On Thu, Jan 12, 2012 at 02:20:49AM +0100, Jan Kara wrote: > > Hello, > > filesystem freezing is currently racy and thus we can end up with dirty data > on frozen filesystem (see changelog of the first patch for detailed race > description and proposed fix). This patch series aims at fixing this. It only fixes the dirty data race (i.e. SB_FREEZE_WRITE). The same race conditions exist for SB_FREEZE_TRANS on XFS, and so need the same fix. That race has had one previous attempt at fixing it in XFS but that's not possible: b2ce397 Revert "xfs: fix filesystsem freeze race in xfs_trans_alloc" 7a249cf xfs: fix filesystsem freeze race in xfs_trans_alloc It was looking at that problem earlier today that lead to the solution Eric proposed. Essentially the method in these patches needs to replace the xfs specifc m_active_trans counter and delay during ->fs_freeze to prevent that race condition.... Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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
