From: Chris Mason <chris.mason@oracle.com>
Date: Fri, 19 Oct 2007 14:39:41 +0000 (-0400)
Subject: Btrfs: Avoid recursive KM_USER1 mappings in copy_extent_buffer
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ff190c0c004d8e51195c7bcf5a8490aeefccbce0;p=openwrt%2Fstaging%2Fblogic.git

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 caaf0bf0e059..a61379230dd2 100644
--- 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;