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nfs_vnops.c
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nfs_vnops.c
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/* $NetBSD: nfs_vnops.c,v 1.252 2007/03/04 06:03:38 christos Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 8.19 (Berkeley) 7/31/95
*/
/*
* vnode op calls for Sun NFS version 2 and 3
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_vnops.c,v 1.252 2007/03/04 06:03:38 christos Exp $");
#include "opt_inet.h"
#include "opt_nfs.h"
#include "opt_uvmhist.h"
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/disk.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/hash.h>
#include <sys/lockf.h>
#include <sys/stat.h>
#include <sys/unistd.h>
#include <sys/kauth.h>
#include <uvm/uvm_extern.h>
#include <uvm/uvm.h>
#include <miscfs/fifofs/fifo.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/genfs/genfs_node.h>
#include <miscfs/specfs/specdev.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfs_var.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
/*
* Global vfs data structures for nfs
*/
int (**nfsv2_vnodeop_p) __P((void *));
const struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, nfs_lookup }, /* lookup */
{ &vop_create_desc, nfs_create }, /* create */
{ &vop_mknod_desc, nfs_mknod }, /* mknod */
{ &vop_open_desc, nfs_open }, /* open */
{ &vop_close_desc, nfs_close }, /* close */
{ &vop_access_desc, nfs_access }, /* access */
{ &vop_getattr_desc, nfs_getattr }, /* getattr */
{ &vop_setattr_desc, nfs_setattr }, /* setattr */
{ &vop_read_desc, nfs_read }, /* read */
{ &vop_write_desc, nfs_write }, /* write */
{ &vop_lease_desc, nfs_lease_check }, /* lease */
{ &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
{ &vop_ioctl_desc, nfs_ioctl }, /* ioctl */
{ &vop_poll_desc, nfs_poll }, /* poll */
{ &vop_kqfilter_desc, nfs_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, nfs_revoke }, /* revoke */
{ &vop_mmap_desc, nfs_mmap }, /* mmap */
{ &vop_fsync_desc, nfs_fsync }, /* fsync */
{ &vop_seek_desc, nfs_seek }, /* seek */
{ &vop_remove_desc, nfs_remove }, /* remove */
{ &vop_link_desc, nfs_link }, /* link */
{ &vop_rename_desc, nfs_rename }, /* rename */
{ &vop_mkdir_desc, nfs_mkdir }, /* mkdir */
{ &vop_rmdir_desc, nfs_rmdir }, /* rmdir */
{ &vop_symlink_desc, nfs_symlink }, /* symlink */
{ &vop_readdir_desc, nfs_readdir }, /* readdir */
{ &vop_readlink_desc, nfs_readlink }, /* readlink */
{ &vop_abortop_desc, nfs_abortop }, /* abortop */
{ &vop_inactive_desc, nfs_inactive }, /* inactive */
{ &vop_reclaim_desc, nfs_reclaim }, /* reclaim */
{ &vop_lock_desc, nfs_lock }, /* lock */
{ &vop_unlock_desc, nfs_unlock }, /* unlock */
{ &vop_bmap_desc, nfs_bmap }, /* bmap */
{ &vop_strategy_desc, nfs_strategy }, /* strategy */
{ &vop_print_desc, nfs_print }, /* print */
{ &vop_islocked_desc, nfs_islocked }, /* islocked */
{ &vop_pathconf_desc, nfs_pathconf }, /* pathconf */
{ &vop_advlock_desc, nfs_advlock }, /* advlock */
{ &vop_bwrite_desc, genfs_badop }, /* bwrite */
{ &vop_getpages_desc, nfs_getpages }, /* getpages */
{ &vop_putpages_desc, genfs_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc nfsv2_vnodeop_opv_desc =
{ &nfsv2_vnodeop_p, nfsv2_vnodeop_entries };
/*
* Special device vnode ops
*/
int (**spec_nfsv2nodeop_p) __P((void *));
const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, spec_lookup }, /* lookup */
{ &vop_create_desc, spec_create }, /* create */
{ &vop_mknod_desc, spec_mknod }, /* mknod */
{ &vop_open_desc, spec_open }, /* open */
{ &vop_close_desc, nfsspec_close }, /* close */
{ &vop_access_desc, nfsspec_access }, /* access */
{ &vop_getattr_desc, nfs_getattr }, /* getattr */
{ &vop_setattr_desc, nfs_setattr }, /* setattr */
{ &vop_read_desc, nfsspec_read }, /* read */
{ &vop_write_desc, nfsspec_write }, /* write */
{ &vop_lease_desc, spec_lease_check }, /* lease */
{ &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
{ &vop_ioctl_desc, spec_ioctl }, /* ioctl */
{ &vop_poll_desc, spec_poll }, /* poll */
{ &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, spec_revoke }, /* revoke */
{ &vop_mmap_desc, spec_mmap }, /* mmap */
{ &vop_fsync_desc, spec_fsync }, /* fsync */
{ &vop_seek_desc, spec_seek }, /* seek */
{ &vop_remove_desc, spec_remove }, /* remove */
{ &vop_link_desc, spec_link }, /* link */
{ &vop_rename_desc, spec_rename }, /* rename */
{ &vop_mkdir_desc, spec_mkdir }, /* mkdir */
{ &vop_rmdir_desc, spec_rmdir }, /* rmdir */
{ &vop_symlink_desc, spec_symlink }, /* symlink */
{ &vop_readdir_desc, spec_readdir }, /* readdir */
{ &vop_readlink_desc, spec_readlink }, /* readlink */
{ &vop_abortop_desc, spec_abortop }, /* abortop */
{ &vop_inactive_desc, nfs_inactive }, /* inactive */
{ &vop_reclaim_desc, nfs_reclaim }, /* reclaim */
{ &vop_lock_desc, nfs_lock }, /* lock */
{ &vop_unlock_desc, nfs_unlock }, /* unlock */
{ &vop_bmap_desc, spec_bmap }, /* bmap */
{ &vop_strategy_desc, spec_strategy }, /* strategy */
{ &vop_print_desc, nfs_print }, /* print */
{ &vop_islocked_desc, nfs_islocked }, /* islocked */
{ &vop_pathconf_desc, spec_pathconf }, /* pathconf */
{ &vop_advlock_desc, spec_advlock }, /* advlock */
{ &vop_bwrite_desc, spec_bwrite }, /* bwrite */
{ &vop_getpages_desc, spec_getpages }, /* getpages */
{ &vop_putpages_desc, spec_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc =
{ &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries };
int (**fifo_nfsv2nodeop_p) __P((void *));
const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, fifo_lookup }, /* lookup */
{ &vop_create_desc, fifo_create }, /* create */
{ &vop_mknod_desc, fifo_mknod }, /* mknod */
{ &vop_open_desc, fifo_open }, /* open */
{ &vop_close_desc, nfsfifo_close }, /* close */
{ &vop_access_desc, nfsspec_access }, /* access */
{ &vop_getattr_desc, nfs_getattr }, /* getattr */
{ &vop_setattr_desc, nfs_setattr }, /* setattr */
{ &vop_read_desc, nfsfifo_read }, /* read */
{ &vop_write_desc, nfsfifo_write }, /* write */
{ &vop_lease_desc, fifo_lease_check }, /* lease */
{ &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
{ &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
{ &vop_poll_desc, fifo_poll }, /* poll */
{ &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, fifo_revoke }, /* revoke */
{ &vop_mmap_desc, fifo_mmap }, /* mmap */
{ &vop_fsync_desc, nfs_fsync }, /* fsync */
{ &vop_seek_desc, fifo_seek }, /* seek */
{ &vop_remove_desc, fifo_remove }, /* remove */
{ &vop_link_desc, fifo_link }, /* link */
{ &vop_rename_desc, fifo_rename }, /* rename */
{ &vop_mkdir_desc, fifo_mkdir }, /* mkdir */
{ &vop_rmdir_desc, fifo_rmdir }, /* rmdir */
{ &vop_symlink_desc, fifo_symlink }, /* symlink */
{ &vop_readdir_desc, fifo_readdir }, /* readdir */
{ &vop_readlink_desc, fifo_readlink }, /* readlink */
{ &vop_abortop_desc, fifo_abortop }, /* abortop */
{ &vop_inactive_desc, nfs_inactive }, /* inactive */
{ &vop_reclaim_desc, nfs_reclaim }, /* reclaim */
{ &vop_lock_desc, nfs_lock }, /* lock */
{ &vop_unlock_desc, nfs_unlock }, /* unlock */
{ &vop_bmap_desc, fifo_bmap }, /* bmap */
{ &vop_strategy_desc, genfs_badop }, /* strategy */
{ &vop_print_desc, nfs_print }, /* print */
{ &vop_islocked_desc, nfs_islocked }, /* islocked */
{ &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
{ &vop_advlock_desc, fifo_advlock }, /* advlock */
{ &vop_bwrite_desc, genfs_badop }, /* bwrite */
{ &vop_putpages_desc, fifo_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc =
{ &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries };
static int nfs_linkrpc(struct vnode *, struct vnode *, const char *,
size_t, kauth_cred_t, struct lwp *);
static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *);
/*
* Global variables
*/
extern u_int32_t nfs_true, nfs_false;
extern u_int32_t nfs_xdrneg1;
extern const nfstype nfsv3_type[9];
int nfs_numasync = 0;
#define DIRHDSIZ _DIRENT_NAMEOFF(dp)
#define UIO_ADVANCE(uio, siz) \
(void)((uio)->uio_resid -= (siz), \
(uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \
(uio)->uio_iov->iov_len -= (siz))
static void nfs_cache_enter(struct vnode *, struct vnode *,
struct componentname *);
static void
nfs_cache_enter(struct vnode *dvp, struct vnode *vp,
struct componentname *cnp)
{
struct nfsnode *dnp = VTONFS(dvp);
if (vp != NULL) {
struct nfsnode *np = VTONFS(vp);
np->n_ctime = np->n_vattr->va_ctime.tv_sec;
}
if (!timespecisset(&dnp->n_nctime))
dnp->n_nctime = dnp->n_vattr->va_mtime;
cache_enter(dvp, vp, cnp);
}
/*
* nfs null call from vfs.
*/
int
nfs_null(vp, cred, l)
struct vnode *vp;
kauth_cred_t cred;
struct lwp *l;
{
char *bpos, *dpos;
int error = 0;
struct mbuf *mreq, *mrep, *md, *mb;
struct nfsnode *np = VTONFS(vp);
nfsm_reqhead(np, NFSPROC_NULL, 0);
nfsm_request(np, NFSPROC_NULL, l, cred);
nfsm_reqdone;
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.
*/
int
nfs_access(v)
void *v;
{
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
#ifndef NFS_V2_ONLY
u_int32_t *tl;
char *cp;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
int error = 0, attrflag;
struct mbuf *mreq, *mrep, *md, *mb;
u_int32_t mode, rmode;
const int v3 = NFS_ISV3(vp);
#endif
int cachevalid;
struct nfsnode *np = VTONFS(vp);
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
cachevalid = (np->n_accstamp != -1 &&
(time_uptime - np->n_accstamp) < NFS_ATTRTIMEO(nmp, np) &&
np->n_accuid == kauth_cred_geteuid(ap->a_cred));
/*
* Check access cache first. If this request has been made for this
* uid shortly before, use the cached result.
*/
if (cachevalid) {
if (!np->n_accerror) {
if ((np->n_accmode & ap->a_mode) == ap->a_mode)
return np->n_accerror;
} else if ((np->n_accmode & ap->a_mode) == np->n_accmode)
return np->n_accerror;
}
#ifndef NFS_V2_ONLY
/*
* For nfs v3, 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, but
* this is better than just returning anything that is lying about
* in the cache.
*/
if (v3) {
nfsstats.rpccnt[NFSPROC_ACCESS]++;
nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED);
nfsm_fhtom(np, v3);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
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;
}
*tl = txdr_unsigned(mode);
nfsm_request(np, NFSPROC_ACCESS, ap->a_l, ap->a_cred);
nfsm_postop_attr(vp, attrflag, 0);
if (!error) {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
rmode = fxdr_unsigned(u_int32_t, *tl);
/*
* The NFS V3 spec does not clarify whether or not
* the returned access bits can be a superset of
* the ones requested, so...
*/
if ((rmode & mode) != mode)
error = EACCES;
}
nfsm_reqdone;
} else
#endif
return (nfsspec_access(ap));
#ifndef NFS_V2_ONLY
/*
* 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 (!error && (ap->a_mode & VWRITE) &&
(vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (vp->v_type) {
case VREG:
case VDIR:
case VLNK:
error = EROFS;
default:
break;
}
}
if (!error || error == EACCES) {
/*
* If we got the same result as for a previous,
* different request, OR it in. Don't update
* the timestamp in that case.
*/
if (cachevalid && np->n_accstamp != -1 &&
error == np->n_accerror) {
if (!error)
np->n_accmode |= ap->a_mode;
else if ((np->n_accmode & ap->a_mode) == ap->a_mode)
np->n_accmode = ap->a_mode;
} else {
np->n_accstamp = time_uptime;
np->n_accuid = kauth_cred_geteuid(ap->a_cred);
np->n_accmode = ap->a_mode;
np->n_accerror = error;
}
}
return (error);
#endif
}
/*
* 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 */
int
nfs_open(v)
void *v;
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
int error;
if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) {
return (EACCES);
}
if (ap->a_mode & FREAD) {
if (np->n_rcred != NULL)
kauth_cred_free(np->n_rcred);
np->n_rcred = ap->a_cred;
kauth_cred_hold(np->n_rcred);
}
if (ap->a_mode & FWRITE) {
if (np->n_wcred != NULL)
kauth_cred_free(np->n_wcred);
np->n_wcred = ap->a_cred;
kauth_cred_hold(np->n_wcred);
}
error = nfs_flushstalebuf(vp, ap->a_cred, ap->a_l, 0);
if (error)
return error;
NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */
return (0);
}
/*
* nfs close vnode op
* What an NFS client should do upon close after writing is a debatable issue.
* Most NFS clients push delayed writes to the server upon close, basically for
* two reasons:
* 1 - So that any write errors may be reported back to the client process
* doing the close system call. By far the two most likely errors are
* NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
* 2 - To put a worst case upper bound on cache inconsistency between
* multiple clients for the file.
* There is also a consistency problem for Version 2 of the protocol w.r.t.
* not being able to tell if other clients are writing a file concurrently,
* since there is no way of knowing if the changed modify time in the reply
* is only due to the write for this client.
* (NFS Version 3 provides weak cache consistency data in the reply that
* should be sufficient to detect and handle this case.)
*
* The current code does the following:
* for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
* for NFS Version 3 - flush dirty buffers to the server but don't invalidate
* or commit them (this satisfies 1 and 2 except for the
* case where the server crashes after this close but
* before the commit RPC, which is felt to be "good
* enough". Changing the last argument to nfs_flush() to
* a 1 would force a commit operation, if it is felt a
* commit is necessary now.
*/
/* ARGSUSED */
int
nfs_close(v)
void *v;
{
struct vop_close_args /* {
struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
int error = 0;
UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist);
if (vp->v_type == VREG) {
if (np->n_flag & NMODIFIED) {
#ifndef NFS_V2_ONLY
if (NFS_ISV3(vp)) {
error = nfs_flush(vp, ap->a_cred, MNT_WAIT, ap->a_l, 0);
np->n_flag &= ~NMODIFIED;
} else
#endif
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_l, 1);
NFS_INVALIDATE_ATTRCACHE(np);
}
if (np->n_flag & NWRITEERR) {
np->n_flag &= ~NWRITEERR;
error = np->n_error;
}
}
UVMHIST_LOG(ubchist, "returning %d", error,0,0,0);
return (error);
}
/*
* nfs getattr call from vfs.
*/
int
nfs_getattr(v)
void *v;
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
char *cp;
u_int32_t *tl;
int32_t t1, t2;
char *bpos, *dpos;
int error = 0;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(vp);
/*
* Update local times for special files.
*/
if (np->n_flag & (NACC | NUPD))
np->n_flag |= NCHG;
/*
* if we have delayed truncation, do it now.
*/
nfs_delayedtruncate(vp);
/*
* First look in the cache.
*/
if (nfs_getattrcache(vp, ap->a_vap) == 0)
return (0);
nfsstats.rpccnt[NFSPROC_GETATTR]++;
nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3));
nfsm_fhtom(np, v3);
nfsm_request(np, NFSPROC_GETATTR, ap->a_l, ap->a_cred);
if (!error) {
nfsm_loadattr(vp, ap->a_vap, 0);
if (vp->v_type == VDIR &&
ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ)
ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ;
}
nfsm_reqdone;
return (error);
}
/*
* nfs setattr call.
*/
int
nfs_setattr(v)
void *v;
{
struct vop_setattr_args /* {
struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
struct vattr *vap = ap->a_vap;
int error = 0;
u_quad_t tsize = 0;
/*
* 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_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);
genfs_node_wrlock(vp);
uvm_vnp_setsize(vp, vap->va_size);
tsize = np->n_size;
np->n_size = vap->va_size;
if (vap->va_size == 0)
error = nfs_vinvalbuf(vp, 0,
ap->a_cred, ap->a_l, 1);
else
error = nfs_vinvalbuf(vp, V_SAVE,
ap->a_cred, ap->a_l, 1);
if (error) {
uvm_vnp_setsize(vp, tsize);
genfs_node_unlock(vp);
return (error);
}
np->n_vattr->va_size = vap->va_size;
}
} else {
/*
* flush files before setattr because a later write of
* cached data might change timestamps or reset sugid bits
*/
if ((vap->va_mtime.tv_sec != VNOVAL ||
vap->va_atime.tv_sec != VNOVAL ||
vap->va_mode != VNOVAL) &&
vp->v_type == VREG &&
(error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred,
ap->a_l, 1)) == EINTR)
return (error);
}
error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_l);
if (vap->va_size != VNOVAL) {
if (error) {
np->n_size = np->n_vattr->va_size = tsize;
uvm_vnp_setsize(vp, np->n_size);
}
genfs_node_unlock(vp);
}
VN_KNOTE(vp, NOTE_ATTRIB);
return (error);
}
/*
* Do an nfs setattr rpc.
*/
int
nfs_setattrrpc(vp, vap, cred, l)
struct vnode *vp;
struct vattr *vap;
kauth_cred_t cred;
struct lwp *l;
{
struct nfsv2_sattr *sp;
char *cp;
int32_t t1, t2;
char *bpos, *dpos;
u_int32_t *tl;
int error = 0;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(vp);
struct nfsnode *np = VTONFS(vp);
#ifndef NFS_V2_ONLY
int wccflag = NFSV3_WCCRATTR;
char *cp2;
#endif
nfsstats.rpccnt[NFSPROC_SETATTR]++;
nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3));
nfsm_fhtom(np, v3);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_v3attrbuild(vap, true);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl = nfs_false;
} else {
#endif
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
if (vap->va_mode == (mode_t)VNOVAL)
sp->sa_mode = nfs_xdrneg1;
else
sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode);
if (vap->va_uid == (uid_t)VNOVAL)
sp->sa_uid = nfs_xdrneg1;
else
sp->sa_uid = txdr_unsigned(vap->va_uid);
if (vap->va_gid == (gid_t)VNOVAL)
sp->sa_gid = nfs_xdrneg1;
else
sp->sa_gid = txdr_unsigned(vap->va_gid);
sp->sa_size = txdr_unsigned(vap->va_size);
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
#ifndef NFS_V2_ONLY
}
#endif
nfsm_request(np, NFSPROC_SETATTR, l, cred);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false);
} else
#endif
nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC);
nfsm_reqdone;
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
*
* This code is full of lock/unlock statements and checks, because
* we continue after cache_lookup has finished (we need to check
* with the attr cache and do an rpc if it has timed out). This means
* that the locking effects of cache_lookup have to be taken into
* account.
*/
int
nfs_lookup(v)
void *v;
{
struct vop_lookup_args /* {
struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *ap = v;
struct componentname *cnp = ap->a_cnp;
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
int flags;
struct vnode *newvp;
u_int32_t *tl;
char *cp;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
struct mbuf *mreq, *mrep, *md, *mb;
long len;
nfsfh_t *fhp;
struct nfsnode *np;
int error = 0, attrflag, fhsize;
const int v3 = NFS_ISV3(dvp);
flags = cnp->cn_flags;
*vpp = NULLVP;
newvp = 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);
/*
* RFC1813(nfsv3) 3.2 says clients should handle "." by themselves.
*/
if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp);
if (error)
return error;
if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN))
return EISDIR;
VREF(dvp);
*vpp = dvp;
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
return 0;
}
np = VTONFS(dvp);
/*
* Before tediously performing a linear scan of the directory,
* check the name cache to see if the directory/name pair
* we are looking for is known already.
* If the directory/name pair is found in the name cache,
* we have to ensure the directory has not changed from
* the time the cache entry has been created. If it has,
* the cache entry has to be ignored.
*/
error = cache_lookup_raw(dvp, vpp, cnp);
KASSERT(dvp != *vpp);
if (error >= 0) {
struct vattr vattr;
int err2;
if (error && error != ENOENT) {
*vpp = NULLVP;
return error;
}
err2 = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_lwp);
if (err2 != 0) {
if (error == 0)
vrele(*vpp);
*vpp = NULLVP;
return err2;
}
if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred,
cnp->cn_lwp) || timespeccmp(&vattr.va_mtime,
&VTONFS(dvp)->n_nctime, !=)) {
if (error == 0) {
vrele(*vpp);
*vpp = NULLVP;
}
cache_purge1(dvp, NULL, PURGE_CHILDREN);
timespecclear(&np->n_nctime);
goto dorpc;
}
if (error == ENOENT) {
goto noentry;
}
newvp = *vpp;
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred, cnp->cn_lwp)
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
nfsstats.lookupcache_hits++;
if ((flags & ISDOTDOT) != 0) {
VOP_UNLOCK(dvp, 0);
}
error = vn_lock(newvp, LK_EXCLUSIVE);
if ((flags & ISDOTDOT) != 0) {
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
}
if (error) {
/* newvp has been revoked. */
vrele(newvp);
*vpp = NULL;
return error;
}
if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN))
cnp->cn_flags |= SAVENAME;
KASSERT(newvp->v_type != VNON);
return (0);
}
cache_purge1(newvp, NULL, PURGE_PARENTS);
vrele(newvp);
*vpp = NULLVP;
}
dorpc:
#if 0
/*
* because nfsv3 has the same CREATE semantics as ours,
* we don't have to perform LOOKUPs beforehand.
*
* XXX ideally we can do the same for nfsv2 in the case of !O_EXCL.
* XXX although we have no way to know if O_EXCL is requested or not.
*/
if (v3 && cnp->cn_nameiop == CREATE &&
(flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN &&
(dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
cnp->cn_flags |= SAVENAME;
return (EJUSTRETURN);
}
#endif /* 0 */
error = 0;
newvp = NULLVP;
nfsstats.lookupcache_misses++;
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
len = cnp->cn_namelen;
nfsm_reqhead(np, NFSPROC_LOOKUP,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
nfsm_fhtom(np, v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
nfsm_request(np, NFSPROC_LOOKUP, cnp->cn_lwp, cnp->cn_cred);
if (error) {
nfsm_postop_attr(dvp, attrflag, 0);
m_freem(mrep);
goto nfsmout;
}
nfsm_getfh(fhp, fhsize, v3);
/*
* Handle RENAME case...
*/
if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
if (NFS_CMPFH(np, fhp, fhsize)) {
m_freem(mrep);
return (EISDIR);
}
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
if (error) {
m_freem(mrep);
return error;
}
newvp = NFSTOV(np);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_postop_attr(newvp, attrflag, 0);
nfsm_postop_attr(dvp, attrflag, 0);
} else
#endif
nfsm_loadattr(newvp, (struct vattr *)0, 0);
*vpp = newvp;
m_freem(mrep);
cnp->cn_flags |= SAVENAME;
goto validate;
}
/*
* The postop attr handling is duplicated for each if case,
* because it should be done while dvp is locked (unlocking
* dvp is different for each case).
*/
if (NFS_CMPFH(np, fhp, fhsize)) {
/*
* "." lookup
*/
VREF(dvp);
newvp = dvp;
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_postop_attr(newvp, attrflag, 0);
nfsm_postop_attr(dvp, attrflag, 0);
} else
#endif
nfsm_loadattr(newvp, (struct vattr *)0, 0);
} else if (flags & ISDOTDOT) {
/*
* ".." lookup
*/
VOP_UNLOCK(dvp, 0);
error = nfs_nget(dvp->v_mount, fhp, fhsize, &np);
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
if (error) {
m_freem(mrep);
return error;
}
newvp = NFSTOV(np);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_postop_attr(newvp, attrflag, 0);
nfsm_postop_attr(dvp, attrflag, 0);
} else
#endif
nfsm_loadattr(newvp, (struct vattr *)0, 0);