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      1 /* $NetBSD: ata_raid_subr.c,v 1.5 2025/03/16 12:27:50 andvar Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2008 Juan Romero Pardines.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: ata_raid_subr.c,v 1.5 2025/03/16 12:27:50 andvar Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/systm.h>
     33 #include <sys/conf.h>
     34 #include <sys/kernel.h>
     35 #include <sys/dkio.h>
     36 #include <sys/disk.h>
     37 #include <sys/disklabel.h>
     38 #include <sys/fcntl.h>
     39 #include <sys/vnode.h>
     40 #include <sys/kauth.h>
     41 #include <sys/kmem.h>
     42 
     43 #include <dev/ata/ata_raidvar.h>
     44 
     45 struct ataraid_disk_vnode {
     46 	struct ataraid_disk_info *adv_adi;
     47 	struct vnode *adv_vnode;
     48 	SLIST_ENTRY(ataraid_disk_vnode) adv_next;
     49 };
     50 
     51 static SLIST_HEAD(, ataraid_disk_vnode) ataraid_disk_vnode_list =
     52     SLIST_HEAD_INITIALIZER(ataraid_disk_vnode_list);
     53 
     54 /*
     55  * Finds the RAW_PART vnode of the block device associated with a component
     56  * by looking at the singly linked list; otherwise creates, opens and
     57  * returns the vnode to the caller.
     58  */
     59 struct vnode *
     60 ata_raid_disk_vnode_find(struct ataraid_disk_info *adi)
     61 {
     62 	struct ataraid_disk_vnode *adv = NULL;
     63 	struct vnode *vp = NULL;
     64 	device_t devlist;
     65 	int bmajor, error = 0;
     66 	dev_t dev;
     67 
     68 	SLIST_FOREACH(adv, &ataraid_disk_vnode_list, adv_next) {
     69 		devlist = adv->adv_adi->adi_dev;
     70 		if (strcmp(device_xname(devlist),
     71 		    device_xname(adi->adi_dev)) == 0)
     72 			return adv->adv_vnode;
     73 	}
     74 
     75 	adv = kmem_zalloc(sizeof(struct ataraid_disk_vnode), KM_SLEEP);
     76 
     77 	bmajor = devsw_name2blk(device_xname(adi->adi_dev), NULL, 0);
     78 	dev = MAKEDISKDEV(bmajor, device_unit(adi->adi_dev), RAW_PART);
     79 
     80 	error = vn_bdev_open(dev, &vp, curlwp);
     81 	if (error) {
     82 		kmem_free(adv, sizeof(struct ataraid_disk_vnode));
     83 		return NULL;
     84 	}
     85 
     86 	adv->adv_adi = adi;
     87 	adv->adv_vnode = vp;
     88 
     89 	SLIST_INSERT_HEAD(&ataraid_disk_vnode_list, adv, adv_next);
     90 
     91 	return adv->adv_vnode;
     92 }
     93