CD writing in ext2 filesystem

CD writing in ext2 filesystem

[Suriya Narayanan M S]

Hi all,
	I wrote a CD in ext2 filesystem (that is what I 
thought I did) but now I am unable to read the CD.
What I did was
$ dd if=/dev/zero of=file.ext2 bs=400M count=1
$ mkfs.ext2 file.ext2
# mount file.ext2 /mnt/fileimage -t ext2 -o loop
# cp something /mnt/fileimage
# umount /mnt/fileimage
# cdrecord -v speed=4 dev=0,0,0 -data file.ext2

I was unabe to mount the CD with the command
# mount -t ext2 -o ro /dev/cdrom /mnt/cdrom 

Some observations I made were
$ file file.ext2
file.ext2: Linux rev 1.0 ext2 filesystem data
$ cat /dev/cdrom | file -
standard input:              Linux rev 1.0 ext2 filesystem data
$ dd if=/dev/cdrom of=newfile.ext2
Now I am able to mount newfile.ext2

Could somebody please help me on what could have gone wrong.

Thanks in advance
Suriya Narayanan M S
-- 
Guru Brahma Gurur Vishnu
Gurur Dhevo Maheshwaraha
Gurur Saakshaath Parabramha
Thasmai Shree Gurave Namaha


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Re: CD writing in ext2 filesystem

[Pierre Rousselet]

Suriya Narayanan M S wrote:
> # mount -t ext2 -o ro /dev/cdrom /mnt/cdrom 

Is there any error message following this command line ?


Pierre
------------------------------------------------
  Pierre Rousselet <pierre.rousselet@wanadoo.fr>
------------------------------------------------

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Re: CD writing in ext2 filesystem

[Suriya Narayanan M S]

On Monday 22 April 2002 01:29, Pierre Rousselet wrote:
  > Suriya Narayanan M S wrote:
  > > # mount -t ext2 -o ro /dev/cdrom /mnt/cdrom
  >
  > Is there any error message following this command line ?
Yes.
mount: wrong fs type, bad option, bad superblock on /dev/cdrom, 
       or too many mounted file systems
--
Guru Brahma Gurur Vishnu
Gurur Dhevo Maheshwaraha
Gurur Saakshaath Parabramha
Thasmai Shree Gurave Namaha

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Re: CD writing in ext2 filesystem

[Pierre Rousselet]

Suriya Narayanan M S (by way of Suriya Narayanan M S ) wrote:
> On Monday 22 April 2002 01:29, Pierre Rousselet wrote:
>   > Suriya Narayanan M S wrote:
>   > > # mount -t ext2 -o ro /dev/cdrom /mnt/cdrom
>   >
>   > Is there any error message following this command line ?
> Yes.
> mount: wrong fs type, bad option, bad superblock on /dev/cdrom, 
>        or too many mounted file systems

What is the block size of the ext2 fs in the image.ext2 file ?
# dumpe2fs /dev/cdrom | grep size

Problems were reported in the past while trying to mount ext2 fs with bs 
1024 on an ide-scsi driven device knowing only bs 4096.
You may try to unload ide-scsi and to mount the cdrom as /dev/hdxx, or 
create an ext2 image with bs=4096 before writing it onto the cd.


Pierre
------------------------------------------------
  Pierre Rousselet <pierre.rousselet@wanadoo.fr>
------------------------------------------------

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Re: CD writing in ext2 filesystem

[Staci]

--- Suriya Narayanan M S <mssnlayam@cs.annauniv.edu>
wrote:
> On Monday 22 April 2002 01:29, Pierre Rousselet
> wrote:
>   > Suriya Narayanan M S wrote:
>   > > # mount -t ext2 -o ro /dev/cdrom /mnt/cdrom
>   >
>   > Is there any error message following this
> command line ?
> Yes.
> mount: wrong fs type, bad option, bad superblock on
> /dev/cdrom, 
>        or too many mounted file systems

Umm..I just joined, so maybe I missed something in
this.
But since when are cdroms ext2???
They're usually iso9660.

What is this you are trying to mount?

sl

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Re: CD writing in ext2 filesystem

[Paul Furness]

Hmm. Well, when CDs are created, the file system used is called iso9660.
What I _think_ has happened is that you have created a file on your hard
disk inside which you have created an ext2 filesystem, but then then you
recorded that file onto a CD. As far as I know, cdrecord will try and
interpreate the file you give it as either a CD image file (ie an
iso9660 file system) or a ufs file system. What it MAY have done is
created an iso9660 image on the CD and copied your file containing the
ext2 onto the CD as a file. In other words, to get at it you need to
mount the CD (as iso9660) and then mount the file inside the CD file
system.

Try using mount without the -t option - it should recognise the file
system on the CD (if it is a working one) and mount it automatically.
you could then ls /mnt/cdrom and see if the file file.ext2 comes up.

Is there a particular reason why you were trying to put an ext2 fiole
system on the CD rather than an ISO9660 one?

Incidentally, if you just want to copy some stuff to a CD, the easiest
way is to use one of the nice graphical CD writing tools that are around
- try xcdroast, for example.

Hope that some of this helps...

Paul.


On Tue, 2002-04-23 at 18:48, Suriya Narayanan M S wrote:
> On Monday 22 April 2002 01:29, Pierre Rousselet wrote:
>   > Suriya Narayanan M S wrote:
>   > > # mount -t ext2 -o ro /dev/cdrom /mnt/cdrom
>   >
>   > Is there any error message following this command line ?
> Yes.
> mount: wrong fs type, bad option, bad superblock on /dev/cdrom, 
>        or too many mounted file systems
> --
> Guru Brahma Gurur Vishnu
> Gurur Dhevo Maheshwaraha
> Gurur Saakshaath Parabramha
> Thasmai Shree Gurave Namaha
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
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> Please read the FAQ at http://www.linux-learn.org/faqs
> 

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Re: CD writing in ext2 filesystem

[Richard Adams]

On Wednesday 24 April 2002 09:45, Paul Furness wrote:
> Hmm. Well, when CDs are created, the file system used is called iso9660.
> What I _think_ has happened is that you have created a file on your hard
> disk inside which you have created an ext2 filesystem, but then then you
> recorded that file onto a CD. As far as I know, cdrecord will try and
> interpreate the file you give it as either a CD image file (ie an
> iso9660 file system) or a ufs file system. What it MAY have done is
> created an iso9660 image on the CD and copied your file containing the
> ext2 onto the CD as a file. In other words, to get at it you need to
> mount the CD (as iso9660) and then mount the file inside the CD file
> system.
>
> Try using mount without the -t option - it should recognise the file
> system on the CD (if it is a working one) and mount it automatically.
> you could then ls /mnt/cdrom and see if the file file.ext2 comes up.
>
> Is there a particular reason why you were trying to put an ext2 fiole
> system on the CD rather than an ISO9660 one?
>
> Incidentally, if you just want to copy some stuff to a CD, the easiest
> way is to use one of the nice graphical CD writing tools that are around
> - try xcdroast, for example.

If it is of any interest i do this all the time for backups, the cdrom needs 
to be mounted with iso9660 then one has an image on the cd of ones harddisk.

ls -al /cdrom would then show up like a normall linux distribution tree.



>
> Hope that some of this helps...
>
> Paul.
>
> On Tue, 2002-04-23 at 18:48, Suriya Narayanan M S wrote:
> > On Monday 22 April 2002 01:29, Pierre Rousselet wrote:
> >   > Suriya Narayanan M S wrote:
> >   > > # mount -t ext2 -o ro /dev/cdrom /mnt/cdrom
> >   >
> >   > Is there any error message following this command line ?
> >
> > Yes.
> > mount: wrong fs type, bad option, bad superblock on /dev/cdrom,
> >        or too many mounted file systems
> > --
> > Guru Brahma Gurur Vishnu
> > Gurur Dhevo Maheshwaraha
> > Gurur Saakshaath Parabramha
> > Thasmai Shree Gurave Namaha
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-newbie"
> > in the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.linux-learn.org/faqs
>
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-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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CD writing in ext2 filesystem

[Suriya Narayanan M S]

Hi,
	Thank you very much for help. Now I am able to write
CDs in native ext2 format. This is very useful since there is
no need to bother about long filenames, maximum depth, etc.
I would like to summarize how to do it. This is for the benefit
of others who are new to the list or have lost track of this
discussion.
	The point to note is the block size has to be 4k.

	Create a file of the required size
$ dd if=/dev/zero of=file.ext2 bs=650M count=1
	Create an ext2 filesystem in it. Block size 4096 is important
$ mkfs.ext2 file.ext2 -b 4096
$ mkdir mountdir
# mount file.ext2 mountdir -o loop
# cp something mountdir
# umount mountdir
	Write the CD
# cdrecord dev=0,0,0 speed=4 -data file.ext2
	Now mount the CD and use it
# mount /dev/cdrom mountdir -t ext2 -o ro

Thank you,
Suriya Narayanan M S
-- 
Guru Brahma Gurur Vishnu
Gurur Dhevo Maheshwaraha
Gurur Saakshaath Parabramha
Thasmai Shree Gurave Namaha

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Re: CD writing in ext2 filesystem

[Richard Adams]

On Thursday 25 April 2002 01:24, Suriya Narayanan M S wrote:
> Hi,
> 	Thank you very much for help. Now I am able to write
> CDs in native ext2 format. This is very useful since there is
> no need to bother about long filenames, maximum depth, etc.
> I would like to summarize how to do it. This is for the benefit
> of others who are new to the list or have lost track of this
> discussion.

I cant imagen why you think you need to use what you have explained, the 
first thing is that if other's try your way then they will possably have the 
same problem i did with 'dd', with such a large file 650M dd will say;
dd: memory exhausted or at least it does here.
I have 256M and 300M swap, i dont know why it says that and to be honest i 
dont care. What i am going to explain is another way to do what you want but 
in my opinion "much easyer" and "cleaner".

Use a front end like xcdroast, configure xcdroast's H/D settings to the 
directory with all your files you want to burn.
Save setup and go to main screen.
Click "master tracks" and choose what you want to burn. You can now choose 
iso9660 options or leave them "as is" click on "Create session/image" click 
"calculate size", then click either "master to image" or "on the fly" thats 
it.

No need to create any files no need to "battle" with dd telling you that your 
memory is exhausted and no need to clean up afterwards and forall no need to 
have "extra" disk space to create such a large file on, (which really you 
dont need).

You will get long file names exachtly as you see it on your hard drive.
In my opinion that is one hell of a lot easier than your way.

No disrepects but why drive 1000 miles to go from a to b when the distance 
between the two is only 200 miles.


> 	The point to note is the block size has to be 4k.
>
> 	Create a file of the required size
> $ dd if=/dev/zero of=file.ext2 bs=650M count=1
> 	Create an ext2 filesystem in it. Block size 4096 is important
> $ mkfs.ext2 file.ext2 -b 4096
> $ mkdir mountdir
> # mount file.ext2 mountdir -o loop
> # cp something mountdir
> # umount mountdir
> 	Write the CD
> # cdrecord dev=0,0,0 speed=4 -data file.ext2
> 	Now mount the CD and use it
> # mount /dev/cdrom mountdir -t ext2 -o ro
>
> Thank you,
> Suriya Narayanan M S

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: CD writing in ext2 filesystem

[Suriya Narayanan M S]

On Wednesday 24 April 2002 15:15, Paul Furness wrote:
  > Is there a particular reason why you were trying to put an ext2 fiole
  > system on the CD rather than an ISO9660 one?

Yes. One would like to have all the filesystems to be of the same
type. It would be easier to handle and there would be no
inconsistencies. It (the one you use regularly) is the best filesystem
to backup data.

But the main advantage (of using ext2) is that you get a
filesystem which is the same as your native system. Permissions,
ownership, symlinks, pipes, device files..... (all the great features
of ext2) get taken care of. Most of the above would
not be possible with iso9660. The Rockridge extensions handle them
well. However it too has a problem with the maximum depth
of a directory tree.

If you do not need your CD to be accessed on other OSs
then ext2 is the best bet.

Bye,
Suriya Narayanan M S
-- 
Guru Brahma Gurur Vishnu
Gurur Dhevo Maheshwaraha
Gurur Saakshaath Parabramha
Thasmai Shree Gurave Namaha


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Re: CD writing in ext2 filesystem

[Richard Adams]

On Thursday 25 April 2002 17:00, Suriya Narayanan M S wrote:
> On Wednesday 24 April 2002 15:15, Paul Furness wrote:
>   > Is there a particular reason why you were trying to put an ext2 fiole
>   > system on the CD rather than an ISO9660 one?
>
> Yes. One would like to have all the filesystems to be of the same
> type. It would be easier to handle and there would be no
> inconsistencies. It (the one you use regularly) is the best filesystem
> to backup data.
>
> But the main advantage (of using ext2) is that you get a
> filesystem which is the same as your native system. Permissions,
> ownership, symlinks, pipes, device files..... (all the great features
> of ext2) get taken care of. Most of the above would
> not be possible with iso9660. The Rockridge extensions handle them
> well. However it too has a problem with the maximum depth
> of a directory tree.

UUM, excuse me for only thinking, but, if one creates a tarball and then 
burns it to a cd, one then has the same, or am i missing something here.?????

How do you think a linux distribution comes on a cdrom.????
Its iso9660 of course, but when its copied onto a H/D it has permissions of 
its piers.

I do not see your point of view here, if i am missing something please tell 
me, i am at a loss as to what in the world it could be.

>
> If you do not need your CD to be accessed on other OSs
> then ext2 is the best bet.
>
> Bye,
> Suriya Narayanan M S

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: CD writing in ext2 filesystem

[Pierre Rousselet]

Richard Adams wrote:
 > UUM, excuse me for only thinking, but, if one creates a tarball and then
 > burns it to a cd, one then has the same, or am i missing something 
here.?????
 >
 > How do you think a linux distribution comes on a cdrom.????
 > Its iso9660 of course, but when its copied onto a H/D it has 
permissions of
 > its piers.
 >
 > I do not see your point of view here, if i am missing something 
please tell
 > me, i am at a loss as to what in the world it could be.

troll v.,n. To utter a posting designed to attract predictable
responses or flames. Derives from the phrase "trolling for newbies";
which in turn comes from mainstream "trolling";, a style of fishing in
which one trails bait through a likely spot hoping for a bite.


Pierre
--
------------------------------------------------
   Pierre Rousselet <pierre.rousselet@wanadoo.fr>
------------------------------------------------


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Re: CD writing in ext2 filesystem

[Steven Smith]

[-- Attachment #1: Type: text/plain, Size: 1439 bytes --]

> >   > Is there a particular reason why you were trying to put an ext2 fiole
> >   > system on the CD rather than an ISO9660 one?
...
> > But the main advantage (of using ext2) is that you get a
> > filesystem which is the same as your native system. Permissions,
> > ownership, symlinks, pipes, device files..... (all the great features
> > of ext2) get taken care of. Most of the above would
> > not be possible with iso9660. The Rockridge extensions handle them
> > well. However it too has a problem with the maximum depth
> > of a directory tree.
> UUM, excuse me for only thinking, but, if one creates a tarball and then 
> burns it to a cd, one then has the same, or am i missing something here.?????
You'll get everything he listed, but ext2 has a few exotic features that
tar doesn't:

1) ACLs and EAs (if you have the patches from acl.bestbits.at)
2) HURD translator and author data
3) Sparse files
4) The noatime, sync, append only, compressed, nodump, immutable, journaled,
secure delete, and undeletable attributes.

Very few of these are generally useful, and numbers 1 and 4 need unusual
patches to use fully, but they are there for a reason, and most tars
don't support them. Plus, in the future, we're likely to get multiple
file forks, which really will need backing up.

Burning an ext2 image onto a CD is a strange thing to do, but not without
its merit.

Steven Smith,
sos22@cam.ac.uk.

[-- Attachment #2: Type: application/pgp-signature, Size: 232 bytes --]

Re: CD writing in ext2 filesystem

[Richard Adams]

On Thursday 25 April 2002 18:49, Pierre Rousselet wrote:

> troll v.,n. To utter a posting designed to attract predictable
> responses or flames. Derives from the phrase "trolling for newbies";
> which in turn comes from mainstream "trolling";, a style of fishing in
> which one trails bait through a likely spot hoping for a bite.

You are possably correct, however.

Just imagen all the ones that have tryed out the idea's written about ext2 
filesystems on a cdrom.....
What do you think they have thought so far.?

Its feasable what the person suggest's, but it has, AFAIsee no use at all.

I remember last year when someone sent a small one line script to the list 
asking what was wrong with it and if folks would test/try it, well i am sure 
many did, but i am also sure that many lost there systems as well as it would 
have completely wiped out there disk, (if run as root), if it was run as a 
user then that user lost all data/files in his home directory, i take that 
sort of thing very seriously indeed when sent to a list of people who have 
trust in us who try to answer questions sensibly and to the best of our 
knowlage.

Joking and palying around should be done in the playground, not in the 
classroom.

One reason why i bite at the bate...
If you belive i am a troll for doing so let me know.

>
>
> Pierre
> --
> ------------------------------------------------
>    Pierre Rousselet <pierre.rousselet@wanadoo.fr>
> ------------------------------------------------

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: CD writing in ext2 filesystem

[Richard Adams]

On Thursday 25 April 2002 19:12, Steven Smith wrote:

> Burning an ext2 image onto a CD is a strange thing to do, but not without
> its merit.

As this is a newbie list and most folks will not even see the point of any 
further disscussion on this matter i will rest my case.

>
> Steven Smith,
> sos22@cam.ac.uk.

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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