+static void autofs4_add_rehash_entry(struct autofs_info *ino,
+ struct rehash_entry *entry)
+{
+ entry->task = current;
+ INIT_LIST_HEAD(&entry->list);
+ list_add(&entry->list, &ino->rehash_list);
+ return;
+}
+
+static void autofs4_remove_rehash_entry(struct autofs_info *ino)
+{
+ struct list_head *head = &ino->rehash_list;
+ struct rehash_entry *entry;
+ list_for_each_entry(entry, head, list) {
+ if (entry->task == current) {
+ list_del(&entry->list);
+ kfree(entry);
+ break;
+ }
+ }
+ return;
+}
+
+static void autofs4_remove_rehash_entrys(struct autofs_info *ino)
+{
+ struct autofs_sb_info *sbi = ino->sbi;
+ struct rehash_entry *entry, *next;
+ struct list_head *head;
+
+ spin_lock(&sbi->fs_lock);
+ spin_lock(&sbi->lookup_lock);
+ if (!(ino->flags & AUTOFS_INF_REHASH)) {
+ spin_unlock(&sbi->lookup_lock);
+ spin_unlock(&sbi->fs_lock);
+ return;
+ }
+ ino->flags &= ~AUTOFS_INF_REHASH;
+ head = &ino->rehash_list;
+ list_for_each_entry_safe(entry, next, head, list) {
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ spin_unlock(&sbi->lookup_lock);
+ spin_unlock(&sbi->fs_lock);
+ dput(ino->dentry);
+
+ return;
+}
+
+static void autofs4_revalidate_drop(struct dentry *dentry,
+ struct rehash_entry *entry)
+{
+ struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+ struct autofs_info *ino = autofs4_dentry_ino(dentry);
+ /*
+ * Add to the active list so we can pick this up in
+ * ->lookup(). Also add an entry to a rehash list so
+ * we know when there are no dentrys in flight so we
+ * know when we can rehash the dentry.
+ */
+ spin_lock(&sbi->lookup_lock);
+ if (list_empty(&ino->active))
+ list_add(&ino->active, &sbi->active_list);
+ autofs4_add_rehash_entry(ino, entry);
+ spin_unlock(&sbi->lookup_lock);
+ if (!(ino->flags & AUTOFS_INF_REHASH)) {
+ ino->flags |= AUTOFS_INF_REHASH;
+ dget(dentry);
+ spin_lock(&dentry->d_lock);
+ __d_drop(dentry);
+ spin_unlock(&dentry->d_lock);
+ }
+ return;
+}
+
+static void autofs4_revalidate_rehash(struct dentry *dentry)
+{
+ struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+ struct autofs_info *ino = autofs4_dentry_ino(dentry);
+ if (ino->flags & AUTOFS_INF_REHASH) {
+ spin_lock(&sbi->lookup_lock);
+ autofs4_remove_rehash_entry(ino);
+ if (list_empty(&ino->rehash_list)) {
+ spin_unlock(&sbi->lookup_lock);
+ ino->flags &= ~AUTOFS_INF_REHASH;
+ d_rehash(dentry);
+ dput(ino->dentry);
+ } else
+ spin_unlock(&sbi->lookup_lock);
+ }
+ return;
+}
+