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 "xattr.h"
  19 #include "acl.h"
  20
  21 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  22 {
  23         struct super_block *sb = dir->i_sb;
  24         struct f2fs_sb_info *sbi = F2FS_SB(sb);
  25         nid_t ino;
  26         struct inode *inode;
  27         bool nid_free = false;
  28         int err;
  29
  30         inode = new_inode(sb);
  31         if (!inode)
  32                 return ERR_PTR(-ENOMEM);
  33
  34         mutex_lock_op(sbi, NODE_NEW);
  35         if (!alloc_nid(sbi, &ino)) {
  36                 mutex_unlock_op(sbi, NODE_NEW);
  37                 err = -ENOSPC;
  38                 goto fail;
  39         }
  40         mutex_unlock_op(sbi, NODE_NEW);
  41
  42         inode->i_uid = current_fsuid();
  43
  44         if (dir->i_mode & S_ISGID) {
  45                 inode->i_gid = dir->i_gid;
  46                 if (S_ISDIR(mode))
  47                         mode |= S_ISGID;
  48         } else {
  49                 inode->i_gid = current_fsgid();
  50         }
  51
  52         inode->i_ino = ino;
  53         inode->i_mode = mode;
  54         inode->i_blocks = 0;
  55         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
  56         inode->i_generation = sbi->s_next_generation++;
  57
  58         err = insert_inode_locked(inode);
  59         if (err) {
  60                 err = -EINVAL;
  61                 nid_free = true;
  62                 goto out;
  63         }
  64
  65         mark_inode_dirty(inode);
  66         return inode;
  67
  68 out:
  69         clear_nlink(inode);
  70         unlock_new_inode(inode);
  71 fail:
  72         iput(inode);
  73         if (nid_free)
  74                 alloc_nid_failed(sbi, ino);
  75         return ERR_PTR(err);
  76 }
  77
  78 static int is_multimedia_file(const unsigned char *s, const char *sub)
  79 {
  80         size_t slen = strlen(s);
  81         size_t sublen = strlen(sub);
  82         int ret;
  83
  84         if (sublen > slen)
  85                 return 1;
  86
  87         ret = memcmp(s + slen - sublen, sub, sublen);
  88         if (ret) {      /* compare upper case */
  89                 int i;
  90                 char upper_sub[8];
  91                 for (i = 0; i < sublen && i < sizeof(upper_sub); i++)
  92                         upper_sub[i] = toupper(sub[i]);
  93                 return memcmp(s + slen - sublen, upper_sub, sublen);
  94         }
  95
  96         return ret;
  97 }
  98
  99 /*
 100  * Set multimedia files as cold files for hot/cold data separation
 101  */
 102 static inline void set_cold_file(struct f2fs_sb_info *sbi, struct inode *inode,
 103                 const unsigned char *name)
 104 {
 105         int i;
 106         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 107
 108         int count = le32_to_cpu(sbi->raw_super->extension_count);
 109         for (i = 0; i < count; i++) {
 110                 if (!is_multimedia_file(name, extlist[i])) {
 111                         F2FS_I(inode)->i_advise |= FADVISE_COLD_BIT;
 112                         break;
 113                 }
 114         }
 115 }
 116
 117 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 118                                                 bool excl)
 119 {
 120         struct super_block *sb = dir->i_sb;
 121         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 122         struct inode *inode;
 123         nid_t ino = 0;
 124         int err;
 125
 126         f2fs_balance_fs(sbi);
 127
 128         inode = f2fs_new_inode(dir, mode);
 129         if (IS_ERR(inode))
 130                 return PTR_ERR(inode);
 131
 132         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 133                 set_cold_file(sbi, inode, dentry->d_name.name);
 134
 135         inode->i_op = &f2fs_file_inode_operations;
 136         inode->i_fop = &f2fs_file_operations;
 137         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 138         ino = inode->i_ino;
 139
 140         err = f2fs_add_link(dentry, inode);
 141         if (err)
 142                 goto out;
 143
 144         alloc_nid_done(sbi, ino);
 145
 146         if (!sbi->por_doing)
 147                 d_instantiate(dentry, inode);
 148         unlock_new_inode(inode);
 149         return 0;
 150 out:
 151         clear_nlink(inode);
 152         unlock_new_inode(inode);
 153         iput(inode);
 154         alloc_nid_failed(sbi, ino);
 155         return err;
 156 }
 157
 158 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 159                 struct dentry *dentry)
 160 {
 161         struct inode *inode = old_dentry->d_inode;
 162         struct super_block *sb = dir->i_sb;
 163         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 164         int err;
 165
 166         f2fs_balance_fs(sbi);
 167
 168         inode->i_ctime = CURRENT_TIME;
 169         atomic_inc(&inode->i_count);
 170
 171         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 172         err = f2fs_add_link(dentry, inode);
 173         if (err)
 174                 goto out;
 175
 176         d_instantiate(dentry, inode);
 177         return 0;
 178 out:
 179         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 180         iput(inode);
 181         return err;
 182 }
 183
 184 struct dentry *f2fs_get_parent(struct dentry *child)
 185 {
 186         struct qstr dotdot = QSTR_INIT("..", 2);
 187         unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
 188         if (!ino)
 189                 return ERR_PTR(-ENOENT);
 190         return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
 191 }
 192
 193 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 194                 unsigned int flags)
 195 {
 196         struct inode *inode = NULL;
 197         struct f2fs_dir_entry *de;
 198         struct page *page;
 199
 200         if (dentry->d_name.len > F2FS_MAX_NAME_LEN)
 201                 return ERR_PTR(-ENAMETOOLONG);
 202
 203         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 204         if (de) {
 205                 nid_t ino = le32_to_cpu(de->ino);
 206                 kunmap(page);
 207                 f2fs_put_page(page, 0);
 208
 209                 inode = f2fs_iget(dir->i_sb, ino);
 210                 if (IS_ERR(inode))
 211                         return ERR_CAST(inode);
 212         }
 213
 214         return d_splice_alias(inode, dentry);
 215 }
 216
 217 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 218 {
 219         struct super_block *sb = dir->i_sb;
 220         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 221         struct inode *inode = dentry->d_inode;
 222         struct f2fs_dir_entry *de;
 223         struct page *page;
 224         int err = -ENOENT;
 225
 226         f2fs_balance_fs(sbi);
 227
 228         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 229         if (!de)
 230                 goto fail;
 231
 232         err = check_orphan_space(sbi);
 233         if (err) {
 234                 kunmap(page);
 235                 f2fs_put_page(page, 0);
 236                 goto fail;
 237         }
 238
 239         f2fs_delete_entry(de, page, inode);
 240
 241         /* In order to evict this inode,  we set it dirty */
 242         mark_inode_dirty(inode);
 243 fail:
 244         return err;
 245 }
 246
 247 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 248                                         const char *symname)
 249 {
 250         struct super_block *sb = dir->i_sb;
 251         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 252         struct inode *inode;
 253         size_t symlen = strlen(symname) + 1;
 254         int err;
 255
 256         f2fs_balance_fs(sbi);
 257
 258         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 259         if (IS_ERR(inode))
 260                 return PTR_ERR(inode);
 261
 262         inode->i_op = &f2fs_symlink_inode_operations;
 263         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 264
 265         err = f2fs_add_link(dentry, inode);
 266         if (err)
 267                 goto out;
 268
 269         err = page_symlink(inode, symname, symlen);
 270         alloc_nid_done(sbi, inode->i_ino);
 271
 272         d_instantiate(dentry, inode);
 273         unlock_new_inode(inode);
 274         return err;
 275 out:
 276         clear_nlink(inode);
 277         unlock_new_inode(inode);
 278         iput(inode);
 279         alloc_nid_failed(sbi, inode->i_ino);
 280         return err;
 281 }
 282
 283 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 284 {
 285         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 286         struct inode *inode;
 287         int err;
 288
 289         f2fs_balance_fs(sbi);
 290
 291         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 292         if (IS_ERR(inode))
 293                 return PTR_ERR(inode);
 294
 295         inode->i_op = &f2fs_dir_inode_operations;
 296         inode->i_fop = &f2fs_dir_operations;
 297         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 298         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 299
 300         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 301         err = f2fs_add_link(dentry, inode);
 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         iput(inode);
 317         alloc_nid_failed(sbi, inode->i_ino);
 318         return err;
 319 }
 320
 321 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 322 {
 323         struct inode *inode = dentry->d_inode;
 324         if (f2fs_empty_dir(inode))
 325                 return f2fs_unlink(dir, dentry);
 326         return -ENOTEMPTY;
 327 }
 328
 329 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 330                                 umode_t mode, dev_t rdev)
 331 {
 332         struct super_block *sb = dir->i_sb;
 333         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 334         struct inode *inode;
 335         int err = 0;
 336
 337         if (!new_valid_dev(rdev))
 338                 return -EINVAL;
 339
 340         f2fs_balance_fs(sbi);
 341
 342         inode = f2fs_new_inode(dir, mode);
 343         if (IS_ERR(inode))
 344                 return PTR_ERR(inode);
 345
 346         init_special_inode(inode, inode->i_mode, rdev);
 347         inode->i_op = &f2fs_special_inode_operations;
 348
 349         err = f2fs_add_link(dentry, inode);
 350         if (err)
 351                 goto out;
 352
 353         alloc_nid_done(sbi, inode->i_ino);
 354         d_instantiate(dentry, inode);
 355         unlock_new_inode(inode);
 356         return 0;
 357 out:
 358         clear_nlink(inode);
 359         unlock_new_inode(inode);
 360         iput(inode);
 361         alloc_nid_failed(sbi, inode->i_ino);
 362         return err;
 363 }
 364
 365 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 366                         struct inode *new_dir, struct dentry *new_dentry)
 367 {
 368         struct super_block *sb = old_dir->i_sb;
 369         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 370         struct inode *old_inode = old_dentry->d_inode;
 371         struct inode *new_inode = new_dentry->d_inode;
 372         struct page *old_dir_page;
 373         struct page *old_page;
 374         struct f2fs_dir_entry *old_dir_entry = NULL;
 375         struct f2fs_dir_entry *old_entry;
 376         struct f2fs_dir_entry *new_entry;
 377         int err = -ENOENT;
 378
 379         f2fs_balance_fs(sbi);
 380
 381         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 382         if (!old_entry)
 383                 goto out;
 384
 385         if (S_ISDIR(old_inode->i_mode)) {
 386                 err = -EIO;
 387                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 388                 if (!old_dir_entry)
 389                         goto out_old;
 390         }
 391
 392         mutex_lock_op(sbi, RENAME);
 393
 394         if (new_inode) {
 395                 struct page *new_page;
 396
 397                 err = -ENOTEMPTY;
 398                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 399                         goto out_dir;
 400
 401                 err = -ENOENT;
 402                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 403                                                 &new_page);
 404                 if (!new_entry)
 405                         goto out_dir;
 406
 407                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 408
 409                 new_inode->i_ctime = CURRENT_TIME;
 410                 if (old_dir_entry)
 411                         drop_nlink(new_inode);
 412                 drop_nlink(new_inode);
 413                 if (!new_inode->i_nlink)
 414                         add_orphan_inode(sbi, new_inode->i_ino);
 415                 f2fs_write_inode(new_inode, NULL);
 416         } else {
 417                 err = f2fs_add_link(new_dentry, old_inode);
 418                 if (err)
 419                         goto out_dir;
 420
 421                 if (old_dir_entry) {
 422                         inc_nlink(new_dir);
 423                         f2fs_write_inode(new_dir, NULL);
 424                 }
 425         }
 426
 427         old_inode->i_ctime = CURRENT_TIME;
 428         set_inode_flag(F2FS_I(old_inode), FI_NEED_CP);
 429         mark_inode_dirty(old_inode);
 430
 431         f2fs_delete_entry(old_entry, old_page, NULL);
 432
 433         if (old_dir_entry) {
 434                 if (old_dir != new_dir) {
 435                         f2fs_set_link(old_inode, old_dir_entry,
 436                                                 old_dir_page, new_dir);
 437                 } else {
 438                         kunmap(old_dir_page);
 439                         f2fs_put_page(old_dir_page, 0);
 440                 }
 441                 drop_nlink(old_dir);
 442                 f2fs_write_inode(old_dir, NULL);
 443         }
 444
 445         mutex_unlock_op(sbi, RENAME);
 446         return 0;
 447
 448 out_dir:
 449         if (old_dir_entry) {
 450                 kunmap(old_dir_page);
 451                 f2fs_put_page(old_dir_page, 0);
 452         }
 453         mutex_unlock_op(sbi, RENAME);
 454 out_old:
 455         kunmap(old_page);
 456         f2fs_put_page(old_page, 0);
 457 out:
 458         return err;
 459 }
 460
 461 const struct inode_operations f2fs_dir_inode_operations = {
 462         .create         = f2fs_create,
 463         .lookup         = f2fs_lookup,
 464         .link           = f2fs_link,
 465         .unlink         = f2fs_unlink,
 466         .symlink        = f2fs_symlink,
 467         .mkdir          = f2fs_mkdir,
 468         .rmdir          = f2fs_rmdir,
 469         .mknod          = f2fs_mknod,
 470         .rename         = f2fs_rename,
 471         .setattr        = f2fs_setattr,
 472         .get_acl        = f2fs_get_acl,
 473 #ifdef CONFIG_F2FS_FS_XATTR
 474         .setxattr       = generic_setxattr,
 475         .getxattr       = generic_getxattr,
 476         .listxattr      = f2fs_listxattr,
 477         .removexattr    = generic_removexattr,
 478 #endif
 479 };
 480
 481 const struct inode_operations f2fs_symlink_inode_operations = {
 482         .readlink       = generic_readlink,
 483         .follow_link    = page_follow_link_light,
 484         .put_link       = page_put_link,
 485         .setattr        = f2fs_setattr,
 486 #ifdef CONFIG_F2FS_FS_XATTR
 487         .setxattr       = generic_setxattr,
 488         .getxattr       = generic_getxattr,
 489         .listxattr      = f2fs_listxattr,
 490         .removexattr    = generic_removexattr,
 491 #endif
 492 };
 493
 494 const struct inode_operations f2fs_special_inode_operations = {
 495         .setattr        = f2fs_setattr,
 496         .get_acl        = f2fs_get_acl,
 497 #ifdef CONFIG_F2FS_FS_XATTR
 498         .setxattr       = generic_setxattr,
 499         .getxattr       = generic_getxattr,
 500         .listxattr      = f2fs_listxattr,
 501         .removexattr    = generic_removexattr,
 502 #endif
 503 };