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Linux 5.16: bio_set_dev is no longer a helper macro

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This change adds a confiugre check to determine if bio_set_dev is a
helper macro or not. If not, then the attempt to override its internal
call to bio_associate_blkg(), with a macro definition to our own
version, is no longer possible, as the compiler won't use it when
compiling the new inline function replacement implemented in the header.
This change also creates a new vdev_bio_set_dev() function that performs
the same work, and also performs the work implemented in
vdev_bio_associate_blkg(), as it is the only thing calling that function
in our code. Our custom vdev_bio_associate_blkg() is now only compiled
if the bio_set_dev() is a macro in the Linux headers.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #12819
This commit is contained in:
Coleman Kane
2021-12-03 21:45:28 -05:00
committed by Tony Hutter
parent 9519fe1ff8
commit ea61e07413
2 changed files with 52 additions and 0 deletions
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config/kernel-bio.m4
+28
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@@ -191,6 +191,24 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_SET_DEV], [
], [], [ZFS_META_LICENSE])
])
dnl #
dnl # Linux 5.16 API
dnl #
dnl # bio_set_dev is no longer a helper macro and is now an inline function,
dnl # meaning that the function it calls internally can no longer be overridden
dnl # by our code
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_SET_DEV_MACRO], [
ZFS_LINUX_TEST_SRC([bio_set_dev_macro], [
#include <linux/bio.h>
#include <linux/fs.h>
],[
#ifndef bio_set_dev
#error Not a macro
#endif
], [], [ZFS_META_LICENSE])
])
AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV], [
AC_MSG_CHECKING([whether bio_set_dev() is available])
ZFS_LINUX_TEST_RESULT([bio_set_dev], [
@@ -205,6 +223,15 @@ AC_DEFUN([ZFS_AC_KERNEL_BIO_SET_DEV], [
AC_DEFINE(HAVE_BIO_SET_DEV_GPL_ONLY, 1,
[bio_set_dev() GPL-only])
])
AC_MSG_CHECKING([whether bio_set_dev() is a macro])
ZFS_LINUX_TEST_RESULT([bio_set_dev_macro], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BIO_SET_DEV_MACRO, 1,
[bio_set_dev() is a macro])
],[
AC_MSG_RESULT(no)
])
],[
AC_MSG_RESULT(no)
])
@@ -434,6 +461,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO], [
ZFS_AC_KERNEL_SRC_BLKG_TRYGET
ZFS_AC_KERNEL_SRC_BIO_BDEV_DISK
ZFS_AC_KERNEL_SRC_BDEV_SUBMIT_BIO_RETURNS_VOID
ZFS_AC_KERNEL_SRC_BIO_SET_DEV_MACRO
])
AC_DEFUN([ZFS_AC_KERNEL_BIO], [