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
  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, ilock;
 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         ilock = mutex_lock_op(sbi);
 135         err = f2fs_add_link(dentry, inode);
 136         mutex_unlock_op(sbi, ilock);
 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, ilock;
 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         ilock = mutex_lock_op(sbi);
 169         err = f2fs_add_link(dentry, inode);
 170         mutex_unlock_op(sbi, ilock);
 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         int ilock;
 224
 225         trace_f2fs_unlink_enter(dir, dentry);
 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 = acquire_orphan_inode(sbi);
 233         if (err) {
 234                 kunmap(page);
 235                 f2fs_put_page(page, 0);
 236                 goto fail;
 237         }
 238
 239         ilock = mutex_lock_op(sbi);
 240         f2fs_delete_entry(de, page, inode);
 241         mutex_unlock_op(sbi, ilock);
 242
 243         /* In order to evict this inode,  we set it dirty */
 244         mark_inode_dirty(inode);
 245 fail:
 246         trace_f2fs_unlink_exit(inode, err);
 247         return err;
 248 }
 249
 250 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 251                                         const char *symname)
 252 {
 253         struct super_block *sb = dir->i_sb;
 254         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 255         struct inode *inode;
 256         size_t symlen = strlen(symname) + 1;
 257         int err, ilock;
 258
 259         f2fs_balance_fs(sbi);
 260
 261         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 262         if (IS_ERR(inode))
 263                 return PTR_ERR(inode);
 264
 265         inode->i_op = &f2fs_symlink_inode_operations;
 266         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 267
 268         ilock = mutex_lock_op(sbi);
 269         err = f2fs_add_link(dentry, inode);
 270         mutex_unlock_op(sbi, ilock);
 271         if (err)
 272                 goto out;
 273
 274         err = page_symlink(inode, symname, symlen);
 275         alloc_nid_done(sbi, inode->i_ino);
 276
 277         d_instantiate(dentry, inode);
 278         unlock_new_inode(inode);
 279         return err;
 280 out:
 281         clear_nlink(inode);
 282         unlock_new_inode(inode);
 283         make_bad_inode(inode);
 284         iput(inode);
 285         alloc_nid_failed(sbi, inode->i_ino);
 286         return err;
 287 }
 288
 289 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 290 {
 291         struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
 292         struct inode *inode;
 293         int err, ilock;
 294
 295         f2fs_balance_fs(sbi);
 296
 297         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 298         if (IS_ERR(inode))
 299                 return PTR_ERR(inode);
 300
 301         inode->i_op = &f2fs_dir_inode_operations;
 302         inode->i_fop = &f2fs_dir_operations;
 303         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 304         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
 305
 306         set_inode_flag(F2FS_I(inode), FI_INC_LINK);
 307         ilock = mutex_lock_op(sbi);
 308         err = f2fs_add_link(dentry, inode);
 309         mutex_unlock_op(sbi, ilock);
 310         if (err)
 311                 goto out_fail;
 312
 313         alloc_nid_done(sbi, inode->i_ino);
 314
 315         d_instantiate(dentry, inode);
 316         unlock_new_inode(inode);
 317
 318         return 0;
 319
 320 out_fail:
 321         clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
 322         clear_nlink(inode);
 323         unlock_new_inode(inode);
 324         make_bad_inode(inode);
 325         iput(inode);
 326         alloc_nid_failed(sbi, inode->i_ino);
 327         return err;
 328 }
 329
 330 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 331 {
 332         struct inode *inode = dentry->d_inode;
 333         if (f2fs_empty_dir(inode))
 334                 return f2fs_unlink(dir, dentry);
 335         return -ENOTEMPTY;
 336 }
 337
 338 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 339                                 umode_t mode, dev_t rdev)
 340 {
 341         struct super_block *sb = dir->i_sb;
 342         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 343         struct inode *inode;
 344         int err = 0;
 345         int ilock;
 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         ilock = mutex_lock_op(sbi);
 360         err = f2fs_add_link(dentry, inode);
 361         mutex_unlock_op(sbi, ilock);
 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, ilock = -1;
 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         ilock = mutex_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
 430                 new_inode->i_ctime = CURRENT_TIME;
 431                 if (old_dir_entry)
 432                         drop_nlink(new_inode);
 433                 drop_nlink(new_inode);
 434
 435                 if (!new_inode->i_nlink)
 436                         add_orphan_inode(sbi, new_inode->i_ino);
 437                 else
 438                         release_orphan_inode(sbi);
 439
 440                 update_inode_page(old_inode);
 441                 update_inode_page(new_inode);
 442         } else {
 443                 err = f2fs_add_link(new_dentry, old_inode);
 444                 if (err)
 445                         goto out_dir;
 446
 447                 if (old_dir_entry) {
 448                         inc_nlink(new_dir);
 449                         update_inode_page(new_dir);
 450                 }
 451         }
 452
 453         old_inode->i_ctime = CURRENT_TIME;
 454         mark_inode_dirty(old_inode);
 455
 456         f2fs_delete_entry(old_entry, old_page, NULL);
 457
 458         if (old_dir_entry) {
 459                 if (old_dir != new_dir) {
 460                         f2fs_set_link(old_inode, old_dir_entry,
 461                                                 old_dir_page, new_dir);
 462                 } else {
 463                         kunmap(old_dir_page);
 464                         f2fs_put_page(old_dir_page, 0);
 465                 }
 466                 drop_nlink(old_dir);
 467                 update_inode_page(old_dir);
 468         }
 469
 470         mutex_unlock_op(sbi, ilock);
 471         return 0;
 472
 473 put_out_dir:
 474         f2fs_put_page(new_page, 1);
 475 out_dir:
 476         if (old_dir_entry) {
 477                 kunmap(old_dir_page);
 478                 f2fs_put_page(old_dir_page, 0);
 479         }
 480         mutex_unlock_op(sbi, ilock);
 481 out_old:
 482         kunmap(old_page);
 483         f2fs_put_page(old_page, 0);
 484 out:
 485         return err;
 486 }
 487
 488 const struct inode_operations f2fs_dir_inode_operations = {
 489         .create         = f2fs_create,
 490         .lookup         = f2fs_lookup,
 491         .link           = f2fs_link,
 492         .unlink         = f2fs_unlink,
 493         .symlink        = f2fs_symlink,
 494         .mkdir          = f2fs_mkdir,
 495         .rmdir          = f2fs_rmdir,
 496         .mknod          = f2fs_mknod,
 497         .rename         = f2fs_rename,
 498         .getattr        = f2fs_getattr,
 499         .setattr        = f2fs_setattr,
 500         .get_acl        = f2fs_get_acl,
 501 #ifdef CONFIG_F2FS_FS_XATTR
 502         .setxattr       = generic_setxattr,
 503         .getxattr       = generic_getxattr,
 504         .listxattr      = f2fs_listxattr,
 505         .removexattr    = generic_removexattr,
 506 #endif
 507 };
 508
 509 const struct inode_operations f2fs_symlink_inode_operations = {
 510         .readlink       = generic_readlink,
 511         .follow_link    = page_follow_link_light,
 512         .put_link       = page_put_link,
 513         .getattr        = f2fs_getattr,
 514         .setattr        = f2fs_setattr,
 515 #ifdef CONFIG_F2FS_FS_XATTR
 516         .setxattr       = generic_setxattr,
 517         .getxattr       = generic_getxattr,
 518         .listxattr      = f2fs_listxattr,
 519         .removexattr    = generic_removexattr,
 520 #endif
 521 };
 522
 523 const struct inode_operations f2fs_special_inode_operations = {
 524         .getattr        = f2fs_getattr,
 525         .setattr        = f2fs_setattr,
 526         .get_acl        = f2fs_get_acl,
 527 #ifdef CONFIG_F2FS_FS_XATTR
 528         .setxattr       = generic_setxattr,
 529         .getxattr       = generic_getxattr,
 530         .listxattr      = f2fs_listxattr,
 531         .removexattr    = generic_removexattr,
 532 #endif
 533 };