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
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -210,7 +210,7 @@
{
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;