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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
|
/*
* zfcp device driver
*
* Userspace interface for accessing the
* Access Control Lists / Control File Data Channel
*
* Copyright IBM Corporation 2008, 2009
*/
#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <asm/compat.h>
#include <asm/ccwdev.h>
#include "zfcp_def.h"
#include "zfcp_ext.h"
#include "zfcp_fsf.h"
#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
#define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
#define ZFCP_CFDC_CMND_UPLOAD 0x00010002
#define ZFCP_CFDC_DOWNLOAD 0x00000001
#define ZFCP_CFDC_UPLOAD 0x00000002
#define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
#define ZFCP_CFDC_IOC_MAGIC 0xDD
#define ZFCP_CFDC_IOC \
_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
/**
* struct zfcp_cfdc_data - data for ioctl cfdc interface
* @signature: request signature
* @devno: FCP adapter device number
* @command: command code
* @fsf_status: returns status of FSF command to userspace
* @fsf_status_qual: returned to userspace
* @payloads: access conflicts list
* @control_file: access control table
*/
struct zfcp_cfdc_data {
u32 signature;
u32 devno;
u32 command;
u32 fsf_status;
u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
u8 payloads[256];
u8 control_file[0];
};
static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
void __user *user_buffer)
{
unsigned int length;
unsigned int size = ZFCP_CFDC_MAX_SIZE;
while (size) {
length = min((unsigned int)size, sg->length);
if (copy_from_user(sg_virt(sg++), user_buffer, length))
return -EFAULT;
user_buffer += length;
size -= length;
}
return 0;
}
static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
struct scatterlist *sg)
{
unsigned int length;
unsigned int size = ZFCP_CFDC_MAX_SIZE;
while (size) {
length = min((unsigned int) size, sg->length);
if (copy_to_user(user_buffer, sg_virt(sg++), length))
return -EFAULT;
user_buffer += length;
size -= length;
}
return 0;
}
static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
{
char busid[9];
struct ccw_device *cdev;
struct zfcp_adapter *adapter;
snprintf(busid, sizeof(busid), "0.0.%04x", devno);
cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
if (!cdev)
return NULL;
adapter = zfcp_ccw_adapter_by_cdev(cdev);
put_device(&cdev->dev);
return adapter;
}
static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
{
switch (command) {
case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
break;
case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
break;
case ZFCP_CFDC_CMND_FULL_ACCESS:
fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
break;
case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
break;
case ZFCP_CFDC_CMND_UPLOAD:
fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
fsf_cfdc->option = 0;
break;
default:
return -EINVAL;
}
return 0;
}
static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
u8 __user *control_file)
{
int retval;
retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
if (retval)
return retval;
sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
command & ZFCP_CFDC_DOWNLOAD) {
retval = zfcp_cfdc_copy_from_user(sg, control_file);
if (retval) {
zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
return -EFAULT;
}
}
return 0;
}
static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
struct zfcp_fsf_req *req)
{
data->fsf_status = req->qtcb->header.fsf_status;
memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
sizeof(union fsf_status_qual));
memcpy(&data->payloads, &req->qtcb->bottom.support.els,
sizeof(req->qtcb->bottom.support.els));
}
static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
unsigned long arg)
{
struct zfcp_cfdc_data *data;
struct zfcp_cfdc_data __user *data_user;
struct zfcp_adapter *adapter;
struct zfcp_fsf_req *req;
struct zfcp_fsf_cfdc *fsf_cfdc;
int retval;
if (command != ZFCP_CFDC_IOC)
return -ENOTTY;
if (is_compat_task())
data_user = compat_ptr(arg);
else
data_user = (void __user *)arg;
if (!data_user)
return -EINVAL;
fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
if (!fsf_cfdc)
return -ENOMEM;
data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
if (!data) {
retval = -ENOMEM;
goto no_mem_sense;
}
retval = copy_from_user(data, data_user, sizeof(*data));
if (retval) {
retval = -EFAULT;
goto free_buffer;
}
if (data->signature != 0xCFDCACDF) {
retval = -EINVAL;
goto free_buffer;
}
retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);
adapter = zfcp_cfdc_get_adapter(data->devno);
if (!adapter) {
retval = -ENXIO;
goto free_buffer;
}
retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
data_user->control_file);
if (retval)
goto adapter_put;
req = zfcp_fsf_control_file(adapter, fsf_cfdc);
if (IS_ERR(req)) {
retval = PTR_ERR(req);
goto free_sg;
}
if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
retval = -ENXIO;
goto free_fsf;
}
zfcp_cfdc_req_to_sense(data, req);
retval = copy_to_user(data_user, data, sizeof(*data_user));
if (retval) {
retval = -EFAULT;
goto free_fsf;
}
if (data->command & ZFCP_CFDC_UPLOAD)
retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
fsf_cfdc->sg);
free_fsf:
zfcp_fsf_req_free(req);
free_sg:
zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
adapter_put:
zfcp_ccw_adapter_put(adapter);
free_buffer:
kfree(data);
no_mem_sense:
kfree(fsf_cfdc);
return retval;
}
static const struct file_operations zfcp_cfdc_fops = {
.open = nonseekable_open,
.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = zfcp_cfdc_dev_ioctl
#endif
};
struct miscdevice zfcp_cfdc_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "zfcp_cfdc",
.fops = &zfcp_cfdc_fops,
};
|
