1 /* $OpenBSD: bio.c,v 1.2 2003/06/03 20:49:28 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2002 Niklas Hallqvist. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 /* A device controller ioctl tunnelling device. */ 28 29 #include <sys/param.h> 30 #include <sys/device.h> 31 #include <sys/ioctl.h> 32 #include <sys/malloc.h> 33 #include <sys/queue.h> 34 #include <sys/systm.h> 35 36 #include <dev/biovar.h> 37 38 struct bio_mapping { 39 LIST_ENTRY(bio_mapping) bm_link; 40 struct device *bm_dev; 41 int (*bm_ioctl)(struct device *, u_long, caddr_t); 42 }; 43 44 LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios); 45 46 struct bio_softc { 47 struct device sc_dev; 48 }; 49 50 void bioattach(int); 51 int bioclose(dev_t, int, int, struct proc *); 52 int bioioctl(dev_t, u_long, caddr_t, int, struct proc *); 53 int bioopen(dev_t, int, int, struct proc *);; 54 55 int bio_delegate_ioctl(struct bio_mapping *, u_long, caddr_t); 56 struct bio_mapping *bio_lookup(char *); 57 int bio_validate(void *); 58 59 void 60 bioattach(nunits) 61 int nunits; 62 { 63 } 64 65 int 66 bioopen(dev, flags, mode, p) 67 dev_t dev; 68 int flags, mode; 69 struct proc *p; 70 { 71 return (0); 72 } 73 74 int 75 bioclose(dev, flags, mode, p) 76 dev_t dev; 77 int flags, mode; 78 struct proc *p; 79 { 80 return (0); 81 } 82 83 int 84 bioioctl(dev, cmd, addr, flag, p) 85 dev_t dev; 86 u_long cmd; 87 caddr_t addr; 88 int flag; 89 struct proc *p; 90 { 91 char name[16]; 92 int len, error; 93 struct bio_locate *locate; 94 struct bio_common *common; 95 96 switch (cmd) { 97 case BIOCLOCATE: 98 locate = (struct bio_locate *)addr; 99 error = copyinstr(locate->name, name, 16, &len); 100 if (error != 0) 101 return (error); 102 locate->cookie = bio_lookup(name); 103 if (locate->cookie == NULL) 104 return (ENOENT); 105 break; 106 107 default: 108 common = (struct bio_common *)addr; 109 if (!bio_validate(common->cookie)) 110 return (ENOENT); 111 return (bio_delegate_ioctl( 112 (struct bio_mapping *)common->cookie, cmd, addr)); 113 } 114 return (0); 115 } 116 117 int 118 bio_register(dev, ioctl) 119 struct device *dev; 120 int (*ioctl)(struct device *, u_long, caddr_t); 121 { 122 struct bio_mapping *bm; 123 124 MALLOC(bm, struct bio_mapping *, sizeof *bm, M_DEVBUF, M_NOWAIT); 125 if (bm == NULL) 126 return (ENOMEM); 127 bm->bm_dev = dev; 128 bm->bm_ioctl = ioctl; 129 LIST_INSERT_HEAD(&bios, bm, bm_link); 130 return (0); 131 } 132 133 struct bio_mapping * 134 bio_lookup(name) 135 char *name; 136 { 137 struct bio_mapping *bm; 138 139 for (bm = LIST_FIRST(&bios); bm != NULL; bm = LIST_NEXT(bm, bm_link)) 140 if (strcmp(name, bm->bm_dev->dv_xname) == 0) 141 return (bm); 142 return (NULL); 143 } 144 145 int 146 bio_validate(cookie) 147 void *cookie; 148 { 149 struct bio_mapping *bm; 150 151 for (bm = LIST_FIRST(&bios); bm != NULL; bm = LIST_NEXT(bm, bm_link)) 152 if (bm == cookie) 153 return (1); 154 return (0); 155 } 156 157 int 158 bio_delegate_ioctl(bm, cmd, addr) 159 struct bio_mapping *bm; 160 u_long cmd; 161 caddr_t addr; 162 { 163 return (bm->bm_ioctl(bm->bm_dev, cmd, addr)); 164 } 165