1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2006
4 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
5 * Author: Yi Yang <yyangcdl@cn.ibm.com>
6 */
7
8 #define _GNU_SOURCE
9
10 #include <errno.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/types.h>
14 #include <sys/poll.h>
15
16 #include "tst_test.h"
17 #include "lapi/fcntl.h"
18 #include "lapi/splice.h"
19 #include "lapi/vmsplice.h"
20
21 #define TEST_BLOCK_SIZE (1<<17) /* 128K */
22
23 #define TESTFILE "vmsplice_test_file"
24
25 static int fd_out;
26 static char buffer[TEST_BLOCK_SIZE];
27
check_file(void)28 static void check_file(void)
29 {
30 int i;
31 char vmsplicebuffer[TEST_BLOCK_SIZE];
32
33 fd_out = SAFE_OPEN(TESTFILE, O_RDONLY);
34 SAFE_READ(1, fd_out, vmsplicebuffer, TEST_BLOCK_SIZE);
35
36 for (i = 0; i < TEST_BLOCK_SIZE; i++) {
37 if (buffer[i] != vmsplicebuffer[i])
38 break;
39 }
40
41 if (i < TEST_BLOCK_SIZE)
42 tst_res(TFAIL, "Wrong data read from the buffer at %i", i);
43 else
44 tst_res(TPASS, "Written data has been read back correctly");
45
46 SAFE_CLOSE(fd_out);
47 }
48
vmsplice_test(void)49 static void vmsplice_test(void)
50 {
51 int pipes[2];
52 long written;
53 int ret;
54 int fd_out;
55 struct iovec v;
56 loff_t offset;
57
58 v.iov_base = buffer;
59 v.iov_len = TEST_BLOCK_SIZE;
60
61 fd_out = SAFE_OPEN(TESTFILE, O_WRONLY | O_CREAT | O_TRUNC, 0644);
62 SAFE_PIPE(pipes);
63
64 struct pollfd pfd = {.fd = pipes[1], .events = POLLOUT};
65 offset = 0;
66
67 while (v.iov_len) {
68 /*
69 * in a real app you'd be more clever with poll of course,
70 * here we are basically just blocking on output room and
71 * not using the free time for anything interesting.
72 */
73 if (poll(&pfd, 1, -1) < 0)
74 tst_brk(TBROK | TERRNO, "poll() failed");
75
76 written = vmsplice(pipes[1], &v, 1, 0);
77 if (written < 0) {
78 tst_brk(TBROK | TERRNO, "vmsplice() failed");
79 } else {
80 if (written == 0) {
81 break;
82 } else {
83 v.iov_base += written;
84 v.iov_len -= written;
85 }
86 }
87
88 ret = splice(pipes[0], NULL, fd_out, &offset, written, 0);
89 if (ret < 0)
90 tst_brk(TBROK | TERRNO, "splice() failed");
91 //printf("offset = %lld\n", (long long)offset);
92 }
93
94 SAFE_CLOSE(pipes[0]);
95 SAFE_CLOSE(pipes[1]);
96 SAFE_CLOSE(fd_out);
97
98 check_file();
99 }
100
setup(void)101 static void setup(void)
102 {
103 int i;
104
105 for (i = 0; i < TEST_BLOCK_SIZE; i++)
106 buffer[i] = i & 0xff;
107 }
108
cleanup(void)109 static void cleanup(void)
110 {
111 if (fd_out > 0)
112 SAFE_CLOSE(fd_out);
113 }
114
115 static struct tst_test test = {
116 .setup = setup,
117 .cleanup = cleanup,
118 .test_all = vmsplice_test,
119 .needs_tmpdir = 1,
120 .skip_filesystems = (const char *const []) {
121 "nfs",
122 NULL
123 },
124 .min_kver = "2.6.17",
125 };
126