| 1 | /*
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| 2 | * Copyright (c) 2011 Frantisek Princ
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libext4
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file libext4_ialloc.c
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| 35 | * @brief Inode (de)allocation operations.
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| 36 | */
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| 37 |
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| 38 | #include <errno.h>
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| 39 | #include <time.h>
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| 40 | #include "libext4.h"
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| 41 |
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| 42 | static uint32_t ext4_ialloc_inode2index_in_group(ext4_superblock_t *sb,
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| 43 | uint32_t inode)
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| 44 | {
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| 45 | uint32_t inodes_per_group = ext4_superblock_get_inodes_per_group(sb);
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| 46 | return (inode - 1) % inodes_per_group;
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| 47 | }
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| 48 |
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| 49 | static uint32_t ext4_ialloc_get_bgid_of_inode(ext4_superblock_t *sb,
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| 50 | uint32_t inode)
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| 51 | {
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| 52 | uint32_t inodes_per_group = ext4_superblock_get_inodes_per_group(sb);
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| 53 | return (inode - 1) / inodes_per_group;
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| 54 |
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| 55 | }
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| 56 |
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| 57 |
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| 58 | int ext4_ialloc_free_inode(ext4_filesystem_t *fs, ext4_inode_ref_t *inode_ref)
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| 59 | {
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| 60 | int rc;
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| 61 | uint32_t block_group = ext4_ialloc_get_bgid_of_inode(
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| 62 | fs->superblock, inode_ref->index);
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| 63 | uint32_t index_in_group = ext4_ialloc_inode2index_in_group(
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| 64 | fs->superblock, inode_ref->index);
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| 65 |
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| 66 | ext4_block_group_ref_t *bg_ref;
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| 67 | rc = ext4_filesystem_get_block_group_ref(fs, block_group, &bg_ref);
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| 68 | if (rc != EOK) {
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| 69 | EXT4FS_DBG("error in loading bg_ref \%d", rc);
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| 70 | return rc;
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| 71 | }
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| 72 |
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| 73 | uint32_t bitmap_block_addr = ext4_block_group_get_inode_bitmap(
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| 74 | bg_ref->block_group, fs->superblock);
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| 75 | block_t *bitmap_block;
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| 76 | rc = block_get(&bitmap_block, fs->device, bitmap_block_addr, 0);
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| 77 | if (rc != EOK) {
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| 78 | EXT4FS_DBG("error in loading bitmap \%d", rc);
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| 79 | return rc;
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| 80 | }
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| 81 |
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| 82 | ext4_bitmap_free_bit(bitmap_block->data, index_in_group);
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| 83 | bitmap_block->dirty = true;
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| 84 |
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| 85 | rc = block_put(bitmap_block);
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| 86 | if (rc != EOK) {
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| 87 | // Error in saving bitmap
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| 88 | ext4_filesystem_put_block_group_ref(bg_ref);
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| 89 | EXT4FS_DBG("error in saving bitmap \%d", rc);
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| 90 | return rc;
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| 91 | }
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| 92 |
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| 93 | // if inode is directory, decrement directories count
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| 94 | if (ext4_inode_is_type(fs->superblock, inode_ref->inode, EXT4_INODE_MODE_DIRECTORY)) {
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| 95 | uint32_t bg_used_dirs = ext4_block_group_get_used_dirs_count(
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| 96 | bg_ref->block_group, fs->superblock);
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| 97 | bg_used_dirs--;
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| 98 | ext4_block_group_set_used_dirs_count(
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| 99 | bg_ref->block_group, fs->superblock, bg_used_dirs);
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| 100 | }
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| 101 |
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| 102 | // Update superblock free inodes count
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| 103 | uint32_t sb_free_inodes = ext4_superblock_get_free_inodes_count(fs->superblock);
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| 104 | sb_free_inodes++;
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| 105 | ext4_superblock_set_free_inodes_count(fs->superblock, sb_free_inodes);
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| 106 |
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| 107 | // Update block group free inodes count
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| 108 | uint32_t free_inodes = ext4_block_group_get_free_inodes_count(
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| 109 | bg_ref->block_group, fs->superblock);
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| 110 | free_inodes++;
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| 111 | ext4_block_group_set_free_inodes_count(bg_ref->block_group,
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| 112 | fs->superblock, free_inodes);
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| 113 | bg_ref->dirty = true;
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| 114 |
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| 115 | rc = ext4_filesystem_put_block_group_ref(bg_ref);
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| 116 | if (rc != EOK) {
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| 117 | EXT4FS_DBG("error in saving bg_ref \%d", rc);
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| 118 | // TODO error
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| 119 | return rc;
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| 120 | }
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| 121 |
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| 122 | return EOK;
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| 123 | }
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| 124 |
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| 125 |
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| 126 | /**
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| 127 | * @}
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| 128 | */
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