/* $NetBSD: nfs_vfsops.c,v 1.27 1994/07/03 09:24:01 mycroft Exp $ */ /* * Copyright (c) 1989, 1993 * 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 8.3 (Berkeley) 1/4/94 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * nfs vfs operations. */ 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_init, }; extern u_long nfs_procids[NFS_NPROCS]; extern u_long nfs_prog, nfs_vers; void nfs_disconnect __P((struct nfsmount *)); static struct mount * nfs_mount_diskless __P((struct nfs_dlmount *, char *, int, struct vnode **)); #define TRUE 1 #define FALSE 0 /* * nfs statfs call */ int nfs_statfs(mp, sbp, p) struct mount *mp; register struct statfs *sbp; struct proc *p; { register struct vnode *vp; register struct nfsv2_statfs *sfp; register caddr_t cp; register long t1; caddr_t bpos, dpos, cp2; int error = 0, isnq; struct mbuf *mreq, *mrep, *md, *mb, *mb2; struct nfsmount *nmp; struct ucred *cred; struct nfsnode *np; nmp = VFSTONFS(mp); isnq = (nmp->nm_flag & NFSMNT_NQNFS); if (error = nfs_nget(mp, &nmp->nm_fh, &np)) return (error); vp = NFSTOV(np); nfsstats.rpccnt[NFSPROC_STATFS]++; cred = crget(); cred->cr_ngroups = 1; nfsm_reqhead(vp, NFSPROC_STATFS, NFSX_FH); nfsm_fhtom(vp); nfsm_request(vp, NFSPROC_STATFS, p, cred); nfsm_dissect(sfp, struct nfsv2_statfs *, NFSX_STATFS(isnq)); #ifdef COMPAT_09 sbp->f_type = 2; #else sbp->f_type = 0; #endif sbp->f_flags = nmp->nm_flag; sbp->f_iosize = NFS_MAXDGRAMDATA; sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize); sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); if (isnq) { sbp->f_files = fxdr_unsigned(long, sfp->sf_files); sbp->f_ffree = fxdr_unsigned(long, sfp->sf_ffree); } else { sbp->f_files = 0; sbp->f_ffree = 0; } if (sbp != &mp->mnt_stat) { bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); } strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); sbp->f_fstypename[MFSNAMELEN] = '\0'; nfsm_reqdone; vrele(vp); crfree(cred); return (error); } /* * 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() { struct nfs_diskless nd; struct vattr attr; struct mount *mp; struct vnode *vp; struct proc *procp; struct ucred *cred; long n; int error; procp = curproc; /* XXX */ /* * 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. */ bzero((caddr_t) &nd, sizeof(nd)); nfs_boot_init(&nd, procp); /* * Create the root mount point. */ mp = nfs_mount_diskless(&nd.nd_root, "/", MNT_RDONLY, &vp); /* * Link it into the mount list. */ if (vfs_lock(mp)) panic("nfs_mountroot: vfs_lock"); TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); mp->mnt_flag |= MNT_ROOTFS; mp->mnt_vnodecovered = NULLVP; vfs_unlock(mp); rootvp = vp; /* 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_mtime.ts_sec; #ifdef DEBUG printf(" root time: 0x%x\n", n); #endif inittodr(n); #ifdef notyet /* Set up swap credentials. */ proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > NGROUPS) proc0.p_ucred->cr_ngroups = NGROUPS; for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) proc0.p_ucred->cr_groups[i] = ntohl(nd.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 (bdevvp(swapdev, &swapdev_vp)) panic("nfs_mountroot: can't setup swap vp"); if (swdevt[0].sw_dev != NODEV) 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. */ mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); /* * 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; swdevt[0].sw_vp = vp; /* * Find out how large the swap file is. */ error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); if (error) panic("nfs_mountroot: getattr for swap"); n = (long) (attr.va_size >> DEV_BSHIFT); #ifdef DEBUG printf(" swap size: 0x%x (blocks)\n", n); #endif swdevt[0].sw_nblks = n; return (0); } /* * Internal version of mount system call for diskless setup. */ static struct mount * nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) struct nfs_dlmount *ndmntp; char *mntname; int mntflag; struct vnode **vpp; { struct nfs_args args; struct mount *mp; struct mbuf *m; int error; /* Create the mount point. */ mp = (struct mount *)malloc((u_long)sizeof(struct mount), M_MOUNT, M_NOWAIT); if (mp == NULL) panic("nfs_mountroot: malloc mount for %s", mntname); bzero((char *)mp, (u_long)sizeof(struct mount)); mp->mnt_op = &nfs_vfsops; mp->mnt_flag = mntflag; /* Initialize mount args. */ bzero((caddr_t) &args, sizeof(args)); args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; args.addrlen = args.addr->sa_len; args.sotype = SOCK_DGRAM; args.fh = (nfsv2fh_t *)ndmntp->ndm_fh; args.hostname = ndmntp->ndm_host; /* Get mbuf for server sockaddr. */ MGET(m, MT_SONAME, M_DONTWAIT); if (m == NULL) panic("nfs_mountroot: mget soname for %s", mntname); bcopy((caddr_t)args.addr, mtod(m, caddr_t), (m->m_len = args.addr->sa_len)); if (error = mountnfs(&args, mp, m, mntname, args.hostname, vpp)) panic("nfs_mountroot: mount %s failed: %d", mntname); return (mp); } void nfs_decode_args(nmp, argp) struct nfsmount *nmp; struct nfs_args *argp; { int s; s = splnet(); /* Update flags atomically. Don't change the lock bits. */ nmp->nm_flag = (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 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; } if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { nmp->nm_wsize = argp->wsize; /* Round down to multiple of blocksize */ nmp->nm_wsize &= ~0x1ff; if (nmp->nm_wsize <= 0) nmp->nm_wsize = 512; else if (nmp->nm_wsize > NFS_MAXDATA) nmp->nm_wsize = NFS_MAXDATA; } if (nmp->nm_wsize > MAXBSIZE) nmp->nm_wsize = MAXBSIZE; if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { nmp->nm_rsize = argp->rsize; /* Round down to multiple of blocksize */ nmp->nm_rsize &= ~0x1ff; if (nmp->nm_rsize <= 0) nmp->nm_rsize = 512; else if (nmp->nm_rsize > NFS_MAXDATA) nmp->nm_rsize = NFS_MAXDATA; } if (nmp->nm_rsize > MAXBSIZE) nmp->nm_rsize = MAXBSIZE; 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; } /* * VFS Operations. * * mount system call * It seems a bit dumb to copyinstr() the host and path here and then * bcopy() them in mountnfs(), but I wanted to detect errors before * doing the sockargs() call because sockargs() allocates an mbuf and * an error after that means that I have to release the mbuf. */ /* ARGSUSED */ int nfs_mount(mp, path, data, ndp, p) struct mount *mp; char *path; caddr_t data; struct nameidata *ndp; struct proc *p; { int error; struct nfs_args args; struct mbuf *nam; struct vnode *vp; char pth[MNAMELEN], hst[MNAMELEN]; u_int len; nfsv2fh_t nfh; if (error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args))) return (error); if (mp->mnt_flag & MNT_UPDATE) { register struct nfsmount *nmp = VFSTONFS(mp); if (nmp == NULL) return (EIO); nfs_decode_args(nmp, &args); return (0); } if (error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t))) return (error); if (error = copyinstr(path, pth, MNAMELEN-1, &len)) return (error); bzero(&pth[len], MNAMELEN - len); if (error = copyinstr(args.hostname, hst, MNAMELEN-1, &len)) return (error); bzero(&hst[len], MNAMELEN - len); /* sockargs() call must be after above copyin() calls */ if (error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME)) return (error); args.fh = &nfh; error = mountnfs(&args, mp, nam, pth, hst, &vp); return (error); } /* * Common code for mount and mountroot */ int mountnfs(argp, mp, nam, pth, hst, vpp) register struct nfs_args *argp; register struct mount *mp; struct mbuf *nam; char *pth, *hst; struct vnode **vpp; { register struct nfsmount *nmp; struct nfsnode *np; int error; 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); bzero((caddr_t)nmp, sizeof (struct nfsmount)); mp->mnt_data = (qaddr_t)nmp; } getnewfsid(mp, makefstype(MOUNT_NFS)); nmp->nm_mountp = mp; if ((argp->flags & (NFSMNT_NQNFS | NFSMNT_MYWRITE)) == (NFSMNT_NQNFS | NFSMNT_MYWRITE)) { error = EPERM; goto bad; } 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; nmp->nm_timeo = NFS_TIMEO; nmp->nm_retry = NFS_RETRANS; nmp->nm_wsize = NFS_WSIZE; nmp->nm_rsize = NFS_RSIZE; nmp->nm_numgrps = NFS_MAXGRPS; nmp->nm_readahead = NFS_DEFRAHEAD; nmp->nm_leaseterm = NQ_DEFLEASE; nmp->nm_deadthresh = NQ_DEADTHRESH; nmp->nm_tnext = (struct nfsnode *)nmp; nmp->nm_tprev = (struct nfsnode *)nmp; nmp->nm_inprog = NULLVP; bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t)); #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); mp->mnt_stat.f_fstypename[MFSNAMELEN] = '\0'; bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); nmp->nm_nam = nam; nfs_decode_args(nmp, argp); /* 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, (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; /* * A reference count is needed on the nfsnode representing the * remote root. If this object is not persistent, then backward * traversals of the mount point (i.e. "..") will not work if * the nfsnode gets flushed out of the cache. Ufs does not have * this problem, because one can identify root inodes by their * number == ROOTINO (2). */ if (error = nfs_nget(mp, &nmp->nm_fh, &np)) goto bad; *vpp = NFSTOV(np); 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; { register struct nfsmount *nmp; struct nfsnode *np; struct vnode *vp; int error, flags = 0; extern int doforce; if (mntflags & MNT_FORCE) { if (!doforce || (mp->mnt_flag & MNT_ROOTFS)) return (EINVAL); 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! */ if (error = nfs_nget(mp, &nmp->nm_fh, &np)) return(error); vp = NFSTOV(np); if (vp->v_usecount > 2) { vput(vp); return (EBUSY); } /* * Must handshake with nqnfs_clientd() if it is active. */ nmp->nm_flag |= NFSMNT_DISMINPROG; while (nmp->nm_inprog != NULLVP) (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); if (error = vflush(mp, vp, flags)) { vput(vp); nmp->nm_flag &= ~NFSMNT_DISMINPROG; return (error); } /* * We are now committed to the unmount. * For NQNFS, let the server daemon free the nfsmount structure. */ if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) nmp->nm_flag |= NFSMNT_DISMNT; /* * There are two reference counts to get rid of here. */ vrele(vp); vrele(vp); vgone(vp); nfs_disconnect(nmp); m_freem(nmp->nm_nam); 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; { register struct vnode *vp; struct nfsmount *nmp; struct nfsnode *np; int error; nmp = VFSTONFS(mp); if (error = nfs_nget(mp, &nmp->nm_fh, &np)) return (error); vp = NFSTOV(np); vp->v_type = VDIR; vp->v_flag = VROOT; *vpp = vp; return (0); } extern int syncprt; /* * Flush out the buffer cache */ /* ARGSUSED */ int nfs_sync(mp, waitfor, cred, p) struct mount *mp; int waitfor; struct ucred *cred; struct proc *p; { register 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 (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) continue; if (vget(vp, 1)) goto loop; if (error = VOP_FSYNC(vp, cred, waitfor, p)) 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); } /* * At this point, this should never happen */ /* ARGSUSED */ int nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) register struct mount *mp; struct fid *fhp; struct mbuf *nam; struct vnode **vpp; 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); }