1001-hotplug-store-block-params-for-cleanup.patch

From eaae036362dadc00a51441706239d47a170f8f97 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Wed, 16 Nov 2022 01:38:52 +0100
Subject: [PATCH] hotplug: store block params for cleanup
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Use /var/run/xen-hotplug for storing information needed to cleanup devices.
When called "remove" action - xenstore entriens can be already deleted.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
 tools/hotplug/Linux/block | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/hotplug/Linux/block b/tools/hotplug/Linux/block
index 2691b56951c9..dc4466906e70 100644
--- a/tools/hotplug/Linux/block
+++ b/tools/hotplug/Linux/block
@@ -3,6 +3,8 @@
 dir=$(dirname "$0")
 . "$dir/block-common.sh"
 
+HOTPLUG_STORE="/run/xen-hotplug/${XENBUS_PATH//\//-}"
+
 expand_dev() {
   local dev
   case $1 in
@@ -256,6 +258,9 @@ case "$command" in
       # script to be called twice, so just bail.
       exit 0
     fi
+    echo $p > "$HOTPLUG_STORE-params"
+    echo $mode > "$HOTPLUG_STORE-mode"
+    echo $truetype > "$HOTPLUG_STORE-type"
 
     FRONTEND_ID=$(xenstore_read "$XENBUS_PATH/frontend-id")
     FRONTEND_UUID=$(xenstore_read_default \
@@ -332,6 +337,7 @@ mount it read-write in a guest domain."
         fi
         do_or_die losetup $roflag "$loopdev" "$file"
         xenstore_write "$XENBUS_PATH/node" "$loopdev"
+        echo $loopdev > "$HOTPLUG_STORE-node"
         write_dev "$loopdev"
         release_lock "block"
         exit 0
@@ -346,6 +352,7 @@ mount it read-write in a guest domain."
     ;;
 
   remove)
+    truetype=$(cat $HOTPLUG_STORE-type || echo $truetype)
     case $truetype in
       phy)
 	exit 0
@@ -353,8 +360,8 @@ mount it read-write in a guest domain."
 
       file)
         claim_lock "block"
-        node=$(xenstore_read "$XENBUS_PATH/node")
-	losetup -d "$node"
+        node=$(cat "$HOTPLUG_STORE-node")
+        losetup -d "$node"
         release_lock "block"
 	exit 0
 	;;
-- 
2.44.0