This function checks if a glock holder's locking state is compatible with
another locking state.
Signed-off-by: Andreas Gruenbacher <agrue...@redhat.com>
---
fs/gfs2/glock.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 31a8f2f649b5..f0ef6fd24ba4 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -49,6 +49,20 @@ enum {
#define LM_ST_DEFERRED 2
#define LM_ST_SHARED 3
+static inline bool gfs2_holder_is_compatible(struct gfs2_holder *gh, int
state) {
+ BUG_ON(state == LM_ST_UNLOCKED);
+ switch(gh->gh_state) {
+ case LM_ST_EXCLUSIVE:
+ return state != LM_ST_DEFERRED;
+ case LM_ST_DEFERRED:
+ return state == LM_ST_DEFERRED;
+ case LM_ST_SHARED:
+ return state == LM_ST_SHARED;
+ default:
+ return false;
+ }
+}
+
/*
* lm_lock() flags
*
--
2.26.3
