ceph: strengthen rsize/wsize/readdir_max_bytes validation
The check (intval < PAGE_SIZE) will involve type cast, so even when specifying negative value to rsize/wsize/readdir_max_bytes, it will pass the validation check successfully. Signed-off-by: NChengguang Xu <cgxu519@gmx.com> Reviewed-by: NIlya Dryomov <idryomov@gmail.com> Signed-off-by: NIlya Dryomov <idryomov@gmail.com>
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