[Bug 2091313] Re: dm-writeboost-dkms FTBS in Noble with linux-6.11-hwe kernel

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https://bugs.launchpad.net/bugs/2091313

Title:
  dm-writeboost-dkms FTBS in Noble with linux-6.11-hwe kernel

Status in dm-writeboost package in Ubuntu:
  In Progress
Status in dm-writeboost source package in Noble:
  In Progress

Bug description:
  [ Impact ]

  The DKMS does not compile from source in Noble with kernel 6.11:

  /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c: In function ‘wb_io_fn’:
  /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c:56:19: error: too few arguments to function ‘dm_io’
     56 |         io->err = dm_io(io->io_req, io->num_regions, io->regions, &io->err_bits);
        |                   ^~~~~
  In file included from /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost.h:37,
                   from /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c:23:
  ./include/linux/dm-io.h:82:5: note: declared here
     82 | int dm_io(struct dm_io_request *io_req, unsigned int num_regions,
        |     ^~~~~
  /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c: In function ‘wb_io_internal’:
  /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c:82:23: error: too few arguments to function ‘dm_io’
     82 |                 err = dm_io(io_req, num_regions, regions, err_bits);
        |                       ^~~~~
  ./include/linux/dm-io.h:82:5: note: declared here
     82 | int dm_io(struct dm_io_request *io_req, unsigned int num_regions,
        |     ^~~~~

  /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c: In function ‘dm_devsize’:
  /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c:108:37: error: ‘struct block_device’ has no member named ‘bd_inode’
    108 |         return i_size_read(dev->bdev->bd_inode) >> 9;
        |                                     ^~
  /var/lib/dkms/dm-writeboost/2.2.16/build/dm-writeboost-target.c:109:1: error: control reaches end of non-void function [-Werror=return-type]
    109 | }
        | ^

  [ Test case ]

  Install the latest linux-6.11 kernel on Noble:

  $ sudo add-apt-repository ppa:canonical-kernel-team/ppa
  $ sudo apt update
  $ sudo apt install linux-image-6.11.0-12-generic \
                     linux-modules-6.11.0-12-generic \
                     linux-modules-extra-6.11.0-12-generic \
                     linux-headers-6.11.0-12-generic

  Install dm-writeboost-dkms:

  $ sudo apt install dm-writeboost-dkms

  Load the module:

  $ sudo modprobe dm-writeboost

  [ Fix ]

  Patch the code to properly support the new linux 6.11 ABI.

  [Regression potential]

  System using the dm-writeboost-dkms may experience regressions,
  especially with a kernel >= 6.11, affecting storage performance.

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