On 06/29/2010 12:38 PM, Harald Hoyer wrote:
On 06/29/2010 01:55 AM, Gerardo Exequiel Pozzi wrote:
Hello
I have a problem with this commit [#1] "cdrom_id: Do not ignore errors
from scsi_cmd_run()" and qemu-kvm-0.12.4.
running /lib/udev/cdrom_id /dev/sr0 does not return
ID_CDROM_MEDIA_TRACK_COUNT_DATA (there is a iso image specified on
qemu-kvm command line, so there is a media present)
Running with --debug show that error is produced (add below)
For working again I done:
1) Only reverting this commit [#1] "cdrom_id: Do not ignore errors from
scsi_cmd_run()"
2) Only revert revert the commit [#2] "cdrom_id: Swap media state and
TOC info probing"
In case (1) no error is displayed and ID_CDROM_MEDIA_TRACK_COUNT_DATA is
printed.
In case (2) error is displayed and ID_CDROM_MEDIA_TRACK_COUNT_DATA is
printed.
As result udev rule that uses this info will fail.
Tested on Linux 2.6.33.5 and 2.6.34, under 32 bits and 64 bits with the
same results.
If need more info, please let me know.
Thanks.
# /lib/udev/cdrom_id --debug /dev/sr0
main: probing: '/dev/sr0'
cd_inquiry: INQUIRY: [QEMU ][QEMU DVD-ROM ][0.12]
cd_profiles: GET CONFIGURATION: size of features buffer 0x0010
cd_profiles: GET CONFIGURATION: feature 'profiles', with 2 entries
feature_profiles: profile 0x10 dvd_rom
feature_profiles: profile 0x08 cd_rom
cd_profiles: current profile 0x08
cd_profiles: profile 0x08 media_cd_rom
info_scsi_cmd_err: READ DISC INFORMATION failed with
SK=5h/ASC=20h/ACQ=00h
ID_CDROM=1
ID_CDROM_CD=1
ID_CDROM_DVD=1
ID_CDROM_MRW=1
ID_CDROM_MRW_W=1
ID_CDROM_MEDIA=1
ID_CDROM_MEDIA_CD=1
[#1]
http://git.kernel.org/?p=linux/hotplug/udev.git;a=commitdiff;h=58e178894bfc040834e1270c6fe9b9fdef513550#patch1
[#2]
http://git.kernel.org/?p=linux/hotplug/udev.git;a=commitdiff;h=30e3b1a0d3a3ec76f16736470dc656744848d941
Apparently qemu does not implement the scsi "READ DISC INFORMATION"
command for cdroms.
Filed on the Red Hat bugzilla
https://bugzilla.redhat.com/show_bug.cgi?id=609049
Comment of Gerardo Exequiel Pozzi
Additional note: This only fail with IDE cd-rom, SCSI cd-rom works OK
With "-drive file=xyz.iso,if=scsi,media=cdrom" works fine, but with "-drive
file=xyz.iso,if=ide,media=cdrom" (or directly -cdrom) fails.
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