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From Michael Clark <>
Subject Re: VFS Proof of concept
Date Mon, 24 Dec 2007 08:26:26 GMT
Michael Clark wrote:
> Michael Clark wrote:
>> Attached is a proof of concept for an Apache VFS layer.
> There are some encapsulation boundary issues also, apr_dbm_open comes 
> to mind. Not sure how to handle this (one reason why I want to have an 
> mod_dav_fs_props_xattr).
> Anyway, I'll report back on my experiments...

I see quite a few problems with encapsulation boundaries. One big one is 

The only clean way I see of doing this is having the VFS API in apr.

Although for an httpd VFS impl we would still need to pass in 
request_rec for it to be useful - perhaps we could have something like this:

APR_DECLARE(apr_status_t) apr_vfs_stat(void *vfscontext,
                                       apr_finfo_t *finfo, 
                                       const char *fname, 
                                       apr_int32_t wanted,
                                       apr_pool_t *pool);

and in httpd, request_rec would always be passed for vfscontext 
(although vfscontext would be allowed to be NULL, just the VFS impls 
would not be able to have any request specific rules for IO generated 
from somewhere that wasn't able to pass a context).

I'm happy to keep down this path, assuming there is at least a slim 
possibility we could have a VFS in apr (of course without effecting any 
apps that don't use or need a VFS).


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