Re: menuconfig: can not select scsi device support
You can find out dependencies for needed options by pressing '/' (to search) and then typing your option. 06.03.2015, 09:48, robert rottermann rob...@redcor.ch: Hi there, I am working trough a book on embeded systems (embeded linux by J.Quade) There in the chapter about building a new kernel is suggested to select Device Drivers- SCSI device support - a number of subslections. Now, when I start menuconfig I find Device Drivers- SCSI device support, but selecting it produces an empty page. Why is that so? Do I have to add other elements to the configuration process? I am using linux-3.19. Thanks robert ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
question scheduler
Hello all continue to study the scheduler is O(1 ) there was one difficulty with the string 2 on 3, in that these blocking occurs after lines ? 1 rcu_read_lock(); 2 pcred = __task_cred(p); 3 match = (cred-euid == pcred-euid || cred-euid == pcread-uid); 4 rcu_read_unlock(); I ask because in the comments there is not described . Thank. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: How to check if a file is a present in a directory(directly/indirectly)
Maybe it helps: http://stackoverflow.com/questions/8347553/how-do-i-open-a-directory-at-kernel-level-using-the-file-descriptor-for-that-dir 2015-03-06 12:08 GMT-03:00 noyb noybee afzal...@gmail.com: I am building a LKM in which I need to check whether a file is inside a particular directory(directly or inside sub-directories). Is there a function for this? Do I need to use the lookup function in inode_operations for this or is there a better method? Regards, winged_elite ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- Gabriel Duarte Linux User #471185 Rio de Janeiro / RJ http://genericdev.wordpress.com/ ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: How to check if a file is a present in a directory(directly/indirectly)
On Fri, 06 Mar 2015 20:38:46 +0530, noyb noybee said: I am building a LKM in which I need to check whether a file is inside a particular directory(directly or inside sub-directories). Is there a function for this? Do I need to use the lookup function in inode_operations for this or is there a better method? Inside subdirectories is an intractable problem, even from userspace. You basically need to walk *all* the inodes: find /mounpoint -inum file_inode_number | grep /mountpoint/directory/to/check If the filesystem is large, that can take a while. Also, a file can be in more than one subdirectory at once: [~] cd /tmp [/tmp] mkdir z9 [/tmp] cd z9 [/tmp/z9] mkdir a b [/tmp/z9] mkdir a/c [/tmp/z9] touch a/c/d [/tmp/z9] ln a/c/d a/first [/tmp/z9] ln a/c/d b/second [/tmp/z9] ln a/c/d third [/tmp/z9] ls -lR /tmp/z9] ls -liR .: total 0 62326 drwxr-xr-x. 3 valdis valdis 80 Mar 6 12:13 a 62327 drwxr-xr-x. 2 valdis valdis 60 Mar 6 12:13 b 62388 -rw-r--r--. 4 valdis valdis 0 Mar 6 12:13 third ./a: total 0 63471 drwxr-xr-x. 2 valdis valdis 60 Mar 6 12:13 c 62388 -rw-r--r--. 4 valdis valdis 0 Mar 6 12:13 first ./a/c: total 0 62388 -rw-r--r--. 4 valdis valdis 0 Mar 6 12:13 d ./b: total 0 62388 -rw-r--r--. 4 valdis valdis 0 Mar 6 12:13 second So which directory is it under? And can this sort of stunt be exploited with a race condition on a large filesystem? (Hint -there's a *reason* that SELinux and Smack both use file labels instead of pathnames...) I think you need to stop and think about what you're *actually* trying to accomplish here. I suspect that what you *think* you are checking isn't what you should *actually* be checking pgpvWCj_AOjak.pgp Description: PGP signature ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: menuconfig: can not select scsi device support
On Fri, 2015-03-06 at 07:44 +0100, robert rottermann wrote: Now, when I start menuconfig I find Device Drivers- SCSI device support, but selecting it produces an empty page. Why is that so? Do I have to add other elements to the configuration process? My guess is you're missing BLOCK. If BLOCK is not set see you'll see SCSI device support in the Device Drivers page of make menuconfig. And if BLOCK is set you'll see SCSI device support --- (Yes, the difference is rather subtle.) Then you should see a non-empty page if you select that: [ ] RAID Transport Class (NEW) [ ] SCSI device support (NEW) (And, yes, there are two entries labeled SCSI device support.) You can (probably) set BLOCK in the main menu under [ ] Enable the block layer Hope this helps, Paul Bolle ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Mouse driver
Hi,I want to write mouse driver for linux ( usb mouse). I am reading Linux device driver and Linux kernel development. But i don't how to start writing the driver. So,Please help. Best regards, Ronit. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Mouse driver
On 2015-03-06 11:36 PM, Ronit Halder wrote: This is my semester project and Thanks. Does it have to be a input driver? If you really want to impress your teacher and get a better mark,try writing a basic network or usb driver. Nick On Sat, Mar 7, 2015 at 10:04 AM, nick xerofo...@gmail.com wrote: Ronit, What are your reasons for writing this driver? In addition if you have the kernel tree lying around look under drivers/input/mouse for mouse drivers that are in production to help you understand how to write one better. Good Luck, Nick On 2015-03-06 11:27 PM, Ronit Halder wrote: Hi,I want to write mouse driver for linux ( usb mouse). I am reading Linux device driver and Linux kernel development. But i don't how to start writing the driver. So,Please help. Best regards, Ronit. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
