i want to know
How to execute a process on multiple processor in linux

actually i have a big process and a multi processor machine
for this i tried affinity functions like
* sched_setaffirmity
* sched_getaffirmity
but facing some problem
can anyone help me regarding this

im new to linux programming
can anyone help me regarding sector wise read write block from hard disk
help me regarding this

hello friends
im trying to add some encryption/decryption features in existing hdd driver
for this im unable to locate the location where i have to make changes
kindly help me regarding this

details as follows
--- understand the flow for read/write request (PRACTICALLY IN CODE)
--- in which file i have to make changes

Thankyou :)