geom.h revision 103009
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 103009 2002-09-06 08:50:28Z phk $ 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/sbuf.h> 47 48#ifdef KERNELSIM 49/* 50 * The GEOM subsystem makes a few concessions in order to be able to run as a 51 * user-land simulation as well as a kernel component. 52 */ 53#include <geom_sim.h> 54#endif 55 56struct g_class; 57struct g_geom; 58struct g_consumer; 59struct g_provider; 60struct g_event; 61struct thread; 62struct bio; 63struct sbuf; 64 65typedef struct g_geom * g_create_geom_t (struct g_class *mp, 66 struct g_provider *pp, char *name); 67typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, 68 int flags); 69#define G_TF_NORMAL 0 70#define G_TF_INSIST 1 71#define G_TF_TRANSPARENT 2 72typedef int g_access_t (struct g_provider *, int, int, int); 73/* XXX: not sure about the thread arg */ 74typedef void g_orphan_t (struct g_consumer *); 75 76typedef void g_start_t (struct bio *); 77typedef void g_spoiled_t (struct g_consumer *); 78typedef void g_dumpconf_t (struct sbuf *, char *indent, struct g_geom *, 79 struct g_consumer *, struct g_provider *); 80 81/* 82 * The g_class structure describes a transformation class. In other words 83 * all BSD disklabel handlers share one g_class, all MBR handlers share 84 * one common g_class and so on. 85 * Certain operations are instantiated on the class, most notably the 86 * taste and create_geom functions. 87 */ 88struct g_class { 89 char *name; 90 g_taste_t *taste; 91 g_create_geom_t *create_geom; 92 /* 93 * The remaning elements are private and classes should use 94 * the G_CLASS_INITIALIZER macro to initialize them. 95 */ 96 LIST_ENTRY(g_class) class; 97 LIST_HEAD(,g_geom) geom; 98 struct g_event *event; 99 u_int protect; 100}; 101 102#define G_CLASS_INITIALIZER { 0, 0 }, { 0 }, 0, 0 103 104/* 105 * The g_geom is an instance of a g_class. 106 */ 107struct g_geom { 108 u_int protect; 109 char *name; 110 struct g_class *class; 111 LIST_ENTRY(g_geom) geom; 112 LIST_HEAD(,g_consumer) consumer; 113 LIST_HEAD(,g_provider) provider; 114 TAILQ_ENTRY(g_geom) geoms; /* XXX: better name */ 115 int rank; 116 g_start_t *start; 117 g_spoiled_t *spoiled; 118 g_dumpconf_t *dumpconf; 119 g_access_t *access; 120 g_orphan_t *orphan; 121 void *softc; 122 struct g_event *event; 123 unsigned flags; 124#define G_GEOM_WITHER 1 125}; 126 127/* 128 * The g_bioq is a queue of struct bio's. 129 * XXX: possibly collection point for statistics. 130 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head. 131 */ 132struct g_bioq { 133 TAILQ_HEAD(, bio) bio_queue; 134 struct mtx bio_queue_lock; 135 int bio_queue_length; 136}; 137 138/* 139 * A g_consumer is an attachment point for a g_provider. One g_consumer 140 * can only be attached to one g_provider, but multiple g_consumers 141 * can be attached to one g_provider. 142 */ 143 144struct g_consumer { 145 u_int protect; 146 struct g_geom *geom; 147 LIST_ENTRY(g_consumer) consumer; 148 struct g_provider *provider; 149 LIST_ENTRY(g_consumer) consumers; /* XXX: better name */ 150 int acr, acw, ace; 151 struct g_event *event; 152 153 int biocount; 154 int spoiled; 155}; 156 157/* 158 * A g_provider is a "logical disk". 159 */ 160struct g_provider { 161 u_int protect; 162 char *name; 163 LIST_ENTRY(g_provider) provider; 164 struct g_geom *geom; 165 LIST_HEAD(,g_consumer) consumers; 166 int acr, acw, ace; 167 int error; 168 struct g_event *event; 169 TAILQ_ENTRY(g_provider) orphan; 170 int index; 171 off_t mediasize; 172}; 173 174/* geom_dump.c */ 175void g_hexdump(void *ptr, int length); 176void g_trace(int level, char *, ...); 177# define G_T_TOPOLOGY 1 178# define G_T_BIO 2 179# define G_T_ACCESS 4 180 181/* geom_enc.c */ 182uint32_t g_dec_be2(u_char *p); 183uint32_t g_dec_be4(u_char *p); 184uint32_t g_dec_le2(u_char *p); 185uint32_t g_dec_le4(u_char *p); 186void g_enc_le4(u_char *p, uint32_t u); 187 188/* geom_event.c */ 189void g_orphan_provider(struct g_provider *pp, int error); 190void g_waitidle(void); 191void g_silence(void); 192 193/* geom_subr.c */ 194int g_access_abs(struct g_consumer *cp, int read, int write, int exclusive); 195int g_access_rel(struct g_consumer *cp, int read, int write, int exclusive); 196void g_add_class(struct g_class *mp); 197int g_attach(struct g_consumer *cp, struct g_provider *pp); 198struct g_geom *g_create_geomf(char *class, struct g_provider *, char *fmt, ...); 199void g_destroy_consumer(struct g_consumer *cp); 200void g_destroy_geom(struct g_geom *pp); 201void g_destroy_provider(struct g_provider *pp); 202void g_detach(struct g_consumer *cp); 203void g_error_provider(struct g_provider *pp, int error); 204int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len); 205#define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v)) 206int g_handleattr(struct bio *bp, char *attribute, void *val, int len); 207int g_handleattr_int(struct bio *bp, char *attribute, int val); 208int g_handleattr_off_t(struct bio *bp, char *attribute, off_t val); 209struct g_geom * g_insert_geom(char *class, struct g_consumer *cp); 210struct g_consumer * g_new_consumer(struct g_geom *gp); 211struct g_geom * g_new_geomf(struct g_class *mp, char *fmt, ...); 212struct g_provider * g_new_providerf(struct g_geom *gp, char *fmt, ...); 213void g_sanity(void *ptr); 214void g_spoil(struct g_provider *pp, struct g_consumer *cp); 215int g_std_access(struct g_provider *pp, int dr, int dw, int de); 216void g_std_done(struct bio *bp); 217void g_std_spoiled(struct g_consumer *cp); 218 219/* geom_io.c */ 220struct bio * g_clone_bio(struct bio *); 221void g_destroy_bio(struct bio *); 222void g_io_deliver(struct bio *bp); 223void g_io_fail(struct bio *bp, int error); 224int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr); 225void g_io_request(struct bio *bp, struct g_consumer *cp); 226int g_io_setattr(const char *attr, struct g_consumer *cp, int len, void *ptr); 227struct bio *g_new_bio(void); 228void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error); 229 230/* geom_kern.c / geom_kernsim.c */ 231 232struct g_ioctl { 233 u_long cmd; 234 void *data; 235 int fflag; 236 struct thread *td; 237}; 238 239#ifdef _KERNEL 240 241struct g_kerneldump { 242 off_t offset; 243 off_t length; 244}; 245 246MALLOC_DECLARE(M_GEOM); 247 248static __inline void * 249g_malloc(int size, int flags) 250{ 251 void *p; 252 253 p = malloc(size, M_GEOM, flags); 254 g_sanity(p); 255 /* printf("malloc(%d, %x) -> %p\n", size, flags, p); */ 256 return (p); 257} 258 259static __inline void 260g_free(void *ptr) 261{ 262 g_sanity(ptr); 263 /* printf("free(%p)\n", ptr); */ 264 free(ptr, M_GEOM); 265} 266 267extern struct sx topology_lock; 268 269#define g_topology_lock() \ 270 do { \ 271 mtx_assert(&Giant, MA_NOTOWNED); \ 272 sx_xlock(&topology_lock); \ 273 } while (0) 274 275#define g_topology_unlock() \ 276 do { \ 277 g_sanity(NULL); \ 278 sx_xunlock(&topology_lock); \ 279 } while (0) 280 281#define g_topology_assert() \ 282 do { \ 283 g_sanity(NULL); \ 284 sx_assert(&topology_lock, SX_XLOCKED); \ 285 } while (0) 286 287#define DECLARE_GEOM_CLASS(class, name) \ 288 static void \ 289 name##init(void) \ 290 { \ 291 mtx_unlock(&Giant); \ 292 g_add_class(&class); \ 293 mtx_lock(&Giant); \ 294 } \ 295 SYSINIT(name, SI_SUB_PSEUDO, SI_ORDER_FIRST, name##init, NULL); 296 297#endif /* _KERNEL */ 298 299#define GEOMGETCONF _IOWR('G', 0, struct sbuf) 300 301#endif /* _GEOM_GEOM_H_ */ 302