I am working on a small driver that uses a "make_request" function. Whenever my module receives a request from the upper layer, I am trying to copy it before sending it to the actual block device.
However, I don't see any funtion that lets me duplicate the BIO structure and its data (or a request).I have tried to increment the references to the original BIO structure, but once I modify its bi_bdev field and return nonzero (in order to be dispatched to the other device's driver) the upper layers seem to delete the data or the structure and when I try to process it a few milliseconds later I got a wonderful kernel error:
Apr 5 00:43:16 ajo kernel: kernel BUG at drivers/block/ll_rw_blk.c:2299!
Is there any way I can duplicate a BIO that is sent to me? Or at least prevent it from being deleter until I use it again? Any help would be appreciated. I have looked at the RAID source code but I can't find anything useful
Thanks
Pablo
PS: In 2.4 it was very easy.. that's why I'm a bit upset :)
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