source: mainline/uspace/srv/vfs/vfs.c@ c1f7a315

/*
 * 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 <vfs/vfs.h>
#include <stdlib.h>
#include <ipc/services.h>
#include <abi/ipc/methods.h>
#include <libarch/config.h>
#include <ns.h>
#include <async.h>
#include <errno.h>
#include <stdio.h>
#include <stdbool.h>
#include <str.h>
#include <as.h>
#include <atomic.h>
#include <macros.h>
#include "vfs.h"

#define NAME  "vfs"

static void vfs_pager(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        async_answer_0(iid, EOK);

        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                if (!IPC_GET_IMETHOD(call))
                        break;
                
                switch (IPC_GET_IMETHOD(call)) {
                case IPC_M_PAGE_IN:
                        vfs_page_in(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOTSUP);
                        break;
                }
        }
}

static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        bool cont = true;
        
        /*
         * The connection was opened via the IPC_CONNECT_ME_TO call.
         * This call needs to be answered.
         */
        async_answer_0(iid, EOK);
        
        while (cont) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                if (!IPC_GET_IMETHOD(call))
                        break;
                
                switch (IPC_GET_IMETHOD(call)) {
                case VFS_IN_REGISTER:
                        vfs_register(callid, &call);
                        cont = false;
                        break;
                case VFS_IN_MOUNT:
                        vfs_mount_srv(callid, &call);
                        break;
                case VFS_IN_UNMOUNT:
                        vfs_unmount_srv(callid, &call);
                        break;
                case VFS_IN_OPEN:
                        vfs_open(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;
                case VFS_IN_DUP:
                        vfs_dup(callid, &call);
                        break;
                case VFS_IN_WAIT_HANDLE:
                        vfs_wait_handle(callid, &call);
                        break;
                case VFS_IN_MTAB_GET:
                        vfs_get_mtab(callid, &call);
                        break;
                case VFS_IN_STATFS:
                        vfs_statfs(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOTSUP);
                        break;
                }
        }
        
        /*
         * Open files for this client will be cleaned up when its last
         * connection fibril terminates.
         */
}

static void notification_handler(ipc_callid_t callid, ipc_call_t *call, void *arg)
{
        if (IPC_GET_ARG1(*call) == VFS_PASS_HANDLE)
                vfs_pass_handle(
                    (task_id_t) MERGE_LOUP32(IPC_GET_ARG4(*call),
                    IPC_GET_ARG5(*call)), call->in_task_id,
                    (int) IPC_GET_ARG2(*call));
}

int main(int argc, char **argv)
{
        int rc;

        printf("%s: HelenOS VFS server\n", NAME);
        
        /*
         * Initialize VFS node hash table.
         */
        if (!vfs_nodes_init()) {
                printf("%s: Failed to initialize VFS node hash table\n",
                    NAME);
                return ENOMEM;
        }
        
        /*
         * Allocate and initialize the Path Lookup Buffer.
         */
        plb = as_area_create(AS_AREA_ANY, PLB_SIZE,
            AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE, AS_AREA_UNPAGED);
        if (plb == AS_MAP_FAILED) {
                printf("%s: Cannot create address space area\n", NAME);
                return ENOMEM;
        }
        memset(plb, 0, PLB_SIZE);
        
        /*
         * Set client data constructor and destructor.
         */
        async_set_client_data_constructor(vfs_client_data_create);
        async_set_client_data_destructor(vfs_client_data_destroy);

        /*
         * Create a port for the pager.
         */
        port_id_t port;
        rc = async_create_port(INTERFACE_PAGER, vfs_pager, NULL, &port);
        if (rc != EOK)
                return rc;
                
        /*
         * Set a connection handling function/fibril.
         */
        async_set_fallback_port_handler(vfs_connection, NULL);

        /*
         * Subscribe to notifications.
         */
        async_event_task_subscribe(EVENT_TASK_STATE_CHANGE, notification_handler,
            NULL);
        
        /*
         * Register at the naming service.
         */
        rc = service_register(SERVICE_VFS);
        if (rc != EOK) {
                printf("%s: Cannot register VFS service\n", NAME);
                return rc;
        }
        
        /*
         * Start accepting connections.
         */
        printf("%s: Accepting connections\n", NAME);
        async_manager();
        return 0;
}

/**
 * @}
 */