btrfs-extent-same - directly access the btrfs-extent-same ioctl

btrfs-extent-sameextent-len and all offsets should be specified in bytes.

       btrfs-extent-same - directly access the btrfs-extent-same ioctl

filesystems(5)btrfs(8)

Version 0.01                                       March 2014                               btrfs-extent-same(8)

btrfs-extent-sameextent-lenfile1offset1...