Hi all,
I would very much appreciate any assistance anyone can offer on the
following:
I am currently running version 2.4.22 of the Kernel and am writing an
application that needs to cope with the removal of card media form a USB
flash card reader.
Hotplug informs me when the card reader itself is added with my intention
being to scan for partition entries at the newly created dev/scsi entry
e.g /dev/scsi/host0/bus0/target0/lun0/part1
and mount any partitions detected.
This works fine -- but I also need to detect when a memory card has been
removed.
I have found that the block device file (part1) corresponding to my flash
card's partition is appropriately updated (i.e removed from
/dev/scsi/host0/bus0/target0/lun0/ when the test card is removed) -- but
only if the partition is *not* currently mounted!
I found that once I have mounted the partition, the devfs 'part1' block
device perpetually remains -- even when the card is removed, thus making
removal detection a tad tricky.
OK, it seems to be possible to unmount the partition, poll the
/dev/scsi/host0/bus0/target0/lun0 entry and then remount once the poller has
determined that the partition is still present -- but this takes time... And
also seems a little extreme (if not ridiculous)...
Does anyone have any ideas on a fix or alternative way to determine removal
of a flash card from a connected flash card reader.
Any suggestions on this problem would be greatly appreciated. Many thanks!
Andrew Marshall
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