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
|
dnl #
dnl # Check for available iov_iter functionality.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_IOV_ITER], [
ZFS_LINUX_TEST_SRC([iov_iter_types], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
int type __attribute__ ((unused)) =
ITER_IOVEC | ITER_KVEC | ITER_BVEC | ITER_PIPE;
])
ZFS_LINUX_TEST_SRC([iov_iter_init], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
struct iovec iov;
unsigned long nr_segs = 1;
size_t count = 1024;
iov_iter_init(&iter, WRITE, &iov, nr_segs, count);
])
ZFS_LINUX_TEST_SRC([iov_iter_init_legacy], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
struct iovec iov;
unsigned long nr_segs = 1;
size_t count = 1024;
size_t written = 0;
iov_iter_init(&iter, &iov, nr_segs, count, written);
])
ZFS_LINUX_TEST_SRC([iov_iter_advance], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t advance = 512;
iov_iter_advance(&iter, advance);
])
ZFS_LINUX_TEST_SRC([iov_iter_revert], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t revert = 512;
iov_iter_revert(&iter, revert);
])
ZFS_LINUX_TEST_SRC([iov_iter_fault_in_readable], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t size = 512;
int error __attribute__ ((unused));
error = iov_iter_fault_in_readable(&iter, size);
])
ZFS_LINUX_TEST_SRC([iov_iter_count], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
size_t bytes __attribute__ ((unused));
bytes = iov_iter_count(&iter);
])
ZFS_LINUX_TEST_SRC([copy_to_iter], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
char buf[512] = { 0 };
size_t size = 512;
size_t bytes __attribute__ ((unused));
bytes = copy_to_iter((const void *)&buf, size, &iter);
])
ZFS_LINUX_TEST_SRC([copy_from_iter], [
#include <linux/fs.h>
#include <linux/uio.h>
],[
struct iov_iter iter = { 0 };
char buf[512] = { 0 };
size_t size = 512;
size_t bytes __attribute__ ((unused));
bytes = copy_from_iter((void *)&buf, size, &iter);
])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_IOV_ITER], [
enable_vfs_iov_iter="yes"
AC_MSG_CHECKING([whether iov_iter types are available])
ZFS_LINUX_TEST_RESULT([iov_iter_types], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_TYPES, 1,
[iov_iter types are available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
dnl #
dnl # 'iov_iter_init' available in Linux 3.16 and newer.
dnl # 'iov_iter_init_legacy' available in Linux 3.15 and older.
dnl #
AC_MSG_CHECKING([whether iov_iter_init() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_init], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_INIT, 1,
[iov_iter_init() is available])
],[
ZFS_LINUX_TEST_RESULT([iov_iter_init_legacy], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_INIT_LEGACY, 1,
[iov_iter_init() is available])
],[
ZFS_LINUX_TEST_ERROR([iov_iter_init()])
])
])
AC_MSG_CHECKING([whether iov_iter_advance() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_advance], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_ADVANCE, 1,
[iov_iter_advance() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether iov_iter_revert() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_revert], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_REVERT, 1,
[iov_iter_revert() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether iov_iter_fault_in_readable() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_fault_in_readable], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_FAULT_IN_READABLE, 1,
[iov_iter_fault_in_readable() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether iov_iter_count() is available])
ZFS_LINUX_TEST_RESULT([iov_iter_count], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IOV_ITER_COUNT, 1,
[iov_iter_count() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether copy_to_iter() is available])
ZFS_LINUX_TEST_RESULT([copy_to_iter], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_COPY_TO_ITER, 1,
[copy_to_iter() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
AC_MSG_CHECKING([whether copy_from_iter() is available])
ZFS_LINUX_TEST_RESULT([copy_from_iter], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_COPY_FROM_ITER, 1,
[copy_from_iter() is available])
],[
AC_MSG_RESULT(no)
enable_vfs_iov_iter="no"
])
dnl #
dnl # As of the 4.9 kernel support is provided for iovecs, kvecs,
dnl # bvecs and pipes in the iov_iter structure. As long as the
dnl # other support interfaces are all available the iov_iter can
dnl # be correctly used in the uio structure.
dnl #
AS_IF([test "x$enable_vfs_iov_iter" = "xyes"], [
AC_DEFINE(HAVE_VFS_IOV_ITER, 1,
[All required iov_iter interfaces are available])
])
])
|
