Commit ff190c0c authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: Avoid recursive KM_USER1 mappings in copy_extent_buffer 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 3685f791

fs/btrfs/extent_map.c

+2 −2
Original line number Diff line number Diff line
@@ -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;