Add a tiny procfs helper to splice a dentry that cannot be mounted upon.
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
---
fs/proc/internal.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index a8a8576d8592..9e3f25e4c188 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -349,3 +349,16 @@ static inline void pde_force_lookup(struct proc_dir_entry *pde)
/* /proc/net/ entries can be changed under us by setns(CLONE_NEWNET) */
pde->proc_dops = &proc_net_dentry_ops;
}
+
+/*
+ * Add a new procfs dentry that can't serve as a mountpoint. That should
+ * encompass anything that is ephemeral and can just disappear while the
+ * process is still around.
+ */
+static inline struct dentry *proc_splice_unmountable(struct inode *inode,
+ struct dentry *dentry, const struct dentry_operations *d_ops)
+{
+ d_set_d_op(dentry, d_ops);
+ dont_mount(dentry);
+ return d_splice_alias(inode, dentry);
+}
--
2.43.0
