On Fri, 2007-07-06 at 12:03 +0200, Bernd Schubert wrote:
> I just got this in dmesg:
>
> [67100.343686] Lustre: Found inode with zero generation or link -- this may
> indicate disk corruption (inode: 26398122/151277060, link 0, count 1)
> [67100.358660] Lustre: Found inode with zero generation or link -- this may
> indicate disk corruption (inode: 26398122/151277060, link 0, count 1)
> [67100.368242] Lustre: Found inode with zero generation or link -- this may
> indicate disk corruption (inode: 26398122/151277060, link 0, count 1)
> [67100.368248] Lustre: Skipped 6 previous similar messages
> [67100.386517] Lustre: Found inode with zero generation or link -- this may
> indicate disk corruption (inode: 26398114/151277054, link 0, count 1)
>
> So I did run an e2fsck again and among the orphaned inodes e2fsck found in
> the
> journal were also these above.
>
> This might or might not be a bug in our additional patches for 2.6.20, but
> its
> hard to test, since I have not access to your cvs tree for lustre-1.6.1 with
> 2.6.18 support and older kernels won't run on our hardware.
>
> Let me know if there's anything I can do to debug this.
Hi Bernd,
This happens because it is actually possible to get a zero generation inode
once every (random < 2^32) inodes.
Ldiskfs needs to have this patch to skip inodes with generation = 0.
linux-2.6.9-34.orig/fs/ext3/ialloc.c 2007-01-03 13:30:33.000000000 +0000
+++ linux-2.6.9-34/fs/ext3/ialloc.c 2007-01-03 13:42:04.000000000 +0000
@@ -721,6 +721,8 @@ got:
insert_inode_hash(inode);
spin_lock(&sbi->s_next_gen_lock);
inode->i_generation = sbi->s_next_generation++;
+ if (unlikely(inode->i_generation == 0))
+ inode->i_generation = sbi->s_next_generation++;
spin_unlock(&sbi->s_next_gen_lock);
ei->i_state = EXT3_STATE_NEW;
There also needs to be a change in mds_fid2dentry(). These patches can be found
in bz10419.
Thanks,
Kalpak.
>
> Cheers,
> Bernd
>
>
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