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From: Xin LI <delphij@FreeBSD.org>
Date: Sun, 20 Feb 2005 08:02:16 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sbin/fsck_ffs fsck.h pass5.c src/sys/ufs/ffs
 ffs_alloc.c ffs_softdep.c fs.h
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delphij     2005-02-20 08:02:16 UTC

  FreeBSD src repository

  Modified files:
    sbin/fsck_ffs        fsck.h pass5.c 
    sys/ufs/ffs          ffs_alloc.c ffs_softdep.c fs.h 
  Log:
  The recomputation of file system summary at mount time can be a
  very slow process, especially for large file systems that is just
  recovered from a crash.
  
  Since the summary is already re-sync'ed every 30 second, we will
  not lag behind too much after a crash.  With this consideration
  in mind, it is more reasonable to transfer the responsibility to
  background fsck, to reduce the delay after a crash.
  
  Add a new sysctl variable, vfs.ffs.compute_summary_at_mount, to
  control this behavior.  When set to nonzero, we will get the
  "old" behavior, that the summary is computed immediately at mount
  time.
  
  Add five new sysctl variables to adjust ndir, nbfree, nifree,
  nffree and numclusters respectively.  Teach fsck_ffs about these
  API, however, intentionally not to check the existence, since
  kernels without these sysctls must have recomputed the summary
  and hence no adjustments are necessary.
  
  This change has eliminated the usual tens of minutes of delay of
  mounting large dirty volumes.
  
  Reviewed by:    mckusick
  MFC After:      1 week
  
  Revision  Changes    Path
  1.35      +5 -0      src/sbin/fsck_ffs/fsck.h
  1.41      +55 -0     src/sbin/fsck_ffs/pass5.c
  1.132     +68 -1     src/sys/ufs/ffs/ffs_alloc.c
  1.176     +12 -3     src/sys/ufs/ffs/ffs_softdep.c
  1.48      +6 -1      src/sys/ufs/ffs/fs.h