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chattrcomes from e2fsprogs a file system utilities supports Ext2/3/4, it just make me more confused. further more, if kernel did not supportcoption, shouldchattrreturn an error or something?chattrdid it right, didn't fail. So why should it return an error? How is it supposed to know what the kernel will do with this information? On the other hand it would perhaps make sense for the kernel to return an error on trying to set this attribute.