Re: [PATCH v3 1/5] add metadata_incore ioctl in vfs

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

On Thu, 20 Jan 2011 13:38:18 +0800 Shaohua Li <shaohua.li@xxxxxxxxx> wrote:

> > ext2, minix and probably others create an address_space for each
> > directory.  Heaven knows what xfs does (for example).
> yes, this is for one directiory, but the all files's metadata are in
> block_dev address_space.
> I thought you mean there are several block_dev address_space like
> address_space in some filesystems, which doesn't fit well in my
> implementation. for ext like filesystem, there is only one
> address_space. for filesystems with several address_space, my proposal
> is map them to a virtual big address_space in the new ioctls.

ext2 and minixfs (and I think sysv and ufs) have a separate
address_space for each directory.  I don't see how those can be
represented with a single "virtual big address_space" - we also need
identifiers in there so each directory's address_space can be created
and appropriately populated.


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