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/* $OpenBSD: sd.c,v 1.6 2014/07/12 18:44:41 tedu Exp $ */
/*
* Copyright (c) 2013 Miodrag Vallat.
*
* 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 <sys/types.h>
#include <sys/param.h>
#include <stand.h>
#include "scsi.h"
int
sdopen(struct open_file *f, const char *ctrlname, int ctrl, int unit, int lun,
int part)
{
struct scsi_private *priv;
struct vdm_label *vdl;
int rc;
char buf[DEV_BSIZE];
char *msg;
size_t z;
f->f_devdata = priv = scsi_initialize(ctrlname, ctrl, unit, lun, part);
if (priv == NULL)
return ENXIO;
/* send TUR */
rc = scsi_tur(priv);
if (rc != 0)
return EIO;
/* read disklabel. We expect a VDM label since this is the only way
* we can boot from disk. */
rc = scsi_read(priv, VDM_LABEL_SECTOR, sizeof buf, buf, &z);
if (rc != 0 || z != sizeof buf)
return EIO;
vdl = (struct vdm_label *)(buf + VDM_LABEL_OFFSET);
if (vdl->signature != VDM_LABEL_SIGNATURE)
vdl = (struct vdm_label *)(buf + VDM_LABEL_OFFSET_ALT);
if (vdl->signature != VDM_LABEL_SIGNATURE)
return EINVAL;
/* XXX ought to search for an OpenBSD vdmpart too. Too lazy for now */
rc = scsi_read(priv, LABELSECTOR, sizeof buf, buf, &z);
if (rc != 0 || z != sizeof buf)
return EIO;
msg = getdisklabel(buf, &priv->label);
if (msg != NULL) {
printf("%s\n", msg);
return EINVAL;
}
return 0;
}
int
sdstrategy(void *devdata, int rw, daddr32_t blk, size_t size, void *buf,
size_t *rsize)
{
struct scsi_private *priv = devdata;
if (rw != F_READ)
return EROFS;
blk += priv->label.d_partitions[priv->part].p_offset;
return scsi_read(priv, blk, size, buf, rsize) != 0 ? EIO : 0;
}
int
sdclose(struct open_file *f)
{
struct scsi_private *priv;
if (f->f_devdata != NULL) {
priv = (struct scsi_private *)f->f_devdata;
if (priv->scsicookie != NULL)
(*priv->scsidetach)(priv->scsicookie);
free(priv, sizeof(struct scsi_private), 0);
f->f_devdata = NULL;
}
return 0;
}
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