xfs: handle negative wbc->nr_to_write during sync writeback

During data integrity (WB_SYNC_ALL) writeback, wbc->nr_to_write will
go negative on inodes with more than 1024 dirty pages due to
implementation details of write_cache_pages(). Currently XFS will
abort page clustering in writeback once nr_to_write drops below
zero, and so for data integrity writeback we will do very
inefficient page at a time allocation and IO submission for inodes
with large numbers of dirty pages.

Fix this by only aborting the page clustering code when
wbc->nr_to_write is negative and the sync mode is WB_SYNC_NONE.

Cc: <stable@kernel.org>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 15412fe15c3a47f3cc744af36cecfe2b01e5a5a3..528be1ba1402f31238429931ac64e3822041d4f2 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -852,8 +852,8 @@ xfs_convert_page(
                SetPageUptodate(page);
 
        if (count) {
-               wbc->nr_to_write--;
-               if (wbc->nr_to_write <= 0)
+               if (--wbc->nr_to_write <= 0 &&
+                   wbc->sync_mode == WB_SYNC_NONE)
                        done = 1;
        }
        xfs_start_page_writeback(page, !page_dirty, count);