libceph: reference counting pagelist
this allow pagelist to present data that may be sent multiple times.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
diff --git a/include/linux/ceph/pagelist.h b/include/linux/ceph/pagelist.h
index 9660d6b..5f871d8 100644
--- a/include/linux/ceph/pagelist.h
+++ b/include/linux/ceph/pagelist.h
@@ -2,6 +2,7 @@
#define __FS_CEPH_PAGELIST_H
#include <linux/list.h>
+#include <linux/atomic.h>
struct ceph_pagelist {
struct list_head head;
@@ -10,6 +11,7 @@
size_t room;
struct list_head free_list;
size_t num_pages_free;
+ atomic_t refcnt;
};
struct ceph_pagelist_cursor {
@@ -26,9 +28,10 @@
pl->room = 0;
INIT_LIST_HEAD(&pl->free_list);
pl->num_pages_free = 0;
+ atomic_set(&pl->refcnt, 1);
}
-extern int ceph_pagelist_release(struct ceph_pagelist *pl);
+extern void ceph_pagelist_release(struct ceph_pagelist *pl);
extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);