On Mon 28-05-12 17:05:11, Ted Tso wrote: > On Mon, May 28, 2012 at 02:29:05PM -0600, Andreas Dilger wrote: > > This patch is good from the POV of covering all filesystems, and > > avoiding the deadlock at the dcache level. It would be possible to > > detect this problem in the filesystem itself during lookup, before > > the bad link got into the dcache itself. Something like: > > I like that as a solution for detecting the problem in ext4. As you > say, it's still an issue for other file systems, and so the patch I > proposed is still probably a good idea for the VFS. But this way ext4 > (and ext3 when Jan backports it) will be able to detect the problem > and mark the file system as being corrupted. Actually, I think there's even better way. d_splice_alias() can rather easily detect the problem and report it to filesystem. The advantage is that the check in d_splice_alias() can catch any "hardlinks" to directories, not just self loops. The patch is attached, I also have corresponding handling written for ext? filesystems but that's trivial. I'll post the whole series to Al to have a look. Honza -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
