2 files changed, 16 insertions, 5 deletions

diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index dd31e7bae35c..e47328f51801 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -52,11 +52,13 @@
 #define REISERFS_IOC32_GETVERSION       FS_IOC32_GETVERSION
 #define REISERFS_IOC32_SETVERSION       FS_IOC32_SETVERSION
 
-/* Locking primitives */
-/* Right now we are still falling back to (un)lock_kernel, but eventually that
-   would evolve into real per-fs locks */
-#define reiserfs_write_lock( sb ) lock_kernel()
-#define reiserfs_write_unlock( sb ) unlock_kernel()
+/*
+ * Locking primitives. The write lock is a per superblock
+ * special mutex that has properties close to the Big Kernel Lock
+ * which was used in the previous locking scheme.
+ */
+void reiserfs_write_lock(struct super_block *s);
+void reiserfs_write_unlock(struct super_block *s);
 
 struct fid;
 
diff --git a/include/linux/reiserfs_fs_sb.h b/include/linux/reiserfs_fs_sb.h
index dab68bbed675..045c37213675 100644
--- a/include/linux/reiserfs_fs_sb.h
+++ b/include/linux/reiserfs_fs_sb.h
@@ -7,6 +7,8 @@
 #ifdef __KERNEL__
 #include <linux/workqueue.h>
 #include <linux/rwsem.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
 #endif
 
 typedef enum {
@@ -355,6 +357,13 @@ struct reiserfs_sb_info {
         struct reiserfs_journal *s_journal;     /* pointer to journal information */
         unsigned short s_mount_state;   /* reiserfs state (valid, invalid) */
 
+        /* Serialize writers access, replace the old bkl */
+        struct mutex lock;
+        /* Owner of the lock (can be recursive) */
+        struct task_struct *lock_owner;
+        /* Depth of the lock, start from -1 like the bkl */
+        int lock_depth;
+
         /* Comment? -Hans */
         void (*end_io_handler) (struct buffer_head *, int);
         hashf_t s_hash_function;        /* pointer to function which is used