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Linux 5.11 compat: bdev_whole()

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The bd_contains member was removed from the block_device structure.
Callers needing to determine if a vdev is a whole block device should
use the new bdev_whole() wrapper.  For older kernels we provide our
own bdev_whole() wrapper which relies on bd_contains for compatibility.

Reviewed-by: Rafael Kitover <rkitover@gmail.com>
Reviewed-by: Coleman Kane <ckane@colemankane.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #11387
Closes #11390
This commit is contained in:
Brian Behlendorf 2020-12-22 13:02:59 -08:00
parent a970f0594e
commit 72ba4b2a4c
2 changed files with 37 additions and 4 deletions
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25
config/kernel-blkdev.m4
View File

@ -271,6 +271,29 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_LOGICAL_BLOCK_SIZE], [
])
])
dnl #
dnl # 5.11 API change
dnl # Added bdev_whole() helper.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_WHOLE], [
ZFS_LINUX_TEST_SRC([bdev_whole], [
#include <linux/blkdev.h>
],[
struct block_device *bdev = NULL;
bdev = bdev_whole(bdev);
])
])
AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_BDEV_WHOLE], [
AC_MSG_CHECKING([whether bdev_whole() is available])
ZFS_LINUX_TEST_RESULT([bdev_whole], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BDEV_WHOLE, 1, [bdev_whole() is available])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
ZFS_AC_KERNEL_SRC_BLKDEV_GET_BY_PATH
ZFS_AC_KERNEL_SRC_BLKDEV_PUT
@ -281,6 +304,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLKDEV], [
ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE
ZFS_AC_KERNEL_SRC_BLKDEV_CHECK_DISK_CHANGE
ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_CHECK_MEDIA_CHANGE
ZFS_AC_KERNEL_SRC_BLKDEV_BDEV_WHOLE
])
AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
@ -293,4 +317,5 @@ AC_DEFUN([ZFS_AC_KERNEL_BLKDEV], [
ZFS_AC_KERNEL_BLKDEV_BDEV_PHYSICAL_BLOCK_SIZE
ZFS_AC_KERNEL_BLKDEV_CHECK_DISK_CHANGE
ZFS_AC_KERNEL_BLKDEV_BDEV_CHECK_MEDIA_CHANGE
ZFS_AC_KERNEL_BLKDEV_BDEV_WHOLE
])

16
module/os/linux/zfs/vdev_disk.c
View File

@ -94,6 +94,14 @@ bdev_capacity(struct block_device *bdev)
return (i_size_read(bdev->bd_inode));
}
#if !defined(HAVE_BDEV_WHOLE)
static inline struct block_device *
bdev_whole(struct block_device *bdev)
{
return (bdev->bd_contains);
}
#endif
/*
* Returns the maximum expansion capacity of the block device (in bytes).
*
@ -118,7 +126,7 @@ bdev_max_capacity(struct block_device *bdev, uint64_t wholedisk)
uint64_t psize;
int64_t available;
if (wholedisk && bdev->bd_part != NULL && bdev != bdev->bd_contains) {
if (wholedisk && bdev != bdev_whole(bdev)) {
/*
* When reporting maximum expansion capacity for a wholedisk
* deduct any capacity which is expected to be lost due to
@ -132,7 +140,7 @@ bdev_max_capacity(struct block_device *bdev, uint64_t wholedisk)
* "reserved" EFI partition: in such cases return the device
* usable capacity.
*/
available = i_size_read(bdev->bd_contains->bd_inode) -
available = i_size_read(bdev_whole(bdev)->bd_inode) -
((EFI_MIN_RESV_SIZE + NEW_START_BLOCK +
PARTITION_END_ALIGNMENT) << SECTOR_BITS);
psize = MAX(available, bdev_capacity(bdev));
@ -192,8 +200,8 @@ vdev_disk_open(vdev_t *v, uint64_t *psize, uint64_t *max_psize,
vd->vd_bdev = NULL;
if (bdev) {
if (v->vdev_expanding && bdev != bdev->bd_contains) {
bdevname(bdev->bd_contains, disk_name + 5);
if (v->vdev_expanding && bdev != bdev_whole(bdev)) {
bdevname(bdev_whole(bdev), disk_name + 5);
/*
* If userland has BLKPG_RESIZE_PARTITION,
* then it should have updated the partition