]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
mm: write_cache_pages early loop termination
authorNick Piggin <npiggin@suse.de>
Tue, 6 Jan 2009 22:39:06 +0000 (14:39 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 6 Jan 2009 23:58:59 +0000 (15:58 -0800)
commitbd19e012f6fd3b7309689165ea865cbb7bb88c1e
tree66ca4f5bfc683d2935e7fc5cab2f57a7682ad65a
parent31a12666d8f0c22235297e1c1575f82061480029
mm: write_cache_pages early loop termination

We'd like to break out of the loop early in many situations, however the
existing code has been setting mapping->writeback_index past the final
page in the pagevec lookup for cyclic writeback.  This is a problem if we
don't process all pages up to the final page.

Currently the code mostly keeps writeback_index reasonable and hacked
around this by not breaking out of the loop or writing pages outside the
range in these cases.  Keep track of a real "done index" that enables us
to terminate the loop in a much more flexible manner.

Needed by the subsequent patch to preserve writepage errors, and then
further patches to break out of the loop early for other reasons.  However
there are no functional changes with this patch alone.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/page-writeback.c