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 inline int is_extension_exist(const unsigned char *s, const char *sub,
  26                                                 bool tmp_ext)
  27 {
  28         size_t slen = strlen(s);
  29         size_t sublen = strlen(sub);
  30         int i;
  31
  32         if (sublen == 1 && *sub == '*')
  33                 return 1;
  34
  35         /*
  36          * filename format of multimedia file should be defined as:
  37          * "filename + '.' + extension + (optional: '.' + temp extension)".
  38          */
  39         if (slen < sublen + 2)
  40                 return 0;
  41
  42         if (!tmp_ext) {
  43                 /* file has no temp extension */
  44                 if (s[slen - sublen - 1] != '.')
  45                         return 0;
  46                 return !strncasecmp(s + slen - sublen, sub, sublen);
  47         }
  48
  49         for (i = 1; i < slen - sublen; i++) {
  50                 if (s[i] != '.')
  51                         continue;
  52                 if (!strncasecmp(s + i + 1, sub, sublen))
  53                         return 1;
  54         }
  55
  56         return 0;
  57 }
  58
  59 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
  60                                                         bool hot, bool set)
  61 {
  62         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
  63         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
  64         int hot_count = sbi->raw_super->hot_ext_count;
  65         int total_count = cold_count + hot_count;
  66         int start, count;
  67         int i;
  68
  69         if (set) {
  70                 if (total_count == F2FS_MAX_EXTENSION)
  71                         return -EINVAL;
  72         } else {
  73                 if (!hot && !cold_count)
  74                         return -EINVAL;
  75                 if (hot && !hot_count)
  76                         return -EINVAL;
  77         }
  78
  79         if (hot) {
  80                 start = cold_count;
  81                 count = total_count;
  82         } else {
  83                 start = 0;
  84                 count = cold_count;
  85         }
  86
  87         for (i = start; i < count; i++) {
  88                 if (strcmp(name, extlist[i]))
  89                         continue;
  90
  91                 if (set)
  92                         return -EINVAL;
  93
  94                 memcpy(extlist[i], extlist[i + 1],
  95                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
  96                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
  97                 if (hot)
  98                         sbi->raw_super->hot_ext_count = hot_count - 1;
  99                 else
 100                         sbi->raw_super->extension_count =
 101                                                 cpu_to_le32(cold_count - 1);
 102                 return 0;
 103         }
 104
 105         if (!set)
 106                 return -EINVAL;
 107
 108         if (hot) {
 109                 memcpy(extlist[count], name, strlen(name));
 110                 sbi->raw_super->hot_ext_count = hot_count + 1;
 111         } else {
 112                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 113
 114                 memcpy(buf, &extlist[cold_count],
 115                                 F2FS_EXTENSION_LEN * hot_count);
 116                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 117                 memcpy(extlist[cold_count], name, strlen(name));
 118                 memcpy(&extlist[cold_count + 1], buf,
 119                                 F2FS_EXTENSION_LEN * hot_count);
 120                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 121         }
 122         return 0;
 123 }
 124
 125 static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
 126                                 struct inode *inode, const unsigned char *name)
 127 {
 128         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 129         unsigned char (*noext)[F2FS_EXTENSION_LEN] =
 130                                                 F2FS_OPTION(sbi).noextensions;
 131         unsigned char (*ext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).extensions;
 132         unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
 133         unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
 134         int i, cold_count, hot_count;
 135
 136         if (!f2fs_sb_has_compression(sbi))
 137                 return;
 138
 139         if (S_ISDIR(inode->i_mode))
 140                 goto inherit_comp;
 141
 142         /* This name comes only from normal files. */
 143         if (!name)
 144                 return;
 145
 146         /* Don't compress hot files. */
 147         f2fs_down_read(&sbi->sb_lock);
 148         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 149         hot_count = sbi->raw_super->hot_ext_count;
 150         for (i = cold_count; i < cold_count + hot_count; i++)
 151                 if (is_extension_exist(name, extlist[i], false))
 152                         break;
 153         f2fs_up_read(&sbi->sb_lock);
 154         if (i < (cold_count + hot_count))
 155                 return;
 156
 157         /* Don't compress unallowed extension. */
 158         for (i = 0; i < noext_cnt; i++)
 159                 if (is_extension_exist(name, noext[i], false))
 160                         return;
 161
 162         /* Compress wanting extension. */
 163         for (i = 0; i < ext_cnt; i++) {
 164                 if (is_extension_exist(name, ext[i], false)) {
 165                         set_compress_context(inode);
 166                         return;
 167                 }
 168         }
 169 inherit_comp:
 170         /* Inherit the {no-}compression flag in directory */
 171         if (F2FS_I(dir)->i_flags & F2FS_NOCOMP_FL) {
 172                 F2FS_I(inode)->i_flags |= F2FS_NOCOMP_FL;
 173                 f2fs_mark_inode_dirty_sync(inode, true);
 174         } else if (F2FS_I(dir)->i_flags & F2FS_COMPR_FL) {
 175                 set_compress_context(inode);
 176         }
 177 }
 178
 179 static struct inode *f2fs_new_inode(struct user_namespace *mnt_userns,
 180                                                 struct inode *dir, umode_t mode,
 181                                                 const char *name)
 182 {
 183         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 184         nid_t ino;
 185         struct inode *inode;
 186         bool nid_free = false;
 187         bool encrypt = false;
 188         int xattr_size = 0;
 189         int err;
 190
 191         inode = new_inode(dir->i_sb);
 192         if (!inode)
 193                 return ERR_PTR(-ENOMEM);
 194
 195         if (!f2fs_alloc_nid(sbi, &ino)) {
 196                 err = -ENOSPC;
 197                 goto fail;
 198         }
 199
 200         nid_free = true;
 201
 202         inode_init_owner(mnt_userns, inode, dir, mode);
 203
 204         inode->i_ino = ino;
 205         inode->i_blocks = 0;
 206         inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
 207         F2FS_I(inode)->i_crtime = inode->i_mtime;
 208         inode->i_generation = get_random_u32();
 209
 210         if (S_ISDIR(inode->i_mode))
 211                 F2FS_I(inode)->i_current_depth = 1;
 212
 213         err = insert_inode_locked(inode);
 214         if (err) {
 215                 err = -EINVAL;
 216                 goto fail;
 217         }
 218
 219         if (f2fs_sb_has_project_quota(sbi) &&
 220                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
 221                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
 222         else
 223                 F2FS_I(inode)->i_projid = make_kprojid(mnt_userns,
 224                                                         F2FS_DEF_PROJID);
 225
 226         err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
 227         if (err)
 228                 goto fail_drop;
 229
 230         err = f2fs_dquot_initialize(inode);
 231         if (err)
 232                 goto fail_drop;
 233
 234         set_inode_flag(inode, FI_NEW_INODE);
 235
 236         if (encrypt)
 237                 f2fs_set_encrypted_inode(inode);
 238
 239         if (f2fs_sb_has_extra_attr(sbi)) {
 240                 set_inode_flag(inode, FI_EXTRA_ATTR);
 241                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
 242         }
 243
 244         if (test_opt(sbi, INLINE_XATTR))
 245                 set_inode_flag(inode, FI_INLINE_XATTR);
 246
 247         if (f2fs_may_inline_dentry(inode))
 248                 set_inode_flag(inode, FI_INLINE_DENTRY);
 249
 250         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
 251                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
 252                 if (f2fs_has_inline_xattr(inode))
 253                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
 254                 /* Otherwise, will be 0 */
 255         } else if (f2fs_has_inline_xattr(inode) ||
 256                                 f2fs_has_inline_dentry(inode)) {
 257                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 258         }
 259         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 260
 261         F2FS_I(inode)->i_flags =
 262                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 263
 264         if (S_ISDIR(inode->i_mode))
 265                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 266
 267         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 268                 set_inode_flag(inode, FI_PROJ_INHERIT);
 269
 270         /* Check compression first. */
 271         set_compress_new_inode(sbi, dir, inode, name);
 272
 273         /* Should enable inline_data after compression set */
 274         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
 275                 set_inode_flag(inode, FI_INLINE_DATA);
 276
 277         stat_inc_inline_xattr(inode);
 278         stat_inc_inline_inode(inode);
 279         stat_inc_inline_dir(inode);
 280
 281         f2fs_set_inode_flags(inode);
 282
 283         f2fs_init_extent_tree(inode);
 284
 285         trace_f2fs_new_inode(inode, 0);
 286         return inode;
 287
 288 fail:
 289         trace_f2fs_new_inode(inode, err);
 290         make_bad_inode(inode);
 291         if (nid_free)
 292                 set_inode_flag(inode, FI_FREE_NID);
 293         iput(inode);
 294         return ERR_PTR(err);
 295 fail_drop:
 296         trace_f2fs_new_inode(inode, err);
 297         dquot_drop(inode);
 298         inode->i_flags |= S_NOQUOTA;
 299         if (nid_free)
 300                 set_inode_flag(inode, FI_FREE_NID);
 301         clear_nlink(inode);
 302         unlock_new_inode(inode);
 303         iput(inode);
 304         return ERR_PTR(err);
 305 }
 306
 307 /*
 308  * Set file's temperature for hot/cold data separation
 309  */
 310 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 311                 const unsigned char *name)
 312 {
 313         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 314         int i, cold_count, hot_count;
 315
 316         f2fs_down_read(&sbi->sb_lock);
 317
 318         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 319         hot_count = sbi->raw_super->hot_ext_count;
 320
 321         for (i = 0; i < cold_count + hot_count; i++) {
 322                 if (is_extension_exist(name, extlist[i], true))
 323                         break;
 324         }
 325
 326         f2fs_up_read(&sbi->sb_lock);
 327
 328         if (i == cold_count + hot_count)
 329                 return;
 330
 331         if (i < cold_count)
 332                 file_set_cold(inode);
 333         else
 334                 file_set_hot(inode);
 335 }
 336
 337 static int f2fs_create(struct user_namespace *mnt_userns, struct inode *dir,
 338                        struct dentry *dentry, umode_t mode, bool excl)
 339 {
 340         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 341         struct inode *inode;
 342         nid_t ino = 0;
 343         int err;
 344
 345         if (unlikely(f2fs_cp_error(sbi)))
 346                 return -EIO;
 347         if (!f2fs_is_checkpoint_ready(sbi))
 348                 return -ENOSPC;
 349
 350         err = f2fs_dquot_initialize(dir);
 351         if (err)
 352                 return err;
 353
 354         inode = f2fs_new_inode(mnt_userns, dir, mode, dentry->d_name.name);
 355         if (IS_ERR(inode))
 356                 return PTR_ERR(inode);
 357
 358         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 359                 set_file_temperature(sbi, inode, dentry->d_name.name);
 360
 361         inode->i_op = &f2fs_file_inode_operations;
 362         inode->i_fop = &f2fs_file_operations;
 363         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 364         ino = inode->i_ino;
 365
 366         f2fs_lock_op(sbi);
 367         err = f2fs_add_link(dentry, inode);
 368         if (err)
 369                 goto out;
 370         f2fs_unlock_op(sbi);
 371
 372         f2fs_alloc_nid_done(sbi, ino);
 373
 374         d_instantiate_new(dentry, inode);
 375
 376         if (IS_DIRSYNC(dir))
 377                 f2fs_sync_fs(sbi->sb, 1);
 378
 379         f2fs_balance_fs(sbi, true);
 380         return 0;
 381 out:
 382         f2fs_handle_failed_inode(inode);
 383         return err;
 384 }
 385
 386 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 387                 struct dentry *dentry)
 388 {
 389         struct inode *inode = d_inode(old_dentry);
 390         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 391         int err;
 392
 393         if (unlikely(f2fs_cp_error(sbi)))
 394                 return -EIO;
 395         if (!f2fs_is_checkpoint_ready(sbi))
 396                 return -ENOSPC;
 397
 398         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 399         if (err)
 400                 return err;
 401
 402         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 403                         (!projid_eq(F2FS_I(dir)->i_projid,
 404                         F2FS_I(old_dentry->d_inode)->i_projid)))
 405                 return -EXDEV;
 406
 407         err = f2fs_dquot_initialize(dir);
 408         if (err)
 409                 return err;
 410
 411         f2fs_balance_fs(sbi, true);
 412
 413         inode->i_ctime = current_time(inode);
 414         ihold(inode);
 415
 416         set_inode_flag(inode, FI_INC_LINK);
 417         f2fs_lock_op(sbi);
 418         err = f2fs_add_link(dentry, inode);
 419         if (err)
 420                 goto out;
 421         f2fs_unlock_op(sbi);
 422
 423         d_instantiate(dentry, inode);
 424
 425         if (IS_DIRSYNC(dir))
 426                 f2fs_sync_fs(sbi->sb, 1);
 427         return 0;
 428 out:
 429         clear_inode_flag(inode, FI_INC_LINK);
 430         iput(inode);
 431         f2fs_unlock_op(sbi);
 432         return err;
 433 }
 434
 435 struct dentry *f2fs_get_parent(struct dentry *child)
 436 {
 437         struct page *page;
 438         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot_name, &page);
 439
 440         if (!ino) {
 441                 if (IS_ERR(page))
 442                         return ERR_CAST(page);
 443                 return ERR_PTR(-ENOENT);
 444         }
 445         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 446 }
 447
 448 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 449 {
 450         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 451         struct qstr dot = QSTR_INIT(".", 1);
 452         struct qstr dotdot = QSTR_INIT("..", 2);
 453         struct f2fs_dir_entry *de;
 454         struct page *page;
 455         int err = 0;
 456
 457         if (f2fs_readonly(sbi->sb)) {
 458                 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
 459                           dir->i_ino, pino);
 460                 return 0;
 461         }
 462
 463         if (!S_ISDIR(dir->i_mode)) {
 464                 f2fs_err(sbi, "inconsistent inode status, skip recovering inline_dots inode (ino:%lu, i_mode:%u, pino:%u)",
 465                           dir->i_ino, dir->i_mode, pino);
 466                 set_sbi_flag(sbi, SBI_NEED_FSCK);
 467                 return -ENOTDIR;
 468         }
 469
 470         err = f2fs_dquot_initialize(dir);
 471         if (err)
 472                 return err;
 473
 474         f2fs_balance_fs(sbi, true);
 475
 476         f2fs_lock_op(sbi);
 477
 478         de = f2fs_find_entry(dir, &dot, &page);
 479         if (de) {
 480                 f2fs_put_page(page, 0);
 481         } else if (IS_ERR(page)) {
 482                 err = PTR_ERR(page);
 483                 goto out;
 484         } else {
 485                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 486                 if (err)
 487                         goto out;
 488         }
 489
 490         de = f2fs_find_entry(dir, &dotdot, &page);
 491         if (de)
 492                 f2fs_put_page(page, 0);
 493         else if (IS_ERR(page))
 494                 err = PTR_ERR(page);
 495         else
 496                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 497 out:
 498         if (!err)
 499                 clear_inode_flag(dir, FI_INLINE_DOTS);
 500
 501         f2fs_unlock_op(sbi);
 502         return err;
 503 }
 504
 505 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 506                 unsigned int flags)
 507 {
 508         struct inode *inode = NULL;
 509         struct f2fs_dir_entry *de;
 510         struct page *page;
 511         struct dentry *new;
 512         nid_t ino = -1;
 513         int err = 0;
 514         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 515         struct f2fs_filename fname;
 516
 517         trace_f2fs_lookup_start(dir, dentry, flags);
 518
 519         if (dentry->d_name.len > F2FS_NAME_LEN) {
 520                 err = -ENAMETOOLONG;
 521                 goto out;
 522         }
 523
 524         err = f2fs_prepare_lookup(dir, dentry, &fname);
 525         generic_set_encrypted_ci_d_ops(dentry);
 526         if (err == -ENOENT)
 527                 goto out_splice;
 528         if (err)
 529                 goto out;
 530         de = __f2fs_find_entry(dir, &fname, &page);
 531         f2fs_free_filename(&fname);
 532
 533         if (!de) {
 534                 if (IS_ERR(page)) {
 535                         err = PTR_ERR(page);
 536                         goto out;
 537                 }
 538                 err = -ENOENT;
 539                 goto out_splice;
 540         }
 541
 542         ino = le32_to_cpu(de->ino);
 543         f2fs_put_page(page, 0);
 544
 545         inode = f2fs_iget(dir->i_sb, ino);
 546         if (IS_ERR(inode)) {
 547                 err = PTR_ERR(inode);
 548                 goto out;
 549         }
 550
 551         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 552                 err = __recover_dot_dentries(dir, root_ino);
 553                 if (err)
 554                         goto out_iput;
 555         }
 556
 557         if (f2fs_has_inline_dots(inode)) {
 558                 err = __recover_dot_dentries(inode, dir->i_ino);
 559                 if (err)
 560                         goto out_iput;
 561         }
 562         if (IS_ENCRYPTED(dir) &&
 563             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 564             !fscrypt_has_permitted_context(dir, inode)) {
 565                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
 566                           dir->i_ino, inode->i_ino);
 567                 err = -EPERM;
 568                 goto out_iput;
 569         }
 570 out_splice:
 571 #if IS_ENABLED(CONFIG_UNICODE)
 572         if (!inode && IS_CASEFOLDED(dir)) {
 573                 /* Eventually we want to call d_add_ci(dentry, NULL)
 574                  * for negative dentries in the encoding case as
 575                  * well.  For now, prevent the negative dentry
 576                  * from being cached.
 577                  */
 578                 trace_f2fs_lookup_end(dir, dentry, ino, err);
 579                 return NULL;
 580         }
 581 #endif
 582         new = d_splice_alias(inode, dentry);
 583         err = PTR_ERR_OR_ZERO(new);
 584         trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err);
 585         return new;
 586 out_iput:
 587         iput(inode);
 588 out:
 589         trace_f2fs_lookup_end(dir, dentry, ino, err);
 590         return ERR_PTR(err);
 591 }
 592
 593 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 594 {
 595         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 596         struct inode *inode = d_inode(dentry);
 597         struct f2fs_dir_entry *de;
 598         struct page *page;
 599         int err;
 600
 601         trace_f2fs_unlink_enter(dir, dentry);
 602
 603         if (unlikely(f2fs_cp_error(sbi))) {
 604                 err = -EIO;
 605                 goto fail;
 606         }
 607
 608         err = f2fs_dquot_initialize(dir);
 609         if (err)
 610                 goto fail;
 611         err = f2fs_dquot_initialize(inode);
 612         if (err)
 613                 goto fail;
 614
 615         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 616         if (!de) {
 617                 if (IS_ERR(page))
 618                         err = PTR_ERR(page);
 619                 goto fail;
 620         }
 621
 622         f2fs_balance_fs(sbi, true);
 623
 624         f2fs_lock_op(sbi);
 625         err = f2fs_acquire_orphan_inode(sbi);
 626         if (err) {
 627                 f2fs_unlock_op(sbi);
 628                 f2fs_put_page(page, 0);
 629                 goto fail;
 630         }
 631         f2fs_delete_entry(de, page, dir, inode);
 632 #if IS_ENABLED(CONFIG_UNICODE)
 633         /* VFS negative dentries are incompatible with Encoding and
 634          * Case-insensitiveness. Eventually we'll want avoid
 635          * invalidating the dentries here, alongside with returning the
 636          * negative dentries at f2fs_lookup(), when it is better
 637          * supported by the VFS for the CI case.
 638          */
 639         if (IS_CASEFOLDED(dir))
 640                 d_invalidate(dentry);
 641 #endif
 642         f2fs_unlock_op(sbi);
 643
 644         if (IS_DIRSYNC(dir))
 645                 f2fs_sync_fs(sbi->sb, 1);
 646 fail:
 647         trace_f2fs_unlink_exit(inode, err);
 648         return err;
 649 }
 650
 651 static const char *f2fs_get_link(struct dentry *dentry,
 652                                  struct inode *inode,
 653                                  struct delayed_call *done)
 654 {
 655         const char *link = page_get_link(dentry, inode, done);
 656
 657         if (!IS_ERR(link) && !*link) {
 658                 /* this is broken symlink case */
 659                 do_delayed_call(done);
 660                 clear_delayed_call(done);
 661                 link = ERR_PTR(-ENOENT);
 662         }
 663         return link;
 664 }
 665
 666 static int f2fs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
 667                         struct dentry *dentry, const char *symname)
 668 {
 669         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 670         struct inode *inode;
 671         size_t len = strlen(symname);
 672         struct fscrypt_str disk_link;
 673         int err;
 674
 675         if (unlikely(f2fs_cp_error(sbi)))
 676                 return -EIO;
 677         if (!f2fs_is_checkpoint_ready(sbi))
 678                 return -ENOSPC;
 679
 680         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 681                                       &disk_link);
 682         if (err)
 683                 return err;
 684
 685         err = f2fs_dquot_initialize(dir);
 686         if (err)
 687                 return err;
 688
 689         inode = f2fs_new_inode(mnt_userns, dir, S_IFLNK | S_IRWXUGO, NULL);
 690         if (IS_ERR(inode))
 691                 return PTR_ERR(inode);
 692
 693         if (IS_ENCRYPTED(inode))
 694                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 695         else
 696                 inode->i_op = &f2fs_symlink_inode_operations;
 697         inode_nohighmem(inode);
 698         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 699
 700         f2fs_lock_op(sbi);
 701         err = f2fs_add_link(dentry, inode);
 702         if (err)
 703                 goto out_f2fs_handle_failed_inode;
 704         f2fs_unlock_op(sbi);
 705         f2fs_alloc_nid_done(sbi, inode->i_ino);
 706
 707         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 708         if (err)
 709                 goto err_out;
 710
 711         err = page_symlink(inode, disk_link.name, disk_link.len);
 712
 713 err_out:
 714         d_instantiate_new(dentry, inode);
 715
 716         /*
 717          * Let's flush symlink data in order to avoid broken symlink as much as
 718          * possible. Nevertheless, fsyncing is the best way, but there is no
 719          * way to get a file descriptor in order to flush that.
 720          *
 721          * Note that, it needs to do dir->fsync to make this recoverable.
 722          * If the symlink path is stored into inline_data, there is no
 723          * performance regression.
 724          */
 725         if (!err) {
 726                 filemap_write_and_wait_range(inode->i_mapping, 0,
 727                                                         disk_link.len - 1);
 728
 729                 if (IS_DIRSYNC(dir))
 730                         f2fs_sync_fs(sbi->sb, 1);
 731         } else {
 732                 f2fs_unlink(dir, dentry);
 733         }
 734
 735         f2fs_balance_fs(sbi, true);
 736         goto out_free_encrypted_link;
 737
 738 out_f2fs_handle_failed_inode:
 739         f2fs_handle_failed_inode(inode);
 740 out_free_encrypted_link:
 741         if (disk_link.name != (unsigned char *)symname)
 742                 kfree(disk_link.name);
 743         return err;
 744 }
 745
 746 static int f2fs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 747                       struct dentry *dentry, umode_t mode)
 748 {
 749         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 750         struct inode *inode;
 751         int err;
 752
 753         if (unlikely(f2fs_cp_error(sbi)))
 754                 return -EIO;
 755
 756         err = f2fs_dquot_initialize(dir);
 757         if (err)
 758                 return err;
 759
 760         inode = f2fs_new_inode(mnt_userns, dir, S_IFDIR | mode, NULL);
 761         if (IS_ERR(inode))
 762                 return PTR_ERR(inode);
 763
 764         inode->i_op = &f2fs_dir_inode_operations;
 765         inode->i_fop = &f2fs_dir_operations;
 766         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 767         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 768
 769         set_inode_flag(inode, FI_INC_LINK);
 770         f2fs_lock_op(sbi);
 771         err = f2fs_add_link(dentry, inode);
 772         if (err)
 773                 goto out_fail;
 774         f2fs_unlock_op(sbi);
 775
 776         f2fs_alloc_nid_done(sbi, inode->i_ino);
 777
 778         d_instantiate_new(dentry, inode);
 779
 780         if (IS_DIRSYNC(dir))
 781                 f2fs_sync_fs(sbi->sb, 1);
 782
 783         f2fs_balance_fs(sbi, true);
 784         return 0;
 785
 786 out_fail:
 787         clear_inode_flag(inode, FI_INC_LINK);
 788         f2fs_handle_failed_inode(inode);
 789         return err;
 790 }
 791
 792 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 793 {
 794         struct inode *inode = d_inode(dentry);
 795
 796         if (f2fs_empty_dir(inode))
 797                 return f2fs_unlink(dir, dentry);
 798         return -ENOTEMPTY;
 799 }
 800
 801 static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
 802                       struct dentry *dentry, umode_t mode, dev_t rdev)
 803 {
 804         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 805         struct inode *inode;
 806         int err = 0;
 807
 808         if (unlikely(f2fs_cp_error(sbi)))
 809                 return -EIO;
 810         if (!f2fs_is_checkpoint_ready(sbi))
 811                 return -ENOSPC;
 812
 813         err = f2fs_dquot_initialize(dir);
 814         if (err)
 815                 return err;
 816
 817         inode = f2fs_new_inode(mnt_userns, dir, mode, NULL);
 818         if (IS_ERR(inode))
 819                 return PTR_ERR(inode);
 820
 821         init_special_inode(inode, inode->i_mode, rdev);
 822         inode->i_op = &f2fs_special_inode_operations;
 823
 824         f2fs_lock_op(sbi);
 825         err = f2fs_add_link(dentry, inode);
 826         if (err)
 827                 goto out;
 828         f2fs_unlock_op(sbi);
 829
 830         f2fs_alloc_nid_done(sbi, inode->i_ino);
 831
 832         d_instantiate_new(dentry, inode);
 833
 834         if (IS_DIRSYNC(dir))
 835                 f2fs_sync_fs(sbi->sb, 1);
 836
 837         f2fs_balance_fs(sbi, true);
 838         return 0;
 839 out:
 840         f2fs_handle_failed_inode(inode);
 841         return err;
 842 }
 843
 844 static int __f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 845                           struct file *file, umode_t mode, bool is_whiteout,
 846                           struct inode **new_inode)
 847 {
 848         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 849         struct inode *inode;
 850         int err;
 851
 852         err = f2fs_dquot_initialize(dir);
 853         if (err)
 854                 return err;
 855
 856         inode = f2fs_new_inode(mnt_userns, dir, mode, NULL);
 857         if (IS_ERR(inode))
 858                 return PTR_ERR(inode);
 859
 860         if (is_whiteout) {
 861                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 862                 inode->i_op = &f2fs_special_inode_operations;
 863         } else {
 864                 inode->i_op = &f2fs_file_inode_operations;
 865                 inode->i_fop = &f2fs_file_operations;
 866                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 867         }
 868
 869         f2fs_lock_op(sbi);
 870         err = f2fs_acquire_orphan_inode(sbi);
 871         if (err)
 872                 goto out;
 873
 874         err = f2fs_do_tmpfile(inode, dir);
 875         if (err)
 876                 goto release_out;
 877
 878         /*
 879          * add this non-linked tmpfile to orphan list, in this way we could
 880          * remove all unused data of tmpfile after abnormal power-off.
 881          */
 882         f2fs_add_orphan_inode(inode);
 883         f2fs_alloc_nid_done(sbi, inode->i_ino);
 884
 885         if (is_whiteout) {
 886                 f2fs_i_links_write(inode, false);
 887
 888                 spin_lock(&inode->i_lock);
 889                 inode->i_state |= I_LINKABLE;
 890                 spin_unlock(&inode->i_lock);
 891         } else {
 892                 if (file)
 893                         d_tmpfile(file, inode);
 894                 else
 895                         f2fs_i_links_write(inode, false);
 896         }
 897         /* link_count was changed by d_tmpfile as well. */
 898         f2fs_unlock_op(sbi);
 899         unlock_new_inode(inode);
 900
 901         if (new_inode)
 902                 *new_inode = inode;
 903
 904         f2fs_balance_fs(sbi, true);
 905         return 0;
 906
 907 release_out:
 908         f2fs_release_orphan_inode(sbi);
 909 out:
 910         f2fs_handle_failed_inode(inode);
 911         return err;
 912 }
 913
 914 static int f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 915                         struct file *file, umode_t mode)
 916 {
 917         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 918         int err;
 919
 920         if (unlikely(f2fs_cp_error(sbi)))
 921                 return -EIO;
 922         if (!f2fs_is_checkpoint_ready(sbi))
 923                 return -ENOSPC;
 924
 925         err = __f2fs_tmpfile(mnt_userns, dir, file, mode, false, NULL);
 926
 927         return finish_open_simple(file, err);
 928 }
 929
 930 static int f2fs_create_whiteout(struct user_namespace *mnt_userns,
 931                                 struct inode *dir, struct inode **whiteout)
 932 {
 933         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 934                 return -EIO;
 935
 936         return __f2fs_tmpfile(mnt_userns, dir, NULL,
 937                                 S_IFCHR | WHITEOUT_MODE, true, whiteout);
 938 }
 939
 940 int f2fs_get_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 941                      struct inode **new_inode)
 942 {
 943         return __f2fs_tmpfile(mnt_userns, dir, NULL, S_IFREG, false, new_inode);
 944 }
 945
 946 static int f2fs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
 947                         struct dentry *old_dentry, struct inode *new_dir,
 948                         struct dentry *new_dentry, unsigned int flags)
 949 {
 950         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 951         struct inode *old_inode = d_inode(old_dentry);
 952         struct inode *new_inode = d_inode(new_dentry);
 953         struct inode *whiteout = NULL;
 954         struct page *old_dir_page = NULL;
 955         struct page *old_page, *new_page = NULL;
 956         struct f2fs_dir_entry *old_dir_entry = NULL;
 957         struct f2fs_dir_entry *old_entry;
 958         struct f2fs_dir_entry *new_entry;
 959         int err;
 960
 961         if (unlikely(f2fs_cp_error(sbi)))
 962                 return -EIO;
 963         if (!f2fs_is_checkpoint_ready(sbi))
 964                 return -ENOSPC;
 965
 966         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 967                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 968                         F2FS_I(old_dentry->d_inode)->i_projid)))
 969                 return -EXDEV;
 970
 971         /*
 972          * If new_inode is null, the below renaming flow will
 973          * add a link in old_dir which can conver inline_dir.
 974          * After then, if we failed to get the entry due to other
 975          * reasons like ENOMEM, we had to remove the new entry.
 976          * Instead of adding such the error handling routine, let's
 977          * simply convert first here.
 978          */
 979         if (old_dir == new_dir && !new_inode) {
 980                 err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
 981                 if (err)
 982                         return err;
 983         }
 984
 985         if (flags & RENAME_WHITEOUT) {
 986                 err = f2fs_create_whiteout(mnt_userns, old_dir, &whiteout);
 987                 if (err)
 988                         return err;
 989         }
 990
 991         err = f2fs_dquot_initialize(old_dir);
 992         if (err)
 993                 goto out;
 994
 995         err = f2fs_dquot_initialize(new_dir);
 996         if (err)
 997                 goto out;
 998
 999         if (new_inode) {
1000                 err = f2fs_dquot_initialize(new_inode);
1001                 if (err)
1002                         goto out;
1003         }
1004
1005         err = -ENOENT;
1006         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1007         if (!old_entry) {
1008                 if (IS_ERR(old_page))
1009                         err = PTR_ERR(old_page);
1010                 goto out;
1011         }
1012
1013         if (S_ISDIR(old_inode->i_mode)) {
1014                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
1015                 if (!old_dir_entry) {
1016                         if (IS_ERR(old_dir_page))
1017                                 err = PTR_ERR(old_dir_page);
1018                         goto out_old;
1019                 }
1020         }
1021
1022         if (new_inode) {
1023
1024                 err = -ENOTEMPTY;
1025                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
1026                         goto out_dir;
1027
1028                 err = -ENOENT;
1029                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
1030                                                 &new_page);
1031                 if (!new_entry) {
1032                         if (IS_ERR(new_page))
1033                                 err = PTR_ERR(new_page);
1034                         goto out_dir;
1035                 }
1036
1037                 f2fs_balance_fs(sbi, true);
1038
1039                 f2fs_lock_op(sbi);
1040
1041                 err = f2fs_acquire_orphan_inode(sbi);
1042                 if (err)
1043                         goto put_out_dir;
1044
1045                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1046                 new_page = NULL;
1047
1048                 new_inode->i_ctime = current_time(new_inode);
1049                 f2fs_down_write(&F2FS_I(new_inode)->i_sem);
1050                 if (old_dir_entry)
1051                         f2fs_i_links_write(new_inode, false);
1052                 f2fs_i_links_write(new_inode, false);
1053                 f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1054
1055                 if (!new_inode->i_nlink)
1056                         f2fs_add_orphan_inode(new_inode);
1057                 else
1058                         f2fs_release_orphan_inode(sbi);
1059         } else {
1060                 f2fs_balance_fs(sbi, true);
1061
1062                 f2fs_lock_op(sbi);
1063
1064                 err = f2fs_add_link(new_dentry, old_inode);
1065                 if (err) {
1066                         f2fs_unlock_op(sbi);
1067                         goto out_dir;
1068                 }
1069
1070                 if (old_dir_entry)
1071                         f2fs_i_links_write(new_dir, true);
1072         }
1073
1074         f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1075         if (!old_dir_entry || whiteout)
1076                 file_lost_pino(old_inode);
1077         else
1078                 /* adjust dir's i_pino to pass fsck check */
1079                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1080         f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1081
1082         old_inode->i_ctime = current_time(old_inode);
1083         f2fs_mark_inode_dirty_sync(old_inode, false);
1084
1085         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1086         old_page = NULL;
1087
1088         if (whiteout) {
1089                 set_inode_flag(whiteout, FI_INC_LINK);
1090                 err = f2fs_add_link(old_dentry, whiteout);
1091                 if (err)
1092                         goto put_out_dir;
1093
1094                 spin_lock(&whiteout->i_lock);
1095                 whiteout->i_state &= ~I_LINKABLE;
1096                 spin_unlock(&whiteout->i_lock);
1097
1098                 iput(whiteout);
1099         }
1100
1101         if (old_dir_entry) {
1102                 if (old_dir != new_dir)
1103                         f2fs_set_link(old_inode, old_dir_entry,
1104                                                 old_dir_page, new_dir);
1105                 else
1106                         f2fs_put_page(old_dir_page, 0);
1107                 f2fs_i_links_write(old_dir, false);
1108         }
1109         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1110                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1111                 if (S_ISDIR(old_inode->i_mode))
1112                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
1113                                                         TRANS_DIR_INO);
1114         }
1115
1116         f2fs_unlock_op(sbi);
1117
1118         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1119                 f2fs_sync_fs(sbi->sb, 1);
1120
1121         f2fs_update_time(sbi, REQ_TIME);
1122         return 0;
1123
1124 put_out_dir:
1125         f2fs_unlock_op(sbi);
1126         f2fs_put_page(new_page, 0);
1127 out_dir:
1128         if (old_dir_entry)
1129                 f2fs_put_page(old_dir_page, 0);
1130 out_old:
1131         f2fs_put_page(old_page, 0);
1132 out:
1133         iput(whiteout);
1134         return err;
1135 }
1136
1137 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1138                              struct inode *new_dir, struct dentry *new_dentry)
1139 {
1140         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1141         struct inode *old_inode = d_inode(old_dentry);
1142         struct inode *new_inode = d_inode(new_dentry);
1143         struct page *old_dir_page, *new_dir_page;
1144         struct page *old_page, *new_page;
1145         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1146         struct f2fs_dir_entry *old_entry, *new_entry;
1147         int old_nlink = 0, new_nlink = 0;
1148         int err;
1149
1150         if (unlikely(f2fs_cp_error(sbi)))
1151                 return -EIO;
1152         if (!f2fs_is_checkpoint_ready(sbi))
1153                 return -ENOSPC;
1154
1155         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1156                         !projid_eq(F2FS_I(new_dir)->i_projid,
1157                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1158             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1159                         !projid_eq(F2FS_I(old_dir)->i_projid,
1160                         F2FS_I(new_dentry->d_inode)->i_projid)))
1161                 return -EXDEV;
1162
1163         err = f2fs_dquot_initialize(old_dir);
1164         if (err)
1165                 goto out;
1166
1167         err = f2fs_dquot_initialize(new_dir);
1168         if (err)
1169                 goto out;
1170
1171         err = -ENOENT;
1172         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1173         if (!old_entry) {
1174                 if (IS_ERR(old_page))
1175                         err = PTR_ERR(old_page);
1176                 goto out;
1177         }
1178
1179         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1180         if (!new_entry) {
1181                 if (IS_ERR(new_page))
1182                         err = PTR_ERR(new_page);
1183                 goto out_old;
1184         }
1185
1186         /* prepare for updating ".." directory entry info later */
1187         if (old_dir != new_dir) {
1188                 if (S_ISDIR(old_inode->i_mode)) {
1189                         old_dir_entry = f2fs_parent_dir(old_inode,
1190                                                         &old_dir_page);
1191                         if (!old_dir_entry) {
1192                                 if (IS_ERR(old_dir_page))
1193                                         err = PTR_ERR(old_dir_page);
1194                                 goto out_new;
1195                         }
1196                 }
1197
1198                 if (S_ISDIR(new_inode->i_mode)) {
1199                         new_dir_entry = f2fs_parent_dir(new_inode,
1200                                                         &new_dir_page);
1201                         if (!new_dir_entry) {
1202                                 if (IS_ERR(new_dir_page))
1203                                         err = PTR_ERR(new_dir_page);
1204                                 goto out_old_dir;
1205                         }
1206                 }
1207         }
1208
1209         /*
1210          * If cross rename between file and directory those are not
1211          * in the same directory, we will inc nlink of file's parent
1212          * later, so we should check upper boundary of its nlink.
1213          */
1214         if ((!old_dir_entry || !new_dir_entry) &&
1215                                 old_dir_entry != new_dir_entry) {
1216                 old_nlink = old_dir_entry ? -1 : 1;
1217                 new_nlink = -old_nlink;
1218                 err = -EMLINK;
1219                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1220                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1221                         goto out_new_dir;
1222         }
1223
1224         f2fs_balance_fs(sbi, true);
1225
1226         f2fs_lock_op(sbi);
1227
1228         /* update ".." directory entry info of old dentry */
1229         if (old_dir_entry)
1230                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1231
1232         /* update ".." directory entry info of new dentry */
1233         if (new_dir_entry)
1234                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1235
1236         /* update directory entry info of old dir inode */
1237         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1238
1239         f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1240         if (!old_dir_entry)
1241                 file_lost_pino(old_inode);
1242         else
1243                 /* adjust dir's i_pino to pass fsck check */
1244                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1245         f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1246
1247         old_dir->i_ctime = current_time(old_dir);
1248         if (old_nlink) {
1249                 f2fs_down_write(&F2FS_I(old_dir)->i_sem);
1250                 f2fs_i_links_write(old_dir, old_nlink > 0);
1251                 f2fs_up_write(&F2FS_I(old_dir)->i_sem);
1252         }
1253         f2fs_mark_inode_dirty_sync(old_dir, false);
1254
1255         /* update directory entry info of new dir inode */
1256         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1257
1258         f2fs_down_write(&F2FS_I(new_inode)->i_sem);
1259         if (!new_dir_entry)
1260                 file_lost_pino(new_inode);
1261         else
1262                 /* adjust dir's i_pino to pass fsck check */
1263                 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1264         f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1265
1266         new_dir->i_ctime = current_time(new_dir);
1267         if (new_nlink) {
1268                 f2fs_down_write(&F2FS_I(new_dir)->i_sem);
1269                 f2fs_i_links_write(new_dir, new_nlink > 0);
1270                 f2fs_up_write(&F2FS_I(new_dir)->i_sem);
1271         }
1272         f2fs_mark_inode_dirty_sync(new_dir, false);
1273
1274         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1275                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1276                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1277         }
1278
1279         f2fs_unlock_op(sbi);
1280
1281         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1282                 f2fs_sync_fs(sbi->sb, 1);
1283
1284         f2fs_update_time(sbi, REQ_TIME);
1285         return 0;
1286 out_new_dir:
1287         if (new_dir_entry) {
1288                 f2fs_put_page(new_dir_page, 0);
1289         }
1290 out_old_dir:
1291         if (old_dir_entry) {
1292                 f2fs_put_page(old_dir_page, 0);
1293         }
1294 out_new:
1295         f2fs_put_page(new_page, 0);
1296 out_old:
1297         f2fs_put_page(old_page, 0);
1298 out:
1299         return err;
1300 }
1301
1302 static int f2fs_rename2(struct user_namespace *mnt_userns,
1303                         struct inode *old_dir, struct dentry *old_dentry,
1304                         struct inode *new_dir, struct dentry *new_dentry,
1305                         unsigned int flags)
1306 {
1307         int err;
1308
1309         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1310                 return -EINVAL;
1311
1312         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1313                                      flags);
1314         if (err)
1315                 return err;
1316
1317         if (flags & RENAME_EXCHANGE) {
1318                 return f2fs_cross_rename(old_dir, old_dentry,
1319                                          new_dir, new_dentry);
1320         }
1321         /*
1322          * VFS has already handled the new dentry existence case,
1323          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1324          */
1325         return f2fs_rename(mnt_userns, old_dir, old_dentry,
1326                                         new_dir, new_dentry, flags);
1327 }
1328
1329 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1330                                            struct inode *inode,
1331                                            struct delayed_call *done)
1332 {
1333         struct page *page;
1334         const char *target;
1335
1336         if (!dentry)
1337                 return ERR_PTR(-ECHILD);
1338
1339         page = read_mapping_page(inode->i_mapping, 0, NULL);
1340         if (IS_ERR(page))
1341                 return ERR_CAST(page);
1342
1343         target = fscrypt_get_symlink(inode, page_address(page),
1344                                      inode->i_sb->s_blocksize, done);
1345         put_page(page);
1346         return target;
1347 }
1348
1349 static int f2fs_encrypted_symlink_getattr(struct user_namespace *mnt_userns,
1350                                           const struct path *path,
1351                                           struct kstat *stat, u32 request_mask,
1352                                           unsigned int query_flags)
1353 {
1354         f2fs_getattr(mnt_userns, path, stat, request_mask, query_flags);
1355
1356         return fscrypt_symlink_getattr(path, stat);
1357 }
1358
1359 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1360         .get_link       = f2fs_encrypted_get_link,
1361         .getattr        = f2fs_encrypted_symlink_getattr,
1362         .setattr        = f2fs_setattr,
1363         .listxattr      = f2fs_listxattr,
1364 };
1365
1366 const struct inode_operations f2fs_dir_inode_operations = {
1367         .create         = f2fs_create,
1368         .lookup         = f2fs_lookup,
1369         .link           = f2fs_link,
1370         .unlink         = f2fs_unlink,
1371         .symlink        = f2fs_symlink,
1372         .mkdir          = f2fs_mkdir,
1373         .rmdir          = f2fs_rmdir,
1374         .mknod          = f2fs_mknod,
1375         .rename         = f2fs_rename2,
1376         .tmpfile        = f2fs_tmpfile,
1377         .getattr        = f2fs_getattr,
1378         .setattr        = f2fs_setattr,
1379         .get_acl        = f2fs_get_acl,
1380         .set_acl        = f2fs_set_acl,
1381         .listxattr      = f2fs_listxattr,
1382         .fiemap         = f2fs_fiemap,
1383         .fileattr_get   = f2fs_fileattr_get,
1384         .fileattr_set   = f2fs_fileattr_set,
1385 };
1386
1387 const struct inode_operations f2fs_symlink_inode_operations = {
1388         .get_link       = f2fs_get_link,
1389         .getattr        = f2fs_getattr,
1390         .setattr        = f2fs_setattr,
1391         .listxattr      = f2fs_listxattr,
1392 };
1393
1394 const struct inode_operations f2fs_special_inode_operations = {
1395         .getattr        = f2fs_getattr,
1396         .setattr        = f2fs_setattr,
1397         .get_acl        = f2fs_get_acl,
1398         .set_acl        = f2fs_set_acl,
1399         .listxattr      = f2fs_listxattr,
1400 };