Re: [PATCH] 2.5.41, cciss, add rescan disk ioctl (6 of 5 :-)

From: Alan Cox (
Date: Wed Oct 09 2002 - 10:31:41 EST

On Wed, 2002-10-09 at 15:46, Stephen Cameron wrote:
> This patch adds the CCISS_RESCANDISK ioctl which is meant to be used in a
> configuration like Steeleye's Lifekeeper. Two hosts connect to the storage,
> one reserves disks. The 2nd will not be able to read the partition
> information because of the reservations. In the event the 1st system fails,
> the 2nd can detect this, (via special hardware + software typically) and then
> take over the storage and rescan he disks via this ioctl.
> Applies to 2.5.41 (after applying my prior 4 patches to 2.5.4[01] )

Why not use the existing rescanning ioctls like BLKRRPART - what else is
different to need a custom ioctl?

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