site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com --- At Thu, 16 Aug 2007 12:20:05 -0400, Dan Markarian wrote:

Hey Duane,

You have to eliminate O_SHLOCK then. You can use Disk Arbitration to unmount all the volumes on the disk first.

Thanks Dan. That works well. ...Duane

On 16 Aug 2007, at 11:38 AM, Duane Murphy wrote:

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--- At Thu, 16 Aug 2007 10:53:50 -0400, Dan Markarian wrote:

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Hey Duane,

We do not detect live changes to a partition map in Tiger.

Thanks. Then I am back to my original question. When Disk Utility (diskutil) partitions a drive it takes it off-line then puts it back on- line. Clearly this causes everything to be re-read.

I'd like to do the same thing. Disk Arbitration doesn't seem quite the right tool for doing this. In fact even Disk Utility does not fully "eject" a firewire disk unless it is partitioning.

I surely don't want to request the user to restart just to re-read changes to a disk.

Is there somewhere I should look for how to do this? Another mailing list?

Thanks for the help.

...

On 15 Aug 2007, at 9:58 PM, Duane Murphy wrote:

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--- At Wed, 15 Aug 2007 17:26:42 -0700, Chris Sarcone wrote:

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Duane --

I'm making changes to GUID partition disks partition table, and I would like the system to re-read the disk in order to recognize new partitions on the disk.

What do I need to do to get the system to re-read the disk and recognize the changes?

I've tried several disk util commands (unmountDisk, mountDisk, and eject) but they don't re-read the disk.

Disk Utility->Eject does the same thing (ie nothing).

I note that this is a FireWire drive, but it could also be an internal drive or any other non-network drive.

For example, when Disk Utility partitions a disk, it fully unmounts and then remounts the disk. How can I do the same thing?

Try opening and closing the raw disk node for the whole device.

Hi Chris, That's what I was told. In fact, I am editing the partition table using / dev/rdisk1 (or whatever number). But when it is closed it doesn't do anything.

Here's how I open. inDisk is "/dev/rdisk1" (for example); int diskDescriptor = open( inDisk, O_RDWR | O_SHLOCK, S_IRUSR | S_IWUSR | S_IRGRP );

later I just

close( diskDescriptor );

There's no errors and in fact, the disk is nicely edited. If I unplug the drive and plug it back in the partitions looks exactly like what I want, but it's hard to do that for internal disks. :-)

...Duane _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com