On 01/07/21 08:19, Christoph Hellwig wrote:
http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/scsi-ioctl
But more importantly, dm has no business interpreting the errors. Just
like how SG_IO processing generally does not look at the error and
just returns it to userspace and leaves error handling to the caller
so should be the decision to resubmit it in a multi-path setup.
The problem is that userspace does not have a way to direct the command
to a different path in the resubmission. It may not even have
permission to issue DM_TABLE_STATUS, or to access the /dev nodes for the
underlying paths, so without Martin's patches SG_IO on dm-mpath is
basically unreliable by design.
Paolo
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