new helpers: lock_mount_hash/unlock_mount_hash

[linux-2.6-block.git] / fs / mount.h

diff --git a/fs/mount.h b/fs/mount.h
index 3168dc41bad5b5529f0aa4d68868c0060f65ccef..7076f25af35d939e4d0b6ca721b15d227203a82c 100644 (file)
--- 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 @@ static inline void get_mnt_ns(struct mnt_namespace *ns)
        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;