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Re: GUID Partition Type and custom partition types
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Re: GUID Partition Type and custom partition types

  • Subject: Re: GUID Partition Type and custom partition types
  • From: Jim O'Connor <email@hidden>
  • Date: Thu, 12 Jul 2007 10:18:30 -0500
Dan,

Thank you so much for the help! I was very confused by the fact that it SEEMED to work, just not for long.


Jim

On Jul 12, 2007, at 10:14 AM, Dan Markarian wrote:

Hey Jim,

<key>Content Hint</key>
<string>Company_NULL_Filtered_HFS 5EA7E2D2- DFD0-4A68-9E7A-3EB6E18DCB64</string> 

This does not work.  You have two options.

The simplest is to create two personalities:

<key>IOKitPersonalities</key>
<dict>
<key>Company_NULL_Filtered_HFS</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.company.iomediafilter.nullfilter</string>
<key>Content Hint</key>
<string>Company_NULL_Filtered_HFS 5EA7E2D2- DFD0-4A68-9E7A-3EB6E18DCB64</string>
<key>IOClass</key>
<string>com_ company_iomediafilter_nullfilter</string>
<key>IOMatchCategory</key>
<string>IOStorage</string>
<key>IOProviderClass</key>
<string>IOMedia</string>
</dict>
<key>5EA7E2D2-DFD0-4A68-9E7A-3EB6E18DCB64</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.company.iomediafilter.nullfilter</string>
<key>Content Hint</key>
<string>5EA7E2D2-DFD0-4A68-9E7A-3EB6E18DCB64</string>
<key>IOClass</key>
<string>com_ company_iomediafilter_nullfilter</string>
<key>IOMatchCategory</key>
<string>IOStorage</string>
<key>IOProviderClass</key>
<string>IOMedia</string>
</dict>
</dict>

The shortest is to use a feature of IOPropertyMatch:

	<key>IOKitPersonalities</key>
	<dict>
		<key>Company_NULL_Filtered_HFS</key>
		<dict>
			<key>CFBundleIdentifier</key>
			<string>com.company.iomediafilter.nullfilter</string>
			<key>IOClass</key>
			<string>com_ company_iomediafilter_nullfilter</string>
			<key>IOMatchCategory</key>
			<string>IOStorage</string>
			<key>IOPropertyMatch</key>
			<array>
				<dict>
					<key>Content Hint</key>
					<string>Company_NULL_Filtered_HFS</string>
				</dict>
				<dict>
					<key>Content Hint</key>
					<string>5EA7E2D2-DFD0-4A68-9E7A-3EB6E18DCB64</string>
				</dict>
			</array>
			<key>IOProviderClass</key>
			<string>IOMedia</string>
		</dict>
	</dict>

Dan

On 11 Jul 2007, at 8:04 PM, Jim O'Connor wrote:

I want my filter to match on EITHER an Apple Partition Table or a Guid Partition Table.

I've set up my Info.plist like so (most of it is straight from the sample code, so I'll assume it is right)...

<key>IOKitPersonalities</key>
<dict>
<key>Company_NULL_Filtered_HFS</key>
<dict>
<key>CFBundleIdentifier</key>
<string>com.company.iomediafilter.nullfilter</string>
<key>Content Hint</key>
<string>Company_NULL_Filtered_HFS 5EA7E2D2- DFD0-4A68-9E7A-3EB6E18DCB64</string>
<key>IOClass</key>
<string>com_ company_iomediafilter_nullfilter</string>
<key>IOMatchCategory</key>
<string>IOStorage</string>
<key>IOProviderClass</key>
<string>IOMedia</string>
</dict>
</dict>

My understanding is that the space separated strings indicate an "or" type of condition. "Some of the keys may take a list of space- delimited values, which are generally examined in an OR fashion." from Driver Personalities and Matching Languages in IOKitFundamentals.

I build this KEXT, test it as the READ ME describes, using both an APT and GPT disk image and everything appears to be happy.

Then leave it alone for a while and when I come back I get:

kextload: NullFilter.kext loaded successfully
hdiutil: attach failed - no mountable file systems"

I remove either the GUID or the Company_NULL_Filtered_HFS from the info.plist and force it to rebuild and run the test again and the one which is in works and the one which is out doesn't.
Wait a minute for the kext to unload.
Put them both back into the hint and either type of disk will work.
Wait a while and neither will work.

There is something going on with the caching of the kext that is messing me up, I guess.

Is there any light to be shed on this? Is this the correct way to make a single KEXT handle either type of partition?


Thanks,
Jim


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References: 


 >Re: GUID Partition Type and custom partition types (From: Jim O'Connor <email@hidden>)


 >Re: GUID Partition Type and custom partition types (From: Dan Markarian <email@hidden>)






    

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