/* $NetBSD: nfs_vfsops.c,v 1.147 2005/05/29 20:58:13 christos 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 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.147 2005/05/29 20:58:13 christos Exp $"); #if defined(_KERNEL_OPT) #include "opt_compat_netbsd.h" #include "opt_nfs.h" #endif #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 #include #include #include #include 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, NULL, nfs_mountroot, nfs_checkexp, (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(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); /*XXXUNCONST*/ error = sysctl_lookup(SYSCTLFN_CALL(__UNCONST(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); } /* ARGSUSED */ int nfs_checkexp(mp, nam, exflagsp, credanonp) struct mount *mp; struct mbuf *nam; int *exflagsp; struct ucred **credanonp; { return (EINVAL); } /* * Vnode pointer to File handle, should never happen either */ /* ARGSUSED */ int nfs_vptofh(vp, fhp) struct vnode *vp; struct fid *fhp; { return (EINVAL); } /* * Vfs start routine, a no-op. */ /* ARGSUSED */ int nfs_start(mp, flags, p) struct mount *mp; int flags; struct proc *p; { return (0); } /* * Do operations associated with quotas, not supported */ /* ARGSUSED */ int nfs_quotactl(mp, cmd, uid, arg, p) struct mount *mp; int cmd; uid_t uid; void *arg; struct proc *p; { return (EOPNOTSUPP); }