ceph: add pagelist_reserve, pagelist_truncate, pagelist_set_cursor

[net-next-2.6.git] / include / linux / ceph / pagelist.h

diff --git a/include/linux/ceph/pagelist.h b/include/linux/ceph/pagelist.h
index cc9327aa1c98ff8131bc9df9965537643b854212..9660d6b0a35d780dbe0806edf6193d1f7d5ef8f5 100644 (file)
--- a/include/linux/ceph/pagelist.h
+++ b/include/linux/ceph/pagelist.h
@@ -8,6 +8,14 @@ struct ceph_pagelist {
        void *mapped_tail;
        size_t length;
        size_t room;
+       struct list_head free_list;
+       size_t num_pages_free;
+};
+
+struct ceph_pagelist_cursor {
+       struct ceph_pagelist *pl;   /* pagelist, for error checking */
+       struct list_head *page_lru; /* page in list */
+       size_t room;                /* room remaining to reset to */
 };
 
 static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
@@ -16,11 +24,24 @@ static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
        pl->mapped_tail = NULL;
        pl->length = 0;
        pl->room = 0;
+       INIT_LIST_HEAD(&pl->free_list);
+       pl->num_pages_free = 0;
 }
+
 extern int ceph_pagelist_release(struct ceph_pagelist *pl);
 
 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
 
+extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
+
+extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
+
+extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
+                                    struct ceph_pagelist_cursor *c);
+
+extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
+                                 struct ceph_pagelist_cursor *c);
+
 static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
 {
        __le64 ev = cpu_to_le64(v);