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97fe86837c
Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #17584
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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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 http://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) 2025, Klara, Inc.
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*/
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/*
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* Tests async writeback behaviour. Creates a file, maps it into memory, and
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* dirties every page within it. Then, calls ftruncate() to collapse the file
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* back down to 0. This causes the kernel to begin writeback on the dirty
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* pages so they can be freed, before it can complete the ftruncate() call.
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* None of these are sync operations, so they should avoid the various "force
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* flush" codepaths.
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define _pdfail(f, l, s) \
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do { perror("[" f "#" #l "] " s); exit(2); } while (0)
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#define pdfail(str) _pdfail(__FILE__, __LINE__, str)
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int
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main(int argc, char **argv) {
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if (argc != 3) {
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printf("usage: mmap_ftruncate <file> <size>\n");
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exit(2);
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}
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const char *file = argv[1];
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char *end;
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off_t sz = strtoull(argv[2], &end, 0);
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if (end == argv[2] || *end != '\0' || sz == 0) {
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fprintf(stderr, "E: invalid size");
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exit(2);
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}
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int fd = open(file, O_CREAT|O_TRUNC|O_RDWR, S_IRUSR|S_IWUSR);
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if (fd < 0)
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pdfail("open");
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if (ftruncate(fd, sz) < 0)
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pdfail("ftruncate");
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char *p = mmap(NULL, sz, PROT_WRITE, MAP_SHARED, fd, 0);
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if (p == MAP_FAILED)
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pdfail("mmap");
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for (off_t off = 0; off < sz; off += 4096)
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p[off] = 1;
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if (ftruncate(fd, 0) < 0)
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pdfail("ftruncate");
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if (munmap(p, sz) < 0)
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pdfail("munmap");
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close(fd);
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return (0);
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}
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