After trying to unmount a NFS filesystem (flags rw,hard,intr,nfsvers=3rw,hard,intr,nfsvers=3) on which I have opened files, umount -f says "umount2: Device or resource busy". Mount does not show the filesystem as mounted, though I can do different operations on it as if it is mounted. Closing the opened files does not really unmount it either. Executing umount -f again after closing all files really unmounts the filesystem. Reproducible: Always Steps to Reproduce: 1. mount NFS filesystem 2. open some files (e.g. play some music) 3. umount -f the filesystem Actual Results: mount does not show the filesystem as mounted, though it appears to still be mounted Linux t61 2.6.25-gentoo-r7 #9 SMP Sun Oct 26 12:34:35 CET 2008 x86_64 Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz GenuineIntel GNU/Linux
Looks like a nice feature to me. Could you rephrase this into a real problem (describe why you must really unmount it right there and then, and how apparently umount implies -l (lazy unmount)? Please post your `emerge --info' too.
Either that or mark this bug as a duplicate of bug #244976. :)
Bug #244976 involves suspend, so I consider it a different case (umount is not invoked rendering the filesystem broken). From the man page: -f Force unmount (in case of an unreachable NFS system). (Requires kernel 2.1.116 or later.) -l Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore. (Requires kernel 2.4.11 or later.) it doesn't say that -f implies -l and if I close all opened files, the filesystem is not unmounted as -l should imply (though I did not invoke umount with -l). This is a problem, since if I invoke umount I expect it to unmount the filesystem and mount shows it as not mounted. So mount is lies! And the filesystem is not unmounted when I close all references so I am left with mounted filesystem that I am not aware of, and this is a problem to me :). I consider a problem everyting that does not work as it is supposed to. So a possible solution is to fix mount so that it shows the apparently mounted filesystem or fix umount, so that it really unmounts it (moreover I used -f). When I close the water tap, I suppose water stops, I should not continue flowing :) if if does I will flood my appartment, which is a problem. I use nfs-utils 1.1.0-r1 emerge --info: Portage 2.1.4.5 (default/linux/amd64/2008.0/desktop, gcc-4.1.2, glibc-2.6.1-r0, 2.6.25-gentoo-r7 x86_64) ================================================================= System uname: 2.6.25-gentoo-r7 x86_64 Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz Timestamp of tree: Wed, 22 Oct 2008 23:00:01 +0000 app-shells/bash: 3.2_p33 dev-java/java-config: 1.3.7, 2.1.6 dev-lang/python: 2.5.2-r7 dev-python/pycrypto: 2.0.1-r6 dev-util/cmake: 2.4.8 sys-apps/baselayout: 1.12.11.1 sys-apps/sandbox: 1.2.18.1-r2 sys-devel/autoconf: 2.13, 2.61-r2 sys-devel/automake: 1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1 sys-devel/binutils: 2.18-r3 sys-devel/gcc-config: 1.4.0-r4 sys-devel/libtool: 1.5.26 virtual/os-headers: 2.6.23-r3 ACCEPT_KEYWORDS="amd64" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=nocona -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/config /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/php/apache2-php5/ext-active/ /etc/php/cgi-php5/ext-active/ /etc/php/cli-php5/ext-active/ /etc/splash /etc/terminfo /etc/texmf/web2c /etc/udev/rules.d" CXXFLAGS="-march=nocona -O2 -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="distlocks metadata-transfer sandbox sfperms strict unmerge-orphans userfetch" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo" LANG="bg_BG.UTF-8" LC_ALL="bg_BG.UTF-8" LDFLAGS="-Wl,-O1" LINGUAS="bg en en_US" MAKEOPTS="-j4" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY=" " SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="3dnow X Xaw3d aac acl acpi aim alsa amd64 apm arts berkdb bluetooth branding bzip2 cairo calendar cddb cdr cli cracklib crypt ctype cups curl curlwrappers d dbus dga directfb djvu dri dvd dvdr dvdread eds emboss encode esd evo exif expat fam fbcon ffmpeg firefox flac fontconfig fortran gd gdbm gif gimp gnome gnome-keyring gnuplot gnutls gpm gstreamer gtk gtk2 hal iconv icq imagemagick imap ipod isdnlog jabber jack java jpeg jpeg2k kde kerberos lame latex ldap libffi libnotify lirc lm_sensors lzo mad mailwrapper midi mikmod mime mmx mozilla mp3 mpeg mplayer msn mudflap multilib multislot mysql nas ncurses nls nptl nptlonly objc objc++ objc-gc ogg opengl openmp pam pcmcia pcre pdf perl png ppds pppd python qt3 qt3support qt4 quicktime rdesktop readline reflection samba sdl session sockets sox spell spl sqlite sse sse2 ssl startup-notification subversion svg sysfs tcpd tiff tk truetype unicode usb v4l v4l2 vnc vorbis wifi xine xinerama xml xmlrpc xorg xv yahoo zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" ELIBC="glibc" INPUT_DEVICES="edev keyboard mouse synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="bg en en_US" USERLAND="GNU" VIDEO_CARDS="nv nvidia vesa" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS Thanks
Sorry for the grammar mistakes, I edit a lot in this textbox. A preferred solution for me would be, that umount really unmounts the filesystem. Now as I read the man page carefully, it says (for -l) "Detach the filesystem from the filesystem hierarchy now", which does not happen, since I am able to browse the filesystem, so it is not detached! And still I didn't invoke "-l". I consider it a BUG, not a feature. Hope this is enough rephrasing.
