by Chuck Lever III

[permalink] [raw]

Subject: Re: [PATCH 05/13] nfsd: split sc_status out of sc_type

On Mon, Jan 29, 2024 at 02:29:27PM +1100, NeilBrown wrote:
> sc_type identifies the type of a state - open, lock, deleg, layout - and
> also the status of a state - closed or revoked.
>
> This is a bit untidy and could get worse when "admin-revoked" states are
> added. So clean it up.
>
> With this patch, the type is now all that is stored in sc_type. This is
> zero when the state is first added to ->cl_stateids (causing it to be
> ignored), and is then set appropriately once it is fully initialised.
> It is set under ->cl_lock to ensure atomicity w.r.t lookup. It is now
> never cleared.
>
> sc_type is still a bit-set even though at most one bit is set. This allows
> lookup functions to be given a bitmap of acceptable types.
>
> sc_type is now an unsigned short rather than char. There is no value in
> restricting to just 8 bits.
>
> All the constants now start SC_TYPE_ matching the field in which they
> are stored. Keeping the existing names and ensuring clear separation
> from non-type flags would have required something like
> NFS4_STID_TYPE_CLOSED which is cumbersome. The "NFS4" prefix is
> redundant was they only appear in NFS4 code, so remove that and change
> STID to SC to match the field.
>
> The status is stored in a separate unsigned short named "sc_status". It
> has two flags: SC_STATUS_CLOSED and SC_STATUS_REVOKED.
> CLOSED combines NFS4_CLOSED_STID, NFS4_CLOSED_DELEG_STID, and is used
> for SC_TYPE_LOCK and SC_TYPE_LAYOUT instead of setting the sc_type to zero.
> These flags are only ever set, never cleared.
> For deleg stateids they are set under the global state_lock.
> For open and lock stateids they are set under ->cl_lock.
> For layout stateids they are set under ->ls_lock
>
> nfs4_unhash_stid() has been removed, and we never set sc_type = 0. This
> was only used for LOCK and LAYOUT stids and they now use
> SC_STATUS_CLOSED.
>
> Also TRACE_DEFINE_NUM() calls for the various STID #define have been
> removed because these things are not enums, and so that call is
> incorrect.
>
> Signed-off-by: NeilBrown <[email protected]>
> ---
> fs/nfsd/nfs4layouts.c | 14 +--
> fs/nfsd/nfs4state.c | 207 +++++++++++++++++++++---------------------
> fs/nfsd/state.h | 40 +++++---
> fs/nfsd/trace.h | 31 +++----
> 4 files changed, 151 insertions(+), 141 deletions(-)

This one doesn't apply cleanly to nfsd-next. Can you do a quick
rebase onto nfsd-next and send a fresh version of the series?

> diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c
> index 5e8096bc5eaa..857b822450b4 100644
> --- a/fs/nfsd/nfs4layouts.c
> +++ b/fs/nfsd/nfs4layouts.c
> @@ -236,7 +236,7 @@ nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
> nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
> NFSPROC4_CLNT_CB_LAYOUT);
>
> - if (parent->sc_type == NFS4_DELEG_STID)
> + if (parent->sc_type == SC_TYPE_DELEG)
> ls->ls_file = nfsd_file_get(fp->fi_deleg_file);
> else
> ls->ls_file = find_any_file(fp);
> @@ -250,7 +250,7 @@ nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
> }
>
> spin_lock(&clp->cl_lock);
> - stp->sc_type = NFS4_LAYOUT_STID;
> + stp->sc_type = SC_TYPE_LAYOUT;
> list_add(&ls->ls_perclnt, &clp->cl_lo_states);
> spin_unlock(&clp->cl_lock);
>
> @@ -269,13 +269,13 @@ nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
> {
> struct nfs4_layout_stateid *ls;
> struct nfs4_stid *stid;
> - unsigned char typemask = NFS4_LAYOUT_STID;
> + unsigned short typemask = SC_TYPE_LAYOUT;
> __be32 status;
>
> if (create)
> - typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
> + typemask |= (SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG);
>
> - status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
> + status = nfsd4_lookup_stateid(cstate, stateid, typemask, 0, &stid,
> net_generic(SVC_NET(rqstp), nfsd_net_id));
> if (status)
> goto out;
> @@ -286,7 +286,7 @@ nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
> goto out_put_stid;
> }
>
> - if (stid->sc_type != NFS4_LAYOUT_STID) {
> + if (stid->sc_type != SC_TYPE_LAYOUT) {
> ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
> nfs4_put_stid(stid);
>
> @@ -518,7 +518,7 @@ nfsd4_return_file_layouts(struct svc_rqst *rqstp,
> lrp->lrs_present = true;
> } else {
> trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid);
> - nfs4_unhash_stid(&ls->ls_stid);
> + ls->ls_stid.sc_status |= SC_STATUS_CLOSED;
> lrp->lrs_present = false;
> }
> spin_unlock(&ls->ls_lock);
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index dbf9ed84610e..6bccdd0af814 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -1260,11 +1260,6 @@ static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
> nfs4_put_stid(&dp->dl_stid);
> }
>
> -void nfs4_unhash_stid(struct nfs4_stid *s)
> -{
> - s->sc_type = 0;
> -}
> -
> /**
> * nfs4_delegation_exists - Discover if this delegation already exists
> * @clp: a pointer to the nfs4_client we're granting a delegation to
> @@ -1317,7 +1312,7 @@ hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
> if (nfs4_delegation_exists(clp, fp))
> return -EAGAIN;
> refcount_inc(&dp->dl_stid.sc_count);
> - dp->dl_stid.sc_type = NFS4_DELEG_STID;
> + dp->dl_stid.sc_type = SC_TYPE_DELEG;
> list_add(&dp->dl_perfile, &fp->fi_delegations);
> list_add(&dp->dl_perclnt, &clp->cl_delegations);
> return 0;
> @@ -1329,7 +1324,7 @@ static bool delegation_hashed(struct nfs4_delegation *dp)
> }
>
> static bool
> -unhash_delegation_locked(struct nfs4_delegation *dp, unsigned char type)
> +unhash_delegation_locked(struct nfs4_delegation *dp, unsigned short statusmask)
> {
> struct nfs4_file *fp = dp->dl_stid.sc_file;
>
> @@ -1339,8 +1334,9 @@ unhash_delegation_locked(struct nfs4_delegation *dp, unsigned char type)
> return false;
>
> if (dp->dl_stid.sc_client->cl_minorversion == 0)
> - type = NFS4_CLOSED_DELEG_STID;
> - dp->dl_stid.sc_type = type;
> + statusmask = SC_STATUS_CLOSED;
> + dp->dl_stid.sc_status |= statusmask;
> +
> /* Ensure that deleg break won't try to requeue it */
> ++dp->dl_time;
> spin_lock(&fp->fi_lock);
> @@ -1356,7 +1352,7 @@ static void destroy_delegation(struct nfs4_delegation *dp)
> bool unhashed;
>
> spin_lock(&state_lock);
> - unhashed = unhash_delegation_locked(dp, NFS4_CLOSED_DELEG_STID);
> + unhashed = unhash_delegation_locked(dp, SC_STATUS_CLOSED);
> spin_unlock(&state_lock);
> if (unhashed)
> destroy_unhashed_deleg(dp);
> @@ -1370,7 +1366,7 @@ static void revoke_delegation(struct nfs4_delegation *dp)
>
> trace_nfsd_stid_revoke(&dp->dl_stid);
>
> - if (dp->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
> + if (dp->dl_stid.sc_status & SC_STATUS_REVOKED) {
> spin_lock(&clp->cl_lock);
> refcount_inc(&dp->dl_stid.sc_count);
> list_add(&dp->dl_recall_lru, &clp->cl_revoked);
> @@ -1379,8 +1375,8 @@ static void revoke_delegation(struct nfs4_delegation *dp)
> destroy_unhashed_deleg(dp);
> }
>
> -/*
> - * SETCLIENTID state
> +/*
> + * SETCLIENTID state
> */
>
> static unsigned int clientid_hashval(u32 id)
> @@ -1543,7 +1539,7 @@ static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
> if (!unhash_ol_stateid(stp))
> return false;
> list_del_init(&stp->st_locks);
> - nfs4_unhash_stid(&stp->st_stid);
> + stp->st_stid.sc_status |= SC_STATUS_CLOSED;
> return true;
> }
>
> @@ -1622,6 +1618,7 @@ static void release_open_stateid(struct nfs4_ol_stateid *stp)
> LIST_HEAD(reaplist);
>
> spin_lock(&stp->st_stid.sc_client->cl_lock);
> + stp->st_stid.sc_status |= SC_STATUS_CLOSED;
> if (unhash_open_stateid(stp, &reaplist))
> put_ol_stateid_locked(stp, &reaplist);
> spin_unlock(&stp->st_stid.sc_client->cl_lock);
> @@ -2230,7 +2227,7 @@ __destroy_client(struct nfs4_client *clp)
> spin_lock(&state_lock);
> while (!list_empty(&clp->cl_delegations)) {
> dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
> - unhash_delegation_locked(dp, NFS4_CLOSED_DELEG_STID);
> + unhash_delegation_locked(dp, SC_STATUS_CLOSED);
> list_add(&dp->dl_recall_lru, &reaplist);
> }
> spin_unlock(&state_lock);
> @@ -2462,14 +2459,16 @@ find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
> }
>
> static struct nfs4_stid *
> -find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
> +find_stateid_by_type(struct nfs4_client *cl, stateid_t *t,
> + unsigned short typemask, unsigned short ok_states)
> {
> struct nfs4_stid *s;
>
> spin_lock(&cl->cl_lock);
> s = find_stateid_locked(cl, t);
> if (s != NULL) {
> - if (typemask & s->sc_type)
> + if ((s->sc_status & ~ok_states) == 0 &&
> + (typemask & s->sc_type))
> refcount_inc(&s->sc_count);
> else
> s = NULL;
> @@ -2622,7 +2621,7 @@ static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
> struct nfs4_stateowner *oo;
> unsigned int access, deny;
>
> - if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
> + if (st->sc_type != SC_TYPE_OPEN && st->sc_type != SC_TYPE_LOCK)
> return 0; /* XXX: or SEQ_SKIP? */
> ols = openlockstateid(st);
> oo = ols->st_stateowner;
> @@ -2754,13 +2753,13 @@ static int states_show(struct seq_file *s, void *v)
> struct nfs4_stid *st = v;
>
> switch (st->sc_type) {
> - case NFS4_OPEN_STID:
> + case SC_TYPE_OPEN:
> return nfs4_show_open(s, st);
> - case NFS4_LOCK_STID:
> + case SC_TYPE_LOCK:
> return nfs4_show_lock(s, st);
> - case NFS4_DELEG_STID:
> + case SC_TYPE_DELEG:
> return nfs4_show_deleg(s, st);
> - case NFS4_LAYOUT_STID:
> + case SC_TYPE_LAYOUT:
> return nfs4_show_layout(s, st);
> default:
> return 0; /* XXX: or SEQ_SKIP? */
> @@ -4532,7 +4531,8 @@ nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
> continue;
> if (local->st_stateowner != &oo->oo_owner)
> continue;
> - if (local->st_stid.sc_type == NFS4_OPEN_STID) {
> + if (local->st_stid.sc_type == SC_TYPE_OPEN &&
> + !local->st_stid.sc_status) {
> ret = local;
> refcount_inc(&ret->st_stid.sc_count);
> break;
> @@ -4546,17 +4546,10 @@ nfsd4_verify_open_stid(struct nfs4_stid *s)
> {
> __be32 ret = nfs_ok;
>
> - switch (s->sc_type) {
> - default:
> - break;
> - case 0:
> - case NFS4_CLOSED_STID:
> - case NFS4_CLOSED_DELEG_STID:
> - ret = nfserr_bad_stateid;
> - break;
> - case NFS4_REVOKED_DELEG_STID:
> + if (s->sc_status & SC_STATUS_REVOKED)
> ret = nfserr_deleg_revoked;
> - }
> + else if (s->sc_status & SC_STATUS_CLOSED)
> + ret = nfserr_bad_stateid;
> return ret;
> }
>
> @@ -4642,7 +4635,7 @@ init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
>
> open->op_stp = NULL;
> refcount_inc(&stp->st_stid.sc_count);
> - stp->st_stid.sc_type = NFS4_OPEN_STID;
> + stp->st_stid.sc_type = SC_TYPE_OPEN;
> INIT_LIST_HEAD(&stp->st_locks);
> stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
> get_nfs4_file(fp);
> @@ -4869,9 +4862,9 @@ static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
>
> trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
>
> - if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID ||
> - dp->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID)
> - return 1;
> + if (dp->dl_stid.sc_status)
> + /* CLOSED or REVOKED */
> + return 1;
>
> switch (task->tk_status) {
> case 0:
> @@ -5116,12 +5109,12 @@ static int share_access_to_flags(u32 share_access)
> return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
> }
>
> -static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
> +static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl,
> + stateid_t *s)
> {
> struct nfs4_stid *ret;
>
> - ret = find_stateid_by_type(cl, s,
> - NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
> + ret = find_stateid_by_type(cl, s, SC_TYPE_DELEG, SC_STATUS_REVOKED);
> if (!ret)
> return NULL;
> return delegstateid(ret);
> @@ -5144,7 +5137,7 @@ nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
> deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
> if (deleg == NULL)
> goto out;
> - if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
> + if (deleg->dl_stid.sc_status & SC_STATUS_REVOKED) {
> nfs4_put_stid(&deleg->dl_stid);
> status = nfserr_deleg_revoked;
> goto out;
> @@ -5777,7 +5770,6 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
> } else {
> status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
> if (status) {
> - stp->st_stid.sc_type = NFS4_CLOSED_STID;
> release_open_stateid(stp);
> mutex_unlock(&stp->st_mutex);
> goto out;
> @@ -6169,7 +6161,7 @@ nfs4_laundromat(struct nfsd_net *nn)
> dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
> if (!state_expired(&lt, dp->dl_time))
> break;
> - unhash_delegation_locked(dp, NFS4_REVOKED_DELEG_STID);
> + unhash_delegation_locked(dp, SC_STATUS_REVOKED);
> list_add(&dp->dl_recall_lru, &reaplist);
> }
> spin_unlock(&state_lock);
> @@ -6408,22 +6400,20 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
> status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
> if (status)
> goto out_unlock;
> + status = nfsd4_verify_open_stid(s);
> + if (status)
> + goto out_unlock;
> +
> switch (s->sc_type) {
> - case NFS4_DELEG_STID:
> + case SC_TYPE_DELEG:
> status = nfs_ok;
> break;
> - case NFS4_REVOKED_DELEG_STID:
> - status = nfserr_deleg_revoked;
> - break;
> - case NFS4_OPEN_STID:
> - case NFS4_LOCK_STID:
> + case SC_TYPE_OPEN:
> + case SC_TYPE_LOCK:
> status = nfsd4_check_openowner_confirmed(openlockstateid(s));
> break;
> default:
> printk("unknown stateid type %x\n", s->sc_type);
> - fallthrough;
> - case NFS4_CLOSED_STID:
> - case NFS4_CLOSED_DELEG_STID:
> status = nfserr_bad_stateid;
> }
> out_unlock:
> @@ -6433,7 +6423,8 @@ static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
>
> __be32
> nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
> - stateid_t *stateid, unsigned char typemask,
> + stateid_t *stateid,
> + unsigned short typemask, unsigned short statusmask,
> struct nfs4_stid **s, struct nfsd_net *nn)
> {
> __be32 status;
> @@ -6444,10 +6435,13 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
> * only return revoked delegations if explicitly asked.
> * otherwise we report revoked or bad_stateid status.
> */
> - if (typemask & NFS4_REVOKED_DELEG_STID)
> + if (statusmask & SC_STATUS_REVOKED)
> return_revoked = true;
> - else if (typemask & NFS4_DELEG_STID)
> - typemask |= NFS4_REVOKED_DELEG_STID;
> + if (typemask & SC_TYPE_DELEG)
> + /* Always allow REVOKED for DELEG so we can
> + * retturn the appropriate error.
> + */
> + statusmask |= SC_STATUS_REVOKED;
>
> if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
> CLOSE_STATEID(stateid))
> @@ -6460,14 +6454,12 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
> }
> if (status)
> return status;
> - stid = find_stateid_by_type(cstate->clp, stateid, typemask);
> + stid = find_stateid_by_type(cstate->clp, stateid, typemask, statusmask);
> if (!stid)
> return nfserr_bad_stateid;
> - if ((stid->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
> + if ((stid->sc_status & SC_STATUS_REVOKED) && !return_revoked) {
> nfs4_put_stid(stid);
> - if (cstate->minorversion)
> - return nfserr_deleg_revoked;
> - return nfserr_bad_stateid;
> + return nfserr_deleg_revoked;
> }
> *s = stid;
> return nfs_ok;
> @@ -6478,17 +6470,17 @@ nfs4_find_file(struct nfs4_stid *s, int flags)
> {
> struct nfsd_file *ret = NULL;
>
> - if (!s)
> + if (!s || s->sc_status)
> return NULL;
>
> switch (s->sc_type) {
> - case NFS4_DELEG_STID:
> + case SC_TYPE_DELEG:
> spin_lock(&s->sc_file->fi_lock);
> ret = nfsd_file_get(s->sc_file->fi_deleg_file);
> spin_unlock(&s->sc_file->fi_lock);
> break;
> - case NFS4_OPEN_STID:
> - case NFS4_LOCK_STID:
> + case SC_TYPE_OPEN:
> + case SC_TYPE_LOCK:
> if (flags & RD_STATE)
> ret = find_readable_file(s->sc_file);
> else
> @@ -6601,7 +6593,8 @@ static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
> goto out;
>
> *stid = find_stateid_by_type(found, &cps->cp_p_stateid,
> - NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID);
> + SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
> + 0);
> if (*stid)
> status = nfs_ok;
> else
> @@ -6658,8 +6651,8 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
> }
>
> status = nfsd4_lookup_stateid(cstate, stateid,
> - NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
> - &s, nn);
> + SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
> + 0, &s, nn);
> if (status == nfserr_bad_stateid)
> status = find_cpntf_state(nn, stateid, &s);
> if (status)
> @@ -6670,16 +6663,13 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
> goto out;
>
> switch (s->sc_type) {
> - case NFS4_DELEG_STID:
> + case SC_TYPE_DELEG:
> status = nfs4_check_delegmode(delegstateid(s), flags);
> break;
> - case NFS4_OPEN_STID:
> - case NFS4_LOCK_STID:
> + case SC_TYPE_OPEN:
> + case SC_TYPE_LOCK:
> status = nfs4_check_olstateid(openlockstateid(s), flags);
> break;
> - default:
> - status = nfserr_bad_stateid;
> - break;
> }
> if (status)
> goto out;
> @@ -6758,33 +6748,34 @@ nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
>
> spin_lock(&cl->cl_lock);
> s = find_stateid_locked(cl, stateid);
> - if (!s)
> + if (!s || s->sc_status & SC_STATUS_CLOSED)
> goto out_unlock;
> spin_lock(&s->sc_lock);
> switch (s->sc_type) {
> - case NFS4_DELEG_STID:
> + case SC_TYPE_DELEG:
> + if (s->sc_status & SC_STATUS_REVOKED) {
> + spin_unlock(&s->sc_lock);
> + dp = delegstateid(s);
> + list_del_init(&dp->dl_recall_lru);
> + spin_unlock(&cl->cl_lock);
> + nfs4_put_stid(s);
> + ret = nfs_ok;
> + goto out;
> + }
> ret = nfserr_locks_held;
> break;
> - case NFS4_OPEN_STID:
> + case SC_TYPE_OPEN:
> ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
> if (ret)
> break;
> ret = nfserr_locks_held;
> break;
> - case NFS4_LOCK_STID:
> + case SC_TYPE_LOCK:
> spin_unlock(&s->sc_lock);
> refcount_inc(&s->sc_count);
> spin_unlock(&cl->cl_lock);
> ret = nfsd4_free_lock_stateid(stateid, s);
> goto out;
> - case NFS4_REVOKED_DELEG_STID:
> - spin_unlock(&s->sc_lock);
> - dp = delegstateid(s);
> - list_del_init(&dp->dl_recall_lru);
> - spin_unlock(&cl->cl_lock);
> - nfs4_put_stid(s);
> - ret = nfs_ok;
> - goto out;
> /* Default falls through and returns nfserr_bad_stateid */
> }
> spin_unlock(&s->sc_lock);
> @@ -6827,6 +6818,7 @@ static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_
> * @seqid: seqid (provided by client)
> * @stateid: stateid (provided by client)
> * @typemask: mask of allowable types for this operation
> + * @statusmask: mask of allowed states: 0 or STID_CLOSED
> * @stpp: return pointer for the stateid found
> * @nn: net namespace for request
> *
> @@ -6836,7 +6828,8 @@ static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_
> */
> static __be32
> nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
> - stateid_t *stateid, char typemask,
> + stateid_t *stateid,
> + unsigned short typemask, unsigned short statusmask,
> struct nfs4_ol_stateid **stpp,
> struct nfsd_net *nn)
> {
> @@ -6847,7 +6840,8 @@ nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
> trace_nfsd_preprocess(seqid, stateid);
>
> *stpp = NULL;
> - status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
> + status = nfsd4_lookup_stateid(cstate, stateid,
> + typemask, statusmask, &s, nn);
> if (status)
> return status;
> stp = openlockstateid(s);
> @@ -6869,7 +6863,7 @@ static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cs
> struct nfs4_ol_stateid *stp;
>
> status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
> - NFS4_OPEN_STID, &stp, nn);
> + SC_TYPE_OPEN, 0, &stp, nn);
> if (status)
> return status;
> oo = openowner(stp->st_stateowner);
> @@ -6900,8 +6894,8 @@ nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> return status;
>
> status = nfs4_preprocess_seqid_op(cstate,
> - oc->oc_seqid, &oc->oc_req_stateid,
> - NFS4_OPEN_STID, &stp, nn);
> + oc->oc_seqid, &oc->oc_req_stateid,
> + SC_TYPE_OPEN, 0, &stp, nn);
> if (status)
> goto out;
> oo = openowner(stp->st_stateowner);
> @@ -7031,18 +7025,20 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> struct net *net = SVC_NET(rqstp);
> struct nfsd_net *nn = net_generic(net, nfsd_net_id);
>
> - dprintk("NFSD: nfsd4_close on file %pd\n",
> + dprintk("NFSD: nfsd4_close on file %pd\n",
> cstate->current_fh.fh_dentry);
>
> status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
> - &close->cl_stateid,
> - NFS4_OPEN_STID|NFS4_CLOSED_STID,
> - &stp, nn);
> + &close->cl_stateid,
> + SC_TYPE_OPEN, SC_STATUS_CLOSED,
> + &stp, nn);
> nfsd4_bump_seqid(cstate, status);
> if (status)
> - goto out;
> + goto out;
>
> - stp->st_stid.sc_type = NFS4_CLOSED_STID;
> + spin_lock(&stp->st_stid.sc_client->cl_lock);
> + stp->st_stid.sc_status |= SC_STATUS_CLOSED;
> + spin_unlock(&stp->st_stid.sc_client->cl_lock);
>
> /*
> * Technically we don't _really_ have to increment or copy it, since
> @@ -7084,7 +7080,7 @@ nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
> return status;
>
> - status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
> + status = nfsd4_lookup_stateid(cstate, stateid, SC_TYPE_DELEG, 0, &s, nn);
> if (status)
> goto out;
> dp = delegstateid(s);
> @@ -7351,7 +7347,7 @@ init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
> if (retstp)
> goto out_found;
> refcount_inc(&stp->st_stid.sc_count);
> - stp->st_stid.sc_type = NFS4_LOCK_STID;
> + stp->st_stid.sc_type = SC_TYPE_LOCK;
> stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
> get_nfs4_file(fp);
> stp->st_stid.sc_file = fp;
> @@ -7538,9 +7534,10 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> &lock_stp, &new);
> } else {
> status = nfs4_preprocess_seqid_op(cstate,
> - lock->lk_old_lock_seqid,
> - &lock->lk_old_lock_stateid,
> - NFS4_LOCK_STID, &lock_stp, nn);
> + lock->lk_old_lock_seqid,
> + &lock->lk_old_lock_stateid,
> + SC_TYPE_LOCK, 0, &lock_stp,
> + nn);
> }
> if (status)
> goto out;
> @@ -7853,8 +7850,8 @@ nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> return nfserr_inval;
>
> status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
> - &locku->lu_stateid, NFS4_LOCK_STID,
> - &stp, nn);
> + &locku->lu_stateid, SC_TYPE_LOCK, 0,
> + &stp, nn);
> if (status)
> goto out;
> nf = find_any_file(stp->st_stid.sc_file);
> @@ -8292,7 +8289,7 @@ nfs4_state_shutdown_net(struct net *net)
> spin_lock(&state_lock);
> list_for_each_safe(pos, next, &nn->del_recall_lru) {
> dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
> - unhash_delegation_locked(dp, NFS4_CLOSED_DELEG_STID);
> + unhash_delegation_locked(dp, SC_STATUS_CLOSED);
> list_add(&dp->dl_recall_lru, &reaplist);
> }
> spin_unlock(&state_lock);
> diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
> index 41bdc913fa71..ffc8920d0558 100644
> --- a/fs/nfsd/state.h
> +++ b/fs/nfsd/state.h
> @@ -88,17 +88,33 @@ struct nfsd4_callback_ops {
> */
> struct nfs4_stid {
> refcount_t sc_count;
> -#define NFS4_OPEN_STID 1
> -#define NFS4_LOCK_STID 2
> -#define NFS4_DELEG_STID 4
> -/* For an open stateid kept around *only* to process close replays: */
> -#define NFS4_CLOSED_STID 8
> +
> + /* A new stateid is added to the cl_stateids idr early before it
> + * is fully initialised. Its sc_type is then zero. After
> + * initialisation the sc_type it set under cl_lock, and then
> + * never changes.
> + */
> +#define SC_TYPE_OPEN BIT(0)
> +#define SC_TYPE_LOCK BIT(1)
> +#define SC_TYPE_DELEG BIT(2)
> +#define SC_TYPE_LAYOUT BIT(3)
> + unsigned short sc_type;
> +
> +/* state_lock protects sc_status for delegation stateids.
> + * ->cl_lock protects sc_status for open and lock stateids.
> + * ->st_mutex also protect sc_status for open stateids.
> + * ->ls_lock protects sc_status for layout stateids.
> + */
> +/*
> + * For an open stateid kept around *only* to process close replays.
> + * For deleg stateid, kept in idr until last reference is dropped.
> + */
> +#define SC_STATUS_CLOSED BIT(0)
> /* For a deleg stateid kept around only to process free_stateid's: */
> -#define NFS4_REVOKED_DELEG_STID 16
> -#define NFS4_CLOSED_DELEG_STID 32
> -#define NFS4_LAYOUT_STID 64
> +#define SC_STATUS_REVOKED BIT(1)
> + unsigned short sc_status;
> +
> struct list_head sc_cp_list;
> - unsigned char sc_type;
> stateid_t sc_stateid;
> spinlock_t sc_lock;
> struct nfs4_client *sc_client;
> @@ -672,15 +688,15 @@ extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
> stateid_t *stateid, int flags, struct nfsd_file **filp,
> struct nfs4_stid **cstid);
> __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
> - stateid_t *stateid, unsigned char typemask,
> - struct nfs4_stid **s, struct nfsd_net *nn);
> + stateid_t *stateid, unsigned short typemask,
> + unsigned short statusmask,
> + struct nfs4_stid **s, struct nfsd_net *nn);
> struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
> void (*sc_free)(struct nfs4_stid *));
> int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy);
> void nfs4_free_copy_state(struct nfsd4_copy *copy);
> struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
> struct nfs4_stid *p_stid);
> -void nfs4_unhash_stid(struct nfs4_stid *s);
> void nfs4_put_stid(struct nfs4_stid *s);
> void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
> void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
> diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
> index d1e8cf079b0f..fe08ca18b647 100644
> --- a/fs/nfsd/trace.h
> +++ b/fs/nfsd/trace.h
> @@ -641,23 +641,17 @@ DEFINE_EVENT(nfsd_stateseqid_class, nfsd_##name, \
> DEFINE_STATESEQID_EVENT(preprocess);
> DEFINE_STATESEQID_EVENT(open_confirm);
>
> -TRACE_DEFINE_ENUM(NFS4_OPEN_STID);
> -TRACE_DEFINE_ENUM(NFS4_LOCK_STID);
> -TRACE_DEFINE_ENUM(NFS4_DELEG_STID);
> -TRACE_DEFINE_ENUM(NFS4_CLOSED_STID);
> -TRACE_DEFINE_ENUM(NFS4_REVOKED_DELEG_STID);
> -TRACE_DEFINE_ENUM(NFS4_CLOSED_DELEG_STID);
> -TRACE_DEFINE_ENUM(NFS4_LAYOUT_STID);
> -
> #define show_stid_type(x) \
> __print_flags(x, "|", \
> - { NFS4_OPEN_STID, "OPEN" }, \
> - { NFS4_LOCK_STID, "LOCK" }, \
> - { NFS4_DELEG_STID, "DELEG" }, \
> - { NFS4_CLOSED_STID, "CLOSED" }, \
> - { NFS4_REVOKED_DELEG_STID, "REVOKED" }, \
> - { NFS4_CLOSED_DELEG_STID, "CLOSED_DELEG" }, \
> - { NFS4_LAYOUT_STID, "LAYOUT" })
> + { SC_TYPE_OPEN, "OPEN" }, \
> + { SC_TYPE_LOCK, "LOCK" }, \
> + { SC_TYPE_DELEG, "DELEG" }, \
> + { SC_TYPE_LAYOUT, "LAYOUT" })
> +
> +#define show_stid_status(x) \
> + __print_flags(x, "|", \
> + { SC_STATUS_CLOSED, "CLOSED" }, \
> + { SC_STATUS_REVOKED, "REVOKED" }) \
>
> DECLARE_EVENT_CLASS(nfsd_stid_class,
> TP_PROTO(
> @@ -666,6 +660,7 @@ DECLARE_EVENT_CLASS(nfsd_stid_class,
> TP_ARGS(stid),
> TP_STRUCT__entry(
> __field(unsigned long, sc_type)
> + __field(unsigned long, sc_status)
> __field(int, sc_count)
> __field(u32, cl_boot)
> __field(u32, cl_id)
> @@ -676,16 +671,18 @@ DECLARE_EVENT_CLASS(nfsd_stid_class,
> const stateid_t *stp = &stid->sc_stateid;
>
> __entry->sc_type = stid->sc_type;
> + __entry->sc_status = stid->sc_status;
> __entry->sc_count = refcount_read(&stid->sc_count);
> __entry->cl_boot = stp->si_opaque.so_clid.cl_boot;
> __entry->cl_id = stp->si_opaque.so_clid.cl_id;
> __entry->si_id = stp->si_opaque.so_id;
> __entry->si_generation = stp->si_generation;
> ),
> - TP_printk("client %08x:%08x stateid %08x:%08x ref=%d type=%s",
> + TP_printk("client %08x:%08x stateid %08x:%08x ref=%d type=%s state=%s",
> __entry->cl_boot, __entry->cl_id,
> __entry->si_id, __entry->si_generation,
> - __entry->sc_count, show_stid_type(__entry->sc_type)
> + __entry->sc_count, show_stid_type(__entry->sc_type),
> + show_stid_status(__entry->sc_status)
> )
> );
>
> --
> 2.43.0
>

--
Chuck Lever

2024-01-30 01:08:26

by NeilBrown

[permalink] [raw]

Subject: Re: [PATCH 13/13] nfsd: allow layout state to be admin-revoked.

On Mon, 29 Jan 2024, Jeff Layton wrote:
> On Mon, 2024-01-29 at 14:29 +1100, NeilBrown wrote:
> > When there is layout state on a filesystem that is being "unlocked" that
> > is now revoked, which involves closing the nfsd_file and releasing the
> > vfs lease.
> >
> > To avoid races, ->ls_file can now be accessed either:
> > - under ->fi_lock for the state's sc_file or
> > - under rcu_read_lock() if nfsd_file_get() is used.
> > To support this, ->fence_client and nfsd4_cb_layout_fail() now take a
> > second argument being the nfsd_file.
> >
> > Signed-off-by: NeilBrown <[email protected]>
> > ---
> > fs/nfsd/blocklayout.c | 4 ++--
> > fs/nfsd/nfs4layouts.c | 43 ++++++++++++++++++++++++++++++++-----------
> > fs/nfsd/nfs4state.c | 11 +++++++++--
> > fs/nfsd/pnfs.h | 8 +++++++-
> > 4 files changed, 50 insertions(+), 16 deletions(-)
> >
> > diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
> > index 46fd74d91ea9..3c040c81c77d 100644
> > --- a/fs/nfsd/blocklayout.c
> > +++ b/fs/nfsd/blocklayout.c
> > @@ -328,10 +328,10 @@ nfsd4_scsi_proc_layoutcommit(struct inode *inode,
> > }
> >
> > static void
> > -nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
> > +nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls, struct nfsd_file *file)
> > {
> > struct nfs4_client *clp = ls->ls_stid.sc_client;
> > - struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev;
> > + struct block_device *bdev = file->nf_file->f_path.mnt->mnt_sb->s_bdev;
> >
> > bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
> > nfsd4_scsi_pr_key(clp), 0, true);
> > diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c
> > index 857b822450b4..1cfd61db2472 100644
> > --- a/fs/nfsd/nfs4layouts.c
> > +++ b/fs/nfsd/nfs4layouts.c
> > @@ -152,6 +152,23 @@ void nfsd4_setup_layout_type(struct svc_export *exp)
> > #endif
> > }
> >
> > +void nfsd4_close_layout(struct nfs4_layout_stateid *ls)
> > +{
> > + struct nfsd_file *fl;
> > +
> > + spin_lock(&ls->ls_stid.sc_file->fi_lock);
> > + fl = ls->ls_file;
> > + ls->ls_file = NULL;
> > + spin_unlock(&ls->ls_stid.sc_file->fi_lock);
> > +
> > + if (fl) {
> > + if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
> > + vfs_setlease(fl->nf_file, F_UNLCK, NULL,
> > + (void **)&ls);
> > + nfsd_file_put(fl);
> > + }
> > +}
> > +
> > static void
> > nfsd4_free_layout_stateid(struct nfs4_stid *stid)
> > {
> > @@ -169,9 +186,7 @@ nfsd4_free_layout_stateid(struct nfs4_stid *stid)
> > list_del_init(&ls->ls_perfile);
> > spin_unlock(&fp->fi_lock);
> >
> > - if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
> > - vfs_setlease(ls->ls_file->nf_file, F_UNLCK, NULL, (void **)&ls);
> > - nfsd_file_put(ls->ls_file);
> > + nfsd4_close_layout(ls);
> >
> > if (ls->ls_recalled)
> > atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
> > @@ -605,7 +620,7 @@ nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
> > }
> >
> > static void
> > -nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
> > +nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls, struct nfsd_file *file)
> > {
> > struct nfs4_client *clp = ls->ls_stid.sc_client;
> > char addr_str[INET6_ADDRSTRLEN];
> > @@ -627,7 +642,7 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
> >
> > argv[0] = (char *)nfsd_recall_failed;
> > argv[1] = addr_str;
> > - argv[2] = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_id;
> > + argv[2] = file->nf_file->f_path.mnt->mnt_sb->s_id;
> > argv[3] = NULL;
> >
> > error = call_usermodehelper(nfsd_recall_failed, argv, envp,
> > @@ -657,6 +672,7 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
> > struct nfsd_net *nn;
> > ktime_t now, cutoff;
> > const struct nfsd4_layout_ops *ops;
> > + struct nfsd_file *fl;
> >
> > trace_nfsd_cb_layout_done(&ls->ls_stid.sc_stateid, task);
> > switch (task->tk_status) {
> > @@ -688,12 +704,17 @@ nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
> > * Unknown error or non-responding client, we'll need to fence.
> > */
> > trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid);
> > -
> > - ops = nfsd4_layout_ops[ls->ls_layout_type];
> > - if (ops->fence_client)
> > - ops->fence_client(ls);
> > - else
> > - nfsd4_cb_layout_fail(ls);
> > + rcu_read_lock();
> > + fl = nfsd_file_get(ls->ls_file);
> > + rcu_read_unlock();
>
> What is the rcu_read_lock protecting here? AFAICT, you don't need it
> since you hold a reference to "ls".

The new nfsd4_close_layout() can be called asynchronously (by admin
unlocking a filesystem) and will set ->ls_file to NULL, and then
nfsd_file_put() the file.
Without rcu_read_lock(), the pointer we get when dereferencing ls->ls_file
could have been passed to nfsd_file_put() and thence nfsd_file_free()
before nfsd_file_get() is called.
The rcu_read_lock() ensures that ->nf_ref from the pointer is still a valid
refcount and that it is safe for refcount_inc_not_zero() to be called on
it in nfsd_file_get().

Thanks for all you Reviewed-by!

NeilBrown

>
> > + if (fl) {
> > + ops = nfsd4_layout_ops[ls->ls_layout_type];
> > + if (ops->fence_client)
> > + ops->fence_client(ls, fl);
> > + else
> > + nfsd4_cb_layout_fail(ls, fl);
> > + nfsd_file_put(fl);
> > + }
> > return 1;
> > case -NFS4ERR_NOMATCHING_LAYOUT:
> > trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid);
> > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> > index e749d5c0e23a..268b47a6f3b6 100644
> > --- a/fs/nfsd/nfs4state.c
> > +++ b/fs/nfsd/nfs4state.c
> > @@ -1721,7 +1721,7 @@ void nfsd4_revoke_states(struct net *net, struct super_block *sb)
> > unsigned int idhashval;
> > unsigned int sc_types;
> >
> > - sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG;
> > + sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT;
> >
> > spin_lock(&nn->client_lock);
> > for (idhashval = 0; idhashval < CLIENT_HASH_MASK; idhashval++) {
> > @@ -1734,6 +1734,7 @@ void nfsd4_revoke_states(struct net *net, struct super_block *sb)
> > if (stid) {
> > struct nfs4_ol_stateid *stp;
> > struct nfs4_delegation *dp;
> > + struct nfs4_layout_stateid *ls;
> >
> > spin_unlock(&nn->client_lock);
> > switch (stid->sc_type) {
> > @@ -1789,6 +1790,10 @@ void nfsd4_revoke_states(struct net *net, struct super_block *sb)
> > if (dp)
> > revoke_delegation(dp);
> > break;
> > + case SC_TYPE_LAYOUT:
> > + ls = layoutstateid(stid);
> > + nfsd4_close_layout(ls);
> > + break;
> > }
> > nfs4_put_stid(stid);
> > spin_lock(&nn->client_lock);
> > @@ -2868,7 +2873,6 @@ static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
> > struct nfsd_file *file;
> >
> > ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
> > - file = ls->ls_file;
> >
> > seq_puts(s, "- ");
> > nfs4_show_stateid(s, &st->sc_stateid);
> > @@ -2876,12 +2880,15 @@ static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
> >
> > /* XXX: What else would be useful? */
> >
> > + spin_lock(&ls->ls_stid.sc_file->fi_lock);
> > + file = ls->ls_file;
> > if (file) {
> > seq_puts(s, ", ");
> > nfs4_show_superblock(s, file);
> > seq_puts(s, ", ");
> > nfs4_show_fname(s, file);
> > }
> > + spin_unlock(&ls->ls_stid.sc_file->fi_lock);
> > if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
> > seq_puts(s, ", admin-revoked");
> > seq_puts(s, " }\n");
> > diff --git a/fs/nfsd/pnfs.h b/fs/nfsd/pnfs.h
> > index de1e0dfed06a..925817f66917 100644
> > --- a/fs/nfsd/pnfs.h
> > +++ b/fs/nfsd/pnfs.h
> > @@ -37,7 +37,8 @@ struct nfsd4_layout_ops {
> > __be32 (*proc_layoutcommit)(struct inode *inode,
> > struct nfsd4_layoutcommit *lcp);
> >
> > - void (*fence_client)(struct nfs4_layout_stateid *ls);
> > + void (*fence_client)(struct nfs4_layout_stateid *ls,
> > + struct nfsd_file *file);
> > };
> >
> > extern const struct nfsd4_layout_ops *nfsd4_layout_ops[];
> > @@ -72,11 +73,13 @@ void nfsd4_setup_layout_type(struct svc_export *exp);
> > void nfsd4_return_all_client_layouts(struct nfs4_client *);
> > void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
> > struct nfs4_file *fp);
> > +void nfsd4_close_layout(struct nfs4_layout_stateid *ls);
> > int nfsd4_init_pnfs(void);
> > void nfsd4_exit_pnfs(void);
> > #else
> > struct nfs4_client;
> > struct nfs4_file;
> > +struct nfs4_layout_stateid;
> >
> > static inline void nfsd4_setup_layout_type(struct svc_export *exp)
> > {
> > @@ -89,6 +92,9 @@ static inline void nfsd4_return_all_file_layouts(struct nfs4_client *clp,
> > struct nfs4_file *fp)
> > {
> > }
> > +static inline void nfsd4_close_layout(struct nfs4_layout_stateid *ls)
> > +{
> > +}
> > static inline void nfsd4_exit_pnfs(void)
> > {
> > }
>
> --
> Jeff Layton <[email protected]>
>
>