From 3b34804a552df4771c2f61cd96f3a49bd7c61a66 Mon Sep 17 00:00:00 2001
From: Martin Wilck <mwilck@suse.com>
Date: Mon, 30 Aug 2021 22:00:53 +0200
Subject: [PATCH 1/2] fix: dracut: check reflink feature after loading
 dracut-init.sh

dinfo() requires dracut-init.sh to be loaded.
---
 dracut.sh | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/dracut.sh b/dracut.sh
index 092b7b426d..a88e13f855 100755
--- a/dracut.sh
+++ b/dracut.sh
@@ -1168,17 +1168,6 @@ trap 'exit 1;' SIGINT
 readonly initdir="${DRACUT_TMPDIR}/initramfs"
 mkdir -p "$initdir"
 
-if [[ $cpio_reflink == "yes" ]]; then
-    dracut_cpio="$dracutbasedir/dracut-cpio"
-    if [[ -x $dracut_cpio ]]; then
-        # align based on statfs optimal transfer size
-        cpio_align=$(stat --file-system -c "%s" -- "$initdir")
-    else
-        dinfo "cpio-reflink ignored due to lack of dracut-cpio"
-        unset cpio_reflink
-    fi
-fi
-
 # shellcheck disable=SC2154
 if [[ $early_microcode == yes ]] || { [[ $acpi_override == yes ]] && [[ -d $acpi_table_dir ]]; }; then
     readonly early_cpio_dir="${DRACUT_TMPDIR}/earlycpio"
@@ -1216,6 +1205,17 @@ else
     exit 1
 fi
 
+if [[ $cpio_reflink == "yes" ]]; then
+    dracut_cpio="$dracutbasedir/dracut-cpio"
+    if [[ -x $dracut_cpio ]]; then
+        # align based on statfs optimal transfer size
+        cpio_align=$(stat --file-system -c "%s" -- "$initdir")
+    else
+        dinfo "cpio-reflink ignored due to lack of dracut-cpio"
+        unset cpio_reflink
+    fi
+fi
+
 # shellcheck disable=SC2154
 if [[ $no_kernel != yes ]] && ! [[ -d $srcmods ]]; then
     printf "%s\n" "dracut: Cannot find module directory $srcmods" >&2

From ace2d78cde8df3c95b0a6c6e49c8ad74665f5a49 Mon Sep 17 00:00:00 2001
From: Martin Wilck <mwilck@suse.com>
Date: Mon, 30 Aug 2021 21:26:26 +0200
Subject: [PATCH 2/2] feat: dracut: determine support for cpio-reflink

The cpio-reflink feature requires certain features of the file system
and system configuratino and is incompatible with certain other
options. Make sure settings are consistent.
---
 dracut.sh | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/dracut.sh b/dracut.sh
index a88e13f855..d04e0dd4b1 100755
--- a/dracut.sh
+++ b/dracut.sh
@@ -1205,13 +1205,44 @@ else
     exit 1
 fi
 
-if [[ $cpio_reflink == "yes" ]]; then
+is_reflink_supported() {
     dracut_cpio="$dracutbasedir/dracut-cpio"
-    if [[ -x $dracut_cpio ]]; then
+    [ -x $dracut_cpio ] || {
+        dinfo "cpio-reflink ignored due to lack of dracut-cpio"
+        return 1
+    }
+    local fstype=$(find_mp_fstype $dracutsysrootdir/boot)
+    case $fstype in
+        xfs|btrfs) ;;
+        *)
+            dinfo "cpio-reflink is unsupported on $fstype"
+            return 1;;
+    esac
+    # reflinking doesn't work across mount points
+    if mountpoint -q $dracutsysrootdir/boot; then
+        dinfo "cpio-reflink ignored because /boot is a separate mountpoint"
+        return 1;
+    elif [[ $(stat -f -c %i $dracutsysrootdir/) != $(stat -f -c %i "$TMPDIR") ]]; then
+        dinfo "cpio-reflink ignored because tmpdir=\"$TMPDIR\" is on a separate file system"
+        return 1
+    else
+        return 0
+    fi
+}
+
+if [[ $cpio_reflink == "yes" ]]; then
+    if [[ ! $compress_l && $do_strip_l != "yes" ]] && is_reflink_supported; then
+        if [[ $do_strip == "yes" ]]; then
+            dinfo "ignoring --strip because of cpio-reflink"
+            do_strip="no"
+        fi
+        if [[ $compress != "$DRACUT_COMPRESS_CAT" ]]; then
+            dinfo "setting compress=\"$DRACUT_COMPRESS_CAT\" because of cpio-reflink"
+            compress="$DRACUT_COMPRESS_CAT"
+        fi
         # align based on statfs optimal transfer size
         cpio_align=$(stat --file-system -c "%s" -- "$initdir")
     else
-        dinfo "cpio-reflink ignored due to lack of dracut-cpio"
         unset cpio_reflink
     fi
 fi