source: mainline/uspace/srv/fs/minixfs/mfs_inode.c@ b2a18234

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since b2a18234 was b2a18234, checked in by Maurizio Lombardi <m.lombardi85@…>, 14 years ago

Remove the inode_grow() function and fix support to sparse files
  • Property mode set to 100644
File size: 8.6 KB
Line 
1/*
2 * Copyright (c) 2011 Maurizio Lombardi
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 fs
30 * @{
31 */
32
33#include <stdlib.h>
34#include "mfs.h"
35
36static int
37mfs_write_inode_raw(struct mfs_node *mnode);
38
39static int
40mfs2_write_inode_raw(struct mfs_node *mnode);
41
42static struct mfs_ino_info *
43mfs_read_inode_raw(const struct mfs_instance *instance, uint16_t inum);
44
45static struct mfs_ino_info *
46mfs2_read_inode_raw(const struct mfs_instance *instance, uint32_t inum);
47
48
49int
50get_inode(struct mfs_instance *inst, struct mfs_ino_info **ino_i,
51 fs_index_t index)
52{
53 struct mfs_sb_info *sbi = inst->sbi;
54
55 if (sbi->fs_version == MFS_VERSION_V1) {
56 /*Read a MFS V1 inode*/
57 *ino_i = mfs_read_inode_raw(inst, index);
58 } else {
59 /*Read a MFS V2/V3 inode*/
60 *ino_i = mfs2_read_inode_raw(inst, index);
61 }
62
63 if (*ino_i == NULL)
64 return -1;
65
66 return EOK;
67}
68
69static struct mfs_ino_info *
70mfs_read_inode_raw(const struct mfs_instance *instance, uint16_t inum) {
71 struct mfs_inode *ino = NULL;
72 struct mfs_ino_info *ino_i = NULL;
73 struct mfs_sb_info *sbi;
74 block_t *b;
75 int i;
76
77 sbi = instance->sbi;
78 assert(sbi);
79
80 /*inode 0 does not exist*/
81 inum -= 1;
82
83 const int ino_off = inum % sbi->ino_per_block;
84 const size_t ino_size = sizeof(struct mfs_inode);
85
86 ino_i = malloc(sizeof(*ino_i));
87 ino = malloc(ino_size);
88
89 if (!ino || !ino_i)
90 goto out_err;
91
92 const int itable_off = sbi->itable_off;
93
94 if (block_get(&b, instance->handle,
95 itable_off + inum / sbi->ino_per_block,
96 BLOCK_FLAGS_NONE) != EOK)
97 goto out_err;
98
99 memcpy(ino, ((uint8_t *) b->data) + ino_off * ino_size, ino_size);
100
101 ino_i->i_mode = conv16(sbi->native, ino->i_mode);
102 ino_i->i_uid = conv16(sbi->native, ino->i_uid);
103 ino_i->i_size = conv32(sbi->native, ino->i_size);
104 ino_i->i_mtime = conv32(sbi->native, ino->i_mtime);
105 ino_i->i_nlinks = ino->i_nlinks;
106
107 for (i = 0; i < V1_NR_DIRECT_ZONES; ++i)
108 ino_i->i_dzone[i] = conv16(sbi->native, ino->i_dzone[i]);
109
110 for (i = 0; i < V1_NR_INDIRECT_ZONES; ++i)
111 ino_i->i_izone[i] = conv16(sbi->native, ino->i_izone[i]);
112
113 block_put(b);
114 free(ino);
115 ino_i->dirty = false;
116
117 return ino_i;
118
119out_err:
120 if (ino)
121 free(ino);
122 if (ino_i)
123 free(ino_i);
124 return NULL;
125}
126
127static struct mfs_ino_info *
128mfs2_read_inode_raw(const struct mfs_instance *instance, uint32_t inum) {
129 struct mfs2_inode *ino = NULL;
130 struct mfs_ino_info *ino_i = NULL;
131 struct mfs_sb_info *sbi;
132 block_t *b;
133 int i;
134
135 const size_t ino_size = sizeof(struct mfs2_inode);
136
137 ino = malloc(ino_size);
138 ino_i = malloc(sizeof(*ino_i));
139
140 if (!ino || !ino_i)
141 goto out_err;
142
143 sbi = instance->sbi;
144 assert(sbi);
145
146 /*inode 0 does not exist*/
147 inum -= 1;
148
149 const int itable_off = sbi->itable_off;
150 const int ino_off = inum % sbi->ino_per_block;
151
152 if (block_get(&b, instance->handle,
153 itable_off + inum / sbi->ino_per_block,
154 BLOCK_FLAGS_NONE) != EOK)
155 goto out_err;
156
157 memcpy(ino, b->data + ino_off * ino_size, ino_size);
158
159 ino_i->i_mode = conv16(sbi->native, ino->i_mode);
160 ino_i->i_nlinks = conv16(sbi->native, ino->i_nlinks);
161 ino_i->i_uid = conv16(sbi->native, ino->i_uid);
162 ino_i->i_gid = conv16(sbi->native, ino->i_gid);
163 ino_i->i_size = conv32(sbi->native, ino->i_size);
164 ino_i->i_atime = conv32(sbi->native, ino->i_atime);
165 ino_i->i_mtime = conv32(sbi->native, ino->i_mtime);
166 ino_i->i_ctime = conv32(sbi->native, ino->i_ctime);
167
168 for (i = 0; i < V2_NR_DIRECT_ZONES; ++i)
169 ino_i->i_dzone[i] = conv32(sbi->native, ino->i_dzone[i]);
170
171 for (i = 0; i < V2_NR_INDIRECT_ZONES; ++i)
172 ino_i->i_izone[i] = conv32(sbi->native, ino->i_izone[i]);
173
174 block_put(b);
175 free(ino);
176 ino_i->dirty = false;
177
178 return ino_i;
179
180out_err:
181 if (ino)
182 free(ino);
183 if (ino_i)
184 free(ino_i);
185 return NULL;
186}
187
188int
189put_inode(struct mfs_node *mnode)
190{
191 int rc = EOK;
192
193 assert(mnode);
194 assert(mnode->ino_i);
195
196 if (!mnode->ino_i->dirty)
197 goto out;
198
199 struct mfs_instance *inst = mnode->instance;
200 assert(inst);
201 struct mfs_sb_info *sbi = inst->sbi;
202 assert(sbi);
203
204 if (sbi->fs_version == MFS_VERSION_V1)
205 rc = mfs_write_inode_raw(mnode);
206 else
207 rc = mfs2_write_inode_raw(mnode);
208
209out:
210 return rc;
211}
212
213static int
214mfs_write_inode_raw(struct mfs_node *mnode)
215{
216 int i, r;
217 block_t *b;
218 struct mfs_ino_info *ino_i = mnode->ino_i;
219 struct mfs_sb_info *sbi = mnode->instance->sbi;
220
221 const uint32_t inum = ino_i->index - 1;
222 const int itable_off = sbi->itable_off;
223 const int ino_off = inum % sbi->ino_per_block;
224 const bool native = sbi->native;
225
226 r = block_get(&b, mnode->instance->handle,
227 itable_off + inum / sbi->ino_per_block,
228 BLOCK_FLAGS_NONE);
229
230 on_error(r, goto out);
231
232 struct mfs_inode *ino = b->data;
233 ino += ino_off;
234
235 ino->i_mode = conv16(native, ino_i->i_mode);
236 ino->i_uid = conv16(native, ino_i->i_uid);
237 ino->i_gid = ino_i->i_gid;
238 ino->i_nlinks = ino_i->i_nlinks;
239 ino->i_size = conv32(native, ino_i->i_size);
240 ino->i_mtime = conv32(native, ino_i->i_mtime);
241
242 for (i = 0; i < V1_NR_DIRECT_ZONES; ++i)
243 ino->i_dzone[i] = conv16(native, ino_i->i_dzone[i]);
244 for (i = 0; i < V1_NR_INDIRECT_ZONES; ++i)
245 ino->i_izone[i] = conv16(native, ino_i->i_izone[i]);
246
247 b->dirty = true;
248 block_put(b);
249
250 ino_i->dirty = false;
251out:
252 return r;
253}
254
255static int
256mfs2_write_inode_raw(struct mfs_node *mnode)
257{
258 struct mfs_ino_info *ino_i = mnode->ino_i;
259 struct mfs_sb_info *sbi = mnode->instance->sbi;
260 block_t *b;
261 int i, r;
262
263 const uint32_t inum = ino_i->index - 1;
264 const int itable_off = sbi->itable_off;
265 const int ino_off = inum % sbi->ino_per_block;
266 const bool native = sbi->native;
267
268 r = block_get(&b, mnode->instance->handle,
269 itable_off + inum / sbi->ino_per_block,
270 BLOCK_FLAGS_NONE);
271
272 on_error(r, goto out);
273
274 struct mfs2_inode *ino2 = b->data;
275 ino2 += ino_off;
276
277 ino2->i_mode = conv16(native, ino_i->i_mode);
278 ino2->i_nlinks = conv16(native, ino_i->i_nlinks);
279 ino2->i_uid = conv16(native, ino_i->i_uid);
280 ino2->i_gid = conv16(native, ino_i->i_gid);
281 ino2->i_size = conv32(native, ino_i->i_size);
282 ino2->i_atime = conv32(native, ino_i->i_atime);
283 ino2->i_mtime = conv32(native, ino_i->i_mtime);
284 ino2->i_ctime = conv32(native, ino_i->i_ctime);
285
286 for (i = 0; i < V2_NR_DIRECT_ZONES; ++i)
287 ino2->i_dzone[i] = conv32(native, ino_i->i_dzone[i]);
288
289 for (i = 0; i < V2_NR_INDIRECT_ZONES; ++i)
290 ino2->i_izone[i] = conv32(native, ino_i->i_izone[i]);
291
292 b->dirty = true;
293 block_put(b);
294 ino_i->dirty = false;
295
296out:
297 return r;
298}
299
300int
301inode_shrink(struct mfs_node *mnode, size_t size_shrink)
302{
303 struct mfs_sb_info *sbi = mnode->instance->sbi;
304 struct mfs_ino_info *ino_i = mnode->ino_i;
305 const size_t bs = sbi->block_size;
306 int r;
307
308 if (size_shrink == 0) {
309 /*File is empty*/
310 return EOK;
311 }
312
313 const size_t old_size = ino_i->i_size;
314 const size_t new_size = ino_i->i_size - size_shrink;
315
316 assert(size_shrink <= old_size);
317
318 ino_i->dirty = true;
319
320 /*Compute the number of zones to free*/
321 unsigned zones_to_free;
322
323 size_t diff = old_size - new_size;
324 zones_to_free = diff / bs;
325
326 if (diff % bs != 0)
327 zones_to_free++;
328
329 uint32_t pos = old_size - 1;
330 unsigned i;
331 for (i = 0; i < zones_to_free; ++i, pos -= bs) {
332 uint32_t old_zone;
333
334 r = write_map(mnode, pos, 0, &old_zone);
335 on_error(r, goto exit_error);
336
337 ino_i->i_size -= bs;
338
339 if (old_zone == 0)
340 continue; /*Sparse block*/
341
342 r = mfs_free_zone(mnode->instance, old_zone);
343 on_error(r, goto exit_error);
344 }
345
346 ino_i->i_size = new_size;
347
348 return prune_ind_zones(mnode, new_size);
349
350exit_error:
351 return r;
352}
353
354/**
355 * @}
356 */
357
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