1*78ae60b4SMartin Matuska /*
2*78ae60b4SMartin Matuska * CDDL HEADER START
3*78ae60b4SMartin Matuska *
4*78ae60b4SMartin Matuska * The contents of this file are subject to the terms of the
5*78ae60b4SMartin Matuska * Common Development and Distribution License (the "License").
6*78ae60b4SMartin Matuska * You may not use this file except in compliance with the License.
7*78ae60b4SMartin Matuska *
8*78ae60b4SMartin Matuska * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*78ae60b4SMartin Matuska * or https://opensource.org/licenses/CDDL-1.0.
10*78ae60b4SMartin Matuska * See the License for the specific language governing permissions
11*78ae60b4SMartin Matuska * and limitations under the License.
12*78ae60b4SMartin Matuska *
13*78ae60b4SMartin Matuska * When distributing Covered Code, include this CDDL HEADER in each
14*78ae60b4SMartin Matuska * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*78ae60b4SMartin Matuska * If applicable, add the following below this CDDL HEADER, with the
16*78ae60b4SMartin Matuska * fields enclosed by brackets "[]" replaced with your own identifying
17*78ae60b4SMartin Matuska * information: Portions Copyright [yyyy] [name of copyright owner]
18*78ae60b4SMartin Matuska *
19*78ae60b4SMartin Matuska * CDDL HEADER END
20*78ae60b4SMartin Matuska */
21*78ae60b4SMartin Matuska
22*78ae60b4SMartin Matuska /*
23*78ae60b4SMartin Matuska * This program clones the file, mmap it, and writes from the map into
24*78ae60b4SMartin Matuska * file. This scenario triggers a panic on Linux in dbuf_redirty(),
25*78ae60b4SMartin Matuska * which is fixed under PR#15656. On FreeBSD, the same test causes data
26*78ae60b4SMartin Matuska * corruption, which is fixed by PR#15665.
27*78ae60b4SMartin Matuska *
28*78ae60b4SMartin Matuska * It would be good to test for this scenario in ZTS. This program and
29*78ae60b4SMartin Matuska * issue was initially produced by @robn.
30*78ae60b4SMartin Matuska */
31*78ae60b4SMartin Matuska #ifndef _GNU_SOURCE
32*78ae60b4SMartin Matuska #define _GNU_SOURCE
33*78ae60b4SMartin Matuska #endif
34*78ae60b4SMartin Matuska
35*78ae60b4SMartin Matuska #include <fcntl.h>
36*78ae60b4SMartin Matuska #include <string.h>
37*78ae60b4SMartin Matuska #include <stdio.h>
38*78ae60b4SMartin Matuska #include <stdlib.h>
39*78ae60b4SMartin Matuska #include <unistd.h>
40*78ae60b4SMartin Matuska #include <errno.h>
41*78ae60b4SMartin Matuska #include <sys/stat.h>
42*78ae60b4SMartin Matuska #include <sys/mman.h>
43*78ae60b4SMartin Matuska
44*78ae60b4SMartin Matuska #ifdef __FreeBSD__
45*78ae60b4SMartin Matuska #define loff_t off_t
46*78ae60b4SMartin Matuska #endif
47*78ae60b4SMartin Matuska
48*78ae60b4SMartin Matuska ssize_t
49*78ae60b4SMartin Matuska copy_file_range(int, loff_t *, int, loff_t *, size_t, unsigned int)
50*78ae60b4SMartin Matuska __attribute__((weak));
51*78ae60b4SMartin Matuska
52*78ae60b4SMartin Matuska static int
open_file(const char * source)53*78ae60b4SMartin Matuska open_file(const char *source)
54*78ae60b4SMartin Matuska {
55*78ae60b4SMartin Matuska int fd;
56*78ae60b4SMartin Matuska if ((fd = open(source, O_RDWR | O_APPEND)) < 0) {
57*78ae60b4SMartin Matuska (void) fprintf(stderr, "Error opening %s\n", source);
58*78ae60b4SMartin Matuska exit(1);
59*78ae60b4SMartin Matuska }
60*78ae60b4SMartin Matuska sync();
61*78ae60b4SMartin Matuska return (fd);
62*78ae60b4SMartin Matuska }
63*78ae60b4SMartin Matuska
64*78ae60b4SMartin Matuska static int
clone_file(int sfd,long long size,const char * dest)65*78ae60b4SMartin Matuska clone_file(int sfd, long long size, const char *dest)
66*78ae60b4SMartin Matuska {
67*78ae60b4SMartin Matuska int dfd;
68*78ae60b4SMartin Matuska
69*78ae60b4SMartin Matuska if ((dfd = open(dest, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) < 0) {
70*78ae60b4SMartin Matuska (void) fprintf(stderr, "Error opening %s\n", dest);
71*78ae60b4SMartin Matuska exit(1);
72*78ae60b4SMartin Matuska }
73*78ae60b4SMartin Matuska
74*78ae60b4SMartin Matuska if (copy_file_range(sfd, 0, dfd, 0, size, 0) < 0) {
75*78ae60b4SMartin Matuska (void) fprintf(stderr, "copy_file_range failed\n");
76*78ae60b4SMartin Matuska exit(1);
77*78ae60b4SMartin Matuska }
78*78ae60b4SMartin Matuska
79*78ae60b4SMartin Matuska return (dfd);
80*78ae60b4SMartin Matuska }
81*78ae60b4SMartin Matuska
82*78ae60b4SMartin Matuska static void *
map_file(int fd,long long size)83*78ae60b4SMartin Matuska map_file(int fd, long long size)
84*78ae60b4SMartin Matuska {
85*78ae60b4SMartin Matuska void *p = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
86*78ae60b4SMartin Matuska if (p == MAP_FAILED) {
87*78ae60b4SMartin Matuska (void) fprintf(stderr, "mmap failed\n");
88*78ae60b4SMartin Matuska exit(1);
89*78ae60b4SMartin Matuska }
90*78ae60b4SMartin Matuska
91*78ae60b4SMartin Matuska return (p);
92*78ae60b4SMartin Matuska }
93*78ae60b4SMartin Matuska
94*78ae60b4SMartin Matuska static void
map_write(void * p,int fd)95*78ae60b4SMartin Matuska map_write(void *p, int fd)
96*78ae60b4SMartin Matuska {
97*78ae60b4SMartin Matuska if (pwrite(fd, p, 1024*128, 0) < 0) {
98*78ae60b4SMartin Matuska (void) fprintf(stderr, "write failed\n");
99*78ae60b4SMartin Matuska exit(1);
100*78ae60b4SMartin Matuska }
101*78ae60b4SMartin Matuska }
102*78ae60b4SMartin Matuska
103*78ae60b4SMartin Matuska int
main(int argc,char ** argv)104*78ae60b4SMartin Matuska main(int argc, char **argv)
105*78ae60b4SMartin Matuska {
106*78ae60b4SMartin Matuska int sfd, dfd;
107*78ae60b4SMartin Matuska void *p;
108*78ae60b4SMartin Matuska struct stat sb;
109*78ae60b4SMartin Matuska if (argc != 3) {
110*78ae60b4SMartin Matuska (void) printf("usage: %s <input source file> "
111*78ae60b4SMartin Matuska "<clone destination file>\n", argv[0]);
112*78ae60b4SMartin Matuska exit(1);
113*78ae60b4SMartin Matuska }
114*78ae60b4SMartin Matuska sfd = open_file(argv[1]);
115*78ae60b4SMartin Matuska if (fstat(sfd, &sb) == -1) {
116*78ae60b4SMartin Matuska (void) fprintf(stderr, "fstat failed\n");
117*78ae60b4SMartin Matuska exit(1);
118*78ae60b4SMartin Matuska }
119*78ae60b4SMartin Matuska dfd = clone_file(sfd, sb.st_size, argv[2]);
120*78ae60b4SMartin Matuska p = map_file(dfd, sb.st_size);
121*78ae60b4SMartin Matuska map_write(p, dfd);
122*78ae60b4SMartin Matuska return (0);
123*78ae60b4SMartin Matuska }
124