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selftests/damon: test debugfs file reads/writes with huge count

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commit b4a002889d upstream.

DAMON debugfs interface users were able to trigger warning by writing
some files with arbitrarily large 'count' parameter.  The issue is fixed
with commit db7a347b26 ("mm/damon/dbgfs: use '__GFP_NOWARN' for
user-specified size buffer allocation").  This commit adds a test case
for the issue in DAMON selftests to avoid future regressions.

Link: https://lkml.kernel.org/r/20211201150440.1088-11-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
SeongJae Park
2021-12-10 14:46:55 -08:00
committed by Greg Kroah-Hartman
parent a272f990cb
commit 581b097951
4 changed files with 61 additions and 0 deletions
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2
tools/testing/selftests/damon/.gitignore vendored Normal file
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@@ -0,0 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
huge_count_read_write

2
tools/testing/selftests/damon/Makefile
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@@ -1,6 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
# Makefile for damon selftests
TEST_GEN_FILES += huge_count_read_write
TEST_FILES = _chk_dependency.sh
TEST_PROGS = debugfs_attrs.sh

18
tools/testing/selftests/damon/debugfs_attrs.sh
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@@ -72,4 +72,22 @@ test_write_succ "$file" "" "$orig_content" "empty input"
test_content "$file" "$orig_content" "" "empty input written"
echo "$orig_content" > "$file"
# Test huge count read write
# ==========================
dmesg -C
for file in "$DBGFS/"*
do
./huge_count_read_write "$file"
done
if dmesg | grep -q WARNING
then
dmesg
exit 1
else
exit 0
fi
echo "PASS"

39
tools/testing/selftests/damon/huge_count_read_write.c Normal file
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@@ -0,0 +1,39 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Author: SeongJae Park <sj@kernel.org>
*/
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
void write_read_with_huge_count(char *file)
{
int filedesc = open(file, O_RDWR);
char buf[25];
int ret;
printf("%s %s\n", __func__, file);
if (filedesc < 0) {
fprintf(stderr, "failed opening %s\n", file);
exit(1);
}
write(filedesc, "", 0xfffffffful);
perror("after write: ");
ret = read(filedesc, buf, 0xfffffffful);
perror("after read: ");
close(filedesc);
}
int main(int argc, char *argv[])
{
if (argc != 2) {
fprintf(stderr, "Usage: %s <file>\n", argv[0]);
exit(1);
}
write_read_with_huge_count(argv[1]);
return 0;
}