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NetBSD/sys/nfs/nfs_vfsops.c
jmmv 2a3e5eeb7c Apply the NFS exports list rototill patch: 
- Remove all NFS related stuff from file system specific code.
- Drop the vfs_checkexp hook and generalize it in the new nfs_check_export
  function, thus removing redundancy from all file systems.
- Move all NFS export-related stuff from kern/vfs_subr.c to the new
  file sys/nfs/nfs_export.c.  The former was becoming large and its code
  is always compiled, regardless of the build options.  Using the latter,
  the code is only compiled in when NFSSERVER is enabled.  While doing this,
  also make some functions in nfs_subs.c conditional to NFSSERVER.
- Add a new command in nfssvc(2), called NFSSVC_SETEXPORTSLIST, that takes a
  path and a set of export entries.  At the moment it can only clear the
  exports list or append entries, one by one, but it is done in a way that
  allows setting the whole set of entries atomically in the future (see the
  comment in mountd_set_exports_list or in doc/TODO).
- Change mountd(8) to use the nfssvc(2) system call instead of mount(2) so
  that it becomes file system agnostic.  In fact, all this whole thing was
  done to remove a 'XXX' block from this utility!
- Change the mount*, newfs and fsck* userland utilities to not deal with NFS
  exports initialization; done internally by the kernel when initializing
  the NFS support for each file system.
- Implement an interface for VFS (called VFS hooks) so that several kernel
  subsystems can run arbitrary code upon receipt of specific VFS events.
  At the moment, this only provides support for unmount and is used to
  destroy NFS exports lists from the file systems being unmounted, though it
  has room for extension.

Thanks go to yamt@, chs@, thorpej@, wrstuden@ and others for their comments
and advice in the development of this patch.
2005-09-23 12:10:31 +00:00

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/* $NetBSD: nfs_vfsops.c,v 1.150 2005/09/23 12:10:33 jmmv 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. 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 1.150 2005/09/23 12:10:33 jmmv 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/dirent.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;
MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure");
/*
* 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_statvfs,
nfs_sync,
nfs_vget,
nfs_fhtovp,
nfs_vptofh,
nfs_vfs_init,
nfs_vfs_reinit,
nfs_vfs_done,
nfs_mountroot,
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
nfs_vnodeopv_descs,
};
VFS_ATTACH(nfs_vfsops);
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 *));
/*
* nfs statvfs call
*/
int
nfs_statvfs(mp, sbp, p)
struct mount *mp;
struct statvfs *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;
struct ucred *cred;
u_quad_t tquad;
struct nfsnode *np;
#ifndef nolint
sfp = (struct nfs_statfs *)0;
#endif
vp = nmp->nm_vnode;
np = VTONFS(vp);
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(np, NFSPROC_FSSTAT, NFSX_FH(v3));
nfsm_fhtom(np, v3);
nfsm_request(np, NFSPROC_FSSTAT, p, cred);
if (v3)
nfsm_postop_attr(vp, retattr, 0);
if (error) {
if (mrep != NULL) {
if (mrep->m_next != NULL)
printf("nfs_vfsops: nfs_statvfs would lose buffers\n");
m_freem(mrep);
}
goto nfsmout;
}
nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
sbp->f_flag = nmp->nm_flag;
sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
if (v3) {
sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tbytes);
sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_fbytes);
sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_abytes);
tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
sbp->f_bresvd = sbp->f_bfree - tquad;
sbp->f_bavail = tquad;
#ifdef COMPAT_20
/* Handle older NFS servers returning negative values */
if ((quad_t)sbp->f_bavail < 0)
sbp->f_bavail = 0;
#endif
tquad = fxdr_hyper(&sfp->sf_tfiles);
sbp->f_files = tquad;
tquad = fxdr_hyper(&sfp->sf_ffiles);
sbp->f_ffree = tquad;
sbp->f_favail = tquad;
sbp->f_fresvd = 0;
sbp->f_namemax = MAXNAMLEN;
} else {
sbp->f_bsize = NFS_FABLKSIZE;
sbp->f_frsize = 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_fresvd = 0;
sbp->f_files = 0;
sbp->f_ffree = 0;
sbp->f_favail = 0;
sbp->f_fresvd = 0;
sbp->f_namemax = MAXNAMLEN;
}
copy_statvfs_info(sbp, mp);
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, xmax;
caddr_t bpos, dpos, cp2;
int error = 0, retattr;
struct mbuf *mreq, *mrep, *md, *mb;
u_int64_t maxfsize;
struct nfsnode *np = VTONFS(vp);
nfsstats.rpccnt[NFSPROC_FSINFO]++;
nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
nfsm_fhtom(np, 1);
nfsm_request(np, 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 ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
if (xmax < nmp->nm_wsize && xmax > 0) {
nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = xmax;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
if (xmax < nmp->nm_rsize && xmax > 0) {
nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = xmax;
}
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 (xmax < nmp->nm_readdirsize && xmax > 0) {
nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = xmax;
}
/* 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_mountp->mnt_fs_bshift =
ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
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(nmp, 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
setrootfstime(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, 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);
MCLAIM(m, &nfs_mowner);
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, p)
struct nfsmount *nmp;
struct nfs_args *argp;
struct proc *p;
{
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, p)) {
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.addrlen = sa->sa_len;
} else
args.addrlen = 0;
args.version = NFS_ARGSVERSION;
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, p);
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;
MCLAIM(nam, &nfs_mowner);
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);
lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0);
simple_lock_init(&nmp->nm_slock);
}
vfs_getnewfsid(mp);
nmp->nm_mountp = mp;
#ifndef NFS_V2_ONLY
if (argp->flags & NFSMNT_NQNFS)
mp->mnt_iflag |= IMNT_DTYPE;
#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;
error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p);
if (error)
goto bad;
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, p);
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, p)))
goto bad;
/*
* This is silly, but it has to be set so that vinifod() works.
* We do not want to do an nfs_statvfs() 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:
LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
/*
* 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...
*/
static int
sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)
{
int error;
nfs_getset_niothreads(0);
error = sysctl_lookup(SYSCTLFN_CALL(rnode));
if (error || newp == NULL)
return (error);
nfs_getset_niothreads(1);
return (0);
}
SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "nfs",
SYSCTL_DESCR("NFS vfs options"),
NULL, 0, NULL, 0,
CTL_VFS, 2, CTL_EOL);
/*
* XXX the "2" above could be dynamic, thereby eliminating one
* more instance of the "number to vfs" mapping problem, but
* "2" is the order as taken from sys/mount.h
*/
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_STRUCT, "nfsstats",
SYSCTL_DESCR("NFS operation statistics"),
NULL, 0, &nfsstats, sizeof(nfsstats),
CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "iothreads",
SYSCTL_DESCR("Number of NFS client processes desired"),
sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0,
CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL);
}
/*
* 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);
}
/*
* 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;
void *arg;
struct proc *p;
{
return (EOPNOTSUPP);
}
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