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I have a question reguarding mmap(2)ed files which are modified.

After reading the manual page of msync(2), I have the impression that
if invoked with the MS_SYNC flag, it should be safe enough not to need
a further fdatasync(2)/fsync_range(2) call afterwards?

And how about the metadata?  Would sync(2) be the only true way to
ensure it's synchronized (considering fsync(2) seems fd-specific)?

Also, I am auditing an application which seems to modify mmaped files
but which does not use msync(2) at all (and I can see that an older
fsync(2) call was used, but is now commented out).  Should this be
considered a bug?


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