Ed Greshko <Ed.Greshko@xxxxxxxxxxx> writes:
> On 07/17/13 12:32, lee wrote:
>> Joe Zeff <joe@xxxxxxx> writes:
>>
>>> On 07/16/2013 08:39 PM, lee wrote:
>>>> Thank you! So I'll just copy the file I want to modify into
>>>> /etc/udev/rules.d/ and delete everything I don't want to modify, that
>>>> should work ...
>>> Please let us know how this works. I'm sure that there are others on
>>> this list who could take advantage of the information.
>> This won't work because when I delete everything else from the copy of
>> the file and leave only what I want, it would mean that everything I
>> might want will not be in effect because my copy of the file would
>> wholly replace the file provided as default.
>>
>> So I can't do this.
>>
>
> Then try this.....
>
> Make a new file with a new name in /etc/udev/rules.d with only your
> specific rules?
Which rules do I need to make for what I'm trying to achieve?
> So, to me, the question would be what is more appropriate.
> 10-mystuff.rules or 99-mystuff.rules.
The man page of udev says:
,----
| All rules files are collectively sorted and processed in lexical
| order, regardless of the directories in which they live.
`----
Something like 'zzzz-blah.rule' might be executed last. Since file
names can contain all kinds of characters and there isn't any way to
close this security hole, like by limiting the characters allowed in
file names, the rule would have to have an unlimited number of whatever
character no. 65535 is as its file name.
So now I have made
/etc/udev/rules.d/zzzz-yun-disable-media-polling.rules:
# disable in-kernel media-presence polling
ACTION=="add", SUBSYSTEM=="module", KERNEL=="block", ATTR{parameters/events_dfl_poll_msecs}!="0", ATTR{parameters/events_dfl_poll_msecs}="0"
I don't know if this is a good idea. If some software wants to poll
some block device now, it could do so nonetheless and might employ a
worse way of doing it. OTOH, I don't see any reason why devices should
be polled every 2 seconds like the default rule specifies. Why would
anyone want that??
How do I apply this rule? Can udev be somehow restarted?
There is another problem with this: My new rule doesn't disable a
default one, it merely overrides the default one. That probably works
in this case, but there's also /usr/lib/udev/rules.d/80-udisks.rules
which has:
# Check if a disk is ATA SMART capable
#
# USB ATA enclosures with a SAT layer
KERNEL=="sd*[!0-9]", ATTR{removable}=="0", ENV{ID_BUS}=="usb", ENV{DEVTYPE}=="disk", IMPORT{program}="udisks-probe-ata-smart $tempnode"
# ATA disks driven by libata
KERNEL=="sd*[!0-9]", ATTR{removable}=="0", ENV{ID_BUS}=="ata", ENV{DEVTYPE}=="disk", IMPORT{program}="udisks-probe-ata-smart $tempnode"
# ATA disks connected via SAS (not driven by libata)
KERNEL=="sd*[!0-9]", ATTR{removable}=="0", ENV{ID_BUS}=="scsi", ENV{DEVTYPE}=="disk", ENV{ID_VENDOR}=="ATA", IMPORT{program}="udisks-probe-ata-smart $tempnode"
If this is what I want to disable, how would I do that?
--
Fedora release 19 (Schrödinger’s Cat)
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