e3d34903b6
support for NFSv4 as well as NFSv2 and 3. It lives in 3 subdirs under sys/fs: nfs - functions that are common to the client and server nfsclient - a mutation of sys/nfsclient that call generic functions to do RPCs and handle state. As such, it retains the buffer cache handling characteristics and vnode semantics that are found in sys/nfsclient, for the most part. nfsserver - the server. It includes a DRC designed specifically for NFSv4, that is used instead of the generic DRC in sys/rpc. The build glue will be checked in later, so at this point, it consists of 3 new subdirs that should not affect kernel building. Approved by: kib (mentor)
284 lines
7.3 KiB
C
284 lines
7.3 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from nfs_node.c 8.6 (Berkeley) 5/22/95
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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/systm.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <vm/uma.h>
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#include <fs/nfs/nfsport.h>
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#include <fs/nfsclient/nfsnode.h>
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#include <fs/nfsclient/nfsmount.h>
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#include <fs/nfsclient/nfs.h>
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extern struct vop_vector newnfs_vnodeops;
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extern struct buf_ops buf_ops_newnfs;
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MALLOC_DECLARE(M_NEWNFSREQ);
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uma_zone_t newnfsnode_zone;
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vop_reclaim_t *ncl_reclaim_p = NULL;
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void
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ncl_nhinit(void)
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{
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newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL,
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NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
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}
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void
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ncl_nhuninit(void)
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{
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uma_zdestroy(newnfsnode_zone);
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}
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/*
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* ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this
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* function is going to be used to get Regular Files, code must be added
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* to fill in the "struct nfsv4node".
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* Look up a vnode/nfsnode by file handle.
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* Callers must check for mount points!!
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* In all cases, a pointer to a
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* nfsnode structure is returned.
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*/
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int
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ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp)
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{
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struct thread *td = curthread; /* XXX */
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struct nfsnode *np;
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struct vnode *vp;
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struct vnode *nvp;
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int error;
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u_int hash;
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struct nfsmount *nmp;
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struct nfsfh *nfhp;
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nmp = VFSTONFS(mntp);
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*npp = NULL;
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hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
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MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
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M_NFSFH, M_WAITOK);
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bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
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nfhp->nfh_len = fhsize;
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error = vfs_hash_get(mntp, hash, LK_EXCLUSIVE,
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td, &nvp, newnfs_vncmpf, nfhp);
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FREE(nfhp, M_NFSFH);
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if (error)
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return (error);
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if (nvp != NULL) {
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*npp = VTONFS(nvp);
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return (0);
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}
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/*
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* Allocate before getnewvnode since doing so afterward
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* might cause a bogus v_data pointer to get dereferenced
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* elsewhere if zalloc should block.
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*/
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np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
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error = getnewvnode("newnfs", mntp, &newnfs_vnodeops, &nvp);
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if (error) {
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uma_zfree(newnfsnode_zone, np);
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return (error);
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}
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vp = nvp;
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vp->v_bufobj.bo_ops = &buf_ops_newnfs;
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vp->v_data = np;
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np->n_vnode = vp;
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/*
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* Initialize the mutex even if the vnode is going to be a loser.
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* This simplifies the logic in reclaim, which can then unconditionally
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* destroy the mutex (in the case of the loser, or if hash_insert
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* happened to return an error no special casing is needed).
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*/
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mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
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/*
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* NFS supports recursive and shared locking.
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*/
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VN_LOCK_AREC(vp);
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VN_LOCK_ASHARE(vp);
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/*
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* Are we getting the root? If so, make sure the vnode flags
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* are correct
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*/
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if ((fhsize == nmp->nm_fhsize) &&
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!bcmp(fhp, nmp->nm_fh, fhsize)) {
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if (vp->v_type == VNON)
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vp->v_type = VDIR;
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vp->v_vflag |= VV_ROOT;
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}
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MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize,
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M_NFSFH, M_WAITOK);
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bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
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np->n_fhp->nfh_len = fhsize;
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lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
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error = insmntque(vp, mntp);
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if (error != 0) {
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*npp = NULL;
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FREE((caddr_t)np->n_fhp, M_NFSFH);
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mtx_destroy(&np->n_mtx);
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uma_zfree(newnfsnode_zone, np);
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return (error);
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}
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error = vfs_hash_insert(vp, hash, LK_EXCLUSIVE,
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td, &nvp, newnfs_vncmpf, np->n_fhp);
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if (error)
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return (error);
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if (nvp != NULL) {
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*npp = VTONFS(nvp);
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/* vfs_hash_insert() vput()'s the losing vnode */
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return (0);
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}
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*npp = np;
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return (0);
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}
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int
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ncl_inactive(struct vop_inactive_args *ap)
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{
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struct nfsnode *np;
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struct sillyrename *sp;
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struct thread *td = curthread; /* XXX */
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np = VTONFS(ap->a_vp);
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if (prtactive && vrefcnt(ap->a_vp) != 0)
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vprint("ncl_inactive: pushing active", ap->a_vp);
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if (ap->a_vp->v_type != VDIR) {
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sp = np->n_sillyrename;
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np->n_sillyrename = NULL;
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} else
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sp = NULL;
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if (sp) {
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(void)ncl_vinvalbuf(ap->a_vp, 0, td, 1);
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/*
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* Remove the silly file that was rename'd earlier
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*/
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ncl_removeit(sp, ap->a_vp);
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crfree(sp->s_cred);
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vrele(sp->s_dvp);
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FREE((caddr_t)sp, M_NEWNFSREQ);
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}
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np->n_flag &= NMODIFIED;
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return (0);
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}
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/*
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* Reclaim an nfsnode so that it can be used for other purposes.
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*/
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int
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ncl_reclaim(struct vop_reclaim_args *ap)
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{
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struct vnode *vp = ap->a_vp;
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struct nfsnode *np = VTONFS(vp);
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struct nfsdmap *dp, *dp2;
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if (prtactive && vrefcnt(vp) != 0)
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vprint("ncl_reclaim: pushing active", vp);
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/*
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* If the NLM is running, give it a chance to abort pending
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* locks.
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*/
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if (ncl_reclaim_p)
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ncl_reclaim_p(ap);
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/*
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* Destroy the vm object and flush associated pages.
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*/
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vnode_destroy_vobject(vp);
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vfs_hash_remove(vp);
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/*
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* Call nfscl_reclaimnode() to save attributes in the delegation,
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* as required.
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*/
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if (vp->v_type == VREG)
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nfscl_reclaimnode(vp);
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/*
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* Free up any directory cookie structures and
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* large file handle structures that might be associated with
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* this nfs node.
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*/
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if (vp->v_type == VDIR) {
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dp = LIST_FIRST(&np->n_cookies);
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while (dp) {
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dp2 = dp;
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dp = LIST_NEXT(dp, ndm_list);
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FREE((caddr_t)dp2, M_NFSDIROFF);
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}
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}
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FREE((caddr_t)np->n_fhp, M_NFSFH);
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if (np->n_v4 != NULL)
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FREE((caddr_t)np->n_v4, M_NFSV4NODE);
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mtx_destroy(&np->n_mtx);
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uma_zfree(newnfsnode_zone, vp->v_data);
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vp->v_data = NULL;
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return (0);
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}
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/*
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* Invalidate both the access and attribute caches for this vnode.
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*/
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void
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ncl_invalcaches(struct vnode *vp)
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{
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struct nfsnode *np = VTONFS(vp);
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int i;
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mtx_lock(&np->n_mtx);
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
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np->n_accesscache[i].stamp = 0;
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np->n_attrstamp = 0;
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mtx_unlock(&np->n_mtx);
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}
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