[Bug 2092053] [NEW] openafs-modules-dkms FTBS in Noble with linux-6.11-hwe kernel

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[ Impact ]

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

/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_alloc.c: In function ‘linux_alloc_init’:
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_alloc.c:212:37: error: ‘vmalloc’ undeclared (first use in this function); did you mean ‘mm_alloc’?
  212 |                             (void *)vmalloc, local_free);
      |                                     ^~~~~~~
      |                                     mm_alloc

/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_module.c:25:10: fatal error: asm/ia32_unistd.h: No such file or directory
   25 | #include <asm/ia32_unistd.h>
      |          ^~~~~~~~~~~~~~~~~~~

/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c: In function ‘afs_linux_lock’:
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:732:23: error: ‘struct file_lock’ has no member named ‘fl_type’
  732 |     flock.l_type = flp->fl_type;
      |                       ^~
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:733:24: error: ‘struct file_lock’ has no member named ‘fl_pid’; did you mean ‘fl_end’?
  733 |     flock.l_pid = flp->fl_pid;
      |                        ^~~~~~
      |                        fl_end
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:755:26: error: ‘struct file_lock’ has no member named ‘fl_type’
  755 |     if ((code == 0 || flp->fl_type == F_UNLCK) &&
      |                          ^~
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:758:24: error: ‘struct file_lock’ has no member named ‘fl_type’
  758 |         if (code && flp->fl_type != F_UNLCK) {
      |                        ^~
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:773:16: error: ‘struct file_lock’ has no member named ‘fl_type’
  773 |         if (flp->fl_type != F_UNLCK) {
      |                ^~
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:780:8: error: ‘struct file_lock’ has no member named ‘fl_type’
  780 |     flp->fl_type = flock.l_type;
      |        ^~
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:781:10: error: ‘struct file_lock’ has no member named ‘fl_pid’; did you mean ‘fl_end’?
  781 |     flp->fl_pid = flock.l_pid;
      |          ^~~~~~
      |          fl_end

/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c: In function ‘afs_linux_read_cache’:
/var/lib/dkms/openafs/1.8.10/build/src/libafs/MODLOAD-6.11.0-12-generic-SP/osi_vnodeops.c:2381:27: error: implicit declaration of function ‘page_cache_alloc’; did you mean ‘kmem_cache_alloc’? [-Werror=implicit-function-declaration]
 2381 |                 newpage = page_cache_alloc(cachemapping);
      |                           ^~~~~~~~~~~~~~~~
      |                           kmem_cache_alloc

[ 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 openafs-modules-dkms:

$ sudo apt install openafs-modules-dkms

Load the module:

$ sudo modprobe openafs

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

[ Fix ]

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

[ Regression potential ]

We may experience regressions in systems that are using openafs with the
new 6.11 kernel.

** Affects: openafs (Ubuntu)
     Importance: Undecided
     Assignee: Massimiliano Pellizzer (mpellizzer)
         Status: In Progress

** Affects: openafs (Ubuntu Noble)
     Importance: Undecided
     Assignee: Massimiliano Pellizzer (mpellizzer)
         Status: In Progress


** Tags: patch
-- 
openafs-modules-dkms FTBS in Noble with linux-6.11-hwe kernel
https://bugs.launchpad.net/bugs/2092053
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