blob: ddc0f6ae65e9992af3dc689ad61021e86c5e40a1 [file] [log] [blame]
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001/*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
20 * Adrian Hunter
21 */
22
23/*
24 * This file implements UBIFS initialization and VFS superblock operations. Some
25 * initialization stuff which is rather large and complex is placed at
26 * corresponding subsystems, but most of it is here.
27 */
28
29#include <linux/init.h>
30#include <linux/slab.h>
31#include <linux/module.h>
32#include <linux/ctype.h>
Artem Bityutskiy1e517642008-07-14 19:08:37 +030033#include <linux/kthread.h>
34#include <linux/parser.h>
35#include <linux/seq_file.h>
36#include <linux/mount.h>
Artem Bityutskiy4d61db42008-12-18 14:06:51 +020037#include <linux/math64.h>
Artem Bityutskiy304d4272008-12-28 08:04:17 +020038#include <linux/writeback.h>
Artem Bityutskiy1e517642008-07-14 19:08:37 +030039#include "ubifs.h"
40
Artem Bityutskiy39ce81c2008-11-18 18:09:49 +020041/*
42 * Maximum amount of memory we may 'kmalloc()' without worrying that we are
43 * allocating too much.
44 */
45#define UBIFS_KMALLOC_OK (128*1024)
46
Artem Bityutskiy1e517642008-07-14 19:08:37 +030047/* Slab cache for UBIFS inodes */
48struct kmem_cache *ubifs_inode_slab;
49
50/* UBIFS TNC shrinker description */
51static struct shrinker ubifs_shrinker_info = {
52 .shrink = ubifs_shrinker,
53 .seeks = DEFAULT_SEEKS,
54};
55
56/**
57 * validate_inode - validate inode.
58 * @c: UBIFS file-system description object
59 * @inode: the inode to validate
60 *
61 * This is a helper function for 'ubifs_iget()' which validates various fields
62 * of a newly built inode to make sure they contain sane values and prevent
63 * possible vulnerabilities. Returns zero if the inode is all right and
64 * a non-zero error code if not.
65 */
66static int validate_inode(struct ubifs_info *c, const struct inode *inode)
67{
68 int err;
69 const struct ubifs_inode *ui = ubifs_inode(inode);
70
71 if (inode->i_size > c->max_inode_sz) {
72 ubifs_err("inode is too large (%lld)",
73 (long long)inode->i_size);
74 return 1;
75 }
76
77 if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) {
78 ubifs_err("unknown compression type %d", ui->compr_type);
79 return 2;
80 }
81
82 if (ui->xattr_names + ui->xattr_cnt > XATTR_LIST_MAX)
83 return 3;
84
85 if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA)
86 return 4;
87
Artem Bityutskiya29fa9d2011-05-26 09:43:34 +030088 if (ui->xattr && !S_ISREG(inode->i_mode))
Artem Bityutskiy1e517642008-07-14 19:08:37 +030089 return 5;
90
91 if (!ubifs_compr_present(ui->compr_type)) {
Artem Bityutskiy79fda512012-08-27 13:34:09 +030092 ubifs_warn("inode %lu uses '%s' compression, but it was not compiled in",
93 inode->i_ino, ubifs_compr_name(ui->compr_type));
Artem Bityutskiy1e517642008-07-14 19:08:37 +030094 }
95
Artem Bityutskiy1b51e982011-05-25 17:38:29 +030096 err = dbg_check_dir(c, inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +030097 return err;
98}
99
100struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
101{
102 int err;
103 union ubifs_key key;
104 struct ubifs_ino_node *ino;
105 struct ubifs_info *c = sb->s_fs_info;
106 struct inode *inode;
107 struct ubifs_inode *ui;
108
109 dbg_gen("inode %lu", inum);
110
111 inode = iget_locked(sb, inum);
112 if (!inode)
113 return ERR_PTR(-ENOMEM);
114 if (!(inode->i_state & I_NEW))
115 return inode;
116 ui = ubifs_inode(inode);
117
118 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
119 if (!ino) {
120 err = -ENOMEM;
121 goto out;
122 }
123
124 ino_key_init(c, &key, inode->i_ino);
125
126 err = ubifs_tnc_lookup(c, &key, ino);
127 if (err)
128 goto out_ino;
129
130 inode->i_flags |= (S_NOCMTIME | S_NOATIME);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200131 set_nlink(inode, le32_to_cpu(ino->nlink));
Eric W. Biederman39241be2012-02-07 15:50:56 -0800132 i_uid_write(inode, le32_to_cpu(ino->uid));
133 i_gid_write(inode, le32_to_cpu(ino->gid));
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300134 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
135 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
136 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
137 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
138 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
139 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
140 inode->i_mode = le32_to_cpu(ino->mode);
141 inode->i_size = le64_to_cpu(ino->size);
142
143 ui->data_len = le32_to_cpu(ino->data_len);
144 ui->flags = le32_to_cpu(ino->flags);
145 ui->compr_type = le16_to_cpu(ino->compr_type);
146 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
147 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
148 ui->xattr_size = le32_to_cpu(ino->xattr_size);
149 ui->xattr_names = le32_to_cpu(ino->xattr_names);
150 ui->synced_i_size = ui->ui_size = inode->i_size;
151
152 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
153
154 err = validate_inode(c, inode);
155 if (err)
156 goto out_invalid;
157
Artem Bityutskiy0a883a02008-08-13 14:13:26 +0300158 /* Disable read-ahead */
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300159 inode->i_mapping->backing_dev_info = &c->bdi;
160
161 switch (inode->i_mode & S_IFMT) {
162 case S_IFREG:
163 inode->i_mapping->a_ops = &ubifs_file_address_operations;
164 inode->i_op = &ubifs_file_inode_operations;
165 inode->i_fop = &ubifs_file_operations;
166 if (ui->xattr) {
167 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
168 if (!ui->data) {
169 err = -ENOMEM;
170 goto out_ino;
171 }
172 memcpy(ui->data, ino->data, ui->data_len);
173 ((char *)ui->data)[ui->data_len] = '\0';
174 } else if (ui->data_len != 0) {
175 err = 10;
176 goto out_invalid;
177 }
178 break;
179 case S_IFDIR:
180 inode->i_op = &ubifs_dir_inode_operations;
181 inode->i_fop = &ubifs_dir_operations;
182 if (ui->data_len != 0) {
183 err = 11;
184 goto out_invalid;
185 }
186 break;
187 case S_IFLNK:
188 inode->i_op = &ubifs_symlink_inode_operations;
189 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
190 err = 12;
191 goto out_invalid;
192 }
193 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
194 if (!ui->data) {
195 err = -ENOMEM;
196 goto out_ino;
197 }
198 memcpy(ui->data, ino->data, ui->data_len);
199 ((char *)ui->data)[ui->data_len] = '\0';
200 break;
201 case S_IFBLK:
202 case S_IFCHR:
203 {
204 dev_t rdev;
205 union ubifs_dev_desc *dev;
206
207 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
208 if (!ui->data) {
209 err = -ENOMEM;
210 goto out_ino;
211 }
212
213 dev = (union ubifs_dev_desc *)ino->data;
214 if (ui->data_len == sizeof(dev->new))
215 rdev = new_decode_dev(le32_to_cpu(dev->new));
216 else if (ui->data_len == sizeof(dev->huge))
217 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
218 else {
219 err = 13;
220 goto out_invalid;
221 }
222 memcpy(ui->data, ino->data, ui->data_len);
223 inode->i_op = &ubifs_file_inode_operations;
224 init_special_inode(inode, inode->i_mode, rdev);
225 break;
226 }
227 case S_IFSOCK:
228 case S_IFIFO:
229 inode->i_op = &ubifs_file_inode_operations;
230 init_special_inode(inode, inode->i_mode, 0);
231 if (ui->data_len != 0) {
232 err = 14;
233 goto out_invalid;
234 }
235 break;
236 default:
237 err = 15;
238 goto out_invalid;
239 }
240
241 kfree(ino);
242 ubifs_set_inode_flags(inode);
243 unlock_new_inode(inode);
244 return inode;
245
246out_invalid:
247 ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err);
Artem Bityutskiyedf6be22012-05-16 19:15:56 +0300248 ubifs_dump_node(c, ino);
249 ubifs_dump_inode(c, inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300250 err = -EINVAL;
251out_ino:
252 kfree(ino);
253out:
254 ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err);
255 iget_failed(inode);
256 return ERR_PTR(err);
257}
258
259static struct inode *ubifs_alloc_inode(struct super_block *sb)
260{
261 struct ubifs_inode *ui;
262
263 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
264 if (!ui)
265 return NULL;
266
267 memset((void *)ui + sizeof(struct inode), 0,
268 sizeof(struct ubifs_inode) - sizeof(struct inode));
269 mutex_init(&ui->ui_mutex);
270 spin_lock_init(&ui->ui_lock);
271 return &ui->vfs_inode;
272};
273
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100274static void ubifs_i_callback(struct rcu_head *head)
275{
276 struct inode *inode = container_of(head, struct inode, i_rcu);
277 struct ubifs_inode *ui = ubifs_inode(inode);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100278 kmem_cache_free(ubifs_inode_slab, ui);
279}
280
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300281static void ubifs_destroy_inode(struct inode *inode)
282{
283 struct ubifs_inode *ui = ubifs_inode(inode);
284
285 kfree(ui->data);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100286 call_rcu(&inode->i_rcu, ubifs_i_callback);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300287}
288
289/*
290 * Note, Linux write-back code calls this without 'i_mutex'.
291 */
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100292static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300293{
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300294 int err = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300295 struct ubifs_info *c = inode->i_sb->s_fs_info;
296 struct ubifs_inode *ui = ubifs_inode(inode);
297
298 ubifs_assert(!ui->xattr);
299 if (is_bad_inode(inode))
300 return 0;
301
302 mutex_lock(&ui->ui_mutex);
303 /*
304 * Due to races between write-back forced by budgeting
Artem Bityutskiy5c57f202012-07-25 18:12:14 +0300305 * (see 'sync_some_inodes()') and background write-back, the inode may
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300306 * have already been synchronized, do not do this again. This might
307 * also happen if it was synchronized in an VFS operation, e.g.
308 * 'ubifs_link()'.
309 */
310 if (!ui->dirty) {
311 mutex_unlock(&ui->ui_mutex);
312 return 0;
313 }
314
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300315 /*
316 * As an optimization, do not write orphan inodes to the media just
317 * because this is not needed.
318 */
319 dbg_gen("inode %lu, mode %#x, nlink %u",
320 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
321 if (inode->i_nlink) {
Artem Bityutskiy1f286812008-07-22 12:06:13 +0300322 err = ubifs_jnl_write_inode(c, inode);
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300323 if (err)
324 ubifs_err("can't write inode %lu, error %d",
325 inode->i_ino, err);
Artem Bityutskiye3c3efc2009-08-27 16:34:19 +0300326 else
327 err = dbg_check_inode_size(c, inode, ui->ui_size);
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300328 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300329
330 ui->dirty = 0;
331 mutex_unlock(&ui->ui_mutex);
332 ubifs_release_dirty_inode_budget(c, ui);
333 return err;
334}
335
Al Virod640e1b2010-06-07 00:34:05 -0400336static void ubifs_evict_inode(struct inode *inode)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300337{
338 int err;
339 struct ubifs_info *c = inode->i_sb->s_fs_info;
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300340 struct ubifs_inode *ui = ubifs_inode(inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300341
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300342 if (ui->xattr)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300343 /*
344 * Extended attribute inode deletions are fully handled in
345 * 'ubifs_removexattr()'. These inodes are special and have
346 * limited usage, so there is nothing to do here.
347 */
348 goto out;
349
Artem Bityutskiy7d32c2b2008-07-18 18:54:29 +0300350 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300351 ubifs_assert(!atomic_read(&inode->i_count));
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300352
353 truncate_inode_pages(&inode->i_data, 0);
Al Virod640e1b2010-06-07 00:34:05 -0400354
355 if (inode->i_nlink)
356 goto done;
357
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300358 if (is_bad_inode(inode))
359 goto out;
360
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300361 ui->ui_size = inode->i_size = 0;
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300362 err = ubifs_jnl_delete_inode(c, inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300363 if (err)
364 /*
365 * Worst case we have a lost orphan inode wasting space, so a
Artem Bityutskiy0a883a02008-08-13 14:13:26 +0300366 * simple error message is OK here.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300367 */
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300368 ubifs_err("can't delete inode %lu, error %d",
369 inode->i_ino, err);
370
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300371out:
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300372 if (ui->dirty)
373 ubifs_release_dirty_inode_budget(c, ui);
Adrian Hunter6d6cb0d2009-04-08 14:07:57 +0200374 else {
375 /* We've deleted something - clean the "no space" flags */
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300376 c->bi.nospace = c->bi.nospace_rp = 0;
Adrian Hunter6d6cb0d2009-04-08 14:07:57 +0200377 smp_wmb();
378 }
Al Virod640e1b2010-06-07 00:34:05 -0400379done:
Jan Karadbd57682012-05-03 14:48:02 +0200380 clear_inode(inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300381}
382
Christoph Hellwigaa385722011-05-27 06:53:02 -0400383static void ubifs_dirty_inode(struct inode *inode, int flags)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300384{
385 struct ubifs_inode *ui = ubifs_inode(inode);
386
387 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
388 if (!ui->dirty) {
389 ui->dirty = 1;
390 dbg_gen("inode %lu", inode->i_ino);
391 }
392}
393
394static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
395{
396 struct ubifs_info *c = dentry->d_sb->s_fs_info;
397 unsigned long long free;
Artem Bityutskiy7c7cbad2008-09-03 14:16:42 +0300398 __le32 *uuid = (__le32 *)c->uuid;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300399
Artem Bityutskiy7dad1812008-08-25 18:58:19 +0300400 free = ubifs_get_free_space(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300401 dbg_gen("free space %lld bytes (%lld blocks)",
402 free, free >> UBIFS_BLOCK_SHIFT);
403
404 buf->f_type = UBIFS_SUPER_MAGIC;
405 buf->f_bsize = UBIFS_BLOCK_SIZE;
406 buf->f_blocks = c->block_cnt;
407 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
408 if (free > c->report_rp_size)
409 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
410 else
411 buf->f_bavail = 0;
412 buf->f_files = 0;
413 buf->f_ffree = 0;
414 buf->f_namelen = UBIFS_MAX_NLEN;
Artem Bityutskiy7c7cbad2008-09-03 14:16:42 +0300415 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
416 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
Artem Bityutskiyb4978e92009-01-23 18:23:03 +0200417 ubifs_assert(buf->f_bfree <= c->block_cnt);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300418 return 0;
419}
420
Al Viro34c80b12011-12-08 21:32:45 -0500421static int ubifs_show_options(struct seq_file *s, struct dentry *root)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300422{
Al Viro34c80b12011-12-08 21:32:45 -0500423 struct ubifs_info *c = root->d_sb->s_fs_info;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300424
425 if (c->mount_opts.unmount_mode == 2)
426 seq_printf(s, ",fast_unmount");
427 else if (c->mount_opts.unmount_mode == 1)
428 seq_printf(s, ",norm_unmount");
429
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300430 if (c->mount_opts.bulk_read == 2)
431 seq_printf(s, ",bulk_read");
432 else if (c->mount_opts.bulk_read == 1)
433 seq_printf(s, ",no_bulk_read");
434
Adrian Hunter2953e732008-09-04 16:26:00 +0300435 if (c->mount_opts.chk_data_crc == 2)
436 seq_printf(s, ",chk_data_crc");
437 else if (c->mount_opts.chk_data_crc == 1)
438 seq_printf(s, ",no_chk_data_crc");
439
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200440 if (c->mount_opts.override_compr) {
Hunter Adrianfcabb342009-03-18 12:29:39 +0100441 seq_printf(s, ",compr=%s",
442 ubifs_compr_name(c->mount_opts.compr_type));
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200443 }
444
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300445 return 0;
446}
447
448static int ubifs_sync_fs(struct super_block *sb, int wait)
449{
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200450 int i, err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300451 struct ubifs_info *c = sb->s_fs_info;
Artem Bityutskiy304d4272008-12-28 08:04:17 +0200452
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800453 /*
Artem Bityutskiydedb0d42009-01-09 21:02:37 +0200454 * Zero @wait is just an advisory thing to help the file system shove
455 * lots of data into the queues, and there will be the second
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800456 * '->sync_fs()' call, with non-zero @wait.
457 */
Artem Bityutskiydedb0d42009-01-09 21:02:37 +0200458 if (!wait)
459 return 0;
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800460
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200461 /*
Adrian Hunter3eb14292009-01-29 11:17:24 +0200462 * Synchronize write buffers, because 'ubifs_run_commit()' does not
463 * do this if it waits for an already running commit.
464 */
465 for (i = 0; i < c->jhead_cnt; i++) {
466 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
467 if (err)
468 return err;
469 }
470
Artem Bityutskiy887ee172009-07-20 17:56:19 +0300471 /*
472 * Strictly speaking, it is not necessary to commit the journal here,
473 * synchronizing write-buffers would be enough. But committing makes
474 * UBIFS free space predictions much more accurate, so we want to let
475 * the user be able to get more accurate results of 'statfs()' after
476 * they synchronize the file system.
477 */
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200478 err = ubifs_run_commit(c);
479 if (err)
480 return err;
Artem Bityutskiy403e12a2008-09-09 12:31:37 +0300481
Artem Bityutskiycb5c6a22008-12-28 08:18:43 +0200482 return ubi_sync(c->vi.ubi_num);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300483}
484
485/**
486 * init_constants_early - initialize UBIFS constants.
487 * @c: UBIFS file-system description object
488 *
489 * This function initialize UBIFS constants which do not need the superblock to
490 * be read. It also checks that the UBI volume satisfies basic UBIFS
491 * requirements. Returns zero in case of success and a negative error code in
492 * case of failure.
493 */
494static int init_constants_early(struct ubifs_info *c)
495{
496 if (c->vi.corrupted) {
497 ubifs_warn("UBI volume is corrupted - read-only mode");
498 c->ro_media = 1;
499 }
500
501 if (c->di.ro_mode) {
502 ubifs_msg("read-only UBI device");
503 c->ro_media = 1;
504 }
505
506 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
507 ubifs_msg("static UBI volume - read-only mode");
508 c->ro_media = 1;
509 }
510
511 c->leb_cnt = c->vi.size;
512 c->leb_size = c->vi.usable_leb_size;
Artem Bityutskiyca2ec612011-02-14 15:17:55 +0200513 c->leb_start = c->di.leb_start;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300514 c->half_leb_size = c->leb_size / 2;
515 c->min_io_size = c->di.min_io_size;
516 c->min_io_shift = fls(c->min_io_size) - 1;
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +0200517 c->max_write_size = c->di.max_write_size;
518 c->max_write_shift = fls(c->max_write_size) - 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300519
520 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
521 ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
522 c->leb_size, UBIFS_MIN_LEB_SZ);
523 return -EINVAL;
524 }
525
526 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
527 ubifs_err("too few LEBs (%d), min. is %d",
528 c->leb_cnt, UBIFS_MIN_LEB_CNT);
529 return -EINVAL;
530 }
531
532 if (!is_power_of_2(c->min_io_size)) {
533 ubifs_err("bad min. I/O size %d", c->min_io_size);
534 return -EINVAL;
535 }
536
537 /*
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +0200538 * Maximum write size has to be greater or equivalent to min. I/O
539 * size, and be multiple of min. I/O size.
540 */
541 if (c->max_write_size < c->min_io_size ||
542 c->max_write_size % c->min_io_size ||
543 !is_power_of_2(c->max_write_size)) {
544 ubifs_err("bad write buffer size %d for %d min. I/O unit",
545 c->max_write_size, c->min_io_size);
546 return -EINVAL;
547 }
548
549 /*
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300550 * UBIFS aligns all node to 8-byte boundary, so to make function in
551 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
552 * less than 8.
553 */
554 if (c->min_io_size < 8) {
555 c->min_io_size = 8;
556 c->min_io_shift = 3;
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +0200557 if (c->max_write_size < c->min_io_size) {
558 c->max_write_size = c->min_io_size;
559 c->max_write_shift = c->min_io_shift;
560 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300561 }
562
563 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
564 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
565
566 /*
567 * Initialize node length ranges which are mostly needed for node
568 * length validation.
569 */
570 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
571 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
572 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
573 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
574 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
575 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
576
577 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
578 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
579 c->ranges[UBIFS_ORPH_NODE].min_len =
580 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
581 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
582 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
583 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
584 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
585 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
586 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
587 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
588 /*
589 * Minimum indexing node size is amended later when superblock is
590 * read and the key length is known.
591 */
592 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
593 /*
594 * Maximum indexing node size is amended later when superblock is
595 * read and the fanout is known.
596 */
597 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
598
599 /*
Artem Bityutskiy70782022009-01-19 19:57:27 +0200600 * Initialize dead and dark LEB space watermarks. See gc.c for comments
601 * about these values.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300602 */
603 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
604 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
605
Artem Bityutskiy9bbb5722008-08-22 18:23:22 +0300606 /*
607 * Calculate how many bytes would be wasted at the end of LEB if it was
608 * fully filled with data nodes of maximum size. This is used in
609 * calculations when reporting free space.
610 */
611 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
Artem Bityutskiy39ce81c2008-11-18 18:09:49 +0200612
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300613 /* Buffer size for bulk-reads */
Artem Bityutskiy6c0c42c2008-11-18 20:20:05 +0200614 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
615 if (c->max_bu_buf_len > c->leb_size)
616 c->max_bu_buf_len = c->leb_size;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300617 return 0;
618}
619
620/**
621 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
622 * @c: UBIFS file-system description object
623 * @lnum: LEB the write-buffer was synchronized to
624 * @free: how many free bytes left in this LEB
625 * @pad: how many bytes were padded
626 *
627 * This is a callback function which is called by the I/O unit when the
628 * write-buffer is synchronized. We need this to correctly maintain space
629 * accounting in bud logical eraseblocks. This function returns zero in case of
630 * success and a negative error code in case of failure.
631 *
632 * This function actually belongs to the journal, but we keep it here because
633 * we want to keep it static.
634 */
635static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
636{
637 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
638}
639
640/*
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200641 * init_constants_sb - initialize UBIFS constants.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300642 * @c: UBIFS file-system description object
643 *
644 * This is a helper function which initializes various UBIFS constants after
645 * the superblock has been read. It also checks various UBIFS parameters and
646 * makes sure they are all right. Returns zero in case of success and a
647 * negative error code in case of failure.
648 */
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200649static int init_constants_sb(struct ubifs_info *c)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300650{
651 int tmp, err;
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200652 long long tmp64;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300653
654 c->main_bytes = (long long)c->main_lebs * c->leb_size;
655 c->max_znode_sz = sizeof(struct ubifs_znode) +
656 c->fanout * sizeof(struct ubifs_zbranch);
657
658 tmp = ubifs_idx_node_sz(c, 1);
659 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
660 c->min_idx_node_sz = ALIGN(tmp, 8);
661
662 tmp = ubifs_idx_node_sz(c, c->fanout);
663 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
664 c->max_idx_node_sz = ALIGN(tmp, 8);
665
666 /* Make sure LEB size is large enough to fit full commit */
667 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
668 tmp = ALIGN(tmp, c->min_io_size);
669 if (tmp > c->leb_size) {
Artem Bityutskiya6aae4d2012-05-16 20:11:23 +0300670 ubifs_err("too small LEB size %d, at least %d needed",
671 c->leb_size, tmp);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300672 return -EINVAL;
673 }
674
675 /*
676 * Make sure that the log is large enough to fit reference nodes for
677 * all buds plus one reserved LEB.
678 */
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200679 tmp64 = c->max_bud_bytes + c->leb_size - 1;
680 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300681 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
682 tmp /= c->leb_size;
683 tmp += 1;
684 if (c->log_lebs < tmp) {
Artem Bityutskiya6aae4d2012-05-16 20:11:23 +0300685 ubifs_err("too small log %d LEBs, required min. %d LEBs",
686 c->log_lebs, tmp);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300687 return -EINVAL;
688 }
689
690 /*
691 * When budgeting we assume worst-case scenarios when the pages are not
692 * be compressed and direntries are of the maximum size.
693 *
694 * Note, data, which may be stored in inodes is budgeted separately, so
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300695 * it is not included into 'c->bi.inode_budget'.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300696 */
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300697 c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
698 c->bi.inode_budget = UBIFS_INO_NODE_SZ;
699 c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300700
701 /*
702 * When the amount of flash space used by buds becomes
703 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
704 * The writers are unblocked when the commit is finished. To avoid
705 * writers to be blocked UBIFS initiates background commit in advance,
706 * when number of bud bytes becomes above the limit defined below.
707 */
708 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
709
710 /*
711 * Ensure minimum journal size. All the bytes in the journal heads are
712 * considered to be used, when calculating the current journal usage.
713 * Consequently, if the journal is too small, UBIFS will treat it as
714 * always full.
715 */
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200716 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300717 if (c->bg_bud_bytes < tmp64)
718 c->bg_bud_bytes = tmp64;
719 if (c->max_bud_bytes < tmp64 + c->leb_size)
720 c->max_bud_bytes = tmp64 + c->leb_size;
721
722 err = ubifs_calc_lpt_geom(c);
723 if (err)
724 return err;
725
Artem Bityutskiyfb1cd012009-03-16 09:56:57 +0200726 /* Initialize effective LEB size used in budgeting calculations */
727 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200728 return 0;
729}
730
731/*
732 * init_constants_master - initialize UBIFS constants.
733 * @c: UBIFS file-system description object
734 *
735 * This is a helper function which initializes various UBIFS constants after
736 * the master node has been read. It also checks various UBIFS parameters and
737 * makes sure they are all right.
738 */
739static void init_constants_master(struct ubifs_info *c)
740{
741 long long tmp64;
742
Artem Bityutskiyb1375452011-03-29 18:04:05 +0300743 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
Artem Bityutskiyfb1cd012009-03-16 09:56:57 +0200744 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300745
746 /*
747 * Calculate total amount of FS blocks. This number is not used
748 * internally because it does not make much sense for UBIFS, but it is
749 * necessary to report something for the 'statfs()' call.
750 *
Artem Bityutskiy7dad1812008-08-25 18:58:19 +0300751 * Subtract the LEB reserved for GC, the LEB which is reserved for
Artem Bityutskiyaf14a1a2008-12-19 19:26:29 +0200752 * deletions, minimum LEBs for the index, and assume only one journal
753 * head is available.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300754 */
Artem Bityutskiyaf14a1a2008-12-19 19:26:29 +0200755 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200756 tmp64 *= (long long)c->leb_size - c->leb_overhead;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300757 tmp64 = ubifs_reported_space(c, tmp64);
758 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300759}
760
761/**
762 * take_gc_lnum - reserve GC LEB.
763 * @c: UBIFS file-system description object
764 *
Artem Bityutskiyb4978e92009-01-23 18:23:03 +0200765 * This function ensures that the LEB reserved for garbage collection is marked
766 * as "taken" in lprops. We also have to set free space to LEB size and dirty
767 * space to zero, because lprops may contain out-of-date information if the
768 * file-system was un-mounted before it has been committed. This function
769 * returns zero in case of success and a negative error code in case of
770 * failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300771 */
772static int take_gc_lnum(struct ubifs_info *c)
773{
774 int err;
775
776 if (c->gc_lnum == -1) {
777 ubifs_err("no LEB for GC");
778 return -EINVAL;
779 }
780
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300781 /* And we have to tell lprops that this LEB is taken */
782 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
783 LPROPS_TAKEN, 0, 0);
784 return err;
785}
786
787/**
788 * alloc_wbufs - allocate write-buffers.
789 * @c: UBIFS file-system description object
790 *
791 * This helper function allocates and initializes UBIFS write-buffers. Returns
792 * zero in case of success and %-ENOMEM in case of failure.
793 */
794static int alloc_wbufs(struct ubifs_info *c)
795{
796 int i, err;
797
798 c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead),
799 GFP_KERNEL);
800 if (!c->jheads)
801 return -ENOMEM;
802
803 /* Initialize journal heads */
804 for (i = 0; i < c->jhead_cnt; i++) {
805 INIT_LIST_HEAD(&c->jheads[i].buds_list);
806 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
807 if (err)
808 return err;
809
810 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
811 c->jheads[i].wbuf.jhead = i;
Artem Bityutskiy1a0b0692011-05-26 08:26:05 +0300812 c->jheads[i].grouped = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300813 }
814
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300815 /*
Artem Bityutskiy44156262012-05-14 19:49:35 +0300816 * Garbage Collector head does not need to be synchronized by timer.
817 * Also GC head nodes are not grouped.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300818 */
Artem Bityutskiy0b335b92009-06-23 12:30:43 +0300819 c->jheads[GCHD].wbuf.no_timer = 1;
Artem Bityutskiy1a0b0692011-05-26 08:26:05 +0300820 c->jheads[GCHD].grouped = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300821
822 return 0;
823}
824
825/**
826 * free_wbufs - free write-buffers.
827 * @c: UBIFS file-system description object
828 */
829static void free_wbufs(struct ubifs_info *c)
830{
831 int i;
832
833 if (c->jheads) {
834 for (i = 0; i < c->jhead_cnt; i++) {
835 kfree(c->jheads[i].wbuf.buf);
836 kfree(c->jheads[i].wbuf.inodes);
837 }
838 kfree(c->jheads);
839 c->jheads = NULL;
840 }
841}
842
843/**
844 * free_orphans - free orphans.
845 * @c: UBIFS file-system description object
846 */
847static void free_orphans(struct ubifs_info *c)
848{
849 struct ubifs_orphan *orph;
850
851 while (c->orph_dnext) {
852 orph = c->orph_dnext;
853 c->orph_dnext = orph->dnext;
854 list_del(&orph->list);
855 kfree(orph);
856 }
857
858 while (!list_empty(&c->orph_list)) {
859 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
860 list_del(&orph->list);
861 kfree(orph);
Artem Bityutskiya6aae4d2012-05-16 20:11:23 +0300862 ubifs_err("orphan list not empty at unmount");
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300863 }
864
865 vfree(c->orph_buf);
866 c->orph_buf = NULL;
867}
868
869/**
870 * free_buds - free per-bud objects.
871 * @c: UBIFS file-system description object
872 */
873static void free_buds(struct ubifs_info *c)
874{
875 struct rb_node *this = c->buds.rb_node;
876 struct ubifs_bud *bud;
877
878 while (this) {
879 if (this->rb_left)
880 this = this->rb_left;
881 else if (this->rb_right)
882 this = this->rb_right;
883 else {
884 bud = rb_entry(this, struct ubifs_bud, rb);
885 this = rb_parent(this);
886 if (this) {
887 if (this->rb_left == &bud->rb)
888 this->rb_left = NULL;
889 else
890 this->rb_right = NULL;
891 }
892 kfree(bud);
893 }
894 }
895}
896
897/**
898 * check_volume_empty - check if the UBI volume is empty.
899 * @c: UBIFS file-system description object
900 *
901 * This function checks if the UBIFS volume is empty by looking if its LEBs are
902 * mapped or not. The result of checking is stored in the @c->empty variable.
903 * Returns zero in case of success and a negative error code in case of
904 * failure.
905 */
906static int check_volume_empty(struct ubifs_info *c)
907{
908 int lnum, err;
909
910 c->empty = 1;
911 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
Artem Bityutskiyd3b25782011-06-03 14:22:05 +0300912 err = ubifs_is_mapped(c, lnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300913 if (unlikely(err < 0))
914 return err;
915 if (err == 1) {
916 c->empty = 0;
917 break;
918 }
919
920 cond_resched();
921 }
922
923 return 0;
924}
925
926/*
927 * UBIFS mount options.
928 *
929 * Opt_fast_unmount: do not run a journal commit before un-mounting
930 * Opt_norm_unmount: run a journal commit before un-mounting
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300931 * Opt_bulk_read: enable bulk-reads
932 * Opt_no_bulk_read: disable bulk-reads
Adrian Hunter2953e732008-09-04 16:26:00 +0300933 * Opt_chk_data_crc: check CRCs when reading data nodes
934 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200935 * Opt_override_compr: override default compressor
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300936 * Opt_err: just end of array marker
937 */
938enum {
939 Opt_fast_unmount,
940 Opt_norm_unmount,
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300941 Opt_bulk_read,
942 Opt_no_bulk_read,
Adrian Hunter2953e732008-09-04 16:26:00 +0300943 Opt_chk_data_crc,
944 Opt_no_chk_data_crc,
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200945 Opt_override_compr,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300946 Opt_err,
947};
948
Steven Whitehousea447c092008-10-13 10:46:57 +0100949static const match_table_t tokens = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300950 {Opt_fast_unmount, "fast_unmount"},
951 {Opt_norm_unmount, "norm_unmount"},
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300952 {Opt_bulk_read, "bulk_read"},
953 {Opt_no_bulk_read, "no_bulk_read"},
Adrian Hunter2953e732008-09-04 16:26:00 +0300954 {Opt_chk_data_crc, "chk_data_crc"},
955 {Opt_no_chk_data_crc, "no_chk_data_crc"},
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200956 {Opt_override_compr, "compr=%s"},
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300957 {Opt_err, NULL},
958};
959
960/**
Artem Bityutskiy8379ea32009-05-29 12:34:52 +0300961 * parse_standard_option - parse a standard mount option.
962 * @option: the option to parse
963 *
964 * Normally, standard mount options like "sync" are passed to file-systems as
965 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
966 * be present in the options string. This function tries to deal with this
967 * situation and parse standard options. Returns 0 if the option was not
968 * recognized, and the corresponding integer flag if it was.
969 *
970 * UBIFS is only interested in the "sync" option, so do not check for anything
971 * else.
972 */
973static int parse_standard_option(const char *option)
974{
975 ubifs_msg("parse %s", option);
976 if (!strcmp(option, "sync"))
977 return MS_SYNCHRONOUS;
978 return 0;
979}
980
981/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300982 * ubifs_parse_options - parse mount parameters.
983 * @c: UBIFS file-system description object
984 * @options: parameters to parse
985 * @is_remount: non-zero if this is FS re-mount
986 *
987 * This function parses UBIFS mount options and returns zero in case success
988 * and a negative error code in case of failure.
989 */
990static int ubifs_parse_options(struct ubifs_info *c, char *options,
991 int is_remount)
992{
993 char *p;
994 substring_t args[MAX_OPT_ARGS];
995
996 if (!options)
997 return 0;
998
999 while ((p = strsep(&options, ","))) {
1000 int token;
1001
1002 if (!*p)
1003 continue;
1004
1005 token = match_token(p, tokens, args);
1006 switch (token) {
Artem Bityutskiy27ad2792009-01-29 16:34:30 +02001007 /*
1008 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
Artem Bityutskiycb54ef82009-06-23 20:30:32 +03001009 * We accept them in order to be backward-compatible. But this
Artem Bityutskiy27ad2792009-01-29 16:34:30 +02001010 * should be removed at some point.
1011 */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001012 case Opt_fast_unmount:
1013 c->mount_opts.unmount_mode = 2;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001014 break;
1015 case Opt_norm_unmount:
1016 c->mount_opts.unmount_mode = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001017 break;
Adrian Hunter4793e7c2008-09-02 16:29:46 +03001018 case Opt_bulk_read:
1019 c->mount_opts.bulk_read = 2;
1020 c->bulk_read = 1;
1021 break;
1022 case Opt_no_bulk_read:
1023 c->mount_opts.bulk_read = 1;
1024 c->bulk_read = 0;
1025 break;
Adrian Hunter2953e732008-09-04 16:26:00 +03001026 case Opt_chk_data_crc:
1027 c->mount_opts.chk_data_crc = 2;
1028 c->no_chk_data_crc = 0;
1029 break;
1030 case Opt_no_chk_data_crc:
1031 c->mount_opts.chk_data_crc = 1;
1032 c->no_chk_data_crc = 1;
1033 break;
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001034 case Opt_override_compr:
1035 {
1036 char *name = match_strdup(&args[0]);
1037
1038 if (!name)
1039 return -ENOMEM;
1040 if (!strcmp(name, "none"))
1041 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1042 else if (!strcmp(name, "lzo"))
1043 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1044 else if (!strcmp(name, "zlib"))
1045 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1046 else {
1047 ubifs_err("unknown compressor \"%s\"", name);
1048 kfree(name);
1049 return -EINVAL;
1050 }
1051 kfree(name);
1052 c->mount_opts.override_compr = 1;
1053 c->default_compr = c->mount_opts.compr_type;
1054 break;
1055 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001056 default:
Artem Bityutskiy8379ea32009-05-29 12:34:52 +03001057 {
1058 unsigned long flag;
1059 struct super_block *sb = c->vfs_sb;
1060
1061 flag = parse_standard_option(p);
1062 if (!flag) {
Artem Bityutskiy79fda512012-08-27 13:34:09 +03001063 ubifs_err("unrecognized mount option \"%s\" or missing value",
1064 p);
Artem Bityutskiy8379ea32009-05-29 12:34:52 +03001065 return -EINVAL;
1066 }
1067 sb->s_flags |= flag;
1068 break;
1069 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001070 }
1071 }
1072
1073 return 0;
1074}
1075
1076/**
1077 * destroy_journal - destroy journal data structures.
1078 * @c: UBIFS file-system description object
1079 *
1080 * This function destroys journal data structures including those that may have
1081 * been created by recovery functions.
1082 */
1083static void destroy_journal(struct ubifs_info *c)
1084{
1085 while (!list_empty(&c->unclean_leb_list)) {
1086 struct ubifs_unclean_leb *ucleb;
1087
1088 ucleb = list_entry(c->unclean_leb_list.next,
1089 struct ubifs_unclean_leb, list);
1090 list_del(&ucleb->list);
1091 kfree(ucleb);
1092 }
1093 while (!list_empty(&c->old_buds)) {
1094 struct ubifs_bud *bud;
1095
1096 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1097 list_del(&bud->list);
1098 kfree(bud);
1099 }
1100 ubifs_destroy_idx_gc(c);
1101 ubifs_destroy_size_tree(c);
1102 ubifs_tnc_close(c);
1103 free_buds(c);
1104}
1105
1106/**
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001107 * bu_init - initialize bulk-read information.
1108 * @c: UBIFS file-system description object
1109 */
1110static void bu_init(struct ubifs_info *c)
1111{
1112 ubifs_assert(c->bulk_read == 1);
1113
1114 if (c->bu.buf)
1115 return; /* Already initialized */
1116
1117again:
1118 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1119 if (!c->bu.buf) {
1120 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1121 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1122 goto again;
1123 }
1124
1125 /* Just disable bulk-read */
Artem Bityutskiy79fda512012-08-27 13:34:09 +03001126 ubifs_warn("cannot allocate %d bytes of memory for bulk-read, disabling it",
1127 c->max_bu_buf_len);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001128 c->mount_opts.bulk_read = 1;
1129 c->bulk_read = 0;
1130 return;
1131 }
1132}
1133
1134/**
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001135 * check_free_space - check if there is enough free space to mount.
1136 * @c: UBIFS file-system description object
1137 *
1138 * This function makes sure UBIFS has enough free space to be mounted in
1139 * read/write mode. UBIFS must always have some free space to allow deletions.
1140 */
1141static int check_free_space(struct ubifs_info *c)
1142{
1143 ubifs_assert(c->dark_wm > 0);
1144 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
Artem Bityutskiyc4361572011-03-25 15:27:40 +02001145 ubifs_err("insufficient free space to mount in R/W mode");
Artem Bityutskiyedf6be22012-05-16 19:15:56 +03001146 ubifs_dump_budg(c, &c->bi);
1147 ubifs_dump_lprops(c);
Artem Bityutskiya2b9df32009-01-29 16:22:54 +02001148 return -ENOSPC;
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001149 }
1150 return 0;
1151}
1152
1153/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001154 * mount_ubifs - mount UBIFS file-system.
1155 * @c: UBIFS file-system description object
1156 *
1157 * This function mounts UBIFS file system. Returns zero in case of success and
1158 * a negative error code in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001159 */
1160static int mount_ubifs(struct ubifs_info *c)
1161{
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001162 int err;
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001163 long long x, y;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001164 size_t sz;
1165
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001166 c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001167 err = init_constants_early(c);
1168 if (err)
1169 return err;
1170
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001171 err = ubifs_debugging_init(c);
1172 if (err)
1173 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001174
1175 err = check_volume_empty(c);
1176 if (err)
1177 goto out_free;
1178
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001179 if (c->empty && (c->ro_mount || c->ro_media)) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001180 /*
1181 * This UBI volume is empty, and read-only, or the file system
1182 * is mounted read-only - we cannot format it.
1183 */
1184 ubifs_err("can't format empty UBI volume: read-only %s",
1185 c->ro_media ? "UBI volume" : "mount");
1186 err = -EROFS;
1187 goto out_free;
1188 }
1189
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001190 if (c->ro_media && !c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001191 ubifs_err("cannot mount read-write - read-only media");
1192 err = -EROFS;
1193 goto out_free;
1194 }
1195
1196 /*
1197 * The requirement for the buffer is that it should fit indexing B-tree
1198 * height amount of integers. We assume the height if the TNC tree will
1199 * never exceed 64.
1200 */
1201 err = -ENOMEM;
1202 c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
1203 if (!c->bottom_up_buf)
1204 goto out_free;
1205
1206 c->sbuf = vmalloc(c->leb_size);
1207 if (!c->sbuf)
1208 goto out_free;
1209
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001210 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001211 c->ileb_buf = vmalloc(c->leb_size);
1212 if (!c->ileb_buf)
1213 goto out_free;
1214 }
1215
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001216 if (c->bulk_read == 1)
1217 bu_init(c);
1218
Matthew L. Creechd8829622011-03-04 17:55:02 -05001219 if (!c->ro_mount) {
1220 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
1221 GFP_KERNEL);
1222 if (!c->write_reserve_buf)
1223 goto out_free;
1224 }
1225
Artem Bityutskiy18d1d7f2011-01-17 22:27:56 +02001226 c->mounting = 1;
Adrian Hunter2953e732008-09-04 16:26:00 +03001227
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001228 err = ubifs_read_superblock(c);
1229 if (err)
1230 goto out_free;
1231
1232 /*
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001233 * Make sure the compressor which is set as default in the superblock
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001234 * or overridden by mount options is actually compiled in.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001235 */
1236 if (!ubifs_compr_present(c->default_compr)) {
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001237 ubifs_err("'compressor \"%s\" is not compiled in",
1238 ubifs_compr_name(c->default_compr));
Corentin Chary8eec2f32009-05-25 08:49:10 +02001239 err = -ENOTSUPP;
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001240 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001241 }
1242
Artem Bityutskiy79807d02008-12-27 19:18:00 +02001243 err = init_constants_sb(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001244 if (err)
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001245 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001246
1247 sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
1248 sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
1249 c->cbuf = kmalloc(sz, GFP_NOFS);
1250 if (!c->cbuf) {
1251 err = -ENOMEM;
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001252 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001253 }
1254
Artem Bityutskiyb50b9f42011-04-25 18:17:09 +03001255 err = alloc_wbufs(c);
1256 if (err)
1257 goto out_cbuf;
1258
Sebastian Siewior0855f312008-09-09 11:17:29 +02001259 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001260 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001261 /* Create background thread */
Hunter Adrianfcabb342009-03-18 12:29:39 +01001262 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001263 if (IS_ERR(c->bgt)) {
1264 err = PTR_ERR(c->bgt);
1265 c->bgt = NULL;
1266 ubifs_err("cannot spawn \"%s\", error %d",
1267 c->bgt_name, err);
1268 goto out_wbufs;
1269 }
1270 wake_up_process(c->bgt);
1271 }
1272
1273 err = ubifs_read_master(c);
1274 if (err)
1275 goto out_master;
1276
Ben Gardiner09801192011-05-30 14:56:16 -04001277 init_constants_master(c);
1278
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001279 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1280 ubifs_msg("recovery needed");
1281 c->need_recovery = 1;
Ben Gardiner781c5712011-05-30 14:56:15 -04001282 }
1283
Ben Gardiner781c5712011-05-30 14:56:15 -04001284 if (c->need_recovery && !c->ro_mount) {
1285 err = ubifs_recover_inl_heads(c, c->sbuf);
1286 if (err)
1287 goto out_master;
1288 }
1289
1290 err = ubifs_lpt_init(c, 1, !c->ro_mount);
1291 if (err)
1292 goto out_master;
1293
Ben Gardiner09801192011-05-30 14:56:16 -04001294 if (!c->ro_mount && c->space_fixup) {
1295 err = ubifs_fixup_free_space(c);
1296 if (err)
Sidney Amani56b04e32012-05-18 14:32:37 +03001297 goto out_lpt;
Ben Gardiner09801192011-05-30 14:56:16 -04001298 }
1299
Ben Gardiner781c5712011-05-30 14:56:15 -04001300 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001301 /*
1302 * Set the "dirty" flag so that if we reboot uncleanly we
1303 * will notice this immediately on the next mount.
1304 */
1305 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1306 err = ubifs_write_master(c);
1307 if (err)
Ben Gardiner781c5712011-05-30 14:56:15 -04001308 goto out_lpt;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001309 }
1310
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001311 err = dbg_check_idx_size(c, c->bi.old_idx_sz);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001312 if (err)
1313 goto out_lpt;
1314
1315 err = ubifs_replay_journal(c);
1316 if (err)
1317 goto out_journal;
1318
Artem Bityutskiy1fb8bd02009-06-28 18:31:58 +03001319 /* Calculate 'min_idx_lebs' after journal replay */
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001320 c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c);
Artem Bityutskiy1fb8bd02009-06-28 18:31:58 +03001321
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001322 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001323 if (err)
1324 goto out_orphans;
1325
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001326 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001327 int lnum;
1328
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001329 err = check_free_space(c);
1330 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001331 goto out_orphans;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001332
1333 /* Check for enough log space */
1334 lnum = c->lhead_lnum + 1;
1335 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1336 lnum = UBIFS_LOG_LNUM;
1337 if (lnum == c->ltail_lnum) {
1338 err = ubifs_consolidate_log(c);
1339 if (err)
1340 goto out_orphans;
1341 }
1342
1343 if (c->need_recovery) {
1344 err = ubifs_recover_size(c);
1345 if (err)
1346 goto out_orphans;
1347 err = ubifs_rcvry_gc_commit(c);
Artem Bityutskiy276de5d2010-05-23 14:16:13 +03001348 if (err)
1349 goto out_orphans;
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001350 } else {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001351 err = take_gc_lnum(c);
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001352 if (err)
1353 goto out_orphans;
1354
1355 /*
1356 * GC LEB may contain garbage if there was an unclean
1357 * reboot, and it should be un-mapped.
1358 */
1359 err = ubifs_leb_unmap(c, c->gc_lnum);
1360 if (err)
Matthieu CASTETc18de722010-08-02 11:36:06 +02001361 goto out_orphans;
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001362 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001363
1364 err = dbg_check_lprops(c);
1365 if (err)
1366 goto out_orphans;
1367 } else if (c->need_recovery) {
1368 err = ubifs_recover_size(c);
1369 if (err)
1370 goto out_orphans;
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001371 } else {
1372 /*
1373 * Even if we mount read-only, we have to set space in GC LEB
1374 * to proper value because this affects UBIFS free space
1375 * reporting. We do not want to have a situation when
1376 * re-mounting from R/O to R/W changes amount of free space.
1377 */
1378 err = take_gc_lnum(c);
1379 if (err)
1380 goto out_orphans;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001381 }
1382
1383 spin_lock(&ubifs_infos_lock);
1384 list_add_tail(&c->infos_list, &ubifs_infos);
1385 spin_unlock(&ubifs_infos_lock);
1386
1387 if (c->need_recovery) {
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001388 if (c->ro_mount)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001389 ubifs_msg("recovery deferred");
1390 else {
1391 c->need_recovery = 0;
1392 ubifs_msg("recovery completed");
Artem Bityutskiyb2213372009-03-15 17:20:22 +02001393 /*
1394 * GC LEB has to be empty and taken at this point. But
1395 * the journal head LEBs may also be accounted as
1396 * "empty taken" if they are empty.
1397 */
1398 ubifs_assert(c->lst.taken_empty_lebs > 0);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001399 }
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001400 } else
Artem Bityutskiyb2213372009-03-15 17:20:22 +02001401 ubifs_assert(c->lst.taken_empty_lebs > 0);
Artem Bityutskiy552ff312008-10-23 11:49:28 +03001402
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001403 err = dbg_check_filesystem(c);
1404 if (err)
1405 goto out_infos;
1406
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001407 err = dbg_debugfs_init_fs(c);
1408 if (err)
1409 goto out_infos;
1410
Artem Bityutskiy18d1d7f2011-01-17 22:27:56 +02001411 c->mounting = 0;
Adrian Hunter2953e732008-09-04 16:26:00 +03001412
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001413 ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"%s",
1414 c->vi.ubi_num, c->vi.vol_id, c->vi.name,
1415 c->ro_mount ? ", R/O mode" : NULL);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001416 x = (long long)c->main_lebs * c->leb_size;
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001417 y = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
1418 ubifs_msg("LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1419 c->leb_size, c->leb_size >> 10, c->min_io_size,
1420 c->max_write_size);
1421 ubifs_msg("FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1422 x, x >> 20, c->main_lebs,
1423 y, y >> 20, c->log_lebs + c->max_bud_cnt);
1424 ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
1425 c->report_rp_size, c->report_rp_size >> 10);
1426 ubifs_msg("media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001427 c->fmt_version, c->ro_compat_version,
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001428 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION, c->uuid,
1429 c->big_lpt ? ", big LPT model" : ", small LPT model");
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001430
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001431 dbg_gen("default compressor: %s", ubifs_compr_name(c->default_compr));
1432 dbg_gen("data journal heads: %d",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001433 c->jhead_cnt - NONDATA_JHEADS_CNT);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001434 dbg_gen("log LEBs: %d (%d - %d)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001435 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001436 dbg_gen("LPT area LEBs: %d (%d - %d)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001437 c->lpt_lebs, c->lpt_first, c->lpt_last);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001438 dbg_gen("orphan area LEBs: %d (%d - %d)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001439 c->orph_lebs, c->orph_first, c->orph_last);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001440 dbg_gen("main area LEBs: %d (%d - %d)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001441 c->main_lebs, c->main_first, c->leb_cnt - 1);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001442 dbg_gen("index LEBs: %d", c->lst.idx_lebs);
1443 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001444 c->bi.old_idx_sz, c->bi.old_idx_sz >> 10,
1445 c->bi.old_idx_sz >> 20);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001446 dbg_gen("key hash type: %d", c->key_hash_type);
1447 dbg_gen("tree fanout: %d", c->fanout);
1448 dbg_gen("reserved GC LEB: %d", c->gc_lnum);
1449 dbg_gen("max. znode size %d", c->max_znode_sz);
1450 dbg_gen("max. index node size %d", c->max_idx_node_sz);
1451 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001452 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001453 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001454 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001455 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001456 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001457 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
Artem Bityutskiyc4361572011-03-25 15:27:40 +02001458 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
Artem Bityutskiy6342aae2011-03-08 14:26:47 +02001459 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001460 dbg_gen("dead watermark: %d", c->dead_wm);
1461 dbg_gen("dark watermark: %d", c->dark_wm);
1462 dbg_gen("LEB overhead: %d", c->leb_overhead);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001463 x = (long long)c->main_lebs * c->dark_wm;
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001464 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001465 x, x >> 10, x >> 20);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001466 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001467 c->max_bud_bytes, c->max_bud_bytes >> 10,
1468 c->max_bud_bytes >> 20);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001469 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001470 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1471 c->bg_bud_bytes >> 20);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001472 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001473 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
Artem Bityutskiy3668b702012-08-27 16:56:58 +03001474 dbg_gen("max. seq. number: %llu", c->max_sqnum);
1475 dbg_gen("commit number: %llu", c->cmt_no);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001476
1477 return 0;
1478
1479out_infos:
1480 spin_lock(&ubifs_infos_lock);
1481 list_del(&c->infos_list);
1482 spin_unlock(&ubifs_infos_lock);
1483out_orphans:
1484 free_orphans(c);
1485out_journal:
1486 destroy_journal(c);
1487out_lpt:
1488 ubifs_lpt_free(c, 0);
1489out_master:
1490 kfree(c->mst_node);
1491 kfree(c->rcvrd_mst_node);
1492 if (c->bgt)
1493 kthread_stop(c->bgt);
1494out_wbufs:
1495 free_wbufs(c);
1496out_cbuf:
1497 kfree(c->cbuf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001498out_free:
Matthew L. Creechd8829622011-03-04 17:55:02 -05001499 kfree(c->write_reserve_buf);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001500 kfree(c->bu.buf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001501 vfree(c->ileb_buf);
1502 vfree(c->sbuf);
1503 kfree(c->bottom_up_buf);
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001504 ubifs_debugging_exit(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001505 return err;
1506}
1507
1508/**
1509 * ubifs_umount - un-mount UBIFS file-system.
1510 * @c: UBIFS file-system description object
1511 *
1512 * Note, this function is called to free allocated resourced when un-mounting,
1513 * as well as free resources when an error occurred while we were half way
1514 * through mounting (error path cleanup function). So it has to make sure the
1515 * resource was actually allocated before freeing it.
1516 */
1517static void ubifs_umount(struct ubifs_info *c)
1518{
1519 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1520 c->vi.vol_id);
1521
Artem Bityutskiy552ff312008-10-23 11:49:28 +03001522 dbg_debugfs_exit_fs(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001523 spin_lock(&ubifs_infos_lock);
1524 list_del(&c->infos_list);
1525 spin_unlock(&ubifs_infos_lock);
1526
1527 if (c->bgt)
1528 kthread_stop(c->bgt);
1529
1530 destroy_journal(c);
1531 free_wbufs(c);
1532 free_orphans(c);
1533 ubifs_lpt_free(c, 0);
1534
1535 kfree(c->cbuf);
1536 kfree(c->rcvrd_mst_node);
1537 kfree(c->mst_node);
Matthew L. Creechd8829622011-03-04 17:55:02 -05001538 kfree(c->write_reserve_buf);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001539 kfree(c->bu.buf);
1540 vfree(c->ileb_buf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001541 vfree(c->sbuf);
1542 kfree(c->bottom_up_buf);
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001543 ubifs_debugging_exit(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001544}
1545
1546/**
1547 * ubifs_remount_rw - re-mount in read-write mode.
1548 * @c: UBIFS file-system description object
1549 *
1550 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1551 * mode. This function allocates the needed resources and re-mounts UBIFS in
1552 * read-write mode.
1553 */
1554static int ubifs_remount_rw(struct ubifs_info *c)
1555{
1556 int err, lnum;
1557
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001558 if (c->rw_incompat) {
1559 ubifs_err("the file-system is not R/W-compatible");
Artem Bityutskiy79fda512012-08-27 13:34:09 +03001560 ubifs_msg("on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1561 c->fmt_version, c->ro_compat_version,
1562 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001563 return -EROFS;
1564 }
1565
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001566 mutex_lock(&c->umount_mutex);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001567 dbg_save_space_info(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001568 c->remounting_rw = 1;
Artem Bityutskiyc88ac002011-03-29 09:45:21 +03001569 c->ro_mount = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001570
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001571 err = check_free_space(c);
1572 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001573 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001574
1575 if (c->old_leb_cnt != c->leb_cnt) {
1576 struct ubifs_sb_node *sup;
1577
1578 sup = ubifs_read_sb_node(c);
1579 if (IS_ERR(sup)) {
1580 err = PTR_ERR(sup);
1581 goto out;
1582 }
1583 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1584 err = ubifs_write_sb_node(c, sup);
Artem Bityutskiyeaeee242011-05-06 17:08:56 +03001585 kfree(sup);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001586 if (err)
1587 goto out;
1588 }
1589
1590 if (c->need_recovery) {
1591 ubifs_msg("completing deferred recovery");
1592 err = ubifs_write_rcvrd_mst_node(c);
1593 if (err)
1594 goto out;
1595 err = ubifs_recover_size(c);
1596 if (err)
1597 goto out;
1598 err = ubifs_clean_lebs(c, c->sbuf);
1599 if (err)
1600 goto out;
1601 err = ubifs_recover_inl_heads(c, c->sbuf);
1602 if (err)
1603 goto out;
Adrian Hunter49d128a2009-01-26 10:55:40 +02001604 } else {
1605 /* A readonly mount is not allowed to have orphans */
1606 ubifs_assert(c->tot_orphans == 0);
1607 err = ubifs_clear_orphans(c);
1608 if (err)
1609 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001610 }
1611
1612 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1613 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1614 err = ubifs_write_master(c);
1615 if (err)
1616 goto out;
1617 }
1618
1619 c->ileb_buf = vmalloc(c->leb_size);
1620 if (!c->ileb_buf) {
1621 err = -ENOMEM;
1622 goto out;
1623 }
1624
Matthew L. Creechd8829622011-03-04 17:55:02 -05001625 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
1626 if (!c->write_reserve_buf)
1627 goto out;
1628
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001629 err = ubifs_lpt_init(c, 0, 1);
1630 if (err)
1631 goto out;
1632
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001633 /* Create background thread */
Hunter Adrianfcabb342009-03-18 12:29:39 +01001634 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001635 if (IS_ERR(c->bgt)) {
1636 err = PTR_ERR(c->bgt);
1637 c->bgt = NULL;
1638 ubifs_err("cannot spawn \"%s\", error %d",
1639 c->bgt_name, err);
Adrian Hunter2953e732008-09-04 16:26:00 +03001640 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001641 }
1642 wake_up_process(c->bgt);
1643
1644 c->orph_buf = vmalloc(c->leb_size);
Adrian Hunter2953e732008-09-04 16:26:00 +03001645 if (!c->orph_buf) {
1646 err = -ENOMEM;
1647 goto out;
1648 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001649
1650 /* Check for enough log space */
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
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001663 err = ubifs_leb_unmap(c, c->gc_lnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001664 if (err)
1665 goto out;
1666
Artem Bityutskiy8c230d92011-04-20 18:02:45 +03001667 dbg_gen("re-mounted read-write");
1668 c->remounting_rw = 0;
1669
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001670 if (c->need_recovery) {
1671 c->need_recovery = 0;
1672 ubifs_msg("deferred recovery completed");
Artem Bityutskiy8c230d92011-04-20 18:02:45 +03001673 } else {
1674 /*
1675 * Do not run the debugging space check if the were doing
1676 * recovery, because when we saved the information we had the
1677 * file-system in a state where the TNC and lprops has been
1678 * modified in memory, but all the I/O operations (including a
1679 * commit) were deferred. So the file-system was in
1680 * "non-committed" state. Now the file-system is in committed
1681 * state, and of course the amount of free space will change
1682 * because, for example, the old index size was imprecise.
1683 */
1684 err = dbg_check_space_info(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001685 }
Matthew L. Creech9d510db2011-05-06 18:58:23 -04001686
1687 if (c->space_fixup) {
1688 err = ubifs_fixup_free_space(c);
1689 if (err)
1690 goto out;
1691 }
1692
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001693 mutex_unlock(&c->umount_mutex);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001694 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001695
1696out:
Artem Bityutskiyc88ac002011-03-29 09:45:21 +03001697 c->ro_mount = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001698 vfree(c->orph_buf);
1699 c->orph_buf = NULL;
1700 if (c->bgt) {
1701 kthread_stop(c->bgt);
1702 c->bgt = NULL;
1703 }
1704 free_wbufs(c);
Matthew L. Creechd8829622011-03-04 17:55:02 -05001705 kfree(c->write_reserve_buf);
1706 c->write_reserve_buf = NULL;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001707 vfree(c->ileb_buf);
1708 c->ileb_buf = NULL;
1709 ubifs_lpt_free(c, 1);
1710 c->remounting_rw = 0;
1711 mutex_unlock(&c->umount_mutex);
1712 return err;
1713}
1714
1715/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001716 * ubifs_remount_ro - re-mount in read-only mode.
1717 * @c: UBIFS file-system description object
1718 *
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001719 * We assume VFS has stopped writing. Possibly the background thread could be
1720 * running a commit, however kthread_stop will wait in that case.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001721 */
1722static void ubifs_remount_ro(struct ubifs_info *c)
1723{
1724 int i, err;
1725
1726 ubifs_assert(!c->need_recovery);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001727 ubifs_assert(!c->ro_mount);
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001728
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001729 mutex_lock(&c->umount_mutex);
1730 if (c->bgt) {
1731 kthread_stop(c->bgt);
1732 c->bgt = NULL;
1733 }
1734
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001735 dbg_save_space_info(c);
1736
Artem Bityutskiy39037552010-10-18 08:28:50 +03001737 for (i = 0; i < c->jhead_cnt; i++)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001738 ubifs_wbuf_sync(&c->jheads[i].wbuf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001739
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001740 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1741 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1742 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1743 err = ubifs_write_master(c);
1744 if (err)
1745 ubifs_ro_mode(c, err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001746
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001747 vfree(c->orph_buf);
1748 c->orph_buf = NULL;
Matthew L. Creechd8829622011-03-04 17:55:02 -05001749 kfree(c->write_reserve_buf);
1750 c->write_reserve_buf = NULL;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001751 vfree(c->ileb_buf);
1752 c->ileb_buf = NULL;
1753 ubifs_lpt_free(c, 1);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001754 c->ro_mount = 1;
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001755 err = dbg_check_space_info(c);
1756 if (err)
1757 ubifs_ro_mode(c, err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001758 mutex_unlock(&c->umount_mutex);
1759}
1760
1761static void ubifs_put_super(struct super_block *sb)
1762{
1763 int i;
1764 struct ubifs_info *c = sb->s_fs_info;
1765
1766 ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num,
1767 c->vi.vol_id);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +02001768
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001769 /*
1770 * The following asserts are only valid if there has not been a failure
1771 * of the media. For example, there will be dirty inodes if we failed
1772 * to write them back because of I/O errors.
1773 */
Artem Bityutskiy1a067a22011-04-21 10:39:54 +03001774 if (!c->ro_error) {
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001775 ubifs_assert(c->bi.idx_growth == 0);
1776 ubifs_assert(c->bi.dd_growth == 0);
1777 ubifs_assert(c->bi.data_growth == 0);
Artem Bityutskiy1a067a22011-04-21 10:39:54 +03001778 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001779
1780 /*
1781 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1782 * and file system un-mount. Namely, it prevents the shrinker from
1783 * picking this superblock for shrinking - it will be just skipped if
1784 * the mutex is locked.
1785 */
1786 mutex_lock(&c->umount_mutex);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001787 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001788 /*
1789 * First of all kill the background thread to make sure it does
1790 * not interfere with un-mounting and freeing resources.
1791 */
1792 if (c->bgt) {
1793 kthread_stop(c->bgt);
1794 c->bgt = NULL;
1795 }
1796
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001797 /*
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001798 * On fatal errors c->ro_error is set to 1, in which case we do
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001799 * not write the master node.
1800 */
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001801 if (!c->ro_error) {
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001802 int err;
1803
1804 /* Synchronize write-buffers */
Artem Bityutskiy39037552010-10-18 08:28:50 +03001805 for (i = 0; i < c->jhead_cnt; i++)
1806 ubifs_wbuf_sync(&c->jheads[i].wbuf);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001807
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001808 /*
1809 * We are being cleanly unmounted which means the
1810 * orphans were killed - indicate this in the master
1811 * node. Also save the reserved GC LEB number.
1812 */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001813 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1814 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1815 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1816 err = ubifs_write_master(c);
1817 if (err)
1818 /*
1819 * Recovery will attempt to fix the master area
1820 * next mount, so we just print a message and
1821 * continue to unmount normally.
1822 */
Artem Bityutskiy79fda512012-08-27 13:34:09 +03001823 ubifs_err("failed to write master node, error %d",
1824 err);
Artem Bityutskiy3601ba22010-10-18 08:32:35 +03001825 } else {
1826 for (i = 0; i < c->jhead_cnt; i++)
1827 /* Make sure write-buffer timers are canceled */
1828 hrtimer_cancel(&c->jheads[i].wbuf.timer);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001829 }
1830 }
1831
1832 ubifs_umount(c);
1833 bdi_destroy(&c->bdi);
1834 ubi_close_volume(c->ubi);
1835 mutex_unlock(&c->umount_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001836}
1837
1838static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
1839{
1840 int err;
1841 struct ubifs_info *c = sb->s_fs_info;
1842
1843 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
1844
1845 err = ubifs_parse_options(c, data, 1);
1846 if (err) {
1847 ubifs_err("invalid or unknown remount parameter");
1848 return err;
1849 }
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001850
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001851 if (c->ro_mount && !(*flags & MS_RDONLY)) {
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001852 if (c->ro_error) {
1853 ubifs_msg("cannot re-mount R/W due to prior errors");
1854 return -EROFS;
1855 }
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001856 if (c->ro_media) {
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001857 ubifs_msg("cannot re-mount R/W - UBI volume is R/O");
Artem Bityutskiya2b9df32009-01-29 16:22:54 +02001858 return -EROFS;
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001859 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001860 err = ubifs_remount_rw(c);
Artem Bityutskiye9d6bbc2009-07-19 13:51:04 +03001861 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001862 return err;
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001863 } else if (!c->ro_mount && (*flags & MS_RDONLY)) {
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001864 if (c->ro_error) {
1865 ubifs_msg("cannot re-mount R/O due to prior errors");
Artem Bityutskiya2b9df32009-01-29 16:22:54 +02001866 return -EROFS;
Adrian Hunterb466f172009-01-29 12:59:33 +02001867 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001868 ubifs_remount_ro(c);
Adrian Hunterb466f172009-01-29 12:59:33 +02001869 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001870
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001871 if (c->bulk_read == 1)
1872 bu_init(c);
1873 else {
1874 dbg_gen("disable bulk-read");
1875 kfree(c->bu.buf);
1876 c->bu.buf = NULL;
1877 }
1878
Artem Bityutskiyb2213372009-03-15 17:20:22 +02001879 ubifs_assert(c->lst.taken_empty_lebs > 0);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001880 return 0;
1881}
1882
Artem Bityutskiye8b81562009-01-15 17:43:23 +02001883const struct super_operations ubifs_super_operations = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001884 .alloc_inode = ubifs_alloc_inode,
1885 .destroy_inode = ubifs_destroy_inode,
1886 .put_super = ubifs_put_super,
1887 .write_inode = ubifs_write_inode,
Al Virod640e1b2010-06-07 00:34:05 -04001888 .evict_inode = ubifs_evict_inode,
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001889 .statfs = ubifs_statfs,
1890 .dirty_inode = ubifs_dirty_inode,
1891 .remount_fs = ubifs_remount_fs,
1892 .show_options = ubifs_show_options,
1893 .sync_fs = ubifs_sync_fs,
1894};
1895
1896/**
1897 * open_ubi - parse UBI device name string and open the UBI device.
1898 * @name: UBI volume name
1899 * @mode: UBI volume open mode
1900 *
Corentin Chary97223242009-09-28 21:10:12 +02001901 * The primary method of mounting UBIFS is by specifying the UBI volume
1902 * character device node path. However, UBIFS may also be mounted withoug any
1903 * character device node using one of the following methods:
1904 *
1905 * o ubiX_Y - mount UBI device number X, volume Y;
1906 * o ubiY - mount UBI device number 0, volume Y;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001907 * o ubiX:NAME - mount UBI device X, volume with name NAME;
1908 * o ubi:NAME - mount UBI device 0, volume with name NAME.
1909 *
1910 * Alternative '!' separator may be used instead of ':' (because some shells
1911 * like busybox may interpret ':' as an NFS host name separator). This function
Corentin Chary97223242009-09-28 21:10:12 +02001912 * returns UBI volume description object in case of success and a negative
1913 * error code in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001914 */
1915static struct ubi_volume_desc *open_ubi(const char *name, int mode)
1916{
Corentin Chary97223242009-09-28 21:10:12 +02001917 struct ubi_volume_desc *ubi;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001918 int dev, vol;
1919 char *endptr;
1920
Corentin Chary97223242009-09-28 21:10:12 +02001921 /* First, try to open using the device node path method */
1922 ubi = ubi_open_volume_path(name, mode);
1923 if (!IS_ERR(ubi))
1924 return ubi;
1925
1926 /* Try the "nodev" method */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001927 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
1928 return ERR_PTR(-EINVAL);
1929
1930 /* ubi:NAME method */
1931 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
1932 return ubi_open_volume_nm(0, name + 4, mode);
1933
1934 if (!isdigit(name[3]))
1935 return ERR_PTR(-EINVAL);
1936
1937 dev = simple_strtoul(name + 3, &endptr, 0);
1938
1939 /* ubiY method */
1940 if (*endptr == '\0')
1941 return ubi_open_volume(0, dev, mode);
1942
1943 /* ubiX_Y method */
1944 if (*endptr == '_' && isdigit(endptr[1])) {
1945 vol = simple_strtoul(endptr + 1, &endptr, 0);
1946 if (*endptr != '\0')
1947 return ERR_PTR(-EINVAL);
1948 return ubi_open_volume(dev, vol, mode);
1949 }
1950
1951 /* ubiX:NAME method */
1952 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
1953 return ubi_open_volume_nm(dev, ++endptr, mode);
1954
1955 return ERR_PTR(-EINVAL);
1956}
1957
Al Virob1c27ab2011-06-12 10:07:03 -04001958static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi)
1959{
1960 struct ubifs_info *c;
1961
1962 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
1963 if (c) {
1964 spin_lock_init(&c->cnt_lock);
1965 spin_lock_init(&c->cs_lock);
1966 spin_lock_init(&c->buds_lock);
1967 spin_lock_init(&c->space_lock);
1968 spin_lock_init(&c->orphan_lock);
1969 init_rwsem(&c->commit_sem);
1970 mutex_init(&c->lp_mutex);
1971 mutex_init(&c->tnc_mutex);
1972 mutex_init(&c->log_mutex);
1973 mutex_init(&c->mst_mutex);
1974 mutex_init(&c->umount_mutex);
1975 mutex_init(&c->bu_mutex);
1976 mutex_init(&c->write_reserve_mutex);
1977 init_waitqueue_head(&c->cmt_wq);
1978 c->buds = RB_ROOT;
1979 c->old_idx = RB_ROOT;
1980 c->size_tree = RB_ROOT;
1981 c->orph_tree = RB_ROOT;
1982 INIT_LIST_HEAD(&c->infos_list);
1983 INIT_LIST_HEAD(&c->idx_gc);
1984 INIT_LIST_HEAD(&c->replay_list);
1985 INIT_LIST_HEAD(&c->replay_buds);
1986 INIT_LIST_HEAD(&c->uncat_list);
1987 INIT_LIST_HEAD(&c->empty_list);
1988 INIT_LIST_HEAD(&c->freeable_list);
1989 INIT_LIST_HEAD(&c->frdi_idx_list);
1990 INIT_LIST_HEAD(&c->unclean_leb_list);
1991 INIT_LIST_HEAD(&c->old_buds);
1992 INIT_LIST_HEAD(&c->orph_list);
1993 INIT_LIST_HEAD(&c->orph_new);
1994 c->no_chk_data_crc = 1;
1995
1996 c->highest_inum = UBIFS_FIRST_INO;
1997 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
1998
1999 ubi_get_volume_info(ubi, &c->vi);
2000 ubi_get_device_info(c->vi.ubi_num, &c->di);
2001 }
2002 return c;
2003}
2004
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002005static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
2006{
Al Virod251ed22011-06-12 10:24:33 -04002007 struct ubifs_info *c = sb->s_fs_info;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002008 struct inode *root;
2009 int err;
2010
Artem Bityutskiy8379ea32009-05-29 12:34:52 +03002011 c->vfs_sb = sb;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002012 /* Re-open the UBI device in read-write mode */
2013 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2014 if (IS_ERR(c->ubi)) {
2015 err = PTR_ERR(c->ubi);
Al Virod251ed22011-06-12 10:24:33 -04002016 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002017 }
2018
2019 /*
Artem Bityutskiy0a883a02008-08-13 14:13:26 +03002020 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002021 * UBIFS, I/O is not deferred, it is done immediately in readpage,
2022 * which means the user would have to wait not just for their own I/O
Artem Bityutskiy0a883a02008-08-13 14:13:26 +03002023 * but the read-ahead I/O as well i.e. completely pointless.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002024 *
2025 * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
2026 */
Jens Axboed9938312009-06-12 14:45:52 +02002027 c->bdi.name = "ubifs",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002028 c->bdi.capabilities = BDI_CAP_MAP_COPY;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002029 err = bdi_init(&c->bdi);
2030 if (err)
2031 goto out_close;
Daniel Mack7fcd9c32009-07-02 17:15:47 +02002032 err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
2033 c->vi.ubi_num, c->vi.vol_id);
Jens Axboea979eff2009-05-29 09:19:23 +02002034 if (err)
2035 goto out_bdi;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002036
2037 err = ubifs_parse_options(c, data, 0);
2038 if (err)
2039 goto out_bdi;
2040
Jens Axboe32a88aa2009-09-16 15:02:33 +02002041 sb->s_bdi = &c->bdi;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002042 sb->s_fs_info = c;
2043 sb->s_magic = UBIFS_SUPER_MAGIC;
2044 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2045 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002046 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2047 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2048 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2049 sb->s_op = &ubifs_super_operations;
2050
2051 mutex_lock(&c->umount_mutex);
2052 err = mount_ubifs(c);
2053 if (err) {
2054 ubifs_assert(err < 0);
2055 goto out_unlock;
2056 }
2057
2058 /* Read the root inode */
2059 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2060 if (IS_ERR(root)) {
2061 err = PTR_ERR(root);
2062 goto out_umount;
2063 }
2064
Al Viro48fde702012-01-08 22:15:13 -05002065 sb->s_root = d_make_root(root);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002066 if (!sb->s_root)
Al Viro48fde702012-01-08 22:15:13 -05002067 goto out_umount;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002068
2069 mutex_unlock(&c->umount_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002070 return 0;
2071
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002072out_umount:
2073 ubifs_umount(c);
2074out_unlock:
2075 mutex_unlock(&c->umount_mutex);
2076out_bdi:
2077 bdi_destroy(&c->bdi);
2078out_close:
2079 ubi_close_volume(c->ubi);
Al Virod251ed22011-06-12 10:24:33 -04002080out:
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002081 return err;
2082}
2083
2084static int sb_test(struct super_block *sb, void *data)
2085{
Al Virod251ed22011-06-12 10:24:33 -04002086 struct ubifs_info *c1 = data;
Artem Bityutskiy7c83f5c2009-05-25 19:23:04 +03002087 struct ubifs_info *c = sb->s_fs_info;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002088
Al Virod251ed22011-06-12 10:24:33 -04002089 return c->vi.cdev == c1->vi.cdev;
2090}
2091
2092static int sb_set(struct super_block *sb, void *data)
2093{
2094 sb->s_fs_info = data;
2095 return set_anon_super(sb, NULL);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002096}
2097
Al Viro157d81e2010-07-25 23:52:42 +04002098static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2099 const char *name, void *data)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002100{
2101 struct ubi_volume_desc *ubi;
Al Virod251ed22011-06-12 10:24:33 -04002102 struct ubifs_info *c;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002103 struct super_block *sb;
2104 int err;
2105
2106 dbg_gen("name %s, flags %#x", name, flags);
2107
2108 /*
2109 * Get UBI device number and volume ID. Mount it read-only so far
2110 * because this might be a new mount point, and UBI allows only one
2111 * read-write user at a time.
2112 */
2113 ubi = open_ubi(name, UBI_READONLY);
2114 if (IS_ERR(ubi)) {
Artem Bityutskiya6aae4d2012-05-16 20:11:23 +03002115 ubifs_err("cannot open \"%s\", error %d",
2116 name, (int)PTR_ERR(ubi));
Al Viro157d81e2010-07-25 23:52:42 +04002117 return ERR_CAST(ubi);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002118 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002119
Al Virod251ed22011-06-12 10:24:33 -04002120 c = alloc_ubifs_info(ubi);
2121 if (!c) {
2122 err = -ENOMEM;
2123 goto out_close;
2124 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002125
Al Virod251ed22011-06-12 10:24:33 -04002126 dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
2127
David Howells9249e172012-06-25 12:55:37 +01002128 sb = sget(fs_type, sb_test, sb_set, flags, c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002129 if (IS_ERR(sb)) {
2130 err = PTR_ERR(sb);
Al Virod251ed22011-06-12 10:24:33 -04002131 kfree(c);
Dan Carpenter185bf872011-06-20 10:10:24 +03002132 goto out_close;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002133 }
2134
2135 if (sb->s_root) {
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03002136 struct ubifs_info *c1 = sb->s_fs_info;
Al Virod251ed22011-06-12 10:24:33 -04002137 kfree(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002138 /* A new mount point for already mounted UBIFS */
2139 dbg_gen("this ubi volume is already mounted");
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03002140 if (!!(flags & MS_RDONLY) != c1->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002141 err = -EBUSY;
2142 goto out_deact;
2143 }
2144 } else {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002145 err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
2146 if (err)
2147 goto out_deact;
2148 /* We do not support atime */
2149 sb->s_flags |= MS_ACTIVE | MS_NOATIME;
2150 }
2151
2152 /* 'fill_super()' opens ubi again so we must close it here */
2153 ubi_close_volume(ubi);
2154
Al Viro157d81e2010-07-25 23:52:42 +04002155 return dget(sb->s_root);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002156
2157out_deact:
Al Viro6f5bbff2009-05-06 01:34:22 -04002158 deactivate_locked_super(sb);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002159out_close:
2160 ubi_close_volume(ubi);
Al Viro157d81e2010-07-25 23:52:42 +04002161 return ERR_PTR(err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002162}
2163
Al Virod251ed22011-06-12 10:24:33 -04002164static 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
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002171static struct file_system_type ubifs_fs_type = {
2172 .name = "ubifs",
2173 .owner = THIS_MODULE,
Al Viro157d81e2010-07-25 23:52:42 +04002174 .mount = ubifs_mount,
Al Virod251ed22011-06-12 10:24:33 -04002175 .kill_sb = kill_ubifs_super,
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002176};
2177
2178/*
2179 * Inode slab cache constructor.
2180 */
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07002181static void inode_slab_ctor(void *obj)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002182{
2183 struct ubifs_inode *ui = obj;
2184 inode_init_once(&ui->vfs_inode);
2185}
2186
2187static int __init ubifs_init(void)
2188{
2189 int err;
2190
2191 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2192
2193 /* Make sure node sizes are 8-byte aligned */
2194 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2195 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2196 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2197 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2198 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2199 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2200 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2201 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2202 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2203 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2204 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2205
2206 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2207 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2208 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2209 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2210 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2211 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2212
2213 /* Check min. node size */
2214 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2215 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2216 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2217 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2218
2219 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2220 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2221 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2222 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2223
2224 /* Defined node sizes */
2225 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2226 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2227 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2228 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2229
2230 /*
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02002231 * We use 2 bit wide bit-fields to store compression type, which should
2232 * be amended if more compressors are added. The bit-fields are:
Artem Bityutskiy553dea42008-11-01 14:57:49 +02002233 * @compr_type in 'struct ubifs_inode', @default_compr in
2234 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02002235 */
2236 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2237
2238 /*
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002239 * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
2240 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2241 */
2242 if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
Artem Bityutskiy79fda512012-08-27 13:34:09 +03002243 ubifs_err("VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002244 (unsigned int)PAGE_CACHE_SIZE);
2245 return -EINVAL;
2246 }
2247
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002248 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2249 sizeof(struct ubifs_inode), 0,
2250 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
2251 &inode_slab_ctor);
2252 if (!ubifs_inode_slab)
Al Viro5cc361e2011-12-12 23:58:21 -05002253 return -ENOMEM;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002254
2255 register_shrinker(&ubifs_shrinker_info);
2256
2257 err = ubifs_compressors_init();
2258 if (err)
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002259 goto out_shrinker;
2260
2261 err = dbg_debugfs_init();
2262 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002263 goto out_compr;
2264
Al Viro5cc361e2011-12-12 23:58:21 -05002265 err = register_filesystem(&ubifs_fs_type);
2266 if (err) {
2267 ubifs_err("cannot register file system, error %d", err);
2268 goto out_dbg;
2269 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002270 return 0;
2271
Al Viro5cc361e2011-12-12 23:58:21 -05002272out_dbg:
2273 dbg_debugfs_exit();
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002274out_compr:
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002275 ubifs_compressors_exit();
2276out_shrinker:
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002277 unregister_shrinker(&ubifs_shrinker_info);
2278 kmem_cache_destroy(ubifs_inode_slab);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002279 return err;
2280}
2281/* late_initcall to let compressors initialize first */
2282late_initcall(ubifs_init);
2283
2284static void __exit ubifs_exit(void)
2285{
2286 ubifs_assert(list_empty(&ubifs_infos));
2287 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
2288
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002289 dbg_debugfs_exit();
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002290 ubifs_compressors_exit();
2291 unregister_shrinker(&ubifs_shrinker_info);
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10002292
2293 /*
2294 * Make sure all delayed rcu free inodes are flushed before we
2295 * destroy cache.
2296 */
2297 rcu_barrier();
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002298 kmem_cache_destroy(ubifs_inode_slab);
2299 unregister_filesystem(&ubifs_fs_type);
2300}
2301module_exit(ubifs_exit);
2302
2303MODULE_LICENSE("GPL");
2304MODULE_VERSION(__stringify(UBIFS_VERSION));
2305MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2306MODULE_DESCRIPTION("UBIFS - UBI File System");