From d4acc09d9d51be1417ce7ca33730cc8fb8c2bc4c Mon Sep 17 00:00:00 2001
From: Pontus Lundkvist <p@article.se>
Date: Fri, 27 Feb 2026 14:05:10 +0100
Subject: [PATCH 1/2] mountpoint-util: add exempt for overlay in
 fstype_is_blockdev_backed()

This allows `systemd-mount` to be used with --type overlay
---
 src/basic/mountpoint-util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/basic/mountpoint-util.c b/src/basic/mountpoint-util.c
index 624a3fcbed0..8b293401bd9 100644
--- a/src/basic/mountpoint-util.c
+++ b/src/basic/mountpoint-util.c
@@ -402,7 +402,7 @@ bool fstype_is_blockdev_backed(const char *fstype) {
         if (x)
                 fstype = x;
 
-        return !streq(fstype, "9p") && !fstype_is_network(fstype) && !fstype_is_api_vfs(fstype);
+        return !STR_IN_SET(fstype, "9p", "overlay") && !fstype_is_network(fstype) && !fstype_is_api_vfs(fstype);
 }
 
 bool fstype_is_ro(const char *fstype) {

From 352bb934fe6d064c74114a142f645fe2f6f8729b Mon Sep 17 00:00:00 2001
From: Pontus Lundkvist <p@article.se>
Date: Fri, 27 Feb 2026 14:09:59 +0100
Subject: [PATCH 2/2] mountpoint-util: remove duplicate check in
 fstype_is_api_vfs()

devtmpfs is part of the @basic-api filesystem-set
---
 src/basic/mountpoint-util.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/basic/mountpoint-util.c b/src/basic/mountpoint-util.c
index 8b293401bd9..06d4d4450a2 100644
--- a/src/basic/mountpoint-util.c
+++ b/src/basic/mountpoint-util.c
@@ -391,8 +391,7 @@ bool fstype_is_api_vfs(const char *fstype) {
         /* Filesystems not present in the internal database */
         return STR_IN_SET(fstype,
                           "autofs",
-                          "cpuset",
-                          "devtmpfs");
+                          "cpuset");
 }
 
 bool fstype_is_blockdev_backed(const char *fstype) {