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

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

[Jeff Dike]

This patch contains a ton of hostfs/humfs work.  

The kernel infrastructure that was in hostfs_kern.c was made asynchronous, 
cleaned up, and many bugs fixed.  It was also renamed to externfs.  The old
hostfs_user.c is now host_fs.c.  Previously, there were a number of bugs
conspiring to make hostfs completely synchronous, so you could read a file
in, change it from the host, read it again, and see the new contents.  This
is now very likely not to work.  If you depend on it, yell, and I'll see how
to get it back.  O_SYNC will make writes synchronous, and O_DIRECT (when this
stuff makes it into my 2.6 tree) should do the same for writes, if it can
be invoked from mount for an entire filesystem.

humfs is now able to accept plug-in metadata modules, thanks to Piotr Neuman.
The existing shadow filesystem metadata is now plugged in to this interface, 
and lives in meta_fs.c.  This will enable all the other metadata backends
that people suggested earlier to be plugged in.  Piotr is currently working
on a tdb backend.

There was also a cleanup patch from Paul Wagland.

Everything in arch/um/fs/hostfs is now kernel code, and the USER_* stuff
in the Makefile is now gone.

As for everything else, there were
	a fix from Oleg which causes malloc to call vmalloc, which I changed
to check the allocation size and only use vmalloc for large allocations
	a fix for a bug in mconsole_interrupt which would crash if it ever saw 
an empty to-do list which cleaned up the code
	a ethernet ioctl patch from Gerd Knorr
	clean-up of the AIO support, which should now build and run on 2.4,
falling back to the IO thread if 2.6 AIO support isn't available
	a filehandle abstraction to support reclaiming file descriptors
when we hit the kernel limit

				Jeff



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

[roland]

hi jeff, 
compiling a 2.4.26 with uml-patch-2.4.24-3 still seems to have
the __cmpxchg issue.
see:
http://article.gmane.org/gmane.linux.uml.user/3806

i attached the mentioned patch and after that,  it compiles cleanly
for me.

regards
roland



----- Original Message ----- 
From: "Jeff Dike" <jdike@addtoit.com>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Thursday, May 13, 2004 12:08 AM
Subject: [uml-devel] uml-patch-2.4.24-3


> This patch contains a ton of hostfs/humfs work.  
> 
> The kernel infrastructure that was in hostfs_kern.c was made asynchronous, 
> cleaned up, and many bugs fixed.  It was also renamed to externfs.  The old
> hostfs_user.c is now host_fs.c.  Previously, there were a number of bugs
> conspiring to make hostfs completely synchronous, so you could read a file
> in, change it from the host, read it again, and see the new contents.  This
> is now very likely not to work.  If you depend on it, yell, and I'll see how
> to get it back.  O_SYNC will make writes synchronous, and O_DIRECT (when this
> stuff makes it into my 2.6 tree) should do the same for writes, if it can
> be invoked from mount for an entire filesystem.
> 
> humfs is now able to accept plug-in metadata modules, thanks to Piotr Neuman.
> The existing shadow filesystem metadata is now plugged in to this interface, 
> and lives in meta_fs.c.  This will enable all the other metadata backends
> that people suggested earlier to be plugged in.  Piotr is currently working
> on a tdb backend.
> 
> There was also a cleanup patch from Paul Wagland.
> 
> Everything in arch/um/fs/hostfs is now kernel code, and the USER_* stuff
> in the Makefile is now gone.
> 
> As for everything else, there were
> a fix from Oleg which causes malloc to call vmalloc, which I changed
> to check the allocation size and only use vmalloc for large allocations
> a fix for a bug in mconsole_interrupt which would crash if it ever saw 
> an empty to-do list which cleaned up the code
> a ethernet ioctl patch from Gerd Knorr
> clean-up of the AIO support, which should now build and run on 2.4,
> falling back to the IO thread if 2.6 AIO support isn't available
> a filehandle abstraction to support reclaiming file descriptors
> when we hit the kernel limit
> 
> Jeff
> 
> 
> 
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> Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to 
> deliver higher performing products faster, at low TCO.
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> 


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

[Sven 'Darkman' Michels]

roland wrote:
> hi jeff, 
> compiling a 2.4.26 with uml-patch-2.4.24-3 still seems to have
> the __cmpxchg issue.
> see:
> http://article.gmane.org/gmane.linux.uml.user/3806
> 
> i attached the mentioned patch and after that,  it compiles cleanly
> for me.

Well, notice that its still UML 2.4.->24<- ;)
If the releases will be for a newer kernel, the patch will be
included.

Regards,
Sven



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

[roland]

> Well, notice that its still UML 2.4.->24<- ;)
> If the releases will be for a newer kernel, the patch will be
> included.
ok - seems you`re right :)

----- Original Message ----- 
From: "Sven 'Darkman' Michels" <sven@darkman.de>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Thursday, May 13, 2004 2:14 AM
Subject: Re: [uml-devel] uml-patch-2.4.24-3


> roland wrote:
> > hi jeff, 
> > compiling a 2.4.26 with uml-patch-2.4.24-3 still seems to have
> > the __cmpxchg issue.
> > see:
> > http://article.gmane.org/gmane.linux.uml.user/3806
> > 
> > i attached the mentioned patch and after that,  it compiles cleanly
> > for me.
> 
> Well, notice that its still UML 2.4.->24<- ;)
> If the releases will be for a newer kernel, the patch will be
> included.
> 
> Regards,
> Sven
> 
> 
> 
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Re: [uml-devel] uml-patch-2.4.24-3

[Joe Marzot]

Jeff Dike wrote:
> This patch contains a ton of hostfs/humfs work.  
> 
> The kernel infrastructure that was in hostfs_kern.c was made asynchronous, 
> cleaned up, and many bugs fixed.  It was also renamed to externfs.  The old
> hostfs_user.c is now host_fs.c.  Previously, there were a number of bugs
> conspiring to make hostfs completely synchronous, so you could read a file
> in, change it from the host, read it again, and see the new contents.  This
> is now very likely not to work. 

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.

??

thanks, Giovanni






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

[Jeff Dike]

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.

				Jeff



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

[Joe Marzot]

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

[Joe Marzot]

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

[Henrik Nordstrom]

On Mon, 17 May 2004, Joe Marzot wrote:

> 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.

This is a known bug in 2.4.24-2. A patch can be found in the archives or 
from http://marasystems.com/download/uml/

If you need hostfs then you should probably stick to 2.4.24-1 for the time
being. Jeff is doing some heavy restructuring of the uml host file access
methods while adding the humfs and as a result of this the hostfs support
has become very unstable while the combined supporting framework for humfs
and hostfs is taking shape. Hopefully this will soon result in a much 
better hostfs than before, but at the moment things is a bit shaky..

Regards
Henrik



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[uml-devel] how to do programming in UML

[pronoy debnath]

[-- Attachment #1: Type: text/plain, Size: 1632 bytes --]


Hi,
    The root_fs, I am using for uml, does not contain gcc.
   
     Is it possible to compile a program using host machine's gcc and 
libraries?
     If yes, how can I do it?

Thanks,
Pronoy


Henrik Nordstrom wrote:

>On Mon, 17 May 2004, Joe Marzot wrote:
>
>  
>
>>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.
>>    
>>
>
>This is a known bug in 2.4.24-2. A patch can be found in the archives or 
>from http://marasystems.com/download/uml/
>
>If you need hostfs then you should probably stick to 2.4.24-1 for the time
>being. Jeff is doing some heavy restructuring of the uml host file access
>methods while adding the humfs and as a result of this the hostfs support
>has become very unstable while the combined supporting framework for humfs
>and hostfs is taking shape. Hopefully this will soon result in a much 
>better hostfs than before, but at the moment things is a bit shaky..
>
>Regards
>Henrik
>
>
>
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>  
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[-- Attachment #2: Type: text/html, Size: 2556 bytes --]

Re: [uml-devel] how to do programming in UML

[roland]

[-- Attachment #1: Type: text/plain, Size: 2645 bytes --]

hi!
>    The root_fs, I am using for uml, does not contain gcc.
you can install gcc inside your uml!

>Is it possible to compile a program using host machine's gcc and libraries?
you mean, you want to use the host machinse gcc and libraries inside uml? (by hosfs mount or whatever?)
no - i wouldn`t recommend that.
you can compile your stuff outside your uml on the host itself and transfer the binaries to the uml afterwards - you just need to make sure that your host and your uml(root_fs) OS-version don`t differ too much - otherwise you will get problems with library dependency (that`s just the same issue as if you compile on a redhat 9 and transfer the binaries to a suse 6.4 :)

>If yes, how can I do it?
just as usual?
configurer
make
make install.....

regards
roland


  ----- Original Message ----- 
  From: pronoy debnath 
  Cc: user-mode-linux-devel@lists.sourceforge.net 
  Sent: Tuesday, May 18, 2004 6:54 AM
  Subject: [uml-devel] how to do programming in UML



  Hi,
      The root_fs, I am using for uml, does not contain gcc.
      
       Is it possible to compile a program using host machine's gcc and libraries?
       If yes, how can I do it?

  Thanks,
  Pronoy


  Henrik Nordstrom wrote:

On Mon, 17 May 2004, Joe Marzot wrote:

  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.
    
This is a known bug in 2.4.24-2. A patch can be found in the archives or 
from http://marasystems.com/download/uml/

If you need hostfs then you should probably stick to 2.4.24-1 for the time
being. Jeff is doing some heavy restructuring of the uml host file access
methods while adding the humfs and as a result of this the hostfs support
has become very unstable while the combined supporting framework for humfs
and hostfs is taking shape. Hopefully this will soon result in a much 
better hostfs than before, but at the moment things is a bit shaky..

Regards
Henrik



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[-- Attachment #2: Type: text/html, Size: 4990 bytes --]

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

[Joe Marzot]

Thank you so much for the reply - For the most part existing hostfs 
support has been fine for me (I need the sync behaviour).

However with 2.4.24-1 I am still getting kernel panic crashes and it 
looked like some crashes were handled in 2.4.24-2. I will try to pick 
through the 2.4.24-2 patch and take just the not hostfs parts.

I do have loads of cores if anyone is interested since I hacked the 
panic code to abort() as I was not catching these intermittent crashes 
very often.

regards, Giovanni

Henrik Nordstrom wrote:
> On Mon, 17 May 2004, Joe Marzot wrote:
> 
> 
>>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.
> 
> 
> This is a known bug in 2.4.24-2. A patch can be found in the archives or 
> from http://marasystems.com/download/uml/
> 
> If you need hostfs then you should probably stick to 2.4.24-1 for the time
> being. Jeff is doing some heavy restructuring of the uml host file access
> methods while adding the humfs and as a result of this the hostfs support
> has become very unstable while the combined supporting framework for humfs
> and hostfs is taking shape. Hopefully this will soon result in a much 
> better hostfs than before, but at the moment things is a bit shaky..
> 
> Regards
> Henrik
> 
> 





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

[Henrik Nordstrom]

On Tue, 18 May 2004, Joe Marzot wrote:

> Thank you so much for the reply - For the most part existing hostfs 
> support has been fine for me (I need the sync behaviour).
> 
> However with 2.4.24-1 I am still getting kernel panic crashes and it 
> looked like some crashes were handled in 2.4.24-2. I will try to pick 
> through the 2.4.24-2 patch and take just the not hostfs parts.

Pathes making hostfs usable in both 2.4.24-2 and 2.4.26-1 is available 
from http://marasystems.com/download/

> I do have loads of cores if anyone is interested since I hacked the 
> panic code to abort() as I was not catching these intermittent crashes 
> very often.

stack traces of the panics is more interesting (extract from the core
using gdb and the exact binary the core was generated from)..  even more
so if you find a common pattern and have some suspicion on how/when it may
occur.

Regards
Henrik



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

[Jeff Dike]

On Tue, May 18, 2004 at 11:43:02AM -0400, Joe Marzot wrote:
> Thank you so much for the reply - For the most part existing hostfs 
> support has been fine for me (I need the sync behaviour).

Enough people do that I will add a synchronous option which restores the
old behavior.

> I do have loads of cores if anyone is interested since I hacked the 
> panic code to abort() as I was not catching these intermittent crashes 
> very often.

For starters, backtraces would be good.

				Jeff


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