Writes to files opened with the O_SYNC flag set will behave as if the O_DSYNC flag had been used instead.

This can result in better performance without compromising data safety.

However timestamp updates from O_SYNC writes can be lost if the system crashes. Use osyncisosync to disable this setting.

When inode clusters are emptied of inodes, keep them around on the disk.

Use the noikeep option to force empty inode clusters to be returned to the free space pool.