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

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

On Jan 31 2007 16:18, Helge Hafting wrote:
> Eddie Pettis wrote:
>> Longer version:  I am working on a project that requires measuring the
>> popularity of each file in a filesystem.  I have made several attempts
>> to locate all the file reads by grepping for ->readpage() and
>> ->readpages() calls, but I am still missing several file reads.  I
>> have not yet looked for file writes.
>
> Why don't you tap into "open" instead?
> Here you can note who opens the file and if they open it for
> reading or writing.  If you really need the amount of data
> transferred, consider trapping the read and write syscalls too.

And to add the sugar on top: in case you can live without tracing / (root
filesystem), you can write your very own fuse filesystem layer in a few
minutes and trace every small thing. Or perhaps take an existing project
(aufs/unionfs) and enhance the module with some the wanted hooks, etc.


Jan
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