On Mon, May 29, 2000 at 10:10:12PM -0400, Dan Christensen wrote: > Is there an easy way to determine what makes a filesystem busy, e.g. > what prevents me from remounting /usr readonly after an upgrade? > Usually some file that was erased is being held open by a process, > but I don't know an easy way to determine which file or process. > "lsof | grep usr" is a start, but provides too long a list. Is > there an easier way?
lsof +L1 this will show you all files that are open and have a zero link count (ie deleted) what happens is this: say you have a ssh session open to somewhere, and you upgrade ssh, well /usr/bin/ssh is deleted and replaced with a new copy. but the old copy is not deleted until the ssh process you are running exits. unfortunatly the lsof trick won't always work, it seems that if you replace a library it will not show up as a open file with zero link count. i have not yet found a simple way to deal with these. sometimes i can guess and kill processes i think are using libraries i know to be upgraded... BTW you will need the lsof from potato to use the +L1 feature, it is a recent feature. -- Ethan Benson http://www.alaska.net/~erbenson/
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