Re: hotplug event on fdisk?

[Steven Scholz <steven.scholz@imc-berlin.de>]

Sergey,

>> ...
>>Why is it so? And what is the system suposed to do? Actually remove
>>the device?
> 
> 
> Looking at the size of your device (512 MB), I guess that it is some
> king of flash drive.  Such devices pretend to be removable hard disks -
> and here the "removable" bit causes trouble.

Indeed I was talking about a CF Flash Card in a CF socket.

> ...
> Anyway, here is the patch with such workaround for CompactFlash (against
> the current git tree, but it should also apply to earlier kernels with
> some fuzz).
> 
> ---
> Subject: [PATCH] Avoid superfluous rechecking of partitions for IDE flash drives
> 
> For some reason, IDE flash drives report that they have removable media,
> which is not really correct - the drive as a whole is removed, therefore
> rescanning of the partition table on the first open of such devices is
> just a waste of time.
> 
> Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
> 
> diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
> --- a/drivers/ide/ide-disk.c
> +++ b/drivers/ide/ide-disk.c
> @@ -1174,6 +1174,14 @@ static int idedisk_media_changed(struct 
>  	struct ide_disk_obj *idkp = ide_disk_g(disk);
>  	ide_drive_t *drive = idkp->drive;
>  
> +	/*
> +	 * PCMCIA flash drives report themselves as removable, but can be
> +	 * treated as fixed - when such device is removed, its IDE controller
> +	 * also disappears.
> +	 */
> +	if (drive->is_flash)
> +		return 0;
> +
>  	/* do not scan partitions twice if this is a removable device */
>  	if (drive->attach) {
>  		drive->attach = 0;

Is "drive->is_flash" set for mechanical PCMCIA hard disk drives (like 
Microdrives) as well?

-- 
Steven