Btrfs: Change TestSetPageLocked() to trylock_page()

Add backwards compatibility in compat.h

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---
 compat.h    |    3 +++
 extent_io.c |    3 ++-
 2 files changed, 5 insertions(+), 1 deletions(-)

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

2 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index d39a768e65ff..b3349a66999d 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -1,6 +1,9 @@
 #ifndef _COMPAT_H_
 #define _COMPAT_H_
 
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,26)
+#define trylock_page(page) (!TestSetPageLocked(page))
+#endif
 
 /*
  * Even if AppArmor isn't enabled, it still has different prototypes.
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 1cf4baba4342..f46f88620c70 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -14,6 +14,7 @@
 #include <linux/pagevec.h>
 #include "extent_io.h"
 #include "extent_map.h"
+#include "compat.h"
 
 /* temporary define until extent_map moves out of btrfs */
 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
@@ -3055,7 +3056,7 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
         for (i = start_i; i < num_pages; i++) {
                 page = extent_buffer_page(eb, i);
                 if (!wait) {
-                        if (TestSetPageLocked(page))
+                        if (!trylock_page(page))
                                 goto unlock_exit;
                 } else {
                         lock_page(page);