Hello Alvin, On Mon, Jun 23, 2014 at 10:39 PM, Alvin Abitria <abitria.alvin@xxxxxxxxx> wrote: > Hello, > > I'm developing a block driver using the make_request method, effectively > bypassing existing scsi or request stack in block layer. So that means im > directly working with bios. As prescribed in linux documentation and from > referring to similar drivers in kernel, you close a session with a bio with > the bio_endio function. So it means you are just passing on the bios without the request structure if I'm correct? I don't know how you are handling blk_finish_plug without having request or request queue, I maybe wrong in understanding how you are handling it. > > I usually invoke bio_endio during successful I/O completion, meaning with an > error code of zero. But there are cases that this is not fulfilled or there > are error cases. My question is, what are the valid error codes that can be > used with it? My initial impression is that other than zero as error code, -EIO is the one that you should use I think, > bio_endio will fail. I've read somewhere that -EBUSY is not recognized, and > I tried -EIO but my driver crashed. I got a panic in some dio_xxx function > leading from bio_endio(bio,-EIO). I would like to block subsequent bios sent If it's okay for you to post the error then can you do that? I was seeing the code for dio_end_io but it would be good if you can post the exact crash backtrace if you've got that. > to me after reaching my queue depth and with no tags left, and so I want to > use bio_endio with an error code. If you have a request queue then you could call blk_stop_queue and blk_start_queue but I don't know if this is relevant to your case. > > What are those error codes, and will they work for my intended function? > Thanks! -EIO should work, but first let's find out why you got the crash. > > > > Sent from Samsung Mobile > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- ---P.K.S _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
