geom.h revision 133312
192108Sphk/*- 292108Sphk * Copyright (c) 2002 Poul-Henning Kamp 392108Sphk * Copyright (c) 2002 Networks Associates Technology, Inc. 492108Sphk * All rights reserved. 592108Sphk * 692108Sphk * This software was developed for the FreeBSD Project by Poul-Henning Kamp 792108Sphk * and NAI Labs, the Security Research Division of Network Associates, Inc. 892108Sphk * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 992108Sphk * DARPA CHATS research program. 1092108Sphk * 1192108Sphk * Redistribution and use in source and binary forms, with or without 1292108Sphk * modification, are permitted provided that the following conditions 1392108Sphk * are met: 1492108Sphk * 1. Redistributions of source code must retain the above copyright 1592108Sphk * notice, this list of conditions and the following disclaimer. 1692108Sphk * 2. Redistributions in binary form must reproduce the above copyright 1792108Sphk * notice, this list of conditions and the following disclaimer in the 1892108Sphk * documentation and/or other materials provided with the distribution. 1992108Sphk * 3. The names of the authors may not be used to endorse or promote 2092108Sphk * products derived from this software without specific prior written 2192108Sphk * permission. 2292108Sphk * 2392108Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2492108Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2592108Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2692108Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2792108Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2892108Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2992108Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3092108Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3192108Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3292108Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3392108Sphk * SUCH DAMAGE. 3492108Sphk * 3592108Sphk * $FreeBSD: head/sys/geom/geom.h 133312 2004-08-08 06:46:27Z phk $ 3692108Sphk */ 3792108Sphk 3895276Sphk#ifndef _GEOM_GEOM_H_ 3995276Sphk#define _GEOM_GEOM_H_ 4095276Sphk 4192108Sphk#include <sys/lock.h> 4292108Sphk#include <sys/mutex.h> 4392108Sphk#include <sys/sx.h> 4492108Sphk#include <sys/queue.h> 4595323Sphk#include <sys/ioccom.h> 4695323Sphk#include <sys/sbuf.h> 47115473Sphk#include <sys/module.h> 4892108Sphk 4993248Sphkstruct g_class; 5092108Sphkstruct g_geom; 5192108Sphkstruct g_consumer; 5292108Sphkstruct g_provider; 53110541Sphkstruct g_stat; 5492108Sphkstruct thread; 5592108Sphkstruct bio; 5692108Sphkstruct sbuf; 57112709Sphkstruct gctl_req; 58106518Sphkstruct g_configargs; 5992108Sphk 60106518Sphktypedef int g_config_t (struct g_configargs *ca); 61115624Sphktypedef void g_ctl_req_t (struct gctl_req *, struct g_class *cp, char const *verb); 62112709Sphktypedef int g_ctl_create_geom_t (struct gctl_req *, struct g_class *cp, struct g_provider *pp); 63112709Sphktypedef int g_ctl_destroy_geom_t (struct gctl_req *, struct g_class *cp, struct g_geom *gp); 64113876Sphktypedef int g_ctl_config_geom_t (struct gctl_req *, struct g_geom *gp, const char *verb); 65115473Sphktypedef void g_init_t (struct g_class *mp); 66115473Sphktypedef void g_fini_t (struct g_class *mp); 67119660Sphktypedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, int flags); 68119660Sphktypedef int g_ioctl_t(struct g_provider *pp, u_long cmd, void *data, struct thread *td); 6992108Sphk#define G_TF_NORMAL 0 7092108Sphk#define G_TF_INSIST 1 7192108Sphk#define G_TF_TRANSPARENT 2 7292108Sphktypedef int g_access_t (struct g_provider *, int, int, int); 7392108Sphk/* XXX: not sure about the thread arg */ 7493250Sphktypedef void g_orphan_t (struct g_consumer *); 7592108Sphk 7692108Sphktypedef void g_start_t (struct bio *); 7792108Sphktypedef void g_spoiled_t (struct g_consumer *); 78107953Sphktypedef void g_dumpconf_t (struct sbuf *, const char *indent, struct g_geom *, 7992108Sphk struct g_consumer *, struct g_provider *); 8092108Sphk 8192108Sphk/* 8293248Sphk * The g_class structure describes a transformation class. In other words 8393248Sphk * all BSD disklabel handlers share one g_class, all MBR handlers share 8493248Sphk * one common g_class and so on. 8593248Sphk * Certain operations are instantiated on the class, most notably the 86106518Sphk * taste and config_geom functions. 8792108Sphk */ 8893248Sphkstruct g_class { 89107953Sphk const char *name; 90133312Sphk u_int version; 9192108Sphk g_taste_t *taste; 92106518Sphk g_config_t *config; 93115624Sphk g_ctl_req_t *ctlreq; 94115473Sphk g_init_t *init; 95115473Sphk g_fini_t *fini; 96112709Sphk g_ctl_destroy_geom_t *destroy_geom; 9793776Sphk /* 98133312Sphk * Defaults values for geom methods 99133312Sphk */ 100133312Sphk g_start_t *start; 101133312Sphk g_spoiled_t *spoiled; 102133312Sphk g_dumpconf_t *dumpconf; 103133312Sphk g_access_t *access; 104133312Sphk g_orphan_t *orphan; 105133312Sphk g_ioctl_t *ioctl; 106133312Sphk /* 107115468Sphk * The remaining elements are private 108115468Sphk */ 10993248Sphk LIST_ENTRY(g_class) class; 11092108Sphk LIST_HEAD(,g_geom) geom; 11192108Sphk}; 11292108Sphk 113133312Sphk#define G_VERSION_00 0x19950323 114133312Sphk#define G_VERSION G_VERSION_00 115133312Sphk 11692108Sphk/* 11793248Sphk * The g_geom is an instance of a g_class. 11892108Sphk */ 11992108Sphkstruct g_geom { 12092108Sphk char *name; 12193248Sphk struct g_class *class; 12292108Sphk LIST_ENTRY(g_geom) geom; 12392108Sphk LIST_HEAD(,g_consumer) consumer; 12492108Sphk LIST_HEAD(,g_provider) provider; 12592108Sphk TAILQ_ENTRY(g_geom) geoms; /* XXX: better name */ 12692108Sphk int rank; 12792108Sphk g_start_t *start; 12892108Sphk g_spoiled_t *spoiled; 12992108Sphk g_dumpconf_t *dumpconf; 13093776Sphk g_access_t *access; 13193776Sphk g_orphan_t *orphan; 132119660Sphk g_ioctl_t *ioctl; 13392108Sphk void *softc; 13492108Sphk unsigned flags; 13592108Sphk#define G_GEOM_WITHER 1 13692108Sphk}; 13792108Sphk 13892108Sphk/* 13992108Sphk * The g_bioq is a queue of struct bio's. 14092108Sphk * XXX: possibly collection point for statistics. 14192108Sphk * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head. 14292108Sphk */ 14392108Sphkstruct g_bioq { 14492108Sphk TAILQ_HEAD(, bio) bio_queue; 14592108Sphk struct mtx bio_queue_lock; 14692108Sphk int bio_queue_length; 14792108Sphk}; 14892108Sphk 14992108Sphk/* 15092108Sphk * A g_consumer is an attachment point for a g_provider. One g_consumer 15192108Sphk * can only be attached to one g_provider, but multiple g_consumers 15292108Sphk * can be attached to one g_provider. 15392108Sphk */ 15492108Sphk 15592108Sphkstruct g_consumer { 15692108Sphk struct g_geom *geom; 15792108Sphk LIST_ENTRY(g_consumer) consumer; 15892108Sphk struct g_provider *provider; 15992108Sphk LIST_ENTRY(g_consumer) consumers; /* XXX: better name */ 16092108Sphk int acr, acw, ace; 16192108Sphk int spoiled; 162112370Sphk struct devstat *stat; 163112026Sphk u_int nstart, nend; 164125743Sphk 165125743Sphk /* Two fields for the implementing class to use */ 166125743Sphk void *private; 167125743Sphk u_int index; 16892108Sphk}; 16992108Sphk 17092108Sphk/* 17192108Sphk * A g_provider is a "logical disk". 17292108Sphk */ 17392108Sphkstruct g_provider { 17492108Sphk char *name; 17592108Sphk LIST_ENTRY(g_provider) provider; 17692108Sphk struct g_geom *geom; 17792108Sphk LIST_HEAD(,g_consumer) consumers; 17892108Sphk int acr, acw, ace; 17992108Sphk int error; 18092108Sphk TAILQ_ENTRY(g_provider) orphan; 18193778Sphk off_t mediasize; 182105542Sphk u_int sectorsize; 183110710Sphk u_int stripesize; 184110710Sphk u_int stripeoffset; 185112370Sphk struct devstat *stat; 186112026Sphk u_int nstart, nend; 187110690Sphk u_int flags; 188110690Sphk#define G_PF_CANDELETE 0x1 189120851Sphk#define G_PF_WITHER 0x2 190123233Sphk#define G_PF_ORPHAN 0x4 191125743Sphk 192125743Sphk /* Two fields for the implementing class to use */ 193125743Sphk void *private; 194125743Sphk u_int index; 19592108Sphk}; 19692108Sphk 197105947Sphk/* geom_dev.c */ 198130585Sphkstruct cdev; 199115960Sphkvoid g_dev_print(void); 200130585Sphkstruct g_provider *g_dev_getprovider(struct cdev *dev); 201105947Sphk 20292108Sphk/* geom_dump.c */ 203107953Sphkvoid g_trace(int level, const char *, ...); 20492108Sphk# define G_T_TOPOLOGY 1 20592108Sphk# define G_T_BIO 2 20692108Sphk# define G_T_ACCESS 4 20792108Sphk 20893090Sphk 20992108Sphk/* geom_event.c */ 210113937Sphktypedef void g_event_t(void *, int flag); 211112989Sphk#define EV_CANCEL 1 212113937Sphkint g_post_event(g_event_t *func, void *arg, int flag, ...); 213113940Sphkint g_waitfor_event(g_event_t *func, void *arg, int flag, ...); 214112989Sphkvoid g_cancel_event(void *ref); 21592108Sphkvoid g_orphan_provider(struct g_provider *pp, int error); 21698066Sphkvoid g_waitidle(void); 21792108Sphk 21892108Sphk/* geom_subr.c */ 219125755Sphkint g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl); 22092108Sphkint g_attach(struct g_consumer *cp, struct g_provider *pp); 22192108Sphkvoid g_destroy_consumer(struct g_consumer *cp); 22292108Sphkvoid g_destroy_geom(struct g_geom *pp); 22392108Sphkvoid g_destroy_provider(struct g_provider *pp); 22498066Sphkvoid g_detach(struct g_consumer *cp); 22592108Sphkvoid g_error_provider(struct g_provider *pp, int error); 226115850Sphkstruct g_provider *g_provider_by_name(char const *arg); 22794284Sphkint g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len); 22894284Sphk#define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v)) 229107953Sphkint g_handleattr(struct bio *bp, const char *attribute, void *val, int len); 230107953Sphkint g_handleattr_int(struct bio *bp, const char *attribute, int val); 231107953Sphkint g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val); 23292108Sphkstruct g_consumer * g_new_consumer(struct g_geom *gp); 233107953Sphkstruct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...); 234107953Sphkstruct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...); 23592108Sphkvoid g_spoil(struct g_provider *pp, struct g_consumer *cp); 23692108Sphkint g_std_access(struct g_provider *pp, int dr, int dw, int de); 23792108Sphkvoid g_std_done(struct bio *bp); 23892108Sphkvoid g_std_spoiled(struct g_consumer *cp); 239114495Sphkvoid g_wither_geom(struct g_geom *gp, int error); 24092108Sphk 241126798Sphk#ifdef DIAGNOSTIC 242126798Sphkint g_valid_obj(void const *ptr); 243126798Sphk#define G_VALID_CLASS(foo) \ 244126798Sphk KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo)) 245126798Sphk#define G_VALID_GEOM(foo) \ 246126798Sphk KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo)) 247126798Sphk#define G_VALID_CONSUMER(foo) \ 248126798Sphk KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo)) 249126798Sphk#define G_VALID_PROVIDER(foo) \ 250126798Sphk KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo)) 251126798Sphk#else 252126798Sphk#define G_VALID_CLASS(foo) do { } while (0) 253126798Sphk#define G_VALID_GEOM(foo) do { } while (0) 254126798Sphk#define G_VALID_CONSUMER(foo) do { } while (0) 255126798Sphk#define G_VALID_PROVIDER(foo) do { } while (0) 256126798Sphk#endif 257126798Sphk 258115473Sphkint g_modevent(module_t, int, void *); 259115473Sphk 26092108Sphk/* geom_io.c */ 26192108Sphkstruct bio * g_clone_bio(struct bio *); 26292108Sphkvoid g_destroy_bio(struct bio *); 263104195Sphkvoid g_io_deliver(struct bio *bp, int error); 26494283Sphkint g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr); 26592108Sphkvoid g_io_request(struct bio *bp, struct g_consumer *cp); 26692108Sphkstruct bio *g_new_bio(void); 26792108Sphkvoid * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error); 268104194Sphkint g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length); 269125713Spjdvoid g_print_bio(struct bio *bp); 27092108Sphk 27192108Sphk/* geom_kern.c / geom_kernsim.c */ 27292108Sphk 27392108Sphk#ifdef _KERNEL 27492108Sphk 27595038Sphkstruct g_kerneldump { 27695038Sphk off_t offset; 27795038Sphk off_t length; 27895038Sphk}; 27995038Sphk 28092108SphkMALLOC_DECLARE(M_GEOM); 28192108Sphk 28292108Sphkstatic __inline void * 28392108Sphkg_malloc(int size, int flags) 28492108Sphk{ 28592108Sphk void *p; 28692108Sphk 28792108Sphk p = malloc(size, M_GEOM, flags); 28892108Sphk return (p); 28992108Sphk} 29092108Sphk 29192108Sphkstatic __inline void 29292108Sphkg_free(void *ptr) 29392108Sphk{ 294126798Sphk 295126798Sphk#ifdef DIAGNOSTIC 296126798Sphk KASSERT(g_valid_obj(ptr) == 0, 297126798Sphk ("g_free(%p) of live object, type %d", ptr, g_valid_obj(ptr))); 298126798Sphk#endif 29992108Sphk free(ptr, M_GEOM); 30092108Sphk} 30192108Sphk 30292108Sphkextern struct sx topology_lock; 30392108Sphk 30496987Sphk#define g_topology_lock() \ 30596987Sphk do { \ 30696987Sphk mtx_assert(&Giant, MA_NOTOWNED); \ 30796987Sphk sx_xlock(&topology_lock); \ 30896987Sphk } while (0) 30996987Sphk 31096987Sphk#define g_topology_unlock() \ 31196987Sphk do { \ 31296987Sphk sx_xunlock(&topology_lock); \ 31396987Sphk } while (0) 31496987Sphk 31596987Sphk#define g_topology_assert() \ 31696987Sphk do { \ 31796987Sphk sx_assert(&topology_lock, SX_XLOCKED); \ 31896987Sphk } while (0) 31996987Sphk 320125656Spjd#define g_topology_assert_not() \ 321125656Spjd do { \ 322125656Spjd sx_assert(&topology_lock, SX_UNLOCKED); \ 323125656Spjd } while (0) 324125656Spjd 325115473Sphk#define DECLARE_GEOM_CLASS(class, name) \ 326115473Sphk static moduledata_t name##_mod = { \ 327115473Sphk #name, g_modevent, &class \ 328115473Sphk }; \ 329115473Sphk DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 330105061Sphk 33195310Sphk#endif /* _KERNEL */ 33292108Sphk 333112709Sphk/* geom_ctl.c */ 334115624Sphkvoid gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len); 335112709Sphkvoid *gctl_get_param(struct gctl_req *req, const char *param, int *len); 336115624Sphkchar const *gctl_get_asciiparam(struct gctl_req *req, const char *param); 337113892Sphkvoid *gctl_get_paraml(struct gctl_req *req, const char *param, int len); 338113892Sphkint gctl_error(struct gctl_req *req, const char *fmt, ...); 339115624Sphkstruct g_class *gctl_get_class(struct gctl_req *req, char const *arg); 340115624Sphkstruct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg); 341115624Sphkstruct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg); 342112709Sphk 34395276Sphk#endif /* _GEOM_GEOM_H_ */ 344