linux-kernel - [PATCH 1/4] fs - make is_local

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Date:   Wed, 14 Sep 2016 14:14:34 +0800
From:   Ian Kent <raven@...maw.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     autofs mailing list <autofs@...r.kernel.org>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...IV.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Omar Sandoval <osandov@...ndov.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 1/4] fs - make is_local_mountpoint() usable by others

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 <raven@...maw.net>
Cc: Al Viro <viro@...IV.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Omar Sandoval <osandov@...ndov.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 */