The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/bufobj.h

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    1 /*-
    2  * Copyright (c) 2004 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: src/sys/sys/bufobj.h,v 1.15 2005/06/10 23:50:41 green Exp $
   27  */
   28 
   29 /*
   30  * Architectural notes:
   31  *
   32  * bufobj is a new object which is what buffers hang from in the buffer
   33  * cache.
   34  *
   35  * This used to be vnodes, but we need non-vnode code to be able
   36  * to use the buffer cache as well, specifically geom classes like gbde,
   37  * raid3 and raid5.
   38  *
   39  * All vnodes will contain a bufobj initially, but down the road we may
   40  * want to only allocate bufobjs when they are needed.  There could be a
   41  * large number of vnodes in the system which wouldn't need a bufobj during
   42  * their lifetime.
   43  *
   44  * The exact relationship to the vmobject is not determined at this point,
   45  * it may in fact bee that we find them to be two sides of the same object 
   46  * once things starts to crystalize.
   47  */
   48 
   49 #ifndef _SYS_BUFOBJ_H_
   50 #define _SYS_BUFOBJ_H_
   51 
   52 #if defined(_KERNEL) || defined(_KVM_VNODE)
   53 
   54 #include <sys/queue.h>
   55 
   56 struct bufobj;
   57 struct buf_ops;
   58 
   59 extern struct buf_ops buf_ops_bio;
   60 
   61 TAILQ_HEAD(buflists, buf);
   62 
   63 /* A Buffer splay list */
   64 struct bufv {
   65         struct buflists bv_hd;          /* Sorted blocklist */
   66         struct buf      *bv_root;       /* Buf splay tree */
   67         int             bv_cnt;         /* Number of buffers */
   68 };
   69 
   70 typedef void b_strategy_t(struct bufobj *, struct buf *);
   71 typedef int b_write_t(struct buf *);
   72 typedef int b_sync_t(struct bufobj *, int waitfor, struct thread *td);
   73 
   74 struct buf_ops {
   75         char            *bop_name;
   76         b_write_t       *bop_write;
   77         b_strategy_t    *bop_strategy;
   78         b_sync_t        *bop_sync;
   79 };
   80 
   81 #define BO_STRATEGY(bo, bp)     ((bo)->bo_ops->bop_strategy((bo), (bp)))
   82 #define BO_SYNC(bo, w, td)      ((bo)->bo_ops->bop_sync((bo), (w), (td)))
   83 #define BO_WRITE(bo, bp)        ((bo)->bo_ops->bop_write((bp)))
   84 
   85 struct bufobj {
   86         struct mtx      *bo_mtx;        /* Mutex which protects "i" things */
   87         struct bufv     bo_clean;       /* i Clean buffers */
   88         struct bufv     bo_dirty;       /* i Dirty buffers */
   89         long            bo_numoutput;   /* i Writes in progress */
   90         u_int           bo_flag;        /* i Flags */
   91         struct buf_ops  *bo_ops;        /* - Buffer operations */
   92         int             bo_bsize;       /* - Block size for i/o */
   93         struct vm_object *bo_object;    /* v Place to store VM object */
   94         LIST_ENTRY(bufobj) bo_synclist; /* S dirty vnode list */
   95         void            *bo_private;    /* private pointer */
   96         struct vnode    *__bo_vnode;    /*
   97                                          * XXX: This vnode pointer is here
   98                                          * XXX: only to keep the syncer working
   99                                          * XXX: for now.
  100                                          */
  101 };
  102 
  103 /*
  104  * XXX BO_ONWORKLST could be replaced with a check for NULL list elements
  105  * in v_synclist.
  106  */
  107 #define BO_ONWORKLST    (1 << 0)        /* On syncer work-list */
  108 #define BO_WWAIT        (1 << 1)        /* Wait for output to complete */
  109 
  110 #define BO_LOCK(bo) \
  111         do { \
  112                 KASSERT((bo)->bo_mtx != NULL, ("No lock in bufobj")); \
  113                 mtx_lock((bo)->bo_mtx); \
  114         } while (0)
  115 
  116 #define BO_UNLOCK(bo) \
  117         do { \
  118                 KASSERT((bo)->bo_mtx != NULL, ("No lock in bufobj")); \
  119                 mtx_unlock((bo)->bo_mtx); \
  120         } while (0)
  121 
  122 #define BO_MTX(bo)              ((bo)->bo_mtx)
  123 #define ASSERT_BO_LOCKED(bo)    mtx_assert(bo->bo_mtx, MA_OWNED)
  124 #define ASSERT_BO_UNLOCKED(bo)  mtx_assert(bo->bo_mtx, MA_NOTOWNED)
  125 
  126 void bufobj_wdrop(struct bufobj *bo);
  127 void bufobj_wref(struct bufobj *bo);
  128 void bufobj_wrefl(struct bufobj *bo);
  129 int bufobj_invalbuf(struct bufobj *bo, int flags, struct thread *td, int slpflag, int slptimeo);
  130 int bufobj_wwait(struct bufobj *bo, int slpflag, int timeo);
  131 int bufsync(struct bufobj *bo, int waitfor, struct thread *td);
  132 
  133 #endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
  134 #endif /* _SYS_BUFOBJ_H_ */

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