133 lines
4.4 KiB
C
133 lines
4.4 KiB
C
/*-
|
|
* Copyright (c) 2004 Poul-Henning Kamp
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Architectural notes:
|
|
*
|
|
* bufobj is a new object which is what buffers hang from in the buffer
|
|
* cache.
|
|
*
|
|
* This used to be vnodes, but we need non-vnode code to be able
|
|
* to use the buffer cache as well, specifically geom classes like gbde,
|
|
* raid3 and raid5.
|
|
*
|
|
* All vnodes will contain a bufobj initially, but down the road we may
|
|
* want to only allocate bufobjs when they are needed. There could be a
|
|
* large number of vnodes in the system which wouldn't need a bufobj during
|
|
* their lifetime.
|
|
*
|
|
* The exact relationship to the vmobject is not determined at this point,
|
|
* it may in fact bee that we find them to be two sides of the same object
|
|
* once things starts to crystalize.
|
|
*/
|
|
|
|
#ifndef _SYS_BUFOBJ_H_
|
|
#define _SYS_BUFOBJ_H_
|
|
|
|
#if defined(_KERNEL) || defined(_KVM_VNODE)
|
|
|
|
#include <sys/queue.h>
|
|
|
|
struct bufobj;
|
|
struct buf_ops;
|
|
|
|
extern struct buf_ops buf_ops_bio;
|
|
|
|
TAILQ_HEAD(buflists, buf);
|
|
|
|
/* A Buffer splay list */
|
|
struct bufv {
|
|
struct buflists bv_hd; /* Sorted blocklist */
|
|
struct buf *bv_root; /* Buf splay tree */
|
|
int bv_cnt; /* Number of buffers */
|
|
};
|
|
|
|
typedef void b_strategy_t(struct bufobj *, struct buf *);
|
|
typedef int b_write_t(struct buf *);
|
|
typedef int b_sync_t(struct bufobj *, int waitfor, struct thread *td);
|
|
|
|
struct buf_ops {
|
|
char *bop_name;
|
|
b_write_t *bop_write;
|
|
b_strategy_t *bop_strategy;
|
|
b_sync_t *bop_sync;
|
|
};
|
|
|
|
#define BO_STRATEGY(bo, bp) ((bo)->bo_ops->bop_strategy((bo), (bp)))
|
|
#define BO_SYNC(bo, w, td) ((bo)->bo_ops->bop_sync((bo), (w), (td)))
|
|
#define BO_WRITE(bo, bp) ((bo)->bo_ops->bop_write((bp)))
|
|
|
|
struct bufobj {
|
|
struct mtx *bo_mtx; /* Mutex which protects "i" things */
|
|
struct bufv bo_clean; /* i Clean buffers */
|
|
struct bufv bo_dirty; /* i Dirty buffers */
|
|
long bo_numoutput; /* i Writes in progress */
|
|
u_int bo_flag; /* i Flags */
|
|
struct buf_ops *bo_ops; /* - Buffer operations */
|
|
int bo_bsize; /* - Block size for i/o */
|
|
struct vm_object *bo_object; /* v Place to store VM object */
|
|
LIST_ENTRY(bufobj) bo_synclist; /* S dirty vnode list */
|
|
void *bo_private; /* private pointer */
|
|
struct vnode *__bo_vnode; /*
|
|
* XXX: This vnode pointer is here
|
|
* XXX: only to keep the syncer working
|
|
* XXX: for now.
|
|
*/
|
|
};
|
|
|
|
/*
|
|
* XXX BO_ONWORKLST could be replaced with a check for NULL list elements
|
|
* in v_synclist.
|
|
*/
|
|
#define BO_ONWORKLST (1 << 0) /* On syncer work-list */
|
|
#define BO_WWAIT (1 << 1) /* Wait for output to complete */
|
|
|
|
#define BO_LOCK(bo) \
|
|
do { \
|
|
KASSERT (bo->bo_mtx != NULL, ("No lock in bufobj")); \
|
|
mtx_lock((bo)->bo_mtx); \
|
|
} while (0)
|
|
|
|
#define BO_UNLOCK(bo) \
|
|
do { \
|
|
KASSERT (bo->bo_mtx != NULL, ("No lock in bufobj")); \
|
|
mtx_unlock((bo)->bo_mtx); \
|
|
} while (0)
|
|
|
|
#define BO_MTX(bo) ((bo)->bo_mtx)
|
|
#define ASSERT_BO_LOCKED(bo) mtx_assert(bo->bo_mtx, MA_OWNED)
|
|
#define ASSERT_BO_UNLOCKED(bo) mtx_assert(bo->bo_mtx, MA_NOTOWNED)
|
|
|
|
void bufobj_wdrop(struct bufobj *bo);
|
|
void bufobj_wref(struct bufobj *bo);
|
|
int bufobj_wwait(struct bufobj *bo, int slpflag, int timeo);
|
|
int bufsync(struct bufobj *bo, int waitfor, struct thread *td);
|
|
|
|
#endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
|
|
#endif /* _SYS_BUFOBJ_H_ */
|