From owner-cvs-all  Thu Mar 11 18:25:17 1999
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From: Julian Elischer <julian@FreeBSD.org>
Date: Thu, 11 Mar 1999 18:24:59 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/sys buf.h proc.h src/sys/kern vfs_bio.c
         vfs_cluster.c vfs_subr.c src/sys/nfs nfs_bio.c nfs_vnops.c
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julian      1999/03/11 18:24:59 PST

  Modified files:
    sys/sys              buf.h proc.h 
    sys/kern             vfs_bio.c vfs_cluster.c vfs_subr.c 
    sys/nfs              nfs_bio.c nfs_vnops.c 
  Log:
  Reviewed by: Many at differnt times in differnt parts,
  		including alan, john, me, luoqi, and kirk
  Submitted by:	Matt Dillon <dillon@frebsd.org>
  
  This change implements a relatively sophisticated fix to getnewbuf().
  There were two problems with getnewbuf(). First, the writerecursion
  can lead to a system stack overflow when you have NFS and/or VN
  devices in the system. Second, the free/dirty buffer accounting was
  completely broken. Not only did the nfs routines blow it trying to
  manually account for the buffer state, but the accounting that was
  done did not work well with the purpose of their existance: figuring
  out when getnewbuf() needs to sleep.
  
  The meat of the change is to kern/vfs_bio.c. The remaining diffs are
  all minor except for NFS, which includes both the fixes for bp
  interaction AND fixes for a 'biodone(): buffer already done' lockup.
  Sys/buf.h also contains a chaining structure which is not used by
  this patchset but is used by other patches that are coming soon.
  This patch deliniated by tags PRE_MAT_GETBUF and POST_MAT_GETBUF.
  (sorry for the missing T matt)
  
  Revision  Changes    Path
  1.65      +9 -6      src/sys/sys/buf.h
  1.75      +4 -3      src/sys/sys/proc.h
  1.202     +665 -381  src/sys/kern/vfs_bio.c
  1.80      +3 -3      src/sys/kern/vfs_cluster.c
  1.189     +23 -12    src/sys/kern/vfs_subr.c
  1.67      +36 -21    src/sys/nfs/nfs_bio.c
  1.124     +51 -30    src/sys/nfs/nfs_vnops.c


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