Dne 24.6.2013 09:19, monica g napsal(a):
Hi, I wrote a basic device mapper driver which caches reads. I gave dm msg prefix as below #define DM_MSG_PREFIX "cacheread". When i try to create a device mapper node using the below command echo "0 `blockdev --getsize /dev/sda2` cacheread /dev/sda2 0" | dmsetup create cacheread the system hangs.I am not getting any error messages.
Why not looking into a basic linear driver - linux/drivers/md/dm-stripe.c and start updating this driver for your needs. Kernel device driver development is not easily debugable from userspace. Also you might be interested to look at dm-cache driver available from 3.9 kernel and which does much more advanced caching of reads as well as writes.... Regards Zdenek
When i try to create a device mapper node for linear target(this target is already present with the device mapper code) using below command echo "0 `blockdev --getsize /dev/sda2` linear /dev/sda2 0" | dmsetup create linear it succeeds and creates device node linear in /dev/mapper directory. I am stuck with this issue and not able to proceed furthur. Please let me know if you have any suggestions. Any help is truely appreciated. Thanks in advance. Regards, Monica -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
-- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
