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