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 38