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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* miscellaneous utilities
*/
#include <meta.h>
#include <zone.h>
static int meta_fd = -1;
static major_t meta_major;
/*
* open administrative device
*/
int
open_admin(
md_error_t *ep
)
{
struct stat buf;
/* if not already open */
if (meta_fd < 0) {
ulong_t dversion = 0;
/* try read/write fall back to readonly */
if ((meta_fd = open(ADMSPECIAL, O_RDWR, 0)) < 0) {
if (errno == ENOENT && getzoneid() != GLOBAL_ZONEID)
return (mderror(ep, MDE_ZONE_ADMIN, NULL));
if (errno != EACCES)
return (mdsyserror(ep, errno, ADMSPECIAL));
if ((meta_fd = open(ADMSPECIAL, O_RDONLY, 0)) < 0)
return (mdsyserror(ep, errno, ADMSPECIAL));
}
/* get major */
if (fstat(meta_fd, &buf) != 0)
return (mdsyserror(ep, errno, ADMSPECIAL));
meta_major = major(buf.st_rdev);
/* check driver version */
if (metaioctl(MD_IOCGVERSION, &dversion, ep, NULL) != 0)
return (-1);
if (dversion != MD_DVERSION)
return (mderror(ep, MDE_DVERSION, NULL));
}
/* return fd */
return (meta_fd);
}
int
close_admin(
md_error_t *ep
)
{
if (meta_fd >= 0) {
if (close(meta_fd) == -1)
return (mdsyserror(ep, errno, ADMSPECIAL));
meta_fd = -1;
}
return (0);
}
/*
* Returns True if the md_dev64_t passed in is a metadevice.
* Else it returns False.
*/
int
meta_dev_ismeta(
md_dev64_t dev
)
{
int fd;
md_error_t status = mdnullerror;
fd = open_admin(&status);
assert(fd >= 0);
return (meta_getmajor(dev) == meta_major);
}
int
meta_get_nunits(md_error_t *ep)
{
static set_t max_nunits = 0;
if (max_nunits == 0)
if (metaioctl(MD_IOCGETNUNITS, &max_nunits, ep, NULL) != 0)
return (-1);
return (max_nunits);
}
md_dev64_t
metamakedev(minor_t mnum)
{
int fd;
md_error_t status = mdnullerror;
fd = open_admin(&status);
assert(fd >= 0);
return (((md_dev64_t)meta_major << NBITSMINOR64) | mnum);
}
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