0,0 → 1,200 |
/* |
* 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 <libadt/list.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 IPC_M_CONNECT_ME_TO: |
/* |
* Connect the client file system to another one. |
*/ |
/* FIXME: |
* Prevent ordinary clients from connecting to file |
* system servers directly. This should be solved by |
* applying some security mechanisms. |
*/ |
fs_handle = IPC_GET_ARG1(call); |
phone = vfs_grab_phone(fs_handle); |
(void) ipc_forward_fast(callid, phone, 0, 0, 0, |
IPC_FF_NONE); |
vfs_release_phone(phone); |
break; |
case VFS_REGISTER: |
vfs_register(callid, &call); |
/* |
* Keep the connection open so that a file system can |
* later ask us to connect it to another file system. |
* This is necessary to support non-root mounts. |
*/ |
break; |
case VFS_MOUNT: |
vfs_mount(callid, &call); |
break; |
case VFS_OPEN: |
vfs_open(callid, &call); |
break; |
case VFS_CLOSE: |
vfs_close(callid, &call); |
break; |
case VFS_READ: |
vfs_read(callid, &call); |
break; |
case VFS_WRITE: |
vfs_write(callid, &call); |
break; |
case VFS_SEEK: |
vfs_seek(callid, &call); |
break; |
case VFS_TRUNCATE: |
vfs_truncate(callid, &call); |
break; |
case VFS_MKDIR: |
vfs_mkdir(callid, &call); |
break; |
case VFS_UNLINK: |
vfs_unlink(callid, &call); |
break; |
case VFS_RENAME: |
vfs_rename(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 the list of registered file systems. |
*/ |
list_initialize(&fs_head); |
|
/* |
* 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. |
*/ |
list_initialize(&plb_head); |
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 connectio 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; |
} |
|
/** |
* @} |
*/ |