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diff --git a/sys/geom/geom_vfs.c b/sys/geom/geom_vfs.c
--- a/sys/geom/geom_vfs.c
+++ b/sys/geom/geom_vfs.c
@@ -124,12 +124,12 @@
mp = cdevp->si_mountpt;
if (mp != NULL) {
if (bp->b_iocmd == BIO_READ) {
- if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
+ if (BUF_DISOWNED(bp))
mp->mnt_stat.f_asyncreads++;
else
mp->mnt_stat.f_syncreads++;
} else if (bp->b_iocmd == BIO_WRITE) {
- if (LK_HOLDER(bp->b_lock.lk_lock) == LK_KERNPROC)
+ if (BUF_DISOWNED(bp))
mp->mnt_stat.f_asyncwrites++;
else
mp->mnt_stat.f_syncwrites++;
diff --git a/sys/sys/buf.h b/sys/sys/buf.h
--- a/sys/sys/buf.h
+++ b/sys/sys/buf.h
@@ -341,6 +341,13 @@
*/
#define BUF_ISLOCKED(bp) \
lockstatus(&(bp)->b_lock)
+
+/*
+ * Check if a buffer lock is currently held by LK_KERNPROC.
+ */
+#define BUF_DISOWNED(bp) \
+ lockmgr_disowned(&(bp)->b_lock)
+
/*
* Free a buffer lock.
*/

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