Author: imp
Date: Tue Feb 21 18:49:51 2017
New Revision: 314052
URL: https://svnweb.freebsd.org/changeset/base/314052
Log:
Document what the different flags mean for locking.
Modified:
head/sys/sys/bufobj.h
Modified: head/sys/sys/bufobj.h
==============================================================================
--- head/sys/sys/bufobj.h Tue Feb 21 18:49:30 2017 (r314051)
+++ head/sys/sys/bufobj.h Tue Feb 21 18:49:51 2017 (r314052)
@@ -88,6 +88,12 @@ 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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