LU-9735 compat: heed the fs_struct::seq

[fs/lustre-release.git] / lustre / include / lustre_compat.h

diff --git a/lustre/include/lustre_compat.h b/lustre/include/lustre_compat.h
index 9bb08dd..b3c42f9 100644 (file)
--- a/lustre/include/lustre_compat.h
+++ b/lustre/include/lustre_compat.h
@@ -51,22 +51,31 @@
 # define UNLOCK_FS_STRUCT(fs)  spin_unlock(&(fs)->lock)
 #endif
 
+#ifdef HAVE_FS_STRUCT_SEQCOUNT
+# define WRITE_FS_SEQ_BEGIN(fs)        write_seqcount_begin(&(fs)->seq)
+# define WRITE_FS_SEQ_END(fs)  write_seqcount_end(&(fs)->seq)
+#else
+# define WRITE_FS_SEQ_BEGIN(fs)
+# define WRITE_FS_SEQ_END(fs)
+#endif
 static inline void ll_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
                                  struct dentry *dentry)
 {
-        struct path path;
-        struct path old_pwd;
-
-        path.mnt = mnt;
-        path.dentry = dentry;
-        LOCK_FS_STRUCT(fs);
-        old_pwd = fs->pwd;
-        path_get(&path);
-        fs->pwd = path;
-        UNLOCK_FS_STRUCT(fs);
-
-        if (old_pwd.dentry)
-                path_put(&old_pwd);
+       struct path path;
+       struct path old_pwd;
+
+       path.mnt = mnt;
+       path.dentry = dentry;
+       path_get(&path);
+       LOCK_FS_STRUCT(fs);
+       WRITE_FS_SEQ_BEGIN(fs);
+       old_pwd = fs->pwd;
+       fs->pwd = path;
+       WRITE_FS_SEQ_END(fs);
+       UNLOCK_FS_STRUCT(fs);
+
+       if (old_pwd.dentry)
+               path_put(&old_pwd);
 }
 
 /*