WebSVN – HelenOS – Blame – /trunk/uspace/srv/vfs/vfs.c

Rev	Author	Line No.	Line
2518	jermar	1	/*
		2	* Copyright (c) 2007 Jakub Jermar
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	/** @addtogroup fs
		30	* @{
		31	*/
		32
		33	/**
		34	* @file vfs.c
2542	jermar	35	* @brief VFS service for HelenOS.
2518	jermar	36	*/
		37
2520	jermar	38	#include <ipc/ipc.h>
		39	#include <ipc/services.h>
		40	#include <async.h>
		41	#include <errno.h>
2532	jermar	42	#include <stdio.h>
2523	jermar	43	#include <bool.h>
2542	jermar	44	#include <string.h>
		45	#include <as.h>
2526	jermar	46	#include <libadt/list.h>
2552	jermar	47	#include <atomic.h>
2520	jermar	48	#include "vfs.h"
		49
2532	jermar	50	#define dprintf(...) printf(__VA_ARGS__)
		51
2520	jermar	52	static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
		53	{
2523	jermar	54	bool keep_on_going = 1;
2520	jermar	55
2532	jermar	56	printf("Connection opened from %p\n", icall->in_phone_hash);
		57
2520	jermar	58	/*
2560	jermar	59	* Initialize the table of open files.
		60	*/
		61	if (!vfs_conn_open_files_init()) {
2588	jermar	62	ipc_answer_fast_0(iid, ENOMEM);
2560	jermar	63	return;
		64	}
		65
		66	/*
2520	jermar	67	* The connection was opened via the IPC_CONNECT_ME_TO call.
		68	* This call needs to be answered.
		69	*/
2588	jermar	70	ipc_answer_fast_0(iid, EOK);
2520	jermar	71
		72	/*
2523	jermar	73	* Here we enter the main connection fibril loop.
		74	* The logic behind this loop and the protocol is that we'd like to keep
2560	jermar	75	* each connection open until the client hangs up. When the client hangs
		76	* up, we will free its VFS state. The act of hanging up the connection
		77	* by the client is equivalent to client termination because we cannot
		78	* distinguish one from the other. On the other hand, the client can
		79	* hang up arbitrarily if it has no open files and reestablish the
		80	* connection later.
2520	jermar	81	*/
2523	jermar	82	while (keep_on_going) {
		83	ipc_callid_t callid;
		84	ipc_call_t call;
		85
		86	callid = async_get_call(&call);
2532	jermar	87
		88	printf("Received call, method=%d\n", IPC_GET_METHOD(call));
2523	jermar	89
		90	switch (IPC_GET_METHOD(call)) {
		91	case IPC_M_PHONE_HUNGUP:
		92	keep_on_going = false;
		93	break;
		94	case VFS_REGISTER:
		95	vfs_register(callid, &call);
2569	jermar	96	keep_on_going = false;
2523	jermar	97	break;
		98	case VFS_MOUNT:
		99	case VFS_UNMOUNT:
		100	case VFS_OPEN:
		101	case VFS_CREATE:
		102	case VFS_CLOSE:
		103	case VFS_READ:
		104	case VFS_WRITE:
		105	case VFS_SEEK:
		106	default:
2588	jermar	107	ipc_answer_fast_0(callid, ENOTSUP);
2523	jermar	108	break;
		109	}
2520	jermar	110	}
2523	jermar	111
		112	/* TODO: cleanup after the client */
		113
2520	jermar	114	}
		115
2518	jermar	116	int main(int argc, char **argv)
		117	{
2520	jermar	118	ipcarg_t phonead;
		119
2532	jermar	120	printf("VFS: HelenOS VFS server\n");
		121
2542	jermar	122	/*
		123	* Initialize the list of registered file systems.
		124	*/
2526	jermar	125	list_initialize(&fs_head);
2542	jermar	126
		127	/*
		128	* Allocate and initialize the Path Lookup Buffer.
		129	*/
		130	list_initialize(&plb_head);
		131	plb = as_get_mappable_page(PLB_SIZE);
2543	jermar	132	if (!plb) {
		133	printf("Cannot allocate a mappable piece of address space\n");
		134	return ENOMEM;
		135	}
		136	if (as_area_create(plb, PLB_SIZE, AS_AREA_READ \| AS_AREA_WRITE \|
		137	AS_AREA_CACHEABLE) != plb) {
		138	printf("Cannot create address space area.\n");
		139	return ENOMEM;
		140	}
		141	memset(plb, 0, PLB_SIZE);
2542	jermar	142
		143	/*
		144	* Set a connectio handling function/fibril.
		145	*/
2520	jermar	146	async_set_client_connection(vfs_connection);
2542	jermar	147
		148	/*
		149	* Register at the naming service.
		150	*/
2520	jermar	151	ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead);
2542	jermar	152
		153	/*
		154	* Start accepting connections.
		155	*/
2520	jermar	156	async_manager();
2518	jermar	157	return 0;
		158	}
		159
		160	/**
		161	* @}
		162	*/

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/vfs/vfs.c – Rev 2588