fs/f2fs/namei.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * fs/f2fs/namei.c
   4  *
   5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   6  *             http://www.samsung.com/
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/f2fs_fs.h>
  10 #include <linux/pagemap.h>
  11 #include <linux/sched.h>
  12 #include <linux/ctype.h>
  13 #include <linux/random.h>
  14 #include <linux/dcache.h>
  15 #include <linux/namei.h>
  16 #include <linux/quotaops.h>
  17
  18 #include "f2fs.h"
  19 #include "node.h"
  20 #include "segment.h"
  21 #include "xattr.h"
  22 #include "acl.h"
  23 #include <trace/events/f2fs.h>
  24
  25 static struct inode *f2fs_new_inode(struct user_namespace *mnt_userns,
  26                                                 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         bool encrypt = false;
  33         int xattr_size = 0;
  34         int err;
  35
  36         inode = new_inode(dir->i_sb);
  37         if (!inode)
  38                 return ERR_PTR(-ENOMEM);
  39
  40         f2fs_lock_op(sbi);
  41         if (!f2fs_alloc_nid(sbi, &ino)) {
  42                 f2fs_unlock_op(sbi);
  43                 err = -ENOSPC;
  44                 goto fail;
  45         }
  46         f2fs_unlock_op(sbi);
  47
  48         nid_free = true;
  49
  50         inode_init_owner(mnt_userns, inode, dir, mode);
  51
  52         inode->i_ino = ino;
  53         inode->i_blocks = 0;
  54         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
  55         F2FS_I(inode)->i_crtime = inode->i_mtime;
  56         inode->i_generation = prandom_u32();
  57
  58         if (S_ISDIR(inode->i_mode))
  59                 F2FS_I(inode)->i_current_depth = 1;
  60
  61         err = insert_inode_locked(inode);
  62         if (err) {
  63                 err = -EINVAL;
  64                 goto fail;
  65         }
  66
  67         if (f2fs_sb_has_project_quota(sbi) &&
  68                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
  69                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  70         else
  71                 F2FS_I(inode)->i_projid = make_kprojid(mnt_userns,
  72                                                         F2FS_DEF_PROJID);
  73
  74         err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
  75         if (err)
  76                 goto fail_drop;
  77
  78         err = f2fs_dquot_initialize(inode);
  79         if (err)
  80                 goto fail_drop;
  81
  82         set_inode_flag(inode, FI_NEW_INODE);
  83
  84         if (encrypt)
  85                 f2fs_set_encrypted_inode(inode);
  86
  87         if (f2fs_sb_has_extra_attr(sbi)) {
  88                 set_inode_flag(inode, FI_EXTRA_ATTR);
  89                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  90         }
  91
  92         if (test_opt(sbi, INLINE_XATTR))
  93                 set_inode_flag(inode, FI_INLINE_XATTR);
  94
  95         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  96                 set_inode_flag(inode, FI_INLINE_DATA);
  97         if (f2fs_may_inline_dentry(inode))
  98                 set_inode_flag(inode, FI_INLINE_DENTRY);
  99
 100         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
 101                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
 102                 if (f2fs_has_inline_xattr(inode))
 103                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 104                 /* Otherwise, will be 0 */
 105         } else if (f2fs_has_inline_xattr(inode) ||
 106                                 f2fs_has_inline_dentry(inode)) {
 107                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 108         }
 109         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 110
 111         f2fs_init_extent_tree(inode, NULL);
 112
 113         stat_inc_inline_xattr(inode);
 114         stat_inc_inline_inode(inode);
 115         stat_inc_inline_dir(inode);
 116
 117         F2FS_I(inode)->i_flags =
 118                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 119
 120         if (S_ISDIR(inode->i_mode))
 121                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 122
 123         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 124                 set_inode_flag(inode, FI_PROJ_INHERIT);
 125
 126         if (f2fs_sb_has_compression(sbi)) {
 127                 /* Inherit the compression flag in directory */
 128                 if ((F2FS_I(dir)->i_flags & F2FS_COMPR_FL) &&
 129                                         f2fs_may_compress(inode))
 130                         set_compress_context(inode);
 131         }
 132
 133         f2fs_set_inode_flags(inode);
 134
 135         trace_f2fs_new_inode(inode, 0);
 136         return inode;
 137
 138 fail:
 139         trace_f2fs_new_inode(inode, err);
 140         make_bad_inode(inode);
 141         if (nid_free)
 142                 set_inode_flag(inode, FI_FREE_NID);
 143         iput(inode);
 144         return ERR_PTR(err);
 145 fail_drop:
 146         trace_f2fs_new_inode(inode, err);
 147         dquot_drop(inode);
 148         inode->i_flags |= S_NOQUOTA;
 149         if (nid_free)
 150                 set_inode_flag(inode, FI_FREE_NID);
 151         clear_nlink(inode);
 152         unlock_new_inode(inode);
 153         iput(inode);
 154         return ERR_PTR(err);
 155 }
 156
 157 static inline int is_extension_exist(const unsigned char *s, const char *sub,
 158                                                 bool tmp_ext)
 159 {
 160         size_t slen = strlen(s);
 161         size_t sublen = strlen(sub);
 162         int i;
 163
 164         if (sublen == 1 && *sub == '*')
 165                 return 1;
 166
 167         /*
 168          * filename format of multimedia file should be defined as:
 169          * "filename + '.' + extension + (optional: '.' + temp extension)".
 170          */
 171         if (slen < sublen + 2)
 172                 return 0;
 173
 174         if (!tmp_ext) {
 175                 /* file has no temp extension */
 176                 if (s[slen - sublen - 1] != '.')
 177                         return 0;
 178                 return !strncasecmp(s + slen - sublen, sub, sublen);
 179         }
 180
 181         for (i = 1; i < slen - sublen; i++) {
 182                 if (s[i] != '.')
 183                         continue;
 184                 if (!strncasecmp(s + i + 1, sub, sublen))
 185                         return 1;
 186         }
 187
 188         return 0;
 189 }
 190
 191 /*
 192  * Set file's temperature for hot/cold data separation
 193  */
 194 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 195                 const unsigned char *name)
 196 {
 197         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 198         int i, cold_count, hot_count;
 199
 200         f2fs_down_read(&sbi->sb_lock);
 201
 202         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 203         hot_count = sbi->raw_super->hot_ext_count;
 204
 205         for (i = 0; i < cold_count + hot_count; i++) {
 206                 if (is_extension_exist(name, extlist[i], true))
 207                         break;
 208         }
 209
 210         f2fs_up_read(&sbi->sb_lock);
 211
 212         if (i == cold_count + hot_count)
 213                 return;
 214
 215         if (i < cold_count)
 216                 file_set_cold(inode);
 217         else
 218                 file_set_hot(inode);
 219 }
 220
 221 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 222                                                         bool hot, bool set)
 223 {
 224         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 225         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 226         int hot_count = sbi->raw_super->hot_ext_count;
 227         int total_count = cold_count + hot_count;
 228         int start, count;
 229         int i;
 230
 231         if (set) {
 232                 if (total_count == F2FS_MAX_EXTENSION)
 233                         return -EINVAL;
 234         } else {
 235                 if (!hot && !cold_count)
 236                         return -EINVAL;
 237                 if (hot && !hot_count)
 238                         return -EINVAL;
 239         }
 240
 241         if (hot) {
 242                 start = cold_count;
 243                 count = total_count;
 244         } else {
 245                 start = 0;
 246                 count = cold_count;
 247         }
 248
 249         for (i = start; i < count; i++) {
 250                 if (strcmp(name, extlist[i]))
 251                         continue;
 252
 253                 if (set)
 254                         return -EINVAL;
 255
 256                 memcpy(extlist[i], extlist[i + 1],
 257                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 258                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 259                 if (hot)
 260                         sbi->raw_super->hot_ext_count = hot_count - 1;
 261                 else
 262                         sbi->raw_super->extension_count =
 263                                                 cpu_to_le32(cold_count - 1);
 264                 return 0;
 265         }
 266
 267         if (!set)
 268                 return -EINVAL;
 269
 270         if (hot) {
 271                 memcpy(extlist[count], name, strlen(name));
 272                 sbi->raw_super->hot_ext_count = hot_count + 1;
 273         } else {
 274                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 275
 276                 memcpy(buf, &extlist[cold_count],
 277                                 F2FS_EXTENSION_LEN * hot_count);
 278                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 279                 memcpy(extlist[cold_count], name, strlen(name));
 280                 memcpy(&extlist[cold_count + 1], buf,
 281                                 F2FS_EXTENSION_LEN * hot_count);
 282                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 283         }
 284         return 0;
 285 }
 286
 287 static void set_compress_inode(struct f2fs_sb_info *sbi, struct inode *inode,
 288                                                 const unsigned char *name)
 289 {
 290         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 291         unsigned char (*noext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).noextensions;
 292         unsigned char (*ext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).extensions;
 293         unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
 294         unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
 295         int i, cold_count, hot_count;
 296
 297         if (!f2fs_sb_has_compression(sbi) ||
 298                         F2FS_I(inode)->i_flags & F2FS_NOCOMP_FL ||
 299                         !f2fs_may_compress(inode) ||
 300                         (!ext_cnt && !noext_cnt))
 301                 return;
 302
 303         f2fs_down_read(&sbi->sb_lock);
 304
 305         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 306         hot_count = sbi->raw_super->hot_ext_count;
 307
 308         for (i = cold_count; i < cold_count + hot_count; i++) {
 309                 if (is_extension_exist(name, extlist[i], false)) {
 310                         f2fs_up_read(&sbi->sb_lock);
 311                         return;
 312                 }
 313         }
 314
 315         f2fs_up_read(&sbi->sb_lock);
 316
 317         for (i = 0; i < noext_cnt; i++) {
 318                 if (is_extension_exist(name, noext[i], false)) {
 319                         f2fs_disable_compressed_file(inode);
 320                         return;
 321                 }
 322         }
 323
 324         if (is_inode_flag_set(inode, FI_COMPRESSED_FILE))
 325                 return;
 326
 327         for (i = 0; i < ext_cnt; i++) {
 328                 if (!is_extension_exist(name, ext[i], false))
 329                         continue;
 330
 331                 set_compress_context(inode);
 332                 return;
 333         }
 334 }
 335
 336 static int f2fs_create(struct user_namespace *mnt_userns, struct inode *dir,
 337                        struct dentry *dentry, umode_t mode, bool excl)
 338 {
 339         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 340         struct inode *inode;
 341         nid_t ino = 0;
 342         int err;
 343
 344         if (unlikely(f2fs_cp_error(sbi)))
 345                 return -EIO;
 346         if (!f2fs_is_checkpoint_ready(sbi))
 347                 return -ENOSPC;
 348
 349         err = f2fs_dquot_initialize(dir);
 350         if (err)
 351                 return err;
 352
 353         inode = f2fs_new_inode(mnt_userns, dir, mode);
 354         if (IS_ERR(inode))
 355                 return PTR_ERR(inode);
 356
 357         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 358                 set_file_temperature(sbi, inode, dentry->d_name.name);
 359
 360         set_compress_inode(sbi, inode, dentry->d_name.name);
 361
 362         inode->i_op = &f2fs_file_inode_operations;
 363         inode->i_fop = &f2fs_file_operations;
 364         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 365         ino = inode->i_ino;
 366
 367         f2fs_lock_op(sbi);
 368         err = f2fs_add_link(dentry, inode);
 369         if (err)
 370                 goto out;
 371         f2fs_unlock_op(sbi);
 372
 373         f2fs_alloc_nid_done(sbi, ino);
 374
 375         d_instantiate_new(dentry, inode);
 376
 377         if (IS_DIRSYNC(dir))
 378                 f2fs_sync_fs(sbi->sb, 1);
 379
 380         f2fs_balance_fs(sbi, true);
 381         return 0;
 382 out:
 383         f2fs_handle_failed_inode(inode);
 384         return err;
 385 }
 386
 387 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 388                 struct dentry *dentry)
 389 {
 390         struct inode *inode = d_inode(old_dentry);
 391         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 392         int err;
 393
 394         if (unlikely(f2fs_cp_error(sbi)))
 395                 return -EIO;
 396         if (!f2fs_is_checkpoint_ready(sbi))
 397                 return -ENOSPC;
 398
 399         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 400         if (err)
 401                 return err;
 402
 403         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 404                         (!projid_eq(F2FS_I(dir)->i_projid,
 405                         F2FS_I(old_dentry->d_inode)->i_projid)))
 406                 return -EXDEV;
 407
 408         err = f2fs_dquot_initialize(dir);
 409         if (err)
 410                 return err;
 411
 412         f2fs_balance_fs(sbi, true);
 413
 414         inode->i_ctime = current_time(inode);
 415         ihold(inode);
 416
 417         set_inode_flag(inode, FI_INC_LINK);
 418         f2fs_lock_op(sbi);
 419         err = f2fs_add_link(dentry, inode);
 420         if (err)
 421                 goto out;
 422         f2fs_unlock_op(sbi);
 423
 424         d_instantiate(dentry, inode);
 425
 426         if (IS_DIRSYNC(dir))
 427                 f2fs_sync_fs(sbi->sb, 1);
 428         return 0;
 429 out:
 430         clear_inode_flag(inode, FI_INC_LINK);
 431         iput(inode);
 432         f2fs_unlock_op(sbi);
 433         return err;
 434 }
 435
 436 struct dentry *f2fs_get_parent(struct dentry *child)
 437 {
 438         struct page *page;
 439         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot_name, &page);
 440
 441         if (!ino) {
 442                 if (IS_ERR(page))
 443                         return ERR_CAST(page);
 444                 return ERR_PTR(-ENOENT);
 445         }
 446         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 447 }
 448
 449 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 450 {
 451         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 452         struct qstr dot = QSTR_INIT(".", 1);
 453         struct qstr dotdot = QSTR_INIT("..", 2);
 454         struct f2fs_dir_entry *de;
 455         struct page *page;
 456         int err = 0;
 457
 458         if (f2fs_readonly(sbi->sb)) {
 459                 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
 460                           dir->i_ino, pino);
 461                 return 0;
 462         }
 463
 464         err = f2fs_dquot_initialize(dir);
 465         if (err)
 466                 return err;
 467
 468         f2fs_balance_fs(sbi, true);
 469
 470         f2fs_lock_op(sbi);
 471
 472         de = f2fs_find_entry(dir, &dot, &page);
 473         if (de) {
 474                 f2fs_put_page(page, 0);
 475         } else if (IS_ERR(page)) {
 476                 err = PTR_ERR(page);
 477                 goto out;
 478         } else {
 479                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 480                 if (err)
 481                         goto out;
 482         }
 483
 484         de = f2fs_find_entry(dir, &dotdot, &page);
 485         if (de)
 486                 f2fs_put_page(page, 0);
 487         else if (IS_ERR(page))
 488                 err = PTR_ERR(page);
 489         else
 490                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 491 out:
 492         if (!err)
 493                 clear_inode_flag(dir, FI_INLINE_DOTS);
 494
 495         f2fs_unlock_op(sbi);
 496         return err;
 497 }
 498
 499 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 500                 unsigned int flags)
 501 {
 502         struct inode *inode = NULL;
 503         struct f2fs_dir_entry *de;
 504         struct page *page;
 505         struct dentry *new;
 506         nid_t ino = -1;
 507         int err = 0;
 508         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 509         struct f2fs_filename fname;
 510
 511         trace_f2fs_lookup_start(dir, dentry, flags);
 512
 513         if (dentry->d_name.len > F2FS_NAME_LEN) {
 514                 err = -ENAMETOOLONG;
 515                 goto out;
 516         }
 517
 518         err = f2fs_prepare_lookup(dir, dentry, &fname);
 519         generic_set_encrypted_ci_d_ops(dentry);
 520         if (err == -ENOENT)
 521                 goto out_splice;
 522         if (err)
 523                 goto out;
 524         de = __f2fs_find_entry(dir, &fname, &page);
 525         f2fs_free_filename(&fname);
 526
 527         if (!de) {
 528                 if (IS_ERR(page)) {
 529                         err = PTR_ERR(page);
 530                         goto out;
 531                 }
 532                 err = -ENOENT;
 533                 goto out_splice;
 534         }
 535
 536         ino = le32_to_cpu(de->ino);
 537         f2fs_put_page(page, 0);
 538
 539         inode = f2fs_iget(dir->i_sb, ino);
 540         if (IS_ERR(inode)) {
 541                 err = PTR_ERR(inode);
 542                 goto out;
 543         }
 544
 545         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 546                 err = __recover_dot_dentries(dir, root_ino);
 547                 if (err)
 548                         goto out_iput;
 549         }
 550
 551         if (f2fs_has_inline_dots(inode)) {
 552                 err = __recover_dot_dentries(inode, dir->i_ino);
 553                 if (err)
 554                         goto out_iput;
 555         }
 556         if (IS_ENCRYPTED(dir) &&
 557             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 558             !fscrypt_has_permitted_context(dir, inode)) {
 559                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
 560                           dir->i_ino, inode->i_ino);
 561                 err = -EPERM;
 562                 goto out_iput;
 563         }
 564 out_splice:
 565 #if IS_ENABLED(CONFIG_UNICODE)
 566         if (!inode && IS_CASEFOLDED(dir)) {
 567                 /* Eventually we want to call d_add_ci(dentry, NULL)
 568                  * for negative dentries in the encoding case as
 569                  * well.  For now, prevent the negative dentry
 570                  * from being cached.
 571                  */
 572                 trace_f2fs_lookup_end(dir, dentry, ino, err);
 573                 return NULL;
 574         }
 575 #endif
 576         new = d_splice_alias(inode, dentry);
 577         err = PTR_ERR_OR_ZERO(new);
 578         trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err);
 579         return new;
 580 out_iput:
 581         iput(inode);
 582 out:
 583         trace_f2fs_lookup_end(dir, dentry, ino, err);
 584         return ERR_PTR(err);
 585 }
 586
 587 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 588 {
 589         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 590         struct inode *inode = d_inode(dentry);
 591         struct f2fs_dir_entry *de;
 592         struct page *page;
 593         int err;
 594
 595         trace_f2fs_unlink_enter(dir, dentry);
 596
 597         if (unlikely(f2fs_cp_error(sbi))) {
 598                 err = -EIO;
 599                 goto fail;
 600         }
 601
 602         err = f2fs_dquot_initialize(dir);
 603         if (err)
 604                 goto fail;
 605         err = f2fs_dquot_initialize(inode);
 606         if (err)
 607                 goto fail;
 608
 609         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 610         if (!de) {
 611                 if (IS_ERR(page))
 612                         err = PTR_ERR(page);
 613                 goto fail;
 614         }
 615
 616         f2fs_balance_fs(sbi, true);
 617
 618         f2fs_lock_op(sbi);
 619         err = f2fs_acquire_orphan_inode(sbi);
 620         if (err) {
 621                 f2fs_unlock_op(sbi);
 622                 f2fs_put_page(page, 0);
 623                 goto fail;
 624         }
 625         f2fs_delete_entry(de, page, dir, inode);
 626 #if IS_ENABLED(CONFIG_UNICODE)
 627         /* VFS negative dentries are incompatible with Encoding and
 628          * Case-insensitiveness. Eventually we'll want avoid
 629          * invalidating the dentries here, alongside with returning the
 630          * negative dentries at f2fs_lookup(), when it is better
 631          * supported by the VFS for the CI case.
 632          */
 633         if (IS_CASEFOLDED(dir))
 634                 d_invalidate(dentry);
 635 #endif
 636         f2fs_unlock_op(sbi);
 637
 638         if (IS_DIRSYNC(dir))
 639                 f2fs_sync_fs(sbi->sb, 1);
 640 fail:
 641         trace_f2fs_unlink_exit(inode, err);
 642         return err;
 643 }
 644
 645 static const char *f2fs_get_link(struct dentry *dentry,
 646                                  struct inode *inode,
 647                                  struct delayed_call *done)
 648 {
 649         const char *link = page_get_link(dentry, inode, done);
 650
 651         if (!IS_ERR(link) && !*link) {
 652                 /* this is broken symlink case */
 653                 do_delayed_call(done);
 654                 clear_delayed_call(done);
 655                 link = ERR_PTR(-ENOENT);
 656         }
 657         return link;
 658 }
 659
 660 static int f2fs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
 661                         struct dentry *dentry, const char *symname)
 662 {
 663         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 664         struct inode *inode;
 665         size_t len = strlen(symname);
 666         struct fscrypt_str disk_link;
 667         int err;
 668
 669         if (unlikely(f2fs_cp_error(sbi)))
 670                 return -EIO;
 671         if (!f2fs_is_checkpoint_ready(sbi))
 672                 return -ENOSPC;
 673
 674         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 675                                       &disk_link);
 676         if (err)
 677                 return err;
 678
 679         err = f2fs_dquot_initialize(dir);
 680         if (err)
 681                 return err;
 682
 683         inode = f2fs_new_inode(mnt_userns, dir, S_IFLNK | S_IRWXUGO);
 684         if (IS_ERR(inode))
 685                 return PTR_ERR(inode);
 686
 687         if (IS_ENCRYPTED(inode))
 688                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 689         else
 690                 inode->i_op = &f2fs_symlink_inode_operations;
 691         inode_nohighmem(inode);
 692         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 693
 694         f2fs_lock_op(sbi);
 695         err = f2fs_add_link(dentry, inode);
 696         if (err)
 697                 goto out_f2fs_handle_failed_inode;
 698         f2fs_unlock_op(sbi);
 699         f2fs_alloc_nid_done(sbi, inode->i_ino);
 700
 701         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 702         if (err)
 703                 goto err_out;
 704
 705         err = page_symlink(inode, disk_link.name, disk_link.len);
 706
 707 err_out:
 708         d_instantiate_new(dentry, inode);
 709
 710         /*
 711          * Let's flush symlink data in order to avoid broken symlink as much as
 712          * possible. Nevertheless, fsyncing is the best way, but there is no
 713          * way to get a file descriptor in order to flush that.
 714          *
 715          * Note that, it needs to do dir->fsync to make this recoverable.
 716          * If the symlink path is stored into inline_data, there is no
 717          * performance regression.
 718          */
 719         if (!err) {
 720                 filemap_write_and_wait_range(inode->i_mapping, 0,
 721                                                         disk_link.len - 1);
 722
 723                 if (IS_DIRSYNC(dir))
 724                         f2fs_sync_fs(sbi->sb, 1);
 725         } else {
 726                 f2fs_unlink(dir, dentry);
 727         }
 728
 729         f2fs_balance_fs(sbi, true);
 730         goto out_free_encrypted_link;
 731
 732 out_f2fs_handle_failed_inode:
 733         f2fs_handle_failed_inode(inode);
 734 out_free_encrypted_link:
 735         if (disk_link.name != (unsigned char *)symname)
 736                 kfree(disk_link.name);
 737         return err;
 738 }
 739
 740 static int f2fs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 741                       struct dentry *dentry, umode_t mode)
 742 {
 743         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 744         struct inode *inode;
 745         int err;
 746
 747         if (unlikely(f2fs_cp_error(sbi)))
 748                 return -EIO;
 749
 750         err = f2fs_dquot_initialize(dir);
 751         if (err)
 752                 return err;
 753
 754         inode = f2fs_new_inode(mnt_userns, dir, S_IFDIR | mode);
 755         if (IS_ERR(inode))
 756                 return PTR_ERR(inode);
 757
 758         inode->i_op = &f2fs_dir_inode_operations;
 759         inode->i_fop = &f2fs_dir_operations;
 760         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 761         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 762
 763         set_inode_flag(inode, FI_INC_LINK);
 764         f2fs_lock_op(sbi);
 765         err = f2fs_add_link(dentry, inode);
 766         if (err)
 767                 goto out_fail;
 768         f2fs_unlock_op(sbi);
 769
 770         f2fs_alloc_nid_done(sbi, inode->i_ino);
 771
 772         d_instantiate_new(dentry, inode);
 773
 774         if (IS_DIRSYNC(dir))
 775                 f2fs_sync_fs(sbi->sb, 1);
 776
 777         f2fs_balance_fs(sbi, true);
 778         return 0;
 779
 780 out_fail:
 781         clear_inode_flag(inode, FI_INC_LINK);
 782         f2fs_handle_failed_inode(inode);
 783         return err;
 784 }
 785
 786 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 787 {
 788         struct inode *inode = d_inode(dentry);
 789
 790         if (f2fs_empty_dir(inode))
 791                 return f2fs_unlink(dir, dentry);
 792         return -ENOTEMPTY;
 793 }
 794
 795 static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
 796                       struct dentry *dentry, umode_t mode, dev_t rdev)
 797 {
 798         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 799         struct inode *inode;
 800         int err = 0;
 801
 802         if (unlikely(f2fs_cp_error(sbi)))
 803                 return -EIO;
 804         if (!f2fs_is_checkpoint_ready(sbi))
 805                 return -ENOSPC;
 806
 807         err = f2fs_dquot_initialize(dir);
 808         if (err)
 809                 return err;
 810
 811         inode = f2fs_new_inode(mnt_userns, dir, mode);
 812         if (IS_ERR(inode))
 813                 return PTR_ERR(inode);
 814
 815         init_special_inode(inode, inode->i_mode, rdev);
 816         inode->i_op = &f2fs_special_inode_operations;
 817
 818         f2fs_lock_op(sbi);
 819         err = f2fs_add_link(dentry, inode);
 820         if (err)
 821                 goto out;
 822         f2fs_unlock_op(sbi);
 823
 824         f2fs_alloc_nid_done(sbi, inode->i_ino);
 825
 826         d_instantiate_new(dentry, inode);
 827
 828         if (IS_DIRSYNC(dir))
 829                 f2fs_sync_fs(sbi->sb, 1);
 830
 831         f2fs_balance_fs(sbi, true);
 832         return 0;
 833 out:
 834         f2fs_handle_failed_inode(inode);
 835         return err;
 836 }
 837
 838 static int __f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 839                                         struct dentry *dentry, umode_t mode,
 840                                         struct inode **whiteout)
 841 {
 842         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 843         struct inode *inode;
 844         int err;
 845
 846         err = f2fs_dquot_initialize(dir);
 847         if (err)
 848                 return err;
 849
 850         inode = f2fs_new_inode(mnt_userns, dir, mode);
 851         if (IS_ERR(inode))
 852                 return PTR_ERR(inode);
 853
 854         if (whiteout) {
 855                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 856                 inode->i_op = &f2fs_special_inode_operations;
 857         } else {
 858                 inode->i_op = &f2fs_file_inode_operations;
 859                 inode->i_fop = &f2fs_file_operations;
 860                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 861         }
 862
 863         f2fs_lock_op(sbi);
 864         err = f2fs_acquire_orphan_inode(sbi);
 865         if (err)
 866                 goto out;
 867
 868         err = f2fs_do_tmpfile(inode, dir);
 869         if (err)
 870                 goto release_out;
 871
 872         /*
 873          * add this non-linked tmpfile to orphan list, in this way we could
 874          * remove all unused data of tmpfile after abnormal power-off.
 875          */
 876         f2fs_add_orphan_inode(inode);
 877         f2fs_alloc_nid_done(sbi, inode->i_ino);
 878
 879         if (whiteout) {
 880                 f2fs_i_links_write(inode, false);
 881
 882                 spin_lock(&inode->i_lock);
 883                 inode->i_state |= I_LINKABLE;
 884                 spin_unlock(&inode->i_lock);
 885
 886                 *whiteout = inode;
 887         } else {
 888                 d_tmpfile(dentry, inode);
 889         }
 890         /* link_count was changed by d_tmpfile as well. */
 891         f2fs_unlock_op(sbi);
 892         unlock_new_inode(inode);
 893
 894         f2fs_balance_fs(sbi, true);
 895         return 0;
 896
 897 release_out:
 898         f2fs_release_orphan_inode(sbi);
 899 out:
 900         f2fs_handle_failed_inode(inode);
 901         return err;
 902 }
 903
 904 static int f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 905                         struct dentry *dentry, umode_t mode)
 906 {
 907         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 908
 909         if (unlikely(f2fs_cp_error(sbi)))
 910                 return -EIO;
 911         if (!f2fs_is_checkpoint_ready(sbi))
 912                 return -ENOSPC;
 913
 914         return __f2fs_tmpfile(mnt_userns, dir, dentry, mode, NULL);
 915 }
 916
 917 static int f2fs_create_whiteout(struct user_namespace *mnt_userns,
 918                                 struct inode *dir, struct inode **whiteout)
 919 {
 920         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 921                 return -EIO;
 922
 923         return __f2fs_tmpfile(mnt_userns, dir, NULL,
 924                                 S_IFCHR | WHITEOUT_MODE, whiteout);
 925 }
 926
 927 static int f2fs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
 928                         struct dentry *old_dentry, struct inode *new_dir,
 929                         struct dentry *new_dentry, unsigned int flags)
 930 {
 931         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 932         struct inode *old_inode = d_inode(old_dentry);
 933         struct inode *new_inode = d_inode(new_dentry);
 934         struct inode *whiteout = NULL;
 935         struct page *old_dir_page = NULL;
 936         struct page *old_page, *new_page = NULL;
 937         struct f2fs_dir_entry *old_dir_entry = NULL;
 938         struct f2fs_dir_entry *old_entry;
 939         struct f2fs_dir_entry *new_entry;
 940         int err;
 941
 942         if (unlikely(f2fs_cp_error(sbi)))
 943                 return -EIO;
 944         if (!f2fs_is_checkpoint_ready(sbi))
 945                 return -ENOSPC;
 946
 947         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 948                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 949                         F2FS_I(old_dentry->d_inode)->i_projid)))
 950                 return -EXDEV;
 951
 952         /*
 953          * If new_inode is null, the below renaming flow will
 954          * add a link in old_dir which can conver inline_dir.
 955          * After then, if we failed to get the entry due to other
 956          * reasons like ENOMEM, we had to remove the new entry.
 957          * Instead of adding such the error handling routine, let's
 958          * simply convert first here.
 959          */
 960         if (old_dir == new_dir && !new_inode) {
 961                 err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
 962                 if (err)
 963                         return err;
 964         }
 965
 966         if (flags & RENAME_WHITEOUT) {
 967                 err = f2fs_create_whiteout(mnt_userns, old_dir, &whiteout);
 968                 if (err)
 969                         return err;
 970         }
 971
 972         err = f2fs_dquot_initialize(old_dir);
 973         if (err)
 974                 goto out;
 975
 976         err = f2fs_dquot_initialize(new_dir);
 977         if (err)
 978                 goto out;
 979
 980         if (new_inode) {
 981                 err = f2fs_dquot_initialize(new_inode);
 982                 if (err)
 983                         goto out;
 984         }
 985
 986         err = -ENOENT;
 987         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 988         if (!old_entry) {
 989                 if (IS_ERR(old_page))
 990                         err = PTR_ERR(old_page);
 991                 goto out;
 992         }
 993
 994         if (S_ISDIR(old_inode->i_mode)) {
 995                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 996                 if (!old_dir_entry) {
 997                         if (IS_ERR(old_dir_page))
 998                                 err = PTR_ERR(old_dir_page);
 999                         goto out_old;
1000                 }
1001         }
1002
1003         if (new_inode) {
1004
1005                 err = -ENOTEMPTY;
1006                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
1007                         goto out_dir;
1008
1009                 err = -ENOENT;
1010                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
1011                                                 &new_page);
1012                 if (!new_entry) {
1013                         if (IS_ERR(new_page))
1014                                 err = PTR_ERR(new_page);
1015                         goto out_dir;
1016                 }
1017
1018                 f2fs_balance_fs(sbi, true);
1019
1020                 f2fs_lock_op(sbi);
1021
1022                 err = f2fs_acquire_orphan_inode(sbi);
1023                 if (err)
1024                         goto put_out_dir;
1025
1026                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1027                 new_page = NULL;
1028
1029                 new_inode->i_ctime = current_time(new_inode);
1030                 f2fs_down_write(&F2FS_I(new_inode)->i_sem);
1031                 if (old_dir_entry)
1032                         f2fs_i_links_write(new_inode, false);
1033                 f2fs_i_links_write(new_inode, false);
1034                 f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1035
1036                 if (!new_inode->i_nlink)
1037                         f2fs_add_orphan_inode(new_inode);
1038                 else
1039                         f2fs_release_orphan_inode(sbi);
1040         } else {
1041                 f2fs_balance_fs(sbi, true);
1042
1043                 f2fs_lock_op(sbi);
1044
1045                 err = f2fs_add_link(new_dentry, old_inode);
1046                 if (err) {
1047                         f2fs_unlock_op(sbi);
1048                         goto out_dir;
1049                 }
1050
1051                 if (old_dir_entry)
1052                         f2fs_i_links_write(new_dir, true);
1053         }
1054
1055         f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1056         if (!old_dir_entry || whiteout)
1057                 file_lost_pino(old_inode);
1058         else
1059                 /* adjust dir's i_pino to pass fsck check */
1060                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1061         f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1062
1063         old_inode->i_ctime = current_time(old_inode);
1064         f2fs_mark_inode_dirty_sync(old_inode, false);
1065
1066         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1067         old_page = NULL;
1068
1069         if (whiteout) {
1070                 set_inode_flag(whiteout, FI_INC_LINK);
1071                 err = f2fs_add_link(old_dentry, whiteout);
1072                 if (err)
1073                         goto put_out_dir;
1074
1075                 spin_lock(&whiteout->i_lock);
1076                 whiteout->i_state &= ~I_LINKABLE;
1077                 spin_unlock(&whiteout->i_lock);
1078
1079                 iput(whiteout);
1080         }
1081
1082         if (old_dir_entry) {
1083                 if (old_dir != new_dir && !whiteout)
1084                         f2fs_set_link(old_inode, old_dir_entry,
1085                                                 old_dir_page, new_dir);
1086                 else
1087                         f2fs_put_page(old_dir_page, 0);
1088                 f2fs_i_links_write(old_dir, false);
1089         }
1090         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1091                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1092                 if (S_ISDIR(old_inode->i_mode))
1093                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
1094                                                         TRANS_DIR_INO);
1095         }
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
1102         f2fs_update_time(sbi, REQ_TIME);
1103         return 0;
1104
1105 put_out_dir:
1106         f2fs_unlock_op(sbi);
1107         f2fs_put_page(new_page, 0);
1108 out_dir:
1109         if (old_dir_entry)
1110                 f2fs_put_page(old_dir_page, 0);
1111 out_old:
1112         f2fs_put_page(old_page, 0);
1113 out:
1114         iput(whiteout);
1115         return err;
1116 }
1117
1118 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1119                              struct inode *new_dir, struct dentry *new_dentry)
1120 {
1121         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1122         struct inode *old_inode = d_inode(old_dentry);
1123         struct inode *new_inode = d_inode(new_dentry);
1124         struct page *old_dir_page, *new_dir_page;
1125         struct page *old_page, *new_page;
1126         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1127         struct f2fs_dir_entry *old_entry, *new_entry;
1128         int old_nlink = 0, new_nlink = 0;
1129         int err;
1130
1131         if (unlikely(f2fs_cp_error(sbi)))
1132                 return -EIO;
1133         if (!f2fs_is_checkpoint_ready(sbi))
1134                 return -ENOSPC;
1135
1136         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1137                         !projid_eq(F2FS_I(new_dir)->i_projid,
1138                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1139             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1140                         !projid_eq(F2FS_I(old_dir)->i_projid,
1141                         F2FS_I(new_dentry->d_inode)->i_projid)))
1142                 return -EXDEV;
1143
1144         err = f2fs_dquot_initialize(old_dir);
1145         if (err)
1146                 goto out;
1147
1148         err = f2fs_dquot_initialize(new_dir);
1149         if (err)
1150                 goto out;
1151
1152         err = -ENOENT;
1153         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1154         if (!old_entry) {
1155                 if (IS_ERR(old_page))
1156                         err = PTR_ERR(old_page);
1157                 goto out;
1158         }
1159
1160         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1161         if (!new_entry) {
1162                 if (IS_ERR(new_page))
1163                         err = PTR_ERR(new_page);
1164                 goto out_old;
1165         }
1166
1167         /* prepare for updating ".." directory entry info later */
1168         if (old_dir != new_dir) {
1169                 if (S_ISDIR(old_inode->i_mode)) {
1170                         old_dir_entry = f2fs_parent_dir(old_inode,
1171                                                         &old_dir_page);
1172                         if (!old_dir_entry) {
1173                                 if (IS_ERR(old_dir_page))
1174                                         err = PTR_ERR(old_dir_page);
1175                                 goto out_new;
1176                         }
1177                 }
1178
1179                 if (S_ISDIR(new_inode->i_mode)) {
1180                         new_dir_entry = f2fs_parent_dir(new_inode,
1181                                                         &new_dir_page);
1182                         if (!new_dir_entry) {
1183                                 if (IS_ERR(new_dir_page))
1184                                         err = PTR_ERR(new_dir_page);
1185                                 goto out_old_dir;
1186                         }
1187                 }
1188         }
1189
1190         /*
1191          * If cross rename between file and directory those are not
1192          * in the same directory, we will inc nlink of file's parent
1193          * later, so we should check upper boundary of its nlink.
1194          */
1195         if ((!old_dir_entry || !new_dir_entry) &&
1196                                 old_dir_entry != new_dir_entry) {
1197                 old_nlink = old_dir_entry ? -1 : 1;
1198                 new_nlink = -old_nlink;
1199                 err = -EMLINK;
1200                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1201                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1202                         goto out_new_dir;
1203         }
1204
1205         f2fs_balance_fs(sbi, true);
1206
1207         f2fs_lock_op(sbi);
1208
1209         /* update ".." directory entry info of old dentry */
1210         if (old_dir_entry)
1211                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1212
1213         /* update ".." directory entry info of new dentry */
1214         if (new_dir_entry)
1215                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1216
1217         /* update directory entry info of old dir inode */
1218         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1219
1220         f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1221         if (!old_dir_entry)
1222                 file_lost_pino(old_inode);
1223         else
1224                 /* adjust dir's i_pino to pass fsck check */
1225                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1226         f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1227
1228         old_dir->i_ctime = current_time(old_dir);
1229         if (old_nlink) {
1230                 f2fs_down_write(&F2FS_I(old_dir)->i_sem);
1231                 f2fs_i_links_write(old_dir, old_nlink > 0);
1232                 f2fs_up_write(&F2FS_I(old_dir)->i_sem);
1233         }
1234         f2fs_mark_inode_dirty_sync(old_dir, false);
1235
1236         /* update directory entry info of new dir inode */
1237         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1238
1239         f2fs_down_write(&F2FS_I(new_inode)->i_sem);
1240         if (!new_dir_entry)
1241                 file_lost_pino(new_inode);
1242         else
1243                 /* adjust dir's i_pino to pass fsck check */
1244                 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1245         f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1246
1247         new_dir->i_ctime = current_time(new_dir);
1248         if (new_nlink) {
1249                 f2fs_down_write(&F2FS_I(new_dir)->i_sem);
1250                 f2fs_i_links_write(new_dir, new_nlink > 0);
1251                 f2fs_up_write(&F2FS_I(new_dir)->i_sem);
1252         }
1253         f2fs_mark_inode_dirty_sync(new_dir, false);
1254
1255         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1256                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1257                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1258         }
1259
1260         f2fs_unlock_op(sbi);
1261
1262         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1263                 f2fs_sync_fs(sbi->sb, 1);
1264
1265         f2fs_update_time(sbi, REQ_TIME);
1266         return 0;
1267 out_new_dir:
1268         if (new_dir_entry) {
1269                 f2fs_put_page(new_dir_page, 0);
1270         }
1271 out_old_dir:
1272         if (old_dir_entry) {
1273                 f2fs_put_page(old_dir_page, 0);
1274         }
1275 out_new:
1276         f2fs_put_page(new_page, 0);
1277 out_old:
1278         f2fs_put_page(old_page, 0);
1279 out:
1280         return err;
1281 }
1282
1283 static int f2fs_rename2(struct user_namespace *mnt_userns,
1284                         struct inode *old_dir, struct dentry *old_dentry,
1285                         struct inode *new_dir, struct dentry *new_dentry,
1286                         unsigned int flags)
1287 {
1288         int err;
1289
1290         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1291                 return -EINVAL;
1292
1293         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1294                                      flags);
1295         if (err)
1296                 return err;
1297
1298         if (flags & RENAME_EXCHANGE) {
1299                 return f2fs_cross_rename(old_dir, old_dentry,
1300                                          new_dir, new_dentry);
1301         }
1302         /*
1303          * VFS has already handled the new dentry existence case,
1304          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1305          */
1306         return f2fs_rename(mnt_userns, old_dir, old_dentry,
1307                                         new_dir, new_dentry, flags);
1308 }
1309
1310 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1311                                            struct inode *inode,
1312                                            struct delayed_call *done)
1313 {
1314         struct page *page;
1315         const char *target;
1316
1317         if (!dentry)
1318                 return ERR_PTR(-ECHILD);
1319
1320         page = read_mapping_page(inode->i_mapping, 0, NULL);
1321         if (IS_ERR(page))
1322                 return ERR_CAST(page);
1323
1324         target = fscrypt_get_symlink(inode, page_address(page),
1325                                      inode->i_sb->s_blocksize, done);
1326         put_page(page);
1327         return target;
1328 }
1329
1330 static int f2fs_encrypted_symlink_getattr(struct user_namespace *mnt_userns,
1331                                           const struct path *path,
1332                                           struct kstat *stat, u32 request_mask,
1333                                           unsigned int query_flags)
1334 {
1335         f2fs_getattr(mnt_userns, path, stat, request_mask, query_flags);
1336
1337         return fscrypt_symlink_getattr(path, stat);
1338 }
1339
1340 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1341         .get_link       = f2fs_encrypted_get_link,
1342         .getattr        = f2fs_encrypted_symlink_getattr,
1343         .setattr        = f2fs_setattr,
1344         .listxattr      = f2fs_listxattr,
1345 };
1346
1347 const struct inode_operations f2fs_dir_inode_operations = {
1348         .create         = f2fs_create,
1349         .lookup         = f2fs_lookup,
1350         .link           = f2fs_link,
1351         .unlink         = f2fs_unlink,
1352         .symlink        = f2fs_symlink,
1353         .mkdir          = f2fs_mkdir,
1354         .rmdir          = f2fs_rmdir,
1355         .mknod          = f2fs_mknod,
1356         .rename         = f2fs_rename2,
1357         .tmpfile        = f2fs_tmpfile,
1358         .getattr        = f2fs_getattr,
1359         .setattr        = f2fs_setattr,
1360         .get_acl        = f2fs_get_acl,
1361         .set_acl        = f2fs_set_acl,
1362         .listxattr      = f2fs_listxattr,
1363         .fiemap         = f2fs_fiemap,
1364         .fileattr_get   = f2fs_fileattr_get,
1365         .fileattr_set   = f2fs_fileattr_set,
1366 };
1367
1368 const struct inode_operations f2fs_symlink_inode_operations = {
1369         .get_link       = f2fs_get_link,
1370         .getattr        = f2fs_getattr,
1371         .setattr        = f2fs_setattr,
1372         .listxattr      = f2fs_listxattr,
1373 };
1374
1375 const struct inode_operations f2fs_special_inode_operations = {
1376         .getattr        = f2fs_getattr,
1377         .setattr        = f2fs_setattr,
1378         .get_acl        = f2fs_get_acl,
1379         .set_acl        = f2fs_set_acl,
1380         .listxattr      = f2fs_listxattr,
1381 };