autofs-5.1.3 - add function ext_mount_inuse()

From: Ian Kent <raven@themaw.net>

Add function to check if a path is an amd externally managed mount.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 CHANGELOG        |    1 +
 include/mounts.h |    1 +
 lib/mounts.c     |   17 +++++++++++++++++
 3 files changed, 19 insertions(+)

--- autofs-5.0.7.orig/CHANGELOG
+++ autofs-5.0.7/CHANGELOG
@@ -279,6 +279,7 @@
 - fix possible memory leak during amd parse.
 - remove path restriction of amd external mount.
 - add function umount_amd_ext_mount().
+- add function ext_mount_inuse().
 
 25/07/2012 autofs-5.0.7
 =======================
--- autofs-5.0.7.orig/include/mounts.h
+++ autofs-5.0.7/include/mounts.h
@@ -98,6 +98,7 @@ char *make_options_string(char *path, in
 char *make_mnt_name_string(char *path);
 int ext_mount_add(struct list_head *, const char *, unsigned int);
 int ext_mount_remove(struct list_head *, const char *);
+int ext_mount_inuse(const char *);
 struct mnt_list *get_mnt_list(const char *table, const char *path, int include);
 struct mnt_list *reverse_mnt_list(struct mnt_list *list);
 void free_mnt_list(struct mnt_list *list);
--- autofs-5.0.7.orig/lib/mounts.c
+++ autofs-5.0.7/lib/mounts.c
@@ -768,6 +768,23 @@ done:
 	return ret;
 }
 
+int ext_mount_inuse(const char *path)
+{
+	struct ext_mount *em;
+	int ret = 0;
+
+	pthread_mutex_lock(&ext_mount_hash_mutex);
+	em = ext_mount_lookup(path);
+	if (!em)
+		goto done;
+
+	if (!list_empty(&em->mounts))
+		ret = 1;
+done:
+	pthread_mutex_unlock(&ext_mount_hash_mutex);
+	return ret;
+}
+
 /*
  * Get list of mounts under path in longest->shortest order
  */