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freebsd-nq/sys/fs/nfsserver/nfs_nfsdstate.c
Rick Macklem b4a8d95279 Disable attempts to establish a callback connection from the 
experimental NFSv4 server to a NFSv4 client when delegations are not
being issued, even if the client advertises a callback path.
This avoids a problem where a Linux client advertises a
callback path that doesn't work, due to a firewall, and then
times out an Open attempt before the FreeBSD server gives up
its callback connection attempt. (Suggested by
drb at karlov.mff.cuni.cz to fix the Linux client problem that
he reported on the fs-stable mailing list.)
The server should probably have
a 1sec timeout on callback connection attempts when there are
no delegations issued to the client, but that patch will require
changes to the krpc and this serves as a work around until then.

Tested by:	drb at karlov.mff.cuni.cz
MFC after:	5 days
2010-12-09 19:02:23 +00:00

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/*-
* Copyright (c) 2009 Rick Macklem, University of Guelph
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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("$FreeBSD$");
#ifndef APPLEKEXT
#include <fs/nfs/nfsport.h>
struct nfsrv_stablefirst nfsrv_stablefirst;
int nfsrv_issuedelegs = 0;
int nfsrv_dolocallocks = 0;
struct nfsv4lock nfsv4rootfs_lock;
extern int newnfs_numnfsd;
extern struct nfsstats newnfsstats;
extern int nfsrv_lease;
extern struct timeval nfsboottime;
extern u_int32_t newnfs_true, newnfs_false;
NFSV4ROOTLOCKMUTEX;
NFSSTATESPINLOCK;
/*
* Hash lists for nfs V4.
* (Some would put them in the .h file, but I don't like declaring storage
* in a .h)
*/
struct nfsclienthashhead nfsclienthash[NFSCLIENTHASHSIZE];
struct nfslockhashhead nfslockhash[NFSLOCKHASHSIZE];
#endif /* !APPLEKEXT */
static u_int32_t nfsrv_openpluslock = 0, nfsrv_delegatecnt = 0;
static time_t nfsrvboottime;
static int nfsrv_writedelegifpos = 1;
static int nfsrv_returnoldstateid = 0, nfsrv_clients = 0;
static int nfsrv_clienthighwater = NFSRV_CLIENTHIGHWATER;
static int nfsrv_nogsscallback = 0;
/* local functions */
static void nfsrv_dumpaclient(struct nfsclient *clp,
struct nfsd_dumpclients *dumpp);
static void nfsrv_freeopenowner(struct nfsstate *stp, int cansleep,
NFSPROC_T *p);
static int nfsrv_freeopen(struct nfsstate *stp, vnode_t vp, int cansleep,
NFSPROC_T *p);
static void nfsrv_freelockowner(struct nfsstate *stp, vnode_t vp, int cansleep,
NFSPROC_T *p);
static void nfsrv_freeallnfslocks(struct nfsstate *stp, vnode_t vp,
int cansleep, NFSPROC_T *p);
static void nfsrv_freenfslock(struct nfslock *lop);
static void nfsrv_freenfslockfile(struct nfslockfile *lfp);
static void nfsrv_freedeleg(struct nfsstate *);
static int nfsrv_getstate(struct nfsclient *clp, nfsv4stateid_t *stateidp,
u_int32_t flags, struct nfsstate **stpp);
static void nfsrv_getowner(struct nfsstatehead *hp, struct nfsstate *new_stp,
struct nfsstate **stpp);
static int nfsrv_getlockfh(vnode_t vp, u_short flags,
struct nfslockfile **new_lfpp, fhandle_t *nfhp, NFSPROC_T *p);
static int nfsrv_getlockfile(u_short flags, struct nfslockfile **new_lfpp,
struct nfslockfile **lfpp, fhandle_t *nfhp, int lockit);
static void nfsrv_insertlock(struct nfslock *new_lop,
struct nfslock *insert_lop, struct nfsstate *stp, struct nfslockfile *lfp);
static void nfsrv_updatelock(struct nfsstate *stp, struct nfslock **new_lopp,
struct nfslock **other_lopp, struct nfslockfile *lfp);
static int nfsrv_getipnumber(u_char *cp);
static int nfsrv_checkrestart(nfsquad_t clientid, u_int32_t flags,
nfsv4stateid_t *stateidp, int specialid);
static int nfsrv_checkgrace(u_int32_t flags);
static int nfsrv_docallback(struct nfsclient *clp, int procnum,
nfsv4stateid_t *stateidp, int trunc, fhandle_t *fhp,
struct nfsvattr *nap, nfsattrbit_t *attrbitp, NFSPROC_T *p);
static u_int32_t nfsrv_nextclientindex(void);
static u_int32_t nfsrv_nextstateindex(struct nfsclient *clp);
static void nfsrv_markstable(struct nfsclient *clp);
static int nfsrv_checkstable(struct nfsclient *clp);
static int nfsrv_clientconflict(struct nfsclient *clp, int *haslockp, struct
vnode *vp, NFSPROC_T *p);
static int nfsrv_delegconflict(struct nfsstate *stp, int *haslockp,
NFSPROC_T *p, vnode_t vp);
static int nfsrv_cleandeleg(vnode_t vp, struct nfslockfile *lfp,
struct nfsclient *clp, int *haslockp, NFSPROC_T *p);
static int nfsrv_notsamecredname(struct nfsrv_descript *nd,
struct nfsclient *clp);
static time_t nfsrv_leaseexpiry(void);
static void nfsrv_delaydelegtimeout(struct nfsstate *stp);
static int nfsrv_checkseqid(struct nfsrv_descript *nd, u_int32_t seqid,
struct nfsstate *stp, struct nfsrvcache *op);
static int nfsrv_nootherstate(struct nfsstate *stp);
static int nfsrv_locallock(vnode_t vp, struct nfslockfile *lfp, int flags,
uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p);
static void nfsrv_localunlock(vnode_t vp, struct nfslockfile *lfp,
uint64_t init_first, uint64_t init_end, NFSPROC_T *p);
static int nfsrv_dolocal(vnode_t vp, struct nfslockfile *lfp, int flags,
int oldflags, uint64_t first, uint64_t end, struct nfslockconflict *cfp,
NFSPROC_T *p);
static void nfsrv_locallock_rollback(vnode_t vp, struct nfslockfile *lfp,
NFSPROC_T *p);
static void nfsrv_locallock_commit(struct nfslockfile *lfp, int flags,
uint64_t first, uint64_t end);
static void nfsrv_locklf(struct nfslockfile *lfp);
static void nfsrv_unlocklf(struct nfslockfile *lfp);
/*
* Scan the client list for a match and either return the current one,
* create a new entry or return an error.
* If returning a non-error, the clp structure must either be linked into
* the client list or free'd.
*/
APPLESTATIC int
nfsrv_setclient(struct nfsrv_descript *nd, struct nfsclient **new_clpp,
nfsquad_t *clientidp, nfsquad_t *confirmp, NFSPROC_T *p)
{
struct nfsclient *clp = NULL, *new_clp = *new_clpp;
int i;
struct nfsstate *stp, *tstp;
struct sockaddr_in *sad, *rad;
int zapit = 0, gotit, hasstate = 0, igotlock;
static u_int64_t confirm_index = 0;
/*
* Check for state resource limit exceeded.
*/
if (nfsrv_openpluslock > NFSRV_V4STATELIMIT)
return (NFSERR_RESOURCE);
if (nfsrv_issuedelegs == 0 ||
((nd->nd_flag & ND_GSS) != 0 && nfsrv_nogsscallback != 0))
/*
* Don't do callbacks when delegations are disabled or
* for AUTH_GSS unless enabled via nfsrv_nogsscallback.
* If establishing a callback connection is attempted
* when a firewall is blocking the callback path, the
* server may wait too long for the connect attempt to
* succeed during the Open. Some clients, such as Linux,
* may timeout and give up on the Open before the server
* replies. Also, since AUTH_GSS callbacks are not
* yet interoperability tested, they might cause the
* server to crap out, if they get past the Init call to
* the client.
*/
new_clp->lc_program = 0;
/* Lock out other nfsd threads */
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
do {
igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
NFSV4ROOTLOCKMUTEXPTR);
} while (!igotlock);
NFSUNLOCKV4ROOTMUTEX();
/*
* Search for a match in the client list.
*/
gotit = i = 0;
while (i < NFSCLIENTHASHSIZE && !gotit) {
LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
if (new_clp->lc_idlen == clp->lc_idlen &&
!NFSBCMP(new_clp->lc_id, clp->lc_id, clp->lc_idlen)) {
gotit = 1;
break;
}
}
i++;
}
if (!gotit ||
(clp->lc_flags & (LCL_NEEDSCONFIRM | LCL_ADMINREVOKED))) {
/*
* Get rid of the old one.
*/
if (i != NFSCLIENTHASHSIZE) {
LIST_REMOVE(clp, lc_hash);
nfsrv_cleanclient(clp, p);
nfsrv_freedeleglist(&clp->lc_deleg);
nfsrv_freedeleglist(&clp->lc_olddeleg);
zapit = 1;
}
/*
* Add it after assigning a client id to it.
*/
new_clp->lc_flags |= LCL_NEEDSCONFIRM;
confirmp->qval = new_clp->lc_confirm.qval = ++confirm_index;
clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
(u_int32_t)nfsrvboottime;
clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
nfsrv_nextclientindex();
new_clp->lc_stateindex = 0;
new_clp->lc_statemaxindex = 0;
new_clp->lc_cbref = 0;
new_clp->lc_expiry = nfsrv_leaseexpiry();
LIST_INIT(&new_clp->lc_open);
LIST_INIT(&new_clp->lc_deleg);
LIST_INIT(&new_clp->lc_olddeleg);
for (i = 0; i < NFSSTATEHASHSIZE; i++)
LIST_INIT(&new_clp->lc_stateid[i]);
LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
lc_hash);
newnfsstats.srvclients++;
nfsrv_openpluslock++;
nfsrv_clients++;
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
if (zapit)
nfsrv_zapclient(clp, p);
*new_clpp = NULL;
return (0);
}
/*
* Now, handle the cases where the id is already issued.
*/
if (nfsrv_notsamecredname(nd, clp)) {
/*
* Check to see if there is expired state that should go away.
*/
if (clp->lc_expiry < NFSD_MONOSEC &&
(!LIST_EMPTY(&clp->lc_open) || !LIST_EMPTY(&clp->lc_deleg))) {
nfsrv_cleanclient(clp, p);
nfsrv_freedeleglist(&clp->lc_deleg);
}
/*
* If there is outstanding state, then reply NFSERR_CLIDINUSE per
* RFC3530 Sec. 8.1.2 last para.
*/
if (!LIST_EMPTY(&clp->lc_deleg)) {
hasstate = 1;
} else if (LIST_EMPTY(&clp->lc_open)) {
hasstate = 0;
} else {
hasstate = 0;
/* Look for an Open on the OpenOwner */
LIST_FOREACH(stp, &clp->lc_open, ls_list) {
if (!LIST_EMPTY(&stp->ls_open)) {
hasstate = 1;
break;
}
}
}
if (hasstate) {
/*
* If the uid doesn't match, return NFSERR_CLIDINUSE after
* filling out the correct ipaddr and portnum.
*/
sad = NFSSOCKADDR(new_clp->lc_req.nr_nam, struct sockaddr_in *);
rad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr_in *);
sad->sin_addr.s_addr = rad->sin_addr.s_addr;
sad->sin_port = rad->sin_port;
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
return (NFSERR_CLIDINUSE);
}
}
if (NFSBCMP(new_clp->lc_verf, clp->lc_verf, NFSX_VERF)) {
/*
* If the verifier has changed, the client has rebooted
* and a new client id is issued. The old state info
* can be thrown away once the SETCLIENTID_CONFIRM occurs.
*/
LIST_REMOVE(clp, lc_hash);
new_clp->lc_flags |= LCL_NEEDSCONFIRM;
confirmp->qval = new_clp->lc_confirm.qval = ++confirm_index;
clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
nfsrvboottime;
clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
nfsrv_nextclientindex();
new_clp->lc_stateindex = 0;
new_clp->lc_statemaxindex = 0;
new_clp->lc_cbref = 0;
new_clp->lc_expiry = nfsrv_leaseexpiry();
/*
* Save the state until confirmed.
*/
LIST_NEWHEAD(&new_clp->lc_open, &clp->lc_open, ls_list);
LIST_FOREACH(tstp, &new_clp->lc_open, ls_list)
tstp->ls_clp = new_clp;
LIST_NEWHEAD(&new_clp->lc_deleg, &clp->lc_deleg, ls_list);
LIST_FOREACH(tstp, &new_clp->lc_deleg, ls_list)
tstp->ls_clp = new_clp;
LIST_NEWHEAD(&new_clp->lc_olddeleg, &clp->lc_olddeleg,
ls_list);
LIST_FOREACH(tstp, &new_clp->lc_olddeleg, ls_list)
tstp->ls_clp = new_clp;
for (i = 0; i < NFSSTATEHASHSIZE; i++) {
LIST_NEWHEAD(&new_clp->lc_stateid[i],
&clp->lc_stateid[i], ls_hash);
LIST_FOREACH(tstp, &new_clp->lc_stateid[i], ls_list)
tstp->ls_clp = new_clp;
}
LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
lc_hash);
newnfsstats.srvclients++;
nfsrv_openpluslock++;
nfsrv_clients++;
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
/*
* Must wait until any outstanding callback on the old clp
* completes.
*/
while (clp->lc_cbref) {
clp->lc_flags |= LCL_WAKEUPWANTED;
(void) tsleep((caddr_t)clp, PZERO - 1,
"nfsd clp", 10 * hz);
}
nfsrv_zapclient(clp, p);
*new_clpp = NULL;
return (0);
}
/*
* id and verifier match, so update the net address info
* and get rid of any existing callback authentication
* handle, so a new one will be acquired.
*/
LIST_REMOVE(clp, lc_hash);
new_clp->lc_flags |= (LCL_NEEDSCONFIRM | LCL_DONTCLEAN);
new_clp->lc_expiry = nfsrv_leaseexpiry();
confirmp->qval = new_clp->lc_confirm.qval = ++confirm_index;
clientidp->lval[0] = new_clp->lc_clientid.lval[0] =
clp->lc_clientid.lval[0];
clientidp->lval[1] = new_clp->lc_clientid.lval[1] =
clp->lc_clientid.lval[1];
new_clp->lc_delegtime = clp->lc_delegtime;
new_clp->lc_stateindex = clp->lc_stateindex;
new_clp->lc_statemaxindex = clp->lc_statemaxindex;
new_clp->lc_cbref = 0;
LIST_NEWHEAD(&new_clp->lc_open, &clp->lc_open, ls_list);
LIST_FOREACH(tstp, &new_clp->lc_open, ls_list)
tstp->ls_clp = new_clp;
LIST_NEWHEAD(&new_clp->lc_deleg, &clp->lc_deleg, ls_list);
LIST_FOREACH(tstp, &new_clp->lc_deleg, ls_list)
tstp->ls_clp = new_clp;
LIST_NEWHEAD(&new_clp->lc_olddeleg, &clp->lc_olddeleg, ls_list);
LIST_FOREACH(tstp, &new_clp->lc_olddeleg, ls_list)
tstp->ls_clp = new_clp;
for (i = 0; i < NFSSTATEHASHSIZE; i++) {
LIST_NEWHEAD(&new_clp->lc_stateid[i], &clp->lc_stateid[i],
ls_hash);
LIST_FOREACH(tstp, &new_clp->lc_stateid[i], ls_list)
tstp->ls_clp = new_clp;
}
LIST_INSERT_HEAD(NFSCLIENTHASH(new_clp->lc_clientid), new_clp,
lc_hash);
newnfsstats.srvclients++;
nfsrv_openpluslock++;
nfsrv_clients++;
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
/*
* Must wait until any outstanding callback on the old clp
* completes.
*/
while (clp->lc_cbref) {
clp->lc_flags |= LCL_WAKEUPWANTED;
(void) tsleep((caddr_t)clp, PZERO - 1, "nfsd clp", 10 * hz);
}
nfsrv_zapclient(clp, p);
*new_clpp = NULL;
return (0);
}
/*
* Check to see if the client id exists and optionally confirm it.
*/
APPLESTATIC int
nfsrv_getclient(nfsquad_t clientid, int opflags, struct nfsclient **clpp,
nfsquad_t confirm, struct nfsrv_descript *nd, NFSPROC_T *p)
{
struct nfsclient *clp;
struct nfsstate *stp;
int i;
struct nfsclienthashhead *hp;
int error = 0, igotlock, doneok;
if (clpp)
*clpp = NULL;
if (nfsrvboottime != clientid.lval[0])
return (NFSERR_STALECLIENTID);
/*
* If called with opflags == CLOPS_RENEW, the State Lock is
* already held. Otherwise, we need to get either that or,
* for the case of Confirm, lock out the nfsd threads.
*/
if (opflags & CLOPS_CONFIRM) {
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
do {
igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
NFSV4ROOTLOCKMUTEXPTR);
} while (!igotlock);
NFSUNLOCKV4ROOTMUTEX();
} else if (opflags != CLOPS_RENEW) {
NFSLOCKSTATE();
}
hp = NFSCLIENTHASH(clientid);
LIST_FOREACH(clp, hp, lc_hash) {
if (clp->lc_clientid.lval[1] == clientid.lval[1])
break;
}
if (clp == LIST_END(hp)) {
if (opflags & CLOPS_CONFIRM)
error = NFSERR_STALECLIENTID;
else
error = NFSERR_EXPIRED;
} else if (clp->lc_flags & LCL_ADMINREVOKED) {
/*
* If marked admin revoked, just return the error.
*/
error = NFSERR_ADMINREVOKED;
}
if (error) {
if (opflags & CLOPS_CONFIRM) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
} else if (opflags != CLOPS_RENEW) {
NFSUNLOCKSTATE();
}
return (error);
}
/*
* Perform any operations specified by the opflags.
*/
if (opflags & CLOPS_CONFIRM) {
if (clp->lc_confirm.qval != confirm.qval)
error = NFSERR_STALECLIENTID;
else if (nfsrv_notsamecredname(nd, clp))
error = NFSERR_CLIDINUSE;
if (!error) {
if ((clp->lc_flags & (LCL_NEEDSCONFIRM | LCL_DONTCLEAN)) ==
LCL_NEEDSCONFIRM) {
/*
* Hang onto the delegations (as old delegations)
* for an Open with CLAIM_DELEGATE_PREV unless in
* grace, but get rid of the rest of the state.
*/
nfsrv_cleanclient(clp, p);
nfsrv_freedeleglist(&clp->lc_olddeleg);
if (nfsrv_checkgrace(0)) {
/* In grace, so just delete delegations */
nfsrv_freedeleglist(&clp->lc_deleg);
} else {
LIST_FOREACH(stp, &clp->lc_deleg, ls_list)
stp->ls_flags |= NFSLCK_OLDDELEG;
clp->lc_delegtime = NFSD_MONOSEC +
nfsrv_lease + NFSRV_LEASEDELTA;
LIST_NEWHEAD(&clp->lc_olddeleg, &clp->lc_deleg,
ls_list);
}
}
clp->lc_flags &= ~(LCL_NEEDSCONFIRM | LCL_DONTCLEAN);
if (clp->lc_program)
clp->lc_flags |= LCL_NEEDSCBNULL;
}
} else if (clp->lc_flags & LCL_NEEDSCONFIRM) {
error = NFSERR_EXPIRED;
}
/*
* If called by the Renew Op, we must check the principal.
*/
if (!error && (opflags & CLOPS_RENEWOP)) {
if (nfsrv_notsamecredname(nd, clp)) {
doneok = 0;
for (i = 0; i < NFSSTATEHASHSIZE && doneok == 0; i++) {
LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
if ((stp->ls_flags & NFSLCK_OPEN) &&
stp->ls_uid == nd->nd_cred->cr_uid) {
doneok = 1;
break;
}
}
}
if (!doneok)
error = NFSERR_ACCES;
}
if (!error && (clp->lc_flags & LCL_CBDOWN))
error = NFSERR_CBPATHDOWN;
}
if ((!error || error == NFSERR_CBPATHDOWN) &&
(opflags & CLOPS_RENEW)) {
clp->lc_expiry = nfsrv_leaseexpiry();
}
if (opflags & CLOPS_CONFIRM) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
} else if (opflags != CLOPS_RENEW) {
NFSUNLOCKSTATE();
}
if (clpp)
*clpp = clp;
return (error);
}
/*
* Called from the new nfssvc syscall to admin revoke a clientid.
* Returns 0 for success, error otherwise.
*/
APPLESTATIC int
nfsrv_adminrevoke(struct nfsd_clid *revokep, NFSPROC_T *p)
{
struct nfsclient *clp = NULL;
int i;
int gotit, igotlock;
/*
* First, lock out the nfsd so that state won't change while the
* revocation record is being written to the stable storage restart
* file.
*/
NFSLOCKV4ROOTMUTEX();
do {
igotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
NFSV4ROOTLOCKMUTEXPTR);
} while (!igotlock);
NFSUNLOCKV4ROOTMUTEX();
/*
* Search for a match in the client list.
*/
gotit = i = 0;
while (i < NFSCLIENTHASHSIZE && !gotit) {
LIST_FOREACH(clp, &nfsclienthash[i], lc_hash) {
if (revokep->nclid_idlen == clp->lc_idlen &&
!NFSBCMP(revokep->nclid_id, clp->lc_id, clp->lc_idlen)) {
gotit = 1;
break;
}
}
i++;
}
if (!gotit) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 0);
NFSUNLOCKV4ROOTMUTEX();
return (EPERM);
}
/*
* Now, write out the revocation record
*/
nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
/*
* and clear out the state, marking the clientid revoked.
*/
clp->lc_flags &= ~LCL_CALLBACKSON;
clp->lc_flags |= LCL_ADMINREVOKED;
nfsrv_cleanclient(clp, p);
nfsrv_freedeleglist(&clp->lc_deleg);
nfsrv_freedeleglist(&clp->lc_olddeleg);
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 0);
NFSUNLOCKV4ROOTMUTEX();
return (0);
}
/*
* Dump out stats for all clients. Called from nfssvc(2), that is used
* newnfsstats.
*/
APPLESTATIC void
nfsrv_dumpclients(struct nfsd_dumpclients *dumpp, int maxcnt)
{
struct nfsclient *clp;
int i = 0, cnt = 0;
/*
* First, get a reference on the nfsv4rootfs_lock so that an
* exclusive lock cannot be acquired while dumping the clients.
*/
NFSLOCKV4ROOTMUTEX();
nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR);
NFSUNLOCKV4ROOTMUTEX();
NFSLOCKSTATE();
/*
* Rattle through the client lists until done.
*/
while (i < NFSCLIENTHASHSIZE && cnt < maxcnt) {
clp = LIST_FIRST(&nfsclienthash[i]);
while (clp != LIST_END(&nfsclienthash[i]) && cnt < maxcnt) {
nfsrv_dumpaclient(clp, &dumpp[cnt]);
cnt++;
clp = LIST_NEXT(clp, lc_hash);
}
i++;
}
if (cnt < maxcnt)
dumpp[cnt].ndcl_clid.nclid_idlen = 0;
NFSUNLOCKSTATE();
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
NFSUNLOCKV4ROOTMUTEX();
}
/*
* Dump stats for a client. Must be called with the NFSSTATELOCK and spl'd.
*/
static void
nfsrv_dumpaclient(struct nfsclient *clp, struct nfsd_dumpclients *dumpp)
{
struct nfsstate *stp, *openstp, *lckownstp;
struct nfslock *lop;
struct sockaddr *sad;
struct sockaddr_in *rad;
struct sockaddr_in6 *rad6;
dumpp->ndcl_nopenowners = dumpp->ndcl_nlockowners = 0;
dumpp->ndcl_nopens = dumpp->ndcl_nlocks = 0;
dumpp->ndcl_ndelegs = dumpp->ndcl_nolddelegs = 0;
dumpp->ndcl_flags = clp->lc_flags;
dumpp->ndcl_clid.nclid_idlen = clp->lc_idlen;
NFSBCOPY(clp->lc_id, dumpp->ndcl_clid.nclid_id, clp->lc_idlen);
sad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr *);
dumpp->ndcl_addrfam = sad->sa_family;
if (sad->sa_family == AF_INET) {
rad = (struct sockaddr_in *)sad;
dumpp->ndcl_cbaddr.sin_addr = rad->sin_addr;
} else {
rad6 = (struct sockaddr_in6 *)sad;
dumpp->ndcl_cbaddr.sin6_addr = rad6->sin6_addr;
}
/*
* Now, scan the state lists and total up the opens and locks.
*/
LIST_FOREACH(stp, &clp->lc_open, ls_list) {
dumpp->ndcl_nopenowners++;
LIST_FOREACH(openstp, &stp->ls_open, ls_list) {
dumpp->ndcl_nopens++;
LIST_FOREACH(lckownstp, &openstp->ls_open, ls_list) {
dumpp->ndcl_nlockowners++;
LIST_FOREACH(lop, &lckownstp->ls_lock, lo_lckowner) {
dumpp->ndcl_nlocks++;
}
}
}
}
/*
* and the delegation lists.
*/
LIST_FOREACH(stp, &clp->lc_deleg, ls_list) {
dumpp->ndcl_ndelegs++;
}
LIST_FOREACH(stp, &clp->lc_olddeleg, ls_list) {
dumpp->ndcl_nolddelegs++;
}
}
/*
* Dump out lock stats for a file.
*/
APPLESTATIC void
nfsrv_dumplocks(vnode_t vp, struct nfsd_dumplocks *ldumpp, int maxcnt,
NFSPROC_T *p)
{
struct nfsstate *stp;
struct nfslock *lop;
int cnt = 0;
struct nfslockfile *lfp;
struct sockaddr *sad;
struct sockaddr_in *rad;
struct sockaddr_in6 *rad6;
int ret;
fhandle_t nfh;
ret = nfsrv_getlockfh(vp, 0, NULL, &nfh, p);
/*
* First, get a reference on the nfsv4rootfs_lock so that an
* exclusive lock on it cannot be acquired while dumping the locks.
*/
NFSLOCKV4ROOTMUTEX();
nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR);
NFSUNLOCKV4ROOTMUTEX();
NFSLOCKSTATE();
if (!ret)
ret = nfsrv_getlockfile(0, NULL, &lfp, &nfh, 0);
if (ret) {
ldumpp[0].ndlck_clid.nclid_idlen = 0;
NFSUNLOCKSTATE();
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
NFSUNLOCKV4ROOTMUTEX();
return;
}
/*
* For each open share on file, dump it out.
*/
stp = LIST_FIRST(&lfp->lf_open);
while (stp != LIST_END(&lfp->lf_open) && cnt < maxcnt) {
ldumpp[cnt].ndlck_flags = stp->ls_flags;
ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
ldumpp[cnt].ndlck_owner.nclid_idlen =
stp->ls_openowner->ls_ownerlen;
NFSBCOPY(stp->ls_openowner->ls_owner,
ldumpp[cnt].ndlck_owner.nclid_id,
stp->ls_openowner->ls_ownerlen);
ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
stp->ls_clp->lc_idlen);
sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
ldumpp[cnt].ndlck_addrfam = sad->sa_family;
if (sad->sa_family == AF_INET) {
rad = (struct sockaddr_in *)sad;
ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
} else {
rad6 = (struct sockaddr_in6 *)sad;
ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
}
stp = LIST_NEXT(stp, ls_file);
cnt++;
}
/*
* and all locks.
*/
lop = LIST_FIRST(&lfp->lf_lock);
while (lop != LIST_END(&lfp->lf_lock) && cnt < maxcnt) {
stp = lop->lo_stp;
ldumpp[cnt].ndlck_flags = lop->lo_flags;
ldumpp[cnt].ndlck_first = lop->lo_first;
ldumpp[cnt].ndlck_end = lop->lo_end;
ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
ldumpp[cnt].ndlck_owner.nclid_idlen = stp->ls_ownerlen;
NFSBCOPY(stp->ls_owner, ldumpp[cnt].ndlck_owner.nclid_id,
stp->ls_ownerlen);
ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
stp->ls_clp->lc_idlen);
sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
ldumpp[cnt].ndlck_addrfam = sad->sa_family;
if (sad->sa_family == AF_INET) {
rad = (struct sockaddr_in *)sad;
ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
} else {
rad6 = (struct sockaddr_in6 *)sad;
ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
}
lop = LIST_NEXT(lop, lo_lckfile);
cnt++;
}
/*
* and the delegations.
*/
stp = LIST_FIRST(&lfp->lf_deleg);
while (stp != LIST_END(&lfp->lf_deleg) && cnt < maxcnt) {
ldumpp[cnt].ndlck_flags = stp->ls_flags;
ldumpp[cnt].ndlck_stateid.seqid = stp->ls_stateid.seqid;
ldumpp[cnt].ndlck_stateid.other[0] = stp->ls_stateid.other[0];
ldumpp[cnt].ndlck_stateid.other[1] = stp->ls_stateid.other[1];
ldumpp[cnt].ndlck_stateid.other[2] = stp->ls_stateid.other[2];
ldumpp[cnt].ndlck_owner.nclid_idlen = 0;
ldumpp[cnt].ndlck_clid.nclid_idlen = stp->ls_clp->lc_idlen;
NFSBCOPY(stp->ls_clp->lc_id, ldumpp[cnt].ndlck_clid.nclid_id,
stp->ls_clp->lc_idlen);
sad=NFSSOCKADDR(stp->ls_clp->lc_req.nr_nam, struct sockaddr *);
ldumpp[cnt].ndlck_addrfam = sad->sa_family;
if (sad->sa_family == AF_INET) {
rad = (struct sockaddr_in *)sad;
ldumpp[cnt].ndlck_cbaddr.sin_addr = rad->sin_addr;
} else {
rad6 = (struct sockaddr_in6 *)sad;
ldumpp[cnt].ndlck_cbaddr.sin6_addr = rad6->sin6_addr;
}
stp = LIST_NEXT(stp, ls_file);
cnt++;
}
/*
* If list isn't full, mark end of list by setting the client name
* to zero length.
*/
if (cnt < maxcnt)
ldumpp[cnt].ndlck_clid.nclid_idlen = 0;
NFSUNLOCKSTATE();
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
NFSUNLOCKV4ROOTMUTEX();
}
/*
* Server timer routine. It can scan any linked list, so long
* as it holds the spin/mutex lock and there is no exclusive lock on
* nfsv4rootfs_lock.
* (For OpenBSD, a kthread is ok. For FreeBSD, I think it is ok
* to do this from a callout, since the spin locks work. For
* Darwin, I'm not sure what will work correctly yet.)
* Should be called once per second.
*/
APPLESTATIC void
nfsrv_servertimer(void)
{
struct nfsclient *clp, *nclp;
struct nfsstate *stp, *nstp;
int got_ref, i;
/*
* Make sure nfsboottime is set. This is used by V3 as well
* as V4. Note that nfsboottime is not nfsrvboottime, which is
* only used by the V4 server for leases.
*/
if (nfsboottime.tv_sec == 0)
NFSSETBOOTTIME(nfsboottime);
/*
* If server hasn't started yet, just return.
*/
NFSLOCKSTATE();
if (nfsrv_stablefirst.nsf_eograce == 0) {
NFSUNLOCKSTATE();
return;
}
if (!(nfsrv_stablefirst.nsf_flags & NFSNSF_UPDATEDONE)) {
if (!(nfsrv_stablefirst.nsf_flags & NFSNSF_GRACEOVER) &&
NFSD_MONOSEC > nfsrv_stablefirst.nsf_eograce)
nfsrv_stablefirst.nsf_flags |=
(NFSNSF_GRACEOVER | NFSNSF_NEEDLOCK);
NFSUNLOCKSTATE();
return;
}
/*
* Try and get a reference count on the nfsv4rootfs_lock so that
* no nfsd thread can acquire an exclusive lock on it before this
* call is done. If it is already exclusively locked, just return.
*/
NFSLOCKV4ROOTMUTEX();
got_ref = nfsv4_getref_nonblock(&nfsv4rootfs_lock);
NFSUNLOCKV4ROOTMUTEX();
if (got_ref == 0) {
NFSUNLOCKSTATE();
return;
}
/*
* For each client...
*/
for (i = 0; i < NFSCLIENTHASHSIZE; i++) {
clp = LIST_FIRST(&nfsclienthash[i]);
while (clp != LIST_END(&nfsclienthash[i])) {
nclp = LIST_NEXT(clp, lc_hash);
if (!(clp->lc_flags & LCL_EXPIREIT)) {
if (((clp->lc_expiry + NFSRV_STALELEASE) < NFSD_MONOSEC
&& ((LIST_EMPTY(&clp->lc_deleg)
&& LIST_EMPTY(&clp->lc_open)) ||
nfsrv_clients > nfsrv_clienthighwater)) ||
(clp->lc_expiry + NFSRV_MOULDYLEASE) < NFSD_MONOSEC ||
(clp->lc_expiry < NFSD_MONOSEC &&
(nfsrv_openpluslock * 10 / 9) > NFSRV_V4STATELIMIT)) {
/*
* Lease has expired several nfsrv_lease times ago:
* PLUS
* - no state is associated with it
* OR
* - above high water mark for number of clients
* (nfsrv_clienthighwater should be large enough
* that this only occurs when clients fail to
* use the same nfs_client_id4.id. Maybe somewhat
* higher that the maximum number of clients that
* will mount this server?)
* OR
* Lease has expired a very long time ago
* OR
* Lease has expired PLUS the number of opens + locks
* has exceeded 90% of capacity
*
* --> Mark for expiry. The actual expiry will be done
* by an nfsd sometime soon.
*/
clp->lc_flags |= LCL_EXPIREIT;
nfsrv_stablefirst.nsf_flags |=
(NFSNSF_NEEDLOCK | NFSNSF_EXPIREDCLIENT);
} else {
/*
* If there are no opens, increment no open tick cnt
* If time exceeds NFSNOOPEN, mark it to be thrown away
* otherwise, if there is an open, reset no open time
* Hopefully, this will avoid excessive re-creation
* of open owners and subsequent open confirms.
*/
stp = LIST_FIRST(&clp->lc_open);
while (stp != LIST_END(&clp->lc_open)) {
nstp = LIST_NEXT(stp, ls_list);
if (LIST_EMPTY(&stp->ls_open)) {
stp->ls_noopens++;
if (stp->ls_noopens > NFSNOOPEN ||
(nfsrv_openpluslock * 2) >
NFSRV_V4STATELIMIT)
nfsrv_stablefirst.nsf_flags |=
NFSNSF_NOOPENS;
} else {
stp->ls_noopens = 0;
}
stp = nstp;
}
}
}
clp = nclp;
}
}
NFSUNLOCKSTATE();
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
NFSUNLOCKV4ROOTMUTEX();
}
/*
* The following set of functions free up the various data structures.
*/
/*
* Clear out all open/lock state related to this nfsclient.
* Caller must hold an exclusive lock on nfsv4rootfs_lock, so that
* there are no other active nfsd threads.
*/
APPLESTATIC void
nfsrv_cleanclient(struct nfsclient *clp, NFSPROC_T *p)
{
struct nfsstate *stp, *nstp;
LIST_FOREACH_SAFE(stp, &clp->lc_open, ls_list, nstp)
nfsrv_freeopenowner(stp, 1, p);
}
/*
* Free a client that has been cleaned. It should also already have been
* removed from the lists.
* (Just to be safe w.r.t. newnfs_disconnect(), call this function when
* softclock interrupts are enabled.)
*/
APPLESTATIC void
nfsrv_zapclient(struct nfsclient *clp, NFSPROC_T *p)
{
#ifdef notyet
if ((clp->lc_flags & (LCL_GSS | LCL_CALLBACKSON)) ==
(LCL_GSS | LCL_CALLBACKSON) &&
(clp->lc_hand.nfsh_flag & NFSG_COMPLETE) &&
clp->lc_handlelen > 0) {
clp->lc_hand.nfsh_flag &= ~NFSG_COMPLETE;
clp->lc_hand.nfsh_flag |= NFSG_DESTROYED;
(void) nfsrv_docallback(clp, NFSV4PROC_CBNULL,
NULL, 0, NULL, NULL, NULL, p);
}
#endif
newnfs_disconnect(&clp->lc_req);
NFSSOCKADDRFREE(clp->lc_req.nr_nam);
NFSFREEMUTEX(&clp->lc_req.nr_mtx);
free((caddr_t)clp, M_NFSDCLIENT);
NFSLOCKSTATE();
newnfsstats.srvclients--;
nfsrv_openpluslock--;
nfsrv_clients--;
NFSUNLOCKSTATE();
}
/*
* Free a list of delegation state structures.
* (This function will also free all nfslockfile structures that no
* longer have associated state.)
*/
APPLESTATIC void
nfsrv_freedeleglist(struct nfsstatehead *sthp)
{
struct nfsstate *stp, *nstp;
LIST_FOREACH_SAFE(stp, sthp, ls_list, nstp) {
nfsrv_freedeleg(stp);
}
LIST_INIT(sthp);
}
/*
* Free up a delegation.
*/
static void
nfsrv_freedeleg(struct nfsstate *stp)
{
struct nfslockfile *lfp;
LIST_REMOVE(stp, ls_hash);
LIST_REMOVE(stp, ls_list);
LIST_REMOVE(stp, ls_file);
lfp = stp->ls_lfp;
if (LIST_EMPTY(&lfp->lf_open) &&
LIST_EMPTY(&lfp->lf_lock) && LIST_EMPTY(&lfp->lf_deleg) &&
LIST_EMPTY(&lfp->lf_locallock) && LIST_EMPTY(&lfp->lf_rollback) &&
lfp->lf_usecount == 0 &&
nfsv4_testlock(&lfp->lf_locallock_lck) == 0)
nfsrv_freenfslockfile(lfp);
FREE((caddr_t)stp, M_NFSDSTATE);
newnfsstats.srvdelegates--;
nfsrv_openpluslock--;
nfsrv_delegatecnt--;
}
/*
* This function frees an open owner and all associated opens.
*/
static void
nfsrv_freeopenowner(struct nfsstate *stp, int cansleep, NFSPROC_T *p)
{
struct nfsstate *nstp, *tstp;
LIST_REMOVE(stp, ls_list);
/*
* Now, free all associated opens.
*/
nstp = LIST_FIRST(&stp->ls_open);
while (nstp != LIST_END(&stp->ls_open)) {
tstp = nstp;
nstp = LIST_NEXT(nstp, ls_list);
(void) nfsrv_freeopen(tstp, NULL, cansleep, p);
}
if (stp->ls_op)
nfsrvd_derefcache(stp->ls_op);
FREE((caddr_t)stp, M_NFSDSTATE);
newnfsstats.srvopenowners--;
nfsrv_openpluslock--;
}
/*
* This function frees an open (nfsstate open structure) with all associated
* lock_owners and locks. It also frees the nfslockfile structure iff there
* are no other opens on the file.
* Returns 1 if it free'd the nfslockfile, 0 otherwise.
*/
static int
nfsrv_freeopen(struct nfsstate *stp, vnode_t vp, int cansleep, NFSPROC_T *p)
{
struct nfsstate *nstp, *tstp;
struct nfslockfile *lfp;
int ret;
LIST_REMOVE(stp, ls_hash);
LIST_REMOVE(stp, ls_list);
LIST_REMOVE(stp, ls_file);
lfp = stp->ls_lfp;
/*
* Now, free all lockowners associated with this open.
*/
LIST_FOREACH_SAFE(tstp, &stp->ls_open, ls_list, nstp)
nfsrv_freelockowner(tstp, vp, cansleep, p);
/*
* The nfslockfile is freed here if there are no locks
* associated with the open.
* If there are locks associated with the open, the
* nfslockfile structure can be freed via nfsrv_freelockowner().
* Acquire the state mutex to avoid races with calls to
* nfsrv_getlockfile().
*/
if (cansleep != 0)
NFSLOCKSTATE();
if (lfp != NULL && LIST_EMPTY(&lfp->lf_open) &&
LIST_EMPTY(&lfp->lf_deleg) && LIST_EMPTY(&lfp->lf_lock) &&
LIST_EMPTY(&lfp->lf_locallock) && LIST_EMPTY(&lfp->lf_rollback) &&
lfp->lf_usecount == 0 &&
(cansleep != 0 || nfsv4_testlock(&lfp->lf_locallock_lck) == 0)) {
nfsrv_freenfslockfile(lfp);
ret = 1;
} else
ret = 0;
if (cansleep != 0)
NFSUNLOCKSTATE();
FREE((caddr_t)stp, M_NFSDSTATE);
newnfsstats.srvopens--;
nfsrv_openpluslock--;
return (ret);
}
/*
* Frees a lockowner and all associated locks.
*/
static void
nfsrv_freelockowner(struct nfsstate *stp, vnode_t vp, int cansleep,
NFSPROC_T *p)
{
LIST_REMOVE(stp, ls_hash);
LIST_REMOVE(stp, ls_list);
nfsrv_freeallnfslocks(stp, vp, cansleep, p);
if (stp->ls_op)
nfsrvd_derefcache(stp->ls_op);
FREE((caddr_t)stp, M_NFSDSTATE);
newnfsstats.srvlockowners--;
nfsrv_openpluslock--;
}
/*
* Free all the nfs locks on a lockowner.
*/
static void
nfsrv_freeallnfslocks(struct nfsstate *stp, vnode_t vp, int cansleep,
NFSPROC_T *p)
{
struct nfslock *lop, *nlop;
struct nfsrollback *rlp, *nrlp;
struct nfslockfile *lfp = NULL;
int gottvp = 0;
vnode_t tvp = NULL;
uint64_t first, end;
lop = LIST_FIRST(&stp->ls_lock);
while (lop != LIST_END(&stp->ls_lock)) {
nlop = LIST_NEXT(lop, lo_lckowner);
/*
* Since all locks should be for the same file, lfp should
* not change.
*/
if (lfp == NULL)
lfp = lop->lo_lfp;
else if (lfp != lop->lo_lfp)
panic("allnfslocks");
/*
* If vp is NULL and cansleep != 0, a vnode must be acquired
* from the file handle. This only occurs when called from
* nfsrv_cleanclient().
*/
if (gottvp == 0) {
if (nfsrv_dolocallocks == 0)
tvp = NULL;
else if (vp == NULL && cansleep != 0)
tvp = nfsvno_getvp(&lfp->lf_fh);
else
tvp = vp;
gottvp = 1;
}
if (tvp != NULL) {
if (cansleep == 0)
panic("allnfs2");
first = lop->lo_first;
end = lop->lo_end;
nfsrv_freenfslock(lop);
nfsrv_localunlock(tvp, lfp, first, end, p);
LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list,
nrlp)
free(rlp, M_NFSDROLLBACK);
LIST_INIT(&lfp->lf_rollback);
} else
nfsrv_freenfslock(lop);
lop = nlop;
}
if (vp == NULL && tvp != NULL)
vput(tvp);
}
/*
* Free an nfslock structure.
*/
static void
nfsrv_freenfslock(struct nfslock *lop)
{
if (lop->lo_lckfile.le_prev != NULL) {
LIST_REMOVE(lop, lo_lckfile);
newnfsstats.srvlocks--;
nfsrv_openpluslock--;
}
LIST_REMOVE(lop, lo_lckowner);
FREE((caddr_t)lop, M_NFSDLOCK);
}
/*
* This function frees an nfslockfile structure.
*/
static void
nfsrv_freenfslockfile(struct nfslockfile *lfp)
{
LIST_REMOVE(lfp, lf_hash);
FREE((caddr_t)lfp, M_NFSDLOCKFILE);
}
/*
* This function looks up an nfsstate structure via stateid.
*/
static int
nfsrv_getstate(struct nfsclient *clp, nfsv4stateid_t *stateidp, __unused u_int32_t flags,
struct nfsstate **stpp)
{
struct nfsstate *stp;
struct nfsstatehead *hp;
*stpp = NULL;
hp = NFSSTATEHASH(clp, *stateidp);
LIST_FOREACH(stp, hp, ls_hash) {
if (!NFSBCMP(stp->ls_stateid.other, stateidp->other,
NFSX_STATEIDOTHER))
break;
}
/*
* If no state id in list, return NFSERR_BADSTATEID.
*/
if (stp == LIST_END(hp))
return (NFSERR_BADSTATEID);
*stpp = stp;
return (0);
}
/*
* This function gets an nfsstate structure via owner string.
*/
static void
nfsrv_getowner(struct nfsstatehead *hp, struct nfsstate *new_stp,
struct nfsstate **stpp)
{
struct nfsstate *stp;
*stpp = NULL;
LIST_FOREACH(stp, hp, ls_list) {
if (new_stp->ls_ownerlen == stp->ls_ownerlen &&
!NFSBCMP(new_stp->ls_owner,stp->ls_owner,stp->ls_ownerlen)) {
*stpp = stp;
return;
}
}
}
/*
* Lock control function called to update lock status.
* Returns 0 upon success, -1 if there is no lock and the flags indicate
* that one isn't to be created and an NFSERR_xxx for other errors.
* The structures new_stp and new_lop are passed in as pointers that should
* be set to NULL if the structure is used and shouldn't be free'd.
* For the NFSLCK_TEST and NFSLCK_CHECK cases, the structures are
* never used and can safely be allocated on the stack. For all other
* cases, *new_stpp and *new_lopp should be malloc'd before the call,
* in case they are used.
*/
APPLESTATIC int
nfsrv_lockctrl(vnode_t vp, struct nfsstate **new_stpp,
struct nfslock **new_lopp, struct nfslockconflict *cfp,
nfsquad_t clientid, nfsv4stateid_t *stateidp,
__unused struct nfsexstuff *exp,
struct nfsrv_descript *nd, NFSPROC_T *p)
{
struct nfslock *lop;
struct nfsstate *new_stp = *new_stpp;
struct nfslock *new_lop = *new_lopp;
struct nfsstate *tstp, *mystp, *nstp;
int specialid = 0;
struct nfslockfile *lfp;
struct nfslock *other_lop = NULL;
struct nfsstate *stp, *lckstp = NULL;
struct nfsclient *clp = NULL;
u_int32_t bits;
int error = 0, haslock = 0, ret, reterr;
int getlckret, delegation = 0, filestruct_locked;
fhandle_t nfh;
uint64_t first, end;
uint32_t lock_flags;
if (new_stp->ls_flags & (NFSLCK_CHECK | NFSLCK_SETATTR)) {
/*
* Note the special cases of "all 1s" or "all 0s" stateids and
* let reads with all 1s go ahead.
*/
if (new_stp->ls_stateid.seqid == 0x0 &&
new_stp->ls_stateid.other[0] == 0x0 &&
new_stp->ls_stateid.other[1] == 0x0 &&
new_stp->ls_stateid.other[2] == 0x0)
specialid = 1;
else if (new_stp->ls_stateid.seqid == 0xffffffff &&
new_stp->ls_stateid.other[0] == 0xffffffff &&
new_stp->ls_stateid.other[1] == 0xffffffff &&
new_stp->ls_stateid.other[2] == 0xffffffff)
specialid = 2;
}
/*
* Check for restart conditions (client and server).
*/
error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
&new_stp->ls_stateid, specialid);
if (error)
return (error);
/*
* Check for state resource limit exceeded.
*/
if ((new_stp->ls_flags & NFSLCK_LOCK) &&
nfsrv_openpluslock > NFSRV_V4STATELIMIT)
return (NFSERR_RESOURCE);
/*
* For the lock case, get another nfslock structure,
* just in case we need it.
* Malloc now, before we start sifting through the linked lists,
* in case we have to wait for memory.
*/
tryagain:
if (new_stp->ls_flags & NFSLCK_LOCK)
MALLOC(other_lop, struct nfslock *, sizeof (struct nfslock),
M_NFSDLOCK, M_WAITOK);
filestruct_locked = 0;
reterr = 0;
lfp = NULL;
/*
* Get the lockfile structure for CFH now, so we can do a sanity
* check against the stateid, before incrementing the seqid#, since
* we want to return NFSERR_BADSTATEID on failure and the seqid#
* shouldn't be incremented for this case.
* If nfsrv_getlockfile() returns -1, it means "not found", which
* will be handled later.
* If we are doing Lock/LockU and local locking is enabled, sleep
* lock the nfslockfile structure.
*/
getlckret = nfsrv_getlockfh(vp, new_stp->ls_flags, NULL, &nfh, p);
NFSLOCKSTATE();
if (getlckret == 0) {
if ((new_stp->ls_flags & (NFSLCK_LOCK | NFSLCK_UNLOCK)) != 0 &&
nfsrv_dolocallocks != 0 && nd->nd_repstat == 0) {
getlckret = nfsrv_getlockfile(new_stp->ls_flags, NULL,
&lfp, &nfh, 1);
if (getlckret == 0)
filestruct_locked = 1;
} else
getlckret = nfsrv_getlockfile(new_stp->ls_flags, NULL,
&lfp, &nfh, 0);
}
if (getlckret != 0 && getlckret != -1)
reterr = getlckret;
if (filestruct_locked != 0) {
LIST_INIT(&lfp->lf_rollback);
if ((new_stp->ls_flags & NFSLCK_LOCK)) {
/*
* For local locking, do the advisory locking now, so
* that any conflict can be detected. A failure later
* can be rolled back locally. If an error is returned,
* struct nfslockfile has been unlocked and any local
* locking rolled back.
*/
NFSUNLOCKSTATE();
reterr = nfsrv_locallock(vp, lfp,
(new_lop->lo_flags & (NFSLCK_READ | NFSLCK_WRITE)),
new_lop->lo_first, new_lop->lo_end, cfp, p);
NFSLOCKSTATE();
}
}
if (specialid == 0) {
if (new_stp->ls_flags & NFSLCK_TEST) {
/*
* RFC 3530 does not list LockT as an op that renews a
* lease, but the concensus seems to be that it is ok
* for a server to do so.
*/
error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp,
(nfsquad_t)((u_quad_t)0), NULL, p);
/*
* Since NFSERR_EXPIRED, NFSERR_ADMINREVOKED are not valid
* error returns for LockT, just go ahead and test for a lock,
* since there are no locks for this client, but other locks
* can conflict. (ie. same client will always be false)
*/
if (error == NFSERR_EXPIRED || error == NFSERR_ADMINREVOKED)
error = 0;
lckstp = new_stp;
} else {
error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp,
(nfsquad_t)((u_quad_t)0), NULL, p);
if (error == 0)
/*
* Look up the stateid
*/
error = nfsrv_getstate(clp, &new_stp->ls_stateid,
new_stp->ls_flags, &stp);
/*
* do some sanity checks for an unconfirmed open or a
* stateid that refers to the wrong file, for an open stateid
*/
if (error == 0 && (stp->ls_flags & NFSLCK_OPEN) &&
((stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM) ||
(getlckret == 0 && stp->ls_lfp != lfp)))
error = NFSERR_BADSTATEID;
if (error == 0 &&
(stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) &&
getlckret == 0 && stp->ls_lfp != lfp)
error = NFSERR_BADSTATEID;
/*
* If the lockowner stateid doesn't refer to the same file,
* I believe that is considered ok, since some clients will
* only create a single lockowner and use that for all locks
* on all files.
* For now, log it as a diagnostic, instead of considering it
* a BadStateid.
*/
if (error == 0 && (stp->ls_flags &
(NFSLCK_OPEN | NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) == 0 &&
getlckret == 0 && stp->ls_lfp != lfp) {
#ifdef DIAGNOSTIC
printf("Got a lock statid for different file open\n");
#endif
/*
error = NFSERR_BADSTATEID;
*/
}
if (error == 0) {
if (new_stp->ls_flags & NFSLCK_OPENTOLOCK) {
/*
* If haslock set, we've already checked the seqid.
*/
if (!haslock) {
if (stp->ls_flags & NFSLCK_OPEN)
error = nfsrv_checkseqid(nd, new_stp->ls_seq,
stp->ls_openowner, new_stp->ls_op);
else
error = NFSERR_BADSTATEID;
}
if (!error)
nfsrv_getowner(&stp->ls_open, new_stp, &lckstp);
if (lckstp)
/*
* I believe this should be an error, but it
* isn't obvious what NFSERR_xxx would be
* appropriate, so I'll use NFSERR_INVAL for now.
*/
error = NFSERR_INVAL;
else
lckstp = new_stp;
} else if (new_stp->ls_flags&(NFSLCK_LOCK|NFSLCK_UNLOCK)) {
/*
* If haslock set, ditto above.
*/
if (!haslock) {
if (stp->ls_flags & NFSLCK_OPEN)
error = NFSERR_BADSTATEID;
else
error = nfsrv_checkseqid(nd, new_stp->ls_seq,
stp, new_stp->ls_op);
}
lckstp = stp;
} else {
lckstp = stp;
}
}
/*
* If the seqid part of the stateid isn't the same, return
* NFSERR_OLDSTATEID for cases other than I/O Ops.
* For I/O Ops, only return NFSERR_OLDSTATEID if
* nfsrv_returnoldstateid is set. (The concensus on the email
* list was that most clients would prefer to not receive
* NFSERR_OLDSTATEID for I/O Ops, but the RFC suggests that that
* is what will happen, so I use the nfsrv_returnoldstateid to
* allow for either server configuration.)
*/
if (!error && stp->ls_stateid.seqid!=new_stp->ls_stateid.seqid &&
(!(new_stp->ls_flags & NFSLCK_CHECK) ||
nfsrv_returnoldstateid))
error = NFSERR_OLDSTATEID;
}
}
/*
* Now we can check for grace.
*/
if (!error)
error = nfsrv_checkgrace(new_stp->ls_flags);
if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error &&
nfsrv_checkstable(clp))
error = NFSERR_NOGRACE;
/*
* If we successfully Reclaimed state, note that.
*/
if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error)
nfsrv_markstable(clp);
/*
* At this point, either error == NFSERR_BADSTATEID or the
* seqid# has been updated, so we can return any error.
* If error == 0, there may be an error in:
* nd_repstat - Set by the calling function.
* reterr - Set above, if getting the nfslockfile structure
* or acquiring the local lock failed.
* (If both of these are set, nd_repstat should probably be
* returned, since that error was detected before this
* function call.)
*/
if (error != 0 || nd->nd_repstat != 0 || reterr != 0) {
if (error == 0) {
if (nd->nd_repstat != 0)
error = nd->nd_repstat;
else
error = reterr;
}
if (filestruct_locked != 0) {
/* Roll back local locks. */
NFSUNLOCKSTATE();
nfsrv_locallock_rollback(vp, lfp, p);
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
}
NFSUNLOCKSTATE();
if (other_lop)
FREE((caddr_t)other_lop, M_NFSDLOCK);
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (error);
}
/*
* Check the nfsrv_getlockfile return.
* Returned -1 if no structure found.
*/
if (getlckret == -1) {
error = NFSERR_EXPIRED;
/*
* Called from lockt, so no lock is OK.
*/
if (new_stp->ls_flags & NFSLCK_TEST) {
error = 0;
} else if (new_stp->ls_flags &
(NFSLCK_CHECK | NFSLCK_SETATTR)) {
/*
* Called to check for a lock, OK if the stateid is all
* 1s or all 0s, but there should be an nfsstate
* otherwise.
* (ie. If there is no open, I'll assume no share
* deny bits.)
*/
if (specialid)
error = 0;
else
error = NFSERR_BADSTATEID;
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
/*
* Called to lock or unlock, so the lock has gone away.
*/
return (error);
}
/*
* For NFSLCK_CHECK and NFSLCK_LOCK, test for a share conflict.
* For NFSLCK_CHECK, allow a read if write access is granted,
* but check for a deny. For NFSLCK_LOCK, require correct access,
* which implies a conflicting deny can't exist.
*/
if (new_stp->ls_flags & (NFSLCK_CHECK | NFSLCK_LOCK)) {
/*
* Four kinds of state id:
* - specialid (all 0s or all 1s), only for NFSLCK_CHECK
* - stateid for an open
* - stateid for a delegation
* - stateid for a lock owner
*/
if (!specialid) {
if (stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) {
delegation = 1;
mystp = stp;
nfsrv_delaydelegtimeout(stp);
} else if (stp->ls_flags & NFSLCK_OPEN) {
mystp = stp;
} else {
mystp = stp->ls_openstp;
}
/*
* If locking or checking, require correct access
* bit set.
*/
if (((new_stp->ls_flags & NFSLCK_LOCK) &&
!((new_lop->lo_flags >> NFSLCK_LOCKSHIFT) &
mystp->ls_flags & NFSLCK_ACCESSBITS)) ||
((new_stp->ls_flags & (NFSLCK_CHECK|NFSLCK_READACCESS)) ==
(NFSLCK_CHECK | NFSLCK_READACCESS) &&
!(mystp->ls_flags & NFSLCK_READACCESS)) ||
((new_stp->ls_flags & (NFSLCK_CHECK|NFSLCK_WRITEACCESS)) ==
(NFSLCK_CHECK | NFSLCK_WRITEACCESS) &&
!(mystp->ls_flags & NFSLCK_WRITEACCESS))) {
if (filestruct_locked != 0) {
/* Roll back local locks. */
NFSUNLOCKSTATE();
nfsrv_locallock_rollback(vp, lfp, p);
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
}
NFSUNLOCKSTATE();
if (other_lop)
FREE((caddr_t)other_lop, M_NFSDLOCK);
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (NFSERR_OPENMODE);
}
} else
mystp = NULL;
if ((new_stp->ls_flags & NFSLCK_CHECK) && !delegation) {
/*
* Check for a conflicting deny bit.
*/
LIST_FOREACH(tstp, &lfp->lf_open, ls_file) {
if (tstp != mystp) {
bits = tstp->ls_flags;
bits >>= NFSLCK_SHIFT;
if (new_stp->ls_flags & bits & NFSLCK_ACCESSBITS) {
ret = nfsrv_clientconflict(tstp->ls_clp, &haslock,
vp, p);
if (ret) {
/*
* nfsrv_clientconflict unlocks state
* when it returns non-zero.
*/
lckstp = NULL;
goto tryagain;
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (NFSERR_OPENMODE);
}
}
}
/* We're outta here */
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (0);
}
}
/*
* For setattr, just get rid of all the Delegations for other clients.
*/
if (new_stp->ls_flags & NFSLCK_SETATTR) {
ret = nfsrv_cleandeleg(vp, lfp, clp, &haslock, p);
if (ret) {
/*
* nfsrv_cleandeleg() unlocks state when it
* returns non-zero.
*/
if (ret == -1) {
lckstp = NULL;
goto tryagain;
}
return (ret);
}
if (!(new_stp->ls_flags & NFSLCK_CHECK) ||
(LIST_EMPTY(&lfp->lf_open) && LIST_EMPTY(&lfp->lf_lock) &&
LIST_EMPTY(&lfp->lf_deleg))) {
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (0);
}
}
/*
* Check for a conflicting delegation. If one is found, call
* nfsrv_delegconflict() to handle it. If the v4root lock hasn't
* been set yet, it will get the lock. Otherwise, it will recall
* the delegation. Then, we try try again...
* I currently believe the conflict algorithm to be:
* For Lock Ops (Lock/LockT/LockU)
* - there is a conflict iff a different client has a write delegation
* For Reading (Read Op)
* - there is a conflict iff a different client has a write delegation
* (the specialids are always a different client)
* For Writing (Write/Setattr of size)
* - there is a conflict if a different client has any delegation
* - there is a conflict if the same client has a read delegation
* (I don't understand why this isn't allowed, but that seems to be
* the current concensus?)
*/
tstp = LIST_FIRST(&lfp->lf_deleg);
while (tstp != LIST_END(&lfp->lf_deleg)) {
nstp = LIST_NEXT(tstp, ls_file);
if ((((new_stp->ls_flags&(NFSLCK_LOCK|NFSLCK_UNLOCK|NFSLCK_TEST))||
((new_stp->ls_flags & NFSLCK_CHECK) &&
(new_lop->lo_flags & NFSLCK_READ))) &&
clp != tstp->ls_clp &&
(tstp->ls_flags & NFSLCK_DELEGWRITE)) ||
((new_stp->ls_flags & NFSLCK_CHECK) &&
(new_lop->lo_flags & NFSLCK_WRITE) &&
(clp != tstp->ls_clp ||
(tstp->ls_flags & NFSLCK_DELEGREAD)))) {
if (filestruct_locked != 0) {
/* Roll back local locks. */
NFSUNLOCKSTATE();
nfsrv_locallock_rollback(vp, lfp, p);
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
}
ret = nfsrv_delegconflict(tstp, &haslock, p, vp);
if (ret) {
/*
* nfsrv_delegconflict unlocks state when it
* returns non-zero, which it always does.
*/
if (other_lop) {
FREE((caddr_t)other_lop, M_NFSDLOCK);
other_lop = NULL;
}
if (ret == -1) {
lckstp = NULL;
goto tryagain;
}
return (ret);
}
/* Never gets here. */
}
tstp = nstp;
}
/*
* Handle the unlock case by calling nfsrv_updatelock().
* (Should I have done some access checking above for unlock? For now,
* just let it happen.)
*/
if (new_stp->ls_flags & NFSLCK_UNLOCK) {
first = new_lop->lo_first;
end = new_lop->lo_end;
nfsrv_updatelock(stp, new_lopp, &other_lop, lfp);
stateidp->seqid = ++(stp->ls_stateid.seqid);
stateidp->other[0] = stp->ls_stateid.other[0];
stateidp->other[1] = stp->ls_stateid.other[1];
stateidp->other[2] = stp->ls_stateid.other[2];
if (filestruct_locked != 0) {
NFSUNLOCKSTATE();
/* Update the local locks. */
nfsrv_localunlock(vp, lfp, first, end, p);
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (0);
}
/*
* Search for a conflicting lock. A lock conflicts if:
* - the lock range overlaps and
* - at least one lock is a write lock and
* - it is not owned by the same lock owner
*/
if (!delegation) {
LIST_FOREACH(lop, &lfp->lf_lock, lo_lckfile) {
if (new_lop->lo_end > lop->lo_first &&
new_lop->lo_first < lop->lo_end &&
(new_lop->lo_flags == NFSLCK_WRITE ||
lop->lo_flags == NFSLCK_WRITE) &&
lckstp != lop->lo_stp &&
(clp != lop->lo_stp->ls_clp ||
lckstp->ls_ownerlen != lop->lo_stp->ls_ownerlen ||
NFSBCMP(lckstp->ls_owner, lop->lo_stp->ls_owner,
lckstp->ls_ownerlen))) {
if (other_lop) {
FREE((caddr_t)other_lop, M_NFSDLOCK);
other_lop = NULL;
}
ret = nfsrv_clientconflict(lop->lo_stp->ls_clp,&haslock,vp,p);
if (ret) {
if (filestruct_locked != 0) {
/* Roll back local locks. */
nfsrv_locallock_rollback(vp, lfp, p);
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
NFSUNLOCKSTATE();
}
/*
* nfsrv_clientconflict() unlocks state when it
* returns non-zero.
*/
lckstp = NULL;
goto tryagain;
}
/*
* Found a conflicting lock, so record the conflict and
* return the error.
*/
if (cfp) {
cfp->cl_clientid.lval[0]=lop->lo_stp->ls_stateid.other[0];
cfp->cl_clientid.lval[1]=lop->lo_stp->ls_stateid.other[1];
cfp->cl_first = lop->lo_first;
cfp->cl_end = lop->lo_end;
cfp->cl_flags = lop->lo_flags;
cfp->cl_ownerlen = lop->lo_stp->ls_ownerlen;
NFSBCOPY(lop->lo_stp->ls_owner, cfp->cl_owner,
cfp->cl_ownerlen);
}
if (new_stp->ls_flags & NFSLCK_RECLAIM)
error = NFSERR_RECLAIMCONFLICT;
else if (new_stp->ls_flags & NFSLCK_CHECK)
error = NFSERR_LOCKED;
else
error = NFSERR_DENIED;
if (filestruct_locked != 0) {
/* Roll back local locks. */
NFSUNLOCKSTATE();
nfsrv_locallock_rollback(vp, lfp, p);
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (error);
}
}
}
/*
* We only get here if there was no lock that conflicted.
*/
if (new_stp->ls_flags & (NFSLCK_TEST | NFSLCK_CHECK)) {
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (0);
}
/*
* We only get here when we are creating or modifying a lock.
* There are two variants:
* - exist_lock_owner where lock_owner exists
* - open_to_lock_owner with new lock_owner
*/
first = new_lop->lo_first;
end = new_lop->lo_end;
lock_flags = new_lop->lo_flags;
if (!(new_stp->ls_flags & NFSLCK_OPENTOLOCK)) {
nfsrv_updatelock(lckstp, new_lopp, &other_lop, lfp);
stateidp->seqid = ++(lckstp->ls_stateid.seqid);
stateidp->other[0] = lckstp->ls_stateid.other[0];
stateidp->other[1] = lckstp->ls_stateid.other[1];
stateidp->other[2] = lckstp->ls_stateid.other[2];
} else {
/*
* The new open_to_lock_owner case.
* Link the new nfsstate into the lists.
*/
new_stp->ls_seq = new_stp->ls_opentolockseq;
nfsrvd_refcache(new_stp->ls_op);
stateidp->seqid = new_stp->ls_stateid.seqid = 0;
stateidp->other[0] = new_stp->ls_stateid.other[0] =
clp->lc_clientid.lval[0];
stateidp->other[1] = new_stp->ls_stateid.other[1] =
clp->lc_clientid.lval[1];
stateidp->other[2] = new_stp->ls_stateid.other[2] =
nfsrv_nextstateindex(clp);
new_stp->ls_clp = clp;
LIST_INIT(&new_stp->ls_lock);
new_stp->ls_openstp = stp;
new_stp->ls_lfp = lfp;
nfsrv_insertlock(new_lop, (struct nfslock *)new_stp, new_stp,
lfp);
LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_stp->ls_stateid),
new_stp, ls_hash);
LIST_INSERT_HEAD(&stp->ls_open, new_stp, ls_list);
*new_lopp = NULL;
*new_stpp = NULL;
newnfsstats.srvlockowners++;
nfsrv_openpluslock++;
}
if (filestruct_locked != 0) {
NFSUNLOCKSTATE();
nfsrv_locallock_commit(lfp, lock_flags, first, end);
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
if (other_lop)
FREE((caddr_t)other_lop, M_NFSDLOCK);
return (0);
}
/*
* Check for state errors for Open.
* repstat is passed back out as an error if more critical errors
* are not detected.
*/
APPLESTATIC int
nfsrv_opencheck(nfsquad_t clientid, nfsv4stateid_t *stateidp,
struct nfsstate *new_stp, vnode_t vp, struct nfsrv_descript *nd,
NFSPROC_T *p, int repstat)
{
struct nfsstate *stp, *nstp;
struct nfsclient *clp;
struct nfsstate *ownerstp;
struct nfslockfile *lfp, *new_lfp;
int error, haslock = 0, ret, readonly = 0, getfhret = 0;
if ((new_stp->ls_flags & NFSLCK_SHAREBITS) == NFSLCK_READACCESS)
readonly = 1;
/*
* Check for restart conditions (client and server).
*/
error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
&new_stp->ls_stateid, 0);
if (error)
return (error);
/*
* Check for state resource limit exceeded.
* Technically this should be SMP protected, but the worst
* case error is "out by one or two" on the count when it
* returns NFSERR_RESOURCE and the limit is just a rather
* arbitrary high water mark, so no harm is done.
*/
if (nfsrv_openpluslock > NFSRV_V4STATELIMIT)
return (NFSERR_RESOURCE);
tryagain:
MALLOC(new_lfp, struct nfslockfile *, sizeof (struct nfslockfile),
M_NFSDLOCKFILE, M_WAITOK);
if (vp)
getfhret = nfsrv_getlockfh(vp, new_stp->ls_flags, &new_lfp,
NULL, p);
NFSLOCKSTATE();
/*
* Get the nfsclient structure.
*/
error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp,
(nfsquad_t)((u_quad_t)0), NULL, p);
/*
* Look up the open owner. See if it needs confirmation and
* check the seq#, as required.
*/
if (!error)
nfsrv_getowner(&clp->lc_open, new_stp, &ownerstp);
if (!error && ownerstp) {
error = nfsrv_checkseqid(nd, new_stp->ls_seq, ownerstp,
new_stp->ls_op);
/*
* If the OpenOwner hasn't been confirmed, assume the
* old one was a replay and this one is ok.
* See: RFC3530 Sec. 14.2.18.
*/
if (error == NFSERR_BADSEQID &&
(ownerstp->ls_flags & NFSLCK_NEEDSCONFIRM))
error = 0;
}
/*
* Check for grace.
*/
if (!error)
error = nfsrv_checkgrace(new_stp->ls_flags);
if ((new_stp->ls_flags & NFSLCK_RECLAIM) && !error &&
nfsrv_checkstable(clp))
error = NFSERR_NOGRACE;
/*
* If none of the above errors occurred, let repstat be
* returned.
*/
if (repstat && !error)
error = repstat;
if (error) {
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
free((caddr_t)new_lfp, M_NFSDLOCKFILE);
return (error);
}
/*
* If vp == NULL, the file doesn't exist yet, so return ok.
* (This always happens on the first pass, so haslock must be 0.)
*/
if (vp == NULL) {
NFSUNLOCKSTATE();
FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
return (0);
}
/*
* Get the structure for the underlying file.
*/
if (getfhret)
error = getfhret;
else
error = nfsrv_getlockfile(new_stp->ls_flags, &new_lfp, &lfp,
NULL, 0);
if (new_lfp)
FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
if (error) {
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (error);
}
/*
* Search for a conflicting open/share.
*/
if (new_stp->ls_flags & NFSLCK_DELEGCUR) {
/*
* For Delegate_Cur, search for the matching Delegation,
* which indicates no conflict.
* An old delegation should have been recovered by the
* client doing a Claim_DELEGATE_Prev, so I won't let
* it match and return NFSERR_EXPIRED. Should I let it
* match?
*/
LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
if (!(stp->ls_flags & NFSLCK_OLDDELEG) &&
stateidp->seqid == stp->ls_stateid.seqid &&
!NFSBCMP(stateidp->other, stp->ls_stateid.other,
NFSX_STATEIDOTHER))
break;
}
if (stp == LIST_END(&lfp->lf_deleg) ||
((new_stp->ls_flags & NFSLCK_WRITEACCESS) &&
(stp->ls_flags & NFSLCK_DELEGREAD))) {
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (NFSERR_EXPIRED);
}
}
/*
* Check for access/deny bit conflicts. I check for the same
* owner as well, in case the client didn't bother.
*/
LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
if (!(new_stp->ls_flags & NFSLCK_DELEGCUR) &&
(((new_stp->ls_flags & NFSLCK_ACCESSBITS) &
((stp->ls_flags>>NFSLCK_SHIFT) & NFSLCK_ACCESSBITS))||
((stp->ls_flags & NFSLCK_ACCESSBITS) &
((new_stp->ls_flags>>NFSLCK_SHIFT)&NFSLCK_ACCESSBITS)))){
ret = nfsrv_clientconflict(stp->ls_clp,&haslock,vp,p);
if (ret) {
/*
* nfsrv_clientconflict() unlocks
* state when it returns non-zero.
*/
goto tryagain;
}
if (new_stp->ls_flags & NFSLCK_RECLAIM)
error = NFSERR_RECLAIMCONFLICT;
else
error = NFSERR_SHAREDENIED;
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (error);
}
}
/*
* Check for a conflicting delegation. If one is found, call
* nfsrv_delegconflict() to handle it. If the v4root lock hasn't
* been set yet, it will get the lock. Otherwise, it will recall
* the delegation. Then, we try try again...
* (If NFSLCK_DELEGCUR is set, it has a delegation, so there
* isn't a conflict.)
* I currently believe the conflict algorithm to be:
* For Open with Read Access and Deny None
* - there is a conflict iff a different client has a write delegation
* For Open with other Write Access or any Deny except None
* - there is a conflict if a different client has any delegation
* - there is a conflict if the same client has a read delegation
* (The current concensus is that this last case should be
* considered a conflict since the client with a read delegation
* could have done an Open with ReadAccess and WriteDeny
* locally and then not have checked for the WriteDeny.)
* Don't check for a Reclaim, since that will be dealt with
* by nfsrv_openctrl().
*/
if (!(new_stp->ls_flags &
(NFSLCK_DELEGPREV | NFSLCK_DELEGCUR | NFSLCK_RECLAIM))) {
stp = LIST_FIRST(&lfp->lf_deleg);
while (stp != LIST_END(&lfp->lf_deleg)) {
nstp = LIST_NEXT(stp, ls_file);
if ((readonly && stp->ls_clp != clp &&
(stp->ls_flags & NFSLCK_DELEGWRITE)) ||
(!readonly && (stp->ls_clp != clp ||
(stp->ls_flags & NFSLCK_DELEGREAD)))) {
ret = nfsrv_delegconflict(stp, &haslock, p, vp);
if (ret) {
/*
* nfsrv_delegconflict() unlocks state
* when it returns non-zero.
*/
if (ret == -1)
goto tryagain;
return (ret);
}
}
stp = nstp;
}
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (0);
}
/*
* Open control function to create/update open state for an open.
*/
APPLESTATIC int
nfsrv_openctrl(struct nfsrv_descript *nd, vnode_t vp,
struct nfsstate **new_stpp, nfsquad_t clientid, nfsv4stateid_t *stateidp,
nfsv4stateid_t *delegstateidp, u_int32_t *rflagsp, struct nfsexstuff *exp,
NFSPROC_T *p, u_quad_t filerev)
{
struct nfsstate *new_stp = *new_stpp;
struct nfsstate *stp, *nstp;
struct nfsstate *openstp = NULL, *new_open, *ownerstp, *new_deleg;
struct nfslockfile *lfp, *new_lfp;
struct nfsclient *clp;
int error, haslock = 0, ret, delegate = 1, writedeleg = 1;
int readonly = 0, cbret = 1, getfhret = 0;
if ((new_stp->ls_flags & NFSLCK_SHAREBITS) == NFSLCK_READACCESS)
readonly = 1;
/*
* Check for restart conditions (client and server).
* (Paranoia, should have been detected by nfsrv_opencheck().)
* If an error does show up, return NFSERR_EXPIRED, since the
* the seqid# has already been incremented.
*/
error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
&new_stp->ls_stateid, 0);
if (error) {
printf("Nfsd: openctrl unexpected restart err=%d\n",
error);
return (NFSERR_EXPIRED);
}
tryagain:
MALLOC(new_lfp, struct nfslockfile *, sizeof (struct nfslockfile),
M_NFSDLOCKFILE, M_WAITOK);
MALLOC(new_open, struct nfsstate *, sizeof (struct nfsstate),
M_NFSDSTATE, M_WAITOK);
MALLOC(new_deleg, struct nfsstate *, sizeof (struct nfsstate),
M_NFSDSTATE, M_WAITOK);
getfhret = nfsrv_getlockfh(vp, new_stp->ls_flags, &new_lfp,
NULL, p);
NFSLOCKSTATE();
/*
* Get the client structure. Since the linked lists could be changed
* by other nfsd processes if this process does a tsleep(), one of
* two things must be done.
* 1 - don't tsleep()
* or
* 2 - get the nfsv4_lock() { indicated by haslock == 1 }
* before using the lists, since this lock stops the other
* nfsd. This should only be used for rare cases, since it
* essentially single threads the nfsd.
* At this time, it is only done for cases where the stable
* storage file must be written prior to completion of state
* expiration.
*/
error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp,
(nfsquad_t)((u_quad_t)0), NULL, p);
if (!error && (clp->lc_flags & LCL_NEEDSCBNULL) &&
clp->lc_program) {
/*
* This happens on the first open for a client
* that supports callbacks.
*/
NFSUNLOCKSTATE();
/*
* Although nfsrv_docallback() will sleep, clp won't
* go away, since they are only removed when the
* nfsv4_lock() has blocked the nfsd threads. The
* fields in clp can change, but having multiple
* threads do this Null callback RPC should be
* harmless.
*/
cbret = nfsrv_docallback(clp, NFSV4PROC_CBNULL,
NULL, 0, NULL, NULL, NULL, p);
NFSLOCKSTATE();
clp->lc_flags &= ~LCL_NEEDSCBNULL;
if (!cbret)
clp->lc_flags |= LCL_CALLBACKSON;
}
/*
* Look up the open owner. See if it needs confirmation and
* check the seq#, as required.
*/
if (!error)
nfsrv_getowner(&clp->lc_open, new_stp, &ownerstp);
if (error) {
NFSUNLOCKSTATE();
printf("Nfsd: openctrl unexpected state err=%d\n",
error);
free((caddr_t)new_lfp, M_NFSDLOCKFILE);
free((caddr_t)new_open, M_NFSDSTATE);
free((caddr_t)new_deleg, M_NFSDSTATE);
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (NFSERR_EXPIRED);
}
if (new_stp->ls_flags & NFSLCK_RECLAIM)
nfsrv_markstable(clp);
/*
* Get the structure for the underlying file.
*/
if (getfhret)
error = getfhret;
else
error = nfsrv_getlockfile(new_stp->ls_flags, &new_lfp, &lfp,
NULL, 0);
if (new_lfp)
FREE((caddr_t)new_lfp, M_NFSDLOCKFILE);
if (error) {
NFSUNLOCKSTATE();
printf("Nfsd openctrl unexpected getlockfile err=%d\n",
error);
free((caddr_t)new_open, M_NFSDSTATE);
free((caddr_t)new_deleg, M_NFSDSTATE);
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (error);
}
/*
* Search for a conflicting open/share.
*/
if (new_stp->ls_flags & NFSLCK_DELEGCUR) {
/*
* For Delegate_Cur, search for the matching Delegation,
* which indicates no conflict.
* An old delegation should have been recovered by the
* client doing a Claim_DELEGATE_Prev, so I won't let
* it match and return NFSERR_EXPIRED. Should I let it
* match?
*/
LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
if (!(stp->ls_flags & NFSLCK_OLDDELEG) &&
stateidp->seqid == stp->ls_stateid.seqid &&
!NFSBCMP(stateidp->other, stp->ls_stateid.other,
NFSX_STATEIDOTHER))
break;
}
if (stp == LIST_END(&lfp->lf_deleg) ||
((new_stp->ls_flags & NFSLCK_WRITEACCESS) &&
(stp->ls_flags & NFSLCK_DELEGREAD))) {
NFSUNLOCKSTATE();
printf("Nfsd openctrl unexpected expiry\n");
free((caddr_t)new_open, M_NFSDSTATE);
free((caddr_t)new_deleg, M_NFSDSTATE);
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (NFSERR_EXPIRED);
}
/*
* Don't issue a Delegation, since one already exists and
* delay delegation timeout, as required.
*/
delegate = 0;
nfsrv_delaydelegtimeout(stp);
}
/*
* Check for access/deny bit conflicts. I also check for the
* same owner, since the client might not have bothered to check.
* Also, note an open for the same file and owner, if found,
* which is all we do here for Delegate_Cur, since conflict
* checking is already done.
*/
LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
if (ownerstp && stp->ls_openowner == ownerstp)
openstp = stp;
if (!(new_stp->ls_flags & NFSLCK_DELEGCUR)) {
/*
* If another client has the file open, the only
* delegation that can be issued is a Read delegation
* and only if it is a Read open with Deny none.
*/
if (clp != stp->ls_clp) {
if ((stp->ls_flags & NFSLCK_SHAREBITS) ==
NFSLCK_READACCESS)
writedeleg = 0;
else
delegate = 0;
}
if(((new_stp->ls_flags & NFSLCK_ACCESSBITS) &
((stp->ls_flags>>NFSLCK_SHIFT) & NFSLCK_ACCESSBITS))||
((stp->ls_flags & NFSLCK_ACCESSBITS) &
((new_stp->ls_flags>>NFSLCK_SHIFT)&NFSLCK_ACCESSBITS))){
ret = nfsrv_clientconflict(stp->ls_clp,&haslock,vp,p);
if (ret) {
/*
* nfsrv_clientconflict() unlocks state
* when it returns non-zero.
*/
free((caddr_t)new_open, M_NFSDSTATE);
free((caddr_t)new_deleg, M_NFSDSTATE);
openstp = NULL;
goto tryagain;
}
if (new_stp->ls_flags & NFSLCK_RECLAIM)
error = NFSERR_RECLAIMCONFLICT;
else
error = NFSERR_SHAREDENIED;
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
free((caddr_t)new_open, M_NFSDSTATE);
free((caddr_t)new_deleg, M_NFSDSTATE);
printf("nfsd openctrl unexpected client cnfl\n");
return (error);
}
}
}
/*
* Check for a conflicting delegation. If one is found, call
* nfsrv_delegconflict() to handle it. If the v4root lock hasn't
* been set yet, it will get the lock. Otherwise, it will recall
* the delegation. Then, we try try again...
* (If NFSLCK_DELEGCUR is set, it has a delegation, so there
* isn't a conflict.)
* I currently believe the conflict algorithm to be:
* For Open with Read Access and Deny None
* - there is a conflict iff a different client has a write delegation
* For Open with other Write Access or any Deny except None
* - there is a conflict if a different client has any delegation
* - there is a conflict if the same client has a read delegation
* (The current concensus is that this last case should be
* considered a conflict since the client with a read delegation
* could have done an Open with ReadAccess and WriteDeny
* locally and then not have checked for the WriteDeny.)
*/
if (!(new_stp->ls_flags & (NFSLCK_DELEGPREV | NFSLCK_DELEGCUR))) {
stp = LIST_FIRST(&lfp->lf_deleg);
while (stp != LIST_END(&lfp->lf_deleg)) {
nstp = LIST_NEXT(stp, ls_file);
if (stp->ls_clp != clp && (stp->ls_flags & NFSLCK_DELEGREAD))
writedeleg = 0;
else
delegate = 0;
if ((readonly && stp->ls_clp != clp &&
(stp->ls_flags & NFSLCK_DELEGWRITE)) ||
(!readonly && (stp->ls_clp != clp ||
(stp->ls_flags & NFSLCK_DELEGREAD)))) {
if (new_stp->ls_flags & NFSLCK_RECLAIM) {
delegate = 2;
} else {
ret = nfsrv_delegconflict(stp, &haslock, p, vp);
if (ret) {
/*
* nfsrv_delegconflict() unlocks state
* when it returns non-zero.
*/
printf("Nfsd openctrl unexpected deleg cnfl\n");
free((caddr_t)new_open, M_NFSDSTATE);
free((caddr_t)new_deleg, M_NFSDSTATE);
if (ret == -1) {
openstp = NULL;
goto tryagain;
}
return (ret);
}
}
}
stp = nstp;
}
}
/*
* We only get here if there was no open that conflicted.
* If an open for the owner exists, or in the access/deny bits.
* Otherwise it is a new open. If the open_owner hasn't been
* confirmed, replace the open with the new one needing confirmation,
* otherwise add the open.
*/
if (new_stp->ls_flags & NFSLCK_DELEGPREV) {
/*
* Handle NFSLCK_DELEGPREV by searching the old delegations for
* a match. If found, just move the old delegation to the current
* delegation list and issue open. If not found, return
* NFSERR_EXPIRED.
*/
LIST_FOREACH(stp, &clp->lc_olddeleg, ls_list) {
if (stp->ls_lfp == lfp) {
/* Found it */
if (stp->ls_clp != clp)
panic("olddeleg clp");
LIST_REMOVE(stp, ls_list);
LIST_REMOVE(stp, ls_hash);
stp->ls_flags &= ~NFSLCK_OLDDELEG;
stp->ls_stateid.seqid = delegstateidp->seqid = 0;
stp->ls_stateid.other[0] = delegstateidp->other[0] =
clp->lc_clientid.lval[0];
stp->ls_stateid.other[1] = delegstateidp->other[1] =
clp->lc_clientid.lval[1];
stp->ls_stateid.other[2] = delegstateidp->other[2] =
nfsrv_nextstateindex(clp);
stp->ls_compref = nd->nd_compref;
LIST_INSERT_HEAD(&clp->lc_deleg, stp, ls_list);
LIST_INSERT_HEAD(NFSSTATEHASH(clp,
stp->ls_stateid), stp, ls_hash);
if (stp->ls_flags & NFSLCK_DELEGWRITE)
*rflagsp |= NFSV4OPEN_WRITEDELEGATE;
else
*rflagsp |= NFSV4OPEN_READDELEGATE;
clp->lc_delegtime = NFSD_MONOSEC +
nfsrv_lease + NFSRV_LEASEDELTA;
/*
* Now, do the associated open.
*/
new_open->ls_stateid.seqid = 0;
new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
new_open->ls_flags = (new_stp->ls_flags&NFSLCK_DENYBITS)|
NFSLCK_OPEN;
if (stp->ls_flags & NFSLCK_DELEGWRITE)
new_open->ls_flags |= (NFSLCK_READACCESS |
NFSLCK_WRITEACCESS);
else
new_open->ls_flags |= NFSLCK_READACCESS;
new_open->ls_uid = new_stp->ls_uid;
new_open->ls_lfp = lfp;
new_open->ls_clp = clp;
LIST_INIT(&new_open->ls_open);
LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
new_open, ls_hash);
/*
* and handle the open owner
*/
if (ownerstp) {
new_open->ls_openowner = ownerstp;
LIST_INSERT_HEAD(&ownerstp->ls_open,new_open,ls_list);
} else {
new_open->ls_openowner = new_stp;
new_stp->ls_flags = 0;
nfsrvd_refcache(new_stp->ls_op);
new_stp->ls_noopens = 0;
LIST_INIT(&new_stp->ls_open);
LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
*new_stpp = NULL;
newnfsstats.srvopenowners++;
nfsrv_openpluslock++;
}
openstp = new_open;
new_open = NULL;
newnfsstats.srvopens++;
nfsrv_openpluslock++;
break;
}
}
if (stp == LIST_END(&clp->lc_olddeleg))
error = NFSERR_EXPIRED;
} else if (new_stp->ls_flags & (NFSLCK_DELEGREAD | NFSLCK_DELEGWRITE)) {
/*
* Scan to see that no delegation for this client and file
* doesn't already exist.
* There also shouldn't yet be an Open for this file and
* openowner.
*/
LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
if (stp->ls_clp == clp)
break;
}
if (stp == LIST_END(&lfp->lf_deleg) && openstp == NULL) {
/*
* This is the Claim_Previous case with a delegation
* type != Delegate_None.
*/
/*
* First, add the delegation. (Although we must issue the
* delegation, we can also ask for an immediate return.)
*/
new_deleg->ls_stateid.seqid = delegstateidp->seqid = 0;
new_deleg->ls_stateid.other[0] = delegstateidp->other[0] =
clp->lc_clientid.lval[0];
new_deleg->ls_stateid.other[1] = delegstateidp->other[1] =
clp->lc_clientid.lval[1];
new_deleg->ls_stateid.other[2] = delegstateidp->other[2] =
nfsrv_nextstateindex(clp);
if (new_stp->ls_flags & NFSLCK_DELEGWRITE) {
new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
*rflagsp |= NFSV4OPEN_WRITEDELEGATE;
} else {
new_deleg->ls_flags = (NFSLCK_DELEGREAD |
NFSLCK_READACCESS);
*rflagsp |= NFSV4OPEN_READDELEGATE;
}
new_deleg->ls_uid = new_stp->ls_uid;
new_deleg->ls_lfp = lfp;
new_deleg->ls_clp = clp;
new_deleg->ls_filerev = filerev;
new_deleg->ls_compref = nd->nd_compref;
LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
LIST_INSERT_HEAD(NFSSTATEHASH(clp,
new_deleg->ls_stateid), new_deleg, ls_hash);
LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
new_deleg = NULL;
if (delegate == 2 || nfsrv_issuedelegs == 0 ||
(clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) !=
LCL_CALLBACKSON ||
NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt) ||
!NFSVNO_DELEGOK(vp))
*rflagsp |= NFSV4OPEN_RECALL;
newnfsstats.srvdelegates++;
nfsrv_openpluslock++;
nfsrv_delegatecnt++;
/*
* Now, do the associated open.
*/
new_open->ls_stateid.seqid = 0;
new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
new_open->ls_flags = (new_stp->ls_flags & NFSLCK_DENYBITS) |
NFSLCK_OPEN;
if (new_stp->ls_flags & NFSLCK_DELEGWRITE)
new_open->ls_flags |= (NFSLCK_READACCESS |
NFSLCK_WRITEACCESS);
else
new_open->ls_flags |= NFSLCK_READACCESS;
new_open->ls_uid = new_stp->ls_uid;
new_open->ls_lfp = lfp;
new_open->ls_clp = clp;
LIST_INIT(&new_open->ls_open);
LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
new_open, ls_hash);
/*
* and handle the open owner
*/
if (ownerstp) {
new_open->ls_openowner = ownerstp;
LIST_INSERT_HEAD(&ownerstp->ls_open, new_open, ls_list);
} else {
new_open->ls_openowner = new_stp;
new_stp->ls_flags = 0;
nfsrvd_refcache(new_stp->ls_op);
new_stp->ls_noopens = 0;
LIST_INIT(&new_stp->ls_open);
LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
*new_stpp = NULL;
newnfsstats.srvopenowners++;
nfsrv_openpluslock++;
}
openstp = new_open;
new_open = NULL;
newnfsstats.srvopens++;
nfsrv_openpluslock++;
} else {
error = NFSERR_RECLAIMCONFLICT;
}
} else if (ownerstp) {
if (ownerstp->ls_flags & NFSLCK_NEEDSCONFIRM) {
/* Replace the open */
if (ownerstp->ls_op)
nfsrvd_derefcache(ownerstp->ls_op);
ownerstp->ls_op = new_stp->ls_op;
nfsrvd_refcache(ownerstp->ls_op);
ownerstp->ls_seq = new_stp->ls_seq;
*rflagsp |= NFSV4OPEN_RESULTCONFIRM;
stp = LIST_FIRST(&ownerstp->ls_open);
stp->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS) |
NFSLCK_OPEN;
stp->ls_stateid.seqid = 0;
stp->ls_uid = new_stp->ls_uid;
if (lfp != stp->ls_lfp) {
LIST_REMOVE(stp, ls_file);
LIST_INSERT_HEAD(&lfp->lf_open, stp, ls_file);
stp->ls_lfp = lfp;
}
openstp = stp;
} else if (openstp) {
openstp->ls_flags |= (new_stp->ls_flags & NFSLCK_SHAREBITS);
openstp->ls_stateid.seqid++;
/*
* This is where we can choose to issue a delegation.
*/
if (delegate && nfsrv_issuedelegs &&
writedeleg && !NFSVNO_EXRDONLY(exp) &&
(nfsrv_writedelegifpos || !readonly) &&
(clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) ==
LCL_CALLBACKSON &&
!NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt) &&
NFSVNO_DELEGOK(vp)) {
new_deleg->ls_stateid.seqid = delegstateidp->seqid = 0;
new_deleg->ls_stateid.other[0] = delegstateidp->other[0]
= clp->lc_clientid.lval[0];
new_deleg->ls_stateid.other[1] = delegstateidp->other[1]
= clp->lc_clientid.lval[1];
new_deleg->ls_stateid.other[2] = delegstateidp->other[2]
= nfsrv_nextstateindex(clp);
new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
*rflagsp |= NFSV4OPEN_WRITEDELEGATE;
new_deleg->ls_uid = new_stp->ls_uid;
new_deleg->ls_lfp = lfp;
new_deleg->ls_clp = clp;
new_deleg->ls_filerev = filerev;
new_deleg->ls_compref = nd->nd_compref;
LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
LIST_INSERT_HEAD(NFSSTATEHASH(clp,
new_deleg->ls_stateid), new_deleg, ls_hash);
LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
new_deleg = NULL;
newnfsstats.srvdelegates++;
nfsrv_openpluslock++;
nfsrv_delegatecnt++;
}
} else {
new_open->ls_stateid.seqid = 0;
new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
new_open->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS)|
NFSLCK_OPEN;
new_open->ls_uid = new_stp->ls_uid;
new_open->ls_openowner = ownerstp;
new_open->ls_lfp = lfp;
new_open->ls_clp = clp;
LIST_INIT(&new_open->ls_open);
LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
LIST_INSERT_HEAD(&ownerstp->ls_open, new_open, ls_list);
LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
new_open, ls_hash);
openstp = new_open;
new_open = NULL;
newnfsstats.srvopens++;
nfsrv_openpluslock++;
/*
* This is where we can choose to issue a delegation.
*/
if (delegate && nfsrv_issuedelegs &&
(writedeleg || readonly) &&
(clp->lc_flags & (LCL_CALLBACKSON | LCL_CBDOWN)) ==
LCL_CALLBACKSON &&
!NFSRV_V4DELEGLIMIT(nfsrv_delegatecnt) &&
NFSVNO_DELEGOK(vp)) {
new_deleg->ls_stateid.seqid = delegstateidp->seqid = 0;
new_deleg->ls_stateid.other[0] = delegstateidp->other[0]
= clp->lc_clientid.lval[0];
new_deleg->ls_stateid.other[1] = delegstateidp->other[1]
= clp->lc_clientid.lval[1];
new_deleg->ls_stateid.other[2] = delegstateidp->other[2]
= nfsrv_nextstateindex(clp);
if (writedeleg && !NFSVNO_EXRDONLY(exp) &&
(nfsrv_writedelegifpos || !readonly)) {
new_deleg->ls_flags = (NFSLCK_DELEGWRITE |
NFSLCK_READACCESS | NFSLCK_WRITEACCESS);
*rflagsp |= NFSV4OPEN_WRITEDELEGATE;
} else {
new_deleg->ls_flags = (NFSLCK_DELEGREAD |
NFSLCK_READACCESS);
*rflagsp |= NFSV4OPEN_READDELEGATE;
}
new_deleg->ls_uid = new_stp->ls_uid;
new_deleg->ls_lfp = lfp;
new_deleg->ls_clp = clp;
new_deleg->ls_filerev = filerev;
new_deleg->ls_compref = nd->nd_compref;
LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file);
LIST_INSERT_HEAD(NFSSTATEHASH(clp,
new_deleg->ls_stateid), new_deleg, ls_hash);
LIST_INSERT_HEAD(&clp->lc_deleg, new_deleg, ls_list);
new_deleg = NULL;
newnfsstats.srvdelegates++;
nfsrv_openpluslock++;
nfsrv_delegatecnt++;
}
}
} else {
/*
* New owner case. Start the open_owner sequence with a
* Needs confirmation (unless a reclaim) and hang the
* new open off it.
*/
new_open->ls_stateid.seqid = 0;
new_open->ls_stateid.other[0] = clp->lc_clientid.lval[0];
new_open->ls_stateid.other[1] = clp->lc_clientid.lval[1];
new_open->ls_stateid.other[2] = nfsrv_nextstateindex(clp);
new_open->ls_flags = (new_stp->ls_flags & NFSLCK_SHAREBITS) |
NFSLCK_OPEN;
new_open->ls_uid = new_stp->ls_uid;
LIST_INIT(&new_open->ls_open);
new_open->ls_openowner = new_stp;
new_open->ls_lfp = lfp;
new_open->ls_clp = clp;
LIST_INSERT_HEAD(&lfp->lf_open, new_open, ls_file);
if (new_stp->ls_flags & NFSLCK_RECLAIM) {
new_stp->ls_flags = 0;
} else {
*rflagsp |= NFSV4OPEN_RESULTCONFIRM;
new_stp->ls_flags = NFSLCK_NEEDSCONFIRM;
}
nfsrvd_refcache(new_stp->ls_op);
new_stp->ls_noopens = 0;
LIST_INIT(&new_stp->ls_open);
LIST_INSERT_HEAD(&new_stp->ls_open, new_open, ls_list);
LIST_INSERT_HEAD(&clp->lc_open, new_stp, ls_list);
LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_open->ls_stateid),
new_open, ls_hash);
openstp = new_open;
new_open = NULL;
*new_stpp = NULL;
newnfsstats.srvopens++;
nfsrv_openpluslock++;
newnfsstats.srvopenowners++;
nfsrv_openpluslock++;
}
if (!error) {
stateidp->seqid = openstp->ls_stateid.seqid;
stateidp->other[0] = openstp->ls_stateid.other[0];
stateidp->other[1] = openstp->ls_stateid.other[1];
stateidp->other[2] = openstp->ls_stateid.other[2];
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
if (new_open)
FREE((caddr_t)new_open, M_NFSDSTATE);
if (new_deleg)
FREE((caddr_t)new_deleg, M_NFSDSTATE);
return (error);
}
/*
* Open update. Does the confirm, downgrade and close.
*/
APPLESTATIC int
nfsrv_openupdate(vnode_t vp, struct nfsstate *new_stp, nfsquad_t clientid,
nfsv4stateid_t *stateidp, struct nfsrv_descript *nd, NFSPROC_T *p)
{
struct nfsstate *stp, *ownerstp;
struct nfsclient *clp;
struct nfslockfile *lfp;
u_int32_t bits;
int error, gotstate = 0, len = 0;
u_char client[NFSV4_OPAQUELIMIT];
/*
* Check for restart conditions (client and server).
*/
error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
&new_stp->ls_stateid, 0);
if (error)
return (error);
NFSLOCKSTATE();
/*
* Get the open structure via clientid and stateid.
*/
error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp,
(nfsquad_t)((u_quad_t)0), NULL, p);
if (!error)
error = nfsrv_getstate(clp, &new_stp->ls_stateid,
new_stp->ls_flags, &stp);
/*
* Sanity check the open.
*/
if (!error && (!(stp->ls_flags & NFSLCK_OPEN) ||
(!(new_stp->ls_flags & NFSLCK_CONFIRM) &&
(stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM)) ||
((new_stp->ls_flags & NFSLCK_CONFIRM) &&
(!(stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM)))))
error = NFSERR_BADSTATEID;
if (!error)
error = nfsrv_checkseqid(nd, new_stp->ls_seq,
stp->ls_openowner, new_stp->ls_op);
if (!error && stp->ls_stateid.seqid != new_stp->ls_stateid.seqid &&
!(new_stp->ls_flags & NFSLCK_CONFIRM))
error = NFSERR_OLDSTATEID;
if (!error && vnode_vtype(vp) != VREG) {
if (vnode_vtype(vp) == VDIR)
error = NFSERR_ISDIR;
else
error = NFSERR_INVAL;
}
if (error) {
/*
* If a client tries to confirm an Open with a bad
* seqid# and there are no byte range locks or other Opens
* on the openowner, just throw it away, so the next use of the
* openowner will start a fresh seq#.
*/
if (error == NFSERR_BADSEQID &&
(new_stp->ls_flags & NFSLCK_CONFIRM) &&
nfsrv_nootherstate(stp))
nfsrv_freeopenowner(stp->ls_openowner, 0, p);
NFSUNLOCKSTATE();
return (error);
}
/*
* Set the return stateid.
*/
stateidp->seqid = stp->ls_stateid.seqid + 1;
stateidp->other[0] = stp->ls_stateid.other[0];
stateidp->other[1] = stp->ls_stateid.other[1];
stateidp->other[2] = stp->ls_stateid.other[2];
/*
* Now, handle the three cases.
*/
if (new_stp->ls_flags & NFSLCK_CONFIRM) {
/*
* If the open doesn't need confirmation, it seems to me that
* there is a client error, but I'll just log it and keep going?
*/
if (!(stp->ls_openowner->ls_flags & NFSLCK_NEEDSCONFIRM))
printf("Nfsv4d: stray open confirm\n");
stp->ls_openowner->ls_flags = 0;
stp->ls_stateid.seqid++;
if (!(clp->lc_flags & LCL_STAMPEDSTABLE)) {
clp->lc_flags |= LCL_STAMPEDSTABLE;
len = clp->lc_idlen;
NFSBCOPY(clp->lc_id, client, len);
gotstate = 1;
}
NFSUNLOCKSTATE();
} else if (new_stp->ls_flags & NFSLCK_CLOSE) {
ownerstp = stp->ls_openowner;
lfp = stp->ls_lfp;
if (nfsrv_dolocallocks != 0 && !LIST_EMPTY(&stp->ls_open)) {
/* Get the lf lock */
nfsrv_locklf(lfp);
NFSUNLOCKSTATE();
if (nfsrv_freeopen(stp, vp, 1, p) == 0) {
NFSLOCKSTATE();
nfsrv_unlocklf(lfp);
NFSUNLOCKSTATE();
}
} else {
(void) nfsrv_freeopen(stp, NULL, 0, p);
NFSUNLOCKSTATE();
}
} else {
/*
* Update the share bits, making sure that the new set are a
* subset of the old ones.
*/
bits = (new_stp->ls_flags & NFSLCK_SHAREBITS);
if (~(stp->ls_flags) & bits) {
NFSUNLOCKSTATE();
return (NFSERR_INVAL);
}
stp->ls_flags = (bits | NFSLCK_OPEN);
stp->ls_stateid.seqid++;
NFSUNLOCKSTATE();
}
/*
* If the client just confirmed its first open, write a timestamp
* to the stable storage file.
*/
if (gotstate)
nfsrv_writestable(client, len, NFSNST_NEWSTATE, p);
return (error);
}
/*
* Delegation update. Does the purge and return.
*/
APPLESTATIC int
nfsrv_delegupdate(nfsquad_t clientid, nfsv4stateid_t *stateidp,
vnode_t vp, int op, struct ucred *cred, NFSPROC_T *p)
{
struct nfsstate *stp;
struct nfsclient *clp;
int error;
fhandle_t fh;
/*
* Do a sanity check against the file handle for DelegReturn.
*/
if (vp) {
error = nfsvno_getfh(vp, &fh, p);
if (error)
return (error);
}
/*
* Check for restart conditions (client and server).
*/
if (op == NFSV4OP_DELEGRETURN)
error = nfsrv_checkrestart(clientid, NFSLCK_DELEGRETURN,
stateidp, 0);
else
error = nfsrv_checkrestart(clientid, NFSLCK_DELEGPURGE,
stateidp, 0);
NFSLOCKSTATE();
/*
* Get the open structure via clientid and stateid.
*/
if (!error)
error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp,
(nfsquad_t)((u_quad_t)0), NULL, p);
if (error) {
if (error == NFSERR_CBPATHDOWN)
error = 0;
if (error == NFSERR_STALECLIENTID && op == NFSV4OP_DELEGRETURN)
error = NFSERR_STALESTATEID;
}
if (!error && op == NFSV4OP_DELEGRETURN) {
error = nfsrv_getstate(clp, stateidp, NFSLCK_DELEGRETURN, &stp);
if (!error && stp->ls_stateid.seqid != stateidp->seqid)
error = NFSERR_OLDSTATEID;
}
/*
* NFSERR_EXPIRED means that the state has gone away,
* so Delegations have been purged. Just return ok.
*/
if (error == NFSERR_EXPIRED && op == NFSV4OP_DELEGPURGE) {
NFSUNLOCKSTATE();
return (0);
}
if (error) {
NFSUNLOCKSTATE();
return (error);
}
if (op == NFSV4OP_DELEGRETURN) {
if (NFSBCMP((caddr_t)&fh, (caddr_t)&stp->ls_lfp->lf_fh,
sizeof (fhandle_t))) {
NFSUNLOCKSTATE();
return (NFSERR_BADSTATEID);
}
nfsrv_freedeleg(stp);
} else {
nfsrv_freedeleglist(&clp->lc_olddeleg);
}
NFSUNLOCKSTATE();
return (0);
}
/*
* Release lock owner.
*/
APPLESTATIC int
nfsrv_releaselckown(struct nfsstate *new_stp, nfsquad_t clientid,
NFSPROC_T *p)
{
struct nfsstate *stp, *nstp, *openstp, *ownstp;
struct nfsclient *clp;
int error;
/*
* Check for restart conditions (client and server).
*/
error = nfsrv_checkrestart(clientid, new_stp->ls_flags,
&new_stp->ls_stateid, 0);
if (error)
return (error);
NFSLOCKSTATE();
/*
* Get the lock owner by name.
*/
error = nfsrv_getclient(clientid, CLOPS_RENEW, &clp,
(nfsquad_t)((u_quad_t)0), NULL, p);
if (error) {
NFSUNLOCKSTATE();
return (error);
}
LIST_FOREACH(ownstp, &clp->lc_open, ls_list) {
LIST_FOREACH(openstp, &ownstp->ls_open, ls_list) {
stp = LIST_FIRST(&openstp->ls_open);
while (stp != LIST_END(&openstp->ls_open)) {
nstp = LIST_NEXT(stp, ls_list);
/*
* If the owner matches, check for locks and
* then free or return an error.
*/
if (stp->ls_ownerlen == new_stp->ls_ownerlen &&
!NFSBCMP(stp->ls_owner, new_stp->ls_owner,
stp->ls_ownerlen)){
if (LIST_EMPTY(&stp->ls_lock)) {
nfsrv_freelockowner(stp, NULL, 0, p);
} else {
NFSUNLOCKSTATE();
return (NFSERR_LOCKSHELD);
}
}
stp = nstp;
}
}
}
NFSUNLOCKSTATE();
return (0);
}
/*
* Get the file handle for a lock structure.
*/
static int
nfsrv_getlockfh(vnode_t vp, u_short flags,
struct nfslockfile **new_lfpp, fhandle_t *nfhp, NFSPROC_T *p)
{
fhandle_t *fhp = NULL;
struct nfslockfile *new_lfp;
int error;
/*
* For lock, use the new nfslock structure, otherwise just
* a fhandle_t on the stack.
*/
if (flags & NFSLCK_OPEN) {
new_lfp = *new_lfpp;
fhp = &new_lfp->lf_fh;
} else if (nfhp) {
fhp = nfhp;
} else {
panic("nfsrv_getlockfh");
}
error = nfsvno_getfh(vp, fhp, p);
return (error);
}
/*
* Get an nfs lock structure. Allocate one, as required, and return a
* pointer to it.
* Returns an NFSERR_xxx upon failure or -1 to indicate no current lock.
*/
static int
nfsrv_getlockfile(u_short flags, struct nfslockfile **new_lfpp,
struct nfslockfile **lfpp, fhandle_t *nfhp, int lockit)
{
struct nfslockfile *lfp;
fhandle_t *fhp = NULL, *tfhp;
struct nfslockhashhead *hp;
struct nfslockfile *new_lfp = NULL;
/*
* For lock, use the new nfslock structure, otherwise just
* a fhandle_t on the stack.
*/
if (flags & NFSLCK_OPEN) {
new_lfp = *new_lfpp;
fhp = &new_lfp->lf_fh;
} else if (nfhp) {
fhp = nfhp;
} else {
panic("nfsrv_getlockfile");
}
hp = NFSLOCKHASH(fhp);
LIST_FOREACH(lfp, hp, lf_hash) {
tfhp = &lfp->lf_fh;
if (NFSVNO_CMPFH(fhp, tfhp)) {
if (lockit)
nfsrv_locklf(lfp);
*lfpp = lfp;
return (0);
}
}
if (!(flags & NFSLCK_OPEN))
return (-1);
/*
* No match, so chain the new one into the list.
*/
LIST_INIT(&new_lfp->lf_open);
LIST_INIT(&new_lfp->lf_lock);
LIST_INIT(&new_lfp->lf_deleg);
LIST_INIT(&new_lfp->lf_locallock);
LIST_INIT(&new_lfp->lf_rollback);
new_lfp->lf_locallock_lck.nfslock_usecnt = 0;
new_lfp->lf_locallock_lck.nfslock_lock = 0;
new_lfp->lf_usecount = 0;
LIST_INSERT_HEAD(hp, new_lfp, lf_hash);
*lfpp = new_lfp;
*new_lfpp = NULL;
return (0);
}
/*
* This function adds a nfslock lock structure to the list for the associated
* nfsstate and nfslockfile structures. It will be inserted after the
* entry pointed at by insert_lop.
*/
static void
nfsrv_insertlock(struct nfslock *new_lop, struct nfslock *insert_lop,
struct nfsstate *stp, struct nfslockfile *lfp)
{
struct nfslock *lop, *nlop;
new_lop->lo_stp = stp;
new_lop->lo_lfp = lfp;
if (stp != NULL) {
/* Insert in increasing lo_first order */
lop = LIST_FIRST(&lfp->lf_lock);
if (lop == LIST_END(&lfp->lf_lock) ||
new_lop->lo_first <= lop->lo_first) {
LIST_INSERT_HEAD(&lfp->lf_lock, new_lop, lo_lckfile);
} else {
nlop = LIST_NEXT(lop, lo_lckfile);
while (nlop != LIST_END(&lfp->lf_lock) &&
nlop->lo_first < new_lop->lo_first) {
lop = nlop;
nlop = LIST_NEXT(lop, lo_lckfile);
}
LIST_INSERT_AFTER(lop, new_lop, lo_lckfile);
}
} else {
new_lop->lo_lckfile.le_prev = NULL; /* list not used */
}
/*
* Insert after insert_lop, which is overloaded as stp or lfp for
* an empty list.
*/
if (stp == NULL && (struct nfslockfile *)insert_lop == lfp)
LIST_INSERT_HEAD(&lfp->lf_locallock, new_lop, lo_lckowner);
else if ((struct nfsstate *)insert_lop == stp)
LIST_INSERT_HEAD(&stp->ls_lock, new_lop, lo_lckowner);
else
LIST_INSERT_AFTER(insert_lop, new_lop, lo_lckowner);
if (stp != NULL) {
newnfsstats.srvlocks++;
nfsrv_openpluslock++;
}
}
/*
* This function updates the locking for a lock owner and given file. It
* maintains a list of lock ranges ordered on increasing file offset that
* are NFSLCK_READ or NFSLCK_WRITE and non-overlapping (aka POSIX style).
* It always adds new_lop to the list and sometimes uses the one pointed
* at by other_lopp.
*/
static void
nfsrv_updatelock(struct nfsstate *stp, struct nfslock **new_lopp,
struct nfslock **other_lopp, struct nfslockfile *lfp)
{
struct nfslock *new_lop = *new_lopp;
struct nfslock *lop, *tlop, *ilop;
struct nfslock *other_lop = *other_lopp;
int unlock = 0, myfile = 0;
u_int64_t tmp;
/*
* Work down the list until the lock is merged.
*/
if (new_lop->lo_flags & NFSLCK_UNLOCK)
unlock = 1;
if (stp != NULL) {
ilop = (struct nfslock *)stp;
lop = LIST_FIRST(&stp->ls_lock);
} else {
ilop = (struct nfslock *)lfp;
lop = LIST_FIRST(&lfp->lf_locallock);
}
while (lop != NULL) {
/*
* Only check locks for this file that aren't before the start of
* new lock's range.
*/
if (lop->lo_lfp == lfp) {
myfile = 1;
if (lop->lo_end >= new_lop->lo_first) {
if (new_lop->lo_end < lop->lo_first) {
/*
* If the new lock ends before the start of the
* current lock's range, no merge, just insert
* the new lock.
*/
break;
}
if (new_lop->lo_flags == lop->lo_flags ||
(new_lop->lo_first <= lop->lo_first &&
new_lop->lo_end >= lop->lo_end)) {
/*
* This lock can be absorbed by the new lock/unlock.
* This happens when it covers the entire range
* of the old lock or is contiguous
* with the old lock and is of the same type or an
* unlock.
*/
if (lop->lo_first < new_lop->lo_first)
new_lop->lo_first = lop->lo_first;
if (lop->lo_end > new_lop->lo_end)
new_lop->lo_end = lop->lo_end;
tlop = lop;
lop = LIST_NEXT(lop, lo_lckowner);
nfsrv_freenfslock(tlop);
continue;
}
/*
* All these cases are for contiguous locks that are not the
* same type, so they can't be merged.
*/
if (new_lop->lo_first <= lop->lo_first) {
/*
* This case is where the new lock overlaps with the
* first part of the old lock. Move the start of the
* old lock to just past the end of the new lock. The
* new lock will be inserted in front of the old, since
* ilop hasn't been updated. (We are done now.)
*/
lop->lo_first = new_lop->lo_end;
break;
}
if (new_lop->lo_end >= lop->lo_end) {
/*
* This case is where the new lock overlaps with the
* end of the old lock's range. Move the old lock's
* end to just before the new lock's first and insert
* the new lock after the old lock.
* Might not be done yet, since the new lock could
* overlap further locks with higher ranges.
*/
lop->lo_end = new_lop->lo_first;
ilop = lop;
lop = LIST_NEXT(lop, lo_lckowner);
continue;
}
/*
* The final case is where the new lock's range is in the
* middle of the current lock's and splits the current lock
* up. Use *other_lopp to handle the second part of the
* split old lock range. (We are done now.)
* For unlock, we use new_lop as other_lop and tmp, since
* other_lop and new_lop are the same for this case.
* We noted the unlock case above, so we don't need
* new_lop->lo_flags any longer.
*/
tmp = new_lop->lo_first;
if (other_lop == NULL) {
if (!unlock)
panic("nfsd srv update unlock");
other_lop = new_lop;
*new_lopp = NULL;
}
other_lop->lo_first = new_lop->lo_end;
other_lop->lo_end = lop->lo_end;
other_lop->lo_flags = lop->lo_flags;
other_lop->lo_stp = stp;
other_lop->lo_lfp = lfp;
lop->lo_end = tmp;
nfsrv_insertlock(other_lop, lop, stp, lfp);
*other_lopp = NULL;
ilop = lop;
break;
}
}
ilop = lop;
lop = LIST_NEXT(lop, lo_lckowner);
if (myfile && (lop == NULL || lop->lo_lfp != lfp))
break;
}
/*
* Insert the new lock in the list at the appropriate place.
*/
if (!unlock) {
nfsrv_insertlock(new_lop, ilop, stp, lfp);
*new_lopp = NULL;
}
}
/*
* This function handles sequencing of locks, etc.
* It returns an error that indicates what the caller should do.
*/
static int
nfsrv_checkseqid(struct nfsrv_descript *nd, u_int32_t seqid,
struct nfsstate *stp, struct nfsrvcache *op)
{
if (op != nd->nd_rp)
panic("nfsrvstate checkseqid");
if (!(op->rc_flag & RC_INPROG))
panic("nfsrvstate not inprog");
if (stp->ls_op && stp->ls_op->rc_refcnt <= 0) {
printf("refcnt=%d\n", stp->ls_op->rc_refcnt);
panic("nfsrvstate op refcnt");
}
if ((stp->ls_seq + 1) == seqid) {
if (stp->ls_op)
nfsrvd_derefcache(stp->ls_op);
stp->ls_op = op;
nfsrvd_refcache(op);
stp->ls_seq = seqid;
return (0);
} else if (stp->ls_seq == seqid && stp->ls_op &&
op->rc_xid == stp->ls_op->rc_xid &&
op->rc_refcnt == 0 &&
op->rc_reqlen == stp->ls_op->rc_reqlen &&
op->rc_cksum == stp->ls_op->rc_cksum) {
if (stp->ls_op->rc_flag & RC_INPROG)
return (NFSERR_DONTREPLY);
nd->nd_rp = stp->ls_op;
nd->nd_rp->rc_flag |= RC_INPROG;
nfsrvd_delcache(op);
return (NFSERR_REPLYFROMCACHE);
}
return (NFSERR_BADSEQID);
}
/*
* Get the client ip address for callbacks. If the strings can't be parsed,
* just set lc_program to 0 to indicate no callbacks are possible.
* (For cases where the address can't be parsed or is 0.0.0.0.0.0, set
* the address to the client's transport address. This won't be used
* for callbacks, but can be printed out by newnfsstats for info.)
* Return error if the xdr can't be parsed, 0 otherwise.
*/
APPLESTATIC int
nfsrv_getclientipaddr(struct nfsrv_descript *nd, struct nfsclient *clp)
{
u_int32_t *tl;
u_char *cp, *cp2;
int i, j;
struct sockaddr_in *rad, *sad;
u_char protocol[5], addr[24];
int error = 0, cantparse = 0;
union {
u_long ival;
u_char cval[4];
} ip;
union {
u_short sval;
u_char cval[2];
} port;
rad = NFSSOCKADDR(clp->lc_req.nr_nam, struct sockaddr_in *);
rad->sin_family = AF_INET;
rad->sin_len = sizeof (struct sockaddr_in);
rad->sin_addr.s_addr = 0;
rad->sin_port = 0;
clp->lc_req.nr_client = NULL;
clp->lc_req.nr_lock = 0;
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
if (i >= 3 && i <= 4) {
error = nfsrv_mtostr(nd, protocol, i);
if (error)
goto nfsmout;
if (!strcmp(protocol, "tcp")) {
clp->lc_flags |= LCL_TCPCALLBACK;
clp->lc_req.nr_sotype = SOCK_STREAM;
clp->lc_req.nr_soproto = IPPROTO_TCP;
} else if (!strcmp(protocol, "udp")) {
clp->lc_req.nr_sotype = SOCK_DGRAM;
clp->lc_req.nr_soproto = IPPROTO_UDP;
} else {
cantparse = 1;
}
} else {
cantparse = 1;
if (i > 0) {
error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
if (error)
goto nfsmout;
}
}
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
i = fxdr_unsigned(int, *tl);
if (i < 0) {
error = NFSERR_BADXDR;
goto nfsmout;
} else if (i == 0) {
cantparse = 1;
} else if (!cantparse && i <= 23 && i >= 11) {
error = nfsrv_mtostr(nd, addr, i);
if (error)
goto nfsmout;
/*
* Parse out the address fields. We expect 6 decimal numbers
* separated by '.'s.
*/
cp = addr;
i = 0;
while (*cp && i < 6) {
cp2 = cp;
while (*cp2 && *cp2 != '.')
cp2++;
if (*cp2)
*cp2++ = '\0';
else if (i != 5) {
cantparse = 1;
break;
}
j = nfsrv_getipnumber(cp);
if (j >= 0) {
if (i < 4)
ip.cval[3 - i] = j;
else
port.cval[5 - i] = j;
} else {
cantparse = 1;
break;
}
cp = cp2;
i++;
}
if (!cantparse) {
if (ip.ival != 0x0) {
rad->sin_addr.s_addr = htonl(ip.ival);
rad->sin_port = htons(port.sval);
} else {
cantparse = 1;
}
}
} else {
cantparse = 1;
if (i > 0) {
error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
if (error)
goto nfsmout;
}
}
if (cantparse) {
sad = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
rad->sin_addr.s_addr = sad->sin_addr.s_addr;
rad->sin_port = 0x0;
clp->lc_program = 0;
}
nfsmout:
return (error);
}
/*
* Turn a string of up to three decimal digits into a number. Return -1 upon
* error.
*/
static int
nfsrv_getipnumber(u_char *cp)
{
int i = 0, j = 0;
while (*cp) {
if (j > 2 || *cp < '0' || *cp > '9')
return (-1);
i *= 10;
i += (*cp - '0');
cp++;
j++;
}
if (i < 256)
return (i);
return (-1);
}
/*
* This function checks for restart conditions.
*/
static int
nfsrv_checkrestart(nfsquad_t clientid, u_int32_t flags,
nfsv4stateid_t *stateidp, int specialid)
{
int ret;
/*
* First check for a server restart. Open, LockT, ReleaseLockOwner
* and DelegPurge have a clientid, the rest a stateid.
*/
if (flags &
(NFSLCK_OPEN | NFSLCK_TEST | NFSLCK_RELEASE | NFSLCK_DELEGPURGE)) {
if (clientid.lval[0] != nfsrvboottime)
return (NFSERR_STALECLIENTID);
} else if (stateidp->other[0] != nfsrvboottime &&
specialid == 0)
return (NFSERR_STALESTATEID);
/*
* Read, Write, Setattr and LockT can return NFSERR_GRACE and do
* not use a lock/open owner seqid#, so the check can be done now.
* (The others will be checked, as required, later.)
*/
if (!(flags & (NFSLCK_CHECK | NFSLCK_TEST)))
return (0);
NFSLOCKSTATE();
ret = nfsrv_checkgrace(flags);
NFSUNLOCKSTATE();
return (ret);
}
/*
* Check for grace.
*/
static int
nfsrv_checkgrace(u_int32_t flags)
{
if (nfsrv_stablefirst.nsf_flags & NFSNSF_GRACEOVER) {
if (flags & NFSLCK_RECLAIM)
return (NFSERR_NOGRACE);
} else {
if (!(flags & NFSLCK_RECLAIM))
return (NFSERR_GRACE);
/*
* If grace is almost over and we are still getting Reclaims,
* extend grace a bit.
*/
if ((NFSD_MONOSEC + NFSRV_LEASEDELTA) >
nfsrv_stablefirst.nsf_eograce)
nfsrv_stablefirst.nsf_eograce = NFSD_MONOSEC +
NFSRV_LEASEDELTA;
}
return (0);
}
/*
* Do a server callback.
*/
static int
nfsrv_docallback(struct nfsclient *clp, int procnum,
nfsv4stateid_t *stateidp, int trunc, fhandle_t *fhp,
struct nfsvattr *nap, nfsattrbit_t *attrbitp, NFSPROC_T *p)
{
mbuf_t m;
u_int32_t *tl;
struct nfsrv_descript nfsd, *nd = &nfsd;
struct ucred *cred;
int error = 0;
u_int32_t callback;
cred = newnfs_getcred();
NFSLOCKSTATE(); /* mostly for lc_cbref++ */
if (clp->lc_flags & LCL_NEEDSCONFIRM) {
NFSUNLOCKSTATE();
panic("docallb");
}
clp->lc_cbref++;
/*
* Fill the callback program# and version into the request
* structure for newnfs_connect() to use.
*/
clp->lc_req.nr_prog = clp->lc_program;
clp->lc_req.nr_vers = NFSV4_CBVERS;
/*
* First, fill in some of the fields of nd and cr.
*/
nd->nd_flag = ND_NFSV4;
if (clp->lc_flags & LCL_GSS)
nd->nd_flag |= ND_KERBV;
nd->nd_repstat = 0;
cred->cr_uid = clp->lc_uid;
cred->cr_gid = clp->lc_gid;
callback = clp->lc_callback;
NFSUNLOCKSTATE();
cred->cr_ngroups = 1;
/*
* Get the first mbuf for the request.
*/
MGET(m, M_WAIT, MT_DATA);
mbuf_setlen(m, 0);
nd->nd_mreq = nd->nd_mb = m;
nd->nd_bpos = NFSMTOD(m, caddr_t);
/*
* and build the callback request.
*/
if (procnum == NFSV4OP_CBGETATTR) {
nd->nd_procnum = NFSV4PROC_CBCOMPOUND;
(void) nfsm_strtom(nd, "CB Getattr", 10);
NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
*tl++ = txdr_unsigned(NFSV4_MINORVERSION);
*tl++ = txdr_unsigned(callback);
*tl++ = txdr_unsigned(1);
*tl = txdr_unsigned(NFSV4OP_CBGETATTR);
(void) nfsm_fhtom(nd, (u_int8_t *)fhp, NFSX_MYFH, 0);
(void) nfsrv_putattrbit(nd, attrbitp);
} else if (procnum == NFSV4OP_CBRECALL) {
nd->nd_procnum = NFSV4PROC_CBCOMPOUND;
(void) nfsm_strtom(nd, "CB Recall", 9);
NFSM_BUILD(tl, u_int32_t *, 5 * NFSX_UNSIGNED + NFSX_STATEID);
*tl++ = txdr_unsigned(NFSV4_MINORVERSION);
*tl++ = txdr_unsigned(callback);
*tl++ = txdr_unsigned(1);
*tl++ = txdr_unsigned(NFSV4OP_CBRECALL);
*tl++ = txdr_unsigned(stateidp->seqid);
NFSBCOPY((caddr_t)stateidp->other, (caddr_t)tl,
NFSX_STATEIDOTHER);
tl += (NFSX_STATEIDOTHER / NFSX_UNSIGNED);
if (trunc)
*tl = newnfs_true;
else
*tl = newnfs_false;
(void) nfsm_fhtom(nd, (u_int8_t *)fhp, NFSX_MYFH, 0);
} else {
nd->nd_procnum = NFSV4PROC_CBNULL;
}
/*
* Call newnfs_connect(), as required, and then newnfs_request().
*/
(void) newnfs_sndlock(&clp->lc_req.nr_lock);
if (clp->lc_req.nr_client == NULL) {
if (nd->nd_procnum == NFSV4PROC_CBNULL)
error = newnfs_connect(NULL, &clp->lc_req, cred,
NULL, 1);
else
error = newnfs_connect(NULL, &clp->lc_req, cred,
NULL, 3);
}
newnfs_sndunlock(&clp->lc_req.nr_lock);
if (!error) {
error = newnfs_request(nd, NULL, clp, &clp->lc_req, NULL,
NULL, cred, clp->lc_program, NFSV4_CBVERS, NULL, 1, NULL);
}
NFSFREECRED(cred);
/*
* If error is set here, the Callback path isn't working
* properly, so twiddle the appropriate LCL_ flags.
* (nd_repstat != 0 indicates the Callback path is working,
* but the callback failed on the client.)
*/
if (error) {
/*
* Mark the callback pathway down, which disabled issuing
* of delegations and gets Renew to return NFSERR_CBPATHDOWN.
*/
NFSLOCKSTATE();
clp->lc_flags |= LCL_CBDOWN;
NFSUNLOCKSTATE();
} else {
/*
* Callback worked. If the callback path was down, disable
* callbacks, so no more delegations will be issued. (This
* is done on the assumption that the callback pathway is
* flakey.)
*/
NFSLOCKSTATE();
if (clp->lc_flags & LCL_CBDOWN)
clp->lc_flags &= ~(LCL_CBDOWN | LCL_CALLBACKSON);
NFSUNLOCKSTATE();
if (nd->nd_repstat)
error = nd->nd_repstat;
else if (procnum == NFSV4OP_CBGETATTR)
error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0,
NULL, NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL,
p, NULL);
mbuf_freem(nd->nd_mrep);
}
NFSLOCKSTATE();
clp->lc_cbref--;
if ((clp->lc_flags & LCL_WAKEUPWANTED) && clp->lc_cbref == 0) {
clp->lc_flags &= ~LCL_WAKEUPWANTED;
NFSUNLOCKSTATE();
wakeup((caddr_t)clp);
} else {
NFSUNLOCKSTATE();
}
return (error);
}
/*
* Return the next index# for a clientid. Mostly just increment and return
* the next one, but... if the 32bit unsigned does actually wrap around,
* it should be rebooted.
* At an average rate of one new client per second, it will wrap around in
* approximately 136 years. (I think the server will have been shut
* down or rebooted before then.)
*/
static u_int32_t
nfsrv_nextclientindex(void)
{
static u_int32_t client_index = 0;
client_index++;
if (client_index != 0)
return (client_index);
printf("%s: out of clientids\n", __func__);
return (client_index);
}
/*
* Return the next index# for a stateid. Mostly just increment and return
* the next one, but... if the 32bit unsigned does actually wrap around
* (will a BSD server stay up that long?), find
* new start and end values.
*/
static u_int32_t
nfsrv_nextstateindex(struct nfsclient *clp)
{
struct nfsstate *stp;
int i;
u_int32_t canuse, min_index, max_index;
if (!(clp->lc_flags & LCL_INDEXNOTOK)) {
clp->lc_stateindex++;
if (clp->lc_stateindex != clp->lc_statemaxindex)
return (clp->lc_stateindex);
}
/*
* Yuck, we've hit the end.
* Look for a new min and max.
*/
min_index = 0;
max_index = 0xffffffff;
for (i = 0; i < NFSSTATEHASHSIZE; i++) {
LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
if (stp->ls_stateid.other[2] > 0x80000000) {
if (stp->ls_stateid.other[2] < max_index)
max_index = stp->ls_stateid.other[2];
} else {
if (stp->ls_stateid.other[2] > min_index)
min_index = stp->ls_stateid.other[2];
}
}
}
/*
* Yikes, highly unlikely, but I'll handle it anyhow.
*/
if (min_index == 0x80000000 && max_index == 0x80000001) {
canuse = 0;
/*
* Loop around until we find an unused entry. Return that
* and set LCL_INDEXNOTOK, so the search will continue next time.
* (This is one of those rare cases where a goto is the
* cleanest way to code the loop.)
*/
tryagain:
for (i = 0; i < NFSSTATEHASHSIZE; i++) {
LIST_FOREACH(stp, &clp->lc_stateid[i], ls_hash) {
if (stp->ls_stateid.other[2] == canuse) {
canuse++;
goto tryagain;
}
}
}
clp->lc_flags |= LCL_INDEXNOTOK;
return (canuse);
}
/*
* Ok to start again from min + 1.
*/
clp->lc_stateindex = min_index + 1;
clp->lc_statemaxindex = max_index;
clp->lc_flags &= ~LCL_INDEXNOTOK;
return (clp->lc_stateindex);
}
/*
* The following functions handle the stable storage file that deals with
* the edge conditions described in RFC3530 Sec. 8.6.3.
* The file is as follows:
* - a single record at the beginning that has the lease time of the
* previous server instance (before the last reboot) and the nfsrvboottime
* values for the previous server boots.
* These previous boot times are used to ensure that the current
* nfsrvboottime does not, somehow, get set to a previous one.
* (This is important so that Stale ClientIDs and StateIDs can
* be recognized.)
* The number of previous nfsvrboottime values preceeds the list.
* - followed by some number of appended records with:
* - client id string
* - flag that indicates it is a record revoking state via lease
* expiration or similar
* OR has successfully acquired state.
* These structures vary in length, with the client string at the end, up
* to NFSV4_OPAQUELIMIT in size.
*
* At the end of the grace period, the file is truncated, the first
* record is rewritten with updated information and any acquired state
* records for successful reclaims of state are written.
*
* Subsequent records are appended when the first state is issued to
* a client and when state is revoked for a client.
*
* When reading the file in, state issued records that come later in
* the file override older ones, since the append log is in cronological order.
* If, for some reason, the file can't be read, the grace period is
* immediately terminated and all reclaims get NFSERR_NOGRACE.
*/
/*
* Read in the stable storage file. Called by nfssvc() before the nfsd
* processes start servicing requests.
*/
APPLESTATIC void
nfsrv_setupstable(NFSPROC_T *p)
{
struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
struct nfsrv_stable *sp, *nsp;
struct nfst_rec *tsp;
int error, i, tryagain;
off_t off = 0;
int aresid, len;
struct timeval curtime;
/*
* If NFSNSF_UPDATEDONE is set, this is a restart of the nfsds without
* a reboot, so state has not been lost.
*/
if (sf->nsf_flags & NFSNSF_UPDATEDONE)
return;
/*
* Set Grace over just until the file reads successfully.
*/
NFSGETTIME(&curtime);
nfsrvboottime = curtime.tv_sec;
LIST_INIT(&sf->nsf_head);
sf->nsf_flags = (NFSNSF_GRACEOVER | NFSNSF_NEEDLOCK);
sf->nsf_eograce = NFSD_MONOSEC + NFSRV_LEASEDELTA;
if (sf->nsf_fp == NULL)
return;
error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
(caddr_t)&sf->nsf_rec, sizeof (struct nfsf_rec), off, UIO_SYSSPACE,
0, NFSFPCRED(sf->nsf_fp), &aresid, p);
if (error || aresid || sf->nsf_numboots == 0 ||
sf->nsf_numboots > NFSNSF_MAXNUMBOOTS)
return;
/*
* Now, read in the boottimes.
*/
sf->nsf_bootvals = (time_t *)malloc((sf->nsf_numboots + 1) *
sizeof (time_t), M_TEMP, M_WAITOK);
off = sizeof (struct nfsf_rec);
error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
(caddr_t)sf->nsf_bootvals, sf->nsf_numboots * sizeof (time_t), off,
UIO_SYSSPACE, 0, NFSFPCRED(sf->nsf_fp), &aresid, p);
if (error || aresid) {
free((caddr_t)sf->nsf_bootvals, M_TEMP);
sf->nsf_bootvals = NULL;
return;
}
/*
* Make sure this nfsrvboottime is different from all recorded
* previous ones.
*/
do {
tryagain = 0;
for (i = 0; i < sf->nsf_numboots; i++) {
if (nfsrvboottime == sf->nsf_bootvals[i]) {
nfsrvboottime++;
tryagain = 1;
break;
}
}
} while (tryagain);
sf->nsf_flags |= NFSNSF_OK;
off += (sf->nsf_numboots * sizeof (time_t));
/*
* Read through the file, building a list of records for grace
* checking.
* Each record is between sizeof (struct nfst_rec) and
* sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1
* and is actually sizeof (struct nfst_rec) + nst_len - 1.
*/
tsp = (struct nfst_rec *)malloc(sizeof (struct nfst_rec) +
NFSV4_OPAQUELIMIT - 1, M_TEMP, M_WAITOK);
do {
error = NFSD_RDWR(UIO_READ, NFSFPVNODE(sf->nsf_fp),
(caddr_t)tsp, sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1,
off, UIO_SYSSPACE, 0, NFSFPCRED(sf->nsf_fp), &aresid, p);
len = (sizeof (struct nfst_rec) + NFSV4_OPAQUELIMIT - 1) - aresid;
if (error || (len > 0 && (len < sizeof (struct nfst_rec) ||
len < (sizeof (struct nfst_rec) + tsp->len - 1)))) {
/*
* Yuck, the file has been corrupted, so just return
* after clearing out any restart state, so the grace period
* is over.
*/
LIST_FOREACH_SAFE(sp, &sf->nsf_head, nst_list, nsp) {
LIST_REMOVE(sp, nst_list);
free((caddr_t)sp, M_TEMP);
}
free((caddr_t)tsp, M_TEMP);
sf->nsf_flags &= ~NFSNSF_OK;
free((caddr_t)sf->nsf_bootvals, M_TEMP);
sf->nsf_bootvals = NULL;
return;
}
if (len > 0) {
off += sizeof (struct nfst_rec) + tsp->len - 1;
/*
* Search the list for a matching client.
*/
LIST_FOREACH(sp, &sf->nsf_head, nst_list) {
if (tsp->len == sp->nst_len &&
!NFSBCMP(tsp->client, sp->nst_client, tsp->len))
break;
}
if (sp == LIST_END(&sf->nsf_head)) {
sp = (struct nfsrv_stable *)malloc(tsp->len +
sizeof (struct nfsrv_stable) - 1, M_TEMP,
M_WAITOK);
NFSBCOPY((caddr_t)tsp, (caddr_t)&sp->nst_rec,
sizeof (struct nfst_rec) + tsp->len - 1);
LIST_INSERT_HEAD(&sf->nsf_head, sp, nst_list);
} else {
if (tsp->flag == NFSNST_REVOKE)
sp->nst_flag |= NFSNST_REVOKE;
else
/*
* A subsequent timestamp indicates the client
* did a setclientid/confirm and any previous
* revoke is no longer relevant.
*/
sp->nst_flag &= ~NFSNST_REVOKE;
}
}
} while (len > 0);
free((caddr_t)tsp, M_TEMP);
sf->nsf_flags = NFSNSF_OK;
sf->nsf_eograce = NFSD_MONOSEC + sf->nsf_lease +
NFSRV_LEASEDELTA;
}
/*
* Update the stable storage file, now that the grace period is over.
*/
APPLESTATIC void
nfsrv_updatestable(NFSPROC_T *p)
{
struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
struct nfsrv_stable *sp, *nsp;
int i;
struct nfsvattr nva;
vnode_t vp;
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 500000)
mount_t mp = NULL;
#endif
int error;
if (sf->nsf_fp == NULL || (sf->nsf_flags & NFSNSF_UPDATEDONE))
return;
sf->nsf_flags |= NFSNSF_UPDATEDONE;
/*
* Ok, we need to rewrite the stable storage file.
* - truncate to 0 length
* - write the new first structure
* - loop through the data structures, writing out any that
* have timestamps older than the old boot
*/
if (sf->nsf_bootvals) {
sf->nsf_numboots++;
for (i = sf->nsf_numboots - 2; i >= 0; i--)
sf->nsf_bootvals[i + 1] = sf->nsf_bootvals[i];
} else {
sf->nsf_numboots = 1;
sf->nsf_bootvals = (time_t *)malloc(sizeof (time_t),
M_TEMP, M_WAITOK);
}
sf->nsf_bootvals[0] = nfsrvboottime;
sf->nsf_lease = nfsrv_lease;
NFSVNO_ATTRINIT(&nva);
NFSVNO_SETATTRVAL(&nva, size, 0);
vp = NFSFPVNODE(sf->nsf_fp);
NFS_STARTWRITE(vp, &mp);
NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
error = nfsvno_setattr(vp, &nva, NFSFPCRED(sf->nsf_fp), p, NULL);
NFS_ENDWRITE(mp);
NFSVOPUNLOCK(vp, 0, p);
if (!error)
error = NFSD_RDWR(UIO_WRITE, vp,
(caddr_t)&sf->nsf_rec, sizeof (struct nfsf_rec), (off_t)0,
UIO_SYSSPACE, IO_SYNC, NFSFPCRED(sf->nsf_fp), NULL, p);
if (!error)
error = NFSD_RDWR(UIO_WRITE, vp,
(caddr_t)sf->nsf_bootvals,
sf->nsf_numboots * sizeof (time_t),
(off_t)(sizeof (struct nfsf_rec)),
UIO_SYSSPACE, IO_SYNC, NFSFPCRED(sf->nsf_fp), NULL, p);
free((caddr_t)sf->nsf_bootvals, M_TEMP);
sf->nsf_bootvals = NULL;
if (error) {
sf->nsf_flags &= ~NFSNSF_OK;
printf("EEK! Can't write NfsV4 stable storage file\n");
return;
}
sf->nsf_flags |= NFSNSF_OK;
/*
* Loop through the list and write out timestamp records for
* any clients that successfully reclaimed state.
*/
LIST_FOREACH_SAFE(sp, &sf->nsf_head, nst_list, nsp) {
if (sp->nst_flag & NFSNST_GOTSTATE) {
nfsrv_writestable(sp->nst_client, sp->nst_len,
NFSNST_NEWSTATE, p);
sp->nst_clp->lc_flags |= LCL_STAMPEDSTABLE;
}
LIST_REMOVE(sp, nst_list);
free((caddr_t)sp, M_TEMP);
}
}
/*
* Append a record to the stable storage file.
*/
APPLESTATIC void
nfsrv_writestable(u_char *client, int len, int flag, NFSPROC_T *p)
{
struct nfsrv_stablefirst *sf = &nfsrv_stablefirst;
struct nfst_rec *sp;
int error;
if (!(sf->nsf_flags & NFSNSF_OK) || sf->nsf_fp == NULL)
return;
sp = (struct nfst_rec *)malloc(sizeof (struct nfst_rec) +
len - 1, M_TEMP, M_WAITOK);
sp->len = len;
NFSBCOPY(client, sp->client, len);
sp->flag = flag;
error = NFSD_RDWR(UIO_WRITE, NFSFPVNODE(sf->nsf_fp),
(caddr_t)sp, sizeof (struct nfst_rec) + len - 1, (off_t)0,
UIO_SYSSPACE, (IO_SYNC | IO_APPEND), NFSFPCRED(sf->nsf_fp), NULL, p);
free((caddr_t)sp, M_TEMP);
if (error) {
sf->nsf_flags &= ~NFSNSF_OK;
printf("EEK! Can't write NfsV4 stable storage file\n");
}
}
/*
* This function is called during the grace period to mark a client
* that successfully reclaimed state.
*/
static void
nfsrv_markstable(struct nfsclient *clp)
{
struct nfsrv_stable *sp;
/*
* First find the client structure.
*/
LIST_FOREACH(sp, &nfsrv_stablefirst.nsf_head, nst_list) {
if (sp->nst_len == clp->lc_idlen &&
!NFSBCMP(sp->nst_client, clp->lc_id, sp->nst_len))
break;
}
if (sp == LIST_END(&nfsrv_stablefirst.nsf_head))
return;
/*
* Now, just mark it and set the nfsclient back pointer.
*/
sp->nst_flag |= NFSNST_GOTSTATE;
sp->nst_clp = clp;
}
/*
* This function is called for a reclaim, to see if it gets grace.
* It returns 0 if a reclaim is allowed, 1 otherwise.
*/
static int
nfsrv_checkstable(struct nfsclient *clp)
{
struct nfsrv_stable *sp;
/*
* First, find the entry for the client.
*/
LIST_FOREACH(sp, &nfsrv_stablefirst.nsf_head, nst_list) {
if (sp->nst_len == clp->lc_idlen &&
!NFSBCMP(sp->nst_client, clp->lc_id, sp->nst_len))
break;
}
/*
* If not in the list, state was revoked or no state was issued
* since the previous reboot, a reclaim is denied.
*/
if (sp == LIST_END(&nfsrv_stablefirst.nsf_head) ||
(sp->nst_flag & NFSNST_REVOKE) ||
!(nfsrv_stablefirst.nsf_flags & NFSNSF_OK))
return (1);
return (0);
}
/*
* Test for and try to clear out a conflicting client. This is called by
* nfsrv_lockctrl() and nfsrv_openctrl() when conflicts with other clients
* a found.
* The trick here is that it can't revoke a conflicting client with an
* expired lease unless it holds the v4root lock, so...
* If no v4root lock, get the lock and return 1 to indicate "try again".
* Return 0 to indicate the conflict can't be revoked and 1 to indicate
* the revocation worked and the conflicting client is "bye, bye", so it
* can be tried again.
* Unlocks State before a non-zero value is returned.
*/
static int
nfsrv_clientconflict(struct nfsclient *clp, int *haslockp, __unused vnode_t vp,
NFSPROC_T *p)
{
int gotlock;
/*
* If lease hasn't expired, we can't fix it.
*/
if (clp->lc_expiry >= NFSD_MONOSEC ||
!(nfsrv_stablefirst.nsf_flags & NFSNSF_UPDATEDONE))
return (0);
if (*haslockp == 0) {
NFSUNLOCKSTATE();
NFSVOPUNLOCK(vp, 0, p);
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
do {
gotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
NFSV4ROOTLOCKMUTEXPTR);
} while (!gotlock);
NFSUNLOCKV4ROOTMUTEX();
*haslockp = 1;
NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
return (1);
}
NFSUNLOCKSTATE();
/*
* Ok, we can expire the conflicting client.
*/
nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
nfsrv_cleanclient(clp, p);
nfsrv_freedeleglist(&clp->lc_deleg);
nfsrv_freedeleglist(&clp->lc_olddeleg);
LIST_REMOVE(clp, lc_hash);
nfsrv_zapclient(clp, p);
return (1);
}
/*
* Resolve a delegation conflict.
* Returns 0 to indicate the conflict was resolved without sleeping.
* Return -1 to indicate that the caller should check for conflicts again.
* Return > 0 for an error that should be returned, normally NFSERR_DELAY.
*
* Also, manipulate the nfsv4root_lock, as required. It isn't changed
* for a return of 0, since there was no sleep and it could be required
* later. It is released for a return of NFSERR_DELAY, since the caller
* will return that error. It is released when a sleep was done waiting
* for the delegation to be returned or expire (so that other nfsds can
* handle ops). Then, it must be acquired for the write to stable storage.
* (This function is somewhat similar to nfsrv_clientconflict(), but
* the semantics differ in a couple of subtle ways. The return of 0
* indicates the conflict was resolved without sleeping here, not
* that the conflict can't be resolved and the handling of nfsv4root_lock
* differs, as noted above.)
* Unlocks State before returning a non-zero value.
*/
static int
nfsrv_delegconflict(struct nfsstate *stp, int *haslockp, NFSPROC_T *p,
__unused vnode_t vp)
{
struct nfsclient *clp = stp->ls_clp;
int gotlock, error, retrycnt, zapped_clp;
nfsv4stateid_t tstateid;
fhandle_t tfh;
/*
* If the conflict is with an old delegation...
*/
if (stp->ls_flags & NFSLCK_OLDDELEG) {
/*
* You can delete it, if it has expired.
*/
if (clp->lc_delegtime < NFSD_MONOSEC) {
nfsrv_freedeleg(stp);
NFSUNLOCKSTATE();
return (-1);
}
NFSUNLOCKSTATE();
/*
* During this delay, the old delegation could expire or it
* could be recovered by the client via an Open with
* CLAIM_DELEGATE_PREV.
* Release the nfsv4root_lock, if held.
*/
if (*haslockp) {
*haslockp = 0;
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (NFSERR_DELAY);
}
/*
* It's a current delegation, so:
* - check to see if the delegation has expired
* - if so, get the v4root lock and then expire it
*/
if (!(stp->ls_flags & NFSLCK_DELEGRECALL)) {
/*
* - do a recall callback, since not yet done
* For now, never allow truncate to be set. To use
* truncate safely, it must be guaranteed that the
* Remove, Rename or Setattr with size of 0 will
* succeed and that would require major changes to
* the VFS/Vnode OPs.
* Set the expiry time large enough so that it won't expire
* until after the callback, then set it correctly, once
* the callback is done. (The delegation will now time
* out whether or not the Recall worked ok. The timeout
* will be extended when ops are done on the delegation
* stateid, up to the timelimit.)
*/
stp->ls_delegtime = NFSD_MONOSEC + (2 * nfsrv_lease) +
NFSRV_LEASEDELTA;
stp->ls_delegtimelimit = NFSD_MONOSEC + (6 * nfsrv_lease) +
NFSRV_LEASEDELTA;
stp->ls_flags |= NFSLCK_DELEGRECALL;
/*
* Loop NFSRV_CBRETRYCNT times while the CBRecall replies
* NFSERR_BADSTATEID or NFSERR_BADHANDLE. This is done
* in order to try and avoid a race that could happen
* when a CBRecall request passed the Open reply with
* the delegation in it when transitting the network.
* Since nfsrv_docallback will sleep, don't use stp after
* the call.
*/
NFSBCOPY((caddr_t)&stp->ls_stateid, (caddr_t)&tstateid,
sizeof (tstateid));
NFSBCOPY((caddr_t)&stp->ls_lfp->lf_fh, (caddr_t)&tfh,
sizeof (tfh));
NFSUNLOCKSTATE();
if (*haslockp) {
*haslockp = 0;
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
retrycnt = 0;
do {
error = nfsrv_docallback(clp, NFSV4OP_CBRECALL,
&tstateid, 0, &tfh, NULL, NULL, p);
retrycnt++;
} while ((error == NFSERR_BADSTATEID ||
error == NFSERR_BADHANDLE) && retrycnt < NFSV4_CBRETRYCNT);
return (NFSERR_DELAY);
}
if (clp->lc_expiry >= NFSD_MONOSEC &&
stp->ls_delegtime >= NFSD_MONOSEC) {
NFSUNLOCKSTATE();
/*
* A recall has been done, but it has not yet expired.
* So, RETURN_DELAY.
*/
if (*haslockp) {
*haslockp = 0;
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (NFSERR_DELAY);
}
/*
* If we don't yet have the lock, just get it and then return,
* since we need that before deleting expired state, such as
* this delegation.
* When getting the lock, unlock the vnode, so other nfsds that
* are in progress, won't get stuck waiting for the vnode lock.
*/
if (*haslockp == 0) {
NFSUNLOCKSTATE();
NFSVOPUNLOCK(vp, 0, p);
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
do {
gotlock = nfsv4_lock(&nfsv4rootfs_lock, 1, NULL,
NFSV4ROOTLOCKMUTEXPTR);
} while (!gotlock);
NFSUNLOCKV4ROOTMUTEX();
*haslockp = 1;
NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
return (-1);
}
NFSUNLOCKSTATE();
/*
* Ok, we can delete the expired delegation.
* First, write the Revoke record to stable storage and then
* clear out the conflict.
* Since all other nfsd threads are now blocked, we can safely
* sleep without the state changing.
*/
nfsrv_writestable(clp->lc_id, clp->lc_idlen, NFSNST_REVOKE, p);
if (clp->lc_expiry < NFSD_MONOSEC) {
nfsrv_cleanclient(clp, p);
nfsrv_freedeleglist(&clp->lc_deleg);
nfsrv_freedeleglist(&clp->lc_olddeleg);
LIST_REMOVE(clp, lc_hash);
zapped_clp = 1;
} else {
nfsrv_freedeleg(stp);
zapped_clp = 0;
}
if (zapped_clp)
nfsrv_zapclient(clp, p);
return (-1);
}
/*
* Check for a remove allowed, if remove is set to 1 and get rid of
* delegations.
*/
APPLESTATIC int
nfsrv_checkremove(vnode_t vp, int remove, NFSPROC_T *p)
{
struct nfsstate *stp;
struct nfslockfile *lfp;
int error, haslock = 0;
fhandle_t nfh;
/*
* First, get the lock file structure.
* (A return of -1 means no associated state, so remove ok.)
*/
error = nfsrv_getlockfh(vp, NFSLCK_CHECK, NULL, &nfh, p);
tryagain:
NFSLOCKSTATE();
if (!error)
error = nfsrv_getlockfile(NFSLCK_CHECK, NULL, &lfp, &nfh, 0);
if (error) {
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
if (error == -1)
return (0);
return (error);
}
/*
* Now, we must Recall any delegations.
*/
error = nfsrv_cleandeleg(vp, lfp, NULL, &haslock, p);
if (error) {
/*
* nfsrv_cleandeleg() unlocks state for non-zero
* return.
*/
if (error == -1)
goto tryagain;
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (error);
}
/*
* Now, look for a conflicting open share.
*/
if (remove) {
LIST_FOREACH(stp, &lfp->lf_open, ls_file) {
if (stp->ls_flags & NFSLCK_WRITEDENY) {
error = NFSERR_FILEOPEN;
break;
}
}
}
NFSUNLOCKSTATE();
if (haslock) {
NFSLOCKV4ROOTMUTEX();
nfsv4_unlock(&nfsv4rootfs_lock, 1);
NFSUNLOCKV4ROOTMUTEX();
}
return (error);
}
/*
* Clear out all delegations for the file referred to by lfp.
* May return NFSERR_DELAY, if there will be a delay waiting for
* delegations to expire.
* Returns -1 to indicate it slept while recalling a delegation.
* This function has the side effect of deleting the nfslockfile structure,
* if it no longer has associated state and didn't have to sleep.
* Unlocks State before a non-zero value is returned.
*/
static int
nfsrv_cleandeleg(vnode_t vp, struct nfslockfile *lfp,
struct nfsclient *clp, int *haslockp, NFSPROC_T *p)
{
struct nfsstate *stp, *nstp;
int ret;
stp = LIST_FIRST(&lfp->lf_deleg);
while (stp != LIST_END(&lfp->lf_deleg)) {
nstp = LIST_NEXT(stp, ls_file);
if (stp->ls_clp != clp) {
ret = nfsrv_delegconflict(stp, haslockp, p, vp);
if (ret) {
/*
* nfsrv_delegconflict() unlocks state
* when it returns non-zero.
*/
return (ret);
}
}
stp = nstp;
}
return (0);
}
/*
* There are certain operations that, when being done outside of NFSv4,
* require that any NFSv4 delegation for the file be recalled.
* This function is to be called for those cases:
* VOP_RENAME() - When a delegation is being recalled for any reason,
* the client may have to do Opens against the server, using the file's
* final component name. If the file has been renamed on the server,
* that component name will be incorrect and the Open will fail.
* VOP_REMOVE() - Theoretically, a client could Open a file after it has
* been removed on the server, if there is a delegation issued to
* that client for the file. I say "theoretically" since clients
* normally do an Access Op before the Open and that Access Op will
* fail with ESTALE. Note that NFSv2 and 3 don't even do Opens, so
* they will detect the file's removal in the same manner. (There is
* one case where RFC3530 allows a client to do an Open without first
* doing an Access Op, which is passage of a check against the ACE
* returned with a Write delegation, but current practice is to ignore
* the ACE and always do an Access Op.)
* Since the functions can only be called with an unlocked vnode, this
* can't be done at this time.
* VOP_ADVLOCK() - When a client holds a delegation, it can issue byte range
* locks locally in the client, which are not visible to the server. To
* deal with this, issuing of delegations for a vnode must be disabled
* and all delegations for the vnode recalled. This is done via the
* second function, using the VV_DISABLEDELEG vflag on the vnode.
*/
APPLESTATIC void
nfsd_recalldelegation(vnode_t vp, NFSPROC_T *p)
{
struct timespec mytime;
int32_t starttime;
int error;
KASSERT(!VOP_ISLOCKED(vp), ("vp %p is locked", vp));
/*
* First, check to see if the server is currently running and it has
* been called for a regular file when issuing delegations.
*/
if (newnfs_numnfsd == 0 || vp->v_type != VREG ||
nfsrv_issuedelegs == 0)
return;
/*
* First, get a reference on the nfsv4rootfs_lock so that an
* exclusive lock cannot be acquired by another thread.
*/
NFSLOCKV4ROOTMUTEX();
nfsv4_getref(&nfsv4rootfs_lock, NULL, NFSV4ROOTLOCKMUTEXPTR);
NFSUNLOCKV4ROOTMUTEX();
/*
* Now, call nfsrv_checkremove() in a loop while it returns
* NFSERR_DELAY. Return upon any other error or when timed out.
*/
NFSGETNANOTIME(&mytime);
starttime = (u_int32_t)mytime.tv_sec;
do {
error = nfsrv_checkremove(vp, 0, p);
if (error == NFSERR_DELAY) {
NFSGETNANOTIME(&mytime);
if (((u_int32_t)mytime.tv_sec - starttime) >
NFS_REMOVETIMEO &&
((u_int32_t)mytime.tv_sec - starttime) <
100000)
break;
/* Sleep for a short period of time */
(void) nfs_catnap(PZERO, 0, "nfsremove");
}
} while (error == NFSERR_DELAY);
NFSLOCKV4ROOTMUTEX();
nfsv4_relref(&nfsv4rootfs_lock);
NFSUNLOCKV4ROOTMUTEX();
}
APPLESTATIC void
nfsd_disabledelegation(vnode_t vp, NFSPROC_T *p)
{
#ifdef VV_DISABLEDELEG
/*
* First, flag issuance of delegations disabled.
*/
atomic_set_long(&vp->v_vflag, VV_DISABLEDELEG);
#endif
/*
* Then call nfsd_recalldelegation() to get rid of all extant
* delegations.
*/
nfsd_recalldelegation(vp, p);
}
/*
* Check for conflicting locks, etc. and then get rid of delegations.
* (At one point I thought that I should get rid of delegations for any
* Setattr, since it could potentially disallow the I/O op (read or write)
* allowed by the delegation. However, Setattr Ops that aren't changing
* the size get a stateid of all 0s, so you can't tell if it is a delegation
* for the same client or a different one, so I decided to only get rid
* of delegations for other clients when the size is being changed.)
* In general, a Setattr can disable NFS I/O Ops that are outstanding, such
* as Write backs, even if there is no delegation, so it really isn't any
* different?)
*/
APPLESTATIC int
nfsrv_checksetattr(vnode_t vp, struct nfsrv_descript *nd,
nfsv4stateid_t *stateidp, struct nfsvattr *nvap, nfsattrbit_t *attrbitp,
struct nfsexstuff *exp, NFSPROC_T *p)
{
struct nfsstate st, *stp = &st;
struct nfslock lo, *lop = &lo;
int error = 0;
nfsquad_t clientid;
if (NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_SIZE)) {
stp->ls_flags = (NFSLCK_CHECK | NFSLCK_WRITEACCESS);
lop->lo_first = nvap->na_size;
} else {
stp->ls_flags = 0;
lop->lo_first = 0;
}
if (NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_OWNER) ||
NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_OWNERGROUP) ||
NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_MODE) ||
NFSISSET_ATTRBIT(attrbitp, NFSATTRBIT_ACL))
stp->ls_flags |= NFSLCK_SETATTR;
if (stp->ls_flags == 0)
return (0);
lop->lo_end = NFS64BITSSET;
lop->lo_flags = NFSLCK_WRITE;
stp->ls_ownerlen = 0;
stp->ls_op = NULL;
stp->ls_uid = nd->nd_cred->cr_uid;
stp->ls_stateid.seqid = stateidp->seqid;
clientid.lval[0] = stp->ls_stateid.other[0] = stateidp->other[0];
clientid.lval[1] = stp->ls_stateid.other[1] = stateidp->other[1];
stp->ls_stateid.other[2] = stateidp->other[2];
error = nfsrv_lockctrl(vp, &stp, &lop, NULL, clientid,
stateidp, exp, nd, p);
return (error);
}
/*
* Check for a write delegation and do a CBGETATTR if there is one, updating
* the attributes, as required.
* Should I return an error if I can't get the attributes? (For now, I'll
* just return ok.
*/
APPLESTATIC int
nfsrv_checkgetattr(struct nfsrv_descript *nd, vnode_t vp,
struct nfsvattr *nvap, nfsattrbit_t *attrbitp, struct ucred *cred,
NFSPROC_T *p)
{
struct nfsstate *stp;
struct nfslockfile *lfp;
struct nfsclient *clp;
struct nfsvattr nva;
fhandle_t nfh;
int error;
nfsattrbit_t cbbits;
u_quad_t delegfilerev;
NFSCBGETATTR_ATTRBIT(attrbitp, &cbbits);
if (!NFSNONZERO_ATTRBIT(&cbbits))
return (0);
/*
* Get the lock file structure.
* (A return of -1 means no associated state, so return ok.)
*/
error = nfsrv_getlockfh(vp, NFSLCK_CHECK, NULL, &nfh, p);
NFSLOCKSTATE();
if (!error)
error = nfsrv_getlockfile(NFSLCK_CHECK, NULL, &lfp, &nfh, 0);
if (error) {
NFSUNLOCKSTATE();
if (error == -1)
return (0);
return (error);
}
/*
* Now, look for a write delegation.
*/
LIST_FOREACH(stp, &lfp->lf_deleg, ls_file) {
if (stp->ls_flags & NFSLCK_DELEGWRITE)
break;
}
if (stp == LIST_END(&lfp->lf_deleg)) {
NFSUNLOCKSTATE();
return (0);
}
clp = stp->ls_clp;
delegfilerev = stp->ls_filerev;
/*
* If the Write delegation was issued as a part of this Compound RPC
* or if we have an Implied Clientid (used in a previous Op in this
* compound) and it is the client the delegation was issued to,
* just return ok.
* I also assume that it is from the same client iff the network
* host IP address is the same as the callback address. (Not
* exactly correct by the RFC, but avoids a lot of Getattr
* callbacks.)
*/
if (nd->nd_compref == stp->ls_compref ||
((nd->nd_flag & ND_IMPLIEDCLID) &&
clp->lc_clientid.qval == nd->nd_clientid.qval) ||
nfsaddr2_match(clp->lc_req.nr_nam, nd->nd_nam)) {
NFSUNLOCKSTATE();
return (0);
}
/*
* We are now done with the delegation state structure,
* so the statelock can be released and we can now tsleep().
*/
/*
* Now, we must do the CB Getattr callback, to see if Change or Size
* has changed.
*/
if (clp->lc_expiry >= NFSD_MONOSEC) {
NFSUNLOCKSTATE();
NFSVNO_ATTRINIT(&nva);
nva.na_filerev = NFS64BITSSET;
error = nfsrv_docallback(clp, NFSV4OP_CBGETATTR, NULL,
0, &nfh, &nva, &cbbits, p);
if (!error) {
if ((nva.na_filerev != NFS64BITSSET &&
nva.na_filerev > delegfilerev) ||
(NFSVNO_ISSETSIZE(&nva) &&
nva.na_size != nvap->na_size)) {
nfsvno_updfilerev(vp, nvap, cred, p);
if (NFSVNO_ISSETSIZE(&nva))
nvap->na_size = nva.na_size;
}
}
} else {
NFSUNLOCKSTATE();
}
return (0);
}
/*
* This function looks for openowners that haven't had any opens for
* a while and throws them away. Called by an nfsd when NFSNSF_NOOPENS
* is set.
*/
APPLESTATIC void
nfsrv_throwawayopens(NFSPROC_T *p)
{
struct nfsclient *clp, *nclp;
struct nfsstate *stp, *nstp;
int i;
NFSLOCKSTATE();
nfsrv_stablefirst.nsf_flags &= ~NFSNSF_NOOPENS;
/*
* For each client...
*/
for (i = 0; i < NFSCLIENTHASHSIZE; i++) {
LIST_FOREACH_SAFE(clp, &nfsclienthash[i], lc_hash, nclp) {
LIST_FOREACH_SAFE(stp, &clp->lc_open, ls_list, nstp) {
if (LIST_EMPTY(&stp->ls_open) &&
(stp->ls_noopens > NFSNOOPEN ||
(nfsrv_openpluslock * 2) >
NFSRV_V4STATELIMIT))
nfsrv_freeopenowner(stp, 0, p);
}
}
}
NFSUNLOCKSTATE();
}
/*
* This function checks to see if the credentials are the same.
* Returns 1 for not same, 0 otherwise.
*/
static int
nfsrv_notsamecredname(struct nfsrv_descript *nd, struct nfsclient *clp)
{
if (nd->nd_flag & ND_GSS) {
if (!(clp->lc_flags & LCL_GSS))
return (1);
if (clp->lc_flags & LCL_NAME) {
if (nd->nd_princlen != clp->lc_namelen ||
NFSBCMP(nd->nd_principal, clp->lc_name,
clp->lc_namelen))
return (1);
else
return (0);
}
if (nd->nd_cred->cr_uid == clp->lc_uid)
return (0);
else
return (1);
} else if (clp->lc_flags & LCL_GSS)
return (1);
/*
* For AUTH_SYS, allow the same uid or root. (This is underspecified
* in RFC3530, which talks about principals, but doesn't say anything
* about uids for AUTH_SYS.)
*/
if (nd->nd_cred->cr_uid == clp->lc_uid || nd->nd_cred->cr_uid == 0)
return (0);
else
return (1);
}
/*
* Calculate the lease expiry time.
*/
static time_t
nfsrv_leaseexpiry(void)
{
struct timeval curtime;
NFSGETTIME(&curtime);
if (nfsrv_stablefirst.nsf_eograce > NFSD_MONOSEC)
return (NFSD_MONOSEC + 2 * (nfsrv_lease + NFSRV_LEASEDELTA));
return (NFSD_MONOSEC + nfsrv_lease + NFSRV_LEASEDELTA);
}
/*
* Delay the delegation timeout as far as ls_delegtimelimit, as required.
*/
static void
nfsrv_delaydelegtimeout(struct nfsstate *stp)
{
if ((stp->ls_flags & NFSLCK_DELEGRECALL) == 0)
return;
if ((stp->ls_delegtime + 15) > NFSD_MONOSEC &&
stp->ls_delegtime < stp->ls_delegtimelimit) {
stp->ls_delegtime += nfsrv_lease;
if (stp->ls_delegtime > stp->ls_delegtimelimit)
stp->ls_delegtime = stp->ls_delegtimelimit;
}
}
/*
* This function checks to see if there is any other state associated
* with the openowner for this Open.
* It returns 1 if there is no other state, 0 otherwise.
*/
static int
nfsrv_nootherstate(struct nfsstate *stp)
{
struct nfsstate *tstp;
LIST_FOREACH(tstp, &stp->ls_openowner->ls_open, ls_list) {
if (tstp != stp || !LIST_EMPTY(&tstp->ls_lock))
return (0);
}
return (1);
}
/*
* Create a list of lock deltas (changes to local byte range locking
* that can be rolled back using the list) and apply the changes via
* nfsvno_advlock(). Optionally, lock the list. It is expected that either
* the rollback or update function will be called after this.
* It returns an error (and rolls back, as required), if any nfsvno_advlock()
* call fails. If it returns an error, it will unlock the list.
*/
static int
nfsrv_locallock(vnode_t vp, struct nfslockfile *lfp, int flags,
uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p)
{
struct nfslock *lop, *nlop;
int error = 0;
/* Loop through the list of locks. */
lop = LIST_FIRST(&lfp->lf_locallock);
while (first < end && lop != NULL) {
nlop = LIST_NEXT(lop, lo_lckowner);
if (first >= lop->lo_end) {
/* not there yet */
lop = nlop;
} else if (first < lop->lo_first) {
/* new one starts before entry in list */
if (end <= lop->lo_first) {
/* no overlap between old and new */
error = nfsrv_dolocal(vp, lfp, flags,
NFSLCK_UNLOCK, first, end, cfp, p);
if (error != 0)
break;
first = end;
} else {
/* handle fragment overlapped with new one */
error = nfsrv_dolocal(vp, lfp, flags,
NFSLCK_UNLOCK, first, lop->lo_first, cfp,
p);
if (error != 0)
break;
first = lop->lo_first;
}
} else {
/* new one overlaps this entry in list */
if (end <= lop->lo_end) {
/* overlaps all of new one */
error = nfsrv_dolocal(vp, lfp, flags,
lop->lo_flags, first, end, cfp, p);
if (error != 0)
break;
first = end;
} else {
/* handle fragment overlapped with new one */
error = nfsrv_dolocal(vp, lfp, flags,
lop->lo_flags, first, lop->lo_end, cfp, p);
if (error != 0)
break;
first = lop->lo_end;
lop = nlop;
}
}
}
if (first < end && error == 0)
/* handle fragment past end of list */
error = nfsrv_dolocal(vp, lfp, flags, NFSLCK_UNLOCK, first,
end, cfp, p);
return (error);
}
/*
* Local lock unlock. Unlock all byte ranges that are no longer locked
* by NFSv4. To do this, unlock any subranges of first-->end that
* do not overlap with the byte ranges of any lock in the lfp->lf_lock
* list. This list has all locks for the file held by other
* <clientid, lockowner> tuples. The list is ordered by increasing
* lo_first value, but may have entries that overlap each other, for
* the case of read locks.
*/
static void
nfsrv_localunlock(vnode_t vp, struct nfslockfile *lfp, uint64_t init_first,
uint64_t init_end, NFSPROC_T *p)
{
struct nfslock *lop;
uint64_t first, end, prevfirst;
first = init_first;
end = init_end;
while (first < init_end) {
/* Loop through all nfs locks, adjusting first and end */
prevfirst = 0;
LIST_FOREACH(lop, &lfp->lf_lock, lo_lckfile) {
KASSERT(prevfirst <= lop->lo_first,
("nfsv4 locks out of order"));
KASSERT(lop->lo_first < lop->lo_end,
("nfsv4 bogus lock"));
prevfirst = lop->lo_first;
if (first >= lop->lo_first &&
first < lop->lo_end)
/*
* Overlaps with initial part, so trim
* off that initial part by moving first past
* it.
*/
first = lop->lo_end;
else if (end > lop->lo_first &&
lop->lo_first > first) {
/*
* This lock defines the end of the
* segment to unlock, so set end to the
* start of it and break out of the loop.
*/
end = lop->lo_first;
break;
}
if (first >= end)
/*
* There is no segment left to do, so
* break out of this loop and then exit
* the outer while() since first will be set
* to end, which must equal init_end here.
*/
break;
}
if (first < end) {
/* Unlock this segment */
(void) nfsrv_dolocal(vp, lfp, NFSLCK_UNLOCK,
NFSLCK_READ, first, end, NULL, p);
nfsrv_locallock_commit(lfp, NFSLCK_UNLOCK,
first, end);
}
/*
* Now move past this segment and look for any further
* segment in the range, if there is one.
*/
first = end;
end = init_end;
}
}
/*
* Do the local lock operation and update the rollback list, as required.
* Perform the rollback and return the error if nfsvno_advlock() fails.
*/
static int
nfsrv_dolocal(vnode_t vp, struct nfslockfile *lfp, int flags, int oldflags,
uint64_t first, uint64_t end, struct nfslockconflict *cfp, NFSPROC_T *p)
{
struct nfsrollback *rlp;
int error, ltype, oldltype;
if (flags & NFSLCK_WRITE)
ltype = F_WRLCK;
else if (flags & NFSLCK_READ)
ltype = F_RDLCK;
else
ltype = F_UNLCK;
if (oldflags & NFSLCK_WRITE)
oldltype = F_WRLCK;
else if (oldflags & NFSLCK_READ)
oldltype = F_RDLCK;
else
oldltype = F_UNLCK;
if (ltype == oldltype || (oldltype == F_WRLCK && ltype == F_RDLCK))
/* nothing to do */
return (0);
error = nfsvno_advlock(vp, ltype, first, end, p);
if (error != 0) {
if (cfp != NULL) {
cfp->cl_clientid.lval[0] = 0;
cfp->cl_clientid.lval[1] = 0;
cfp->cl_first = 0;
cfp->cl_end = NFS64BITSSET;
cfp->cl_flags = NFSLCK_WRITE;
cfp->cl_ownerlen = 5;
NFSBCOPY("LOCAL", cfp->cl_owner, 5);
}
nfsrv_locallock_rollback(vp, lfp, p);
} else if (ltype != F_UNLCK) {
rlp = malloc(sizeof (struct nfsrollback), M_NFSDROLLBACK,
M_WAITOK);
rlp->rlck_first = first;
rlp->rlck_end = end;
rlp->rlck_type = oldltype;
LIST_INSERT_HEAD(&lfp->lf_rollback, rlp, rlck_list);
}
return (error);
}
/*
* Roll back local lock changes and free up the rollback list.
*/
static void
nfsrv_locallock_rollback(vnode_t vp, struct nfslockfile *lfp, NFSPROC_T *p)
{
struct nfsrollback *rlp, *nrlp;
LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list, nrlp) {
(void) nfsvno_advlock(vp, rlp->rlck_type, rlp->rlck_first,
rlp->rlck_end, p);
free(rlp, M_NFSDROLLBACK);
}
LIST_INIT(&lfp->lf_rollback);
}
/*
* Update local lock list and delete rollback list (ie now committed to the
* local locks). Most of the work is done by the internal function.
*/
static void
nfsrv_locallock_commit(struct nfslockfile *lfp, int flags, uint64_t first,
uint64_t end)
{
struct nfsrollback *rlp, *nrlp;
struct nfslock *new_lop, *other_lop;
new_lop = malloc(sizeof (struct nfslock), M_NFSDLOCK, M_WAITOK);
if (flags & (NFSLCK_READ | NFSLCK_WRITE))
other_lop = malloc(sizeof (struct nfslock), M_NFSDLOCK,
M_WAITOK);
else
other_lop = NULL;
new_lop->lo_flags = flags;
new_lop->lo_first = first;
new_lop->lo_end = end;
nfsrv_updatelock(NULL, &new_lop, &other_lop, lfp);
if (new_lop != NULL)
free(new_lop, M_NFSDLOCK);
if (other_lop != NULL)
free(other_lop, M_NFSDLOCK);
/* and get rid of the rollback list */
LIST_FOREACH_SAFE(rlp, &lfp->lf_rollback, rlck_list, nrlp)
free(rlp, M_NFSDROLLBACK);
LIST_INIT(&lfp->lf_rollback);
}
/*
* Lock the struct nfslockfile for local lock updating.
*/
static void
nfsrv_locklf(struct nfslockfile *lfp)
{
int gotlock;
/* lf_usecount ensures *lfp won't be free'd */
lfp->lf_usecount++;
do {
gotlock = nfsv4_lock(&lfp->lf_locallock_lck, 1, NULL,
NFSSTATEMUTEXPTR);
} while (gotlock == 0);
lfp->lf_usecount--;
}
/*
* Unlock the struct nfslockfile after local lock updating.
*/
static void
nfsrv_unlocklf(struct nfslockfile *lfp)
{
nfsv4_unlock(&lfp->lf_locallock_lck, 0);
}
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