Workaroundable bug with 2.6.0-test3 xfs & xfs_growfs

[Erkki Seppala <flux-xfs@inside.org>]

Growing filesystem twice after mount fails. Reproducing:

1) mount /dev/store/media2 - 100G volume
2) lvextend -L 200G /dev/store/media2
3) xfs_growfs -d /dev/store/media2
  -> works ok
4) lvextend -L 350G /dev/store/media2
5) xfs_growfs -d /dev/store/media2
  -> says there is nothing to be done

Unmounting and mounting the system will allow xfs_growfs to work
again.

This is the output I'm getting (a bit fake, taken after the incident,
the size was reported properly):

meta-data=/mnt/media2            isize=256    agcount=88, agsize=1048576 blks
         =                       sectsz=512  
data     =                       bsize=4096   blocks=91750400, imaxpct=25
         =                       sunit=0      swidth=0 blks, unwritten=1
naming   =version 2              bsize=4096  
log      =internal               bsize=4096   blocks=12800, version=1
         =                       sectsz=512   sunit=0 blks
realtime =none                   extsz=65536  blocks=0, rtextents=0
data size unchanged, skipping

I have xfsprogs 2.5.4-1 from Debian unstable.
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