page cache doubt

["Luciano A. Stertz" <luciano@xxxxxxxxxxxx>]

	I'm trying to understand the page cache mechanism, but I have a doubt 
and couldn't find any documentation about it, neighter was able to 
understand reading the code. Hope that someone can help me and/or 
indicate some doc.
	Every inode has an address_space, that keeps a list of cached pages in 
a digital tree. So far so good. Now the doubt: the inode struct has two 
address_spaces, i_mapping and i_data. As far as I could understand, 
i_mapping is the address_space I'm looking for, since it is passed to 
the readpage method, but what is i_data function?

	TIA,
		Luciano Stertz

--
Luciano A. Stertz
luciano@xxxxxxxxxxxx
T&T Engenheiros Associados Ltda
http://www.tteng.com.br
Fone/Fax (51) 3224 8425

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