[Gluster-devel] regressions due to 64-bit ext4 directory cookies

Theodore Ts'o tytso at mit.edu
Wed Feb 13 15:14:55 UTC 2013

On Wed, Feb 13, 2013 at 08:31:31AM -0500, J. Bruce Fields wrote:
> They're assuming they can take the high bits of the cookie for their own
> use.
> (In more detail: they're spreading a single directory across multiple
> nodes, and encoding a node ID into the cookie they return, so they can
> tell which node the cookie came from when they get it back.)
> That works if you assume the cookie is an "offset" bounded above by some
> measure of the directory size, hence unlikely to ever use the high
> bits....

Right, but why wouldn't a nfs export option solave the problem for

Basically, it would be nice if we did not have to degrade locally
running userspace applications by globally turning off 64-bit telldir
cookies just because there are some broken cluster file systems and
nfsv3 clients out there.  And if we are only turning off 64-bit
cookies for NFS, wouldn't it make sense to make this be a NFS export
option, as opposed to a mount option?


					- Ted

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