LU-12780 scrub: all update to bitfields must be protected.

[fs/lustre-release.git] / lustre / include / lustre_scrub.h

diff --git a/lustre/include/lustre_scrub.h b/lustre/include/lustre_scrub.h
index 313af0f..a4eb139 100644 (file)
--- a/lustre/include/lustre_scrub.h
+++ b/lustre/include/lustre_scrub.h
@@ -288,6 +288,10 @@ struct lustre_scrub {
        __u64                   os_new_checked;
        __u64                   os_pos_current;
        __u32                   os_start_flags;
+       /* Some of these bits can be set by different threads so
+        * all updates must be protected by ->os_lock to avoid
+        * racing read-modify-write cycles causing corruption.
+        */
        unsigned int            os_in_prior:1, /* process inconsistent item
                                                * found by RPC prior */
                                os_waiting:1, /* Waiting for scan window. */