| 1 | /*
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| 2 | * Copyright (c) 2007 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup fs
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file vfs.c
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| 35 | * @brief VFS service for HelenOS.
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| 36 | */
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| 37 |
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| 38 | #include <ipc/ipc.h>
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| 39 | #include <ipc/services.h>
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| 40 | #include <async.h>
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| 41 | #include <errno.h>
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| 42 | #include <stdio.h>
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| 43 | #include <bool.h>
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| 44 | #include <string.h>
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| 45 | #include <as.h>
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| 46 | #include <libadt/list.h>
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| 47 | #include <atomic.h>
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| 48 | #include "vfs.h"
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| 49 |
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| 50 | #define dprintf(...) printf(__VA_ARGS__)
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| 51 |
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| 52 | static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall)
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| 53 | {
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| 54 | bool keep_on_going = 1;
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| 55 |
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| 56 | printf("Connection opened from %p\n", icall->in_phone_hash);
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| 57 |
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| 58 | /*
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| 59 | * The connection was opened via the IPC_CONNECT_ME_TO call.
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| 60 | * This call needs to be answered.
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| 61 | */
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| 62 | ipc_answer_fast_0(iid, EOK);
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| 63 |
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| 64 | /*
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| 65 | * Here we enter the main connection fibril loop.
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| 66 | * The logic behind this loop and the protocol is that we'd like to keep
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| 67 | * each connection open until the client hangs up. When the client hangs
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| 68 | * up, we will free its VFS state. The act of hanging up the connection
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| 69 | * by the client is equivalent to client termination because we cannot
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| 70 | * distinguish one from the other. On the other hand, the client can
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| 71 | * hang up arbitrarily if it has no open files and reestablish the
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| 72 | * connection later.
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| 73 | */
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| 74 | while (keep_on_going) {
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| 75 | ipc_callid_t callid;
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| 76 | ipc_call_t call;
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| 77 |
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| 78 | callid = async_get_call(&call);
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| 79 |
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| 80 | printf("Received call, method=%d\n", IPC_GET_METHOD(call));
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| 81 |
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| 82 | switch (IPC_GET_METHOD(call)) {
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| 83 | case IPC_M_PHONE_HUNGUP:
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| 84 | keep_on_going = false;
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| 85 | break;
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| 86 | case VFS_REGISTER:
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| 87 | vfs_register(callid, &call);
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| 88 | keep_on_going = false;
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| 89 | break;
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| 90 | case VFS_MOUNT:
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| 91 | vfs_mount(callid, &call);
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| 92 | keep_on_going = false;
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| 93 | break;
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| 94 | case VFS_OPEN:
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| 95 | vfs_open(callid, &call);
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| 96 | break;
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| 97 | case VFS_UNMOUNT:
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| 98 | case VFS_CREATE:
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| 99 | case VFS_CLOSE:
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| 100 | case VFS_READ:
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| 101 | case VFS_WRITE:
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| 102 | case VFS_SEEK:
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| 103 | default:
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| 104 | ipc_answer_fast_0(callid, ENOTSUP);
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| 105 | break;
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| 106 | }
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| 107 | }
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| 108 |
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| 109 | /* TODO: cleanup after the client */
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| 110 |
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| 111 | }
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| 112 |
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| 113 | int main(int argc, char **argv)
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| 114 | {
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| 115 | ipcarg_t phonead;
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| 116 |
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| 117 | printf("VFS: HelenOS VFS server\n");
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| 118 |
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| 119 | /*
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| 120 | * Initialize the list of registered file systems.
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| 121 | */
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| 122 | list_initialize(&fs_head);
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| 123 |
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| 124 | /*
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| 125 | * Allocate and initialize the Path Lookup Buffer.
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| 126 | */
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| 127 | list_initialize(&plb_head);
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| 128 | plb = as_get_mappable_page(PLB_SIZE);
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| 129 | if (!plb) {
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| 130 | printf("Cannot allocate a mappable piece of address space\n");
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| 131 | return ENOMEM;
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| 132 | }
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| 133 | if (as_area_create(plb, PLB_SIZE, AS_AREA_READ | AS_AREA_WRITE |
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| 134 | AS_AREA_CACHEABLE) != plb) {
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| 135 | printf("Cannot create address space area.\n");
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| 136 | return ENOMEM;
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| 137 | }
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| 138 | memset(plb, 0, PLB_SIZE);
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| 139 |
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| 140 | /*
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| 141 | * Set a connectio handling function/fibril.
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| 142 | */
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| 143 | async_set_client_connection(vfs_connection);
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| 144 |
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| 145 | /*
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| 146 | * Register at the naming service.
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| 147 | */
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| 148 | ipc_connect_to_me(PHONE_NS, SERVICE_VFS, 0, &phonead);
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| 149 |
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| 150 | /*
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| 151 | * Start accepting connections.
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| 152 | */
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| 153 | async_manager();
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| 154 | return 0;
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| 155 | }
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| 156 |
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| 157 | /**
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| 158 | * @}
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| 159 | */
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