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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(c, "inode is too large (%lld)",
74 (long long)inode->i_size);
75 return 1;
76 }
77
78 if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
79 ubifs_err(c, "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(c, "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;
132#ifndef CONFIG_UBIFS_ATIME_SUPPORT
133 inode->i_flags |= S_NOATIME;
134#endif
135 set_nlink(inode, le32_to_cpu(ino->nlink));
136 i_uid_write(inode, le32_to_cpu(ino->uid));
137 i_gid_write(inode, le32_to_cpu(ino->gid));
138 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
139 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
140 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
141 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
142 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
143 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
144 inode->i_mode = le32_to_cpu(ino->mode);
145 inode->i_size = le64_to_cpu(ino->size);
146
147 ui->data_len = le32_to_cpu(ino->data_len);
148 ui->flags = le32_to_cpu(ino->flags);
149 ui->compr_type = le16_to_cpu(ino->compr_type);
150 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
151 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
152 ui->xattr_size = le32_to_cpu(ino->xattr_size);
153 ui->xattr_names = le32_to_cpu(ino->xattr_names);
154 ui->synced_i_size = ui->ui_size = inode->i_size;
155
156 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
157
158 err = validate_inode(c, inode);
159 if (err)
160 goto out_invalid;
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 inode->i_link = ui->data;
202 break;
203 case S_IFBLK:
204 case S_IFCHR:
205 {
206 dev_t rdev;
207 union ubifs_dev_desc *dev;
208
209 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
210 if (!ui->data) {
211 err = -ENOMEM;
212 goto out_ino;
213 }
214
215 dev = (union ubifs_dev_desc *)ino->data;
216 if (ui->data_len == sizeof(dev->new))
217 rdev = new_decode_dev(le32_to_cpu(dev->new));
218 else if (ui->data_len == sizeof(dev->huge))
219 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
220 else {
221 err = 13;
222 goto out_invalid;
223 }
224 memcpy(ui->data, ino->data, ui->data_len);
225 inode->i_op = &ubifs_file_inode_operations;
226 init_special_inode(inode, inode->i_mode, rdev);
227 break;
228 }
229 case S_IFSOCK:
230 case S_IFIFO:
231 inode->i_op = &ubifs_file_inode_operations;
232 init_special_inode(inode, inode->i_mode, 0);
233 if (ui->data_len != 0) {
234 err = 14;
235 goto out_invalid;
236 }
237 break;
238 default:
239 err = 15;
240 goto out_invalid;
241 }
242
243 kfree(ino);
244 ubifs_set_inode_flags(inode);
245 unlock_new_inode(inode);
246 return inode;
247
248out_invalid:
249 ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err);
250 ubifs_dump_node(c, ino);
251 ubifs_dump_inode(c, inode);
252 err = -EINVAL;
253out_ino:
254 kfree(ino);
255out:
256 ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err);
257 iget_failed(inode);
258 return ERR_PTR(err);
259}
260
261static struct inode *ubifs_alloc_inode(struct super_block *sb)
262{
263 struct ubifs_inode *ui;
264
265 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
266 if (!ui)
267 return NULL;
268
269 memset((void *)ui + sizeof(struct inode), 0,
270 sizeof(struct ubifs_inode) - sizeof(struct inode));
271 mutex_init(&ui->ui_mutex);
272 spin_lock_init(&ui->ui_lock);
273 return &ui->vfs_inode;
274};
275
276static void ubifs_i_callback(struct rcu_head *head)
277{
278 struct inode *inode = container_of(head, struct inode, i_rcu);
279 struct ubifs_inode *ui = ubifs_inode(inode);
280 kmem_cache_free(ubifs_inode_slab, ui);
281}
282
283static void ubifs_destroy_inode(struct inode *inode)
284{
285 struct ubifs_inode *ui = ubifs_inode(inode);
286
287 kfree(ui->data);
288 call_rcu(&inode->i_rcu, ubifs_i_callback);
289}
290
291
292
293
294static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
295{
296 int err = 0;
297 struct ubifs_info *c = inode->i_sb->s_fs_info;
298 struct ubifs_inode *ui = ubifs_inode(inode);
299
300 ubifs_assert(!ui->xattr);
301 if (is_bad_inode(inode))
302 return 0;
303
304 mutex_lock(&ui->ui_mutex);
305
306
307
308
309
310
311
312 if (!ui->dirty) {
313 mutex_unlock(&ui->ui_mutex);
314 return 0;
315 }
316
317
318
319
320
321 dbg_gen("inode %lu, mode %#x, nlink %u",
322 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
323 if (inode->i_nlink) {
324 err = ubifs_jnl_write_inode(c, inode);
325 if (err)
326 ubifs_err(c, "can't write inode %lu, error %d",
327 inode->i_ino, err);
328 else
329 err = dbg_check_inode_size(c, inode, ui->ui_size);
330 }
331
332 ui->dirty = 0;
333 mutex_unlock(&ui->ui_mutex);
334 ubifs_release_dirty_inode_budget(c, ui);
335 return err;
336}
337
338static void ubifs_evict_inode(struct inode *inode)
339{
340 int err;
341 struct ubifs_info *c = inode->i_sb->s_fs_info;
342 struct ubifs_inode *ui = ubifs_inode(inode);
343
344 if (ui->xattr)
345
346
347
348
349
350 goto out;
351
352 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
353 ubifs_assert(!atomic_read(&inode->i_count));
354
355 truncate_inode_pages_final(&inode->i_data);
356
357 if (inode->i_nlink)
358 goto done;
359
360 if (is_bad_inode(inode))
361 goto out;
362
363 ui->ui_size = inode->i_size = 0;
364 err = ubifs_jnl_delete_inode(c, inode);
365 if (err)
366
367
368
369
370 ubifs_err(c, "can't delete inode %lu, error %d",
371 inode->i_ino, err);
372
373out:
374 if (ui->dirty)
375 ubifs_release_dirty_inode_budget(c, ui);
376 else {
377
378 c->bi.nospace = c->bi.nospace_rp = 0;
379 smp_wmb();
380 }
381done:
382 clear_inode(inode);
383}
384
385static void ubifs_dirty_inode(struct inode *inode, int flags)
386{
387 struct ubifs_inode *ui = ubifs_inode(inode);
388
389 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
390 if (!ui->dirty) {
391 ui->dirty = 1;
392 dbg_gen("inode %lu", inode->i_ino);
393 }
394}
395
396static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
397{
398 struct ubifs_info *c = dentry->d_sb->s_fs_info;
399 unsigned long long free;
400 __le32 *uuid = (__le32 *)c->uuid;
401
402 free = ubifs_get_free_space(c);
403 dbg_gen("free space %lld bytes (%lld blocks)",
404 free, free >> UBIFS_BLOCK_SHIFT);
405
406 buf->f_type = UBIFS_SUPER_MAGIC;
407 buf->f_bsize = UBIFS_BLOCK_SIZE;
408 buf->f_blocks = c->block_cnt;
409 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
410 if (free > c->report_rp_size)
411 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
412 else
413 buf->f_bavail = 0;
414 buf->f_files = 0;
415 buf->f_ffree = 0;
416 buf->f_namelen = UBIFS_MAX_NLEN;
417 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
418 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
419 ubifs_assert(buf->f_bfree <= c->block_cnt);
420 return 0;
421}
422
423static int ubifs_show_options(struct seq_file *s, struct dentry *root)
424{
425 struct ubifs_info *c = root->d_sb->s_fs_info;
426
427 if (c->mount_opts.unmount_mode == 2)
428 seq_puts(s, ",fast_unmount");
429 else if (c->mount_opts.unmount_mode == 1)
430 seq_puts(s, ",norm_unmount");
431
432 if (c->mount_opts.bulk_read == 2)
433 seq_puts(s, ",bulk_read");
434 else if (c->mount_opts.bulk_read == 1)
435 seq_puts(s, ",no_bulk_read");
436
437 if (c->mount_opts.chk_data_crc == 2)
438 seq_puts(s, ",chk_data_crc");
439 else if (c->mount_opts.chk_data_crc == 1)
440 seq_puts(s, ",no_chk_data_crc");
441
442 if (c->mount_opts.override_compr) {
443 seq_printf(s, ",compr=%s",
444 ubifs_compr_name(c->mount_opts.compr_type));
445 }
446
447 return 0;
448}
449
450static int ubifs_sync_fs(struct super_block *sb, int wait)
451{
452 int i, err;
453 struct ubifs_info *c = sb->s_fs_info;
454
455
456
457
458
459
460 if (!wait)
461 return 0;
462
463
464
465
466
467 for (i = 0; i < c->jhead_cnt; i++) {
468 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
469 if (err)
470 return err;
471 }
472
473
474
475
476
477
478
479
480 err = ubifs_run_commit(c);
481 if (err)
482 return err;
483
484 return ubi_sync(c->vi.ubi_num);
485}
486
487
488
489
490
491
492
493
494
495
496static int init_constants_early(struct ubifs_info *c)
497{
498 if (c->vi.corrupted) {
499 ubifs_warn(c, "UBI volume is corrupted - read-only mode");
500 c->ro_media = 1;
501 }
502
503 if (c->di.ro_mode) {
504 ubifs_msg(c, "read-only UBI device");
505 c->ro_media = 1;
506 }
507
508 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
509 ubifs_msg(c, "static UBI volume - read-only mode");
510 c->ro_media = 1;
511 }
512
513 c->leb_cnt = c->vi.size;
514 c->leb_size = c->vi.usable_leb_size;
515 c->leb_start = c->di.leb_start;
516 c->half_leb_size = c->leb_size / 2;
517 c->min_io_size = c->di.min_io_size;
518 c->min_io_shift = fls(c->min_io_size) - 1;
519 c->max_write_size = c->di.max_write_size;
520 c->max_write_shift = fls(c->max_write_size) - 1;
521
522 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
523 ubifs_err(c, "too small LEBs (%d bytes), min. is %d bytes",
524 c->leb_size, UBIFS_MIN_LEB_SZ);
525 return -EINVAL;
526 }
527
528 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
529 ubifs_err(c, "too few LEBs (%d), min. is %d",
530 c->leb_cnt, UBIFS_MIN_LEB_CNT);
531 return -EINVAL;
532 }
533
534 if (!is_power_of_2(c->min_io_size)) {
535 ubifs_err(c, "bad min. I/O size %d", c->min_io_size);
536 return -EINVAL;
537 }
538
539
540
541
542
543 if (c->max_write_size < c->min_io_size ||
544 c->max_write_size % c->min_io_size ||
545 !is_power_of_2(c->max_write_size)) {
546 ubifs_err(c, "bad write buffer size %d for %d min. I/O unit",
547 c->max_write_size, c->min_io_size);
548 return -EINVAL;
549 }
550
551
552
553
554
555
556 if (c->min_io_size < 8) {
557 c->min_io_size = 8;
558 c->min_io_shift = 3;
559 if (c->max_write_size < c->min_io_size) {
560 c->max_write_size = c->min_io_size;
561 c->max_write_shift = c->min_io_shift;
562 }
563 }
564
565 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
566 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
567
568
569
570
571
572 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
573 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
574 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
575 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
576 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
577 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
578
579 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
580 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
581 c->ranges[UBIFS_ORPH_NODE].min_len =
582 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
583 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
584 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
585 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
586 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
587 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
588 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
589 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
590
591
592
593
594 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
595
596
597
598
599 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
600
601
602
603
604
605 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
606 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
607
608
609
610
611
612
613 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
614
615
616 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
617 if (c->max_bu_buf_len > c->leb_size)
618 c->max_bu_buf_len = c->leb_size;
619 return 0;
620}
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
638{
639 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
640}
641
642
643
644
645
646
647
648
649
650
651static int init_constants_sb(struct ubifs_info *c)
652{
653 int tmp, err;
654 long long tmp64;
655
656 c->main_bytes = (long long)c->main_lebs * c->leb_size;
657 c->max_znode_sz = sizeof(struct ubifs_znode) +
658 c->fanout * sizeof(struct ubifs_zbranch);
659
660 tmp = ubifs_idx_node_sz(c, 1);
661 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
662 c->min_idx_node_sz = ALIGN(tmp, 8);
663
664 tmp = ubifs_idx_node_sz(c, c->fanout);
665 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
666 c->max_idx_node_sz = ALIGN(tmp, 8);
667
668
669 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
670 tmp = ALIGN(tmp, c->min_io_size);
671 if (tmp > c->leb_size) {
672 ubifs_err(c, "too small LEB size %d, at least %d needed",
673 c->leb_size, tmp);
674 return -EINVAL;
675 }
676
677
678
679
680
681 tmp64 = c->max_bud_bytes + c->leb_size - 1;
682 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
683 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
684 tmp /= c->leb_size;
685 tmp += 1;
686 if (c->log_lebs < tmp) {
687 ubifs_err(c, "too small log %d LEBs, required min. %d LEBs",
688 c->log_lebs, tmp);
689 return -EINVAL;
690 }
691
692
693
694
695
696
697
698
699 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
700 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
701 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
702
703
704
705
706
707
708
709
710 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
711
712
713
714
715
716
717
718 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
719 if (c->bg_bud_bytes < tmp64)
720 c->bg_bud_bytes = tmp64;
721 if (c->max_bud_bytes < tmp64 + c->leb_size)
722 c->max_bud_bytes = tmp64 + c->leb_size;
723
724 err = ubifs_calc_lpt_geom(c);
725 if (err)
726 return err;
727
728
729 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
730 return 0;
731}
732
733
734
735
736
737
738
739
740
741static void init_constants_master(struct ubifs_info *c)
742{
743 long long tmp64;
744
745 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
746 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
747
748
749
750
751
752
753
754
755
756
757 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
758 tmp64 *= (long long)c->leb_size - c->leb_overhead;
759 tmp64 = ubifs_reported_space(c, tmp64);
760 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
761}
762
763
764
765
766
767
768
769
770
771
772
773
774static int take_gc_lnum(struct ubifs_info *c)
775{
776 int err;
777
778 if (c->gc_lnum == -1) {
779 ubifs_err(c, "no LEB for GC");
780 return -EINVAL;
781 }
782
783
784 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
785 LPROPS_TAKEN, 0, 0);
786 return err;
787}
788
789
790
791
792
793
794
795
796static int alloc_wbufs(struct ubifs_info *c)
797{
798 int i, err;
799
800 c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead),
801 GFP_KERNEL);
802 if (!c->jheads)
803 return -ENOMEM;
804
805
806 for (i = 0; i < c->jhead_cnt; i++) {
807 INIT_LIST_HEAD(&c->jheads[i].buds_list);
808 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
809 if (err)
810 return err;
811
812 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
813 c->jheads[i].wbuf.jhead = i;
814 c->jheads[i].grouped = 1;
815 }
816
817
818
819
820
821 c->jheads[GCHD].wbuf.no_timer = 1;
822 c->jheads[GCHD].grouped = 0;
823
824 return 0;
825}
826
827
828
829
830
831static void free_wbufs(struct ubifs_info *c)
832{
833 int i;
834
835 if (c->jheads) {
836 for (i = 0; i < c->jhead_cnt; i++) {
837 kfree(c->jheads[i].wbuf.buf);
838 kfree(c->jheads[i].wbuf.inodes);
839 }
840 kfree(c->jheads);
841 c->jheads = NULL;
842 }
843}
844
845
846
847
848
849static void free_orphans(struct ubifs_info *c)
850{
851 struct ubifs_orphan *orph;
852
853 while (c->orph_dnext) {
854 orph = c->orph_dnext;
855 c->orph_dnext = orph->dnext;
856 list_del(&orph->list);
857 kfree(orph);
858 }
859
860 while (!list_empty(&c->orph_list)) {
861 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
862 list_del(&orph->list);
863 kfree(orph);
864 ubifs_err(c, "orphan list not empty at unmount");
865 }
866
867 vfree(c->orph_buf);
868 c->orph_buf = NULL;
869}
870
871
872
873
874
875static void free_buds(struct ubifs_info *c)
876{
877 struct ubifs_bud *bud, *n;
878
879 rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb)
880 kfree(bud);
881}
882
883
884
885
886
887
888
889
890
891
892static int check_volume_empty(struct ubifs_info *c)
893{
894 int lnum, err;
895
896 c->empty = 1;
897 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
898 err = ubifs_is_mapped(c, lnum);
899 if (unlikely(err < 0))
900 return err;
901 if (err == 1) {
902 c->empty = 0;
903 break;
904 }
905
906 cond_resched();
907 }
908
909 return 0;
910}
911
912
913
914
915
916
917
918
919
920
921
922
923
924enum {
925 Opt_fast_unmount,
926 Opt_norm_unmount,
927 Opt_bulk_read,
928 Opt_no_bulk_read,
929 Opt_chk_data_crc,
930 Opt_no_chk_data_crc,
931 Opt_override_compr,
932 Opt_err,
933};
934
935static const match_table_t tokens = {
936 {Opt_fast_unmount, "fast_unmount"},
937 {Opt_norm_unmount, "norm_unmount"},
938 {Opt_bulk_read, "bulk_read"},
939 {Opt_no_bulk_read, "no_bulk_read"},
940 {Opt_chk_data_crc, "chk_data_crc"},
941 {Opt_no_chk_data_crc, "no_chk_data_crc"},
942 {Opt_override_compr, "compr=%s"},
943 {Opt_err, NULL},
944};
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959static int parse_standard_option(const char *option)
960{
961
962 pr_notice("UBIFS: parse %s\n", option);
963 if (!strcmp(option, "sync"))
964 return MS_SYNCHRONOUS;
965 return 0;
966}
967
968
969
970
971
972
973
974
975
976
977static int ubifs_parse_options(struct ubifs_info *c, char *options,
978 int is_remount)
979{
980 char *p;
981 substring_t args[MAX_OPT_ARGS];
982
983 if (!options)
984 return 0;
985
986 while ((p = strsep(&options, ","))) {
987 int token;
988
989 if (!*p)
990 continue;
991
992 token = match_token(p, tokens, args);
993 switch (token) {
994
995
996
997
998
999 case Opt_fast_unmount:
1000 c->mount_opts.unmount_mode = 2;
1001 break;
1002 case Opt_norm_unmount:
1003 c->mount_opts.unmount_mode = 1;
1004 break;
1005 case Opt_bulk_read:
1006 c->mount_opts.bulk_read = 2;
1007 c->bulk_read = 1;
1008 break;
1009 case Opt_no_bulk_read:
1010 c->mount_opts.bulk_read = 1;
1011 c->bulk_read = 0;
1012 break;
1013 case Opt_chk_data_crc:
1014 c->mount_opts.chk_data_crc = 2;
1015 c->no_chk_data_crc = 0;
1016 break;
1017 case Opt_no_chk_data_crc:
1018 c->mount_opts.chk_data_crc = 1;
1019 c->no_chk_data_crc = 1;
1020 break;
1021 case Opt_override_compr:
1022 {
1023 char *name = match_strdup(&args[0]);
1024
1025 if (!name)
1026 return -ENOMEM;
1027 if (!strcmp(name, "none"))
1028 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1029 else if (!strcmp(name, "lzo"))
1030 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1031 else if (!strcmp(name, "zlib"))
1032 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1033 else {
1034 ubifs_err(c, "unknown compressor \"%s\"", name);
1035 kfree(name);
1036 return -EINVAL;
1037 }
1038 kfree(name);
1039 c->mount_opts.override_compr = 1;
1040 c->default_compr = c->mount_opts.compr_type;
1041 break;
1042 }
1043 default:
1044 {
1045 unsigned long flag;
1046 struct super_block *sb = c->vfs_sb;
1047
1048 flag = parse_standard_option(p);
1049 if (!flag) {
1050 ubifs_err(c, "unrecognized mount option \"%s\" or missing value",
1051 p);
1052 return -EINVAL;
1053 }
1054 sb->s_flags |= flag;
1055 break;
1056 }
1057 }
1058 }
1059
1060 return 0;
1061}
1062
1063
1064
1065
1066
1067
1068
1069
1070static void destroy_journal(struct ubifs_info *c)
1071{
1072 while (!list_empty(&c->unclean_leb_list)) {
1073 struct ubifs_unclean_leb *ucleb;
1074
1075 ucleb = list_entry(c->unclean_leb_list.next,
1076 struct ubifs_unclean_leb, list);
1077 list_del(&ucleb->list);
1078 kfree(ucleb);
1079 }
1080 while (!list_empty(&c->old_buds)) {
1081 struct ubifs_bud *bud;
1082
1083 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1084 list_del(&bud->list);
1085 kfree(bud);
1086 }
1087 ubifs_destroy_idx_gc(c);
1088 ubifs_destroy_size_tree(c);
1089 ubifs_tnc_close(c);
1090 free_buds(c);
1091}
1092
1093
1094
1095
1096
1097static void bu_init(struct ubifs_info *c)
1098{
1099 ubifs_assert(c->bulk_read == 1);
1100
1101 if (c->bu.buf)
1102 return;
1103
1104again:
1105 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1106 if (!c->bu.buf) {
1107 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1108 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1109 goto again;
1110 }
1111
1112
1113 ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it",
1114 c->max_bu_buf_len);
1115 c->mount_opts.bulk_read = 1;
1116 c->bulk_read = 0;
1117 return;
1118 }
1119}
1120
1121
1122
1123
1124
1125
1126
1127
1128static int check_free_space(struct ubifs_info *c)
1129{
1130 ubifs_assert(c->dark_wm > 0);
1131 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1132 ubifs_err(c, "insufficient free space to mount in R/W mode");
1133 ubifs_dump_budg(c, &c->bi);
1134 ubifs_dump_lprops(c);
1135 return -ENOSPC;
1136 }
1137 return 0;
1138}
1139
1140
1141
1142
1143
1144
1145
1146
1147static int mount_ubifs(struct ubifs_info *c)
1148{
1149 int err;
1150 long long x, y;
1151 size_t sz;
1152
1153 c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
1154
1155 c->probing = !!(c->vfs_sb->s_flags & MS_SILENT);
1156
1157 err = init_constants_early(c);
1158 if (err)
1159 return err;
1160
1161 err = ubifs_debugging_init(c);
1162 if (err)
1163 return err;
1164
1165 err = check_volume_empty(c);
1166 if (err)
1167 goto out_free;
1168
1169 if (c->empty && (c->ro_mount || c->ro_media)) {
1170
1171
1172
1173
1174 ubifs_err(c, "can't format empty UBI volume: read-only %s",
1175 c->ro_media ? "UBI volume" : "mount");
1176 err = -EROFS;
1177 goto out_free;
1178 }
1179
1180 if (c->ro_media && !c->ro_mount) {
1181 ubifs_err(c, "cannot mount read-write - read-only media");
1182 err = -EROFS;
1183 goto out_free;
1184 }
1185
1186
1187
1188
1189
1190
1191 err = -ENOMEM;
1192 c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
1193 if (!c->bottom_up_buf)
1194 goto out_free;
1195
1196 c->sbuf = vmalloc(c->leb_size);
1197 if (!c->sbuf)
1198 goto out_free;
1199
1200 if (!c->ro_mount) {
1201 c->ileb_buf = vmalloc(c->leb_size);
1202 if (!c->ileb_buf)
1203 goto out_free;
1204 }
1205
1206 if (c->bulk_read == 1)
1207 bu_init(c);
1208
1209 if (!c->ro_mount) {
1210 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
1211 GFP_KERNEL);
1212 if (!c->write_reserve_buf)
1213 goto out_free;
1214 }
1215
1216 c->mounting = 1;
1217
1218 err = ubifs_read_superblock(c);
1219 if (err)
1220 goto out_free;
1221
1222 c->probing = 0;
1223
1224
1225
1226
1227
1228 if (!ubifs_compr_present(c->default_compr)) {
1229 ubifs_err(c, "'compressor \"%s\" is not compiled in",
1230 ubifs_compr_name(c->default_compr));
1231 err = -ENOTSUPP;
1232 goto out_free;
1233 }
1234
1235 err = init_constants_sb(c);
1236 if (err)
1237 goto out_free;
1238
1239 sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
1240 sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
1241 c->cbuf = kmalloc(sz, GFP_NOFS);
1242 if (!c->cbuf) {
1243 err = -ENOMEM;
1244 goto out_free;
1245 }
1246
1247 err = alloc_wbufs(c);
1248 if (err)
1249 goto out_cbuf;
1250
1251 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
1252 if (!c->ro_mount) {
1253
1254 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1255 if (IS_ERR(c->bgt)) {
1256 err = PTR_ERR(c->bgt);
1257 c->bgt = NULL;
1258 ubifs_err(c, "cannot spawn \"%s\", error %d",
1259 c->bgt_name, err);
1260 goto out_wbufs;
1261 }
1262 wake_up_process(c->bgt);
1263 }
1264
1265 err = ubifs_read_master(c);
1266 if (err)
1267 goto out_master;
1268
1269 init_constants_master(c);
1270
1271 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1272 ubifs_msg(c, "recovery needed");
1273 c->need_recovery = 1;
1274 }
1275
1276 if (c->need_recovery && !c->ro_mount) {
1277 err = ubifs_recover_inl_heads(c, c->sbuf);
1278 if (err)
1279 goto out_master;
1280 }
1281
1282 err = ubifs_lpt_init(c, 1, !c->ro_mount);
1283 if (err)
1284 goto out_master;
1285
1286 if (!c->ro_mount && c->space_fixup) {
1287 err = ubifs_fixup_free_space(c);
1288 if (err)
1289 goto out_lpt;
1290 }
1291
1292 if (!c->ro_mount && !c->need_recovery) {
1293
1294
1295
1296
1297 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1298 err = ubifs_write_master(c);
1299 if (err)
1300 goto out_lpt;
1301 }
1302
1303 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
1304 if (err)
1305 goto out_lpt;
1306
1307 err = ubifs_replay_journal(c);
1308 if (err)
1309 goto out_journal;
1310
1311
1312 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1313
1314 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
1315 if (err)
1316 goto out_orphans;
1317
1318 if (!c->ro_mount) {
1319 int lnum;
1320
1321 err = check_free_space(c);
1322 if (err)
1323 goto out_orphans;
1324
1325
1326 lnum = c->lhead_lnum + 1;
1327 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1328 lnum = UBIFS_LOG_LNUM;
1329 if (lnum == c->ltail_lnum) {
1330 err = ubifs_consolidate_log(c);
1331 if (err)
1332 goto out_orphans;
1333 }
1334
1335 if (c->need_recovery) {
1336 err = ubifs_recover_size(c);
1337 if (err)
1338 goto out_orphans;
1339 err = ubifs_rcvry_gc_commit(c);
1340 if (err)
1341 goto out_orphans;
1342 } else {
1343 err = take_gc_lnum(c);
1344 if (err)
1345 goto out_orphans;
1346
1347
1348
1349
1350
1351 err = ubifs_leb_unmap(c, c->gc_lnum);
1352 if (err)
1353 goto out_orphans;
1354 }
1355
1356 err = dbg_check_lprops(c);
1357 if (err)
1358 goto out_orphans;
1359 } else if (c->need_recovery) {
1360 err = ubifs_recover_size(c);
1361 if (err)
1362 goto out_orphans;
1363 } else {
1364
1365
1366
1367
1368
1369
1370 err = take_gc_lnum(c);
1371 if (err)
1372 goto out_orphans;
1373 }
1374
1375 spin_lock(&ubifs_infos_lock);
1376 list_add_tail(&c->infos_list, &ubifs_infos);
1377 spin_unlock(&ubifs_infos_lock);
1378
1379 if (c->need_recovery) {
1380 if (c->ro_mount)
1381 ubifs_msg(c, "recovery deferred");
1382 else {
1383 c->need_recovery = 0;
1384 ubifs_msg(c, "recovery completed");
1385
1386
1387
1388
1389
1390 ubifs_assert(c->lst.taken_empty_lebs > 0);
1391 }
1392 } else
1393 ubifs_assert(c->lst.taken_empty_lebs > 0);
1394
1395 err = dbg_check_filesystem(c);
1396 if (err)
1397 goto out_infos;
1398
1399 err = dbg_debugfs_init_fs(c);
1400 if (err)
1401 goto out_infos;
1402
1403 c->mounting = 0;
1404
1405 ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
1406 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1407 c->ro_mount ? ", R/O mode" : "");
1408 x = (long long)c->main_lebs * c->leb_size;
1409 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1410 ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1411 c->leb_size, c->leb_size >> 10, c->min_io_size,
1412 c->max_write_size);
1413 ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1414 x, x >> 20, c->main_lebs,
1415 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1416 ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)",
1417 c->report_rp_size, c->report_rp_size >> 10);
1418 ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1419 c->fmt_version, c->ro_compat_version,
1420 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1421 c->big_lpt ? ", big LPT model" : ", small LPT model");
1422
1423 dbg_gen("default compressor: %s", ubifs_compr_name(c->default_compr));
1424 dbg_gen("data journal heads: %d",
1425 c->jhead_cnt - NONDATA_JHEADS_CNT);
1426 dbg_gen("log LEBs: %d (%d - %d)",
1427 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1428 dbg_gen("LPT area LEBs: %d (%d - %d)",
1429 c->lpt_lebs, c->lpt_first, c->lpt_last);
1430 dbg_gen("orphan area LEBs: %d (%d - %d)",
1431 c->orph_lebs, c->orph_first, c->orph_last);
1432 dbg_gen("main area LEBs: %d (%d - %d)",
1433 c->main_lebs, c->main_first, c->leb_cnt - 1);
1434 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1435 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1436 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1437 c->bi.old_idx_sz >> 20);
1438 dbg_gen("key hash type: %d", c->key_hash_type);
1439 dbg_gen("tree fanout: %d", c->fanout);
1440 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1441 dbg_gen("max. znode size %d", c->max_znode_sz);
1442 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1443 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1444 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1445 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1446 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1447 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1448 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1449 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1450 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1451 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1452 dbg_gen("dead watermark: %d", c->dead_wm);
1453 dbg_gen("dark watermark: %d", c->dark_wm);
1454 dbg_gen("LEB overhead: %d", c->leb_overhead);
1455 x = (long long)c->main_lebs * c->dark_wm;
1456 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1457 x, x >> 10, x >> 20);
1458 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1459 c->max_bud_bytes, c->max_bud_bytes >> 10,
1460 c->max_bud_bytes >> 20);
1461 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1462 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1463 c->bg_bud_bytes >> 20);
1464 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1465 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1466 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1467 dbg_gen("commit number: %llu", c->cmt_no);
1468
1469 return 0;
1470
1471out_infos:
1472 spin_lock(&ubifs_infos_lock);
1473 list_del(&c->infos_list);
1474 spin_unlock(&ubifs_infos_lock);
1475out_orphans:
1476 free_orphans(c);
1477out_journal:
1478 destroy_journal(c);
1479out_lpt:
1480 ubifs_lpt_free(c, 0);
1481out_master:
1482 kfree(c->mst_node);
1483 kfree(c->rcvrd_mst_node);
1484 if (c->bgt)
1485 kthread_stop(c->bgt);
1486out_wbufs:
1487 free_wbufs(c);
1488out_cbuf:
1489 kfree(c->cbuf);
1490out_free:
1491 kfree(c->write_reserve_buf);
1492 kfree(c->bu.buf);
1493 vfree(c->ileb_buf);
1494 vfree(c->sbuf);
1495 kfree(c->bottom_up_buf);
1496 ubifs_debugging_exit(c);
1497 return err;
1498}
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509static void ubifs_umount(struct ubifs_info *c)
1510{
1511 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1512 c->vi.vol_id);
1513
1514 dbg_debugfs_exit_fs(c);
1515 spin_lock(&ubifs_infos_lock);
1516 list_del(&c->infos_list);
1517 spin_unlock(&ubifs_infos_lock);
1518
1519 if (c->bgt)
1520 kthread_stop(c->bgt);
1521
1522 destroy_journal(c);
1523 free_wbufs(c);
1524 free_orphans(c);
1525 ubifs_lpt_free(c, 0);
1526
1527 kfree(c->cbuf);
1528 kfree(c->rcvrd_mst_node);
1529 kfree(c->mst_node);
1530 kfree(c->write_reserve_buf);
1531 kfree(c->bu.buf);
1532 vfree(c->ileb_buf);
1533 vfree(c->sbuf);
1534 kfree(c->bottom_up_buf);
1535 ubifs_debugging_exit(c);
1536}
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546static int ubifs_remount_rw(struct ubifs_info *c)
1547{
1548 int err, lnum;
1549
1550 if (c->rw_incompat) {
1551 ubifs_err(c, "the file-system is not R/W-compatible");
1552 ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1553 c->fmt_version, c->ro_compat_version,
1554 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1555 return -EROFS;
1556 }
1557
1558 mutex_lock(&c->umount_mutex);
1559 dbg_save_space_info(c);
1560 c->remounting_rw = 1;
1561 c->ro_mount = 0;
1562
1563 if (c->space_fixup) {
1564 err = ubifs_fixup_free_space(c);
1565 if (err)
1566 goto out;
1567 }
1568
1569 err = check_free_space(c);
1570 if (err)
1571 goto out;
1572
1573 if (c->old_leb_cnt != c->leb_cnt) {
1574 struct ubifs_sb_node *sup;
1575
1576 sup = ubifs_read_sb_node(c);
1577 if (IS_ERR(sup)) {
1578 err = PTR_ERR(sup);
1579 goto out;
1580 }
1581 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1582 err = ubifs_write_sb_node(c, sup);
1583 kfree(sup);
1584 if (err)
1585 goto out;
1586 }
1587
1588 if (c->need_recovery) {
1589 ubifs_msg(c, "completing deferred recovery");
1590 err = ubifs_write_rcvrd_mst_node(c);
1591 if (err)
1592 goto out;
1593 err = ubifs_recover_size(c);
1594 if (err)
1595 goto out;
1596 err = ubifs_clean_lebs(c, c->sbuf);
1597 if (err)
1598 goto out;
1599 err = ubifs_recover_inl_heads(c, c->sbuf);
1600 if (err)
1601 goto out;
1602 } else {
1603
1604 ubifs_assert(c->tot_orphans == 0);
1605 err = ubifs_clear_orphans(c);
1606 if (err)
1607 goto out;
1608 }
1609
1610 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1611 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1612 err = ubifs_write_master(c);
1613 if (err)
1614 goto out;
1615 }
1616
1617 c->ileb_buf = vmalloc(c->leb_size);
1618 if (!c->ileb_buf) {
1619 err = -ENOMEM;
1620 goto out;
1621 }
1622
1623 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
1624 if (!c->write_reserve_buf) {
1625 err = -ENOMEM;
1626 goto out;
1627 }
1628
1629 err = ubifs_lpt_init(c, 0, 1);
1630 if (err)
1631 goto out;
1632
1633
1634 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1635 if (IS_ERR(c->bgt)) {
1636 err = PTR_ERR(c->bgt);
1637 c->bgt = NULL;
1638 ubifs_err(c, "cannot spawn \"%s\", error %d",
1639 c->bgt_name, err);
1640 goto out;
1641 }
1642 wake_up_process(c->bgt);
1643
1644 c->orph_buf = vmalloc(c->leb_size);
1645 if (!c->orph_buf) {
1646 err = -ENOMEM;
1647 goto out;
1648 }
1649
1650
1651 lnum = c->lhead_lnum + 1;
1652 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1653 lnum = UBIFS_LOG_LNUM;
1654 if (lnum == c->ltail_lnum) {
1655 err = ubifs_consolidate_log(c);
1656 if (err)
1657 goto out;
1658 }
1659
1660 if (c->need_recovery)
1661 err = ubifs_rcvry_gc_commit(c);
1662 else
1663 err = ubifs_leb_unmap(c, c->gc_lnum);
1664 if (err)
1665 goto out;
1666
1667 dbg_gen("re-mounted read-write");
1668 c->remounting_rw = 0;
1669
1670 if (c->need_recovery) {
1671 c->need_recovery = 0;
1672 ubifs_msg(c, "deferred recovery completed");
1673 } else {
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684 err = dbg_check_space_info(c);
1685 }
1686
1687 mutex_unlock(&c->umount_mutex);
1688 return err;
1689
1690out:
1691 c->ro_mount = 1;
1692 vfree(c->orph_buf);
1693 c->orph_buf = NULL;
1694 if (c->bgt) {
1695 kthread_stop(c->bgt);
1696 c->bgt = NULL;
1697 }
1698 free_wbufs(c);
1699 kfree(c->write_reserve_buf);
1700 c->write_reserve_buf = NULL;
1701 vfree(c->ileb_buf);
1702 c->ileb_buf = NULL;
1703 ubifs_lpt_free(c, 1);
1704 c->remounting_rw = 0;
1705 mutex_unlock(&c->umount_mutex);
1706 return err;
1707}
1708
1709
1710
1711
1712
1713
1714
1715
1716static void ubifs_remount_ro(struct ubifs_info *c)
1717{
1718 int i, err;
1719
1720 ubifs_assert(!c->need_recovery);
1721 ubifs_assert(!c->ro_mount);
1722
1723 mutex_lock(&c->umount_mutex);
1724 if (c->bgt) {
1725 kthread_stop(c->bgt);
1726 c->bgt = NULL;
1727 }
1728
1729 dbg_save_space_info(c);
1730
1731 for (i = 0; i < c->jhead_cnt; i++)
1732 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1733
1734 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1735 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1736 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1737 err = ubifs_write_master(c);
1738 if (err)
1739 ubifs_ro_mode(c, err);
1740
1741 vfree(c->orph_buf);
1742 c->orph_buf = NULL;
1743 kfree(c->write_reserve_buf);
1744 c->write_reserve_buf = NULL;
1745 vfree(c->ileb_buf);
1746 c->ileb_buf = NULL;
1747 ubifs_lpt_free(c, 1);
1748 c->ro_mount = 1;
1749 err = dbg_check_space_info(c);
1750 if (err)
1751 ubifs_ro_mode(c, err);
1752 mutex_unlock(&c->umount_mutex);
1753}
1754
1755static void ubifs_put_super(struct super_block *sb)
1756{
1757 int i;
1758 struct ubifs_info *c = sb->s_fs_info;
1759
1760 ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num);
1761
1762
1763
1764
1765
1766
1767 if (!c->ro_error) {
1768 ubifs_assert(c->bi.idx_growth == 0);
1769 ubifs_assert(c->bi.dd_growth == 0);
1770 ubifs_assert(c->bi.data_growth == 0);
1771 }
1772
1773
1774
1775
1776
1777
1778
1779 mutex_lock(&c->umount_mutex);
1780 if (!c->ro_mount) {
1781
1782
1783
1784
1785 if (c->bgt) {
1786 kthread_stop(c->bgt);
1787 c->bgt = NULL;
1788 }
1789
1790
1791
1792
1793
1794 if (!c->ro_error) {
1795 int err;
1796
1797
1798 for (i = 0; i < c->jhead_cnt; i++)
1799 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1800
1801
1802
1803
1804
1805
1806 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1807 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1808 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1809 err = ubifs_write_master(c);
1810 if (err)
1811
1812
1813
1814
1815
1816 ubifs_err(c, "failed to write master node, error %d",
1817 err);
1818 } else {
1819 for (i = 0; i < c->jhead_cnt; i++)
1820
1821 hrtimer_cancel(&c->jheads[i].wbuf.timer);
1822 }
1823 }
1824
1825 ubifs_umount(c);
1826 bdi_destroy(&c->bdi);
1827 ubi_close_volume(c->ubi);
1828 mutex_unlock(&c->umount_mutex);
1829}
1830
1831static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
1832{
1833 int err;
1834 struct ubifs_info *c = sb->s_fs_info;
1835
1836 sync_filesystem(sb);
1837 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
1838
1839 err = ubifs_parse_options(c, data, 1);
1840 if (err) {
1841 ubifs_err(c, "invalid or unknown remount parameter");
1842 return err;
1843 }
1844
1845 if (c->ro_mount && !(*flags & MS_RDONLY)) {
1846 if (c->ro_error) {
1847 ubifs_msg(c, "cannot re-mount R/W due to prior errors");
1848 return -EROFS;
1849 }
1850 if (c->ro_media) {
1851 ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O");
1852 return -EROFS;
1853 }
1854 err = ubifs_remount_rw(c);
1855 if (err)
1856 return err;
1857 } else if (!c->ro_mount && (*flags & MS_RDONLY)) {
1858 if (c->ro_error) {
1859 ubifs_msg(c, "cannot re-mount R/O due to prior errors");
1860 return -EROFS;
1861 }
1862 ubifs_remount_ro(c);
1863 }
1864
1865 if (c->bulk_read == 1)
1866 bu_init(c);
1867 else {
1868 dbg_gen("disable bulk-read");
1869 kfree(c->bu.buf);
1870 c->bu.buf = NULL;
1871 }
1872
1873 ubifs_assert(c->lst.taken_empty_lebs > 0);
1874 return 0;
1875}
1876
1877const struct super_operations ubifs_super_operations = {
1878 .alloc_inode = ubifs_alloc_inode,
1879 .destroy_inode = ubifs_destroy_inode,
1880 .put_super = ubifs_put_super,
1881 .write_inode = ubifs_write_inode,
1882 .evict_inode = ubifs_evict_inode,
1883 .statfs = ubifs_statfs,
1884 .dirty_inode = ubifs_dirty_inode,
1885 .remount_fs = ubifs_remount_fs,
1886 .show_options = ubifs_show_options,
1887 .sync_fs = ubifs_sync_fs,
1888};
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909static struct ubi_volume_desc *open_ubi(const char *name, int mode)
1910{
1911 struct ubi_volume_desc *ubi;
1912 int dev, vol;
1913 char *endptr;
1914
1915
1916 ubi = ubi_open_volume_path(name, mode);
1917 if (!IS_ERR(ubi))
1918 return ubi;
1919
1920
1921 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
1922 return ERR_PTR(-EINVAL);
1923
1924
1925 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
1926 return ubi_open_volume_nm(0, name + 4, mode);
1927
1928 if (!isdigit(name[3]))
1929 return ERR_PTR(-EINVAL);
1930
1931 dev = simple_strtoul(name + 3, &endptr, 0);
1932
1933
1934 if (*endptr == '\0')
1935 return ubi_open_volume(0, dev, mode);
1936
1937
1938 if (*endptr == '_' && isdigit(endptr[1])) {
1939 vol = simple_strtoul(endptr + 1, &endptr, 0);
1940 if (*endptr != '\0')
1941 return ERR_PTR(-EINVAL);
1942 return ubi_open_volume(dev, vol, mode);
1943 }
1944
1945
1946 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
1947 return ubi_open_volume_nm(dev, ++endptr, mode);
1948
1949 return ERR_PTR(-EINVAL);
1950}
1951
1952static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
1953{
1954 struct ubifs_info *c;
1955
1956 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
1957 if (c) {
1958 spin_lock_init(&c->cnt_lock);
1959 spin_lock_init(&c->cs_lock);
1960 spin_lock_init(&c->buds_lock);
1961 spin_lock_init(&c->space_lock);
1962 spin_lock_init(&c->orphan_lock);
1963 init_rwsem(&c->commit_sem);
1964 mutex_init(&c->lp_mutex);
1965 mutex_init(&c->tnc_mutex);
1966 mutex_init(&c->log_mutex);
1967 mutex_init(&c->umount_mutex);
1968 mutex_init(&c->bu_mutex);
1969 mutex_init(&c->write_reserve_mutex);
1970 init_waitqueue_head(&c->cmt_wq);
1971 c->buds = RB_ROOT;
1972 c->old_idx = RB_ROOT;
1973 c->size_tree = RB_ROOT;
1974 c->orph_tree = RB_ROOT;
1975 INIT_LIST_HEAD(&c->infos_list);
1976 INIT_LIST_HEAD(&c->idx_gc);
1977 INIT_LIST_HEAD(&c->replay_list);
1978 INIT_LIST_HEAD(&c->replay_buds);
1979 INIT_LIST_HEAD(&c->uncat_list);
1980 INIT_LIST_HEAD(&c->empty_list);
1981 INIT_LIST_HEAD(&c->freeable_list);
1982 INIT_LIST_HEAD(&c->frdi_idx_list);
1983 INIT_LIST_HEAD(&c->unclean_leb_list);
1984 INIT_LIST_HEAD(&c->old_buds);
1985 INIT_LIST_HEAD(&c->orph_list);
1986 INIT_LIST_HEAD(&c->orph_new);
1987 c->no_chk_data_crc = 1;
1988
1989 c->highest_inum = UBIFS_FIRST_INO;
1990 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
1991
1992 ubi_get_volume_info(ubi, &c->vi);
1993 ubi_get_device_info(c->vi.ubi_num, &c->di);
1994 }
1995 return c;
1996}
1997
1998static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
1999{
2000 struct ubifs_info *c = sb->s_fs_info;
2001 struct inode *root;
2002 int err;
2003
2004 c->vfs_sb = sb;
2005
2006 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2007 if (IS_ERR(c->ubi)) {
2008 err = PTR_ERR(c->ubi);
2009 goto out;
2010 }
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020 c->bdi.name = "ubifs",
2021 c->bdi.capabilities = 0;
2022 err = bdi_init(&c->bdi);
2023 if (err)
2024 goto out_close;
2025 err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
2026 c->vi.ubi_num, c->vi.vol_id);
2027 if (err)
2028 goto out_bdi;
2029
2030 err = ubifs_parse_options(c, data, 0);
2031 if (err)
2032 goto out_bdi;
2033
2034 sb->s_bdi = &c->bdi;
2035 sb->s_fs_info = c;
2036 sb->s_magic = UBIFS_SUPER_MAGIC;
2037 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2038 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
2039 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2040 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2041 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2042 sb->s_op = &ubifs_super_operations;
2043
2044 mutex_lock(&c->umount_mutex);
2045 err = mount_ubifs(c);
2046 if (err) {
2047 ubifs_assert(err < 0);
2048 goto out_unlock;
2049 }
2050
2051
2052 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2053 if (IS_ERR(root)) {
2054 err = PTR_ERR(root);
2055 goto out_umount;
2056 }
2057
2058 sb->s_root = d_make_root(root);
2059 if (!sb->s_root) {
2060 err = -ENOMEM;
2061 goto out_umount;
2062 }
2063
2064 mutex_unlock(&c->umount_mutex);
2065 return 0;
2066
2067out_umount:
2068 ubifs_umount(c);
2069out_unlock:
2070 mutex_unlock(&c->umount_mutex);
2071out_bdi:
2072 bdi_destroy(&c->bdi);
2073out_close:
2074 ubi_close_volume(c->ubi);
2075out:
2076 return err;
2077}
2078
2079static int sb_test(struct super_block *sb, void *data)
2080{
2081 struct ubifs_info *c1 = data;
2082 struct ubifs_info *c = sb->s_fs_info;
2083
2084 return c->vi.cdev == c1->vi.cdev;
2085}
2086
2087static int sb_set(struct super_block *sb, void *data)
2088{
2089 sb->s_fs_info = data;
2090 return set_anon_super(sb, NULL);
2091}
2092
2093static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2094 const char *name, void *data)
2095{
2096 struct ubi_volume_desc *ubi;
2097 struct ubifs_info *c;
2098 struct super_block *sb;
2099 int err;
2100
2101 dbg_gen("name %s, flags %#x", name, flags);
2102
2103
2104
2105
2106
2107
2108 ubi = open_ubi(name, UBI_READONLY);
2109 if (IS_ERR(ubi)) {
2110 pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
2111 current->pid, name, (int)PTR_ERR(ubi));
2112 return ERR_CAST(ubi);
2113 }
2114
2115 c = alloc_ubifs_info(ubi);
2116 if (!c) {
2117 err = -ENOMEM;
2118 goto out_close;
2119 }
2120
2121 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2122
2123 sb = sget(fs_type, sb_test, sb_set, flags, c);
2124 if (IS_ERR(sb)) {
2125 err = PTR_ERR(sb);
2126 kfree(c);
2127 goto out_close;
2128 }
2129
2130 if (sb->s_root) {
2131 struct ubifs_info *c1 = sb->s_fs_info;
2132 kfree(c);
2133
2134 dbg_gen("this ubi volume is already mounted");
2135 if (!!(flags & MS_RDONLY) != c1->ro_mount) {
2136 err = -EBUSY;
2137 goto out_deact;
2138 }
2139 } else {
2140 err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
2141 if (err)
2142 goto out_deact;
2143
2144 sb->s_flags |= MS_ACTIVE;
2145#ifndef CONFIG_UBIFS_ATIME_SUPPORT
2146 sb->s_flags |= MS_NOATIME;
2147#else
2148 ubifs_msg(c, "full atime support is enabled.");
2149#endif
2150 }
2151
2152
2153 ubi_close_volume(ubi);
2154
2155 return dget(sb->s_root);
2156
2157out_deact:
2158 deactivate_locked_super(sb);
2159out_close:
2160 ubi_close_volume(ubi);
2161 return ERR_PTR(err);
2162}
2163
2164static void kill_ubifs_super(struct super_block *s)
2165{
2166 struct ubifs_info *c = s->s_fs_info;
2167 kill_anon_super(s);
2168 kfree(c);
2169}
2170
2171static struct file_system_type ubifs_fs_type = {
2172 .name = "ubifs",
2173 .owner = THIS_MODULE,
2174 .mount = ubifs_mount,
2175 .kill_sb = kill_ubifs_super,
2176};
2177MODULE_ALIAS_FS("ubifs");
2178
2179
2180
2181
2182static void inode_slab_ctor(void *obj)
2183{
2184 struct ubifs_inode *ui = obj;
2185 inode_init_once(&ui->vfs_inode);
2186}
2187
2188static int __init ubifs_init(void)
2189{
2190 int err;
2191
2192 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2193
2194
2195 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2196 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2197 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2198 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2199 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2200 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2201 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2202 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2203 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2204 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2205 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2206
2207 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2208 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2209 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2210 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2211 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2212 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2213
2214
2215 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2216 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2217 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2218 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2219
2220 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2221 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2222 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2223 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2224
2225
2226 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2227 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2228 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2229 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2230
2231
2232
2233
2234
2235
2236
2237 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2238
2239
2240
2241
2242
2243 if (PAGE_SIZE < UBIFS_BLOCK_SIZE) {
2244 pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2245 current->pid, (unsigned int)PAGE_SIZE);
2246 return -EINVAL;
2247 }
2248
2249 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2250 sizeof(struct ubifs_inode), 0,
2251 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT |
2252 SLAB_ACCOUNT, &inode_slab_ctor);
2253 if (!ubifs_inode_slab)
2254 return -ENOMEM;
2255
2256 err = register_shrinker(&ubifs_shrinker_info);
2257 if (err)
2258 goto out_slab;
2259
2260 err = ubifs_compressors_init();
2261 if (err)
2262 goto out_shrinker;
2263
2264 err = dbg_debugfs_init();
2265 if (err)
2266 goto out_compr;
2267
2268 err = register_filesystem(&ubifs_fs_type);
2269 if (err) {
2270 pr_err("UBIFS error (pid %d): cannot register file system, error %d",
2271 current->pid, err);
2272 goto out_dbg;
2273 }
2274 return 0;
2275
2276out_dbg:
2277 dbg_debugfs_exit();
2278out_compr:
2279 ubifs_compressors_exit();
2280out_shrinker:
2281 unregister_shrinker(&ubifs_shrinker_info);
2282out_slab:
2283 kmem_cache_destroy(ubifs_inode_slab);
2284 return err;
2285}
2286
2287late_initcall(ubifs_init);
2288
2289static void __exit ubifs_exit(void)
2290{
2291 ubifs_assert(list_empty(&ubifs_infos));
2292 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
2293
2294 dbg_debugfs_exit();
2295 ubifs_compressors_exit();
2296 unregister_shrinker(&ubifs_shrinker_info);
2297
2298
2299
2300
2301
2302 rcu_barrier();
2303 kmem_cache_destroy(ubifs_inode_slab);
2304 unregister_filesystem(&ubifs_fs_type);
2305}
2306module_exit(ubifs_exit);
2307
2308MODULE_LICENSE("GPL");
2309MODULE_VERSION(__stringify(UBIFS_VERSION));
2310MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2311MODULE_DESCRIPTION("UBIFS - UBI File System");
2312