On Fri, Aug 31, 2018 at 11:55:54AM -0300, Ernesto A. Fernández wrote: > On Thu, Aug 30, 2018 at 10:36:42PM -0700, Christoph Hellwig wrote: > > On Fri, Aug 31, 2018 at 12:58:19AM -0300, Ernesto A. Fernández wrote: > > > Creating, renaming or deleting a file may cause catalog corruption and > > > data loss. This bug is randomly triggered by xfstests generic/027, but > > > here is a faster reproducer: > > > > > > truncate -s 50M fs.iso > > > mkfs.hfsplus fs.iso > > > mount fs.iso /mnt > > > i=100 > > > while [ $i -le 150 ]; do > > > touch /mnt/$i &>/dev/null > > > ((++i)) > > > done > > > i=100 > > > while [ $i -le 150 ]; do > > > mv /mnt/$i /mnt/$(perl -e "print $i x82") &>/dev/null > > > ((++i)) > > > done > > > umount /mnt > > > fsck.hfsplus -n fs.iso > > > > It would be good to wire up this short reproducer as well for xfstests. > > Yes, that's my intention. The problem is that mkfs.hfsplus does not allow > setting the size of the filesystem for scratch_mkfs_sized(); you need a > workaround with the device mapper. I think I should submit that patch first > and see if there is a problem with it. You don't need to do that. We use loop devices like this w/ mkfs_dev quite a lot in fstests. For example, generic/361 has pretty much the exact code pattern you need.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx
