locking against myself in getcacheblk()?

[YONETANI Tomokazu]

On Mon, Dec 27, 2010 at 09:21:08AM -0800, Matthew Dillon wrote:
>     Here's a bug fix for the second bug... the recursive lock --mmap issue.
>     Please test it (with the originally suggested #if 0 workaround removed).
>     This fix is for HAMMER, if it works I'll do the same thing w/ NFS and UFS.
> 
> 	fetch http://apollo.backplane.com/DFlyMisc/buf01.patch

Apparently the previous versions (I haven't tried other versions than
2.8-RELEASE yet) are affected too, and the above patch seems to fix it
as well.