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freebsd-skq/sys/fs/nfsclient/nfs_clport.c
kib 85bc84ae65 Fix NFS client deadlock when read reports truncated node. 
If node attribute returned in the reply for read rpc indicate
truncation, and it happens that the vnode is exclusively locked,
update of the node attributes would try to shrink vnode size.  Since
during the read some vnode pages were busied by the reading thread,
vnode_pager_setsize() deadlocks waiting for the busy state owned by
the caller.

Use a thread-local flag to indicate that NFS read owns some (s)busy
pages states and postpone the call to vnode_pager_setsize() until the
thread relinguishes the ownership.

Diagnosed by:	rlibby
Tested by:	pho, rlibby
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2020-02-22 20:50:30 +00:00

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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>
__FBSDID("$FreeBSD$");
#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 <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 struct buf_ops buf_ops_newnfs;
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,
void *stuff, 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;
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_bufobj.bo_ops = &buf_ops_newnfs;
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 == 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, we have to attach the directory file handle and
* file name, so that Open Ops can be done later.
*/
if (nmp->nm_flag & NFSMNT_NFSV4) {
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);
}
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);
}
/*
* 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,
void *stuff, 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;
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_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.
*/
if ((np->n_vattr.na_fileid != 0 &&
np->n_vattr.na_fileid != nap->na_fileid) ||
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, if the node's fsid is not equal to the mount point's
* fsid, return the low order 32bits of the node's fsid. This
* allows getcwd(3) to work. There is a chance that the fsid might
* be the same as a local fs, but since this is in an NFS mount
* point, I don't think that will cause any problems?
*/
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])) {
/*
* va_fsid needs to be set to some value derived from
* np->n_vattr.na_filesid that is not equal
* vp->v_mount->mnt_stat.f_fsid[0], so that it changes
* from the value used for the top level server volume
* in the mounted subtree.
*/
vn_fsid(vp, vap);
if ((uint32_t)vap->va_fsid == np->n_vattr.na_filesid[0])
vap->va_fsid = hash32_buf(
np->n_vattr.na_filesid, 2 * sizeof(uint64_t), 0);
} else
vn_fsid(vp, vap);
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) {
NFSBCOPY((caddr_t)vap, (caddr_t)vaper, 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;
}
}
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, void *stuff)
{
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, stuff);
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 (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,
void *stuff)
{
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, void *stuff)
{
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 error, fibnum;
fibnum = curthread->td_proc->p_fibnum;
#endif
#ifdef INET
if (nmp->nm_nam->sa_family == AF_INET) {
struct sockaddr_in *sin;
struct nhop4_extended nh_ext;
sin = (struct sockaddr_in *)nmp->nm_nam;
CURVNET_SET(CRED_TO_VNET(nmp->nm_sockreq.nr_cred));
error = fib4_lookup_nh_ext(fibnum, sin->sin_addr, 0, 0,
&nh_ext);
CURVNET_RESTORE();
if (error != 0)
return (NULL);
if (IN_LOOPBACK(ntohl(nh_ext.nh_src.s_addr))) {
/* Ignore loopback addresses */
return (NULL);
}
*isinet6p = 0;
*((struct in_addr *)paddr) = nh_ext.nh_src;
return (u_int8_t *)paddr;
}
#endif
#ifdef INET6
if (nmp->nm_nam->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)nmp->nm_nam;
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();
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.
*/
APPLESTATIC 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_NOFILEHANDLE:
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);
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;
if (uap->flag & NFSSVC_CBADDSOCK) {
error = copyin(uap->argp, (caddr_t)&nfscbdarg, sizeof(nfscbdarg));
if (error)
return (error);
/*
* 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(&rights, CAP_SOCK_CLIENT), &fp);
if (error)
return (error);
if (fp->f_type != DTYPE_SOCKET) {
fdrop(fp, td);
return (EPERM);
}
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)
return (EINVAL);
error = copyin(uap->argp, (caddr_t)&nfscbdarg2,
sizeof(nfscbdarg2));
if (error)
return (error);
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);
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;
}
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,
};
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, nfslock, 1, 1, 1);
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