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 #include <linux/dcache.h>
  17 #include <linux/namei.h>
  18 #include <linux/quotaops.h>
  19
  20 #include "f2fs.h"
  21 #include "node.h"
  22 #include "xattr.h"
  23 #include "acl.h"
  24 #include <trace/events/f2fs.h>
  25
  26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  27 {
  28         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  29         nid_t ino;
  30         struct inode *inode;
  31         bool nid_free = false;
  32         int xattr_size = 0;
  33         int err;
  34
  35         inode = new_inode(dir->i_sb);
  36         if (!inode)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         f2fs_lock_op(sbi);
  40         if (!alloc_nid(sbi, &ino)) {
  41                 f2fs_unlock_op(sbi);
  42                 err = -ENOSPC;
  43                 goto fail;
  44         }
  45         f2fs_unlock_op(sbi);
  46
  47         nid_free = true;
  48
  49         inode_init_owner(inode, dir, mode);
  50
  51         inode->i_ino = ino;
  52         inode->i_blocks = 0;
  53         inode->i_mtime = inode->i_atime = inode->i_ctime =
  54                         F2FS_I(inode)->i_crtime = current_time(inode);
  55         inode->i_generation = sbi->s_next_generation++;
  56
  57         err = insert_inode_locked(inode);
  58         if (err) {
  59                 err = -EINVAL;
  60                 goto fail;
  61         }
  62
  63         if (f2fs_sb_has_project_quota(sbi->sb) &&
  64                 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
  65                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  66         else
  67                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  68                                                         F2FS_DEF_PROJID);
  69
  70         err = dquot_initialize(inode);
  71         if (err)
  72                 goto fail_drop;
  73
  74         err = dquot_alloc_inode(inode);
  75         if (err)
  76                 goto fail_drop;
  77
  78         set_inode_flag(inode, FI_NEW_INODE);
  79
  80         /* If the directory encrypted, then we should encrypt the inode. */
  81         if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
  82                 f2fs_set_encrypted_inode(inode);
  83
  84         if (f2fs_sb_has_extra_attr(sbi->sb)) {
  85                 set_inode_flag(inode, FI_EXTRA_ATTR);
  86                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  87         }
  88
  89         if (test_opt(sbi, INLINE_XATTR))
  90                 set_inode_flag(inode, FI_INLINE_XATTR);
  91
  92         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  93                 set_inode_flag(inode, FI_INLINE_DATA);
  94         if (f2fs_may_inline_dentry(inode))
  95                 set_inode_flag(inode, FI_INLINE_DENTRY);
  96
  97         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
  98                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
  99                 if (f2fs_has_inline_xattr(inode))
 100                         xattr_size = sbi->inline_xattr_size;
 101                 /* Otherwise, will be 0 */
 102         } else if (f2fs_has_inline_xattr(inode) ||
 103                                 f2fs_has_inline_dentry(inode)) {
 104                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 105         }
 106         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 107
 108         f2fs_init_extent_tree(inode, NULL);
 109
 110         stat_inc_inline_xattr(inode);
 111         stat_inc_inline_inode(inode);
 112         stat_inc_inline_dir(inode);
 113
 114         F2FS_I(inode)->i_flags =
 115                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 116
 117         if (S_ISDIR(inode->i_mode))
 118                 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
 119
 120         if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
 121                 set_inode_flag(inode, FI_PROJ_INHERIT);
 122
 123         trace_f2fs_new_inode(inode, 0);
 124         return inode;
 125
 126 fail:
 127         trace_f2fs_new_inode(inode, err);
 128         make_bad_inode(inode);
 129         if (nid_free)
 130                 set_inode_flag(inode, FI_FREE_NID);
 131         iput(inode);
 132         return ERR_PTR(err);
 133 fail_drop:
 134         trace_f2fs_new_inode(inode, err);
 135         dquot_drop(inode);
 136         inode->i_flags |= S_NOQUOTA;
 137         if (nid_free)
 138                 set_inode_flag(inode, FI_FREE_NID);
 139         clear_nlink(inode);
 140         unlock_new_inode(inode);
 141         iput(inode);
 142         return ERR_PTR(err);
 143 }
 144
 145 static int is_multimedia_file(const unsigned char *s, const char *sub)
 146 {
 147         size_t slen = strlen(s);
 148         size_t sublen = strlen(sub);
 149         int i;
 150
 151         /*
 152          * filename format of multimedia file should be defined as:
 153          * "filename + '.' + extension + (optional: '.' + temp extension)".
 154          */
 155         if (slen < sublen + 2)
 156                 return 0;
 157
 158         for (i = 1; i < slen - sublen; i++) {
 159                 if (s[i] != '.')
 160                         continue;
 161                 if (!strncasecmp(s + i + 1, sub, sublen))
 162                         return 1;
 163         }
 164
 165         return 0;
 166 }
 167
 168 /*
 169  * Set multimedia files as cold files for hot/cold data separation
 170  */
 171 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
 172                 const unsigned char *name)
 173 {
 174         int i;
 175         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
 176
 177         int count = le32_to_cpu(sbi->raw_super->extension_count);
 178         for (i = 0; i < count; i++) {
 179                 if (is_multimedia_file(name, extlist[i])) {
 180                         file_set_cold(inode);
 181                         break;
 182                 }
 183         }
 184 }
 185
 186 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 187                                                 bool excl)
 188 {
 189         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 190         struct inode *inode;
 191         nid_t ino = 0;
 192         int err;
 193
 194         if (unlikely(f2fs_cp_error(sbi)))
 195                 return -EIO;
 196
 197         err = dquot_initialize(dir);
 198         if (err)
 199                 return err;
 200
 201         inode = f2fs_new_inode(dir, mode);
 202         if (IS_ERR(inode))
 203                 return PTR_ERR(inode);
 204
 205         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 206                 set_cold_files(sbi, inode, dentry->d_name.name);
 207
 208         inode->i_op = &f2fs_file_inode_operations;
 209         inode->i_fop = &f2fs_file_operations;
 210         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 211         ino = inode->i_ino;
 212
 213         f2fs_lock_op(sbi);
 214         err = f2fs_add_link(dentry, inode);
 215         if (err)
 216                 goto out;
 217         f2fs_unlock_op(sbi);
 218
 219         alloc_nid_done(sbi, ino);
 220
 221         d_instantiate(dentry, inode);
 222         unlock_new_inode(inode);
 223
 224         if (IS_DIRSYNC(dir))
 225                 f2fs_sync_fs(sbi->sb, 1);
 226
 227         f2fs_balance_fs(sbi, true);
 228         return 0;
 229 out:
 230         handle_failed_inode(inode);
 231         return err;
 232 }
 233
 234 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 235                 struct dentry *dentry)
 236 {
 237         struct inode *inode = d_inode(old_dentry);
 238         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 239         int err;
 240
 241         if (unlikely(f2fs_cp_error(sbi)))
 242                 return -EIO;
 243
 244         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 245         if (err)
 246                 return err;
 247
 248         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 249                         (!projid_eq(F2FS_I(dir)->i_projid,
 250                         F2FS_I(old_dentry->d_inode)->i_projid)))
 251                 return -EXDEV;
 252
 253         err = dquot_initialize(dir);
 254         if (err)
 255                 return err;
 256
 257         f2fs_balance_fs(sbi, true);
 258
 259         inode->i_ctime = current_time(inode);
 260         ihold(inode);
 261
 262         set_inode_flag(inode, FI_INC_LINK);
 263         f2fs_lock_op(sbi);
 264         err = f2fs_add_link(dentry, inode);
 265         if (err)
 266                 goto out;
 267         f2fs_unlock_op(sbi);
 268
 269         d_instantiate(dentry, inode);
 270
 271         if (IS_DIRSYNC(dir))
 272                 f2fs_sync_fs(sbi->sb, 1);
 273         return 0;
 274 out:
 275         clear_inode_flag(inode, FI_INC_LINK);
 276         iput(inode);
 277         f2fs_unlock_op(sbi);
 278         return err;
 279 }
 280
 281 struct dentry *f2fs_get_parent(struct dentry *child)
 282 {
 283         struct qstr dotdot = QSTR_INIT("..", 2);
 284         struct page *page;
 285         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 286         if (!ino) {
 287                 if (IS_ERR(page))
 288                         return ERR_CAST(page);
 289                 return ERR_PTR(-ENOENT);
 290         }
 291         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 292 }
 293
 294 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 295 {
 296         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 297         struct qstr dot = QSTR_INIT(".", 1);
 298         struct qstr dotdot = QSTR_INIT("..", 2);
 299         struct f2fs_dir_entry *de;
 300         struct page *page;
 301         int err = 0;
 302
 303         if (f2fs_readonly(sbi->sb)) {
 304                 f2fs_msg(sbi->sb, KERN_INFO,
 305                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 306                         "in readonly mountpoint", dir->i_ino, pino);
 307                 return 0;
 308         }
 309
 310         err = dquot_initialize(dir);
 311         if (err)
 312                 return err;
 313
 314         f2fs_balance_fs(sbi, true);
 315
 316         f2fs_lock_op(sbi);
 317
 318         de = f2fs_find_entry(dir, &dot, &page);
 319         if (de) {
 320                 f2fs_dentry_kunmap(dir, page);
 321                 f2fs_put_page(page, 0);
 322         } else if (IS_ERR(page)) {
 323                 err = PTR_ERR(page);
 324                 goto out;
 325         } else {
 326                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 327                 if (err)
 328                         goto out;
 329         }
 330
 331         de = f2fs_find_entry(dir, &dotdot, &page);
 332         if (de) {
 333                 f2fs_dentry_kunmap(dir, page);
 334                 f2fs_put_page(page, 0);
 335         } else if (IS_ERR(page)) {
 336                 err = PTR_ERR(page);
 337         } else {
 338                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 339         }
 340 out:
 341         if (!err)
 342                 clear_inode_flag(dir, FI_INLINE_DOTS);
 343
 344         f2fs_unlock_op(sbi);
 345         return err;
 346 }
 347
 348 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 349                 unsigned int flags)
 350 {
 351         struct inode *inode = NULL;
 352         struct f2fs_dir_entry *de;
 353         struct page *page;
 354         struct dentry *new;
 355         nid_t ino = -1;
 356         int err = 0;
 357         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 358
 359         trace_f2fs_lookup_start(dir, dentry, flags);
 360
 361         err = fscrypt_prepare_lookup(dir, dentry, flags);
 362         if (err)
 363                 goto out;
 364
 365         if (dentry->d_name.len > F2FS_NAME_LEN) {
 366                 err = -ENAMETOOLONG;
 367                 goto out;
 368         }
 369
 370         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 371         if (!de) {
 372                 if (IS_ERR(page)) {
 373                         err = PTR_ERR(page);
 374                         goto out;
 375                 }
 376                 goto out_splice;
 377         }
 378
 379         ino = le32_to_cpu(de->ino);
 380         f2fs_dentry_kunmap(dir, page);
 381         f2fs_put_page(page, 0);
 382
 383         inode = f2fs_iget(dir->i_sb, ino);
 384         if (IS_ERR(inode)) {
 385                 err = PTR_ERR(inode);
 386                 goto out;
 387         }
 388
 389         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 390                 err = __recover_dot_dentries(dir, root_ino);
 391                 if (err)
 392                         goto out_iput;
 393         }
 394
 395         if (f2fs_has_inline_dots(inode)) {
 396                 err = __recover_dot_dentries(inode, dir->i_ino);
 397                 if (err)
 398                         goto out_iput;
 399         }
 400         if (f2fs_encrypted_inode(dir) &&
 401             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 402             !fscrypt_has_permitted_context(dir, inode)) {
 403                 f2fs_msg(inode->i_sb, KERN_WARNING,
 404                          "Inconsistent encryption contexts: %lu/%lu",
 405                          dir->i_ino, inode->i_ino);
 406                 err = -EPERM;
 407                 goto out_iput;
 408         }
 409 out_splice:
 410         new = d_splice_alias(inode, dentry);
 411         if (IS_ERR(new))
 412                 err = PTR_ERR(new);
 413         trace_f2fs_lookup_end(dir, dentry, ino, err);
 414         return new;
 415 out_iput:
 416         iput(inode);
 417 out:
 418         trace_f2fs_lookup_end(dir, dentry, ino, err);
 419         return ERR_PTR(err);
 420 }
 421
 422 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 423 {
 424         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 425         struct inode *inode = d_inode(dentry);
 426         struct f2fs_dir_entry *de;
 427         struct page *page;
 428         int err = -ENOENT;
 429
 430         trace_f2fs_unlink_enter(dir, dentry);
 431
 432         if (unlikely(f2fs_cp_error(sbi)))
 433                 return -EIO;
 434
 435         err = dquot_initialize(dir);
 436         if (err)
 437                 return err;
 438         err = dquot_initialize(inode);
 439         if (err)
 440                 return err;
 441
 442         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 443         if (!de) {
 444                 if (IS_ERR(page))
 445                         err = PTR_ERR(page);
 446                 goto fail;
 447         }
 448
 449         f2fs_balance_fs(sbi, true);
 450
 451         f2fs_lock_op(sbi);
 452         err = acquire_orphan_inode(sbi);
 453         if (err) {
 454                 f2fs_unlock_op(sbi);
 455                 f2fs_dentry_kunmap(dir, page);
 456                 f2fs_put_page(page, 0);
 457                 goto fail;
 458         }
 459         f2fs_delete_entry(de, page, dir, inode);
 460         f2fs_unlock_op(sbi);
 461
 462         if (IS_DIRSYNC(dir))
 463                 f2fs_sync_fs(sbi->sb, 1);
 464 fail:
 465         trace_f2fs_unlink_exit(inode, err);
 466         return err;
 467 }
 468
 469 static const char *f2fs_get_link(struct dentry *dentry,
 470                                  struct inode *inode,
 471                                  struct delayed_call *done)
 472 {
 473         const char *link = page_get_link(dentry, inode, done);
 474         if (!IS_ERR(link) && !*link) {
 475                 /* this is broken symlink case */
 476                 do_delayed_call(done);
 477                 clear_delayed_call(done);
 478                 link = ERR_PTR(-ENOENT);
 479         }
 480         return link;
 481 }
 482
 483 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 484                                         const char *symname)
 485 {
 486         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 487         struct inode *inode;
 488         size_t len = strlen(symname);
 489         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
 490         struct fscrypt_symlink_data *sd = NULL;
 491         int err;
 492
 493         if (unlikely(f2fs_cp_error(sbi)))
 494                 return -EIO;
 495
 496         if (f2fs_encrypted_inode(dir)) {
 497                 err = fscrypt_get_encryption_info(dir);
 498                 if (err)
 499                         return err;
 500
 501                 if (!fscrypt_has_encryption_key(dir))
 502                         return -ENOKEY;
 503
 504                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
 505                                 sizeof(struct fscrypt_symlink_data));
 506         }
 507
 508         if (disk_link.len > dir->i_sb->s_blocksize)
 509                 return -ENAMETOOLONG;
 510
 511         err = dquot_initialize(dir);
 512         if (err)
 513                 return err;
 514
 515         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 516         if (IS_ERR(inode))
 517                 return PTR_ERR(inode);
 518
 519         if (f2fs_encrypted_inode(inode))
 520                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 521         else
 522                 inode->i_op = &f2fs_symlink_inode_operations;
 523         inode_nohighmem(inode);
 524         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 525
 526         f2fs_lock_op(sbi);
 527         err = f2fs_add_link(dentry, inode);
 528         if (err)
 529                 goto out;
 530         f2fs_unlock_op(sbi);
 531         alloc_nid_done(sbi, inode->i_ino);
 532
 533         if (f2fs_encrypted_inode(inode)) {
 534                 struct qstr istr = QSTR_INIT(symname, len);
 535                 struct fscrypt_str ostr;
 536
 537                 sd = f2fs_kzalloc(sbi, disk_link.len, GFP_NOFS);
 538                 if (!sd) {
 539                         err = -ENOMEM;
 540                         goto err_out;
 541                 }
 542
 543                 err = fscrypt_get_encryption_info(inode);
 544                 if (err)
 545                         goto err_out;
 546
 547                 if (!fscrypt_has_encryption_key(inode)) {
 548                         err = -ENOKEY;
 549                         goto err_out;
 550                 }
 551
 552                 ostr.name = sd->encrypted_path;
 553                 ostr.len = disk_link.len;
 554                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
 555                 if (err)
 556                         goto err_out;
 557
 558                 sd->len = cpu_to_le16(ostr.len);
 559                 disk_link.name = (char *)sd;
 560         }
 561
 562         err = page_symlink(inode, disk_link.name, disk_link.len);
 563
 564 err_out:
 565         d_instantiate(dentry, inode);
 566         unlock_new_inode(inode);
 567
 568         /*
 569          * Let's flush symlink data in order to avoid broken symlink as much as
 570          * possible. Nevertheless, fsyncing is the best way, but there is no
 571          * way to get a file descriptor in order to flush that.
 572          *
 573          * Note that, it needs to do dir->fsync to make this recoverable.
 574          * If the symlink path is stored into inline_data, there is no
 575          * performance regression.
 576          */
 577         if (!err) {
 578                 filemap_write_and_wait_range(inode->i_mapping, 0,
 579                                                         disk_link.len - 1);
 580
 581                 if (IS_DIRSYNC(dir))
 582                         f2fs_sync_fs(sbi->sb, 1);
 583         } else {
 584                 f2fs_unlink(dir, dentry);
 585         }
 586
 587         kfree(sd);
 588
 589         f2fs_balance_fs(sbi, true);
 590         return err;
 591 out:
 592         handle_failed_inode(inode);
 593         return err;
 594 }
 595
 596 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 597 {
 598         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 599         struct inode *inode;
 600         int err;
 601
 602         if (unlikely(f2fs_cp_error(sbi)))
 603                 return -EIO;
 604
 605         err = dquot_initialize(dir);
 606         if (err)
 607                 return err;
 608
 609         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 610         if (IS_ERR(inode))
 611                 return PTR_ERR(inode);
 612
 613         inode->i_op = &f2fs_dir_inode_operations;
 614         inode->i_fop = &f2fs_dir_operations;
 615         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 616         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
 617
 618         set_inode_flag(inode, FI_INC_LINK);
 619         f2fs_lock_op(sbi);
 620         err = f2fs_add_link(dentry, inode);
 621         if (err)
 622                 goto out_fail;
 623         f2fs_unlock_op(sbi);
 624
 625         alloc_nid_done(sbi, inode->i_ino);
 626
 627         d_instantiate(dentry, inode);
 628         unlock_new_inode(inode);
 629
 630         if (IS_DIRSYNC(dir))
 631                 f2fs_sync_fs(sbi->sb, 1);
 632
 633         f2fs_balance_fs(sbi, true);
 634         return 0;
 635
 636 out_fail:
 637         clear_inode_flag(inode, FI_INC_LINK);
 638         handle_failed_inode(inode);
 639         return err;
 640 }
 641
 642 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 643 {
 644         struct inode *inode = d_inode(dentry);
 645         if (f2fs_empty_dir(inode))
 646                 return f2fs_unlink(dir, dentry);
 647         return -ENOTEMPTY;
 648 }
 649
 650 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 651                                 umode_t mode, dev_t rdev)
 652 {
 653         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 654         struct inode *inode;
 655         int err = 0;
 656
 657         if (unlikely(f2fs_cp_error(sbi)))
 658                 return -EIO;
 659
 660         err = dquot_initialize(dir);
 661         if (err)
 662                 return err;
 663
 664         inode = f2fs_new_inode(dir, mode);
 665         if (IS_ERR(inode))
 666                 return PTR_ERR(inode);
 667
 668         init_special_inode(inode, inode->i_mode, rdev);
 669         inode->i_op = &f2fs_special_inode_operations;
 670
 671         f2fs_lock_op(sbi);
 672         err = f2fs_add_link(dentry, inode);
 673         if (err)
 674                 goto out;
 675         f2fs_unlock_op(sbi);
 676
 677         alloc_nid_done(sbi, inode->i_ino);
 678
 679         d_instantiate(dentry, inode);
 680         unlock_new_inode(inode);
 681
 682         if (IS_DIRSYNC(dir))
 683                 f2fs_sync_fs(sbi->sb, 1);
 684
 685         f2fs_balance_fs(sbi, true);
 686         return 0;
 687 out:
 688         handle_failed_inode(inode);
 689         return err;
 690 }
 691
 692 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 693                                         umode_t mode, struct inode **whiteout)
 694 {
 695         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 696         struct inode *inode;
 697         int err;
 698
 699         err = dquot_initialize(dir);
 700         if (err)
 701                 return err;
 702
 703         inode = f2fs_new_inode(dir, mode);
 704         if (IS_ERR(inode))
 705                 return PTR_ERR(inode);
 706
 707         if (whiteout) {
 708                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 709                 inode->i_op = &f2fs_special_inode_operations;
 710         } else {
 711                 inode->i_op = &f2fs_file_inode_operations;
 712                 inode->i_fop = &f2fs_file_operations;
 713                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 714         }
 715
 716         f2fs_lock_op(sbi);
 717         err = acquire_orphan_inode(sbi);
 718         if (err)
 719                 goto out;
 720
 721         err = f2fs_do_tmpfile(inode, dir);
 722         if (err)
 723                 goto release_out;
 724
 725         /*
 726          * add this non-linked tmpfile to orphan list, in this way we could
 727          * remove all unused data of tmpfile after abnormal power-off.
 728          */
 729         add_orphan_inode(inode);
 730         alloc_nid_done(sbi, inode->i_ino);
 731
 732         if (whiteout) {
 733                 f2fs_i_links_write(inode, false);
 734                 *whiteout = inode;
 735         } else {
 736                 d_tmpfile(dentry, inode);
 737         }
 738         /* link_count was changed by d_tmpfile as well. */
 739         f2fs_unlock_op(sbi);
 740         unlock_new_inode(inode);
 741
 742         f2fs_balance_fs(sbi, true);
 743         return 0;
 744
 745 release_out:
 746         release_orphan_inode(sbi);
 747 out:
 748         handle_failed_inode(inode);
 749         return err;
 750 }
 751
 752 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 753 {
 754         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 755                 return -EIO;
 756
 757         if (f2fs_encrypted_inode(dir)) {
 758                 int err = fscrypt_get_encryption_info(dir);
 759                 if (err)
 760                         return err;
 761         }
 762
 763         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 764 }
 765
 766 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 767 {
 768         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 769                 return -EIO;
 770
 771         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 772 }
 773
 774 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 775                         struct inode *new_dir, struct dentry *new_dentry,
 776                         unsigned int flags)
 777 {
 778         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 779         struct inode *old_inode = d_inode(old_dentry);
 780         struct inode *new_inode = d_inode(new_dentry);
 781         struct inode *whiteout = NULL;
 782         struct page *old_dir_page;
 783         struct page *old_page, *new_page = NULL;
 784         struct f2fs_dir_entry *old_dir_entry = NULL;
 785         struct f2fs_dir_entry *old_entry;
 786         struct f2fs_dir_entry *new_entry;
 787         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 788         int err = -ENOENT;
 789
 790         if (unlikely(f2fs_cp_error(sbi)))
 791                 return -EIO;
 792
 793         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 794                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 795                         F2FS_I(old_dentry->d_inode)->i_projid)))
 796                 return -EXDEV;
 797
 798         err = dquot_initialize(old_dir);
 799         if (err)
 800                 goto out;
 801
 802         err = dquot_initialize(new_dir);
 803         if (err)
 804                 goto out;
 805
 806         if (new_inode) {
 807                 err = dquot_initialize(new_inode);
 808                 if (err)
 809                         goto out;
 810         }
 811
 812         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 813         if (!old_entry) {
 814                 if (IS_ERR(old_page))
 815                         err = PTR_ERR(old_page);
 816                 goto out;
 817         }
 818
 819         if (S_ISDIR(old_inode->i_mode)) {
 820                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 821                 if (!old_dir_entry) {
 822                         if (IS_ERR(old_dir_page))
 823                                 err = PTR_ERR(old_dir_page);
 824                         goto out_old;
 825                 }
 826         }
 827
 828         if (flags & RENAME_WHITEOUT) {
 829                 err = f2fs_create_whiteout(old_dir, &whiteout);
 830                 if (err)
 831                         goto out_dir;
 832         }
 833
 834         if (new_inode) {
 835
 836                 err = -ENOTEMPTY;
 837                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 838                         goto out_whiteout;
 839
 840                 err = -ENOENT;
 841                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 842                                                 &new_page);
 843                 if (!new_entry) {
 844                         if (IS_ERR(new_page))
 845                                 err = PTR_ERR(new_page);
 846                         goto out_whiteout;
 847                 }
 848
 849                 f2fs_balance_fs(sbi, true);
 850
 851                 f2fs_lock_op(sbi);
 852
 853                 err = acquire_orphan_inode(sbi);
 854                 if (err)
 855                         goto put_out_dir;
 856
 857                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 858
 859                 new_inode->i_ctime = current_time(new_inode);
 860                 down_write(&F2FS_I(new_inode)->i_sem);
 861                 if (old_dir_entry)
 862                         f2fs_i_links_write(new_inode, false);
 863                 f2fs_i_links_write(new_inode, false);
 864                 up_write(&F2FS_I(new_inode)->i_sem);
 865
 866                 if (!new_inode->i_nlink)
 867                         add_orphan_inode(new_inode);
 868                 else
 869                         release_orphan_inode(sbi);
 870         } else {
 871                 f2fs_balance_fs(sbi, true);
 872
 873                 f2fs_lock_op(sbi);
 874
 875                 err = f2fs_add_link(new_dentry, old_inode);
 876                 if (err) {
 877                         f2fs_unlock_op(sbi);
 878                         goto out_whiteout;
 879                 }
 880
 881                 if (old_dir_entry)
 882                         f2fs_i_links_write(new_dir, true);
 883
 884                 /*
 885                  * old entry and new entry can locate in the same inline
 886                  * dentry in inode, when attaching new entry in inline dentry,
 887                  * it could force inline dentry conversion, after that,
 888                  * old_entry and old_page will point to wrong address, in
 889                  * order to avoid this, let's do the check and update here.
 890                  */
 891                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 892                         f2fs_put_page(old_page, 0);
 893                         old_page = NULL;
 894
 895                         old_entry = f2fs_find_entry(old_dir,
 896                                                 &old_dentry->d_name, &old_page);
 897                         if (!old_entry) {
 898                                 err = -ENOENT;
 899                                 if (IS_ERR(old_page))
 900                                         err = PTR_ERR(old_page);
 901                                 f2fs_unlock_op(sbi);
 902                                 goto out_whiteout;
 903                         }
 904                 }
 905         }
 906
 907         down_write(&F2FS_I(old_inode)->i_sem);
 908         if (!old_dir_entry || whiteout)
 909                 file_lost_pino(old_inode);
 910         else
 911                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 912         up_write(&F2FS_I(old_inode)->i_sem);
 913
 914         old_inode->i_ctime = current_time(old_inode);
 915         f2fs_mark_inode_dirty_sync(old_inode, false);
 916
 917         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 918
 919         if (whiteout) {
 920                 whiteout->i_state |= I_LINKABLE;
 921                 set_inode_flag(whiteout, FI_INC_LINK);
 922                 err = f2fs_add_link(old_dentry, whiteout);
 923                 if (err)
 924                         goto put_out_dir;
 925                 whiteout->i_state &= ~I_LINKABLE;
 926                 iput(whiteout);
 927         }
 928
 929         if (old_dir_entry) {
 930                 if (old_dir != new_dir && !whiteout) {
 931                         f2fs_set_link(old_inode, old_dir_entry,
 932                                                 old_dir_page, new_dir);
 933                 } else {
 934                         f2fs_dentry_kunmap(old_inode, old_dir_page);
 935                         f2fs_put_page(old_dir_page, 0);
 936                 }
 937                 f2fs_i_links_write(old_dir, false);
 938         }
 939         add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 940
 941         f2fs_unlock_op(sbi);
 942
 943         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
 944                 f2fs_sync_fs(sbi->sb, 1);
 945         return 0;
 946
 947 put_out_dir:
 948         f2fs_unlock_op(sbi);
 949         if (new_page) {
 950                 f2fs_dentry_kunmap(new_dir, new_page);
 951                 f2fs_put_page(new_page, 0);
 952         }
 953 out_whiteout:
 954         if (whiteout)
 955                 iput(whiteout);
 956 out_dir:
 957         if (old_dir_entry) {
 958                 f2fs_dentry_kunmap(old_inode, old_dir_page);
 959                 f2fs_put_page(old_dir_page, 0);
 960         }
 961 out_old:
 962         f2fs_dentry_kunmap(old_dir, old_page);
 963         f2fs_put_page(old_page, 0);
 964 out:
 965         return err;
 966 }
 967
 968 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 969                              struct inode *new_dir, struct dentry *new_dentry)
 970 {
 971         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 972         struct inode *old_inode = d_inode(old_dentry);
 973         struct inode *new_inode = d_inode(new_dentry);
 974         struct page *old_dir_page, *new_dir_page;
 975         struct page *old_page, *new_page;
 976         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
 977         struct f2fs_dir_entry *old_entry, *new_entry;
 978         int old_nlink = 0, new_nlink = 0;
 979         int err = -ENOENT;
 980
 981         if (unlikely(f2fs_cp_error(sbi)))
 982                 return -EIO;
 983
 984         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 985                         !projid_eq(F2FS_I(new_dir)->i_projid,
 986                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
 987             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 988                         !projid_eq(F2FS_I(old_dir)->i_projid,
 989                         F2FS_I(new_dentry->d_inode)->i_projid)))
 990                 return -EXDEV;
 991
 992         err = dquot_initialize(old_dir);
 993         if (err)
 994                 goto out;
 995
 996         err = dquot_initialize(new_dir);
 997         if (err)
 998                 goto out;
 999
1000         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1001         if (!old_entry) {
1002                 if (IS_ERR(old_page))
1003                         err = PTR_ERR(old_page);
1004                 goto out;
1005         }
1006
1007         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1008         if (!new_entry) {
1009                 if (IS_ERR(new_page))
1010                         err = PTR_ERR(new_page);
1011                 goto out_old;
1012         }
1013
1014         /* prepare for updating ".." directory entry info later */
1015         if (old_dir != new_dir) {
1016                 if (S_ISDIR(old_inode->i_mode)) {
1017                         old_dir_entry = f2fs_parent_dir(old_inode,
1018                                                         &old_dir_page);
1019                         if (!old_dir_entry) {
1020                                 if (IS_ERR(old_dir_page))
1021                                         err = PTR_ERR(old_dir_page);
1022                                 goto out_new;
1023                         }
1024                 }
1025
1026                 if (S_ISDIR(new_inode->i_mode)) {
1027                         new_dir_entry = f2fs_parent_dir(new_inode,
1028                                                         &new_dir_page);
1029                         if (!new_dir_entry) {
1030                                 if (IS_ERR(new_dir_page))
1031                                         err = PTR_ERR(new_dir_page);
1032                                 goto out_old_dir;
1033                         }
1034                 }
1035         }
1036
1037         /*
1038          * If cross rename between file and directory those are not
1039          * in the same directory, we will inc nlink of file's parent
1040          * later, so we should check upper boundary of its nlink.
1041          */
1042         if ((!old_dir_entry || !new_dir_entry) &&
1043                                 old_dir_entry != new_dir_entry) {
1044                 old_nlink = old_dir_entry ? -1 : 1;
1045                 new_nlink = -old_nlink;
1046                 err = -EMLINK;
1047                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1048                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1049                         goto out_new_dir;
1050         }
1051
1052         f2fs_balance_fs(sbi, true);
1053
1054         f2fs_lock_op(sbi);
1055
1056         /* update ".." directory entry info of old dentry */
1057         if (old_dir_entry)
1058                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1059
1060         /* update ".." directory entry info of new dentry */
1061         if (new_dir_entry)
1062                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1063
1064         /* update directory entry info of old dir inode */
1065         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1066
1067         down_write(&F2FS_I(old_inode)->i_sem);
1068         file_lost_pino(old_inode);
1069         up_write(&F2FS_I(old_inode)->i_sem);
1070
1071         old_dir->i_ctime = current_time(old_dir);
1072         if (old_nlink) {
1073                 down_write(&F2FS_I(old_dir)->i_sem);
1074                 f2fs_i_links_write(old_dir, old_nlink > 0);
1075                 up_write(&F2FS_I(old_dir)->i_sem);
1076         }
1077         f2fs_mark_inode_dirty_sync(old_dir, false);
1078
1079         /* update directory entry info of new dir inode */
1080         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1081
1082         down_write(&F2FS_I(new_inode)->i_sem);
1083         file_lost_pino(new_inode);
1084         up_write(&F2FS_I(new_inode)->i_sem);
1085
1086         new_dir->i_ctime = current_time(new_dir);
1087         if (new_nlink) {
1088                 down_write(&F2FS_I(new_dir)->i_sem);
1089                 f2fs_i_links_write(new_dir, new_nlink > 0);
1090                 up_write(&F2FS_I(new_dir)->i_sem);
1091         }
1092         f2fs_mark_inode_dirty_sync(new_dir, false);
1093
1094         add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1095         add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1096
1097         f2fs_unlock_op(sbi);
1098
1099         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1100                 f2fs_sync_fs(sbi->sb, 1);
1101         return 0;
1102 out_new_dir:
1103         if (new_dir_entry) {
1104                 f2fs_dentry_kunmap(new_inode, new_dir_page);
1105                 f2fs_put_page(new_dir_page, 0);
1106         }
1107 out_old_dir:
1108         if (old_dir_entry) {
1109                 f2fs_dentry_kunmap(old_inode, old_dir_page);
1110                 f2fs_put_page(old_dir_page, 0);
1111         }
1112 out_new:
1113         f2fs_dentry_kunmap(new_dir, new_page);
1114         f2fs_put_page(new_page, 0);
1115 out_old:
1116         f2fs_dentry_kunmap(old_dir, old_page);
1117         f2fs_put_page(old_page, 0);
1118 out:
1119         return err;
1120 }
1121
1122 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1123                         struct inode *new_dir, struct dentry *new_dentry,
1124                         unsigned int flags)
1125 {
1126         int err;
1127
1128         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1129                 return -EINVAL;
1130
1131         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1132                                      flags);
1133         if (err)
1134                 return err;
1135
1136         if (flags & RENAME_EXCHANGE) {
1137                 return f2fs_cross_rename(old_dir, old_dentry,
1138                                          new_dir, new_dentry);
1139         }
1140         /*
1141          * VFS has already handled the new dentry existence case,
1142          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1143          */
1144         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1145 }
1146
1147 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1148                                            struct inode *inode,
1149                                            struct delayed_call *done)
1150 {
1151         struct page *cpage = NULL;
1152         char *caddr, *paddr = NULL;
1153         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1154         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1155         struct fscrypt_symlink_data *sd;
1156         u32 max_size = inode->i_sb->s_blocksize;
1157         int res;
1158
1159         if (!dentry)
1160                 return ERR_PTR(-ECHILD);
1161
1162         res = fscrypt_get_encryption_info(inode);
1163         if (res)
1164                 return ERR_PTR(res);
1165
1166         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1167         if (IS_ERR(cpage))
1168                 return ERR_CAST(cpage);
1169         caddr = page_address(cpage);
1170
1171         /* Symlink is encrypted */
1172         sd = (struct fscrypt_symlink_data *)caddr;
1173         cstr.name = sd->encrypted_path;
1174         cstr.len = le16_to_cpu(sd->len);
1175
1176         /* this is broken symlink case */
1177         if (unlikely(cstr.len == 0)) {
1178                 res = -ENOENT;
1179                 goto errout;
1180         }
1181
1182         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1183                 /* Symlink data on the disk is corrupted */
1184                 res = -EIO;
1185                 goto errout;
1186         }
1187         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1188         if (res)
1189                 goto errout;
1190
1191         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1192         if (res)
1193                 goto errout;
1194
1195         /* this is broken symlink case */
1196         if (unlikely(pstr.name[0] == 0)) {
1197                 res = -ENOENT;
1198                 goto errout;
1199         }
1200
1201         paddr = pstr.name;
1202
1203         /* Null-terminate the name */
1204         paddr[pstr.len] = '\0';
1205
1206         put_page(cpage);
1207         set_delayed_call(done, kfree_link, paddr);
1208         return paddr;
1209 errout:
1210         fscrypt_fname_free_buffer(&pstr);
1211         put_page(cpage);
1212         return ERR_PTR(res);
1213 }
1214
1215 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1216         .get_link       = f2fs_encrypted_get_link,
1217         .getattr        = f2fs_getattr,
1218         .setattr        = f2fs_setattr,
1219 #ifdef CONFIG_F2FS_FS_XATTR
1220         .listxattr      = f2fs_listxattr,
1221 #endif
1222 };
1223
1224 const struct inode_operations f2fs_dir_inode_operations = {
1225         .create         = f2fs_create,
1226         .lookup         = f2fs_lookup,
1227         .link           = f2fs_link,
1228         .unlink         = f2fs_unlink,
1229         .symlink        = f2fs_symlink,
1230         .mkdir          = f2fs_mkdir,
1231         .rmdir          = f2fs_rmdir,
1232         .mknod          = f2fs_mknod,
1233         .rename         = f2fs_rename2,
1234         .tmpfile        = f2fs_tmpfile,
1235         .getattr        = f2fs_getattr,
1236         .setattr        = f2fs_setattr,
1237         .get_acl        = f2fs_get_acl,
1238         .set_acl        = f2fs_set_acl,
1239 #ifdef CONFIG_F2FS_FS_XATTR
1240         .listxattr      = f2fs_listxattr,
1241 #endif
1242 };
1243
1244 const struct inode_operations f2fs_symlink_inode_operations = {
1245         .get_link       = f2fs_get_link,
1246         .getattr        = f2fs_getattr,
1247         .setattr        = f2fs_setattr,
1248 #ifdef CONFIG_F2FS_FS_XATTR
1249         .listxattr      = f2fs_listxattr,
1250 #endif
1251 };
1252
1253 const struct inode_operations f2fs_special_inode_operations = {
1254         .getattr        = f2fs_getattr,
1255         .setattr        = f2fs_setattr,
1256         .get_acl        = f2fs_get_acl,
1257         .set_acl        = f2fs_set_acl,
1258 #ifdef CONFIG_F2FS_FS_XATTR
1259         .listxattr      = f2fs_listxattr,
1260 #endif
1261 };