* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
@ 2004-01-09 20:10 ` Kay Sievers
2004-01-09 20:12 ` Greg KH
` (12 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Kay Sievers @ 2004-01-09 20:10 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 09, 2004 at 11:11:21AM -0800, Jon Smirl wrote:
> When I stopped udev to switch I noticed that it does not remove /dri/card0. I
> removed the rule that puts card0 in a subdir and it was removed ok. So it looks
> like udev stop is not applying rules for finding things in subdirs.
Do you mean the init script with "stop"? I never tried it :)
udev is not evaluating any rule if you call it with the remove action,
it asks its data base for the filename. I expect the problem somewhere
else.
Could you provide the debug for the failing remove action?
thanks,
Kay
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
2004-01-09 20:10 ` Kay Sievers
@ 2004-01-09 20:12 ` Greg KH
2004-01-09 20:28 ` Jon Smirl
` (11 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Greg KH @ 2004-01-09 20:12 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 09, 2004 at 11:11:21AM -0800, Jon Smirl wrote:
> I just updated to the latest bk version of udev.
>
> When I stopped udev to switch I noticed that it does not remove /dri/card0. I
> removed the rule that puts card0 in a subdir and it was removed ok. So it looks
> like udev stop is not applying rules for finding things in subdirs.
Can you show me the rule, and the log when the device is removed?
It should work.
thanks,
greg k-h
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
2004-01-09 20:10 ` Kay Sievers
2004-01-09 20:12 ` Greg KH
@ 2004-01-09 20:28 ` Jon Smirl
2004-01-09 20:35 ` Kay Sievers
` (10 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Jon Smirl @ 2004-01-09 20:28 UTC (permalink / raw)
To: linux-hotplug
The init scipts aren't the problem, same problem happens when I remove my kernel
module.
On add I have a rule like this:
REPLACE, KERNEL="card*", NAME="dri/card%n"
This causes the device node to be created in:
/udev/dri/card0
The remove event does not delete this device node.
If I get rid of the rule it works fine.
Where do the add/remove of the device nodes in the udev directory occur? When
this code is removing the device node it needs to transform the name through the
rules first. It should also clean up an empty subdirs.
--- Kay Sievers <kay.sievers@vrfy.org> wrote:
> On Fri, Jan 09, 2004 at 11:11:21AM -0800, Jon Smirl wrote:
>
> > When I stopped udev to switch I noticed that it does not remove /dri/card0.
> I
> > removed the rule that puts card0 in a subdir and it was removed ok. So it
> looks
> > like udev stop is not applying rules for finding things in subdirs.
>
> Do you mean the init script with "stop"? I never tried it :)
>
> udev is not evaluating any rule if you call it with the remove action,
> it asks its data base for the filename. I expect the problem somewhere
> else.
>
> Could you provide the debug for the failing remove action?
>
> thanks,
> Kay
==Jon Smirl
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (2 preceding siblings ...)
2004-01-09 20:28 ` Jon Smirl
@ 2004-01-09 20:35 ` Kay Sievers
2004-01-09 20:41 ` Jon Smirl
` (9 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Kay Sievers @ 2004-01-09 20:35 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 09, 2004 at 12:28:16PM -0800, Jon Smirl wrote:
> On add I have a rule like this:
> REPLACE, KERNEL="card*", NAME="dri/card%n"
> This causes the device node to be created in:
> /udev/dri/card0
> The remove event does not delete this device node.
> If I get rid of the rule it works fine.
>
> Where do the add/remove of the device nodes in the udev directory occur? When
> this code is removing the device node it needs to transform the name through the
> rules first. It should also clean up an empty subdirs.
Yes, it does clean up empty subdirs.
And as I said the rule is never used at remove. udev asks its data base
or falls back on the default name. That propably why removing the rule
works for you. Maybe it's not possible for udev to put the name in
its data base at creation time.
So we definitely need the debug for the create and remove event.
Kay
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (3 preceding siblings ...)
2004-01-09 20:35 ` Kay Sievers
@ 2004-01-09 20:41 ` Jon Smirl
2004-01-09 20:50 ` Kay Sievers
` (8 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Jon Smirl @ 2004-01-09 20:41 UTC (permalink / raw)
To: linux-hotplug
i rebuilt with debug=true.
Where is the output going?
I have kernel debug messages going to /var/log/debug
--- Kay Sievers <kay.sievers@vrfy.org> wrote:
> On Fri, Jan 09, 2004 at 12:28:16PM -0800, Jon Smirl wrote:
>
> > On add I have a rule like this:
> > REPLACE, KERNEL="card*", NAME="dri/card%n"
> > This causes the device node to be created in:
> > /udev/dri/card0
> > The remove event does not delete this device node.
> > If I get rid of the rule it works fine.
> >
> > Where do the add/remove of the device nodes in the udev directory occur?
> When
> > this code is removing the device node it needs to transform the name through
> the
> > rules first. It should also clean up an empty subdirs.
>
> Yes, it does clean up empty subdirs.
> And as I said the rule is never used at remove. udev asks its data base
> or falls back on the default name. That propably why removing the rule
> works for you. Maybe it's not possible for udev to put the name in
> its data base at creation time.
>
> So we definitely need the debug for the create and remove event.
>
> Kay
==Jon Smirl
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (4 preceding siblings ...)
2004-01-09 20:41 ` Jon Smirl
@ 2004-01-09 20:50 ` Kay Sievers
2004-01-09 21:20 ` Jon Smirl
` (7 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Kay Sievers @ 2004-01-09 20:50 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 09, 2004 at 12:41:18PM -0800, Jon Smirl wrote:
> i rebuilt with debug=true.
> Where is the output going?
> I have kernel debug messages going to /var/log/debug
>
It's uppercase "make DEBUG=true".
And it's userspace debug not kernel debug.
You may look in /var/log/syslog or /var/log/messages.
You may also try to remove the database and test it:
"rm /udev/.udev.tdb"
After module load udev should have created a new one.
Kay
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (5 preceding siblings ...)
2004-01-09 20:50 ` Kay Sievers
@ 2004-01-09 21:20 ` Jon Smirl
2004-01-09 23:09 ` Greg KH
` (6 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Jon Smirl @ 2004-01-09 21:20 UTC (permalink / raw)
To: linux-hotplug
[root@smirl drm]# udev dri
<7>main: version 012_bk
<7>get_dirs: sysfs_path='/sys'
<7>parse_config_file: reading '/etc/udev/udev.conf' as config file
<7>main: called by hotplug
<7>udev_hotplug: looking at '/class/dri/card0'
<7>namedev_init_rules: reading '/etc/udev/udev.rules' as rules file
<7>namedev_init_permissions: reading '/etc/udev/udev.permissions' as permissions
file
<7>sleep_for_dev: looking for '/sys/class/dri/card0/dev'
<7>get_class_dev: looking at '/sys/class/dri/card0'
<7>get_class_dev: class_dev->name='card0'
<7>get_major_minor: dev='226:0
'
<7>get_major_minor: found major"6, minor=0
<7>get_sysfs_device: filename = /sys/class/dri/card0
<7>get_sysfs_device: looking for '/sys/class/dri/card0/device'
<7>sysfs_path_is_link: stat() failed
<7>sysfs_path_is_link: stat() failed
<7>sysfs_path_is_link: stat() failed
<7>sysfs_path_is_link: stat() failed
<7>sysfs_path_is_link: stat() failed
<7>namedev_name_device:
sysfs_device->path='/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0'
<7>namedev_name_device: sysfs_device->bus_id='0000:01:00.0'
<7>namedev_name_device: sysfs_device->bus='pci'
<7>wait_for_device_to_initialize: looking for file 'vendor' on bus 'pci'
<7>namedev_name_device: kernel_number='0'
<7>do_callout: dev->bus='scsi' sysfs_device->bus='pci'
<7>do_label: dev->bus='usb' sysfs_device->bus='pci'
<7>do_label: dev->bus='usb' sysfs_device->bus='pci'
<7>do_label: dev->bus='usb' sysfs_device->bus='pci'
<7>do_number: dev->bus='pci' sysfs_device->bus='pci'
<7>do_number: search '00:0b.0' in '/0000:01:00.0',
path='/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0'
<7>do_number: search '00:0b.0' in '/0000:00:01.0',
path='/sys/devices/pci0000:00/0000:00:01.0'
<7>do_number: dev->bus='pci' sysfs_device->bus='pci'
<7>do_number: search '00:07.1' in '/0000:01:00.0',
path='/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0'
<7>do_number: search '00:07.1' in '/0000:00:01.0',
path='/sys/devices/pci0000:00/0000:00:01.0'
<7>do_topology: dev->bus='usb' sysfs_device->bus='pci'
<7>do_topology: dev->bus='usb' sysfs_device->bus='pci'
<7>do_topology: dev->bus='usb' sysfs_device->bus='pci'
<7>do_replace: compare name 'ttyUSB1' with 'card0'
<7>do_replace: compare name 'ttyUSB0' with 'card0'
<7>do_replace: compare name 'card*' with 'card0'
<7>do_replace: found name, 'card*' becomes 'dri/card%n'
<7>apply_format: substitute kernel number '0'
<7>namedev_name_device: name, 'dri/card0' is going to have owner='', group='',
mode = 0600
<7>udev_add_device: udevdb_add_dev failed, but we are going to try to create the
node anyway. But remove might not work properly for this device.
<7>udev_add_device: name='dri/card0'
<7>create_node: mknod(/udev/dri/card0, 020600, 226, 0)
<7>create_node: mknod(/udev/dri/card0, 020600, 226, 0) failed with error '17'
<7>create_node: chmod(/udev/dri/card0, 020600)
[root@smirl drm]#
==Jon Smirl
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (6 preceding siblings ...)
2004-01-09 21:20 ` Jon Smirl
@ 2004-01-09 23:09 ` Greg KH
2004-01-09 23:47 ` Kay Sievers
` (5 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Greg KH @ 2004-01-09 23:09 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 09, 2004 at 01:20:27PM -0800, Jon Smirl wrote:
> <7>udev_add_device: udevdb_add_dev failed, but we are going to try to create the
> node anyway. But remove might not work properly for this device.
I think that's your problem :)
greg k-h
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (7 preceding siblings ...)
2004-01-09 23:09 ` Greg KH
@ 2004-01-09 23:47 ` Kay Sievers
2004-01-10 3:07 ` Jon Smirl
` (4 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Kay Sievers @ 2004-01-09 23:47 UTC (permalink / raw)
To: linux-hotplug
On Fri, Jan 09, 2004 at 01:20:27PM -0800, Jon Smirl wrote:
> <7>create_node: mknod(/udev/dri/card0, 020600, 226, 0) failed with error '17'
What are you expecting? The file is already there.
Please do:
rm -rf /udev/dri
rm /udev/.udev.tdb
before any further testing.
Where is the debug for the remove event?
You posted the add event while the node is already there :)
Kay
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (8 preceding siblings ...)
2004-01-09 23:47 ` Kay Sievers
@ 2004-01-10 3:07 ` Jon Smirl
2004-01-10 18:49 ` Jon Smirl
` (3 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Jon Smirl @ 2004-01-10 3:07 UTC (permalink / raw)
To: linux-hotplug
Greg was the closest to the real problem, the real problem is that I am out of
disk space on the tmpfs where I placed udev. I was not expecting a hidden
database containing 120 entries to be 100Kb in size. Db must not be very dense.
I bzipped it down to 2.5K.
--- Greg KH <greg@kroah.com> wrote:
> On Fri, Jan 09, 2004 at 01:20:27PM -0800, Jon Smirl wrote:
> > <7>udev_add_device: udevdb_add_dev failed, but we are going to try to create
> the
> > node anyway. But remove might not work properly for this device.
>
> I think that's your problem :)
==Jon Smirl
jonsmirl@yahoo.com
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (9 preceding siblings ...)
2004-01-10 3:07 ` Jon Smirl
@ 2004-01-10 18:49 ` Jon Smirl
2004-01-13 0:59 ` Greg KH
` (2 subsequent siblings)
13 siblings, 0 replies; 15+ messages in thread
From: Jon Smirl @ 2004-01-10 18:49 UTC (permalink / raw)
To: linux-hotplug
It it possible to add a better error message for the out of disk space case?
Doesn't the 100Kb database file defeat the whole point of making udev small
using klibc? It might be better to just make the db into a flat file, read it
all into RAM, maniplulate it, and write it all back.
--- Jon Smirl <jonsmirl@yahoo.com> wrote:
> Greg was the closest to the real problem, the real problem is that I am out of
> disk space on the tmpfs where I placed udev. I was not expecting a hidden
> database containing 120 entries to be 100Kb in size. Db must not be very
> dense.
> I bzipped it down to 2.5K.
==Jon Smirl
jonsmirl@yahoo.com
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (10 preceding siblings ...)
2004-01-10 18:49 ` Jon Smirl
@ 2004-01-13 0:59 ` Greg KH
2004-01-13 1:53 ` Jon Smirl
2004-01-13 2:03 ` Greg KH
13 siblings, 0 replies; 15+ messages in thread
From: Greg KH @ 2004-01-13 0:59 UTC (permalink / raw)
To: linux-hotplug
On Sat, Jan 10, 2004 at 10:49:18AM -0800, Jon Smirl wrote:
> It it possible to add a better error message for the out of disk space case?
>
> Doesn't the 100Kb database file defeat the whole point of making udev small
> using klibc?
No. 100Kb database being stored on disk is pretty tiny in the long
run...
> It might be better to just make the db into a flat file, read it
> all into RAM, maniplulate it, and write it all back.
But then we end up writing our own "mini db" code, right? tdb is pretty
nice and tiny as it is.
But if it really bugs you, create a patch :)
thanks,
greg k-h
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (11 preceding siblings ...)
2004-01-13 0:59 ` Greg KH
@ 2004-01-13 1:53 ` Jon Smirl
2004-01-13 2:03 ` Greg KH
13 siblings, 0 replies; 15+ messages in thread
From: Jon Smirl @ 2004-01-13 1:53 UTC (permalink / raw)
To: linux-hotplug
--- Greg KH <greg@kroah.com> wrote:
> On Sat, Jan 10, 2004 at 10:49:18AM -0800, Jon Smirl wrote:
> > It it possible to add a better error message for the out of disk space case?
> >
> > Doesn't the 100Kb database file defeat the whole point of making udev small
> > using klibc?
>
> No. 100Kb database being stored on disk is pretty tiny in the long
> run...
What about embedded systems where the 100Kb is going in ram or flash?
Does the db engine return an out of disk space error? I wasn't able to see any
kind of error until I did a debug build and even debug the message was simply
"database error".
Tinydb is a disk based database. Is anyone familar with an in-memory style
database that might be smaller?
==Jon Smirl
jonsmirl@yahoo.com
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^ permalink raw reply [flat|nested] 15+ messages in thread* Re: remove nodes in a directory
2004-01-09 19:11 remove nodes in a directory Jon Smirl
` (12 preceding siblings ...)
2004-01-13 1:53 ` Jon Smirl
@ 2004-01-13 2:03 ` Greg KH
13 siblings, 0 replies; 15+ messages in thread
From: Greg KH @ 2004-01-13 2:03 UTC (permalink / raw)
To: linux-hotplug
On Mon, Jan 12, 2004 at 05:53:12PM -0800, Jon Smirl wrote:
> --- Greg KH <greg@kroah.com> wrote:
> > On Sat, Jan 10, 2004 at 10:49:18AM -0800, Jon Smirl wrote:
> > > It it possible to add a better error message for the out of disk space case?
> > >
> > > Doesn't the 100Kb database file defeat the whole point of making udev small
> > > using klibc?
> >
> > No. 100Kb database being stored on disk is pretty tiny in the long
> > run...
>
> What about embedded systems where the 100Kb is going in ram or flash?
I don't know. Do you have one? Is that excessive? Do the benefits of
udev outweigh the extra disk space for the database for you?
> Does the db engine return an out of disk space error? I wasn't able to see any
> kind of error until I did a debug build and even debug the message was simply
> "database error".
Hm, don't know, I'll look into that.
> Tinydb is a disk based database. Is anyone familar with an in-memory style
> database that might be smaller?
Once we have udevd in place, tinydb can be switched over to run
in-memory. It's just a simple 1 argument change in udev to do this :)
thanks,
greg k-h
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