Re: syncing a directory

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

As educational and interesting to read the discussion among experts  
regarding the reliability of fsync_range(fd, FDISKSYNC) may be to me,  
I failed to extract from it the kind of information I initially tried  
to gather. So may I humbly rephrase my question as follows:

Given some combination of filesystem, disk interface et al., there is  
a certain level of confidence to be achieved by fsync() that, after  
modifying a bunch of bytes in a specific file, those bytes are to be  
found in the modified state after a crash.
So, given the same combination of filesystem etc., is there a method  
to obtain a comparable level of confidence, that, after moving a  
bunch of files to a specific directory, those files are still to be  
found where they have been moved to after a crash? Other than fsync() 
ing each of those files, I mean.

Or, put another way: Which implementation would NetBSD experts  
suggest me to propose to the author of dovecot as a substitute to  
fsync()ing maildir/new, which works (at least, doesn't fail) on  
Linux, in order to improve maildir integrity?