autofs4: Add d_automount() dentry operation

Add a function to use the newly defined ->d_automount() dentry operation
for triggering mounts instead of doing the user space callback in ->lookup()
and ->d_revalidate().

Note, to be useful the subsequent patch to add the ->d_manage() dentry
operation is also needed so the discussion of functionality is deferred to
that patch.

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, 6 insertions, 0 deletions

diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 6a930b90d389..0571ec8352b7 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -300,6 +300,7 @@ struct dentry *autofs4_expire_direct(struct super_block *sb,
                         spin_unlock(&root->d_lock);
                 }
                 ino->flags |= AUTOFS_INF_EXPIRING;
+                managed_dentry_set_automount(root);
                 init_completion(&ino->expire_complete);
                 spin_unlock(&sbi->fs_lock);
                 return root;
@@ -408,6 +409,7 @@ found:
                 expired, (int)expired->d_name.len, expired->d_name.name);
         ino = autofs4_dentry_ino(expired);
         ino->flags |= AUTOFS_INF_EXPIRING;
+        managed_dentry_set_automount(expired);
         init_completion(&ino->expire_complete);
         spin_unlock(&sbi->fs_lock);
         spin_lock(&autofs4_lock);
@@ -479,6 +481,8 @@ int autofs4_expire_run(struct super_block *sb,
         spin_lock(&sbi->fs_lock);
         ino = autofs4_dentry_ino(dentry);
         ino->flags &= ~AUTOFS_INF_EXPIRING;
+        if (!d_unhashed(dentry))
+                managed_dentry_clear_automount(dentry);
         complete_all(&ino->expire_complete);
         spin_unlock(&sbi->fs_lock);
 
@@ -516,6 +520,8 @@ int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
                         ino->flags &= ~AUTOFS_INF_MOUNTPOINT;
                 }
                 ino->flags &= ~AUTOFS_INF_EXPIRING;
+                if (ret)
+                        managed_dentry_clear_automount(dentry);
                 complete_all(&ino->expire_complete);
                 spin_unlock(&sbi->fs_lock);
                 dput(dentry);