FreeBSD/Linux Kernel Cross Reference
sys/dev/bio.c
1 /* $OpenBSD: bio.c,v 1.17 2015/08/26 22:28:57 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 2002 Niklas Hallqvist. All rights reserved.
5 * Copyright (c) 2012 Joel Sing <jsing@openbsd.org>. 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 /* A device controller ioctl tunnelling device. */
29
30 #include <sys/param.h>
31 #include <sys/device.h>
32 #include <sys/ioctl.h>
33 #include <sys/malloc.h>
34 #include <sys/queue.h>
35 #include <sys/systm.h>
36
37 #include <dev/biovar.h>
38
39 struct bio_mapping {
40 LIST_ENTRY(bio_mapping) bm_link;
41 struct device *bm_dev;
42 int (*bm_ioctl)(struct device *, u_long, caddr_t);
43 };
44
45 LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios);
46
47 void bioattach(int);
48 int bioclose(dev_t, int, int, struct proc *);
49 int bioioctl(dev_t, u_long, caddr_t, int, struct proc *);
50 int bioopen(dev_t, int, int, struct proc *);
51
52 int bio_delegate_ioctl(struct bio_mapping *, u_long, caddr_t);
53 struct bio_mapping *bio_lookup(char *);
54 int bio_validate(void *);
55
56 void
57 bioattach(int nunits)
58 {
59 }
60
61 int
62 bioopen(dev_t dev, int flags, int mode, struct proc *p)
63 {
64 return (0);
65 }
66
67 int
68 bioclose(dev_t dev, int flags, int mode, struct proc *p)
69 {
70 return (0);
71 }
72
73 int
74 bioioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
75 {
76 struct bio_locate *locate;
77 struct bio *bio;
78 char name[16];
79 int error;
80
81 switch (cmd) {
82 case BIOCLOCATE:
83 locate = (struct bio_locate *)addr;
84 error = copyinstr(locate->bl_name, name, sizeof name, NULL);
85 if (error != 0)
86 return (error);
87 locate->bl_bio.bio_cookie = bio_lookup(name);
88 if (locate->bl_bio.bio_cookie == NULL)
89 return (ENOENT);
90 break;
91
92 case BIOCINQ:
93 case BIOCDISK:
94 case BIOCVOL:
95 case BIOCALARM:
96 case BIOCBLINK:
97 case BIOCSETSTATE:
98 case BIOCCREATERAID:
99 case BIOCDELETERAID:
100 case BIOCDISCIPLINE:
101 case BIOCPATROL:
102 bio = (struct bio *)addr;
103 if (!bio_validate(bio->bio_cookie))
104 return (ENOENT);
105 return (bio_delegate_ioctl(
106 (struct bio_mapping *)bio->bio_cookie, cmd, addr));
107
108 default:
109 return (ENXIO);
110 }
111 return (0);
112 }
113
114 int
115 bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, caddr_t))
116 {
117 struct bio_mapping *bm;
118
119 bm = malloc(sizeof *bm, M_DEVBUF, M_NOWAIT);
120 if (bm == NULL)
121 return (ENOMEM);
122 bm->bm_dev = dev;
123 bm->bm_ioctl = ioctl;
124 LIST_INSERT_HEAD(&bios, bm, bm_link);
125 return (0);
126 }
127
128 void
129 bio_unregister(struct device *dev)
130 {
131 struct bio_mapping *bm, *next;
132
133 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) {
134 next = LIST_NEXT(bm, bm_link);
135
136 if (dev == bm->bm_dev) {
137 LIST_REMOVE(bm, bm_link);
138 free(bm, M_DEVBUF, sizeof(*bm));
139 }
140 }
141 }
142
143 struct bio_mapping *
144 bio_lookup(char *name)
145 {
146 struct bio_mapping *bm;
147
148 LIST_FOREACH(bm, &bios, bm_link)
149 if (strcmp(name, bm->bm_dev->dv_xname) == 0)
150 return (bm);
151 return (NULL);
152 }
153
154 int
155 bio_validate(void *cookie)
156 {
157 struct bio_mapping *bm;
158
159 LIST_FOREACH(bm, &bios, bm_link)
160 if (bm == cookie)
161 return (1);
162 return (0);
163 }
164
165 int
166 bio_delegate_ioctl(struct bio_mapping *bm, u_long cmd, caddr_t addr)
167 {
168 return (bm->bm_ioctl(bm->bm_dev, cmd, addr));
169 }
170
171 void
172 bio_info(struct bio_status *bs, int print, const char *fmt, ...)
173 {
174 va_list ap;
175
176 va_start(ap, fmt);
177 bio_status(bs, print, BIO_MSG_INFO, fmt, &ap);
178 va_end(ap);
179 }
180
181 void
182 bio_warn(struct bio_status *bs, int print, const char *fmt, ...)
183 {
184 va_list ap;
185
186 va_start(ap, fmt);
187 bio_status(bs, print, BIO_MSG_WARN, fmt, &ap);
188 va_end(ap);
189 }
190
191 void
192 bio_error(struct bio_status *bs, int print, const char *fmt, ...)
193 {
194 va_list ap;
195
196 va_start(ap, fmt);
197 bio_status(bs, print, BIO_MSG_ERROR, fmt, &ap);
198 va_end(ap);
199 }
200
201 void
202 bio_status_init(struct bio_status *bs, struct device *dv)
203 {
204 bzero(bs, sizeof(struct bio_status));
205
206 bs->bs_status = BIO_STATUS_UNKNOWN;
207
208 strlcpy(bs->bs_controller, dv->dv_xname, sizeof(bs->bs_controller));
209 }
210
211 void
212 bio_status(struct bio_status *bs, int print, int msg_type, const char *fmt,
213 va_list *ap)
214 {
215 int idx;
216
217 if (bs->bs_msg_count >= BIO_MSG_COUNT) {
218 printf("%s: insufficient message buffers\n", bs->bs_controller);
219 return;
220 }
221
222 idx = bs->bs_msg_count++;
223
224 bs->bs_msgs[idx].bm_type = msg_type;
225 vsnprintf(bs->bs_msgs[idx].bm_msg, BIO_MSG_LEN, fmt, *ap);
226
227 if (print)
228 printf("%s: %s\n", bs->bs_controller, bs->bs_msgs[idx].bm_msg);
229 }
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