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-btrfs-show-super - show btrfs superblock information stored in devices
-*btrfs-show-super* [options] <dev> [<dev>...]
-*btrfs-show-super* is used to print the information of superblock,
-you can specify which mirror to print out.
-By default, every device's first superblock will be printed out.
-Mainly used for debug purpose.
-Print full superblock information.
-Including the system chunk array and backup roots.
-Print information of all superblocks.
-If this option is given, '-i' option will be ignored.
--i <super_mirror>::
-Specify which mirror to print out.
-<super_mirror> is between 0 and 2.
-If several '-i <super_mirror>' are given, only the last one is valid.
-Attempt to print the superblock even if no superblock magic is found. May end
--s <bytenr>::
-specify offset to a superblock in a non-standard location at 'bytenr', useful
-for debugging (disables the '-f' option)
-*btrfs-show-super* will return 0 if no error happened.
-If any problems happened, 1 will be returned.