-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 01/11/2013 06:52 PM, Mike Frysinger wrote: > On Thursday 03 May 2012 10:29:07 Phillip Susi wrote: >> If you want to hide mounts from certain processes, that is what >> unshare is for. Hiding a mount from all processes does not make >> sense. If you know a mount is gone and beyond recovery ( like in >> this loop over nfs case, or removed media ), then it should be >> forcibly unmounted, not simply made invisible and doomed to >> remain a zombie mount until the system is rebooted. > > in an ideal world, maybe unshare might work. in the real world, it > doesn't. you can use it only on *new* processes, not ones that are > already running. nor can you do `unshare shutdown` and have it work > since that simply signals a long running init process to initiate a > shutdown. > > an nfs server goes afk and attempts to `umount` it timeout, as well > as many desktop programs (like kde io daemons that like to walk > available mount points) or shutdown processes. no call to > `unshare` will fix this, but certainly forcibly removing it with > `umount -l` will. -mike A bit of a delayed response there, but my point was that what you are looking for is umount -f, not umount -l. It also used to be that once you detached a mount with umount -l, you could not reattach it. Attempts to remount would fail with EBUSY and so this was a horribly broken state to be in. At some point it seems this was changed and now you *can* reattach, so lazy unmount is no longer pure evil, but still it is no forced unmount. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iQEcBAEBAgAGBQJQ8LQ4AAoJEJrBOlT6nu75BO0H/A1mZ3qYAfSe/H8Z4x3BVsOZ /sKYxc6JWUVrK5xfycZlZzpkRsIHL0Jj+asYe/+OAUHHmaUKooR7HuGF90U4kitN h+UEdyNJJkgldju2rwePyIGucit/HOxz/SfWtSALUiu7w9OIpmkqcCXIINLJvQ0R nQHLm79d5YFWXQRgKRuloDIW6+kBSq0cpZ+63CFhz2G7CuqzZaa1rE+I1TZbcOzF p7G8dM/3//BeMZw/yFFDu1Ia2snO3o3vdrZWIZlbVu7fnDXC+a/qfcZtGRNZVZP9 iD4fpPNsKrjLGuaCormk62lm1OBT5YyolKaZPSJWDJrpkwKotndcwVrXWYsKGqY= =i+ji -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
