/*- * 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. * 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_serv.c 8.8 (Berkeley) 7/31/95 */ #include __FBSDID("$FreeBSD$"); /* * nfs version 2 and 3 server calls to vnode ops * - these routines generally have 3 phases * 1 - break down and validate rpc request in mbuf list * 2 - do the vnode ops for the request * (surprisingly ?? many are very similar to syscalls in vfs_syscalls.c) * 3 - build the rpc reply in an mbuf list * nb: * - do not mix the phases, since the nfsm_?? macros can return failures * on a bad rpc or similar and do not do any vrele() or vput()'s * * - the nfsm_reply() macro generates an nfs rpc reply with the nfs * error number iff error != 0 whereas * returning an error from the server function implies a fatal error * such as a badly constructed rpc request that should be dropped without * a reply. * For nfsm_reply(), the case where error == EBADRPC is treated * specially; after constructing a reply, it does an immediate * `goto nfsmout' to avoid getting any V3 post-op status appended. * * Other notes: * Warning: always pay careful attention to resource cleanup on return * and note that nfsm_*() macros can terminate a procedure on certain * errors. * * lookup() and namei() * may return garbage in various structural fields/return elements * if an error is returned, and may garbage up nd.ni_dvp even if no * error is returned and you did not request LOCKPARENT or WANTPARENT. * * We use the ni_cnd.cn_flags 'HASBUF' flag to track whether the name * buffer has been freed or not. */ #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 #ifdef NFSRV_DEBUG #define nfsdbprintf(info) printf info #else #define nfsdbprintf(info) #endif #define MAX_COMMIT_COUNT (1024 * 1024) #define NUM_HEURISTIC 1017 #define NHUSE_INIT 64 #define NHUSE_INC 16 #define NHUSE_MAX 2048 static struct nfsheur { struct vnode *nh_vp; /* vp to match (unreferenced pointer) */ off_t nh_nextr; /* next offset for sequential detection */ int nh_use; /* use count for selection */ int nh_seqcount; /* heuristic */ } nfsheur[NUM_HEURISTIC]; /* Global vars */ int nfsrvw_procrastinate = NFS_GATHERDELAY * 1000; int nfsrvw_procrastinate_v3 = 0; static struct timeval nfsver = { 0 }; SYSCTL_NODE(_vfs, OID_AUTO, nfsrv, CTLFLAG_RW, 0, "NFS server"); static int nfs_async; static int nfs_commit_blks; static int nfs_commit_miss; SYSCTL_INT(_vfs_nfsrv, OID_AUTO, async, CTLFLAG_RW, &nfs_async, 0, "Tell client that writes were synced even though they were not"); SYSCTL_INT(_vfs_nfsrv, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks, 0, "Number of completed commits"); SYSCTL_INT(_vfs_nfsrv, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss, 0, ""); struct nfsrvstats nfsrvstats; SYSCTL_STRUCT(_vfs_nfsrv, NFS_NFSRVSTATS, nfsrvstats, CTLFLAG_RW, &nfsrvstats, nfsrvstats, "S,nfsrvstats"); static int nfsrv_access(struct vnode *, accmode_t, struct ucred *, int, int); /* * Clear nameidata fields that are tested in nsfmout cleanup code prior * to using first nfsm macro (that might jump to the cleanup code). */ static __inline void ndclear(struct nameidata *nd) { nd->ni_cnd.cn_flags = 0; nd->ni_vp = NULL; nd->ni_dvp = NULL; nd->ni_startdir = NULL; } /* * Takes two vfslocked integers and returns with at most one * reference to giant. The return value indicates whether giant * is held by either lock. This simplifies nfsrv ops by allowing * them to track only one vfslocked var. */ static __inline int nfsrv_lockedpair(int vfs1, int vfs2) { if (vfs1 && vfs2) VFS_UNLOCK_GIANT(vfs2); return (vfs1 | vfs2); } static __inline int nfsrv_lockedpair_nd(int vfs1, struct nameidata *nd) { int vfs2; vfs2 = NDHASGIANT(nd); return nfsrv_lockedpair(vfs1, vfs2); } /* * nfs v3 access service */ int nfsrv3_access(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct vnode *vp = NULL; nfsfh_t nfh; fhandle_t *fhp; u_int32_t *tl; caddr_t bpos; int error = 0, rdonly, getret; struct mbuf *mb, *mreq; struct vattr vattr, *vap = &vattr; u_long testmode, nfsmode; int v3 = (nfsd->nd_flag & ND_NFSV3); int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); if (!v3) panic("nfsrv3_access: v3 proc called on a v2 connection"); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED); error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (error) { nfsm_reply(NFSX_UNSIGNED); nfsm_srvpostop_attr(1, NULL); error = 0; goto nfsmout; } nfsmode = fxdr_unsigned(u_int32_t, *tl); if ((nfsmode & NFSV3ACCESS_READ) && nfsrv_access(vp, VREAD, cred, rdonly, 0)) nfsmode &= ~NFSV3ACCESS_READ; if (vp->v_type == VDIR) testmode = (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | NFSV3ACCESS_DELETE); else testmode = (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); if ((nfsmode & testmode) && nfsrv_access(vp, VWRITE, cred, rdonly, 0)) nfsmode &= ~testmode; if (vp->v_type == VDIR) testmode = NFSV3ACCESS_LOOKUP; else testmode = NFSV3ACCESS_EXECUTE; if ((nfsmode & testmode) && nfsrv_access(vp, VEXEC, cred, rdonly, 0)) nfsmode &= ~testmode; getret = VOP_GETATTR(vp, vap, cred); vput(vp); vp = NULL; nfsm_reply(NFSX_POSTOPATTR(1) + NFSX_UNSIGNED); nfsm_srvpostop_attr(getret, vap); tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); *tl = txdr_unsigned(nfsmode); nfsmout: if (vp) vput(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs getattr service */ int nfsrv_getattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct nfs_fattr *fp; struct vattr va; struct vattr *vap = &va; struct vnode *vp = NULL; nfsfh_t nfh; fhandle_t *fhp; caddr_t bpos; int error = 0, rdonly; struct mbuf *mb, *mreq; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (error) { nfsm_reply(0); error = 0; goto nfsmout; } error = VOP_GETATTR(vp, vap, cred); vput(vp); vp = NULL; nfsm_reply(NFSX_FATTR(nfsd->nd_flag & ND_NFSV3)); if (error) { error = 0; goto nfsmout; } fp = nfsm_build(struct nfs_fattr *, NFSX_FATTR(nfsd->nd_flag & ND_NFSV3)); nfsm_srvfillattr(vap, fp); /* fall through */ nfsmout: if (vp) vput(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs setattr service */ int nfsrv_setattr(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct vattr va, preat; struct vattr *vap = &va; struct nfsv2_sattr *sp; struct nfs_fattr *fp; struct vnode *vp = NULL; nfsfh_t nfh; fhandle_t *fhp; u_int32_t *tl; caddr_t bpos; int error = 0, rdonly, preat_ret = 1, postat_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3), gcheck = 0; struct mbuf *mb, *mreq; struct timespec guard = { 0, 0 }; struct mount *mp = NULL; int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto out; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ VATTR_NULL(vap); if (v3) { nfsm_srvsattr(vap); tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED); gcheck = fxdr_unsigned(int, *tl); if (gcheck) { tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED); fxdr_nfsv3time(tl, &guard); } } else { sp = nfsm_dissect_nonblock(struct nfsv2_sattr *, NFSX_V2SATTR); /* * Nah nah nah nah na nah * There is a bug in the Sun client that puts 0xffff in the mode * field of sattr when it should put in 0xffffffff. The u_short * doesn't sign extend. * --> check the low order 2 bytes for 0xffff */ if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff) vap->va_mode = nfstov_mode(sp->sa_mode); if (sp->sa_uid != nfsrv_nfs_xdrneg1) vap->va_uid = fxdr_unsigned(uid_t, sp->sa_uid); if (sp->sa_gid != nfsrv_nfs_xdrneg1) vap->va_gid = fxdr_unsigned(gid_t, sp->sa_gid); if (sp->sa_size != nfsrv_nfs_xdrneg1) vap->va_size = fxdr_unsigned(u_quad_t, sp->sa_size); if (sp->sa_atime.nfsv2_sec != nfsrv_nfs_xdrneg1) { #ifdef notyet fxdr_nfsv2time(&sp->sa_atime, &vap->va_atime); #else vap->va_atime.tv_sec = fxdr_unsigned(int32_t, sp->sa_atime.nfsv2_sec); vap->va_atime.tv_nsec = 0; #endif } if (sp->sa_mtime.nfsv2_sec != nfsrv_nfs_xdrneg1) fxdr_nfsv2time(&sp->sa_mtime, &vap->va_mtime); } /* * Now that we have all the fields, lets do it. */ error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp, nam, &rdonly, TRUE); vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked); if (error) { nfsm_reply(2 * NFSX_UNSIGNED); if (v3) nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap); error = 0; goto nfsmout; } /* * vp now an active resource, pay careful attention to cleanup */ if (v3) { error = preat_ret = VOP_GETATTR(vp, &preat, cred); if (!error && gcheck && (preat.va_ctime.tv_sec != guard.tv_sec || preat.va_ctime.tv_nsec != guard.tv_nsec)) error = NFSERR_NOT_SYNC; if (error) { vput(vp); vp = NULL; nfsm_reply(NFSX_WCCDATA(v3)); if (v3) nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap); error = 0; goto nfsmout; } } /* * If the size is being changed write acces is required, otherwise * just check for a read only filesystem. */ if (vap->va_size == ((u_quad_t)((quad_t) -1))) { if (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) { error = EROFS; goto out; } } else { if (vp->v_type == VDIR) { error = EISDIR; goto out; } else if ((error = nfsrv_access(vp, VWRITE, cred, rdonly, 0)) != 0) goto out; } error = VOP_SETATTR(vp, vap, cred); postat_ret = VOP_GETATTR(vp, vap, cred); if (!error) error = postat_ret; out: if (vp != NULL) vput(vp); vp = NULL; nfsm_reply(NFSX_WCCORFATTR(v3)); if (v3) { nfsm_srvwcc_data(preat_ret, &preat, postat_ret, vap); } else if (!error) { /* v2 non-error case. */ fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR); nfsm_srvfillattr(vap, fp); } error = 0; /* fall through */ nfsmout: if (vp) vput(vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs lookup rpc */ int nfsrv_lookup(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct nfs_fattr *fp; struct nameidata nd, ind, *ndp = &nd; struct vnode *vp, *dirp = NULL; nfsfh_t nfh; fhandle_t *fhp; caddr_t bpos; int error = 0, len, dirattr_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3), pubflag; struct mbuf *mb, *mreq; struct vattr va, dirattr, *vap = &va; int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); ndclear(&nd); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); nfsm_srvnamesiz(len); pubflag = nfs_ispublicfh(fhp); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = LOOKUP; nd.ni_cnd.cn_flags = LOCKLEAF | SAVESTART | MPSAFE; error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirattr, &dirattr_ret, pubflag); vfslocked = NDHASGIANT(&nd); /* * namei failure, only dirp to cleanup. Clear out garbarge from * structure in case macros jump to nfsmout. */ if (error) { if (dirp) { vrele(dirp); dirp = NULL; } nfsm_reply(NFSX_POSTOPATTR(v3)); if (v3) nfsm_srvpostop_attr(dirattr_ret, &dirattr); error = 0; goto nfsmout; } /* * Locate index file for public filehandle * * error is 0 on entry and 0 on exit from this block. */ if (pubflag) { if (nd.ni_vp->v_type == VDIR && nfs_pub.np_index != NULL) { /* * Setup call to lookup() to see if we can find * the index file. Arguably, this doesn't belong * in a kernel.. Ugh. If an error occurs, do not * try to install an index file and then clear the * error. * * When we replace nd with ind and redirect ndp, * maintenance of ni_startdir and ni_vp shift to * ind and we have to clean them up in the old nd. * However, the cnd resource continues to be maintained * via the original nd. Confused? You aren't alone! */ ind = nd; VOP_UNLOCK(nd.ni_vp, 0); ind.ni_pathlen = strlen(nfs_pub.np_index); ind.ni_cnd.cn_nameptr = ind.ni_cnd.cn_pnbuf = nfs_pub.np_index; ind.ni_startdir = nd.ni_vp; VREF(ind.ni_startdir); ind.ni_cnd.cn_flags &= ~GIANTHELD; tvfslocked = VFS_LOCK_GIANT(ind.ni_startdir->v_mount); if (tvfslocked) nd.ni_cnd.cn_flags |= GIANTHELD; error = lookup(&ind); ind.ni_dvp = NULL; vfslocked = nfsrv_lockedpair_nd(vfslocked, &ind); ind.ni_cnd.cn_flags &= ~GIANTHELD; if (error == 0) { /* * Found an index file. Get rid of * the old references. transfer nd.ni_vp' */ if (dirp) vrele(dirp); dirp = nd.ni_vp; nd.ni_vp = NULL; vrele(nd.ni_startdir); nd.ni_startdir = NULL; ndp = &ind; } error = 0; } /* * If the public filehandle was used, check that this lookup * didn't result in a filehandle outside the publicly exported * filesystem. We clear the poor vp here to avoid lockups due * to NFS I/O. */ if (ndp->ni_vp->v_mount != nfs_pub.np_mount) { vput(nd.ni_vp); nd.ni_vp = NULL; error = EPERM; } } /* * Resources at this point: * ndp->ni_vp may not be NULL */ if (error) { nfsm_reply(NFSX_POSTOPATTR(v3)); if (v3) nfsm_srvpostop_attr(dirattr_ret, &dirattr); error = 0; goto nfsmout; } /* * Get underlying attribute, then release remaining resources ( for * the same potential blocking reason ) and reply. */ vp = ndp->ni_vp; bzero((caddr_t)fhp, sizeof(nfh)); fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid; error = VOP_VPTOFH(vp, &fhp->fh_fid); if (!error) error = VOP_GETATTR(vp, vap, cred); vput(vp); vrele(ndp->ni_startdir); vrele(dirp); ndp->ni_vp = NULL; ndp->ni_startdir = NULL; dirp = NULL; nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPORFATTR(v3) + NFSX_POSTOPATTR(v3)); if (error) { if (v3) nfsm_srvpostop_attr(dirattr_ret, &dirattr); error = 0; goto nfsmout; } nfsm_srvfhtom(fhp, v3); if (v3) { nfsm_srvpostop_attr(0, vap); nfsm_srvpostop_attr(dirattr_ret, &dirattr); } else { fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR); nfsm_srvfillattr(vap, fp); } nfsmout: if (ndp->ni_vp || dirp || ndp->ni_startdir) { if (ndp->ni_vp) vput(ndp->ni_vp); if (dirp) vrele(dirp); if (ndp->ni_startdir) vrele(ndp->ni_startdir); } NDFREE(&nd, NDF_ONLY_PNBUF); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * nfs readlink service */ int nfsrv_readlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN]; struct iovec *ivp = iv; struct mbuf *mp; u_int32_t *tl; caddr_t bpos; int error = 0, rdonly, i, tlen, len, getret; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mp3, *nmp, *mreq; struct vnode *vp = NULL; struct vattr attr; nfsfh_t nfh; fhandle_t *fhp; struct uio io, *uiop = &io; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; #ifndef nolint mp = NULL; #endif mp3 = NULL; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); len = 0; i = 0; while (len < NFS_MAXPATHLEN) { MGET(nmp, M_WAIT, MT_DATA); MCLGET(nmp, M_WAIT); nmp->m_len = NFSMSIZ(nmp); if (len == 0) mp3 = mp = nmp; else { mp->m_next = nmp; mp = nmp; } if ((len + mp->m_len) > NFS_MAXPATHLEN) { mp->m_len = NFS_MAXPATHLEN - len; len = NFS_MAXPATHLEN; } else len += mp->m_len; ivp->iov_base = mtod(mp, caddr_t); ivp->iov_len = mp->m_len; i++; ivp++; } uiop->uio_iov = iv; uiop->uio_iovcnt = i; uiop->uio_offset = 0; uiop->uio_resid = len; uiop->uio_rw = UIO_READ; uiop->uio_segflg = UIO_SYSSPACE; uiop->uio_td = NULL; error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (error) { nfsm_reply(2 * NFSX_UNSIGNED); if (v3) nfsm_srvpostop_attr(1, NULL); error = 0; goto nfsmout; } if (vp->v_type != VLNK) { if (v3) error = EINVAL; else error = ENXIO; } else error = VOP_READLINK(vp, uiop, cred); getret = VOP_GETATTR(vp, &attr, cred); vput(vp); vp = NULL; nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_UNSIGNED); if (v3) nfsm_srvpostop_attr(getret, &attr); if (error) { error = 0; goto nfsmout; } if (uiop->uio_resid > 0) { len -= uiop->uio_resid; tlen = nfsm_rndup(len); nfsm_adj(mp3, NFS_MAXPATHLEN-tlen, tlen-len); } tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); *tl = txdr_unsigned(len); mb->m_next = mp3; mp3 = NULL; nfsmout: if (mp3) m_freem(mp3); if (vp) vput(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs read service */ int nfsrv_read(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct iovec *iv; struct iovec *iv2; struct mbuf *m; struct nfs_fattr *fp; u_int32_t *tl; int i; caddr_t bpos; int error = 0, rdonly, cnt, len, left, siz, tlen, getret; int v3 = (nfsd->nd_flag & ND_NFSV3), reqlen; struct mbuf *mb, *mreq; struct mbuf *m2; struct vnode *vp = NULL; nfsfh_t nfh; fhandle_t *fhp; struct uio io, *uiop = &io; struct vattr va, *vap = &va; struct nfsheur *nh; off_t off; int ioflag = 0; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if (v3) { tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED); off = fxdr_hyper(tl); } else { tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED); off = (off_t)fxdr_unsigned(u_int32_t, *tl); } nfsm_srvstrsiz(reqlen, NFS_SRVMAXDATA(nfsd)); /* * Reference vp. If an error occurs, vp will be invalid, but we * have to NULL it just in case. The macros might goto nfsmout * as well. */ error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (error) { vp = NULL; nfsm_reply(2 * NFSX_UNSIGNED); if (v3) nfsm_srvpostop_attr(1, NULL); error = 0; goto nfsmout; } if (vp->v_type != VREG) { if (v3) error = EINVAL; else error = (vp->v_type == VDIR) ? EISDIR : EACCES; } if (!error) { if ((error = nfsrv_access(vp, VREAD, cred, rdonly, 1)) != 0) error = nfsrv_access(vp, VEXEC, cred, rdonly, 1); } getret = VOP_GETATTR(vp, vap, cred); if (!error) error = getret; if (error) { vput(vp); vp = NULL; nfsm_reply(NFSX_POSTOPATTR(v3)); if (v3) nfsm_srvpostop_attr(getret, vap); error = 0; goto nfsmout; } /* * Calculate byte count to read */ if (off >= vap->va_size) cnt = 0; else if ((off + reqlen) > vap->va_size) cnt = vap->va_size - off; else cnt = reqlen; /* * Calculate seqcount for heuristic */ { int hi; int try = 32; /* * Locate best candidate */ hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC; nh = &nfsheur[hi]; while (try--) { if (nfsheur[hi].nh_vp == vp) { nh = &nfsheur[hi]; break; } if (nfsheur[hi].nh_use > 0) --nfsheur[hi].nh_use; hi = (hi + 1) % NUM_HEURISTIC; if (nfsheur[hi].nh_use < nh->nh_use) nh = &nfsheur[hi]; } if (nh->nh_vp != vp) { nh->nh_vp = vp; nh->nh_nextr = off; nh->nh_use = NHUSE_INIT; if (off == 0) nh->nh_seqcount = 4; else nh->nh_seqcount = 1; } /* * Calculate heuristic */ if ((off == 0 && nh->nh_seqcount > 0) || off == nh->nh_nextr) { if (++nh->nh_seqcount > IO_SEQMAX) nh->nh_seqcount = IO_SEQMAX; } else if (nh->nh_seqcount > 1) { nh->nh_seqcount = 1; } else { nh->nh_seqcount = 0; } nh->nh_use += NHUSE_INC; if (nh->nh_use > NHUSE_MAX) nh->nh_use = NHUSE_MAX; ioflag |= nh->nh_seqcount << IO_SEQSHIFT; } nfsm_reply(NFSX_POSTOPORFATTR(v3) + 3 * NFSX_UNSIGNED+nfsm_rndup(cnt)); if (v3) { tl = nfsm_build(u_int32_t *, NFSX_V3FATTR + 4 * NFSX_UNSIGNED); *tl++ = nfsrv_nfs_true; fp = (struct nfs_fattr *)tl; tl += (NFSX_V3FATTR / sizeof (u_int32_t)); } else { tl = nfsm_build(u_int32_t *, NFSX_V2FATTR + NFSX_UNSIGNED); fp = (struct nfs_fattr *)tl; tl += (NFSX_V2FATTR / sizeof (u_int32_t)); } len = left = nfsm_rndup(cnt); if (cnt > 0) { /* * Generate the mbuf list with the uio_iov ref. to it. */ i = 0; m = m2 = mb; while (left > 0) { siz = min(M_TRAILINGSPACE(m), left); if (siz > 0) { left -= siz; i++; } if (left > 0) { MGET(m, M_WAIT, MT_DATA); MCLGET(m, M_WAIT); m->m_len = 0; m2->m_next = m; m2 = m; } } iv = malloc(i * sizeof (struct iovec), M_TEMP, M_WAITOK); uiop->uio_iov = iv2 = iv; m = mb; left = len; i = 0; while (left > 0) { if (m == NULL) panic("nfsrv_read iov"); siz = min(M_TRAILINGSPACE(m), left); if (siz > 0) { iv->iov_base = mtod(m, caddr_t) + m->m_len; iv->iov_len = siz; m->m_len += siz; left -= siz; iv++; i++; } m = m->m_next; } uiop->uio_iovcnt = i; uiop->uio_offset = off; uiop->uio_resid = len; uiop->uio_rw = UIO_READ; uiop->uio_segflg = UIO_SYSSPACE; error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred); off = uiop->uio_offset; nh->nh_nextr = off; free((caddr_t)iv2, M_TEMP); if (error || (getret = VOP_GETATTR(vp, vap, cred))) { if (!error) error = getret; m_freem(mreq); vput(vp); vp = NULL; nfsm_reply(NFSX_POSTOPATTR(v3)); if (v3) nfsm_srvpostop_attr(getret, vap); error = 0; goto nfsmout; } } else uiop->uio_resid = 0; vput(vp); vp = NULL; nfsm_srvfillattr(vap, fp); tlen = len - uiop->uio_resid; cnt = cnt < tlen ? cnt : tlen; tlen = nfsm_rndup(cnt); if (len != tlen || tlen != cnt) nfsm_adj(mb, len - tlen, tlen - cnt); if (v3) { *tl++ = txdr_unsigned(cnt); if (cnt < reqlen) *tl++ = nfsrv_nfs_true; else *tl++ = nfsrv_nfs_false; } *tl = txdr_unsigned(cnt); nfsmout: if (vp) vput(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs write service */ int nfsrv_write(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct iovec *ivp; int i, cnt; struct mbuf *mp; struct nfs_fattr *fp; struct iovec *iv; struct vattr va, forat; struct vattr *vap = &va; u_int32_t *tl; caddr_t bpos; int error = 0, rdonly, len, forat_ret = 1; int ioflags, aftat_ret = 1, retlen = 0, zeroing, adjust; int stable = NFSV3WRITE_FILESYNC; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct vnode *vp = NULL; nfsfh_t nfh; fhandle_t *fhp; struct uio io, *uiop = &io; off_t off; struct mount *mntp = NULL; int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; if (mrep == NULL) { *mrq = NULL; error = 0; goto nfsmout; } fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mntp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto ereply; } vfslocked = VFS_LOCK_GIANT(mntp); (void) vn_start_write(NULL, &mntp, V_WAIT); vfs_rel(mntp); /* The write holds a ref. */ if (v3) { tl = nfsm_dissect_nonblock(u_int32_t *, 5 * NFSX_UNSIGNED); off = fxdr_hyper(tl); tl += 3; stable = fxdr_unsigned(int, *tl++); } else { tl = nfsm_dissect_nonblock(u_int32_t *, 4 * NFSX_UNSIGNED); off = (off_t)fxdr_unsigned(u_int32_t, *++tl); tl += 2; if (nfs_async) stable = NFSV3WRITE_UNSTABLE; } retlen = len = fxdr_unsigned(int32_t, *tl); cnt = i = 0; /* * For NFS Version 2, it is not obvious what a write of zero length * should do, but I might as well be consistent with Version 3, * which is to return ok so long as there are no permission problems. */ if (len > 0) { zeroing = 1; mp = mrep; while (mp) { if (mp == md) { zeroing = 0; adjust = dpos - mtod(mp, caddr_t); mp->m_len -= adjust; if (mp->m_len > 0 && adjust > 0) mp->m_data += adjust; } if (zeroing) mp->m_len = 0; else if (mp->m_len > 0) { i += mp->m_len; if (i > len) { mp->m_len -= (i - len); zeroing = 1; } if (mp->m_len > 0) cnt++; } mp = mp->m_next; } } if (len > NFS_MAXDATA || len < 0 || i < len) { error = EIO; nfsm_reply(2 * NFSX_UNSIGNED); if (v3) nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap); error = 0; goto nfsmout; } error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp, nam, &rdonly, TRUE); vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked); if (error) { vp = NULL; nfsm_reply(2 * NFSX_UNSIGNED); if (v3) nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap); error = 0; goto nfsmout; } if (v3) forat_ret = VOP_GETATTR(vp, &forat, cred); if (vp->v_type != VREG) { if (v3) error = EINVAL; else error = (vp->v_type == VDIR) ? EISDIR : EACCES; } if (!error) error = nfsrv_access(vp, VWRITE, cred, rdonly, 1); if (error) { vput(vp); vp = NULL; nfsm_reply(NFSX_WCCDATA(v3)); if (v3) nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap); error = 0; goto nfsmout; } if (len > 0) { ivp = malloc(cnt * sizeof (struct iovec), M_TEMP, M_WAITOK); uiop->uio_iov = iv = ivp; uiop->uio_iovcnt = cnt; mp = mrep; while (mp) { if (mp->m_len > 0) { ivp->iov_base = mtod(mp, caddr_t); ivp->iov_len = mp->m_len; ivp++; } mp = mp->m_next; } /* * XXX * The IO_METASYNC flag indicates that all metadata (and not just * enough to ensure data integrity) mus be written to stable storage * synchronously. * (IO_METASYNC is not yet implemented in 4.4BSD-Lite.) */ if (stable == NFSV3WRITE_UNSTABLE) ioflags = IO_NODELOCKED; else if (stable == NFSV3WRITE_DATASYNC) ioflags = (IO_SYNC | IO_NODELOCKED); else ioflags = (IO_METASYNC | IO_SYNC | IO_NODELOCKED); uiop->uio_resid = len; uiop->uio_rw = UIO_WRITE; uiop->uio_segflg = UIO_SYSSPACE; uiop->uio_td = NULL; uiop->uio_offset = off; error = VOP_WRITE(vp, uiop, ioflags, cred); /* Unlocked write. */ nfsrvstats.srvvop_writes++; free((caddr_t)iv, M_TEMP); } aftat_ret = VOP_GETATTR(vp, vap, cred); vput(vp); vp = NULL; if (!error) error = aftat_ret; ereply: nfsm_reply(NFSX_PREOPATTR(v3) + NFSX_POSTOPORFATTR(v3) + 2 * NFSX_UNSIGNED + NFSX_WRITEVERF(v3)); if (v3) { nfsm_srvwcc_data(forat_ret, &forat, aftat_ret, vap); if (error) { error = 0; goto nfsmout; } tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); *tl++ = txdr_unsigned(retlen); /* * If nfs_async is set, then pretend the write was FILESYNC. */ if (stable == NFSV3WRITE_UNSTABLE && !nfs_async) *tl++ = txdr_unsigned(stable); else *tl++ = txdr_unsigned(NFSV3WRITE_FILESYNC); /* * Actually, there is no need to txdr these fields, * but it may make the values more human readable, * for debugging purposes. */ if (nfsver.tv_sec == 0) nfsver = boottime; *tl++ = txdr_unsigned(nfsver.tv_sec); *tl = txdr_unsigned(nfsver.tv_usec); } else if (!error) { /* v2 non-error case. */ fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR); nfsm_srvfillattr(vap, fp); } error = 0; nfsmout: if (vp) vput(vp); vn_finished_write(mntp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs create service * now does a truncate to 0 length via. setattr if it already exists */ int nfsrv_create(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct nfs_fattr *fp; struct vattr va, dirfor, diraft; struct vattr *vap = &va; struct nfsv2_sattr *sp; u_int32_t *tl; struct nameidata nd; caddr_t bpos; int error = 0, rdev, len, tsize, dirfor_ret = 1, diraft_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3), how, exclusive_flag = 0; struct mbuf *mb, *mreq; struct vnode *dirp = NULL; nfsfh_t nfh; fhandle_t *fhp; u_quad_t tempsize; struct timespec cverf; struct mount *mp = NULL; int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; #ifndef nolint rdev = 0; #endif ndclear(&nd); fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto ereply; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvnamesiz(len); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = CREATE; nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | SAVESTART | MPSAFE; /* * Call namei and do initial cleanup to get a few things * out of the way. If we get an initial error we cleanup * and return here to avoid special-casing the invalid nd * structure through the rest of the case. dirp may be * set even if an error occurs, but the nd structure will not * be valid at all if an error occurs so we have to invalidate it * prior to calling nfsm_reply ( which might goto nfsmout ). */ error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirfor, &dirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); if (dirp && !v3) { vrele(dirp); dirp = NULL; } if (error) { nfsm_reply(NFSX_WCCDATA(v3)); if (v3) nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); error = 0; goto nfsmout; } /* * No error. Continue. State: * * startdir is valid ( we release this immediately ) * dirp may be valid * nd.ni_vp may be valid * nd.ni_dvp is valid * * The error state is set through the code and we may also do some * opportunistic releasing of vnodes to avoid holding locks through * NFS I/O. The cleanup at the end is a catch-all */ VATTR_NULL(vap); if (v3) { tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED); how = fxdr_unsigned(int, *tl); switch (how) { case NFSV3CREATE_GUARDED: if (nd.ni_vp) { error = EEXIST; break; } /* fall through */ case NFSV3CREATE_UNCHECKED: nfsm_srvsattr(vap); break; case NFSV3CREATE_EXCLUSIVE: tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_V3CREATEVERF); /* Unique bytes, endianness is not important. */ cverf.tv_sec = (int32_t)tl[0]; cverf.tv_nsec = tl[1]; exclusive_flag = 1; break; }; vap->va_type = VREG; } else { sp = nfsm_dissect_nonblock(struct nfsv2_sattr *, NFSX_V2SATTR); vap->va_type = IFTOVT(fxdr_unsigned(u_int32_t, sp->sa_mode)); if (vap->va_type == VNON) vap->va_type = VREG; vap->va_mode = nfstov_mode(sp->sa_mode); switch (vap->va_type) { case VREG: tsize = fxdr_unsigned(int32_t, sp->sa_size); if (tsize != -1) vap->va_size = (u_quad_t)tsize; break; case VCHR: case VBLK: case VFIFO: rdev = fxdr_unsigned(long, sp->sa_size); break; default: break; }; } /* * Iff doesn't exist, create it * otherwise just truncate to 0 length * should I set the mode too ? * * The only possible error we can have at this point is EEXIST. * nd.ni_vp will also be non-NULL in that case. */ if (nd.ni_vp == NULL) { if (vap->va_mode == (mode_t)VNOVAL) vap->va_mode = 0; if (vap->va_type == VREG || vap->va_type == VSOCK) { error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap); if (error) NDFREE(&nd, NDF_ONLY_PNBUF); else { if (exclusive_flag) { exclusive_flag = 0; VATTR_NULL(vap); vap->va_atime = cverf; error = VOP_SETATTR(nd.ni_vp, vap, cred); } } } else if (vap->va_type == VCHR || vap->va_type == VBLK || vap->va_type == VFIFO) { /* * NFSv2-specific code for creating device nodes * and fifos. * * Handle SysV FIFO node special cases. All other * devices require super user to access. */ if (vap->va_type == VCHR && rdev == 0xffffffff) vap->va_type = VFIFO; if (vap->va_type != VFIFO && (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) { goto ereply; } vap->va_rdev = rdev; error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap); if (error) { NDFREE(&nd, NDF_ONLY_PNBUF); goto ereply; } vput(nd.ni_vp); nd.ni_vp = NULL; /* * release dvp prior to lookup */ vput(nd.ni_dvp); nd.ni_dvp = NULL; /* * Setup for lookup. * * Even though LOCKPARENT was cleared, ni_dvp may * be garbage. */ nd.ni_cnd.cn_nameiop = LOOKUP; nd.ni_cnd.cn_flags &= ~(LOCKPARENT); nd.ni_cnd.cn_thread = curthread; nd.ni_cnd.cn_cred = cred; tvfslocked = VFS_LOCK_GIANT(nd.ni_startdir->v_mount); if (tvfslocked) nd.ni_cnd.cn_flags |= GIANTHELD; error = lookup(&nd); nd.ni_dvp = NULL; vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); nd.ni_cnd.cn_flags &= ~GIANTHELD; if (error) goto ereply; if (nd.ni_cnd.cn_flags & ISSYMLINK) { error = EINVAL; goto ereply; } } else { error = ENXIO; } } else { if (vap->va_size != -1) { error = nfsrv_access(nd.ni_vp, VWRITE, cred, (nd.ni_cnd.cn_flags & RDONLY), 0); if (!error) { tempsize = vap->va_size; VATTR_NULL(vap); vap->va_size = tempsize; error = VOP_SETATTR(nd.ni_vp, vap, cred); } } } if (!error) { bzero((caddr_t)fhp, sizeof(nfh)); fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid; error = VOP_VPTOFH(nd.ni_vp, &fhp->fh_fid); if (!error) error = VOP_GETATTR(nd.ni_vp, vap, cred); } if (v3) { if (exclusive_flag && !error && bcmp(&cverf, &vap->va_atime, sizeof (cverf))) error = EEXIST; if (dirp == nd.ni_dvp) diraft_ret = VOP_GETATTR(dirp, &diraft, cred); else { /* Drop the other locks to avoid deadlock. */ if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vput(nd.ni_vp); nd.ni_dvp = NULL; nd.ni_vp = NULL; vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY); diraft_ret = VOP_GETATTR(dirp, &diraft, cred); VOP_UNLOCK(dirp, 0); } } ereply: nfsm_reply(NFSX_SRVFH(v3) + NFSX_FATTR(v3) + NFSX_WCCDATA(v3)); if (v3) { if (!error) { nfsm_srvpostop_fh(fhp); nfsm_srvpostop_attr(0, vap); } nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); } else if (!error) { /* v2 non-error case. */ nfsm_srvfhtom(fhp, v3); fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR); nfsm_srvfillattr(vap, fp); } error = 0; nfsmout: if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vput(nd.ni_vp); if (nd.ni_startdir) { vrele(nd.ni_startdir); nd.ni_startdir = NULL; } if (dirp) vrele(dirp); NDFREE(&nd, NDF_ONLY_PNBUF); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * nfs v3 mknod service */ int nfsrv_mknod(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct vattr va, dirfor, diraft; struct vattr *vap = &va; struct thread *td = curthread; u_int32_t *tl; struct nameidata nd; caddr_t bpos; int error = 0, len, dirfor_ret = 1, diraft_ret = 1; u_int32_t major, minor; enum vtype vtyp; struct mbuf *mb, *mreq; struct vnode *vp, *dirp = NULL; nfsfh_t nfh; fhandle_t *fhp; struct mount *mp = NULL; int v3 = (nfsd->nd_flag & ND_NFSV3); int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; if (!v3) panic("nfsrv_mknod: v3 proc called on a v2 connection"); ndclear(&nd); fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto ereply; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvnamesiz(len); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = CREATE; nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | SAVESTART | MPSAFE; /* * Handle nfs_namei() call. If an error occurs, the nd structure * is not valid. However, nfsm_*() routines may still jump to * nfsmout. */ error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirfor, &dirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); if (error) { nfsm_reply(NFSX_WCCDATA(1)); nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); error = 0; goto nfsmout; } tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED); vtyp = nfsv3tov_type(*tl); if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) { error = NFSERR_BADTYPE; goto out; } VATTR_NULL(vap); nfsm_srvsattr(vap); if (vtyp == VCHR || vtyp == VBLK) { tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED); major = fxdr_unsigned(u_int32_t, *tl++); minor = fxdr_unsigned(u_int32_t, *tl); vap->va_rdev = makedev(major, minor); } /* * Iff doesn't exist, create it. */ if (nd.ni_vp) { error = EEXIST; goto out; } vap->va_type = vtyp; if (vap->va_mode == (mode_t)VNOVAL) vap->va_mode = 0; if (vtyp == VSOCK) { vrele(nd.ni_startdir); nd.ni_startdir = NULL; error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap); if (error) NDFREE(&nd, NDF_ONLY_PNBUF); } else { if (vtyp != VFIFO && (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) goto out; error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap); if (error) { NDFREE(&nd, NDF_ONLY_PNBUF); goto out; } vput(nd.ni_vp); nd.ni_vp = NULL; /* * Release dvp prior to lookup */ vput(nd.ni_dvp); nd.ni_dvp = NULL; nd.ni_cnd.cn_nameiop = LOOKUP; nd.ni_cnd.cn_flags &= ~(LOCKPARENT); nd.ni_cnd.cn_thread = td; nd.ni_cnd.cn_cred = td->td_ucred; tvfslocked = VFS_LOCK_GIANT(nd.ni_startdir->v_mount); if (tvfslocked) nd.ni_cnd.cn_flags |= GIANTHELD; error = lookup(&nd); nd.ni_dvp = NULL; vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); nd.ni_cnd.cn_flags &= ~GIANTHELD; if (error) goto out; if (nd.ni_cnd.cn_flags & ISSYMLINK) error = EINVAL; } /* * send response, cleanup, return. */ out: vp = nd.ni_vp; if (!error) { bzero((caddr_t)fhp, sizeof(nfh)); fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid; error = VOP_VPTOFH(vp, &fhp->fh_fid); if (!error) error = VOP_GETATTR(vp, vap, cred); } if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); nd.ni_dvp = NULL; } if (vp) { vput(vp); vp = NULL; nd.ni_vp = NULL; } if (nd.ni_startdir) { vrele(nd.ni_startdir); nd.ni_startdir = NULL; } NDFREE(&nd, NDF_ONLY_PNBUF); if (dirp) { vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY); diraft_ret = VOP_GETATTR(dirp, &diraft, cred); vput(dirp); } ereply: nfsm_reply(NFSX_SRVFH(1) + NFSX_POSTOPATTR(1) + NFSX_WCCDATA(1)); if (v3) { if (!error) { nfsm_srvpostop_fh(fhp); nfsm_srvpostop_attr(0, vap); } nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); } vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (0); nfsmout: if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vput(nd.ni_vp); if (dirp) vrele(dirp); if (nd.ni_startdir) vrele(nd.ni_startdir); NDFREE(&nd, NDF_ONLY_PNBUF); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * nfs remove service */ int nfsrv_remove(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct nameidata nd; caddr_t bpos; int error = 0, len, dirfor_ret = 1, diraft_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct vnode *dirp; struct vattr dirfor, diraft; nfsfh_t nfh; fhandle_t *fhp; struct mount *mp = NULL; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); ndclear(&nd); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto ereply; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvnamesiz(len); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = DELETE; nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | MPSAFE; error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirfor, &dirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); if (dirp && !v3) { vrele(dirp); dirp = NULL; } if (error == 0) { if (nd.ni_vp->v_type == VDIR) { error = EPERM; /* POSIX */ goto out; } /* * The root of a mounted filesystem cannot be deleted. */ if (nd.ni_vp->v_vflag & VV_ROOT) { error = EBUSY; goto out; } out: if (!error) { error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); NDFREE(&nd, NDF_ONLY_PNBUF); } } if (dirp && v3) { if (dirp == nd.ni_dvp) diraft_ret = VOP_GETATTR(dirp, &diraft, cred); else { /* Drop the other locks to avoid deadlock. */ if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vput(nd.ni_vp); nd.ni_dvp = NULL; nd.ni_vp = NULL; vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY); diraft_ret = VOP_GETATTR(dirp, &diraft, cred); VOP_UNLOCK(dirp, 0); } vrele(dirp); dirp = NULL; } ereply: nfsm_reply(NFSX_WCCDATA(v3)); if (v3) nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); error = 0; nfsmout: NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vput(nd.ni_vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs rename service */ int nfsrv_rename(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; caddr_t bpos; int error = 0, len, len2, fdirfor_ret = 1, fdiraft_ret = 1; int tdirfor_ret = 1, tdiraft_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct nameidata fromnd, tond; struct vnode *fvp, *tvp, *tdvp, *fdirp = NULL; struct vnode *tdirp = NULL; struct vattr fdirfor, fdiraft, tdirfor, tdiraft; nfsfh_t fnfh, tnfh; fhandle_t *ffhp, *tfhp; uid_t saved_uid; struct mount *mp = NULL; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; #ifndef nolint fvp = NULL; #endif ffhp = &fnfh.fh_generic; tfhp = &tnfh.fh_generic; /* * Clear fields incase goto nfsmout occurs from macro. */ ndclear(&fromnd); ndclear(&tond); nfsm_srvmtofh(ffhp); if ((mp = vfs_getvfs(&ffhp->fh_fsid)) == NULL) { error = ESTALE; goto out1; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvnamesiz(len); /* * Remember our original uid so that we can reset cr_uid before * the second nfs_namei() call, in case it is remapped. */ saved_uid = cred->cr_uid; fromnd.ni_cnd.cn_cred = cred; fromnd.ni_cnd.cn_nameiop = DELETE; fromnd.ni_cnd.cn_flags = WANTPARENT | SAVESTART | MPSAFE; error = nfs_namei(&fromnd, nfsd, ffhp, len, slp, nam, &md, &dpos, &fdirp, v3, &fdirfor, &fdirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &fromnd); if (fdirp && !v3) { vrele(fdirp); fdirp = NULL; } if (error) { nfsm_reply(2 * NFSX_WCCDATA(v3)); if (v3) { nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft); nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft); } error = 0; goto nfsmout; } fvp = fromnd.ni_vp; nfsm_srvmtofh(tfhp); nfsm_srvnamesiz(len2); cred->cr_uid = saved_uid; tond.ni_cnd.cn_cred = cred; tond.ni_cnd.cn_nameiop = RENAME; tond.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | MPSAFE; error = nfs_namei(&tond, nfsd, tfhp, len2, slp, nam, &md, &dpos, &tdirp, v3, &tdirfor, &tdirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &tond); if (tdirp && !v3) { vrele(tdirp); tdirp = NULL; } if (error) goto out1; tdvp = tond.ni_dvp; tvp = tond.ni_vp; if (tvp != NULL) { if (fvp->v_type == VDIR && tvp->v_type != VDIR) { if (v3) error = EEXIST; else error = EISDIR; goto out; } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { if (v3) error = EEXIST; else error = ENOTDIR; goto out; } if (tvp->v_type == VDIR && tvp->v_mountedhere) { if (v3) error = EXDEV; else error = ENOTEMPTY; goto out; } } if (fvp->v_type == VDIR && fvp->v_mountedhere) { if (v3) error = EXDEV; else error = ENOTEMPTY; goto out; } if (fvp->v_mount != tdvp->v_mount) { if (v3) error = EXDEV; else error = ENOTEMPTY; goto out; } if (fvp == tdvp) { if (v3) error = EINVAL; else error = ENOTEMPTY; } /* * If source is the same as the destination (that is the * same vnode with the same name in the same directory), * then there is nothing to do. */ if (fvp == tvp && fromnd.ni_dvp == tdvp && fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, fromnd.ni_cnd.cn_namelen)) error = -1; out: if (!error) { /* * The VOP_RENAME function releases all vnode references & * locks prior to returning so we need to clear the pointers * to bypass cleanup code later on. */ error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); fromnd.ni_dvp = NULL; fromnd.ni_vp = NULL; tond.ni_dvp = NULL; tond.ni_vp = NULL; if (error) { NDFREE(&fromnd, NDF_ONLY_PNBUF); NDFREE(&tond, NDF_ONLY_PNBUF); } } else { if (error == -1) error = 0; } /* fall through */ out1: nfsm_reply(2 * NFSX_WCCDATA(v3)); if (v3) { /* Release existing locks to prevent deadlock. */ if (tond.ni_dvp) { if (tond.ni_dvp == tond.ni_vp) vrele(tond.ni_dvp); else vput(tond.ni_dvp); } if (tond.ni_vp) vput(tond.ni_vp); tond.ni_dvp = NULL; tond.ni_vp = NULL; if (fdirp) { vn_lock(fdirp, LK_EXCLUSIVE | LK_RETRY); fdiraft_ret = VOP_GETATTR(fdirp, &fdiraft, cred); VOP_UNLOCK(fdirp, 0); } if (tdirp) { vn_lock(tdirp, LK_EXCLUSIVE | LK_RETRY); tdiraft_ret = VOP_GETATTR(tdirp, &tdiraft, cred); VOP_UNLOCK(tdirp, 0); } nfsm_srvwcc_data(fdirfor_ret, &fdirfor, fdiraft_ret, &fdiraft); nfsm_srvwcc_data(tdirfor_ret, &tdirfor, tdiraft_ret, &tdiraft); } error = 0; /* fall through */ nfsmout: /* * Clear out tond related fields */ if (tond.ni_dvp) { if (tond.ni_dvp == tond.ni_vp) vrele(tond.ni_dvp); else vput(tond.ni_dvp); } if (tond.ni_vp) vput(tond.ni_vp); if (tdirp) vrele(tdirp); if (tond.ni_startdir) vrele(tond.ni_startdir); NDFREE(&tond, NDF_ONLY_PNBUF); /* * Clear out fromnd related fields */ if (fdirp) vrele(fdirp); if (fromnd.ni_startdir) vrele(fromnd.ni_startdir); NDFREE(&fromnd, NDF_ONLY_PNBUF); if (fromnd.ni_dvp) vrele(fromnd.ni_dvp); if (fromnd.ni_vp) vrele(fromnd.ni_vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * nfs link service */ int nfsrv_link(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct nameidata nd; caddr_t bpos; int error = 0, rdonly, len, dirfor_ret = 1, diraft_ret = 1; int getret = 1, v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct vnode *vp = NULL, *xp, *dirp = NULL; struct vattr dirfor, diraft, at; nfsfh_t nfh, dnfh; fhandle_t *fhp, *dfhp; struct mount *mp = NULL; int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); ndclear(&nd); vfslocked = 0; fhp = &nfh.fh_generic; dfhp = &dnfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto ereply; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvmtofh(dfhp); nfsm_srvnamesiz(len); error = nfsrv_fhtovp(fhp, TRUE, &vp, &tvfslocked, nfsd, slp, nam, &rdonly, TRUE); vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked); if (error) { nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3)); if (v3) { nfsm_srvpostop_attr(getret, &at); nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); } vp = NULL; error = 0; goto nfsmout; } if (v3) getret = VOP_GETATTR(vp, &at, cred); if (vp->v_type == VDIR) { error = EPERM; /* POSIX */ goto out1; } VOP_UNLOCK(vp, 0); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = CREATE; nd.ni_cnd.cn_flags = LOCKPARENT | MPSAFE | MPSAFE; error = nfs_namei(&nd, nfsd, dfhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirfor, &dirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); if (dirp && !v3) { vrele(dirp); dirp = NULL; } if (error) { vrele(vp); vp = NULL; goto out2; } xp = nd.ni_vp; if (xp != NULL) { error = EEXIST; vrele(vp); vp = NULL; goto out2; } xp = nd.ni_dvp; if (vp->v_mount != xp->v_mount) { error = EXDEV; vrele(vp); vp = NULL; goto out2; } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); NDFREE(&nd, NDF_ONLY_PNBUF); /* fall through */ out1: if (v3) getret = VOP_GETATTR(vp, &at, cred); out2: if (dirp) { if (dirp == nd.ni_dvp) diraft_ret = VOP_GETATTR(dirp, &diraft, cred); else { /* Release existing locks to prevent deadlock. */ if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vrele(nd.ni_vp); nd.ni_dvp = NULL; nd.ni_vp = NULL; vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY); diraft_ret = VOP_GETATTR(dirp, &diraft, cred); VOP_UNLOCK(dirp, 0); } } ereply: nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3)); if (v3) { nfsm_srvpostop_attr(getret, &at); nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); } error = 0; /* fall through */ nfsmout: NDFREE(&nd, NDF_ONLY_PNBUF); if (vp) vput(vp); if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (dirp) vrele(dirp); if (nd.ni_vp) vrele(nd.ni_vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs symbolic link service */ int nfsrv_symlink(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct vattr va, dirfor, diraft; struct nameidata nd; struct vattr *vap = &va; struct nfsv2_sattr *sp; char *bpos, *pathcp = NULL; struct uio io; struct iovec iv; int error = 0, len, len2, dirfor_ret = 1, diraft_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct vnode *dirp = NULL; nfsfh_t nfh; fhandle_t *fhp; struct mount *mp = NULL; int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); ndclear(&nd); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto out; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvnamesiz(len); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = CREATE; nd.ni_cnd.cn_flags = LOCKPARENT | SAVESTART | MPSAFE; error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirfor, &dirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); if (error == 0) { VATTR_NULL(vap); if (v3) nfsm_srvsattr(vap); nfsm_srvpathsiz(len2); } if (dirp && !v3) { vrele(dirp); dirp = NULL; } if (error) goto out; pathcp = malloc(len2 + 1, M_TEMP, M_WAITOK); iv.iov_base = pathcp; iv.iov_len = len2; io.uio_resid = len2; io.uio_offset = 0; io.uio_iov = &iv; io.uio_iovcnt = 1; io.uio_segflg = UIO_SYSSPACE; io.uio_rw = UIO_READ; io.uio_td = NULL; nfsm_mtouio(&io, len2); if (!v3) { sp = nfsm_dissect_nonblock(struct nfsv2_sattr *, NFSX_V2SATTR); vap->va_mode = nfstov_mode(sp->sa_mode); } *(pathcp + len2) = '\0'; if (nd.ni_vp) { error = EEXIST; goto out; } /* * issue symlink op. SAVESTART is set so the underlying path component * is only freed by the VOP if an error occurs. */ if (vap->va_mode == (mode_t)VNOVAL) vap->va_mode = 0; error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap, pathcp); if (error) NDFREE(&nd, NDF_ONLY_PNBUF); else vput(nd.ni_vp); nd.ni_vp = NULL; /* * releases directory prior to potential lookup op. */ vput(nd.ni_dvp); nd.ni_dvp = NULL; if (error == 0) { if (v3) { /* * Issue lookup. Leave SAVESTART set so we can easily free * the name buffer later on. * * since LOCKPARENT is not set, ni_dvp will be garbage on * return whether an error occurs or not. */ nd.ni_cnd.cn_nameiop = LOOKUP; nd.ni_cnd.cn_flags &= ~(LOCKPARENT | FOLLOW); nd.ni_cnd.cn_flags |= (NOFOLLOW | LOCKLEAF); nd.ni_cnd.cn_thread = curthread; nd.ni_cnd.cn_cred = cred; tvfslocked = VFS_LOCK_GIANT(nd.ni_startdir->v_mount); if (tvfslocked) nd.ni_cnd.cn_flags |= GIANTHELD; error = lookup(&nd); nd.ni_dvp = NULL; vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); nd.ni_cnd.cn_flags &= ~GIANTHELD; if (error == 0) { bzero((caddr_t)fhp, sizeof(nfh)); fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid; error = VOP_VPTOFH(nd.ni_vp, &fhp->fh_fid); if (!error) error = VOP_GETATTR(nd.ni_vp, vap, cred); vput(nd.ni_vp); nd.ni_vp = NULL; } } } out: /* * These releases aren't strictly required, does even doing them * make any sense? XXX can nfsm_reply() block? */ if (pathcp) { free(pathcp, M_TEMP); pathcp = NULL; } if (dirp) { vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY); diraft_ret = VOP_GETATTR(dirp, &diraft, cred); VOP_UNLOCK(dirp, 0); } if (nd.ni_startdir) { vrele(nd.ni_startdir); nd.ni_startdir = NULL; } nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3)); if (v3) { if (!error) { nfsm_srvpostop_fh(fhp); nfsm_srvpostop_attr(0, vap); } nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); } error = 0; /* fall through */ nfsmout: NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vrele(nd.ni_vp); if (nd.ni_startdir) vrele(nd.ni_startdir); if (dirp) vrele(dirp); if (pathcp) free(pathcp, M_TEMP); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * nfs mkdir service */ int nfsrv_mkdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct vattr va, dirfor, diraft; struct vattr *vap = &va; struct nfs_fattr *fp; struct nameidata nd; u_int32_t *tl; caddr_t bpos; int error = 0, len, dirfor_ret = 1, diraft_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct vnode *dirp = NULL; int vpexcl = 0; nfsfh_t nfh; fhandle_t *fhp; struct mount *mp = NULL; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); ndclear(&nd); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto out; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvnamesiz(len); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = CREATE; nd.ni_cnd.cn_flags = LOCKPARENT | MPSAFE; error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirfor, &dirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); if (dirp && !v3) { vrele(dirp); dirp = NULL; } if (error) { nfsm_reply(NFSX_WCCDATA(v3)); if (v3) nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); error = 0; goto nfsmout; } VATTR_NULL(vap); if (v3) { nfsm_srvsattr(vap); } else { tl = nfsm_dissect_nonblock(u_int32_t *, NFSX_UNSIGNED); vap->va_mode = nfstov_mode(*tl++); } /* * At this point nd.ni_dvp is referenced and exclusively locked and * nd.ni_vp, if it exists, is referenced but not locked. */ vap->va_type = VDIR; if (nd.ni_vp != NULL) { NDFREE(&nd, NDF_ONLY_PNBUF); error = EEXIST; goto out; } /* * Issue mkdir op. Since SAVESTART is not set, the pathname * component is freed by the VOP call. This will fill-in * nd.ni_vp, reference, and exclusively lock it. */ if (vap->va_mode == (mode_t)VNOVAL) vap->va_mode = 0; error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, vap); NDFREE(&nd, NDF_ONLY_PNBUF); vpexcl = 1; vput(nd.ni_dvp); nd.ni_dvp = NULL; if (!error) { bzero((caddr_t)fhp, sizeof(nfh)); fhp->fh_fsid = nd.ni_vp->v_mount->mnt_stat.f_fsid; error = VOP_VPTOFH(nd.ni_vp, &fhp->fh_fid); if (!error) error = VOP_GETATTR(nd.ni_vp, vap, cred); } out: if (dirp) { if (dirp == nd.ni_dvp) { diraft_ret = VOP_GETATTR(dirp, &diraft, cred); } else { /* Release existing locks to prevent deadlock. */ if (nd.ni_dvp) { NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_dvp == nd.ni_vp && vpexcl) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) { if (vpexcl) vput(nd.ni_vp); else vrele(nd.ni_vp); } nd.ni_dvp = NULL; nd.ni_vp = NULL; vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY); diraft_ret = VOP_GETATTR(dirp, &diraft, cred); VOP_UNLOCK(dirp, 0); } } nfsm_reply(NFSX_SRVFH(v3) + NFSX_POSTOPATTR(v3) + NFSX_WCCDATA(v3)); if (v3) { if (!error) { nfsm_srvpostop_fh(fhp); nfsm_srvpostop_attr(0, vap); } nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); } else if (!error) { /* v2 non-error case. */ nfsm_srvfhtom(fhp, v3); fp = nfsm_build(struct nfs_fattr *, NFSX_V2FATTR); nfsm_srvfillattr(vap, fp); } error = 0; /* fall through */ nfsmout: if (nd.ni_dvp) { NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_dvp == nd.ni_vp && vpexcl) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) { if (vpexcl) vput(nd.ni_vp); else vrele(nd.ni_vp); } if (dirp) vrele(dirp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * nfs rmdir service */ int nfsrv_rmdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; caddr_t bpos; int error = 0, len, dirfor_ret = 1, diraft_ret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct vnode *vp, *dirp = NULL; struct vattr dirfor, diraft; nfsfh_t nfh; fhandle_t *fhp; struct nameidata nd; struct mount *mp = NULL; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); ndclear(&nd); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto out; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ nfsm_srvnamesiz(len); nd.ni_cnd.cn_cred = cred; nd.ni_cnd.cn_nameiop = DELETE; nd.ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF | MPSAFE; error = nfs_namei(&nd, nfsd, fhp, len, slp, nam, &md, &dpos, &dirp, v3, &dirfor, &dirfor_ret, FALSE); vfslocked = nfsrv_lockedpair_nd(vfslocked, &nd); if (dirp && !v3) { vrele(dirp); dirp = NULL; } if (error) { nfsm_reply(NFSX_WCCDATA(v3)); if (v3) nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); error = 0; goto nfsmout; } vp = nd.ni_vp; if (vp->v_type != VDIR) { error = ENOTDIR; goto out; } /* * No rmdir "." please. */ if (nd.ni_dvp == vp) { error = EINVAL; goto out; } /* * The root of a mounted filesystem cannot be deleted. */ if (vp->v_vflag & VV_ROOT) error = EBUSY; out: /* * Issue or abort op. Since SAVESTART is not set, path name * component is freed by the VOP after either. */ if (!error) error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); NDFREE(&nd, NDF_ONLY_PNBUF); if (dirp) { if (dirp == nd.ni_dvp) diraft_ret = VOP_GETATTR(dirp, &diraft, cred); else { /* Release existing locks to prevent deadlock. */ if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vput(nd.ni_vp); nd.ni_dvp = NULL; nd.ni_vp = NULL; vn_lock(dirp, LK_EXCLUSIVE | LK_RETRY); diraft_ret = VOP_GETATTR(dirp, &diraft, cred); VOP_UNLOCK(dirp, 0); } } nfsm_reply(NFSX_WCCDATA(v3)); error = 0; if (v3) nfsm_srvwcc_data(dirfor_ret, &dirfor, diraft_ret, &diraft); /* fall through */ nfsmout: NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_dvp) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } if (nd.ni_vp) vput(nd.ni_vp); if (dirp) vrele(dirp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs readdir service * - mallocs what it thinks is enough to read * count rounded up to a multiple of NFS_DIRBLKSIZ <= NFS_MAXREADDIR * - calls VOP_READDIR() * - loops around building the reply * if the output generated exceeds count break out of loop * The nfsm_clget macro is used here so that the reply will be packed * tightly in mbuf clusters. * - it only knows that it has encountered eof when the VOP_READDIR() * reads nothing * - as such one readdir rpc will return eof false although you are there * and then the next will return eof * - it trims out records with d_fileno == 0 * this doesn't matter for Unix clients, but they might confuse clients * for other os'. * NB: It is tempting to set eof to true if the VOP_READDIR() reads less * than requested, but this may not apply to all filesystems. For * example, client NFS does not { although it is never remote mounted * anyhow } * The alternate call nfsrv_readdirplus() does lookups as well. * PS: The NFS protocol spec. does not clarify what the "count" byte * argument is a count of.. just name strings and file id's or the * entire reply rpc or ... * I tried just file name and id sizes and it confused the Sun client, * so I am using the full rpc size now. The "paranoia.." comment refers * to including the status longwords that are not a part of the dir. * "entry" structures, but are in the rpc. */ struct flrep { nfsuint64 fl_off; u_int32_t fl_postopok; u_int32_t fl_fattr[NFSX_V3FATTR / sizeof (u_int32_t)]; u_int32_t fl_fhok; u_int32_t fl_fhsize; u_int32_t fl_nfh[NFSX_V3FH / sizeof (u_int32_t)]; }; int nfsrv_readdir(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; char *bp, *be; struct mbuf *mp; struct dirent *dp; caddr_t cp; u_int32_t *tl; caddr_t bpos; struct mbuf *mb, *mreq; char *cpos, *cend, *rbuf; struct vnode *vp = NULL; struct vattr at; nfsfh_t nfh; fhandle_t *fhp; struct uio io; struct iovec iv; int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1; int siz, cnt, fullsiz, eofflag, rdonly, ncookies; int v3 = (nfsd->nd_flag & ND_NFSV3); u_quad_t off, toff, verf; u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */ int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if (v3) { tl = nfsm_dissect_nonblock(u_int32_t *, 5 * NFSX_UNSIGNED); toff = fxdr_hyper(tl); tl += 2; verf = fxdr_hyper(tl); tl += 2; } else { tl = nfsm_dissect_nonblock(u_int32_t *, 2 * NFSX_UNSIGNED); toff = fxdr_unsigned(u_quad_t, *tl++); verf = 0; /* shut up gcc */ } off = toff; cnt = fxdr_unsigned(int, *tl); siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1)); xfer = NFS_SRVMAXDATA(nfsd); if (cnt > xfer) cnt = xfer; if (siz > xfer) siz = xfer; fullsiz = siz; error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (!error && vp->v_type != VDIR) { error = ENOTDIR; vput(vp); vp = NULL; } if (error) { nfsm_reply(NFSX_UNSIGNED); if (v3) nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } /* * Obtain lock on vnode for this section of the code */ if (v3) { error = getret = VOP_GETATTR(vp, &at, cred); #if 0 /* * XXX This check may be too strict for Solaris 2.5 clients. */ if (!error && toff && verf && verf != at.va_filerev) error = NFSERR_BAD_COOKIE; #endif } if (!error) error = nfsrv_access(vp, VEXEC, cred, rdonly, 0); if (error) { vput(vp); vp = NULL; nfsm_reply(NFSX_POSTOPATTR(v3)); if (v3) nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } VOP_UNLOCK(vp, 0); /* * end section. Allocate rbuf and continue */ rbuf = malloc(siz, M_TEMP, M_WAITOK); again: iv.iov_base = rbuf; iv.iov_len = fullsiz; io.uio_iov = &iv; io.uio_iovcnt = 1; io.uio_offset = (off_t)off; io.uio_resid = fullsiz; io.uio_segflg = UIO_SYSSPACE; io.uio_rw = UIO_READ; io.uio_td = NULL; eofflag = 0; vn_lock(vp, LK_SHARED | LK_RETRY); if (cookies) { free((caddr_t)cookies, M_TEMP); cookies = NULL; } error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies); off = (off_t)io.uio_offset; if (!cookies && !error) error = NFSERR_PERM; if (v3) { getret = VOP_GETATTR(vp, &at, cred); if (!error) error = getret; } VOP_UNLOCK(vp, 0); if (error) { vrele(vp); vp = NULL; free((caddr_t)rbuf, M_TEMP); if (cookies) free((caddr_t)cookies, M_TEMP); nfsm_reply(NFSX_POSTOPATTR(v3)); if (v3) nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } if (io.uio_resid) { siz -= io.uio_resid; /* * If nothing read, return eof * rpc reply */ if (siz == 0) { vrele(vp); vp = NULL; nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) + 2 * NFSX_UNSIGNED); if (v3) { nfsm_srvpostop_attr(getret, &at); tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); txdr_hyper(at.va_filerev, tl); tl += 2; } else tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); *tl++ = nfsrv_nfs_false; *tl = nfsrv_nfs_true; free((caddr_t)rbuf, M_TEMP); free((caddr_t)cookies, M_TEMP); error = 0; goto nfsmout; } } /* * Check for degenerate cases of nothing useful read. * If so go try again */ cpos = rbuf; cend = rbuf + siz; dp = (struct dirent *)cpos; cookiep = cookies; /* * For some reason FreeBSD's ufs_readdir() chooses to back the * directory offset up to a block boundary, so it is necessary to * skip over the records that precede the requested offset. This * requires the assumption that file offset cookies monotonically * increase. */ while (cpos < cend && ncookies > 0 && (dp->d_fileno == 0 || dp->d_type == DT_WHT || ((u_quad_t)(*cookiep)) <= toff)) { cpos += dp->d_reclen; dp = (struct dirent *)cpos; cookiep++; ncookies--; } if (cpos >= cend || ncookies == 0) { toff = off; siz = fullsiz; goto again; } len = 3 * NFSX_UNSIGNED; /* paranoia, probably can be 0 */ nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_COOKIEVERF(v3) + siz); if (v3) { nfsm_srvpostop_attr(getret, &at); tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); txdr_hyper(at.va_filerev, tl); } mp = mb; bp = bpos; be = bp + M_TRAILINGSPACE(mp); /* Loop through the records and build reply */ while (cpos < cend && ncookies > 0) { if (dp->d_fileno != 0 && dp->d_type != DT_WHT) { nlen = dp->d_namlen; rem = nfsm_rndup(nlen) - nlen; len += (4 * NFSX_UNSIGNED + nlen + rem); if (v3) len += 2 * NFSX_UNSIGNED; if (len > cnt) { eofflag = 0; break; } /* * Build the directory record xdr from * the dirent entry. */ nfsm_clget; *tl = nfsrv_nfs_true; bp += NFSX_UNSIGNED; if (v3) { nfsm_clget; *tl = 0; bp += NFSX_UNSIGNED; } nfsm_clget; *tl = txdr_unsigned(dp->d_fileno); bp += NFSX_UNSIGNED; nfsm_clget; *tl = txdr_unsigned(nlen); bp += NFSX_UNSIGNED; /* And loop around copying the name */ xfer = nlen; cp = dp->d_name; while (xfer > 0) { nfsm_clget; if ((bp+xfer) > be) tsiz = be-bp; else tsiz = xfer; bcopy(cp, bp, tsiz); bp += tsiz; xfer -= tsiz; if (xfer > 0) cp += tsiz; } /* And null pad to an int32_t boundary. */ for (i = 0; i < rem; i++) *bp++ = '\0'; nfsm_clget; /* Finish off the record */ if (v3) { *tl = 0; bp += NFSX_UNSIGNED; nfsm_clget; } *tl = txdr_unsigned(*cookiep); bp += NFSX_UNSIGNED; } cpos += dp->d_reclen; dp = (struct dirent *)cpos; cookiep++; ncookies--; } vrele(vp); vp = NULL; nfsm_clget; *tl = nfsrv_nfs_false; bp += NFSX_UNSIGNED; nfsm_clget; if (eofflag) *tl = nfsrv_nfs_true; else *tl = nfsrv_nfs_false; bp += NFSX_UNSIGNED; if (mp != mb) { if (bp < be) mp->m_len = bp - mtod(mp, caddr_t); } else mp->m_len += bp - bpos; free((caddr_t)rbuf, M_TEMP); free((caddr_t)cookies, M_TEMP); nfsmout: if (vp) vrele(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } int nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; char *bp, *be; struct mbuf *mp; struct dirent *dp; caddr_t cp; u_int32_t *tl; caddr_t bpos; struct mbuf *mb, *mreq; char *cpos, *cend, *rbuf; struct vnode *vp = NULL, *nvp; struct flrep fl; nfsfh_t nfh; fhandle_t *fhp, *nfhp = (fhandle_t *)fl.fl_nfh; struct uio io; struct iovec iv; struct vattr va, at, *vap = &va; struct nfs_fattr *fp; int len, nlen, rem, xfer, tsiz, i, error = 0, getret = 1; int siz, cnt, fullsiz, eofflag, rdonly, dirlen, ncookies; u_quad_t off, toff, verf; u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */ int v3 = (nfsd->nd_flag & ND_NFSV3); int usevget = 1, vfslocked; struct componentname cn; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; if (!v3) panic("nfsrv_readdirplus: v3 proc called on a v2 connection"); fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); tl = nfsm_dissect_nonblock(u_int32_t *, 6 * NFSX_UNSIGNED); toff = fxdr_hyper(tl); tl += 2; verf = fxdr_hyper(tl); tl += 2; siz = fxdr_unsigned(int, *tl++); cnt = fxdr_unsigned(int, *tl); off = toff; siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1)); xfer = NFS_SRVMAXDATA(nfsd); if (cnt > xfer) cnt = xfer; if (siz > xfer) siz = xfer; fullsiz = siz; error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (!error && vp->v_type != VDIR) { error = ENOTDIR; vput(vp); vp = NULL; } if (error) { nfsm_reply(NFSX_UNSIGNED); nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } error = getret = VOP_GETATTR(vp, &at, cred); #if 0 /* * XXX This check may be too strict for Solaris 2.5 clients. */ if (!error && toff && verf && verf != at.va_filerev) error = NFSERR_BAD_COOKIE; #endif if (!error) error = nfsrv_access(vp, VEXEC, cred, rdonly, 0); if (error) { vput(vp); vp = NULL; nfsm_reply(NFSX_V3POSTOPATTR); nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } VOP_UNLOCK(vp, 0); rbuf = malloc(siz, M_TEMP, M_WAITOK); again: iv.iov_base = rbuf; iv.iov_len = fullsiz; io.uio_iov = &iv; io.uio_iovcnt = 1; io.uio_offset = (off_t)off; io.uio_resid = fullsiz; io.uio_segflg = UIO_SYSSPACE; io.uio_rw = UIO_READ; io.uio_td = NULL; eofflag = 0; vn_lock(vp, LK_SHARED | LK_RETRY); if (cookies) { free((caddr_t)cookies, M_TEMP); cookies = NULL; } error = VOP_READDIR(vp, &io, cred, &eofflag, &ncookies, &cookies); off = (u_quad_t)io.uio_offset; getret = VOP_GETATTR(vp, &at, cred); VOP_UNLOCK(vp, 0); if (!cookies && !error) error = NFSERR_PERM; if (!error) error = getret; if (error) { vrele(vp); vp = NULL; if (cookies) free((caddr_t)cookies, M_TEMP); free((caddr_t)rbuf, M_TEMP); nfsm_reply(NFSX_V3POSTOPATTR); nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } if (io.uio_resid) { siz -= io.uio_resid; /* * If nothing read, return eof * rpc reply */ if (siz == 0) { vrele(vp); vp = NULL; nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF + 2 * NFSX_UNSIGNED); nfsm_srvpostop_attr(getret, &at); tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); txdr_hyper(at.va_filerev, tl); tl += 2; *tl++ = nfsrv_nfs_false; *tl = nfsrv_nfs_true; free((caddr_t)cookies, M_TEMP); free((caddr_t)rbuf, M_TEMP); error = 0; goto nfsmout; } } /* * Check for degenerate cases of nothing useful read. * If so go try again */ cpos = rbuf; cend = rbuf + siz; dp = (struct dirent *)cpos; cookiep = cookies; /* * For some reason FreeBSD's ufs_readdir() chooses to back the * directory offset up to a block boundary, so it is necessary to * skip over the records that precede the requested offset. This * requires the assumption that file offset cookies monotonically * increase. */ while (cpos < cend && ncookies > 0 && (dp->d_fileno == 0 || dp->d_type == DT_WHT || ((u_quad_t)(*cookiep)) <= toff)) { cpos += dp->d_reclen; dp = (struct dirent *)cpos; cookiep++; ncookies--; } if (cpos >= cend || ncookies == 0) { toff = off; siz = fullsiz; goto again; } dirlen = len = NFSX_V3POSTOPATTR + NFSX_V3COOKIEVERF + 2 * NFSX_UNSIGNED; nfsm_reply(cnt); nfsm_srvpostop_attr(getret, &at); tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); txdr_hyper(at.va_filerev, tl); mp = mb; bp = bpos; be = bp + M_TRAILINGSPACE(mp); /* Loop through the records and build reply */ while (cpos < cend && ncookies > 0) { if (dp->d_fileno != 0 && dp->d_type != DT_WHT) { nlen = dp->d_namlen; rem = nfsm_rndup(nlen)-nlen; if (usevget) { /* * For readdir_and_lookup get the vnode using * the file number. */ error = VFS_VGET(vp->v_mount, dp->d_fileno, LK_SHARED, &nvp); if (error != 0 && error != EOPNOTSUPP) { error = 0; goto invalid; } else if (error == EOPNOTSUPP) { /* * VFS_VGET() not supported? * Let's switch to VOP_LOOKUP(). */ error = 0; usevget = 0; cn.cn_nameiop = LOOKUP; cn.cn_flags = ISLASTCN | NOFOLLOW | \ LOCKSHARED | LOCKLEAF | MPSAFE; cn.cn_lkflags = LK_SHARED | LK_RETRY; cn.cn_cred = cred; cn.cn_thread = curthread; } } if (!usevget) { cn.cn_nameptr = dp->d_name; cn.cn_namelen = dp->d_namlen; if (dp->d_namlen == 2 && dp->d_name[0] == '.' && dp->d_name[1] == '.') { cn.cn_flags |= ISDOTDOT; } else { cn.cn_flags &= ~ISDOTDOT; } if (!VOP_ISLOCKED(vp)) vn_lock(vp, LK_SHARED | LK_RETRY); if (VOP_LOOKUP(vp, &nvp, &cn) != 0) goto invalid; } bzero((caddr_t)nfhp, NFSX_V3FH); nfhp->fh_fsid = nvp->v_mount->mnt_stat.f_fsid; if (VOP_VPTOFH(nvp, &nfhp->fh_fid)) { vput(nvp); nvp = NULL; goto invalid; } if (VOP_GETATTR(nvp, vap, cred)) { vput(nvp); nvp = NULL; goto invalid; } vput(nvp); nvp = NULL; /* * If either the dircount or maxcount will be * exceeded, get out now. Both of these lengths * are calculated conservatively, including all * XDR overheads. */ len += (8 * NFSX_UNSIGNED + nlen + rem + NFSX_V3FH + NFSX_V3POSTOPATTR); dirlen += (6 * NFSX_UNSIGNED + nlen + rem); if (len > cnt || dirlen > fullsiz) { eofflag = 0; break; } /* * Build the directory record xdr from * the dirent entry. */ fp = (struct nfs_fattr *)&fl.fl_fattr; nfsm_srvfillattr(vap, fp); fl.fl_fhsize = txdr_unsigned(NFSX_V3FH); fl.fl_fhok = nfsrv_nfs_true; fl.fl_postopok = nfsrv_nfs_true; fl.fl_off.nfsuquad[0] = 0; fl.fl_off.nfsuquad[1] = txdr_unsigned(*cookiep); nfsm_clget; *tl = nfsrv_nfs_true; bp += NFSX_UNSIGNED; nfsm_clget; *tl = 0; bp += NFSX_UNSIGNED; nfsm_clget; *tl = txdr_unsigned(dp->d_fileno); bp += NFSX_UNSIGNED; nfsm_clget; *tl = txdr_unsigned(nlen); bp += NFSX_UNSIGNED; /* And loop around copying the name */ xfer = nlen; cp = dp->d_name; while (xfer > 0) { nfsm_clget; if ((bp + xfer) > be) tsiz = be - bp; else tsiz = xfer; bcopy(cp, bp, tsiz); bp += tsiz; xfer -= tsiz; if (xfer > 0) cp += tsiz; } /* And null pad to an int32_t boundary. */ for (i = 0; i < rem; i++) *bp++ = '\0'; /* * Now copy the flrep structure out. */ xfer = sizeof (struct flrep); cp = (caddr_t)&fl; while (xfer > 0) { nfsm_clget; if ((bp + xfer) > be) tsiz = be - bp; else tsiz = xfer; bcopy(cp, bp, tsiz); bp += tsiz; xfer -= tsiz; if (xfer > 0) cp += tsiz; } } invalid: cpos += dp->d_reclen; dp = (struct dirent *)cpos; cookiep++; ncookies--; } if (!usevget && VOP_ISLOCKED(vp)) vput(vp); else vrele(vp); vp = NULL; nfsm_clget; *tl = nfsrv_nfs_false; bp += NFSX_UNSIGNED; nfsm_clget; if (eofflag) *tl = nfsrv_nfs_true; else *tl = nfsrv_nfs_false; bp += NFSX_UNSIGNED; if (mp != mb) { if (bp < be) mp->m_len = bp - mtod(mp, caddr_t); } else mp->m_len += bp - bpos; free((caddr_t)cookies, M_TEMP); free((caddr_t)rbuf, M_TEMP); nfsmout: if (vp) vrele(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs commit service */ int nfsrv_commit(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct vattr bfor, aft; struct vnode *vp = NULL; nfsfh_t nfh; fhandle_t *fhp; u_int32_t *tl; caddr_t bpos; int error = 0, rdonly, for_ret = 1, aft_ret = 1, cnt; struct mbuf *mb, *mreq; u_quad_t off; struct mount *mp = NULL; int v3 = (nfsd->nd_flag & ND_NFSV3); int tvfslocked; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; if (!v3) panic("nfsrv_commit: v3 proc called on a v2 connection"); fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) { error = ESTALE; goto ereply; } vfslocked = VFS_LOCK_GIANT(mp); (void) vn_start_write(NULL, &mp, V_WAIT); vfs_rel(mp); /* The write holds a ref. */ tl = nfsm_dissect_nonblock(u_int32_t *, 3 * NFSX_UNSIGNED); /* * XXX At this time VOP_FSYNC() does not accept offset and byte * count parameters, so these arguments are useless (someday maybe). */ off = fxdr_hyper(tl); tl += 2; cnt = fxdr_unsigned(int, *tl); error = nfsrv_fhtovp(fhp, 1, &vp, &tvfslocked, nfsd, slp, nam, &rdonly, TRUE); vfslocked = nfsrv_lockedpair(vfslocked, tvfslocked); if (error) { nfsm_reply(2 * NFSX_UNSIGNED); nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft); error = 0; goto nfsmout; } for_ret = VOP_GETATTR(vp, &bfor, cred); if (cnt > MAX_COMMIT_COUNT) { /* * Give up and do the whole thing */ if (vp->v_object && (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) { VM_OBJECT_LOCK(vp->v_object); vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC); VM_OBJECT_UNLOCK(vp->v_object); } error = VOP_FSYNC(vp, MNT_WAIT, curthread); } else { /* * Locate and synchronously write any buffers that fall * into the requested range. Note: we are assuming that * f_iosize is a power of 2. */ int iosize = vp->v_mount->mnt_stat.f_iosize; int iomask = iosize - 1; struct bufobj *bo; daddr_t lblkno; /* * Align to iosize boundry, super-align to page boundry. */ if (off & iomask) { cnt += off & iomask; off &= ~(u_quad_t)iomask; } if (off & PAGE_MASK) { cnt += off & PAGE_MASK; off &= ~(u_quad_t)PAGE_MASK; } lblkno = off / iosize; if (vp->v_object && (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) { VM_OBJECT_LOCK(vp->v_object); vm_object_page_clean(vp->v_object, off / PAGE_SIZE, (cnt + PAGE_MASK) / PAGE_SIZE, OBJPC_SYNC); VM_OBJECT_UNLOCK(vp->v_object); } bo = &vp->v_bufobj; BO_LOCK(bo); while (cnt > 0) { struct buf *bp; /* * If we have a buffer and it is marked B_DELWRI we * have to lock and write it. Otherwise the prior * write is assumed to have already been committed. * * gbincore() can return invalid buffers now so we * have to check that bit as well (though B_DELWRI * should not be set if B_INVAL is set there could be * a race here since we haven't locked the buffer). */ if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) { if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, BO_MTX(bo)) == ENOLCK) { BO_LOCK(bo); continue; /* retry */ } if ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI) { bremfree(bp); bp->b_flags &= ~B_ASYNC; bwrite(bp); ++nfs_commit_miss; } else BUF_UNLOCK(bp); BO_LOCK(bo); } ++nfs_commit_blks; if (cnt < iosize) break; cnt -= iosize; ++lblkno; } BO_UNLOCK(bo); } aft_ret = VOP_GETATTR(vp, &aft, cred); vput(vp); vp = NULL; ereply: nfsm_reply(NFSX_V3WCCDATA + NFSX_V3WRITEVERF); nfsm_srvwcc_data(for_ret, &bfor, aft_ret, &aft); if (!error) { tl = nfsm_build(u_int32_t *, NFSX_V3WRITEVERF); if (nfsver.tv_sec == 0) nfsver = boottime; *tl++ = txdr_unsigned(nfsver.tv_sec); *tl = txdr_unsigned(nfsver.tv_usec); } else { error = 0; } nfsmout: if (vp) vput(vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs statfs service */ int nfsrv_statfs(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct statfs *sf; struct nfs_statfs *sfp; caddr_t bpos; int error = 0, rdonly, getret = 1; int v3 = (nfsd->nd_flag & ND_NFSV3); struct mbuf *mb, *mreq; struct vnode *vp = NULL; struct vattr at; nfsfh_t nfh; fhandle_t *fhp; struct statfs statfs; u_quad_t tval; int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (error) { nfsm_reply(NFSX_UNSIGNED); if (v3) nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } sf = &statfs; error = VFS_STATFS(vp->v_mount, sf); getret = VOP_GETATTR(vp, &at, cred); vput(vp); vp = NULL; nfsm_reply(NFSX_POSTOPATTR(v3) + NFSX_STATFS(v3)); if (v3) nfsm_srvpostop_attr(getret, &at); if (error) { error = 0; goto nfsmout; } sfp = nfsm_build(struct nfs_statfs *, NFSX_STATFS(v3)); if (v3) { tval = (u_quad_t)sf->f_blocks; tval *= (u_quad_t)sf->f_bsize; txdr_hyper(tval, &sfp->sf_tbytes); tval = (u_quad_t)sf->f_bfree; tval *= (u_quad_t)sf->f_bsize; txdr_hyper(tval, &sfp->sf_fbytes); /* * Don't send negative values for available space, * since this field is unsigned in the NFS protocol. * Otherwise, the client would see absurdly high * numbers for free space. */ if (sf->f_bavail < 0) tval = 0; else tval = (u_quad_t)sf->f_bavail; tval *= (u_quad_t)sf->f_bsize; txdr_hyper(tval, &sfp->sf_abytes); sfp->sf_tfiles.nfsuquad[0] = 0; sfp->sf_tfiles.nfsuquad[1] = txdr_unsigned(sf->f_files); sfp->sf_ffiles.nfsuquad[0] = 0; sfp->sf_ffiles.nfsuquad[1] = txdr_unsigned(sf->f_ffree); sfp->sf_afiles.nfsuquad[0] = 0; sfp->sf_afiles.nfsuquad[1] = txdr_unsigned(sf->f_ffree); sfp->sf_invarsec = 0; } else { sfp->sf_tsize = txdr_unsigned(NFS_MAXDGRAMDATA); sfp->sf_bsize = txdr_unsigned(sf->f_bsize); sfp->sf_blocks = txdr_unsigned(sf->f_blocks); sfp->sf_bfree = txdr_unsigned(sf->f_bfree); if (sf->f_bavail < 0) sfp->sf_bavail = 0; else sfp->sf_bavail = txdr_unsigned(sf->f_bavail); } nfsmout: if (vp) vput(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs fsinfo service */ int nfsrv_fsinfo(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct nfsv3_fsinfo *sip; caddr_t bpos; int error = 0, rdonly, getret = 1, pref; struct mbuf *mb, *mreq; struct vnode *vp = NULL; struct vattr at; nfsfh_t nfh; fhandle_t *fhp; u_quad_t maxfsize; struct statfs sb; int v3 = (nfsd->nd_flag & ND_NFSV3); int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); if (!v3) panic("nfsrv_fsinfo: v3 proc called on a v2 connection"); fhp = &nfh.fh_generic; vfslocked = 0; nfsm_srvmtofh(fhp); error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (error) { nfsm_reply(NFSX_UNSIGNED); nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } /* XXX Try to make a guess on the max file size. */ VFS_STATFS(vp->v_mount, &sb); maxfsize = (u_quad_t)0x80000000 * sb.f_bsize - 1; getret = VOP_GETATTR(vp, &at, cred); vput(vp); vp = NULL; nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3FSINFO); nfsm_srvpostop_attr(getret, &at); sip = nfsm_build(struct nfsv3_fsinfo *, NFSX_V3FSINFO); /* * XXX * There should be filesystem VFS OP(s) to get this information. * For now, assume ufs. */ pref = NFS_SRVMAXDATA(nfsd); sip->fs_rtmax = txdr_unsigned(pref); sip->fs_rtpref = txdr_unsigned(pref); sip->fs_rtmult = txdr_unsigned(NFS_FABLKSIZE); sip->fs_wtmax = txdr_unsigned(pref); sip->fs_wtpref = txdr_unsigned(pref); sip->fs_wtmult = txdr_unsigned(NFS_FABLKSIZE); sip->fs_dtpref = txdr_unsigned(pref); txdr_hyper(maxfsize, &sip->fs_maxfilesize); sip->fs_timedelta.nfsv3_sec = 0; sip->fs_timedelta.nfsv3_nsec = txdr_unsigned(1); sip->fs_properties = txdr_unsigned(NFSV3FSINFO_LINK | NFSV3FSINFO_SYMLINK | NFSV3FSINFO_HOMOGENEOUS | NFSV3FSINFO_CANSETTIME); nfsmout: if (vp) vput(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * nfs pathconf service */ int nfsrv_pathconf(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep, *md = nfsd->nd_md; struct sockaddr *nam = nfsd->nd_nam; caddr_t dpos = nfsd->nd_dpos; struct ucred *cred = nfsd->nd_cr; struct nfsv3_pathconf *pc; caddr_t bpos; int error = 0, rdonly, getret = 1; register_t linkmax, namemax, chownres, notrunc; struct mbuf *mb, *mreq; struct vnode *vp = NULL; struct vattr at; nfsfh_t nfh; fhandle_t *fhp; int v3 = (nfsd->nd_flag & ND_NFSV3); int vfslocked; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); if (!v3) panic("nfsrv_pathconf: v3 proc called on a v2 connection"); vfslocked = 0; fhp = &nfh.fh_generic; nfsm_srvmtofh(fhp); error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp, nam, &rdonly, TRUE); if (error) { nfsm_reply(NFSX_UNSIGNED); nfsm_srvpostop_attr(getret, &at); error = 0; goto nfsmout; } error = VOP_PATHCONF(vp, _PC_LINK_MAX, &linkmax); if (!error) error = VOP_PATHCONF(vp, _PC_NAME_MAX, &namemax); if (!error) error = VOP_PATHCONF(vp, _PC_CHOWN_RESTRICTED, &chownres); if (!error) error = VOP_PATHCONF(vp, _PC_NO_TRUNC, ¬runc); getret = VOP_GETATTR(vp, &at, cred); vput(vp); vp = NULL; nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3PATHCONF); nfsm_srvpostop_attr(getret, &at); if (error) { error = 0; goto nfsmout; } pc = nfsm_build(struct nfsv3_pathconf *, NFSX_V3PATHCONF); pc->pc_linkmax = txdr_unsigned(linkmax); pc->pc_namemax = txdr_unsigned(namemax); pc->pc_notrunc = txdr_unsigned(notrunc); pc->pc_chownrestricted = txdr_unsigned(chownres); /* * These should probably be supported by VOP_PATHCONF(), but * until msdosfs is exportable (why would you want to?), the * Unix defaults should be ok. */ pc->pc_caseinsensitive = nfsrv_nfs_false; pc->pc_casepreserving = nfsrv_nfs_true; nfsmout: if (vp) vput(vp); VFS_UNLOCK_GIANT(vfslocked); return(error); } /* * Null operation, used by clients to ping server */ /* ARGSUSED */ int nfsrv_null(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep; caddr_t bpos; int error = NFSERR_RETVOID; struct mbuf *mb, *mreq; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); nfsm_reply(0); nfsmout: return (error); } /* * No operation, used for obsolete procedures */ /* ARGSUSED */ int nfsrv_noop(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp, struct mbuf **mrq) { struct mbuf *mrep = nfsd->nd_mrep; caddr_t bpos; int error; struct mbuf *mb, *mreq; nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); if (nfsd->nd_repstat) error = nfsd->nd_repstat; else error = EPROCUNAVAIL; nfsm_reply(0); error = 0; nfsmout: return (error); } /* * Perform access checking for vnodes obtained from file handles that would * refer to files already opened by a Unix client. You cannot just use * vn_writechk() and VOP_ACCESS() for two reasons. * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write * case. * 2 - The owner is to be given access irrespective of mode bits for some * operations, so that processes that chmod after opening a file don't * break. I don't like this because it opens a security hole, but since * the nfs server opens a security hole the size of a barn door anyhow, * what the heck. * * The exception to rule 2 is EPERM. If a file is IMMUTABLE, VOP_ACCESS() * will return EPERM instead of EACCES. EPERM is always an error. */ static int nfsrv_access(struct vnode *vp, accmode_t accmode, struct ucred *cred, int rdonly, int override) { struct vattr vattr; int error; VFS_ASSERT_GIANT(vp->v_mount); nfsdbprintf(("%s %d\n", __FILE__, __LINE__)); if (accmode & VWRITE) { /* Just vn_writechk() changed to check rdonly */ /* * Disallow write attempts on read-only filesystems; * unless the file is a socket or a block or character * device resident on the filesystem. */ if (rdonly || (vp->v_mount->mnt_flag & MNT_RDONLY)) { switch (vp->v_type) { case VREG: case VDIR: case VLNK: return (EROFS); default: break; } } /* * If there's shared text associated with * the inode, we can't allow writing. */ if (vp->v_vflag & VV_TEXT) return (ETXTBSY); } error = VOP_GETATTR(vp, &vattr, cred); if (error) return (error); error = VOP_ACCESS(vp, accmode, cred, curthread); /* * Allow certain operations for the owner (reads and writes * on files that are already open). */ if (override && error == EACCES && cred->cr_uid == vattr.va_uid) error = 0; return (error); }