1
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
10struct 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
20struct ceph_pagelist_cursor {
21 struct ceph_pagelist *pl;
22 struct list_head *page_lru;
23 size_t room;
24};
25
26struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags);
27
28extern void ceph_pagelist_release(struct ceph_pagelist *pl);
29
30extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
31
32extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
33
34extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
35
36extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
37 struct ceph_pagelist_cursor *c);
38
39extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
40 struct ceph_pagelist_cursor *c);
41
42static 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}
47static 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}
52static 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}
57static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
58{
59 return ceph_pagelist_append(pl, &v, 1);
60}
61static 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
73