1374 lines
34 KiB
C
1374 lines
34 KiB
C
/*-
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* Copyright (c) 2013-2015 Gleb Smirnoff <glebius@FreeBSD.org>
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* Copyright (c) 1998, David Greenman. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_kern_tls.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/capsicum.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/ktls.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/mbuf.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/rwlock.h>
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#include <sys/sf_buf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/sysproto.h>
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#include <sys/vnode.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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static MALLOC_DEFINE(M_SENDFILE, "sendfile", "sendfile dynamic memory");
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#define EXT_FLAG_SYNC EXT_FLAG_VENDOR1
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#define EXT_FLAG_NOCACHE EXT_FLAG_VENDOR2
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#define EXT_FLAG_CACHE_LAST EXT_FLAG_VENDOR3
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/*
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* Structure describing a single sendfile(2) I/O, which may consist of
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* several underlying pager I/Os.
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*
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* The syscall context allocates the structure and initializes 'nios'
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* to 1. As sendfile_swapin() runs through pages and starts asynchronous
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* paging operations, it increments 'nios'.
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*
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* Every I/O completion calls sendfile_iodone(), which decrements the 'nios',
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* and the syscall also calls sendfile_iodone() after allocating all mbufs,
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* linking them and sending to socket. Whoever reaches zero 'nios' is
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* responsible to * call pru_ready on the socket, to notify it of readyness
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* of the data.
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*/
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struct sf_io {
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volatile u_int nios;
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u_int error;
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int npages;
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struct socket *so;
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struct mbuf *m;
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vm_object_t obj;
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vm_pindex_t pindex0;
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#ifdef KERN_TLS
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struct ktls_session *tls;
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#endif
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vm_page_t pa[];
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};
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/*
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* Structure used to track requests with SF_SYNC flag.
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*/
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struct sendfile_sync {
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struct mtx mtx;
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struct cv cv;
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unsigned count;
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bool waiting;
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};
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static void
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sendfile_sync_destroy(struct sendfile_sync *sfs)
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{
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KASSERT(sfs->count == 0, ("sendfile sync %p still busy", sfs));
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cv_destroy(&sfs->cv);
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mtx_destroy(&sfs->mtx);
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free(sfs, M_SENDFILE);
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}
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static void
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sendfile_sync_signal(struct sendfile_sync *sfs)
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{
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mtx_lock(&sfs->mtx);
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KASSERT(sfs->count > 0, ("sendfile sync %p not busy", sfs));
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if (--sfs->count == 0) {
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if (!sfs->waiting) {
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/* The sendfile() waiter was interrupted by a signal. */
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sendfile_sync_destroy(sfs);
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return;
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} else {
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cv_signal(&sfs->cv);
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}
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}
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mtx_unlock(&sfs->mtx);
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}
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counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
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static void
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sfstat_init(const void *unused)
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{
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COUNTER_ARRAY_ALLOC(sfstat, sizeof(struct sfstat) / sizeof(uint64_t),
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M_WAITOK);
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}
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SYSINIT(sfstat, SI_SUB_MBUF, SI_ORDER_FIRST, sfstat_init, NULL);
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static int
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sfstat_sysctl(SYSCTL_HANDLER_ARGS)
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{
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struct sfstat s;
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COUNTER_ARRAY_COPY(sfstat, &s, sizeof(s) / sizeof(uint64_t));
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if (req->newptr)
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COUNTER_ARRAY_ZERO(sfstat, sizeof(s) / sizeof(uint64_t));
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return (SYSCTL_OUT(req, &s, sizeof(s)));
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}
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SYSCTL_PROC(_kern_ipc, OID_AUTO, sfstat,
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CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, 0,
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sfstat_sysctl, "I",
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"sendfile statistics");
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static void
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sendfile_free_mext(struct mbuf *m)
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{
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struct sf_buf *sf;
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vm_page_t pg;
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int flags;
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KASSERT(m->m_flags & M_EXT && m->m_ext.ext_type == EXT_SFBUF,
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("%s: m %p !M_EXT or !EXT_SFBUF", __func__, m));
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sf = m->m_ext.ext_arg1;
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pg = sf_buf_page(sf);
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flags = (m->m_ext.ext_flags & EXT_FLAG_NOCACHE) != 0 ? VPR_TRYFREE : 0;
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sf_buf_free(sf);
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vm_page_release(pg, flags);
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if (m->m_ext.ext_flags & EXT_FLAG_SYNC) {
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struct sendfile_sync *sfs = m->m_ext.ext_arg2;
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sendfile_sync_signal(sfs);
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}
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}
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static void
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sendfile_free_mext_pg(struct mbuf *m)
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{
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vm_page_t pg;
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int flags, i;
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bool cache_last;
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M_ASSERTEXTPG(m);
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cache_last = m->m_ext.ext_flags & EXT_FLAG_CACHE_LAST;
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flags = (m->m_ext.ext_flags & EXT_FLAG_NOCACHE) != 0 ? VPR_TRYFREE : 0;
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for (i = 0; i < m->m_epg_npgs; i++) {
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if (cache_last && i == m->m_epg_npgs - 1)
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flags = 0;
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pg = PHYS_TO_VM_PAGE(m->m_epg_pa[i]);
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vm_page_release(pg, flags);
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}
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if (m->m_ext.ext_flags & EXT_FLAG_SYNC) {
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struct sendfile_sync *sfs = m->m_ext.ext_arg1;
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sendfile_sync_signal(sfs);
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}
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}
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/*
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* Helper function to calculate how much data to put into page i of n.
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* Only first and last pages are special.
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*/
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static inline off_t
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xfsize(int i, int n, off_t off, off_t len)
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{
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if (i == 0)
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return (omin(PAGE_SIZE - (off & PAGE_MASK), len));
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if (i == n - 1 && ((off + len) & PAGE_MASK) > 0)
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return ((off + len) & PAGE_MASK);
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return (PAGE_SIZE);
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}
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/*
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* Helper function to get offset within object for i page.
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*/
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static inline vm_ooffset_t
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vmoff(int i, off_t off)
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{
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if (i == 0)
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return ((vm_ooffset_t)off);
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return (trunc_page(off + i * PAGE_SIZE));
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}
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/*
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* Helper function used when allocation of a page or sf_buf failed.
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* Pretend as if we don't have enough space, subtract xfsize() of
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* all pages that failed.
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*/
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static inline void
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fixspace(int old, int new, off_t off, int *space)
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{
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KASSERT(old > new, ("%s: old %d new %d", __func__, old, new));
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/* Subtract last one. */
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*space -= xfsize(old - 1, old, off, *space);
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old--;
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if (new == old)
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/* There was only one page. */
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return;
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/* Subtract first one. */
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if (new == 0) {
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*space -= xfsize(0, old, off, *space);
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new++;
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}
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/* Rest of pages are full sized. */
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*space -= (old - new) * PAGE_SIZE;
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KASSERT(*space >= 0, ("%s: space went backwards", __func__));
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}
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/*
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* Wait for all in-flight ios to complete, we must not unwire pages
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* under them.
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*/
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static void
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sendfile_iowait(struct sf_io *sfio, const char *wmesg)
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{
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while (atomic_load_int(&sfio->nios) != 1)
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pause(wmesg, 1);
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}
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/*
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* I/O completion callback.
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*/
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static void
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sendfile_iodone(void *arg, vm_page_t *pa, int count, int error)
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{
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struct sf_io *sfio = arg;
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struct socket *so;
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int i;
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if (error != 0)
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sfio->error = error;
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/*
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* Restore the valid page pointers. They are already
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* unbusied, but still wired.
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*
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* XXXKIB since pages are only wired, and we do not
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* own the object lock, other users might have
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* invalidated them in meantime. Similarly, after we
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* unbusied the swapped-in pages, they can become
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* invalid under us.
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*/
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MPASS(count == 0 || pa[0] != bogus_page);
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for (i = 0; i < count; i++) {
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if (pa[i] == bogus_page) {
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sfio->pa[(pa[0]->pindex - sfio->pindex0) + i] =
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pa[i] = vm_page_relookup(sfio->obj,
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pa[0]->pindex + i);
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KASSERT(pa[i] != NULL,
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("%s: page %p[%d] disappeared",
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__func__, pa, i));
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} else {
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vm_page_xunbusy_unchecked(pa[i]);
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}
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}
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if (!refcount_release(&sfio->nios))
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return;
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#ifdef INVARIANTS
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for (i = 1; i < sfio->npages; i++) {
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if (sfio->pa[i] == NULL)
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break;
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KASSERT(vm_page_wired(sfio->pa[i]),
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("sfio %p page %d %p not wired", sfio, i, sfio->pa[i]));
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if (i == 0)
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continue;
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KASSERT(sfio->pa[0]->object == sfio->pa[i]->object,
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("sfio %p page %d %p wrong owner %p %p", sfio, i,
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sfio->pa[i], sfio->pa[0]->object, sfio->pa[i]->object));
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KASSERT(sfio->pa[0]->pindex + i == sfio->pa[i]->pindex,
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("sfio %p page %d %p wrong index %jx %jx", sfio, i,
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sfio->pa[i], (uintmax_t)sfio->pa[0]->pindex,
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(uintmax_t)sfio->pa[i]->pindex));
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}
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#endif
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vm_object_pip_wakeup(sfio->obj);
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if (sfio->m == NULL) {
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/*
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* Either I/O operation failed, or we failed to allocate
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* buffers, or we bailed out on first busy page, or we
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* succeeded filling the request without any I/Os. Anyway,
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* pru_send hadn't been executed - nothing had been sent
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* to the socket yet.
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*/
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MPASS((curthread->td_pflags & TDP_KTHREAD) == 0);
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free(sfio, M_SENDFILE);
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return;
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}
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#if defined(KERN_TLS) && defined(INVARIANTS)
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if ((sfio->m->m_flags & M_EXTPG) != 0)
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KASSERT(sfio->tls == sfio->m->m_epg_tls,
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("TLS session mismatch"));
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else
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KASSERT(sfio->tls == NULL,
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("non-ext_pgs mbuf with TLS session"));
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#endif
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so = sfio->so;
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CURVNET_SET(so->so_vnet);
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if (__predict_false(sfio->error)) {
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/*
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* I/O operation failed. The state of data in the socket
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* is now inconsistent, and all what we can do is to tear
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* it down. Protocol abort method would tear down protocol
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* state, free all ready mbufs and detach not ready ones.
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* We will free the mbufs corresponding to this I/O manually.
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*
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* The socket would be marked with EIO and made available
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* for read, so that application receives EIO on next
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* syscall and eventually closes the socket.
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*/
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so->so_proto->pr_usrreqs->pru_abort(so);
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so->so_error = EIO;
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mb_free_notready(sfio->m, sfio->npages);
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#ifdef KERN_TLS
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} else if (sfio->tls != NULL && sfio->tls->mode == TCP_TLS_MODE_SW) {
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/*
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* I/O operation is complete, but we still need to
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* encrypt. We cannot do this in the interrupt thread
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* of the disk controller, so forward the mbufs to a
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* different thread.
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*
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* Donate the socket reference from sfio to rather
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* than explicitly invoking soref().
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*/
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ktls_enqueue(sfio->m, so, sfio->npages);
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goto out_with_ref;
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#endif
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} else
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(void)(so->so_proto->pr_usrreqs->pru_ready)(so, sfio->m,
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sfio->npages);
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SOCK_LOCK(so);
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sorele(so);
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#ifdef KERN_TLS
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out_with_ref:
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#endif
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CURVNET_RESTORE();
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free(sfio, M_SENDFILE);
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}
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/*
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* Iterate through pages vector and request paging for non-valid pages.
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*/
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static int
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sendfile_swapin(vm_object_t obj, struct sf_io *sfio, int *nios, off_t off,
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off_t len, int rhpages, int flags)
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{
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vm_page_t *pa;
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int a, count, count1, grabbed, i, j, npages, rv;
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pa = sfio->pa;
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npages = sfio->npages;
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*nios = 0;
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flags = (flags & SF_NODISKIO) ? VM_ALLOC_NOWAIT : 0;
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sfio->pindex0 = OFF_TO_IDX(off);
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|
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/*
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* First grab all the pages and wire them. Note that we grab
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* only required pages. Readahead pages are dealt with later.
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*/
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grabbed = vm_page_grab_pages_unlocked(obj, OFF_TO_IDX(off),
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VM_ALLOC_NORMAL | VM_ALLOC_WIRED | flags, pa, npages);
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if (grabbed < npages) {
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for (int i = grabbed; i < npages; i++)
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pa[i] = NULL;
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npages = grabbed;
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rhpages = 0;
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}
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|
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for (i = 0; i < npages;) {
|
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/* Skip valid pages. */
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if (vm_page_is_valid(pa[i], vmoff(i, off) & PAGE_MASK,
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xfsize(i, npages, off, len))) {
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vm_page_xunbusy(pa[i]);
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SFSTAT_INC(sf_pages_valid);
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i++;
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continue;
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}
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|
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/*
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* Next page is invalid. Check if it belongs to pager. It
|
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* may not be there, which is a regular situation for shmem
|
|
* pager. For vnode pager this happens only in case of
|
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* a sparse file.
|
|
*
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|
* Important feature of vm_pager_has_page() is the hint
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|
* stored in 'a', about how many pages we can pagein after
|
|
* this page in a single I/O.
|
|
*/
|
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VM_OBJECT_RLOCK(obj);
|
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if (!vm_pager_has_page(obj, OFF_TO_IDX(vmoff(i, off)), NULL,
|
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&a)) {
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VM_OBJECT_RUNLOCK(obj);
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pmap_zero_page(pa[i]);
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vm_page_valid(pa[i]);
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MPASS(pa[i]->dirty == 0);
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vm_page_xunbusy(pa[i]);
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i++;
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continue;
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}
|
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VM_OBJECT_RUNLOCK(obj);
|
|
|
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/*
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|
* We want to pagein as many pages as possible, limited only
|
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* by the 'a' hint and actual request.
|
|
*/
|
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count = min(a + 1, npages - i);
|
|
|
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/*
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|
* We should not pagein into a valid page because
|
|
* there might be still unfinished write tracked by
|
|
* e.g. a buffer, thus we substitute any valid pages
|
|
* with the bogus one.
|
|
*
|
|
* We must not leave around xbusy pages which are not
|
|
* part of the run passed to vm_pager_getpages(),
|
|
* otherwise pager might deadlock waiting for the busy
|
|
* status of the page, e.g. if it constitues the
|
|
* buffer needed to validate other page.
|
|
*
|
|
* First trim the end of the run consisting of the
|
|
* valid pages, then replace the rest of the valid
|
|
* with bogus.
|
|
*/
|
|
count1 = count;
|
|
for (j = i + count - 1; j > i; j--) {
|
|
if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
|
|
xfsize(j, npages, off, len))) {
|
|
vm_page_xunbusy(pa[j]);
|
|
SFSTAT_INC(sf_pages_valid);
|
|
count--;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The last page in the run pa[i + count - 1] is
|
|
* guaranteed to be invalid by the trim above, so it
|
|
* is not replaced with bogus, thus -1 in the loop end
|
|
* condition.
|
|
*/
|
|
MPASS(pa[i + count - 1]->valid != VM_PAGE_BITS_ALL);
|
|
for (j = i + 1; j < i + count - 1; j++) {
|
|
if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
|
|
xfsize(j, npages, off, len))) {
|
|
vm_page_xunbusy(pa[j]);
|
|
SFSTAT_INC(sf_pages_valid);
|
|
SFSTAT_INC(sf_pages_bogus);
|
|
pa[j] = bogus_page;
|
|
}
|
|
}
|
|
|
|
refcount_acquire(&sfio->nios);
|
|
rv = vm_pager_get_pages_async(obj, pa + i, count, NULL,
|
|
i + count == npages ? &rhpages : NULL,
|
|
&sendfile_iodone, sfio);
|
|
if (__predict_false(rv != VM_PAGER_OK)) {
|
|
sendfile_iowait(sfio, "sferrio");
|
|
|
|
/*
|
|
* Do remaining pages recovery before returning EIO.
|
|
* Pages from 0 to npages are wired.
|
|
* Pages from (i + count1) to npages are busied.
|
|
*/
|
|
for (j = 0; j < npages; j++) {
|
|
if (j >= i + count1)
|
|
vm_page_xunbusy(pa[j]);
|
|
KASSERT(pa[j] != NULL && pa[j] != bogus_page,
|
|
("%s: page %p[%d] I/O recovery failure",
|
|
__func__, pa, j));
|
|
vm_page_unwire(pa[j], PQ_INACTIVE);
|
|
pa[j] = NULL;
|
|
}
|
|
return (EIO);
|
|
}
|
|
|
|
SFSTAT_INC(sf_iocnt);
|
|
SFSTAT_ADD(sf_pages_read, count);
|
|
if (i + count == npages)
|
|
SFSTAT_ADD(sf_rhpages_read, rhpages);
|
|
|
|
i += count1;
|
|
(*nios)++;
|
|
}
|
|
|
|
if (*nios == 0 && npages != 0)
|
|
SFSTAT_INC(sf_noiocnt);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
sendfile_getobj(struct thread *td, struct file *fp, vm_object_t *obj_res,
|
|
struct vnode **vp_res, struct shmfd **shmfd_res, off_t *obj_size,
|
|
int *bsize)
|
|
{
|
|
struct vattr va;
|
|
vm_object_t obj;
|
|
struct vnode *vp;
|
|
struct shmfd *shmfd;
|
|
int error;
|
|
|
|
error = 0;
|
|
vp = *vp_res = NULL;
|
|
obj = NULL;
|
|
shmfd = *shmfd_res = NULL;
|
|
*bsize = 0;
|
|
|
|
/*
|
|
* The file descriptor must be a regular file and have a
|
|
* backing VM object.
|
|
*/
|
|
if (fp->f_type == DTYPE_VNODE) {
|
|
vp = fp->f_vnode;
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
if (vp->v_type != VREG) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
*bsize = vp->v_mount->mnt_stat.f_iosize;
|
|
obj = vp->v_object;
|
|
if (obj == NULL) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Use the pager size when available to simplify synchronization
|
|
* with filesystems, which otherwise must atomically update both
|
|
* the vnode pager size and file size.
|
|
*/
|
|
if (obj->type == OBJT_VNODE) {
|
|
VM_OBJECT_RLOCK(obj);
|
|
*obj_size = obj->un_pager.vnp.vnp_size;
|
|
} else {
|
|
error = VOP_GETATTR(vp, &va, td->td_ucred);
|
|
if (error != 0)
|
|
goto out;
|
|
*obj_size = va.va_size;
|
|
VM_OBJECT_RLOCK(obj);
|
|
}
|
|
} else if (fp->f_type == DTYPE_SHM) {
|
|
shmfd = fp->f_data;
|
|
obj = shmfd->shm_object;
|
|
VM_OBJECT_RLOCK(obj);
|
|
*obj_size = shmfd->shm_size;
|
|
} else {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if ((obj->flags & OBJ_DEAD) != 0) {
|
|
VM_OBJECT_RUNLOCK(obj);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Temporarily increase the backing VM object's reference
|
|
* count so that a forced reclamation of its vnode does not
|
|
* immediately destroy it.
|
|
*/
|
|
vm_object_reference_locked(obj);
|
|
VM_OBJECT_RUNLOCK(obj);
|
|
*obj_res = obj;
|
|
*vp_res = vp;
|
|
*shmfd_res = shmfd;
|
|
|
|
out:
|
|
if (vp != NULL)
|
|
VOP_UNLOCK(vp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
sendfile_getsock(struct thread *td, int s, struct file **sock_fp,
|
|
struct socket **so)
|
|
{
|
|
int error;
|
|
|
|
*sock_fp = NULL;
|
|
*so = NULL;
|
|
|
|
/*
|
|
* The socket must be a stream socket and connected.
|
|
*/
|
|
error = getsock_cap(td, s, &cap_send_rights,
|
|
sock_fp, NULL, NULL);
|
|
if (error != 0)
|
|
return (error);
|
|
*so = (*sock_fp)->f_data;
|
|
if ((*so)->so_type != SOCK_STREAM)
|
|
return (EINVAL);
|
|
/*
|
|
* SCTP one-to-one style sockets currently don't work with
|
|
* sendfile(). So indicate EINVAL for now.
|
|
*/
|
|
if ((*so)->so_proto->pr_protocol == IPPROTO_SCTP)
|
|
return (EINVAL);
|
|
if (SOLISTENING(*so))
|
|
return (ENOTCONN);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
vn_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
|
|
struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
|
|
struct thread *td)
|
|
{
|
|
struct file *sock_fp;
|
|
struct vnode *vp;
|
|
struct vm_object *obj;
|
|
vm_page_t pga;
|
|
struct socket *so;
|
|
#ifdef KERN_TLS
|
|
struct ktls_session *tls;
|
|
#endif
|
|
struct mbuf *m, *mh, *mhtail;
|
|
struct sf_buf *sf;
|
|
struct shmfd *shmfd;
|
|
struct sendfile_sync *sfs;
|
|
struct vattr va;
|
|
off_t off, sbytes, rem, obj_size, nobj_size;
|
|
int bsize, error, ext_pgs_idx, hdrlen, max_pgs, softerr;
|
|
#ifdef KERN_TLS
|
|
int tls_enq_cnt;
|
|
#endif
|
|
bool use_ext_pgs;
|
|
|
|
obj = NULL;
|
|
so = NULL;
|
|
m = mh = NULL;
|
|
sfs = NULL;
|
|
#ifdef KERN_TLS
|
|
tls = NULL;
|
|
#endif
|
|
hdrlen = sbytes = 0;
|
|
softerr = 0;
|
|
use_ext_pgs = false;
|
|
|
|
error = sendfile_getobj(td, fp, &obj, &vp, &shmfd, &obj_size, &bsize);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
error = sendfile_getsock(td, sockfd, &sock_fp, &so);
|
|
if (error != 0)
|
|
goto out;
|
|
|
|
#ifdef MAC
|
|
error = mac_socket_check_send(td->td_ucred, so);
|
|
if (error != 0)
|
|
goto out;
|
|
#endif
|
|
|
|
SFSTAT_INC(sf_syscalls);
|
|
SFSTAT_ADD(sf_rhpages_requested, SF_READAHEAD(flags));
|
|
|
|
if (flags & SF_SYNC) {
|
|
sfs = malloc(sizeof(*sfs), M_SENDFILE, M_WAITOK | M_ZERO);
|
|
mtx_init(&sfs->mtx, "sendfile", NULL, MTX_DEF);
|
|
cv_init(&sfs->cv, "sendfile");
|
|
sfs->waiting = true;
|
|
}
|
|
|
|
rem = nbytes ? omin(nbytes, obj_size - offset) : obj_size - offset;
|
|
|
|
/*
|
|
* Protect against multiple writers to the socket.
|
|
*
|
|
* XXXRW: Historically this has assumed non-interruptibility, so now
|
|
* we implement that, but possibly shouldn't.
|
|
*/
|
|
error = SOCK_IO_SEND_LOCK(so, SBL_WAIT | SBL_NOINTR);
|
|
if (error != 0)
|
|
goto out;
|
|
#ifdef KERN_TLS
|
|
tls = ktls_hold(so->so_snd.sb_tls_info);
|
|
#endif
|
|
|
|
/*
|
|
* Loop through the pages of the file, starting with the requested
|
|
* offset. Get a file page (do I/O if necessary), map the file page
|
|
* into an sf_buf, attach an mbuf header to the sf_buf, and queue
|
|
* it on the socket.
|
|
* This is done in two loops. The inner loop turns as many pages
|
|
* as it can, up to available socket buffer space, without blocking
|
|
* into mbufs to have it bulk delivered into the socket send buffer.
|
|
* The outer loop checks the state and available space of the socket
|
|
* and takes care of the overall progress.
|
|
*/
|
|
for (off = offset; rem > 0; ) {
|
|
struct sf_io *sfio;
|
|
vm_page_t *pa;
|
|
struct mbuf *m0, *mtail;
|
|
int nios, space, npages, rhpages;
|
|
|
|
mtail = NULL;
|
|
/*
|
|
* Check the socket state for ongoing connection,
|
|
* no errors and space in socket buffer.
|
|
* If space is low allow for the remainder of the
|
|
* file to be processed if it fits the socket buffer.
|
|
* Otherwise block in waiting for sufficient space
|
|
* to proceed, or if the socket is nonblocking, return
|
|
* to userland with EAGAIN while reporting how far
|
|
* we've come.
|
|
* We wait until the socket buffer has significant free
|
|
* space to do bulk sends. This makes good use of file
|
|
* system read ahead and allows packet segmentation
|
|
* offloading hardware to take over lots of work. If
|
|
* we were not careful here we would send off only one
|
|
* sfbuf at a time.
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2)
|
|
so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2;
|
|
retry_space:
|
|
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
|
error = EPIPE;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
goto done;
|
|
} else if (so->so_error) {
|
|
error = so->so_error;
|
|
so->so_error = 0;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
goto done;
|
|
}
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
error = ENOTCONN;
|
|
goto done;
|
|
}
|
|
|
|
space = sbspace(&so->so_snd);
|
|
if (space < rem &&
|
|
(space <= 0 ||
|
|
space < so->so_snd.sb_lowat)) {
|
|
if (so->so_state & SS_NBIO) {
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
error = EAGAIN;
|
|
goto done;
|
|
}
|
|
/*
|
|
* sbwait drops the lock while sleeping.
|
|
* When we loop back to retry_space the
|
|
* state may have changed and we retest
|
|
* for it.
|
|
*/
|
|
error = sbwait(&so->so_snd);
|
|
/*
|
|
* An error from sbwait usually indicates that we've
|
|
* been interrupted by a signal. If we've sent anything
|
|
* then return bytes sent, otherwise return the error.
|
|
*/
|
|
if (error != 0) {
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
goto done;
|
|
}
|
|
goto retry_space;
|
|
}
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
|
|
/*
|
|
* At the beginning of the first loop check if any headers
|
|
* are specified and copy them into mbufs. Reduce space in
|
|
* the socket buffer by the size of the header mbuf chain.
|
|
* Clear hdr_uio here and hdrlen at the end of the first loop.
|
|
*/
|
|
if (hdr_uio != NULL && hdr_uio->uio_resid > 0) {
|
|
hdr_uio->uio_td = td;
|
|
hdr_uio->uio_rw = UIO_WRITE;
|
|
#ifdef KERN_TLS
|
|
if (tls != NULL)
|
|
mh = m_uiotombuf(hdr_uio, M_WAITOK, space,
|
|
tls->params.max_frame_len, M_EXTPG);
|
|
else
|
|
#endif
|
|
mh = m_uiotombuf(hdr_uio, M_WAITOK,
|
|
space, 0, 0);
|
|
hdrlen = m_length(mh, &mhtail);
|
|
space -= hdrlen;
|
|
/*
|
|
* If header consumed all the socket buffer space,
|
|
* don't waste CPU cycles and jump to the end.
|
|
*/
|
|
if (space == 0) {
|
|
sfio = NULL;
|
|
nios = 0;
|
|
goto prepend_header;
|
|
}
|
|
hdr_uio = NULL;
|
|
}
|
|
|
|
if (vp != NULL) {
|
|
error = vn_lock(vp, LK_SHARED);
|
|
if (error != 0)
|
|
goto done;
|
|
|
|
/*
|
|
* Check to see if the file size has changed.
|
|
*/
|
|
if (obj->type == OBJT_VNODE) {
|
|
VM_OBJECT_RLOCK(obj);
|
|
nobj_size = obj->un_pager.vnp.vnp_size;
|
|
VM_OBJECT_RUNLOCK(obj);
|
|
} else {
|
|
error = VOP_GETATTR(vp, &va, td->td_ucred);
|
|
if (error != 0) {
|
|
VOP_UNLOCK(vp);
|
|
goto done;
|
|
}
|
|
nobj_size = va.va_size;
|
|
}
|
|
if (off >= nobj_size) {
|
|
VOP_UNLOCK(vp);
|
|
goto done;
|
|
}
|
|
if (nobj_size != obj_size) {
|
|
obj_size = nobj_size;
|
|
rem = nbytes ? omin(nbytes + offset, obj_size) :
|
|
obj_size;
|
|
rem -= off;
|
|
}
|
|
}
|
|
|
|
if (space > rem)
|
|
space = rem;
|
|
else if (space > PAGE_SIZE) {
|
|
/*
|
|
* Use page boundaries when possible for large
|
|
* requests.
|
|
*/
|
|
if (off & PAGE_MASK)
|
|
space -= (PAGE_SIZE - (off & PAGE_MASK));
|
|
space = trunc_page(space);
|
|
if (off & PAGE_MASK)
|
|
space += (PAGE_SIZE - (off & PAGE_MASK));
|
|
}
|
|
|
|
npages = howmany(space + (off & PAGE_MASK), PAGE_SIZE);
|
|
|
|
/*
|
|
* Calculate maximum allowed number of pages for readahead
|
|
* at this iteration. If SF_USER_READAHEAD was set, we don't
|
|
* do any heuristics and use exactly the value supplied by
|
|
* application. Otherwise, we allow readahead up to "rem".
|
|
* If application wants more, let it be, but there is no
|
|
* reason to go above maxphys. Also check against "obj_size",
|
|
* since vm_pager_has_page() can hint beyond EOF.
|
|
*/
|
|
if (flags & SF_USER_READAHEAD) {
|
|
rhpages = SF_READAHEAD(flags);
|
|
} else {
|
|
rhpages = howmany(rem + (off & PAGE_MASK), PAGE_SIZE) -
|
|
npages;
|
|
rhpages += SF_READAHEAD(flags);
|
|
}
|
|
rhpages = min(howmany(maxphys, PAGE_SIZE), rhpages);
|
|
rhpages = min(howmany(obj_size - trunc_page(off), PAGE_SIZE) -
|
|
npages, rhpages);
|
|
|
|
sfio = malloc(sizeof(struct sf_io) +
|
|
npages * sizeof(vm_page_t), M_SENDFILE, M_WAITOK);
|
|
refcount_init(&sfio->nios, 1);
|
|
sfio->obj = obj;
|
|
sfio->error = 0;
|
|
sfio->m = NULL;
|
|
sfio->npages = npages;
|
|
#ifdef KERN_TLS
|
|
/*
|
|
* This doesn't use ktls_hold() because sfio->m will
|
|
* also have a reference on 'tls' that will be valid
|
|
* for all of sfio's lifetime.
|
|
*/
|
|
sfio->tls = tls;
|
|
#endif
|
|
vm_object_pip_add(obj, 1);
|
|
error = sendfile_swapin(obj, sfio, &nios, off, space, rhpages,
|
|
flags);
|
|
if (error != 0) {
|
|
if (vp != NULL)
|
|
VOP_UNLOCK(vp);
|
|
sendfile_iodone(sfio, NULL, 0, error);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Loop and construct maximum sized mbuf chain to be bulk
|
|
* dumped into socket buffer.
|
|
*/
|
|
pa = sfio->pa;
|
|
|
|
/*
|
|
* Use unmapped mbufs if enabled for TCP. Unmapped
|
|
* bufs are restricted to TCP as that is what has been
|
|
* tested. In particular, unmapped mbufs have not
|
|
* been tested with UNIX-domain sockets.
|
|
*
|
|
* TLS frames always require unmapped mbufs.
|
|
*/
|
|
if ((mb_use_ext_pgs &&
|
|
so->so_proto->pr_protocol == IPPROTO_TCP)
|
|
#ifdef KERN_TLS
|
|
|| tls != NULL
|
|
#endif
|
|
) {
|
|
use_ext_pgs = true;
|
|
#ifdef KERN_TLS
|
|
if (tls != NULL)
|
|
max_pgs = num_pages(tls->params.max_frame_len);
|
|
else
|
|
#endif
|
|
max_pgs = MBUF_PEXT_MAX_PGS;
|
|
|
|
/* Start at last index, to wrap on first use. */
|
|
ext_pgs_idx = max_pgs - 1;
|
|
}
|
|
|
|
for (int i = 0; i < npages; i++) {
|
|
/*
|
|
* If a page wasn't grabbed successfully, then
|
|
* trim the array. Can happen only with SF_NODISKIO.
|
|
*/
|
|
if (pa[i] == NULL) {
|
|
SFSTAT_INC(sf_busy);
|
|
fixspace(npages, i, off, &space);
|
|
sfio->npages = i;
|
|
softerr = EBUSY;
|
|
break;
|
|
}
|
|
pga = pa[i];
|
|
if (pga == bogus_page)
|
|
pga = vm_page_relookup(obj, sfio->pindex0 + i);
|
|
|
|
if (use_ext_pgs) {
|
|
off_t xfs;
|
|
|
|
ext_pgs_idx++;
|
|
if (ext_pgs_idx == max_pgs) {
|
|
m0 = mb_alloc_ext_pgs(M_WAITOK,
|
|
sendfile_free_mext_pg);
|
|
|
|
if (flags & SF_NOCACHE) {
|
|
m0->m_ext.ext_flags |=
|
|
EXT_FLAG_NOCACHE;
|
|
|
|
/*
|
|
* See comment below regarding
|
|
* ignoring SF_NOCACHE for the
|
|
* last page.
|
|
*/
|
|
if ((npages - i <= max_pgs) &&
|
|
((off + space) & PAGE_MASK) &&
|
|
(rem > space || rhpages > 0))
|
|
m0->m_ext.ext_flags |=
|
|
EXT_FLAG_CACHE_LAST;
|
|
}
|
|
if (sfs != NULL) {
|
|
m0->m_ext.ext_flags |=
|
|
EXT_FLAG_SYNC;
|
|
m0->m_ext.ext_arg1 = sfs;
|
|
mtx_lock(&sfs->mtx);
|
|
sfs->count++;
|
|
mtx_unlock(&sfs->mtx);
|
|
}
|
|
ext_pgs_idx = 0;
|
|
|
|
/* Append to mbuf chain. */
|
|
if (mtail != NULL)
|
|
mtail->m_next = m0;
|
|
else
|
|
m = m0;
|
|
mtail = m0;
|
|
m0->m_epg_1st_off =
|
|
vmoff(i, off) & PAGE_MASK;
|
|
}
|
|
if (nios) {
|
|
mtail->m_flags |= M_NOTREADY;
|
|
m0->m_epg_nrdy++;
|
|
}
|
|
|
|
m0->m_epg_pa[ext_pgs_idx] = VM_PAGE_TO_PHYS(pga);
|
|
m0->m_epg_npgs++;
|
|
xfs = xfsize(i, npages, off, space);
|
|
m0->m_epg_last_len = xfs;
|
|
MBUF_EXT_PGS_ASSERT_SANITY(m0);
|
|
mtail->m_len += xfs;
|
|
mtail->m_ext.ext_size += PAGE_SIZE;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Get a sendfile buf. When allocating the
|
|
* first buffer for mbuf chain, we usually
|
|
* wait as long as necessary, but this wait
|
|
* can be interrupted. For consequent
|
|
* buffers, do not sleep, since several
|
|
* threads might exhaust the buffers and then
|
|
* deadlock.
|
|
*/
|
|
sf = sf_buf_alloc(pga,
|
|
m != NULL ? SFB_NOWAIT : SFB_CATCH);
|
|
if (sf == NULL) {
|
|
SFSTAT_INC(sf_allocfail);
|
|
sendfile_iowait(sfio, "sfnosf");
|
|
for (int j = i; j < npages; j++) {
|
|
vm_page_unwire(pa[j], PQ_INACTIVE);
|
|
pa[j] = NULL;
|
|
}
|
|
if (m == NULL)
|
|
softerr = ENOBUFS;
|
|
fixspace(npages, i, off, &space);
|
|
sfio->npages = i;
|
|
break;
|
|
}
|
|
|
|
m0 = m_get(M_WAITOK, MT_DATA);
|
|
m0->m_ext.ext_buf = (char *)sf_buf_kva(sf);
|
|
m0->m_ext.ext_size = PAGE_SIZE;
|
|
m0->m_ext.ext_arg1 = sf;
|
|
m0->m_ext.ext_type = EXT_SFBUF;
|
|
m0->m_ext.ext_flags = EXT_FLAG_EMBREF;
|
|
m0->m_ext.ext_free = sendfile_free_mext;
|
|
/*
|
|
* SF_NOCACHE sets the page as being freed upon send.
|
|
* However, we ignore it for the last page in 'space',
|
|
* if the page is truncated, and we got more data to
|
|
* send (rem > space), or if we have readahead
|
|
* configured (rhpages > 0).
|
|
*/
|
|
if ((flags & SF_NOCACHE) &&
|
|
(i != npages - 1 ||
|
|
!((off + space) & PAGE_MASK) ||
|
|
!(rem > space || rhpages > 0)))
|
|
m0->m_ext.ext_flags |= EXT_FLAG_NOCACHE;
|
|
if (sfs != NULL) {
|
|
m0->m_ext.ext_flags |= EXT_FLAG_SYNC;
|
|
m0->m_ext.ext_arg2 = sfs;
|
|
mtx_lock(&sfs->mtx);
|
|
sfs->count++;
|
|
mtx_unlock(&sfs->mtx);
|
|
}
|
|
m0->m_ext.ext_count = 1;
|
|
m0->m_flags |= (M_EXT | M_RDONLY);
|
|
if (nios)
|
|
m0->m_flags |= M_NOTREADY;
|
|
m0->m_data = (char *)sf_buf_kva(sf) +
|
|
(vmoff(i, off) & PAGE_MASK);
|
|
m0->m_len = xfsize(i, npages, off, space);
|
|
|
|
/* Append to mbuf chain. */
|
|
if (mtail != NULL)
|
|
mtail->m_next = m0;
|
|
else
|
|
m = m0;
|
|
mtail = m0;
|
|
}
|
|
|
|
if (vp != NULL)
|
|
VOP_UNLOCK(vp);
|
|
|
|
/* Keep track of bytes processed. */
|
|
off += space;
|
|
rem -= space;
|
|
|
|
/*
|
|
* Prepend header, if any. Save pointer to first mbuf
|
|
* with a page.
|
|
*/
|
|
if (hdrlen) {
|
|
prepend_header:
|
|
m0 = mhtail->m_next = m;
|
|
m = mh;
|
|
mh = NULL;
|
|
} else
|
|
m0 = m;
|
|
|
|
if (m == NULL) {
|
|
KASSERT(softerr, ("%s: m NULL, no error", __func__));
|
|
error = softerr;
|
|
sendfile_iodone(sfio, NULL, 0, 0);
|
|
goto done;
|
|
}
|
|
|
|
/* Add the buffer chain to the socket buffer. */
|
|
KASSERT(m_length(m, NULL) == space + hdrlen,
|
|
("%s: mlen %u space %d hdrlen %d",
|
|
__func__, m_length(m, NULL), space, hdrlen));
|
|
|
|
CURVNET_SET(so->so_vnet);
|
|
#ifdef KERN_TLS
|
|
if (tls != NULL)
|
|
ktls_frame(m, tls, &tls_enq_cnt, TLS_RLTYPE_APP);
|
|
#endif
|
|
if (nios == 0) {
|
|
/*
|
|
* If sendfile_swapin() didn't initiate any I/Os,
|
|
* which happens if all data is cached in VM, or if
|
|
* the header consumed all socket buffer space and
|
|
* sfio is NULL, then we can send data right now
|
|
* without the PRUS_NOTREADY flag.
|
|
*/
|
|
if (sfio != NULL)
|
|
sendfile_iodone(sfio, NULL, 0, 0);
|
|
#ifdef KERN_TLS
|
|
if (tls != NULL && tls->mode == TCP_TLS_MODE_SW) {
|
|
error = (*so->so_proto->pr_usrreqs->pru_send)
|
|
(so, PRUS_NOTREADY, m, NULL, NULL, td);
|
|
if (error != 0) {
|
|
m_freem(m);
|
|
} else {
|
|
soref(so);
|
|
ktls_enqueue(m, so, tls_enq_cnt);
|
|
}
|
|
} else
|
|
#endif
|
|
error = (*so->so_proto->pr_usrreqs->pru_send)
|
|
(so, 0, m, NULL, NULL, td);
|
|
} else {
|
|
sfio->so = so;
|
|
sfio->m = m0;
|
|
soref(so);
|
|
error = (*so->so_proto->pr_usrreqs->pru_send)
|
|
(so, PRUS_NOTREADY, m, NULL, NULL, td);
|
|
sendfile_iodone(sfio, NULL, 0, error);
|
|
}
|
|
CURVNET_RESTORE();
|
|
|
|
m = NULL;
|
|
if (error)
|
|
goto done;
|
|
sbytes += space + hdrlen;
|
|
if (hdrlen)
|
|
hdrlen = 0;
|
|
if (softerr) {
|
|
error = softerr;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send trailers. Wimp out and use writev(2).
|
|
*/
|
|
if (trl_uio != NULL) {
|
|
SOCK_IO_SEND_UNLOCK(so);
|
|
error = kern_writev(td, sockfd, trl_uio);
|
|
if (error == 0)
|
|
sbytes += td->td_retval[0];
|
|
goto out;
|
|
}
|
|
|
|
done:
|
|
SOCK_IO_SEND_UNLOCK(so);
|
|
out:
|
|
/*
|
|
* If there was no error we have to clear td->td_retval[0]
|
|
* because it may have been set by writev.
|
|
*/
|
|
if (error == 0) {
|
|
td->td_retval[0] = 0;
|
|
}
|
|
if (sent != NULL) {
|
|
(*sent) = sbytes;
|
|
}
|
|
if (obj != NULL)
|
|
vm_object_deallocate(obj);
|
|
if (so)
|
|
fdrop(sock_fp, td);
|
|
if (m)
|
|
m_freem(m);
|
|
if (mh)
|
|
m_freem(mh);
|
|
|
|
if (sfs != NULL) {
|
|
mtx_lock(&sfs->mtx);
|
|
if (sfs->count != 0)
|
|
error = cv_wait_sig(&sfs->cv, &sfs->mtx);
|
|
if (sfs->count == 0) {
|
|
sendfile_sync_destroy(sfs);
|
|
} else {
|
|
sfs->waiting = false;
|
|
mtx_unlock(&sfs->mtx);
|
|
}
|
|
}
|
|
#ifdef KERN_TLS
|
|
if (tls != NULL)
|
|
ktls_free(tls);
|
|
#endif
|
|
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
sendfile(struct thread *td, struct sendfile_args *uap, int compat)
|
|
{
|
|
struct sf_hdtr hdtr;
|
|
struct uio *hdr_uio, *trl_uio;
|
|
struct file *fp;
|
|
off_t sbytes;
|
|
int error;
|
|
|
|
/*
|
|
* File offset must be positive. If it goes beyond EOF
|
|
* we send only the header/trailer and no payload data.
|
|
*/
|
|
if (uap->offset < 0)
|
|
return (EINVAL);
|
|
|
|
sbytes = 0;
|
|
hdr_uio = trl_uio = NULL;
|
|
|
|
if (uap->hdtr != NULL) {
|
|
error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
|
|
if (error != 0)
|
|
goto out;
|
|
if (hdtr.headers != NULL) {
|
|
error = copyinuio(hdtr.headers, hdtr.hdr_cnt,
|
|
&hdr_uio);
|
|
if (error != 0)
|
|
goto out;
|
|
#ifdef COMPAT_FREEBSD4
|
|
/*
|
|
* In FreeBSD < 5.0 the nbytes to send also included
|
|
* the header. If compat is specified subtract the
|
|
* header size from nbytes.
|
|
*/
|
|
if (compat) {
|
|
if (uap->nbytes > hdr_uio->uio_resid)
|
|
uap->nbytes -= hdr_uio->uio_resid;
|
|
else
|
|
uap->nbytes = 0;
|
|
}
|
|
#endif
|
|
}
|
|
if (hdtr.trailers != NULL) {
|
|
error = copyinuio(hdtr.trailers, hdtr.trl_cnt,
|
|
&trl_uio);
|
|
if (error != 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
AUDIT_ARG_FD(uap->fd);
|
|
|
|
/*
|
|
* sendfile(2) can start at any offset within a file so we require
|
|
* CAP_READ+CAP_SEEK = CAP_PREAD.
|
|
*/
|
|
if ((error = fget_read(td, uap->fd, &cap_pread_rights, &fp)) != 0)
|
|
goto out;
|
|
|
|
error = fo_sendfile(fp, uap->s, hdr_uio, trl_uio, uap->offset,
|
|
uap->nbytes, &sbytes, uap->flags, td);
|
|
fdrop(fp, td);
|
|
|
|
if (uap->sbytes != NULL)
|
|
copyout(&sbytes, uap->sbytes, sizeof(off_t));
|
|
|
|
out:
|
|
free(hdr_uio, M_IOV);
|
|
free(trl_uio, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* sendfile(2)
|
|
*
|
|
* int sendfile(int fd, int s, off_t offset, size_t nbytes,
|
|
* struct sf_hdtr *hdtr, off_t *sbytes, int flags)
|
|
*
|
|
* Send a file specified by 'fd' and starting at 'offset' to a socket
|
|
* specified by 's'. Send only 'nbytes' of the file or until EOF if nbytes ==
|
|
* 0. Optionally add a header and/or trailer to the socket output. If
|
|
* specified, write the total number of bytes sent into *sbytes.
|
|
*/
|
|
int
|
|
sys_sendfile(struct thread *td, struct sendfile_args *uap)
|
|
{
|
|
|
|
return (sendfile(td, uap, 0));
|
|
}
|
|
|
|
#ifdef COMPAT_FREEBSD4
|
|
int
|
|
freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap)
|
|
{
|
|
struct sendfile_args args;
|
|
|
|
args.fd = uap->fd;
|
|
args.s = uap->s;
|
|
args.offset = uap->offset;
|
|
args.nbytes = uap->nbytes;
|
|
args.hdtr = uap->hdtr;
|
|
args.sbytes = uap->sbytes;
|
|
args.flags = uap->flags;
|
|
|
|
return (sendfile(td, &args, 1));
|
|
}
|
|
#endif /* COMPAT_FREEBSD4 */
|