On Mon, May 21, 2018 at 04:27:00PM -0700, Darrick J. Wong wrote: > Something doesn't smell right here. The only pages we need to read in > are the first and last pages in the write_begin range, and only if they > aren't page aligned and the underlying extent is IOMAP_MAPPED, right? Yes, and I'm pretty sure I did get this right before refactoring everything for sub-blocksize support.
