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#ifndef __FS_CEPH_BUFFER_H
#define __FS_CEPH_BUFFER_H
#include <linux/kref.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/types.h>
#include <linux/uio.h>
/*
* a simple reference counted buffer.
*
* use kmalloc for small sizes (<= one page), vmalloc for larger
* sizes.
*/
struct ceph_buffer {
struct kref kref;
struct kvec vec;
size_t alloc_len;
bool is_vmalloc;
};
struct ceph_buffer *ceph_buffer_new(gfp_t gfp);
int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp);
static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
{
kref_get(&b->kref);
return b;
}
void ceph_buffer_release(struct kref *kref);
static inline void ceph_buffer_put(struct ceph_buffer *b)
{
if (b)
kref_put(&b->kref, ceph_buffer_release);
}
static inline struct ceph_buffer *ceph_buffer_new_alloc(int len, gfp_t gfp)
{
struct ceph_buffer *b = ceph_buffer_new(gfp);
if (b && ceph_buffer_alloc(b, len, gfp) < 0) {
ceph_buffer_put(b);
b = NULL;
}
return b;
}
#endif
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