UDEV mount event not generated

UDEV mount event not generated

[mariodebian]

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Hi all.

I'm developing an embeded thin client system based on initramfs using
debian kernel bins, and libs: www.tcosproject.org

I'm using debian unstable (udev 0.114-2 ).

My thin client remote devices manager (tcos-devices-ng.py [1]) uses udev
events, I load events using a XMLRPC server running on thin client.


1.- I have created one simple udev rule [2]:

SUBSYSTEM=="block",  RUN+="/sbin/tcos-udevd.sh"


tcos-udev.sh [2] script is called in every udev block event.


Some time ago (when I start developing this tools) I filter this events
in my python app:

self.udev_events={
  "insert":       {"ID_BUS":  "usb",         "ACTION":"add"},
  "remove":       {"ID_BUS":  "usb",         "ACTION":"remove"},
  "mount-floppy": {"DEVPATH": "/block/fd0",  "ACTION":"mount"},
  "umount-floppy":{"DEVPATH": "/block/fd0",  "ACTION":"umount"},
  "mount-cdrom":  {"DEVPATH": "/block/hd*",   "ACTION":"mount"},
  "umount-cdrom": {"DEVPATH": "/block/hd*",   "ACTION":"umount"},
  "mount-flash":  {"DEVPATH": "/block/sd*",   "ACTION":"mount"},
  "umount-flash": {"DEVPATH": "/block/sd*",   "ACTION":"umount"}
}


This is the meaning of every element:

  "udev-event-name": {"condition1":"condition1", "cond2":"cond2"}



All actions worked ok:

* add (tell thin client to mount DEVNAME)
* remove (tell thin client to umount all parts in DEVNAME)
* mount (show a message: Device XXX is ready)
* umount (show a message: You can unplug device XXX)


In 2007 June this tools works ok (don't remember udev version) [3]

I don't know when mount/umount stop working, but from some weeks ago I
can see mount/umount messages.

Why udev don't send mount/umount block events to my app?

Any ideas?
Bad rules file?


Thanks for your work

[1]
http://trac.tcosproject.org/browser/trunk/tcosmonitor/tcos-devices-ng.py?rev=444
[2] http://trac.tcosproject.org/browser/trunk/tcosmonitor/udev
[3] http://www.tcosproject.org/tcos-devices-ng/ (screencast)

-- 
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http://soleup.eup.uva.es/mariodebian

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Re: UDEV mount event not generated

[Kay Sievers]

On 8/30/07, mariodebian <mariodebian@gmail.com> wrote:
> I'm developing an embeded thin client system based on initramfs using
> debian kernel bins, and libs: www.tcosproject.org
>
> I'm using debian unstable (udev 0.114-2 ).
>
> My thin client remote devices manager (tcos-devices-ng.py [1]) uses udev
> events, I load events using a XMLRPC server running on thin client.
>
>
> 1.- I have created one simple udev rule [2]:
>
> SUBSYSTEM="block",  RUN+="/sbin/tcos-udevd.sh"
>
>
> tcos-udev.sh [2] script is called in every udev block event.
>
>
> Some time ago (when I start developing this tools) I filter this events
> in my python app:
>
> self.udev_events={
>   "insert":       {"ID_BUS":  "usb",         "ACTION":"add"},
>   "remove":       {"ID_BUS":  "usb",         "ACTION":"remove"},
>   "mount-floppy": {"DEVPATH": "/block/fd0",  "ACTION":"mount"},
>   "umount-floppy":{"DEVPATH": "/block/fd0",  "ACTION":"umount"},
>   "mount-cdrom":  {"DEVPATH": "/block/hd*",   "ACTION":"mount"},
>   "umount-cdrom": {"DEVPATH": "/block/hd*",   "ACTION":"umount"},
>   "mount-flash":  {"DEVPATH": "/block/sd*",   "ACTION":"mount"},
>   "umount-flash": {"DEVPATH": "/block/sd*",   "ACTION":"umount"}
> }
>
>
> This is the meaning of every element:
>
>   "udev-event-name": {"condition1":"condition1", "cond2":"cond2"}
>
> All actions worked ok:
>
> * add (tell thin client to mount DEVNAME)
> * remove (tell thin client to umount all parts in DEVNAME)
> * mount (show a message: Device XXX is ready)
> * umount (show a message: You can unplug device XXX)
>
>
> In 2007 June this tools works ok (don't remember udev version) [3]
>
> I don't know when mount/umount stop working, but from some weeks ago I
> can see mount/umount messages.
>
> Why udev don't send mount/umount block events to my app?
>
> Any ideas?
> Bad rules file?

These events were deprecated, and are removed from the kernel. They
didn't work correctly for all setups. You can poll() the /proc/mounts
file to get notifications about mount tree changes.

Udev will not see any of these events. You may just plug into HAL,
which sends events for all that stuff. Look at "lshal --monitor".

Kay

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Re: UDEV mount event not generated

[mariodebian]

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[...]

> These events were deprecated, and are removed from the kernel. They
> didn't work correctly for all setups. You can poll() the /proc/mounts
> file to get notifications about mount tree changes.
> 

Thanks for quick answer!!!

From which kernel version are removed? Where can i search for this?

I'm started a simple C app to poll() /proc/mounts and returns udev
mount/umount events

> Udev will not see any of these events. You may just plug into HAL,
> which sends events for all that stuff. Look at "lshal --monitor".
> 

Hal is not an option because thin client have only the essential
software: kernel + udev + Xorg + other minor utils

 
Many thanks for your help

> Kay
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Re: UDEV mount event not generated

[Kay Sievers]

On 8/30/07, mariodebian <mariodebian@gmail.com> wrote:
> [...]
>
> > These events were deprecated, and are removed from the kernel. They
> > didn't work correctly for all setups. You can poll() the /proc/mounts
> > file to get notifications about mount tree changes.
> >
>
> Thanks for quick answer!!!
>
> From which kernel version are removed? Where can i search for this?

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h106d46f51a1a72fdbf071ebc0800a9bcfcbc544

Kay

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