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SubjectRe: [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@redhat.com> 1159863226 -0700
committer Linus Torvalds <torvalds@g5.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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