fs: dlm: memory cache for midcomms hotpath

This patch will introduce a kmem cache for allocating message handles
which are needed for midcomms layer to take track of lowcomms messages.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 26 insertions, 5 deletions

diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index 5918f4d395869..8996c6453ad5c 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -10,32 +10,44 @@
 ******************************************************************************/
 
 #include "dlm_internal.h"
+#include "midcomms.h"
 #include "config.h"
 #include "memory.h"
 
+static struct kmem_cache *mhandle_cache;
 static struct kmem_cache *lkb_cache;
 static struct kmem_cache *rsb_cache;
 
 
 int __init dlm_memory_init(void)
 {
+	mhandle_cache = dlm_midcomms_cache_create();
+	if (!mhandle_cache)
+		goto out;
+
 	lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
 				__alignof__(struct dlm_lkb), 0, NULL);
 	if (!lkb_cache)
-		return -ENOMEM;
+		goto lkb;
 
 	rsb_cache = kmem_cache_create("dlm_rsb", sizeof(struct dlm_rsb),
 				__alignof__(struct dlm_rsb), 0, NULL);
-	if (!rsb_cache) {
-		kmem_cache_destroy(lkb_cache);
-		return -ENOMEM;
-	}
+	if (!rsb_cache)
+		goto rsb;
 
 	return 0;
+
+rsb:
+	kmem_cache_destroy(lkb_cache);
+lkb:
+	kmem_cache_destroy(mhandle_cache);
+out:
+	return -ENOMEM;
 }
 
 void dlm_memory_exit(void)
 {
+	kmem_cache_destroy(mhandle_cache);
 	kmem_cache_destroy(lkb_cache);
 	kmem_cache_destroy(rsb_cache);
 }
@@ -89,3 +101,12 @@ void dlm_free_lkb(struct dlm_lkb *lkb)
 	kmem_cache_free(lkb_cache, lkb);
 }
 
+struct dlm_mhandle *dlm_allocate_mhandle(void)
+{
+	return kmem_cache_alloc(mhandle_cache, GFP_NOFS);
+}
+
+void dlm_free_mhandle(struct dlm_mhandle *mhandle)
+{
+	kmem_cache_free(mhandle_cache, mhandle);
+}