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dm_dev.c revision 1.1.2.9 
      1 /*        $NetBSD: dm_dev.c,v 1.1.2.9 2008/09/10 18:43:27 haad Exp $      */
      2 
      3 /*
      4  * Copyright (c) 1996, 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Hamsik.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 
     33 #include <sys/types.h>
     34 #include <sys/param.h>
     35 
     36 #include <sys/disklabel.h>
     37 #include <sys/errno.h>
     38 #include <sys/ioctl.h>
     39 #include <sys/ioccom.h>
     40 #include <sys/kmem.h>
     41 #include <sys/lkm.h>
     42 #include <sys/queue.h>
     43 
     44 #include "netbsd-dm.h"
     45 #include "dm.h"
     46 
     47 static struct dm_dev* dm_dev_lookup_name(const char *);
     48 static struct dm_dev* dm_dev_lookup_uuid(const char *);
     49 static struct dm_dev* dm_dev_lookup_minor(int);
     50 
     51 static struct dm_dev_head dm_dev_list =
     52 TAILQ_HEAD_INITIALIZER(dm_dev_list);
     53 
     54 kmutex_t dm_dev_mutex;
     55 
     56 /*
     57  * Locking architecture, for now I use mutexes later we can convert them to
     58  * rw_locks. I use IPL_NONE for specifing IPL type for mutex.
     59  * I will enter into mutex everytime I'm working with dm_dev_list.
     60  */
     61 
     62 /*
     63  * Generic function used to lookup struct dm_dev. Calling with dm_dev_name
     64  * and dm_dev_uuid NULL is allowed.
     65  */
     66 
     67 struct dm_dev*
     68 dm_dev_lookup(const char *dm_dev_name, const char *dm_dev_uuid,
     69  	int dm_dev_minor)
     70 {
     71 	struct dm_dev *dmv;
     72 
     73 	dmv = NULL;
     74 
     75 	if (dm_dev_minor > 0)
     76 		if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL)
     77 			return dmv;
     78 
     79 	if (dm_dev_name != NULL)
     80 		if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL)
     81 			return dmv;
     82 
     83 	if (dm_dev_uuid != NULL)
     84 		if ((dmv = dm_dev_lookup_name(dm_dev_uuid)) != NULL)
     85 			return dmv;
     86 
     87 	return NULL;
     88 }
     89 
     90 
     91 /*
     92  * Lookup device with its minor number.
     93  */
     94 static struct dm_dev*
     95 dm_dev_lookup_minor(int dm_dev_minor)
     96 {
     97 	struct dm_dev *dm_dev;
     98 
     99 	mutex_enter(&dm_dev_mutex);
    100 
    101 	TAILQ_FOREACH(dm_dev, &dm_dev_list, next_devlist){
    102 		if (dm_dev_minor == dm_dev->minor){
    103 			mutex_exit(&dm_dev_mutex);
    104 			return dm_dev;
    105 		}
    106 	}
    107 
    108 	mutex_exit(&dm_dev_mutex);
    109 
    110 	return NULL;
    111 }
    112 
    113 /*
    114  * Lookup device with it's device name.
    115  */
    116 static struct dm_dev*
    117 dm_dev_lookup_name(const char *dm_dev_name)
    118 {
    119 	struct dm_dev *dm_dev;
    120 	int dlen; int slen;
    121 
    122 	slen = strlen(dm_dev_name);
    123 
    124 	if (slen == 0)
    125 		return NULL;
    126 
    127 	mutex_enter(&dm_dev_mutex);
    128 
    129 	TAILQ_FOREACH(dm_dev, &dm_dev_list, next_devlist){
    130 
    131 		dlen = strlen(dm_dev->name);
    132 
    133 		if(slen != dlen)
    134 			continue;
    135 
    136 		if (strncmp(dm_dev_name, dm_dev->name, slen) == 0) {
    137 			mutex_exit(&dm_dev_mutex);
    138 			return dm_dev;
    139 		}
    140 	}
    141 
    142 	mutex_exit(&dm_dev_mutex);
    143 
    144 	return NULL;
    145 }
    146 
    147 /*
    148  * Lookup device with it's device uuid. Used mostly by LVM2tools.
    149  */
    150 static struct dm_dev*
    151 dm_dev_lookup_uuid(const char *dm_dev_uuid)
    152 {
    153 	struct dm_dev *dm_dev;
    154 	size_t len;
    155 
    156 	len = 0;
    157 
    158 	len = strlen(dm_dev_uuid);
    159 
    160 	if (len == 0)
    161 		return NULL;
    162 
    163 	mutex_enter(&dm_dev_mutex);
    164 
    165 	TAILQ_FOREACH(dm_dev, &dm_dev_list, next_devlist){
    166 
    167 		if (strlen(dm_dev->uuid) != len)
    168 			continue;
    169 
    170 		if (strncmp(dm_dev_uuid, dm_dev->uuid, strlen(dm_dev->uuid)) == 0){
    171 			mutex_exit(&dm_dev_mutex);
    172 			return dm_dev;
    173 		}
    174 	}
    175 		mutex_exit(&dm_dev_mutex);
    176 
    177 	return NULL;
    178 }
    179 
    180 /*
    181  * Insert new device to the global list of devices.
    182  */
    183 int
    184 dm_dev_insert(struct dm_dev *dev)
    185 {
    186 	struct dm_dev *dmt;
    187 	int r;
    188 
    189 	dmt = NULL;
    190 	r = 0;
    191 
    192 	if (((dmt = dm_dev_lookup_uuid(dev->uuid)) == NULL) &&
    193 	    ((dmt = dm_dev_lookup_name(dev->name)) == NULL) &&
    194 	    ((dmt = dm_dev_lookup_minor(dev->minor)) == NULL)){
    195 
    196 		mutex_enter(&dm_dev_mutex);
    197 		TAILQ_INSERT_TAIL(&dm_dev_list, dev, next_devlist);
    198 		mutex_exit(&dm_dev_mutex);
    199 	} else
    200 		r = EEXIST;
    201 
    202 	return r;
    203 }
    204 
    205 
    206 /*
    207  * Remove device selected with dm_dev from global list of devices.
    208  */
    209 int
    210 dm_dev_rem(struct dm_dev *dm_dev)
    211 {
    212 	mutex_enter(&dm_dev_mutex);
    213 
    214 	TAILQ_REMOVE(&dm_dev_list, dm_dev, next_devlist);
    215 
    216 	mutex_exit(&dm_dev_mutex);
    217 
    218 	return 0;
    219 }
    220 
    221 /*
    222  * Destroy all devices created in device-mapper. Remove all tables
    223  * free all allocated memmory.
    224  */
    225 
    226 int
    227 dm_dev_destroy(void)
    228 {
    229 	struct dm_dev *dm_dev;
    230 
    231 	/* XXX should I get rw_lock here ? */
    232 	mutex_enter(&dm_dev_mutex);
    233 
    234 	while (TAILQ_FIRST(&dm_dev_list) != NULL){
    235 
    236 		dm_dev = TAILQ_FIRST(&dm_dev_list);
    237 
    238 		TAILQ_REMOVE(&dm_dev_list, TAILQ_FIRST(&dm_dev_list),
    239 		next_devlist);
    240 
    241 		/* Destroy active table first.  */
    242 		if (!SLIST_EMPTY(&dm_dev->tables[dm_dev->cur_active_table]))
    243 			dm_table_destroy(&dm_dev->tables[dm_dev->cur_active_table]);
    244 
    245 		/* Destroy unactive table if exits, too. */
    246 		if (!SLIST_EMPTY(&dm_dev->tables[1 - dm_dev->cur_active_table]))
    247 			dm_table_destroy(&dm_dev->tables[1 - dm_dev->cur_active_table]);
    248 
    249 		(void)kmem_free(dm_dev, sizeof(struct dm_dev));
    250 	}
    251 
    252 	mutex_exit(&dm_dev_mutex);
    253 
    254 	return 0;
    255 }
    256 
    257 /*
    258  * Allocate new device entry.
    259  */
    260 struct dm_dev*
    261 dm_dev_alloc()
    262 {
    263 	return kmem_zalloc(sizeof(struct dm_dev), KM_NOSLEEP);
    264 }
    265 
    266 /*
    267  * Freed device entry.
    268  */
    269 int
    270 dm_dev_free(struct dm_dev *dmv)
    271 {
    272 	if (dmv != NULL)
    273 		(void)kmem_free(dmv, sizeof(struct dm_dev));
    274 
    275 	return 0;
    276 }
    277 
    278 
    279 /*
    280  * Return prop_array of dm_targer_list dictionaries.
    281  */
    282 prop_array_t
    283 dm_dev_prop_list(void)
    284 {
    285 	struct dm_dev *dmd;
    286 
    287 	int j;
    288 
    289 	prop_array_t dev_array;
    290 	prop_dictionary_t dev_dict;
    291 
    292 	j =0;
    293 
    294 	dev_array = prop_array_create();
    295 
    296 	mutex_enter(&dm_dev_mutex);
    297 
    298 	TAILQ_FOREACH(dmd, &dm_dev_list,next_devlist) {
    299 		dev_dict  = prop_dictionary_create();
    300 
    301 		prop_dictionary_set_cstring(dev_dict, DM_DEV_NAME, dmd->name);
    302 
    303 		prop_dictionary_set_uint32(dev_dict, DM_DEV_DEV, dmd->minor);
    304 
    305 		prop_array_set(dev_array, j, dev_dict);
    306 
    307 		prop_object_release(dev_dict);
    308 
    309 		j++;
    310 	}
    311 
    312 	mutex_exit(&dm_dev_mutex);
    313 
    314 	return dev_array;
    315 }
    316 
    317 /*
    318  * Initialize global device mutex.
    319  */
    320 int
    321 dm_dev_init()
    322 {
    323 	TAILQ_INIT(&dm_dev_list); /* initialize global dev list */
    324 
    325 	mutex_init(&dm_dev_mutex, MUTEX_DEFAULT, IPL_NONE);
    326 
    327 	return 0;
    328 }
    329