On Fri, Jun 23, 2017 at 02:19:31AM +0200, Andreas Gruenbacher wrote: > Both ext4 and xfs implement seeking for the next hole or piece of data > in unwritten extents by scanning the page cache, and both versions share > the same bug when iterating the buffers of a page: the start offset into > the page isn't taken into account, so when a page fits more than two > filesystem blocks, things will go wrong. For example, on a filesystem > with a block size of 1k, the following command will fail: > > xfs_io -f -c "falloc 0 4k" \ > -c "pwrite 1k 1k" \ > -c "pwrite 3k 1k" \ > -c "seek -a -r 0" foo Can you wire this up for xfstests, please?
