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author | np <np@FreeBSD.org> | 2013-08-29 23:46:38 +0000 |
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committer | np <np@FreeBSD.org> | 2013-08-29 23:46:38 +0000 |
commit | b31ce9ec798f31a4e3eb32e171adf40f93209e2b (patch) | |
tree | 3bcad51a456eab4d522e6ea16c86eebba7c48d68 | |
parent | f5ff33730e4d7c8ed7baf90dfb75a20ee45fdfd0 (diff) | |
download | FreeBSD-src-b31ce9ec798f31a4e3eb32e171adf40f93209e2b.zip FreeBSD-src-b31ce9ec798f31a4e3eb32e171adf40f93209e2b.tar.gz |
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.
-rw-r--r-- | sys/sys/mbuf.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h index 930a322..bc2924a 100644 --- a/sys/sys/mbuf.h +++ b/sys/sys/mbuf.h @@ -545,6 +545,28 @@ 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, + int (*freef)(struct mbuf *, 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) { |