Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef __FS_CEPH_PAGELIST_H
2#define __FS_CEPH_PAGELIST_H
3
4#include <linux/list.h>
5
6struct 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
15struct 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
21static 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
31extern int ceph_pagelist_release(struct ceph_pagelist *pl);
32
33extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
34
35extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
36
37extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
38
39extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
40 struct ceph_pagelist_cursor *c);
41
42extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
43 struct ceph_pagelist_cursor *c);
44
45static 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}
50static 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}
55static 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}
60static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
61{
62 return ceph_pagelist_append(pl, &v, 1);
63}
64static 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