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995734ed12
For block cloning, if we mmap the cloned file and write from the map into the file, it triggers a panic in dbuf_redirty() on Linux. The same scenario causes data corruption on FreeBSD. Both these issues are fixed under PR#15656 and PR#15665. It would be good to add a test for this scenario in ZTS. The test program and issue was produced by @robn. Reviewed-by: Pawel Jakub Dawidek <pawel@dawidek.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Ameer Hamza <ahamza@ixsystems.com> Signed-off-by: Umer Saleem <usaleem@ixsystems.com> Closes #15717
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* This program clones the file, mmap it, and writes from the map into
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* file. This scenario triggers a panic on Linux in dbuf_redirty(),
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* which is fixed under PR#15656. On FreeBSD, the same test causes data
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* corruption, which is fixed by PR#15665.
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*
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* It would be good to test for this scenario in ZTS. This program and
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* issue was initially produced by @robn.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#ifdef __FreeBSD__
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#define loff_t off_t
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#endif
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ssize_t
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copy_file_range(int, loff_t *, int, loff_t *, size_t, unsigned int)
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__attribute__((weak));
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static int
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open_file(const char *source)
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{
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int fd;
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if ((fd = open(source, O_RDWR | O_APPEND)) < 0) {
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(void) fprintf(stderr, "Error opening %s\n", source);
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exit(1);
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}
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sync();
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return (fd);
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}
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static int
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clone_file(int sfd, long long size, const char *dest)
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{
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int dfd;
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if ((dfd = open(dest, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) < 0) {
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(void) fprintf(stderr, "Error opening %s\n", dest);
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exit(1);
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}
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if (copy_file_range(sfd, 0, dfd, 0, size, 0) < 0) {
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(void) fprintf(stderr, "copy_file_range failed\n");
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exit(1);
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}
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return (dfd);
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}
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static void *
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map_file(int fd, long long size)
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{
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void *p = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
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if (p == MAP_FAILED) {
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(void) fprintf(stderr, "mmap failed\n");
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exit(1);
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}
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return (p);
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}
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static void
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map_write(void *p, int fd)
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{
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if (pwrite(fd, p, 1024*128, 0) < 0) {
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(void) fprintf(stderr, "write failed\n");
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exit(1);
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}
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}
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int
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main(int argc, char **argv)
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{
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int sfd, dfd;
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void *p;
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struct stat sb;
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if (argc != 3) {
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(void) printf("usage: %s <input source file> "
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"<clone destination file>\n", argv[0]);
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exit(1);
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}
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sfd = open_file(argv[1]);
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if (fstat(sfd, &sb) == -1) {
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(void) fprintf(stderr, "fstat failed\n");
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exit(1);
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}
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dfd = clone_file(sfd, sb.st_size, argv[2]);
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p = map_file(dfd, sb.st_size);
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map_write(p, dfd);
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return (0);
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}
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