// SPDX-License-Identifier: GPL-2.0-or-later
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/* AFS Cache Manager Service
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/ip.h>
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#include "internal.h"
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#include "afs_cm.h"
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#include "protocol_yfs.h"
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static int afs_deliver_cb_init_call_back_state(struct afs_call *);
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static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
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static int afs_deliver_cb_probe(struct afs_call *);
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static int afs_deliver_cb_callback(struct afs_call *);
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static int afs_deliver_cb_probe_uuid(struct afs_call *);
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static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
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static void afs_cm_destructor(struct afs_call *);
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static void SRXAFSCB_CallBack(struct work_struct *);
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static void SRXAFSCB_InitCallBackState(struct work_struct *);
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static void SRXAFSCB_Probe(struct work_struct *);
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static void SRXAFSCB_ProbeUuid(struct work_struct *);
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static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
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static int afs_deliver_yfs_cb_callback(struct afs_call *);
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/*
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* CB.CallBack operation type
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*/
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static const struct afs_call_type afs_SRXCBCallBack = {
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.name = "CB.CallBack",
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.deliver = afs_deliver_cb_callback,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_CallBack,
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};
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/*
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* CB.InitCallBackState operation type
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*/
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static const struct afs_call_type afs_SRXCBInitCallBackState = {
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.name = "CB.InitCallBackState",
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.deliver = afs_deliver_cb_init_call_back_state,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_InitCallBackState,
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};
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/*
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* CB.InitCallBackState3 operation type
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*/
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static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
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.name = "CB.InitCallBackState3",
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.deliver = afs_deliver_cb_init_call_back_state3,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_InitCallBackState,
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};
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/*
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* CB.Probe operation type
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*/
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static const struct afs_call_type afs_SRXCBProbe = {
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.name = "CB.Probe",
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.deliver = afs_deliver_cb_probe,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_Probe,
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};
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/*
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* CB.ProbeUuid operation type
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*/
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static const struct afs_call_type afs_SRXCBProbeUuid = {
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.name = "CB.ProbeUuid",
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.deliver = afs_deliver_cb_probe_uuid,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_ProbeUuid,
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};
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/*
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* CB.TellMeAboutYourself operation type
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*/
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static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
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.name = "CB.TellMeAboutYourself",
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.deliver = afs_deliver_cb_tell_me_about_yourself,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_TellMeAboutYourself,
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};
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/*
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* YFS CB.CallBack operation type
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*/
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static const struct afs_call_type afs_SRXYFSCB_CallBack = {
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.name = "YFSCB.CallBack",
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.deliver = afs_deliver_yfs_cb_callback,
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.destructor = afs_cm_destructor,
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.work = SRXAFSCB_CallBack,
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};
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/*
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* route an incoming cache manager call
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* - return T if supported, F if not
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*/
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bool afs_cm_incoming_call(struct afs_call *call)
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{
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_enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
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switch (call->operation_ID) {
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case CBCallBack:
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call->type = &afs_SRXCBCallBack;
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return true;
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case CBInitCallBackState:
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call->type = &afs_SRXCBInitCallBackState;
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return true;
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case CBInitCallBackState3:
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call->type = &afs_SRXCBInitCallBackState3;
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return true;
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case CBProbe:
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call->type = &afs_SRXCBProbe;
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return true;
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case CBProbeUuid:
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call->type = &afs_SRXCBProbeUuid;
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return true;
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case CBTellMeAboutYourself:
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call->type = &afs_SRXCBTellMeAboutYourself;
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return true;
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case YFSCBCallBack:
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if (call->service_id != YFS_CM_SERVICE)
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return false;
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call->type = &afs_SRXYFSCB_CallBack;
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return true;
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default:
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return false;
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}
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}
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/*
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* Find the server record by peer address and record a probe to the cache
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* manager from a server.
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*/
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static int afs_find_cm_server_by_peer(struct afs_call *call)
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{
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struct sockaddr_rxrpc srx;
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struct afs_server *server;
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rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
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server = afs_find_server(call->net, &srx);
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if (!server) {
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trace_afs_cm_no_server(call, &srx);
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return 0;
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}
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call->server = server;
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return 0;
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}
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/*
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* Find the server record by server UUID and record a probe to the cache
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* manager from a server.
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*/
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static int afs_find_cm_server_by_uuid(struct afs_call *call,
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struct afs_uuid *uuid)
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{
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struct afs_server *server;
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rcu_read_lock();
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server = afs_find_server_by_uuid(call->net, call->request);
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rcu_read_unlock();
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if (!server) {
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trace_afs_cm_no_server_u(call, call->request);
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return 0;
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}
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call->server = server;
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return 0;
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}
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/*
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* Clean up a cache manager call.
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*/
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static void afs_cm_destructor(struct afs_call *call)
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{
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kfree(call->buffer);
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call->buffer = NULL;
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}
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/*
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* Abort a service call from within an action function.
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*/
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static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,
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const char *why)
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{
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rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
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abort_code, error, why);
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afs_set_call_complete(call, error, 0);
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}
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/*
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* The server supplied a list of callbacks that it wanted to break.
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*/
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static void SRXAFSCB_CallBack(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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_enter("");
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/* We need to break the callbacks before sending the reply as the
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* server holds up change visibility till it receives our reply so as
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* to maintain cache coherency.
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*/
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if (call->server) {
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trace_afs_server(call->server,
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atomic_read(&call->server->ref),
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atomic_read(&call->server->active),
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afs_server_trace_callback);
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afs_break_callbacks(call->server, call->count, call->request);
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}
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afs_send_empty_reply(call);
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.CallBack call
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*/
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static int afs_deliver_cb_callback(struct afs_call *call)
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{
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struct afs_callback_break *cb;
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__be32 *bp;
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int ret, loop;
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_enter("{%u}", call->unmarshall);
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switch (call->unmarshall) {
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case 0:
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afs_extract_to_tmp(call);
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call->unmarshall++;
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/* extract the FID array and its count in two steps */
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fallthrough;
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case 1:
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_debug("extract FID count");
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ret = afs_extract_data(call, true);
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if (ret < 0)
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return ret;
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call->count = ntohl(call->tmp);
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_debug("FID count: %u", call->count);
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if (call->count > AFSCBMAX)
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return afs_protocol_error(call, afs_eproto_cb_fid_count);
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call->buffer = kmalloc(array3_size(call->count, 3, 4),
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GFP_KERNEL);
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if (!call->buffer)
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return -ENOMEM;
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afs_extract_to_buf(call, call->count * 3 * 4);
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call->unmarshall++;
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fallthrough;
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case 2:
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_debug("extract FID array");
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ret = afs_extract_data(call, true);
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if (ret < 0)
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return ret;
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_debug("unmarshall FID array");
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call->request = kcalloc(call->count,
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sizeof(struct afs_callback_break),
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GFP_KERNEL);
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if (!call->request)
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return -ENOMEM;
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cb = call->request;
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bp = call->buffer;
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for (loop = call->count; loop > 0; loop--, cb++) {
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cb->fid.vid = ntohl(*bp++);
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cb->fid.vnode = ntohl(*bp++);
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cb->fid.unique = ntohl(*bp++);
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}
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afs_extract_to_tmp(call);
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call->unmarshall++;
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/* extract the callback array and its count in two steps */
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fallthrough;
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case 3:
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_debug("extract CB count");
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ret = afs_extract_data(call, true);
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if (ret < 0)
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return ret;
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call->count2 = ntohl(call->tmp);
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_debug("CB count: %u", call->count2);
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if (call->count2 != call->count && call->count2 != 0)
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return afs_protocol_error(call, afs_eproto_cb_count);
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call->iter = &call->def_iter;
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iov_iter_discard(&call->def_iter, READ, call->count2 * 3 * 4);
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call->unmarshall++;
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fallthrough;
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case 4:
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_debug("extract discard %zu/%u",
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iov_iter_count(call->iter), call->count2 * 3 * 4);
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ret = afs_extract_data(call, false);
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if (ret < 0)
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return ret;
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call->unmarshall++;
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case 5:
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break;
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}
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if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
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return afs_io_error(call, afs_io_error_cm_reply);
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/* we'll need the file server record as that tells us which set of
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* vnodes to operate upon */
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return afs_find_cm_server_by_peer(call);
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}
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/*
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* allow the fileserver to request callback state (re-)initialisation
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*/
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static void SRXAFSCB_InitCallBackState(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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_enter("{%p}", call->server);
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if (call->server)
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afs_init_callback_state(call->server);
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afs_send_empty_reply(call);
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.InitCallBackState call
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*/
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static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
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{
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int ret;
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_enter("");
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afs_extract_discard(call, 0);
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ret = afs_extract_data(call, false);
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if (ret < 0)
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return ret;
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/* we'll need the file server record as that tells us which set of
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* vnodes to operate upon */
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return afs_find_cm_server_by_peer(call);
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}
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/*
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* deliver request data to a CB.InitCallBackState3 call
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*/
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static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
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{
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struct afs_uuid *r;
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unsigned loop;
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__be32 *b;
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int ret;
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_enter("");
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_enter("{%u}", call->unmarshall);
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switch (call->unmarshall) {
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case 0:
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call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
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if (!call->buffer)
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return -ENOMEM;
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afs_extract_to_buf(call, 11 * sizeof(__be32));
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call->unmarshall++;
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fallthrough;
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case 1:
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_debug("extract UUID");
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ret = afs_extract_data(call, false);
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switch (ret) {
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case 0: break;
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case -EAGAIN: return 0;
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default: return ret;
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}
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_debug("unmarshall UUID");
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call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
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if (!call->request)
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return -ENOMEM;
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b = call->buffer;
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r = call->request;
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r->time_low = b[0];
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r->time_mid = htons(ntohl(b[1]));
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r->time_hi_and_version = htons(ntohl(b[2]));
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r->clock_seq_hi_and_reserved = ntohl(b[3]);
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r->clock_seq_low = ntohl(b[4]);
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for (loop = 0; loop < 6; loop++)
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r->node[loop] = ntohl(b[loop + 5]);
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call->unmarshall++;
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case 2:
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break;
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}
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if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
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return afs_io_error(call, afs_io_error_cm_reply);
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/* we'll need the file server record as that tells us which set of
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* vnodes to operate upon */
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return afs_find_cm_server_by_uuid(call, call->request);
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}
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/*
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* allow the fileserver to see if the cache manager is still alive
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*/
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static void SRXAFSCB_Probe(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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_enter("");
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afs_send_empty_reply(call);
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.Probe call
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*/
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static int afs_deliver_cb_probe(struct afs_call *call)
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{
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int ret;
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_enter("");
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afs_extract_discard(call, 0);
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ret = afs_extract_data(call, false);
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if (ret < 0)
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return ret;
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if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
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return afs_io_error(call, afs_io_error_cm_reply);
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return afs_find_cm_server_by_peer(call);
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}
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/*
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* Allow the fileserver to quickly find out if the cache manager has been
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* rebooted.
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*/
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static void SRXAFSCB_ProbeUuid(struct work_struct *work)
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{
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struct afs_call *call = container_of(work, struct afs_call, work);
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struct afs_uuid *r = call->request;
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_enter("");
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if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
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afs_send_empty_reply(call);
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else
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afs_abort_service_call(call, 1, 1, "K-1");
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afs_put_call(call);
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_leave("");
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}
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/*
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* deliver request data to a CB.ProbeUuid call
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*/
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static int afs_deliver_cb_probe_uuid(struct afs_call *call)
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{
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struct afs_uuid *r;
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unsigned loop;
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__be32 *b;
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int ret;
|
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_enter("{%u}", call->unmarshall);
|
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switch (call->unmarshall) {
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case 0:
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call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
|
if (!call->buffer)
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return -ENOMEM;
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afs_extract_to_buf(call, 11 * sizeof(__be32));
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call->unmarshall++;
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fallthrough;
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case 1:
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_debug("extract UUID");
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ret = afs_extract_data(call, false);
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switch (ret) {
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case 0: break;
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case -EAGAIN: return 0;
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default: return ret;
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}
|
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_debug("unmarshall UUID");
|
call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
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if (!call->request)
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return -ENOMEM;
|
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b = call->buffer;
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r = call->request;
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r->time_low = b[0];
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r->time_mid = htons(ntohl(b[1]));
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r->time_hi_and_version = htons(ntohl(b[2]));
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r->clock_seq_hi_and_reserved = ntohl(b[3]);
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r->clock_seq_low = ntohl(b[4]);
|
|
for (loop = 0; loop < 6; loop++)
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r->node[loop] = ntohl(b[loop + 5]);
|
|
call->unmarshall++;
|
|
case 2:
|
break;
|
}
|
|
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
|
return afs_io_error(call, afs_io_error_cm_reply);
|
return afs_find_cm_server_by_peer(call);
|
}
|
|
/*
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* allow the fileserver to ask about the cache manager's capabilities
|
*/
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static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
|
{
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struct afs_call *call = container_of(work, struct afs_call, work);
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int loop;
|
|
struct {
|
struct /* InterfaceAddr */ {
|
__be32 nifs;
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__be32 uuid[11];
|
__be32 ifaddr[32];
|
__be32 netmask[32];
|
__be32 mtu[32];
|
} ia;
|
struct /* Capabilities */ {
|
__be32 capcount;
|
__be32 caps[1];
|
} cap;
|
} reply;
|
|
_enter("");
|
|
memset(&reply, 0, sizeof(reply));
|
|
reply.ia.uuid[0] = call->net->uuid.time_low;
|
reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
|
reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
|
reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
|
reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
|
for (loop = 0; loop < 6; loop++)
|
reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
|
|
reply.cap.capcount = htonl(1);
|
reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
|
afs_send_simple_reply(call, &reply, sizeof(reply));
|
afs_put_call(call);
|
_leave("");
|
}
|
|
/*
|
* deliver request data to a CB.TellMeAboutYourself call
|
*/
|
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
|
{
|
int ret;
|
|
_enter("");
|
|
afs_extract_discard(call, 0);
|
ret = afs_extract_data(call, false);
|
if (ret < 0)
|
return ret;
|
|
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
|
return afs_io_error(call, afs_io_error_cm_reply);
|
return afs_find_cm_server_by_peer(call);
|
}
|
|
/*
|
* deliver request data to a YFS CB.CallBack call
|
*/
|
static int afs_deliver_yfs_cb_callback(struct afs_call *call)
|
{
|
struct afs_callback_break *cb;
|
struct yfs_xdr_YFSFid *bp;
|
size_t size;
|
int ret, loop;
|
|
_enter("{%u}", call->unmarshall);
|
|
switch (call->unmarshall) {
|
case 0:
|
afs_extract_to_tmp(call);
|
call->unmarshall++;
|
|
/* extract the FID array and its count in two steps */
|
fallthrough;
|
case 1:
|
_debug("extract FID count");
|
ret = afs_extract_data(call, true);
|
if (ret < 0)
|
return ret;
|
|
call->count = ntohl(call->tmp);
|
_debug("FID count: %u", call->count);
|
if (call->count > YFSCBMAX)
|
return afs_protocol_error(call, afs_eproto_cb_fid_count);
|
|
size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
|
call->buffer = kmalloc(size, GFP_KERNEL);
|
if (!call->buffer)
|
return -ENOMEM;
|
afs_extract_to_buf(call, size);
|
call->unmarshall++;
|
|
fallthrough;
|
case 2:
|
_debug("extract FID array");
|
ret = afs_extract_data(call, false);
|
if (ret < 0)
|
return ret;
|
|
_debug("unmarshall FID array");
|
call->request = kcalloc(call->count,
|
sizeof(struct afs_callback_break),
|
GFP_KERNEL);
|
if (!call->request)
|
return -ENOMEM;
|
|
cb = call->request;
|
bp = call->buffer;
|
for (loop = call->count; loop > 0; loop--, cb++) {
|
cb->fid.vid = xdr_to_u64(bp->volume);
|
cb->fid.vnode = xdr_to_u64(bp->vnode.lo);
|
cb->fid.vnode_hi = ntohl(bp->vnode.hi);
|
cb->fid.unique = ntohl(bp->vnode.unique);
|
bp++;
|
}
|
|
afs_extract_to_tmp(call);
|
call->unmarshall++;
|
|
case 3:
|
break;
|
}
|
|
if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
|
return afs_io_error(call, afs_io_error_cm_reply);
|
|
/* We'll need the file server record as that tells us which set of
|
* vnodes to operate upon.
|
*/
|
return afs_find_cm_server_by_peer(call);
|
}
|
