311 lines
8.4 KiB
C
311 lines
8.4 KiB
C
/*$NetBSD: dm_target_stripe.c,v 1.7 2009/09/09 22:38:49 haad Exp $*/
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* 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/vnode.h>
|
|
|
|
#include "dm.h"
|
|
#include "netbsd-dm.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>
|
|
|
|
MODULE(MODULE_CLASS_MISC, dm_target_stripe, NULL);
|
|
|
|
static int
|
|
dm_target_stripe_modcmd(modcmd_t cmd, void *arg)
|
|
{
|
|
dm_target_t *dmt;
|
|
int r;
|
|
dmt = NULL;
|
|
|
|
switch (cmd) {
|
|
case MODULE_CMD_INIT:
|
|
if ((dmt = dm_target_lookup("stripe")) != NULL) {
|
|
dm_target_unbusy(dmt);
|
|
return EEXIST;
|
|
}
|
|
|
|
dmt = dm_target_alloc("stripe");
|
|
|
|
dmt->version[0] = 1;
|
|
dmt->version[1] = 0;
|
|
dmt->version[2] = 0;
|
|
strlcpy(dmt->name, "stripe", DM_MAX_TYPE_NAME);
|
|
dmt->init = &dm_target_stripe_init;
|
|
dmt->status = &dm_target_stripe_status;
|
|
dmt->strategy = &dm_target_stripe_strategy;
|
|
dmt->deps = &dm_target_stripe_deps;
|
|
dmt->destroy = &dm_target_stripe_destroy;
|
|
dmt->upcall = &dm_target_stripe_upcall;
|
|
|
|
r = dm_target_insert(dmt);
|
|
|
|
break;
|
|
|
|
case MODULE_CMD_FINI:
|
|
r = dm_target_rem("stripe");
|
|
break;
|
|
|
|
case MODULE_CMD_STAT:
|
|
return ENOTTY;
|
|
|
|
default:
|
|
return ENOTTY;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Init function called from dm_table_load_ioctl.
|
|
* 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_dev_t *dmv, void **target_config, prop_dictionary_t dict)
|
|
{
|
|
dm_target_stripe_config_t *tsc;
|
|
prop_array_t dev_array;
|
|
prop_dictionary_t dev_dict1, dev_dict2;
|
|
|
|
uint64_t stripes, chunk_size, offset1, offset2;
|
|
const char *device1, *device2;
|
|
|
|
if (prop_dictionary_get_uint64(dict, DM_TARGET_STRIPE_STRIPES,
|
|
&stripes) == false)
|
|
return EINVAL;
|
|
|
|
if (prop_dictionary_get_uint64(dict, DM_TARGET_STRIPE_CHUNKSIZE,
|
|
&chunk_size) == false)
|
|
return EINVAL;
|
|
|
|
dev_array = prop_dictionary_get(dict, DM_TARGET_STRIPE_DEVARRAY);
|
|
|
|
/* XXX Support for more than 2 devices */
|
|
dev_dict1 = prop_array_get(dev_array, 0);
|
|
dev_dict2 = prop_array_get(dev_array, 1);
|
|
|
|
if(dev_dict2 == NULL || dev_dict1 == NULL)
|
|
return EINVAL;
|
|
|
|
prop_dictionary_get_cstring_nocopy(dev_dict1, DM_TARGET_STRIPE_DEVICE, &device1);
|
|
prop_dictionary_get_uint64(dev_dict1, DM_TARGET_STRIPE_OFFSET, &offset1);
|
|
prop_dictionary_get_cstring_nocopy(dev_dict2, DM_TARGET_STRIPE_DEVICE, &device2);
|
|
prop_dictionary_get_uint64(dev_dict2, DM_TARGET_STRIPE_OFFSET, &offset2);
|
|
|
|
aprint_debug("Stripe target init function called!!\n");
|
|
|
|
aprint_debug("Stripe target chunk size %"PRIu64" number of stripes %"PRIu64"\n", chunk_size, stripes);
|
|
aprint_debug("Stripe target device name %s -- offset %"PRIu64"\n", device1, offset1);
|
|
aprint_debug("Stripe target device name %s -- offset %"PRIu64"\n", device2, offset2);
|
|
|
|
if (stripes > MAX_STRIPES)
|
|
return ENOTSUP;
|
|
|
|
if ((tsc = kmem_alloc(sizeof(dm_target_stripe_config_t), KM_NOSLEEP))
|
|
== NULL)
|
|
return ENOMEM;
|
|
|
|
/* Insert dmp to global pdev list */
|
|
if ((tsc->stripe_devs[0].pdev = dm_pdev_insert(device1)) == NULL)
|
|
return ENOENT;
|
|
|
|
/* Insert dmp to global pdev list */
|
|
if ((tsc->stripe_devs[1].pdev = dm_pdev_insert(device2)) == NULL)
|
|
return ENOENT;
|
|
|
|
tsc->stripe_devs[0].offset = offset1;
|
|
tsc->stripe_devs[1].offset = offset2;
|
|
|
|
tsc->stripe_chunksize = chunk_size;
|
|
tsc->stripe_num = (uint8_t)stripes;
|
|
|
|
*target_config = tsc;
|
|
|
|
dmv->dev_type = DM_STRIPE_DEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Status routine called to get params string. */
|
|
char *
|
|
dm_target_stripe_status(void *target_config)
|
|
{
|
|
dm_target_stripe_config_t *tsc;
|
|
char *params;
|
|
|
|
tsc = target_config;
|
|
|
|
if ((params = kmem_alloc(DM_MAX_PARAMS_SIZE, KM_SLEEP)) == NULL)
|
|
return NULL;
|
|
|
|
snprintf(params, DM_MAX_PARAMS_SIZE, "%d %"PRIu64" %s %"PRIu64" %s %"PRIu64,
|
|
tsc->stripe_num, tsc->stripe_chunksize,
|
|
tsc->stripe_devs[0].pdev->name, tsc->stripe_devs[0].offset,
|
|
tsc->stripe_devs[1].pdev->name, tsc->stripe_devs[1].offset);
|
|
|
|
return params;
|
|
}
|
|
|
|
/* Strategy routine called from dm_strategy. */
|
|
int
|
|
dm_target_stripe_strategy(dm_table_entry_t *table_en, struct buf *bp)
|
|
{
|
|
dm_target_stripe_config_t *tsc;
|
|
struct buf *nestbuf;
|
|
uint64_t blkno, blkoff;
|
|
uint64_t stripe, stripe_blknr;
|
|
uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
|
|
int stripe_devnr;
|
|
|
|
tsc = table_en->target_config;
|
|
if (tsc == NULL)
|
|
return 0;
|
|
|
|
/* aprint_debug("Stripe target read function called %" PRIu64 "!!\n",
|
|
tlc->offset);*/
|
|
|
|
/* calculate extent of request */
|
|
KASSERT(bp->b_resid % DEV_BSIZE == 0);
|
|
|
|
blkno = bp->b_blkno;
|
|
blkoff = 0;
|
|
num_blks = bp->b_resid / DEV_BSIZE;
|
|
for (;;) {
|
|
/* blockno to strip piece nr */
|
|
stripe = blkno / tsc->stripe_chunksize;
|
|
stripe_off = blkno % tsc->stripe_chunksize;
|
|
|
|
/* where we are inside the strip */
|
|
stripe_devnr = stripe % tsc->stripe_num;
|
|
stripe_blknr = stripe / tsc->stripe_num;
|
|
|
|
/* how much is left before we hit a boundary */
|
|
stripe_rest = tsc->stripe_chunksize - stripe_off;
|
|
|
|
/* issue this piece on stripe `stripe' */
|
|
issue_blks = MIN(stripe_rest, num_blks);
|
|
nestbuf = getiobuf(NULL, true);
|
|
|
|
nestiobuf_setup(bp, nestbuf, blkoff, issue_blks * DEV_BSIZE);
|
|
nestbuf->b_blkno = stripe_blknr * tsc->stripe_chunksize + stripe_off;
|
|
nestbuf->b_blkno += tsc->stripe_devs[stripe_devnr].offset;
|
|
|
|
VOP_STRATEGY(tsc->stripe_devs[stripe_devnr].pdev->pdev_vnode, nestbuf);
|
|
|
|
blkno += issue_blks;
|
|
blkoff += issue_blks * DEV_BSIZE;
|
|
num_blks -= issue_blks;
|
|
|
|
if (num_blks <= 0)
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Doesn't do anything here. */
|
|
int
|
|
dm_target_stripe_destroy(dm_table_entry_t *table_en)
|
|
{
|
|
dm_target_stripe_config_t *tsc;
|
|
|
|
tsc = table_en->target_config;
|
|
|
|
if (tsc == NULL)
|
|
return 0;
|
|
|
|
dm_pdev_decr(tsc->stripe_devs[0].pdev);
|
|
dm_pdev_decr(tsc->stripe_devs[1].pdev);
|
|
|
|
/* Unbusy target so we can unload it */
|
|
dm_target_unbusy(table_en->target);
|
|
|
|
kmem_free(tsc, sizeof(dm_target_stripe_config_t));
|
|
|
|
table_en->target_config = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Doesn't not need to do anything here. */
|
|
int
|
|
dm_target_stripe_deps(dm_table_entry_t *table_en, prop_array_t prop_array)
|
|
{
|
|
dm_target_stripe_config_t *tsc;
|
|
struct vattr va;
|
|
|
|
int error;
|
|
|
|
if (table_en->target_config == NULL)
|
|
return ENOENT;
|
|
|
|
tsc = table_en->target_config;
|
|
|
|
if ((error = VOP_GETATTR(tsc->stripe_devs[0].pdev->pdev_vnode, &va, curlwp->l_cred)) != 0)
|
|
return error;
|
|
|
|
prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev);
|
|
|
|
if ((error = VOP_GETATTR(tsc->stripe_devs[1].pdev->pdev_vnode, &va, curlwp->l_cred)) != 0)
|
|
return error;
|
|
|
|
prop_array_add_uint64(prop_array, (uint64_t)va.va_rdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Unsupported for this target. */
|
|
int
|
|
dm_target_stripe_upcall(dm_table_entry_t *table_en, struct buf *bp)
|
|
{
|
|
return 0;
|
|
}
|