md/raid10: extend r10bio devs to raid disks
Now it allocs r10bio->devs[conf->copies]. Discard bio needs to submit to all member disks and it needs to use r10bio. So extend to r10bio->devs[geo.raid_disks]. Reviewed-by: Coly Li <colyli@suse.de> Signed-off-by: Xiao Ni <xni@redhat.com> Signed-off-by: Song Liu <songliubraving@fb.com>
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