btrfs: move leak debug code to functions

Clean up the leak debugging in extent_io.c by moving
the debug code into functions.  This also removes the
list_heads used for debugging from the extent_buffer
and extent_state structures when debug is not enabled.

Since we need a global debug config to do that last
part, implement CONFIG_BTRFS_DEBUG to accommodate.

Thanks to Dave Sterba for the Kconfig bit.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 0f5374c9e368..2b3b83296977 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -63,3 +63,12 @@ config BTRFS_FS_RUN_SANITY_TESTS
 
           If unsure, say N.
 
+config BTRFS_DEBUG
+        bool "Btrfs debugging support"
+        depends on BTRFS_FS
+        help
+          Enable run-time debugging support for the btrfs filesystem. This may
+          enable additional and expensive checks with negative impact on
+          performance, or export extra information via sysfs.
+
+          If unsure, say N.