#include "ceph_debug.h"
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "super.h"
#include "osd_client.h"
#include "messenger.h"
#include "decode.h"
#include "auth.h"
#define OSD_OP_FRONT_LEN 4096
#define OSD_OPREPLY_FRONT_LEN 512
const static struct ceph_connection_operations osd_con_ops;
static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
/*
* Implement client access to distributed object storage cluster.
*
* All data objects are stored within a cluster/cloud of OSDs, or
* "object storage devices." (Note that Ceph OSDs have _nothing_ to
* do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
* remote daemons serving up and coordinating consistent and safe
* access to storage.
*
* Cluster membership and the mapping of data objects onto storage devices
* are described by the osd map.
*
* We keep track of pending OSD requests (read, write), resubmit
* requests to different OSDs when the cluster topology/data layout
* change, or retry the affected requests when the communications
* channel with an OSD is reset.
*/
/*
* calculate the mapping of a file extent onto an object, and fill out the
* request accordingly. shorten extent as necessary if it crosses an
* object boundary.
*
* fill osd op in request message.
*/
static void calc_layout(struct ceph_osd_client *osdc,
struct ceph_vino vino, struct ceph_file_layout *layout,
u64 off, u64 *plen,
struct ceph_osd_request *req)
{
