autofs4: Add v4 pseudo direct mount support

Version 4 of autofs provides a pseudo direct mount implementation
that relies on directories at the leaves of a directory tree under
an indirect mount to trigger mounts.

This patch adds support for that functionality.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 58 insertions, 0 deletions

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 8315565ed7d4..9194e274f849 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -630,6 +630,58 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
         return 0;
 }
 
+/*
+ * Version 4 of autofs provides a pseudo direct mount implementation
+ * that relies on directories at the leaves of a directory tree under
+ * an indirect mount to trigger mounts. To allow for this we need to
+ * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves
+ * of the directory tree. There is no need to clear the automount flag
+ * following a mount or restore it after an expire because these mounts
+ * are always covered. However, it is neccessary to ensure that these
+ * flags are clear on non-empty directories to avoid unnecessary calls
+ * during path walks.
+ */
+static void autofs_set_leaf_automount_flags(struct dentry *dentry)
+{
+        struct dentry *parent;
+
+        /* root and dentrys in the root are already handled */
+        if (IS_ROOT(dentry->d_parent))
+                return;
+
+        managed_dentry_set_managed(dentry);
+
+        parent = dentry->d_parent;
+        /* only consider parents below dentrys in the root */
+        if (IS_ROOT(parent->d_parent))
+                return;
+        managed_dentry_clear_managed(parent);
+        return;
+}
+
+static void autofs_clear_leaf_automount_flags(struct dentry *dentry)
+{
+        struct list_head *d_child;
+        struct dentry *parent;
+
+        /* flags for dentrys in the root are handled elsewhere */
+        if (IS_ROOT(dentry->d_parent))
+                return;
+
+        managed_dentry_clear_managed(dentry);
+
+        parent = dentry->d_parent;
+        /* only consider parents below dentrys in the root */
+        if (IS_ROOT(parent->d_parent))
+                return;
+        d_child = &dentry->d_u.d_child;
+        /* Set parent managed if it's becoming empty */
+        if (d_child->next == &parent->d_subdirs &&
+            d_child->prev == &parent->d_subdirs)
+                managed_dentry_set_managed(parent);
+        return;
+}
+
 static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
 {
         struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
@@ -657,6 +709,9 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
         spin_unlock(&dentry->d_lock);
         spin_unlock(&autofs4_lock);
 
+        if (sbi->version < 5)
+                autofs_clear_leaf_automount_flags(dentry);
+
         if (atomic_dec_and_test(&ino->count)) {
                 p_ino = autofs4_dentry_ino(dentry->d_parent);
                 if (p_ino && dentry->d_parent != dentry)
@@ -699,6 +754,9 @@ static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         }
         d_add(dentry, inode);
 
+        if (sbi->version < 5)
+                autofs_set_leaf_automount_flags(dentry);
+
         dentry->d_fsdata = ino;
         ino->dentry = dget(dentry);
         atomic_inc(&ino->count);