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| author | Greg Farnum <gregf@hq.newdream.net> | 2010-09-17 10:10:55 -0700 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2010-10-20 15:38:16 -0700 |
| commit | ac0b74d8a1ced8ea86147467daf06b15b130dd94 (patch) | |
| tree | a71aec65be7f71b42ae78907acd5b0f4aeafd3a9 /include/linux/ceph | |
| parent | 18a38193efcaac1fb3c94ad8fa04bb117850a3c2 (diff) | |
| download | lwn-ac0b74d8a1ced8ea86147467daf06b15b130dd94.tar.gz lwn-ac0b74d8a1ced8ea86147467daf06b15b130dd94.zip | |
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/ceph')
| -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 { void *mapped_tail; size_t length; size_t room; + struct list_head free_list; + size_t num_pages_free; +}; + +struct ceph_pagelist_cursor { + struct ceph_pagelist *pl; /* pagelist, for error checking */ + struct list_head *page_lru; /* page in list */ + size_t room; /* room remaining to reset to */ }; static inline void ceph_pagelist_init(struct ceph_pagelist *pl) @@ -16,11 +24,24 @@ static inline void ceph_pagelist_init(struct ceph_pagelist *pl) pl->mapped_tail = NULL; pl->length = 0; pl->room = 0; + INIT_LIST_HEAD(&pl->free_list); + pl->num_pages_free = 0; } + extern int ceph_pagelist_release(struct ceph_pagelist *pl); extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); +extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space); + +extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl); + +extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl, + struct ceph_pagelist_cursor *c); + +extern int ceph_pagelist_truncate(struct ceph_pagelist *pl, + struct ceph_pagelist_cursor *c); + static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v) { __le64 ev = cpu_to_le64(v); |