bio.c revision 1.13.16.9
1 /* $NetBSD: bio.c,v 1.13.16.9 2019/01/22 07:42:40 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 1.13.16.9 2019/01/22 07:42:40 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 static int 118 bioioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 119 { 120 struct bio_locate *locate; 121 struct bio_common *common; 122 char name[16]; 123 int error; 124 125 switch(cmd) { 126 case BIOCLOCATE: 127 case BIOCINQ: 128 case BIOCDISK: 129 case BIOCDISK_NOVOL: 130 case BIOCVOL: 131 case OBIOCDISK: 132 case OBIOCVOL: 133 error = kauth_authorize_device_passthru(l->l_cred, dev, 134 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 135 if (error) 136 return error; 137 break; 138 case BIOCBLINK: 139 case BIOCSETSTATE: 140 case BIOCVOLOPS: 141 error = kauth_authorize_device_passthru(l->l_cred, dev, 142 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 143 if (error) 144 return error; 145 break; 146 case BIOCALARM: { 147 struct bioc_alarm *alarm = (struct bioc_alarm *)addr; 148 switch (alarm->ba_opcode) { 149 case BIOC_SADISABLE: 150 case BIOC_SAENABLE: 151 case BIOC_SASILENCE: 152 case BIOC_SATEST: 153 error = kauth_authorize_device_passthru(l->l_cred, dev, 154 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_WRITECONF, addr); 155 if (error) 156 return error; 157 break; 158 case BIOC_GASTATUS: 159 error = kauth_authorize_device_passthru(l->l_cred, dev, 160 KAUTH_REQ_DEVICE_RAWIO_PASSTHRU_READCONF, addr); 161 if (error) 162 return error; 163 break; 164 default: 165 return EINVAL; 166 } 167 break; 168 } 169 default: 170 return ENOTTY; 171 } 172 173 switch (cmd) { 174 case BIOCLOCATE: 175 locate = addr; 176 error = copyinstr(locate->bl_name, name, sizeof(name), NULL); 177 if (error != 0) 178 return error; 179 locate->bl_cookie = bio_lookup(name); 180 if (locate->bl_cookie == NULL) 181 return ENOENT; 182 break; 183 184 default: 185 common = addr; 186 mutex_enter(&bio_lock); 187 if (!bio_validate(common->bc_cookie)) { 188 mutex_exit(&bio_lock); 189 return ENOENT; 190 } 191 mutex_exit(&bio_lock); 192 MODULE_CALL_HOOK(compat_bio_30_hook, 193 (common->bc_cookie, cmd, addr, bio_delegate_ioctl), 194 enosys(), error); 195 if (error == ENOSYS) 196 error = bio_delegate_ioctl(common->bc_cookie, cmd, 197 addr); 198 return error; 199 } 200 return 0; 201 } 202 203 int 204 bio_register(device_t dev, int (*ioctl)(device_t, u_long, void *)) 205 { 206 struct bio_mapping *bm; 207 208 if (!bio_lock_initialized) 209 bio_initialize(); 210 211 bm = malloc(sizeof(*bm), M_DEVBUF, M_NOWAIT|M_ZERO); 212 if (bm == NULL) 213 return ENOMEM; 214 bm->bm_dev = dev; 215 bm->bm_ioctl = ioctl; 216 mutex_enter(&bio_lock); 217 LIST_INSERT_HEAD(&bios, bm, bm_link); 218 mutex_exit(&bio_lock); 219 return 0; 220 } 221 222 void 223 bio_unregister(device_t dev) 224 { 225 struct bio_mapping *bm, *next; 226 227 mutex_enter(&bio_lock); 228 for (bm = LIST_FIRST(&bios); bm != NULL; bm = next) { 229 next = LIST_NEXT(bm, bm_link); 230 231 if (dev == bm->bm_dev) { 232 LIST_REMOVE(bm, bm_link); 233 free(bm, M_DEVBUF); 234 } 235 } 236 mutex_exit(&bio_lock); 237 } 238 239 static struct bio_mapping * 240 bio_lookup(char *name) 241 { 242 struct bio_mapping *bm; 243 244 mutex_enter(&bio_lock); 245 LIST_FOREACH(bm, &bios, bm_link) { 246 if (strcmp(name, device_xname(bm->bm_dev)) == 0) { 247 mutex_exit(&bio_lock); 248 return bm; 249 } 250 } 251 mutex_exit(&bio_lock); 252 return NULL; 253 } 254 255 static int 256 bio_validate(void *cookie) 257 { 258 struct bio_mapping *bm; 259 260 LIST_FOREACH(bm, &bios, bm_link) 261 if (bm == cookie) 262 return 1; 263 264 return 0; 265 } 266 267 static int 268 bio_delegate_ioctl(void *cookie, u_long cmd, void *addr) 269 { 270 struct bio_mapping *bm = cookie; 271 272 return bm->bm_ioctl(bm->bm_dev, cmd, addr); 273 } 274 275 void 276 bio_disk_to_envsys(envsys_data_t *edata, const struct bioc_disk *bd) 277 { 278 switch (bd->bd_status) { 279 case BIOC_SDONLINE: 280 edata->value_cur = ENVSYS_DRIVE_ONLINE; 281 edata->state = ENVSYS_SVALID; 282 break; 283 case BIOC_SDOFFLINE: 284 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 285 edata->state = ENVSYS_SCRITICAL; 286 break; 287 default: 288 edata->value_cur = ENVSYS_DRIVE_FAIL; 289 edata->state = ENVSYS_SCRITICAL; 290 break; 291 } 292 } 293 294 void 295 bio_vol_to_envsys(envsys_data_t *edata, const struct bioc_vol *bv) 296 { 297 switch (bv->bv_status) { 298 case BIOC_SVOFFLINE: 299 edata->value_cur = ENVSYS_DRIVE_OFFLINE; 300 edata->state = ENVSYS_SCRITICAL; 301 break; 302 case BIOC_SVDEGRADED: 303 edata->value_cur = ENVSYS_DRIVE_PFAIL; 304 edata->state = ENVSYS_SCRITICAL; 305 break; 306 case BIOC_SVBUILDING: 307 edata->value_cur = ENVSYS_DRIVE_BUILD; 308 edata->state = ENVSYS_SVALID; 309 break; 310 case BIOC_SVMIGRATING: 311 edata->value_cur = ENVSYS_DRIVE_MIGRATING; 312 edata->state = ENVSYS_SVALID; 313 break; 314 case BIOC_SVCHECKING: 315 edata->value_cur = ENVSYS_DRIVE_CHECK; 316 edata->state = ENVSYS_SVALID; 317 break; 318 case BIOC_SVREBUILD: 319 edata->value_cur = ENVSYS_DRIVE_REBUILD; 320 edata->state = ENVSYS_SCRITICAL; 321 break; 322 case BIOC_SVSCRUB: 323 case BIOC_SVONLINE: 324 edata->value_cur = ENVSYS_DRIVE_ONLINE; 325 edata->state = ENVSYS_SVALID; 326 break; 327 case BIOC_SVINVALID: 328 /* FALLTHROUGH */ 329 default: 330 edata->value_cur = ENVSYS_DRIVE_EMPTY; /* unknown state */ 331 edata->state = ENVSYS_SINVALID; 332 break; 333 } 334 } 335
Indexes created Mon Oct 13 16:09:52 GMT 2025