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2518 jermar 1
/*
2693 jermar 2
 * Copyright (c) 2008 Jakub Jermar
2518 jermar 3
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup fs
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 * @{
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 */ 
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/**
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 * @file	vfs.c
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 * @brief	VFS service for HelenOS.
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 */
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#include <ipc/ipc.h>
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#include <ipc/services.h>
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#include <async.h>
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#include <errno.h>
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#include <stdio.h>
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#include <bool.h>
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#include <string.h>
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#include <as.h>
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#include <libadt/list.h>
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#include <atomic.h>
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#include "vfs.h"
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#define dprintf(...)	printf(__VA_ARGS__)
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static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
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{
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	bool keep_on_going = 1;
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	printf("Connection opened from %p\n", icall->in_phone_hash);
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2520 jermar 58
	/*
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	 * The connection was opened via the IPC_CONNECT_ME_TO call.
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	 * This call needs to be answered.
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	 */
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	ipc_answer_0(iid, EOK);
2520 jermar 63
 
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	/*
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	 * Here we enter the main connection fibril loop.
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	 * The logic behind this loop and the protocol is that we'd like to keep
2560 jermar 67
	 * each connection open until the client hangs up. When the client hangs
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	 * up, we will free its VFS state. The act of hanging up the connection
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	 * by the client is equivalent to client termination because we cannot
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	 * distinguish one from the other. On the other hand, the client can
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	 * hang up arbitrarily if it has no open files and reestablish the
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	 * connection later.
2520 jermar 73
	 */
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	while (keep_on_going) {
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		ipc_callid_t callid;
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		ipc_call_t call;
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		callid = async_get_call(&call);
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80
		printf("Received call, method=%d\n", IPC_GET_METHOD(call));
2523 jermar 81
 
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		switch (IPC_GET_METHOD(call)) {
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		case IPC_M_PHONE_HUNGUP:
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			keep_on_going = false;
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			break;
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		case VFS_REGISTER:
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			vfs_register(callid, &call);
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			keep_on_going = false;
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			break;
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		case VFS_MOUNT:
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			vfs_mount(callid, &call);
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			break;
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		case VFS_OPEN:
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			vfs_open(callid, &call);
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			break;
2734 jermar 96
		case VFS_CLOSE:
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			vfs_close(callid, &call);
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			break;
2625 jermar 99
		case VFS_READ:
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			vfs_read(callid, &call);
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			break;
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		case VFS_WRITE:
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			vfs_write(callid, &call);
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			break;
2684 jermar 105
		case VFS_SEEK:
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			vfs_seek(callid, &call);
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			break;
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		case VFS_TRUNCATE:
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			vfs_truncate(callid, &call);
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			break;
2707 jermar 111
		case VFS_MKDIR:
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			vfs_mkdir(callid, &call);
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			break;
2735 jermar 114
		case VFS_UNLINK:
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			vfs_unlink(callid, &call);
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			break;
2523 jermar 117
		default:
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			ipc_answer_0(callid, ENOTSUP);
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			break;
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		}
2520 jermar 121
	}
2523 jermar 122
 
123
	/* TODO: cleanup after the client */
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2520 jermar 125
}
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2518 jermar 127
int main(int argc, char **argv)
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{
2520 jermar 129
	ipcarg_t phonead;
130
 
2532 jermar 131
	printf("VFS: HelenOS VFS server\n");
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2542 jermar 133
	/*
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	 * Initialize the list of registered file systems.
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	 */
2526 jermar 136
	list_initialize(&fs_head);
2542 jermar 137
 
138
	/*
2596 jermar 139
	 * Initialize VFS node hash table.
140
	 */
141
	if (!vfs_nodes_init()) {
142
		printf("Failed to initialize the VFS node hash table.\n");
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		return ENOMEM;
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	}
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	/*
2542 jermar 147
	 * Allocate and initialize the Path Lookup Buffer.
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	 */
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	list_initialize(&plb_head);
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	plb = as_get_mappable_page(PLB_SIZE);
2543 jermar 151
	if (!plb) {
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		printf("Cannot allocate a mappable piece of address space\n");
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		return ENOMEM;
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	}
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	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
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	    AS_AREA_CACHEABLE) != plb) {
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		printf("Cannot create address space area.\n");
158
		return ENOMEM;
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	}
160
	memset(plb, 0, PLB_SIZE);
2542 jermar 161
 
162
	/*
163
	 * Set a connectio handling function/fibril.
164
	 */
2520 jermar 165
	async_set_client_connection(vfs_connection);
2542 jermar 166
 
167
	/*
168
	 * Register at the naming service.
169
	 */
2637 cejka 170
	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
2542 jermar 171
 
172
	/*
173
	 * Start accepting connections.
174
	 */
2520 jermar 175
	async_manager();
2518 jermar 176
	return 0;
177
}
178
 
179
/**
180
 * @}
181
 */