Debian bug report logs - #860
`only root can mount' can mean `already mounted'

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Date: Sat, 6 May 95 00:45 BST
From: iwj10@cus.cam.ac.uk (Ian Jackson)
To: Debian bugs submission address <debian-bugs@pixar.com>
Subject: `only root can mount' can mean `already mounted'

Package: mount
Version: 2.2-1

`mount' sometimes issues the message `only root can mount X on Y' when
trying the mount as root correctly gives `x already mounted or y
busy'.

See the transcript below.

chiark:~> mount /floppy/
mount: only root can mount /dev/fd0 on /floppy
chiark:~> really mount /floppy/
mount: /dev/fd0 already mounted or /floppy busy
chiark:~> mount 
/dev/sdb1 on / type ext2 (rw)
/dev/sdb2 on /usr type ext2 (rw)
/dev/sda8 on /var type ext2 (rw)
/proc on /proc type proc (rw)
/dev/sdb4 on /u type ext2 (rw)
/dev/sdb5 on /u/tmp type ext2 (rw)
/dev/sdb7 on /var/spool/news type ext2 (rw)
/dev/sda4 on /u/ian/doom type msdos (rw,umask=007,uid=100,gid=100)
/dev/sda7 on /u/ian/other type msdos (rw,umask=007,uid=100,gid=100)
/dev/sda1 on /old type ext2 (rw)
/dev/sda5 on /old/usr type ext2 (rw)
/dev/sda2 on /usr/local/src/old type ext2 (rw)
/dev/fd0 on /floppy type msdos (rw,noexec,nosuid,nodev,umask=007,uid=100,gid=100)
chiark:~> id
uid=100(ian) gid=100(ian) groups=100(ian),0(root),6(disk),8(mail),9(news),20(dialout),25(floppy),35(dos),40(src),50(staff),60(users),200(ian-p),201(ian-m),1000(ijackson)
chiark:~> really id
uid=0(root) gid=0(root) groups=100(ian),0(root),6(disk),8(mail),9(news),20(dialout),25(floppy),35(dos),40(src),50(staff),60(users),200(ian-p),201(ian-m),1000(ijackson)
chiark:~> ll -d /dev/fd0 /floppy 
brw-rw----   1 root     floppy     2,   0 Mar 30 21:18 /dev/fd0
drwxrwx---   2 ian      ian          7168 May  6 00:40 /floppy/
chiark:~> cat /etc/fstab
/dev/sdb1       /                       ext2    defaults        0 1
/dev/sdb2       /usr                    ext2    defaults        0 2
/dev/sda8       /var                    ext2    defaults        0 2
/dev/sdb6       none                    swap    sw
proc            /proc                   proc    defaults

/dev/fd0        /floppy         msdos   noauto,user,umask=007,uid=100,gid=100
/dev/scd0       /cdrom          iso9660 noauto,user,ro

/dev/sdb4       /u                      ext2    defaults        0 2
/dev/sdb5       /u/tmp                  ext2    defaults        0 2
/dev/sdb7       /var/spool/news         ext2    defaults        0 2
/dev/sda4       /u/ian/doom             msdos   umask=007,uid=100,gid=100
/dev/sda7       /u/ian/other            msdos   umask=007,uid=100,gid=100

/dev/sda6       none                    ignore

/dev/sda1       /old                    ext2    default         0 2
/dev/sda5       /old/usr                ext2    defaults        0 2
/dev/sda2       /usr/local/src/old      ext2    defaults        0 2
chiark:~> 

Ian.