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 struct list_head free_list;
12 size_t num_pages_free;
13 };
14
15 struct 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
ceph_pagelist_init(struct ceph_pagelist * pl)21 static 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
31 extern int ceph_pagelist_release(struct ceph_pagelist *pl);
32
33 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
34
35 extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
36
37 extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
38
39 extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
40 struct ceph_pagelist_cursor *c);
41
42 extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
43 struct ceph_pagelist_cursor *c);
44
ceph_pagelist_encode_64(struct ceph_pagelist * pl,u64 v)45 static 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 }
ceph_pagelist_encode_32(struct ceph_pagelist * pl,u32 v)50 static 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 }
ceph_pagelist_encode_16(struct ceph_pagelist * pl,u16 v)55 static 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 }
ceph_pagelist_encode_8(struct ceph_pagelist * pl,u8 v)60 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
61 {
62 return ceph_pagelist_append(pl, &v, 1);
63 }
ceph_pagelist_encode_string(struct ceph_pagelist * pl,char * s,size_t len)64 static 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