[mirror_ubuntu-bionic-kernel.git] / fs / afs / cmservice.c

/* AFS Cache Manager Service
 *
 * Copyright (C) 2002 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/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ip.h>
#include "internal.h"
#include "afs_cm.h"

struct workqueue_struct *afs_cm_workqueue;

static int afs_deliver_cb_init_call_back_state(struct afs_call *,
					       struct sk_buff *, bool);
static int afs_deliver_cb_probe(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_callback(struct afs_call *, struct sk_buff *, bool);
static int afs_deliver_cb_get_capabilities(struct afs_call *, struct sk_buff *,
					   bool);
static void afs_cm_destructor(struct afs_call *);

/*
 * CB.CallBack operation type
 */
static const struct afs_call_type afs_SRXCBCallBack = {
	.name		= "CB.CallBack",
	.deliver	= afs_deliver_cb_callback,
	.abort_to_error	= afs_abort_to_error,
	.destructor	= afs_cm_destructor,
};

/*
 * CB.InitCallBackState operation type
 */
static const struct afs_call_type afs_SRXCBInitCallBackState = {
	.name		= "CB.InitCallBackState",
	.deliver	= afs_deliver_cb_init_call_back_state,
	.abort_to_error	= afs_abort_to_error,
	.destructor	= afs_cm_destructor,
};

/*
 * CB.Probe operation type
 */
static const struct afs_call_type afs_SRXCBProbe = {
	.name		= "CB.Probe",
	.deliver	= afs_deliver_cb_probe,
	.abort_to_error	= afs_abort_to_error,
	.destructor	= afs_cm_destructor,
};

/*
 * CB.GetCapabilities operation type
 */
static const struct afs_call_type afs_SRXCBGetCapabilites = {
	.name		= "CB.GetCapabilities",
	.deliver	= afs_deliver_cb_get_capabilities,
	.abort_to_error	= afs_abort_to_error,
	.destructor	= afs_cm_destructor,
};

/*
 * route an incoming cache manager call
 * - return T if supported, F if not
 */
bool afs_cm_incoming_call(struct afs_call *call)
{
	u32 operation_id = ntohl(call->operation_ID);

	_enter("{CB.OP %u}", operation_id);

	switch (operation_id) {
	case CBCallBack:
		call->type = &afs_SRXCBCallBack;
		return true;
	case CBInitCallBackState:
		call->type = &afs_SRXCBInitCallBackState;
		return true;
	case CBProbe:
		call->type = &afs_SRXCBProbe;
		return true;
	case CBGetCapabilities:
		call->type = &afs_SRXCBGetCapabilites;
		return true;
	default:
		return false;
	}
}

/*
 * clean up a cache manager call
 */
static void afs_cm_destructor(struct afs_call *call)
{
	_enter("");

	afs_put_server(call->server);
	call->server = NULL;
	kfree(call->buffer);
	call->buffer = NULL;
}

/*
 * allow the fileserver to see if the cache manager is still alive
 */
static void SRXAFSCB_CallBack(struct work_struct *work)
{
	struct afs_call *call = container_of(work, struct afs_call, work);

	_enter("");

	/* be sure to send the reply *before* attempting to spam the AFS server
	 * with FSFetchStatus requests on the vnodes with broken callbacks lest
	 * the AFS server get into a vicious cycle of trying to break further
	 * callbacks because it hadn't received completion of the CBCallBack op
	 * yet */
	afs_send_empty_reply(call);

	afs_break_callbacks(call->server, call->count, call->request);
	_leave("");
}

/*
 * deliver request data to a CB.CallBack call
 */
static int afs_deliver_cb_callback(struct afs_call *call, struct sk_buff *skb,
				   bool last)
{
	struct afs_callback *cb;
	struct afs_server *server;
	struct in_addr addr;
	__be32 *bp;
	u32 tmp;
	int ret, loop;

	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);

	switch (call->unmarshall) {
	case 0:
		call->offset = 0;
		call->unmarshall++;

		/* extract the FID array and its count in two steps */
	case 1:
		_debug("extract FID count");
		ret = afs_extract_data(call, skb, last, &call->tmp, 4);
		switch (ret) {
		case 0:		break;
		case -EAGAIN:	return 0;
		default:	return ret;
		}

		call->count = ntohl(call->tmp);
		_debug("FID count: %u", call->count);
		if (call->count > AFSCBMAX)
			return -EBADMSG;

		call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
		if (!call->buffer)
			return -ENOMEM;
		call->offset = 0;
		call->unmarshall++;

	case 2:
		_debug("extract FID array");
		ret = afs_extract_data(call, skb, last, call->buffer,
				       call->count * 3 * 4);
		switch (ret) {
		case 0:		break;
		case -EAGAIN:	return 0;
		default:	return ret;
		}

		_debug("unmarshall FID array");
		call->request = kcalloc(call->count,
					sizeof(struct afs_callback),
					GFP_KERNEL);
		if (!call->request)
			return -ENOMEM;

		cb = call->request;
		bp = call->buffer;
		for (loop = call->count; loop > 0; loop--, cb++) {
			cb->fid.vid	= ntohl(*bp++);
			cb->fid.vnode	= ntohl(*bp++);
			cb->fid.unique	= ntohl(*bp++);
			cb->type	= AFSCM_CB_UNTYPED;
		}

		call->offset = 0;
		call->unmarshall++;

		/* extract the callback array and its count in two steps */
	case 3:
		_debug("extract CB count");
		ret = afs_extract_data(call, skb, last, &call->tmp, 4);
		switch (ret) {
		case 0:		break;
		case -EAGAIN:	return 0;
		default:	return ret;
		}

		tmp = ntohl(call->tmp);
		_debug("CB count: %u", tmp);
		if (tmp != call->count && tmp != 0)
			return -EBADMSG;
		call->offset = 0;
		call->unmarshall++;
		if (tmp == 0)
			goto empty_cb_array;

	case 4:
		_debug("extract CB array");
		ret = afs_extract_data(call, skb, last, call->request,
				       call->count * 3 * 4);
		switch (ret) {
		case 0:		break;
		case -EAGAIN:	return 0;
		default:	return ret;
		}

		_debug("unmarshall CB array");
		cb = call->request;
		bp = call->buffer;
		for (loop = call->count; loop > 0; loop--, cb++) {
			cb->version	= ntohl(*bp++);
			cb->expiry	= ntohl(*bp++);
			cb->type	= ntohl(*bp++);
		}

	empty_cb_array:
		call->offset = 0;
		call->unmarshall++;

	case 5:
		_debug("trailer");
		if (skb->len != 0)
			return -EBADMSG;
		break;
	}

	if (!last)
		return 0;

	call->state = AFS_CALL_REPLYING;

	/* we'll need the file server record as that tells us which set of
	 * vnodes to operate upon */
	memcpy(&addr, &ip_hdr(skb)->saddr, 4);
	server = afs_find_server(&addr);
	if (!server)
		return -ENOTCONN;
	call->server = server;

	INIT_WORK(&call->work, SRXAFSCB_CallBack);
	schedule_work(&call->work);
	return 0;
}

/*
 * allow the fileserver to request callback state (re-)initialisation
 */
static void SRXAFSCB_InitCallBackState(struct work_struct *work)
{
	struct afs_call *call = container_of(work, struct afs_call, work);

	_enter("{%p}", call->server);

	afs_init_callback_state(call->server);
	afs_send_empty_reply(call);
	_leave("");
}

/*
 * deliver request data to a CB.InitCallBackState call
 */
static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
					       struct sk_buff *skb,
					       bool last)
{
	struct afs_server *server;
	struct in_addr addr;

	_enter(",{%u},%d", skb->len, last);

	if (skb->len > 0)
		return -EBADMSG;
	if (!last)
		return 0;

	/* 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 */
	memcpy(&addr, &ip_hdr(skb)->saddr, 4);
	server = afs_find_server(&addr);
	if (!server)
		return -ENOTCONN;
	call->server = server;

	INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
	schedule_work(&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, struct sk_buff *skb,
				bool last)
{
	_enter(",{%u},%d", skb->len, last);

	if (skb->len > 0)
		return -EBADMSG;
	if (!last)
		return 0;

	/* no unmarshalling required */
	call->state = AFS_CALL_REPLYING;

	INIT_WORK(&call->work, SRXAFSCB_Probe);
	schedule_work(&call->work);
	return 0;
}

/*
 * allow the fileserver to ask about the cache manager's capabilities
 */
static void SRXAFSCB_GetCapabilities(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);
		}
	}

	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.GetCapabilities call
 */
static int afs_deliver_cb_get_capabilities(struct afs_call *call,
					   struct sk_buff *skb, bool last)
{
	_enter(",{%u},%d", skb->len, last);

	if (skb->len > 0)
		return -EBADMSG;
	if (!last)
		return 0;

	/* no unmarshalling required */
	call->state = AFS_CALL_REPLYING;

	INIT_WORK(&call->work, SRXAFSCB_GetCapabilities);
	schedule_work(&call->work);
	return 0;
}
Commit	Line	Data
ec26815a	1	/* AFS Cache Manager Service
1da177e4 LT	2	*
	3	* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/sched.h>
08e0e7c8	15	#include <linux/ip.h>
1da177e4	16	#include "internal.h"
08e0e7c8	17	#include "afs_cm.h"
1da177e4	18
08e0e7c8	19	struct workqueue_struct *afs_cm_workqueue;
1da177e4	20
08e0e7c8 DH	21	static int afs_deliver_cb_init_call_back_state(struct afs_call *,
	22	struct sk_buff *, bool);
	23	static int afs_deliver_cb_probe(struct afs_call , struct sk_buff , bool);
	24	static int afs_deliver_cb_callback(struct afs_call , struct sk_buff , bool);
b908fe6b DH	25	static int afs_deliver_cb_get_capabilities(struct afs_call , struct sk_buff ,
b908fe6b DH	26	bool);
08e0e7c8	27	static void afs_cm_destructor(struct afs_call *);
1da177e4	28
1da177e4	29	/*
08e0e7c8	30	* CB.CallBack operation type
1da177e4	31	*/
08e0e7c8	32	static const struct afs_call_type afs_SRXCBCallBack = {
00d3b7a4	33	.name = "CB.CallBack",
08e0e7c8 DH	34	.deliver = afs_deliver_cb_callback,
	35	.abort_to_error = afs_abort_to_error,
	36	.destructor = afs_cm_destructor,
	37	};
1da177e4	38
1da177e4	39	/*
08e0e7c8	40	* CB.InitCallBackState operation type
1da177e4	41	*/
08e0e7c8	42	static const struct afs_call_type afs_SRXCBInitCallBackState = {
00d3b7a4	43	.name = "CB.InitCallBackState",
08e0e7c8 DH	44	.deliver = afs_deliver_cb_init_call_back_state,
	45	.abort_to_error = afs_abort_to_error,
	46	.destructor = afs_cm_destructor,
	47	};
1da177e4	48
1da177e4	49	/*
08e0e7c8	50	* CB.Probe operation type
1da177e4	51	*/
08e0e7c8	52	static const struct afs_call_type afs_SRXCBProbe = {
00d3b7a4	53	.name = "CB.Probe",
08e0e7c8 DH	54	.deliver = afs_deliver_cb_probe,
	55	.abort_to_error = afs_abort_to_error,
	56	.destructor = afs_cm_destructor,
	57	};
1da177e4	58
b908fe6b DH	59	/*
	60	* CB.GetCapabilities operation type
	61	*/
	62	static const struct afs_call_type afs_SRXCBGetCapabilites = {
	63	.name = "CB.GetCapabilities",
	64	.deliver = afs_deliver_cb_get_capabilities,
	65	.abort_to_error = afs_abort_to_error,
	66	.destructor = afs_cm_destructor,
	67	};
	68
1da177e4	69	/*
08e0e7c8 DH	70	* route an incoming cache manager call
08e0e7c8 DH	71	* - return T if supported, F if not
1da177e4	72	*/
08e0e7c8	73	bool afs_cm_incoming_call(struct afs_call *call)
1da177e4	74	{
08e0e7c8 DH	75	u32 operation_id = ntohl(call->operation_ID);
	76
	77	_enter("{CB.OP %u}", operation_id);
	78
	79	switch (operation_id) {
	80	case CBCallBack:
	81	call->type = &afs_SRXCBCallBack;
	82	return true;
	83	case CBInitCallBackState:
	84	call->type = &afs_SRXCBInitCallBackState;
	85	return true;
	86	case CBProbe:
	87	call->type = &afs_SRXCBProbe;
	88	return true;
b908fe6b DH	89	case CBGetCapabilities:
	90	call->type = &afs_SRXCBGetCapabilites;
	91	return true;
08e0e7c8 DH	92	default:
08e0e7c8 DH	93	return false;
1da177e4	94	}
ec26815a	95	}
1da177e4	96
1da177e4	97	/*
08e0e7c8	98	* clean up a cache manager call
1da177e4	99	*/
08e0e7c8	100	static void afs_cm_destructor(struct afs_call *call)
1da177e4	101	{
08e0e7c8 DH	102	_enter("");
	103
	104	afs_put_server(call->server);
	105	call->server = NULL;
	106	kfree(call->buffer);
	107	call->buffer = NULL;
ec26815a	108	}
1da177e4	109
1da177e4	110	/*
08e0e7c8	111	* allow the fileserver to see if the cache manager is still alive
1da177e4	112	*/
08e0e7c8	113	static void SRXAFSCB_CallBack(struct work_struct *work)
1da177e4	114	{
08e0e7c8	115	struct afs_call *call = container_of(work, struct afs_call, work);
1da177e4	116
08e0e7c8	117	_enter("");
1da177e4	118
08e0e7c8 DH	119	/* be sure to send the reply before attempting to spam the AFS server
	120	* with FSFetchStatus requests on the vnodes with broken callbacks lest
	121	* the AFS server get into a vicious cycle of trying to break further
	122	* callbacks because it hadn't received completion of the CBCallBack op
	123	* yet */
	124	afs_send_empty_reply(call);
1da177e4	125
08e0e7c8 DH	126	afs_break_callbacks(call->server, call->count, call->request);
08e0e7c8 DH	127	_leave("");
ec26815a	128	}
1da177e4	129
1da177e4	130	/*
08e0e7c8	131	* deliver request data to a CB.CallBack call
1da177e4	132	*/
08e0e7c8 DH	133	static int afs_deliver_cb_callback(struct afs_call call, struct sk_buff skb,
08e0e7c8 DH	134	bool last)
1da177e4	135	{
08e0e7c8 DH	136	struct afs_callback *cb;
	137	struct afs_server *server;
	138	struct in_addr addr;
	139	__be32 *bp;
	140	u32 tmp;
	141	int ret, loop;
	142
	143	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
	144
	145	switch (call->unmarshall) {
	146	case 0:
	147	call->offset = 0;
	148	call->unmarshall++;
	149
	150	/* extract the FID array and its count in two steps */
	151	case 1:
	152	_debug("extract FID count");
	153	ret = afs_extract_data(call, skb, last, &call->tmp, 4);
	154	switch (ret) {
	155	case 0: break;
	156	case -EAGAIN: return 0;
	157	default: return ret;
1da177e4	158	}
1da177e4	159
08e0e7c8 DH	160	call->count = ntohl(call->tmp);
	161	_debug("FID count: %u", call->count);
	162	if (call->count > AFSCBMAX)
	163	return -EBADMSG;
	164
	165	call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
	166	if (!call->buffer)
	167	return -ENOMEM;
	168	call->offset = 0;
	169	call->unmarshall++;
	170
	171	case 2:
	172	_debug("extract FID array");
	173	ret = afs_extract_data(call, skb, last, call->buffer,
	174	call->count * 3 * 4);
	175	switch (ret) {
	176	case 0: break;
	177	case -EAGAIN: return 0;
	178	default: return ret;
1da177e4	179	}
1da177e4	180
08e0e7c8 DH	181	_debug("unmarshall FID array");
	182	call->request = kcalloc(call->count,
	183	sizeof(struct afs_callback),
	184	GFP_KERNEL);
	185	if (!call->request)
	186	return -ENOMEM;
	187
	188	cb = call->request;
	189	bp = call->buffer;
	190	for (loop = call->count; loop > 0; loop--, cb++) {
	191	cb->fid.vid = ntohl(*bp++);
	192	cb->fid.vnode = ntohl(*bp++);
	193	cb->fid.unique = ntohl(*bp++);
	194	cb->type = AFSCM_CB_UNTYPED;
1da177e4 LT	195	}
1da177e4 LT	196
08e0e7c8 DH	197	call->offset = 0;
	198	call->unmarshall++;
	199
	200	/* extract the callback array and its count in two steps */
	201	case 3:
	202	_debug("extract CB count");
	203	ret = afs_extract_data(call, skb, last, &call->tmp, 4);
	204	switch (ret) {
	205	case 0: break;
	206	case -EAGAIN: return 0;
	207	default: return ret;
	208	}
1da177e4	209
08e0e7c8 DH	210	tmp = ntohl(call->tmp);
	211	_debug("CB count: %u", tmp);
	212	if (tmp != call->count && tmp != 0)
	213	return -EBADMSG;
	214	call->offset = 0;
	215	call->unmarshall++;
	216	if (tmp == 0)
	217	goto empty_cb_array;
	218
	219	case 4:
	220	_debug("extract CB array");
	221	ret = afs_extract_data(call, skb, last, call->request,
	222	call->count * 3 * 4);
	223	switch (ret) {
	224	case 0: break;
	225	case -EAGAIN: return 0;
	226	default: return ret;
1da177e4	227	}
1da177e4	228
08e0e7c8 DH	229	_debug("unmarshall CB array");
	230	cb = call->request;
	231	bp = call->buffer;
	232	for (loop = call->count; loop > 0; loop--, cb++) {
	233	cb->version = ntohl(*bp++);
	234	cb->expiry = ntohl(*bp++);
	235	cb->type = ntohl(*bp++);
	236	}
1da177e4	237
08e0e7c8 DH	238	empty_cb_array:
	239	call->offset = 0;
	240	call->unmarshall++;
1da177e4	241
08e0e7c8 DH	242	case 5:
	243	_debug("trailer");
	244	if (skb->len != 0)
	245	return -EBADMSG;
1da177e4 LT	246	break;
	247	}
	248
08e0e7c8 DH	249	if (!last)
08e0e7c8 DH	250	return 0;
1da177e4	251
08e0e7c8	252	call->state = AFS_CALL_REPLYING;
1da177e4	253
08e0e7c8 DH	254	/* we'll need the file server record as that tells us which set of
	255	* vnodes to operate upon */
	256	memcpy(&addr, &ip_hdr(skb)->saddr, 4);
	257	server = afs_find_server(&addr);
	258	if (!server)
	259	return -ENOTCONN;
	260	call->server = server;
	261
	262	INIT_WORK(&call->work, SRXAFSCB_CallBack);
	263	schedule_work(&call->work);
	264	return 0;
ec26815a	265	}
1da177e4	266
1da177e4	267	/*
08e0e7c8	268	* allow the fileserver to request callback state (re-)initialisation
1da177e4	269	*/
08e0e7c8	270	static void SRXAFSCB_InitCallBackState(struct work_struct *work)
1da177e4	271	{
08e0e7c8	272	struct afs_call *call = container_of(work, struct afs_call, work);
1da177e4	273
08e0e7c8	274	_enter("{%p}", call->server);
1da177e4	275
08e0e7c8 DH	276	afs_init_callback_state(call->server);
	277	afs_send_empty_reply(call);
	278	_leave("");
ec26815a	279	}
1da177e4	280
1da177e4	281	/*
08e0e7c8	282	* deliver request data to a CB.InitCallBackState call
1da177e4	283	*/
08e0e7c8 DH	284	static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
	285	struct sk_buff *skb,
	286	bool last)
1da177e4 LT	287	{
1da177e4 LT	288	struct afs_server *server;
08e0e7c8	289	struct in_addr addr;
1da177e4	290
08e0e7c8	291	_enter(",{%u},%d", skb->len, last);
1da177e4	292
08e0e7c8 DH	293	if (skb->len > 0)
	294	return -EBADMSG;
	295	if (!last)
	296	return 0;
1da177e4	297
08e0e7c8 DH	298	/* no unmarshalling required */
08e0e7c8 DH	299	call->state = AFS_CALL_REPLYING;
1da177e4	300
08e0e7c8 DH	301	/* we'll need the file server record as that tells us which set of
	302	* vnodes to operate upon */
	303	memcpy(&addr, &ip_hdr(skb)->saddr, 4);
	304	server = afs_find_server(&addr);
	305	if (!server)
	306	return -ENOTCONN;
	307	call->server = server;
1da177e4	308
08e0e7c8 DH	309	INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
	310	schedule_work(&call->work);
	311	return 0;
	312	}
1da177e4	313
08e0e7c8 DH	314	/*
	315	* allow the fileserver to see if the cache manager is still alive
	316	*/
	317	static void SRXAFSCB_Probe(struct work_struct *work)
	318	{
	319	struct afs_call *call = container_of(work, struct afs_call, work);
1da177e4	320
08e0e7c8 DH	321	_enter("");
	322	afs_send_empty_reply(call);
	323	_leave("");
	324	}
1da177e4	325
08e0e7c8 DH	326	/*
	327	* deliver request data to a CB.Probe call
	328	*/
	329	static int afs_deliver_cb_probe(struct afs_call call, struct sk_buff skb,
	330	bool last)
	331	{
	332	_enter(",{%u},%d", skb->len, last);
1da177e4	333
08e0e7c8 DH	334	if (skb->len > 0)
	335	return -EBADMSG;
	336	if (!last)
	337	return 0;
1da177e4	338
08e0e7c8 DH	339	/* no unmarshalling required */
08e0e7c8 DH	340	call->state = AFS_CALL_REPLYING;
1da177e4	341
08e0e7c8 DH	342	INIT_WORK(&call->work, SRXAFSCB_Probe);
	343	schedule_work(&call->work);
	344	return 0;
ec26815a	345	}
b908fe6b DH	346
	347	/*
	348	* allow the fileserver to ask about the cache manager's capabilities
	349	*/
	350	static void SRXAFSCB_GetCapabilities(struct work_struct *work)
	351	{
	352	struct afs_interface *ifs;
	353	struct afs_call *call = container_of(work, struct afs_call, work);
	354	int loop, nifs;
	355
	356	struct {
	357	struct /* InterfaceAddr */ {
	358	__be32 nifs;
	359	__be32 uuid[11];
	360	__be32 ifaddr[32];
	361	__be32 netmask[32];
	362	__be32 mtu[32];
	363	} ia;
	364	struct /* Capabilities */ {
	365	__be32 capcount;
	366	__be32 caps[1];
	367	} cap;
	368	} reply;
	369
	370	_enter("");
	371
	372	nifs = 0;
	373	ifs = kcalloc(32, sizeof(*ifs), GFP_KERNEL);
	374	if (ifs) {
	375	nifs = afs_get_ipv4_interfaces(ifs, 32, false);
	376	if (nifs < 0) {
	377	kfree(ifs);
	378	ifs = NULL;
	379	nifs = 0;
	380	}
	381	}
	382
	383	memset(&reply, 0, sizeof(reply));
	384	reply.ia.nifs = htonl(nifs);
	385
	386	reply.ia.uuid[0] = htonl(afs_uuid.time_low);
	387	reply.ia.uuid[1] = htonl(afs_uuid.time_mid);
	388	reply.ia.uuid[2] = htonl(afs_uuid.time_hi_and_version);
	389	reply.ia.uuid[3] = htonl((s8) afs_uuid.clock_seq_hi_and_reserved);
	390	reply.ia.uuid[4] = htonl((s8) afs_uuid.clock_seq_low);
	391	for (loop = 0; loop < 6; loop++)
	392	reply.ia.uuid[loop + 5] = htonl((s8) afs_uuid.node[loop]);
	393
	394	if (ifs) {
	395	for (loop = 0; loop < nifs; loop++) {
	396	reply.ia.ifaddr[loop] = ifs[loop].address.s_addr;
	397	reply.ia.netmask[loop] = ifs[loop].netmask.s_addr;
	398	reply.ia.mtu[loop] = htonl(ifs[loop].mtu);
	399	}
	400	}
	401
	402	reply.cap.capcount = htonl(1);
	403	reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
	404	afs_send_simple_reply(call, &reply, sizeof(reply));
	405
	406	_leave("");
	407	}
	408
	409	/*
410	* deliver request data to a CB.GetCapabilities call
411	*/
412	static int afs_deliver_cb_get_capabilities(struct afs_call *call,
413	struct sk_buff *skb, bool last)
414	{
415	_enter(",{%u},%d", skb->len, last);
416
417	if (skb->len > 0)
418	return -EBADMSG;
419	if (!last)
420	return 0;
421
422	/* no unmarshalling required */
423	call->state = AFS_CALL_REPLYING;
424
425	INIT_WORK(&call->work, SRXAFSCB_GetCapabilities);
426	schedule_work(&call->work);
427	return 0;
428	}