| 1 | /* $NetBSD: ata_raid_subr.c,v 1.2 2010/06/24 13:03:08 hannken 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 1.2 2010/06/24 13:03:08 hannken 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 = NULL; |
| 76 | adv = kmem_zalloc(sizeof(struct ataraid_disk_vnode), KM_SLEEP); |
| 77 | |
| 78 | bmajor = devsw_name2blk(device_xname(adi->adi_dev), NULL, 0); |
| 79 | dev = MAKEDISKDEV(bmajor, device_unit(adi->adi_dev), RAW_PART); |
| 80 | |
| 81 | error = bdevvp(dev, &vp); |
| 82 | if (error) { |
| 83 | kmem_free(adv, sizeof(struct ataraid_disk_vnode)); |
| 84 | return NULL; |
| 85 | } |
| 86 | error = VOP_OPEN(vp, FREAD|FWRITE, NOCRED); |
| 87 | if (error) { |
| 88 | vput(vp); |
| 89 | kmem_free(adv, sizeof(struct ataraid_disk_vnode)); |
| 90 | return NULL; |
| 91 | } |
| 92 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 93 | VOP_UNLOCK(vp); |
| 94 | |
| 95 | adv->adv_adi = adi; |
| 96 | adv->adv_vnode = vp; |
| 97 | |
| 98 | SLIST_INSERT_HEAD(&ataraid_disk_vnode_list, adv, adv_next); |
| 99 | |
| 100 | return adv->adv_vnode; |
| 101 | } |
| 102 | |