Annotate KM_PUSHPAGE call paths with PF_NOFS

[zfs.git] / module / zfs / txg.c

diff --git a/module/zfs/txg.c b/module/zfs/txg.c
index c234567..aefda6f 100644 (file)
--- a/module/zfs/txg.c
+++ b/module/zfs/txg.c
@@ -382,6 +382,15 @@ txg_sync_thread(dsl_pool_t *dp)
        callb_cpr_t cpr;
        uint64_t start, delta;
 
+#ifdef _KERNEL
+       /*
+        * Annotate this process with a flag that indicates that it is
+        * unsafe to use KM_SLEEP during memory allocations due to the
+        * potential for a deadlock.  KM_PUSHPAGE should be used instead.
+        */
+       current->flags |= PF_NOFS;
+#endif /* _KERNEL */
+
        txg_thread_enter(tx, &cpr);
 
        start = delta = 0;