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freebsd-nq/sys/nfs4client/nfs4_vnops.c
Mohan Srinivasan 7d7d9e2242 Fixes up the handling of shared vnode lock lookups in the NFS client, 
adds a FS type specific flag indicating that the FS supports shared
vnode lock lookups, adds some logic in vfs_lookup.c to test this flag
and set lock flags appropriately.

- amd on 6.x is a non-starter (without this change). Using amd under
  heavy load results in a deadlock (with cascading vnode locks all the
  way to the root) very quickly.
- This change should also fix the more general problem of cascading
  vnode deadlocks when an NFS server goes down.

Ideally, we wouldn't need these changes, as enabling shared vnode lock
lookups globally would work. Unfortunately, UFS, for example isn't
ready for shared vnode lock lookups, crashing pretty quickly.

This change is the result of discussions with Stephan Uphoff (ups@).

Reviewed by:	ups@
2006-09-13 18:39:09 +00:00

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/* $FreeBSD$ */
/* $Id: nfs_vnops.c,v 1.45 2003/11/05 14:59:02 rees Exp $ */
/*-
* copyright (c) 2003
* the regents of the university of michigan
* all rights reserved
*
* permission is granted to use, copy, create derivative works and redistribute
* this software and such derivative works for any purpose, so long as the name
* of the university of michigan is not used in any advertising or publicity
* pertaining to the use or distribution of this software without specific,
* written prior authorization. if the above copyright notice or any other
* identification of the university of michigan is included in any copy of any
* portion of this software, then the disclaimer below must also be included.
*
* this software is provided as is, without representation from the university
* of michigan as to its fitness for any purpose, and without warranty by the
* university of michigan of any kind, either express or implied, including
* without limitation the implied warranties of merchantability and fitness for
* a particular purpose. the regents of the university of michigan shall not be
* liable for any damages, including special, indirect, incidental, or
* consequential damages, with respect to any claim arising out of or in
* connection with the use of the software, even if it has been or is hereafter
* advised of the possibility of such damages.
*/
/*
* 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_vnops.c 8.16 (Berkeley) 5/27/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* vnode op calls for Sun NFS version 2 and 3
*/
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/namei.h>
#include <sys/socket.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/lockf.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/lockmgr.h>
#include <sys/signalvar.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <fs/fifofs/fifo.h>
#include <rpc/rpcclnt.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfs4client/nfs4.h>
#include <nfsclient/nfsnode.h>
#include <nfsclient/nfsmount.h>
#include <nfsclient/nfs_lock.h>
#include <nfs/xdr_subs.h>
#include <nfsclient/nfsm_subs.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
/* NFSv4 */
#include <nfs4client/nfs4m_subs.h>
#include <nfs4client/nfs4_vn.h>
/* 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 nfs4_flush(struct vnode *, int, struct thread *,
int);
static int nfs4_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
struct thread *);
static int nfs4_closerpc(struct vnode *, struct ucred *, struct thread *, int);
static vop_lookup_t nfs4_lookup;
static vop_create_t nfs4_create;
static vop_mknod_t nfs4_mknod;
static vop_open_t nfs4_open;
static vop_close_t nfs4_close;
static vop_access_t nfs4_access;
static vop_getattr_t nfs4_getattr;
static vop_setattr_t nfs4_setattr;
static vop_read_t nfs4_read;
static vop_fsync_t nfs4_fsync;
static vop_remove_t nfs4_remove;
static vop_link_t nfs4_link;
static vop_rename_t nfs4_rename;
static vop_mkdir_t nfs4_mkdir;
static vop_rmdir_t nfs4_rmdir;
static vop_symlink_t nfs4_symlink;
static vop_readdir_t nfs4_readdir;
static vop_strategy_t nfs4_strategy;
static int nfs4_lookitup(struct vnode *, const char *, int,
struct ucred *, struct thread *, struct nfsnode **);
static int nfs4_sillyrename(struct vnode *, struct vnode *,
struct componentname *);
static vop_readlink_t nfs4_readlink;
static vop_print_t nfs4_print;
static vop_advlock_t nfs4_advlock;
/*
* Global vfs data structures for nfs
*/
struct vop_vector nfs4_vnodeops = {
.vop_default = &default_vnodeops,
.vop_access = nfs4_access,
.vop_advlock = nfs4_advlock,
.vop_close = nfs4_close,
.vop_create = nfs4_create,
.vop_fsync = nfs4_fsync,
.vop_getattr = nfs4_getattr,
.vop_getpages = nfs_getpages,
.vop_putpages = nfs_putpages,
.vop_inactive = nfs_inactive,
.vop_lease = VOP_NULL,
.vop_link = nfs4_link,
.vop_lookup = nfs4_lookup,
.vop_mkdir = nfs4_mkdir,
.vop_mknod = nfs4_mknod,
.vop_open = nfs4_open,
.vop_print = nfs4_print,
.vop_read = nfs4_read,
.vop_readdir = nfs4_readdir,
.vop_readlink = nfs4_readlink,
.vop_reclaim = nfs_reclaim,
.vop_remove = nfs4_remove,
.vop_rename = nfs4_rename,
.vop_rmdir = nfs4_rmdir,
.vop_setattr = nfs4_setattr,
.vop_strategy = nfs4_strategy,
.vop_symlink = nfs4_symlink,
.vop_write = nfs_write,
};
static int nfs4_removerpc(struct vnode *dvp, const char *name, int namelen,
struct ucred *cred, struct thread *td);
static int nfs4_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 nfs4_renameit(struct vnode *sdvp, struct componentname *scnp,
struct sillyrename *sp);
static int nfs4_openrpc(struct vnode *, struct vnode **,
struct componentname *, int, struct vattr *);
static int nfs4_open_confirm(struct vnode *vp, struct nfs4_compound *cpp,
struct nfs4_oparg_open *openap,
struct nfs4_oparg_getfh *gfh,
struct ucred *cred, struct thread *td);
static int nfs4_createrpc(struct vnode *, struct vnode **,
struct componentname *, nfstype,
struct vattr *, char *);
/*
* Global variables
*/
struct nfs4_lowner nfs4_masterlowner;
#define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1))
SYSCTL_DECL(_vfs_nfs4);
static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
SYSCTL_INT(_vfs_nfs4, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
&nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
static int nfsv3_commit_on_close = 0;
SYSCTL_INT(_vfs_nfs4, 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_nfs4, OID_AUTO, access_cache_hits, CTLFLAG_RD,
&nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count");
SYSCTL_INT(_vfs_nfs4, 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;
return (0);
struct mbuf *mreq, *mrep = NULL, *md, *mb;
caddr_t bpos, dpos;
u_int32_t rmode;
struct nfsnode *np = VTONFS(vp);
nfsstats.rpccnt[NFSPROC_ACCESS]++;
mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
*tl = txdr_unsigned(wmode);
nfsm_request(vp, NFSPROC_ACCESS, td, cred);
nfsm_postop_attr(vp, attrflag);
if (!error) {
tl = nfsm_dissect(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 = time_second;
}
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
nfs4_access(struct vop_access_args *ap)
{
struct vnode *vp = ap->a_vp;
int error = 0;
u_int32_t mode, wmode;
int v3 = NFS_ISV3(vp); /* v3 \in v4 */
struct nfsnode *np = VTONFS(vp);
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_compound cp;
struct nfs4_oparg_access acc;
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
/*
* 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.
*/
/* XXX Disable this for now; needs fixing of _access_otw() */
if (0 && 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 ((time_second < (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;
}
}
}
return (error);
}
/* XXX use generic access code here? */
mode = ap->a_mode & VREAD ? NFSV4ACCESS_READ : 0;
if (vp->v_type == VDIR) {
if (ap->a_mode & VWRITE)
mode |= NFSV4ACCESS_MODIFY | NFSV4ACCESS_EXTEND | NFSV4ACCESS_DELETE;
if (ap->a_mode & VEXEC)
mode |= NFSV4ACCESS_LOOKUP;
} else {
if (ap->a_mode & VWRITE)
mode |= NFSV4ACCESS_MODIFY | NFSV4ACCESS_EXTEND;
if (ap->a_mode & VEXEC)
mode |= NFSV4ACCESS_EXECUTE;
}
nfs_v4initcompound(&cp);
acc.mode = mode;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(&cp, "nfs4_access()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_access(&cp, &acc);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_access(&cp, &acc);
if ((acc.rmode & mode) != mode)
error = EACCES;
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
return (error);
}
static int
nfs4_openrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
int flags, struct vattr *vap)
{
struct vnode *vp = *vpp;
struct nfs4_oparg_getattr getattr;
struct nfs4_oparg_getfh getfh;
struct nfs4_oparg_open opena;
struct nfs4_compound cp;
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
struct nfs4_fctx xfc, *fcp;
struct nfsnode *np;
if (vp == NULL) {
/* Create a new file */
np = NULL;
fcp = &xfc;
bzero(fcp, sizeof(*fcp));
} else {
np = VTONFS(vp);
fcp = flags & FWRITE ? &np->n_wfc : &np->n_rfc;
}
/*
* Since we are currently only one lockowner; we only open the
* file once each for reading and writing.
*/
if (fcp->refcnt++ != 0) {
*vpp = vp;
/*printf("not opening %s\n", np->n_name != NULL ? np->n_name : "");*/
return (0);
}
fcp->lop = &nfs4_masterlowner;
fcp->np = np;
nfs_v4initcompound(&cp);
cp.nmp = VFSTONFS(dvp->v_mount);
opena.ctype = NCLNULL;
opena.flags = flags;
opena.vap = vap;
opena.fcp = fcp; /* For lockowner */
opena.cnp = cnp;
getattr.bm = &nfsv4_getattrbm;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(&cp, "nfs4_openrpc()");
nfsm_v4build_putfh(&cp, dvp);
nfsm_v4build_open(&cp, &opena);
nfsm_v4build_getattr(&cp, &getattr);
nfsm_v4build_getfh(&cp, &getfh);
nfsm_v4build_finalize(&cp);
nfsm_request(vp != NULL ? vp : dvp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_open(&cp, &opena);
nfsm_v4dissect_getattr(&cp, &getattr);
nfsm_v4dissect_getfh(&cp, &getfh);
error = nfs_v4postop(&cp, error);
if (opena.rflags & NFSV4OPENRES_CONFIRM) {
error = nfs4_open_confirm(vp ? vp : dvp, &cp, &opena, &getfh, cred, td);
if (error != 0)
goto nfsmout;
}
if (vp == NULL) {
/* New file */
error = nfs_nget(dvp->v_mount, &getfh.fh_val,
getfh.fh_len, &np, LK_EXCLUSIVE);
if (error != 0)
goto nfsmout;
vp = NFSTOV(np);
np->n_dvp = dvp;
np->n_namelen = cnp->cn_namelen; /* XXX memory leaks on these; track! */
if (np->n_name != NULL)
FREE(np->n_name, M_NFSREQ);
MALLOC(np->n_name, u_char *, np->n_namelen + 1, M_NFSREQ, M_WAITOK);
bcopy(cnp->cn_nameptr, np->n_name, np->n_namelen);
np->n_name[np->n_namelen] = '\0';
if (flags & FWRITE)
np->n_wfc = *fcp;
else
np->n_rfc = *fcp;
/*printf("opened new file %s\n", np->n_name);*/
nfs4_vnop_loadattrcache(vp, &getattr.fa, NULL);
*vpp = vp;
} else {
/*printf("openend \"old\" %s\n", np->n_name != NULL ? np->n_name : "");*/
if (flags & O_TRUNC && np->n_size != 0) {
struct vattr va;
VATTR_NULL(&va);
va.va_size = 0;
error = nfs4_setattrrpc(vp, &va,
cnp->cn_cred, cnp->cn_thread);
}
np->n_attrstamp = 0;
}
nfsmout:
if (mrep != NULL)
m_freem(mrep);
return (error);
}
static int
nfs4_open_confirm(struct vnode *vp, struct nfs4_compound *cpp,
struct nfs4_oparg_open *openap, struct nfs4_oparg_getfh *gfh,
struct ucred *cred, struct thread *td)
{
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
nfs_v4initcompound(cpp);
cpp->nmp = VFSTONFS(vp->v_mount);
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(cpp, "nfs4_open_confirm()");
nfsm_v4build_putfh_nv(cpp, gfh);
nfsm_v4build_open_confirm(cpp, openap);
nfsm_v4build_finalize(cpp);
nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(cpp);
nfsm_v4dissect_putfh(cpp);
nfsm_v4dissect_open_confirm(cpp, openap);
nfsmout:
error = nfs_v4postop(cpp, error);
if (mrep != NULL)
m_freem(mrep);
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
nfs4_open(struct vop_open_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
enum vtype vtype = vp->v_type;
int mode = ap->a_mode;
struct componentname cn;
if (vtype != VREG) {
if (vtype != VDIR && vtype != VLNK) {
#ifdef DIAGNOSTIC
printf("open eacces vtyp=%d\n", vp->v_type);
#endif
return (EACCES);
} else
return (0);
}
if (np->n_flag & NCREATED) {
np->n_flag &= ~NCREATED;
return (0);
}
cn.cn_nameptr = np->n_name;
cn.cn_namelen = np->n_namelen;
cn.cn_cred = ap->a_cred;
cn.cn_thread = ap->a_td;
return (nfs4_openrpc(np->n_dvp, &vp, &cn, mode, NULL));
}
static int
nfs4_closerpc(struct vnode *vp, struct ucred *cred, struct thread *td, int flags)
{
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_fctx *fcp;
struct nfs4_compound cp;
struct nfsnode *np = VTONFS(vp);
fcp = flags & FWRITE ? &np->n_wfc : &np->n_rfc;
nfs_v4initcompound(&cp);
if (--fcp->refcnt != 0)
return (0);
/*printf("closing %s\n", np->n_name != NULL ? np->n_name : "");*/
cp.fcp = fcp;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(&cp, "nfs4_closerpc()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_close(&cp, fcp);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_close(&cp, fcp);
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
return (error);
}
/*
* nfs close vnode op
* play it safe for now (see comments in v2/v3 nfs_close regarding dirty buffers)
*/
/* ARGSUSED */
static int
nfs4_close(struct vop_close_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
int error = 0;
if (vp->v_type != VREG)
return (0);
if (np->n_flag & NMODIFIED) {
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
np->n_attrstamp = 0;
}
error = nfs4_closerpc(vp, ap->a_cred, ap->a_td, ap->a_fflag);
if (!error && np->n_flag & NWRITEERR) {
np->n_flag &= ~NWRITEERR;
error = np->n_error;
}
return (error);
}
/*
* nfs getattr call from vfs.
*/
static int
nfs4_getattr(struct vop_getattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_oparg_getattr ga;
struct nfs4_compound cp;
/*
* 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);
nfsstats.rpccnt[NFSPROC_GETATTR]++;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, NFSX_FH(1));
mb = mreq;
bpos = mtod(mb, caddr_t);
ga.bm = &nfsv4_getattrbm;
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_getattr()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_getattr(&cp, &ga);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, ap->a_td, ap->a_cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_getattr(&cp, &ga);
nfs4_vnop_loadattrcache(vp, &ga.fa, ap->a_vap);
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
return (error);
}
/*
* nfs setattr call.
*/
static int
nfs4_setattr(struct vop_setattr_args *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_cred,
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) {
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);
if (vap->va_size != VNOVAL && np->n_wfc.refcnt == 0) {
/* Have to open the file before we can truncate it */
struct componentname cn;
cn.cn_nameptr = np->n_name;
cn.cn_namelen = np->n_namelen;
cn.cn_cred = ap->a_cred;
cn.cn_thread = ap->a_td;
error = nfs4_openrpc(np->n_dvp, &vp, &cn, FWRITE, NULL);
if (error)
return error;
np->n_flag |= NTRUNCATE;
}
error = nfs4_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
nfs4_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
struct thread *td)
{
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_compound cp;
struct nfs4_oparg_getattr ga;
struct nfsnode *np = VTONFS(vp);
struct nfs4_fctx *fcp;
nfsstats.rpccnt[NFSPROC_SETATTR]++;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
ga.bm = &nfsv4_getattrbm;
fcp = (vap->va_size != VNOVAL) ? &np->n_wfc : NULL;
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_setattrrpc");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_setattr(&cp, vap, fcp);
nfsm_v4build_getattr(&cp, &ga);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_setattr(&cp);
nfsm_v4dissect_getattr(&cp, &ga);
nfs4_vnop_loadattrcache(vp, &ga.fa, NULL);
/* TODO: do the settatr and close in a single compound rpc */
if (np->n_flag & NTRUNCATE) {
error = nfs4_closerpc(vp, cred, td, FWRITE);
np->n_flag &= ~NTRUNCATE;
}
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
return (error);
}
/*
* nfs lookup call, one step at a time...
* First look in cache
* If not found, unlock the directory nfsnode and do the rpc
*/
static int
nfs4_lookup(struct vop_lookup_args *ap)
{
struct componentname *cnp = ap->a_cnp;
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
int isdot, flags = cnp->cn_flags;
struct vnode *newvp;
struct nfsmount *nmp;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
long len;
nfsfh_t *fhp;
struct nfsnode *np;
int error = 0, fhsize;
struct thread *td = cnp->cn_thread;
struct nfs4_compound cp;
struct nfs4_oparg_getattr ga, dga;
struct nfs4_oparg_lookup l;
struct nfs4_oparg_getfh gfh;
*vpp = NULLVP;
if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
if (dvp->v_type != VDIR)
return (ENOTDIR);
nmp = VFSTONFS(dvp->v_mount);
np = VTONFS(dvp);
isdot = cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.';
if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
*vpp = NULLVP;
return (error);
}
if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) {
struct vattr vattr;
newvp = *vpp;
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, td)
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
nfsstats.lookupcache_hits++;
if (cnp->cn_nameiop != LOOKUP &&
(flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
return (0);
}
cache_purge(newvp);
if (newvp != dvp)
vput(newvp);
else
vrele(newvp);
}
error = 0;
newvp = NULLVP;
nfsstats.lookupcache_misses++;
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
len = cnp->cn_namelen;
mreq = nfsm_reqhead(NULL, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
ga.bm = &nfsv4_getattrbm;
dga.bm = &nfsv4_getattrbm;
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_lookup()");
nfsm_v4build_putfh(&cp, dvp);
nfsm_v4build_getattr(&cp, &dga);
if (flags & ISDOTDOT)
nfsm_v4build_lookupp(&cp);
else if (!isdot) {
l.name = cnp->cn_nameptr;
l.namelen = len;
nfsm_v4build_lookup(&cp, &l);
}
nfsm_v4build_getattr(&cp, &ga);
nfsm_v4build_getfh(&cp, &gfh);
nfsm_v4build_finalize(&cp);
nfsm_request(dvp, NFSV4PROC_COMPOUND, cnp->cn_thread, cnp->cn_cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_getattr(&cp, &dga);
if (flags & ISDOTDOT)
nfsm_v4dissect_lookupp(&cp);
else if (!isdot)
nfsm_v4dissect_lookup(&cp);
nfsm_v4dissect_getattr(&cp, &ga);
nfsm_v4dissect_getfh(&cp, &gfh);
nfs4_vnop_loadattrcache(dvp, &dga.fa, NULL);
fhp = &gfh.fh_val;
fhsize = gfh.fh_len;
/*
* Handle RENAME case...
*/
if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
if (NFS_CMPFH(np, fhp, fhsize))
return (EISDIR);
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE);
if (error)
return (error);
newvp = NFSTOV(np);
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
*vpp = newvp;
cnp->cn_flags |= SAVENAME;
return (0);
}
if (flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, td);
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE);
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
if (error)
return (error);
newvp = NFSTOV(np);
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
} else if (NFS_CMPFH(np, fhp, fhsize)) {
VREF(dvp);
newvp = dvp;
} else {
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, LK_EXCLUSIVE);
if (error)
return (error);
newvp = NFSTOV(np);
/* Fill in np used by open. */
np->n_dvp = dvp;
np->n_namelen = cnp->cn_namelen;
if (np->n_name != NULL)
FREE(np->n_name, M_NFSREQ);
MALLOC(np->n_name, u_char *, np->n_namelen + 1, M_NFSREQ, M_WAITOK);
bcopy(cnp->cn_nameptr, np->n_name, np->n_namelen);
np->n_name[np->n_namelen] = '\0';
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
}
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
if ((cnp->cn_flags & MAKEENTRY) &&
(cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) {
np->n_ctime = np->n_vattr.va_ctime.tv_sec;
cache_enter(dvp, newvp, cnp);
}
*vpp = newvp;
m_freem(mrep);
nfsmout:
error = nfs_v4postop(&cp, error);
if (error) {
if (newvp != NULLVP) {
vrele(newvp);
*vpp = NULLVP;
}
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
(flags & ISLASTCN) && error == ENOENT) {
if (dvp->v_mount->mnt_flag & MNT_RDONLY)
error = EROFS;
else
error = EJUSTRETURN;
}
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
}
return (error);
}
/*
* nfs read call.
* Just call nfs_bioread() to do the work.
*/
static int
nfs4_read(struct vop_read_args *ap)
{
struct vnode *vp = ap->a_vp;
switch (vp->v_type) {
case VREG:
return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
case VDIR:
return (EISDIR);
default:
return (EOPNOTSUPP);
}
}
/*
* nfs readlink call
*/
static int
nfs4_readlink(struct vop_readlink_args *ap)
{
struct vnode *vp = ap->a_vp;
if (vp->v_type != VLNK)
return (EINVAL);
return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred));
}
/*
* Do a readlink rpc.
* Called by nfs_doio() from below the buffer cache.
*/
int
nfs4_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_compound cp;
nfsstats.rpccnt[NFSPROC_READLINK]++;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_readlinkrpc()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_readlink(&cp);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_readlink(&cp, uiop);
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
return (error);
}
/*
* nfs read rpc call
* Ditto above
*/
int
nfs4_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfsmount *nmp;
int error = 0, len, tsiz;
struct nfs4_compound cp;
struct nfs4_oparg_read read;
struct nfsnode *np = VTONFS(vp);
nmp = VFSTONFS(vp->v_mount);
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
return (EFBIG);
if (tsiz == 0)
return (0);
read.uiop = uiop;
read.fcp = np->n_rfc.refcnt > 0 ? &np->n_rfc : &np->n_wfc;
while (tsiz > 0) {
nfsstats.rpccnt[NFSPROC_READ]++;
len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
read.off = uiop->uio_offset;
read.maxcnt = len;
nfs_v4initcompound(&cp);
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(&cp, "nfs4_readrpc()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_read(&cp, &read);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
if (error != 0) {
error = nfs_v4postop(&cp, error);
goto nfsmout;
}
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_read(&cp, &read);
if (read.eof || read.retlen == 0)
tsiz = 0;
else
tsiz -= read.retlen;
error = nfs_v4postop(&cp, error);
m_freem(mrep);
mrep = NULL;
}
nfsmout:
if (mrep != NULL)
m_freem(mrep);
return (error);
}
/*
* nfs write call
*/
int
nfs4_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
int *iomode, int *must_commit)
{
int32_t backup;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
int error = 0, len, tsiz, wccflag = 1, rlen;
struct nfs4_compound cp;
struct nfs4_oparg_write write;
nfsv4stablehow commit, committed = NSHFILESYNC;
caddr_t verf;
struct nfsnode *np = VTONFS(vp);
#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);
if (tsiz == 0)
return (0);
write.stable = (nfsv4stablehow)*iomode;
write.uiop = uiop;
write.fcp = &np->n_wfc;
while (tsiz > 0) {
nfsstats.rpccnt[NFSPROC_WRITE]++;
len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz;
write.off = uiop->uio_offset;
write.cnt = len;
nfs_v4initcompound(&cp);
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(&cp, "nfs4_writerpc()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_write(&cp, &write);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
if (error != 0) {
error = nfs_v4postop(&cp, error);
goto nfsmout;
}
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_write(&cp, &write);
rlen = write.retlen;
if (rlen == 0) {
error = NFSERR_IO;
break;
} else if (rlen < len) {
backup = len - rlen;
uiop->uio_iov->iov_base =
(char *)uiop->uio_iov->iov_base - backup;
uiop->uio_iov->iov_len += backup;
uiop->uio_offset -= backup;
uiop->uio_resid += backup;
len = rlen;
}
commit = write.committed;
if (committed == NSHFILESYNC ||
(committed = NSHDATASYNC && commit == NSHUNSTABLE))
committed = commit;
verf = (caddr_t)write.wverf;
if ((nmp->nm_flag & NFSSTA_HASWRITEVERF) == 0) {
bcopy(verf, nmp->nm_verf, NFSX_V4VERF);
nmp->nm_flag |= NFSMNT_HASWRITEVERF;
} else if (bcmp(verf, nmp->nm_verf, NFSX_V4VERF)) {
*must_commit = 1;
bcopy(verf, nmp->nm_verf, NFSX_V4VERF);
}
/* XXX wccflag */
if (wccflag)
VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime;
error = nfs_v4postop(&cp, error);
m_freem(mrep);
mrep = NULL;
if (error)
break;
tsiz -= len;
}
nfsmout:
if (mrep != NULL)
m_freem(mrep);
*iomode = committed;
if (error)
uiop->uio_resid = tsiz;
return (error);
}
/* ARGSUSED */
static int
nfs4_mknod(struct vop_mknod_args *ap)
{
struct vattr *vap = ap->a_vap;
struct vnode *newvp = NULL;
int error;
error = nfs4_createrpc(ap->a_dvp, &newvp,
ap->a_cnp, (nfstype)vap->va_type, vap, NULL);
/* XXX - is this actually referenced here? */
if (error == 0) {
*ap->a_vpp = newvp;
vrele(newvp);
}
return (error);
}
static int
nfs4_createrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
nfstype ftype, struct vattr *vap, char *linktarget)
{
struct nfsnode *dnp = VTONFS(dvp);
struct nfsnode *np = NULL;
struct vnode *newvp = NULL;
struct nfs4_compound cp;
struct nfs4_oparg_create c;
struct nfs4_oparg_getattr ga;
struct nfs4_oparg_getfh gfh;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
int error = 0;
nfsstats.rpccnt[NFSPROC_CREATE]++;
mreq = nfsm_reqhead(dvp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
bzero(&c, sizeof(c));
bzero(&ga, sizeof(ga));
c.type = ftype;
c.vap = vap;
c.linktext = linktarget;
c.name = cnp->cn_nameptr;
c.namelen = cnp->cn_namelen;
ga.bm = &nfsv4_getattrbm;
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_createrpc()");
nfsm_v4build_putfh(&cp, dvp);
nfsm_v4build_create(&cp, &c);
nfsm_v4build_getattr(&cp, &ga);
nfsm_v4build_getfh(&cp, &gfh);
nfsm_v4build_finalize(&cp);
nfsm_request(dvp, NFSV4PROC_COMPOUND, cnp->cn_thread, cnp->cn_cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_create(&cp, &c);
nfsm_v4dissect_getattr(&cp, &ga);
nfsm_v4dissect_getfh(&cp, &gfh);
error = nfs_nget(dvp->v_mount, &gfh.fh_val, gfh.fh_len, &np, LK_EXCLUSIVE);
if (error != 0)
goto nfsmout;
newvp = NFSTOV(np);
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, newvp, cnp);
dnp->n_flag |= NMODIFIED;
dnp->n_attrstamp = 0;
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
/* XXX */
/*FREE(cnp->cn_pnbuf, M_NAMEI);*/
if (error != 0 && newvp != NULL)
vput(newvp);
else if (error == 0)
*vpp = newvp;
return (error);
}
static int
nfs4_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen,
struct vnode *tdvp, const char *tnameptr, int tnamelen,
struct ucred *cred, struct thread *td)
{
struct nfsnode *fnp = VTONFS(fdvp), *tnp = VTONFS(tdvp);
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_compound cp;
struct nfs4_oparg_rename r;
int error = 0;
nfsstats.rpccnt[NFSPROC_RENAME]++;
r.fname = fnameptr;
r.fnamelen = fnamelen;
r.tname = tnameptr;
r.tnamelen = tnamelen;
nfs_v4initcompound(&cp);
mreq = nfsm_reqhead(fdvp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(&cp, "nfs4_renamerpc()");
nfsm_v4build_putfh(&cp, fdvp);
nfsm_v4build_savefh(&cp);
nfsm_v4build_putfh(&cp, tdvp);
nfsm_v4build_rename(&cp, &r);
nfsm_v4build_finalize(&cp);
nfsm_request(fdvp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_savefh(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_rename(&cp);
/* XXX should this always be performed? */
fnp->n_flag |= NMODIFIED;
tnp->n_flag |= NMODIFIED;
fnp->n_attrstamp = tnp->n_attrstamp = 0;
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
return (error);
}
/*
* nfs file create call
*/
static int
nfs4_create(struct vop_create_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct nfsnode *dnp = VTONFS(dvp);
struct componentname *cnp = ap->a_cnp;
struct vnode *newvp = NULL;
int error = 0, fmode = (O_CREAT | FREAD | FWRITE);
struct vattr vattr;
if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred, cnp->cn_thread)) != 0)
return (error);
if (vap->va_vaflags & VA_EXCLUSIVE)
fmode |= O_EXCL;
error = nfs4_openrpc(dvp, &newvp, cnp, fmode, vap);
if (error != 0)
goto out;
VTONFS(newvp)->n_flag |= NCREATED;
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
dnp->n_flag |= NMODIFIED;
dnp->n_attrstamp = 0; /* XXX; wccflag */
out:
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 nfs4_sillyrename() to set it up
* else
* do the remove rpc
*/
static int
nfs4_remove(struct vop_remove_args *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 & HASBUF) == 0)
panic("nfs4_remove: no name");
if (vrefcnt(vp) < 1)
panic("nfs4_remove: bad v_usecount");
#endif
if (vp->v_type == VDIR)
error = EPERM;
else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
VOP_GETATTR(vp, &vattr, cnp->cn_cred, cnp->cn_thread) == 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_thread, 1);
/* Do the rpc */
if (error != EINTR)
error = nfs4_removerpc(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread);
/*
* 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 = nfs4_sillyrename(dvp, vp, cnp);
np->n_attrstamp = 0;
return (error);
}
/*
* nfs file remove rpc called from nfs_inactive
*/
int
nfs4_removeit(struct sillyrename *sp)
{
/*
* Make sure that the directory vnode is still valid.
* XXX we should lock sp->s_dvp here.
*/
if (sp->s_dvp->v_type == VBAD)
return (0);
return (nfs4_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
NULL));
}
/*
* Nfs remove rpc, called from nfs4_remove() and nfs4_removeit().
*/
static int
nfs4_removerpc(struct vnode *dvp, const char *name, int namelen,
struct ucred *cred, struct thread *td)
{
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_compound cp;
nfsstats.rpccnt[NFSPROC_REMOVE]++;
mreq = nfsm_reqhead(dvp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_removerpc()");
nfsm_v4build_putfh(&cp, dvp);
nfsm_v4build_remove(&cp, name, namelen);
nfsm_v4build_finalize(&cp);
nfsm_request(dvp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_remove(&cp);
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
VTONFS(dvp)->n_flag |= NMODIFIED;
VTONFS(dvp)->n_attrstamp = 0; /* XXX wccflag */
return (error);
}
/*
* nfs file rename call
*/
static int
nfs4_rename(struct vop_rename_args *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 & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("nfs4_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;
}
if (fvp == tvp) {
printf("nfs4_rename: fvp == tvp (can't happen)\n");
error = 0;
goto out;
}
if ((error = vn_lock(fvp, LK_EXCLUSIVE, fcnp->cn_thread)) != 0)
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_thread);
VOP_UNLOCK(fvp, 0, fcnp->cn_thread);
if (tvp)
VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread);
/*
* 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 && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
tvp->v_type != VDIR && !nfs4_sillyrename(tdvp, tvp, tcnp)) {
vput(tvp);
tvp = NULL;
}
error = nfs4_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
tcnp->cn_thread);
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 nfs4_remove() above
*/
static int
nfs4_renameit(struct vnode *sdvp, struct componentname *scnp,
struct sillyrename *sp)
{
return (nfs4_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp,
sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread));
}
/*
* nfs hard link create call
*/
static int
nfs4_link(struct vop_link_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode *tdvp = ap->a_tdvp;
struct componentname *cnp = ap->a_cnp;
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_compound cp;
struct nfs4_oparg_link l;
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_thread);
nfsstats.rpccnt[NFSPROC_LINK]++;
l.name = cnp->cn_nameptr;
l.namelen = cnp->cn_namelen;
nfs_v4initcompound(&cp);
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_v4build_compound(&cp, "nfs4_link()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_savefh(&cp);
nfsm_v4build_putfh(&cp, tdvp);
nfsm_v4build_link(&cp, &l);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, cnp->cn_thread, cnp->cn_cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_savefh(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_link(&cp);
VTONFS(tdvp)->n_flag |= NMODIFIED;
VTONFS(vp)->n_attrstamp = 0;
VTONFS(tdvp)->n_attrstamp = 0;
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
return (error);
}
/*
* nfs symbolic link create call
*/
static int
nfs4_symlink(struct vop_symlink_args *ap)
{
struct vnode *dvp = ap->a_dvp;
int error = 0;
struct vnode *newvp = NULL;
nfsstats.rpccnt[NFSPROC_SYMLINK]++;
error = nfs4_createrpc(ap->a_dvp, &newvp, ap->a_cnp, NFLNK,
ap->a_vap, ap->a_target);
if (error != 0 && newvp != NULL)
vput(newvp);
else if (error == 0)
*ap->a_vpp = newvp;
VTONFS(dvp)->n_flag |= NMODIFIED;
VTONFS(dvp)->n_attrstamp = 0; /* XXX wccflags */
return (error);
}
/*
* nfs make dir call
*/
static int
nfs4_mkdir(struct vop_mkdir_args *ap)
{
return (nfs4_createrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, NFDIR,
ap->a_vap, NULL));
}
/*
* nfs remove directory call
*/
static int
nfs4_rmdir(struct vop_rmdir_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct nfsnode *dnp = VTONFS(dvp);
struct componentname *cnp = ap->a_cnp;
int error = 0;
if (dvp == vp)
return (EINVAL);
error = (nfs4_removerpc(dvp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_cred,
NULL));
if (error)
return (error);
dnp->n_flag |= NMODIFIED;
dnp->n_attrstamp = 0;
cache_purge(dvp);
cache_purge(vp);
return (error);
}
/*
* nfs readdir call
*/
static int
nfs4_readdir(struct vop_readdir_args *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 (VOP_GETATTR(vp, &vattr, ap->a_cred, uio->uio_td) == 0 &&
!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
nfsstats.direofcache_hits++;
return (0);
}
}
/*
* Call nfs_bioread() to do the real work.
*/
tresid = uio->uio_resid;
error = nfs_bioread(vp, uio, 0, ap->a_cred);
if (!error && uio->uio_resid == tresid)
nfsstats.direofcache_misses++;
return (error);
}
static u_char fty_to_dty[] = {
DT_UNKNOWN, /* NFNON */
DT_REG, /* NFREG */
DT_DIR, /* NFDIR */
DT_BLK, /* NFBLK */
DT_CHR, /* NFCHR */
DT_LNK, /* NFLNK */
DT_SOCK, /* NFSOCK */
DT_FIFO, /* NFFIFO */
DT_UNKNOWN, /* NFATTRDIT */
DT_UNKNOWN, /* NFNAMEDATTR */
DT_UNKNOWN, /* NFBAD */
};
/*
* Readdir rpc call.
* Called from below the buffer cache by nfs_doio().
*/
int
nfs4_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
{
int len, left;
struct dirent *dp = NULL;
u_int32_t *tl;
caddr_t p;
uint64_t *cookiep;
caddr_t bpos, dpos;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
uint64_t cookie;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
struct nfsnode *dnp = VTONFS(vp);
int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1;
struct nfs4_compound cp;
struct nfs4_oparg_readdir readdir;
struct nfsv4_fattr fattr;
u_int fty;
#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 = nfs4_getcookie(dnp, uiop->uio_offset, 0);
if (cookiep)
cookie = *cookiep;
else
return (NFSERR_BAD_COOKIE);
/* Generate fake entries for "." and ".." */
while (cookie < 2 && bigenough) {
cookie++;
len = 4 + DIRHDSIZ;
if (len > uiop->uio_resid) {
bigenough = 0;
break;
}
dp = (struct dirent *)uiop->uio_iov->iov_base;
dp->d_namlen = cookie;
dp->d_reclen = len;
dp->d_type = DT_DIR;
if (cookie == 1)
dp->d_fileno = dnp->n_vattr.va_fileid; /* XXX has problems with pynfs virtualhandles */
else
dp->d_fileno = dnp->n_dvp != NULL ?
VTONFS(dnp->n_dvp)->n_vattr.va_fileid : cookie;
p = dp->d_name;
*p++ = '.';
if (cookie == 2)
*p++ = '.';
*p = '\0';
blksiz += len;
if (blksiz == DIRBLKSIZ)
blksiz = 0;
uiop->uio_offset += len;
uiop->uio_resid -= len;
uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + len;
uiop->uio_iov->iov_len -= len;
}
if (cookie == 2)
cookie = 0;
/* This is sort of ugly, to prevent v4postop() from acting weird */
bzero(&cp, sizeof(cp));
/*
* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of DIRBLKSIZ.
* The stopping criteria is EOF or buffer full.
*/
/*
* XXX this is sort of ugly for nfsv4; we don't maintain the
* strict abstraction, but do the decoding inline. that's ok.
*/
while (more_dirs && bigenough) {
nfsstats.rpccnt[NFSPROC_READDIR]++;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
readdir.cnt = nmp->nm_readdirsize;
readdir.cookie = cookie;
readdir.bm = &nfsv4_readdirbm;
if (cookie == 0)
bzero(&readdir.verf, sizeof(readdir.verf));
else
bcopy(&dnp->n_cookieverf, &readdir.verf,
sizeof(readdir.verf));
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_readdirrpc()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_readdir(&cp, &readdir);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, uiop->uio_td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
/*
* XXX - Readdir gets handled inline like in
* NFSv{2,3}. This is a nasty inconsistency and
* should be fixed.
*/
tl = nfsm_dissect(uint32_t *, 5 * NFSX_UNSIGNED);
if (fxdr_unsigned(uint32_t, *tl++) != NFSV4OP_READDIR) {
error = EBADRPC;
goto nfsmout;
}
if (fxdr_unsigned(uint32_t, *tl++) != 0) {
error = EBADRPC;
goto nfsmout;
}
bcopy(tl, &dnp->n_cookieverf, NFSX_V4VERF);
tl += 2;
more_dirs = fxdr_unsigned(int, *tl++);
/* loop thru the dir entries, doctoring them to 4bsd form */
while (more_dirs && bigenough) {
tl = nfsm_dissect(uint32_t *, 3 * NFSX_UNSIGNED);
cookie = fxdr_hyper(tl);
tl += 2;
/* XXX cookie sanity check */
len = fxdr_unsigned(int, *tl++);
if (len <= 0 || len > NFS_MAXNAMLEN) {
error = EBADRPC;
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 =
(char *)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_namlen = len;
dp->d_reclen = tlen + DIRHDSIZ;
blksiz += dp->d_reclen;
if (blksiz == DIRBLKSIZ)
blksiz = 0;
uiop->uio_offset += DIRHDSIZ;
uiop->uio_resid -= DIRHDSIZ;
uiop->uio_iov->iov_base =
(char *)uiop->uio_iov->iov_base + DIRHDSIZ;
uiop->uio_iov->iov_len -= DIRHDSIZ;
/* Copy name */
nfsm_mtouio(uiop, len);
p = uiop->uio_iov->iov_base;
tlen -= len;
*p = '\0'; /* null terminate */
/* printf("nfs4_readdirrpc: name: \"%s\" cookie %d\n",
p - len, (int) cookie);*/
uiop->uio_iov->iov_base =
(char *)uiop->uio_iov->iov_base + tlen;
uiop->uio_iov->iov_len -= tlen;
uiop->uio_offset += tlen;
uiop->uio_resid -= tlen;
/* Copy attributes */
nfsm_v4dissect_attrs(&fattr);
dp->d_fileno = nfs_v4fileid4_to_fileid(
fattr.fa4_valid & FA4V_FILEID &&
fattr.fa4_fileid ?
fattr.fa4_fileid : cookie);
fty = (u_int)fattr.fa4_type;
dp->d_type = fattr.fa4_valid & FA4V_TYPE &&
(fty < sizeof(fty_to_dty)) ?
fty_to_dty[fty] : DT_UNKNOWN;
} else
nfsm_adv(nfsm_rndup(len));
tl = nfsm_dissect(uint32_t *, NFSX_UNSIGNED);
more_dirs = fxdr_unsigned(int, *tl++);
}
/*
* If at end of rpc data, get the eof boolean
*/
if (!more_dirs) {
tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
more_dirs = (fxdr_unsigned(int, *tl) == 0);
}
error = nfs_v4postop(&cp, error);
m_freem(mrep);
mrep = NULL;
}
/*
* 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 =
(char *)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 = nfs4_getcookie(dnp, uiop->uio_offset, 1);
*cookiep = cookie;
}
nfsmout:
if (mrep != NULL)
m_freem(mrep);
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
nfs4_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
{
struct sillyrename *sp;
struct nfsnode *np;
int error;
short pid;
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 = crhold(cnp->cn_cred);
sp->s_dvp = dvp;
sp->s_removeit = nfs4_removeit;
VREF(dvp);
/* Fudge together a funny name */
pid = cnp->cn_thread->td_proc->p_pid;
sp->s_namlen = sprintf(sp->s_name, ".nfsA%04x4.4", pid);
/* Try lookitups until we get one that isn't there */
while (nfs4_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
cnp->cn_thread, NULL) == 0) {
sp->s_name[4]++;
if (sp->s_name[4] > 'z') {
error = EINVAL;
goto bad;
}
}
error = nfs4_renameit(dvp, cnp, sp);
if (error)
goto bad;
error = nfs4_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
cnp->cn_thread, &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
nfs4_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred,
struct thread *td, struct nfsnode **npp)
{
struct vnode *newvp = NULL;
struct nfsnode *np, *dnp = VTONFS(dvp);
caddr_t bpos, dpos;
int error = 0, fhlen;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
nfsfh_t *nfhp;
struct nfs4_compound cp;
struct nfs4_oparg_lookup l;
struct nfs4_oparg_getfh gfh;
struct nfs4_oparg_getattr ga;
nfsstats.rpccnt[NFSPROC_RENAME]++;
mreq = nfsm_reqhead(dvp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
l.name = name;
l.namelen = len;
nfs_v4initcompound(&cp);
ga.bm = &nfsv4_getattrbm;
nfsm_v4build_compound(&cp, "nfs4_renamerpc()");
nfsm_v4build_putfh(&cp, dvp);
nfsm_v4build_lookup(&cp, &l);
nfsm_v4build_getfh(&cp, &gfh);
nfsm_v4build_getattr(&cp, &ga);
nfsm_request(dvp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_lookup(&cp);
nfsm_v4dissect_getfh(&cp, &gfh);
nfsm_v4dissect_getattr(&cp, &ga);
if (npp != NULL && error == 0) {
nfhp = &gfh.fh_val;
fhlen = gfh.fh_len;
if (*npp != NULL) {
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, LK_EXCLUSIVE);
if (error) {
m_freem(mrep);
return (error);
}
newvp = NFSTOV(np);
}
if (newvp != dvp) {
np->n_dvp = dvp;
np->n_namelen = len;
if (np->n_name != NULL)
FREE(np->n_name, M_NFSREQ);
MALLOC(np->n_name, u_char *,
np->n_namelen + 1, M_NFSREQ, M_WAITOK);
memcpy(np->n_name, name, len);
np->n_name[len] = '\0';
}
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
}
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep != NULL)
m_freem(mrep);
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
nfs4_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
struct thread *td)
{
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
caddr_t bpos, dpos;
int error = 0;
struct mbuf *mreq, *mrep = NULL, *md, *mb;
struct nfs4_compound cp;
struct nfs4_oparg_commit commit;
if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0)
return (0);
nfsstats.rpccnt[NFSPROC_COMMIT]++;
mreq = nfsm_reqhead(vp, NFSV4PROC_COMPOUND, 0);
mb = mreq;
bpos = mtod(mb, caddr_t);
commit.start = offset;
commit.len = cnt;
nfs_v4initcompound(&cp);
nfsm_v4build_compound(&cp, "nfs4_commit()");
nfsm_v4build_putfh(&cp, vp);
nfsm_v4build_commit(&cp, &commit);
nfsm_v4build_finalize(&cp);
nfsm_request(vp, NFSV4PROC_COMPOUND, td, cred);
if (error != 0)
goto nfsmout;
nfsm_v4dissect_compound(&cp);
nfsm_v4dissect_putfh(&cp);
nfsm_v4dissect_commit(&cp, &commit);
/* XXX */
/* nfsm_wcc_data(vp, wccflag);*/
if (bcmp(nmp->nm_verf, commit.verf, NFSX_V4VERF)) {
bcopy(commit.verf, nmp->nm_verf, NFSX_V4VERF);
error = NFSERR_STALEWRITEVERF;
}
nfsmout:
error = nfs_v4postop(&cp, error);
if (mrep == NULL)
m_freem(mrep);
return (error);
}
/*
* 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
nfs4_strategy(struct vop_strategy_args *ap)
{
struct buf *bp = ap->a_bp;
struct ucred *cr;
int error = 0;
KASSERT(!(bp->b_flags & B_DONE), ("nfs4_strategy: buffer %p unexpectedly marked B_DONE", bp));
KASSERT(BUF_REFCNT(bp) > 0, ("nfs4_strategy: buffer %p not locked", bp));
if (bp->b_iocmd == BIO_READ)
cr = bp->b_rcred;
else
cr = bp->b_wcred;
/*
* 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(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread))
error = nfs_doio(ap->a_vp, bp, cr, curthread);
return (error);
}
/*
* fsync vnode op. Just call nfs4_flush() with commit == 1.
*/
/* ARGSUSED */
static int
nfs4_fsync(struct vop_fsync_args *ap)
{
return (nfs4_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
nfs4_flush(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 ucred* wcred = NULL;
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();
if (bvec != NULL && bvec != bvec_on_stack)
free(bvec, M_TEMP);
/*
* Count up how many buffers waiting for a commit.
*/
bveccount = 0;
VI_LOCK(vp);
TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
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 nfs4_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 (bveccount > NFS_COMMITBVECSIZ) {
/*
* Release the vnode interlock to avoid a lock
* order reversal.
*/
VI_UNLOCK(vp);
bvec = (struct buf **)
malloc(bveccount * sizeof(struct buf *),
M_TEMP, M_NOWAIT);
VI_LOCK(vp);
if (bvec == NULL) {
bvec = bvec_on_stack;
bvecsize = NFS_COMMITBVECSIZ;
} else
bvecsize = bveccount;
} else {
bvec = bvec_on_stack;
bvecsize = NFS_COMMITBVECSIZ;
}
TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
if (bvecpos >= bvecsize)
break;
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
nbp = TAILQ_NEXT(bp, b_bobufs);
continue;
}
if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
(B_DELWRI | B_NEEDCOMMIT)) {
BUF_UNLOCK(bp);
nbp = TAILQ_NEXT(bp, b_bobufs);
continue;
}
VI_UNLOCK(vp);
bremfree(bp);
/*
* Work out if all buffers are using the same cred
* so we can deal with them all with one commit.
*
* 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.
*/
if (wcred == NULL)
wcred = bp->b_wcred;
else if (wcred != bp->b_wcred)
wcred = NOCRED;
vfs_busy_pages(bp, 1);
VI_LOCK(vp);
/*
* 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_bobufs);
/*
* 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);
VI_UNLOCK(vp);
}
if (bvecpos > 0) {
/*
* Commit data on the server, as required.
* If all bufs are using the same wcred, then use that with
* one call for all of them, otherwise commit each one
* separately.
*/
if (wcred != NOCRED)
retv = nfs4_commit(vp, off, (int)(endoff - off),
wcred, td);
else {
retv = 0;
for (i = 0; i < bvecpos; i++) {
off_t off, size;
bp = bvec[i];
off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
bp->b_dirtyoff;
size = (u_quad_t)(bp->b_dirtyend
- bp->b_dirtyoff);
retv = nfs4_commit(vp, off, (int)size,
bp->b_wcred, td);
if (retv) break;
}
}
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_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();
bufobj_wref(&vp->v_bufobj);
bp->b_flags |= B_ASYNC;
bundirty(bp);
bp->b_flags &= ~B_DONE;
bp->b_ioflags &= ~BIO_ERROR;
bp->b_dirtyoff = bp->b_dirtyend = 0;
splx(s);
bufdone(bp);
}
}
}
/*
* Start/do any write(s) that are required.
*/
loop:
s = splbio();
VI_LOCK(vp);
TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
if (waitfor != MNT_WAIT || passone)
continue;
error = BUF_TIMELOCK(bp,
LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
VI_MTX(vp), "nfsfsync", slpflag, slptimeo);
splx(s);
if (error == 0)
panic("nfs4_fsync: inconsistent lock");
if (error == ENOLCK)
goto loop;
if (nfs4_sigintr(nmp, NULL, td)) {
error = EINTR;
goto done;
}
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
goto loop;
}
if ((bp->b_flags & B_DELWRI) == 0)
panic("nfs4_fsync: not dirty");
if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
BUF_UNLOCK(bp);
continue;
}
VI_UNLOCK(vp);
bremfree(bp);
if (passone || !commit)
bp->b_flags |= B_ASYNC;
else
bp->b_flags |= B_ASYNC;
splx(s);
bwrite(bp);
goto loop;
}
splx(s);
if (passone) {
passone = 0;
VI_UNLOCK(vp);
goto again;
}
if (waitfor == MNT_WAIT) {
while (vp->v_bufobj.bo_numoutput) {
error = bufobj_wwait(&vp->v_bufobj, slpflag, slptimeo);
if (error) {
VI_UNLOCK(vp);
if (nfs4_sigintr(nmp, NULL, td)) {
error = EINTR;
goto done;
}
if (slpflag == PCATCH) {
slpflag = 0;
slptimeo = 2 * hz;
}
VI_LOCK(vp);
}
}
if (vp->v_bufobj.bo_dirty.bv_cnt > 0 && commit) {
VI_UNLOCK(vp);
goto loop;
}
}
VI_UNLOCK(vp);
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.
*/
static int
nfs4_advlock(struct vop_advlock_args *ap)
{
return (EPERM);
if ((VFSTONFS(ap->a_vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
struct nfsnode *np = VTONFS(ap->a_vp);
return (lf_advlock(ap, &(np->n_lockf), np->n_size));
}
return (nfs_dolock(ap));
}
/*
* Print out the contents of an nfsnode.
*/
static int
nfs4_print(struct vop_print_args *ap)
{
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
printf("\tfileid %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);
}
/*
* This is the "real" nfs::bwrite(struct buf*).
* We set B_CACHE if this is a VMIO buffer.
*/
int
nfs4_writebp(struct buf *bp, int force __unused, 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_DONE;
bp->b_ioflags &= ~BIO_ERROR;
bp->b_iocmd = BIO_WRITE;
bufobj_wref(bp->b_bufobj);
curthread->td_proc->p_stats->p_ru.ru_oublock++;
splx(s);
/*
* Note: to avoid loopback deadlocks, we do not
* assign b_runningbufspace.
*/
vfs_busy_pages(bp, 1);
BUF_KERNPROC(bp);
bp->b_iooffset = dbtob(bp->b_blkno);
bstrategy(bp);
if( (oldflags & B_ASYNC) == 0) {
int rtval = bufwait(bp);
if (oldflags & B_DELWRI) {
s = splbio();
reassignbuf(bp);
splx(s);
}
brelse(bp);
return (rtval);
}
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
nfs4_bwrite(struct buf *bp)
{
return (nfs4_writebp(bp, 1, curthread));
}
struct buf_ops buf_ops_nfs4 = {
.bop_name = "buf_ops_nfs4",
.bop_write = nfs4_bwrite,
.bop_strategy = bufstrategy,
.bop_sync = bufsync,
};
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