source: mainline/uspace/srv/fs/ext4fs/ext4fs.c

Last change on this file was 01900b6, checked in by Martin Decky <martin@…>, 5 years ago

Use an optional output argument instead of errno to propagate the error

The use of errno is troublesome in all other than top-level library
functions since the value in errno might get overwritten by subsequent
inner calls on the error path (e.g. cleanup, deallocation, etc.). The
optional output argument makes it possible to explicitly ignore the
error code if it is not needed, but still to pass it reliably back to
the original caller.

This change affecs async_connect_me_to(),
async_connect_me_to_blocking(), async_connect_kbox(), service_connect(),
service_connect_blocking() and loader_connect().

  • Property mode set to 100644
File size: 2.8 KB
Line 
1/*
2 * Copyright (c) 2012 Frantisek Princ
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup ext4fs
30 * @{
31 */
32/**
33 * @file ext4fs.c
34 * @brief Ext4 file system driver for HelenOS.
35 */
36
37#include <async.h>
38#include <errno.h>
39#include <libfs.h>
40#include <ns.h>
41#include <stdio.h>
42#include <task.h>
43#include <ipc/services.h>
44#include <str.h>
45#include <str_error.h>
46#include "ext4/ops.h"
47#include "../../vfs/vfs.h"
48
49#define NAME "ext4fs"
50
51vfs_info_t ext4fs_vfs_info = {
52 .name = NAME,
53 .instance = 0
54};
55
56int main(int argc, char **argv)
57{
58 printf("%s: HelenOS ext4 file system server\n", NAME);
59
60 if (argc == 3) {
61 if (!str_cmp(argv[1], "--instance"))
62 ext4fs_vfs_info.instance = strtol(argv[2], NULL, 10);
63 else {
64 printf("%s: Unrecognized parameters\n", NAME);
65 return 1;
66 }
67 }
68
69 errno_t rc;
70 async_sess_t *vfs_sess = service_connect_blocking(SERVICE_VFS,
71 INTERFACE_VFS_DRIVER, 0, &rc);
72 if (!vfs_sess) {
73 printf("%s: Failed to connect to VFS: %s\n", NAME, str_error(rc));
74 return 2;
75 }
76
77 rc = ext4_global_init();
78 if (rc != EOK) {
79 printf("%s: Global initialization failed: %s\n", NAME,
80 str_error(rc));
81 return rc;
82 }
83
84 rc = fs_register(vfs_sess, &ext4fs_vfs_info, &ext4_ops,
85 &ext4_libfs_ops);
86 if (rc != EOK) {
87 printf("%s: Failed to register file system: %s\n", NAME,
88 str_error(rc));
89 return rc;
90 }
91
92 printf("%s: Accepting connections\n", NAME);
93 task_retval(0);
94 async_manager();
95
96 /* Not reached */
97 return 0;
98}
99
100/**
101 * @}
102 */
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