Subversion Repositories HelenOS

Rev

Rev 4584 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2006 decky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Martin Decky
2690 jermar 3
 * Copyright (c) 2008 Jakub Jermar
2006 decky 4
 * All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 *
10
 * - Redistributions of source code must retain the above copyright
11
 *   notice, this list of conditions and the following disclaimer.
12
 * - Redistributions in binary form must reproduce the above copyright
13
 *   notice, this list of conditions and the following disclaimer in the
14
 *   documentation and/or other materials provided with the distribution.
15
 * - The name of the author may not be used to endorse or promote products
16
 *   derived from this software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
 */
29
 
30
/** @addtogroup fs
31
 * @{
32
 */ 
33
 
34
/**
2529 jermar 35
 * @file	fat.c
36
 * @brief	FAT file system driver for HelenOS.
2006 decky 37
 */
38
 
2627 jermar 39
#include "fat.h"
2529 jermar 40
#include <ipc/ipc.h>
41
#include <ipc/services.h>
2531 jermar 42
#include <async.h>
2529 jermar 43
#include <errno.h>
44
#include <unistd.h>
2536 jermar 45
#include <stdio.h>
2643 jermar 46
#include <libfs.h>
2529 jermar 47
#include "../../vfs/vfs.h"
2006 decky 48
 
2532 jermar 49
 
2529 jermar 50
vfs_info_t fat_vfs_info = {
51
	.name = "fat",
52
};
53
 
2643 jermar 54
fs_reg_t fat_reg;
2543 jermar 55
 
2536 jermar 56
/**
57
 * This connection fibril processes VFS requests from VFS.
58
 *
59
 * In order to support simultaneous VFS requests, our design is as follows.
60
 * The connection fibril accepts VFS requests from VFS. If there is only one
61
 * instance of the fibril, VFS will need to serialize all VFS requests it sends
62
 * to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO
63
 * call. In that case, a new connection fibril will be created, which in turn
64
 * will accept the call. Thus, a new phone will be opened for VFS.
65
 *
66
 * There are few issues with this arrangement. First, VFS can run out of
67
 * available phones. In that case, VFS can close some other phones or use one
2627 jermar 68
 * phone for more serialized requests. Similarily, FAT can refuse to duplicate
2536 jermar 69
 * the connection. VFS should then just make use of already existing phones and
70
 * route its requests through them. To avoid paying the fibril creation price 
71
 * upon each request, FAT might want to keep the connections open after the
72
 * request has been completed.
2531 jermar 73
 */
2536 jermar 74
static void fat_connection(ipc_callid_t iid, ipc_call_t *icall)
2531 jermar 75
{
2536 jermar 76
	if (iid) {
77
		/*
78
		 * This only happens for connections opened by
79
		 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
80
		 * created by IPC_M_CONNECT_TO_ME.
81
		 */
2619 jermar 82
		ipc_answer_0(iid, EOK);
2536 jermar 83
	}
84
 
85
	dprintf("VFS-FAT connection established.\n");
2531 jermar 86
	while (1) {
87
		ipc_callid_t callid;
88
		ipc_call_t call;
89
 
90
		callid = async_get_call(&call);
2536 jermar 91
		switch  (IPC_GET_METHOD(call)) {
4562 jermar 92
		case IPC_M_PHONE_HUNGUP:
93
			return;
4584 jermar 94
		case VFS_OUT_MOUNTED:
3110 jermar 95
			fat_mounted(callid, &call);
96
			break;
4584 jermar 97
		case VFS_OUT_MOUNT:
3110 jermar 98
			fat_mount(callid, &call);
99
			break;
4584 jermar 100
		case VFS_OUT_LOOKUP:
2627 jermar 101
			fat_lookup(callid, &call);
102
			break;
4584 jermar 103
		case VFS_OUT_READ:
3307 jermar 104
			fat_read(callid, &call);
105
			break;
4584 jermar 106
		case VFS_OUT_WRITE:
3497 jermar 107
			fat_write(callid, &call);
108
			break;
4584 jermar 109
		case VFS_OUT_TRUNCATE:
3546 jermar 110
			fat_truncate(callid, &call);
111
			break;
4585 jermar 112
		case VFS_OUT_STAT:
113
			fat_stat(callid, &call);
114
			break;
4584 jermar 115
		case VFS_OUT_CLOSE:
4465 decky 116
			fat_close(callid, &call);
117
			break;
4584 jermar 118
		case VFS_OUT_DESTROY:
3636 jermar 119
			fat_destroy(callid, &call);
120
			break;
4584 jermar 121
		case VFS_OUT_OPEN_NODE:
4465 decky 122
			fat_open_node(callid, &call);
123
			break;
4584 jermar 124
		case VFS_OUT_SYNC:
4465 decky 125
			fat_sync(callid, &call);
126
			break;
2536 jermar 127
		default:
2619 jermar 128
			ipc_answer_0(callid, ENOTSUP);
2536 jermar 129
			break;
130
		}
2531 jermar 131
	}
132
}
133
 
2006 decky 134
int main(int argc, char **argv)
135
{
2532 jermar 136
	int vfs_phone;
3110 jermar 137
	int rc;
2529 jermar 138
 
3882 decky 139
	printf("fat: HelenOS FAT file system server.\n");
2532 jermar 140
 
3110 jermar 141
	rc = fat_idx_init();
142
	if (rc != EOK)
143
		goto err;
144
 
4007 decky 145
	vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);
146
	if (vfs_phone < EOK) {
147
		printf("fat: failed to connect to VFS\n");
148
		return -1;
2529 jermar 149
	}
150
 
2643 jermar 151
	rc = fs_register(vfs_phone, &fat_reg, &fat_vfs_info, fat_connection);
2531 jermar 152
	if (rc != EOK) {
3110 jermar 153
		fat_idx_fini();
154
		goto err;
2531 jermar 155
	}
2536 jermar 156
 
2644 jermar 157
	dprintf("FAT filesystem registered, fs_handle=%d.\n",
158
	    fat_reg.fs_handle);
2532 jermar 159
 
2568 jermar 160
	async_manager();
2534 jermar 161
	/* not reached */
2006 decky 162
	return 0;
3110 jermar 163
 
164
err:
165
	printf("Failed to register the FAT file system (%d)\n", rc);
166
	return rc;
2006 decky 167
}
168
 
169
/**
170
 * @}
171
 */