skbuff changes between 2.0 and 2.2

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struct skbuff used to have a count, which was just a reference count, but
that seems to be replaced with users. i see that alloc_skb increments
users now and it didn't before. count is gone. is this right?

there are two other changes i don't understand. dev_free_skb used to take
a mode flag and no longer does. skbuff used to also have a free flag in it
that is gone. how is this handled now?

also, there used to be a pointer data_skb that is gone. is the current skb
always the data skb now?

can you tell i'm a newbie and i'm trying to port something from 2.0 to 2.2? :)

thanks

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