Author: np
Date: Wed May 7 03:06:50 2014
New Revision: 265479
URL: http://svnweb.freebsd.org/changeset/base/265479
Log:
MFC r255047 (with a manual tweak to match the ext_free in stable/9):
Add a routine for attaching an mbuf to a buffer with an external
refcount. This one is willing to work with buffers that may already be
referenced. MEXTADD/m_extadd are suitable only for the first attachment
to a cluster -- they initialize the refcount to 1.
Modified:
stable/9/sys/sys/mbuf.h
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/sys/ (props changed)
Modified: stable/9/sys/sys/mbuf.h
==============================================================================
--- stable/9/sys/sys/mbuf.h Wed May 7 02:13:55 2014 (r265478)
+++ stable/9/sys/sys/mbuf.h Wed May 7 03:06:50 2014 (r265479)
@@ -450,6 +450,28 @@ m_gettype(int size)
return (type);
}
+/*
+ * Associated an external reference counted buffer with an mbuf.
+ */
+static __inline void
+m_extaddref(struct mbuf *m, caddr_t buf, u_int size, u_int *ref_cnt,
+ void (*freef)(void *, void *), void *arg1, void *arg2)
+{
+
+ KASSERT(ref_cnt != NULL, ("%s: ref_cnt not provided", __func__));
+
+ atomic_add_int(ref_cnt, 1);
+ m->m_flags |= M_EXT;
+ m->m_ext.ext_buf = buf;
+ m->m_ext.ref_cnt = ref_cnt;
+ m->m_data = m->m_ext.ext_buf;
+ m->m_ext.ext_size = size;
+ m->m_ext.ext_free = freef;
+ m->m_ext.ext_arg1 = arg1;
+ m->m_ext.ext_arg2 = arg2;
+ m->m_ext.ext_type = EXT_EXTREF;
+}
+
static __inline uma_zone_t
m_getzone(int size)
{
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