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
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -2586,9 +2586,9 @@
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;