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Annotation of prex-old/usr/server/fs/arfs/arfs_vfsops.c, Revision 1.1

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:
        !            30: #include <sys/vnode.h>
        !            31: #include <sys/mount.h>
        !            32: #include <sys/param.h>
        !            33: #include <sys/buf.h>
        !            34:
        !            35: #include <stdlib.h>
        !            36: #include <string.h>
        !            37: #include <errno.h>
        !            38: #include <ar.h>
        !            39:
        !            40: #include "arfs.h"
        !            41:
        !            42: extern struct vnops arfs_vnops;
        !            43:
        !            44:
        !            45: static int arfs_mount(mount_t mp, char *dev, int flags, void *data);
        !            46: static int arfs_unmount(mount_t mp);
        !            47: #define arfs_sync      ((vfsop_sync_t)vfs_nullop)
        !            48: #define arfs_vget      ((vfsop_vget_t)vfs_nullop)
        !            49: #define arfs_statfs    ((vfsop_statfs_t)vfs_nullop)
        !            50:
        !            51: /*
        !            52:  * File system operations
        !            53:  */
        !            54: const struct vfsops arfs_vfsops = {
        !            55:        arfs_mount,             /* mount */
        !            56:        arfs_unmount,           /* unmount */
        !            57:        arfs_sync,              /* sync */
        !            58:        arfs_vget,              /* vget */
        !            59:        arfs_statfs,            /* statfs */
        !            60:        &arfs_vnops,            /* vnops */
        !            61: };
        !            62:
        !            63: /*
        !            64:  * Mount a file system.
        !            65:  */
        !            66: static int
        !            67: arfs_mount(mount_t mp, char *dev, int flags, void *data)
        !            68: {
        !            69:        size_t size;
        !            70:        char *buf;
        !            71:        int err = 0;
        !            72:
        !            73:        dprintf("arfs_mount: dev=%s\n", dev);
        !            74:
        !            75:        if ((buf = malloc(BSIZE)) == NULL)
        !            76:                return ENOMEM;
        !            77:
        !            78:        /* Read first block */
        !            79:        size = BSIZE;
        !            80:        err = device_read((device_t)mp->m_dev, buf, &size, 0);
        !            81:        if (err) {
        !            82:                dprintf("arfs_mount: read error=%d\n", err);
        !            83:                goto out;
        !            84:        }
        !            85:
        !            86:        /* Check if the device includes valid archive image. */
        !            87:        if (strncmp(buf, ARMAG, SARMAG)) {
        !            88:                dprintf("invalid archive image!\n");
        !            89:                err = EINVAL;
        !            90:                goto out;
        !            91:        }
        !            92:
        !            93:        /* Ok, we find the archive */
        !            94:        mp->m_flags |= MNT_RDONLY;
        !            95:  out:
        !            96:        free(buf);
        !            97:        return err;
        !            98: }
        !            99:
        !           100: static int
        !           101: arfs_unmount(mount_t mp)
        !           102: {
        !           103:        return 0;
        !           104: }