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  */
  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