108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2004 Daniel McNeil <daniel@osdl.org>
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* 2004 Open Source Development Lab
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* 2004 Marty Ridgeway <mridge@us.ibm.com>
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* Copyright (C) 2021 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
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*/
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/*\
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* [Description]
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*
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* Appends zeroed data to a file using O_DIRECT while a child processes are
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* doing buffered reads after seeking to the end of the file and checks if the
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* buffer reads always see zero.
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*/
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#define _GNU_SOURCE
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#include "tst_test.h"
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#include "common.h"
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static volatile int *run_child;
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static char *str_numchildren;
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static char *str_writesize;
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static char *str_appends;
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static int numchildren;
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static long long writesize;
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static int appends;
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static void setup(void)
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{
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numchildren = 16;
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writesize = 64 * 1024;
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appends = 1000;
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if (tst_parse_int(str_numchildren, &numchildren, 1, INT_MAX))
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tst_brk(TBROK, "Invalid number of children '%s'", str_numchildren);
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if (tst_parse_filesize(str_writesize, &writesize, 1, LLONG_MAX))
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tst_brk(TBROK, "Invalid write file size '%s'", str_writesize);
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if (tst_parse_int(str_appends, &appends, 1, INT_MAX))
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tst_brk(TBROK, "Invalid number of appends '%s'", str_appends);
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run_child = SAFE_MMAP(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
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}
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static void cleanup(void)
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{
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if (run_child) {
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*run_child = 0;
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SAFE_MUNMAP((void *)run_child, sizeof(int));
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}
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}
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static void run(void)
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{
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char *filename = "dio_append";
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int status;
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int i;
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*run_child = 1;
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for (i = 0; i < numchildren; i++) {
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if (!SAFE_FORK()) {
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io_read_eof(filename, run_child);
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return;
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}
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}
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tst_res(TINFO, "Parent append to file");
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io_append(filename, 0, O_DIRECT | O_WRONLY | O_CREAT, writesize, appends);
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if (!tst_remaining_runtime())
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tst_res(TINFO, "Test out of runtime, exiting");
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if (SAFE_WAITPID(-1, &status, WNOHANG))
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tst_res(TFAIL, "Non zero bytes read");
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else
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tst_res(TPASS, "All bytes read were zeroed");
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*run_child = 0;
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SAFE_UNLINK(filename);
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}
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static struct tst_test test = {
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.test_all = run,
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.setup = setup,
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.cleanup = cleanup,
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.needs_tmpdir = 1,
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.forks_child = 1,
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.max_runtime = 1800,
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.options = (struct tst_option[]) {
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{"n:", &str_numchildren, "Number of processes (default 16)"},
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{"w:", &str_writesize, "Write size for each append (default 64K)"},
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{"c:", &str_appends, "Number of appends (default 1000)"},
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{}
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},
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.skip_filesystems = (const char *[]) {
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"tmpfs",
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NULL
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},
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};
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