fat: notify when discard is not supported
Change fatfs so that a warning is emitted when an attempt is made to mount a filesystem with the unsupported `discard' option. ext4 aready does this: http://patchwork.ozlabs.org/patch/192668/ Signed-off-by: Namjae Jeon <linkinjeon@gmail.com> Signed-off-by: Amit Sahrawat <amit.sahrawat83@gmail.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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