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      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 2005 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 #include <regex.h>
     30 #include <devfsadm.h>
     31 #include <stdio.h>
     32 #include <strings.h>
     33 #include <stdlib.h>
     34 #include <limits.h>
     35 #include <sys/mkdev.h>
     36 #include <sys/fs/zfs.h>
     37 
     38 /* zfs and zvol name info */
     39 
     40 #define	ZVOL_LINK_RE_DEVICES	"zvol/r?dsk/.*/.*$"
     41 
     42 static int zfs(di_minor_t minor, di_node_t node);
     43 
     44 /*
     45  * devfs create callback register
     46  */
     47 static devfsadm_create_t zfs_create_cbt[] = {
     48 	{ "pseudo", "ddi_pseudo", ZFS_DRIVER,
     49 	    TYPE_EXACT | DRV_EXACT, ILEVEL_0, zfs,
     50 	},
     51 };
     52 DEVFSADM_CREATE_INIT_V0(zfs_create_cbt);
     53 
     54 /*
     55  * devfs cleanup register
     56  */
     57 static devfsadm_remove_t zfs_remove_cbt[] = {
     58 	{ "pseudo", ZVOL_LINK_RE_DEVICES, RM_HOT | RM_POST,
     59 	    ILEVEL_0, devfsadm_rm_all },
     60 };
     61 DEVFSADM_REMOVE_INIT_V0(zfs_remove_cbt);
     62 
     63 /*
     64  * For the zfs control node:
     65  *	/dev/zfs -> /devices/pseudo/zfs@0:zfs
     66  * For zvols:
     67  *	/dev/zvol/dsk/<pool>/<dataset> -> /devices/pseudo/zfs@0:1
     68  *	/dev/zvol/rdsk/<pool>/<dataset> -> /devices/pseudo/zfs@0:1,raw
     69  */
     70 static int
     71 zfs(di_minor_t minor, di_node_t node)
     72 {
     73 	dev_t	dev;
     74 	int	err;
     75 	char mn[MAXNAMELEN + 1];
     76 	char blkname[MAXNAMELEN + 1];
     77 	char rawname[MAXNAMELEN + 1];
     78 	char path[PATH_MAX + 1];
     79 	char *name;
     80 
     81 	(void) strcpy(mn, di_minor_name(minor));
     82 
     83 	if (strcmp(mn, ZFS_DRIVER) == 0) {
     84 		(void) devfsadm_mklink(ZFS_DRIVER, node, minor, 0);
     85 	} else {
     86 		dev = di_minor_devt(minor);
     87 		err = di_prop_lookup_strings(dev, node, ZVOL_PROP_NAME, &name);
     88 		if (err < 0) {
     89 			/* property not defined so can't do anything */
     90 			return (DEVFSADM_CONTINUE);
     91 		}
     92 		(void) snprintf(blkname, sizeof (blkname), "%dc",
     93 		    (int)minor(dev));
     94 		(void) snprintf(rawname, sizeof (rawname), "%dc,raw",
     95 		    (int)minor(dev));
     96 
     97 		/*
     98 		 * This is where the actual public name gets constructed.
     99 		 * Change the snprintf format to change the public
    100 		 * path that gets constructed.
    101 		 */
    102 		if (strcmp(mn, blkname) == 0) {
    103 			(void) snprintf(path, sizeof (path), "%s/%s",
    104 			    ZVOL_DEV_DIR, name);
    105 		} else if (strcmp(mn, rawname) == 0) {
    106 			(void) snprintf(path, sizeof (path), "%s/%s",
    107 			    ZVOL_RDEV_DIR, name);
    108 		} else {
    109 			return (DEVFSADM_CONTINUE);
    110 		}
    111 
    112 		(void) devfsadm_mklink(path, node, minor, 0);
    113 	}
    114 	return (DEVFSADM_CONTINUE);
    115 }
    116