mirror of https://gitee.com/openkylin/linux.git
nfsd: Add reference counting to the lock and open stateids
When we remove the client_mutex, we'll need to be able to ensure that these objects aren't destroyed while we're not holding locks. Add a ->free() callback to the struct nfs4_stid, so that we can release a reference to the stid without caring about the contents. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust
J. Bruce Fields
parent
b3fbfe0e7a
commit
6011695da2
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@ -905,7 +905,7 @@ static void nfsd4_cb_recall_release(void *calldata)
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spin_lock(&clp->cl_lock);
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list_del(&cb->cb_per_client);
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spin_unlock(&clp->cl_lock);
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nfs4_put_delegation(dp);
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nfs4_put_stid(&dp->dl_stid);
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}
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}
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@ -71,6 +71,7 @@ static u64 current_sessionid = 1;
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/* forward declarations */
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static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
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static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
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/* Locking: */
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@ -463,8 +464,8 @@ static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
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__nfs4_file_put_access(fp, O_RDONLY);
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}
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static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
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kmem_cache *slab)
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static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl,
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struct kmem_cache *slab)
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{
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struct idr *stateids = &cl->cl_stateids;
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struct nfs4_stid *stid;
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@ -500,7 +501,26 @@ kmem_cache *slab)
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static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
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{
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return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
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struct nfs4_stid *stid;
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struct nfs4_ol_stateid *stp;
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stid = nfs4_alloc_stid(clp, stateid_slab);
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if (!stid)
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return NULL;
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stp = openlockstateid(stid);
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stp->st_stid.sc_free = nfs4_free_ol_stateid;
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return stp;
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}
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static void nfs4_free_deleg(struct nfs4_stid *stid)
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{
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struct nfs4_delegation *dp = delegstateid(stid);
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if (dp->dl_file)
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put_nfs4_file(dp->dl_file);
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kmem_cache_free(deleg_slab, stid);
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atomic_long_dec(&num_delegations);
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}
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/*
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@ -594,6 +614,8 @@ alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh)
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dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
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if (dp == NULL)
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goto out_dec;
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dp->dl_stid.sc_free = nfs4_free_deleg;
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/*
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* delegation seqid's are never incremented. The 4.1 special
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* meaning of seqid 0 isn't meaningful, really, but let's avoid
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@ -611,28 +633,15 @@ alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh)
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return NULL;
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}
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static void remove_stid(struct nfs4_stid *s)
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{
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struct idr *stateids = &s->sc_client->cl_stateids;
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idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
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}
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static void nfs4_free_stid(struct kmem_cache *slab, struct nfs4_stid *s)
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{
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kmem_cache_free(slab, s);
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}
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void
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nfs4_put_delegation(struct nfs4_delegation *dp)
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nfs4_put_stid(struct nfs4_stid *s)
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{
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if (atomic_dec_and_test(&dp->dl_stid.sc_count)) {
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if (dp->dl_file)
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put_nfs4_file(dp->dl_file);
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remove_stid(&dp->dl_stid);
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nfs4_free_stid(deleg_slab, &dp->dl_stid);
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atomic_long_dec(&num_delegations);
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}
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struct nfs4_client *clp = s->sc_client;
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if (!atomic_dec_and_test(&s->sc_count))
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return;
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idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
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s->sc_free(s);
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}
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static void nfs4_put_deleg_lease(struct nfs4_file *fp)
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@ -689,7 +698,7 @@ static void destroy_delegation(struct nfs4_delegation *dp)
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spin_lock(&state_lock);
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unhash_delegation_locked(dp);
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spin_unlock(&state_lock);
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nfs4_put_delegation(dp);
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nfs4_put_stid(&dp->dl_stid);
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}
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static void revoke_delegation(struct nfs4_delegation *dp)
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@ -699,7 +708,7 @@ static void revoke_delegation(struct nfs4_delegation *dp)
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WARN_ON(!list_empty(&dp->dl_recall_lru));
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if (clp->cl_minorversion == 0)
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nfs4_put_delegation(dp);
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nfs4_put_stid(&dp->dl_stid);
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else {
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dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
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spin_lock(&clp->cl_lock);
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@ -885,17 +894,14 @@ static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
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list_del(&stp->st_perstateowner);
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}
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static void close_generic_stateid(struct nfs4_ol_stateid *stp)
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static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
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{
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release_all_access(stp);
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}
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struct nfs4_ol_stateid *stp = openlockstateid(stid);
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static void free_generic_stateid(struct nfs4_ol_stateid *stp)
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{
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release_all_access(stp);
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if (stp->st_file)
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put_nfs4_file(stp->st_file);
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remove_stid(&stp->st_stid);
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nfs4_free_stid(stateid_slab, &stp->st_stid);
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kmem_cache_free(stateid_slab, stid);
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}
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static void __release_lock_stateid(struct nfs4_ol_stateid *stp)
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@ -908,8 +914,7 @@ static void __release_lock_stateid(struct nfs4_ol_stateid *stp)
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file = find_any_file(stp->st_file);
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if (file)
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filp_close(file, (fl_owner_t)lockowner(stp->st_stateowner));
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close_generic_stateid(stp);
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free_generic_stateid(stp);
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nfs4_put_stid(&stp->st_stid);
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}
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static void unhash_lockowner(struct nfs4_lockowner *lo)
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@ -966,13 +971,12 @@ static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
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{
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unhash_generic_stateid(stp);
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release_open_stateid_locks(stp);
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close_generic_stateid(stp);
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}
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static void release_open_stateid(struct nfs4_ol_stateid *stp)
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{
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unhash_open_stateid(stp);
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free_generic_stateid(stp);
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nfs4_put_stid(&stp->st_stid);
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}
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static void unhash_openowner(struct nfs4_openowner *oo)
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@ -993,7 +997,7 @@ static void release_last_closed_stateid(struct nfs4_openowner *oo)
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struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
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if (s) {
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free_generic_stateid(s);
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nfs4_put_stid(&s->st_stid);
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oo->oo_last_closed_stid = NULL;
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}
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}
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@ -1467,12 +1471,12 @@ destroy_client(struct nfs4_client *clp)
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while (!list_empty(&reaplist)) {
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dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
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list_del_init(&dp->dl_recall_lru);
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nfs4_put_delegation(dp);
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nfs4_put_stid(&dp->dl_stid);
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}
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while (!list_empty(&clp->cl_revoked)) {
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dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
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list_del_init(&dp->dl_recall_lru);
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nfs4_put_delegation(dp);
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nfs4_put_stid(&dp->dl_stid);
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}
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while (!list_empty(&clp->cl_openowners)) {
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oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
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@ -3588,7 +3592,7 @@ nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
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spin_unlock(&state_lock);
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out:
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if (status) {
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nfs4_put_delegation(dp);
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nfs4_put_stid(&dp->dl_stid);
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return ERR_PTR(status);
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}
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return dp;
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@ -3818,7 +3822,7 @@ void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
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if (open->op_file)
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nfsd4_free_file(open->op_file);
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if (open->op_stp)
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free_generic_stateid(open->op_stp);
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nfs4_put_stid(&open->op_stp->st_stid);
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}
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__be32
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@ -4266,7 +4270,7 @@ nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
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spin_lock(&cl->cl_lock);
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list_del_init(&dp->dl_recall_lru);
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spin_unlock(&cl->cl_lock);
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nfs4_put_delegation(dp);
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nfs4_put_stid(s);
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ret = nfs_ok;
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break;
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default:
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@ -4477,19 +4481,22 @@ static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
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unhash_open_stateid(s);
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if (clp->cl_minorversion) {
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free_generic_stateid(s);
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if (list_empty(&oo->oo_owner.so_stateids))
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release_openowner(oo);
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nfs4_put_stid(&s->st_stid);
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} else {
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/*
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* In the 4.0 case we need to keep the owners around a
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* little while to handle CLOSE replay. We still do need
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* to release any file access that is held by them
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* before returning however.
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*/
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release_all_access(s);
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if (s->st_file) {
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put_nfs4_file(s->st_file);
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s->st_file = NULL;
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}
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oo->oo_last_closed_stid = s;
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/*
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* In the 4.0 case we need to keep the owners around a
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* little while to handle CLOSE replay.
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*/
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if (list_empty(&oo->oo_owner.so_stateids))
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move_to_close_lru(oo, clp->net);
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}
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@ -5665,7 +5672,7 @@ nfs4_state_shutdown_net(struct net *net)
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list_for_each_safe(pos, next, &reaplist) {
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dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
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list_del_init(&dp->dl_recall_lru);
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nfs4_put_delegation(dp);
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nfs4_put_stid(&dp->dl_stid);
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}
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nfsd4_client_tracking_exit(net);
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@ -85,6 +85,7 @@ struct nfs4_stid {
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unsigned char sc_type;
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stateid_t sc_stateid;
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struct nfs4_client *sc_client;
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void (*sc_free)(struct nfs4_stid *);
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};
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struct nfs4_delegation {
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@ -429,6 +430,7 @@ extern __be32 nfs4_preprocess_stateid_op(struct net *net,
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stateid_t *stateid, int flags, struct file **filp);
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extern void nfs4_lock_state(void);
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extern void nfs4_unlock_state(void);
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void nfs4_put_stid(struct nfs4_stid *s);
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void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
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extern void nfs4_release_reclaim(struct nfsd_net *);
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extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir,
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@ -446,7 +448,6 @@ extern int nfsd4_create_callback_queue(void);
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extern void nfsd4_destroy_callback_queue(void);
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extern void nfsd4_shutdown_callback(struct nfs4_client *);
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extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
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extern void nfs4_put_delegation(struct nfs4_delegation *dp);
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extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
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struct nfsd_net *nn);
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extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
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