Initial import

1 files changed, 604 insertions, 0 deletions

diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
new file mode 100644
index 000000000..4b0eff6da
--- /dev/null
+++ b/fs/afs/cmservice.c
@@ -0,0 +1,604 @@
+/* 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/slab.h>
+#include <linux/sched.h>
+#include <linux/ip.h>
+#include "internal.h"
+#include "afs_cm.h"
+
+#if 0
+struct workqueue_struct *afs_cm_workqueue;
+#endif  /*  0  */
+
+static int afs_deliver_cb_init_call_back_state(struct afs_call *,
+					       struct sk_buff *, bool);
+static int afs_deliver_cb_init_call_back_state3(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_probe_uuid(struct afs_call *, struct sk_buff *, bool);
+static int afs_deliver_cb_tell_me_about_yourself(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.InitCallBackState3 operation type
+ */
+static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
+	.name		= "CB.InitCallBackState3",
+	.deliver	= afs_deliver_cb_init_call_back_state3,
+	.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.ProbeUuid operation type
+ */
+static const struct afs_call_type afs_SRXCBProbeUuid = {
+	.name		= "CB.ProbeUuid",
+	.deliver	= afs_deliver_cb_probe_uuid,
+	.abort_to_error	= afs_abort_to_error,
+	.destructor	= afs_cm_destructor,
+};
+
+/*
+ * CB.TellMeAboutYourself operation type
+ */
+static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
+	.name		= "CB.TellMeAboutYourself",
+	.deliver	= afs_deliver_cb_tell_me_about_yourself,
+	.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 CBInitCallBackState3:
+		call->type = &afs_SRXCBInitCallBackState3;
+		return true;
+	case CBProbe:
+		call->type = &afs_SRXCBProbe;
+		return true;
+	case CBTellMeAboutYourself:
+		call->type = &afs_SRXCBTellMeAboutYourself;
+		return true;
+	default:
+		return false;
+	}
+}
+
+/*
+ * clean up a cache manager call
+ */
+static void afs_cm_destructor(struct afs_call *call)
+{
+	_enter("");
+
+	/* Break the callbacks here so that we do it after the final ACK is
+	 * received.  The step number here must match the final number in
+	 * afs_deliver_cb_callback().
+	 */
+	if (call->unmarshall == 6) {
+		ASSERT(call->server && call->count && call->request);
+		afs_break_callbacks(call->server, call->count, call->request);
+	}
+
+	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;
+
+		/* Record that the message was unmarshalled successfully so
+		 * that the call destructor can know do the callback breaking
+		 * work, even if the final ACK isn't received.
+		 *
+		 * If the step number changes, then afs_cm_destructor() must be
+		 * updated also.
+		 */
+		call->unmarshall++;
+	case 6:
+		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);
+	queue_work(afs_wq, &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);
+	queue_work(afs_wq, &call->work);
+	return 0;
+}
+
+/*
+ * deliver request data to a CB.InitCallBackState3 call
+ */
+static int afs_deliver_cb_init_call_back_state3(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 (!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);
+	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, 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);
+	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 sk_buff *skb,
+				     bool last)
+{
+	struct afs_uuid *r;
+	unsigned loop;
+	__be32 *b;
+	int ret;
+
+	_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
+
+	if (skb->len > 0)
+		return -EBADMSG;
+	if (!last)
+		return 0;
+
+	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, skb, last, call->buffer,
+				       11 * sizeof(__be32));
+		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:
+		_debug("trailer");
+		if (skb->len != 0)
+			return -EBADMSG;
+		break;
+	}
+
+	if (!last)
+		return 0;
+
+	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,
+						 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_TellMeAboutYourself);
+	queue_work(afs_wq, &call->work);
+	return 0;
+}