source: mainline/uspace/lib/ext4/libext4_inode.c@ fe27eb4

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since fe27eb4 was fe27eb4, checked in by Frantisek Princ <frantisek.princ@…>, 14 years ago

added many getters and setters
  • Property mode set to 100644
File size: 10.1 KB
Line 
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_inode.c
35 * @brief Ext4 inode structure operations.
36 */
37
38#include <byteorder.h>
39#include <errno.h>
40#include <libblock.h>
41#include "libext4.h"
42
43static uint32_t ext4_inode_block_bits_count(uint32_t block_size)
44{
45 uint32_t bits = 8;
46 uint32_t size = block_size;
47
48 do {
49 bits++;
50 size = size >> 1;
51 } while (size > 256);
52
53 return bits;
54}
55
56uint32_t ext4_inode_get_mode(ext4_superblock_t *sb, ext4_inode_t *inode)
57{
58 if (ext4_superblock_get_creator_os(sb) == EXT4_SUPERBLOCK_OS_HURD) {
59 return ((uint32_t)uint16_t_le2host(inode->osd2.hurd2.mode_high)) << 16 |
60 ((uint32_t)uint16_t_le2host(inode->mode));
61 }
62 return uint16_t_le2host(inode->mode);
63}
64
65void ext4_inode_set_mode(ext4_superblock_t *sb, ext4_inode_t *inode, uint32_t mode)
66{
67 inode->mode = host2uint16_t_le((mode << 16) >> 16);
68
69 if (ext4_superblock_get_creator_os(sb) == EXT4_SUPERBLOCK_OS_HURD) {
70 inode->osd2.hurd2.mode_high = host2uint16_t_le(mode >> 16);
71 }
72}
73
74uint32_t ext4_inode_get_uid(ext4_inode_t *inode)
75{
76 return uint32_t_le2host(inode->uid);
77}
78
79void ext4_inode_set_uid(ext4_inode_t *inode, uint32_t uid)
80{
81 inode->uid = host2uint32_t_le(uid);
82}
83
84uint64_t ext4_inode_get_size(ext4_superblock_t *sb, ext4_inode_t *inode)
85{
86 uint32_t major_rev = ext4_superblock_get_rev_level(sb);
87
88 if ((major_rev > 0) && ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_FILE)) {
89 return ((uint64_t)uint32_t_le2host(inode->size_hi)) << 32 |
90 ((uint64_t)uint32_t_le2host(inode->size_lo));
91 }
92 return uint32_t_le2host(inode->size_lo);
93}
94
95void ext4_inode_set_size(ext4_inode_t *inode, uint64_t value) {
96 inode->size_lo = host2uint32_t_le((value << 32) >> 32);
97 inode->size_hi = host2uint32_t_le(value >> 32);
98}
99
100uint32_t ext4_inode_get_access_time(ext4_inode_t *inode)
101{
102 return uint32_t_le2host(inode->access_time);
103}
104
105void ext4_inode_set_access_time(ext4_inode_t *inode, uint32_t time)
106{
107 inode->access_time = host2uint32_t_le(time);
108}
109
110uint32_t ext4_inode_get_change_inode_time(ext4_inode_t *inode)
111{
112 return uint32_t_le2host(inode->change_inode_time);
113}
114
115void ext4_inode_set_change_inode_time(ext4_inode_t *inode, uint32_t time)
116{
117 inode->change_inode_time = host2uint32_t_le(time);
118}
119
120uint32_t ext4_inode_get_modification_time(ext4_inode_t *inode)
121{
122 return uint32_t_le2host(inode->modification_time);
123}
124
125void ext4_inode_set_modification_time(ext4_inode_t *inode, uint32_t time)
126{
127 inode->modification_time = host2uint32_t_le(time);
128}
129
130uint32_t ext4_inode_get_deletion_time(ext4_inode_t *inode)
131{
132 return uint32_t_le2host(inode->deletion_time);
133}
134
135void ext4_inode_set_deletion_time(ext4_inode_t *inode, uint32_t time)
136{
137 inode->deletion_time = host2uint32_t_le(time);
138}
139
140uint32_t ext4_inode_get_gid(ext4_inode_t *inode)
141{
142 return uint32_t_le2host(inode->gid);
143}
144
145void ext4_inode_set_gid(ext4_inode_t *inode, uint32_t gid)
146{
147 inode->gid = host2uint32_t_le(gid);
148}
149
150uint16_t ext4_inode_get_links_count(ext4_inode_t *inode)
151{
152 return uint16_t_le2host(inode->links_count);
153}
154
155void ext4_inode_set_links_count(ext4_inode_t *inode, uint16_t count)
156{
157 inode->links_count = host2uint16_t_le(count);
158}
159
160uint64_t ext4_inode_get_blocks_count(ext4_superblock_t *sb, ext4_inode_t *inode)
161{
162 uint64_t count;
163
164 if (ext4_superblock_has_feature_read_only(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
165
166 /* 48-bit field */
167 count = ((uint64_t)uint16_t_le2host(inode->osd2.linux2.blocks_high)) << 32 |
168 uint32_t_le2host(inode->blocks_count_lo);
169
170 if (ext4_inode_has_flag(inode, EXT4_INODE_FLAG_HUGE_FILE)) {
171 uint32_t block_size = ext4_superblock_get_block_size(sb);
172 uint32_t block_bits = ext4_inode_block_bits_count(block_size);
173 return count << (block_bits - 9);
174 } else {
175 return count;
176 }
177 } else {
178 return uint32_t_le2host(inode->blocks_count_lo);
179 }
180
181}
182
183int ext4_inode_set_blocks_count(ext4_superblock_t *sb, ext4_inode_t *inode,
184 uint64_t count)
185{
186 // 32-bit maximum
187 uint64_t max = 0;
188 max = ~max >> 32;
189
190 if (count <= max) {
191 inode->blocks_count_lo = host2uint32_t_le(count);
192 inode->osd2.linux2.blocks_high = 0;
193 ext4_inode_clear_flag(inode, EXT4_INODE_FLAG_HUGE_FILE);
194 return EOK;
195 }
196
197 if (!ext4_superblock_has_feature_read_only(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
198 return EINVAL;
199 }
200
201 // 48-bit maximum
202 max = 0;
203 max = ~max >> 16;
204
205 if (count <= max) {
206 inode->blocks_count_lo = host2uint32_t_le(count);
207 inode->osd2.linux2.blocks_high = host2uint16_t_le(count >> 32);
208 ext4_inode_clear_flag(inode, EXT4_INODE_FLAG_HUGE_FILE);
209 } else {
210 uint32_t block_size = ext4_superblock_get_block_size(sb);
211 uint32_t block_bits = ext4_inode_block_bits_count(block_size);
212 ext4_inode_set_flag(inode, EXT4_INODE_FLAG_HUGE_FILE);
213 count = count >> (block_bits - 9);
214 inode->blocks_count_lo = host2uint32_t_le(count);
215 inode->osd2.linux2.blocks_high = host2uint16_t_le(count >> 32);
216 }
217 return EOK;
218}
219
220uint32_t ext4_inode_get_flags(ext4_inode_t *inode) {
221 return uint32_t_le2host(inode->flags);
222}
223
224void ext4_inode_set_flags(ext4_inode_t *inode, uint32_t flags) {
225 inode->flags = host2uint32_t_le(flags);
226}
227
228uint32_t ext4_inode_get_generation(ext4_inode_t *inode)
229{
230 return uint32_t_le2host(inode->generation);
231}
232
233void ext4_inode_set_generation(ext4_inode_t *inode, uint32_t generation)
234{
235 inode->generation = host2uint32_t_le(generation);
236}
237
238/***********************************************************************/
239
240uint32_t ext4_inode_get_direct_block(ext4_inode_t *inode, uint32_t idx)
241{
242 assert(idx < EXT4_INODE_DIRECT_BLOCK_COUNT);
243 return uint32_t_le2host(inode->blocks[idx]);
244}
245
246void ext4_inode_set_direct_block(ext4_inode_t *inode, uint32_t idx, uint32_t fblock)
247{
248 assert(idx < EXT4_INODE_DIRECT_BLOCK_COUNT);
249 inode->blocks[idx] = host2uint32_t_le(fblock);
250}
251
252uint32_t ext4_inode_get_indirect_block(ext4_inode_t *inode, uint32_t idx)
253{
254 return uint32_t_le2host(inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK]);
255}
256
257void ext4_inode_set_indirect_block(ext4_inode_t *inode, uint32_t idx, uint32_t fblock)
258{
259 inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK] = host2uint32_t_le(fblock);
260}
261
262
263uint32_t ext4_inode_get_extent_block(ext4_inode_t *inode, uint64_t idx, service_id_t service_id)
264{
265 ext4_extent_header_t *header = ext4_inode_get_extent_header(inode);
266 ext4_extent_t *extent;
267 ext4_extent_index_t *extent_index;
268
269 uint32_t first_block;
270 uint16_t block_count;
271 uint64_t phys_block = 0;
272 uint64_t child;
273
274 int rc;
275 block_t* block = NULL;
276
277 while (ext4_extent_header_get_depth(header) != 0) {
278
279 extent_index = EXT4_EXTENT_FIRST_INDEX(header);
280
281 for (uint16_t i = 0; i < ext4_extent_header_get_entries_count(header); ++i) {
282 if(idx >= ext4_extent_index_get_first_block(extent_index)) {
283
284 child = ext4_extent_index_get_leaf(extent_index);
285
286 if (block != NULL) {
287 block_put(block);
288 }
289
290 rc = block_get(&block, service_id, child, BLOCK_FLAGS_NONE);
291 if (rc != EOK) {
292 return 0;
293 }
294
295 header = (ext4_extent_header_t *)block->data;
296 break;
297 }
298 }
299 }
300
301 extent = EXT4_EXTENT_FIRST(header);
302
303 for (uint16_t i = 0; i < ext4_extent_header_get_entries_count(header); ++i) {
304
305 first_block = ext4_extent_get_first_block(extent);
306 block_count = ext4_extent_get_block_count(extent);
307
308 if ((idx >= first_block) && (idx < first_block + block_count)) {
309 phys_block = ext4_extent_get_start(extent) + idx;
310 phys_block -= ext4_extent_get_first_block(extent);
311
312 // Memory leak prevention
313 if (block != NULL) {
314 block_put(block);
315 }
316 return phys_block;
317 }
318 // Go to the next extent
319 ++extent;
320 }
321
322
323 EXT4FS_DBG("ERROR - reached function end");
324 return phys_block;
325}
326
327bool ext4_inode_is_type(ext4_superblock_t *sb, ext4_inode_t *inode, uint32_t type)
328{
329 uint32_t mode = ext4_inode_get_mode(sb, inode);
330 return (mode & EXT4_INODE_MODE_TYPE_MASK) == type;
331}
332
333
334ext4_extent_header_t * ext4_inode_get_extent_header(ext4_inode_t *inode)
335{
336 return (ext4_extent_header_t *)inode->blocks;
337}
338
339// Flags operations
340bool ext4_inode_has_flag(ext4_inode_t *inode, uint32_t flag)
341{
342 if (ext4_inode_get_flags(inode) & flag) {
343 return true;
344 }
345 return false;
346}
347
348void ext4_inode_clear_flag(ext4_inode_t *inode, uint32_t clear_flag)
349{
350 uint32_t flags = ext4_inode_get_flags(inode);
351 flags = flags & (~clear_flag);
352 ext4_inode_set_flags(inode, flags);
353}
354
355void ext4_inode_set_flag(ext4_inode_t *inode, uint32_t set_flag)
356{
357 uint32_t flags = ext4_inode_get_flags(inode);
358 flags = flags | set_flag;
359 ext4_inode_set_flags(inode, flags);
360}
361
362bool ext4_inode_can_truncate(ext4_superblock_t *sb, ext4_inode_t *inode)
363{
364 if (ext4_inode_has_flag(inode, EXT4_INODE_FLAG_APPEND)
365 || ext4_inode_has_flag(inode, EXT4_INODE_FLAG_IMMUTABLE)) {
366 return false;
367 }
368
369 if (ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_FILE)
370 || ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_DIRECTORY)) {
371 return true;
372 }
373
374 return false;
375}
376
377/**
378 * @}
379 */
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