1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __FS_CEPH_PAGELIST_H
3*4882a593Smuzhiyun #define __FS_CEPH_PAGELIST_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <asm/byteorder.h>
6*4882a593Smuzhiyun #include <linux/refcount.h>
7*4882a593Smuzhiyun #include <linux/list.h>
8*4882a593Smuzhiyun #include <linux/types.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun struct ceph_pagelist {
11*4882a593Smuzhiyun struct list_head head;
12*4882a593Smuzhiyun void *mapped_tail;
13*4882a593Smuzhiyun size_t length;
14*4882a593Smuzhiyun size_t room;
15*4882a593Smuzhiyun struct list_head free_list;
16*4882a593Smuzhiyun size_t num_pages_free;
17*4882a593Smuzhiyun refcount_t refcnt;
18*4882a593Smuzhiyun };
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun struct ceph_pagelist_cursor {
21*4882a593Smuzhiyun struct ceph_pagelist *pl; /* pagelist, for error checking */
22*4882a593Smuzhiyun struct list_head *page_lru; /* page in list */
23*4882a593Smuzhiyun size_t room; /* room remaining to reset to */
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun extern void ceph_pagelist_release(struct ceph_pagelist *pl);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l);
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl,
37*4882a593Smuzhiyun struct ceph_pagelist_cursor *c);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun extern int ceph_pagelist_truncate(struct ceph_pagelist *pl,
40*4882a593Smuzhiyun struct ceph_pagelist_cursor *c);
41*4882a593Smuzhiyun
ceph_pagelist_encode_64(struct ceph_pagelist * pl,u64 v)42*4882a593Smuzhiyun static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun __le64 ev = cpu_to_le64(v);
45*4882a593Smuzhiyun return ceph_pagelist_append(pl, &ev, sizeof(ev));
46*4882a593Smuzhiyun }
ceph_pagelist_encode_32(struct ceph_pagelist * pl,u32 v)47*4882a593Smuzhiyun static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun __le32 ev = cpu_to_le32(v);
50*4882a593Smuzhiyun return ceph_pagelist_append(pl, &ev, sizeof(ev));
51*4882a593Smuzhiyun }
ceph_pagelist_encode_16(struct ceph_pagelist * pl,u16 v)52*4882a593Smuzhiyun static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun __le16 ev = cpu_to_le16(v);
55*4882a593Smuzhiyun return ceph_pagelist_append(pl, &ev, sizeof(ev));
56*4882a593Smuzhiyun }
ceph_pagelist_encode_8(struct ceph_pagelist * pl,u8 v)57*4882a593Smuzhiyun static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun return ceph_pagelist_append(pl, &v, 1);
60*4882a593Smuzhiyun }
ceph_pagelist_encode_string(struct ceph_pagelist * pl,char * s,u32 len)61*4882a593Smuzhiyun static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl,
62*4882a593Smuzhiyun char *s, u32 len)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun int ret = ceph_pagelist_encode_32(pl, len);
65*4882a593Smuzhiyun if (ret)
66*4882a593Smuzhiyun return ret;
67*4882a593Smuzhiyun if (len)
68*4882a593Smuzhiyun return ceph_pagelist_append(pl, s, len);
69*4882a593Smuzhiyun return 0;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun #endif
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