[Bug 2092168] Re: rapiddisk-dkms FTBS in Noble with linux-6.11-hwe kernel

[Massimiliano Pellizzer]

** Changed in: rapiddisk (Ubuntu)
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/2092168

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

Status in rapiddisk package in Ubuntu:
  Invalid
Status in rapiddisk source package in Noble:
  In Progress

Bug description:
  [ Impact ]

  rapiddisk-dkms does not compile from source in Noble with kernel 6.11:

  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c: In function ‘dm_io_async_bvec’:
  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c:198:16: error: too few arguments to function ‘dm_io’
    198 |         return dm_io(&iorq, num_regions, where, NULL);
        |                ^~~~~
  In file included from /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c:46:
  ./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/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c: In function ‘cache_ctr’:
  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c:1022:59: error: ‘struct block_device’ has no member named ‘bd_inode’
   1022 |                 dmc->size = to_sector(dmc->cache_dev->bdev->bd_inode->i_size);
        |                                                           ^~
  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c:1058:50: error: ‘struct block_device’ has no member named ‘bd_inode’
   1058 |         dev_size = to_sector(dmc->cache_dev->bdev->bd_inode->i_size);
        |                                                  ^~

  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk.c: In function ‘attach_device’:
  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk.c:809:61: error: macro "blk_alloc_disk" requires 2 arguments, but only 1 given
    809 |         disk = rdsk->rdsk_disk = blk_alloc_disk(NUMA_NO_NODE);
        |                                                             ^
  In file included from /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk.c:30:
  ./include/linux/blkdev.h:821: note: macro "blk_alloc_disk" defined here
    821 | #define blk_alloc_disk(lim, node_id)                                    \
        |
        
  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk.c:809:34: error: ‘blk_alloc_disk’ undeclared (first use in this function)
    809 |         disk = rdsk->rdsk_disk = blk_alloc_disk(NUMA_NO_NODE);
        |                                  ^~~~~~~~~~~~~~
  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk.c:809:34: note: each undeclared identifier is reported only once for each function it appears in

  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk.c:816:61: error: macro "blk_alloc_disk" requires 2 arguments, but only 1 given
    816 |         disk = rdsk->rdsk_disk = blk_alloc_disk(NUMA_NO_NODE);
        |                                                             ^
  ./include/linux/blkdev.h:821: note: macro "blk_alloc_disk" defined here
    821 | #define blk_alloc_disk(lim, node_id)                                    \
        | 

  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c: In function ‘dm_io_async_bvec’:
  /var/lib/dkms/rapiddisk-dkms/9.1.0/build/rapiddisk-cache.c:199:1: error: control reaches end of non-void function [-Werror=return-type]
    199 | }
        | ^

  [ 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 rapiddisk-dkms:

  $ sudo apt install rapiddisk-dkms

  Load the module:

  $ sudo modprobe rapiddisk
  $ sudo modprobe rapiddisk-cache

  The same procedure should be repeated on linux-6.8 to test for
  possible regressions.

  [ Fix ]

  Backport the package from Oracular to properly support the new 6.11
  kernel ABI.

  [ Regression potential ]

  We may experience regressions in systems that are using rapiddisk with
  a kernel >= 6.8.

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