Annotation of prex/usr/server/fs/arfs/arfs_vfsops.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 2006-2007, Kohsuke Ohtani
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: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: /*
31: * arfs_vfsops.c - vfs operations for archive file system.
32: */
33:
34: #include <sys/vnode.h>
35: #include <sys/mount.h>
36: #include <sys/param.h>
37: #include <sys/buf.h>
38:
39: #include <stdlib.h>
40: #include <string.h>
41: #include <errno.h>
42: #include <ar.h>
43:
44: #include "arfs.h"
45:
46: extern struct vnops arfs_vnops;
47:
48:
49: static int arfs_mount (mount_t mp, char *dev, int flags, void *data);
50: static int arfs_unmount (mount_t mp);
51: #define arfs_sync ((vfsop_sync_t)vfs_nullop)
52: #define arfs_vget ((vfsop_vget_t)vfs_nullop)
53: #define arfs_statfs ((vfsop_statfs_t)vfs_nullop)
54:
55: /*
56: * File system operations
57: */
58: const struct vfsops arfs_vfsops = {
59: arfs_mount, /* mount */
60: arfs_unmount, /* unmount */
61: arfs_sync, /* sync */
62: arfs_vget, /* vget */
63: arfs_statfs, /* statfs */
64: &arfs_vnops, /* vnops */
65: };
66:
67: /*
68: * Mount a file system.
69: */
70: static int
71: arfs_mount(mount_t mp, char *dev, int flags, void *data)
72: {
73: size_t size;
74: char *buf;
75: int err = 0;
76:
77: DPRINTF(("arfs_mount: dev=%s\n", dev));
78:
79: if ((buf = malloc(BSIZE)) == NULL)
80: return ENOMEM;
81:
82: /* Read first block */
83: size = BSIZE;
84: err = device_read((device_t)mp->m_dev, buf, &size, 0);
85: if (err) {
86: DPRINTF(("arfs_mount: read error=%d\n", err));
87: goto out;
88: }
89:
90: /* Check if the device includes valid archive image. */
91: if (strncmp(buf, ARMAG, SARMAG)) {
92: DPRINTF(("arfs_mount: invalid archive image!\n"));
93: err = EINVAL;
94: goto out;
95: }
96:
97: /* Ok, we find the archive */
98: mp->m_flags |= MNT_RDONLY;
99: out:
100: free(buf);
101: return err;
102: }
103:
104: static int
105: arfs_unmount(mount_t mp)
106: {
107: return 0;
108: }
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