source: mainline/uspace/srv/fs/tmpfs/tmpfs_dump.c@ 0013b9ce

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 0013b9ce was 0013b9ce, checked in by Jakub Jermar <jakub@…>, 17 years ago

libfs operation link() should return standard error code instead of mere
true/false.
  • Property mode set to 100644
File size: 4.6 KB
Line 
1/*
2 * Copyright (c) 2008 Jakub Jermar
3 * Copyright (c) 2008 Martin Decky
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * - Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * - The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30/** @addtogroup fs
31 * @{
32 */
33
34/**
35 * @file tmpfs_dump.c
36 * @brief Support for loading TMPFS file system dump.
37 */
38
39#include "tmpfs.h"
40#include "../../vfs/vfs.h"
41#include <errno.h>
42#include <stdlib.h>
43#include <string.h>
44#include <sys/types.h>
45#include <as.h>
46#include <libblock.h>
47#include <byteorder.h>
48
49#define TMPFS_BLOCK_SIZE 1024
50
51struct rdentry {
52 uint8_t type;
53 uint32_t len;
54} __attribute__((packed));
55
56static bool
57tmpfs_restore_recursion(int dev, off_t *bufpos, size_t *buflen, off_t *pos,
58 tmpfs_dentry_t *parent)
59{
60 struct rdentry entry;
61 libfs_ops_t *ops = &tmpfs_libfs_ops;
62 int rc;
63
64 do {
65 char *fname;
66 tmpfs_dentry_t *node;
67 uint32_t size;
68
69 if (block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
70 TMPFS_BLOCK_SIZE) != EOK)
71 return false;
72
73 entry.len = uint32_t_le2host(entry.len);
74
75 switch (entry.type) {
76 case TMPFS_NONE:
77 break;
78 case TMPFS_FILE:
79 fname = malloc(entry.len + 1);
80 if (fname == NULL)
81 return false;
82
83 node = (tmpfs_dentry_t *) ops->create(dev, L_FILE);
84 if (node == NULL) {
85 free(fname);
86 return false;
87 }
88
89 if (block_read(dev, bufpos, buflen, pos, fname,
90 entry.len, TMPFS_BLOCK_SIZE) != EOK) {
91 ops->destroy((void *) node);
92 free(fname);
93 return false;
94 }
95 fname[entry.len] = 0;
96
97 rc = ops->link((void *) parent, (void *) node, fname);
98 if (rc != EOK) {
99 ops->destroy((void *) node);
100 free(fname);
101 return false;
102 }
103 free(fname);
104
105 if (block_read(dev, bufpos, buflen, pos, &size,
106 sizeof(size), TMPFS_BLOCK_SIZE) != EOK)
107 return false;
108
109 size = uint32_t_le2host(size);
110
111 node->data = malloc(size);
112 if (node->data == NULL)
113 return false;
114
115 node->size = size;
116 if (block_read(dev, bufpos, buflen, pos, node->data,
117 size, TMPFS_BLOCK_SIZE) != EOK)
118 return false;
119
120 break;
121 case TMPFS_DIRECTORY:
122 fname = malloc(entry.len + 1);
123 if (fname == NULL)
124 return false;
125
126 node = (tmpfs_dentry_t *) ops->create(dev, L_DIRECTORY);
127 if (node == NULL) {
128 free(fname);
129 return false;
130 }
131
132 if (block_read(dev, bufpos, buflen, pos, fname,
133 entry.len, TMPFS_BLOCK_SIZE) != EOK) {
134 ops->destroy((void *) node);
135 free(fname);
136 return false;
137 }
138 fname[entry.len] = 0;
139
140 rc = ops->link((void *) parent, (void *) node, fname);
141 if (rc != EOK) {
142 ops->destroy((void *) node);
143 free(fname);
144 return false;
145 }
146 free(fname);
147
148 if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
149 node))
150 return false;
151
152 break;
153 default:
154 return false;
155 }
156 } while (entry.type != TMPFS_NONE);
157
158 return true;
159}
160
161bool tmpfs_restore(dev_handle_t dev)
162{
163 libfs_ops_t *ops = &tmpfs_libfs_ops;
164 int rc;
165
166 rc = block_init(dev, TMPFS_BLOCK_SIZE);
167 if (rc != EOK)
168 return false;
169
170 off_t bufpos = 0;
171 size_t buflen = 0;
172 off_t pos = 0;
173
174 char tag[6];
175 if (block_read(dev, &bufpos, &buflen, &pos, tag, 5,
176 TMPFS_BLOCK_SIZE) != EOK)
177 goto error;
178
179 tag[5] = 0;
180 if (strcmp(tag, "TMPFS") != 0)
181 goto error;
182
183 if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
184 ops->root_get(dev)))
185 goto error;
186
187 block_fini(dev);
188 return true;
189
190error:
191 block_fini(dev);
192 return false;
193}
194
195/**
196 * @}
197 */
Note: See TracBrowser for help on using the repository browser.