linux-kernel - [RFC][PATCH 35/42] create_pipe_files(): switch the first allocation to alloc_file

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Message-Id: <20180711022206.12571-35-viro@ZenIV.linux.org.uk>
Date:   Wed, 11 Jul 2018 03:21:59 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: [RFC][PATCH 35/42] create_pipe_files(): switch the first allocation to alloc_file_pseudo()

From: Al Viro <viro@...iv.linux.org.uk>

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/pipe.c | 31 ++++++-------------------------
 1 file changed, 6 insertions(+), 25 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 9405e455f5b1..c8c4265bf87b 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -744,53 +744,34 @@ static struct inode * get_pipe_inode(void)
 
 int create_pipe_files(struct file **res, int flags)
 {
-	int err;
 	struct inode *inode = get_pipe_inode();
 	struct file *f;
-	struct path path;
 
 	if (!inode)
 		return -ENFILE;
 
-	err = -ENOMEM;
-	path.dentry = d_alloc_pseudo(pipe_mnt->mnt_sb, &empty_name);
-	if (!path.dentry)
-		goto err_inode;
-	path.mnt = mntget(pipe_mnt);
-
-	d_instantiate(path.dentry, inode);
-
-	f = alloc_file(&path, FMODE_WRITE, &pipefifo_fops);
+	f = alloc_file_pseudo(inode, pipe_mnt, "", FMODE_WRITE, &pipefifo_fops);
 	if (IS_ERR(f)) {
-		err = PTR_ERR(f);
-		goto err_dentry;
+		free_pipe_info(inode->i_pipe);
+		iput(inode);
+		return PTR_ERR(f);
 	}
 
 	f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT));
 	f->private_data = inode->i_pipe;
 
-	res[0] = alloc_file(&path, FMODE_READ, &pipefifo_fops);
+	res[0] = alloc_file(&f->f_path, FMODE_READ, &pipefifo_fops);
 	if (IS_ERR(res[0])) {
 		put_pipe_info(inode, inode->i_pipe);
 		fput(f);
 		return PTR_ERR(res[0]);
 	}
 
-	path_get(&path);
+	path_get(&f->f_path);
 	res[0]->private_data = inode->i_pipe;
 	res[0]->f_flags = O_RDONLY | (flags & O_NONBLOCK);
 	res[1] = f;
 	return 0;
-
-err_dentry:
-	free_pipe_info(inode->i_pipe);
-	path_put(&path);
-	return err;
-
-err_inode:
-	free_pipe_info(inode->i_pipe);
-	iput(inode);
-	return err;
 }
 
 static int __do_pipe_flags(int *fd, struct file **files, int flags)
-- 
2.11.0