nfsd: Always lock state exclusively.

It used to be the case that state had an rwlock that was locked for write
by downgrades, but for read for upgrades (opens). Well, the problem is
if there are two competing opens for the same state, they step on
each other toes potentially leading to leaking file descriptors
from the state structure, since access mode is a bitmap only set once.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f5f82e145018059bbeb265cd42a279a3009dfd6b..c927d36d8ac609f822b28c3b90a85ffdd8296ba8 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3502,7 +3502,7 @@ init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp,
        stp->st_access_bmap = 0;
        stp->st_deny_bmap = 0;
        stp->st_openstp = NULL;
-       init_rwsem(&stp->st_rwsem);
+       mutex_init(&stp->st_mutex);
        list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
        list_add(&stp->st_perfile, &fp->fi_stateids);
 
@@ -4335,10 +4335,10 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
         */
        if (stp) {
                /* Stateid was found, this is an OPEN upgrade */
-               down_read(&stp->st_rwsem);
+               mutex_lock(&stp->st_mutex);
                status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
                if (status) {
-                       up_read(&stp->st_rwsem);
+                       mutex_unlock(&stp->st_mutex);
                        goto out;
                }
        } else {
@@ -4348,19 +4348,19 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
                if (swapstp) {
                        nfs4_put_stid(&stp->st_stid);
                        stp = swapstp;
-                       down_read(&stp->st_rwsem);
+                       mutex_lock(&stp->st_mutex);
                        status = nfs4_upgrade_open(rqstp, fp, current_fh,
                                                stp, open);
                        if (status) {
-                               up_read(&stp->st_rwsem);
+                               mutex_unlock(&stp->st_mutex);
                                goto out;
                        }
                        goto upgrade_out;
                }
-               down_read(&stp->st_rwsem);
+               mutex_lock(&stp->st_mutex);
                status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
                if (status) {
-                       up_read(&stp->st_rwsem);
+                       mutex_unlock(&stp->st_mutex);
                        release_open_stateid(stp);
                        goto out;
                }
@@ -4372,7 +4372,7 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf
        }
 upgrade_out:
        nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
-       up_read(&stp->st_rwsem);
+       mutex_unlock(&stp->st_mutex);
 
        if (nfsd4_has_session(&resp->cstate)) {
                if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
@@ -4977,12 +4977,12 @@ static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_
                 * revoked delegations are kept only for free_stateid.
                 */
                return nfserr_bad_stateid;
-       down_write(&stp->st_rwsem);
+       mutex_lock(&stp->st_mutex);
        status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
        if (status == nfs_ok)
                status = nfs4_check_fh(current_fh, &stp->st_stid);
        if (status != nfs_ok)
-               up_write(&stp->st_rwsem);
+               mutex_unlock(&stp->st_mutex);
        return status;
 }
 
@@ -5030,7 +5030,7 @@ static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cs
                return status;
        oo = openowner(stp->st_stateowner);
        if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
-               up_write(&stp->st_rwsem);
+               mutex_unlock(&stp->st_mutex);
                nfs4_put_stid(&stp->st_stid);
                return nfserr_bad_stateid;
        }
@@ -5062,12 +5062,12 @@ nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
        oo = openowner(stp->st_stateowner);
        status = nfserr_bad_stateid;
        if (oo->oo_flags & NFS4_OO_CONFIRMED) {
-               up_write(&stp->st_rwsem);
+               mutex_unlock(&stp->st_mutex);
                goto put_stateid;
        }
        oo->oo_flags |= NFS4_OO_CONFIRMED;
        nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
-       up_write(&stp->st_rwsem);
+       mutex_unlock(&stp->st_mutex);
        dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
                __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
 
@@ -5143,7 +5143,7 @@ nfsd4_open_downgrade(struct svc_rqst *rqstp,
        nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
        status = nfs_ok;
 put_stateid:
-       up_write(&stp->st_rwsem);
+       mutex_unlock(&stp->st_mutex);
        nfs4_put_stid(&stp->st_stid);
 out:
        nfsd4_bump_seqid(cstate, status);
@@ -5196,7 +5196,7 @@ nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
        if (status)
                goto out; 
        nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
-       up_write(&stp->st_rwsem);
+       mutex_unlock(&stp->st_mutex);
 
        nfsd4_close_open_stateid(stp);
 
@@ -5422,7 +5422,7 @@ init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
        stp->st_access_bmap = 0;
        stp->st_deny_bmap = open_stp->st_deny_bmap;
        stp->st_openstp = open_stp;
-       init_rwsem(&stp->st_rwsem);
+       mutex_init(&stp->st_mutex);
        list_add(&stp->st_locks, &open_stp->st_locks);
        list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
        spin_lock(&fp->fi_lock);
@@ -5591,7 +5591,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                                        &open_stp, nn);
                if (status)
                        goto out;
-               up_write(&open_stp->st_rwsem);
+               mutex_unlock(&open_stp->st_mutex);
                open_sop = openowner(open_stp->st_stateowner);
                status = nfserr_bad_stateid;
                if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
@@ -5600,7 +5600,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
                status = lookup_or_create_lock_state(cstate, open_stp, lock,
                                                        &lock_stp, &new);
                if (status == nfs_ok)
-                       down_write(&lock_stp->st_rwsem);
+                       mutex_lock(&lock_stp->st_mutex);
        } else {
                status = nfs4_preprocess_seqid_op(cstate,
                                       lock->lk_old_lock_seqid,
@@ -5704,7 +5704,7 @@ out:
                    seqid_mutating_err(ntohl(status)))
                        lock_sop->lo_owner.so_seqid++;
 
-               up_write(&lock_stp->st_rwsem);
+               mutex_unlock(&lock_stp->st_mutex);
 
                /*
                 * If this is a new, never-before-used stateid, and we are
@@ -5874,7 +5874,7 @@ nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 fput:
        fput(filp);
 put_stateid:
-       up_write(&stp->st_rwsem);
+       mutex_unlock(&stp->st_mutex);
        nfs4_put_stid(&stp->st_stid);
 out:
        nfsd4_bump_seqid(cstate, status);

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 986e51e5ceac882f703e1d0262fdc66d356a453f..64053eadeb818f2a754bd791af7010b992e99d1a 100644 (file)
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -535,7 +535,7 @@ struct nfs4_ol_stateid {
        unsigned char                   st_access_bmap;
        unsigned char                   st_deny_bmap;
        struct nfs4_ol_stateid          *st_openstp;
-       struct rw_semaphore             st_rwsem;
+       struct mutex                    st_mutex;
 };
 
 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)