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dm thin: add 'no_space_timeout' dm-thin-pool module param

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Commit 85ad643b ("dm thin: add timeout to stop out-of-data-space mode
holding IO forever") introduced a fixed 60 second timeout.  Users may
want to either disable or modify this timeout.

Allow the out-of-data-space timeout to be configured using the
'no_space_timeout' dm-thin-pool module param.  Setting it to 0 will
disable the timeout, resulting in IO being queued until more data space
is added to the thin-pool.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 3.14+
This commit is contained in:
Mike Snitzer
2014-05-20 13:38:33 -04:00
parent 4cdd2ad780
commit 80c578930c
2 changed files with 13 additions and 4 deletions
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5
Documentation/device-mapper/thin-provisioning.txt
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@@ -309,7 +309,10 @@ ii) Status
error_if_no_space|queue_if_no_space
If the pool runs out of data or metadata space, the pool will
either queue or error the IO destined to the data device. The
default is to queue the IO until more space is added.
default is to queue the IO until more space is added or the
'no_space_timeout' expires. The 'no_space_timeout' dm-thin-pool
module parameter can be used to change this timeout -- it
defaults to 60 seconds but may be disabled using a value of 0.
iii) Messages