Home | History | Annotate | Download | only in common
      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 /*
     30  * Checks for a match with the the dump slice.
     31  */
     32 
     33 #include <stdlib.h>
     34 #include <stdio.h>
     35 #include <unistd.h>
     36 #include <string.h>
     37 #include <synch.h>
     38 #include <sys/param.h>
     39 #include <sys/types.h>
     40 #include <sys/stat.h>
     41 #include <fcntl.h>
     42 #include <sys/dumpadm.h>
     43 
     44 #include "libdiskmgt.h"
     45 #include "disks_private.h"
     46 
     47 /* Cached file descriptor for /dev/dump. */
     48 static int		dump_fd = -1;
     49 
     50 static mutex_t		dump_lock = DEFAULTMUTEX;
     51 
     52 /*
     53  * Check the dump device against the input slice.
     54  */
     55 int
     56 inuse_dump(char *slice, nvlist_t *attrs, int *errp)
     57 {
     58 	int		found = 0;
     59 	int		fd;
     60 	char		device[MAXPATHLEN];
     61 
     62 	*errp = 0;
     63 	if (slice == NULL) {
     64 	    return (found);
     65 	}
     66 
     67 	/*
     68 	 * We only want to open /dev/dump once instead of for every
     69 	 * slice so we cache the open file descriptor.  The ioctl
     70 	 * is cheap so we can do that for every slice.
     71 	 */
     72 	(void) mutex_lock(&dump_lock);
     73 
     74 	if (dump_fd == -1) {
     75 		if ((dump_fd = open("/dev/dump", O_RDONLY)) >= 0)
     76 			(void) fcntl(dump_fd, F_SETFD, FD_CLOEXEC);
     77 	}
     78 
     79 	fd = dump_fd;
     80 
     81 	(void) mutex_unlock(&dump_lock);
     82 
     83 	if (fd != -1) {
     84 		if (ioctl(fd, DIOCGETDEV, device) != -1) {
     85 			if (strcmp(slice, device) == 0) {
     86 				libdiskmgt_add_str(attrs, DM_USED_BY,
     87 				    DM_USE_DUMP, errp);
     88 				libdiskmgt_add_str(attrs, DM_USED_NAME,
     89 				    DM_USE_DUMP, errp);
     90 				found = 1;
     91 			}
     92 		}
     93 	}
     94 
     95 	return (found);
     96 }
     97