xref: /OK3568_Linux_fs/kernel/include/linux/ceph/buffer.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __FS_CEPH_BUFFER_H
3*4882a593Smuzhiyun #define __FS_CEPH_BUFFER_H
4*4882a593Smuzhiyun 
5*4882a593Smuzhiyun #include <linux/kref.h>
6*4882a593Smuzhiyun #include <linux/mm.h>
7*4882a593Smuzhiyun #include <linux/vmalloc.h>
8*4882a593Smuzhiyun #include <linux/types.h>
9*4882a593Smuzhiyun #include <linux/uio.h>
10*4882a593Smuzhiyun 
11*4882a593Smuzhiyun /*
12*4882a593Smuzhiyun  * a simple reference counted buffer.
13*4882a593Smuzhiyun  *
14*4882a593Smuzhiyun  * use kmalloc for smaller sizes, vmalloc for larger sizes.
15*4882a593Smuzhiyun  */
16*4882a593Smuzhiyun struct ceph_buffer {
17*4882a593Smuzhiyun 	struct kref kref;
18*4882a593Smuzhiyun 	struct kvec vec;
19*4882a593Smuzhiyun 	size_t alloc_len;
20*4882a593Smuzhiyun };
21*4882a593Smuzhiyun 
22*4882a593Smuzhiyun extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
23*4882a593Smuzhiyun extern void ceph_buffer_release(struct kref *kref);
24*4882a593Smuzhiyun 
ceph_buffer_get(struct ceph_buffer * b)25*4882a593Smuzhiyun static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun 	kref_get(&b->kref);
28*4882a593Smuzhiyun 	return b;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun 
ceph_buffer_put(struct ceph_buffer * b)31*4882a593Smuzhiyun static inline void ceph_buffer_put(struct ceph_buffer *b)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun 	if (b)
34*4882a593Smuzhiyun 		kref_put(&b->kref, ceph_buffer_release);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun 
37*4882a593Smuzhiyun extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end);
38*4882a593Smuzhiyun 
39*4882a593Smuzhiyun #endif
40