fs/ceph/pagelist.h

   1 #ifndef __FS_CEPH_PAGELIST_H
   2 #define __FS_CEPH_PAGELIST_H
   3
   4 #include <linux/list.h>
   5
   6 struct ceph_pagelist {
   7         struct list_head head;
   8         void *mapped_tail;
   9         size_t length;
  10         size_t room;
  11 };
  12
  13 static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
  14 {
  15         INIT_LIST_HEAD(&pl->head);
  16         pl->mapped_tail = NULL;
  17         pl->length = 0;
  18         pl->room = 0;
  19 }
  20 extern int ceph_pagelist_release(struct ceph_pagelist *pl);
  21
  22 extern int ceph_pagelist_append(struct ceph_pagelist *pl, void *d, size_t l);
  23
  24 static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
  25 {
  26         __le64 ev = cpu_to_le64(v);
  27         return ceph_pagelist_append(pl, &ev, sizeof(ev));
  28 }
  29 static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
  30 {
  31         __le32 ev = cpu_to_le32(v);
  32         return ceph_pagelist_append(pl, &ev, sizeof(ev));
  33 }
  34 static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
  35 {
  36         __le16 ev = cpu_to_le16(v);
  37         return ceph_pagelist_append(pl, &ev, sizeof(ev));
  38 }
  39 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
  40 {
  41         return ceph_pagelist_append(pl, &v, 1);
  42 }
  43 static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
  44                                               char *s, size_t len)
  45 {
  46         int ret = ceph_pagelist_encode_32(pl, len);
  47         if (ret)
  48                 return ret;
  49         if (len)
  50                 return ceph_pagelist_append(pl, s, len);
  51         return 0;
  52 }
  53
  54 #endif