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H A Dblk-sysfs.cdiff b8a9ae779f2c7049071034661e09cb7e1e82250c Fri Sep 11 22:44:29 CEST 2009 Jens Axboe <jens.axboe@oracle.com> block: don't assume device has a request list backing in nr_requests store

Stacked devices do not. For now, just error out with -EINVAL. Later
we could make the limit apply on stacked devices too, for throttling
reasons.

This fixes

5a54cd13353bb3b88887604e2c980aa01e314309

and should go into 2.6.31 stable as well.

Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>