USB Media card - works at boot-up, removal works, re-insert doesn't

[David Zeuthen]

On Tue, 2004-09-21 at 19:02 +0100, Luke Kenneth Casson Leighton wrote:
> hello hello, well i can live with floopies appearing as two thingies
> in KVM, however USB media cards not quite working i can't.  i'm
> uploading a typescript and a lshal to http://hands.com/~lkcl
> 
> what's happening:
> 
> - boot up with a USB media card inserted, it gets mounted, it gets
>   found fine, KVM is happy, everything is hunky-dory.
> 
>   it's one of those USB media readers with four partitions, one per
>   each of the 5-in-1 usb card slots (err.. four... five... errr..)
>   okay it's a 5-in-1 usb card reader, but there are only four
>   partitions.  um.
> 

I think you mean to say four LUN's rather than four partitions.

> - remove the media card, it disappears, everything is fine.
>
>   i observe that hald, every 2 seconds, says it's trying to re-read
>   the partition table for /dev/sdc.
> 

You should be getting the hotplug events - it looks like [1] for me.

> - re-insert the media card: no observable events occur, no KVM
>   response, no HAL log messages saying "mounted, off we go".
> 
>   i observe that hald stops saying it's trying to re-read the
>   partition table.
> 
> - manually do a mount /media/usbdisk7 (corresponding to /dev/sdc1).
>   HAL responds by going "oo, /etc/mtab changed" and off it goes
>   notifying KVM which responds by plopping the volume icon on
>   the devices list.
> 
> 
> the bit that's obviously gone haywire is the
> linux/block_class_device.c:457 rereading partition table thing /dev/sdc
> 
> reading more closely, the comments say "all this work [ioctl("/dev/sdc",
> BLKRRPART)] should result in hotplug events to actually remove the
> child devices".
> 
> clearly that ain't happening!!!
> 

Trivial questions, but best I can think of: Is hal.hotplug setup
correctly in /etc/hotplug.d/default, is hotplug enabled, did the kernel
oops?

> 
> okay... i found out some more info.
> 
> i put in a strerror(errno) message and it says "Device busy" from
> that ioctl.
> 
> re-running the process above, i notice a "running forced unmount" thing
> happening...
> 
> the failure means that KDE still has file handles open on
> /media/usbdisk7.
> 
> i'm going to change the umount to a umount -l -f and see what happens...
> 

hald already does 'umount -l' if we detect lack of media in a drive and
there exist mounted volumes for that drive.

David

[1] :

20:47:44.557 [I] linux/block_class_device.c:466: Rereading partition table for /dev/sdd
20:47:44.708 [I] linux/osspec.c:1291: action=remove, seqnum=0  subsystem=block devpath=/block/sdd/sdd1 devname=/dev/sdd1
20:47:44.708 [I] linux/osspec.c:1511: Queing up seqnum=317, sysfspath=/block/sdd/sdd1, subsys=block
20:47:44.708 [I] linux/osspec.c:1232: action=remove seqnum=317 subsystem=block sysfs_path=/sys/block/sdd/sdd1
20:47:44.708 [I] linux/osspec.c:1024: in remove_device for udi=/org/freedesktop/Hal/devices/block_8_49
20:47:44.709 [I] linux/osspec.c:1366: ******************************************
20:47:44.709 [I] linux/osspec.c:1367: **** hotplug_counter is now 1
20:47:44.709 [I] linux/osspec.c:1368: ******************************************
20:47:44.709 [I] callout.c:332: Invoking /etc/hal/device.d/40-hal-hotplug-map.hal
20:47:44.755 [I] callout.c:332: Invoking /etc/hal/device.d/printer_remove.hal
20:47:45.034 [I] callout.c:332: Invoking /etc/hal/device.d/50-fstab-sync.hal
12831: ###################################
12831: fstab-sync entering; remove udi=/org/freedesktop/Hal/devices/block_8_49
12831: mount_root=/media use_managed=yes managed_keyword=kudzu
12831: Acquiring advisory lock on /etc/fstab
12831: Lock acquired
12831: using temporary file '/etc/.fstab.hal.v'
12831: removed mount point for device '/dev/sdd1'
12831: Releasing advisory lock on /etc/fstab
12831: Lock released
12831: fstab-sync exiting; remove udi=/org/freedesktop/Hal/devices/block_8_49
12831: ###################################

20:47:45.490 [I] linux/osspec.c:980: in remove_callouts_finished for udi=/org/freedesktop/Hal/devices/block_8_49
20:47:45.490 [I] hald.c:83: Removed device from GDL; udi=/org/freedesktop/Hal/devices/block_8_49
20:47:45.490 [I] linux/osspec.c:1379: ==========================================
20:47:45.490 [I] linux/osspec.c:1380: ==== hotplug_counter is now 0
20:47:45.490 [I] linux/osspec.c:1381: ==========================================
20:47:46.601 [I] linux/block_class_device.c:2310: Directory /etc changed


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