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ef527958c6
If the destination file is mmaped and the mmaped region was already read, so it is cached, we need to update mmaped pages after successful clone using update_pages(). Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Pointed out by: Ka Ho Ng <khng@freebsd.org> Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net> Closes #15772
147 lines
3.0 KiB
C
147 lines
3.0 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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* Copyright (c) 2024 by Pawel Jakub Dawidek
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*/
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.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 void *
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mmap_file(int fd, size_t size)
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{
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void *p;
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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: %s\n", strerror(errno));
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exit(2);
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}
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return (p);
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}
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static void
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usage(const char *progname)
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{
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/*
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* -i cache input before copy_file_range(2).
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* -o cache input before copy_file_range(2).
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*/
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(void) fprintf(stderr, "usage: %s [-io] <input> <output>\n", progname);
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exit(3);
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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 dfd, sfd;
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size_t dsize, ssize;
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void *dmem, *smem, *ptr;
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off_t doff, soff;
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struct stat sb;
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bool cache_input, cache_output;
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const char *progname;
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int c;
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progname = argv[0];
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cache_input = cache_output = false;
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while ((c = getopt(argc, argv, "io")) != -1) {
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switch (c) {
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case 'i':
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cache_input = true;
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break;
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case 'o':
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cache_output = true;
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break;
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default:
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usage(progname);
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 2) {
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usage(progname);
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}
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sfd = open(argv[0], O_RDONLY);
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if (fstat(sfd, &sb) == -1) {
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(void) fprintf(stderr, "fstat failed: %s\n", strerror(errno));
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exit(2);
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}
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ssize = sb.st_size;
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smem = mmap_file(sfd, ssize);
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dfd = open(argv[1], O_RDWR);
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if (fstat(dfd, &sb) == -1) {
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(void) fprintf(stderr, "fstat failed: %s\n", strerror(errno));
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exit(2);
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}
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dsize = sb.st_size;
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dmem = mmap_file(dfd, dsize);
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/*
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* Hopefully it won't be compiled out.
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*/
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if (cache_input) {
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ptr = malloc(ssize);
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assert(ptr != NULL);
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memcpy(ptr, smem, ssize);
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free(ptr);
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}
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if (cache_output) {
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ptr = malloc(ssize);
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assert(ptr != NULL);
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memcpy(ptr, dmem, dsize);
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free(ptr);
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}
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soff = doff = 0;
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if (copy_file_range(sfd, &soff, dfd, &doff, ssize, 0) < 0) {
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(void) fprintf(stderr, "copy_file_range failed: %s\n",
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strerror(errno));
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exit(2);
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}
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exit(memcmp(smem, dmem, ssize) == 0 ? 0 : 1);
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}
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