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Commit d0fe13ba authored by Stanislav Kinsbursky's avatar Stanislav Kinsbursky Committed by Trond Myklebust
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SUNRPC: cleanup PipeFS redundant RPC inode usage 



This patch removes redundant RPC inode references from PipeFS. These places are
actually where pipes operations are performed.

Signed-off-by: default avatarStanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent ba9e0975

net/sunrpc/rpc_pipe.c

+46 −47
Original line number Diff line number Diff line
@@ -132,28 +132,28 @@ EXPORT_SYMBOL_GPL(rpc_pipe_generic_upcall); 
int

rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)

{

	struct rpc_inode *rpci = RPC_I(inode);

	struct rpc_pipe *pipe = RPC_I(inode)->pipe;

	int res = -EPIPE;



	spin_lock(&rpci->pipe->lock);

	if (rpci->pipe->ops == NULL)

	spin_lock(&pipe->lock);

	if (pipe->ops == NULL)

		goto out;

	if (rpci->pipe->nreaders) {

		list_add_tail(&msg->list, &rpci->pipe->pipe);

		rpci->pipe->pipelen += msg->len;

	if (pipe->nreaders) {

		list_add_tail(&msg->list, &pipe->pipe);

		pipe->pipelen += msg->len;

		res = 0;

	} else if (rpci->pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {

		if (list_empty(&rpci->pipe->pipe))

	} else if (pipe->flags & RPC_PIPE_WAIT_FOR_OPEN) {

		if (list_empty(&pipe->pipe))

			queue_delayed_work(rpciod_workqueue,

					&rpci->pipe->queue_timeout,

					&pipe->queue_timeout,

					RPC_UPCALL_TIMEOUT);

		list_add_tail(&msg->list, &rpci->pipe->pipe);

		rpci->pipe->pipelen += msg->len;

		list_add_tail(&msg->list, &pipe->pipe);

		pipe->pipelen += msg->len;

		res = 0;

	}

out:

	spin_unlock(&rpci->pipe->lock);

	wake_up(&rpci->pipe->waitq);

	spin_unlock(&pipe->lock);

	wake_up(&pipe->waitq);

	return res;

}

EXPORT_SYMBOL_GPL(rpc_queue_upcall);
@@ -220,23 +220,23 @@ rpc_destroy_inode(struct inode *inode) 
static int

rpc_pipe_open(struct inode *inode, struct file *filp)

{

	struct rpc_inode *rpci = RPC_I(inode);

	struct rpc_pipe *pipe = RPC_I(inode)->pipe;

	int first_open;

	int res = -ENXIO;



	mutex_lock(&inode->i_mutex);

	if (rpci->pipe->ops == NULL)

	if (pipe->ops == NULL)

		goto out;

	first_open = rpci->pipe->nreaders == 0 && rpci->pipe->nwriters == 0;

	if (first_open && rpci->pipe->ops->open_pipe) {

		res = rpci->pipe->ops->open_pipe(inode);

	first_open = pipe->nreaders == 0 && pipe->nwriters == 0;

	if (first_open && pipe->ops->open_pipe) {

		res = pipe->ops->open_pipe(inode);

		if (res)

			goto out;

	}

	if (filp->f_mode & FMODE_READ)

		rpci->pipe->nreaders++;

		pipe->nreaders++;

	if (filp->f_mode & FMODE_WRITE)

		rpci->pipe->nwriters++;

		pipe->nwriters++;

	res = 0;

out:

	mutex_unlock(&inode->i_mutex);
@@ -287,39 +287,39 @@ static ssize_t 
rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)

{

	struct inode *inode = filp->f_path.dentry->d_inode;

	struct rpc_inode *rpci = RPC_I(inode);

	struct rpc_pipe *pipe = RPC_I(inode)->pipe;

	struct rpc_pipe_msg *msg;

	int res = 0;



	mutex_lock(&inode->i_mutex);

	if (rpci->pipe->ops == NULL) {

	if (pipe->ops == NULL) {

		res = -EPIPE;

		goto out_unlock;

	}

	msg = filp->private_data;

	if (msg == NULL) {

		spin_lock(&rpci->pipe->lock);

		if (!list_empty(&rpci->pipe->pipe)) {

			msg = list_entry(rpci->pipe->pipe.next,

		spin_lock(&pipe->lock);

		if (!list_empty(&pipe->pipe)) {

			msg = list_entry(pipe->pipe.next,

					struct rpc_pipe_msg,

					list);

			list_move(&msg->list, &rpci->pipe->in_upcall);

			rpci->pipe->pipelen -= msg->len;

			list_move(&msg->list, &pipe->in_upcall);

			pipe->pipelen -= msg->len;

			filp->private_data = msg;

			msg->copied = 0;

		}

		spin_unlock(&rpci->pipe->lock);

		spin_unlock(&pipe->lock);

		if (msg == NULL)

			goto out_unlock;

	}

	/* NOTE: it is up to the callback to update msg->copied */

	res = rpci->pipe->ops->upcall(filp, msg, buf, len);

	res = pipe->ops->upcall(filp, msg, buf, len);

	if (res < 0 || msg->len == msg->copied) {

		filp->private_data = NULL;

		spin_lock(&rpci->pipe->lock);

		spin_lock(&pipe->lock);

		list_del_init(&msg->list);

		spin_unlock(&rpci->pipe->lock);

		rpci->pipe->ops->destroy_msg(msg);

		spin_unlock(&pipe->lock);

		pipe->ops->destroy_msg(msg);

	}

out_unlock:

	mutex_unlock(&inode->i_mutex);
@@ -330,13 +330,13 @@ static ssize_t 
rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *offset)

{

	struct inode *inode = filp->f_path.dentry->d_inode;

	struct rpc_inode *rpci = RPC_I(inode);

	struct rpc_pipe *pipe = RPC_I(inode)->pipe;

	int res;



	mutex_lock(&inode->i_mutex);

	res = -EPIPE;

	if (rpci->pipe->ops != NULL)

		res = rpci->pipe->ops->downcall(filp, buf, len);

	if (pipe->ops != NULL)

		res = pipe->ops->downcall(filp, buf, len);

	mutex_unlock(&inode->i_mutex);

	return res;

}
@@ -344,16 +344,15 @@ 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_inode *rpci;

	struct rpc_pipe *pipe = RPC_I(filp->f_path.dentry->d_inode)->pipe;

	unsigned int mask = 0;



	rpci = RPC_I(filp->f_path.dentry->d_inode);

	poll_wait(filp, &rpci->pipe->waitq, wait);

	poll_wait(filp, &pipe->waitq, wait);



	mask = POLLOUT | POLLWRNORM;

	if (rpci->pipe->ops == NULL)

	if (pipe->ops == NULL)

		mask |= POLLERR | POLLHUP;

	if (filp->private_data || !list_empty(&rpci->pipe->pipe))

	if (filp->private_data || !list_empty(&pipe->pipe))

		mask |= POLLIN | POLLRDNORM;

	return mask;

}
@@ -362,23 +361,23 @@ static long 
rpc_pipe_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	struct inode *inode = filp->f_path.dentry->d_inode;

	struct rpc_inode *rpci = RPC_I(inode);

	struct rpc_pipe *pipe = RPC_I(inode)->pipe;

	int len;



	switch (cmd) {

	case FIONREAD:

		spin_lock(&rpci->pipe->lock);

		if (rpci->pipe->ops == NULL) {

			spin_unlock(&rpci->pipe->lock);

		spin_lock(&pipe->lock);

		if (pipe->ops == NULL) {

			spin_unlock(&pipe->lock);

			return -EPIPE;

		}

		len = rpci->pipe->pipelen;

		len = pipe->pipelen;

		if (filp->private_data) {

			struct rpc_pipe_msg *msg;

			msg = filp->private_data;

			len += msg->len - msg->copied;

		}

		spin_unlock(&rpci->pipe->lock);

		spin_unlock(&pipe->lock);

		return put_user(len, (int __user *)arg);

	default:

		return -EINVAL;
@@ -808,7 +807,7 @@ static int rpc_rmdir_depopulate(struct dentry *dentry, 
 * @private: private data to associate with the pipe, for the caller's use

 * @ops: operations defining the behavior of the pipe: upcall, downcall,

 *	release_pipe, open_pipe, and destroy_msg.

 * @flags: rpc_inode flags

 * @flags: rpc_pipe flags

 *

 * Data is made available for userspace to read by calls to

 * rpc_queue_upcall().  The actual reads will result in calls to