From: Nicholas Swenson <nks@daterainc.com>
Date: Fri, 10 Jan 2014 00:03:04 +0000 (-0800)
Subject: bcache: Fix moving_gc deadlocking with a foreground write
X-Git-Tag: v3.15-rc1~134^2^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da415a096fc06e49d1a15f7a06bcfe6ad44c5d38;p=pandora-kernel.git

bcache: Fix moving_gc deadlocking with a foreground write

Deadlock happened because a foreground write slept, waiting for a bucket
to be allocated. Normally the gc would mark buckets available for invalidation.
But the moving_gc was stuck waiting for outstanding writes to complete.
These writes used the bcache_wq, the same queue foreground writes used.

This fix gives moving_gc its own work queue, so it was still finish moving
even if foreground writes are stuck waiting for allocation. It also makes
work queue a parameter to the data_insert path, so moving_gc can use its
workqueue for writes.

Signed-off-by: Nicholas Swenson <nks@daterainc.com>
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
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