GIT: unionfs2-2.6.27.y: Unionfs: display mount point name along with generation number

[Erez Zadok]

commit 5610cc5c451b637fb5b52c7d463b27c60dfccfef
Author: Erez Zadok <ezk at cs.sunysb.edu>
Date:   Mon Mar 24 17:29:42 2008 -0400

    Unionfs: display mount point name along with generation number
    
    CC: Dave Miller <justdave at mozilla.com>
    
    Signed-off-by: Erez Zadok <ezk at cs.sunysb.edu>

diff --git a/fs/unionfs/main.c b/fs/unionfs/main.c
index 8f59fb5..b76264a 100644
--- a/fs/unionfs/main.c
+++ b/fs/unionfs/main.c
@@ -736,7 +736,12 @@ static int unionfs_get_sb(struct file_system_type *fs_type,
 			  int flags, const char *dev_name,
 			  void *raw_data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, raw_data, unionfs_read_super, mnt);
+	int err;
+	err = get_sb_nodev(fs_type, flags, raw_data, unionfs_read_super, mnt);
+	if (!err)
+		UNIONFS_SB(mnt->mnt_sb)->dev_name =
+			kstrdup(dev_name, GFP_KERNEL);
+	return err;
 }
 
 static struct file_system_type unionfs_fs_type = {
diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index 2456654..e5cb235 100644
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -134,6 +134,7 @@ static void unionfs_put_super(struct super_block *sb)
 		atomic_dec(&s->s_active);
 	}
 
+	kfree(spd->dev_name);
 	kfree(spd->data);
 	kfree(spd);
 	sb->s_fs_info = NULL;
@@ -805,7 +806,8 @@ out_no_change:
 	atomic_set(&UNIONFS_D(sb->s_root)->generation, i);
 	atomic_set(&UNIONFS_I(sb->s_root->d_inode)->generation, i);
 	if (!(*flags & MS_SILENT))
-		pr_info("unionfs: new generation number %d\n", i);
+		pr_info("unionfs: %s: new generation number %d\n",
+			UNIONFS_SB(sb)->dev_name, i);
 	/* finally, update the root dentry's times */
 	unionfs_copy_attr_times(sb->s_root->d_inode);
 	err = 0;		/* reset to success */
diff --git a/fs/unionfs/union.h b/fs/unionfs/union.h
index ecf417d..735d40c 100644
--- a/fs/unionfs/union.h
+++ b/fs/unionfs/union.h
@@ -166,6 +166,7 @@ struct unionfs_sb_info {
 	struct unionfs_rw_semaphore rwsem;
 	pid_t write_lock_owner;	/* PID of rw_sem owner (write lock) */
 	int high_branch_id;	/* last unique branch ID given */
+	char *dev_name;		/* to identify different unions in pr_debug */
 	struct unionfs_data *data;
 };