Re: datalog including written data?

[Wouter Verhelst <w@uter.be>]

Hi Manfred,

On Mon, Dec 20, 2021 at 05:48:35PM +0100, Manfred Spraul wrote:
> Hello together,
> 
> for a stress test application, I would like to extend the datalog to include
> the actual written data.
> 
> The use case is to replay parts of the log, similar to what I wrote for a
> NAND driver a few years ago:
> 
> https://patchwork.ozlabs.org/project/linux-mtd/cover/20171206085039.27164-1-dirk.behme@de.bosch.com/
> 
> a) Has anyone done that before?

Not me.

> b) As first observation:
> 
> https://github.com/NetworkBlockDevice/nbd/blob/master/nbd-server.c#L294
> 
> The server supports
> 
> NBD_CMD_READ, NBD_CMD_WRITE, NBD_CMD_DISC, NBD_CMD_FLUSH, NBD_CMD_TRIM,
> NBD_CMD_WRITE_ZEROES
> 
> https://github.com/NetworkBlockDevice/nbd/blob/master/nbd-trdump.c#L71
> 
> The trace dump utility supports
> 
> NBD_CMD_READ, NBD_CMD_WRITE, NBD_CMD_DISC, NBD_CMD_FLUSH
> 
> -> TRIM and WRITE_ZEROES is missing.
> 
> 
> Should I create a patch that adds TRIM and WRITE_ZEROES to nbd-trdump?

Yes, that might be nice. nbd-trdump hasn't been looked at in a while,
which is why TRIM and WRITE_ZEROES haven't been added to it yet.

Thanks for your effort,

-- 
     w@uter.{be,co.za}
wouter@{grep.be,fosdem.org,debian.org}