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authorMartin Wilck <mwilck@suse.com>2020-04-20 22:29:09 +0200
committerMike Snitzer <snitzer@redhat.com>2020-05-15 16:29:35 +0200
commit2361ae595352dec015d14292f1b539242d8446d6 (patch)
tree47bc57c7c09db1c151828c6ffe20689dfe46afc0 /Kconfig
parentdm crypt: support using encrypted keys (diff)
downloadlinux-2361ae595352dec015d14292f1b539242d8446d6.tar.xz
linux-2361ae595352dec015d14292f1b539242d8446d6.zip
dm mpath: switch paths in dm_blk_ioctl() code path
SCSI LUN passthrough code such as qemu's "scsi-block" device model pass every IO to the host via SG_IO ioctls. Currently, dm-multipath calls choose_pgpath() only in the block IO code path, not in the ioctl code path (unless current_pgpath is NULL). This has the effect that no path switching and thus no load balancing is done for SCSI-passthrough IO, unless the active path fails. Fix this by using the same logic in multipath_prepare_ioctl() as in multipath_clone_and_map(). Note: The allegedly best path selection algorithm, service-time, still wouldn't work perfectly, because the io size of the current request is always set to 0. Changing that for the IO passthrough case would require the ioctl cmd and arg to be passed to dm's prepare_ioctl() method. Signed-off-by: Martin Wilck <mwilck@suse.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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