When mounting btrfs-subvolumes you have to chose the subvol via mount-options "subvol" or "subvolid". The mounted subvolume should be given back when you list the mounted filesystems with plain "mount" (in other distros that works, afai googled). Reproducible: Always Steps to Reproduce: 1. mount -o subvolid=330 /dev/sdc3 /mnt/demo # mount some btrfs-subvol somewhere 2. mount | grep btrfs # check mounted btrfs-filesystems Actual Results: Mountpoints are shown, but without subvolume-infos. Expected Results: We should see which subvol/subvolid is mounted where.
always post `emerge --info $PN` when you file bugs do you have /etc/mtab as a symlink to /proc/mounts ?
# emerge --info util-linux Portage 2.2.10 (default/linux/amd64/13.0/desktop/gnome/systemd, gcc-4.8.2, glibc-2.19, 3.14.3-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-3.14.3-gentoo-x86_64-Intel-R-_Core-TM-_i7-2600_CPU_@_3.40GHz-with-gentoo-2.2 KiB Mem: 16424264 total, 7971072 free KiB Swap: 4194300 total, 4194300 free Timestamp of tree: Mon, 12 May 2014 17:00:01 +0000 ld GNU ld (GNU Binutils) 2.24 distcc 3.1 x86_64-pc-linux-gnu [disabled] ccache version 3.1.9 [disabled] app-shells/bash: 4.2_p47 dev-java/java-config: 2.2.0 dev-lang/python: 2.7.6-r1, 3.3.5, 3.4.0 dev-util/ccache: 3.1.9-r3 dev-util/cmake: 2.8.12.2-r1 dev-util/pkgconfig: 0.28-r1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.12.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.4_p6-r1, 1.7.9-r2, 1.9.6-r3, 1.10.3, 1.11.6, 1.14.1 sys-devel/binutils: 2.24-r2 sys-devel/gcc: 4.6.4, 4.8.2 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.2 sys-devel/make: 4.0-r1 sys-kernel/linux-headers: 3.14 (virtual/os-headers) sys-libs/glibc: 2.19 Repositories: gentoo ephemeral mrpdaemon flow hiro-oops-intern Installed sets: @system ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/easy-rsa /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-march=native -O2 -pipe" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--jobs=4 --load-average=1.5 --ignore-built-slot-operator-deps=y" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="de_DE.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j9" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/var/lib/layman/ephemeral /var/lib/layman/mrpdaemon /var/lib/layman/flow /usr/local/portage" SYNC="rsync://172.32.99.6/gentoo-portage" USE="X a52 aac acl alsa amd64 berkdb bitmap-fonts bluetooth branding bzip2 cairo cdda cdr cleartype cli colord cracklib crypt cups cxx dbus dri dts dvd dvdr eds emboss encode evo exif fam firefox flac fortran gdbm gif gnome gnome-keyring gnome-online-accounts gpm gstreamer gtk iconv introspection ipv6 jpeg lcms libnotify libsecret mad mmx mng modules mp3 mp4 mpeg multilib nautilus ncurses nls ogg opengl openmp pam pango pcre pdf png policykit ppds pulseaudio qt3support readline sdl session socialweb spell sse sse2 ssl startup-notification svg systemd tcpd tiff truetype truetype-fonts type1 type1-fonts udev udisks unicode upower usb vaapi vorbis wxwidgets x264 xcb xinerama xml xv xvid zlib" ABI_X86="64" 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" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd 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 cgi cgid 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" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" DRACUT_MODULES="systemd caps dm lvm mdraid" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64 pc" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="de en" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" QEMU_SOFTMMU_TARGETS="i386 x86_64" QEMU_USER_TARGETS="i386 x86_64" RUBY_TARGETS="ruby19 ruby20" SANE_BACKENDS="genesys" USERLAND="GNU" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON ================================================================= Package Settings ================================================================= sys-apps/util-linux-2.24.1-r2 was built with the following: USE="cramfs ncurses nls pam suid tty-helpers udev unicode -bash-completion -caps -cytune -fdformat -python (-selinux) -slang -static-libs -test" ABI_X86="64" PYTHON_SINGLE_TARGET="python2_7 -python3_2 -python3_3 -python3_4" PYTHON_TARGETS="python2_7 python3_3 -python3_2 -python3_4"
# ls -l /etc/mtab lrwxrwxrwx 1 root root 17 21. Aug 2011 /etc/mtab -> /proc/self/mounts System runs with systemd-212-r4 if that makes a difference ...
one month passed. let me know what else I can provide to help solving this.
really it needs someone who uses btrfs to look into it. i'd expect that the `mount` would update /run/mount/utab, but i'm not entirely sure what logic is in place to make that happen. i don't think there's a dedicated `mount.btrfs` tool which means the plain `mount` would handle it. seems to me the bug is in the kernel though. notice that while btrfs_parse_options takes care of parsing the input flags, there is no corresponding output in btrfs_show_options. https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/fs/btrfs/super.c?id=v3.15
Does that mean we should ask upstream? The btrfs-guys? thx, Stefan
(In reply to Stefan G. Weichinger from comment #6) > Does that mean we should ask upstream? The btrfs-guys? > thx, Stefan I asked on the linux-btrfs-ml and one of the devs explains the current behavior and tries to provide a solution: http://comments.gmane.org/gmane.comp.file-systems.btrfs/36715 Ubuntu does some patching somewhere ...
just checked that here, seems solved to me: $ mount | grep btrfs /dev/sda2 on / type btrfs (rw,noatime,compress=lzo,ssd,space_cache,subvolid=258,subvol=/__active/root) -> subvolid= and subvol= listed ... nice! As I opened this bug, I assume I am allowed to mark it FIXED? thanks
(In reply to Stefan G. Weichinger from comment #8) > just checked that here, seems solved to me: > > $ mount | grep btrfs > /dev/sda2 on / type btrfs > (rw,noatime,compress=lzo,ssd,space_cache,subvolid=258,subvol=/__active/root) > > -> subvolid= and subvol= listed ... nice! > > As I opened this bug, I assume I am allowed to mark it FIXED? thanks Completely forgot that I was subscribed to this..long story short: yes, this was merged into kernel 4.2. So yes, fixed. :) -h
