[SCSI] sysfs: add filter function to groups
This patch allows the various users of attribute_groups to selectively allow the appearance of group attributes. The primary consumer of this will be the transport classes in which we currently have elaborate attribute selection algorithms to do this same thing. Acked-by: NGreg KH <greg@kroah.com> Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>
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