1 files changed, 11 insertions, 0 deletions

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 475f9c597cb..756d3286bee 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -278,6 +278,17 @@ int autofs4_fill_super(struct super_block *, void *, int);
 struct autofs_info *autofs4_new_ino(struct autofs_sb_info *);
 void autofs4_clean_ino(struct autofs_info *);
 
+static inline int autofs_prepare_pipe(struct file *pipe)
+{
+        if (!pipe->f_op || !pipe->f_op->write)
+                return -EINVAL;
+        if (!S_ISFIFO(pipe->f_dentry->d_inode->i_mode))
+                return -EINVAL;
+        /* We want a packet pipe */
+        pipe->f_flags |= O_DIRECT;
+        return 0;
+}
+
 /* Queue management functions */
 
 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);