1 /*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD$ 36 */ 37 38 #ifndef _GEOM_GEOM_H_ 39 #define _GEOM_GEOM_H_ 40 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/sx.h> 44 #include <sys/queue.h> 45 #include <sys/ioccom.h> 46 #include <sys/conf.h> 47 #include <sys/module.h> 48 49 struct g_class; 50 struct g_geom; 51 struct g_consumer; 52 struct g_provider; 53 struct g_stat; 54 struct thread; 55 struct bio; 56 struct sbuf; 57 struct gctl_req; 58 struct g_configargs; 59 60 typedef int g_config_t (struct g_configargs *ca); 61 typedef void g_ctl_req_t (struct gctl_req *, struct g_class *cp, char const *verb); 62 typedef int g_ctl_create_geom_t (struct gctl_req *, struct g_class *cp, struct g_provider *pp); 63 typedef int g_ctl_destroy_geom_t (struct gctl_req *, struct g_class *cp, struct g_geom *gp); 64 typedef int g_ctl_config_geom_t (struct gctl_req *, struct g_geom *gp, const char *verb); 65 typedef void g_init_t (struct g_class *mp); 66 typedef void g_fini_t (struct g_class *mp); 67 typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, int flags); 68 typedef int g_ioctl_t(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td); 69 #define G_TF_NORMAL 0 70 #define G_TF_INSIST 1 71 #define G_TF_TRANSPARENT 2 72 typedef int g_access_t (struct g_provider *, int, int, int); 73 /* XXX: not sure about the thread arg */ 74 typedef void g_orphan_t (struct g_consumer *); 75 76 typedef void g_start_t (struct bio *); 77 typedef void g_spoiled_t (struct g_consumer *); 78 typedef void g_attrchanged_t (struct g_consumer *, const char *attr); 79 typedef void g_provgone_t (struct g_provider *); 80 typedef void g_dumpconf_t (struct sbuf *, const char *indent, struct g_geom *, 81 struct g_consumer *, struct g_provider *); 82 typedef void g_resize_t(struct g_consumer *cp); 83 84 /* 85 * The g_class structure describes a transformation class. In other words 86 * all BSD disklabel handlers share one g_class, all MBR handlers share 87 * one common g_class and so on. 88 * Certain operations are instantiated on the class, most notably the 89 * taste and config_geom functions. 90 */ 91 struct g_class { 92 const char *name; 93 u_int version; 94 u_int spare0; 95 g_taste_t *taste; 96 g_config_t *config; 97 g_ctl_req_t *ctlreq; 98 g_init_t *init; 99 g_fini_t *fini; 100 g_ctl_destroy_geom_t *destroy_geom; 101 /* 102 * Default values for geom methods 103 */ 104 g_start_t *start; 105 g_spoiled_t *spoiled; 106 g_attrchanged_t *attrchanged; 107 g_dumpconf_t *dumpconf; 108 g_access_t *access; 109 g_orphan_t *orphan; 110 g_ioctl_t *ioctl; 111 g_provgone_t *providergone; 112 g_resize_t *resize; 113 void *spare1; 114 void *spare2; 115 /* 116 * The remaining elements are private 117 */ 118 LIST_ENTRY(g_class) class; 119 LIST_HEAD(,g_geom) geom; 120 }; 121 122 #define G_VERSION_00 0x19950323 123 #define G_VERSION_01 0x20041207 /* add fflag to g_ioctl_t */ 124 #define G_VERSION G_VERSION_01 125 126 /* 127 * The g_geom is an instance of a g_class. 128 */ 129 struct g_geom { 130 char *name; 131 struct g_class *class; 132 LIST_ENTRY(g_geom) geom; 133 LIST_HEAD(,g_consumer) consumer; 134 LIST_HEAD(,g_provider) provider; 135 TAILQ_ENTRY(g_geom) geoms; /* XXX: better name */ 136 int rank; 137 g_start_t *start; 138 g_spoiled_t *spoiled; 139 g_attrchanged_t *attrchanged; 140 g_dumpconf_t *dumpconf; 141 g_access_t *access; 142 g_orphan_t *orphan; 143 g_ioctl_t *ioctl; 144 g_provgone_t *providergone; 145 g_resize_t *resize; 146 void *spare0; 147 void *spare1; 148 void *softc; 149 unsigned flags; 150 #define G_GEOM_WITHER 1 151 #define G_GEOM_VOLATILE_BIO 2 152 }; 153 154 /* 155 * The g_bioq is a queue of struct bio's. 156 * XXX: possibly collection point for statistics. 157 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head. 158 */ 159 struct g_bioq { 160 TAILQ_HEAD(, bio) bio_queue; 161 struct mtx bio_queue_lock; 162 int bio_queue_length; 163 }; 164 165 /* 166 * A g_consumer is an attachment point for a g_provider. One g_consumer 167 * can only be attached to one g_provider, but multiple g_consumers 168 * can be attached to one g_provider. 169 */ 170 171 struct g_consumer { 172 struct g_geom *geom; 173 LIST_ENTRY(g_consumer) consumer; 174 struct g_provider *provider; 175 LIST_ENTRY(g_consumer) consumers; /* XXX: better name */ 176 int acr, acw, ace; 177 int flags; 178 #define G_CF_SPOILED 0x1 179 #define G_CF_ORPHAN 0x4 180 #define G_CF_DIRECT_SEND 0x10 181 #define G_CF_DIRECT_RECEIVE 0x20 182 struct devstat *stat; 183 u_int nstart, nend; 184 185 /* Two fields for the implementing class to use */ 186 void *private; 187 u_int index; 188 }; 189 190 /* 191 * A g_provider is a "logical disk". 192 */ 193 struct g_provider { 194 char *name; 195 LIST_ENTRY(g_provider) provider; 196 struct g_geom *geom; 197 LIST_HEAD(,g_consumer) consumers; 198 int acr, acw, ace; 199 int error; 200 TAILQ_ENTRY(g_provider) orphan; 201 off_t mediasize; 202 u_int sectorsize; 203 u_int stripesize; 204 u_int stripeoffset; 205 struct devstat *stat; 206 u_int nstart, nend; 207 u_int flags; 208 #define G_PF_WITHER 0x2 209 #define G_PF_ORPHAN 0x4 210 #define G_PF_ACCEPT_UNMAPPED 0x8 211 #define G_PF_DIRECT_SEND 0x10 212 #define G_PF_DIRECT_RECEIVE 0x20 213 214 /* Two fields for the implementing class to use */ 215 void *private; 216 u_int index; 217 }; 218 219 /* 220 * Descriptor of a classifier. We can register a function and 221 * an argument, which is called by g_io_request() on bio's 222 * that are not previously classified. 223 */ 224 struct g_classifier_hook { 225 TAILQ_ENTRY(g_classifier_hook) link; 226 int (*func)(void *arg, struct bio *bp); 227 void *arg; 228 }; 229 230 /* BIO_GETATTR("GEOM::setstate") argument values. */ 231 #define G_STATE_FAILED 0 232 #define G_STATE_REBUILD 1 233 #define G_STATE_RESYNC 2 234 #define G_STATE_ACTIVE 3 235 236 /* geom_dev.c */ 237 struct cdev; 238 void g_dev_print(void); 239 void g_dev_physpath_changed(void); 240 struct g_provider *g_dev_getprovider(struct cdev *dev); 241 242 /* geom_dump.c */ 243 void g_trace(int level, const char *, ...); 244 # define G_T_TOPOLOGY 1 245 # define G_T_BIO 2 246 # define G_T_ACCESS 4 247 248 249 /* geom_event.c */ 250 typedef void g_event_t(void *, int flag); 251 #define EV_CANCEL 1 252 int g_post_event(g_event_t *func, void *arg, int flag, ...); 253 int g_waitfor_event(g_event_t *func, void *arg, int flag, ...); 254 void g_cancel_event(void *ref); 255 int g_attr_changed(struct g_provider *pp, const char *attr, int flag); 256 int g_media_changed(struct g_provider *pp, int flag); 257 int g_media_gone(struct g_provider *pp, int flag); 258 void g_orphan_provider(struct g_provider *pp, int error); 259 void g_waitidlelock(void); 260 261 /* geom_subr.c */ 262 int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl); 263 int g_attach(struct g_consumer *cp, struct g_provider *pp); 264 int g_compare_names(const char *namea, const char *nameb); 265 void g_destroy_consumer(struct g_consumer *cp); 266 void g_destroy_geom(struct g_geom *pp); 267 void g_destroy_provider(struct g_provider *pp); 268 void g_detach(struct g_consumer *cp); 269 void g_error_provider(struct g_provider *pp, int error); 270 struct g_provider *g_provider_by_name(char const *arg); 271 int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len); 272 #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v)) 273 int g_handleattr(struct bio *bp, const char *attribute, const void *val, 274 int len); 275 int g_handleattr_int(struct bio *bp, const char *attribute, int val); 276 int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val); 277 int g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val); 278 int g_handleattr_str(struct bio *bp, const char *attribute, const char *str); 279 struct g_consumer * g_new_consumer(struct g_geom *gp); 280 struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...) 281 __printflike(2, 3); 282 struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...) 283 __printflike(2, 3); 284 void g_resize_provider(struct g_provider *pp, off_t size); 285 int g_retaste(struct g_class *mp); 286 void g_spoil(struct g_provider *pp, struct g_consumer *cp); 287 int g_std_access(struct g_provider *pp, int dr, int dw, int de); 288 void g_std_done(struct bio *bp); 289 void g_std_spoiled(struct g_consumer *cp); 290 void g_wither_geom(struct g_geom *gp, int error); 291 void g_wither_geom_close(struct g_geom *gp, int error); 292 void g_wither_provider(struct g_provider *pp, int error); 293 294 #if defined(DIAGNOSTIC) || defined(DDB) 295 int g_valid_obj(void const *ptr); 296 #endif 297 #ifdef DIAGNOSTIC 298 #define G_VALID_CLASS(foo) \ 299 KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo)) 300 #define G_VALID_GEOM(foo) \ 301 KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo)) 302 #define G_VALID_CONSUMER(foo) \ 303 KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo)) 304 #define G_VALID_PROVIDER(foo) \ 305 KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo)) 306 #else 307 #define G_VALID_CLASS(foo) do { } while (0) 308 #define G_VALID_GEOM(foo) do { } while (0) 309 #define G_VALID_CONSUMER(foo) do { } while (0) 310 #define G_VALID_PROVIDER(foo) do { } while (0) 311 #endif 312 313 int g_modevent(module_t, int, void *); 314 315 /* geom_io.c */ 316 struct bio * g_clone_bio(struct bio *); 317 struct bio * g_duplicate_bio(struct bio *); 318 void g_destroy_bio(struct bio *); 319 void g_io_deliver(struct bio *bp, int error); 320 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr); 321 int g_io_flush(struct g_consumer *cp); 322 int g_register_classifier(struct g_classifier_hook *hook); 323 void g_unregister_classifier(struct g_classifier_hook *hook); 324 void g_io_request(struct bio *bp, struct g_consumer *cp); 325 struct bio *g_new_bio(void); 326 struct bio *g_alloc_bio(void); 327 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error); 328 int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length); 329 int g_delete_data(struct g_consumer *cp, off_t offset, off_t length); 330 void g_print_bio(struct bio *bp); 331 332 /* geom_kern.c / geom_kernsim.c */ 333 334 #ifdef _KERNEL 335 336 extern struct sx topology_lock; 337 338 struct g_kerneldump { 339 off_t offset; 340 off_t length; 341 struct dumperinfo di; 342 }; 343 344 MALLOC_DECLARE(M_GEOM); 345 346 static __inline void * 347 g_malloc(int size, int flags) 348 { 349 void *p; 350 351 p = malloc(size, M_GEOM, flags); 352 return (p); 353 } 354 355 static __inline void 356 g_free(void *ptr) 357 { 358 359 #ifdef DIAGNOSTIC 360 if (sx_xlocked(&topology_lock)) { 361 KASSERT(g_valid_obj(ptr) == 0, 362 ("g_free(%p) of live object, type %d", ptr, 363 g_valid_obj(ptr))); 364 } 365 #endif 366 free(ptr, M_GEOM); 367 } 368 369 #define g_topology_lock() \ 370 do { \ 371 mtx_assert(&Giant, MA_NOTOWNED); \ 372 sx_xlock(&topology_lock); \ 373 } while (0) 374 375 #define g_topology_try_lock() sx_try_xlock(&topology_lock) 376 377 #define g_topology_unlock() \ 378 do { \ 379 sx_xunlock(&topology_lock); \ 380 } while (0) 381 382 #define g_topology_assert() \ 383 do { \ 384 sx_assert(&topology_lock, SX_XLOCKED); \ 385 } while (0) 386 387 #define g_topology_assert_not() \ 388 do { \ 389 sx_assert(&topology_lock, SX_UNLOCKED); \ 390 } while (0) 391 392 #define g_topology_sleep(chan, timo) \ 393 sx_sleep(chan, &topology_lock, 0, "gtopol", timo) 394 395 #define DECLARE_GEOM_CLASS(class, name) \ 396 static moduledata_t name##_mod = { \ 397 #name, g_modevent, &class \ 398 }; \ 399 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 400 401 int g_is_geom_thread(struct thread *td); 402 403 #endif /* _KERNEL */ 404 405 /* geom_ctl.c */ 406 int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len); 407 void gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr, int len); 408 void *gctl_get_param(struct gctl_req *req, const char *param, int *len); 409 char const *gctl_get_asciiparam(struct gctl_req *req, const char *param); 410 void *gctl_get_paraml(struct gctl_req *req, const char *param, int len); 411 int gctl_error(struct gctl_req *req, const char *fmt, ...) __printflike(2, 3); 412 struct g_class *gctl_get_class(struct gctl_req *req, char const *arg); 413 struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg); 414 struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg); 415 416 #endif /* _GEOM_GEOM_H_ */ 417