/*
* Copyright (c) 2009 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dm_target_stripe.c,v 1.45 2024/09/08 09:36:50 rillig Exp $");
/*
* This file implements initial version of device-mapper stripe target.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/lwp.h>
#ifdef DM_TARGET_MODULE
/*
* Every target can be compiled directly to dm driver or as a
* separate module this part of target is used for loading targets
* to dm driver.
* Target can be unloaded from kernel only if there are no users of
* it e.g. there are no devices which uses that target.
*/
#include <sys/kernel.h>
#include <sys/module.h>
/*
* Init function called from dm_table_load_ioctl.
* DM_STRIPE_DEV_OFFSET should always hold the index of the first device-offset
* pair in the parameters.
* Example line sent to dm from lvm tools when using striped target.
* start length striped #stripes chunk_size device1 offset1 ... deviceN offsetN
* 0 65536 striped 2 512 /dev/hda 0 /dev/hdb 0
*/
int
dm_target_stripe_init(dm_table_entry_t *table_en, int argc, char **argv)
{
dm_target_linear_config_t *tlc;
dm_target_stripe_config_t *tsc;
int strpc, strpi;
if (argc < 2) {
printf("Stripe target takes at least 2 args, %d given\n", argc);
return EINVAL;
}
printf("Stripe target init function called!!\n");
printf("Stripe target chunk size %s number of stripes %s\n",
argv[1], argv[0]);
tsc = kmem_alloc(sizeof(*tsc), KM_SLEEP);
/* Initialize linked list for striping devices */
TAILQ_INIT(&tsc->stripe_devs);
/* Save length of param string */
tsc->stripe_chunksize = atoi64(argv[1]);
tsc->stripe_num = (uint8_t) atoi64(argv[0]);
/* Info routine called to get params string. */
char *
dm_target_stripe_info(void *target_config)
{
dm_target_linear_config_t *tlc;
dm_target_stripe_config_t *tsc;
char *params, *ptr, buf[256];
int ret, i = 0;
size_t len;
tsc = target_config;
len = DM_MAX_PARAMS_SIZE;
params = kmem_alloc(len, KM_SLEEP);
ptr = params;
ret = snprintf(ptr, len, "%d ", tsc->stripe_num);
ptr += ret;
len -= ret;
/* Destroy target specific data. */
int
dm_target_stripe_destroy(dm_table_entry_t *table_en)
{
dm_target_stripe_fini(table_en->target_config);
/* Unbusy target so we can unload it */
dm_target_unbusy(table_en->target);
return 0;
}
#if 0
/* Unsupported for this target. */
int
dm_target_stripe_upcall(dm_table_entry_t *table_en, struct buf *bp)
{
return 0;
}
#endif
/*
* Compute physical block size
* For a stripe target we chose the maximum sector size of all
* stripe devices. For the supported power-of-2 sizes this is equivalent
* to the least common multiple.
*/
int
dm_target_stripe_secsize(dm_table_entry_t *table_en, unsigned int *secsizep)
{
dm_target_linear_config_t *tlc;
dm_target_stripe_config_t *tsc;
unsigned int secsize;