SUNRPC: Remove the gss_auth spinlock

We're just as well off using the inode spinlock instead.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index e894e2fc360d28a2cb37cd6206a14cd3802e0b02..653d712a1ffb85e0226220c8ba619a94e00cc85b 100644 (file)
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -88,7 +88,6 @@ struct gss_auth {
        struct list_head upcalls;
        struct rpc_clnt *client;
        struct dentry *dentry;
-       spinlock_t lock;
 };
 
 static void gss_destroy_ctx(struct gss_cl_ctx *);
@@ -290,16 +289,17 @@ __gss_find_upcall(struct gss_auth *gss_auth, uid_t uid)
 static inline struct gss_upcall_msg *
 gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
 {
+       struct inode *inode = gss_auth->dentry->d_inode;
        struct gss_upcall_msg *old;
 
-       spin_lock(&gss_auth->lock);
+       spin_lock(&inode->i_lock);
        old = __gss_find_upcall(gss_auth, gss_msg->uid);
        if (old == NULL) {
                atomic_inc(&gss_msg->count);
                list_add(&gss_msg->list, &gss_auth->upcalls);
        } else
                gss_msg = old;
-       spin_unlock(&gss_auth->lock);
+       spin_unlock(&inode->i_lock);
        return gss_msg;
 }
 
@@ -318,10 +318,11 @@ static void
 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
 {
        struct gss_auth *gss_auth = gss_msg->auth;
+       struct inode *inode = gss_auth->dentry->d_inode;
 
-       spin_lock(&gss_auth->lock);
+       spin_lock(&inode->i_lock);
        __gss_unhash_msg(gss_msg);
-       spin_unlock(&gss_auth->lock);
+       spin_unlock(&inode->i_lock);
 }
 
 static void
@@ -330,16 +331,16 @@ gss_upcall_callback(struct rpc_task *task)
        struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
                        struct gss_cred, gc_base);
        struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
+       struct inode *inode = gss_msg->auth->dentry->d_inode;
 
-       BUG_ON(gss_msg == NULL);
        if (gss_msg->ctx)
                gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
        else
                task->tk_status = gss_msg->msg.errno;
-       spin_lock(&gss_msg->auth->lock);
+       spin_lock(&inode->i_lock);
        gss_cred->gc_upcall = NULL;
        rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
-       spin_unlock(&gss_msg->auth->lock);
+       spin_unlock(&inode->i_lock);
        gss_release_msg(gss_msg);
 }
 
@@ -391,6 +392,7 @@ gss_refresh_upcall(struct rpc_task *task)
        struct gss_cred *gss_cred = container_of(cred,
                        struct gss_cred, gc_base);
        struct gss_upcall_msg *gss_msg;
+       struct inode *inode = gss_auth->dentry->d_inode;
        int err = 0;
 
        dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid,
@@ -400,7 +402,7 @@ gss_refresh_upcall(struct rpc_task *task)
                err = PTR_ERR(gss_msg);
                goto out;
        }
-       spin_lock(&gss_auth->lock);
+       spin_lock(&inode->i_lock);
        if (gss_cred->gc_upcall != NULL)
                rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
        else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
@@ -411,7 +413,7 @@ gss_refresh_upcall(struct rpc_task *task)
                rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
        } else
                err = gss_msg->msg.errno;
-       spin_unlock(&gss_auth->lock);
+       spin_unlock(&inode->i_lock);
        gss_release_msg(gss_msg);
 out:
        dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n",
@@ -422,6 +424,7 @@ out:
 static inline int
 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
 {
+       struct inode *inode = gss_auth->dentry->d_inode;
        struct rpc_cred *cred = &gss_cred->gc_base;
        struct gss_upcall_msg *gss_msg;
        DEFINE_WAIT(wait);
@@ -435,12 +438,12 @@ gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
        }
        for (;;) {
                prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
-               spin_lock(&gss_auth->lock);
+               spin_lock(&inode->i_lock);
                if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
-                       spin_unlock(&gss_auth->lock);
+                       spin_unlock(&inode->i_lock);
                        break;
                }
-               spin_unlock(&gss_auth->lock);
+               spin_unlock(&inode->i_lock);
                if (signalled()) {
                        err = -ERESTARTSYS;
                        goto out_intr;
@@ -492,6 +495,7 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
        struct gss_auth *gss_auth;
        struct rpc_cred *cred;
        struct gss_upcall_msg *gss_msg;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        struct gss_cl_ctx *ctx;
        uid_t uid;
        int err = -EFBIG;
@@ -503,7 +507,7 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
        if (!buf)
                goto out;
 
-       clnt = RPC_I(filp->f_path.dentry->d_inode)->private;
+       clnt = RPC_I(inode)->private;
        err = -EFAULT;
        if (copy_from_user(buf, src, mlen))
                goto err;
@@ -527,18 +531,18 @@ gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
                if (err != -EACCES)
                        goto err_put_ctx;
        }
-       spin_lock(&gss_auth->lock);
+       spin_lock(&inode->i_lock);
        gss_msg = __gss_find_upcall(gss_auth, uid);
        if (gss_msg) {
                if (err == 0 && gss_msg->ctx == NULL)
                        gss_msg->ctx = gss_get_ctx(ctx);
                gss_msg->msg.errno = err;
                __gss_unhash_msg(gss_msg);
-               spin_unlock(&gss_auth->lock);
+               spin_unlock(&inode->i_lock);
                gss_release_msg(gss_msg);
        } else {
                struct auth_cred acred = { .uid = uid };
-               spin_unlock(&gss_auth->lock);
+               spin_unlock(&inode->i_lock);
                cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, RPCAUTH_LOOKUP_NEW);
                if (IS_ERR(cred)) {
                        err = PTR_ERR(cred);
@@ -570,7 +574,7 @@ gss_pipe_release(struct inode *inode)
        clnt = rpci->private;
        auth = clnt->cl_auth;
        gss_auth = container_of(auth, struct gss_auth, rpc_auth);
-       spin_lock(&gss_auth->lock);
+       spin_lock(&inode->i_lock);
        while (!list_empty(&gss_auth->upcalls)) {
                struct gss_upcall_msg *gss_msg;
 
@@ -579,11 +583,11 @@ gss_pipe_release(struct inode *inode)
                gss_msg->msg.errno = -EPIPE;
                atomic_inc(&gss_msg->count);
                __gss_unhash_msg(gss_msg);
-               spin_unlock(&gss_auth->lock);
+               spin_unlock(&inode->i_lock);
                gss_release_msg(gss_msg);
-               spin_lock(&gss_auth->lock);
+               spin_lock(&inode->i_lock);
        }
-       spin_unlock(&gss_auth->lock);
+       spin_unlock(&inode->i_lock);
 }
 
 static void
@@ -638,7 +642,6 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
        if (gss_auth->service == 0)
                goto err_put_mech;
        INIT_LIST_HEAD(&gss_auth->upcalls);
-       spin_lock_init(&gss_auth->lock);
        auth = &gss_auth->rpc_auth;
        auth->au_cslack = GSS_CRED_SLACK >> 2;
        auth->au_rslack = GSS_VERF_SLACK >> 2;