d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
8dba90be16
freebsd-skq/sys/nfs4client/nfs4_vnops.c

2952 lines
71 KiB
C
Raw Blame History

/* $FreeBSD$ */
/* $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);
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) {
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, ap->a_td);
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
VOP_UNLOCK(vp, 0, ap->a_td);
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 lockparent, wantparent, 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;
cnp->cn_flags &= ~PDIRUNLOCK;
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);
lockparent = flags & LOCKPARENT;
wantparent = flags & (LOCKPARENT|WANTPARENT);
nmp = VFSTONFS(dvp->v_mount);
np = VTONFS(dvp);
isdot = cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.';
if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) {
struct vattr vattr;
int vpid;
if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) {
*vpp = NULLVP;
return (error);
}
vhold(*vpp);
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 & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
error = vget(newvp, LK_EXCLUSIVE, td);
if (!error && lockparent && (flags & ISLASTCN)) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error == 0)
cnp->cn_flags &= ~PDIRUNLOCK;
}
} else {
error = vget(newvp, LK_EXCLUSIVE, td);
if (!lockparent || error || !(flags & ISLASTCN)) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
}
if (!error) {
if (vpid == newvp->v_id) {
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;
vdrop(newvp);
return (0);
}
cache_purge(newvp);
}
vput(newvp);
if (lockparent && dvp != newvp && (flags & ISLASTCN))
VOP_UNLOCK(dvp, 0, td);
}
vdrop(newvp);
error = vn_lock(dvp, LK_EXCLUSIVE, td);
*vpp = NULLVP;
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
return (error);
}
cnp->cn_flags &= ~PDIRUNLOCK;
}
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 && wantparent && (flags & ISLASTCN)) {
if (NFS_CMPFH(np, fhp, fhsize))
return (EISDIR);
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error)
return (error);
newvp = NFSTOV(np);
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
*vpp = newvp;
cnp->cn_flags |= SAVENAME;
if (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
return (0);
}
if (flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0, td);
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error) {
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
return (error);
}
newvp = NFSTOV(np);
nfs4_vnop_loadattrcache(newvp, &ga.fa, NULL);
if (lockparent && (flags & ISLASTCN)) {
error = vn_lock(dvp, LK_EXCLUSIVE, td);
if (error) {
cnp->cn_flags |= PDIRUNLOCK;
vput(newvp);
return (error);
}
} else
cnp->cn_flags |= PDIRUNLOCK;
} else if (NFS_CMPFH(np, fhp, fhsize)) {
VREF(dvp);
newvp = dvp;
} else {
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error)
return (error);
if (!lockparent || !(flags & ISLASTCN)) {
cnp->cn_flags |= PDIRUNLOCK;
VOP_UNLOCK(dvp, 0, td);
}
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 (!lockparent) {
VOP_UNLOCK(dvp, 0, td);
cnp->cn_flags |= PDIRUNLOCK;
}
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 (m_freem != 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);
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 &&
np->n_mtime.tv_sec == 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, 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);
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;
struct thread *td;
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_flags & B_ASYNC)
td = NULL;
else
td = curthread; /* XXX */
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, td))
error = nfs_doio(ap->a_vp, bp, cr, td);
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,
};
Reference in New Issue View Git Blame Copy Permalink