Hi,
On Sat, Apr 08, 2000 at 07:42:52PM +0200, Jamie Lokier wrote:
> Alan Cox wrote:
> > No data should get more than about 30 seconds behind by default. With the
> > -o sync option on ext2fs mounts it should be virtually instantaneous.
>
> -o sync is inappropriate for slow media as it ends up not coalescing
> writes, doing multiple writes to the same block, and excessively
> serialising reads and writes.
Exactly the sorts of problem which supermount fixes: that code just does a
full fsync_dev() of the device once the last writer on the filesystem has
closed the device. It even defers completion of the close() of the last
writer until the sync has completed, so that if you copy anything to the
device, you can be sure that the media is synced up once the copy
completes.
--Stephen
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