Hi, I wrote a test tool that exercises page faults on hole-y portions of an mmapped file. The file is created, sized using various methods, mmapped, and then two threads race to write a marker to different offsets within each mapped page. Once the threads have finished marking each page, the pages are checked for the presence of the markers. The test easily exposes corruption on pmem-backed, DAX-mounted xfs and ext4 file systems. With 4.3 and this patch set, the data corruption is no longer seen. The test code was posted to linux-ext4: http://marc.info/?l=linux-ext4&m=144683276225574&w=2 For the series: Tested-by: Brian Boylston <brian.boylston@xxxxxxx> -----Original Message----- From: Dave Chinner [mailto:david@xxxxxxxxxxxxx] Sent: Sunday, October 18, 2015 11:27 PM Subject: [PATCH 0/6 V2] xfs: upfront block zeroing for DAX Hi folks, This is an updated patch set that was first posted here: http://oss.sgi.com/archives/xfs/2015-10/msg00006.html I've dropped the DAX locking revert patch from it; that's on it's way to Linus via other channels and is essentially independent to this set of XFS changes. The only real change in the XFS code between the two versions is the addition of XFS_TRANS_RESERVE in the DAX path in xfs_iomap_write_direct() to allow it to dip into the reserve block pool for unwritten extent conversion rather than reporting ENOSPC. Patches are against 4.3-rc5 + XFS for-next branch. -Dave. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
