xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ceph: add pagelist_reserve, pagelist_truncate, pagelist_set_cursor

Browse Source 
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>
This commit is contained in:
Greg Farnum
2010-09-17 10:10:55 -07:00
committed by Sage Weil
parent 18a38193ef
commit ac0b74d8a1
2 changed files with 118 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
include/linux/ceph/pagelist.h
View File

@@ -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);