101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/* $NetBSD: ata_raid_subr.c,v 1.3 2017/06/25 12:29:32 maxv Exp $ */
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/*-
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* Copyright (c) 2008 Juan Romero Pardines.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ata_raid_subr.c,v 1.3 2017/06/25 12:29:32 maxv Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/dkio.h>
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#include <sys/disk.h>
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#include <sys/disklabel.h>
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#include <sys/fcntl.h>
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#include <sys/vnode.h>
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#include <sys/kauth.h>
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#include <sys/kmem.h>
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#include <dev/ata/ata_raidvar.h>
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struct ataraid_disk_vnode {
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struct ataraid_disk_info *adv_adi;
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struct vnode *adv_vnode;
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SLIST_ENTRY(ataraid_disk_vnode) adv_next;
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};
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static SLIST_HEAD(, ataraid_disk_vnode) ataraid_disk_vnode_list =
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SLIST_HEAD_INITIALIZER(ataraid_disk_vnode_list);
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/*
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* Finds the RAW_PART vnode of the block device associated with a component
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* by looking at the singly linked list; otherwise creates, opens and
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* returns the vnode to the caller.
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*/
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struct vnode *
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ata_raid_disk_vnode_find(struct ataraid_disk_info *adi)
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{
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struct ataraid_disk_vnode *adv = NULL;
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struct vnode *vp = NULL;
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device_t devlist;
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int bmajor, error = 0;
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dev_t dev;
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SLIST_FOREACH(adv, &ataraid_disk_vnode_list, adv_next) {
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devlist = adv->adv_adi->adi_dev;
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if (strcmp(device_xname(devlist),
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device_xname(adi->adi_dev)) == 0)
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return adv->adv_vnode;
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}
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adv = kmem_zalloc(sizeof(struct ataraid_disk_vnode), KM_SLEEP);
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bmajor = devsw_name2blk(device_xname(adi->adi_dev), NULL, 0);
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dev = MAKEDISKDEV(bmajor, device_unit(adi->adi_dev), RAW_PART);
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error = bdevvp(dev, &vp);
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if (error) {
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kmem_free(adv, sizeof(struct ataraid_disk_vnode));
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return NULL;
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}
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error = VOP_OPEN(vp, FREAD|FWRITE, NOCRED);
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if (error) {
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vput(vp);
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kmem_free(adv, sizeof(struct ataraid_disk_vnode));
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return NULL;
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}
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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VOP_UNLOCK(vp);
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adv->adv_adi = adi;
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adv->adv_vnode = vp;
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SLIST_INSERT_HEAD(&ataraid_disk_vnode_list, adv, adv_next);
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return adv->adv_vnode;
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}
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