linux-kernel - Re: [RFC 0/3] Convert XFS inode hashes to radix trees

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Message-ID: <20061003212335.GA13120@tuatara.stupidest.org>
Date:	Tue, 3 Oct 2006 14:23:35 -0700
From:	Chris Wedgwood <cw@...f.org>
To:	David Chinner <dgc@....com>
Cc:	xfs-dev@....com, xfs@....sgi.com, dhowells@...hat.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/3] Convert XFS inode hashes to radix trees

On Tue, Oct 03, 2006 at 04:06:10PM +1000, David Chinner wrote:

> Overall, the patchset removes more than 200 lines of code from the
> xfs inode caching and lookup code and provides more consistent
> scalability for large numbers of cached inodes. The only down side
> is that it limits us to 32 bit inode numbers of 32 bit platforms due
> to the way the radix tree uses unsigned longs for it's indexes

    commit afefdbb28a0a2af689926c30b94a14aea6036719
    tree 6ee500575cac928cd90045bcf5b691cf2b8daa09
    parent 1d32849b14bc8792e6f35ab27dd990d74b16126c
    author David Howells <dhowells@...hat.com> 1159863226 -0700
    committer Linus Torvalds <torvalds@...osdl.org> 1159887820 -0700

    [PATCH] VFS: Make filldir_t and struct kstat deal in 64-bit inode numbers

    These patches make the kernel pass 64-bit inode numbers internally when
    communicating to userspace, even on a 32-bit system.  They are required
    because some filesystems have intrinsic 64-bit inode numbers: NFS3+ and XFS
    for example.  The 64-bit inode numbers are then propagated to userspace
    automatically where the arch supports it.
    [...]

Doing this will mean XFS won't be able to support 32-bit inodes on
32-bit platforms the above (merged) patch --- though given that cheap
64-bit systems are now abundant does anyone really care?
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