February 2008 - Darwin-kernel

Re: hints for a "virtual disk" implementation
by Jean-Francois Roy 22 Feb '08

22 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On Feb 22, 2008, at 09:28, Valentin Slavov wrote: Yeah, I thought about that but you can't put a 16TB file in a sparse image (the image grows, even if the file contains only zeroes). Sparse files would be great but unfortunately HFS+ doesn't support them. _______________________________________________ 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 would try using MacFUSE to build a simple filesystem that pretends to have very large files in it. It would probably result in far many less hours of work to get what you need. This email sent to site_archiver(a)lists.apple.com

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Re: Vnode documentation
by Sorin Negoita 22 Feb '08

22 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:mime-version:content-type; bh=gIcN1ZOVGxsyuxOFty9+QqLPWC9LXMIh2A8s46ZzeUA=; b=ZZ4PYfrMtc/IwsAs/lUJYqlrucmMgMIn+hZE+KuH2k8Z/jd3aa/ZqnED5+F0sRaavW2ZCaItNYs3v0zfjWuaP9QKMqN+IF/YW7CR6Ee1zWv97xWizTegc0i3t3UbFv3yd7yhiGnqCySAgmZXLJfG/vEIHqtdI63r7kP7QvuWsjg= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type; b=lCoYPrmgA8DhVpMMico02fJXN2/aual13qzvXEoiuBLx/d3/931HVcWm/zQdFqNzZCLOYbYMougWu/01tUMbGF/vE96RmtjEYfgTgVPvweRxnwggDUoqKmGp7pRkgBYqSD5DWnqo9okXTd1cPNmXvqRAQkTAEKJhOwd3CUK1/9Y= int vn_getpath( struct vnode *vp, char *pathbuf, int *len); Alas, such documentation does not exist. <http://developer.apple.com/qa/qa2001/qa1242.html> Sorry that we don't have a better answer )-: _______________________________________________ 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.… This email sent to site_archiver(a)lists.apple.com Documentation for the VFS KPI does not exist anymore, but it was present in the past at the link I've specified below. I still have the local documentation, here it is a description of a function: vn_getpath int vn_getpath( struct vnode *vp, char *pathbuf, int *len); Discussion Description forthcoming Even in the DTS Q&A 1242 you mentioned it says: "Documentation for the VFS KPI is still rather rudimentary. Apple will rectify this in the future (r. 3524590); in the meantime, this Q&A includes a list of references to documentation and other resources.". By the way, how/where can I see these rdar problems ??? So, will docs for VFS KPI be updated or did they disappeared for undefined time ??? Thank you ! At 12:03 +0200 21/2/08, Sorin Negoita wrote: I was wondering what happened with the vnode online documentation from <http://developer.apple.com/documentation/Darwin/Reference/KPI_Reference/vno…>http://developer.apple.com/documentation/Darwin/Reference/KPI_Reference/vno…. Now it sais "Page not found" and it redirects me to the KPI Reference page, but the vnode related functions are missing. Does anynody know another page with vnode docs because I couldn't find one :( DTS Q&A 1242 "Developing For VFS" has a reasonably up-to-date summary of the state of VFS plug-in development on Mac OS X. If you have specific questions I'd be happy to help out (either here or on <http://lists.apple.com/mailman/listinfo/filesystem-dev>).

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Re: hints for a "virtual disk" implementation
by Valentin Slavov 22 Feb '08

22 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=rPZg7OITA/vVdZM+9clYsOBnBLuzRaRGqrimIHItBIA=; b=t4lRt2npOBXeDQgxuNRoA1/u5YPA8gk6CPV7z9yfTk5ipKTu5O7Vq1eflwQcF2N38pySXydlQ0k9HAhWjgKgPh/46pVLkn35E9S8zkxoXS0qXImfH3cVxMP69yB+0hZMPSM/2FHtVJ6WiLSK7tFM2SVzq3T2vZyspOfOGEbZYS4= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=EwWUuC/z+4pmPlbJEnlhXLFoTcmHBBUCcBQplAaW7aR5BUmJDs/lDfDs0RlPaTOKJPKTax1P//2nBlH8CYaEBwMt38/1FDjxJG8yZ8qsuFdDYRHqkTgjTHe7nDlMVHNNeclsG9ZZNPy9sPQzToNNBnzcB9jdQpaECxsylQxmqbM= Yeah, I thought about that but you can't put a 16TB file in a sparse image (the image grows, even if the file contains only zeroes). Sparse files would be great but unfortunately HFS+ doesn't support them. On Fri, Feb 22, 2008 at 12:08 PM, Quinn <eskimo1(a)apple.com> wrote: > At 15:47 +0200 21/2/08, Valentin Slavov wrote: > >I need to develop a virtual block device which will be used for > >testing filesystem operations with files larger than 16TB or so. > > Is there a reason why you can't use a sparse disk image to do this? > > S+E > -- > Quinn "The Eskimo!" <http://www.apple.com/developer/> > Apple Developer Relations, Developer Technical Support, Core OS/Hardware > > _______________________________________________ > 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/vnslavov%40gmail.com > > This email sent to vnslavov(a)gmail.com > _______________________________________________ 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.… This email sent to site_archiver(a)lists.apple.com

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Re: hints for a "virtual disk" implementation
by Quinn 22 Feb '08

22 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com I need to develop a virtual block device which will be used for testing filesystem operations with files larger than 16TB or so. Is there a reason why you can't use a sparse disk image to do this? S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware _______________________________________________ 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.… At 15:47 +0200 21/2/08, Valentin Slavov wrote: This email sent to site_archiver(a)lists.apple.com

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Problem with nVidia GeForce 6800 Ultra on Leopard
by Apparao Mulpuri 22 Feb '08

22 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; bh=vKIrm7teXpNu2kcpkSC2pTvpg44CoY2BknOTcUamcRo=; b=V3WalJvuS+S4yMOrMiWxmh+CX05qv3dYF20ZtmQPmPHLdXkBLuGy4KjwiiF8zuMGNmfB85Y5hmpx072bt4BHbapQQOzqv665XjKQvHfDwHBfzwnTPg8q8lga+fQrvHenD92JDUtKmbIRVhjhMEWVagE8iH88Jw2/0Ks4iBenvc8= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=Zrhay+iSf37VvN00hiMBVQeGeSSOgAF0pQnnYirj1qsxUSIQWFzi4/fuRGpybiXg37/fOION6RZ87zwmYDE6HR3fzHwPZfJBhLF/YlJFwow/Wg4xr5ST8JAuiVRH/U/aPK1zxJPv0sYK88cKIkyQDfR3YGFIvNivzwnBKZj6wq4= Hello List, I have a KEXT which will interact with the Monitor firmware. My application, which will do following action upon launching: 1. Check the Monitor Connection 2. Find out graphics card type & Support of particular Graphics Card(presently working with nVidia 6800 Ultra) with Monitor. ---- Here, we are accessing graphics card virtual address space and setting and getting the values of SDA and SCL lines. Its working on Panther and Tiger, but giving problem(Graphics card has two ports, problem with the second port(port 1) only. I can able to set HIGH/Low on SDA/SCL lines on port 0) with Leopard OS. I tried it out by installing 10.5.2 also, but still that problem is there. I have tried by putting some time delay between setSDA and getSDA calls, but not succeded. Can any one provide best approach to trace out the issue? Thanks, - Apparao. _______________________________________________ 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.… This email sent to site_archiver(a)lists.apple.com

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Re: hints for a "virtual disk" implementation
by Rob McKeever 21 Feb '08

21 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com OK, I hope this doesn't sound too confusing... -Rob -- Rob McKeever, robm(a)apple.com Mass Storage Group, CPU Software Engineering Apple Computer On Feb 21, 2008, at 12:28 PM, Valentin Slavov wrote: Rob, Thanks, a piece of code would be useful. Can you explain briefly how the stack should look like? If I subclass IOBlockStorageDevice to which nub should I attach the newly created driver? Regards, V. Valentin, If I understand what you're trying to do, I don't think you need to recreate the entire stack. You should be able to subclass IOBlockStorageDevice and give it whatever backing store you want. -Rob -- Rob McKeever, robm(a)apple.com Mass Storage Group, CPU Software Engineering Apple Computer On Feb 21, 2008, at 5:47 AM, Valentin Slavov wrote: Hello Although the first solution seems more appropriate, I need to implement a whole driver stack for virtual devices (like the apple disk image drivers), but unfortunately I can't find sufficient documentation for this task. I'd like to know if there are more appropriate solutions and other hints that might be useful. _______________________________________________ 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.… 1) create a driver that subclasses from IOService, either directly or from another subclass. Give it a personality that allows it to attach itself either to IOResources or to your hardware, assuming you have some. Have that driver implement the backing store interface and any other calls you require (see below). 2) Create a second driver that subclasses from IOBlockStorageDevice and implements any required/desired methods. These methods should, in most cases, simply redirect to the first driver (see above) which will be attached as it's provider. 3) During the start routine (or some function called after start() has run) of the first driver, have it instantiate, init, attach and then register for sevice an instance of the second driver. At this stage, you will have a functioning block storage device with your own custom backing store. For an explanation as to why two drivers are required instead of just one, see the notes in the IOBlockStorageDevice and IOBlockStorageDriver header files. On Thu, Feb 21, 2008 at 10:02 PM, Rob McKeever <robm(a)apple.com> wrote: I can provide you with some code that shows how to do this if you need. I need to develop a virtual block device which will be used for testing filesystem operations with files larger than 16TB or so. Obviously all this space should be virtual (in a sparse image sense), however there should be some kind of backing store to hold the filesystem meta data. Since meta data is written at different places in the volume (hfs+ keeps a backup at the end of the device and so on, a backing store for certain "ranges" should be used. The backing stores should be configurable (I was thinking of providing bsd names and searching the I/O Kit registry for IOMedia objects, and attaching them to my driver). Another solution would be to implement the driver as a filter scheme but this is inflexible since backing store cannot be configured easily. Thanks in advance V. _______________________________________________ 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/robm %40apple.com This email sent to robm(a)apple.com This email sent to site_archiver(a)lists.apple.com

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Re: hints for a "virtual disk" implementation
by Valentin Slavov 21 Feb '08

21 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=0OKU+TNDTgJufdgiwYyh+6t6Omf6pzMzCOEVhDobMpM=; b=rEAByqCJ8kQlbQc4EX7lij8ieqpWJwA5059GLbpefRN7QKsvMHRONw+rlIFTMOBQNO0u3VEOe1xEsZWFDtX5EUOBS/nlMt2jnhRwGJA0UBvJADzKrtQA11eLOZuuszBeowefQkBKNa33S80zjdaxgoiXUyxC0DL7yvFfeBQ3bCM= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=QKdG9TQeOn8B1tkgd8F+grd22S2jPi8Q5ZczNZdCO3IFqmKVlOPYlxmaWBsOWmsPnTBgtangW3RbKoZRkJBO0rFS4O/cDCWHYBPhm0+oSII/oOyN4LFdbyCho4YwDNHcSohVBMYSCM7F4efA8d6kM3+E4s7hNaudJp71I724HL8= Rob, Thanks, a piece of code would be useful. Can you explain briefly how the stack should look like? If I subclass IOBlockStorageDevice to which nub should I attach the newly created driver? Regards, V. On Thu, Feb 21, 2008 at 10:02 PM, Rob McKeever <robm(a)apple.com> wrote: > Valentin, > > If I understand what you're trying to do, I don't think you need to > recreate the entire stack. You should be able to subclass > IOBlockStorageDevice and give it whatever backing store you want. > > I can provide you with some code that shows how to do this if you need. > > -Rob > > -- > Rob McKeever, robm(a)apple.com > Mass Storage Group, CPU Software Engineering > Apple Computer > > > > > > > On Feb 21, 2008, at 5:47 AM, Valentin Slavov wrote: > > > Hello > > > > I need to develop a virtual block device which will be used for > > testing filesystem operations with files larger than 16TB or so. > > Obviously all this space should be virtual (in a sparse image sense), > > however there should be some kind of backing store to hold the > > filesystem meta data. Since meta data is written at different places > > in the volume (hfs+ keeps a backup at the end of the device and so on, > > a backing store for certain "ranges" should be used. The backing > > stores should be configurable (I was thinking of providing bsd names > > and searching the I/O Kit registry for IOMedia objects, and attaching > > them to my driver). Another solution would be to implement the driver > > as a filter scheme but this is inflexible since backing store cannot > > be configured easily. > > > > Although the first solution seems more appropriate, I need to > > implement a whole driver stack for virtual devices (like the apple > > disk image drivers), but unfortunately I can't find sufficient > > documentation for this task. I'd like to know if there are more > > appropriate solutions and other hints that might be useful. > > > > Thanks in advance > > V. > > _______________________________________________ > > 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/robm%40apple.com > > > > This email sent to robm(a)apple.com > > _______________________________________________ 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.… This email sent to site_archiver(a)lists.apple.com

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Re: hints for a "virtual disk" implementation
by Rob McKeever 21 Feb '08

21 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Valentin, I can provide you with some code that shows how to do this if you need. -Rob -- Rob McKeever, robm(a)apple.com Mass Storage Group, CPU Software Engineering Apple Computer On Feb 21, 2008, at 5:47 AM, Valentin Slavov wrote: Hello I need to develop a virtual block device which will be used for testing filesystem operations with files larger than 16TB or so. Obviously all this space should be virtual (in a sparse image sense), however there should be some kind of backing store to hold the filesystem meta data. Since meta data is written at different places in the volume (hfs+ keeps a backup at the end of the device and so on, a backing store for certain "ranges" should be used. The backing stores should be configurable (I was thinking of providing bsd names and searching the I/O Kit registry for IOMedia objects, and attaching them to my driver). Another solution would be to implement the driver as a filter scheme but this is inflexible since backing store cannot be configured easily. Although the first solution seems more appropriate, I need to implement a whole driver stack for virtual devices (like the apple disk image drivers), but unfortunately I can't find sufficient documentation for this task. I'd like to know if there are more appropriate solutions and other hints that might be useful. Thanks in advance V. _______________________________________________ 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/robm%40apple.com _______________________________________________ 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.… If I understand what you're trying to do, I don't think you need to recreate the entire stack. You should be able to subclass IOBlockStorageDevice and give it whatever backing store you want. This email sent to robm(a)apple.com This email sent to site_archiver(a)lists.apple.com

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hints for a "virtual disk" implementation
by Valentin Slavov 21 Feb '08

21 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; bh=jq4QfbaO/IyHnw2cXVTohq+u4V27Uz79JV44Jffnoh0=; b=wND7L00SRNYhKxKdgGuYZC9kJBbThza/sEc+pAJa6AqKgoUrtTP+vYHKYhwwBJH5EeED4DIdVbjBXXhale3q+elfgg7933e89kTY7TKO5f5RMz1GRg1x1l7a2HjblQQ/XKOBGO9Cn9WUS3T2VnA3iQnjM4WjibSYP4aobdb138A= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=CHkdvETqKR0d0zgwMtysK2tY8N6HfxbOV4TQ66lEGb570n0CZsVu10gPOFKNwEHVWimd+QaGgGbeQrXfUuiRxfJiYRm4EzByqAw/vr5IhGXkEYC3wI2jTkistLuToGp368lBaUw2sS6m7/dEv+3Pfp8/gq9V/KMOeGOClOETB8Y= Hello I need to develop a virtual block device which will be used for testing filesystem operations with files larger than 16TB or so. Obviously all this space should be virtual (in a sparse image sense), however there should be some kind of backing store to hold the filesystem meta data. Since meta data is written at different places in the volume (hfs+ keeps a backup at the end of the device and so on, a backing store for certain "ranges" should be used. The backing stores should be configurable (I was thinking of providing bsd names and searching the I/O Kit registry for IOMedia objects, and attaching them to my driver). Another solution would be to implement the driver as a filter scheme but this is inflexible since backing store cannot be configured easily. Although the first solution seems more appropriate, I need to implement a whole driver stack for virtual devices (like the apple disk image drivers), but unfortunately I can't find sufficient documentation for this task. I'd like to know if there are more appropriate solutions and other hints that might be useful. Thanks in advance V. _______________________________________________ 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.… This email sent to site_archiver(a)lists.apple.com

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Re: Vnode documentation
by Quinn 21 Feb '08

21 Feb '08

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Alas, such documentation does not exist. <http://developer.apple.com/qa/qa2001/qa1242.html> Sorry that we don't have a better answer )-: S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware _______________________________________________ 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.… At 12:03 +0200 21/2/08, Sorin Negoita wrote: I was wondering what happened with the vnode online documentation from <http://developer.apple.com/documentation/Darwin/Reference/KPI_Reference/vno…>http://developer.apple.com/documentation/Darwin/Reference/KPI_Reference/vno…. Now it sais "Page not found" and it redirects me to the KPI Reference page, but the vnode related functions are missing. Does anynody know another page with vnode docs because I couldn't find one :( DTS Q&A 1242 "Developing For VFS" has a reasonably up-to-date summary of the state of VFS plug-in development on Mac OS X. If you have specific questions I'd be happy to help out (either here or on <http://lists.apple.com/mailman/listinfo/filesystem-dev>). This email sent to site_archiver(a)lists.apple.com

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