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NetBSD/sys/nfs/nfs_clntsubs.c

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/* $NetBSD: nfs_clntsubs.c,v 1.6 2022/02/28 08:45:36 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_subs.c 8.8 (Berkeley) 5/22/95
*/
/*
* Copyright 2000 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Frank van der Linden for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_clntsubs.c,v 1.6 2022/02/28 08:45:36 hannken Exp $");
#ifdef _KERNEL_OPT
#include "opt_nfs.h"
#endif
/*
* These functions support the macros and help fiddle mbuf chains for
* the nfs op functions. They do things like create the rpc header and
* copy data between mbuf chains and uio lists.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/time.h>
#include <sys/dirent.h>
#include <sys/once.h>
#include <sys/kauth.h>
#include <sys/atomic.h>
#include <uvm/uvm_extern.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfsnode.h>
#include <nfs/nfs.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsmount.h>
#include <nfs/nfsrtt.h>
#include <nfs/nfs_var.h>
#include <miscfs/specfs/specdev.h>
#include <netinet/in.h>
/*
* Attribute cache routines.
* nfs_loadattrcache() - loads or updates the cache contents from attributes
* that are on the mbuf list
* nfs_getattrcache() - returns valid attributes if found in cache, returns
* error otherwise
*/
/*
* Load the attribute cache (that lives in the nfsnode entry) with
* the values on the mbuf list and
* Iff vap not NULL
* copy the attributes to *vaper
*/
int
nfsm_loadattrcache(struct vnode **vpp, struct mbuf **mdp, char **dposp, struct vattr *vaper, int flags)
{
int32_t t1;
char *cp2;
int error = 0;
struct mbuf *md;
int v3 = NFS_ISV3(*vpp);
md = *mdp;
t1 = (mtod(md, char *) + md->m_len) - *dposp;
error = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, &cp2);
if (error)
return (error);
return nfs_loadattrcache(vpp, (struct nfs_fattr *)cp2, vaper, flags);
}
int
nfs_loadattrcache(struct vnode **vpp, struct nfs_fattr *fp, struct vattr *vaper, int flags)
{
struct vnode *vp = *vpp;
struct vattr *vap;
int v3 = NFS_ISV3(vp);
enum vtype vtyp;
u_short vmode;
struct timespec mtime;
struct timespec ctime;
int32_t rdev;
struct nfsnode *np;
extern int (**spec_nfsv2nodeop_p)(void *);
uid_t uid;
gid_t gid;
if (v3) {
vtyp = nfsv3tov_type(fp->fa_type);
vmode = fxdr_unsigned(u_short, fp->fa_mode);
rdev = makedev(fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata1),
fxdr_unsigned(u_int32_t, fp->fa3_rdev.specdata2));
fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
fxdr_nfsv3time(&fp->fa3_ctime, &ctime);
} else {
vtyp = nfsv2tov_type(fp->fa_type);
vmode = fxdr_unsigned(u_short, fp->fa_mode);
if (vtyp == VNON || vtyp == VREG)
vtyp = IFTOVT(vmode);
rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
ctime.tv_sec = fxdr_unsigned(u_int32_t,
fp->fa2_ctime.nfsv2_sec);
ctime.tv_nsec = 0;
/*
* Really ugly NFSv2 kludge.
*/
if (vtyp == VCHR && rdev == 0xffffffff)
vtyp = VFIFO;
}
vmode &= ALLPERMS;
/*
* If v_type == VNON it is a new node, so fill in the v_type,
* n_mtime fields. Check to see if it represents a special
* device, and if so, check for a possible alias. Once the
* correct vnode has been obtained, fill in the rest of the
* information.
*/
np = VTONFS(vp);
if (vp->v_type == VNON) {
vp->v_type = vtyp;
if (vp->v_type == VFIFO) {
extern int (**fifo_nfsv2nodeop_p)(void *);
vp->v_op = fifo_nfsv2nodeop_p;
} else if (vp->v_type == VREG) {
mutex_init(&np->n_commitlock, MUTEX_DEFAULT, IPL_NONE);
} else if (vp->v_type == VCHR || vp->v_type == VBLK) {
vp->v_op = spec_nfsv2nodeop_p;
spec_node_init(vp, (dev_t)rdev);
}
np->n_mtime = mtime;
}
uid = fxdr_unsigned(uid_t, fp->fa_uid);
gid = fxdr_unsigned(gid_t, fp->fa_gid);
vap = np->n_vattr;
/*
* Invalidate access cache if uid, gid, mode or ctime changed.
*/
if (np->n_accstamp != -1 &&
(gid != vap->va_gid || uid != vap->va_uid || vmode != vap->va_mode
|| timespeccmp(&ctime, &vap->va_ctime, !=)))
np->n_accstamp = -1;
vap->va_type = vtyp;
vap->va_mode = vmode;
vap->va_rdev = (dev_t)rdev;
vap->va_mtime = mtime;
vap->va_ctime = ctime;
vap->va_birthtime.tv_sec = VNOVAL;
vap->va_birthtime.tv_nsec = VNOVAL;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0];
switch (vtyp) {
case VDIR:
vap->va_blocksize = NFS_DIRFRAGSIZ;
break;
case VBLK:
vap->va_blocksize = BLKDEV_IOSIZE;
break;
case VCHR:
vap->va_blocksize = MAXBSIZE;
break;
default:
vap->va_blocksize = v3 ? vp->v_mount->mnt_stat.f_iosize :
fxdr_unsigned(int32_t, fp->fa2_blocksize);
break;
}
if (v3) {
vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
vap->va_uid = uid;
vap->va_gid = gid;
vap->va_size = fxdr_hyper(&fp->fa3_size);
vap->va_bytes = fxdr_hyper(&fp->fa3_used);
vap->va_fileid = fxdr_hyper(&fp->fa3_fileid);
fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
vap->va_flags = 0;
vap->va_filerev = 0;
} else {
vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
vap->va_uid = uid;
vap->va_gid = gid;
vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
vap->va_bytes = fxdr_unsigned(int32_t, fp->fa2_blocks)
* NFS_FABLKSIZE;
vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
vap->va_flags = 0;
vap->va_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
vap->va_filerev = 0;
}
if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) {
return EFBIG;
}
if (vap->va_size != np->n_size) {
if ((np->n_flag & NMODIFIED) && vap->va_size < np->n_size) {
vap->va_size = np->n_size;
} else {
np->n_size = vap->va_size;
if (vap->va_type == VREG) {
/*
* we can't free pages if NAC_NOTRUNC because
* the pages can be owned by ourselves.
*/
if (flags & NAC_NOTRUNC) {
np->n_flag |= NTRUNCDELAYED;
} else {
genfs_node_wrlock(vp);
rw_enter(vp->v_uobj.vmobjlock, RW_WRITER);
(void)VOP_PUTPAGES(vp, 0,
0, PGO_SYNCIO | PGO_CLEANIT |
PGO_FREE | PGO_ALLPAGES);
uvm_vnp_setsize(vp, np->n_size);
genfs_node_unlock(vp);
}
}
}
}
np->n_attrstamp = time_second;
if (vaper != NULL) {
memcpy((void *)vaper, (void *)vap, sizeof(*vap));
if (np->n_flag & NCHG) {
if (np->n_flag & NACC)
vaper->va_atime = np->n_atim;
if (np->n_flag & NUPD)
vaper->va_mtime = np->n_mtim;
}
}
return (0);
}
/*
* Check the time stamp
* If the cache is valid, copy contents to *vap and return 0
* otherwise return an error
*/
int
nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
{
struct nfsnode *np = VTONFS(vp);
struct nfsmount *nmp = VFSTONFS(vp->v_mount);
struct vattr *vap;
if (np->n_attrstamp == 0 ||
(time_second - np->n_attrstamp) >= nfs_attrtimeo(nmp, np)) {
nfsstats.attrcache_misses++;
return (ENOENT);
}
nfsstats.attrcache_hits++;
vap = np->n_vattr;
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if ((np->n_flag & NMODIFIED) != 0 &&
vap->va_size < np->n_size) {
vap->va_size = np->n_size;
} else {
np->n_size = vap->va_size;
}
genfs_node_wrlock(vp);
uvm_vnp_setsize(vp, np->n_size);
genfs_node_unlock(vp);
} else
np->n_size = vap->va_size;
}
memcpy((void *)vaper, (void *)vap, sizeof(struct vattr));
if (np->n_flag & NCHG) {
if (np->n_flag & NACC)
vaper->va_atime = np->n_atim;
if (np->n_flag & NUPD)
vaper->va_mtime = np->n_mtim;
}
return (0);
}
void
nfs_delayedtruncate(struct vnode *vp)
{
struct nfsnode *np = VTONFS(vp);
if (np->n_flag & NTRUNCDELAYED) {
np->n_flag &= ~NTRUNCDELAYED;
genfs_node_wrlock(vp);
rw_enter(vp->v_uobj.vmobjlock, RW_WRITER);
(void)VOP_PUTPAGES(vp, 0,
0, PGO_SYNCIO | PGO_CLEANIT | PGO_FREE | PGO_ALLPAGES);
uvm_vnp_setsize(vp, np->n_size);
genfs_node_unlock(vp);
}
}
#define NFS_WCCKLUDGE_TIMEOUT (24 * 60 * 60) /* 1 day */
#define NFS_WCCKLUDGE(nmp, now) \
(((nmp)->nm_iflag & NFSMNT_WCCKLUDGE) && \
((now) - (nmp)->nm_wcckludgetime - NFS_WCCKLUDGE_TIMEOUT) < 0)
/*
* nfs_check_wccdata: check inaccurate wcc_data
*
* => return non-zero if we shouldn't trust the wcc_data.
* => NFS_WCCKLUDGE_TIMEOUT is for the case that the server is "fixed".
*/
int
nfs_check_wccdata(struct nfsnode *np, const struct timespec *ctime,
struct timespec *mtime, bool docheck)
{
int error = 0;
#if !defined(NFS_V2_ONLY)
if (docheck) {
struct vnode *vp = NFSTOV(np);
struct nfsmount *nmp;
long now = time_second;
const struct timespec *omtime = &np->n_vattr->va_mtime;
const struct timespec *octime = &np->n_vattr->va_ctime;
const char *reason = NULL; /* XXX: gcc */
if (timespeccmp(omtime, mtime, <=)) {
reason = "mtime";
error = EINVAL;
}
if (vp->v_type == VDIR && timespeccmp(octime, ctime, <=)) {
reason = "ctime";
error = EINVAL;
}
nmp = VFSTONFS(vp->v_mount);
if (error) {
/*
* despite of the fact that we've updated the file,
* timestamps of the file were not updated as we
* expected.
* it means that the server has incompatible
* semantics of timestamps or (more likely)
* the server time is not precise enough to
* track each modifications.
* in that case, we disable wcc processing.
*
* yes, strictly speaking, we should disable all
* caching. it's a compromise.
*/
mutex_enter(&nmp->nm_lock);
if (!NFS_WCCKLUDGE(nmp, now)) {
printf("%s: inaccurate wcc data (%s) detected,"
" disabling wcc"
" (ctime %u.%09u %u.%09u,"
" mtime %u.%09u %u.%09u)\n",
vp->v_mount->mnt_stat.f_mntfromname,
reason,
(unsigned int)octime->tv_sec,
(unsigned int)octime->tv_nsec,
(unsigned int)ctime->tv_sec,
(unsigned int)ctime->tv_nsec,
(unsigned int)omtime->tv_sec,
(unsigned int)omtime->tv_nsec,
(unsigned int)mtime->tv_sec,
(unsigned int)mtime->tv_nsec);
}
nmp->nm_iflag |= NFSMNT_WCCKLUDGE;
nmp->nm_wcckludgetime = now;
mutex_exit(&nmp->nm_lock);
} else if (NFS_WCCKLUDGE(nmp, now)) {
error = EPERM; /* XXX */
} else if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) {
mutex_enter(&nmp->nm_lock);
if (nmp->nm_iflag & NFSMNT_WCCKLUDGE) {
printf("%s: re-enabling wcc\n",
vp->v_mount->mnt_stat.f_mntfromname);
nmp->nm_iflag &= ~NFSMNT_WCCKLUDGE;
}
mutex_exit(&nmp->nm_lock);
}
}
#endif /* !defined(NFS_V2_ONLY) */
return error;
}
/*
* Heuristic to see if the server XDR encodes directory cookies or not.
* it is not supposed to, but a lot of servers may do this. Also, since
* most/all servers will implement V2 as well, it is expected that they
* may return just 32 bits worth of cookie information, so we need to
* find out in which 32 bits this information is available. We do this
* to avoid trouble with emulated binaries that can't handle 64 bit
* directory offsets.
*/
void
nfs_cookieheuristic(struct vnode *vp, int *flagp, struct lwp *l, kauth_cred_t cred)
{
struct uio auio;
struct iovec aiov;
char *tbuf, *cp;
struct dirent *dp;
off_t *cookies = NULL, *cop;
int error, eof, nc, len;
tbuf = malloc(NFS_DIRFRAGSIZ, M_TEMP, M_WAITOK);
aiov.iov_base = tbuf;
aiov.iov_len = NFS_DIRFRAGSIZ;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_resid = NFS_DIRFRAGSIZ;
auio.uio_offset = 0;
UIO_SETUP_SYSSPACE(&auio);
error = VOP_READDIR(vp, &auio, cred, &eof, &cookies, &nc);
len = NFS_DIRFRAGSIZ - auio.uio_resid;
if (error || len == 0) {
free(tbuf, M_TEMP);
if (cookies)
free(cookies, M_TEMP);
return;
}
/*
* Find the first valid entry and look at its offset cookie.
*/
cp = tbuf;
for (cop = cookies; len > 0; len -= dp->d_reclen) {
dp = (struct dirent *)cp;
if (dp->d_fileno != 0 && len >= dp->d_reclen) {
if ((*cop >> 32) != 0 && (*cop & 0xffffffffLL) == 0) {
*flagp |= NFSMNT_SWAPCOOKIE;
nfs_invaldircache(vp, 0);
nfs_vinvalbuf(vp, 0, cred, l, 1);
}
break;
}
cop++;
cp += dp->d_reclen;
}
free(tbuf, M_TEMP);
free(cookies, M_TEMP);
}
/*
* Set the attribute timeout based on how recently the file has been modified.
*/
time_t
nfs_attrtimeo(struct nfsmount *nmp, struct nfsnode *np)
{
time_t timeo;
if ((nmp->nm_flag & NFSMNT_NOAC) != 0)
return 0;
if (((np)->n_flag & NMODIFIED) != 0)
return NFS_MINATTRTIMO;
timeo = (time_second - np->n_mtime.tv_sec) / 10;
timeo = uimax(timeo, NFS_MINATTRTIMO);
timeo = uimin(timeo, NFS_MAXATTRTIMO);
return timeo;
}
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