fs/f2fs/namei.c

   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
  18 #include "f2fs.h"
  19 #include "node.h"
  20 #include "xattr.h"
  21 #include "acl.h"
  22 #include <trace/events/f2fs.h>
  23
  24 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  25 {
  26         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
  27         nid_t ino;
  28         struct inode *inode;
  29         bool nid_free = false;
  30         int err;
  31
  32         inode = new_inode(dir->i_sb);
  33         if (!inode)
  34                 return ERR_PTR(-ENOMEM);
  35
  36         f2fs_lock_op(sbi);
  37         if (!alloc_nid(sbi, &ino)) {
  38                 f2fs_unlock_op(sbi);
  39                 err = -ENOSPC;
  40                 goto fail;
  41         }
  42         f2fs_unlock_op(sbi);
  43
  44         inode_init_owner(inode, dir, mode);
  45
  46         inode->i_ino = ino;
  47         inode->i_blocks = 0;
  48         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
  49         inode->i_generation = sbi->s_next_generation++;
  50
  51         err = insert_inode_locked(inode);
  52         if (err) {
  53                 err = -EINVAL;
  54                 nid_free = true;
  55                 goto out;
  56         }
  57         trace_f2fs_new_inode(inode, 0);
  58         mark_inode_dirty(inode);
  59         return inode;
  60
  61 out:
  62         clear_nlink(inode);
  63         unlock_new_inode(inode);
  64 fail:
  65         trace_f2fs_new_inode(inode, err);
  66         make_bad_inode(inode);
  67         iput(inode);
  68         if (nid_free)
  69                 alloc_nid_failed(sbi, ino);
  70         return ERR_PTR(err);
  71 }
  72
  73 static int is_multimedia_file(const unsigned char *s, const char *sub)
  74 {
  75         size_t slen = strlen(s);
  76         size_t sublen = strlen(sub);
  77
  78         if (sublen > slen)
  79                 return 0;
  80
  81         return !strncasecmp(s + slen - sublen, sub, sublen);
  82 }
  83
  84 /*
  85  * Set multimedia files as cold files for hot/cold data separation
  86  */
  87 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
  88                 const unsigned char *name)
  89 {
  90         int i;
  91         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
  92
  93         int count = le32_to_cpu(sbi->raw_super->extension_count);
  94         for (i = 0; i < count; i++) {
  95                 if (is_multimedia_file(name, extlist[i])) {
  96                         file_set_cold(inode);
  97                         break;
  98                 }
  99         }
 100 }
 101
 102 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 103                                                 bool excl)
 104 {
 105         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 106         struct inode *inode;
 107         nid_t ino = 0;
 108         int err;
 109
 110         f2fs_balance_fs(sbi);
 111
 112         inode = f2fs_new_inode(dir, mode);
 113         if (IS_ERR(inode))
 114                 return PTR_ERR(inode);
 115
 116         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 117                 set_cold_files(sbi, inode, dentry->d_name.name);
 118
 119         inode->i_op = &f2fs_file_inode_operations;
 120         inode->i_fop = &f2fs_file_operations;
 121         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 122         ino = inode->i_ino;
 123
 124         f2fs_lock_op(sbi);
 125         err = f2fs_add_link(dentry, inode);
 126         f2fs_unlock_op(sbi);
 127         if (err)
 128                 goto out;
 129
 130         alloc_nid_done(sbi, ino);
 131
 132         d_instantiate(dentry, inode);
 133         unlock_new_inode(inode);
 134         return 0;
 135 out:
 136         clear_nlink(inode);
 137         unlock_new_inode(inode);
 138         make_bad_inode(inode);
 139         iput(inode);
 140         alloc_nid_failed(sbi, ino);
 141         return err;
 142 }
 143
 144 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 145                 struct dentry *dentry)
 146 {
 147         struct inode *inode = old_dentry->d_inode;
 148         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 149         int err;
 150
 151         f2fs_balance_fs(sbi);
 152
 153         inode->i_ctime = CURRENT_TIME;
 154         ihold(inode);
 155
 156         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 157         f2fs_lock_op(sbi);
 158         err = f2fs_add_link(dentry, inode);
 159         f2fs_unlock_op(sbi);
 160         if (err)
 161                 goto out;
 162
 163         d_instantiate(dentry, inode);
 164         return 0;
 165 out:
 166         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 167         iput(inode);
 168         return err;
 169 }
 170
 171 struct dentry *f2fs_get_parent(struct dentry *child)
 172 {
 173         struct qstr dotdot = QSTR_INIT("..", 2);
 174         unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
 175         if (!ino)
 176                 return ERR_PTR(-ENOENT);
 177         return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
 178 }
 179
 180 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 181                 unsigned int flags)
 182 {
 183         struct inode *inode = NULL;
 184         struct f2fs_dir_entry *de;
 185         struct page *page;
 186
 187         if (dentry->d_name.len > F2FS_NAME_LEN)
 188                 return ERR_PTR(-ENAMETOOLONG);
 189
 190         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 191         if (de) {
 192                 nid_t ino = le32_to_cpu(de->ino);
 193                 kunmap(page);
 194                 f2fs_put_page(page, 0);
 195
 196                 inode = f2fs_iget(dir->i_sb, ino);
 197                 if (IS_ERR(inode))
 198                         return ERR_CAST(inode);
 199
 200                 stat_inc_inline_inode(inode);
 201         }
 202
 203         return d_splice_alias(inode, dentry);
 204 }
 205
 206 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 207 {
 208         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 209         struct inode *inode = dentry->d_inode;
 210         struct f2fs_dir_entry *de;
 211         struct page *page;
 212         int err = -ENOENT;
 213
 214         trace_f2fs_unlink_enter(dir, dentry);
 215         f2fs_balance_fs(sbi);
 216
 217         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 218         if (!de)
 219                 goto fail;
 220
 221         f2fs_lock_op(sbi);
 222         err = acquire_orphan_inode(sbi);
 223         if (err) {
 224                 f2fs_unlock_op(sbi);
 225                 kunmap(page);
 226                 f2fs_put_page(page, 0);
 227                 goto fail;
 228         }
 229         f2fs_delete_entry(de, page, inode);
 230         f2fs_unlock_op(sbi);
 231
 232         /* In order to evict this inode,  we set it dirty */
 233         mark_inode_dirty(inode);
 234 fail:
 235         trace_f2fs_unlink_exit(inode, err);
 236         return err;
 237 }
 238
 239 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 240                                         const char *symname)
 241 {
 242         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 243         struct inode *inode;
 244         size_t symlen = strlen(symname) + 1;
 245         int err;
 246
 247         f2fs_balance_fs(sbi);
 248
 249         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 250         if (IS_ERR(inode))
 251                 return PTR_ERR(inode);
 252
 253         inode->i_op = &f2fs_symlink_inode_operations;
 254         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 255
 256         f2fs_lock_op(sbi);
 257         err = f2fs_add_link(dentry, inode);
 258         f2fs_unlock_op(sbi);
 259         if (err)
 260                 goto out;
 261
 262         err = page_symlink(inode, symname, symlen);
 263         alloc_nid_done(sbi, inode->i_ino);
 264
 265         d_instantiate(dentry, inode);
 266         unlock_new_inode(inode);
 267         return err;
 268 out:
 269         clear_nlink(inode);
 270         unlock_new_inode(inode);
 271         make_bad_inode(inode);
 272         iput(inode);
 273         alloc_nid_failed(sbi, inode->i_ino);
 274         return err;
 275 }
 276
 277 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 278 {
 279         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 280         struct inode *inode;
 281         int err;
 282
 283         f2fs_balance_fs(sbi);
 284
 285         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 286         if (IS_ERR(inode))
 287                 return PTR_ERR(inode);
 288
 289         inode->i_op = &f2fs_dir_inode_operations;
 290         inode->i_fop = &f2fs_dir_operations;
 291         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 292         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 293
 294         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 295         f2fs_lock_op(sbi);
 296         err = f2fs_add_link(dentry, inode);
 297         f2fs_unlock_op(sbi);
 298         if (err)
 299                 goto out_fail;
 300
 301         alloc_nid_done(sbi, inode->i_ino);
 302
 303         d_instantiate(dentry, inode);
 304         unlock_new_inode(inode);
 305
 306         return 0;
 307
 308 out_fail:
 309         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 310         clear_nlink(inode);
 311         unlock_new_inode(inode);
 312         make_bad_inode(inode);
 313         iput(inode);
 314         alloc_nid_failed(sbi, inode->i_ino);
 315         return err;
 316 }
 317
 318 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 319 {
 320         struct inode *inode = dentry->d_inode;
 321         if (f2fs_empty_dir(inode))
 322                 return f2fs_unlink(dir, dentry);
 323         return -ENOTEMPTY;
 324 }
 325
 326 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 327                                 umode_t mode, dev_t rdev)
 328 {
 329         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 330         struct inode *inode;
 331         int err = 0;
 332
 333         if (!new_valid_dev(rdev))
 334                 return -EINVAL;
 335
 336         f2fs_balance_fs(sbi);
 337
 338         inode = f2fs_new_inode(dir, mode);
 339         if (IS_ERR(inode))
 340                 return PTR_ERR(inode);
 341
 342         init_special_inode(inode, inode->i_mode, rdev);
 343         inode->i_op = &f2fs_special_inode_operations;
 344
 345         f2fs_lock_op(sbi);
 346         err = f2fs_add_link(dentry, inode);
 347         f2fs_unlock_op(sbi);
 348         if (err)
 349                 goto out;
 350
 351         alloc_nid_done(sbi, inode->i_ino);
 352         d_instantiate(dentry, inode);
 353         unlock_new_inode(inode);
 354         return 0;
 355 out:
 356         clear_nlink(inode);
 357         unlock_new_inode(inode);
 358         make_bad_inode(inode);
 359         iput(inode);
 360         alloc_nid_failed(sbi, inode->i_ino);
 361         return err;
 362 }
 363
 364 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 365                         struct inode *new_dir, struct dentry *new_dentry)
 366 {
 367         struct f2fs_sb_info *sbi = F2FS_SB(old_dir->i_sb);
 368         struct inode *old_inode = old_dentry->d_inode;
 369         struct inode *new_inode = new_dentry->d_inode;
 370         struct page *old_dir_page;
 371         struct page *old_page, *new_page;
 372         struct f2fs_dir_entry *old_dir_entry = NULL;
 373         struct f2fs_dir_entry *old_entry;
 374         struct f2fs_dir_entry *new_entry;
 375         int err = -ENOENT;
 376
 377         f2fs_balance_fs(sbi);
 378
 379         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 380         if (!old_entry)
 381                 goto out;
 382
 383         if (S_ISDIR(old_inode->i_mode)) {
 384                 err = -EIO;
 385                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 386                 if (!old_dir_entry)
 387                         goto out_old;
 388         }
 389
 390         if (new_inode) {
 391
 392                 err = -ENOTEMPTY;
 393                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 394                         goto out_dir;
 395
 396                 err = -ENOENT;
 397                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 398                                                 &new_page);
 399                 if (!new_entry)
 400                         goto out_dir;
 401
 402                 f2fs_lock_op(sbi);
 403
 404                 err = acquire_orphan_inode(sbi);
 405                 if (err)
 406                         goto put_out_dir;
 407
 408                 if (update_dent_inode(old_inode, &new_dentry->d_name)) {
 409                         release_orphan_inode(sbi);
 410                         goto put_out_dir;
 411                 }
 412
 413                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 414
 415                 new_inode->i_ctime = CURRENT_TIME;
 416                 down_write(&F2FS_I(new_inode)->i_sem);
 417                 if (old_dir_entry)
 418                         drop_nlink(new_inode);
 419                 drop_nlink(new_inode);
 420                 up_write(&F2FS_I(new_inode)->i_sem);
 421
 422                 mark_inode_dirty(new_inode);
 423
 424                 if (!new_inode->i_nlink)
 425                         add_orphan_inode(sbi, new_inode->i_ino);
 426                 else
 427                         release_orphan_inode(sbi);
 428
 429                 update_inode_page(old_inode);
 430                 update_inode_page(new_inode);
 431         } else {
 432                 f2fs_lock_op(sbi);
 433
 434                 err = f2fs_add_link(new_dentry, old_inode);
 435                 if (err) {
 436                         f2fs_unlock_op(sbi);
 437                         goto out_dir;
 438                 }
 439
 440                 if (old_dir_entry) {
 441                         inc_nlink(new_dir);
 442                         update_inode_page(new_dir);
 443                 }
 444         }
 445
 446         down_write(&F2FS_I(old_inode)->i_sem);
 447         file_lost_pino(old_inode);
 448         up_write(&F2FS_I(old_inode)->i_sem);
 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                         update_inode_page(old_inode);
 460                 } else {
 461                         kunmap(old_dir_page);
 462                         f2fs_put_page(old_dir_page, 0);
 463                 }
 464                 drop_nlink(old_dir);
 465                 mark_inode_dirty(old_dir);
 466                 update_inode_page(old_dir);
 467         }
 468
 469         f2fs_unlock_op(sbi);
 470         return 0;
 471
 472 put_out_dir:
 473         f2fs_unlock_op(sbi);
 474         kunmap(new_page);
 475         f2fs_put_page(new_page, 0);
 476 out_dir:
 477         if (old_dir_entry) {
 478                 kunmap(old_dir_page);
 479                 f2fs_put_page(old_dir_page, 0);
 480         }
 481 out_old:
 482         kunmap(old_page);
 483         f2fs_put_page(old_page, 0);
 484 out:
 485         return err;
 486 }
 487
 488 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 489 {
 490         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 491         struct inode *inode;
 492         int err;
 493
 494         inode = f2fs_new_inode(dir, mode);
 495         if (IS_ERR(inode))
 496                 return PTR_ERR(inode);
 497
 498         inode->i_op = &f2fs_file_inode_operations;
 499         inode->i_fop = &f2fs_file_operations;
 500         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 501
 502         f2fs_lock_op(sbi);
 503         err = acquire_orphan_inode(sbi);
 504         if (err)
 505                 goto out;
 506
 507         err = f2fs_do_tmpfile(inode, dir);
 508         if (err)
 509                 goto release_out;
 510
 511         /*
 512          * add this non-linked tmpfile to orphan list, in this way we could
 513          * remove all unused data of tmpfile after abnormal power-off.
 514          */
 515         add_orphan_inode(sbi, inode->i_ino);
 516         f2fs_unlock_op(sbi);
 517
 518         alloc_nid_done(sbi, inode->i_ino);
 519         d_tmpfile(dentry, inode);
 520         unlock_new_inode(inode);
 521         return 0;
 522
 523 release_out:
 524         release_orphan_inode(sbi);
 525 out:
 526         f2fs_unlock_op(sbi);
 527         clear_nlink(inode);
 528         unlock_new_inode(inode);
 529         make_bad_inode(inode);
 530         iput(inode);
 531         alloc_nid_failed(sbi, inode->i_ino);
 532         return err;
 533 }
 534
 535 const struct inode_operations f2fs_dir_inode_operations = {
 536         .create         = f2fs_create,
 537         .lookup         = f2fs_lookup,
 538         .link           = f2fs_link,
 539         .unlink         = f2fs_unlink,
 540         .symlink        = f2fs_symlink,
 541         .mkdir          = f2fs_mkdir,
 542         .rmdir          = f2fs_rmdir,
 543         .mknod          = f2fs_mknod,
 544         .rename         = f2fs_rename,
 545         .tmpfile        = f2fs_tmpfile,
 546         .getattr        = f2fs_getattr,
 547         .setattr        = f2fs_setattr,
 548         .get_acl        = f2fs_get_acl,
 549         .set_acl        = f2fs_set_acl,
 550 #ifdef CONFIG_F2FS_FS_XATTR
 551         .setxattr       = generic_setxattr,
 552         .getxattr       = generic_getxattr,
 553         .listxattr      = f2fs_listxattr,
 554         .removexattr    = generic_removexattr,
 555 #endif
 556 };
 557
 558 const struct inode_operations f2fs_symlink_inode_operations = {
 559         .readlink       = generic_readlink,
 560         .follow_link    = page_follow_link_light,
 561         .put_link       = page_put_link,
 562         .getattr        = f2fs_getattr,
 563         .setattr        = f2fs_setattr,
 564 #ifdef CONFIG_F2FS_FS_XATTR
 565         .setxattr       = generic_setxattr,
 566         .getxattr       = generic_getxattr,
 567         .listxattr      = f2fs_listxattr,
 568         .removexattr    = generic_removexattr,
 569 #endif
 570 };
 571
 572 const struct inode_operations f2fs_special_inode_operations = {
 573         .getattr        = f2fs_getattr,
 574         .setattr        = f2fs_setattr,
 575         .get_acl        = f2fs_get_acl,
 576         .set_acl        = f2fs_set_acl,
 577 #ifdef CONFIG_F2FS_FS_XATTR
 578         .setxattr       = generic_setxattr,
 579         .getxattr       = generic_getxattr,
 580         .listxattr      = f2fs_listxattr,
 581         .removexattr    = generic_removexattr,
 582 #endif
 583 };