sys/geom/geom.h

   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 struct disk_zone_args;
  60
  61 typedef int g_config_t (struct g_configargs *ca);
  62 typedef void g_ctl_req_t (struct gctl_req *, struct g_class *cp, char const *verb);
  63 typedef int g_ctl_create_geom_t (struct gctl_req *, struct g_class *cp, struct g_provider *pp);
  64 typedef int g_ctl_destroy_geom_t (struct gctl_req *, struct g_class *cp, struct g_geom *gp);
  65 typedef int g_ctl_config_geom_t (struct gctl_req *, struct g_geom *gp, const char *verb);
  66 typedef void g_init_t (struct g_class *mp);
  67 typedef void g_fini_t (struct g_class *mp);
  68 typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, int flags);
  69 typedef 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
  73 typedef int g_access_t (struct g_provider *, int, int, int);
  74 /* XXX: not sure about the thread arg */
  75 typedef void g_orphan_t (struct g_consumer *);
  76
  77 typedef void g_start_t (struct bio *);
  78 typedef void g_spoiled_t (struct g_consumer *);
  79 typedef void g_attrchanged_t (struct g_consumer *, const char *attr);
  80 typedef void g_provgone_t (struct g_provider *);
  81 typedef void g_dumpconf_t (struct sbuf *, const char *indent, struct g_geom *,
  82     struct g_consumer *, struct g_provider *);
  83 typedef void g_resize_t(struct g_consumer *cp);
  84
  85 /*
  86  * The g_class structure describes a transformation class.  In other words
  87  * all BSD disklabel handlers share one g_class, all MBR handlers share
  88  * one common g_class and so on.
  89  * Certain operations are instantiated on the class, most notably the
  90  * taste and config_geom functions.
  91  */
  92 struct g_class {
  93         const char              *name;
  94         u_int                   version;
  95         u_int                   spare0;
  96         g_taste_t               *taste;
  97         g_config_t              *config;
  98         g_ctl_req_t             *ctlreq;
  99         g_init_t                *init;
 100         g_fini_t                *fini;
 101         g_ctl_destroy_geom_t    *destroy_geom;
 102         /*
 103          * Default values for geom methods
 104          */
 105         g_start_t               *start;
 106         g_spoiled_t             *spoiled;
 107         g_attrchanged_t         *attrchanged;
 108         g_dumpconf_t            *dumpconf;
 109         g_access_t              *access;
 110         g_orphan_t              *orphan;
 111         g_ioctl_t               *ioctl;
 112         g_provgone_t            *providergone;
 113         g_resize_t              *resize;
 114         void                    *spare1;
 115         void                    *spare2;
 116         /*
 117          * The remaining elements are private
 118          */
 119         LIST_ENTRY(g_class)     class;
 120         LIST_HEAD(,g_geom)      geom;
 121 };
 122
 123 #define G_VERSION_00    0x19950323
 124 #define G_VERSION_01    0x20041207      /* add fflag to g_ioctl_t */
 125 #define G_VERSION       G_VERSION_01
 126
 127 /*
 128  * The g_geom is an instance of a g_class.
 129  */
 130 struct g_geom {
 131         char                    *name;
 132         struct g_class          *class;
 133         LIST_ENTRY(g_geom)      geom;
 134         LIST_HEAD(,g_consumer)  consumer;
 135         LIST_HEAD(,g_provider)  provider;
 136         TAILQ_ENTRY(g_geom)     geoms;  /* XXX: better name */
 137         int                     rank;
 138         g_start_t               *start;
 139         g_spoiled_t             *spoiled;
 140         g_attrchanged_t         *attrchanged;
 141         g_dumpconf_t            *dumpconf;
 142         g_access_t              *access;
 143         g_orphan_t              *orphan;
 144         g_ioctl_t               *ioctl;
 145         g_provgone_t            *providergone;
 146         g_resize_t              *resize;
 147         void                    *spare0;
 148         void                    *spare1;
 149         void                    *softc;
 150         unsigned                flags;
 151 #define G_GEOM_WITHER           1
 152 #define G_GEOM_VOLATILE_BIO     2
 153 };
 154
 155 /*
 156  * The g_bioq is a queue of struct bio's.
 157  * XXX: possibly collection point for statistics.
 158  * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head.
 159  */
 160 struct g_bioq {
 161         TAILQ_HEAD(, bio)       bio_queue;
 162         struct mtx              bio_queue_lock;
 163         int                     bio_queue_length;
 164 };
 165
 166 /*
 167  * A g_consumer is an attachment point for a g_provider.  One g_consumer
 168  * can only be attached to one g_provider, but multiple g_consumers
 169  * can be attached to one g_provider.
 170  */
 171
 172 struct g_consumer {
 173         struct g_geom           *geom;
 174         LIST_ENTRY(g_consumer)  consumer;
 175         struct g_provider       *provider;
 176         LIST_ENTRY(g_consumer)  consumers;      /* XXX: better name */
 177         int                     acr, acw, ace;
 178         int                     flags;
 179 #define G_CF_SPOILED            0x1
 180 #define G_CF_ORPHAN             0x4
 181 #define G_CF_DIRECT_SEND        0x10
 182 #define G_CF_DIRECT_RECEIVE     0x20
 183         struct devstat          *stat;
 184         u_int                   nstart, nend;
 185
 186         /* Two fields for the implementing class to use */
 187         void                    *private;
 188         u_int                   index;
 189 };
 190
 191 /*
 192  * A g_provider is a "logical disk".
 193  */
 194 struct g_provider {
 195         char                    *name;
 196         LIST_ENTRY(g_provider)  provider;
 197         struct g_geom           *geom;
 198         LIST_HEAD(,g_consumer)  consumers;
 199         int                     acr, acw, ace;
 200         int                     error;
 201         TAILQ_ENTRY(g_provider) orphan;
 202         off_t                   mediasize;
 203         u_int                   sectorsize;
 204         u_int                   stripesize;
 205         u_int                   stripeoffset;
 206         struct devstat          *stat;
 207         u_int                   nstart, nend;
 208         u_int                   flags;
 209 #define G_PF_WITHER             0x2
 210 #define G_PF_ORPHAN             0x4
 211 #define G_PF_ACCEPT_UNMAPPED    0x8
 212 #define G_PF_DIRECT_SEND        0x10
 213 #define G_PF_DIRECT_RECEIVE     0x20
 214
 215         /* Two fields for the implementing class to use */
 216         void                    *private;
 217         u_int                   index;
 218 };
 219
 220 /*
 221  * Descriptor of a classifier. We can register a function and
 222  * an argument, which is called by g_io_request() on bio's
 223  * that are not previously classified.
 224  */
 225 struct g_classifier_hook {
 226         TAILQ_ENTRY(g_classifier_hook) link;
 227         int                     (*func)(void *arg, struct bio *bp);
 228         void                    *arg;
 229 };
 230
 231 /* BIO_GETATTR("GEOM::setstate") argument values. */
 232 #define G_STATE_FAILED          0
 233 #define G_STATE_REBUILD         1
 234 #define G_STATE_RESYNC          2
 235 #define G_STATE_ACTIVE          3
 236
 237 /* geom_dev.c */
 238 struct cdev;
 239 void g_dev_print(void);
 240 void g_dev_physpath_changed(void);
 241 struct g_provider *g_dev_getprovider(struct cdev *dev);
 242
 243 /* geom_dump.c */
 244 void g_trace(int level, const char *, ...);
 245 #       define G_T_TOPOLOGY     1
 246 #       define G_T_BIO          2
 247 #       define G_T_ACCESS       4
 248
 249
 250 /* geom_event.c */
 251 typedef void g_event_t(void *, int flag);
 252 #define EV_CANCEL       1
 253 int g_post_event(g_event_t *func, void *arg, int flag, ...);
 254 int g_waitfor_event(g_event_t *func, void *arg, int flag, ...);
 255 void g_cancel_event(void *ref);
 256 int g_attr_changed(struct g_provider *pp, const char *attr, int flag);
 257 int g_media_changed(struct g_provider *pp, int flag);
 258 int g_media_gone(struct g_provider *pp, int flag);
 259 void g_orphan_provider(struct g_provider *pp, int error);
 260 void g_waitidlelock(void);
 261
 262 /* geom_subr.c */
 263 int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl);
 264 int g_attach(struct g_consumer *cp, struct g_provider *pp);
 265 int g_compare_names(const char *namea, const char *nameb);
 266 void g_destroy_consumer(struct g_consumer *cp);
 267 void g_destroy_geom(struct g_geom *pp);
 268 void g_destroy_provider(struct g_provider *pp);
 269 void g_detach(struct g_consumer *cp);
 270 void g_error_provider(struct g_provider *pp, int error);
 271 struct g_provider *g_provider_by_name(char const *arg);
 272 int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len);
 273 #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v))
 274 int g_handleattr(struct bio *bp, const char *attribute, const void *val,
 275     int len);
 276 int g_handleattr_int(struct bio *bp, const char *attribute, int val);
 277 int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val);
 278 int g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val);
 279 int g_handleattr_str(struct bio *bp, const char *attribute, const char *str);
 280 struct g_consumer * g_new_consumer(struct g_geom *gp);
 281 struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...)
 282     __printflike(2, 3);
 283 struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...)
 284     __printflike(2, 3);
 285 void g_resize_provider(struct g_provider *pp, off_t size);
 286 int g_retaste(struct g_class *mp);
 287 void g_spoil(struct g_provider *pp, struct g_consumer *cp);
 288 int g_std_access(struct g_provider *pp, int dr, int dw, int de);
 289 void g_std_done(struct bio *bp);
 290 void g_std_spoiled(struct g_consumer *cp);
 291 void g_wither_geom(struct g_geom *gp, int error);
 292 void g_wither_geom_close(struct g_geom *gp, int error);
 293 void g_wither_provider(struct g_provider *pp, int error);
 294
 295 #if defined(DIAGNOSTIC) || defined(DDB)
 296 int g_valid_obj(void const *ptr);
 297 #endif
 298 #ifdef DIAGNOSTIC
 299 #define G_VALID_CLASS(foo) \
 300     KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo))
 301 #define G_VALID_GEOM(foo) \
 302     KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo))
 303 #define G_VALID_CONSUMER(foo) \
 304     KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo))
 305 #define G_VALID_PROVIDER(foo) \
 306     KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo))
 307 #else
 308 #define G_VALID_CLASS(foo) do { } while (0)
 309 #define G_VALID_GEOM(foo) do { } while (0)
 310 #define G_VALID_CONSUMER(foo) do { } while (0)
 311 #define G_VALID_PROVIDER(foo) do { } while (0)
 312 #endif
 313
 314 int g_modevent(module_t, int, void *);
 315
 316 /* geom_io.c */
 317 struct bio * g_clone_bio(struct bio *);
 318 struct bio * g_duplicate_bio(struct bio *);
 319 void g_destroy_bio(struct bio *);
 320 void g_io_deliver(struct bio *bp, int error);
 321 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
 322 int g_io_zonecmd(struct disk_zone_args *zone_args, struct g_consumer *cp);
 323 int g_io_flush(struct g_consumer *cp);
 324 int g_register_classifier(struct g_classifier_hook *hook);
 325 void g_unregister_classifier(struct g_classifier_hook *hook);
 326 void g_io_request(struct bio *bp, struct g_consumer *cp);
 327 struct bio *g_new_bio(void);
 328 struct bio *g_alloc_bio(void);
 329 void g_reset_bio(struct bio *);
 330 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error);
 331 int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length);
 332 int g_delete_data(struct g_consumer *cp, off_t offset, off_t length);
 333 void g_print_bio(struct bio *bp);
 334
 335 /* geom_kern.c / geom_kernsim.c */
 336
 337 #ifdef _KERNEL
 338
 339 extern struct sx topology_lock;
 340
 341 struct g_kerneldump {
 342         off_t           offset;
 343         off_t           length;
 344         struct dumperinfo di;
 345 };
 346
 347 MALLOC_DECLARE(M_GEOM);
 348
 349 static __inline void *
 350 g_malloc(int size, int flags)
 351 {
 352         void *p;
 353
 354         p = malloc(size, M_GEOM, flags);
 355         return (p);
 356 }
 357
 358 static __inline void
 359 g_free(void *ptr)
 360 {
 361
 362 #ifdef DIAGNOSTIC
 363         if (sx_xlocked(&topology_lock)) {
 364                 KASSERT(g_valid_obj(ptr) == 0,
 365                     ("g_free(%p) of live object, type %d", ptr,
 366                     g_valid_obj(ptr)));
 367         }
 368 #endif
 369         free(ptr, M_GEOM);
 370 }
 371
 372 #define g_topology_lock()                                       \
 373         do {                                                    \
 374                 sx_xlock(&topology_lock);                       \
 375         } while (0)
 376
 377 #define g_topology_try_lock()   sx_try_xlock(&topology_lock)
 378
 379 #define g_topology_unlock()                                     \
 380         do {                                                    \
 381                 sx_xunlock(&topology_lock);                     \
 382         } while (0)
 383
 384 #define g_topology_assert()                                     \
 385         do {                                                    \
 386                 sx_assert(&topology_lock, SX_XLOCKED);          \
 387         } while (0)
 388
 389 #define g_topology_assert_not()                                 \
 390         do {                                                    \
 391                 sx_assert(&topology_lock, SX_UNLOCKED);         \
 392         } while (0)
 393
 394 #define g_topology_sleep(chan, timo)                            \
 395         sx_sleep(chan, &topology_lock, 0, "gtopol", timo)
 396
 397 #define DECLARE_GEOM_CLASS(class, name)                         \
 398         static moduledata_t name##_mod = {                      \
 399                 #name, g_modevent, &class                       \
 400         };                                                      \
 401         DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
 402
 403 int g_is_geom_thread(struct thread *td);
 404
 405 #endif /* _KERNEL */
 406
 407 /* geom_ctl.c */
 408 int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len);
 409 void gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr, int len);
 410 void *gctl_get_param(struct gctl_req *req, const char *param, int *len);
 411 char const *gctl_get_asciiparam(struct gctl_req *req, const char *param);
 412 void *gctl_get_paraml(struct gctl_req *req, const char *param, int len);
 413 int gctl_error(struct gctl_req *req, const char *fmt, ...) __printflike(2, 3);
 414 struct g_class *gctl_get_class(struct gctl_req *req, char const *arg);
 415 struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg);
 416 struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg);
 417
 418 #endif /* _GEOM_GEOM_H_ */