From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 21 Mar 2014 01:17:14 +0000 (-0400)
Subject: dm thin: use per thin device deferred bio lists
X-Git-Tag: v3.15-rc1~69^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c140e1c4e23bdaf0a5c00b6a8b6d18f259d39a00;p=pandora-kernel.git

dm thin: use per thin device deferred bio lists

The thin-pool previously only had a single deferred_bios list that would
collect bios for all thin devices in the pool.  Split this per-pool
deferred_bios list out to per-thin deferred_bios_list -- doing so
enables increased parallelism when processing deferred bios.  And now
that each thin device has it's own deferred_bios_list we can sort all
bios in the list using logical sector.  The requeue code in error
handling path is also cleaner as a side-effect.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
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