OpenAFS Master Repository branch, master, updated. openafs-devel-1_5_66-59-g5e99d56

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit 5e99d56cf2a8c4c9789bc7ace04a804d07e6238f
Author: Simon Wilkinson <sxw@inf.ed.ac.uk>
Date:   Wed Oct 21 23:17:15 2009 +0100

    Use set_page_writeback and end_page_writeback
    
    Calling set_page_writeback and end_page_writeback is necessary to
    ensure that the dirty page radix tree and the page dirty flags
    tally. The results of end_page_writeback are also used by the
    bdi code to prioritise writeback. The Linux kernel
    documentation contains further warnings of doom for what may
    happen due to not calling them.
    
    Adding set_page_writeback and end_page_writeback also allows us to
    unlock the page earlier (the page can be locked any time after the
    writeback flag is set). This means that we're not calling the
    backing filesystem's ->write function with our pages locked, and
    should help reduce contention and the potential for deadlocks there.
    
    Change-Id: I9130b2ad9a09c6b9b16a0f63d7b4a614a93de8d3
    Reviewed-on: http://gerrit.openafs.org/819
    Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
    Tested-by: Marc Dionne <marc.c.dionne@gmail.com>
    Reviewed-by: Derrick Brashear <shadow@dementia.org>

 src/afs/LINUX/osi_vnodeops.c |   27 +++++++++++++++++++--------
 1 files changed, 19 insertions(+), 8 deletions(-)

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