1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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 | |
10 | struct 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 | |
20 | struct ceph_pagelist_cursor { |
21 | struct ceph_pagelist *pl; /* pagelist, for error checking */ |
22 | struct list_head *page_lru; /* page in list */ |
23 | size_t room; /* room remaining to reset to */ |
24 | }; |
25 | |
26 | struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags); |
27 | |
28 | extern void ceph_pagelist_release(struct ceph_pagelist *pl); |
29 | |
30 | extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); |
31 | |
32 | extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space); |
33 | |
34 | extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl); |
35 | |
36 | extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl, |
37 | struct ceph_pagelist_cursor *c); |
38 | |
39 | extern int ceph_pagelist_truncate(struct ceph_pagelist *pl, |
40 | struct ceph_pagelist_cursor *c); |
41 | |
42 | static 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, d: &ev, l: sizeof(ev)); |
46 | } |
47 | static 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, d: &ev, l: sizeof(ev)); |
51 | } |
52 | static 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, d: &ev, l: sizeof(ev)); |
56 | } |
57 | static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v) |
58 | { |
59 | return ceph_pagelist_append(pl, d: &v, l: 1); |
60 | } |
61 | static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl, |
62 | char *s, u32 len) |
63 | { |
64 | int ret = ceph_pagelist_encode_32(pl, v: len); |
65 | if (ret) |
66 | return ret; |
67 | if (len) |
68 | return ceph_pagelist_append(pl, d: s, l: len); |
69 | return 0; |
70 | } |
71 | |
72 | #endif |
73 | |