ext4: Fix include/trace/events/ext4.h to work with Systemtap
Using relative pathnames in #include statements interacts badly with
SystemTap, since the fs/ext4/*.h header files are not packaged up as
part of a distribution kernel's header files. Since systemtap doesn't
use TP_fast_assign(), we can use a blind structure definition and then
make sure the needed header files are defined before the ext4 source
files #include the trace/events/ext4.h header file.
https://bugzilla.redhat.com/show_bug.cgi?id=512478
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 68b53c7..6fe6ce9 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -5,10 +5,12 @@
#define _TRACE_EXT4_H
#include <linux/writeback.h>
-#include "../../../fs/ext4/ext4.h"
-#include "../../../fs/ext4/mballoc.h"
#include <linux/tracepoint.h>
+struct ext4_allocation_context;
+struct ext4_allocation_request;
+struct ext4_prealloc_space;
+
TRACE_EVENT(ext4_free_inode,
TP_PROTO(struct inode *inode),