2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
6 * Copyright (c) 2012 Martin Sucha
7 * Copyright (c) 2012 Frantisek Princ
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * - Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
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17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
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20 * derived from this software without specific prior written permission.
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,
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28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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34 /** @addtogroup lwext4
39 * @brief More complex filesystem functions.
45 #include <ext4_config.h>
46 #include <ext4_types.h>
51 /**@brief Initialize filesystem and read all needed data.
52 * @param fs Filesystem instance to be initialized
53 * @param bdev Identifier if device with the filesystem
56 int ext4_fs_init(struct ext4_fs *fs, struct ext4_blockdev *bdev);
58 /**@brief Destroy filesystem instance (used by unmount operation).
59 * @param fs Filesystem to be destroyed
62 int ext4_fs_fini(struct ext4_fs *fs);
64 /**@brief Check filesystem's features, if supported by this driver
65 * Function can return EOK and set read_only flag. It mean's that
66 * there are some not-supported features, that can cause problems
67 * during some write operations.
68 * @param fs Filesystem to be checked
69 * @param read_only Flag if filesystem should be mounted only for reading
72 int ext4_fs_check_features(struct ext4_fs *fs, bool *read_only);
74 /**@brief Convert block address to relative index in block group.
75 * @param sb Superblock pointer
76 * @param baddr Block number to convert
77 * @return Relative number of block
79 uint32_t ext4_fs_baddr2_index_in_group(struct ext4_sblock *s, uint32_t baddr);
81 /**@brief Convert relative block address in group to absolute address.
82 * @param s Superblock pointer
83 * @param index Relative block address
84 * @param bgid Block group
85 * @return Absolute block address
87 uint32_t ext4_fs_index_in_group2_baddr(struct ext4_sblock *s, uint32_t index,
90 /**@brief Get reference to block group specified by index.
91 * @param fs Filesystem to find block group on
92 * @param bgid Index of block group to load
93 * @param ref Output pointer for reference
96 int ext4_fs_get_block_group_ref(struct ext4_fs *fs, uint32_t bgid,
97 struct ext4_block_group_ref *ref);
99 /**@brief Put reference to block group.
100 * @param ref Pointer for reference to be put back
103 int ext4_fs_put_block_group_ref(struct ext4_block_group_ref *ref);
105 /**@brief Get reference to i-node specified by index.
106 * @param fs Filesystem to find i-node on
107 * @param index Index of i-node to load
108 * @param ref Output pointer for reference
111 int ext4_fs_get_inode_ref(struct ext4_fs *fs, uint32_t index,
112 struct ext4_inode_ref *ref);
114 /**@brief Put reference to i-node.
115 * @param ref Pointer for reference to be put back
118 int ext4_fs_put_inode_ref(struct ext4_inode_ref *ref);
120 /**@brief Allocate new i-node in the filesystem.
121 * @param fs Filesystem to allocated i-node on
122 * @param inode_ref Output pointer to return reference to allocated i-node
123 * @param flags Flags to be set for newly created i-node
126 int ext4_fs_alloc_inode(struct ext4_fs *fs, struct ext4_inode_ref *inode_ref,
129 /**@brief Release i-node and mark it as free.
130 * @param inode_ref I-node to be released
133 int ext4_fs_free_inode(struct ext4_inode_ref *inode_ref);
135 /**@brief Truncate i-node data blocks.
136 * @param inode_ref I-node to be truncated
137 * @param new_size New size of inode (must be < current size)
140 int ext4_fs_truncate_inode(struct ext4_inode_ref *inode_ref,
143 /**@brief Get physical block address by logical index of the block.
144 * @param inode_ref I-node to read block address from
145 * @param iblock Logical index of block
146 * @param fblock Output pointer for return physical block address
149 int ext4_fs_get_inode_data_block_index(struct ext4_inode_ref *inode_ref,
150 uint64_t iblock, uint32_t *fblock);
152 /**@brief Set physical block address for the block logical address into the i-node.
153 * @param inode_ref I-node to set block address to
154 * @param iblock Logical index of block
155 * @param fblock Physical block address
158 int ext4_fs_set_inode_data_block_index(struct ext4_inode_ref *inode_ref,
159 uint64_t iblock, uint32_t fblock);
161 /**@brief Release data block from i-node
162 * @param inode_ref I-node to release block from
163 * @param iblock Logical block to be released
166 int ext4_fs_release_inode_block(struct ext4_inode_ref *inode_ref,
169 /**@brief Append following logical block to the i-node.
170 * @param inode_ref I-node to append block to
171 * @param fblock Output physical block address of newly allocated block
172 * @param iblock Output logical number of newly allocated block
175 int ext4_fs_append_inode_block(struct ext4_inode_ref *inode_ref,
176 uint32_t *fblock, uint32_t *iblock);
178 #endif /* EXT4_FS_H_ */