Author: eadler
Date: Mon Mar 19 03:04:19 2018
New Revision: 331158
URL: https://svnweb.freebsd.org/changeset/base/331158
Log:
MFC r314052:
Document what the different flags mean for locking.
Modified:
stable/11/sys/sys/bufobj.h
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/sys/bufobj.h
==============================================================================
--- stable/11/sys/sys/bufobj.h Mon Mar 19 02:46:17 2018 (r331157)
+++ stable/11/sys/sys/bufobj.h Mon Mar 19 03:04:19 2018 (r331158)
@@ -90,6 +90,12 @@ struct buf_ops {
#define BO_WRITE(bo, bp) ((bo)->bo_ops->bop_write((bp)))
#define BO_BDFLUSH(bo, bp) ((bo)->bo_ops->bop_bdflush((bo), (bp)))
+/*
+ * Locking notes:
+ * 'S' is sync_mtx
+ * 'v' is the vnode lock which embeds the bufobj.
+ * '-' Constant and unchanging after initialization.
+ */
struct bufobj {
struct rwlock bo_lock; /* Lock which protects "i" things */
struct buf_ops *bo_ops; /* - Buffer operations */
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