Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 652 insertions, 0 deletions

diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c
new file mode 100644
index 0000000..0a57fd7
--- /dev/null
+++ b/fs/afs/cmservice.c
@@ -0,0 +1,652 @@
+/* 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/completion.h>
+#include "server.h"
+#include "cell.h"
+#include "transport.h"
+#include <rxrpc/rxrpc.h>
+#include <rxrpc/transport.h>
+#include <rxrpc/connection.h>
+#include <rxrpc/call.h>
+#include "cmservice.h"
+#include "internal.h"
+
+static unsigned afscm_usage;		/* AFS cache manager usage count */
+static struct rw_semaphore afscm_sem;	/* AFS cache manager start/stop semaphore */
+
+static int afscm_new_call(struct rxrpc_call *call);
+static void afscm_attention(struct rxrpc_call *call);
+static void afscm_error(struct rxrpc_call *call);
+static void afscm_aemap(struct rxrpc_call *call);
+
+static void _SRXAFSCM_CallBack(struct rxrpc_call *call);
+static void _SRXAFSCM_InitCallBackState(struct rxrpc_call *call);
+static void _SRXAFSCM_Probe(struct rxrpc_call *call);
+
+typedef void (*_SRXAFSCM_xxxx_t)(struct rxrpc_call *call);
+
+static const struct rxrpc_operation AFSCM_ops[] = {
+	{
+		.id	= 204,
+		.asize	= RXRPC_APP_MARK_EOF,
+		.name	= "CallBack",
+		.user	= _SRXAFSCM_CallBack,
+	},
+	{
+		.id	= 205,
+		.asize	= RXRPC_APP_MARK_EOF,
+		.name	= "InitCallBackState",
+		.user	= _SRXAFSCM_InitCallBackState,
+	},
+	{
+		.id	= 206,
+		.asize	= RXRPC_APP_MARK_EOF,
+		.name	= "Probe",
+		.user	= _SRXAFSCM_Probe,
+	},
+#if 0
+	{
+		.id	= 207,
+		.asize	= RXRPC_APP_MARK_EOF,
+		.name	= "GetLock",
+		.user	= _SRXAFSCM_GetLock,
+	},
+	{
+		.id	= 208,
+		.asize	= RXRPC_APP_MARK_EOF,
+		.name	= "GetCE",
+		.user	= _SRXAFSCM_GetCE,
+	},
+	{
+		.id	= 209,
+		.asize	= RXRPC_APP_MARK_EOF,
+		.name	= "GetXStatsVersion",
+		.user	= _SRXAFSCM_GetXStatsVersion,
+	},
+	{
+		.id	= 210,
+		.asize	= RXRPC_APP_MARK_EOF,
+		.name	= "GetXStats",
+		.user	= _SRXAFSCM_GetXStats,
+	}
+#endif
+};
+
+static struct rxrpc_service AFSCM_service = {
+	.name		= "AFS/CM",
+	.owner		= THIS_MODULE,
+	.link		= LIST_HEAD_INIT(AFSCM_service.link),
+	.new_call	= afscm_new_call,
+	.service_id	= 1,
+	.attn_func	= afscm_attention,
+	.error_func	= afscm_error,
+	.aemap_func	= afscm_aemap,
+	.ops_begin	= &AFSCM_ops[0],
+	.ops_end	= &AFSCM_ops[sizeof(AFSCM_ops) / sizeof(AFSCM_ops[0])],
+};
+
+static DECLARE_COMPLETION(kafscmd_alive);
+static DECLARE_COMPLETION(kafscmd_dead);
+static DECLARE_WAIT_QUEUE_HEAD(kafscmd_sleepq);
+static LIST_HEAD(kafscmd_attention_list);
+static LIST_HEAD(afscm_calls);
+static DEFINE_SPINLOCK(afscm_calls_lock);
+static DEFINE_SPINLOCK(kafscmd_attention_lock);
+static int kafscmd_die;
+
+/*****************************************************************************/
+/*
+ * AFS Cache Manager kernel thread
+ */
+static int kafscmd(void *arg)
+{
+	DECLARE_WAITQUEUE(myself, current);
+
+	struct rxrpc_call *call;
+	_SRXAFSCM_xxxx_t func;
+	int die;
+
+	printk("kAFS: Started kafscmd %d\n", current->pid);
+
+	daemonize("kafscmd");
+
+	complete(&kafscmd_alive);
+
+	/* loop around looking for things to attend to */
+	do {
+		if (list_empty(&kafscmd_attention_list)) {
+			set_current_state(TASK_INTERRUPTIBLE);
+			add_wait_queue(&kafscmd_sleepq, &myself);
+
+			for (;;) {
+				set_current_state(TASK_INTERRUPTIBLE);
+				if (!list_empty(&kafscmd_attention_list) ||
+				    signal_pending(current) ||
+				    kafscmd_die)
+					break;
+
+				schedule();
+			}
+
+			remove_wait_queue(&kafscmd_sleepq, &myself);
+			set_current_state(TASK_RUNNING);
+		}
+
+		die = kafscmd_die;
+
+		/* dequeue the next call requiring attention */
+		call = NULL;
+		spin_lock(&kafscmd_attention_lock);
+
+		if (!list_empty(&kafscmd_attention_list)) {
+			call = list_entry(kafscmd_attention_list.next,
+					  struct rxrpc_call,
+					  app_attn_link);
+			list_del_init(&call->app_attn_link);
+			die = 0;
+		}
+
+		spin_unlock(&kafscmd_attention_lock);
+
+		if (call) {
+			/* act upon it */
+			_debug("@@@ Begin Attend Call %p", call);
+
+			func = call->app_user;
+			if (func)
+				func(call);
+
+			rxrpc_put_call(call);
+
+			_debug("@@@ End Attend Call %p", call);
+		}
+
+	} while(!die);
+
+	/* and that's all */
+	complete_and_exit(&kafscmd_dead, 0);
+
+} /* end kafscmd() */
+
+/*****************************************************************************/
+/*
+ * handle a call coming in to the cache manager
+ * - if I want to keep the call, I must increment its usage count
+ * - the return value will be negated and passed back in an abort packet if
+ *   non-zero
+ * - serialised by virtue of there only being one krxiod
+ */
+static int afscm_new_call(struct rxrpc_call *call)
+{
+	_enter("%p{cid=%u u=%d}",
+	       call, ntohl(call->call_id), atomic_read(&call->usage));
+
+	rxrpc_get_call(call);
+
+	/* add to my current call list */
+	spin_lock(&afscm_calls_lock);
+	list_add(&call->app_link,&afscm_calls);
+	spin_unlock(&afscm_calls_lock);
+
+	_leave(" = 0");
+	return 0;
+
+} /* end afscm_new_call() */
+
+/*****************************************************************************/
+/*
+ * queue on the kafscmd queue for attention
+ */
+static void afscm_attention(struct rxrpc_call *call)
+{
+	_enter("%p{cid=%u u=%d}",
+	       call, ntohl(call->call_id), atomic_read(&call->usage));
+
+	spin_lock(&kafscmd_attention_lock);
+
+	if (list_empty(&call->app_attn_link)) {
+		list_add_tail(&call->app_attn_link, &kafscmd_attention_list);
+		rxrpc_get_call(call);
+	}
+
+	spin_unlock(&kafscmd_attention_lock);
+
+	wake_up(&kafscmd_sleepq);
+
+	_leave(" {u=%d}", atomic_read(&call->usage));
+} /* end afscm_attention() */
+
+/*****************************************************************************/
+/*
+ * handle my call being aborted
+ * - clean up, dequeue and put my ref to the call
+ */
+static void afscm_error(struct rxrpc_call *call)
+{
+	int removed;
+
+	_enter("%p{est=%s ac=%u er=%d}",
+	       call,
+	       rxrpc_call_error_states[call->app_err_state],
+	       call->app_abort_code,
+	       call->app_errno);
+
+	spin_lock(&kafscmd_attention_lock);
+
+	if (list_empty(&call->app_attn_link)) {
+		list_add_tail(&call->app_attn_link, &kafscmd_attention_list);
+		rxrpc_get_call(call);
+	}
+
+	spin_unlock(&kafscmd_attention_lock);
+
+	removed = 0;
+	spin_lock(&afscm_calls_lock);
+	if (!list_empty(&call->app_link)) {
+		list_del_init(&call->app_link);
+		removed = 1;
+	}
+	spin_unlock(&afscm_calls_lock);
+
+	if (removed)
+		rxrpc_put_call(call);
+
+	wake_up(&kafscmd_sleepq);
+
+	_leave("");
+} /* end afscm_error() */
+
+/*****************************************************************************/
+/*
+ * map afs abort codes to/from Linux error codes
+ * - called with call->lock held
+ */
+static void afscm_aemap(struct rxrpc_call *call)
+{
+	switch (call->app_err_state) {
+	case RXRPC_ESTATE_LOCAL_ABORT:
+		call->app_abort_code = -call->app_errno;
+		break;
+	case RXRPC_ESTATE_PEER_ABORT:
+		call->app_errno = -ECONNABORTED;
+		break;
+	default:
+		break;
+	}
+} /* end afscm_aemap() */
+
+/*****************************************************************************/
+/*
+ * start the cache manager service if not already started
+ */
+int afscm_start(void)
+{
+	int ret;
+
+	down_write(&afscm_sem);
+	if (!afscm_usage) {
+		ret = kernel_thread(kafscmd, NULL, 0);
+		if (ret < 0)
+			goto out;
+
+		wait_for_completion(&kafscmd_alive);
+
+		ret = rxrpc_add_service(afs_transport, &AFSCM_service);
+		if (ret < 0)
+			goto kill;
+
+		afs_kafstimod_add_timer(&afs_mntpt_expiry_timer,
+					afs_mntpt_expiry_timeout * HZ);
+	}
+
+	afscm_usage++;
+	up_write(&afscm_sem);
+
+	return 0;
+
+ kill:
+	kafscmd_die = 1;
+	wake_up(&kafscmd_sleepq);
+	wait_for_completion(&kafscmd_dead);
+
+ out:
+	up_write(&afscm_sem);
+	return ret;
+
+} /* end afscm_start() */
+
+/*****************************************************************************/
+/*
+ * stop the cache manager service
+ */
+void afscm_stop(void)
+{
+	struct rxrpc_call *call;
+
+	down_write(&afscm_sem);
+
+	BUG_ON(afscm_usage == 0);
+	afscm_usage--;
+
+	if (afscm_usage == 0) {
+		/* don't want more incoming calls */
+		rxrpc_del_service(afs_transport, &AFSCM_service);
+
+		/* abort any calls I've still got open (the afscm_error() will
+		 * dequeue them) */
+		spin_lock(&afscm_calls_lock);
+		while (!list_empty(&afscm_calls)) {
+			call = list_entry(afscm_calls.next,
+					  struct rxrpc_call,
+					  app_link);
+
+			list_del_init(&call->app_link);
+			rxrpc_get_call(call);
+			spin_unlock(&afscm_calls_lock);
+
+			rxrpc_call_abort(call, -ESRCH); /* abort, dequeue and
+							 * put */
+
+			_debug("nuking active call %08x.%d",
+			       ntohl(call->conn->conn_id),
+			       ntohl(call->call_id));
+			rxrpc_put_call(call);
+			rxrpc_put_call(call);
+
+			spin_lock(&afscm_calls_lock);
+		}
+		spin_unlock(&afscm_calls_lock);
+
+		/* get rid of my daemon */
+		kafscmd_die = 1;
+		wake_up(&kafscmd_sleepq);
+		wait_for_completion(&kafscmd_dead);
+
+		/* dispose of any calls waiting for attention */
+		spin_lock(&kafscmd_attention_lock);
+		while (!list_empty(&kafscmd_attention_list)) {
+			call = list_entry(kafscmd_attention_list.next,
+					  struct rxrpc_call,
+					  app_attn_link);
+
+			list_del_init(&call->app_attn_link);
+			spin_unlock(&kafscmd_attention_lock);
+
+			rxrpc_put_call(call);
+
+			spin_lock(&kafscmd_attention_lock);
+		}
+		spin_unlock(&kafscmd_attention_lock);
+
+		afs_kafstimod_del_timer(&afs_mntpt_expiry_timer);
+	}
+
+	up_write(&afscm_sem);
+
+} /* end afscm_stop() */
+
+/*****************************************************************************/
+/*
+ * handle the fileserver breaking a set of callbacks
+ */
+static void _SRXAFSCM_CallBack(struct rxrpc_call *call)
+{
+	struct afs_server *server;
+	size_t count, qty, tmp;
+	int ret = 0, removed;
+
+	_enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
+
+	server = afs_server_get_from_peer(call->conn->peer);
+
+	switch (call->app_call_state) {
+		/* we've received the last packet
+		 * - drain all the data from the call and send the reply
+		 */
+	case RXRPC_CSTATE_SRVR_GOT_ARGS:
+		ret = -EBADMSG;
+		qty = call->app_ready_qty;
+		if (qty < 8 || qty > 50 * (6 * 4) + 8)
+			break;
+
+		{
+			struct afs_callback *cb, *pcb;
+			int loop;
+			__be32 *fp, *bp;
+
+			fp = rxrpc_call_alloc_scratch(call, qty);
+
+			/* drag the entire argument block out to the scratch
+			 * space */
+			ret = rxrpc_call_read_data(call, fp, qty, 0);
+			if (ret < 0)
+				break;
+
+			/* and unmarshall the parameter block */
+			ret = -EBADMSG;
+			count = ntohl(*fp++);
+			if (count>AFSCBMAX ||
+			    (count * (3 * 4) + 8 != qty &&
+			     count * (6 * 4) + 8 != qty))
+				break;
+
+			bp = fp + count*3;
+			tmp = ntohl(*bp++);
+			if (tmp > 0 && tmp != count)
+				break;
+			if (tmp == 0)
+				bp = NULL;
+
+			pcb = cb = rxrpc_call_alloc_scratch_s(
+				call, struct afs_callback);
+
+			for (loop = count - 1; loop >= 0; loop--) {
+				pcb->fid.vid	= ntohl(*fp++);
+				pcb->fid.vnode	= ntohl(*fp++);
+				pcb->fid.unique	= ntohl(*fp++);
+				if (bp) {
+					pcb->version	= ntohl(*bp++);
+					pcb->expiry	= ntohl(*bp++);
+					pcb->type	= ntohl(*bp++);
+				}
+				else {
+					pcb->version	= 0;
+					pcb->expiry	= 0;
+					pcb->type	= AFSCM_CB_UNTYPED;
+				}
+				pcb++;
+			}
+
+			/* invoke the actual service routine */
+			ret = SRXAFSCM_CallBack(server, count, cb);
+			if (ret < 0)
+				break;
+		}
+
+		/* send the reply */
+		ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
+					    GFP_KERNEL, 0, &count);
+		if (ret < 0)
+			break;
+		break;
+
+		/* operation complete */
+	case RXRPC_CSTATE_COMPLETE:
+		call->app_user = NULL;
+		removed = 0;
+		spin_lock(&afscm_calls_lock);
+		if (!list_empty(&call->app_link)) {
+			list_del_init(&call->app_link);
+			removed = 1;
+		}
+		spin_unlock(&afscm_calls_lock);
+
+		if (removed)
+			rxrpc_put_call(call);
+		break;
+
+		/* operation terminated on error */
+	case RXRPC_CSTATE_ERROR:
+		call->app_user = NULL;
+		break;
+
+	default:
+		break;
+	}
+
+	if (ret < 0)
+		rxrpc_call_abort(call, ret);
+
+	afs_put_server(server);
+
+	_leave(" = %d", ret);
+
+} /* end _SRXAFSCM_CallBack() */
+
+/*****************************************************************************/
+/*
+ * handle the fileserver asking us to initialise our callback state
+ */
+static void _SRXAFSCM_InitCallBackState(struct rxrpc_call *call)
+{
+	struct afs_server *server;
+	size_t count;
+	int ret = 0, removed;
+
+	_enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
+
+	server = afs_server_get_from_peer(call->conn->peer);
+
+	switch (call->app_call_state) {
+		/* we've received the last packet - drain all the data from the
+		 * call */
+	case RXRPC_CSTATE_SRVR_GOT_ARGS:
+		/* shouldn't be any args */
+		ret = -EBADMSG;
+		break;
+
+		/* send the reply when asked for it */
+	case RXRPC_CSTATE_SRVR_SND_REPLY:
+		/* invoke the actual service routine */
+		ret = SRXAFSCM_InitCallBackState(server);
+		if (ret < 0)
+			break;
+
+		ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
+					    GFP_KERNEL, 0, &count);
+		if (ret < 0)
+			break;
+		break;
+
+		/* operation complete */
+	case RXRPC_CSTATE_COMPLETE:
+		call->app_user = NULL;
+		removed = 0;
+		spin_lock(&afscm_calls_lock);
+		if (!list_empty(&call->app_link)) {
+			list_del_init(&call->app_link);
+			removed = 1;
+		}
+		spin_unlock(&afscm_calls_lock);
+
+		if (removed)
+			rxrpc_put_call(call);
+		break;
+
+		/* operation terminated on error */
+	case RXRPC_CSTATE_ERROR:
+		call->app_user = NULL;
+		break;
+
+	default:
+		break;
+	}
+
+	if (ret < 0)
+		rxrpc_call_abort(call, ret);
+
+	afs_put_server(server);
+
+	_leave(" = %d", ret);
+
+} /* end _SRXAFSCM_InitCallBackState() */
+
+/*****************************************************************************/
+/*
+ * handle a probe from a fileserver
+ */
+static void _SRXAFSCM_Probe(struct rxrpc_call *call)
+{
+	struct afs_server *server;
+	size_t count;
+	int ret = 0, removed;
+
+	_enter("%p{acs=%s}", call, rxrpc_call_states[call->app_call_state]);
+
+	server = afs_server_get_from_peer(call->conn->peer);
+
+	switch (call->app_call_state) {
+		/* we've received the last packet - drain all the data from the
+		 * call */
+	case RXRPC_CSTATE_SRVR_GOT_ARGS:
+		/* shouldn't be any args */
+		ret = -EBADMSG;
+		break;
+
+		/* send the reply when asked for it */
+	case RXRPC_CSTATE_SRVR_SND_REPLY:
+		/* invoke the actual service routine */
+		ret = SRXAFSCM_Probe(server);
+		if (ret < 0)
+			break;
+
+		ret = rxrpc_call_write_data(call, 0, NULL, RXRPC_LAST_PACKET,
+					    GFP_KERNEL, 0, &count);
+		if (ret < 0)
+			break;
+		break;
+
+		/* operation complete */
+	case RXRPC_CSTATE_COMPLETE:
+		call->app_user = NULL;
+		removed = 0;
+		spin_lock(&afscm_calls_lock);
+		if (!list_empty(&call->app_link)) {
+			list_del_init(&call->app_link);
+			removed = 1;
+		}
+		spin_unlock(&afscm_calls_lock);
+
+		if (removed)
+			rxrpc_put_call(call);
+		break;
+
+		/* operation terminated on error */
+	case RXRPC_CSTATE_ERROR:
+		call->app_user = NULL;
+		break;
+
+	default:
+		break;
+	}
+
+	if (ret < 0)
+		rxrpc_call_abort(call, ret);
+
+	afs_put_server(server);
+
+	_leave(" = %d", ret);
+
+} /* end _SRXAFSCM_Probe() */