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NetBSD/sys/nfs/nfs_vfsops.c
pk 6e8ba625ef Ignore the mountpoint's `v_usecount' in nfs_unmount() if MNT_FORCE is on. 
This takes care of two related problems:
	- `umount -f' wouldn't work if someone's working directory is
	  the filesystem root.
	- vfs_unmountall() would complain about a busy `/' on a
	  diskless setup.
1996-06-24 10:26:40 +00:00

993 lines
25 KiB
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/* $NetBSD: nfs_vfsops.c,v 1.49 1996/06/24 10:26:40 pk Exp $ */
/*
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfsnode.h>
#include <nfs/nfs.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/nqnfs.h>
#include <nfs/nfs_var.h>
struct nfsstats nfsstats;
extern int nfs_ticks;
#ifdef notyet
static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t,
struct proc *);
#endif
/*
* nfs vfs operations.
*/
struct vfsops nfs_vfsops = {
MOUNT_NFS,
nfs_mount,
nfs_start,
nfs_unmount,
nfs_root,
nfs_quotactl,
nfs_statfs,
nfs_sync,
nfs_vget,
nfs_fhtovp,
nfs_vptofh,
nfs_init,
#ifdef notyet
nfs_sysctl
#endif
};
extern u_int32_t nfs_procids[NFS_NPROCS];
extern u_int32_t nfs_prog, nfs_vers;
static struct mount *
nfs_mount_diskless __P((struct nfs_dlmount *, char *, int, struct vnode **));
#define TRUE 1
#define FALSE 0
/*
* nfs statfs call
*/
int
nfs_statfs(mp, sbp, p)
struct mount *mp;
register struct statfs *sbp;
struct proc *p;
{
register struct vnode *vp;
register struct nfs_statfs *sfp;
register caddr_t cp;
register u_int32_t *tl;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
struct nfsmount *nmp = VFSTONFS(mp);
int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2;
struct ucred *cred;
struct nfsnode *np;
u_quad_t tquad;
#ifndef nolint
sfp = (struct nfs_statfs *)0;
#endif
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
return (error);
vp = NFSTOV(np);
cred = crget();
cred->cr_ngroups = 0;
if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0)
(void)nfs_fsinfo(nmp, vp, cred, p);
nfsstats.rpccnt[NFSPROC_FSSTAT]++;
nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
nfsm_fhtom(vp, v3);
nfsm_request(vp, NFSPROC_FSSTAT, p, cred);
if (v3)
nfsm_postop_attr(vp, retattr);
if (error) {
if (mrep != NULL)
m_free(mrep);
goto nfsmout;
}
nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
#ifdef COMPAT_09
sbp->f_type = 2;
#else
sbp->f_type = 0;
#endif
sbp->f_flags = nmp->nm_flag;
sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
if (v3) {
sbp->f_bsize = NFS_FABLKSIZE;
fxdr_hyper(&sfp->sf_tbytes, &tquad);
sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
fxdr_hyper(&sfp->sf_fbytes, &tquad);
sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
fxdr_hyper(&sfp->sf_abytes, &tquad);
sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
sbp->f_files = (fxdr_unsigned(int32_t,
sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
sbp->f_ffree = (fxdr_unsigned(int32_t,
sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
} else {
sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
sbp->f_files = 0;
sbp->f_ffree = 0;
}
if (sbp != &mp->mnt_stat) {
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
nfsm_reqdone;
vrele(vp);
crfree(cred);
return (error);
}
/*
* nfs version 3 fsinfo rpc call
*/
int
nfs_fsinfo(nmp, vp, cred, p)
register struct nfsmount *nmp;
register struct vnode *vp;
struct ucred *cred;
struct proc *p;
{
register struct nfsv3_fsinfo *fsp;
register caddr_t cp;
register int32_t t1, t2;
register u_int32_t *tl, pref, max;
caddr_t bpos, dpos, cp2;
int error = 0, retattr;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
nfsstats.rpccnt[NFSPROC_FSINFO]++;
nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
nfsm_fhtom(vp, 1);
nfsm_request(vp, NFSPROC_FSINFO, p, cred);
nfsm_postop_attr(vp, retattr);
if (!error) {
nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
if (pref < nmp->nm_wsize)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
if (max < nmp->nm_wsize) {
nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = max;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
if (pref < nmp->nm_rsize)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
if (max < nmp->nm_rsize) {
nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = max;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
if (pref < nmp->nm_readdirsize)
nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
~(NFS_DIRBLKSIZ - 1);
if (max < nmp->nm_readdirsize) {
nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = max;
}
nmp->nm_flag |= NFSMNT_GOTFSINFO;
}
nfsm_reqdone;
return (error);
}
/*
* Mount a remote root fs via. NFS. It goes like this:
* - Call nfs_boot_init() to fill in the nfs_diskless struct
* (using RARP, bootparam RPC, mountd RPC)
* - hand craft the swap nfs vnode hanging off a fake mount point
* if swdevt[0].sw_dev == NODEV
* - build the rootfs mount point and call mountnfs() to do the rest.
*/
int
nfs_mountroot()
{
struct nfs_diskless nd;
struct vattr attr;
struct mount *mp;
struct vnode *vp;
struct proc *procp;
long n;
int error;
procp = curproc; /* XXX */
/*
* XXX time must be non-zero when we init the interface or else
* the arp code will wedge. [Fixed now in if_ether.c]
* However, the NFS attribute cache gives false "hits" when
* time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now.
*/
if (time.tv_sec < NFS_MAXATTRTIMO)
time.tv_sec = NFS_MAXATTRTIMO;
/*
* Call nfs_boot_init() to fill in the nfs_diskless struct.
* Side effect: Finds and configures a network interface.
*/
bzero((caddr_t) &nd, sizeof(nd));
nfs_boot_init(&nd, procp);
/*
* Create the root mount point.
*/
nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root);
mp = nfs_mount_diskless(&nd.nd_root, "/", 0, &vp);
printf("root on %s\n", nd.nd_root.ndm_host);
/*
* Link it into the mount list.
*/
#ifdef Lite2_integrated
simple_lock(&mountlist_slock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
simple_unlock(&mountlist_slock);
rootvp = vp;
vfs_unbusy(mp, procp);
#else
if (vfs_lock(mp))
panic("nfs_mountroot: vfs_lock");
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
mp->mnt_vnodecovered = NULLVP;
vfs_unlock(mp);
rootvp = vp;
#endif
/* Get root attributes (for the time). */
error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp);
if (error) panic("nfs_mountroot: getattr for root");
n = attr.va_mtime.tv_sec;
#ifdef DEBUG
printf("root time: 0x%lx\n", n);
#endif
inittodr(n);
/*
* XXX splnet, so networks will receive...
*/
splnet();
#ifdef notyet
/* Set up swap credentials. */
proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid);
proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid);
if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) >
NGROUPS)
proc0.p_ucred->cr_ngroups = NGROUPS;
for (i = 0; i < proc0.p_ucred->cr_ngroups; i++)
proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]);
#endif
/*
* "Mount" the swap device.
*
* On a "dataless" configuration (swap on disk) we will have:
* (swdevt[0].sw_dev != NODEV) identifying the swap device.
*/
if (bdevvp(swapdev, &swapdev_vp))
panic("nfs_mountroot: can't setup swap vp");
if (swdevt[0].sw_dev != NODEV) {
printf("swap on device 0x%x\n", swdevt[0].sw_dev);
return (0);
}
/*
* If swapping to an nfs node: (swdevt[0].sw_dev == NODEV)
* Create a fake mount point just for the swap vnode so that the
* swap file can be on a different server from the rootfs.
*/
nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap);
mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp);
#ifdef Lite2_integrated
vfs_unbusy(mp, procp);
#endif
printf("swap on %s\n", nd.nd_swap.ndm_host);
/*
* Since the swap file is not the root dir of a file system,
* hack it to a regular file.
*/
vp->v_type = VREG;
vp->v_flag = 0;
swdevt[0].sw_vp = vp;
/*
* Find out how large the swap file is.
*/
error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp);
if (error)
panic("nfs_mountroot: getattr for swap");
n = (long) (attr.va_size >> DEV_BSHIFT);
#ifdef DEBUG
printf("swap size: 0x%lx (blocks)\n", n);
#endif
swdevt[0].sw_nblks = n;
return (0);
}
/*
* Internal version of mount system call for diskless setup.
*/
static struct mount *
nfs_mount_diskless(ndmntp, mntname, mntflag, vpp)
struct nfs_dlmount *ndmntp;
char *mntname;
int mntflag;
struct vnode **vpp;
{
struct nfs_args args;
struct mount *mp;
struct mbuf *m;
int error;
#ifdef Lite2_integrated
vfs_rootmountalloc("nfs", mntname, &mp);
#else
/* Create the mount point. */
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
M_MOUNT, M_WAITOK);
if (mp == NULL)
panic("nfs_mountroot: malloc mount for %s", mntname);
bzero((char *)mp, (u_long)sizeof(struct mount));
#endif
mp->mnt_op = &nfs_vfsops;
mp->mnt_flag = mntflag;
/* Initialize mount args. */
bzero((caddr_t) &args, sizeof(args));
args.addr = (struct sockaddr *)&ndmntp->ndm_saddr;
args.addrlen = args.addr->sa_len;
args.sotype = SOCK_DGRAM;
args.fh = ndmntp->ndm_fh;
args.fhsize = NFSX_V2FH;
args.hostname = ndmntp->ndm_host;
args.flags = NFSMNT_RESVPORT;
#ifdef NFS_BOOT_OPTIONS
args.flags |= NFS_BOOT_OPTIONS;
#endif
#ifdef NFS_BOOT_RWSIZE
/*
* Reduce rsize,wsize for interfaces that consistently
* drop fragments of long UDP messages. (i.e. wd8003).
* You can always change these later via remount.
*/
args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE;
args.wsize = NFS_BOOT_RWSIZE;
args.rsize = NFS_BOOT_RWSIZE;
#endif
/* Get mbuf for server sockaddr. */
m = m_get(M_WAIT, MT_SONAME);
bcopy((caddr_t)args.addr, mtod(m, caddr_t),
(m->m_len = args.addr->sa_len));
error = mountnfs(&args, mp, m, mntname, args.hostname, vpp);
if (error)
panic("nfs_mountroot: mount %s failed: %d", mntname, error);
return (mp);
}
void
nfs_decode_args(nmp, argp)
struct nfsmount *nmp;
struct nfs_args *argp;
{
int s;
int adjsock;
int maxio;
s = splsoftnet();
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
/* Update flags atomically. Don't change the lock bits. */
nmp->nm_flag =
(argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL);
splx(s);
if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
if (nmp->nm_timeo < NFS_MINTIMEO)
nmp->nm_timeo = NFS_MINTIMEO;
else if (nmp->nm_timeo > NFS_MAXTIMEO)
nmp->nm_timeo = NFS_MAXTIMEO;
}
if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
nmp->nm_retry = argp->retrans;
if (nmp->nm_retry > NFS_MAXREXMIT)
nmp->nm_retry = NFS_MAXREXMIT;
}
if (argp->flags & NFSMNT_NFSV3) {
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
} else
maxio = NFS_V2MAXDATA;
if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
int osize = nmp->nm_wsize;
nmp->nm_wsize = argp->wsize;
/* Round down to multiple of blocksize */
nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize <= 0)
nmp->nm_wsize = NFS_FABLKSIZE;
adjsock |= (nmp->nm_wsize != osize);
}
if (nmp->nm_wsize > maxio)
nmp->nm_wsize = maxio;
if (nmp->nm_wsize > MAXBSIZE)
nmp->nm_wsize = MAXBSIZE;
if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
int osize = nmp->nm_rsize;
nmp->nm_rsize = argp->rsize;
/* Round down to multiple of blocksize */
nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize <= 0)
nmp->nm_rsize = NFS_FABLKSIZE;
adjsock |= (nmp->nm_rsize != osize);
}
if (nmp->nm_rsize > maxio)
nmp->nm_rsize = maxio;
if (nmp->nm_rsize > MAXBSIZE)
nmp->nm_rsize = MAXBSIZE;
if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
nmp->nm_readdirsize = argp->readdirsize;
/* Round down to multiple of blocksize */
nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1);
if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
nmp->nm_readdirsize = NFS_DIRBLKSIZ;
} else if (argp->flags & NFSMNT_RSIZE)
nmp->nm_readdirsize = nmp->nm_rsize;
if (nmp->nm_readdirsize > maxio)
nmp->nm_readdirsize = maxio;
if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
argp->maxgrouplist <= NFS_MAXGRPS)
nmp->nm_numgrps = argp->maxgrouplist;
if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
argp->readahead <= NFS_MAXRAHEAD)
nmp->nm_readahead = argp->readahead;
if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 &&
argp->leaseterm <= NQ_MAXLEASE)
nmp->nm_leaseterm = argp->leaseterm;
if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
argp->deadthresh <= NQ_NEVERDEAD)
nmp->nm_deadthresh = argp->deadthresh;
if (nmp->nm_so && adjsock) {
nfs_disconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp, (struct nfsreq *)0)) {
printf("nfs_args: retrying connect\n");
(void) tsleep((caddr_t)&lbolt,
PSOCK, "nfscon", 0);
}
}
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* bcopy() them in mountnfs(), but I wanted to detect errors before
* doing the sockargs() call because sockargs() allocates an mbuf and
* an error after that means that I have to release the mbuf.
*/
/* ARGSUSED */
int
nfs_mount(mp, path, data, ndp, p)
struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
int error;
struct nfs_args args;
struct mbuf *nam;
struct vnode *vp;
char pth[MNAMELEN], hst[MNAMELEN];
size_t len;
u_char nfh[NFSX_V3FHMAX];
error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
if (error)
return (error);
if (args.version != NFS_ARGSVERSION)
return (EPROGMISMATCH);
if (mp->mnt_flag & MNT_UPDATE) {
register struct nfsmount *nmp = VFSTONFS(mp);
if (nmp == NULL)
return (EIO);
/*
* When doing an update, we can't change from or to
* v3 and/or nqnfs.
*/
args.flags = (args.flags & ~(NFSMNT_NFSV3|NFSMNT_NQNFS)) |
(nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_NQNFS));
nfs_decode_args(nmp, &args);
return (0);
}
error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
if (error)
return (error);
error = copyinstr(path, pth, MNAMELEN-1, &len);
if (error)
return (error);
bzero(&pth[len], MNAMELEN - len);
error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
if (error)
return (error);
bzero(&hst[len], MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME);
if (error)
return (error);
args.fh = nfh;
error = mountnfs(&args, mp, nam, pth, hst, &vp);
return (error);
}
/*
* Common code for mount and mountroot
*/
int
mountnfs(argp, mp, nam, pth, hst, vpp)
register struct nfs_args *argp;
register struct mount *mp;
struct mbuf *nam;
char *pth, *hst;
struct vnode **vpp;
{
register struct nfsmount *nmp;
struct nfsnode *np;
int error;
struct vattr attrs;
if (mp->mnt_flag & MNT_UPDATE) {
nmp = VFSTONFS(mp);
/* update paths, file handles, etc, here XXX */
m_freem(nam);
return (0);
} else {
MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount),
M_NFSMNT, M_WAITOK);
bzero((caddr_t)nmp, sizeof (struct nfsmount));
mp->mnt_data = (qaddr_t)nmp;
TAILQ_INIT(&nmp->nm_uidlruhead);
}
#ifdef Lite2_integrated
vfs_getnewfsid(mp, makefstype(MOUNT_NFS));
#else
getnewfsid(mp, makefstype(MOUNT_NFS));
#endif
nmp->nm_mountp = mp;
if (argp->flags & NFSMNT_NQNFS)
/*
* We have to set mnt_maxsymlink to a non-zero value so
* that COMPAT_43 routines will know that we are setting
* the d_type field in directories (and can zero it for
* unsuspecting binaries).
*/
mp->mnt_maxsymlinklen = 1;
nmp->nm_timeo = NFS_TIMEO;
nmp->nm_retry = NFS_RETRANS;
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
nmp->nm_readdirsize = NFS_READDIRSIZE;
nmp->nm_numgrps = NFS_MAXGRPS;
nmp->nm_readahead = NFS_DEFRAHEAD;
nmp->nm_leaseterm = NQ_DEFLEASE;
nmp->nm_deadthresh = NQ_DEADTHRESH;
CIRCLEQ_INIT(&nmp->nm_timerhead);
nmp->nm_inprog = NULLVP;
nmp->nm_fhsize = argp->fhsize;
bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
#ifdef COMPAT_09
mp->mnt_stat.f_type = 2;
#else
mp->mnt_stat.f_type = 0;
#endif
strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
nmp->nm_nam = nam;
nfs_decode_args(nmp, argp);
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
/*
* For Connection based sockets (TCP,...) defer the connect until
* the first request, in case the server is not responding.
*/
if (nmp->nm_sotype == SOCK_DGRAM &&
(error = nfs_connect(nmp, (struct nfsreq *)0)))
goto bad;
/*
* This is silly, but it has to be set so that vinifod() works.
* We do not want to do an nfs_statfs() here since we can get
* stuck on a dead server and we are holding a lock on the mount
* point.
*/
mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
/*
* A reference count is needed on the nfsnode representing the
* remote root. If this object is not persistent, then backward
* traversals of the mount point (i.e. "..") will not work if
* the nfsnode gets flushed out of the cache. Ufs does not have
* this problem, because one can identify root inodes by their
* number == ROOTINO (2).
*/
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
goto bad;
*vpp = NFSTOV(np);
VOP_GETATTR(*vpp, &attrs, curproc->p_ucred, curproc); /* XXX */
return (0);
bad:
nfs_disconnect(nmp);
free((caddr_t)nmp, M_NFSMNT);
m_freem(nam);
return (error);
}
/*
* unmount system call
*/
int
nfs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
register struct nfsmount *nmp;
struct nfsnode *np;
struct vnode *vp;
int error, flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
nmp = VFSTONFS(mp);
/*
* Goes something like this..
* - Check for activity on the root vnode (other than ourselves).
* - Call vflush() to clear out vnodes for this file system,
* except for the root vnode.
* - Decrement reference on the vnode representing remote root.
* - Close the socket
* - Free up the data structures
*/
/*
* We need to decrement the ref. count on the nfsnode representing
* the remote root. See comment in mountnfs(). The VFS unmount()
* has done vput on this vnode, otherwise we would get deadlock!
*/
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
return(error);
vp = NFSTOV(np);
if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) {
vput(vp);
return (EBUSY);
}
/*
* Must handshake with nqnfs_clientd() if it is active.
*/
nmp->nm_flag |= NFSMNT_DISMINPROG;
while (nmp->nm_inprog != NULLVP)
(void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0);
error = vflush(mp, vp, flags);
if (error) {
vput(vp);
nmp->nm_flag &= ~NFSMNT_DISMINPROG;
return (error);
}
/*
* We are now committed to the unmount.
* For NQNFS, let the server daemon free the nfsmount structure.
*/
if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB))
nmp->nm_flag |= NFSMNT_DISMNT;
/*
* There are two reference counts to get rid of here.
*/
vrele(vp);
vrele(vp);
vgone(vp);
nfs_disconnect(nmp);
m_freem(nmp->nm_nam);
if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0)
free((caddr_t)nmp, M_NFSMNT);
return (0);
}
/*
* Return root of a filesystem
*/
int
nfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
register struct vnode *vp;
struct nfsmount *nmp;
struct nfsnode *np;
int error;
nmp = VFSTONFS(mp);
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
return (error);
vp = NFSTOV(np);
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_flag = VROOT;
*vpp = vp;
return (0);
}
extern int syncprt;
/*
* Flush out the buffer cache
*/
/* ARGSUSED */
int
nfs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
register struct vnode *vp;
int error, allerror = 0;
/*
* Force stale buffer cache information to be flushed.
*/
loop:
for (vp = mp->mnt_vnodelist.lh_first;
vp != NULL;
vp = vp->v_mntvnodes.le_next) {
/*
* If the vnode that we are about to sync is no longer
* associated with this mount point, start over.
*/
if (vp->v_mount != mp)
goto loop;
if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL)
continue;
#ifdef Lite2_integrated
if (vget(vp, LK_EXCLUSIVE, p))
#else
if (vget(vp, 1))
#endif
goto loop;
error = VOP_FSYNC(vp, cred, waitfor, p);
if (error)
allerror = error;
vput(vp);
}
return (allerror);
}
/*
* NFS flat namespace lookup.
* Currently unsupported.
*/
/* ARGSUSED */
int
nfs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
#ifdef notyet
/*
* Do that sysctl thang...
*/
static int
nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
size_t newlen, struct proc *p)
{
int rv;
/*
* All names at this level are terminal.
*/
if(namelen > 1)
return ENOTDIR; /* overloaded */
switch(name[0]) {
case NFS_NFSSTATS:
if(!oldp) {
*oldlenp = sizeof nfsstats;
return 0;
}
if(*oldlenp < sizeof nfsstats) {
*oldlenp = sizeof nfsstats;
return ENOMEM;
}
rv = copyout(&nfsstats, oldp, sizeof nfsstats);
if(rv) return rv;
if(newp && newlen != sizeof nfsstats)
return EINVAL;
if(newp) {
return copyin(newp, &nfsstats, sizeof nfsstats);
}
return 0;
default:
return EOPNOTSUPP;
}
}
#endif
/*
* At this point, this should never happen
*/
/* ARGSUSED */
int
nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
register struct mount *mp;
struct fid *fhp;
struct mbuf *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred **credanonp;
{
return (EINVAL);
}
/*
* Vnode pointer to File handle, should never happen either
*/
/* ARGSUSED */
int
nfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
return (EINVAL);
}
/*
* Vfs start routine, a no-op.
*/
/* ARGSUSED */
int
nfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
}
/*
* Do operations associated with quotas, not supported
*/
/* ARGSUSED */
int
nfs_quotactl(mp, cmd, uid, arg, p)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return (EOPNOTSUPP);
}
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