[dm-devel] [PATCH] dm flakey: Document "error_writes" feature

[John Pittman]

Hi Nikolay, I sent this one to Mike at the end of September.("dm
flakey: add error_writes to documentation -
"https://www.redhat.com/archives/dm-devel/2018-September/msg00146.html).
Unsure if he has picked it up or not.

Best Regards,

John Pittman
Customer Engagement and Experience
Red Hat Inc.

On Wed, Oct 10, 2018 at 4:20 AM Nikolay Borisov <nborisov at suse.com> wrote:
>
> 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 at suse.com>
> ---
>  Documentation/device-mapper/dm-flakey.txt | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/Documentation/device-mapper/dm-flakey.txt b/Documentation/device-mapper/dm-flakey.txt
> index c43030718cef..9f0e247d0877 100644
> --- a/Documentation/device-mapper/dm-flakey.txt
> +++ b/Documentation/device-mapper/dm-flakey.txt
> @@ -33,6 +33,10 @@ Table 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>.
> --
> 2.7.4
>
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