Btrfs: Avoid recursive KM_USER1 mappings in copy_extent_buffer

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

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index caaf0bf..a613792 100644 (file)
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -2586,9 +2586,9 @@ void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
 
                cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset));
 
-               kaddr = kmap_atomic(page, KM_USER1);
+               kaddr = kmap_atomic(page, KM_USER0);
                read_extent_buffer(src, kaddr + offset, src_offset, cur);
-               kunmap_atomic(kaddr, KM_USER1);
+               kunmap_atomic(kaddr, KM_USER0);
 
                src_offset += cur;
                len -= cur;