51 lines
1,016 B
C
51 lines
1,016 B
C
#ifndef __FS_CEPH_BUFFER_H
|
|
#define __FS_CEPH_BUFFER_H
|
|
|
|
#include <linux/kref.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 {
|
|
struct kref kref;
|
|
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)
|
|
{
|
|
kref_get(&b->kref);
|
|
return b;
|
|
}
|
|
|
|
void ceph_buffer_release(struct kref *kref);
|
|
|
|
static inline void ceph_buffer_put(struct ceph_buffer *b)
|
|
{
|
|
if (b)
|
|
kref_put(&b->kref, ceph_buffer_release);
|
|
}
|
|
|
|
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
|