2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
12 * Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
13 * Copyright (c) 2013, 2014 The FreeBSD Foundation
15 * Portions of this software were developed by Konstantin Belousov
16 * under sponsorship from the FreeBSD Foundation.
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 3. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
48 #include "opt_hwpmc_hooks.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
54 #include <sys/fcntl.h>
61 #include <sys/limits.h>
64 #include <sys/mount.h>
65 #include <sys/mutex.h>
66 #include <sys/namei.h>
67 #include <sys/vnode.h>
70 #include <sys/filio.h>
71 #include <sys/resourcevar.h>
72 #include <sys/rwlock.h>
75 #include <sys/sleepqueue.h>
76 #include <sys/sysctl.h>
77 #include <sys/ttycom.h>
79 #include <sys/syslog.h>
80 #include <sys/unistd.h>
82 #include <sys/ktrace.h>
84 #include <security/audit/audit.h>
85 #include <security/mac/mac_framework.h>
88 #include <vm/vm_extern.h>
90 #include <vm/vm_map.h>
91 #include <vm/vm_object.h>
92 #include <vm/vm_page.h>
93 #include <vm/vm_pager.h>
96 #include <sys/pmckern.h>
99 static fo_rdwr_t vn_read;
100 static fo_rdwr_t vn_write;
101 static fo_rdwr_t vn_io_fault;
102 static fo_truncate_t vn_truncate;
103 static fo_ioctl_t vn_ioctl;
104 static fo_poll_t vn_poll;
105 static fo_kqfilter_t vn_kqfilter;
106 static fo_close_t vn_closefile;
107 static fo_mmap_t vn_mmap;
108 static fo_fallocate_t vn_fallocate;
110 struct fileops vnops = {
111 .fo_read = vn_io_fault,
112 .fo_write = vn_io_fault,
113 .fo_truncate = vn_truncate,
114 .fo_ioctl = vn_ioctl,
116 .fo_kqfilter = vn_kqfilter,
117 .fo_stat = vn_statfile,
118 .fo_close = vn_closefile,
119 .fo_chmod = vn_chmod,
120 .fo_chown = vn_chown,
121 .fo_sendfile = vn_sendfile,
123 .fo_fill_kinfo = vn_fill_kinfo,
125 .fo_fallocate = vn_fallocate,
126 .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
129 const u_int io_hold_cnt = 16;
130 static int vn_io_fault_enable = 1;
131 SYSCTL_INT(_debug, OID_AUTO, vn_io_fault_enable, CTLFLAG_RWTUN,
132 &vn_io_fault_enable, 0, "Enable vn_io_fault lock avoidance");
133 static int vn_io_fault_prefault = 0;
134 SYSCTL_INT(_debug, OID_AUTO, vn_io_fault_prefault, CTLFLAG_RWTUN,
135 &vn_io_fault_prefault, 0, "Enable vn_io_fault prefaulting");
136 static int vn_io_pgcache_read_enable = 1;
137 SYSCTL_INT(_debug, OID_AUTO, vn_io_pgcache_read_enable, CTLFLAG_RWTUN,
138 &vn_io_pgcache_read_enable, 0,
139 "Enable copying from page cache for reads, avoiding fs");
140 static u_long vn_io_faults_cnt;
141 SYSCTL_ULONG(_debug, OID_AUTO, vn_io_faults, CTLFLAG_RD,
142 &vn_io_faults_cnt, 0, "Count of vn_io_fault lock avoidance triggers");
144 static int vfs_allow_read_dir = 0;
145 SYSCTL_INT(_security_bsd, OID_AUTO, allow_read_dir, CTLFLAG_RW,
146 &vfs_allow_read_dir, 0,
147 "Enable read(2) of directory by root for filesystems that support it");
150 * Returns true if vn_io_fault mode of handling the i/o request should
154 do_vn_io_fault(struct vnode *vp, struct uio *uio)
158 return (uio->uio_segflg == UIO_USERSPACE && vp->v_type == VREG &&
159 (mp = vp->v_mount) != NULL &&
160 (mp->mnt_kern_flag & MNTK_NO_IOPF) != 0 && vn_io_fault_enable);
164 * Structure used to pass arguments to vn_io_fault1(), to do either
165 * file- or vnode-based I/O calls.
167 struct vn_io_fault_args {
175 struct fop_args_tag {
179 struct vop_args_tag {
185 static int vn_io_fault1(struct vnode *vp, struct uio *uio,
186 struct vn_io_fault_args *args, struct thread *td);
189 vn_open(struct nameidata *ndp, int *flagp, int cmode, struct file *fp)
191 struct thread *td = ndp->ni_cnd.cn_thread;
193 return (vn_open_cred(ndp, flagp, cmode, 0, td->td_ucred, fp));
197 open2nameif(int fmode, u_int vn_open_flags)
201 res = ISOPEN | LOCKLEAF;
202 if ((fmode & O_RESOLVE_BENEATH) != 0)
204 if ((fmode & O_EMPTY_PATH) != 0)
206 if ((vn_open_flags & VN_OPEN_NOAUDIT) == 0)
208 if ((vn_open_flags & VN_OPEN_NOCAPCHECK) != 0)
214 * Common code for vnode open operations via a name lookup.
215 * Lookup the vnode and invoke VOP_CREATE if needed.
216 * Check permissions, and call the VOP_OPEN or VOP_CREATE routine.
218 * Note that this does NOT free nameidata for the successful case,
219 * due to the NDINIT being done elsewhere.
222 vn_open_cred(struct nameidata *ndp, int *flagp, int cmode, u_int vn_open_flags,
223 struct ucred *cred, struct file *fp)
227 struct thread *td = ndp->ni_cnd.cn_thread;
229 struct vattr *vap = &vat;
236 if ((fmode & (O_CREAT | O_EXCL | O_DIRECTORY)) == (O_CREAT |
237 O_EXCL | O_DIRECTORY) ||
238 (fmode & (O_CREAT | O_EMPTY_PATH)) == (O_CREAT | O_EMPTY_PATH))
240 else if ((fmode & (O_CREAT | O_DIRECTORY)) == O_CREAT) {
241 ndp->ni_cnd.cn_nameiop = CREATE;
242 ndp->ni_cnd.cn_flags = open2nameif(fmode, vn_open_flags);
244 * Set NOCACHE to avoid flushing the cache when
245 * rolling in many files at once.
247 * Set NC_KEEPPOSENTRY to keep positive entries if they already
248 * exist despite NOCACHE.
250 ndp->ni_cnd.cn_flags |= LOCKPARENT | NOCACHE | NC_KEEPPOSENTRY;
251 if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
252 ndp->ni_cnd.cn_flags |= FOLLOW;
253 if ((vn_open_flags & VN_OPEN_INVFS) == 0)
255 if ((error = namei(ndp)) != 0)
257 if (ndp->ni_vp == NULL) {
260 vap->va_mode = cmode;
262 vap->va_vaflags |= VA_EXCLUSIVE;
263 if (vn_start_write(ndp->ni_dvp, &mp, V_NOWAIT) != 0) {
264 NDFREE(ndp, NDF_ONLY_PNBUF);
266 if ((error = vn_start_write(NULL, &mp,
267 V_XSLEEP | PCATCH)) != 0)
272 if ((vn_open_flags & VN_OPEN_NAMECACHE) != 0)
273 ndp->ni_cnd.cn_flags |= MAKEENTRY;
275 error = mac_vnode_check_create(cred, ndp->ni_dvp,
279 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
282 if (error == 0 && (fmode & O_EXCL) != 0 &&
283 (fmode & (O_EXLOCK | O_SHLOCK)) != 0) {
285 vp->v_iflag |= VI_FOPENING;
289 VOP_VPUT_PAIR(ndp->ni_dvp, error == 0 ? &vp : NULL,
291 vn_finished_write(mp);
293 NDFREE(ndp, NDF_ONLY_PNBUF);
294 if (error == ERELOOKUP) {
302 if (ndp->ni_dvp == ndp->ni_vp)
308 if (fmode & O_EXCL) {
312 if (vp->v_type == VDIR) {
319 ndp->ni_cnd.cn_nameiop = LOOKUP;
320 ndp->ni_cnd.cn_flags = open2nameif(fmode, vn_open_flags);
321 ndp->ni_cnd.cn_flags |= (fmode & O_NOFOLLOW) != 0 ? NOFOLLOW :
323 if ((fmode & FWRITE) == 0)
324 ndp->ni_cnd.cn_flags |= LOCKSHARED;
325 if ((error = namei(ndp)) != 0)
329 error = vn_open_vnode(vp, fmode, cred, td, fp);
332 vp->v_iflag &= ~VI_FOPENING;
341 NDFREE(ndp, NDF_ONLY_PNBUF);
349 vn_open_vnode_advlock(struct vnode *vp, int fmode, struct file *fp)
352 int error, lock_flags, type;
354 ASSERT_VOP_LOCKED(vp, "vn_open_vnode_advlock");
355 if ((fmode & (O_EXLOCK | O_SHLOCK)) == 0)
357 KASSERT(fp != NULL, ("open with flock requires fp"));
358 if (fp->f_type != DTYPE_NONE && fp->f_type != DTYPE_VNODE)
361 lock_flags = VOP_ISLOCKED(vp);
364 lf.l_whence = SEEK_SET;
367 lf.l_type = (fmode & O_EXLOCK) != 0 ? F_WRLCK : F_RDLCK;
369 if ((fmode & FNONBLOCK) == 0)
371 if ((fmode & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
373 error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
375 fp->f_flag |= FHASLOCK;
377 vn_lock(vp, lock_flags | LK_RETRY);
382 * Common code for vnode open operations once a vnode is located.
383 * Check permissions, and call the VOP_OPEN routine.
386 vn_open_vnode(struct vnode *vp, int fmode, struct ucred *cred,
387 struct thread *td, struct file *fp)
392 if (vp->v_type == VLNK) {
393 if ((fmode & O_PATH) == 0 || (fmode & FEXEC) != 0)
396 if (vp->v_type == VSOCK)
398 if (vp->v_type != VDIR && fmode & O_DIRECTORY)
402 if ((fmode & O_PATH) == 0) {
403 if ((fmode & (FWRITE | O_TRUNC)) != 0) {
404 if (vp->v_type == VDIR)
408 if ((fmode & FREAD) != 0)
410 if ((fmode & O_APPEND) && (fmode & FWRITE))
413 if ((fmode & O_CREAT) != 0)
417 if ((fmode & FEXEC) != 0)
420 if ((fmode & O_VERIFY) != 0)
422 error = mac_vnode_check_open(cred, vp, accmode);
426 accmode &= ~(VCREAT | VVERIFY);
428 if ((fmode & O_CREAT) == 0 && accmode != 0) {
429 error = VOP_ACCESS(vp, accmode, cred, td);
433 if ((fmode & O_PATH) != 0) {
434 if (vp->v_type == VFIFO)
437 error = VOP_ACCESS(vp, VREAD, cred, td);
439 fp->f_flag |= FKQALLOWED;
443 if (vp->v_type == VFIFO && VOP_ISLOCKED(vp) != LK_EXCLUSIVE)
444 vn_lock(vp, LK_UPGRADE | LK_RETRY);
445 error = VOP_OPEN(vp, fmode, cred, td, fp);
449 error = vn_open_vnode_advlock(vp, fmode, fp);
450 if (error == 0 && (fmode & FWRITE) != 0) {
451 error = VOP_ADD_WRITECOUNT(vp, 1);
453 CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d",
454 __func__, vp, vp->v_writecount);
459 * Error from advlock or VOP_ADD_WRITECOUNT() still requires
460 * calling VOP_CLOSE() to pair with earlier VOP_OPEN().
465 * Arrange the call by having fdrop() to use
466 * vn_closefile(). This is to satisfy
467 * filesystems like devfs or tmpfs, which
468 * override fo_close().
470 fp->f_flag |= FOPENFAILED;
472 if (fp->f_ops == &badfileops) {
473 fp->f_type = DTYPE_VNODE;
479 * If there is no fp, due to kernel-mode open,
480 * we can call VOP_CLOSE() now.
482 if (vp->v_type != VFIFO && (fmode & FWRITE) != 0 &&
483 !MNT_EXTENDED_SHARED(vp->v_mount) &&
484 VOP_ISLOCKED(vp) != LK_EXCLUSIVE)
485 vn_lock(vp, LK_UPGRADE | LK_RETRY);
486 (void)VOP_CLOSE(vp, fmode & (FREAD | FWRITE | FEXEC),
491 ASSERT_VOP_LOCKED(vp, "vn_open_vnode");
497 * Check for write permissions on the specified vnode.
498 * Prototype text segments cannot be written.
502 vn_writechk(struct vnode *vp)
505 ASSERT_VOP_LOCKED(vp, "vn_writechk");
507 * If there's shared text associated with
508 * the vnode, try to free it up once. If
509 * we fail, we can't allow writing.
521 vn_close1(struct vnode *vp, int flags, struct ucred *file_cred,
522 struct thread *td, bool keep_ref)
525 int error, lock_flags;
527 if (vp->v_type != VFIFO && (flags & FWRITE) == 0 &&
528 MNT_EXTENDED_SHARED(vp->v_mount))
529 lock_flags = LK_SHARED;
531 lock_flags = LK_EXCLUSIVE;
533 vn_start_write(vp, &mp, V_WAIT);
534 vn_lock(vp, lock_flags | LK_RETRY);
535 AUDIT_ARG_VNODE1(vp);
536 if ((flags & (FWRITE | FOPENFAILED)) == FWRITE) {
537 VOP_ADD_WRITECOUNT_CHECKED(vp, -1);
538 CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d",
539 __func__, vp, vp->v_writecount);
541 error = VOP_CLOSE(vp, flags, file_cred, td);
546 vn_finished_write(mp);
551 vn_close(struct vnode *vp, int flags, struct ucred *file_cred,
555 return (vn_close1(vp, flags, file_cred, td, false));
559 * Heuristic to detect sequential operation.
562 sequential_heuristic(struct uio *uio, struct file *fp)
566 ASSERT_VOP_LOCKED(fp->f_vnode, __func__);
569 if (fp->f_flag & FRDAHEAD)
570 return (fp->f_seqcount[rw] << IO_SEQSHIFT);
573 * Offset 0 is handled specially. open() sets f_seqcount to 1 so
574 * that the first I/O is normally considered to be slightly
575 * sequential. Seeking to offset 0 doesn't change sequentiality
576 * unless previous seeks have reduced f_seqcount to 0, in which
577 * case offset 0 is not special.
579 if ((uio->uio_offset == 0 && fp->f_seqcount[rw] > 0) ||
580 uio->uio_offset == fp->f_nextoff[rw]) {
582 * f_seqcount is in units of fixed-size blocks so that it
583 * depends mainly on the amount of sequential I/O and not
584 * much on the number of sequential I/O's. The fixed size
585 * of 16384 is hard-coded here since it is (not quite) just
586 * a magic size that works well here. This size is more
587 * closely related to the best I/O size for real disks than
588 * to any block size used by software.
590 if (uio->uio_resid >= IO_SEQMAX * 16384)
591 fp->f_seqcount[rw] = IO_SEQMAX;
593 fp->f_seqcount[rw] += howmany(uio->uio_resid, 16384);
594 if (fp->f_seqcount[rw] > IO_SEQMAX)
595 fp->f_seqcount[rw] = IO_SEQMAX;
597 return (fp->f_seqcount[rw] << IO_SEQSHIFT);
600 /* Not sequential. Quickly draw-down sequentiality. */
601 if (fp->f_seqcount[rw] > 1)
602 fp->f_seqcount[rw] = 1;
604 fp->f_seqcount[rw] = 0;
609 * Package up an I/O request on a vnode into a uio and do it.
612 vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset,
613 enum uio_seg segflg, int ioflg, struct ucred *active_cred,
614 struct ucred *file_cred, ssize_t *aresid, struct thread *td)
621 struct vn_io_fault_args args;
622 int error, lock_flags;
624 if (offset < 0 && vp->v_type != VCHR)
626 auio.uio_iov = &aiov;
628 aiov.iov_base = base;
630 auio.uio_resid = len;
631 auio.uio_offset = offset;
632 auio.uio_segflg = segflg;
637 if ((ioflg & IO_NODELOCKED) == 0) {
638 if ((ioflg & IO_RANGELOCKED) == 0) {
639 if (rw == UIO_READ) {
640 rl_cookie = vn_rangelock_rlock(vp, offset,
642 } else if ((ioflg & IO_APPEND) != 0) {
643 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
645 rl_cookie = vn_rangelock_wlock(vp, offset,
651 if (rw == UIO_WRITE) {
652 if (vp->v_type != VCHR &&
653 (error = vn_start_write(vp, &mp, V_WAIT | PCATCH))
656 if (MNT_SHARED_WRITES(mp) ||
657 ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount)))
658 lock_flags = LK_SHARED;
660 lock_flags = LK_EXCLUSIVE;
662 lock_flags = LK_SHARED;
663 vn_lock(vp, lock_flags | LK_RETRY);
667 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
669 if ((ioflg & IO_NOMACCHECK) == 0) {
671 error = mac_vnode_check_read(active_cred, file_cred,
674 error = mac_vnode_check_write(active_cred, file_cred,
679 if (file_cred != NULL)
683 if (do_vn_io_fault(vp, &auio)) {
684 args.kind = VN_IO_FAULT_VOP;
687 args.args.vop_args.vp = vp;
688 error = vn_io_fault1(vp, &auio, &args, td);
689 } else if (rw == UIO_READ) {
690 error = VOP_READ(vp, &auio, ioflg, cred);
691 } else /* if (rw == UIO_WRITE) */ {
692 error = VOP_WRITE(vp, &auio, ioflg, cred);
696 *aresid = auio.uio_resid;
698 if (auio.uio_resid && error == 0)
700 if ((ioflg & IO_NODELOCKED) == 0) {
703 vn_finished_write(mp);
706 if (rl_cookie != NULL)
707 vn_rangelock_unlock(vp, rl_cookie);
712 * Package up an I/O request on a vnode into a uio and do it. The I/O
713 * request is split up into smaller chunks and we try to avoid saturating
714 * the buffer cache while potentially holding a vnode locked, so we
715 * check bwillwrite() before calling vn_rdwr(). We also call kern_yield()
716 * to give other processes a chance to lock the vnode (either other processes
717 * core'ing the same binary, or unrelated processes scanning the directory).
720 vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, void *base, size_t len,
721 off_t offset, enum uio_seg segflg, int ioflg, struct ucred *active_cred,
722 struct ucred *file_cred, size_t *aresid, struct thread *td)
731 * Force `offset' to a multiple of MAXBSIZE except possibly
732 * for the first chunk, so that filesystems only need to
733 * write full blocks except possibly for the first and last
736 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
740 if (rw != UIO_READ && vp->v_type == VREG)
743 error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
744 ioflg, active_cred, file_cred, &iaresid, td);
745 len -= chunk; /* aresid calc already includes length */
749 base = (char *)base + chunk;
750 kern_yield(PRI_USER);
753 *aresid = len + iaresid;
757 #if OFF_MAX <= LONG_MAX
759 foffset_lock(struct file *fp, int flags)
761 volatile short *flagsp;
765 KASSERT((flags & FOF_OFFSET) == 0, ("FOF_OFFSET passed"));
767 if ((flags & FOF_NOLOCK) != 0)
768 return (atomic_load_long(&fp->f_offset));
771 * According to McKusick the vn lock was protecting f_offset here.
772 * It is now protected by the FOFFSET_LOCKED flag.
774 flagsp = &fp->f_vnread_flags;
775 if (atomic_cmpset_acq_16(flagsp, 0, FOFFSET_LOCKED))
776 return (atomic_load_long(&fp->f_offset));
778 sleepq_lock(&fp->f_vnread_flags);
779 state = atomic_load_16(flagsp);
781 if ((state & FOFFSET_LOCKED) == 0) {
782 if (!atomic_fcmpset_acq_16(flagsp, &state,
787 if ((state & FOFFSET_LOCK_WAITING) == 0) {
788 if (!atomic_fcmpset_acq_16(flagsp, &state,
789 state | FOFFSET_LOCK_WAITING))
793 sleepq_add(&fp->f_vnread_flags, NULL, "vofflock", 0, 0);
794 sleepq_wait(&fp->f_vnread_flags, PUSER -1);
796 sleepq_lock(&fp->f_vnread_flags);
797 state = atomic_load_16(flagsp);
799 res = atomic_load_long(&fp->f_offset);
800 sleepq_release(&fp->f_vnread_flags);
805 foffset_unlock(struct file *fp, off_t val, int flags)
807 volatile short *flagsp;
810 KASSERT((flags & FOF_OFFSET) == 0, ("FOF_OFFSET passed"));
812 if ((flags & FOF_NOUPDATE) == 0)
813 atomic_store_long(&fp->f_offset, val);
814 if ((flags & FOF_NEXTOFF_R) != 0)
815 fp->f_nextoff[UIO_READ] = val;
816 if ((flags & FOF_NEXTOFF_W) != 0)
817 fp->f_nextoff[UIO_WRITE] = val;
819 if ((flags & FOF_NOLOCK) != 0)
822 flagsp = &fp->f_vnread_flags;
823 state = atomic_load_16(flagsp);
824 if ((state & FOFFSET_LOCK_WAITING) == 0 &&
825 atomic_cmpset_rel_16(flagsp, state, 0))
828 sleepq_lock(&fp->f_vnread_flags);
829 MPASS((fp->f_vnread_flags & FOFFSET_LOCKED) != 0);
830 MPASS((fp->f_vnread_flags & FOFFSET_LOCK_WAITING) != 0);
831 fp->f_vnread_flags = 0;
832 sleepq_broadcast(&fp->f_vnread_flags, SLEEPQ_SLEEP, 0, 0);
833 sleepq_release(&fp->f_vnread_flags);
837 foffset_lock(struct file *fp, int flags)
842 KASSERT((flags & FOF_OFFSET) == 0, ("FOF_OFFSET passed"));
844 mtxp = mtx_pool_find(mtxpool_sleep, fp);
846 if ((flags & FOF_NOLOCK) == 0) {
847 while (fp->f_vnread_flags & FOFFSET_LOCKED) {
848 fp->f_vnread_flags |= FOFFSET_LOCK_WAITING;
849 msleep(&fp->f_vnread_flags, mtxp, PUSER -1,
852 fp->f_vnread_flags |= FOFFSET_LOCKED;
860 foffset_unlock(struct file *fp, off_t val, int flags)
864 KASSERT((flags & FOF_OFFSET) == 0, ("FOF_OFFSET passed"));
866 mtxp = mtx_pool_find(mtxpool_sleep, fp);
868 if ((flags & FOF_NOUPDATE) == 0)
870 if ((flags & FOF_NEXTOFF_R) != 0)
871 fp->f_nextoff[UIO_READ] = val;
872 if ((flags & FOF_NEXTOFF_W) != 0)
873 fp->f_nextoff[UIO_WRITE] = val;
874 if ((flags & FOF_NOLOCK) == 0) {
875 KASSERT((fp->f_vnread_flags & FOFFSET_LOCKED) != 0,
876 ("Lost FOFFSET_LOCKED"));
877 if (fp->f_vnread_flags & FOFFSET_LOCK_WAITING)
878 wakeup(&fp->f_vnread_flags);
879 fp->f_vnread_flags = 0;
886 foffset_lock_uio(struct file *fp, struct uio *uio, int flags)
889 if ((flags & FOF_OFFSET) == 0)
890 uio->uio_offset = foffset_lock(fp, flags);
894 foffset_unlock_uio(struct file *fp, struct uio *uio, int flags)
897 if ((flags & FOF_OFFSET) == 0)
898 foffset_unlock(fp, uio->uio_offset, flags);
902 get_advice(struct file *fp, struct uio *uio)
907 ret = POSIX_FADV_NORMAL;
908 if (fp->f_advice == NULL || fp->f_vnode->v_type != VREG)
911 mtxp = mtx_pool_find(mtxpool_sleep, fp);
913 if (fp->f_advice != NULL &&
914 uio->uio_offset >= fp->f_advice->fa_start &&
915 uio->uio_offset + uio->uio_resid <= fp->f_advice->fa_end)
916 ret = fp->f_advice->fa_advice;
922 vn_read_from_obj(struct vnode *vp, struct uio *uio)
925 vm_page_t ma[io_hold_cnt + 2];
930 MPASS(uio->uio_resid <= ptoa(io_hold_cnt + 2));
931 obj = atomic_load_ptr(&vp->v_object);
933 return (EJUSTRETURN);
936 * Depends on type stability of vm_objects.
938 vm_object_pip_add(obj, 1);
939 if ((obj->flags & OBJ_DEAD) != 0) {
941 * Note that object might be already reused from the
942 * vnode, and the OBJ_DEAD flag cleared. This is fine,
943 * we recheck for DOOMED vnode state after all pages
944 * are busied, and retract then.
946 * But we check for OBJ_DEAD to ensure that we do not
947 * busy pages while vm_object_terminate_pages()
948 * processes the queue.
954 resid = uio->uio_resid;
955 off = uio->uio_offset;
956 for (i = 0; resid > 0; i++) {
957 MPASS(i < io_hold_cnt + 2);
958 ma[i] = vm_page_grab_unlocked(obj, atop(off),
959 VM_ALLOC_NOCREAT | VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY |
965 * Skip invalid pages. Valid mask can be partial only
966 * at EOF, and we clip later.
968 if (vm_page_none_valid(ma[i])) {
969 vm_page_sunbusy(ma[i]);
982 * Check VIRF_DOOMED after we busied our pages. Since
983 * vgonel() terminates the vnode' vm_object, it cannot
984 * process past pages busied by us.
986 if (VN_IS_DOOMED(vp)) {
991 resid = PAGE_SIZE - (uio->uio_offset & PAGE_MASK) + ptoa(i - 1);
992 if (resid > uio->uio_resid)
993 resid = uio->uio_resid;
996 * Unlocked read of vnp_size is safe because truncation cannot
997 * pass busied page. But we load vnp_size into a local
998 * variable so that possible concurrent extension does not
1001 #if defined(__powerpc__) && !defined(__powerpc64__)
1002 vsz = obj->un_pager.vnp.vnp_size;
1004 vsz = atomic_load_64(&obj->un_pager.vnp.vnp_size);
1006 if (uio->uio_offset >= vsz) {
1007 error = EJUSTRETURN;
1010 if (uio->uio_offset + resid > vsz)
1011 resid = vsz - uio->uio_offset;
1013 error = vn_io_fault_pgmove(ma, uio->uio_offset & PAGE_MASK, resid, uio);
1016 for (j = 0; j < i; j++) {
1018 vm_page_reference(ma[j]);
1019 vm_page_sunbusy(ma[j]);
1022 vm_object_pip_wakeup(obj);
1025 return (uio->uio_resid == 0 ? 0 : EJUSTRETURN);
1029 * File table vnode read routine.
1032 vn_read(struct file *fp, struct uio *uio, struct ucred *active_cred, int flags,
1040 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p",
1042 KASSERT(flags & FOF_OFFSET, ("No FOF_OFFSET"));
1045 if (fp->f_flag & FNONBLOCK)
1046 ioflag |= IO_NDELAY;
1047 if (fp->f_flag & O_DIRECT)
1048 ioflag |= IO_DIRECT;
1051 * Try to read from page cache. VIRF_DOOMED check is racy but
1052 * allows us to avoid unneeded work outright.
1054 if (vn_io_pgcache_read_enable && !mac_vnode_check_read_enabled() &&
1055 (vn_irflag_read(vp) & (VIRF_DOOMED | VIRF_PGREAD)) == VIRF_PGREAD) {
1056 error = VOP_READ_PGCACHE(vp, uio, ioflag, fp->f_cred);
1058 fp->f_nextoff[UIO_READ] = uio->uio_offset;
1061 if (error != EJUSTRETURN)
1065 advice = get_advice(fp, uio);
1066 vn_lock(vp, LK_SHARED | LK_RETRY);
1069 case POSIX_FADV_NORMAL:
1070 case POSIX_FADV_SEQUENTIAL:
1071 case POSIX_FADV_NOREUSE:
1072 ioflag |= sequential_heuristic(uio, fp);
1074 case POSIX_FADV_RANDOM:
1075 /* Disable read-ahead for random I/O. */
1078 orig_offset = uio->uio_offset;
1081 error = mac_vnode_check_read(active_cred, fp->f_cred, vp);
1084 error = VOP_READ(vp, uio, ioflag, fp->f_cred);
1085 fp->f_nextoff[UIO_READ] = uio->uio_offset;
1087 if (error == 0 && advice == POSIX_FADV_NOREUSE &&
1088 orig_offset != uio->uio_offset)
1090 * Use POSIX_FADV_DONTNEED to flush pages and buffers
1091 * for the backing file after a POSIX_FADV_NOREUSE
1094 error = VOP_ADVISE(vp, orig_offset, uio->uio_offset - 1,
1095 POSIX_FADV_DONTNEED);
1100 * File table vnode write routine.
1103 vn_write(struct file *fp, struct uio *uio, struct ucred *active_cred, int flags,
1109 int error, ioflag, lock_flags;
1111 bool need_finished_write;
1113 KASSERT(uio->uio_td == td, ("uio_td %p is not td %p",
1115 KASSERT(flags & FOF_OFFSET, ("No FOF_OFFSET"));
1117 if (vp->v_type == VREG)
1120 if (vp->v_type == VREG && (fp->f_flag & O_APPEND))
1121 ioflag |= IO_APPEND;
1122 if (fp->f_flag & FNONBLOCK)
1123 ioflag |= IO_NDELAY;
1124 if (fp->f_flag & O_DIRECT)
1125 ioflag |= IO_DIRECT;
1127 mp = atomic_load_ptr(&vp->v_mount);
1128 if ((fp->f_flag & O_FSYNC) ||
1129 (mp != NULL && (mp->mnt_flag & MNT_SYNCHRONOUS)))
1133 * For O_DSYNC we set both IO_SYNC and IO_DATASYNC, so that VOP_WRITE()
1134 * implementations that don't understand IO_DATASYNC fall back to full
1137 if (fp->f_flag & O_DSYNC)
1138 ioflag |= IO_SYNC | IO_DATASYNC;
1140 need_finished_write = false;
1141 if (vp->v_type != VCHR) {
1142 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
1145 need_finished_write = true;
1148 advice = get_advice(fp, uio);
1150 if (MNT_SHARED_WRITES(mp) ||
1151 (mp == NULL && MNT_SHARED_WRITES(vp->v_mount))) {
1152 lock_flags = LK_SHARED;
1154 lock_flags = LK_EXCLUSIVE;
1157 vn_lock(vp, lock_flags | LK_RETRY);
1159 case POSIX_FADV_NORMAL:
1160 case POSIX_FADV_SEQUENTIAL:
1161 case POSIX_FADV_NOREUSE:
1162 ioflag |= sequential_heuristic(uio, fp);
1164 case POSIX_FADV_RANDOM:
1165 /* XXX: Is this correct? */
1168 orig_offset = uio->uio_offset;
1171 error = mac_vnode_check_write(active_cred, fp->f_cred, vp);
1174 error = VOP_WRITE(vp, uio, ioflag, fp->f_cred);
1175 fp->f_nextoff[UIO_WRITE] = uio->uio_offset;
1177 if (need_finished_write)
1178 vn_finished_write(mp);
1179 if (error == 0 && advice == POSIX_FADV_NOREUSE &&
1180 orig_offset != uio->uio_offset)
1182 * Use POSIX_FADV_DONTNEED to flush pages and buffers
1183 * for the backing file after a POSIX_FADV_NOREUSE
1186 error = VOP_ADVISE(vp, orig_offset, uio->uio_offset - 1,
1187 POSIX_FADV_DONTNEED);
1193 * The vn_io_fault() is a wrapper around vn_read() and vn_write() to
1194 * prevent the following deadlock:
1196 * Assume that the thread A reads from the vnode vp1 into userspace
1197 * buffer buf1 backed by the pages of vnode vp2. If a page in buf1 is
1198 * currently not resident, then system ends up with the call chain
1199 * vn_read() -> VOP_READ(vp1) -> uiomove() -> [Page Fault] ->
1200 * vm_fault(buf1) -> vnode_pager_getpages(vp2) -> VOP_GETPAGES(vp2)
1201 * which establishes lock order vp1->vn_lock, then vp2->vn_lock.
1202 * If, at the same time, thread B reads from vnode vp2 into buffer buf2
1203 * backed by the pages of vnode vp1, and some page in buf2 is not
1204 * resident, we get a reversed order vp2->vn_lock, then vp1->vn_lock.
1206 * To prevent the lock order reversal and deadlock, vn_io_fault() does
1207 * not allow page faults to happen during VOP_READ() or VOP_WRITE().
1208 * Instead, it first tries to do the whole range i/o with pagefaults
1209 * disabled. If all pages in the i/o buffer are resident and mapped,
1210 * VOP will succeed (ignoring the genuine filesystem errors).
1211 * Otherwise, we get back EFAULT, and vn_io_fault() falls back to do
1212 * i/o in chunks, with all pages in the chunk prefaulted and held
1213 * using vm_fault_quick_hold_pages().
1215 * Filesystems using this deadlock avoidance scheme should use the
1216 * array of the held pages from uio, saved in the curthread->td_ma,
1217 * instead of doing uiomove(). A helper function
1218 * vn_io_fault_uiomove() converts uiomove request into
1219 * uiomove_fromphys() over td_ma array.
1221 * Since vnode locks do not cover the whole i/o anymore, rangelocks
1222 * make the current i/o request atomic with respect to other i/os and
1227 * Decode vn_io_fault_args and perform the corresponding i/o.
1230 vn_io_fault_doio(struct vn_io_fault_args *args, struct uio *uio,
1236 save = vm_fault_disable_pagefaults();
1237 switch (args->kind) {
1238 case VN_IO_FAULT_FOP:
1239 error = (args->args.fop_args.doio)(args->args.fop_args.fp,
1240 uio, args->cred, args->flags, td);
1242 case VN_IO_FAULT_VOP:
1243 if (uio->uio_rw == UIO_READ) {
1244 error = VOP_READ(args->args.vop_args.vp, uio,
1245 args->flags, args->cred);
1246 } else if (uio->uio_rw == UIO_WRITE) {
1247 error = VOP_WRITE(args->args.vop_args.vp, uio,
1248 args->flags, args->cred);
1252 panic("vn_io_fault_doio: unknown kind of io %d %d",
1253 args->kind, uio->uio_rw);
1255 vm_fault_enable_pagefaults(save);
1260 vn_io_fault_touch(char *base, const struct uio *uio)
1265 if (r == -1 || (uio->uio_rw == UIO_READ && subyte(base, r) == -1))
1271 vn_io_fault_prefault_user(const struct uio *uio)
1274 const struct iovec *iov;
1279 KASSERT(uio->uio_segflg == UIO_USERSPACE,
1280 ("vn_io_fault_prefault userspace"));
1284 resid = uio->uio_resid;
1285 base = iov->iov_base;
1288 error = vn_io_fault_touch(base, uio);
1291 if (len < PAGE_SIZE) {
1293 error = vn_io_fault_touch(base + len - 1, uio);
1298 if (++i >= uio->uio_iovcnt)
1300 iov = uio->uio_iov + i;
1301 base = iov->iov_base;
1313 * Common code for vn_io_fault(), agnostic to the kind of i/o request.
1314 * Uses vn_io_fault_doio() to make the call to an actual i/o function.
1315 * Used from vn_rdwr() and vn_io_fault(), which encode the i/o request
1316 * into args and call vn_io_fault1() to handle faults during the user
1317 * mode buffer accesses.
1320 vn_io_fault1(struct vnode *vp, struct uio *uio, struct vn_io_fault_args *args,
1323 vm_page_t ma[io_hold_cnt + 2];
1324 struct uio *uio_clone, short_uio;
1325 struct iovec short_iovec[1];
1326 vm_page_t *prev_td_ma;
1328 vm_offset_t addr, end;
1331 int error, cnt, saveheld, prev_td_ma_cnt;
1333 if (vn_io_fault_prefault) {
1334 error = vn_io_fault_prefault_user(uio);
1336 return (error); /* Or ignore ? */
1339 prot = uio->uio_rw == UIO_READ ? VM_PROT_WRITE : VM_PROT_READ;
1342 * The UFS follows IO_UNIT directive and replays back both
1343 * uio_offset and uio_resid if an error is encountered during the
1344 * operation. But, since the iovec may be already advanced,
1345 * uio is still in an inconsistent state.
1347 * Cache a copy of the original uio, which is advanced to the redo
1348 * point using UIO_NOCOPY below.
1350 uio_clone = cloneuio(uio);
1351 resid = uio->uio_resid;
1353 short_uio.uio_segflg = UIO_USERSPACE;
1354 short_uio.uio_rw = uio->uio_rw;
1355 short_uio.uio_td = uio->uio_td;
1357 error = vn_io_fault_doio(args, uio, td);
1358 if (error != EFAULT)
1361 atomic_add_long(&vn_io_faults_cnt, 1);
1362 uio_clone->uio_segflg = UIO_NOCOPY;
1363 uiomove(NULL, resid - uio->uio_resid, uio_clone);
1364 uio_clone->uio_segflg = uio->uio_segflg;
1366 saveheld = curthread_pflags_set(TDP_UIOHELD);
1367 prev_td_ma = td->td_ma;
1368 prev_td_ma_cnt = td->td_ma_cnt;
1370 while (uio_clone->uio_resid != 0) {
1371 len = uio_clone->uio_iov->iov_len;
1373 KASSERT(uio_clone->uio_iovcnt >= 1,
1374 ("iovcnt underflow"));
1375 uio_clone->uio_iov++;
1376 uio_clone->uio_iovcnt--;
1379 if (len > ptoa(io_hold_cnt))
1380 len = ptoa(io_hold_cnt);
1381 addr = (uintptr_t)uio_clone->uio_iov->iov_base;
1382 end = round_page(addr + len);
1387 cnt = atop(end - trunc_page(addr));
1389 * A perfectly misaligned address and length could cause
1390 * both the start and the end of the chunk to use partial
1391 * page. +2 accounts for such a situation.
1393 cnt = vm_fault_quick_hold_pages(&td->td_proc->p_vmspace->vm_map,
1394 addr, len, prot, ma, io_hold_cnt + 2);
1399 short_uio.uio_iov = &short_iovec[0];
1400 short_iovec[0].iov_base = (void *)addr;
1401 short_uio.uio_iovcnt = 1;
1402 short_uio.uio_resid = short_iovec[0].iov_len = len;
1403 short_uio.uio_offset = uio_clone->uio_offset;
1405 td->td_ma_cnt = cnt;
1407 error = vn_io_fault_doio(args, &short_uio, td);
1408 vm_page_unhold_pages(ma, cnt);
1409 adv = len - short_uio.uio_resid;
1411 uio_clone->uio_iov->iov_base =
1412 (char *)uio_clone->uio_iov->iov_base + adv;
1413 uio_clone->uio_iov->iov_len -= adv;
1414 uio_clone->uio_resid -= adv;
1415 uio_clone->uio_offset += adv;
1417 uio->uio_resid -= adv;
1418 uio->uio_offset += adv;
1420 if (error != 0 || adv == 0)
1423 td->td_ma = prev_td_ma;
1424 td->td_ma_cnt = prev_td_ma_cnt;
1425 curthread_pflags_restore(saveheld);
1427 free(uio_clone, M_IOV);
1432 vn_io_fault(struct file *fp, struct uio *uio, struct ucred *active_cred,
1433 int flags, struct thread *td)
1438 struct vn_io_fault_args args;
1441 doio = uio->uio_rw == UIO_READ ? vn_read : vn_write;
1445 * The ability to read(2) on a directory has historically been
1446 * allowed for all users, but this can and has been the source of
1447 * at least one security issue in the past. As such, it is now hidden
1448 * away behind a sysctl for those that actually need it to use it, and
1449 * restricted to root when it's turned on to make it relatively safe to
1450 * leave on for longer sessions of need.
1452 if (vp->v_type == VDIR) {
1453 KASSERT(uio->uio_rw == UIO_READ,
1454 ("illegal write attempted on a directory"));
1455 if (!vfs_allow_read_dir)
1457 if ((error = priv_check(td, PRIV_VFS_READ_DIR)) != 0)
1461 foffset_lock_uio(fp, uio, flags);
1462 if (do_vn_io_fault(vp, uio)) {
1463 args.kind = VN_IO_FAULT_FOP;
1464 args.args.fop_args.fp = fp;
1465 args.args.fop_args.doio = doio;
1466 args.cred = active_cred;
1467 args.flags = flags | FOF_OFFSET;
1468 if (uio->uio_rw == UIO_READ) {
1469 rl_cookie = vn_rangelock_rlock(vp, uio->uio_offset,
1470 uio->uio_offset + uio->uio_resid);
1471 } else if ((fp->f_flag & O_APPEND) != 0 ||
1472 (flags & FOF_OFFSET) == 0) {
1473 /* For appenders, punt and lock the whole range. */
1474 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
1476 rl_cookie = vn_rangelock_wlock(vp, uio->uio_offset,
1477 uio->uio_offset + uio->uio_resid);
1479 error = vn_io_fault1(vp, uio, &args, td);
1480 vn_rangelock_unlock(vp, rl_cookie);
1482 error = doio(fp, uio, active_cred, flags | FOF_OFFSET, td);
1484 foffset_unlock_uio(fp, uio, flags);
1489 * Helper function to perform the requested uiomove operation using
1490 * the held pages for io->uio_iov[0].iov_base buffer instead of
1491 * copyin/copyout. Access to the pages with uiomove_fromphys()
1492 * instead of iov_base prevents page faults that could occur due to
1493 * pmap_collect() invalidating the mapping created by
1494 * vm_fault_quick_hold_pages(), or pageout daemon, page laundry or
1495 * object cleanup revoking the write access from page mappings.
1497 * Filesystems specified MNTK_NO_IOPF shall use vn_io_fault_uiomove()
1498 * instead of plain uiomove().
1501 vn_io_fault_uiomove(char *data, int xfersize, struct uio *uio)
1503 struct uio transp_uio;
1504 struct iovec transp_iov[1];
1510 if ((td->td_pflags & TDP_UIOHELD) == 0 ||
1511 uio->uio_segflg != UIO_USERSPACE)
1512 return (uiomove(data, xfersize, uio));
1514 KASSERT(uio->uio_iovcnt == 1, ("uio_iovcnt %d", uio->uio_iovcnt));
1515 transp_iov[0].iov_base = data;
1516 transp_uio.uio_iov = &transp_iov[0];
1517 transp_uio.uio_iovcnt = 1;
1518 if (xfersize > uio->uio_resid)
1519 xfersize = uio->uio_resid;
1520 transp_uio.uio_resid = transp_iov[0].iov_len = xfersize;
1521 transp_uio.uio_offset = 0;
1522 transp_uio.uio_segflg = UIO_SYSSPACE;
1524 * Since transp_iov points to data, and td_ma page array
1525 * corresponds to original uio->uio_iov, we need to invert the
1526 * direction of the i/o operation as passed to
1527 * uiomove_fromphys().
1529 switch (uio->uio_rw) {
1531 transp_uio.uio_rw = UIO_READ;
1534 transp_uio.uio_rw = UIO_WRITE;
1537 transp_uio.uio_td = uio->uio_td;
1538 error = uiomove_fromphys(td->td_ma,
1539 ((vm_offset_t)uio->uio_iov->iov_base) & PAGE_MASK,
1540 xfersize, &transp_uio);
1541 adv = xfersize - transp_uio.uio_resid;
1543 (((vm_offset_t)uio->uio_iov->iov_base + adv) >> PAGE_SHIFT) -
1544 (((vm_offset_t)uio->uio_iov->iov_base) >> PAGE_SHIFT);
1546 KASSERT(td->td_ma_cnt >= pgadv, ("consumed pages %d %d", td->td_ma_cnt,
1548 td->td_ma_cnt -= pgadv;
1549 uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + adv;
1550 uio->uio_iov->iov_len -= adv;
1551 uio->uio_resid -= adv;
1552 uio->uio_offset += adv;
1557 vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize,
1561 vm_offset_t iov_base;
1565 if ((td->td_pflags & TDP_UIOHELD) == 0 ||
1566 uio->uio_segflg != UIO_USERSPACE)
1567 return (uiomove_fromphys(ma, offset, xfersize, uio));
1569 KASSERT(uio->uio_iovcnt == 1, ("uio_iovcnt %d", uio->uio_iovcnt));
1570 cnt = xfersize > uio->uio_resid ? uio->uio_resid : xfersize;
1571 iov_base = (vm_offset_t)uio->uio_iov->iov_base;
1572 switch (uio->uio_rw) {
1574 pmap_copy_pages(td->td_ma, iov_base & PAGE_MASK, ma,
1578 pmap_copy_pages(ma, offset, td->td_ma, iov_base & PAGE_MASK,
1582 pgadv = ((iov_base + cnt) >> PAGE_SHIFT) - (iov_base >> PAGE_SHIFT);
1584 KASSERT(td->td_ma_cnt >= pgadv, ("consumed pages %d %d", td->td_ma_cnt,
1586 td->td_ma_cnt -= pgadv;
1587 uio->uio_iov->iov_base = (char *)(iov_base + cnt);
1588 uio->uio_iov->iov_len -= cnt;
1589 uio->uio_resid -= cnt;
1590 uio->uio_offset += cnt;
1595 * File table truncate routine.
1598 vn_truncate(struct file *fp, off_t length, struct ucred *active_cred,
1610 * Lock the whole range for truncation. Otherwise split i/o
1611 * might happen partly before and partly after the truncation.
1613 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
1614 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
1617 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1618 AUDIT_ARG_VNODE1(vp);
1619 if (vp->v_type == VDIR) {
1624 error = mac_vnode_check_write(active_cred, fp->f_cred, vp);
1628 error = vn_truncate_locked(vp, length, (fp->f_flag & O_FSYNC) != 0,
1632 vn_finished_write(mp);
1634 vn_rangelock_unlock(vp, rl_cookie);
1635 if (error == ERELOOKUP)
1641 * Truncate a file that is already locked.
1644 vn_truncate_locked(struct vnode *vp, off_t length, bool sync,
1650 error = VOP_ADD_WRITECOUNT(vp, 1);
1653 vattr.va_size = length;
1655 vattr.va_vaflags |= VA_SYNC;
1656 error = VOP_SETATTR(vp, &vattr, cred);
1657 VOP_ADD_WRITECOUNT_CHECKED(vp, -1);
1663 * File table vnode stat routine.
1666 vn_statfile(struct file *fp, struct stat *sb, struct ucred *active_cred,
1669 struct vnode *vp = fp->f_vnode;
1672 vn_lock(vp, LK_SHARED | LK_RETRY);
1673 error = VOP_STAT(vp, sb, active_cred, fp->f_cred, td);
1680 * File table vnode ioctl routine.
1683 vn_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
1688 struct fiobmap2_arg *bmarg;
1692 switch (vp->v_type) {
1697 vn_lock(vp, LK_SHARED | LK_RETRY);
1698 error = VOP_GETATTR(vp, &vattr, active_cred);
1701 *(int *)data = vattr.va_size - fp->f_offset;
1704 bmarg = (struct fiobmap2_arg *)data;
1705 vn_lock(vp, LK_SHARED | LK_RETRY);
1707 error = mac_vnode_check_read(active_cred, fp->f_cred,
1711 error = VOP_BMAP(vp, bmarg->bn, NULL,
1712 &bmarg->bn, &bmarg->runp, &bmarg->runb);
1719 return (VOP_IOCTL(vp, com, data, fp->f_flag,
1724 return (VOP_IOCTL(vp, com, data, fp->f_flag,
1732 * File table vnode poll routine.
1735 vn_poll(struct file *fp, int events, struct ucred *active_cred,
1742 #if defined(MAC) || defined(AUDIT)
1743 if (AUDITING_TD(td) || mac_vnode_check_poll_enabled()) {
1744 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1745 AUDIT_ARG_VNODE1(vp);
1746 error = mac_vnode_check_poll(active_cred, fp->f_cred, vp);
1752 error = VOP_POLL(vp, events, fp->f_cred, td);
1757 * Acquire the requested lock and then check for validity. LK_RETRY
1758 * permits vn_lock to return doomed vnodes.
1760 static int __noinline
1761 _vn_lock_fallback(struct vnode *vp, int flags, const char *file, int line,
1765 KASSERT((flags & LK_RETRY) == 0 || error == 0,
1766 ("vn_lock: error %d incompatible with flags %#x", error, flags));
1769 VNASSERT(VN_IS_DOOMED(vp), vp, ("vnode not doomed"));
1771 if ((flags & LK_RETRY) == 0) {
1782 * Nothing to do if we got the lock.
1788 * Interlock was dropped by the call in _vn_lock.
1790 flags &= ~LK_INTERLOCK;
1792 error = VOP_LOCK1(vp, flags, file, line);
1793 } while (error != 0);
1798 _vn_lock(struct vnode *vp, int flags, const char *file, int line)
1802 VNASSERT((flags & LK_TYPE_MASK) != 0, vp,
1803 ("vn_lock: no locktype (%d passed)", flags));
1804 VNPASS(vp->v_holdcnt > 0, vp);
1805 error = VOP_LOCK1(vp, flags, file, line);
1806 if (__predict_false(error != 0 || VN_IS_DOOMED(vp)))
1807 return (_vn_lock_fallback(vp, flags, file, line, error));
1812 * File table vnode close routine.
1815 vn_closefile(struct file *fp, struct thread *td)
1823 fp->f_ops = &badfileops;
1824 ref = (fp->f_flag & FHASLOCK) != 0 && fp->f_type == DTYPE_VNODE;
1826 error = vn_close1(vp, fp->f_flag, fp->f_cred, td, ref);
1828 if (__predict_false(ref)) {
1829 lf.l_whence = SEEK_SET;
1832 lf.l_type = F_UNLCK;
1833 (void) VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK);
1840 * Preparing to start a filesystem write operation. If the operation is
1841 * permitted, then we bump the count of operations in progress and
1842 * proceed. If a suspend request is in progress, we wait until the
1843 * suspension is over, and then proceed.
1846 vn_start_write_refed(struct mount *mp, int flags, bool mplocked)
1848 struct mount_pcpu *mpcpu;
1851 if (__predict_true(!mplocked) && (flags & V_XSLEEP) == 0 &&
1852 vfs_op_thread_enter(mp, mpcpu)) {
1853 MPASS((mp->mnt_kern_flag & MNTK_SUSPEND) == 0);
1854 vfs_mp_count_add_pcpu(mpcpu, writeopcount, 1);
1855 vfs_op_thread_exit(mp, mpcpu);
1860 mtx_assert(MNT_MTX(mp), MA_OWNED);
1867 * Check on status of suspension.
1869 if ((curthread->td_pflags & TDP_IGNSUSP) == 0 ||
1870 mp->mnt_susp_owner != curthread) {
1871 mflags = ((mp->mnt_vfc->vfc_flags & VFCF_SBDRY) != 0 ?
1872 (flags & PCATCH) : 0) | (PUSER - 1);
1873 while ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) {
1874 if (flags & V_NOWAIT) {
1875 error = EWOULDBLOCK;
1878 error = msleep(&mp->mnt_flag, MNT_MTX(mp), mflags,
1884 if (flags & V_XSLEEP)
1886 mp->mnt_writeopcount++;
1888 if (error != 0 || (flags & V_XSLEEP) != 0)
1895 vn_start_write(struct vnode *vp, struct mount **mpp, int flags)
1900 KASSERT((flags & V_MNTREF) == 0 || (*mpp != NULL && vp == NULL),
1901 ("V_MNTREF requires mp"));
1905 * If a vnode is provided, get and return the mount point that
1906 * to which it will write.
1909 if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) {
1911 if (error != EOPNOTSUPP)
1916 if ((mp = *mpp) == NULL)
1920 * VOP_GETWRITEMOUNT() returns with the mp refcount held through
1922 * As long as a vnode is not provided we need to acquire a
1923 * refcount for the provided mountpoint too, in order to
1924 * emulate a vfs_ref().
1926 if (vp == NULL && (flags & V_MNTREF) == 0)
1929 return (vn_start_write_refed(mp, flags, false));
1933 * Secondary suspension. Used by operations such as vop_inactive
1934 * routines that are needed by the higher level functions. These
1935 * are allowed to proceed until all the higher level functions have
1936 * completed (indicated by mnt_writeopcount dropping to zero). At that
1937 * time, these operations are halted until the suspension is over.
1940 vn_start_secondary_write(struct vnode *vp, struct mount **mpp, int flags)
1945 KASSERT((flags & V_MNTREF) == 0 || (*mpp != NULL && vp == NULL),
1946 ("V_MNTREF requires mp"));
1950 if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) {
1952 if (error != EOPNOTSUPP)
1958 * If we are not suspended or have not yet reached suspended
1959 * mode, then let the operation proceed.
1961 if ((mp = *mpp) == NULL)
1965 * VOP_GETWRITEMOUNT() returns with the mp refcount held through
1967 * As long as a vnode is not provided we need to acquire a
1968 * refcount for the provided mountpoint too, in order to
1969 * emulate a vfs_ref().
1972 if (vp == NULL && (flags & V_MNTREF) == 0)
1974 if ((mp->mnt_kern_flag & (MNTK_SUSPENDED | MNTK_SUSPEND2)) == 0) {
1975 mp->mnt_secondary_writes++;
1976 mp->mnt_secondary_accwrites++;
1980 if (flags & V_NOWAIT) {
1983 return (EWOULDBLOCK);
1986 * Wait for the suspension to finish.
1988 error = msleep(&mp->mnt_flag, MNT_MTX(mp), (PUSER - 1) | PDROP |
1989 ((mp->mnt_vfc->vfc_flags & VFCF_SBDRY) != 0 ? (flags & PCATCH) : 0),
1998 * Filesystem write operation has completed. If we are suspending and this
1999 * operation is the last one, notify the suspender that the suspension is
2003 vn_finished_write(struct mount *mp)
2005 struct mount_pcpu *mpcpu;
2011 if (vfs_op_thread_enter(mp, mpcpu)) {
2012 vfs_mp_count_sub_pcpu(mpcpu, writeopcount, 1);
2013 vfs_mp_count_sub_pcpu(mpcpu, ref, 1);
2014 vfs_op_thread_exit(mp, mpcpu);
2019 vfs_assert_mount_counters(mp);
2021 c = --mp->mnt_writeopcount;
2022 if (mp->mnt_vfs_ops == 0) {
2023 MPASS((mp->mnt_kern_flag & MNTK_SUSPEND) == 0);
2028 vfs_dump_mount_counters(mp);
2029 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 && c == 0)
2030 wakeup(&mp->mnt_writeopcount);
2035 * Filesystem secondary write operation has completed. If we are
2036 * suspending and this operation is the last one, notify the suspender
2037 * that the suspension is now in effect.
2040 vn_finished_secondary_write(struct mount *mp)
2046 mp->mnt_secondary_writes--;
2047 if (mp->mnt_secondary_writes < 0)
2048 panic("vn_finished_secondary_write: neg cnt");
2049 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 &&
2050 mp->mnt_secondary_writes <= 0)
2051 wakeup(&mp->mnt_secondary_writes);
2056 * Request a filesystem to suspend write operations.
2059 vfs_write_suspend(struct mount *mp, int flags)
2066 vfs_assert_mount_counters(mp);
2067 if (mp->mnt_susp_owner == curthread) {
2068 vfs_op_exit_locked(mp);
2072 while (mp->mnt_kern_flag & MNTK_SUSPEND)
2073 msleep(&mp->mnt_flag, MNT_MTX(mp), PUSER - 1, "wsuspfs", 0);
2076 * Unmount holds a write reference on the mount point. If we
2077 * own busy reference and drain for writers, we deadlock with
2078 * the reference draining in the unmount path. Callers of
2079 * vfs_write_suspend() must specify VS_SKIP_UNMOUNT if
2080 * vfs_busy() reference is owned and caller is not in the
2083 if ((flags & VS_SKIP_UNMOUNT) != 0 &&
2084 (mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
2085 vfs_op_exit_locked(mp);
2090 mp->mnt_kern_flag |= MNTK_SUSPEND;
2091 mp->mnt_susp_owner = curthread;
2092 if (mp->mnt_writeopcount > 0)
2093 (void) msleep(&mp->mnt_writeopcount,
2094 MNT_MTX(mp), (PUSER - 1)|PDROP, "suspwt", 0);
2097 if ((error = VFS_SYNC(mp, MNT_SUSPEND)) != 0) {
2098 vfs_write_resume(mp, 0);
2099 /* vfs_write_resume does vfs_op_exit() for us */
2105 * Request a filesystem to resume write operations.
2108 vfs_write_resume(struct mount *mp, int flags)
2112 if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) {
2113 KASSERT(mp->mnt_susp_owner == curthread, ("mnt_susp_owner"));
2114 mp->mnt_kern_flag &= ~(MNTK_SUSPEND | MNTK_SUSPEND2 |
2116 mp->mnt_susp_owner = NULL;
2117 wakeup(&mp->mnt_writeopcount);
2118 wakeup(&mp->mnt_flag);
2119 curthread->td_pflags &= ~TDP_IGNSUSP;
2120 if ((flags & VR_START_WRITE) != 0) {
2122 mp->mnt_writeopcount++;
2125 if ((flags & VR_NO_SUSPCLR) == 0)
2128 } else if ((flags & VR_START_WRITE) != 0) {
2130 vn_start_write_refed(mp, 0, true);
2137 * Helper loop around vfs_write_suspend() for filesystem unmount VFS
2141 vfs_write_suspend_umnt(struct mount *mp)
2145 KASSERT((curthread->td_pflags & TDP_IGNSUSP) == 0,
2146 ("vfs_write_suspend_umnt: recursed"));
2148 /* dounmount() already called vn_start_write(). */
2150 vn_finished_write(mp);
2151 error = vfs_write_suspend(mp, 0);
2153 vn_start_write(NULL, &mp, V_WAIT);
2157 if ((mp->mnt_kern_flag & MNTK_SUSPENDED) != 0)
2160 vn_start_write(NULL, &mp, V_WAIT);
2162 mp->mnt_kern_flag &= ~(MNTK_SUSPENDED | MNTK_SUSPEND2);
2163 wakeup(&mp->mnt_flag);
2165 curthread->td_pflags |= TDP_IGNSUSP;
2170 * Implement kqueues for files by translating it to vnode operation.
2173 vn_kqfilter(struct file *fp, struct knote *kn)
2176 return (VOP_KQFILTER(fp->f_vnode, kn));
2180 vn_kqfilter_opath(struct file *fp, struct knote *kn)
2182 if ((fp->f_flag & FKQALLOWED) == 0)
2184 return (vn_kqfilter(fp, kn));
2188 * Simplified in-kernel wrapper calls for extended attribute access.
2189 * Both calls pass in a NULL credential, authorizing as "kernel" access.
2190 * Set IO_NODELOCKED in ioflg if the vnode is already locked.
2193 vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace,
2194 const char *attrname, int *buflen, char *buf, struct thread *td)
2200 iov.iov_len = *buflen;
2203 auio.uio_iov = &iov;
2204 auio.uio_iovcnt = 1;
2205 auio.uio_rw = UIO_READ;
2206 auio.uio_segflg = UIO_SYSSPACE;
2208 auio.uio_offset = 0;
2209 auio.uio_resid = *buflen;
2211 if ((ioflg & IO_NODELOCKED) == 0)
2212 vn_lock(vp, LK_SHARED | LK_RETRY);
2214 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
2216 /* authorize attribute retrieval as kernel */
2217 error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL,
2220 if ((ioflg & IO_NODELOCKED) == 0)
2224 *buflen = *buflen - auio.uio_resid;
2231 * XXX failure mode if partially written?
2234 vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
2235 const char *attrname, int buflen, char *buf, struct thread *td)
2242 iov.iov_len = buflen;
2245 auio.uio_iov = &iov;
2246 auio.uio_iovcnt = 1;
2247 auio.uio_rw = UIO_WRITE;
2248 auio.uio_segflg = UIO_SYSSPACE;
2250 auio.uio_offset = 0;
2251 auio.uio_resid = buflen;
2253 if ((ioflg & IO_NODELOCKED) == 0) {
2254 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0)
2256 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2259 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
2261 /* authorize attribute setting as kernel */
2262 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, td);
2264 if ((ioflg & IO_NODELOCKED) == 0) {
2265 vn_finished_write(mp);
2273 vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
2274 const char *attrname, struct thread *td)
2279 if ((ioflg & IO_NODELOCKED) == 0) {
2280 if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0)
2282 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
2285 ASSERT_VOP_LOCKED(vp, "IO_NODELOCKED with no vp lock held");
2287 /* authorize attribute removal as kernel */
2288 error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, td);
2289 if (error == EOPNOTSUPP)
2290 error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL,
2293 if ((ioflg & IO_NODELOCKED) == 0) {
2294 vn_finished_write(mp);
2302 vn_get_ino_alloc_vget(struct mount *mp, void *arg, int lkflags,
2306 return (VFS_VGET(mp, *(ino_t *)arg, lkflags, rvp));
2310 vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags, struct vnode **rvp)
2313 return (vn_vget_ino_gen(vp, vn_get_ino_alloc_vget, &ino,
2318 vn_vget_ino_gen(struct vnode *vp, vn_get_ino_t alloc, void *alloc_arg,
2319 int lkflags, struct vnode **rvp)
2324 ASSERT_VOP_LOCKED(vp, "vn_vget_ino_get");
2326 ltype = VOP_ISLOCKED(vp);
2327 KASSERT(ltype == LK_EXCLUSIVE || ltype == LK_SHARED,
2328 ("vn_vget_ino: vp not locked"));
2329 error = vfs_busy(mp, MBF_NOWAIT);
2333 error = vfs_busy(mp, 0);
2334 vn_lock(vp, ltype | LK_RETRY);
2338 if (VN_IS_DOOMED(vp)) {
2344 error = alloc(mp, alloc_arg, lkflags, rvp);
2346 if (error != 0 || *rvp != vp)
2347 vn_lock(vp, ltype | LK_RETRY);
2348 if (VN_IS_DOOMED(vp)) {
2361 vn_rlimit_fsize(const struct vnode *vp, const struct uio *uio,
2371 * There are conditions where the limit is to be ignored.
2372 * However, since it is almost never reached, check it first.
2374 ktr_write = (td->td_pflags & TDP_INKTRACE) != 0;
2375 lim = lim_cur(td, RLIMIT_FSIZE);
2376 if (__predict_false(ktr_write))
2377 lim = td->td_ktr_io_lim;
2378 if (__predict_true((uoff_t)uio->uio_offset + uio->uio_resid <= lim))
2382 * The limit is reached.
2384 if (vp->v_type != VREG ||
2385 (td->td_pflags2 & TDP2_ACCT) != 0)
2388 if (!ktr_write || ktr_filesize_limit_signal) {
2389 PROC_LOCK(td->td_proc);
2390 kern_psignal(td->td_proc, SIGXFSZ);
2391 PROC_UNLOCK(td->td_proc);
2397 vn_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
2404 vn_lock(vp, LK_SHARED | LK_RETRY);
2405 AUDIT_ARG_VNODE1(vp);
2408 return (setfmode(td, active_cred, vp, mode));
2412 vn_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
2419 vn_lock(vp, LK_SHARED | LK_RETRY);
2420 AUDIT_ARG_VNODE1(vp);
2423 return (setfown(td, active_cred, vp, uid, gid));
2427 vn_pages_remove(struct vnode *vp, vm_pindex_t start, vm_pindex_t end)
2431 if ((object = vp->v_object) == NULL)
2433 VM_OBJECT_WLOCK(object);
2434 vm_object_page_remove(object, start, end, 0);
2435 VM_OBJECT_WUNLOCK(object);
2439 vn_bmap_seekhole(struct vnode *vp, u_long cmd, off_t *off, struct ucred *cred)
2447 KASSERT(cmd == FIOSEEKHOLE || cmd == FIOSEEKDATA,
2448 ("Wrong command %lu", cmd));
2450 if (vn_lock(vp, LK_SHARED) != 0)
2452 if (vp->v_type != VREG) {
2456 error = VOP_GETATTR(vp, &va, cred);
2460 if (noff >= va.va_size) {
2464 bsize = vp->v_mount->mnt_stat.f_iosize;
2465 for (bn = noff / bsize; noff < va.va_size; bn++, noff += bsize -
2467 error = VOP_BMAP(vp, bn, NULL, &bnp, NULL, NULL);
2468 if (error == EOPNOTSUPP) {
2472 if ((bnp == -1 && cmd == FIOSEEKHOLE) ||
2473 (bnp != -1 && cmd == FIOSEEKDATA)) {
2480 if (noff > va.va_size)
2482 /* noff == va.va_size. There is an implicit hole at the end of file. */
2483 if (cmd == FIOSEEKDATA)
2493 vn_seek(struct file *fp, off_t offset, int whence, struct thread *td)
2498 off_t foffset, size;
2501 cred = td->td_ucred;
2503 foffset = foffset_lock(fp, 0);
2504 noneg = (vp->v_type != VCHR);
2510 (offset > 0 && foffset > OFF_MAX - offset))) {
2517 vn_lock(vp, LK_SHARED | LK_RETRY);
2518 error = VOP_GETATTR(vp, &vattr, cred);
2524 * If the file references a disk device, then fetch
2525 * the media size and use that to determine the ending
2528 if (vattr.va_size == 0 && vp->v_type == VCHR &&
2529 fo_ioctl(fp, DIOCGMEDIASIZE, &size, cred, td) == 0)
2530 vattr.va_size = size;
2532 (vattr.va_size > OFF_MAX ||
2533 (offset > 0 && vattr.va_size > OFF_MAX - offset))) {
2537 offset += vattr.va_size;
2542 error = fo_ioctl(fp, FIOSEEKDATA, &offset, cred, td);
2543 if (error == ENOTTY)
2547 error = fo_ioctl(fp, FIOSEEKHOLE, &offset, cred, td);
2548 if (error == ENOTTY)
2554 if (error == 0 && noneg && offset < 0)
2558 VFS_KNOTE_UNLOCKED(vp, 0);
2559 td->td_uretoff.tdu_off = offset;
2561 foffset_unlock(fp, offset, error != 0 ? FOF_NOUPDATE : 0);
2566 vn_utimes_perm(struct vnode *vp, struct vattr *vap, struct ucred *cred,
2572 * Grant permission if the caller is the owner of the file, or
2573 * the super-user, or has ACL_WRITE_ATTRIBUTES permission on
2574 * on the file. If the time pointer is null, then write
2575 * permission on the file is also sufficient.
2577 * From NFSv4.1, draft 21, 6.2.1.3.1, Discussion of Mask Attributes:
2578 * A user having ACL_WRITE_DATA or ACL_WRITE_ATTRIBUTES
2579 * will be allowed to set the times [..] to the current
2582 error = VOP_ACCESSX(vp, VWRITE_ATTRIBUTES, cred, td);
2583 if (error != 0 && (vap->va_vaflags & VA_UTIMES_NULL) != 0)
2584 error = VOP_ACCESS(vp, VWRITE, cred, td);
2589 vn_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
2594 if (fp->f_type == DTYPE_FIFO)
2595 kif->kf_type = KF_TYPE_FIFO;
2597 kif->kf_type = KF_TYPE_VNODE;
2600 FILEDESC_SUNLOCK(fdp);
2601 error = vn_fill_kinfo_vnode(vp, kif);
2603 FILEDESC_SLOCK(fdp);
2608 vn_fill_junk(struct kinfo_file *kif)
2613 * Simulate vn_fullpath returning changing values for a given
2614 * vp during e.g. coredump.
2616 len = (arc4random() % (sizeof(kif->kf_path) - 2)) + 1;
2617 olen = strlen(kif->kf_path);
2619 strcpy(&kif->kf_path[len - 1], "$");
2621 for (; olen < len; olen++)
2622 strcpy(&kif->kf_path[olen], "A");
2626 vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif)
2629 char *fullpath, *freepath;
2632 kif->kf_un.kf_file.kf_file_type = vntype_to_kinfo(vp->v_type);
2635 error = vn_fullpath(vp, &fullpath, &freepath);
2637 strlcpy(kif->kf_path, fullpath, sizeof(kif->kf_path));
2639 if (freepath != NULL)
2640 free(freepath, M_TEMP);
2642 KFAIL_POINT_CODE(DEBUG_FP, fill_kinfo_vnode__random_path,
2647 * Retrieve vnode attributes.
2649 va.va_fsid = VNOVAL;
2651 vn_lock(vp, LK_SHARED | LK_RETRY);
2652 error = VOP_GETATTR(vp, &va, curthread->td_ucred);
2656 if (va.va_fsid != VNOVAL)
2657 kif->kf_un.kf_file.kf_file_fsid = va.va_fsid;
2659 kif->kf_un.kf_file.kf_file_fsid =
2660 vp->v_mount->mnt_stat.f_fsid.val[0];
2661 kif->kf_un.kf_file.kf_file_fsid_freebsd11 =
2662 kif->kf_un.kf_file.kf_file_fsid; /* truncate */
2663 kif->kf_un.kf_file.kf_file_fileid = va.va_fileid;
2664 kif->kf_un.kf_file.kf_file_mode = MAKEIMODE(va.va_type, va.va_mode);
2665 kif->kf_un.kf_file.kf_file_size = va.va_size;
2666 kif->kf_un.kf_file.kf_file_rdev = va.va_rdev;
2667 kif->kf_un.kf_file.kf_file_rdev_freebsd11 =
2668 kif->kf_un.kf_file.kf_file_rdev; /* truncate */
2673 vn_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
2674 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
2678 struct pmckern_map_in pkm;
2684 boolean_t writecounted;
2687 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
2688 defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
2690 * POSIX shared-memory objects are defined to have
2691 * kernel persistence, and are not defined to support
2692 * read(2)/write(2) -- or even open(2). Thus, we can
2693 * use MAP_ASYNC to trade on-disk coherence for speed.
2694 * The shm_open(3) library routine turns on the FPOSIXSHM
2695 * flag to request this behavior.
2697 if ((fp->f_flag & FPOSIXSHM) != 0)
2698 flags |= MAP_NOSYNC;
2703 * Ensure that file and memory protections are
2704 * compatible. Note that we only worry about
2705 * writability if mapping is shared; in this case,
2706 * current and max prot are dictated by the open file.
2707 * XXX use the vnode instead? Problem is: what
2708 * credentials do we use for determination? What if
2709 * proc does a setuid?
2712 if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) {
2713 maxprot = VM_PROT_NONE;
2714 if ((prot & VM_PROT_EXECUTE) != 0)
2717 maxprot = VM_PROT_EXECUTE;
2718 if ((fp->f_flag & FREAD) != 0)
2719 maxprot |= VM_PROT_READ;
2720 else if ((prot & VM_PROT_READ) != 0)
2724 * If we are sharing potential changes via MAP_SHARED and we
2725 * are trying to get write permission although we opened it
2726 * without asking for it, bail out.
2728 if ((flags & MAP_SHARED) != 0) {
2729 if ((fp->f_flag & FWRITE) != 0)
2730 maxprot |= VM_PROT_WRITE;
2731 else if ((prot & VM_PROT_WRITE) != 0)
2734 maxprot |= VM_PROT_WRITE;
2735 cap_maxprot |= VM_PROT_WRITE;
2737 maxprot &= cap_maxprot;
2740 * For regular files and shared memory, POSIX requires that
2741 * the value of foff be a legitimate offset within the data
2742 * object. In particular, negative offsets are invalid.
2743 * Blocking negative offsets and overflows here avoids
2744 * possible wraparound or user-level access into reserved
2745 * ranges of the data object later. In contrast, POSIX does
2746 * not dictate how offsets are used by device drivers, so in
2747 * the case of a device mapping a negative offset is passed
2754 foff > OFF_MAX - size)
2757 writecounted = FALSE;
2758 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags, vp,
2759 &foff, &object, &writecounted);
2762 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
2763 foff, writecounted, td);
2766 * If this mapping was accounted for in the vnode's
2767 * writecount, then undo that now.
2770 vm_pager_release_writecount(object, 0, size);
2771 vm_object_deallocate(object);
2774 /* Inform hwpmc(4) if an executable is being mapped. */
2775 if (PMC_HOOK_INSTALLED(PMC_FN_MMAP)) {
2776 if ((prot & VM_PROT_EXECUTE) != 0 && error == 0) {
2778 pkm.pm_address = (uintptr_t) *addr;
2779 PMC_CALL_HOOK_UNLOCKED(td, PMC_FN_MMAP, (void *) &pkm);
2787 vn_fsid(struct vnode *vp, struct vattr *va)
2791 f = &vp->v_mount->mnt_stat.f_fsid;
2792 va->va_fsid = (uint32_t)f->val[1];
2793 va->va_fsid <<= sizeof(f->val[1]) * NBBY;
2794 va->va_fsid += (uint32_t)f->val[0];
2798 vn_fsync_buf(struct vnode *vp, int waitfor)
2800 struct buf *bp, *nbp;
2803 int error, maxretry;
2806 maxretry = 10000; /* large, arbitrarily chosen */
2808 if (vp->v_type == VCHR) {
2810 mp = vp->v_rdev->si_mountpt;
2817 * MARK/SCAN initialization to avoid infinite loops.
2819 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
2820 bp->b_vflags &= ~BV_SCANNED;
2825 * Flush all dirty buffers associated with a vnode.
2828 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
2829 if ((bp->b_vflags & BV_SCANNED) != 0)
2831 bp->b_vflags |= BV_SCANNED;
2832 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
2833 if (waitfor != MNT_WAIT)
2836 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL,
2837 BO_LOCKPTR(bo)) != 0) {
2844 KASSERT(bp->b_bufobj == bo,
2845 ("bp %p wrong b_bufobj %p should be %p",
2846 bp, bp->b_bufobj, bo));
2847 if ((bp->b_flags & B_DELWRI) == 0)
2848 panic("fsync: not dirty");
2849 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
2855 if (maxretry < 1000)
2856 pause("dirty", hz < 1000 ? 1 : hz / 1000);
2862 * If synchronous the caller expects us to completely resolve all
2863 * dirty buffers in the system. Wait for in-progress I/O to
2864 * complete (which could include background bitmap writes), then
2865 * retry if dirty blocks still exist.
2867 if (waitfor == MNT_WAIT) {
2868 bufobj_wwait(bo, 0, 0);
2869 if (bo->bo_dirty.bv_cnt > 0) {
2871 * If we are unable to write any of these buffers
2872 * then we fail now rather than trying endlessly
2873 * to write them out.
2875 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
2876 if ((error = bp->b_error) != 0)
2878 if ((mp != NULL && mp->mnt_secondary_writes > 0) ||
2879 (error == 0 && --maxretry >= 0))
2887 vn_printf(vp, "fsync: giving up on dirty (error = %d) ", error);
2893 * Copies a byte range from invp to outvp. Calls VOP_COPY_FILE_RANGE()
2894 * or vn_generic_copy_file_range() after rangelocking the byte ranges,
2895 * to do the actual copy.
2896 * vn_generic_copy_file_range() is factored out, so it can be called
2897 * from a VOP_COPY_FILE_RANGE() call as well, but handles vnodes from
2898 * different file systems.
2901 vn_copy_file_range(struct vnode *invp, off_t *inoffp, struct vnode *outvp,
2902 off_t *outoffp, size_t *lenp, unsigned int flags, struct ucred *incred,
2903 struct ucred *outcred, struct thread *fsize_td)
2910 *lenp = 0; /* For error returns. */
2913 /* Do some sanity checks on the arguments. */
2914 if (invp->v_type == VDIR || outvp->v_type == VDIR)
2916 else if (*inoffp < 0 || *outoffp < 0 ||
2917 invp->v_type != VREG || outvp->v_type != VREG)
2922 /* Ensure offset + len does not wrap around. */
2925 if (uval > INT64_MAX)
2926 len = INT64_MAX - *inoffp;
2929 if (uval > INT64_MAX)
2930 len = INT64_MAX - *outoffp;
2935 * If the two vnode are for the same file system, call
2936 * VOP_COPY_FILE_RANGE(), otherwise call vn_generic_copy_file_range()
2937 * which can handle copies across multiple file systems.
2940 if (invp->v_mount == outvp->v_mount)
2941 error = VOP_COPY_FILE_RANGE(invp, inoffp, outvp, outoffp,
2942 lenp, flags, incred, outcred, fsize_td);
2944 error = vn_generic_copy_file_range(invp, inoffp, outvp,
2945 outoffp, lenp, flags, incred, outcred, fsize_td);
2951 * Test len bytes of data starting at dat for all bytes == 0.
2952 * Return true if all bytes are zero, false otherwise.
2953 * Expects dat to be well aligned.
2956 mem_iszero(void *dat, int len)
2962 for (p = dat; len > 0; len -= sizeof(*p), p++) {
2963 if (len >= sizeof(*p)) {
2967 cp = (const char *)p;
2968 for (i = 0; i < len; i++, cp++)
2977 * Look for a hole in the output file and, if found, adjust *outoffp
2978 * and *xferp to skip past the hole.
2979 * *xferp is the entire hole length to be written and xfer2 is how many bytes
2980 * to be written as 0's upon return.
2983 vn_skip_hole(struct vnode *outvp, off_t xfer2, off_t *outoffp, off_t *xferp,
2984 off_t *dataoffp, off_t *holeoffp, struct ucred *cred)
2989 if (*holeoffp == 0 || *holeoffp <= *outoffp) {
2990 *dataoffp = *outoffp;
2991 error = VOP_IOCTL(outvp, FIOSEEKDATA, dataoffp, 0, cred,
2994 *holeoffp = *dataoffp;
2995 error = VOP_IOCTL(outvp, FIOSEEKHOLE, holeoffp, 0, cred,
2998 if (error != 0 || *holeoffp == *dataoffp) {
3000 * Since outvp is unlocked, it may be possible for
3001 * another thread to do a truncate(), lseek(), write()
3002 * creating a hole at startoff between the above
3003 * VOP_IOCTL() calls, if the other thread does not do
3005 * If that happens, *holeoffp == *dataoffp and finding
3006 * the hole has failed, so disable vn_skip_hole().
3008 *holeoffp = -1; /* Disable use of vn_skip_hole(). */
3011 KASSERT(*dataoffp >= *outoffp,
3012 ("vn_skip_hole: dataoff=%jd < outoff=%jd",
3013 (intmax_t)*dataoffp, (intmax_t)*outoffp));
3014 KASSERT(*holeoffp > *dataoffp,
3015 ("vn_skip_hole: holeoff=%jd <= dataoff=%jd",
3016 (intmax_t)*holeoffp, (intmax_t)*dataoffp));
3020 * If there is a hole before the data starts, advance *outoffp and
3021 * *xferp past the hole.
3023 if (*dataoffp > *outoffp) {
3024 delta = *dataoffp - *outoffp;
3025 if (delta >= *xferp) {
3026 /* Entire *xferp is a hole. */
3033 xfer2 = MIN(xfer2, *xferp);
3037 * If a hole starts before the end of this xfer2, reduce this xfer2 so
3038 * that the write ends at the start of the hole.
3039 * *holeoffp should always be greater than *outoffp, but for the
3040 * non-INVARIANTS case, check this to make sure xfer2 remains a sane
3043 if (*holeoffp > *outoffp && *holeoffp < *outoffp + xfer2)
3044 xfer2 = *holeoffp - *outoffp;
3049 * Write an xfer sized chunk to outvp in blksize blocks from dat.
3050 * dat is a maximum of blksize in length and can be written repeatedly in
3052 * If growfile == true, just grow the file via vn_truncate_locked() instead
3053 * of doing actual writes.
3054 * If checkhole == true, a hole is being punched, so skip over any hole
3055 * already in the output file.
3058 vn_write_outvp(struct vnode *outvp, char *dat, off_t outoff, off_t xfer,
3059 u_long blksize, bool growfile, bool checkhole, struct ucred *cred)
3062 off_t dataoff, holeoff, xfer2;
3066 * Loop around doing writes of blksize until write has been completed.
3067 * Lock/unlock on each loop iteration so that a bwillwrite() can be
3068 * done for each iteration, since the xfer argument can be very
3069 * large if there is a large hole to punch in the output file.
3074 xfer2 = MIN(xfer, blksize);
3077 * Punching a hole. Skip writing if there is
3078 * already a hole in the output file.
3080 xfer2 = vn_skip_hole(outvp, xfer2, &outoff, &xfer,
3081 &dataoff, &holeoff, cred);
3086 KASSERT(xfer2 > 0, ("vn_write_outvp: xfer2=%jd",
3091 error = vn_start_write(outvp, &mp, V_WAIT);
3095 error = vn_lock(outvp, LK_EXCLUSIVE);
3097 error = vn_truncate_locked(outvp, outoff + xfer,
3102 if (MNT_SHARED_WRITES(mp))
3105 lckf = LK_EXCLUSIVE;
3106 error = vn_lock(outvp, lckf);
3108 error = vn_rdwr(UIO_WRITE, outvp, dat, xfer2,
3109 outoff, UIO_SYSSPACE, IO_NODELOCKED,
3110 curthread->td_ucred, cred, NULL, curthread);
3117 vn_finished_write(mp);
3118 } while (!growfile && xfer > 0 && error == 0);
3123 * Copy a byte range of one file to another. This function can handle the
3124 * case where invp and outvp are on different file systems.
3125 * It can also be called by a VOP_COPY_FILE_RANGE() to do the work, if there
3126 * is no better file system specific way to do it.
3129 vn_generic_copy_file_range(struct vnode *invp, off_t *inoffp,
3130 struct vnode *outvp, off_t *outoffp, size_t *lenp, unsigned int flags,
3131 struct ucred *incred, struct ucred *outcred, struct thread *fsize_td)
3133 struct vattr va, inva;
3136 off_t startoff, endoff, xfer, xfer2;
3138 int error, interrupted;
3139 bool cantseek, readzeros, eof, lastblock, holetoeof;
3141 size_t copylen, len, rem, savlen;
3143 long holein, holeout;
3145 holein = holeout = 0;
3146 savlen = len = *lenp;
3151 error = vn_lock(invp, LK_SHARED);
3154 if (VOP_PATHCONF(invp, _PC_MIN_HOLE_SIZE, &holein) != 0)
3157 error = VOP_GETATTR(invp, &inva, incred);
3163 error = vn_start_write(outvp, &mp, V_WAIT);
3165 error = vn_lock(outvp, LK_EXCLUSIVE);
3168 * If fsize_td != NULL, do a vn_rlimit_fsize() call,
3169 * now that outvp is locked.
3171 if (fsize_td != NULL) {
3172 io.uio_offset = *outoffp;
3174 error = vn_rlimit_fsize(outvp, &io, fsize_td);
3178 if (VOP_PATHCONF(outvp, _PC_MIN_HOLE_SIZE, &holeout) != 0)
3181 * Holes that are past EOF do not need to be written as a block
3182 * of zero bytes. So, truncate the output file as far as
3183 * possible and then use va.va_size to decide if writing 0
3184 * bytes is necessary in the loop below.
3187 error = VOP_GETATTR(outvp, &va, outcred);
3188 if (error == 0 && va.va_size > *outoffp && va.va_size <=
3191 error = mac_vnode_check_write(curthread->td_ucred,
3195 error = vn_truncate_locked(outvp, *outoffp,
3198 va.va_size = *outoffp;
3203 vn_finished_write(mp);
3208 * Set the blksize to the larger of the hole sizes for invp and outvp.
3209 * If hole sizes aren't available, set the blksize to the larger
3210 * f_iosize of invp and outvp.
3211 * This code expects the hole sizes and f_iosizes to be powers of 2.
3212 * This value is clipped at 4Kbytes and 1Mbyte.
3214 blksize = MAX(holein, holeout);
3216 /* Clip len to end at an exact multiple of hole size. */
3218 rem = *inoffp % blksize;
3220 rem = blksize - rem;
3221 if (len > rem && len - rem > blksize)
3222 len = savlen = rounddown(len - rem, blksize) + rem;
3226 blksize = MAX(invp->v_mount->mnt_stat.f_iosize,
3227 outvp->v_mount->mnt_stat.f_iosize);
3230 else if (blksize > 1024 * 1024)
3231 blksize = 1024 * 1024;
3232 dat = malloc(blksize, M_TEMP, M_WAITOK);
3235 * If VOP_IOCTL(FIOSEEKHOLE) works for invp, use it and FIOSEEKDATA
3236 * to find holes. Otherwise, just scan the read block for all 0s
3237 * in the inner loop where the data copying is done.
3238 * Note that some file systems such as NFSv3, NFSv4.0 and NFSv4.1 may
3239 * support holes on the server, but do not support FIOSEEKHOLE.
3241 holetoeof = eof = false;
3242 while (len > 0 && error == 0 && !eof && interrupted == 0) {
3243 endoff = 0; /* To shut up compilers. */
3249 * Find the next data area. If there is just a hole to EOF,
3250 * FIOSEEKDATA should fail with ENXIO.
3251 * (I do not know if any file system will report a hole to
3252 * EOF via FIOSEEKHOLE, but I am pretty sure FIOSEEKDATA
3253 * will fail for those file systems.)
3255 * For input files that don't support FIOSEEKDATA/FIOSEEKHOLE,
3256 * the code just falls through to the inner copy loop.
3260 error = VOP_IOCTL(invp, FIOSEEKDATA, &startoff, 0,
3262 if (error == ENXIO) {
3263 startoff = endoff = inva.va_size;
3264 eof = holetoeof = true;
3268 if (error == 0 && !holetoeof) {
3270 error = VOP_IOCTL(invp, FIOSEEKHOLE, &endoff, 0,
3273 * Since invp is unlocked, it may be possible for
3274 * another thread to do a truncate(), lseek(), write()
3275 * creating a hole at startoff between the above
3276 * VOP_IOCTL() calls, if the other thread does not do
3278 * If that happens, startoff == endoff and finding
3279 * the hole has failed, so set an error.
3281 if (error == 0 && startoff == endoff)
3282 error = EINVAL; /* Any error. Reset to 0. */
3285 if (startoff > *inoffp) {
3286 /* Found hole before data block. */
3287 xfer = MIN(startoff - *inoffp, len);
3288 if (*outoffp < va.va_size) {
3289 /* Must write 0s to punch hole. */
3290 xfer2 = MIN(va.va_size - *outoffp,
3292 memset(dat, 0, MIN(xfer2, blksize));
3293 error = vn_write_outvp(outvp, dat,
3294 *outoffp, xfer2, blksize, false,
3295 holeout > 0, outcred);
3298 if (error == 0 && *outoffp + xfer >
3299 va.va_size && (xfer == len || holetoeof)) {
3300 /* Grow output file (hole at end). */
3301 error = vn_write_outvp(outvp, dat,
3302 *outoffp, xfer, blksize, true,
3310 interrupted = sig_intr();
3313 copylen = MIN(len, endoff - startoff);
3325 * Set first xfer to end at a block boundary, so that
3326 * holes are more likely detected in the loop below via
3327 * the for all bytes 0 method.
3329 xfer -= (*inoffp % blksize);
3331 /* Loop copying the data block. */
3332 while (copylen > 0 && error == 0 && !eof && interrupted == 0) {
3335 error = vn_lock(invp, LK_SHARED);
3338 error = vn_rdwr(UIO_READ, invp, dat, xfer,
3339 startoff, UIO_SYSSPACE, IO_NODELOCKED,
3340 curthread->td_ucred, incred, &aresid,
3344 if (error == 0 && aresid > 0) {
3345 /* Stop the copy at EOF on the input file. */
3352 * Skip the write for holes past the initial EOF
3353 * of the output file, unless this is the last
3354 * write of the output file at EOF.
3356 readzeros = cantseek ? mem_iszero(dat, xfer) :
3360 if (!cantseek || *outoffp < va.va_size ||
3361 lastblock || !readzeros)
3362 error = vn_write_outvp(outvp, dat,
3363 *outoffp, xfer, blksize,
3364 readzeros && lastblock &&
3365 *outoffp >= va.va_size, false,
3374 interrupted = sig_intr();
3381 *lenp = savlen - len;
3387 vn_fallocate(struct file *fp, off_t offset, off_t len, struct thread *td)
3391 off_t olen, ooffset;
3394 int audited_vnode1 = 0;
3398 if (vp->v_type != VREG)
3401 /* Allocating blocks may take a long time, so iterate. */
3408 error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
3411 error = vn_lock(vp, LK_EXCLUSIVE);
3413 vn_finished_write(mp);
3417 if (!audited_vnode1) {
3418 AUDIT_ARG_VNODE1(vp);
3423 error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
3426 error = VOP_ALLOCATE(vp, &offset, &len);
3428 vn_finished_write(mp);
3430 if (olen + ooffset != offset + len) {
3431 panic("offset + len changed from %jx/%jx to %jx/%jx",
3432 ooffset, olen, offset, len);
3434 if (error != 0 || len == 0)
3436 KASSERT(olen > len, ("Iteration did not make progress?"));
3443 static u_long vn_lock_pair_pause_cnt;
3444 SYSCTL_ULONG(_debug, OID_AUTO, vn_lock_pair_pause, CTLFLAG_RD,
3445 &vn_lock_pair_pause_cnt, 0,
3446 "Count of vn_lock_pair deadlocks");
3448 u_int vn_lock_pair_pause_max;
3449 SYSCTL_UINT(_debug, OID_AUTO, vn_lock_pair_pause_max, CTLFLAG_RW,
3450 &vn_lock_pair_pause_max, 0,
3451 "Max ticks for vn_lock_pair deadlock avoidance sleep");
3454 vn_lock_pair_pause(const char *wmesg)
3456 atomic_add_long(&vn_lock_pair_pause_cnt, 1);
3457 pause(wmesg, prng32_bounded(vn_lock_pair_pause_max));
3461 * Lock pair of vnodes vp1, vp2, avoiding lock order reversal.
3462 * vp1_locked indicates whether vp1 is exclusively locked; if not, vp1
3463 * must be unlocked. Same for vp2 and vp2_locked. One of the vnodes
3466 * The function returns with both vnodes exclusively locked, and
3467 * guarantees that it does not create lock order reversal with other
3468 * threads during its execution. Both vnodes could be unlocked
3469 * temporary (and reclaimed).
3472 vn_lock_pair(struct vnode *vp1, bool vp1_locked, struct vnode *vp2,
3477 if (vp1 == NULL && vp2 == NULL)
3481 ASSERT_VOP_ELOCKED(vp1, "vp1");
3483 ASSERT_VOP_UNLOCKED(vp1, "vp1");
3489 ASSERT_VOP_ELOCKED(vp2, "vp2");
3491 ASSERT_VOP_UNLOCKED(vp2, "vp2");
3495 if (!vp1_locked && !vp2_locked) {
3496 vn_lock(vp1, LK_EXCLUSIVE | LK_RETRY);
3501 if (vp1_locked && vp2_locked)
3503 if (vp1_locked && vp2 != NULL) {
3505 error = VOP_LOCK1(vp2, LK_EXCLUSIVE | LK_NOWAIT,
3506 __FILE__, __LINE__);
3511 vn_lock_pair_pause("vlp1");
3513 vn_lock(vp2, LK_EXCLUSIVE | LK_RETRY);
3516 if (vp2_locked && vp1 != NULL) {
3518 error = VOP_LOCK1(vp1, LK_EXCLUSIVE | LK_NOWAIT,
3519 __FILE__, __LINE__);
3524 vn_lock_pair_pause("vlp2");
3526 vn_lock(vp1, LK_EXCLUSIVE | LK_RETRY);
3531 ASSERT_VOP_ELOCKED(vp1, "vp1 ret");
3533 ASSERT_VOP_ELOCKED(vp2, "vp2 ret");