bio.c revision 1.6.6.3
1 /* $NetBSD: bio.c,v 1.6.6.3 2008/06/02 13:23:11 mjf Exp $ */ 2 /* $OpenBSD: bio.c,v 1.9 2007/03/20 02:35:55 marco Exp $ */ 3 4 /* 5 * Copyright (c) 2002 Niklas Hallqvist. 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/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: bio.c,v 1.6.6.3 2008/06/02 13:23:11 mjf Exp $"); 32 33 #include "opt_compat_netbsd.h" 34 35 #include <sys/param.h> 36 #include <sys/conf.h> 37 #include <sys/device.h> 38 #include <sys/event.h> 39 #include <sys/ioctl.h> 40 #include <sys/malloc.h> 41 #include <sys/queue.h> 42 #include <sys/systm.h> 43 #include <sys/mutex.h> 44 #include <sys/proc.h> 45 #include <sys/kauth.h> 46 47 #include <dev/biovar.h> 48 49 struct bio_mapping { 50 LIST_ENTRY(bio_mapping) bm_link; 51 struct device *bm_dev; 52 int (*bm_ioctl)(struct device *, u_long, void *); 53 }; 54 55 static LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios); 56 static kmutex_t bio_lock; 57 static bool bio_lock_initialized = false; 58 59 static void bio_initialize(void); 60 static int bioclose(dev_t, int, int, struct lwp *); 61 static int bioioctl(dev_t, u_long, void *, int, struct lwp *); 62 static int bioopen(dev_t, int, int, struct lwp *); 63 64 static int bio_delegate_ioctl(void *, u_long, void *); 65 static struct bio_mapping *bio_lookup(char *); 66 static int bio_validate(void *); 67 68 void bioattach(int); 69 70 const struct cdevsw bio_cdevsw = { 71 bioopen, bioclose, noread, nowrite, bioioctl, 72 nostop, notty, nopoll, nommap, nokqfilter, D_OTHER | D_MPSAFE 73 }; 74 75 76 static void 77 bio_initialize(void) 78 { 79 if (bio_lock_initialized) 80 return; 81 82 mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM); 83 bio_lock_initialized = true; 84 } 85 86 void 87 bioattach(int nunits) 88 { 89 int maj; 90 91 if (!bio_lock_initialized) 92 bio_initialize(); 93 94 maj = cdevsw_lookup_major(&bio_cdevsw); 95 device_register_name(makedev(maj, 0), NULL, true, DEV_DISK, "bio"); 96 } 97 98 static int 99 bioopen(dev_t dev, int flags, int mode, struct lwp *l) 100 { 101 return 0; 102 } 103 104 static int 105 bioclose(dev_t dev, int flags, int mode, struct lwp *l) 106 { 107 return 0; 108 } 109 110 static int 111 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 112 { 113 struct bio_locate *locate; 114 struct bio_common *common; 115 char name[16]; 116 int error; 117 118 switch(cmd) { 119 case BIOCLOCATE: 120 case BIOCINQ: 121 case BIOCDISK: 122 case BIOCDISK_NOVOL: 123 case BIOCVOL: 124 #ifdef COMPAT_30 125 case OBIOCDISK: 126 case OBIOCVOL: 127 #endif 128 error = kauth_authorize_device_passthru(l->l_cred, dev, 129 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 130 if (error) 131 return error; 132 break; 133 case BIOCBLINK: 134 case BIOCSETSTATE: 135 case BIOCVOLOPS: 136 error = kauth_authorize_device_passthru(l->l_cred, dev, 137 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 138 if (error) 139 return error; 140 break; 141 case BIOCALARM: { 142 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 143 switch (alarm->ba_opcode) { 144 case BIOC_SADISABLE: 145 case BIOC_SAENABLE: 146 case BIOC_SASILENCE: 147 case BIOC_SATEST: 148 error = kauth_authorize_device_passthru(l->l_cred, dev, 149 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 150 if (error) 151 return error; 152 break; 153 case BIOC_GASTATUS: 154 error = kauth_authorize_device_passthru(l->l_cred, dev, 155 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 156 if (error) 157 return error; 158 break; 159 default: 160 return EINVAL; 161 } 162 break; 163 } 164 default: 165 return ENOTTY; 166 } 167 168 switch (cmd) { 169 case BIOCLOCATE: 170 locate = addr; 171 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 172 if (error != 0) 173 return error; 174 locate->bl_cookie = bio_lookup(name); 175 if (locate->bl_cookie == NULL) 176 return ENOENT; 177 break; 178 179 default: 180 common = addr; 181 mutex_enter(&bio_lock); 182 if (!bio_validate(common->bc_cookie)) { 183 mutex_exit(&bio_lock); 184 return ENOENT; 185 } 186 mutex_exit(&bio_lock); 187 #ifdef COMPAT_30 188 switch (cmd) { 189 case OBIOCDISK: { 190 struct bioc_disk *bd = 191 malloc(sizeof(*bd), M_DEVBUF, M_WAITOK|M_ZERO); 192 193 (void)memcpy(bd, addr, sizeof(struct obioc_disk)); 194 error = bio_delegate_ioctl(common->bc_cookie, 195 BIOCDISK, bd); 196 if (error) { 197 free(bd, M_DEVBUF); 198 return error; 199 } 200 201 (void)memcpy(addr, bd, sizeof(struct obioc_disk)); 202 free(bd, M_DEVBUF); 203 return 0; 204 } 205 case OBIOCVOL: { 206 struct bioc_vol *bv = 207 malloc(sizeof(*bv), M_DEVBUF, M_WAITOK|M_ZERO); 208 209 (void)memcpy(bv, addr, sizeof(struct obioc_vol)); 210 error = bio_delegate_ioctl(common->bc_cookie, 211 BIOCVOL, bv); 212 if (error) { 213 free(bv, M_DEVBUF); 214 return error; 215 } 216 217 (void)memcpy(addr, bv, sizeof(struct obioc_vol)); 218 free(bv, M_DEVBUF); 219 return 0; 220 } 221 } 222 #endif 223 error = bio_delegate_ioctl(common->bc_cookie, cmd, addr); 224 return error; 225 } 226 return 0; 227 } 228 229 int 230 bio_register(struct device *dev, int (*ioctl)(struct device *, u_long, void *)) 231 { 232 struct bio_mapping *bm; 233 234 if (!bio_lock_initialized) 235 bio_initialize(); 236 237 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 238 if (bm == NULL) 239 return ENOMEM; 240 bm->bm_dev = dev; 241 bm->bm_ioctl = ioctl; 242 mutex_enter(&bio_lock); 243 LIST_INSERT_HEAD(&bios, bm, bm_link); 244 mutex_exit(&bio_lock); 245 return 0; 246 } 247 248 void 249 bio_unregister(struct device *dev) 250 { 251 struct bio_mapping *bm, *next; 252 253 mutex_enter(&bio_lock); 254 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 255 next = LIST_NEXT(bm, bm_link); 256 257 if (dev == bm->bm_dev) { 258 LIST_REMOVE(bm, bm_link); 259 free(bm, M_DEVBUF); 260 } 261 } 262 mutex_exit(&bio_lock); 263 } 264 265 static struct bio_mapping * 266 bio_lookup(char *name) 267 { 268 struct bio_mapping *bm; 269 270 mutex_enter(&bio_lock); 271 LIST_FOREACH(bm, &bios, bm_link) { 272 if (strcmp(name, device_xname(bm->bm_dev)) == 0) { 273 mutex_exit(&bio_lock); 274 return bm; 275 } 276 } 277 mutex_exit(&bio_lock); 278 return NULL; 279 } 280 281 static int 282 bio_validate(void *cookie) 283 { 284 struct bio_mapping *bm; 285 286 LIST_FOREACH(bm, &bios, bm_link) 287 if (bm == cookie) 288 return 1; 289 290 return 0; 291 } 292 293 static int 294 bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 295 { 296 struct bio_mapping *bm = cookie; 297 298 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 299 } 300
Indexes created Sun Oct 12 22:09:51 GMT 2025