libbtrfsutil: add filesystem sync helpers

Namely, sync, start_sync, and wait_sync.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 103 insertions, 0 deletions

diff --git a/libbtrfsutil/filesystem.c b/libbtrfsutil/filesystem.c
new file mode 100644
index 00000000..dfd171bf
--- /dev/null
+++ b/libbtrfsutil/filesystem.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2018 Facebook
+ *
+ * This file is part of libbtrfsutil.
+ *
+ * libbtrfsutil is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libbtrfsutil is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libbtrfsutil.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <linux/btrfs.h>
+
+#include "btrfsutil_internal.h"
+
+PUBLIC enum btrfs_util_error btrfs_util_sync(const char *path)
+{
+	enum btrfs_util_error err;
+	int fd;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return BTRFS_UTIL_ERROR_OPEN_FAILED;
+
+	err = btrfs_util_sync_fd(fd);
+	SAVE_ERRNO_AND_CLOSE(fd);
+	return err;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_sync_fd(int fd)
+{
+	int ret;
+
+	ret = ioctl(fd, BTRFS_IOC_SYNC, NULL);
+	if (ret == -1)
+		return BTRFS_UTIL_ERROR_SYNC_FAILED;
+
+	return BTRFS_UTIL_OK;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_start_sync(const char *path,
+						   uint64_t *transid)
+{
+	enum btrfs_util_error err;
+	int fd;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return BTRFS_UTIL_ERROR_OPEN_FAILED;
+
+	err = btrfs_util_start_sync_fd(fd, transid);
+	SAVE_ERRNO_AND_CLOSE(fd);
+	return err;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_start_sync_fd(int fd, uint64_t *transid)
+{
+	int ret;
+
+	ret = ioctl(fd, BTRFS_IOC_START_SYNC, transid);
+	if (ret == -1)
+		return BTRFS_UTIL_ERROR_START_SYNC_FAILED;
+
+	return BTRFS_UTIL_OK;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_wait_sync(const char *path,
+						  uint64_t transid)
+{
+	enum btrfs_util_error err;
+	int fd;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return BTRFS_UTIL_ERROR_OPEN_FAILED;
+
+	err = btrfs_util_wait_sync_fd(fd, transid);
+	SAVE_ERRNO_AND_CLOSE(fd);
+	return err;
+}
+
+PUBLIC enum btrfs_util_error btrfs_util_wait_sync_fd(int fd, uint64_t transid)
+{
+	int ret;
+
+	ret = ioctl(fd, BTRFS_IOC_WAIT_SYNC, &transid);
+	if (ret == -1)
+		return BTRFS_UTIL_ERROR_WAIT_SYNC_FAILED;
+
+	return BTRFS_UTIL_OK;
+}