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Annotation of prex-old/usr/server/fs/arfs/arfs_vfsops.c, Revision 1.1.1.1.2.1

1.1       nbrk        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:
1.1.1.1.2.1! nbrk       30: /*
        !            31:  * arfs_vfsops.c - vfs operations for archive file system.
        !            32:  */
        !            33:
1.1       nbrk       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:
1.1.1.1.2.1! nbrk       49: static int arfs_mount  (mount_t mp, char *dev, int flags, void *data);
        !            50: static int arfs_unmount        (mount_t mp);
1.1       nbrk       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 err = 0;
                     76:
1.1.1.1.2.1! nbrk       77:        DPRINTF(("arfs_mount: dev=%s\n", dev));
1.1       nbrk       78:
                     79:        if ((buf = malloc(BSIZE)) == NULL)
                     80:                return ENOMEM;
                     81:
                     82:        /* Read first block */
                     83:        size = BSIZE;
                     84:        err = device_read((device_t)mp->m_dev, buf, &size, 0);
                     85:        if (err) {
1.1.1.1.2.1! nbrk       86:                DPRINTF(("arfs_mount: read error=%d\n", err));
1.1       nbrk       87:                goto out;
                     88:        }
                     89:
                     90:        /* Check if the device includes valid archive image. */
                     91:        if (strncmp(buf, ARMAG, SARMAG)) {
1.1.1.1.2.1! nbrk       92:                DPRINTF(("arfs_mount: invalid archive image!\n"));
1.1       nbrk       93:                err = 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 err;
                    102: }
                    103:
                    104: static int
                    105: arfs_unmount(mount_t mp)
                    106: {
                    107:        return 0;
                    108: }