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NetBSD/sys/nfs/nfs_vnops.c

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/* $NetBSD: nfs_vnops.c,v 1.304 2014/02/07 15:29:22 hannken 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 1.304 2014/02/07 15:29:22 hannken Exp $");
#ifdef _KERNEL_OPT
#include "opt_nfs.h"
#include "opt_uvmhist.h"
#endif
#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/condvar.h>
#include <sys/disk.h>
#include <sys/malloc.h>
#include <sys/kmem.h>
#include <sys/mbuf.h>
#include <sys/mutex.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 <sys/cprng.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)(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_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)(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_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)(void *);
const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, vn_fifo_bypass }, /* lookup */
{ &vop_create_desc, vn_fifo_bypass }, /* create */
{ &vop_mknod_desc, vn_fifo_bypass }, /* mknod */
{ &vop_open_desc, vn_fifo_bypass }, /* 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_fcntl_desc, genfs_fcntl }, /* fcntl */
{ &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */
{ &vop_poll_desc, vn_fifo_bypass }, /* poll */
{ &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */
{ &vop_revoke_desc, vn_fifo_bypass }, /* revoke */
{ &vop_mmap_desc, vn_fifo_bypass }, /* mmap */
{ &vop_fsync_desc, nfs_fsync }, /* fsync */
{ &vop_seek_desc, vn_fifo_bypass }, /* seek */
{ &vop_remove_desc, vn_fifo_bypass }, /* remove */
{ &vop_link_desc, vn_fifo_bypass }, /* link */
{ &vop_rename_desc, vn_fifo_bypass }, /* rename */
{ &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */
{ &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */
{ &vop_symlink_desc, vn_fifo_bypass }, /* symlink */
{ &vop_readdir_desc, vn_fifo_bypass }, /* readdir */
{ &vop_readlink_desc, vn_fifo_bypass }, /* readlink */
{ &vop_abortop_desc, vn_fifo_bypass }, /* 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, vn_fifo_bypass }, /* bmap */
{ &vop_strategy_desc, genfs_badop }, /* strategy */
{ &vop_print_desc, nfs_print }, /* print */
{ &vop_islocked_desc, nfs_islocked }, /* islocked */
{ &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */
{ &vop_advlock_desc, vn_fifo_bypass }, /* advlock */
{ &vop_bwrite_desc, genfs_badop }, /* bwrite */
{ &vop_putpages_desc, vn_fifo_bypass }, /* 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 ((cnp->cn_flags & MAKEENTRY) == 0) {
return;
}
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->cn_nameptr, cnp->cn_namelen, cnp->cn_flags);
}
/*
* nfs null call from vfs.
*/
int
nfs_null(struct vnode *vp, kauth_cred_t cred, struct lwp *l)
{
char *bpos, *dpos;
int error = 0;
struct mbuf *mreq, *mrep, *md, *mb __unused;
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(void *v)
{
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *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, curlwp, 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(void *v)
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *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, curlwp, 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(void *v)
{
struct vop_close_args /* {
struct vnodeop_desc *a_desc;
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
} */ *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, curlwp, 0);
np->n_flag &= ~NMODIFIED;
} else
#endif
error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 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(void *v)
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *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, curlwp, 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(void *v)
{
struct vop_setattr_args /* {
struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *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) {
if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) {
return EFBIG;
}
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, curlwp, 1);
else
error = nfs_vinvalbuf(vp, V_SAVE,
ap->a_cred, curlwp, 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,
curlwp, 1)) == EINTR)
return (error);
}
error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp);
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(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, do the rpc.
*/
int
nfs_lookup(void *v)
{
struct vop_lookup_v2_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 cachefound;
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);
if (error)
return error;
if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN))
return EISDIR;
vref(dvp);
*vpp = dvp;
return 0;
}
np = VTONFS(dvp);
/*
* Before performing an RPC, 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.
*/
cachefound = cache_lookup_raw(dvp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_flags, NULL, vpp);
KASSERT(dvp != *vpp);
KASSERT((cnp->cn_flags & ISWHITEOUT) == 0);
if (cachefound) {
struct vattr vattr;
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred);
if (error != 0) {
if (*vpp != NULLVP)
vrele(*vpp);
*vpp = NULLVP;
return error;
}
if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred)
|| timespeccmp(&vattr.va_mtime,
&VTONFS(dvp)->n_nctime, !=)) {
if (*vpp != NULLVP) {
vrele(*vpp);
*vpp = NULLVP;
}
cache_purge1(dvp, NULL, 0, PURGE_CHILDREN);
timespecclear(&np->n_nctime);
goto dorpc;
}
if (*vpp == NULLVP) {
/* namecache gave us a negative result */
error = ENOENT;
goto noentry;
}
/*
* investigate the vnode returned by cache_lookup_raw.
* if it isn't appropriate, do an rpc.
*/
newvp = *vpp;
if ((flags & ISDOTDOT) != 0) {
VOP_UNLOCK(dvp);
}
error = vn_lock(newvp, LK_SHARED);
if ((flags & ISDOTDOT) != 0) {
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
}
if (error != 0) {
/* newvp has been reclaimed. */
vrele(newvp);
*vpp = NULLVP;
goto dorpc;
}
if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred)
&& vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) {
nfsstats.lookupcache_hits++;
KASSERT(newvp->v_type != VNON);
VOP_UNLOCK(newvp);
return (0);
}
cache_purge1(newvp, NULL, 0, PURGE_PARENTS);
vput(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) {
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, curlwp, 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);
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)) {
/*
* as we handle "." lookup locally, this should be
* a broken server.
*/
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);
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);
} else {
/*
* Other lookups.
*/
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);
}
if (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) {
nfs_cache_enter(dvp, newvp, cnp);
}
*vpp = newvp;
nfsm_reqdone;
if (error) {
/*
* We get here only because of errors returned by
* the RPC. Otherwise we'll have returned above
* (the nfsm_* macros will jump to nfsm_reqdone
* on error).
*/
if (error == ENOENT && cnp->cn_nameiop != CREATE) {
nfs_cache_enter(dvp, NULL, cnp);
}
if (newvp != NULLVP) {
if (newvp == dvp) {
vrele(newvp);
} else {
vput(newvp);
}
}
noentry:
if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
(flags & ISLASTCN) && error == ENOENT) {
if (dvp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
} else {
error = EJUSTRETURN;
}
}
*vpp = NULL;
return error;
}
validate:
/*
* make sure we have valid type and size.
*/
newvp = *vpp;
if (newvp->v_type == VNON) {
struct vattr vattr; /* dummy */
KASSERT(VTONFS(newvp)->n_attrstamp == 0);
error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred);
if (error) {
vput(newvp);
*vpp = NULL;
}
}
if (error)
return error;
if (newvp != dvp)
VOP_UNLOCK(newvp);
return 0;
}
/*
* nfs read call.
* Just call nfs_bioread() to do the work.
*/
int
nfs_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
if (vp->v_type != VREG)
return EISDIR;
return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0));
}
/*
* nfs readlink call
*/
int
nfs_readlink(void *v)
{
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
if (vp->v_type != VLNK)
return (EPERM);
if (np->n_rcred != NULL) {
kauth_cred_free(np->n_rcred);
}
np->n_rcred = ap->a_cred;
kauth_cred_hold(np->n_rcred);
return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0));
}
/*
* Do a readlink rpc.
* Called by nfs_doio() from below the buffer cache.
*/
int
nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred)
{
u_int32_t *tl;
char *cp;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
int error = 0;
uint32_t len;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(vp);
struct nfsnode *np = VTONFS(vp);
#ifndef NFS_V2_ONLY
int attrflag;
#endif
nfsstats.rpccnt[NFSPROC_READLINK]++;
nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3));
nfsm_fhtom(np, v3);
nfsm_request(np, NFSPROC_READLINK, curlwp, cred);
#ifndef NFS_V2_ONLY
if (v3)
nfsm_postop_attr(vp, attrflag, 0);
#endif
if (!error) {
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED);
len = fxdr_unsigned(uint32_t, *tl);
if (len > NFS_MAXPATHLEN) {
/*
* this pathname is too long for us.
*/
m_freem(mrep);
/* Solaris returns EINVAL. should we follow? */
error = ENAMETOOLONG;
goto nfsmout;
}
} else
#endif
{
nfsm_strsiz(len, NFS_MAXPATHLEN);
}
nfsm_mtouio(uiop, len);
}
nfsm_reqdone;
return (error);
}
/*
* nfs read rpc call
* Ditto above
*/
int
nfs_readrpc(struct vnode *vp, struct uio *uiop)
{
u_int32_t *tl;
char *cp;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
struct mbuf *mreq, *mrep, *md, *mb;
struct nfsmount *nmp;
int error = 0, len, retlen, tsiz, eof __unused, byte_count;
const int v3 = NFS_ISV3(vp);
struct nfsnode *np = VTONFS(vp);
#ifndef NFS_V2_ONLY
int attrflag;
#endif
#ifndef nolint
eof = 0;
#endif
nmp = VFSTONFS(vp->v_mount);
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
return (EFBIG);
iostat_busy(nmp->nm_stats);
byte_count = 0; /* count bytes actually transferred */
while (tsiz > 0) {
nfsstats.rpccnt[NFSPROC_READ]++;
len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz;
nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3);
nfsm_fhtom(np, v3);
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3);
#ifndef NFS_V2_ONLY
if (v3) {
txdr_hyper(uiop->uio_offset, tl);
*(tl + 2) = txdr_unsigned(len);
} else
#endif
{
*tl++ = txdr_unsigned(uiop->uio_offset);
*tl++ = txdr_unsigned(len);
*tl = 0;
}
nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC);
if (error) {
m_freem(mrep);
goto nfsmout;
}
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
eof = fxdr_unsigned(int, *(tl + 1));
} else
#endif
nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC);
nfsm_strsiz(retlen, nmp->nm_rsize);
nfsm_mtouio(uiop, retlen);
m_freem(mrep);
tsiz -= retlen;
byte_count += retlen;
#ifndef NFS_V2_ONLY
if (v3) {
if (eof || retlen == 0)
tsiz = 0;
} else
#endif
if (retlen < len)
tsiz = 0;
}
nfsmout:
iostat_unbusy(nmp->nm_stats, byte_count, 1);
return (error);
}
struct nfs_writerpc_context {
kmutex_t nwc_lock;
kcondvar_t nwc_cv;
int nwc_mbufcount;
};
/*
* free mbuf used to refer protected pages while write rpc call.
* called at splvm.
*/
static void
nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg)
{
struct nfs_writerpc_context *ctx = arg;
KASSERT(m != NULL);
KASSERT(ctx != NULL);
pool_cache_put(mb_cache, m);
mutex_enter(&ctx->nwc_lock);
if (--ctx->nwc_mbufcount == 0) {
cv_signal(&ctx->nwc_cv);
}
mutex_exit(&ctx->nwc_lock);
}
/*
* nfs write call
*/
int
nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, bool pageprotected, bool *stalewriteverfp)
{
u_int32_t *tl;
char *cp;
int32_t t1, t2;
char *bpos, *dpos;
struct mbuf *mreq, *mrep, *md, *mb;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR;
const int v3 = NFS_ISV3(vp);
int committed = NFSV3WRITE_FILESYNC;
struct nfsnode *np = VTONFS(vp);
struct nfs_writerpc_context ctx;
int byte_count;
size_t origresid;
#ifndef NFS_V2_ONLY
char *cp2;
int rlen, commit;
#endif
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
panic("writerpc readonly vp %p", vp);
}
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1)
panic("nfs: writerpc iovcnt > 1");
#endif
tsiz = uiop->uio_resid;
if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
return EFBIG;
mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM);
cv_init(&ctx.nwc_cv, "nfsmblk");
ctx.nwc_mbufcount = 1;
retry:
origresid = uiop->uio_resid;
KASSERT(origresid == uiop->uio_iov->iov_len);
iostat_busy(nmp->nm_stats);
byte_count = 0; /* count of bytes actually written */
while (tsiz > 0) {
uint32_t datalen; /* data bytes need to be allocated in mbuf */
uint32_t backup;
bool stalewriteverf = false;
nfsstats.rpccnt[NFSPROC_WRITE]++;
len = min(tsiz, nmp->nm_wsize);
datalen = pageprotected ? 0 : nfsm_rndup(len);
nfsm_reqhead(np, NFSPROC_WRITE,
NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen);
nfsm_fhtom(np, v3);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
txdr_hyper(uiop->uio_offset, tl);
tl += 2;
*tl++ = txdr_unsigned(len);
*tl++ = txdr_unsigned(*iomode);
*tl = txdr_unsigned(len);
} else
#endif
{
u_int32_t x;
nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
/* Set both "begin" and "current" to non-garbage. */
x = txdr_unsigned((u_int32_t)uiop->uio_offset);
*tl++ = x; /* "begin offset" */
*tl++ = x; /* "current offset" */
x = txdr_unsigned(len);
*tl++ = x; /* total to this offset */
*tl = x; /* size of this write */
}
if (pageprotected) {
/*
* since we know pages can't be modified during i/o,
* no need to copy them for us.
*/
struct mbuf *m;
struct iovec *iovp = uiop->uio_iov;
m = m_get(M_WAIT, MT_DATA);
MCLAIM(m, &nfs_mowner);
MEXTADD(m, iovp->iov_base, len, M_MBUF,
nfs_writerpc_extfree, &ctx);
m->m_flags |= M_EXT_ROMAP;
m->m_len = len;
mb->m_next = m;
/*
* no need to maintain mb and bpos here
* because no one care them later.
*/
#if 0
mb = m;
bpos = mtod(void *, mb) + mb->m_len;
#endif
UIO_ADVANCE(uiop, len);
uiop->uio_offset += len;
mutex_enter(&ctx.nwc_lock);
ctx.nwc_mbufcount++;
mutex_exit(&ctx.nwc_lock);
nfs_zeropad(mb, 0, nfsm_padlen(len));
} else {
nfsm_uiotom(uiop, len);
}
nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred);
#ifndef NFS_V2_ONLY
if (v3) {
wccflag = NFSV3_WCCCHK;
nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error);
if (!error) {
nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED
+ NFSX_V3WRITEVERF);
rlen = fxdr_unsigned(int, *tl++);
if (rlen == 0) {
error = NFSERR_IO;
m_freem(mrep);
break;
} else if (rlen < len) {
backup = len - rlen;
UIO_ADVANCE(uiop, -backup);
uiop->uio_offset -= backup;
len = rlen;
}
commit = fxdr_unsigned(int, *tl++);
/*
* Return the lowest committment level
* obtained by any of the RPCs.
*/
if (committed == NFSV3WRITE_FILESYNC)
committed = commit;
else if (committed == NFSV3WRITE_DATASYNC &&
commit == NFSV3WRITE_UNSTABLE)
committed = commit;
mutex_enter(&nmp->nm_lock);
if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){
memcpy(nmp->nm_writeverf, tl,
NFSX_V3WRITEVERF);
nmp->nm_iflag |= NFSMNT_HASWRITEVERF;
} else if ((nmp->nm_iflag &
NFSMNT_STALEWRITEVERF) ||
memcmp(tl, nmp->nm_writeverf,
NFSX_V3WRITEVERF)) {
memcpy(nmp->nm_writeverf, tl,
NFSX_V3WRITEVERF);
/*
* note NFSMNT_STALEWRITEVERF
* if we're the first thread to
* notice it.
*/
if ((nmp->nm_iflag &
NFSMNT_STALEWRITEVERF) == 0) {
stalewriteverf = true;
nmp->nm_iflag |=
NFSMNT_STALEWRITEVERF;
}
}
mutex_exit(&nmp->nm_lock);
}
} else
#endif
nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC);
if (wccflag)
VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime;
m_freem(mrep);
if (error)
break;
tsiz -= len;
byte_count += len;
if (stalewriteverf) {
*stalewriteverfp = true;
stalewriteverf = false;
if (committed == NFSV3WRITE_UNSTABLE &&
len != origresid) {
/*
* if our write requests weren't atomic but
* unstable, datas in previous iterations
* might have already been lost now.
* then, we should resend them to nfsd.
*/
backup = origresid - tsiz;
UIO_ADVANCE(uiop, -backup);
uiop->uio_offset -= backup;
tsiz = origresid;
goto retry;
}
}
}
nfsmout:
iostat_unbusy(nmp->nm_stats, byte_count, 0);
if (pageprotected) {
/*
* wait until mbufs go away.
* retransmitted mbufs can survive longer than rpc requests
* themselves.
*/
mutex_enter(&ctx.nwc_lock);
ctx.nwc_mbufcount--;
while (ctx.nwc_mbufcount > 0) {
cv_wait(&ctx.nwc_cv, &ctx.nwc_lock);
}
mutex_exit(&ctx.nwc_lock);
}
mutex_destroy(&ctx.nwc_lock);
cv_destroy(&ctx.nwc_cv);
*iomode = committed;
if (error)
uiop->uio_resid = tsiz;
return (error);
}
/*
* nfs mknod rpc
* For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
* mode set to specify the file type and the size field for rdev.
*/
int
nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap)
{
struct nfsv2_sattr *sp;
u_int32_t *tl;
char *cp;
int32_t t1, t2;
struct vnode *newvp = (struct vnode *)0;
struct nfsnode *dnp, *np;
char *cp2;
char *bpos, *dpos;
int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0;
struct mbuf *mreq, *mrep, *md, *mb;
u_int32_t rdev;
const int v3 = NFS_ISV3(dvp);
if (vap->va_type == VCHR || vap->va_type == VBLK)
rdev = txdr_unsigned(vap->va_rdev);
else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
rdev = nfs_xdrneg1;
else {
VOP_ABORTOP(dvp, cnp);
return (EOPNOTSUPP);
}
nfsstats.rpccnt[NFSPROC_MKNOD]++;
dnp = VTONFS(dvp);
nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED +
+ nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
nfsm_fhtom(dnp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
*tl++ = vtonfsv3_type(vap->va_type);
nfsm_v3attrbuild(vap, false);
if (vap->va_type == VCHR || vap->va_type == VBLK) {
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(major(vap->va_rdev));
*tl = txdr_unsigned(minor(vap->va_rdev));
}
} else
#endif
{
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = rdev;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred);
if (!error) {
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (!gotvp) {
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, curlwp, &np);
if (!error)
newvp = NFSTOV(np);
}
}
#ifndef NFS_V2_ONLY
if (v3)
nfsm_wcc_data(dvp, wccflag, 0, !error);
#endif
nfsm_reqdone;
if (error) {
if (newvp)
vput(newvp);
} else {
nfs_cache_enter(dvp, newvp, cnp);
*vpp = newvp;
VOP_UNLOCK(newvp);
}
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
return (error);
}
/*
* nfs mknod vop
* just call nfs_mknodrpc() to do the work.
*/
/* ARGSUSED */
int
nfs_mknod(void *v)
{
struct vop_mknod_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
int error;
error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, ap->a_vap);
VN_KNOTE(dvp, NOTE_WRITE);
if (error == 0 || error == EEXIST)
cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0);
return (error);
}
/*
* nfs file create call
*/
int
nfs_create(void *v)
{
struct vop_create_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
u_int32_t *tl;
char *cp;
int32_t t1, t2;
struct nfsnode *dnp, *np = (struct nfsnode *)0;
struct vnode *newvp = (struct vnode *)0;
char *bpos, *dpos, *cp2;
int error, wccflag = NFSV3_WCCRATTR, gotvp = 0;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(dvp);
u_int32_t excl_mode = NFSV3CREATE_UNCHECKED;
/*
* Oops, not for me..
*/
if (vap->va_type == VSOCK)
return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
KASSERT(vap->va_type == VREG);
#ifdef VA_EXCLUSIVE
if (vap->va_vaflags & VA_EXCLUSIVE) {
excl_mode = NFSV3CREATE_EXCLUSIVE;
}
#endif
again:
error = 0;
nfsstats.rpccnt[NFSPROC_CREATE]++;
dnp = VTONFS(dvp);
nfsm_reqhead(dnp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3));
nfsm_fhtom(dnp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
if (excl_mode == NFSV3CREATE_EXCLUSIVE) {
*tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE);
nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF);
*tl++ = cprng_fast32();
*tl = cprng_fast32();
} else {
*tl = txdr_unsigned(excl_mode);
nfsm_v3attrbuild(vap, false);
}
} else
#endif
{
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = 0;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
nfsm_request(dnp, NFSPROC_CREATE, curlwp, cnp->cn_cred);
if (!error) {
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (!gotvp) {
error = nfs_lookitup(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, curlwp, &np);
if (!error)
newvp = NFSTOV(np);
}
}
#ifndef NFS_V2_ONLY
if (v3)
nfsm_wcc_data(dvp, wccflag, 0, !error);
#endif
nfsm_reqdone;
if (error) {
/*
* nfs_request maps NFSERR_NOTSUPP to ENOTSUP.
*/
if (v3 && error == ENOTSUP) {
if (excl_mode == NFSV3CREATE_EXCLUSIVE) {
excl_mode = NFSV3CREATE_GUARDED;
goto again;
} else if (excl_mode == NFSV3CREATE_GUARDED) {
excl_mode = NFSV3CREATE_UNCHECKED;
goto again;
}
}
} else if (v3 && (excl_mode == NFSV3CREATE_EXCLUSIVE)) {
struct timespec ts;
getnanotime(&ts);
/*
* make sure that we'll update timestamps as
* most server implementations use them to store
* the create verifier.
*
* XXX it's better to use TOSERVER always.
*/
if (vap->va_atime.tv_sec == VNOVAL)
vap->va_atime = ts;
if (vap->va_mtime.tv_sec == VNOVAL)
vap->va_mtime = ts;
error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, curlwp);
}
if (error == 0) {
if (cnp->cn_flags & MAKEENTRY)
nfs_cache_enter(dvp, newvp, cnp);
else
cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0);
*ap->a_vpp = newvp;
VOP_UNLOCK(newvp);
} else {
if (newvp)
vput(newvp);
if (error == EEXIST)
cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0);
}
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
return (error);
}
/*
* nfs file remove call
* To try and make nfs semantics closer to ufs semantics, a file that has
* other processes using the vnode is renamed instead of removed and then
* removed later on the last close.
* - If v_usecount > 1
* If a rename is not already in the works
* call nfs_sillyrename() to set it up
* else
* do the remove rpc
*/
int
nfs_remove(void *v)
{
struct vop_remove_args /* {
struct vnodeop_desc *a_desc;
struct vnode * a_dvp;
struct vnode * a_vp;
struct componentname * a_cnp;
} */ *ap = v;
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 (vp->v_usecount < 1)
panic("nfs_remove: bad v_usecount");
#endif
if (vp->v_type == VDIR)
error = EPERM;
else if (vp->v_usecount == 1 || (np->n_sillyrename &&
VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 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_cred, curlwp, 1);
/* Do the rpc */
if (error != EINTR)
error = nfs_removerpc(dvp, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_cred, curlwp);
} else if (!np->n_sillyrename)
error = nfs_sillyrename(dvp, vp, cnp, false);
if (!error && nfs_getattrcache(vp, &vattr) == 0 &&
vattr.va_nlink == 1) {
np->n_flag |= NREMOVED;
}
NFS_INVALIDATE_ATTRCACHE(np);
VN_KNOTE(vp, NOTE_DELETE);
VN_KNOTE(dvp, NOTE_WRITE);
if (dvp == vp)
vrele(vp);
else
vput(vp);
vput(dvp);
return (error);
}
/*
* nfs file remove rpc called from nfs_inactive
*/
int
nfs_removeit(struct sillyrename *sp)
{
return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred,
(struct lwp *)0));
}
/*
* Nfs remove rpc, called from nfs_remove() and nfs_removeit().
*/
int
nfs_removerpc(struct vnode *dvp, const char *name, int namelen, kauth_cred_t cred, struct lwp *l)
{
u_int32_t *tl;
char *cp;
#ifndef NFS_V2_ONLY
int32_t t1;
char *cp2;
#endif
int32_t t2;
char *bpos, *dpos;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(dvp);
int rexmit = 0;
struct nfsnode *dnp = VTONFS(dvp);
nfsstats.rpccnt[NFSPROC_REMOVE]++;
nfsm_reqhead(dnp, NFSPROC_REMOVE,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen));
nfsm_fhtom(dnp, v3);
nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit);
#ifndef NFS_V2_ONLY
if (v3)
nfsm_wcc_data(dvp, wccflag, 0, !error);
#endif
nfsm_reqdone;
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
/*
* 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 (rexmit && error == ENOENT)
error = 0;
return (error);
}
/*
* nfs file rename call
*/
int
nfs_rename(void *v)
{
struct vop_rename_args /* {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
} */ *ap = v;
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;
/* Check for cross-device rename */
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
goto out;
}
/*
* If the tvp exists and is in use, sillyrename it before doing the
* rename of the new file over it.
*
* Have sillyrename use link instead of rename if possible,
* so that we don't lose the file if the rename fails, and so
* that there's no window when the "to" file doesn't exist.
*/
if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename &&
tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) {
VN_KNOTE(tvp, NOTE_DELETE);
vput(tvp);
tvp = NULL;
}
error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred,
curlwp);
VN_KNOTE(fdvp, NOTE_WRITE);
VN_KNOTE(tdvp, NOTE_WRITE);
if (error == 0 || error == EEXIST) {
if (fvp->v_type == VDIR)
cache_purge(fvp);
else
cache_purge1(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen,
0);
if (tvp != NULL && tvp->v_type == VDIR)
cache_purge(tvp);
else
cache_purge1(tdvp, tcnp->cn_nameptr, tcnp->cn_namelen,
0);
}
out:
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
vrele(fdvp);
vrele(fvp);
return (error);
}
/*
* nfs file rename rpc called from nfs_remove() above
*/
int
nfs_renameit(struct vnode *sdvp, struct componentname *scnp, struct sillyrename *sp)
{
return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen,
sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp));
}
/*
* Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
*/
int
nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, struct vnode *tdvp, const char *tnameptr, int tnamelen, kauth_cred_t cred, struct lwp *l)
{
u_int32_t *tl;
char *cp;
#ifndef NFS_V2_ONLY
int32_t t1;
char *cp2;
#endif
int32_t t2;
char *bpos, *dpos;
int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(fdvp);
int rexmit = 0;
struct nfsnode *fdnp = VTONFS(fdvp);
nfsstats.rpccnt[NFSPROC_RENAME]++;
nfsm_reqhead(fdnp, NFSPROC_RENAME,
(NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) +
nfsm_rndup(tnamelen));
nfsm_fhtom(fdnp, v3);
nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN);
nfsm_fhtom(VTONFS(tdvp), v3);
nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN);
nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_wcc_data(fdvp, fwccflag, 0, !error);
nfsm_wcc_data(tdvp, twccflag, 0, !error);
}
#endif
nfsm_reqdone;
VTONFS(fdvp)->n_flag |= NMODIFIED;
VTONFS(tdvp)->n_flag |= NMODIFIED;
if (!fwccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp));
if (!twccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp));
/*
* Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
*/
if (rexmit && error == ENOENT)
error = 0;
return (error);
}
/*
* NFS link RPC, called from nfs_link.
* Assumes dvp and vp locked, and leaves them that way.
*/
static int
nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name,
size_t namelen, kauth_cred_t cred, struct lwp *l)
{
u_int32_t *tl;
char *cp;
#ifndef NFS_V2_ONLY
int32_t t1;
char *cp2;
#endif
int32_t t2;
char *bpos, *dpos;
int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(dvp);
int rexmit = 0;
struct nfsnode *np = VTONFS(vp);
nfsstats.rpccnt[NFSPROC_LINK]++;
nfsm_reqhead(np, NFSPROC_LINK,
NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen));
nfsm_fhtom(np, v3);
nfsm_fhtom(VTONFS(dvp), v3);
nfsm_strtom(name, namelen, NFS_MAXNAMLEN);
nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_postop_attr(vp, attrflag, 0);
nfsm_wcc_data(dvp, wccflag, 0, !error);
}
#endif
nfsm_reqdone;
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!attrflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(vp));
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
/*
* Kludge: Map EEXIST => 0 assuming that it is a reply to a retry.
*/
if (rexmit && error == EEXIST)
error = 0;
return error;
}
/*
* nfs hard link create call
*/
int
nfs_link(void *v)
{
struct vop_link_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
int error = 0;
error = vn_lock(vp, LK_EXCLUSIVE);
if (error != 0) {
VOP_ABORTOP(dvp, cnp);
vput(dvp);
return error;
}
/*
* 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, cnp->cn_cred, FSYNC_WAIT, 0, 0);
error = nfs_linkrpc(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_cred, curlwp);
if (error == 0) {
cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0);
}
VOP_UNLOCK(vp);
VN_KNOTE(vp, NOTE_LINK);
VN_KNOTE(dvp, NOTE_WRITE);
vput(dvp);
return (error);
}
/*
* nfs symbolic link create call
*/
int
nfs_symlink(void *v)
{
struct vop_symlink_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
u_int32_t *tl;
char *cp;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp;
struct mbuf *mreq, *mrep, *md, *mb;
struct vnode *newvp = (struct vnode *)0;
const int v3 = NFS_ISV3(dvp);
int rexmit = 0;
struct nfsnode *dnp = VTONFS(dvp);
*ap->a_vpp = NULL;
nfsstats.rpccnt[NFSPROC_SYMLINK]++;
slen = strlen(ap->a_target);
nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED +
nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3));
nfsm_fhtom(dnp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
#ifndef NFS_V2_ONlY
if (v3)
nfsm_v3attrbuild(vap, false);
#endif
nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN);
#ifndef NFS_V2_ONlY
if (!v3) {
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = nfs_xdrneg1;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
#endif
nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred,
&rexmit);
#ifndef NFS_V2_ONlY
if (v3) {
if (!error)
nfsm_mtofh(dvp, newvp, v3, gotvp);
nfsm_wcc_data(dvp, wccflag, 0, !error);
}
#endif
nfsm_reqdone;
/*
* Kludge: Map EEXIST => 0 assuming that it is a reply to a retry.
*/
if (rexmit && error == EEXIST)
error = 0;
if (error == 0 || error == EEXIST)
cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0);
if (error == 0 && newvp == NULL) {
struct nfsnode *np = NULL;
error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_cred, curlwp, &np);
if (error == 0)
newvp = NFSTOV(np);
}
if (error) {
if (newvp != NULL)
vput(newvp);
} else {
*ap->a_vpp = newvp;
VOP_UNLOCK(newvp);
}
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(dvp, NOTE_WRITE);
return (error);
}
/*
* nfs make dir call
*/
int
nfs_mkdir(void *v)
{
struct vop_mkdir_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct nfsv2_sattr *sp;
u_int32_t *tl;
char *cp;
int32_t t1, t2;
int len;
struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0;
struct vnode *newvp = (struct vnode *)0;
char *bpos, *dpos, *cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
int gotvp = 0;
int rexmit = 0;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(dvp);
len = cnp->cn_namelen;
nfsstats.rpccnt[NFSPROC_MKDIR]++;
nfsm_reqhead(dnp, NFSPROC_MKDIR,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3));
nfsm_fhtom(dnp, v3);
nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_v3attrbuild(vap, false);
} else
#endif
{
nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode);
sp->sa_uid = nfs_xdrneg1;
sp->sa_gid = nfs_xdrneg1;
sp->sa_size = nfs_xdrneg1;
txdr_nfsv2time(&vap->va_atime, &sp->sa_atime);
txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime);
}
nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit);
if (!error)
nfsm_mtofh(dvp, newvp, v3, gotvp);
if (v3)
nfsm_wcc_data(dvp, wccflag, 0, !error);
nfsm_reqdone;
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
/*
* Kludge: Map EEXIST => 0 assuming that you have a reply to a retry
* if we can succeed in looking up the directory.
*/
if ((rexmit && error == EEXIST) || (!error && !gotvp)) {
if (newvp) {
vput(newvp);
newvp = (struct vnode *)0;
}
error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred,
curlwp, &np);
if (!error) {
newvp = NFSTOV(np);
if (newvp->v_type != VDIR || newvp == dvp)
error = EEXIST;
}
}
if (error) {
if (newvp) {
if (dvp != newvp)
vput(newvp);
else
vrele(newvp);
}
} else {
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
nfs_cache_enter(dvp, newvp, cnp);
*ap->a_vpp = newvp;
VOP_UNLOCK(newvp);
}
return (error);
}
/*
* nfs remove directory call
*/
int
nfs_rmdir(void *v)
{
struct vop_rmdir_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
u_int32_t *tl;
char *cp;
#ifndef NFS_V2_ONLY
int32_t t1;
char *cp2;
#endif
int32_t t2;
char *bpos, *dpos;
int error = 0, wccflag = NFSV3_WCCRATTR;
int rexmit = 0;
struct mbuf *mreq, *mrep, *md, *mb;
const int v3 = NFS_ISV3(dvp);
struct nfsnode *dnp;
if (dvp == vp) {
vrele(dvp);
vput(dvp);
return (EINVAL);
}
nfsstats.rpccnt[NFSPROC_RMDIR]++;
dnp = VTONFS(dvp);
nfsm_reqhead(dnp, NFSPROC_RMDIR,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen));
nfsm_fhtom(dnp, v3);
nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN);
nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit);
#ifndef NFS_V2_ONLY
if (v3)
nfsm_wcc_data(dvp, wccflag, 0, !error);
#endif
nfsm_reqdone;
VTONFS(dvp)->n_flag |= NMODIFIED;
if (!wccflag)
NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp));
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
VN_KNOTE(vp, NOTE_DELETE);
cache_purge(vp);
vput(vp);
vput(dvp);
/*
* Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
*/
if (rexmit && error == ENOENT)
error = 0;
return (error);
}
/*
* nfs readdir call
*/
int
nfs_readdir(void *v)
{
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
int *a_eofflag;
off_t **a_cookies;
int *a_ncookies;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
char *base = uio->uio_iov->iov_base;
int tresid, error;
size_t count, lost;
struct dirent *dp;
off_t *cookies = NULL;
int ncookies = 0, nc;
if (vp->v_type != VDIR)
return (EPERM);
lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1);
count = uio->uio_resid - lost;
if (count <= 0)
return (EINVAL);
/*
* Call nfs_bioread() to do the real work.
*/
tresid = uio->uio_resid = count;
error = nfs_bioread(vp, uio, 0, ap->a_cred,
ap->a_cookies ? NFSBIO_CACHECOOKIES : 0);
if (!error && ap->a_cookies) {
ncookies = count / 16;
cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK);
*ap->a_cookies = cookies;
}
if (!error && uio->uio_resid == tresid) {
uio->uio_resid += lost;
nfsstats.direofcache_misses++;
if (ap->a_cookies)
*ap->a_ncookies = 0;
*ap->a_eofflag = 1;
return (0);
}
if (!error && ap->a_cookies) {
/*
* Only the NFS server and emulations use cookies, and they
* load the directory block into system space, so we can
* just look at it directly.
*/
if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) ||
uio->uio_iovcnt != 1)
panic("nfs_readdir: lost in space");
for (nc = 0; ncookies-- &&
base < (char *)uio->uio_iov->iov_base; nc++){
dp = (struct dirent *) base;
if (dp->d_reclen == 0)
break;
if (nmp->nm_flag & NFSMNT_XLATECOOKIE)
*(cookies++) = (off_t)NFS_GETCOOKIE32(dp);
else
*(cookies++) = NFS_GETCOOKIE(dp);
base += dp->d_reclen;
}
uio->uio_resid +=
((char *)uio->uio_iov->iov_base - base);
uio->uio_iov->iov_len +=
((char *)uio->uio_iov->iov_base - base);
uio->uio_iov->iov_base = base;
*ap->a_ncookies = nc;
}
uio->uio_resid += lost;
*ap->a_eofflag = 0;
return (error);
}
/*
* Readdir rpc call.
* Called from below the buffer cache by nfs_doio().
*/
int
nfs_readdirrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred)
{
int len, left;
struct dirent *dp = NULL;
u_int32_t *tl;
char *cp;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
struct mbuf *mreq, *mrep, *md, *mb;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
struct nfsnode *dnp = VTONFS(vp);
u_quad_t fileno;
int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1;
#ifndef NFS_V2_ONLY
int attrflag;
#endif
int nrpcs = 0, reclen;
const int v3 = NFS_ISV3(vp);
#ifdef DIAGNOSTIC
/*
* Should be called from buffer cache, so only amount of
* NFS_DIRBLKSIZ will be requested.
*/
if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ)
panic("nfs readdirrpc bad uio");
#endif
/*
* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of NFS_DIRFRAGSIZ.
* The stopping criteria is EOF or buffer full.
*/
while (more_dirs && bigenough) {
/*
* Heuristic: don't bother to do another RPC to further
* fill up this block if there is not much room left. (< 50%
* of the readdir RPC size). This wastes some buffer space
* but can save up to 50% in RPC calls.
*/
if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) {
bigenough = 0;
break;
}
nfsstats.rpccnt[NFSPROC_READDIR]++;
nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) +
NFSX_READDIR(v3));
nfsm_fhtom(dnp, v3);
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) {
txdr_swapcookie3(uiop->uio_offset, tl);
} else {
txdr_cookie3(uiop->uio_offset, tl);
}
tl += 2;
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
} else
#endif
{
nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(uiop->uio_offset);
}
*tl = txdr_unsigned(nmp->nm_readdirsize);
nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred);
nrpcs++;
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_postop_attr(vp, attrflag, 0);
if (!error) {
nfsm_dissect(tl, u_int32_t *,
2 * NFSX_UNSIGNED);
dnp->n_cookieverf.nfsuquad[0] = *tl++;
dnp->n_cookieverf.nfsuquad[1] = *tl;
} else {
m_freem(mrep);
goto nfsmout;
}
}
#endif
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = fxdr_unsigned(int, *tl);
/* loop thru the dir entries, doctoring them to 4bsd form */
while (more_dirs && bigenough) {
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_dissect(tl, u_int32_t *,
3 * NFSX_UNSIGNED);
fileno = fxdr_hyper(tl);
len = fxdr_unsigned(int, *(tl + 2));
} else
#endif
{
nfsm_dissect(tl, u_int32_t *,
2 * NFSX_UNSIGNED);
fileno = fxdr_unsigned(u_quad_t, *tl++);
len = fxdr_unsigned(int, *tl);
}
if (len <= 0 || len > NFS_MAXNAMLEN) {
error = EBADRPC;
m_freem(mrep);
goto nfsmout;
}
/* for cookie stashing */
reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t);
left = NFS_DIRFRAGSIZ - blksiz;
if (reclen > left) {
memset(uiop->uio_iov->iov_base, 0, left);
dp->d_reclen += left;
UIO_ADVANCE(uiop, left);
blksiz = 0;
NFS_STASHCOOKIE(dp, uiop->uio_offset);
}
if (reclen > uiop->uio_resid)
bigenough = 0;
if (bigenough) {
int tlen;
dp = (struct dirent *)uiop->uio_iov->iov_base;
dp->d_fileno = fileno;
dp->d_namlen = len;
dp->d_reclen = reclen;
dp->d_type = DT_UNKNOWN;
blksiz += reclen;
if (blksiz == NFS_DIRFRAGSIZ)
blksiz = 0;
UIO_ADVANCE(uiop, DIRHDSIZ);
nfsm_mtouio(uiop, len);
tlen = reclen - (DIRHDSIZ + len);
(void)memset(uiop->uio_iov->iov_base, 0, tlen);
UIO_ADVANCE(uiop, tlen);
} else
nfsm_adv(nfsm_rndup(len));
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_dissect(tl, u_int32_t *,
3 * NFSX_UNSIGNED);
} else
#endif
{
nfsm_dissect(tl, u_int32_t *,
2 * NFSX_UNSIGNED);
}
if (bigenough) {
#ifndef NFS_V2_ONLY
if (v3) {
if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE)
uiop->uio_offset =
fxdr_swapcookie3(tl);
else
uiop->uio_offset =
fxdr_cookie3(tl);
}
else
#endif
{
uiop->uio_offset =
fxdr_unsigned(off_t, *tl);
}
NFS_STASHCOOKIE(dp, uiop->uio_offset);
}
if (v3)
tl += 2;
else
tl++;
more_dirs = fxdr_unsigned(int, *tl);
}
/*
* If at end of rpc data, get the eof boolean
*/
if (!more_dirs) {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = (fxdr_unsigned(int, *tl) == 0);
/*
* kludge: if we got no entries, treat it as EOF.
* some server sometimes send a reply without any
* entries or EOF.
* although it might mean the server has very long name,
* we can't handle such entries anyway.
*/
if (uiop->uio_resid >= NFS_DIRBLKSIZ)
more_dirs = 0;
}
m_freem(mrep);
}
/*
* Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ
* by increasing d_reclen for the last record.
*/
if (blksiz > 0) {
left = NFS_DIRFRAGSIZ - blksiz;
memset(uiop->uio_iov->iov_base, 0, left);
dp->d_reclen += left;
NFS_STASHCOOKIE(dp, uiop->uio_offset);
UIO_ADVANCE(uiop, left);
}
/*
* We are now either at the end of the directory or have filled the
* block.
*/
if (bigenough) {
dnp->n_direofoffset = uiop->uio_offset;
dnp->n_flag |= NEOFVALID;
}
nfsmout:
return (error);
}
#ifndef NFS_V2_ONLY
/*
* NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc().
*/
int
nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred)
{
int len, left;
struct dirent *dp = NULL;
u_int32_t *tl;
char *cp;
int32_t t1, t2;
struct vnode *newvp;
char *bpos, *dpos, *cp2;
struct mbuf *mreq, *mrep, *md, *mb;
struct nameidata nami, *ndp = &nami;
struct componentname *cnp = &ndp->ni_cnd;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
struct nfsnode *dnp = VTONFS(vp), *np;
nfsfh_t *fhp;
u_quad_t fileno;
int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i;
int attrflag, fhsize, nrpcs = 0, reclen;
struct nfs_fattr fattr, *fp;
#ifdef DIAGNOSTIC
if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ)
panic("nfs readdirplusrpc bad uio");
#endif
ndp->ni_dvp = vp;
newvp = NULLVP;
/*
* Loop around doing readdir rpc's of size nm_readdirsize
* truncated to a multiple of NFS_DIRFRAGSIZ.
* The stopping criteria is EOF or buffer full.
*/
while (more_dirs && bigenough) {
if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) {
bigenough = 0;
break;
}
nfsstats.rpccnt[NFSPROC_READDIRPLUS]++;
nfsm_reqhead(dnp, NFSPROC_READDIRPLUS,
NFSX_FH(1) + 6 * NFSX_UNSIGNED);
nfsm_fhtom(dnp, 1);
nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) {
txdr_swapcookie3(uiop->uio_offset, tl);
} else {
txdr_cookie3(uiop->uio_offset, tl);
}
tl += 2;
*tl++ = dnp->n_cookieverf.nfsuquad[0];
*tl++ = dnp->n_cookieverf.nfsuquad[1];
*tl++ = txdr_unsigned(nmp->nm_readdirsize);
*tl = txdr_unsigned(nmp->nm_rsize);
nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred);
nfsm_postop_attr(vp, attrflag, 0);
if (error) {
m_freem(mrep);
goto nfsmout;
}
nrpcs++;
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
dnp->n_cookieverf.nfsuquad[0] = *tl++;
dnp->n_cookieverf.nfsuquad[1] = *tl++;
more_dirs = fxdr_unsigned(int, *tl);
/* loop thru the dir entries, doctoring them to 4bsd form */
while (more_dirs && bigenough) {
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
fileno = fxdr_hyper(tl);
len = fxdr_unsigned(int, *(tl + 2));
if (len <= 0 || len > NFS_MAXNAMLEN) {
error = EBADRPC;
m_freem(mrep);
goto nfsmout;
}
/* for cookie stashing */
reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t);
left = NFS_DIRFRAGSIZ - blksiz;
if (reclen > left) {
/*
* DIRFRAGSIZ is aligned, no need to align
* again here.
*/
memset(uiop->uio_iov->iov_base, 0, left);
dp->d_reclen += left;
UIO_ADVANCE(uiop, left);
NFS_STASHCOOKIE(dp, uiop->uio_offset);
blksiz = 0;
}
if (reclen > uiop->uio_resid)
bigenough = 0;
if (bigenough) {
int tlen;
dp = (struct dirent *)uiop->uio_iov->iov_base;
dp->d_fileno = fileno;
dp->d_namlen = len;
dp->d_reclen = reclen;
dp->d_type = DT_UNKNOWN;
blksiz += reclen;
if (blksiz == NFS_DIRFRAGSIZ)
blksiz = 0;
UIO_ADVANCE(uiop, DIRHDSIZ);
nfsm_mtouio(uiop, len);
tlen = reclen - (DIRHDSIZ + len);
(void)memset(uiop->uio_iov->iov_base, 0, tlen);
UIO_ADVANCE(uiop, tlen);
cnp->cn_nameptr = dp->d_name;
cnp->cn_namelen = dp->d_namlen;
} else
nfsm_adv(nfsm_rndup(len));
nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
if (bigenough) {
if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE)
uiop->uio_offset =
fxdr_swapcookie3(tl);
else
uiop->uio_offset =
fxdr_cookie3(tl);
NFS_STASHCOOKIE(dp, uiop->uio_offset);
}
tl += 2;
/*
* Since the attributes are before the file handle
* (sigh), we must skip over the attributes and then
* come back and get them.
*/
attrflag = fxdr_unsigned(int, *tl);
if (attrflag) {
nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR);
memcpy(&fattr, fp, NFSX_V3FATTR);
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
doit = fxdr_unsigned(int, *tl);
if (doit) {
nfsm_getfh(fhp, fhsize, 1);
if (NFS_CMPFH(dnp, fhp, fhsize)) {
vref(vp);
newvp = vp;
np = dnp;
} else {
error = nfs_nget1(vp->v_mount, fhp,
fhsize, &np, LK_NOWAIT);
if (!error)
newvp = NFSTOV(np);
}
if (!error) {
nfs_loadattrcache(&newvp, &fattr, 0, 0);
if (bigenough) {
dp->d_type =
IFTODT(VTTOIF(np->n_vattr->va_type));
if (cnp->cn_namelen <= NCHNAMLEN) {
ndp->ni_vp = newvp;
nfs_cache_enter(ndp->ni_dvp,
ndp->ni_vp, cnp);
}
}
}
error = 0;
}
} else {
/* Just skip over the file handle */
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
nfsm_adv(nfsm_rndup(i));
}
if (newvp != NULLVP) {
if (newvp == vp)
vrele(newvp);
else
vput(newvp);
newvp = NULLVP;
}
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = fxdr_unsigned(int, *tl);
}
/*
* If at end of rpc data, get the eof boolean
*/
if (!more_dirs) {
nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
more_dirs = (fxdr_unsigned(int, *tl) == 0);
/*
* kludge: see a comment in nfs_readdirrpc.
*/
if (uiop->uio_resid >= NFS_DIRBLKSIZ)
more_dirs = 0;
}
m_freem(mrep);
}
/*
* Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ
* by increasing d_reclen for the last record.
*/
if (blksiz > 0) {
left = NFS_DIRFRAGSIZ - blksiz;
memset(uiop->uio_iov->iov_base, 0, left);
dp->d_reclen += left;
NFS_STASHCOOKIE(dp, uiop->uio_offset);
UIO_ADVANCE(uiop, left);
}
/*
* We are now either at the end of the directory or have filled the
* block.
*/
if (bigenough) {
dnp->n_direofoffset = uiop->uio_offset;
dnp->n_flag |= NEOFVALID;
}
nfsmout:
if (newvp != NULLVP) {
if(newvp == vp)
vrele(newvp);
else
vput(newvp);
}
return (error);
}
#endif
/*
* 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...
*/
int
nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, bool dolink)
{
struct sillyrename *sp;
struct nfsnode *np;
int error;
pid_t pid;
cache_purge(dvp);
np = VTONFS(vp);
#ifndef DIAGNOSTIC
if (vp->v_type == VDIR)
panic("nfs: sillyrename dir");
#endif
sp = kmem_alloc(sizeof(*sp), KM_SLEEP);
sp->s_cred = kauth_cred_dup(cnp->cn_cred);
sp->s_dvp = dvp;
vref(dvp);
/* Fudge together a funny name */
pid = curlwp->l_proc->p_pid;
memcpy(sp->s_name, ".nfsAxxxx4.4", 13);
sp->s_namlen = 12;
sp->s_name[8] = hexdigits[pid & 0xf];
sp->s_name[7] = hexdigits[(pid >> 4) & 0xf];
sp->s_name[6] = hexdigits[(pid >> 8) & 0xf];
sp->s_name[5] = hexdigits[(pid >> 12) & 0xf];
/* Try lookitups until we get one that isn't there */
while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
curlwp, (struct nfsnode **)0) == 0) {
sp->s_name[4]++;
if (sp->s_name[4] > 'z') {
error = EINVAL;
goto bad;
}
}
if (dolink) {
error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen,
sp->s_cred, curlwp);
/*
* nfs_request maps NFSERR_NOTSUPP to ENOTSUP.
*/
if (error == ENOTSUP) {
error = nfs_renameit(dvp, cnp, sp);
}
} else {
error = nfs_renameit(dvp, cnp, sp);
}
if (error)
goto bad;
error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
curlwp, &np);
np->n_sillyrename = sp;
return (0);
bad:
vrele(sp->s_dvp);
kauth_cred_free(sp->s_cred);
kmem_free(sp, sizeof(*sp));
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
*/
int
nfs_lookitup(struct vnode *dvp, const char *name, int len, kauth_cred_t cred, struct lwp *l, struct nfsnode **npp)
{
u_int32_t *tl;
char *cp;
int32_t t1, t2;
struct vnode *newvp = (struct vnode *)0;
struct nfsnode *np, *dnp = VTONFS(dvp);
char *bpos, *dpos, *cp2;
int error = 0, fhlen;
#ifndef NFS_V2_ONLY
int attrflag;
#endif
struct mbuf *mreq, *mrep, *md, *mb;
nfsfh_t *nfhp;
const int v3 = NFS_ISV3(dvp);
nfsstats.rpccnt[NFSPROC_LOOKUP]++;
nfsm_reqhead(dnp, NFSPROC_LOOKUP,
NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len));
nfsm_fhtom(dnp, v3);
nfsm_strtom(name, len, NFS_MAXNAMLEN);
nfsm_request(dnp, NFSPROC_LOOKUP, l, cred);
if (npp && !error) {
nfsm_getfh(nfhp, fhlen, v3);
if (*npp) {
np = *npp;
if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) {
kmem_free(np->n_fhp, np->n_fhsize);
np->n_fhp = &np->n_fh;
}
#if NFS_SMALLFH < NFSX_V3FHMAX
else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH)
np->n_fhp = kmem_alloc(fhlen, KM_SLEEP);
#endif
memcpy(np->n_fhp, nfhp, fhlen);
np->n_fhsize = fhlen;
newvp = NFSTOV(np);
} else if (NFS_CMPFH(dnp, nfhp, fhlen)) {
vref(dvp);
newvp = dvp;
np = dnp;
} else {
error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np);
if (error) {
m_freem(mrep);
return (error);
}
newvp = NFSTOV(np);
}
#ifndef NFS_V2_ONLY
if (v3) {
nfsm_postop_attr(newvp, attrflag, 0);
if (!attrflag && *npp == NULL) {
m_freem(mrep);
vput(newvp);
return (ENOENT);
}
} else
#endif
nfsm_loadattr(newvp, (struct vattr *)0, 0);
}
nfsm_reqdone;
if (npp && *npp == NULL) {
if (error) {
if (newvp)
vput(newvp);
} else
*npp = np;
}
return (error);
}
#ifndef NFS_V2_ONLY
/*
* Nfs Version 3 commit rpc
*/
int
nfs_commit(struct vnode *vp, off_t offset, uint32_t cnt, struct lwp *l)
{
char *cp;
u_int32_t *tl;
int32_t t1, t2;
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
char *bpos, *dpos, *cp2;
int error = 0, wccflag = NFSV3_WCCRATTR;
struct mbuf *mreq, *mrep, *md, *mb;
struct nfsnode *np;
KASSERT(NFS_ISV3(vp));
#ifdef NFS_DEBUG_COMMIT
printf("commit %lu - %lu\n", (unsigned long)offset,
(unsigned long)(offset + cnt));
#endif
mutex_enter(&nmp->nm_lock);
if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) {
mutex_exit(&nmp->nm_lock);
return (0);
}
mutex_exit(&nmp->nm_lock);
nfsstats.rpccnt[NFSPROC_COMMIT]++;
np = VTONFS(vp);
nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1));
nfsm_fhtom(np, 1);
nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
txdr_hyper(offset, tl);
tl += 2;
*tl = txdr_unsigned(cnt);
nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred);
nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false);
if (!error) {
nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF);
mutex_enter(&nmp->nm_lock);
if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) ||
memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) {
memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF);
error = NFSERR_STALEWRITEVERF;
nmp->nm_iflag |= NFSMNT_STALEWRITEVERF;
}
mutex_exit(&nmp->nm_lock);
}
nfsm_reqdone;
return (error);
}
#endif
/*
* Kludge City..
* - make nfs_bmap() essentially a no-op that does no translation
* - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc
* (Maybe I could use the process's page mapping, but I was concerned that
* Kernel Write might not be enabled and also figured copyout() would do
* a lot more work than memcpy() and also it currently happens in the
* context of the swapper process (2).
*/
int
nfs_bmap(void *v)
{
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift;
if (ap->a_vpp != NULL)
*ap->a_vpp = vp;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn << bshift;
if (ap->a_runp != NULL)
*ap->a_runp = 1024 * 1024; /* XXX */
return (0);
}
/*
* Strategy routine.
* For async requests when nfsiod(s) are running, queue the request by
* calling nfs_asyncio(), otherwise just all nfs_doio() to do the
* request.
*/
int
nfs_strategy(void *v)
{
struct vop_strategy_args *ap = v;
struct buf *bp = ap->a_bp;
int error = 0;
if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC))
panic("nfs physio/async");
/*
* If the op is asynchronous and an i/o daemon is waiting
* queue the request, wake it up and wait for completion
* otherwise just do it ourselves.
*/
if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp))
error = nfs_doio(bp);
return (error);
}
/*
* fsync vnode op. Just call nfs_flush() with commit == 1.
*/
/* ARGSUSED */
int
nfs_fsync(void *v)
{
struct vop_fsync_args /* {
struct vnodeop_desc *a_desc;
struct vnode * a_vp;
kauth_cred_t a_cred;
int a_flags;
off_t offlo;
off_t offhi;
struct lwp * a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
if (vp->v_type != VREG)
return 0;
return (nfs_flush(vp, ap->a_cred,
(ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1));
}
/*
* Flush all the data associated with a vnode.
*/
int
nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l,
int commit)
{
struct nfsnode *np = VTONFS(vp);
int error;
int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO;
UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist);
mutex_enter(vp->v_interlock);
error = VOP_PUTPAGES(vp, 0, 0, flushflags);
if (np->n_flag & NWRITEERR) {
error = np->n_error;
np->n_flag &= ~NWRITEERR;
}
UVMHIST_LOG(ubchist, "returning %d", error,0,0,0);
return (error);
}
/*
* Return POSIX pathconf information applicable to nfs.
*
* N.B. The NFS V2 protocol doesn't support this RPC.
*/
/* ARGSUSED */
int
nfs_pathconf(void *v)
{
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *ap = v;
struct nfsv3_pathconf *pcp;
struct vnode *vp = ap->a_vp;
struct mbuf *mreq, *mrep, *md, *mb;
int32_t t1, t2;
u_int32_t *tl;
char *bpos, *dpos, *cp, *cp2;
int error = 0, attrflag;
#ifndef NFS_V2_ONLY
struct nfsmount *nmp;
unsigned int l;
u_int64_t maxsize;
#endif
const int v3 = NFS_ISV3(vp);
struct nfsnode *np = VTONFS(vp);
switch (ap->a_name) {
/* Names that can be resolved locally. */
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
break;
case _PC_SYNC_IO:
*ap->a_retval = 1;
break;
/* Names that cannot be resolved locally; do an RPC, if possible. */
case _PC_LINK_MAX:
case _PC_NAME_MAX:
case _PC_CHOWN_RESTRICTED:
case _PC_NO_TRUNC:
if (!v3) {
error = EINVAL;
break;
}
nfsstats.rpccnt[NFSPROC_PATHCONF]++;
nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1));
nfsm_fhtom(np, 1);
nfsm_request(np, NFSPROC_PATHCONF,
curlwp, curlwp->l_cred); /* XXX */
nfsm_postop_attr(vp, attrflag, 0);
if (!error) {
nfsm_dissect(pcp, struct nfsv3_pathconf *,
NFSX_V3PATHCONF);
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval =
fxdr_unsigned(register_t, pcp->pc_linkmax);
break;
case _PC_NAME_MAX:
*ap->a_retval =
fxdr_unsigned(register_t, pcp->pc_namemax);
break;
case _PC_CHOWN_RESTRICTED:
*ap->a_retval =
(pcp->pc_chownrestricted == nfs_true);
break;
case _PC_NO_TRUNC:
*ap->a_retval =
(pcp->pc_notrunc == nfs_true);
break;
}
}
nfsm_reqdone;
break;
case _PC_FILESIZEBITS:
#ifndef NFS_V2_ONLY
if (v3) {
nmp = VFSTONFS(vp->v_mount);
if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
if ((error = nfs_fsinfo(nmp, vp,
curlwp->l_cred, curlwp)) != 0) /* XXX */
break;
for (l = 0, maxsize = nmp->nm_maxfilesize;
(maxsize >> l) > 0; l++)
;
*ap->a_retval = l + 1;
} else
#endif
{
*ap->a_retval = 32; /* NFS V2 limitation */
}
break;
default:
error = EINVAL;
break;
}
return (error);
}
/*
* NFS advisory byte-level locks.
*/
int
nfs_advlock(void *v)
{
struct vop_advlock_args /* {
struct vnode *a_vp;
void *a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap = v;
struct nfsnode *np = VTONFS(ap->a_vp);
return lf_advlock(ap, &np->n_lockf, np->n_size);
}
/*
* Print out the contents of an nfsnode.
*/
int
nfs_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsnode *np = VTONFS(vp);
printf("tag VT_NFS, fileid %lld fsid 0x%llx",
(unsigned long long)np->n_vattr->va_fileid,
(unsigned long long)np->n_vattr->va_fsid);
if (vp->v_type == VFIFO)
VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v);
printf("\n");
return (0);
}
/*
* nfs unlock wrapper.
*/
int
nfs_unlock(void *v)
{
struct vop_unlock_args /* {
struct vnode *a_vp;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
/*
* VOP_UNLOCK can be called by nfs_loadattrcache
* with v_data == 0.
*/
if (VTONFS(vp)) {
nfs_delayedtruncate(vp);
}
return genfs_unlock(v);
}
/*
* nfs special file access vnode op.
* Essentially just get vattr and then imitate iaccess() since the device is
* local to the client.
*/
int
nfsspec_access(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 vattr va;
struct vnode *vp = ap->a_vp;
int error;
error = VOP_GETATTR(vp, &va, ap->a_cred);
if (error)
return (error);
/*
* Disallow write attempts on filesystems mounted read-only;
* unless the file is a socket, fifo, or a block or character
* device resident on the filesystem.
*/
if ((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;
}
}
return kauth_authorize_vnode(ap->a_cred, KAUTH_ACCESS_ACTION(ap->a_mode,
va.va_type, va.va_mode), vp, NULL, genfs_can_access(va.va_type,
va.va_mode, va.va_uid, va.va_gid, ap->a_mode, ap->a_cred));
}
/*
* Read wrapper for special devices.
*/
int
nfsspec_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set access flag.
*/
np->n_flag |= NACC;
getnanotime(&np->n_atim);
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for special devices.
*/
int
nfsspec_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set update flag.
*/
np->n_flag |= NUPD;
getnanotime(&np->n_mtim);
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for special devices.
*
* Update the times on the nfsnode then do device close.
*/
int
nfsspec_close(void *v)
{
struct vop_close_args /* {
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);
struct vattr vattr;
if (np->n_flag & (NACC | NUPD)) {
np->n_flag |= NCHG;
if (vp->v_usecount == 1 &&
(vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
vattr_null(&vattr);
if (np->n_flag & NACC)
vattr.va_atime = np->n_atim;
if (np->n_flag & NUPD)
vattr.va_mtime = np->n_mtim;
(void)VOP_SETATTR(vp, &vattr, ap->a_cred);
}
}
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap));
}
/*
* Read wrapper for fifos.
*/
int
nfsfifo_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set access flag.
*/
np->n_flag |= NACC;
getnanotime(&np->n_atim);
return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for fifos.
*/
int
nfsfifo_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct nfsnode *np = VTONFS(ap->a_vp);
/*
* Set update flag.
*/
np->n_flag |= NUPD;
getnanotime(&np->n_mtim);
return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for fifos.
*
* Update the times on the nfsnode then do fifo close.
*/
int
nfsfifo_close(void *v)
{
struct vop_close_args /* {
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);
struct vattr vattr;
if (np->n_flag & (NACC | NUPD)) {
struct timespec ts;
getnanotime(&ts);
if (np->n_flag & NACC)
np->n_atim = ts;
if (np->n_flag & NUPD)
np->n_mtim = ts;
np->n_flag |= NCHG;
if (vp->v_usecount == 1 &&
(vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
vattr_null(&vattr);
if (np->n_flag & NACC)
vattr.va_atime = np->n_atim;
if (np->n_flag & NUPD)
vattr.va_mtime = np->n_mtim;
(void)VOP_SETATTR(vp, &vattr, ap->a_cred);
}
}
return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap));
}
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