linux/ceph/buffer.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __FS_CEPH_BUFFER_H
0003 #define __FS_CEPH_BUFFER_H
0004
0005 #include <linux/kref.h>
0006 #include <linux/mm.h>
0007 #include <linux/vmalloc.h>
0008 #include <linux/types.h>
0009 #include <linux/uio.h>
0010
0011 /*
0012  * a simple reference counted buffer.
0013  *
0014  * use kmalloc for smaller sizes, vmalloc for larger sizes.
0015  */
0016 struct ceph_buffer {
0017     struct kref kref;
0018     struct kvec vec;
0019     size_t alloc_len;
0020 };
0021
0022 extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
0023 extern void ceph_buffer_release(struct kref *kref);
0024
0025 static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
0026 {
0027     kref_get(&b->kref);
0028     return b;
0029 }
0030
0031 static inline void ceph_buffer_put(struct ceph_buffer *b)
0032 {
0033     if (b)
0034         kref_put(&b->kref, ceph_buffer_release);
0035 }
0036
0037 extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end);
0038
0039 #endif