libublk: call pctl(PR_SET_IO_FLUSHER) in UblkQueue context

Call pctl(PR_SET_IO_FLUSHER) in UblkQueue context for avoiding potential memory deadlock. Signed-off-by: Ming Lei <tom.leiming@gmail.com>
ublk-org · Oct 14, 2023 · 8364e4b · 8364e4b
1 parent ad7f082
commit 8364e4b
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/lib.rs b/src/lib.rs
@@ -215,6 +215,11 @@ impl UblkSession {
                 }
                 _tx.send((q, unsafe { libc::gettid() })).unwrap();
 
+                unsafe {
+                    const PR_SET_IO_FLUSHER: i32 = 57; //include/uapi/linux/prctl.h
+                    libc::prctl(PR_SET_IO_FLUSHER, 0, 0, 0, 0);
+                };
+
                 _q_fn(q, &_dev);
             }));
         }