diff options
author | Greg Farnum <gregf@hq.newdream.net> | 2010-09-17 13:10:55 -0400 |
---|---|---|
committer | Sage Weil <sage@newdream.net> | 2010-10-20 18:38:16 -0400 |
commit | ac0b74d8a1ced8ea86147467daf06b15b130dd94 (patch) | |
tree | a71aec65be7f71b42ae78907acd5b0f4aeafd3a9 /include/linux | |
parent | 18a38193efcaac1fb3c94ad8fa04bb117850a3c2 (diff) |
ceph: add pagelist_reserve, pagelist_truncate, pagelist_set_cursor
These facilitate preallocation of pages so that we can encode into the pagelist
in an atomic context.
Signed-off-by: Greg Farnum <gregf@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/ceph/pagelist.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/ceph/pagelist.h b/include/linux/ceph/pagelist.h index cc9327aa1c98..9660d6b0a35d 100644 --- a/include/linux/ceph/pagelist.h +++ b/include/linux/ceph/pagelist.h | |||
@@ -8,6 +8,14 @@ struct ceph_pagelist { | |||
8 | void *mapped_tail; | 8 | void *mapped_tail; |
9 | size_t length; | 9 | size_t length; |
10 | size_t room; | 10 | size_t room; |
11 | struct list_head free_list; | ||
12 | size_t num_pages_free; | ||
13 | }; | ||
14 | |||
15 | struct 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 */ | ||
11 | }; | 19 | }; |
12 | 20 | ||
13 | static inline void ceph_pagelist_init(struct ceph_pagelist *pl) | 21 | static inline void ceph_pagelist_init(struct ceph_pagelist *pl) |
@@ -16,11 +24,24 @@ static inline void ceph_pagelist_init(struct ceph_pagelist *pl) | |||
16 | pl->mapped_tail = NULL; | 24 | pl->mapped_tail = NULL; |
17 | pl->length = 0; | 25 | pl->length = 0; |
18 | pl->room = 0; | 26 | pl->room = 0; |
27 | INIT_LIST_HEAD(&pl->free_list); | ||
28 | pl->num_pages_free = 0; | ||
19 | } | 29 | } |
30 | |||
20 | extern int ceph_pagelist_release(struct ceph_pagelist *pl); | 31 | extern int ceph_pagelist_release(struct ceph_pagelist *pl); |
21 | 32 | ||
22 | extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); | 33 | extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); |
23 | 34 | ||
35 | extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space); | ||
36 | |||
37 | extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl); | ||
38 | |||
39 | extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl, | ||
40 | struct ceph_pagelist_cursor *c); | ||
41 | |||
42 | extern int ceph_pagelist_truncate(struct ceph_pagelist *pl, | ||
43 | struct ceph_pagelist_cursor *c); | ||
44 | |||
24 | static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v) | 45 | static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v) |
25 | { | 46 | { |
26 | __le64 ev = cpu_to_le64(v); | 47 | __le64 ev = cpu_to_le64(v); |