1 /* $NetBSD: dm_target.c,v 1.12 2010/01/04 00:14:41 haad Exp $ */
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
32 #include <sys/types.h>
33 #include <sys/param.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/linker.h>
38 #include <dev/disk/dm/dm.h>
40 #include "netbsd-dm.h"
42 static dm_target_t *dm_target_lookup_name(const char *);
44 TAILQ_HEAD(dm_target_head, dm_target);
46 static struct dm_target_head dm_target_list =
47 TAILQ_HEAD_INITIALIZER(dm_target_list);
49 struct lock dm_target_mutex;
52 * Called indirectly from dm_table_load_ioctl to mark target as used.
55 dm_target_busy(dm_target_t * target)
57 atomic_add_int(&target->ref_cnt, 1);
60 * Release reference counter on target.
63 dm_target_unbusy(dm_target_t * target)
65 KKASSERT(target->ref_cnt > 0);
66 atomic_subtract_int(&target->ref_cnt, 1);
70 * Try to autoload the module for the requested target.
73 dm_target_autoload(const char *dm_target_name)
77 linker_file_t linker_file;
80 ksnprintf(mod_name, sizeof(mod_name), "dm_target_%s", dm_target_name);
81 error = linker_reference_module(mod_name, NULL, &linker_file);
83 kprintf("dm: could not autoload module for target %s\n",
88 dmt = dm_target_lookup(dm_target_name);
90 linker_release_module(NULL, NULL, linker_file);
94 /* XXX: extra-big hack to allow users to kldunload the module */
95 linker_file->userrefs = 1;
101 * Lookup for target in global target list.
104 dm_target_lookup(const char *dm_target_name)
110 if (dm_target_name == NULL)
113 lockmgr(&dm_target_mutex, LK_EXCLUSIVE);
115 dmt = dm_target_lookup_name(dm_target_name);
119 lockmgr(&dm_target_mutex, LK_RELEASE);
124 * Search for name in TAIL and return apropriate pointer.
127 dm_target_lookup_name(const char *dm_target_name)
129 dm_target_t *dm_target;
131 TAILQ_FOREACH(dm_target, &dm_target_list, dm_target_next) {
132 if (strcmp(dm_target_name, dm_target->name) == 0)
139 * Insert new target struct into the TAIL.
141 * contains name, version, function pointer to specifif target functions.
144 dm_target_insert(dm_target_t * dm_target)
148 lockmgr(&dm_target_mutex, LK_EXCLUSIVE);
150 dmt = dm_target_lookup_name(dm_target->name);
152 kprintf("uhoh, target_insert EEXIST\n");
153 lockmgr(&dm_target_mutex, LK_RELEASE);
156 TAILQ_INSERT_TAIL(&dm_target_list, dm_target, dm_target_next);
158 lockmgr(&dm_target_mutex, LK_RELEASE);
165 * Remove target from TAIL, target is selected with it's name.
168 dm_target_rem(char *dm_target_name)
172 KKASSERT(dm_target_name != NULL);
174 lockmgr(&dm_target_mutex, LK_EXCLUSIVE);
176 dmt = dm_target_lookup_name(dm_target_name);
178 lockmgr(&dm_target_mutex, LK_RELEASE);
181 if (dmt->ref_cnt > 0) {
182 lockmgr(&dm_target_mutex, LK_RELEASE);
185 TAILQ_REMOVE(&dm_target_list,
186 dmt, dm_target_next);
188 lockmgr(&dm_target_mutex, LK_RELEASE);
190 (void) kfree(dmt, M_DM);
196 * Allocate new target entry.
199 dm_target_alloc(const char *name)
201 return kmalloc(sizeof(dm_target_t), M_DM, M_WAITOK | M_ZERO);
204 * Return prop_array of dm_target dictionaries.
207 dm_target_prop_list(void)
209 prop_array_t target_array, ver;
210 prop_dictionary_t target_dict;
211 dm_target_t *dm_target;
215 target_array = prop_array_create();
217 lockmgr(&dm_target_mutex, LK_EXCLUSIVE);
219 TAILQ_FOREACH(dm_target, &dm_target_list, dm_target_next) {
221 target_dict = prop_dictionary_create();
222 ver = prop_array_create();
223 prop_dictionary_set_cstring(target_dict, DM_TARGETS_NAME,
226 for (i = 0; i < 3; i++)
227 prop_array_add_uint32(ver, dm_target->version[i]);
229 prop_dictionary_set(target_dict, DM_TARGETS_VERSION, ver);
230 prop_array_add(target_array, target_dict);
232 prop_object_release(ver);
233 prop_object_release(target_dict);
236 lockmgr(&dm_target_mutex, LK_RELEASE);
241 /* Initialize dm_target subsystem. */
245 lockinit(&dm_target_mutex, "dmtrgt", 0, LK_CANRECURSE);
251 * Destroy all targets and remove them from queue.
252 * This routine is called from dm_detach, before module
256 dm_target_uninit(void)
258 dm_target_t *dm_target;
260 lockmgr(&dm_target_mutex, LK_EXCLUSIVE);
261 while (TAILQ_FIRST(&dm_target_list) != NULL) {
263 dm_target = TAILQ_FIRST(&dm_target_list);
265 TAILQ_REMOVE(&dm_target_list, TAILQ_FIRST(&dm_target_list),
268 (void) kfree(dm_target, M_DM);
270 lockmgr(&dm_target_mutex, LK_RELEASE);
272 lockuninit(&dm_target_mutex);