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Implement support for FS_IOC_GETFSLABEL ioctl to read filesystem label.

Link: https://lkml.kernel.org/r/20240815074408.5550-4-konishi.ryusuke@gmail.com

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>