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