btrfs_sync_file  2926 fs/btrfs/ctree.h int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
btrfs_sync_file  3475 fs/btrfs/file.c 	.fsync		= btrfs_sync_file,
btrfs_sync_file  11100 fs/btrfs/inode.c 	.fsync		= btrfs_sync_file,
btrfs_sync_file   650 include/trace/events/btrfs.h TRACE_EVENT(btrfs_sync_file,