[PATCH 8/7] fs: free_write_pipe() fix

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

From: Ingo Molnar <mingo@elte.hu>

file_kill() has to look at the file's inode (for the barrier logic),
hence make sure we free the inode before the file.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 fs/pipe.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

Index: linux/fs/pipe.c
===================================================================
--- linux.orig/fs/pipe.c
+++ linux/fs/pipe.c
@@ -945,12 +945,17 @@ struct file *create_write_pipe(void)
 	return ERR_PTR(err);
 }
 
-void free_write_pipe(struct file *f)
+void free_write_pipe(struct file *file)
 {
-	free_pipe_info(f->f_dentry->d_inode);
-	dput(f->f_path.dentry);
-	mntput(f->f_path.mnt);
-	put_filp(f);
+	struct dentry *dentry = file->f_path.dentry;
+	struct vfsmount *mnt = file->f_path.mnt;
+
+	free_pipe_info(file->f_dentry->d_inode);
+	file->f_path.dentry = NULL;
+	file->f_path.mnt = NULL;
+	put_filp(file);
+	dput(dentry);
+	mntput(mnt);
 }
 
 struct file *create_read_pipe(struct file *wrf)