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libceph: reference counting pagelist

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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>
This commit is contained in:
Yan, Zheng
2014-09-16 17:50:45 +08:00
committed by Sage Weil
parent 0abb43dcac
commit e4339d28f6
4 changed files with 10 additions and 7 deletions
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include/linux/ceph/pagelist.h
+4 -1
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@@ -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 @@ struct ceph_pagelist {
size_t room;
struct list_head free_list;
size_t num_pages_free;
atomic_t refcnt;
};
struct ceph_pagelist_cursor {
@@ -26,9 +28,10 @@ static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
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);