0,0 → 1,171 |
/* |
* Copyright (c) 2006 Martin Decky |
* 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 fat.c |
* @brief FAT file system driver for HelenOS. |
*/ |
|
#include "fat.h" |
#include <ipc/ipc.h> |
#include <ipc/services.h> |
#include <async.h> |
#include <errno.h> |
#include <unistd.h> |
#include <stdio.h> |
#include <libfs.h> |
#include "../../vfs/vfs.h" |
|
|
vfs_info_t fat_vfs_info = { |
.name = "fat", |
}; |
|
fs_reg_t fat_reg; |
|
/** |
* This connection fibril processes VFS requests from VFS. |
* |
* In order to support simultaneous VFS requests, our design is as follows. |
* The connection fibril accepts VFS requests from VFS. If there is only one |
* instance of the fibril, VFS will need to serialize all VFS requests it sends |
* to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO |
* call. In that case, a new connection fibril will be created, which in turn |
* will accept the call. Thus, a new phone will be opened for VFS. |
* |
* There are few issues with this arrangement. First, VFS can run out of |
* available phones. In that case, VFS can close some other phones or use one |
* phone for more serialized requests. Similarily, FAT can refuse to duplicate |
* the connection. VFS should then just make use of already existing phones and |
* route its requests through them. To avoid paying the fibril creation price |
* upon each request, FAT might want to keep the connections open after the |
* request has been completed. |
*/ |
static void fat_connection(ipc_callid_t iid, ipc_call_t *icall) |
{ |
if (iid) { |
/* |
* This only happens for connections opened by |
* IPC_M_CONNECT_ME_TO calls as opposed to callback connections |
* created by IPC_M_CONNECT_TO_ME. |
*/ |
ipc_answer_0(iid, EOK); |
} |
|
dprintf("VFS-FAT connection established.\n"); |
while (1) { |
ipc_callid_t callid; |
ipc_call_t call; |
|
callid = async_get_call(&call); |
switch (IPC_GET_METHOD(call)) { |
case IPC_M_PHONE_HUNGUP: |
return; |
case VFS_OUT_MOUNTED: |
fat_mounted(callid, &call); |
break; |
case VFS_OUT_MOUNT: |
fat_mount(callid, &call); |
break; |
case VFS_OUT_LOOKUP: |
fat_lookup(callid, &call); |
break; |
case VFS_OUT_READ: |
fat_read(callid, &call); |
break; |
case VFS_OUT_WRITE: |
fat_write(callid, &call); |
break; |
case VFS_OUT_TRUNCATE: |
fat_truncate(callid, &call); |
break; |
case VFS_OUT_STAT: |
fat_stat(callid, &call); |
break; |
case VFS_OUT_CLOSE: |
fat_close(callid, &call); |
break; |
case VFS_OUT_DESTROY: |
fat_destroy(callid, &call); |
break; |
case VFS_OUT_OPEN_NODE: |
fat_open_node(callid, &call); |
break; |
case VFS_OUT_SYNC: |
fat_sync(callid, &call); |
break; |
default: |
ipc_answer_0(callid, ENOTSUP); |
break; |
} |
} |
} |
|
int main(int argc, char **argv) |
{ |
int vfs_phone; |
int rc; |
|
printf("fat: HelenOS FAT file system server.\n"); |
|
rc = fat_idx_init(); |
if (rc != EOK) |
goto err; |
|
vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0); |
if (vfs_phone < EOK) { |
printf("fat: failed to connect to VFS\n"); |
return -1; |
} |
|
rc = fs_register(vfs_phone, &fat_reg, &fat_vfs_info, fat_connection); |
if (rc != EOK) { |
fat_idx_fini(); |
goto err; |
} |
|
dprintf("FAT filesystem registered, fs_handle=%d.\n", |
fat_reg.fs_handle); |
|
async_manager(); |
/* not reached */ |
return 0; |
|
err: |
printf("Failed to register the FAT file system (%d)\n", rc); |
return rc; |
} |
|
/** |
* @} |
*/ |