Re: Mounting IRIX filesystem with version 1 directories?

[Stephen Lord <lord@sgi.com>]

Toralf Lund wrote:

> From the XFS FAQ,
>
> Will I be able to use my old IRIX XFS disks on linux?
>
> [ ... ] Linux can only read v2 directories on the moment. Using v1 
> will probably fail in spectacular ways.
>
> I have a large IRIX filesystem that I would like to mount on Linux, 
> but I think it has version 1 directories. Is there any way at all I 
> can get this to work?
>
First of all, your Irix filesystem is going to have to meet a few other 
requirements :

  o It cannot be xlv or xvm based - there is no linux support for these
  o the filesystem blocksize needs to be the same as the page size on 
your linux block,
     the irix default is 4K, so this is usually not a problem
  o it should not have the unwritten extent support turned on.

You can check the latter 2 with xfs_growfs -n /mnt on irix

The directory code should work for the most part, but large directories 
may suffer
problems with readdir on linux - the V1 format passes up 64 bit hash 
values as
directory offsets, and this confuses glibc from time to time. Entries can go
missing or you can occassionally get into a loop.

Steve