Btrfs: Only limit btree writeback for pdflush

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

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 28e9ef8..8a74f90 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -210,7 +210,7 @@ static int btree_writepages(struct address_space *mapping,
 {
        struct extent_map_tree *tree;
        tree = &BTRFS_I(mapping->host)->extent_tree;
-       if (wbc->sync_mode == WB_SYNC_NONE) {
+       if (wbc->sync_mode == WB_SYNC_NONE && current_is_pdflush()) {
                u64 num_dirty;
                u64 start = 0;
                unsigned long thresh = 96 * 1024 * 1024;