103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/*
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* This is a reproducer copied from one of LKML patch submission,
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* which subject is
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*
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* [PATCH] mlock: revert the optimization for dirtying pages and triggering writeback.
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*
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* "In 5ecfda0, we do some optimization in mlock, but it causes
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* a very basic test case(attached below) of mlock to fail. So
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* this patch revert it with some tiny modification so that it
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* apply successfully with the lastest 38-rc2 kernel."
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*
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* Copyright (C) 2010 Red Hat, Inc.
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it
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* is free of the rightful claim of any third person regarding
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* infringement or the like. Any license provided herein, whether
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* implied or otherwise, applies only to this software file. Patent
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* licenses, if any, provided herein do not apply to combinations of
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* this program with other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include "test.h"
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#include "safe_macros.h"
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#include "config.h"
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char *TCID = "mlock04";
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int TST_TOTAL = 1;
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#include <sys/mman.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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int fd, file_len = 40960;
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char *testfile = "test_mlock";
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static void setup(void);
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static void cleanup(void);
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int main(void)
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{
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char *buf;
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int lc;
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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buf = mmap(NULL, file_len, PROT_WRITE, MAP_SHARED, fd, 0);
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if (buf == MAP_FAILED)
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tst_brkm(TBROK | TERRNO, cleanup, "mmap");
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if (mlock(buf, file_len) == -1)
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tst_brkm(TBROK | TERRNO, cleanup, "mlock");
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tst_resm(TINFO, "locked %d bytes from %p", file_len, buf);
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if (munlock(buf, file_len) == -1)
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tst_brkm(TBROK | TERRNO, cleanup, "munlock");
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SAFE_MUNMAP(cleanup, buf, file_len);
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}
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tst_resm(TPASS, "test succeeded.");
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cleanup();
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tst_exit();
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}
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static void setup(void)
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{
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tst_tmpdir();
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fd = SAFE_OPEN(cleanup, testfile, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
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SAFE_FTRUNCATE(cleanup, fd, file_len);
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TEST_PAUSE;
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}
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static void cleanup(void)
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{
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close(fd);
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tst_rmdir();
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}
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