add/remove actions for usb devices

add/remove actions for usb devices

[Florian Iragne]

Hello everybody,

i've just a simple question and i didn't find any clues about the answer 
on the internet, so i ask you : why is there no "remove" action for usb 
devices with hotplug?

my current problem is that i looking for a solution to mount/umount 
usb-storage devices automagically when they are plugged/unplugged, but 
since there is no remove event, i must write a complex script to do it 
(currently working on 2.6.4-ck1 and udev).

so is this lack of "remove" event a technical limit (i now that 
usb-storage device unplugged event is seen by the scsi agent, since it 
sends a log message)?

thanks a lot for your answer

Florian

Ps: is it the right place to talk about udev? i have several questions 
about it and find no other list than this one


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Re: add/remove actions for usb devices

[Greg KH]

On Fri, Mar 26, 2004 at 08:44:56PM +0100, Florian Iragne wrote:
> Hello everybody,
> 
> i've just a simple question and i didn't find any clues about the answer 
> on the internet, so i ask you : why is there no "remove" action for usb 
> devices with hotplug?

The remove event happens just fine.  It's just that the current scripts
don't do anything with it :)

> my current problem is that i looking for a solution to mount/umount 
> usb-storage devices automagically when they are plugged/unplugged, but 
> since there is no remove event, i must write a complex script to do it 
> (currently working on 2.6.4-ck1 and udev).

But there is an event.  You can catch it on your own if you want.  Just
put your script in /etc/hotplug.d/usb/

Or if you want to catch the fact when udev removes a /dev node (which
odds are is what you really want to catch), put your script, or a link
to it in /etc/dev.d/block/ with the extension .dev and you will get both
add and remove events that corrisponded to a udev create or remove
device node.

Hope this helps,

greg k-h


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Re: add/remove actions for usb devices

[Florian Iragne]

Greg KH wrote:

>On Fri, Mar 26, 2004 at 08:44:56PM +0100, Florian Iragne wrote:
>  
>
>>Hello everybody,
>>
>>i've just a simple question and i didn't find any clues about the answer 
>>on the internet, so i ask you : why is there no "remove" action for usb 
>>devices with hotplug?
>>    
>>
>
>The remove event happens just fine.  It's just that the current scripts
>don't do anything with it :)
>
>  
>
>>my current problem is that i looking for a solution to mount/umount 
>>usb-storage devices automagically when they are plugged/unplugged, but 
>>since there is no remove event, i must write a complex script to do it 
>>(currently working on 2.6.4-ck1 and udev).
>>    
>>
>
>But there is an event.  You can catch it on your own if you want.  Just
>put your script in /etc/hotplug.d/usb/
>
>  
>
well actually, i've already try this and never catch the remove event. 
just to test i've made this single script :
if [ "$ACTION" = "add" -a "$TYPE" = "usb" ]; then
  echo "add" >> /var/log/hotplug
fi

if [ "$ACTION" = "remove" -a "$TYPE" = "usb" ]; then
    echo "remove">>/var/log/hotplug
fi

i do catch the add, but no trace of remove action in the log

>Or if you want to catch the fact when udev removes a /dev node (which
>odds are is what you really want to catch), put your script, or a link
>to it in /etc/dev.d/block/ with the extension .dev and you will get both
>add and remove events that corrisponded to a udev create or remove
>device node.
>  
>
yes, i think it's a better way, since currently i have to add a "sleep 
10" instruction to wait for udev to create th node i want to move

>Hope this helps,
>
>greg k-h
>  
>

thanks a lot, i will try this!

Florian


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Re: add/remove actions for usb devices

[Florian Iragne]

>Or if you want to catch the fact when udev removes a /dev node (which
>odds are is what you really want to catch), put your script, or a link
>to it in /etc/dev.d/block/ with the extension .dev and you will get both
>add and remove events that corrisponded to a udev create or remove
>device node.
>
>  
>
just one more stupid question! ;-)

is this /etc/dev.d/block/ directory supposed to already exist? i think 
so but can't find it. On my debian sid, i have /etc/udev directory, but 
no block in this

and another one in fact : is the creation of a SYMLINK considered as a 
node add?

many thanks

Florian


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Re: add/remove actions for usb devices

[Greg KH]

On Fri, Mar 26, 2004 at 10:22:14PM +0100, Florian Iragne wrote:
> 
> 
> >Or if you want to catch the fact when udev removes a /dev node (which
> >odds are is what you really want to catch), put your script, or a link
> >to it in /etc/dev.d/block/ with the extension .dev and you will get both
> >add and remove events that corrisponded to a udev create or remove
> >device node.
> >
> > 
> >
> just one more stupid question! ;-)
> 
> is this /etc/dev.d/block/ directory supposed to already exist? i think 
> so but can't find it. On my debian sid, i have /etc/udev directory, but 
> no block in this

You need the 023 release for this to work.

And no, that directory will not be there, you need to create it
yourself.

> and another one in fact : is the creation of a SYMLINK considered as a 
> node add?

No, but the SYMLINK had to be created to point to some real node, right?
:)

That should all happen in one action.

thanks,

greg k-h


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Re: add/remove actions for usb devices

[Florian Iragne]

Greg KH wrote:

>On Fri, Mar 26, 2004 at 10:22:14PM +0100, Florian Iragne wrote:
>  
>
>>    
>>
>>>Or if you want to catch the fact when udev removes a /dev node (which
>>>odds are is what you really want to catch), put your script, or a link
>>>to it in /etc/dev.d/block/ with the extension .dev and you will get both
>>>add and remove events that corrisponded to a udev create or remove
>>>device node.
>>>
>>>      
>>>
>>
>You need the 023 release for this to work.
>
>And no, that directory will not be there, you need to create it
>yourself.
>  
>

ok, i'm now working with the 023 release. Is there any documentation 
about this .dev script? or do you have any little example on your side?
i take a look on the net but can't find anything relevant with this feature

Florian


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Re: add/remove actions for usb devices

[Florian Iragne]

Greg KH wrote:

>On Fri, Mar 26, 2004 at 10:22:14PM +0100, Florian Iragne wrote:
>  
>
>>    
>>
>>>Or if you want to catch the fact when udev removes a /dev node (which
>>>odds are is what you really want to catch), put your script, or a link
>>>to it in /etc/dev.d/block/ with the extension .dev and you will get both
>>>add and remove events that corrisponded to a udev create or remove
>>>device node.
>>>
>>>
>>>
>>>      
>>>
>>just one more stupid question! ;-)
>>
>>is this /etc/dev.d/block/ directory supposed to already exist? i think 
>>so but can't find it. On my debian sid, i have /etc/udev directory, but 
>>no block in this
>>    
>>
>
>You need the 023 release for this to work.
>
>And no, that directory will not be there, you need to create it
>yourself.
>  
>
ok, i've played a bit with this, but can't have anything working. I've 
created /etc/dev/block directory and put a script called xdrive.dev in 
this directory.
it contains only a echo "something happens" > /var/log/udevEvent

nothing in /var/log/udevEvent

i've tried to call the script sda1.dev or anything with lower/upper 
cases, nothing worked. So, would it be possible to have a little example?

thanks

Florian


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Re: add/remove actions for usb devices

[Kay Sievers]

On Sun, Mar 28, 2004 at 03:45:48PM +0200, Florian Iragne wrote:
> ok, i've played a bit with this, but can't have anything working. I've 
> created /etc/dev/block directory and put a script called xdrive.dev in 
> this directory.
> it contains only a echo "something happens" > /var/log/udevEvent
> 
> nothing in /var/log/udevEvent
> 
> i've tried to call the script sda1.dev or anything with lower/upper 
> cases, nothing worked. So, would it be possible to have a little example?

Is it executable?
Is the first line '#!/bin/sh'?

Please build udev with 'make DEBUG=true' and have a look at the output in
syslog. You should get something like this:

  Mar 28 04:15:06 pim udev[8972]: call_foreach_file: unable to open '/etc/dev.d/net'
  Mar 28 04:15:06 pim udev[8972]: call_foreach_file: open directory '/etc/dev.d/default'
  Mar 28 04:15:06 pim udev[8972]: call_foreach_file: put file '/etc/dev.d/default/0.dev' in list
  Mar 28 04:15:06 pim udev[8972]: run_program: running /etc/dev.d/default/0.dev
  Mar 28 04:15:06 pim logger: /etc/dev.d/default/0.dev /class/net/blind0

thanks,
Kay


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Re: add/remove actions for usb devices

[Martin Lohmeier]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Sunday 28 March 2004 15:45, Florian Iragne wrote:

> ok, i've played a bit with this, but can't have anything working. I've
> created /etc/dev/block directory and put a script called xdrive.dev in
> this directory.
> it contains only a echo "something happens" > /var/log/udevEvent
>
> nothing in /var/log/udevEvent
>
> i've tried to call the script sda1.dev or anything with lower/upper
> cases, nothing worked. So, would it be possible to have a little example?

Same sittuation her for me: I need a hotplug event when I remove a usb device 
(bluetooth stick), but I don't get one.
If I add the device my Script /etc/hotplug/usb/hci_usb is executed, but not if 
I remove the stick.

BTW: is udev necessary for this? My device brought up by the bluetooth-utlis 
and I just need the event to configure the network...

by, Martin

- -- 
public key available from 
http://ferris.dyndns.info/~blackm/blackm_at_ferris.dyndns.info

Powered by Debian GNU / Linux
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Re: add/remove actions for usb devices

[jjluza]

I try to do that too.
I have a script called usbst.dev in /etc/dev.d/block
it contains :

#!/bin/bash

case $ACTION in

add)
        ls -l /dev/usbst1 >> /tmp/udeveventlog
        mount -t vfat -o sync /dev/usbst1 /mnt/usbst
        echo "mount done" >> /tmp/udeveventlog
        ls -l /dev/usbst1 >> /tmp/udeveventlog
esac


if I try to add a case "remove)", it fails on syntax error
it seems udev handles add and remove in the same case (ie "add)"), maybe it is 
what it should do, but it's not easy to manage.

More, when I plug my usb stick, /tmp/udeveventlog contains :
brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1
brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1
mount done
mount done
brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1
brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1

This behaviour seems strange for me, isn't it ?
Anyway, my usb stick is well mounted, but I get some messages in console which 
say (2 times) that my stick is already mounted (it seems that the script is 
run several times), so it's not very clean.
And I have to remove it manually for the moment.
I think an example could be a good thing too


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Re: add/remove actions for usb devices

[Kay Sievers]

On Sun, Mar 28, 2004 at 04:35:27PM +0200, jjluza wrote:
> I try to do that too.
> I have a script called usbst.dev in /etc/dev.d/block
> it contains :
> 
> #!/bin/bash
> 
> case $ACTION in
> 
> add)
>         ls -l /dev/usbst1 >> /tmp/udeveventlog
>         mount -t vfat -o sync /dev/usbst1 /mnt/usbst
>         echo "mount done" >> /tmp/udeveventlog
>         ls -l /dev/usbst1 >> /tmp/udeveventlog
> esac
> 
> 
> if I try to add a case "remove)", it fails on syntax error
> it seems udev handles add and remove in the same case (ie "add)"), maybe it is 
> what it should do, but it's not easy to manage.
> 
> More, when I plug my usb stick, /tmp/udeveventlog contains :
> brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1
> brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1
> mount done
> mount done
> brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1
> brw-------    1 root     root       8,   1 Mar 28 16:20 /dev/usbst1
> 
> This behaviour seems strange for me, isn't it ?
> Anyway, my usb stick is well mounted, but I get some messages in console which 
> say (2 times) that my stick is already mounted (it seems that the script is 
> run several times), so it's not very clean.

The script is called for every device node udev has created.
You get one event for the main device and one for the partition.
I expect, that you need to look at DEVPATH to catch the
"partition call" only.

Kay


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Re: add/remove actions for usb devices

[jjluza]

Le dimanche 28 Mars 2004 16:58, vous avez écrit :
>
> The script is called for every device node udev has created.
> You get one event for the main device and one for the partition.
> I expect, that you need to look at DEVPATH to catch the
> "partition call" only.
>
> Kay



Ok, it works with this script (with the same name and in the same place) :

> #!/bin/bash
> 
> case $DEVPATH in
> /block/sd?/sd?1)
> 
> 	case $ACTION in
> 	add)
> 		mount -t vfat -o sync /dev/usbst1 /mnt/usbst
> 		;;
> 	remove)
> 		umount /mnt/usbst
> 		;;
> 	esac
> esac

Thanks for your tip.

Now, I have still a problem, I just notice (as it is said in the manpage of 
mount) that I can't use "-o sync" with "-t vfat". I get no error, but the 
behaviour is like it is not mounted with sync option (I even got a awfull 
kernel oops).
Is there a workaround since usb stick need to use vfat and only vfat fs ? I 
would like to stop using supermount with my usb stick, if it's possible. 
Sorry if it's not udev related, maybe you know someone I can ask about that ?


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Re: add/remove actions for usb devices

[Florian Iragne]

Kay Sievers wrote:

>On Sun, Mar 28, 2004 at 03:45:48PM +0200, Florian Iragne wrote:
>  
>
>>ok, i've played a bit with this, but can't have anything working. I've 
>>created /etc/dev/block directory and put a script called xdrive.dev in 
>>this directory.
>>it contains only a echo "something happens" > /var/log/udevEvent
>>
>>nothing in /var/log/udevEvent
>>
>>i've tried to call the script sda1.dev or anything with lower/upper 
>>cases, nothing worked. So, would it be possible to have a little example?
>>    
>>
>
>Is it executable?
>Is the first line '#!/bin/sh'?
>
>Please build udev with 'make DEBUG=true' and have a look at the output in
>syslog. You should get something like this:
>
>  Mar 28 04:15:06 pim udev[8972]: call_foreach_file: unable to open '/etc/dev.d/net'
>  Mar 28 04:15:06 pim udev[8972]: call_foreach_file: open directory '/etc/dev.d/default'
>  Mar 28 04:15:06 pim udev[8972]: call_foreach_file: put file '/etc/dev.d/default/0.dev' in list
>  Mar 28 04:15:06 pim udev[8972]: run_program: running /etc/dev.d/default/0.dev
>  Mar 28 04:15:06 pim logger: /etc/dev.d/default/0.dev /class/net/blind0
>
>thanks,
>Kay
>  
>

maybe i'm wrong, but I understand when Greg told me about this .dev 
scripts that their name define their framework (e.g. : sda1.dev works 
only for event on /dev/sda1) and i don't observe this behaviour 
(actually, all scripts in /et/dev.d/block are called on udev event).

so what is the normal behaviour and is there a way (other than scripting 
to parse device names or other hack)/ a naming scheme to attribute an 
event to only one device (e.g. : sda1.dev do its job only for 
create/destroy of /dev/sda1)?

if it's not the case, is it planned?

thanks a lot

Florian


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Re: add/remove actions for usb devices

[Kay Sievers]

On Sun, Mar 28, 2004 at 08:02:47PM +0200, Florian Iragne wrote:
> 
> 
> Kay Sievers wrote:
> 
> >On Sun, Mar 28, 2004 at 03:45:48PM +0200, Florian Iragne wrote:
> > 
> >
> >>ok, i've played a bit with this, but can't have anything working. I've 
> >>created /etc/dev/block directory and put a script called xdrive.dev in 
> >>this directory.
> >>it contains only a echo "something happens" > /var/log/udevEvent
> >>
> >>nothing in /var/log/udevEvent
> >>
> >>i've tried to call the script sda1.dev or anything with lower/upper 
> >>cases, nothing worked. So, would it be possible to have a little example?
> >>   
> >>
> >
> >Is it executable?
> >Is the first line '#!/bin/sh'?
> >
> >Please build udev with 'make DEBUG=true' and have a look at the output in
> >syslog. You should get something like this:
> >
> > Mar 28 04:15:06 pim udev[8972]: call_foreach_file: unable to open 
> > '/etc/dev.d/net'
> > Mar 28 04:15:06 pim udev[8972]: call_foreach_file: open directory 
> > '/etc/dev.d/default'
> > Mar 28 04:15:06 pim udev[8972]: call_foreach_file: put file 
> > '/etc/dev.d/default/0.dev' in list
> > Mar 28 04:15:06 pim udev[8972]: run_program: running 
> > /etc/dev.d/default/0.dev
> > Mar 28 04:15:06 pim logger: /etc/dev.d/default/0.dev /class/net/blind0
> >
> >thanks,
> >Kay
> > 
> >
> 
> maybe i'm wrong, but I understand when Greg told me about this .dev 
> scripts that their name define their framework (e.g. : sda1.dev works 
> only for event on /dev/sda1) and i don't observe this behaviour 
> (actually, all scripts in /et/dev.d/block are called on udev event).
> 
> so what is the normal behaviour and is there a way (other than scripting 
> to parse device names or other hack)/ a naming scheme to attribute an 
> event to only one device (e.g. : sda1.dev do its job only for 
> create/destroy of /dev/sda1)?

/etc/dev.d/sda1/name.dev should work.


This is what actual happens for /dev/hda:

  Mar 28 19:44:37 pim udev[9323]: dev_d_send: DEVNAME='/udev/hda'
  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: open directory '/etc/dev.d/hda'
  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: unable to open '/etc/dev.d/hda'
  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: open directory '/etc/dev.d/block'
  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: unable to open '/etc/dev.d/block'
  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: open directory '/etc/dev.d/default'
  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: put file '/etc/dev.d/default/1.dev' in list

Kay


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Re: add/remove actions for usb devices

[Florian Iragne]

Kay Sievers wrote:

>/etc/dev.d/sda1/name.dev should work.
>
>
>This is what actual happens for /dev/hda:
>
>  Mar 28 19:44:37 pim udev[9323]: dev_d_send: DEVNAME='/udev/hda'
>  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: open directory '/etc/dev.d/hda'
>  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: unable to open '/etc/dev.d/hda'
>  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: open directory '/etc/dev.d/block'
>  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: unable to open '/etc/dev.d/block'
>  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: open directory '/etc/dev.d/default'
>  Mar 28 19:44:37 pim udev[9323]: call_foreach_file: put file '/etc/dev.d/default/1.dev' in list
>
>Kay
>  
>
ok, back again!!

with your help, i've almost reached my goals. now, i catch add/remove 
events specifically for  the devices i want. BUT (yes there is a 
problem, it would have been too easy), i have a problem on device removal.

here is the udev.rules line : BUS="usb", SYSFS{serial}="0A3703002602", 
KERNEL="sd?1", PROGRAM="/etc/udev/scsi-devfs.sh %k %b %n", NAME="xdrive"

now, i've created a xdrive directory in /etc/dev.d and in this xdrive 
directory, i've  put a script like this one :
echo $ACTION >> /var/log/hotplug
case "$ACTION" in
add)
    mount /dev/xdrive /home/florian/xdrive -osync,umask\00
    ;;
remove)
     umount /home/florian/xdrive
    ;;
esac

exit 0

on device add, it is correctly mounted. on device removal, the system 
freeze and i have to use magic keys to reboot the machine. I've enabled 
kernel verbose debug messgaes and other stuffs like this, but can't get 
any error message.

does anyboddy have an idea to solve this problem? (unfortunately, i 
can't install udev from sources currently, so i can't activate its debug 
mode, or maybe it's possible through a configuration file?)

thanks for helping

Florian


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Re: add/remove actions for usb devices

[Florian Iragne]

jjluza wrote:

>Le dimanche 28 Mars 2004 18:56, vous avez écrit :
>  
>
>>jjluza wrote:
>>    
>>
>>>Now, I have still a problem, I just notice (as it is said in the manpage
>>>of mount) that I can't use "-o sync" with "-t vfat". I get no error, but
>>>the behaviour is like it is not mounted with sync option (I even got a
>>>awfull kernel oops).
>>>Is there a workaround since usb stick need to use vfat and only vfat fs ?
>>>I would like to stop using supermount with my usb stick, if it's
>>>possible. Sorry if it's not udev related, maybe you know someone I can
>>>ask about that ?
>>>      
>>>
>>correct me if i'm wrong, but supermount do mount devices in sync mode,
>>so it has the same behaviour as mounting devices with sync option and
>>umount them after removal.
>>
>>my 2 cents
>>
>>Florian
>>    
>>
>
>
>That's what I thought but it seems that it's not what it does.
>Look at the manpage of mount, you'll see that sync works only with ext2, ext3 
>et ufs.
>I think supermount does more thing than only mounts devices in sync mode.
>  
>
well, where do you see any mention of the limitation of the sync mode to 
ext*/ufs? i've read the manpage of mount several times, but did not find 
anything like the info you mentioned.

Florian


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Re: add/remove actions for usb devices

[Patrick Mansfield]

On Mon, Mar 29, 2004 at 06:21:00PM +0200, Florian Iragne wrote:

> on device add, it is correctly mounted. on device removal, the system 
> freeze and i have to use magic keys to reboot the machine. I've enabled 
> kernel verbose debug messgaes and other stuffs like this, but can't get 
> any error message.
> 
> does anyboddy have an idea to solve this problem? (unfortunately, i 
> can't install udev from sources currently, so i can't activate its debug 
> mode, or maybe it's possible through a configuration file?)

The umount is likely hanging. This is probably a file system feature.

Try without your udev rule - unplug the device and then umount it.

-- Patrick Mansfield


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Re: add/remove actions for usb devices

[Martin Lohmeier]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Monday 29 March 2004 18:21, Florian Iragne wrote:

> echo $ACTION >> /var/log/hotplug
> case "$ACTION" in
> add)
>     mount /dev/xdrive /home/florian/xdrive -osync,umask\00
>     ;;
> remove)
>      umount /home/florian/xdrive
>     ;;
> esac
>
> exit 0

Hi Florian,

I got it working without udev. I had a look at /etc/hotplug/usb.agent and 
there REMOVER was mentioned. Here is my script:

#! /bin/sh
#
# /etc/hotplug/usb/hci_usb
#
if [ "$ACTION" = "add"  ]; then
    cp /etc/hotplug/usb/hci_usb $REMOVER
    # configure network here
fi

if [ "$ACTION" = "remove" ]; then
    touch /tmp/usb_has_been_removed # some debugging
   # reconfigure network here
fi

by, Martin

- -- 
public key available from 
http://ferris.dyndns.info/~blackm/blackm_at_ferris.dyndns.info

Powered by Debian GNU / Linux
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Version: GnuPG v1.2.4 (GNU/Linux)

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Re: add/remove actions for usb devices

[jjluza]

> Florian Iragne wrote :
> on device add, it is correctly mounted. on device removal, the system 
> freeze and i have to use magic keys to reboot the machine.
>
yes, that's the error I get.
I'm pretty sure that's because vfat doesn't support sync mode.
If I don't make udev handle device removal, I can unmount it manually, but it 
freeze too.

> well, where do you see any mention of the limitation of the sync mode to 
> ext*/ufs? i've read the manpage of mount several times, but did not find 
> anything like the info you mentioned.
I have read it on the manual page from debian sid. I have read such a thing on 
several web sites too, after searching on google, but some other sites tell 
we can ... so I'm a bit disappointed.

you can read that from this manpage too :
http://www.netadmintools.com/html/8mount.man.html
> the sync option today has effect only for ext2, ext3 and ufs)


It would be so good if vfat be aware of sync and if my kernel doesn't oops on 
device removal.


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Re: add/remove actions for usb devices

[Florian Iragne]

Patrick Mansfield wrote:
> On Mon, Mar 29, 2004 at 06:21:00PM +0200, Florian Iragne wrote:
> 
> 
>>on device add, it is correctly mounted. on device removal, the system 
>>freeze and i have to use magic keys to reboot the machine. I've enabled 
>>kernel verbose debug messgaes and other stuffs like this, but can't get 
>>any error message.
>>
>>does anyboddy have an idea to solve this problem? (unfortunately, i 
>>can't install udev from sources currently, so i can't activate its debug 
>>mode, or maybe it's possible through a configuration file?)
> 
> 
> The umount is likely hanging. This is probably a file system feature.
> 
> Try without your udev rule - unplug the device and then umount it.
> 
> -- Patrick Mansfield
ok, it's a file system failure, but why?

unplugging the device and then umount it "by hand", or umount the device 
  automatically when it's unplugged, what is the difference? if i make 
umount /dev/myDevice, i believe mount will told me there is a problem, 
but i make "umount /path/to/the/montpoint", which is perfectly right and 
works "by hand" but not automatically with the udev remove event.

I just can't says to users : well, ok, when you unplug your usb stick, 
type umount /home/yourUser/usbStick. I have a working script that does 
just what i want, but it's heavy and not so clean regarding the logical 
behaviour of the system. udev and hotplug have the possibilities i'm 
looking for, so i want to use them.

thanks for helping!

Florian


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Re: add/remove actions for usb devices

[Florian Iragne]

jjluza wrote:
>>Florian Iragne wrote :
>>on device add, it is correctly mounted. on device removal, the system 
>>freeze and i have to use magic keys to reboot the machine.
>>
> 
> yes, that's the error I get.
> I'm pretty sure that's because vfat doesn't support sync mode.

No, i don't think so. I have a script that mount/umount devices 
automatically (wthout using udev event), and it works (with sync mode 
for vfat).

> If I don't make udev handle device removal, I can unmount it manually, but it 
> freeze too.

manually, sometimes it hangs, but not always, and without any error message

>>well, where do you see any mention of the limitation of the sync mode to 
>>ext*/ufs? i've read the manpage of mount several times, but did not find 
>>anything like the info you mentioned.
> 
> I have read it on the manual page from debian sid. I have read such a thing on 
> several web sites too, after searching on google, but some other sites tell 
> we can ... so I'm a bit disappointed.
> 
> you can read that from this manpage too :
> http://www.netadmintools.com/html/8mount.man.html
> 
>>the sync option today has effect only for ext2, ext3 and ufs)
> 
i will read those, but the manpage on my debian sid doesn't seem to be 
the same than yours. ;-)
> 
> 
> It would be so good if vfat be aware of sync and if my kernel doesn't oops on 
> device removal.

yes, it would be good

Florian



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Re: add/remove actions for usb devices

[jjluza]

> Florian Iragne wrote :
> manually, sometimes it hangs, but not always, and without any error message

Are you sure you wrote on your usb-stick when you did the test ? On my system, 
it hangs everytime I write on my usb-stick.
Same question about your script which doesn't use udev events.
And please, upgrade your system, I see no reason that can explain we have not 
the same version of the mount manpage. I have the same than the one on the 
web page I give you before.


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Re: add/remove actions for usb devices

[Florian Iragne]

jjluza wrote:
>>Florian Iragne wrote :
>>manually, sometimes it hangs, but not always, and without any error message
> 
> 
> Are you sure you wrote on your usb-stick when you did the test ? On my system, 
> it hangs everytime I write on my usb-stick.

i'm sure

> Same question about your script which doesn't use udev events.
one more time, i'm sure

> And please, upgrade your system, I see no reason that can explain we have not 
> the same version of the mount manpage. I have the same than the one on the 
> web page I give you before.

Oh, well... i see a resaon why... i must be blind since this info about 
sync is in the manpage, but i didn't see it we i have read it. oups...

so, sync mode doesn't work. i have to find one thing to synchronise 
writings and i absolutely don't want to use supermount!

Florian


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Re: add/remove actions for usb devices

[jjluza]

Florian Iragne wrote
>
> so, sync mode doesn't work. i have to find one thing to synchronise
> writings and i absolutely don't want to use supermount!
>
> Florian

Yes, I would like have it too. I really don't find any information about that 
for the moment, so if someone knows something about this problem with vfat, I 
will be very thankful.


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