xfs_repair refuses to run on cleanly mountable partition

[Markus Trippelsdorf]

On 2013.10.07 at 10:21 -0500, Eric Sandeen wrote:
> On 10/7/13 10:16 AM, Markus Trippelsdorf wrote:
> > x4 ~ # xfs_repair -V
> > xfs_repair version 3.2.0-alpha1
> > 
> > x4 ~ # mount -o logbsize=256k /dev/sdc1 /mnt
> > ...
> > [ 6419.592649] XFS (sdc1): Mounting Filesystem
> > [ 6419.642480] XFS (sdc1): Ending clean mount
> > 
> > x4 ~ # xfs_info /dev/sdc1
> > meta-data=/dev/sdc1              isize=256    agcount=4, agsize=61047552 blks
> >          =                       sectsz=4096  attr=2, projid32bit=0
> >          =                       crc=0
> > data     =                       bsize=4096   blocks=244190208, imaxpct=25
> >          =                       sunit=0      swidth=0 blks
> > naming   =version 2              bsize=4096   ascii-ci=0
> > log      =internal               bsize=4096   blocks=119233, version=2
> >          =                       sectsz=4096  sunit=1 blks, lazy-count=1
> > realtime =none                   extsz=4096   blocks=0, rtextents=0
> > 
> > x4 ~ # umount /mnt
> > 
> > x4 ~ # xfs_repair /dev/sdc1
> > Phase 1 - find and verify superblock...
> > Phase 2 - using internal log
> >         - zero log...
> > ERROR: The filesystem has valuable metadata changes in a log which needs to
> > be replayed.  Mount the filesystem to replay the log, and unmount it before
> > re-running xfs_repair.  If you are unable to mount the filesystem, then use
> > the -L option to destroy the log and attempt a repair.
> > Note that destroying the log may cause corruption -- please attempt a mount
> > of the filesystem before doing this.
> 
> What kernel are you running?  Does older xfs_repair behave differently?
> (use xfs_repair -n if you test an old xfsprogs, to preserve this state
> for debugging...)

I'm running the latest git kernel 3.12.0-rc4. 
"xfs_repair -n" runs fine even with xfsprogs 3.2.0-alpha1...

> Perhaps copying out or dumping the log w/ xfs_logprint would also help, 
> maybe start with:
> 
> # xfs_logprint -t /dev/sdc1
xfs_logprint:
    data device: 0x821
    log device: 0x821 daddr: 976760888 length: 953864

    log tail: 53376 head: 53376 state: <CLEAN>


-- 
Markus