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e1f355fe4e
At some point later the syncer will unlearn about vnodes and the filesystems method called by the syncer will know enough about what's in bo_private to do the right thing. [1] Ok, I know, but I couldn't resist the pun.
125 lines
4.1 KiB
C
125 lines
4.1 KiB
C
/*-
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* Copyright (c) 2004 Poul-Henning Kamp
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* All rights reserved.
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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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*
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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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/*
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* Architectural notes:
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*
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* bufobj is a new object which is what buffers hang from in the buffer
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* cache.
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*
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* This used to be vnodes, but we need non-vnode code to be able
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* to use the buffer cache as well, specifically geom classes like gbde,
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* raid3 and raid5.
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*
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* All vnodes will contain a bufobj initially, but down the road we may
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* want to only allocate bufobjs when they are needed. There could be a
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* large number of vnodes in the system which wouldn't need a bufobj during
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* their lifetime.
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*
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* The exact relationship to the vmobject is not determined at this point,
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* it may in fact bee that we find them to be two sides of the same object
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* once things starts to crystalize.
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*/
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#ifndef _SYS_BUFOBJ_H_
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#define _SYS_BUFOBJ_H_
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#if defined(_KERNEL) || defined(_KVM_VNODE)
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#include <sys/queue.h>
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struct bufobj;
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struct buf_ops;
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extern struct buf_ops buf_ops_bio;
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TAILQ_HEAD(buflists, buf);
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/* A Buffer splay list */
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struct bufv {
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struct buflists bv_hd; /* Sorted blocklist */
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struct buf *bv_root; /* Buf splay tree */
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int bv_cnt; /* Number of buffers */
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};
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typedef void b_strategy_t(struct bufobj *, struct buf *);
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typedef int b_write_t(struct buf *);
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struct buf_ops {
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char *bop_name;
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b_write_t *bop_write;
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b_strategy_t *bop_strategy;
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};
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struct bufobj {
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struct mtx *bo_mtx; /* Mutex which protects "i" things */
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struct bufv bo_clean; /* i Clean buffers */
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struct bufv bo_dirty; /* i Dirty buffers */
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long bo_numoutput; /* i Writes in progress */
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u_int bo_flag; /* i Flags */
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struct buf_ops *bo_ops; /* - Buffer operations */
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int bo_bsize; /* - Block size for i/o */
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struct vm_object *bo_object; /* v Place to store VM object */
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LIST_ENTRY(bufobj) bo_synclist; /* S dirty vnode list */
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void *bo_private; /* private pointer */
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struct vnode *__bo_vnode; /*
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* XXX: This vnode pointer is here
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* XXX: only to keep the syncer working
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* XXX: for now.
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*/
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};
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/*
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* XXX BO_ONWORKLST could be replaced with a check for NULL list elements
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* in v_synclist.
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*/
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#define BO_ONWORKLST (1 << 0) /* On syncer work-list */
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#define BO_WWAIT (1 << 1) /* Wait for output to complete */
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#define BO_LOCK(bo) \
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do { \
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KASSERT (bo->bo_mtx != NULL, ("No lock in bufobj")); \
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mtx_lock((bo)->bo_mtx); \
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} while (0)
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#define BO_UNLOCK(bo) \
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do { \
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KASSERT (bo->bo_mtx != NULL, ("No lock in bufobj")); \
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mtx_unlock((bo)->bo_mtx); \
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} while (0)
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#define BO_MTX(bo) ((bo)->bo_mtx)
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#define ASSERT_BO_LOCKED(bo) mtx_assert(bo->bo_mtx, MA_OWNED)
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#define ASSERT_BO_UNLOCKED(bo) mtx_assert(bo->bo_mtx, MA_NOTOWNED)
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void bufobj_wdrop(struct bufobj *bo);
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void bufobj_wref(struct bufobj *bo);
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int bufobj_wwait(struct bufobj *bo, int slpflag, int timeo);
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#endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
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#endif /* _SYS_BUFOBJ_H_ */
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