null_blk: add option for managing IO timeouts

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Use the fault injection framework to provide a way for null_blk
to configure timeouts. This only works for queue_mode 1 and 2,
since the bio mode doesn't have code for tracking timeouts.

Let's say you want to have a 10% chance of timing out every
100,000 requests, and for 5 total timeouts, you could do:

modprobe null_blk timeout="100000,10,0,5"

This is useful for adding blktests to test that IO timeouts
are handled appropriately.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2018-01-10 09:06:23 -07:00

parent 8993d445df

commit 93b570464c

2 changed files with 43 additions and 4 deletions

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1

drivers/block/Kconfig

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46

drivers/block/null_blk.c

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