David Sterba 80a773fbfc
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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