fs/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 small sizes (<= one page), vmalloc for larger
  14  * sizes.
  15  */
  16 struct ceph_buffer {
  17         struct kref kref;
  18         struct kvec vec;
  19         size_t alloc_len;
  20         bool is_vmalloc;
  21 };
  22
  23 extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
  24 extern void ceph_buffer_release(struct kref *kref);
  25
  26 static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
  27 {
  28         kref_get(&b->kref);
  29         return b;
  30 }
  31
  32 static inline void ceph_buffer_put(struct ceph_buffer *b)
  33 {
  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