/* $OpenBSD: nfs_vfsops.c,v 1.132 2024/10/30 06:16:27 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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] == 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] != NODEV) identifying the swap device. */ if (swdevt[0] != NODEV) { if (bdevvp(swapdev, &swapdev_vp)) panic("nfs_mountroot: can't setup swap vp"); printf("swap on device 0x%x\n", swdevt[0]); return (0); } /* * If swapping to an nfs node: (swdevt[0] == 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] = 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] = 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); }