Date: Fri, 12 Nov 2004 08:32:13 -0800 From: Jay O'Brien <jayobrien@att.net> To: FreeBSD - questions <questions@freebsd.org> Subject: Re: mount hides underlying files Message-ID: <4194E58D.8060407@att.net> In-Reply-To: <20041112082812.Q66644@frambozen.monochrome.org> References: <419449CF.5050509@att.net> <20041112082812.Q66644@frambozen.monochrome.org>
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Chris Hill wrote: > On Thu, 11 Nov 2004, Jay O'Brien wrote: > > >>If I mkdir /test and then place files in /test, those files >>are no longer visible when I use /test as a mount point. The >>files become visible again when I unmount the device. >> >>I have read documentation explaining this phenomenon, and I >>would like to review that documentation again. Is it in the >>handbook? > > > Yes. There is a discussion of this at > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/disk-organization.html > > Also see the following page. > Chris, Thank you, that answers the basic question, with the word "replaces". That is, when a filesystem is "mounted" to a directory, it "replaces" what was there, it doesn't add to it. This is different from my experience with other operating systems, and was confusing to me. I do remember seeing a more verbose description, however, that discusses what happens to the underlying files when something is mounted over the top of their directory; I also vaguely remember something suggesting that this is a way to "hide" files from the casual observer, revealing the files by unmounting the file system that caused them to be hidden. I don't have a reason to hide files; I remember reading the discussions, and would like to read them again. Jay O'Brien
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