qa: btrfs: test_async_snap

Hammer on the btrfs async sync/snap create/remove ioctls.

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

2 files changed, 83 insertions, 1 deletions

diff --git a/qa/btrfs/Makefile b/qa/btrfs/Makefile
index 8e82d30916b..354948c16bc 100644
--- a/qa/btrfs/Makefile
+++ b/qa/btrfs/Makefile
@@ -1,6 +1,6 @@
 CFLAGS = -Wall -Wextra -D_GNU_SOURCE
 
-TARGETS = clone_range
+TARGETS = clone_range test_async_snap
 
 .c:
 	$(CC) $(CFLAGS) $@.c -o $@
diff --git a/qa/btrfs/test_async_snap.c b/qa/btrfs/test_async_snap.c
new file mode 100644
index 00000000000..ffa4fe71598
--- /dev/null
+++ b/qa/btrfs/test_async_snap.c
@@ -0,0 +1,82 @@
+#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 max = 4;
+
+void check_return(int r)
+{
+	if (r < 0) {
+		printf("********* failed with %d %s ********\n", errno, strerror(errno));
+		exit(1);
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int num = 100;
+
+	if (argc > 1)
+		num = atoi(argv[1]);
+	printf("will do %d iterations\n", num);
+
+        int cwd = open(".", O_RDONLY);
+        printf("cwd = %d\n", cwd);
+        while (1) {
+		if (rand() % 10 == 0) {
+			__u64 transid;
+			int r;
+			printf("sync starting\n");
+			r = ioctl(cwd, BTRFS_IOC_START_SYNC, &transid);
+			check_return(r);
+			printf("sync started, transid %lld, waiting\n", transid);
+			r = ioctl(cwd, BTRFS_IOC_WAIT_SYNC, &transid);
+			check_return(r);
+			printf("sync finished\n");	
+		}
+
+                int i = rand() % max;
+                struct stat st;
+                va.fd = cwd;
+                sprintf(va.name, "test.%d", i);
+                va.transid = 0;
+                int r = stat(va.name, &st);
+                if (r < 0) {
+			if (rand() % 3 == 0) {
+				printf("snap create (sync) %s\n", va.name);
+				va.flags = 0;
+				r = ioctl(cwd, BTRFS_IOC_SNAP_CREATE_V2, &va);
+				check_return(r);
+			} else {
+				printf("snap create (async) %s\n", va.name);
+				va.flags = BTRFS_SUBVOL_CREATE_ASYNC;
+				r = ioctl(cwd, BTRFS_IOC_SNAP_CREATE_V2, &va);
+				check_return(r);
+				printf("snap created, transid %lld\n", va.transid);
+				if (rand() % 2 == 0) {
+					printf("waiting for async snap create\n");
+					r = ioctl(cwd, BTRFS_IOC_WAIT_SYNC, &va.transid);
+					check_return(r);
+				}
+                        }
+                } else {
+                        printf("snap remove %s\n", va.name);
+			vold.fd = va.fd;
+			strcpy(vold.name, va.name);
+                        r = ioctl(cwd, BTRFS_IOC_SNAP_DESTROY, &vold);
+			check_return(r);
+                }
+        }
+}