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NetBSD/sys/nfs/nfs_vfsops.c
yamt 005c29fafb fix a page locking deadlock problem for nfs. 
add a flag that specify if the file can be truncated safely or not
to nfsm_loadattr and friends.  when it isn't safe, just mark the nfsnode
as "should be truncated later".

ok'ed by Frank van der Linden and Chuck Silvers.
close kern/18036.
2002-10-21 12:52:32 +00:00

1094 lines
26 KiB
C
Raw Blame History

/* $NetBSD: nfs_vfsops.c,v 1.119 2002/10/21 12:52:34 yamt 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.119 2002/10/21 12:52:34 yamt Exp $");
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#include "opt_nfs.h"
#endif
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/device.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/sysctl.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>
extern struct nfsstats nfsstats;
extern int nfs_ticks;
int nfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t,
struct proc *));
/*
* nfs vfs operations.
*/
extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = {
&nfsv2_vnodeop_opv_desc,
&spec_nfsv2nodeop_opv_desc,
&fifo_nfsv2nodeop_opv_desc,
NULL,
};
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_vfs_init,
nfs_vfs_reinit,
nfs_vfs_done,
nfs_sysctl,
nfs_mountroot,
nfs_checkexp,
nfs_vnodeopv_descs,
};
extern u_int32_t nfs_procids[NFS_NPROCS];
extern u_int32_t nfs_prog, nfs_vers;
static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *,
struct mount **, struct vnode **, struct proc *));
#define TRUE 1
#define FALSE 0
/*
* nfs statfs call
*/
int
nfs_statfs(mp, sbp, p)
struct mount *mp;
struct statfs *sbp;
struct proc *p;
{
struct vnode *vp;
struct nfs_statfs *sfp;
caddr_t cp;
u_int32_t *tl;
int32_t t1, t2;
caddr_t bpos, dpos, cp2;
struct nfsmount *nmp = VFSTONFS(mp);
int error = 0, retattr;
#ifdef NFS_V2_ONLY
const int v3 = 0;
#else
int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
#endif
struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2;
struct ucred *cred;
u_quad_t tquad;
#ifndef nolint
sfp = (struct nfs_statfs *)0;
#endif
vp = nmp->nm_vnode;
cred = crget();
cred->cr_ngroups = 0;
#ifndef NFS_V2_ONLY
if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
(void)nfs_fsinfo(nmp, vp, cred, p);
#endif
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, 0);
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;
tquad = fxdr_hyper(&sfp->sf_tbytes);
sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_fbytes);
sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_abytes);
sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_tfiles);
sbp->f_files = (long)tquad;
tquad = fxdr_hyper(&sfp->sf_ffiles);
sbp->f_ffree = (long)tquad;
} 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) {
memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN);
memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN);
}
strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
nfsm_reqdone;
crfree(cred);
return (error);
}
#ifndef NFS_V2_ONLY
/*
* nfs version 3 fsinfo rpc call
*/
int
nfs_fsinfo(nmp, vp, cred, p)
struct nfsmount *nmp;
struct vnode *vp;
struct ucred *cred;
struct proc *p;
{
struct nfsv3_fsinfo *fsp;
caddr_t cp;
int32_t t1, t2;
u_int32_t *tl, pref, max;
caddr_t bpos, dpos, cp2;
int error = 0, retattr;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
u_int64_t maxfsize;
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, 0);
if (!error) {
nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
if (max < nmp->nm_wsize && max > 0) {
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 && pref >= NFS_FABLKSIZE)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
if (max < nmp->nm_rsize && max > 0) {
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 && pref >= NFS_DIRFRAGSIZ)
nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
~(NFS_DIRFRAGSIZ - 1);
if (max < nmp->nm_readdirsize && max > 0) {
nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = max;
}
/* XXX */
nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
nmp->nm_maxfilesize = maxfsize;
nmp->nm_iflag |= NFSMNT_GOTFSINFO;
}
nfsm_reqdone;
return (error);
}
#endif
/*
* Mount a remote root fs via. NFS. It goes like this:
* - Call nfs_boot_init() to fill in the nfs_diskless struct
* - 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 */
if (root_device->dv_class != DV_IFNET)
return (ENODEV);
/*
* 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.
*/
nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK);
memset((caddr_t)nd, 0, sizeof(*nd));
error = nfs_boot_init(nd, procp);
if (error) {
free(nd, M_NFSMNT);
return (error);
}
/*
* Create the root mount point.
*/
error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp);
if (error)
goto out;
printf("root on %s\n", nd->nd_root.ndm_host);
/*
* Link it into the mount list.
*/
simple_lock(&mountlist_slock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
simple_unlock(&mountlist_slock);
rootvp = vp;
mp->mnt_vnodecovered = NULLVP;
vfs_unbusy(mp);
/* 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_atime.tv_sec;
#ifdef DEBUG
printf("root time: 0x%lx\n", n);
#endif
inittodr(n);
out:
if (error)
nfs_boot_cleanup(nd, procp);
free(nd, M_NFSMNT);
return (error);
}
/*
* Internal version of mount system call for diskless setup.
* Separate function because we used to call it twice.
* (once for root and once for swap)
*/
static int
nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p)
struct nfs_dlmount *ndmntp;
const char *mntname; /* mount point name */
struct mount **mpp;
struct vnode **vpp;
struct proc *p;
{
struct mount *mp;
struct mbuf *m;
int error;
vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp);
mp->mnt_op = &nfs_vfsops;
/*
* Historical practice expects NFS root file systems to
* be initially mounted r/w.
*/
mp->mnt_flag &= ~MNT_RDONLY;
/* Get mbuf for server sockaddr. */
m = m_get(M_WAIT, MT_SONAME);
if (m == NULL)
panic("nfs_mountroot: mget soname for %s", mntname);
memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr,
(m->m_len = ndmntp->ndm_args.addr->sa_len));
error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
ndmntp->ndm_args.hostname, vpp, p);
if (error) {
mp->mnt_op->vfs_refcount--;
vfs_unbusy(mp);
printf("nfs_mountroot: mount %s failed: %d\n",
mntname, error);
free(mp, M_MOUNT);
} else
*mpp = mp;
return (error);
}
void
nfs_decode_args(nmp, argp)
struct nfsmount *nmp;
struct nfs_args *argp;
{
int s;
int adjsock;
int maxio;
s = splsoftnet();
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context.
*/
if (argp->sotype == SOCK_STREAM)
argp->flags &= ~NFSMNT_NOCONN;
/*
* Cookie translation is not needed for v2, silently ignore it.
*/
if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
NFSMNT_XLATECOOKIE)
argp->flags &= ~NFSMNT_XLATECOOKIE;
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
/* Also re-bind if we're switching to/from a connected UDP socket */
adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
(argp->flags & NFSMNT_NOCONN));
/* Update flags. */
nmp->nm_flag = argp->flags;
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;
}
#ifndef NFS_V2_ONLY
if (argp->flags & NFSMNT_NFSV3) {
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
} else
#endif
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 minimum blocksize */
nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
/* Bigger than buffer size makes no sense */
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;
adjsock |= ((nmp->nm_sotype != argp->sotype) ||
(nmp->nm_soproto != argp->proto));
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
if (nmp->nm_so && adjsock) {
nfs_safedisconnect(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, "nfscn3", 0);
}
}
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* memcpy() 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;
const char *path;
void *data;
struct nameidata *ndp;
struct proc *p;
{
int error;
struct nfs_args args;
struct mbuf *nam;
struct nfsmount *nmp = VFSTONFS(mp);
struct sockaddr *sa;
struct vnode *vp;
char *pth, *hst;
size_t len;
u_char *nfh;
error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
if (error)
return (error);
if (mp->mnt_flag & MNT_GETARGS) {
if (nmp == NULL)
return (EIO);
if (args.addr != NULL) {
sa = mtod(nmp->nm_nam, struct sockaddr *);
error = copyout(sa, args.addr, sa->sa_len);
if (error)
return (error);
}
args.version = NFS_ARGSVERSION;
args.addrlen = sa->sa_len;
args.sotype = nmp->nm_sotype;
args.proto = nmp->nm_soproto;
args.fh = NULL;
args.fhsize = 0;
args.flags = nmp->nm_flag;
args.wsize = nmp->nm_wsize;
args.rsize = nmp->nm_rsize;
args.readdirsize = nmp->nm_readdirsize;
args.timeo = nmp->nm_timeo;
args.retrans = nmp->nm_retry;
args.maxgrouplist = nmp->nm_numgrps;
args.readahead = nmp->nm_readahead;
args.leaseterm = nmp->nm_leaseterm;
args.deadthresh = nmp->nm_deadthresh;
args.hostname = NULL;
return (copyout(&args, data, sizeof(args)));
}
if (args.version != NFS_ARGSVERSION)
return (EPROGMISMATCH);
#ifdef NFS_V2_ONLY
if (args.flags & NFSMNT_NQNFS)
return (EPROGUNAVAIL);
if (args.flags & NFSMNT_NFSV3)
return (EPROGMISMATCH);
#endif
if (mp->mnt_flag & MNT_UPDATE) {
if (nmp == NULL)
return (EIO);
/*
* When doing an update, we can't change from or to
* v3 and/or nqnfs, or change cookie translation
*/
args.flags = (args.flags &
~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) |
(nmp->nm_flag &
(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE));
nfs_decode_args(nmp, &args);
return (0);
}
if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX)
return (EINVAL);
MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK);
error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
if (error)
return (error);
MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK);
error = copyinstr(path, pth, MNAMELEN - 1, &len);
if (error)
goto free_nfh;
memset(&pth[len], 0, MNAMELEN - len);
MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK);
error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len);
if (error)
goto free_pth;
memset(&hst[len], 0, MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME);
if (error)
goto free_hst;
args.fh = nfh;
error = mountnfs(&args, mp, nam, pth, hst, &vp, p);
free_hst:
FREE(hst, M_TEMP);
free_pth:
FREE(pth, M_TEMP);
free_nfh:
FREE(nfh, M_TEMP);
return (error);
}
/*
* Common code for mount and mountroot
*/
int
mountnfs(argp, mp, nam, pth, hst, vpp, p)
struct nfs_args *argp;
struct mount *mp;
struct mbuf *nam;
const char *pth, *hst;
struct vnode **vpp;
struct proc *p;
{
struct nfsmount *nmp;
struct nfsnode *np;
int error;
struct vattr *attrs;
struct ucred *cr;
/*
* If the number of nfs iothreads to use has never
* been set, create a reasonable number of them.
*/
if (nfs_niothreads < 0) {
nfs_niothreads = NFS_DEFAULT_NIOTHREADS;
nfs_getset_niothreads(TRUE);
}
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);
memset((caddr_t)nmp, 0, sizeof (struct nfsmount));
mp->mnt_data = nmp;
TAILQ_INIT(&nmp->nm_uidlruhead);
TAILQ_INIT(&nmp->nm_bufq);
}
vfs_getnewfsid(mp);
nmp->nm_mountp = mp;
#ifndef NFS_V2_ONLY
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;
#endif
#ifndef NFS_V2_ONLY
if ((argp->flags & NFSMNT_NFSV3) == 0)
#endif
/*
* V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
* will fill this in.
*/
nmp->nm_maxfilesize = 0xffffffffLL;
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;
#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);
memcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN);
memcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN);
nmp->nm_nam = nam;
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
nfs_decode_args(nmp, argp);
mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
mp->mnt_dev_bshift = DEV_BSHIFT;
/*
* 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;
error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
if (error)
goto bad;
*vpp = NFSTOV(np);
MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK);
VOP_GETATTR(*vpp, attrs, p->p_ucred, p);
if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) {
cr = crget();
cr->cr_uid = attrs->va_uid;
cr->cr_gid = attrs->va_gid;
cr->cr_ngroups = 0;
nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr);
crfree(cr);
}
FREE(attrs, M_TEMP);
/*
* 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). So, just unlock, but no rele.
*/
nmp->nm_vnode = *vpp;
VOP_UNLOCK(*vpp, 0);
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;
{
struct nfsmount *nmp;
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!
*/
vp = nmp->nm_vnode;
error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0)
return error;
if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) {
vput(vp);
return (EBUSY);
}
/*
* Must handshake with nqnfs_clientd() if it is active.
*/
nmp->nm_iflag |= 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_iflag &= ~NFSMNT_DISMINPROG;
return (error);
}
/*
* We are now committed to the unmount; mark the mount structure
* as doomed so that any sleepers kicked awake by nfs_disconnect
* will go away cleanly.
*/
nmp->nm_iflag |= NFSMNT_DISMNT;
/*
* There are two reference counts to get rid of here
* (see comment in mountnfs()).
*/
vrele(vp);
vput(vp);
vgone(vp);
nfs_disconnect(nmp);
m_freem(nmp->nm_nam);
/*
* For NQNFS, let the server daemon free the nfsmount structure.
*/
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;
{
struct vnode *vp;
struct nfsmount *nmp;
int error;
nmp = VFSTONFS(mp);
vp = nmp->nm_vnode;
error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0)
return error;
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;
{
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 (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) ||
(LIST_EMPTY(&vp->v_dirtyblkhd) &&
vp->v_uobj.uo_npages == 0))
continue;
if (vget(vp, LK_EXCLUSIVE))
goto loop;
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, 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);
}
/*
* Do that sysctl thang...
*/
int
nfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
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;
case NFS_IOTHREADS:
nfs_getset_niothreads(0);
rv = (sysctl_int(oldp, oldlenp, newp, newlen,
&nfs_niothreads));
if (newp)
nfs_getset_niothreads(1);
return rv;
default:
return EOPNOTSUPP;
}
}
/*
* At this point, this should never happen
*/
/* ARGSUSED */
int
nfs_fhtovp(mp, fhp, vpp)
struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
return (EINVAL);
}
/* ARGSUSED */
int
nfs_checkexp(mp, nam, exflagsp, credanonp)
struct mount *mp;
struct mbuf *nam;
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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