386 lines
10 KiB
C
386 lines
10 KiB
C
/*-
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* Copyright (c) 1999, 2000 Boris Popov
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* All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Boris Popov.
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* 4. Neither the name of the author nor the names of any co-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 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.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/mutex.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <netncp/ncp.h>
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#include <netncp/ncp_conn.h>
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#include <netncp/ncp_subr.h>
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#include <fs/nwfs/nwfs.h>
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#include <fs/nwfs/nwfs_mount.h>
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#include <fs/nwfs/nwfs_node.h>
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#include <fs/nwfs/nwfs_subr.h>
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#define NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash])
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static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
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static u_long nwnodehash;
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static struct sx nwhashlock;
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static MALLOC_DEFINE(M_NWNODE, "nwfs_node", "NWFS vnode private part");
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static MALLOC_DEFINE(M_NWFSHASH, "nwfs_hash", "NWFS has table");
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static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS);
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SYSCTL_DECL(_vfs_nwfs);
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SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
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NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
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void
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nwfs_hash_init(void) {
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nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
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sx_init(&nwhashlock, "nwfshl");
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}
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void
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nwfs_hash_free(void) {
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sx_destroy(&nwhashlock);
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free(nwhashtbl, M_NWFSHASH);
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}
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int
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nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS) {
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struct nwnode *np;
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struct nwnode_hash_head *nhpp;
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struct vnode *vp;
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int i;
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if (nwfs_debuglevel == 0)
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return 0;
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printf("Name:uc:hc:fid:pfid\n");
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for(i = 0; i <= nwnodehash; i++) {
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nhpp = &nwhashtbl[i];
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LIST_FOREACH(np, nhpp, n_hash) {
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vp = NWTOV(np);
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vprint("", vp);
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printf("%s:%d:%d:%d:%d\n",np->n_name,vrefcnt(vp),
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vp->v_holdcnt,np->n_fid.f_id, np->n_fid.f_parent);
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}
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}
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return 0;
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}
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/*
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* Search nwnode with given fid.
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* Hash list should be locked by caller.
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*/
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static int
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nwfs_hashlookup(struct nwmount *nmp, ncpfid fid, struct nwnode **npp)
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{
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struct nwnode *np;
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struct nwnode_hash_head *nhpp;
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sx_assert(&nwhashlock, SA_XLOCKED);
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nhpp = NWNOHASH(fid);
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LIST_FOREACH(np, nhpp, n_hash) {
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if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
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continue;
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if (npp)
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*npp = np;
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return 0;
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}
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return ENOENT;
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}
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/*
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* Allocate new nwfsnode/vnode from given nwnode.
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* Vnode referenced and not locked.
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*/
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static int
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nwfs_allocvp(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
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struct vnode *dvp, struct vnode **vpp)
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{
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struct nwnode *np;
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struct nwnode_hash_head *nhpp;
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struct nwmount *nmp = VFSTONWFS(mp);
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struct vnode *vp;
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int error;
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loop:
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sx_xlock(&nwhashlock);
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rescan:
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if (nwfs_hashlookup(nmp, fid, &np) == 0) {
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vp = NWTOV(np);
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mtx_lock(&vp->v_interlock);
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sx_xunlock(&nwhashlock);
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if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, curthread))
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goto loop;
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if (fap)
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np->n_attr = fap->attributes;
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*vpp = vp;
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return(0);
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}
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sx_xunlock(&nwhashlock);
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if (fap == NULL || ((fap->attributes & aDIR) == 0 && dvp == NULL))
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panic("nwfs_allocvp: fap = %p, dvp = %p\n", fap, dvp);
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/*
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* Do the MALLOC before the 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 MALLOC should block.
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*/
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np = malloc(sizeof *np, M_NWNODE, M_WAITOK | M_ZERO);
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error = getnewvnode("nwfs", mp, &nwfs_vnodeops, &vp);
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if (error) {
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*vpp = NULL;
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free(np, M_NWNODE);
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return (error);
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}
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error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */
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if (error != 0) {
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free(np, M_NWNODE);
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*vpp = NULL;
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return (error);
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}
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vp->v_data = np;
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np->n_vnode = vp;
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np->n_mount = nmp;
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np->n_attr = fap->attributes;
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vp->v_type = np->n_attr & aDIR ? VDIR : VREG;
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np->n_fid = fid;
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if (dvp) {
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np->n_parent = VTONW(dvp)->n_fid;
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}
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VN_LOCK_AREC(vp);
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sx_xlock(&nwhashlock);
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/*
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* Another process can create vnode while we blocked in malloc() or
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* getnewvnode(). Rescan list again.
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*/
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if (nwfs_hashlookup(nmp, fid, NULL) == 0) {
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vp->v_data = NULL;
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np->n_vnode = NULL;
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vrele(vp);
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free(np, M_NWNODE);
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goto rescan;
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}
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*vpp = vp;
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nhpp = NWNOHASH(fid);
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LIST_INSERT_HEAD(nhpp, np, n_hash);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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sx_xunlock(&nwhashlock);
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ASSERT_VOP_LOCKED(dvp, "nwfs_allocvp");
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if (vp->v_type == VDIR && dvp && (dvp->v_vflag & VV_ROOT) == 0) {
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np->n_flag |= NREFPARENT;
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vref(dvp);
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}
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return 0;
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}
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int
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nwfs_nget(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
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struct vnode *dvp, struct vnode **vpp)
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{
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struct vnode *vp;
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int error;
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*vpp = NULL;
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error = nwfs_allocvp(mp, fid, fap, dvp, &vp);
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if (error)
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return error;
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if (fap)
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nwfs_attr_cacheenter(vp, fap);
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*vpp = vp;
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return 0;
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}
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int
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nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td,
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struct nwnode **npp)
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{
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int error;
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sx_xlock(&nwhashlock);
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error = nwfs_hashlookup(nmp, fid, npp);
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sx_xunlock(&nwhashlock);
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return error;
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}
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/*
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* Free nwnode, and give vnode back to system
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*/
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int
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nwfs_reclaim(ap)
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *dvp = NULL, *vp = ap->a_vp;
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struct nwnode *dnp, *np = VTONW(vp);
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struct nwmount *nmp = VTONWFS(vp);
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struct thread *td = ap->a_td;
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NCPVNDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
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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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if (np->n_flag & NREFPARENT) {
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np->n_flag &= ~NREFPARENT;
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if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) {
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dvp = dnp->n_vnode;
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} else {
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NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
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}
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}
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sx_xlock(&nwhashlock);
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LIST_REMOVE(np, n_hash);
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sx_xunlock(&nwhashlock);
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if (nmp->n_root == np) {
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nmp->n_root = NULL;
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}
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vp->v_data = NULL;
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free(np, M_NWNODE);
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if (dvp) {
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vrele(dvp);
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}
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return (0);
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}
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int
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nwfs_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct thread *a_td;
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} */ *ap;
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{
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struct thread *td = ap->a_td;
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struct ucred *cred = td->td_ucred;
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struct vnode *vp = ap->a_vp;
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struct nwnode *np = VTONW(vp);
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int error;
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NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp));
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if (np->opened) {
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error = nwfs_vinvalbuf(vp, td);
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error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred);
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np->opened = 0;
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}
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if (np->n_flag & NSHOULDFREE) {
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cache_purge(vp);
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vgone(vp);
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}
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return (0);
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}
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/*
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* routines to maintain vnode attributes cache
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* nwfs_attr_cacheenter: unpack np.i to va structure
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*/
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void
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nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi)
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{
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struct nwnode *np = VTONW(vp);
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struct nwmount *nmp = VTONWFS(vp);
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struct vattr *va = &np->n_vattr;
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va->va_type = vp->v_type; /* vnode type (for create) */
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np->n_nmlen = fi->nameLen;
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bcopy(fi->entryName, np->n_name, np->n_nmlen);
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np->n_name[fi->nameLen] = 0;
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if (vp->v_type == VREG) {
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if (va->va_size != fi->dataStreamSize) {
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va->va_size = fi->dataStreamSize;
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vnode_pager_setsize(vp, va->va_size);
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}
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va->va_mode = nmp->m.file_mode; /* files access mode and type */
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} else if (vp->v_type == VDIR) {
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va->va_size = 16384; /* should be a better way ... */
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va->va_mode = nmp->m.dir_mode; /* files access mode and type */
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} else
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return;
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np->n_size = va->va_size;
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va->va_nlink = 1; /* number of references to file */
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va->va_uid = nmp->m.uid; /* owner user id */
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va->va_gid = nmp->m.gid; /* owner group id */
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va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
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va->va_fileid = np->n_fid.f_id; /* file id */
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if (va->va_fileid == 0)
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va->va_fileid = NWFS_ROOT_INO;
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va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
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/* time of last modification */
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ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime);
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/* time of last access */
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ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime);
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va->va_ctime = va->va_mtime; /* time file changed */
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va->va_gen = VNOVAL; /* generation number of file */
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va->va_flags = 0; /* flags defined for file */
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va->va_rdev = VNOVAL; /* device the special file represents */
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va->va_bytes = va->va_size; /* bytes of disk space held by file */
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va->va_filerev = 0; /* file modification number */
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va->va_vaflags = 0; /* operations flags */
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np->n_vattr = *va;
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if (np->n_mtime == 0) {
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np->n_mtime = va->va_mtime.tv_sec;
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}
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np->n_atime = time_second;
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np->n_dosfid = fi->DosDirNum;
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return;
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}
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int
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nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
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{
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struct nwnode *np = VTONW(vp);
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int diff;
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diff = time_second - np->n_atime;
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if (diff > 2) { /* XXX should be configurable */
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return ENOENT;
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}
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*va = np->n_vattr;
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return 0;
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}
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