From: Christoph Hellwig <hch@lst.de>
Date: Wed, 14 Jan 2015 09:42:33 +0000 (+0100)
Subject: block_dev: only write bdev inode on close
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~103^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=564f00f6c03a9339c259eb71a5b3aa8ef7ff1c2e;p=pandora-kernel.git

block_dev: only write bdev inode on close

Since 018a17bdc865 ("bdi: reimplement bdev_inode_switch_bdi()") the
block device code writes out all dirty data whenever switching the
backing_dev_info for a block device inode.  But a block device inode can
only be dirtied when it is in use, which means we only have to write it
out on the final blkdev_put, but not when doing a blkdev_get.

Factoring out the write out from the bdi list switch prepares from
removing the list switch later in the series.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

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