ocfs2: track local alloc state via debugfs
A per-mount debugfs file, "local_alloc" is created which when read will
expose live state of the nodes local alloc file. Performance impact is
minimal, only a bit of memory overhead per mount point. Still, the code is
hidden behind CONFIG_OCFS2_FS_STATS. This feature will help us debug
local alloc performance problems on a live system.
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 4d6e200..1282799 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -272,6 +272,11 @@
u64 la_last_gd;
+#ifdef CONFIG_OCFS2_FS_STATS
+ struct dentry *local_alloc_debug;
+ char *local_alloc_debug_buf;
+#endif
+
/* Next two fields are for local node slot recovery during
* mount. */
int dirty;