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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)
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1 parent 9c8c76f commit 1a04bcfbb69c67f949cb1426a4031cdb4033c568 @kostikbel kostikbel committed Oct 6, 2013
Showing with 0 additions and 183 deletions.
  1. +0 −1 sys/conf/files
  2. +0 −182 sys/kern/uipc_cow.c
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@@ -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
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@@ -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);
-}

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