get block device driver if in a virtual subsystem

(cherry picked from commit 2c3017817e2cfc2f246b98dc8c45338c0a57737a)

backport-fix-dracut-functions.sh-get-block-device-driver-if-i.patch

@@ -0,0 +1,65 @@
+From dc3b976f3393d7a3fb75b349418fc8ee2c9142bd Mon Sep 17 00:00:00 2001
+From: Antonio Alvarez Feijoo <antonio.feijoo@suse.com>
+Date: Wed, 10 Nov 2021 10:19:14 +0100
+Subject: [PATCH] fix(dracut-functions.sh): get block device driver if in a
+ virtual subsystem
+
+dracut does not install the kernel module of the block device that contains
+the root filesystem if the following preconditions are met:
+- Running in host-only mode.
+- Symlinks of all block devices needed to boot the system pointing to virtual
+subsystems.
+
+The get_dev_module function uses "udevadm info -a" to get the corresponding
+kernel modules of a /sys/class/*/* or /dev/* device. This function is called
+in modules.d/90kernel-modules/module-setup.sh to detect if dracut must install
+block device drivers in host-only mode. The symlinks in /sys/dev/block/
+usually point to "real" devices in /sys/devices/pci*. But, we have come across
+some NVMe systems where the kernel creates the symlinks in /sys/dev/block/
+pointing to "virtual" devices instead. In this case, udevadm never finds any
+"driver" attributes following up the chain of parent devices.
+
+Reference:https://github.com/dracutdevs/dracut/commit/dc3b976f3393d7a3fb75b349418fc8ee2c9142bd
+Conflict:NA
+---
+ dracut-functions.sh | 26 +++++++++++++++++++++++++-
+ 1 file changed, 25 insertions(+), 1 deletion(-)
+
+diff --git a/dracut-functions.sh b/dracut-functions.sh
+index 32177994..63b6c892 100755
+--- a/dracut-functions.sh
++++ b/dracut-functions.sh
+@@ -945,5 +945,29 @@ block_is_netdevice() {
+ 
+ # get the corresponding kernel modules of a /sys/class/*/* or/dev/* device
+ get_dev_module() {
+-    udevadm info -a "$1" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p'
++    local dev_attr_walk
++    local dev_drivers
++    dev_attr_walk=$(udevadm info -a "$1")
++    dev_drivers=$(echo "$dev_attr_walk" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p')
++    # if no kernel modules found and device is in a virtual subsystem, follow symlinks
++    if [[ -z $dev_drivers && $(udevadm info -q path "$1") == "/devices/virtual"* ]]; then
++        local dev_vkernel
++        local dev_vsubsystem
++        local dev_vpath
++        dev_vkernel=$(echo "$dev_attr_walk" | sed -n 's/\s*KERNELS=="\(\S\+\)"/\1/p' | tail -1)
++        dev_vsubsystem=$(echo "$dev_attr_walk" | sed -n 's/\s*SUBSYSTEMS=="\(\S\+\)"/\1/p' | tail -1)
++        dev_vpath="/sys/devices/virtual/$dev_vsubsystem/$dev_vkernel"
++        if [[ -n $dev_vkernel && -n $dev_vsubsystem && -d $dev_vpath ]]; then
++            local dev_links
++            local dev_link
++            dev_links=$(find "$dev_vpath" -maxdepth 1 -type l ! -name "subsystem" -exec readlink {} \;)
++            for dev_link in $dev_links; do
++                [[ -n $dev_drivers && ${dev_drivers: -1} != $'\n' ]] && dev_drivers+=$'\n'
++                dev_drivers+=$(udevadm info -a "$dev_vpath/$dev_link" \
++                    | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p' \
++                    | grep -v -e pcieport)
++            done
++        fi
++    fi
++    echo "$dev_drivers"
+ }
+-- 
+2.33.0
+

dracut.spec

@@ -9,7 +9,7 @@
 
 Name: dracut
 Version: 055
-Release: 7
+Release: 8
 
 Summary: Initramfs generator using udev
 
@@ -40,6 +40,7 @@ Patch13: backport-feat-lvm-only-run-lvchange-for-LV-that-is-seen-on-de.patch
 Patch14: backport-fix-lvm-restore-setting-LVM_MD_PV_ACTIVATED.patch
 Patch15: backport-Bring-back-51-dracut-rescue-postinst.sh.patch
 Patch16: backport-fix-dracut-shutdown-add-cleanup-handler-on-failure.patch
+Patch17: backport-fix-dracut-functions.sh-get-block-device-driver-if-i.patch
 
 Patch9000: remove-iscsi-related-code-since-it-is-no-longer-main.patch
 
@@ -516,6 +517,9 @@ install -m 0755 51-dracut-rescue-postinst.sh $RPM_BUILD_ROOT%{_sysconfdir}/kerne
 %endif
 
 %changelog
+* Thu Nov 16 2023 wangyuhang <wangyuhang27@huawei.com> - 055-8
+- get block device driver if in a virtual subsystem
+
 * Wed Mar 22 2023 wangyuhang <wangyuhang27@huawei.com> - 055-7
 - fix(dracut-shutdown): add cleanup handler on failure