freebsd-dev/sys/fs/nwfs/nwfs_node.c
Alfred Perlstein 92e73f5711 I ran into an nfs client panic a couple of times in a row over the
last few days.  I tracked it down to the fact that nfs_reclaim()
is setting vp->v_data to NULL _before_ calling vnode_destroy_object().
After silence from the mailing list I checked further and discovered
that ufs_reclaim() is unique among FreeBSD filesystems for calling
vnode_destroy_object() early, long before tossing v_data or much
of anything else, for that matter.  The rest, including NFS, appear
to be identical, as if they were just clones of one original routine.

The enclosed patch fixes all file systems in essentially the same
way, by moving the call to vnode_destroy_object() to early in the
routine (before the call to vfs_hash_remove(), if any).  I have
only tested NFS, but I've now run for over eighteen hours with the
patch where I wouldn't get past four or five without it.

Submitted by: Frank Mayhar
Requested by: Mohan Srinivasan
MFC After: 1 week
2006-01-17 17:29:03 +00:00

378 lines
10 KiB
C

/*-
* Copyright (c) 1999, 2000 Boris Popov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_page.h>
#include <vm/vm_object.h>
#include <netncp/ncp.h>
#include <netncp/ncp_conn.h>
#include <netncp/ncp_subr.h>
#include <fs/nwfs/nwfs.h>
#include <fs/nwfs/nwfs_mount.h>
#include <fs/nwfs/nwfs_node.h>
#include <fs/nwfs/nwfs_subr.h>
#define NWNOHASH(fhsum) (&nwhashtbl[(fhsum.f_id) & nwnodehash])
static LIST_HEAD(nwnode_hash_head,nwnode) *nwhashtbl;
static u_long nwnodehash;
static struct lock nwhashlock;
static MALLOC_DEFINE(M_NWNODE, "nwfs_node", "NWFS vnode private part");
static MALLOC_DEFINE(M_NWFSHASH, "nwfs_hash", "NWFS has table");
static int nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS);
SYSCTL_DECL(_vfs_nwfs);
SYSCTL_PROC(_vfs_nwfs, OID_AUTO, vnprint, CTLFLAG_WR|CTLTYPE_OPAQUE,
NULL, 0, nwfs_sysctl_vnprint, "S,vnlist", "vnode hash");
void
nwfs_hash_init(void) {
nwhashtbl = hashinit(desiredvnodes, M_NWFSHASH, &nwnodehash);
lockinit(&nwhashlock, PVFS, "nwfshl", 0, 0);
}
void
nwfs_hash_free(void) {
lockdestroy(&nwhashlock);
free(nwhashtbl, M_NWFSHASH);
}
int
nwfs_sysctl_vnprint(SYSCTL_HANDLER_ARGS) {
struct nwnode *np;
struct nwnode_hash_head *nhpp;
struct vnode *vp;
int i;
if (nwfs_debuglevel == 0)
return 0;
printf("Name:uc:hc:fid:pfid\n");
for(i = 0; i <= nwnodehash; i++) {
nhpp = &nwhashtbl[i];
LIST_FOREACH(np, nhpp, n_hash) {
vp = NWTOV(np);
vprint("", vp);
printf("%s:%d:%d:%d:%d\n",np->n_name,vrefcnt(vp),
vp->v_holdcnt,np->n_fid.f_id, np->n_fid.f_parent);
}
}
return 0;
}
/*
* Search nwnode with given fid.
* Hash list should be locked by caller.
*/
static int
nwfs_hashlookup(struct nwmount *nmp, ncpfid fid, struct nwnode **npp)
{
struct nwnode *np;
struct nwnode_hash_head *nhpp;
nhpp = NWNOHASH(fid);
LIST_FOREACH(np, nhpp, n_hash) {
if (nmp != np->n_mount || !NWCMPF(&fid, &np->n_fid))
continue;
if (npp)
*npp = np;
return 0;
}
return ENOENT;
}
/*
* Allocate new nwfsnode/vnode from given nwnode.
* Vnode referenced and not locked.
*/
static int
nwfs_allocvp(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
struct vnode *dvp, struct vnode **vpp)
{
struct thread *td = curthread; /* XXX */
struct nwnode *np;
struct nwnode_hash_head *nhpp;
struct nwmount *nmp = VFSTONWFS(mp);
struct vnode *vp;
int error;
loop:
lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
rescan:
if (nwfs_hashlookup(nmp, fid, &np) == 0) {
vp = NWTOV(np);
mtx_lock(&vp->v_interlock);
lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td))
goto loop;
if (fap)
np->n_attr = fap->attributes;
*vpp = vp;
return(0);
}
lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
if (fap == NULL || ((fap->attributes & aDIR) == 0 && dvp == NULL))
panic("nwfs_allocvp: fap = %p, dvp = %p\n", fap, dvp);
/*
* Do the MALLOC before the getnewvnode since doing so afterward
* might cause a bogus v_data pointer to get dereferenced
* elsewhere if MALLOC should block.
*/
MALLOC(np, struct nwnode *, sizeof *np, M_NWNODE, M_WAITOK | M_ZERO);
error = getnewvnode("nwfs", mp, &nwfs_vnodeops, &vp);
if (error) {
*vpp = NULL;
FREE(np, M_NWNODE);
return (error);
}
vp->v_data = np;
np->n_vnode = vp;
np->n_mount = nmp;
np->n_attr = fap->attributes;
vp->v_type = np->n_attr & aDIR ? VDIR : VREG;
np->n_fid = fid;
if (dvp) {
np->n_parent = VTONW(dvp)->n_fid;
}
vp->v_vnlock->lk_flags |= LK_CANRECURSE;
lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
/*
* Another process can create vnode while we blocked in malloc() or
* getnewvnode(). Rescan list again.
*/
if (nwfs_hashlookup(nmp, fid, NULL) == 0) {
vp->v_data = NULL;
np->n_vnode = NULL;
vrele(vp);
FREE(np, M_NWNODE);
goto rescan;
}
*vpp = vp;
nhpp = NWNOHASH(fid);
LIST_INSERT_HEAD(nhpp, np, n_hash);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
ASSERT_VOP_LOCKED(dvp, "nwfs_allocvp");
if (vp->v_type == VDIR && dvp && (dvp->v_vflag & VV_ROOT) == 0) {
np->n_flag |= NREFPARENT;
vref(dvp);
}
return 0;
}
int
nwfs_nget(struct mount *mp, ncpfid fid, struct nw_entry_info *fap,
struct vnode *dvp, struct vnode **vpp)
{
struct vnode *vp;
int error;
*vpp = NULL;
error = nwfs_allocvp(mp, fid, fap, dvp, &vp);
if (error)
return error;
if (fap)
nwfs_attr_cacheenter(vp, fap);
*vpp = vp;
return 0;
}
int
nwfs_lookupnp(struct nwmount *nmp, ncpfid fid, struct thread *td,
struct nwnode **npp)
{
int error;
lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
error = nwfs_hashlookup(nmp, fid, npp);
lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
return error;
}
/*
* Free nwnode, and give vnode back to system
*/
int
nwfs_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
struct thread *a_td;
} */ *ap;
{
struct vnode *dvp = NULL, *vp = ap->a_vp;
struct nwnode *dnp, *np = VTONW(vp);
struct nwmount *nmp = VTONWFS(vp);
struct thread *td = ap->a_td;
NCPVNDEBUG("%s,%d\n", np->n_name, vrefcnt(vp));
/*
* Destroy the vm object and flush associated pages.
*/
vnode_destroy_vobject(vp);
if (np->n_flag & NREFPARENT) {
np->n_flag &= ~NREFPARENT;
if (nwfs_lookupnp(nmp, np->n_parent, td, &dnp) == 0) {
dvp = dnp->n_vnode;
} else {
NCPVNDEBUG("%s: has no parent ?\n",np->n_name);
}
}
lockmgr(&nwhashlock, LK_EXCLUSIVE, NULL, td);
LIST_REMOVE(np, n_hash);
lockmgr(&nwhashlock, LK_RELEASE, NULL, td);
if (nmp->n_root == np) {
nmp->n_root = NULL;
}
vp->v_data = NULL;
FREE(np, M_NWNODE);
if (dvp) {
vrele(dvp);
}
return (0);
}
int
nwfs_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
struct thread *a_td;
} */ *ap;
{
struct thread *td = ap->a_td;
struct ucred *cred = td->td_ucred;
struct vnode *vp = ap->a_vp;
struct nwnode *np = VTONW(vp);
int error;
NCPVNDEBUG("%s: %d\n", VTONW(vp)->n_name, vrefcnt(vp));
if (np->opened) {
error = nwfs_vinvalbuf(vp, td);
error = ncp_close_file(NWFSTOCONN(VTONWFS(vp)), &np->n_fh, td, cred);
np->opened = 0;
}
if (np->n_flag & NSHOULDFREE) {
cache_purge(vp);
vgone(vp);
}
return (0);
}
/*
* routines to maintain vnode attributes cache
* nwfs_attr_cacheenter: unpack np.i to va structure
*/
void
nwfs_attr_cacheenter(struct vnode *vp, struct nw_entry_info *fi)
{
struct nwnode *np = VTONW(vp);
struct nwmount *nmp = VTONWFS(vp);
struct vattr *va = &np->n_vattr;
va->va_type = vp->v_type; /* vnode type (for create) */
np->n_nmlen = fi->nameLen;
bcopy(fi->entryName, np->n_name, np->n_nmlen);
np->n_name[fi->nameLen] = 0;
if (vp->v_type == VREG) {
if (va->va_size != fi->dataStreamSize) {
va->va_size = fi->dataStreamSize;
vnode_pager_setsize(vp, va->va_size);
}
va->va_mode = nmp->m.file_mode; /* files access mode and type */
} else if (vp->v_type == VDIR) {
va->va_size = 16384; /* should be a better way ... */
va->va_mode = nmp->m.dir_mode; /* files access mode and type */
} else
return;
np->n_size = va->va_size;
va->va_nlink = 1; /* number of references to file */
va->va_uid = nmp->m.uid; /* owner user id */
va->va_gid = nmp->m.gid; /* owner group id */
va->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
va->va_fileid = np->n_fid.f_id; /* file id */
if (va->va_fileid == 0)
va->va_fileid = NWFS_ROOT_INO;
va->va_blocksize=nmp->connh->nh_conn->buffer_size;/* blocksize preferred for i/o */
/* time of last modification */
ncp_dos2unixtime(fi->modifyDate, fi->modifyTime, 0, nmp->m.tz, &va->va_mtime);
/* time of last access */
ncp_dos2unixtime(fi->lastAccessDate, 0, 0, nmp->m.tz, &va->va_atime);
va->va_ctime = va->va_mtime; /* time file changed */
va->va_gen = VNOVAL; /* generation number of file */
va->va_flags = 0; /* flags defined for file */
va->va_rdev = VNOVAL; /* device the special file represents */
va->va_bytes = va->va_size; /* bytes of disk space held by file */
va->va_filerev = 0; /* file modification number */
va->va_vaflags = 0; /* operations flags */
np->n_vattr = *va;
if (np->n_mtime == 0) {
np->n_mtime = va->va_mtime.tv_sec;
}
np->n_atime = time_second;
np->n_dosfid = fi->DosDirNum;
return;
}
int
nwfs_attr_cachelookup(struct vnode *vp, struct vattr *va)
{
struct nwnode *np = VTONW(vp);
int diff;
diff = time_second - np->n_atime;
if (diff > 2) { /* XXX should be configurable */
return ENOENT;
}
*va = np->n_vattr;
return 0;
}