geom.h revision 221101
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: head/sys/geom/geom.h 221101 2011-04-27 00:10:26Z mav $ 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/sbuf.h> 48#include <sys/module.h> 49 50struct g_class; 51struct g_geom; 52struct g_consumer; 53struct g_provider; 54struct g_stat; 55struct thread; 56struct bio; 57struct sbuf; 58struct gctl_req; 59struct g_configargs; 60 61typedef int g_config_t (struct g_configargs *ca); 62typedef void g_ctl_req_t (struct gctl_req *, struct g_class *cp, char const *verb); 63typedef int g_ctl_create_geom_t (struct gctl_req *, struct g_class *cp, struct g_provider *pp); 64typedef int g_ctl_destroy_geom_t (struct gctl_req *, struct g_class *cp, struct g_geom *gp); 65typedef int g_ctl_config_geom_t (struct gctl_req *, struct g_geom *gp, const char *verb); 66typedef void g_init_t (struct g_class *mp); 67typedef void g_fini_t (struct g_class *mp); 68typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, int flags); 69typedef int g_ioctl_t(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td); 70#define G_TF_NORMAL 0 71#define G_TF_INSIST 1 72#define G_TF_TRANSPARENT 2 73typedef int g_access_t (struct g_provider *, int, int, int); 74/* XXX: not sure about the thread arg */ 75typedef void g_orphan_t (struct g_consumer *); 76 77typedef void g_start_t (struct bio *); 78typedef void g_spoiled_t (struct g_consumer *); 79typedef void g_dumpconf_t (struct sbuf *, const char *indent, struct g_geom *, 80 struct g_consumer *, struct g_provider *); 81 82/* 83 * The g_class structure describes a transformation class. In other words 84 * all BSD disklabel handlers share one g_class, all MBR handlers share 85 * one common g_class and so on. 86 * Certain operations are instantiated on the class, most notably the 87 * taste and config_geom functions. 88 */ 89struct g_class { 90 const char *name; 91 u_int version; 92 g_taste_t *taste; 93 g_config_t *config; 94 g_ctl_req_t *ctlreq; 95 g_init_t *init; 96 g_fini_t *fini; 97 g_ctl_destroy_geom_t *destroy_geom; 98 /* 99 * Default values for geom methods 100 */ 101 g_start_t *start; 102 g_spoiled_t *spoiled; 103 g_dumpconf_t *dumpconf; 104 g_access_t *access; 105 g_orphan_t *orphan; 106 g_ioctl_t *ioctl; 107 /* 108 * The remaining elements are private 109 */ 110 LIST_ENTRY(g_class) class; 111 LIST_HEAD(,g_geom) geom; 112}; 113 114#define G_VERSION_00 0x19950323 115#define G_VERSION_01 0x20041207 /* add fflag to g_ioctl_t */ 116#define G_VERSION G_VERSION_01 117 118/* 119 * The g_geom is an instance of a g_class. 120 */ 121struct g_geom { 122 char *name; 123 struct g_class *class; 124 LIST_ENTRY(g_geom) geom; 125 LIST_HEAD(,g_consumer) consumer; 126 LIST_HEAD(,g_provider) provider; 127 TAILQ_ENTRY(g_geom) geoms; /* XXX: better name */ 128 int rank; 129 g_start_t *start; 130 g_spoiled_t *spoiled; 131 g_dumpconf_t *dumpconf; 132 g_access_t *access; 133 g_orphan_t *orphan; 134 g_ioctl_t *ioctl; 135 void *softc; 136 unsigned flags; 137#define G_GEOM_WITHER 1 138#define G_GEOM_VOLATILE_BIO 2 139}; 140 141/* 142 * The g_bioq is a queue of struct bio's. 143 * XXX: possibly collection point for statistics. 144 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head. 145 */ 146struct g_bioq { 147 TAILQ_HEAD(, bio) bio_queue; 148 struct mtx bio_queue_lock; 149 int bio_queue_length; 150}; 151 152/* 153 * A g_consumer is an attachment point for a g_provider. One g_consumer 154 * can only be attached to one g_provider, but multiple g_consumers 155 * can be attached to one g_provider. 156 */ 157 158struct g_consumer { 159 struct g_geom *geom; 160 LIST_ENTRY(g_consumer) consumer; 161 struct g_provider *provider; 162 LIST_ENTRY(g_consumer) consumers; /* XXX: better name */ 163 int acr, acw, ace; 164 int spoiled; 165 struct devstat *stat; 166 u_int nstart, nend; 167 168 /* Two fields for the implementing class to use */ 169 void *private; 170 u_int index; 171}; 172 173/* 174 * A g_provider is a "logical disk". 175 */ 176struct g_provider { 177 char *name; 178 LIST_ENTRY(g_provider) provider; 179 struct g_geom *geom; 180 LIST_HEAD(,g_consumer) consumers; 181 int acr, acw, ace; 182 int error; 183 TAILQ_ENTRY(g_provider) orphan; 184 off_t mediasize; 185 u_int sectorsize; 186 u_int stripesize; 187 u_int stripeoffset; 188 struct devstat *stat; 189 u_int nstart, nend; 190 u_int flags; 191#define G_PF_CANDELETE 0x1 192#define G_PF_WITHER 0x2 193#define G_PF_ORPHAN 0x4 194 195 /* Two fields for the implementing class to use */ 196 void *private; 197 u_int index; 198}; 199 200/* 201 * Descriptor of a classifier. We can register a function and 202 * an argument, which is called by g_io_request() on bio's 203 * that are not previously classified. 204 */ 205struct g_classifier_hook { 206 TAILQ_ENTRY(g_classifier_hook) link; 207 int (*func)(void *arg, struct bio *bp); 208 void *arg; 209}; 210 211/* BIO_GETATTR("GEOM::setstate") argument values. */ 212#define G_STATE_FAILED 0 213#define G_STATE_REBUILD 1 214#define G_STATE_RESYNC 2 215#define G_STATE_ACTIVE 3 216 217/* geom_dev.c */ 218struct cdev; 219void g_dev_print(void); 220struct g_provider *g_dev_getprovider(struct cdev *dev); 221 222/* geom_dump.c */ 223void g_trace(int level, const char *, ...); 224# define G_T_TOPOLOGY 1 225# define G_T_BIO 2 226# define G_T_ACCESS 4 227 228 229/* geom_event.c */ 230typedef void g_event_t(void *, int flag); 231#define EV_CANCEL 1 232int g_post_event(g_event_t *func, void *arg, int flag, ...); 233int g_waitfor_event(g_event_t *func, void *arg, int flag, ...); 234void g_cancel_event(void *ref); 235void g_orphan_provider(struct g_provider *pp, int error); 236void g_waitidlelock(void); 237 238/* geom_subr.c */ 239int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl); 240int g_attach(struct g_consumer *cp, struct g_provider *pp); 241int g_compare_names(const char *namea, const char *nameb); 242void g_destroy_consumer(struct g_consumer *cp); 243void g_destroy_geom(struct g_geom *pp); 244void g_destroy_provider(struct g_provider *pp); 245void g_detach(struct g_consumer *cp); 246void g_error_provider(struct g_provider *pp, int error); 247struct g_provider *g_provider_by_name(char const *arg); 248int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len); 249#define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v)) 250int g_handleattr(struct bio *bp, const char *attribute, const void *val, 251 int len); 252int g_handleattr_int(struct bio *bp, const char *attribute, int val); 253int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val); 254int g_handleattr_str(struct bio *bp, const char *attribute, const char *str); 255struct g_consumer * g_new_consumer(struct g_geom *gp); 256struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...); 257struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...); 258int g_retaste(struct g_class *mp); 259void g_spoil(struct g_provider *pp, struct g_consumer *cp); 260int g_std_access(struct g_provider *pp, int dr, int dw, int de); 261void g_std_done(struct bio *bp); 262void g_std_spoiled(struct g_consumer *cp); 263void g_wither_geom(struct g_geom *gp, int error); 264void g_wither_geom_close(struct g_geom *gp, int error); 265void g_wither_provider(struct g_provider *pp, int error); 266 267#if defined(DIAGNOSTIC) || defined(DDB) 268int g_valid_obj(void const *ptr); 269#endif 270#ifdef DIAGNOSTIC 271#define G_VALID_CLASS(foo) \ 272 KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo)) 273#define G_VALID_GEOM(foo) \ 274 KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo)) 275#define G_VALID_CONSUMER(foo) \ 276 KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo)) 277#define G_VALID_PROVIDER(foo) \ 278 KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo)) 279#else 280#define G_VALID_CLASS(foo) do { } while (0) 281#define G_VALID_GEOM(foo) do { } while (0) 282#define G_VALID_CONSUMER(foo) do { } while (0) 283#define G_VALID_PROVIDER(foo) do { } while (0) 284#endif 285 286int g_modevent(module_t, int, void *); 287 288/* geom_io.c */ 289struct bio * g_clone_bio(struct bio *); 290struct bio * g_duplicate_bio(struct bio *); 291void g_destroy_bio(struct bio *); 292void g_io_deliver(struct bio *bp, int error); 293int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr); 294int g_io_flush(struct g_consumer *cp); 295int g_register_classifier(struct g_classifier_hook *hook); 296void g_unregister_classifier(struct g_classifier_hook *hook); 297void g_io_request(struct bio *bp, struct g_consumer *cp); 298struct bio *g_new_bio(void); 299struct bio *g_alloc_bio(void); 300void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error); 301int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length); 302int g_delete_data(struct g_consumer *cp, off_t offset, off_t length); 303void g_print_bio(struct bio *bp); 304 305/* geom_kern.c / geom_kernsim.c */ 306 307#ifdef _KERNEL 308 309extern struct sx topology_lock; 310 311struct g_kerneldump { 312 off_t offset; 313 off_t length; 314 struct dumperinfo di; 315}; 316 317MALLOC_DECLARE(M_GEOM); 318 319static __inline void * 320g_malloc(int size, int flags) 321{ 322 void *p; 323 324 p = malloc(size, M_GEOM, flags); 325 return (p); 326} 327 328static __inline void 329g_free(void *ptr) 330{ 331 332#ifdef DIAGNOSTIC 333 if (sx_xlocked(&topology_lock)) { 334 KASSERT(g_valid_obj(ptr) == 0, 335 ("g_free(%p) of live object, type %d", ptr, 336 g_valid_obj(ptr))); 337 } 338#endif 339 free(ptr, M_GEOM); 340} 341 342#define g_topology_lock() \ 343 do { \ 344 mtx_assert(&Giant, MA_NOTOWNED); \ 345 sx_xlock(&topology_lock); \ 346 } while (0) 347 348#define g_topology_try_lock() sx_try_xlock(&topology_lock) 349 350#define g_topology_unlock() \ 351 do { \ 352 sx_xunlock(&topology_lock); \ 353 } while (0) 354 355#define g_topology_assert() \ 356 do { \ 357 sx_assert(&topology_lock, SX_XLOCKED); \ 358 } while (0) 359 360#define g_topology_assert_not() \ 361 do { \ 362 sx_assert(&topology_lock, SX_UNLOCKED); \ 363 } while (0) 364 365#define g_topology_sleep(chan, timo) \ 366 sx_sleep(chan, &topology_lock, 0, "gtopol", timo) 367 368#define DECLARE_GEOM_CLASS(class, name) \ 369 static moduledata_t name##_mod = { \ 370 #name, g_modevent, &class \ 371 }; \ 372 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 373 374#endif /* _KERNEL */ 375 376/* geom_ctl.c */ 377int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len); 378void gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr, int len); 379void *gctl_get_param(struct gctl_req *req, const char *param, int *len); 380char const *gctl_get_asciiparam(struct gctl_req *req, const char *param); 381void *gctl_get_paraml(struct gctl_req *req, const char *param, int len); 382int gctl_error(struct gctl_req *req, const char *fmt, ...) __printflike(2, 3); 383struct g_class *gctl_get_class(struct gctl_req *req, char const *arg); 384struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg); 385struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg); 386 387#endif /* _GEOM_GEOM_H_ */ 388