From 91358db9dcb752f7ff5aac6638c6c7462d75001a Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 21 Jun 2021 11:18:39 +0200
Subject: [PATCH] fs-util: add fd-based flavour of path_is_encrypted()

---
 src/shared/blockdev-util.c | 16 ++++++++++++++++
 src/shared/blockdev-util.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/src/shared/blockdev-util.c b/src/shared/blockdev-util.c
index fa2d6d6add8..53df7d2f0d2 100644
--- a/src/shared/blockdev-util.c
+++ b/src/shared/blockdev-util.c
@@ -334,6 +334,22 @@ static int blockdev_is_encrypted(const char *sysfs_path, unsigned depth_left) {
         return found_encrypted;
 }
 
+int fd_is_encrypted(int fd) {
+        char p[SYS_BLOCK_PATH_MAX(NULL)];
+        dev_t devt;
+        int r;
+
+        r = get_block_device_fd(fd, &devt);
+        if (r < 0)
+                return r;
+        if (r == 0) /* doesn't have a block device */
+                return false;
+
+        xsprintf_sys_block_path(p, NULL, devt);
+
+        return blockdev_is_encrypted(p, 10 /* safety net: maximum recursion depth */);
+}
+
 int path_is_encrypted(const char *path) {
         char p[SYS_BLOCK_PATH_MAX(NULL)];
         dev_t devt;
diff --git a/src/shared/blockdev-util.h b/src/shared/blockdev-util.h
index 90d9f136732..d36707cf632 100644
--- a/src/shared/blockdev-util.h
+++ b/src/shared/blockdev-util.h
@@ -24,4 +24,5 @@ int lock_whole_block_device(dev_t devt, int operation);
 
 int blockdev_partscan_enabled(int fd);
 
+int fd_is_encrypted(int fd);
 int path_is_encrypted(const char *path);
-- 
2.47.3