Re: How to locate struct file * from a bio?

[Al Viro <viro@ftp.linux.org.uk>]

On Wed, Jan 31, 2007 at 09:34:54AM -0500, Eddie Pettis wrote:
> Short question:  Is it possible to locate the struct file * associated
> with a bio?  If so, how?
 
Obviously impossible.  For one thing, there might very well be no inode,
let alone struct file, associated with bio in question (e.g. for any
filesystem metadata).  Moreover, the same on-disk object may get IO
without any stuct file at all (e.g. a directory) or with many struct
file (e.g. any file independently opened by several processes; no matter
how many of them do reads, we'll get stuff pulled into page cache the
same way (and once, not once per struct file).
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