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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>
This commit is contained in:
Trond Myklebust 2007-06-07 10:14:14 -04:00
parent 4a8c1344dc
commit b185f835e2
1 changed files with 25 additions and 22 deletions
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47
net/sunrpc/auth_gss/auth_gss.c
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@ -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;