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/*
* Copyright (c) 2008 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup fs
* @{
*/
/**
* @file vfs.c
* @brief VFS service for HelenOS.
*/
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <async.h>
#include <errno.h>
#include <stdio.h>
#include <bool.h>
#include <string.h>
#include <as.h>
#include <atomic.h>
#include "vfs.h"
#define NAME "vfs"
static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
{
bool keep_on_going = true;
/*
* The connection was opened via the IPC_CONNECT_ME_TO call.
* This call needs to be answered.
*/
ipc_answer_0(iid, EOK);
/*
* Here we enter the main connection fibril loop.
* The logic behind this loop and the protocol is that we'd like to keep
* each connection open until the client hangs up. When the client hangs
* up, we will free its VFS state. The act of hanging up the connection
* by the client is equivalent to client termination because we cannot
* distinguish one from the other. On the other hand, the client can
* hang up arbitrarily if it has no open files and reestablish the
* connection later.
*/
while (keep_on_going) {
ipc_call_t call;
ipc_callid_t callid = async_get_call(&call);
fs_handle_t fs_handle;
int phone;
switch (IPC_GET_METHOD(call)) {
case IPC_M_PHONE_HUNGUP:
keep_on_going = false;
break;
case VFS_IN_REGISTER:
vfs_register(callid, &call);
keep_on_going = false;
break;
case VFS_IN_MOUNT:
vfs_mount(callid, &call);
break;
case VFS_IN_OPEN:
vfs_open(callid, &call);
break;
case VFS_IN_OPEN_NODE:
vfs_open_node(callid, &call);
break;
case VFS_IN_CLOSE:
vfs_close(callid, &call);
break;
case VFS_IN_READ:
vfs_read(callid, &call);
break;
case VFS_IN_WRITE:
vfs_write(callid, &call);
break;
case VFS_IN_SEEK:
vfs_seek(callid, &call);
break;
case VFS_IN_TRUNCATE:
vfs_truncate(callid, &call);
break;
case VFS_IN_FSTAT:
vfs_fstat(callid, &call);
break;
case VFS_IN_STAT:
vfs_stat(callid, &call);
break;
case VFS_IN_MKDIR:
vfs_mkdir(callid, &call);
break;
case VFS_IN_UNLINK:
vfs_unlink(callid, &call);
break;
case VFS_IN_RENAME:
vfs_rename(callid, &call);
break;
case VFS_IN_SYNC:
vfs_sync(callid, &call);
break;
default:
ipc_answer_0(callid, ENOTSUP);
break;
}
}
/* TODO: cleanup after the client */
}
int main(int argc, char **argv)
{
printf(NAME ": HelenOS VFS server\n");
/*
* Initialize VFS node hash table.
*/
if (!vfs_nodes_init()) {
printf(NAME ": Failed to initialize VFS node hash table\n");
return ENOMEM;
}
/*
* Allocate and initialize the Path Lookup Buffer.
*/
plb = as_get_mappable_page(PLB_SIZE);
if (!plb) {
printf(NAME ": Cannot allocate a mappable piece of address space\n");
return ENOMEM;
}
if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
AS_AREA_CACHEABLE) != plb) {
printf(NAME ": Cannot create address space area\n");
return ENOMEM;
}
memset(plb, 0, PLB_SIZE);
/*
* Set a connection handling function/fibril.
*/
async_set_client_connection(vfs_connection);
/*
* Register at the naming service.
*/
ipcarg_t phonead;
ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, 0, &phonead);
/*
* Start accepting connections.
*/
printf(NAME ": Accepting connections\n");
async_manager();
return 0;
}
/**
* @}
*/