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NetBSD/sys/nfs/nfs_vfsops.c

609 lines
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/*
* Copyright (c) 1989 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.
*
* from: @(#)nfs_vfsops.c 7.31 (Berkeley) 5/6/91
* $Id: nfs_vfsops.c,v 1.4 1993/07/13 10:04:29 cgd Exp $
*/
#include "param.h"
#include "conf.h"
#include "ioctl.h"
#include "signal.h"
#include "proc.h"
#include "namei.h"
#include "vnode.h"
#include "mount.h"
#include "buf.h"
#include "mbuf.h"
#include "socket.h"
#include "systm.h"
#include "../net/if.h"
#include "../net/route.h"
#include "../netinet/in.h"
#include "nfsv2.h"
#include "nfsnode.h"
#include "nfsmount.h"
#include "nfs.h"
#include "xdr_subs.h"
#include "nfsm_subs.h"
#include "nfsdiskless.h"
/*
* nfs vfs operations.
*/
struct vfsops nfs_vfsops = {
nfs_mount,
nfs_start,
nfs_unmount,
nfs_root,
nfs_quotactl,
nfs_statfs,
nfs_sync,
nfs_fhtovp,
nfs_vptofh,
nfs_init,
};
static u_char nfs_mntid;
extern u_long nfs_procids[NFS_NPROCS];
extern u_long nfs_prog, nfs_vers;
struct nfs_diskless nfs_diskless;
void nfs_disconnect();
#define TRUE 1
#define FALSE 0
/*
* nfs statfs call
*/
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;
u_long xid;
int error = 0;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
struct nfsmount *nmp;
struct ucred *cred;
struct nfsnode *np;
nmp = VFSTONFS(mp);
if (error = nfs_nget(mp, &nmp->nm_fh, &np))
return (error);
vp = NFSTOV(np);
nfsstats.rpccnt[NFSPROC_STATFS]++;
cred = crget();
cred->cr_ngroups = 1;
nfsm_reqhead(nfs_procids[NFSPROC_STATFS], cred, NFSX_FH);
nfsm_fhtom(vp);
nfsm_request(vp, NFSPROC_STATFS, p, 0);
nfsm_disect(sfp, struct nfsv2_statfs *, NFSX_STATFS);
sbp->f_type = MOUNT_NFS;
sbp->f_flags = nmp->nm_flag;
sbp->f_bsize = fxdr_unsigned(long, sfp->sf_tsize);
sbp->f_fsize = 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);
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;
nfs_nput(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.
* (This is done the 4.3 way with rtioctl() and should be changed)
* - hand craft the swap nfs vnode hanging off a fake mount point
* - build the rootfs mount point and call mountnfs() to do the rest.
*/
nfs_mountroot()
{
register struct mount *mp;
register struct mbuf *m;
struct socket *so;
struct vnode *vp;
int error;
/*
* Do enough of ifconfig(8) so that critical net interface can
* talk to the server.
*/
if (socreate(nfs_diskless.myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0))
panic("nfs ifconf");
if (ifioctl(so, SIOCAIFADDR, &nfs_diskless.myif))
panic("nfs ifconf2");
soclose(so);
/*
* If the gateway field is filled in, set it as the default route.
*/
#ifdef COMPAT_43
if (nfs_diskless.mygateway.sa_family == AF_INET) {
struct ortentry rt;
struct sockaddr_in *sin;
sin = (struct sockaddr_in *) &rt.rt_dst;
sin->sin_len = sizeof (struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = 0; /* default */
bcopy((caddr_t)&nfs_diskless.mygateway, (caddr_t)&rt.rt_gateway,
sizeof (struct sockaddr_in));
rt.rt_flags = (RTF_UP | RTF_GATEWAY);
if (rtioctl(SIOCADDRT, (caddr_t)&rt, curproc))
panic("nfs root route");
}
#endif /* COMPAT_43 */
/*
* 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) {
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
M_MOUNT, M_NOWAIT);
if (mp == NULL)
panic("nfs root mount");
mp->mnt_op = &nfs_vfsops;
mp->mnt_flag = 0;
mp->mnt_exroot = 0;
mp->mnt_mounth = NULLVP;
/*
* Set up the diskless nfs_args for the swap mount point
* and then call mountnfs() to mount it.
* Since the swap file is not the root dir of a file system,
* hack it to a regular file.
*/
nfs_diskless.swap_args.fh = (nfsv2fh_t *)nfs_diskless.swap_fh;
MGET(m, MT_SONAME, M_DONTWAIT);
if (m == NULL)
panic("nfs root mbuf");
bcopy((caddr_t)&nfs_diskless.swap_saddr, mtod(m, caddr_t),
nfs_diskless.swap_saddr.sa_len);
m->m_len = nfs_diskless.swap_saddr.sa_len;
if (mountnfs(&nfs_diskless.swap_args, mp, m, "/swap",
nfs_diskless.swap_hostnam, &vp))
panic("nfs swap");
vp->v_type = VREG;
vp->v_flag = 0;
swapdev_vp = vp;
VREF(vp);
swdevt[0].sw_vp = vp;
{
struct vattr attr;
if (nfs_dogetattr(vp,&attr,NOCRED,0,0)) {
panic("nfs swap");
}
swdevt[0].sw_nblks = attr.va_size / DEV_BSIZE;
}
}
/*
* Create the rootfs mount point.
*/
mp = (struct mount *)malloc((u_long)sizeof(struct mount),
M_MOUNT, M_NOWAIT);
if (mp == NULL)
panic("nfs root mount2");
mp->mnt_op = &nfs_vfsops;
mp->mnt_flag = MNT_RDONLY;
mp->mnt_exroot = 0;
mp->mnt_mounth = NULLVP;
/*
* Set up the root fs args and call mountnfs() to do the rest.
*/
nfs_diskless.root_args.fh = (nfsv2fh_t *)nfs_diskless.root_fh;
MGET(m, MT_SONAME, M_DONTWAIT);
if (m == NULL)
panic("nfs root mbuf2");
bcopy((caddr_t)&nfs_diskless.root_saddr, mtod(m, caddr_t),
nfs_diskless.root_saddr.sa_len);
m->m_len = nfs_diskless.root_saddr.sa_len;
if (mountnfs(&nfs_diskless.root_args, mp, m, "/",
nfs_diskless.root_hostnam, &vp))
panic("nfs root");
if (vfs_lock(mp))
panic("nfs root2");
rootfs = mp;
mp->mnt_next = mp;
mp->mnt_prev = mp;
mp->mnt_vnodecovered = NULLVP;
vfs_unlock(mp);
rootvp = vp;
inittodr((time_t)0); /* There is no time in the nfs fsstat so ?? */
return (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 */
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;
if (mp->mnt_flag & MNT_UPDATE)
return (0);
if (error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)))
return (error);
if (error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t)))
return (error);
if (error = copyinstr(path, pth, MNAMELEN-1, &len))
return (error);
bzero(&pth[len], MNAMELEN - len);
if (error = copyinstr(args.hostname, hst, MNAMELEN-1, &len))
return (error);
bzero(&hst[len], MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
if (error = sockargs(&nam, (caddr_t)args.addr,
sizeof (struct sockaddr), MT_SONAME))
return (error);
args.fh = &nfh;
error = mountnfs(&args, mp, nam, pth, hst, &vp);
return (error);
}
/*
* Common code for mount and mountroot
*/
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 proc *p = curproc; /* XXX */
struct nfsnode *np;
int error;
fsid_t tfsid;
MALLOC(nmp, struct nfsmount *, sizeof *nmp, M_NFSMNT, M_WAITOK);
bzero((caddr_t)nmp, sizeof *nmp);
mp->mnt_data = (qaddr_t)nmp;
/*
* Generate a unique nfs mount id. The problem is that a dev number
* is not unique across multiple systems. The techique is as follows:
* 1) Set to nblkdev,0 which will never be used otherwise
* 2) Generate a first guess as nblkdev,nfs_mntid where nfs_mntid is
* NOT 0
* 3) Loop searching the mount list for another one with same id
* If a match, increment val[0] and try again
* NB: I increment val[0] { a long } instead of nfs_mntid { a u_char }
* so that nfs is not limited to 255 mount points
* Incrementing the high order bits does no real harm, since it
* simply makes the major dev number tick up. The upper bound is
* set to major dev 127 to avoid any sign extention problems
*/
mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev, 0);
mp->mnt_stat.f_fsid.val[1] = MOUNT_NFS;
if (++nfs_mntid == 0)
++nfs_mntid;
tfsid.val[0] = makedev(nblkdev, nfs_mntid);
tfsid.val[1] = MOUNT_NFS;
while (rootfs && getvfs(&tfsid)) {
tfsid.val[0]++;
nfs_mntid++;
}
if (major(tfsid.val[0]) > 127) {
error = ENOENT;
goto bad;
}
mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
nmp->nm_mountp = mp;
nmp->nm_flag = argp->flags;
nmp->nm_rto = NFS_TIMEO;
nmp->nm_rtt = -1;
nmp->nm_rttvar = nmp->nm_rto << 1;
nmp->nm_retry = NFS_RETRANS;
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t));
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_rto = argp->timeo;
/* NFS timeouts are specified in 1/10 sec. */
nmp->nm_rto = (nmp->nm_rto * 10) / NFS_HZ;
if (nmp->nm_rto < NFS_MINTIMEO)
nmp->nm_rto = NFS_MINTIMEO;
else if (nmp->nm_rto > NFS_MAXTIMEO)
nmp->nm_rto = NFS_MAXTIMEO;
nmp->nm_rttvar = nmp->nm_rto << 1;
}
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;
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
if (error = nfs_connect(nmp))
goto bad;
if (error = nfs_statfs(mp, &mp->mnt_stat, p))
goto bad;
/*
* 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).
*/
if (error = nfs_nget(mp, &nmp->nm_fh, &np))
goto bad;
/*
* Unlock it, but keep the reference count.
*/
nfs_unlock(NFSTOV(np));
*vpp = NFSTOV(np);
return (0);
bad:
nfs_disconnect(nmp);
FREE(nmp, M_NFSMNT);
m_freem(nam);
return (error);
}
/*
* unmount system call
*/
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 || mp == rootfs)
return (EINVAL);
flags |= FORCECLOSE;
}
nmp = VFSTONFS(mp);
/*
* Clear out the buffer cache
*/
mntflushbuf(mp, 0);
if (mntinvalbuf(mp))
return (EBUSY);
/*
* 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!
*/
if (error = nfs_nget(mp, &nmp->nm_fh, &np))
return(error);
vp = NFSTOV(np);
if (vp->v_usecount > 2) {
vput(vp);
return (EBUSY);
}
if (error = vflush(mp, vp, flags)) {
vput(vp);
return (error);
}
/*
* Get rid of two reference counts, and unlock it on the second.
*/
vrele(vp);
vput(vp);
nfs_disconnect(nmp);
m_freem(nmp->nm_nam);
free((caddr_t)nmp, M_NFSMNT);
return (0);
}
/*
* Return root of a filesystem
*/
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);
if (error = nfs_nget(mp, &nmp->nm_fh, &np))
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 */
nfs_sync(mp, waitfor)
struct mount *mp;
int waitfor;
{
if (syncprt)
bufstats();
/*
* Force stale buffer cache information to be flushed.
*/
mntflushbuf(mp, waitfor == MNT_WAIT ? B_SYNC : 0);
return (0);
}
/*
* At this point, this should never happen
*/
/* ARGSUSED */
nfs_fhtovp(mp, fhp, vpp)
struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
return (EINVAL);
}
/*
* Vnode pointer to File handle, should never happen either
*/
/* ARGSUSED */
nfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
return (EINVAL);
}
/*
* Vfs start routine, a no-op.
*/
/* ARGSUSED */
nfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
}
/*
* Do operations associated with quotas, not supported
*/
nfs_quotactl(mp, cmd, uid, arg, p)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
#ifdef lint
mp = mp; cmd = cmd; uid = uid; arg = arg;
#endif /* lint */
return (EOPNOTSUPP);
}
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