usr.sbin/puffs/rump_tmpfs/rump_tmpfs.c

   1 /*      $NetBSD: rump_tmpfs.c,v 1.3 2008/09/04 15:34:56 pooka Exp $     */
   2
   3 /*
   4  * Copyright (c) 2008 Antti Kantee.  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  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/types.h>
  29 #include <sys/mount.h>
  30
  31 #include <fs/tmpfs/tmpfs_args.h>
  32
  33 #include <err.h>
  34 #include <puffs.h>
  35 #include <stdlib.h>
  36 #include <unistd.h>
  37
  38 #include <rump/p2k.h>
  39
  40 #include "mount_tmpfs.h"
  41
  42 /*
  43  * tmpfs has a slight "issue" with file content storage.  Since it
  44  * stores data in memory, we will end up using 2x the RAM for
  45  * storage if we cache in puffs vfs.  If we don't, we need to take
  46  * the slow path from the kernel to the file server every time the
  47  * file is accessed.  It's either suck or suck.  However, rump_tmpfs
  48  * will not be used in real life, so this is hardly a release-stopping
  49  * issue of catastrophic proportions.  For now we opt for un-double
  50  * storage (PUFFS_KFLAG_NOCACHE_PAGE).
  51  */
  52
  53 int
  54 main(int argc, char *argv[])
  55 {
  56         struct tmpfs_args args;
  57         char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
  58         int mntflags;
  59         int rv;
  60
  61         setprogname(argv[0]);
  62
  63         mount_tmpfs_parseargs(argc, argv, &args, &mntflags,
  64             canon_dev, canon_dir);
  65         rv = p2k_run_fs(MOUNT_TMPFS, canon_dev, canon_dir, mntflags,
  66                 &args, sizeof(args), PUFFS_KFLAG_NOCACHE_PAGE);
  67         if (rv)
  68                 err(1, "mount");
  69
  70         return 0;
  71 }