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 | |
Artem Bityutskiy | a29fa9d | 2011-05-26 09:43:34 +0300 | [diff] [blame] | 88 | if (ui->xattr && !S_ISREG(inode->i_mode)) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 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 | |
Artem Bityutskiy | 1b51e98 | 2011-05-25 17:38:29 +0300 | [diff] [blame] | 97 | err = dbg_check_dir(c, inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 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); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 132 | set_nlink(inode, le32_to_cpu(ino->nlink)); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 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 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 275 | static void ubifs_i_callback(struct rcu_head *head) |
| 276 | { |
| 277 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 278 | struct ubifs_inode *ui = ubifs_inode(inode); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 279 | kmem_cache_free(ubifs_inode_slab, ui); |
| 280 | } |
| 281 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 282 | static void ubifs_destroy_inode(struct inode *inode) |
| 283 | { |
| 284 | struct ubifs_inode *ui = ubifs_inode(inode); |
| 285 | |
| 286 | kfree(ui->data); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 287 | call_rcu(&inode->i_rcu, ubifs_i_callback); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | /* |
| 291 | * Note, Linux write-back code calls this without 'i_mutex'. |
| 292 | */ |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 293 | static int ubifs_write_inode(struct inode *inode, struct writeback_control *wbc) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 294 | { |
Artem Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 295 | int err = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 296 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
| 297 | struct ubifs_inode *ui = ubifs_inode(inode); |
| 298 | |
| 299 | ubifs_assert(!ui->xattr); |
| 300 | if (is_bad_inode(inode)) |
| 301 | return 0; |
| 302 | |
| 303 | mutex_lock(&ui->ui_mutex); |
| 304 | /* |
| 305 | * Due to races between write-back forced by budgeting |
| 306 | * (see 'sync_some_inodes()') and pdflush write-back, the inode may |
| 307 | * have already been synchronized, do not do this again. This might |
| 308 | * also happen if it was synchronized in an VFS operation, e.g. |
| 309 | * 'ubifs_link()'. |
| 310 | */ |
| 311 | if (!ui->dirty) { |
| 312 | mutex_unlock(&ui->ui_mutex); |
| 313 | return 0; |
| 314 | } |
| 315 | |
Artem Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 316 | /* |
| 317 | * As an optimization, do not write orphan inodes to the media just |
| 318 | * because this is not needed. |
| 319 | */ |
| 320 | dbg_gen("inode %lu, mode %#x, nlink %u", |
| 321 | inode->i_ino, (int)inode->i_mode, inode->i_nlink); |
| 322 | if (inode->i_nlink) { |
Artem Bityutskiy | 1f28681 | 2008-07-22 12:06:13 +0300 | [diff] [blame] | 323 | err = ubifs_jnl_write_inode(c, inode); |
Artem Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 324 | if (err) |
| 325 | ubifs_err("can't write inode %lu, error %d", |
| 326 | inode->i_ino, err); |
Artem Bityutskiy | e3c3efc | 2009-08-27 16:34:19 +0300 | [diff] [blame] | 327 | else |
| 328 | err = dbg_check_inode_size(c, inode, ui->ui_size); |
Artem Bityutskiy | fbfa6c8 | 2008-07-22 11:52:52 +0300 | [diff] [blame] | 329 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 330 | |
| 331 | ui->dirty = 0; |
| 332 | mutex_unlock(&ui->ui_mutex); |
| 333 | ubifs_release_dirty_inode_budget(c, ui); |
| 334 | return err; |
| 335 | } |
| 336 | |
Al Viro | d640e1b | 2010-06-07 00:34:05 -0400 | [diff] [blame] | 337 | static void ubifs_evict_inode(struct inode *inode) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 338 | { |
| 339 | int err; |
| 340 | struct ubifs_info *c = inode->i_sb->s_fs_info; |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 341 | struct ubifs_inode *ui = ubifs_inode(inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 342 | |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 343 | if (ui->xattr) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 344 | /* |
| 345 | * Extended attribute inode deletions are fully handled in |
| 346 | * 'ubifs_removexattr()'. These inodes are special and have |
| 347 | * limited usage, so there is nothing to do here. |
| 348 | */ |
| 349 | goto out; |
| 350 | |
Artem Bityutskiy | 7d32c2b | 2008-07-18 18:54:29 +0300 | [diff] [blame] | 351 | 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] | 352 | ubifs_assert(!atomic_read(&inode->i_count)); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 353 | |
| 354 | truncate_inode_pages(&inode->i_data, 0); |
Al Viro | d640e1b | 2010-06-07 00:34:05 -0400 | [diff] [blame] | 355 | |
| 356 | if (inode->i_nlink) |
| 357 | goto done; |
| 358 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 359 | if (is_bad_inode(inode)) |
| 360 | goto out; |
| 361 | |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 362 | ui->ui_size = inode->i_size = 0; |
Artem Bityutskiy | de94eb5 | 2008-07-22 13:06:20 +0300 | [diff] [blame] | 363 | err = ubifs_jnl_delete_inode(c, inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 364 | if (err) |
| 365 | /* |
| 366 | * Worst case we have a lost orphan inode wasting space, so a |
Artem Bityutskiy | 0a883a0 | 2008-08-13 14:13:26 +0300 | [diff] [blame] | 367 | * simple error message is OK here. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 368 | */ |
Artem Bityutskiy | de94eb5 | 2008-07-22 13:06:20 +0300 | [diff] [blame] | 369 | ubifs_err("can't delete inode %lu, error %d", |
| 370 | inode->i_ino, err); |
| 371 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 372 | out: |
Artem Bityutskiy | 1e0f358 | 2008-07-21 10:59:53 +0300 | [diff] [blame] | 373 | if (ui->dirty) |
| 374 | ubifs_release_dirty_inode_budget(c, ui); |
Adrian Hunter | 6d6cb0d | 2009-04-08 14:07:57 +0200 | [diff] [blame] | 375 | else { |
| 376 | /* We've deleted something - clean the "no space" flags */ |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 377 | c->bi.nospace = c->bi.nospace_rp = 0; |
Adrian Hunter | 6d6cb0d | 2009-04-08 14:07:57 +0200 | [diff] [blame] | 378 | smp_wmb(); |
| 379 | } |
Al Viro | d640e1b | 2010-06-07 00:34:05 -0400 | [diff] [blame] | 380 | done: |
| 381 | end_writeback(inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 382 | } |
| 383 | |
Christoph Hellwig | aa38572 | 2011-05-27 06:53:02 -0400 | [diff] [blame] | 384 | static void ubifs_dirty_inode(struct inode *inode, int flags) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 385 | { |
| 386 | struct ubifs_inode *ui = ubifs_inode(inode); |
| 387 | |
| 388 | ubifs_assert(mutex_is_locked(&ui->ui_mutex)); |
| 389 | if (!ui->dirty) { |
| 390 | ui->dirty = 1; |
| 391 | dbg_gen("inode %lu", inode->i_ino); |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 396 | { |
| 397 | struct ubifs_info *c = dentry->d_sb->s_fs_info; |
| 398 | unsigned long long free; |
Artem Bityutskiy | 7c7cbad | 2008-09-03 14:16:42 +0300 | [diff] [blame] | 399 | __le32 *uuid = (__le32 *)c->uuid; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 400 | |
Artem Bityutskiy | 7dad181 | 2008-08-25 18:58:19 +0300 | [diff] [blame] | 401 | free = ubifs_get_free_space(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 402 | dbg_gen("free space %lld bytes (%lld blocks)", |
| 403 | free, free >> UBIFS_BLOCK_SHIFT); |
| 404 | |
| 405 | buf->f_type = UBIFS_SUPER_MAGIC; |
| 406 | buf->f_bsize = UBIFS_BLOCK_SIZE; |
| 407 | buf->f_blocks = c->block_cnt; |
| 408 | buf->f_bfree = free >> UBIFS_BLOCK_SHIFT; |
| 409 | if (free > c->report_rp_size) |
| 410 | buf->f_bavail = (free - c->report_rp_size) >> UBIFS_BLOCK_SHIFT; |
| 411 | else |
| 412 | buf->f_bavail = 0; |
| 413 | buf->f_files = 0; |
| 414 | buf->f_ffree = 0; |
| 415 | buf->f_namelen = UBIFS_MAX_NLEN; |
Artem Bityutskiy | 7c7cbad | 2008-09-03 14:16:42 +0300 | [diff] [blame] | 416 | buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); |
| 417 | 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] | 418 | ubifs_assert(buf->f_bfree <= c->block_cnt); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 419 | return 0; |
| 420 | } |
| 421 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 422 | static int ubifs_show_options(struct seq_file *s, struct dentry *root) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 423 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 424 | struct ubifs_info *c = root->d_sb->s_fs_info; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 425 | |
| 426 | if (c->mount_opts.unmount_mode == 2) |
| 427 | seq_printf(s, ",fast_unmount"); |
| 428 | else if (c->mount_opts.unmount_mode == 1) |
| 429 | seq_printf(s, ",norm_unmount"); |
| 430 | |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 431 | if (c->mount_opts.bulk_read == 2) |
| 432 | seq_printf(s, ",bulk_read"); |
| 433 | else if (c->mount_opts.bulk_read == 1) |
| 434 | seq_printf(s, ",no_bulk_read"); |
| 435 | |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 436 | if (c->mount_opts.chk_data_crc == 2) |
| 437 | seq_printf(s, ",chk_data_crc"); |
| 438 | else if (c->mount_opts.chk_data_crc == 1) |
| 439 | seq_printf(s, ",no_chk_data_crc"); |
| 440 | |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 441 | if (c->mount_opts.override_compr) { |
Hunter Adrian | fcabb34 | 2009-03-18 12:29:39 +0100 | [diff] [blame] | 442 | seq_printf(s, ",compr=%s", |
| 443 | ubifs_compr_name(c->mount_opts.compr_type)); |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 444 | } |
| 445 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | static int ubifs_sync_fs(struct super_block *sb, int wait) |
| 450 | { |
Artem Bityutskiy | f103830 | 2008-12-28 08:16:32 +0200 | [diff] [blame] | 451 | int i, err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 452 | struct ubifs_info *c = sb->s_fs_info; |
Artem Bityutskiy | 304d427 | 2008-12-28 08:04:17 +0200 | [diff] [blame] | 453 | |
Artem Bityutskiy | e8ea175 | 2009-01-06 14:40:23 -0800 | [diff] [blame] | 454 | /* |
Artem Bityutskiy | dedb0d4 | 2009-01-09 21:02:37 +0200 | [diff] [blame] | 455 | * Zero @wait is just an advisory thing to help the file system shove |
| 456 | * lots of data into the queues, and there will be the second |
Artem Bityutskiy | e8ea175 | 2009-01-06 14:40:23 -0800 | [diff] [blame] | 457 | * '->sync_fs()' call, with non-zero @wait. |
| 458 | */ |
Artem Bityutskiy | dedb0d4 | 2009-01-09 21:02:37 +0200 | [diff] [blame] | 459 | if (!wait) |
| 460 | return 0; |
Artem Bityutskiy | e8ea175 | 2009-01-06 14:40:23 -0800 | [diff] [blame] | 461 | |
Artem Bityutskiy | f103830 | 2008-12-28 08:16:32 +0200 | [diff] [blame] | 462 | /* |
Adrian Hunter | 3eb1429 | 2009-01-29 11:17:24 +0200 | [diff] [blame] | 463 | * Synchronize write buffers, because 'ubifs_run_commit()' does not |
| 464 | * do this if it waits for an already running commit. |
| 465 | */ |
| 466 | for (i = 0; i < c->jhead_cnt; i++) { |
| 467 | err = ubifs_wbuf_sync(&c->jheads[i].wbuf); |
| 468 | if (err) |
| 469 | return err; |
| 470 | } |
| 471 | |
Artem Bityutskiy | 887ee17 | 2009-07-20 17:56:19 +0300 | [diff] [blame] | 472 | /* |
| 473 | * Strictly speaking, it is not necessary to commit the journal here, |
| 474 | * synchronizing write-buffers would be enough. But committing makes |
| 475 | * UBIFS free space predictions much more accurate, so we want to let |
| 476 | * the user be able to get more accurate results of 'statfs()' after |
| 477 | * they synchronize the file system. |
| 478 | */ |
Artem Bityutskiy | f103830 | 2008-12-28 08:16:32 +0200 | [diff] [blame] | 479 | err = ubifs_run_commit(c); |
| 480 | if (err) |
| 481 | return err; |
Artem Bityutskiy | 403e12a | 2008-09-09 12:31:37 +0300 | [diff] [blame] | 482 | |
Artem Bityutskiy | cb5c6a2 | 2008-12-28 08:18:43 +0200 | [diff] [blame] | 483 | return ubi_sync(c->vi.ubi_num); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | /** |
| 487 | * init_constants_early - initialize UBIFS constants. |
| 488 | * @c: UBIFS file-system description object |
| 489 | * |
| 490 | * This function initialize UBIFS constants which do not need the superblock to |
| 491 | * be read. It also checks that the UBI volume satisfies basic UBIFS |
| 492 | * requirements. Returns zero in case of success and a negative error code in |
| 493 | * case of failure. |
| 494 | */ |
| 495 | static int init_constants_early(struct ubifs_info *c) |
| 496 | { |
| 497 | if (c->vi.corrupted) { |
| 498 | ubifs_warn("UBI volume is corrupted - read-only mode"); |
| 499 | c->ro_media = 1; |
| 500 | } |
| 501 | |
| 502 | if (c->di.ro_mode) { |
| 503 | ubifs_msg("read-only UBI device"); |
| 504 | c->ro_media = 1; |
| 505 | } |
| 506 | |
| 507 | if (c->vi.vol_type == UBI_STATIC_VOLUME) { |
| 508 | ubifs_msg("static UBI volume - read-only mode"); |
| 509 | c->ro_media = 1; |
| 510 | } |
| 511 | |
| 512 | c->leb_cnt = c->vi.size; |
| 513 | c->leb_size = c->vi.usable_leb_size; |
Artem Bityutskiy | ca2ec61 | 2011-02-14 15:17:55 +0200 | [diff] [blame] | 514 | c->leb_start = c->di.leb_start; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 515 | c->half_leb_size = c->leb_size / 2; |
| 516 | c->min_io_size = c->di.min_io_size; |
| 517 | c->min_io_shift = fls(c->min_io_size) - 1; |
Artem Bityutskiy | 3e8e2e0 | 2011-01-30 18:58:32 +0200 | [diff] [blame] | 518 | c->max_write_size = c->di.max_write_size; |
| 519 | c->max_write_shift = fls(c->max_write_size) - 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 520 | |
| 521 | if (c->leb_size < UBIFS_MIN_LEB_SZ) { |
| 522 | ubifs_err("too small LEBs (%d bytes), min. is %d bytes", |
| 523 | c->leb_size, UBIFS_MIN_LEB_SZ); |
| 524 | return -EINVAL; |
| 525 | } |
| 526 | |
| 527 | if (c->leb_cnt < UBIFS_MIN_LEB_CNT) { |
| 528 | ubifs_err("too few LEBs (%d), min. is %d", |
| 529 | c->leb_cnt, UBIFS_MIN_LEB_CNT); |
| 530 | return -EINVAL; |
| 531 | } |
| 532 | |
| 533 | if (!is_power_of_2(c->min_io_size)) { |
| 534 | ubifs_err("bad min. I/O size %d", c->min_io_size); |
| 535 | return -EINVAL; |
| 536 | } |
| 537 | |
| 538 | /* |
Artem Bityutskiy | 3e8e2e0 | 2011-01-30 18:58:32 +0200 | [diff] [blame] | 539 | * Maximum write size has to be greater or equivalent to min. I/O |
| 540 | * size, and be multiple of min. I/O size. |
| 541 | */ |
| 542 | if (c->max_write_size < c->min_io_size || |
| 543 | c->max_write_size % c->min_io_size || |
| 544 | !is_power_of_2(c->max_write_size)) { |
| 545 | ubifs_err("bad write buffer size %d for %d min. I/O unit", |
| 546 | c->max_write_size, c->min_io_size); |
| 547 | return -EINVAL; |
| 548 | } |
| 549 | |
| 550 | /* |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 551 | * UBIFS aligns all node to 8-byte boundary, so to make function in |
| 552 | * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is |
| 553 | * less than 8. |
| 554 | */ |
| 555 | if (c->min_io_size < 8) { |
| 556 | c->min_io_size = 8; |
| 557 | c->min_io_shift = 3; |
Artem Bityutskiy | 3e8e2e0 | 2011-01-30 18:58:32 +0200 | [diff] [blame] | 558 | if (c->max_write_size < c->min_io_size) { |
| 559 | c->max_write_size = c->min_io_size; |
| 560 | c->max_write_shift = c->min_io_shift; |
| 561 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size); |
| 565 | c->mst_node_alsz = ALIGN(UBIFS_MST_NODE_SZ, c->min_io_size); |
| 566 | |
| 567 | /* |
| 568 | * Initialize node length ranges which are mostly needed for node |
| 569 | * length validation. |
| 570 | */ |
| 571 | c->ranges[UBIFS_PAD_NODE].len = UBIFS_PAD_NODE_SZ; |
| 572 | c->ranges[UBIFS_SB_NODE].len = UBIFS_SB_NODE_SZ; |
| 573 | c->ranges[UBIFS_MST_NODE].len = UBIFS_MST_NODE_SZ; |
| 574 | c->ranges[UBIFS_REF_NODE].len = UBIFS_REF_NODE_SZ; |
| 575 | c->ranges[UBIFS_TRUN_NODE].len = UBIFS_TRUN_NODE_SZ; |
| 576 | c->ranges[UBIFS_CS_NODE].len = UBIFS_CS_NODE_SZ; |
| 577 | |
| 578 | c->ranges[UBIFS_INO_NODE].min_len = UBIFS_INO_NODE_SZ; |
| 579 | c->ranges[UBIFS_INO_NODE].max_len = UBIFS_MAX_INO_NODE_SZ; |
| 580 | c->ranges[UBIFS_ORPH_NODE].min_len = |
| 581 | UBIFS_ORPH_NODE_SZ + sizeof(__le64); |
| 582 | c->ranges[UBIFS_ORPH_NODE].max_len = c->leb_size; |
| 583 | c->ranges[UBIFS_DENT_NODE].min_len = UBIFS_DENT_NODE_SZ; |
| 584 | c->ranges[UBIFS_DENT_NODE].max_len = UBIFS_MAX_DENT_NODE_SZ; |
| 585 | c->ranges[UBIFS_XENT_NODE].min_len = UBIFS_XENT_NODE_SZ; |
| 586 | c->ranges[UBIFS_XENT_NODE].max_len = UBIFS_MAX_XENT_NODE_SZ; |
| 587 | c->ranges[UBIFS_DATA_NODE].min_len = UBIFS_DATA_NODE_SZ; |
| 588 | c->ranges[UBIFS_DATA_NODE].max_len = UBIFS_MAX_DATA_NODE_SZ; |
| 589 | /* |
| 590 | * Minimum indexing node size is amended later when superblock is |
| 591 | * read and the key length is known. |
| 592 | */ |
| 593 | c->ranges[UBIFS_IDX_NODE].min_len = UBIFS_IDX_NODE_SZ + UBIFS_BRANCH_SZ; |
| 594 | /* |
| 595 | * Maximum indexing node size is amended later when superblock is |
| 596 | * read and the fanout is known. |
| 597 | */ |
| 598 | c->ranges[UBIFS_IDX_NODE].max_len = INT_MAX; |
| 599 | |
| 600 | /* |
Artem Bityutskiy | 7078202 | 2009-01-19 19:57:27 +0200 | [diff] [blame] | 601 | * Initialize dead and dark LEB space watermarks. See gc.c for comments |
| 602 | * about these values. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 603 | */ |
| 604 | c->dead_wm = ALIGN(MIN_WRITE_SZ, c->min_io_size); |
| 605 | c->dark_wm = ALIGN(UBIFS_MAX_NODE_SZ, c->min_io_size); |
| 606 | |
Artem Bityutskiy | 9bbb572 | 2008-08-22 18:23:22 +0300 | [diff] [blame] | 607 | /* |
| 608 | * Calculate how many bytes would be wasted at the end of LEB if it was |
| 609 | * fully filled with data nodes of maximum size. This is used in |
| 610 | * calculations when reporting free space. |
| 611 | */ |
| 612 | c->leb_overhead = c->leb_size % UBIFS_MAX_DATA_NODE_SZ; |
Artem Bityutskiy | 39ce81c | 2008-11-18 18:09:49 +0200 | [diff] [blame] | 613 | |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 614 | /* Buffer size for bulk-reads */ |
Artem Bityutskiy | 6c0c42c | 2008-11-18 20:20:05 +0200 | [diff] [blame] | 615 | c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ; |
| 616 | if (c->max_bu_buf_len > c->leb_size) |
| 617 | c->max_bu_buf_len = c->leb_size; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | /** |
| 622 | * bud_wbuf_callback - bud LEB write-buffer synchronization call-back. |
| 623 | * @c: UBIFS file-system description object |
| 624 | * @lnum: LEB the write-buffer was synchronized to |
| 625 | * @free: how many free bytes left in this LEB |
| 626 | * @pad: how many bytes were padded |
| 627 | * |
| 628 | * This is a callback function which is called by the I/O unit when the |
| 629 | * write-buffer is synchronized. We need this to correctly maintain space |
| 630 | * accounting in bud logical eraseblocks. This function returns zero in case of |
| 631 | * success and a negative error code in case of failure. |
| 632 | * |
| 633 | * This function actually belongs to the journal, but we keep it here because |
| 634 | * we want to keep it static. |
| 635 | */ |
| 636 | static int bud_wbuf_callback(struct ubifs_info *c, int lnum, int free, int pad) |
| 637 | { |
| 638 | return ubifs_update_one_lp(c, lnum, free, pad, 0, 0); |
| 639 | } |
| 640 | |
| 641 | /* |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 642 | * init_constants_sb - initialize UBIFS constants. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 643 | * @c: UBIFS file-system description object |
| 644 | * |
| 645 | * This is a helper function which initializes various UBIFS constants after |
| 646 | * the superblock has been read. It also checks various UBIFS parameters and |
| 647 | * makes sure they are all right. Returns zero in case of success and a |
| 648 | * negative error code in case of failure. |
| 649 | */ |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 650 | static int init_constants_sb(struct ubifs_info *c) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 651 | { |
| 652 | int tmp, err; |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 653 | long long tmp64; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 654 | |
| 655 | c->main_bytes = (long long)c->main_lebs * c->leb_size; |
| 656 | c->max_znode_sz = sizeof(struct ubifs_znode) + |
| 657 | c->fanout * sizeof(struct ubifs_zbranch); |
| 658 | |
| 659 | tmp = ubifs_idx_node_sz(c, 1); |
| 660 | c->ranges[UBIFS_IDX_NODE].min_len = tmp; |
| 661 | c->min_idx_node_sz = ALIGN(tmp, 8); |
| 662 | |
| 663 | tmp = ubifs_idx_node_sz(c, c->fanout); |
| 664 | c->ranges[UBIFS_IDX_NODE].max_len = tmp; |
| 665 | c->max_idx_node_sz = ALIGN(tmp, 8); |
| 666 | |
| 667 | /* Make sure LEB size is large enough to fit full commit */ |
| 668 | tmp = UBIFS_CS_NODE_SZ + UBIFS_REF_NODE_SZ * c->jhead_cnt; |
| 669 | tmp = ALIGN(tmp, c->min_io_size); |
| 670 | if (tmp > c->leb_size) { |
| 671 | dbg_err("too small LEB size %d, at least %d needed", |
| 672 | c->leb_size, tmp); |
| 673 | return -EINVAL; |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | * Make sure that the log is large enough to fit reference nodes for |
| 678 | * all buds plus one reserved LEB. |
| 679 | */ |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 680 | tmp64 = c->max_bud_bytes + c->leb_size - 1; |
| 681 | c->max_bud_cnt = div_u64(tmp64, c->leb_size); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 682 | tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1); |
| 683 | tmp /= c->leb_size; |
| 684 | tmp += 1; |
| 685 | if (c->log_lebs < tmp) { |
| 686 | dbg_err("too small log %d LEBs, required min. %d LEBs", |
| 687 | c->log_lebs, tmp); |
| 688 | return -EINVAL; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * When budgeting we assume worst-case scenarios when the pages are not |
| 693 | * be compressed and direntries are of the maximum size. |
| 694 | * |
| 695 | * Note, data, which may be stored in inodes is budgeted separately, so |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 696 | * it is not included into 'c->bi.inode_budget'. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 697 | */ |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 698 | c->bi.page_budget = UBIFS_MAX_DATA_NODE_SZ * UBIFS_BLOCKS_PER_PAGE; |
| 699 | c->bi.inode_budget = UBIFS_INO_NODE_SZ; |
| 700 | c->bi.dent_budget = UBIFS_MAX_DENT_NODE_SZ; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 701 | |
| 702 | /* |
| 703 | * When the amount of flash space used by buds becomes |
| 704 | * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit. |
| 705 | * The writers are unblocked when the commit is finished. To avoid |
| 706 | * writers to be blocked UBIFS initiates background commit in advance, |
| 707 | * when number of bud bytes becomes above the limit defined below. |
| 708 | */ |
| 709 | c->bg_bud_bytes = (c->max_bud_bytes * 13) >> 4; |
| 710 | |
| 711 | /* |
| 712 | * Ensure minimum journal size. All the bytes in the journal heads are |
| 713 | * considered to be used, when calculating the current journal usage. |
| 714 | * Consequently, if the journal is too small, UBIFS will treat it as |
| 715 | * always full. |
| 716 | */ |
Artem Bityutskiy | 4d61db4 | 2008-12-18 14:06:51 +0200 | [diff] [blame] | 717 | tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 718 | if (c->bg_bud_bytes < tmp64) |
| 719 | c->bg_bud_bytes = tmp64; |
| 720 | if (c->max_bud_bytes < tmp64 + c->leb_size) |
| 721 | c->max_bud_bytes = tmp64 + c->leb_size; |
| 722 | |
| 723 | err = ubifs_calc_lpt_geom(c); |
| 724 | if (err) |
| 725 | return err; |
| 726 | |
Artem Bityutskiy | fb1cd01 | 2009-03-16 09:56:57 +0200 | [diff] [blame] | 727 | /* Initialize effective LEB size used in budgeting calculations */ |
| 728 | c->idx_leb_size = c->leb_size - c->max_idx_node_sz; |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 729 | return 0; |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * init_constants_master - initialize UBIFS constants. |
| 734 | * @c: UBIFS file-system description object |
| 735 | * |
| 736 | * This is a helper function which initializes various UBIFS constants after |
| 737 | * the master node has been read. It also checks various UBIFS parameters and |
| 738 | * makes sure they are all right. |
| 739 | */ |
| 740 | static void init_constants_master(struct ubifs_info *c) |
| 741 | { |
| 742 | long long tmp64; |
| 743 | |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 744 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
Artem Bityutskiy | fb1cd01 | 2009-03-16 09:56:57 +0200 | [diff] [blame] | 745 | c->report_rp_size = ubifs_reported_space(c, c->rp_size); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 746 | |
| 747 | /* |
| 748 | * Calculate total amount of FS blocks. This number is not used |
| 749 | * internally because it does not make much sense for UBIFS, but it is |
| 750 | * necessary to report something for the 'statfs()' call. |
| 751 | * |
Artem Bityutskiy | 7dad181 | 2008-08-25 18:58:19 +0300 | [diff] [blame] | 752 | * Subtract the LEB reserved for GC, the LEB which is reserved for |
Artem Bityutskiy | af14a1a | 2008-12-19 19:26:29 +0200 | [diff] [blame] | 753 | * deletions, minimum LEBs for the index, and assume only one journal |
| 754 | * head is available. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 755 | */ |
Artem Bityutskiy | af14a1a | 2008-12-19 19:26:29 +0200 | [diff] [blame] | 756 | 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] | 757 | tmp64 *= (long long)c->leb_size - c->leb_overhead; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 758 | tmp64 = ubifs_reported_space(c, tmp64); |
| 759 | c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | /** |
| 763 | * take_gc_lnum - reserve GC LEB. |
| 764 | * @c: UBIFS file-system description object |
| 765 | * |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 766 | * This function ensures that the LEB reserved for garbage collection is marked |
| 767 | * as "taken" in lprops. We also have to set free space to LEB size and dirty |
| 768 | * space to zero, because lprops may contain out-of-date information if the |
| 769 | * file-system was un-mounted before it has been committed. This function |
| 770 | * returns zero in case of success and a negative error code in case of |
| 771 | * failure. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 772 | */ |
| 773 | static int take_gc_lnum(struct ubifs_info *c) |
| 774 | { |
| 775 | int err; |
| 776 | |
| 777 | if (c->gc_lnum == -1) { |
| 778 | ubifs_err("no LEB for GC"); |
| 779 | return -EINVAL; |
| 780 | } |
| 781 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 782 | /* And we have to tell lprops that this LEB is taken */ |
| 783 | err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, |
| 784 | LPROPS_TAKEN, 0, 0); |
| 785 | return err; |
| 786 | } |
| 787 | |
| 788 | /** |
| 789 | * alloc_wbufs - allocate write-buffers. |
| 790 | * @c: UBIFS file-system description object |
| 791 | * |
| 792 | * This helper function allocates and initializes UBIFS write-buffers. Returns |
| 793 | * zero in case of success and %-ENOMEM in case of failure. |
| 794 | */ |
| 795 | static int alloc_wbufs(struct ubifs_info *c) |
| 796 | { |
| 797 | int i, err; |
| 798 | |
| 799 | c->jheads = kzalloc(c->jhead_cnt * sizeof(struct ubifs_jhead), |
| 800 | GFP_KERNEL); |
| 801 | if (!c->jheads) |
| 802 | return -ENOMEM; |
| 803 | |
| 804 | /* Initialize journal heads */ |
| 805 | for (i = 0; i < c->jhead_cnt; i++) { |
| 806 | INIT_LIST_HEAD(&c->jheads[i].buds_list); |
| 807 | err = ubifs_wbuf_init(c, &c->jheads[i].wbuf); |
| 808 | if (err) |
| 809 | return err; |
| 810 | |
| 811 | c->jheads[i].wbuf.sync_callback = &bud_wbuf_callback; |
| 812 | c->jheads[i].wbuf.jhead = i; |
Artem Bityutskiy | 1a0b069 | 2011-05-26 08:26:05 +0300 | [diff] [blame] | 813 | c->jheads[i].grouped = 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | c->jheads[BASEHD].wbuf.dtype = UBI_SHORTTERM; |
| 817 | /* |
| 818 | * Garbage Collector head likely contains long-term data and |
Artem Bityutskiy | 1a0b069 | 2011-05-26 08:26:05 +0300 | [diff] [blame] | 819 | * does not need to be synchronized by timer. Also GC head nodes are |
| 820 | * not grouped. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 821 | */ |
| 822 | c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM; |
Artem Bityutskiy | 0b335b9 | 2009-06-23 12:30:43 +0300 | [diff] [blame] | 823 | c->jheads[GCHD].wbuf.no_timer = 1; |
Artem Bityutskiy | 1a0b069 | 2011-05-26 08:26:05 +0300 | [diff] [blame] | 824 | c->jheads[GCHD].grouped = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 825 | |
| 826 | return 0; |
| 827 | } |
| 828 | |
| 829 | /** |
| 830 | * free_wbufs - free write-buffers. |
| 831 | * @c: UBIFS file-system description object |
| 832 | */ |
| 833 | static void free_wbufs(struct ubifs_info *c) |
| 834 | { |
| 835 | int i; |
| 836 | |
| 837 | if (c->jheads) { |
| 838 | for (i = 0; i < c->jhead_cnt; i++) { |
| 839 | kfree(c->jheads[i].wbuf.buf); |
| 840 | kfree(c->jheads[i].wbuf.inodes); |
| 841 | } |
| 842 | kfree(c->jheads); |
| 843 | c->jheads = NULL; |
| 844 | } |
| 845 | } |
| 846 | |
| 847 | /** |
| 848 | * free_orphans - free orphans. |
| 849 | * @c: UBIFS file-system description object |
| 850 | */ |
| 851 | static void free_orphans(struct ubifs_info *c) |
| 852 | { |
| 853 | struct ubifs_orphan *orph; |
| 854 | |
| 855 | while (c->orph_dnext) { |
| 856 | orph = c->orph_dnext; |
| 857 | c->orph_dnext = orph->dnext; |
| 858 | list_del(&orph->list); |
| 859 | kfree(orph); |
| 860 | } |
| 861 | |
| 862 | while (!list_empty(&c->orph_list)) { |
| 863 | orph = list_entry(c->orph_list.next, struct ubifs_orphan, list); |
| 864 | list_del(&orph->list); |
| 865 | kfree(orph); |
| 866 | dbg_err("orphan list not empty at unmount"); |
| 867 | } |
| 868 | |
| 869 | vfree(c->orph_buf); |
| 870 | c->orph_buf = NULL; |
| 871 | } |
| 872 | |
| 873 | /** |
| 874 | * free_buds - free per-bud objects. |
| 875 | * @c: UBIFS file-system description object |
| 876 | */ |
| 877 | static void free_buds(struct ubifs_info *c) |
| 878 | { |
| 879 | struct rb_node *this = c->buds.rb_node; |
| 880 | struct ubifs_bud *bud; |
| 881 | |
| 882 | while (this) { |
| 883 | if (this->rb_left) |
| 884 | this = this->rb_left; |
| 885 | else if (this->rb_right) |
| 886 | this = this->rb_right; |
| 887 | else { |
| 888 | bud = rb_entry(this, struct ubifs_bud, rb); |
| 889 | this = rb_parent(this); |
| 890 | if (this) { |
| 891 | if (this->rb_left == &bud->rb) |
| 892 | this->rb_left = NULL; |
| 893 | else |
| 894 | this->rb_right = NULL; |
| 895 | } |
| 896 | kfree(bud); |
| 897 | } |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | /** |
| 902 | * check_volume_empty - check if the UBI volume is empty. |
| 903 | * @c: UBIFS file-system description object |
| 904 | * |
| 905 | * This function checks if the UBIFS volume is empty by looking if its LEBs are |
| 906 | * mapped or not. The result of checking is stored in the @c->empty variable. |
| 907 | * Returns zero in case of success and a negative error code in case of |
| 908 | * failure. |
| 909 | */ |
| 910 | static int check_volume_empty(struct ubifs_info *c) |
| 911 | { |
| 912 | int lnum, err; |
| 913 | |
| 914 | c->empty = 1; |
| 915 | for (lnum = 0; lnum < c->leb_cnt; lnum++) { |
Artem Bityutskiy | d3b2578 | 2011-06-03 14:22:05 +0300 | [diff] [blame] | 916 | err = ubifs_is_mapped(c, lnum); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 917 | if (unlikely(err < 0)) |
| 918 | return err; |
| 919 | if (err == 1) { |
| 920 | c->empty = 0; |
| 921 | break; |
| 922 | } |
| 923 | |
| 924 | cond_resched(); |
| 925 | } |
| 926 | |
| 927 | return 0; |
| 928 | } |
| 929 | |
| 930 | /* |
| 931 | * UBIFS mount options. |
| 932 | * |
| 933 | * Opt_fast_unmount: do not run a journal commit before un-mounting |
| 934 | * Opt_norm_unmount: run a journal commit before un-mounting |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 935 | * Opt_bulk_read: enable bulk-reads |
| 936 | * Opt_no_bulk_read: disable bulk-reads |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 937 | * Opt_chk_data_crc: check CRCs when reading data nodes |
| 938 | * 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] | 939 | * Opt_override_compr: override default compressor |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 940 | * Opt_err: just end of array marker |
| 941 | */ |
| 942 | enum { |
| 943 | Opt_fast_unmount, |
| 944 | Opt_norm_unmount, |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 945 | Opt_bulk_read, |
| 946 | Opt_no_bulk_read, |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 947 | Opt_chk_data_crc, |
| 948 | Opt_no_chk_data_crc, |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 949 | Opt_override_compr, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 950 | Opt_err, |
| 951 | }; |
| 952 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 953 | static const match_table_t tokens = { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 954 | {Opt_fast_unmount, "fast_unmount"}, |
| 955 | {Opt_norm_unmount, "norm_unmount"}, |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 956 | {Opt_bulk_read, "bulk_read"}, |
| 957 | {Opt_no_bulk_read, "no_bulk_read"}, |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 958 | {Opt_chk_data_crc, "chk_data_crc"}, |
| 959 | {Opt_no_chk_data_crc, "no_chk_data_crc"}, |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 960 | {Opt_override_compr, "compr=%s"}, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 961 | {Opt_err, NULL}, |
| 962 | }; |
| 963 | |
| 964 | /** |
Artem Bityutskiy | 8379ea3 | 2009-05-29 12:34:52 +0300 | [diff] [blame] | 965 | * parse_standard_option - parse a standard mount option. |
| 966 | * @option: the option to parse |
| 967 | * |
| 968 | * Normally, standard mount options like "sync" are passed to file-systems as |
| 969 | * flags. However, when a "rootflags=" kernel boot parameter is used, they may |
| 970 | * be present in the options string. This function tries to deal with this |
| 971 | * situation and parse standard options. Returns 0 if the option was not |
| 972 | * recognized, and the corresponding integer flag if it was. |
| 973 | * |
| 974 | * UBIFS is only interested in the "sync" option, so do not check for anything |
| 975 | * else. |
| 976 | */ |
| 977 | static int parse_standard_option(const char *option) |
| 978 | { |
| 979 | ubifs_msg("parse %s", option); |
| 980 | if (!strcmp(option, "sync")) |
| 981 | return MS_SYNCHRONOUS; |
| 982 | return 0; |
| 983 | } |
| 984 | |
| 985 | /** |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 986 | * ubifs_parse_options - parse mount parameters. |
| 987 | * @c: UBIFS file-system description object |
| 988 | * @options: parameters to parse |
| 989 | * @is_remount: non-zero if this is FS re-mount |
| 990 | * |
| 991 | * This function parses UBIFS mount options and returns zero in case success |
| 992 | * and a negative error code in case of failure. |
| 993 | */ |
| 994 | static int ubifs_parse_options(struct ubifs_info *c, char *options, |
| 995 | int is_remount) |
| 996 | { |
| 997 | char *p; |
| 998 | substring_t args[MAX_OPT_ARGS]; |
| 999 | |
| 1000 | if (!options) |
| 1001 | return 0; |
| 1002 | |
| 1003 | while ((p = strsep(&options, ","))) { |
| 1004 | int token; |
| 1005 | |
| 1006 | if (!*p) |
| 1007 | continue; |
| 1008 | |
| 1009 | token = match_token(p, tokens, args); |
| 1010 | switch (token) { |
Artem Bityutskiy | 27ad279 | 2009-01-29 16:34:30 +0200 | [diff] [blame] | 1011 | /* |
| 1012 | * %Opt_fast_unmount and %Opt_norm_unmount options are ignored. |
Artem Bityutskiy | cb54ef8 | 2009-06-23 20:30:32 +0300 | [diff] [blame] | 1013 | * We accept them in order to be backward-compatible. But this |
Artem Bityutskiy | 27ad279 | 2009-01-29 16:34:30 +0200 | [diff] [blame] | 1014 | * should be removed at some point. |
| 1015 | */ |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1016 | case Opt_fast_unmount: |
| 1017 | c->mount_opts.unmount_mode = 2; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1018 | break; |
| 1019 | case Opt_norm_unmount: |
| 1020 | c->mount_opts.unmount_mode = 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1021 | break; |
Adrian Hunter | 4793e7c | 2008-09-02 16:29:46 +0300 | [diff] [blame] | 1022 | case Opt_bulk_read: |
| 1023 | c->mount_opts.bulk_read = 2; |
| 1024 | c->bulk_read = 1; |
| 1025 | break; |
| 1026 | case Opt_no_bulk_read: |
| 1027 | c->mount_opts.bulk_read = 1; |
| 1028 | c->bulk_read = 0; |
| 1029 | break; |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1030 | case Opt_chk_data_crc: |
| 1031 | c->mount_opts.chk_data_crc = 2; |
| 1032 | c->no_chk_data_crc = 0; |
| 1033 | break; |
| 1034 | case Opt_no_chk_data_crc: |
| 1035 | c->mount_opts.chk_data_crc = 1; |
| 1036 | c->no_chk_data_crc = 1; |
| 1037 | break; |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1038 | case Opt_override_compr: |
| 1039 | { |
| 1040 | char *name = match_strdup(&args[0]); |
| 1041 | |
| 1042 | if (!name) |
| 1043 | return -ENOMEM; |
| 1044 | if (!strcmp(name, "none")) |
| 1045 | c->mount_opts.compr_type = UBIFS_COMPR_NONE; |
| 1046 | else if (!strcmp(name, "lzo")) |
| 1047 | c->mount_opts.compr_type = UBIFS_COMPR_LZO; |
| 1048 | else if (!strcmp(name, "zlib")) |
| 1049 | c->mount_opts.compr_type = UBIFS_COMPR_ZLIB; |
| 1050 | else { |
| 1051 | ubifs_err("unknown compressor \"%s\"", name); |
| 1052 | kfree(name); |
| 1053 | return -EINVAL; |
| 1054 | } |
| 1055 | kfree(name); |
| 1056 | c->mount_opts.override_compr = 1; |
| 1057 | c->default_compr = c->mount_opts.compr_type; |
| 1058 | break; |
| 1059 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1060 | default: |
Artem Bityutskiy | 8379ea3 | 2009-05-29 12:34:52 +0300 | [diff] [blame] | 1061 | { |
| 1062 | unsigned long flag; |
| 1063 | struct super_block *sb = c->vfs_sb; |
| 1064 | |
| 1065 | flag = parse_standard_option(p); |
| 1066 | if (!flag) { |
| 1067 | ubifs_err("unrecognized mount option \"%s\" " |
| 1068 | "or missing value", p); |
| 1069 | return -EINVAL; |
| 1070 | } |
| 1071 | sb->s_flags |= flag; |
| 1072 | break; |
| 1073 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | return 0; |
| 1078 | } |
| 1079 | |
| 1080 | /** |
| 1081 | * destroy_journal - destroy journal data structures. |
| 1082 | * @c: UBIFS file-system description object |
| 1083 | * |
| 1084 | * This function destroys journal data structures including those that may have |
| 1085 | * been created by recovery functions. |
| 1086 | */ |
| 1087 | static void destroy_journal(struct ubifs_info *c) |
| 1088 | { |
| 1089 | while (!list_empty(&c->unclean_leb_list)) { |
| 1090 | struct ubifs_unclean_leb *ucleb; |
| 1091 | |
| 1092 | ucleb = list_entry(c->unclean_leb_list.next, |
| 1093 | struct ubifs_unclean_leb, list); |
| 1094 | list_del(&ucleb->list); |
| 1095 | kfree(ucleb); |
| 1096 | } |
| 1097 | while (!list_empty(&c->old_buds)) { |
| 1098 | struct ubifs_bud *bud; |
| 1099 | |
| 1100 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); |
| 1101 | list_del(&bud->list); |
| 1102 | kfree(bud); |
| 1103 | } |
| 1104 | ubifs_destroy_idx_gc(c); |
| 1105 | ubifs_destroy_size_tree(c); |
| 1106 | ubifs_tnc_close(c); |
| 1107 | free_buds(c); |
| 1108 | } |
| 1109 | |
| 1110 | /** |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1111 | * bu_init - initialize bulk-read information. |
| 1112 | * @c: UBIFS file-system description object |
| 1113 | */ |
| 1114 | static void bu_init(struct ubifs_info *c) |
| 1115 | { |
| 1116 | ubifs_assert(c->bulk_read == 1); |
| 1117 | |
| 1118 | if (c->bu.buf) |
| 1119 | return; /* Already initialized */ |
| 1120 | |
| 1121 | again: |
| 1122 | c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN); |
| 1123 | if (!c->bu.buf) { |
| 1124 | if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) { |
| 1125 | c->max_bu_buf_len = UBIFS_KMALLOC_OK; |
| 1126 | goto again; |
| 1127 | } |
| 1128 | |
| 1129 | /* Just disable bulk-read */ |
| 1130 | ubifs_warn("Cannot allocate %d bytes of memory for bulk-read, " |
| 1131 | "disabling it", c->max_bu_buf_len); |
| 1132 | c->mount_opts.bulk_read = 1; |
| 1133 | c->bulk_read = 0; |
| 1134 | return; |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | /** |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1139 | * check_free_space - check if there is enough free space to mount. |
| 1140 | * @c: UBIFS file-system description object |
| 1141 | * |
| 1142 | * This function makes sure UBIFS has enough free space to be mounted in |
| 1143 | * read/write mode. UBIFS must always have some free space to allow deletions. |
| 1144 | */ |
| 1145 | static int check_free_space(struct ubifs_info *c) |
| 1146 | { |
| 1147 | ubifs_assert(c->dark_wm > 0); |
| 1148 | if (c->lst.total_free + c->lst.total_dirty < c->dark_wm) { |
Artem Bityutskiy | c436157 | 2011-03-25 15:27:40 +0200 | [diff] [blame] | 1149 | ubifs_err("insufficient free space to mount in R/W mode"); |
Artem Bityutskiy | f1bd66a | 2011-03-29 18:36:21 +0300 | [diff] [blame] | 1150 | dbg_dump_budg(c, &c->bi); |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1151 | dbg_dump_lprops(c); |
Artem Bityutskiy | a2b9df3 | 2009-01-29 16:22:54 +0200 | [diff] [blame] | 1152 | return -ENOSPC; |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1153 | } |
| 1154 | return 0; |
| 1155 | } |
| 1156 | |
| 1157 | /** |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1158 | * mount_ubifs - mount UBIFS file-system. |
| 1159 | * @c: UBIFS file-system description object |
| 1160 | * |
| 1161 | * This function mounts UBIFS file system. Returns zero in case of success and |
| 1162 | * a negative error code in case of failure. |
| 1163 | * |
| 1164 | * Note, the function does not de-allocate resources it it fails half way |
| 1165 | * through, and the caller has to do this instead. |
| 1166 | */ |
| 1167 | static int mount_ubifs(struct ubifs_info *c) |
| 1168 | { |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1169 | int err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1170 | long long x; |
| 1171 | size_t sz; |
| 1172 | |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1173 | c->ro_mount = !!(c->vfs_sb->s_flags & MS_RDONLY); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1174 | err = init_constants_early(c); |
| 1175 | if (err) |
| 1176 | return err; |
| 1177 | |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1178 | err = ubifs_debugging_init(c); |
| 1179 | if (err) |
| 1180 | return err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1181 | |
| 1182 | err = check_volume_empty(c); |
| 1183 | if (err) |
| 1184 | goto out_free; |
| 1185 | |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1186 | if (c->empty && (c->ro_mount || c->ro_media)) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1187 | /* |
| 1188 | * This UBI volume is empty, and read-only, or the file system |
| 1189 | * is mounted read-only - we cannot format it. |
| 1190 | */ |
| 1191 | ubifs_err("can't format empty UBI volume: read-only %s", |
| 1192 | c->ro_media ? "UBI volume" : "mount"); |
| 1193 | err = -EROFS; |
| 1194 | goto out_free; |
| 1195 | } |
| 1196 | |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1197 | if (c->ro_media && !c->ro_mount) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1198 | ubifs_err("cannot mount read-write - read-only media"); |
| 1199 | err = -EROFS; |
| 1200 | goto out_free; |
| 1201 | } |
| 1202 | |
| 1203 | /* |
| 1204 | * The requirement for the buffer is that it should fit indexing B-tree |
| 1205 | * height amount of integers. We assume the height if the TNC tree will |
| 1206 | * never exceed 64. |
| 1207 | */ |
| 1208 | err = -ENOMEM; |
| 1209 | c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL); |
| 1210 | if (!c->bottom_up_buf) |
| 1211 | goto out_free; |
| 1212 | |
| 1213 | c->sbuf = vmalloc(c->leb_size); |
| 1214 | if (!c->sbuf) |
| 1215 | goto out_free; |
| 1216 | |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1217 | if (!c->ro_mount) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1218 | c->ileb_buf = vmalloc(c->leb_size); |
| 1219 | if (!c->ileb_buf) |
| 1220 | goto out_free; |
| 1221 | } |
| 1222 | |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1223 | if (c->bulk_read == 1) |
| 1224 | bu_init(c); |
| 1225 | |
Matthew L. Creech | d882962 | 2011-03-04 17:55:02 -0500 | [diff] [blame] | 1226 | if (!c->ro_mount) { |
| 1227 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, |
| 1228 | GFP_KERNEL); |
| 1229 | if (!c->write_reserve_buf) |
| 1230 | goto out_free; |
| 1231 | } |
| 1232 | |
Artem Bityutskiy | 18d1d7f | 2011-01-17 22:27:56 +0200 | [diff] [blame] | 1233 | c->mounting = 1; |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1234 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1235 | err = ubifs_read_superblock(c); |
| 1236 | if (err) |
| 1237 | goto out_free; |
| 1238 | |
| 1239 | /* |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1240 | * Make sure the compressor which is set as default in the superblock |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1241 | * or overridden by mount options is actually compiled in. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1242 | */ |
| 1243 | if (!ubifs_compr_present(c->default_compr)) { |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1244 | ubifs_err("'compressor \"%s\" is not compiled in", |
| 1245 | ubifs_compr_name(c->default_compr)); |
Corentin Chary | 8eec2f3 | 2009-05-25 08:49:10 +0200 | [diff] [blame] | 1246 | err = -ENOTSUPP; |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 1247 | goto out_free; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1248 | } |
| 1249 | |
Artem Bityutskiy | 79807d0 | 2008-12-27 19:18:00 +0200 | [diff] [blame] | 1250 | err = init_constants_sb(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1251 | if (err) |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1252 | goto out_free; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1253 | |
| 1254 | sz = ALIGN(c->max_idx_node_sz, c->min_io_size); |
| 1255 | sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); |
| 1256 | c->cbuf = kmalloc(sz, GFP_NOFS); |
| 1257 | if (!c->cbuf) { |
| 1258 | err = -ENOMEM; |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1259 | goto out_free; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1260 | } |
| 1261 | |
Artem Bityutskiy | b50b9f4 | 2011-04-25 18:17:09 +0300 | [diff] [blame] | 1262 | err = alloc_wbufs(c); |
| 1263 | if (err) |
| 1264 | goto out_cbuf; |
| 1265 | |
Sebastian Siewior | 0855f31 | 2008-09-09 11:17:29 +0200 | [diff] [blame] | 1266 | sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1267 | if (!c->ro_mount) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1268 | /* Create background thread */ |
Hunter Adrian | fcabb34 | 2009-03-18 12:29:39 +0100 | [diff] [blame] | 1269 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1270 | if (IS_ERR(c->bgt)) { |
| 1271 | err = PTR_ERR(c->bgt); |
| 1272 | c->bgt = NULL; |
| 1273 | ubifs_err("cannot spawn \"%s\", error %d", |
| 1274 | c->bgt_name, err); |
| 1275 | goto out_wbufs; |
| 1276 | } |
| 1277 | wake_up_process(c->bgt); |
| 1278 | } |
| 1279 | |
| 1280 | err = ubifs_read_master(c); |
| 1281 | if (err) |
| 1282 | goto out_master; |
| 1283 | |
Ben Gardiner | 0980119 | 2011-05-30 14:56:16 -0400 | [diff] [blame] | 1284 | init_constants_master(c); |
| 1285 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1286 | if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { |
| 1287 | ubifs_msg("recovery needed"); |
| 1288 | c->need_recovery = 1; |
Ben Gardiner | 781c571 | 2011-05-30 14:56:15 -0400 | [diff] [blame] | 1289 | } |
| 1290 | |
Ben Gardiner | 781c571 | 2011-05-30 14:56:15 -0400 | [diff] [blame] | 1291 | if (c->need_recovery && !c->ro_mount) { |
| 1292 | err = ubifs_recover_inl_heads(c, c->sbuf); |
| 1293 | if (err) |
| 1294 | goto out_master; |
| 1295 | } |
| 1296 | |
| 1297 | err = ubifs_lpt_init(c, 1, !c->ro_mount); |
| 1298 | if (err) |
| 1299 | goto out_master; |
| 1300 | |
Ben Gardiner | 0980119 | 2011-05-30 14:56:16 -0400 | [diff] [blame] | 1301 | if (!c->ro_mount && c->space_fixup) { |
| 1302 | err = ubifs_fixup_free_space(c); |
| 1303 | if (err) |
| 1304 | goto out_master; |
| 1305 | } |
| 1306 | |
Ben Gardiner | 781c571 | 2011-05-30 14:56:15 -0400 | [diff] [blame] | 1307 | if (!c->ro_mount) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1308 | /* |
| 1309 | * Set the "dirty" flag so that if we reboot uncleanly we |
| 1310 | * will notice this immediately on the next mount. |
| 1311 | */ |
| 1312 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); |
| 1313 | err = ubifs_write_master(c); |
| 1314 | if (err) |
Ben Gardiner | 781c571 | 2011-05-30 14:56:15 -0400 | [diff] [blame] | 1315 | goto out_lpt; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1316 | } |
| 1317 | |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 1318 | err = dbg_check_idx_size(c, c->bi.old_idx_sz); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1319 | if (err) |
| 1320 | goto out_lpt; |
| 1321 | |
| 1322 | err = ubifs_replay_journal(c); |
| 1323 | if (err) |
| 1324 | goto out_journal; |
| 1325 | |
Artem Bityutskiy | 1fb8bd0 | 2009-06-28 18:31:58 +0300 | [diff] [blame] | 1326 | /* Calculate 'min_idx_lebs' after journal replay */ |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 1327 | c->bi.min_idx_lebs = ubifs_calc_min_idx_lebs(c); |
Artem Bityutskiy | 1fb8bd0 | 2009-06-28 18:31:58 +0300 | [diff] [blame] | 1328 | |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1329 | err = ubifs_mount_orphans(c, c->need_recovery, c->ro_mount); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1330 | if (err) |
| 1331 | goto out_orphans; |
| 1332 | |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1333 | if (!c->ro_mount) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1334 | int lnum; |
| 1335 | |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1336 | err = check_free_space(c); |
| 1337 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1338 | goto out_orphans; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1339 | |
| 1340 | /* Check for enough log space */ |
| 1341 | lnum = c->lhead_lnum + 1; |
| 1342 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) |
| 1343 | lnum = UBIFS_LOG_LNUM; |
| 1344 | if (lnum == c->ltail_lnum) { |
| 1345 | err = ubifs_consolidate_log(c); |
| 1346 | if (err) |
| 1347 | goto out_orphans; |
| 1348 | } |
| 1349 | |
| 1350 | if (c->need_recovery) { |
| 1351 | err = ubifs_recover_size(c); |
| 1352 | if (err) |
| 1353 | goto out_orphans; |
| 1354 | err = ubifs_rcvry_gc_commit(c); |
Artem Bityutskiy | 276de5d | 2010-05-23 14:16:13 +0300 | [diff] [blame] | 1355 | if (err) |
| 1356 | goto out_orphans; |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1357 | } else { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1358 | err = take_gc_lnum(c); |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1359 | if (err) |
| 1360 | goto out_orphans; |
| 1361 | |
| 1362 | /* |
| 1363 | * GC LEB may contain garbage if there was an unclean |
| 1364 | * reboot, and it should be un-mapped. |
| 1365 | */ |
| 1366 | err = ubifs_leb_unmap(c, c->gc_lnum); |
| 1367 | if (err) |
Matthieu CASTET | c18de72 | 2010-08-02 11:36:06 +0200 | [diff] [blame] | 1368 | goto out_orphans; |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1369 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1370 | |
| 1371 | err = dbg_check_lprops(c); |
| 1372 | if (err) |
| 1373 | goto out_orphans; |
| 1374 | } else if (c->need_recovery) { |
| 1375 | err = ubifs_recover_size(c); |
| 1376 | if (err) |
| 1377 | goto out_orphans; |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1378 | } else { |
| 1379 | /* |
| 1380 | * Even if we mount read-only, we have to set space in GC LEB |
| 1381 | * to proper value because this affects UBIFS free space |
| 1382 | * reporting. We do not want to have a situation when |
| 1383 | * re-mounting from R/O to R/W changes amount of free space. |
| 1384 | */ |
| 1385 | err = take_gc_lnum(c); |
| 1386 | if (err) |
| 1387 | goto out_orphans; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1388 | } |
| 1389 | |
| 1390 | spin_lock(&ubifs_infos_lock); |
| 1391 | list_add_tail(&c->infos_list, &ubifs_infos); |
| 1392 | spin_unlock(&ubifs_infos_lock); |
| 1393 | |
| 1394 | if (c->need_recovery) { |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1395 | if (c->ro_mount) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1396 | ubifs_msg("recovery deferred"); |
| 1397 | else { |
| 1398 | c->need_recovery = 0; |
| 1399 | ubifs_msg("recovery completed"); |
Artem Bityutskiy | b221337 | 2009-03-15 17:20:22 +0200 | [diff] [blame] | 1400 | /* |
| 1401 | * GC LEB has to be empty and taken at this point. But |
| 1402 | * the journal head LEBs may also be accounted as |
| 1403 | * "empty taken" if they are empty. |
| 1404 | */ |
| 1405 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1406 | } |
Artem Bityutskiy | 6ba87c9 | 2009-01-26 16:12:20 +0200 | [diff] [blame] | 1407 | } else |
Artem Bityutskiy | b221337 | 2009-03-15 17:20:22 +0200 | [diff] [blame] | 1408 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 1409 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1410 | err = dbg_check_filesystem(c); |
| 1411 | if (err) |
| 1412 | goto out_infos; |
| 1413 | |
Artem Bityutskiy | 6ba87c9 | 2009-01-26 16:12:20 +0200 | [diff] [blame] | 1414 | err = dbg_debugfs_init_fs(c); |
| 1415 | if (err) |
| 1416 | goto out_infos; |
| 1417 | |
Artem Bityutskiy | 18d1d7f | 2011-01-17 22:27:56 +0200 | [diff] [blame] | 1418 | c->mounting = 0; |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1419 | |
Artem Bityutskiy | ce769ca | 2008-07-18 12:54:21 +0300 | [diff] [blame] | 1420 | ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", |
| 1421 | c->vi.ubi_num, c->vi.vol_id, c->vi.name); |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1422 | if (c->ro_mount) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1423 | ubifs_msg("mounted read-only"); |
| 1424 | x = (long long)c->main_lebs * c->leb_size; |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1425 | ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d " |
| 1426 | "LEBs)", x, x >> 10, x >> 20, c->main_lebs); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1427 | 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] | 1428 | ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d " |
| 1429 | "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] | 1430 | ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)", |
| 1431 | c->fmt_version, c->ro_compat_version, |
| 1432 | UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1433 | ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr)); |
Artem Bityutskiy | fae7fb2 | 2008-10-17 18:49:23 +0300 | [diff] [blame] | 1434 | ubifs_msg("reserved for root: %llu bytes (%llu KiB)", |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1435 | c->report_rp_size, c->report_rp_size >> 10); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1436 | |
| 1437 | dbg_msg("compiled on: " __DATE__ " at " __TIME__); |
| 1438 | dbg_msg("min. I/O unit size: %d bytes", c->min_io_size); |
Artem Bityutskiy | 3e8e2e0 | 2011-01-30 18:58:32 +0200 | [diff] [blame] | 1439 | dbg_msg("max. write size: %d bytes", c->max_write_size); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1440 | dbg_msg("LEB size: %d bytes (%d KiB)", |
Artem Bityutskiy | 948cfb2 | 2008-08-20 11:56:33 +0300 | [diff] [blame] | 1441 | c->leb_size, c->leb_size >> 10); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1442 | dbg_msg("data journal heads: %d", |
| 1443 | c->jhead_cnt - NONDATA_JHEADS_CNT); |
Joe Perches | 7f2f4e7 | 2009-12-14 18:01:13 -0800 | [diff] [blame] | 1444 | dbg_msg("UUID: %pUB", c->uuid); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1445 | dbg_msg("big_lpt %d", c->big_lpt); |
| 1446 | dbg_msg("log LEBs: %d (%d - %d)", |
| 1447 | c->log_lebs, UBIFS_LOG_LNUM, c->log_last); |
| 1448 | dbg_msg("LPT area LEBs: %d (%d - %d)", |
| 1449 | c->lpt_lebs, c->lpt_first, c->lpt_last); |
| 1450 | dbg_msg("orphan area LEBs: %d (%d - %d)", |
| 1451 | c->orph_lebs, c->orph_first, c->orph_last); |
| 1452 | dbg_msg("main area LEBs: %d (%d - %d)", |
| 1453 | c->main_lebs, c->main_first, c->leb_cnt - 1); |
| 1454 | dbg_msg("index LEBs: %d", c->lst.idx_lebs); |
| 1455 | dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)", |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 1456 | c->bi.old_idx_sz, c->bi.old_idx_sz >> 10, |
| 1457 | c->bi.old_idx_sz >> 20); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1458 | dbg_msg("key hash type: %d", c->key_hash_type); |
| 1459 | dbg_msg("tree fanout: %d", c->fanout); |
| 1460 | dbg_msg("reserved GC LEB: %d", c->gc_lnum); |
| 1461 | dbg_msg("first main LEB: %d", c->main_first); |
Artem Bityutskiy | 8e5033a | 2008-12-30 18:37:45 +0200 | [diff] [blame] | 1462 | dbg_msg("max. znode size %d", c->max_znode_sz); |
| 1463 | dbg_msg("max. index node size %d", c->max_idx_node_sz); |
| 1464 | dbg_msg("node sizes: data %zu, inode %zu, dentry %zu", |
| 1465 | UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); |
| 1466 | dbg_msg("node sizes: trun %zu, sb %zu, master %zu", |
| 1467 | UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); |
| 1468 | dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu", |
| 1469 | UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); |
Artem Bityutskiy | 6342aae | 2011-03-08 14:26:47 +0200 | [diff] [blame] | 1470 | dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu, idx %d", |
Artem Bityutskiy | c436157 | 2011-03-25 15:27:40 +0200 | [diff] [blame] | 1471 | UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, |
Artem Bityutskiy | 6342aae | 2011-03-08 14:26:47 +0200 | [diff] [blame] | 1472 | UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout)); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1473 | dbg_msg("dead watermark: %d", c->dead_wm); |
| 1474 | dbg_msg("dark watermark: %d", c->dark_wm); |
Artem Bityutskiy | 8e5033a | 2008-12-30 18:37:45 +0200 | [diff] [blame] | 1475 | dbg_msg("LEB overhead: %d", c->leb_overhead); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1476 | x = (long long)c->main_lebs * c->dark_wm; |
| 1477 | dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)", |
| 1478 | x, x >> 10, x >> 20); |
| 1479 | dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)", |
| 1480 | c->max_bud_bytes, c->max_bud_bytes >> 10, |
| 1481 | c->max_bud_bytes >> 20); |
| 1482 | dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", |
| 1483 | c->bg_bud_bytes, c->bg_bud_bytes >> 10, |
| 1484 | c->bg_bud_bytes >> 20); |
| 1485 | dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)", |
| 1486 | c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); |
| 1487 | dbg_msg("max. seq. number: %llu", c->max_sqnum); |
| 1488 | dbg_msg("commit number: %llu", c->cmt_no); |
| 1489 | |
| 1490 | return 0; |
| 1491 | |
| 1492 | out_infos: |
| 1493 | spin_lock(&ubifs_infos_lock); |
| 1494 | list_del(&c->infos_list); |
| 1495 | spin_unlock(&ubifs_infos_lock); |
| 1496 | out_orphans: |
| 1497 | free_orphans(c); |
| 1498 | out_journal: |
| 1499 | destroy_journal(c); |
| 1500 | out_lpt: |
| 1501 | ubifs_lpt_free(c, 0); |
| 1502 | out_master: |
| 1503 | kfree(c->mst_node); |
| 1504 | kfree(c->rcvrd_mst_node); |
| 1505 | if (c->bgt) |
| 1506 | kthread_stop(c->bgt); |
| 1507 | out_wbufs: |
| 1508 | free_wbufs(c); |
| 1509 | out_cbuf: |
| 1510 | kfree(c->cbuf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1511 | out_free: |
Matthew L. Creech | d882962 | 2011-03-04 17:55:02 -0500 | [diff] [blame] | 1512 | kfree(c->write_reserve_buf); |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1513 | kfree(c->bu.buf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1514 | vfree(c->ileb_buf); |
| 1515 | vfree(c->sbuf); |
| 1516 | kfree(c->bottom_up_buf); |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1517 | ubifs_debugging_exit(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1518 | return err; |
| 1519 | } |
| 1520 | |
| 1521 | /** |
| 1522 | * ubifs_umount - un-mount UBIFS file-system. |
| 1523 | * @c: UBIFS file-system description object |
| 1524 | * |
| 1525 | * Note, this function is called to free allocated resourced when un-mounting, |
| 1526 | * as well as free resources when an error occurred while we were half way |
| 1527 | * through mounting (error path cleanup function). So it has to make sure the |
| 1528 | * resource was actually allocated before freeing it. |
| 1529 | */ |
| 1530 | static void ubifs_umount(struct ubifs_info *c) |
| 1531 | { |
| 1532 | dbg_gen("un-mounting UBI device %d, volume %d", c->vi.ubi_num, |
| 1533 | c->vi.vol_id); |
| 1534 | |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 1535 | dbg_debugfs_exit_fs(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1536 | spin_lock(&ubifs_infos_lock); |
| 1537 | list_del(&c->infos_list); |
| 1538 | spin_unlock(&ubifs_infos_lock); |
| 1539 | |
| 1540 | if (c->bgt) |
| 1541 | kthread_stop(c->bgt); |
| 1542 | |
| 1543 | destroy_journal(c); |
| 1544 | free_wbufs(c); |
| 1545 | free_orphans(c); |
| 1546 | ubifs_lpt_free(c, 0); |
| 1547 | |
| 1548 | kfree(c->cbuf); |
| 1549 | kfree(c->rcvrd_mst_node); |
| 1550 | kfree(c->mst_node); |
Matthew L. Creech | d882962 | 2011-03-04 17:55:02 -0500 | [diff] [blame] | 1551 | kfree(c->write_reserve_buf); |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1552 | kfree(c->bu.buf); |
| 1553 | vfree(c->ileb_buf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1554 | vfree(c->sbuf); |
| 1555 | kfree(c->bottom_up_buf); |
Artem Bityutskiy | 17c2f9f | 2008-10-17 13:31:39 +0300 | [diff] [blame] | 1556 | ubifs_debugging_exit(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1557 | } |
| 1558 | |
| 1559 | /** |
| 1560 | * ubifs_remount_rw - re-mount in read-write mode. |
| 1561 | * @c: UBIFS file-system description object |
| 1562 | * |
| 1563 | * UBIFS avoids allocating many unnecessary resources when mounted in read-only |
| 1564 | * mode. This function allocates the needed resources and re-mounts UBIFS in |
| 1565 | * read-write mode. |
| 1566 | */ |
| 1567 | static int ubifs_remount_rw(struct ubifs_info *c) |
| 1568 | { |
| 1569 | int err, lnum; |
| 1570 | |
Artem Bityutskiy | 963f0cf | 2009-03-26 12:51:21 +0200 | [diff] [blame] | 1571 | if (c->rw_incompat) { |
| 1572 | ubifs_err("the file-system is not R/W-compatible"); |
| 1573 | ubifs_msg("on-flash format version is w%d/r%d, but software " |
| 1574 | "only supports up to version w%d/r%d", c->fmt_version, |
| 1575 | c->ro_compat_version, UBIFS_FORMAT_VERSION, |
| 1576 | UBIFS_RO_COMPAT_VERSION); |
| 1577 | return -EROFS; |
| 1578 | } |
| 1579 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1580 | mutex_lock(&c->umount_mutex); |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1581 | dbg_save_space_info(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1582 | c->remounting_rw = 1; |
Artem Bityutskiy | c88ac00 | 2011-03-29 09:45:21 +0300 | [diff] [blame] | 1583 | c->ro_mount = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1584 | |
Artem Bityutskiy | 57a450e | 2008-12-30 16:23:34 +0200 | [diff] [blame] | 1585 | err = check_free_space(c); |
| 1586 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1587 | goto out; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1588 | |
| 1589 | if (c->old_leb_cnt != c->leb_cnt) { |
| 1590 | struct ubifs_sb_node *sup; |
| 1591 | |
| 1592 | sup = ubifs_read_sb_node(c); |
| 1593 | if (IS_ERR(sup)) { |
| 1594 | err = PTR_ERR(sup); |
| 1595 | goto out; |
| 1596 | } |
| 1597 | sup->leb_cnt = cpu_to_le32(c->leb_cnt); |
| 1598 | err = ubifs_write_sb_node(c, sup); |
Artem Bityutskiy | eaeee24 | 2011-05-06 17:08:56 +0300 | [diff] [blame] | 1599 | kfree(sup); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1600 | if (err) |
| 1601 | goto out; |
| 1602 | } |
| 1603 | |
| 1604 | if (c->need_recovery) { |
| 1605 | ubifs_msg("completing deferred recovery"); |
| 1606 | err = ubifs_write_rcvrd_mst_node(c); |
| 1607 | if (err) |
| 1608 | goto out; |
| 1609 | err = ubifs_recover_size(c); |
| 1610 | if (err) |
| 1611 | goto out; |
| 1612 | err = ubifs_clean_lebs(c, c->sbuf); |
| 1613 | if (err) |
| 1614 | goto out; |
| 1615 | err = ubifs_recover_inl_heads(c, c->sbuf); |
| 1616 | if (err) |
| 1617 | goto out; |
Adrian Hunter | 49d128a | 2009-01-26 10:55:40 +0200 | [diff] [blame] | 1618 | } else { |
| 1619 | /* A readonly mount is not allowed to have orphans */ |
| 1620 | ubifs_assert(c->tot_orphans == 0); |
| 1621 | err = ubifs_clear_orphans(c); |
| 1622 | if (err) |
| 1623 | goto out; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1624 | } |
| 1625 | |
| 1626 | if (!(c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY))) { |
| 1627 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_DIRTY); |
| 1628 | err = ubifs_write_master(c); |
| 1629 | if (err) |
| 1630 | goto out; |
| 1631 | } |
| 1632 | |
| 1633 | c->ileb_buf = vmalloc(c->leb_size); |
| 1634 | if (!c->ileb_buf) { |
| 1635 | err = -ENOMEM; |
| 1636 | goto out; |
| 1637 | } |
| 1638 | |
Matthew L. Creech | d882962 | 2011-03-04 17:55:02 -0500 | [diff] [blame] | 1639 | c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL); |
| 1640 | if (!c->write_reserve_buf) |
| 1641 | goto out; |
| 1642 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1643 | err = ubifs_lpt_init(c, 0, 1); |
| 1644 | if (err) |
| 1645 | goto out; |
| 1646 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1647 | /* Create background thread */ |
Hunter Adrian | fcabb34 | 2009-03-18 12:29:39 +0100 | [diff] [blame] | 1648 | c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1649 | if (IS_ERR(c->bgt)) { |
| 1650 | err = PTR_ERR(c->bgt); |
| 1651 | c->bgt = NULL; |
| 1652 | ubifs_err("cannot spawn \"%s\", error %d", |
| 1653 | c->bgt_name, err); |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1654 | goto out; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1655 | } |
| 1656 | wake_up_process(c->bgt); |
| 1657 | |
| 1658 | c->orph_buf = vmalloc(c->leb_size); |
Adrian Hunter | 2953e73 | 2008-09-04 16:26:00 +0300 | [diff] [blame] | 1659 | if (!c->orph_buf) { |
| 1660 | err = -ENOMEM; |
| 1661 | goto out; |
| 1662 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1663 | |
| 1664 | /* Check for enough log space */ |
| 1665 | lnum = c->lhead_lnum + 1; |
| 1666 | if (lnum >= UBIFS_LOG_LNUM + c->log_lebs) |
| 1667 | lnum = UBIFS_LOG_LNUM; |
| 1668 | if (lnum == c->ltail_lnum) { |
| 1669 | err = ubifs_consolidate_log(c); |
| 1670 | if (err) |
| 1671 | goto out; |
| 1672 | } |
| 1673 | |
| 1674 | if (c->need_recovery) |
| 1675 | err = ubifs_rcvry_gc_commit(c); |
| 1676 | else |
Artem Bityutskiy | b4978e9 | 2009-01-23 18:23:03 +0200 | [diff] [blame] | 1677 | err = ubifs_leb_unmap(c, c->gc_lnum); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1678 | if (err) |
| 1679 | goto out; |
| 1680 | |
Artem Bityutskiy | 8c230d9 | 2011-04-20 18:02:45 +0300 | [diff] [blame] | 1681 | dbg_gen("re-mounted read-write"); |
| 1682 | c->remounting_rw = 0; |
| 1683 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1684 | if (c->need_recovery) { |
| 1685 | c->need_recovery = 0; |
| 1686 | ubifs_msg("deferred recovery completed"); |
Artem Bityutskiy | 8c230d9 | 2011-04-20 18:02:45 +0300 | [diff] [blame] | 1687 | } else { |
| 1688 | /* |
| 1689 | * Do not run the debugging space check if the were doing |
| 1690 | * recovery, because when we saved the information we had the |
| 1691 | * file-system in a state where the TNC and lprops has been |
| 1692 | * modified in memory, but all the I/O operations (including a |
| 1693 | * commit) were deferred. So the file-system was in |
| 1694 | * "non-committed" state. Now the file-system is in committed |
| 1695 | * state, and of course the amount of free space will change |
| 1696 | * because, for example, the old index size was imprecise. |
| 1697 | */ |
| 1698 | err = dbg_check_space_info(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1699 | } |
Matthew L. Creech | 9d510db | 2011-05-06 18:58:23 -0400 | [diff] [blame] | 1700 | |
| 1701 | if (c->space_fixup) { |
| 1702 | err = ubifs_fixup_free_space(c); |
| 1703 | if (err) |
| 1704 | goto out; |
| 1705 | } |
| 1706 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1707 | mutex_unlock(&c->umount_mutex); |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1708 | return err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1709 | |
| 1710 | out: |
Artem Bityutskiy | c88ac00 | 2011-03-29 09:45:21 +0300 | [diff] [blame] | 1711 | c->ro_mount = 1; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1712 | vfree(c->orph_buf); |
| 1713 | c->orph_buf = NULL; |
| 1714 | if (c->bgt) { |
| 1715 | kthread_stop(c->bgt); |
| 1716 | c->bgt = NULL; |
| 1717 | } |
| 1718 | free_wbufs(c); |
Matthew L. Creech | d882962 | 2011-03-04 17:55:02 -0500 | [diff] [blame] | 1719 | kfree(c->write_reserve_buf); |
| 1720 | c->write_reserve_buf = NULL; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1721 | vfree(c->ileb_buf); |
| 1722 | c->ileb_buf = NULL; |
| 1723 | ubifs_lpt_free(c, 1); |
| 1724 | c->remounting_rw = 0; |
| 1725 | mutex_unlock(&c->umount_mutex); |
| 1726 | return err; |
| 1727 | } |
| 1728 | |
| 1729 | /** |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1730 | * ubifs_remount_ro - re-mount in read-only mode. |
| 1731 | * @c: UBIFS file-system description object |
| 1732 | * |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1733 | * We assume VFS has stopped writing. Possibly the background thread could be |
| 1734 | * running a commit, however kthread_stop will wait in that case. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1735 | */ |
| 1736 | static void ubifs_remount_ro(struct ubifs_info *c) |
| 1737 | { |
| 1738 | int i, err; |
| 1739 | |
| 1740 | ubifs_assert(!c->need_recovery); |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1741 | ubifs_assert(!c->ro_mount); |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1742 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1743 | mutex_lock(&c->umount_mutex); |
| 1744 | if (c->bgt) { |
| 1745 | kthread_stop(c->bgt); |
| 1746 | c->bgt = NULL; |
| 1747 | } |
| 1748 | |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1749 | dbg_save_space_info(c); |
| 1750 | |
Artem Bityutskiy | 3903755 | 2010-10-18 08:28:50 +0300 | [diff] [blame] | 1751 | for (i = 0; i < c->jhead_cnt; i++) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1752 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1753 | |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1754 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
| 1755 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); |
| 1756 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); |
| 1757 | err = ubifs_write_master(c); |
| 1758 | if (err) |
| 1759 | ubifs_ro_mode(c, err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1760 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1761 | vfree(c->orph_buf); |
| 1762 | c->orph_buf = NULL; |
Matthew L. Creech | d882962 | 2011-03-04 17:55:02 -0500 | [diff] [blame] | 1763 | kfree(c->write_reserve_buf); |
| 1764 | c->write_reserve_buf = NULL; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1765 | vfree(c->ileb_buf); |
| 1766 | c->ileb_buf = NULL; |
| 1767 | ubifs_lpt_free(c, 1); |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1768 | c->ro_mount = 1; |
Artem Bityutskiy | 84abf97 | 2009-01-23 14:54:59 +0200 | [diff] [blame] | 1769 | err = dbg_check_space_info(c); |
| 1770 | if (err) |
| 1771 | ubifs_ro_mode(c, err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1772 | mutex_unlock(&c->umount_mutex); |
| 1773 | } |
| 1774 | |
| 1775 | static void ubifs_put_super(struct super_block *sb) |
| 1776 | { |
| 1777 | int i; |
| 1778 | struct ubifs_info *c = sb->s_fs_info; |
| 1779 | |
| 1780 | ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num, |
| 1781 | c->vi.vol_id); |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 1782 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1783 | /* |
| 1784 | * The following asserts are only valid if there has not been a failure |
| 1785 | * of the media. For example, there will be dirty inodes if we failed |
| 1786 | * to write them back because of I/O errors. |
| 1787 | */ |
Artem Bityutskiy | 1a067a2 | 2011-04-21 10:39:54 +0300 | [diff] [blame] | 1788 | if (!c->ro_error) { |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 1789 | ubifs_assert(c->bi.idx_growth == 0); |
| 1790 | ubifs_assert(c->bi.dd_growth == 0); |
| 1791 | ubifs_assert(c->bi.data_growth == 0); |
Artem Bityutskiy | 1a067a2 | 2011-04-21 10:39:54 +0300 | [diff] [blame] | 1792 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1793 | |
| 1794 | /* |
| 1795 | * The 'c->umount_lock' prevents races between UBIFS memory shrinker |
| 1796 | * and file system un-mount. Namely, it prevents the shrinker from |
| 1797 | * picking this superblock for shrinking - it will be just skipped if |
| 1798 | * the mutex is locked. |
| 1799 | */ |
| 1800 | mutex_lock(&c->umount_mutex); |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1801 | if (!c->ro_mount) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1802 | /* |
| 1803 | * First of all kill the background thread to make sure it does |
| 1804 | * not interfere with un-mounting and freeing resources. |
| 1805 | */ |
| 1806 | if (c->bgt) { |
| 1807 | kthread_stop(c->bgt); |
| 1808 | c->bgt = NULL; |
| 1809 | } |
| 1810 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1811 | /* |
Artem Bityutskiy | 2680d72 | 2010-09-17 16:44:28 +0300 | [diff] [blame] | 1812 | * On fatal errors c->ro_error is set to 1, in which case we do |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1813 | * not write the master node. |
| 1814 | */ |
Artem Bityutskiy | 2680d72 | 2010-09-17 16:44:28 +0300 | [diff] [blame] | 1815 | if (!c->ro_error) { |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1816 | int err; |
| 1817 | |
| 1818 | /* Synchronize write-buffers */ |
Artem Bityutskiy | 3903755 | 2010-10-18 08:28:50 +0300 | [diff] [blame] | 1819 | for (i = 0; i < c->jhead_cnt; i++) |
| 1820 | ubifs_wbuf_sync(&c->jheads[i].wbuf); |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1821 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1822 | /* |
| 1823 | * We are being cleanly unmounted which means the |
| 1824 | * orphans were killed - indicate this in the master |
| 1825 | * node. Also save the reserved GC LEB number. |
| 1826 | */ |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1827 | c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY); |
| 1828 | c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS); |
| 1829 | c->mst_node->gc_lnum = cpu_to_le32(c->gc_lnum); |
| 1830 | err = ubifs_write_master(c); |
| 1831 | if (err) |
| 1832 | /* |
| 1833 | * Recovery will attempt to fix the master area |
| 1834 | * next mount, so we just print a message and |
| 1835 | * continue to unmount normally. |
| 1836 | */ |
| 1837 | ubifs_err("failed to write master node, " |
| 1838 | "error %d", err); |
Artem Bityutskiy | 3601ba2 | 2010-10-18 08:32:35 +0300 | [diff] [blame] | 1839 | } else { |
| 1840 | for (i = 0; i < c->jhead_cnt; i++) |
| 1841 | /* Make sure write-buffer timers are canceled */ |
| 1842 | hrtimer_cancel(&c->jheads[i].wbuf.timer); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | ubifs_umount(c); |
| 1847 | bdi_destroy(&c->bdi); |
| 1848 | ubi_close_volume(c->ubi); |
| 1849 | mutex_unlock(&c->umount_mutex); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1850 | } |
| 1851 | |
| 1852 | static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) |
| 1853 | { |
| 1854 | int err; |
| 1855 | struct ubifs_info *c = sb->s_fs_info; |
| 1856 | |
| 1857 | dbg_gen("old flags %#lx, new flags %#x", sb->s_flags, *flags); |
| 1858 | |
| 1859 | err = ubifs_parse_options(c, data, 1); |
| 1860 | if (err) { |
| 1861 | ubifs_err("invalid or unknown remount parameter"); |
| 1862 | return err; |
| 1863 | } |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1864 | |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1865 | if (c->ro_mount && !(*flags & MS_RDONLY)) { |
Artem Bityutskiy | 2680d72 | 2010-09-17 16:44:28 +0300 | [diff] [blame] | 1866 | if (c->ro_error) { |
| 1867 | ubifs_msg("cannot re-mount R/W due to prior errors"); |
| 1868 | return -EROFS; |
| 1869 | } |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1870 | if (c->ro_media) { |
Artem Bityutskiy | 2680d72 | 2010-09-17 16:44:28 +0300 | [diff] [blame] | 1871 | ubifs_msg("cannot re-mount R/W - UBI volume is R/O"); |
Artem Bityutskiy | a2b9df3 | 2009-01-29 16:22:54 +0200 | [diff] [blame] | 1872 | return -EROFS; |
Artem Bityutskiy | e4d9b6c | 2009-01-23 14:17:36 +0200 | [diff] [blame] | 1873 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1874 | err = ubifs_remount_rw(c); |
Artem Bityutskiy | e9d6bbc | 2009-07-19 13:51:04 +0300 | [diff] [blame] | 1875 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1876 | return err; |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 1877 | } else if (!c->ro_mount && (*flags & MS_RDONLY)) { |
Artem Bityutskiy | 2680d72 | 2010-09-17 16:44:28 +0300 | [diff] [blame] | 1878 | if (c->ro_error) { |
| 1879 | ubifs_msg("cannot re-mount R/O due to prior errors"); |
Artem Bityutskiy | a2b9df3 | 2009-01-29 16:22:54 +0200 | [diff] [blame] | 1880 | return -EROFS; |
Adrian Hunter | b466f17 | 2009-01-29 12:59:33 +0200 | [diff] [blame] | 1881 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1882 | ubifs_remount_ro(c); |
Adrian Hunter | b466f17 | 2009-01-29 12:59:33 +0200 | [diff] [blame] | 1883 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1884 | |
Artem Bityutskiy | 3477d20 | 2008-11-19 11:53:15 +0200 | [diff] [blame] | 1885 | if (c->bulk_read == 1) |
| 1886 | bu_init(c); |
| 1887 | else { |
| 1888 | dbg_gen("disable bulk-read"); |
| 1889 | kfree(c->bu.buf); |
| 1890 | c->bu.buf = NULL; |
| 1891 | } |
| 1892 | |
Artem Bityutskiy | b221337 | 2009-03-15 17:20:22 +0200 | [diff] [blame] | 1893 | ubifs_assert(c->lst.taken_empty_lebs > 0); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1894 | return 0; |
| 1895 | } |
| 1896 | |
Artem Bityutskiy | e8b8156 | 2009-01-15 17:43:23 +0200 | [diff] [blame] | 1897 | const struct super_operations ubifs_super_operations = { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1898 | .alloc_inode = ubifs_alloc_inode, |
| 1899 | .destroy_inode = ubifs_destroy_inode, |
| 1900 | .put_super = ubifs_put_super, |
| 1901 | .write_inode = ubifs_write_inode, |
Al Viro | d640e1b | 2010-06-07 00:34:05 -0400 | [diff] [blame] | 1902 | .evict_inode = ubifs_evict_inode, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1903 | .statfs = ubifs_statfs, |
| 1904 | .dirty_inode = ubifs_dirty_inode, |
| 1905 | .remount_fs = ubifs_remount_fs, |
| 1906 | .show_options = ubifs_show_options, |
| 1907 | .sync_fs = ubifs_sync_fs, |
| 1908 | }; |
| 1909 | |
| 1910 | /** |
| 1911 | * open_ubi - parse UBI device name string and open the UBI device. |
| 1912 | * @name: UBI volume name |
| 1913 | * @mode: UBI volume open mode |
| 1914 | * |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1915 | * The primary method of mounting UBIFS is by specifying the UBI volume |
| 1916 | * character device node path. However, UBIFS may also be mounted withoug any |
| 1917 | * character device node using one of the following methods: |
| 1918 | * |
| 1919 | * o ubiX_Y - mount UBI device number X, volume Y; |
| 1920 | * o ubiY - mount UBI device number 0, volume Y; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1921 | * o ubiX:NAME - mount UBI device X, volume with name NAME; |
| 1922 | * o ubi:NAME - mount UBI device 0, volume with name NAME. |
| 1923 | * |
| 1924 | * Alternative '!' separator may be used instead of ':' (because some shells |
| 1925 | * like busybox may interpret ':' as an NFS host name separator). This function |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1926 | * returns UBI volume description object in case of success and a negative |
| 1927 | * error code in case of failure. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1928 | */ |
| 1929 | static struct ubi_volume_desc *open_ubi(const char *name, int mode) |
| 1930 | { |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1931 | struct ubi_volume_desc *ubi; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1932 | int dev, vol; |
| 1933 | char *endptr; |
| 1934 | |
Corentin Chary | 9722324 | 2009-09-28 21:10:12 +0200 | [diff] [blame] | 1935 | /* First, try to open using the device node path method */ |
| 1936 | ubi = ubi_open_volume_path(name, mode); |
| 1937 | if (!IS_ERR(ubi)) |
| 1938 | return ubi; |
| 1939 | |
| 1940 | /* Try the "nodev" method */ |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1941 | if (name[0] != 'u' || name[1] != 'b' || name[2] != 'i') |
| 1942 | return ERR_PTR(-EINVAL); |
| 1943 | |
| 1944 | /* ubi:NAME method */ |
| 1945 | if ((name[3] == ':' || name[3] == '!') && name[4] != '\0') |
| 1946 | return ubi_open_volume_nm(0, name + 4, mode); |
| 1947 | |
| 1948 | if (!isdigit(name[3])) |
| 1949 | return ERR_PTR(-EINVAL); |
| 1950 | |
| 1951 | dev = simple_strtoul(name + 3, &endptr, 0); |
| 1952 | |
| 1953 | /* ubiY method */ |
| 1954 | if (*endptr == '\0') |
| 1955 | return ubi_open_volume(0, dev, mode); |
| 1956 | |
| 1957 | /* ubiX_Y method */ |
| 1958 | if (*endptr == '_' && isdigit(endptr[1])) { |
| 1959 | vol = simple_strtoul(endptr + 1, &endptr, 0); |
| 1960 | if (*endptr != '\0') |
| 1961 | return ERR_PTR(-EINVAL); |
| 1962 | return ubi_open_volume(dev, vol, mode); |
| 1963 | } |
| 1964 | |
| 1965 | /* ubiX:NAME method */ |
| 1966 | if ((*endptr == ':' || *endptr == '!') && endptr[1] != '\0') |
| 1967 | return ubi_open_volume_nm(dev, ++endptr, mode); |
| 1968 | |
| 1969 | return ERR_PTR(-EINVAL); |
| 1970 | } |
| 1971 | |
Al Viro | b1c27ab | 2011-06-12 10:07:03 -0400 | [diff] [blame] | 1972 | static struct ubifs_info *alloc_ubifs_info(struct ubi_volume_desc *ubi) |
| 1973 | { |
| 1974 | struct ubifs_info *c; |
| 1975 | |
| 1976 | c = kzalloc(sizeof(struct ubifs_info), GFP_KERNEL); |
| 1977 | if (c) { |
| 1978 | spin_lock_init(&c->cnt_lock); |
| 1979 | spin_lock_init(&c->cs_lock); |
| 1980 | spin_lock_init(&c->buds_lock); |
| 1981 | spin_lock_init(&c->space_lock); |
| 1982 | spin_lock_init(&c->orphan_lock); |
| 1983 | init_rwsem(&c->commit_sem); |
| 1984 | mutex_init(&c->lp_mutex); |
| 1985 | mutex_init(&c->tnc_mutex); |
| 1986 | mutex_init(&c->log_mutex); |
| 1987 | mutex_init(&c->mst_mutex); |
| 1988 | mutex_init(&c->umount_mutex); |
| 1989 | mutex_init(&c->bu_mutex); |
| 1990 | mutex_init(&c->write_reserve_mutex); |
| 1991 | init_waitqueue_head(&c->cmt_wq); |
| 1992 | c->buds = RB_ROOT; |
| 1993 | c->old_idx = RB_ROOT; |
| 1994 | c->size_tree = RB_ROOT; |
| 1995 | c->orph_tree = RB_ROOT; |
| 1996 | INIT_LIST_HEAD(&c->infos_list); |
| 1997 | INIT_LIST_HEAD(&c->idx_gc); |
| 1998 | INIT_LIST_HEAD(&c->replay_list); |
| 1999 | INIT_LIST_HEAD(&c->replay_buds); |
| 2000 | INIT_LIST_HEAD(&c->uncat_list); |
| 2001 | INIT_LIST_HEAD(&c->empty_list); |
| 2002 | INIT_LIST_HEAD(&c->freeable_list); |
| 2003 | INIT_LIST_HEAD(&c->frdi_idx_list); |
| 2004 | INIT_LIST_HEAD(&c->unclean_leb_list); |
| 2005 | INIT_LIST_HEAD(&c->old_buds); |
| 2006 | INIT_LIST_HEAD(&c->orph_list); |
| 2007 | INIT_LIST_HEAD(&c->orph_new); |
| 2008 | c->no_chk_data_crc = 1; |
| 2009 | |
| 2010 | c->highest_inum = UBIFS_FIRST_INO; |
| 2011 | c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM; |
| 2012 | |
| 2013 | ubi_get_volume_info(ubi, &c->vi); |
| 2014 | ubi_get_device_info(c->vi.ubi_num, &c->di); |
| 2015 | } |
| 2016 | return c; |
| 2017 | } |
| 2018 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2019 | static int ubifs_fill_super(struct super_block *sb, void *data, int silent) |
| 2020 | { |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2021 | struct ubifs_info *c = sb->s_fs_info; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2022 | struct inode *root; |
| 2023 | int err; |
| 2024 | |
Artem Bityutskiy | 8379ea3 | 2009-05-29 12:34:52 +0300 | [diff] [blame] | 2025 | c->vfs_sb = sb; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2026 | /* Re-open the UBI device in read-write mode */ |
| 2027 | c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READWRITE); |
| 2028 | if (IS_ERR(c->ubi)) { |
| 2029 | err = PTR_ERR(c->ubi); |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2030 | goto out; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2031 | } |
| 2032 | |
| 2033 | /* |
Artem Bityutskiy | 0a883a0 | 2008-08-13 14:13:26 +0300 | [diff] [blame] | 2034 | * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2035 | * UBIFS, I/O is not deferred, it is done immediately in readpage, |
| 2036 | * 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] | 2037 | * but the read-ahead I/O as well i.e. completely pointless. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2038 | * |
| 2039 | * Read-ahead will be disabled because @c->bdi.ra_pages is 0. |
| 2040 | */ |
Jens Axboe | d993831 | 2009-06-12 14:45:52 +0200 | [diff] [blame] | 2041 | c->bdi.name = "ubifs", |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2042 | c->bdi.capabilities = BDI_CAP_MAP_COPY; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2043 | err = bdi_init(&c->bdi); |
| 2044 | if (err) |
| 2045 | goto out_close; |
Daniel Mack | 7fcd9c3 | 2009-07-02 17:15:47 +0200 | [diff] [blame] | 2046 | err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d", |
| 2047 | c->vi.ubi_num, c->vi.vol_id); |
Jens Axboe | a979eff | 2009-05-29 09:19:23 +0200 | [diff] [blame] | 2048 | if (err) |
| 2049 | goto out_bdi; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2050 | |
| 2051 | err = ubifs_parse_options(c, data, 0); |
| 2052 | if (err) |
| 2053 | goto out_bdi; |
| 2054 | |
Jens Axboe | 32a88aa | 2009-09-16 15:02:33 +0200 | [diff] [blame] | 2055 | sb->s_bdi = &c->bdi; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2056 | sb->s_fs_info = c; |
| 2057 | sb->s_magic = UBIFS_SUPER_MAGIC; |
| 2058 | sb->s_blocksize = UBIFS_BLOCK_SIZE; |
| 2059 | sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2060 | sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c); |
| 2061 | if (c->max_inode_sz > MAX_LFS_FILESIZE) |
| 2062 | sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE; |
| 2063 | sb->s_op = &ubifs_super_operations; |
| 2064 | |
| 2065 | mutex_lock(&c->umount_mutex); |
| 2066 | err = mount_ubifs(c); |
| 2067 | if (err) { |
| 2068 | ubifs_assert(err < 0); |
| 2069 | goto out_unlock; |
| 2070 | } |
| 2071 | |
| 2072 | /* Read the root inode */ |
| 2073 | root = ubifs_iget(sb, UBIFS_ROOT_INO); |
| 2074 | if (IS_ERR(root)) { |
| 2075 | err = PTR_ERR(root); |
| 2076 | goto out_umount; |
| 2077 | } |
| 2078 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 2079 | sb->s_root = d_make_root(root); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2080 | if (!sb->s_root) |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 2081 | goto out_umount; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2082 | |
| 2083 | mutex_unlock(&c->umount_mutex); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2084 | return 0; |
| 2085 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2086 | out_umount: |
| 2087 | ubifs_umount(c); |
| 2088 | out_unlock: |
| 2089 | mutex_unlock(&c->umount_mutex); |
| 2090 | out_bdi: |
| 2091 | bdi_destroy(&c->bdi); |
| 2092 | out_close: |
| 2093 | ubi_close_volume(c->ubi); |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2094 | out: |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2095 | return err; |
| 2096 | } |
| 2097 | |
| 2098 | static int sb_test(struct super_block *sb, void *data) |
| 2099 | { |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2100 | struct ubifs_info *c1 = data; |
Artem Bityutskiy | 7c83f5c | 2009-05-25 19:23:04 +0300 | [diff] [blame] | 2101 | struct ubifs_info *c = sb->s_fs_info; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2102 | |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2103 | return c->vi.cdev == c1->vi.cdev; |
| 2104 | } |
| 2105 | |
| 2106 | static int sb_set(struct super_block *sb, void *data) |
| 2107 | { |
| 2108 | sb->s_fs_info = data; |
| 2109 | return set_anon_super(sb, NULL); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2110 | } |
| 2111 | |
Al Viro | 157d81e | 2010-07-25 23:52:42 +0400 | [diff] [blame] | 2112 | static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags, |
| 2113 | const char *name, void *data) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2114 | { |
| 2115 | struct ubi_volume_desc *ubi; |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2116 | struct ubifs_info *c; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2117 | struct super_block *sb; |
| 2118 | int err; |
| 2119 | |
| 2120 | dbg_gen("name %s, flags %#x", name, flags); |
| 2121 | |
| 2122 | /* |
| 2123 | * Get UBI device number and volume ID. Mount it read-only so far |
| 2124 | * because this might be a new mount point, and UBI allows only one |
| 2125 | * read-write user at a time. |
| 2126 | */ |
| 2127 | ubi = open_ubi(name, UBI_READONLY); |
| 2128 | if (IS_ERR(ubi)) { |
Steffen Sledz | 54dd55a | 2010-09-27 14:20:26 +0200 | [diff] [blame] | 2129 | dbg_err("cannot open \"%s\", error %d", |
| 2130 | name, (int)PTR_ERR(ubi)); |
Al Viro | 157d81e | 2010-07-25 23:52:42 +0400 | [diff] [blame] | 2131 | return ERR_CAST(ubi); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2132 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2133 | |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2134 | c = alloc_ubifs_info(ubi); |
| 2135 | if (!c) { |
| 2136 | err = -ENOMEM; |
| 2137 | goto out_close; |
| 2138 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2139 | |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2140 | dbg_gen("opened ubi%d_%d", c->vi.ubi_num, c->vi.vol_id); |
| 2141 | |
| 2142 | sb = sget(fs_type, sb_test, sb_set, c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2143 | if (IS_ERR(sb)) { |
| 2144 | err = PTR_ERR(sb); |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2145 | kfree(c); |
Dan Carpenter | 185bf87 | 2011-06-20 10:10:24 +0300 | [diff] [blame] | 2146 | goto out_close; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2147 | } |
| 2148 | |
| 2149 | if (sb->s_root) { |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 2150 | struct ubifs_info *c1 = sb->s_fs_info; |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2151 | kfree(c); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2152 | /* A new mount point for already mounted UBIFS */ |
| 2153 | dbg_gen("this ubi volume is already mounted"); |
Artem Bityutskiy | 2ef1329 | 2010-09-19 18:34:26 +0300 | [diff] [blame] | 2154 | if (!!(flags & MS_RDONLY) != c1->ro_mount) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2155 | err = -EBUSY; |
| 2156 | goto out_deact; |
| 2157 | } |
| 2158 | } else { |
| 2159 | sb->s_flags = flags; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2160 | err = ubifs_fill_super(sb, data, flags & MS_SILENT ? 1 : 0); |
| 2161 | if (err) |
| 2162 | goto out_deact; |
| 2163 | /* We do not support atime */ |
| 2164 | sb->s_flags |= MS_ACTIVE | MS_NOATIME; |
| 2165 | } |
| 2166 | |
| 2167 | /* 'fill_super()' opens ubi again so we must close it here */ |
| 2168 | ubi_close_volume(ubi); |
| 2169 | |
Al Viro | 157d81e | 2010-07-25 23:52:42 +0400 | [diff] [blame] | 2170 | return dget(sb->s_root); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2171 | |
| 2172 | out_deact: |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 2173 | deactivate_locked_super(sb); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2174 | out_close: |
| 2175 | ubi_close_volume(ubi); |
Al Viro | 157d81e | 2010-07-25 23:52:42 +0400 | [diff] [blame] | 2176 | return ERR_PTR(err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2177 | } |
| 2178 | |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2179 | static void kill_ubifs_super(struct super_block *s) |
| 2180 | { |
| 2181 | struct ubifs_info *c = s->s_fs_info; |
| 2182 | kill_anon_super(s); |
| 2183 | kfree(c); |
| 2184 | } |
| 2185 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2186 | static struct file_system_type ubifs_fs_type = { |
| 2187 | .name = "ubifs", |
| 2188 | .owner = THIS_MODULE, |
Al Viro | 157d81e | 2010-07-25 23:52:42 +0400 | [diff] [blame] | 2189 | .mount = ubifs_mount, |
Al Viro | d251ed2 | 2011-06-12 10:24:33 -0400 | [diff] [blame] | 2190 | .kill_sb = kill_ubifs_super, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2191 | }; |
| 2192 | |
| 2193 | /* |
| 2194 | * Inode slab cache constructor. |
| 2195 | */ |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 2196 | static void inode_slab_ctor(void *obj) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2197 | { |
| 2198 | struct ubifs_inode *ui = obj; |
| 2199 | inode_init_once(&ui->vfs_inode); |
| 2200 | } |
| 2201 | |
| 2202 | static int __init ubifs_init(void) |
| 2203 | { |
| 2204 | int err; |
| 2205 | |
| 2206 | BUILD_BUG_ON(sizeof(struct ubifs_ch) != 24); |
| 2207 | |
| 2208 | /* Make sure node sizes are 8-byte aligned */ |
| 2209 | BUILD_BUG_ON(UBIFS_CH_SZ & 7); |
| 2210 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ & 7); |
| 2211 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ & 7); |
| 2212 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ & 7); |
| 2213 | BUILD_BUG_ON(UBIFS_DATA_NODE_SZ & 7); |
| 2214 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ & 7); |
| 2215 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ & 7); |
| 2216 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ & 7); |
| 2217 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ & 7); |
| 2218 | BUILD_BUG_ON(UBIFS_CS_NODE_SZ & 7); |
| 2219 | BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ & 7); |
| 2220 | |
| 2221 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ & 7); |
| 2222 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ & 7); |
| 2223 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ & 7); |
| 2224 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ & 7); |
| 2225 | BUILD_BUG_ON(UBIFS_MAX_NODE_SZ & 7); |
| 2226 | BUILD_BUG_ON(MIN_WRITE_SZ & 7); |
| 2227 | |
| 2228 | /* Check min. node size */ |
| 2229 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ < MIN_WRITE_SZ); |
| 2230 | BUILD_BUG_ON(UBIFS_DENT_NODE_SZ < MIN_WRITE_SZ); |
| 2231 | BUILD_BUG_ON(UBIFS_XENT_NODE_SZ < MIN_WRITE_SZ); |
| 2232 | BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ < MIN_WRITE_SZ); |
| 2233 | |
| 2234 | BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2235 | BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2236 | BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2237 | BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ > UBIFS_MAX_NODE_SZ); |
| 2238 | |
| 2239 | /* Defined node sizes */ |
| 2240 | BUILD_BUG_ON(UBIFS_SB_NODE_SZ != 4096); |
| 2241 | BUILD_BUG_ON(UBIFS_MST_NODE_SZ != 512); |
| 2242 | BUILD_BUG_ON(UBIFS_INO_NODE_SZ != 160); |
| 2243 | BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); |
| 2244 | |
| 2245 | /* |
Artem Bityutskiy | a1dc080 | 2008-11-01 14:20:50 +0200 | [diff] [blame] | 2246 | * We use 2 bit wide bit-fields to store compression type, which should |
| 2247 | * be amended if more compressors are added. The bit-fields are: |
Artem Bityutskiy | 553dea4 | 2008-11-01 14:57:49 +0200 | [diff] [blame] | 2248 | * @compr_type in 'struct ubifs_inode', @default_compr in |
| 2249 | * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'. |
Artem Bityutskiy | a1dc080 | 2008-11-01 14:20:50 +0200 | [diff] [blame] | 2250 | */ |
| 2251 | BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); |
| 2252 | |
| 2253 | /* |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2254 | * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to |
| 2255 | * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. |
| 2256 | */ |
| 2257 | if (PAGE_CACHE_SIZE < UBIFS_BLOCK_SIZE) { |
| 2258 | ubifs_err("VFS page cache size is %u bytes, but UBIFS requires" |
| 2259 | " at least 4096 bytes", |
| 2260 | (unsigned int)PAGE_CACHE_SIZE); |
| 2261 | return -EINVAL; |
| 2262 | } |
| 2263 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2264 | ubifs_inode_slab = kmem_cache_create("ubifs_inode_slab", |
| 2265 | sizeof(struct ubifs_inode), 0, |
| 2266 | SLAB_MEM_SPREAD | SLAB_RECLAIM_ACCOUNT, |
| 2267 | &inode_slab_ctor); |
| 2268 | if (!ubifs_inode_slab) |
Al Viro | 5cc361e | 2011-12-12 23:58:21 -0500 | [diff] [blame] | 2269 | return -ENOMEM; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2270 | |
| 2271 | register_shrinker(&ubifs_shrinker_info); |
| 2272 | |
| 2273 | err = ubifs_compressors_init(); |
| 2274 | if (err) |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 2275 | goto out_shrinker; |
| 2276 | |
| 2277 | err = dbg_debugfs_init(); |
| 2278 | if (err) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2279 | goto out_compr; |
| 2280 | |
Al Viro | 5cc361e | 2011-12-12 23:58:21 -0500 | [diff] [blame] | 2281 | err = register_filesystem(&ubifs_fs_type); |
| 2282 | if (err) { |
| 2283 | ubifs_err("cannot register file system, error %d", err); |
| 2284 | goto out_dbg; |
| 2285 | } |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2286 | return 0; |
| 2287 | |
Al Viro | 5cc361e | 2011-12-12 23:58:21 -0500 | [diff] [blame] | 2288 | out_dbg: |
| 2289 | dbg_debugfs_exit(); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2290 | out_compr: |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 2291 | ubifs_compressors_exit(); |
| 2292 | out_shrinker: |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2293 | unregister_shrinker(&ubifs_shrinker_info); |
| 2294 | kmem_cache_destroy(ubifs_inode_slab); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2295 | return err; |
| 2296 | } |
| 2297 | /* late_initcall to let compressors initialize first */ |
| 2298 | late_initcall(ubifs_init); |
| 2299 | |
| 2300 | static void __exit ubifs_exit(void) |
| 2301 | { |
| 2302 | ubifs_assert(list_empty(&ubifs_infos)); |
| 2303 | ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt) == 0); |
| 2304 | |
Artem Bityutskiy | 552ff31 | 2008-10-23 11:49:28 +0300 | [diff] [blame] | 2305 | dbg_debugfs_exit(); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 2306 | ubifs_compressors_exit(); |
| 2307 | unregister_shrinker(&ubifs_shrinker_info); |
| 2308 | kmem_cache_destroy(ubifs_inode_slab); |
| 2309 | unregister_filesystem(&ubifs_fs_type); |
| 2310 | } |
| 2311 | module_exit(ubifs_exit); |
| 2312 | |
| 2313 | MODULE_LICENSE("GPL"); |
| 2314 | MODULE_VERSION(__stringify(UBIFS_VERSION)); |
| 2315 | MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter"); |
| 2316 | MODULE_DESCRIPTION("UBIFS - UBI File System"); |