On Mon, Jun 12, 2017 at 08:23:10AM -0400, Jeff Layton wrote:

For now, only do this when the FS_WB_ERRSEQ flag is set. The
AS_EIO/AS_ENOSPC flags are not currently cleared in the older code when
writeback initiation fails, only when we discover an error after waiting
on writeback to complete, so we only want to do this with errseq_t based
error handling to prevent seeing duplicate errors on fsync.

Please make sure this doens't stay conditional by the end of the series.
We only have three file systems using dax, and a series should be able
to make them agree on a single interface.