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 | |