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-rw-r--r--fs/pipe.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index b8997f8c6324..04629f36e397 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1199,6 +1199,18 @@ int pipe_proc_fn(struct ctl_table *table, int write, void __user *buf,
return ret;
}
+/*
+ * After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same
+ * location, so checking ->i_pipe is not enough to verify that this is a
+ * pipe.
+ */
+struct pipe_inode_info *get_pipe_info(struct file *file)
+{
+ struct inode *i = file->f_path.dentry->d_inode;
+
+ return S_ISFIFO(i->i_mode) ? i->i_pipe : NULL;
+}
+
long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct pipe_inode_info *pipe;