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root/usr/server/fs/arfs/arfs_vfsops.c

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DEFINITIONS

This source file includes following definitions.
  1. arfs_mount
  2. arfs_unmount
   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 error = 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         error = device_read((device_t)mp->m_dev, buf, &size, 0);
  85         if (error) {
  86                 DPRINTF(("arfs_mount: read error=%d\n", error));
  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                 error = 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 error;
 102 }
 103 
 104 static int
 105 arfs_unmount(mount_t mp)
 106 {
 107         return 0;
 108 }
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