Calling fsync() does not necessarily ensure that the entry in the directory containing the file has also reached disk. For that an explicit fsync() on a file
descriptor for the directory is also needed.
I am wondering is directory sync is essential after below steps if I want to assure the file can be retrieved after system crash?
1) create file A
2) write file A
3) fsync(file A)
--------------------------------> fsync(parent directory) [Is it essential to make the inode linked to parent directory?]
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