blob: 04ad07f4fcc3da11b05e868442ed6f3bc7ad7729 [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
88 if (ui->xattr && (inode->i_mode & S_IFMT) != S_IFREG)
89 return 5;
90
91 if (!ubifs_compr_present(ui->compr_type)) {
92 ubifs_warn("inode %lu uses '%s' compression, but it was not "
93 "compiled in", inode->i_ino,
94 ubifs_compr_name(ui->compr_type));
95 }
96
97 err = dbg_check_dir_size(c, inode);
98 return err;
99}
100
101struct inode *ubifs_iget(struct super_block *sb, unsigned long inum)
102{
103 int err;
104 union ubifs_key key;
105 struct ubifs_ino_node *ino;
106 struct ubifs_info *c = sb->s_fs_info;
107 struct inode *inode;
108 struct ubifs_inode *ui;
109
110 dbg_gen("inode %lu", inum);
111
112 inode = iget_locked(sb, inum);
113 if (!inode)
114 return ERR_PTR(-ENOMEM);
115 if (!(inode->i_state & I_NEW))
116 return inode;
117 ui = ubifs_inode(inode);
118
119 ino = kmalloc(UBIFS_MAX_INO_NODE_SZ, GFP_NOFS);
120 if (!ino) {
121 err = -ENOMEM;
122 goto out;
123 }
124
125 ino_key_init(c, &key, inode->i_ino);
126
127 err = ubifs_tnc_lookup(c, &key, ino);
128 if (err)
129 goto out_ino;
130
131 inode->i_flags |= (S_NOCMTIME | S_NOATIME);
132 inode->i_nlink = le32_to_cpu(ino->nlink);
133 inode->i_uid = le32_to_cpu(ino->uid);
134 inode->i_gid = le32_to_cpu(ino->gid);
135 inode->i_atime.tv_sec = (int64_t)le64_to_cpu(ino->atime_sec);
136 inode->i_atime.tv_nsec = le32_to_cpu(ino->atime_nsec);
137 inode->i_mtime.tv_sec = (int64_t)le64_to_cpu(ino->mtime_sec);
138 inode->i_mtime.tv_nsec = le32_to_cpu(ino->mtime_nsec);
139 inode->i_ctime.tv_sec = (int64_t)le64_to_cpu(ino->ctime_sec);
140 inode->i_ctime.tv_nsec = le32_to_cpu(ino->ctime_nsec);
141 inode->i_mode = le32_to_cpu(ino->mode);
142 inode->i_size = le64_to_cpu(ino->size);
143
144 ui->data_len = le32_to_cpu(ino->data_len);
145 ui->flags = le32_to_cpu(ino->flags);
146 ui->compr_type = le16_to_cpu(ino->compr_type);
147 ui->creat_sqnum = le64_to_cpu(ino->creat_sqnum);
148 ui->xattr_cnt = le32_to_cpu(ino->xattr_cnt);
149 ui->xattr_size = le32_to_cpu(ino->xattr_size);
150 ui->xattr_names = le32_to_cpu(ino->xattr_names);
151 ui->synced_i_size = ui->ui_size = inode->i_size;
152
153 ui->xattr = (ui->flags & UBIFS_XATTR_FL) ? 1 : 0;
154
155 err = validate_inode(c, inode);
156 if (err)
157 goto out_invalid;
158
Artem Bityutskiy0a883a02008-08-13 14:13:26 +0300159 /* Disable read-ahead */
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300160 inode->i_mapping->backing_dev_info = &c->bdi;
161
162 switch (inode->i_mode & S_IFMT) {
163 case S_IFREG:
164 inode->i_mapping->a_ops = &ubifs_file_address_operations;
165 inode->i_op = &ubifs_file_inode_operations;
166 inode->i_fop = &ubifs_file_operations;
167 if (ui->xattr) {
168 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
169 if (!ui->data) {
170 err = -ENOMEM;
171 goto out_ino;
172 }
173 memcpy(ui->data, ino->data, ui->data_len);
174 ((char *)ui->data)[ui->data_len] = '\0';
175 } else if (ui->data_len != 0) {
176 err = 10;
177 goto out_invalid;
178 }
179 break;
180 case S_IFDIR:
181 inode->i_op = &ubifs_dir_inode_operations;
182 inode->i_fop = &ubifs_dir_operations;
183 if (ui->data_len != 0) {
184 err = 11;
185 goto out_invalid;
186 }
187 break;
188 case S_IFLNK:
189 inode->i_op = &ubifs_symlink_inode_operations;
190 if (ui->data_len <= 0 || ui->data_len > UBIFS_MAX_INO_DATA) {
191 err = 12;
192 goto out_invalid;
193 }
194 ui->data = kmalloc(ui->data_len + 1, GFP_NOFS);
195 if (!ui->data) {
196 err = -ENOMEM;
197 goto out_ino;
198 }
199 memcpy(ui->data, ino->data, ui->data_len);
200 ((char *)ui->data)[ui->data_len] = '\0';
201 break;
202 case S_IFBLK:
203 case S_IFCHR:
204 {
205 dev_t rdev;
206 union ubifs_dev_desc *dev;
207
208 ui->data = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
209 if (!ui->data) {
210 err = -ENOMEM;
211 goto out_ino;
212 }
213
214 dev = (union ubifs_dev_desc *)ino->data;
215 if (ui->data_len == sizeof(dev->new))
216 rdev = new_decode_dev(le32_to_cpu(dev->new));
217 else if (ui->data_len == sizeof(dev->huge))
218 rdev = huge_decode_dev(le64_to_cpu(dev->huge));
219 else {
220 err = 13;
221 goto out_invalid;
222 }
223 memcpy(ui->data, ino->data, ui->data_len);
224 inode->i_op = &ubifs_file_inode_operations;
225 init_special_inode(inode, inode->i_mode, rdev);
226 break;
227 }
228 case S_IFSOCK:
229 case S_IFIFO:
230 inode->i_op = &ubifs_file_inode_operations;
231 init_special_inode(inode, inode->i_mode, 0);
232 if (ui->data_len != 0) {
233 err = 14;
234 goto out_invalid;
235 }
236 break;
237 default:
238 err = 15;
239 goto out_invalid;
240 }
241
242 kfree(ino);
243 ubifs_set_inode_flags(inode);
244 unlock_new_inode(inode);
245 return inode;
246
247out_invalid:
248 ubifs_err("inode %lu validation failed, error %d", inode->i_ino, err);
249 dbg_dump_node(c, ino);
250 dbg_dump_inode(c, inode);
251 err = -EINVAL;
252out_ino:
253 kfree(ino);
254out:
255 ubifs_err("failed to read inode %lu, error %d", inode->i_ino, err);
256 iget_failed(inode);
257 return ERR_PTR(err);
258}
259
260static struct inode *ubifs_alloc_inode(struct super_block *sb)
261{
262 struct ubifs_inode *ui;
263
264 ui = kmem_cache_alloc(ubifs_inode_slab, GFP_NOFS);
265 if (!ui)
266 return NULL;
267
268 memset((void *)ui + sizeof(struct inode), 0,
269 sizeof(struct ubifs_inode) - sizeof(struct inode));
270 mutex_init(&ui->ui_mutex);
271 spin_lock_init(&ui->ui_lock);
272 return &ui->vfs_inode;
273};
274
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100275static void ubifs_i_callback(struct rcu_head *head)
276{
277 struct inode *inode = container_of(head, struct inode, i_rcu);
278 struct ubifs_inode *ui = ubifs_inode(inode);
279 INIT_LIST_HEAD(&inode->i_dentry);
280 kmem_cache_free(ubifs_inode_slab, ui);
281}
282
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300283static void ubifs_destroy_inode(struct inode *inode)
284{
285 struct ubifs_inode *ui = ubifs_inode(inode);
286
287 kfree(ui->data);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100288 call_rcu(&inode->i_rcu, ubifs_i_callback);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300289}
290
291/*
292 * Note, Linux write-back code calls this without 'i_mutex'.
293 */
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100294static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300295{
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300296 int err = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300297 struct ubifs_info *c = inode->i_sb->s_fs_info;
298 struct ubifs_inode *ui = ubifs_inode(inode);
299
300 ubifs_assert(!ui->xattr);
301 if (is_bad_inode(inode))
302 return 0;
303
304 mutex_lock(&ui->ui_mutex);
305 /*
306 * Due to races between write-back forced by budgeting
307 * (see 'sync_some_inodes()') and pdflush write-back, the inode may
308 * have already been synchronized, do not do this again. This might
309 * also happen if it was synchronized in an VFS operation, e.g.
310 * 'ubifs_link()'.
311 */
312 if (!ui->dirty) {
313 mutex_unlock(&ui->ui_mutex);
314 return 0;
315 }
316
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300317 /*
318 * As an optimization, do not write orphan inodes to the media just
319 * because this is not needed.
320 */
321 dbg_gen("inode %lu, mode %#x, nlink %u",
322 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
323 if (inode->i_nlink) {
Artem Bityutskiy1f286812008-07-22 12:06:13 +0300324 err = ubifs_jnl_write_inode(c, inode);
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300325 if (err)
326 ubifs_err("can't write inode %lu, error %d",
327 inode->i_ino, err);
Artem Bityutskiye3c3efc2009-08-27 16:34:19 +0300328 else
329 err = dbg_check_inode_size(c, inode, ui->ui_size);
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300330 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300331
332 ui->dirty = 0;
333 mutex_unlock(&ui->ui_mutex);
334 ubifs_release_dirty_inode_budget(c, ui);
335 return err;
336}
337
Al Virod640e1b2010-06-07 00:34:05 -0400338static void ubifs_evict_inode(struct inode *inode)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300339{
340 int err;
341 struct ubifs_info *c = inode->i_sb->s_fs_info;
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300342 struct ubifs_inode *ui = ubifs_inode(inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300343
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300344 if (ui->xattr)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300345 /*
346 * Extended attribute inode deletions are fully handled in
347 * 'ubifs_removexattr()'. These inodes are special and have
348 * limited usage, so there is nothing to do here.
349 */
350 goto out;
351
Artem Bityutskiy7d32c2b2008-07-18 18:54:29 +0300352 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300353 ubifs_assert(!atomic_read(&inode->i_count));
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300354
355 truncate_inode_pages(&inode->i_data, 0);
Al Virod640e1b2010-06-07 00:34:05 -0400356
357 if (inode->i_nlink)
358 goto done;
359
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300360 if (is_bad_inode(inode))
361 goto out;
362
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300363 ui->ui_size = inode->i_size = 0;
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300364 err = ubifs_jnl_delete_inode(c, inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300365 if (err)
366 /*
367 * Worst case we have a lost orphan inode wasting space, so a
Artem Bityutskiy0a883a02008-08-13 14:13:26 +0300368 * simple error message is OK here.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300369 */
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300370 ubifs_err("can't delete inode %lu, error %d",
371 inode->i_ino, err);
372
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300373out:
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300374 if (ui->dirty)
375 ubifs_release_dirty_inode_budget(c, ui);
Adrian Hunter6d6cb0d2009-04-08 14:07:57 +0200376 else {
377 /* We've deleted something - clean the "no space" flags */
378 c->nospace = c->nospace_rp = 0;
379 smp_wmb();
380 }
Al Virod640e1b2010-06-07 00:34:05 -0400381done:
382 end_writeback(inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300383}
384
385static void ubifs_dirty_inode(struct inode *inode)
386{
387 struct ubifs_inode *ui = ubifs_inode(inode);
388
389 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
390 if (!ui->dirty) {
391 ui->dirty = 1;
392 dbg_gen("inode %lu", inode->i_ino);
393 }
394}
395
396static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
397{
398 struct ubifs_info *c = dentry->d_sb->s_fs_info;
399 unsigned long long free;
Artem Bityutskiy7c7cbad2008-09-03 14:16:42 +0300400 __le32 *uuid = (__le32 *)c->uuid;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300401
Artem Bityutskiy7dad1812008-08-25 18:58:19 +0300402 free = ubifs_get_free_space(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300403 dbg_gen("free space %lld bytes (%lld blocks)",
404 free, free >> UBIFS_BLOCK_SHIFT);
405
406 buf->f_type = UBIFS_SUPER_MAGIC;
407 buf->f_bsize = UBIFS_BLOCK_SIZE;
408 buf->f_blocks = c->block_cnt;
409 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
410 if (free > c->report_rp_size)
411 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
412 else
413 buf->f_bavail = 0;
414 buf->f_files = 0;
415 buf->f_ffree = 0;
416 buf->f_namelen = UBIFS_MAX_NLEN;
Artem Bityutskiy7c7cbad2008-09-03 14:16:42 +0300417 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
418 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
Artem Bityutskiyb4978e92009-01-23 18:23:03 +0200419 ubifs_assert(buf->f_bfree <= c->block_cnt);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300420 return 0;
421}
422
423static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt)
424{
425 struct ubifs_info *c = mnt->mnt_sb->s_fs_info;
426
427 if (c->mount_opts.unmount_mode == 2)
428 seq_printf(s, ",fast_unmount");
429 else if (c->mount_opts.unmount_mode == 1)
430 seq_printf(s, ",norm_unmount");
431
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300432 if (c->mount_opts.bulk_read == 2)
433 seq_printf(s, ",bulk_read");
434 else if (c->mount_opts.bulk_read == 1)
435 seq_printf(s, ",no_bulk_read");
436
Adrian Hunter2953e732008-09-04 16:26:00 +0300437 if (c->mount_opts.chk_data_crc == 2)
438 seq_printf(s, ",chk_data_crc");
439 else if (c->mount_opts.chk_data_crc == 1)
440 seq_printf(s, ",no_chk_data_crc");
441
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200442 if (c->mount_opts.override_compr) {
Hunter Adrianfcabb342009-03-18 12:29:39 +0100443 seq_printf(s, ",compr=%s",
444 ubifs_compr_name(c->mount_opts.compr_type));
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200445 }
446
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300447 return 0;
448}
449
450static int ubifs_sync_fs(struct super_block *sb, int wait)
451{
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200452 int i, err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300453 struct ubifs_info *c = sb->s_fs_info;
Artem Bityutskiy304d4272008-12-28 08:04:17 +0200454
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800455 /*
Artem Bityutskiydedb0d42009-01-09 21:02:37 +0200456 * Zero @wait is just an advisory thing to help the file system shove
457 * lots of data into the queues, and there will be the second
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800458 * '->sync_fs()' call, with non-zero @wait.
459 */
Artem Bityutskiydedb0d42009-01-09 21:02:37 +0200460 if (!wait)
461 return 0;
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800462
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200463 /*
Adrian Hunter3eb14292009-01-29 11:17:24 +0200464 * Synchronize write buffers, because 'ubifs_run_commit()' does not
465 * do this if it waits for an already running commit.
466 */
467 for (i = 0; i < c->jhead_cnt; i++) {
468 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
469 if (err)
470 return err;
471 }
472
Artem Bityutskiy887ee172009-07-20 17:56:19 +0300473 /*
474 * Strictly speaking, it is not necessary to commit the journal here,
475 * synchronizing write-buffers would be enough. But committing makes
476 * UBIFS free space predictions much more accurate, so we want to let
477 * the user be able to get more accurate results of 'statfs()' after
478 * they synchronize the file system.
479 */
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200480 err = ubifs_run_commit(c);
481 if (err)
482 return err;
Artem Bityutskiy403e12a2008-09-09 12:31:37 +0300483
Artem Bityutskiycb5c6a22008-12-28 08:18:43 +0200484 return ubi_sync(c->vi.ubi_num);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300485}
486
487/**
488 * init_constants_early - initialize UBIFS constants.
489 * @c: UBIFS file-system description object
490 *
491 * This function initialize UBIFS constants which do not need the superblock to
492 * be read. It also checks that the UBI volume satisfies basic UBIFS
493 * requirements. Returns zero in case of success and a negative error code in
494 * case of failure.
495 */
496static int init_constants_early(struct ubifs_info *c)
497{
498 if (c->vi.corrupted) {
499 ubifs_warn("UBI volume is corrupted - read-only mode");
500 c->ro_media = 1;
501 }
502
503 if (c->di.ro_mode) {
504 ubifs_msg("read-only UBI device");
505 c->ro_media = 1;
506 }
507
508 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
509 ubifs_msg("static UBI volume - read-only mode");
510 c->ro_media = 1;
511 }
512
513 c->leb_cnt = c->vi.size;
514 c->leb_size = c->vi.usable_leb_size;
Artem Bityutskiyca2ec612011-02-14 15:17:55 +0200515 c->leb_start = c->di.leb_start;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300516 c->half_leb_size = c->leb_size / 2;
517 c->min_io_size = c->di.min_io_size;
518 c->min_io_shift = fls(c->min_io_size) - 1;
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +0200519 c->max_write_size = c->di.max_write_size;
520 c->max_write_shift = fls(c->max_write_size) - 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300521
522 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
523 ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
524 c->leb_size, UBIFS_MIN_LEB_SZ);
525 return -EINVAL;
526 }
527
528 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
529 ubifs_err("too few LEBs (%d), min. is %d",
530 c->leb_cnt, UBIFS_MIN_LEB_CNT);
531 return -EINVAL;
532 }
533
534 if (!is_power_of_2(c->min_io_size)) {
535 ubifs_err("bad min. I/O size %d", c->min_io_size);
536 return -EINVAL;
537 }
538
539 /*
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +0200540 * Maximum write size has to be greater or equivalent to min. I/O
541 * size, and be multiple of min. I/O size.
542 */
543 if (c->max_write_size < c->min_io_size ||
544 c->max_write_size % c->min_io_size ||
545 !is_power_of_2(c->max_write_size)) {
546 ubifs_err("bad write buffer size %d for %d min. I/O unit",
547 c->max_write_size, c->min_io_size);
548 return -EINVAL;
549 }
550
551 /*
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300552 * UBIFS aligns all node to 8-byte boundary, so to make function in
553 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
554 * less than 8.
555 */
556 if (c->min_io_size < 8) {
557 c->min_io_size = 8;
558 c->min_io_shift = 3;
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +0200559 if (c->max_write_size < c->min_io_size) {
560 c->max_write_size = c->min_io_size;
561 c->max_write_shift = c->min_io_shift;
562 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300563 }
564
565 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
566 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
567
568 /*
569 * Initialize node length ranges which are mostly needed for node
570 * length validation.
571 */
572 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
573 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
574 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
575 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
576 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
577 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
578
579 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
580 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
581 c->ranges[UBIFS_ORPH_NODE].min_len =
582 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
583 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
584 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
585 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
586 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
587 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
588 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
589 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
590 /*
591 * Minimum indexing node size is amended later when superblock is
592 * read and the key length is known.
593 */
594 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
595 /*
596 * Maximum indexing node size is amended later when superblock is
597 * read and the fanout is known.
598 */
599 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
600
601 /*
Artem Bityutskiy70782022009-01-19 19:57:27 +0200602 * Initialize dead and dark LEB space watermarks. See gc.c for comments
603 * about these values.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300604 */
605 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
606 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
607
Artem Bityutskiy9bbb5722008-08-22 18:23:22 +0300608 /*
609 * Calculate how many bytes would be wasted at the end of LEB if it was
610 * fully filled with data nodes of maximum size. This is used in
611 * calculations when reporting free space.
612 */
613 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
Artem Bityutskiy39ce81c2008-11-18 18:09:49 +0200614
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300615 /* Buffer size for bulk-reads */
Artem Bityutskiy6c0c42c2008-11-18 20:20:05 +0200616 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
617 if (c->max_bu_buf_len > c->leb_size)
618 c->max_bu_buf_len = c->leb_size;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300619 return 0;
620}
621
622/**
623 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
624 * @c: UBIFS file-system description object
625 * @lnum: LEB the write-buffer was synchronized to
626 * @free: how many free bytes left in this LEB
627 * @pad: how many bytes were padded
628 *
629 * This is a callback function which is called by the I/O unit when the
630 * write-buffer is synchronized. We need this to correctly maintain space
631 * accounting in bud logical eraseblocks. This function returns zero in case of
632 * success and a negative error code in case of failure.
633 *
634 * This function actually belongs to the journal, but we keep it here because
635 * we want to keep it static.
636 */
637static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
638{
639 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
640}
641
642/*
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200643 * init_constants_sb - initialize UBIFS constants.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300644 * @c: UBIFS file-system description object
645 *
646 * This is a helper function which initializes various UBIFS constants after
647 * the superblock has been read. It also checks various UBIFS parameters and
648 * makes sure they are all right. Returns zero in case of success and a
649 * negative error code in case of failure.
650 */
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200651static int init_constants_sb(struct ubifs_info *c)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300652{
653 int tmp, err;
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200654 long long tmp64;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300655
656 c->main_bytes = (long long)c->main_lebs * c->leb_size;
657 c->max_znode_sz = sizeof(struct ubifs_znode) +
658 c->fanout * sizeof(struct ubifs_zbranch);
659
660 tmp = ubifs_idx_node_sz(c, 1);
661 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
662 c->min_idx_node_sz = ALIGN(tmp, 8);
663
664 tmp = ubifs_idx_node_sz(c, c->fanout);
665 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
666 c->max_idx_node_sz = ALIGN(tmp, 8);
667
668 /* Make sure LEB size is large enough to fit full commit */
669 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
670 tmp = ALIGN(tmp, c->min_io_size);
671 if (tmp > c->leb_size) {
672 dbg_err("too small LEB size %d, at least %d needed",
673 c->leb_size, tmp);
674 return -EINVAL;
675 }
676
677 /*
678 * Make sure that the log is large enough to fit reference nodes for
679 * all buds plus one reserved LEB.
680 */
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200681 tmp64 = c->max_bud_bytes + c->leb_size - 1;
682 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300683 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
684 tmp /= c->leb_size;
685 tmp += 1;
686 if (c->log_lebs < tmp) {
687 dbg_err("too small log %d LEBs, required min. %d LEBs",
688 c->log_lebs, tmp);
689 return -EINVAL;
690 }
691
692 /*
693 * When budgeting we assume worst-case scenarios when the pages are not
694 * be compressed and direntries are of the maximum size.
695 *
696 * Note, data, which may be stored in inodes is budgeted separately, so
697 * it is not included into 'c->inode_budget'.
698 */
699 c->page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
700 c->inode_budget = UBIFS_INO_NODE_SZ;
701 c->dent_budget = UBIFS_MAX_DENT_NODE_SZ;
702
703 /*
704 * When the amount of flash space used by buds becomes
705 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
706 * The writers are unblocked when the commit is finished. To avoid
707 * writers to be blocked UBIFS initiates background commit in advance,
708 * when number of bud bytes becomes above the limit defined below.
709 */
710 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
711
712 /*
713 * Ensure minimum journal size. All the bytes in the journal heads are
714 * considered to be used, when calculating the current journal usage.
715 * Consequently, if the journal is too small, UBIFS will treat it as
716 * always full.
717 */
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200718 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300719 if (c->bg_bud_bytes < tmp64)
720 c->bg_bud_bytes = tmp64;
721 if (c->max_bud_bytes < tmp64 + c->leb_size)
722 c->max_bud_bytes = tmp64 + c->leb_size;
723
724 err = ubifs_calc_lpt_geom(c);
725 if (err)
726 return err;
727
Artem Bityutskiyfb1cd012009-03-16 09:56:57 +0200728 /* Initialize effective LEB size used in budgeting calculations */
729 c->idx_leb_size = c->leb_size - c->max_idx_node_sz;
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200730 return 0;
731}
732
733/*
734 * init_constants_master - initialize UBIFS constants.
735 * @c: UBIFS file-system description object
736 *
737 * This is a helper function which initializes various UBIFS constants after
738 * the master node has been read. It also checks various UBIFS parameters and
739 * makes sure they are all right.
740 */
741static void init_constants_master(struct ubifs_info *c)
742{
743 long long tmp64;
744
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300745 c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
Artem Bityutskiyfb1cd012009-03-16 09:56:57 +0200746 c->report_rp_size = ubifs_reported_space(c, c->rp_size);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300747
748 /*
749 * Calculate total amount of FS blocks. This number is not used
750 * internally because it does not make much sense for UBIFS, but it is
751 * necessary to report something for the 'statfs()' call.
752 *
Artem Bityutskiy7dad1812008-08-25 18:58:19 +0300753 * Subtract the LEB reserved for GC, the LEB which is reserved for
Artem Bityutskiyaf14a1a2008-12-19 19:26:29 +0200754 * deletions, minimum LEBs for the index, and assume only one journal
755 * head is available.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300756 */
Artem Bityutskiyaf14a1a2008-12-19 19:26:29 +0200757 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200758 tmp64 *= (long long)c->leb_size - c->leb_overhead;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300759 tmp64 = ubifs_reported_space(c, tmp64);
760 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300761}
762
763/**
764 * take_gc_lnum - reserve GC LEB.
765 * @c: UBIFS file-system description object
766 *
Artem Bityutskiyb4978e92009-01-23 18:23:03 +0200767 * This function ensures that the LEB reserved for garbage collection is marked
768 * as "taken" in lprops. We also have to set free space to LEB size and dirty
769 * space to zero, because lprops may contain out-of-date information if the
770 * file-system was un-mounted before it has been committed. This function
771 * returns zero in case of success and a negative error code in case of
772 * failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300773 */
774static int take_gc_lnum(struct ubifs_info *c)
775{
776 int err;
777
778 if (c->gc_lnum == -1) {
779 ubifs_err("no LEB for GC");
780 return -EINVAL;
781 }
782
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300783 /* And we have to tell lprops that this LEB is taken */
784 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
785 LPROPS_TAKEN, 0, 0);
786 return err;
787}
788
789/**
790 * alloc_wbufs - allocate write-buffers.
791 * @c: UBIFS file-system description object
792 *
793 * This helper function allocates and initializes UBIFS write-buffers. Returns
794 * zero in case of success and %-ENOMEM in case of failure.
795 */
796static int alloc_wbufs(struct ubifs_info *c)
797{
798 int i, err;
799
800 c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead),
801 GFP_KERNEL);
802 if (!c->jheads)
803 return -ENOMEM;
804
805 /* Initialize journal heads */
806 for (i = 0; i < c->jhead_cnt; i++) {
807 INIT_LIST_HEAD(&c->jheads[i].buds_list);
808 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
809 if (err)
810 return err;
811
812 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
813 c->jheads[i].wbuf.jhead = i;
814 }
815
816 c->jheads[BASEHD].wbuf.dtype = UBI_SHORTTERM;
817 /*
818 * Garbage Collector head likely contains long-term data and
819 * does not need to be synchronized by timer.
820 */
821 c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM;
Artem Bityutskiy0b335b92009-06-23 12:30:43 +0300822 c->jheads[GCHD].wbuf.no_timer = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300823
824 return 0;
825}
826
827/**
828 * free_wbufs - free write-buffers.
829 * @c: UBIFS file-system description object
830 */
831static void free_wbufs(struct ubifs_info *c)
832{
833 int i;
834
835 if (c->jheads) {
836 for (i = 0; i < c->jhead_cnt; i++) {
837 kfree(c->jheads[i].wbuf.buf);
838 kfree(c->jheads[i].wbuf.inodes);
839 }
840 kfree(c->jheads);
841 c->jheads = NULL;
842 }
843}
844
845/**
846 * free_orphans - free orphans.
847 * @c: UBIFS file-system description object
848 */
849static void free_orphans(struct ubifs_info *c)
850{
851 struct ubifs_orphan *orph;
852
853 while (c->orph_dnext) {
854 orph = c->orph_dnext;
855 c->orph_dnext = orph->dnext;
856 list_del(&orph->list);
857 kfree(orph);
858 }
859
860 while (!list_empty(&c->orph_list)) {
861 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
862 list_del(&orph->list);
863 kfree(orph);
864 dbg_err("orphan list not empty at unmount");
865 }
866
867 vfree(c->orph_buf);
868 c->orph_buf = NULL;
869}
870
871/**
872 * free_buds - free per-bud objects.
873 * @c: UBIFS file-system description object
874 */
875static void free_buds(struct ubifs_info *c)
876{
877 struct rb_node *this = c->buds.rb_node;
878 struct ubifs_bud *bud;
879
880 while (this) {
881 if (this->rb_left)
882 this = this->rb_left;
883 else if (this->rb_right)
884 this = this->rb_right;
885 else {
886 bud = rb_entry(this, struct ubifs_bud, rb);
887 this = rb_parent(this);
888 if (this) {
889 if (this->rb_left == &bud->rb)
890 this->rb_left = NULL;
891 else
892 this->rb_right = NULL;
893 }
894 kfree(bud);
895 }
896 }
897}
898
899/**
900 * check_volume_empty - check if the UBI volume is empty.
901 * @c: UBIFS file-system description object
902 *
903 * This function checks if the UBIFS volume is empty by looking if its LEBs are
904 * mapped or not. The result of checking is stored in the @c->empty variable.
905 * Returns zero in case of success and a negative error code in case of
906 * failure.
907 */
908static int check_volume_empty(struct ubifs_info *c)
909{
910 int lnum, err;
911
912 c->empty = 1;
913 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
914 err = ubi_is_mapped(c->ubi, lnum);
915 if (unlikely(err < 0))
916 return err;
917 if (err == 1) {
918 c->empty = 0;
919 break;
920 }
921
922 cond_resched();
923 }
924
925 return 0;
926}
927
928/*
929 * UBIFS mount options.
930 *
931 * Opt_fast_unmount: do not run a journal commit before un-mounting
932 * Opt_norm_unmount: run a journal commit before un-mounting
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300933 * Opt_bulk_read: enable bulk-reads
934 * Opt_no_bulk_read: disable bulk-reads
Adrian Hunter2953e732008-09-04 16:26:00 +0300935 * Opt_chk_data_crc: check CRCs when reading data nodes
936 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200937 * Opt_override_compr: override default compressor
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300938 * Opt_err: just end of array marker
939 */
940enum {
941 Opt_fast_unmount,
942 Opt_norm_unmount,
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300943 Opt_bulk_read,
944 Opt_no_bulk_read,
Adrian Hunter2953e732008-09-04 16:26:00 +0300945 Opt_chk_data_crc,
946 Opt_no_chk_data_crc,
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200947 Opt_override_compr,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300948 Opt_err,
949};
950
Steven Whitehousea447c092008-10-13 10:46:57 +0100951static const match_table_t tokens = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300952 {Opt_fast_unmount, "fast_unmount"},
953 {Opt_norm_unmount, "norm_unmount"},
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300954 {Opt_bulk_read, "bulk_read"},
955 {Opt_no_bulk_read, "no_bulk_read"},
Adrian Hunter2953e732008-09-04 16:26:00 +0300956 {Opt_chk_data_crc, "chk_data_crc"},
957 {Opt_no_chk_data_crc, "no_chk_data_crc"},
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200958 {Opt_override_compr, "compr=%s"},
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300959 {Opt_err, NULL},
960};
961
962/**
Artem Bityutskiy8379ea32009-05-29 12:34:52 +0300963 * parse_standard_option - parse a standard mount option.
964 * @option: the option to parse
965 *
966 * Normally, standard mount options like "sync" are passed to file-systems as
967 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
968 * be present in the options string. This function tries to deal with this
969 * situation and parse standard options. Returns 0 if the option was not
970 * recognized, and the corresponding integer flag if it was.
971 *
972 * UBIFS is only interested in the "sync" option, so do not check for anything
973 * else.
974 */
975static int parse_standard_option(const char *option)
976{
977 ubifs_msg("parse %s", option);
978 if (!strcmp(option, "sync"))
979 return MS_SYNCHRONOUS;
980 return 0;
981}
982
983/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300984 * ubifs_parse_options - parse mount parameters.
985 * @c: UBIFS file-system description object
986 * @options: parameters to parse
987 * @is_remount: non-zero if this is FS re-mount
988 *
989 * This function parses UBIFS mount options and returns zero in case success
990 * and a negative error code in case of failure.
991 */
992static int ubifs_parse_options(struct ubifs_info *c, char *options,
993 int is_remount)
994{
995 char *p;
996 substring_t args[MAX_OPT_ARGS];
997
998 if (!options)
999 return 0;
1000
1001 while ((p = strsep(&options, ","))) {
1002 int token;
1003
1004 if (!*p)
1005 continue;
1006
1007 token = match_token(p, tokens, args);
1008 switch (token) {
Artem Bityutskiy27ad2792009-01-29 16:34:30 +02001009 /*
1010 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
Artem Bityutskiycb54ef82009-06-23 20:30:32 +03001011 * We accept them in order to be backward-compatible. But this
Artem Bityutskiy27ad2792009-01-29 16:34:30 +02001012 * should be removed at some point.
1013 */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001014 case Opt_fast_unmount:
1015 c->mount_opts.unmount_mode = 2;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001016 break;
1017 case Opt_norm_unmount:
1018 c->mount_opts.unmount_mode = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001019 break;
Adrian Hunter4793e7c2008-09-02 16:29:46 +03001020 case Opt_bulk_read:
1021 c->mount_opts.bulk_read = 2;
1022 c->bulk_read = 1;
1023 break;
1024 case Opt_no_bulk_read:
1025 c->mount_opts.bulk_read = 1;
1026 c->bulk_read = 0;
1027 break;
Adrian Hunter2953e732008-09-04 16:26:00 +03001028 case Opt_chk_data_crc:
1029 c->mount_opts.chk_data_crc = 2;
1030 c->no_chk_data_crc = 0;
1031 break;
1032 case Opt_no_chk_data_crc:
1033 c->mount_opts.chk_data_crc = 1;
1034 c->no_chk_data_crc = 1;
1035 break;
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001036 case Opt_override_compr:
1037 {
1038 char *name = match_strdup(&args[0]);
1039
1040 if (!name)
1041 return -ENOMEM;
1042 if (!strcmp(name, "none"))
1043 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
1044 else if (!strcmp(name, "lzo"))
1045 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
1046 else if (!strcmp(name, "zlib"))
1047 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
1048 else {
1049 ubifs_err("unknown compressor \"%s\"", name);
1050 kfree(name);
1051 return -EINVAL;
1052 }
1053 kfree(name);
1054 c->mount_opts.override_compr = 1;
1055 c->default_compr = c->mount_opts.compr_type;
1056 break;
1057 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001058 default:
Artem Bityutskiy8379ea32009-05-29 12:34:52 +03001059 {
1060 unsigned long flag;
1061 struct super_block *sb = c->vfs_sb;
1062
1063 flag = parse_standard_option(p);
1064 if (!flag) {
1065 ubifs_err("unrecognized mount option \"%s\" "
1066 "or missing value", p);
1067 return -EINVAL;
1068 }
1069 sb->s_flags |= flag;
1070 break;
1071 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001072 }
1073 }
1074
1075 return 0;
1076}
1077
1078/**
1079 * destroy_journal - destroy journal data structures.
1080 * @c: UBIFS file-system description object
1081 *
1082 * This function destroys journal data structures including those that may have
1083 * been created by recovery functions.
1084 */
1085static void destroy_journal(struct ubifs_info *c)
1086{
1087 while (!list_empty(&c->unclean_leb_list)) {
1088 struct ubifs_unclean_leb *ucleb;
1089
1090 ucleb = list_entry(c->unclean_leb_list.next,
1091 struct ubifs_unclean_leb, list);
1092 list_del(&ucleb->list);
1093 kfree(ucleb);
1094 }
1095 while (!list_empty(&c->old_buds)) {
1096 struct ubifs_bud *bud;
1097
1098 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1099 list_del(&bud->list);
1100 kfree(bud);
1101 }
1102 ubifs_destroy_idx_gc(c);
1103 ubifs_destroy_size_tree(c);
1104 ubifs_tnc_close(c);
1105 free_buds(c);
1106}
1107
1108/**
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001109 * bu_init - initialize bulk-read information.
1110 * @c: UBIFS file-system description object
1111 */
1112static void bu_init(struct ubifs_info *c)
1113{
1114 ubifs_assert(c->bulk_read == 1);
1115
1116 if (c->bu.buf)
1117 return; /* Already initialized */
1118
1119again:
1120 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1121 if (!c->bu.buf) {
1122 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1123 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1124 goto again;
1125 }
1126
1127 /* Just disable bulk-read */
1128 ubifs_warn("Cannot allocate %d bytes of memory for bulk-read, "
1129 "disabling it", c->max_bu_buf_len);
1130 c->mount_opts.bulk_read = 1;
1131 c->bulk_read = 0;
1132 return;
1133 }
1134}
1135
1136/**
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001137 * check_free_space - check if there is enough free space to mount.
1138 * @c: UBIFS file-system description object
1139 *
1140 * This function makes sure UBIFS has enough free space to be mounted in
1141 * read/write mode. UBIFS must always have some free space to allow deletions.
1142 */
1143static int check_free_space(struct ubifs_info *c)
1144{
1145 ubifs_assert(c->dark_wm > 0);
1146 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1147 ubifs_err("insufficient free space to mount in read/write mode");
1148 dbg_dump_budg(c);
1149 dbg_dump_lprops(c);
Artem Bityutskiya2b9df32009-01-29 16:22:54 +02001150 return -ENOSPC;
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001151 }
1152 return 0;
1153}
1154
1155/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001156 * mount_ubifs - mount UBIFS file-system.
1157 * @c: UBIFS file-system description object
1158 *
1159 * This function mounts UBIFS file system. Returns zero in case of success and
1160 * a negative error code in case of failure.
1161 *
1162 * Note, the function does not de-allocate resources it it fails half way
1163 * through, and the caller has to do this instead.
1164 */
1165static int mount_ubifs(struct ubifs_info *c)
1166{
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001167 int err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001168 long long x;
1169 size_t sz;
1170
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001171 c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001172 err = init_constants_early(c);
1173 if (err)
1174 return err;
1175
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001176 err = ubifs_debugging_init(c);
1177 if (err)
1178 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001179
1180 err = check_volume_empty(c);
1181 if (err)
1182 goto out_free;
1183
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001184 if (c->empty && (c->ro_mount || c->ro_media)) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001185 /*
1186 * This UBI volume is empty, and read-only, or the file system
1187 * is mounted read-only - we cannot format it.
1188 */
1189 ubifs_err("can't format empty UBI volume: read-only %s",
1190 c->ro_media ? "UBI volume" : "mount");
1191 err = -EROFS;
1192 goto out_free;
1193 }
1194
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001195 if (c->ro_media && !c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001196 ubifs_err("cannot mount read-write - read-only media");
1197 err = -EROFS;
1198 goto out_free;
1199 }
1200
1201 /*
1202 * The requirement for the buffer is that it should fit indexing B-tree
1203 * height amount of integers. We assume the height if the TNC tree will
1204 * never exceed 64.
1205 */
1206 err = -ENOMEM;
1207 c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
1208 if (!c->bottom_up_buf)
1209 goto out_free;
1210
1211 c->sbuf = vmalloc(c->leb_size);
1212 if (!c->sbuf)
1213 goto out_free;
1214
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001215 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001216 c->ileb_buf = vmalloc(c->leb_size);
1217 if (!c->ileb_buf)
1218 goto out_free;
1219 }
1220
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001221 if (c->bulk_read == 1)
1222 bu_init(c);
1223
Matthew L. Creechd8829622011-03-04 17:55:02 -05001224 if (!c->ro_mount) {
1225 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
1226 GFP_KERNEL);
1227 if (!c->write_reserve_buf)
1228 goto out_free;
1229 }
1230
Artem Bityutskiy18d1d7f2011-01-17 22:27:56 +02001231 c->mounting = 1;
Adrian Hunter2953e732008-09-04 16:26:00 +03001232
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001233 err = ubifs_read_superblock(c);
1234 if (err)
1235 goto out_free;
1236
1237 /*
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001238 * Make sure the compressor which is set as default in the superblock
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001239 * or overridden by mount options is actually compiled in.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001240 */
1241 if (!ubifs_compr_present(c->default_compr)) {
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001242 ubifs_err("'compressor \"%s\" is not compiled in",
1243 ubifs_compr_name(c->default_compr));
Corentin Chary8eec2f32009-05-25 08:49:10 +02001244 err = -ENOTSUPP;
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001245 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001246 }
1247
Artem Bityutskiy79807d02008-12-27 19:18:00 +02001248 err = init_constants_sb(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001249 if (err)
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001250 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001251
1252 sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
1253 sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
1254 c->cbuf = kmalloc(sz, GFP_NOFS);
1255 if (!c->cbuf) {
1256 err = -ENOMEM;
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001257 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001258 }
1259
Artem Bityutskiyb50b9f42011-04-25 18:17:09 +03001260 err = alloc_wbufs(c);
1261 if (err)
1262 goto out_cbuf;
1263
Sebastian Siewior0855f312008-09-09 11:17:29 +02001264 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001265 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001266 /* Create background thread */
Hunter Adrianfcabb342009-03-18 12:29:39 +01001267 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001268 if (IS_ERR(c->bgt)) {
1269 err = PTR_ERR(c->bgt);
1270 c->bgt = NULL;
1271 ubifs_err("cannot spawn \"%s\", error %d",
1272 c->bgt_name, err);
1273 goto out_wbufs;
1274 }
1275 wake_up_process(c->bgt);
1276 }
1277
1278 err = ubifs_read_master(c);
1279 if (err)
1280 goto out_master;
1281
Artem Bityutskiy79807d02008-12-27 19:18:00 +02001282 init_constants_master(c);
1283
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001284 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1285 ubifs_msg("recovery needed");
1286 c->need_recovery = 1;
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001287 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001288 err = ubifs_recover_inl_heads(c, c->sbuf);
1289 if (err)
1290 goto out_master;
1291 }
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001292 } else if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001293 /*
1294 * Set the "dirty" flag so that if we reboot uncleanly we
1295 * will notice this immediately on the next mount.
1296 */
1297 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1298 err = ubifs_write_master(c);
1299 if (err)
1300 goto out_master;
1301 }
1302
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001303 err = ubifs_lpt_init(c, 1, !c->ro_mount);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001304 if (err)
1305 goto out_lpt;
1306
1307 err = dbg_check_idx_size(c, c->old_idx_sz);
1308 if (err)
1309 goto out_lpt;
1310
1311 err = ubifs_replay_journal(c);
1312 if (err)
1313 goto out_journal;
1314
Artem Bityutskiy1fb8bd02009-06-28 18:31:58 +03001315 /* Calculate 'min_idx_lebs' after journal replay */
1316 c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
1317
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001318 err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001319 if (err)
1320 goto out_orphans;
1321
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001322 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001323 int lnum;
1324
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001325 err = check_free_space(c);
1326 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001327 goto out_orphans;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001328
1329 /* Check for enough log space */
1330 lnum = c->lhead_lnum + 1;
1331 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1332 lnum = UBIFS_LOG_LNUM;
1333 if (lnum == c->ltail_lnum) {
1334 err = ubifs_consolidate_log(c);
1335 if (err)
1336 goto out_orphans;
1337 }
1338
1339 if (c->need_recovery) {
1340 err = ubifs_recover_size(c);
1341 if (err)
1342 goto out_orphans;
1343 err = ubifs_rcvry_gc_commit(c);
Artem Bityutskiy276de5d2010-05-23 14:16:13 +03001344 if (err)
1345 goto out_orphans;
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001346 } else {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001347 err = take_gc_lnum(c);
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001348 if (err)
1349 goto out_orphans;
1350
1351 /*
1352 * GC LEB may contain garbage if there was an unclean
1353 * reboot, and it should be un-mapped.
1354 */
1355 err = ubifs_leb_unmap(c, c->gc_lnum);
1356 if (err)
Matthieu CASTETc18de722010-08-02 11:36:06 +02001357 goto out_orphans;
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001358 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001359
1360 err = dbg_check_lprops(c);
1361 if (err)
1362 goto out_orphans;
1363 } else if (c->need_recovery) {
1364 err = ubifs_recover_size(c);
1365 if (err)
1366 goto out_orphans;
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001367 } else {
1368 /*
1369 * Even if we mount read-only, we have to set space in GC LEB
1370 * to proper value because this affects UBIFS free space
1371 * reporting. We do not want to have a situation when
1372 * re-mounting from R/O to R/W changes amount of free space.
1373 */
1374 err = take_gc_lnum(c);
1375 if (err)
1376 goto out_orphans;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001377 }
1378
1379 spin_lock(&ubifs_infos_lock);
1380 list_add_tail(&c->infos_list, &ubifs_infos);
1381 spin_unlock(&ubifs_infos_lock);
1382
1383 if (c->need_recovery) {
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001384 if (c->ro_mount)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001385 ubifs_msg("recovery deferred");
1386 else {
1387 c->need_recovery = 0;
1388 ubifs_msg("recovery completed");
Artem Bityutskiyb2213372009-03-15 17:20:22 +02001389 /*
1390 * GC LEB has to be empty and taken at this point. But
1391 * the journal head LEBs may also be accounted as
1392 * "empty taken" if they are empty.
1393 */
1394 ubifs_assert(c->lst.taken_empty_lebs > 0);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001395 }
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001396 } else
Artem Bityutskiyb2213372009-03-15 17:20:22 +02001397 ubifs_assert(c->lst.taken_empty_lebs > 0);
Artem Bityutskiy552ff312008-10-23 11:49:28 +03001398
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001399 err = dbg_check_filesystem(c);
1400 if (err)
1401 goto out_infos;
1402
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001403 err = dbg_debugfs_init_fs(c);
1404 if (err)
1405 goto out_infos;
1406
Artem Bityutskiy18d1d7f2011-01-17 22:27:56 +02001407 c->mounting = 0;
Adrian Hunter2953e732008-09-04 16:26:00 +03001408
Artem Bityutskiyce769ca2008-07-18 12:54:21 +03001409 ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"",
1410 c->vi.ubi_num, c->vi.vol_id, c->vi.name);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001411 if (c->ro_mount)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001412 ubifs_msg("mounted read-only");
1413 x = (long long)c->main_lebs * c->leb_size;
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001414 ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d "
1415 "LEBs)", x, x >> 10, x >> 20, c->main_lebs);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001416 x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001417 ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d "
1418 "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt);
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001419 ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)",
1420 c->fmt_version, c->ro_compat_version,
1421 UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION);
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001422 ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr));
Artem Bityutskiyfae7fb22008-10-17 18:49:23 +03001423 ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001424 c->report_rp_size, c->report_rp_size >> 10);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001425
1426 dbg_msg("compiled on: " __DATE__ " at " __TIME__);
1427 dbg_msg("min. I/O unit size: %d bytes", c->min_io_size);
Artem Bityutskiy3e8e2e02011-01-30 18:58:32 +02001428 dbg_msg("max. write size: %d bytes", c->max_write_size);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001429 dbg_msg("LEB size: %d bytes (%d KiB)",
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001430 c->leb_size, c->leb_size >> 10);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001431 dbg_msg("data journal heads: %d",
1432 c->jhead_cnt - NONDATA_JHEADS_CNT);
Joe Perches7f2f4e72009-12-14 18:01:13 -08001433 dbg_msg("UUID: %pUB", c->uuid);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001434 dbg_msg("big_lpt %d", c->big_lpt);
1435 dbg_msg("log LEBs: %d (%d - %d)",
1436 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1437 dbg_msg("LPT area LEBs: %d (%d - %d)",
1438 c->lpt_lebs, c->lpt_first, c->lpt_last);
1439 dbg_msg("orphan area LEBs: %d (%d - %d)",
1440 c->orph_lebs, c->orph_first, c->orph_last);
1441 dbg_msg("main area LEBs: %d (%d - %d)",
1442 c->main_lebs, c->main_first, c->leb_cnt - 1);
1443 dbg_msg("index LEBs: %d", c->lst.idx_lebs);
1444 dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)",
1445 c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20);
1446 dbg_msg("key hash type: %d", c->key_hash_type);
1447 dbg_msg("tree fanout: %d", c->fanout);
1448 dbg_msg("reserved GC LEB: %d", c->gc_lnum);
1449 dbg_msg("first main LEB: %d", c->main_first);
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001450 dbg_msg("max. znode size %d", c->max_znode_sz);
1451 dbg_msg("max. index node size %d", c->max_idx_node_sz);
1452 dbg_msg("node sizes: data %zu, inode %zu, dentry %zu",
1453 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1454 dbg_msg("node sizes: trun %zu, sb %zu, master %zu",
1455 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1456 dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu",
1457 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
Artem Bityutskiy6342aae2011-03-08 14:26:47 +02001458 dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001459 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
Artem Bityutskiy6342aae2011-03-08 14:26:47 +02001460 UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001461 dbg_msg("dead watermark: %d", c->dead_wm);
1462 dbg_msg("dark watermark: %d", c->dark_wm);
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001463 dbg_msg("LEB overhead: %d", c->leb_overhead);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001464 x = (long long)c->main_lebs * c->dark_wm;
1465 dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)",
1466 x, x >> 10, x >> 20);
1467 dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1468 c->max_bud_bytes, c->max_bud_bytes >> 10,
1469 c->max_bud_bytes >> 20);
1470 dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1471 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1472 c->bg_bud_bytes >> 20);
1473 dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)",
1474 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1475 dbg_msg("max. seq. number: %llu", c->max_sqnum);
1476 dbg_msg("commit number: %llu", c->cmt_no);
1477
1478 return 0;
1479
1480out_infos:
1481 spin_lock(&ubifs_infos_lock);
1482 list_del(&c->infos_list);
1483 spin_unlock(&ubifs_infos_lock);
1484out_orphans:
1485 free_orphans(c);
1486out_journal:
1487 destroy_journal(c);
1488out_lpt:
1489 ubifs_lpt_free(c, 0);
1490out_master:
1491 kfree(c->mst_node);
1492 kfree(c->rcvrd_mst_node);
1493 if (c->bgt)
1494 kthread_stop(c->bgt);
1495out_wbufs:
1496 free_wbufs(c);
1497out_cbuf:
1498 kfree(c->cbuf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001499out_free:
Matthew L. Creechd8829622011-03-04 17:55:02 -05001500 kfree(c->write_reserve_buf);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001501 kfree(c->bu.buf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001502 vfree(c->ileb_buf);
1503 vfree(c->sbuf);
1504 kfree(c->bottom_up_buf);
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001505 ubifs_debugging_exit(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001506 return err;
1507}
1508
1509/**
1510 * ubifs_umount - un-mount UBIFS file-system.
1511 * @c: UBIFS file-system description object
1512 *
1513 * Note, this function is called to free allocated resourced when un-mounting,
1514 * as well as free resources when an error occurred while we were half way
1515 * through mounting (error path cleanup function). So it has to make sure the
1516 * resource was actually allocated before freeing it.
1517 */
1518static void ubifs_umount(struct ubifs_info *c)
1519{
1520 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1521 c->vi.vol_id);
1522
Artem Bityutskiy552ff312008-10-23 11:49:28 +03001523 dbg_debugfs_exit_fs(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001524 spin_lock(&ubifs_infos_lock);
1525 list_del(&c->infos_list);
1526 spin_unlock(&ubifs_infos_lock);
1527
1528 if (c->bgt)
1529 kthread_stop(c->bgt);
1530
1531 destroy_journal(c);
1532 free_wbufs(c);
1533 free_orphans(c);
1534 ubifs_lpt_free(c, 0);
1535
1536 kfree(c->cbuf);
1537 kfree(c->rcvrd_mst_node);
1538 kfree(c->mst_node);
Matthew L. Creechd8829622011-03-04 17:55:02 -05001539 kfree(c->write_reserve_buf);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001540 kfree(c->bu.buf);
1541 vfree(c->ileb_buf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001542 vfree(c->sbuf);
1543 kfree(c->bottom_up_buf);
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001544 ubifs_debugging_exit(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001545}
1546
1547/**
1548 * ubifs_remount_rw - re-mount in read-write mode.
1549 * @c: UBIFS file-system description object
1550 *
1551 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1552 * mode. This function allocates the needed resources and re-mounts UBIFS in
1553 * read-write mode.
1554 */
1555static int ubifs_remount_rw(struct ubifs_info *c)
1556{
1557 int err, lnum;
1558
Artem Bityutskiy963f0cf2009-03-26 12:51:21 +02001559 if (c->rw_incompat) {
1560 ubifs_err("the file-system is not R/W-compatible");
1561 ubifs_msg("on-flash format version is w%d/r%d, but software "
1562 "only supports up to version w%d/r%d", c->fmt_version,
1563 c->ro_compat_version, UBIFS_FORMAT_VERSION,
1564 UBIFS_RO_COMPAT_VERSION);
1565 return -EROFS;
1566 }
1567
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001568 mutex_lock(&c->umount_mutex);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001569 dbg_save_space_info(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001570 c->remounting_rw = 1;
Artem Bityutskiyc88ac002011-03-29 09:45:21 +03001571 c->ro_mount = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001572
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001573 err = check_free_space(c);
1574 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001575 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001576
1577 if (c->old_leb_cnt != c->leb_cnt) {
1578 struct ubifs_sb_node *sup;
1579
1580 sup = ubifs_read_sb_node(c);
1581 if (IS_ERR(sup)) {
1582 err = PTR_ERR(sup);
1583 goto out;
1584 }
1585 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1586 err = ubifs_write_sb_node(c, sup);
1587 if (err)
1588 goto out;
1589 }
1590
1591 if (c->need_recovery) {
1592 ubifs_msg("completing deferred recovery");
1593 err = ubifs_write_rcvrd_mst_node(c);
1594 if (err)
1595 goto out;
1596 err = ubifs_recover_size(c);
1597 if (err)
1598 goto out;
1599 err = ubifs_clean_lebs(c, c->sbuf);
1600 if (err)
1601 goto out;
1602 err = ubifs_recover_inl_heads(c, c->sbuf);
1603 if (err)
1604 goto out;
Adrian Hunter49d128a2009-01-26 10:55:40 +02001605 } else {
1606 /* A readonly mount is not allowed to have orphans */
1607 ubifs_assert(c->tot_orphans == 0);
1608 err = ubifs_clear_orphans(c);
1609 if (err)
1610 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001611 }
1612
1613 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1614 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1615 err = ubifs_write_master(c);
1616 if (err)
1617 goto out;
1618 }
1619
1620 c->ileb_buf = vmalloc(c->leb_size);
1621 if (!c->ileb_buf) {
1622 err = -ENOMEM;
1623 goto out;
1624 }
1625
Matthew L. Creechd8829622011-03-04 17:55:02 -05001626 c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
1627 if (!c->write_reserve_buf)
1628 goto out;
1629
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001630 err = ubifs_lpt_init(c, 0, 1);
1631 if (err)
1632 goto out;
1633
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001634 /* Create background thread */
Hunter Adrianfcabb342009-03-18 12:29:39 +01001635 c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001636 if (IS_ERR(c->bgt)) {
1637 err = PTR_ERR(c->bgt);
1638 c->bgt = NULL;
1639 ubifs_err("cannot spawn \"%s\", error %d",
1640 c->bgt_name, err);
Adrian Hunter2953e732008-09-04 16:26:00 +03001641 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001642 }
1643 wake_up_process(c->bgt);
1644
1645 c->orph_buf = vmalloc(c->leb_size);
Adrian Hunter2953e732008-09-04 16:26:00 +03001646 if (!c->orph_buf) {
1647 err = -ENOMEM;
1648 goto out;
1649 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001650
1651 /* Check for enough log space */
1652 lnum = c->lhead_lnum + 1;
1653 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1654 lnum = UBIFS_LOG_LNUM;
1655 if (lnum == c->ltail_lnum) {
1656 err = ubifs_consolidate_log(c);
1657 if (err)
1658 goto out;
1659 }
1660
1661 if (c->need_recovery)
1662 err = ubifs_rcvry_gc_commit(c);
1663 else
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001664 err = ubifs_leb_unmap(c, c->gc_lnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001665 if (err)
1666 goto out;
1667
Artem Bityutskiy8c230d92011-04-20 18:02:45 +03001668 dbg_gen("re-mounted read-write");
1669 c->remounting_rw = 0;
1670
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001671 if (c->need_recovery) {
1672 c->need_recovery = 0;
1673 ubifs_msg("deferred recovery completed");
Artem Bityutskiy8c230d92011-04-20 18:02:45 +03001674 } else {
1675 /*
1676 * Do not run the debugging space check if the were doing
1677 * recovery, because when we saved the information we had the
1678 * file-system in a state where the TNC and lprops has been
1679 * modified in memory, but all the I/O operations (including a
1680 * commit) were deferred. So the file-system was in
1681 * "non-committed" state. Now the file-system is in committed
1682 * state, and of course the amount of free space will change
1683 * because, for example, the old index size was imprecise.
1684 */
1685 err = dbg_check_space_info(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001686 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001687 mutex_unlock(&c->umount_mutex);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001688 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001689
1690out:
Artem Bityutskiyc88ac002011-03-29 09:45:21 +03001691 c->ro_mount = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001692 vfree(c->orph_buf);
1693 c->orph_buf = NULL;
1694 if (c->bgt) {
1695 kthread_stop(c->bgt);
1696 c->bgt = NULL;
1697 }
1698 free_wbufs(c);
Matthew L. Creechd8829622011-03-04 17:55:02 -05001699 kfree(c->write_reserve_buf);
1700 c->write_reserve_buf = NULL;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001701 vfree(c->ileb_buf);
1702 c->ileb_buf = NULL;
1703 ubifs_lpt_free(c, 1);
1704 c->remounting_rw = 0;
1705 mutex_unlock(&c->umount_mutex);
1706 return err;
1707}
1708
1709/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001710 * ubifs_remount_ro - re-mount in read-only mode.
1711 * @c: UBIFS file-system description object
1712 *
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001713 * We assume VFS has stopped writing. Possibly the background thread could be
1714 * running a commit, however kthread_stop will wait in that case.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001715 */
1716static void ubifs_remount_ro(struct ubifs_info *c)
1717{
1718 int i, err;
1719
1720 ubifs_assert(!c->need_recovery);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001721 ubifs_assert(!c->ro_mount);
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001722
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001723 mutex_lock(&c->umount_mutex);
1724 if (c->bgt) {
1725 kthread_stop(c->bgt);
1726 c->bgt = NULL;
1727 }
1728
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001729 dbg_save_space_info(c);
1730
Artem Bityutskiy39037552010-10-18 08:28:50 +03001731 for (i = 0; i < c->jhead_cnt; i++)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001732 ubifs_wbuf_sync(&c->jheads[i].wbuf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001733
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001734 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1735 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1736 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1737 err = ubifs_write_master(c);
1738 if (err)
1739 ubifs_ro_mode(c, err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001740
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001741 vfree(c->orph_buf);
1742 c->orph_buf = NULL;
Matthew L. Creechd8829622011-03-04 17:55:02 -05001743 kfree(c->write_reserve_buf);
1744 c->write_reserve_buf = NULL;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001745 vfree(c->ileb_buf);
1746 c->ileb_buf = NULL;
1747 ubifs_lpt_free(c, 1);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001748 c->ro_mount = 1;
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001749 err = dbg_check_space_info(c);
1750 if (err)
1751 ubifs_ro_mode(c, err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001752 mutex_unlock(&c->umount_mutex);
1753}
1754
1755static void ubifs_put_super(struct super_block *sb)
1756{
1757 int i;
1758 struct ubifs_info *c = sb->s_fs_info;
1759
1760 ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num,
1761 c->vi.vol_id);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +02001762
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001763 /*
1764 * The following asserts are only valid if there has not been a failure
1765 * of the media. For example, there will be dirty inodes if we failed
1766 * to write them back because of I/O errors.
1767 */
Artem Bityutskiy1a067a22011-04-21 10:39:54 +03001768 if (!c->ro_error) {
1769 ubifs_assert(atomic_long_read(&c->dirty_pg_cnt) == 0);
1770 ubifs_assert(c->budg_idx_growth == 0);
1771 ubifs_assert(c->budg_dd_growth == 0);
1772 ubifs_assert(c->budg_data_growth == 0);
1773 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001774
1775 /*
1776 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1777 * and file system un-mount. Namely, it prevents the shrinker from
1778 * picking this superblock for shrinking - it will be just skipped if
1779 * the mutex is locked.
1780 */
1781 mutex_lock(&c->umount_mutex);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001782 if (!c->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001783 /*
1784 * First of all kill the background thread to make sure it does
1785 * not interfere with un-mounting and freeing resources.
1786 */
1787 if (c->bgt) {
1788 kthread_stop(c->bgt);
1789 c->bgt = NULL;
1790 }
1791
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001792 /*
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001793 * On fatal errors c->ro_error is set to 1, in which case we do
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001794 * not write the master node.
1795 */
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001796 if (!c->ro_error) {
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001797 int err;
1798
1799 /* Synchronize write-buffers */
Artem Bityutskiy39037552010-10-18 08:28:50 +03001800 for (i = 0; i < c->jhead_cnt; i++)
1801 ubifs_wbuf_sync(&c->jheads[i].wbuf);
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001802
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001803 /*
1804 * We are being cleanly unmounted which means the
1805 * orphans were killed - indicate this in the master
1806 * node. Also save the reserved GC LEB number.
1807 */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001808 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1809 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1810 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1811 err = ubifs_write_master(c);
1812 if (err)
1813 /*
1814 * Recovery will attempt to fix the master area
1815 * next mount, so we just print a message and
1816 * continue to unmount normally.
1817 */
1818 ubifs_err("failed to write master node, "
1819 "error %d", err);
Artem Bityutskiy3601ba22010-10-18 08:32:35 +03001820 } else {
1821 for (i = 0; i < c->jhead_cnt; i++)
1822 /* Make sure write-buffer timers are canceled */
1823 hrtimer_cancel(&c->jheads[i].wbuf.timer);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001824 }
1825 }
1826
1827 ubifs_umount(c);
1828 bdi_destroy(&c->bdi);
1829 ubi_close_volume(c->ubi);
1830 mutex_unlock(&c->umount_mutex);
1831 kfree(c);
1832}
1833
1834static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
1835{
1836 int err;
1837 struct ubifs_info *c = sb->s_fs_info;
1838
1839 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
1840
1841 err = ubifs_parse_options(c, data, 1);
1842 if (err) {
1843 ubifs_err("invalid or unknown remount parameter");
1844 return err;
1845 }
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001846
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001847 if (c->ro_mount && !(*flags & MS_RDONLY)) {
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001848 if (c->ro_error) {
1849 ubifs_msg("cannot re-mount R/W due to prior errors");
1850 return -EROFS;
1851 }
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001852 if (c->ro_media) {
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001853 ubifs_msg("cannot re-mount R/W - UBI volume is R/O");
Artem Bityutskiya2b9df32009-01-29 16:22:54 +02001854 return -EROFS;
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001855 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001856 err = ubifs_remount_rw(c);
Artem Bityutskiye9d6bbc2009-07-19 13:51:04 +03001857 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001858 return err;
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03001859 } else if (!c->ro_mount && (*flags & MS_RDONLY)) {
Artem Bityutskiy2680d722010-09-17 16:44:28 +03001860 if (c->ro_error) {
1861 ubifs_msg("cannot re-mount R/O due to prior errors");
Artem Bityutskiya2b9df32009-01-29 16:22:54 +02001862 return -EROFS;
Adrian Hunterb466f172009-01-29 12:59:33 +02001863 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001864 ubifs_remount_ro(c);
Adrian Hunterb466f172009-01-29 12:59:33 +02001865 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001866
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001867 if (c->bulk_read == 1)
1868 bu_init(c);
1869 else {
1870 dbg_gen("disable bulk-read");
1871 kfree(c->bu.buf);
1872 c->bu.buf = NULL;
1873 }
1874
Artem Bityutskiyb2213372009-03-15 17:20:22 +02001875 ubifs_assert(c->lst.taken_empty_lebs > 0);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001876 return 0;
1877}
1878
Artem Bityutskiye8b81562009-01-15 17:43:23 +02001879const struct super_operations ubifs_super_operations = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001880 .alloc_inode = ubifs_alloc_inode,
1881 .destroy_inode = ubifs_destroy_inode,
1882 .put_super = ubifs_put_super,
1883 .write_inode = ubifs_write_inode,
Al Virod640e1b2010-06-07 00:34:05 -04001884 .evict_inode = ubifs_evict_inode,
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001885 .statfs = ubifs_statfs,
1886 .dirty_inode = ubifs_dirty_inode,
1887 .remount_fs = ubifs_remount_fs,
1888 .show_options = ubifs_show_options,
1889 .sync_fs = ubifs_sync_fs,
1890};
1891
1892/**
1893 * open_ubi - parse UBI device name string and open the UBI device.
1894 * @name: UBI volume name
1895 * @mode: UBI volume open mode
1896 *
Corentin Chary97223242009-09-28 21:10:12 +02001897 * The primary method of mounting UBIFS is by specifying the UBI volume
1898 * character device node path. However, UBIFS may also be mounted withoug any
1899 * character device node using one of the following methods:
1900 *
1901 * o ubiX_Y - mount UBI device number X, volume Y;
1902 * o ubiY - mount UBI device number 0, volume Y;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001903 * o ubiX:NAME - mount UBI device X, volume with name NAME;
1904 * o ubi:NAME - mount UBI device 0, volume with name NAME.
1905 *
1906 * Alternative '!' separator may be used instead of ':' (because some shells
1907 * like busybox may interpret ':' as an NFS host name separator). This function
Corentin Chary97223242009-09-28 21:10:12 +02001908 * returns UBI volume description object in case of success and a negative
1909 * error code in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001910 */
1911static struct ubi_volume_desc *open_ubi(const char *name, int mode)
1912{
Corentin Chary97223242009-09-28 21:10:12 +02001913 struct ubi_volume_desc *ubi;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001914 int dev, vol;
1915 char *endptr;
1916
Corentin Chary97223242009-09-28 21:10:12 +02001917 /* First, try to open using the device node path method */
1918 ubi = ubi_open_volume_path(name, mode);
1919 if (!IS_ERR(ubi))
1920 return ubi;
1921
1922 /* Try the "nodev" method */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001923 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
1924 return ERR_PTR(-EINVAL);
1925
1926 /* ubi:NAME method */
1927 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
1928 return ubi_open_volume_nm(0, name + 4, mode);
1929
1930 if (!isdigit(name[3]))
1931 return ERR_PTR(-EINVAL);
1932
1933 dev = simple_strtoul(name + 3, &endptr, 0);
1934
1935 /* ubiY method */
1936 if (*endptr == '\0')
1937 return ubi_open_volume(0, dev, mode);
1938
1939 /* ubiX_Y method */
1940 if (*endptr == '_' && isdigit(endptr[1])) {
1941 vol = simple_strtoul(endptr + 1, &endptr, 0);
1942 if (*endptr != '\0')
1943 return ERR_PTR(-EINVAL);
1944 return ubi_open_volume(dev, vol, mode);
1945 }
1946
1947 /* ubiX:NAME method */
1948 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
1949 return ubi_open_volume_nm(dev, ++endptr, mode);
1950
1951 return ERR_PTR(-EINVAL);
1952}
1953
1954static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
1955{
1956 struct ubi_volume_desc *ubi = sb->s_fs_info;
1957 struct ubifs_info *c;
1958 struct inode *root;
1959 int err;
1960
1961 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
1962 if (!c)
1963 return -ENOMEM;
1964
1965 spin_lock_init(&c->cnt_lock);
1966 spin_lock_init(&c->cs_lock);
1967 spin_lock_init(&c->buds_lock);
1968 spin_lock_init(&c->space_lock);
1969 spin_lock_init(&c->orphan_lock);
1970 init_rwsem(&c->commit_sem);
1971 mutex_init(&c->lp_mutex);
1972 mutex_init(&c->tnc_mutex);
1973 mutex_init(&c->log_mutex);
1974 mutex_init(&c->mst_mutex);
1975 mutex_init(&c->umount_mutex);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001976 mutex_init(&c->bu_mutex);
Matthew L. Creechd8829622011-03-04 17:55:02 -05001977 mutex_init(&c->write_reserve_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001978 init_waitqueue_head(&c->cmt_wq);
1979 c->buds = RB_ROOT;
1980 c->old_idx = RB_ROOT;
1981 c->size_tree = RB_ROOT;
1982 c->orph_tree = RB_ROOT;
1983 INIT_LIST_HEAD(&c->infos_list);
1984 INIT_LIST_HEAD(&c->idx_gc);
1985 INIT_LIST_HEAD(&c->replay_list);
1986 INIT_LIST_HEAD(&c->replay_buds);
1987 INIT_LIST_HEAD(&c->uncat_list);
1988 INIT_LIST_HEAD(&c->empty_list);
1989 INIT_LIST_HEAD(&c->freeable_list);
1990 INIT_LIST_HEAD(&c->frdi_idx_list);
1991 INIT_LIST_HEAD(&c->unclean_leb_list);
1992 INIT_LIST_HEAD(&c->old_buds);
1993 INIT_LIST_HEAD(&c->orph_list);
1994 INIT_LIST_HEAD(&c->orph_new);
Artem Bityutskiy2bcf0022011-03-10 16:26:32 +02001995 c->no_chk_data_crc = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001996
Artem Bityutskiy8379ea32009-05-29 12:34:52 +03001997 c->vfs_sb = sb;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001998 c->highest_inum = UBIFS_FIRST_INO;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001999 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
2000
2001 ubi_get_volume_info(ubi, &c->vi);
2002 ubi_get_device_info(c->vi.ubi_num, &c->di);
2003
2004 /* Re-open the UBI device in read-write mode */
2005 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
2006 if (IS_ERR(c->ubi)) {
2007 err = PTR_ERR(c->ubi);
2008 goto out_free;
2009 }
2010
2011 /*
Artem Bityutskiy0a883a02008-08-13 14:13:26 +03002012 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002013 * UBIFS, I/O is not deferred, it is done immediately in readpage,
2014 * which means the user would have to wait not just for their own I/O
Artem Bityutskiy0a883a02008-08-13 14:13:26 +03002015 * but the read-ahead I/O as well i.e. completely pointless.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002016 *
2017 * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
2018 */
Jens Axboed9938312009-06-12 14:45:52 +02002019 c->bdi.name = "ubifs",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002020 c->bdi.capabilities = BDI_CAP_MAP_COPY;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002021 err = bdi_init(&c->bdi);
2022 if (err)
2023 goto out_close;
Daniel Mack7fcd9c32009-07-02 17:15:47 +02002024 err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
2025 c->vi.ubi_num, c->vi.vol_id);
Jens Axboea979eff2009-05-29 09:19:23 +02002026 if (err)
2027 goto out_bdi;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002028
2029 err = ubifs_parse_options(c, data, 0);
2030 if (err)
2031 goto out_bdi;
2032
Jens Axboe32a88aa2009-09-16 15:02:33 +02002033 sb->s_bdi = &c->bdi;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002034 sb->s_fs_info = c;
2035 sb->s_magic = UBIFS_SUPER_MAGIC;
2036 sb->s_blocksize = UBIFS_BLOCK_SIZE;
2037 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002038 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
2039 if (c->max_inode_sz > MAX_LFS_FILESIZE)
2040 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
2041 sb->s_op = &ubifs_super_operations;
2042
2043 mutex_lock(&c->umount_mutex);
2044 err = mount_ubifs(c);
2045 if (err) {
2046 ubifs_assert(err < 0);
2047 goto out_unlock;
2048 }
2049
2050 /* Read the root inode */
2051 root = ubifs_iget(sb, UBIFS_ROOT_INO);
2052 if (IS_ERR(root)) {
2053 err = PTR_ERR(root);
2054 goto out_umount;
2055 }
2056
2057 sb->s_root = d_alloc_root(root);
2058 if (!sb->s_root)
2059 goto out_iput;
2060
2061 mutex_unlock(&c->umount_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002062 return 0;
2063
2064out_iput:
2065 iput(root);
2066out_umount:
2067 ubifs_umount(c);
2068out_unlock:
2069 mutex_unlock(&c->umount_mutex);
2070out_bdi:
2071 bdi_destroy(&c->bdi);
2072out_close:
2073 ubi_close_volume(c->ubi);
2074out_free:
2075 kfree(c);
2076 return err;
2077}
2078
2079static int sb_test(struct super_block *sb, void *data)
2080{
2081 dev_t *dev = data;
Artem Bityutskiy7c83f5c2009-05-25 19:23:04 +03002082 struct ubifs_info *c = sb->s_fs_info;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002083
Artem Bityutskiy7c83f5c2009-05-25 19:23:04 +03002084 return c->vi.cdev == *dev;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002085}
2086
Al Viro157d81e2010-07-25 23:52:42 +04002087static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
2088 const char *name, void *data)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002089{
2090 struct ubi_volume_desc *ubi;
2091 struct ubi_volume_info vi;
2092 struct super_block *sb;
2093 int err;
2094
2095 dbg_gen("name %s, flags %#x", name, flags);
2096
2097 /*
2098 * Get UBI device number and volume ID. Mount it read-only so far
2099 * because this might be a new mount point, and UBI allows only one
2100 * read-write user at a time.
2101 */
2102 ubi = open_ubi(name, UBI_READONLY);
2103 if (IS_ERR(ubi)) {
Steffen Sledz54dd55a2010-09-27 14:20:26 +02002104 dbg_err("cannot open \"%s\", error %d",
2105 name, (int)PTR_ERR(ubi));
Al Viro157d81e2010-07-25 23:52:42 +04002106 return ERR_CAST(ubi);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002107 }
2108 ubi_get_volume_info(ubi, &vi);
2109
2110 dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id);
2111
Artem Bityutskiy7c83f5c2009-05-25 19:23:04 +03002112 sb = sget(fs_type, &sb_test, &set_anon_super, &vi.cdev);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002113 if (IS_ERR(sb)) {
2114 err = PTR_ERR(sb);
2115 goto out_close;
2116 }
2117
2118 if (sb->s_root) {
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03002119 struct ubifs_info *c1 = sb->s_fs_info;
2120
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002121 /* A new mount point for already mounted UBIFS */
2122 dbg_gen("this ubi volume is already mounted");
Artem Bityutskiy2ef13292010-09-19 18:34:26 +03002123 if (!!(flags & MS_RDONLY) != c1->ro_mount) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002124 err = -EBUSY;
2125 goto out_deact;
2126 }
2127 } else {
2128 sb->s_flags = flags;
2129 /*
2130 * Pass 'ubi' to 'fill_super()' in sb->s_fs_info where it is
2131 * replaced by 'c'.
2132 */
2133 sb->s_fs_info = ubi;
2134 err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
2135 if (err)
2136 goto out_deact;
2137 /* We do not support atime */
2138 sb->s_flags |= MS_ACTIVE | MS_NOATIME;
2139 }
2140
2141 /* 'fill_super()' opens ubi again so we must close it here */
2142 ubi_close_volume(ubi);
2143
Al Viro157d81e2010-07-25 23:52:42 +04002144 return dget(sb->s_root);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002145
2146out_deact:
Al Viro6f5bbff2009-05-06 01:34:22 -04002147 deactivate_locked_super(sb);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002148out_close:
2149 ubi_close_volume(ubi);
Al Viro157d81e2010-07-25 23:52:42 +04002150 return ERR_PTR(err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002151}
2152
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002153static struct file_system_type ubifs_fs_type = {
2154 .name = "ubifs",
2155 .owner = THIS_MODULE,
Al Viro157d81e2010-07-25 23:52:42 +04002156 .mount = ubifs_mount,
Artem Bityutskiy7c83f5c2009-05-25 19:23:04 +03002157 .kill_sb = kill_anon_super,
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002158};
2159
2160/*
2161 * Inode slab cache constructor.
2162 */
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07002163static void inode_slab_ctor(void *obj)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002164{
2165 struct ubifs_inode *ui = obj;
2166 inode_init_once(&ui->vfs_inode);
2167}
2168
2169static int __init ubifs_init(void)
2170{
2171 int err;
2172
2173 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2174
2175 /* Make sure node sizes are 8-byte aligned */
2176 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2177 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2178 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2179 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2180 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2181 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2182 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2183 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2184 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2185 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2186 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2187
2188 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2189 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2190 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2191 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2192 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2193 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2194
2195 /* Check min. node size */
2196 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2197 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2198 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2199 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2200
2201 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2202 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2203 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2204 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2205
2206 /* Defined node sizes */
2207 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2208 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2209 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2210 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2211
2212 /*
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02002213 * We use 2 bit wide bit-fields to store compression type, which should
2214 * be amended if more compressors are added. The bit-fields are:
Artem Bityutskiy553dea42008-11-01 14:57:49 +02002215 * @compr_type in 'struct ubifs_inode', @default_compr in
2216 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02002217 */
2218 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2219
2220 /*
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002221 * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
2222 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2223 */
2224 if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
2225 ubifs_err("VFS page cache size is %u bytes, but UBIFS requires"
2226 " at least 4096 bytes",
2227 (unsigned int)PAGE_CACHE_SIZE);
2228 return -EINVAL;
2229 }
2230
2231 err = register_filesystem(&ubifs_fs_type);
2232 if (err) {
2233 ubifs_err("cannot register file system, error %d", err);
2234 return err;
2235 }
2236
2237 err = -ENOMEM;
2238 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2239 sizeof(struct ubifs_inode), 0,
2240 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
2241 &inode_slab_ctor);
2242 if (!ubifs_inode_slab)
2243 goto out_reg;
2244
2245 register_shrinker(&ubifs_shrinker_info);
2246
2247 err = ubifs_compressors_init();
2248 if (err)
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002249 goto out_shrinker;
2250
2251 err = dbg_debugfs_init();
2252 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002253 goto out_compr;
2254
2255 return 0;
2256
2257out_compr:
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002258 ubifs_compressors_exit();
2259out_shrinker:
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002260 unregister_shrinker(&ubifs_shrinker_info);
2261 kmem_cache_destroy(ubifs_inode_slab);
2262out_reg:
2263 unregister_filesystem(&ubifs_fs_type);
2264 return err;
2265}
2266/* late_initcall to let compressors initialize first */
2267late_initcall(ubifs_init);
2268
2269static void __exit ubifs_exit(void)
2270{
2271 ubifs_assert(list_empty(&ubifs_infos));
2272 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
2273
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002274 dbg_debugfs_exit();
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002275 ubifs_compressors_exit();
2276 unregister_shrinker(&ubifs_shrinker_info);
2277 kmem_cache_destroy(ubifs_inode_slab);
2278 unregister_filesystem(&ubifs_fs_type);
2279}
2280module_exit(ubifs_exit);
2281
2282MODULE_LICENSE("GPL");
2283MODULE_VERSION(__stringify(UBIFS_VERSION));
2284MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2285MODULE_DESCRIPTION("UBIFS - UBI File System");