projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 58bb3b37 SW |
1 | #ifndef __FS_CEPH_PAGELIST_H |
| 2 | #define __FS_CEPH_PAGELIST_H | |
| 3 | ||
| 84a1d2d1 | 4 | #include <asm/byteorder.h> |
| e4339d28 | 5 | #include <linux/atomic.h> |
| 84a1d2d1 ID |
6 | #include <linux/list.h> |
| 7 | #include <linux/types.h> | |
| 58bb3b37 SW |
8 | |
| 9 | struct ceph_pagelist { | |
| 10 | struct list_head head; | |
| 11 | void *mapped_tail; | |
| 12 | size_t length; | |
| 13 | size_t room; | |
| ac0b74d8 GF |
14 | struct list_head free_list; |
| 15 | size_t num_pages_free; | |
| e4339d28 | 16 | atomic_t refcnt; |
| ac0b74d8 GF |
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 */ | |
| 58bb3b37 SW |
23 | }; |
| 24 | ||
| 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; | |
| ac0b74d8 GF |
31 | INIT_LIST_HEAD(&pl->free_list); |
| 32 | pl->num_pages_free = 0; | |
| e4339d28 | 33 | atomic_set(&pl->refcnt, 1); |
| 58bb3b37 | 34 | } |
| ac0b74d8 | 35 | |
| e4339d28 | 36 | extern void ceph_pagelist_release(struct ceph_pagelist *pl); |
| 58bb3b37 | 37 | |
| 68b4476b | 38 | extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); |
| 58bb3b37 | 39 | |
| ac0b74d8 GF |
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 | ||
| 58bb3b37 SW |
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 | } | |
| 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 | } | |
| 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 | } | |
| 65 | static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v) | |
| 66 | { | |
| 67 | return ceph_pagelist_append(pl, &v, 1); | |
| 68 | } | |
| 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 |