[dragonfly.git] / sys / dev / disk / dm / targets / striped / dm_target_striped.c

/*
 * Copyright (c) 2009 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Adam Hamsik.
 *
 * This code is further derived from software contributed to the
 * DragonFly project by Alex Hornung and Matthew Dillon
 *
 * 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.
 *
 * $NetBSD: dm_target_stripe.c,v 1.9 2010/01/04 00:14:41 haad Exp $
 */

/*
 * This file implements initial version of device-mapper stripe target.
 *
 * DragonFly changes: Increase to an unlimited number of stripes
 */
#include <sys/types.h>
#include <sys/param.h>

#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/vnode.h>

#include <dev/disk/dm/dm.h>
MALLOC_DEFINE(M_DMSTRIPE, "dm_stripe", "Device Mapper Target Stripe");

static void dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc);

/*
 * 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
 */
static int
dm_target_stripe_init(dm_dev_t *dmv, void **target_config, char *params)
{
	dm_target_stripe_config_t *tsc;
	int n;
	char *ap;

	if (params == NULL)
		return EINVAL;

	/*
	 * nstripes
	 */
	ap = strsep(&params, " \t");
	if (ap == NULL)
		return EINVAL;
	n = (int)atoi64(ap);
	if (n < 0 || n > MAX_STRIPES) {
		kprintf("dm: Error %d stripes not supported (%d max)\n",
			n, MAX_STRIPES);
		return ENOTSUP;
	}

	tsc = kmalloc(sizeof(dm_target_stripe_config_t),
		      M_DMSTRIPE, M_WAITOK | M_ZERO);
	tsc->stripe_num = n;

	ap = strsep(&params, " \t");
	if (ap == NULL)
		return EINVAL;
	tsc->stripe_chunksize = atoi64(ap);
	if (tsc->stripe_chunksize < 1 ||
	    tsc->stripe_chunksize * DEV_BSIZE > MAXPHYS) {
		kprintf("dm: Error unsupported chunk size %jdKB\n",
			(intmax_t)tsc->stripe_chunksize * DEV_BSIZE / 1024);
		dm_target_stripe_destroy_config(tsc);
		return EINVAL;
	}

	/*
	 * Parse the devices
	 */

	kprintf("dm: Stripe %d devices chunk size %dKB\n",
		(int)tsc->stripe_num,
		(int)tsc->stripe_chunksize
	);

	for (n = 0; n < tsc->stripe_num; ++n) {
		ap = strsep(&params, " \t");
		if (ap == NULL)
			break;
		tsc->stripe_devs[n].pdev = dm_pdev_insert(ap);
		if (tsc->stripe_devs[n].pdev == NULL)
			break;
		ap = strsep(&params, " \t");
		if (ap == NULL)
			break;
		tsc->stripe_devs[n].offset = atoi64(ap);
	}
	if (n != tsc->stripe_num) {
		dm_target_stripe_destroy_config(tsc);
		return (ENOENT);
	}

	*target_config = tsc;

	dmv->dev_type = DM_STRIPE_DEV;

	return 0;
}

/*
 * Status routine called to get params string.
 */
static char *
dm_target_stripe_status(void *target_config)
{
	dm_target_stripe_config_t *tsc;
	char *params;
	char *ptr;
	size_t len;
	size_t nlen;
	int n;

	tsc = target_config;

	/* caller expects use of M_DM for returned params */
	nlen = DM_MAX_PARAMS_SIZE;
	params = kmalloc(nlen, M_DM, M_WAITOK);
	ptr = params;

	ksnprintf(ptr, nlen, "%d %jd",
		  tsc->stripe_num, (intmax_t)tsc->stripe_chunksize);
	len = strlen(params);
	ptr += len;
	nlen -= len;

	for (n = 0; n < tsc->stripe_num; ++n) {
		ksnprintf(ptr, nlen, " %s %jd",
			  tsc->stripe_devs[n].pdev->name,
			  (intmax_t)tsc->stripe_devs[n].offset);
		len = strlen(ptr);
		ptr += len;
		nlen -= len;
	}

	return params;
}

/*
 * Strategy routine called from dm_strategy.
 */
static int
dm_target_stripe_strategy(dm_table_entry_t *table_en, struct buf *bp)
{
	dm_target_stripe_config_t *tsc;
	struct bio *bio = &bp->b_bio1;
	struct buf *nestbuf;
	uint64_t blkno, blkoff;
	uint64_t stripe, blknr;
	uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
	int devnr;

	tsc = table_en->target_config;
	if (tsc == NULL)
		return 0;

	/* calculate extent of request */
	KKASSERT(bp->b_resid % DEV_BSIZE == 0);

	switch(bp->b_cmd) {
	case BUF_CMD_READ:
	case BUF_CMD_WRITE:
	case BUF_CMD_FREEBLKS:
		/*
		 * Loop through to individual operations
		 */
		blkno = bp->b_bio1.bio_offset / DEV_BSIZE;
		blkoff = 0;
		num_blks = bp->b_resid / DEV_BSIZE;
		nestiobuf_init(bio);

		while (num_blks > 0) {
			/* blockno to strip piece nr */
			stripe = blkno / tsc->stripe_chunksize;
			stripe_off = blkno % tsc->stripe_chunksize;

			/* where we are inside the strip */
			devnr = stripe % tsc->stripe_num;
			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 = getpbuf(NULL);
			nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;

			nestiobuf_add(bio, nestbuf, blkoff,
					issue_blks * DEV_BSIZE, NULL);

			/* I need number of bytes. */
			nestbuf->b_bio1.bio_offset =
				blknr * tsc->stripe_chunksize + stripe_off;
			nestbuf->b_bio1.bio_offset +=
				tsc->stripe_devs[devnr].offset;
			nestbuf->b_bio1.bio_offset *= DEV_BSIZE;

			vn_strategy(tsc->stripe_devs[devnr].pdev->pdev_vnode,
				    &nestbuf->b_bio1);

			blkno += issue_blks;
			blkoff += issue_blks * DEV_BSIZE;
			num_blks -= issue_blks;
		}
		nestiobuf_start(bio);
		break;
	case BUF_CMD_FLUSH:
		nestiobuf_init(bio);
		for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
			nestbuf = getpbuf(NULL);
			nestbuf->b_flags |= bio->bio_buf->b_flags & B_HASBOGUS;

			nestiobuf_add(bio, nestbuf, 0, 0, NULL);
			nestbuf->b_bio1.bio_offset = 0;
			vn_strategy(tsc->stripe_devs[devnr].pdev->pdev_vnode,
				    &nestbuf->b_bio1);
		}
		nestiobuf_start(bio);
		break;
	default:
		bp->b_flags |= B_ERROR;
		bp->b_error = EIO;
		biodone(bio);
		break;
	}
	return 0;
}


static int
dm_target_stripe_dump(dm_table_entry_t *table_en, void *data, size_t length, off_t offset)
{
	dm_target_stripe_config_t *tsc;
	uint64_t blkno, blkoff;
	uint64_t stripe, blknr;
	uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
	uint64_t off2, len2;
	int devnr;

	tsc = table_en->target_config;
	if (tsc == NULL)
		return 0;

	/* calculate extent of request */
	KKASSERT(length % DEV_BSIZE == 0);

	blkno = offset / DEV_BSIZE;
	blkoff = 0;
	num_blks = length / DEV_BSIZE;

	/*
	 * 0 length means flush buffers and return
	 */
	if (length == 0) {
		for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
			if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
				return ENXIO;

			dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
			    data, 0, offset, 0);
		}
		return 0;
	}

	while (num_blks > 0) {
		/* blockno to strip piece nr */
		stripe = blkno / tsc->stripe_chunksize;
		stripe_off = blkno % tsc->stripe_chunksize;

		/* where we are inside the strip */
		devnr = stripe % tsc->stripe_num;
		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);

#if 0
		nestiobuf_add(bio, nestbuf, blkoff,
				issue_blks * DEV_BSIZE);
#endif
		len2 = issue_blks * DEV_BSIZE;

		/* I need number of bytes. */
		off2 = blknr * tsc->stripe_chunksize + stripe_off;
		off2 += tsc->stripe_devs[devnr].offset;
		off2 *= DEV_BSIZE;
		off2 = dm_pdev_correct_dump_offset(tsc->stripe_devs[devnr].pdev,
		    off2);

		if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
			return ENXIO;

		dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
		    (char *)data + blkoff, 0, off2, len2);

		blkno += issue_blks;
		blkoff += issue_blks * DEV_BSIZE;
		num_blks -= issue_blks;
	}

	return 0;
}

/*
 * Destroy a dm table entry for stripes.
 */
static int
dm_target_stripe_destroy(dm_table_entry_t *table_en)
{
	dm_target_stripe_config_t *tsc;

	if ((tsc = table_en->target_config) != NULL) {
		table_en->target_config = NULL;
		dm_target_stripe_destroy_config(tsc);
	}

	/* Unbusy target so we can unload it */
	dm_target_unbusy(table_en->target);

	return 0;
}

static void
dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc)
{
	int n;

	for (n = 0; n < tsc->stripe_num; ++n) {
		if (tsc->stripe_devs[n].pdev) {
			dm_pdev_decr(tsc->stripe_devs[n].pdev);
			tsc->stripe_devs[n].pdev = NULL;
		}
	}
	kfree(tsc, M_DMSTRIPE);
}

/*
 * Generate properties from stripe table entry.
 */
static 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;
	int n;

	if (table_en->target_config == NULL)
		return ENOENT;

	tsc = table_en->target_config;
	error = 0;
	for (n = 0; n < tsc->stripe_num; ++n) {
		error = VOP_GETATTR(tsc->stripe_devs[n].pdev->pdev_vnode, &va);
		if (error)
			break;
		prop_array_add_uint64(prop_array,
				(uint64_t)makeudev(va.va_rmajor, va.va_rminor));
	}
	return (error);
}

/*
 * Unsupported for this target.
 */
static int
dm_target_stripe_upcall(dm_table_entry_t * table_en, struct buf * bp)
{
	return 0;
}

static int
dmts_mod_handler(module_t mod, int type, void *unused)
{
        dm_target_t *dmt = NULL;
        int err = 0;

        switch(type) {
        case MOD_LOAD:
                if ((dmt = dm_target_lookup("striped")) != NULL) {
                        dm_target_unbusy(dmt);
                        return EEXIST;
                }
                dmt = dm_target_alloc("striped");
                dmt->version[0] = 1;
                dmt->version[1] = 0;
                dmt->version[2] = 3;
                strlcpy(dmt->name, "striped", 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;
                dmt->dump = &dm_target_stripe_dump;

                err = dm_target_insert(dmt);
		if (err == 0)
			kprintf("dm_target_stripe: Successfully initialized\n");
                break;

        case MOD_UNLOAD:
                err = dm_target_rem("striped");
                if (err == 0)
                        kprintf("dm_target_stripe: unloaded\n");
                break;

	default:
		break;
	}

	return err;
}

DM_TARGET_MODULE(dm_target_striped, dmts_mod_handler);
Commit	Line	Data
ff56536e AH	1	/*
	2	* Copyright (c) 2009 The NetBSD Foundation, Inc.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to The NetBSD Foundation
	6	* by Adam Hamsik.
	7	*
1446934e MD	8	* This code is further derived from software contributed to the
	9	* DragonFly project by Alex Hornung and Matthew Dillon
	10	*
ff56536e AH	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in the
	18	* documentation and/or other materials provided with the distribution.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
	21	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
	22	* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	23	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
	24	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	25	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	26	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	27	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	28	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	29	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	30	* POSSIBILITY OF SUCH DAMAGE.
1446934e MD	31	*
1446934e MD	32	* $NetBSD: dm_target_stripe.c,v 1.9 2010/01/04 00:14:41 haad Exp $
ff56536e AH	33	*/
	34
	35	/*
	36	* This file implements initial version of device-mapper stripe target.
1446934e MD	37	*
1446934e MD	38	* DragonFly changes: Increase to an unlimited number of stripes
ff56536e AH	39	*/
	40	#include <sys/types.h>
	41	#include <sys/param.h>
	42
	43	#include <sys/buf.h>
5b279a20	44	#include <sys/malloc.h>
ff56536e AH	45	#include <sys/vnode.h>
ff56536e AH	46
a84e173e	47	#include <dev/disk/dm/dm.h>
5b279a20	48	MALLOC_DEFINE(M_DMSTRIPE, "dm_stripe", "Device Mapper Target Stripe");
ff56536e	49
1446934e MD	50	static void dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc);
1446934e MD	51
ff56536e AH	52	/*
ff56536e AH	53	* Init function called from dm_table_load_ioctl.
1446934e	54	*
ff56536e AH	55	* Example line sent to dm from lvm tools when using striped target.
	56	* start length striped #stripes chunk_size device1 offset1 ... deviceN offsetN
	57	* 0 65536 striped 2 512 /dev/hda 0 /dev/hdb 0
	58	*/
5c411e8e	59	static int
1446934e	60	dm_target_stripe_init(dm_dev_t dmv, void target_config, char params)
ff56536e AH	61	{
ff56536e AH	62	dm_target_stripe_config_t *tsc;
1446934e MD	63	int n;
1446934e MD	64	char *ap;
ff56536e AH	65
	66	if (params == NULL)
	67	return EINVAL;
	68
ff56536e	69	/*
1446934e	70	* nstripes
ff56536e	71	*/
1446934e MD	72	ap = strsep(&params, " \t");
	73	if (ap == NULL)
	74	return EINVAL;
	75	n = (int)atoi64(ap);
	76	if (n < 0 \|\| n > MAX_STRIPES) {
	77	kprintf("dm: Error %d stripes not supported (%d max)\n",
	78	n, MAX_STRIPES);
ff56536e	79	return ENOTSUP;
1446934e	80	}
ff56536e	81
1446934e MD	82	tsc = kmalloc(sizeof(dm_target_stripe_config_t),
	83	M_DMSTRIPE, M_WAITOK \| M_ZERO);
	84	tsc->stripe_num = n;
ff56536e	85
1446934e MD	86	ap = strsep(&params, " \t");
	87	if (ap == NULL)
	88	return EINVAL;
	89	tsc->stripe_chunksize = atoi64(ap);
	90	if (tsc->stripe_chunksize < 1 \|\|
	91	tsc->stripe_chunksize * DEV_BSIZE > MAXPHYS) {
	92	kprintf("dm: Error unsupported chunk size %jdKB\n",
	93	(intmax_t)tsc->stripe_chunksize * DEV_BSIZE / 1024);
	94	dm_target_stripe_destroy_config(tsc);
	95	return EINVAL;
	96	}
ff56536e	97
1446934e MD	98	/*
	99	* Parse the devices
	100	*/
ff56536e	101
1446934e MD	102	kprintf("dm: Stripe %d devices chunk size %dKB\n",
	103	(int)tsc->stripe_num,
	104	(int)tsc->stripe_chunksize
	105	);
ff56536e	106
1446934e MD	107	for (n = 0; n < tsc->stripe_num; ++n) {
	108	ap = strsep(&params, " \t");
	109	if (ap == NULL)
	110	break;
	111	tsc->stripe_devs[n].pdev = dm_pdev_insert(ap);
	112	if (tsc->stripe_devs[n].pdev == NULL)
	113	break;
	114	ap = strsep(&params, " \t");
	115	if (ap == NULL)
	116	break;
	117	tsc->stripe_devs[n].offset = atoi64(ap);
	118	}
	119	if (n != tsc->stripe_num) {
	120	dm_target_stripe_destroy_config(tsc);
	121	return (ENOENT);
	122	}
ff56536e AH	123
	124	*target_config = tsc;
	125
	126	dmv->dev_type = DM_STRIPE_DEV;
	127
	128	return 0;
	129	}
1446934e MD	130
	131	/*
	132	* Status routine called to get params string.
	133	*/
5c411e8e	134	static char *
ff56536e AH	135	dm_target_stripe_status(void *target_config)
	136	{
	137	dm_target_stripe_config_t *tsc;
	138	char *params;
1446934e MD	139	char *ptr;
	140	size_t len;
	141	size_t nlen;
	142	int n;
ff56536e AH	143
	144	tsc = target_config;
	145
1446934e MD	146	/* caller expects use of M_DM for returned params */
	147	nlen = DM_MAX_PARAMS_SIZE;
	148	params = kmalloc(nlen, M_DM, M_WAITOK);
	149	ptr = params;
	150
	151	ksnprintf(ptr, nlen, "%d %jd",
	152	tsc->stripe_num, (intmax_t)tsc->stripe_chunksize);
	153	len = strlen(params);
	154	ptr += len;
	155	nlen -= len;
	156
	157	for (n = 0; n < tsc->stripe_num; ++n) {
	158	ksnprintf(ptr, nlen, " %s %jd",
	159	tsc->stripe_devs[n].pdev->name,
	160	(intmax_t)tsc->stripe_devs[n].offset);
	161	len = strlen(ptr);
	162	ptr += len;
	163	nlen -= len;
	164	}
ff56536e AH	165
	166	return params;
	167	}
1446934e MD	168
	169	/*
	170	* Strategy routine called from dm_strategy.
	171	*/
5c411e8e	172	static int
1446934e	173	dm_target_stripe_strategy(dm_table_entry_t table_en, struct buf bp)
ff56536e AH	174	{
ff56536e AH	175	dm_target_stripe_config_t *tsc;
5b279a20	176	struct bio *bio = &bp->b_bio1;
ff56536e AH	177	struct buf *nestbuf;
ff56536e AH	178	uint64_t blkno, blkoff;
3adc52bc	179	uint64_t stripe, blknr;
ff56536e	180	uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
3adc52bc	181	int devnr;
ff56536e AH	182
	183	tsc = table_en->target_config;
	184	if (tsc == NULL)
	185	return 0;
	186
ff56536e	187	/* calculate extent of request */
5b279a20	188	KKASSERT(bp->b_resid % DEV_BSIZE == 0);
ff56536e	189
3adc52bc MD	190	switch(bp->b_cmd) {
	191	case BUF_CMD_READ:
	192	case BUF_CMD_WRITE:
	193	case BUF_CMD_FREEBLKS:
	194	/*
	195	* Loop through to individual operations
	196	*/
	197	blkno = bp->b_bio1.bio_offset / DEV_BSIZE;
	198	blkoff = 0;
	199	num_blks = bp->b_resid / DEV_BSIZE;
	200	nestiobuf_init(bio);
	201
	202	while (num_blks > 0) {
	203	/* blockno to strip piece nr */
	204	stripe = blkno / tsc->stripe_chunksize;
	205	stripe_off = blkno % tsc->stripe_chunksize;
	206
	207	/* where we are inside the strip */
	208	devnr = stripe % tsc->stripe_num;
	209	blknr = stripe / tsc->stripe_num;
	210
	211	/* how much is left before we hit a boundary */
	212	stripe_rest = tsc->stripe_chunksize - stripe_off;
	213
	214	/* issue this piece on stripe `stripe' */
	215	issue_blks = MIN(stripe_rest, num_blks);
	216	nestbuf = getpbuf(NULL);
f6221ad1	217	nestbuf->b_flags \|= bio->bio_buf->b_flags & B_HASBOGUS;
3adc52bc MD	218
3adc52bc MD	219	nestiobuf_add(bio, nestbuf, blkoff,
3b48c3c1	220	issue_blks * DEV_BSIZE, NULL);
3adc52bc MD	221
	222	/* I need number of bytes. */
	223	nestbuf->b_bio1.bio_offset =
	224	blknr * tsc->stripe_chunksize + stripe_off;
	225	nestbuf->b_bio1.bio_offset +=
	226	tsc->stripe_devs[devnr].offset;
	227	nestbuf->b_bio1.bio_offset *= DEV_BSIZE;
	228
	229	vn_strategy(tsc->stripe_devs[devnr].pdev->pdev_vnode,
	230	&nestbuf->b_bio1);
	231
	232	blkno += issue_blks;
	233	blkoff += issue_blks * DEV_BSIZE;
	234	num_blks -= issue_blks;
	235	}
	236	nestiobuf_start(bio);
	237	break;
	238	case BUF_CMD_FLUSH:
	239	nestiobuf_init(bio);
	240	for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
	241	nestbuf = getpbuf(NULL);
f6221ad1	242	nestbuf->b_flags \|= bio->bio_buf->b_flags & B_HASBOGUS;
3adc52bc	243
3b48c3c1	244	nestiobuf_add(bio, nestbuf, 0, 0, NULL);
3adc52bc MD	245	nestbuf->b_bio1.bio_offset = 0;
	246	vn_strategy(tsc->stripe_devs[devnr].pdev->pdev_vnode,
	247	&nestbuf->b_bio1);
	248	}
	249	nestiobuf_start(bio);
	250	break;
	251	default:
	252	bp->b_flags \|= B_ERROR;
	253	bp->b_error = EIO;
	254	biodone(bio);
	255	break;
ff56536e	256	}
ff56536e AH	257	return 0;
ff56536e AH	258	}
1446934e	259
79b7159f	260
5c411e8e	261	static int
79b7159f AH	262	dm_target_stripe_dump(dm_table_entry_t table_en, void data, size_t length, off_t offset)
	263	{
	264	dm_target_stripe_config_t *tsc;
	265	uint64_t blkno, blkoff;
	266	uint64_t stripe, blknr;
	267	uint32_t stripe_off, stripe_rest, num_blks, issue_blks;
	268	uint64_t off2, len2;
	269	int devnr;
	270
	271	tsc = table_en->target_config;
	272	if (tsc == NULL)
	273	return 0;
	274
	275	/* calculate extent of request */
	276	KKASSERT(length % DEV_BSIZE == 0);
	277
	278	blkno = offset / DEV_BSIZE;
	279	blkoff = 0;
	280	num_blks = length / DEV_BSIZE;
	281
	282	/*
	283	* 0 length means flush buffers and return
	284	*/
	285	if (length == 0) {
	286	for (devnr = 0; devnr < tsc->stripe_num; ++devnr) {
	287	if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
	288	return ENXIO;
	289
	290	dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
	291	data, 0, offset, 0);
	292	}
	293	return 0;
	294	}
	295
	296	while (num_blks > 0) {
	297	/* blockno to strip piece nr */
	298	stripe = blkno / tsc->stripe_chunksize;
	299	stripe_off = blkno % tsc->stripe_chunksize;
	300
	301	/* where we are inside the strip */
	302	devnr = stripe % tsc->stripe_num;
	303	blknr = stripe / tsc->stripe_num;
	304
	305	/* how much is left before we hit a boundary */
	306	stripe_rest = tsc->stripe_chunksize - stripe_off;
	307
	308	/* issue this piece on stripe `stripe' */
	309	issue_blks = MIN(stripe_rest, num_blks);
	310
	311	#if 0
	312	nestiobuf_add(bio, nestbuf, blkoff,
	313	issue_blks * DEV_BSIZE);
	314	#endif
	315	len2 = issue_blks * DEV_BSIZE;
	316
	317	/* I need number of bytes. */
	318	off2 = blknr * tsc->stripe_chunksize + stripe_off;
	319	off2 += tsc->stripe_devs[devnr].offset;
	320	off2 *= DEV_BSIZE;
	321	off2 = dm_pdev_correct_dump_offset(tsc->stripe_devs[devnr].pdev,
	322	off2);
	323
	324	if (tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev == NULL)
	325	return ENXIO;
326
327	dev_ddump(tsc->stripe_devs[devnr].pdev->pdev_vnode->v_rdev,
328	(char *)data + blkoff, 0, off2, len2);
329
330	blkno += issue_blks;
331	blkoff += issue_blks * DEV_BSIZE;
332	num_blks -= issue_blks;
333	}
334
335	return 0;
336	}
337
1446934e MD	338	/*
	339	* Destroy a dm table entry for stripes.
	340	*/
5c411e8e	341	static int
1446934e	342	dm_target_stripe_destroy(dm_table_entry_t *table_en)
ff56536e AH	343	{
	344	dm_target_stripe_config_t *tsc;
	345
1446934e MD	346	if ((tsc = table_en->target_config) != NULL) {
	347	table_en->target_config = NULL;
	348	dm_target_stripe_destroy_config(tsc);
	349	}
ff56536e AH	350
	351	/* Unbusy target so we can unload it */
	352	dm_target_unbusy(table_en->target);
	353
1446934e MD	354	return 0;
1446934e MD	355	}
ff56536e	356
1446934e MD	357	static void
	358	dm_target_stripe_destroy_config(dm_target_stripe_config_t *tsc)
	359	{
	360	int n;
ff56536e	361
1446934e MD	362	for (n = 0; n < tsc->stripe_num; ++n) {
	363	if (tsc->stripe_devs[n].pdev) {
	364	dm_pdev_decr(tsc->stripe_devs[n].pdev);
	365	tsc->stripe_devs[n].pdev = NULL;
	366	}
	367	}
	368	kfree(tsc, M_DMSTRIPE);
ff56536e	369	}
1446934e MD	370
	371	/*
	372	* Generate properties from stripe table entry.
	373	*/
5c411e8e	374	static int
1446934e	375	dm_target_stripe_deps(dm_table_entry_t *table_en, prop_array_t prop_array)
ff56536e AH	376	{
	377	dm_target_stripe_config_t *tsc;
	378	struct vattr va;
ff56536e	379	int error;
1446934e	380	int n;
ff56536e AH	381
	382	if (table_en->target_config == NULL)
	383	return ENOENT;
	384
	385	tsc = table_en->target_config;
1446934e MD	386	error = 0;
	387	for (n = 0; n < tsc->stripe_num; ++n) {
	388	error = VOP_GETATTR(tsc->stripe_devs[n].pdev->pdev_vnode, &va);
	389	if (error)
	390	break;
	391	prop_array_add_uint64(prop_array,
	392	(uint64_t)makeudev(va.va_rmajor, va.va_rminor));
	393	}
	394	return (error);
ff56536e	395	}
1446934e MD	396
	397	/*
	398	* Unsupported for this target.
	399	*/
5c411e8e	400	static int
ff56536e AH	401	dm_target_stripe_upcall(dm_table_entry_t * table_en, struct buf * bp)
	402	{
	403	return 0;
	404	}
5c411e8e AH	405
	406	static int
	407	dmts_mod_handler(module_t mod, int type, void *unused)
	408	{
	409	dm_target_t *dmt = NULL;
	410	int err = 0;
	411
	412	switch(type) {
	413	case MOD_LOAD:
	414	if ((dmt = dm_target_lookup("striped")) != NULL) {
	415	dm_target_unbusy(dmt);
	416	return EEXIST;
	417	}
	418	dmt = dm_target_alloc("striped");
	419	dmt->version[0] = 1;
	420	dmt->version[1] = 0;
	421	dmt->version[2] = 3;
	422	strlcpy(dmt->name, "striped", DM_MAX_TYPE_NAME);
	423	dmt->init = &dm_target_stripe_init;
	424	dmt->status = &dm_target_stripe_status;
	425	dmt->strategy = &dm_target_stripe_strategy;
	426	dmt->deps = &dm_target_stripe_deps;
	427	dmt->destroy = &dm_target_stripe_destroy;
	428	dmt->upcall = &dm_target_stripe_upcall;
	429	dmt->dump = &dm_target_stripe_dump;
	430
	431	err = dm_target_insert(dmt);
	432	if (err == 0)
	433	kprintf("dm_target_stripe: Successfully initialized\n");
	434	break;
	435
	436	case MOD_UNLOAD:
	437	err = dm_target_rem("striped");
	438	if (err == 0)
	439	kprintf("dm_target_stripe: unloaded\n");
	440	break;
	441
	442	default:
	443	break;
	444	}
	445
	446	return err;
	447	}
	448
7115a22b	449	DM_TARGET_MODULE(dm_target_striped, dmts_mod_handler);