Hi Grant ! >How are you going to prevent a race condition? > > 1) you check to see if the filesystem is in use and find that it > isn't. > > 2) another process opens/creates a file in the filesystem. > > 3) you do your cleanup. > > 4) you do a umount and it fails.
You are absolutely right. This race condition has to be prevented. I considered a separate lock for this, as I'm able to control the initial access to the filesystem (login) but can't control/lock what may be forked off from there. ... but Laurent's mount --bind / umount sequence shall prevent (or at least catch) that race condition. So I'm going to use fuser to do a quick check to avoid unnecessary mount/umount calls and then catch a failing umount and skip the cleanup (leaving filesystem in operational state). -- Harald _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
