scoutos / prex-0.9.0 / usr / server / fs / arfs / arfs_vfsops.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2006-2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * arfs_vfsops.c - vfs operations for archive file system.
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32 | */
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33 | |||
34 | #include <sys/vnode.h> |
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35 | #include <sys/mount.h> |
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36 | #include <sys/param.h> |
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37 | #include <sys/buf.h> |
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38 | |||
39 | #include <stdlib.h> |
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40 | #include <string.h> |
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41 | #include <errno.h> |
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42 | #include <ar.h> |
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43 | |||
44 | #include "arfs.h" |
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45 | |||
46 | extern struct vnops arfs_vnops; |
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47 | |||
48 | |||
49 | static int arfs_mount (mount_t mp, char *dev, int flags, void *data); |
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50 | static int arfs_unmount (mount_t mp); |
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51 | #define arfs_sync ((vfsop_sync_t)vfs_nullop)
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52 | #define arfs_vget ((vfsop_vget_t)vfs_nullop)
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53 | #define arfs_statfs ((vfsop_statfs_t)vfs_nullop)
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54 | |||
55 | /*
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56 | * File system operations
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57 | */
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58 | const struct vfsops arfs_vfsops = { |
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59 | arfs_mount, /* mount */
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60 | arfs_unmount, /* unmount */
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61 | arfs_sync, /* sync */
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62 | arfs_vget, /* vget */
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63 | arfs_statfs, /* statfs */
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64 | &arfs_vnops, /* vnops */
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65 | }; |
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66 | |||
67 | /*
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68 | * Mount a file system.
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69 | */
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70 | static int |
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71 | arfs_mount(mount_t mp, char *dev, int flags, void *data) |
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72 | { |
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73 | size_t size; |
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74 | char *buf;
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75 | int error = 0; |
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76 | |||
77 | DPRINTF(("arfs_mount: dev=%s\n", dev));
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78 | |||
79 | if ((buf = malloc(BSIZE)) == NULL) |
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80 | return ENOMEM;
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81 | |||
82 | /* Read first block */
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83 | size = BSIZE; |
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84 | error = device_read((device_t)mp->m_dev, buf, &size, 0);
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85 | if (error) {
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86 | DPRINTF(("arfs_mount: read error=%d\n", error));
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87 | goto out;
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88 | } |
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89 | |||
90 | /* Check if the device includes valid archive image. */
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91 | if (strncmp(buf, ARMAG, SARMAG)) {
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92 | DPRINTF(("arfs_mount: invalid archive image!\n"));
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93 | error = EINVAL; |
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94 | goto out;
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95 | } |
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96 | |||
97 | /* Ok, we find the archive */
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98 | mp->m_flags |= MNT_RDONLY; |
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99 | out:
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100 | free(buf); |
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101 | return error;
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102 | } |
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103 | |||
104 | static int |
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105 | arfs_unmount(mount_t mp) |
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106 | { |
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107 | return 0; |
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108 | } |