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Sage Weilc30dbb92009-10-06 11:31:07 -07001#ifndef __FS_CEPH_BUFFER_H
2#define __FS_CEPH_BUFFER_H
3
Sage Weildd26d852009-12-05 10:13:33 -08004#include <linux/kref.h>
Sage Weilc30dbb92009-10-06 11:31:07 -07005#include <linux/mm.h>
6#include <linux/vmalloc.h>
7#include <linux/types.h>
8#include <linux/uio.h>
9
10/*
11 * a simple reference counted buffer.
12 *
13 * use kmalloc for small sizes (<= one page), vmalloc for larger
14 * sizes.
15 */
16struct ceph_buffer {
Sage Weildd26d852009-12-05 10:13:33 -080017 struct kref kref;
Sage Weilc30dbb92009-10-06 11:31:07 -070018 struct kvec vec;
19 size_t alloc_len;
Sage Weilc30dbb92009-10-06 11:31:07 -070020};
21
Sage Weilb6c1d5b2009-12-07 12:17:17 -080022extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
23extern void ceph_buffer_release(struct kref *kref);
Sage Weilc30dbb92009-10-06 11:31:07 -070024
25static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
26{
Sage Weildd26d852009-12-05 10:13:33 -080027 kref_get(&b->kref);
Sage Weilc30dbb92009-10-06 11:31:07 -070028 return b;
29}
30
31static inline void ceph_buffer_put(struct ceph_buffer *b)
32{
Sage Weilb6c1d5b2009-12-07 12:17:17 -080033 kref_put(&b->kref, ceph_buffer_release);
Sage Weilc30dbb92009-10-06 11:31:07 -070034}
35
Sage Weilc7e337d2010-02-02 16:11:19 -080036extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end);
37
Sage Weilc30dbb92009-10-06 11:31:07 -070038#endif