Issue with bcache on top of RAID10

[Brad Campbell <brad@xxxxxxxxxxxxxxx>]

I've just fired up my test server with the latest git code, and I'm seeing this in the logs

Apr 22 18:54:29 test kernel: [  169.015498] md/raid10:md10: make_request bug: can't convert block 
across chunks or bigger than 512k 260098047 4
Apr 22 18:54:30 test kernel: [  170.015440] md/raid10:md10: make_request bug: can't convert block 
across chunks or bigger than 512k 260098047 4
Apr 22 18:54:31 test kernel: [  171.015455] md/raid10:md10: make_request bug: can't convert block 
across chunks or bigger than 512k 260098047 4
Apr 22 18:54:32 test kernel: [  172.015486] md/raid10:md10: make_request bug: can't convert block 
across chunks or bigger than 512k 260098047 4

It's triggering this code in /device/md/raid10.c in make_request()

                /* Sanity check -- queue functions should prevent this happening */
                if (bio->bi_vcnt != 1 ||
                    bio->bi_idx != 0)
                        goto bad_map;

As I didn't see this with plain ext4 on the md device, but I do see it with ext4 on bcache0 on the 
md device I can only assume something funky is happening in bcache.

Happy to do anything to help.

Regards,
Brad
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