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| Current File : //sys/geom/geom.h |
/*-
* 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: release/9.1.0/sys/geom/geom.h 237873 2012-07-01 05:13:50Z ken $
*/
#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;
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 *);
/*
* 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;
void *spare2;
/*
* The remaining elements are private
*/
LIST_ENTRY(g_class) class;
LIST_HEAD(,g_geom) geom;
};
#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;
void *spare1;
void *softc;
unsigned flags;
#define G_GEOM_WITHER 1
#define G_GEOM_VOLATILE_BIO 2
};
/*
* 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 spoiled;
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_CANDELETE 0x1
#define G_PF_WITHER 0x2
#define G_PF_ORPHAN 0x4
/* 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 *, ...);
# define G_T_TOPOLOGY 1
# define G_T_BIO 2
# define G_T_ACCESS 4
/* 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);
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);
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_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, ...);
struct g_provider * g_new_providerf(struct g_geom *gp, const char *fmt, ...);
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_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_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);
/* 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 { \
mtx_assert(&Giant, MA_NOTOWNED); \
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_FIRST);
#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_ */