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 17 #include "f2fs.h" 18 #include "node.h" 19 #include "xattr.h" 20 #include "acl.h" 21 #include <trace/events/f2fs.h> 22 23 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) 24 { 25 struct super_block *sb = dir->i_sb; 26 struct f2fs_sb_info *sbi = F2FS_SB(sb); 27 nid_t ino; 28 struct inode *inode; 29 bool nid_free = false; 30 int err, ilock; 31 32 inode = new_inode(sb); 33 if (!inode) 34 return ERR_PTR(-ENOMEM); 35 36 ilock = mutex_lock_op(sbi); 37 if (!alloc_nid(sbi, &ino)) { 38 mutex_unlock_op(sbi, ilock); 39 err = -ENOSPC; 40 goto fail; 41 } 42 mutex_unlock_op(sbi, ilock); 43 44 inode->i_uid = current_fsuid(); 45 46 if (dir->i_mode & S_ISGID) { 47 inode->i_gid = dir->i_gid; 48 if (S_ISDIR(mode)) 49 mode |= S_ISGID; 50 } else { 51 inode->i_gid = current_fsgid(); 52 } 53 54 inode->i_ino = ino; 55 inode->i_mode = mode; 56 inode->i_blocks = 0; 57 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; 58 inode->i_generation = sbi->s_next_generation++; 59 60 err = insert_inode_locked(inode); 61 if (err) { 62 err = -EINVAL; 63 nid_free = true; 64 goto out; 65 } 66 trace_f2fs_new_inode(inode, 0); 67 mark_inode_dirty(inode); 68 return inode; 69 70 out: 71 clear_nlink(inode); 72 unlock_new_inode(inode); 73 fail: 74 trace_f2fs_new_inode(inode, err); 75 make_bad_inode(inode); 76 iput(inode); 77 if (nid_free) 78 alloc_nid_failed(sbi, ino); 79 return ERR_PTR(err); 80 } 81 82 static int is_multimedia_file(const unsigned char *s, const char *sub) 83 { 84 size_t slen = strlen(s); 85 size_t sublen = strlen(sub); 86 int ret; 87 88 if (sublen > slen) 89 return 0; 90 91 ret = memcmp(s + slen - sublen, sub, sublen); 92 if (ret) { /* compare upper case */ 93 int i; 94 char upper_sub[8]; 95 for (i = 0; i < sublen && i < sizeof(upper_sub); i++) 96 upper_sub[i] = toupper(sub[i]); 97 return !memcmp(s + slen - sublen, upper_sub, sublen); 98 } 99 100 return !ret; 101 } 102 103 /* 104 * Set multimedia files as cold files for hot/cold data separation 105 */ 106 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, 107 const unsigned char *name) 108 { 109 int i; 110 __u8 (*extlist)[8] = sbi->raw_super->extension_list; 111 112 int count = le32_to_cpu(sbi->raw_super->extension_count); 113 for (i = 0; i < count; i++) { 114 if (is_multimedia_file(name, extlist[i])) { 115 file_set_cold(inode); 116 break; 117 } 118 } 119 } 120 121 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 122 bool excl) 123 { 124 struct super_block *sb = dir->i_sb; 125 struct f2fs_sb_info *sbi = F2FS_SB(sb); 126 struct inode *inode; 127 nid_t ino = 0; 128 int err, ilock; 129 130 f2fs_balance_fs(sbi); 131 132 inode = f2fs_new_inode(dir, mode); 133 if (IS_ERR(inode)) 134 return PTR_ERR(inode); 135 136 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) 137 set_cold_files(sbi, inode, dentry->d_name.name); 138 139 inode->i_op = &f2fs_file_inode_operations; 140 inode->i_fop = &f2fs_file_operations; 141 inode->i_mapping->a_ops = &f2fs_dblock_aops; 142 ino = inode->i_ino; 143 144 ilock = mutex_lock_op(sbi); 145 err = f2fs_add_link(dentry, inode); 146 mutex_unlock_op(sbi, ilock); 147 if (err) 148 goto out; 149 150 alloc_nid_done(sbi, ino); 151 152 d_instantiate(dentry, inode); 153 unlock_new_inode(inode); 154 return 0; 155 out: 156 clear_nlink(inode); 157 unlock_new_inode(inode); 158 make_bad_inode(inode); 159 iput(inode); 160 alloc_nid_failed(sbi, ino); 161 return err; 162 } 163 164 static int f2fs_link(struct dentry *old_dentry, struct inode *dir, 165 struct dentry *dentry) 166 { 167 struct inode *inode = old_dentry->d_inode; 168 struct super_block *sb = dir->i_sb; 169 struct f2fs_sb_info *sbi = F2FS_SB(sb); 170 int err, ilock; 171 172 f2fs_balance_fs(sbi); 173 174 inode->i_ctime = CURRENT_TIME; 175 ihold(inode); 176 177 set_inode_flag(F2FS_I(inode), FI_INC_LINK); 178 ilock = mutex_lock_op(sbi); 179 err = f2fs_add_link(dentry, inode); 180 mutex_unlock_op(sbi, ilock); 181 if (err) 182 goto out; 183 184 d_instantiate(dentry, inode); 185 return 0; 186 out: 187 clear_inode_flag(F2FS_I(inode), FI_INC_LINK); 188 iput(inode); 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(child->d_inode, &dotdot); 196 if (!ino) 197 return ERR_PTR(-ENOENT); 198 return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino)); 199 } 200 201 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, 202 unsigned int flags) 203 { 204 struct inode *inode = NULL; 205 struct f2fs_dir_entry *de; 206 struct page *page; 207 208 if (dentry->d_name.len > F2FS_NAME_LEN) 209 return ERR_PTR(-ENAMETOOLONG); 210 211 de = f2fs_find_entry(dir, &dentry->d_name, &page); 212 if (de) { 213 nid_t ino = le32_to_cpu(de->ino); 214 kunmap(page); 215 f2fs_put_page(page, 0); 216 217 inode = f2fs_iget(dir->i_sb, ino); 218 if (IS_ERR(inode)) 219 return ERR_CAST(inode); 220 } 221 222 return d_splice_alias(inode, dentry); 223 } 224 225 static int f2fs_unlink(struct inode *dir, struct dentry *dentry) 226 { 227 struct super_block *sb = dir->i_sb; 228 struct f2fs_sb_info *sbi = F2FS_SB(sb); 229 struct inode *inode = dentry->d_inode; 230 struct f2fs_dir_entry *de; 231 struct page *page; 232 int err = -ENOENT; 233 int ilock; 234 235 trace_f2fs_unlink_enter(dir, dentry); 236 f2fs_balance_fs(sbi); 237 238 de = f2fs_find_entry(dir, &dentry->d_name, &page); 239 if (!de) 240 goto fail; 241 242 err = check_orphan_space(sbi); 243 if (err) { 244 kunmap(page); 245 f2fs_put_page(page, 0); 246 goto fail; 247 } 248 249 ilock = mutex_lock_op(sbi); 250 f2fs_delete_entry(de, page, inode); 251 mutex_unlock_op(sbi, ilock); 252 253 /* In order to evict this inode, we set it dirty */ 254 mark_inode_dirty(inode); 255 fail: 256 trace_f2fs_unlink_exit(inode, err); 257 return err; 258 } 259 260 static int f2fs_symlink(struct inode *dir, struct dentry *dentry, 261 const char *symname) 262 { 263 struct super_block *sb = dir->i_sb; 264 struct f2fs_sb_info *sbi = F2FS_SB(sb); 265 struct inode *inode; 266 size_t symlen = strlen(symname) + 1; 267 int err, ilock; 268 269 f2fs_balance_fs(sbi); 270 271 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); 272 if (IS_ERR(inode)) 273 return PTR_ERR(inode); 274 275 inode->i_op = &f2fs_symlink_inode_operations; 276 inode->i_mapping->a_ops = &f2fs_dblock_aops; 277 278 ilock = mutex_lock_op(sbi); 279 err = f2fs_add_link(dentry, inode); 280 mutex_unlock_op(sbi, ilock); 281 if (err) 282 goto out; 283 284 err = page_symlink(inode, symname, symlen); 285 alloc_nid_done(sbi, inode->i_ino); 286 287 d_instantiate(dentry, inode); 288 unlock_new_inode(inode); 289 return err; 290 out: 291 clear_nlink(inode); 292 unlock_new_inode(inode); 293 make_bad_inode(inode); 294 iput(inode); 295 alloc_nid_failed(sbi, inode->i_ino); 296 return err; 297 } 298 299 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 300 { 301 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); 302 struct inode *inode; 303 int err, ilock; 304 305 f2fs_balance_fs(sbi); 306 307 inode = f2fs_new_inode(dir, S_IFDIR | mode); 308 if (IS_ERR(inode)) 309 return PTR_ERR(inode); 310 311 inode->i_op = &f2fs_dir_inode_operations; 312 inode->i_fop = &f2fs_dir_operations; 313 inode->i_mapping->a_ops = &f2fs_dblock_aops; 314 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO); 315 316 set_inode_flag(F2FS_I(inode), FI_INC_LINK); 317 ilock = mutex_lock_op(sbi); 318 err = f2fs_add_link(dentry, inode); 319 mutex_unlock_op(sbi, ilock); 320 if (err) 321 goto out_fail; 322 323 alloc_nid_done(sbi, inode->i_ino); 324 325 d_instantiate(dentry, inode); 326 unlock_new_inode(inode); 327 328 return 0; 329 330 out_fail: 331 clear_inode_flag(F2FS_I(inode), FI_INC_LINK); 332 clear_nlink(inode); 333 unlock_new_inode(inode); 334 make_bad_inode(inode); 335 iput(inode); 336 alloc_nid_failed(sbi, inode->i_ino); 337 return err; 338 } 339 340 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) 341 { 342 struct inode *inode = dentry->d_inode; 343 if (f2fs_empty_dir(inode)) 344 return f2fs_unlink(dir, dentry); 345 return -ENOTEMPTY; 346 } 347 348 static int f2fs_mknod(struct inode *dir, struct dentry *dentry, 349 umode_t mode, dev_t rdev) 350 { 351 struct super_block *sb = dir->i_sb; 352 struct f2fs_sb_info *sbi = F2FS_SB(sb); 353 struct inode *inode; 354 int err = 0; 355 int ilock; 356 357 if (!new_valid_dev(rdev)) 358 return -EINVAL; 359 360 f2fs_balance_fs(sbi); 361 362 inode = f2fs_new_inode(dir, mode); 363 if (IS_ERR(inode)) 364 return PTR_ERR(inode); 365 366 init_special_inode(inode, inode->i_mode, rdev); 367 inode->i_op = &f2fs_special_inode_operations; 368 369 ilock = mutex_lock_op(sbi); 370 err = f2fs_add_link(dentry, inode); 371 mutex_unlock_op(sbi, ilock); 372 if (err) 373 goto out; 374 375 alloc_nid_done(sbi, inode->i_ino); 376 d_instantiate(dentry, inode); 377 unlock_new_inode(inode); 378 return 0; 379 out: 380 clear_nlink(inode); 381 unlock_new_inode(inode); 382 make_bad_inode(inode); 383 iput(inode); 384 alloc_nid_failed(sbi, inode->i_ino); 385 return err; 386 } 387 388 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, 389 struct inode *new_dir, struct dentry *new_dentry) 390 { 391 struct super_block *sb = old_dir->i_sb; 392 struct f2fs_sb_info *sbi = F2FS_SB(sb); 393 struct inode *old_inode = old_dentry->d_inode; 394 struct inode *new_inode = new_dentry->d_inode; 395 struct page *old_dir_page; 396 struct page *old_page; 397 struct f2fs_dir_entry *old_dir_entry = NULL; 398 struct f2fs_dir_entry *old_entry; 399 struct f2fs_dir_entry *new_entry; 400 int err = -ENOENT, ilock = -1; 401 402 f2fs_balance_fs(sbi); 403 404 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); 405 if (!old_entry) 406 goto out; 407 408 if (S_ISDIR(old_inode->i_mode)) { 409 err = -EIO; 410 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); 411 if (!old_dir_entry) 412 goto out_old; 413 } 414 415 ilock = mutex_lock_op(sbi); 416 417 if (new_inode) { 418 struct page *new_page; 419 420 err = -ENOTEMPTY; 421 if (old_dir_entry && !f2fs_empty_dir(new_inode)) 422 goto out_dir; 423 424 err = -ENOENT; 425 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, 426 &new_page); 427 if (!new_entry) 428 goto out_dir; 429 430 f2fs_set_link(new_dir, new_entry, new_page, old_inode); 431 432 new_inode->i_ctime = CURRENT_TIME; 433 if (old_dir_entry) 434 drop_nlink(new_inode); 435 drop_nlink(new_inode); 436 if (!new_inode->i_nlink) 437 add_orphan_inode(sbi, new_inode->i_ino); 438 update_inode_page(new_inode); 439 } else { 440 err = f2fs_add_link(new_dentry, old_inode); 441 if (err) 442 goto out_dir; 443 444 if (old_dir_entry) { 445 inc_nlink(new_dir); 446 update_inode_page(new_dir); 447 } 448 } 449 450 old_inode->i_ctime = CURRENT_TIME; 451 mark_inode_dirty(old_inode); 452 453 f2fs_delete_entry(old_entry, old_page, NULL); 454 455 if (old_dir_entry) { 456 if (old_dir != new_dir) { 457 f2fs_set_link(old_inode, old_dir_entry, 458 old_dir_page, new_dir); 459 } else { 460 kunmap(old_dir_page); 461 f2fs_put_page(old_dir_page, 0); 462 } 463 drop_nlink(old_dir); 464 update_inode_page(old_dir); 465 } 466 467 mutex_unlock_op(sbi, ilock); 468 return 0; 469 470 out_dir: 471 if (old_dir_entry) { 472 kunmap(old_dir_page); 473 f2fs_put_page(old_dir_page, 0); 474 } 475 mutex_unlock_op(sbi, ilock); 476 out_old: 477 kunmap(old_page); 478 f2fs_put_page(old_page, 0); 479 out: 480 return err; 481 } 482 483 const struct inode_operations f2fs_dir_inode_operations = { 484 .create = f2fs_create, 485 .lookup = f2fs_lookup, 486 .link = f2fs_link, 487 .unlink = f2fs_unlink, 488 .symlink = f2fs_symlink, 489 .mkdir = f2fs_mkdir, 490 .rmdir = f2fs_rmdir, 491 .mknod = f2fs_mknod, 492 .rename = f2fs_rename, 493 .getattr = f2fs_getattr, 494 .setattr = f2fs_setattr, 495 .get_acl = f2fs_get_acl, 496 #ifdef CONFIG_F2FS_FS_XATTR 497 .setxattr = generic_setxattr, 498 .getxattr = generic_getxattr, 499 .listxattr = f2fs_listxattr, 500 .removexattr = generic_removexattr, 501 #endif 502 }; 503 504 const struct inode_operations f2fs_symlink_inode_operations = { 505 .readlink = generic_readlink, 506 .follow_link = page_follow_link_light, 507 .put_link = page_put_link, 508 .getattr = f2fs_getattr, 509 .setattr = f2fs_setattr, 510 #ifdef CONFIG_F2FS_FS_XATTR 511 .setxattr = generic_setxattr, 512 .getxattr = generic_getxattr, 513 .listxattr = f2fs_listxattr, 514 .removexattr = generic_removexattr, 515 #endif 516 }; 517 518 const struct inode_operations f2fs_special_inode_operations = { 519 .getattr = f2fs_getattr, 520 .setattr = f2fs_setattr, 521 .get_acl = f2fs_get_acl, 522 #ifdef CONFIG_F2FS_FS_XATTR 523 .setxattr = generic_setxattr, 524 .getxattr = generic_getxattr, 525 .listxattr = f2fs_listxattr, 526 .removexattr = generic_removexattr, 527 #endif 528 }; 529