/* $NetBSD: nfs_vfsops.c,v 1.231 2015/11/02 09:57:43 pgoyette 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 1.231 2015/11/02 09:57:43 pgoyette Exp $"); #if defined(_KERNEL_OPT) #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 #include #include MODULE(MODULE_CLASS_VFS, nfs, NULL); extern struct nfsstats nfsstats; extern int nfs_ticks; /* * keep a count of the nfs mounts to generate ficticious drive names * for the per drive stats. */ unsigned int nfs_mount_count = 0; int nfs_commitsize; /* * 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 = { .vfs_name = MOUNT_NFS, .vfs_min_mount_data = sizeof (struct nfs_args), .vfs_mount = nfs_mount, .vfs_start = nfs_start, .vfs_unmount = nfs_unmount, .vfs_root = nfs_root, .vfs_quotactl = (void *)eopnotsupp, .vfs_statvfs = nfs_statvfs, .vfs_sync = nfs_sync, .vfs_loadvnode = nfs_loadvnode, .vfs_vget = nfs_vget, .vfs_fhtovp = nfs_fhtovp, .vfs_vptofh = nfs_vptofh, .vfs_init = nfs_vfs_init, .vfs_done = nfs_vfs_done, .vfs_mountroot = nfs_mountroot, .vfs_snapshot = (void *)eopnotsupp, .vfs_extattrctl = vfs_stdextattrctl, .vfs_suspendctl = (void *)eopnotsupp, .vfs_renamelock_enter = genfs_renamelock_enter, .vfs_renamelock_exit = genfs_renamelock_exit, .vfs_fsync = (void *)eopnotsupp, .vfs_opv_descs = nfs_vnodeopv_descs }; extern u_int32_t nfs_procids[NFS_NPROCS]; extern u_int32_t nfs_prog, nfs_vers; static struct sysctllog *nfs_clog; static int nfs_mount_diskless(struct nfs_dlmount *, const char *, struct mount **, struct vnode **, struct lwp *); static void nfs_sysctl_init(void); static void nfs_sysctl_fini(void); static int nfs_modcmd(modcmd_t cmd, void *arg) { int error; switch (cmd) { case MODULE_CMD_INIT: error = vfs_attach(&nfs_vfsops); if (error == 0) { nfs_sysctl_init(); } return error; case MODULE_CMD_FINI: error = vfs_detach(&nfs_vfsops); if (error == 0) { nfs_sysctl_fini(); } return error; default: return ENOTTY; } } /* * nfs statvfs call */ int nfs_statvfs(struct mount *mp, struct statvfs *sbp) { struct lwp *l = curlwp; struct vnode *vp; struct nfs_statfs *sfp; char *cp; u_int32_t *tl; int32_t t1, t2; char *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; kauth_cred_t cred; u_quad_t tquad; struct nfsnode *np; #ifndef nolint sfp = (struct nfs_statfs *)0; #endif vp = nmp->nm_vnode; np = VTONFS(vp); cred = kauth_cred_alloc(); #ifndef NFS_V2_ONLY if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) (void)nfs_fsinfo(nmp, vp, cred, l); #endif nfsstats.rpccnt[NFSPROC_FSSTAT]++; nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); nfsm_fhtom(np, v3); nfsm_request(np, NFSPROC_FSSTAT, l, 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; /* Handle older NFS servers returning negative values */ if ((quad_t)sbp->f_bavail < 0) sbp->f_bavail = 0; 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 = NFS_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 = NFS_MAXNAMLEN; } copy_statvfs_info(sbp, mp); nfsm_reqdone; kauth_cred_free(cred); return (error); } #ifndef NFS_V2_ONLY /* * nfs version 3 fsinfo rpc call */ int nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l) { struct nfsv3_fsinfo *fsp; char *cp; int32_t t1, t2; u_int32_t *tl, pref, xmax; char *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, l, 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(void) { struct timespec ts; struct nfs_diskless *nd; struct vattr attr; struct mount *mp; struct vnode *vp; struct lwp *l; long n; int error; l = curlwp; /* XXX */ if (device_class(root_device) != 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 the * current time < nfs_attrtimeo(nmp, np) so keep this in for now. */ if (time_second < NFS_MAXATTRTIMO) { ts.tv_sec = NFS_MAXATTRTIMO; ts.tv_nsec = 0; tc_setclock(&ts); } /* * Call nfs_boot_init() to fill in the nfs_diskless struct. * Side effect: Finds and configures a network interface. */ nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); error = nfs_boot_init(nd, l); if (error) { kmem_free(nd, sizeof(*nd)); return (error); } /* * Create the root mount point. */ error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); if (error) goto out; printf("root on %s\n", nd->nd_root.ndm_host); /* * Link it into the mount list. */ mountlist_append(mp); rootvp = vp; mp->mnt_vnodecovered = NULLVP; vfs_unbusy(mp, false, NULL); /* Get root attributes (for the time). */ vn_lock(vp, LK_SHARED | LK_RETRY); error = VOP_GETATTR(vp, &attr, l->l_cred); VOP_UNLOCK(vp); 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, l); kmem_free(nd, sizeof(*nd)); 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(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l) /* mntname: mount point name */ { 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, void *), (void *)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, l); if (error) { vfs_unbusy(mp, false, NULL); vfs_destroy(mp); printf("nfs_mountroot: mount %s failed: %d\n", mntname, error); } else *mpp = mp; return (error); } void nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l) { 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_DEADTHRESH) && argp->deadthresh >= 1 && argp->deadthresh <= NFS_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, l)) { printf("nfs_args: retrying connect\n"); kpause("nfscn3", false, hz, NULL); } } } /* * 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(struct mount *mp, const char *path, void *data, size_t *data_len) { struct lwp *l = curlwp; int error; struct nfs_args *args = data; struct mbuf *nam; struct nfsmount *nmp = VFSTONFS(mp); struct sockaddr *sa; struct vnode *vp; char *pth, *hst; size_t len; u_char *nfh; if (args == NULL) return EINVAL; if (*data_len < sizeof *args) return EINVAL; 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 = 0; /* dummy */ args->deadthresh = nmp->nm_deadthresh; args->hostname = NULL; *data_len = sizeof *args; return 0; } if (args->version != NFS_ARGSVERSION) return (EPROGMISMATCH); if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) return (EPROGUNAVAIL); #ifdef NFS_V2_ONLY 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, or change cookie translation */ args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); nfs_decode_args(nmp, args, l); return (0); } if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) return (EINVAL); nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK); error = copyin(args->fh, nfh, args->fhsize); if (error) goto free_nfh; pth = malloc(MNAMELEN, M_TEMP, M_WAITOK); error = copyinstr(path, pth, MNAMELEN - 1, &len); if (error) goto free_pth; memset(&pth[len], 0, MNAMELEN - len); hst = malloc(MNAMELEN, M_TEMP, M_WAITOK); error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); if (error) goto free_hst; 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) goto free_hst; MCLAIM(nam, &nfs_mowner); args->fh = nfh; error = mountnfs(args, mp, nam, pth, hst, &vp, l); 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(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l) { struct nfsmount *nmp; struct nfsnode *np; struct vnode *vp; int error; struct vattr *attrs; kauth_cred_t cr; char iosname[IOSTATNAMELEN]; /* * If the number of nfs iothreads to use has never * been set, create a reasonable number of them. */ if (nfs_niothreads < 0) { nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); } if (mp->mnt_flag & MNT_UPDATE) { nmp = VFSTONFS(mp); /* update paths, file handles, etc, here XXX */ m_freem(nam); return (0); } else { nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); mp->mnt_data = nmp; TAILQ_INIT(&nmp->nm_uidlruhead); TAILQ_INIT(&nmp->nm_bufq); rw_init(&nmp->nm_writeverflock); mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); cv_init(&nmp->nm_rcvcv, "nfsrcv"); cv_init(&nmp->nm_sndcv, "nfssnd"); cv_init(&nmp->nm_aiocv, "nfsaio"); cv_init(&nmp->nm_disconcv, "nfsdis"); } vfs_getnewfsid(mp); nmp->nm_mountp = mp; #ifndef NFS_V2_ONLY if ((argp->flags & NFSMNT_NFSV3) == 0) #endif { if (argp->fhsize != NFSX_V2FH) { return EINVAL; } } /* * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo * will overwrite this. */ 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_deadthresh = NFS_DEFDEADTHRESH; error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp->mnt_op->vfs_name, mp, l); 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, l); 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, l))) 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; vp = NFSTOV(np); attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK); VOP_GETATTR(vp, attrs, l->l_cred); if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) { cr = kauth_cred_alloc(); kauth_cred_setuid(cr, attrs->va_uid); kauth_cred_seteuid(cr, attrs->va_uid); kauth_cred_setsvuid(cr, attrs->va_uid); kauth_cred_setgid(cr, attrs->va_gid); kauth_cred_setegid(cr, attrs->va_gid); kauth_cred_setsvgid(cr, attrs->va_gid); nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr); kauth_cred_free(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 == UFS_ROOTINO (2). So, just unlock, but no rele. */ nmp->nm_vnode = vp; if (vp->v_type == VNON) vp->v_type = VDIR; vp->v_vflag |= VV_ROOT; VOP_UNLOCK(vp); *vpp = vp; snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); return (0); bad: nfs_disconnect(nmp); rw_destroy(&nmp->nm_writeverflock); mutex_destroy(&nmp->nm_lock); cv_destroy(&nmp->nm_rcvcv); cv_destroy(&nmp->nm_sndcv); cv_destroy(&nmp->nm_aiocv); cv_destroy(&nmp->nm_disconcv); kmem_free(nmp, sizeof(*nmp)); m_freem(nam); return (error); } /* * unmount system call */ int nfs_unmount(struct mount *mp, int mntflags) { struct nfsmount *nmp = VFSTONFS(mp); struct vnode *vp; int error, flags = 0; if (mntflags & MNT_FORCE) { mutex_enter(&nmp->nm_lock); flags |= FORCECLOSE; nmp->nm_iflag |= NFSMNT_DISMNTFORCE; mutex_exit(&nmp->nm_lock); } /* * 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(). */ vp = nmp->nm_vnode; error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (error != 0) goto err; if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) { VOP_UNLOCK(vp); error = EBUSY; goto err; } error = vflush(mp, vp, flags); if (error) { VOP_UNLOCK(vp); goto err; } /* * 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; /* * No new async I/O will be added, but await for pending * ones to drain. */ while (nfs_iodbusy(nmp)) kpause("nfsumnt", false, hz, NULL); /* * Clean up the stats... note that we carefully avoid decrementing * nfs_mount_count here for good reason - we may not be unmounting * the last thing mounted. */ iostat_free(nmp->nm_stats); /* * There is one reference count to get rid of here * (see comment in mountnfs()). */ VOP_UNLOCK(vp); vgone(vp); nfs_disconnect(nmp); m_freem(nmp->nm_nam); rw_destroy(&nmp->nm_writeverflock); mutex_destroy(&nmp->nm_lock); cv_destroy(&nmp->nm_rcvcv); cv_destroy(&nmp->nm_sndcv); cv_destroy(&nmp->nm_aiocv); cv_destroy(&nmp->nm_disconcv); kmem_free(nmp, sizeof(*nmp)); return (0); err: if (mntflags & MNT_FORCE) { mutex_enter(&nmp->nm_lock); nmp->nm_iflag &= ~NFSMNT_DISMNTFORCE; mutex_exit(&nmp->nm_lock); } return error; } /* * 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 != 0) { vrele(vp); return error; } *vpp = vp; return (0); } extern int syncprt; static bool nfs_sync_selector(void *cl, struct vnode *vp) { return !LIST_EMPTY(&vp->v_dirtyblkhd) || !UVM_OBJ_IS_CLEAN(&vp->v_uobj); } /* * Flush out the buffer cache */ /* ARGSUSED */ int nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) { struct vnode *vp; struct vnode_iterator *marker; int error, allerror = 0; /* * Force stale buffer cache information to be flushed. */ vfs_vnode_iterator_init(mp, &marker); while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector, NULL))) { error = vn_lock(vp, LK_EXCLUSIVE); if (error) { vrele(vp); continue; } error = VOP_FSYNC(vp, cred, waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); if (error) allerror = error; vput(vp); } vfs_vnode_iterator_destroy(marker); return allerror; } /* * NFS flat namespace lookup. * Currently unsupported. */ /* ARGSUSED */ int nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) { return (EOPNOTSUPP); } /* * Do that sysctl thang... */ static int sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) { struct sysctlnode node; int val; int error; val = nfs_niothreads; node = *rnode; node.sysctl_data = &val; error = sysctl_lookup(SYSCTLFN_CALL(&node)); if (error || newp == NULL) return error; return nfs_set_niothreads(val); } static void nfs_sysctl_init(void) { sysctl_createv(&nfs_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(&nfs_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(&nfs_clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "iothreads", SYSCTL_DESCR("Number of NFS client processes desired"), sysctl_vfs_nfs_iothreads, 0, NULL, 0, CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); } static void nfs_sysctl_fini(void) { sysctl_teardown(&nfs_clog); } /* ARGSUSED */ int nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) { size_t fidsize; size_t fhsize; struct nfsnode *np; int error; struct vattr va; fidsize = fid->fid_len; if (fidsize < sizeof(*fid)) { return EINVAL; } fhsize = fidsize - sizeof(*fid); if ((fhsize % NFSX_UNSIGNED) != 0) { return EINVAL; } if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { if (fhsize > NFSX_V3FHMAX || fhsize == 0) { return EINVAL; } } else { if (fhsize != NFSX_V2FH) { return EINVAL; } } error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); if (error) { return error; } *vpp = NFSTOV(np); error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); if (error != 0) { vput(*vpp); *vpp = NULLVP; } return error; } /* ARGSUSED */ int nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) { struct nfsnode *np; struct fid *fid; size_t fidsize; int error = 0; np = VTONFS(vp); fidsize = sizeof(*fid) + np->n_fhsize; if (*bufsize < fidsize) { error = E2BIG; } *bufsize = fidsize; if (error == 0) { struct fid fid_store; fid = &fid_store; memset(fid, 0, sizeof(*fid)); fid->fid_len = fidsize; memcpy(buf, fid, sizeof(*fid)); memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); } return error; } /* * Vfs start routine, a no-op. */ /* ARGSUSED */ int nfs_start(struct mount *mp, int flags) { return (0); } /* * Called once at VFS init to initialize client-specific data structures. */ void nfs_vfs_init(void) { /* Initialize NFS server / client shared data. */ nfs_init(); nfs_node_init(); /* Initialize the kqueue structures */ nfs_kqinit(); /* Initialize the iod structures */ nfs_iodinit(); nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4); } void nfs_vfs_done(void) { nfs_node_done(); nfs_kqfini(); nfs_iodfini(); nfs_fini(); }