On Mon, Nov 26, 2012 at 02:43:40PM +0100, Lukáš Czerner wrote:
> > The I checked the script common.rc, and found that it uses
> > df to determine the filesystem type and it uses the realpath
> > "/dev/dm-0" instead of "/dev/mapper/mpatha", while df always
> > shows "devtmpfs" instead of "ext4" for /dev/dm-0.
> >
> > I run "mount" and found that devtmpfs is mount on /dev/ on opensuse
> > ***by default***. Even though I run "mount -t btrfs /dev/dm-0 /somedir",
> > df still showed devtmpfs.
> >
> > Any ideas to kick off the xfstests?
At least with the df which ships with Debian Testing, df will display
the file system in use if it matches the device name which is
/etc/mtab. It looks the issue is that mount is canonicalizing the
device name to be the human friendly version:
# ls -l /dev/mapper/closure-bigscratch
0 lrwxrwxrwx 1 root root 7 Nov 16 15:15 /dev/mapper/closure-bigscratch -> ../dm-7
<tytso.root@closure> {/home/tytso/bin}, level 2
# mount /dev/dm-7 /u2
# df /u2
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/closure-bigscratch 52403200 224772 52178428 1% /u2
# grep /u2 /etc/mtab
/dev/mapper/closure-bigscratch /u2 xfs rw,relatime,attr2,inode64,noquota 0 0
So the simplest solution is to just use /dev/mapper/mpatha instead of
insisting on using /dev/dm-0. That's what I do....
- Ted
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