source: mainline/uspace/srv/fs/tmpfs/tmpfs_dump.c@ 7858bc5f

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 7858bc5f was 7858bc5f, checked in by Jakub Jermar <jakub@…>, 17 years ago

Setup communication parameters with the block device in block_init(). The file
system now doesn't know anything about the communication with the block device.
Rename blockread() to block_read(). The boot block is now read only once. The file
system can get access it using the block_bb_get() function.
  • Property mode set to 100644
File size: 4.5 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
63 do {
64 char *fname;
65 tmpfs_dentry_t *node;
66 uint32_t size;
67
68 if (!block_read(dev, bufpos, buflen, pos, &entry, sizeof(entry),
69 TMPFS_BLOCK_SIZE))
70 return false;
71
72 entry.len = uint32_t_le2host(entry.len);
73
74 switch (entry.type) {
75 case TMPFS_NONE:
76 break;
77 case TMPFS_FILE:
78 fname = malloc(entry.len + 1);
79 if (fname == NULL)
80 return false;
81
82 node = (tmpfs_dentry_t *) ops->create(L_FILE);
83 if (node == NULL) {
84 free(fname);
85 return false;
86 }
87
88 if (!block_read(dev, bufpos, buflen, pos, fname,
89 entry.len, TMPFS_BLOCK_SIZE)) {
90 ops->destroy((void *) node);
91 free(fname);
92 return false;
93 }
94 fname[entry.len] = 0;
95
96 if (!ops->link((void *) parent, (void *) node, fname)) {
97 ops->destroy((void *) node);
98 free(fname);
99 return false;
100 }
101 free(fname);
102
103 if (!block_read(dev, bufpos, buflen, pos, &size,
104 sizeof(size), TMPFS_BLOCK_SIZE))
105 return false;
106
107 size = uint32_t_le2host(size);
108
109 node->data = malloc(size);
110 if (node->data == NULL)
111 return false;
112
113 node->size = size;
114 if (!block_read(dev, bufpos, buflen, pos, node->data,
115 size, TMPFS_BLOCK_SIZE))
116 return false;
117
118 break;
119 case TMPFS_DIRECTORY:
120 fname = malloc(entry.len + 1);
121 if (fname == NULL)
122 return false;
123
124 node = (tmpfs_dentry_t *) ops->create(L_DIRECTORY);
125 if (node == NULL) {
126 free(fname);
127 return false;
128 }
129
130 if (!block_read(dev, bufpos, buflen, pos,
131 fname, entry.len, TMPFS_BLOCK_SIZE)) {
132 ops->destroy((void *) node);
133 free(fname);
134 return false;
135 }
136 fname[entry.len] = 0;
137
138 if (!ops->link((void *) parent, (void *) node, fname)) {
139 ops->destroy((void *) node);
140 free(fname);
141 return false;
142 }
143 free(fname);
144
145 if (!tmpfs_restore_recursion(dev, bufpos, buflen, pos,
146 node))
147 return false;
148
149 break;
150 default:
151 return false;
152 }
153 } while (entry.type != TMPFS_NONE);
154
155 return true;
156}
157
158bool tmpfs_restore(dev_handle_t dev)
159{
160 libfs_ops_t *ops = &tmpfs_libfs_ops;
161 int rc;
162
163 rc = block_init(dev, TMPFS_BLOCK_SIZE, 0, 0);
164 if (rc != EOK)
165 return false;
166
167 off_t bufpos = 0;
168 size_t buflen = 0;
169 off_t pos = 0;
170
171 char tag[6];
172 if (!block_read(dev, &bufpos, &buflen, &pos, tag, 5,
173 TMPFS_BLOCK_SIZE))
174 goto error;
175
176 tag[5] = 0;
177 if (strcmp(tag, "TMPFS") != 0)
178 goto error;
179
180 if (!tmpfs_restore_recursion(dev, &bufpos, &buflen, &pos,
181 ops->root_get(dev)))
182 goto error;
183
184 block_fini(dev);
185 return true;
186
187error:
188 block_fini(dev);
189 return false;
190}
191
192/**
193 * @}
194 */
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