Messages in this thread | | | Date | Mon, 6 Apr 2009 17:19:31 -0400 | From | Theodore Tso <> | Subject | Re: [PATCH 0/8][RFC] IO latency/throughput fixes |
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On Mon, Apr 06, 2009 at 01:12:08PM -0700, Hua Zhong wrote: > Grr..making writeback as default would break people's setup that relies on > the ordered semantics, especially in the embedded world. It's a big no-no.
I've added workarounds for 2.6.30 that provide the replace-via-rename and replace-via-truncate workarounds for ext3 data=writeback cases. See commits e7c8f507 and f7ab34ea.
There won't be an implied fsync for newly created files, yes, but you could have crashed 5 seconds earlier, at which point you would have lost the newly created file anyway. Replace-via-rename and replace-via-truncate solves the problem for applications which are editing pre-existing files, which was most of people's complaints about depending on data=ordered semantics.
- Ted
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