btrfs_ioc_test.c: added a unitest

src/btrfs_ioc_test.c

@@ -0,0 +1,169 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <asm/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include "os/btrfs_ioctl.h"
+
+void do_open_wr(const char *fname, int *fd)
+{
+	*fd = open(fname, O_WRONLY | O_CREAT, 0644);
+	if (*fd < 0) {
+		perror("open");
+		exit(1);
+	}
+}
+
+void do_open_rd(const char *fname, int *fd)
+{
+	*fd = open(fname, O_RDONLY);
+	if (*fd < 0) {
+		perror("open");
+		exit(1);
+	}
+}
+
+void do_lseek(int fd, int ofs)
+{
+	int rc = lseek(fd, ofs, SEEK_SET);
+	if (rc < 0) {
+		perror("lseek");
+		exit(1);
+	}
+}
+
+void do_write(int fd, int len)
+{
+	char *buf = malloc(len);
+	int rc;
+	if (!buf) {
+		printf("not enough memory\n");
+		exit(1);
+	}
+
+	memset(buf, 0, len);
+	rc = write(fd, buf, len);
+	if (rc < 0) {
+		perror("write");
+		exit(1);
+	}
+
+	if (rc != len) {
+		printf("invalid number of bytes written\n");
+		exit(1);
+	}
+
+	free(buf);
+}
+
+void do_link(const char *old, const char *new)
+{
+	int rc = link(old, new);
+	if (rc < 0) {
+		perror("link");
+		exit(1);
+	}
+}
+
+void do_clone_range(int from, int to, int off, int len)
+{
+	struct btrfs_ioctl_clone_range_args a;
+	int r;
+
+	a.src_fd = from;
+	a.src_offset = off;
+	a.src_length = len;
+	a.dest_offset = off;
+	r = ioctl(to, BTRFS_IOC_CLONE_RANGE, &a);
+	if (r < 0) {
+		perror("ioctl");
+		exit(1);
+	}
+}
+
+void do_snap_async(int fd, const char *name, unsigned long long *transid)
+{
+	struct btrfs_ioctl_async_vol_args async_args;
+	struct btrfs_ioctl_vol_args volargs;
+	int r;
+
+	strcpy(volargs.name, name);
+	volargs.fd = fd;
+
+	async_args.args = &volargs;
+	async_args.transid = transid;
+
+	r = ioctl(fd, BTRFS_IOC_SNAP_CREATE_ASYNC, &async_args);
+
+	if (r < 0) {
+		perror("ioctl");
+		exit(1);
+	}
+}
+
+void do_snap_destroy(int fd, const char *name)
+{
+	struct btrfs_ioctl_vol_args volargs;
+	int r;
+
+	strcpy(volargs.name, name);
+	volargs.fd = 0;
+
+	r = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &volargs);
+
+	if (r < 0) {
+		perror("snap_destroy: ioctl");
+		exit(1);
+	}
+}
+
+void do_snap_wait(int fd, unsigned long long transid)
+{
+	int r = ioctl(fd, BTRFS_IOC_WAIT_SYNC, &transid);
+	if (r < 0) {
+		perror("do_snap_wait: ioctl");
+		exit(1);
+	}
+}
+
+void usage_exit(char *arg)
+{
+	printf("usage: %s <btrfs_base> <snap_name>\n", arg);
+	exit(1);
+}
+
+#define TEMP_FILENAME "temp"
+#define DEST_FILENAME "dest"
+#define SRC_FILENAME "src"
+
+int main(int argc, char *argv[])
+{
+	const char *base_dir;
+	const char *snap_name;
+
+	int fd;
+	int i;
+	unsigned long long transid;
+
+	if (argc < 3)
+		usage_exit(argv[0]);
+
+	base_dir = argv[1];
+	snap_name = argv[2];
+
+	for (i=0; i<10; i++) {
+		printf("%d\n", i);
+		do_open_rd(base_dir, &fd);
+		do_snap_async(fd, snap_name, &transid);
+		sleep(2);
+		//do_snap_wait(fd, transid);
+		do_snap_destroy(fd, snap_name);
+		close(fd);
+	}
+	
+	return 0;
+}