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/sbuf.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 *, 68 int flags); 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_dumpconf_t (struct sbuf *, const 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 config_geom functions. 87 */ 88 struct g_class { 89 const char *name; 90 g_taste_t *taste; 91 g_config_t *config; 92 g_ctl_req_t *ctlreq; 93 g_init_t *init; 94 g_fini_t *fini; 95 g_ctl_destroy_geom_t *destroy_geom; 96 /* 97 * The remaining elements are private 98 */ 99 LIST_ENTRY(g_class) class; 100 LIST_HEAD(,g_geom) geom; 101 u_int protect; 102 }; 103 104 /* 105 * The g_geom is an instance of a g_class. 106 */ 107 struct 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 unsigned flags; 123 #define G_GEOM_WITHER 1 124 }; 125 126 /* 127 * The g_bioq is a queue of struct bio's. 128 * XXX: possibly collection point for statistics. 129 * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head. 130 */ 131 struct g_bioq { 132 TAILQ_HEAD(, bio) bio_queue; 133 struct mtx bio_queue_lock; 134 int bio_queue_length; 135 }; 136 137 /* 138 * A g_consumer is an attachment point for a g_provider. One g_consumer 139 * can only be attached to one g_provider, but multiple g_consumers 140 * can be attached to one g_provider. 141 */ 142 143 struct g_consumer { 144 u_int protect; 145 struct g_geom *geom; 146 LIST_ENTRY(g_consumer) consumer; 147 struct g_provider *provider; 148 LIST_ENTRY(g_consumer) consumers; /* XXX: better name */ 149 int acr, acw, ace; 150 int spoiled; 151 struct devstat *stat; 152 u_int nstart, nend; 153 }; 154 155 /* 156 * A g_provider is a "logical disk". 157 */ 158 struct g_provider { 159 u_int protect; 160 char *name; 161 LIST_ENTRY(g_provider) provider; 162 struct g_geom *geom; 163 LIST_HEAD(,g_consumer) consumers; 164 int acr, acw, ace; 165 int error; 166 TAILQ_ENTRY(g_provider) orphan; 167 u_int index; 168 off_t mediasize; 169 u_int sectorsize; 170 u_int stripesize; 171 u_int stripeoffset; 172 struct devstat *stat; 173 u_int nstart, nend; 174 u_int flags; 175 #define G_PF_CANDELETE 0x1 176 }; 177 178 /* geom_dev.c */ 179 int g_dev_print(void); 180 181 /* geom_dump.c */ 182 void g_hexdump(void *ptr, int length); 183 void g_trace(int level, const char *, ...); 184 # define G_T_TOPOLOGY 1 185 # define G_T_BIO 2 186 # define G_T_ACCESS 4 187 188 189 /* geom_event.c */ 190 typedef void g_event_t(void *, int flag); 191 #define EV_CANCEL 1 192 int g_post_event(g_event_t *func, void *arg, int flag, ...); 193 int g_waitfor_event(g_event_t *func, void *arg, int flag, ...); 194 void g_cancel_event(void *ref); 195 void g_orphan_provider(struct g_provider *pp, int error); 196 void g_waitidle(void); 197 198 /* geom_subr.c */ 199 int g_access_abs(struct g_consumer *cp, int nread, int nwrite, int nexcl); 200 int g_access_rel(struct g_consumer *cp, int nread, int nwrite, int nexcl); 201 int g_attach(struct g_consumer *cp, struct g_provider *pp); 202 void g_destroy_consumer(struct g_consumer *cp); 203 void g_destroy_geom(struct g_geom *pp); 204 void g_destroy_provider(struct g_provider *pp); 205 void g_detach(struct g_consumer *cp); 206 void g_error_provider(struct g_provider *pp, int error); 207 int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len); 208 #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v)) 209 int g_handleattr(struct bio *bp, const char *attribute, void *val, int len); 210 int g_handleattr_int(struct bio *bp, const char *attribute, int val); 211 int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val); 212 struct g_consumer * g_new_consumer(struct g_geom *gp); 213 struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...); 214 struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...); 215 void g_sanity(void const *ptr); 216 void g_spoil(struct g_provider *pp, struct g_consumer *cp); 217 int g_std_access(struct g_provider *pp, int dr, int dw, int de); 218 void g_std_done(struct bio *bp); 219 void g_std_spoiled(struct g_consumer *cp); 220 void g_wither_geom(struct g_geom *gp, int error); 221 222 int g_modevent(module_t, int, void *); 223 224 /* geom_io.c */ 225 struct bio * g_clone_bio(struct bio *); 226 void g_destroy_bio(struct bio *); 227 void g_io_deliver(struct bio *bp, int error); 228 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr); 229 void g_io_request(struct bio *bp, struct g_consumer *cp); 230 struct bio *g_new_bio(void); 231 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error); 232 int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length); 233 234 /* geom_kern.c / geom_kernsim.c */ 235 236 #ifndef _SYS_CONF_H_ 237 typedef int d_ioctl_t(dev_t dev, u_long cmd, caddr_t data, 238 int fflag, struct thread *td); 239 #endif 240 241 struct g_ioctl { 242 u_long cmd; 243 void *data; 244 int fflag; 245 struct thread *td; 246 d_ioctl_t *func; 247 void *dev; 248 }; 249 250 #ifdef _KERNEL 251 252 struct g_kerneldump { 253 off_t offset; 254 off_t length; 255 }; 256 257 MALLOC_DECLARE(M_GEOM); 258 259 static __inline void * 260 g_malloc(int size, int flags) 261 { 262 void *p; 263 264 p = malloc(size, M_GEOM, flags); 265 g_sanity(p); 266 /* printf("malloc(%d, %x) -> %p\n", size, flags, p); */ 267 return (p); 268 } 269 270 static __inline void 271 g_free(void *ptr) 272 { 273 g_sanity(ptr); 274 /* printf("free(%p)\n", ptr); */ 275 free(ptr, M_GEOM); 276 } 277 278 extern struct sx topology_lock; 279 280 #define g_topology_lock() \ 281 do { \ 282 mtx_assert(&Giant, MA_NOTOWNED); \ 283 sx_xlock(&topology_lock); \ 284 } while (0) 285 286 #define g_topology_unlock() \ 287 do { \ 288 g_sanity(NULL); \ 289 sx_xunlock(&topology_lock); \ 290 } while (0) 291 292 #define g_topology_assert() \ 293 do { \ 294 g_sanity(NULL); \ 295 sx_assert(&topology_lock, SX_XLOCKED); \ 296 } while (0) 297 298 #define DECLARE_GEOM_CLASS(class, name) \ 299 static moduledata_t name##_mod = { \ 300 #name, g_modevent, &class \ 301 }; \ 302 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 303 304 #endif /* _KERNEL */ 305 306 /* geom_ctl.c */ 307 void gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len); 308 void *gctl_get_param(struct gctl_req *req, const char *param, int *len); 309 char const *gctl_get_asciiparam(struct gctl_req *req, const char *param); 310 void *gctl_get_paraml(struct gctl_req *req, const char *param, int len); 311 int gctl_error(struct gctl_req *req, const char *fmt, ...); 312 struct g_class *gctl_get_class(struct gctl_req *req, char const *arg); 313 struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg); 314 struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg); 315 316 #endif /* _GEOM_GEOM_H_ */ 317