The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom.h

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    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: releng/7.4/sys/geom/geom.h 189935 2009-03-17 19:38:40Z marcel $
   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 *, int flags);
   68 typedef int g_ioctl_t(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td);
   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         u_int                   version;
   91         g_taste_t               *taste;
   92         g_config_t              *config;
   93         g_ctl_req_t             *ctlreq;
   94         g_init_t                *init;
   95         g_fini_t                *fini;
   96         g_ctl_destroy_geom_t    *destroy_geom;
   97         /*
   98          * Default values for geom methods
   99          */
  100         g_start_t               *start;
  101         g_spoiled_t             *spoiled;
  102         g_dumpconf_t            *dumpconf;
  103         g_access_t              *access;
  104         g_orphan_t              *orphan;
  105         g_ioctl_t               *ioctl;
  106         /*
  107          * The remaining elements are private
  108          */
  109         LIST_ENTRY(g_class)     class;
  110         LIST_HEAD(,g_geom)      geom;
  111 };
  112 
  113 #define G_VERSION_00    0x19950323
  114 #define G_VERSION_01    0x20041207      /* add fflag to g_ioctl_t */
  115 #define G_VERSION       G_VERSION_01
  116 
  117 /*
  118  * The g_geom is an instance of a g_class.
  119  */
  120 struct g_geom {
  121         char                    *name;
  122         struct g_class          *class;
  123         LIST_ENTRY(g_geom)      geom;
  124         LIST_HEAD(,g_consumer)  consumer;
  125         LIST_HEAD(,g_provider)  provider;
  126         TAILQ_ENTRY(g_geom)     geoms;  /* XXX: better name */
  127         int                     rank;
  128         g_start_t               *start;
  129         g_spoiled_t             *spoiled;
  130         g_dumpconf_t            *dumpconf;
  131         g_access_t              *access;
  132         g_orphan_t              *orphan;
  133         g_ioctl_t               *ioctl;
  134         void                    *softc;
  135         unsigned                flags;
  136 #define G_GEOM_WITHER           1
  137 };
  138 
  139 /*
  140  * The g_bioq is a queue of struct bio's.
  141  * XXX: possibly collection point for statistics.
  142  * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head.
  143  */
  144 struct g_bioq {
  145         TAILQ_HEAD(, bio)       bio_queue;
  146         struct mtx              bio_queue_lock;
  147         int                     bio_queue_length;
  148 };
  149 
  150 /*
  151  * A g_consumer is an attachment point for a g_provider.  One g_consumer
  152  * can only be attached to one g_provider, but multiple g_consumers
  153  * can be attached to one g_provider.
  154  */
  155 
  156 struct g_consumer {
  157         struct g_geom           *geom;
  158         LIST_ENTRY(g_consumer)  consumer;
  159         struct g_provider       *provider;
  160         LIST_ENTRY(g_consumer)  consumers;      /* XXX: better name */
  161         int                     acr, acw, ace;
  162         int                     spoiled;
  163         struct devstat          *stat;
  164         u_int                   nstart, nend;
  165 
  166         /* Two fields for the implementing class to use */
  167         void                    *private;
  168         u_int                   index;
  169 };
  170 
  171 /*
  172  * A g_provider is a "logical disk".
  173  */
  174 struct g_provider {
  175         char                    *name;
  176         LIST_ENTRY(g_provider)  provider;
  177         struct g_geom           *geom;
  178         LIST_HEAD(,g_consumer)  consumers;
  179         int                     acr, acw, ace;
  180         int                     error;
  181         TAILQ_ENTRY(g_provider) orphan;
  182         off_t                   mediasize;
  183         u_int                   sectorsize;
  184         u_int                   stripesize;
  185         u_int                   stripeoffset;
  186         struct devstat          *stat;
  187         u_int                   nstart, nend;
  188         u_int                   flags;
  189 #define G_PF_CANDELETE          0x1
  190 #define G_PF_WITHER             0x2
  191 #define G_PF_ORPHAN             0x4
  192 
  193         /* Two fields for the implementing class to use */
  194         void                    *private;
  195         u_int                   index;
  196 };
  197 
  198 /* geom_dev.c */
  199 struct cdev;
  200 void g_dev_print(void);
  201 struct g_provider *g_dev_getprovider(struct cdev *dev);
  202 
  203 /* geom_dump.c */
  204 void g_trace(int level, const char *, ...);
  205 #       define G_T_TOPOLOGY     1
  206 #       define G_T_BIO          2
  207 #       define G_T_ACCESS       4
  208 
  209 
  210 /* geom_event.c */
  211 typedef void g_event_t(void *, int flag);
  212 #define EV_CANCEL       1
  213 int g_post_event(g_event_t *func, void *arg, int flag, ...);
  214 int g_waitfor_event(g_event_t *func, void *arg, int flag, ...);
  215 void g_cancel_event(void *ref);
  216 void g_orphan_provider(struct g_provider *pp, int error);
  217 void g_waitidlelock(void);
  218 
  219 /* geom_subr.c */
  220 int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl);
  221 int g_attach(struct g_consumer *cp, struct g_provider *pp);
  222 void g_destroy_consumer(struct g_consumer *cp);
  223 void g_destroy_geom(struct g_geom *pp);
  224 void g_destroy_provider(struct g_provider *pp);
  225 void g_detach(struct g_consumer *cp);
  226 void g_error_provider(struct g_provider *pp, int error);
  227 struct g_provider *g_provider_by_name(char const *arg);
  228 int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len);
  229 #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v))
  230 int g_handleattr(struct bio *bp, const char *attribute, const void *val,
  231     int len);
  232 int g_handleattr_int(struct bio *bp, const char *attribute, int val);
  233 int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val);
  234 int g_handleattr_str(struct bio *bp, const char *attribute, const char *str);
  235 struct g_consumer * g_new_consumer(struct g_geom *gp);
  236 struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...);
  237 struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...);
  238 int g_retaste(struct g_class *mp);
  239 void g_spoil(struct g_provider *pp, struct g_consumer *cp);
  240 int g_std_access(struct g_provider *pp, int dr, int dw, int de);
  241 void g_std_done(struct bio *bp);
  242 void g_std_spoiled(struct g_consumer *cp);
  243 void g_wither_geom(struct g_geom *gp, int error);
  244 void g_wither_geom_close(struct g_geom *gp, int error);
  245 void g_wither_provider(struct g_provider *pp, int error);
  246 
  247 #if defined(DIAGNOSTIC) || defined(DDB)
  248 int g_valid_obj(void const *ptr);
  249 #endif
  250 #ifdef DIAGNOSTIC
  251 #define G_VALID_CLASS(foo) \
  252     KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo))
  253 #define G_VALID_GEOM(foo) \
  254     KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo))
  255 #define G_VALID_CONSUMER(foo) \
  256     KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo))
  257 #define G_VALID_PROVIDER(foo) \
  258     KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo))
  259 #else
  260 #define G_VALID_CLASS(foo) do { } while (0)
  261 #define G_VALID_GEOM(foo) do { } while (0)
  262 #define G_VALID_CONSUMER(foo) do { } while (0)
  263 #define G_VALID_PROVIDER(foo) do { } while (0)
  264 #endif
  265 
  266 int g_modevent(module_t, int, void *);
  267 
  268 /* geom_io.c */
  269 struct bio * g_clone_bio(struct bio *);
  270 struct bio * g_duplicate_bio(struct bio *);
  271 void g_destroy_bio(struct bio *);
  272 void g_io_deliver(struct bio *bp, int error);
  273 int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
  274 int g_io_flush(struct g_consumer *cp);
  275 void g_io_request(struct bio *bp, struct g_consumer *cp);
  276 struct bio *g_new_bio(void);
  277 struct bio *g_alloc_bio(void);
  278 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error);
  279 int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length);
  280 int g_delete_data(struct g_consumer *cp, off_t offset, off_t length);
  281 void g_print_bio(struct bio *bp);
  282 
  283 /* geom_kern.c / geom_kernsim.c */
  284 
  285 #ifdef _KERNEL
  286 
  287 extern struct sx topology_lock;
  288 
  289 struct g_kerneldump {
  290         off_t           offset;
  291         off_t           length;
  292 };
  293 
  294 MALLOC_DECLARE(M_GEOM);
  295 
  296 static __inline void *
  297 g_malloc(int size, int flags)
  298 {
  299         void *p;
  300 
  301         p = malloc(size, M_GEOM, flags);
  302         return (p);
  303 }
  304 
  305 static __inline void
  306 g_free(void *ptr)
  307 {
  308 
  309 #ifdef DIAGNOSTIC
  310         if (sx_xlocked(&topology_lock)) {
  311                 KASSERT(g_valid_obj(ptr) == 0,
  312                     ("g_free(%p) of live object, type %d", ptr,
  313                     g_valid_obj(ptr)));
  314         }
  315 #endif
  316         free(ptr, M_GEOM);
  317 }
  318 
  319 #define g_topology_lock()                                       \
  320         do {                                                    \
  321                 mtx_assert(&Giant, MA_NOTOWNED);                \
  322                 sx_xlock(&topology_lock);                       \
  323         } while (0)
  324 
  325 #define g_topology_try_lock()   sx_try_xlock(&topology_lock)
  326 
  327 #define g_topology_unlock()                                     \
  328         do {                                                    \
  329                 sx_xunlock(&topology_lock);                     \
  330         } while (0)
  331 
  332 #define g_topology_assert()                                     \
  333         do {                                                    \
  334                 sx_assert(&topology_lock, SX_XLOCKED);          \
  335         } while (0)
  336 
  337 #define g_topology_assert_not()                                 \
  338         do {                                                    \
  339                 sx_assert(&topology_lock, SX_UNLOCKED);         \
  340         } while (0)
  341 
  342 #define DECLARE_GEOM_CLASS(class, name)                         \
  343         static moduledata_t name##_mod = {                      \
  344                 #name, g_modevent, &class                       \
  345         };                                                      \
  346         DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
  347 
  348 #endif /* _KERNEL */
  349 
  350 /* geom_ctl.c */
  351 int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len);
  352 void gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr, int len);
  353 void *gctl_get_param(struct gctl_req *req, const char *param, int *len);
  354 char const *gctl_get_asciiparam(struct gctl_req *req, const char *param);
  355 void *gctl_get_paraml(struct gctl_req *req, const char *param, int len);
  356 int gctl_error(struct gctl_req *req, const char *fmt, ...) __printflike(2, 3);
  357 struct g_class *gctl_get_class(struct gctl_req *req, char const *arg);
  358 struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg);
  359 struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg);
  360 
  361 #endif /* _GEOM_GEOM_H_ */

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