[Gluster-devel] Moratorium on new patch acceptance

[Jeff Darcy]

> * fdatasync is issued only once at the end of all writes when conv=fdatasync
> * for some strange reason no fsync or fdatasync is issued at all when
> conv=sync

That's because of my typo.  I meant oflag=sync, not conv=sync.  Sorry.

> So, using conv=fdatasync in the test cannot prevent write-parallelism induced
> by write-behind. Parallelism would've been prevented only if dd had issued
> fdatasync after each write or opened the file with O_SYNC.

See above.  I just checked with strace, and oflag=sync does cause the output
file to be opened with O_SYNC.