stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
/* Will be incremented before return to client: */
atomic_set(&stid->sc_count, 1);
+ spin_lock_init(&stid->sc_lock);
/*
* It shouldn't be a problem to reuse an opaque stateid value.
put_nfs4_file(fp);
}
+void
+nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
+{
+ stateid_t *src = &stid->sc_stateid;
+
+ spin_lock(&stid->sc_lock);
+ if (unlikely(++src->si_generation == 0))
+ src->si_generation = 1;
+ memcpy(dst, src, sizeof(*dst));
+ spin_unlock(&stid->sc_lock);
+}
+
static void nfs4_put_deleg_lease(struct nfs4_file *fp)
{
struct file *filp = NULL;
s->sc_type = 0;
}
-static void
+/**
+ * nfs4_get_existing_delegation - Discover if this delegation already exists
+ * @clp: a pointer to the nfs4_client we're granting a delegation to
+ * @fp: a pointer to the nfs4_file we're granting a delegation on
+ *
+ * Return:
+ * On success: NULL if an existing delegation was not found.
+ *
+ * On error: -EAGAIN if one was previously granted to this nfs4_client
+ * for this nfs4_file.
+ *
+ */
+
+static int
+nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp)
+{
+ struct nfs4_delegation *searchdp = NULL;
+ struct nfs4_client *searchclp = NULL;
+
+ lockdep_assert_held(&state_lock);
+ lockdep_assert_held(&fp->fi_lock);
+
+ list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
+ searchclp = searchdp->dl_stid.sc_client;
+ if (clp == searchclp) {
+ return -EAGAIN;
+ }
+ }
+ return 0;
+}
+
+/**
+ * hash_delegation_locked - Add a delegation to the appropriate lists
+ * @dp: a pointer to the nfs4_delegation we are adding.
+ * @fp: a pointer to the nfs4_file we're granting a delegation on
+ *
+ * Return:
+ * On success: NULL if the delegation was successfully hashed.
+ *
+ * On error: -EAGAIN if one was previously granted to this
+ * nfs4_client for this nfs4_file. Delegation is not hashed.
+ *
+ */
+
+static int
hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
{
+ int status;
+ struct nfs4_client *clp = dp->dl_stid.sc_client;
+
lockdep_assert_held(&state_lock);
lockdep_assert_held(&fp->fi_lock);
+ status = nfs4_get_existing_delegation(clp, fp);
+ if (status)
+ return status;
+ ++fp->fi_delegees;
atomic_inc(&dp->dl_stid.sc_count);
dp->dl_stid.sc_type = NFS4_DELEG_STID;
list_add(&dp->dl_perfile, &fp->fi_delegations);
- list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
+ list_add(&dp->dl_perclnt, &clp->cl_delegations);
+ return 0;
}
static bool
clid->flags = new->cl_exchange_flags;
}
+static bool client_has_openowners(struct nfs4_client *clp)
+{
+ struct nfs4_openowner *oo;
+
+ list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
+ if (!list_empty(&oo->oo_owner.so_stateids))
+ return true;
+ }
+ return false;
+}
+
static bool client_has_state(struct nfs4_client *clp)
{
- /*
- * Note clp->cl_openowners check isn't quite right: there's no
- * need to count owners without stateid's.
- *
- * Also note we should probably be using this in 4.0 case too.
- */
- return !list_empty(&clp->cl_openowners)
+ return client_has_openowners(clp)
#ifdef CONFIG_NFSD_PNFS
|| !list_empty(&clp->cl_lo_states)
#endif
/* Cases below refer to rfc 3530 section 14.2.33: */
spin_lock(&nn->client_lock);
conf = find_confirmed_client_by_name(&clname, nn);
- if (conf) {
+ if (conf && client_has_state(conf)) {
/* case 0: */
status = nfserr_clid_inuse;
if (clp_used_exchangeid(conf))
} else { /* case 3: normal case; new or rebooted client */
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
if (old) {
+ status = nfserr_clid_inuse;
+ if (client_has_state(old)
+ && !same_creds(&unconf->cl_cred,
+ &old->cl_cred))
+ goto out;
status = mark_client_expired_locked(old);
if (status) {
old = NULL;
.so_free = nfs4_free_openowner,
};
+static struct nfs4_ol_stateid *
+nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
+{
+ struct nfs4_ol_stateid *local, *ret = NULL;
+ struct nfs4_openowner *oo = open->op_openowner;
+
+ lockdep_assert_held(&fp->fi_lock);
+
+ list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
+ /* ignore lock owners */
+ if (local->st_stateowner->so_is_open_owner == 0)
+ continue;
+ if (local->st_stateowner == &oo->oo_owner) {
+ ret = local;
+ atomic_inc(&ret->st_stid.sc_count);
+ break;
+ }
+ }
+ return ret;
+}
+
static struct nfs4_openowner *
alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
struct nfsd4_compound_state *cstate)
return ret;
}
-static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
+static struct nfs4_ol_stateid *
+init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
+ struct nfsd4_open *open)
+{
+
struct nfs4_openowner *oo = open->op_openowner;
+ struct nfs4_ol_stateid *retstp = NULL;
+ spin_lock(&oo->oo_owner.so_client->cl_lock);
+ spin_lock(&fp->fi_lock);
+
+ retstp = nfsd4_find_existing_open(fp, open);
+ if (retstp)
+ goto out_unlock;
atomic_inc(&stp->st_stid.sc_count);
stp->st_stid.sc_type = NFS4_OPEN_STID;
INIT_LIST_HEAD(&stp->st_locks);
stp->st_access_bmap = 0;
stp->st_deny_bmap = 0;
stp->st_openstp = NULL;
- spin_lock(&oo->oo_owner.so_client->cl_lock);
+ init_rwsem(&stp->st_rwsem);
list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
- spin_lock(&fp->fi_lock);
list_add(&stp->st_perfile, &fp->fi_stateids);
+
+out_unlock:
spin_unlock(&fp->fi_lock);
spin_unlock(&oo->oo_owner.so_client->cl_lock);
+ return retstp;
}
/*
return nfs_ok;
}
-static struct nfs4_ol_stateid *
-nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
-{
- struct nfs4_ol_stateid *local, *ret = NULL;
- struct nfs4_openowner *oo = open->op_openowner;
-
- spin_lock(&fp->fi_lock);
- list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
- /* ignore lock owners */
- if (local->st_stateowner->so_is_open_owner == 0)
- continue;
- if (local->st_stateowner == &oo->oo_owner) {
- ret = local;
- atomic_inc(&ret->st_stid.sc_count);
- break;
- }
- }
- spin_unlock(&fp->fi_lock);
- return ret;
-}
-
static inline int nfs4_access_to_access(u32 nfs4_access)
{
int flags = 0;
return fl;
}
+/**
+ * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
+ * @dp: a pointer to the nfs4_delegation we're adding.
+ *
+ * Return:
+ * On success: Return code will be 0 on success.
+ *
+ * On error: -EAGAIN if there was an existing delegation.
+ * nonzero if there is an error in other cases.
+ *
+ */
+
static int nfs4_setlease(struct nfs4_delegation *dp)
{
struct nfs4_file *fp = dp->dl_stid.sc_file;
goto out_unlock;
/* Race breaker */
if (fp->fi_deleg_file) {
- status = 0;
- ++fp->fi_delegees;
- hash_delegation_locked(dp, fp);
+ status = hash_delegation_locked(dp, fp);
goto out_unlock;
}
fp->fi_deleg_file = filp;
- fp->fi_delegees = 1;
- hash_delegation_locked(dp, fp);
+ fp->fi_delegees = 0;
+ status = hash_delegation_locked(dp, fp);
spin_unlock(&fp->fi_lock);
spin_unlock(&state_lock);
+ if (status) {
+ /* Should never happen, this is a new fi_deleg_file */
+ WARN_ON_ONCE(1);
+ goto out_fput;
+ }
return 0;
out_unlock:
spin_unlock(&fp->fi_lock);
if (fp->fi_had_conflict)
return ERR_PTR(-EAGAIN);
+ spin_lock(&state_lock);
+ spin_lock(&fp->fi_lock);
+ status = nfs4_get_existing_delegation(clp, fp);
+ spin_unlock(&fp->fi_lock);
+ spin_unlock(&state_lock);
+
+ if (status)
+ return ERR_PTR(status);
+
dp = alloc_init_deleg(clp, fh, odstate);
if (!dp)
return ERR_PTR(-ENOMEM);
status = -EAGAIN;
goto out_unlock;
}
- ++fp->fi_delegees;
- hash_delegation_locked(dp, fp);
- status = 0;
+ status = hash_delegation_locked(dp, fp);
out_unlock:
spin_unlock(&fp->fi_lock);
spin_unlock(&state_lock);
struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
struct nfs4_file *fp = NULL;
struct nfs4_ol_stateid *stp = NULL;
+ struct nfs4_ol_stateid *swapstp = NULL;
struct nfs4_delegation *dp = NULL;
__be32 status;
status = nfs4_check_deleg(cl, open, &dp);
if (status)
goto out;
+ spin_lock(&fp->fi_lock);
stp = nfsd4_find_existing_open(fp, open);
+ spin_unlock(&fp->fi_lock);
} else {
open->op_file = NULL;
status = nfserr_bad_stateid;
*/
if (stp) {
/* Stateid was found, this is an OPEN upgrade */
+ down_read(&stp->st_rwsem);
status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
- if (status)
+ if (status) {
+ up_read(&stp->st_rwsem);
goto out;
+ }
} else {
stp = open->op_stp;
open->op_stp = NULL;
- init_open_stateid(stp, fp, open);
+ swapstp = init_open_stateid(stp, fp, open);
+ if (swapstp) {
+ nfs4_put_stid(&stp->st_stid);
+ stp = swapstp;
+ down_read(&stp->st_rwsem);
+ status = nfs4_upgrade_open(rqstp, fp, current_fh,
+ stp, open);
+ if (status) {
+ up_read(&stp->st_rwsem);
+ goto out;
+ }
+ goto upgrade_out;
+ }
+ down_read(&stp->st_rwsem);
status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
if (status) {
+ up_read(&stp->st_rwsem);
release_open_stateid(stp);
goto out;
}
if (stp->st_clnt_odstate == open->op_odstate)
open->op_odstate = NULL;
}
- update_stateid(&stp->st_stid.sc_stateid);
- memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+upgrade_out:
+ nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
+ up_read(&stp->st_rwsem);
if (nfsd4_has_session(&resp->cstate)) {
if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
* revoked delegations are kept only for free_stateid.
*/
return nfserr_bad_stateid;
+ down_write(&stp->st_rwsem);
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
- if (status)
- return status;
- return nfs4_check_fh(current_fh, &stp->st_stid);
+ if (status == nfs_ok)
+ status = nfs4_check_fh(current_fh, &stp->st_stid);
+ if (status != nfs_ok)
+ up_write(&stp->st_rwsem);
+ return status;
}
/*
return status;
oo = openowner(stp->st_stateowner);
if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
+ up_write(&stp->st_rwsem);
nfs4_put_stid(&stp->st_stid);
return nfserr_bad_stateid;
}
goto out;
oo = openowner(stp->st_stateowner);
status = nfserr_bad_stateid;
- if (oo->oo_flags & NFS4_OO_CONFIRMED)
+ if (oo->oo_flags & NFS4_OO_CONFIRMED) {
+ up_write(&stp->st_rwsem);
goto put_stateid;
+ }
oo->oo_flags |= NFS4_OO_CONFIRMED;
- update_stateid(&stp->st_stid.sc_stateid);
- memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+ nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
+ up_write(&stp->st_rwsem);
dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
__func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
goto put_stateid;
}
nfs4_stateid_downgrade(stp, od->od_share_access);
-
reset_union_bmap_deny(od->od_share_deny, stp);
-
- update_stateid(&stp->st_stid.sc_stateid);
- memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+ nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
status = nfs_ok;
put_stateid:
+ up_write(&stp->st_rwsem);
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
nfsd4_bump_seqid(cstate, status);
if (status)
goto out;
- update_stateid(&stp->st_stid.sc_stateid);
- memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+ nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
+ up_write(&stp->st_rwsem);
nfsd4_close_open_stateid(stp);
stp->st_access_bmap = 0;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
+ init_rwsem(&stp->st_rwsem);
list_add(&stp->st_locks, &open_stp->st_locks);
list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
spin_lock(&fp->fi_lock);
&open_stp, nn);
if (status)
goto out;
+ up_write(&open_stp->st_rwsem);
open_sop = openowner(open_stp->st_stateowner);
status = nfserr_bad_stateid;
if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
goto out;
status = lookup_or_create_lock_state(cstate, open_stp, lock,
&lock_stp, &new);
+ if (status == nfs_ok)
+ down_write(&lock_stp->st_rwsem);
} else {
status = nfs4_preprocess_seqid_op(cstate,
lock->lk_old_lock_seqid,
err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
switch (-err) {
case 0: /* success! */
- update_stateid(&lock_stp->st_stid.sc_stateid);
- memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
- sizeof(stateid_t));
+ nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
status = 0;
break;
case (EAGAIN): /* conflock holds conflicting lock */
seqid_mutating_err(ntohl(status)))
lock_sop->lo_owner.so_seqid++;
+ up_write(&lock_stp->st_rwsem);
+
/*
* If this is a new, never-before-used stateid, and we are
* returning an error, then just go ahead and release it.
dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
goto out_nfserr;
}
- update_stateid(&stp->st_stid.sc_stateid);
- memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+ nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
fput:
fput(filp);
put_stateid:
+ up_write(&stp->st_rwsem);
nfs4_put_stid(&stp->st_stid);
out:
nfsd4_bump_seqid(cstate, status);
projects / firefly-linux-kernel-4.4.55.git / blobdiff