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linux-next/include/linux/ceph/buffer.h
Yehuda Sadeh 3d14c5d2b6 ceph: factor out libceph from Ceph file system
This factors out protocol and low-level storage parts of ceph into a
separate libceph module living in net/ceph and include/linux/ceph.  This
is mostly a matter of moving files around.  However, a few key pieces
of the interface change as well:

 - ceph_client becomes ceph_fs_client and ceph_client, where the latter
   captures the mon and osd clients, and the fs_client gets the mds client
   and file system specific pieces.
 - Mount option parsing and debugfs setup is correspondingly broken into
   two pieces.
 - The mon client gets a generic handler callback for otherwise unknown
   messages (mds map, in this case).
 - The basic supported/required feature bits can be expanded (and are by
   ceph_fs_client).

No functional change, aside from some subtle error handling cases that got
cleaned up in the refactoring process.

Signed-off-by: Sage Weil <sage@newdream.net>
2010-10-20 15:37:28 -07:00

40 lines
818 B
C

#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