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                 stat_inc_inline_inode(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         trace_f2fs_unlink_enter(dir, dentry);
 227         f2fs_balance_fs(sbi);
 228
 229         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 230         if (!de)
 231                 goto fail;
 232
 233         f2fs_lock_op(sbi);
 234         err = acquire_orphan_inode(sbi);
 235         if (err) {
 236                 f2fs_unlock_op(sbi);
 237                 kunmap(page);
 238                 f2fs_put_page(page, 0);
 239                 goto fail;
 240         }
 241         f2fs_delete_entry(de, page, inode);
 242         f2fs_unlock_op(sbi);
 243
 244         /* In order to evict this inode,  we set it dirty */
 245         mark_inode_dirty(inode);
 246 fail:
 247         trace_f2fs_unlink_exit(inode, err);
 248         return err;
 249 }
 250
 251 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 252                                         const char *symname)
 253 {
 254         struct super_block *sb = dir->i_sb;
 255         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 256         struct inode *inode;
 257         size_t symlen = strlen(symname) + 1;
 258         int err;
 259
 260         f2fs_balance_fs(sbi);
 261
 262         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 263         if (IS_ERR(inode))
 264                 return PTR_ERR(inode);
 265
 266         inode->i_op = &f2fs_symlink_inode_operations;
 267         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 268
 269         f2fs_lock_op(sbi);
 270         err = f2fs_add_link(dentry, inode);
 271         f2fs_unlock_op(sbi);
 272         if (err)
 273                 goto out;
 274
 275         err = page_symlink(inode, symname, symlen);
 276         alloc_nid_done(sbi, inode->i_ino);
 277
 278         d_instantiate(dentry, inode);
 279         unlock_new_inode(inode);
 280         return err;
 281 out:
 282         clear_nlink(inode);
 283         unlock_new_inode(inode);
 284         make_bad_inode(inode);
 285         iput(inode);
 286         alloc_nid_failed(sbi, inode->i_ino);
 287         return err;
 288 }
 289
 290 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 291 {
 292         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 293         struct inode *inode;
 294         int err;
 295
 296         f2fs_balance_fs(sbi);
 297
 298         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 299         if (IS_ERR(inode))
 300                 return PTR_ERR(inode);
 301
 302         inode->i_op = &f2fs_dir_inode_operations;
 303         inode->i_fop = &f2fs_dir_operations;
 304         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 305         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 306
 307         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 308         f2fs_lock_op(sbi);
 309         err = f2fs_add_link(dentry, inode);
 310         f2fs_unlock_op(sbi);
 311         if (err)
 312                 goto out_fail;
 313
 314         alloc_nid_done(sbi, inode->i_ino);
 315
 316         d_instantiate(dentry, inode);
 317         unlock_new_inode(inode);
 318
 319         return 0;
 320
 321 out_fail:
 322         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 323         clear_nlink(inode);
 324         unlock_new_inode(inode);
 325         make_bad_inode(inode);
 326         iput(inode);
 327         alloc_nid_failed(sbi, inode->i_ino);
 328         return err;
 329 }
 330
 331 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 332 {
 333         struct inode *inode = dentry->d_inode;
 334         if (f2fs_empty_dir(inode))
 335                 return f2fs_unlink(dir, dentry);
 336         return -ENOTEMPTY;
 337 }
 338
 339 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 340                                 umode_t mode, dev_t rdev)
 341 {
 342         struct super_block *sb = dir->i_sb;
 343         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 344         struct inode *inode;
 345         int err = 0;
 346
 347         if (!new_valid_dev(rdev))
 348                 return -EINVAL;
 349
 350         f2fs_balance_fs(sbi);
 351
 352         inode = f2fs_new_inode(dir, mode);
 353         if (IS_ERR(inode))
 354                 return PTR_ERR(inode);
 355
 356         init_special_inode(inode, inode->i_mode, rdev);
 357         inode->i_op = &f2fs_special_inode_operations;
 358
 359         f2fs_lock_op(sbi);
 360         err = f2fs_add_link(dentry, inode);
 361         f2fs_unlock_op(sbi);
 362         if (err)
 363                 goto out;
 364
 365         alloc_nid_done(sbi, inode->i_ino);
 366         d_instantiate(dentry, inode);
 367         unlock_new_inode(inode);
 368         return 0;
 369 out:
 370         clear_nlink(inode);
 371         unlock_new_inode(inode);
 372         make_bad_inode(inode);
 373         iput(inode);
 374         alloc_nid_failed(sbi, inode->i_ino);
 375         return err;
 376 }
 377
 378 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 379                         struct inode *new_dir, struct dentry *new_dentry)
 380 {
 381         struct super_block *sb = old_dir->i_sb;
 382         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 383         struct inode *old_inode = old_dentry->d_inode;
 384         struct inode *new_inode = new_dentry->d_inode;
 385         struct page *old_dir_page;
 386         struct page *old_page, *new_page;
 387         struct f2fs_dir_entry *old_dir_entry = NULL;
 388         struct f2fs_dir_entry *old_entry;
 389         struct f2fs_dir_entry *new_entry;
 390         int err = -ENOENT;
 391
 392         f2fs_balance_fs(sbi);
 393
 394         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 395         if (!old_entry)
 396                 goto out;
 397
 398         if (S_ISDIR(old_inode->i_mode)) {
 399                 err = -EIO;
 400                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 401                 if (!old_dir_entry)
 402                         goto out_old;
 403         }
 404
 405         f2fs_lock_op(sbi);
 406
 407         if (new_inode) {
 408
 409                 err = -ENOTEMPTY;
 410                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 411                         goto out_dir;
 412
 413                 err = -ENOENT;
 414                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 415                                                 &new_page);
 416                 if (!new_entry)
 417                         goto out_dir;
 418
 419                 err = acquire_orphan_inode(sbi);
 420                 if (err)
 421                         goto put_out_dir;
 422
 423                 if (update_dent_inode(old_inode, &new_dentry->d_name)) {
 424                         release_orphan_inode(sbi);
 425                         goto put_out_dir;
 426                 }
 427
 428                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 429                 down_write(&F2FS_I(old_inode)->i_sem);
 430                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 431                 up_write(&F2FS_I(old_inode)->i_sem);
 432
 433                 new_inode->i_ctime = CURRENT_TIME;
 434                 down_write(&F2FS_I(new_inode)->i_sem);
 435                 if (old_dir_entry)
 436                         drop_nlink(new_inode);
 437                 drop_nlink(new_inode);
 438                 up_write(&F2FS_I(new_inode)->i_sem);
 439
 440                 mark_inode_dirty(new_inode);
 441
 442                 if (!new_inode->i_nlink)
 443                         add_orphan_inode(sbi, new_inode->i_ino);
 444                 else
 445                         release_orphan_inode(sbi);
 446
 447                 update_inode_page(old_inode);
 448                 update_inode_page(new_inode);
 449         } else {
 450                 err = f2fs_add_link(new_dentry, old_inode);
 451                 if (err)
 452                         goto out_dir;
 453
 454                 if (old_dir_entry) {
 455                         inc_nlink(new_dir);
 456                         update_inode_page(new_dir);
 457                 }
 458         }
 459
 460         old_inode->i_ctime = CURRENT_TIME;
 461         mark_inode_dirty(old_inode);
 462
 463         f2fs_delete_entry(old_entry, old_page, NULL);
 464
 465         if (old_dir_entry) {
 466                 if (old_dir != new_dir) {
 467                         f2fs_set_link(old_inode, old_dir_entry,
 468                                                 old_dir_page, new_dir);
 469                         down_write(&F2FS_I(old_inode)->i_sem);
 470                         F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 471                         up_write(&F2FS_I(old_inode)->i_sem);
 472                         update_inode_page(old_inode);
 473                 } else {
 474                         kunmap(old_dir_page);
 475                         f2fs_put_page(old_dir_page, 0);
 476                 }
 477                 drop_nlink(old_dir);
 478                 mark_inode_dirty(old_dir);
 479                 update_inode_page(old_dir);
 480         }
 481
 482         f2fs_unlock_op(sbi);
 483         return 0;
 484
 485 put_out_dir:
 486         f2fs_put_page(new_page, 1);
 487 out_dir:
 488         if (old_dir_entry) {
 489                 kunmap(old_dir_page);
 490                 f2fs_put_page(old_dir_page, 0);
 491         }
 492         f2fs_unlock_op(sbi);
 493 out_old:
 494         kunmap(old_page);
 495         f2fs_put_page(old_page, 0);
 496 out:
 497         return err;
 498 }
 499
 500 const struct inode_operations f2fs_dir_inode_operations = {
 501         .create         = f2fs_create,
 502         .lookup         = f2fs_lookup,
 503         .link           = f2fs_link,
 504         .unlink         = f2fs_unlink,
 505         .symlink        = f2fs_symlink,
 506         .mkdir          = f2fs_mkdir,
 507         .rmdir          = f2fs_rmdir,
 508         .mknod          = f2fs_mknod,
 509         .rename         = f2fs_rename,
 510         .getattr        = f2fs_getattr,
 511         .setattr        = f2fs_setattr,
 512         .get_acl        = f2fs_get_acl,
 513         .set_acl        = f2fs_set_acl,
 514 #ifdef CONFIG_F2FS_FS_XATTR
 515         .setxattr       = generic_setxattr,
 516         .getxattr       = generic_getxattr,
 517         .listxattr      = f2fs_listxattr,
 518         .removexattr    = generic_removexattr,
 519 #endif
 520 };
 521
 522 const struct inode_operations f2fs_symlink_inode_operations = {
 523         .readlink       = generic_readlink,
 524         .follow_link    = page_follow_link_light,
 525         .put_link       = page_put_link,
 526         .getattr        = f2fs_getattr,
 527         .setattr        = f2fs_setattr,
 528 #ifdef CONFIG_F2FS_FS_XATTR
 529         .setxattr       = generic_setxattr,
 530         .getxattr       = generic_getxattr,
 531         .listxattr      = f2fs_listxattr,
 532         .removexattr    = generic_removexattr,
 533 #endif
 534 };
 535
 536 const struct inode_operations f2fs_special_inode_operations = {
 537         .getattr        = f2fs_getattr,
 538         .setattr        = f2fs_setattr,
 539         .get_acl        = f2fs_get_acl,
 540         .set_acl        = f2fs_set_acl,
 541 #ifdef CONFIG_F2FS_FS_XATTR
 542         .setxattr       = generic_setxattr,
 543         .getxattr       = generic_getxattr,
 544         .listxattr      = f2fs_listxattr,
 545         .removexattr    = generic_removexattr,
 546 #endif
 547 };