2012/10/17 Dmitry Filippov <filippovd20@xxxxxxxxx>: > Hi, > > Recently i've started with development of kernel module, which uses > existing block devices/partitions as backend and represents itself as > scsi disk. > > i've found good start point - scsi_debug module which is in official > kernel tree under drivers/scsi/ > i suppose you are aware about this module. So in fact it is low level > scsi adapter which represents itself as scsi disk /dev/sd? on the > system and uses RAM as backend storage. actually what i need! It's a adapter, it use RAM represent as scsi disk snip.. > > the problem is with response to READ. > scsi_debug just uses sg_copy_from_buffer from RAM storage - where data > is always uptodate. > but in my case i need to read data from block device by submit_bio > first and only after this can use buffer updated to pass it to > sg_copy_from_buffer... I still don't have idea how to accomplish this. > you just need to pass the request to block device and can scsi_done when ready, I'm not sure submit_io block or not through. Jack > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
