source: mainline/uspace/lib/ext4/libext4_inode.c@ ebeaaa06

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since ebeaaa06 was 343ccfd, checked in by Frantisek Princ <frantisek.princ@…>, 14 years ago

next bunch of getters and setters added
  • Property mode set to 100644
File size: 10.7 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
238uint64_t ext4_get_inode_file_acl(ext4_inode_t *inode, ext4_superblock_t *sb)
239{
240 if (ext4_superblock_get_creator_os(sb) == EXT4_SUPERBLOCK_OS_LINUX) {
241 return ((uint32_t)uint16_t_le2host(inode->osd2.linux2.file_acl_high)) << 16 |
242 (uint32_t_le2host(inode->file_acl_lo));
243 }
244
245 return uint32_t_le2host(inode->file_acl_lo);
246}
247
248void ext4_set_inode_file_acl(ext4_inode_t *inode, ext4_superblock_t *sb,
249 uint64_t file_acl)
250{
251 inode->file_acl_lo = host2uint32_t_le((file_acl << 32) >> 32);
252
253 if (ext4_superblock_get_creator_os(sb) == EXT4_SUPERBLOCK_OS_LINUX) {
254 inode->osd2.linux2.file_acl_high = host2uint16_t_le(file_acl >> 32);
255 }
256}
257
258/***********************************************************************/
259
260uint32_t ext4_inode_get_direct_block(ext4_inode_t *inode, uint32_t idx)
261{
262 assert(idx < EXT4_INODE_DIRECT_BLOCK_COUNT);
263 return uint32_t_le2host(inode->blocks[idx]);
264}
265
266void ext4_inode_set_direct_block(ext4_inode_t *inode, uint32_t idx, uint32_t fblock)
267{
268 assert(idx < EXT4_INODE_DIRECT_BLOCK_COUNT);
269 inode->blocks[idx] = host2uint32_t_le(fblock);
270}
271
272uint32_t ext4_inode_get_indirect_block(ext4_inode_t *inode, uint32_t idx)
273{
274 return uint32_t_le2host(inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK]);
275}
276
277void ext4_inode_set_indirect_block(ext4_inode_t *inode, uint32_t idx, uint32_t fblock)
278{
279 inode->blocks[idx + EXT4_INODE_INDIRECT_BLOCK] = host2uint32_t_le(fblock);
280}
281
282
283uint32_t ext4_inode_get_extent_block(ext4_inode_t *inode, uint64_t idx, service_id_t service_id)
284{
285 ext4_extent_header_t *header = ext4_inode_get_extent_header(inode);
286 ext4_extent_t *extent;
287 ext4_extent_index_t *extent_index;
288
289 uint32_t first_block;
290 uint16_t block_count;
291 uint64_t phys_block = 0;
292 uint64_t child;
293
294 int rc;
295 block_t* block = NULL;
296
297 while (ext4_extent_header_get_depth(header) != 0) {
298
299 extent_index = EXT4_EXTENT_FIRST_INDEX(header);
300
301 for (uint16_t i = 0; i < ext4_extent_header_get_entries_count(header); ++i) {
302 if(idx >= ext4_extent_index_get_first_block(extent_index)) {
303
304 child = ext4_extent_index_get_leaf(extent_index);
305
306 if (block != NULL) {
307 block_put(block);
308 }
309
310 rc = block_get(&block, service_id, child, BLOCK_FLAGS_NONE);
311 if (rc != EOK) {
312 return 0;
313 }
314
315 header = (ext4_extent_header_t *)block->data;
316 break;
317 }
318 }
319 }
320
321 extent = EXT4_EXTENT_FIRST(header);
322
323 for (uint16_t i = 0; i < ext4_extent_header_get_entries_count(header); ++i) {
324
325 first_block = ext4_extent_get_first_block(extent);
326 block_count = ext4_extent_get_block_count(extent);
327
328 if ((idx >= first_block) && (idx < first_block + block_count)) {
329 phys_block = ext4_extent_get_start(extent) + idx;
330 phys_block -= ext4_extent_get_first_block(extent);
331
332 // Memory leak prevention
333 if (block != NULL) {
334 block_put(block);
335 }
336 return phys_block;
337 }
338 // Go to the next extent
339 ++extent;
340 }
341
342
343 EXT4FS_DBG("ERROR - reached function end");
344 return phys_block;
345}
346
347bool ext4_inode_is_type(ext4_superblock_t *sb, ext4_inode_t *inode, uint32_t type)
348{
349 uint32_t mode = ext4_inode_get_mode(sb, inode);
350 return (mode & EXT4_INODE_MODE_TYPE_MASK) == type;
351}
352
353
354ext4_extent_header_t * ext4_inode_get_extent_header(ext4_inode_t *inode)
355{
356 return (ext4_extent_header_t *)inode->blocks;
357}
358
359// Flags operations
360bool ext4_inode_has_flag(ext4_inode_t *inode, uint32_t flag)
361{
362 if (ext4_inode_get_flags(inode) & flag) {
363 return true;
364 }
365 return false;
366}
367
368void ext4_inode_clear_flag(ext4_inode_t *inode, uint32_t clear_flag)
369{
370 uint32_t flags = ext4_inode_get_flags(inode);
371 flags = flags & (~clear_flag);
372 ext4_inode_set_flags(inode, flags);
373}
374
375void ext4_inode_set_flag(ext4_inode_t *inode, uint32_t set_flag)
376{
377 uint32_t flags = ext4_inode_get_flags(inode);
378 flags = flags | set_flag;
379 ext4_inode_set_flags(inode, flags);
380}
381
382bool ext4_inode_can_truncate(ext4_superblock_t *sb, ext4_inode_t *inode)
383{
384 if (ext4_inode_has_flag(inode, EXT4_INODE_FLAG_APPEND)
385 || ext4_inode_has_flag(inode, EXT4_INODE_FLAG_IMMUTABLE)) {
386 return false;
387 }
388
389 if (ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_FILE)
390 || ext4_inode_is_type(sb, inode, EXT4_INODE_MODE_DIRECTORY)) {
391 return true;
392 }
393
394 return false;
395}
396
397/**
398 * @}
399 */
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