WA Hirofumi <hirofumi@mail.parknet.co.jp> 1244464790 +0900

fat: split fat_generic_ioctl

Split up fat_generic_ioctl and add separate functions for the two
implemented ioctls.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
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