meta_admin.c revision 2
2N/A/*
2N/A * CDDL HEADER START
2N/A *
2N/A * The contents of this file are subject to the terms of the
2N/A * Common Development and Distribution License, Version 1.0 only
2N/A * (the "License"). You may not use this file except in compliance
2N/A * with the License.
2N/A *
2N/A * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
2N/A * or http://www.opensolaris.org/os/licensing.
2N/A * See the License for the specific language governing permissions
2N/A * and limitations under the License.
2N/A *
2N/A * When distributing Covered Code, include this CDDL HEADER in each
2N/A * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
2N/A * If applicable, add the following below this CDDL HEADER, with the
2N/A * fields enclosed by brackets "[]" replaced with your own identifying
2N/A * information: Portions Copyright [yyyy] [name of copyright owner]
2N/A *
2N/A * CDDL HEADER END
2N/A */
2N/A/*
2N/A * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
2N/A * Use is subject to license terms.
2N/A */
2N/A
2N/A#pragma ident "%Z%%M% %I% %E% SMI"
2N/A
2N/A
2N/A/*
2N/A * miscellaneous utilities
2N/A */
2N/A
2N/A#include <meta.h>
2N/A#include <zone.h>
2N/A
2N/Astatic int meta_fd = -1;
2N/Astatic major_t meta_major;
2N/A
2N/A/*
2N/A * open administrative device
2N/A */
2N/Aint
2N/Aopen_admin(
2N/A md_error_t *ep
2N/A)
2N/A{
2N/A struct stat buf;
2N/A
2N/A /* if not already open */
2N/A if (meta_fd < 0) {
2N/A ulong_t dversion = 0;
2N/A
2N/A /* try read/write fall back to readonly */
2N/A if ((meta_fd = open(ADMSPECIAL, O_RDWR, 0)) < 0) {
2N/A if (errno == ENOENT && getzoneid() != GLOBAL_ZONEID)
2N/A return (mderror(ep, MDE_ZONE_ADMIN, NULL));
2N/A if (errno != EACCES)
2N/A return (mdsyserror(ep, errno, ADMSPECIAL));
2N/A if ((meta_fd = open(ADMSPECIAL, O_RDONLY, 0)) < 0)
2N/A return (mdsyserror(ep, errno, ADMSPECIAL));
2N/A }
2N/A
/* 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);
}