From: David Sterba <dsterba@suse.cz>
Date: Wed, 7 May 2014 16:17:06 +0000 (+0200)
Subject: btrfs: retrieve more info from FS_INFO ioctl
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~54^2~69
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=80a773fbfc2d6b5b2478377e8ac271d495f55e73;p=pandora-kernel.git

btrfs: retrieve more info from FS_INFO ioctl

Provide the basic information about filesystem through the ioctl:
* b-tree node size (same as leaf size)
* sector size
* expected alignment of CLONE_RANGE and EXTENT_SAME ioctl arguments

Backward compatibility: if the values are 0, kernel does not provide
this information, the applications should ignore them.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
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