SUNRPC: Convert gss_ctx_lock to an RCU lock
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
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f5c2187cfe
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5d28dc8207
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@ -75,6 +75,7 @@ struct gss_cl_ctx {
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struct xdr_netobj gc_wire_ctx;
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u32 gc_win;
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unsigned long gc_expiry;
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struct rcu_head gc_rcu;
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};
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struct gss_upcall_msg;
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@ -78,8 +78,6 @@ static const struct rpc_credops gss_credops;
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/* dump the buffer in `emacs-hexl' style */
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#define isprint(c) ((c > 0x1f) && (c < 0x7f))
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static DEFINE_RWLOCK(gss_ctx_lock);
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struct gss_auth {
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struct rpc_auth rpc_auth;
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struct gss_api_mech *mech;
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@ -88,7 +86,7 @@ struct gss_auth {
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struct dentry *dentry;
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};
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static void gss_destroy_ctx(struct gss_cl_ctx *);
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static void gss_free_ctx(struct gss_cl_ctx *);
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static struct rpc_pipe_ops gss_upcall_ops;
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static inline struct gss_cl_ctx *
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@ -102,20 +100,24 @@ static inline void
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gss_put_ctx(struct gss_cl_ctx *ctx)
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{
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if (atomic_dec_and_test(&ctx->count))
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gss_destroy_ctx(ctx);
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gss_free_ctx(ctx);
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}
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/* gss_cred_set_ctx:
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* called by gss_upcall_callback and gss_create_upcall in order
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* to set the gss context. The actual exchange of an old context
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* and a new one is protected by the inode->i_lock.
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*/
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static void
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gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
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{
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struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
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struct gss_cl_ctx *old;
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write_lock(&gss_ctx_lock);
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old = gss_cred->gc_ctx;
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gss_cred->gc_ctx = ctx;
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rcu_assign_pointer(gss_cred->gc_ctx, ctx);
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set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
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clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
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write_unlock(&gss_ctx_lock);
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if (old)
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gss_put_ctx(old);
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}
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@ -126,10 +128,10 @@ gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
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struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
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int res = 0;
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read_lock(&gss_ctx_lock);
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rcu_read_lock();
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if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx)
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res = 1;
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read_unlock(&gss_ctx_lock);
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rcu_read_unlock();
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return res;
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}
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@ -168,10 +170,10 @@ gss_cred_get_ctx(struct rpc_cred *cred)
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struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
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struct gss_cl_ctx *ctx = NULL;
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read_lock(&gss_ctx_lock);
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rcu_read_lock();
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if (gss_cred->gc_ctx)
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ctx = gss_get_ctx(gss_cred->gc_ctx);
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read_unlock(&gss_ctx_lock);
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rcu_read_unlock();
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return ctx;
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}
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@ -333,11 +335,11 @@ gss_upcall_callback(struct rpc_task *task)
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struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
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struct inode *inode = gss_msg->auth->dentry->d_inode;
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spin_lock(&inode->i_lock);
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if (gss_msg->ctx)
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gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
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else
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task->tk_status = gss_msg->msg.errno;
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spin_lock(&inode->i_lock);
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gss_cred->gc_upcall = NULL;
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rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
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spin_unlock(&inode->i_lock);
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@ -440,7 +442,6 @@ gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
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prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
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spin_lock(&inode->i_lock);
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if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
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spin_unlock(&inode->i_lock);
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break;
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}
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spin_unlock(&inode->i_lock);
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@ -454,6 +455,7 @@ gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
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gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
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else
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err = gss_msg->msg.errno;
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spin_unlock(&inode->i_lock);
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out_intr:
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finish_wait(&gss_msg->waitqueue, &wait);
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gss_release_msg(gss_msg);
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@ -681,9 +683,9 @@ gss_destroy(struct rpc_auth *auth)
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* to create a new cred or context, so they check that things have been
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* allocated before freeing them. */
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static void
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gss_destroy_ctx(struct gss_cl_ctx *ctx)
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gss_do_free_ctx(struct gss_cl_ctx *ctx)
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{
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dprintk("RPC: gss_destroy_ctx\n");
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dprintk("RPC: gss_free_ctx\n");
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if (ctx->gc_gss_ctx)
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gss_delete_sec_context(&ctx->gc_gss_ctx);
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@ -692,12 +694,23 @@ gss_destroy_ctx(struct gss_cl_ctx *ctx)
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kfree(ctx);
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}
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static void
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gss_free_ctx_callback(struct rcu_head *head)
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{
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struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
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gss_do_free_ctx(ctx);
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}
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static void
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gss_free_ctx(struct gss_cl_ctx *ctx)
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{
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call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
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}
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static void
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gss_free_cred(struct gss_cred *gss_cred)
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{
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dprintk("RPC: gss_free_cred %p\n", gss_cred);
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if (gss_cred->gc_ctx)
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gss_put_ctx(gss_cred->gc_ctx);
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kfree(gss_cred);
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}
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@ -711,7 +724,13 @@ gss_free_cred_callback(struct rcu_head *head)
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static void
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gss_destroy_cred(struct rpc_cred *cred)
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{
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struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
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struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
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rcu_assign_pointer(gss_cred->gc_ctx, NULL);
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call_rcu(&cred->cr_rcu, gss_free_cred_callback);
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if (ctx)
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gss_put_ctx(ctx);
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}
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/*
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