Re: How to implement "filesystem operations tracker"?

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On Sep 20, 2013, at 8:39 PM, Anatol Pomozov wrote:

> Hi,
> 
> I have a following requirement: I start a process that performs a lot
> of filesystem operations. And I need to know what files my process was
> using - I need a breakdown by read operations and write operations.
> 
> A real-world example where such requirement needed is build-systems -
> I run "gcc foo.c" and I want to know what files are dependencies of
> this operation. I want to record the information and if any of
> dependencies is modified - I rerun "gcc" again.
> 
> There are build systems that track dependencies by mounting by-pass
> fuse filesystem and chrooting() there. e.g. tup
> https://github.com/gittup/tup  But fuse is relatively slow and it
> introduces additional buffer copy. I do not want to copy data to
> user-space and back, all I need is to record what files were
> stat()/open().
> 
> Is there a light-weight mechanism that allows to perform it?
> 

What about stackable file system approach (FiST)? As far as I can see,
this approach is used by UnionFS and eCryptfs. I suppose that such approach
can be applicable for your task.

With the best regards,
Vyacheslav Dubeyko.

> If not then I think of a simple filesystem that implements stat/open
> and bypasses all other operations to underlying filesystem
> implementation. stat/open information is saved and later userspace can
> receive this information e.g. via device file. Does this idea sound
> sane?
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