[PATCH] remove read-only/immutable checks from fat_truncate

[PATCH] remove read-only/immutable checks from fat_truncate

From: Christoph Hellwig <hch@lst.de>

There's two callers:

 - the truncate path via notify_change, ->setattr, vmtruncate.  We
   already check for permissions here at the upper level
 - fat_delete_inode.  This one looks bogus to me - even if we delete
   an read-only or immutable inode we want to free the space allocated
   by it, else you leak disk blocks.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>