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dm flakey: Document "error_writes" feature

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Commit ef548c551e72 ("dm flakey: introduce "error_writes" feature")
added the ability to dm flakey to error out writes in contrast to
silently dropping it with 'drop_writes'. Unfortunately this feature
is not currently documented and one has to be either familiar with the
source code of dm flakey or check out xfstests sources to know of
this parameter. So document it.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Nikolay Borisov 2018-10-09 11:31:31 +03:00 committed by Jonathan Corbet
parent bc0e5262d3
commit 0c6c987f37
1 changed files with 4 additions and 0 deletions
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Documentation/device-mapper/dm-flakey.txt
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@ -33,6 +33,10 @@ Optional feature parameters:
All write I/O is silently ignored.
Read I/O is handled correctly.
error_writes:
All write I/O is failed with an error signalled.
Read I/O is handled correctly.
corrupt_bio_byte <Nth_byte> <direction> <value> <flags>:
During <down interval>, replace <Nth_byte> of the data of
each matching bio with <value>.