include/linux/ceph/buffer.h

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