December 2007 - Darwin-kernel

Re: Locking of thread
by Michael Smith 08 Dec '07

08 Dec '07

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Re: Locking of thread
by Rakesh Singhal 08 Dec '07

08 Dec '07

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Re: Locking of thread
by Michael Smith 08 Dec '07

08 Dec '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Dec 8, 2007, at 2:31 AM, Rakesh Singhal wrote: In most cases you should use a workloop. = Mike _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I want to know that which locking functions should i use for an IOKit driver. I am not using workloop in my driver. I am confused that which locking mechanism should I use. This email sent to site_archiver(a)lists.apple.com

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Help Building Kernel for PowerMac G5 Quad
by Rand Childs 08 Dec '07

08 Dec '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com cp xnu-1228/BUILD/obj/RELEASE_PPC/mach_kernel /mach_kernel.new cp /mach_kernel /mach_kernel.orig cp /mach_kernel.new /mach_kernel Thanks Rand _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I have followed Apple's instructions for building the 10.5 kernel and have successfully built mach_kernel. To install it I did the following: I've done this on a portable firewire drive so that I don't screw up by machine. The problem is that I can boot from this kernel on my TI PowerBook G4 which means that the kernel will boot, however, I am unable to boot my PowerMac G5 QUAD. I get the white screen with the apple logo, and then eventually the fans ramp up to full speed. I never see the spinning circle and holding down "command v" doesn't do anything. So, the kernel that I build does work on the TI PowerBook G4, but not on the PowerMac G5 QUAD. It was built on the PowerMac G5 QUAD using Apple's instructions. Does anyone know what I need to do to build a kernel that will boot a PowerMac G5 QUAD? Any help would be appreciated. I couldn't find anything in the list archives. This email sent to site_archiver(a)lists.apple.com

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Re: Sparse files on Mac
by Greg Shenaut 08 Dec '07

08 Dec '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Could you do what you need in a (non booting) UFS partition? Greg Shenaut _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… http://developer.apple.com/documentation/MacOSX/Conceptual/ BPFileSystem/Articles/Comparisons.html This email sent to site_archiver(a)lists.apple.com

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Re: Sparse files on Mac
by Anton Altaparmakov 08 Dec '07

08 Dec '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, Thanks once again, That assumes sparse file support... You need to design your own file system that incorporates HSM as one of its features... If you use internal APIs and/or unsupported APIs then things may break. Best regards, Anton -- Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK Linux NTFS maintainer, http://www.linux-ntfs.org/ _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… On 8 Dec 2007, at 10:37, Damir Dezeljin wrote: You cannot put an HSM application on top of an existing file system or at least not in a reliable way. For example what happens if people access the underlying file system without your HSM KEXT loaded? Yes, I'm aware of such a limitation and it is usually acceptable for HSM products. If the KEXT isn't loaded, there is no data returned. I see. However, I'm concerned about Darwin updates: - Is it possible to implement an entire file system as a KEXT in a supported way -> so to avoid multiple KEXT releases for every Darwin update? Of course! Well, maybe not across major releases like Tiger to Leopard but certainly all updates within Tiger and all updates within Leopard can be expected to continue working as long as your kext uses the supported KPI. - Is it possible to implement a file system as a KEXT at all or will I need to make the 'new file system' part of the kernel and so recompile the entire kernel -> in such a case I can forcast kernel installation problems or at least concern of reinstalling the kernel. Of course it is. Many file systems are implemented as KEXTs! For example MSDOSFS, NTFS, and UDF to name a few and they are not recompiled each time a new kernel is released in a new update (unless they are being updated themselves of course). If this was not the case each software update would be huge as a lot of drivers/file systems are KEXTs and not part of the core kernel. Well, this wasn't a good one :) A good news would now be an Apple commit to implement the SPARSE functionality ASAP << Am I asking too much? :) or at least a workaround :P You can always file a feature request bug report but given this would require massive changes to HFS+/the kernel I doubt very much it would be done in the Leopard time frame if at all ever... But unless you file a feature request people will not know you want this feature so it is definitely worth filing such a request. This email sent to site_archiver(a)lists.apple.com

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Re: Sparse files on Mac
by Damir Dezeljin 08 Dec '07

08 Dec '07

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Locking of thread
by Rakesh Singhal 08 Dec '07

08 Dec '07

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Re: Sparse files on Mac
by Anton Altaparmakov 08 Dec '07

08 Dec '07

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi, No you cannot do that. Best regards, Anton -- Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK Linux NTFS maintainer, http://www.linux-ntfs.org/ _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… On 8 Dec 2007, at 10:15, Damir Dezeljin wrote: The main question is WHY are you trying to do what you are trying to do? I'm working on a HSM (Hierarchical Storage Management) product. The lack of sparse file support seems a big show stopper for implementing such an application. I saw HFS and HFS Plus support resource forks - I'm wondering if the mentioned functionality can be used to display a different file size to the user than the 'real' size of the file on disk. Let suppose the file is truncated to zero length, but I still want to show the original size to the user. Is there any way (also not supported one) to do this? You cannot put an HSM application on top of an existing file system or at least not in a reliable way. For example what happens if people access the underlying file system without your HSM KEXT loaded? You need to design your own file system that incorporates HSM as one of its features... If you don't want to design a file system from scratch you can just take one of the existing ones and modify it so that it supports HSM and then copy its file system driver and modify that to support HSM. Then your product would be the new file system driver + management tools + a "newfs"/"mkfs" application to allow people to create such file systems. (Don't forget to rename the file system so it does not clash with the original one!) But note as things stand at present Mac OS X does not allow booting from a kext based file system so your users would not be able to have their boot file system be your file system. This email sent to site_archiver(a)lists.apple.com

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Re: Sparse files on Mac
by Damir Dezeljin 08 Dec '07

08 Dec '07

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