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Date:      Fri, 24 Apr 2015 13:12:19 -0600
From:      Gary Aitken <ah@dreamchaser.org>
To:        FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject:   /cd0 held open but no files reported
Message-ID:  <553A9593.30500@dreamchaser.org>

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I have a situation I'd like some insights on...

running 9.2 release on an AMD 64, X with xfce4

I mounted a CD from root:
  #mount -t cd9660 /dev/cd0 /cd0
Accessed some files on the CD using gimp.
Exited gimp

When I try to umount, I get the message:
  #umount /cd0
  umount: unmount of /cd0 failed: Device busy 

However:
  #lsof /cd0
shows nothing

but:
  fuser /cd0
  /cd0: 2029

>From lsof:
gvfsd-tra  2029      garya  cwd     VDIR              0,121                512        2 /
gvfsd-tra  2029      garya  rtd     VDIR              0,121                512        2 /
gvfsd-tra  2029      garya  txt     VREG              0,129              45792  4220202 /usr/local/libexec/gvfsd-trash
gvfsd-tra  2029      garya  txt     VREG              0,121             105608    66081 /libexec/ld-elf.so.1
gvfsd-tra  2029      garya  txt     VREG              0,129             147752  1993838 /usr/local/lib/gvfs/libgvfsdaemon.so
gvfsd-tra  2029      garya  txt     VREG              0,129             247312  1993832 /usr/local/lib/gvfs/libgvfscommon.so
gvfsd-tra  2029      garya  txt     VREG              0,129              11832  1472099 /usr/local/lib/libgmodule-2.0.so.0.4200.1
gvfsd-tra  2029      garya  txt     VREG              0,129            1448336  1472091 /usr/local/lib/libgio-2.0.so.0.4200.1
gvfsd-tra  2029      garya  txt     VREG              0,129             308128  1472103 /usr/local/lib/libgobject-2.0.so.0.4200.1
gvfsd-tra  2029      garya  txt     VREG              0,129            1038952  1472095 /usr/local/lib/libglib-2.0.so.0.4200.1
gvfsd-tra  2029      garya  txt     VREG              0,129              52295  1471356 /usr/local/lib/libintl.so.8.1.3
gvfsd-tra  2029      garya  txt     VREG              0,129             334240  1468794 /usr/local/lib/libdbus-1.so.3.8.9
gvfsd-tra  2029      garya  txt     VREG              0,121              74176    99126 /lib/libutil.so.9
gvfsd-tra  2029      garya  txt     VREG              0,121             101048    99122 /lib/libthr.so.3
gvfsd-tra  2029      garya  txt     VREG              0,121            1369840    99098 /lib/libc.so.7
gvfsd-tra  2029      garya  txt     VREG              0,129            1084833  1469655 /usr/local/lib/libiconv.so.2.5.1
gvfsd-tra  2029      garya  txt     VREG              0,129             422120  1468248 /usr/local/lib/libpcre.so.1.2.3
gvfsd-tra  2029      garya  txt     VREG              0,129              28248  1471297 /usr/local/lib/libffi.so.6.0.4
gvfsd-tra  2029      garya  txt     VREG              0,121              82800    99128 /lib/libz.so.6
gvfsd-tra  2029      garya  txt     VREG              0,129             126280  2512671 /usr/local/lib/gio/modules/libgioremote-volu
me-monitor.so
gvfsd-tra  2029      garya  txt     VREG              0,129             205184  2512674 /usr/local/lib/gio/modules/libgvfsdbus.so
gvfsd-tra  2029      garya    0r    VCHR               0,19                0t0       19 /dev/null
gvfsd-tra  2029      garya    1u    VCHR               0,19                0t0       19 /dev/null
gvfsd-tra  2029      garya    2u    VCHR               0,19                0t0       19 /dev/null
gvfsd-tra  2029      garya    3u    PIPE 0xfffffe000cba2b60              16384          ->0xfffffe000cba2cb8
gvfsd-tra  2029      garya    4u    PIPE 0xfffffe000cba2cb8                  0          ->0xfffffe000cba2b60
gvfsd-tra  2029      garya    5u    unix 0xfffffe01a501a2a8                0t0          ->0xfffffe01a501a000
gvfsd-tra  2029      garya    6u    PIPE 0xfffffe01a501d5b0              16384          ->0xfffffe01a501d708
gvfsd-tra  2029      garya    7u    PIPE 0xfffffe01a501d708                  0          ->0xfffffe01a501d5b0
gvfsd-tra  2029      garya    8u  KQUEUE 0xfffffe000cc98800                             count=0, state=0x2
gvfsd-tra  2029      garya    9u    unix 0xfffffe0184aea000                0t0          ->0xfffffe0184abdd48
gvfsd-tra  2029      garya   10u    unix 0xfffffe0184abdd48                0t0          ->0xfffffe0184aea000
gvfsd-tra  2029      garya   11r    VREG              0,121               2893    34721 /etc/fstab
gvfsd-tra  2029      garya   12r    VDIR              0,171                512  8748359 /hd2/home/garya/.local/share
gvfsd-tra  2029      garya   13u    unix 0xfffffe000caec000                0t0          /tmp/gvfs-garya-7d54udcg/socket
gvfsd-tra  2029      garya   14r    VDIR              0,171                512  8748371 /hd2/home/garya/.local/share/Trash
gvfsd-tra  2029      garya   15r    VDIR              0,171              16384  8750121 /hd2/home/garya/.local/share/Trash/files
gvfsd-tra  2029      garya   16r    VDIR              0,169               2560        2 /hd2/Downloads
gvfsd-tra  2029      garya   17r    VDIR              0,169               2560        2 /hd2/Downloads
gvfsd-tra  2029      garya   18r    VDIR              0,171               1024        2 /hd2/home
gvfsd-tra  2029      garya   19r    VDIR              0,171               1024        2 /hd2/home
gvfsd-tra  2029      garya   20r    VDIR              0,173               2560        2 /hd2/home/garya/Photos
gvfsd-tra  2029      garya   21r    VDIR              0,173               2560        2 /hd2/home/garya/Photos
gvfsd-tra  2029      garya   22r                                                        unknown file system type: isofs
gvfsd-tra  2029      garya   23u    unix 0xfffffe01a5019aa0                0t0          /tmp/gvfs-garya-4y77tyna/socket
gvfsd-tra  2029      garya   24r                                                        unknown file system type: isofs

Can anyone give me a clue as to what's going on?
I thought a device was only busy if a file was open on it, 
but clearly there are other ways to tie up a device.
I presume it's tied up because gvfsd is looking for CDs being inserted,
and apparently doesn't release the device after its last use.

Just trying to understand what's going on;
I know I can force an unmount using
  umount -f /cd0

After forcing a umount, the last entry and 3rd to last entry, with no 
TYPE and DEVICE reported, are missing, so I presume those are 
associated with /dev/cd0

Thanks for any pearls of wisdom...

Gary



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