1#ifndef __FS_CEPH_PAGELIST_H
2#define __FS_CEPH_PAGELIST_H
3
4#include <asm/byteorder.h>
5#include <linux/atomic.h>
6#include <linux/list.h>
7#include <linux/types.h>
8
9struct ceph_pagelist {
10	struct list_head head;
11	void *mapped_tail;
12	size_t length;
13	size_t room;
14	struct list_head free_list;
15	size_t num_pages_free;
16	atomic_t refcnt;
17};
18
19struct ceph_pagelist_cursor {
20	struct ceph_pagelist *pl;   /* pagelist, for error checking */
21	struct list_head *page_lru; /* page in list */
22	size_t room;		    /* room remaining to reset to */
23};
24
25static inline void ceph_pagelist_init(struct ceph_pagelist *pl)
26{
27	INIT_LIST_HEAD(&pl->head);
28	pl->mapped_tail = NULL;
29	pl->length = 0;
30	pl->room = 0;
31	INIT_LIST_HEAD(&pl->free_list);
32	pl->num_pages_free = 0;
33	atomic_set(&pl->refcnt, 1);
34}
35
36extern void ceph_pagelist_release(struct ceph_pagelist *pl);
37
38extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
39
40extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
41
42extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
43
44extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
45				     struct ceph_pagelist_cursor *c);
46
47extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
48				  struct ceph_pagelist_cursor *c);
49
50static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
51{
52	__le64 ev = cpu_to_le64(v);
53	return ceph_pagelist_append(pl, &ev, sizeof(ev));
54}
55static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
56{
57	__le32 ev = cpu_to_le32(v);
58	return ceph_pagelist_append(pl, &ev, sizeof(ev));
59}
60static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
61{
62	__le16 ev = cpu_to_le16(v);
63	return ceph_pagelist_append(pl, &ev, sizeof(ev));
64}
65static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
66{
67	return ceph_pagelist_append(pl, &v, 1);
68}
69static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
70					      char *s, size_t len)
71{
72	int ret = ceph_pagelist_encode_32(pl, len);
73	if (ret)
74		return ret;
75	if (len)
76		return ceph_pagelist_append(pl, s, len);
77	return 0;
78}
79
80#endif
81