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/* $OpenBSD: softraid_raid0.c,v 1.41 2013/06/11 16:42:13 deraadt Exp $ */
/*
* Copyright (c) 2008 Marco Peereboom <marco@peereboom.us>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "bio.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/disk.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/mount.h>
#include <sys/sensors.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_disk.h>
#include <dev/softraidvar.h>
#include <dev/rndvar.h>
/* RAID 0 functions. */
int sr_raid0_create(struct sr_discipline *, struct bioc_createraid *,
int, int64_t);
int sr_raid0_assemble(struct sr_discipline *, struct bioc_createraid *,
int, void *);
int sr_raid0_init(struct sr_discipline *);
int sr_raid0_rw(struct sr_workunit *);
/* Discipline initialisation. */
void
sr_raid0_discipline_init(struct sr_discipline *sd)
{
/* Fill out discipline members. */
sd->sd_type = SR_MD_RAID0;
strlcpy(sd->sd_name, "RAID 0", sizeof(sd->sd_name));
sd->sd_capabilities = SR_CAP_SYSTEM_DISK | SR_CAP_AUTO_ASSEMBLE;
sd->sd_max_wu = SR_RAID0_NOWU;
/* Setup discipline specific function pointers. */
sd->sd_assemble = sr_raid0_assemble;
sd->sd_create = sr_raid0_create;
sd->sd_scsi_rw = sr_raid0_rw;
}
int
sr_raid0_create(struct sr_discipline *sd, struct bioc_createraid *bc,
int no_chunk, int64_t coerced_size)
{
if (no_chunk < 2) {
sr_error(sd->sd_sc, "%s requires two or more chunks",
sd->sd_name);
return EINVAL;
}
/*
* XXX add variable strip size later even though MAXPHYS is really
* the clever value, users like to tinker with that type of stuff.
*/
sd->sd_meta->ssdi.ssd_strip_size = MAXPHYS;
sd->sd_meta->ssdi.ssd_size = (coerced_size &
~((sd->sd_meta->ssdi.ssd_strip_size >> DEV_BSHIFT) - 1)) * no_chunk;
return sr_raid0_init(sd);
}
int
sr_raid0_assemble(struct sr_discipline *sd, struct bioc_createraid *bc,
int no_chunks, void *data)
{
return sr_raid0_init(sd);
}
int
sr_raid0_init(struct sr_discipline *sd)
{
/* Initialise runtime values. */
sd->mds.mdd_raid0.sr0_strip_bits =
sr_validate_stripsize(sd->sd_meta->ssdi.ssd_strip_size);
if (sd->mds.mdd_raid0.sr0_strip_bits == -1) {
sr_error(sd->sd_sc, "invalid strip size", sd->sd_name);
return EINVAL;
}
sd->sd_max_ccb_per_wu =
(MAXPHYS / sd->sd_meta->ssdi.ssd_strip_size + 1) *
SR_RAID0_NOWU * sd->sd_meta->ssdi.ssd_chunk_no;
return 0;
}
int
sr_raid0_rw(struct sr_workunit *wu)
{
struct sr_discipline *sd = wu->swu_dis;
struct scsi_xfer *xs = wu->swu_xs;
struct sr_ccb *ccb;
struct sr_chunk *scp;
daddr_t blk, lbaoffs, strip_no, chunk, stripoffs;
daddr_t strip_size, no_chunk, chunkoffs, physoffs;
daddr_t strip_bits, length, leftover;
u_int8_t *data;
/* blk and scsi error will be handled by sr_validate_io */
if (sr_validate_io(wu, &blk, "sr_raid0_rw"))
goto bad;
strip_size = sd->sd_meta->ssdi.ssd_strip_size;
strip_bits = sd->mds.mdd_raid0.sr0_strip_bits;
no_chunk = sd->sd_meta->ssdi.ssd_chunk_no;
DNPRINTF(SR_D_DIS, "%s: %s: front end io: lba %lld size %d\n",
DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname,
blk, xs->datalen);
/* all offs are in bytes */
lbaoffs = blk << DEV_BSHIFT;
strip_no = lbaoffs >> strip_bits;
chunk = strip_no % no_chunk;
stripoffs = lbaoffs & (strip_size - 1);
chunkoffs = (strip_no / no_chunk) << strip_bits;
physoffs = chunkoffs + stripoffs +
(sd->sd_meta->ssd_data_offset << DEV_BSHIFT);
length = MIN(xs->datalen, strip_size - stripoffs);
leftover = xs->datalen;
data = xs->data;
for (;;) {
/* make sure chunk is online */
scp = sd->sd_vol.sv_chunks[chunk];
if (scp->src_meta.scm_status != BIOC_SDONLINE)
goto bad;
DNPRINTF(SR_D_DIS, "%s: %s %s io lbaoffs %lld "
"strip_no %lld chunk %lld stripoffs %lld "
"chunkoffs %lld physoffs %lld length %lld "
"leftover %lld data %p\n",
DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname, sd->sd_name,
lbaoffs, strip_no, chunk, stripoffs, chunkoffs, physoffs,
length, leftover, data);
blk = physoffs >> DEV_BSHIFT;
ccb = sr_ccb_rw(sd, chunk, blk, length, data, xs->flags, 0);
if (!ccb) {
/* should never happen but handle more gracefully */
printf("%s: %s: too many ccbs queued\n",
DEVNAME(sd->sd_sc),
sd->sd_meta->ssd_devname);
goto bad;
}
sr_wu_enqueue_ccb(wu, ccb);
leftover -= length;
if (leftover == 0)
break;
data += length;
if (++chunk > no_chunk - 1) {
chunk = 0;
physoffs += length;
} else if (wu->swu_io_count == 1)
physoffs -= stripoffs;
length = MIN(leftover,strip_size);
}
sr_schedule_wu(wu);
return (0);
bad:
/* wu is unwound by sr_wu_put */
return (1);
}
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