From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Fri, 9 Jan 2015 03:15:53 +0000 (-0800)
Subject: f2fs: support fs shutdown
X-Git-Tag: omap-for-v4.2/o2_dc~90^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1abff93d01eddaab7ccdcf15f8cda4d91cbbcd9a;p=pandora-kernel.git

f2fs: support fs shutdown

This patch introduces a generic ioctl for fs shutdown, which was used by xfs.

If this shutdown is triggered, filesystem stops any further IOs according to the
following options.

1. FS_GOING_DOWN_FULLSYNC
 : this will flush all the data and dentry blocks, and do checkpoint before
   shutdown.

2. FS_GOING_DOWN_METASYNC
 : this will do checkpoint before shutdown.

3. FS_GOING_DOWN_NOSYNC
 : this will trigger shutdown as is.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

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