Messages in this thread |  | | Date | Tue, 2 Jan 2001 12:57:52 -0500 (EST) | From | stewart@neuron ... | Subject | Re: sync() broken for raw devices in 2.4.x?? |
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Thanks for the correction. I am using a buffered block device then, not a real synchronous raw device.
stewart
On Tue, 2 Jan 2001, Andi Kleen wrote:
> On Mon, Jan 01, 2001 at 07:50:31PM -0500, stewart@neuron.com wrote: > > > > I have a sync()/fdatasync() intensive application that is designed to work > > on both raw files and raw partitions. Today I upgraded my kernel to the > > new pre-release and found that my benchmark program would no longer finish > > when handed a raw partition. I've written a small Java program (my app is > > in Java) which demonstrates the bug. Make foo.dat a raw scsi partition to > > re-produce. In my case it's "mknod foo.dat b 8 18". > > Just a minor correction: this is not a raw partition, but a buffered blockdevice. > If you want a real rawdevice (where sync is a noop because all IO goes > synchronously to disk) you need to bind a character raw device to the > block device first using the raw util. > > >From a quick look sync_buffers() [which implements fsync on block devices] > has not changed significantly between 2.2 and 2.4 and uses the same algorithm. > > -Andi >
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