Problem with mounting a device second time.

[Sebastian Huber]

On 04/19/2012 09:15 AM, ali nasir wrote:
> 1. Before calling the ioctl, we ensure that all the files are closed using the fclose.

Ok.

> 2. If we do the ioctl, the unmount() is still succesfull.

Good.

> 3. How do i find the remaining user of the disk? Is there a struct where i can see something?

Please have a look at the following code:

#include <rtems.h>
#include <rtems/diskdevs.h>
#include <rtems/shell.h>

static int do_bdls(int argc, char **argv)
{
	rtems_status_code sc = RTEMS_SUCCESSFUL;
	dev_t dev = (dev_t) -1;
	rtems_disk_device *dd = NULL;

	while (sc == RTEMS_SUCCESSFUL && (dd = rtems_disk_next(dev)) != NULL) {
		printf(
			"%08" PRIx32 ":%08" PRIx32 " %c %s UC=%u BB=%" PRIu32 " BC=%" PRIu32 " BS=%" 
PRIu32 " MBS=%" PRIu32 "\n",
			rtems_filesystem_dev_major_t(dev),
			rtems_filesystem_dev_minor_t(dev),
			dd->phys_dev == dd ? 'P' : 'L',
			dd->name,
			dd->uses,
			dd->start,
			dd->size,
			dd->block_size,
			dd->media_block_size
		);
		dev = rtems_disk_get_device_identifier(dd);
		sc = rtems_disk_release(dd);
	}

	return 0;
}

static rtems_shell_cmd_t bdls_command = {
	"bdls",
	"bdls",
	"bsp",
	do_bdls,
	NULL,
	NULL
};

You can call do_bdls() before and after the ioctl and watch the usage count 
'UC=???'.

-- 
Sebastian Huber, embedded brains GmbH

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