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
25 static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
26 {
27 kref_get(&b->kref);
28 return b;
29 }
30
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
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