NetBSD/sys/dev/dm/dm_dev.c

403 lines
8.5 KiB
C

/* $NetBSD: dm_dev.c,v 1.9 2014/10/18 08:33:27 snj Exp $ */
/*
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Hamsik.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/ioccom.h>
#include <sys/kmem.h>
#include "netbsd-dm.h"
#include "dm.h"
static dm_dev_t *dm_dev_lookup_name(const char *);
static dm_dev_t *dm_dev_lookup_uuid(const char *);
static dm_dev_t *dm_dev_lookup_minor(int);
static struct dm_dev_head dm_dev_list =
TAILQ_HEAD_INITIALIZER(dm_dev_list);
kmutex_t dm_dev_mutex;
/* dm_dev_mutex must be holdby caller before using disable_dev. */
__inline static void
disable_dev(dm_dev_t * dmv)
{
TAILQ_REMOVE(&dm_dev_list, dmv, next_devlist);
mutex_enter(&dmv->dev_mtx);
mutex_exit(&dm_dev_mutex);
while (dmv->ref_cnt != 0)
cv_wait(&dmv->dev_cv, &dmv->dev_mtx);
mutex_exit(&dmv->dev_mtx);
}
/*
* Generic function used to lookup dm_dev_t. Calling with dm_dev_name
* and dm_dev_uuid NULL is allowed.
*/
dm_dev_t *
dm_dev_lookup(const char *dm_dev_name, const char *dm_dev_uuid,
int dm_dev_minor)
{
dm_dev_t *dmv;
dmv = NULL;
mutex_enter(&dm_dev_mutex);
/* KASSERT(dm_dev_name != NULL && dm_dev_uuid != NULL && dm_dev_minor
* > 0); */
if (dm_dev_minor > 0)
if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) {
dm_dev_busy(dmv);
mutex_exit(&dm_dev_mutex);
return dmv;
}
if (dm_dev_name != NULL)
if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) {
dm_dev_busy(dmv);
mutex_exit(&dm_dev_mutex);
return dmv;
}
if (dm_dev_uuid != NULL)
if ((dmv = dm_dev_lookup_uuid(dm_dev_uuid)) != NULL) {
dm_dev_busy(dmv);
mutex_exit(&dm_dev_mutex);
return dmv;
}
mutex_exit(&dm_dev_mutex);
return NULL;
}
/*
* Lookup device with its minor number.
*/
static dm_dev_t *
dm_dev_lookup_minor(int dm_dev_minor)
{
dm_dev_t *dmv;
TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
if (dm_dev_minor == dmv->minor)
return dmv;
}
return NULL;
}
/*
* Lookup device with its device name.
*/
static dm_dev_t *
dm_dev_lookup_name(const char *dm_dev_name)
{
dm_dev_t *dmv;
int dlen;
int slen;
slen = strlen(dm_dev_name);
if (slen == 0)
return NULL;
TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
dlen = strlen(dmv->name);
if (slen != dlen)
continue;
if (strncmp(dm_dev_name, dmv->name, slen) == 0)
return dmv;
}
return NULL;
}
/*
* Lookup device with its device uuid. Used mostly by LVM2tools.
*/
static dm_dev_t *
dm_dev_lookup_uuid(const char *dm_dev_uuid)
{
dm_dev_t *dmv;
size_t len;
len = 0;
len = strlen(dm_dev_uuid);
if (len == 0)
return NULL;
TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
if (strlen(dmv->uuid) != len)
continue;
if (strncmp(dm_dev_uuid, dmv->uuid, strlen(dmv->uuid)) == 0)
return dmv;
}
return NULL;
}
/*
* Insert new device to the global list of devices.
*/
int
dm_dev_insert(dm_dev_t * dev)
{
dm_dev_t *dmv;
int r;
dmv = NULL;
r = 0;
KASSERT(dev != NULL);
mutex_enter(&dm_dev_mutex);
if (((dmv = dm_dev_lookup_uuid(dev->uuid)) == NULL) &&
((dmv = dm_dev_lookup_name(dev->name)) == NULL) &&
((dmv = dm_dev_lookup_minor(dev->minor)) == NULL)) {
TAILQ_INSERT_TAIL(&dm_dev_list, dev, next_devlist);
} else
r = EEXIST;
mutex_exit(&dm_dev_mutex);
return r;
}
#ifdef notyet
/*
* Lookup device with its minor number.
*/
int
dm_dev_test_minor(int dm_dev_minor)
{
dm_dev_t *dmv;
mutex_enter(&dm_dev_mutex);
TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
if (dm_dev_minor == dmv->minor) {
mutex_exit(&dm_dev_mutex);
return 1;
}
}
mutex_exit(&dm_dev_mutex);
return 0;
}
#endif
/*
* dm_dev_lookup_devt look for selected device_t. We keep this routine
* outside of dm_dev_lookup because it is a temporally solution.
*
* TODO: This is a hack autoconf should be more flexible.
*/
dm_dev_t *
dm_dev_detach(device_t devt)
{
dm_dev_t *dmv;
mutex_enter(&dm_dev_mutex);
TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
if (devt == dmv->devt) {
disable_dev(dmv);
return dmv;
}
}
mutex_exit(&dm_dev_mutex);
return NULL;
}
/*
* Remove device selected with dm_dev from global list of devices.
*/
dm_dev_t *
dm_dev_rem(const char *dm_dev_name, const char *dm_dev_uuid,
int dm_dev_minor)
{
dm_dev_t *dmv;
dmv = NULL;
mutex_enter(&dm_dev_mutex);
if (dm_dev_minor > 0)
if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) {
disable_dev(dmv);
return dmv;
}
if (dm_dev_name != NULL)
if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) {
disable_dev(dmv);
return dmv;
}
if (dm_dev_uuid != NULL)
if ((dmv = dm_dev_lookup_name(dm_dev_uuid)) != NULL) {
disable_dev(dmv);
return dmv;
}
mutex_exit(&dm_dev_mutex);
return NULL;
}
/*
* Destroy all devices created in device-mapper. Remove all tables
* free all allocated memmory.
*/
int
dm_dev_destroy(void)
{
dm_dev_t *dmv;
mutex_enter(&dm_dev_mutex);
while (TAILQ_FIRST(&dm_dev_list) != NULL) {
dmv = TAILQ_FIRST(&dm_dev_list);
TAILQ_REMOVE(&dm_dev_list, TAILQ_FIRST(&dm_dev_list),
next_devlist);
mutex_enter(&dmv->dev_mtx);
while (dmv->ref_cnt != 0)
cv_wait(&dmv->dev_cv, &dmv->dev_mtx);
/* Destroy active table first. */
dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE);
/* Destroy inactive table if exits, too. */
dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
dm_table_head_destroy(&dmv->table_head);
mutex_exit(&dmv->dev_mtx);
mutex_destroy(&dmv->dev_mtx);
cv_destroy(&dmv->dev_cv);
(void) kmem_free(dmv, sizeof(dm_dev_t));
}
mutex_exit(&dm_dev_mutex);
mutex_destroy(&dm_dev_mutex);
return 0;
}
/*
* Allocate new device entry.
*/
dm_dev_t *
dm_dev_alloc(void)
{
dm_dev_t *dmv;
dmv = kmem_zalloc(sizeof(dm_dev_t), KM_SLEEP);
if (dmv != NULL)
dmv->diskp = kmem_zalloc(sizeof(struct disk), KM_SLEEP);
return dmv;
}
/*
* Freed device entry.
*/
int
dm_dev_free(dm_dev_t * dmv)
{
KASSERT(dmv != NULL);
mutex_destroy(&dmv->dev_mtx);
mutex_destroy(&dmv->diskp_mtx);
cv_destroy(&dmv->dev_cv);
if (dmv->diskp != NULL)
(void) kmem_free(dmv->diskp, sizeof(struct disk));
(void) kmem_free(dmv, sizeof(dm_dev_t));
return 0;
}
void
dm_dev_busy(dm_dev_t * dmv)
{
mutex_enter(&dmv->dev_mtx);
dmv->ref_cnt++;
mutex_exit(&dmv->dev_mtx);
}
void
dm_dev_unbusy(dm_dev_t * dmv)
{
KASSERT(dmv->ref_cnt != 0);
mutex_enter(&dmv->dev_mtx);
if (--dmv->ref_cnt == 0)
cv_broadcast(&dmv->dev_cv);
mutex_exit(&dmv->dev_mtx);
}
/*
* Return prop_array of dm_targer_list dictionaries.
*/
prop_array_t
dm_dev_prop_list(void)
{
dm_dev_t *dmv;
prop_array_t dev_array;
prop_dictionary_t dev_dict;
dev_array = prop_array_create();
mutex_enter(&dm_dev_mutex);
TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
dev_dict = prop_dictionary_create();
prop_dictionary_set_cstring(dev_dict, DM_DEV_NAME, dmv->name);
prop_dictionary_set_uint32(dev_dict, DM_DEV_DEV, dmv->minor);
prop_array_add(dev_array, dev_dict);
prop_object_release(dev_dict);
}
mutex_exit(&dm_dev_mutex);
return dev_array;
}
/*
* Initialize global device mutex.
*/
int
dm_dev_init(void)
{
TAILQ_INIT(&dm_dev_list); /* initialize global dev list */
mutex_init(&dm_dev_mutex, MUTEX_DEFAULT, IPL_NONE);
return 0;
}