source: mainline/uspace/srv/fs/mfs/mfs_inode.c@ d5c1051

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since d5c1051 was d5c1051, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 8 years ago

"Obviously harmless" error handling tweaks.
  • Property mode set to 100644
File size: 9.1 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 int
43mfs_read_inode_raw(const struct mfs_instance *instance,
44 struct mfs_ino_info **ino_ptr, uint16_t inum);
45
46static int
47mfs2_read_inode_raw(const struct mfs_instance *instance,
48 struct mfs_ino_info **ino_ptr, uint32_t inum);
49
50/**Read a MINIX inode from disk
51 *
52 * @param inst Pointer to the filesystem instance.
53 * @param ino_i Pointer to the generic MINIX inode
54 * where the inode content will be stored.
55 * @param index index of the inode to read.
56 *
57 * @return EOK on success or a negative error code.
58 */
59int
60mfs_get_inode(struct mfs_instance *inst, struct mfs_ino_info **ino_i,
61 fs_index_t index)
62{
63 struct mfs_sb_info *sbi = inst->sbi;
64 int r;
65
66 if (sbi->fs_version == MFS_VERSION_V1) {
67 /* Read a MFS V1 inode */
68 r = mfs_read_inode_raw(inst, ino_i, index);
69 } else {
70 /* Read a MFS V2/V3 inode */
71 r = mfs2_read_inode_raw(inst, ino_i, index);
72 }
73
74 return r;
75}
76
77static int
78mfs_read_inode_raw(const struct mfs_instance *instance,
79 struct mfs_ino_info **ino_ptr, uint16_t inum)
80{
81 struct mfs_inode *ino;
82 struct mfs_ino_info *ino_i = NULL;
83 struct mfs_sb_info *sbi;
84 block_t *b;
85 int i;
86 int r;
87
88 sbi = instance->sbi;
89
90 /* inode 0 does not exist */
91 inum -= 1;
92
93 const int ino_off = inum % sbi->ino_per_block;
94
95 ino_i = malloc(sizeof(*ino_i));
96
97 if (!ino_i) {
98 r = ENOMEM;
99 goto out_err;
100 }
101
102 const int itable_off = sbi->itable_off;
103
104 r = block_get(&b, instance->service_id,
105 itable_off + inum / sbi->ino_per_block,
106 BLOCK_FLAGS_NONE);
107
108 if (r != EOK)
109 goto out_err;
110
111 ino = b->data + ino_off * sizeof(struct mfs_inode);
112
113 ino_i->i_mode = conv16(sbi->native, ino->i_mode);
114 ino_i->i_uid = conv16(sbi->native, ino->i_uid);
115 ino_i->i_size = conv32(sbi->native, ino->i_size);
116 ino_i->i_mtime = conv32(sbi->native, ino->i_mtime);
117 ino_i->i_nlinks = ino->i_nlinks;
118
119 for (i = 0; i < V1_NR_DIRECT_ZONES; ++i)
120 ino_i->i_dzone[i] = conv16(sbi->native, ino->i_dzone[i]);
121
122 for (i = 0; i < V1_NR_INDIRECT_ZONES; ++i)
123 ino_i->i_izone[i] = conv16(sbi->native, ino->i_izone[i]);
124
125 r = block_put(b);
126 ino_i->dirty = false;
127 *ino_ptr = ino_i;
128
129 return r;
130
131out_err:
132 if (ino_i)
133 free(ino_i);
134 return EOK;
135}
136
137static int
138mfs2_read_inode_raw(const struct mfs_instance *instance,
139 struct mfs_ino_info **ino_ptr, uint32_t inum)
140{
141 struct mfs2_inode *ino;
142 struct mfs_ino_info *ino_i = NULL;
143 struct mfs_sb_info *sbi;
144 block_t *b;
145 int i;
146 int r;
147
148 ino_i = malloc(sizeof(*ino_i));
149
150 if (!ino_i) {
151 r = ENOMEM;
152 goto out_err;
153 }
154
155 sbi = instance->sbi;
156
157 /* inode 0 does not exist */
158 inum -= 1;
159
160 const int itable_off = sbi->itable_off;
161 const int ino_off = inum % sbi->ino_per_block;
162
163 r = block_get(&b, instance->service_id,
164 itable_off + inum / sbi->ino_per_block,
165 BLOCK_FLAGS_NONE);
166
167 if (r != EOK)
168 goto out_err;
169
170 ino = b->data + ino_off * sizeof(struct mfs2_inode);
171
172 ino_i->i_mode = conv16(sbi->native, ino->i_mode);
173 ino_i->i_nlinks = conv16(sbi->native, ino->i_nlinks);
174 ino_i->i_uid = conv16(sbi->native, ino->i_uid);
175 ino_i->i_gid = conv16(sbi->native, ino->i_gid);
176 ino_i->i_size = conv32(sbi->native, ino->i_size);
177 ino_i->i_atime = conv32(sbi->native, ino->i_atime);
178 ino_i->i_mtime = conv32(sbi->native, ino->i_mtime);
179 ino_i->i_ctime = conv32(sbi->native, ino->i_ctime);
180
181 for (i = 0; i < V2_NR_DIRECT_ZONES; ++i)
182 ino_i->i_dzone[i] = conv32(sbi->native, ino->i_dzone[i]);
183
184 for (i = 0; i < V2_NR_INDIRECT_ZONES; ++i)
185 ino_i->i_izone[i] = conv32(sbi->native, ino->i_izone[i]);
186
187 r = block_put(b);
188 ino_i->dirty = false;
189 *ino_ptr = ino_i;
190
191 return r;
192
193out_err:
194 if (ino_i)
195 free(ino_i);
196 return EOK;
197}
198
199/**Write a MINIX inode on disk (if marked as dirty)
200 *
201 * @param mnode Pointer to the generic MINIX inode in memory.
202 *
203 * @return EOK on success or a negative error code.
204 */
205int
206mfs_put_inode(struct mfs_node *mnode)
207{
208 int rc = EOK;
209
210 if (!mnode->ino_i->dirty)
211 goto out;
212
213 struct mfs_instance *inst = mnode->instance;
214 struct mfs_sb_info *sbi = inst->sbi;
215
216 if (sbi->fs_version == MFS_VERSION_V1)
217 rc = mfs_write_inode_raw(mnode);
218 else
219 rc = mfs2_write_inode_raw(mnode);
220
221out:
222 return rc;
223}
224
225static int
226mfs_write_inode_raw(struct mfs_node *mnode)
227{
228 int i;
229 int r;
230 block_t *b;
231 struct mfs_ino_info *ino_i = mnode->ino_i;
232 struct mfs_sb_info *sbi = mnode->instance->sbi;
233
234 const uint32_t inum = ino_i->index - 1;
235 const int itable_off = sbi->itable_off;
236 const int ino_off = inum % sbi->ino_per_block;
237 const bool native = sbi->native;
238
239 r = block_get(&b, mnode->instance->service_id,
240 itable_off + inum / sbi->ino_per_block,
241 BLOCK_FLAGS_NONE);
242
243 if (r != EOK)
244 goto out;
245
246 struct mfs_inode *ino = b->data;
247 ino += ino_off;
248
249 ino->i_mode = conv16(native, ino_i->i_mode);
250 ino->i_uid = conv16(native, ino_i->i_uid);
251 ino->i_gid = ino_i->i_gid;
252 ino->i_nlinks = ino_i->i_nlinks;
253 ino->i_size = conv32(native, ino_i->i_size);
254 ino->i_mtime = conv32(native, ino_i->i_mtime);
255
256 for (i = 0; i < V1_NR_DIRECT_ZONES; ++i)
257 ino->i_dzone[i] = conv16(native, ino_i->i_dzone[i]);
258 for (i = 0; i < V1_NR_INDIRECT_ZONES; ++i)
259 ino->i_izone[i] = conv16(native, ino_i->i_izone[i]);
260
261 b->dirty = true;
262 r = block_put(b);
263
264 ino_i->dirty = false;
265out:
266 return r;
267}
268
269static int
270mfs2_write_inode_raw(struct mfs_node *mnode)
271{
272 struct mfs_ino_info *ino_i = mnode->ino_i;
273 struct mfs_sb_info *sbi = mnode->instance->sbi;
274 block_t *b;
275 int i;
276 int r;
277
278 const uint32_t inum = ino_i->index - 1;
279 const int itable_off = sbi->itable_off;
280 const int ino_off = inum % sbi->ino_per_block;
281 const bool native = sbi->native;
282
283 r = block_get(&b, mnode->instance->service_id,
284 itable_off + inum / sbi->ino_per_block,
285 BLOCK_FLAGS_NONE);
286
287 if (r != EOK)
288 goto out;
289
290 struct mfs2_inode *ino2 = b->data;
291 ino2 += ino_off;
292
293 ino2->i_mode = conv16(native, ino_i->i_mode);
294 ino2->i_nlinks = conv16(native, ino_i->i_nlinks);
295 ino2->i_uid = conv16(native, ino_i->i_uid);
296 ino2->i_gid = conv16(native, ino_i->i_gid);
297 ino2->i_size = conv32(native, ino_i->i_size);
298 ino2->i_atime = conv32(native, ino_i->i_atime);
299 ino2->i_mtime = conv32(native, ino_i->i_mtime);
300 ino2->i_ctime = conv32(native, ino_i->i_ctime);
301
302 for (i = 0; i < V2_NR_DIRECT_ZONES; ++i)
303 ino2->i_dzone[i] = conv32(native, ino_i->i_dzone[i]);
304
305 for (i = 0; i < V2_NR_INDIRECT_ZONES; ++i)
306 ino2->i_izone[i] = conv32(native, ino_i->i_izone[i]);
307
308 b->dirty = true;
309 r = block_put(b);
310 ino_i->dirty = false;
311
312out:
313 return r;
314}
315
316/**Reduce the inode size of a given number of bytes
317 *
318 * @param mnode Pointer to the generic MINIX inode in memory.
319 * @param size_shrink Number of bytes that will be subtracted to the inode.
320 *
321 * @return EOK on success or a negative error code.
322 */
323int
324mfs_inode_shrink(struct mfs_node *mnode, size_t size_shrink)
325{
326 struct mfs_sb_info *sbi = mnode->instance->sbi;
327 struct mfs_ino_info *ino_i = mnode->ino_i;
328 const size_t bs = sbi->block_size;
329 int r;
330
331 if (size_shrink == 0) {
332 /* Nothing to be done */
333 return EOK;
334 }
335
336 const size_t old_size = ino_i->i_size;
337 const size_t new_size = ino_i->i_size - size_shrink;
338
339 assert(size_shrink <= old_size);
340
341 ino_i->dirty = true;
342
343 /* Compute the number of zones to free */
344 unsigned zones_to_free;
345
346 size_t diff = old_size - new_size;
347 zones_to_free = diff / bs;
348
349 if (diff % bs != 0)
350 zones_to_free++;
351
352 uint32_t pos = old_size - 1;
353 unsigned i;
354 for (i = 0; i < zones_to_free; ++i, pos -= bs) {
355 uint32_t old_zone;
356
357 r = mfs_write_map(mnode, pos, 0, &old_zone);
358 if (r != EOK)
359 goto exit_error;
360
361 ino_i->i_size -= bs;
362
363 if (old_zone == 0)
364 continue; /* Sparse block */
365
366 r = mfs_free_zone(mnode->instance, old_zone);
367 if (r != EOK)
368 goto exit_error;
369 }
370
371 ino_i->i_size = new_size;
372
373 return mfs_prune_ind_zones(mnode, new_size);
374
375exit_error:
376 return r;
377}
378
379/**
380 * @}
381 */
382
Note: See TracBrowser for help on using the repository browser.