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From: Matt Dillon <dillon@FreeBSD.org>
Date: Thu, 24 May 2001 00:22:27 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/lib/libc/sys fcntl.2 open.2 src/sys/kern vfs_bio.c
         vfs_cluster.c vfs_vnops.c src/sys/sys buf.h fcntl.h file.h vnode.h
         src/sys/vm vm_page.c vm_page.h src/sys/ufs/ufs ufs_readwrite.c
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dillon      2001/05/24 00:22:27 PDT

  Modified files:
    lib/libc/sys         fcntl.2 open.2 
    sys/kern             vfs_bio.c vfs_cluster.c vfs_vnops.c 
    sys/sys              buf.h fcntl.h file.h vnode.h 
    sys/vm               vm_page.c vm_page.h 
    sys/ufs/ufs          ufs_readwrite.c 
  Log:
  This patch implements O_DIRECT about 80% of the way.  It takes a patchset
  Tor created a while ago, removes the raw I/O piece (that has cache coherency
  problems), and adds a buffer cache / VM freeing piece.
  
  Essentially this patch causes O_DIRECT I/O to not be left in the cache, but
  does not prevent it from going through the cache, hence the 80%.  For
  the last 20% we need a method by which the I/O can be issued directly to
  buffer supplied by the user process and bypass the buffer cache entirely,
  but still maintain cache coherency.
  
  I also have the code working under -stable but the changes made to sys/file.h
  may not be MFCable, so an MFC is not on the table yet.
  
  Submitted by:	tegge, dillon
  
  Revision  Changes    Path
  1.22      +6 -1      src/lib/libc/sys/fcntl.2
  1.15      +8 -1      src/lib/libc/sys/open.2
  1.282     +8 -3      src/sys/kern/vfs_bio.c
  1.110     +10 -1     src/sys/kern/vfs_cluster.c
  1.117     +5 -1      src/sys/kern/vfs_vnops.c
  1.118     +8 -4      src/sys/sys/buf.h
  1.11      +6 -3      src/sys/sys/fcntl.h
  1.29      +3 -2      src/sys/sys/file.h
  1.152     +2 -1      src/sys/sys/vnode.h
  1.164     +24 -1     src/sys/vm/vm_page.c
  1.86      +2 -1      src/sys/vm/vm_page.h
  1.80      +30 -8     src/sys/ufs/ufs/ufs_readwrite.c


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