src/ext4.c

   1 /*
   2  * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup lwext4
  30  * @{
  31  */
  32 /**
  33  * @file  ext4.h
  34  * @brief Ext4 high level operations (file, directory, mountpoints...)
  35  */
  36
  37 #include "ext4_config.h"
  38 #include "ext4_types.h"
  39 #include "ext4_misc.h"
  40 #include "ext4_errno.h"
  41 #include "ext4_oflags.h"
  42 #include "ext4_debug.h"
  43
  44 #include "ext4.h"
  45 #include "ext4_trans.h"
  46 #include "ext4_blockdev.h"
  47 #include "ext4_fs.h"
  48 #include "ext4_dir.h"
  49 #include "ext4_inode.h"
  50 #include "ext4_super.h"
  51 #include "ext4_block_group.h"
  52 #include "ext4_dir_idx.h"
  53 #include "ext4_xattr.h"
  54 #include "ext4_journal.h"
  55
  56
  57 #include <stdlib.h>
  58 #include <string.h>
  59
  60 /**@brief   Mount point OS dependent lock*/
  61 #define EXT4_MP_LOCK(_m)                                                       \
  62         do {                                                                   \
  63                 if ((_m)->os_locks)                                            \
  64                         (_m)->os_locks->lock();                                \
  65         } while (0)
  66
  67 /**@brief   Mount point OS dependent unlock*/
  68 #define EXT4_MP_UNLOCK(_m)                                                     \
  69         do {                                                                   \
  70                 if ((_m)->os_locks)                                            \
  71                         (_m)->os_locks->unlock();                              \
  72         } while (0)
  73
  74 /**@brief   Mount point descriptor.*/
  75 struct ext4_mountpoint {
  76
  77         /**@brief   Mount done flag.*/
  78         bool mounted;
  79
  80         /**@brief   Mount point name (@ref ext4_mount)*/
  81         char name[CONFIG_EXT4_MAX_MP_NAME + 1];
  82
  83         /**@brief   OS dependent lock/unlock functions.*/
  84         const struct ext4_lock *os_locks;
  85
  86         /**@brief   Ext4 filesystem internals.*/
  87         struct ext4_fs fs;
  88
  89         /**@brief   JBD fs.*/
  90         struct jbd_fs jbd_fs;
  91
  92         /**@brief   Journal.*/
  93         struct jbd_journal jbd_journal;
  94
  95         /**@brief   Block cache.*/
  96         struct ext4_bcache bc;
  97 };
  98
  99 /**@brief   Block devices descriptor.*/
 100 struct ext4_block_devices {
 101
 102         /**@brief   Block device name.*/
 103         char name[CONFIG_EXT4_MAX_BLOCKDEV_NAME + 1];
 104
 105         /**@brief   Block device handle.*/
 106         struct ext4_blockdev *bd;
 107 };
 108
 109 /**@brief   Block devices.*/
 110 static struct ext4_block_devices s_bdevices[CONFIG_EXT4_BLOCKDEVS_COUNT];
 111
 112 /**@brief   Mountpoints.*/
 113 static struct ext4_mountpoint s_mp[CONFIG_EXT4_MOUNTPOINTS_COUNT];
 114
 115 int ext4_device_register(struct ext4_blockdev *bd,
 116                          const char *dev_name)
 117 {
 118         ext4_assert(bd && dev_name);
 119
 120         if (strlen(dev_name) > CONFIG_EXT4_MAX_BLOCKDEV_NAME)
 121                 return EINVAL;
 122
 123         for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
 124                 if (!strcmp(s_bdevices[i].name, dev_name))
 125                         return EEXIST;
 126         }
 127
 128         for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
 129                 if (!s_bdevices[i].bd) {
 130                         strcpy(s_bdevices[i].name, dev_name);
 131                         s_bdevices[i].bd = bd;
 132                         return EOK;
 133                 }
 134         }
 135
 136         return ENOSPC;
 137 }
 138
 139 int ext4_device_unregister(const char *dev_name)
 140 {
 141         ext4_assert(dev_name);
 142
 143         for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
 144                 if (strcmp(s_bdevices[i].name, dev_name))
 145                         continue;
 146
 147                 memset(&s_bdevices[i], 0, sizeof(s_bdevices[i]));
 148         }
 149
 150         return ENOENT;
 151 }
 152
 153 int ext4_device_unregister_all(void)
 154 {
 155         memset(s_bdevices, 0, sizeof(s_bdevices));
 156
 157         return EOK;
 158 }
 159
 160 /****************************************************************************/
 161
 162 static bool ext4_is_dots(const uint8_t *name, size_t name_size)
 163 {
 164         if ((name_size == 1) && (name[0] == '.'))
 165                 return true;
 166
 167         if ((name_size == 2) && (name[0] == '.') && (name[1] == '.'))
 168                 return true;
 169
 170         return false;
 171 }
 172
 173 static int ext4_has_children(bool *has_children, struct ext4_inode_ref *enode)
 174 {
 175         struct ext4_sblock *sb = &enode->fs->sb;
 176
 177         /* Check if node is directory */
 178         if (!ext4_inode_is_type(sb, enode->inode, EXT4_INODE_MODE_DIRECTORY)) {
 179                 *has_children = false;
 180                 return EOK;
 181         }
 182
 183         struct ext4_dir_iter it;
 184         int rc = ext4_dir_iterator_init(&it, enode, 0);
 185         if (rc != EOK)
 186                 return rc;
 187
 188         /* Find a non-empty directory entry */
 189         bool found = false;
 190         while (it.curr != NULL) {
 191                 if (ext4_dir_en_get_inode(it.curr) != 0) {
 192                         uint16_t nsize;
 193                         nsize = ext4_dir_en_get_name_len(sb, it.curr);
 194                         if (!ext4_is_dots(it.curr->name, nsize)) {
 195                                 found = true;
 196                                 break;
 197                         }
 198                 }
 199
 200                 rc = ext4_dir_iterator_next(&it);
 201                 if (rc != EOK) {
 202                         ext4_dir_iterator_fini(&it);
 203                         return rc;
 204                 }
 205         }
 206
 207         rc = ext4_dir_iterator_fini(&it);
 208         if (rc != EOK)
 209                 return rc;
 210
 211         *has_children = found;
 212
 213         return EOK;
 214 }
 215
 216 static int ext4_link(struct ext4_mountpoint *mp, struct ext4_inode_ref *parent,
 217                      struct ext4_inode_ref *ch, const char *n,
 218                      uint32_t len, bool rename)
 219 {
 220         /* Check maximum name length */
 221         if (len > EXT4_DIRECTORY_FILENAME_LEN)
 222                 return EINVAL;
 223
 224         /* Add entry to parent directory */
 225         int r = ext4_dir_add_entry(parent, n, len, ch);
 226         if (r != EOK)
 227                 return r;
 228
 229         /* Fill new dir -> add '.' and '..' entries.
 230          * Also newly allocated inode should have 0 link count.
 231          */
 232
 233         bool is_dir = ext4_inode_is_type(&mp->fs.sb, ch->inode,
 234                                EXT4_INODE_MODE_DIRECTORY);
 235         if (is_dir && !rename) {
 236
 237 #if CONFIG_DIR_INDEX_ENABLE
 238                 /* Initialize directory index if supported */
 239                 if (ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_DIR_INDEX)) {
 240                         r = ext4_dir_dx_init(ch, parent);
 241                         if (r != EOK)
 242                                 return r;
 243
 244                         ext4_inode_set_flag(ch->inode, EXT4_INODE_FLAG_INDEX);
 245                         ch->dirty = true;
 246                 } else
 247 #endif
 248                 {
 249                         r = ext4_dir_add_entry(ch, ".", strlen("."), ch);
 250                         if (r != EOK) {
 251                                 ext4_dir_remove_entry(parent, n, strlen(n));
 252                                 return r;
 253                         }
 254
 255                         r = ext4_dir_add_entry(ch, "..", strlen(".."), parent);
 256                         if (r != EOK) {
 257                                 ext4_dir_remove_entry(parent, n, strlen(n));
 258                                 ext4_dir_remove_entry(ch, ".", strlen("."));
 259                                 return r;
 260                         }
 261                 }
 262
 263                 /*New empty directory. Two links (. and ..) */
 264                 ext4_inode_set_links_cnt(ch->inode, 2);
 265                 ext4_fs_inode_links_count_inc(parent);
 266                 ch->dirty = true;
 267                 parent->dirty = true;
 268                 return r;
 269         }
 270         /*
 271          * In case we want to rename a directory,
 272          * we reset the original '..' pointer.
 273          */
 274         if (is_dir) {
 275                 bool idx;
 276                 idx = ext4_inode_has_flag(ch->inode, EXT4_INODE_FLAG_INDEX);
 277                 struct ext4_dir_search_result res;
 278                 if (!idx) {
 279                         r = ext4_dir_find_entry(&res, ch, "..", strlen(".."));
 280                         if (r != EOK)
 281                                 return EIO;
 282
 283                         ext4_dir_en_set_inode(res.dentry, parent->index);
 284                         ext4_trans_set_block_dirty(res.block.buf);
 285                         r = ext4_dir_destroy_result(ch, &res);
 286                         if (r != EOK)
 287                                 return r;
 288
 289                 } else {
 290 #if CONFIG_DIR_INDEX_ENABLE
 291                         r = ext4_dir_dx_reset_parent_inode(ch, parent->index);
 292                         if (r != EOK)
 293                                 return r;
 294
 295 #endif
 296                 }
 297
 298                 ext4_fs_inode_links_count_inc(parent);
 299                 parent->dirty = true;
 300         }
 301         if (!rename) {
 302                 ext4_fs_inode_links_count_inc(ch);
 303                 ch->dirty = true;
 304         }
 305
 306         return r;
 307 }
 308
 309 static int ext4_unlink(struct ext4_mountpoint *mp,
 310                        struct ext4_inode_ref *parent,
 311                        struct ext4_inode_ref *child, const char *name,
 312                        uint32_t name_len)
 313 {
 314         bool has_children;
 315         int rc = ext4_has_children(&has_children, child);
 316         if (rc != EOK)
 317                 return rc;
 318
 319         /* Cannot unlink non-empty node */
 320         if (has_children)
 321                 return ENOTEMPTY;
 322
 323         /* Remove entry from parent directory */
 324         rc = ext4_dir_remove_entry(parent, name, name_len);
 325         if (rc != EOK)
 326                 return rc;
 327
 328         bool is_dir = ext4_inode_is_type(&mp->fs.sb, child->inode,
 329                                          EXT4_INODE_MODE_DIRECTORY);
 330
 331         /* If directory - handle links from parent */
 332         if (is_dir) {
 333                 ext4_fs_inode_links_count_dec(parent);
 334                 parent->dirty = true;
 335         }
 336
 337         /*
 338          * TODO: Update timestamps of the parent
 339          * (when we have wall-clock time).
 340          *
 341          * ext4_inode_set_change_inode_time(parent->inode, (uint32_t) now);
 342          * ext4_inode_set_modification_time(parent->inode, (uint32_t) now);
 343          * parent->dirty = true;
 344          */
 345
 346         /*
 347          * TODO: Update timestamp for inode.
 348          *
 349          * ext4_inode_set_change_inode_time(child->inode,
 350          *     (uint32_t) now);
 351          */
 352         if (ext4_inode_get_links_cnt(child->inode)) {
 353                 ext4_fs_inode_links_count_dec(child);
 354                 child->dirty = true;
 355         }
 356
 357         return EOK;
 358 }
 359
 360 /****************************************************************************/
 361
 362 int ext4_mount(const char *dev_name, const char *mount_point,
 363                bool read_only)
 364 {
 365         int r;
 366         uint32_t bsize;
 367         struct ext4_bcache *bc;
 368         struct ext4_blockdev *bd = 0;
 369         struct ext4_mountpoint *mp = 0;
 370
 371         ext4_assert(mount_point && dev_name);
 372
 373         size_t mp_len = strlen(mount_point);
 374
 375         if (mp_len > CONFIG_EXT4_MAX_MP_NAME)
 376                 return EINVAL;
 377
 378         if (mount_point[mp_len - 1] != '/')
 379                 return ENOTSUP;
 380
 381         for (size_t i = 0; i < CONFIG_EXT4_BLOCKDEVS_COUNT; ++i) {
 382                 if (s_bdevices[i].name) {
 383                         if (!strcmp(dev_name, s_bdevices[i].name)) {
 384                                 bd = s_bdevices[i].bd;
 385                                 break;
 386                         }
 387                 }
 388         }
 389
 390         if (!bd)
 391                 return ENODEV;
 392
 393         for (size_t i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
 394                 if (!s_mp[i].mounted) {
 395                         strcpy(s_mp[i].name, mount_point);
 396                         s_mp[i].mounted = 1;
 397                         mp = &s_mp[i];
 398                         break;
 399                 }
 400
 401                 if (!strcmp(s_mp[i].name, mount_point))
 402                         return EOK;
 403         }
 404
 405         if (!mp)
 406                 return ENOMEM;
 407
 408         r = ext4_block_init(bd);
 409         if (r != EOK)
 410                 return r;
 411
 412         r = ext4_fs_init(&mp->fs, bd, read_only);
 413         if (r != EOK) {
 414                 ext4_block_fini(bd);
 415                 return r;
 416         }
 417
 418         bsize = ext4_sb_get_block_size(&mp->fs.sb);
 419         ext4_block_set_lb_size(bd, bsize);
 420         bc = &mp->bc;
 421
 422         r = ext4_bcache_init_dynamic(bc, CONFIG_BLOCK_DEV_CACHE_SIZE, bsize);
 423         if (r != EOK) {
 424                 ext4_block_fini(bd);
 425                 return r;
 426         }
 427
 428         if (bsize != bc->itemsize)
 429                 return ENOTSUP;
 430
 431         /*Bind block cache to block device*/
 432         r = ext4_block_bind_bcache(bd, bc);
 433         if (r != EOK) {
 434                 ext4_bcache_cleanup(bc);
 435                 ext4_block_fini(bd);
 436                 ext4_bcache_fini_dynamic(bc);
 437                 return r;
 438         }
 439
 440         bd->fs = &mp->fs;
 441         return r;
 442 }
 443
 444
 445 int ext4_umount(const char *mount_point)
 446 {
 447         int i;
 448         int r;
 449         struct ext4_mountpoint *mp = 0;
 450
 451         for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
 452                 if (!strcmp(s_mp[i].name, mount_point)) {
 453                         mp = &s_mp[i];
 454                         break;
 455                 }
 456         }
 457
 458         if (!mp)
 459                 return ENODEV;
 460
 461         r = ext4_fs_fini(&mp->fs);
 462         if (r != EOK)
 463                 goto Finish;
 464
 465         mp->mounted = 0;
 466
 467         ext4_bcache_cleanup(mp->fs.bdev->bc);
 468         ext4_bcache_fini_dynamic(mp->fs.bdev->bc);
 469
 470         r = ext4_block_fini(mp->fs.bdev);
 471 Finish:
 472         mp->fs.bdev->fs = NULL;
 473         return r;
 474 }
 475
 476 static struct ext4_mountpoint *ext4_get_mount(const char *path)
 477 {
 478         for (size_t i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
 479
 480                 if (!s_mp[i].mounted)
 481                         continue;
 482
 483                 if (!strncmp(s_mp[i].name, path, strlen(s_mp[i].name)))
 484                         return &s_mp[i];
 485         }
 486
 487         return NULL;
 488 }
 489
 490 __unused
 491 static int __ext4_journal_start(const char *mount_point)
 492 {
 493         int r = EOK;
 494         struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
 495
 496         if (!mp)
 497                 return ENOENT;
 498
 499         if (mp->fs.read_only)
 500                 return EOK;
 501
 502         if (ext4_sb_feature_com(&mp->fs.sb,
 503                                 EXT4_FCOM_HAS_JOURNAL)) {
 504                 r = jbd_get_fs(&mp->fs, &mp->jbd_fs);
 505                 if (r != EOK)
 506                         goto Finish;
 507
 508                 r = jbd_journal_start(&mp->jbd_fs, &mp->jbd_journal);
 509                 if (r != EOK) {
 510                         mp->jbd_fs.dirty = false;
 511                         jbd_put_fs(&mp->jbd_fs);
 512                         goto Finish;
 513                 }
 514                 mp->fs.jbd_fs = &mp->jbd_fs;
 515                 mp->fs.jbd_journal = &mp->jbd_journal;
 516         }
 517 Finish:
 518         return r;
 519 }
 520
 521 __unused
 522 static int __ext4_journal_stop(const char *mount_point)
 523 {
 524         int r = EOK;
 525         struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
 526
 527         if (!mp)
 528                 return ENOENT;
 529
 530         if (mp->fs.read_only)
 531                 return EOK;
 532
 533         if (ext4_sb_feature_com(&mp->fs.sb,
 534                                 EXT4_FCOM_HAS_JOURNAL)) {
 535                 r = jbd_journal_stop(&mp->jbd_journal);
 536                 if (r != EOK) {
 537                         mp->jbd_fs.dirty = false;
 538                         jbd_put_fs(&mp->jbd_fs);
 539                         mp->fs.jbd_journal = NULL;
 540                         mp->fs.jbd_fs = NULL;
 541                         goto Finish;
 542                 }
 543
 544                 r = jbd_put_fs(&mp->jbd_fs);
 545                 if (r != EOK) {
 546                         mp->fs.jbd_journal = NULL;
 547                         mp->fs.jbd_fs = NULL;
 548                         goto Finish;
 549                 }
 550
 551                 mp->fs.jbd_journal = NULL;
 552                 mp->fs.jbd_fs = NULL;
 553         }
 554 Finish:
 555         return r;
 556 }
 557
 558 __unused
 559 static int __ext4_recover(const char *mount_point)
 560 {
 561         struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
 562         int r = ENOTSUP;
 563
 564         if (!mp)
 565                 return ENOENT;
 566
 567         EXT4_MP_LOCK(mp);
 568         if (ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_HAS_JOURNAL)) {
 569                 struct jbd_fs *jbd_fs = ext4_calloc(1, sizeof(struct jbd_fs));
 570                 if (!jbd_fs) {
 571                          r = ENOMEM;
 572                          goto Finish;
 573                 }
 574
 575                 r = jbd_get_fs(&mp->fs, jbd_fs);
 576                 if (r != EOK) {
 577                         ext4_free(jbd_fs);
 578                         goto Finish;
 579                 }
 580
 581                 r = jbd_recover(jbd_fs);
 582                 jbd_put_fs(jbd_fs);
 583                 ext4_free(jbd_fs);
 584         }
 585         if (r == EOK && !mp->fs.read_only) {
 586                 uint32_t bgid;
 587                 uint64_t free_blocks_count = 0;
 588                 uint32_t free_inodes_count = 0;
 589                 struct ext4_block_group_ref bg_ref;
 590
 591                 /* Update superblock's stats */
 592                 for (bgid = 0;bgid < ext4_block_group_cnt(&mp->fs.sb);bgid++) {
 593                         r = ext4_fs_get_block_group_ref(&mp->fs, bgid, &bg_ref);
 594                         if (r != EOK)
 595                                 goto Finish;
 596
 597                         free_blocks_count +=
 598                                 ext4_bg_get_free_blocks_count(bg_ref.block_group,
 599                                                 &mp->fs.sb);
 600                         free_inodes_count +=
 601                                 ext4_bg_get_free_inodes_count(bg_ref.block_group,
 602                                                 &mp->fs.sb);
 603
 604                         ext4_fs_put_block_group_ref(&bg_ref);
 605                 }
 606                 ext4_sb_set_free_blocks_cnt(&mp->fs.sb, free_blocks_count);
 607                 ext4_set32(&mp->fs.sb, free_inodes_count, free_inodes_count);
 608                 /* We don't need to save the superblock stats immediately. */
 609         }
 610
 611 Finish:
 612         EXT4_MP_UNLOCK(mp);
 613         return r;
 614 }
 615
 616 __unused
 617 static int __ext4_trans_start(struct ext4_mountpoint *mp)
 618 {
 619         int r = EOK;
 620
 621         if (mp->fs.jbd_journal && !mp->fs.curr_trans) {
 622                 struct jbd_journal *journal = mp->fs.jbd_journal;
 623                 struct jbd_trans *trans;
 624                 trans = jbd_journal_new_trans(journal);
 625                 if (!trans) {
 626                         r = ENOMEM;
 627                         goto Finish;
 628                 }
 629                 mp->fs.curr_trans = trans;
 630         }
 631 Finish:
 632         return r;
 633 }
 634
 635 __unused
 636 static int __ext4_trans_stop(struct ext4_mountpoint *mp)
 637 {
 638         int r = EOK;
 639
 640         if (mp->fs.jbd_journal && mp->fs.curr_trans) {
 641                 struct jbd_journal *journal = mp->fs.jbd_journal;
 642                 struct jbd_trans *trans = mp->fs.curr_trans;
 643                 r = jbd_journal_commit_trans(journal, trans);
 644                 mp->fs.curr_trans = NULL;
 645         }
 646         return r;
 647 }
 648
 649 __unused
 650 static void __ext4_trans_abort(struct ext4_mountpoint *mp)
 651 {
 652         if (mp->fs.jbd_journal && mp->fs.curr_trans) {
 653                 struct jbd_journal *journal = mp->fs.jbd_journal;
 654                 struct jbd_trans *trans = mp->fs.curr_trans;
 655                 jbd_journal_free_trans(journal, trans, true);
 656                 mp->fs.curr_trans = NULL;
 657         }
 658 }
 659
 660 int ext4_journal_start(const char *mount_point __unused)
 661 {
 662         int r = EOK;
 663 #if CONFIG_JOURNALING_ENABLE
 664         r = __ext4_journal_start(mount_point);
 665 #endif
 666         return r;
 667 }
 668
 669 int ext4_journal_stop(const char *mount_point __unused)
 670 {
 671         int r = EOK;
 672 #if CONFIG_JOURNALING_ENABLE
 673         r = __ext4_journal_stop(mount_point);
 674 #endif
 675         return r;
 676 }
 677
 678 int ext4_recover(const char *mount_point __unused)
 679 {
 680         int r = EOK;
 681 #if CONFIG_JOURNALING_ENABLE
 682         r = __ext4_recover(mount_point);
 683 #endif
 684         return r;
 685 }
 686
 687 static int ext4_trans_start(struct ext4_mountpoint *mp __unused)
 688 {
 689         int r = EOK;
 690 #if CONFIG_JOURNALING_ENABLE
 691         r = __ext4_trans_start(mp);
 692 #endif
 693         return r;
 694 }
 695
 696 static int ext4_trans_stop(struct ext4_mountpoint *mp __unused)
 697 {
 698         int r = EOK;
 699 #if CONFIG_JOURNALING_ENABLE
 700         r = __ext4_trans_stop(mp);
 701 #endif
 702         return r;
 703 }
 704
 705 static void ext4_trans_abort(struct ext4_mountpoint *mp __unused)
 706 {
 707 #if CONFIG_JOURNALING_ENABLE
 708         __ext4_trans_abort(mp);
 709 #endif
 710 }
 711
 712
 713 int ext4_mount_point_stats(const char *mount_point,
 714                            struct ext4_mount_stats *stats)
 715 {
 716         struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
 717
 718         if (!mp)
 719                 return ENOENT;
 720
 721         EXT4_MP_LOCK(mp);
 722         stats->inodes_count = ext4_get32(&mp->fs.sb, inodes_count);
 723         stats->free_inodes_count = ext4_get32(&mp->fs.sb, free_inodes_count);
 724         stats->blocks_count = ext4_sb_get_blocks_cnt(&mp->fs.sb);
 725         stats->free_blocks_count = ext4_sb_get_free_blocks_cnt(&mp->fs.sb);
 726         stats->block_size = ext4_sb_get_block_size(&mp->fs.sb);
 727
 728         stats->block_group_count = ext4_block_group_cnt(&mp->fs.sb);
 729         stats->blocks_per_group = ext4_get32(&mp->fs.sb, blocks_per_group);
 730         stats->inodes_per_group = ext4_get32(&mp->fs.sb, inodes_per_group);
 731
 732         memcpy(stats->volume_name, mp->fs.sb.volume_name, 16);
 733         EXT4_MP_UNLOCK(mp);
 734
 735         return EOK;
 736 }
 737
 738 int ext4_mount_setup_locks(const char *mount_point,
 739                            const struct ext4_lock *locks)
 740 {
 741         uint32_t i;
 742         struct ext4_mountpoint *mp = 0;
 743
 744         for (i = 0; i < CONFIG_EXT4_MOUNTPOINTS_COUNT; ++i) {
 745                 if (!strcmp(s_mp[i].name, mount_point)) {
 746                         mp = &s_mp[i];
 747                         break;
 748                 }
 749         }
 750         if (!mp)
 751                 return ENOENT;
 752
 753         mp->os_locks = locks;
 754         return EOK;
 755 }
 756
 757 /********************************FILE OPERATIONS*****************************/
 758
 759 static int ext4_path_check(const char *path, bool *is_goal)
 760 {
 761         int i;
 762
 763         for (i = 0; i < EXT4_DIRECTORY_FILENAME_LEN; ++i) {
 764
 765                 if (path[i] == '/') {
 766                         *is_goal = false;
 767                         return i;
 768                 }
 769
 770                 if (path[i] == 0) {
 771                         *is_goal = true;
 772                         return i;
 773                 }
 774         }
 775
 776         return 0;
 777 }
 778
 779 static bool ext4_parse_flags(const char *flags, uint32_t *file_flags)
 780 {
 781         if (!flags)
 782                 return false;
 783
 784         if (!strcmp(flags, "r") || !strcmp(flags, "rb")) {
 785                 *file_flags = O_RDONLY;
 786                 return true;
 787         }
 788
 789         if (!strcmp(flags, "w") || !strcmp(flags, "wb")) {
 790                 *file_flags = O_WRONLY | O_CREAT | O_TRUNC;
 791                 return true;
 792         }
 793
 794         if (!strcmp(flags, "a") || !strcmp(flags, "ab")) {
 795                 *file_flags = O_WRONLY | O_CREAT | O_APPEND;
 796                 return true;
 797         }
 798
 799         if (!strcmp(flags, "r+") || !strcmp(flags, "rb+") ||
 800             !strcmp(flags, "r+b")) {
 801                 *file_flags = O_RDWR;
 802                 return true;
 803         }
 804
 805         if (!strcmp(flags, "w+") || !strcmp(flags, "wb+") ||
 806             !strcmp(flags, "w+b")) {
 807                 *file_flags = O_RDWR | O_CREAT | O_TRUNC;
 808                 return true;
 809         }
 810
 811         if (!strcmp(flags, "a+") || !strcmp(flags, "ab+") ||
 812             !strcmp(flags, "a+b")) {
 813                 *file_flags = O_RDWR | O_CREAT | O_APPEND;
 814                 return true;
 815         }
 816
 817         return false;
 818 }
 819
 820 static int ext4_trunc_inode(struct ext4_mountpoint *mp,
 821                             uint32_t index, uint64_t new_size)
 822 {
 823         int r = EOK;
 824         struct ext4_fs *const fs = &mp->fs;
 825         struct ext4_inode_ref inode_ref;
 826         uint64_t inode_size;
 827         bool has_trans = mp->fs.jbd_journal && mp->fs.curr_trans;
 828         r = ext4_fs_get_inode_ref(fs, index, &inode_ref);
 829         if (r != EOK)
 830                 return r;
 831
 832         inode_size = ext4_inode_get_size(&fs->sb, inode_ref.inode);
 833         ext4_fs_put_inode_ref(&inode_ref);
 834         if (has_trans)
 835                 ext4_trans_stop(mp);
 836
 837         while (inode_size > new_size + CONFIG_MAX_TRUNCATE_SIZE) {
 838
 839                 inode_size -= CONFIG_MAX_TRUNCATE_SIZE;
 840
 841                 ext4_trans_start(mp);
 842                 r = ext4_fs_get_inode_ref(fs, index, &inode_ref);
 843                 if (r != EOK) {
 844                         ext4_trans_abort(mp);
 845                         break;
 846                 }
 847                 r = ext4_fs_truncate_inode(&inode_ref, inode_size);
 848                 if (r != EOK)
 849                         ext4_fs_put_inode_ref(&inode_ref);
 850                 else
 851                         r = ext4_fs_put_inode_ref(&inode_ref);
 852
 853                 if (r != EOK) {
 854                         ext4_trans_abort(mp);
 855                         goto Finish;
 856                 } else
 857                         ext4_trans_stop(mp);
 858         }
 859
 860         if (inode_size > new_size) {
 861
 862                 inode_size = new_size;
 863
 864                 ext4_trans_start(mp);
 865                 r = ext4_fs_get_inode_ref(fs, index, &inode_ref);
 866                 if (r != EOK) {
 867                         ext4_trans_abort(mp);
 868                         goto Finish;
 869                 }
 870                 r = ext4_fs_truncate_inode(&inode_ref, inode_size);
 871                 if (r != EOK)
 872                         ext4_fs_put_inode_ref(&inode_ref);
 873                 else
 874                         r = ext4_fs_put_inode_ref(&inode_ref);
 875
 876                 if (r != EOK)
 877                         ext4_trans_abort(mp);
 878                 else
 879                         ext4_trans_stop(mp);
 880
 881         }
 882
 883 Finish:
 884
 885         if (has_trans)
 886                 ext4_trans_start(mp);
 887
 888         return r;
 889 }
 890
 891 static int ext4_trunc_dir(struct ext4_mountpoint *mp,
 892                           struct ext4_inode_ref *parent,
 893                           struct ext4_inode_ref *dir)
 894 {
 895         int r = EOK;
 896         bool is_dir = ext4_inode_is_type(&mp->fs.sb, dir->inode,
 897                         EXT4_INODE_MODE_DIRECTORY);
 898         uint32_t block_size = ext4_sb_get_block_size(&mp->fs.sb);
 899         if (!is_dir)
 900                 return EINVAL;
 901
 902 #if CONFIG_DIR_INDEX_ENABLE
 903         /* Initialize directory index if supported */
 904         if (ext4_sb_feature_com(&mp->fs.sb, EXT4_FCOM_DIR_INDEX)) {
 905                 r = ext4_dir_dx_init(dir, parent);
 906                 if (r != EOK)
 907                         return r;
 908
 909                 r = ext4_trunc_inode(mp, dir->index,
 910                                      EXT4_DIR_DX_INIT_BCNT * block_size);
 911                 if (r != EOK)
 912                         return r;
 913         } else
 914 #endif
 915         {
 916                 r = ext4_trunc_inode(mp, dir->index, block_size);
 917                 if (r != EOK)
 918                         return r;
 919         }
 920
 921         return ext4_fs_truncate_inode(dir, 0);
 922 }
 923
 924 /*
 925  * NOTICE: if filetype is equal to EXT4_DIRENTRY_UNKNOWN,
 926  * any filetype of the target dir entry will be accepted.
 927  */
 928 static int ext4_generic_open2(ext4_file *f, const char *path, int flags,
 929                               int ftype, uint32_t *parent_inode,
 930                               uint32_t *name_off)
 931 {
 932         bool is_goal = false;
 933         uint32_t imode = EXT4_INODE_MODE_DIRECTORY;
 934         uint32_t next_inode;
 935
 936         int r;
 937         int len;
 938         struct ext4_mountpoint *mp = ext4_get_mount(path);
 939         struct ext4_dir_search_result result;
 940         struct ext4_inode_ref ref;
 941
 942         f->mp = 0;
 943
 944         if (!mp)
 945                 return ENOENT;
 946
 947         struct ext4_fs *const fs = &mp->fs;
 948         struct ext4_sblock *const sb = &mp->fs.sb;
 949
 950         if (fs->read_only && flags & O_CREAT)
 951                 return EROFS;
 952
 953         f->flags = flags;
 954
 955         /*Skip mount point*/
 956         path += strlen(mp->name);
 957
 958         if (name_off)
 959                 *name_off = strlen(mp->name);
 960
 961         /*Load root*/
 962         r = ext4_fs_get_inode_ref(fs, EXT4_INODE_ROOT_INDEX, &ref);
 963         if (r != EOK)
 964                 return r;
 965
 966         if (parent_inode)
 967                 *parent_inode = ref.index;
 968
 969         if (flags & O_CREAT)
 970                 ext4_trans_start(mp);
 971
 972         len = ext4_path_check(path, &is_goal);
 973         while (1) {
 974
 975                 len = ext4_path_check(path, &is_goal);
 976                 if (!len) {
 977                         /*If root open was request.*/
 978                         if (ftype == EXT4_DE_DIR || ftype == EXT4_DE_UNKNOWN)
 979                                 if (is_goal)
 980                                         break;
 981
 982                         r = ENOENT;
 983                         break;
 984                 }
 985
 986                 r = ext4_dir_find_entry(&result, &ref, path, len);
 987                 if (r != EOK) {
 988
 989                         /*Destroy last result*/
 990                         ext4_dir_destroy_result(&ref, &result);
 991                         if (r != ENOENT)
 992                                 break;
 993
 994                         if (!(f->flags & O_CREAT))
 995                                 break;
 996
 997                         /*O_CREAT allows create new entry*/
 998                         struct ext4_inode_ref child_ref;
 999                         r = ext4_fs_alloc_inode(fs, &child_ref,
1000                                         is_goal ? ftype : EXT4_DE_DIR);
1001                         if (r != EOK)
1002                                 break;
1003
1004
1005                         /*Link with root dir.*/
1006                         r = ext4_link(mp, &ref, &child_ref, path, len, false);
1007                         if (r != EOK) {
1008                                 /*Fail. Free new inode.*/
1009                                 ext4_fs_free_inode(&child_ref);
1010                                 /*We do not want to write new inode.
1011                                   But block has to be released.*/
1012                                 child_ref.dirty = false;
1013                                 ext4_fs_put_inode_ref(&child_ref);
1014                                 break;
1015                         }
1016
1017                         ext4_fs_put_inode_ref(&child_ref);
1018                         continue;
1019                 }
1020
1021                 if (parent_inode)
1022                         *parent_inode = ref.index;
1023
1024                 next_inode = ext4_dir_en_get_inode(result.dentry);
1025                 if (ext4_sb_feature_incom(sb, EXT4_FINCOM_FILETYPE)) {
1026                         uint8_t t;
1027                         t = ext4_dir_en_get_inode_type(sb, result.dentry);
1028                         imode = ext4_fs_correspond_inode_mode(t);
1029                 } else {
1030                         struct ext4_inode_ref child_ref;
1031                         r = ext4_fs_get_inode_ref(fs, next_inode, &child_ref);
1032                         if (r != EOK)
1033                                 break;
1034
1035                         imode = ext4_inode_type(sb, child_ref.inode);
1036                         ext4_fs_put_inode_ref(&child_ref);
1037                 }
1038
1039                 r = ext4_dir_destroy_result(&ref, &result);
1040                 if (r != EOK)
1041                         break;
1042
1043                 /*If expected file error*/
1044                 if (imode != EXT4_INODE_MODE_DIRECTORY && !is_goal) {
1045                         r = ENOENT;
1046                         break;
1047                 }
1048                 if (ftype != EXT4_DE_UNKNOWN) {
1049                         bool df = imode != ext4_fs_correspond_inode_mode(ftype);
1050                         if (df && is_goal) {
1051                                 r = ENOENT;
1052                                 break;
1053                         }
1054                 }
1055
1056                 r = ext4_fs_put_inode_ref(&ref);
1057                 if (r != EOK)
1058                         break;
1059
1060                 r = ext4_fs_get_inode_ref(fs, next_inode, &ref);
1061                 if (r != EOK)
1062                         break;
1063
1064                 if (is_goal)
1065                         break;
1066
1067                 path += len + 1;
1068
1069                 if (name_off)
1070                         *name_off += len + 1;
1071         };
1072
1073         if (r != EOK) {
1074                 ext4_fs_put_inode_ref(&ref);
1075                 return r;
1076         }
1077
1078         if (is_goal) {
1079
1080                 if ((f->flags & O_TRUNC) && (imode == EXT4_INODE_MODE_FILE)) {
1081                         r = ext4_trunc_inode(mp, ref.index, 0);
1082                         if (r != EOK) {
1083                                 ext4_fs_put_inode_ref(&ref);
1084                                 return r;
1085                         }
1086                 }
1087
1088                 f->mp = mp;
1089                 f->fsize = ext4_inode_get_size(sb, ref.inode);
1090                 f->inode = ref.index;
1091                 f->fpos = 0;
1092
1093                 if (f->flags & O_APPEND)
1094                         f->fpos = f->fsize;
1095
1096         }
1097
1098         r = ext4_fs_put_inode_ref(&ref);
1099         if (flags & O_CREAT) {
1100                 if (r == EOK)
1101                         ext4_trans_stop(mp);
1102                 else
1103                         ext4_trans_abort(mp);
1104
1105         }
1106
1107         return r;
1108 }
1109
1110 /****************************************************************************/
1111
1112 static int ext4_generic_open(ext4_file *f, const char *path, const char *flags,
1113                              bool file_expect, uint32_t *parent_inode,
1114                              uint32_t *name_off)
1115 {
1116         uint32_t iflags;
1117         int filetype;
1118         if (ext4_parse_flags(flags, &iflags) == false)
1119                 return EINVAL;
1120
1121         if (file_expect == true)
1122                 filetype = EXT4_DE_REG_FILE;
1123         else
1124                 filetype = EXT4_DE_DIR;
1125
1126         return ext4_generic_open2(f, path, iflags, filetype, parent_inode,
1127                                   name_off);
1128 }
1129
1130 static int ext4_create_hardlink(const char *path,
1131                 struct ext4_inode_ref *child_ref, bool rename)
1132 {
1133         bool is_goal = false;
1134         uint32_t inode_mode = EXT4_INODE_MODE_DIRECTORY;
1135         uint32_t next_inode;
1136
1137         int r;
1138         int len;
1139         struct ext4_mountpoint *mp = ext4_get_mount(path);
1140         struct ext4_dir_search_result result;
1141         struct ext4_inode_ref ref;
1142
1143         if (!mp)
1144                 return ENOENT;
1145
1146         struct ext4_fs *const fs = &mp->fs;
1147         struct ext4_sblock *const sb = &mp->fs.sb;
1148
1149         /*Skip mount point*/
1150         path += strlen(mp->name);
1151
1152         /*Load root*/
1153         r = ext4_fs_get_inode_ref(fs, EXT4_INODE_ROOT_INDEX, &ref);
1154         if (r != EOK)
1155                 return r;
1156
1157         len = ext4_path_check(path, &is_goal);
1158         while (1) {
1159
1160                 len = ext4_path_check(path, &is_goal);
1161                 if (!len) {
1162                         /*If root open was request.*/
1163                         r = is_goal ? EINVAL : ENOENT;
1164                         break;
1165                 }
1166
1167                 r = ext4_dir_find_entry(&result, &ref, path, len);
1168                 if (r != EOK) {
1169
1170                         /*Destroy last result*/
1171                         ext4_dir_destroy_result(&ref, &result);
1172
1173                         if (r != ENOENT || !is_goal)
1174                                 break;
1175
1176                         /*Link with root dir.*/
1177                         r = ext4_link(mp, &ref, child_ref, path, len, rename);
1178                         break;
1179                 } else if (r == EOK && is_goal) {
1180                         /*Destroy last result*/
1181                         ext4_dir_destroy_result(&ref, &result);
1182                         r = EEXIST;
1183                         break;
1184                 }
1185
1186                 next_inode = result.dentry->inode;
1187                 if (ext4_sb_feature_incom(sb, EXT4_FINCOM_FILETYPE)) {
1188                         uint8_t t;
1189                         t = ext4_dir_en_get_inode_type(sb, result.dentry);
1190                         inode_mode = ext4_fs_correspond_inode_mode(t);
1191                 } else {
1192                         struct ext4_inode_ref child_ref;
1193                         r = ext4_fs_get_inode_ref(fs, next_inode, &child_ref);
1194                         if (r != EOK)
1195                                 break;
1196
1197                         inode_mode = ext4_inode_type(sb, child_ref.inode);
1198                         ext4_fs_put_inode_ref(&child_ref);
1199                 }
1200
1201                 r = ext4_dir_destroy_result(&ref, &result);
1202                 if (r != EOK)
1203                         break;
1204
1205                 if (inode_mode != EXT4_INODE_MODE_DIRECTORY) {
1206                         r = is_goal ? EEXIST : ENOENT;
1207                         break;
1208                 }
1209
1210                 r = ext4_fs_put_inode_ref(&ref);
1211                 if (r != EOK)
1212                         break;
1213
1214                 r = ext4_fs_get_inode_ref(fs, next_inode, &ref);
1215                 if (r != EOK)
1216                         break;
1217
1218                 if (is_goal)
1219                         break;
1220
1221                 path += len + 1;
1222         };
1223
1224         if (r != EOK) {
1225                 ext4_fs_put_inode_ref(&ref);
1226                 return r;
1227         }
1228
1229         r = ext4_fs_put_inode_ref(&ref);
1230         return r;
1231 }
1232
1233 static int ext4_remove_orig_reference(const char *path, uint32_t name_off,
1234                                       struct ext4_inode_ref *parent_ref,
1235                                       struct ext4_inode_ref *child_ref)
1236 {
1237         bool is_goal;
1238         int r;
1239         int len;
1240         struct ext4_mountpoint *mp = ext4_get_mount(path);
1241
1242         if (!mp)
1243                 return ENOENT;
1244
1245         /*Set path*/
1246         path += name_off;
1247
1248         len = ext4_path_check(path, &is_goal);
1249
1250         /* Remove entry from parent directory */
1251         r = ext4_dir_remove_entry(parent_ref, path, len);
1252         if (r != EOK)
1253                 goto Finish;
1254
1255         if (ext4_inode_is_type(&mp->fs.sb, child_ref->inode,
1256                                EXT4_INODE_MODE_DIRECTORY)) {
1257                 ext4_fs_inode_links_count_dec(parent_ref);
1258                 parent_ref->dirty = true;
1259         }
1260 Finish:
1261         return r;
1262 }
1263
1264 int ext4_flink(const char *path, const char *hardlink_path)
1265 {
1266         int r;
1267         ext4_file f;
1268         uint32_t name_off;
1269         bool child_loaded = false;
1270         uint32_t parent_inode, child_inode;
1271         struct ext4_mountpoint *mp = ext4_get_mount(path);
1272         struct ext4_mountpoint *target_mp = ext4_get_mount(hardlink_path);
1273         struct ext4_inode_ref child_ref;
1274
1275         if (!mp)
1276                 return ENOENT;
1277
1278         if (mp->fs.read_only)
1279                 return EROFS;
1280
1281         /* Will that happen? Anyway return EINVAL for such case. */
1282         if (mp != target_mp)
1283                 return EINVAL;
1284
1285         EXT4_MP_LOCK(mp);
1286         ext4_trans_start(mp);
1287
1288         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN,
1289                                &parent_inode, &name_off);
1290         if (r != EOK)
1291                 goto Finish;
1292
1293         child_inode = f.inode;
1294         ext4_fclose(&f);
1295
1296         /*We have file to unlink. Load it.*/
1297         r = ext4_fs_get_inode_ref(&mp->fs, child_inode, &child_ref);
1298         if (r != EOK)
1299                 goto Finish;
1300
1301         child_loaded = true;
1302
1303         /* Creating hardlink for directory is not allowed. */
1304         if (ext4_inode_is_type(&mp->fs.sb, child_ref.inode,
1305                                EXT4_INODE_MODE_DIRECTORY)) {
1306                 r = EINVAL;
1307                 goto Finish;
1308         }
1309
1310         r = ext4_create_hardlink(hardlink_path, &child_ref, false);
1311
1312 Finish:
1313         if (child_loaded)
1314                 ext4_fs_put_inode_ref(&child_ref);
1315
1316         if (r != EOK)
1317                 ext4_trans_abort(mp);
1318         else
1319                 ext4_trans_stop(mp);
1320
1321         EXT4_MP_UNLOCK(mp);
1322         return r;
1323
1324 }
1325
1326 int ext4_frename(const char *path, const char *new_path)
1327 {
1328         int r;
1329         ext4_file f;
1330         uint32_t name_off;
1331         bool parent_loaded = false, child_loaded = false;
1332         uint32_t parent_inode, child_inode;
1333         struct ext4_mountpoint *mp = ext4_get_mount(path);
1334         struct ext4_inode_ref child_ref, parent_ref;
1335
1336         if (!mp)
1337                 return ENOENT;
1338
1339         if (mp->fs.read_only)
1340                 return EROFS;
1341
1342         EXT4_MP_LOCK(mp);
1343         ext4_trans_start(mp);
1344
1345         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN,
1346                                 &parent_inode, &name_off);
1347         if (r != EOK)
1348                 goto Finish;
1349
1350         child_inode = f.inode;
1351         ext4_fclose(&f);
1352
1353         /*Load parent*/
1354         r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent_ref);
1355         if (r != EOK)
1356                 goto Finish;
1357
1358         parent_loaded = true;
1359
1360         /*We have file to unlink. Load it.*/
1361         r = ext4_fs_get_inode_ref(&mp->fs, child_inode, &child_ref);
1362         if (r != EOK)
1363                 goto Finish;
1364
1365         child_loaded = true;
1366
1367         r = ext4_create_hardlink(new_path, &child_ref, true);
1368         if (r != EOK)
1369                 goto Finish;
1370
1371         r = ext4_remove_orig_reference(path, name_off, &parent_ref, &child_ref);
1372         if (r != EOK)
1373                 goto Finish;
1374
1375 Finish:
1376         if (parent_loaded)
1377                 ext4_fs_put_inode_ref(&parent_ref);
1378
1379         if (child_loaded)
1380                 ext4_fs_put_inode_ref(&child_ref);
1381
1382         if (r != EOK)
1383                 ext4_trans_abort(mp);
1384         else
1385                 ext4_trans_stop(mp);
1386
1387         EXT4_MP_UNLOCK(mp);
1388         return r;
1389
1390 }
1391
1392 /****************************************************************************/
1393
1394 int ext4_get_sblock(const char *mount_point, struct ext4_sblock **sb)
1395 {
1396         struct ext4_mountpoint *mp = ext4_get_mount(mount_point);
1397
1398         if (!mp)
1399                 return ENOENT;
1400
1401         *sb = &mp->fs.sb;
1402         return EOK;
1403 }
1404
1405 int ext4_cache_write_back(const char *path, bool on)
1406 {
1407         struct ext4_mountpoint *mp = ext4_get_mount(path);
1408         int ret;
1409
1410         if (!mp)
1411                 return ENOENT;
1412
1413         EXT4_MP_LOCK(mp);
1414         ret = ext4_block_cache_write_back(mp->fs.bdev, on);
1415         EXT4_MP_UNLOCK(mp);
1416         return ret;
1417 }
1418
1419 int ext4_cache_flush(const char *path)
1420 {
1421         struct ext4_mountpoint *mp = ext4_get_mount(path);
1422         int ret;
1423
1424         if (!mp)
1425                 return ENOENT;
1426
1427         EXT4_MP_LOCK(mp);
1428         ret = ext4_block_cache_flush(mp->fs.bdev);
1429         EXT4_MP_UNLOCK(mp);
1430         return ret;
1431 }
1432
1433 int ext4_fremove(const char *path)
1434 {
1435         ext4_file f;
1436         uint32_t parent_inode;
1437         uint32_t name_off;
1438         bool is_goal;
1439         int r;
1440         int len;
1441         struct ext4_inode_ref child;
1442         struct ext4_inode_ref parent;
1443         struct ext4_mountpoint *mp = ext4_get_mount(path);
1444
1445         if (!mp)
1446                 return ENOENT;
1447
1448         if (mp->fs.read_only)
1449                 return EROFS;
1450
1451         EXT4_MP_LOCK(mp);
1452         ext4_trans_start(mp);
1453
1454         r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN,
1455                                &parent_inode, &name_off);
1456         if (r != EOK) {
1457                 ext4_trans_abort(mp);
1458                 EXT4_MP_UNLOCK(mp);
1459                 return r;
1460         }
1461
1462         /*Load parent*/
1463         r = ext4_fs_get_inode_ref(&mp->fs, parent_inode, &parent);
1464         if (r != EOK) {
1465                 ext4_trans_abort(mp);
1466                 EXT4_MP_UNLOCK(mp);
1467                 return r;
1468         }
1469
1470         /*We have file to delete. Load it.*/
1471         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &child);
1472         if (r != EOK) {
1473                 ext4_fs_put_inode_ref(&parent);
1474                 ext4_trans_abort(mp);
1475                 EXT4_MP_UNLOCK(mp);
1476                 return r;
1477         }
1478         /* We do not allow opening files here. */
1479         if (ext4_inode_type(&mp->fs.sb, child.inode) ==
1480             EXT4_INODE_MODE_DIRECTORY) {
1481                 ext4_fs_put_inode_ref(&parent);
1482                 ext4_fs_put_inode_ref(&child);
1483                 ext4_trans_abort(mp);
1484                 EXT4_MP_UNLOCK(mp);
1485                 return r;
1486         }
1487
1488         /*Link count will be zero, the inode should be freed. */
1489         if (ext4_inode_get_links_cnt(child.inode) == 1) {
1490                 ext4_block_cache_write_back(mp->fs.bdev, 1);
1491                 r = ext4_trunc_inode(mp, child.index, 0);
1492                 if (r != EOK) {
1493                         ext4_fs_put_inode_ref(&parent);
1494                         ext4_fs_put_inode_ref(&child);
1495                         ext4_trans_abort(mp);
1496                         EXT4_MP_UNLOCK(mp);
1497                         return r;
1498                 }
1499                 ext4_block_cache_write_back(mp->fs.bdev, 0);
1500         }
1501
1502         /*Set path*/
1503         path += name_off;
1504
1505         len = ext4_path_check(path, &is_goal);
1506
1507         /*Unlink from parent*/
1508         r = ext4_unlink(mp, &parent, &child, path, len);
1509         if (r != EOK)
1510                 goto Finish;
1511
1512         /*Link count is zero, the inode should be freed. */
1513         if (!ext4_inode_get_links_cnt(child.inode)) {
1514                 ext4_inode_set_del_time(child.inode, -1L);
1515
1516                 r = ext4_fs_free_inode(&child);
1517                 if (r != EOK)
1518                         goto Finish;
1519         }
1520
1521 Finish:
1522         ext4_fs_put_inode_ref(&child);
1523         ext4_fs_put_inode_ref(&parent);
1524
1525         if (r != EOK)
1526                 ext4_trans_abort(mp);
1527         else
1528                 ext4_trans_stop(mp);
1529
1530         EXT4_MP_UNLOCK(mp);
1531         return r;
1532 }
1533
1534 int ext4_fopen(ext4_file *file, const char *path, const char *flags)
1535 {
1536         struct ext4_mountpoint *mp = ext4_get_mount(path);
1537         int r;
1538
1539         if (!mp)
1540                 return ENOENT;
1541
1542         EXT4_MP_LOCK(mp);
1543
1544         ext4_block_cache_write_back(mp->fs.bdev, 1);
1545         r = ext4_generic_open(file, path, flags, true, 0, 0);
1546         ext4_block_cache_write_back(mp->fs.bdev, 0);
1547
1548         EXT4_MP_UNLOCK(mp);
1549         return r;
1550 }
1551
1552 int ext4_fopen2(ext4_file *file, const char *path, int flags)
1553 {
1554         struct ext4_mountpoint *mp = ext4_get_mount(path);
1555         int r;
1556         int filetype;
1557
1558         if (!mp)
1559                 return ENOENT;
1560
1561         filetype = EXT4_DE_REG_FILE;
1562
1563         EXT4_MP_LOCK(mp);
1564
1565         ext4_block_cache_write_back(mp->fs.bdev, 1);
1566         r = ext4_generic_open2(file, path, flags, filetype, NULL, NULL);
1567         ext4_block_cache_write_back(mp->fs.bdev, 0);
1568
1569         EXT4_MP_UNLOCK(mp);
1570         return r;
1571 }
1572
1573 int ext4_fclose(ext4_file *file)
1574 {
1575         ext4_assert(file && file->mp);
1576
1577         file->mp = 0;
1578         file->flags = 0;
1579         file->inode = 0;
1580         file->fpos = file->fsize = 0;
1581
1582         return EOK;
1583 }
1584
1585 static int ext4_ftruncate_no_lock(ext4_file *file, uint64_t size)
1586 {
1587         struct ext4_inode_ref ref;
1588         int r;
1589
1590
1591         r = ext4_fs_get_inode_ref(&file->mp->fs, file->inode, &ref);
1592         if (r != EOK) {
1593                 EXT4_MP_UNLOCK(file->mp);
1594                 return r;
1595         }
1596
1597         /*Sync file size*/
1598         file->fsize = ext4_inode_get_size(&file->mp->fs.sb, ref.inode);
1599         if (file->fsize <= size) {
1600                 r = EOK;
1601                 goto Finish;
1602         }
1603
1604         /*Start write back cache mode.*/
1605         r = ext4_block_cache_write_back(file->mp->fs.bdev, 1);
1606         if (r != EOK)
1607                 goto Finish;
1608
1609         r = ext4_trunc_inode(file->mp, ref.index, size);
1610         if (r != EOK)
1611                 goto Finish;
1612
1613         file->fsize = size;
1614         if (file->fpos > size)
1615                 file->fpos = size;
1616
1617         /*Stop write back cache mode*/
1618         ext4_block_cache_write_back(file->mp->fs.bdev, 0);
1619
1620         if (r != EOK)
1621                 goto Finish;
1622
1623 Finish:
1624         ext4_fs_put_inode_ref(&ref);
1625         return r;
1626
1627 }
1628
1629 int ext4_ftruncate(ext4_file *f, uint64_t size)
1630 {
1631         int r;
1632         ext4_assert(f && f->mp);
1633
1634         if (f->mp->fs.read_only)
1635                 return EROFS;
1636
1637         if (f->flags & O_RDONLY)
1638                 return EPERM;
1639
1640         EXT4_MP_LOCK(f->mp);
1641
1642         ext4_trans_start(f->mp);
1643         r = ext4_ftruncate_no_lock(f, size);
1644         if (r != EOK)
1645                 ext4_trans_abort(f->mp);
1646         else
1647                 ext4_trans_stop(f->mp);
1648
1649         EXT4_MP_UNLOCK(f->mp);
1650         return r;
1651 }
1652
1653 int ext4_fread(ext4_file *file, void *buf, size_t size, size_t *rcnt)
1654 {
1655         uint32_t unalg;
1656         uint32_t iblock_idx;
1657         uint32_t iblock_last;
1658         uint32_t block_size;
1659
1660         ext4_fsblk_t fblock;
1661         ext4_fsblk_t fblock_start;
1662         uint32_t fblock_count;
1663
1664         uint8_t *u8_buf = buf;
1665         int r;
1666         struct ext4_inode_ref ref;
1667
1668         ext4_assert(file && file->mp);
1669
1670         if (file->flags & O_WRONLY)
1671                 return EPERM;
1672
1673         if (!size)
1674                 return EOK;
1675
1676         EXT4_MP_LOCK(file->mp);
1677
1678         struct ext4_fs *const fs = &file->mp->fs;
1679         struct ext4_sblock *const sb = &file->mp->fs.sb;
1680
1681         if (rcnt)
1682                 *rcnt = 0;
1683
1684         r = ext4_fs_get_inode_ref(fs, file->inode, &ref);
1685         if (r != EOK) {
1686                 EXT4_MP_UNLOCK(file->mp);
1687                 return r;
1688         }
1689
1690         /*Sync file size*/
1691         file->fsize = ext4_inode_get_size(sb, ref.inode);
1692
1693         block_size = ext4_sb_get_block_size(sb);
1694         size = ((uint64_t)size > (file->fsize - file->fpos))
1695                 ? ((size_t)(file->fsize - file->fpos)) : size;
1696
1697         iblock_idx = (uint32_t)((file->fpos) / block_size);
1698         iblock_last = (uint32_t)((file->fpos + size) / block_size);
1699         unalg = (file->fpos) % block_size;
1700
1701         /*If the size of symlink is smaller than 60 bytes*/
1702         bool softlink;
1703         softlink = ext4_inode_is_type(sb, ref.inode, EXT4_INODE_MODE_SOFTLINK);
1704         if (softlink && file->fsize < sizeof(ref.inode->blocks)
1705                      && !ext4_inode_get_blocks_count(sb, ref.inode)) {
1706
1707                 char *content = (char *)ref.inode->blocks;
1708                 if (file->fpos < file->fsize) {
1709                         size_t len = size;
1710                         if (unalg + size > (uint32_t)file->fsize)
1711                                 len = (uint32_t)file->fsize - unalg;
1712                         memcpy(buf, content + unalg, len);
1713                         if (rcnt)
1714                                 *rcnt = len;
1715
1716                 }
1717
1718                 r = EOK;
1719                 goto Finish;
1720         }
1721
1722         if (unalg) {
1723                 size_t len =  size;
1724                 if (size > (block_size - unalg))
1725                         len = block_size - unalg;
1726
1727                 r = ext4_fs_get_inode_dblk_idx(&ref, iblock_idx, &fblock, true);
1728                 if (r != EOK)
1729                         goto Finish;
1730
1731                 /* Do we get an unwritten range? */
1732                 if (fblock != 0) {
1733                         uint64_t off = fblock * block_size + unalg;
1734                         r = ext4_block_readbytes(file->mp->fs.bdev, off, u8_buf, len);
1735                         if (r != EOK)
1736                                 goto Finish;
1737
1738                 } else {
1739                         /* Yes, we do. */
1740                         memset(u8_buf, 0, len);
1741                 }
1742
1743                 u8_buf += len;
1744                 size -= len;
1745                 file->fpos += len;
1746
1747                 if (rcnt)
1748                         *rcnt += len;
1749
1750                 iblock_idx++;
1751         }
1752
1753         fblock_start = 0;
1754         fblock_count = 0;
1755         while (size >= block_size) {
1756                 while (iblock_idx < iblock_last) {
1757                         r = ext4_fs_get_inode_dblk_idx(&ref, iblock_idx,
1758                                                        &fblock, true);
1759                         if (r != EOK)
1760                                 goto Finish;
1761
1762                         iblock_idx++;
1763
1764                         if (!fblock_start)
1765                                 fblock_start = fblock;
1766
1767                         if ((fblock_start + fblock_count) != fblock)
1768                                 break;
1769
1770                         fblock_count++;
1771                 }
1772
1773                 r = ext4_blocks_get_direct(file->mp->fs.bdev, u8_buf, fblock_start,
1774                                            fblock_count);
1775                 if (r != EOK)
1776                         goto Finish;
1777
1778                 size -= block_size * fblock_count;
1779                 u8_buf += block_size * fblock_count;
1780                 file->fpos += block_size * fblock_count;
1781
1782                 if (rcnt)
1783                         *rcnt += block_size * fblock_count;
1784
1785                 fblock_start = fblock;
1786                 fblock_count = 1;
1787         }
1788
1789         if (size) {
1790                 uint64_t off;
1791                 r = ext4_fs_get_inode_dblk_idx(&ref, iblock_idx, &fblock, true);
1792                 if (r != EOK)
1793                         goto Finish;
1794
1795                 off = fblock * block_size;
1796                 r = ext4_block_readbytes(file->mp->fs.bdev, off, u8_buf, size);
1797                 if (r != EOK)
1798                         goto Finish;
1799
1800                 file->fpos += size;
1801
1802                 if (rcnt)
1803                         *rcnt += size;
1804         }
1805
1806 Finish:
1807         ext4_fs_put_inode_ref(&ref);
1808         EXT4_MP_UNLOCK(file->mp);
1809         return r;
1810 }
1811
1812 int ext4_fwrite(ext4_file *file, const void *buf, size_t size, size_t *wcnt)
1813 {
1814         uint32_t unalg;
1815         uint32_t iblk_idx;
1816         uint32_t iblock_last;
1817         uint32_t ifile_blocks;
1818         uint32_t block_size;
1819
1820         uint32_t fblock_count;
1821         ext4_fsblk_t fblk;
1822         ext4_fsblk_t fblock_start;
1823
1824         struct ext4_inode_ref ref;
1825         const uint8_t *u8_buf = buf;
1826         int r, rr = EOK;
1827
1828         ext4_assert(file && file->mp);
1829
1830         if (file->mp->fs.read_only)
1831                 return EROFS;
1832
1833         if (file->flags & O_RDONLY)
1834                 return EPERM;
1835
1836         if (!size)
1837                 return EOK;
1838
1839         EXT4_MP_LOCK(file->mp);
1840         ext4_trans_start(file->mp);
1841
1842         struct ext4_fs *const fs = &file->mp->fs;
1843         struct ext4_sblock *const sb = &file->mp->fs.sb;
1844
1845         if (wcnt)
1846                 *wcnt = 0;
1847
1848         r = ext4_fs_get_inode_ref(fs, file->inode, &ref);
1849         if (r != EOK) {
1850                 ext4_trans_abort(file->mp);
1851                 EXT4_MP_UNLOCK(file->mp);
1852                 return r;
1853         }
1854
1855         /*Sync file size*/
1856         file->fsize = ext4_inode_get_size(sb, ref.inode);
1857         block_size = ext4_sb_get_block_size(sb);
1858
1859         iblock_last = (uint32_t)((file->fpos + size) / block_size);
1860         iblk_idx = (uint32_t)(file->fpos / block_size);
1861         ifile_blocks = (uint32_t)((file->fsize + block_size - 1) / block_size);
1862
1863         unalg = (file->fpos) % block_size;
1864
1865         if (unalg) {
1866                 size_t len =  size;
1867                 uint64_t off;
1868                 if (size > (block_size - unalg))
1869                         len = block_size - unalg;
1870
1871                 r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx, &fblk);
1872                 if (r != EOK)
1873                         goto Finish;
1874
1875                 off = fblk * block_size + unalg;
1876                 r = ext4_block_writebytes(file->mp->fs.bdev, off, u8_buf, len);
1877                 if (r != EOK)
1878                         goto Finish;
1879
1880                 u8_buf += len;
1881                 size -= len;
1882                 file->fpos += len;
1883
1884                 if (wcnt)
1885                         *wcnt += len;
1886
1887                 iblk_idx++;
1888         }
1889
1890         /*Start write back cache mode.*/
1891         r = ext4_block_cache_write_back(file->mp->fs.bdev, 1);
1892         if (r != EOK)
1893                 goto Finish;
1894
1895         fblock_start = 0;
1896         fblock_count = 0;
1897         while (size >= block_size) {
1898
1899                 while (iblk_idx < iblock_last) {
1900                         if (iblk_idx < ifile_blocks) {
1901                                 r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx,
1902                                                                 &fblk);
1903                                 if (r != EOK)
1904                                         goto Finish;
1905                         } else {
1906                                 rr = ext4_fs_append_inode_dblk(&ref, &fblk,
1907                                                                &iblk_idx);
1908                                 if (rr != EOK) {
1909                                         /* Unable to append more blocks. But
1910                                          * some block might be allocated already
1911                                          * */
1912                                         break;
1913                                 }
1914                         }
1915
1916                         iblk_idx++;
1917
1918                         if (!fblock_start) {
1919                                 fblock_start = fblk;
1920                         }
1921
1922                         if ((fblock_start + fblock_count) != fblk)
1923                                 break;
1924
1925                         fblock_count++;
1926                 }
1927
1928                 r = ext4_blocks_set_direct(file->mp->fs.bdev, u8_buf, fblock_start,
1929                                            fblock_count);
1930                 if (r != EOK)
1931                         break;
1932
1933                 size -= block_size * fblock_count;
1934                 u8_buf += block_size * fblock_count;
1935                 file->fpos += block_size * fblock_count;
1936
1937                 if (wcnt)
1938                         *wcnt += block_size * fblock_count;
1939
1940                 fblock_start = fblk;
1941                 fblock_count = 1;
1942
1943                 if (rr != EOK) {
1944                         /*ext4_fs_append_inode_block has failed and no
1945                          * more blocks might be written. But node size
1946                          * should be updated.*/
1947                         r = rr;
1948                         goto out_fsize;
1949                 }
1950         }
1951
1952         /*Stop write back cache mode*/
1953         ext4_block_cache_write_back(file->mp->fs.bdev, 0);
1954
1955         if (r != EOK)
1956                 goto Finish;
1957
1958         if (size) {
1959                 uint64_t off;
1960                 if (iblk_idx < ifile_blocks) {
1961                         r = ext4_fs_init_inode_dblk_idx(&ref, iblk_idx, &fblk);
1962                         if (r != EOK)
1963                                 goto Finish;
1964                 } else {
1965                         r = ext4_fs_append_inode_dblk(&ref, &fblk, &iblk_idx);
1966                         if (r != EOK)
1967                                 /*Node size sholud be updated.*/
1968                                 goto out_fsize;
1969                 }
1970
1971                 off = fblk * block_size;
1972                 r = ext4_block_writebytes(file->mp->fs.bdev, off, u8_buf, size);
1973                 if (r != EOK)
1974                         goto Finish;
1975
1976                 file->fpos += size;
1977
1978                 if (wcnt)
1979                         *wcnt += size;
1980         }
1981
1982 out_fsize:
1983         if (file->fpos > file->fsize) {
1984                 file->fsize = file->fpos;
1985                 ext4_inode_set_size(ref.inode, file->fsize);
1986                 ref.dirty = true;
1987         }
1988
1989 Finish:
1990         r = ext4_fs_put_inode_ref(&ref);
1991
1992         if (r != EOK)
1993                 ext4_trans_abort(file->mp);
1994         else
1995                 ext4_trans_stop(file->mp);
1996
1997         EXT4_MP_UNLOCK(file->mp);
1998         return r;
1999 }
2000
2001 int ext4_fseek(ext4_file *file, uint64_t offset, uint32_t origin)
2002 {
2003         switch (origin) {
2004         case SEEK_SET:
2005                 if (offset > file->fsize)
2006                         return EINVAL;
2007
2008                 file->fpos = offset;
2009                 return EOK;
2010         case SEEK_CUR:
2011                 if ((offset + file->fpos) > file->fsize)
2012                         return EINVAL;
2013
2014                 file->fpos += offset;
2015                 return EOK;
2016         case SEEK_END:
2017                 if (offset > file->fsize)
2018                         return EINVAL;
2019
2020                 file->fpos = file->fsize - offset;
2021                 return EOK;
2022         }
2023         return EINVAL;
2024 }
2025
2026 uint64_t ext4_ftell(ext4_file *file)
2027 {
2028         return file->fpos;
2029 }
2030
2031 uint64_t ext4_fsize(ext4_file *file)
2032 {
2033         return file->fsize;
2034 }
2035
2036
2037 static int ext4_trans_get_inode_ref(const char *path,
2038                                     struct ext4_mountpoint *mp,
2039                                     struct ext4_inode_ref *inode_ref)
2040 {
2041         int r;
2042         ext4_file f;
2043
2044         ext4_trans_start(mp);
2045         r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
2046         if (r != EOK) {
2047                 ext4_trans_abort(mp);
2048                 return r;
2049         }
2050
2051         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, inode_ref);
2052         if (r != EOK) {
2053                 ext4_trans_abort(mp);
2054                 return r;
2055         }
2056
2057         return r;
2058 }
2059
2060 static int ext4_trans_put_inode_ref(struct ext4_mountpoint *mp,
2061                                     struct ext4_inode_ref *inode_ref)
2062 {
2063         int r;
2064
2065         r = ext4_fs_put_inode_ref(inode_ref);
2066         if (r != EOK)
2067                 ext4_trans_abort(mp);
2068         else
2069                 ext4_trans_stop(mp);
2070
2071         return r;
2072 }
2073
2074
2075 int ext4_raw_inode_fill(const char *path, uint32_t *ret_ino,
2076                         struct ext4_inode *inode)
2077 {
2078         int r;
2079         ext4_file f;
2080         struct ext4_inode_ref inode_ref;
2081         struct ext4_mountpoint *mp = ext4_get_mount(path);
2082
2083         if (!mp)
2084                 return ENOENT;
2085
2086         EXT4_MP_LOCK(mp);
2087
2088         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
2089         if (r != EOK) {
2090                 EXT4_MP_UNLOCK(mp);
2091                 return r;
2092         }
2093
2094         /*Load parent*/
2095         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
2096         if (r != EOK) {
2097                 EXT4_MP_UNLOCK(mp);
2098                 return r;
2099         }
2100
2101         if (ret_ino)
2102                 *ret_ino = f.inode;
2103
2104         memcpy(inode, inode_ref.inode, sizeof(struct ext4_inode));
2105         ext4_fs_put_inode_ref(&inode_ref);
2106         EXT4_MP_UNLOCK(mp);
2107
2108         return r;
2109 }
2110
2111 int ext4_mode_set(const char *path, uint32_t mode)
2112 {
2113         int r;
2114         uint32_t orig_mode;
2115         struct ext4_inode_ref inode_ref;
2116         struct ext4_mountpoint *mp = ext4_get_mount(path);
2117
2118         if (!mp)
2119                 return ENOENT;
2120
2121         if (mp->fs.read_only)
2122                 return EROFS;
2123
2124         EXT4_MP_LOCK(mp);
2125
2126         r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
2127         if (r != EOK)
2128                 goto Finish;
2129
2130         orig_mode = ext4_inode_get_mode(&mp->fs.sb, inode_ref.inode);
2131         orig_mode &= ~0xFFF;
2132         orig_mode |= mode & 0xFFF;
2133         ext4_inode_set_mode(&mp->fs.sb, inode_ref.inode, orig_mode);
2134
2135         inode_ref.dirty = true;
2136         r = ext4_trans_put_inode_ref(mp, &inode_ref);
2137
2138         Finish:
2139         EXT4_MP_UNLOCK(mp);
2140
2141         return r;
2142 }
2143
2144 int ext4_owner_set(const char *path, uint32_t uid, uint32_t gid)
2145 {
2146         int r;
2147         struct ext4_inode_ref inode_ref;
2148         struct ext4_mountpoint *mp = ext4_get_mount(path);
2149
2150         if (!mp)
2151                 return ENOENT;
2152
2153         if (mp->fs.read_only)
2154                 return EROFS;
2155
2156         EXT4_MP_LOCK(mp);
2157
2158         r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
2159         if (r != EOK)
2160                 goto Finish;
2161
2162         ext4_inode_set_uid(inode_ref.inode, uid);
2163         ext4_inode_set_gid(inode_ref.inode, gid);
2164
2165         inode_ref.dirty = true;
2166         r = ext4_trans_put_inode_ref(mp, &inode_ref);
2167
2168         Finish:
2169         EXT4_MP_UNLOCK(mp);
2170
2171         return r;
2172 }
2173
2174 int ext4_mode_get(const char *path, uint32_t *mode)
2175 {
2176         struct ext4_inode_ref inode_ref;
2177         struct ext4_mountpoint *mp = ext4_get_mount(path);
2178         ext4_file f;
2179         int r;
2180
2181         if (!mp)
2182                 return ENOENT;
2183
2184         EXT4_MP_LOCK(mp);
2185
2186         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
2187         if (r != EOK)
2188                 goto Finish;
2189
2190         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
2191         if (r != EOK)
2192                 goto Finish;
2193
2194         *mode = ext4_inode_get_mode(&mp->fs.sb, inode_ref.inode);
2195         r = ext4_fs_put_inode_ref(&inode_ref);
2196
2197         Finish:
2198         EXT4_MP_UNLOCK(mp);
2199
2200         return r;
2201 }
2202
2203 int ext4_owner_get(const char *path, uint32_t *uid, uint32_t *gid)
2204 {
2205         struct ext4_inode_ref inode_ref;
2206         struct ext4_mountpoint *mp = ext4_get_mount(path);
2207         ext4_file f;
2208         int r;
2209
2210         if (!mp)
2211                 return ENOENT;
2212
2213         EXT4_MP_LOCK(mp);
2214
2215         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
2216         if (r != EOK)
2217                 goto Finish;
2218
2219         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
2220         if (r != EOK)
2221                 goto Finish;
2222
2223         *uid = ext4_inode_get_uid(inode_ref.inode);
2224         *gid = ext4_inode_get_gid(inode_ref.inode);
2225         r = ext4_fs_put_inode_ref(&inode_ref);
2226
2227         Finish:
2228         EXT4_MP_UNLOCK(mp);
2229
2230         return r;
2231 }
2232
2233 int ext4_atime_set(const char *path, uint32_t atime)
2234 {
2235         struct ext4_inode_ref inode_ref;
2236         struct ext4_mountpoint *mp = ext4_get_mount(path);
2237         int r;
2238
2239         if (!mp)
2240                 return ENOENT;
2241
2242         if (mp->fs.read_only)
2243                 return EROFS;
2244
2245         EXT4_MP_LOCK(mp);
2246
2247         r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
2248         if (r != EOK)
2249                 goto Finish;
2250
2251         ext4_inode_set_access_time(inode_ref.inode, atime);
2252         inode_ref.dirty = true;
2253         r = ext4_trans_put_inode_ref(mp, &inode_ref);
2254
2255         Finish:
2256         EXT4_MP_UNLOCK(mp);
2257
2258         return r;
2259 }
2260
2261 int ext4_mtime_set(const char *path, uint32_t mtime)
2262 {
2263         struct ext4_inode_ref inode_ref;
2264         struct ext4_mountpoint *mp = ext4_get_mount(path);
2265         int r;
2266
2267         if (!mp)
2268                 return ENOENT;
2269
2270         if (mp->fs.read_only)
2271                 return EROFS;
2272
2273         EXT4_MP_LOCK(mp);
2274
2275         r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
2276         if (r != EOK)
2277                 goto Finish;
2278
2279         ext4_inode_set_modif_time(inode_ref.inode, mtime);
2280         inode_ref.dirty = true;
2281         r = ext4_trans_put_inode_ref(mp, &inode_ref);
2282
2283         Finish:
2284         EXT4_MP_UNLOCK(mp);
2285
2286         return r;
2287 }
2288
2289 int ext4_ctime_set(const char *path, uint32_t ctime)
2290 {
2291         struct ext4_inode_ref inode_ref;
2292         struct ext4_mountpoint *mp = ext4_get_mount(path);
2293         int r;
2294
2295         if (!mp)
2296                 return ENOENT;
2297
2298         if (mp->fs.read_only)
2299                 return EROFS;
2300
2301         EXT4_MP_LOCK(mp);
2302
2303         r = ext4_trans_get_inode_ref(path, mp, &inode_ref);
2304         if (r != EOK)
2305                 goto Finish;
2306
2307         ext4_inode_set_change_inode_time(inode_ref.inode, ctime);
2308         inode_ref.dirty = true;
2309         r = ext4_trans_put_inode_ref(mp, &inode_ref);
2310
2311         Finish:
2312         EXT4_MP_UNLOCK(mp);
2313
2314         return r;
2315 }
2316
2317 int ext4_atime_get(const char *path, uint32_t *atime)
2318 {
2319         struct ext4_inode_ref inode_ref;
2320         struct ext4_mountpoint *mp = ext4_get_mount(path);
2321         ext4_file f;
2322         int r;
2323
2324         if (!mp)
2325                 return ENOENT;
2326
2327         EXT4_MP_LOCK(mp);
2328
2329         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
2330         if (r != EOK)
2331                 goto Finish;
2332
2333         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
2334         if (r != EOK)
2335                 goto Finish;
2336
2337         *atime = ext4_inode_get_access_time(inode_ref.inode);
2338         r = ext4_fs_put_inode_ref(&inode_ref);
2339
2340         Finish:
2341         EXT4_MP_UNLOCK(mp);
2342
2343         return r;
2344 }
2345
2346 int ext4_mtime_get(const char *path, uint32_t *mtime)
2347 {
2348         struct ext4_inode_ref inode_ref;
2349         struct ext4_mountpoint *mp = ext4_get_mount(path);
2350         ext4_file f;
2351         int r;
2352
2353         if (!mp)
2354                 return ENOENT;
2355
2356         EXT4_MP_LOCK(mp);
2357
2358         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
2359         if (r != EOK)
2360                 goto Finish;
2361
2362         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
2363         if (r != EOK)
2364                 goto Finish;
2365
2366         *mtime = ext4_inode_get_modif_time(inode_ref.inode);
2367         r = ext4_fs_put_inode_ref(&inode_ref);
2368
2369         Finish:
2370         EXT4_MP_UNLOCK(mp);
2371
2372         return r;
2373 }
2374
2375 int ext4_ctime_get(const char *path, uint32_t *ctime)
2376 {
2377         struct ext4_inode_ref inode_ref;
2378         struct ext4_mountpoint *mp = ext4_get_mount(path);
2379         ext4_file f;
2380         int r;
2381
2382         if (!mp)
2383                 return ENOENT;
2384
2385         EXT4_MP_LOCK(mp);
2386
2387         r = ext4_generic_open2(&f, path, O_RDONLY, EXT4_DE_UNKNOWN, NULL, NULL);
2388         if (r != EOK)
2389                 goto Finish;
2390
2391         r = ext4_fs_get_inode_ref(&mp->fs, f.inode, &inode_ref);
2392         if (r != EOK)
2393                 goto Finish;
2394
2395         *ctime = ext4_inode_get_change_inode_time(inode_ref.inode);
2396         r = ext4_fs_put_inode_ref(&inode_ref);
2397
2398         Finish:
2399         EXT4_MP_UNLOCK(mp);
2400
2401         return r;
2402 }
2403
2404 static int ext4_fsymlink_set(ext4_file *f, const void *buf, uint32_t size)
2405 {
2406         struct ext4_inode_ref ref;
2407         uint32_t sblock;
2408         ext4_fsblk_t fblock;
2409         uint32_t block_size;
2410         int r;
2411
2412         ext4_assert(f && f->mp);
2413
2414         if (!size)
2415                 return EOK;
2416
2417         r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
2418         if (r != EOK)
2419                 return r;
2420
2421         /*Sync file size*/
2422         block_size = ext4_sb_get_block_size(&f->mp->fs.sb);
2423         if (size > block_size) {
2424                 r = EINVAL;
2425                 goto Finish;
2426         }
2427         r = ext4_ftruncate_no_lock(f, 0);
2428         if (r != EOK)
2429                 goto Finish;
2430
2431         /*Start write back cache mode.*/
2432         r = ext4_block_cache_write_back(f->mp->fs.bdev, 1);
2433         if (r != EOK)
2434                 goto Finish;
2435
2436         /*If the size of symlink is smaller than 60 bytes*/
2437         if (size < sizeof(ref.inode->blocks)) {
2438                 memset(ref.inode->blocks, 0, sizeof(ref.inode->blocks));
2439                 memcpy(ref.inode->blocks, buf, size);
2440                 ext4_inode_clear_flag(ref.inode, EXT4_INODE_FLAG_EXTENTS);
2441         } else {
2442                 ext4_fs_inode_blocks_init(&f->mp->fs, &ref);
2443                 r = ext4_fs_append_inode_dblk(&ref, &fblock, &sblock);
2444                 if (r != EOK)
2445                         goto Finish;
2446
2447                 r = ext4_block_writebytes(f->mp->fs.bdev, 0, buf, size);
2448                 if (r != EOK)
2449                         goto Finish;
2450
2451         }
2452
2453         /*Stop write back cache mode*/
2454         ext4_block_cache_write_back(f->mp->fs.bdev, 0);
2455
2456         if (r != EOK)
2457                 goto Finish;
2458
2459         ext4_inode_set_size(ref.inode, size);
2460         ref.dirty = true;
2461
2462         f->fsize = size;
2463         if (f->fpos > size)
2464                 f->fpos = size;
2465
2466 Finish:
2467         ext4_fs_put_inode_ref(&ref);
2468         return r;
2469 }
2470
2471 int ext4_fsymlink(const char *target, const char *path)
2472 {
2473         struct ext4_mountpoint *mp = ext4_get_mount(path);
2474         int r;
2475         ext4_file f;
2476         int filetype;
2477
2478         if (!mp)
2479                 return ENOENT;
2480
2481         if (mp->fs.read_only)
2482                 return EROFS;
2483
2484         filetype = EXT4_DE_SYMLINK;
2485
2486         EXT4_MP_LOCK(mp);
2487         ext4_trans_start(mp);
2488
2489         ext4_block_cache_write_back(mp->fs.bdev, 1);
2490         r = ext4_generic_open2(&f, path, O_RDWR|O_CREAT, filetype, NULL, NULL);
2491         if (r == EOK)
2492                 r = ext4_fsymlink_set(&f, target, strlen(target));
2493         else
2494                 goto Finish;
2495
2496         ext4_fclose(&f);
2497
2498 Finish:
2499         ext4_block_cache_write_back(mp->fs.bdev, 0);
2500
2501         if (r != EOK)
2502                 ext4_trans_abort(mp);
2503         else
2504                 ext4_trans_stop(mp);
2505
2506         EXT4_MP_UNLOCK(mp);
2507         return r;
2508 }
2509
2510 int ext4_readlink(const char *path, char *buf, size_t bufsize, size_t *rcnt)
2511 {
2512         struct ext4_mountpoint *mp = ext4_get_mount(path);
2513         int r;
2514         ext4_file f;
2515         int filetype;
2516
2517         if (!mp)
2518                 return ENOENT;
2519
2520         if (!buf)
2521                 return EINVAL;
2522
2523         filetype = EXT4_DE_SYMLINK;
2524
2525         EXT4_MP_LOCK(mp);
2526         ext4_block_cache_write_back(mp->fs.bdev, 1);
2527         r = ext4_generic_open2(&f, path, O_RDONLY, filetype, NULL, NULL);
2528         if (r == EOK)
2529                 r = ext4_fread(&f, buf, bufsize, rcnt);
2530         else
2531                 goto Finish;
2532
2533         ext4_fclose(&f);
2534
2535 Finish:
2536         ext4_block_cache_write_back(mp->fs.bdev, 0);
2537         if (r != EOK)
2538                 ext4_trans_abort(mp);
2539         else
2540                 ext4_trans_stop(mp);
2541
2542         EXT4_MP_UNLOCK(mp);
2543         return r;
2544 }
2545
2546 static int ext4_mknod_set(ext4_file *f, uint32_t dev)
2547 {
2548         struct ext4_inode_ref ref;
2549         int r;
2550
2551         ext4_assert(f && f->mp);
2552
2553         r = ext4_fs_get_inode_ref(&f->mp->fs, f->inode, &ref);
2554         if (r != EOK)
2555                 return r;
2556
2557         ext4_inode_set_dev(ref.inode, dev);
2558
2559         ext4_inode_set_size(ref.inode, 0);
2560         ref.dirty = true;
2561
2562         f->fsize = 0;
2563         f->fpos = 0;
2564
2565         r = ext4_fs_put_inode_ref(&ref);
2566         return r;
2567 }
2568
2569 int ext4_mknod(const char *path, int filetype, uint32_t dev)
2570 {
2571         struct ext4_mountpoint *mp = ext4_get_mount(path);
2572         int r;
2573         ext4_file f;
2574
2575         if (!mp)
2576                 return ENOENT;
2577
2578         if (mp->fs.read_only)
2579                 return EROFS;
2580
2581         /*
2582          * The filetype shouldn't be normal file, directory or
2583          * unknown.
2584          */
2585         if (filetype == EXT4_DE_UNKNOWN ||
2586             filetype == EXT4_DE_REG_FILE ||
2587             filetype == EXT4_DE_DIR ||
2588             filetype == EXT4_DE_SYMLINK)
2589                 return EINVAL;
2590
2591         /*
2592          * Nor should it be any bogus value.
2593          */
2594         if (filetype != EXT4_DE_CHRDEV &&
2595             filetype != EXT4_DE_BLKDEV &&
2596             filetype != EXT4_DE_FIFO &&
2597             filetype != EXT4_DE_SOCK)
2598                 return EINVAL;
2599
2600         EXT4_MP_LOCK(mp);
2601         ext4_trans_start(mp);
2602
2603         ext4_block_cache_write_back(mp->fs.bdev, 1);
2604         r = ext4_generic_open2(&f, path, O_RDWR|O_CREAT, filetype, NULL, NULL);
2605         if (r == EOK) {
2606                 if (filetype == EXT4_DE_CHRDEV ||
2607                     filetype == EXT4_DE_BLKDEV)
2608                         r = ext4_mknod_set(&f, dev);
2609         } else
2610                 goto Finish;
2611
2612         ext4_fclose(&f);
2613
2614 Finish:
2615         ext4_block_cache_write_back(mp->fs.bdev, 0);
2616
2617         if (r != EOK)
2618                 ext4_trans_abort(mp);
2619         else
2620                 ext4_trans_stop(mp);
2621
2622         EXT4_MP_UNLOCK(mp);
2623         return r;
2624 }
2625
2626 int ext4_setxattr(const char *path, const char *name, size_t name_len,
2627                   const void *data, size_t data_size)
2628 {
2629         bool found;
2630         int r = EOK;
2631         ext4_file f;
2632         uint32_t inode;
2633         uint8_t name_index;
2634         const char *dissected_name = NULL;
2635         size_t dissected_len = 0;
2636         struct ext4_inode_ref inode_ref;
2637         struct ext4_mountpoint *mp = ext4_get_mount(path);
2638         if (!mp)
2639                 return ENOENT;
2640
2641         if (mp->fs.read_only)
2642                 return EROFS;
2643
2644         dissected_name = ext4_extract_xattr_name(name, name_len,
2645                                 &name_index, &dissected_len,
2646                                 &found);
2647         if (!found)
2648                 return EINVAL;
2649
2650         EXT4_MP_LOCK(mp);
2651         ext4_trans_start(mp);
2652
2653         r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
2654         if (r != EOK)
2655                 goto Finish;
2656         inode = f.inode;
2657         ext4_fclose(&f);
2658
2659         r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
2660         if (r != EOK)
2661                 goto Finish;
2662
2663         r = ext4_xattr_set(&inode_ref, name_index, dissected_name,
2664                         dissected_len, data, data_size);
2665
2666         ext4_fs_put_inode_ref(&inode_ref);
2667 Finish:
2668         if (r != EOK)
2669                 ext4_trans_abort(mp);
2670         else
2671                 ext4_trans_stop(mp);
2672
2673         EXT4_MP_UNLOCK(mp);
2674         return r;
2675 }
2676
2677 int ext4_getxattr(const char *path, const char *name, size_t name_len,
2678                   void *buf, size_t buf_size, size_t *data_size)
2679 {
2680         bool found;
2681         int r = EOK;
2682         ext4_file f;
2683         uint32_t inode;
2684         uint8_t name_index;
2685         const char *dissected_name = NULL;
2686         size_t dissected_len = 0;
2687         struct ext4_inode_ref inode_ref;
2688         struct ext4_mountpoint *mp = ext4_get_mount(path);
2689         if (!mp)
2690                 return ENOENT;
2691
2692         dissected_name = ext4_extract_xattr_name(name, name_len,
2693                                 &name_index, &dissected_len,
2694                                 &found);
2695         if (!found)
2696                 return EINVAL;
2697
2698         EXT4_MP_LOCK(mp);
2699         r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
2700         if (r != EOK)
2701                 goto Finish;
2702         inode = f.inode;
2703         ext4_fclose(&f);
2704
2705         r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
2706         if (r != EOK)
2707                 goto Finish;
2708
2709         r = ext4_xattr_get(&inode_ref, name_index, dissected_name,
2710                                 dissected_len, buf, buf_size, data_size);
2711
2712         ext4_fs_put_inode_ref(&inode_ref);
2713 Finish:
2714         EXT4_MP_UNLOCK(mp);
2715         return r;
2716 }
2717
2718 int ext4_listxattr(const char *path, char *list, size_t size, size_t *ret_size)
2719 {
2720         int r = EOK;
2721         ext4_file f;
2722         uint32_t inode;
2723         size_t list_len, list_size = 0;
2724         struct ext4_inode_ref inode_ref;
2725         struct ext4_xattr_list_entry *xattr_list = NULL,
2726                                      *entry = NULL;
2727         struct ext4_mountpoint *mp = ext4_get_mount(path);
2728         if (!mp)
2729                 return ENOENT;
2730
2731         EXT4_MP_LOCK(mp);
2732         r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
2733         if (r != EOK)
2734                 goto Finish;
2735         inode = f.inode;
2736         ext4_fclose(&f);
2737
2738         r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
2739         if (r != EOK)
2740                 goto Finish;
2741
2742         r = ext4_xattr_list(&inode_ref, NULL, &list_len);
2743         if (r == EOK && list_len) {
2744                 xattr_list = ext4_malloc(list_len);
2745                 if (!xattr_list) {
2746                         ext4_fs_put_inode_ref(&inode_ref);
2747                         r = ENOMEM;
2748                         goto Finish;
2749                 }
2750                 entry = xattr_list;
2751                 r = ext4_xattr_list(&inode_ref, entry, &list_len);
2752                 if (r != EOK) {
2753                         ext4_fs_put_inode_ref(&inode_ref);
2754                         goto Finish;
2755                 }
2756
2757                 for (;entry;entry = entry->next) {
2758                         size_t prefix_len;
2759                         const char *prefix =
2760                                 ext4_get_xattr_name_prefix(entry->name_index,
2761                                                            &prefix_len);
2762                         if (size) {
2763                                 if (prefix_len + entry->name_len + 1 > size) {
2764                                         ext4_fs_put_inode_ref(&inode_ref);
2765                                         r = ERANGE;
2766                                         goto Finish;
2767                                 }
2768                         }
2769
2770                         if (list && size) {
2771                                 memcpy(list, prefix, prefix_len);
2772                                 list += prefix_len;
2773                                 memcpy(list, entry->name,
2774                                         entry->name_len);
2775                                 list[entry->name_len] = 0;
2776                                 list += entry->name_len + 1;
2777
2778                                 size -= prefix_len + entry->name_len + 1;
2779                         }
2780
2781                         list_size += prefix_len + entry->name_len + 1;
2782                 }
2783                 if (ret_size)
2784                         *ret_size = list_size;
2785
2786         }
2787         ext4_fs_put_inode_ref(&inode_ref);
2788 Finish:
2789         EXT4_MP_UNLOCK(mp);
2790         if (xattr_list)
2791                 ext4_free(xattr_list);
2792
2793         return r;
2794
2795 }
2796
2797 int ext4_removexattr(const char *path, const char *name, size_t name_len)
2798 {
2799         bool found;
2800         int r = EOK;
2801         ext4_file f;
2802         uint32_t inode;
2803         uint8_t name_index;
2804         const char *dissected_name = NULL;
2805         size_t dissected_len = 0;
2806         struct ext4_inode_ref inode_ref;
2807         struct ext4_mountpoint *mp = ext4_get_mount(path);
2808         if (!mp)
2809                 return ENOENT;
2810
2811         if (mp->fs.read_only)
2812                 return EROFS;
2813
2814         dissected_name = ext4_extract_xattr_name(name, name_len,
2815                                                 &name_index, &dissected_len,
2816                                                 &found);
2817         if (!found)
2818                 return EINVAL;
2819
2820         EXT4_MP_LOCK(mp);
2821         ext4_trans_start(mp);
2822
2823         r = ext4_generic_open2(&f, path, O_RDWR, EXT4_DE_UNKNOWN, NULL, NULL);
2824         if (r != EOK)
2825                 goto Finish;
2826         inode = f.inode;
2827         ext4_fclose(&f);
2828
2829         r = ext4_fs_get_inode_ref(&mp->fs, inode, &inode_ref);
2830         if (r != EOK)
2831                 goto Finish;
2832
2833         r = ext4_xattr_remove(&inode_ref, name_index, dissected_name,
2834                               dissected_len);
2835
2836         ext4_fs_put_inode_ref(&inode_ref);
2837 Finish:
2838         if (r != EOK)
2839                 ext4_trans_abort(mp);
2840         else
2841                 ext4_trans_stop(mp);
2842
2843         EXT4_MP_UNLOCK(mp);
2844         return r;
2845
2846 }
2847
2848 /*********************************DIRECTORY OPERATION************************/
2849
2850 int ext4_dir_rm(const char *path)
2851 {
2852         int r;
2853         int len;
2854         ext4_file f;
2855
2856         struct ext4_mountpoint *mp = ext4_get_mount(path);
2857         struct ext4_inode_ref act;
2858         struct ext4_inode_ref child;
2859         struct ext4_dir_iter it;
2860
2861         uint32_t name_off;
2862         uint32_t inode_up;
2863         uint32_t inode_current;
2864         uint32_t depth = 1;
2865
2866         bool has_children;
2867         bool is_goal;
2868         bool dir_end;
2869
2870         if (!mp)
2871                 return ENOENT;
2872
2873         if (mp->fs.read_only)
2874                 return EROFS;
2875
2876         EXT4_MP_LOCK(mp);
2877
2878         struct ext4_fs *const fs = &mp->fs;
2879
2880         /*Check if exist.*/
2881         r = ext4_generic_open(&f, path, "r", false, &inode_up, &name_off);
2882         if (r != EOK) {
2883                 ext4_trans_abort(mp);
2884                 EXT4_MP_UNLOCK(mp);
2885                 return r;
2886         }
2887
2888         path += name_off;
2889         len = ext4_path_check(path, &is_goal);
2890
2891         inode_current = f.inode;
2892
2893         ext4_block_cache_write_back(mp->fs.bdev, 1);
2894
2895         do {
2896
2897                 uint64_t act_curr_pos = 0;
2898                 has_children = false;
2899                 dir_end = false;
2900
2901                 while (r == EOK && !has_children && !dir_end) {
2902
2903                         /*Load directory node.*/
2904                         r = ext4_fs_get_inode_ref(fs, inode_current, &act);
2905                         if (r != EOK) {
2906                                 break;
2907                         }
2908
2909                         /*Initialize iterator.*/
2910                         r = ext4_dir_iterator_init(&it, &act, act_curr_pos);
2911                         if (r != EOK) {
2912                                 ext4_fs_put_inode_ref(&act);
2913                                 break;
2914                         }
2915
2916                         if (!it.curr) {
2917                                 dir_end = true;
2918                                 goto End;
2919                         }
2920
2921                         ext4_trans_start(mp);
2922
2923                         /*Get up directory inode when ".." entry*/
2924                         if ((it.curr->name_len == 2) &&
2925                             ext4_is_dots(it.curr->name, it.curr->name_len)) {
2926                                 inode_up = ext4_dir_en_get_inode(it.curr);
2927                         }
2928
2929                         /*If directory or file entry,  but not "." ".." entry*/
2930                         if (!ext4_is_dots(it.curr->name, it.curr->name_len)) {
2931
2932                                 /*Get child inode reference do unlink
2933                                  * directory/file.*/
2934                                 uint32_t cinode;
2935                                 uint32_t inode_type;
2936                                 cinode = ext4_dir_en_get_inode(it.curr);
2937                                 r = ext4_fs_get_inode_ref(fs, cinode, &child);
2938                                 if (r != EOK)
2939                                         goto End;
2940
2941                                 /*If directory with no leaf children*/
2942                                 r = ext4_has_children(&has_children, &child);
2943                                 if (r != EOK) {
2944                                         ext4_fs_put_inode_ref(&child);
2945                                         goto End;
2946                                 }
2947
2948                                 if (has_children) {
2949                                         /*Has directory children. Go into this
2950                                          * directory.*/
2951                                         inode_up = inode_current;
2952                                         inode_current = cinode;
2953                                         depth++;
2954                                         ext4_fs_put_inode_ref(&child);
2955                                         goto End;
2956                                 }
2957                                 inode_type = ext4_inode_type(&mp->fs.sb,
2958                                                 child.inode);
2959
2960                                 /* Truncate */
2961                                 if (inode_type != EXT4_INODE_MODE_DIRECTORY)
2962                                         r = ext4_trunc_inode(mp, child.index, 0);
2963                                 else
2964                                         r = ext4_trunc_dir(mp, &act, &child);
2965
2966                                 if (r != EOK) {
2967                                         ext4_fs_put_inode_ref(&child);
2968                                         goto End;
2969                                 }
2970
2971                                 /*No children in child directory or file. Just
2972                                  * unlink.*/
2973                                 r = ext4_unlink(f.mp, &act, &child,
2974                                                 (char *)it.curr->name,
2975                                                 it.curr->name_len);
2976                                 if (r != EOK) {
2977                                         ext4_fs_put_inode_ref(&child);
2978                                         goto End;
2979                                 }
2980
2981                                 ext4_inode_set_del_time(child.inode, -1L);
2982                                 ext4_inode_set_links_cnt(child.inode, 0);
2983                                 child.dirty = true;
2984
2985                                 r = ext4_fs_free_inode(&child);
2986                                 if (r != EOK) {
2987                                         ext4_fs_put_inode_ref(&child);
2988                                         goto End;
2989                                 }
2990
2991                                 r = ext4_fs_put_inode_ref(&child);
2992                                 if (r != EOK)
2993                                         goto End;
2994
2995                         }
2996
2997                         r = ext4_dir_iterator_next(&it);
2998                         if (r != EOK)
2999                                 goto End;
3000
3001                         act_curr_pos = it.curr_off;
3002 End:
3003                         ext4_dir_iterator_fini(&it);
3004                         if (r == EOK)
3005                                 r = ext4_fs_put_inode_ref(&act);
3006                         else
3007                                 ext4_fs_put_inode_ref(&act);
3008
3009                         if (r != EOK)
3010                                 ext4_trans_abort(mp);
3011                         else
3012                                 ext4_trans_stop(mp);
3013                 }
3014
3015                 if (dir_end) {
3016                         /*Directory iterator reached last entry*/
3017                         depth--;
3018                         if (depth)
3019                                 inode_current = inode_up;
3020
3021                 }
3022
3023                 if (r != EOK)
3024                         break;
3025
3026         } while (depth);
3027
3028         /*Last unlink*/
3029         if (r == EOK && !depth) {
3030                 /*Load parent.*/
3031                 struct ext4_inode_ref parent;
3032                 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_up,
3033                                 &parent);
3034                 if (r != EOK)
3035                         goto Finish;
3036                 r = ext4_fs_get_inode_ref(&f.mp->fs, inode_current,
3037                                 &act);
3038                 if (r != EOK) {
3039                         ext4_fs_put_inode_ref(&act);
3040                         goto Finish;
3041                 }
3042
3043                 ext4_trans_start(mp);
3044
3045                 /* In this place all directories should be
3046                  * unlinked.
3047                  * Last unlink from root of current directory*/
3048                 r = ext4_unlink(f.mp, &parent, &act,
3049                                 (char *)path, len);
3050                 if (r != EOK) {
3051                         ext4_fs_put_inode_ref(&parent);
3052                         ext4_fs_put_inode_ref(&act);
3053                         goto Finish;
3054                 }
3055
3056                 if (ext4_inode_get_links_cnt(act.inode) == 2) {
3057                         ext4_inode_set_del_time(act.inode, -1L);
3058                         ext4_inode_set_links_cnt(act.inode, 0);
3059                         act.dirty = true;
3060                         /*Truncate*/
3061                         r = ext4_trunc_dir(mp, &parent, &act);
3062                         if (r != EOK) {
3063                                 ext4_fs_put_inode_ref(&parent);
3064                                 ext4_fs_put_inode_ref(&act);
3065                                 goto Finish;
3066                         }
3067
3068                         r = ext4_fs_free_inode(&act);
3069                         if (r != EOK) {
3070                                 ext4_fs_put_inode_ref(&parent);
3071                                 ext4_fs_put_inode_ref(&act);
3072                                 goto Finish;
3073                         }
3074                 }
3075
3076                 r = ext4_fs_put_inode_ref(&parent);
3077                 if (r != EOK)
3078                         goto Finish;
3079
3080                 r = ext4_fs_put_inode_ref(&act);
3081         Finish:
3082                 if (r != EOK)
3083                         ext4_trans_abort(mp);
3084                 else
3085                         ext4_trans_stop(mp);
3086         }
3087
3088         ext4_block_cache_write_back(mp->fs.bdev, 0);
3089         EXT4_MP_UNLOCK(mp);
3090
3091         return r;
3092 }
3093
3094 int ext4_dir_mv(const char *path, const char *new_path)
3095 {
3096         return ext4_frename(path, new_path);
3097 }
3098
3099 int ext4_dir_mk(const char *path)
3100 {
3101         int r;
3102         ext4_file f;
3103
3104         struct ext4_mountpoint *mp = ext4_get_mount(path);
3105
3106         if (!mp)
3107                 return ENOENT;
3108
3109         if (mp->fs.read_only)
3110                 return EROFS;
3111
3112         EXT4_MP_LOCK(mp);
3113         ext4_trans_start(mp);
3114
3115         /*Check if exist.*/
3116         r = ext4_generic_open(&f, path, "r", false, 0, 0);
3117         if (r == EOK) {
3118                 /*Directory already created*/
3119                 ext4_trans_stop(mp);
3120                 EXT4_MP_UNLOCK(mp);
3121                 return r;
3122         }
3123
3124         /*Create new dir*/
3125         r = ext4_generic_open(&f, path, "w", false, 0, 0);
3126         if (r != EOK) {
3127                 ext4_trans_abort(mp);
3128                 EXT4_MP_UNLOCK(mp);
3129                 return r;
3130         }
3131
3132         ext4_trans_stop(mp);
3133         EXT4_MP_UNLOCK(mp);
3134         return r;
3135 }
3136
3137 int ext4_dir_open(ext4_dir *dir, const char *path)
3138 {
3139         struct ext4_mountpoint *mp = ext4_get_mount(path);
3140         int r;
3141
3142         if (!mp)
3143                 return ENOENT;
3144
3145         EXT4_MP_LOCK(mp);
3146         r = ext4_generic_open(&dir->f, path, "r", false, 0, 0);
3147         dir->next_off = 0;
3148         EXT4_MP_UNLOCK(mp);
3149         return r;
3150 }
3151
3152 int ext4_dir_close(ext4_dir *dir)
3153 {
3154     return ext4_fclose(&dir->f);
3155 }
3156
3157 const ext4_direntry *ext4_dir_entry_next(ext4_dir *dir)
3158 {
3159 #define EXT4_DIR_ENTRY_OFFSET_TERM (uint64_t)(-1)
3160
3161         int r;
3162         uint16_t name_length;
3163         ext4_direntry *de = 0;
3164         struct ext4_inode_ref dir_inode;
3165         struct ext4_dir_iter it;
3166
3167         EXT4_MP_LOCK(dir->f.mp);
3168
3169         if (dir->next_off == EXT4_DIR_ENTRY_OFFSET_TERM) {
3170                 EXT4_MP_UNLOCK(dir->f.mp);
3171                 return 0;
3172         }
3173
3174         r = ext4_fs_get_inode_ref(&dir->f.mp->fs, dir->f.inode, &dir_inode);
3175         if (r != EOK) {
3176                 goto Finish;
3177         }
3178
3179         r = ext4_dir_iterator_init(&it, &dir_inode, dir->next_off);
3180         if (r != EOK) {
3181                 ext4_fs_put_inode_ref(&dir_inode);
3182                 goto Finish;
3183         }
3184
3185         memset(&dir->de.name, 0, sizeof(dir->de.name));
3186         name_length = ext4_dir_en_get_name_len(&dir->f.mp->fs.sb,
3187                                                it.curr);
3188         memcpy(&dir->de.name, it.curr->name, name_length);
3189
3190         /* Directly copying the content isn't safe for Big-endian targets*/
3191         dir->de.inode = ext4_dir_en_get_inode(it.curr);
3192         dir->de.entry_length = ext4_dir_en_get_entry_len(it.curr);
3193         dir->de.name_length = name_length;
3194         dir->de.inode_type = ext4_dir_en_get_inode_type(&dir->f.mp->fs.sb,
3195                                                       it.curr);
3196
3197         de = &dir->de;
3198
3199         ext4_dir_iterator_next(&it);
3200
3201         dir->next_off = it.curr ? it.curr_off : EXT4_DIR_ENTRY_OFFSET_TERM;
3202
3203         ext4_dir_iterator_fini(&it);
3204         ext4_fs_put_inode_ref(&dir_inode);
3205
3206 Finish:
3207         EXT4_MP_UNLOCK(dir->f.mp);
3208         return de;
3209 }
3210
3211 void ext4_dir_entry_rewind(ext4_dir *dir)
3212 {
3213         dir->next_off = 0;
3214 }
3215
3216 /**
3217  * @}
3218  */