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  */
16 struct ceph_buffer {
17 	struct kref kref;
18 	struct kvec vec;
19 	size_t alloc_len;
20 };
21 
22 extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
23 extern void ceph_buffer_release(struct kref *kref);
24 
ceph_buffer_get(struct ceph_buffer * b)25 static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
26 {
27 	kref_get(&b->kref);
28 	return b;
29 }
30 
ceph_buffer_put(struct ceph_buffer * b)31 static inline void ceph_buffer_put(struct ceph_buffer *b)
32 {
33 	if (b)
34 		kref_put(&b->kref, ceph_buffer_release);
35 }
36 
37 extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end);
38 
39 #endif
40