On Thu, Apr 19, 2018 at 01:47:49AM +0000, Trond Myklebust wrote: > If the main use case is something like Postgresql, where you care about > just one or two critical files, rather than monitoring the entire > filesystem could we perhaps use a dedicated mmap() mode? It should be > possible to throw up a bitmap that displays the exact blocks or pages > that are affected, once the file has been damaged. Perhaps we need to have a quick summary of the postgres problem ... they're not concerned with "one or two files", otherwise they could just keep those files open and the wb_err mechanism would work fine. The problem is that they have too many files to keep open in their checkpointer process, and when they come along and open the files, they don't see the error..
