[PATCH 1/4] fs - make is_local_mountpoint() usable by others

[Ian Kent]

The is_local_mountpoint() function will be needed for autofs
to check if a dentry is a mountpoint in the current namespace.

Signed-off-by: Ian Kent <ra...@themaw.net>
Cc: Al Viro <v...@zeniv.linux.org.uk>
Cc: Eric W. Biederman <ebied...@xmission.com>
Cc: Omar Sandoval <osan...@osandov.com>
---
 fs/mount.h            |    9 ---------
 fs/namespace.c        |    1 +
 include/linux/mount.h |    9 +++++++++
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/fs/mount.h b/fs/mount.h
index 14db05d..c25e6e8 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -127,12 +127,3 @@ struct proc_mounts {
 };
 
 extern const struct seq_operations mounts_op;
-
-extern bool __is_local_mountpoint(struct dentry *dentry);
-static inline bool is_local_mountpoint(struct dentry *dentry)
-{
-       if (!d_mountpoint(dentry))
-               return false;
-
-       return __is_local_mountpoint(dentry);
-}
diff --git a/fs/namespace.c b/fs/namespace.c
index 7bb2cda..bea1507 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -725,6 +725,7 @@ bool __is_local_mountpoint(struct dentry *dentry)
 out:
        return is_covered;
 }
+EXPORT_SYMBOL(__is_local_mountpoint);
 
 static struct mountpoint *lookup_mountpoint(struct dentry *dentry)
 {
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 54a594d..575b745 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -15,6 +15,7 @@
 #include <linux/spinlock.h>
 #include <linux/seqlock.h>
 #include <linux/atomic.h>
+#include <linux/dcache.h>
 
 struct super_block;
 struct vfsmount;
@@ -96,4 +97,12 @@ extern void mark_mounts_for_expiry(struct list_head *mounts);
 
 extern dev_t name_to_dev_t(const char *name);
 
+extern bool __is_local_mountpoint(struct dentry *dentry);
+static inline bool is_local_mountpoint(struct dentry *dentry)
+{
+       if (!d_mountpoint(dentry))
+               return false;
+
+       return __is_local_mountpoint(dentry);
+}
 #endif /* _LINUX_MOUNT_H */