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-rw-r--r--net/sunrpc/rpc_pipe.c39
1 files changed, 26 insertions, 13 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index b67b2aecc4ff..ac9ee1590739 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -57,7 +57,7 @@ void rpc_pipefs_notifier_unregister(struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_unregister);
-static void rpc_purge_list(struct rpc_pipe *pipe, struct list_head *head,
+static void rpc_purge_list(wait_queue_head_t *waitq, struct list_head *head,
void (*destroy_msg)(struct rpc_pipe_msg *), int err)
{
struct rpc_pipe_msg *msg;
@@ -70,7 +70,7 @@ static void rpc_purge_list(struct rpc_pipe *pipe, struct list_head *head,
msg->errno = err;
destroy_msg(msg);
} while (!list_empty(head));
- wake_up(&pipe->waitq);
+ wake_up(waitq);
}
static void
@@ -80,6 +80,7 @@ rpc_timeout_upcall_queue(struct work_struct *work)
struct rpc_pipe *pipe =
container_of(work, struct rpc_pipe, queue_timeout.work);
void (*destroy_msg)(struct rpc_pipe_msg *);
+ struct dentry *dentry;
spin_lock(&pipe->lock);
destroy_msg = pipe->ops->destroy_msg;
@@ -87,8 +88,13 @@ rpc_timeout_upcall_queue(struct work_struct *work)
list_splice_init(&pipe->pipe, &free_list);
pipe->pipelen = 0;
}
+ dentry = dget(pipe->dentry);
spin_unlock(&pipe->lock);
- rpc_purge_list(pipe, &free_list, destroy_msg, -ETIMEDOUT);
+ if (dentry) {
+ rpc_purge_list(&RPC_I(dentry->d_inode)->waitq,
+ &free_list, destroy_msg, -ETIMEDOUT);
+ dput(dentry);
+ }
}
ssize_t rpc_pipe_generic_upcall(struct file *filp, struct rpc_pipe_msg *msg,
@@ -125,6 +131,7 @@ int
rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
{
int res = -EPIPE;
+ struct dentry *dentry;
spin_lock(&pipe->lock);
if (pipe->nreaders) {
@@ -140,8 +147,12 @@ rpc_queue_upcall(struct rpc_pipe *pipe, struct rpc_pipe_msg *msg)
pipe->pipelen += msg->len;
res = 0;
}
+ dentry = dget(pipe->dentry);
spin_unlock(&pipe->lock);
- wake_up(&pipe->waitq);
+ if (dentry) {
+ wake_up(&RPC_I(dentry->d_inode)->waitq);
+ dput(dentry);
+ }
return res;
}
EXPORT_SYMBOL_GPL(rpc_queue_upcall);
@@ -168,7 +179,7 @@ rpc_close_pipes(struct inode *inode)
pipe->pipelen = 0;
pipe->dentry = NULL;
spin_unlock(&pipe->lock);
- rpc_purge_list(pipe, &free_list, pipe->ops->destroy_msg, -EPIPE);
+ rpc_purge_list(&RPC_I(inode)->waitq, &free_list, pipe->ops->destroy_msg, -EPIPE);
pipe->nwriters = 0;
if (need_release && pipe->ops->release_pipe)
pipe->ops->release_pipe(inode);
@@ -257,7 +268,7 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
list_splice_init(&pipe->pipe, &free_list);
pipe->pipelen = 0;
spin_unlock(&pipe->lock);
- rpc_purge_list(pipe, &free_list,
+ rpc_purge_list(&RPC_I(inode)->waitq, &free_list,
pipe->ops->destroy_msg, -EAGAIN);
}
}
@@ -330,16 +341,18 @@ rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *of
static unsigned int
rpc_pipe_poll(struct file *filp, struct poll_table_struct *wait)
{
- struct rpc_pipe *pipe = RPC_I(filp->f_path.dentry->d_inode)->pipe;
- unsigned int mask = 0;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ struct rpc_inode *rpci = RPC_I(inode);
+ unsigned int mask = POLLOUT | POLLWRNORM;
- poll_wait(filp, &pipe->waitq, wait);
+ poll_wait(filp, &rpci->waitq, wait);
- mask = POLLOUT | POLLWRNORM;
- if (pipe->dentry == NULL)
+ mutex_lock(&inode->i_mutex);
+ if (rpci->pipe == NULL)
mask |= POLLERR | POLLHUP;
- if (filp->private_data || !list_empty(&pipe->pipe))
+ else if (filp->private_data || !list_empty(&rpci->pipe->pipe))
mask |= POLLIN | POLLRDNORM;
+ mutex_unlock(&inode->i_mutex);
return mask;
}
@@ -543,7 +556,6 @@ init_pipe(struct rpc_pipe *pipe)
INIT_LIST_HEAD(&pipe->in_downcall);
INIT_LIST_HEAD(&pipe->pipe);
pipe->pipelen = 0;
- init_waitqueue_head(&pipe->waitq);
INIT_DELAYED_WORK(&pipe->queue_timeout,
rpc_timeout_upcall_queue);
pipe->ops = NULL;
@@ -1165,6 +1177,7 @@ init_once(void *foo)
inode_init_once(&rpci->vfs_inode);
rpci->private = NULL;
rpci->pipe = NULL;
+ init_waitqueue_head(&rpci->waitq);
}
int register_rpc_pipefs(void)