The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_default.c

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed
    6  * to Berkeley by John Heidemann of the UCLA Ficus project.
    7  *
    8  * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/7.4/sys/kern/vfs_default.c 189766 2009-03-13 10:52:22Z kib $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/bio.h>
   41 #include <sys/buf.h>
   42 #include <sys/conf.h>
   43 #include <sys/event.h>
   44 #include <sys/kernel.h>
   45 #include <sys/limits.h>
   46 #include <sys/lock.h>
   47 #include <sys/lockf.h>
   48 #include <sys/malloc.h>
   49 #include <sys/mount.h>
   50 #include <sys/mutex.h>
   51 #include <sys/unistd.h>
   52 #include <sys/vnode.h>
   53 #include <sys/poll.h>
   54 
   55 #include <vm/vm.h>
   56 #include <vm/vm_object.h>
   57 #include <vm/vm_extern.h>
   58 #include <vm/pmap.h>
   59 #include <vm/vm_map.h>
   60 #include <vm/vm_page.h>
   61 #include <vm/vm_pager.h>
   62 #include <vm/vnode_pager.h>
   63 
   64 static int      vop_nolookup(struct vop_lookup_args *);
   65 static int      vop_nostrategy(struct vop_strategy_args *);
   66 
   67 /*
   68  * This vnode table stores what we want to do if the filesystem doesn't
   69  * implement a particular VOP.
   70  *
   71  * If there is no specific entry here, we will return EOPNOTSUPP.
   72  *
   73  */
   74 
   75 struct vop_vector default_vnodeops = {
   76         .vop_default =          NULL,
   77         .vop_bypass =           VOP_EOPNOTSUPP,
   78 
   79         .vop_advlock =          vop_stdadvlock,
   80         .vop_advlockasync =     vop_stdadvlockasync,
   81         .vop_bmap =             vop_stdbmap,
   82         .vop_close =            VOP_NULL,
   83         .vop_fsync =            VOP_NULL,
   84         .vop_getpages =         vop_stdgetpages,
   85         .vop_getwritemount =    vop_stdgetwritemount,
   86         .vop_inactive =         VOP_NULL,
   87         .vop_ioctl =            VOP_ENOTTY,
   88         .vop_kqfilter =         vop_stdkqfilter,
   89         .vop_islocked =         vop_stdislocked,
   90         .vop_lease =            VOP_NULL,
   91         .vop_lock1 =            vop_stdlock,
   92         .vop_lookup =           vop_nolookup,
   93         .vop_open =             VOP_NULL,
   94         .vop_pathconf =         VOP_EINVAL,
   95         .vop_poll =             vop_nopoll,
   96         .vop_putpages =         vop_stdputpages,
   97         .vop_readlink =         VOP_EINVAL,
   98         .vop_revoke =           VOP_PANIC,
   99         .vop_strategy =         vop_nostrategy,
  100         .vop_unlock =           vop_stdunlock,
  101         .vop_vptofh =           vop_stdvptofh,
  102 };
  103 
  104 /*
  105  * Series of placeholder functions for various error returns for
  106  * VOPs.
  107  */
  108 
  109 int
  110 vop_eopnotsupp(struct vop_generic_args *ap)
  111 {
  112         /*
  113         printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
  114         */
  115 
  116         return (EOPNOTSUPP);
  117 }
  118 
  119 int
  120 vop_ebadf(struct vop_generic_args *ap)
  121 {
  122 
  123         return (EBADF);
  124 }
  125 
  126 int
  127 vop_enotty(struct vop_generic_args *ap)
  128 {
  129 
  130         return (ENOTTY);
  131 }
  132 
  133 int
  134 vop_einval(struct vop_generic_args *ap)
  135 {
  136 
  137         return (EINVAL);
  138 }
  139 
  140 int
  141 vop_null(struct vop_generic_args *ap)
  142 {
  143 
  144         return (0);
  145 }
  146 
  147 /*
  148  * Helper function to panic on some bad VOPs in some filesystems.
  149  */
  150 int
  151 vop_panic(struct vop_generic_args *ap)
  152 {
  153 
  154         panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
  155 }
  156 
  157 /*
  158  * vop_std<something> and vop_no<something> are default functions for use by
  159  * filesystems that need the "default reasonable" implementation for a
  160  * particular operation.
  161  *
  162  * The documentation for the operations they implement exists (if it exists)
  163  * in the VOP_<SOMETHING>(9) manpage (all uppercase).
  164  */
  165 
  166 /*
  167  * Default vop for filesystems that do not support name lookup
  168  */
  169 static int
  170 vop_nolookup(ap)
  171         struct vop_lookup_args /* {
  172                 struct vnode *a_dvp;
  173                 struct vnode **a_vpp;
  174                 struct componentname *a_cnp;
  175         } */ *ap;
  176 {
  177 
  178         *ap->a_vpp = NULL;
  179         return (ENOTDIR);
  180 }
  181 
  182 /*
  183  *      vop_nostrategy:
  184  *
  185  *      Strategy routine for VFS devices that have none.
  186  *
  187  *      BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
  188  *      routine.  Typically this is done for a BIO_READ strategy call.
  189  *      Typically B_INVAL is assumed to already be clear prior to a write
  190  *      and should not be cleared manually unless you just made the buffer
  191  *      invalid.  BIO_ERROR should be cleared either way.
  192  */
  193 
  194 static int
  195 vop_nostrategy (struct vop_strategy_args *ap)
  196 {
  197         printf("No strategy for buffer at %p\n", ap->a_bp);
  198         vprint("vnode", ap->a_vp);
  199         ap->a_bp->b_ioflags |= BIO_ERROR;
  200         ap->a_bp->b_error = EOPNOTSUPP;
  201         bufdone(ap->a_bp);
  202         return (EOPNOTSUPP);
  203 }
  204 
  205 /*
  206  * Advisory record locking support
  207  */
  208 int
  209 vop_stdadvlock(struct vop_advlock_args *ap)
  210 {
  211         struct vnode *vp = ap->a_vp;
  212         struct thread *td = curthread;
  213         struct vattr vattr;
  214         int error;
  215 
  216         vn_lock(vp, LK_SHARED | LK_RETRY, td);
  217         error = VOP_GETATTR(vp, &vattr, td->td_ucred, td);
  218         VOP_UNLOCK(vp, 0, td);
  219         if (error)
  220                 return (error);
  221 
  222         return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
  223 }
  224 
  225 int
  226 vop_stdadvlockasync(struct vop_advlockasync_args *ap)
  227 {
  228         struct vnode *vp = ap->a_vp;
  229         struct thread *td = curthread;
  230         struct vattr vattr;
  231         int error;
  232 
  233         vn_lock(vp, LK_SHARED | LK_RETRY, td);
  234         error = VOP_GETATTR(vp, &vattr, td->td_ucred, td);
  235         VOP_UNLOCK(vp, 0, td);
  236         if (error)
  237                 return (error);
  238 
  239         return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
  240 }
  241 
  242 /*
  243  * vop_stdpathconf:
  244  *
  245  * Standard implementation of POSIX pathconf, to get information about limits
  246  * for a filesystem.
  247  * Override per filesystem for the case where the filesystem has smaller
  248  * limits.
  249  */
  250 int
  251 vop_stdpathconf(ap)
  252         struct vop_pathconf_args /* {
  253         struct vnode *a_vp;
  254         int a_name;
  255         int *a_retval;
  256         } */ *ap;
  257 {
  258 
  259         switch (ap->a_name) {
  260                 case _PC_NAME_MAX:
  261                         *ap->a_retval = NAME_MAX;
  262                         return (0);
  263                 case _PC_PATH_MAX:
  264                         *ap->a_retval = PATH_MAX;
  265                         return (0);
  266                 case _PC_LINK_MAX:
  267                         *ap->a_retval = LINK_MAX;
  268                         return (0);
  269                 case _PC_MAX_CANON:
  270                         *ap->a_retval = MAX_CANON;
  271                         return (0);
  272                 case _PC_MAX_INPUT:
  273                         *ap->a_retval = MAX_INPUT;
  274                         return (0);
  275                 case _PC_PIPE_BUF:
  276                         *ap->a_retval = PIPE_BUF;
  277                         return (0);
  278                 case _PC_CHOWN_RESTRICTED:
  279                         *ap->a_retval = 1;
  280                         return (0);
  281                 case _PC_VDISABLE:
  282                         *ap->a_retval = _POSIX_VDISABLE;
  283                         return (0);
  284                 default:
  285                         return (EINVAL);
  286         }
  287         /* NOTREACHED */
  288 }
  289 
  290 /*
  291  * Standard lock, unlock and islocked functions.
  292  */
  293 int
  294 vop_stdlock(ap)
  295         struct vop_lock1_args /* {
  296                 struct vnode *a_vp;
  297                 int a_flags;
  298                 struct thread *a_td;
  299                 char *file;
  300                 int line;
  301         } */ *ap;
  302 {
  303         struct vnode *vp = ap->a_vp;
  304 
  305         return (_lockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp), ap->a_td, ap->a_file, ap->a_line));
  306 }
  307 
  308 /* See above. */
  309 int
  310 vop_stdunlock(ap)
  311         struct vop_unlock_args /* {
  312                 struct vnode *a_vp;
  313                 int a_flags;
  314                 struct thread *a_td;
  315         } */ *ap;
  316 {
  317         struct vnode *vp = ap->a_vp;
  318 
  319         return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp),
  320             ap->a_td));
  321 }
  322 
  323 /* See above. */
  324 int
  325 vop_stdislocked(ap)
  326         struct vop_islocked_args /* {
  327                 struct vnode *a_vp;
  328                 struct thread *a_td;
  329         } */ *ap;
  330 {
  331 
  332         return (lockstatus(ap->a_vp->v_vnlock, ap->a_td));
  333 }
  334 
  335 /*
  336  * Return true for select/poll.
  337  */
  338 int
  339 vop_nopoll(ap)
  340         struct vop_poll_args /* {
  341                 struct vnode *a_vp;
  342                 int  a_events;
  343                 struct ucred *a_cred;
  344                 struct thread *a_td;
  345         } */ *ap;
  346 {
  347 
  348         return (poll_no_poll(ap->a_events));
  349 }
  350 
  351 /*
  352  * Implement poll for local filesystems that support it.
  353  */
  354 int
  355 vop_stdpoll(ap)
  356         struct vop_poll_args /* {
  357                 struct vnode *a_vp;
  358                 int  a_events;
  359                 struct ucred *a_cred;
  360                 struct thread *a_td;
  361         } */ *ap;
  362 {
  363         if (ap->a_events & ~POLLSTANDARD)
  364                 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
  365         return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
  366 }
  367 
  368 /*
  369  * Return our mount point, as we will take charge of the writes.
  370  */
  371 int
  372 vop_stdgetwritemount(ap)
  373         struct vop_getwritemount_args /* {
  374                 struct vnode *a_vp;
  375                 struct mount **a_mpp;
  376         } */ *ap;
  377 {
  378         struct mount *mp;
  379 
  380         /*
  381          * XXX Since this is called unlocked we may be recycled while
  382          * attempting to ref the mount.  If this is the case or mountpoint
  383          * will be set to NULL.  We only have to prevent this call from
  384          * returning with a ref to an incorrect mountpoint.  It is not
  385          * harmful to return with a ref to our previous mountpoint.
  386          */
  387         mp = ap->a_vp->v_mount;
  388         if (mp != NULL) {
  389                 vfs_ref(mp);
  390                 if (mp != ap->a_vp->v_mount) {
  391                         vfs_rel(mp);
  392                         mp = NULL;
  393                 }
  394         }
  395         *(ap->a_mpp) = mp;
  396         return (0);
  397 }
  398 
  399 /* XXX Needs good comment and VOP_BMAP(9) manpage */
  400 int
  401 vop_stdbmap(ap)
  402         struct vop_bmap_args /* {
  403                 struct vnode *a_vp;
  404                 daddr_t  a_bn;
  405                 struct bufobj **a_bop;
  406                 daddr_t *a_bnp;
  407                 int *a_runp;
  408                 int *a_runb;
  409         } */ *ap;
  410 {
  411 
  412         if (ap->a_bop != NULL)
  413                 *ap->a_bop = &ap->a_vp->v_bufobj;
  414         if (ap->a_bnp != NULL)
  415                 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
  416         if (ap->a_runp != NULL)
  417                 *ap->a_runp = 0;
  418         if (ap->a_runb != NULL)
  419                 *ap->a_runb = 0;
  420         return (0);
  421 }
  422 
  423 int
  424 vop_stdfsync(ap)
  425         struct vop_fsync_args /* {
  426                 struct vnode *a_vp;
  427                 struct ucred *a_cred;
  428                 int a_waitfor;
  429                 struct thread *a_td;
  430         } */ *ap;
  431 {
  432         struct vnode *vp = ap->a_vp;
  433         struct buf *bp;
  434         struct bufobj *bo;
  435         struct buf *nbp;
  436         int error = 0;
  437         int maxretry = 1000;     /* large, arbitrarily chosen */
  438 
  439         VI_LOCK(vp);
  440 loop1:
  441         /*
  442          * MARK/SCAN initialization to avoid infinite loops.
  443          */
  444         TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) {
  445                 bp->b_vflags &= ~BV_SCANNED;
  446                 bp->b_error = 0;
  447         }
  448 
  449         /*
  450          * Flush all dirty buffers associated with a vnode.
  451          */
  452 loop2:
  453         TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
  454                 if ((bp->b_vflags & BV_SCANNED) != 0)
  455                         continue;
  456                 bp->b_vflags |= BV_SCANNED;
  457                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL))
  458                         continue;
  459                 VI_UNLOCK(vp);
  460                 KASSERT(bp->b_bufobj == &vp->v_bufobj,
  461                     ("bp %p wrong b_bufobj %p should be %p",
  462                     bp, bp->b_bufobj, &vp->v_bufobj));
  463                 if ((bp->b_flags & B_DELWRI) == 0)
  464                         panic("fsync: not dirty");
  465                 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
  466                         vfs_bio_awrite(bp);
  467                 } else {
  468                         bremfree(bp);
  469                         bawrite(bp);
  470                 }
  471                 VI_LOCK(vp);
  472                 goto loop2;
  473         }
  474 
  475         /*
  476          * If synchronous the caller expects us to completely resolve all
  477          * dirty buffers in the system.  Wait for in-progress I/O to
  478          * complete (which could include background bitmap writes), then
  479          * retry if dirty blocks still exist.
  480          */
  481         if (ap->a_waitfor == MNT_WAIT) {
  482                 bo = &vp->v_bufobj;
  483                 bufobj_wwait(bo, 0, 0);
  484                 if (bo->bo_dirty.bv_cnt > 0) {
  485                         /*
  486                          * If we are unable to write any of these buffers
  487                          * then we fail now rather than trying endlessly
  488                          * to write them out.
  489                          */
  490                         TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
  491                                 if ((error = bp->b_error) == 0)
  492                                         continue;
  493                         if (error == 0 && --maxretry >= 0)
  494                                 goto loop1;
  495                         error = EAGAIN;
  496                 }
  497         }
  498         VI_UNLOCK(vp);
  499         if (error == EAGAIN)
  500                 vprint("fsync: giving up on dirty", vp);
  501 
  502         return (error);
  503 }
  504 
  505 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
  506 int
  507 vop_stdgetpages(ap)
  508         struct vop_getpages_args /* {
  509                 struct vnode *a_vp;
  510                 vm_page_t *a_m;
  511                 int a_count;
  512                 int a_reqpage;
  513                 vm_ooffset_t a_offset;
  514         } */ *ap;
  515 {
  516 
  517         return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
  518             ap->a_count, ap->a_reqpage);
  519 }
  520 
  521 int
  522 vop_stdkqfilter(struct vop_kqfilter_args *ap)
  523 {
  524         return vfs_kqfilter(ap);
  525 }
  526 
  527 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
  528 int
  529 vop_stdputpages(ap)
  530         struct vop_putpages_args /* {
  531                 struct vnode *a_vp;
  532                 vm_page_t *a_m;
  533                 int a_count;
  534                 int a_sync;
  535                 int *a_rtvals;
  536                 vm_ooffset_t a_offset;
  537         } */ *ap;
  538 {
  539 
  540         return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
  541              ap->a_sync, ap->a_rtvals);
  542 }
  543 
  544 int
  545 vop_stdvptofh(struct vop_vptofh_args *ap)
  546 {
  547         return (EOPNOTSUPP);
  548 }
  549 
  550 /*
  551  * vfs default ops
  552  * used to fill the vfs function table to get reasonable default return values.
  553  */
  554 int
  555 vfs_stdroot (mp, flags, vpp, td)
  556         struct mount *mp;
  557         int flags;
  558         struct vnode **vpp;
  559         struct thread *td;
  560 {
  561 
  562         return (EOPNOTSUPP);
  563 }
  564 
  565 int
  566 vfs_stdstatfs (mp, sbp, td)
  567         struct mount *mp;
  568         struct statfs *sbp;
  569         struct thread *td;
  570 {
  571 
  572         return (EOPNOTSUPP);
  573 }
  574 
  575 int
  576 vfs_stdquotactl (mp, cmds, uid, arg, td)
  577         struct mount *mp;
  578         int cmds;
  579         uid_t uid;
  580         void *arg;
  581         struct thread *td;
  582 {
  583 
  584         return (EOPNOTSUPP);
  585 }
  586 
  587 int
  588 vfs_stdsync(mp, waitfor, td)
  589         struct mount *mp;
  590         int waitfor;
  591         struct thread *td;
  592 {
  593         struct vnode *vp, *mvp;
  594         int error, lockreq, allerror = 0;
  595 
  596         lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
  597         if (waitfor != MNT_WAIT)
  598                 lockreq |= LK_NOWAIT;
  599         /*
  600          * Force stale buffer cache information to be flushed.
  601          */
  602         MNT_ILOCK(mp);
  603 loop:
  604         MNT_VNODE_FOREACH(vp, mp, mvp) {
  605 
  606                 VI_LOCK(vp);
  607                 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
  608                         VI_UNLOCK(vp);
  609                         continue;
  610                 }
  611                 MNT_IUNLOCK(mp);
  612 
  613                 if ((error = vget(vp, lockreq, td)) != 0) {
  614                         MNT_ILOCK(mp);
  615                         if (error == ENOENT) {
  616                                 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
  617                                 goto loop;
  618                         }
  619                         continue;
  620                 }
  621                 error = VOP_FSYNC(vp, waitfor, td);
  622                 if (error)
  623                         allerror = error;
  624 
  625                 /* Do not turn this into vput.  td is not always curthread. */
  626                 VOP_UNLOCK(vp, 0, td);
  627                 vrele(vp);
  628                 MNT_ILOCK(mp);
  629         }
  630         MNT_IUNLOCK(mp);
  631         return (allerror);
  632 }
  633 
  634 int
  635 vfs_stdnosync (mp, waitfor, td)
  636         struct mount *mp;
  637         int waitfor;
  638         struct thread *td;
  639 {
  640 
  641         return (0);
  642 }
  643 
  644 int
  645 vfs_stdvget (mp, ino, flags, vpp)
  646         struct mount *mp;
  647         ino_t ino;
  648         int flags;
  649         struct vnode **vpp;
  650 {
  651 
  652         return (EOPNOTSUPP);
  653 }
  654 
  655 int
  656 vfs_stdfhtovp (mp, fhp, vpp)
  657         struct mount *mp;
  658         struct fid *fhp;
  659         struct vnode **vpp;
  660 {
  661 
  662         return (EOPNOTSUPP);
  663 }
  664 
  665 int
  666 vfs_stdinit (vfsp)
  667         struct vfsconf *vfsp;
  668 {
  669 
  670         return (0);
  671 }
  672 
  673 int
  674 vfs_stduninit (vfsp)
  675         struct vfsconf *vfsp;
  676 {
  677 
  678         return(0);
  679 }
  680 
  681 int
  682 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td)
  683         struct mount *mp;
  684         int cmd;
  685         struct vnode *filename_vp;
  686         int attrnamespace;
  687         const char *attrname;
  688         struct thread *td;
  689 {
  690 
  691         if (filename_vp != NULL)
  692                 VOP_UNLOCK(filename_vp, 0, td);
  693         return (EOPNOTSUPP);
  694 }
  695 
  696 int
  697 vfs_stdsysctl(mp, op, req)
  698         struct mount *mp;
  699         fsctlop_t op;
  700         struct sysctl_req *req;
  701 {
  702 
  703         return (EOPNOTSUPP);
  704 }
  705 
  706 /* end of vfs default ops */

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