inconsistencies in nfs(5)

[Chuck Lever <chuck.lever@oracle.com>]

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Trying to get a handle on how individual mount options behave, I'm 
rewriting nfs(5).  Jeff Layton pointed out a few inconsistencies and 
I've found a few more.  I'd like to resolve these:

+  The default "intr" behavior for nfs and nfs4 is not the same. 
According to the code, for nfs the default is "nointr" and for nfs4 the 
default is "intr".  Is this the desired behavior?

+  "nocto" and "noac" are listed as valid nfs4 mount options.  I believe 
"nocto" can't be supported by the NFSv4 protocol because an OPEN on the 
wire is always necessary.  Is "noac" supported for nfs4 file systems?

+  Is the "noacl" option still supported in 2.6.latest?  What exactly 
does it do, and what are the consequences of using it?

+  The description for the "bg" option claims "After a mount operation 
is backgrounded, all subsequent mounts on the same NFS server will be 
backgrounded immediately, without first attempting the mount."  I don't 
think there's logic to do that in either the legacy mount command or in 
mount.nfs.  Should this text be removed from the man page?

Likely more to come...

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