From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 30 Jul 2020 16:48:52 +0000 (+0200)
Subject: loop-util: define API for syncing loopback device
X-Git-Tag: v247-rc1~369^2~17
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8dbc208cc1a7bbd9af44d98df4a4eb472266699a;p=thirdparty%2Fsystemd.git

loop-util: define API for syncing loopback device
---

diff --git a/src/shared/loop-util.c b/src/shared/loop-util.c
index 8db2fed66ff..fb88f51849a 100644
--- a/src/shared/loop-util.c
+++ b/src/shared/loop-util.c
@@ -472,3 +472,18 @@ int loop_device_flock(LoopDevice *d, int operation) {
 
         return 0;
 }
+
+int loop_device_sync(LoopDevice *d) {
+        assert(d);
+
+        /* We also do this implicitly in loop_device_unref(). Doing this explicitly here has the benefit that
+         * we can check the return value though. */
+
+        if (d->fd < 0)
+                return -EBADF;
+
+        if (fsync(d->fd) < 0)
+                return -errno;
+
+        return 0;
+}
diff --git a/src/shared/loop-util.h b/src/shared/loop-util.h
index 73f82a6d305..16f215b059a 100644
--- a/src/shared/loop-util.h
+++ b/src/shared/loop-util.h
@@ -26,3 +26,4 @@ void loop_device_relinquish(LoopDevice *d);
 int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size);
 
 int loop_device_flock(LoopDevice *d, int operation);
+int loop_device_sync(LoopDevice *d);