Remove the uipc_cow.c file, which is not used since the zero copy

sockets removal.

Noted by:	alc
Sponsored by:	The FreeBSD Foundation
Approved by:	re (delphij)

2 files changed, 0 insertions, 183 deletions

diff --git a/sys/conf/files b/sys/conf/files
index 7ba7e7c..9ffad34 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -2919,7 +2919,6 @@ kern/tty_pts.c			standard
 kern/tty_tty.c			standard
 kern/tty_ttydisc.c		standard
 kern/uipc_accf.c		optional inet
-kern/uipc_cow.c			optional socket_send_cow
 kern/uipc_debug.c		optional ddb
 kern/uipc_domain.c		standard
 kern/uipc_mbuf.c		standard
diff --git a/sys/kern/uipc_cow.c b/sys/kern/uipc_cow.c
deleted file mode 100644
index 8a3a5ff..0000000
--- a/sys/kern/uipc_cow.c
+++ /dev/null
@@ -1,182 +0,0 @@
-/*--
- * Copyright (c) 1997, Duke University
- * All rights reserved.
- *
- * Author:
- *         Andrew Gallatin <gallatin@cs.duke.edu>  
- *            
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The name of Duke University may not be used to endorse or promote 
- *    products derived from this software without specific prior written 
- *    permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY DUKE UNIVERSITY ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL DUKE UNIVERSITY BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITSOR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
- * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
- */
-
-/*
- * This is a set of routines for enabling and disabling copy on write
- * protection for data written into sockets.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/sysctl.h>
-#include <sys/kernel.h>
-#include <sys/proc.h>
-#include <sys/lock.h>
-#include <sys/mutex.h>
-#include <sys/mbuf.h>
-#include <sys/sf_buf.h>
-#include <sys/socketvar.h>
-#include <sys/uio.h>
-
-#include <vm/vm.h>
-#include <vm/vm_extern.h>
-#include <vm/vm_param.h>
-#include <vm/pmap.h>
-#include <vm/vm_map.h>
-#include <vm/vm_page.h>
-#include <vm/vm_object.h>
-
-FEATURE(zero_copy_sockets, "Zero copy sockets support");
-
-struct netsend_cow_stats {
-	int attempted;
-	int fail_not_mapped;
-	int fail_sf_buf;
-	int success;
-	int iodone;
-};
-
-static struct netsend_cow_stats socow_stats;
-
-static int socow_iodone(struct mbuf *m, void *addr, void *args);
-
-static int
-socow_iodone(struct mbuf *m, void *addr, void *args)
-{	
-	struct sf_buf *sf;
-	vm_page_t pp;
-
-	sf = args;
-	pp = sf_buf_page(sf);
-	sf_buf_free(sf);
-	/* remove COW mapping  */
-	vm_page_lock(pp);
-	vm_page_cowclear(pp);
-	vm_page_unwire(pp, 0);
-	/*
-	 * Check for the object going away on us. This can
-	 * happen since we don't hold a reference to it.
-	 * If so, we're responsible for freeing the page.
-	 */
-	if (pp->wire_count == 0 && pp->object == NULL)
-		vm_page_free(pp);
-	vm_page_unlock(pp);
-	socow_stats.iodone++;
-	return (EXT_FREE_OK);
-}
-
-int
-socow_setup(struct mbuf *m0, struct uio *uio)
-{
-	struct sf_buf *sf;
-	vm_page_t pp;
-	struct iovec *iov;
-	struct vmspace *vmspace;
-	struct vm_map *map;
-	vm_offset_t offset, uva;
-	vm_size_t len;
-
-	socow_stats.attempted++;
-	vmspace = curproc->p_vmspace;
-	map = &vmspace->vm_map;
-	uva = (vm_offset_t) uio->uio_iov->iov_base;
-	offset = uva & PAGE_MASK;
-	len = PAGE_SIZE - offset;
-
-	/*
-	 * Verify that access to the given address is allowed from user-space.
-	 */
-	if (vm_fault_quick_hold_pages(map, uva, len, VM_PROT_READ, &pp, 1) <
-	    0) {
-		socow_stats.fail_not_mapped++;
-		return(0);
-	}
-
-	/* 
-	 * set up COW
-	 */
-	vm_page_lock(pp);
-	if (vm_page_cowsetup(pp) != 0) {
-		vm_page_unhold(pp);
-		vm_page_unlock(pp);
-		return (0);
-	}
-
-	/*
-	 * wire the page for I/O
-	 */
-	vm_page_wire(pp);
-	vm_page_unhold(pp);
-	vm_page_unlock(pp);
-	/*
-	 * Allocate an sf buf
-	 */
-	sf = sf_buf_alloc(pp, SFB_CATCH);
-	if (sf == NULL) {
-		vm_page_lock(pp);
-		vm_page_cowclear(pp);
-		vm_page_unwire(pp, 0);
-		/*
-		 * Check for the object going away on us. This can
-		 * happen since we don't hold a reference to it.
-		 * If so, we're responsible for freeing the page.
-		 */
-		if (pp->wire_count == 0 && pp->object == NULL)
-			vm_page_free(pp);
-		vm_page_unlock(pp);
-		socow_stats.fail_sf_buf++;
-		return(0);
-	}
-	/* 
-	 * attach to mbuf
-	 */
-	MEXTADD(m0, sf_buf_kva(sf), PAGE_SIZE, socow_iodone,
-	    (void*)sf_buf_kva(sf), sf, M_RDONLY, EXT_SFBUF);
-	m0->m_len = len;
-	m0->m_data = (caddr_t)sf_buf_kva(sf) + offset;
-	socow_stats.success++;
-
-	iov = uio->uio_iov;
-	iov->iov_base = (char *)iov->iov_base + m0->m_len;
-	iov->iov_len -= m0->m_len;
-	uio->uio_resid -= m0->m_len;
-	uio->uio_offset += m0->m_len;
-	if (iov->iov_len == 0) {
-		uio->uio_iov++;
-		uio->uio_iovcnt--;
-	}
-
-	return(m0->m_len);
-}