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2518 jermar 1 
/*
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 * Copyright (c) 2007 Jakub Jermar
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 * 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
2542 jermar 35 
 * @brief	VFS service for HelenOS.
2518 jermar 36 
 */
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2520 jermar 38 
#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>
2532 jermar 42 
#include <stdio.h>
2523 jermar 43 
#include <bool.h>
2542 jermar 44 
#include <string.h>
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#include <as.h>
2526 jermar 46 
#include <libadt/list.h>
2552 jermar 47 
#include <atomic.h>
2520 jermar 48 
#include "vfs.h"
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2532 jermar 50 
#define dprintf(...)	printf(__VA_ARGS__)
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2520 jermar 52 
static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
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{
2523 jermar 54 
	bool keep_on_going = 1;
2520 jermar 55 
 
2532 jermar 56 
	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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	 */
2619 jermar 62 
	ipc_answer_0(iid, EOK);
2520 jermar 63 
 
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	/*
2523 jermar 65 
	 * 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 
	 */
2523 jermar 74 
	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);
2532 jermar 79 
 
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		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);
2569 jermar 88 
			keep_on_going = false;
2523 jermar 89 
			break;
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		case VFS_MOUNT:
2589 jermar 91 
			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;
2625 jermar 96 
		case VFS_READ:
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			vfs_read(callid, &call);
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			break;
2523 jermar 99 
		case VFS_UNMOUNT:
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		case VFS_CREATE:
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		case VFS_CLOSE:
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		case VFS_WRITE:
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		case VFS_SEEK:
2593 jermar 104 
		case VFS_UNLINK:
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		case VFS_RENAME:
2523 jermar 106 
		default:
2619 jermar 107 
			ipc_answer_0(callid, ENOTSUP);
2523 jermar 108 
			break;
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		}
2520 jermar 110 
	}
2523 jermar 111 
 
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	/* TODO: cleanup after the client */
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2520 jermar 114 
}
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2518 jermar 116 
int main(int argc, char **argv)
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{
2520 jermar 118 
	ipcarg_t phonead;
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2532 jermar 120 
	printf("VFS: HelenOS VFS server\n");
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2542 jermar 122 
	/*
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	 * Initialize the list of registered file systems.
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	 */
2526 jermar 125 
	list_initialize(&fs_head);
2542 jermar 126 
 
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	/*
2596 jermar 128 
	 * Initialize VFS node hash table.
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	 */
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	if (!vfs_nodes_init()) {
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		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 136 
	 * 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 140 
	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");
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		return ENOMEM;
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	}
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	memset(plb, 0, PLB_SIZE);
2542 jermar 150 
 
151 
	/*
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	 * Set a connectio handling function/fibril.
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	 */
2520 jermar 154 
	async_set_client_connection(vfs_connection);
2542 jermar 155 
 
156 
	/*
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	 * Register at the naming service.
158 
	 */
2637 cejka 159 
	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
2542 jermar 160 
 
161 
	/*
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	 * Start accepting connections.
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	 */
2520 jermar 164 
	async_manager();
2518 jermar 165 
	return 0;
166 
}
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168 
/**
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 * @}
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 */