c12582546e
MFC after: 1 month
716 lines
16 KiB
C
716 lines
16 KiB
C
/*-
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* Copyright (c) 2014 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/condvar.h>
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#include <sys/dirent.h>
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#include <sys/fcntl.h>
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#include <sys/lock.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/signalvar.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/taskqueue.h>
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#include <sys/tree.h>
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#include <sys/vnode.h>
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#include <machine/atomic.h>
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#include <vm/uma.h>
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#include <fs/autofs/autofs.h>
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static int autofs_trigger_vn(struct vnode *vp, const char *path,
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int pathlen, struct vnode **newvp);
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extern struct autofs_softc *autofs_softc;
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static int
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autofs_access(struct vop_access_args *ap)
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{
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/*
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* Nothing to do here; the only kind of access control
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* needed is in autofs_mkdir().
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*/
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return (0);
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}
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static int
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autofs_getattr(struct vop_getattr_args *ap)
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{
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struct vnode *vp, *newvp;
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struct autofs_node *anp;
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struct mount *mp;
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struct vattr *vap;
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int error;
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vp = ap->a_vp;
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anp = vp->v_data;
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mp = vp->v_mount;
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vap = ap->a_vap;
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KASSERT(ap->a_vp->v_type == VDIR, ("!VDIR"));
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/*
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* The reason we must do this is that some tree-walking software,
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* namely fts(3), assumes that stat(".") results will not change
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* between chdir("subdir") and chdir(".."), and fails with ENOENT
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* otherwise.
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*/
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if (autofs_mount_on_stat && autofs_cached(anp, NULL, 0) == false &&
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autofs_ignore_thread(curthread) == false) {
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error = autofs_trigger_vn(vp, "", 0, &newvp);
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if (error != 0)
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return (error);
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if (newvp != NULL) {
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error = VOP_GETATTR(newvp, ap->a_vap,
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ap->a_cred);
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vput(newvp);
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return (error);
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}
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}
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vap->va_type = VDIR;
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vap->va_mode = 0755;
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vap->va_nlink = 3; /* XXX */
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vap->va_uid = 0;
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vap->va_gid = 0;
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vap->va_rdev = NODEV;
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vap->va_fsid = mp->mnt_stat.f_fsid.val[0];
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vap->va_fileid = anp->an_fileno;
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vap->va_size = S_BLKSIZE;
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vap->va_blocksize = S_BLKSIZE;
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vap->va_mtime = anp->an_ctime;
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vap->va_atime = anp->an_ctime;
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vap->va_ctime = anp->an_ctime;
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vap->va_birthtime = anp->an_ctime;
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vap->va_gen = 0;
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vap->va_flags = 0;
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vap->va_rdev = 0;
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vap->va_bytes = S_BLKSIZE;
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vap->va_filerev = 0;
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vap->va_spare = 0;
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return (0);
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}
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/*
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* Unlock the vnode, request automountd(8) action, and then lock it back.
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* If anything got mounted on top of the vnode, return the new filesystem's
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* root vnode in 'newvp', locked.
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*/
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static int
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autofs_trigger_vn(struct vnode *vp, const char *path, int pathlen,
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struct vnode **newvp)
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{
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struct autofs_node *anp;
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int error, lock_flags;
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anp = vp->v_data;
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/*
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* Release the vnode lock, so that other operations, in partcular
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* mounting a filesystem on top of it, can proceed. Increase use
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* count, to prevent the vnode from being deallocated and to prevent
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* filesystem from being unmounted.
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*/
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lock_flags = VOP_ISLOCKED(vp);
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vref(vp);
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VOP_UNLOCK(vp, 0);
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sx_xlock(&autofs_softc->sc_lock);
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/*
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* XXX: Workaround for mounting the same thing multiple times; revisit.
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*/
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if (vp->v_mountedhere != NULL) {
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error = 0;
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goto mounted;
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}
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error = autofs_trigger(anp, path, pathlen);
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mounted:
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sx_xunlock(&autofs_softc->sc_lock);
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vn_lock(vp, lock_flags | LK_RETRY);
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vunref(vp);
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if ((vp->v_iflag & VI_DOOMED) != 0) {
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AUTOFS_DEBUG("VI_DOOMED");
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return (ENOENT);
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}
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if (error != 0)
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return (error);
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if (vp->v_mountedhere == NULL) {
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*newvp = NULL;
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return (0);
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} else {
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/*
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* If the operation that succeeded was mount, then mark
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* the node as non-cached. Otherwise, if someone unmounts
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* the filesystem before the cache times out, we will fail
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* to trigger.
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*/
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anp->an_cached = false;
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}
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error = VFS_ROOT(vp->v_mountedhere, lock_flags, newvp);
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if (error != 0) {
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AUTOFS_WARN("VFS_ROOT() failed with error %d", error);
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return (error);
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}
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return (0);
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}
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static int
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autofs_vget_callback(struct mount *mp, void *arg, int flags,
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struct vnode **vpp)
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{
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return (autofs_node_vn(arg, mp, flags, vpp));
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}
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static int
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autofs_lookup(struct vop_lookup_args *ap)
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{
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struct vnode *dvp, *newvp, **vpp;
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struct mount *mp;
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struct autofs_mount *amp;
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struct autofs_node *anp, *child;
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struct componentname *cnp;
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int error;
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dvp = ap->a_dvp;
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vpp = ap->a_vpp;
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mp = dvp->v_mount;
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amp = VFSTOAUTOFS(mp);
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anp = dvp->v_data;
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cnp = ap->a_cnp;
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if (cnp->cn_flags & ISDOTDOT) {
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KASSERT(anp->an_parent != NULL, ("NULL parent"));
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/*
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* Note that in this case, dvp is the child vnode, and we
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* are looking up the parent vnode - exactly reverse from
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* normal operation. Unlocking dvp requires some rather
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* tricky unlock/relock dance to prevent mp from being freed;
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* use vn_vget_ino_gen() which takes care of all that.
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*/
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error = vn_vget_ino_gen(dvp, autofs_vget_callback,
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anp->an_parent, cnp->cn_lkflags, vpp);
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if (error != 0) {
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AUTOFS_WARN("vn_vget_ino_gen() failed with error %d",
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error);
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return (error);
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}
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return (error);
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}
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if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
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vref(dvp);
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*vpp = dvp;
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return (0);
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}
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if (autofs_cached(anp, cnp->cn_nameptr, cnp->cn_namelen) == false &&
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autofs_ignore_thread(cnp->cn_thread) == false) {
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error = autofs_trigger_vn(dvp,
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cnp->cn_nameptr, cnp->cn_namelen, &newvp);
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if (error != 0)
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return (error);
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if (newvp != NULL) {
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/*
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* The target filesystem got automounted.
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* Let the lookup(9) go around with the same
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* path component.
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*/
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vput(newvp);
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return (ERELOOKUP);
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}
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}
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AUTOFS_SLOCK(amp);
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error = autofs_node_find(anp, cnp->cn_nameptr, cnp->cn_namelen, &child);
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if (error != 0) {
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if ((cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == CREATE) {
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AUTOFS_SUNLOCK(amp);
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return (EJUSTRETURN);
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}
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AUTOFS_SUNLOCK(amp);
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return (ENOENT);
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}
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/*
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* XXX: Dropping the node here is ok, because we never remove nodes.
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*/
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AUTOFS_SUNLOCK(amp);
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error = autofs_node_vn(child, mp, cnp->cn_lkflags, vpp);
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if (error != 0) {
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if ((cnp->cn_flags & ISLASTCN) && cnp->cn_nameiop == CREATE)
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return (EJUSTRETURN);
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return (error);
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}
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return (0);
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}
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static int
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autofs_mkdir(struct vop_mkdir_args *ap)
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{
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struct vnode *vp;
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struct autofs_node *anp;
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struct autofs_mount *amp;
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struct autofs_node *child;
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int error;
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vp = ap->a_dvp;
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anp = vp->v_data;
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amp = VFSTOAUTOFS(vp->v_mount);
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/*
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* Do not allow mkdir() if the calling thread is not
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* automountd(8) descendant.
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*/
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if (autofs_ignore_thread(curthread) == false)
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return (EPERM);
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AUTOFS_XLOCK(amp);
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error = autofs_node_new(anp, amp, ap->a_cnp->cn_nameptr,
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ap->a_cnp->cn_namelen, &child);
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if (error != 0) {
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AUTOFS_XUNLOCK(amp);
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return (error);
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}
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AUTOFS_XUNLOCK(amp);
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error = autofs_node_vn(child, vp->v_mount, LK_EXCLUSIVE, ap->a_vpp);
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return (error);
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}
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static int
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autofs_print(struct vop_print_args *ap)
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{
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struct vnode *vp;
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struct autofs_node *anp;
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vp = ap->a_vp;
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anp = vp->v_data;
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printf(" name \"%s\", fileno %d, cached %d, wildcards %d\n",
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anp->an_name, anp->an_fileno, anp->an_cached, anp->an_wildcards);
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return (0);
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}
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/*
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* Write out a single 'struct dirent', based on 'name' and 'fileno' arguments.
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*/
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static int
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autofs_readdir_one(struct uio *uio, const char *name, int fileno,
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size_t *reclenp)
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{
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struct dirent dirent;
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size_t namlen, padded_namlen, reclen;
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int error;
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namlen = strlen(name);
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padded_namlen = roundup2(namlen + 1, __alignof(struct dirent));
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KASSERT(padded_namlen <= MAXNAMLEN, ("%zd > MAXNAMLEN", padded_namlen));
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reclen = offsetof(struct dirent, d_name) + padded_namlen;
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if (reclenp != NULL)
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*reclenp = reclen;
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if (uio == NULL)
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return (0);
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if (uio->uio_resid < reclen)
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return (EINVAL);
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dirent.d_fileno = fileno;
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dirent.d_reclen = reclen;
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dirent.d_type = DT_DIR;
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dirent.d_namlen = namlen;
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memcpy(dirent.d_name, name, namlen);
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memset(dirent.d_name + namlen, 0, padded_namlen - namlen);
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error = uiomove(&dirent, reclen, uio);
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return (error);
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}
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static size_t
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autofs_dirent_reclen(const char *name)
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{
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size_t reclen;
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(void)autofs_readdir_one(NULL, name, -1, &reclen);
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return (reclen);
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}
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static int
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autofs_readdir(struct vop_readdir_args *ap)
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{
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struct vnode *vp, *newvp;
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struct autofs_mount *amp;
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struct autofs_node *anp, *child;
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struct uio *uio;
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size_t reclen, reclens;
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ssize_t initial_resid;
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int error;
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vp = ap->a_vp;
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amp = VFSTOAUTOFS(vp->v_mount);
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anp = vp->v_data;
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uio = ap->a_uio;
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initial_resid = ap->a_uio->uio_resid;
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KASSERT(vp->v_type == VDIR, ("!VDIR"));
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if (autofs_cached(anp, NULL, 0) == false &&
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autofs_ignore_thread(curthread) == false) {
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error = autofs_trigger_vn(vp, "", 0, &newvp);
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if (error != 0)
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return (error);
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if (newvp != NULL) {
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error = VOP_READDIR(newvp, ap->a_uio, ap->a_cred,
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ap->a_eofflag, ap->a_ncookies, ap->a_cookies);
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vput(newvp);
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return (error);
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}
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}
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if (uio->uio_offset < 0)
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return (EINVAL);
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if (ap->a_eofflag != NULL)
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*ap->a_eofflag = FALSE;
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/*
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* Write out the directory entry for ".". This is conditional
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* on the current offset into the directory; same applies to the
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* other two cases below.
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*/
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if (uio->uio_offset == 0) {
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error = autofs_readdir_one(uio, ".", anp->an_fileno, &reclen);
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if (error != 0)
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goto out;
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}
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reclens = autofs_dirent_reclen(".");
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/*
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* Write out the directory entry for "..".
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*/
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if (uio->uio_offset <= reclens) {
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if (uio->uio_offset != reclens)
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return (EINVAL);
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if (anp->an_parent == NULL) {
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error = autofs_readdir_one(uio, "..",
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anp->an_fileno, &reclen);
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} else {
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error = autofs_readdir_one(uio, "..",
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anp->an_parent->an_fileno, &reclen);
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}
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if (error != 0)
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goto out;
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}
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reclens += autofs_dirent_reclen("..");
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/*
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* Write out the directory entries for subdirectories.
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*/
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AUTOFS_SLOCK(amp);
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RB_FOREACH(child, autofs_node_tree, &anp->an_children) {
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/*
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* Check the offset to skip entries returned by previous
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* calls to getdents().
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*/
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if (uio->uio_offset > reclens) {
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reclens += autofs_dirent_reclen(child->an_name);
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continue;
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}
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/*
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* Prevent seeking into the middle of dirent.
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*/
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if (uio->uio_offset != reclens) {
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AUTOFS_SUNLOCK(amp);
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return (EINVAL);
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}
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error = autofs_readdir_one(uio, child->an_name,
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child->an_fileno, &reclen);
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reclens += reclen;
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if (error != 0) {
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AUTOFS_SUNLOCK(amp);
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goto out;
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}
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}
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AUTOFS_SUNLOCK(amp);
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if (ap->a_eofflag != NULL)
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*ap->a_eofflag = TRUE;
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return (0);
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out:
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/*
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* Return error if the initial buffer was too small to do anything.
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*/
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if (uio->uio_resid == initial_resid)
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return (error);
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/*
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* Don't return an error if we managed to copy out some entries.
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*/
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if (uio->uio_resid < reclen)
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return (0);
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return (error);
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}
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static int
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autofs_reclaim(struct vop_reclaim_args *ap)
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{
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struct vnode *vp;
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struct autofs_node *anp;
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vp = ap->a_vp;
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anp = vp->v_data;
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/*
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* We do not free autofs_node here; instead we are
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* destroying them in autofs_node_delete().
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*/
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sx_xlock(&anp->an_vnode_lock);
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anp->an_vnode = NULL;
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|
vp->v_data = NULL;
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
|
|
return (0);
|
|
}
|
|
|
|
struct vop_vector autofs_vnodeops = {
|
|
.vop_default = &default_vnodeops,
|
|
|
|
.vop_access = autofs_access,
|
|
.vop_lookup = autofs_lookup,
|
|
.vop_create = VOP_EOPNOTSUPP,
|
|
.vop_getattr = autofs_getattr,
|
|
.vop_link = VOP_EOPNOTSUPP,
|
|
.vop_mkdir = autofs_mkdir,
|
|
.vop_mknod = VOP_EOPNOTSUPP,
|
|
.vop_print = autofs_print,
|
|
.vop_read = VOP_EOPNOTSUPP,
|
|
.vop_readdir = autofs_readdir,
|
|
.vop_remove = VOP_EOPNOTSUPP,
|
|
.vop_rename = VOP_EOPNOTSUPP,
|
|
.vop_rmdir = VOP_EOPNOTSUPP,
|
|
.vop_setattr = VOP_EOPNOTSUPP,
|
|
.vop_symlink = VOP_EOPNOTSUPP,
|
|
.vop_write = VOP_EOPNOTSUPP,
|
|
.vop_reclaim = autofs_reclaim,
|
|
};
|
|
|
|
int
|
|
autofs_node_new(struct autofs_node *parent, struct autofs_mount *amp,
|
|
const char *name, int namelen, struct autofs_node **anpp)
|
|
{
|
|
struct autofs_node *anp;
|
|
|
|
if (parent != NULL) {
|
|
AUTOFS_ASSERT_XLOCKED(parent->an_mount);
|
|
|
|
KASSERT(autofs_node_find(parent, name, namelen, NULL) == ENOENT,
|
|
("node \"%s\" already exists", name));
|
|
}
|
|
|
|
anp = uma_zalloc(autofs_node_zone, M_WAITOK | M_ZERO);
|
|
if (namelen >= 0)
|
|
anp->an_name = strndup(name, namelen, M_AUTOFS);
|
|
else
|
|
anp->an_name = strdup(name, M_AUTOFS);
|
|
anp->an_fileno = atomic_fetchadd_int(&->am_last_fileno, 1);
|
|
callout_init(&anp->an_callout, 1);
|
|
/*
|
|
* The reason for SX_NOWITNESS here is that witness(4)
|
|
* cannot tell vnodes apart, so the following perfectly
|
|
* valid lock order...
|
|
*
|
|
* vnode lock A -> autofsvlk B -> vnode lock B
|
|
*
|
|
* ... gets reported as a LOR.
|
|
*/
|
|
sx_init_flags(&anp->an_vnode_lock, "autofsvlk", SX_NOWITNESS);
|
|
getnanotime(&anp->an_ctime);
|
|
anp->an_parent = parent;
|
|
anp->an_mount = amp;
|
|
if (parent != NULL)
|
|
RB_INSERT(autofs_node_tree, &parent->an_children, anp);
|
|
RB_INIT(&anp->an_children);
|
|
|
|
*anpp = anp;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
autofs_node_find(struct autofs_node *parent, const char *name,
|
|
int namelen, struct autofs_node **anpp)
|
|
{
|
|
struct autofs_node *anp, find;
|
|
int error;
|
|
|
|
AUTOFS_ASSERT_LOCKED(parent->an_mount);
|
|
|
|
if (namelen >= 0)
|
|
find.an_name = strndup(name, namelen, M_AUTOFS);
|
|
else
|
|
find.an_name = strdup(name, M_AUTOFS);
|
|
|
|
anp = RB_FIND(autofs_node_tree, &parent->an_children, &find);
|
|
if (anp != NULL) {
|
|
error = 0;
|
|
if (anpp != NULL)
|
|
*anpp = anp;
|
|
} else {
|
|
error = ENOENT;
|
|
}
|
|
|
|
free(find.an_name, M_AUTOFS);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
autofs_node_delete(struct autofs_node *anp)
|
|
{
|
|
struct autofs_node *parent;
|
|
|
|
AUTOFS_ASSERT_XLOCKED(anp->an_mount);
|
|
KASSERT(RB_EMPTY(&anp->an_children), ("have children"));
|
|
|
|
callout_drain(&anp->an_callout);
|
|
|
|
parent = anp->an_parent;
|
|
if (parent != NULL)
|
|
RB_REMOVE(autofs_node_tree, &parent->an_children, anp);
|
|
sx_destroy(&anp->an_vnode_lock);
|
|
free(anp->an_name, M_AUTOFS);
|
|
uma_zfree(autofs_node_zone, anp);
|
|
}
|
|
|
|
int
|
|
autofs_node_vn(struct autofs_node *anp, struct mount *mp, int flags,
|
|
struct vnode **vpp)
|
|
{
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
AUTOFS_ASSERT_UNLOCKED(anp->an_mount);
|
|
|
|
sx_xlock(&anp->an_vnode_lock);
|
|
|
|
vp = anp->an_vnode;
|
|
if (vp != NULL) {
|
|
error = vget(vp, flags | LK_RETRY, curthread);
|
|
if (error != 0) {
|
|
AUTOFS_WARN("vget failed with error %d", error);
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
return (error);
|
|
}
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
/*
|
|
* We got forcibly unmounted.
|
|
*/
|
|
AUTOFS_DEBUG("doomed vnode");
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
vput(vp);
|
|
|
|
return (ENOENT);
|
|
}
|
|
|
|
*vpp = vp;
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
return (0);
|
|
}
|
|
|
|
error = getnewvnode("autofs", mp, &autofs_vnodeops, &vp);
|
|
if (error != 0) {
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
return (error);
|
|
}
|
|
|
|
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
if (error != 0) {
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
vdrop(vp);
|
|
return (error);
|
|
}
|
|
|
|
vp->v_type = VDIR;
|
|
if (anp->an_parent == NULL)
|
|
vp->v_vflag |= VV_ROOT;
|
|
vp->v_data = anp;
|
|
|
|
VN_LOCK_ASHARE(vp);
|
|
|
|
error = insmntque(vp, mp);
|
|
if (error != 0) {
|
|
AUTOFS_DEBUG("insmntque() failed with error %d", error);
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
return (error);
|
|
}
|
|
|
|
KASSERT(anp->an_vnode == NULL, ("lost race"));
|
|
anp->an_vnode = vp;
|
|
|
|
sx_xunlock(&anp->an_vnode_lock);
|
|
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|