2 * Copyright (c) 2013-2015 Gleb Smirnoff <glebius@FreeBSD.org>
3 * Copyright (c) 1998, David Greenman. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include "opt_compat.h"
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/capsicum.h>
38 #include <sys/kernel.h>
40 #include <sys/mutex.h>
41 #include <sys/sysproto.h>
42 #include <sys/malloc.h>
45 #include <sys/mount.h>
47 #include <sys/protosw.h>
48 #include <sys/rwlock.h>
49 #include <sys/sf_buf.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/syscallsubr.h>
53 #include <sys/sysctl.h>
54 #include <sys/vnode.h>
58 #include <security/audit/audit.h>
59 #include <security/mac/mac_framework.h>
62 #include <vm/vm_object.h>
63 #include <vm/vm_pager.h>
65 #define EXT_FLAG_SYNC EXT_FLAG_VENDOR1
66 #define EXT_FLAG_NOCACHE EXT_FLAG_VENDOR2
69 * Structure describing a single sendfile(2) I/O, which may consist of
70 * several underlying pager I/Os.
72 * The syscall context allocates the structure and initializes 'nios'
73 * to 1. As sendfile_swapin() runs through pages and starts asynchronous
74 * paging operations, it increments 'nios'.
76 * Every I/O completion calls sendfile_iodone(), which decrements the 'nios',
77 * and the syscall also calls sendfile_iodone() after allocating all mbufs,
78 * linking them and sending to socket. Whoever reaches zero 'nios' is
79 * responsible to * call pru_ready on the socket, to notify it of readyness
92 * Structure used to track requests with SF_SYNC flag.
94 struct sendfile_sync {
100 counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)];
103 sfstat_init(const void *unused)
106 COUNTER_ARRAY_ALLOC(sfstat, sizeof(struct sfstat) / sizeof(uint64_t),
109 SYSINIT(sfstat, SI_SUB_MBUF, SI_ORDER_FIRST, sfstat_init, NULL);
112 sfstat_sysctl(SYSCTL_HANDLER_ARGS)
116 COUNTER_ARRAY_COPY(sfstat, &s, sizeof(s) / sizeof(uint64_t));
118 COUNTER_ARRAY_ZERO(sfstat, sizeof(s) / sizeof(uint64_t));
119 return (SYSCTL_OUT(req, &s, sizeof(s)));
121 SYSCTL_PROC(_kern_ipc, OID_AUTO, sfstat, CTLTYPE_OPAQUE | CTLFLAG_RW,
122 NULL, 0, sfstat_sysctl, "I", "sendfile statistics");
125 * Detach mapped page and release resources back to the system. Called
126 * by mbuf(9) code when last reference to a page is freed.
129 sendfile_free_page(vm_page_t pg, bool nocache)
134 * In either case check for the object going away on us. This can
135 * happen since we don't hold a reference to it. If so, we're
136 * responsible for freeing the page. In 'noncache' case try to free
137 * the page, but only if it is cheap to.
139 if (vm_page_unwire(pg, nocache ? PQ_NONE : PQ_INACTIVE)) {
142 if ((obj = pg->object) == NULL)
145 if (!vm_page_xbusied(pg) && VM_OBJECT_TRYWLOCK(obj)) {
148 /* Only free unmapped pages. */
149 if (obj->ref_count == 0 ||
150 !pmap_page_is_mapped(pg))
152 * The busy test before the object is
153 * locked cannot be relied upon.
155 freed = vm_page_try_to_free(pg);
158 VM_OBJECT_WUNLOCK(obj);
160 vm_page_deactivate_noreuse(pg);
162 vm_page_deactivate_noreuse(pg);
169 sendfile_free_mext(struct mbuf *m)
175 KASSERT(m->m_flags & M_EXT && m->m_ext.ext_type == EXT_SFBUF,
176 ("%s: m %p !M_EXT or !EXT_SFBUF", __func__, m));
178 sf = m->m_ext.ext_arg1;
179 pg = sf_buf_page(sf);
180 nocache = m->m_ext.ext_flags & EXT_FLAG_NOCACHE;
183 sendfile_free_page(pg, nocache);
185 if (m->m_ext.ext_flags & EXT_FLAG_SYNC) {
186 struct sendfile_sync *sfs = m->m_ext.ext_arg2;
189 KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0"));
190 if (--sfs->count == 0)
192 mtx_unlock(&sfs->mtx);
197 * Helper function to calculate how much data to put into page i of n.
198 * Only first and last pages are special.
201 xfsize(int i, int n, off_t off, off_t len)
205 return (omin(PAGE_SIZE - (off & PAGE_MASK), len));
207 if (i == n - 1 && ((off + len) & PAGE_MASK) > 0)
208 return ((off + len) & PAGE_MASK);
214 * Helper function to get offset within object for i page.
216 static inline vm_ooffset_t
217 vmoff(int i, off_t off)
221 return ((vm_ooffset_t)off);
223 return (trunc_page(off + i * PAGE_SIZE));
227 * Helper function used when allocation of a page or sf_buf failed.
228 * Pretend as if we don't have enough space, subtract xfsize() of
229 * all pages that failed.
232 fixspace(int old, int new, off_t off, int *space)
235 KASSERT(old > new, ("%s: old %d new %d", __func__, old, new));
237 /* Subtract last one. */
238 *space -= xfsize(old - 1, old, off, *space);
242 /* There was only one page. */
245 /* Subtract first one. */
247 *space -= xfsize(0, old, off, *space);
251 /* Rest of pages are full sized. */
252 *space -= (old - new) * PAGE_SIZE;
254 KASSERT(*space >= 0, ("%s: space went backwards", __func__));
258 * I/O completion callback.
261 sendfile_iodone(void *arg, vm_page_t *pg, int count, int error)
263 struct sf_io *sfio = arg;
264 struct socket *so = sfio->so;
266 for (int i = 0; i < count; i++)
267 if (pg[i] != bogus_page)
268 vm_page_xunbusy(pg[i]);
273 if (!refcount_release(&sfio->nios))
280 * I/O operation failed. The state of data in the socket
281 * is now inconsistent, and all what we can do is to tear
282 * it down. Protocol abort method would tear down protocol
283 * state, free all ready mbufs and detach not ready ones.
284 * We will free the mbufs corresponding to this I/O manually.
286 * The socket would be marked with EIO and made available
287 * for read, so that application receives EIO on next
288 * syscall and eventually closes the socket.
290 so->so_proto->pr_usrreqs->pru_abort(so);
294 for (int i = 0; i < sfio->npages; i++)
297 CURVNET_SET(so->so_vnet);
298 (void )(so->so_proto->pr_usrreqs->pru_ready)(so, sfio->m,
309 * Iterate through pages vector and request paging for non-valid pages.
312 sendfile_swapin(vm_object_t obj, struct sf_io *sfio, off_t off, off_t len,
313 int npages, int rhpages, int flags)
315 vm_page_t *pa = sfio->pa;
319 flags = (flags & SF_NODISKIO) ? VM_ALLOC_NOWAIT : 0;
322 * First grab all the pages and wire them. Note that we grab
323 * only required pages. Readahead pages are dealt with later.
325 VM_OBJECT_WLOCK(obj);
327 grabbed = vm_page_grab_pages(obj, OFF_TO_IDX(off),
328 VM_ALLOC_NORMAL | VM_ALLOC_WIRED | flags, pa, npages);
329 if (grabbed < npages) {
330 for (int i = grabbed; i < npages; i++)
336 for (int i = 0; i < npages;) {
339 /* Skip valid pages. */
340 if (vm_page_is_valid(pa[i], vmoff(i, off) & PAGE_MASK,
341 xfsize(i, npages, off, len))) {
342 vm_page_xunbusy(pa[i]);
343 SFSTAT_INC(sf_pages_valid);
349 * Next page is invalid. Check if it belongs to pager. It
350 * may not be there, which is a regular situation for shmem
351 * pager. For vnode pager this happens only in case of
354 * Important feature of vm_pager_has_page() is the hint
355 * stored in 'a', about how many pages we can pagein after
356 * this page in a single I/O.
358 if (!vm_pager_has_page(obj, OFF_TO_IDX(vmoff(i, off)), NULL,
360 pmap_zero_page(pa[i]);
361 pa[i]->valid = VM_PAGE_BITS_ALL;
362 MPASS(pa[i]->dirty == 0);
363 vm_page_xunbusy(pa[i]);
369 * We want to pagein as many pages as possible, limited only
370 * by the 'a' hint and actual request.
372 count = min(a + 1, npages - i);
375 * We should not pagein into a valid page, thus we first trim
376 * any valid pages off the end of request, and substitute
377 * to bogus_page those, that are in the middle.
379 for (j = i + count - 1; j > i; j--) {
380 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
381 xfsize(j, npages, off, len))) {
387 for (j = i + 1; j < i + count - 1; j++)
388 if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK,
389 xfsize(j, npages, off, len))) {
390 vm_page_xunbusy(pa[j]);
391 SFSTAT_INC(sf_pages_valid);
392 SFSTAT_INC(sf_pages_bogus);
396 refcount_acquire(&sfio->nios);
397 rv = vm_pager_get_pages_async(obj, pa + i, count, NULL,
398 i + count == npages ? &rhpages : NULL,
399 &sendfile_iodone, sfio);
400 KASSERT(rv == VM_PAGER_OK, ("%s: pager fail obj %p page %p",
401 __func__, obj, pa[i]));
403 SFSTAT_INC(sf_iocnt);
404 SFSTAT_ADD(sf_pages_read, count);
405 if (i + count == npages)
406 SFSTAT_ADD(sf_rhpages_read, rhpages);
409 * Restore the valid page pointers. They are already
410 * unbusied, but still wired.
412 for (j = i; j < i + count; j++)
413 if (pa[j] == bogus_page) {
414 pa[j] = vm_page_lookup(obj,
415 OFF_TO_IDX(vmoff(j, off)));
416 KASSERT(pa[j], ("%s: page %p[%d] disappeared",
424 VM_OBJECT_WUNLOCK(obj);
426 if (nios == 0 && npages != 0)
427 SFSTAT_INC(sf_noiocnt);
433 sendfile_getobj(struct thread *td, struct file *fp, vm_object_t *obj_res,
434 struct vnode **vp_res, struct shmfd **shmfd_res, off_t *obj_size,
445 shmfd = *shmfd_res = NULL;
449 * The file descriptor must be a regular file and have a
452 if (fp->f_type == DTYPE_VNODE) {
454 vn_lock(vp, LK_SHARED | LK_RETRY);
455 if (vp->v_type != VREG) {
459 *bsize = vp->v_mount->mnt_stat.f_iosize;
460 error = VOP_GETATTR(vp, &va, td->td_ucred);
463 *obj_size = va.va_size;
469 } else if (fp->f_type == DTYPE_SHM) {
472 obj = shmfd->shm_object;
473 *obj_size = shmfd->shm_size;
479 VM_OBJECT_WLOCK(obj);
480 if ((obj->flags & OBJ_DEAD) != 0) {
481 VM_OBJECT_WUNLOCK(obj);
487 * Temporarily increase the backing VM object's reference
488 * count so that a forced reclamation of its vnode does not
489 * immediately destroy it.
491 vm_object_reference_locked(obj);
492 VM_OBJECT_WUNLOCK(obj);
504 sendfile_getsock(struct thread *td, int s, struct file **sock_fp,
514 * The socket must be a stream socket and connected.
516 error = getsock_cap(td, s, cap_rights_init(&rights, CAP_SEND),
517 sock_fp, NULL, NULL);
520 *so = (*sock_fp)->f_data;
521 if ((*so)->so_type != SOCK_STREAM)
527 vn_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
528 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
531 struct file *sock_fp;
533 struct vm_object *obj;
535 struct mbuf *m, *mh, *mhtail;
538 struct sendfile_sync *sfs;
540 off_t off, sbytes, rem, obj_size;
541 int error, softerr, bsize, hdrlen;
550 error = sendfile_getobj(td, fp, &obj, &vp, &shmfd, &obj_size, &bsize);
554 error = sendfile_getsock(td, sockfd, &sock_fp, &so);
559 error = mac_socket_check_send(td->td_ucred, so);
564 SFSTAT_INC(sf_syscalls);
565 SFSTAT_ADD(sf_rhpages_requested, SF_READAHEAD(flags));
567 if (flags & SF_SYNC) {
568 sfs = malloc(sizeof *sfs, M_TEMP, M_WAITOK | M_ZERO);
569 mtx_init(&sfs->mtx, "sendfile", NULL, MTX_DEF);
570 cv_init(&sfs->cv, "sendfile");
573 rem = nbytes ? omin(nbytes, obj_size - offset) : obj_size - offset;
576 * Protect against multiple writers to the socket.
578 * XXXRW: Historically this has assumed non-interruptibility, so now
579 * we implement that, but possibly shouldn't.
581 (void)sblock(&so->so_snd, SBL_WAIT | SBL_NOINTR);
584 * Loop through the pages of the file, starting with the requested
585 * offset. Get a file page (do I/O if necessary), map the file page
586 * into an sf_buf, attach an mbuf header to the sf_buf, and queue
588 * This is done in two loops. The inner loop turns as many pages
589 * as it can, up to available socket buffer space, without blocking
590 * into mbufs to have it bulk delivered into the socket send buffer.
591 * The outer loop checks the state and available space of the socket
592 * and takes care of the overall progress.
594 for (off = offset; rem > 0; ) {
598 int nios, space, npages, rhpages;
602 * Check the socket state for ongoing connection,
603 * no errors and space in socket buffer.
604 * If space is low allow for the remainder of the
605 * file to be processed if it fits the socket buffer.
606 * Otherwise block in waiting for sufficient space
607 * to proceed, or if the socket is nonblocking, return
608 * to userland with EAGAIN while reporting how far
610 * We wait until the socket buffer has significant free
611 * space to do bulk sends. This makes good use of file
612 * system read ahead and allows packet segmentation
613 * offloading hardware to take over lots of work. If
614 * we were not careful here we would send off only one
617 SOCKBUF_LOCK(&so->so_snd);
618 if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2)
619 so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2;
621 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
623 SOCKBUF_UNLOCK(&so->so_snd);
625 } else if (so->so_error) {
626 error = so->so_error;
628 SOCKBUF_UNLOCK(&so->so_snd);
631 if ((so->so_state & SS_ISCONNECTED) == 0) {
632 SOCKBUF_UNLOCK(&so->so_snd);
637 space = sbspace(&so->so_snd);
640 space < so->so_snd.sb_lowat)) {
641 if (so->so_state & SS_NBIO) {
642 SOCKBUF_UNLOCK(&so->so_snd);
647 * sbwait drops the lock while sleeping.
648 * When we loop back to retry_space the
649 * state may have changed and we retest
652 error = sbwait(&so->so_snd);
654 * An error from sbwait usually indicates that we've
655 * been interrupted by a signal. If we've sent anything
656 * then return bytes sent, otherwise return the error.
659 SOCKBUF_UNLOCK(&so->so_snd);
664 SOCKBUF_UNLOCK(&so->so_snd);
667 * At the beginning of the first loop check if any headers
668 * are specified and copy them into mbufs. Reduce space in
669 * the socket buffer by the size of the header mbuf chain.
670 * Clear hdr_uio here and hdrlen at the end of the first loop.
672 if (hdr_uio != NULL && hdr_uio->uio_resid > 0) {
673 hdr_uio->uio_td = td;
674 hdr_uio->uio_rw = UIO_WRITE;
675 mh = m_uiotombuf(hdr_uio, M_WAITOK, space, 0, 0);
676 hdrlen = m_length(mh, &mhtail);
679 * If header consumed all the socket buffer space,
680 * don't waste CPU cycles and jump to the end.
691 error = vn_lock(vp, LK_SHARED);
694 error = VOP_GETATTR(vp, &va, td->td_ucred);
695 if (error != 0 || off >= va.va_size) {
699 if (va.va_size != obj_size) {
700 obj_size = va.va_size;
702 omin(nbytes + offset, obj_size) : obj_size;
710 npages = howmany(space + (off & PAGE_MASK), PAGE_SIZE);
713 * Calculate maximum allowed number of pages for readahead
714 * at this iteration. If SF_USER_READAHEAD was set, we don't
715 * do any heuristics and use exactly the value supplied by
716 * application. Otherwise, we allow readahead up to "rem".
717 * If application wants more, let it be, but there is no
718 * reason to go above MAXPHYS. Also check against "obj_size",
719 * since vm_pager_has_page() can hint beyond EOF.
721 if (flags & SF_USER_READAHEAD) {
722 rhpages = SF_READAHEAD(flags);
724 rhpages = howmany(rem + (off & PAGE_MASK), PAGE_SIZE) -
726 rhpages += SF_READAHEAD(flags);
728 rhpages = min(howmany(MAXPHYS, PAGE_SIZE), rhpages);
729 rhpages = min(howmany(obj_size - trunc_page(off), PAGE_SIZE) -
732 sfio = malloc(sizeof(struct sf_io) +
733 npages * sizeof(vm_page_t), M_TEMP, M_WAITOK);
734 refcount_init(&sfio->nios, 1);
738 nios = sendfile_swapin(obj, sfio, off, space, npages, rhpages,
742 * Loop and construct maximum sized mbuf chain to be bulk
743 * dumped into socket buffer.
746 for (int i = 0; i < npages; i++) {
750 * If a page wasn't grabbed successfully, then
751 * trim the array. Can happen only with SF_NODISKIO.
755 fixspace(npages, i, off, &space);
762 * Get a sendfile buf. When allocating the
763 * first buffer for mbuf chain, we usually
764 * wait as long as necessary, but this wait
765 * can be interrupted. For consequent
766 * buffers, do not sleep, since several
767 * threads might exhaust the buffers and then
770 sf = sf_buf_alloc(pa[i],
771 m != NULL ? SFB_NOWAIT : SFB_CATCH);
773 SFSTAT_INC(sf_allocfail);
774 for (int j = i; j < npages; j++) {
776 vm_page_unwire(pa[j], PQ_INACTIVE);
777 vm_page_unlock(pa[j]);
781 fixspace(npages, i, off, &space);
786 m0 = m_get(M_WAITOK, MT_DATA);
787 m0->m_ext.ext_buf = (char *)sf_buf_kva(sf);
788 m0->m_ext.ext_size = PAGE_SIZE;
789 m0->m_ext.ext_arg1 = sf;
790 m0->m_ext.ext_type = EXT_SFBUF;
791 m0->m_ext.ext_flags = EXT_FLAG_EMBREF;
792 m0->m_ext.ext_free = sendfile_free_mext;
794 * SF_NOCACHE sets the page as being freed upon send.
795 * However, we ignore it for the last page in 'space',
796 * if the page is truncated, and we got more data to
797 * send (rem > space), or if we have readahead
798 * configured (rhpages > 0).
800 if ((flags & SF_NOCACHE) &&
802 !((off + space) & PAGE_MASK) ||
803 !(rem > space || rhpages > 0)))
804 m0->m_ext.ext_flags |= EXT_FLAG_NOCACHE;
806 m0->m_ext.ext_flags |= EXT_FLAG_SYNC;
807 m0->m_ext.ext_arg2 = sfs;
810 mtx_unlock(&sfs->mtx);
812 m0->m_ext.ext_count = 1;
813 m0->m_flags |= (M_EXT | M_RDONLY);
815 m0->m_flags |= M_NOTREADY;
816 m0->m_data = (char *)sf_buf_kva(sf) +
817 (vmoff(i, off) & PAGE_MASK);
818 m0->m_len = xfsize(i, npages, off, space);
823 /* Append to mbuf chain. */
834 /* Keep track of bytes processed. */
838 /* Prepend header, if any. */
847 KASSERT(softerr, ("%s: m NULL, no error", __func__));
853 /* Add the buffer chain to the socket buffer. */
854 KASSERT(m_length(m, NULL) == space + hdrlen,
855 ("%s: mlen %u space %d hdrlen %d",
856 __func__, m_length(m, NULL), space, hdrlen));
858 CURVNET_SET(so->so_vnet);
861 * If sendfile_swapin() didn't initiate any I/Os,
862 * which happens if all data is cached in VM, then
863 * we can send data right now without the
864 * PRUS_NOTREADY flag.
867 error = (*so->so_proto->pr_usrreqs->pru_send)
868 (so, 0, m, NULL, NULL, td);
870 sfio->npages = npages;
872 error = (*so->so_proto->pr_usrreqs->pru_send)
873 (so, PRUS_NOTREADY, m, NULL, NULL, td);
874 sendfile_iodone(sfio, NULL, 0, 0);
878 m = NULL; /* pru_send always consumes */
881 sbytes += space + hdrlen;
891 * Send trailers. Wimp out and use writev(2).
893 if (trl_uio != NULL) {
894 sbunlock(&so->so_snd);
895 error = kern_writev(td, sockfd, trl_uio);
897 sbytes += td->td_retval[0];
902 sbunlock(&so->so_snd);
905 * If there was no error we have to clear td->td_retval[0]
906 * because it may have been set by writev.
909 td->td_retval[0] = 0;
915 vm_object_deallocate(obj);
926 cv_wait(&sfs->cv, &sfs->mtx);
927 KASSERT(sfs->count == 0, ("sendfile sync still busy"));
928 cv_destroy(&sfs->cv);
929 mtx_destroy(&sfs->mtx);
933 if (error == ERESTART)
940 sendfile(struct thread *td, struct sendfile_args *uap, int compat)
943 struct uio *hdr_uio, *trl_uio;
950 * File offset must be positive. If it goes beyond EOF
951 * we send only the header/trailer and no payload data.
957 hdr_uio = trl_uio = NULL;
959 if (uap->hdtr != NULL) {
960 error = copyin(uap->hdtr, &hdtr, sizeof(hdtr));
963 if (hdtr.headers != NULL) {
964 error = copyinuio(hdtr.headers, hdtr.hdr_cnt,
968 #ifdef COMPAT_FREEBSD4
970 * In FreeBSD < 5.0 the nbytes to send also included
971 * the header. If compat is specified subtract the
972 * header size from nbytes.
975 if (uap->nbytes > hdr_uio->uio_resid)
976 uap->nbytes -= hdr_uio->uio_resid;
982 if (hdtr.trailers != NULL) {
983 error = copyinuio(hdtr.trailers, hdtr.trl_cnt,
990 AUDIT_ARG_FD(uap->fd);
993 * sendfile(2) can start at any offset within a file so we require
994 * CAP_READ+CAP_SEEK = CAP_PREAD.
996 if ((error = fget_read(td, uap->fd,
997 cap_rights_init(&rights, CAP_PREAD), &fp)) != 0) {
1001 error = fo_sendfile(fp, uap->s, hdr_uio, trl_uio, uap->offset,
1002 uap->nbytes, &sbytes, uap->flags, td);
1005 if (uap->sbytes != NULL)
1006 copyout(&sbytes, uap->sbytes, sizeof(off_t));
1009 free(hdr_uio, M_IOV);
1010 free(trl_uio, M_IOV);
1017 * int sendfile(int fd, int s, off_t offset, size_t nbytes,
1018 * struct sf_hdtr *hdtr, off_t *sbytes, int flags)
1020 * Send a file specified by 'fd' and starting at 'offset' to a socket
1021 * specified by 's'. Send only 'nbytes' of the file or until EOF if nbytes ==
1022 * 0. Optionally add a header and/or trailer to the socket output. If
1023 * specified, write the total number of bytes sent into *sbytes.
1026 sys_sendfile(struct thread *td, struct sendfile_args *uap)
1029 return (sendfile(td, uap, 0));
1032 #ifdef COMPAT_FREEBSD4
1034 freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap)
1036 struct sendfile_args args;
1040 args.offset = uap->offset;
1041 args.nbytes = uap->nbytes;
1042 args.hdtr = uap->hdtr;
1043 args.sbytes = uap->sbytes;
1044 args.flags = uap->flags;
1046 return (sendfile(td, &args, 1));
1048 #endif /* COMPAT_FREEBSD4 */