On 2013.10.07 at 12:12 -0500, Eric Sandeen wrote:
> On 10/7/13 11:52 AM, Markus Trippelsdorf wrote:
> > On 2013.10.07 at 10:54 -0500, Eric Sandeen wrote:
> >> On 10/7/13 10:40 AM, Markus Trippelsdorf wrote:
> >>> On 2013.10.07 at 10:36 -0500, Eric Sandeen wrote:
> >>>> On 10/7/13 10:29 AM, Markus Trippelsdorf wrote:
> >>>>> 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>
> >>>>
> >>>> Funky.
> >>>>
> >>>> How about an xfs_repair -v (for verbose).
> >>> ...
> >>> - zero log..
> >>> zero_log: head block 53048 tail block 49064
> >>> ERROR: The filesystem has valuable metadata changes in a log which needs to
> >>> ...
> >>>
> >>
> >> Very strange. Both xfs_logprint & xfs_repair should be using the same
> >> function in libxfs for finding the head & tail.
> >>
> >> I asked off-list if you wanted to provide a metadump image I could look
> >> at directly...
> >
> > I've bisected this issue to the following commit from Dave:
> >
> > commit e0607266f23f82226f8aee502552d6ce25c4e6a5
> > Author: Dave Chinner <dchinner@xxxxxxxxxx>
> > Date: Fri Jun 7 10:25:47 2013 +1000
> >
> > xfsprogs: add crc format support to repair
> >
> >
>
> Cool, thanks.
>
> That commit added:
>
> diff --git a/repair/phase2.c b/repair/phase2.c
> index 2817fed..a62854e 100644
> --- a/repair/phase2.c
> +++ b/repair/phase2.c
> @@ -64,6 +64,7 @@ zero_log(xfs_mount_t *mp)
> ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
> }
> log.l_sectbb_mask = (1 << log.l_sectbb_log) - 1;
> + log.l_sectBBsize = 1 << mp->m_sb.sb_logsectlog;
>
> if ((error = xlog_find_tail(&log, &head_blk, &tail_blk))) {
> do_warn(_("zero_log: cannot find log head/tail "
>
> right before the call to xlog_find_tail, which is what found the dirty log.
>
> those various things are:
>
> __uint8_t sb_logsectlog; /* log2 of the log sector size */
> uint l_sectbb_log; /* log2 of sector size in bbs */
> int l_sectBBsize; /* size of log sector in 512 byte chunks */
>
> The hunk above sticks out as odd, because it was already set a different way about
> 12 lines prior:
>
> log.l_sectBBsize = BTOBB(x.lbsize);
>
> And "indeed" as Dave might say, ;) - l_sectBBsize is supposed to be in
> 512-byte units (i.e. 1 for 512, 8 for 4k), but it's coming out as 4096
> because it's taking sb_logsectlog - describing byte units - and using it to get
> something in sector units.
>
> It still accidentally works for 512-byte sectors, because in in that case we set
> sb_logsectlog to 0 (not 9, because - sure, why not!):
>
> if (lsectorsize != BBSIZE || sectorsize != BBSIZE) {
> sbp->sb_logsectlog = (__uint8_t)lsectorlog;
> sbp->sb_logsectsize = (__uint16_t)lsectorsize;
> } else {
> sbp->sb_logsectlog = 0;
> sbp->sb_logsectsize = 0;
> }
>
>
>
> Anyway:
>
> I bet if you remove "log.l_sectBBsize = 1 << mp->m_sb.sb_logsectlog;" from
> around line 67 it'll fix it.
>
> Want to try it? Sorry for abusing your bandwidth in the meantime. :)
> If it works I'll send the patch.
Yes, commenting out that line fixes the issue.
--
Markus
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