1/*
2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
3 *
4 *
5 * HelenOS:
6 * Copyright (c) 2012 Martin Sucha
7 * Copyright (c) 2012 Frantisek Princ
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * - Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * - Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * - The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/** @addtogroup lwext4
35 * @{
36 */
37/**
38 * @file ext4_ialloc.c
39 * @brief Inode allocation procedures.
40 */
41
42#ifndef EXT4_IALLOC_H_
43#define EXT4_IALLOC_H_
44
45#ifdef __cplusplus
46extern "C" {
47#endif
48
49#include <ext4_config.h>
50#include <ext4_types.h>
51
52/**@brief Calculate and set checksum of inode bitmap.
53 * @param sb superblock pointer.
54 * @param bg block group
55 * @param bitmap bitmap buffer
56 */
57void ext4_ialloc_set_bitmap_csum(struct ext4_sblock *sb, struct ext4_bgroup *bg,
58 void *bitmap);
59
60/**@brief Free i-node number and modify filesystem data structers.
61 * @param fs Filesystem, where the i-node is located
62 * @param index Index of i-node to be release
63 * @param is_dir Flag us for information whether i-node is directory or not
64 */
65int ext4_ialloc_free_inode(struct ext4_fs *fs, uint32_t index, bool is_dir);
66
67/**@brief I-node allocation algorithm.
68 * This is more simple algorithm, than Orlov allocator used
69 * in the Linux kernel.
70 * @param fs Filesystem to allocate i-node on
71 * @param index Output value - allocated i-node number
72 * @param is_dir Flag if allocated i-node will be file or directory
73 * @return Error code
74 */
75int ext4_ialloc_alloc_inode(struct ext4_fs *fs, uint32_t *index, bool is_dir);
76
77#ifdef __cplusplus
78}
79#endif
80
81#endif /* EXT4_IALLOC_H_ */
82
83/**
84 * @}
85 */
86