Messages in this thread | | | Subject | Re: [PATCH] barrier patch set | From | Chris Mason <> | Date | Wed, 31 Mar 2004 09:21:35 -0500 |
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On Wed, 2004-03-31 at 09:08, Stephen C. Tweedie wrote: > Hi, > > On Tue, 2004-03-30 at 23:21, Jeff Garzik wrote: > > > For IDE, O_DIRECT and O_SYNC can use special "FUA" commands, which don't > > return until the data is on the platter. > > fsync() is still really nasty, because that can require that we wait on > IO that was submitted by the VM before we knew that there was a > synchronous IO wait coming.
Yes, it gets ugly in a hurry. Jeff, look at the whole thread about the O_DIRECT read vs buffered write races. I don't think we can use FUA for fsync or O_SYNC without using it for every write.
We might be able to get away with using it on O_DIRECT.
-chris
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