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.
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.
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.
34 /** @addtogroup lwext4
39 * @brief More complex filesystem functions.
41 #ifndef EXT4_EXTENT_H_
42 #define EXT4_EXTENT_H_
44 #include "ext4_config.h"
45 #include "ext4_types.h"
46 #include "ext4_inode.h"
49 /**@brief Get logical number of the block covered by extent.
50 * @param extent Extent to load number from
51 * @return Logical number of the first block covered by extent */
52 static inline uint32_t ext4_extent_get_first_block(struct ext4_extent *extent)
54 return to_le32(extent->first_block);
57 /**@brief Set logical number of the first block covered by extent.
58 * @param extent Extent to set number to
59 * @param iblock Logical number of the first block covered by extent */
60 static inline void ext4_extent_set_first_block(struct ext4_extent *extent,
63 extent->first_block = to_le32(iblock);
66 /**@brief Get number of blocks covered by extent.
67 * @param extent Extent to load count from
68 * @return Number of blocks covered by extent */
69 static inline uint16_t ext4_extent_get_block_count(struct ext4_extent *extent)
71 if (EXT4_EXT_IS_UNWRITTEN(extent))
72 return EXT4_EXT_GET_LEN_UNWRITTEN(extent);
74 return EXT4_EXT_GET_LEN(extent);
76 /**@brief Set number of blocks covered by extent.
77 * @param extent Extent to load count from
78 * @param count Number of blocks covered by extent
79 * @param unwritten Whether the extent is unwritten or not */
80 static inline void ext4_extent_set_block_count(struct ext4_extent *extent,
81 uint16_t count, bool unwritten)
83 EXT4_EXT_SET_LEN(extent, count);
85 EXT4_EXT_SET_UNWRITTEN(extent);
88 /**@brief Get physical number of the first block covered by extent.
89 * @param extent Extent to load number
90 * @return Physical number of the first block covered by extent */
91 static inline uint64_t ext4_extent_get_start(struct ext4_extent *extent)
93 return ((uint64_t)to_le16(extent->start_hi)) << 32 |
94 ((uint64_t)to_le32(extent->start_lo));
98 /**@brief Set physical number of the first block covered by extent.
99 * @param extent Extent to load number
100 * @param fblock Physical number of the first block covered by extent */
101 static inline void ext4_extent_set_start(struct ext4_extent *extent, uint64_t fblock)
103 extent->start_lo = to_le32((fblock << 32) >> 32);
104 extent->start_hi = to_le16((uint16_t)(fblock >> 32));
108 /**@brief Get logical number of the block covered by extent index.
109 * @param index Extent index to load number from
110 * @return Logical number of the first block covered by extent index */
111 static inline uint32_t
112 ext4_extent_index_get_first_block(struct ext4_extent_index *index)
114 return to_le32(index->first_block);
117 /**@brief Set logical number of the block covered by extent index.
118 * @param index Extent index to set number to
119 * @param iblock Logical number of the first block covered by extent index */
121 ext4_extent_index_set_first_block(struct ext4_extent_index *index,
124 index->first_block = to_le32(iblock);
127 /**@brief Get physical number of block where the child node is located.
128 * @param index Extent index to load number from
129 * @return Physical number of the block with child node */
130 static inline uint64_t
131 ext4_extent_index_get_leaf(struct ext4_extent_index *index)
133 return ((uint64_t)to_le16(index->leaf_hi)) << 32 |
134 ((uint64_t)to_le32(index->leaf_lo));
137 /**@brief Set physical number of block where the child node is located.
138 * @param index Extent index to set number to
139 * @param fblock Ohysical number of the block with child node */
140 static inline void ext4_extent_index_set_leaf(struct ext4_extent_index *index,
143 index->leaf_lo = to_le32((fblock << 32) >> 32);
144 index->leaf_hi = to_le16((uint16_t)(fblock >> 32));
147 /**@brief Get magic value from extent header.
148 * @param header Extent header to load value from
149 * @return Magic value of extent header */
150 static inline uint16_t
151 ext4_extent_header_get_magic(struct ext4_extent_header *header)
153 return to_le16(header->magic);
156 /**@brief Set magic value to extent header.
157 * @param header Extent header to set value to
158 * @param magic Magic value of extent header */
159 static inline void ext4_extent_header_set_magic(struct ext4_extent_header *header,
162 header->magic = to_le16(magic);
165 /**@brief Get number of entries from extent header
166 * @param header Extent header to get value from
167 * @return Number of entries covered by extent header */
168 static inline uint16_t
169 ext4_extent_header_get_entries_count(struct ext4_extent_header *header)
171 return to_le16(header->entries_count);
174 /**@brief Set number of entries to extent header
175 * @param header Extent header to set value to
176 * @param count Number of entries covered by extent header */
178 ext4_extent_header_set_entries_count(struct ext4_extent_header *header,
181 header->entries_count = to_le16(count);
184 /**@brief Get maximum number of entries from extent header
185 * @param header Extent header to get value from
186 * @return Maximum number of entries covered by extent header */
187 static inline uint16_t
188 ext4_extent_header_get_max_entries_count(struct ext4_extent_header *header)
190 return to_le16(header->max_entries_count);
193 /**@brief Set maximum number of entries to extent header
194 * @param header Extent header to set value to
195 * @param max_count Maximum number of entries covered by extent header */
197 ext4_extent_header_set_max_entries_count(struct ext4_extent_header *header,
200 header->max_entries_count = to_le16(max_count);
203 /**@brief Get depth of extent subtree.
204 * @param header Extent header to get value from
205 * @return Depth of extent subtree */
206 static inline uint16_t
207 ext4_extent_header_get_depth(struct ext4_extent_header *header)
209 return to_le16(header->depth);
212 /**@brief Set depth of extent subtree.
213 * @param header Extent header to set value to
214 * @param depth Depth of extent subtree */
216 ext4_extent_header_set_depth(struct ext4_extent_header *header, uint16_t depth)
218 header->depth = to_le16(depth);
221 /**@brief Get generation from extent header
222 * @param header Extent header to get value from
223 * @return Generation */
224 static inline uint32_t
225 ext4_extent_header_get_generation(struct ext4_extent_header *header)
227 return to_le32(header->generation);
230 /**@brief Set generation to extent header
231 * @param header Extent header to set value to
232 * @param generation Generation */
234 ext4_extent_header_set_generation(struct ext4_extent_header *header,
237 header->generation = to_le32(generation);
240 /******************************************************************************/
243 static inline void ext4_extent_tree_init(struct ext4_inode_ref *inode_ref)
245 /* Initialize extent root header */
246 struct ext4_extent_header *header =
247 ext4_inode_get_extent_header(inode_ref->inode);
248 ext4_extent_header_set_depth(header, 0);
249 ext4_extent_header_set_entries_count(header, 0);
250 ext4_extent_header_set_generation(header, 0);
251 ext4_extent_header_set_magic(header, EXT4_EXTENT_MAGIC);
253 uint16_t max_entries = (EXT4_INODE_BLOCKS * sizeof(uint32_t) -
254 sizeof(struct ext4_extent_header)) /
255 sizeof(struct ext4_extent);
257 ext4_extent_header_set_max_entries_count(header, max_entries);
258 inode_ref->dirty = true;
264 int ext4_extent_get_blocks(struct ext4_inode_ref *inode_ref, ext4_fsblk_t iblock,
265 uint32_t max_blocks, ext4_fsblk_t *result, bool create,
266 uint32_t *blocks_count);
269 /**@brief Release all data blocks starting from specified logical block.
270 * @param inode_ref I-node to release blocks from
271 * @param iblock_from First logical block to release
272 * @return Error code */
273 int ext4_extent_remove_space(struct ext4_inode_ref *inode_ref, ext4_lblk_t from,
277 #endif /* EXT4_EXTENT_H_ */