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Linux 5.14 compat: blk_alloc_disk()

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In Linux 5.14, blk_alloc_queue is no longer exported, and its usage
has been superseded by blk_alloc_disk, which returns a gendisk struct
from which we can still retrieve the struct request_queue* that is
needed in the one place where it is used. This also replaces the call
to alloc_disk(minors), and minors is now set via struct member
assignment.

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Coleman Kane <ckane@colemankane.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12362 
Closes #12409
This commit is contained in:
Brian Behlendorf
2021-07-23 15:28:03 -07:00
committed by GitHub
parent 14b43fbd9c
commit 1b06b03a7b
2 changed files with 56 additions and 11 deletions
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config/kernel-make-request-fn.m4
+20
View File
@@ -42,6 +42,13 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN], [
struct block_device_operations o;
o.submit_bio = NULL;
])
ZFS_LINUX_TEST_SRC([blk_alloc_disk], [
#include <linux/blkdev.h>
],[
struct gendisk *disk __attribute__ ((unused));
disk = blk_alloc_disk(NUMA_NO_NODE);
])
])
AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
@@ -56,6 +63,19 @@ AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
AC_DEFINE(HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS, 1,
[submit_bio is member of struct block_device_operations])
dnl #
dnl # Linux 5.14 API Change:
dnl # blk_alloc_queue() + alloc_disk() combo replaced by
dnl # a single call to blk_alloc_disk().
dnl #
AC_MSG_CHECKING([whether blk_alloc_disk() exists])
ZFS_LINUX_TEST_RESULT([blk_alloc_disk], [
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_BLK_ALLOC_DISK], 1, [blk_alloc_disk() exists])
], [
AC_MSG_RESULT(no)
])
],[
AC_MSG_RESULT(no)