758 lines
19 KiB
C
758 lines
19 KiB
C
/*
|
|
* Copyright (c) 1989, 1993
|
|
* 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 8.3 (Berkeley) 1/4/94
|
|
* $Id: nfs_vfsops.c,v 1.4 1994/09/21 03:47:22 wollman Exp $
|
|
*/
|
|
|
|
#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/nfsv2.h>
|
|
#include <nfs/nfsnode.h>
|
|
#include <nfs/nfsmount.h>
|
|
#include <nfs/nfs.h>
|
|
#include <nfs/xdr_subs.h>
|
|
#include <nfs/nfsm_subs.h>
|
|
#include <nfs/nfsdiskless.h>
|
|
#include <nfs/nqnfs.h>
|
|
|
|
/*
|
|
* nfs vfs operations.
|
|
*/
|
|
struct vfsops nfs_vfsops = {
|
|
nfs_mount,
|
|
nfs_start,
|
|
nfs_unmount,
|
|
nfs_root,
|
|
nfs_quotactl,
|
|
nfs_statfs,
|
|
nfs_sync,
|
|
nfs_vget,
|
|
nfs_fhtovp,
|
|
nfs_vptofh,
|
|
nfs_init,
|
|
};
|
|
VFS_SET(nfs_vfsops, nfs, MOUNT_NFS, 0);
|
|
|
|
/*
|
|
* This structure must be filled in by a primary bootstrap or bootstrap
|
|
* server for a diskless/dataless machine. It is initialized below just
|
|
* to ensure that it is allocated to initialized data (.data not .bss).
|
|
*/
|
|
struct nfs_diskless nfs_diskless = { 0 };
|
|
|
|
extern u_long nfs_procids[NFS_NPROCS];
|
|
extern u_long nfs_prog, nfs_vers;
|
|
void nfs_disconnect __P((struct nfsmount *));
|
|
void nfsargs_ntoh __P((struct nfs_args *));
|
|
static struct mount *nfs_mountdiskless __P((char *, char *, int,
|
|
struct sockaddr_in *, struct nfs_args *, register 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 nfsv2_statfs *sfp;
|
|
register caddr_t cp;
|
|
register long t1;
|
|
caddr_t bpos, dpos, cp2;
|
|
int error = 0, isnq;
|
|
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
|
|
struct nfsmount *nmp;
|
|
struct ucred *cred;
|
|
struct nfsnode *np;
|
|
|
|
nmp = VFSTONFS(mp);
|
|
isnq = (nmp->nm_flag & NFSMNT_NQNFS);
|
|
error = nfs_nget(mp, &nmp->nm_fh, &np);
|
|
if (error)
|
|
return (error);
|
|
vp = NFSTOV(np);
|
|
nfsstats.rpccnt[NFSPROC_STATFS]++;
|
|
cred = crget();
|
|
cred->cr_ngroups = 1;
|
|
nfsm_reqhead(vp, NFSPROC_STATFS, NFSX_FH);
|
|
nfsm_fhtom(vp);
|
|
nfsm_request(vp, NFSPROC_STATFS, p, cred);
|
|
nfsm_dissect(sfp, struct nfsv2_statfs *, NFSX_STATFS(isnq));
|
|
sbp->f_type = MOUNT_NFS;
|
|
sbp->f_flags = nmp->nm_flag;
|
|
sbp->f_iosize = NFS_MAXDGRAMDATA;
|
|
sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize);
|
|
sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks);
|
|
sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree);
|
|
sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail);
|
|
if (isnq) {
|
|
sbp->f_files = fxdr_unsigned(long, sfp->sf_files);
|
|
sbp->f_ffree = fxdr_unsigned(long, sfp->sf_ffree);
|
|
} else {
|
|
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);
|
|
}
|
|
nfsm_reqdone;
|
|
vrele(vp);
|
|
crfree(cred);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Mount a remote root fs via. nfs. This depends on the info in the
|
|
* nfs_diskless structure that has been filled in properly by some primary
|
|
* bootstrap.
|
|
* It goes something like this:
|
|
* - do enough of "ifconfig" by calling ifioctl() so that the system
|
|
* can talk to the server
|
|
* - If nfs_diskless.mygateway is filled in, use that address as
|
|
* a default gateway.
|
|
* - 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()
|
|
{
|
|
register struct mount *mp;
|
|
register struct nfs_diskless *nd = &nfs_diskless;
|
|
struct socket *so;
|
|
struct vnode *vp;
|
|
struct proc *p = curproc; /* XXX */
|
|
int error, i;
|
|
|
|
/*
|
|
* XXX time must be non-zero when we init the interface or else
|
|
* the arp code will wedge...
|
|
*/
|
|
if (time.tv_sec == 0)
|
|
time.tv_sec = 1;
|
|
|
|
#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
|
|
|
|
/*
|
|
* Do enough of ifconfig(8) so that the critical net interface can
|
|
* talk to the server.
|
|
*/
|
|
error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0);
|
|
if (error)
|
|
panic("nfs_mountroot: socreate: %d", error);
|
|
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p);
|
|
if (error)
|
|
panic("nfs_mountroot: SIOCAIFADDR: %d", error);
|
|
soclose(so);
|
|
|
|
/*
|
|
* If the gateway field is filled in, set it as the default route.
|
|
*/
|
|
if (nd->mygateway.sin_len != 0) {
|
|
struct sockaddr_in mask, sin;
|
|
|
|
bzero((caddr_t)&mask, sizeof(mask));
|
|
sin = mask;
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_len = sizeof(sin);
|
|
error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
|
|
(struct sockaddr *)&nd->mygateway,
|
|
(struct sockaddr *)&mask,
|
|
RTF_UP | RTF_GATEWAY, (struct rtentry **)0);
|
|
if (error)
|
|
panic("nfs_mountroot: RTM_ADD: %d", error);
|
|
}
|
|
|
|
/*
|
|
* If swapping to an nfs node (indicated by 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.
|
|
*/
|
|
if (swdevt[0].sw_dev == NODEV) {
|
|
nd->swap_args.fh = (nfsv2fh_t *)nd->swap_fh;
|
|
(void) nfs_mountdiskless(nd->swap_hostnam, "/swap", 0,
|
|
&nd->swap_saddr, &nd->swap_args, &vp);
|
|
|
|
/*
|
|
* 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;
|
|
swapdev_vp = vp;
|
|
VREF(vp);
|
|
swdevt[0].sw_vp = vp;
|
|
swdevt[0].sw_nblks = ntohl(nd->swap_nblks);
|
|
} else if (bdevvp(swapdev, &swapdev_vp))
|
|
panic("nfs_mountroot: can't setup swapdev_vp");
|
|
|
|
/*
|
|
* Create the rootfs mount point.
|
|
*/
|
|
nd->root_args.fh = (nfsv2fh_t *)nd->root_fh;
|
|
mp = nfs_mountdiskless(nd->root_hostnam, "/", MNT_RDONLY,
|
|
&nd->root_saddr, &nd->root_args, &vp);
|
|
|
|
if (vfs_lock(mp))
|
|
panic("nfs_mountroot: vfs_lock");
|
|
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
|
mp->mnt_flag |= MNT_ROOTFS;
|
|
mp->mnt_vnodecovered = NULLVP;
|
|
vfs_unlock(mp);
|
|
rootvp = vp;
|
|
|
|
/*
|
|
* This is not really an nfs issue, but it is much easier to
|
|
* set hostname here and then let the "/etc/rc.xxx" files
|
|
* mount the right /var based upon its preset value.
|
|
*/
|
|
bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
|
|
hostname[MAXHOSTNAMELEN - 1] = '\0';
|
|
for (i = 0; i < MAXHOSTNAMELEN; i++)
|
|
if (hostname[i] == '\0')
|
|
break;
|
|
hostnamelen = i;
|
|
inittodr(ntohl(nd->root_time));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Internal version of mount system call for diskless setup.
|
|
*/
|
|
static struct mount *
|
|
nfs_mountdiskless(path, which, mountflag, sin, args, vpp)
|
|
char *path;
|
|
char *which;
|
|
int mountflag;
|
|
struct sockaddr_in *sin;
|
|
struct nfs_args *args;
|
|
register struct vnode **vpp;
|
|
{
|
|
register struct mount *mp;
|
|
register struct mbuf *m;
|
|
register int error;
|
|
|
|
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
|
|
M_MOUNT, M_NOWAIT);
|
|
if (mp == NULL)
|
|
panic("nfs_mountroot: %s mount malloc", which);
|
|
bzero((char *)mp, (u_long)sizeof(struct mount));
|
|
mp->mnt_op = &nfs_vfsops;
|
|
mp->mnt_flag = mountflag;
|
|
|
|
MGET(m, MT_SONAME, M_DONTWAIT);
|
|
if (m == NULL)
|
|
panic("nfs_mountroot: %s mount mbuf", which);
|
|
bcopy((caddr_t)sin, mtod(m, caddr_t), sin->sin_len);
|
|
m->m_len = sin->sin_len;
|
|
nfsargs_ntoh(args);
|
|
error = mountnfs(args, mp, m, which, path, vpp);
|
|
if (error)
|
|
panic("nfs_mountroot: mount %s on %s: %d", path, which, error);
|
|
|
|
return (mp);
|
|
}
|
|
|
|
/*
|
|
* Convert the integer fields of the nfs_args structure from net byte order
|
|
* to host byte order. Called by nfs_mountroot() above.
|
|
*/
|
|
void
|
|
nfsargs_ntoh(nfsp)
|
|
register struct nfs_args *nfsp;
|
|
{
|
|
|
|
NTOHL(nfsp->sotype);
|
|
NTOHL(nfsp->proto);
|
|
NTOHL(nfsp->flags);
|
|
NTOHL(nfsp->wsize);
|
|
NTOHL(nfsp->rsize);
|
|
NTOHL(nfsp->timeo);
|
|
NTOHL(nfsp->retrans);
|
|
NTOHL(nfsp->maxgrouplist);
|
|
NTOHL(nfsp->readahead);
|
|
NTOHL(nfsp->leaseterm);
|
|
NTOHL(nfsp->deadthresh);
|
|
}
|
|
|
|
/*
|
|
* 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];
|
|
u_int len;
|
|
nfsv2fh_t nfh;
|
|
|
|
error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
|
|
if (error)
|
|
return (error);
|
|
error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t));
|
|
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;
|
|
|
|
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;
|
|
}
|
|
getnewfsid(mp, MOUNT_NFS);
|
|
nmp->nm_mountp = mp;
|
|
nmp->nm_flag = argp->flags;
|
|
if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_MYWRITE)) ==
|
|
(NFSMNT_NQNFS | NFSMNT_MYWRITE)) {
|
|
error = EPERM;
|
|
goto bad;
|
|
}
|
|
if (nmp->nm_flag & 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_numgrps = NFS_MAXGRPS;
|
|
nmp->nm_readahead = NFS_DEFRAHEAD;
|
|
nmp->nm_leaseterm = NQ_DEFLEASE;
|
|
nmp->nm_deadthresh = NQ_DEADTHRESH;
|
|
nmp->nm_tnext = (struct nfsnode *)nmp;
|
|
nmp->nm_tprev = (struct nfsnode *)nmp;
|
|
nmp->nm_inprog = NULLVP;
|
|
bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t));
|
|
mp->mnt_stat.f_type = MOUNT_NFS;
|
|
bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
|
|
bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
|
|
nmp->nm_nam = nam;
|
|
|
|
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_WSIZE) && argp->wsize > 0) {
|
|
nmp->nm_wsize = argp->wsize;
|
|
/* Round down to multiple of blocksize */
|
|
nmp->nm_wsize &= ~0x1ff;
|
|
if (nmp->nm_wsize <= 0)
|
|
nmp->nm_wsize = 512;
|
|
else if (nmp->nm_wsize > NFS_MAXDATA)
|
|
nmp->nm_wsize = NFS_MAXDATA;
|
|
}
|
|
if (nmp->nm_wsize > MAXBSIZE)
|
|
nmp->nm_wsize = MAXBSIZE;
|
|
|
|
if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
|
|
nmp->nm_rsize = argp->rsize;
|
|
/* Round down to multiple of blocksize */
|
|
nmp->nm_rsize &= ~0x1ff;
|
|
if (nmp->nm_rsize <= 0)
|
|
nmp->nm_rsize = 512;
|
|
else if (nmp->nm_rsize > NFS_MAXDATA)
|
|
nmp->nm_rsize = NFS_MAXDATA;
|
|
}
|
|
if (nmp->nm_rsize > MAXBSIZE)
|
|
nmp->nm_rsize = MAXBSIZE;
|
|
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;
|
|
/* 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, &nmp->nm_fh, &np);
|
|
if (error)
|
|
goto bad;
|
|
*vpp = NFSTOV(np);
|
|
|
|
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;
|
|
extern int doforce;
|
|
|
|
if (mntflags & MNT_FORCE) {
|
|
if (!doforce)
|
|
return (EINVAL);
|
|
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, &nmp->nm_fh, &np);
|
|
if (error)
|
|
return(error);
|
|
vp = NFSTOV(np);
|
|
if (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, &nmp->nm_fh, &np);
|
|
if (error)
|
|
return (error);
|
|
vp = NFSTOV(np);
|
|
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;
|
|
if (vget(vp, 1))
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|