Commit 5bff0386 authored by Stanislav Kinsbursky's avatar Stanislav Kinsbursky Committed by Trond Myklebust
Browse files

SUNRPC: remove non-exclusive pipe creation from RPC pipefs 

This patch-set was created in context of clone of git branch:
git://git.linux-nfs.org/projects/trondmy/nfs-2.6.git

.

v2:
1) Rebased of current repo state (i.e. all commits were pulled before apply)

I feel it is ready for inclusion if no objections will appear.

SUNRPC pipefs non-exclusive pipe creation code looks obsolete. IOW, as I see
it, all pipes are creating with unique full path and only once.

Signed-off-by: default avatarStanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 62aa2b53

include/linux/sunrpc/rpc_pipe_fs.h

+0 −1
Original line number Diff line number Diff line
@@ -30,7 +30,6 @@ struct rpc_inode { 
	int pipelen;

	int nreaders;

	int nwriters;

	int nkern_readwriters;

	wait_queue_head_t waitq;

#define RPC_PIPE_WAIT_FOR_OPEN	1

	int flags;

net/sunrpc/rpc_pipe.c

+6 −38
Original line number Diff line number Diff line
@@ -554,7 +554,6 @@ static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry, 
	if (err)

		return err;

	rpci = RPC_I(dentry->d_inode);

	rpci->nkern_readwriters = 1;

	rpci->private = private;

	rpci->flags = flags;

	rpci->ops = ops;
@@ -587,16 +586,12 @@ static int __rpc_unlink(struct inode *dir, struct dentry *dentry) 
static int __rpc_rmpipe(struct inode *dir, struct dentry *dentry)

{

	struct inode *inode = dentry->d_inode;

	struct rpc_inode *rpci = RPC_I(inode);



	rpci->nkern_readwriters--;

	if (rpci->nkern_readwriters != 0)

		return 0;

	rpc_close_pipes(inode);

	return __rpc_unlink(dir, dentry);

}



static struct dentry *__rpc_lookup_create(struct dentry *parent,

static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,

					  struct qstr *name)

{

	struct dentry *dentry;
@@ -604,27 +599,13 @@ static struct dentry *__rpc_lookup_create(struct dentry *parent, 
	dentry = d_lookup(parent, name);

	if (!dentry) {

		dentry = d_alloc(parent, name);

		if (!dentry) {

			dentry = ERR_PTR(-ENOMEM);

			goto out_err;

		}

		if (!dentry)

			return ERR_PTR(-ENOMEM);

	}

	if (!dentry->d_inode)

	if (dentry->d_inode == NULL) {

		d_set_d_op(dentry, &rpc_dentry_operations);

out_err:

		return dentry;

	}



static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,

					  struct qstr *name)

{

	struct dentry *dentry;



	dentry = __rpc_lookup_create(parent, name);

	if (IS_ERR(dentry))

		return dentry;

	if (dentry->d_inode == NULL)

		return dentry;

	dput(dentry);

	return ERR_PTR(-EEXIST);

}
@@ -812,22 +793,9 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name, 
	q.hash = full_name_hash(q.name, q.len),



	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);

	dentry = __rpc_lookup_create(parent, &q);

	dentry = __rpc_lookup_create_exclusive(parent, &q);

	if (IS_ERR(dentry))

		goto out;

	if (dentry->d_inode) {

		struct rpc_inode *rpci = RPC_I(dentry->d_inode);

		if (rpci->private != private ||

				rpci->ops != ops ||

				rpci->flags != flags) {

			dput (dentry);

			err = -EBUSY;

			goto out_err;

		}

		rpci->nkern_readwriters++;

		goto out;

	}



	err = __rpc_mkpipe(dir, dentry, umode, &rpc_pipe_fops,

			   private, ops, flags);

	if (err)

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