bio.c revision 1.13.16.2
1 /* $NetBSD: bio.c,v 1.13.16.2 2018/09/17 11:04:30 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 1.13.16.2 2018/09/17 11:04:30 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 COMPAT_CALL_HOOK(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()); 121 122 static int 123 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 124 { 125 struct bio_locate *locate; 126 struct bio_common *common; 127 char name[16]; 128 int error; 129 130 switch(cmd) { 131 case BIOCLOCATE: 132 case BIOCINQ: 133 case BIOCDISK: 134 case BIOCDISK_NOVOL: 135 case BIOCVOL: 136 case OBIOCDISK: 137 case OBIOCVOL: 138 error = kauth_authorize_device_passthru(l->l_cred, dev, 139 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 140 if (error) 141 return error; 142 break; 143 case BIOCBLINK: 144 case BIOCSETSTATE: 145 case BIOCVOLOPS: 146 error = kauth_authorize_device_passthru(l->l_cred, dev, 147 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 148 if (error) 149 return error; 150 break; 151 case BIOCALARM: { 152 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 153 switch (alarm->ba_opcode) { 154 case BIOC_SADISABLE: 155 case BIOC_SAENABLE: 156 case BIOC_SASILENCE: 157 case BIOC_SATEST: 158 error = kauth_authorize_device_passthru(l->l_cred, dev, 159 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 160 if (error) 161 return error; 162 break; 163 case BIOC_GASTATUS: 164 error = kauth_authorize_device_passthru(l->l_cred, dev, 165 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 166 if (error) 167 return error; 168 break; 169 default: 170 return EINVAL; 171 } 172 break; 173 } 174 default: 175 return ENOTTY; 176 } 177 178 switch (cmd) { 179 case BIOCLOCATE: 180 locate = addr; 181 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 182 if (error != 0) 183 return error; 184 locate->bl_cookie = bio_lookup(name); 185 if (locate->bl_cookie == NULL) 186 return ENOENT; 187 break; 188 189 default: 190 common = addr; 191 mutex_enter(&bio_lock); 192 if (!bio_validate(common->bc_cookie)) { 193 mutex_exit(&bio_lock); 194 return ENOENT; 195 } 196 mutex_exit(&bio_lock); 197 error = compat_bio_30_hook_f_call(common->bc_cookie, cmd, addr, 198 bio_delegate_ioctl); 199 if (error == ENOSYS) 200 error = bio_delegate_ioctl(common->bc_cookie, cmd, 201 addr); 202 return error; 203 } 204 return 0; 205 } 206 207 int 208 bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *)) 209 { 210 struct bio_mapping *bm; 211 212 if (!bio_lock_initialized) 213 bio_initialize(); 214 215 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 216 if (bm == NULL) 217 return ENOMEM; 218 bm->bm_dev = dev; 219 bm->bm_ioctl = ioctl; 220 mutex_enter(&bio_lock); 221 LIST_INSERT_HEAD(&bios, bm, bm_link); 222 mutex_exit(&bio_lock); 223 return 0; 224 } 225 226 void 227 bio_unregister(device_t dev) 228 { 229 struct bio_mapping *bm, *next; 230 231 mutex_enter(&bio_lock); 232 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 233 next = LIST_NEXT(bm, bm_link); 234 235 if (dev == bm->bm_dev) { 236 LIST_REMOVE(bm, bm_link); 237 free(bm, M_DEVBUF); 238 } 239 } 240 mutex_exit(&bio_lock); 241 } 242 243 static struct bio_mapping * 244 bio_lookup(char *name) 245 { 246 struct bio_mapping *bm; 247 248 mutex_enter(&bio_lock); 249 LIST_FOREACH(bm, &bios, bm_link) { 250 if (strcmp(name, device_xname(bm->bm_dev)) == 0) { 251 mutex_exit(&bio_lock); 252 return bm; 253 } 254 } 255 mutex_exit(&bio_lock); 256 return NULL; 257 } 258 259 static int 260 bio_validate(void *cookie) 261 { 262 struct bio_mapping *bm; 263 264 LIST_FOREACH(bm, &bios, bm_link) 265 if (bm == cookie) 266 return 1; 267 268 return 0; 269 } 270 271 static int 272 bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 273 { 274 struct bio_mapping *bm = cookie; 275 276 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 277 } 278 279 void 280 bio_disk_to_envsys(envsys_data_t *edata, const struct bioc_disk *bd) 281 { 282 switch (bd->bd_status) { 283 case BIOC_SDONLINE: 284 edata->value_cur = ENVSYS_DRIVE_ONLINE; 285 edata->state = ENVSYS_SVALID; 286 break; 287 case BIOC_SDOFFLINE: 288 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 289 edata->state = ENVSYS_SCRITICAL; 290 break; 291 default: 292 edata->value_cur = ENVSYS_DRIVE_FAIL; 293 edata->state = ENVSYS_SCRITICAL; 294 break; 295 } 296 } 297 298 void 299 bio_vol_to_envsys(envsys_data_t *edata, const struct bioc_vol *bv) 300 { 301 switch (bv->bv_status) { 302 case BIOC_SVOFFLINE: 303 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 304 edata->state = ENVSYS_SCRITICAL; 305 break; 306 case BIOC_SVDEGRADED: 307 edata->value_cur = ENVSYS_DRIVE_PFAIL; 308 edata->state = ENVSYS_SCRITICAL; 309 break; 310 case BIOC_SVBUILDING: 311 edata->value_cur = ENVSYS_DRIVE_BUILD; 312 edata->state = ENVSYS_SVALID; 313 break; 314 case BIOC_SVMIGRATING: 315 edata->value_cur = ENVSYS_DRIVE_MIGRATING; 316 edata->state = ENVSYS_SVALID; 317 break; 318 case BIOC_SVCHECKING: 319 edata->value_cur = ENVSYS_DRIVE_CHECK; 320 edata->state = ENVSYS_SVALID; 321 break; 322 case BIOC_SVREBUILD: 323 edata->value_cur = ENVSYS_DRIVE_REBUILD; 324 edata->state = ENVSYS_SCRITICAL; 325 break; 326 case BIOC_SVSCRUB: 327 case BIOC_SVONLINE: 328 edata->value_cur = ENVSYS_DRIVE_ONLINE; 329 edata->state = ENVSYS_SVALID; 330 break; 331 case BIOC_SVINVALID: 332 /* FALLTHROUGH */ 333 default: 334 edata->value_cur = ENVSYS_DRIVE_EMPTY; /* unknown state */ 335 edata->state = ENVSYS_SINVALID; 336 break; 337 } 338 } 339
Indexes created Sun Oct 12 22:09:51 GMT 2025