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Linux 6.10: rework queue limits setup

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Linux has started moving to a model where instead of applying block
queue limits through individual modification functions, a complete
limits structure is built up and applied atomically, either when the
block device or open, or some time afterwards. As of 6.10 this
transition appears only partly completed.

This commit matches that model within OpenZFS in a way that should work
for past and future kernels. We set up a queue limits structure with any
limits that have had their modification functions removed. For newer
kernels that can have limits applied at block device open
(HAVE_BLK_ALLOC_DISK_2ARG), we have a conversion function to turn the
OpenZFS queue limits structure into Linux's queue_limits structure,
which can then be passed in. For older kernels, we provide an
application function that just calls the old functions for each limit in
the structure.

Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Rob Norris
2024-05-27 21:32:07 -04:00
committed by Tony Hutter
parent 4ee66cdf4e
commit b409892ae5
2 changed files with 118 additions and 72 deletions
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config/kernel-blk-queue.m4
+2 -2
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@@ -332,7 +332,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS], [
ZFS_LINUX_TEST_RESULT([blk_queue_max_hw_sectors], [
AC_MSG_RESULT(yes)
],[
ZFS_LINUX_TEST_ERROR([blk_queue_max_hw_sectors])
AC_MSG_RESULT(no)
])
])
@@ -355,7 +355,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS], [
ZFS_LINUX_TEST_RESULT([blk_queue_max_segments], [
AC_MSG_RESULT(yes)
], [
ZFS_LINUX_TEST_ERROR([blk_queue_max_segments])
AC_MSG_RESULT(no)
])
])