Archipelago » blktap-utils

/*

 * Copyright (c) 2010, Citrix Systems, Inc.

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * 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.

 *     * Neither the name of XenSource Inc. nor the names of its contributors

 *       may be used to endorse or promote products derived from this software

 *       without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <errno.h>

#include <limits.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <sys/vfs.h>

#include "tapdisk-storage.h"

#ifndef NFS_SUPER_MAGIC

#define NFS_SUPER_MAGIC 0x6969

#endif

static int

__tapdisk_fs_storage_type(const char *rpath)

{

        struct statfs fst;

        int type, err;

        err = statfs(rpath, &fst);

        if (err)

                return -errno;

        switch (fst.f_type) {

        case NFS_SUPER_MAGIC:

                type = TAPDISK_STORAGE_TYPE_NFS;

                break;

        default:

                type = TAPDISK_STORAGE_TYPE_EXT;

                break;

        }

        return type;

}

static int

__tapdisk_blk_storage_type(const char *rpath)

{

        return TAPDISK_STORAGE_TYPE_LVM;

}

int

tapdisk_storage_type(const char *path)

{

        char rpath[PATH_MAX], *p;

        struct stat st;

        int err, rv;

        p = realpath(path, rpath);

        if (!p)

                return -errno;

        err = stat(rpath, &st);

        if (err)

                return -errno;

        switch (st.st_mode & S_IFMT) {

        case S_IFBLK:

                rv = __tapdisk_blk_storage_type(rpath);

                break;

        case S_IFREG:

                rv = __tapdisk_fs_storage_type(rpath);

                break;

        default:

                rv = -EINVAL;

                break;

        }

        return rv;

}

const char *

tapdisk_storage_name(int type)

{

        switch (type) {

        case TAPDISK_STORAGE_TYPE_NFS:

                return "nfs";

        case TAPDISK_STORAGE_TYPE_EXT:

                return "ext";

        case TAPDISK_STORAGE_TYPE_LVM:

                return "lvm";

        case -1:

                return "n/a";

        default:

                return "<unknown-type>";

        }

}