1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __FS_CEPH_BUFFER_H
3#define __FS_CEPH_BUFFER_H
4
5#include <linux/kref.h>
6#include <linux/mm.h>
7#include <linux/vmalloc.h>
8#include <linux/types.h>
9#include <linux/uio.h>
10
11/*
12 * a simple reference counted buffer.
13 *
14 * use kmalloc for smaller sizes, vmalloc for larger sizes.
15 */
16struct ceph_buffer {
17	struct kref kref;
18	struct kvec vec;
19	size_t alloc_len;
20};
21
22extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
23extern void ceph_buffer_release(struct kref *kref);
24
25static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
26{
27	kref_get(&b->kref);
28	return b;
29}
30
31static inline void ceph_buffer_put(struct ceph_buffer *b)
32{
33	if (b)
34		kref_put(&b->kref, ceph_buffer_release);
35}
36
37extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end);
38
39#endif
40