1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
// SPDX-License-Identifier: GPL-2.0
/*
* Hypervisor filesystem for Linux on s390 - debugfs interface
*
* Copyright IBM Corp. 2010
* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
*/
#include <linux/slab.h>
#include "hypfs.h"
static struct dentry *dbfs_dir;
static struct hypfs_dbfs_data *hypfs_dbfs_data_alloc(struct hypfs_dbfs_file *f)
{
struct hypfs_dbfs_data *data;
data = kmalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return NULL;
data->dbfs_file = f;
return data;
}
static void hypfs_dbfs_data_free(struct hypfs_dbfs_data *data)
{
data->dbfs_file->data_free(data->buf_free_ptr);
kfree(data);
}
static ssize_t dbfs_read(struct file *file, char __user *buf,
size_t size, loff_t *ppos)
{
struct hypfs_dbfs_data *data;
struct hypfs_dbfs_file *df;
ssize_t rc;
if (*ppos != 0)
return 0;
df = file_inode(file)->i_private;
mutex_lock(&df->lock);
data = hypfs_dbfs_data_alloc(df);
if (!data) {
mutex_unlock(&df->lock);
return -ENOMEM;
}
rc = df->data_create(&data->buf, &data->buf_free_ptr, &data->size);
if (rc) {
mutex_unlock(&df->lock);
kfree(data);
return rc;
}
mutex_unlock(&df->lock);
rc = simple_read_from_buffer(buf, size, ppos, data->buf, data->size);
hypfs_dbfs_data_free(data);
return rc;
}
static long dbfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct hypfs_dbfs_file *df = file_inode(file)->i_private;
long rc;
mutex_lock(&df->lock);
if (df->unlocked_ioctl)
rc = df->unlocked_ioctl(file, cmd, arg);
else
rc = -ENOTTY;
mutex_unlock(&df->lock);
return rc;
}
static const struct file_operations dbfs_ops = {
.read = dbfs_read,
.llseek = no_llseek,
.unlocked_ioctl = dbfs_ioctl,
};
void hypfs_dbfs_create_file(struct hypfs_dbfs_file *df)
{
df->dentry = debugfs_create_file(df->name, 0400, dbfs_dir, df,
&dbfs_ops);
mutex_init(&df->lock);
}
void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df)
{
debugfs_remove(df->dentry);
}
static int __init hypfs_dbfs_init(void)
{
int rc = -ENODATA;
dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
if (hypfs_diag_init())
goto fail_dbfs_exit;
if (hypfs_vm_init())
goto fail_hypfs_diag_exit;
hypfs_sprp_init();
if (hypfs_diag0c_init())
goto fail_hypfs_sprp_exit;
rc = hypfs_fs_init();
if (rc)
goto fail_hypfs_diag0c_exit;
return 0;
fail_hypfs_diag0c_exit:
hypfs_diag0c_exit();
fail_hypfs_sprp_exit:
hypfs_sprp_exit();
hypfs_vm_exit();
fail_hypfs_diag_exit:
hypfs_diag_exit();
pr_err("Initialization of hypfs failed with rc=%i\n", rc);
fail_dbfs_exit:
debugfs_remove(dbfs_dir);
return rc;
}
device_initcall(hypfs_dbfs_init)
|
