Xen devel - Mar 2011 - [PATCH xen-unstable] blktap1 -- adapt user space to linux-2.6.18-xen MAX_TAP_DEV (256)

Hi,

as of xen-unstable 22961:c5d121fd35c0 and linux-2.6.18-xen 
1072:9e1f69c2e956, there''s a discrepancy between the number of the 
blktap1 devices the kernel and the tools support. This patch intends to 
pull up the tools side to the same limit (256).

While testing the related RHBZ (680407), additional (run time) limits 
were encountered.

One is the fs.aio-max-nr sysctl. A hint is logged about raising it; the 
patch fixes a typo (which is absent from the corresponding blktap2 code) 
in this message.

The other run time limit is one of the four default xenstore quotas. (I 
didn''t investigate which one exactly.) Though the quotas can be 
overridden with command line options, the patch quadruples all the 
defaults. In the process I noticed there was a mismatch between the set 
of command line options xenstored accepts and the set it displays as 
usage help; the patch tries to adjust the latter to the former 
(entry-watch --> watch-nb).

I think the patch is small enough not to be split up in a series; please 
pick whichever hunk you deem worthy.

Thanks for considering,
lacos


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