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[XFS updates] XFS development tree branch, master, updated. v2.6.28-rc3-

To: xfs@xxxxxxxxxxx
Subject: [XFS updates] XFS development tree branch, master, updated. v2.6.28-rc3-20852-g6321e3e
From: xfs@xxxxxxxxxxx
Date: Wed, 29 Apr 2009 13:26:07 -0500
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The branch, master has been updated
  6321e3e xfs: fix getbmap vs mmap deadlock
      from  4be4a00fb55879ef44b5914c189aecffa828deb4 (commit)

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- Log -----------------------------------------------------------------
commit 6321e3ed2acf3ee9643cdd403e1c88605d7944ba
Author: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date:   Tue Feb 24 08:39:02 2009 -0500

    xfs: fix getbmap vs mmap deadlock
    
    xfs_getbmap (or rather the formatters called by it) copy out the getbmap
    structures under the ilock, which can deadlock against mmap.  This has
    been reported via bugzilla a while ago (#717) and has recently also
    shown up via lockdep.
    
    So allocate a temporary buffer to format the kernel getbmap structures
    into and then copy them out after dropping the locks.
    
    A little problem with this is that we limit the number of extents we
    can copy out by the maximum allocation size, but I see no real way
    around that.
    
    Signed-off-by: Christoph Hellwig <hch@xxxxxx>
    Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxxx>
    Reviewed-by: Felix Blyakher <felixb@xxxxxxx>
    Signed-off-by: Felix Blyakher <felixb@xxxxxxx>

-----------------------------------------------------------------------

Summary of changes:
 fs/xfs/xfs_bmap.c |   52 +++++++++++++++++++++++++++++++++++-----------------
 1 files changed, 35 insertions(+), 17 deletions(-)


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