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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1185521
Title:
Mounting as minix can block a long time
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
I'm using Ubuntu 13.10 dev with mount 2.20.1-5.1ubuntu8. Forcing to
use minix as filesystem on mounting a device which has another
filesystem and doing another disk operation on the physical device
will cause mount to block until the disk operation is finished. Here
is an example:
1. As preparation clean the cache with "echo 3 > /proc/sys/vm/drop_caches".
2. Execute "mount -t minix -v /dev/sda5 /mnt & find / > /dev/null" (dev/sda5
is a swap partition and / is /dev/sda1 (ext4)).
Because /dev/sda5 is a swap partition theoretically the mount
operation should fail in a short time. But mount waits until the find
command has finsihed which can need a long time. After this the
following error is shown (as expected):
root@ubuntu:~# mount: wrong fs type, bad option, bad superblock on /dev/sda5,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
Replacing minix with ext4 on mounting works fine. The mounting operation will
fail too but this needs less than a seconds instead of a few minutes. It is
even conspicuous that without another disk operation mounting as minix needs a
few times longer than other filesystems. I'm assuming there is something broken
on the minix module with checking for bad filesystems.
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