/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Rick Macklem at The University of Guelph. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 * $FreeBSD: src/sys/nfs/nfs_vnops.c,v 1.150.2.5 2001/12/20 19:56:28 dillon Exp $ * $DragonFly: src/sys/vfs/nfs/nfs_vnops.c,v 1.20 2004/04/08 22:32:14 dillon Exp $ */ /* * vnode op calls for Sun NFS version 2 and 3 */ #include "opt_inet.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "rpcv2.h" #include "nfsproto.h" #include "nfs.h" #include "nfsmount.h" #include "nfsnode.h" #include "xdr_subs.h" #include "nfsm_subs.h" #include "nqnfs.h" #include #include #include /* Defs */ #define TRUE 1 #define FALSE 0 /* * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these * calls are not in getblk() and brelse() so that they would not be necessary * here. */ #ifndef B_VMIO #define vfs_busy_pages(bp, f) #endif static int nfsspec_read (struct vop_read_args *); static int nfsspec_write (struct vop_write_args *); static int nfsfifo_read (struct vop_read_args *); static int nfsfifo_write (struct vop_write_args *); static int nfsspec_close (struct vop_close_args *); static int nfsfifo_close (struct vop_close_args *); #define nfs_poll vop_nopoll static int nfs_flush (struct vnode *,int,struct thread *,int); static int nfs_setattrrpc (struct vnode *,struct vattr *,struct ucred *,struct thread *); static int nfs_lookup (struct vop_lookup_args *); static int nfs_create (struct vop_create_args *); static int nfs_mknod (struct vop_mknod_args *); static int nfs_open (struct vop_open_args *); static int nfs_close (struct vop_close_args *); static int nfs_access (struct vop_access_args *); static int nfs_getattr (struct vop_getattr_args *); static int nfs_setattr (struct vop_setattr_args *); static int nfs_read (struct vop_read_args *); static int nfs_mmap (struct vop_mmap_args *); static int nfs_fsync (struct vop_fsync_args *); static int nfs_remove (struct vop_remove_args *); static int nfs_link (struct vop_link_args *); static int nfs_rename (struct vop_rename_args *); static int nfs_mkdir (struct vop_mkdir_args *); static int nfs_rmdir (struct vop_rmdir_args *); static int nfs_symlink (struct vop_symlink_args *); static int nfs_readdir (struct vop_readdir_args *); static int nfs_bmap (struct vop_bmap_args *); static int nfs_strategy (struct vop_strategy_args *); static int nfs_lookitup (struct vnode *, const char *, int, struct ucred *, struct thread *, struct nfsnode **); static int nfs_sillyrename (struct vnode *,struct vnode *,struct componentname *); static int nfsspec_access (struct vop_access_args *); static int nfs_readlink (struct vop_readlink_args *); static int nfs_print (struct vop_print_args *); static int nfs_advlock (struct vop_advlock_args *); static int nfs_bwrite (struct vop_bwrite_args *); /* * Global vfs data structures for nfs */ vop_t **nfsv2_vnodeop_p; static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { { &vop_default_desc, (vop_t *) vop_defaultop }, { &vop_access_desc, (vop_t *) nfs_access }, { &vop_advlock_desc, (vop_t *) nfs_advlock }, { &vop_bmap_desc, (vop_t *) nfs_bmap }, { &vop_bwrite_desc, (vop_t *) nfs_bwrite }, { &vop_close_desc, (vop_t *) nfs_close }, { &vop_create_desc, (vop_t *) nfs_create }, { &vop_fsync_desc, (vop_t *) nfs_fsync }, { &vop_getattr_desc, (vop_t *) nfs_getattr }, { &vop_getpages_desc, (vop_t *) nfs_getpages }, { &vop_putpages_desc, (vop_t *) nfs_putpages }, { &vop_inactive_desc, (vop_t *) nfs_inactive }, { &vop_islocked_desc, (vop_t *) vop_stdislocked }, { &vop_lease_desc, (vop_t *) vop_null }, { &vop_link_desc, (vop_t *) nfs_link }, { &vop_lock_desc, (vop_t *) vop_sharedlock }, { &vop_lookup_desc, (vop_t *) nfs_lookup }, { &vop_mkdir_desc, (vop_t *) nfs_mkdir }, { &vop_mknod_desc, (vop_t *) nfs_mknod }, { &vop_mmap_desc, (vop_t *) nfs_mmap }, { &vop_open_desc, (vop_t *) nfs_open }, { &vop_poll_desc, (vop_t *) nfs_poll }, { &vop_print_desc, (vop_t *) nfs_print }, { &vop_read_desc, (vop_t *) nfs_read }, { &vop_readdir_desc, (vop_t *) nfs_readdir }, { &vop_readlink_desc, (vop_t *) nfs_readlink }, { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, { &vop_remove_desc, (vop_t *) nfs_remove }, { &vop_rename_desc, (vop_t *) nfs_rename }, { &vop_rmdir_desc, (vop_t *) nfs_rmdir }, { &vop_setattr_desc, (vop_t *) nfs_setattr }, { &vop_strategy_desc, (vop_t *) nfs_strategy }, { &vop_symlink_desc, (vop_t *) nfs_symlink }, { &vop_unlock_desc, (vop_t *) vop_stdunlock }, { &vop_write_desc, (vop_t *) nfs_write }, { NULL, NULL } }; static struct vnodeopv_desc nfsv2_vnodeop_opv_desc = { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; VNODEOP_SET(nfsv2_vnodeop_opv_desc); /* * Special device vnode ops */ vop_t **spec_nfsv2nodeop_p; static struct vnodeopv_entry_desc nfsv2_specop_entries[] = { { &vop_default_desc, (vop_t *) spec_vnoperate }, { &vop_access_desc, (vop_t *) nfsspec_access }, { &vop_close_desc, (vop_t *) nfsspec_close }, { &vop_fsync_desc, (vop_t *) nfs_fsync }, { &vop_getattr_desc, (vop_t *) nfs_getattr }, { &vop_inactive_desc, (vop_t *) nfs_inactive }, { &vop_islocked_desc, (vop_t *) vop_stdislocked }, { &vop_lock_desc, (vop_t *) vop_sharedlock }, { &vop_print_desc, (vop_t *) nfs_print }, { &vop_read_desc, (vop_t *) nfsspec_read }, { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, { &vop_setattr_desc, (vop_t *) nfs_setattr }, { &vop_unlock_desc, (vop_t *) vop_stdunlock }, { &vop_write_desc, (vop_t *) nfsspec_write }, { NULL, NULL } }; static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = { &spec_nfsv2nodeop_p, nfsv2_specop_entries }; VNODEOP_SET(spec_nfsv2nodeop_opv_desc); vop_t **fifo_nfsv2nodeop_p; static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = { { &vop_default_desc, (vop_t *) fifo_vnoperate }, { &vop_access_desc, (vop_t *) nfsspec_access }, { &vop_close_desc, (vop_t *) nfsfifo_close }, { &vop_fsync_desc, (vop_t *) nfs_fsync }, { &vop_getattr_desc, (vop_t *) nfs_getattr }, { &vop_inactive_desc, (vop_t *) nfs_inactive }, { &vop_islocked_desc, (vop_t *) vop_stdislocked }, { &vop_lock_desc, (vop_t *) vop_sharedlock }, { &vop_print_desc, (vop_t *) nfs_print }, { &vop_read_desc, (vop_t *) nfsfifo_read }, { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, { &vop_setattr_desc, (vop_t *) nfs_setattr }, { &vop_unlock_desc, (vop_t *) vop_stdunlock }, { &vop_write_desc, (vop_t *) nfsfifo_write }, { NULL, NULL } }; static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = { &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries }; VNODEOP_SET(fifo_nfsv2nodeop_opv_desc); static int nfs_mknodrpc (struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap); static int nfs_removerpc (struct vnode *dvp, const char *name, int namelen, struct ucred *cred, struct thread *td); static int nfs_renamerpc (struct vnode *fdvp, const char *fnameptr, int fnamelen, struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, struct thread *td); static int nfs_renameit (struct vnode *sdvp, struct componentname *scnp, struct sillyrename *sp); /* * Global variables */ extern u_int32_t nfs_true, nfs_false; extern u_int32_t nfs_xdrneg1; extern struct nfsstats nfsstats; extern nfstype nfsv3_type[9]; struct thread *nfs_iodwant[NFS_MAXASYNCDAEMON]; struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; int nfs_numasync = 0; #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) SYSCTL_DECL(_vfs_nfs); static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); static int nfsneg_cache_timeout = NFS_MINATTRTIMO; SYSCTL_INT(_vfs_nfs, OID_AUTO, neg_cache_timeout, CTLFLAG_RW, &nfsneg_cache_timeout, 0, "NFS NEGATIVE ACCESS cache timeout"); static int nfsv3_commit_on_close = 0; SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); #if 0 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); #endif #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) static int nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, struct ucred *cred) { const int v3 = 1; u_int32_t *tl; int error = 0, attrflag; struct mbuf *mreq, *mrep, *md, *mb, *mb2; caddr_t bpos, dpos, cp2; int32_t t1, t2; caddr_t cp; u_int32_t rmode; struct nfsnode *np = VTONFS(vp); nfsstats.rpccnt[NFSPROC_ACCESS]++; nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); nfsm_fhtom(vp, v3); nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); *tl = txdr_unsigned(wmode); nfsm_request(vp, NFSPROC_ACCESS, td, cred); nfsm_postop_attr(vp, attrflag); if (!error) { nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); rmode = fxdr_unsigned(u_int32_t, *tl); np->n_mode = rmode; np->n_modeuid = cred->cr_uid; np->n_modestamp = mycpu->gd_time_seconds; } m_freem(mrep); nfsmout: return error; } /* * nfs access vnode op. * For nfs version 2, just return ok. File accesses may fail later. * For nfs version 3, use the access rpc to check accessibility. If file modes * are changed on the server, accesses might still fail later. */ static int nfs_access(ap) struct vop_access_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; int error = 0; u_int32_t mode, wmode; int v3 = NFS_ISV3(vp); struct nfsnode *np = VTONFS(vp); /* * Disallow write attempts on filesystems mounted read-only; * unless the file is a socket, fifo, or a block or character * device resident on the filesystem. */ if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { switch (vp->v_type) { case VREG: case VDIR: case VLNK: return (EROFS); default: break; } } /* * For nfs v3, check to see if we have done this recently, and if * so return our cached result instead of making an ACCESS call. * If not, do an access rpc, otherwise you are stuck emulating * ufs_access() locally using the vattr. This may not be correct, * since the server may apply other access criteria such as * client uid-->server uid mapping that we do not know about. */ if (v3) { if (ap->a_mode & VREAD) mode = NFSV3ACCESS_READ; else mode = 0; if (vp->v_type != VDIR) { if (ap->a_mode & VWRITE) mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); if (ap->a_mode & VEXEC) mode |= NFSV3ACCESS_EXECUTE; } else { if (ap->a_mode & VWRITE) mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | NFSV3ACCESS_DELETE); if (ap->a_mode & VEXEC) mode |= NFSV3ACCESS_LOOKUP; } /* XXX safety belt, only make blanket request if caching */ if (nfsaccess_cache_timeout > 0) { wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; } else { wmode = mode; } /* * Does our cached result allow us to give a definite yes to * this request? */ if ((mycpu->gd_time_seconds < (np->n_modestamp + nfsaccess_cache_timeout)) && (ap->a_cred->cr_uid == np->n_modeuid) && ((np->n_mode & mode) == mode)) { nfsstats.accesscache_hits++; } else { /* * Either a no, or a don't know. Go to the wire. */ nfsstats.accesscache_misses++; error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); if (!error) { if ((np->n_mode & mode) != mode) { error = EACCES; } } } } else { if ((error = nfsspec_access(ap)) != 0) return (error); /* * Attempt to prevent a mapped root from accessing a file * which it shouldn't. We try to read a byte from the file * if the user is root and the file is not zero length. * After calling nfsspec_access, we should have the correct * file size cached. */ if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) && VTONFS(vp)->n_size > 0) { struct iovec aiov; struct uio auio; char buf[1]; aiov.iov_base = buf; aiov.iov_len = 1; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; auio.uio_resid = 1; auio.uio_segflg = UIO_SYSSPACE; auio.uio_rw = UIO_READ; auio.uio_td = ap->a_td; if (vp->v_type == VREG) { error = nfs_readrpc(vp, &auio); } else if (vp->v_type == VDIR) { char* bp; bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); aiov.iov_base = bp; aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; error = nfs_readdirrpc(vp, &auio); free(bp, M_TEMP); } else if (vp->v_type == VLNK) { error = nfs_readlinkrpc(vp, &auio); } else { error = EACCES; } } } /* * [re]record creds for reading and/or writing if access * was granted. Assume the NFS server will grant read access * for execute requests. */ if (error == 0) { if ((ap->a_mode & (VREAD|VEXEC)) && ap->a_cred != np->n_rucred) { crhold(ap->a_cred); if (np->n_rucred) crfree(np->n_rucred); np->n_rucred = ap->a_cred; } if ((ap->a_mode & VWRITE) && ap->a_cred != np->n_wucred) { crhold(ap->a_cred); if (np->n_wucred) crfree(np->n_wucred); np->n_wucred = ap->a_cred; } } return(error); } /* * nfs open vnode op * Check to see if the type is ok * and that deletion is not in progress. * For paged in text files, you will need to flush the page cache * if consistency is lost. */ /* ARGSUSED */ static int nfs_open(ap) struct vop_open_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); struct nfsmount *nmp = VFSTONFS(vp->v_mount); struct vattr vattr; int error; if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { #ifdef DIAGNOSTIC printf("open eacces vtyp=%d\n",vp->v_type); #endif return (EOPNOTSUPP); } /* * Get a valid lease. If cached data is stale, flush it. */ if (nmp->nm_flag & NFSMNT_NQNFS) { if (NQNFS_CKINVALID(vp, np, ND_READ)) { do { error = nqnfs_getlease(vp, ND_READ, ap->a_td); } while (error == NQNFS_EXPIRED); if (error) return (error); if (np->n_lrev != np->n_brev || (np->n_flag & NQNFSNONCACHE)) { if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR) { return (error); } np->n_brev = np->n_lrev; } } } else { if (np->n_flag & NMODIFIED) { if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR) { return (error); } np->n_attrstamp = 0; if (vp->v_type == VDIR) np->n_direofoffset = 0; error = VOP_GETATTR(vp, &vattr, ap->a_td); if (error) return (error); np->n_mtime = vattr.va_mtime.tv_sec; } else { error = VOP_GETATTR(vp, &vattr, ap->a_td); if (error) return (error); if (np->n_mtime != vattr.va_mtime.tv_sec) { if (vp->v_type == VDIR) np->n_direofoffset = 0; if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR) { return (error); } np->n_mtime = vattr.va_mtime.tv_sec; } } } if ((nmp->nm_flag & NFSMNT_NQNFS) == 0) np->n_attrstamp = 0; /* For Open/Close consistency */ return (0); } /* * nfs close vnode op * What an NFS client should do upon close after writing is a debatable issue. * Most NFS clients push delayed writes to the server upon close, basically for * two reasons: * 1 - So that any write errors may be reported back to the client process * doing the close system call. By far the two most likely errors are * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. * 2 - To put a worst case upper bound on cache inconsistency between * multiple clients for the file. * There is also a consistency problem for Version 2 of the protocol w.r.t. * not being able to tell if other clients are writing a file concurrently, * since there is no way of knowing if the changed modify time in the reply * is only due to the write for this client. * (NFS Version 3 provides weak cache consistency data in the reply that * should be sufficient to detect and handle this case.) * * The current code does the following: * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers * for NFS Version 3 - flush dirty buffers to the server but don't invalidate * or commit them (this satisfies 1 and 2 except for the * case where the server crashes after this close but * before the commit RPC, which is felt to be "good * enough". Changing the last argument to nfs_flush() to * a 1 would force a commit operation, if it is felt a * commit is necessary now. * for NQNFS - do nothing now, since 2 is dealt with via leases and * 1 should be dealt with via an fsync() system call for * cases where write errors are important. */ /* ARGSUSED */ static int nfs_close(ap) struct vop_close_args /* { struct vnodeop_desc *a_desc; struct vnode *a_vp; int a_fflag; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); int error = 0; if (vp->v_type == VREG) { if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 && (np->n_flag & NMODIFIED)) { if (NFS_ISV3(vp)) { /* * Under NFSv3 we have dirty buffers to dispose of. We * must flush them to the NFS server. We have the option * of waiting all the way through the commit rpc or just * waiting for the initial write. The default is to only * wait through the initial write so the data is in the * server's cache, which is roughly similar to the state * a standard disk subsystem leaves the file in on close(). * * We cannot clear the NMODIFIED bit in np->n_flag due to * potential races with other processes, and certainly * cannot clear it if we don't commit. */ int cm = nfsv3_commit_on_close ? 1 : 0; error = nfs_flush(vp, MNT_WAIT, ap->a_td, cm); /* np->n_flag &= ~NMODIFIED; */ } else { error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); } np->n_attrstamp = 0; } if (np->n_flag & NWRITEERR) { np->n_flag &= ~NWRITEERR; error = np->n_error; } } return (error); } /* * nfs getattr call from vfs. */ static int nfs_getattr(ap) struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); caddr_t cp; u_int32_t *tl; int32_t t1, t2; caddr_t bpos, dpos; int error = 0; struct mbuf *mreq, *mrep, *md, *mb, *mb2; int v3 = NFS_ISV3(vp); /* * Update local times for special files. */ if (np->n_flag & (NACC | NUPD)) np->n_flag |= NCHG; /* * First look in the cache. */ if (nfs_getattrcache(vp, ap->a_vap) == 0) return (0); if (v3 && nfsaccess_cache_timeout > 0) { nfsstats.accesscache_misses++; nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, nfs_vpcred(vp, ND_CHECK)); if (nfs_getattrcache(vp, ap->a_vap) == 0) return (0); } nfsstats.rpccnt[NFSPROC_GETATTR]++; nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); nfsm_fhtom(vp, v3); nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, nfs_vpcred(vp, ND_CHECK)); if (!error) { nfsm_loadattr(vp, ap->a_vap); } m_freem(mrep); nfsmout: return (error); } /* * nfs setattr call. */ static int nfs_setattr(ap) struct vop_setattr_args /* { struct vnodeop_desc *a_desc; struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); struct vattr *vap = ap->a_vap; int error = 0; u_quad_t tsize; #ifndef nolint tsize = (u_quad_t)0; #endif /* * Setting of flags is not supported. */ if (vap->va_flags != VNOVAL) return (EOPNOTSUPP); /* * Disallow write attempts if the filesystem is mounted read-only. */ if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && (vp->v_mount->mnt_flag & MNT_RDONLY)) return (EROFS); if (vap->va_size != VNOVAL) { switch (vp->v_type) { case VDIR: return (EISDIR); case VCHR: case VBLK: case VSOCK: case VFIFO: if (vap->va_mtime.tv_sec == VNOVAL && vap->va_atime.tv_sec == VNOVAL && vap->va_mode == (mode_t)VNOVAL && vap->va_uid == (uid_t)VNOVAL && vap->va_gid == (gid_t)VNOVAL) return (0); vap->va_size = VNOVAL; break; default: /* * Disallow write attempts if the filesystem is * mounted read-only. */ if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EROFS); /* * We run vnode_pager_setsize() early (why?), * we must set np->n_size now to avoid vinvalbuf * V_SAVE races that might setsize a lower * value. */ tsize = np->n_size; error = nfs_meta_setsize(vp, ap->a_td, vap->va_size); if (np->n_flag & NMODIFIED) { if (vap->va_size == 0) error = nfs_vinvalbuf(vp, 0, ap->a_td, 1); else error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); if (error) { np->n_size = tsize; vnode_pager_setsize(vp, np->n_size); return (error); } } /* np->n_size has already been set to vap->va_size * in nfs_meta_setsize(). We must set it again since * nfs_loadattrcache() could be called through * nfs_meta_setsize() and could modify np->n_size. */ np->n_vattr.va_size = np->n_size = vap->va_size; }; } else if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && vp->v_type == VREG && (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR) return (error); error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); if (error && vap->va_size != VNOVAL) { np->n_size = np->n_vattr.va_size = tsize; vnode_pager_setsize(vp, np->n_size); } return (error); } /* * Do an nfs setattr rpc. */ static int nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred, struct thread *td) { struct nfsv2_sattr *sp; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; u_int32_t *tl; int error = 0, wccflag = NFSV3_WCCRATTR; struct mbuf *mreq, *mrep, *md, *mb, *mb2; int v3 = NFS_ISV3(vp); nfsstats.rpccnt[NFSPROC_SETATTR]++; nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); nfsm_fhtom(vp, v3); if (v3) { nfsm_v3attrbuild(vap, TRUE); nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); *tl = nfs_false; } else { nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); if (vap->va_mode == (mode_t)VNOVAL) sp->sa_mode = nfs_xdrneg1; else sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); if (vap->va_uid == (uid_t)VNOVAL) sp->sa_uid = nfs_xdrneg1; else sp->sa_uid = txdr_unsigned(vap->va_uid); if (vap->va_gid == (gid_t)VNOVAL) sp->sa_gid = nfs_xdrneg1; else sp->sa_gid = txdr_unsigned(vap->va_gid); sp->sa_size = txdr_unsigned(vap->va_size); txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); } nfsm_request(vp, NFSPROC_SETATTR, td, cred); if (v3) { nfsm_wcc_data(vp, wccflag); } else nfsm_loadattr(vp, (struct vattr *)0); m_freem(mrep); nfsmout: return (error); } /* * 'cached' nfs directory lookup */ static int nfs_lookup(ap) struct vop_lookup_args /* { struct vnodeop_desc *a_desc; struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; } */ *ap; { struct componentname *cnp = ap->a_cnp; struct vnode *dvp = ap->a_dvp; struct vnode **vpp = ap->a_vpp; int flags = cnp->cn_flags; struct vnode *newvp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; struct nfsmount *nmp; caddr_t bpos, dpos, cp2; struct mbuf *mreq, *mrep, *md, *mb, *mb2; long len; nfsfh_t *fhp; struct nfsnode *np; int lockparent, wantparent, error = 0, attrflag, fhsize; int v3 = NFS_ISV3(dvp); struct thread *td = cnp->cn_td; /* * Read-only mount check and directory check. */ *vpp = NULLVP; if ((flags & CNP_ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) return (EROFS); if (dvp->v_type != VDIR) return (ENOTDIR); /* * Look it up in the cache. Note that ENOENT is only returned if we * previously entered a negative hit (see later on). The additional * nfsneg_cache_timeout check causes previously cached results to * be instantly ignored if the negative caching is turned off. */ lockparent = flags & CNP_LOCKPARENT; wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); nmp = VFSTONFS(dvp->v_mount); np = VTONFS(dvp); error = cache_lookup(dvp, NCPNULL, vpp, NCPPNULL, cnp); if (error != 0) { struct vattr vattr; int vpid; if (error == ENOENT && nfsneg_cache_timeout) { *vpp = NULLVP; return (error); } if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { *vpp = NULLVP; return (error); } newvp = *vpp; vpid = newvp->v_id; /* * See the comment starting `Step through' in ufs/ufs_lookup.c * for an explanation of the locking protocol */ if (dvp == newvp) { VREF(newvp); error = 0; } else if (flags & CNP_ISDOTDOT) { VOP_UNLOCK(dvp, NULL, 0, td); error = vget(newvp, NULL, LK_EXCLUSIVE, td); if (!error && lockparent && (flags & CNP_ISLASTCN)) error = vn_lock(dvp, NULL, LK_EXCLUSIVE, td); } else { error = vget(newvp, NULL, LK_EXCLUSIVE, td); if (!lockparent || error || !(flags & CNP_ISLASTCN)) VOP_UNLOCK(dvp, NULL, 0, td); } if (!error) { if (vpid == newvp->v_id) { if (!VOP_GETATTR(newvp, &vattr, td) && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { nfsstats.lookupcache_hits++; if (cnp->cn_nameiop != NAMEI_LOOKUP && (flags & CNP_ISLASTCN)) cnp->cn_flags |= CNP_SAVENAME; return (0); } cache_purge(newvp); } vput(newvp); if (lockparent && dvp != newvp && (flags & CNP_ISLASTCN)) VOP_UNLOCK(dvp, NULL, 0, td); } error = vn_lock(dvp, NULL, LK_EXCLUSIVE, td); *vpp = NULLVP; if (error) return (error); } /* * Cache miss, go the wire. */ error = 0; newvp = NULLVP; nfsstats.lookupcache_misses++; nfsstats.rpccnt[NFSPROC_LOOKUP]++; len = cnp->cn_namelen; nfsm_reqhead(dvp, NFSPROC_LOOKUP, NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); nfsm_fhtom(dvp, v3); nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_td, cnp->cn_cred); if (error) { /* * Cache negatve lookups to reduce NFS traffic, but use * a fast timeout. */ if (error == ENOENT && (cnp->cn_flags & CNP_MAKEENTRY) && cnp->cn_nameiop == NAMEI_LOOKUP && nfsneg_cache_timeout) { int toval = nfsneg_cache_timeout * hz; if (cnp->cn_flags & CNP_CACHETIMEOUT) { if (cnp->cn_timeout > toval) cnp->cn_timeout = toval; } else { cnp->cn_flags |= CNP_CACHETIMEOUT; cnp->cn_timeout = toval; } cache_enter(dvp, NCPNULL, NULL, cnp); } nfsm_postop_attr(dvp, attrflag); m_freem(mrep); goto nfsmout; } nfsm_getfh(fhp, fhsize, v3); /* * Handle RENAME case... */ if (cnp->cn_nameiop == NAMEI_RENAME && wantparent && (flags & CNP_ISLASTCN)) { if (NFS_CMPFH(np, fhp, fhsize)) { m_freem(mrep); return (EISDIR); } error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); if (error) { m_freem(mrep); return (error); } newvp = NFSTOV(np); if (v3) { nfsm_postop_attr(newvp, attrflag); nfsm_postop_attr(dvp, attrflag); } else nfsm_loadattr(newvp, (struct vattr *)0); *vpp = newvp; m_freem(mrep); cnp->cn_flags |= CNP_SAVENAME; if (!lockparent) VOP_UNLOCK(dvp, NULL, 0, td); return (0); } if (flags & CNP_ISDOTDOT) { VOP_UNLOCK(dvp, NULL, 0, td); error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); if (error) { vn_lock(dvp, NULL, LK_EXCLUSIVE | LK_RETRY, td); return (error); } newvp = NFSTOV(np); if (lockparent && (flags & CNP_ISLASTCN) && (error = vn_lock(dvp, NULL, LK_EXCLUSIVE, td))) { vput(newvp); return (error); } } else if (NFS_CMPFH(np, fhp, fhsize)) { VREF(dvp); newvp = dvp; } else { error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); if (error) { m_freem(mrep); return (error); } if (!lockparent || !(flags & CNP_ISLASTCN)) VOP_UNLOCK(dvp, NULL, 0, td); newvp = NFSTOV(np); } if (v3) { nfsm_postop_attr(newvp, attrflag); nfsm_postop_attr(dvp, attrflag); } else nfsm_loadattr(newvp, (struct vattr *)0); if (cnp->cn_nameiop != NAMEI_LOOKUP && (flags & CNP_ISLASTCN)) cnp->cn_flags |= CNP_SAVENAME; if ((cnp->cn_flags & CNP_MAKEENTRY) && (cnp->cn_nameiop != NAMEI_DELETE || !(flags & CNP_ISLASTCN))) { np->n_ctime = np->n_vattr.va_ctime.tv_sec; cache_enter(dvp, NCPNULL, newvp, cnp); } *vpp = newvp; m_freem(mrep); nfsmout: if (error) { if (newvp != NULLVP) { vrele(newvp); *vpp = NULLVP; } if ((cnp->cn_nameiop == NAMEI_CREATE || cnp->cn_nameiop == NAMEI_RENAME) && (flags & CNP_ISLASTCN) && error == ENOENT) { if (!lockparent) VOP_UNLOCK(dvp, NULL, 0, td); if (dvp->v_mount->mnt_flag & MNT_RDONLY) error = EROFS; else error = EJUSTRETURN; } if (cnp->cn_nameiop != NAMEI_LOOKUP && (flags & CNP_ISLASTCN)) cnp->cn_flags |= CNP_SAVENAME; } return (error); } /* * nfs read call. * Just call nfs_bioread() to do the work. */ static int nfs_read(ap) struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { struct vnode *vp = ap->a_vp; return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); switch (vp->v_type) { case VREG: return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); case VDIR: return (EISDIR); default: return EOPNOTSUPP; } } /* * nfs readlink call */ static int nfs_readlink(ap) struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; } */ *ap; { struct vnode *vp = ap->a_vp; if (vp->v_type != VLNK) return (EINVAL); return (nfs_bioread(vp, ap->a_uio, 0)); } /* * Do a readlink rpc. * Called by nfs_doio() from below the buffer cache. */ int nfs_readlinkrpc(struct vnode *vp, struct uio *uiop) { u_int32_t *tl; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; int error = 0, len, attrflag; struct mbuf *mreq, *mrep, *md, *mb, *mb2; int v3 = NFS_ISV3(vp); nfsstats.rpccnt[NFSPROC_READLINK]++; nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); nfsm_fhtom(vp, v3); nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, nfs_vpcred(vp, ND_CHECK)); if (v3) nfsm_postop_attr(vp, attrflag); if (!error) { nfsm_strsiz(len, NFS_MAXPATHLEN); if (len == NFS_MAXPATHLEN) { struct nfsnode *np = VTONFS(vp); if (np->n_size && np->n_size < NFS_MAXPATHLEN) len = np->n_size; } nfsm_mtouio(uiop, len); } m_freem(mrep); nfsmout: return (error); } /* * nfs read rpc call * Ditto above */ int nfs_readrpc(struct vnode *vp, struct uio *uiop) { u_int32_t *tl; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; struct mbuf *mreq, *mrep, *md, *mb, *mb2; struct nfsmount *nmp; int error = 0, len, retlen, tsiz, eof, attrflag; int v3 = NFS_ISV3(vp); #ifndef nolint eof = 0; #endif nmp = VFSTONFS(vp->v_mount); tsiz = uiop->uio_resid; if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) return (EFBIG); while (tsiz > 0) { nfsstats.rpccnt[NFSPROC_READ]++; len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); nfsm_fhtom(vp, v3); nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); if (v3) { txdr_hyper(uiop->uio_offset, tl); *(tl + 2) = txdr_unsigned(len); } else { *tl++ = txdr_unsigned(uiop->uio_offset); *tl++ = txdr_unsigned(len); *tl = 0; } nfsm_request(vp, NFSPROC_READ, uiop->uio_td, nfs_vpcred(vp, ND_READ)); if (v3) { nfsm_postop_attr(vp, attrflag); if (error) { m_freem(mrep); goto nfsmout; } nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); eof = fxdr_unsigned(int, *(tl + 1)); } else nfsm_loadattr(vp, (struct vattr *)0); nfsm_strsiz(retlen, nmp->nm_rsize); nfsm_mtouio(uiop, retlen); m_freem(mrep); tsiz -= retlen; if (v3) { if (eof || retlen == 0) { tsiz = 0; } } else if (retlen < len) { tsiz = 0; } } nfsmout: return (error); } /* * nfs write call */ int nfs_writerpc(vp, uiop, iomode, must_commit) struct vnode *vp; struct uio *uiop; int *iomode, *must_commit; { u_int32_t *tl; caddr_t cp; int32_t t1, t2, backup; caddr_t bpos, dpos, cp2; struct mbuf *mreq, *mrep, *md, *mb, *mb2; struct nfsmount *nmp = VFSTONFS(vp->v_mount); int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; #ifndef DIAGNOSTIC if (uiop->uio_iovcnt != 1) panic("nfs: writerpc iovcnt > 1"); #endif *must_commit = 0; tsiz = uiop->uio_resid; if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) return (EFBIG); while (tsiz > 0) { nfsstats.rpccnt[NFSPROC_WRITE]++; len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; nfsm_reqhead(vp, NFSPROC_WRITE, NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); nfsm_fhtom(vp, v3); if (v3) { nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); txdr_hyper(uiop->uio_offset, tl); tl += 2; *tl++ = txdr_unsigned(len); *tl++ = txdr_unsigned(*iomode); *tl = txdr_unsigned(len); } else { u_int32_t x; nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); /* Set both "begin" and "current" to non-garbage. */ x = txdr_unsigned((u_int32_t)uiop->uio_offset); *tl++ = x; /* "begin offset" */ *tl++ = x; /* "current offset" */ x = txdr_unsigned(len); *tl++ = x; /* total to this offset */ *tl = x; /* size of this write */ } nfsm_uiotom(uiop, len); nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, nfs_vpcred(vp, ND_WRITE)); if (v3) { wccflag = NFSV3_WCCCHK; nfsm_wcc_data(vp, wccflag); if (!error) { nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED + NFSX_V3WRITEVERF); rlen = fxdr_unsigned(int, *tl++); if (rlen == 0) { error = NFSERR_IO; m_freem(mrep); break; } else if (rlen < len) { backup = len - rlen; uiop->uio_iov->iov_base -= backup; uiop->uio_iov->iov_len += backup; uiop->uio_offset -= backup; uiop->uio_resid += backup; len = rlen; } commit = fxdr_unsigned(int, *tl++); /* * Return the lowest committment level * obtained by any of the RPCs. */ if (committed == NFSV3WRITE_FILESYNC) committed = commit; else if (committed == NFSV3WRITE_DATASYNC && commit == NFSV3WRITE_UNSTABLE) committed = commit; if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF); nmp->nm_state |= NFSSTA_HASWRITEVERF; } else if (bcmp((caddr_t)tl, (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { *must_commit = 1; bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF); } } } else nfsm_loadattr(vp, (struct vattr *)0); if (wccflag) VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec; m_freem(mrep); if (error) break; tsiz -= len; } nfsmout: if (vp->v_mount->mnt_flag & MNT_ASYNC) committed = NFSV3WRITE_FILESYNC; *iomode = committed; if (error) uiop->uio_resid = tsiz; return (error); } /* * nfs mknod rpc * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the * mode set to specify the file type and the size field for rdev. */ static int nfs_mknodrpc(dvp, vpp, cnp, vap) struct vnode *dvp; struct vnode **vpp; struct componentname *cnp; struct vattr *vap; { struct nfsv2_sattr *sp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; struct vnode *newvp = (struct vnode *)0; struct nfsnode *np = (struct nfsnode *)0; struct vattr vattr; char *cp2; caddr_t bpos, dpos; int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; struct mbuf *mreq, *mrep, *md, *mb, *mb2; u_int32_t rdev; int v3 = NFS_ISV3(dvp); if (vap->va_type == VCHR || vap->va_type == VBLK) rdev = txdr_unsigned(vap->va_rdev); else if (vap->va_type == VFIFO || vap->va_type == VSOCK) rdev = nfs_xdrneg1; else { return (EOPNOTSUPP); } if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { return (error); } nfsstats.rpccnt[NFSPROC_MKNOD]++; nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); nfsm_fhtom(dvp, v3); nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); if (v3) { nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); *tl++ = vtonfsv3_type(vap->va_type); nfsm_v3attrbuild(vap, FALSE); if (vap->va_type == VCHR || vap->va_type == VBLK) { nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); *tl++ = txdr_unsigned(umajor(vap->va_rdev)); *tl = txdr_unsigned(uminor(vap->va_rdev)); } } else { nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); sp->sa_uid = nfs_xdrneg1; sp->sa_gid = nfs_xdrneg1; sp->sa_size = rdev; txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); } nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_td, cnp->cn_cred); if (!error) { nfsm_mtofh(dvp, newvp, v3, gotvp); if (!gotvp) { if (newvp) { vput(newvp); newvp = (struct vnode *)0; } error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); if (!error) newvp = NFSTOV(np); } } if (v3) nfsm_wcc_data(dvp, wccflag); m_freem(mrep); nfsmout: if (error) { if (newvp) vput(newvp); } else { if (cnp->cn_flags & CNP_MAKEENTRY) cache_enter(dvp, NCPNULL, newvp, cnp); *vpp = newvp; } VTONFS(dvp)->n_flag |= NMODIFIED; if (!wccflag) VTONFS(dvp)->n_attrstamp = 0; return (error); } /* * nfs mknod vop * just call nfs_mknodrpc() to do the work. */ /* ARGSUSED */ static int nfs_mknod(ap) struct vop_mknod_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; } */ *ap; { return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); } static u_long create_verf; /* * nfs file create call */ static int nfs_create(ap) struct vop_create_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; } */ *ap; { struct vnode *dvp = ap->a_dvp; struct vattr *vap = ap->a_vap; struct componentname *cnp = ap->a_cnp; struct nfsv2_sattr *sp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; struct nfsnode *np = (struct nfsnode *)0; struct vnode *newvp = (struct vnode *)0; caddr_t bpos, dpos, cp2; int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; struct mbuf *mreq, *mrep, *md, *mb, *mb2; struct vattr vattr; int v3 = NFS_ISV3(dvp); /* * Oops, not for me.. */ if (vap->va_type == VSOCK) return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { return (error); } if (vap->va_vaflags & VA_EXCLUSIVE) fmode |= O_EXCL; again: nfsstats.rpccnt[NFSPROC_CREATE]++; nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); nfsm_fhtom(dvp, v3); nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); if (v3) { nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); if (fmode & O_EXCL) { *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); #ifdef INET if (!TAILQ_EMPTY(&in_ifaddrhead)) *tl++ = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr.s_addr; else #endif *tl++ = create_verf; *tl = ++create_verf; } else { *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); nfsm_v3attrbuild(vap, FALSE); } } else { nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); sp->sa_uid = nfs_xdrneg1; sp->sa_gid = nfs_xdrneg1; sp->sa_size = 0; txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); } nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_td, cnp->cn_cred); if (!error) { nfsm_mtofh(dvp, newvp, v3, gotvp); if (!gotvp) { if (newvp) { vput(newvp); newvp = (struct vnode *)0; } error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); if (!error) newvp = NFSTOV(np); } } if (v3) nfsm_wcc_data(dvp, wccflag); m_freem(mrep); nfsmout: if (error) { if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { fmode &= ~O_EXCL; goto again; } if (newvp) vput(newvp); } else if (v3 && (fmode & O_EXCL)) { /* * We are normally called with only a partially initialized * VAP. Since the NFSv3 spec says that server may use the * file attributes to store the verifier, the spec requires * us to do a SETATTR RPC. FreeBSD servers store the verifier * in atime, but we can't really assume that all servers will * so we ensure that our SETATTR sets both atime and mtime. */ if (vap->va_mtime.tv_sec == VNOVAL) vfs_timestamp(&vap->va_mtime); if (vap->va_atime.tv_sec == VNOVAL) vap->va_atime = vap->va_mtime; error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); } if (!error) { if (cnp->cn_flags & CNP_MAKEENTRY) cache_enter(dvp, NCPNULL, newvp, cnp); /* * The new np may have enough info for access * checks, make sure rucred and wucred are * initialized for read and write rpc's. */ np = VTONFS(newvp); if (np->n_rucred == NULL) np->n_rucred = crhold(cnp->cn_cred); if (np->n_wucred == NULL) np->n_wucred = crhold(cnp->cn_cred); *ap->a_vpp = newvp; } VTONFS(dvp)->n_flag |= NMODIFIED; if (!wccflag) VTONFS(dvp)->n_attrstamp = 0; return (error); } /* * nfs file remove call * To try and make nfs semantics closer to ufs semantics, a file that has * other processes using the vnode is renamed instead of removed and then * removed later on the last close. * - If v_usecount > 1 * If a rename is not already in the works * call nfs_sillyrename() to set it up * else * do the remove rpc */ static int nfs_remove(ap) struct vop_remove_args /* { struct vnodeop_desc *a_desc; struct vnode * a_dvp; struct vnode * a_vp; struct componentname * a_cnp; } */ *ap; { struct vnode *vp = ap->a_vp; struct vnode *dvp = ap->a_dvp; struct componentname *cnp = ap->a_cnp; struct nfsnode *np = VTONFS(vp); int error = 0; struct vattr vattr; #ifndef DIAGNOSTIC if ((cnp->cn_flags & CNP_HASBUF) == 0) panic("nfs_remove: no name"); if (vp->v_usecount < 1) panic("nfs_remove: bad v_usecount"); #endif if (vp->v_type == VDIR) error = EPERM; else if (vp->v_usecount == 1 || (np->n_sillyrename && VOP_GETATTR(vp, &vattr, cnp->cn_td) == 0 && vattr.va_nlink > 1)) { /* * Purge the name cache so that the chance of a lookup for * the name succeeding while the remove is in progress is * minimized. Without node locking it can still happen, such * that an I/O op returns ESTALE, but since you get this if * another host removes the file.. */ cache_purge(vp); /* * throw away biocache buffers, mainly to avoid * unnecessary delayed writes later. */ error = nfs_vinvalbuf(vp, 0, cnp->cn_td, 1); /* Do the rpc */ if (error != EINTR) error = nfs_removerpc(dvp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); /* * Kludge City: If the first reply to the remove rpc is lost.. * the reply to the retransmitted request will be ENOENT * since the file was in fact removed * Therefore, we cheat and return success. */ if (error == ENOENT) error = 0; } else if (!np->n_sillyrename) error = nfs_sillyrename(dvp, vp, cnp); np->n_attrstamp = 0; return (error); } /* * nfs file remove rpc called from nfs_inactive */ int nfs_removeit(struct sillyrename *sp) { return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, NULL)); } /* * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). */ static int nfs_removerpc(dvp, name, namelen, cred, td) struct vnode *dvp; const char *name; int namelen; struct ucred *cred; struct thread *td; { u_int32_t *tl; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; int error = 0, wccflag = NFSV3_WCCRATTR; struct mbuf *mreq, *mrep, *md, *mb, *mb2; int v3 = NFS_ISV3(dvp); nfsstats.rpccnt[NFSPROC_REMOVE]++; nfsm_reqhead(dvp, NFSPROC_REMOVE, NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); nfsm_fhtom(dvp, v3); nfsm_strtom(name, namelen, NFS_MAXNAMLEN); nfsm_request(dvp, NFSPROC_REMOVE, td, cred); if (v3) nfsm_wcc_data(dvp, wccflag); m_freem(mrep); nfsmout: VTONFS(dvp)->n_flag |= NMODIFIED; if (!wccflag) VTONFS(dvp)->n_attrstamp = 0; return (error); } /* * nfs file rename call */ static int nfs_rename(ap) struct vop_rename_args /* { struct vnode *a_fdvp; struct vnode *a_fvp; struct componentname *a_fcnp; struct vnode *a_tdvp; struct vnode *a_tvp; struct componentname *a_tcnp; } */ *ap; { struct vnode *fvp = ap->a_fvp; struct vnode *tvp = ap->a_tvp; struct vnode *fdvp = ap->a_fdvp; struct vnode *tdvp = ap->a_tdvp; struct componentname *tcnp = ap->a_tcnp; struct componentname *fcnp = ap->a_fcnp; int error; #ifndef DIAGNOSTIC if ((tcnp->cn_flags & CNP_HASBUF) == 0 || (fcnp->cn_flags & CNP_HASBUF) == 0) panic("nfs_rename: no name"); #endif /* Check for cross-device rename */ if ((fvp->v_mount != tdvp->v_mount) || (tvp && (fvp->v_mount != tvp->v_mount))) { error = EXDEV; goto out; } /* * We have to flush B_DELWRI data prior to renaming * the file. If we don't, the delayed-write buffers * can be flushed out later after the file has gone stale * under NFSV3. NFSV2 does not have this problem because * ( as far as I can tell ) it flushes dirty buffers more * often. */ VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_td); if (tvp) VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_td); /* * If the tvp exists and is in use, sillyrename it before doing the * rename of the new file over it. * XXX Can't sillyrename a directory. */ if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { vput(tvp); tvp = NULL; } error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, tcnp->cn_td); if (fvp->v_type == VDIR) { if (tvp != NULL && tvp->v_type == VDIR) cache_purge(tdvp); cache_purge(fdvp); } out: if (tdvp == tvp) vrele(tdvp); else vput(tdvp); if (tvp) vput(tvp); vrele(fdvp); vrele(fvp); /* * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. */ if (error == ENOENT) error = 0; return (error); } /* * nfs file rename rpc called from nfs_remove() above */ static int nfs_renameit(sdvp, scnp, sp) struct vnode *sdvp; struct componentname *scnp; struct sillyrename *sp; { return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); } /* * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). */ static int nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, td) struct vnode *fdvp; const char *fnameptr; int fnamelen; struct vnode *tdvp; const char *tnameptr; int tnamelen; struct ucred *cred; struct thread *td; { u_int32_t *tl; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; struct mbuf *mreq, *mrep, *md, *mb, *mb2; int v3 = NFS_ISV3(fdvp); nfsstats.rpccnt[NFSPROC_RENAME]++; nfsm_reqhead(fdvp, NFSPROC_RENAME, (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + nfsm_rndup(tnamelen)); nfsm_fhtom(fdvp, v3); nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); nfsm_fhtom(tdvp, v3); nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); nfsm_request(fdvp, NFSPROC_RENAME, td, cred); if (v3) { nfsm_wcc_data(fdvp, fwccflag); nfsm_wcc_data(tdvp, twccflag); } m_freem(mrep); nfsmout: VTONFS(fdvp)->n_flag |= NMODIFIED; VTONFS(tdvp)->n_flag |= NMODIFIED; if (!fwccflag) VTONFS(fdvp)->n_attrstamp = 0; if (!twccflag) VTONFS(tdvp)->n_attrstamp = 0; return (error); } /* * nfs hard link create call */ static int nfs_link(ap) struct vop_link_args /* { struct vnode *a_tdvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap; { struct vnode *vp = ap->a_vp; struct vnode *tdvp = ap->a_tdvp; struct componentname *cnp = ap->a_cnp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; struct mbuf *mreq, *mrep, *md, *mb, *mb2; int v3; if (vp->v_mount != tdvp->v_mount) { return (EXDEV); } /* * Push all writes to the server, so that the attribute cache * doesn't get "out of sync" with the server. * XXX There should be a better way! */ VOP_FSYNC(vp, MNT_WAIT, cnp->cn_td); v3 = NFS_ISV3(vp); nfsstats.rpccnt[NFSPROC_LINK]++; nfsm_reqhead(vp, NFSPROC_LINK, NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); nfsm_fhtom(vp, v3); nfsm_fhtom(tdvp, v3); nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); nfsm_request(vp, NFSPROC_LINK, cnp->cn_td, cnp->cn_cred); if (v3) { nfsm_postop_attr(vp, attrflag); nfsm_wcc_data(tdvp, wccflag); } m_freem(mrep); nfsmout: VTONFS(tdvp)->n_flag |= NMODIFIED; if (!attrflag) VTONFS(vp)->n_attrstamp = 0; if (!wccflag) VTONFS(tdvp)->n_attrstamp = 0; /* * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. */ if (error == EEXIST) error = 0; return (error); } /* * nfs symbolic link create call */ static int nfs_symlink(ap) struct vop_symlink_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; char *a_target; } */ *ap; { struct vnode *dvp = ap->a_dvp; struct vattr *vap = ap->a_vap; struct componentname *cnp = ap->a_cnp; struct nfsv2_sattr *sp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; struct mbuf *mreq, *mrep, *md, *mb, *mb2; struct vnode *newvp = (struct vnode *)0; int v3 = NFS_ISV3(dvp); nfsstats.rpccnt[NFSPROC_SYMLINK]++; slen = strlen(ap->a_target); nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); nfsm_fhtom(dvp, v3); nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); if (v3) { nfsm_v3attrbuild(vap, FALSE); } nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); if (!v3) { nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); sp->sa_uid = nfs_xdrneg1; sp->sa_gid = nfs_xdrneg1; sp->sa_size = nfs_xdrneg1; txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); } /* * Issue the NFS request and get the rpc response. * * Only NFSv3 responses returning an error of 0 actually return * a file handle that can be converted into newvp without having * to do an extra lookup rpc. */ nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_td, cnp->cn_cred); if (v3) { if (error == 0) nfsm_mtofh(dvp, newvp, v3, gotvp); nfsm_wcc_data(dvp, wccflag); } /* * out code jumps -> here, mrep is also freed. */ m_freem(mrep); nfsmout: /* * If we get an EEXIST error, silently convert it to no-error * in case of an NFS retry. */ if (error == EEXIST) error = 0; /* * If we do not have (or no longer have) an error, and we could * not extract the newvp from the response due to the request being * NFSv2 or the error being EEXIST. We have to do a lookup in order * to obtain a newvp to return. */ if (error == 0 && newvp == NULL) { struct nfsnode *np = NULL; error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); if (!error) newvp = NFSTOV(np); } if (error) { if (newvp) vput(newvp); } else { *ap->a_vpp = newvp; } VTONFS(dvp)->n_flag |= NMODIFIED; if (!wccflag) VTONFS(dvp)->n_attrstamp = 0; return (error); } /* * nfs make dir call */ static int nfs_mkdir(ap) struct vop_mkdir_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; } */ *ap; { struct vnode *dvp = ap->a_dvp; struct vattr *vap = ap->a_vap; struct componentname *cnp = ap->a_cnp; struct nfsv2_sattr *sp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; int len; struct nfsnode *np = (struct nfsnode *)0; struct vnode *newvp = (struct vnode *)0; caddr_t bpos, dpos, cp2; int error = 0, wccflag = NFSV3_WCCRATTR; int gotvp = 0; struct mbuf *mreq, *mrep, *md, *mb, *mb2; struct vattr vattr; int v3 = NFS_ISV3(dvp); if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { return (error); } len = cnp->cn_namelen; nfsstats.rpccnt[NFSPROC_MKDIR]++; nfsm_reqhead(dvp, NFSPROC_MKDIR, NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); nfsm_fhtom(dvp, v3); nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); if (v3) { nfsm_v3attrbuild(vap, FALSE); } else { nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); sp->sa_uid = nfs_xdrneg1; sp->sa_gid = nfs_xdrneg1; sp->sa_size = nfs_xdrneg1; txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); } nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_td, cnp->cn_cred); if (!error) nfsm_mtofh(dvp, newvp, v3, gotvp); if (v3) nfsm_wcc_data(dvp, wccflag); m_freem(mrep); nfsmout: VTONFS(dvp)->n_flag |= NMODIFIED; if (!wccflag) VTONFS(dvp)->n_attrstamp = 0; /* * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry * if we can succeed in looking up the directory. */ if (error == EEXIST || (!error && !gotvp)) { if (newvp) { vrele(newvp); newvp = (struct vnode *)0; } error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, cnp->cn_td, &np); if (!error) { newvp = NFSTOV(np); if (newvp->v_type != VDIR) error = EEXIST; } } if (error) { if (newvp) vrele(newvp); } else *ap->a_vpp = newvp; return (error); } /* * nfs remove directory call */ static int nfs_rmdir(ap) struct vop_rmdir_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap; { struct vnode *vp = ap->a_vp; struct vnode *dvp = ap->a_dvp; struct componentname *cnp = ap->a_cnp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; caddr_t bpos, dpos, cp2; int error = 0, wccflag = NFSV3_WCCRATTR; struct mbuf *mreq, *mrep, *md, *mb, *mb2; int v3 = NFS_ISV3(dvp); if (dvp == vp) return (EINVAL); nfsstats.rpccnt[NFSPROC_RMDIR]++; nfsm_reqhead(dvp, NFSPROC_RMDIR, NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); nfsm_fhtom(dvp, v3); nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_td, cnp->cn_cred); if (v3) nfsm_wcc_data(dvp, wccflag); m_freem(mrep); nfsmout: VTONFS(dvp)->n_flag |= NMODIFIED; if (!wccflag) VTONFS(dvp)->n_attrstamp = 0; cache_purge(dvp); cache_purge(vp); /* * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. */ if (error == ENOENT) error = 0; return (error); } /* * nfs readdir call */ static int nfs_readdir(ap) struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); struct uio *uio = ap->a_uio; int tresid, error; struct vattr vattr; if (vp->v_type != VDIR) return (EPERM); /* * First, check for hit on the EOF offset cache */ if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && (np->n_flag & NMODIFIED) == 0) { if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) { if (NQNFS_CKCACHABLE(vp, ND_READ)) { nfsstats.direofcache_hits++; return (0); } } else if (VOP_GETATTR(vp, &vattr, uio->uio_td) == 0 && np->n_mtime == vattr.va_mtime.tv_sec) { nfsstats.direofcache_hits++; return (0); } } /* * Call nfs_bioread() to do the real work. */ tresid = uio->uio_resid; error = nfs_bioread(vp, uio, 0); if (!error && uio->uio_resid == tresid) nfsstats.direofcache_misses++; return (error); } /* * Readdir rpc call. * Called from below the buffer cache by nfs_doio(). */ int nfs_readdirrpc(struct vnode *vp, struct uio *uiop) { int len, left; struct dirent *dp = NULL; u_int32_t *tl; caddr_t cp; int32_t t1, t2; nfsuint64 *cookiep; caddr_t bpos, dpos, cp2; struct mbuf *mreq, *mrep, *md, *mb, *mb2; nfsuint64 cookie; struct nfsmount *nmp = VFSTONFS(vp->v_mount); struct nfsnode *dnp = VTONFS(vp); u_quad_t fileno; int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; int attrflag; int v3 = NFS_ISV3(vp); #ifndef DIAGNOSTIC if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || (uiop->uio_resid & (DIRBLKSIZ - 1))) panic("nfs readdirrpc bad uio"); #endif /* * If there is no cookie, assume directory was stale. */ cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); if (cookiep) cookie = *cookiep; else return (NFSERR_BAD_COOKIE); /* * Loop around doing readdir rpc's of size nm_readdirsize * truncated to a multiple of DIRBLKSIZ. * The stopping criteria is EOF or buffer full. */ while (more_dirs && bigenough) { nfsstats.rpccnt[NFSPROC_READDIR]++; nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + NFSX_READDIR(v3)); nfsm_fhtom(vp, v3); if (v3) { nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); *tl++ = cookie.nfsuquad[0]; *tl++ = cookie.nfsuquad[1]; *tl++ = dnp->n_cookieverf.nfsuquad[0]; *tl++ = dnp->n_cookieverf.nfsuquad[1]; } else { nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); *tl++ = cookie.nfsuquad[0]; } *tl = txdr_unsigned(nmp->nm_readdirsize); nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, nfs_vpcred(vp, ND_READ)); if (v3) { nfsm_postop_attr(vp, attrflag); if (!error) { nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); dnp->n_cookieverf.nfsuquad[0] = *tl++; dnp->n_cookieverf.nfsuquad[1] = *tl; } else { m_freem(mrep); goto nfsmout; } } nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); more_dirs = fxdr_unsigned(int, *tl); /* loop thru the dir entries, doctoring them to 4bsd form */ while (more_dirs && bigenough) { if (v3) { nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); fileno = fxdr_hyper(tl); len = fxdr_unsigned(int, *(tl + 2)); } else { nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); fileno = fxdr_unsigned(u_quad_t, *tl++); len = fxdr_unsigned(int, *tl); } if (len <= 0 || len > NFS_MAXNAMLEN) { error = EBADRPC; m_freem(mrep); goto nfsmout; } tlen = nfsm_rndup(len); if (tlen == len) tlen += 4; /* To ensure null termination */ left = DIRBLKSIZ - blksiz; if ((tlen + DIRHDSIZ) > left) { dp->d_reclen += left; uiop->uio_iov->iov_base += left; uiop->uio_iov->iov_len -= left; uiop->uio_offset += left; uiop->uio_resid -= left; blksiz = 0; } if ((tlen + DIRHDSIZ) > uiop->uio_resid) bigenough = 0; if (bigenough) { dp = (struct dirent *)uiop->uio_iov->iov_base; dp->d_fileno = (int)fileno; dp->d_namlen = len; dp->d_reclen = tlen + DIRHDSIZ; dp->d_type = DT_UNKNOWN; blksiz += dp->d_reclen; if (blksiz == DIRBLKSIZ) blksiz = 0; uiop->uio_offset += DIRHDSIZ; uiop->uio_resid -= DIRHDSIZ; uiop->uio_iov->iov_base += DIRHDSIZ; uiop->uio_iov->iov_len -= DIRHDSIZ; nfsm_mtouio(uiop, len); cp = uiop->uio_iov->iov_base; tlen -= len; *cp = '\0'; /* null terminate */ uiop->uio_iov->iov_base += tlen; uiop->uio_iov->iov_len -= tlen; uiop->uio_offset += tlen; uiop->uio_resid -= tlen; } else nfsm_adv(nfsm_rndup(len)); if (v3) { nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); } else { nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); } if (bigenough) { cookie.nfsuquad[0] = *tl++; if (v3) cookie.nfsuquad[1] = *tl++; } else if (v3) tl += 2; else tl++; more_dirs = fxdr_unsigned(int, *tl); } /* * If at end of rpc data, get the eof boolean */ if (!more_dirs) { nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); more_dirs = (fxdr_unsigned(int, *tl) == 0); } m_freem(mrep); } /* * Fill last record, iff any, out to a multiple of DIRBLKSIZ * by increasing d_reclen for the last record. */ if (blksiz > 0) { left = DIRBLKSIZ - blksiz; dp->d_reclen += left; uiop->uio_iov->iov_base += left; uiop->uio_iov->iov_len -= left; uiop->uio_offset += left; uiop->uio_resid -= left; } /* * We are now either at the end of the directory or have filled the * block. */ if (bigenough) dnp->n_direofoffset = uiop->uio_offset; else { if (uiop->uio_resid > 0) printf("EEK! readdirrpc resid > 0\n"); cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); *cookiep = cookie; } nfsmout: return (error); } /* * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). */ int nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) { int len, left; struct dirent *dp; u_int32_t *tl; caddr_t cp; int32_t t1, t2; struct vnode *newvp; nfsuint64 *cookiep; caddr_t bpos, dpos, cp2, dpossav1, dpossav2; struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; struct nameidata nami, *ndp = &nami; struct componentname *cnp = &ndp->ni_cnd; nfsuint64 cookie; struct nfsmount *nmp = VFSTONFS(vp->v_mount); struct nfsnode *dnp = VTONFS(vp), *np; nfsfh_t *fhp; u_quad_t fileno; int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; int attrflag, fhsize; #ifndef nolint dp = (struct dirent *)0; #endif #ifndef DIAGNOSTIC if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || (uiop->uio_resid & (DIRBLKSIZ - 1))) panic("nfs readdirplusrpc bad uio"); #endif ndp->ni_dvp = vp; newvp = NULLVP; /* * If there is no cookie, assume directory was stale. */ cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); if (cookiep) cookie = *cookiep; else return (NFSERR_BAD_COOKIE); /* * Loop around doing readdir rpc's of size nm_readdirsize * truncated to a multiple of DIRBLKSIZ. * The stopping criteria is EOF or buffer full. */ while (more_dirs && bigenough) { nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; nfsm_reqhead(vp, NFSPROC_READDIRPLUS, NFSX_FH(1) + 6 * NFSX_UNSIGNED); nfsm_fhtom(vp, 1); nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); *tl++ = cookie.nfsuquad[0]; *tl++ = cookie.nfsuquad[1]; *tl++ = dnp->n_cookieverf.nfsuquad[0]; *tl++ = dnp->n_cookieverf.nfsuquad[1]; *tl++ = txdr_unsigned(nmp->nm_readdirsize); *tl = txdr_unsigned(nmp->nm_rsize); nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, nfs_vpcred(vp, ND_READ)); nfsm_postop_attr(vp, attrflag); if (error) { m_freem(mrep); goto nfsmout; } nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); dnp->n_cookieverf.nfsuquad[0] = *tl++; dnp->n_cookieverf.nfsuquad[1] = *tl++; more_dirs = fxdr_unsigned(int, *tl); /* loop thru the dir entries, doctoring them to 4bsd form */ while (more_dirs && bigenough) { nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); fileno = fxdr_hyper(tl); len = fxdr_unsigned(int, *(tl + 2)); if (len <= 0 || len > NFS_MAXNAMLEN) { error = EBADRPC; m_freem(mrep); goto nfsmout; } tlen = nfsm_rndup(len); if (tlen == len) tlen += 4; /* To ensure null termination*/ left = DIRBLKSIZ - blksiz; if ((tlen + DIRHDSIZ) > left) { dp->d_reclen += left; uiop->uio_iov->iov_base += left; uiop->uio_iov->iov_len -= left; uiop->uio_offset += left; uiop->uio_resid -= left; blksiz = 0; } if ((tlen + DIRHDSIZ) > uiop->uio_resid) bigenough = 0; if (bigenough) { dp = (struct dirent *)uiop->uio_iov->iov_base; dp->d_fileno = (int)fileno; dp->d_namlen = len; dp->d_reclen = tlen + DIRHDSIZ; dp->d_type = DT_UNKNOWN; blksiz += dp->d_reclen; if (blksiz == DIRBLKSIZ) blksiz = 0; uiop->uio_offset += DIRHDSIZ; uiop->uio_resid -= DIRHDSIZ; uiop->uio_iov->iov_base += DIRHDSIZ; uiop->uio_iov->iov_len -= DIRHDSIZ; cnp->cn_nameptr = uiop->uio_iov->iov_base; cnp->cn_namelen = len; nfsm_mtouio(uiop, len); cp = uiop->uio_iov->iov_base; tlen -= len; *cp = '\0'; uiop->uio_iov->iov_base += tlen; uiop->uio_iov->iov_len -= tlen; uiop->uio_offset += tlen; uiop->uio_resid -= tlen; } else nfsm_adv(nfsm_rndup(len)); nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); if (bigenough) { cookie.nfsuquad[0] = *tl++; cookie.nfsuquad[1] = *tl++; } else tl += 2; /* * Since the attributes are before the file handle * (sigh), we must skip over the attributes and then * come back and get them. */ attrflag = fxdr_unsigned(int, *tl); if (attrflag) { dpossav1 = dpos; mdsav1 = md; nfsm_adv(NFSX_V3FATTR); nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); doit = fxdr_unsigned(int, *tl); if (doit) { nfsm_getfh(fhp, fhsize, 1); if (NFS_CMPFH(dnp, fhp, fhsize)) { VREF(vp); newvp = vp; np = dnp; } else { error = nfs_nget(vp->v_mount, fhp, fhsize, &np); if (error) doit = 0; else newvp = NFSTOV(np); } } if (doit && bigenough) { dpossav2 = dpos; dpos = dpossav1; mdsav2 = md; md = mdsav1; nfsm_loadattr(newvp, (struct vattr *)0); dpos = dpossav2; md = mdsav2; dp->d_type = IFTODT(VTTOIF(np->n_vattr.va_type)); ndp->ni_vp = newvp; cache_enter(ndp->ni_dvp, NCPNULL, ndp->ni_vp, cnp); } } else { /* Just skip over the file handle */ nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); i = fxdr_unsigned(int, *tl); nfsm_adv(nfsm_rndup(i)); } if (newvp != NULLVP) { if (newvp == vp) vrele(newvp); else vput(newvp); newvp = NULLVP; } nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); more_dirs = fxdr_unsigned(int, *tl); } /* * If at end of rpc data, get the eof boolean */ if (!more_dirs) { nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); more_dirs = (fxdr_unsigned(int, *tl) == 0); } m_freem(mrep); } /* * Fill last record, iff any, out to a multiple of DIRBLKSIZ * by increasing d_reclen for the last record. */ if (blksiz > 0) { left = DIRBLKSIZ - blksiz; dp->d_reclen += left; uiop->uio_iov->iov_base += left; uiop->uio_iov->iov_len -= left; uiop->uio_offset += left; uiop->uio_resid -= left; } /* * We are now either at the end of the directory or have filled the * block. */ if (bigenough) dnp->n_direofoffset = uiop->uio_offset; else { if (uiop->uio_resid > 0) printf("EEK! readdirplusrpc resid > 0\n"); cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); *cookiep = cookie; } nfsmout: if (newvp != NULLVP) { if (newvp == vp) vrele(newvp); else vput(newvp); newvp = NULLVP; } return (error); } /* * Silly rename. To make the NFS filesystem that is stateless look a little * more like the "ufs" a remove of an active vnode is translated to a rename * to a funny looking filename that is removed by nfs_inactive on the * nfsnode. There is the potential for another process on a different client * to create the same funny name between the nfs_lookitup() fails and the * nfs_rename() completes, but... */ static int nfs_sillyrename(dvp, vp, cnp) struct vnode *dvp, *vp; struct componentname *cnp; { struct sillyrename *sp; struct nfsnode *np; int error; cache_purge(dvp); np = VTONFS(vp); #ifndef DIAGNOSTIC if (vp->v_type == VDIR) panic("nfs: sillyrename dir"); #endif MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), M_NFSREQ, M_WAITOK); sp->s_cred = crdup(cnp->cn_cred); sp->s_dvp = dvp; VREF(dvp); /* Fudge together a funny name */ sp->s_namlen = sprintf(sp->s_name, ".nfsA%08x4.4", (int)cnp->cn_td); /* Try lookitups until we get one that isn't there */ while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, cnp->cn_td, (struct nfsnode **)0) == 0) { sp->s_name[4]++; if (sp->s_name[4] > 'z') { error = EINVAL; goto bad; } } error = nfs_renameit(dvp, cnp, sp); if (error) goto bad; error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, cnp->cn_td, &np); np->n_sillyrename = sp; return (0); bad: vrele(sp->s_dvp); crfree(sp->s_cred); free((caddr_t)sp, M_NFSREQ); return (error); } /* * Look up a file name and optionally either update the file handle or * allocate an nfsnode, depending on the value of npp. * npp == NULL --> just do the lookup * *npp == NULL --> allocate a new nfsnode and make sure attributes are * handled too * *npp != NULL --> update the file handle in the vnode */ static int nfs_lookitup(dvp, name, len, cred, td, npp) struct vnode *dvp; const char *name; int len; struct ucred *cred; struct thread *td; struct nfsnode **npp; { u_int32_t *tl; caddr_t cp; int32_t t1, t2; struct vnode *newvp = (struct vnode *)0; struct nfsnode *np, *dnp = VTONFS(dvp); caddr_t bpos, dpos, cp2; int error = 0, fhlen, attrflag; struct mbuf *mreq, *mrep, *md, *mb, *mb2; nfsfh_t *nfhp; int v3 = NFS_ISV3(dvp); nfsstats.rpccnt[NFSPROC_LOOKUP]++; nfsm_reqhead(dvp, NFSPROC_LOOKUP, NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); nfsm_fhtom(dvp, v3); nfsm_strtom(name, len, NFS_MAXNAMLEN); nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); if (npp && !error) { nfsm_getfh(nfhp, fhlen, v3); if (*npp) { np = *npp; if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { free((caddr_t)np->n_fhp, M_NFSBIGFH); np->n_fhp = &np->n_fh; } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK); bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); np->n_fhsize = fhlen; newvp = NFSTOV(np); } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { VREF(dvp); newvp = dvp; } else { error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); if (error) { m_freem(mrep); return (error); } newvp = NFSTOV(np); } if (v3) { nfsm_postop_attr(newvp, attrflag); if (!attrflag && *npp == NULL) { m_freem(mrep); if (newvp == dvp) vrele(newvp); else vput(newvp); return (ENOENT); } } else nfsm_loadattr(newvp, (struct vattr *)0); } m_freem(mrep); nfsmout: if (npp && *npp == NULL) { if (error) { if (newvp) { if (newvp == dvp) vrele(newvp); else vput(newvp); } } else *npp = np; } return (error); } /* * Nfs Version 3 commit rpc */ int nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) { caddr_t cp; u_int32_t *tl; int32_t t1, t2; struct nfsmount *nmp = VFSTONFS(vp->v_mount); caddr_t bpos, dpos, cp2; int error = 0, wccflag = NFSV3_WCCRATTR; struct mbuf *mreq, *mrep, *md, *mb, *mb2; if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) return (0); nfsstats.rpccnt[NFSPROC_COMMIT]++; nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); nfsm_fhtom(vp, 1); nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); txdr_hyper(offset, tl); tl += 2; *tl = txdr_unsigned(cnt); nfsm_request(vp, NFSPROC_COMMIT, td, nfs_vpcred(vp, ND_WRITE)); nfsm_wcc_data(vp, wccflag); if (!error) { nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, NFSX_V3WRITEVERF)) { bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF); error = NFSERR_STALEWRITEVERF; } } m_freem(mrep); nfsmout: return (error); } /* * Kludge City.. * - make nfs_bmap() essentially a no-op that does no translation * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc * (Maybe I could use the process's page mapping, but I was concerned that * Kernel Write might not be enabled and also figured copyout() would do * a lot more work than bcopy() and also it currently happens in the * context of the swapper process (2). */ static int nfs_bmap(ap) struct vop_bmap_args /* { struct vnode *a_vp; daddr_t a_bn; struct vnode **a_vpp; daddr_t *a_bnp; int *a_runp; int *a_runb; } */ *ap; { struct vnode *vp = ap->a_vp; if (ap->a_vpp != NULL) *ap->a_vpp = vp; if (ap->a_bnp != NULL) *ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize); if (ap->a_runp != NULL) *ap->a_runp = 0; if (ap->a_runb != NULL) *ap->a_runb = 0; return (0); } /* * Strategy routine. * For async requests when nfsiod(s) are running, queue the request by * calling nfs_asyncio(), otherwise just all nfs_doio() to do the * request. */ static int nfs_strategy(ap) struct vop_strategy_args *ap; { struct buf *bp = ap->a_bp; struct thread *td; int error = 0; KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); if (bp->b_flags & B_PHYS) panic("nfs physio"); if (bp->b_flags & B_ASYNC) td = NULL; else td = curthread; /* XXX */ /* * If the op is asynchronous and an i/o daemon is waiting * queue the request, wake it up and wait for completion * otherwise just do it ourselves. */ if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp, td)) error = nfs_doio(bp, td); return (error); } /* * Mmap a file * * NB Currently unsupported. */ /* ARGSUSED */ static int nfs_mmap(ap) struct vop_mmap_args /* { struct vnode *a_vp; int a_fflags; struct ucred *a_cred; struct thread *a_td; } */ *ap; { return (EINVAL); } /* * fsync vnode op. Just call nfs_flush() with commit == 1. */ /* ARGSUSED */ static int nfs_fsync(ap) struct vop_fsync_args /* { struct vnodeop_desc *a_desc; struct vnode * a_vp; struct ucred * a_cred; int a_waitfor; struct thread * a_td; } */ *ap; { return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1)); } /* * Flush all the blocks associated with a vnode. * Walk through the buffer pool and push any dirty pages * associated with the vnode. */ static int nfs_flush(vp, waitfor, td, commit) struct vnode *vp; int waitfor; struct thread *td; int commit; { struct nfsnode *np = VTONFS(vp); struct buf *bp; int i; struct buf *nbp; struct nfsmount *nmp = VFSTONFS(vp->v_mount); int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; int passone = 1; u_quad_t off, endoff, toff; struct buf **bvec = NULL; #ifndef NFS_COMMITBVECSIZ #define NFS_COMMITBVECSIZ 20 #endif struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; int bvecsize = 0, bveccount; if (nmp->nm_flag & NFSMNT_INT) slpflag = PCATCH; if (!commit) passone = 0; /* * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the * server, but nas not been committed to stable storage on the server * yet. On the first pass, the byte range is worked out and the commit * rpc is done. On the second pass, nfs_writebp() is called to do the * job. */ again: off = (u_quad_t)-1; endoff = 0; bvecpos = 0; if (NFS_ISV3(vp) && commit) { s = splbio(); /* * Count up how many buffers waiting for a commit. */ bveccount = 0; for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = TAILQ_NEXT(bp, b_vnbufs); if (BUF_REFCNT(bp) == 0 && (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) == (B_DELWRI | B_NEEDCOMMIT)) bveccount++; } /* * Allocate space to remember the list of bufs to commit. It is * important to use M_NOWAIT here to avoid a race with nfs_write. * If we can't get memory (for whatever reason), we will end up * committing the buffers one-by-one in the loop below. */ if (bvec != NULL && bvec != bvec_on_stack) free(bvec, M_TEMP); if (bveccount > NFS_COMMITBVECSIZ) { bvec = (struct buf **) malloc(bveccount * sizeof(struct buf *), M_TEMP, M_NOWAIT); if (bvec == NULL) { bvec = bvec_on_stack; bvecsize = NFS_COMMITBVECSIZ; } else bvecsize = bveccount; } else { bvec = bvec_on_stack; bvecsize = NFS_COMMITBVECSIZ; } for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = TAILQ_NEXT(bp, b_vnbufs); if (bvecpos >= bvecsize) break; if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != (B_DELWRI | B_NEEDCOMMIT) || BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) continue; bremfree(bp); /* * NOTE: we are not clearing B_DONE here, so we have * to do it later on in this routine if we intend to * initiate I/O on the bp. * * Note: to avoid loopback deadlocks, we do not * assign b_runningbufspace. */ bp->b_flags |= B_WRITEINPROG; vfs_busy_pages(bp, 1); /* * bp is protected by being locked, but nbp is not * and vfs_busy_pages() may sleep. We have to * recalculate nbp. */ nbp = TAILQ_NEXT(bp, b_vnbufs); /* * A list of these buffers is kept so that the * second loop knows which buffers have actually * been committed. This is necessary, since there * may be a race between the commit rpc and new * uncommitted writes on the file. */ bvec[bvecpos++] = bp; toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; if (toff < off) off = toff; toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); if (toff > endoff) endoff = toff; } splx(s); } if (bvecpos > 0) { /* * Commit data on the server, as required. Note that * nfs_commit will use the vnode's cred for the commit. */ retv = nfs_commit(vp, off, (int)(endoff - off), td); if (retv == NFSERR_STALEWRITEVERF) nfs_clearcommit(vp->v_mount); /* * Now, either mark the blocks I/O done or mark the * blocks dirty, depending on whether the commit * succeeded. */ for (i = 0; i < bvecpos; i++) { bp = bvec[i]; bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK); if (retv) { /* * Error, leave B_DELWRI intact */ vfs_unbusy_pages(bp); brelse(bp); } else { /* * Success, remove B_DELWRI ( bundirty() ). * * b_dirtyoff/b_dirtyend seem to be NFS * specific. We should probably move that * into bundirty(). XXX */ s = splbio(); vp->v_numoutput++; bp->b_flags |= B_ASYNC; bundirty(bp); bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); bp->b_dirtyoff = bp->b_dirtyend = 0; splx(s); biodone(bp); } } } /* * Start/do any write(s) that are required. */ loop: s = splbio(); for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = TAILQ_NEXT(bp, b_vnbufs); if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { if (waitfor != MNT_WAIT || passone) continue; error = BUF_TIMELOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL, "nfsfsync", slpflag, slptimeo); splx(s); if (error == 0) panic("nfs_fsync: inconsistent lock"); if (error == ENOLCK) goto loop; if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { error = EINTR; goto done; } if (slpflag == PCATCH) { slpflag = 0; slptimeo = 2 * hz; } goto loop; } if ((bp->b_flags & B_DELWRI) == 0) panic("nfs_fsync: not dirty"); if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { BUF_UNLOCK(bp); continue; } bremfree(bp); if (passone || !commit) bp->b_flags |= B_ASYNC; else bp->b_flags |= B_ASYNC | B_WRITEINPROG; splx(s); VOP_BWRITE(bp->b_vp, bp); goto loop; } splx(s); if (passone) { passone = 0; goto again; } if (waitfor == MNT_WAIT) { while (vp->v_numoutput) { vp->v_flag |= VBWAIT; error = tsleep((caddr_t)&vp->v_numoutput, slpflag, "nfsfsync", slptimeo); if (error) { if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { error = EINTR; goto done; } if (slpflag == PCATCH) { slpflag = 0; slptimeo = 2 * hz; } } } if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) { goto loop; } } if (np->n_flag & NWRITEERR) { error = np->n_error; np->n_flag &= ~NWRITEERR; } done: if (bvec != NULL && bvec != bvec_on_stack) free(bvec, M_TEMP); return (error); } /* * NFS advisory byte-level locks. * Currently unsupported. */ static int nfs_advlock(ap) struct vop_advlock_args /* { struct vnode *a_vp; caddr_t a_id; int a_op; struct flock *a_fl; int a_flags; } */ *ap; { struct nfsnode *np = VTONFS(ap->a_vp); /* * The following kludge is to allow diskless support to work * until a real NFS lockd is implemented. Basically, just pretend * that this is a local lock. */ return (lf_advlock(ap, &(np->n_lockf), np->n_size)); } /* * Print out the contents of an nfsnode. */ static int nfs_print(ap) struct vop_print_args /* { struct vnode *a_vp; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); printf("tag VT_NFS, fileid %ld fsid 0x%x", np->n_vattr.va_fileid, np->n_vattr.va_fsid); if (vp->v_type == VFIFO) fifo_printinfo(vp); printf("\n"); return (0); } /* * Just call nfs_writebp() with the force argument set to 1. * * NOTE: B_DONE may or may not be set in a_bp on call. */ static int nfs_bwrite(ap) struct vop_bwrite_args /* { struct vnode *a_bp; } */ *ap; { return (nfs_writebp(ap->a_bp, 1, curthread)); } /* * This is a clone of vn_bwrite(), except that B_WRITEINPROG isn't set unless * the force flag is one and it also handles the B_NEEDCOMMIT flag. We set * B_CACHE if this is a VMIO buffer. */ int nfs_writebp(bp, force, td) struct buf *bp; int force; struct thread *td; { int s; int oldflags = bp->b_flags; #if 0 int retv = 1; off_t off; #endif if (BUF_REFCNT(bp) == 0) panic("bwrite: buffer is not locked???"); if (bp->b_flags & B_INVAL) { brelse(bp); return(0); } bp->b_flags |= B_CACHE; /* * Undirty the bp. We will redirty it later if the I/O fails. */ s = splbio(); bundirty(bp); bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); bp->b_vp->v_numoutput++; splx(s); /* * Note: to avoid loopback deadlocks, we do not * assign b_runningbufspace. */ vfs_busy_pages(bp, 1); if (force) bp->b_flags |= B_WRITEINPROG; BUF_KERNPROC(bp); VOP_STRATEGY(bp->b_vp, bp); if( (oldflags & B_ASYNC) == 0) { int rtval = biowait(bp); if (oldflags & B_DELWRI) { s = splbio(); reassignbuf(bp, bp->b_vp); splx(s); } brelse(bp); return (rtval); } return (0); } /* * nfs special file access vnode op. * Essentially just get vattr and then imitate iaccess() since the device is * local to the client. */ static int nfsspec_access(ap) struct vop_access_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vattr *vap; gid_t *gp; struct ucred *cred = ap->a_cred; struct vnode *vp = ap->a_vp; mode_t mode = ap->a_mode; struct vattr vattr; int i; int error; /* * Disallow write attempts on filesystems mounted read-only; * unless the file is a socket, fifo, or a block or character * device resident on the filesystem. */ if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { switch (vp->v_type) { case VREG: case VDIR: case VLNK: return (EROFS); default: break; } } /* * If you're the super-user, * you always get access. */ if (cred->cr_uid == 0) return (0); vap = &vattr; error = VOP_GETATTR(vp, vap, ap->a_td); if (error) return (error); /* * Access check is based on only one of owner, group, public. * If not owner, then check group. If not a member of the * group, then check public access. */ if (cred->cr_uid != vap->va_uid) { mode >>= 3; gp = cred->cr_groups; for (i = 0; i < cred->cr_ngroups; i++, gp++) if (vap->va_gid == *gp) goto found; mode >>= 3; found: ; } error = (vap->va_mode & mode) == mode ? 0 : EACCES; return (error); } /* * Read wrapper for special devices. */ static int nfsspec_read(ap) struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { struct nfsnode *np = VTONFS(ap->a_vp); /* * Set access flag. */ np->n_flag |= NACC; getnanotime(&np->n_atim); return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); } /* * Write wrapper for special devices. */ static int nfsspec_write(ap) struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { struct nfsnode *np = VTONFS(ap->a_vp); /* * Set update flag. */ np->n_flag |= NUPD; getnanotime(&np->n_mtim); return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); } /* * Close wrapper for special devices. * * Update the times on the nfsnode then do device close. */ static int nfsspec_close(ap) struct vop_close_args /* { struct vnode *a_vp; int a_fflag; struct ucred *a_cred; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); struct vattr vattr; if (np->n_flag & (NACC | NUPD)) { np->n_flag |= NCHG; if (vp->v_usecount == 1 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { VATTR_NULL(&vattr); if (np->n_flag & NACC) vattr.va_atime = np->n_atim; if (np->n_flag & NUPD) vattr.va_mtime = np->n_mtim; (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE), ap->a_td); } } return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); } /* * Read wrapper for fifos. */ static int nfsfifo_read(ap) struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { struct nfsnode *np = VTONFS(ap->a_vp); /* * Set access flag. */ np->n_flag |= NACC; getnanotime(&np->n_atim); return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); } /* * Write wrapper for fifos. */ static int nfsfifo_write(ap) struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { struct nfsnode *np = VTONFS(ap->a_vp); /* * Set update flag. */ np->n_flag |= NUPD; getnanotime(&np->n_mtim); return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); } /* * Close wrapper for fifos. * * Update the times on the nfsnode then do fifo close. */ static int nfsfifo_close(ap) struct vop_close_args /* { struct vnode *a_vp; int a_fflag; struct thread *a_td; } */ *ap; { struct vnode *vp = ap->a_vp; struct nfsnode *np = VTONFS(vp); struct vattr vattr; struct timespec ts; if (np->n_flag & (NACC | NUPD)) { getnanotime(&ts); if (np->n_flag & NACC) np->n_atim = ts; if (np->n_flag & NUPD) np->n_mtim = ts; np->n_flag |= NCHG; if (vp->v_usecount == 1 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { VATTR_NULL(&vattr); if (np->n_flag & NACC) vattr.va_atime = np->n_atim; if (np->n_flag & NUPD) vattr.va_mtime = np->n_mtim; (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE), ap->a_td); } } return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); }