X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=fs%2Fext2%2Fext2.h;h=4c69c94cafd84d44a16c5128d750918ec6d9aff3;hb=5dfe5b2c714a5bea0908c1e00da0e8e00535f55c;hp=8d15febd0aa38db2c87031f6473335e8bfea3aac;hpb=a230e95cc66a5a27e53459187ffcedb65b2782c3;p=firefly-linux-kernel-4.4.55.git

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 8d15febd0aa3..4c69c94cafd8 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -684,6 +684,9 @@ struct ext2_inode_info {
 	struct rw_semaphore xattr_sem;
 #endif
 	rwlock_t i_meta_lock;
+#ifdef CONFIG_FS_DAX
+	struct rw_semaphore dax_sem;
+#endif
 
 	/*
 	 * truncate_mutex is for serialising ext2_truncate() against
@@ -699,6 +702,14 @@ struct ext2_inode_info {
 #endif
 };
 
+#ifdef CONFIG_FS_DAX
+#define dax_sem_down_write(ext2_inode)	down_write(&(ext2_inode)->dax_sem)
+#define dax_sem_up_write(ext2_inode)	up_write(&(ext2_inode)->dax_sem)
+#else
+#define dax_sem_down_write(ext2_inode)
+#define dax_sem_up_write(ext2_inode)
+#endif
+
 /*
  * Inode dynamic state flags
  */