source: mainline/uspace/srv/fs/minixfs/mfs_inode.c@ c922bc7

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since c922bc7 was c922bc7, checked in by Maurizio Lombardi <m.lombardi85@…>, 14 years ago

Add function get_inode(), it is used to obtain a generic minix inode without
messing around with these ugly "if (fsversion == x) .. else if (fsversion == y)…"
  • Property mode set to 100644
File size: 8.4 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 <assert.h>
35#include <errno.h>
36#include <mem.h>
37#include "mfs.h"
38#include "mfs_utils.h"
39
40static int
41mfs_write_inode_raw(struct mfs_node *mnode);
42
43static int
44mfs2_write_inode_raw(struct mfs_node *mnode);
45
46static struct mfs_ino_info *
47mfs_read_inode_raw(const struct mfs_instance *instance, uint16_t inum);
48
49static struct mfs_ino_info *
50mfs2_read_inode_raw(const struct mfs_instance *instance, uint32_t inum);
51
52
53int
54get_inode(struct mfs_instance *inst, struct mfs_ino_info **ino_i,
55 fs_index_t index)
56{
57 struct mfs_sb_info *sbi = inst->sbi;
58
59 if (sbi->fs_version == MFS_VERSION_V1) {
60 /*Read a MFS V1 inode*/
61 *ino_i = mfs_read_inode_raw(inst, index);
62 } else {
63 /*Read a MFS V2/V3 inode*/
64 *ino_i = mfs2_read_inode_raw(inst, index);
65 }
66
67 if (*ino_i == NULL)
68 return -1;
69
70 return EOK;
71}
72
73static struct mfs_ino_info *
74mfs_read_inode_raw(const struct mfs_instance *instance, uint16_t inum)
75{
76 struct mfs_inode *ino = NULL;
77 struct mfs_ino_info *ino_i = NULL;
78 struct mfs_sb_info *sbi;
79 block_t *b;
80 int i;
81
82 sbi = instance->sbi;
83 assert(sbi);
84
85 const int ino_off = inum % sbi->ino_per_block;
86 const size_t ino_size = sizeof(struct mfs_inode);
87
88 ino_i = malloc(sizeof(*ino_i));
89 ino = malloc(ino_size);
90
91 if (!ino || !ino_i)
92 goto out_err;
93
94 const int itable_off = sbi->itable_off;
95
96 if (block_get(&b, instance->handle,
97 itable_off + inum / sbi->ino_per_block,
98 BLOCK_FLAGS_NONE) != EOK)
99 goto out_err;
100
101 memcpy(ino, ((uint8_t *) b->data) + ino_off * ino_size, ino_size);
102
103 ino_i->i_mode = conv16(sbi->native, ino->i_mode);
104 ino_i->i_uid = conv16(sbi->native, ino->i_uid);
105 ino_i->i_size = conv32(sbi->native, ino->i_size);
106 ino_i->i_mtime = conv32(sbi->native, ino->i_mtime);
107 ino_i->i_nlinks = ino->i_nlinks;
108
109 for (i = 0; i < V1_NR_DIRECT_ZONES; ++i)
110 ino_i->i_dzone[i] = conv16(sbi->native, ino->i_dzone[i]);
111
112 for (i = 0; i < V1_NR_INDIRECT_ZONES; ++i)
113 ino_i->i_izone[i] = conv16(sbi->native, ino->i_izone[i]);
114
115 block_put(b);
116 free(ino);
117 ino_i->dirty = false;
118
119 return ino_i;
120
121out_err:
122 if (ino)
123 free(ino);
124 if (ino_i)
125 free(ino_i);
126 return NULL;
127}
128
129static struct mfs_ino_info *
130mfs2_read_inode_raw(const struct mfs_instance *instance, uint32_t inum)
131{
132 struct mfs2_inode *ino = NULL;
133 struct mfs_ino_info *ino_i = NULL;
134 struct mfs_sb_info *sbi;
135 block_t *b;
136 int i;
137
138 const size_t ino_size = sizeof(struct mfs2_inode);
139
140 ino = malloc(ino_size);
141 ino_i = malloc(sizeof(*ino_i));
142
143 if (!ino || !ino_i)
144 goto out_err;
145
146 sbi = instance->sbi;
147 assert(sbi);
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, ((uint8_t *)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 int itable_off = sbi->itable_off;
222 const int ino_off = ino_i->index % sbi->ino_per_block;
223 const bool native = sbi->native;
224
225 r = block_get(&b, mnode->instance->handle,
226 itable_off + ino_i->index / sbi->ino_per_block,
227 BLOCK_FLAGS_NONE);
228
229 if (r != EOK)
230 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 int itable_off = sbi->itable_off;
264 const int ino_off = ino_i->index % sbi->ino_per_block;
265 const bool native = sbi->native;
266
267 r = block_get(&b, mnode->instance->handle,
268 itable_off + ino_i->index / sbi->ino_per_block,
269 BLOCK_FLAGS_NONE);
270
271 if (r != EOK)
272 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_mode);
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_grow(struct mfs_node *mnode, unsigned size_grow)
302{
303 unsigned i;
304
305 if (size_grow == 0)
306 return EOK;
307
308 struct mfs_sb_info *sbi = mnode->instance->sbi;
309 struct mfs_ino_info *ino_i = mnode->ino_i;
310 const int bs = sbi->block_size;
311
312 const uint32_t old_size = ino_i->i_size;
313 const uint32_t new_size = old_size + size_grow;
314
315 /*Compute the number of zones to add to the inode*/
316 unsigned zones_to_add = 0;
317 if ((old_size % (bs - 1)) == 0)
318 zones_to_add++;
319
320 zones_to_add += (new_size - old_size) / bs;
321
322 /*Compute the start zone*/
323 unsigned start_zone = old_size / bs;
324 start_zone += (old_size % bs) != 0;
325
326 int r;
327 for (i = 0; i < zones_to_add; ++i) {
328 uint32_t new_zone;
329 uint32_t dummy;
330
331 r = mfs_alloc_bit(mnode->instance, &new_zone, BMAP_ZONE);
332 if (r != EOK)
333 return r;
334
335 r = write_map(mnode, (start_zone + i) * sbi->block_size,
336 new_zone, &dummy);
337 if (r != EOK)
338 return r;
339
340 ino_i->i_size += bs;
341 ino_i->dirty = true;
342 }
343 return EOK;
344}
345
346/**
347 * @}
348 */
349
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