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/dcache.h>
  14 #include <linux/namei.h>
  15 #include <linux/quotaops.h>
  16
  17 #include "f2fs.h"
  18 #include "node.h"
  19 #include "segment.h"
  20 #include "xattr.h"
  21 #include "acl.h"
  22 #include <trace/events/f2fs.h>
  23
  24 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
  25 {
  26         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
  27         nid_t ino;
  28         struct inode *inode;
  29         bool nid_free = false;
  30         int xattr_size = 0;
  31         int err;
  32
  33         inode = new_inode(dir->i_sb);
  34         if (!inode)
  35                 return ERR_PTR(-ENOMEM);
  36
  37         f2fs_lock_op(sbi);
  38         if (!f2fs_alloc_nid(sbi, &ino)) {
  39                 f2fs_unlock_op(sbi);
  40                 err = -ENOSPC;
  41                 goto fail;
  42         }
  43         f2fs_unlock_op(sbi);
  44
  45         nid_free = true;
  46
  47         inode_init_owner(inode, dir, mode);
  48
  49         inode->i_ino = ino;
  50         inode->i_blocks = 0;
  51         inode->i_mtime = inode->i_atime = inode->i_ctime =
  52                         F2FS_I(inode)->i_crtime = current_time(inode);
  53         inode->i_generation = sbi->s_next_generation++;
  54
  55         if (S_ISDIR(inode->i_mode))
  56                 F2FS_I(inode)->i_current_depth = 1;
  57
  58         err = insert_inode_locked(inode);
  59         if (err) {
  60                 err = -EINVAL;
  61                 goto fail;
  62         }
  63
  64         if (f2fs_sb_has_project_quota(sbi) &&
  65                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
  66                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
  67         else
  68                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
  69                                                         F2FS_DEF_PROJID);
  70
  71         err = dquot_initialize(inode);
  72         if (err)
  73                 goto fail_drop;
  74
  75         set_inode_flag(inode, FI_NEW_INODE);
  76
  77         /* If the directory encrypted, then we should encrypt the inode. */
  78         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
  79                                 f2fs_may_encrypt(inode))
  80                 f2fs_set_encrypted_inode(inode);
  81
  82         if (f2fs_sb_has_extra_attr(sbi)) {
  83                 set_inode_flag(inode, FI_EXTRA_ATTR);
  84                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
  85         }
  86
  87         if (test_opt(sbi, INLINE_XATTR))
  88                 set_inode_flag(inode, FI_INLINE_XATTR);
  89
  90         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
  91                 set_inode_flag(inode, FI_INLINE_DATA);
  92         if (f2fs_may_inline_dentry(inode))
  93                 set_inode_flag(inode, FI_INLINE_DENTRY);
  94
  95         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
  96                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
  97                 if (f2fs_has_inline_xattr(inode))
  98                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
  99                 /* Otherwise, will be 0 */
 100         } else if (f2fs_has_inline_xattr(inode) ||
 101                                 f2fs_has_inline_dentry(inode)) {
 102                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 103         }
 104         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
 105
 106         f2fs_init_extent_tree(inode, NULL);
 107
 108         stat_inc_inline_xattr(inode);
 109         stat_inc_inline_inode(inode);
 110         stat_inc_inline_dir(inode);
 111
 112         F2FS_I(inode)->i_flags =
 113                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
 114
 115         if (S_ISDIR(inode->i_mode))
 116                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
 117
 118         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
 119                 set_inode_flag(inode, FI_PROJ_INHERIT);
 120
 121         f2fs_set_inode_flags(inode);
 122
 123         trace_f2fs_new_inode(inode, 0);
 124         return inode;
 125
 126 fail:
 127         trace_f2fs_new_inode(inode, err);
 128         make_bad_inode(inode);
 129         if (nid_free)
 130                 set_inode_flag(inode, FI_FREE_NID);
 131         iput(inode);
 132         return ERR_PTR(err);
 133 fail_drop:
 134         trace_f2fs_new_inode(inode, err);
 135         dquot_drop(inode);
 136         inode->i_flags |= S_NOQUOTA;
 137         if (nid_free)
 138                 set_inode_flag(inode, FI_FREE_NID);
 139         clear_nlink(inode);
 140         unlock_new_inode(inode);
 141         iput(inode);
 142         return ERR_PTR(err);
 143 }
 144
 145 static int is_extension_exist(const unsigned char *s, const char *sub)
 146 {
 147         size_t slen = strlen(s);
 148         size_t sublen = strlen(sub);
 149         int i;
 150
 151         /*
 152          * filename format of multimedia file should be defined as:
 153          * "filename + '.' + extension + (optional: '.' + temp extension)".
 154          */
 155         if (slen < sublen + 2)
 156                 return 0;
 157
 158         for (i = 1; i < slen - sublen; i++) {
 159                 if (s[i] != '.')
 160                         continue;
 161                 if (!strncasecmp(s + i + 1, sub, sublen))
 162                         return 1;
 163         }
 164
 165         return 0;
 166 }
 167
 168 /*
 169  * Set multimedia files as cold files for hot/cold data separation
 170  */
 171 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 172                 const unsigned char *name)
 173 {
 174         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 175         int i, cold_count, hot_count;
 176
 177         down_read(&sbi->sb_lock);
 178
 179         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 180         hot_count = sbi->raw_super->hot_ext_count;
 181
 182         for (i = 0; i < cold_count + hot_count; i++) {
 183                 if (is_extension_exist(name, extlist[i]))
 184                         break;
 185         }
 186
 187         up_read(&sbi->sb_lock);
 188
 189         if (i == cold_count + hot_count)
 190                 return;
 191
 192         if (i < cold_count)
 193                 file_set_cold(inode);
 194         else
 195                 file_set_hot(inode);
 196 }
 197
 198 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 199                                                         bool hot, bool set)
 200 {
 201         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
 202         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
 203         int hot_count = sbi->raw_super->hot_ext_count;
 204         int total_count = cold_count + hot_count;
 205         int start, count;
 206         int i;
 207
 208         if (set) {
 209                 if (total_count == F2FS_MAX_EXTENSION)
 210                         return -EINVAL;
 211         } else {
 212                 if (!hot && !cold_count)
 213                         return -EINVAL;
 214                 if (hot && !hot_count)
 215                         return -EINVAL;
 216         }
 217
 218         if (hot) {
 219                 start = cold_count;
 220                 count = total_count;
 221         } else {
 222                 start = 0;
 223                 count = cold_count;
 224         }
 225
 226         for (i = start; i < count; i++) {
 227                 if (strcmp(name, extlist[i]))
 228                         continue;
 229
 230                 if (set)
 231                         return -EINVAL;
 232
 233                 memcpy(extlist[i], extlist[i + 1],
 234                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
 235                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
 236                 if (hot)
 237                         sbi->raw_super->hot_ext_count = hot_count - 1;
 238                 else
 239                         sbi->raw_super->extension_count =
 240                                                 cpu_to_le32(cold_count - 1);
 241                 return 0;
 242         }
 243
 244         if (!set)
 245                 return -EINVAL;
 246
 247         if (hot) {
 248                 memcpy(extlist[count], name, strlen(name));
 249                 sbi->raw_super->hot_ext_count = hot_count + 1;
 250         } else {
 251                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
 252
 253                 memcpy(buf, &extlist[cold_count],
 254                                 F2FS_EXTENSION_LEN * hot_count);
 255                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
 256                 memcpy(extlist[cold_count], name, strlen(name));
 257                 memcpy(&extlist[cold_count + 1], buf,
 258                                 F2FS_EXTENSION_LEN * hot_count);
 259                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
 260         }
 261         return 0;
 262 }
 263
 264 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 265                                                 bool excl)
 266 {
 267         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 268         struct inode *inode;
 269         nid_t ino = 0;
 270         int err;
 271
 272         if (unlikely(f2fs_cp_error(sbi)))
 273                 return -EIO;
 274         err = f2fs_is_checkpoint_ready(sbi);
 275         if (err)
 276                 return err;
 277
 278         err = dquot_initialize(dir);
 279         if (err)
 280                 return err;
 281
 282         inode = f2fs_new_inode(dir, mode);
 283         if (IS_ERR(inode))
 284                 return PTR_ERR(inode);
 285
 286         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
 287                 set_file_temperature(sbi, inode, dentry->d_name.name);
 288
 289         inode->i_op = &f2fs_file_inode_operations;
 290         inode->i_fop = &f2fs_file_operations;
 291         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 292         ino = inode->i_ino;
 293
 294         f2fs_lock_op(sbi);
 295         err = f2fs_add_link(dentry, inode);
 296         if (err)
 297                 goto out;
 298         f2fs_unlock_op(sbi);
 299
 300         f2fs_alloc_nid_done(sbi, ino);
 301
 302         d_instantiate(dentry, inode);
 303         unlock_new_inode(inode);
 304
 305         if (IS_DIRSYNC(dir))
 306                 f2fs_sync_fs(sbi->sb, 1);
 307
 308         f2fs_balance_fs(sbi, true);
 309         return 0;
 310 out:
 311         f2fs_handle_failed_inode(inode);
 312         return err;
 313 }
 314
 315 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 316                 struct dentry *dentry)
 317 {
 318         struct inode *inode = d_inode(old_dentry);
 319         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 320         int err;
 321
 322         if (unlikely(f2fs_cp_error(sbi)))
 323                 return -EIO;
 324         err = f2fs_is_checkpoint_ready(sbi);
 325         if (err)
 326                 return err;
 327
 328         err = fscrypt_prepare_link(old_dentry, dir, dentry);
 329         if (err)
 330                 return err;
 331
 332         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 333                         (!projid_eq(F2FS_I(dir)->i_projid,
 334                         F2FS_I(old_dentry->d_inode)->i_projid)))
 335                 return -EXDEV;
 336
 337         err = dquot_initialize(dir);
 338         if (err)
 339                 return err;
 340
 341         f2fs_balance_fs(sbi, true);
 342
 343         inode->i_ctime = current_time(inode);
 344         ihold(inode);
 345
 346         set_inode_flag(inode, FI_INC_LINK);
 347         f2fs_lock_op(sbi);
 348         err = f2fs_add_link(dentry, inode);
 349         if (err)
 350                 goto out;
 351         f2fs_unlock_op(sbi);
 352
 353         d_instantiate(dentry, inode);
 354
 355         if (IS_DIRSYNC(dir))
 356                 f2fs_sync_fs(sbi->sb, 1);
 357         return 0;
 358 out:
 359         clear_inode_flag(inode, FI_INC_LINK);
 360         iput(inode);
 361         f2fs_unlock_op(sbi);
 362         return err;
 363 }
 364
 365 struct dentry *f2fs_get_parent(struct dentry *child)
 366 {
 367         struct qstr dotdot = QSTR_INIT("..", 2);
 368         struct page *page;
 369         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
 370         if (!ino) {
 371                 if (IS_ERR(page))
 372                         return ERR_CAST(page);
 373                 return ERR_PTR(-ENOENT);
 374         }
 375         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
 376 }
 377
 378 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
 379 {
 380         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 381         struct qstr dot = QSTR_INIT(".", 1);
 382         struct qstr dotdot = QSTR_INIT("..", 2);
 383         struct f2fs_dir_entry *de;
 384         struct page *page;
 385         int err = 0;
 386
 387         if (f2fs_readonly(sbi->sb)) {
 388                 f2fs_msg(sbi->sb, KERN_INFO,
 389                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
 390                         "in readonly mountpoint", dir->i_ino, pino);
 391                 return 0;
 392         }
 393
 394         err = dquot_initialize(dir);
 395         if (err)
 396                 return err;
 397
 398         f2fs_balance_fs(sbi, true);
 399
 400         f2fs_lock_op(sbi);
 401
 402         de = f2fs_find_entry(dir, &dot, &page);
 403         if (de) {
 404                 f2fs_put_page(page, 0);
 405         } else if (IS_ERR(page)) {
 406                 err = PTR_ERR(page);
 407                 goto out;
 408         } else {
 409                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
 410                 if (err)
 411                         goto out;
 412         }
 413
 414         de = f2fs_find_entry(dir, &dotdot, &page);
 415         if (de)
 416                 f2fs_put_page(page, 0);
 417         else if (IS_ERR(page))
 418                 err = PTR_ERR(page);
 419         else
 420                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
 421 out:
 422         if (!err)
 423                 clear_inode_flag(dir, FI_INLINE_DOTS);
 424
 425         f2fs_unlock_op(sbi);
 426         return err;
 427 }
 428
 429 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
 430                 unsigned int flags)
 431 {
 432         struct inode *inode = NULL;
 433         struct f2fs_dir_entry *de;
 434         struct page *page;
 435         struct dentry *new;
 436         nid_t ino = -1;
 437         int err = 0;
 438         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
 439
 440         trace_f2fs_lookup_start(dir, dentry, flags);
 441
 442         err = fscrypt_prepare_lookup(dir, dentry, flags);
 443         if (err)
 444                 goto out;
 445
 446         if (dentry->d_name.len > F2FS_NAME_LEN) {
 447                 err = -ENAMETOOLONG;
 448                 goto out;
 449         }
 450
 451         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 452         if (!de) {
 453                 if (IS_ERR(page)) {
 454                         err = PTR_ERR(page);
 455                         goto out;
 456                 }
 457                 goto out_splice;
 458         }
 459
 460         ino = le32_to_cpu(de->ino);
 461         f2fs_put_page(page, 0);
 462
 463         inode = f2fs_iget(dir->i_sb, ino);
 464         if (IS_ERR(inode)) {
 465                 err = PTR_ERR(inode);
 466                 goto out;
 467         }
 468
 469         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
 470                 err = __recover_dot_dentries(dir, root_ino);
 471                 if (err)
 472                         goto out_iput;
 473         }
 474
 475         if (f2fs_has_inline_dots(inode)) {
 476                 err = __recover_dot_dentries(inode, dir->i_ino);
 477                 if (err)
 478                         goto out_iput;
 479         }
 480         if (f2fs_encrypted_inode(dir) &&
 481             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
 482             !fscrypt_has_permitted_context(dir, inode)) {
 483                 f2fs_msg(inode->i_sb, KERN_WARNING,
 484                          "Inconsistent encryption contexts: %lu/%lu",
 485                          dir->i_ino, inode->i_ino);
 486                 err = -EPERM;
 487                 goto out_iput;
 488         }
 489 out_splice:
 490         new = d_splice_alias(inode, dentry);
 491         if (IS_ERR(new))
 492                 err = PTR_ERR(new);
 493         trace_f2fs_lookup_end(dir, dentry, ino, err);
 494         return new;
 495 out_iput:
 496         iput(inode);
 497 out:
 498         trace_f2fs_lookup_end(dir, dentry, ino, err);
 499         return ERR_PTR(err);
 500 }
 501
 502 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
 503 {
 504         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 505         struct inode *inode = d_inode(dentry);
 506         struct f2fs_dir_entry *de;
 507         struct page *page;
 508         int err = -ENOENT;
 509
 510         trace_f2fs_unlink_enter(dir, dentry);
 511
 512         if (unlikely(f2fs_cp_error(sbi)))
 513                 return -EIO;
 514
 515         err = dquot_initialize(dir);
 516         if (err)
 517                 return err;
 518         err = dquot_initialize(inode);
 519         if (err)
 520                 return err;
 521
 522         de = f2fs_find_entry(dir, &dentry->d_name, &page);
 523         if (!de) {
 524                 if (IS_ERR(page))
 525                         err = PTR_ERR(page);
 526                 goto fail;
 527         }
 528
 529         f2fs_balance_fs(sbi, true);
 530
 531         f2fs_lock_op(sbi);
 532         err = f2fs_acquire_orphan_inode(sbi);
 533         if (err) {
 534                 f2fs_unlock_op(sbi);
 535                 f2fs_put_page(page, 0);
 536                 goto fail;
 537         }
 538         f2fs_delete_entry(de, page, dir, inode);
 539         f2fs_unlock_op(sbi);
 540
 541         if (IS_DIRSYNC(dir))
 542                 f2fs_sync_fs(sbi->sb, 1);
 543 fail:
 544         trace_f2fs_unlink_exit(inode, err);
 545         return err;
 546 }
 547
 548 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
 549 {
 550         const char *link = page_follow_link_light(dentry, cookie);
 551         if (!IS_ERR(link) && !*link) {
 552                 /* this is broken symlink case */
 553                 page_put_link(NULL, *cookie);
 554                 link = ERR_PTR(-ENOENT);
 555         }
 556         return link;
 557 }
 558
 559 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
 560                                         const char *symname)
 561 {
 562         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 563         struct inode *inode;
 564         size_t len = strlen(symname);
 565         struct fscrypt_str disk_link;
 566         int err;
 567
 568         if (unlikely(f2fs_cp_error(sbi)))
 569                 return -EIO;
 570         err = f2fs_is_checkpoint_ready(sbi);
 571         if (err)
 572                 return err;
 573
 574         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
 575                                       &disk_link);
 576         if (err)
 577                 return err;
 578
 579         err = dquot_initialize(dir);
 580         if (err)
 581                 return err;
 582
 583         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
 584         if (IS_ERR(inode))
 585                 return PTR_ERR(inode);
 586
 587         if (IS_ENCRYPTED(inode))
 588                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
 589         else
 590                 inode->i_op = &f2fs_symlink_inode_operations;
 591         inode_nohighmem(inode);
 592         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 593
 594         f2fs_lock_op(sbi);
 595         err = f2fs_add_link(dentry, inode);
 596         if (err)
 597                 goto out_f2fs_handle_failed_inode;
 598         f2fs_unlock_op(sbi);
 599         f2fs_alloc_nid_done(sbi, inode->i_ino);
 600
 601         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
 602         if (err)
 603                 goto err_out;
 604
 605         err = page_symlink(inode, disk_link.name, disk_link.len);
 606
 607 err_out:
 608         d_instantiate(dentry, inode);
 609         unlock_new_inode(inode);
 610
 611         /*
 612          * Let's flush symlink data in order to avoid broken symlink as much as
 613          * possible. Nevertheless, fsyncing is the best way, but there is no
 614          * way to get a file descriptor in order to flush that.
 615          *
 616          * Note that, it needs to do dir->fsync to make this recoverable.
 617          * If the symlink path is stored into inline_data, there is no
 618          * performance regression.
 619          */
 620         if (!err) {
 621                 filemap_write_and_wait_range(inode->i_mapping, 0,
 622                                                         disk_link.len - 1);
 623
 624                 if (IS_DIRSYNC(dir))
 625                         f2fs_sync_fs(sbi->sb, 1);
 626         } else {
 627                 f2fs_unlink(dir, dentry);
 628         }
 629
 630         f2fs_balance_fs(sbi, true);
 631         goto out_free_encrypted_link;
 632
 633 out_f2fs_handle_failed_inode:
 634         f2fs_handle_failed_inode(inode);
 635 out_free_encrypted_link:
 636         if (disk_link.name != (unsigned char *)symname)
 637                 kvfree(disk_link.name);
 638         return err;
 639 }
 640
 641 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 642 {
 643         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 644         struct inode *inode;
 645         int err;
 646
 647         if (unlikely(f2fs_cp_error(sbi)))
 648                 return -EIO;
 649
 650         err = dquot_initialize(dir);
 651         if (err)
 652                 return err;
 653
 654         inode = f2fs_new_inode(dir, S_IFDIR | mode);
 655         if (IS_ERR(inode))
 656                 return PTR_ERR(inode);
 657
 658         inode->i_op = &f2fs_dir_inode_operations;
 659         inode->i_fop = &f2fs_dir_operations;
 660         inode->i_mapping->a_ops = &f2fs_dblock_aops;
 661         inode_nohighmem(inode);
 662
 663         set_inode_flag(inode, FI_INC_LINK);
 664         f2fs_lock_op(sbi);
 665         err = f2fs_add_link(dentry, inode);
 666         if (err)
 667                 goto out_fail;
 668         f2fs_unlock_op(sbi);
 669
 670         f2fs_alloc_nid_done(sbi, inode->i_ino);
 671
 672         d_instantiate(dentry, inode);
 673         unlock_new_inode(inode);
 674
 675         if (IS_DIRSYNC(dir))
 676                 f2fs_sync_fs(sbi->sb, 1);
 677
 678         f2fs_balance_fs(sbi, true);
 679         return 0;
 680
 681 out_fail:
 682         clear_inode_flag(inode, FI_INC_LINK);
 683         f2fs_handle_failed_inode(inode);
 684         return err;
 685 }
 686
 687 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 688 {
 689         struct inode *inode = d_inode(dentry);
 690         if (f2fs_empty_dir(inode))
 691                 return f2fs_unlink(dir, dentry);
 692         return -ENOTEMPTY;
 693 }
 694
 695 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
 696                                 umode_t mode, dev_t rdev)
 697 {
 698         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 699         struct inode *inode;
 700         int err = 0;
 701
 702         if (unlikely(f2fs_cp_error(sbi)))
 703                 return -EIO;
 704         err = f2fs_is_checkpoint_ready(sbi);
 705         if (err)
 706                 return err;
 707
 708         err = dquot_initialize(dir);
 709         if (err)
 710                 return err;
 711
 712         inode = f2fs_new_inode(dir, mode);
 713         if (IS_ERR(inode))
 714                 return PTR_ERR(inode);
 715
 716         init_special_inode(inode, inode->i_mode, rdev);
 717         inode->i_op = &f2fs_special_inode_operations;
 718
 719         f2fs_lock_op(sbi);
 720         err = f2fs_add_link(dentry, inode);
 721         if (err)
 722                 goto out;
 723         f2fs_unlock_op(sbi);
 724
 725         f2fs_alloc_nid_done(sbi, inode->i_ino);
 726
 727         d_instantiate(dentry, inode);
 728         unlock_new_inode(inode);
 729
 730         if (IS_DIRSYNC(dir))
 731                 f2fs_sync_fs(sbi->sb, 1);
 732
 733         f2fs_balance_fs(sbi, true);
 734         return 0;
 735 out:
 736         f2fs_handle_failed_inode(inode);
 737         return err;
 738 }
 739
 740 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
 741                                         umode_t mode, struct inode **whiteout)
 742 {
 743         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 744         struct inode *inode;
 745         int err;
 746
 747         err = dquot_initialize(dir);
 748         if (err)
 749                 return err;
 750
 751         inode = f2fs_new_inode(dir, mode);
 752         if (IS_ERR(inode))
 753                 return PTR_ERR(inode);
 754
 755         if (whiteout) {
 756                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
 757                 inode->i_op = &f2fs_special_inode_operations;
 758         } else {
 759                 inode->i_op = &f2fs_file_inode_operations;
 760                 inode->i_fop = &f2fs_file_operations;
 761                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
 762         }
 763
 764         f2fs_lock_op(sbi);
 765         err = f2fs_acquire_orphan_inode(sbi);
 766         if (err)
 767                 goto out;
 768
 769         err = f2fs_do_tmpfile(inode, dir);
 770         if (err)
 771                 goto release_out;
 772
 773         /*
 774          * add this non-linked tmpfile to orphan list, in this way we could
 775          * remove all unused data of tmpfile after abnormal power-off.
 776          */
 777         f2fs_add_orphan_inode(inode);
 778         f2fs_alloc_nid_done(sbi, inode->i_ino);
 779
 780         if (whiteout) {
 781                 f2fs_i_links_write(inode, false);
 782                 *whiteout = inode;
 783         } else {
 784                 d_tmpfile(dentry, inode);
 785         }
 786         /* link_count was changed by d_tmpfile as well. */
 787         f2fs_unlock_op(sbi);
 788         unlock_new_inode(inode);
 789
 790         f2fs_balance_fs(sbi, true);
 791         return 0;
 792
 793 release_out:
 794         f2fs_release_orphan_inode(sbi);
 795 out:
 796         f2fs_handle_failed_inode(inode);
 797         return err;
 798 }
 799
 800 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 801 {
 802         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
 803
 804         if (unlikely(f2fs_cp_error(sbi)))
 805                 return -EIO;
 806
 807         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
 808                 int err = fscrypt_get_encryption_info(dir);
 809                 if (err)
 810                         return err;
 811         }
 812
 813         return __f2fs_tmpfile(dir, dentry, mode, NULL);
 814 }
 815
 816 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
 817 {
 818         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 819                 return -EIO;
 820
 821         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
 822 }
 823
 824 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
 825                         struct inode *new_dir, struct dentry *new_dentry,
 826                         unsigned int flags)
 827 {
 828         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
 829         struct inode *old_inode = d_inode(old_dentry);
 830         struct inode *new_inode = d_inode(new_dentry);
 831         struct inode *whiteout = NULL;
 832         struct page *old_dir_page;
 833         struct page *old_page, *new_page = NULL;
 834         struct f2fs_dir_entry *old_dir_entry = NULL;
 835         struct f2fs_dir_entry *old_entry;
 836         struct f2fs_dir_entry *new_entry;
 837         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
 838         int err;
 839
 840         if (unlikely(f2fs_cp_error(sbi)))
 841                 return -EIO;
 842         err = f2fs_is_checkpoint_ready(sbi);
 843         if (err)
 844                 return err;
 845
 846         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
 847                         (!projid_eq(F2FS_I(new_dir)->i_projid,
 848                         F2FS_I(old_dentry->d_inode)->i_projid)))
 849                 return -EXDEV;
 850
 851         err = dquot_initialize(old_dir);
 852         if (err)
 853                 goto out;
 854
 855         err = dquot_initialize(new_dir);
 856         if (err)
 857                 goto out;
 858
 859         if (new_inode) {
 860                 err = dquot_initialize(new_inode);
 861                 if (err)
 862                         goto out;
 863         }
 864
 865         err = -ENOENT;
 866         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
 867         if (!old_entry) {
 868                 if (IS_ERR(old_page))
 869                         err = PTR_ERR(old_page);
 870                 goto out;
 871         }
 872
 873         if (S_ISDIR(old_inode->i_mode)) {
 874                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
 875                 if (!old_dir_entry) {
 876                         if (IS_ERR(old_dir_page))
 877                                 err = PTR_ERR(old_dir_page);
 878                         goto out_old;
 879                 }
 880         }
 881
 882         if (flags & RENAME_WHITEOUT) {
 883                 err = f2fs_create_whiteout(old_dir, &whiteout);
 884                 if (err)
 885                         goto out_dir;
 886         }
 887
 888         if (new_inode) {
 889
 890                 err = -ENOTEMPTY;
 891                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
 892                         goto out_whiteout;
 893
 894                 err = -ENOENT;
 895                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
 896                                                 &new_page);
 897                 if (!new_entry) {
 898                         if (IS_ERR(new_page))
 899                                 err = PTR_ERR(new_page);
 900                         goto out_whiteout;
 901                 }
 902
 903                 f2fs_balance_fs(sbi, true);
 904
 905                 f2fs_lock_op(sbi);
 906
 907                 err = f2fs_acquire_orphan_inode(sbi);
 908                 if (err)
 909                         goto put_out_dir;
 910
 911                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
 912
 913                 new_inode->i_ctime = current_time(new_inode);
 914                 down_write(&F2FS_I(new_inode)->i_sem);
 915                 if (old_dir_entry)
 916                         f2fs_i_links_write(new_inode, false);
 917                 f2fs_i_links_write(new_inode, false);
 918                 up_write(&F2FS_I(new_inode)->i_sem);
 919
 920                 if (!new_inode->i_nlink)
 921                         f2fs_add_orphan_inode(new_inode);
 922                 else
 923                         f2fs_release_orphan_inode(sbi);
 924         } else {
 925                 f2fs_balance_fs(sbi, true);
 926
 927                 f2fs_lock_op(sbi);
 928
 929                 err = f2fs_add_link(new_dentry, old_inode);
 930                 if (err) {
 931                         f2fs_unlock_op(sbi);
 932                         goto out_whiteout;
 933                 }
 934
 935                 if (old_dir_entry)
 936                         f2fs_i_links_write(new_dir, true);
 937
 938                 /*
 939                  * old entry and new entry can locate in the same inline
 940                  * dentry in inode, when attaching new entry in inline dentry,
 941                  * it could force inline dentry conversion, after that,
 942                  * old_entry and old_page will point to wrong address, in
 943                  * order to avoid this, let's do the check and update here.
 944                  */
 945                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
 946                         f2fs_put_page(old_page, 0);
 947                         old_page = NULL;
 948
 949                         old_entry = f2fs_find_entry(old_dir,
 950                                                 &old_dentry->d_name, &old_page);
 951                         if (!old_entry) {
 952                                 err = -ENOENT;
 953                                 if (IS_ERR(old_page))
 954                                         err = PTR_ERR(old_page);
 955                                 f2fs_unlock_op(sbi);
 956                                 goto out_whiteout;
 957                         }
 958                 }
 959         }
 960
 961         down_write(&F2FS_I(old_inode)->i_sem);
 962         if (!old_dir_entry || whiteout)
 963                 file_lost_pino(old_inode);
 964         else
 965                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
 966         up_write(&F2FS_I(old_inode)->i_sem);
 967
 968         old_inode->i_ctime = current_time(old_inode);
 969         f2fs_mark_inode_dirty_sync(old_inode, false);
 970
 971         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
 972
 973         if (whiteout) {
 974                 whiteout->i_state |= I_LINKABLE;
 975                 set_inode_flag(whiteout, FI_INC_LINK);
 976                 err = f2fs_add_link(old_dentry, whiteout);
 977                 if (err)
 978                         goto put_out_dir;
 979                 whiteout->i_state &= ~I_LINKABLE;
 980                 iput(whiteout);
 981         }
 982
 983         if (old_dir_entry) {
 984                 if (old_dir != new_dir && !whiteout)
 985                         f2fs_set_link(old_inode, old_dir_entry,
 986                                                 old_dir_page, new_dir);
 987                 else
 988                         f2fs_put_page(old_dir_page, 0);
 989                 f2fs_i_links_write(old_dir, false);
 990         }
 991         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
 992                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
 993                 if (S_ISDIR(old_inode->i_mode))
 994                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
 995                                                         TRANS_DIR_INO);
 996         }
 997
 998         f2fs_unlock_op(sbi);
 999
1000         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1001                 f2fs_sync_fs(sbi->sb, 1);
1002
1003         f2fs_update_time(sbi, REQ_TIME);
1004         return 0;
1005
1006 put_out_dir:
1007         f2fs_unlock_op(sbi);
1008         if (new_page)
1009                 f2fs_put_page(new_page, 0);
1010 out_whiteout:
1011         if (whiteout)
1012                 iput(whiteout);
1013 out_dir:
1014         if (old_dir_entry)
1015                 f2fs_put_page(old_dir_page, 0);
1016 out_old:
1017         f2fs_put_page(old_page, 0);
1018 out:
1019         return err;
1020 }
1021
1022 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1023                              struct inode *new_dir, struct dentry *new_dentry)
1024 {
1025         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1026         struct inode *old_inode = d_inode(old_dentry);
1027         struct inode *new_inode = d_inode(new_dentry);
1028         struct page *old_dir_page, *new_dir_page;
1029         struct page *old_page, *new_page;
1030         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1031         struct f2fs_dir_entry *old_entry, *new_entry;
1032         int old_nlink = 0, new_nlink = 0;
1033         int err;
1034
1035         if (unlikely(f2fs_cp_error(sbi)))
1036                 return -EIO;
1037         err = f2fs_is_checkpoint_ready(sbi);
1038         if (err)
1039                 return err;
1040
1041         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1042                         !projid_eq(F2FS_I(new_dir)->i_projid,
1043                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1044             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1045                         !projid_eq(F2FS_I(old_dir)->i_projid,
1046                         F2FS_I(new_dentry->d_inode)->i_projid)))
1047                 return -EXDEV;
1048
1049         err = dquot_initialize(old_dir);
1050         if (err)
1051                 goto out;
1052
1053         err = dquot_initialize(new_dir);
1054         if (err)
1055                 goto out;
1056
1057         err = -ENOENT;
1058         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1059         if (!old_entry) {
1060                 if (IS_ERR(old_page))
1061                         err = PTR_ERR(old_page);
1062                 goto out;
1063         }
1064
1065         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1066         if (!new_entry) {
1067                 if (IS_ERR(new_page))
1068                         err = PTR_ERR(new_page);
1069                 goto out_old;
1070         }
1071
1072         /* prepare for updating ".." directory entry info later */
1073         if (old_dir != new_dir) {
1074                 if (S_ISDIR(old_inode->i_mode)) {
1075                         old_dir_entry = f2fs_parent_dir(old_inode,
1076                                                         &old_dir_page);
1077                         if (!old_dir_entry) {
1078                                 if (IS_ERR(old_dir_page))
1079                                         err = PTR_ERR(old_dir_page);
1080                                 goto out_new;
1081                         }
1082                 }
1083
1084                 if (S_ISDIR(new_inode->i_mode)) {
1085                         new_dir_entry = f2fs_parent_dir(new_inode,
1086                                                         &new_dir_page);
1087                         if (!new_dir_entry) {
1088                                 if (IS_ERR(new_dir_page))
1089                                         err = PTR_ERR(new_dir_page);
1090                                 goto out_old_dir;
1091                         }
1092                 }
1093         }
1094
1095         /*
1096          * If cross rename between file and directory those are not
1097          * in the same directory, we will inc nlink of file's parent
1098          * later, so we should check upper boundary of its nlink.
1099          */
1100         if ((!old_dir_entry || !new_dir_entry) &&
1101                                 old_dir_entry != new_dir_entry) {
1102                 old_nlink = old_dir_entry ? -1 : 1;
1103                 new_nlink = -old_nlink;
1104                 err = -EMLINK;
1105                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1106                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1107                         goto out_new_dir;
1108         }
1109
1110         f2fs_balance_fs(sbi, true);
1111
1112         f2fs_lock_op(sbi);
1113
1114         /* update ".." directory entry info of old dentry */
1115         if (old_dir_entry)
1116                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1117
1118         /* update ".." directory entry info of new dentry */
1119         if (new_dir_entry)
1120                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1121
1122         /* update directory entry info of old dir inode */
1123         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1124
1125         down_write(&F2FS_I(old_inode)->i_sem);
1126         file_lost_pino(old_inode);
1127         up_write(&F2FS_I(old_inode)->i_sem);
1128
1129         old_dir->i_ctime = current_time(old_dir);
1130         if (old_nlink) {
1131                 down_write(&F2FS_I(old_dir)->i_sem);
1132                 f2fs_i_links_write(old_dir, old_nlink > 0);
1133                 up_write(&F2FS_I(old_dir)->i_sem);
1134         }
1135         f2fs_mark_inode_dirty_sync(old_dir, false);
1136
1137         /* update directory entry info of new dir inode */
1138         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1139
1140         down_write(&F2FS_I(new_inode)->i_sem);
1141         file_lost_pino(new_inode);
1142         up_write(&F2FS_I(new_inode)->i_sem);
1143
1144         new_dir->i_ctime = current_time(new_dir);
1145         if (new_nlink) {
1146                 down_write(&F2FS_I(new_dir)->i_sem);
1147                 f2fs_i_links_write(new_dir, new_nlink > 0);
1148                 up_write(&F2FS_I(new_dir)->i_sem);
1149         }
1150         f2fs_mark_inode_dirty_sync(new_dir, false);
1151
1152         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1153                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1154                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1155         }
1156
1157         f2fs_unlock_op(sbi);
1158
1159         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1160                 f2fs_sync_fs(sbi->sb, 1);
1161
1162         f2fs_update_time(sbi, REQ_TIME);
1163         return 0;
1164 out_new_dir:
1165         if (new_dir_entry) {
1166                 f2fs_put_page(new_dir_page, 0);
1167         }
1168 out_old_dir:
1169         if (old_dir_entry) {
1170                 f2fs_put_page(old_dir_page, 0);
1171         }
1172 out_new:
1173         f2fs_put_page(new_page, 0);
1174 out_old:
1175         f2fs_put_page(old_page, 0);
1176 out:
1177         return err;
1178 }
1179
1180 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1181                         struct inode *new_dir, struct dentry *new_dentry,
1182                         unsigned int flags)
1183 {
1184         int err;
1185
1186         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1187                 return -EINVAL;
1188
1189         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1190                                      flags);
1191         if (err)
1192                 return err;
1193
1194         if (flags & RENAME_EXCHANGE) {
1195                 return f2fs_cross_rename(old_dir, old_dentry,
1196                                          new_dir, new_dentry);
1197         }
1198         /*
1199          * VFS has already handled the new dentry existence case,
1200          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1201          */
1202         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1203 }
1204
1205 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1206 {
1207         struct inode *inode = d_inode(dentry);
1208         struct page *page;
1209         void *target;
1210
1211         if (!dentry)
1212                 return ERR_PTR(-ECHILD);
1213
1214         page = read_mapping_page(inode->i_mapping, 0, NULL);
1215         if (IS_ERR(page))
1216                 return ERR_CAST(page);
1217
1218         target = fscrypt_get_symlink(inode, page_address(page),
1219                                      inode->i_sb->s_blocksize);
1220         put_page(page);
1221         return *cookie = target;
1222 }
1223
1224 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1225         .readlink       = generic_readlink,
1226         .follow_link    = f2fs_encrypted_follow_link,
1227         .put_link       = kfree_put_link,
1228         .getattr        = f2fs_getattr,
1229         .setattr        = f2fs_setattr,
1230 #ifdef CONFIG_F2FS_FS_XATTR
1231         .setxattr       = generic_setxattr,
1232         .getxattr       = generic_getxattr,
1233         .listxattr      = f2fs_listxattr,
1234         .removexattr    = generic_removexattr,
1235 #endif
1236 };
1237
1238 const struct inode_operations f2fs_dir_inode_operations = {
1239         .create         = f2fs_create,
1240         .lookup         = f2fs_lookup,
1241         .link           = f2fs_link,
1242         .unlink         = f2fs_unlink,
1243         .symlink        = f2fs_symlink,
1244         .mkdir          = f2fs_mkdir,
1245         .rmdir          = f2fs_rmdir,
1246         .mknod          = f2fs_mknod,
1247         .rename2        = f2fs_rename2,
1248         .tmpfile        = f2fs_tmpfile,
1249         .getattr        = f2fs_getattr,
1250         .setattr        = f2fs_setattr,
1251         .get_acl        = f2fs_get_acl,
1252         .set_acl        = f2fs_set_acl,
1253 #ifdef CONFIG_F2FS_FS_XATTR
1254         .setxattr       = generic_setxattr,
1255         .getxattr       = generic_getxattr,
1256         .listxattr      = f2fs_listxattr,
1257         .removexattr    = generic_removexattr,
1258 #endif
1259 };
1260
1261 const struct inode_operations f2fs_symlink_inode_operations = {
1262         .readlink       = generic_readlink,
1263         .follow_link    = f2fs_follow_link,
1264         .put_link       = page_put_link,
1265         .getattr        = f2fs_getattr,
1266         .setattr        = f2fs_setattr,
1267 #ifdef CONFIG_F2FS_FS_XATTR
1268         .setxattr       = generic_setxattr,
1269         .getxattr       = generic_getxattr,
1270         .listxattr      = f2fs_listxattr,
1271         .removexattr    = generic_removexattr,
1272 #endif
1273 };
1274
1275 const struct inode_operations f2fs_special_inode_operations = {
1276         .getattr        = f2fs_getattr,
1277         .setattr        = f2fs_setattr,
1278         .get_acl        = f2fs_get_acl,
1279         .set_acl        = f2fs_set_acl,
1280 #ifdef CONFIG_F2FS_FS_XATTR
1281         .setxattr       = generic_setxattr,
1282         .getxattr       = generic_getxattr,
1283         .listxattr      = f2fs_listxattr,
1284         .removexattr    = generic_removexattr,
1285 #endif
1286 };