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mirror of https://git.FreeBSD.org/src.git synced 2024-12-23 11:18:54 +00:00
freebsd/usr.sbin/fstyp/zfs.c
Xin LI 4b43341dea Eliminate unneeded copying of vdev data, goto, etc. and add a note
that checksum of vdev label should be checked (which is not done
currently).

No functional change.

While I'm there, raise WARNS to 2.

Reviewed by:	allanjude
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D3508
2015-09-17 20:55:47 +00:00

76 lines
2.4 KiB
C

/*-
* Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
* Copyright (c) 2015 Xin LI <delphij@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libnvpair.h>
#include <sys/vdev_impl.h>
#include "fstyp.h"
int
fstyp_zfs(FILE *fp, char *label, size_t labelsize)
{
vdev_label_t *vdev_label = NULL;
vdev_phys_t *vdev_phys;
char *zpool_name = NULL;
nvlist_t *config = NULL;
int err = 0;
/*
* Read in the first ZFS vdev label ("L0"), located at the beginning
* of the vdev and extract the pool name from it.
*
* TODO: the checksum of label should be validated.
*/
vdev_label = (vdev_label_t *)read_buf(fp, 0, sizeof(*vdev_label));
if (vdev_label == NULL)
return (1);
vdev_phys = &(vdev_label->vl_vdev_phys);
if ((nvlist_unpack(vdev_phys->vp_nvlist, sizeof(vdev_phys->vp_nvlist),
&config, 0)) == 0 &&
(nvlist_lookup_string(config, "name", &zpool_name) == 0)) {
strlcpy(label, zpool_name, labelsize);
} else
err = 1;
nvlist_free(config);
free(vdev_label);
return (err);
}