Re: Wrong DIF guard tag on ext2 write

[Martin K. Petersen]

>>>>> "Christof" == Christof Schmitt <christof.schmitt@xxxxxxxxxx> writes:

Christof> Since the guard tags are created in Linux, it seems that the
Christof> data attached to the write request changes between the
Christof> generation in bio_integrity_generate and the call to
Christof> sd_prep_fn.

Yep, known bug.  Page writeback locking is messed up for buffer_head
users.  The extNfs folks volunteered to look into this a while back but
I don't think they have found the time yet.


Christof> Using ext3 or ext4 instead of ext2 does not show the problem.

Last I looked there were still code paths in ext3 and ext4 that
permitted pages to be changed during flight.  I guess you've just been
lucky.

-- 
Martin K. Petersen	Oracle Linux Engineering
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/