dm-writeboost-dkms fails to build with linux 6.1 in lunar

[Andrea Righi]

[Impact]

dm-writeboost-dkms fails to build with linux 6.1 in lunar with the following error(s):

/home/righiandr/src/dm-writeboost/src/dm-writeboost.h:506:46: error: ‘struct dm_io_request’ has no member named ‘bi_op’; did you mean ‘bi_opf’?
  506 | #define req_is_write(req) op_is_write((req)->bi_op)
      | ^~~~~
./include/linux/printk.h:429:33: note: in expansion of macro ‘req_is_write’

[Test case]

$ sudo apt install dm-writeboost-dkms

[Fix]

With kernel upstream commit 581075e4f647 ("dm/core: Reduce the size of struct dm_io_request") bi_op and bi_op_flags in struct dm_io_request have been merged together into the same attribute bi_opf, so we need to support this ABI change.

[Regression potential]

The proposed fix is only affecting kernels >= 6.0, so we may experience I/O-related regressions in recent kernels that are using dm-writeboost.

[Andrea Righi (arighi)]

debdiff in attach allows to use dm-writeboost with linux >= 6.0.

[Timo Aaltonen (tjaalton)]

looks like a newer version got synced from Debian which builds