FreeBSD/Linux Kernel Cross Reference
sys/geom/geom.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 2002 Poul-Henning Kamp
      * Copyright (c) 2002 Networks Associates Technology, Inc.
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project by Poul-Henning Kamp
      * and NAI Labs, the Security Research Division of Network Associates, Inc.
     * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
     * DARPA CHATS research program.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The names of the authors may not be used to endorse or promote
     *    products derived from this software without specific prior written
     *    permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _GEOM_GEOM_H_
    #define _GEOM_GEOM_H_
    
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/sx.h>
    #include <sys/queue.h>
    #include <sys/ioccom.h>
    #include <sys/conf.h>
    #include <sys/module.h>
    
    struct g_class;
    struct g_geom;
    struct g_consumer;
    struct g_provider;
    struct g_stat;
    struct thread;
    struct bio;
    struct sbuf;
    struct gctl_req;
    struct g_configargs;
    struct disk_zone_args;
    
    typedef int g_config_t (struct g_configargs *ca);
    typedef void g_ctl_req_t (struct gctl_req *, struct g_class *cp, char const *verb);
    typedef int g_ctl_create_geom_t (struct gctl_req *, struct g_class *cp, struct g_provider *pp);
    typedef int g_ctl_destroy_geom_t (struct gctl_req *, struct g_class *cp, struct g_geom *gp);
    typedef int g_ctl_config_geom_t (struct gctl_req *, struct g_geom *gp, const char *verb);
    typedef void g_init_t (struct g_class *mp);
    typedef void g_fini_t (struct g_class *mp);
    typedef struct g_geom * g_taste_t (struct g_class *, struct g_provider *, int flags);
    typedef int g_ioctl_t(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td);
    #define G_TF_NORMAL             0
    #define G_TF_INSIST             1
    #define G_TF_TRANSPARENT        2
    typedef int g_access_t (struct g_provider *, int, int, int);
    /* XXX: not sure about the thread arg */
    typedef void g_orphan_t (struct g_consumer *);
    
    typedef void g_start_t (struct bio *);
    typedef void g_spoiled_t (struct g_consumer *);
    typedef void g_attrchanged_t (struct g_consumer *, const char *attr);
    typedef void g_provgone_t (struct g_provider *);
    typedef void g_dumpconf_t (struct sbuf *, const char *indent, struct g_geom *,
        struct g_consumer *, struct g_provider *);
    typedef void g_resize_t(struct g_consumer *cp);
    
    /*
     * The g_class structure describes a transformation class.  In other words
     * all BSD disklabel handlers share one g_class, all MBR handlers share
     * one common g_class and so on.
     * Certain operations are instantiated on the class, most notably the
     * taste and config_geom functions.
     */
    struct g_class {
            const char              *name;
            u_int                   version;
            u_int                   spare0;
            g_taste_t               *taste;
            g_config_t              *config;
           g_ctl_req_t             *ctlreq;
           g_init_t                *init;
           g_fini_t                *fini;
           g_ctl_destroy_geom_t    *destroy_geom;
           /*
            * Default values for geom methods
            */
           g_start_t               *start;
           g_spoiled_t             *spoiled;
           g_attrchanged_t         *attrchanged;
           g_dumpconf_t            *dumpconf;
           g_access_t              *access;
           g_orphan_t              *orphan;
           g_ioctl_t               *ioctl;
           g_provgone_t            *providergone;
           g_resize_t              *resize;
           void                    *spare1;
           void                    *spare2;
           /*
            * The remaining elements are private
            */
           LIST_ENTRY(g_class)     class;
           LIST_HEAD(,g_geom)      geom;
   };
   
   /*
    * The g_geom_alias is a list node for aliases for the geom name
    * for device node creation.
    */
   struct g_geom_alias {
           LIST_ENTRY(g_geom_alias) ga_next;
           const char              *ga_alias;
   };
   
   #define G_VERSION_00    0x19950323
   #define G_VERSION_01    0x20041207      /* add fflag to g_ioctl_t */
   #define G_VERSION       G_VERSION_01
   
   /*
    * The g_geom is an instance of a g_class.
    */
   struct g_geom {
           char                    *name;
           struct g_class          *class;
           LIST_ENTRY(g_geom)      geom;
           LIST_HEAD(,g_consumer)  consumer;
           LIST_HEAD(,g_provider)  provider;
           TAILQ_ENTRY(g_geom)     geoms;  /* XXX: better name */
           int                     rank;
           g_start_t               *start;
           g_spoiled_t             *spoiled;
           g_attrchanged_t         *attrchanged;
           g_dumpconf_t            *dumpconf;
           g_access_t              *access;
           g_orphan_t              *orphan;
           g_ioctl_t               *ioctl;
           g_provgone_t            *providergone;
           g_resize_t              *resize;
           void                    *spare0;
           void                    *spare1;
           void                    *softc;
           unsigned                flags;
   #define G_GEOM_WITHER           0x01
   #define G_GEOM_VOLATILE_BIO     0x02
   #define G_GEOM_IN_ACCESS        0x04
   #define G_GEOM_ACCESS_WAIT      0x08
           LIST_HEAD(,g_geom_alias) aliases;
   };
   
   /*
    * The g_bioq is a queue of struct bio's.
    * XXX: possibly collection point for statistics.
    * XXX: should (possibly) be collapsed with sys/bio.h::bio_queue_head.
    */
   struct g_bioq {
           TAILQ_HEAD(, bio)       bio_queue;
           struct mtx              bio_queue_lock;
           int                     bio_queue_length;
   };
   
   /*
    * A g_consumer is an attachment point for a g_provider.  One g_consumer
    * can only be attached to one g_provider, but multiple g_consumers
    * can be attached to one g_provider.
    */
   
   struct g_consumer {
           struct g_geom           *geom;
           LIST_ENTRY(g_consumer)  consumer;
           struct g_provider       *provider;
           LIST_ENTRY(g_consumer)  consumers;      /* XXX: better name */
           int                     acr, acw, ace;
           int                     flags;
   #define G_CF_SPOILED            0x1
   #define G_CF_ORPHAN             0x4
   #define G_CF_DIRECT_SEND        0x10
   #define G_CF_DIRECT_RECEIVE     0x20
           struct devstat          *stat;
           u_int                   nstart, nend;
   
           /* Two fields for the implementing class to use */
           void                    *private;
           u_int                   index;
   };
   
   /*
    * A g_provider is a "logical disk".
    */
   struct g_provider {
           char                    *name;
           LIST_ENTRY(g_provider)  provider;
           struct g_geom           *geom;
           LIST_HEAD(,g_consumer)  consumers;
           int                     acr, acw, ace;
           int                     error;
           TAILQ_ENTRY(g_provider) orphan;
           off_t                   mediasize;
           u_int                   sectorsize;
           u_int                   stripesize;
           u_int                   stripeoffset;
           struct devstat          *stat;
           u_int                   nstart, nend;
           u_int                   flags;
   #define G_PF_WITHER             0x2
   #define G_PF_ORPHAN             0x4
   #define G_PF_ACCEPT_UNMAPPED    0x8
   #define G_PF_DIRECT_SEND        0x10
   #define G_PF_DIRECT_RECEIVE     0x20
   
           /* Two fields for the implementing class to use */
           void                    *private;
           u_int                   index;
   };
   
   /*
    * Descriptor of a classifier. We can register a function and
    * an argument, which is called by g_io_request() on bio's
    * that are not previously classified.
    */
   struct g_classifier_hook {
           TAILQ_ENTRY(g_classifier_hook) link;
           int                     (*func)(void *arg, struct bio *bp);
           void                    *arg;
   };
   
   /* BIO_GETATTR("GEOM::setstate") argument values. */
   #define G_STATE_FAILED          0
   #define G_STATE_REBUILD         1
   #define G_STATE_RESYNC          2
   #define G_STATE_ACTIVE          3
   
   /* geom_dev.c */
   struct cdev;
   void g_dev_print(void);
   void g_dev_physpath_changed(void);
   struct g_provider *g_dev_getprovider(struct cdev *dev);
   
   /* geom_dump.c */
   void (g_trace)(int level, const char *, ...) __printflike(2, 3);
   #define G_T_TOPOLOGY            0x01
   #define G_T_BIO                 0x02
   #define G_T_ACCESS              0x04
   extern int g_debugflags;
   #define G_F_FOOTSHOOTING        0x10
   #define G_F_DISKIOCTL           0x40
   #define G_F_CTLDUMP             0x80
   #define g_trace(level, fmt, ...) do {                           \
           if (__predict_false(g_debugflags & (level)))            \
                   (g_trace)(level, fmt, ## __VA_ARGS__);          \
   } while (0)
   
   /* geom_event.c */
   typedef void g_event_t(void *, int flag);
   #define EV_CANCEL       1
   int g_post_event(g_event_t *func, void *arg, int flag, ...);
   int g_waitfor_event(g_event_t *func, void *arg, int flag, ...);
   void g_cancel_event(void *ref);
   int g_attr_changed(struct g_provider *pp, const char *attr, int flag);
   int g_media_changed(struct g_provider *pp, int flag);
   int g_media_gone(struct g_provider *pp, int flag);
   void g_orphan_provider(struct g_provider *pp, int error);
   void g_waitidlelock(void);
   
   /* geom_subr.c */
   int g_access(struct g_consumer *cp, int nread, int nwrite, int nexcl);
   int g_attach(struct g_consumer *cp, struct g_provider *pp);
   int g_compare_names(const char *namea, const char *nameb);
   void g_destroy_consumer(struct g_consumer *cp);
   void g_destroy_geom(struct g_geom *pp);
   void g_destroy_provider(struct g_provider *pp);
   void g_detach(struct g_consumer *cp);
   void g_error_provider(struct g_provider *pp, int error);
   struct g_provider *g_provider_by_name(char const *arg);
   void g_geom_add_alias(struct g_geom *gp, const char *alias);
   int g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len);
   #define g_getattr(a, c, v) g_getattr__((a), (c), (v), sizeof *(v))
   int g_handleattr(struct bio *bp, const char *attribute, const void *val,
       int len);
   int g_handleattr_int(struct bio *bp, const char *attribute, int val);
   int g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val);
   int g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val);
   int g_handleattr_str(struct bio *bp, const char *attribute, const char *str);
   struct g_consumer * g_new_consumer(struct g_geom *gp);
   struct g_geom * g_new_geomf(struct g_class *mp, const char *fmt, ...)
       __printflike(2, 3);
   struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...)
       __printflike(2, 3);
   void g_resize_provider(struct g_provider *pp, off_t size);
   int g_retaste(struct g_class *mp);
   void g_spoil(struct g_provider *pp, struct g_consumer *cp);
   int g_std_access(struct g_provider *pp, int dr, int dw, int de);
   void g_std_done(struct bio *bp);
   void g_std_spoiled(struct g_consumer *cp);
   void g_wither_geom(struct g_geom *gp, int error);
   void g_wither_geom_close(struct g_geom *gp, int error);
   void g_wither_provider(struct g_provider *pp, int error);
   
   #if defined(DIAGNOSTIC) || defined(DDB)
   int g_valid_obj(void const *ptr);
   #endif
   #ifdef DIAGNOSTIC
   #define G_VALID_CLASS(foo) \
       KASSERT(g_valid_obj(foo) == 1, ("%p is not a g_class", foo))
   #define G_VALID_GEOM(foo) \
       KASSERT(g_valid_obj(foo) == 2, ("%p is not a g_geom", foo))
   #define G_VALID_CONSUMER(foo) \
       KASSERT(g_valid_obj(foo) == 3, ("%p is not a g_consumer", foo))
   #define G_VALID_PROVIDER(foo) \
       KASSERT(g_valid_obj(foo) == 4, ("%p is not a g_provider", foo))
   #else
   #define G_VALID_CLASS(foo) do { } while (0)
   #define G_VALID_GEOM(foo) do { } while (0)
   #define G_VALID_CONSUMER(foo) do { } while (0)
   #define G_VALID_PROVIDER(foo) do { } while (0)
   #endif
   
   int g_modevent(module_t, int, void *);
   
   /* geom_io.c */
   struct bio * g_clone_bio(struct bio *);
   struct bio * g_duplicate_bio(struct bio *);
   void g_destroy_bio(struct bio *);
   void g_io_deliver(struct bio *bp, int error);
   int g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr);
   int g_io_zonecmd(struct disk_zone_args *zone_args, struct g_consumer *cp);
   int g_io_flush(struct g_consumer *cp);
   int g_register_classifier(struct g_classifier_hook *hook);
   void g_unregister_classifier(struct g_classifier_hook *hook);
   void g_io_request(struct bio *bp, struct g_consumer *cp);
   struct bio *g_new_bio(void);
   struct bio *g_alloc_bio(void);
   void g_reset_bio(struct bio *);
   void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error);
   int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length);
   int g_delete_data(struct g_consumer *cp, off_t offset, off_t length);
   void g_print_bio(struct bio *bp);
   int g_use_g_read_data(void *, off_t, void **, int);
   int g_use_g_write_data(void *, off_t, void *, int);
   
   /* geom_kern.c / geom_kernsim.c */
   
   #ifdef _KERNEL
   
   extern struct sx topology_lock;
   
   struct g_kerneldump {
           off_t           offset;
           off_t           length;
           struct dumperinfo di;
   };
   
   MALLOC_DECLARE(M_GEOM);
   
   static __inline void *
   g_malloc(int size, int flags)
   {
           void *p;
   
           p = malloc(size, M_GEOM, flags);
           return (p);
   }
   
   static __inline void
   g_free(void *ptr)
   {
   
   #ifdef DIAGNOSTIC
           if (sx_xlocked(&topology_lock)) {
                   KASSERT(g_valid_obj(ptr) == 0,
                       ("g_free(%p) of live object, type %d", ptr,
                       g_valid_obj(ptr)));
           }
   #endif
           free(ptr, M_GEOM);
   }
   
   #define g_topology_lock()                                       \
           do {                                                    \
                   sx_xlock(&topology_lock);                       \
           } while (0)
   
   #define g_topology_try_lock()   sx_try_xlock(&topology_lock)
   
   #define g_topology_unlock()                                     \
           do {                                                    \
                   sx_xunlock(&topology_lock);                     \
           } while (0)
   
   #define g_topology_assert()                                     \
           do {                                                    \
                   sx_assert(&topology_lock, SX_XLOCKED);          \
           } while (0)
   
   #define g_topology_assert_not()                                 \
           do {                                                    \
                   sx_assert(&topology_lock, SX_UNLOCKED);         \
           } while (0)
   
   #define g_topology_sleep(chan, timo)                            \
           sx_sleep(chan, &topology_lock, 0, "gtopol", timo)
   
   #define DECLARE_GEOM_CLASS(class, name)                         \
           static moduledata_t name##_mod = {                      \
                   #name, g_modevent, &class                       \
           };                                                      \
           DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
   
   int g_is_geom_thread(struct thread *td);
   
   #endif /* _KERNEL */
   
   /* geom_ctl.c */
   int gctl_set_param(struct gctl_req *req, const char *param, void const *ptr, int len);
   void gctl_set_param_err(struct gctl_req *req, const char *param, void const *ptr, int len);
   void *gctl_get_param(struct gctl_req *req, const char *param, int *len);
   char const *gctl_get_asciiparam(struct gctl_req *req, const char *param);
   void *gctl_get_paraml(struct gctl_req *req, const char *param, int len);
   int gctl_error(struct gctl_req *req, const char *fmt, ...) __printflike(2, 3);
   struct g_class *gctl_get_class(struct gctl_req *req, char const *arg);
   struct g_geom *gctl_get_geom(struct gctl_req *req, struct g_class *mpr, char const *arg);
   struct g_provider *gctl_get_provider(struct gctl_req *req, char const *arg);
   
   #endif /* _GEOM_GEOM_H_ */

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