[Ocfs2-test-devel] [RFC][PATCH] ocfs2-test: add concurrent flock() test case

Coly Li coly.li at suse.de
Fri Dec 12 01:49:00 PST 2008


This script is initialized by Sunil, to verify lockres mastery race in flock(). For further
information of the lockres mastery race issue, read Novell bugzilla page:
https://bugzilla.novell.com/show_bug.cgi?id=425491

Sunil, Marcos and Tristan, could you kindly give me a SOB ?

Signed-off-by: Coly Li <coly.li at suse.de>
---
 programs/flock_tests/Makefile                 |    2 +-
 programs/flock_tests/concurrent_flock_test.pl |   33 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletions(-)

diff --git a/programs/flock_tests/Makefile b/programs/flock_tests/Makefile
index 8b6bc5c..82659ec 100644
--- a/programs/flock_tests/Makefile
+++ b/programs/flock_tests/Makefile
@@ -15,7 +15,7 @@ DIST_FILES = $(SOURCES)

 BIN_PROGRAMS = flock_unit_test

-BIN_EXTRA = run_flock_unit_test.py
+BIN_EXTRA = run_flock_unit_test.py concurrent_flock_test.pl

 flock_unit_test: $(OBJECTS)
 	$(LINK)
diff --git a/programs/flock_tests/concurrent_flock_test.pl
b/programs/flock_tests/concurrent_flock_test.pl
new file mode 100644
index 0000000..ac45dfc
--- /dev/null
+++ b/programs/flock_tests/concurrent_flock_test.pl
@@ -0,0 +1,33 @@
+#!/usr/bin/perl
+/* the perl script encloses the 20 fork loop into another loop that changes the
+ * filename. To startwith, touch 5000 files(test.flock%d). umount and mount
+ * again. This will drop the caches. Now before running any ls, run flock.pl.
+ * It will spawn 20 processes to flock() each file and wait till the 20 forks
+ * have exited before letting loose another 20 for the next file. (Makesure
+ * you have another node or two or more that have just mounted that volume.).
+ */
+
+use warnings;
+use Fcntl ':flock';
+
+$| = 1;
+
+for (my $y = 0; $y < 5000; $y ++) {
+	/* modify path here for your environment */
+	$file = '/ocfs2/test.lock' . $y;
+
+	printf "[%s] %s\n", $$, $file;
+
+	for (my $x = 0; $x < 20; $x ++) {
+		my $pid = fork();
+		if ($pid == 0) {
+			my $fh;
+			open($fh, ">> $file") or die("Can't open '$file': $!");
+			printf "[%s] lock %s: %s\n", $$, $file,
+			flock($fh, LOCK_EX) ? 'done' : $!;
+			close($fh);
+			exit(0);
+		}
+	}
+	while (wait > 0) { ; }
+}

-- 
Coly Li
SuSE PRC Labs



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