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->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
  87         if (sublen > slen)
  88                 return 0;
  89
  90         return !strncasecmp(s + slen - sublen, sub, sublen);
  91 }
  92
  93 /*
  94  * Set multimedia files as cold files for hot/cold data separation
  95  */
  96 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
  97                 const unsigned char *name)
  98 {
  99         int i;
 100         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 101
 102         int count = le32_to_cpu(sbi->raw_super->extension_count);
 103         for (i = 0; i < count; i++) {
 104                 if (is_multimedia_file(name, extlist[i])) {
 105                         file_set_cold(inode);
 106                         break;
 107                 }
 108         }
 109 }
 110
 111 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 112                                                 bool excl)
 113 {
 114         struct super_block *sb = dir->i_sb;
 115         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 116         struct inode *inode;
 117         nid_t ino = 0;
 118         int err;
 119
 120         f2fs_balance_fs(sbi);
 121
 122         inode = f2fs_new_inode(dir, mode);
 123         if (IS_ERR(inode))
 124                 return PTR_ERR(inode);
 125
 126         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 127                 set_cold_files(sbi, inode, dentry->d_name.name);
 128
 129         inode->i_op = &f2fs_file_inode_operations;
 130         inode->i_fop = &f2fs_file_operations;
 131         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 132         ino = inode->i_ino;
 133
 134         f2fs_lock_op(sbi);
 135         err = f2fs_add_link(dentry, inode);
 136         f2fs_unlock_op(sbi);
 137         if (err)
 138                 goto out;
 139
 140         alloc_nid_done(sbi, ino);
 141
 142         d_instantiate(dentry, inode);
 143         unlock_new_inode(inode);
 144         return 0;
 145 out:
 146         clear_nlink(inode);
 147         unlock_new_inode(inode);
 148         make_bad_inode(inode);
 149         iput(inode);
 150         alloc_nid_failed(sbi, ino);
 151         return err;
 152 }
 153
 154 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 155                 struct dentry *dentry)
 156 {
 157         struct inode *inode = old_dentry->d_inode;
 158         struct super_block *sb = dir->i_sb;
 159         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 160         int err;
 161
 162         f2fs_balance_fs(sbi);
 163
 164         inode->i_ctime = CURRENT_TIME;
 165         ihold(inode);
 166
 167         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 168         f2fs_lock_op(sbi);
 169         err = f2fs_add_link(dentry, inode);
 170         f2fs_unlock_op(sbi);
 171         if (err)
 172                 goto out;
 173
 174         d_instantiate(dentry, inode);
 175         return 0;
 176 out:
 177         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 178         iput(inode);
 179         return err;
 180 }
 181
 182 struct dentry *f2fs_get_parent(struct dentry *child)
 183 {
 184         struct qstr dotdot = QSTR_INIT("..", 2);
 185         unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
 186         if (!ino)
 187                 return ERR_PTR(-ENOENT);
 188         return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
 189 }
 190
 191 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 192                 unsigned int flags)
 193 {
 194         struct inode *inode = NULL;
 195         struct f2fs_dir_entry *de;
 196         struct page *page;
 197
 198         if (dentry->d_name.len > F2FS_NAME_LEN)
 199                 return ERR_PTR(-ENAMETOOLONG);
 200
 201         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 202         if (de) {
 203                 nid_t ino = le32_to_cpu(de->ino);
 204                 kunmap(page);
 205                 f2fs_put_page(page, 0);
 206
 207                 inode = f2fs_iget(dir->i_sb, ino);
 208                 if (IS_ERR(inode))
 209                         return ERR_CAST(inode);
 210         }
 211
 212         return d_splice_alias(inode, dentry);
 213 }
 214
 215 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 216 {
 217         struct super_block *sb = dir->i_sb;
 218         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 219         struct inode *inode = dentry->d_inode;
 220         struct f2fs_dir_entry *de;
 221         struct page *page;
 222         int err = -ENOENT;
 223
 224         trace_f2fs_unlink_enter(dir, dentry);
 225         f2fs_balance_fs(sbi);
 226
 227         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 228         if (!de)
 229                 goto fail;
 230
 231         f2fs_lock_op(sbi);
 232         err = acquire_orphan_inode(sbi);
 233         if (err) {
 234                 f2fs_unlock_op(sbi);
 235                 kunmap(page);
 236                 f2fs_put_page(page, 0);
 237                 goto fail;
 238         }
 239         f2fs_delete_entry(de, page, inode);
 240         f2fs_unlock_op(sbi);
 241
 242         /* In order to evict this inode,  we set it dirty */
 243         mark_inode_dirty(inode);
 244 fail:
 245         trace_f2fs_unlink_exit(inode, err);
 246         return err;
 247 }
 248
 249 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 250                                         const char *symname)
 251 {
 252         struct super_block *sb = dir->i_sb;
 253         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 254         struct inode *inode;
 255         size_t symlen = strlen(symname) + 1;
 256         int err;
 257
 258         f2fs_balance_fs(sbi);
 259
 260         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 261         if (IS_ERR(inode))
 262                 return PTR_ERR(inode);
 263
 264         inode->i_op = &f2fs_symlink_inode_operations;
 265         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 266
 267         f2fs_lock_op(sbi);
 268         err = f2fs_add_link(dentry, inode);
 269         f2fs_unlock_op(sbi);
 270         if (err)
 271                 goto out;
 272
 273         err = page_symlink(inode, symname, symlen);
 274         alloc_nid_done(sbi, inode->i_ino);
 275
 276         d_instantiate(dentry, inode);
 277         unlock_new_inode(inode);
 278         return err;
 279 out:
 280         clear_nlink(inode);
 281         unlock_new_inode(inode);
 282         make_bad_inode(inode);
 283         iput(inode);
 284         alloc_nid_failed(sbi, inode->i_ino);
 285         return err;
 286 }
 287
 288 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 289 {
 290         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 291         struct inode *inode;
 292         int err;
 293
 294         f2fs_balance_fs(sbi);
 295
 296         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 297         if (IS_ERR(inode))
 298                 return PTR_ERR(inode);
 299
 300         inode->i_op = &f2fs_dir_inode_operations;
 301         inode->i_fop = &f2fs_dir_operations;
 302         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 303         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 304
 305         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 306         f2fs_lock_op(sbi);
 307         err = f2fs_add_link(dentry, inode);
 308         f2fs_unlock_op(sbi);
 309         if (err)
 310                 goto out_fail;
 311
 312         alloc_nid_done(sbi, inode->i_ino);
 313
 314         d_instantiate(dentry, inode);
 315         unlock_new_inode(inode);
 316
 317         return 0;
 318
 319 out_fail:
 320         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 321         clear_nlink(inode);
 322         unlock_new_inode(inode);
 323         make_bad_inode(inode);
 324         iput(inode);
 325         alloc_nid_failed(sbi, inode->i_ino);
 326         return err;
 327 }
 328
 329 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 330 {
 331         struct inode *inode = dentry->d_inode;
 332         if (f2fs_empty_dir(inode))
 333                 return f2fs_unlink(dir, dentry);
 334         return -ENOTEMPTY;
 335 }
 336
 337 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 338                                 umode_t mode, dev_t rdev)
 339 {
 340         struct super_block *sb = dir->i_sb;
 341         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 342         struct inode *inode;
 343         int err = 0;
 344
 345         if (!new_valid_dev(rdev))
 346                 return -EINVAL;
 347
 348         f2fs_balance_fs(sbi);
 349
 350         inode = f2fs_new_inode(dir, mode);
 351         if (IS_ERR(inode))
 352                 return PTR_ERR(inode);
 353
 354         init_special_inode(inode, inode->i_mode, rdev);
 355         inode->i_op = &f2fs_special_inode_operations;
 356
 357         f2fs_lock_op(sbi);
 358         err = f2fs_add_link(dentry, inode);
 359         f2fs_unlock_op(sbi);
 360         if (err)
 361                 goto out;
 362
 363         alloc_nid_done(sbi, inode->i_ino);
 364         d_instantiate(dentry, inode);
 365         unlock_new_inode(inode);
 366         return 0;
 367 out:
 368         clear_nlink(inode);
 369         unlock_new_inode(inode);
 370         make_bad_inode(inode);
 371         iput(inode);
 372         alloc_nid_failed(sbi, inode->i_ino);
 373         return err;
 374 }
 375
 376 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 377                         struct inode *new_dir, struct dentry *new_dentry)
 378 {
 379         struct super_block *sb = old_dir->i_sb;
 380         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 381         struct inode *old_inode = old_dentry->d_inode;
 382         struct inode *new_inode = new_dentry->d_inode;
 383         struct page *old_dir_page;
 384         struct page *old_page, *new_page;
 385         struct f2fs_dir_entry *old_dir_entry = NULL;
 386         struct f2fs_dir_entry *old_entry;
 387         struct f2fs_dir_entry *new_entry;
 388         int err = -ENOENT;
 389
 390         f2fs_balance_fs(sbi);
 391
 392         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 393         if (!old_entry)
 394                 goto out;
 395
 396         if (S_ISDIR(old_inode->i_mode)) {
 397                 err = -EIO;
 398                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 399                 if (!old_dir_entry)
 400                         goto out_old;
 401         }
 402
 403         f2fs_lock_op(sbi);
 404
 405         if (new_inode) {
 406
 407                 err = -ENOTEMPTY;
 408                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 409                         goto out_dir;
 410
 411                 err = -ENOENT;
 412                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 413                                                 &new_page);
 414                 if (!new_entry)
 415                         goto out_dir;
 416
 417                 err = acquire_orphan_inode(sbi);
 418                 if (err)
 419                         goto put_out_dir;
 420
 421                 if (update_dent_inode(old_inode, &new_dentry->d_name)) {
 422                         release_orphan_inode(sbi);
 423                         goto put_out_dir;
 424                 }
 425
 426                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 427
 428                 new_inode->i_ctime = CURRENT_TIME;
 429                 if (old_dir_entry)
 430                         drop_nlink(new_inode);
 431                 drop_nlink(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                 } else {
 461                         kunmap(old_dir_page);
 462                         f2fs_put_page(old_dir_page, 0);
 463                 }
 464                 drop_nlink(old_dir);
 465                 update_inode_page(old_dir);
 466         }
 467
 468         f2fs_unlock_op(sbi);
 469         return 0;
 470
 471 put_out_dir:
 472         f2fs_put_page(new_page, 1);
 473 out_dir:
 474         if (old_dir_entry) {
 475                 kunmap(old_dir_page);
 476                 f2fs_put_page(old_dir_page, 0);
 477         }
 478         f2fs_unlock_op(sbi);
 479 out_old:
 480         kunmap(old_page);
 481         f2fs_put_page(old_page, 0);
 482 out:
 483         return err;
 484 }
 485
 486 const struct inode_operations f2fs_dir_inode_operations = {
 487         .create         = f2fs_create,
 488         .lookup         = f2fs_lookup,
 489         .link           = f2fs_link,
 490         .unlink         = f2fs_unlink,
 491         .symlink        = f2fs_symlink,
 492         .mkdir          = f2fs_mkdir,
 493         .rmdir          = f2fs_rmdir,
 494         .mknod          = f2fs_mknod,
 495         .rename         = f2fs_rename,
 496         .getattr        = f2fs_getattr,
 497         .setattr        = f2fs_setattr,
 498         .get_acl        = f2fs_get_acl,
 499 #ifdef CONFIG_F2FS_FS_XATTR
 500         .setxattr       = generic_setxattr,
 501         .getxattr       = generic_getxattr,
 502         .listxattr      = f2fs_listxattr,
 503         .removexattr    = generic_removexattr,
 504 #endif
 505 };
 506
 507 const struct inode_operations f2fs_symlink_inode_operations = {
 508         .readlink       = generic_readlink,
 509         .follow_link    = page_follow_link_light,
 510         .put_link       = page_put_link,
 511         .getattr        = f2fs_getattr,
 512         .setattr        = f2fs_setattr,
 513 #ifdef CONFIG_F2FS_FS_XATTR
 514         .setxattr       = generic_setxattr,
 515         .getxattr       = generic_getxattr,
 516         .listxattr      = f2fs_listxattr,
 517         .removexattr    = generic_removexattr,
 518 #endif
 519 };
 520
 521 const struct inode_operations f2fs_special_inode_operations = {
 522         .getattr        = f2fs_getattr,
 523         .setattr        = f2fs_setattr,
 524         .get_acl        = f2fs_get_acl,
 525 #ifdef CONFIG_F2FS_FS_XATTR
 526         .setxattr       = generic_setxattr,
 527         .getxattr       = generic_getxattr,
 528         .listxattr      = f2fs_listxattr,
 529         .removexattr    = generic_removexattr,
 530 #endif
 531 };