[mirror_ubuntu-zesty-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 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,
};

/*
 * 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;
	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;
}
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);
	25	static void afs_cm_destructor(struct afs_call *);
1da177e4	26
1da177e4	27	/*
08e0e7c8	28	* CB.CallBack operation type
1da177e4	29	*/
08e0e7c8	30	static const struct afs_call_type afs_SRXCBCallBack = {
00d3b7a4	31	.name = "CB.CallBack",
08e0e7c8 DH	32	.deliver = afs_deliver_cb_callback,
	33	.abort_to_error = afs_abort_to_error,
	34	.destructor = afs_cm_destructor,
	35	};
1da177e4	36
1da177e4	37	/*
08e0e7c8	38	* CB.InitCallBackState operation type
1da177e4	39	*/
08e0e7c8	40	static const struct afs_call_type afs_SRXCBInitCallBackState = {
00d3b7a4	41	.name = "CB.InitCallBackState",
08e0e7c8 DH	42	.deliver = afs_deliver_cb_init_call_back_state,
	43	.abort_to_error = afs_abort_to_error,
	44	.destructor = afs_cm_destructor,
	45	};
1da177e4	46
1da177e4	47	/*
08e0e7c8	48	* CB.Probe operation type
1da177e4	49	*/
08e0e7c8	50	static const struct afs_call_type afs_SRXCBProbe = {
00d3b7a4	51	.name = "CB.Probe",
08e0e7c8 DH	52	.deliver = afs_deliver_cb_probe,
	53	.abort_to_error = afs_abort_to_error,
	54	.destructor = afs_cm_destructor,
	55	};
1da177e4	56
1da177e4	57	/*
08e0e7c8 DH	58	* route an incoming cache manager call
08e0e7c8 DH	59	* - return T if supported, F if not
1da177e4	60	*/
08e0e7c8	61	bool afs_cm_incoming_call(struct afs_call *call)
1da177e4	62	{
08e0e7c8 DH	63	u32 operation_id = ntohl(call->operation_ID);
	64
	65	_enter("{CB.OP %u}", operation_id);
	66
	67	switch (operation_id) {
	68	case CBCallBack:
	69	call->type = &afs_SRXCBCallBack;
	70	return true;
	71	case CBInitCallBackState:
	72	call->type = &afs_SRXCBInitCallBackState;
	73	return true;
	74	case CBProbe:
	75	call->type = &afs_SRXCBProbe;
	76	return true;
	77	default:
	78	return false;
1da177e4	79	}
ec26815a	80	}
1da177e4	81
1da177e4	82	/*
08e0e7c8	83	* clean up a cache manager call
1da177e4	84	*/
08e0e7c8	85	static void afs_cm_destructor(struct afs_call *call)
1da177e4	86	{
08e0e7c8 DH	87	_enter("");
	88
	89	afs_put_server(call->server);
	90	call->server = NULL;
	91	kfree(call->buffer);
	92	call->buffer = NULL;
ec26815a	93	}
1da177e4	94
1da177e4	95	/*
08e0e7c8	96	* allow the fileserver to see if the cache manager is still alive
1da177e4	97	*/
08e0e7c8	98	static void SRXAFSCB_CallBack(struct work_struct *work)
1da177e4	99	{
08e0e7c8	100	struct afs_call *call = container_of(work, struct afs_call, work);
1da177e4	101
08e0e7c8	102	_enter("");
1da177e4	103
08e0e7c8 DH	104	/* be sure to send the reply before attempting to spam the AFS server
	105	* with FSFetchStatus requests on the vnodes with broken callbacks lest
	106	* the AFS server get into a vicious cycle of trying to break further
	107	* callbacks because it hadn't received completion of the CBCallBack op
	108	* yet */
	109	afs_send_empty_reply(call);
1da177e4	110
08e0e7c8 DH	111	afs_break_callbacks(call->server, call->count, call->request);
08e0e7c8 DH	112	_leave("");
ec26815a	113	}
1da177e4	114
1da177e4	115	/*
08e0e7c8	116	* deliver request data to a CB.CallBack call
1da177e4	117	*/
08e0e7c8 DH	118	static int afs_deliver_cb_callback(struct afs_call call, struct sk_buff skb,
08e0e7c8 DH	119	bool last)
1da177e4	120	{
08e0e7c8 DH	121	struct afs_callback *cb;
	122	struct afs_server *server;
	123	struct in_addr addr;
	124	__be32 *bp;
	125	u32 tmp;
	126	int ret, loop;
	127
	128	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
	129
	130	switch (call->unmarshall) {
	131	case 0:
	132	call->offset = 0;
	133	call->unmarshall++;
	134
	135	/* extract the FID array and its count in two steps */
	136	case 1:
	137	_debug("extract FID count");
	138	ret = afs_extract_data(call, skb, last, &call->tmp, 4);
	139	switch (ret) {
	140	case 0: break;
	141	case -EAGAIN: return 0;
	142	default: return ret;
1da177e4	143	}
1da177e4	144
08e0e7c8 DH	145	call->count = ntohl(call->tmp);
	146	_debug("FID count: %u", call->count);
	147	if (call->count > AFSCBMAX)
	148	return -EBADMSG;
	149
	150	call->buffer = kmalloc(call->count * 3 * 4, GFP_KERNEL);
	151	if (!call->buffer)
	152	return -ENOMEM;
	153	call->offset = 0;
	154	call->unmarshall++;
	155
	156	case 2:
	157	_debug("extract FID array");
	158	ret = afs_extract_data(call, skb, last, call->buffer,
	159	call->count * 3 * 4);
	160	switch (ret) {
	161	case 0: break;
	162	case -EAGAIN: return 0;
	163	default: return ret;
1da177e4	164	}
1da177e4	165
08e0e7c8 DH	166	_debug("unmarshall FID array");
	167	call->request = kcalloc(call->count,
	168	sizeof(struct afs_callback),
	169	GFP_KERNEL);
	170	if (!call->request)
	171	return -ENOMEM;
	172
	173	cb = call->request;
	174	bp = call->buffer;
	175	for (loop = call->count; loop > 0; loop--, cb++) {
	176	cb->fid.vid = ntohl(*bp++);
	177	cb->fid.vnode = ntohl(*bp++);
	178	cb->fid.unique = ntohl(*bp++);
	179	cb->type = AFSCM_CB_UNTYPED;
1da177e4 LT	180	}
1da177e4 LT	181
08e0e7c8 DH	182	call->offset = 0;
	183	call->unmarshall++;
	184
	185	/* extract the callback array and its count in two steps */
	186	case 3:
	187	_debug("extract CB count");
	188	ret = afs_extract_data(call, skb, last, &call->tmp, 4);
	189	switch (ret) {
	190	case 0: break;
	191	case -EAGAIN: return 0;
	192	default: return ret;
	193	}
1da177e4	194
08e0e7c8 DH	195	tmp = ntohl(call->tmp);
	196	_debug("CB count: %u", tmp);
	197	if (tmp != call->count && tmp != 0)
	198	return -EBADMSG;
	199	call->offset = 0;
	200	call->unmarshall++;
	201	if (tmp == 0)
	202	goto empty_cb_array;
	203
	204	case 4:
	205	_debug("extract CB array");
	206	ret = afs_extract_data(call, skb, last, call->request,
	207	call->count * 3 * 4);
	208	switch (ret) {
	209	case 0: break;
	210	case -EAGAIN: return 0;
	211	default: return ret;
1da177e4	212	}
1da177e4	213
08e0e7c8 DH	214	_debug("unmarshall CB array");
	215	cb = call->request;
	216	bp = call->buffer;
	217	for (loop = call->count; loop > 0; loop--, cb++) {
	218	cb->version = ntohl(*bp++);
	219	cb->expiry = ntohl(*bp++);
	220	cb->type = ntohl(*bp++);
	221	}
1da177e4	222
08e0e7c8 DH	223	empty_cb_array:
	224	call->offset = 0;
	225	call->unmarshall++;
1da177e4	226
08e0e7c8 DH	227	case 5:
	228	_debug("trailer");
	229	if (skb->len != 0)
	230	return -EBADMSG;
1da177e4 LT	231	break;
	232	}
	233
08e0e7c8 DH	234	if (!last)
08e0e7c8 DH	235	return 0;
1da177e4	236
08e0e7c8	237	call->state = AFS_CALL_REPLYING;
1da177e4	238
08e0e7c8 DH	239	/* we'll need the file server record as that tells us which set of
	240	* vnodes to operate upon */
	241	memcpy(&addr, &ip_hdr(skb)->saddr, 4);
	242	server = afs_find_server(&addr);
	243	if (!server)
	244	return -ENOTCONN;
	245	call->server = server;
	246
	247	INIT_WORK(&call->work, SRXAFSCB_CallBack);
	248	schedule_work(&call->work);
	249	return 0;
ec26815a	250	}
1da177e4	251
1da177e4	252	/*
08e0e7c8	253	* allow the fileserver to request callback state (re-)initialisation
1da177e4	254	*/
08e0e7c8	255	static void SRXAFSCB_InitCallBackState(struct work_struct *work)
1da177e4	256	{
08e0e7c8	257	struct afs_call *call = container_of(work, struct afs_call, work);
1da177e4	258
08e0e7c8	259	_enter("{%p}", call->server);
1da177e4	260
08e0e7c8 DH	261	afs_init_callback_state(call->server);
	262	afs_send_empty_reply(call);
	263	_leave("");
ec26815a	264	}
1da177e4	265
1da177e4	266	/*
08e0e7c8	267	* deliver request data to a CB.InitCallBackState call
1da177e4	268	*/
08e0e7c8 DH	269	static int afs_deliver_cb_init_call_back_state(struct afs_call *call,
	270	struct sk_buff *skb,
	271	bool last)
1da177e4 LT	272	{
1da177e4 LT	273	struct afs_server *server;
08e0e7c8	274	struct in_addr addr;
1da177e4	275
08e0e7c8	276	_enter(",{%u},%d", skb->len, last);
1da177e4	277
08e0e7c8 DH	278	if (skb->len > 0)
	279	return -EBADMSG;
	280	if (!last)
	281	return 0;
1da177e4	282
08e0e7c8 DH	283	/* no unmarshalling required */
08e0e7c8 DH	284	call->state = AFS_CALL_REPLYING;
1da177e4	285
08e0e7c8 DH	286	/* we'll need the file server record as that tells us which set of
	287	* vnodes to operate upon */
	288	memcpy(&addr, &ip_hdr(skb)->saddr, 4);
	289	server = afs_find_server(&addr);
	290	if (!server)
	291	return -ENOTCONN;
	292	call->server = server;
1da177e4	293
08e0e7c8 DH	294	INIT_WORK(&call->work, SRXAFSCB_InitCallBackState);
	295	schedule_work(&call->work);
	296	return 0;
	297	}
1da177e4	298
08e0e7c8 DH	299	/*
	300	* allow the fileserver to see if the cache manager is still alive
	301	*/
	302	static void SRXAFSCB_Probe(struct work_struct *work)
	303	{
	304	struct afs_call *call = container_of(work, struct afs_call, work);
1da177e4	305
08e0e7c8 DH	306	_enter("");
	307	afs_send_empty_reply(call);
	308	_leave("");
	309	}
1da177e4	310
08e0e7c8 DH	311	/*
	312	* deliver request data to a CB.Probe call
	313	*/
	314	static int afs_deliver_cb_probe(struct afs_call call, struct sk_buff skb,
	315	bool last)
	316	{
	317	_enter(",{%u},%d", skb->len, last);
1da177e4	318
08e0e7c8 DH	319	if (skb->len > 0)
	320	return -EBADMSG;
	321	if (!last)
	322	return 0;
1da177e4	323
08e0e7c8 DH	324	/* no unmarshalling required */
08e0e7c8 DH	325	call->state = AFS_CALL_REPLYING;
1da177e4	326
08e0e7c8 DH	327	INIT_WORK(&call->work, SRXAFSCB_Probe);
	328	schedule_work(&call->work);
	329	return 0;
ec26815a	330	}