From abeedbde90c9a64de656fa85a60ed8842eaa7dae Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 9 Dec 2024 13:51:28 +0100
Subject: [PATCH] btrfs-util: make sure btrfs_subvol_get_info_fd() works on
 O_PATH fds

---
 src/shared/btrfs-util.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/shared/btrfs-util.c b/src/shared/btrfs-util.c
index e9a96cb3a21..9ae22d8aa56 100644
--- a/src/shared/btrfs-util.c
+++ b/src/shared/btrfs-util.c
@@ -329,6 +329,12 @@ int btrfs_subvol_get_info_fd(int fd, uint64_t subvol_id, BtrfsSubvolInfo *ret) {
         assert(fd >= 0);
         assert(ret);
 
+        /* Make sure this works on O_PATH fds */
+        _cleanup_close_ int fd_close = -EBADF;
+        fd = fd_reopen_condition(fd, O_CLOEXEC|O_RDONLY|O_DIRECTORY, O_PATH, &fd_close);
+        if (fd < 0)
+                return fd;
+
         if (subvol_id == 0) {
                 r = btrfs_subvol_get_id_fd(fd, &subvol_id);
                 if (r < 0)
-- 
2.47.3