tree dad92ff6ea5cba470d93664b9ea195ecab66b07b
parent 663350ac38c67ca388acea6e876dc6d668c232b0
author Chris Mason <chris.mason@oracle.com> 1320424177 -0400
committer Chris Mason <chris.mason@oracle.com> 1320566660 -0500

Btrfs: ClearPageError during writepage and clean_tree_block

Failure testing was tripping up over stale PageError bits in
metadata pages.  If we have an io error on a block, and later on
end up reusing it, nobody ever clears PageError on those pages.

During commit, we'll find PageError and think we had trouble writing
the block, which will lead to aborts and other problems.

This changes clean_tree_block and the btrfs writepage code to
clear the PageError bit.  In both cases we're either completely
done with the page or the page has good stuff and the error bit
is no longer valid.

Signed-off-by: Chris Mason <chris.mason@oracle.com>