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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