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, 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 };