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
9 struct 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
19 struct 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
ceph_pagelist_init(struct ceph_pagelist * pl)25 static 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
36 extern void ceph_pagelist_release(struct ceph_pagelist *pl);
37
38 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
39
40 extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
41
42 extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
43
44 extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
45 struct ceph_pagelist_cursor *c);
46
47 extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
48 struct ceph_pagelist_cursor *c);
49
ceph_pagelist_encode_64(struct ceph_pagelist * pl,u64 v)50 static 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 }
ceph_pagelist_encode_32(struct ceph_pagelist * pl,u32 v)55 static 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 }
ceph_pagelist_encode_16(struct ceph_pagelist * pl,u16 v)60 static 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 }
ceph_pagelist_encode_8(struct ceph_pagelist * pl,u8 v)65 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
66 {
67 return ceph_pagelist_append(pl, &v, 1);
68 }
ceph_pagelist_encode_string(struct ceph_pagelist * pl,char * s,size_t len)69 static 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