[uml-devel] 2.4.24-2 UML problems with hostfs ClearCase mounts [ was Re: [uml-devel] uml-patch-2.4.24-3]

[Joe Marzot <gmarzot@nortelnetworks.com>]

A little more data on this one - the behaviour I see with these mounts 
is that

mount -t hostfs none /mnt/mybob -o /view/myview/vob/myvob

succeeds but mounts the hosts / dir instead of the desired view extended 
pathname of the ClearCase vob.

very strange - 2.4.24-1 patch seems to work fine with these Clearcase 
host filesystems.

I tries with 2.4.24-3 but did not even get it too boot but this is 
likely some other issue.

regards, GSM

Joe Marzot wrote:
> Jeff Dike wrote:
> 
>> gmarzot@nortelnetworks.com said:
>>
>>> I wonder based on what you say here if two UMLs that hostfs mount the
>>> same directory and access the same file...one for reading, and the
>>> other  for writing, if the first will see the updates written by the
>>> second....or maybe I am misinterpretting.
>>
>>
>>
>> You are correct, the writer will cache the new data, and the reader 
>> won't see
>> it until it's flushed out somehow.  If you can arrange to have the 
>> writer sync the filesystem before the reader reads the files, then it 
>> will get up-to-date information.
>>
>> Otherwise, if this is a problem, we need to make hostfs optionally 
>> synchronous.
> 
> 
> Yes - I think there is value in that.
> 
> On a different but related topic. I am trying the 2.4.24-2 patch to see 
> if it helps with the kernel panics I posted about in a previous thread 
> but I am now seeing some odd failures with hostfs. Granted my seetup is 
> a bit odd (i.e., atypical).
> 
> I am mounting Clearcase vobs using view extended pathnames. I have a 
> little script that mounts a whole series of Clearcase vobs...after the 
> script some are mounted and some are not...Clearcase implements these 
> view extended pathnames as a virtual filsystem (mvfs) and there must be 
> something about that which makes the mounting fail 
> occasionally...mouinting other host filesystems works as before. note: 
> mounting the CC mvfs vobs worked in 2.4.24-1 with no problem.
> 
> I will try again with 2.4.24-3 (w/ fsync - hopefully I can find the 
> right place(s)) and report on that...
> 
> regards, GSM
> 
>>
>>                 Jeff
>>
>>
> 
> 
> 





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