Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1 | /* |
| 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 Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 33 | #include <linux/kthread.h> |
| 34 | #include <linux/parser.h> |
| 35 | #include <linux/seq_file.h> |
| 36 | #include <linux/mount.h> |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 37 | #include <linux/math64.h> |
Artem Bityutskiy | 304d427 | 2008-12-28 08:04:17 +0200 | [diff] [blame] | 38 | #include <linux/writeback.h> |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 39 | #include "ubifs.h" |
| 40 | |
Artem Bityutskiy | 39ce81c | 2008-11-18 18:09:49 +0200 | [diff] [blame] | 41 | /* |
| 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 Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 47 | /* Slab cache for UBIFS inodes */ |
| 48 | struct kmem_cache *ubifs_inode_slab; |
| 49 | |
| 50 | /* UBIFS TNC shrinker description */ |
| 51 | static 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 | */ |
| 66 | static 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 | |
| 101 | struct 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 Bityutskiy | 0a883a0 | 2008-08-13 14:13:26 +0300 | [diff] [blame] | 159 | /* Disable read-ahead */ |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 160 | 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 | |
| 247 | out_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; |
| 252 | out_ino: |
| 253 | kfree(ino); |
| 254 | out: |
| 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 | |
| 260 | static 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 | |
| 275 | static 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 | */ |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 286 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 287 | { |
Artem Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 288 | int err = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 289 | 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 Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 309 | /* |
| 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 Bityutskiy | 1f28681 | 2008-07-22 12:06:13 +0300 | [diff] [blame] | 316 | err = ubifs_jnl_write_inode(c, inode); |
Artem Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 317 | if (err) |
| 318 | ubifs_err("can't write inode %lu, error %d", |
| 319 | inode->i_ino, err); |
Artem Bityutskiy | e3c3efc | 2009-08-27 16:34:19 +0300 | [diff] [blame] | 320 | else |
| 321 | err = dbg_check_inode_size(c, inode, ui->ui_size); |
Artem Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 322 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 323 | |
| 324 | ui->dirty = 0; |
| 325 | mutex_unlock(&ui->ui_mutex); |
| 326 | ubifs_release_dirty_inode_budget(c, ui); |
| 327 | return err; |
| 328 | } |
| 329 | |
| 330 | static void ubifs_delete_inode(struct inode *inode) |
| 331 | { |
| 332 | int err; |
| 333 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 334 | struct ubifs_inode *ui = ubifs_inode(inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 335 | |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 336 | if (ui->xattr) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 337 | /* |
| 338 | * Extended attribute inode deletions are fully handled in |
| 339 | * 'ubifs_removexattr()'. These inodes are special and have |
| 340 | * limited usage, so there is nothing to do here. |
| 341 | */ |
| 342 | goto out; |
| 343 | |
Artem Bityutskiy | 7d32c2b | 2008-07-18 18:54:29 +0300 | [diff] [blame] | 344 | dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 345 | ubifs_assert(!atomic_read(&inode->i_count)); |
| 346 | ubifs_assert(inode->i_nlink == 0); |
| 347 | |
| 348 | truncate_inode_pages(&inode->i_data, 0); |
| 349 | if (is_bad_inode(inode)) |
| 350 | goto out; |
| 351 | |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 352 | ui->ui_size = inode->i_size = 0; |
Artem Bityutskiy | de94eb5 | 2008-07-22 13:06:20 +0300 | [diff] [blame] | 353 | err = ubifs_jnl_delete_inode(c, inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 354 | if (err) |
| 355 | /* |
| 356 | * Worst case we have a lost orphan inode wasting space, so a |
Artem Bityutskiy | 0a883a0 | 2008-08-13 14:13:26 +0300 | [diff] [blame] | 357 | * simple error message is OK here. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 358 | */ |
Artem Bityutskiy | de94eb5 | 2008-07-22 13:06:20 +0300 | [diff] [blame] | 359 | ubifs_err("can't delete inode %lu, error %d", |
| 360 | inode->i_ino, err); |
| 361 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 362 | out: |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 363 | if (ui->dirty) |
| 364 | ubifs_release_dirty_inode_budget(c, ui); |
Adrian Hunter | 6d6cb0d | 2009-04-08 14:07:57 +0200 | [diff] [blame] | 365 | else { |
| 366 | /* We've deleted something - clean the "no space" flags */ |
| 367 | c->nospace = c->nospace_rp = 0; |
| 368 | smp_wmb(); |
| 369 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 370 | clear_inode(inode); |
| 371 | } |
| 372 | |
| 373 | static void ubifs_dirty_inode(struct inode *inode) |
| 374 | { |
| 375 | struct ubifs_inode *ui = ubifs_inode(inode); |
| 376 | |
| 377 | ubifs_assert(mutex_is_locked(&ui->ui_mutex)); |
| 378 | if (!ui->dirty) { |
| 379 | ui->dirty = 1; |
| 380 | dbg_gen("inode %lu", inode->i_ino); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 385 | { |
| 386 | struct ubifs_info *c = dentry->d_sb->s_fs_info; |
| 387 | unsigned long long free; |
Artem Bityutskiy | 7c7cbad | 2008-09-03 14:16:42 +0300 | [diff] [blame] | 388 | __le32 *uuid = (__le32 *)c->uuid; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 389 | |
Artem Bityutskiy | 7dad181 | 2008-08-25 18:58:19 +0300 | [diff] [blame] | 390 | free = ubifs_get_free_space(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 391 | dbg_gen("free space %lld bytes (%lld blocks)", |
| 392 | free, free >> UBIFS_BLOCK_SHIFT); |
| 393 | |
| 394 | buf->f_type = UBIFS_SUPER_MAGIC; |
| 395 | buf->f_bsize = UBIFS_BLOCK_SIZE; |
| 396 | buf->f_blocks = c->block_cnt; |
| 397 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; |
| 398 | if (free > c->report_rp_size) |
| 399 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; |
| 400 | else |
| 401 | buf->f_bavail = 0; |
| 402 | buf->f_files = 0; |
| 403 | buf->f_ffree = 0; |
| 404 | buf->f_namelen = UBIFS_MAX_NLEN; |
Artem Bityutskiy | 7c7cbad | 2008-09-03 14:16:42 +0300 | [diff] [blame] | 405 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
| 406 | buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 407 | ubifs_assert(buf->f_bfree <= c->block_cnt); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt) |
| 412 | { |
| 413 | struct ubifs_info *c = mnt->mnt_sb->s_fs_info; |
| 414 | |
| 415 | if (c->mount_opts.unmount_mode == 2) |
| 416 | seq_printf(s, ",fast_unmount"); |
| 417 | else if (c->mount_opts.unmount_mode == 1) |
| 418 | seq_printf(s, ",norm_unmount"); |
| 419 | |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 420 | if (c->mount_opts.bulk_read == 2) |
| 421 | seq_printf(s, ",bulk_read"); |
| 422 | else if (c->mount_opts.bulk_read == 1) |
| 423 | seq_printf(s, ",no_bulk_read"); |
| 424 | |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 425 | if (c->mount_opts.chk_data_crc == 2) |
| 426 | seq_printf(s, ",chk_data_crc"); |
| 427 | else if (c->mount_opts.chk_data_crc == 1) |
| 428 | seq_printf(s, ",no_chk_data_crc"); |
| 429 | |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 430 | if (c->mount_opts.override_compr) { |
Hunter Adrian | fcabb34 | 2009-03-18 12:29:39 +0100 | [diff] [blame] | 431 | seq_printf(s, ",compr=%s", |
| 432 | ubifs_compr_name(c->mount_opts.compr_type)); |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 433 | } |
| 434 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | static int ubifs_sync_fs(struct super_block *sb, int wait) |
| 439 | { |
Artem Bityutskiy | f103830 | 2008-12-28 08:16:32 +0200 | [diff] [blame] | 440 | int i, err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 441 | struct ubifs_info *c = sb->s_fs_info; |
Artem Bityutskiy | 304d427 | 2008-12-28 08:04:17 +0200 | [diff] [blame] | 442 | |
Artem Bityutskiy | e8ea175 | 2009-01-06 14:40:23 -0800 | [diff] [blame] | 443 | /* |
Artem Bityutskiy | dedb0d4 | 2009-01-09 21:02:37 +0200 | [diff] [blame] | 444 | * Zero @wait is just an advisory thing to help the file system shove |
| 445 | * lots of data into the queues, and there will be the second |
Artem Bityutskiy | e8ea175 | 2009-01-06 14:40:23 -0800 | [diff] [blame] | 446 | * '->sync_fs()' call, with non-zero @wait. |
| 447 | */ |
Artem Bityutskiy | dedb0d4 | 2009-01-09 21:02:37 +0200 | [diff] [blame] | 448 | if (!wait) |
| 449 | return 0; |
Artem Bityutskiy | e8ea175 | 2009-01-06 14:40:23 -0800 | [diff] [blame] | 450 | |
Artem Bityutskiy | f103830 | 2008-12-28 08:16:32 +0200 | [diff] [blame] | 451 | /* |
Adrian Hunter | 3eb1429 | 2009-01-29 11:17:24 +0200 | [diff] [blame] | 452 | * Synchronize write buffers, because 'ubifs_run_commit()' does not |
| 453 | * do this if it waits for an already running commit. |
| 454 | */ |
| 455 | for (i = 0; i < c->jhead_cnt; i++) { |
| 456 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); |
| 457 | if (err) |
| 458 | return err; |
| 459 | } |
| 460 | |
Artem Bityutskiy | 887ee17 | 2009-07-20 17:56:19 +0300 | [diff] [blame] | 461 | /* |
| 462 | * Strictly speaking, it is not necessary to commit the journal here, |
| 463 | * synchronizing write-buffers would be enough. But committing makes |
| 464 | * UBIFS free space predictions much more accurate, so we want to let |
| 465 | * the user be able to get more accurate results of 'statfs()' after |
| 466 | * they synchronize the file system. |
| 467 | */ |
Artem Bityutskiy | f103830 | 2008-12-28 08:16:32 +0200 | [diff] [blame] | 468 | err = ubifs_run_commit(c); |
| 469 | if (err) |
| 470 | return err; |
Artem Bityutskiy | 403e12a | 2008-09-09 12:31:37 +0300 | [diff] [blame] | 471 | |
Artem Bityutskiy | cb5c6a2 | 2008-12-28 08:18:43 +0200 | [diff] [blame] | 472 | return ubi_sync(c->vi.ubi_num); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | /** |
| 476 | * init_constants_early - initialize UBIFS constants. |
| 477 | * @c: UBIFS file-system description object |
| 478 | * |
| 479 | * This function initialize UBIFS constants which do not need the superblock to |
| 480 | * be read. It also checks that the UBI volume satisfies basic UBIFS |
| 481 | * requirements. Returns zero in case of success and a negative error code in |
| 482 | * case of failure. |
| 483 | */ |
| 484 | static int init_constants_early(struct ubifs_info *c) |
| 485 | { |
| 486 | if (c->vi.corrupted) { |
| 487 | ubifs_warn("UBI volume is corrupted - read-only mode"); |
| 488 | c->ro_media = 1; |
| 489 | } |
| 490 | |
| 491 | if (c->di.ro_mode) { |
| 492 | ubifs_msg("read-only UBI device"); |
| 493 | c->ro_media = 1; |
| 494 | } |
| 495 | |
| 496 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { |
| 497 | ubifs_msg("static UBI volume - read-only mode"); |
| 498 | c->ro_media = 1; |
| 499 | } |
| 500 | |
| 501 | c->leb_cnt = c->vi.size; |
| 502 | c->leb_size = c->vi.usable_leb_size; |
| 503 | c->half_leb_size = c->leb_size / 2; |
| 504 | c->min_io_size = c->di.min_io_size; |
| 505 | c->min_io_shift = fls(c->min_io_size) - 1; |
| 506 | |
| 507 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { |
| 508 | ubifs_err("too small LEBs (%d bytes), min. is %d bytes", |
| 509 | c->leb_size, UBIFS_MIN_LEB_SZ); |
| 510 | return -EINVAL; |
| 511 | } |
| 512 | |
| 513 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { |
| 514 | ubifs_err("too few LEBs (%d), min. is %d", |
| 515 | c->leb_cnt, UBIFS_MIN_LEB_CNT); |
| 516 | return -EINVAL; |
| 517 | } |
| 518 | |
| 519 | if (!is_power_of_2(c->min_io_size)) { |
| 520 | ubifs_err("bad min. I/O size %d", c->min_io_size); |
| 521 | return -EINVAL; |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * UBIFS aligns all node to 8-byte boundary, so to make function in |
| 526 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is |
| 527 | * less than 8. |
| 528 | */ |
| 529 | if (c->min_io_size < 8) { |
| 530 | c->min_io_size = 8; |
| 531 | c->min_io_shift = 3; |
| 532 | } |
| 533 | |
| 534 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); |
| 535 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); |
| 536 | |
| 537 | /* |
| 538 | * Initialize node length ranges which are mostly needed for node |
| 539 | * length validation. |
| 540 | */ |
| 541 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; |
| 542 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; |
| 543 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; |
| 544 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; |
| 545 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; |
| 546 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; |
| 547 | |
| 548 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; |
| 549 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; |
| 550 | c->ranges[UBIFS_ORPH_NODE].min_len = |
| 551 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); |
| 552 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; |
| 553 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; |
| 554 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; |
| 555 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; |
| 556 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; |
| 557 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; |
| 558 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; |
| 559 | /* |
| 560 | * Minimum indexing node size is amended later when superblock is |
| 561 | * read and the key length is known. |
| 562 | */ |
| 563 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; |
| 564 | /* |
| 565 | * Maximum indexing node size is amended later when superblock is |
| 566 | * read and the fanout is known. |
| 567 | */ |
| 568 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; |
| 569 | |
| 570 | /* |
Artem Bityutskiy | 7078202 | 2009-01-19 19:57:27 +0200 | [diff] [blame] | 571 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
| 572 | * about these values. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 573 | */ |
| 574 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); |
| 575 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); |
| 576 | |
Artem Bityutskiy | 9bbb572 | 2008-08-22 18:23:22 +0300 | [diff] [blame] | 577 | /* |
| 578 | * Calculate how many bytes would be wasted at the end of LEB if it was |
| 579 | * fully filled with data nodes of maximum size. This is used in |
| 580 | * calculations when reporting free space. |
| 581 | */ |
| 582 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; |
Artem Bityutskiy | 39ce81c | 2008-11-18 18:09:49 +0200 | [diff] [blame] | 583 | |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 584 | /* Buffer size for bulk-reads */ |
Artem Bityutskiy | 6c0c42c | 2008-11-18 20:20:05 +0200 | [diff] [blame] | 585 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
| 586 | if (c->max_bu_buf_len > c->leb_size) |
| 587 | c->max_bu_buf_len = c->leb_size; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | /** |
| 592 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. |
| 593 | * @c: UBIFS file-system description object |
| 594 | * @lnum: LEB the write-buffer was synchronized to |
| 595 | * @free: how many free bytes left in this LEB |
| 596 | * @pad: how many bytes were padded |
| 597 | * |
| 598 | * This is a callback function which is called by the I/O unit when the |
| 599 | * write-buffer is synchronized. We need this to correctly maintain space |
| 600 | * accounting in bud logical eraseblocks. This function returns zero in case of |
| 601 | * success and a negative error code in case of failure. |
| 602 | * |
| 603 | * This function actually belongs to the journal, but we keep it here because |
| 604 | * we want to keep it static. |
| 605 | */ |
| 606 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) |
| 607 | { |
| 608 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); |
| 609 | } |
| 610 | |
| 611 | /* |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 612 | * init_constants_sb - initialize UBIFS constants. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 613 | * @c: UBIFS file-system description object |
| 614 | * |
| 615 | * This is a helper function which initializes various UBIFS constants after |
| 616 | * the superblock has been read. It also checks various UBIFS parameters and |
| 617 | * makes sure they are all right. Returns zero in case of success and a |
| 618 | * negative error code in case of failure. |
| 619 | */ |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 620 | static int init_constants_sb(struct ubifs_info *c) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 621 | { |
| 622 | int tmp, err; |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 623 | long long tmp64; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 624 | |
| 625 | c->main_bytes = (long long)c->main_lebs * c->leb_size; |
| 626 | c->max_znode_sz = sizeof(struct ubifs_znode) + |
| 627 | c->fanout * sizeof(struct ubifs_zbranch); |
| 628 | |
| 629 | tmp = ubifs_idx_node_sz(c, 1); |
| 630 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; |
| 631 | c->min_idx_node_sz = ALIGN(tmp, 8); |
| 632 | |
| 633 | tmp = ubifs_idx_node_sz(c, c->fanout); |
| 634 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; |
| 635 | c->max_idx_node_sz = ALIGN(tmp, 8); |
| 636 | |
| 637 | /* Make sure LEB size is large enough to fit full commit */ |
| 638 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; |
| 639 | tmp = ALIGN(tmp, c->min_io_size); |
| 640 | if (tmp > c->leb_size) { |
| 641 | dbg_err("too small LEB size %d, at least %d needed", |
| 642 | c->leb_size, tmp); |
| 643 | return -EINVAL; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * Make sure that the log is large enough to fit reference nodes for |
| 648 | * all buds plus one reserved LEB. |
| 649 | */ |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 650 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
| 651 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 652 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
| 653 | tmp /= c->leb_size; |
| 654 | tmp += 1; |
| 655 | if (c->log_lebs < tmp) { |
| 656 | dbg_err("too small log %d LEBs, required min. %d LEBs", |
| 657 | c->log_lebs, tmp); |
| 658 | return -EINVAL; |
| 659 | } |
| 660 | |
| 661 | /* |
| 662 | * When budgeting we assume worst-case scenarios when the pages are not |
| 663 | * be compressed and direntries are of the maximum size. |
| 664 | * |
| 665 | * Note, data, which may be stored in inodes is budgeted separately, so |
| 666 | * it is not included into 'c->inode_budget'. |
| 667 | */ |
| 668 | c->page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; |
| 669 | c->inode_budget = UBIFS_INO_NODE_SZ; |
| 670 | c->dent_budget = UBIFS_MAX_DENT_NODE_SZ; |
| 671 | |
| 672 | /* |
| 673 | * When the amount of flash space used by buds becomes |
| 674 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. |
| 675 | * The writers are unblocked when the commit is finished. To avoid |
| 676 | * writers to be blocked UBIFS initiates background commit in advance, |
| 677 | * when number of bud bytes becomes above the limit defined below. |
| 678 | */ |
| 679 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; |
| 680 | |
| 681 | /* |
| 682 | * Ensure minimum journal size. All the bytes in the journal heads are |
| 683 | * considered to be used, when calculating the current journal usage. |
| 684 | * Consequently, if the journal is too small, UBIFS will treat it as |
| 685 | * always full. |
| 686 | */ |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 687 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 688 | if (c->bg_bud_bytes < tmp64) |
| 689 | c->bg_bud_bytes = tmp64; |
| 690 | if (c->max_bud_bytes < tmp64 + c->leb_size) |
| 691 | c->max_bud_bytes = tmp64 + c->leb_size; |
| 692 | |
| 693 | err = ubifs_calc_lpt_geom(c); |
| 694 | if (err) |
| 695 | return err; |
| 696 | |
Artem Bityutskiy | fb1cd01 | 2009-03-16 09:56:57 +0200 | [diff] [blame] | 697 | /* Initialize effective LEB size used in budgeting calculations */ |
| 698 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * init_constants_master - initialize UBIFS constants. |
| 704 | * @c: UBIFS file-system description object |
| 705 | * |
| 706 | * This is a helper function which initializes various UBIFS constants after |
| 707 | * the master node has been read. It also checks various UBIFS parameters and |
| 708 | * makes sure they are all right. |
| 709 | */ |
| 710 | static void init_constants_master(struct ubifs_info *c) |
| 711 | { |
| 712 | long long tmp64; |
| 713 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 714 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
Artem Bityutskiy | fb1cd01 | 2009-03-16 09:56:57 +0200 | [diff] [blame] | 715 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 716 | |
| 717 | /* |
| 718 | * Calculate total amount of FS blocks. This number is not used |
| 719 | * internally because it does not make much sense for UBIFS, but it is |
| 720 | * necessary to report something for the 'statfs()' call. |
| 721 | * |
Artem Bityutskiy | 7dad181 | 2008-08-25 18:58:19 +0300 | [diff] [blame] | 722 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
Artem Bityutskiy | af14a1a | 2008-12-19 19:26:29 +0200 | [diff] [blame] | 723 | * deletions, minimum LEBs for the index, and assume only one journal |
| 724 | * head is available. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 725 | */ |
Artem Bityutskiy | af14a1a | 2008-12-19 19:26:29 +0200 | [diff] [blame] | 726 | tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1; |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 727 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 728 | tmp64 = ubifs_reported_space(c, tmp64); |
| 729 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /** |
| 733 | * take_gc_lnum - reserve GC LEB. |
| 734 | * @c: UBIFS file-system description object |
| 735 | * |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 736 | * This function ensures that the LEB reserved for garbage collection is marked |
| 737 | * as "taken" in lprops. We also have to set free space to LEB size and dirty |
| 738 | * space to zero, because lprops may contain out-of-date information if the |
| 739 | * file-system was un-mounted before it has been committed. This function |
| 740 | * returns zero in case of success and a negative error code in case of |
| 741 | * failure. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 742 | */ |
| 743 | static int take_gc_lnum(struct ubifs_info *c) |
| 744 | { |
| 745 | int err; |
| 746 | |
| 747 | if (c->gc_lnum == -1) { |
| 748 | ubifs_err("no LEB for GC"); |
| 749 | return -EINVAL; |
| 750 | } |
| 751 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 752 | /* And we have to tell lprops that this LEB is taken */ |
| 753 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, |
| 754 | LPROPS_TAKEN, 0, 0); |
| 755 | return err; |
| 756 | } |
| 757 | |
| 758 | /** |
| 759 | * alloc_wbufs - allocate write-buffers. |
| 760 | * @c: UBIFS file-system description object |
| 761 | * |
| 762 | * This helper function allocates and initializes UBIFS write-buffers. Returns |
| 763 | * zero in case of success and %-ENOMEM in case of failure. |
| 764 | */ |
| 765 | static int alloc_wbufs(struct ubifs_info *c) |
| 766 | { |
| 767 | int i, err; |
| 768 | |
| 769 | c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead), |
| 770 | GFP_KERNEL); |
| 771 | if (!c->jheads) |
| 772 | return -ENOMEM; |
| 773 | |
| 774 | /* Initialize journal heads */ |
| 775 | for (i = 0; i < c->jhead_cnt; i++) { |
| 776 | INIT_LIST_HEAD(&c->jheads[i].buds_list); |
| 777 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); |
| 778 | if (err) |
| 779 | return err; |
| 780 | |
| 781 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; |
| 782 | c->jheads[i].wbuf.jhead = i; |
| 783 | } |
| 784 | |
| 785 | c->jheads[BASEHD].wbuf.dtype = UBI_SHORTTERM; |
| 786 | /* |
| 787 | * Garbage Collector head likely contains long-term data and |
| 788 | * does not need to be synchronized by timer. |
| 789 | */ |
| 790 | c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM; |
Artem Bityutskiy | 0b335b9 | 2009-06-23 12:30:43 +0300 | [diff] [blame] | 791 | c->jheads[GCHD].wbuf.no_timer = 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 792 | |
| 793 | return 0; |
| 794 | } |
| 795 | |
| 796 | /** |
| 797 | * free_wbufs - free write-buffers. |
| 798 | * @c: UBIFS file-system description object |
| 799 | */ |
| 800 | static void free_wbufs(struct ubifs_info *c) |
| 801 | { |
| 802 | int i; |
| 803 | |
| 804 | if (c->jheads) { |
| 805 | for (i = 0; i < c->jhead_cnt; i++) { |
| 806 | kfree(c->jheads[i].wbuf.buf); |
| 807 | kfree(c->jheads[i].wbuf.inodes); |
| 808 | } |
| 809 | kfree(c->jheads); |
| 810 | c->jheads = NULL; |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | /** |
| 815 | * free_orphans - free orphans. |
| 816 | * @c: UBIFS file-system description object |
| 817 | */ |
| 818 | static void free_orphans(struct ubifs_info *c) |
| 819 | { |
| 820 | struct ubifs_orphan *orph; |
| 821 | |
| 822 | while (c->orph_dnext) { |
| 823 | orph = c->orph_dnext; |
| 824 | c->orph_dnext = orph->dnext; |
| 825 | list_del(&orph->list); |
| 826 | kfree(orph); |
| 827 | } |
| 828 | |
| 829 | while (!list_empty(&c->orph_list)) { |
| 830 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); |
| 831 | list_del(&orph->list); |
| 832 | kfree(orph); |
| 833 | dbg_err("orphan list not empty at unmount"); |
| 834 | } |
| 835 | |
| 836 | vfree(c->orph_buf); |
| 837 | c->orph_buf = NULL; |
| 838 | } |
| 839 | |
| 840 | /** |
| 841 | * free_buds - free per-bud objects. |
| 842 | * @c: UBIFS file-system description object |
| 843 | */ |
| 844 | static void free_buds(struct ubifs_info *c) |
| 845 | { |
| 846 | struct rb_node *this = c->buds.rb_node; |
| 847 | struct ubifs_bud *bud; |
| 848 | |
| 849 | while (this) { |
| 850 | if (this->rb_left) |
| 851 | this = this->rb_left; |
| 852 | else if (this->rb_right) |
| 853 | this = this->rb_right; |
| 854 | else { |
| 855 | bud = rb_entry(this, struct ubifs_bud, rb); |
| 856 | this = rb_parent(this); |
| 857 | if (this) { |
| 858 | if (this->rb_left == &bud->rb) |
| 859 | this->rb_left = NULL; |
| 860 | else |
| 861 | this->rb_right = NULL; |
| 862 | } |
| 863 | kfree(bud); |
| 864 | } |
| 865 | } |
| 866 | } |
| 867 | |
| 868 | /** |
| 869 | * check_volume_empty - check if the UBI volume is empty. |
| 870 | * @c: UBIFS file-system description object |
| 871 | * |
| 872 | * This function checks if the UBIFS volume is empty by looking if its LEBs are |
| 873 | * mapped or not. The result of checking is stored in the @c->empty variable. |
| 874 | * Returns zero in case of success and a negative error code in case of |
| 875 | * failure. |
| 876 | */ |
| 877 | static int check_volume_empty(struct ubifs_info *c) |
| 878 | { |
| 879 | int lnum, err; |
| 880 | |
| 881 | c->empty = 1; |
| 882 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { |
| 883 | err = ubi_is_mapped(c->ubi, lnum); |
| 884 | if (unlikely(err < 0)) |
| 885 | return err; |
| 886 | if (err == 1) { |
| 887 | c->empty = 0; |
| 888 | break; |
| 889 | } |
| 890 | |
| 891 | cond_resched(); |
| 892 | } |
| 893 | |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | /* |
| 898 | * UBIFS mount options. |
| 899 | * |
| 900 | * Opt_fast_unmount: do not run a journal commit before un-mounting |
| 901 | * Opt_norm_unmount: run a journal commit before un-mounting |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 902 | * Opt_bulk_read: enable bulk-reads |
| 903 | * Opt_no_bulk_read: disable bulk-reads |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 904 | * Opt_chk_data_crc: check CRCs when reading data nodes |
| 905 | * Opt_no_chk_data_crc: do not check CRCs when reading data nodes |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 906 | * Opt_override_compr: override default compressor |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 907 | * Opt_err: just end of array marker |
| 908 | */ |
| 909 | enum { |
| 910 | Opt_fast_unmount, |
| 911 | Opt_norm_unmount, |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 912 | Opt_bulk_read, |
| 913 | Opt_no_bulk_read, |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 914 | Opt_chk_data_crc, |
| 915 | Opt_no_chk_data_crc, |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 916 | Opt_override_compr, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 917 | Opt_err, |
| 918 | }; |
| 919 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 920 | static const match_table_t tokens = { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 921 | {Opt_fast_unmount, "fast_unmount"}, |
| 922 | {Opt_norm_unmount, "norm_unmount"}, |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 923 | {Opt_bulk_read, "bulk_read"}, |
| 924 | {Opt_no_bulk_read, "no_bulk_read"}, |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 925 | {Opt_chk_data_crc, "chk_data_crc"}, |
| 926 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 927 | {Opt_override_compr, "compr=%s"}, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 928 | {Opt_err, NULL}, |
| 929 | }; |
| 930 | |
| 931 | /** |
Artem Bityutskiy | 8379ea3 | 2009-05-29 12:34:52 +0300 | [diff] [blame] | 932 | * parse_standard_option - parse a standard mount option. |
| 933 | * @option: the option to parse |
| 934 | * |
| 935 | * Normally, standard mount options like "sync" are passed to file-systems as |
| 936 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may |
| 937 | * be present in the options string. This function tries to deal with this |
| 938 | * situation and parse standard options. Returns 0 if the option was not |
| 939 | * recognized, and the corresponding integer flag if it was. |
| 940 | * |
| 941 | * UBIFS is only interested in the "sync" option, so do not check for anything |
| 942 | * else. |
| 943 | */ |
| 944 | static int parse_standard_option(const char *option) |
| 945 | { |
| 946 | ubifs_msg("parse %s", option); |
| 947 | if (!strcmp(option, "sync")) |
| 948 | return MS_SYNCHRONOUS; |
| 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | /** |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 953 | * ubifs_parse_options - parse mount parameters. |
| 954 | * @c: UBIFS file-system description object |
| 955 | * @options: parameters to parse |
| 956 | * @is_remount: non-zero if this is FS re-mount |
| 957 | * |
| 958 | * This function parses UBIFS mount options and returns zero in case success |
| 959 | * and a negative error code in case of failure. |
| 960 | */ |
| 961 | static int ubifs_parse_options(struct ubifs_info *c, char *options, |
| 962 | int is_remount) |
| 963 | { |
| 964 | char *p; |
| 965 | substring_t args[MAX_OPT_ARGS]; |
| 966 | |
| 967 | if (!options) |
| 968 | return 0; |
| 969 | |
| 970 | while ((p = strsep(&options, ","))) { |
| 971 | int token; |
| 972 | |
| 973 | if (!*p) |
| 974 | continue; |
| 975 | |
| 976 | token = match_token(p, tokens, args); |
| 977 | switch (token) { |
Artem Bityutskiy | 27ad279 | 2009-01-29 16:34:30 +0200 | [diff] [blame] | 978 | /* |
| 979 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. |
Artem Bityutskiy | cb54ef8 | 2009-06-23 20:30:32 +0300 | [diff] [blame] | 980 | * We accept them in order to be backward-compatible. But this |
Artem Bityutskiy | 27ad279 | 2009-01-29 16:34:30 +0200 | [diff] [blame] | 981 | * should be removed at some point. |
| 982 | */ |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 983 | case Opt_fast_unmount: |
| 984 | c->mount_opts.unmount_mode = 2; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 985 | break; |
| 986 | case Opt_norm_unmount: |
| 987 | c->mount_opts.unmount_mode = 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 988 | break; |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 989 | case Opt_bulk_read: |
| 990 | c->mount_opts.bulk_read = 2; |
| 991 | c->bulk_read = 1; |
| 992 | break; |
| 993 | case Opt_no_bulk_read: |
| 994 | c->mount_opts.bulk_read = 1; |
| 995 | c->bulk_read = 0; |
| 996 | break; |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 997 | case Opt_chk_data_crc: |
| 998 | c->mount_opts.chk_data_crc = 2; |
| 999 | c->no_chk_data_crc = 0; |
| 1000 | break; |
| 1001 | case Opt_no_chk_data_crc: |
| 1002 | c->mount_opts.chk_data_crc = 1; |
| 1003 | c->no_chk_data_crc = 1; |
| 1004 | break; |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1005 | case Opt_override_compr: |
| 1006 | { |
| 1007 | char *name = match_strdup(&args[0]); |
| 1008 | |
| 1009 | if (!name) |
| 1010 | return -ENOMEM; |
| 1011 | if (!strcmp(name, "none")) |
| 1012 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; |
| 1013 | else if (!strcmp(name, "lzo")) |
| 1014 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; |
| 1015 | else if (!strcmp(name, "zlib")) |
| 1016 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; |
| 1017 | else { |
| 1018 | ubifs_err("unknown compressor \"%s\"", name); |
| 1019 | kfree(name); |
| 1020 | return -EINVAL; |
| 1021 | } |
| 1022 | kfree(name); |
| 1023 | c->mount_opts.override_compr = 1; |
| 1024 | c->default_compr = c->mount_opts.compr_type; |
| 1025 | break; |
| 1026 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1027 | default: |
Artem Bityutskiy | 8379ea3 | 2009-05-29 12:34:52 +0300 | [diff] [blame] | 1028 | { |
| 1029 | unsigned long flag; |
| 1030 | struct super_block *sb = c->vfs_sb; |
| 1031 | |
| 1032 | flag = parse_standard_option(p); |
| 1033 | if (!flag) { |
| 1034 | ubifs_err("unrecognized mount option \"%s\" " |
| 1035 | "or missing value", p); |
| 1036 | return -EINVAL; |
| 1037 | } |
| 1038 | sb->s_flags |= flag; |
| 1039 | break; |
| 1040 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | return 0; |
| 1045 | } |
| 1046 | |
| 1047 | /** |
| 1048 | * destroy_journal - destroy journal data structures. |
| 1049 | * @c: UBIFS file-system description object |
| 1050 | * |
| 1051 | * This function destroys journal data structures including those that may have |
| 1052 | * been created by recovery functions. |
| 1053 | */ |
| 1054 | static void destroy_journal(struct ubifs_info *c) |
| 1055 | { |
| 1056 | while (!list_empty(&c->unclean_leb_list)) { |
| 1057 | struct ubifs_unclean_leb *ucleb; |
| 1058 | |
| 1059 | ucleb = list_entry(c->unclean_leb_list.next, |
| 1060 | struct ubifs_unclean_leb, list); |
| 1061 | list_del(&ucleb->list); |
| 1062 | kfree(ucleb); |
| 1063 | } |
| 1064 | while (!list_empty(&c->old_buds)) { |
| 1065 | struct ubifs_bud *bud; |
| 1066 | |
| 1067 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); |
| 1068 | list_del(&bud->list); |
| 1069 | kfree(bud); |
| 1070 | } |
| 1071 | ubifs_destroy_idx_gc(c); |
| 1072 | ubifs_destroy_size_tree(c); |
| 1073 | ubifs_tnc_close(c); |
| 1074 | free_buds(c); |
| 1075 | } |
| 1076 | |
| 1077 | /** |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1078 | * bu_init - initialize bulk-read information. |
| 1079 | * @c: UBIFS file-system description object |
| 1080 | */ |
| 1081 | static void bu_init(struct ubifs_info *c) |
| 1082 | { |
| 1083 | ubifs_assert(c->bulk_read == 1); |
| 1084 | |
| 1085 | if (c->bu.buf) |
| 1086 | return; /* Already initialized */ |
| 1087 | |
| 1088 | again: |
| 1089 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); |
| 1090 | if (!c->bu.buf) { |
| 1091 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { |
| 1092 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; |
| 1093 | goto again; |
| 1094 | } |
| 1095 | |
| 1096 | /* Just disable bulk-read */ |
| 1097 | ubifs_warn("Cannot allocate %d bytes of memory for bulk-read, " |
| 1098 | "disabling it", c->max_bu_buf_len); |
| 1099 | c->mount_opts.bulk_read = 1; |
| 1100 | c->bulk_read = 0; |
| 1101 | return; |
| 1102 | } |
| 1103 | } |
| 1104 | |
| 1105 | /** |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1106 | * check_free_space - check if there is enough free space to mount. |
| 1107 | * @c: UBIFS file-system description object |
| 1108 | * |
| 1109 | * This function makes sure UBIFS has enough free space to be mounted in |
| 1110 | * read/write mode. UBIFS must always have some free space to allow deletions. |
| 1111 | */ |
| 1112 | static int check_free_space(struct ubifs_info *c) |
| 1113 | { |
| 1114 | ubifs_assert(c->dark_wm > 0); |
| 1115 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { |
| 1116 | ubifs_err("insufficient free space to mount in read/write mode"); |
| 1117 | dbg_dump_budg(c); |
| 1118 | dbg_dump_lprops(c); |
Artem Bityutskiy | a2b9df3 | 2009-01-29 16:22:54 +0200 | [diff] [blame] | 1119 | return -ENOSPC; |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1120 | } |
| 1121 | return 0; |
| 1122 | } |
| 1123 | |
| 1124 | /** |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1125 | * mount_ubifs - mount UBIFS file-system. |
| 1126 | * @c: UBIFS file-system description object |
| 1127 | * |
| 1128 | * This function mounts UBIFS file system. Returns zero in case of success and |
| 1129 | * a negative error code in case of failure. |
| 1130 | * |
| 1131 | * Note, the function does not de-allocate resources it it fails half way |
| 1132 | * through, and the caller has to do this instead. |
| 1133 | */ |
| 1134 | static int mount_ubifs(struct ubifs_info *c) |
| 1135 | { |
| 1136 | struct super_block *sb = c->vfs_sb; |
| 1137 | int err, mounted_read_only = (sb->s_flags & MS_RDONLY); |
| 1138 | long long x; |
| 1139 | size_t sz; |
| 1140 | |
| 1141 | err = init_constants_early(c); |
| 1142 | if (err) |
| 1143 | return err; |
| 1144 | |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1145 | err = ubifs_debugging_init(c); |
| 1146 | if (err) |
| 1147 | return err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1148 | |
| 1149 | err = check_volume_empty(c); |
| 1150 | if (err) |
| 1151 | goto out_free; |
| 1152 | |
| 1153 | if (c->empty && (mounted_read_only || c->ro_media)) { |
| 1154 | /* |
| 1155 | * This UBI volume is empty, and read-only, or the file system |
| 1156 | * is mounted read-only - we cannot format it. |
| 1157 | */ |
| 1158 | ubifs_err("can't format empty UBI volume: read-only %s", |
| 1159 | c->ro_media ? "UBI volume" : "mount"); |
| 1160 | err = -EROFS; |
| 1161 | goto out_free; |
| 1162 | } |
| 1163 | |
| 1164 | if (c->ro_media && !mounted_read_only) { |
| 1165 | ubifs_err("cannot mount read-write - read-only media"); |
| 1166 | err = -EROFS; |
| 1167 | goto out_free; |
| 1168 | } |
| 1169 | |
| 1170 | /* |
| 1171 | * The requirement for the buffer is that it should fit indexing B-tree |
| 1172 | * height amount of integers. We assume the height if the TNC tree will |
| 1173 | * never exceed 64. |
| 1174 | */ |
| 1175 | err = -ENOMEM; |
| 1176 | c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL); |
| 1177 | if (!c->bottom_up_buf) |
| 1178 | goto out_free; |
| 1179 | |
| 1180 | c->sbuf = vmalloc(c->leb_size); |
| 1181 | if (!c->sbuf) |
| 1182 | goto out_free; |
| 1183 | |
| 1184 | if (!mounted_read_only) { |
| 1185 | c->ileb_buf = vmalloc(c->leb_size); |
| 1186 | if (!c->ileb_buf) |
| 1187 | goto out_free; |
| 1188 | } |
| 1189 | |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1190 | if (c->bulk_read == 1) |
| 1191 | bu_init(c); |
| 1192 | |
| 1193 | /* |
| 1194 | * We have to check all CRCs, even for data nodes, when we mount the FS |
| 1195 | * (specifically, when we are replaying). |
| 1196 | */ |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1197 | c->always_chk_crc = 1; |
| 1198 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1199 | err = ubifs_read_superblock(c); |
| 1200 | if (err) |
| 1201 | goto out_free; |
| 1202 | |
| 1203 | /* |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1204 | * Make sure the compressor which is set as default in the superblock |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1205 | * or overridden by mount options is actually compiled in. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1206 | */ |
| 1207 | if (!ubifs_compr_present(c->default_compr)) { |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1208 | ubifs_err("'compressor \"%s\" is not compiled in", |
| 1209 | ubifs_compr_name(c->default_compr)); |
Corentin Chary | 8eec2f3 | 2009-05-25 08:49:10 +0200 | [diff] [blame] | 1210 | err = -ENOTSUPP; |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1211 | goto out_free; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1212 | } |
| 1213 | |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 1214 | err = init_constants_sb(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1215 | if (err) |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1216 | goto out_free; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1217 | |
| 1218 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size); |
| 1219 | sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); |
| 1220 | c->cbuf = kmalloc(sz, GFP_NOFS); |
| 1221 | if (!c->cbuf) { |
| 1222 | err = -ENOMEM; |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1223 | goto out_free; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1224 | } |
| 1225 | |
Sebastian Siewior | 0855f31 | 2008-09-09 11:17:29 +0200 | [diff] [blame] | 1226 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1227 | if (!mounted_read_only) { |
| 1228 | err = alloc_wbufs(c); |
| 1229 | if (err) |
| 1230 | goto out_cbuf; |
| 1231 | |
| 1232 | /* Create background thread */ |
Hunter Adrian | fcabb34 | 2009-03-18 12:29:39 +0100 | [diff] [blame] | 1233 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1234 | if (IS_ERR(c->bgt)) { |
| 1235 | err = PTR_ERR(c->bgt); |
| 1236 | c->bgt = NULL; |
| 1237 | ubifs_err("cannot spawn \"%s\", error %d", |
| 1238 | c->bgt_name, err); |
| 1239 | goto out_wbufs; |
| 1240 | } |
| 1241 | wake_up_process(c->bgt); |
| 1242 | } |
| 1243 | |
| 1244 | err = ubifs_read_master(c); |
| 1245 | if (err) |
| 1246 | goto out_master; |
| 1247 | |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 1248 | init_constants_master(c); |
| 1249 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1250 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
| 1251 | ubifs_msg("recovery needed"); |
| 1252 | c->need_recovery = 1; |
| 1253 | if (!mounted_read_only) { |
| 1254 | err = ubifs_recover_inl_heads(c, c->sbuf); |
| 1255 | if (err) |
| 1256 | goto out_master; |
| 1257 | } |
| 1258 | } else if (!mounted_read_only) { |
| 1259 | /* |
| 1260 | * Set the "dirty" flag so that if we reboot uncleanly we |
| 1261 | * will notice this immediately on the next mount. |
| 1262 | */ |
| 1263 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); |
| 1264 | err = ubifs_write_master(c); |
| 1265 | if (err) |
| 1266 | goto out_master; |
| 1267 | } |
| 1268 | |
| 1269 | err = ubifs_lpt_init(c, 1, !mounted_read_only); |
| 1270 | if (err) |
| 1271 | goto out_lpt; |
| 1272 | |
| 1273 | err = dbg_check_idx_size(c, c->old_idx_sz); |
| 1274 | if (err) |
| 1275 | goto out_lpt; |
| 1276 | |
| 1277 | err = ubifs_replay_journal(c); |
| 1278 | if (err) |
| 1279 | goto out_journal; |
| 1280 | |
Artem Bityutskiy | 1fb8bd0 | 2009-06-28 18:31:58 +0300 | [diff] [blame] | 1281 | /* Calculate 'min_idx_lebs' after journal replay */ |
| 1282 | c->min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
| 1283 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1284 | err = ubifs_mount_orphans(c, c->need_recovery, mounted_read_only); |
| 1285 | if (err) |
| 1286 | goto out_orphans; |
| 1287 | |
| 1288 | if (!mounted_read_only) { |
| 1289 | int lnum; |
| 1290 | |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1291 | err = check_free_space(c); |
| 1292 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1293 | goto out_orphans; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1294 | |
| 1295 | /* Check for enough log space */ |
| 1296 | lnum = c->lhead_lnum + 1; |
| 1297 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) |
| 1298 | lnum = UBIFS_LOG_LNUM; |
| 1299 | if (lnum == c->ltail_lnum) { |
| 1300 | err = ubifs_consolidate_log(c); |
| 1301 | if (err) |
| 1302 | goto out_orphans; |
| 1303 | } |
| 1304 | |
| 1305 | if (c->need_recovery) { |
| 1306 | err = ubifs_recover_size(c); |
| 1307 | if (err) |
| 1308 | goto out_orphans; |
| 1309 | err = ubifs_rcvry_gc_commit(c); |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1310 | } else { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1311 | err = take_gc_lnum(c); |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1312 | if (err) |
| 1313 | goto out_orphans; |
| 1314 | |
| 1315 | /* |
| 1316 | * GC LEB may contain garbage if there was an unclean |
| 1317 | * reboot, and it should be un-mapped. |
| 1318 | */ |
| 1319 | err = ubifs_leb_unmap(c, c->gc_lnum); |
| 1320 | if (err) |
| 1321 | return err; |
| 1322 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1323 | |
| 1324 | err = dbg_check_lprops(c); |
| 1325 | if (err) |
| 1326 | goto out_orphans; |
| 1327 | } else if (c->need_recovery) { |
| 1328 | err = ubifs_recover_size(c); |
| 1329 | if (err) |
| 1330 | goto out_orphans; |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1331 | } else { |
| 1332 | /* |
| 1333 | * Even if we mount read-only, we have to set space in GC LEB |
| 1334 | * to proper value because this affects UBIFS free space |
| 1335 | * reporting. We do not want to have a situation when |
| 1336 | * re-mounting from R/O to R/W changes amount of free space. |
| 1337 | */ |
| 1338 | err = take_gc_lnum(c); |
| 1339 | if (err) |
| 1340 | goto out_orphans; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1341 | } |
| 1342 | |
| 1343 | spin_lock(&ubifs_infos_lock); |
| 1344 | list_add_tail(&c->infos_list, &ubifs_infos); |
| 1345 | spin_unlock(&ubifs_infos_lock); |
| 1346 | |
| 1347 | if (c->need_recovery) { |
| 1348 | if (mounted_read_only) |
| 1349 | ubifs_msg("recovery deferred"); |
| 1350 | else { |
| 1351 | c->need_recovery = 0; |
| 1352 | ubifs_msg("recovery completed"); |
Artem Bityutskiy | b221337 | 2009-03-15 17:20:22 +0200 | [diff] [blame] | 1353 | /* |
| 1354 | * GC LEB has to be empty and taken at this point. But |
| 1355 | * the journal head LEBs may also be accounted as |
| 1356 | * "empty taken" if they are empty. |
| 1357 | */ |
| 1358 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1359 | } |
Artem Bityutskiy | 6ba87c9 | 2009-01-26 16:12:20 +0200 | [diff] [blame] | 1360 | } else |
Artem Bityutskiy | b221337 | 2009-03-15 17:20:22 +0200 | [diff] [blame] | 1361 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 1362 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1363 | err = dbg_check_filesystem(c); |
| 1364 | if (err) |
| 1365 | goto out_infos; |
| 1366 | |
Artem Bityutskiy | 6ba87c9 | 2009-01-26 16:12:20 +0200 | [diff] [blame] | 1367 | err = dbg_debugfs_init_fs(c); |
| 1368 | if (err) |
| 1369 | goto out_infos; |
| 1370 | |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1371 | c->always_chk_crc = 0; |
| 1372 | |
Artem Bityutskiy | ce769ca | 2008-07-18 12:54:21 +0300 | [diff] [blame] | 1373 | ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", |
| 1374 | c->vi.ubi_num, c->vi.vol_id, c->vi.name); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1375 | if (mounted_read_only) |
| 1376 | ubifs_msg("mounted read-only"); |
| 1377 | x = (long long)c->main_lebs * c->leb_size; |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1378 | ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d " |
| 1379 | "LEBs)", x, x >> 10, x >> 20, c->main_lebs); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1380 | x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1381 | ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d " |
| 1382 | "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt); |
Artem Bityutskiy | 963f0cf | 2009-03-26 12:51:21 +0200 | [diff] [blame] | 1383 | ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)", |
| 1384 | c->fmt_version, c->ro_compat_version, |
| 1385 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1386 | ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr)); |
Artem Bityutskiy | fae7fb2 | 2008-10-17 18:49:23 +0300 | [diff] [blame] | 1387 | ubifs_msg("reserved for root: %llu bytes (%llu KiB)", |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1388 | c->report_rp_size, c->report_rp_size >> 10); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1389 | |
| 1390 | dbg_msg("compiled on: " __DATE__ " at " __TIME__); |
| 1391 | dbg_msg("min. I/O unit size: %d bytes", c->min_io_size); |
| 1392 | dbg_msg("LEB size: %d bytes (%d KiB)", |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1393 | c->leb_size, c->leb_size >> 10); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1394 | dbg_msg("data journal heads: %d", |
| 1395 | c->jhead_cnt - NONDATA_JHEADS_CNT); |
Joe Perches | 7f2f4e7 | 2009-12-14 18:01:13 -0800 | [diff] [blame] | 1396 | dbg_msg("UUID: %pUB", c->uuid); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1397 | dbg_msg("big_lpt %d", c->big_lpt); |
| 1398 | dbg_msg("log LEBs: %d (%d - %d)", |
| 1399 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); |
| 1400 | dbg_msg("LPT area LEBs: %d (%d - %d)", |
| 1401 | c->lpt_lebs, c->lpt_first, c->lpt_last); |
| 1402 | dbg_msg("orphan area LEBs: %d (%d - %d)", |
| 1403 | c->orph_lebs, c->orph_first, c->orph_last); |
| 1404 | dbg_msg("main area LEBs: %d (%d - %d)", |
| 1405 | c->main_lebs, c->main_first, c->leb_cnt - 1); |
| 1406 | dbg_msg("index LEBs: %d", c->lst.idx_lebs); |
| 1407 | dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)", |
| 1408 | c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20); |
| 1409 | dbg_msg("key hash type: %d", c->key_hash_type); |
| 1410 | dbg_msg("tree fanout: %d", c->fanout); |
| 1411 | dbg_msg("reserved GC LEB: %d", c->gc_lnum); |
| 1412 | dbg_msg("first main LEB: %d", c->main_first); |
Artem Bityutskiy | 8e5033a | 2008-12-30 18:37:45 +0200 | [diff] [blame] | 1413 | dbg_msg("max. znode size %d", c->max_znode_sz); |
| 1414 | dbg_msg("max. index node size %d", c->max_idx_node_sz); |
| 1415 | dbg_msg("node sizes: data %zu, inode %zu, dentry %zu", |
| 1416 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); |
| 1417 | dbg_msg("node sizes: trun %zu, sb %zu, master %zu", |
| 1418 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); |
| 1419 | dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu", |
| 1420 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); |
| 1421 | dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu", |
| 1422 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, |
| 1423 | UBIFS_MAX_DENT_NODE_SZ); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1424 | dbg_msg("dead watermark: %d", c->dead_wm); |
| 1425 | dbg_msg("dark watermark: %d", c->dark_wm); |
Artem Bityutskiy | 8e5033a | 2008-12-30 18:37:45 +0200 | [diff] [blame] | 1426 | dbg_msg("LEB overhead: %d", c->leb_overhead); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1427 | x = (long long)c->main_lebs * c->dark_wm; |
| 1428 | dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)", |
| 1429 | x, x >> 10, x >> 20); |
| 1430 | dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)", |
| 1431 | c->max_bud_bytes, c->max_bud_bytes >> 10, |
| 1432 | c->max_bud_bytes >> 20); |
| 1433 | dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", |
| 1434 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, |
| 1435 | c->bg_bud_bytes >> 20); |
| 1436 | dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)", |
| 1437 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); |
| 1438 | dbg_msg("max. seq. number: %llu", c->max_sqnum); |
| 1439 | dbg_msg("commit number: %llu", c->cmt_no); |
| 1440 | |
| 1441 | return 0; |
| 1442 | |
| 1443 | out_infos: |
| 1444 | spin_lock(&ubifs_infos_lock); |
| 1445 | list_del(&c->infos_list); |
| 1446 | spin_unlock(&ubifs_infos_lock); |
| 1447 | out_orphans: |
| 1448 | free_orphans(c); |
| 1449 | out_journal: |
| 1450 | destroy_journal(c); |
| 1451 | out_lpt: |
| 1452 | ubifs_lpt_free(c, 0); |
| 1453 | out_master: |
| 1454 | kfree(c->mst_node); |
| 1455 | kfree(c->rcvrd_mst_node); |
| 1456 | if (c->bgt) |
| 1457 | kthread_stop(c->bgt); |
| 1458 | out_wbufs: |
| 1459 | free_wbufs(c); |
| 1460 | out_cbuf: |
| 1461 | kfree(c->cbuf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1462 | out_free: |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1463 | kfree(c->bu.buf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1464 | vfree(c->ileb_buf); |
| 1465 | vfree(c->sbuf); |
| 1466 | kfree(c->bottom_up_buf); |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1467 | ubifs_debugging_exit(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1468 | return err; |
| 1469 | } |
| 1470 | |
| 1471 | /** |
| 1472 | * ubifs_umount - un-mount UBIFS file-system. |
| 1473 | * @c: UBIFS file-system description object |
| 1474 | * |
| 1475 | * Note, this function is called to free allocated resourced when un-mounting, |
| 1476 | * as well as free resources when an error occurred while we were half way |
| 1477 | * through mounting (error path cleanup function). So it has to make sure the |
| 1478 | * resource was actually allocated before freeing it. |
| 1479 | */ |
| 1480 | static void ubifs_umount(struct ubifs_info *c) |
| 1481 | { |
| 1482 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, |
| 1483 | c->vi.vol_id); |
| 1484 | |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 1485 | dbg_debugfs_exit_fs(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1486 | spin_lock(&ubifs_infos_lock); |
| 1487 | list_del(&c->infos_list); |
| 1488 | spin_unlock(&ubifs_infos_lock); |
| 1489 | |
| 1490 | if (c->bgt) |
| 1491 | kthread_stop(c->bgt); |
| 1492 | |
| 1493 | destroy_journal(c); |
| 1494 | free_wbufs(c); |
| 1495 | free_orphans(c); |
| 1496 | ubifs_lpt_free(c, 0); |
| 1497 | |
| 1498 | kfree(c->cbuf); |
| 1499 | kfree(c->rcvrd_mst_node); |
| 1500 | kfree(c->mst_node); |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1501 | kfree(c->bu.buf); |
| 1502 | vfree(c->ileb_buf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1503 | vfree(c->sbuf); |
| 1504 | kfree(c->bottom_up_buf); |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1505 | ubifs_debugging_exit(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1506 | } |
| 1507 | |
| 1508 | /** |
| 1509 | * ubifs_remount_rw - re-mount in read-write mode. |
| 1510 | * @c: UBIFS file-system description object |
| 1511 | * |
| 1512 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only |
| 1513 | * mode. This function allocates the needed resources and re-mounts UBIFS in |
| 1514 | * read-write mode. |
| 1515 | */ |
| 1516 | static int ubifs_remount_rw(struct ubifs_info *c) |
| 1517 | { |
| 1518 | int err, lnum; |
| 1519 | |
Artem Bityutskiy | 963f0cf | 2009-03-26 12:51:21 +0200 | [diff] [blame] | 1520 | if (c->rw_incompat) { |
| 1521 | ubifs_err("the file-system is not R/W-compatible"); |
| 1522 | ubifs_msg("on-flash format version is w%d/r%d, but software " |
| 1523 | "only supports up to version w%d/r%d", c->fmt_version, |
| 1524 | c->ro_compat_version, UBIFS_FORMAT_VERSION, |
| 1525 | UBIFS_RO_COMPAT_VERSION); |
| 1526 | return -EROFS; |
| 1527 | } |
| 1528 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1529 | mutex_lock(&c->umount_mutex); |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1530 | dbg_save_space_info(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1531 | c->remounting_rw = 1; |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1532 | c->always_chk_crc = 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1533 | |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1534 | err = check_free_space(c); |
| 1535 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1536 | goto out; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1537 | |
| 1538 | if (c->old_leb_cnt != c->leb_cnt) { |
| 1539 | struct ubifs_sb_node *sup; |
| 1540 | |
| 1541 | sup = ubifs_read_sb_node(c); |
| 1542 | if (IS_ERR(sup)) { |
| 1543 | err = PTR_ERR(sup); |
| 1544 | goto out; |
| 1545 | } |
| 1546 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); |
| 1547 | err = ubifs_write_sb_node(c, sup); |
| 1548 | if (err) |
| 1549 | goto out; |
| 1550 | } |
| 1551 | |
| 1552 | if (c->need_recovery) { |
| 1553 | ubifs_msg("completing deferred recovery"); |
| 1554 | err = ubifs_write_rcvrd_mst_node(c); |
| 1555 | if (err) |
| 1556 | goto out; |
| 1557 | err = ubifs_recover_size(c); |
| 1558 | if (err) |
| 1559 | goto out; |
| 1560 | err = ubifs_clean_lebs(c, c->sbuf); |
| 1561 | if (err) |
| 1562 | goto out; |
| 1563 | err = ubifs_recover_inl_heads(c, c->sbuf); |
| 1564 | if (err) |
| 1565 | goto out; |
Adrian Hunter | 49d128a | 2009-01-26 10:55:40 +0200 | [diff] [blame] | 1566 | } else { |
| 1567 | /* A readonly mount is not allowed to have orphans */ |
| 1568 | ubifs_assert(c->tot_orphans == 0); |
| 1569 | err = ubifs_clear_orphans(c); |
| 1570 | if (err) |
| 1571 | goto out; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1572 | } |
| 1573 | |
| 1574 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { |
| 1575 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); |
| 1576 | err = ubifs_write_master(c); |
| 1577 | if (err) |
| 1578 | goto out; |
| 1579 | } |
| 1580 | |
| 1581 | c->ileb_buf = vmalloc(c->leb_size); |
| 1582 | if (!c->ileb_buf) { |
| 1583 | err = -ENOMEM; |
| 1584 | goto out; |
| 1585 | } |
| 1586 | |
| 1587 | err = ubifs_lpt_init(c, 0, 1); |
| 1588 | if (err) |
| 1589 | goto out; |
| 1590 | |
| 1591 | err = alloc_wbufs(c); |
| 1592 | if (err) |
| 1593 | goto out; |
| 1594 | |
| 1595 | ubifs_create_buds_lists(c); |
| 1596 | |
| 1597 | /* Create background thread */ |
Hunter Adrian | fcabb34 | 2009-03-18 12:29:39 +0100 | [diff] [blame] | 1598 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1599 | if (IS_ERR(c->bgt)) { |
| 1600 | err = PTR_ERR(c->bgt); |
| 1601 | c->bgt = NULL; |
| 1602 | ubifs_err("cannot spawn \"%s\", error %d", |
| 1603 | c->bgt_name, err); |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1604 | goto out; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1605 | } |
| 1606 | wake_up_process(c->bgt); |
| 1607 | |
| 1608 | c->orph_buf = vmalloc(c->leb_size); |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1609 | if (!c->orph_buf) { |
| 1610 | err = -ENOMEM; |
| 1611 | goto out; |
| 1612 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1613 | |
| 1614 | /* Check for enough log space */ |
| 1615 | lnum = c->lhead_lnum + 1; |
| 1616 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) |
| 1617 | lnum = UBIFS_LOG_LNUM; |
| 1618 | if (lnum == c->ltail_lnum) { |
| 1619 | err = ubifs_consolidate_log(c); |
| 1620 | if (err) |
| 1621 | goto out; |
| 1622 | } |
| 1623 | |
| 1624 | if (c->need_recovery) |
| 1625 | err = ubifs_rcvry_gc_commit(c); |
| 1626 | else |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1627 | err = ubifs_leb_unmap(c, c->gc_lnum); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1628 | if (err) |
| 1629 | goto out; |
| 1630 | |
| 1631 | if (c->need_recovery) { |
| 1632 | c->need_recovery = 0; |
| 1633 | ubifs_msg("deferred recovery completed"); |
| 1634 | } |
| 1635 | |
| 1636 | dbg_gen("re-mounted read-write"); |
| 1637 | c->vfs_sb->s_flags &= ~MS_RDONLY; |
| 1638 | c->remounting_rw = 0; |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1639 | c->always_chk_crc = 0; |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1640 | err = dbg_check_space_info(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1641 | mutex_unlock(&c->umount_mutex); |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1642 | return err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1643 | |
| 1644 | out: |
| 1645 | vfree(c->orph_buf); |
| 1646 | c->orph_buf = NULL; |
| 1647 | if (c->bgt) { |
| 1648 | kthread_stop(c->bgt); |
| 1649 | c->bgt = NULL; |
| 1650 | } |
| 1651 | free_wbufs(c); |
| 1652 | vfree(c->ileb_buf); |
| 1653 | c->ileb_buf = NULL; |
| 1654 | ubifs_lpt_free(c, 1); |
| 1655 | c->remounting_rw = 0; |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1656 | c->always_chk_crc = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1657 | mutex_unlock(&c->umount_mutex); |
| 1658 | return err; |
| 1659 | } |
| 1660 | |
| 1661 | /** |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1662 | * ubifs_remount_ro - re-mount in read-only mode. |
| 1663 | * @c: UBIFS file-system description object |
| 1664 | * |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1665 | * We assume VFS has stopped writing. Possibly the background thread could be |
| 1666 | * running a commit, however kthread_stop will wait in that case. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1667 | */ |
| 1668 | static void ubifs_remount_ro(struct ubifs_info *c) |
| 1669 | { |
| 1670 | int i, err; |
| 1671 | |
| 1672 | ubifs_assert(!c->need_recovery); |
Artem Bityutskiy | 6ba87c9 | 2009-01-26 16:12:20 +0200 | [diff] [blame] | 1673 | ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY)); |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1674 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1675 | mutex_lock(&c->umount_mutex); |
| 1676 | if (c->bgt) { |
| 1677 | kthread_stop(c->bgt); |
| 1678 | c->bgt = NULL; |
| 1679 | } |
| 1680 | |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1681 | dbg_save_space_info(c); |
| 1682 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1683 | for (i = 0; i < c->jhead_cnt; i++) { |
| 1684 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
Artem Bityutskiy | f2c5dbd | 2009-05-28 16:24:15 +0300 | [diff] [blame] | 1685 | hrtimer_cancel(&c->jheads[i].wbuf.timer); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1686 | } |
| 1687 | |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1688 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
| 1689 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); |
| 1690 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); |
| 1691 | err = ubifs_write_master(c); |
| 1692 | if (err) |
| 1693 | ubifs_ro_mode(c, err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1694 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1695 | free_wbufs(c); |
| 1696 | vfree(c->orph_buf); |
| 1697 | c->orph_buf = NULL; |
| 1698 | vfree(c->ileb_buf); |
| 1699 | c->ileb_buf = NULL; |
| 1700 | ubifs_lpt_free(c, 1); |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1701 | err = dbg_check_space_info(c); |
| 1702 | if (err) |
| 1703 | ubifs_ro_mode(c, err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1704 | mutex_unlock(&c->umount_mutex); |
| 1705 | } |
| 1706 | |
| 1707 | static void ubifs_put_super(struct super_block *sb) |
| 1708 | { |
| 1709 | int i; |
| 1710 | struct ubifs_info *c = sb->s_fs_info; |
| 1711 | |
| 1712 | ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num, |
| 1713 | c->vi.vol_id); |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 1714 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1715 | /* |
| 1716 | * The following asserts are only valid if there has not been a failure |
| 1717 | * of the media. For example, there will be dirty inodes if we failed |
| 1718 | * to write them back because of I/O errors. |
| 1719 | */ |
| 1720 | ubifs_assert(atomic_long_read(&c->dirty_pg_cnt) == 0); |
| 1721 | ubifs_assert(c->budg_idx_growth == 0); |
Artem Bityutskiy | 7d32c2b | 2008-07-18 18:54:29 +0300 | [diff] [blame] | 1722 | ubifs_assert(c->budg_dd_growth == 0); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1723 | ubifs_assert(c->budg_data_growth == 0); |
| 1724 | |
| 1725 | /* |
| 1726 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker |
| 1727 | * and file system un-mount. Namely, it prevents the shrinker from |
| 1728 | * picking this superblock for shrinking - it will be just skipped if |
| 1729 | * the mutex is locked. |
| 1730 | */ |
| 1731 | mutex_lock(&c->umount_mutex); |
| 1732 | if (!(c->vfs_sb->s_flags & MS_RDONLY)) { |
| 1733 | /* |
| 1734 | * First of all kill the background thread to make sure it does |
| 1735 | * not interfere with un-mounting and freeing resources. |
| 1736 | */ |
| 1737 | if (c->bgt) { |
| 1738 | kthread_stop(c->bgt); |
| 1739 | c->bgt = NULL; |
| 1740 | } |
| 1741 | |
| 1742 | /* Synchronize write-buffers */ |
| 1743 | if (c->jheads) |
Artem Bityutskiy | 0b335b9 | 2009-06-23 12:30:43 +0300 | [diff] [blame] | 1744 | for (i = 0; i < c->jhead_cnt; i++) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1745 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 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 | |
| 1781 | static 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 Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1793 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1794 | if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1795 | if (c->ro_media) { |
Adrian Hunter | b466f17 | 2009-01-29 12:59:33 +0200 | [diff] [blame] | 1796 | ubifs_msg("cannot re-mount due to prior errors"); |
Artem Bityutskiy | a2b9df3 | 2009-01-29 16:22:54 +0200 | [diff] [blame] | 1797 | return -EROFS; |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1798 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1799 | err = ubifs_remount_rw(c); |
Artem Bityutskiy | e9d6bbc | 2009-07-19 13:51:04 +0300 | [diff] [blame] | 1800 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1801 | return err; |
Adrian Hunter | b466f17 | 2009-01-29 12:59:33 +0200 | [diff] [blame] | 1802 | } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { |
| 1803 | if (c->ro_media) { |
| 1804 | ubifs_msg("cannot re-mount due to prior errors"); |
Artem Bityutskiy | a2b9df3 | 2009-01-29 16:22:54 +0200 | [diff] [blame] | 1805 | return -EROFS; |
Adrian Hunter | b466f17 | 2009-01-29 12:59:33 +0200 | [diff] [blame] | 1806 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1807 | ubifs_remount_ro(c); |
Adrian Hunter | b466f17 | 2009-01-29 12:59:33 +0200 | [diff] [blame] | 1808 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1809 | |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1810 | if (c->bulk_read == 1) |
| 1811 | bu_init(c); |
| 1812 | else { |
| 1813 | dbg_gen("disable bulk-read"); |
| 1814 | kfree(c->bu.buf); |
| 1815 | c->bu.buf = NULL; |
| 1816 | } |
| 1817 | |
Artem Bityutskiy | b221337 | 2009-03-15 17:20:22 +0200 | [diff] [blame] | 1818 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1819 | return 0; |
| 1820 | } |
| 1821 | |
Artem Bityutskiy | e8b8156 | 2009-01-15 17:43:23 +0200 | [diff] [blame] | 1822 | const struct super_operations ubifs_super_operations = { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1823 | .alloc_inode = ubifs_alloc_inode, |
| 1824 | .destroy_inode = ubifs_destroy_inode, |
| 1825 | .put_super = ubifs_put_super, |
| 1826 | .write_inode = ubifs_write_inode, |
| 1827 | .delete_inode = ubifs_delete_inode, |
| 1828 | .statfs = ubifs_statfs, |
| 1829 | .dirty_inode = ubifs_dirty_inode, |
| 1830 | .remount_fs = ubifs_remount_fs, |
| 1831 | .show_options = ubifs_show_options, |
| 1832 | .sync_fs = ubifs_sync_fs, |
| 1833 | }; |
| 1834 | |
| 1835 | /** |
| 1836 | * open_ubi - parse UBI device name string and open the UBI device. |
| 1837 | * @name: UBI volume name |
| 1838 | * @mode: UBI volume open mode |
| 1839 | * |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1840 | * The primary method of mounting UBIFS is by specifying the UBI volume |
| 1841 | * character device node path. However, UBIFS may also be mounted withoug any |
| 1842 | * character device node using one of the following methods: |
| 1843 | * |
| 1844 | * o ubiX_Y - mount UBI device number X, volume Y; |
| 1845 | * o ubiY - mount UBI device number 0, volume Y; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1846 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
| 1847 | * o ubi:NAME - mount UBI device 0, volume with name NAME. |
| 1848 | * |
| 1849 | * Alternative '!' separator may be used instead of ':' (because some shells |
| 1850 | * like busybox may interpret ':' as an NFS host name separator). This function |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1851 | * returns UBI volume description object in case of success and a negative |
| 1852 | * error code in case of failure. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1853 | */ |
| 1854 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) |
| 1855 | { |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1856 | struct ubi_volume_desc *ubi; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1857 | int dev, vol; |
| 1858 | char *endptr; |
| 1859 | |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1860 | /* First, try to open using the device node path method */ |
| 1861 | ubi = ubi_open_volume_path(name, mode); |
| 1862 | if (!IS_ERR(ubi)) |
| 1863 | return ubi; |
| 1864 | |
| 1865 | /* Try the "nodev" method */ |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1866 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
| 1867 | return ERR_PTR(-EINVAL); |
| 1868 | |
| 1869 | /* ubi:NAME method */ |
| 1870 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') |
| 1871 | return ubi_open_volume_nm(0, name + 4, mode); |
| 1872 | |
| 1873 | if (!isdigit(name[3])) |
| 1874 | return ERR_PTR(-EINVAL); |
| 1875 | |
| 1876 | dev = simple_strtoul(name + 3, &endptr, 0); |
| 1877 | |
| 1878 | /* ubiY method */ |
| 1879 | if (*endptr == '\0') |
| 1880 | return ubi_open_volume(0, dev, mode); |
| 1881 | |
| 1882 | /* ubiX_Y method */ |
| 1883 | if (*endptr == '_' && isdigit(endptr[1])) { |
| 1884 | vol = simple_strtoul(endptr + 1, &endptr, 0); |
| 1885 | if (*endptr != '\0') |
| 1886 | return ERR_PTR(-EINVAL); |
| 1887 | return ubi_open_volume(dev, vol, mode); |
| 1888 | } |
| 1889 | |
| 1890 | /* ubiX:NAME method */ |
| 1891 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') |
| 1892 | return ubi_open_volume_nm(dev, ++endptr, mode); |
| 1893 | |
| 1894 | return ERR_PTR(-EINVAL); |
| 1895 | } |
| 1896 | |
| 1897 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) |
| 1898 | { |
| 1899 | struct ubi_volume_desc *ubi = sb->s_fs_info; |
| 1900 | struct ubifs_info *c; |
| 1901 | struct inode *root; |
| 1902 | int err; |
| 1903 | |
| 1904 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); |
| 1905 | if (!c) |
| 1906 | return -ENOMEM; |
| 1907 | |
| 1908 | spin_lock_init(&c->cnt_lock); |
| 1909 | spin_lock_init(&c->cs_lock); |
| 1910 | spin_lock_init(&c->buds_lock); |
| 1911 | spin_lock_init(&c->space_lock); |
| 1912 | spin_lock_init(&c->orphan_lock); |
| 1913 | init_rwsem(&c->commit_sem); |
| 1914 | mutex_init(&c->lp_mutex); |
| 1915 | mutex_init(&c->tnc_mutex); |
| 1916 | mutex_init(&c->log_mutex); |
| 1917 | mutex_init(&c->mst_mutex); |
| 1918 | mutex_init(&c->umount_mutex); |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1919 | mutex_init(&c->bu_mutex); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1920 | init_waitqueue_head(&c->cmt_wq); |
| 1921 | c->buds = RB_ROOT; |
| 1922 | c->old_idx = RB_ROOT; |
| 1923 | c->size_tree = RB_ROOT; |
| 1924 | c->orph_tree = RB_ROOT; |
| 1925 | INIT_LIST_HEAD(&c->infos_list); |
| 1926 | INIT_LIST_HEAD(&c->idx_gc); |
| 1927 | INIT_LIST_HEAD(&c->replay_list); |
| 1928 | INIT_LIST_HEAD(&c->replay_buds); |
| 1929 | INIT_LIST_HEAD(&c->uncat_list); |
| 1930 | INIT_LIST_HEAD(&c->empty_list); |
| 1931 | INIT_LIST_HEAD(&c->freeable_list); |
| 1932 | INIT_LIST_HEAD(&c->frdi_idx_list); |
| 1933 | INIT_LIST_HEAD(&c->unclean_leb_list); |
| 1934 | INIT_LIST_HEAD(&c->old_buds); |
| 1935 | INIT_LIST_HEAD(&c->orph_list); |
| 1936 | INIT_LIST_HEAD(&c->orph_new); |
| 1937 | |
Artem Bityutskiy | 8379ea3 | 2009-05-29 12:34:52 +0300 | [diff] [blame] | 1938 | c->vfs_sb = sb; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1939 | c->highest_inum = UBIFS_FIRST_INO; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1940 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; |
| 1941 | |
| 1942 | ubi_get_volume_info(ubi, &c->vi); |
| 1943 | ubi_get_device_info(c->vi.ubi_num, &c->di); |
| 1944 | |
| 1945 | /* Re-open the UBI device in read-write mode */ |
| 1946 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); |
| 1947 | if (IS_ERR(c->ubi)) { |
| 1948 | err = PTR_ERR(c->ubi); |
| 1949 | goto out_free; |
| 1950 | } |
| 1951 | |
| 1952 | /* |
Artem Bityutskiy | 0a883a0 | 2008-08-13 14:13:26 +0300 | [diff] [blame] | 1953 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1954 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
| 1955 | * which means the user would have to wait not just for their own I/O |
Artem Bityutskiy | 0a883a0 | 2008-08-13 14:13:26 +0300 | [diff] [blame] | 1956 | * but the read-ahead I/O as well i.e. completely pointless. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1957 | * |
| 1958 | * Read-ahead will be disabled because @c->bdi.ra_pages is 0. |
| 1959 | */ |
Jens Axboe | d993831 | 2009-06-12 14:45:52 +0200 | [diff] [blame] | 1960 | c->bdi.name = "ubifs", |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1961 | c->bdi.capabilities = BDI_CAP_MAP_COPY; |
| 1962 | c->bdi.unplug_io_fn = default_unplug_io_fn; |
| 1963 | err = bdi_init(&c->bdi); |
| 1964 | if (err) |
| 1965 | goto out_close; |
Daniel Mack | 7fcd9c3 | 2009-07-02 17:15:47 +0200 | [diff] [blame] | 1966 | err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d", |
| 1967 | c->vi.ubi_num, c->vi.vol_id); |
Jens Axboe | a979eff | 2009-05-29 09:19:23 +0200 | [diff] [blame] | 1968 | if (err) |
| 1969 | goto out_bdi; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1970 | |
| 1971 | err = ubifs_parse_options(c, data, 0); |
| 1972 | if (err) |
| 1973 | goto out_bdi; |
| 1974 | |
Jens Axboe | 32a88aa | 2009-09-16 15:02:33 +0200 | [diff] [blame] | 1975 | sb->s_bdi = &c->bdi; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1976 | sb->s_fs_info = c; |
| 1977 | sb->s_magic = UBIFS_SUPER_MAGIC; |
| 1978 | sb->s_blocksize = UBIFS_BLOCK_SIZE; |
| 1979 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1980 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
| 1981 | if (c->max_inode_sz > MAX_LFS_FILESIZE) |
| 1982 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; |
| 1983 | sb->s_op = &ubifs_super_operations; |
| 1984 | |
| 1985 | mutex_lock(&c->umount_mutex); |
| 1986 | err = mount_ubifs(c); |
| 1987 | if (err) { |
| 1988 | ubifs_assert(err < 0); |
| 1989 | goto out_unlock; |
| 1990 | } |
| 1991 | |
| 1992 | /* Read the root inode */ |
| 1993 | root = ubifs_iget(sb, UBIFS_ROOT_INO); |
| 1994 | if (IS_ERR(root)) { |
| 1995 | err = PTR_ERR(root); |
| 1996 | goto out_umount; |
| 1997 | } |
| 1998 | |
| 1999 | sb->s_root = d_alloc_root(root); |
| 2000 | if (!sb->s_root) |
| 2001 | goto out_iput; |
| 2002 | |
| 2003 | mutex_unlock(&c->umount_mutex); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2004 | return 0; |
| 2005 | |
| 2006 | out_iput: |
| 2007 | iput(root); |
| 2008 | out_umount: |
| 2009 | ubifs_umount(c); |
| 2010 | out_unlock: |
| 2011 | mutex_unlock(&c->umount_mutex); |
| 2012 | out_bdi: |
| 2013 | bdi_destroy(&c->bdi); |
| 2014 | out_close: |
| 2015 | ubi_close_volume(c->ubi); |
| 2016 | out_free: |
| 2017 | kfree(c); |
| 2018 | return err; |
| 2019 | } |
| 2020 | |
| 2021 | static int sb_test(struct super_block *sb, void *data) |
| 2022 | { |
| 2023 | dev_t *dev = data; |
Artem Bityutskiy | 7c83f5c | 2009-05-25 19:23:04 +0300 | [diff] [blame] | 2024 | struct ubifs_info *c = sb->s_fs_info; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2025 | |
Artem Bityutskiy | 7c83f5c | 2009-05-25 19:23:04 +0300 | [diff] [blame] | 2026 | return c->vi.cdev == *dev; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2027 | } |
| 2028 | |
| 2029 | static int ubifs_get_sb(struct file_system_type *fs_type, int flags, |
| 2030 | const char *name, void *data, struct vfsmount *mnt) |
| 2031 | { |
| 2032 | struct ubi_volume_desc *ubi; |
| 2033 | struct ubi_volume_info vi; |
| 2034 | struct super_block *sb; |
| 2035 | int err; |
| 2036 | |
| 2037 | dbg_gen("name %s, flags %#x", name, flags); |
| 2038 | |
| 2039 | /* |
| 2040 | * Get UBI device number and volume ID. Mount it read-only so far |
| 2041 | * because this might be a new mount point, and UBI allows only one |
| 2042 | * read-write user at a time. |
| 2043 | */ |
| 2044 | ubi = open_ubi(name, UBI_READONLY); |
| 2045 | if (IS_ERR(ubi)) { |
| 2046 | ubifs_err("cannot open \"%s\", error %d", |
| 2047 | name, (int)PTR_ERR(ubi)); |
| 2048 | return PTR_ERR(ubi); |
| 2049 | } |
| 2050 | ubi_get_volume_info(ubi, &vi); |
| 2051 | |
| 2052 | dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id); |
| 2053 | |
Artem Bityutskiy | 7c83f5c | 2009-05-25 19:23:04 +0300 | [diff] [blame] | 2054 | sb = sget(fs_type, &sb_test, &set_anon_super, &vi.cdev); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2055 | if (IS_ERR(sb)) { |
| 2056 | err = PTR_ERR(sb); |
| 2057 | goto out_close; |
| 2058 | } |
| 2059 | |
| 2060 | if (sb->s_root) { |
| 2061 | /* A new mount point for already mounted UBIFS */ |
| 2062 | dbg_gen("this ubi volume is already mounted"); |
| 2063 | if ((flags ^ sb->s_flags) & MS_RDONLY) { |
| 2064 | err = -EBUSY; |
| 2065 | goto out_deact; |
| 2066 | } |
| 2067 | } else { |
| 2068 | sb->s_flags = flags; |
| 2069 | /* |
| 2070 | * Pass 'ubi' to 'fill_super()' in sb->s_fs_info where it is |
| 2071 | * replaced by 'c'. |
| 2072 | */ |
| 2073 | sb->s_fs_info = ubi; |
| 2074 | err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0); |
| 2075 | if (err) |
| 2076 | goto out_deact; |
| 2077 | /* We do not support atime */ |
| 2078 | sb->s_flags |= MS_ACTIVE | MS_NOATIME; |
| 2079 | } |
| 2080 | |
| 2081 | /* 'fill_super()' opens ubi again so we must close it here */ |
| 2082 | ubi_close_volume(ubi); |
| 2083 | |
Sukadev Bhattiprolu | a3ec947 | 2009-03-04 12:06:34 -0800 | [diff] [blame] | 2084 | simple_set_mnt(mnt, sb); |
| 2085 | return 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2086 | |
| 2087 | out_deact: |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 2088 | deactivate_locked_super(sb); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2089 | out_close: |
| 2090 | ubi_close_volume(ubi); |
| 2091 | return err; |
| 2092 | } |
| 2093 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2094 | static struct file_system_type ubifs_fs_type = { |
| 2095 | .name = "ubifs", |
| 2096 | .owner = THIS_MODULE, |
| 2097 | .get_sb = ubifs_get_sb, |
Artem Bityutskiy | 7c83f5c | 2009-05-25 19:23:04 +0300 | [diff] [blame] | 2098 | .kill_sb = kill_anon_super, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2099 | }; |
| 2100 | |
| 2101 | /* |
| 2102 | * Inode slab cache constructor. |
| 2103 | */ |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 2104 | static void inode_slab_ctor(void *obj) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2105 | { |
| 2106 | struct ubifs_inode *ui = obj; |
| 2107 | inode_init_once(&ui->vfs_inode); |
| 2108 | } |
| 2109 | |
| 2110 | static int __init ubifs_init(void) |
| 2111 | { |
| 2112 | int err; |
| 2113 | |
| 2114 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); |
| 2115 | |
| 2116 | /* Make sure node sizes are 8-byte aligned */ |
| 2117 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); |
| 2118 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); |
| 2119 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); |
| 2120 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); |
| 2121 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); |
| 2122 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); |
| 2123 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); |
| 2124 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); |
| 2125 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); |
| 2126 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); |
| 2127 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); |
| 2128 | |
| 2129 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); |
| 2130 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); |
| 2131 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); |
| 2132 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); |
| 2133 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); |
| 2134 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); |
| 2135 | |
| 2136 | /* Check min. node size */ |
| 2137 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); |
| 2138 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); |
| 2139 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); |
| 2140 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); |
| 2141 | |
| 2142 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2143 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2144 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2145 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2146 | |
| 2147 | /* Defined node sizes */ |
| 2148 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); |
| 2149 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); |
| 2150 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); |
| 2151 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); |
| 2152 | |
| 2153 | /* |
Artem Bityutskiy | a1dc080c2 | 2008-11-01 14:20:50 +0200 | [diff] [blame] | 2154 | * We use 2 bit wide bit-fields to store compression type, which should |
| 2155 | * be amended if more compressors are added. The bit-fields are: |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 2156 | * @compr_type in 'struct ubifs_inode', @default_compr in |
| 2157 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. |
Artem Bityutskiy | a1dc080c2 | 2008-11-01 14:20:50 +0200 | [diff] [blame] | 2158 | */ |
| 2159 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); |
| 2160 | |
| 2161 | /* |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2162 | * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to |
| 2163 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. |
| 2164 | */ |
| 2165 | if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) { |
| 2166 | ubifs_err("VFS page cache size is %u bytes, but UBIFS requires" |
| 2167 | " at least 4096 bytes", |
| 2168 | (unsigned int)PAGE_CACHE_SIZE); |
| 2169 | return -EINVAL; |
| 2170 | } |
| 2171 | |
| 2172 | err = register_filesystem(&ubifs_fs_type); |
| 2173 | if (err) { |
| 2174 | ubifs_err("cannot register file system, error %d", err); |
| 2175 | return err; |
| 2176 | } |
| 2177 | |
| 2178 | err = -ENOMEM; |
| 2179 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", |
| 2180 | sizeof(struct ubifs_inode), 0, |
| 2181 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT, |
| 2182 | &inode_slab_ctor); |
| 2183 | if (!ubifs_inode_slab) |
| 2184 | goto out_reg; |
| 2185 | |
| 2186 | register_shrinker(&ubifs_shrinker_info); |
| 2187 | |
| 2188 | err = ubifs_compressors_init(); |
| 2189 | if (err) |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 2190 | goto out_shrinker; |
| 2191 | |
| 2192 | err = dbg_debugfs_init(); |
| 2193 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2194 | goto out_compr; |
| 2195 | |
| 2196 | return 0; |
| 2197 | |
| 2198 | out_compr: |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 2199 | ubifs_compressors_exit(); |
| 2200 | out_shrinker: |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2201 | unregister_shrinker(&ubifs_shrinker_info); |
| 2202 | kmem_cache_destroy(ubifs_inode_slab); |
| 2203 | out_reg: |
| 2204 | unregister_filesystem(&ubifs_fs_type); |
| 2205 | return err; |
| 2206 | } |
| 2207 | /* late_initcall to let compressors initialize first */ |
| 2208 | late_initcall(ubifs_init); |
| 2209 | |
| 2210 | static void __exit ubifs_exit(void) |
| 2211 | { |
| 2212 | ubifs_assert(list_empty(&ubifs_infos)); |
| 2213 | ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0); |
| 2214 | |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 2215 | dbg_debugfs_exit(); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2216 | ubifs_compressors_exit(); |
| 2217 | unregister_shrinker(&ubifs_shrinker_info); |
| 2218 | kmem_cache_destroy(ubifs_inode_slab); |
| 2219 | unregister_filesystem(&ubifs_fs_type); |
| 2220 | } |
| 2221 | module_exit(ubifs_exit); |
| 2222 | |
| 2223 | MODULE_LICENSE("GPL"); |
| 2224 | MODULE_VERSION(__stringify(UBIFS_VERSION)); |
| 2225 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); |
| 2226 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |