zfs zvol fsync()

[Richard Kojedzinszky]

Dear FS devs,

I run in to the problem that it seems that when a zvol is opened, and an 
fsync() is issued to is, nothing happens. Mainly I use a zvol to export it 
as an iscsi volume, and net/istgt issues fsync() to the device upon a scsi 
synchronize cache request.

Any comments on this?

Thanks in advance,

Kojedzinszky Richard