buffer.h

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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;
};

extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
extern void ceph_buffer_release(struct kref *kref);

static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
{
    kref_get(&b->kref);
    return b;
}

static inline void ceph_buffer_put(struct ceph_buffer *b)
{
    kref_put(&b->kref, ceph_buffer_release);
}

extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end);

#endif