new helpers: lock_mount_hash/unlock_mount_hash
aka br_write_{lock,unlock} of vfsmount_lock. Inlines in fs/mount.h,
vfsmount_lock extern moved over there as well.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/mount.h b/fs/mount.h
index 3168dc4..7076f25 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -1,6 +1,7 @@
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
+#include <linux/lglock.h>
struct mnt_namespace {
atomic_t count;
@@ -83,6 +84,18 @@
atomic_inc(&ns->count);
}
+extern struct lglock vfsmount_lock;
+
+static inline void lock_mount_hash(void)
+{
+ br_write_lock(&vfsmount_lock);
+}
+
+static inline void unlock_mount_hash(void)
+{
+ br_write_unlock(&vfsmount_lock);
+}
+
struct proc_mounts {
struct seq_file m;
struct mnt_namespace *ns;