lkml.org 
[lkml]   [2001]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectOK to mount multiple FS in one dir?
I was groping around my FAT/NTFS directories from Linux, mounting and 
unmounting them into
/mnt, and was suprised at some point that I got the message "/dev/sda5
already mounted or
/mnt busy". (I'm using a SCSI disk, use hda* for IDE).

Upon further examination, I found that I'd accidentally mounted
/dev/sda1 (VFAT) on /mnt
while /dev/sda5 (NTFS) was still mounted there. The NTFS files remained
invisible until
I'd unmounted /dev/sda1 and then I could see them again.

This is with the 2.4.1 kernel on a Pentium III machine with an Adaptec
29160 SCSI
controller.

I found I could mount three partitions on /mnt, and they'd all show up
as mounted at
/mnt in the "mount" command, but if I unmounted one of them (only tried
with the currently
visible one), then it appeared that there were no filesystems mounted
there, but I could
continue umounting until the other two were gone.

I'm suprised this works. Note that the kernel rejected an attempt to
mount a filesystem
that was already mounted, but not to mount a filesystem at a point that
was already in use.
It looks like there is a stack of mounts on the mount point.

Looking at Documentation/Changes, I see that I need util-linux 2.10o. I
had 2.10l. But I
had the 2.10r util-linux sources on my machine and installed mount and
umount from it, and
I find that it gets it right mostly when I mount and unmount multiple
things, with the
exception that if /dev/sda5 was mounted before /dev/sda1, then if I give
the command
"umount /dev/sda5", sda1 is the one that gets unmounted rather than
sda5, so it takes the
most recently mounted filesystem rather than the one you specify.

Michael D. Crawford
GoingWare Inc. - Expert Software Development and Consulting
http://www.goingware.com/
crawford@goingware.com

Tilting at Windmills for a Better Tomorrow.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:55    [W:0.066 / U:0.444 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site