Messages in this thread |  | | Date | Mon, 24 Sep 2001 15:37:00 +0100 | From | "Stephen C. Tweedie" <> | Subject | Re: [PATCH] Significant performace improvements on reiserfs systems, kupdated bugfixes |
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Hi,
On Fri, Sep 21, 2001 at 03:26:27PM +0200, Matthias Andree wrote:
> Be careful! MTAs rely on this behaviour on fsync(). The official > consensus on ReiserFS and ext3 on current Linux 2.4.x kernels (x >= 9) > is that "any synchronous operation flushes all pending operations", and > if that is changed, you MUST make sure that the changed ReiserFS/ext3fs > still make all the guarantees that softupdated BSD file systems make, > lest you want people to run their mail queues off "sync" disks.
Reiserfs and ext3 have their own IO ordering --- they don't commit transactions until the log writes for _all_ of the blocks in those transactions have been acknowledged. Reordering outstanding IOs won't affect the fsync guarantees at all.
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