source: mainline/uspace/lib/ext4/libext4_block_group.c@ 3d93289a

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 3d93289a was 3d93289a, checked in by Frantisek Princ <frantisek.princ@…>, 13 years ago

comments for block group functions
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File size: 10.6 KB
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1/*
2 * Copyright (c) 2011 Frantisek Princ
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libext4
30 * @{
31 */
32
33/**
34 * @file libext4_block_group.c
35 * @brief Ext4 block group structure operations
36 */
37
38#include <byteorder.h>
39#include "libext4.h"
40
41/** Get address of block with data block bitmap.
42 *
43 * @param bg pointer to block group
44 * @param sb pointer to superblock
45 * @return address of block with block bitmap
46 */
47uint64_t ext4_block_group_get_block_bitmap(ext4_block_group_t *bg,
48 ext4_superblock_t *sb)
49{
50 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
51 return ((uint64_t)uint32_t_le2host(bg->block_bitmap_hi) << 32) |
52 uint32_t_le2host(bg->block_bitmap_lo);
53 } else {
54 return uint32_t_le2host(bg->block_bitmap_lo);
55 }
56}
57
58/** Set address of block with data block bitmap.
59 *
60 * @param bg pointer to block group
61 * @param sb pointer to superblock
62 * @param block_bitmap address of block with block bitmap
63 */
64void ext4_block_group_set_block_bitmap(ext4_block_group_t *bg,
65 ext4_superblock_t *sb, uint64_t block_bitmap)
66{
67 bg->block_bitmap_lo = host2uint32_t_le((block_bitmap << 32) >> 32);
68
69 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
70 bg->block_bitmap_hi = host2uint32_t_le(block_bitmap >> 32);
71 }
72}
73
74/** Get address of block with i-node bitmap.
75 *
76 * @param bg pointer to block group
77 * @param sb pointer to superblock
78 * @return address of block with i-node bitmap
79 */
80uint64_t ext4_block_group_get_inode_bitmap(ext4_block_group_t *bg,
81 ext4_superblock_t *sb)
82{
83 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
84 return ((uint64_t)uint32_t_le2host(bg->inode_bitmap_hi) << 32) |
85 uint32_t_le2host(bg->inode_bitmap_lo);
86 } else {
87 return uint32_t_le2host(bg->inode_bitmap_lo);
88 }
89
90}
91
92/** Set address of block with i-node bitmap.
93 *
94 * @param bg pointer to block group
95 * @param sb pointer to superblock
96 * @param inode_bitmap address of block with i-node bitmap
97 */
98void ext4_block_group_set_inode_bitmap(ext4_block_group_t *bg,
99 ext4_superblock_t *sb, uint64_t inode_bitmap)
100{
101 bg->inode_bitmap_lo = host2uint32_t_le((inode_bitmap << 32) >> 32);
102
103 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
104 bg->inode_bitmap_hi = host2uint32_t_le(inode_bitmap >> 32);
105 }
106}
107
108/** Get address of the first block of the i-node table.
109 *
110 * @param bg pointer to block group
111 * @param sb pointer to superblock
112 * @return address of first block of i-node table
113 */
114uint64_t ext4_block_group_get_inode_table_first_block(ext4_block_group_t *bg,
115 ext4_superblock_t *sb)
116{
117 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
118 return ((uint64_t)uint32_t_le2host(bg->inode_table_first_block_hi) << 32) |
119 uint32_t_le2host(bg->inode_table_first_block_lo);
120 } else {
121 return uint32_t_le2host(bg->inode_table_first_block_lo);
122 }
123}
124
125/** Set address of the first block of the i-node table.
126 *
127 * @param bg pointer to block group
128 * @param sb pointer to superblock
129 * @param inode_table_first address of first block of i-node table
130 */
131void ext4_block_group_set_inode_table_first_block(ext4_block_group_t *bg,
132 ext4_superblock_t *sb, uint64_t inode_table_first)
133{
134 bg->inode_table_first_block_lo =
135 host2uint32_t_le((inode_table_first << 32) >> 32);
136
137 if (ext4_superblock_get_desc_size(sb) >
138 EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
139
140 bg->inode_table_first_block_hi =
141 host2uint32_t_le(inode_table_first >> 32);
142 }
143}
144
145/** Get number of free blocks in block group.
146 *
147 * @param bg pointer to block group
148 * @param sb pointer to superblock
149 * @return number of free blocks in block group
150 */
151uint32_t ext4_block_group_get_free_blocks_count(ext4_block_group_t *bg,
152 ext4_superblock_t *sb)
153{
154 if (ext4_superblock_get_desc_size(sb) >
155 EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
156
157 return ((uint32_t)uint16_t_le2host(bg->free_blocks_count_hi) << 16) |
158 uint16_t_le2host(bg->free_blocks_count_lo);
159 } else {
160 return uint16_t_le2host(bg->free_blocks_count_lo);
161 }
162}
163
164/** Set number of free blocks in block group.
165 *
166 * @param bg pointer to block group
167 * @param sb pointer to superblock
168 * @param value number of free blocks in block group
169 */
170void ext4_block_group_set_free_blocks_count(ext4_block_group_t *bg,
171 ext4_superblock_t *sb, uint32_t value)
172{
173 bg->free_blocks_count_lo = host2uint16_t_le((value << 16) >> 16);
174 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
175 bg->free_blocks_count_hi = host2uint16_t_le(value >> 16);
176 }
177}
178
179/** Get number of free i-nodes in block group.
180 *
181 * @param bg pointer to block group
182 * @param sb pointer to superblock
183 * @return number of free i-nodes in block group
184 */
185uint32_t ext4_block_group_get_free_inodes_count(ext4_block_group_t *bg,
186 ext4_superblock_t *sb)
187{
188 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
189 return ((uint32_t)uint16_t_le2host(bg->free_inodes_count_hi) << 16) |
190 uint16_t_le2host(bg->free_inodes_count_lo);
191 } else {
192 return uint16_t_le2host(bg->free_inodes_count_lo);
193 }
194}
195
196/** Set number of free i-nodes in block group.
197 *
198 * @param bg pointer to block group
199 * @param sb pointer to superblock
200 * @param value number of free i-nodes in block group
201 */
202void ext4_block_group_set_free_inodes_count(ext4_block_group_t *bg,
203 ext4_superblock_t *sb, uint32_t value)
204{
205 bg->free_inodes_count_lo = host2uint16_t_le((value << 16) >> 16);
206 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
207 bg->free_inodes_count_hi = host2uint16_t_le(value >> 16);
208 }
209}
210
211/** Get number of used directories in block group.
212 *
213 * @param bg pointer to block group
214 * @param sb pointer to superblock
215 * @return number of used directories in block group
216 */
217uint32_t ext4_block_group_get_used_dirs_count(ext4_block_group_t *bg,
218 ext4_superblock_t *sb)
219{
220 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
221 return ((uint32_t)uint16_t_le2host(bg->used_dirs_count_hi) << 16) |
222 uint16_t_le2host(bg->used_dirs_count_lo);
223 } else {
224 return uint16_t_le2host(bg->used_dirs_count_lo);
225 }
226}
227
228/** Set number of used directories in block group.
229 *
230 * @param bg pointer to block group
231 * @param sb pointer to superblock
232 * @param value number of used directories in block group
233 */
234void ext4_block_group_set_used_dirs_count(ext4_block_group_t *bg,
235 ext4_superblock_t *sb, uint32_t count)
236{
237 bg->used_dirs_count_lo = host2uint16_t_le((count << 16) >> 16);
238 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
239 bg->used_dirs_count_hi = host2uint16_t_le(count >> 16);
240 }
241}
242
243/** Get flags of block group.
244 *
245 * @param bg pointer to block group
246 * @return flags of block group
247 */
248uint16_t ext4_block_group_get_flags(ext4_block_group_t *bg)
249{
250 return uint16_t_le2host(bg->flags);
251}
252
253/** Set flags for block group.
254 *
255 * @param bg pointer to block group
256 * @param flags flags for block group
257 */
258void ext4_block_group_set_flags(ext4_block_group_t *bg, uint16_t flags)
259{
260 bg->flags = host2uint16_t_le(flags);
261}
262
263/** Get number of unused i-nodes.
264 *
265 * @param bg pointer to block group
266 * @param sb pointer to superblock
267 * @return number of unused i-nodes
268 */
269uint32_t ext4_block_group_get_itable_unused(ext4_block_group_t *bg,
270 ext4_superblock_t *sb)
271{
272 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
273 return ((uint32_t)uint16_t_le2host(bg->itable_unused_hi) << 16) |
274 uint16_t_le2host(bg->itable_unused_lo);
275 } else {
276 return uint16_t_le2host(bg->itable_unused_lo);
277 }
278}
279
280/** Set number of unused i-nodes.
281 *
282 * @param bg pointer to block group
283 * @param sb pointer to superblock
284 * @param value number of unused i-nodes
285 */
286void ext4_block_group_set_itable_unused(ext4_block_group_t *bg,
287 ext4_superblock_t *sb, uint32_t value)
288{
289 bg->itable_unused_lo = host2uint16_t_le((value << 16) >> 16);
290 if (ext4_superblock_get_desc_size(sb) > EXT4_BLOCK_MIN_GROUP_DESCRIPTOR_SIZE) {
291 bg->itable_unused_hi = host2uint16_t_le(value >> 16);
292 }
293
294}
295
296/** Get checksum of block group.
297 *
298 * @param bg pointer to block group
299 * @return checksum of block group
300 */
301uint16_t ext4_block_group_get_checksum(ext4_block_group_t *bg)
302{
303 return uint16_t_le2host(bg->checksum);
304}
305
306/** Set checksum of block group.
307 *
308 * @param bg pointer to block group
309 * @param checksum cheksum of block group
310 */
311void ext4_block_group_set_checksum(ext4_block_group_t *bg, uint16_t checksum)
312{
313 bg->checksum = host2uint16_t_le(checksum);
314}
315
316/** Check if block group has a flag.
317 *
318 * @param bg pointer to block group
319 * @param flag flag to be checked
320 * @return true if flag is set to 1
321 */
322bool ext4_block_group_has_flag(ext4_block_group_t *bg, uint32_t flag)
323{
324 if (ext4_block_group_get_flags(bg) & flag) {
325 return true;
326 }
327 return false;
328}
329
330/** Set (add) flag of block group.
331 *
332 * @param bg pointer to block group
333 * @param flag flag to be set
334 */
335void ext4_block_group_set_flag(ext4_block_group_t *bg, uint32_t set_flag)
336{
337 uint32_t flags = ext4_block_group_get_flags(bg);
338 flags = flags | set_flag;
339 ext4_block_group_set_flags(bg, flags);
340}
341
342/** Clear (remove) flag of block group.
343 *
344 * @param bg pointer to block group
345 * @param flag flag to be cleared
346 */
347void ext4_block_group_clear_flag(ext4_block_group_t *bg, uint32_t clear_flag)
348{
349 uint32_t flags = ext4_block_group_get_flags(bg);
350 flags = flags & (~clear_flag);
351 ext4_block_group_set_flags(bg, flags);
352}
353
354
355/**
356 * @}
357 */
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