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Linux 6.11: enable queue flush through queue limits

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In 6.11 struct queue_limits gains a 'features' field, where, among other
things, flush and write-cache are enabled. Detect it and use it.

Along the way, the blk_queue_set_write_cache() compat wrapper gets a
little cleanup. Since both flags are alway set together, its now a
single bool. Also the very very ancient version that sets q->flush_flags
directly couldn't actually turn it off, so I've fixed that. Not that we
use it, but still.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #16400
This commit is contained in:
Rob Norris
2024-07-30 21:40:35 +10:00
committed by Brian Behlendorf
parent 767b37019f
commit e95b732e49
3 changed files with 50 additions and 14 deletions
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config/kernel-make-request-fn.m4
+21
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@@ -58,6 +58,13 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN], [
disk = blk_alloc_disk(lim, NUMA_NO_NODE);
])
ZFS_LINUX_TEST_SRC([blkdev_queue_limits_features], [
#include <linux/blkdev.h>
],[
struct queue_limits *lim = NULL;
lim->features = 0;
])
ZFS_LINUX_TEST_SRC([blk_cleanup_disk], [
#include <linux/blkdev.h>
],[
@@ -114,6 +121,20 @@ AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_BLK_ALLOC_DISK_2ARG], 1, [blk_alloc_disk() exists and takes 2 args])
dnl #
dnl # Linux 6.11 API change:
dnl # struct queue_limits gains a 'features' field,
dnl # used to set flushing options
dnl #
AC_MSG_CHECKING([whether struct queue_limits has a features field])
ZFS_LINUX_TEST_RESULT([blkdev_queue_limits_features], [
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_BLKDEV_QUEUE_LIMITS_FEATURES], 1,
[struct queue_limits has a features field])
], [
AC_MSG_RESULT(no)
])
dnl #
dnl # 5.20 API change,
dnl # Removed blk_cleanup_disk(), put_disk() should be used.