linux/include/linux/ceph/pagelist.h
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   1#ifndef __FS_CEPH_PAGELIST_H
   2#define __FS_CEPH_PAGELIST_H
   3
   4#include <linux/list.h>
   5
   6struct ceph_pagelist {
   7        struct list_head head;
   8        void *mapped_tail;
   9        size_t length;
  10        size_t room;
  11        struct list_head free_list;
  12        size_t num_pages_free;
  13};
  14
  15struct ceph_pagelist_cursor {
  16        struct ceph_pagelist *pl;   /* pagelist, for error checking */
  17        struct list_head *page_lru; /* page in list */
  18        size_t room;                /* room remaining to reset to */
  19};
  20
  21static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
  22{
  23        INIT_LIST_HEAD(&pl->head);
  24        pl->mapped_tail = NULL;
  25        pl->length = 0;
  26        pl->room = 0;
  27        INIT_LIST_HEAD(&pl->free_list);
  28        pl->num_pages_free = 0;
  29}
  30
  31extern int ceph_pagelist_release(struct ceph_pagelist *pl);
  32
  33extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
  34
  35extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
  36
  37extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
  38
  39extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
  40                                     struct ceph_pagelist_cursor *c);
  41
  42extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
  43                                  struct ceph_pagelist_cursor *c);
  44
  45static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
  46{
  47        __le64 ev = cpu_to_le64(v);
  48        return ceph_pagelist_append(pl, &ev, sizeof(ev));
  49}
  50static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
  51{
  52        __le32 ev = cpu_to_le32(v);
  53        return ceph_pagelist_append(pl, &ev, sizeof(ev));
  54}
  55static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
  56{
  57        __le16 ev = cpu_to_le16(v);
  58        return ceph_pagelist_append(pl, &ev, sizeof(ev));
  59}
  60static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
  61{
  62        return ceph_pagelist_append(pl, &v, 1);
  63}
  64static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
  65                                              char *s, size_t len)
  66{
  67        int ret = ceph_pagelist_encode_32(pl, len);
  68        if (ret)
  69                return ret;
  70        if (len)
  71                return ceph_pagelist_append(pl, s, len);
  72        return 0;
  73}
  74
  75#endif
  76
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