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HardenedBSD/sys/fs/nfsclient/nfs_clport.c
Konstantin Belousov 656d2e83d9 nfsclient: eliminate ncl_writebp() 
Use plain bufwrite() instead.  ncl_writebp() evolved to mostly repeat
bufwrite() code with some ommisions, most notably runningbufspace
accounting.

Reviewed by:	imp, markj, rmacklem
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D43249
2024-01-05 06:58:18 +02:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*
*/
#include <sys/cdefs.h>
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/capsicum.h>
/*
* generally, I don't like #includes inside .h files, but it seems to
* be the easiest way to handle the port.
*/
#include <sys/fail.h>
#include <sys/hash.h>
#include <sys/sysctl.h>
#include <fs/nfs/nfsport.h>
#include <netinet/in_fib.h>
#include <netinet/if_ether.h>
#include <netinet6/ip6_var.h>
#include <net/if_types.h>
#include <net/route/nhop.h>
#include <fs/nfsclient/nfs_kdtrace.h>
#ifdef KDTRACE_HOOKS
dtrace_nfsclient_attrcache_flush_probe_func_t
dtrace_nfscl_attrcache_flush_done_probe;
uint32_t nfscl_attrcache_flush_done_id;
dtrace_nfsclient_attrcache_get_hit_probe_func_t
dtrace_nfscl_attrcache_get_hit_probe;
uint32_t nfscl_attrcache_get_hit_id;
dtrace_nfsclient_attrcache_get_miss_probe_func_t
dtrace_nfscl_attrcache_get_miss_probe;
uint32_t nfscl_attrcache_get_miss_id;
dtrace_nfsclient_attrcache_load_probe_func_t
dtrace_nfscl_attrcache_load_done_probe;
uint32_t nfscl_attrcache_load_done_id;
#endif /* !KDTRACE_HOOKS */
extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
extern struct vop_vector newnfs_vnodeops;
extern struct vop_vector newnfs_fifoops;
extern uma_zone_t newnfsnode_zone;
extern uma_zone_t ncl_pbuf_zone;
extern short nfsv4_cbport;
extern int nfscl_enablecallb;
extern int nfs_numnfscbd;
extern int nfscl_inited;
struct mtx ncl_iod_mutex;
NFSDLOCKMUTEX;
extern struct mtx nfsrv_dslock_mtx;
extern void (*ncl_call_invalcaches)(struct vnode *);
SYSCTL_DECL(_vfs_nfs);
static int ncl_fileid_maxwarnings = 10;
SYSCTL_INT(_vfs_nfs, OID_AUTO, fileid_maxwarnings, CTLFLAG_RWTUN,
&ncl_fileid_maxwarnings, 0,
"Limit fileid corruption warnings; 0 is off; -1 is unlimited");
static volatile int ncl_fileid_nwarnings;
static void nfscl_warn_fileid(struct nfsmount *, struct nfsvattr *,
struct nfsvattr *);
/*
* Comparison function for vfs_hash functions.
*/
int
newnfs_vncmpf(struct vnode *vp, void *arg)
{
struct nfsfh *nfhp = (struct nfsfh *)arg;
struct nfsnode *np = VTONFS(vp);
if (np->n_fhp->nfh_len != nfhp->nfh_len ||
NFSBCMP(np->n_fhp->nfh_fh, nfhp->nfh_fh, nfhp->nfh_len))
return (1);
return (0);
}
/*
* Look up a vnode/nfsnode by file handle.
* Callers must check for mount points!!
* In all cases, a pointer to a
* nfsnode structure is returned.
* This variant takes a "struct nfsfh *" as second argument and uses
* that structure up, either by hanging off the nfsnode or FREEing it.
*/
int
nfscl_nget(struct mount *mntp, struct vnode *dvp, struct nfsfh *nfhp,
struct componentname *cnp, struct thread *td, struct nfsnode **npp,
int lkflags)
{
struct nfsnode *np, *dnp;
struct vnode *vp, *nvp;
struct nfsv4node *newd, *oldd;
int error;
u_int hash;
struct nfsmount *nmp;
nmp = VFSTONFS(mntp);
dnp = VTONFS(dvp);
*npp = NULL;
/*
* If this is the mount point fh and NFSMNTP_FAKEROOT is set, replace
* it with the fake fh.
*/
if ((nmp->nm_privflag & NFSMNTP_FAKEROOTFH) != 0 &&
nmp->nm_fhsize > 0 && nmp->nm_fhsize == nfhp->nfh_len &&
!NFSBCMP(nmp->nm_fh, nfhp->nfh_fh, nmp->nm_fhsize)) {
free(nfhp, M_NFSFH);
nfhp = malloc(sizeof(struct nfsfh) + NFSX_FHMAX + 1,
M_NFSFH, M_WAITOK | M_ZERO);
nfhp->nfh_len = NFSX_FHMAX + 1;
}
hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len, FNV1_32_INIT);
error = vfs_hash_get(mntp, hash, lkflags,
td, &nvp, newnfs_vncmpf, nfhp);
if (error == 0 && nvp != NULL) {
/*
* I believe there is a slight chance that vgonel() could
* get called on this vnode between when NFSVOPLOCK() drops
* the VI_LOCK() and vget() acquires it again, so that it
* hasn't yet had v_usecount incremented. If this were to
* happen, the VIRF_DOOMED flag would be set, so check for
* that here. Since we now have the v_usecount incremented,
* we should be ok until we vrele() it, if the VIRF_DOOMED
* flag isn't set now.
*/
VI_LOCK(nvp);
if (VN_IS_DOOMED(nvp)) {
VI_UNLOCK(nvp);
vrele(nvp);
error = ENOENT;
} else {
VI_UNLOCK(nvp);
}
}
if (error) {
free(nfhp, M_NFSFH);
return (error);
}
if (nvp != NULL) {
np = VTONFS(nvp);
/*
* For NFSv4, check to see if it is the same name and
* replace the name, if it is different.
*/
oldd = newd = NULL;
if ((nmp->nm_flag & NFSMNT_NFSV4) && np->n_v4 != NULL &&
nvp->v_type == VREG &&
(np->n_v4->n4_namelen != cnp->cn_namelen ||
NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
cnp->cn_namelen) ||
dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
dnp->n_fhp->nfh_len))) {
newd = malloc(
sizeof (struct nfsv4node) + dnp->n_fhp->nfh_len +
+ cnp->cn_namelen - 1, M_NFSV4NODE, M_WAITOK);
NFSLOCKNODE(np);
if (newd != NULL && np->n_v4 != NULL && nvp->v_type == VREG
&& (np->n_v4->n4_namelen != cnp->cn_namelen ||
NFSBCMP(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
cnp->cn_namelen) ||
dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
dnp->n_fhp->nfh_len))) {
oldd = np->n_v4;
np->n_v4 = newd;
newd = NULL;
np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
np->n_v4->n4_namelen = cnp->cn_namelen;
NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
dnp->n_fhp->nfh_len);
NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
cnp->cn_namelen);
}
NFSUNLOCKNODE(np);
}
if (newd != NULL)
free(newd, M_NFSV4NODE);
if (oldd != NULL)
free(oldd, M_NFSV4NODE);
*npp = np;
free(nfhp, M_NFSFH);
return (0);
}
np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO);
error = getnewvnode(nfs_vnode_tag, mntp, &newnfs_vnodeops, &nvp);
if (error) {
uma_zfree(newnfsnode_zone, np);
free(nfhp, M_NFSFH);
return (error);
}
vp = nvp;
KASSERT(vp->v_bufobj.bo_bsize != 0, ("nfscl_nget: bo_bsize == 0"));
vp->v_data = np;
np->n_vnode = vp;
/*
* Initialize the mutex even if the vnode is going to be a loser.
* This simplifies the logic in reclaim, which can then unconditionally
* destroy the mutex (in the case of the loser, or if hash_insert
* happened to return an error no special casing is needed).
*/
mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK);
lockinit(&np->n_excl, PVFS, "nfsupg", VLKTIMEOUT, LK_NOSHARE |
LK_CANRECURSE);
/*
* Are we getting the root? If so, make sure the vnode flags
* are correct
*/
if (nfhp->nfh_len == NFSX_FHMAX + 1 ||
(nfhp->nfh_len == nmp->nm_fhsize &&
!bcmp(nfhp->nfh_fh, nmp->nm_fh, nfhp->nfh_len))) {
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_vflag |= VV_ROOT;
}
vp->v_vflag |= VV_VMSIZEVNLOCK;
np->n_fhp = nfhp;
/*
* For NFSv4.0, we have to attach the directory file handle and
* file name, so that Open Ops can be done later.
*/
if (NFSHASNFSV4(nmp) && !NFSHASNFSV4N(nmp)) {
np->n_v4 = malloc(sizeof (struct nfsv4node)
+ dnp->n_fhp->nfh_len + cnp->cn_namelen - 1, M_NFSV4NODE,
M_WAITOK);
np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
np->n_v4->n4_namelen = cnp->cn_namelen;
NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
dnp->n_fhp->nfh_len);
NFSBCOPY(cnp->cn_nameptr, NFS4NODENAME(np->n_v4),
cnp->cn_namelen);
} else {
np->n_v4 = NULL;
}
/*
* NFS supports recursive and shared locking.
*/
lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
VN_LOCK_AREC(vp);
VN_LOCK_ASHARE(vp);
error = insmntque(vp, mntp);
if (error != 0) {
*npp = NULL;
mtx_destroy(&np->n_mtx);
lockdestroy(&np->n_excl);
free(nfhp, M_NFSFH);
if (np->n_v4 != NULL)
free(np->n_v4, M_NFSV4NODE);
uma_zfree(newnfsnode_zone, np);
return (error);
}
vn_set_state(vp, VSTATE_CONSTRUCTED);
error = vfs_hash_insert(vp, hash, lkflags,
td, &nvp, newnfs_vncmpf, nfhp);
if (error)
return (error);
if (nvp != NULL) {
*npp = VTONFS(nvp);
/* vfs_hash_insert() vput()'s the losing vnode */
return (0);
}
*npp = np;
return (0);
}
/*
* Another variant of nfs_nget(). This one is only used by reopen. It
* takes almost the same args as nfs_nget(), but only succeeds if an entry
* exists in the cache. (Since files should already be "open" with a
* vnode ref cnt on the node when reopen calls this, it should always
* succeed.)
* Also, don't get a vnode lock, since it may already be locked by some
* other process that is handling it. This is ok, since all other threads
* on the client are blocked by the nfsc_lock being exclusively held by the
* caller of this function.
*/
int
nfscl_ngetreopen(struct mount *mntp, u_int8_t *fhp, int fhsize,
struct thread *td, struct nfsnode **npp)
{
struct vnode *nvp;
u_int hash;
struct nfsfh *nfhp;
int error;
*npp = NULL;
/* For forced dismounts, just return error. */
if (NFSCL_FORCEDISM(mntp))
return (EINTR);
nfhp = malloc(sizeof (struct nfsfh) + fhsize,
M_NFSFH, M_WAITOK);
bcopy(fhp, &nfhp->nfh_fh[0], fhsize);
nfhp->nfh_len = fhsize;
hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT);
/*
* First, try to get the vnode locked, but don't block for the lock.
*/
error = vfs_hash_get(mntp, hash, (LK_EXCLUSIVE | LK_NOWAIT), td, &nvp,
newnfs_vncmpf, nfhp);
if (error == 0 && nvp != NULL) {
NFSVOPUNLOCK(nvp);
} else if (error == EBUSY) {
/*
* It is safe so long as a vflush() with
* FORCECLOSE has not been done. Since the Renew thread is
* stopped and the MNTK_UNMOUNTF flag is set before doing
* a vflush() with FORCECLOSE, we should be ok here.
*/
if (NFSCL_FORCEDISM(mntp))
error = EINTR;
else {
vfs_hash_ref(mntp, hash, td, &nvp, newnfs_vncmpf, nfhp);
if (nvp == NULL) {
error = ENOENT;
} else if (VN_IS_DOOMED(nvp)) {
error = ENOENT;
vrele(nvp);
} else {
error = 0;
}
}
}
free(nfhp, M_NFSFH);
if (error)
return (error);
if (nvp != NULL) {
*npp = VTONFS(nvp);
return (0);
}
return (EINVAL);
}
static void
nfscl_warn_fileid(struct nfsmount *nmp, struct nfsvattr *oldnap,
struct nfsvattr *newnap)
{
int off;
if (ncl_fileid_maxwarnings >= 0 &&
ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
return;
off = 0;
if (ncl_fileid_maxwarnings >= 0) {
if (++ncl_fileid_nwarnings >= ncl_fileid_maxwarnings)
off = 1;
}
printf("newnfs: server '%s' error: fileid changed. "
"fsid %jx:%jx: expected fileid %#jx, got %#jx. "
"(BROKEN NFS SERVER OR MIDDLEWARE)\n",
nmp->nm_com.nmcom_hostname,
(uintmax_t)nmp->nm_fsid[0],
(uintmax_t)nmp->nm_fsid[1],
(uintmax_t)oldnap->na_fileid,
(uintmax_t)newnap->na_fileid);
if (off)
printf("newnfs: Logged %d times about fileid corruption; "
"going quiet to avoid spamming logs excessively. (Limit "
"is: %d).\n", ncl_fileid_nwarnings,
ncl_fileid_maxwarnings);
}
void
ncl_copy_vattr(struct vattr *dst, struct vattr *src)
{
dst->va_type = src->va_type;
dst->va_mode = src->va_mode;
dst->va_nlink = src->va_nlink;
dst->va_uid = src->va_uid;
dst->va_gid = src->va_gid;
dst->va_fsid = src->va_fsid;
dst->va_fileid = src->va_fileid;
dst->va_size = src->va_size;
dst->va_blocksize = src->va_blocksize;
dst->va_atime = src->va_atime;
dst->va_mtime = src->va_mtime;
dst->va_ctime = src->va_ctime;
dst->va_birthtime = src->va_birthtime;
dst->va_gen = src->va_gen;
dst->va_flags = src->va_flags;
dst->va_rdev = src->va_rdev;
dst->va_bytes = src->va_bytes;
dst->va_filerev = src->va_filerev;
}
/*
* Load the attribute cache (that lives in the nfsnode entry) with
* the attributes of the second argument and
* Iff vaper not NULL
* copy the attributes to *vaper
* Similar to nfs_loadattrcache(), except the attributes are passed in
* instead of being parsed out of the mbuf list.
*/
int
nfscl_loadattrcache(struct vnode **vpp, struct nfsvattr *nap, void *nvaper,
int writeattr, int dontshrink)
{
struct vnode *vp = *vpp;
struct vattr *vap, *nvap = &nap->na_vattr, *vaper = nvaper;
struct nfsnode *np;
struct nfsmount *nmp;
struct timespec mtime_save;
int error, force_fid_err;
dev_t topfsid;
error = 0;
/*
* 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);
NFSLOCKNODE(np);
if (vp->v_type != nvap->va_type) {
vp->v_type = nvap->va_type;
if (vp->v_type == VFIFO)
vp->v_op = &newnfs_fifoops;
np->n_mtime = nvap->va_mtime;
}
nmp = VFSTONFS(vp->v_mount);
vap = &np->n_vattr.na_vattr;
mtime_save = vap->va_mtime;
if (writeattr) {
np->n_vattr.na_filerev = nap->na_filerev;
np->n_vattr.na_size = nap->na_size;
np->n_vattr.na_mtime = nap->na_mtime;
np->n_vattr.na_ctime = nap->na_ctime;
np->n_vattr.na_btime = nap->na_btime;
np->n_vattr.na_fsid = nap->na_fsid;
np->n_vattr.na_mode = nap->na_mode;
} else {
force_fid_err = 0;
KFAIL_POINT_ERROR(DEBUG_FP, nfscl_force_fileid_warning,
force_fid_err);
/*
* BROKEN NFS SERVER OR MIDDLEWARE
*
* Certain NFS servers (certain old proprietary filers ca.
* 2006) or broken middleboxes (e.g. WAN accelerator products)
* will respond to GETATTR requests with results for a
* different fileid.
*
* The WAN accelerator we've observed not only serves stale
* cache results for a given file, it also occasionally serves
* results for wholly different files. This causes surprising
* problems; for example the cached size attribute of a file
* may truncate down and then back up, resulting in zero
* regions in file contents read by applications. We observed
* this reliably with Clang and .c files during parallel build.
* A pcap revealed packet fragmentation and GETATTR RPC
* responses with wholly wrong fileids.
* For the case where the file handle is a fake one
* generated via the "syskrb5" mount option and
* the old fileid is 2, ignore the test, since this might
* be replacing the fake attributes with correct ones.
*/
if ((np->n_vattr.na_fileid != 0 &&
np->n_vattr.na_fileid != nap->na_fileid &&
(np->n_vattr.na_fileid != 2 || !NFSHASSYSKRB5(nmp) ||
np->n_fhp->nfh_len != NFSX_FHMAX + 1)) ||
force_fid_err) {
nfscl_warn_fileid(nmp, &np->n_vattr, nap);
error = EIDRM;
goto out;
}
NFSBCOPY((caddr_t)nap, (caddr_t)&np->n_vattr,
sizeof (struct nfsvattr));
}
/*
* For NFSv4, the server's export may be a tree of file systems
* where a fileno is a unique value within each file system.
* na_filesid[0,1] uniquely identify the server file system
* and nm_fsid[0,1] is the value for the root file system mounted.
* As such, the value of va_fsid generated by vn_fsid() represents
* the root file system on the server and a different value for
* va_fsid is needed for the other server file systems. This
* va_fsid is ideally unique for all of the server file systems,
* so a 64bit hash on na_filesid[0,1] is calculated.
* Although highly unlikely that the fnv_64_hash() will be
* the same as the root, test for this case and recalculate the hash.
*/
vn_fsid(vp, vap);
if (NFSHASNFSV4(nmp) && NFSHASHASSETFSID(nmp) &&
(nmp->nm_fsid[0] != np->n_vattr.na_filesid[0] ||
nmp->nm_fsid[1] != np->n_vattr.na_filesid[1])) {
topfsid = vap->va_fsid;
vap->va_fsid = FNV1_64_INIT;
do {
vap->va_fsid = fnv_64_buf(np->n_vattr.na_filesid,
sizeof(np->n_vattr.na_filesid), vap->va_fsid);
} while (vap->va_fsid == topfsid);
}
np->n_attrstamp = time_second;
if (vap->va_size != np->n_size) {
if (vap->va_type == VREG) {
if (dontshrink && vap->va_size < np->n_size) {
/*
* We've been told not to shrink the file;
* zero np->n_attrstamp to indicate that
* the attributes are stale.
*/
vap->va_size = np->n_size;
np->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
} else if (np->n_flag & NMODIFIED) {
/*
* We've modified the file: Use the larger
* of our size, and the server's size.
*/
if (vap->va_size < np->n_size) {
vap->va_size = np->n_size;
} else {
np->n_size = vap->va_size;
np->n_flag |= NSIZECHANGED;
}
} else {
np->n_size = vap->va_size;
np->n_flag |= NSIZECHANGED;
}
} else {
np->n_size = vap->va_size;
}
}
/*
* The following checks are added to prevent a race between (say)
* a READDIR+ and a WRITE.
* READDIR+, WRITE requests sent out.
* READDIR+ resp, WRITE resp received on client.
* However, the WRITE resp was handled before the READDIR+ resp
* causing the post op attrs from the write to be loaded first
* and the attrs from the READDIR+ to be loaded later. If this
* happens, we have stale attrs loaded into the attrcache.
* We detect this by for the mtime moving back. We invalidate the
* attrcache when this happens.
*/
if (timespeccmp(&mtime_save, &vap->va_mtime, >)) {
/* Size changed or mtime went backwards */
np->n_attrstamp = 0;
KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
}
if (vaper != NULL) {
ncl_copy_vattr(vaper, 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;
}
}
out:
#ifdef KDTRACE_HOOKS
if (np->n_attrstamp != 0)
KDTRACE_NFS_ATTRCACHE_LOAD_DONE(vp, vap, error);
#endif
(void)ncl_pager_setsize(vp, NULL);
return (error);
}
/*
* Call vnode_pager_setsize() if the size of the node changed, as
* recorded in nfsnode vs. v_object, or delay the call if notifying
* the pager is not possible at the moment.
*
* If nsizep is non-NULL, the call is delayed and the new node size is
* provided. Caller should itself call vnode_pager_setsize() if
* function returned true. If nsizep is NULL, function tries to call
* vnode_pager_setsize() itself if needed and possible, and the nfs
* node is unlocked unconditionally, the return value is not useful.
*/
bool
ncl_pager_setsize(struct vnode *vp, u_quad_t *nsizep)
{
struct nfsnode *np;
vm_object_t object;
struct vattr *vap;
u_quad_t nsize;
bool setnsize;
np = VTONFS(vp);
NFSASSERTNODE(np);
vap = &np->n_vattr.na_vattr;
nsize = vap->va_size;
object = vp->v_object;
setnsize = false;
if (object != NULL && nsize != object->un_pager.vnp.vnp_size) {
if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE &&
(curthread->td_pflags2 & TDP2_SBPAGES) == 0)
setnsize = true;
else
np->n_flag |= NVNSETSZSKIP;
}
if (nsizep == NULL) {
NFSUNLOCKNODE(np);
if (setnsize)
vnode_pager_setsize(vp, nsize);
setnsize = false;
} else {
*nsizep = nsize;
}
return (setnsize);
}
/*
* Fill in the client id name. For these bytes:
* 1 - they must be unique
* 2 - they should be persistent across client reboots
* 1 is more critical than 2
* Use the mount point's unique id plus either the uuid or, if that
* isn't set, random junk.
*/
void
nfscl_fillclid(u_int64_t clval, char *uuid, u_int8_t *cp, u_int16_t idlen)
{
int uuidlen;
/*
* First, put in the 64bit mount point identifier.
*/
if (idlen >= sizeof (u_int64_t)) {
NFSBCOPY((caddr_t)&clval, cp, sizeof (u_int64_t));
cp += sizeof (u_int64_t);
idlen -= sizeof (u_int64_t);
}
/*
* If uuid is non-zero length, use it.
*/
uuidlen = strlen(uuid);
if (uuidlen > 0 && idlen >= uuidlen) {
NFSBCOPY(uuid, cp, uuidlen);
cp += uuidlen;
idlen -= uuidlen;
}
/*
* This only normally happens if the uuid isn't set.
*/
while (idlen > 0) {
*cp++ = (u_int8_t)(arc4random() % 256);
idlen--;
}
}
/*
* Fill in a lock owner name. For now, pid + the process's creation time.
*/
void
nfscl_filllockowner(void *id, u_int8_t *cp, int flags)
{
union {
u_int32_t lval;
u_int8_t cval[4];
} tl;
struct proc *p;
if (id == NULL) {
/* Return the single open_owner of all 0 bytes. */
bzero(cp, NFSV4CL_LOCKNAMELEN);
return;
}
if ((flags & F_POSIX) != 0) {
p = (struct proc *)id;
tl.lval = p->p_pid;
*cp++ = tl.cval[0];
*cp++ = tl.cval[1];
*cp++ = tl.cval[2];
*cp++ = tl.cval[3];
tl.lval = p->p_stats->p_start.tv_sec;
*cp++ = tl.cval[0];
*cp++ = tl.cval[1];
*cp++ = tl.cval[2];
*cp++ = tl.cval[3];
tl.lval = p->p_stats->p_start.tv_usec;
*cp++ = tl.cval[0];
*cp++ = tl.cval[1];
*cp++ = tl.cval[2];
*cp = tl.cval[3];
} else if ((flags & F_FLOCK) != 0) {
bcopy(&id, cp, sizeof(id));
bzero(&cp[sizeof(id)], NFSV4CL_LOCKNAMELEN - sizeof(id));
} else {
printf("nfscl_filllockowner: not F_POSIX or F_FLOCK\n");
bzero(cp, NFSV4CL_LOCKNAMELEN);
}
}
/*
* Find the parent process for the thread passed in as an argument.
* If none exists, return NULL, otherwise return a thread for the parent.
* (Can be any of the threads, since it is only used for td->td_proc.)
*/
NFSPROC_T *
nfscl_getparent(struct thread *td)
{
struct proc *p;
struct thread *ptd;
if (td == NULL)
return (NULL);
p = td->td_proc;
if (p->p_pid == 0)
return (NULL);
p = p->p_pptr;
if (p == NULL)
return (NULL);
ptd = TAILQ_FIRST(&p->p_threads);
return (ptd);
}
/*
* Start up the renew kernel thread.
*/
static void
start_nfscl(void *arg)
{
struct nfsclclient *clp;
struct thread *td;
clp = (struct nfsclclient *)arg;
td = TAILQ_FIRST(&clp->nfsc_renewthread->p_threads);
nfscl_renewthread(clp, td);
kproc_exit(0);
}
void
nfscl_start_renewthread(struct nfsclclient *clp)
{
kproc_create(start_nfscl, (void *)clp, &clp->nfsc_renewthread, 0, 0,
"nfscl");
}
/*
* Handle wcc_data.
* For NFSv4, it assumes that nfsv4_wccattr() was used to set up the getattr
* as the first Op after PutFH.
* (For NFSv4, the postop attributes are after the Op, so they can't be
* parsed here. A separate call to nfscl_postop_attr() is required.)
*/
int
nfscl_wcc_data(struct nfsrv_descript *nd, struct vnode *vp,
struct nfsvattr *nap, int *flagp, int *wccflagp, uint64_t *repsizep)
{
u_int32_t *tl;
struct nfsnode *np = VTONFS(vp);
struct nfsvattr nfsva;
int error = 0;
if (wccflagp != NULL)
*wccflagp = 0;
if (nd->nd_flag & ND_NFSV3) {
*flagp = 0;
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
if (*tl == newnfs_true) {
NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
if (wccflagp != NULL) {
NFSLOCKNODE(np);
*wccflagp = (np->n_mtime.tv_sec ==
fxdr_unsigned(u_int32_t, *(tl + 2)) &&
np->n_mtime.tv_nsec ==
fxdr_unsigned(u_int32_t, *(tl + 3)));
NFSUNLOCKNODE(np);
}
}
error = nfscl_postop_attr(nd, nap, flagp);
if (wccflagp != NULL && *flagp == 0)
*wccflagp = 0;
} else if ((nd->nd_flag & (ND_NOMOREDATA | ND_NFSV4 | ND_V4WCCATTR))
== (ND_NFSV4 | ND_V4WCCATTR)) {
error = nfsv4_loadattr(nd, NULL, &nfsva, NULL,
NULL, 0, NULL, NULL, NULL, NULL, NULL, 0,
NULL, NULL, NULL, NULL, NULL);
if (error)
return (error);
/*
* Get rid of Op# and status for next op.
*/
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
if (*++tl)
nd->nd_flag |= ND_NOMOREDATA;
if (repsizep != NULL)
*repsizep = nfsva.na_size;
if (wccflagp != NULL &&
nfsva.na_vattr.va_mtime.tv_sec != 0) {
NFSLOCKNODE(np);
*wccflagp = (np->n_mtime.tv_sec ==
nfsva.na_vattr.va_mtime.tv_sec &&
np->n_mtime.tv_nsec ==
nfsva.na_vattr.va_mtime.tv_sec);
NFSUNLOCKNODE(np);
}
}
nfsmout:
return (error);
}
/*
* Get postop attributes.
*/
int
nfscl_postop_attr(struct nfsrv_descript *nd, struct nfsvattr *nap, int *retp)
{
u_int32_t *tl;
int error = 0;
*retp = 0;
if (nd->nd_flag & ND_NOMOREDATA)
return (error);
if (nd->nd_flag & ND_NFSV3) {
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
*retp = fxdr_unsigned(int, *tl);
} else if (nd->nd_flag & ND_NFSV4) {
/*
* For NFSv4, the postop attr are at the end, so no point
* in looking if nd_repstat != 0.
*/
if (!nd->nd_repstat) {
NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
if (*(tl + 1))
/* should never happen since nd_repstat != 0 */
nd->nd_flag |= ND_NOMOREDATA;
else
*retp = 1;
}
} else if (!nd->nd_repstat) {
/* For NFSv2, the attributes are here iff nd_repstat == 0 */
*retp = 1;
}
if (*retp) {
error = nfsm_loadattr(nd, nap);
if (error)
*retp = 0;
}
nfsmout:
return (error);
}
/*
* nfscl_request() - mostly a wrapper for newnfs_request().
*/
int
nfscl_request(struct nfsrv_descript *nd, struct vnode *vp, NFSPROC_T *p,
struct ucred *cred)
{
int ret, vers;
struct nfsmount *nmp;
nmp = VFSTONFS(vp->v_mount);
if (nd->nd_flag & ND_NFSV4)
vers = NFS_VER4;
else if (nd->nd_flag & ND_NFSV3)
vers = NFS_VER3;
else
vers = NFS_VER2;
ret = newnfs_request(nd, nmp, NULL, &nmp->nm_sockreq, vp, p, cred,
NFS_PROG, vers, NULL, 1, NULL, NULL);
return (ret);
}
/*
* fill in this bsden's variant of statfs using nfsstatfs.
*/
void
nfscl_loadsbinfo(struct nfsmount *nmp, struct nfsstatfs *sfp, void *statfs)
{
struct statfs *sbp = (struct statfs *)statfs;
if (nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_NFSV4)) {
sbp->f_bsize = NFS_FABLKSIZE;
sbp->f_blocks = sfp->sf_tbytes / NFS_FABLKSIZE;
sbp->f_bfree = sfp->sf_fbytes / NFS_FABLKSIZE;
/*
* Although sf_abytes is uint64_t and f_bavail is int64_t,
* the value after dividing by NFS_FABLKSIZE is small
* enough that it will fit in 63bits, so it is ok to
* assign it to f_bavail without fear that it will become
* negative.
*/
sbp->f_bavail = sfp->sf_abytes / NFS_FABLKSIZE;
sbp->f_files = sfp->sf_tfiles;
/* Since f_ffree is int64_t, clip it to 63bits. */
if (sfp->sf_ffiles > INT64_MAX)
sbp->f_ffree = INT64_MAX;
else
sbp->f_ffree = sfp->sf_ffiles;
} else if ((nmp->nm_flag & NFSMNT_NFSV4) == 0) {
/*
* The type casts to (int32_t) ensure that this code is
* compatible with the old NFS client, in that it will
* propagate bit31 to the high order bits. This may or may
* not be correct for NFSv2, but since it is a legacy
* environment, I'd rather retain backwards compatibility.
*/
sbp->f_bsize = (int32_t)sfp->sf_bsize;
sbp->f_blocks = (int32_t)sfp->sf_blocks;
sbp->f_bfree = (int32_t)sfp->sf_bfree;
sbp->f_bavail = (int32_t)sfp->sf_bavail;
sbp->f_files = 0;
sbp->f_ffree = 0;
}
}
/*
* Use the fsinfo stuff to update the mount point.
*/
void
nfscl_loadfsinfo(struct nfsmount *nmp, struct nfsfsinfo *fsp)
{
if ((nmp->nm_wsize == 0 || fsp->fs_wtpref < nmp->nm_wsize) &&
fsp->fs_wtpref >= NFS_FABLKSIZE)
nmp->nm_wsize = (fsp->fs_wtpref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
if (fsp->fs_wtmax < nmp->nm_wsize && fsp->fs_wtmax > 0) {
nmp->nm_wsize = fsp->fs_wtmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = fsp->fs_wtmax;
}
if (nmp->nm_wsize < NFS_FABLKSIZE)
nmp->nm_wsize = NFS_FABLKSIZE;
if ((nmp->nm_rsize == 0 || fsp->fs_rtpref < nmp->nm_rsize) &&
fsp->fs_rtpref >= NFS_FABLKSIZE)
nmp->nm_rsize = (fsp->fs_rtpref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
if (fsp->fs_rtmax < nmp->nm_rsize && fsp->fs_rtmax > 0) {
nmp->nm_rsize = fsp->fs_rtmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = fsp->fs_rtmax;
}
if (nmp->nm_rsize < NFS_FABLKSIZE)
nmp->nm_rsize = NFS_FABLKSIZE;
if ((nmp->nm_readdirsize == 0 || fsp->fs_dtpref < nmp->nm_readdirsize)
&& fsp->fs_dtpref >= NFS_DIRBLKSIZ)
nmp->nm_readdirsize = (fsp->fs_dtpref + NFS_DIRBLKSIZ - 1) &
~(NFS_DIRBLKSIZ - 1);
if (fsp->fs_rtmax < nmp->nm_readdirsize && fsp->fs_rtmax > 0) {
nmp->nm_readdirsize = fsp->fs_rtmax & ~(NFS_DIRBLKSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = fsp->fs_rtmax;
}
if (nmp->nm_readdirsize < NFS_DIRBLKSIZ)
nmp->nm_readdirsize = NFS_DIRBLKSIZ;
if (fsp->fs_maxfilesize > 0 &&
fsp->fs_maxfilesize < nmp->nm_maxfilesize)
nmp->nm_maxfilesize = fsp->fs_maxfilesize;
nmp->nm_mountp->mnt_stat.f_iosize = newnfs_iosize(nmp);
nmp->nm_state |= NFSSTA_GOTFSINFO;
}
/*
* Lookups source address which should be used to communicate with
* @nmp and stores it inside @pdst.
*
* Returns 0 on success.
*/
u_int8_t *
nfscl_getmyip(struct nfsmount *nmp, struct in6_addr *paddr, int *isinet6p)
{
#if defined(INET6) || defined(INET)
int fibnum;
fibnum = curthread->td_proc->p_fibnum;
#endif
#ifdef INET
if (nmp->nm_nam->sa_family == AF_INET) {
struct epoch_tracker et;
struct nhop_object *nh;
struct sockaddr_in *sin;
struct in_addr addr = {};
sin = (struct sockaddr_in *)nmp->nm_nam;
NET_EPOCH_ENTER(et);
CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
nh = fib4_lookup(fibnum, sin->sin_addr, 0, NHR_NONE, 0);
if (nh != NULL) {
addr = IA_SIN(ifatoia(nh->nh_ifa))->sin_addr;
if (IN_LOOPBACK(ntohl(addr.s_addr))) {
/* Ignore loopback addresses */
nh = NULL;
}
}
CURVNET_RESTORE();
NET_EPOCH_EXIT(et);
if (nh == NULL)
return (NULL);
*isinet6p = 0;
*((struct in_addr *)paddr) = addr;
return (u_int8_t *)paddr;
}
#endif
#ifdef INET6
if (nmp->nm_nam->sa_family == AF_INET6) {
struct epoch_tracker et;
struct sockaddr_in6 *sin6;
int error;
sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
NET_EPOCH_ENTER(et);
CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
error = in6_selectsrc_addr(fibnum, &sin6->sin6_addr,
sin6->sin6_scope_id, NULL, paddr, NULL);
CURVNET_RESTORE();
NET_EPOCH_EXIT(et);
if (error != 0)
return (NULL);
if (IN6_IS_ADDR_LOOPBACK(paddr))
return (NULL);
/* Scope is embedded in */
*isinet6p = 1;
return (u_int8_t *)paddr;
}
#endif
return (NULL);
}
/*
* Copy NFS uid, gids from the cred structure.
*/
void
newnfs_copyincred(struct ucred *cr, struct nfscred *nfscr)
{
int i;
KASSERT(cr->cr_ngroups >= 0,
("newnfs_copyincred: negative cr_ngroups"));
nfscr->nfsc_uid = cr->cr_uid;
nfscr->nfsc_ngroups = MIN(cr->cr_ngroups, NFS_MAXGRPS + 1);
for (i = 0; i < nfscr->nfsc_ngroups; i++)
nfscr->nfsc_groups[i] = cr->cr_groups[i];
}
/*
* Do any client specific initialization.
*/
void
nfscl_init(void)
{
static int inited = 0;
if (inited)
return;
inited = 1;
nfscl_inited = 1;
ncl_pbuf_zone = pbuf_zsecond_create("nfspbuf", nswbuf / 2);
}
/*
* Check each of the attributes to be set, to ensure they aren't already
* the correct value. Disable setting ones already correct.
*/
int
nfscl_checksattr(struct vattr *vap, struct nfsvattr *nvap)
{
if (vap->va_mode != (mode_t)VNOVAL) {
if (vap->va_mode == nvap->na_mode)
vap->va_mode = (mode_t)VNOVAL;
}
if (vap->va_uid != (uid_t)VNOVAL) {
if (vap->va_uid == nvap->na_uid)
vap->va_uid = (uid_t)VNOVAL;
}
if (vap->va_gid != (gid_t)VNOVAL) {
if (vap->va_gid == nvap->na_gid)
vap->va_gid = (gid_t)VNOVAL;
}
if (vap->va_size != VNOVAL) {
if (vap->va_size == nvap->na_size)
vap->va_size = VNOVAL;
}
/*
* We are normally called with only a partially initialized
* VAP. Since the NFSv3 spec says that server may use the
* file attributes to store the verifier, the spec requires
* us to do a SETATTR RPC. FreeBSD servers store the verifier
* in atime, but we can't really assume that all servers will
* so we ensure that our SETATTR sets both atime and mtime.
* Set the VA_UTIMES_NULL flag for this case, so that
* the server's time will be used. This is needed to
* work around a bug in some Solaris servers, where
* setting the time TOCLIENT causes the Setattr RPC
* to return NFS_OK, but not set va_mode.
*/
if (vap->va_mtime.tv_sec == VNOVAL) {
vfs_timestamp(&vap->va_mtime);
vap->va_vaflags |= VA_UTIMES_NULL;
}
if (vap->va_atime.tv_sec == VNOVAL)
vap->va_atime = vap->va_mtime;
return (1);
}
/*
* Map nfsv4 errors to errno.h errors.
* The uid and gid arguments are only used for NFSERR_BADOWNER and that
* error should only be returned for the Open, Create and Setattr Ops.
* As such, most calls can just pass in 0 for those arguments.
*/
int
nfscl_maperr(struct thread *td, int error, uid_t uid, gid_t gid)
{
struct proc *p;
if (error < 10000 || error >= NFSERR_STALEWRITEVERF)
return (error);
if (td != NULL)
p = td->td_proc;
else
p = NULL;
switch (error) {
case NFSERR_BADOWNER:
tprintf(p, LOG_INFO,
"No name and/or group mapping for uid,gid:(%d,%d)\n",
uid, gid);
return (EPERM);
case NFSERR_BADNAME:
case NFSERR_BADCHAR:
printf("nfsv4 char/name not handled by server\n");
return (ENOENT);
case NFSERR_STALECLIENTID:
case NFSERR_STALESTATEID:
case NFSERR_EXPIRED:
case NFSERR_BADSTATEID:
case NFSERR_BADSESSION:
printf("nfsv4 recover err returned %d\n", error);
return (EIO);
case NFSERR_BADHANDLE:
case NFSERR_SERVERFAULT:
case NFSERR_BADTYPE:
case NFSERR_FHEXPIRED:
case NFSERR_RESOURCE:
case NFSERR_MOVED:
case NFSERR_MINORVERMISMATCH:
case NFSERR_OLDSTATEID:
case NFSERR_BADSEQID:
case NFSERR_LEASEMOVED:
case NFSERR_RECLAIMBAD:
case NFSERR_BADXDR:
case NFSERR_OPILLEGAL:
printf("nfsv4 client/server protocol prob err=%d\n",
error);
return (EIO);
case NFSERR_NOFILEHANDLE:
printf("nfsv4 no file handle: usually means the file "
"system is not exported on the NFSv4 server\n");
return (EIO);
case NFSERR_WRONGSEC:
tprintf(p, LOG_INFO, "NFSv4 error WrongSec: You probably need a"
" Kerberos TGT\n");
return (EIO);
default:
tprintf(p, LOG_INFO, "nfsv4 err=%d\n", error);
return (EIO);
};
}
/*
* Check to see if the process for this owner exists. Return 1 if it doesn't
* and 0 otherwise.
*/
int
nfscl_procdoesntexist(u_int8_t *own)
{
union {
u_int32_t lval;
u_int8_t cval[4];
} tl;
struct proc *p;
pid_t pid;
int i, ret = 0;
/* For the single open_owner of all 0 bytes, just return 0. */
for (i = 0; i < NFSV4CL_LOCKNAMELEN; i++)
if (own[i] != 0)
break;
if (i == NFSV4CL_LOCKNAMELEN)
return (0);
tl.cval[0] = *own++;
tl.cval[1] = *own++;
tl.cval[2] = *own++;
tl.cval[3] = *own++;
pid = tl.lval;
p = pfind_any_locked(pid);
if (p == NULL)
return (1);
if (p->p_stats == NULL) {
PROC_UNLOCK(p);
return (0);
}
tl.cval[0] = *own++;
tl.cval[1] = *own++;
tl.cval[2] = *own++;
tl.cval[3] = *own++;
if (tl.lval != p->p_stats->p_start.tv_sec) {
ret = 1;
} else {
tl.cval[0] = *own++;
tl.cval[1] = *own++;
tl.cval[2] = *own++;
tl.cval[3] = *own;
if (tl.lval != p->p_stats->p_start.tv_usec)
ret = 1;
}
PROC_UNLOCK(p);
return (ret);
}
/*
* - nfs pseudo system call for the client
*/
/*
* MPSAFE
*/
static int
nfssvc_nfscl(struct thread *td, struct nfssvc_args *uap)
{
struct file *fp;
struct nfscbd_args nfscbdarg;
struct nfsd_nfscbd_args nfscbdarg2;
struct nameidata nd;
struct nfscl_dumpmntopts dumpmntopts;
cap_rights_t rights;
char *buf;
int error;
struct mount *mp;
struct nfsmount *nmp;
NFSD_CURVNET_SET(NFSD_TD_TO_VNET(td));
if (uap->flag & NFSSVC_CBADDSOCK) {
error = copyin(uap->argp, (caddr_t)&nfscbdarg, sizeof(nfscbdarg));
if (error)
goto out;
/*
* Since we don't know what rights might be required,
* pretend that we need them all. It is better to be too
* careful than too reckless.
*/
error = fget(td, nfscbdarg.sock,
cap_rights_init_one(&rights, CAP_SOCK_CLIENT), &fp);
if (error)
goto out;
if (fp->f_type != DTYPE_SOCKET) {
fdrop(fp, td);
error = EPERM;
goto out;
}
error = nfscbd_addsock(fp);
fdrop(fp, td);
if (!error && nfscl_enablecallb == 0) {
nfsv4_cbport = nfscbdarg.port;
nfscl_enablecallb = 1;
}
} else if (uap->flag & NFSSVC_NFSCBD) {
if (uap->argp == NULL) {
error = EINVAL;
goto out;
}
error = copyin(uap->argp, (caddr_t)&nfscbdarg2,
sizeof(nfscbdarg2));
if (error)
goto out;
error = nfscbd_nfsd(td, &nfscbdarg2);
} else if (uap->flag & NFSSVC_DUMPMNTOPTS) {
error = copyin(uap->argp, &dumpmntopts, sizeof(dumpmntopts));
if (error == 0 && (dumpmntopts.ndmnt_blen < 256 ||
dumpmntopts.ndmnt_blen > 1024))
error = EINVAL;
if (error == 0)
error = nfsrv_lookupfilename(&nd,
dumpmntopts.ndmnt_fname, td);
if (error == 0 && strcmp(nd.ni_vp->v_mount->mnt_vfc->vfc_name,
"nfs") != 0) {
vput(nd.ni_vp);
error = EINVAL;
}
if (error == 0) {
buf = malloc(dumpmntopts.ndmnt_blen, M_TEMP, M_WAITOK |
M_ZERO);
nfscl_retopts(VFSTONFS(nd.ni_vp->v_mount), buf,
dumpmntopts.ndmnt_blen);
vput(nd.ni_vp);
error = copyout(buf, dumpmntopts.ndmnt_buf,
dumpmntopts.ndmnt_blen);
free(buf, M_TEMP);
}
} else if (uap->flag & NFSSVC_FORCEDISM) {
buf = malloc(MNAMELEN + 1, M_TEMP, M_WAITOK);
error = copyinstr(uap->argp, buf, MNAMELEN + 1, NULL);
if (error == 0) {
nmp = NULL;
mtx_lock(&mountlist_mtx);
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
if (strcmp(mp->mnt_stat.f_mntonname, buf) ==
0 && strcmp(mp->mnt_stat.f_fstypename,
"nfs") == 0 && mp->mnt_data != NULL) {
nmp = VFSTONFS(mp);
NFSDDSLOCK();
if (nfsv4_findmirror(nmp) != NULL) {
NFSDDSUNLOCK();
error = ENXIO;
nmp = NULL;
break;
}
mtx_lock(&nmp->nm_mtx);
if ((nmp->nm_privflag &
NFSMNTP_FORCEDISM) == 0) {
nmp->nm_privflag |=
(NFSMNTP_FORCEDISM |
NFSMNTP_CANCELRPCS);
mtx_unlock(&nmp->nm_mtx);
} else {
mtx_unlock(&nmp->nm_mtx);
nmp = NULL;
}
NFSDDSUNLOCK();
break;
}
}
mtx_unlock(&mountlist_mtx);
if (nmp != NULL) {
/*
* Call newnfs_nmcancelreqs() to cause
* any RPCs in progress on the mount point to
* fail.
* This will cause any process waiting for an
* RPC to complete while holding a vnode lock
* on the mounted-on vnode (such as "df" or
* a non-forced "umount") to fail.
* This will unlock the mounted-on vnode so
* a forced dismount can succeed.
* Then clear NFSMNTP_CANCELRPCS and wakeup(),
* so that nfs_unmount() can complete.
*/
newnfs_nmcancelreqs(nmp);
mtx_lock(&nmp->nm_mtx);
nmp->nm_privflag &= ~NFSMNTP_CANCELRPCS;
wakeup(nmp);
mtx_unlock(&nmp->nm_mtx);
} else if (error == 0)
error = EINVAL;
}
free(buf, M_TEMP);
} else {
error = EINVAL;
}
out:
NFSD_CURVNET_RESTORE();
return (error);
}
extern int (*nfsd_call_nfscl)(struct thread *, struct nfssvc_args *);
/*
* Called once to initialize data structures...
*/
static int
nfscl_modevent(module_t mod, int type, void *data)
{
int error = 0;
static int loaded = 0;
switch (type) {
case MOD_LOAD:
if (loaded)
return (0);
newnfs_portinit();
mtx_init(&ncl_iod_mutex, "ncl_iod_mutex", NULL, MTX_DEF);
nfscl_init();
NFSD_LOCK();
nfsrvd_cbinit(0);
NFSD_UNLOCK();
ncl_call_invalcaches = ncl_invalcaches;
nfsd_call_nfscl = nfssvc_nfscl;
loaded = 1;
break;
case MOD_UNLOAD:
if (nfs_numnfscbd != 0) {
error = EBUSY;
break;
}
/*
* XXX: Unloading of nfscl module is unsupported.
*/
#if 0
ncl_call_invalcaches = NULL;
nfsd_call_nfscl = NULL;
uma_zdestroy(ncl_pbuf_zone);
/* and get rid of the mutexes */
mtx_destroy(&ncl_iod_mutex);
loaded = 0;
break;
#else
/* FALLTHROUGH */
#endif
default:
error = EOPNOTSUPP;
break;
}
return error;
}
static moduledata_t nfscl_mod = {
"nfscl",
nfscl_modevent,
NULL,
};
/*
* This is the main module declaration for the NFS client. The
* nfscl_modevent() function is needed to ensure that the module
* cannot be unloaded, among other things.
* There is also a module declaration in sys/fs/nfsclient/nfs_clvfsops.c
* for the name "nfs" within the VFS_SET() macro that defines the "nfs"
* file system type.
*/
DECLARE_MODULE(nfscl, nfscl_mod, SI_SUB_VFS, SI_ORDER_FIRST);
/* So that loader and kldload(2) can find us, wherever we are.. */
MODULE_VERSION(nfscl, 1);
MODULE_DEPEND(nfscl, nfscommon, 1, 1, 1);
MODULE_DEPEND(nfscl, krpc, 1, 1, 1);
MODULE_DEPEND(nfscl, nfssvc, 1, 1, 1);
MODULE_DEPEND(nfscl, xdr, 1, 1, 1);
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