> driver. I could not understand why the "sbd_request " is called even though
> i have given only one read call from user space file.

Block device I/O transfer is done in blocks.

> And also in the driver, in the function sbd_request() how does the driver
> get the parameters like sector, current_nr_sectors and buffer.

VFS <-> SCSI <-> Block device?

> i could move
> furhter fastly.

Fastly? IMHO, learning kernel development involves lot of patience.

SK

Is it necessary to use kernel_thread() in block drivers. In drivers/block loop.c i could see kernel_thread() being used but in floopy.c it is not used. When is this kernel_thread() function is supposed to be used ? In the sbd_device also the kernel_thread() is not used.

Anyone please kindly clarify my doubts.

Thanks in Advance

-Rahul