786
1787
1788 if (!c->ro_error) {
1789 int err;
1790
1791
1792 for (i = 0; i < c->jhead_cnt; i++)
1793 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1794
1795
1796
1797
1798
1799
1800 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1801 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1802 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1803 err = ubifs_write_master(c);
1804 if (err)
1805
1806
1807
1808
1809
1810 ubifs_err("failed to write master node, error %d",
1811 err);
1812 } else {
1813 for (i = 0; i < c->jhead_cnt; i++)
1814
1815 hrtimer_cancel(&c->jheads[i].wbuf.timer);
1816 }
1817 }
1818
1819 ubifs_umount(c);
1820 bdi_destroy(&c->bdi);
1821 ubi_close_volume(c->ubi);
1822 mutex_unlock(&c->umount_mutex);
1823}
1824
1825static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
1826{
1827 int err;
1828 struct ubifs_info *c = sb->s_fs_info;
1829
1830 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
1831
1832 err = ubifs_parse_options(c, data, 1);
1833 if (err) {
1834 ubifs_err("invalid or unknown remount parameter");
1835 return err;
1836 }
1837
1838 if (c->ro_mount && !(*flags & MS_RDONLY)) {
1839 if (c->ro_error) {
1840 ubifs_msg("cannot re-mount R/W due to prior errors");
1841 return -EROFS;
1842 }
1843 if (c->ro_media) {
1844 ubifs_msg("cannot re-mount R/W - UBI volume is R/O");
1845 return -EROFS;
1846 }
1847 err = ubifs_remount_rw(c);
1848 if (err)
1849 return err;
1850 } else if (!c->ro_mount && (*flags & MS_RDONLY)) {
1851 if (c->ro_error) {
1852 ubifs_msg("cannot re-mount R/O due to prior errors");
1853 return -EROFS;
1854 }
1855 ubifs_remount_ro(c);
1856 }
1857
1858 if (c->bulk_read == 1)
1859 bu_init(c);
1860 else {
1861 dbg_gen("disable bulk-read");
1862 kfree(c->bu.buf);
1863 c->bu.buf = NULL;
1864 }
1865
1866 ubifs_assert(c->lst.taken_empty_lebs > 0);
1867 return 0;
1868}
1869
1870const struct super_operations ubifs_super_operations = {
1871 .alloc_inode = ubifs_alloc_inode,
1872 .destroy_inode = ubifs_destroy_inode,
1873 .put_super = ubifs_put_super,
1874 .write_inode = ubifs_write_inode,
1875 .evict_inode = ubifs_evict_inode,
1876 .statfs = ubifs_statfs,
1877 .dirty_inode = ubifs_dirty_inode,
1878 .remount_fs = ubifs_remount_fs,
1879 .show_options = ubifs_show_options,
1880 .sync_fs = ubifs_sync_fs,
1881};
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902static struct ubi_volume_desc *open_ubi(const char *name, int mode)
1903{
1904 struct ubi_volume_desc *ubi;
1905 int dev, vol;
1906 char *endptr;
1907
1908
1909 ubi = ubi_open_volume_path(name, mode);
1910 if (!IS_ERR(ubi))
1911 return ubi;
1912
1913
1914 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
1915 return ERR_PTR(-EINVAL);
1916
1917
1918 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
1919 return ubi_open_volume_nm(0, name + 4, mode);
1920
1921 if (!isdigit(name[3]))
1922 return ERR_PTR(-EINVAL);
1923
1924 dev = simple_strtoul(name + 3, &endptr, 0);
1925
1926
1927 if (*endptr == '\0')
1928 return ubi_open_volume(0, dev, mode);
1929
1930
1931 if (*endptr == '_' && isdigit(endptr[1])) {
1932 vol = simple_strtoul(endptr + 1, &endptr, 0);
1933 if (*endptr != '\0')
1934 return ERR_PTR(-EINVAL);
1935 return ubi_open_volume(dev, vol, mode);
1936 }
1937
1938
1939 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
1940 return ubi_open_volume_nm(dev, ++endptr, mode);
1941
1942 return ERR_PTR(-EINVAL);
1943}
1944
1945static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
1946{
1947 struct ubifs_info *c;
1948
1949 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
1950 if (c) {
1951 spin_lock_init(&c->cnt_lock);
1952 spin_lock_init(&c->cs_lock);
1953 spin_lock_init(&c->buds_lock);
1954 spin_lock_init(&c->space_lock);
1955 spin_lock_init(&c->orphan_lock);
1956 init_rwsem(&c->commit_sem);
1957 mutex_init(&c->lp_mutex);
1958 mutex_init(&c->tnc_mutex);
1959 mutex_init(&c->log_mutex);
1960 mutex_init(&c->mst_mutex);
1961 mutex_init(&c->umount_mutex);
1962 mutex_init(&c->bu_mutex);
1963 mutex_init(&c->write_reserve_mutex);
1964 init_waitqueue_head(&c->cmt_wq);
1965 c->buds = RB_ROOT;
1966 c->old_idx = RB_ROOT;
1967 c->size_tree = RB_ROOT;
1968 c->orph_tree = RB_ROOT;
1969 INIT_LIST_HEAD(&c->infos_list);
1970 INIT_LIST_HEAD(&c->idx_gc);
1971 INIT_LIST_HEAD(&c->replay_list);
1972 INIT_LIST_HEAD(&c->replay_buds);
1973 INIT_LIST_HEAD(&c->uncat_list);
1974 INIT_LIST_HEAD(&c->empty_list);
1975 INIT_LIST_HEAD(&c->freeable_list);
1976 INIT_LIST_HEAD(&c->frdi_idx_list);
1977 INIT_LIST_HEAD(&c->unclean_leb_list);
1978 INIT_LIST_HEAD(&c->old_buds);
1979 INIT_LIST_HEAD(&c->orph_list);
1980 INIT_LIST_HEAD(&c->orph_new);
1981 c->no_chk_data_crc = 1;
1982
1983 c->highest_inum = UBIFS_FIRST_INO;
1984 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
1985
1986 ubi_get_volume_info(ubi, &c->vi);
1987 ubi_get_device_info(c->vi.ubi_num, &c->di);
1988 }
1989 return c;
1990}
1991
1992static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
1993{
1994 struct ubifs_info *c = sb->s_fs_info;
1995 struct inode *root;
1996 int err;
1997
1998 c->vfs_sb = sb;
1999
2000 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2001 if (IS_ERR(c->ubi)) {
2002 err = PTR_ERR(c->ubi);
2003 goto out;
2004 }
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014 c->bdi.name = "ubifs",
2015 c->bdi.capabilities = BDI_CAP_MAP_COPY;
2016 err = bdi_init(&c->bdi);
2017 if (err)
2018 goto out_close;
2019 err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
2020 c->vi.ubi_num, c->vi.vol_id);
2021 if (err)
2022 goto out_bdi;
2023
2024 err = ubifs_parse_options(c, data, 0);
2025 if (err)
2026 goto out_bdi;
2027
2028 sb->s_bdi = &c->bdi;
2029 sb->s_fs_info = c;
2030 sb->s_magic = UBIFS_SUPER_MAGIC;
2031 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2032 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
2033 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2034 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2035 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2036 sb->s_op = &ubifs_super_operations;
2037
2038 mutex_lock(&c->umount_mutex);
2039 err = mount_ubifs(c);
2040 if (err) {
2041 ubifs_assert(err < 0);
2042 goto out_unlock;
2043 }
2044
2045
2046 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2047 if (IS_ERR(root)) {
2048 err = PTR_ERR(root);
2049 goto out_umount;
2050 }
2051
2052 sb->s_root = d_make_root(root);
2053 if (!sb->s_root) {
2054 err = -ENOMEM;
2055 goto out_umount;
2056 }
2057
2058 mutex_unlock(&c->umount_mutex);
2059 return 0;
2060
2061out_umount:
2062 ubifs_umount(c);
2063out_unlock:
2064 mutex_unlock(&c->umount_mutex);
2065out_bdi:
2066 bdi_destroy(&c->bdi);
2067out_close:
2068 ubi_close_volume(c->ubi);
2069out:
2070 return err;
2071}
2072
2073static int sb_test(struct super_block *sb, void *data)
2074{
2075 struct ubifs_info *c1 = data;
2076 struct ubifs_info *c = sb->s_fs_info;
2077
2078 return c->vi.cdev == c1->vi.cdev;
2079}
2080
2081static int sb_set(struct super_block *sb, void *data)
2082{
2083 sb->s_fs_info = data;
2084 return set_anon_super(sb, NULL);
2085}
2086
2087static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2088 const char *name, void *data)
2089{
2090 struct ubi_volume_desc *ubi;
2091 struct ubifs_info *c;
2092 struct super_block *sb;
2093 int err;
2094
2095 dbg_gen("name %s, flags %#x", name, flags);
2096
2097
2098
2099
2100
2101
2102 ubi = open_ubi(name, UBI_READONLY);
2103 if (IS_ERR(ubi)) {
2104 ubifs_err("cannot open \"%s\", error %d",
2105 name, (int)PTR_ERR(ubi));
2106 return ERR_CAST(ubi);
2107 }
2108
2109 c = alloc_ubifs_info(ubi);
2110 if (!c) {
2111 err = -ENOMEM;
2112 goto out_close;
2113 }
2114
2115 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2116
2117 sb = sget(fs_type, sb_test, sb_set, flags, c);
2118 if (IS_ERR(sb)) {
2119 err = PTR_ERR(sb);
2120 kfree(c);
2121 goto out_close;
2122 }
2123
2124 if (sb->s_root) {
2125 struct ubifs_info *c1 = sb->s_fs_info;
2126 kfree(c);
2127
2128 dbg_gen("this ubi volume is already mounted");
2129 if (!!(flags & MS_RDONLY) != c1->ro_mount) {
2130 err = -EBUSY;
2131 goto out_deact;
2132 }
2133 } else {
2134 err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
2135 if (err)
2136 goto out_deact;
2137
2138 sb->s_flags |= MS_ACTIVE | MS_NOATIME;
2139 }
2140
2141
2142 ubi_close_volume(ubi);
2143
2144 return dget(sb->s_root);
2145
2146out_deact:
2147 deactivate_locked_super(sb);
2148out_close:
2149 ubi_close_volume(ubi);
2150 return ERR_PTR(err);
2151}
2152
2153static void kill_ubifs_super(struct super_block *s)
2154{
2155 struct ubifs_info *c = s->s_fs_info;
2156 kill_anon_super(s);
2157 kfree(c);
2158}
2159
2160static struct file_system_type ubifs_fs_type = {
2161 .name = "ubifs",
2162 .owner = THIS_MODULE,
2163 .mount = ubifs_mount,
2164 .kill_sb = kill_ubifs_super,
2165};
2166MODULE_ALIAS_FS("ubifs");
2167
2168
2169
2170
2171static void inode_slab_ctor(void *obj)
2172{
2173 struct ubifs_inode *ui = obj;
2174 inode_init_once(&ui->vfs_inode);
2175}
2176
2177static int __init ubifs_init(void)
2178{
2179 int err;
2180
2181 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2182
2183
2184 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2185 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2186 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2187 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2188 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2189 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2190 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2191 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2192 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2193 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2194 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2195
2196 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2197 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2198 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2199 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2200 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2201 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2202
2203
2204 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2205 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2206 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2207 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2208
2209 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2210 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2211 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2212 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2213
2214
2215 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2216 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2217 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2218 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2219
2220
2221
2222
2223
2224
2225
2226 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2227
2228
2229
2230
2231
2232 if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
2233 ubifs_err("VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2234 (unsigned int)PAGE_CACHE_SIZE);
2235 return -EINVAL;
2236 }
2237
2238 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2239 sizeof(struct ubifs_inode), 0,
2240 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
2241 &inode_slab_ctor);
2242 if (!ubifs_inode_slab)
2243 return -ENOMEM;
2244
2245 register_shrinker(&ubifs_shrinker_info);
2246
2247 err = ubifs_compressors_init();
2248 if (err)
2249 goto out_shrinker;
2250
2251 err = dbg_debugfs_init();
2252 if (err)
2253 goto out_compr;
2254
2255 err = register_filesystem(&ubifs_fs_type);
2256 if (err) {
2257 ubifs_err("cannot register file system, error %d", err);
2258 goto out_dbg;
2259 }
2260 return 0;
2261
2262out_dbg:
2263 dbg_debugfs_exit();
2264out_compr:
2265 ubifs_compressors_exit();
2266out_shrinker:
2267 unregister_shrinker(&ubifs_shrinker_info);
2268 kmem_cache_destroy(ubifs_inode_slab);
2269 return err;
2270}
2271
2272late_initcall(ubifs_init);
2273
2274static void __exit ubifs_exit(void)
2275{
2276 ubifs_assert(list_empty(&ubifs_infos));
2277 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
2278
2279 dbg_debugfs_exit();
2280 ubifs_compressors_exit();
2281 unregister_shrinker(&ubifs_shrinker_info);
2282
2283
2284
2285
2286
2287 rcu_barrier();
2288 kmem_cache_destroy(ubifs_inode_slab);
2289 unregister_filesystem(&ubifs_fs_type);
2290}
2291module_exit(ubifs_exit);
2292
2293MODULE_LICENSE("GPL");
2294MODULE_VERSION(__stringify(UBIFS_VERSION));
2295MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2296MODULE_DESCRIPTION("UBIFS - UBI File System");
2297