603 lines
14 KiB
C
603 lines
14 KiB
C
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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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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/*
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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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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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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.abort_to_error = afs_abort_to_error,
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.destructor = afs_cm_destructor,
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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("{CB.OP %u}", 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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default:
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return false;
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}
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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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_enter("");
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/* Break the callbacks here so that we do it after the final ACK is
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* received. The step number here must match the final number in
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* afs_deliver_cb_callback().
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*/
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if (call->unmarshall == 5) {
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ASSERT(call->server && call->count && call->request);
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afs_break_callbacks(call->server, call->count, call->request);
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}
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afs_put_server(call->server);
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call->server = NULL;
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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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* allow the fileserver to see if the cache manager is still alive
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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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/* be sure to send the reply *before* attempting to spam the AFS server
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* with FSFetchStatus requests on the vnodes with broken callbacks lest
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* the AFS server get into a vicious cycle of trying to break further
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* callbacks because it hadn't received completion of the CBCallBack op
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* yet */
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afs_send_empty_reply(call);
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afs_break_callbacks(call->server, call->count, call->request);
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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 sockaddr_rxrpc srx;
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struct afs_callback *cb;
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struct afs_server *server;
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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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rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
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call->offset = 0;
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call->unmarshall++;
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/* extract the FID array and its count in two steps */
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case 1:
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_debug("extract FID count");
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ret = afs_extract_data(call, &call->tmp, 4, 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 -EBADMSG;
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call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
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if (!call->buffer)
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return -ENOMEM;
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call->offset = 0;
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call->unmarshall++;
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case 2:
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_debug("extract FID array");
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ret = afs_extract_data(call, call->buffer,
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call->count * 3 * 4, 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),
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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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cb->type = AFSCM_CB_UNTYPED;
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}
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call->offset = 0;
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call->unmarshall++;
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/* extract the callback array and its count in two steps */
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case 3:
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_debug("extract CB count");
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ret = afs_extract_data(call, &call->tmp, 4, 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 -EBADMSG;
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call->offset = 0;
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call->unmarshall++;
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case 4:
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_debug("extract CB array");
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ret = afs_extract_data(call, call->buffer,
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call->count2 * 3 * 4, false);
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if (ret < 0)
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return ret;
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_debug("unmarshall CB array");
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cb = call->request;
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bp = call->buffer;
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for (loop = call->count2; loop > 0; loop--, cb++) {
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cb->version = ntohl(*bp++);
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cb->expiry = ntohl(*bp++);
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cb->type = ntohl(*bp++);
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}
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call->offset = 0;
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call->unmarshall++;
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/* Record that the message was unmarshalled successfully so
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* that the call destructor can know do the callback breaking
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* work, even if the final ACK isn't received.
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*
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* If the step number changes, then afs_cm_destructor() must be
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* updated also.
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*/
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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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call->state = AFS_CALL_REPLYING;
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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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server = afs_find_server(&srx);
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if (!server)
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return -ENOTCONN;
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call->server = server;
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INIT_WORK(&call->work, SRXAFSCB_CallBack);
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queue_work(afs_wq, &call->work);
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return 0;
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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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afs_init_callback_state(call->server);
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afs_send_empty_reply(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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struct sockaddr_rxrpc srx;
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struct afs_server *server;
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int ret;
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_enter("");
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rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
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ret = afs_extract_data(call, NULL, 0, false);
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if (ret < 0)
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return ret;
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/* no unmarshalling required */
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call->state = AFS_CALL_REPLYING;
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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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server = afs_find_server(&srx);
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if (!server)
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return -ENOTCONN;
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call->server = server;
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INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
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queue_work(afs_wq, &call->work);
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return 0;
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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 sockaddr_rxrpc srx;
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struct afs_server *server;
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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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rxrpc_kernel_get_peer(afs_socket, call->rxcall, &srx);
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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->offset = 0;
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call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
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if (!call->buffer)
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return -ENOMEM;
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call->unmarshall++;
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case 1:
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_debug("extract UUID");
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ret = afs_extract_data(call, call->buffer,
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11 * sizeof(__be32), 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 = ntohl(b[0]);
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r->time_mid = ntohl(b[1]);
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r->time_hi_and_version = 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]);
|
||
|
|
|
||
|
|
call->offset = 0;
|
||
|
|
call->unmarshall++;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* no unmarshalling required */
|
||
|
|
call->state = AFS_CALL_REPLYING;
|
||
|
|
|
||
|
|
/* we'll need the file server record as that tells us which set of
|
||
|
|
* vnodes to operate upon */
|
||
|
|
server = afs_find_server(&srx);
|
||
|
|
if (!server)
|
||
|
|
return -ENOTCONN;
|
||
|
|
call->server = server;
|
||
|
|
|
||
|
|
INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
|
||
|
|
queue_work(afs_wq, &call->work);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* allow the fileserver to see if the cache manager is still alive
|
||
|
|
*/
|
||
|
|
static void SRXAFSCB_Probe(struct work_struct *work)
|
||
|
|
{
|
||
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
||
|
|
|
||
|
|
_enter("");
|
||
|
|
afs_send_empty_reply(call);
|
||
|
|
_leave("");
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* deliver request data to a CB.Probe call
|
||
|
|
*/
|
||
|
|
static int afs_deliver_cb_probe(struct afs_call *call)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
_enter("");
|
||
|
|
|
||
|
|
ret = afs_extract_data(call, NULL, 0, false);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/* no unmarshalling required */
|
||
|
|
call->state = AFS_CALL_REPLYING;
|
||
|
|
|
||
|
|
INIT_WORK(&call->work, SRXAFSCB_Probe);
|
||
|
|
queue_work(afs_wq, &call->work);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* allow the fileserver to quickly find out if the fileserver has been rebooted
|
||
|
|
*/
|
||
|
|
static void SRXAFSCB_ProbeUuid(struct work_struct *work)
|
||
|
|
{
|
||
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
||
|
|
struct afs_uuid *r = call->request;
|
||
|
|
|
||
|
|
struct {
|
||
|
|
__be32 match;
|
||
|
|
} reply;
|
||
|
|
|
||
|
|
_enter("");
|
||
|
|
|
||
|
|
if (memcmp(r, &afs_uuid, sizeof(afs_uuid)) == 0)
|
||
|
|
reply.match = htonl(0);
|
||
|
|
else
|
||
|
|
reply.match = htonl(1);
|
||
|
|
|
||
|
|
afs_send_simple_reply(call, &reply, sizeof(reply));
|
||
|
|
_leave("");
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* deliver request data to a CB.ProbeUuid call
|
||
|
|
*/
|
||
|
|
static int afs_deliver_cb_probe_uuid(struct afs_call *call)
|
||
|
|
{
|
||
|
|
struct afs_uuid *r;
|
||
|
|
unsigned loop;
|
||
|
|
__be32 *b;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
_enter("{%u}", call->unmarshall);
|
||
|
|
|
||
|
|
switch (call->unmarshall) {
|
||
|
|
case 0:
|
||
|
|
call->offset = 0;
|
||
|
|
call->buffer = kmalloc(11 * sizeof(__be32), GFP_KERNEL);
|
||
|
|
if (!call->buffer)
|
||
|
|
return -ENOMEM;
|
||
|
|
call->unmarshall++;
|
||
|
|
|
||
|
|
case 1:
|
||
|
|
_debug("extract UUID");
|
||
|
|
ret = afs_extract_data(call, call->buffer,
|
||
|
|
11 * sizeof(__be32), false);
|
||
|
|
switch (ret) {
|
||
|
|
case 0: break;
|
||
|
|
case -EAGAIN: return 0;
|
||
|
|
default: return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
_debug("unmarshall UUID");
|
||
|
|
call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
|
||
|
|
if (!call->request)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
b = call->buffer;
|
||
|
|
r = call->request;
|
||
|
|
r->time_low = ntohl(b[0]);
|
||
|
|
r->time_mid = ntohl(b[1]);
|
||
|
|
r->time_hi_and_version = ntohl(b[2]);
|
||
|
|
r->clock_seq_hi_and_reserved = ntohl(b[3]);
|
||
|
|
r->clock_seq_low = ntohl(b[4]);
|
||
|
|
|
||
|
|
for (loop = 0; loop < 6; loop++)
|
||
|
|
r->node[loop] = ntohl(b[loop + 5]);
|
||
|
|
|
||
|
|
call->offset = 0;
|
||
|
|
call->unmarshall++;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
call->state = AFS_CALL_REPLYING;
|
||
|
|
|
||
|
|
INIT_WORK(&call->work, SRXAFSCB_ProbeUuid);
|
||
|
|
queue_work(afs_wq, &call->work);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* allow the fileserver to ask about the cache manager's capabilities
|
||
|
|
*/
|
||
|
|
static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
|
||
|
|
{
|
||
|
|
struct afs_interface *ifs;
|
||
|
|
struct afs_call *call = container_of(work, struct afs_call, work);
|
||
|
|
int loop, nifs;
|
||
|
|
|
||
|
|
struct {
|
||
|
|
struct /* InterfaceAddr */ {
|
||
|
|
__be32 nifs;
|
||
|
|
__be32 uuid[11];
|
||
|
|
__be32 ifaddr[32];
|
||
|
|
__be32 netmask[32];
|
||
|
|
__be32 mtu[32];
|
||
|
|
} ia;
|
||
|
|
struct /* Capabilities */ {
|
||
|
|
__be32 capcount;
|
||
|
|
__be32 caps[1];
|
||
|
|
} cap;
|
||
|
|
} reply;
|
||
|
|
|
||
|
|
_enter("");
|
||
|
|
|
||
|
|
nifs = 0;
|
||
|
|
ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
|
||
|
|
if (ifs) {
|
||
|
|
nifs = afs_get_ipv4_interfaces(ifs, 32, false);
|
||
|
|
if (nifs < 0) {
|
||
|
|
kfree(ifs);
|
||
|
|
ifs = NULL;
|
||
|
|
nifs = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
memset(&reply, 0, sizeof(reply));
|
||
|
|
reply.ia.nifs = htonl(nifs);
|
||
|
|
|
||
|
|
reply.ia.uuid[0] = htonl(afs_uuid.time_low);
|
||
|
|
reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
|
||
|
|
reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
|
||
|
|
reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
|
||
|
|
reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
|
||
|
|
for (loop = 0; loop < 6; loop++)
|
||
|
|
reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
|
||
|
|
|
||
|
|
if (ifs) {
|
||
|
|
for (loop = 0; loop < nifs; loop++) {
|
||
|
|
reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
|
||
|
|
reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
|
||
|
|
reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
|
||
|
|
}
|
||
|
|
kfree(ifs);
|
||
|
|
}
|
||
|
|
|
||
|
|
reply.cap.capcount = htonl(1);
|
||
|
|
reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
|
||
|
|
afs_send_simple_reply(call, &reply, sizeof(reply));
|
||
|
|
|
||
|
|
_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("");
|
||
|
|
|
||
|
|
ret = afs_extract_data(call, NULL, 0, false);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/* no unmarshalling required */
|
||
|
|
call->state = AFS_CALL_REPLYING;
|
||
|
|
|
||
|
|
INIT_WORK(&call->work, SRXAFSCB_TellMeAboutYourself);
|
||
|
|
queue_work(afs_wq, &call->work);
|
||
|
|
return 0;
|
||
|
|
}
|