nullfs changes MFC

[Baptiste Daroussin]

On Sat, Dec 08, 2012 at 03:01:09AM +0200, Konstantin Belousov wrote:
> Hi,
> I am going to merge latest batch of the nullfs improvements into
> stable/9. This will bring up significant performance enchancements due
> to use of the shared locks for lookups if the lower layer supports it,
> much better caching on the nullfs layer, and proper handling of the text
> segments on the nullfs. Also, it should improve the error recovery and
> some corner cases with locking.
> 
> Unfortunately, the merge would break KBI for VFS, since it needs 5 new
> VOP slots, and only three spares are left. We already are very liberal
> with the VFS KBI, so I do not feel that the merge is not acceptable, due
> to the benefits it brings to the nullfs.
> 
> The merge is available at 
> http://people.freebsd.org/~kib/misc/nullfs_9.1.patch


Sorry I haven't checked the latest zfs related MFC, but for some time there was
an issue with nullfs improvements and zfs, will this mfc be synchronize with the
mfc of the related zfs fixes?

regards,
Bapt
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