[dm-devel] [PATCH v2 1/2] libmultipath: Allow discovery of USB devices

[Martin Wilck]

On Sat, 2020-09-26 at 18:26 +0200, Frank Meinl wrote:
> This change adds a new configuration option allow_usb_devices. It is
> disabled by default, so that the behavior of existing setups is not
> changed. If enabled (via multipath.conf), USB devices will be found
> during device discovery and can be used for multipath setups.
> 
> Without this option, multipath currently ignores all USB drives,
> which
> is convenient for most users. (refer also to commit 51957eb)
> 
> However, it can be beneficial to use the multipath dm-module even if
> there is only a single path to an USB attached storage. In
> combination
> with the option 'queue_if_no_path', such a setup survives a temporary
> device disconnect without any severe consequences for the running
> applications. All I/O is queued until the device reappears.
> 
> Signed-off-by: Frank Meinl <frank.meinl at live.de>

Sorry, I forgot in the previous review: You must add an entry for 
SCSI_PROTOCOL_USB in snprint_path_protocol(). Apart from that, this
looks OK.

Regards,
Martin