From: Tejun Heo <tj@kernel.org>
Date: Fri, 22 May 2015 21:13:24 +0000 (-0400)
Subject: blkcg: implement bio_associate_blkcg()
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~117^2~75
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d933cf096e3aea15f1aec8297657b7a846fab63;p=pandora-kernel.git

blkcg: implement bio_associate_blkcg()

Currently, a bio can only be associated with the io_context and blkcg
of %current using bio_associate_current().  This is too restrictive
for cgroup writeback support.  Implement bio_associate_blkcg() which
associates a bio with the specified blkcg.

bio_associate_blkcg() leaves the io_context unassociated.
bio_associate_current() is updated so that it considers a bio as
already associated if it has a blkcg_css, instead of an io_context,
associated with it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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