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Linux 6.5 compat: blkdev changes

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Multiple changes to the blkdev API were introduced in Linux 6.5. This
includes passing (void* holder) to blkdev_put, adding a new
blk_holder_ops* arg to blkdev_get_by_path, adding a new blk_mode_t type
that replaces uses of fmode_t, and removing an argument from the release
handler on block_device_operations that we weren't using. The open
function definition has also changed to take gendisk* and blk_mode_t, so
update it accordingly, too.

Implement local wrappers for blkdev_get_by_path() and
vdev_blkdev_put() so that the in-line calls are cleaner, and place the
conditionally-compiled implementation details inside of both of these
local wrappers. Both calls are exclusively used within vdev_disk.c, at
this time.

Add blk_mode_is_open_write() to test FMODE_WRITE / BLK_OPEN_WRITE
The wrapper function is now used for testing using the appropriate
method for the kernel, whether the open mode is writable or not.

Emphasize fmode_t arg in zvol_release is not used

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #15099
This commit is contained in:
Coleman Kane
2023-08-01 11:37:20 -04:00
committed by Tony Hutter
parent 3ff9e4f8ac
commit 7c0618bdb7
7 changed files with 203 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
config/kernel-blkdev.m4
+81 -3
View File
@@ -16,12 +16,63 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH], [
])
])
dnl #
dnl # 6.5.x API change,
dnl # blkdev_get_by_path() takes 4 args
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH_4ARG], [
ZFS_LINUX_TEST_SRC([blkdev_get_by_path_4arg], [
#include <linux/fs.h>
#include <linux/blkdev.h>
], [
struct block_device *bdev __attribute__ ((unused)) = NULL;
const char *path = "path";
fmode_t mode = 0;
void *holder = NULL;
struct blk_holder_ops h;
bdev = blkdev_get_by_path(path, mode, holder, &h);
])
])
AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH], [
AC_MSG_CHECKING([whether blkdev_get_by_path() exists])
AC_MSG_CHECKING([whether blkdev_get_by_path() exists and takes 3 args])
ZFS_LINUX_TEST_RESULT([blkdev_get_by_path], [
AC_MSG_RESULT(yes)
], [
ZFS_LINUX_TEST_ERROR([blkdev_get_by_path()])
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether blkdev_get_by_path() exists and takes 4 args])
ZFS_LINUX_TEST_RESULT([blkdev_get_by_path_4arg], [
AC_DEFINE(HAVE_BLKDEV_GET_BY_PATH_4ARG, 1,
[blkdev_get_by_path() exists and takes 4 args])
AC_MSG_RESULT(yes)
], [
ZFS_LINUX_TEST_ERROR([blkdev_get_by_path()])
])
])
])
dnl #
dnl # 6.5.x API change
dnl # blk_mode_t was added as a type to supercede some places where fmode_t
dnl # is used
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BLK_MODE_T], [
ZFS_LINUX_TEST_SRC([blk_mode_t], [
#include <linux/fs.h>
#include <linux/blkdev.h>
], [
blk_mode_t m __attribute((unused)) = (blk_mode_t)0;
])
])
AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BLK_MODE_T], [
AC_MSG_CHECKING([whether blk_mode_t is defined])
ZFS_LINUX_TEST_RESULT([blk_mode_t], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLK_MODE_T, 1, [blk_mode_t is defined])
], [
AC_MSG_RESULT(no)
])
])
@@ -41,12 +92,35 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_PUT], [
])
])
dnl #
dnl # 6.5.x API change.
dnl # blkdev_put() takes (void* holder) as arg 2
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_PUT_HOLDER], [
ZFS_LINUX_TEST_SRC([blkdev_put_holder], [
#include <linux/fs.h>
#include <linux/blkdev.h>
], [
struct block_device *bdev = NULL;
void *holder = NULL;
blkdev_put(bdev, holder);
])
])
AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_PUT], [
AC_MSG_CHECKING([whether blkdev_put() exists])
ZFS_LINUX_TEST_RESULT([blkdev_put], [
AC_MSG_RESULT(yes)
], [
ZFS_LINUX_TEST_ERROR([blkdev_put()])
AC_MSG_CHECKING([whether blkdev_put() accepts void* as arg 2])
ZFS_LINUX_TEST_RESULT([blkdev_put_holder], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BLKDEV_PUT_HOLDER, 1,
[blkdev_put() accepts void* as arg 2])
], [
ZFS_LINUX_TEST_ERROR([blkdev_put()])
])
])
])
@@ -495,7 +569,9 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BLK_STS_RESV_CONFLICT], [
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH
ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH_4ARG
ZFS_AC_KERNEL_SRC_BLKDEV_PUT
ZFS_AC_KERNEL_SRC_BLKDEV_PUT_HOLDER
ZFS_AC_KERNEL_SRC_BLKDEV_REREAD_PART
ZFS_AC_KERNEL_SRC_BLKDEV_INVALIDATE_BDEV
ZFS_AC_KERNEL_SRC_BLKDEV_LOOKUP_BDEV
@@ -510,6 +586,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
ZFS_AC_KERNEL_SRC_BLKDEV_PART_TO_DEV
ZFS_AC_KERNEL_SRC_BLKDEV_DISK_CHECK_MEDIA_CHANGE
ZFS_AC_KERNEL_SRC_BLKDEV_BLK_STS_RESV_CONFLICT
ZFS_AC_KERNEL_SRC_BLKDEV_BLK_MODE_T
])
AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
@@ -530,4 +607,5 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
ZFS_AC_KERNEL_BLKDEV_PART_TO_DEV
ZFS_AC_KERNEL_BLKDEV_DISK_CHECK_MEDIA_CHANGE
ZFS_AC_KERNEL_BLKDEV_BLK_STS_RESV_CONFLICT
ZFS_AC_KERNEL_BLKDEV_BLK_MODE_T
])
config/kernel-block-device-operations.m4
+33 -2
View File
@@ -49,12 +49,42 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
], [], [])
])
dnl #
dnl # 5.9.x API change
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG], [
ZFS_LINUX_TEST_SRC([block_device_operations_release_void_1arg], [
#include <linux/blkdev.h>
void blk_release(struct gendisk *g) {
(void) g;
return;
}
static const struct block_device_operations
bops __attribute__ ((unused)) = {
.open = NULL,
.release = blk_release,
.ioctl = NULL,
.compat_ioctl = NULL,
};
], [], [])
])
AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID], [
AC_MSG_CHECKING([whether bops->release() is void])
AC_MSG_CHECKING([whether bops->release() is void and takes 2 args])
ZFS_LINUX_TEST_RESULT([block_device_operations_release_void], [
AC_MSG_RESULT(yes)
],[
ZFS_LINUX_TEST_ERROR([bops->release()])
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether bops->release() is void and takes 1 arg])
ZFS_LINUX_TEST_RESULT([block_device_operations_release_void_1arg], [
AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG], [1],
[Define if release() in block_device_operations takes 1 arg])
],[
ZFS_LINUX_TEST_ERROR([bops->release()])
])
])
])
@@ -92,6 +122,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK], [
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS], [
ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_CHECK_EVENTS
ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_RELEASE_1ARG
ZFS_AC_KERNEL_SRC_BLOCK_DEVICE_OPERATIONS_REVALIDATE_DISK
])