blob: dbfc88714716b6dcd8d98499a46d2f138366a1fc [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
275static void ubifs_destroy_inode(struct inode *inode)
276{
277 struct ubifs_inode *ui = ubifs_inode(inode);
278
279 kfree(ui->data);
280 kmem_cache_free(ubifs_inode_slab, inode);
281}
282
283/*
284 * Note, Linux write-back code calls this without 'i_mutex'.
285 */
286static int ubifs_write_inode(struct inode *inode, int wait)
287{
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300288 int err = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300289 struct ubifs_info *c = inode->i_sb->s_fs_info;
290 struct ubifs_inode *ui = ubifs_inode(inode);
291
292 ubifs_assert(!ui->xattr);
293 if (is_bad_inode(inode))
294 return 0;
295
296 mutex_lock(&ui->ui_mutex);
297 /*
298 * Due to races between write-back forced by budgeting
299 * (see 'sync_some_inodes()') and pdflush write-back, the inode may
300 * have already been synchronized, do not do this again. This might
301 * also happen if it was synchronized in an VFS operation, e.g.
302 * 'ubifs_link()'.
303 */
304 if (!ui->dirty) {
305 mutex_unlock(&ui->ui_mutex);
306 return 0;
307 }
308
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300309 /*
310 * As an optimization, do not write orphan inodes to the media just
311 * because this is not needed.
312 */
313 dbg_gen("inode %lu, mode %#x, nlink %u",
314 inode->i_ino, (int)inode->i_mode, inode->i_nlink);
315 if (inode->i_nlink) {
Artem Bityutskiy1f286812008-07-22 12:06:13 +0300316 err = ubifs_jnl_write_inode(c, inode);
Artem Bityutskiyfbfa6c82008-07-22 11:52:52 +0300317 if (err)
318 ubifs_err("can't write inode %lu, error %d",
319 inode->i_ino, err);
320 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300321
322 ui->dirty = 0;
323 mutex_unlock(&ui->ui_mutex);
324 ubifs_release_dirty_inode_budget(c, ui);
325 return err;
326}
327
328static void ubifs_delete_inode(struct inode *inode)
329{
330 int err;
331 struct ubifs_info *c = inode->i_sb->s_fs_info;
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300332 struct ubifs_inode *ui = ubifs_inode(inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300333
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300334 if (ui->xattr)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300335 /*
336 * Extended attribute inode deletions are fully handled in
337 * 'ubifs_removexattr()'. These inodes are special and have
338 * limited usage, so there is nothing to do here.
339 */
340 goto out;
341
Artem Bityutskiy7d32c2b2008-07-18 18:54:29 +0300342 dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300343 ubifs_assert(!atomic_read(&inode->i_count));
344 ubifs_assert(inode->i_nlink == 0);
345
346 truncate_inode_pages(&inode->i_data, 0);
347 if (is_bad_inode(inode))
348 goto out;
349
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300350 ui->ui_size = inode->i_size = 0;
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300351 err = ubifs_jnl_delete_inode(c, inode);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300352 if (err)
353 /*
354 * Worst case we have a lost orphan inode wasting space, so a
Artem Bityutskiy0a883a02008-08-13 14:13:26 +0300355 * simple error message is OK here.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300356 */
Artem Bityutskiyde94eb52008-07-22 13:06:20 +0300357 ubifs_err("can't delete inode %lu, error %d",
358 inode->i_ino, err);
359
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300360out:
Artem Bityutskiy1e0f3582008-07-21 10:59:53 +0300361 if (ui->dirty)
362 ubifs_release_dirty_inode_budget(c, ui);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300363 clear_inode(inode);
364}
365
366static void ubifs_dirty_inode(struct inode *inode)
367{
368 struct ubifs_inode *ui = ubifs_inode(inode);
369
370 ubifs_assert(mutex_is_locked(&ui->ui_mutex));
371 if (!ui->dirty) {
372 ui->dirty = 1;
373 dbg_gen("inode %lu", inode->i_ino);
374 }
375}
376
377static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf)
378{
379 struct ubifs_info *c = dentry->d_sb->s_fs_info;
380 unsigned long long free;
Artem Bityutskiy7c7cbad2008-09-03 14:16:42 +0300381 __le32 *uuid = (__le32 *)c->uuid;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300382
Artem Bityutskiy7dad1812008-08-25 18:58:19 +0300383 free = ubifs_get_free_space(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300384 dbg_gen("free space %lld bytes (%lld blocks)",
385 free, free >> UBIFS_BLOCK_SHIFT);
386
387 buf->f_type = UBIFS_SUPER_MAGIC;
388 buf->f_bsize = UBIFS_BLOCK_SIZE;
389 buf->f_blocks = c->block_cnt;
390 buf->f_bfree = free >> UBIFS_BLOCK_SHIFT;
391 if (free > c->report_rp_size)
392 buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT;
393 else
394 buf->f_bavail = 0;
395 buf->f_files = 0;
396 buf->f_ffree = 0;
397 buf->f_namelen = UBIFS_MAX_NLEN;
Artem Bityutskiy7c7cbad2008-09-03 14:16:42 +0300398 buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]);
399 buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]);
Artem Bityutskiyb4978e92009-01-23 18:23:03 +0200400 ubifs_assert(buf->f_bfree <= c->block_cnt);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300401 return 0;
402}
403
404static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt)
405{
406 struct ubifs_info *c = mnt->mnt_sb->s_fs_info;
407
408 if (c->mount_opts.unmount_mode == 2)
409 seq_printf(s, ",fast_unmount");
410 else if (c->mount_opts.unmount_mode == 1)
411 seq_printf(s, ",norm_unmount");
412
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300413 if (c->mount_opts.bulk_read == 2)
414 seq_printf(s, ",bulk_read");
415 else if (c->mount_opts.bulk_read == 1)
416 seq_printf(s, ",no_bulk_read");
417
Adrian Hunter2953e732008-09-04 16:26:00 +0300418 if (c->mount_opts.chk_data_crc == 2)
419 seq_printf(s, ",chk_data_crc");
420 else if (c->mount_opts.chk_data_crc == 1)
421 seq_printf(s, ",no_chk_data_crc");
422
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200423 if (c->mount_opts.override_compr) {
424 seq_printf(s, ",compr=");
425 seq_printf(s, ubifs_compr_name(c->mount_opts.compr_type));
426 }
427
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300428 return 0;
429}
430
431static int ubifs_sync_fs(struct super_block *sb, int wait)
432{
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200433 int i, err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300434 struct ubifs_info *c = sb->s_fs_info;
Artem Bityutskiy304d4272008-12-28 08:04:17 +0200435 struct writeback_control wbc = {
Artem Bityutskiydedb0d42009-01-09 21:02:37 +0200436 .sync_mode = WB_SYNC_ALL,
Artem Bityutskiy304d4272008-12-28 08:04:17 +0200437 .range_start = 0,
438 .range_end = LLONG_MAX,
439 .nr_to_write = LONG_MAX,
440 };
441
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800442 /*
Artem Bityutskiydedb0d42009-01-09 21:02:37 +0200443 * Zero @wait is just an advisory thing to help the file system shove
444 * lots of data into the queues, and there will be the second
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800445 * '->sync_fs()' call, with non-zero @wait.
446 */
Artem Bityutskiydedb0d42009-01-09 21:02:37 +0200447 if (!wait)
448 return 0;
Artem Bityutskiye8ea1752009-01-06 14:40:23 -0800449
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200450 if (sb->s_flags & MS_RDONLY)
451 return 0;
452
453 /*
454 * Synchronize write buffers, because 'ubifs_run_commit()' does not
455 * do this if it waits for an already running commit.
456 */
457 for (i = 0; i < c->jhead_cnt; i++) {
458 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
459 if (err)
460 return err;
461 }
462
Artem Bityutskiy304d4272008-12-28 08:04:17 +0200463 /*
464 * VFS calls '->sync_fs()' before synchronizing all dirty inodes and
465 * pages, so synchronize them first, then commit the journal. Strictly
466 * speaking, it is not necessary to commit the journal here,
467 * synchronizing write-buffers would be enough. But committing makes
468 * UBIFS free space predictions much more accurate, so we want to let
469 * the user be able to get more accurate results of 'statfs()' after
470 * they synchronize the file system.
471 */
472 generic_sync_sb_inodes(sb, &wbc);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300473
Artem Bityutskiyf1038302008-12-28 08:16:32 +0200474 err = ubifs_run_commit(c);
475 if (err)
476 return err;
Artem Bityutskiy403e12a2008-09-09 12:31:37 +0300477
Artem Bityutskiycb5c6a22008-12-28 08:18:43 +0200478 return ubi_sync(c->vi.ubi_num);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300479}
480
481/**
482 * init_constants_early - initialize UBIFS constants.
483 * @c: UBIFS file-system description object
484 *
485 * This function initialize UBIFS constants which do not need the superblock to
486 * be read. It also checks that the UBI volume satisfies basic UBIFS
487 * requirements. Returns zero in case of success and a negative error code in
488 * case of failure.
489 */
490static int init_constants_early(struct ubifs_info *c)
491{
492 if (c->vi.corrupted) {
493 ubifs_warn("UBI volume is corrupted - read-only mode");
494 c->ro_media = 1;
495 }
496
497 if (c->di.ro_mode) {
498 ubifs_msg("read-only UBI device");
499 c->ro_media = 1;
500 }
501
502 if (c->vi.vol_type == UBI_STATIC_VOLUME) {
503 ubifs_msg("static UBI volume - read-only mode");
504 c->ro_media = 1;
505 }
506
507 c->leb_cnt = c->vi.size;
508 c->leb_size = c->vi.usable_leb_size;
509 c->half_leb_size = c->leb_size / 2;
510 c->min_io_size = c->di.min_io_size;
511 c->min_io_shift = fls(c->min_io_size) - 1;
512
513 if (c->leb_size < UBIFS_MIN_LEB_SZ) {
514 ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
515 c->leb_size, UBIFS_MIN_LEB_SZ);
516 return -EINVAL;
517 }
518
519 if (c->leb_cnt < UBIFS_MIN_LEB_CNT) {
520 ubifs_err("too few LEBs (%d), min. is %d",
521 c->leb_cnt, UBIFS_MIN_LEB_CNT);
522 return -EINVAL;
523 }
524
525 if (!is_power_of_2(c->min_io_size)) {
526 ubifs_err("bad min. I/O size %d", c->min_io_size);
527 return -EINVAL;
528 }
529
530 /*
531 * UBIFS aligns all node to 8-byte boundary, so to make function in
532 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
533 * less than 8.
534 */
535 if (c->min_io_size < 8) {
536 c->min_io_size = 8;
537 c->min_io_shift = 3;
538 }
539
540 c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
541 c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size);
542
543 /*
544 * Initialize node length ranges which are mostly needed for node
545 * length validation.
546 */
547 c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ;
548 c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ;
549 c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ;
550 c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ;
551 c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ;
552 c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ;
553
554 c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ;
555 c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ;
556 c->ranges[UBIFS_ORPH_NODE].min_len =
557 UBIFS_ORPH_NODE_SZ + sizeof(__le64);
558 c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size;
559 c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ;
560 c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ;
561 c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ;
562 c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ;
563 c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ;
564 c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ;
565 /*
566 * Minimum indexing node size is amended later when superblock is
567 * read and the key length is known.
568 */
569 c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ;
570 /*
571 * Maximum indexing node size is amended later when superblock is
572 * read and the fanout is known.
573 */
574 c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX;
575
576 /*
Artem Bityutskiy70782022009-01-19 19:57:27 +0200577 * Initialize dead and dark LEB space watermarks. See gc.c for comments
578 * about these values.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300579 */
580 c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size);
581 c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size);
582
Artem Bityutskiy9bbb5722008-08-22 18:23:22 +0300583 /*
584 * Calculate how many bytes would be wasted at the end of LEB if it was
585 * fully filled with data nodes of maximum size. This is used in
586 * calculations when reporting free space.
587 */
588 c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ;
Artem Bityutskiy39ce81c2008-11-18 18:09:49 +0200589
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300590 /* Buffer size for bulk-reads */
Artem Bityutskiy6c0c42c2008-11-18 20:20:05 +0200591 c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
592 if (c->max_bu_buf_len > c->leb_size)
593 c->max_bu_buf_len = c->leb_size;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300594 return 0;
595}
596
597/**
598 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
599 * @c: UBIFS file-system description object
600 * @lnum: LEB the write-buffer was synchronized to
601 * @free: how many free bytes left in this LEB
602 * @pad: how many bytes were padded
603 *
604 * This is a callback function which is called by the I/O unit when the
605 * write-buffer is synchronized. We need this to correctly maintain space
606 * accounting in bud logical eraseblocks. This function returns zero in case of
607 * success and a negative error code in case of failure.
608 *
609 * This function actually belongs to the journal, but we keep it here because
610 * we want to keep it static.
611 */
612static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad)
613{
614 return ubifs_update_one_lp(c, lnum, free, pad, 0, 0);
615}
616
617/*
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200618 * init_constants_sb - initialize UBIFS constants.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300619 * @c: UBIFS file-system description object
620 *
621 * This is a helper function which initializes various UBIFS constants after
622 * the superblock has been read. It also checks various UBIFS parameters and
623 * makes sure they are all right. Returns zero in case of success and a
624 * negative error code in case of failure.
625 */
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200626static int init_constants_sb(struct ubifs_info *c)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300627{
628 int tmp, err;
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200629 long long tmp64;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300630
631 c->main_bytes = (long long)c->main_lebs * c->leb_size;
632 c->max_znode_sz = sizeof(struct ubifs_znode) +
633 c->fanout * sizeof(struct ubifs_zbranch);
634
635 tmp = ubifs_idx_node_sz(c, 1);
636 c->ranges[UBIFS_IDX_NODE].min_len = tmp;
637 c->min_idx_node_sz = ALIGN(tmp, 8);
638
639 tmp = ubifs_idx_node_sz(c, c->fanout);
640 c->ranges[UBIFS_IDX_NODE].max_len = tmp;
641 c->max_idx_node_sz = ALIGN(tmp, 8);
642
643 /* Make sure LEB size is large enough to fit full commit */
644 tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt;
645 tmp = ALIGN(tmp, c->min_io_size);
646 if (tmp > c->leb_size) {
647 dbg_err("too small LEB size %d, at least %d needed",
648 c->leb_size, tmp);
649 return -EINVAL;
650 }
651
652 /*
653 * Make sure that the log is large enough to fit reference nodes for
654 * all buds plus one reserved LEB.
655 */
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200656 tmp64 = c->max_bud_bytes + c->leb_size - 1;
657 c->max_bud_cnt = div_u64(tmp64, c->leb_size);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300658 tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
659 tmp /= c->leb_size;
660 tmp += 1;
661 if (c->log_lebs < tmp) {
662 dbg_err("too small log %d LEBs, required min. %d LEBs",
663 c->log_lebs, tmp);
664 return -EINVAL;
665 }
666
667 /*
668 * When budgeting we assume worst-case scenarios when the pages are not
669 * be compressed and direntries are of the maximum size.
670 *
671 * Note, data, which may be stored in inodes is budgeted separately, so
672 * it is not included into 'c->inode_budget'.
673 */
674 c->page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE;
675 c->inode_budget = UBIFS_INO_NODE_SZ;
676 c->dent_budget = UBIFS_MAX_DENT_NODE_SZ;
677
678 /*
679 * When the amount of flash space used by buds becomes
680 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
681 * The writers are unblocked when the commit is finished. To avoid
682 * writers to be blocked UBIFS initiates background commit in advance,
683 * when number of bud bytes becomes above the limit defined below.
684 */
685 c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4;
686
687 /*
688 * Ensure minimum journal size. All the bytes in the journal heads are
689 * considered to be used, when calculating the current journal usage.
690 * Consequently, if the journal is too small, UBIFS will treat it as
691 * always full.
692 */
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200693 tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300694 if (c->bg_bud_bytes < tmp64)
695 c->bg_bud_bytes = tmp64;
696 if (c->max_bud_bytes < tmp64 + c->leb_size)
697 c->max_bud_bytes = tmp64 + c->leb_size;
698
699 err = ubifs_calc_lpt_geom(c);
700 if (err)
701 return err;
702
Artem Bityutskiy79807d02008-12-27 19:18:00 +0200703 return 0;
704}
705
706/*
707 * init_constants_master - initialize UBIFS constants.
708 * @c: UBIFS file-system description object
709 *
710 * This is a helper function which initializes various UBIFS constants after
711 * the master node has been read. It also checks various UBIFS parameters and
712 * makes sure they are all right.
713 */
714static void init_constants_master(struct ubifs_info *c)
715{
716 long long tmp64;
717
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300718 c->min_idx_lebs = ubifs_calc_min_idx_lebs(c);
719
720 /*
721 * Calculate total amount of FS blocks. This number is not used
722 * internally because it does not make much sense for UBIFS, but it is
723 * necessary to report something for the 'statfs()' call.
724 *
Artem Bityutskiy7dad1812008-08-25 18:58:19 +0300725 * Subtract the LEB reserved for GC, the LEB which is reserved for
Artem Bityutskiyaf14a1a2008-12-19 19:26:29 +0200726 * deletions, minimum LEBs for the index, and assume only one journal
727 * head is available.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300728 */
Artem Bityutskiyaf14a1a2008-12-19 19:26:29 +0200729 tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
Artem Bityutskiy4d61db42008-12-18 14:06:51 +0200730 tmp64 *= (long long)c->leb_size - c->leb_overhead;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300731 tmp64 = ubifs_reported_space(c, tmp64);
732 c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300733}
734
735/**
736 * take_gc_lnum - reserve GC LEB.
737 * @c: UBIFS file-system description object
738 *
Artem Bityutskiyb4978e92009-01-23 18:23:03 +0200739 * This function ensures that the LEB reserved for garbage collection is marked
740 * as "taken" in lprops. We also have to set free space to LEB size and dirty
741 * space to zero, because lprops may contain out-of-date information if the
742 * file-system was un-mounted before it has been committed. This function
743 * returns zero in case of success and a negative error code in case of
744 * failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300745 */
746static int take_gc_lnum(struct ubifs_info *c)
747{
748 int err;
749
750 if (c->gc_lnum == -1) {
751 ubifs_err("no LEB for GC");
752 return -EINVAL;
753 }
754
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300755 /* And we have to tell lprops that this LEB is taken */
756 err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0,
757 LPROPS_TAKEN, 0, 0);
758 return err;
759}
760
761/**
762 * alloc_wbufs - allocate write-buffers.
763 * @c: UBIFS file-system description object
764 *
765 * This helper function allocates and initializes UBIFS write-buffers. Returns
766 * zero in case of success and %-ENOMEM in case of failure.
767 */
768static int alloc_wbufs(struct ubifs_info *c)
769{
770 int i, err;
771
772 c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead),
773 GFP_KERNEL);
774 if (!c->jheads)
775 return -ENOMEM;
776
777 /* Initialize journal heads */
778 for (i = 0; i < c->jhead_cnt; i++) {
779 INIT_LIST_HEAD(&c->jheads[i].buds_list);
780 err = ubifs_wbuf_init(c, &c->jheads[i].wbuf);
781 if (err)
782 return err;
783
784 c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback;
785 c->jheads[i].wbuf.jhead = i;
786 }
787
788 c->jheads[BASEHD].wbuf.dtype = UBI_SHORTTERM;
789 /*
790 * Garbage Collector head likely contains long-term data and
791 * does not need to be synchronized by timer.
792 */
793 c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM;
794 c->jheads[GCHD].wbuf.timeout = 0;
795
796 return 0;
797}
798
799/**
800 * free_wbufs - free write-buffers.
801 * @c: UBIFS file-system description object
802 */
803static void free_wbufs(struct ubifs_info *c)
804{
805 int i;
806
807 if (c->jheads) {
808 for (i = 0; i < c->jhead_cnt; i++) {
809 kfree(c->jheads[i].wbuf.buf);
810 kfree(c->jheads[i].wbuf.inodes);
811 }
812 kfree(c->jheads);
813 c->jheads = NULL;
814 }
815}
816
817/**
818 * free_orphans - free orphans.
819 * @c: UBIFS file-system description object
820 */
821static void free_orphans(struct ubifs_info *c)
822{
823 struct ubifs_orphan *orph;
824
825 while (c->orph_dnext) {
826 orph = c->orph_dnext;
827 c->orph_dnext = orph->dnext;
828 list_del(&orph->list);
829 kfree(orph);
830 }
831
832 while (!list_empty(&c->orph_list)) {
833 orph = list_entry(c->orph_list.next, struct ubifs_orphan, list);
834 list_del(&orph->list);
835 kfree(orph);
836 dbg_err("orphan list not empty at unmount");
837 }
838
839 vfree(c->orph_buf);
840 c->orph_buf = NULL;
841}
842
843/**
844 * free_buds - free per-bud objects.
845 * @c: UBIFS file-system description object
846 */
847static void free_buds(struct ubifs_info *c)
848{
849 struct rb_node *this = c->buds.rb_node;
850 struct ubifs_bud *bud;
851
852 while (this) {
853 if (this->rb_left)
854 this = this->rb_left;
855 else if (this->rb_right)
856 this = this->rb_right;
857 else {
858 bud = rb_entry(this, struct ubifs_bud, rb);
859 this = rb_parent(this);
860 if (this) {
861 if (this->rb_left == &bud->rb)
862 this->rb_left = NULL;
863 else
864 this->rb_right = NULL;
865 }
866 kfree(bud);
867 }
868 }
869}
870
871/**
872 * check_volume_empty - check if the UBI volume is empty.
873 * @c: UBIFS file-system description object
874 *
875 * This function checks if the UBIFS volume is empty by looking if its LEBs are
876 * mapped or not. The result of checking is stored in the @c->empty variable.
877 * Returns zero in case of success and a negative error code in case of
878 * failure.
879 */
880static int check_volume_empty(struct ubifs_info *c)
881{
882 int lnum, err;
883
884 c->empty = 1;
885 for (lnum = 0; lnum < c->leb_cnt; lnum++) {
886 err = ubi_is_mapped(c->ubi, lnum);
887 if (unlikely(err < 0))
888 return err;
889 if (err == 1) {
890 c->empty = 0;
891 break;
892 }
893
894 cond_resched();
895 }
896
897 return 0;
898}
899
900/*
901 * UBIFS mount options.
902 *
903 * Opt_fast_unmount: do not run a journal commit before un-mounting
904 * Opt_norm_unmount: run a journal commit before un-mounting
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300905 * Opt_bulk_read: enable bulk-reads
906 * Opt_no_bulk_read: disable bulk-reads
Adrian Hunter2953e732008-09-04 16:26:00 +0300907 * Opt_chk_data_crc: check CRCs when reading data nodes
908 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200909 * Opt_override_compr: override default compressor
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300910 * Opt_err: just end of array marker
911 */
912enum {
913 Opt_fast_unmount,
914 Opt_norm_unmount,
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300915 Opt_bulk_read,
916 Opt_no_bulk_read,
Adrian Hunter2953e732008-09-04 16:26:00 +0300917 Opt_chk_data_crc,
918 Opt_no_chk_data_crc,
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200919 Opt_override_compr,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300920 Opt_err,
921};
922
Steven Whitehousea447c092008-10-13 10:46:57 +0100923static const match_table_t tokens = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300924 {Opt_fast_unmount, "fast_unmount"},
925 {Opt_norm_unmount, "norm_unmount"},
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300926 {Opt_bulk_read, "bulk_read"},
927 {Opt_no_bulk_read, "no_bulk_read"},
Adrian Hunter2953e732008-09-04 16:26:00 +0300928 {Opt_chk_data_crc, "chk_data_crc"},
929 {Opt_no_chk_data_crc, "no_chk_data_crc"},
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200930 {Opt_override_compr, "compr=%s"},
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300931 {Opt_err, NULL},
932};
933
934/**
935 * ubifs_parse_options - parse mount parameters.
936 * @c: UBIFS file-system description object
937 * @options: parameters to parse
938 * @is_remount: non-zero if this is FS re-mount
939 *
940 * This function parses UBIFS mount options and returns zero in case success
941 * and a negative error code in case of failure.
942 */
943static int ubifs_parse_options(struct ubifs_info *c, char *options,
944 int is_remount)
945{
946 char *p;
947 substring_t args[MAX_OPT_ARGS];
948
949 if (!options)
950 return 0;
951
952 while ((p = strsep(&options, ","))) {
953 int token;
954
955 if (!*p)
956 continue;
957
958 token = match_token(p, tokens, args);
959 switch (token) {
960 case Opt_fast_unmount:
961 c->mount_opts.unmount_mode = 2;
962 c->fast_unmount = 1;
963 break;
964 case Opt_norm_unmount:
965 c->mount_opts.unmount_mode = 1;
966 c->fast_unmount = 0;
967 break;
Adrian Hunter4793e7c2008-09-02 16:29:46 +0300968 case Opt_bulk_read:
969 c->mount_opts.bulk_read = 2;
970 c->bulk_read = 1;
971 break;
972 case Opt_no_bulk_read:
973 c->mount_opts.bulk_read = 1;
974 c->bulk_read = 0;
975 break;
Adrian Hunter2953e732008-09-04 16:26:00 +0300976 case Opt_chk_data_crc:
977 c->mount_opts.chk_data_crc = 2;
978 c->no_chk_data_crc = 0;
979 break;
980 case Opt_no_chk_data_crc:
981 c->mount_opts.chk_data_crc = 1;
982 c->no_chk_data_crc = 1;
983 break;
Artem Bityutskiy553dea42008-11-01 14:57:49 +0200984 case Opt_override_compr:
985 {
986 char *name = match_strdup(&args[0]);
987
988 if (!name)
989 return -ENOMEM;
990 if (!strcmp(name, "none"))
991 c->mount_opts.compr_type = UBIFS_COMPR_NONE;
992 else if (!strcmp(name, "lzo"))
993 c->mount_opts.compr_type = UBIFS_COMPR_LZO;
994 else if (!strcmp(name, "zlib"))
995 c->mount_opts.compr_type = UBIFS_COMPR_ZLIB;
996 else {
997 ubifs_err("unknown compressor \"%s\"", name);
998 kfree(name);
999 return -EINVAL;
1000 }
1001 kfree(name);
1002 c->mount_opts.override_compr = 1;
1003 c->default_compr = c->mount_opts.compr_type;
1004 break;
1005 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001006 default:
1007 ubifs_err("unrecognized mount option \"%s\" "
1008 "or missing value", p);
1009 return -EINVAL;
1010 }
1011 }
1012
1013 return 0;
1014}
1015
1016/**
1017 * destroy_journal - destroy journal data structures.
1018 * @c: UBIFS file-system description object
1019 *
1020 * This function destroys journal data structures including those that may have
1021 * been created by recovery functions.
1022 */
1023static void destroy_journal(struct ubifs_info *c)
1024{
1025 while (!list_empty(&c->unclean_leb_list)) {
1026 struct ubifs_unclean_leb *ucleb;
1027
1028 ucleb = list_entry(c->unclean_leb_list.next,
1029 struct ubifs_unclean_leb, list);
1030 list_del(&ucleb->list);
1031 kfree(ucleb);
1032 }
1033 while (!list_empty(&c->old_buds)) {
1034 struct ubifs_bud *bud;
1035
1036 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
1037 list_del(&bud->list);
1038 kfree(bud);
1039 }
1040 ubifs_destroy_idx_gc(c);
1041 ubifs_destroy_size_tree(c);
1042 ubifs_tnc_close(c);
1043 free_buds(c);
1044}
1045
1046/**
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001047 * bu_init - initialize bulk-read information.
1048 * @c: UBIFS file-system description object
1049 */
1050static void bu_init(struct ubifs_info *c)
1051{
1052 ubifs_assert(c->bulk_read == 1);
1053
1054 if (c->bu.buf)
1055 return; /* Already initialized */
1056
1057again:
1058 c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
1059 if (!c->bu.buf) {
1060 if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
1061 c->max_bu_buf_len = UBIFS_KMALLOC_OK;
1062 goto again;
1063 }
1064
1065 /* Just disable bulk-read */
1066 ubifs_warn("Cannot allocate %d bytes of memory for bulk-read, "
1067 "disabling it", c->max_bu_buf_len);
1068 c->mount_opts.bulk_read = 1;
1069 c->bulk_read = 0;
1070 return;
1071 }
1072}
1073
1074/**
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001075 * check_free_space - check if there is enough free space to mount.
1076 * @c: UBIFS file-system description object
1077 *
1078 * This function makes sure UBIFS has enough free space to be mounted in
1079 * read/write mode. UBIFS must always have some free space to allow deletions.
1080 */
1081static int check_free_space(struct ubifs_info *c)
1082{
1083 ubifs_assert(c->dark_wm > 0);
1084 if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) {
1085 ubifs_err("insufficient free space to mount in read/write mode");
1086 dbg_dump_budg(c);
1087 dbg_dump_lprops(c);
1088 /*
1089 * We return %-EINVAL instead of %-ENOSPC because it seems to
1090 * be the closest error code mentioned in the mount function
1091 * documentation.
1092 */
1093 return -EINVAL;
1094 }
1095 return 0;
1096}
1097
1098/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001099 * mount_ubifs - mount UBIFS file-system.
1100 * @c: UBIFS file-system description object
1101 *
1102 * This function mounts UBIFS file system. Returns zero in case of success and
1103 * a negative error code in case of failure.
1104 *
1105 * Note, the function does not de-allocate resources it it fails half way
1106 * through, and the caller has to do this instead.
1107 */
1108static int mount_ubifs(struct ubifs_info *c)
1109{
1110 struct super_block *sb = c->vfs_sb;
1111 int err, mounted_read_only = (sb->s_flags & MS_RDONLY);
1112 long long x;
1113 size_t sz;
1114
1115 err = init_constants_early(c);
1116 if (err)
1117 return err;
1118
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001119 err = ubifs_debugging_init(c);
1120 if (err)
1121 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001122
1123 err = check_volume_empty(c);
1124 if (err)
1125 goto out_free;
1126
1127 if (c->empty && (mounted_read_only || c->ro_media)) {
1128 /*
1129 * This UBI volume is empty, and read-only, or the file system
1130 * is mounted read-only - we cannot format it.
1131 */
1132 ubifs_err("can't format empty UBI volume: read-only %s",
1133 c->ro_media ? "UBI volume" : "mount");
1134 err = -EROFS;
1135 goto out_free;
1136 }
1137
1138 if (c->ro_media && !mounted_read_only) {
1139 ubifs_err("cannot mount read-write - read-only media");
1140 err = -EROFS;
1141 goto out_free;
1142 }
1143
1144 /*
1145 * The requirement for the buffer is that it should fit indexing B-tree
1146 * height amount of integers. We assume the height if the TNC tree will
1147 * never exceed 64.
1148 */
1149 err = -ENOMEM;
1150 c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL);
1151 if (!c->bottom_up_buf)
1152 goto out_free;
1153
1154 c->sbuf = vmalloc(c->leb_size);
1155 if (!c->sbuf)
1156 goto out_free;
1157
1158 if (!mounted_read_only) {
1159 c->ileb_buf = vmalloc(c->leb_size);
1160 if (!c->ileb_buf)
1161 goto out_free;
1162 }
1163
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001164 if (c->bulk_read == 1)
1165 bu_init(c);
1166
1167 /*
1168 * We have to check all CRCs, even for data nodes, when we mount the FS
1169 * (specifically, when we are replaying).
1170 */
Adrian Hunter2953e732008-09-04 16:26:00 +03001171 c->always_chk_crc = 1;
1172
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001173 err = ubifs_read_superblock(c);
1174 if (err)
1175 goto out_free;
1176
1177 /*
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001178 * Make sure the compressor which is set as default in the superblock
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001179 * or overridden by mount options is actually compiled in.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001180 */
1181 if (!ubifs_compr_present(c->default_compr)) {
Artem Bityutskiy553dea42008-11-01 14:57:49 +02001182 ubifs_err("'compressor \"%s\" is not compiled in",
1183 ubifs_compr_name(c->default_compr));
1184 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001185 }
1186
Artem Bityutskiy79807d02008-12-27 19:18:00 +02001187 err = init_constants_sb(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001188 if (err)
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001189 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001190
1191 sz = ALIGN(c->max_idx_node_sz, c->min_io_size);
1192 sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size);
1193 c->cbuf = kmalloc(sz, GFP_NOFS);
1194 if (!c->cbuf) {
1195 err = -ENOMEM;
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001196 goto out_free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001197 }
1198
Sebastian Siewior0855f312008-09-09 11:17:29 +02001199 sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001200 if (!mounted_read_only) {
1201 err = alloc_wbufs(c);
1202 if (err)
1203 goto out_cbuf;
1204
1205 /* Create background thread */
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001206 c->bgt = kthread_create(ubifs_bg_thread, c, c->bgt_name);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001207 if (IS_ERR(c->bgt)) {
1208 err = PTR_ERR(c->bgt);
1209 c->bgt = NULL;
1210 ubifs_err("cannot spawn \"%s\", error %d",
1211 c->bgt_name, err);
1212 goto out_wbufs;
1213 }
1214 wake_up_process(c->bgt);
1215 }
1216
1217 err = ubifs_read_master(c);
1218 if (err)
1219 goto out_master;
1220
Artem Bityutskiy79807d02008-12-27 19:18:00 +02001221 init_constants_master(c);
1222
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001223 if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) {
1224 ubifs_msg("recovery needed");
1225 c->need_recovery = 1;
1226 if (!mounted_read_only) {
1227 err = ubifs_recover_inl_heads(c, c->sbuf);
1228 if (err)
1229 goto out_master;
1230 }
1231 } else if (!mounted_read_only) {
1232 /*
1233 * Set the "dirty" flag so that if we reboot uncleanly we
1234 * will notice this immediately on the next mount.
1235 */
1236 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1237 err = ubifs_write_master(c);
1238 if (err)
1239 goto out_master;
1240 }
1241
1242 err = ubifs_lpt_init(c, 1, !mounted_read_only);
1243 if (err)
1244 goto out_lpt;
1245
1246 err = dbg_check_idx_size(c, c->old_idx_sz);
1247 if (err)
1248 goto out_lpt;
1249
1250 err = ubifs_replay_journal(c);
1251 if (err)
1252 goto out_journal;
1253
1254 err = ubifs_mount_orphans(c, c->need_recovery, mounted_read_only);
1255 if (err)
1256 goto out_orphans;
1257
1258 if (!mounted_read_only) {
1259 int lnum;
1260
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001261 err = check_free_space(c);
1262 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001263 goto out_orphans;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001264
1265 /* Check for enough log space */
1266 lnum = c->lhead_lnum + 1;
1267 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1268 lnum = UBIFS_LOG_LNUM;
1269 if (lnum == c->ltail_lnum) {
1270 err = ubifs_consolidate_log(c);
1271 if (err)
1272 goto out_orphans;
1273 }
1274
1275 if (c->need_recovery) {
1276 err = ubifs_recover_size(c);
1277 if (err)
1278 goto out_orphans;
1279 err = ubifs_rcvry_gc_commit(c);
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001280 } else {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001281 err = take_gc_lnum(c);
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001282 if (err)
1283 goto out_orphans;
1284
1285 /*
1286 * GC LEB may contain garbage if there was an unclean
1287 * reboot, and it should be un-mapped.
1288 */
1289 err = ubifs_leb_unmap(c, c->gc_lnum);
1290 if (err)
1291 return err;
1292 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001293
1294 err = dbg_check_lprops(c);
1295 if (err)
1296 goto out_orphans;
1297 } else if (c->need_recovery) {
1298 err = ubifs_recover_size(c);
1299 if (err)
1300 goto out_orphans;
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001301 } else {
1302 /*
1303 * Even if we mount read-only, we have to set space in GC LEB
1304 * to proper value because this affects UBIFS free space
1305 * reporting. We do not want to have a situation when
1306 * re-mounting from R/O to R/W changes amount of free space.
1307 */
1308 err = take_gc_lnum(c);
1309 if (err)
1310 goto out_orphans;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001311 }
1312
1313 spin_lock(&ubifs_infos_lock);
1314 list_add_tail(&c->infos_list, &ubifs_infos);
1315 spin_unlock(&ubifs_infos_lock);
1316
1317 if (c->need_recovery) {
1318 if (mounted_read_only)
1319 ubifs_msg("recovery deferred");
1320 else {
1321 c->need_recovery = 0;
1322 ubifs_msg("recovery completed");
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001323 /* GC LEB has to be empty and taken at this point */
1324 ubifs_assert(c->lst.taken_empty_lebs == 1);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001325 }
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001326 } else
1327 ubifs_assert(c->lst.taken_empty_lebs == 1);
Artem Bityutskiy552ff312008-10-23 11:49:28 +03001328
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001329 err = dbg_check_filesystem(c);
1330 if (err)
1331 goto out_infos;
1332
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001333 err = dbg_debugfs_init_fs(c);
1334 if (err)
1335 goto out_infos;
1336
Adrian Hunter2953e732008-09-04 16:26:00 +03001337 c->always_chk_crc = 0;
1338
Artem Bityutskiyce769ca2008-07-18 12:54:21 +03001339 ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"",
1340 c->vi.ubi_num, c->vi.vol_id, c->vi.name);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001341 if (mounted_read_only)
1342 ubifs_msg("mounted read-only");
1343 x = (long long)c->main_lebs * c->leb_size;
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001344 ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d "
1345 "LEBs)", x, x >> 10, x >> 20, c->main_lebs);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001346 x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes;
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001347 ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d "
1348 "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt);
1349 ubifs_msg("media format: %d (latest is %d)",
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001350 c->fmt_version, UBIFS_FORMAT_VERSION);
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001351 ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr));
Artem Bityutskiyfae7fb22008-10-17 18:49:23 +03001352 ubifs_msg("reserved for root: %llu bytes (%llu KiB)",
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001353 c->report_rp_size, c->report_rp_size >> 10);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001354
1355 dbg_msg("compiled on: " __DATE__ " at " __TIME__);
1356 dbg_msg("min. I/O unit size: %d bytes", c->min_io_size);
1357 dbg_msg("LEB size: %d bytes (%d KiB)",
Artem Bityutskiy948cfb22008-08-20 11:56:33 +03001358 c->leb_size, c->leb_size >> 10);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001359 dbg_msg("data journal heads: %d",
1360 c->jhead_cnt - NONDATA_JHEADS_CNT);
1361 dbg_msg("UUID: %02X%02X%02X%02X-%02X%02X"
1362 "-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
1363 c->uuid[0], c->uuid[1], c->uuid[2], c->uuid[3],
1364 c->uuid[4], c->uuid[5], c->uuid[6], c->uuid[7],
1365 c->uuid[8], c->uuid[9], c->uuid[10], c->uuid[11],
1366 c->uuid[12], c->uuid[13], c->uuid[14], c->uuid[15]);
1367 dbg_msg("fast unmount: %d", c->fast_unmount);
1368 dbg_msg("big_lpt %d", c->big_lpt);
1369 dbg_msg("log LEBs: %d (%d - %d)",
1370 c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
1371 dbg_msg("LPT area LEBs: %d (%d - %d)",
1372 c->lpt_lebs, c->lpt_first, c->lpt_last);
1373 dbg_msg("orphan area LEBs: %d (%d - %d)",
1374 c->orph_lebs, c->orph_first, c->orph_last);
1375 dbg_msg("main area LEBs: %d (%d - %d)",
1376 c->main_lebs, c->main_first, c->leb_cnt - 1);
1377 dbg_msg("index LEBs: %d", c->lst.idx_lebs);
1378 dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)",
1379 c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20);
1380 dbg_msg("key hash type: %d", c->key_hash_type);
1381 dbg_msg("tree fanout: %d", c->fanout);
1382 dbg_msg("reserved GC LEB: %d", c->gc_lnum);
1383 dbg_msg("first main LEB: %d", c->main_first);
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001384 dbg_msg("max. znode size %d", c->max_znode_sz);
1385 dbg_msg("max. index node size %d", c->max_idx_node_sz);
1386 dbg_msg("node sizes: data %zu, inode %zu, dentry %zu",
1387 UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ);
1388 dbg_msg("node sizes: trun %zu, sb %zu, master %zu",
1389 UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
1390 dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu",
1391 UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
1392 dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu",
1393 UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
1394 UBIFS_MAX_DENT_NODE_SZ);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001395 dbg_msg("dead watermark: %d", c->dead_wm);
1396 dbg_msg("dark watermark: %d", c->dark_wm);
Artem Bityutskiy8e5033a2008-12-30 18:37:45 +02001397 dbg_msg("LEB overhead: %d", c->leb_overhead);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001398 x = (long long)c->main_lebs * c->dark_wm;
1399 dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)",
1400 x, x >> 10, x >> 20);
1401 dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1402 c->max_bud_bytes, c->max_bud_bytes >> 10,
1403 c->max_bud_bytes >> 20);
1404 dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1405 c->bg_bud_bytes, c->bg_bud_bytes >> 10,
1406 c->bg_bud_bytes >> 20);
1407 dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)",
1408 c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20);
1409 dbg_msg("max. seq. number: %llu", c->max_sqnum);
1410 dbg_msg("commit number: %llu", c->cmt_no);
1411
1412 return 0;
1413
1414out_infos:
1415 spin_lock(&ubifs_infos_lock);
1416 list_del(&c->infos_list);
1417 spin_unlock(&ubifs_infos_lock);
1418out_orphans:
1419 free_orphans(c);
1420out_journal:
1421 destroy_journal(c);
1422out_lpt:
1423 ubifs_lpt_free(c, 0);
1424out_master:
1425 kfree(c->mst_node);
1426 kfree(c->rcvrd_mst_node);
1427 if (c->bgt)
1428 kthread_stop(c->bgt);
1429out_wbufs:
1430 free_wbufs(c);
1431out_cbuf:
1432 kfree(c->cbuf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001433out_free:
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001434 kfree(c->bu.buf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001435 vfree(c->ileb_buf);
1436 vfree(c->sbuf);
1437 kfree(c->bottom_up_buf);
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001438 ubifs_debugging_exit(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001439 return err;
1440}
1441
1442/**
1443 * ubifs_umount - un-mount UBIFS file-system.
1444 * @c: UBIFS file-system description object
1445 *
1446 * Note, this function is called to free allocated resourced when un-mounting,
1447 * as well as free resources when an error occurred while we were half way
1448 * through mounting (error path cleanup function). So it has to make sure the
1449 * resource was actually allocated before freeing it.
1450 */
1451static void ubifs_umount(struct ubifs_info *c)
1452{
1453 dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num,
1454 c->vi.vol_id);
1455
Artem Bityutskiy552ff312008-10-23 11:49:28 +03001456 dbg_debugfs_exit_fs(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001457 spin_lock(&ubifs_infos_lock);
1458 list_del(&c->infos_list);
1459 spin_unlock(&ubifs_infos_lock);
1460
1461 if (c->bgt)
1462 kthread_stop(c->bgt);
1463
1464 destroy_journal(c);
1465 free_wbufs(c);
1466 free_orphans(c);
1467 ubifs_lpt_free(c, 0);
1468
1469 kfree(c->cbuf);
1470 kfree(c->rcvrd_mst_node);
1471 kfree(c->mst_node);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001472 kfree(c->bu.buf);
1473 vfree(c->ileb_buf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001474 vfree(c->sbuf);
1475 kfree(c->bottom_up_buf);
Artem Bityutskiy17c2f9f2008-10-17 13:31:39 +03001476 ubifs_debugging_exit(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001477}
1478
1479/**
1480 * ubifs_remount_rw - re-mount in read-write mode.
1481 * @c: UBIFS file-system description object
1482 *
1483 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1484 * mode. This function allocates the needed resources and re-mounts UBIFS in
1485 * read-write mode.
1486 */
1487static int ubifs_remount_rw(struct ubifs_info *c)
1488{
1489 int err, lnum;
1490
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001491 mutex_lock(&c->umount_mutex);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001492 dbg_save_space_info(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001493 c->remounting_rw = 1;
Adrian Hunter2953e732008-09-04 16:26:00 +03001494 c->always_chk_crc = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001495
Artem Bityutskiy57a450e2008-12-30 16:23:34 +02001496 err = check_free_space(c);
1497 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001498 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001499
1500 if (c->old_leb_cnt != c->leb_cnt) {
1501 struct ubifs_sb_node *sup;
1502
1503 sup = ubifs_read_sb_node(c);
1504 if (IS_ERR(sup)) {
1505 err = PTR_ERR(sup);
1506 goto out;
1507 }
1508 sup->leb_cnt = cpu_to_le32(c->leb_cnt);
1509 err = ubifs_write_sb_node(c, sup);
1510 if (err)
1511 goto out;
1512 }
1513
1514 if (c->need_recovery) {
1515 ubifs_msg("completing deferred recovery");
1516 err = ubifs_write_rcvrd_mst_node(c);
1517 if (err)
1518 goto out;
1519 err = ubifs_recover_size(c);
1520 if (err)
1521 goto out;
1522 err = ubifs_clean_lebs(c, c->sbuf);
1523 if (err)
1524 goto out;
1525 err = ubifs_recover_inl_heads(c, c->sbuf);
1526 if (err)
1527 goto out;
Adrian Hunter49d128a2009-01-26 10:55:40 +02001528 } else {
1529 /* A readonly mount is not allowed to have orphans */
1530 ubifs_assert(c->tot_orphans == 0);
1531 err = ubifs_clear_orphans(c);
1532 if (err)
1533 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001534 }
1535
1536 if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) {
1537 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY);
1538 err = ubifs_write_master(c);
1539 if (err)
1540 goto out;
1541 }
1542
1543 c->ileb_buf = vmalloc(c->leb_size);
1544 if (!c->ileb_buf) {
1545 err = -ENOMEM;
1546 goto out;
1547 }
1548
1549 err = ubifs_lpt_init(c, 0, 1);
1550 if (err)
1551 goto out;
1552
1553 err = alloc_wbufs(c);
1554 if (err)
1555 goto out;
1556
1557 ubifs_create_buds_lists(c);
1558
1559 /* Create background thread */
1560 c->bgt = kthread_create(ubifs_bg_thread, c, c->bgt_name);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001561 if (IS_ERR(c->bgt)) {
1562 err = PTR_ERR(c->bgt);
1563 c->bgt = NULL;
1564 ubifs_err("cannot spawn \"%s\", error %d",
1565 c->bgt_name, err);
Adrian Hunter2953e732008-09-04 16:26:00 +03001566 goto out;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001567 }
1568 wake_up_process(c->bgt);
1569
1570 c->orph_buf = vmalloc(c->leb_size);
Adrian Hunter2953e732008-09-04 16:26:00 +03001571 if (!c->orph_buf) {
1572 err = -ENOMEM;
1573 goto out;
1574 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001575
1576 /* Check for enough log space */
1577 lnum = c->lhead_lnum + 1;
1578 if (lnum >= UBIFS_LOG_LNUM + c->log_lebs)
1579 lnum = UBIFS_LOG_LNUM;
1580 if (lnum == c->ltail_lnum) {
1581 err = ubifs_consolidate_log(c);
1582 if (err)
1583 goto out;
1584 }
1585
1586 if (c->need_recovery)
1587 err = ubifs_rcvry_gc_commit(c);
1588 else
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001589 err = ubifs_leb_unmap(c, c->gc_lnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001590 if (err)
1591 goto out;
1592
1593 if (c->need_recovery) {
1594 c->need_recovery = 0;
1595 ubifs_msg("deferred recovery completed");
1596 }
1597
1598 dbg_gen("re-mounted read-write");
1599 c->vfs_sb->s_flags &= ~MS_RDONLY;
1600 c->remounting_rw = 0;
Adrian Hunter2953e732008-09-04 16:26:00 +03001601 c->always_chk_crc = 0;
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001602 err = dbg_check_space_info(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001603 mutex_unlock(&c->umount_mutex);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001604 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001605
1606out:
1607 vfree(c->orph_buf);
1608 c->orph_buf = NULL;
1609 if (c->bgt) {
1610 kthread_stop(c->bgt);
1611 c->bgt = NULL;
1612 }
1613 free_wbufs(c);
1614 vfree(c->ileb_buf);
1615 c->ileb_buf = NULL;
1616 ubifs_lpt_free(c, 1);
1617 c->remounting_rw = 0;
Adrian Hunter2953e732008-09-04 16:26:00 +03001618 c->always_chk_crc = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001619 mutex_unlock(&c->umount_mutex);
1620 return err;
1621}
1622
1623/**
1624 * commit_on_unmount - commit the journal when un-mounting.
1625 * @c: UBIFS file-system description object
1626 *
Artem Bityutskiyaf2eb562008-09-09 12:23:50 +03001627 * This function is called during un-mounting and re-mounting, and it commits
Artem Bityutskiy26d05772008-12-28 09:11:02 +02001628 * the journal unless the "fast unmount" mode is enabled.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001629 */
1630static void commit_on_unmount(struct ubifs_info *c)
1631{
Artem Bityutskiy26d05772008-12-28 09:11:02 +02001632 long long bud_bytes;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001633
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001634 if (!c->fast_unmount) {
1635 dbg_gen("skip committing - fast unmount enabled");
1636 return;
1637 }
1638
Artem Bityutskiy26d05772008-12-28 09:11:02 +02001639 /*
1640 * This function is called before the background thread is stopped, so
1641 * we may race with ongoing commit, which means we have to take
1642 * @c->bud_lock to access @c->bud_bytes.
1643 */
1644 spin_lock(&c->buds_lock);
1645 bud_bytes = c->bud_bytes;
1646 spin_unlock(&c->buds_lock);
1647
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001648 if (bud_bytes) {
1649 dbg_gen("run commit");
Artem Bityutskiy26d05772008-12-28 09:11:02 +02001650 ubifs_run_commit(c);
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001651 } else
1652 dbg_gen("journal is empty, do not run commit");
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001653}
1654
1655/**
1656 * ubifs_remount_ro - re-mount in read-only mode.
1657 * @c: UBIFS file-system description object
1658 *
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001659 * We assume VFS has stopped writing. Possibly the background thread could be
1660 * running a commit, however kthread_stop will wait in that case.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001661 */
1662static void ubifs_remount_ro(struct ubifs_info *c)
1663{
1664 int i, err;
1665
1666 ubifs_assert(!c->need_recovery);
Artem Bityutskiy6ba87c92009-01-26 16:12:20 +02001667 ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY));
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001668
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001669 commit_on_unmount(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001670 mutex_lock(&c->umount_mutex);
1671 if (c->bgt) {
1672 kthread_stop(c->bgt);
1673 c->bgt = NULL;
1674 }
1675
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001676 dbg_save_space_info(c);
1677
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001678 for (i = 0; i < c->jhead_cnt; i++) {
1679 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1680 del_timer_sync(&c->jheads[i].wbuf.timer);
1681 }
1682
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001683 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1684 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1685 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1686 err = ubifs_write_master(c);
1687 if (err)
1688 ubifs_ro_mode(c, err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001689
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001690 err = ubifs_destroy_idx_gc(c);
1691 if (err)
1692 ubifs_ro_mode(c, err);
1693
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001694 free_wbufs(c);
1695 vfree(c->orph_buf);
1696 c->orph_buf = NULL;
1697 vfree(c->ileb_buf);
1698 c->ileb_buf = NULL;
1699 ubifs_lpt_free(c, 1);
Artem Bityutskiy84abf972009-01-23 14:54:59 +02001700 err = dbg_check_space_info(c);
1701 if (err)
1702 ubifs_ro_mode(c, err);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001703 mutex_unlock(&c->umount_mutex);
1704}
1705
1706static void ubifs_put_super(struct super_block *sb)
1707{
1708 int i;
1709 struct ubifs_info *c = sb->s_fs_info;
1710
1711 ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num,
1712 c->vi.vol_id);
1713 /*
1714 * The following asserts are only valid if there has not been a failure
1715 * of the media. For example, there will be dirty inodes if we failed
1716 * to write them back because of I/O errors.
1717 */
1718 ubifs_assert(atomic_long_read(&c->dirty_pg_cnt) == 0);
1719 ubifs_assert(c->budg_idx_growth == 0);
Artem Bityutskiy7d32c2b2008-07-18 18:54:29 +03001720 ubifs_assert(c->budg_dd_growth == 0);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001721 ubifs_assert(c->budg_data_growth == 0);
1722
1723 /*
1724 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1725 * and file system un-mount. Namely, it prevents the shrinker from
1726 * picking this superblock for shrinking - it will be just skipped if
1727 * the mutex is locked.
1728 */
1729 mutex_lock(&c->umount_mutex);
1730 if (!(c->vfs_sb->s_flags & MS_RDONLY)) {
1731 /*
1732 * First of all kill the background thread to make sure it does
1733 * not interfere with un-mounting and freeing resources.
1734 */
1735 if (c->bgt) {
1736 kthread_stop(c->bgt);
1737 c->bgt = NULL;
1738 }
1739
1740 /* Synchronize write-buffers */
1741 if (c->jheads)
1742 for (i = 0; i < c->jhead_cnt; i++) {
1743 ubifs_wbuf_sync(&c->jheads[i].wbuf);
1744 del_timer_sync(&c->jheads[i].wbuf.timer);
1745 }
1746
1747 /*
1748 * On fatal errors c->ro_media is set to 1, in which case we do
1749 * not write the master node.
1750 */
1751 if (!c->ro_media) {
1752 /*
1753 * We are being cleanly unmounted which means the
1754 * orphans were killed - indicate this in the master
1755 * node. Also save the reserved GC LEB number.
1756 */
1757 int err;
1758
1759 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
1760 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
1761 c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum);
1762 err = ubifs_write_master(c);
1763 if (err)
1764 /*
1765 * Recovery will attempt to fix the master area
1766 * next mount, so we just print a message and
1767 * continue to unmount normally.
1768 */
1769 ubifs_err("failed to write master node, "
1770 "error %d", err);
1771 }
1772 }
1773
1774 ubifs_umount(c);
1775 bdi_destroy(&c->bdi);
1776 ubi_close_volume(c->ubi);
1777 mutex_unlock(&c->umount_mutex);
1778 kfree(c);
1779}
1780
1781static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
1782{
1783 int err;
1784 struct ubifs_info *c = sb->s_fs_info;
1785
1786 dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags);
1787
1788 err = ubifs_parse_options(c, data, 1);
1789 if (err) {
1790 ubifs_err("invalid or unknown remount parameter");
1791 return err;
1792 }
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001793
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001794 if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02001795 if (c->ro_media) {
1796 ubifs_msg("cannot re-mount R/W, UBIFS is working in "
1797 "R/O mode");
1798 return -EINVAL;
1799 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001800 err = ubifs_remount_rw(c);
1801 if (err)
1802 return err;
1803 } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
1804 ubifs_remount_ro(c);
1805
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001806 if (c->bulk_read == 1)
1807 bu_init(c);
1808 else {
1809 dbg_gen("disable bulk-read");
1810 kfree(c->bu.buf);
1811 c->bu.buf = NULL;
1812 }
1813
Artem Bityutskiyb4978e92009-01-23 18:23:03 +02001814 ubifs_assert(c->lst.taken_empty_lebs == 1);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001815 return 0;
1816}
1817
Artem Bityutskiye8b81562009-01-15 17:43:23 +02001818const struct super_operations ubifs_super_operations = {
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001819 .alloc_inode = ubifs_alloc_inode,
1820 .destroy_inode = ubifs_destroy_inode,
1821 .put_super = ubifs_put_super,
1822 .write_inode = ubifs_write_inode,
1823 .delete_inode = ubifs_delete_inode,
1824 .statfs = ubifs_statfs,
1825 .dirty_inode = ubifs_dirty_inode,
1826 .remount_fs = ubifs_remount_fs,
1827 .show_options = ubifs_show_options,
1828 .sync_fs = ubifs_sync_fs,
1829};
1830
1831/**
1832 * open_ubi - parse UBI device name string and open the UBI device.
1833 * @name: UBI volume name
1834 * @mode: UBI volume open mode
1835 *
1836 * There are several ways to specify UBI volumes when mounting UBIFS:
1837 * o ubiX_Y - UBI device number X, volume Y;
1838 * o ubiY - UBI device number 0, volume Y;
1839 * o ubiX:NAME - mount UBI device X, volume with name NAME;
1840 * o ubi:NAME - mount UBI device 0, volume with name NAME.
1841 *
1842 * Alternative '!' separator may be used instead of ':' (because some shells
1843 * like busybox may interpret ':' as an NFS host name separator). This function
1844 * returns ubi volume object in case of success and a negative error code in
1845 * case of failure.
1846 */
1847static struct ubi_volume_desc *open_ubi(const char *name, int mode)
1848{
1849 int dev, vol;
1850 char *endptr;
1851
1852 if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i')
1853 return ERR_PTR(-EINVAL);
1854
1855 /* ubi:NAME method */
1856 if ((name[3] == ':' || name[3] == '!') && name[4] != '\0')
1857 return ubi_open_volume_nm(0, name + 4, mode);
1858
1859 if (!isdigit(name[3]))
1860 return ERR_PTR(-EINVAL);
1861
1862 dev = simple_strtoul(name + 3, &endptr, 0);
1863
1864 /* ubiY method */
1865 if (*endptr == '\0')
1866 return ubi_open_volume(0, dev, mode);
1867
1868 /* ubiX_Y method */
1869 if (*endptr == '_' && isdigit(endptr[1])) {
1870 vol = simple_strtoul(endptr + 1, &endptr, 0);
1871 if (*endptr != '\0')
1872 return ERR_PTR(-EINVAL);
1873 return ubi_open_volume(dev, vol, mode);
1874 }
1875
1876 /* ubiX:NAME method */
1877 if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0')
1878 return ubi_open_volume_nm(dev, ++endptr, mode);
1879
1880 return ERR_PTR(-EINVAL);
1881}
1882
1883static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
1884{
1885 struct ubi_volume_desc *ubi = sb->s_fs_info;
1886 struct ubifs_info *c;
1887 struct inode *root;
1888 int err;
1889
1890 c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL);
1891 if (!c)
1892 return -ENOMEM;
1893
1894 spin_lock_init(&c->cnt_lock);
1895 spin_lock_init(&c->cs_lock);
1896 spin_lock_init(&c->buds_lock);
1897 spin_lock_init(&c->space_lock);
1898 spin_lock_init(&c->orphan_lock);
1899 init_rwsem(&c->commit_sem);
1900 mutex_init(&c->lp_mutex);
1901 mutex_init(&c->tnc_mutex);
1902 mutex_init(&c->log_mutex);
1903 mutex_init(&c->mst_mutex);
1904 mutex_init(&c->umount_mutex);
Artem Bityutskiy3477d202008-11-19 11:53:15 +02001905 mutex_init(&c->bu_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001906 init_waitqueue_head(&c->cmt_wq);
1907 c->buds = RB_ROOT;
1908 c->old_idx = RB_ROOT;
1909 c->size_tree = RB_ROOT;
1910 c->orph_tree = RB_ROOT;
1911 INIT_LIST_HEAD(&c->infos_list);
1912 INIT_LIST_HEAD(&c->idx_gc);
1913 INIT_LIST_HEAD(&c->replay_list);
1914 INIT_LIST_HEAD(&c->replay_buds);
1915 INIT_LIST_HEAD(&c->uncat_list);
1916 INIT_LIST_HEAD(&c->empty_list);
1917 INIT_LIST_HEAD(&c->freeable_list);
1918 INIT_LIST_HEAD(&c->frdi_idx_list);
1919 INIT_LIST_HEAD(&c->unclean_leb_list);
1920 INIT_LIST_HEAD(&c->old_buds);
1921 INIT_LIST_HEAD(&c->orph_list);
1922 INIT_LIST_HEAD(&c->orph_new);
1923
1924 c->highest_inum = UBIFS_FIRST_INO;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001925 c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
1926
1927 ubi_get_volume_info(ubi, &c->vi);
1928 ubi_get_device_info(c->vi.ubi_num, &c->di);
1929
1930 /* Re-open the UBI device in read-write mode */
1931 c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE);
1932 if (IS_ERR(c->ubi)) {
1933 err = PTR_ERR(c->ubi);
1934 goto out_free;
1935 }
1936
1937 /*
Artem Bityutskiy0a883a02008-08-13 14:13:26 +03001938 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001939 * UBIFS, I/O is not deferred, it is done immediately in readpage,
1940 * which means the user would have to wait not just for their own I/O
Artem Bityutskiy0a883a02008-08-13 14:13:26 +03001941 * but the read-ahead I/O as well i.e. completely pointless.
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001942 *
1943 * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
1944 */
1945 c->bdi.capabilities = BDI_CAP_MAP_COPY;
1946 c->bdi.unplug_io_fn = default_unplug_io_fn;
1947 err = bdi_init(&c->bdi);
1948 if (err)
1949 goto out_close;
1950
1951 err = ubifs_parse_options(c, data, 0);
1952 if (err)
1953 goto out_bdi;
1954
1955 c->vfs_sb = sb;
1956
1957 sb->s_fs_info = c;
1958 sb->s_magic = UBIFS_SUPER_MAGIC;
1959 sb->s_blocksize = UBIFS_BLOCK_SIZE;
1960 sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
1961 sb->s_dev = c->vi.cdev;
1962 sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
1963 if (c->max_inode_sz > MAX_LFS_FILESIZE)
1964 sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
1965 sb->s_op = &ubifs_super_operations;
1966
1967 mutex_lock(&c->umount_mutex);
1968 err = mount_ubifs(c);
1969 if (err) {
1970 ubifs_assert(err < 0);
1971 goto out_unlock;
1972 }
1973
1974 /* Read the root inode */
1975 root = ubifs_iget(sb, UBIFS_ROOT_INO);
1976 if (IS_ERR(root)) {
1977 err = PTR_ERR(root);
1978 goto out_umount;
1979 }
1980
1981 sb->s_root = d_alloc_root(root);
1982 if (!sb->s_root)
1983 goto out_iput;
1984
1985 mutex_unlock(&c->umount_mutex);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001986 return 0;
1987
1988out_iput:
1989 iput(root);
1990out_umount:
1991 ubifs_umount(c);
1992out_unlock:
1993 mutex_unlock(&c->umount_mutex);
1994out_bdi:
1995 bdi_destroy(&c->bdi);
1996out_close:
1997 ubi_close_volume(c->ubi);
1998out_free:
1999 kfree(c);
2000 return err;
2001}
2002
2003static int sb_test(struct super_block *sb, void *data)
2004{
2005 dev_t *dev = data;
2006
2007 return sb->s_dev == *dev;
2008}
2009
2010static int sb_set(struct super_block *sb, void *data)
2011{
2012 dev_t *dev = data;
2013
2014 sb->s_dev = *dev;
2015 return 0;
2016}
2017
2018static int ubifs_get_sb(struct file_system_type *fs_type, int flags,
2019 const char *name, void *data, struct vfsmount *mnt)
2020{
2021 struct ubi_volume_desc *ubi;
2022 struct ubi_volume_info vi;
2023 struct super_block *sb;
2024 int err;
2025
2026 dbg_gen("name %s, flags %#x", name, flags);
2027
2028 /*
2029 * Get UBI device number and volume ID. Mount it read-only so far
2030 * because this might be a new mount point, and UBI allows only one
2031 * read-write user at a time.
2032 */
2033 ubi = open_ubi(name, UBI_READONLY);
2034 if (IS_ERR(ubi)) {
2035 ubifs_err("cannot open \"%s\", error %d",
2036 name, (int)PTR_ERR(ubi));
2037 return PTR_ERR(ubi);
2038 }
2039 ubi_get_volume_info(ubi, &vi);
2040
2041 dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id);
2042
2043 sb = sget(fs_type, &sb_test, &sb_set, &vi.cdev);
2044 if (IS_ERR(sb)) {
2045 err = PTR_ERR(sb);
2046 goto out_close;
2047 }
2048
2049 if (sb->s_root) {
2050 /* A new mount point for already mounted UBIFS */
2051 dbg_gen("this ubi volume is already mounted");
2052 if ((flags ^ sb->s_flags) & MS_RDONLY) {
2053 err = -EBUSY;
2054 goto out_deact;
2055 }
2056 } else {
2057 sb->s_flags = flags;
2058 /*
2059 * Pass 'ubi' to 'fill_super()' in sb->s_fs_info where it is
2060 * replaced by 'c'.
2061 */
2062 sb->s_fs_info = ubi;
2063 err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
2064 if (err)
2065 goto out_deact;
2066 /* We do not support atime */
2067 sb->s_flags |= MS_ACTIVE | MS_NOATIME;
2068 }
2069
2070 /* 'fill_super()' opens ubi again so we must close it here */
2071 ubi_close_volume(ubi);
2072
2073 return simple_set_mnt(mnt, sb);
2074
2075out_deact:
2076 up_write(&sb->s_umount);
2077 deactivate_super(sb);
2078out_close:
2079 ubi_close_volume(ubi);
2080 return err;
2081}
2082
2083static void ubifs_kill_sb(struct super_block *sb)
2084{
2085 struct ubifs_info *c = sb->s_fs_info;
2086
2087 /*
2088 * We do 'commit_on_unmount()' here instead of 'ubifs_put_super()'
2089 * in order to be outside BKL.
2090 */
Artem Bityutskiye4d9b6c2009-01-23 14:17:36 +02002091 if (sb->s_root && !(sb->s_flags & MS_RDONLY))
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002092 commit_on_unmount(c);
2093 /* The un-mount routine is actually done in put_super() */
2094 generic_shutdown_super(sb);
2095}
2096
2097static struct file_system_type ubifs_fs_type = {
2098 .name = "ubifs",
2099 .owner = THIS_MODULE,
2100 .get_sb = ubifs_get_sb,
2101 .kill_sb = ubifs_kill_sb
2102};
2103
2104/*
2105 * Inode slab cache constructor.
2106 */
Alexey Dobriyan51cc5062008-07-25 19:45:34 -07002107static void inode_slab_ctor(void *obj)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002108{
2109 struct ubifs_inode *ui = obj;
2110 inode_init_once(&ui->vfs_inode);
2111}
2112
2113static int __init ubifs_init(void)
2114{
2115 int err;
2116
2117 BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24);
2118
2119 /* Make sure node sizes are 8-byte aligned */
2120 BUILD_BUG_ON(UBIFS_CH_SZ & 7);
2121 BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7);
2122 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7);
2123 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7);
2124 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7);
2125 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7);
2126 BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7);
2127 BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7);
2128 BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7);
2129 BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7);
2130 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7);
2131
2132 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7);
2133 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7);
2134 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7);
2135 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7);
2136 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7);
2137 BUILD_BUG_ON(MIN_WRITE_SZ & 7);
2138
2139 /* Check min. node size */
2140 BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ);
2141 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ);
2142 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ);
2143 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ);
2144
2145 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2146 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ);
2147 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ);
2148 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ);
2149
2150 /* Defined node sizes */
2151 BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096);
2152 BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512);
2153 BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160);
2154 BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64);
2155
2156 /*
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02002157 * We use 2 bit wide bit-fields to store compression type, which should
2158 * be amended if more compressors are added. The bit-fields are:
Artem Bityutskiy553dea42008-11-01 14:57:49 +02002159 * @compr_type in 'struct ubifs_inode', @default_compr in
2160 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
Artem Bityutskiya1dc080c22008-11-01 14:20:50 +02002161 */
2162 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4);
2163
2164 /*
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002165 * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
2166 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2167 */
2168 if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) {
2169 ubifs_err("VFS page cache size is %u bytes, but UBIFS requires"
2170 " at least 4096 bytes",
2171 (unsigned int)PAGE_CACHE_SIZE);
2172 return -EINVAL;
2173 }
2174
2175 err = register_filesystem(&ubifs_fs_type);
2176 if (err) {
2177 ubifs_err("cannot register file system, error %d", err);
2178 return err;
2179 }
2180
2181 err = -ENOMEM;
2182 ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab",
2183 sizeof(struct ubifs_inode), 0,
2184 SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT,
2185 &inode_slab_ctor);
2186 if (!ubifs_inode_slab)
2187 goto out_reg;
2188
2189 register_shrinker(&ubifs_shrinker_info);
2190
2191 err = ubifs_compressors_init();
2192 if (err)
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002193 goto out_shrinker;
2194
2195 err = dbg_debugfs_init();
2196 if (err)
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002197 goto out_compr;
2198
2199 return 0;
2200
2201out_compr:
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002202 ubifs_compressors_exit();
2203out_shrinker:
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002204 unregister_shrinker(&ubifs_shrinker_info);
2205 kmem_cache_destroy(ubifs_inode_slab);
2206out_reg:
2207 unregister_filesystem(&ubifs_fs_type);
2208 return err;
2209}
2210/* late_initcall to let compressors initialize first */
2211late_initcall(ubifs_init);
2212
2213static void __exit ubifs_exit(void)
2214{
2215 ubifs_assert(list_empty(&ubifs_infos));
2216 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0);
2217
Artem Bityutskiy552ff312008-10-23 11:49:28 +03002218 dbg_debugfs_exit();
Artem Bityutskiy1e517642008-07-14 19:08:37 +03002219 ubifs_compressors_exit();
2220 unregister_shrinker(&ubifs_shrinker_info);
2221 kmem_cache_destroy(ubifs_inode_slab);
2222 unregister_filesystem(&ubifs_fs_type);
2223}
2224module_exit(ubifs_exit);
2225
2226MODULE_LICENSE("GPL");
2227MODULE_VERSION(__stringify(UBIFS_VERSION));
2228MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2229MODULE_DESCRIPTION("UBIFS - UBI File System");