| | 1 | /* |
| | 2 | * fs/f2fs/namei.c |
| | 3 | * |
| | 4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| | 5 | * http://www.samsung.com/ |
| | 6 | * |
| | 7 | * This program is free software; you can redistribute it and/or modify |
| | 8 | * it under the terms of the GNU General Public License version 2 as |
| | 9 | * published by the Free Software Foundation. |
| | 10 | */ |
| | 11 | #include <linux/fs.h> |
| | 12 | #include <linux/f2fs_fs.h> |
| | 13 | #include <linux/pagemap.h> |
| | 14 | #include <linux/sched.h> |
| | 15 | #include <linux/ctype.h> |
| | 16 | #include <linux/dcache.h> |
| | 17 | #include <linux/namei.h> |
| | 18 | |
| | 19 | #include "f2fs.h" |
| | 20 | #include "node.h" |
| | 21 | #include "xattr.h" |
| | 22 | #include "acl.h" |
| | 23 | #include <trace/events/f2fs.h> |
| | 24 | |
| | 25 | static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) |
| | 26 | { |
| | 27 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 28 | nid_t ino; |
| | 29 | struct inode *inode; |
| | 30 | bool nid_free = false; |
| | 31 | int err; |
| | 32 | |
| | 33 | inode = new_inode(dir->i_sb); |
| | 34 | if (!inode) |
| | 35 | return ERR_PTR(-ENOMEM); |
| | 36 | |
| | 37 | f2fs_lock_op(sbi); |
| | 38 | if (!alloc_nid(sbi, &ino)) { |
| | 39 | f2fs_unlock_op(sbi); |
| | 40 | err = -ENOSPC; |
| | 41 | goto fail; |
| | 42 | } |
| | 43 | f2fs_unlock_op(sbi); |
| | 44 | |
| | 45 | inode_init_owner(inode, dir, mode); |
| | 46 | |
| | 47 | inode->i_ino = ino; |
| | 48 | inode->i_blocks = 0; |
| | 49 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| | 50 | inode->i_generation = sbi->s_next_generation++; |
| | 51 | |
| | 52 | err = insert_inode_locked(inode); |
| | 53 | if (err) { |
| | 54 | err = -EINVAL; |
| | 55 | nid_free = true; |
| | 56 | goto out; |
| | 57 | } |
| | 58 | |
| | 59 | /* If the directory encrypted, then we should encrypt the inode. */ |
| | 60 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) |
| | 61 | f2fs_set_encrypted_inode(inode); |
| | 62 | |
| | 63 | if (f2fs_may_inline_data(inode)) |
| | 64 | set_inode_flag(F2FS_I(inode), FI_INLINE_DATA); |
| | 65 | if (f2fs_may_inline_dentry(inode)) |
| | 66 | set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY); |
| | 67 | |
| | 68 | stat_inc_inline_inode(inode); |
| | 69 | stat_inc_inline_dir(inode); |
| | 70 | |
| | 71 | trace_f2fs_new_inode(inode, 0); |
| | 72 | mark_inode_dirty(inode); |
| | 73 | return inode; |
| | 74 | |
| | 75 | out: |
| | 76 | clear_nlink(inode); |
| | 77 | unlock_new_inode(inode); |
| | 78 | fail: |
| | 79 | trace_f2fs_new_inode(inode, err); |
| | 80 | make_bad_inode(inode); |
| | 81 | iput(inode); |
| | 82 | if (nid_free) |
| | 83 | alloc_nid_failed(sbi, ino); |
| | 84 | return ERR_PTR(err); |
| | 85 | } |
| | 86 | |
| | 87 | static int is_multimedia_file(const unsigned char *s, const char *sub) |
| | 88 | { |
| | 89 | size_t slen = strlen(s); |
| | 90 | size_t sublen = strlen(sub); |
| | 91 | |
| | 92 | if (sublen > slen) |
| | 93 | return 0; |
| | 94 | |
| | 95 | return !strncasecmp(s + slen - sublen, sub, sublen); |
| | 96 | } |
| | 97 | |
| | 98 | /* |
| | 99 | * Set multimedia files as cold files for hot/cold data separation |
| | 100 | */ |
| | 101 | static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, |
| | 102 | const unsigned char *name) |
| | 103 | { |
| | 104 | int i; |
| | 105 | __u8 (*extlist)[8] = sbi->raw_super->extension_list; |
| | 106 | |
| | 107 | int count = le32_to_cpu(sbi->raw_super->extension_count); |
| | 108 | for (i = 0; i < count; i++) { |
| | 109 | if (is_multimedia_file(name, extlist[i])) { |
| | 110 | file_set_cold(inode); |
| | 111 | break; |
| | 112 | } |
| | 113 | } |
| | 114 | } |
| | 115 | |
| | 116 | static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| | 117 | bool excl) |
| | 118 | { |
| | 119 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 120 | struct inode *inode; |
| | 121 | nid_t ino = 0; |
| | 122 | int err; |
| | 123 | |
| | 124 | f2fs_balance_fs(sbi); |
| | 125 | |
| | 126 | inode = f2fs_new_inode(dir, mode); |
| | 127 | if (IS_ERR(inode)) |
| | 128 | return PTR_ERR(inode); |
| | 129 | |
| | 130 | if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) |
| | 131 | set_cold_files(sbi, inode, dentry->d_name.name); |
| | 132 | |
| | 133 | inode->i_op = &f2fs_file_inode_operations; |
| | 134 | inode->i_fop = &f2fs_file_operations; |
| | 135 | inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| | 136 | ino = inode->i_ino; |
| | 137 | |
| | 138 | f2fs_lock_op(sbi); |
| | 139 | err = f2fs_add_link(dentry, inode); |
| | 140 | if (err) |
| | 141 | goto out; |
| | 142 | f2fs_unlock_op(sbi); |
| | 143 | |
| | 144 | alloc_nid_done(sbi, ino); |
| | 145 | |
| | 146 | d_instantiate(dentry, inode); |
| | 147 | unlock_new_inode(inode); |
| | 148 | |
| | 149 | if (IS_DIRSYNC(dir)) |
| | 150 | f2fs_sync_fs(sbi->sb, 1); |
| | 151 | return 0; |
| | 152 | out: |
| | 153 | handle_failed_inode(inode); |
| | 154 | return err; |
| | 155 | } |
| | 156 | |
| | 157 | static int f2fs_link(struct dentry *old_dentry, struct inode *dir, |
| | 158 | struct dentry *dentry) |
| | 159 | { |
| | 160 | struct inode *inode = d_inode(old_dentry); |
| | 161 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 162 | int err; |
| | 163 | |
| | 164 | if (f2fs_encrypted_inode(dir) && |
| | 165 | !f2fs_is_child_context_consistent_with_parent(dir, inode)) |
| | 166 | return -EPERM; |
| | 167 | |
| | 168 | f2fs_balance_fs(sbi); |
| | 169 | |
| | 170 | inode->i_ctime = CURRENT_TIME; |
| | 171 | ihold(inode); |
| | 172 | |
| | 173 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| | 174 | f2fs_lock_op(sbi); |
| | 175 | err = f2fs_add_link(dentry, inode); |
| | 176 | if (err) |
| | 177 | goto out; |
| | 178 | f2fs_unlock_op(sbi); |
| | 179 | |
| | 180 | d_instantiate(dentry, inode); |
| | 181 | |
| | 182 | if (IS_DIRSYNC(dir)) |
| | 183 | f2fs_sync_fs(sbi->sb, 1); |
| | 184 | return 0; |
| | 185 | out: |
| | 186 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| | 187 | iput(inode); |
| | 188 | f2fs_unlock_op(sbi); |
| | 189 | return err; |
| | 190 | } |
| | 191 | |
| | 192 | struct dentry *f2fs_get_parent(struct dentry *child) |
| | 193 | { |
| | 194 | struct qstr dotdot = QSTR_INIT("..", 2); |
| | 195 | unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot); |
| | 196 | if (!ino) |
| | 197 | return ERR_PTR(-ENOENT); |
| | 198 | return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino)); |
| | 199 | } |
| | 200 | |
| | 201 | static int __recover_dot_dentries(struct inode *dir, nid_t pino) |
| | 202 | { |
| | 203 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 204 | struct qstr dot = QSTR_INIT(".", 1); |
| | 205 | struct qstr dotdot = QSTR_INIT("..", 2); |
| | 206 | struct f2fs_dir_entry *de; |
| | 207 | struct page *page; |
| | 208 | int err = 0; |
| | 209 | |
| | 210 | f2fs_lock_op(sbi); |
| | 211 | |
| | 212 | de = f2fs_find_entry(dir, &dot, &page); |
| | 213 | if (de) { |
| | 214 | f2fs_dentry_kunmap(dir, page); |
| | 215 | f2fs_put_page(page, 0); |
| | 216 | } else { |
| | 217 | err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR); |
| | 218 | if (err) |
| | 219 | goto out; |
| | 220 | } |
| | 221 | |
| | 222 | de = f2fs_find_entry(dir, &dotdot, &page); |
| | 223 | if (de) { |
| | 224 | f2fs_dentry_kunmap(dir, page); |
| | 225 | f2fs_put_page(page, 0); |
| | 226 | } else { |
| | 227 | err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR); |
| | 228 | } |
| | 229 | out: |
| | 230 | if (!err) { |
| | 231 | clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS); |
| | 232 | mark_inode_dirty(dir); |
| | 233 | } |
| | 234 | |
| | 235 | f2fs_unlock_op(sbi); |
| | 236 | return err; |
| | 237 | } |
| | 238 | |
| | 239 | static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, |
| | 240 | unsigned int flags) |
| | 241 | { |
| | 242 | struct inode *inode = NULL; |
| | 243 | struct f2fs_dir_entry *de; |
| | 244 | struct page *page; |
| | 245 | nid_t ino; |
| | 246 | int err = 0; |
| | 247 | |
| | 248 | if (dentry->d_name.len > F2FS_NAME_LEN) |
| | 249 | return ERR_PTR(-ENAMETOOLONG); |
| | 250 | |
| | 251 | de = f2fs_find_entry(dir, &dentry->d_name, &page); |
| | 252 | if (!de) |
| | 253 | return d_splice_alias(inode, dentry); |
| | 254 | |
| | 255 | ino = le32_to_cpu(de->ino); |
| | 256 | f2fs_dentry_kunmap(dir, page); |
| | 257 | f2fs_put_page(page, 0); |
| | 258 | |
| | 259 | inode = f2fs_iget(dir->i_sb, ino); |
| | 260 | if (IS_ERR(inode)) |
| | 261 | return ERR_CAST(inode); |
| | 262 | |
| | 263 | if (f2fs_has_inline_dots(inode)) { |
| | 264 | err = __recover_dot_dentries(inode, dir->i_ino); |
| | 265 | if (err) |
| | 266 | goto err_out; |
| | 267 | } |
| | 268 | return d_splice_alias(inode, dentry); |
| | 269 | |
| | 270 | err_out: |
| | 271 | iget_failed(inode); |
| | 272 | return ERR_PTR(err); |
| | 273 | } |
| | 274 | |
| | 275 | static int f2fs_unlink(struct inode *dir, struct dentry *dentry) |
| | 276 | { |
| | 277 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 278 | struct inode *inode = d_inode(dentry); |
| | 279 | struct f2fs_dir_entry *de; |
| | 280 | struct page *page; |
| | 281 | int err = -ENOENT; |
| | 282 | |
| | 283 | trace_f2fs_unlink_enter(dir, dentry); |
| | 284 | f2fs_balance_fs(sbi); |
| | 285 | |
| | 286 | de = f2fs_find_entry(dir, &dentry->d_name, &page); |
| | 287 | if (!de) |
| | 288 | goto fail; |
| | 289 | |
| | 290 | f2fs_lock_op(sbi); |
| | 291 | err = acquire_orphan_inode(sbi); |
| | 292 | if (err) { |
| | 293 | f2fs_unlock_op(sbi); |
| | 294 | f2fs_dentry_kunmap(dir, page); |
| | 295 | f2fs_put_page(page, 0); |
| | 296 | goto fail; |
| | 297 | } |
| | 298 | f2fs_delete_entry(de, page, dir, inode); |
| | 299 | f2fs_unlock_op(sbi); |
| | 300 | |
| | 301 | /* In order to evict this inode, we set it dirty */ |
| | 302 | mark_inode_dirty(inode); |
| | 303 | |
| | 304 | if (IS_DIRSYNC(dir)) |
| | 305 | f2fs_sync_fs(sbi->sb, 1); |
| | 306 | fail: |
| | 307 | trace_f2fs_unlink_exit(inode, err); |
| | 308 | return err; |
| | 309 | } |
| | 310 | |
| | 311 | static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| | 312 | { |
| | 313 | struct page *page = page_follow_link_light(dentry, nd); |
| | 314 | |
| | 315 | if (IS_ERR_OR_NULL(page)) |
| | 316 | return page; |
| | 317 | |
| | 318 | /* this is broken symlink case */ |
| | 319 | if (*nd_get_link(nd) == 0) { |
| | 320 | page_put_link(dentry, nd, page); |
| | 321 | return ERR_PTR(-ENOENT); |
| | 322 | } |
| | 323 | return page; |
| | 324 | } |
| | 325 | |
| | 326 | static int f2fs_symlink(struct inode *dir, struct dentry *dentry, |
| | 327 | const char *symname) |
| | 328 | { |
| | 329 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 330 | struct inode *inode; |
| | 331 | size_t len = strlen(symname); |
| | 332 | size_t p_len; |
| | 333 | char *p_str; |
| | 334 | struct f2fs_str disk_link = FSTR_INIT(NULL, 0); |
| | 335 | struct f2fs_encrypted_symlink_data *sd = NULL; |
| | 336 | int err; |
| | 337 | |
| | 338 | if (len > dir->i_sb->s_blocksize) |
| | 339 | return -ENAMETOOLONG; |
| | 340 | |
| | 341 | f2fs_balance_fs(sbi); |
| | 342 | |
| | 343 | inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
| | 344 | if (IS_ERR(inode)) |
| | 345 | return PTR_ERR(inode); |
| | 346 | |
| | 347 | if (f2fs_encrypted_inode(inode)) |
| | 348 | inode->i_op = &f2fs_encrypted_symlink_inode_operations; |
| | 349 | else |
| | 350 | inode->i_op = &f2fs_symlink_inode_operations; |
| | 351 | inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| | 352 | |
| | 353 | f2fs_lock_op(sbi); |
| | 354 | err = f2fs_add_link(dentry, inode); |
| | 355 | if (err) |
| | 356 | goto out; |
| | 357 | f2fs_unlock_op(sbi); |
| | 358 | alloc_nid_done(sbi, inode->i_ino); |
| | 359 | |
| | 360 | if (f2fs_encrypted_inode(dir)) { |
| | 361 | struct qstr istr = QSTR_INIT(symname, len); |
| | 362 | |
| | 363 | err = f2fs_inherit_context(dir, inode, NULL); |
| | 364 | if (err) |
| | 365 | goto err_out; |
| | 366 | |
| | 367 | err = f2fs_setup_fname_crypto(inode); |
| | 368 | if (err) |
| | 369 | goto err_out; |
| | 370 | |
| | 371 | err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link); |
| | 372 | if (err) |
| | 373 | goto err_out; |
| | 374 | |
| | 375 | err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link); |
| | 376 | if (err < 0) |
| | 377 | goto err_out; |
| | 378 | |
| | 379 | p_len = encrypted_symlink_data_len(disk_link.len) + 1; |
| | 380 | |
| | 381 | if (p_len > dir->i_sb->s_blocksize) { |
| | 382 | err = -ENAMETOOLONG; |
| | 383 | goto err_out; |
| | 384 | } |
| | 385 | |
| | 386 | sd = kzalloc(p_len, GFP_NOFS); |
| | 387 | if (!sd) { |
| | 388 | err = -ENOMEM; |
| | 389 | goto err_out; |
| | 390 | } |
| | 391 | memcpy(sd->encrypted_path, disk_link.name, disk_link.len); |
| | 392 | sd->len = cpu_to_le16(disk_link.len); |
| | 393 | p_str = (char *)sd; |
| | 394 | } else { |
| | 395 | p_len = len + 1; |
| | 396 | p_str = (char *)symname; |
| | 397 | } |
| | 398 | |
| | 399 | err = page_symlink(inode, p_str, p_len); |
| | 400 | |
| | 401 | err_out: |
| | 402 | d_instantiate(dentry, inode); |
| | 403 | unlock_new_inode(inode); |
| | 404 | |
| | 405 | /* |
| | 406 | * Let's flush symlink data in order to avoid broken symlink as much as |
| | 407 | * possible. Nevertheless, fsyncing is the best way, but there is no |
| | 408 | * way to get a file descriptor in order to flush that. |
| | 409 | * |
| | 410 | * Note that, it needs to do dir->fsync to make this recoverable. |
| | 411 | * If the symlink path is stored into inline_data, there is no |
| | 412 | * performance regression. |
| | 413 | */ |
| | 414 | if (!err) |
| | 415 | filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1); |
| | 416 | |
| | 417 | if (IS_DIRSYNC(dir)) |
| | 418 | f2fs_sync_fs(sbi->sb, 1); |
| | 419 | |
| | 420 | kfree(sd); |
| | 421 | f2fs_fname_crypto_free_buffer(&disk_link); |
| | 422 | return err; |
| | 423 | out: |
| | 424 | handle_failed_inode(inode); |
| | 425 | return err; |
| | 426 | } |
| | 427 | |
| | 428 | static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| | 429 | { |
| | 430 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 431 | struct inode *inode; |
| | 432 | int err; |
| | 433 | |
| | 434 | f2fs_balance_fs(sbi); |
| | 435 | |
| | 436 | inode = f2fs_new_inode(dir, S_IFDIR | mode); |
| | 437 | if (IS_ERR(inode)) |
| | 438 | return PTR_ERR(inode); |
| | 439 | |
| | 440 | inode->i_op = &f2fs_dir_inode_operations; |
| | 441 | inode->i_fop = &f2fs_dir_operations; |
| | 442 | inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| | 443 | mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO); |
| | 444 | |
| | 445 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| | 446 | f2fs_lock_op(sbi); |
| | 447 | err = f2fs_add_link(dentry, inode); |
| | 448 | if (err) |
| | 449 | goto out_fail; |
| | 450 | f2fs_unlock_op(sbi); |
| | 451 | |
| | 452 | alloc_nid_done(sbi, inode->i_ino); |
| | 453 | |
| | 454 | d_instantiate(dentry, inode); |
| | 455 | unlock_new_inode(inode); |
| | 456 | |
| | 457 | if (IS_DIRSYNC(dir)) |
| | 458 | f2fs_sync_fs(sbi->sb, 1); |
| | 459 | return 0; |
| | 460 | |
| | 461 | out_fail: |
| | 462 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); |
| | 463 | handle_failed_inode(inode); |
| | 464 | return err; |
| | 465 | } |
| | 466 | |
| | 467 | static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) |
| | 468 | { |
| | 469 | struct inode *inode = d_inode(dentry); |
| | 470 | if (f2fs_empty_dir(inode)) |
| | 471 | return f2fs_unlink(dir, dentry); |
| | 472 | return -ENOTEMPTY; |
| | 473 | } |
| | 474 | |
| | 475 | static int f2fs_mknod(struct inode *dir, struct dentry *dentry, |
| | 476 | umode_t mode, dev_t rdev) |
| | 477 | { |
| | 478 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 479 | struct inode *inode; |
| | 480 | int err = 0; |
| | 481 | |
| | 482 | if (!new_valid_dev(rdev)) |
| | 483 | return -EINVAL; |
| | 484 | |
| | 485 | f2fs_balance_fs(sbi); |
| | 486 | |
| | 487 | inode = f2fs_new_inode(dir, mode); |
| | 488 | if (IS_ERR(inode)) |
| | 489 | return PTR_ERR(inode); |
| | 490 | |
| | 491 | init_special_inode(inode, inode->i_mode, rdev); |
| | 492 | inode->i_op = &f2fs_special_inode_operations; |
| | 493 | |
| | 494 | f2fs_lock_op(sbi); |
| | 495 | err = f2fs_add_link(dentry, inode); |
| | 496 | if (err) |
| | 497 | goto out; |
| | 498 | f2fs_unlock_op(sbi); |
| | 499 | |
| | 500 | alloc_nid_done(sbi, inode->i_ino); |
| | 501 | |
| | 502 | d_instantiate(dentry, inode); |
| | 503 | unlock_new_inode(inode); |
| | 504 | |
| | 505 | if (IS_DIRSYNC(dir)) |
| | 506 | f2fs_sync_fs(sbi->sb, 1); |
| | 507 | return 0; |
| | 508 | out: |
| | 509 | handle_failed_inode(inode); |
| | 510 | return err; |
| | 511 | } |
| | 512 | |
| | 513 | static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| | 514 | struct inode *new_dir, struct dentry *new_dentry) |
| | 515 | { |
| | 516 | struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); |
| | 517 | struct inode *old_inode = d_inode(old_dentry); |
| | 518 | struct inode *new_inode = d_inode(new_dentry); |
| | 519 | struct page *old_dir_page; |
| | 520 | struct page *old_page, *new_page; |
| | 521 | struct f2fs_dir_entry *old_dir_entry = NULL; |
| | 522 | struct f2fs_dir_entry *old_entry; |
| | 523 | struct f2fs_dir_entry *new_entry; |
| | 524 | int err = -ENOENT; |
| | 525 | |
| | 526 | if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) && |
| | 527 | !f2fs_is_child_context_consistent_with_parent(new_dir, |
| | 528 | old_inode)) { |
| | 529 | err = -EPERM; |
| | 530 | goto out; |
| | 531 | } |
| | 532 | |
| | 533 | f2fs_balance_fs(sbi); |
| | 534 | |
| | 535 | old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
| | 536 | if (!old_entry) |
| | 537 | goto out; |
| | 538 | |
| | 539 | if (S_ISDIR(old_inode->i_mode)) { |
| | 540 | err = -EIO; |
| | 541 | old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); |
| | 542 | if (!old_dir_entry) |
| | 543 | goto out_old; |
| | 544 | } |
| | 545 | |
| | 546 | if (new_inode) { |
| | 547 | |
| | 548 | err = -ENOTEMPTY; |
| | 549 | if (old_dir_entry && !f2fs_empty_dir(new_inode)) |
| | 550 | goto out_dir; |
| | 551 | |
| | 552 | err = -ENOENT; |
| | 553 | new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, |
| | 554 | &new_page); |
| | 555 | if (!new_entry) |
| | 556 | goto out_dir; |
| | 557 | |
| | 558 | f2fs_lock_op(sbi); |
| | 559 | |
| | 560 | err = acquire_orphan_inode(sbi); |
| | 561 | if (err) |
| | 562 | goto put_out_dir; |
| | 563 | |
| | 564 | if (update_dent_inode(old_inode, new_inode, |
| | 565 | &new_dentry->d_name)) { |
| | 566 | release_orphan_inode(sbi); |
| | 567 | goto put_out_dir; |
| | 568 | } |
| | 569 | |
| | 570 | f2fs_set_link(new_dir, new_entry, new_page, old_inode); |
| | 571 | |
| | 572 | new_inode->i_ctime = CURRENT_TIME; |
| | 573 | down_write(&F2FS_I(new_inode)->i_sem); |
| | 574 | if (old_dir_entry) |
| | 575 | drop_nlink(new_inode); |
| | 576 | drop_nlink(new_inode); |
| | 577 | up_write(&F2FS_I(new_inode)->i_sem); |
| | 578 | |
| | 579 | mark_inode_dirty(new_inode); |
| | 580 | |
| | 581 | if (!new_inode->i_nlink) |
| | 582 | add_orphan_inode(sbi, new_inode->i_ino); |
| | 583 | else |
| | 584 | release_orphan_inode(sbi); |
| | 585 | |
| | 586 | update_inode_page(old_inode); |
| | 587 | update_inode_page(new_inode); |
| | 588 | } else { |
| | 589 | f2fs_lock_op(sbi); |
| | 590 | |
| | 591 | err = f2fs_add_link(new_dentry, old_inode); |
| | 592 | if (err) { |
| | 593 | f2fs_unlock_op(sbi); |
| | 594 | goto out_dir; |
| | 595 | } |
| | 596 | |
| | 597 | if (old_dir_entry) { |
| | 598 | inc_nlink(new_dir); |
| | 599 | update_inode_page(new_dir); |
| | 600 | } |
| | 601 | } |
| | 602 | |
| | 603 | down_write(&F2FS_I(old_inode)->i_sem); |
| | 604 | file_lost_pino(old_inode); |
| | 605 | if (new_inode && file_enc_name(new_inode)) |
| | 606 | file_set_enc_name(old_inode); |
| | 607 | up_write(&F2FS_I(old_inode)->i_sem); |
| | 608 | |
| | 609 | old_inode->i_ctime = CURRENT_TIME; |
| | 610 | mark_inode_dirty(old_inode); |
| | 611 | |
| | 612 | f2fs_delete_entry(old_entry, old_page, old_dir, NULL); |
| | 613 | |
| | 614 | if (old_dir_entry) { |
| | 615 | if (old_dir != new_dir) { |
| | 616 | f2fs_set_link(old_inode, old_dir_entry, |
| | 617 | old_dir_page, new_dir); |
| | 618 | update_inode_page(old_inode); |
| | 619 | } else { |
| | 620 | f2fs_dentry_kunmap(old_inode, old_dir_page); |
| | 621 | f2fs_put_page(old_dir_page, 0); |
| | 622 | } |
| | 623 | drop_nlink(old_dir); |
| | 624 | mark_inode_dirty(old_dir); |
| | 625 | update_inode_page(old_dir); |
| | 626 | } |
| | 627 | |
| | 628 | f2fs_unlock_op(sbi); |
| | 629 | |
| | 630 | if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) |
| | 631 | f2fs_sync_fs(sbi->sb, 1); |
| | 632 | return 0; |
| | 633 | |
| | 634 | put_out_dir: |
| | 635 | f2fs_unlock_op(sbi); |
| | 636 | f2fs_dentry_kunmap(new_dir, new_page); |
| | 637 | f2fs_put_page(new_page, 0); |
| | 638 | out_dir: |
| | 639 | if (old_dir_entry) { |
| | 640 | f2fs_dentry_kunmap(old_inode, old_dir_page); |
| | 641 | f2fs_put_page(old_dir_page, 0); |
| | 642 | } |
| | 643 | out_old: |
| | 644 | f2fs_dentry_kunmap(old_dir, old_page); |
| | 645 | f2fs_put_page(old_page, 0); |
| | 646 | out: |
| | 647 | return err; |
| | 648 | } |
| | 649 | |
| | 650 | static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, |
| | 651 | struct inode *new_dir, struct dentry *new_dentry) |
| | 652 | { |
| | 653 | struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); |
| | 654 | struct inode *old_inode = d_inode(old_dentry); |
| | 655 | struct inode *new_inode = d_inode(new_dentry); |
| | 656 | struct page *old_dir_page, *new_dir_page; |
| | 657 | struct page *old_page, *new_page; |
| | 658 | struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; |
| | 659 | struct f2fs_dir_entry *old_entry, *new_entry; |
| | 660 | int old_nlink = 0, new_nlink = 0; |
| | 661 | int err = -ENOENT; |
| | 662 | |
| | 663 | f2fs_balance_fs(sbi); |
| | 664 | |
| | 665 | old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
| | 666 | if (!old_entry) |
| | 667 | goto out; |
| | 668 | |
| | 669 | new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
| | 670 | if (!new_entry) |
| | 671 | goto out_old; |
| | 672 | |
| | 673 | /* prepare for updating ".." directory entry info later */ |
| | 674 | if (old_dir != new_dir) { |
| | 675 | if (S_ISDIR(old_inode->i_mode)) { |
| | 676 | err = -EIO; |
| | 677 | old_dir_entry = f2fs_parent_dir(old_inode, |
| | 678 | &old_dir_page); |
| | 679 | if (!old_dir_entry) |
| | 680 | goto out_new; |
| | 681 | } |
| | 682 | |
| | 683 | if (S_ISDIR(new_inode->i_mode)) { |
| | 684 | err = -EIO; |
| | 685 | new_dir_entry = f2fs_parent_dir(new_inode, |
| | 686 | &new_dir_page); |
| | 687 | if (!new_dir_entry) |
| | 688 | goto out_old_dir; |
| | 689 | } |
| | 690 | } |
| | 691 | |
| | 692 | /* |
| | 693 | * If cross rename between file and directory those are not |
| | 694 | * in the same directory, we will inc nlink of file's parent |
| | 695 | * later, so we should check upper boundary of its nlink. |
| | 696 | */ |
| | 697 | if ((!old_dir_entry || !new_dir_entry) && |
| | 698 | old_dir_entry != new_dir_entry) { |
| | 699 | old_nlink = old_dir_entry ? -1 : 1; |
| | 700 | new_nlink = -old_nlink; |
| | 701 | err = -EMLINK; |
| | 702 | if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) || |
| | 703 | (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX)) |
| | 704 | goto out_new_dir; |
| | 705 | } |
| | 706 | |
| | 707 | f2fs_lock_op(sbi); |
| | 708 | |
| | 709 | err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name); |
| | 710 | if (err) |
| | 711 | goto out_unlock; |
| | 712 | if (file_enc_name(new_inode)) |
| | 713 | file_set_enc_name(old_inode); |
| | 714 | |
| | 715 | err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name); |
| | 716 | if (err) |
| | 717 | goto out_undo; |
| | 718 | if (file_enc_name(old_inode)) |
| | 719 | file_set_enc_name(new_inode); |
| | 720 | |
| | 721 | /* update ".." directory entry info of old dentry */ |
| | 722 | if (old_dir_entry) |
| | 723 | f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); |
| | 724 | |
| | 725 | /* update ".." directory entry info of new dentry */ |
| | 726 | if (new_dir_entry) |
| | 727 | f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); |
| | 728 | |
| | 729 | /* update directory entry info of old dir inode */ |
| | 730 | f2fs_set_link(old_dir, old_entry, old_page, new_inode); |
| | 731 | |
| | 732 | down_write(&F2FS_I(old_inode)->i_sem); |
| | 733 | file_lost_pino(old_inode); |
| | 734 | up_write(&F2FS_I(old_inode)->i_sem); |
| | 735 | |
| | 736 | update_inode_page(old_inode); |
| | 737 | |
| | 738 | old_dir->i_ctime = CURRENT_TIME; |
| | 739 | if (old_nlink) { |
| | 740 | down_write(&F2FS_I(old_dir)->i_sem); |
| | 741 | if (old_nlink < 0) |
| | 742 | drop_nlink(old_dir); |
| | 743 | else |
| | 744 | inc_nlink(old_dir); |
| | 745 | up_write(&F2FS_I(old_dir)->i_sem); |
| | 746 | } |
| | 747 | mark_inode_dirty(old_dir); |
| | 748 | update_inode_page(old_dir); |
| | 749 | |
| | 750 | /* update directory entry info of new dir inode */ |
| | 751 | f2fs_set_link(new_dir, new_entry, new_page, old_inode); |
| | 752 | |
| | 753 | down_write(&F2FS_I(new_inode)->i_sem); |
| | 754 | file_lost_pino(new_inode); |
| | 755 | up_write(&F2FS_I(new_inode)->i_sem); |
| | 756 | |
| | 757 | update_inode_page(new_inode); |
| | 758 | |
| | 759 | new_dir->i_ctime = CURRENT_TIME; |
| | 760 | if (new_nlink) { |
| | 761 | down_write(&F2FS_I(new_dir)->i_sem); |
| | 762 | if (new_nlink < 0) |
| | 763 | drop_nlink(new_dir); |
| | 764 | else |
| | 765 | inc_nlink(new_dir); |
| | 766 | up_write(&F2FS_I(new_dir)->i_sem); |
| | 767 | } |
| | 768 | mark_inode_dirty(new_dir); |
| | 769 | update_inode_page(new_dir); |
| | 770 | |
| | 771 | f2fs_unlock_op(sbi); |
| | 772 | |
| | 773 | if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) |
| | 774 | f2fs_sync_fs(sbi->sb, 1); |
| | 775 | return 0; |
| | 776 | out_undo: |
| | 777 | /* |
| | 778 | * Still we may fail to recover name info of f2fs_inode here |
| | 779 | * Drop it, once its name is set as encrypted |
| | 780 | */ |
| | 781 | update_dent_inode(old_inode, old_inode, &old_dentry->d_name); |
| | 782 | out_unlock: |
| | 783 | f2fs_unlock_op(sbi); |
| | 784 | out_new_dir: |
| | 785 | if (new_dir_entry) { |
| | 786 | f2fs_dentry_kunmap(new_inode, new_dir_page); |
| | 787 | f2fs_put_page(new_dir_page, 0); |
| | 788 | } |
| | 789 | out_old_dir: |
| | 790 | if (old_dir_entry) { |
| | 791 | f2fs_dentry_kunmap(old_inode, old_dir_page); |
| | 792 | f2fs_put_page(old_dir_page, 0); |
| | 793 | } |
| | 794 | out_new: |
| | 795 | f2fs_dentry_kunmap(new_dir, new_page); |
| | 796 | f2fs_put_page(new_page, 0); |
| | 797 | out_old: |
| | 798 | f2fs_dentry_kunmap(old_dir, old_page); |
| | 799 | f2fs_put_page(old_page, 0); |
| | 800 | out: |
| | 801 | return err; |
| | 802 | } |
| | 803 | |
| | 804 | static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry, |
| | 805 | struct inode *new_dir, struct dentry *new_dentry, |
| | 806 | unsigned int flags) |
| | 807 | { |
| | 808 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) |
| | 809 | return -EINVAL; |
| | 810 | |
| | 811 | if (flags & RENAME_EXCHANGE) { |
| | 812 | return f2fs_cross_rename(old_dir, old_dentry, |
| | 813 | new_dir, new_dentry); |
| | 814 | } |
| | 815 | /* |
| | 816 | * VFS has already handled the new dentry existence case, |
| | 817 | * here, we just deal with "RENAME_NOREPLACE" as regular rename. |
| | 818 | */ |
| | 819 | return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry); |
| | 820 | } |
| | 821 | |
| | 822 | static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
| | 823 | { |
| | 824 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); |
| | 825 | struct inode *inode; |
| | 826 | int err; |
| | 827 | |
| | 828 | inode = f2fs_new_inode(dir, mode); |
| | 829 | if (IS_ERR(inode)) |
| | 830 | return PTR_ERR(inode); |
| | 831 | |
| | 832 | inode->i_op = &f2fs_file_inode_operations; |
| | 833 | inode->i_fop = &f2fs_file_operations; |
| | 834 | inode->i_mapping->a_ops = &f2fs_dblock_aops; |
| | 835 | |
| | 836 | f2fs_lock_op(sbi); |
| | 837 | err = acquire_orphan_inode(sbi); |
| | 838 | if (err) |
| | 839 | goto out; |
| | 840 | |
| | 841 | err = f2fs_do_tmpfile(inode, dir); |
| | 842 | if (err) |
| | 843 | goto release_out; |
| | 844 | |
| | 845 | /* |
| | 846 | * add this non-linked tmpfile to orphan list, in this way we could |
| | 847 | * remove all unused data of tmpfile after abnormal power-off. |
| | 848 | */ |
| | 849 | add_orphan_inode(sbi, inode->i_ino); |
| | 850 | f2fs_unlock_op(sbi); |
| | 851 | |
| | 852 | alloc_nid_done(sbi, inode->i_ino); |
| | 853 | |
| | 854 | d_tmpfile(dentry, inode); |
| | 855 | unlock_new_inode(inode); |
| | 856 | return 0; |
| | 857 | |
| | 858 | release_out: |
| | 859 | release_orphan_inode(sbi); |
| | 860 | out: |
| | 861 | handle_failed_inode(inode); |
| | 862 | return err; |
| | 863 | } |
| | 864 | |
| | 865 | #ifdef CONFIG_F2FS_FS_ENCRYPTION |
| | 866 | static void *f2fs_encrypted_follow_link(struct dentry *dentry, |
| | 867 | struct nameidata *nd) |
| | 868 | { |
| | 869 | struct page *cpage = NULL; |
| | 870 | char *caddr, *paddr = NULL; |
| | 871 | struct f2fs_str cstr; |
| | 872 | struct f2fs_str pstr = FSTR_INIT(NULL, 0); |
| | 873 | struct inode *inode = d_inode(dentry); |
| | 874 | struct f2fs_encrypted_symlink_data *sd; |
| | 875 | loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1); |
| | 876 | u32 max_size = inode->i_sb->s_blocksize; |
| | 877 | int res; |
| | 878 | |
| | 879 | res = f2fs_setup_fname_crypto(inode); |
| | 880 | if (res) |
| | 881 | return ERR_PTR(res); |
| | 882 | |
| | 883 | cpage = read_mapping_page(inode->i_mapping, 0, NULL); |
| | 884 | if (IS_ERR(cpage)) |
| | 885 | return cpage; |
| | 886 | caddr = kmap(cpage); |
| | 887 | caddr[size] = 0; |
| | 888 | |
| | 889 | /* Symlink is encrypted */ |
| | 890 | sd = (struct f2fs_encrypted_symlink_data *)caddr; |
| | 891 | cstr.name = sd->encrypted_path; |
| | 892 | cstr.len = le16_to_cpu(sd->len); |
| | 893 | |
| | 894 | /* this is broken symlink case */ |
| | 895 | if (cstr.name[0] == 0 && cstr.len == 0) { |
| | 896 | res = -ENOENT; |
| | 897 | goto errout; |
| | 898 | } |
| | 899 | |
| | 900 | if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) > |
| | 901 | max_size) { |
| | 902 | /* Symlink data on the disk is corrupted */ |
| | 903 | res = -EIO; |
| | 904 | goto errout; |
| | 905 | } |
| | 906 | res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr); |
| | 907 | if (res) |
| | 908 | goto errout; |
| | 909 | |
| | 910 | res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr); |
| | 911 | if (res < 0) |
| | 912 | goto errout; |
| | 913 | |
| | 914 | paddr = pstr.name; |
| | 915 | |
| | 916 | /* Null-terminate the name */ |
| | 917 | paddr[res] = '\0'; |
| | 918 | nd_set_link(nd, paddr); |
| | 919 | |
| | 920 | kunmap(cpage); |
| | 921 | page_cache_release(cpage); |
| | 922 | return NULL; |
| | 923 | errout: |
| | 924 | f2fs_fname_crypto_free_buffer(&pstr); |
| | 925 | kunmap(cpage); |
| | 926 | page_cache_release(cpage); |
| | 927 | return ERR_PTR(res); |
| | 928 | } |
| | 929 | |
| | 930 | const struct inode_operations f2fs_encrypted_symlink_inode_operations = { |
| | 931 | .readlink = generic_readlink, |
| | 932 | .follow_link = f2fs_encrypted_follow_link, |
| | 933 | .put_link = kfree_put_link, |
| | 934 | .getattr = f2fs_getattr, |
| | 935 | .setattr = f2fs_setattr, |
| | 936 | .setxattr = generic_setxattr, |
| | 937 | .getxattr = generic_getxattr, |
| | 938 | .listxattr = f2fs_listxattr, |
| | 939 | .removexattr = generic_removexattr, |
| | 940 | }; |
| | 941 | #endif |
| | 942 | |
| | 943 | const struct inode_operations f2fs_dir_inode_operations = { |
| | 944 | .create = f2fs_create, |
| | 945 | .lookup = f2fs_lookup, |
| | 946 | .link = f2fs_link, |
| | 947 | .unlink = f2fs_unlink, |
| | 948 | .symlink = f2fs_symlink, |
| | 949 | .mkdir = f2fs_mkdir, |
| | 950 | .rmdir = f2fs_rmdir, |
| | 951 | .mknod = f2fs_mknod, |
| | 952 | .rename2 = f2fs_rename2, |
| | 953 | .tmpfile = f2fs_tmpfile, |
| | 954 | .getattr = f2fs_getattr, |
| | 955 | .setattr = f2fs_setattr, |
| | 956 | .get_acl = f2fs_get_acl, |
| | 957 | .set_acl = f2fs_set_acl, |
| | 958 | #ifdef CONFIG_F2FS_FS_XATTR |
| | 959 | .setxattr = generic_setxattr, |
| | 960 | .getxattr = generic_getxattr, |
| | 961 | .listxattr = f2fs_listxattr, |
| | 962 | .removexattr = generic_removexattr, |
| | 963 | #endif |
| | 964 | }; |
| | 965 | |
| | 966 | const struct inode_operations f2fs_symlink_inode_operations = { |
| | 967 | .readlink = generic_readlink, |
| | 968 | .follow_link = f2fs_follow_link, |
| | 969 | .put_link = page_put_link, |
| | 970 | .getattr = f2fs_getattr, |
| | 971 | .setattr = f2fs_setattr, |
| | 972 | #ifdef CONFIG_F2FS_FS_XATTR |
| | 973 | .setxattr = generic_setxattr, |
| | 974 | .getxattr = generic_getxattr, |
| | 975 | .listxattr = f2fs_listxattr, |
| | 976 | .removexattr = generic_removexattr, |
| | 977 | #endif |
| | 978 | }; |
| | 979 | |
| | 980 | const struct inode_operations f2fs_special_inode_operations = { |
| | 981 | .getattr = f2fs_getattr, |
| | 982 | .setattr = f2fs_setattr, |
| | 983 | .get_acl = f2fs_get_acl, |
| | 984 | .set_acl = f2fs_set_acl, |
| | 985 | #ifdef CONFIG_F2FS_FS_XATTR |
| | 986 | .setxattr = generic_setxattr, |
| | 987 | .getxattr = generic_getxattr, |
| | 988 | .listxattr = f2fs_listxattr, |
| | 989 | .removexattr = generic_removexattr, |
| | 990 | #endif |
| | 991 | }; |
projects / mirror_ubuntu-artful-kernel.git / blame_incremental