LXR linux/include/linux/ceph/buffer.h

   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