On Tue, May 07, 2019 at 11:20:57AM -0400, Dan Ritter wrote: > Martin McCormick wrote: > > I may just be remembering things the wrong way [...] [about not immediatlely "seeing" the results of a mount on the CWD] [...] > mkdir point > cd point > touch original > ls [practical demonstration illustrating that] > This behavior has always been consistent in Linux, as far as I am aware. > > The handle to your current directory cannot be changed out from > underneath you; only when you move away from it can it be > released, and from then on you see the new mount. Makes sense: the current shell (and that is from where we're looking at things) keeps the current working directory, CWD, open. This inode doesn't go away after a mount -- thus as long as the shell doesn't close it (by, e.g., changing to another directory), it will keep "seeing" that directory, even if a new process doing an open() will "see" the result after the mount. You can achieve similarly funny results by removing a file (or directory) while it's kept open by a process. Cheers -- tomás
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