Messages in this thread |  | | Date | Tue, 6 Feb 2001 17:34:37 +0000 | From | "Stephen C. Tweedie" <> | Subject | Re: sync & asyck i/o |
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Hi,
On Tue, Feb 06, 2001 at 02:52:40PM +0000, Alan Cox wrote: > > According to the man page for fsync it copies in-core data to disk > > prior to its return. Does that take async i/o to the media in account? > > I.e. does it wait for completion of the async i/o to the disk? > > Undefined.
> In practice some IDE disks do write merging and small amounts of write > caching in the drive firmware so you cannot trust it 100%.
It's worth noting that it *is* defined unambiguously in the standards: fsync waits until all the data is hard on disk. Linux will obey that if it possibly can: only in cases where the hardware is actively lying about when the data has hit disk will the guarantee break down.
--Stephen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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