From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Sat, 15 May 2021 15:15:59 +0000 (+0200)
Subject: gfs2: Add gfs2_holder_is_compatible helper
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=04264450d3cb6f54620b2884fa83882c13d4a8e7;p=users%2Fjedix%2Flinux-maple.git

gfs2: Add gfs2_holder_is_compatible helper

This function checks if a glock holder's locking state is compatible with
another locking state.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---

diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 31a8f2f649b52..f0ef6fd24ba4d 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
  *