blob: 16b1930acc45fbde34c3db7fe326f29c269b908b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
#ifndef __FS_CEPH_BUFFER_H
#define __FS_CEPH_BUFFER_H
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/types.h>
#include <linux/uio.h>
/*
* a simple reference counted buffer.
*
* use kmalloc for small sizes (<= one page), vmalloc for larger
* sizes.
*/
struct ceph_buffer {
atomic_t nref;
struct kvec vec;
size_t alloc_len;
bool is_vmalloc;
};
struct ceph_buffer *ceph_buffer_new(gfp_t gfp);
int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp);
static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
{
atomic_inc(&b->nref);
return b;
}
static inline void ceph_buffer_put(struct ceph_buffer *b)
{
if (b && atomic_dec_and_test(&b->nref)) {
if (b->vec.iov_base) {
if (b->is_vmalloc)
vfree(b->vec.iov_base);
else
kfree(b->vec.iov_base);
}
kfree(b);
}
}
static inline struct ceph_buffer *ceph_buffer_new_alloc(int len, gfp_t gfp)
{
struct ceph_buffer *b = ceph_buffer_new(gfp);
if (b && ceph_buffer_alloc(b, len, gfp) < 0) {
ceph_buffer_put(b);
b = NULL;
}
return b;
}
#endif
|
