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2518 jermar 1
/*
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 * Copyright (c) 2008 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
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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 <atomic.h>
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#include "vfs.h"
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#define NAME "vfs"
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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 = true;
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2520 jermar 55
	/*
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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);
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2520 jermar 61
	/*
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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
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	 * 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.
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	 */
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	while (keep_on_going) {
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		ipc_call_t call;
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		ipc_callid_t callid = async_get_call(&call);
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		fs_handle_t fs_handle;
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		int phone;
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2523 jermar 78
		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_IN_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_IN_MOUNT:
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			vfs_mount(callid, &call);
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			break;
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		case VFS_IN_OPEN:
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			vfs_open(callid, &call);
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			break;
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		case VFS_IN_OPEN_NODE:
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			vfs_open_node(callid, &call);
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			break;
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		case VFS_IN_CLOSE:
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			vfs_close(callid, &call);
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			break;
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		case VFS_IN_READ:
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			vfs_read(callid, &call);
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			break;
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		case VFS_IN_WRITE:
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			vfs_write(callid, &call);
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			break;
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		case VFS_IN_SEEK:
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			vfs_seek(callid, &call);
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			break;
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		case VFS_IN_TRUNCATE:
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			vfs_truncate(callid, &call);
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			break;
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		case VFS_IN_MKDIR:
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			vfs_mkdir(callid, &call);
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			break;
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		case VFS_IN_UNLINK:
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			vfs_unlink(callid, &call);
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			break;
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		case VFS_IN_RENAME:
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			vfs_rename(callid, &call);
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			break;
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		case VFS_IN_DEVICE:
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			vfs_device(callid, &call);
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			break;
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		case VFS_IN_SYNC:
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			vfs_sync(callid, &call);
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			break;
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		case VFS_IN_NODE:
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			vfs_node(callid, &call);
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			break;
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		default:
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			ipc_answer_0(callid, ENOTSUP);
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			break;
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		}
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	}
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2523 jermar 134
	/* TODO: cleanup after the client */
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}
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int main(int argc, char **argv)
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{
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	printf(NAME ": HelenOS VFS server\n");
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2542 jermar 141
	/*
2596 jermar 142
	 * Initialize VFS node hash table.
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	 */
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	if (!vfs_nodes_init()) {
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		printf(NAME ": Failed to initialize VFS node hash table\n");
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		return ENOMEM;
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	}
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2596 jermar 149
	/*
2542 jermar 150
	 * Allocate and initialize the Path Lookup Buffer.
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	 */
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	plb = as_get_mappable_page(PLB_SIZE);
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	if (!plb) {
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		printf(NAME ": Cannot allocate a mappable piece of address space\n");
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		return ENOMEM;
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	}
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2543 jermar 158
	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(NAME ": Cannot create address space area\n");
2543 jermar 161
		return ENOMEM;
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	}
163
	memset(plb, 0, PLB_SIZE);
2542 jermar 164
 
165
	/*
4539 jermar 166
	 * Set a connection handling function/fibril.
2542 jermar 167
	 */
2520 jermar 168
	async_set_client_connection(vfs_connection);
4539 jermar 169
 
170
	/*
2542 jermar 171
	 * Register at the naming service.
172
	 */
4010 decky 173
	ipcarg_t phonead;
2637 cejka 174
	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
4010 decky 175
 
2542 jermar 176
	/*
177
	 * Start accepting connections.
178
	 */
3079 decky 179
	printf(NAME ": Accepting connections\n");
2520 jermar 180
	async_manager();
2518 jermar 181
	return 0;
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}
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/**
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 * @}
4010 decky 186
 */