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src/sys/nfs/nfs_vfsops.c

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/* $OpenBSD: nfs_vfsops.c,v 1.131 2024/05/12 09:09:39 jsg Exp $ */
/* $NetBSD: nfs_vfsops.c,v 1.46.4.1 1996/05/25 22:40:35 fvdl 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/param.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/swap.h>
#include <sys/mbuf.h>
#include <sys/dirent.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <nfs/nfsproto.h>
#include <nfs/nfsnode.h>
#include <nfs/nfs.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/nfs_var.h>
#include <nfs/nfsm_subs.h>
extern struct nfsstats nfsstats;
extern int nfs_ticks;
int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t,
struct proc *);
int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **);
struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int,
struct vnode **, struct proc *p);
int mountnfs(struct nfs_args *, struct mount *, struct mbuf *,
const char *, char *, struct vnode **, struct proc *p);
int nfs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *);
int nfs_root(struct mount *, struct vnode **);
int nfs_start(struct mount *, int, struct proc *);
int nfs_statfs(struct mount *, struct statfs *, struct proc *);
int nfs_sync(struct mount *, int, int, struct ucred *, struct proc *);
int nfs_unmount(struct mount *, int, struct proc *);
void nfs_reaper(void *);
int nfs_vget(struct mount *, ino_t, struct vnode **);
int nfs_vptofh(struct vnode *, struct fid *);
int nfs_mountroot(void);
void nfs_decode_args(struct nfsmount *, struct nfs_args *,
struct nfs_args *);
int nfs_fhtovp(struct mount *, struct fid *, struct vnode **);
/*
* nfs vfs operations.
*/
const struct vfsops nfs_vfsops = {
.vfs_mount = nfs_mount,
.vfs_start = nfs_start,
.vfs_unmount = nfs_unmount,
.vfs_root = nfs_root,
.vfs_quotactl = nfs_quotactl,
.vfs_statfs = nfs_statfs,
.vfs_sync = nfs_sync,
.vfs_vget = nfs_vget,
.vfs_fhtovp = nfs_fhtovp,
.vfs_vptofh = nfs_vptofh,
.vfs_init = nfs_vfs_init,
.vfs_sysctl = nfs_sysctl,
.vfs_checkexp = nfs_checkexp,
};
/*
* nfs statfs call
*/
int
nfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
{
struct vnode *vp;
struct nfs_statfs *sfp = NULL;
struct nfsm_info info;
struct nfsmount *nmp = VFSTONFS(mp);
int error = 0, retattr;
struct ucred *cred;
u_quad_t tquad;
info.nmi_v3 = (nmp->nm_flag & NFSMNT_NFSV3);
info.nmi_errorp = &error;
error = nfs_root(mp, &vp);
if (error)
return (error);
cred = crget();
cred->cr_ngroups = 0;
if (info.nmi_v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0)
(void)nfs_fsinfo(nmp, vp, cred, p);
nfsstats.rpccnt[NFSPROC_FSSTAT]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3));
nfsm_fhtom(&info, vp, info.nmi_v3);
info.nmi_procp = p;
info.nmi_cred = cred;
error = nfs_request(vp, NFSPROC_FSSTAT, &info);
if (info.nmi_v3) {
if (nfsm_postop_attr(&info, &vp, &retattr) != 0)
goto nfsmout;
}
if (error) {
m_freem(info.nmi_mrep);
goto nfsmout;
}
sfp = (struct nfs_statfs *)
nfsm_dissect(&info, NFSX_STATFS(info.nmi_v3));
if (sfp == NULL)
goto nfsmout;
sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
if (info.nmi_v3) {
sbp->f_bsize = NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tbytes);
sbp->f_blocks = tquad / (u_quad_t)NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_fbytes);
sbp->f_bfree = tquad / (u_quad_t)NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_abytes);
sbp->f_bavail = (quad_t)tquad / (quad_t)NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tfiles);
sbp->f_files = tquad;
tquad = fxdr_hyper(&sfp->sf_ffiles);
sbp->f_ffree = tquad;
sbp->f_favail = 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;
sbp->f_favail = 0;
}
copy_statfs_info(sbp, mp);
m_freem(info.nmi_mrep);
nfsmout:
vput(vp);
crfree(cred);
return (error);
}
/*
* nfs version 3 fsinfo rpc call
*/
int
nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
struct proc *p)
{
struct nfsv3_fsinfo *fsp;
struct nfsm_info info;
u_int32_t pref, max;
int error = 0, retattr;
nfsstats.rpccnt[NFSPROC_FSINFO]++;
info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1));
nfsm_fhtom(&info, vp, 1);
info.nmi_procp = p;
info.nmi_cred = cred;
info.nmi_errorp = &error;
error = nfs_request(vp, NFSPROC_FSINFO, &info);
if (nfsm_postop_attr(&info, &vp, &retattr) != 0)
goto nfsmout;
if (error) {
m_freem(info.nmi_mrep);
goto nfsmout;
}
fsp = (struct nfsv3_fsinfo *)nfsm_dissect(&info, NFSX_V3FSINFO);
if (fsp == NULL)
goto nfsmout;
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;
m_freem(info.nmi_mrep);
nfsmout:
return (error);
}
struct nfs_diskless nfs_diskless;
/*
* 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(void)
{
struct vattr attr;
struct mount *mp;
struct vnode *vp;
struct proc *procp;
long n;
int error;
procp = curproc; /* XXX */
/*
* Call nfs_boot_init() to fill in the nfs_diskless struct.
* Side effect: Finds and configures a network interface.
*/
nfs_boot_init(&nfs_diskless, procp);
/*
* Create the root mount point.
*/
if (nfs_boot_getfh(&nfs_diskless.nd_boot, "root", &nfs_diskless.nd_root, -1))
panic("nfs_mountroot: root");
mp = nfs_mount_diskless(&nfs_diskless.nd_root, "/", 0, &vp, procp);
printf("root on %s\n", nfs_diskless.nd_root.ndm_host);
/*
* Link it into the mount list.
*/
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
rootvp = vp;
vfs_unbusy(mp);
/* Get root attributes (for the time). */
error = VOP_GETATTR(rootvp, &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);
#ifdef notyet
/* Set up swap credentials. */
proc0.p_ucred->cr_uid = ntohl(nfs_diskless.swap_ucred.cr_uid);
proc0.p_ucred->cr_gid = ntohl(nfs_diskless.swap_ucred.cr_gid);
if ((proc0.p_ucred->cr_ngroups = ntohs(nfs_diskless.swap_ucred.cr_ngroups)) >
NGROUPS_MAX)
proc0.p_ucred->cr_ngroups = NGROUPS_MAX;
for (i = 0; i < proc0.p_ucred->cr_ngroups; i++)
proc0.p_ucred->cr_groups[i] = ntohl(nfs_diskless.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 (swdevt[0].sw_dev != NODEV) {
if (bdevvp(swapdev, &swapdev_vp))
panic("nfs_mountroot: can't setup swap vp");
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.
*
* Wait 5 retries, finally no swap is cool. -mickey
*/
error = nfs_boot_getfh(&nfs_diskless.nd_boot, "swap", &nfs_diskless.nd_swap, 5);
if (!error) {
mp = nfs_mount_diskless(&nfs_diskless.nd_swap, "/swap", 0, &vp,
procp);
vfs_unbusy(mp);
/*
* 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;
/*
* Next line is a hack to make swapmount() work on NFS
* swap files.
*/
swdevt[0].sw_dev = NETDEV;
/* end hack */
nfs_diskless.sw_vp = vp;
/*
* Find out how large the swap file is.
*/
error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp);
if (error)
printf("nfs_mountroot: getattr for swap\n");
n = (long) (attr.va_size >> DEV_BSHIFT);
printf("swap on %s\n", nfs_diskless.nd_swap.ndm_host);
#ifdef DEBUG
printf("swap size: 0x%lx (blocks)\n", n);
#endif
return (0);
}
printf("WARNING: no swap\n");
swdevt[0].sw_dev = NODEV;
return (0);
}
/*
* Internal version of mount system call for diskless setup.
*/
struct mount *
nfs_mount_diskless(struct nfs_dlmount *ndmntp, char *mntname, int mntflag,
struct vnode **vpp, struct proc *p)
{
struct mount *mp;
struct mbuf *m;
int error;
if (vfs_rootmountalloc("nfs", mntname, &mp))
panic("nfs_mount_diskless: vfs_rootmountalloc failed");
mp->mnt_flag |= mntflag;
/* Get mbuf for server sockaddr. */
m = m_get(M_WAIT, MT_SONAME);
bcopy(ndmntp->ndm_args.addr, mtod(m, caddr_t),
(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)
panic("nfs_mountroot: mount %s failed: %d", mntname, error);
return (mp);
}
void
nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp,
struct nfs_args *nargp)
{
int adjsock = 0;
int maxio;
#if 0
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
#endif
/* Also re-bind if we're switching to/from a connected UDP socket */
adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
(argp->flags & NFSMNT_NOCONN));
nmp->nm_flag =
(argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL);
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 = MIN(argp->retrans, NFS_MAXREXMIT);
if (!(nmp->nm_flag & NFSMNT_SOFT))
nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */
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_ACREGMIN && argp->acregmin >= 0) {
if (argp->acregmin > 0xffff)
nmp->nm_acregmin = 0xffff;
else
nmp->nm_acregmin = argp->acregmin;
}
if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) {
if (argp->acregmax > 0xffff)
nmp->nm_acregmax = 0xffff;
else
nmp->nm_acregmax = argp->acregmax;
}
if (nmp->nm_acregmin > nmp->nm_acregmax)
nmp->nm_acregmin = nmp->nm_acregmax;
if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) {
if (argp->acdirmin > 0xffff)
nmp->nm_acdirmin = 0xffff;
else
nmp->nm_acdirmin = argp->acdirmin;
}
if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) {
if (argp->acdirmax > 0xffff)
nmp->nm_acdirmax = 0xffff;
else
nmp->nm_acdirmax = argp->acdirmax;
}
if (nmp->nm_acdirmin > nmp->nm_acdirmax)
nmp->nm_acdirmin = nmp->nm_acdirmax;
if (nmp->nm_so && adjsock) {
nfs_disconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp, NULL)) {
printf("nfs_args: retrying connect\n");
tsleep_nsec(&nowake, PSOCK, "nfscon",
SEC_TO_NSEC(1));
}
}
/* Update nargp based on nmp */
nargp->wsize = nmp->nm_wsize;
nargp->rsize = nmp->nm_rsize;
nargp->readdirsize = nmp->nm_readdirsize;
nargp->timeo = nmp->nm_timeo;
nargp->retrans = nmp->nm_retry;
nargp->maxgrouplist = nmp->nm_numgrps;
nargp->readahead = nmp->nm_readahead;
nargp->acregmin = nmp->nm_acregmin;
nargp->acregmax = nmp->nm_acregmax;
nargp->acdirmin = nmp->nm_acdirmin;
nargp->acdirmax = nmp->nm_acdirmax;
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host here and then
* bcopy() it 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.
*/
int
nfs_mount(struct mount *mp, const char *path, void *data,
struct nameidata *ndp, struct proc *p)
{
int error;
struct nfs_args *args = data;
struct mbuf *nam;
struct vnode *vp;
char hst[MNAMELEN];
size_t len;
u_char nfh[NFSX_V3FHMAX];
if (args &&
(args->flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS)
return (EINVAL);
if (nfs_niothreads < 0) {
nfs_niothreads = 4;
nfs_getset_niothreads(1);
}
if (mp->mnt_flag & MNT_UPDATE) {
struct nfsmount *nmp = VFSTONFS(mp);
if (nmp == NULL)
return (EIO);
/*
* When doing an update, we can't change from or to
* v3.
*/
if (args) {
args->flags = (args->flags & ~(NFSMNT_NFSV3)) |
(nmp->nm_flag & (NFSMNT_NFSV3));
nfs_decode_args(nmp, args, &mp->mnt_stat.mount_info.nfs_args);
}
return (0);
}
if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX)
return (EINVAL);
error = copyin(args->fh, nfh, args->fhsize);
if (error)
return (error);
error = copyinstr(args->hostname, hst, MNAMELEN-1, &len);
if (error)
return (error);
memset(&hst[len], 0, MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME);
if (error)
return (error);
args->fh = nfh;
error = mountnfs(args, mp, nam, path, hst, &vp, p);
return (error);
}
/*
* Common code for mount and mountroot
*/
int
mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam,
const char *pth, char *hst, struct vnode **vpp, struct proc *p)
{
struct nfsmount *nmp;
struct nfsnode *np;
struct vnode *vp;
struct vattr attr;
int error;
if (mp->mnt_flag & MNT_UPDATE) {
nmp = VFSTONFS(mp);
/* update paths, file handles, etc, here XXX */
m_freem(nam);
return (0);
} else {
nmp = malloc(sizeof(*nmp), M_NFSMNT,
M_WAITOK|M_ZERO);
mp->mnt_data = nmp;
}
vfs_getnewfsid(mp);
nmp->nm_mountp = mp;
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_acregmin = NFS_MINATTRTIMO;
nmp->nm_acregmax = NFS_MAXATTRTIMO;
nmp->nm_acdirmin = NFS_MINATTRTIMO;
nmp->nm_acdirmax = NFS_MAXATTRTIMO;
mp->mnt_stat.f_namemax = MAXNAMLEN;
memset(mp->mnt_stat.f_mntonname, 0, MNAMELEN);
strlcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN);
memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN);
strlcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN);
memset(mp->mnt_stat.f_mntfromspec, 0, MNAMELEN);
strlcpy(mp->mnt_stat.f_mntfromspec, hst, MNAMELEN);
bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp));
nmp->nm_nam = nam;
nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args);
nfs_ninit(nmp);
TAILQ_INIT(&nmp->nm_reqsq);
timeout_set_proc(&nmp->nm_rtimeout, nfs_timer, nmp);
/* 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, NULL)))
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;
vp = NFSTOV(np);
error = VOP_GETATTR(vp, &attr, p->p_ucred, p);
if (error) {
vput(vp);
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). So, just unlock, but no rele.
*/
nmp->nm_vnode = vp;
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_flag = VROOT;
VOP_UNLOCK(vp);
*vpp = vp;
return (0);
bad:
nfs_disconnect(nmp);
free(nmp, M_NFSMNT, sizeof(*nmp));
m_freem(nam);
return (error);
}
/* unmount system call */
int
nfs_unmount(struct mount *mp, int mntflags, struct proc *p)
{
struct nfsmount *nmp;
struct vnode *vp;
int error, flags = 0;
nmp = VFSTONFS(mp);
error = nfs_root(mp, &vp);
if (error)
return (error);
if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) {
vput(vp);
return (EBUSY);
}
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
error = vflush(mp, vp, flags);
if (error) {
vput(vp);
return (error);
}
/*
* There are two references count to get rid of here: one
* from mountnfs() and one from nfs_root() above.
*/
vrele(vp);
vput(vp);
vgone(vp);
nfs_disconnect(nmp);
m_freem(nmp->nm_nam);
timeout_del(&nmp->nm_rtimeout);
timeout_set_proc(&nmp->nm_rtimeout, nfs_reaper, nmp);
timeout_add(&nmp->nm_rtimeout, 0);
mp->mnt_data = NULL;
return (0);
}
/*
* Delay nfs mount point free until pending or sleeping timeouts have finished.
*/
void
nfs_reaper(void *arg)
{
struct nfsmount *nmp = arg;
free(nmp, M_NFSMNT, sizeof(*nmp));
}
/*
* Return root of a filesystem
*/
int
nfs_root(struct mount *mp, struct vnode **vpp)
{
struct vnode *vp;
struct nfsmount *nmp;
int error;
nmp = VFSTONFS(mp);
vp = nmp->nm_vnode;
vref(vp);
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (error) {
vrele(vp);
return (error);
}
*vpp = vp;
return (0);
}
/*
* Flush out the buffer cache
*/
int
nfs_sync(struct mount *mp, int waitfor, int stall, struct ucred *cred, struct proc *p)
{
struct vnode *vp;
int allerror = 0;
int empty, error, s;
/*
* Don't traverse the vnode list if we want to skip all of them.
*/
if (waitfor == MNT_LAZY)
return (allerror);
/*
* Force stale buffer cache information to be flushed.
*/
loop:
TAILQ_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 (VOP_ISLOCKED(vp))
continue;
s = splbio();
empty = LIST_EMPTY(&vp->v_dirtyblkhd);
splx(s);
if (empty)
continue;
if (vget(vp, LK_EXCLUSIVE))
goto loop;
error = VOP_FSYNC(vp, cred, waitfor, p);
if (error)
allerror = error;
vput(vp);
}
return (allerror);
}
/*
* NFS flat namespace lookup.
* Currently unsupported.
*/
int
nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
return (EOPNOTSUPP);
}
/*
* Do that sysctl thang...
*/
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;
case NFS_NIOTHREADS:
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
*/
int
nfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
{
return (EINVAL);
}
/*
* Vnode pointer to File handle, should never happen either
*/
int
nfs_vptofh(struct vnode *vp, struct fid *fhp)
{
return (EINVAL);
}
/*
* Vfs start routine, a no-op.
*/
int
nfs_start(struct mount *mp, int flags, struct proc *p)
{
return (0);
}
/*
* Do operations associated with quotas, not supported
*/
int
nfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg, struct proc *p)
{
return (EOPNOTSUPP);
}
/*
* check export permission, not supported
*/
/* ARGUSED */
int
nfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp,
struct ucred **credanonp)
{
return (EOPNOTSUPP);
}
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