Current Path : /usr/include/sys/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //usr/include/sys/bufobj.h |
/*- * 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: release/9.1.0/sys/sys/bufobj.h 183754 2008-10-10 21:23:50Z attilio $ */ /* * 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 be 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> #include <sys/_lock.h> #include <sys/_mutex.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); typedef void b_bdflush_t(struct bufobj *, struct buf *); struct buf_ops { char *bop_name; b_write_t *bop_write; b_strategy_t *bop_strategy; b_sync_t *bop_sync; b_bdflush_t *bop_bdflush; }; #define BO_STRATEGY(bo, bp) ((bo)->bo_ops->bop_strategy((bo), (bp))) #define BO_SYNC(bo, w) ((bo)->bo_ops->bop_sync((bo), (w))) #define BO_WRITE(bo, bp) ((bo)->bo_ops->bop_write((bp))) #define BO_BDFLUSH(bo, bp) ((bo)->bo_ops->bop_bdflush((bo), (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_NEEDSGIANT (1 << 2) /* Require giant for child buffers. */ #define BO_MTX(bo) (&(bo)->bo_mtx) #define BO_LOCK(bo) mtx_lock(BO_MTX((bo))) #define BO_UNLOCK(bo) mtx_unlock(BO_MTX((bo))) #define ASSERT_BO_LOCKED(bo) mtx_assert(BO_MTX((bo)), MA_OWNED) #define ASSERT_BO_UNLOCKED(bo) mtx_assert(BO_MTX((bo)), MA_NOTOWNED) void bufobj_wdrop(struct bufobj *bo); void bufobj_wref(struct bufobj *bo); void bufobj_wrefl(struct bufobj *bo); int bufobj_invalbuf(struct bufobj *bo, int flags, int slpflag, int slptimeo); int bufobj_wwait(struct bufobj *bo, int slpflag, int timeo); int bufsync(struct bufobj *bo, int waitfor); void bufbdflush(struct bufobj *bo, struct buf *bp); #endif /* defined(_KERNEL) || defined(_KVM_VNODE) */ #endif /* _SYS_BUFOBJ_H_ */