From 1a04bcfbb69c67f949cb1426a4031cdb4033c568 Mon Sep 17 00:00:00 2001 From: kib Date: Sun, 6 Oct 2013 06:57:28 +0000 Subject: 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) --- sys/kern/uipc_cow.c | 182 ---------------------------------------------------- 1 file changed, 182 deletions(-) delete mode 100644 sys/kern/uipc_cow.c (limited to 'sys/kern') 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 - * - * 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 -__FBSDID("$FreeBSD$"); - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include - -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); -} -- cgit v1.1