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17#include <linux/init.h>
18#include <linux/slab.h>
19#include <linux/module.h>
20#include <linux/ctype.h>
21#include <linux/kthread.h>
22#include <linux/parser.h>
23#include <linux/seq_file.h>
24#include <linux/mount.h>
25#include <linux/math64.h>
26#include <linux/writeback.h>
27#include "ubifs.h"
28
29
30
31
32
33#define UBIFS_KMALLOC_OK (128*1024)
34
35
36static struct kmem_cache *ubifs_inode_slab;
37
38
39static struct shrinker ubifs_shrinker_info = {
40 .scan_objects = ubifs_shrink_scan,
41 .count_objects = ubifs_shrink_count,
42 .seeks = DEFAULT_SEEKS,
43};
44
45
46
47
48
49
50
51
52
53
54
55static int validate_inode(struct ubifs_info *c, const struct inode *inode)
56{
57 int err;
58 const struct ubifs_inode *ui = ubifs_inode(inode);
59
60 if (inode->i_size > c->max_inode_sz) {
61 ubifs_err(c, "inode is too large (%lld)",
62 (long long)inode->i_size);
63 return 1;
64 }
65
66 if (ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
67 ubifs_err(c, "unknown compression type %d", ui->compr_type);
68 return 2;
69 }
70
71 if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
72 return 3;
73
74 if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
75 return 4;
76
77 if (ui->xattr && !S_ISREG(inode->i_mode))
78 return 5;
79
80 if (!ubifs_compr_present(c, ui->compr_type)) {
81 ubifs_warn(c, "inode %lu uses '%s' compression, but it was not compiled in",
82 inode->i_ino, ubifs_compr_name(c, ui->compr_type));
83 }
84
85 err = dbg_check_dir(c, inode);
86 return err;
87}
88
89struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
90{
91 int err;
92 union ubifs_key key;
93 struct ubifs_ino_node *ino;
94 struct ubifs_info *c = sb->s_fs_info;
95 struct inode *inode;
96 struct ubifs_inode *ui;
97
98 dbg_gen("inode %lu", inum);
99
100 inode = iget_locked(sb, inum);
101 if (!inode)
102 return ERR_PTR(-ENOMEM);
103 if (!(inode->i_state & I_NEW))
104 return inode;
105 ui = ubifs_inode(inode);
106
107 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
108 if (!ino) {
109 err = -ENOMEM;
110 goto out;
111 }
112
113 ino_key_init(c, &key, inode->i_ino);
114
115 err = ubifs_tnc_lookup(c, &key, ino);
116 if (err)
117 goto out_ino;
118
119 inode->i_flags |= S_NOCMTIME;
120
121 if (!IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
122 inode->i_flags |= S_NOATIME;
123
124 set_nlink(inode, le32_to_cpu(ino->nlink));
125 i_uid_write(inode, le32_to_cpu(ino->uid));
126 i_gid_write(inode, le32_to_cpu(ino->gid));
127 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
128 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
129 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
130 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
131 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
132 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
133 inode->i_mode = le32_to_cpu(ino->mode);
134 inode->i_size = le64_to_cpu(ino->size);
135
136 ui->data_len = le32_to_cpu(ino->data_len);
137 ui->flags = le32_to_cpu(ino->flags);
138 ui->compr_type = le16_to_cpu(ino->compr_type);
139 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
140 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
141 ui->xattr_size = le32_to_cpu(ino->xattr_size);
142 ui->xattr_names = le32_to_cpu(ino->xattr_names);
143 ui->synced_i_size = ui->ui_size = inode->i_size;
144
145 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
146
147 err = validate_inode(c, inode);
148 if (err)
149 goto out_invalid;
150
151 switch (inode->i_mode & S_IFMT) {
152 case S_IFREG:
153 inode->i_mapping->a_ops = &ubifs_file_address_operations;
154 inode->i_op = &ubifs_file_inode_operations;
155 inode->i_fop = &ubifs_file_operations;
156 if (ui->xattr) {
157 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
158 if (!ui->data) {
159 err = -ENOMEM;
160 goto out_ino;
161 }
162 memcpy(ui->data, ino->data, ui->data_len);
163 ((char *)ui->data)[ui->data_len] = '\0';
164 } else if (ui->data_len != 0) {
165 err = 10;
166 goto out_invalid;
167 }
168 break;
169 case S_IFDIR:
170 inode->i_op = &ubifs_dir_inode_operations;
171 inode->i_fop = &ubifs_dir_operations;
172 if (ui->data_len != 0) {
173 err = 11;
174 goto out_invalid;
175 }
176 break;
177 case S_IFLNK:
178 inode->i_op = &ubifs_symlink_inode_operations;
179 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
180 err = 12;
181 goto out_invalid;
182 }
183 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
184 if (!ui->data) {
185 err = -ENOMEM;
186 goto out_ino;
187 }
188 memcpy(ui->data, ino->data, ui->data_len);
189 ((char *)ui->data)[ui->data_len] = '\0';
190 break;
191 case S_IFBLK:
192 case S_IFCHR:
193 {
194 dev_t rdev;
195 union ubifs_dev_desc *dev;
196
197 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
198 if (!ui->data) {
199 err = -ENOMEM;
200 goto out_ino;
201 }
202
203 dev = (union ubifs_dev_desc *)ino->data;
204 if (ui->data_len == sizeof(dev->new))
205 rdev = new_decode_dev(le32_to_cpu(dev->new));
206 else if (ui->data_len == sizeof(dev->huge))
207 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
208 else {
209 err = 13;
210 goto out_invalid;
211 }
212 memcpy(ui->data, ino->data, ui->data_len);
213 inode->i_op = &ubifs_file_inode_operations;
214 init_special_inode(inode, inode->i_mode, rdev);
215 break;
216 }
217 case S_IFSOCK:
218 case S_IFIFO:
219 inode->i_op = &ubifs_file_inode_operations;
220 init_special_inode(inode, inode->i_mode, 0);
221 if (ui->data_len != 0) {
222 err = 14;
223 goto out_invalid;
224 }
225 break;
226 default:
227 err = 15;
228 goto out_invalid;
229 }
230
231 kfree(ino);
232 ubifs_set_inode_flags(inode);
233 unlock_new_inode(inode);
234 return inode;
235
236out_invalid:
237 ubifs_err(c, "inode %lu validation failed, error %d", inode->i_ino, err);
238 ubifs_dump_node(c, ino);
239 ubifs_dump_inode(c, inode);
240 err = -EINVAL;
241out_ino:
242 kfree(ino);
243out:
244 ubifs_err(c, "failed to read inode %lu, error %d", inode->i_ino, err);
245 iget_failed(inode);
246 return ERR_PTR(err);
247}
248
249static struct inode *ubifs_alloc_inode(struct super_block *sb)
250{
251 struct ubifs_inode *ui;
252
253 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
254 if (!ui)
255 return NULL;
256
257 memset((void *)ui + sizeof(struct inode), 0,
258 sizeof(struct ubifs_inode) - sizeof(struct inode));
259 mutex_init(&ui->ui_mutex);
260 spin_lock_init(&ui->ui_lock);
261 return &ui->vfs_inode;
262};
263
264static void ubifs_free_inode(struct inode *inode)
265{
266 struct ubifs_inode *ui = ubifs_inode(inode);
267
268 kfree(ui->data);
269 fscrypt_free_inode(inode);
270
271 kmem_cache_free(ubifs_inode_slab, ui);
272}
273
274
275
276
277static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
278{
279 int err = 0;
280 struct ubifs_info *c = inode->i_sb->s_fs_info;
281 struct ubifs_inode *ui = ubifs_inode(inode);
282
283 ubifs_assert(c, !ui->xattr);
284 if (is_bad_inode(inode))
285 return 0;
286
287 mutex_lock(&ui->ui_mutex);
288
289
290
291
292
293
294
295 if (!ui->dirty) {
296 mutex_unlock(&ui->ui_mutex);
297 return 0;
298 }
299
300
301
302
303
304 dbg_gen("inode %lu, mode %#x, nlink %u",
305 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
306 if (inode->i_nlink) {
307 err = ubifs_jnl_write_inode(c, inode);
308 if (err)
309 ubifs_err(c, "can't write inode %lu, error %d",
310 inode->i_ino, err);
311 else
312 err = dbg_check_inode_size(c, inode, ui->ui_size);
313 }
314
315 ui->dirty = 0;
316 mutex_unlock(&ui->ui_mutex);
317 ubifs_release_dirty_inode_budget(c, ui);
318 return err;
319}
320
321static void ubifs_evict_inode(struct inode *inode)
322{
323 int err;
324 struct ubifs_info *c = inode->i_sb->s_fs_info;
325 struct ubifs_inode *ui = ubifs_inode(inode);
326
327 if (ui->xattr)
328
329
330
331
332
333 goto out;
334
335 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
336 ubifs_assert(c, !atomic_read(&inode->i_count));
337
338 truncate_inode_pages_final(&inode->i_data);
339
340 if (inode->i_nlink)
341 goto done;
342
343 if (is_bad_inode(inode))
344 goto out;
345
346 ui->ui_size = inode->i_size = 0;
347 err = ubifs_jnl_delete_inode(c, inode);
348 if (err)
349
350
351
352
353 ubifs_err(c, "can't delete inode %lu, error %d",
354 inode->i_ino, err);
355
356out:
357 if (ui->dirty)
358 ubifs_release_dirty_inode_budget(c, ui);
359 else {
360
361 c->bi.nospace = c->bi.nospace_rp = 0;
362 smp_wmb();
363 }
364done:
365 clear_inode(inode);
366 fscrypt_put_encryption_info(inode);
367}
368
369static void ubifs_dirty_inode(struct inode *inode, int flags)
370{
371 struct ubifs_info *c = inode->i_sb->s_fs_info;
372 struct ubifs_inode *ui = ubifs_inode(inode);
373
374 ubifs_assert(c, mutex_is_locked(&ui->ui_mutex));
375 if (!ui->dirty) {
376 ui->dirty = 1;
377 dbg_gen("inode %lu", inode->i_ino);
378 }
379}
380
381static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
382{
383 struct ubifs_info *c = dentry->d_sb->s_fs_info;
384 unsigned long long free;
385 __le32 *uuid = (__le32 *)c->uuid;
386
387 free = ubifs_get_free_space(c);
388 dbg_gen("free space %lld bytes (%lld blocks)",
389 free, free >> UBIFS_BLOCK_SHIFT);
390
391 buf->f_type = UBIFS_SUPER_MAGIC;
392 buf->f_bsize = UBIFS_BLOCK_SIZE;
393 buf->f_blocks = c->block_cnt;
394 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
395 if (free > c->report_rp_size)
396 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
397 else
398 buf->f_bavail = 0;
399 buf->f_files = 0;
400 buf->f_ffree = 0;
401 buf->f_namelen = UBIFS_MAX_NLEN;
402 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
403 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
404 ubifs_assert(c, buf->f_bfree <= c->block_cnt);
405 return 0;
406}
407
408static int ubifs_show_options(struct seq_file *s, struct dentry *root)
409{
410 struct ubifs_info *c = root->d_sb->s_fs_info;
411
412 if (c->mount_opts.unmount_mode == 2)
413 seq_puts(s, ",fast_unmount");
414 else if (c->mount_opts.unmount_mode == 1)
415 seq_puts(s, ",norm_unmount");
416
417 if (c->mount_opts.bulk_read == 2)
418 seq_puts(s, ",bulk_read");
419 else if (c->mount_opts.bulk_read == 1)
420 seq_puts(s, ",no_bulk_read");
421
422 if (c->mount_opts.chk_data_crc == 2)
423 seq_puts(s, ",chk_data_crc");
424 else if (c->mount_opts.chk_data_crc == 1)
425 seq_puts(s, ",no_chk_data_crc");
426
427 if (c->mount_opts.override_compr) {
428 seq_printf(s, ",compr=%s",
429 ubifs_compr_name(c, c->mount_opts.compr_type));
430 }
431
432 seq_printf(s, ",assert=%s", ubifs_assert_action_name(c));
433 seq_printf(s, ",ubi=%d,vol=%d", c->vi.ubi_num, c->vi.vol_id);
434
435 return 0;
436}
437
438static int ubifs_sync_fs(struct super_block *sb, int wait)
439{
440 int i, err;
441 struct ubifs_info *c = sb->s_fs_info;
442
443
444
445
446
447
448 if (!wait)
449 return 0;
450
451
452
453
454
455 for (i = 0; i < c->jhead_cnt; i++) {
456 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
457 if (err)
458 return err;
459 }
460
461
462
463
464
465
466
467
468 err = ubifs_run_commit(c);
469 if (err)
470 return err;
471
472 return ubi_sync(c->vi.ubi_num);
473}
474
475
476
477
478
479
480
481
482
483
484static int init_constants_early(struct ubifs_info *c)
485{
486 if (c->vi.corrupted) {
487 ubifs_warn(c, "UBI volume is corrupted - read-only mode");
488 c->ro_media = 1;
489 }
490
491 if (c->di.ro_mode) {
492 ubifs_msg(c, "read-only UBI device");
493 c->ro_media = 1;
494 }
495
496 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
497 ubifs_msg(c, "static UBI volume - read-only mode");
498 c->ro_media = 1;
499 }
500
501 c->leb_cnt = c->vi.size;
502 c->leb_size = c->vi.usable_leb_size;
503 c->leb_start = c->di.leb_start;
504 c->half_leb_size = c->leb_size / 2;
505 c->min_io_size = c->di.min_io_size;
506 c->min_io_shift = fls(c->min_io_size) - 1;
507 c->max_write_size = c->di.max_write_size;
508 c->max_write_shift = fls(c->max_write_size) - 1;
509
510 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
511 ubifs_errc(c, "too small LEBs (%d bytes), min. is %d bytes",
512 c->leb_size, UBIFS_MIN_LEB_SZ);
513 return -EINVAL;
514 }
515
516 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
517 ubifs_errc(c, "too few LEBs (%d), min. is %d",
518 c->leb_cnt, UBIFS_MIN_LEB_CNT);
519 return -EINVAL;
520 }
521
522 if (!is_power_of_2(c->min_io_size)) {
523 ubifs_errc(c, "bad min. I/O size %d", c->min_io_size);
524 return -EINVAL;
525 }
526
527
528
529
530
531 if (c->max_write_size < c->min_io_size ||
532 c->max_write_size % c->min_io_size ||
533 !is_power_of_2(c->max_write_size)) {
534 ubifs_errc(c, "bad write buffer size %d for %d min. I/O unit",
535 c->max_write_size, c->min_io_size);
536 return -EINVAL;
537 }
538
539
540
541
542
543
544 if (c->min_io_size < 8) {
545 c->min_io_size = 8;
546 c->min_io_shift = 3;
547 if (c->max_write_size < c->min_io_size) {
548 c->max_write_size = c->min_io_size;
549 c->max_write_shift = c->min_io_shift;
550 }
551 }
552
553 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
554 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
555
556
557
558
559
560 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
561 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
562 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
563 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
564 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
565 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
566 c->ranges[UBIFS_AUTH_NODE].min_len = UBIFS_AUTH_NODE_SZ;
567 c->ranges[UBIFS_AUTH_NODE].max_len = UBIFS_AUTH_NODE_SZ +
568 UBIFS_MAX_HMAC_LEN;
569 c->ranges[UBIFS_SIG_NODE].min_len = UBIFS_SIG_NODE_SZ;
570 c->ranges[UBIFS_SIG_NODE].max_len = c->leb_size - UBIFS_SB_NODE_SZ;
571
572 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
573 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
574 c->ranges[UBIFS_ORPH_NODE].min_len =
575 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
576 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
577 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
578 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
579 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
580 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
581 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
582 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
583
584
585
586
587 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
588
589
590
591
592 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
593
594
595
596
597
598 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
599 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
600
601
602
603
604
605
606 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
607
608
609 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
610 if (c->max_bu_buf_len > c->leb_size)
611 c->max_bu_buf_len = c->leb_size;
612
613
614 c->min_log_bytes = c->leb_size;
615
616 return 0;
617}
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
635{
636 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
637}
638
639
640
641
642
643
644
645
646
647
648static int init_constants_sb(struct ubifs_info *c)
649{
650 int tmp, err;
651 long long tmp64;
652
653 c->main_bytes = (long long)c->main_lebs * c->leb_size;
654 c->max_znode_sz = sizeof(struct ubifs_znode) +
655 c->fanout * sizeof(struct ubifs_zbranch);
656
657 tmp = ubifs_idx_node_sz(c, 1);
658 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
659 c->min_idx_node_sz = ALIGN(tmp, 8);
660
661 tmp = ubifs_idx_node_sz(c, c->fanout);
662 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
663 c->max_idx_node_sz = ALIGN(tmp, 8);
664
665
666 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
667 tmp = ALIGN(tmp, c->min_io_size);
668 if (tmp > c->leb_size) {
669 ubifs_err(c, "too small LEB size %d, at least %d needed",
670 c->leb_size, tmp);
671 return -EINVAL;
672 }
673
674
675
676
677
678 tmp64 = c->max_bud_bytes + c->leb_size - 1;
679 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
680 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
681 tmp /= c->leb_size;
682 tmp += 1;
683 if (c->log_lebs < tmp) {
684 ubifs_err(c, "too small log %d LEBs, required min. %d LEBs",
685 c->log_lebs, tmp);
686 return -EINVAL;
687 }
688
689
690
691
692
693
694
695
696 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
697 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
698 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
699
700
701
702
703
704
705
706
707 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
708
709
710
711
712
713
714
715 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
716 if (c->bg_bud_bytes < tmp64)
717 c->bg_bud_bytes = tmp64;
718 if (c->max_bud_bytes < tmp64 + c->leb_size)
719 c->max_bud_bytes = tmp64 + c->leb_size;
720
721 err = ubifs_calc_lpt_geom(c);
722 if (err)
723 return err;
724
725
726 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
727 return 0;
728}
729
730
731
732
733
734
735
736
737
738static void init_constants_master(struct ubifs_info *c)
739{
740 long long tmp64;
741
742 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
743 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
744
745
746
747
748
749
750
751
752
753
754 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
755 tmp64 *= (long long)c->leb_size - c->leb_overhead;
756 tmp64 = ubifs_reported_space(c, tmp64);
757 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
758}
759
760
761
762
763
764
765
766
767
768
769
770
771static int take_gc_lnum(struct ubifs_info *c)
772{
773 int err;
774
775 if (c->gc_lnum == -1) {
776 ubifs_err(c, "no LEB for GC");
777 return -EINVAL;
778 }
779
780
781 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
782 LPROPS_TAKEN, 0, 0);
783 return err;
784}
785
786
787
788
789
790
791
792
793static int alloc_wbufs(struct ubifs_info *c)
794{
795 int i, err;
796
797 c->jheads = kcalloc(c->jhead_cnt, sizeof(struct ubifs_jhead),
798 GFP_KERNEL);
799 if (!c->jheads)
800 return -ENOMEM;
801
802
803 for (i = 0; i < c->jhead_cnt; i++) {
804 INIT_LIST_HEAD(&c->jheads[i].buds_list);
805 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
806 if (err)
807 return err;
808
809 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
810 c->jheads[i].wbuf.jhead = i;
811 c->jheads[i].grouped = 1;
812 c->jheads[i].log_hash = ubifs_hash_get_desc(c);
813 if (IS_ERR(c->jheads[i].log_hash))
814 goto out;
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
826out:
827 while (i--)
828 kfree(c->jheads[i].log_hash);
829
830 return err;
831}
832
833
834
835
836
837static void free_wbufs(struct ubifs_info *c)
838{
839 int i;
840
841 if (c->jheads) {
842 for (i = 0; i < c->jhead_cnt; i++) {
843 kfree(c->jheads[i].wbuf.buf);
844 kfree(c->jheads[i].wbuf.inodes);
845 kfree(c->jheads[i].log_hash);
846 }
847 kfree(c->jheads);
848 c->jheads = NULL;
849 }
850}
851
852
853
854
855
856static void free_orphans(struct ubifs_info *c)
857{
858 struct ubifs_orphan *orph;
859
860 while (c->orph_dnext) {
861 orph = c->orph_dnext;
862 c->orph_dnext = orph->dnext;
863 list_del(&orph->list);
864 kfree(orph);
865 }
866
867 while (!list_empty(&c->orph_list)) {
868 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
869 list_del(&orph->list);
870 kfree(orph);
871 ubifs_err(c, "orphan list not empty at unmount");
872 }
873
874 vfree(c->orph_buf);
875 c->orph_buf = NULL;
876}
877
878
879
880
881
882static void free_buds(struct ubifs_info *c)
883{
884 struct ubifs_bud *bud, *n;
885
886 rbtree_postorder_for_each_entry_safe(bud, n, &c->buds, rb)
887 kfree(bud);
888}
889
890
891
892
893
894
895
896
897
898
899static int check_volume_empty(struct ubifs_info *c)
900{
901 int lnum, err;
902
903 c->empty = 1;
904 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
905 err = ubifs_is_mapped(c, lnum);
906 if (unlikely(err < 0))
907 return err;
908 if (err == 1) {
909 c->empty = 0;
910 break;
911 }
912
913 cond_resched();
914 }
915
916 return 0;
917}
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934enum {
935 Opt_fast_unmount,
936 Opt_norm_unmount,
937 Opt_bulk_read,
938 Opt_no_bulk_read,
939 Opt_chk_data_crc,
940 Opt_no_chk_data_crc,
941 Opt_override_compr,
942 Opt_assert,
943 Opt_auth_key,
944 Opt_auth_hash_name,
945 Opt_ignore,
946 Opt_err,
947};
948
949static const match_table_t tokens = {
950 {Opt_fast_unmount, "fast_unmount"},
951 {Opt_norm_unmount, "norm_unmount"},
952 {Opt_bulk_read, "bulk_read"},
953 {Opt_no_bulk_read, "no_bulk_read"},
954 {Opt_chk_data_crc, "chk_data_crc"},
955 {Opt_no_chk_data_crc, "no_chk_data_crc"},
956 {Opt_override_compr, "compr=%s"},
957 {Opt_auth_key, "auth_key=%s"},
958 {Opt_auth_hash_name, "auth_hash_name=%s"},
959 {Opt_ignore, "ubi=%s"},
960 {Opt_ignore, "vol=%s"},
961 {Opt_assert, "assert=%s"},
962 {Opt_err, NULL},
963};
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978static int parse_standard_option(const char *option)
979{
980
981 pr_notice("UBIFS: parse %s\n", option);
982 if (!strcmp(option, "sync"))
983 return SB_SYNCHRONOUS;
984 return 0;
985}
986
987
988
989
990
991
992
993
994
995
996static int ubifs_parse_options(struct ubifs_info *c, char *options,
997 int is_remount)
998{
999 char *p;
1000 substring_t args[MAX_OPT_ARGS];
1001
1002 if (!options)
1003 return 0;
1004
1005 while ((p = strsep(&options, ","))) {
1006 int token;
1007
1008 if (!*p)
1009 continue;
1010
1011 token = match_token(p, tokens, args);
1012 switch (token) {
1013
1014
1015
1016
1017
1018 case Opt_fast_unmount:
1019 c->mount_opts.unmount_mode = 2;
1020 break;
1021 case Opt_norm_unmount:
1022 c->mount_opts.unmount_mode = 1;
1023 break;
1024 case Opt_bulk_read:
1025 c->mount_opts.bulk_read = 2;
1026 c->bulk_read = 1;
1027 break;
1028 case Opt_no_bulk_read:
1029 c->mount_opts.bulk_read = 1;
1030 c->bulk_read = 0;
1031 break;
1032 case Opt_chk_data_crc:
1033 c->mount_opts.chk_data_crc = 2;
1034 c->no_chk_data_crc = 0;
1035 break;
1036 case Opt_no_chk_data_crc:
1037 c->mount_opts.chk_data_crc = 1;
1038 c->no_chk_data_crc = 1;
1039 break;
1040 case Opt_override_compr:
1041 {
1042 char *name = match_strdup(&args[0]);
1043
1044 if (!name)
1045 return -ENOMEM;
1046 if (!strcmp(name, "none"))
1047 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1048 else if (!strcmp(name, "lzo"))
1049 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1050 else if (!strcmp(name, "zlib"))
1051 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1052 else if (!strcmp(name, "zstd"))
1053 c->mount_opts.compr_type = UBIFS_COMPR_ZSTD;
1054 else {
1055 ubifs_err(c, "unknown compressor \"%s\"", name);
1056 kfree(name);
1057 return -EINVAL;
1058 }
1059 kfree(name);
1060 c->mount_opts.override_compr = 1;
1061 c->default_compr = c->mount_opts.compr_type;
1062 break;
1063 }
1064 case Opt_assert:
1065 {
1066 char *act = match_strdup(&args[0]);
1067
1068 if (!act)
1069 return -ENOMEM;
1070 if (!strcmp(act, "report"))
1071 c->assert_action = ASSACT_REPORT;
1072 else if (!strcmp(act, "read-only"))
1073 c->assert_action = ASSACT_RO;
1074 else if (!strcmp(act, "panic"))
1075 c->assert_action = ASSACT_PANIC;
1076 else {
1077 ubifs_err(c, "unknown assert action \"%s\"", act);
1078 kfree(act);
1079 return -EINVAL;
1080 }
1081 kfree(act);
1082 break;
1083 }
1084 case Opt_auth_key:
1085 c->auth_key_name = kstrdup(args[0].from, GFP_KERNEL);
1086 if (!c->auth_key_name)
1087 return -ENOMEM;
1088 break;
1089 case Opt_auth_hash_name:
1090 c->auth_hash_name = kstrdup(args[0].from, GFP_KERNEL);
1091 if (!c->auth_hash_name)
1092 return -ENOMEM;
1093 break;
1094 case Opt_ignore:
1095 break;
1096 default:
1097 {
1098 unsigned long flag;
1099 struct super_block *sb = c->vfs_sb;
1100
1101 flag = parse_standard_option(p);
1102 if (!flag) {
1103 ubifs_err(c, "unrecognized mount option \"%s\" or missing value",
1104 p);
1105 return -EINVAL;
1106 }
1107 sb->s_flags |= flag;
1108 break;
1109 }
1110 }
1111 }
1112
1113 return 0;
1114}
1115
1116
1117
1118
1119
1120
1121
1122
1123static void destroy_journal(struct ubifs_info *c)
1124{
1125 while (!list_empty(&c->unclean_leb_list)) {
1126 struct ubifs_unclean_leb *ucleb;
1127
1128 ucleb = list_entry(c->unclean_leb_list.next,
1129 struct ubifs_unclean_leb, list);
1130 list_del(&ucleb->list);
1131 kfree(ucleb);
1132 }
1133 while (!list_empty(&c->old_buds)) {
1134 struct ubifs_bud *bud;
1135
1136 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1137 list_del(&bud->list);
1138 kfree(bud);
1139 }
1140 ubifs_destroy_idx_gc(c);
1141 ubifs_destroy_size_tree(c);
1142 ubifs_tnc_close(c);
1143 free_buds(c);
1144}
1145
1146
1147
1148
1149
1150static void bu_init(struct ubifs_info *c)
1151{
1152 ubifs_assert(c, c->bulk_read == 1);
1153
1154 if (c->bu.buf)
1155 return;
1156
1157again:
1158 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1159 if (!c->bu.buf) {
1160 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1161 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1162 goto again;
1163 }
1164
1165
1166 ubifs_warn(c, "cannot allocate %d bytes of memory for bulk-read, disabling it",
1167 c->max_bu_buf_len);
1168 c->mount_opts.bulk_read = 1;
1169 c->bulk_read = 0;
1170 return;
1171 }
1172}
1173
1174
1175
1176
1177
1178
1179
1180
1181static int check_free_space(struct ubifs_info *c)
1182{
1183 ubifs_assert(c, c->dark_wm > 0);
1184 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1185 ubifs_err(c, "insufficient free space to mount in R/W mode");
1186 ubifs_dump_budg(c, &c->bi);
1187 ubifs_dump_lprops(c);
1188 return -ENOSPC;
1189 }
1190 return 0;
1191}
1192
1193
1194
1195
1196
1197
1198
1199
1200static int mount_ubifs(struct ubifs_info *c)
1201{
1202 int err;
1203 long long x, y;
1204 size_t sz;
1205
1206 c->ro_mount = !!sb_rdonly(c->vfs_sb);
1207
1208 c->probing = !!(c->vfs_sb->s_flags & SB_SILENT);
1209
1210 err = init_constants_early(c);
1211 if (err)
1212 return err;
1213
1214 err = ubifs_debugging_init(c);
1215 if (err)
1216 return err;
1217
1218 err = check_volume_empty(c);
1219 if (err)
1220 goto out_free;
1221
1222 if (c->empty && (c->ro_mount || c->ro_media)) {
1223
1224
1225
1226
1227 ubifs_err(c, "can't format empty UBI volume: read-only %s",
1228 c->ro_media ? "UBI volume" : "mount");
1229 err = -EROFS;
1230 goto out_free;
1231 }
1232
1233 if (c->ro_media && !c->ro_mount) {
1234 ubifs_err(c, "cannot mount read-write - read-only media");
1235 err = -EROFS;
1236 goto out_free;
1237 }
1238
1239
1240
1241
1242
1243
1244 err = -ENOMEM;
1245 c->bottom_up_buf = kmalloc_array(BOTTOM_UP_HEIGHT, sizeof(int),
1246 GFP_KERNEL);
1247 if (!c->bottom_up_buf)
1248 goto out_free;
1249
1250 c->sbuf = vmalloc(c->leb_size);
1251 if (!c->sbuf)
1252 goto out_free;
1253
1254 if (!c->ro_mount) {
1255 c->ileb_buf = vmalloc(c->leb_size);
1256 if (!c->ileb_buf)
1257 goto out_free;
1258 }
1259
1260 if (c->bulk_read == 1)
1261 bu_init(c);
1262
1263 if (!c->ro_mount) {
1264 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
1265 UBIFS_CIPHER_BLOCK_SIZE,
1266 GFP_KERNEL);
1267 if (!c->write_reserve_buf)
1268 goto out_free;
1269 }
1270
1271 c->mounting = 1;
1272
1273 if (c->auth_key_name) {
1274 if (IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) {
1275 err = ubifs_init_authentication(c);
1276 if (err)
1277 goto out_free;
1278 } else {
1279 ubifs_err(c, "auth_key_name, but UBIFS is built without"
1280 " authentication support");
1281 err = -EINVAL;
1282 goto out_free;
1283 }
1284 }
1285
1286 err = ubifs_read_superblock(c);
1287 if (err)
1288 goto out_free;
1289
1290 c->probing = 0;
1291
1292
1293
1294
1295
1296 if (!ubifs_compr_present(c, c->default_compr)) {
1297 ubifs_err(c, "'compressor \"%s\" is not compiled in",
1298 ubifs_compr_name(c, c->default_compr));
1299 err = -ENOTSUPP;
1300 goto out_free;
1301 }
1302
1303 err = init_constants_sb(c);
1304 if (err)
1305 goto out_free;
1306
1307 sz = ALIGN(c->max_idx_node_sz, c->min_io_size) * 2;
1308 c->cbuf = kmalloc(sz, GFP_NOFS);
1309 if (!c->cbuf) {
1310 err = -ENOMEM;
1311 goto out_free;
1312 }
1313
1314 err = alloc_wbufs(c);
1315 if (err)
1316 goto out_cbuf;
1317
1318 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
1319 if (!c->ro_mount) {
1320
1321 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1322 if (IS_ERR(c->bgt)) {
1323 err = PTR_ERR(c->bgt);
1324 c->bgt = NULL;
1325 ubifs_err(c, "cannot spawn \"%s\", error %d",
1326 c->bgt_name, err);
1327 goto out_wbufs;
1328 }
1329 wake_up_process(c->bgt);
1330 }
1331
1332 err = ubifs_read_master(c);
1333 if (err)
1334 goto out_master;
1335
1336 init_constants_master(c);
1337
1338 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1339 ubifs_msg(c, "recovery needed");
1340 c->need_recovery = 1;
1341 }
1342
1343 if (c->need_recovery && !c->ro_mount) {
1344 err = ubifs_recover_inl_heads(c, c->sbuf);
1345 if (err)
1346 goto out_master;
1347 }
1348
1349 err = ubifs_lpt_init(c, 1, !c->ro_mount);
1350 if (err)
1351 goto out_master;
1352
1353 if (!c->ro_mount && c->space_fixup) {
1354 err = ubifs_fixup_free_space(c);
1355 if (err)
1356 goto out_lpt;
1357 }
1358
1359 if (!c->ro_mount && !c->need_recovery) {
1360
1361
1362
1363
1364 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1365 err = ubifs_write_master(c);
1366 if (err)
1367 goto out_lpt;
1368 }
1369
1370
1371
1372
1373
1374
1375
1376 if (ubifs_authenticated(c) && ubifs_hmac_zero(c, c->sup_node->hmac)) {
1377 err = ubifs_hmac_wkm(c, c->sup_node->hmac_wkm);
1378 if (err)
1379 goto out_lpt;
1380 c->superblock_need_write = 1;
1381 }
1382
1383 if (!c->ro_mount && c->superblock_need_write) {
1384 err = ubifs_write_sb_node(c, c->sup_node);
1385 if (err)
1386 goto out_lpt;
1387 c->superblock_need_write = 0;
1388 }
1389
1390 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
1391 if (err)
1392 goto out_lpt;
1393
1394 err = ubifs_replay_journal(c);
1395 if (err)
1396 goto out_journal;
1397
1398
1399 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1400
1401 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
1402 if (err)
1403 goto out_orphans;
1404
1405 if (!c->ro_mount) {
1406 int lnum;
1407
1408 err = check_free_space(c);
1409 if (err)
1410 goto out_orphans;
1411
1412
1413 lnum = c->lhead_lnum + 1;
1414 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1415 lnum = UBIFS_LOG_LNUM;
1416 if (lnum == c->ltail_lnum) {
1417 err = ubifs_consolidate_log(c);
1418 if (err)
1419 goto out_orphans;
1420 }
1421
1422 if (c->need_recovery) {
1423 if (!ubifs_authenticated(c)) {
1424 err = ubifs_recover_size(c, true);
1425 if (err)
1426 goto out_orphans;
1427 }
1428
1429 err = ubifs_rcvry_gc_commit(c);
1430 if (err)
1431 goto out_orphans;
1432
1433 if (ubifs_authenticated(c)) {
1434 err = ubifs_recover_size(c, false);
1435 if (err)
1436 goto out_orphans;
1437 }
1438 } else {
1439 err = take_gc_lnum(c);
1440 if (err)
1441 goto out_orphans;
1442
1443
1444
1445
1446
1447 err = ubifs_leb_unmap(c, c->gc_lnum);
1448 if (err)
1449 goto out_orphans;
1450 }
1451
1452 err = dbg_check_lprops(c);
1453 if (err)
1454 goto out_orphans;
1455 } else if (c->need_recovery) {
1456 err = ubifs_recover_size(c, false);
1457 if (err)
1458 goto out_orphans;
1459 } else {
1460
1461
1462
1463
1464
1465
1466 err = take_gc_lnum(c);
1467 if (err)
1468 goto out_orphans;
1469 }
1470
1471 spin_lock(&ubifs_infos_lock);
1472 list_add_tail(&c->infos_list, &ubifs_infos);
1473 spin_unlock(&ubifs_infos_lock);
1474
1475 if (c->need_recovery) {
1476 if (c->ro_mount)
1477 ubifs_msg(c, "recovery deferred");
1478 else {
1479 c->need_recovery = 0;
1480 ubifs_msg(c, "recovery completed");
1481
1482
1483
1484
1485
1486 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
1487 }
1488 } else
1489 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
1490
1491 err = dbg_check_filesystem(c);
1492 if (err)
1493 goto out_infos;
1494
1495 dbg_debugfs_init_fs(c);
1496
1497 c->mounting = 0;
1498
1499 ubifs_msg(c, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
1500 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1501 c->ro_mount ? ", R/O mode" : "");
1502 x = (long long)c->main_lebs * c->leb_size;
1503 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1504 ubifs_msg(c, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1505 c->leb_size, c->leb_size >> 10, c->min_io_size,
1506 c->max_write_size);
1507 ubifs_msg(c, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1508 x, x >> 20, c->main_lebs,
1509 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1510 ubifs_msg(c, "reserved for root: %llu bytes (%llu KiB)",
1511 c->report_rp_size, c->report_rp_size >> 10);
1512 ubifs_msg(c, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1513 c->fmt_version, c->ro_compat_version,
1514 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1515 c->big_lpt ? ", big LPT model" : ", small LPT model");
1516
1517 dbg_gen("default compressor: %s", ubifs_compr_name(c, c->default_compr));
1518 dbg_gen("data journal heads: %d",
1519 c->jhead_cnt - NONDATA_JHEADS_CNT);
1520 dbg_gen("log LEBs: %d (%d - %d)",
1521 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1522 dbg_gen("LPT area LEBs: %d (%d - %d)",
1523 c->lpt_lebs, c->lpt_first, c->lpt_last);
1524 dbg_gen("orphan area LEBs: %d (%d - %d)",
1525 c->orph_lebs, c->orph_first, c->orph_last);
1526 dbg_gen("main area LEBs: %d (%d - %d)",
1527 c->main_lebs, c->main_first, c->leb_cnt - 1);
1528 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1529 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1530 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1531 c->bi.old_idx_sz >> 20);
1532 dbg_gen("key hash type: %d", c->key_hash_type);
1533 dbg_gen("tree fanout: %d", c->fanout);
1534 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1535 dbg_gen("max. znode size %d", c->max_znode_sz);
1536 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1537 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1538 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1539 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1540 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1541 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1542 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1543 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1544 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1545 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
1546 dbg_gen("dead watermark: %d", c->dead_wm);
1547 dbg_gen("dark watermark: %d", c->dark_wm);
1548 dbg_gen("LEB overhead: %d", c->leb_overhead);
1549 x = (long long)c->main_lebs * c->dark_wm;
1550 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1551 x, x >> 10, x >> 20);
1552 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1553 c->max_bud_bytes, c->max_bud_bytes >> 10,
1554 c->max_bud_bytes >> 20);
1555 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1556 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1557 c->bg_bud_bytes >> 20);
1558 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1559 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1560 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1561 dbg_gen("commit number: %llu", c->cmt_no);
1562 dbg_gen("max. xattrs per inode: %d", ubifs_xattr_max_cnt(c));
1563 dbg_gen("max orphans: %d", c->max_orphans);
1564
1565 return 0;
1566
1567out_infos:
1568 spin_lock(&ubifs_infos_lock);
1569 list_del(&c->infos_list);
1570 spin_unlock(&ubifs_infos_lock);
1571out_orphans:
1572 free_orphans(c);
1573out_journal:
1574 destroy_journal(c);
1575out_lpt:
1576 ubifs_lpt_free(c, 0);
1577out_master:
1578 kfree(c->mst_node);
1579 kfree(c->rcvrd_mst_node);
1580 if (c->bgt)
1581 kthread_stop(c->bgt);
1582out_wbufs:
1583 free_wbufs(c);
1584out_cbuf:
1585 kfree(c->cbuf);
1586out_free:
1587 kfree(c->write_reserve_buf);
1588 kfree(c->bu.buf);
1589 vfree(c->ileb_buf);
1590 vfree(c->sbuf);
1591 kfree(c->bottom_up_buf);
1592 ubifs_debugging_exit(c);
1593 return err;
1594}
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605static void ubifs_umount(struct ubifs_info *c)
1606{
1607 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1608 c->vi.vol_id);
1609
1610 dbg_debugfs_exit_fs(c);
1611 spin_lock(&ubifs_infos_lock);
1612 list_del(&c->infos_list);
1613 spin_unlock(&ubifs_infos_lock);
1614
1615 if (c->bgt)
1616 kthread_stop(c->bgt);
1617
1618 destroy_journal(c);
1619 free_wbufs(c);
1620 free_orphans(c);
1621 ubifs_lpt_free(c, 0);
1622 ubifs_exit_authentication(c);
1623
1624 kfree(c->auth_key_name);
1625 kfree(c->auth_hash_name);
1626 kfree(c->cbuf);
1627 kfree(c->rcvrd_mst_node);
1628 kfree(c->mst_node);
1629 kfree(c->write_reserve_buf);
1630 kfree(c->bu.buf);
1631 vfree(c->ileb_buf);
1632 vfree(c->sbuf);
1633 kfree(c->bottom_up_buf);
1634 ubifs_debugging_exit(c);
1635}
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645static int ubifs_remount_rw(struct ubifs_info *c)
1646{
1647 int err, lnum;
1648
1649 if (c->rw_incompat) {
1650 ubifs_err(c, "the file-system is not R/W-compatible");
1651 ubifs_msg(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1652 c->fmt_version, c->ro_compat_version,
1653 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
1654 return -EROFS;
1655 }
1656
1657 mutex_lock(&c->umount_mutex);
1658 dbg_save_space_info(c);
1659 c->remounting_rw = 1;
1660 c->ro_mount = 0;
1661
1662 if (c->space_fixup) {
1663 err = ubifs_fixup_free_space(c);
1664 if (err)
1665 goto out;
1666 }
1667
1668 err = check_free_space(c);
1669 if (err)
1670 goto out;
1671
1672 if (c->need_recovery) {
1673 ubifs_msg(c, "completing deferred recovery");
1674 err = ubifs_write_rcvrd_mst_node(c);
1675 if (err)
1676 goto out;
1677 if (!ubifs_authenticated(c)) {
1678 err = ubifs_recover_size(c, true);
1679 if (err)
1680 goto out;
1681 }
1682 err = ubifs_clean_lebs(c, c->sbuf);
1683 if (err)
1684 goto out;
1685 err = ubifs_recover_inl_heads(c, c->sbuf);
1686 if (err)
1687 goto out;
1688 } else {
1689
1690 ubifs_assert(c, c->tot_orphans == 0);
1691 err = ubifs_clear_orphans(c);
1692 if (err)
1693 goto out;
1694 }
1695
1696 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1697 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1698 err = ubifs_write_master(c);
1699 if (err)
1700 goto out;
1701 }
1702
1703 if (c->superblock_need_write) {
1704 struct ubifs_sb_node *sup = c->sup_node;
1705
1706 err = ubifs_write_sb_node(c, sup);
1707 if (err)
1708 goto out;
1709
1710 c->superblock_need_write = 0;
1711 }
1712
1713 c->ileb_buf = vmalloc(c->leb_size);
1714 if (!c->ileb_buf) {
1715 err = -ENOMEM;
1716 goto out;
1717 }
1718
1719 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ + \
1720 UBIFS_CIPHER_BLOCK_SIZE, GFP_KERNEL);
1721 if (!c->write_reserve_buf) {
1722 err = -ENOMEM;
1723 goto out;
1724 }
1725
1726 err = ubifs_lpt_init(c, 0, 1);
1727 if (err)
1728 goto out;
1729
1730
1731 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
1732 if (IS_ERR(c->bgt)) {
1733 err = PTR_ERR(c->bgt);
1734 c->bgt = NULL;
1735 ubifs_err(c, "cannot spawn \"%s\", error %d",
1736 c->bgt_name, err);
1737 goto out;
1738 }
1739 wake_up_process(c->bgt);
1740
1741 c->orph_buf = vmalloc(c->leb_size);
1742 if (!c->orph_buf) {
1743 err = -ENOMEM;
1744 goto out;
1745 }
1746
1747
1748 lnum = c->lhead_lnum + 1;
1749 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1750 lnum = UBIFS_LOG_LNUM;
1751 if (lnum == c->ltail_lnum) {
1752 err = ubifs_consolidate_log(c);
1753 if (err)
1754 goto out;
1755 }
1756
1757 if (c->need_recovery) {
1758 err = ubifs_rcvry_gc_commit(c);
1759 if (err)
1760 goto out;
1761
1762 if (ubifs_authenticated(c)) {
1763 err = ubifs_recover_size(c, false);
1764 if (err)
1765 goto out;
1766 }
1767 } else {
1768 err = ubifs_leb_unmap(c, c->gc_lnum);
1769 }
1770 if (err)
1771 goto out;
1772
1773 dbg_gen("re-mounted read-write");
1774 c->remounting_rw = 0;
1775
1776 if (c->need_recovery) {
1777 c->need_recovery = 0;
1778 ubifs_msg(c, "deferred recovery completed");
1779 } else {
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790 err = dbg_check_space_info(c);
1791 }
1792
1793 mutex_unlock(&c->umount_mutex);
1794 return err;
1795
1796out:
1797 c->ro_mount = 1;
1798 vfree(c->orph_buf);
1799 c->orph_buf = NULL;
1800 if (c->bgt) {
1801 kthread_stop(c->bgt);
1802 c->bgt = NULL;
1803 }
1804 free_wbufs(c);
1805 kfree(c->write_reserve_buf);
1806 c->write_reserve_buf = NULL;
1807 vfree(c->ileb_buf);
1808 c->ileb_buf = NULL;
1809 ubifs_lpt_free(c, 1);
1810 c->remounting_rw = 0;
1811 mutex_unlock(&c->umount_mutex);
1812 return err;
1813}
1814
1815
1816
1817
1818
1819
1820
1821
1822static void ubifs_remount_ro(struct ubifs_info *c)
1823{
1824 int i, err;
1825
1826 ubifs_assert(c, !c->need_recovery);
1827 ubifs_assert(c, !c->ro_mount);
1828
1829 mutex_lock(&c->umount_mutex);
1830 if (c->bgt) {
1831 kthread_stop(c->bgt);
1832 c->bgt = NULL;
1833 }
1834
1835 dbg_save_space_info(c);
1836
1837 for (i = 0; i < c->jhead_cnt; i++) {
1838 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1839 if (err)
1840 ubifs_ro_mode(c, err);
1841 }
1842
1843 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1844 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1845 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1846 err = ubifs_write_master(c);
1847 if (err)
1848 ubifs_ro_mode(c, err);
1849
1850 vfree(c->orph_buf);
1851 c->orph_buf = NULL;
1852 kfree(c->write_reserve_buf);
1853 c->write_reserve_buf = NULL;
1854 vfree(c->ileb_buf);
1855 c->ileb_buf = NULL;
1856 ubifs_lpt_free(c, 1);
1857 c->ro_mount = 1;
1858 err = dbg_check_space_info(c);
1859 if (err)
1860 ubifs_ro_mode(c, err);
1861 mutex_unlock(&c->umount_mutex);
1862}
1863
1864static void ubifs_put_super(struct super_block *sb)
1865{
1866 int i;
1867 struct ubifs_info *c = sb->s_fs_info;
1868
1869 ubifs_msg(c, "un-mount UBI device %d", c->vi.ubi_num);
1870
1871
1872
1873
1874
1875
1876 if (!c->ro_error) {
1877 ubifs_assert(c, c->bi.idx_growth == 0);
1878 ubifs_assert(c, c->bi.dd_growth == 0);
1879 ubifs_assert(c, c->bi.data_growth == 0);
1880 }
1881
1882
1883
1884
1885
1886
1887
1888 mutex_lock(&c->umount_mutex);
1889 if (!c->ro_mount) {
1890
1891
1892
1893
1894 if (c->bgt) {
1895 kthread_stop(c->bgt);
1896 c->bgt = NULL;
1897 }
1898
1899
1900
1901
1902
1903 if (!c->ro_error) {
1904 int err;
1905
1906
1907 for (i = 0; i < c->jhead_cnt; i++) {
1908 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
1909 if (err)
1910 ubifs_ro_mode(c, err);
1911 }
1912
1913
1914
1915
1916
1917
1918 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1919 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1920 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1921 err = ubifs_write_master(c);
1922 if (err)
1923
1924
1925
1926
1927
1928 ubifs_err(c, "failed to write master node, error %d",
1929 err);
1930 } else {
1931 for (i = 0; i < c->jhead_cnt; i++)
1932
1933 hrtimer_cancel(&c->jheads[i].wbuf.timer);
1934 }
1935 }
1936
1937 ubifs_umount(c);
1938 ubi_close_volume(c->ubi);
1939 mutex_unlock(&c->umount_mutex);
1940}
1941
1942static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
1943{
1944 int err;
1945 struct ubifs_info *c = sb->s_fs_info;
1946
1947 sync_filesystem(sb);
1948 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
1949
1950 err = ubifs_parse_options(c, data, 1);
1951 if (err) {
1952 ubifs_err(c, "invalid or unknown remount parameter");
1953 return err;
1954 }
1955
1956 if (c->ro_mount && !(*flags & SB_RDONLY)) {
1957 if (c->ro_error) {
1958 ubifs_msg(c, "cannot re-mount R/W due to prior errors");
1959 return -EROFS;
1960 }
1961 if (c->ro_media) {
1962 ubifs_msg(c, "cannot re-mount R/W - UBI volume is R/O");
1963 return -EROFS;
1964 }
1965 err = ubifs_remount_rw(c);
1966 if (err)
1967 return err;
1968 } else if (!c->ro_mount && (*flags & SB_RDONLY)) {
1969 if (c->ro_error) {
1970 ubifs_msg(c, "cannot re-mount R/O due to prior errors");
1971 return -EROFS;
1972 }
1973 ubifs_remount_ro(c);
1974 }
1975
1976 if (c->bulk_read == 1)
1977 bu_init(c);
1978 else {
1979 dbg_gen("disable bulk-read");
1980 mutex_lock(&c->bu_mutex);
1981 kfree(c->bu.buf);
1982 c->bu.buf = NULL;
1983 mutex_unlock(&c->bu_mutex);
1984 }
1985
1986 if (!c->need_recovery)
1987 ubifs_assert(c, c->lst.taken_empty_lebs > 0);
1988
1989 return 0;
1990}
1991
1992const struct super_operations ubifs_super_operations = {
1993 .alloc_inode = ubifs_alloc_inode,
1994 .free_inode = ubifs_free_inode,
1995 .put_super = ubifs_put_super,
1996 .write_inode = ubifs_write_inode,
1997 .evict_inode = ubifs_evict_inode,
1998 .statfs = ubifs_statfs,
1999 .dirty_inode = ubifs_dirty_inode,
2000 .remount_fs = ubifs_remount_fs,
2001 .show_options = ubifs_show_options,
2002 .sync_fs = ubifs_sync_fs,
2003};
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024static struct ubi_volume_desc *open_ubi(const char *name, int mode)
2025{
2026 struct ubi_volume_desc *ubi;
2027 int dev, vol;
2028 char *endptr;
2029
2030 if (!name || !*name)
2031 return ERR_PTR(-EINVAL);
2032
2033
2034 ubi = ubi_open_volume_path(name, mode);
2035 if (!IS_ERR(ubi))
2036 return ubi;
2037
2038
2039 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
2040 return ERR_PTR(-EINVAL);
2041
2042
2043 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
2044 return ubi_open_volume_nm(0, name + 4, mode);
2045
2046 if (!isdigit(name[3]))
2047 return ERR_PTR(-EINVAL);
2048
2049 dev = simple_strtoul(name + 3, &endptr, 0);
2050
2051
2052 if (*endptr == '\0')
2053 return ubi_open_volume(0, dev, mode);
2054
2055
2056 if (*endptr == '_' && isdigit(endptr[1])) {
2057 vol = simple_strtoul(endptr + 1, &endptr, 0);
2058 if (*endptr != '\0')
2059 return ERR_PTR(-EINVAL);
2060 return ubi_open_volume(dev, vol, mode);
2061 }
2062
2063
2064 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
2065 return ubi_open_volume_nm(dev, ++endptr, mode);
2066
2067 return ERR_PTR(-EINVAL);
2068}
2069
2070static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
2071{
2072 struct ubifs_info *c;
2073
2074 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
2075 if (c) {
2076 spin_lock_init(&c->cnt_lock);
2077 spin_lock_init(&c->cs_lock);
2078 spin_lock_init(&c->buds_lock);
2079 spin_lock_init(&c->space_lock);
2080 spin_lock_init(&c->orphan_lock);
2081 init_rwsem(&c->commit_sem);
2082 mutex_init(&c->lp_mutex);
2083 mutex_init(&c->tnc_mutex);
2084 mutex_init(&c->log_mutex);
2085 mutex_init(&c->umount_mutex);
2086 mutex_init(&c->bu_mutex);
2087 mutex_init(&c->write_reserve_mutex);
2088 init_waitqueue_head(&c->cmt_wq);
2089 c->buds = RB_ROOT;
2090 c->old_idx = RB_ROOT;
2091 c->size_tree = RB_ROOT;
2092 c->orph_tree = RB_ROOT;
2093 INIT_LIST_HEAD(&c->infos_list);
2094 INIT_LIST_HEAD(&c->idx_gc);
2095 INIT_LIST_HEAD(&c->replay_list);
2096 INIT_LIST_HEAD(&c->replay_buds);
2097 INIT_LIST_HEAD(&c->uncat_list);
2098 INIT_LIST_HEAD(&c->empty_list);
2099 INIT_LIST_HEAD(&c->freeable_list);
2100 INIT_LIST_HEAD(&c->frdi_idx_list);
2101 INIT_LIST_HEAD(&c->unclean_leb_list);
2102 INIT_LIST_HEAD(&c->old_buds);
2103 INIT_LIST_HEAD(&c->orph_list);
2104 INIT_LIST_HEAD(&c->orph_new);
2105 c->no_chk_data_crc = 1;
2106 c->assert_action = ASSACT_RO;
2107
2108 c->highest_inum = UBIFS_FIRST_INO;
2109 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
2110
2111 ubi_get_volume_info(ubi, &c->vi);
2112 ubi_get_device_info(c->vi.ubi_num, &c->di);
2113 }
2114 return c;
2115}
2116
2117static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
2118{
2119 struct ubifs_info *c = sb->s_fs_info;
2120 struct inode *root;
2121 int err;
2122
2123 c->vfs_sb = sb;
2124
2125 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2126 if (IS_ERR(c->ubi)) {
2127 err = PTR_ERR(c->ubi);
2128 goto out;
2129 }
2130
2131 err = ubifs_parse_options(c, data, 0);
2132 if (err)
2133 goto out_close;
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145 err = super_setup_bdi_name(sb, "ubifs_%d_%d", c->vi.ubi_num,
2146 c->vi.vol_id);
2147 if (err)
2148 goto out_close;
2149
2150 sb->s_fs_info = c;
2151 sb->s_magic = UBIFS_SUPER_MAGIC;
2152 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2153 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
2154 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2155 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2156 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2157 sb->s_op = &ubifs_super_operations;
2158#ifdef CONFIG_UBIFS_FS_XATTR
2159 sb->s_xattr = ubifs_xattr_handlers;
2160#endif
2161 fscrypt_set_ops(sb, &ubifs_crypt_operations);
2162
2163 mutex_lock(&c->umount_mutex);
2164 err = mount_ubifs(c);
2165 if (err) {
2166 ubifs_assert(c, err < 0);
2167 goto out_unlock;
2168 }
2169
2170
2171 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2172 if (IS_ERR(root)) {
2173 err = PTR_ERR(root);
2174 goto out_umount;
2175 }
2176
2177 sb->s_root = d_make_root(root);
2178 if (!sb->s_root) {
2179 err = -ENOMEM;
2180 goto out_umount;
2181 }
2182
2183 mutex_unlock(&c->umount_mutex);
2184 return 0;
2185
2186out_umount:
2187 ubifs_umount(c);
2188out_unlock:
2189 mutex_unlock(&c->umount_mutex);
2190out_close:
2191 ubi_close_volume(c->ubi);
2192out:
2193 return err;
2194}
2195
2196static int sb_test(struct super_block *sb, void *data)
2197{
2198 struct ubifs_info *c1 = data;
2199 struct ubifs_info *c = sb->s_fs_info;
2200
2201 return c->vi.cdev == c1->vi.cdev;
2202}
2203
2204static int sb_set(struct super_block *sb, void *data)
2205{
2206 sb->s_fs_info = data;
2207 return set_anon_super(sb, NULL);
2208}
2209
2210static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2211 const char *name, void *data)
2212{
2213 struct ubi_volume_desc *ubi;
2214 struct ubifs_info *c;
2215 struct super_block *sb;
2216 int err;
2217
2218 dbg_gen("name %s, flags %#x", name, flags);
2219
2220
2221
2222
2223
2224
2225 ubi = open_ubi(name, UBI_READONLY);
2226 if (IS_ERR(ubi)) {
2227 if (!(flags & SB_SILENT))
2228 pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
2229 current->pid, name, (int)PTR_ERR(ubi));
2230 return ERR_CAST(ubi);
2231 }
2232
2233 c = alloc_ubifs_info(ubi);
2234 if (!c) {
2235 err = -ENOMEM;
2236 goto out_close;
2237 }
2238
2239 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2240
2241 sb = sget(fs_type, sb_test, sb_set, flags, c);
2242 if (IS_ERR(sb)) {
2243 err = PTR_ERR(sb);
2244 kfree(c);
2245 goto out_close;
2246 }
2247
2248 if (sb->s_root) {
2249 struct ubifs_info *c1 = sb->s_fs_info;
2250 kfree(c);
2251
2252 dbg_gen("this ubi volume is already mounted");
2253 if (!!(flags & SB_RDONLY) != c1->ro_mount) {
2254 err = -EBUSY;
2255 goto out_deact;
2256 }
2257 } else {
2258 err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
2259 if (err)
2260 goto out_deact;
2261
2262 sb->s_flags |= SB_ACTIVE;
2263 if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))
2264 ubifs_msg(c, "full atime support is enabled.");
2265 else
2266 sb->s_flags |= SB_NOATIME;
2267 }
2268
2269
2270 ubi_close_volume(ubi);
2271
2272 return dget(sb->s_root);
2273
2274out_deact:
2275 deactivate_locked_super(sb);
2276out_close:
2277 ubi_close_volume(ubi);
2278 return ERR_PTR(err);
2279}
2280
2281static void kill_ubifs_super(struct super_block *s)
2282{
2283 struct ubifs_info *c = s->s_fs_info;
2284 kill_anon_super(s);
2285 kfree(c);
2286}
2287
2288static struct file_system_type ubifs_fs_type = {
2289 .name = "ubifs",
2290 .owner = THIS_MODULE,
2291 .mount = ubifs_mount,
2292 .kill_sb = kill_ubifs_super,
2293};
2294MODULE_ALIAS_FS("ubifs");
2295
2296
2297
2298
2299static void inode_slab_ctor(void *obj)
2300{
2301 struct ubifs_inode *ui = obj;
2302 inode_init_once(&ui->vfs_inode);
2303}
2304
2305static int __init ubifs_init(void)
2306{
2307 int err;
2308
2309 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2310
2311
2312 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2313 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2314 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2315 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2316 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2317 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2318 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2319 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2320 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2321 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2322 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2323
2324 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2325 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2326 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2327 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2328 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2329 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2330
2331
2332 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2333 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2334 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2335 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2336
2337 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2338 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2339 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2340 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2341
2342
2343 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2344 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2345 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2346 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2347
2348
2349
2350
2351
2352
2353
2354 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2355
2356
2357
2358
2359
2360 if (PAGE_SIZE < UBIFS_BLOCK_SIZE) {
2361 pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2362 current->pid, (unsigned int)PAGE_SIZE);
2363 return -EINVAL;
2364 }
2365
2366 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2367 sizeof(struct ubifs_inode), 0,
2368 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT |
2369 SLAB_ACCOUNT, &inode_slab_ctor);
2370 if (!ubifs_inode_slab)
2371 return -ENOMEM;
2372
2373 err = register_shrinker(&ubifs_shrinker_info);
2374 if (err)
2375 goto out_slab;
2376
2377 err = ubifs_compressors_init();
2378 if (err)
2379 goto out_shrinker;
2380
2381 dbg_debugfs_init();
2382
2383 err = register_filesystem(&ubifs_fs_type);
2384 if (err) {
2385 pr_err("UBIFS error (pid %d): cannot register file system, error %d",
2386 current->pid, err);
2387 goto out_dbg;
2388 }
2389 return 0;
2390
2391out_dbg:
2392 dbg_debugfs_exit();
2393 ubifs_compressors_exit();
2394out_shrinker:
2395 unregister_shrinker(&ubifs_shrinker_info);
2396out_slab:
2397 kmem_cache_destroy(ubifs_inode_slab);
2398 return err;
2399}
2400
2401late_initcall(ubifs_init);
2402
2403static void __exit ubifs_exit(void)
2404{
2405 WARN_ON(!list_empty(&ubifs_infos));
2406 WARN_ON(atomic_long_read(&ubifs_clean_zn_cnt) != 0);
2407
2408 dbg_debugfs_exit();
2409 ubifs_compressors_exit();
2410 unregister_shrinker(&ubifs_shrinker_info);
2411
2412
2413
2414
2415
2416 rcu_barrier();
2417 kmem_cache_destroy(ubifs_inode_slab);
2418 unregister_filesystem(&ubifs_fs_type);
2419}
2420module_exit(ubifs_exit);
2421
2422MODULE_LICENSE("GPL");
2423MODULE_VERSION(__stringify(UBIFS_VERSION));
2424MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2425MODULE_DESCRIPTION("UBIFS - UBI File System");
2426