Re: [uml-devel] uml-patch-2.4.24-3

[Joe Marzot <gmarzot@nortelnetworks.com>]

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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