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Bug 155950 - mkfs.vat on an LVM volume fails with a drive geometry error
Summary: mkfs.vat on an LVM volume fails with a drive geometry error
Alias: None
Product: Fedora
Classification: Fedora
Component: dosfstools
Version: rawhide
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Peter Vrabec
QA Contact: Ben Levenson
Depends On:
TreeView+ depends on / blocked
Reported: 2005-04-26 00:51 UTC by Ziga Mahkovec
Modified: 2007-11-30 22:11 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2005-04-28 14:30:35 UTC

Attachments (Terms of Use)
Patch that fixes the HDIO_GETGEO problem in mkdosfs (deleted)
2005-04-28 12:48 UTC, Ziga Mahkovec
no flags Details | Diff

Description Ziga Mahkovec 2005-04-26 00:51:05 UTC
Description of problem:
When running some file system tests, I noticed that I cannot create a vfat file
system over LVM.  It fails with an "unable to get drive geometry" error.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
This is easy to reproduce using loopback devices (but note that it also fails
for block devices):

# dd if=/dev/zero of=/tmp/img.file bs=1M count=128
# losetup /dev/loop0 /tmp/img.file
# pvcreate /dev/loop0
  Physical volume "/dev/loop0" successfully created
# vgcreate testvg /dev/loop0
  Volume group "testvg" successfully created
# lvcreate -L 100M -n testlv testvg
  Logical volume "testlv" created
# mkfs.vfat /dev/testvg/testlv
mkfs.vfat 2.10 (22 Sep 2003)
mkfs.vfat: unable to get drive geometry for '/dev/testvg/testlv'

Actual results:
The above "unable to get drive geometry" error is shown and no file system is

Expected results:
The file system should be created.

Additional info:
I don't expect this to be a common usage scenario, so I'm setting the severity
to low.

Comment 1 Ziga Mahkovec 2005-04-28 12:48:11 UTC
Created attachment 113770 [details]
Patch that fixes the HDIO_GETGEO problem in mkdosfs

The problem here is that mkdosfs calls the HDIO_GETGEO ioctl, which fails on an
LVM device (ENOTTY - Inappropriate ioctl for device).  Upstream dosfstools-2.11
fixes this by using some default geometry values instead.  I'm attaching a
similar patch for 2.10.

Comment 2 Peter Vrabec 2005-04-28 14:30:35 UTC
thx a lot.

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