generalize the buffer pool so that NFS can become a client

[unix-history] / usr / src / sys / kern / uipc_mbuf.c

diff --git a/usr/src/sys/kern/uipc_mbuf.c b/usr/src/sys/kern/uipc_mbuf.c
index 1434ad8..d301a64 100644 (file)
--- a/usr/src/sys/kern/uipc_mbuf.c
+++ b/usr/src/sys/kern/uipc_mbuf.c
@@ -1,9 +1,19 @@
 /*
 /*

- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * All rights reserved.

  *
  *

- *     @(#)uipc_mbuf.c 7.4 (Berkeley) %G%
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *     @(#)uipc_mbuf.c 7.4.1.3 (Berkeley) %G%

  */
 
 #include "../machine/pte.h"
  */
 
 #include "../machine/pte.h"


@@ -98,16 +108,6 @@ m_clalloc(ncl, how, canwait)
        return ((caddr_t)m);
 }
 
        return ((caddr_t)m);
 }
 

-m_pgfree(addr, n)
-       caddr_t addr;
-       int n;
-{
-
-#ifdef lint
-       addr = addr; n = n;
-#endif
-}
-

 /*
  * Must be called at splimp.
  */
 /*
  * Must be called at splimp.
  */


@@ -190,6 +190,8 @@ m_more(canwait, type)
                        mbstat.m_wait++;
                        m_want++;
                        sleep((caddr_t)&mfree, PZERO - 1);
                        mbstat.m_wait++;
                        m_want++;
                        sleep((caddr_t)&mfree, PZERO - 1);

+                       if (mfree)
+                               break;

                } else {
                        mbstat.m_drops++;
                        return (NULL);
                } else {
                        mbstat.m_drops++;
                        return (NULL);


@@ -220,6 +222,7 @@ m_freem(m)
  * Mbuffer utility routines.
  */
 
  * Mbuffer utility routines.
  */
 

+/*

 /*
  * Make a copy of an mbuf chain starting "off" bytes from the beginning,
  * continuing for "len" bytes.  If len is M_COPYALL, copy to end of mbuf.
 /*
  * Make a copy of an mbuf chain starting "off" bytes from the beginning,
  * continuing for "len" bytes.  If len is M_COPYALL, copy to end of mbuf.


@@ -278,6 +281,40 @@ nospace:
        return (0);
 }
 
        return (0);
 }
 

+/*
+ * Copy data from an mbuf chain starting "off" bytes from the beginning,
+ * continuing for "len" bytes, into the indicated buffer.
+ */
+m_copydata(m, off, len, cp)
+       register struct mbuf *m;
+       register int off;
+       register int len;
+       caddr_t cp;
+{
+       register unsigned count;
+
+       if (off < 0 || len < 0)
+               panic("m_copydata");
+       while (off > 0) {
+               if (m == 0)
+                       panic("m_copydata");
+               if (off < m->m_len)
+                       break;
+               off -= m->m_len;
+               m = m->m_next;
+       }
+       while (len > 0) {
+               if (m == 0)
+                       panic("m_copydata");
+               count = MIN(m->m_len - off, len);
+               bcopy(mtod(m, caddr_t) + off, cp, count);
+               len -= count;
+               cp += count;
+               off = 0;
+               m = m->m_next;
+       }
+}
+

 m_cat(m, n)
        register struct mbuf *m, *n;
 {
 m_cat(m, n)
        register struct mbuf *m, *n;
 {