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root/usr/server/fs/ramfs/ramfs_vfsops.c

DEFINITIONS

1. ramfs_mount
2. ramfs_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  */
  30 #include <sys/vnode.h>
  31 #include <sys/mount.h>
  33 #include <errno.h>
  35 #include "ramfs.h"
  37 extern struct vnops ramfs_vnops;
  39 static int ramfs_mount(mount_t mp, char *dev, int flags, void *data);
  40 static int ramfs_unmount(mount_t mp);
  41 #define ramfs_sync      ((vfsop_sync_t)vfs_nullop)
  42 #define ramfs_vget      ((vfsop_vget_t)vfs_nullop)
  43 #define ramfs_statfs    ((vfsop_statfs_t)vfs_nullop)
  45 /*
  46  * File system operations
  47  */
  48 struct vfsops ramfs_vfsops = {
ramfs_mount,            /* mount */
ramfs_unmount,          /* unmount */
ramfs_sync,             /* sync */
ramfs_vget,             /* vget */
ramfs_statfs,           /* statfs */
  54         &ramfs_vnops,           /* vnops */
  55 };
  57 /*
  58  * Mount a file system.
  59  */
  60 static int
ramfs_mount(mount_t mp, char *dev, int flags, void *data)
  62 {
  63         struct ramfs_node *np;
DPRINTF(("ramfs_mount: dev=%s\n", dev));
  67         /* Create a root node */
np = ramfs_allocate_node("/", VDIR);
  69         if (np == NULL)
  70                 return ENOMEM;
mp->m_root->v_data = np;
  72         return 0;
  73 }
  75 /*
  76  * Unmount a file system.
  77  *
  78  * NOTE: Currently, we don't support unmounting of the RAMFS. This is
  79  *       because we have to deallocate all nodes included in all sub
  80  *       directories, and it requires more work...
  81  */
  82 static int
ramfs_unmount(mount_t mp)
  84 {
  86         return EBUSY;
  87 }