| 1 | /*
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| 2 | * Copyright (c) 2006 Martin Decky
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| 3 | * Copyright (c) 2008 Jakub Jermar
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| 4 | * Copyright (c) 2011 Oleg Romanenko
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | *
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| 11 | * - Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * - Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * - The name of the author may not be used to endorse or promote products
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| 17 | * derived from this software without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | /** @addtogroup fs
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| 32 | * @{
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| 33 | */
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| 34 |
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| 35 | /**
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| 36 | * @file exfat.c
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| 37 | * @brief FAT file system driver for HelenOS.
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| 38 | */
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| 39 |
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| 40 | #include "exfat.h"
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| 41 | #include <ipc/services.h>
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| 42 | #include <ipc/ns.h>
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| 43 | #include <async.h>
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| 44 | #include <errno.h>
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| 45 | #include <unistd.h>
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| 46 | #include <task.h>
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| 47 | #include <stdio.h>
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| 48 | #include <libfs.h>
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| 49 | #include "../../vfs/vfs.h"
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| 50 |
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| 51 | #define NAME "exfat"
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| 52 |
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| 53 | vfs_info_t exfat_vfs_info = {
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| 54 | .name = NAME,
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| 55 | .concurrent_read_write = false,
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| 56 | .write_retains_size = false,
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| 57 | };
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| 58 |
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| 59 | fs_reg_t exfat_reg;
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| 60 |
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| 61 | /**
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| 62 | * This connection fibril processes VFS requests from VFS.
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| 63 | *
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| 64 | * In order to support simultaneous VFS requests, our design is as follows.
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| 65 | * The connection fibril accepts VFS requests from VFS. If there is only one
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| 66 | * instance of the fibril, VFS will need to serialize all VFS requests it sends
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| 67 | * to FAT. To overcome this bottleneck, VFS can send exFAT the IPC_M_CONNECT_ME_TO
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| 68 | * call. In that case, a new connection fibril will be created, which in turn
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| 69 | * will accept the call. Thus, a new phone will be opened for VFS.
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| 70 | *
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| 71 | * There are few issues with this arrangement. First, VFS can run out of
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| 72 | * available phones. In that case, VFS can close some other phones or use one
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| 73 | * phone for more serialized requests. Similarily, exFAT can refuse to duplicate
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| 74 | * the connection. VFS should then just make use of already existing phones and
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| 75 | * route its requests through them. To avoid paying the fibril creation price
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| 76 | * upon each request, exFAT might want to keep the connections open after the
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| 77 | * request has been completed.
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| 78 | */
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| 79 | static void exfat_connection(ipc_callid_t iid, ipc_call_t *icall)
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| 80 | {
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| 81 | if (iid) {
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| 82 | /*
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| 83 | * This only happens for connections opened by
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| 84 | * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
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| 85 | * created by IPC_M_CONNECT_TO_ME.
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| 86 | */
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| 87 | async_answer_0(iid, EOK);
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| 88 | }
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| 89 |
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| 90 | dprintf(NAME ": connection opened\n");
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| 91 | while (1) {
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| 92 | ipc_callid_t callid;
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| 93 | ipc_call_t call;
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| 94 |
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| 95 | callid = async_get_call(&call);
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| 96 | switch (IPC_GET_IMETHOD(call)) {
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| 97 | case IPC_M_PHONE_HUNGUP:
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| 98 | return;
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| 99 | case VFS_OUT_MOUNTED:
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| 100 | exfat_mounted(callid, &call);
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| 101 | break;
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| 102 | case VFS_OUT_MOUNT:
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| 103 | exfat_mount(callid, &call);
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| 104 | break;
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| 105 | case VFS_OUT_UNMOUNTED:
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| 106 | exfat_unmounted(callid, &call);
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| 107 | break;
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| 108 | case VFS_OUT_UNMOUNT:
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| 109 | exfat_unmount(callid, &call);
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| 110 | break;
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| 111 | case VFS_OUT_LOOKUP:
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| 112 | /* exfat_lookup(callid, &call); */
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| 113 | async_answer_0(callid, ENOTSUP);
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| 114 | break;
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| 115 | case VFS_OUT_READ:
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| 116 | /* exfat_read(callid, &call); */
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| 117 | async_answer_0(callid, ENOTSUP);
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| 118 | break;
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| 119 | case VFS_OUT_WRITE:
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| 120 | /* exfat_write(callid, &call); */
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| 121 | async_answer_0(callid, ENOTSUP);
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| 122 | break;
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| 123 | case VFS_OUT_TRUNCATE:
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| 124 | /* exfat_truncate(callid, &call); */
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| 125 | async_answer_0(callid, ENOTSUP);
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| 126 | break;
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| 127 | case VFS_OUT_STAT:
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| 128 | /* exfat_stat(callid, &call); */
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| 129 | async_answer_0(callid, ENOTSUP);
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| 130 | break;
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| 131 | case VFS_OUT_CLOSE:
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| 132 | /* exfat_close(callid, &call); */
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| 133 | async_answer_0(callid, ENOTSUP);
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| 134 | break;
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| 135 | case VFS_OUT_DESTROY:
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| 136 | /* exfat_destroy(callid, &call); */
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| 137 | async_answer_0(callid, ENOTSUP);
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| 138 | break;
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| 139 | case VFS_OUT_OPEN_NODE:
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| 140 | /* exfat_open_node(callid, &call); */
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| 141 | async_answer_0(callid, ENOTSUP);
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| 142 | break;
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| 143 | case VFS_OUT_SYNC:
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| 144 | /* exfat_sync(callid, &call); */
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| 145 | async_answer_0(callid, ENOTSUP);
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| 146 | break;
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| 147 | default:
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| 148 | async_answer_0(callid, ENOTSUP);
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| 149 | break;
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| 150 | }
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| 151 | }
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| 152 | }
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| 153 |
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| 154 | int main(int argc, char **argv)
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| 155 | {
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| 156 | int vfs_phone;
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| 157 | int rc;
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| 158 |
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| 159 | printf(NAME ": HelenOS exFAT file system server\n");
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| 160 |
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| 161 | rc = exfat_idx_init();
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| 162 | if (rc != EOK)
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| 163 | goto err;
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| 164 |
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| 165 | vfs_phone = service_connect_blocking(SERVICE_VFS, 0, 0);
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| 166 | if (vfs_phone < EOK) {
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| 167 | printf(NAME ": failed to connect to VFS\n");
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| 168 | return -1;
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| 169 | }
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| 170 |
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| 171 | rc = fs_register(vfs_phone, &exfat_reg, &exfat_vfs_info, exfat_connection);
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| 172 | if (rc != EOK) {
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| 173 | exfat_idx_fini();
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| 174 | goto err;
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| 175 | }
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| 176 |
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| 177 | printf(NAME ": Accepting connections\n");
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| 178 | task_retval(0);
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| 179 | async_manager();
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| 180 | /* not reached */
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| 181 | return 0;
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| 182 |
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| 183 | err:
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| 184 | printf(NAME ": Failed to register file system (%d)\n", rc);
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| 185 | return rc;
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| 186 | }
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| 187 |
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| 188 |
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| 189 | /**
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| 190 | * @}
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| 191 | */
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