commit 80a773fbfc2d6b5b2478377e8ac271d495f55e73
author David Sterba <dsterba@suse.cz> Wed May 07 18:17:06 2014 +0200
committer Chris Mason <clm@fb.com> Mon Jun 09 17:20:27 2014 -0700
tree 3e32cba85039f51ae9dc5c189dbeb5f58de04989
parent 7d824b6f9cf28917d8a05891ef423fb0e4e34c69

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>