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* Copyright (c) 2006 Martin Decky
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* Copyright (c) 2008 Jakub Jermar
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* Copyright (c) 2011 Martin Sucha
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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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* - 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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* 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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* @brief EXT2 file system driver for HelenOS.
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#include <ipc/services.h>
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#include "../../vfs/vfs.h"
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vfs_info_t ext2fs_vfs_info = {
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* This connection fibril processes VFS requests from VFS.
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* In order to support simultaneous VFS requests, our design is as follows.
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* The connection fibril accepts VFS requests from VFS. If there is only one
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* instance of the fibril, VFS will need to serialize all VFS requests it sends
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* to EXT2FS. To overcome this bottleneck, VFS can send EXT2FS the IPC_M_CONNECT_ME_TO
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* call. In that case, a new connection fibril will be created, which in turn
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* will accept the call. Thus, a new phone will be opened for VFS.
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* There are few issues with this arrangement. First, VFS can run out of
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* available phones. In that case, VFS can close some other phones or use one
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* phone for more serialized requests. Similarily, EXT2FS can refuse to duplicate
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* the connection. VFS should then just make use of already existing phones and
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* route its requests through them. To avoid paying the fibril creation price
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* upon each request, EXT2FS might want to keep the connections open after the
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* request has been completed.
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static void ext2fs_connection(ipc_callid_t iid, ipc_call_t *icall)
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* This only happens for connections opened by
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* IPC_M_CONNECT_ME_TO calls as opposed to callback connections
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* created by IPC_M_CONNECT_TO_ME.
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async_answer_0(iid, EOK);
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dprintf(NAME ": connection opened\n");
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callid = async_get_call(&call);
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switch (IPC_GET_IMETHOD(call)) {
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case IPC_M_PHONE_HUNGUP:
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ext2fs_mounted(callid, &call);
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ext2fs_mount(callid, &call);
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case VFS_OUT_UNMOUNTED:
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ext2fs_unmounted(callid, &call);
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case VFS_OUT_UNMOUNT:
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ext2fs_unmount(callid, &call);
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ext2fs_lookup(callid, &call);
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ext2fs_read(callid, &call);
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ext2fs_write(callid, &call);
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case VFS_OUT_TRUNCATE:
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ext2fs_truncate(callid, &call);
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ext2fs_stat(callid, &call);
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ext2fs_close(callid, &call);
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case VFS_OUT_DESTROY:
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ext2fs_destroy(callid, &call);
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case VFS_OUT_OPEN_NODE:
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ext2fs_open_node(callid, &call);
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ext2fs_sync(callid, &call);
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async_answer_0(callid, ENOTSUP);
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int main(int argc, char **argv)
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printf(NAME ": HelenOS EXT2 file system server\n");
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vfs_phone = service_connect_blocking(SERVICE_VFS, 0, 0);
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if (vfs_phone < EOK) {
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printf(NAME ": failed to connect to VFS\n");
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rc = ext2fs_global_init();
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printf(NAME ": Failed global initialization\n");
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rc = fs_register(vfs_phone, &ext2fs_reg, &ext2fs_vfs_info, ext2fs_connection);
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fprintf(stdout, NAME ": Failed to register fs (%d)\n", rc);
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printf(NAME ": Accepting connections\n");
added
removed
uspace/srv/fs/ext2fs/ext2fs.c
