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OpenCloudOS-Kernel
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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>
This commit is contained in:
Trond Myklebust 2018-10-01 10:41:48 -04:00 committed by J. Bruce Fields
parent 9ceddd9da1
commit 6d1616b26c
1 changed files with 26 additions and 6 deletions
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32
net/sunrpc/auth_gss/svcauth_gss.c
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@ -76,6 +76,7 @@ struct rsi {
struct xdr_netobj in_handle, in_token;
struct xdr_netobj out_handle, out_token;
int major_status, minor_status;
struct rcu_head rcu_head;
};
static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
@ -89,11 +90,19 @@ static void rsi_free(struct rsi *rsii)
kfree(rsii->out_token.data);
}
static void rsi_free_rcu(struct rcu_head *head)
{
struct rsi *rsii = container_of(head, struct rsi, rcu_head);
rsi_free(rsii);
kfree(rsii);
}
static void rsi_put(struct kref *ref)
{
struct rsi *rsii = container_of(ref, struct rsi, h.ref);
rsi_free(rsii);
kfree(rsii);
call_rcu(&rsii->rcu_head, rsi_free_rcu);
}
static inline int rsi_hash(struct rsi *item)
@ -282,7 +291,7 @@ static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
struct cache_head *ch;
int hash = rsi_hash(item);
ch = sunrpc_cache_lookup(cd, &item->h, hash);
ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
if (ch)
return container_of(ch, struct rsi, h);
else
@ -330,6 +339,7 @@ struct rsc {
struct svc_cred cred;
struct gss_svc_seq_data seqdata;
struct gss_ctx *mechctx;
struct rcu_head rcu_head;
};
static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
@ -343,12 +353,22 @@ static void rsc_free(struct rsc *rsci)
free_svc_cred(&rsci->cred);
}
static void rsc_free_rcu(struct rcu_head *head)
{
struct rsc *rsci = container_of(head, struct rsc, rcu_head);
kfree(rsci->handle.data);
kfree(rsci);
}
static void rsc_put(struct kref *ref)
{
struct rsc *rsci = container_of(ref, struct rsc, h.ref);
rsc_free(rsci);
kfree(rsci);
if (rsci->mechctx)
gss_delete_sec_context(&rsci->mechctx);
free_svc_cred(&rsci->cred);
call_rcu(&rsci->rcu_head, rsc_free_rcu);
}
static inline int
@ -542,7 +562,7 @@ static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
struct cache_head *ch;
int hash = rsc_hash(item);
ch = sunrpc_cache_lookup(cd, &item->h, hash);
ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
if (ch)
return container_of(ch, struct rsc, h);
else