qa/btrfs/test_rmdir_async_snap

Attempt to reproduce btrfs bug when rmdirs race with an async snap.
Unsuccessful.  Best guess is that we need multiple threads to trigger.

Signed-off-by: Sage Weil <sage@newdream.net>

2 files changed, 62 insertions, 0 deletions

diff --git a/qa/btrfs/test_rmdir_async_snap b/qa/btrfs/test_rmdir_async_snap
new file mode 100755
index 00000000000..f128a6bb8ca
--- /dev/null
+++ b/qa/btrfs/test_rmdir_async_snap
diff --git a/qa/btrfs/test_rmdir_async_snap.c b/qa/btrfs/test_rmdir_async_snap.c
new file mode 100644
index 00000000000..5dafaacaaeb
--- /dev/null
+++ b/qa/btrfs/test_rmdir_async_snap.c
@@ -0,0 +1,62 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <string.h>
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+#include "../../src/os/btrfs_ioctl.h"
+
+struct btrfs_ioctl_vol_args_v2 va;
+struct btrfs_ioctl_vol_args vold;
+
+int main(int argc, char **argv)
+{
+	int num = 1000;
+	int i, r, fd;
+	char buf[30];
+
+	if (argc > 1)
+		num = atoi(argv[1]);
+	printf("will do %d iterations\n", num);
+	
+	fd = open(".", O_RDONLY);
+	vold.fd = 0;
+	strcpy(vold.name, "current");
+	r = ioctl(fd, BTRFS_IOC_SUBVOL_CREATE, (unsigned long int)&vold);
+	printf("create current ioctl got %d\n", r ? errno:0);
+	if (r)
+		return 1;
+
+	for (i=0; i<num; i++) {
+		sprintf(buf, "current/dir.%d", i);
+		r = mkdir(buf, 0755);
+		printf("mkdir got %d\n", r ? errno:0);
+		if (r)
+			return 1;
+	}
+
+	va.fd = open("current", O_RDONLY);
+	va.flags = BTRFS_SUBVOL_CREATE_ASYNC;
+	for (i=0; i<num; i++) {
+		system("/bin/cp /boot/vmlinuz-3.2.0-ceph-00142-g9e98323 current/foo");
+		sprintf(buf, "current/dir.%d", i);
+		r = rmdir(buf);
+		printf("rmdir got %d\n", r ? errno:0);
+		if (r)
+			return 1;
+
+		if (i % 10) continue;
+		sprintf(va.name, "snap.%d", i);
+		r = ioctl(fd, BTRFS_IOC_SNAP_CREATE_V2, (unsigned long long)&va);
+		printf("ioctl got %d\n", r ? errno:0);
+		if (r)
+			return 1;
+	}
+	return 0;
+}