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
  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;
  31
  32         inode = new_inode(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 super_block *sb = dir->i_sb;
 106         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 107         struct inode *inode;
 108         nid_t ino = 0;
 109         int err;
 110
 111         f2fs_balance_fs(sbi);
 112
 113         inode = f2fs_new_inode(dir, mode);
 114         if (IS_ERR(inode))
 115                 return PTR_ERR(inode);
 116
 117         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 118                 set_cold_files(sbi, inode, dentry->d_name.name);
 119
 120         inode->i_op = &f2fs_file_inode_operations;
 121         inode->i_fop = &f2fs_file_operations;
 122         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 123         ino = inode->i_ino;
 124
 125         f2fs_lock_op(sbi);
 126         err = f2fs_add_link(dentry, inode);
 127         f2fs_unlock_op(sbi);
 128         if (err)
 129                 goto out;
 130
 131         alloc_nid_done(sbi, ino);
 132
 133         d_instantiate(dentry, inode);
 134         unlock_new_inode(inode);
 135         return 0;
 136 out:
 137         clear_nlink(inode);
 138         unlock_new_inode(inode);
 139         make_bad_inode(inode);
 140         iput(inode);
 141         alloc_nid_failed(sbi, ino);
 142         return err;
 143 }
 144
 145 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 146                 struct dentry *dentry)
 147 {
 148         struct inode *inode = old_dentry->d_inode;
 149         struct super_block *sb = dir->i_sb;
 150         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 151         int err;
 152
 153         f2fs_balance_fs(sbi);
 154
 155         inode->i_ctime = CURRENT_TIME;
 156         ihold(inode);
 157
 158         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 159         f2fs_lock_op(sbi);
 160         err = f2fs_add_link(dentry, inode);
 161         f2fs_unlock_op(sbi);
 162         if (err)
 163                 goto out;
 164
 165         d_instantiate(dentry, inode);
 166         return 0;
 167 out:
 168         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 169         iput(inode);
 170         return err;
 171 }
 172
 173 struct dentry *f2fs_get_parent(struct dentry *child)
 174 {
 175         struct qstr dotdot = QSTR_INIT("..", 2);
 176         unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
 177         if (!ino)
 178                 return ERR_PTR(-ENOENT);
 179         return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
 180 }
 181
 182 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 183                 unsigned int flags)
 184 {
 185         struct inode *inode = NULL;
 186         struct f2fs_dir_entry *de;
 187         struct page *page;
 188
 189         if (dentry->d_name.len > F2FS_NAME_LEN)
 190                 return ERR_PTR(-ENAMETOOLONG);
 191
 192         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 193         if (de) {
 194                 nid_t ino = le32_to_cpu(de->ino);
 195                 kunmap(page);
 196                 f2fs_put_page(page, 0);
 197
 198                 inode = f2fs_iget(dir->i_sb, ino);
 199                 if (IS_ERR(inode))
 200                         return ERR_CAST(inode);
 201
 202                 stat_inc_inline_inode(inode);
 203         }
 204
 205         return d_splice_alias(inode, dentry);
 206 }
 207
 208 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 209 {
 210         struct super_block *sb = dir->i_sb;
 211         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 212         struct inode *inode = dentry->d_inode;
 213         struct f2fs_dir_entry *de;
 214         struct page *page;
 215         int err = -ENOENT;
 216
 217         trace_f2fs_unlink_enter(dir, dentry);
 218         f2fs_balance_fs(sbi);
 219
 220         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 221         if (!de)
 222                 goto fail;
 223
 224         f2fs_lock_op(sbi);
 225         err = acquire_orphan_inode(sbi);
 226         if (err) {
 227                 f2fs_unlock_op(sbi);
 228                 kunmap(page);
 229                 f2fs_put_page(page, 0);
 230                 goto fail;
 231         }
 232         f2fs_delete_entry(de, page, inode);
 233         f2fs_unlock_op(sbi);
 234
 235         /* In order to evict this inode,  we set it dirty */
 236         mark_inode_dirty(inode);
 237 fail:
 238         trace_f2fs_unlink_exit(inode, err);
 239         return err;
 240 }
 241
 242 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 243                                         const char *symname)
 244 {
 245         struct super_block *sb = dir->i_sb;
 246         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 247         struct inode *inode;
 248         size_t symlen = strlen(symname) + 1;
 249         int err;
 250
 251         f2fs_balance_fs(sbi);
 252
 253         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 254         if (IS_ERR(inode))
 255                 return PTR_ERR(inode);
 256
 257         inode->i_op = &f2fs_symlink_inode_operations;
 258         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 259
 260         f2fs_lock_op(sbi);
 261         err = f2fs_add_link(dentry, inode);
 262         f2fs_unlock_op(sbi);
 263         if (err)
 264                 goto out;
 265
 266         err = page_symlink(inode, symname, symlen);
 267         alloc_nid_done(sbi, inode->i_ino);
 268
 269         d_instantiate(dentry, inode);
 270         unlock_new_inode(inode);
 271         return err;
 272 out:
 273         clear_nlink(inode);
 274         unlock_new_inode(inode);
 275         make_bad_inode(inode);
 276         iput(inode);
 277         alloc_nid_failed(sbi, inode->i_ino);
 278         return err;
 279 }
 280
 281 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 282 {
 283         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 284         struct inode *inode;
 285         int err;
 286
 287         f2fs_balance_fs(sbi);
 288
 289         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 290         if (IS_ERR(inode))
 291                 return PTR_ERR(inode);
 292
 293         inode->i_op = &f2fs_dir_inode_operations;
 294         inode->i_fop = &f2fs_dir_operations;
 295         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 296         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 297
 298         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 299         f2fs_lock_op(sbi);
 300         err = f2fs_add_link(dentry, inode);
 301         f2fs_unlock_op(sbi);
 302         if (err)
 303                 goto out_fail;
 304
 305         alloc_nid_done(sbi, inode->i_ino);
 306
 307         d_instantiate(dentry, inode);
 308         unlock_new_inode(inode);
 309
 310         return 0;
 311
 312 out_fail:
 313         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 314         clear_nlink(inode);
 315         unlock_new_inode(inode);
 316         make_bad_inode(inode);
 317         iput(inode);
 318         alloc_nid_failed(sbi, inode->i_ino);
 319         return err;
 320 }
 321
 322 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 323 {
 324         struct inode *inode = dentry->d_inode;
 325         if (f2fs_empty_dir(inode))
 326                 return f2fs_unlink(dir, dentry);
 327         return -ENOTEMPTY;
 328 }
 329
 330 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 331                                 umode_t mode, dev_t rdev)
 332 {
 333         struct super_block *sb = dir->i_sb;
 334         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 335         struct inode *inode;
 336         int err = 0;
 337
 338         if (!new_valid_dev(rdev))
 339                 return -EINVAL;
 340
 341         f2fs_balance_fs(sbi);
 342
 343         inode = f2fs_new_inode(dir, mode);
 344         if (IS_ERR(inode))
 345                 return PTR_ERR(inode);
 346
 347         init_special_inode(inode, inode->i_mode, rdev);
 348         inode->i_op = &f2fs_special_inode_operations;
 349
 350         f2fs_lock_op(sbi);
 351         err = f2fs_add_link(dentry, inode);
 352         f2fs_unlock_op(sbi);
 353         if (err)
 354                 goto out;
 355
 356         alloc_nid_done(sbi, inode->i_ino);
 357         d_instantiate(dentry, inode);
 358         unlock_new_inode(inode);
 359         return 0;
 360 out:
 361         clear_nlink(inode);
 362         unlock_new_inode(inode);
 363         make_bad_inode(inode);
 364         iput(inode);
 365         alloc_nid_failed(sbi, inode->i_ino);
 366         return err;
 367 }
 368
 369 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 370                         struct inode *new_dir, struct dentry *new_dentry)
 371 {
 372         struct super_block *sb = old_dir->i_sb;
 373         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 374         struct inode *old_inode = old_dentry->d_inode;
 375         struct inode *new_inode = new_dentry->d_inode;
 376         struct page *old_dir_page;
 377         struct page *old_page, *new_page;
 378         struct f2fs_dir_entry *old_dir_entry = NULL;
 379         struct f2fs_dir_entry *old_entry;
 380         struct f2fs_dir_entry *new_entry;
 381         int err = -ENOENT;
 382
 383         f2fs_balance_fs(sbi);
 384
 385         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 386         if (!old_entry)
 387                 goto out;
 388
 389         if (S_ISDIR(old_inode->i_mode)) {
 390                 err = -EIO;
 391                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 392                 if (!old_dir_entry)
 393                         goto out_old;
 394         }
 395
 396         f2fs_lock_op(sbi);
 397
 398         if (new_inode) {
 399
 400                 err = -ENOTEMPTY;
 401                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 402                         goto out_dir;
 403
 404                 err = -ENOENT;
 405                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 406                                                 &new_page);
 407                 if (!new_entry)
 408                         goto out_dir;
 409
 410                 err = acquire_orphan_inode(sbi);
 411                 if (err)
 412                         goto put_out_dir;
 413
 414                 if (update_dent_inode(old_inode, &new_dentry->d_name)) {
 415                         release_orphan_inode(sbi);
 416                         goto put_out_dir;
 417                 }
 418
 419                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 420                 down_write(&F2FS_I(old_inode)->i_sem);
 421                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 422                 up_write(&F2FS_I(old_inode)->i_sem);
 423
 424                 new_inode->i_ctime = CURRENT_TIME;
 425                 down_write(&F2FS_I(new_inode)->i_sem);
 426                 if (old_dir_entry)
 427                         drop_nlink(new_inode);
 428                 drop_nlink(new_inode);
 429                 up_write(&F2FS_I(new_inode)->i_sem);
 430
 431                 mark_inode_dirty(new_inode);
 432
 433                 if (!new_inode->i_nlink)
 434                         add_orphan_inode(sbi, new_inode->i_ino);
 435                 else
 436                         release_orphan_inode(sbi);
 437
 438                 update_inode_page(old_inode);
 439                 update_inode_page(new_inode);
 440         } else {
 441                 err = f2fs_add_link(new_dentry, old_inode);
 442                 if (err)
 443                         goto out_dir;
 444
 445                 if (old_dir_entry) {
 446                         inc_nlink(new_dir);
 447                         update_inode_page(new_dir);
 448                 }
 449         }
 450
 451         old_inode->i_ctime = CURRENT_TIME;
 452         mark_inode_dirty(old_inode);
 453
 454         f2fs_delete_entry(old_entry, old_page, NULL);
 455
 456         if (old_dir_entry) {
 457                 if (old_dir != new_dir) {
 458                         f2fs_set_link(old_inode, old_dir_entry,
 459                                                 old_dir_page, new_dir);
 460                         down_write(&F2FS_I(old_inode)->i_sem);
 461                         F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 462                         up_write(&F2FS_I(old_inode)->i_sem);
 463                         update_inode_page(old_inode);
 464                 } else {
 465                         kunmap(old_dir_page);
 466                         f2fs_put_page(old_dir_page, 0);
 467                 }
 468                 drop_nlink(old_dir);
 469                 mark_inode_dirty(old_dir);
 470                 update_inode_page(old_dir);
 471         }
 472
 473         f2fs_unlock_op(sbi);
 474         return 0;
 475
 476 put_out_dir:
 477         f2fs_put_page(new_page, 1);
 478 out_dir:
 479         if (old_dir_entry) {
 480                 kunmap(old_dir_page);
 481                 f2fs_put_page(old_dir_page, 0);
 482         }
 483         f2fs_unlock_op(sbi);
 484 out_old:
 485         kunmap(old_page);
 486         f2fs_put_page(old_page, 0);
 487 out:
 488         return err;
 489 }
 490
 491 const struct inode_operations f2fs_dir_inode_operations = {
 492         .create         = f2fs_create,
 493         .lookup         = f2fs_lookup,
 494         .link           = f2fs_link,
 495         .unlink         = f2fs_unlink,
 496         .symlink        = f2fs_symlink,
 497         .mkdir          = f2fs_mkdir,
 498         .rmdir          = f2fs_rmdir,
 499         .mknod          = f2fs_mknod,
 500         .rename         = f2fs_rename,
 501         .getattr        = f2fs_getattr,
 502         .setattr        = f2fs_setattr,
 503         .get_acl        = f2fs_get_acl,
 504         .set_acl        = f2fs_set_acl,
 505 #ifdef CONFIG_F2FS_FS_XATTR
 506         .setxattr       = generic_setxattr,
 507         .getxattr       = generic_getxattr,
 508         .listxattr      = f2fs_listxattr,
 509         .removexattr    = generic_removexattr,
 510 #endif
 511 };
 512
 513 const struct inode_operations f2fs_symlink_inode_operations = {
 514         .readlink       = generic_readlink,
 515         .follow_link    = page_follow_link_light,
 516         .put_link       = page_put_link,
 517         .getattr        = f2fs_getattr,
 518         .setattr        = f2fs_setattr,
 519 #ifdef CONFIG_F2FS_FS_XATTR
 520         .setxattr       = generic_setxattr,
 521         .getxattr       = generic_getxattr,
 522         .listxattr      = f2fs_listxattr,
 523         .removexattr    = generic_removexattr,
 524 #endif
 525 };
 526
 527 const struct inode_operations f2fs_special_inode_operations = {
 528         .getattr        = f2fs_getattr,
 529         .setattr        = f2fs_setattr,
 530         .get_acl        = f2fs_get_acl,
 531         .set_acl        = f2fs_set_acl,
 532 #ifdef CONFIG_F2FS_FS_XATTR
 533         .setxattr       = generic_setxattr,
 534         .getxattr       = generic_getxattr,
 535         .listxattr      = f2fs_listxattr,
 536         .removexattr    = generic_removexattr,
 537 #endif
 538 };