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
38 * @file ext4_block_group.h
39 * @brief Block group function set.
42 #ifndef EXT4_BLOCK_GROUP_H_
43 #define EXT4_BLOCK_GROUP_H_
46 #include <ext4_config.h>
47 #include <ext4_types.h>
48 #include <ext4_super.h>
53 /**@brief Get address of block with data block bitmap.
54 * @param bg pointer to block group
55 * @param s pointer to superblock
56 * @return Address of block with block bitmap
58 static inline uint64_t ext4_bg_get_block_bitmap(struct ext4_bgroup *bg,
59 struct ext4_sblock *s)
61 uint64_t v = to_le32(bg->block_bitmap_lo);
63 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
64 v |= (uint64_t) to_le32(bg->block_bitmap_hi) << 32;
69 /**@brief Get address of block with i-node bitmap.
70 * @param bg Pointer to block group
71 * @param s Pointer to superblock
72 * @return Address of block with i-node bitmap
74 static inline uint64_t ext4_bg_get_inode_bitmap(struct ext4_bgroup *bg,
75 struct ext4_sblock *s)
78 uint64_t v = to_le32(bg->inode_bitmap_lo);
80 if (ext4_sb_get_desc_size(s)> EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
81 v |= (uint64_t) to_le32(bg->inode_bitmap_hi) << 32;
86 /**@brief Get address of the first block of the i-node table.
87 * @param bg Pointer to block group
88 * @param s Pointer to superblock
89 * @return Address of first block of i-node table
91 static inline uint64_t ext4_bg_get_inode_table_first_block(
92 struct ext4_bgroup *bg, struct ext4_sblock *s)
94 uint64_t v = to_le32(bg->inode_table_first_block_lo);
96 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
97 v |= (uint64_t) to_le32(bg->inode_table_first_block_hi) << 32;
102 /**@brief Get number of free blocks in block group.
103 * @param bg Pointer to block group
104 * @param sb Pointer to superblock
105 * @return Number of free blocks in block group
107 static inline uint32_t ext4_bg_get_free_blocks_count(struct ext4_bgroup *bg,
108 struct ext4_sblock *s)
110 uint32_t v = to_le16(bg->free_blocks_count_lo);
112 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
113 v |= (uint32_t) to_le16(bg->free_blocks_count_hi) << 16;
118 /**@brief Set number of free blocks in block group.
119 * @param bg Pointer to block group
120 * @param s Pointer to superblock
121 * @param cnt Number of free blocks in block group
123 static inline void ext4_bg_set_free_blocks_count(struct ext4_bgroup *bg,
124 struct ext4_sblock *s, uint32_t cnt)
126 bg->free_blocks_count_lo = to_le16((cnt << 16) >> 16);
127 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
128 bg->free_blocks_count_hi = to_le16(cnt >> 16);
131 /**@brief Get number of free i-nodes in block group.
132 * @param bg Pointer to block group
133 * @param s Pointer to superblock
134 * @return Number of free i-nodes in block group
136 static inline uint32_t ext4_bg_get_free_inodes_count(struct ext4_bgroup *bg,
137 struct ext4_sblock *s)
139 uint32_t v = to_le16(bg->free_inodes_count_lo);
141 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
142 v |= (uint32_t) to_le16(bg->free_inodes_count_hi) << 16;
147 /**@brief Set number of free i-nodes in block group.
148 * @param bg Pointer to block group
149 * @param s Pointer to superblock
150 * @param cnt Number of free i-nodes in block group
152 static inline void ext4_bg_set_free_inodes_count(struct ext4_bgroup *bg,
153 struct ext4_sblock *s, uint32_t cnt)
155 bg->free_inodes_count_lo = to_le16((cnt << 16) >> 16);
156 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
157 bg->free_inodes_count_hi = to_le16(cnt >> 16);
160 /**@brief Get number of used directories in block group.
161 * @param bg Pointer to block group
162 * @param s Pointer to superblock
163 * @return Number of used directories in block group
165 static inline uint32_t ext4_bg_get_used_dirs_count(struct ext4_bgroup *bg,
166 struct ext4_sblock *s)
168 uint32_t v = to_le16(bg->used_dirs_count_lo);
170 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
171 v |= (uint32_t) to_le16(bg->used_dirs_count_hi) << 16;
176 /**@brief Set number of used directories in block group.
177 * @param bg Pointer to block group
178 * @param s Pointer to superblock
179 * @param cnt Number of used directories in block group
181 static inline void ext4_bg_set_used_dirs_count(struct ext4_bgroup *bg,
182 struct ext4_sblock *s, uint32_t cnt)
184 bg->used_dirs_count_lo = to_le16((cnt << 16) >> 16);
185 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
186 bg->used_dirs_count_hi = to_le16(cnt >> 16);
189 /**@brief Get number of unused i-nodes.
190 * @param bg Pointer to block group
191 * @param s Pointer to superblock
192 * @return Number of unused i-nodes
194 static inline uint32_t ext4_bg_get_itable_unused(struct ext4_bgroup *bg,
195 struct ext4_sblock *s)
198 uint32_t v = to_le16(bg->itable_unused_lo);
200 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
201 v |= (uint32_t) to_le16(bg->itable_unused_hi) << 16;
206 /**@brief Set number of unused i-nodes.
207 * @param bg Pointer to block group
208 * @param s Pointer to superblock
209 * @param cnt Number of unused i-nodes
211 static inline void ext4_bg_set_itable_unused(struct ext4_bgroup *bg,
212 struct ext4_sblock *s, uint32_t cnt)
214 bg->itable_unused_lo = to_le16((cnt << 16) >> 16);
215 if (ext4_sb_get_desc_size(s) > EXT4_MIN_BLOCK_GROUP_DESCRIPTOR_SIZE)
216 bg->itable_unused_hi = to_le16(cnt >> 16);
219 /**@brief Set checksum of block group.
220 * @param bg Pointer to block group
221 * @param crc Cheksum of block group
223 static inline void ext4_bg_set_checksum(struct ext4_bgroup *bg,
226 bg->checksum = to_le16(crc);
229 /**@brief Check if block group has a flag.
230 * @param bg Pointer to block group
231 * @param flag Flag to be checked
232 * @return True if flag is set to 1
234 static inline bool ext4_bg_has_flag(struct ext4_bgroup *bg, uint32_t f)
236 return to_le16(bg->flags) & f;
239 /**@brief Set flag of block group.
240 * @param bg Pointer to block group
241 * @param flag Flag to be set
243 static inline void ext4_bg_set_flag(struct ext4_bgroup *bg, uint32_t f)
245 uint16_t flags = to_le16(bg->flags);
247 bg->flags = to_le16(flags);
250 /**@brief Clear flag of block group.
251 * @param bg Pointer to block group
252 * @param flag Flag to be cleared
254 static inline void ext4_bg_clear_flag(struct ext4_bgroup *bg, uint32_t f)
256 uint16_t flags = to_le16(bg->flags);
258 bg->flags = to_le16(flags);
261 /**@brief Calculate CRC16 of the block group.
262 * @param crc Init value
263 * @param buffer Input buffer
264 * @param len Sizeof input buffer
265 * @return Computed CRC16*/
266 uint16_t ext4_bg_crc16(uint16_t crc, const uint8_t *buffer, size_t len);
268 #endif /* EXT4_BLOCK_GROUP_H_ */