/* internal AFS stuff
*
* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/rxrpc.h>
#include <linux/key.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/fscache.h>
#include <linux/backing-dev.h>
#include <linux/uuid.h>
#include <net/net_namespace.h>
#include <net/af_rxrpc.h>
#include "afs.h"
#include "afs_vl.h"
#define AFS_CELL_MAX_ADDRS 15
struct pagevec;
struct afs_call;
struct afs_mount_params {
bool rwpath; /* T if the parent should be considered R/W */
bool force; /* T to force cell type */
bool autocell; /* T if set auto mount operation */
afs_voltype_t type; /* type of volume requested */
int volnamesz; /* size of volume name */
const char *volname; /* name of volume to mount */
struct afs_net *net; /* Network namespace in effect */
struct afs_cell *cell; /* cell in which to find volume */
struct afs_volume *volume; /* volume record */
struct key *key; /* key to use for secure mounting */
};
struct afs_iget_data {
struct afs_fid fid;
struct afs_volume *volume; /* volume on which resides */
};
enum afs_call_state {
AFS_CALL_CL_REQUESTING, /* Client: Request is being sent */
AFS_CALL_CL_AWAIT_REPLY, /* Client: Awaiting reply */
AFS_CALL_CL_PROC_REPLY, /* Client: rxrpc call complete; processing reply */
AFS_CALL_SV_AWAIT_OP_ID, /* Server: Awaiting op ID */
AFS_CALL_SV_AWAIT_REQUEST, /* Server: Awaiting request data */
AFS_CALL_SV_REPLYING, /* Server: Replying */
AFS_CALL_SV_AWAIT_ACK, /* Server: Awaiting final ACK */
AFS_CALL_COMPLETE, /* Completed or failed */
};
/*
* List of server addresses.
*/
struct afs_addr_list {
struct rcu_head rcu; /* Must be first */
refcount_t usage;
u32 version; /* Version */
unsigned short nr_addrs;
unsigned short index; /* Address currently in use */
unsigned short nr_ipv4; /* Number of IPv4 addresses */
unsigned long probed; /* Mask of servers that have been probed */
unsigned long yfs; /* Mask of servers that are YFS */
struct sockaddr_rxrpc addrs[];
};
/*
* a record of an in-progress RxRPC call
*/
struct afs_call {
const struct afs_call_type *type; /* type of call */
wait_queue_head_t waitq; /* processes awaiting completion */
struct work_struct async_work; /* async I/O processor */
struct work_struct work; /* actual work processor */
struct rxrpc_call *rxcall; /* RxRPC call handle */
struct key *key; /* security for this call */
struct afs_net *net; /* The network namespace */
struct afs_server *cm_server; /* Server affected by incoming CM call */
struct afs_cb_interest *cbi; /* Callback interest for server used */
void *request; /* request data (first part) */
struct address_space *mapping; /* Pages being written from */
void *buffer; /* reply receive buffer */
void *reply[4]; /* Where to put the reply */
pgoff_t first; /* first page in mapping to deal with */
pgoff_t last; /* last page in mapping to deal with */
size_t offset; /* offset into received data store */
atomic_t usage;
enum afs_call_state state;
spinlock_t state_lock;
int error; /* error code */
u32 abort_code; /* Remote abort ID or 0 */
unsigned request_size; /* size of request data */
unsigned reply_max; /* maximum size of reply */
unsigned first_offset; /* offset into mapping[first] */
unsigned int cb_break; /* cb_break + cb_s_break before the call */
union {
unsigned last_to; /* amount of mapping[last] */
unsigned count2; /* count used in unmarshalling */
};
unsigned char unmarshall; /* unmarshalling phase */
bool incoming; /* T if incoming call */
bool send_pages; /* T if data from mapping should be sent */
bool need_attention; /* T if RxRPC poked us */
bool async; /* T if asynchronous */
bool ret_reply0; /* T if should return reply[0] on success */
bool upgrade; /* T to request service upgrade */
u16 service_id; /* Actual service ID (after upgrade) */
u32 operation_ID; /* operation ID for an incoming call */
u32 count; /* count for use in unmarshalling */
__be32 tmp;