NetBSD/sys/dev/ata/ata_raid_subr.c

102 lines
3.2 KiB
C

/* $NetBSD: ata_raid_subr.c,v 1.1 2008/09/16 11:45:30 tron Exp $ */
/*-
* Copyright (c) 2008 Juan Romero Pardines.
* All rights reserved.
*
* 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 AUTHOR ``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 AUTHOR 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: ata_raid_subr.c,v 1.1 2008/09/16 11:45:30 tron Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/dkio.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <dev/ata/ata_raidvar.h>
struct ataraid_disk_vnode {
struct ataraid_disk_info *adv_adi;
struct vnode *adv_vnode;
SLIST_ENTRY(ataraid_disk_vnode) adv_next;
};
static SLIST_HEAD(, ataraid_disk_vnode) ataraid_disk_vnode_list =
SLIST_HEAD_INITIALIZER(ataraid_disk_vnode_list);
/*
* Finds the RAW_PART vnode of the block device associated with a component
* by looking at the singly linked list; otherwise creates, opens and
* returns the vnode to the caller.
*/
struct vnode *
ata_raid_disk_vnode_find(struct ataraid_disk_info *adi)
{
struct ataraid_disk_vnode *adv = NULL;
struct vnode *vp = NULL;
device_t devlist;
int bmajor, error = 0;
dev_t dev;
SLIST_FOREACH(adv, &ataraid_disk_vnode_list, adv_next) {
devlist = adv->adv_adi->adi_dev;
if (strcmp(device_xname(devlist),
device_xname(adi->adi_dev)) == 0)
return adv->adv_vnode;
}
adv = NULL;
adv = kmem_zalloc(sizeof(struct ataraid_disk_vnode), KM_SLEEP);
bmajor = devsw_name2blk(device_xname(adi->adi_dev), NULL, 0);
dev = MAKEDISKDEV(bmajor, device_unit(adi->adi_dev), RAW_PART);
error = bdevvp(dev, &vp);
if (error) {
kmem_free(adv, sizeof(struct ataraid_disk_vnode));
return NULL;
}
error = VOP_OPEN(vp, FREAD|FWRITE, NOCRED);
if (error) {
vput(vp);
kmem_free(adv, sizeof(struct ataraid_disk_vnode));
return NULL;
}
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
VOP_UNLOCK(vp, 0);
adv->adv_adi = adi;
adv->adv_vnode = vp;
SLIST_INSERT_HEAD(&ataraid_disk_vnode_list, adv, adv_next);
return adv->adv_vnode;
}