April 2007 - Darwin-dev - lists.apple.com

Re: filepath-on-device to BSD-devpath-of-that-device
by Peter Bierman 25 Apr '07

25 Apr '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com How do I get a BSD device path string (eg: "/dev/rdisk3") that represents the path to the device that holds a file for which I have a path string (eg: "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt")? I can get the dev_t number of the device using stat(), but I'm not sure what to do with that number to get an actual path to the raw device. ... or maybe the stat() step is unnecessary altogether. -pmb _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… At 7:38 PM +0000 4/25/07, Chase wrote: So (to sum up)... How do I get a string like "/dev/rdisk3" starting with only the string "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt" ? statfs() takes a path to any file on a given filesystem. It returns f_mntonname, which is the mountpoint for the fs (/Volumes/foo) and f_mntfromname, which is the device node (/dev/disk0s3). If you need the unbuffered device, you'll have to add the 'r' yourself. (/dev/rdisk0s3) This email sent to site_archiver(a)lists.apple.com

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Re: filepath-on-device to BSD-devpath-of-that-device
by Chase 25 Apr '07

25 Apr '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com > I'm no expert, but I would have thought getfsstat() and friends. Thanks. That worked great! (code snippet included for future archive searchers) #include <stdio.h> #include <sys/param.h> #include <sys/mount.h> int main() { struct statfs the_stats; char * the_file = "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt"; statfs(the_file, &the_stats); printf("%s\n", the_stats.f_mntfromname); return 0; }; - Chase _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: filepath-on-device to BSD-devpath-of-that-device
by Mo McRoberts 25 Apr '07

25 Apr '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 25-Apr-2007, at 20:38, Chase wrote: ... or maybe the stat() step is unnecessary altogether. I'm no expert, but I would have thought getfsstat() and friends. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… How do I get a BSD device path string (eg: "/dev/rdisk3") that represents the path to the device that holds a file for which I have a path string (eg: "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt")? I can get the dev_t number of the device using stat(), but I'm not sure what to do with that number to get an actual path to the raw device. So (to sum up)... How do I get a string like "/dev/rdisk3" starting with only the string "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt" ? This email sent to site_archiver(a)lists.apple.com

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filepath-on-device to BSD-devpath-of-that-device
by Chase 25 Apr '07

25 Apr '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com How do I get a BSD device path string (eg: "/dev/rdisk3") that represents the path to the device that holds a file for which I have a path string (eg: "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt")? I can get the dev_t number of the device using stat(), but I'm not sure what to do with that number to get an actual path to the raw device. ... or maybe the stat() step is unnecessary altogether. So (to sum up)... How do I get a string like "/dev/rdisk3" starting with only the string "/Volumes/SOME_DATA_CD/A_SUB_FOLDER/THE_FILE.txt" ? Thanks. - Chase _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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RE: Memory allocation problem in kernel space.....
by Matthew Xavier Mora 25 Apr '07

25 Apr '07

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Re: Memory allocation problem in kernel space.....
by Garth Cummings 25 Apr '07

25 Apr '07

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RE: Memory allocation problem in kernel space.....
by Gaurav Kumar 25 Apr '07

25 Apr '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AceFt2vzp5IL0bmJTAur/ZzsxqXhBgBU58nw Hi Shawn, When I use IOMallocAligned the time for execution increases 200%. For eg : A 10 gb disk takes 13 min to complete using new(). Same disk when allocated using IOMalloc() takes 26 min approx. This is the case when I replace medium and small memory allocation using new() by IOMalloc. If I Use IOMallocPageable() or IOMallocAligned() for above case it works fine i.e. time taken is same for new() and later functions. But problem starts when I allocate Huge memory for my pointer using IOMallocPageable() or IOMallocAligned(). Allocation does not fails but when my process uses it after some time system crashes. But when I Use new() nothing fails and it works fine. Problem with new is, it fails to allocate for more than 4 instances of 10 GB disk. My requirement is to run 10 instances of 10 GB. UInt32 * ptr = new UInt32(1024*80); // Huge memory no failure case but fails from 4th instances. Or UInt32 * ptr = (UInt32 *)IOMallocPageable(1024*80, 256); // Huge memory it allocates but later on while using this mem system crashes. Not able to complete single instance. But if I use new() for Huge memory and use IOMallocPageable() for rest of my mem allocations it works fine for a instance. But I want my huge memory to be handled. Please suggest and if I am wrong anywhere please give pointers. Thanks Gaurav On Apr 22, 2007, at 10:46 PM, Gaurav Kumar wrote: > I am using IOkiit framework for my driver in cpp and Mac OS 10.4.8. > > IOmalloc and malloc not able to allocate memory for my requirement. > Can you better explain why IOMalloc or IOMallocPageable (and friends) are not able to meet your requirements? Anyway review... <http://developer.apple.com/documentation/Darwin/Conceptual/ KernelProgramming/vm/chapter_7_section_9.html> -Shawn _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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RE: Memory allocation problem in kernel space.....
by Gaurav Kumar 25 Apr '07

25 Apr '07

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Thread-index: AceFzPQwXlx0bKaNTP+nNkYvr7SGaQBLD5Ww _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: kext Kernel Debugging
by Alexander von Below 24 Apr '07

24 Apr '07

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Re: kext Kernel Debugging
by Garth Cummings 24 Apr '07

24 Apr '07

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