File: [local] / prex / usr / server / fs / arfs / arfs_vfsops.c (download)
Revision 1.1.1.1 (vendor branch), Tue Aug 19 12:47:01 2008 UTC (15 years, 10 months ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, HEAD Changes since 1.1: +0 -0 lines
Initial import of Prex, Portable Real-time Embedded POSIX microkernel system.
I have totally new directions in my development (more focused on real hardware, not virtual one).
Old hacks are available in prex-old module. They will be carefully re-designed and merged soon.
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/*
* Copyright (c) 2006-2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* arfs_vfsops.c - vfs operations for archive file system.
*/
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/param.h>
#include <sys/buf.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ar.h>
#include "arfs.h"
extern struct vnops arfs_vnops;
static int arfs_mount (mount_t mp, char *dev, int flags, void *data);
static int arfs_unmount (mount_t mp);
#define arfs_sync ((vfsop_sync_t)vfs_nullop)
#define arfs_vget ((vfsop_vget_t)vfs_nullop)
#define arfs_statfs ((vfsop_statfs_t)vfs_nullop)
/*
* File system operations
*/
const struct vfsops arfs_vfsops = {
arfs_mount, /* mount */
arfs_unmount, /* unmount */
arfs_sync, /* sync */
arfs_vget, /* vget */
arfs_statfs, /* statfs */
&arfs_vnops, /* vnops */
};
/*
* Mount a file system.
*/
static int
arfs_mount(mount_t mp, char *dev, int flags, void *data)
{
size_t size;
char *buf;
int err = 0;
DPRINTF(("arfs_mount: dev=%s\n", dev));
if ((buf = malloc(BSIZE)) == NULL)
return ENOMEM;
/* Read first block */
size = BSIZE;
err = device_read((device_t)mp->m_dev, buf, &size, 0);
if (err) {
DPRINTF(("arfs_mount: read error=%d\n", err));
goto out;
}
/* Check if the device includes valid archive image. */
if (strncmp(buf, ARMAG, SARMAG)) {
DPRINTF(("arfs_mount: invalid archive image!\n"));
err = EINVAL;
goto out;
}
/* Ok, we find the archive */
mp->m_flags |= MNT_RDONLY;
out:
free(buf);
return err;
}
static int
arfs_unmount(mount_t mp)
{
return 0;
}