root/include/linux/ceph/pagelist.h

INCLUDED FROM

DEFINITIONS

1. ceph_pagelist_encode_64
2. ceph_pagelist_encode_32
3. ceph_pagelist_encode_16
4. ceph_pagelist_encode_8
5. ceph_pagelist_encode_string

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __FS_CEPH_PAGELIST_H
   3 #define __FS_CEPH_PAGELIST_H
   4 
   5 #include <asm/byteorder.h>
   6 #include <linux/refcount.h>
   7 #include <linux/list.h>
   8 #include <linux/types.h>
   9 
  10 struct ceph_pagelist {
  11         struct list_head head;
  12         void *mapped_tail;
  13         size_t length;
  14         size_t room;
  15         struct list_head free_list;
  16         size_t num_pages_free;
  17         refcount_t refcnt;
  18 };
  19 
  20 struct ceph_pagelist_cursor {
  21         struct ceph_pagelist *pl;   /* pagelist, for error checking */
  22         struct list_head *page_lru; /* page in list */
  23         size_t room;                /* room remaining to reset to */
  24 };
  25 
  26 struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags);
  27 
  28 extern void ceph_pagelist_release(struct ceph_pagelist *pl);
  29 
  30 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
  31 
  32 extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
  33 
  34 extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
  35 
  36 extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
  37                                      struct ceph_pagelist_cursor *c);
  38 
  39 extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
  40                                   struct ceph_pagelist_cursor *c);
  41 
  42 static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
  43 {
  44         __le64 ev = cpu_to_le64(v);
  45         return ceph_pagelist_append(pl, &ev, sizeof(ev));
  46 }
  47 static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
  48 {
  49         __le32 ev = cpu_to_le32(v);
  50         return ceph_pagelist_append(pl, &ev, sizeof(ev));
  51 }
  52 static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
  53 {
  54         __le16 ev = cpu_to_le16(v);
  55         return ceph_pagelist_append(pl, &ev, sizeof(ev));
  56 }
  57 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
  58 {
  59         return ceph_pagelist_append(pl, &v, 1);
  60 }
  61 static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
  62                                               char *s, u32 len)
  63 {
  64         int ret = ceph_pagelist_encode_32(pl, len);
  65         if (ret)
  66                 return ret;
  67         if (len)
  68                 return ceph_pagelist_append(pl, s, len);
  69         return 0;
  70 }
  71 
  72 #endif