bio.c revision 1.13.16.4
1 /* $NetBSD: bio.c,v 1.13.16.4 2018/09/18 23:03:54 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 1.13.16.4 2018/09/18 23:03:54 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_HOOK_DECL(compat_bio_30_hook, f, 119 (void * cookie, u_long cmd, void *addr, int(*ff)(void *, u_long, void *)), 120 (cookie, cmd, addr, ff), enosys()); 121 MODULE_CALL_HOOK(compat_bio_30_hook, f, 122 (void * cookie, u_long cmd, void *addr, int(*ff)(void *, u_long, void *)), 123 (cookie, cmd, addr, ff), enosys()); 124 125 static int 126 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 127 { 128 struct bio_locate *locate; 129 struct bio_common *common; 130 char name[16]; 131 int error; 132 133 switch(cmd) { 134 case BIOCLOCATE: 135 case BIOCINQ: 136 case BIOCDISK: 137 case BIOCDISK_NOVOL: 138 case BIOCVOL: 139 case OBIOCDISK: 140 case OBIOCVOL: 141 error = kauth_authorize_device_passthru(l->l_cred, dev, 142 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 143 if (error) 144 return error; 145 break; 146 case BIOCBLINK: 147 case BIOCSETSTATE: 148 case BIOCVOLOPS: 149 error = kauth_authorize_device_passthru(l->l_cred, dev, 150 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 151 if (error) 152 return error; 153 break; 154 case BIOCALARM: { 155 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 156 switch (alarm->ba_opcode) { 157 case BIOC_SADISABLE: 158 case BIOC_SAENABLE: 159 case BIOC_SASILENCE: 160 case BIOC_SATEST: 161 error = kauth_authorize_device_passthru(l->l_cred, dev, 162 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 163 if (error) 164 return error; 165 break; 166 case BIOC_GASTATUS: 167 error = kauth_authorize_device_passthru(l->l_cred, dev, 168 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 169 if (error) 170 return error; 171 break; 172 default: 173 return EINVAL; 174 } 175 break; 176 } 177 default: 178 return ENOTTY; 179 } 180 181 switch (cmd) { 182 case BIOCLOCATE: 183 locate = addr; 184 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 185 if (error != 0) 186 return error; 187 locate->bl_cookie = bio_lookup(name); 188 if (locate->bl_cookie == NULL) 189 return ENOENT; 190 break; 191 192 default: 193 common = addr; 194 mutex_enter(&bio_lock); 195 if (!bio_validate(common->bc_cookie)) { 196 mutex_exit(&bio_lock); 197 return ENOENT; 198 } 199 mutex_exit(&bio_lock); 200 error = compat_bio_30_hook_f_call(common->bc_cookie, cmd, addr, 201 bio_delegate_ioctl); 202 if (error == ENOSYS) 203 error = bio_delegate_ioctl(common->bc_cookie, cmd, 204 addr); 205 return error; 206 } 207 return 0; 208 } 209 210 int 211 bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *)) 212 { 213 struct bio_mapping *bm; 214 215 if (!bio_lock_initialized) 216 bio_initialize(); 217 218 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 219 if (bm == NULL) 220 return ENOMEM; 221 bm->bm_dev = dev; 222 bm->bm_ioctl = ioctl; 223 mutex_enter(&bio_lock); 224 LIST_INSERT_HEAD(&bios, bm, bm_link); 225 mutex_exit(&bio_lock); 226 return 0; 227 } 228 229 void 230 bio_unregister(device_t dev) 231 { 232 struct bio_mapping *bm, *next; 233 234 mutex_enter(&bio_lock); 235 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 236 next = LIST_NEXT(bm, bm_link); 237 238 if (dev == bm->bm_dev) { 239 LIST_REMOVE(bm, bm_link); 240 free(bm, M_DEVBUF); 241 } 242 } 243 mutex_exit(&bio_lock); 244 } 245 246 static struct bio_mapping * 247 bio_lookup(char *name) 248 { 249 struct bio_mapping *bm; 250 251 mutex_enter(&bio_lock); 252 LIST_FOREACH(bm, &bios, bm_link) { 253 if (strcmp(name, device_xname(bm->bm_dev)) == 0) { 254 mutex_exit(&bio_lock); 255 return bm; 256 } 257 } 258 mutex_exit(&bio_lock); 259 return NULL; 260 } 261 262 static int 263 bio_validate(void *cookie) 264 { 265 struct bio_mapping *bm; 266 267 LIST_FOREACH(bm, &bios, bm_link) 268 if (bm == cookie) 269 return 1; 270 271 return 0; 272 } 273 274 static int 275 bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 276 { 277 struct bio_mapping *bm = cookie; 278 279 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 280 } 281 282 void 283 bio_disk_to_envsys(envsys_data_t *edata, const struct bioc_disk *bd) 284 { 285 switch (bd->bd_status) { 286 case BIOC_SDONLINE: 287 edata->value_cur = ENVSYS_DRIVE_ONLINE; 288 edata->state = ENVSYS_SVALID; 289 break; 290 case BIOC_SDOFFLINE: 291 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 292 edata->state = ENVSYS_SCRITICAL; 293 break; 294 default: 295 edata->value_cur = ENVSYS_DRIVE_FAIL; 296 edata->state = ENVSYS_SCRITICAL; 297 break; 298 } 299 } 300 301 void 302 bio_vol_to_envsys(envsys_data_t *edata, const struct bioc_vol *bv) 303 { 304 switch (bv->bv_status) { 305 case BIOC_SVOFFLINE: 306 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 307 edata->state = ENVSYS_SCRITICAL; 308 break; 309 case BIOC_SVDEGRADED: 310 edata->value_cur = ENVSYS_DRIVE_PFAIL; 311 edata->state = ENVSYS_SCRITICAL; 312 break; 313 case BIOC_SVBUILDING: 314 edata->value_cur = ENVSYS_DRIVE_BUILD; 315 edata->state = ENVSYS_SVALID; 316 break; 317 case BIOC_SVMIGRATING: 318 edata->value_cur = ENVSYS_DRIVE_MIGRATING; 319 edata->state = ENVSYS_SVALID; 320 break; 321 case BIOC_SVCHECKING: 322 edata->value_cur = ENVSYS_DRIVE_CHECK; 323 edata->state = ENVSYS_SVALID; 324 break; 325 case BIOC_SVREBUILD: 326 edata->value_cur = ENVSYS_DRIVE_REBUILD; 327 edata->state = ENVSYS_SCRITICAL; 328 break; 329 case BIOC_SVSCRUB: 330 case BIOC_SVONLINE: 331 edata->value_cur = ENVSYS_DRIVE_ONLINE; 332 edata->state = ENVSYS_SVALID; 333 break; 334 case BIOC_SVINVALID: 335 /* FALLTHROUGH */ 336 default: 337 edata->value_cur = ENVSYS_DRIVE_EMPTY; /* unknown state */ 338 edata->state = ENVSYS_SINVALID; 339 break; 340 } 341 } 342
Indexes created Mon Oct 13 05:10:05 GMT 2025