Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1 | /* * This file is part of UBIFS. |
| 2 | * |
| 3 | * Copyright (C) 2006-2008 Nokia Corporation. |
| 4 | * Copyright (C) 2006, 2007 University of Szeged, Hungary |
| 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 | * Zoltan Sogor |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * This file implements directory operations. |
| 26 | * |
| 27 | * All FS operations in this file allocate budget before writing anything to the |
| 28 | * media. If they fail to allocate it, the error is returned. The only |
| 29 | * exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even |
| 30 | * if they unable to allocate the budget, because deletion %-ENOSPC failure is |
| 31 | * not what users are usually ready to get. UBIFS budgeting subsystem has some |
| 32 | * space reserved for these purposes. |
| 33 | * |
| 34 | * All operations in this file write all inodes which they change straight |
| 35 | * away, instead of marking them dirty. For example, 'ubifs_link()' changes |
| 36 | * @i_size of the parent inode and writes the parent inode together with the |
| 37 | * target inode. This was done to simplify file-system recovery which would |
| 38 | * otherwise be very difficult to do. The only exception is rename which marks |
| 39 | * the re-named inode dirty (because its @i_ctime is updated) but does not |
| 40 | * write it, but just marks it as dirty. |
| 41 | */ |
| 42 | |
| 43 | #include "ubifs.h" |
| 44 | |
| 45 | /** |
| 46 | * inherit_flags - inherit flags of the parent inode. |
| 47 | * @dir: parent inode |
| 48 | * @mode: new inode mode flags |
| 49 | * |
| 50 | * This is a helper function for 'ubifs_new_inode()' which inherits flag of the |
| 51 | * parent directory inode @dir. UBIFS inodes inherit the following flags: |
| 52 | * o %UBIFS_COMPR_FL, which is useful to switch compression on/of on |
| 53 | * sub-directory basis; |
| 54 | * o %UBIFS_SYNC_FL - useful for the same reasons; |
| 55 | * o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories. |
| 56 | * |
| 57 | * This function returns the inherited flags. |
| 58 | */ |
Al Viro | ad44be5 | 2011-07-26 03:12:59 -0400 | [diff] [blame] | 59 | static int inherit_flags(const struct inode *dir, umode_t mode) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 60 | { |
| 61 | int flags; |
| 62 | const struct ubifs_inode *ui = ubifs_inode(dir); |
| 63 | |
| 64 | if (!S_ISDIR(dir->i_mode)) |
| 65 | /* |
| 66 | * The parent is not a directory, which means that an extended |
| 67 | * attribute inode is being created. No flags. |
| 68 | */ |
| 69 | return 0; |
| 70 | |
| 71 | flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL); |
| 72 | if (!S_ISDIR(mode)) |
| 73 | /* The "DIRSYNC" flag only applies to directories */ |
| 74 | flags &= ~UBIFS_DIRSYNC_FL; |
| 75 | return flags; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * ubifs_new_inode - allocate new UBIFS inode object. |
| 80 | * @c: UBIFS file-system description object |
| 81 | * @dir: parent directory inode |
| 82 | * @mode: inode mode flags |
| 83 | * |
| 84 | * This function finds an unused inode number, allocates new inode and |
| 85 | * initializes it. Returns new inode in case of success and an error code in |
| 86 | * case of failure. |
| 87 | */ |
| 88 | struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir, |
Al Viro | ad44be5 | 2011-07-26 03:12:59 -0400 | [diff] [blame] | 89 | umode_t mode) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 90 | { |
| 91 | struct inode *inode; |
| 92 | struct ubifs_inode *ui; |
| 93 | |
| 94 | inode = new_inode(c->vfs_sb); |
| 95 | ui = ubifs_inode(inode); |
| 96 | if (!inode) |
| 97 | return ERR_PTR(-ENOMEM); |
| 98 | |
| 99 | /* |
| 100 | * Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and |
| 101 | * marking them dirty in file write path (see 'file_update_time()'). |
| 102 | * UBIFS has to fully control "clean <-> dirty" transitions of inodes |
| 103 | * to make budgeting work. |
| 104 | */ |
Artem Bityutskiy | 12e776a | 2011-05-27 15:50:39 +0300 | [diff] [blame] | 105 | inode->i_flags |= S_NOCMTIME; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 106 | |
Dmitry Monakhov | abf5d08 | 2010-03-04 17:32:21 +0300 | [diff] [blame] | 107 | inode_init_owner(inode, dir, mode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 108 | inode->i_mtime = inode->i_atime = inode->i_ctime = |
| 109 | ubifs_current_time(inode); |
| 110 | inode->i_mapping->nrpages = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 111 | |
| 112 | switch (mode & S_IFMT) { |
| 113 | case S_IFREG: |
| 114 | inode->i_mapping->a_ops = &ubifs_file_address_operations; |
| 115 | inode->i_op = &ubifs_file_inode_operations; |
| 116 | inode->i_fop = &ubifs_file_operations; |
| 117 | break; |
| 118 | case S_IFDIR: |
| 119 | inode->i_op = &ubifs_dir_inode_operations; |
| 120 | inode->i_fop = &ubifs_dir_operations; |
| 121 | inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ; |
| 122 | break; |
| 123 | case S_IFLNK: |
| 124 | inode->i_op = &ubifs_symlink_inode_operations; |
| 125 | break; |
| 126 | case S_IFSOCK: |
| 127 | case S_IFIFO: |
| 128 | case S_IFBLK: |
| 129 | case S_IFCHR: |
| 130 | inode->i_op = &ubifs_file_inode_operations; |
| 131 | break; |
| 132 | default: |
| 133 | BUG(); |
| 134 | } |
| 135 | |
| 136 | ui->flags = inherit_flags(dir, mode); |
| 137 | ubifs_set_inode_flags(inode); |
| 138 | if (S_ISREG(mode)) |
| 139 | ui->compr_type = c->default_compr; |
| 140 | else |
| 141 | ui->compr_type = UBIFS_COMPR_NONE; |
| 142 | ui->synced_i_size = 0; |
| 143 | |
| 144 | spin_lock(&c->cnt_lock); |
| 145 | /* Inode number overflow is currently not supported */ |
| 146 | if (c->highest_inum >= INUM_WARN_WATERMARK) { |
| 147 | if (c->highest_inum >= INUM_WATERMARK) { |
| 148 | spin_unlock(&c->cnt_lock); |
Sheng Yong | 235c362 | 2015-03-20 10:39:42 +0000 | [diff] [blame] | 149 | ubifs_err(c, "out of inode numbers"); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 150 | make_bad_inode(inode); |
| 151 | iput(inode); |
| 152 | return ERR_PTR(-EINVAL); |
| 153 | } |
Sheng Yong | 1a7e985d | 2015-04-03 03:13:42 +0000 | [diff] [blame] | 154 | ubifs_warn(c, "running out of inode numbers (current %lu, max %u)", |
Artem Bityutskiy | e84461a | 2008-10-29 12:08:43 +0200 | [diff] [blame] | 155 | (unsigned long)c->highest_inum, INUM_WATERMARK); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | inode->i_ino = ++c->highest_inum; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 159 | /* |
| 160 | * The creation sequence number remains with this inode for its |
| 161 | * lifetime. All nodes for this inode have a greater sequence number, |
| 162 | * and so it is possible to distinguish obsolete nodes belonging to a |
| 163 | * previous incarnation of the same inode number - for example, for the |
| 164 | * purpose of rebuilding the index. |
| 165 | */ |
| 166 | ui->creat_sqnum = ++c->max_sqnum; |
| 167 | spin_unlock(&c->cnt_lock); |
| 168 | return inode; |
| 169 | } |
| 170 | |
Artem Bityutskiy | bb2615d | 2011-05-31 17:47:53 +0300 | [diff] [blame] | 171 | static int dbg_check_name(const struct ubifs_info *c, |
| 172 | const struct ubifs_dent_node *dent, |
| 173 | const struct qstr *nm) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 174 | { |
Artem Bityutskiy | 2b1844a | 2011-06-03 08:31:29 +0300 | [diff] [blame] | 175 | if (!dbg_is_chk_gen(c)) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 176 | return 0; |
| 177 | if (le16_to_cpu(dent->nlen) != nm->len) |
| 178 | return -EINVAL; |
| 179 | if (memcmp(dent->name, nm->name, nm->len)) |
| 180 | return -EINVAL; |
| 181 | return 0; |
| 182 | } |
| 183 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 184 | static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 185 | unsigned int flags) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 186 | { |
| 187 | int err; |
| 188 | union ubifs_key key; |
| 189 | struct inode *inode = NULL; |
| 190 | struct ubifs_dent_node *dent; |
| 191 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
| 192 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 193 | dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 194 | |
| 195 | if (dentry->d_name.len > UBIFS_MAX_NLEN) |
| 196 | return ERR_PTR(-ENAMETOOLONG); |
| 197 | |
| 198 | dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS); |
| 199 | if (!dent) |
| 200 | return ERR_PTR(-ENOMEM); |
| 201 | |
| 202 | dent_key_init(c, &key, dir->i_ino, &dentry->d_name); |
| 203 | |
| 204 | err = ubifs_tnc_lookup_nm(c, &key, dent, &dentry->d_name); |
| 205 | if (err) { |
Artem Bityutskiy | 720b499 | 2008-08-13 16:16:31 +0300 | [diff] [blame] | 206 | if (err == -ENOENT) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 207 | dbg_gen("not found"); |
| 208 | goto done; |
| 209 | } |
| 210 | goto out; |
| 211 | } |
| 212 | |
Artem Bityutskiy | bb2615d | 2011-05-31 17:47:53 +0300 | [diff] [blame] | 213 | if (dbg_check_name(c, dent, &dentry->d_name)) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 214 | err = -EINVAL; |
| 215 | goto out; |
| 216 | } |
| 217 | |
| 218 | inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum)); |
| 219 | if (IS_ERR(inode)) { |
| 220 | /* |
| 221 | * This should not happen. Probably the file-system needs |
| 222 | * checking. |
| 223 | */ |
| 224 | err = PTR_ERR(inode); |
Sheng Yong | 235c362 | 2015-03-20 10:39:42 +0000 | [diff] [blame] | 225 | ubifs_err(c, "dead directory entry '%pd', error %d", |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 226 | dentry, err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 227 | ubifs_ro_mode(c, err); |
| 228 | goto out; |
| 229 | } |
| 230 | |
| 231 | done: |
| 232 | kfree(dent); |
| 233 | /* |
| 234 | * Note, d_splice_alias() would be required instead if we supported |
| 235 | * NFS. |
| 236 | */ |
| 237 | d_add(dentry, inode); |
| 238 | return NULL; |
| 239 | |
| 240 | out: |
| 241 | kfree(dent); |
| 242 | return ERR_PTR(err); |
| 243 | } |
| 244 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 245 | static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 246 | bool excl) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 247 | { |
| 248 | struct inode *inode; |
| 249 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
| 250 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
| 251 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
| 252 | .dirtied_ino = 1 }; |
| 253 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
| 254 | |
| 255 | /* |
| 256 | * Budget request settings: new inode, new direntry, changing the |
| 257 | * parent directory inode. |
| 258 | */ |
| 259 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 260 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
| 261 | dentry, mode, dir->i_ino); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 262 | |
| 263 | err = ubifs_budget_space(c, &req); |
| 264 | if (err) |
| 265 | return err; |
| 266 | |
| 267 | inode = ubifs_new_inode(c, dir, mode); |
| 268 | if (IS_ERR(inode)) { |
| 269 | err = PTR_ERR(inode); |
| 270 | goto out_budg; |
| 271 | } |
| 272 | |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 273 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
| 274 | if (err) |
Taesoo Kim | 9401a79 | 2015-03-25 09:53:37 +0100 | [diff] [blame] | 275 | goto out_inode; |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 276 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 277 | mutex_lock(&dir_ui->ui_mutex); |
| 278 | dir->i_size += sz_change; |
| 279 | dir_ui->ui_size = dir->i_size; |
| 280 | dir->i_mtime = dir->i_ctime = inode->i_ctime; |
| 281 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); |
| 282 | if (err) |
| 283 | goto out_cancel; |
| 284 | mutex_unlock(&dir_ui->ui_mutex); |
| 285 | |
| 286 | ubifs_release_budget(c, &req); |
| 287 | insert_inode_hash(inode); |
| 288 | d_instantiate(dentry, inode); |
| 289 | return 0; |
| 290 | |
| 291 | out_cancel: |
| 292 | dir->i_size -= sz_change; |
| 293 | dir_ui->ui_size = dir->i_size; |
| 294 | mutex_unlock(&dir_ui->ui_mutex); |
Taesoo Kim | 9401a79 | 2015-03-25 09:53:37 +0100 | [diff] [blame] | 295 | out_inode: |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 296 | make_bad_inode(inode); |
| 297 | iput(inode); |
| 298 | out_budg: |
| 299 | ubifs_release_budget(c, &req); |
Sheng Yong | 235c362 | 2015-03-20 10:39:42 +0000 | [diff] [blame] | 300 | ubifs_err(c, "cannot create regular file, error %d", err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 301 | return err; |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * vfs_dent_type - get VFS directory entry type. |
| 306 | * @type: UBIFS directory entry type |
| 307 | * |
| 308 | * This function converts UBIFS directory entry type into VFS directory entry |
| 309 | * type. |
| 310 | */ |
| 311 | static unsigned int vfs_dent_type(uint8_t type) |
| 312 | { |
| 313 | switch (type) { |
| 314 | case UBIFS_ITYPE_REG: |
| 315 | return DT_REG; |
| 316 | case UBIFS_ITYPE_DIR: |
| 317 | return DT_DIR; |
| 318 | case UBIFS_ITYPE_LNK: |
| 319 | return DT_LNK; |
| 320 | case UBIFS_ITYPE_BLK: |
| 321 | return DT_BLK; |
| 322 | case UBIFS_ITYPE_CHR: |
| 323 | return DT_CHR; |
| 324 | case UBIFS_ITYPE_FIFO: |
| 325 | return DT_FIFO; |
| 326 | case UBIFS_ITYPE_SOCK: |
| 327 | return DT_SOCK; |
| 328 | default: |
| 329 | BUG(); |
| 330 | } |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * The classical Unix view for directory is that it is a linear array of |
| 336 | * (name, inode number) entries. Linux/VFS assumes this model as well. |
| 337 | * Particularly, 'readdir()' call wants us to return a directory entry offset |
| 338 | * which later may be used to continue 'readdir()'ing the directory or to |
| 339 | * 'seek()' to that specific direntry. Obviously UBIFS does not really fit this |
| 340 | * model because directory entries are identified by keys, which may collide. |
| 341 | * |
| 342 | * UBIFS uses directory entry hash value for directory offsets, so |
| 343 | * 'seekdir()'/'telldir()' may not always work because of possible key |
| 344 | * collisions. But UBIFS guarantees that consecutive 'readdir()' calls work |
| 345 | * properly by means of saving full directory entry name in the private field |
| 346 | * of the file description object. |
| 347 | * |
| 348 | * This means that UBIFS cannot support NFS which requires full |
| 349 | * 'seekdir()'/'telldir()' support. |
| 350 | */ |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 351 | static int ubifs_readdir(struct file *file, struct dir_context *ctx) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 352 | { |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 353 | int err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 354 | struct qstr nm; |
| 355 | union ubifs_key key; |
| 356 | struct ubifs_dent_node *dent; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 357 | struct inode *dir = file_inode(file); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 358 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
| 359 | |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 360 | dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 361 | |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 362 | if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 363 | /* |
| 364 | * The directory was seek'ed to a senseless position or there |
| 365 | * are no more entries. |
| 366 | */ |
| 367 | return 0; |
| 368 | |
Artem Bityutskiy | 605c912 | 2013-06-28 14:15:15 +0300 | [diff] [blame] | 369 | if (file->f_version == 0) { |
| 370 | /* |
| 371 | * The file was seek'ed, which means that @file->private_data |
| 372 | * is now invalid. This may also be just the first |
| 373 | * 'ubifs_readdir()' invocation, in which case |
| 374 | * @file->private_data is NULL, and the below code is |
| 375 | * basically a no-op. |
| 376 | */ |
| 377 | kfree(file->private_data); |
| 378 | file->private_data = NULL; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * 'generic_file_llseek()' unconditionally sets @file->f_version to |
| 383 | * zero, and we use this for detecting whether the file was seek'ed. |
| 384 | */ |
| 385 | file->f_version = 1; |
| 386 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 387 | /* File positions 0 and 1 correspond to "." and ".." */ |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 388 | if (ctx->pos < 2) { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 389 | ubifs_assert(!file->private_data); |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 390 | if (!dir_emit_dots(file, ctx)) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 391 | return 0; |
| 392 | |
| 393 | /* Find the first entry in TNC and save it */ |
| 394 | lowest_dent_key(c, &key, dir->i_ino); |
| 395 | nm.name = NULL; |
| 396 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
| 397 | if (IS_ERR(dent)) { |
| 398 | err = PTR_ERR(dent); |
| 399 | goto out; |
| 400 | } |
| 401 | |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 402 | ctx->pos = key_hash_flash(c, &dent->key); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 403 | file->private_data = dent; |
| 404 | } |
| 405 | |
| 406 | dent = file->private_data; |
| 407 | if (!dent) { |
| 408 | /* |
| 409 | * The directory was seek'ed to and is now readdir'ed. |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 410 | * Find the entry corresponding to @ctx->pos or the closest one. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 411 | */ |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 412 | dent_key_init_hash(c, &key, dir->i_ino, ctx->pos); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 413 | nm.name = NULL; |
| 414 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
| 415 | if (IS_ERR(dent)) { |
| 416 | err = PTR_ERR(dent); |
| 417 | goto out; |
| 418 | } |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 419 | ctx->pos = key_hash_flash(c, &dent->key); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 420 | file->private_data = dent; |
| 421 | } |
| 422 | |
| 423 | while (1) { |
| 424 | dbg_gen("feed '%s', ino %llu, new f_pos %#x", |
Alexander Beregalov | 7424bac | 2008-09-17 22:09:41 +0400 | [diff] [blame] | 425 | dent->name, (unsigned long long)le64_to_cpu(dent->inum), |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 426 | key_hash_flash(c, &dent->key)); |
Harvey Harrison | 0ecb952 | 2008-10-24 10:52:57 -0700 | [diff] [blame] | 427 | ubifs_assert(le64_to_cpu(dent->ch.sqnum) > |
| 428 | ubifs_inode(dir)->creat_sqnum); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 429 | |
| 430 | nm.len = le16_to_cpu(dent->nlen); |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 431 | if (!dir_emit(ctx, dent->name, nm.len, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 432 | le64_to_cpu(dent->inum), |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 433 | vfs_dent_type(dent->type))) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 434 | return 0; |
| 435 | |
| 436 | /* Switch to the next entry */ |
| 437 | key_read(c, &dent->key, &key); |
| 438 | nm.name = dent->name; |
| 439 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
| 440 | if (IS_ERR(dent)) { |
| 441 | err = PTR_ERR(dent); |
| 442 | goto out; |
| 443 | } |
| 444 | |
| 445 | kfree(file->private_data); |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 446 | ctx->pos = key_hash_flash(c, &dent->key); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 447 | file->private_data = dent; |
| 448 | cond_resched(); |
| 449 | } |
| 450 | |
| 451 | out: |
Richard Weinberger | aeeb14f | 2015-10-12 23:35:36 +0200 | [diff] [blame] | 452 | kfree(file->private_data); |
| 453 | file->private_data = NULL; |
| 454 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 455 | if (err != -ENOENT) { |
Sheng Yong | 235c362 | 2015-03-20 10:39:42 +0000 | [diff] [blame] | 456 | ubifs_err(c, "cannot find next direntry, error %d", err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 457 | return err; |
| 458 | } |
| 459 | |
Artem Bityutskiy | 605c912 | 2013-06-28 14:15:15 +0300 | [diff] [blame] | 460 | /* 2 is a special value indicating that there are no more direntries */ |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 461 | ctx->pos = 2; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 462 | return 0; |
| 463 | } |
| 464 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 465 | /* Free saved readdir() state when the directory is closed */ |
| 466 | static int ubifs_dir_release(struct inode *dir, struct file *file) |
| 467 | { |
| 468 | kfree(file->private_data); |
| 469 | file->private_data = NULL; |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | /** |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 474 | * lock_2_inodes - a wrapper for locking two UBIFS inodes. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 475 | * @inode1: first inode |
| 476 | * @inode2: second inode |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 477 | * |
| 478 | * We do not implement any tricks to guarantee strict lock ordering, because |
| 479 | * VFS has already done it for us on the @i_mutex. So this is just a simple |
| 480 | * wrapper function. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 481 | */ |
| 482 | static void lock_2_inodes(struct inode *inode1, struct inode *inode2) |
| 483 | { |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 484 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
| 485 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 486 | } |
| 487 | |
| 488 | /** |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 489 | * unlock_2_inodes - a wrapper for unlocking two UBIFS inodes. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 490 | * @inode1: first inode |
| 491 | * @inode2: second inode |
| 492 | */ |
| 493 | static void unlock_2_inodes(struct inode *inode1, struct inode *inode2) |
| 494 | { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 495 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 496 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | static int ubifs_link(struct dentry *old_dentry, struct inode *dir, |
| 500 | struct dentry *dentry) |
| 501 | { |
| 502 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 503 | struct inode *inode = d_inode(old_dentry); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 504 | struct ubifs_inode *ui = ubifs_inode(inode); |
| 505 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
| 506 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
| 507 | struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2, |
Artem Bityutskiy | dab4b4d | 2008-07-24 14:52:45 +0300 | [diff] [blame] | 508 | .dirtied_ino_d = ALIGN(ui->data_len, 8) }; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 509 | |
| 510 | /* |
| 511 | * Budget request settings: new direntry, changing the target inode, |
| 512 | * changing the parent inode. |
| 513 | */ |
| 514 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 515 | dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu", |
| 516 | dentry, inode->i_ino, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 517 | inode->i_nlink, dir->i_ino); |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 518 | ubifs_assert(mutex_is_locked(&dir->i_mutex)); |
| 519 | ubifs_assert(mutex_is_locked(&inode->i_mutex)); |
Hunter Adrian | 8b3884a | 2009-05-14 06:32:30 +0200 | [diff] [blame] | 520 | |
Artem Bityutskiy | d808efb | 2011-05-31 18:14:38 +0300 | [diff] [blame] | 521 | err = dbg_check_synced_i_size(c, inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 522 | if (err) |
| 523 | return err; |
| 524 | |
| 525 | err = ubifs_budget_space(c, &req); |
| 526 | if (err) |
| 527 | return err; |
| 528 | |
| 529 | lock_2_inodes(dir, inode); |
| 530 | inc_nlink(inode); |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 531 | ihold(inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 532 | inode->i_ctime = ubifs_current_time(inode); |
| 533 | dir->i_size += sz_change; |
| 534 | dir_ui->ui_size = dir->i_size; |
| 535 | dir->i_mtime = dir->i_ctime = inode->i_ctime; |
| 536 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); |
| 537 | if (err) |
| 538 | goto out_cancel; |
| 539 | unlock_2_inodes(dir, inode); |
| 540 | |
| 541 | ubifs_release_budget(c, &req); |
| 542 | d_instantiate(dentry, inode); |
| 543 | return 0; |
| 544 | |
| 545 | out_cancel: |
| 546 | dir->i_size -= sz_change; |
| 547 | dir_ui->ui_size = dir->i_size; |
| 548 | drop_nlink(inode); |
| 549 | unlock_2_inodes(dir, inode); |
| 550 | ubifs_release_budget(c, &req); |
| 551 | iput(inode); |
| 552 | return err; |
| 553 | } |
| 554 | |
| 555 | static int ubifs_unlink(struct inode *dir, struct dentry *dentry) |
| 556 | { |
| 557 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 558 | struct inode *inode = d_inode(dentry); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 559 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
| 560 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
| 561 | int err, budgeted = 1; |
| 562 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
Artem Bityutskiy | c43be10 | 2012-02-07 10:58:51 +0200 | [diff] [blame] | 563 | unsigned int saved_nlink = inode->i_nlink; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 564 | |
| 565 | /* |
| 566 | * Budget request settings: deletion direntry, deletion inode (+1 for |
| 567 | * @dirtied_ino), changing the parent directory inode. If budgeting |
| 568 | * fails, go ahead anyway because we have extra space reserved for |
| 569 | * deletions. |
| 570 | */ |
| 571 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 572 | dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu", |
| 573 | dentry, inode->i_ino, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 574 | inode->i_nlink, dir->i_ino); |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 575 | ubifs_assert(mutex_is_locked(&dir->i_mutex)); |
| 576 | ubifs_assert(mutex_is_locked(&inode->i_mutex)); |
Artem Bityutskiy | d808efb | 2011-05-31 18:14:38 +0300 | [diff] [blame] | 577 | err = dbg_check_synced_i_size(c, inode); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 578 | if (err) |
| 579 | return err; |
| 580 | |
| 581 | err = ubifs_budget_space(c, &req); |
| 582 | if (err) { |
| 583 | if (err != -ENOSPC) |
| 584 | return err; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 585 | budgeted = 0; |
| 586 | } |
| 587 | |
| 588 | lock_2_inodes(dir, inode); |
| 589 | inode->i_ctime = ubifs_current_time(dir); |
| 590 | drop_nlink(inode); |
| 591 | dir->i_size -= sz_change; |
| 592 | dir_ui->ui_size = dir->i_size; |
| 593 | dir->i_mtime = dir->i_ctime = inode->i_ctime; |
| 594 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0); |
| 595 | if (err) |
| 596 | goto out_cancel; |
| 597 | unlock_2_inodes(dir, inode); |
| 598 | |
| 599 | if (budgeted) |
| 600 | ubifs_release_budget(c, &req); |
| 601 | else { |
| 602 | /* We've deleted something - clean the "no space" flags */ |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 603 | c->bi.nospace = c->bi.nospace_rp = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 604 | smp_wmb(); |
| 605 | } |
| 606 | return 0; |
| 607 | |
| 608 | out_cancel: |
| 609 | dir->i_size += sz_change; |
| 610 | dir_ui->ui_size = dir->i_size; |
Artem Bityutskiy | c43be10 | 2012-02-07 10:58:51 +0200 | [diff] [blame] | 611 | set_nlink(inode, saved_nlink); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 612 | unlock_2_inodes(dir, inode); |
| 613 | if (budgeted) |
| 614 | ubifs_release_budget(c, &req); |
| 615 | return err; |
| 616 | } |
| 617 | |
| 618 | /** |
| 619 | * check_dir_empty - check if a directory is empty or not. |
| 620 | * @c: UBIFS file-system description object |
| 621 | * @dir: VFS inode object of the directory to check |
| 622 | * |
| 623 | * This function checks if directory @dir is empty. Returns zero if the |
| 624 | * directory is empty, %-ENOTEMPTY if it is not, and other negative error codes |
| 625 | * in case of of errors. |
| 626 | */ |
| 627 | static int check_dir_empty(struct ubifs_info *c, struct inode *dir) |
| 628 | { |
| 629 | struct qstr nm = { .name = NULL }; |
| 630 | struct ubifs_dent_node *dent; |
| 631 | union ubifs_key key; |
| 632 | int err; |
| 633 | |
| 634 | lowest_dent_key(c, &key, dir->i_ino); |
| 635 | dent = ubifs_tnc_next_ent(c, &key, &nm); |
| 636 | if (IS_ERR(dent)) { |
| 637 | err = PTR_ERR(dent); |
| 638 | if (err == -ENOENT) |
| 639 | err = 0; |
| 640 | } else { |
| 641 | kfree(dent); |
| 642 | err = -ENOTEMPTY; |
| 643 | } |
| 644 | return err; |
| 645 | } |
| 646 | |
| 647 | static int ubifs_rmdir(struct inode *dir, struct dentry *dentry) |
| 648 | { |
| 649 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 650 | struct inode *inode = d_inode(dentry); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 651 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
| 652 | int err, budgeted = 1; |
| 653 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
| 654 | struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 }; |
| 655 | |
| 656 | /* |
| 657 | * Budget request settings: deletion direntry, deletion inode and |
| 658 | * changing the parent inode. If budgeting fails, go ahead anyway |
| 659 | * because we have extra space reserved for deletions. |
| 660 | */ |
| 661 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 662 | dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry, |
| 663 | inode->i_ino, dir->i_ino); |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 664 | ubifs_assert(mutex_is_locked(&dir->i_mutex)); |
| 665 | ubifs_assert(mutex_is_locked(&inode->i_mutex)); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 666 | err = check_dir_empty(c, d_inode(dentry)); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 667 | if (err) |
| 668 | return err; |
| 669 | |
| 670 | err = ubifs_budget_space(c, &req); |
| 671 | if (err) { |
| 672 | if (err != -ENOSPC) |
| 673 | return err; |
| 674 | budgeted = 0; |
| 675 | } |
| 676 | |
| 677 | lock_2_inodes(dir, inode); |
| 678 | inode->i_ctime = ubifs_current_time(dir); |
| 679 | clear_nlink(inode); |
| 680 | drop_nlink(dir); |
| 681 | dir->i_size -= sz_change; |
| 682 | dir_ui->ui_size = dir->i_size; |
| 683 | dir->i_mtime = dir->i_ctime = inode->i_ctime; |
| 684 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 1, 0); |
| 685 | if (err) |
| 686 | goto out_cancel; |
| 687 | unlock_2_inodes(dir, inode); |
| 688 | |
| 689 | if (budgeted) |
| 690 | ubifs_release_budget(c, &req); |
| 691 | else { |
| 692 | /* We've deleted something - clean the "no space" flags */ |
Artem Bityutskiy | b137545 | 2011-03-29 18:04:05 +0300 | [diff] [blame] | 693 | c->bi.nospace = c->bi.nospace_rp = 0; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 694 | smp_wmb(); |
| 695 | } |
| 696 | return 0; |
| 697 | |
| 698 | out_cancel: |
| 699 | dir->i_size += sz_change; |
| 700 | dir_ui->ui_size = dir->i_size; |
| 701 | inc_nlink(dir); |
Artem Bityutskiy | c43be10 | 2012-02-07 10:58:51 +0200 | [diff] [blame] | 702 | set_nlink(inode, 2); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 703 | unlock_2_inodes(dir, inode); |
| 704 | if (budgeted) |
| 705 | ubifs_release_budget(c, &req); |
| 706 | return err; |
| 707 | } |
| 708 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 709 | static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 710 | { |
| 711 | struct inode *inode; |
| 712 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
| 713 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
| 714 | int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
Artem Bityutskiy | 182854b | 2008-07-18 18:54:29 +0300 | [diff] [blame] | 715 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1 }; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 716 | |
| 717 | /* |
| 718 | * Budget request settings: new inode, new direntry and changing parent |
| 719 | * directory inode. |
| 720 | */ |
| 721 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 722 | dbg_gen("dent '%pd', mode %#hx in dir ino %lu", |
| 723 | dentry, mode, dir->i_ino); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 724 | |
| 725 | err = ubifs_budget_space(c, &req); |
| 726 | if (err) |
| 727 | return err; |
| 728 | |
| 729 | inode = ubifs_new_inode(c, dir, S_IFDIR | mode); |
| 730 | if (IS_ERR(inode)) { |
| 731 | err = PTR_ERR(inode); |
| 732 | goto out_budg; |
| 733 | } |
| 734 | |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 735 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
| 736 | if (err) |
Taesoo Kim | 9401a79 | 2015-03-25 09:53:37 +0100 | [diff] [blame] | 737 | goto out_inode; |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 738 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 739 | mutex_lock(&dir_ui->ui_mutex); |
| 740 | insert_inode_hash(inode); |
| 741 | inc_nlink(inode); |
| 742 | inc_nlink(dir); |
| 743 | dir->i_size += sz_change; |
| 744 | dir_ui->ui_size = dir->i_size; |
| 745 | dir->i_mtime = dir->i_ctime = inode->i_ctime; |
| 746 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); |
| 747 | if (err) { |
Sheng Yong | 235c362 | 2015-03-20 10:39:42 +0000 | [diff] [blame] | 748 | ubifs_err(c, "cannot create directory, error %d", err); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 749 | goto out_cancel; |
| 750 | } |
| 751 | mutex_unlock(&dir_ui->ui_mutex); |
| 752 | |
| 753 | ubifs_release_budget(c, &req); |
| 754 | d_instantiate(dentry, inode); |
| 755 | return 0; |
| 756 | |
| 757 | out_cancel: |
| 758 | dir->i_size -= sz_change; |
| 759 | dir_ui->ui_size = dir->i_size; |
| 760 | drop_nlink(dir); |
| 761 | mutex_unlock(&dir_ui->ui_mutex); |
Taesoo Kim | 9401a79 | 2015-03-25 09:53:37 +0100 | [diff] [blame] | 762 | out_inode: |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 763 | make_bad_inode(inode); |
| 764 | iput(inode); |
| 765 | out_budg: |
| 766 | ubifs_release_budget(c, &req); |
| 767 | return err; |
| 768 | } |
| 769 | |
| 770 | static int ubifs_mknod(struct inode *dir, struct dentry *dentry, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 771 | umode_t mode, dev_t rdev) |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 772 | { |
| 773 | struct inode *inode; |
| 774 | struct ubifs_inode *ui; |
| 775 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
| 776 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
| 777 | union ubifs_dev_desc *dev = NULL; |
| 778 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
| 779 | int err, devlen = 0; |
| 780 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
Artem Bityutskiy | dab4b4d | 2008-07-24 14:52:45 +0300 | [diff] [blame] | 781 | .new_ino_d = ALIGN(devlen, 8), |
| 782 | .dirtied_ino = 1 }; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 783 | |
| 784 | /* |
| 785 | * Budget request settings: new inode, new direntry and changing parent |
| 786 | * directory inode. |
| 787 | */ |
| 788 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 789 | dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 790 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 791 | if (S_ISBLK(mode) || S_ISCHR(mode)) { |
| 792 | dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS); |
| 793 | if (!dev) |
| 794 | return -ENOMEM; |
| 795 | devlen = ubifs_encode_dev(dev, rdev); |
| 796 | } |
| 797 | |
| 798 | err = ubifs_budget_space(c, &req); |
| 799 | if (err) { |
| 800 | kfree(dev); |
| 801 | return err; |
| 802 | } |
| 803 | |
| 804 | inode = ubifs_new_inode(c, dir, mode); |
| 805 | if (IS_ERR(inode)) { |
| 806 | kfree(dev); |
| 807 | err = PTR_ERR(inode); |
| 808 | goto out_budg; |
| 809 | } |
| 810 | |
| 811 | init_special_inode(inode, inode->i_mode, rdev); |
| 812 | inode->i_size = ubifs_inode(inode)->ui_size = devlen; |
| 813 | ui = ubifs_inode(inode); |
| 814 | ui->data = dev; |
| 815 | ui->data_len = devlen; |
| 816 | |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 817 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
| 818 | if (err) |
Taesoo Kim | 9401a79 | 2015-03-25 09:53:37 +0100 | [diff] [blame] | 819 | goto out_inode; |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 820 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 821 | mutex_lock(&dir_ui->ui_mutex); |
| 822 | dir->i_size += sz_change; |
| 823 | dir_ui->ui_size = dir->i_size; |
| 824 | dir->i_mtime = dir->i_ctime = inode->i_ctime; |
| 825 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); |
| 826 | if (err) |
| 827 | goto out_cancel; |
| 828 | mutex_unlock(&dir_ui->ui_mutex); |
| 829 | |
| 830 | ubifs_release_budget(c, &req); |
| 831 | insert_inode_hash(inode); |
| 832 | d_instantiate(dentry, inode); |
| 833 | return 0; |
| 834 | |
| 835 | out_cancel: |
| 836 | dir->i_size -= sz_change; |
| 837 | dir_ui->ui_size = dir->i_size; |
| 838 | mutex_unlock(&dir_ui->ui_mutex); |
Taesoo Kim | 9401a79 | 2015-03-25 09:53:37 +0100 | [diff] [blame] | 839 | out_inode: |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 840 | make_bad_inode(inode); |
| 841 | iput(inode); |
| 842 | out_budg: |
| 843 | ubifs_release_budget(c, &req); |
| 844 | return err; |
| 845 | } |
| 846 | |
| 847 | static int ubifs_symlink(struct inode *dir, struct dentry *dentry, |
| 848 | const char *symname) |
| 849 | { |
| 850 | struct inode *inode; |
| 851 | struct ubifs_inode *ui; |
| 852 | struct ubifs_inode *dir_ui = ubifs_inode(dir); |
| 853 | struct ubifs_info *c = dir->i_sb->s_fs_info; |
| 854 | int err, len = strlen(symname); |
| 855 | int sz_change = CALC_DENT_SIZE(dentry->d_name.len); |
| 856 | struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, |
Artem Bityutskiy | dab4b4d | 2008-07-24 14:52:45 +0300 | [diff] [blame] | 857 | .new_ino_d = ALIGN(len, 8), |
| 858 | .dirtied_ino = 1 }; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 859 | |
| 860 | /* |
| 861 | * Budget request settings: new inode, new direntry and changing parent |
| 862 | * directory inode. |
| 863 | */ |
| 864 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 865 | dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry, |
| 866 | symname, dir->i_ino); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 867 | |
| 868 | if (len > UBIFS_MAX_INO_DATA) |
| 869 | return -ENAMETOOLONG; |
| 870 | |
| 871 | err = ubifs_budget_space(c, &req); |
| 872 | if (err) |
| 873 | return err; |
| 874 | |
| 875 | inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO); |
| 876 | if (IS_ERR(inode)) { |
| 877 | err = PTR_ERR(inode); |
| 878 | goto out_budg; |
| 879 | } |
| 880 | |
| 881 | ui = ubifs_inode(inode); |
| 882 | ui->data = kmalloc(len + 1, GFP_NOFS); |
| 883 | if (!ui->data) { |
| 884 | err = -ENOMEM; |
| 885 | goto out_inode; |
| 886 | } |
| 887 | |
| 888 | memcpy(ui->data, symname, len); |
| 889 | ((char *)ui->data)[len] = '\0'; |
Al Viro | 0f301bd | 2015-05-02 10:35:42 -0400 | [diff] [blame] | 890 | inode->i_link = ui->data; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 891 | /* |
| 892 | * The terminating zero byte is not written to the flash media and it |
| 893 | * is put just to make later in-memory string processing simpler. Thus, |
| 894 | * data length is @len, not @len + %1. |
| 895 | */ |
| 896 | ui->data_len = len; |
| 897 | inode->i_size = ubifs_inode(inode)->ui_size = len; |
| 898 | |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 899 | err = ubifs_init_security(dir, inode, &dentry->d_name); |
| 900 | if (err) |
Taesoo Kim | 9401a79 | 2015-03-25 09:53:37 +0100 | [diff] [blame] | 901 | goto out_inode; |
Subodh Nijsure | d7f0b70 | 2014-10-31 13:50:30 -0500 | [diff] [blame] | 902 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 903 | mutex_lock(&dir_ui->ui_mutex); |
| 904 | dir->i_size += sz_change; |
| 905 | dir_ui->ui_size = dir->i_size; |
| 906 | dir->i_mtime = dir->i_ctime = inode->i_ctime; |
| 907 | err = ubifs_jnl_update(c, dir, &dentry->d_name, inode, 0, 0); |
| 908 | if (err) |
| 909 | goto out_cancel; |
| 910 | mutex_unlock(&dir_ui->ui_mutex); |
| 911 | |
| 912 | ubifs_release_budget(c, &req); |
| 913 | insert_inode_hash(inode); |
| 914 | d_instantiate(dentry, inode); |
| 915 | return 0; |
| 916 | |
| 917 | out_cancel: |
| 918 | dir->i_size -= sz_change; |
| 919 | dir_ui->ui_size = dir->i_size; |
| 920 | mutex_unlock(&dir_ui->ui_mutex); |
| 921 | out_inode: |
| 922 | make_bad_inode(inode); |
| 923 | iput(inode); |
| 924 | out_budg: |
| 925 | ubifs_release_budget(c, &req); |
| 926 | return err; |
| 927 | } |
| 928 | |
| 929 | /** |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 930 | * lock_3_inodes - a wrapper for locking three UBIFS inodes. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 931 | * @inode1: first inode |
| 932 | * @inode2: second inode |
| 933 | * @inode3: third inode |
| 934 | * |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 935 | * This function is used for 'ubifs_rename()' and @inode1 may be the same as |
| 936 | * @inode2 whereas @inode3 may be %NULL. |
| 937 | * |
| 938 | * We do not implement any tricks to guarantee strict lock ordering, because |
| 939 | * VFS has already done it for us on the @i_mutex. So this is just a simple |
| 940 | * wrapper function. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 941 | */ |
| 942 | static void lock_3_inodes(struct inode *inode1, struct inode *inode2, |
| 943 | struct inode *inode3) |
| 944 | { |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 945 | mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1); |
| 946 | if (inode2 != inode1) |
| 947 | mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2); |
| 948 | if (inode3) |
| 949 | mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 950 | } |
| 951 | |
| 952 | /** |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 953 | * unlock_3_inodes - a wrapper for unlocking three UBIFS inodes for rename. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 954 | * @inode1: first inode |
| 955 | * @inode2: second inode |
| 956 | * @inode3: third inode |
| 957 | */ |
| 958 | static void unlock_3_inodes(struct inode *inode1, struct inode *inode2, |
| 959 | struct inode *inode3) |
| 960 | { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 961 | if (inode3) |
| 962 | mutex_unlock(&ubifs_inode(inode3)->ui_mutex); |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 963 | if (inode1 != inode2) |
| 964 | mutex_unlock(&ubifs_inode(inode2)->ui_mutex); |
| 965 | mutex_unlock(&ubifs_inode(inode1)->ui_mutex); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 966 | } |
| 967 | |
| 968 | static int ubifs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 969 | struct inode *new_dir, struct dentry *new_dentry) |
| 970 | { |
| 971 | struct ubifs_info *c = old_dir->i_sb->s_fs_info; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 972 | struct inode *old_inode = d_inode(old_dentry); |
| 973 | struct inode *new_inode = d_inode(new_dentry); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 974 | struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode); |
| 975 | int err, release, sync = 0, move = (new_dir != old_dir); |
| 976 | int is_dir = S_ISDIR(old_inode->i_mode); |
| 977 | int unlink = !!new_inode; |
| 978 | int new_sz = CALC_DENT_SIZE(new_dentry->d_name.len); |
| 979 | int old_sz = CALC_DENT_SIZE(old_dentry->d_name.len); |
| 980 | struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1, |
| 981 | .dirtied_ino = 3 }; |
| 982 | struct ubifs_budget_req ino_req = { .dirtied_ino = 1, |
Artem Bityutskiy | dab4b4d | 2008-07-24 14:52:45 +0300 | [diff] [blame] | 983 | .dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) }; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 984 | struct timespec time; |
Alexandre Pereira da Silva | 782759b | 2012-06-25 17:47:49 -0300 | [diff] [blame] | 985 | unsigned int uninitialized_var(saved_nlink); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 986 | |
| 987 | /* |
| 988 | * Budget request settings: deletion direntry, new direntry, removing |
| 989 | * the old inode, and changing old and new parent directory inodes. |
| 990 | * |
| 991 | * However, this operation also marks the target inode as dirty and |
| 992 | * does not write it, so we allocate budget for the target inode |
| 993 | * separately. |
| 994 | */ |
| 995 | |
Al Viro | 4cb2a01 | 2013-09-16 10:58:53 -0400 | [diff] [blame] | 996 | dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu", |
| 997 | old_dentry, old_inode->i_ino, old_dir->i_ino, |
| 998 | new_dentry, new_dir->i_ino); |
Artem Bityutskiy | 82c1593 | 2009-01-20 16:46:02 +0200 | [diff] [blame] | 999 | ubifs_assert(mutex_is_locked(&old_dir->i_mutex)); |
| 1000 | ubifs_assert(mutex_is_locked(&new_dir->i_mutex)); |
| 1001 | if (unlink) |
| 1002 | ubifs_assert(mutex_is_locked(&new_inode->i_mutex)); |
| 1003 | |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1004 | |
| 1005 | if (unlink && is_dir) { |
| 1006 | err = check_dir_empty(c, new_inode); |
| 1007 | if (err) |
| 1008 | return err; |
| 1009 | } |
| 1010 | |
| 1011 | err = ubifs_budget_space(c, &req); |
| 1012 | if (err) |
| 1013 | return err; |
| 1014 | err = ubifs_budget_space(c, &ino_req); |
| 1015 | if (err) { |
| 1016 | ubifs_release_budget(c, &req); |
| 1017 | return err; |
| 1018 | } |
| 1019 | |
| 1020 | lock_3_inodes(old_dir, new_dir, new_inode); |
| 1021 | |
| 1022 | /* |
| 1023 | * Like most other Unix systems, set the @i_ctime for inodes on a |
| 1024 | * rename. |
| 1025 | */ |
| 1026 | time = ubifs_current_time(old_dir); |
| 1027 | old_inode->i_ctime = time; |
| 1028 | |
| 1029 | /* We must adjust parent link count when renaming directories */ |
| 1030 | if (is_dir) { |
| 1031 | if (move) { |
| 1032 | /* |
| 1033 | * @old_dir loses a link because we are moving |
| 1034 | * @old_inode to a different directory. |
| 1035 | */ |
| 1036 | drop_nlink(old_dir); |
| 1037 | /* |
| 1038 | * @new_dir only gains a link if we are not also |
| 1039 | * overwriting an existing directory. |
| 1040 | */ |
| 1041 | if (!unlink) |
| 1042 | inc_nlink(new_dir); |
| 1043 | } else { |
| 1044 | /* |
| 1045 | * @old_inode is not moving to a different directory, |
| 1046 | * but @old_dir still loses a link if we are |
| 1047 | * overwriting an existing directory. |
| 1048 | */ |
| 1049 | if (unlink) |
| 1050 | drop_nlink(old_dir); |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | old_dir->i_size -= old_sz; |
| 1055 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; |
| 1056 | old_dir->i_mtime = old_dir->i_ctime = time; |
| 1057 | new_dir->i_mtime = new_dir->i_ctime = time; |
| 1058 | |
| 1059 | /* |
| 1060 | * And finally, if we unlinked a direntry which happened to have the |
| 1061 | * same name as the moved direntry, we have to decrement @i_nlink of |
| 1062 | * the unlinked inode and change its ctime. |
| 1063 | */ |
| 1064 | if (unlink) { |
| 1065 | /* |
| 1066 | * Directories cannot have hard-links, so if this is a |
Artem Bityutskiy | c43be10 | 2012-02-07 10:58:51 +0200 | [diff] [blame] | 1067 | * directory, just clear @i_nlink. |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1068 | */ |
Artem Bityutskiy | c43be10 | 2012-02-07 10:58:51 +0200 | [diff] [blame] | 1069 | saved_nlink = new_inode->i_nlink; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1070 | if (is_dir) |
Artem Bityutskiy | c43be10 | 2012-02-07 10:58:51 +0200 | [diff] [blame] | 1071 | clear_nlink(new_inode); |
| 1072 | else |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1073 | drop_nlink(new_inode); |
| 1074 | new_inode->i_ctime = time; |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1075 | } else { |
| 1076 | new_dir->i_size += new_sz; |
| 1077 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; |
| 1078 | } |
| 1079 | |
| 1080 | /* |
| 1081 | * Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode |
| 1082 | * is dirty, because this will be done later on at the end of |
| 1083 | * 'ubifs_rename()'. |
| 1084 | */ |
| 1085 | if (IS_SYNC(old_inode)) { |
| 1086 | sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir); |
| 1087 | if (unlink && IS_SYNC(new_inode)) |
| 1088 | sync = 1; |
| 1089 | } |
| 1090 | err = ubifs_jnl_rename(c, old_dir, old_dentry, new_dir, new_dentry, |
| 1091 | sync); |
| 1092 | if (err) |
| 1093 | goto out_cancel; |
| 1094 | |
| 1095 | unlock_3_inodes(old_dir, new_dir, new_inode); |
| 1096 | ubifs_release_budget(c, &req); |
| 1097 | |
| 1098 | mutex_lock(&old_inode_ui->ui_mutex); |
| 1099 | release = old_inode_ui->dirty; |
| 1100 | mark_inode_dirty_sync(old_inode); |
| 1101 | mutex_unlock(&old_inode_ui->ui_mutex); |
| 1102 | |
| 1103 | if (release) |
| 1104 | ubifs_release_budget(c, &ino_req); |
| 1105 | if (IS_SYNC(old_inode)) |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 1106 | err = old_inode->i_sb->s_op->write_inode(old_inode, NULL); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1107 | return err; |
| 1108 | |
| 1109 | out_cancel: |
| 1110 | if (unlink) { |
Artem Bityutskiy | c43be10 | 2012-02-07 10:58:51 +0200 | [diff] [blame] | 1111 | set_nlink(new_inode, saved_nlink); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1112 | } else { |
| 1113 | new_dir->i_size -= new_sz; |
| 1114 | ubifs_inode(new_dir)->ui_size = new_dir->i_size; |
| 1115 | } |
| 1116 | old_dir->i_size += old_sz; |
| 1117 | ubifs_inode(old_dir)->ui_size = old_dir->i_size; |
| 1118 | if (is_dir) { |
| 1119 | if (move) { |
| 1120 | inc_nlink(old_dir); |
| 1121 | if (!unlink) |
| 1122 | drop_nlink(new_dir); |
| 1123 | } else { |
| 1124 | if (unlink) |
| 1125 | inc_nlink(old_dir); |
| 1126 | } |
| 1127 | } |
| 1128 | unlock_3_inodes(old_dir, new_dir, new_inode); |
| 1129 | ubifs_release_budget(c, &ino_req); |
| 1130 | ubifs_release_budget(c, &req); |
| 1131 | return err; |
| 1132 | } |
| 1133 | |
| 1134 | int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 1135 | struct kstat *stat) |
| 1136 | { |
| 1137 | loff_t size; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1138 | struct inode *inode = d_inode(dentry); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1139 | struct ubifs_inode *ui = ubifs_inode(inode); |
| 1140 | |
| 1141 | mutex_lock(&ui->ui_mutex); |
Al Viro | 6d42e7e | 2012-04-02 14:25:07 -0400 | [diff] [blame] | 1142 | generic_fillattr(inode, stat); |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1143 | stat->blksize = UBIFS_BLOCK_SIZE; |
| 1144 | stat->size = ui->ui_size; |
| 1145 | |
| 1146 | /* |
| 1147 | * Unfortunately, the 'stat()' system call was designed for block |
| 1148 | * device based file systems, and it is not appropriate for UBIFS, |
| 1149 | * because UBIFS does not have notion of "block". For example, it is |
| 1150 | * difficult to tell how many block a directory takes - it actually |
| 1151 | * takes less than 300 bytes, but we have to round it to block size, |
| 1152 | * which introduces large mistake. This makes utilities like 'du' to |
| 1153 | * report completely senseless numbers. This is the reason why UBIFS |
| 1154 | * goes the same way as JFFS2 - it reports zero blocks for everything |
| 1155 | * but regular files, which makes more sense than reporting completely |
| 1156 | * wrong sizes. |
| 1157 | */ |
| 1158 | if (S_ISREG(inode->i_mode)) { |
| 1159 | size = ui->xattr_size; |
| 1160 | size += stat->size; |
| 1161 | size = ALIGN(size, UBIFS_BLOCK_SIZE); |
| 1162 | /* |
| 1163 | * Note, user-space expects 512-byte blocks count irrespectively |
| 1164 | * of what was reported in @stat->size. |
| 1165 | */ |
| 1166 | stat->blocks = size >> 9; |
| 1167 | } else |
| 1168 | stat->blocks = 0; |
| 1169 | mutex_unlock(&ui->ui_mutex); |
| 1170 | return 0; |
| 1171 | } |
| 1172 | |
Artem Bityutskiy | e8b8156 | 2009-01-15 17:43:23 +0200 | [diff] [blame] | 1173 | const struct inode_operations ubifs_dir_inode_operations = { |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1174 | .lookup = ubifs_lookup, |
| 1175 | .create = ubifs_create, |
| 1176 | .link = ubifs_link, |
| 1177 | .symlink = ubifs_symlink, |
| 1178 | .unlink = ubifs_unlink, |
| 1179 | .mkdir = ubifs_mkdir, |
| 1180 | .rmdir = ubifs_rmdir, |
| 1181 | .mknod = ubifs_mknod, |
| 1182 | .rename = ubifs_rename, |
| 1183 | .setattr = ubifs_setattr, |
| 1184 | .getattr = ubifs_getattr, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1185 | .setxattr = ubifs_setxattr, |
| 1186 | .getxattr = ubifs_getxattr, |
| 1187 | .listxattr = ubifs_listxattr, |
| 1188 | .removexattr = ubifs_removexattr, |
Dongsheng Yang | 8c1c5f2 | 2015-11-07 12:46:11 +0800 | [diff] [blame^] | 1189 | #ifdef CONFIG_UBIFS_ATIME_SUPPORT |
| 1190 | .update_time = ubifs_update_time, |
| 1191 | #endif |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1192 | }; |
| 1193 | |
Artem Bityutskiy | e8b8156 | 2009-01-15 17:43:23 +0200 | [diff] [blame] | 1194 | const struct file_operations ubifs_dir_operations = { |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 1195 | .llseek = generic_file_llseek, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1196 | .release = ubifs_dir_release, |
| 1197 | .read = generic_read_dir, |
Al Viro | 01122e0 | 2013-05-16 01:14:46 -0400 | [diff] [blame] | 1198 | .iterate = ubifs_readdir, |
Artem Bityutskiy | 1e51764 | 2008-07-14 19:08:37 +0300 | [diff] [blame] | 1199 | .fsync = ubifs_fsync, |
| 1200 | .unlocked_ioctl = ubifs_ioctl, |
| 1201 | #ifdef CONFIG_COMPAT |
| 1202 | .compat_ioctl = ubifs_compat_ioctl, |
| 1203 | #endif |
| 1204 | }; |