bio.c revision 1.13.16.7
1 /* $NetBSD: bio.c,v 1.13.16.7 2019/01/14 13:34:27 pgoyette 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 1.13.16.7 2019/01/14 13:34:27 pgoyette 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 #include <sys/compat_stub.h> 47 48 #include <dev/biovar.h> 49 #include <dev/sysmon/sysmonvar.h> 50 51 #include "ioconf.h" 52 53 struct bio_mapping { 54 LIST_ENTRY(bio_mapping) bm_link; 55 device_t bm_dev; 56 int (*bm_ioctl)(device_t, u_long, void *); 57 }; 58 59 static LIST_HEAD(, bio_mapping) bios = LIST_HEAD_INITIALIZER(bios); 60 static kmutex_t bio_lock; 61 static bool bio_lock_initialized = false; 62 63 static void bio_initialize(void); 64 static int bioclose(dev_t, int, int, struct lwp *); 65 static int bioioctl(dev_t, u_long, void *, int, struct lwp *); 66 static int bioopen(dev_t, int, int, struct lwp *); 67 68 static int bio_delegate_ioctl(void *, u_long, void *); 69 static struct bio_mapping *bio_lookup(char *); 70 static int bio_validate(void *); 71 72 const struct cdevsw bio_cdevsw = { 73 .d_open = bioopen, 74 .d_close = bioclose, 75 .d_read = noread, 76 .d_write = nowrite, 77 .d_ioctl = bioioctl, 78 .d_stop = nostop, 79 .d_tty = notty, 80 .d_poll = nopoll, 81 .d_mmap = nommap, 82 .d_kqfilter = nokqfilter, 83 .d_discard = nodiscard, 84 .d_flag = D_OTHER | D_MPSAFE 85 }; 86 87 88 static void 89 bio_initialize(void) 90 { 91 if (bio_lock_initialized) 92 return; 93 94 mutex_init(&bio_lock, MUTEX_DEFAULT, IPL_VM); 95 bio_lock_initialized = true; 96 } 97 98 void 99 bioattach(int nunits) 100 { 101 if (!bio_lock_initialized) 102 bio_initialize(); 103 } 104 105 static int 106 bioopen(dev_t dev, int flags, int mode, struct lwp *l) 107 { 108 return 0; 109 } 110 111 static int 112 bioclose(dev_t dev, int flags, int mode, struct lwp *l) 113 { 114 return 0; 115 } 116 117 /* Hook up the compat_bio_30 routine */ 118 MODULE_CALL_INT_HOOK_DECL(compat_bio_30_hook, 119 (void * cookie, u_long cmd, void *addr, int(*ff)(void *, u_long, void *))); 120 MODULE_CALL_INT_HOOK(compat_bio_30_hook, 121 (void * cookie, u_long cmd, void *addr, int(*ff)(void *, u_long, void *)), 122 (cookie, cmd, addr, ff), enosys()); 123 124 static int 125 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 126 { 127 struct bio_locate *locate; 128 struct bio_common *common; 129 char name[16]; 130 int error; 131 132 switch(cmd) { 133 case BIOCLOCATE: 134 case BIOCINQ: 135 case BIOCDISK: 136 case BIOCDISK_NOVOL: 137 case BIOCVOL: 138 case OBIOCDISK: 139 case OBIOCVOL: 140 error = kauth_authorize_device_passthru(l->l_cred, dev, 141 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 142 if (error) 143 return error; 144 break; 145 case BIOCBLINK: 146 case BIOCSETSTATE: 147 case BIOCVOLOPS: 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 BIOCALARM: { 154 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 155 switch (alarm->ba_opcode) { 156 case BIOC_SADISABLE: 157 case BIOC_SAENABLE: 158 case BIOC_SASILENCE: 159 case BIOC_SATEST: 160 error = kauth_authorize_device_passthru(l->l_cred, dev, 161 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 162 if (error) 163 return error; 164 break; 165 case BIOC_GASTATUS: 166 error = kauth_authorize_device_passthru(l->l_cred, dev, 167 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 168 if (error) 169 return error; 170 break; 171 default: 172 return EINVAL; 173 } 174 break; 175 } 176 default: 177 return ENOTTY; 178 } 179 180 switch (cmd) { 181 case BIOCLOCATE: 182 locate = addr; 183 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 184 if (error != 0) 185 return error; 186 locate->bl_cookie = bio_lookup(name); 187 if (locate->bl_cookie == NULL) 188 return ENOENT; 189 break; 190 191 default: 192 common = addr; 193 mutex_enter(&bio_lock); 194 if (!bio_validate(common->bc_cookie)) { 195 mutex_exit(&bio_lock); 196 return ENOENT; 197 } 198 mutex_exit(&bio_lock); 199 error = compat_bio_30_hook_call(common->bc_cookie, cmd, addr, 200 bio_delegate_ioctl); 201 if (error == ENOSYS) 202 error = bio_delegate_ioctl(common->bc_cookie, cmd, 203 addr); 204 return error; 205 } 206 return 0; 207 } 208 209 int 210 bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *)) 211 { 212 struct bio_mapping *bm; 213 214 if (!bio_lock_initialized) 215 bio_initialize(); 216 217 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 218 if (bm == NULL) 219 return ENOMEM; 220 bm->bm_dev = dev; 221 bm->bm_ioctl = ioctl; 222 mutex_enter(&bio_lock); 223 LIST_INSERT_HEAD(&bios, bm, bm_link); 224 mutex_exit(&bio_lock); 225 return 0; 226 } 227 228 void 229 bio_unregister(device_t dev) 230 { 231 struct bio_mapping *bm, *next; 232 233 mutex_enter(&bio_lock); 234 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 235 next = LIST_NEXT(bm, bm_link); 236 237 if (dev == bm->bm_dev) { 238 LIST_REMOVE(bm, bm_link); 239 free(bm, M_DEVBUF); 240 } 241 } 242 mutex_exit(&bio_lock); 243 } 244 245 static struct bio_mapping * 246 bio_lookup(char *name) 247 { 248 struct bio_mapping *bm; 249 250 mutex_enter(&bio_lock); 251 LIST_FOREACH(bm, &bios, bm_link) { 252 if (strcmp(name, device_xname(bm->bm_dev)) == 0) { 253 mutex_exit(&bio_lock); 254 return bm; 255 } 256 } 257 mutex_exit(&bio_lock); 258 return NULL; 259 } 260 261 static int 262 bio_validate(void *cookie) 263 { 264 struct bio_mapping *bm; 265 266 LIST_FOREACH(bm, &bios, bm_link) 267 if (bm == cookie) 268 return 1; 269 270 return 0; 271 } 272 273 static int 274 bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 275 { 276 struct bio_mapping *bm = cookie; 277 278 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 279 } 280 281 void 282 bio_disk_to_envsys(envsys_data_t *edata, const struct bioc_disk *bd) 283 { 284 switch (bd->bd_status) { 285 case BIOC_SDONLINE: 286 edata->value_cur = ENVSYS_DRIVE_ONLINE; 287 edata->state = ENVSYS_SVALID; 288 break; 289 case BIOC_SDOFFLINE: 290 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 291 edata->state = ENVSYS_SCRITICAL; 292 break; 293 default: 294 edata->value_cur = ENVSYS_DRIVE_FAIL; 295 edata->state = ENVSYS_SCRITICAL; 296 break; 297 } 298 } 299 300 void 301 bio_vol_to_envsys(envsys_data_t *edata, const struct bioc_vol *bv) 302 { 303 switch (bv->bv_status) { 304 case BIOC_SVOFFLINE: 305 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 306 edata->state = ENVSYS_SCRITICAL; 307 break; 308 case BIOC_SVDEGRADED: 309 edata->value_cur = ENVSYS_DRIVE_PFAIL; 310 edata->state = ENVSYS_SCRITICAL; 311 break; 312 case BIOC_SVBUILDING: 313 edata->value_cur = ENVSYS_DRIVE_BUILD; 314 edata->state = ENVSYS_SVALID; 315 break; 316 case BIOC_SVMIGRATING: 317 edata->value_cur = ENVSYS_DRIVE_MIGRATING; 318 edata->state = ENVSYS_SVALID; 319 break; 320 case BIOC_SVCHECKING: 321 edata->value_cur = ENVSYS_DRIVE_CHECK; 322 edata->state = ENVSYS_SVALID; 323 break; 324 case BIOC_SVREBUILD: 325 edata->value_cur = ENVSYS_DRIVE_REBUILD; 326 edata->state = ENVSYS_SCRITICAL; 327 break; 328 case BIOC_SVSCRUB: 329 case BIOC_SVONLINE: 330 edata->value_cur = ENVSYS_DRIVE_ONLINE; 331 edata->state = ENVSYS_SVALID; 332 break; 333 case BIOC_SVINVALID: 334 /* FALLTHROUGH */ 335 default: 336 edata->value_cur = ENVSYS_DRIVE_EMPTY; /* unknown state */ 337 edata->state = ENVSYS_SINVALID; 338 break; 339 } 340 } 341
Indexes created Sun Oct 12 22:09:51 GMT 2025