SUNRPC: Lockless server RPCSEC_GSS context lookup
Use RCU protection for looking up the RPCSEC_GSS context. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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Коммит
6d1616b26c
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@ -76,6 +76,7 @@ struct rsi {
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struct xdr_netobj in_handle, in_token;
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struct xdr_netobj out_handle, out_token;
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int major_status, minor_status;
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struct rcu_head rcu_head;
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};
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static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
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@ -89,11 +90,19 @@ static void rsi_free(struct rsi *rsii)
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kfree(rsii->out_token.data);
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}
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static void rsi_free_rcu(struct rcu_head *head)
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{
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struct rsi *rsii = container_of(head, struct rsi, rcu_head);
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rsi_free(rsii);
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kfree(rsii);
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}
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static void rsi_put(struct kref *ref)
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{
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struct rsi *rsii = container_of(ref, struct rsi, h.ref);
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rsi_free(rsii);
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kfree(rsii);
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call_rcu(&rsii->rcu_head, rsi_free_rcu);
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}
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static inline int rsi_hash(struct rsi *item)
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@ -282,7 +291,7 @@ static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
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struct cache_head *ch;
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int hash = rsi_hash(item);
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ch = sunrpc_cache_lookup(cd, &item->h, hash);
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ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
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if (ch)
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return container_of(ch, struct rsi, h);
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else
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@ -330,6 +339,7 @@ struct rsc {
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struct svc_cred cred;
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struct gss_svc_seq_data seqdata;
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struct gss_ctx *mechctx;
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struct rcu_head rcu_head;
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};
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static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
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@ -343,12 +353,22 @@ static void rsc_free(struct rsc *rsci)
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free_svc_cred(&rsci->cred);
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}
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static void rsc_free_rcu(struct rcu_head *head)
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{
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struct rsc *rsci = container_of(head, struct rsc, rcu_head);
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kfree(rsci->handle.data);
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kfree(rsci);
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}
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static void rsc_put(struct kref *ref)
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{
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struct rsc *rsci = container_of(ref, struct rsc, h.ref);
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rsc_free(rsci);
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kfree(rsci);
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if (rsci->mechctx)
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gss_delete_sec_context(&rsci->mechctx);
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free_svc_cred(&rsci->cred);
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call_rcu(&rsci->rcu_head, rsc_free_rcu);
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}
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static inline int
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@ -542,7 +562,7 @@ static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
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struct cache_head *ch;
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int hash = rsc_hash(item);
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ch = sunrpc_cache_lookup(cd, &item->h, hash);
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ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
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if (ch)
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return container_of(ch, struct rsc, h);
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else
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