[PATCH] Documentation: document d_prune op in vfs.txt

[Jeff Layton <jlayton@kernel.org>]

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 Documentation/filesystems/vfs.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 761c6fd24a53..4f1638e5f95b 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -1013,6 +1013,7 @@ struct dentry_operations {
 	int (*d_delete)(const struct dentry *);
 	int (*d_init)(struct dentry *);
 	void (*d_release)(struct dentry *);
+	void (*d_prune)(struct dentry *);
 	void (*d_iput)(struct dentry *, struct inode *);
 	char *(*d_dname)(struct dentry *, char *, int);
 	struct vfsmount *(*d_automount)(struct path *);
@@ -1087,6 +1088,9 @@ struct dentry_operations {
 
   d_release: called when a dentry is really deallocated
 
+  d_prune: called prior to pruning (i.e. unhashing and killing) a hashed
+	dentry from the dcache.
+
   d_iput: called when a dentry loses its inode (just prior to its
 	being deallocated). The default when this is NULL is that the
 	VFS calls iput(). If you define this method, you must call
-- 
2.20.1