diff options
| -rw-r--r-- | fs/nfsd/nfs4state.c | 96 |
1 files changed, 63 insertions, 33 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 9c7dcbb68094..879342bc16b2 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -983,6 +983,30 @@ static void nfs4_free_lock_stateid(struct nfs4_stid *stid) nfs4_free_ol_stateid(stid); } +/* + * Put the persistent reference to an already unhashed generic stateid, while + * holding the cl_lock. If it's the last reference, then put it onto the + * reaplist for later destruction. + */ +static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp, + struct list_head *reaplist) +{ + struct nfs4_stid *s = &stp->st_stid; + struct nfs4_client *clp = s->sc_client; + + lockdep_assert_held(&clp->cl_lock); + + WARN_ON_ONCE(!list_empty(&stp->st_locks)); + + if (!atomic_dec_and_test(&s->sc_count)) { + wake_up_all(&close_wq); + return; + } + + idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id); + list_add(&stp->st_locks, reaplist); +} + static void unhash_lock_stateid(struct nfs4_ol_stateid *stp) { struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner); @@ -1013,6 +1037,25 @@ static void unhash_lockowner_locked(struct nfs4_lockowner *lo) list_del_init(&lo->lo_owner.so_strhash); } +/* + * Free a list of generic stateids that were collected earlier after being + * fully unhashed. + */ +static void +free_ol_stateid_reaplist(struct list_head *reaplist) +{ + struct nfs4_ol_stateid *stp; + + might_sleep(); + + while (!list_empty(reaplist)) { + stp = list_first_entry(reaplist, struct nfs4_ol_stateid, + st_locks); + list_del(&stp->st_locks); + stp->st_stid.sc_free(&stp->st_stid); + } +} + static void release_lockowner(struct nfs4_lockowner *lo) { struct nfs4_client *clp = lo->lo_owner.so_client; @@ -1027,24 +1070,10 @@ static void release_lockowner(struct nfs4_lockowner *lo) stp = list_first_entry(&lo->lo_owner.so_stateids, struct nfs4_ol_stateid, st_perstateowner); unhash_lock_stateid(stp); - /* - * We now know that no new references can be added to the - * stateid. If ours is the last one, finish the unhashing - * and put it on the list to be reaped. - */ - if (atomic_dec_and_test(&stp->st_stid.sc_count)) { - idr_remove(&clp->cl_stateids, - stp->st_stid.sc_stateid.si_opaque.so_id); - list_add(&stp->st_locks, &reaplist); - } + put_ol_stateid_locked(stp, &reaplist); } spin_unlock(&clp->cl_lock); - while (!list_empty(&reaplist)) { - stp = list_first_entry(&reaplist, struct nfs4_ol_stateid, - st_locks); - list_del(&stp->st_locks); - stp->st_stid.sc_free(&stp->st_stid); - } + free_ol_stateid_reaplist(&reaplist); nfs4_put_stateowner(&lo->lo_owner); } @@ -1065,16 +1094,21 @@ static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp) static void unhash_open_stateid(struct nfs4_ol_stateid *stp) { - spin_lock(&stp->st_stateowner->so_client->cl_lock); + lockdep_assert_held(&stp->st_stid.sc_client->cl_lock); + unhash_generic_stateid(stp); release_open_stateid_locks(stp); - spin_unlock(&stp->st_stateowner->so_client->cl_lock); } static void release_open_stateid(struct nfs4_ol_stateid *stp) { + LIST_HEAD(reaplist); + + spin_lock(&stp->st_stid.sc_client->cl_lock); unhash_open_stateid(stp); - nfs4_put_stid(&stp->st_stid); + put_ol_stateid_locked(stp, &reaplist); + spin_unlock(&stp->st_stid.sc_client->cl_lock); + free_ol_stateid_reaplist(&reaplist); } static void unhash_openowner_locked(struct nfs4_openowner *oo) @@ -1098,30 +1132,24 @@ static void release_last_closed_stateid(struct nfs4_openowner *oo) } } -static void release_openowner_stateids(struct nfs4_openowner *oo) +static void release_openowner(struct nfs4_openowner *oo) { struct nfs4_ol_stateid *stp; struct nfs4_client *clp = oo->oo_owner.so_client; + struct list_head reaplist; - lockdep_assert_held(&clp->cl_lock); + INIT_LIST_HEAD(&reaplist); + spin_lock(&clp->cl_lock); + unhash_openowner_locked(oo); while (!list_empty(&oo->oo_owner.so_stateids)) { stp = list_first_entry(&oo->oo_owner.so_stateids, struct nfs4_ol_stateid, st_perstateowner); - spin_unlock(&clp->cl_lock); - release_open_stateid(stp); - spin_lock(&clp->cl_lock); + unhash_open_stateid(stp); + put_ol_stateid_locked(stp, &reaplist); } -} - -static void release_openowner(struct nfs4_openowner *oo) -{ - struct nfs4_client *clp = oo->oo_owner.so_client; - - spin_lock(&clp->cl_lock); - unhash_openowner_locked(oo); - release_openowner_stateids(oo); spin_unlock(&clp->cl_lock); + free_ol_stateid_reaplist(&reaplist); release_last_closed_stateid(oo); nfs4_put_stateowner(&oo->oo_owner); } @@ -4675,7 +4703,9 @@ static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s) struct nfs4_client *clp = s->st_stid.sc_client; s->st_stid.sc_type = NFS4_CLOSED_STID; + spin_lock(&clp->cl_lock); unhash_open_stateid(s); + spin_unlock(&clp->cl_lock); if (clp->cl_minorversion) nfs4_put_stid(&s->st_stid); |