Re: different log info for mkfs.xfs and xfs_growfs

[Wengang Wang <wen.gang.wang@oracle.com>]

On 10-04-17 22:13, Eric Sandeen wrote:
> Wengang Wang wrote:
> > Hi experts,
> > 
> > I just noticed that the log info is different for mkfs.xfs and
> > xfs_growfs.
> > 
> > [root@desk test-xfsprogs]# mkfs.xfs -llogdev=/dev/sda11,size=32768b
> > /dev/sda10 -f
> > meta-data=/dev/sda10             isize=256    agcount=4, agsize=1250558
> > blks
> >          =                       sectsz=512   attr=2
> > data     =                       bsize=4096   blocks=5002231, imaxpct=25
> >          =                       sunit=0      swidth=0 blks
> > naming   =version 2              bsize=4096   ascii-ci=0
> > log      =/dev/sda11             bsize=4096   blocks=32768, version=2
> >          =                       sectsz=512   sunit=0 blks, lazy-count=0
> > realtime =none                   extsz=4096   blocks=0, rtextents=0
> > [root@desk test-xfsprogs]# mount -ologdev=/dev/sda11 /dev/sda10 /xfs
> > [root@desk test-xfsprogs]# xfs_growfs -n /xfs 
> > meta-data=/dev/sda10             isize=256    agcount=4, agsize=1250558
> > blks
> >          =                       sectsz=512   attr=2
> > data     =                       bsize=4096   blocks=5002231, imaxpct=25
> >          =                       sunit=0      swidth=0 blks
> > naming   =version 2              bsize=4096   ascii-ci=0
> > log      =external               bsize=4096   blocks=32768, version=2
> >          =                       sectsz=512   sunit=0 blks, lazy-count=0
> > realtime =none                   extsz=4096   blocks=0, rtextents=0
> > 
> > So xfs_growfs is simply reporting external.
> 
> The devicename isn't stored in the superblock, so growfs can't get it via
> the XFS_IOC_FSGEOMETRY ioctl.
> 
> > Why there is such a difference? And how get to know the log device name after it
> > is mounted?
> 
> /etc/mtab? :)
> 
> The UUID of the filesystem can be found in the log device after mkfs, but
> xfs is also perfectly happy with a completely zeroed-out log device (after
> a clean unmount).
 
Ok. I got.
> > It's 3.0.0 of xfsprogs. I failed to test with upstream because of the
> > comlilation error:
> > [wwg@desk xfsprogs.git]$ make
> > Building include
> > Building libxfs
> >     [DEP]
> > /usr/bin/makedepend: warning:  ignoring option -Wall
> > /usr/bin/makedepend: error:  cannot open "no-strict-aliasing"
> >     [LD]     libxfs.la
> > libtool: link: only absolute run-paths are allowed
> > gmake[2]: *** [libxfs.la] Error 1
> > gmake[1]: *** [libxfs] Error 2
> > make: *** [default] Error 2
> 
> I think I saw this once but it went away; does a make realclean
> fix it up for you - or was this a pristine git tree?

Yes, realclean works. 

Thanks for the explanations!

regards,
wengang.

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