From: bugzilla-daemon@bugzilla.kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 111801] New: mount fails silently if mount point is "busy"
Date: Wed, 03 Feb 2016 14:53:26 +0000 [thread overview]
Message-ID: <bug-111801-13602@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=111801
Bug ID: 111801
Summary: mount fails silently if mount point is "busy"
Product: File System
Version: 2.5
Kernel Version: all, back to 2.6.11, at least, including the latest
raspbian, Ubuntu 14.04.3.LTS, as well as Fedora Cor 16
and even SuSE 9.3 (kernel 2.6..11, c. 2006)
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@kernel-bugs.osdl.org
Reporter: diemkae@gmail.com
Regression: No
Attempt to mount a extX, vfat, CIFS, etc. filesystem to a mount point that is
"busy" fails silently but appears to "work" in that "df" indicates the
filesystem is mounted to that mount point (per /etc/fstab), and it appears to
be normal in /etc/mtab, yet the partition files do not appear in the mount
point directory and if were are any files in the (root FS) mount point
directory, they are still accessible)!
As illustrated in the example below, the failed mount can be remedied by
umounting the partition, cd'ing to $HOME (to make the mount point not busy),
then remounting the partition, the mount point then contains the files from the
partition.
Example: illustrates (under Raspbian, on a Raspbery Pi) how to reproduce a
silent failure when vfat partition mounted to a busy mount point (made only
busy because shell CWD is the mount point directory):
Script started on Wed 03 Feb 2016 07:41:27 AM EST
root@raspi2:/# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 15186900 6421400 8098164 45% /
devtmpfs 469752 0 469752 0% /dev
tmpfs 94816 404 94412 1% /run
tmpfs 5120 0 5120 0% /run/lock
tmpfs 189620 0 189620 0% /run/shm
//nas2/export.dmk 961301000 338699164 573747452 38% /media/nas1.dmk
/dev/mmcblk0p1 57288 20304 36984 36% /boot
root@raspi2:/# ls /boot
bcm2708-rpi-b.dtb config.txt issue.txt overlays
bcm2708-rpi-b-plus.dtb COPYING.linux kernel7.img start_cd.elf
bcm2708-rpi-cm.dtb fixup_cd.dat kernel.img start_db.elf
bcm2709-rpi-2-b.dtb fixup.dat LICENCE.broadcom start.elf
bootcode.bin fixup_db.dat LICENSE.oracle start_x.elf
cmdline.txt fixup_x.dat origCmdline.txt whereAmI
root@raspi2:/# more /boot/whereAmI
this is on the SD card.
root@raspi2:/#
root@raspi2:/# umount /boot
root@raspi2:/# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 15186900 6421400 8098164 45% /
devtmpfs 469752 0 469752 0% /dev
tmpfs 94816 404 94412 1% /run
tmpfs 5120 0 5120 0% /run/lock
tmpfs 189620 0 189620 0% /run/shm
//nas2/export.dmk 961301000 338699164 573747452 38% /media/nas1.dmk
root@raspi2:/# ls /boot
whereAmI
root@raspi2:/# more /boot/whereAmI
this is in the root fs /boot directory
root@raspi2:/# mount /boot
root@raspi2:/# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 15186900 6421400 8098164 45% /
devtmpfs 469752 0 469752 0% /dev
tmpfs 94816 404 94412 1% /run
tmpfs 5120 0 5120 0% /run/lock
tmpfs 189620 0 189620 0% /run/shm
//nas2/export.dmk 961301000 338699164 573747452 38% /media/nas1.dmk
/dev/mmcblk0p1 57288 20304 36984 36% /boot
root@raspi2:/# ls /boot
bcm2708-rpi-b.dtb config.txt issue.txt overlays
bcm2708-rpi-b-plus.dtb COPYING.linux kernel7.img start_cd.elf
bcm2708-rpi-cm.dtb fixup_cd.dat kernel.img start_db.elf
bcm2709-rpi-2-b.dtb fixup.dat LICENCE.broadcom start.elf
bootcode.bin fixup_db.dat LICENSE.oracle start_x.elf
cmdline.txt fixup_x.dat origCmdline.txt whereAmI
root@raspi2:/# more /boot/whereAmI
this is on the SD card.
root@raspi2:/#
Script done on Wed 03 Feb 2016 07:42:34 AM EST
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next reply other threads:[~2016-02-03 14:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 14:53 bugzilla-daemon [this message]
2016-02-03 15:15 ` [Bug 111801] mount fails silently if mount point is "busy" bugzilla-daemon
2016-02-03 15:27 ` bugzilla-daemon
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