Date: Fri, 12 Nov 2004 12:04:34 -0500 (EST) From: Jerry McAllister <jerrymc@clunix.cl.msu.edu> To: jayobrien@att.net (Jay O'Brien) Cc: FreeBSD - questions <questions@freebsd.org> Subject: Re: mount hides underlying files Message-ID: <200411121704.iACH4Zq00586@clunix.cl.msu.edu> In-Reply-To: <4194E58D.8060407@att.net> from "Jay O'Brien" at Nov 12, 2004 08:32:13 AM
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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. I think that was in one of the online publications such as an OnLamp article or another of the online magazines.. But, sorry, I don't currently have a reference. ////jerry > > Jay O'Brien >
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