6152014d1a
The CentOS stream 4.18.0-257 kernel appears to have backported the Linux 5.9 change to make_request_fn and the associated API. To maintain weak modules compatibility the original symbol was retained and the new interface blk_alloc_queue_rh() was added. Unfortunately, blk_alloc_queue() was replaced in the blkdev.h header by blk_alloc_queue_bh() so there doesn't seem to be a way to build new kmods against the old interfces. Even though they appear to still be available for weak module binding. To accommodate this a configure check is added for the new _rh() variant of the function and used if available. If compatibility code gets added to the kernel for the original blk_alloc_queue() interface this should be fine. OpenZFS will simply continue to prefer the new interface and only fallback to blk_alloc_queue() when blk_alloc_queue_rh() isn't available. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #11374
141 lines
4.3 KiB
Plaintext
141 lines
4.3 KiB
Plaintext
dnl #
|
|
dnl # Check for make_request_fn interface.
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_SRC_MAKE_REQUEST_FN], [
|
|
ZFS_LINUX_TEST_SRC([make_request_fn_void], [
|
|
#include <linux/blkdev.h>
|
|
void make_request(struct request_queue *q,
|
|
struct bio *bio) { return; }
|
|
],[
|
|
blk_queue_make_request(NULL, &make_request);
|
|
])
|
|
|
|
ZFS_LINUX_TEST_SRC([make_request_fn_blk_qc_t], [
|
|
#include <linux/blkdev.h>
|
|
blk_qc_t make_request(struct request_queue *q,
|
|
struct bio *bio) { return (BLK_QC_T_NONE); }
|
|
],[
|
|
blk_queue_make_request(NULL, &make_request);
|
|
])
|
|
|
|
ZFS_LINUX_TEST_SRC([blk_alloc_queue_request_fn], [
|
|
#include <linux/blkdev.h>
|
|
blk_qc_t make_request(struct request_queue *q,
|
|
struct bio *bio) { return (BLK_QC_T_NONE); }
|
|
],[
|
|
struct request_queue *q __attribute__ ((unused));
|
|
q = blk_alloc_queue(make_request, NUMA_NO_NODE);
|
|
])
|
|
|
|
ZFS_LINUX_TEST_SRC([blk_alloc_queue_request_fn_rh], [
|
|
#include <linux/blkdev.h>
|
|
blk_qc_t make_request(struct request_queue *q,
|
|
struct bio *bio) { return (BLK_QC_T_NONE); }
|
|
],[
|
|
struct request_queue *q __attribute__ ((unused));
|
|
q = blk_alloc_queue_rh(make_request, NUMA_NO_NODE);
|
|
])
|
|
|
|
ZFS_LINUX_TEST_SRC([block_device_operations_submit_bio], [
|
|
#include <linux/blkdev.h>
|
|
],[
|
|
struct block_device_operations o;
|
|
o.submit_bio = NULL;
|
|
])
|
|
])
|
|
|
|
AC_DEFUN([ZFS_AC_KERNEL_MAKE_REQUEST_FN], [
|
|
dnl # Checked as part of the blk_alloc_queue_request_fn test
|
|
dnl #
|
|
dnl # Linux 5.9 API Change
|
|
dnl # make_request_fn was moved into block_device_operations->submit_bio
|
|
dnl #
|
|
AC_MSG_CHECKING([whether submit_bio is member of struct block_device_operations])
|
|
ZFS_LINUX_TEST_RESULT([block_device_operations_submit_bio], [
|
|
AC_MSG_RESULT(yes)
|
|
|
|
AC_DEFINE(HAVE_SUBMIT_BIO_IN_BLOCK_DEVICE_OPERATIONS, 1,
|
|
[submit_bio is member of struct block_device_operations])
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
|
|
dnl # Checked as part of the blk_alloc_queue_request_fn test
|
|
dnl #
|
|
dnl # Linux 5.7 API Change
|
|
dnl # blk_alloc_queue() expects request function.
|
|
dnl #
|
|
AC_MSG_CHECKING([whether blk_alloc_queue() expects request function])
|
|
ZFS_LINUX_TEST_RESULT([blk_alloc_queue_request_fn], [
|
|
AC_MSG_RESULT(yes)
|
|
|
|
dnl # This is currently always the case.
|
|
AC_MSG_CHECKING([whether make_request_fn() returns blk_qc_t])
|
|
AC_MSG_RESULT(yes)
|
|
|
|
AC_DEFINE(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN, 1,
|
|
[blk_alloc_queue() expects request function])
|
|
AC_DEFINE(MAKE_REQUEST_FN_RET, blk_qc_t,
|
|
[make_request_fn() return type])
|
|
AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_QC, 1,
|
|
[Noting that make_request_fn() returns blk_qc_t])
|
|
],[
|
|
dnl #
|
|
dnl # CentOS Stream 4.18.0-257 API Change
|
|
dnl # The Linux 5.7 blk_alloc_queue() change was back-
|
|
dnl # ported and the symbol renamed blk_alloc_queue_rh().
|
|
dnl # As of this kernel version they're not providing
|
|
dnl # any compatibility code in the kernel for this.
|
|
dnl #
|
|
ZFS_LINUX_TEST_RESULT([blk_alloc_queue_request_fn_rh], [
|
|
AC_MSG_RESULT(yes)
|
|
|
|
dnl # This is currently always the case.
|
|
AC_MSG_CHECKING([whether make_request_fn_rh() returns blk_qc_t])
|
|
AC_MSG_RESULT(yes)
|
|
|
|
AC_DEFINE(HAVE_BLK_ALLOC_QUEUE_REQUEST_FN_RH, 1,
|
|
[blk_alloc_queue_rh() expects request function])
|
|
AC_DEFINE(MAKE_REQUEST_FN_RET, blk_qc_t,
|
|
[make_request_fn() return type])
|
|
AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_QC, 1,
|
|
[Noting that make_request_fn() returns blk_qc_t])
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
|
|
dnl #
|
|
dnl # Linux 3.2 API Change
|
|
dnl # make_request_fn returns void.
|
|
dnl #
|
|
AC_MSG_CHECKING(
|
|
[whether make_request_fn() returns void])
|
|
ZFS_LINUX_TEST_RESULT([make_request_fn_void], [
|
|
AC_MSG_RESULT(yes)
|
|
AC_DEFINE(MAKE_REQUEST_FN_RET, void,
|
|
[make_request_fn() return type])
|
|
AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_VOID, 1,
|
|
[Noting that make_request_fn() returns void])
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
|
|
dnl #
|
|
dnl # Linux 4.4 API Change
|
|
dnl # make_request_fn returns blk_qc_t.
|
|
dnl #
|
|
AC_MSG_CHECKING(
|
|
[whether make_request_fn() returns blk_qc_t])
|
|
ZFS_LINUX_TEST_RESULT([make_request_fn_blk_qc_t], [
|
|
AC_MSG_RESULT(yes)
|
|
AC_DEFINE(MAKE_REQUEST_FN_RET, blk_qc_t,
|
|
[make_request_fn() return type])
|
|
AC_DEFINE(HAVE_MAKE_REQUEST_FN_RET_QC, 1,
|
|
[Noting that make_request_fn() ]
|
|
[returns blk_qc_t])
|
|
],[
|
|
ZFS_LINUX_TEST_ERROR([make_request_fn])
|
|
])
|
|
])
|
|
])
|
|
])
|
|
])
|
|
])
|