1 files changed, 27 insertions, 2 deletions

diff --git a/fs/jfs/jfs_incore.h b/fs/jfs/jfs_incore.h
index 94005584445..8f453eff3c8 100644
--- a/fs/jfs/jfs_incore.h
+++ b/fs/jfs/jfs_incore.h
@@ -109,9 +109,11 @@ struct jfs_inode_info {
 
 #define JFS_ACL_NOT_CACHED ((void *)-1)
 
-#define IREAD_LOCK(ip)          down_read(&JFS_IP(ip)->rdwrlock)
+#define IREAD_LOCK(ip, subclass) \
+        down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
 #define IREAD_UNLOCK(ip)        up_read(&JFS_IP(ip)->rdwrlock)
-#define IWRITE_LOCK(ip)         down_write(&JFS_IP(ip)->rdwrlock)
+#define IWRITE_LOCK(ip, subclass) \
+        down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
 #define IWRITE_UNLOCK(ip)       up_write(&JFS_IP(ip)->rdwrlock)
 
 /*
@@ -127,6 +129,29 @@ enum cflags {
         COMMIT_Synclist,        /* metadata pages on group commit synclist */
 };
 
+/*
+ * commit_mutex nesting subclasses:
+ */
+enum commit_mutex_class
+{
+        COMMIT_MUTEX_PARENT,
+        COMMIT_MUTEX_CHILD,
+        COMMIT_MUTEX_SECOND_PARENT,     /* Renaming */
+        COMMIT_MUTEX_VICTIM             /* Inode being unlinked due to rename */
+};
+
+/*
+ * rdwrlock subclasses:
+ * The dmap inode may be locked while a normal inode or the imap inode are
+ * locked.
+ */
+enum rdwrlock_class
+{
+        RDWRLOCK_NORMAL,
+        RDWRLOCK_IMAP,
+        RDWRLOCK_DMAP
+};
+
 #define set_cflag(flag, ip)     set_bit(flag, &(JFS_IP(ip)->cflag))
 #define clear_cflag(flag, ip)   clear_bit(flag, &(JFS_IP(ip)->cflag))
 #define test_cflag(flag, ip)    test_bit(flag, &(JFS_IP(ip)->cflag))