ntfs3: drop inode references in ntfs_put_super()

Recently we moved most cleanup from ntfs_put_super() into
ntfs3_kill_sb() as part of a bigger cleanup.  This accidently also moved
dropping inode references stashed in ntfs3's sb->s_fs_info from
@sb->put_super() to @sb->kill_sb().  But generic_shutdown_super()
verifies that there are no busy inodes past sb->put_super().  Fix this
and disentangle dropping inode references from freeing @sb->s_fs_info.

Fixes: a4f64a30 ("ntfs3: free the sbi in ->kill_sb") # mainline only
Reported-by: NGuenter Roeck <linux@roeck-us.net>
Tested-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NChristian Brauner <brauner@kernel.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/ntfs3/super.c

@@ -571,12 +571,8 @@ static void init_once(void *foo)
 /*
  * Noinline to reduce binary size.
  */
-static noinline void ntfs3_free_sbi(struct ntfs_sb_info *sbi)
+static noinline void ntfs3_put_sbi(struct ntfs_sb_info *sbi)
 {
-	kfree(sbi->new_rec);
-	kvfree(ntfs_put_shared(sbi->upcase));
-	kfree(sbi->def_table);
-
 	wnd_close(&sbi->mft.bitmap);
 	wnd_close(&sbi->used.bitmap);
 
@@ -601,6 +597,13 @@ static noinline void ntfs3_free_sbi(struct ntfs_sb_info *sbi)
 	indx_clear(&sbi->security.index_sdh);
 	indx_clear(&sbi->reparse.index_r);
 	indx_clear(&sbi->objid.index_o);
+}
+
+static void ntfs3_free_sbi(struct ntfs_sb_info *sbi)
+{
+	kfree(sbi->new_rec);
+	kvfree(ntfs_put_shared(sbi->upcase));
+	kfree(sbi->def_table);
 	kfree(sbi->compress.lznt);
 #ifdef CONFIG_NTFS3_LZX_XPRESS
 	xpress_free_decompressor(sbi->compress.xpress);
@@ -625,6 +628,7 @@ static void ntfs_put_super(struct super_block *sb)
 
 	/* Mark rw ntfs as clear, if possible. */
 	ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
+	ntfs3_put_sbi(sbi);
 }
 
 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
@@ -1644,8 +1648,10 @@ static void ntfs_fs_free(struct fs_context *fc)
 	struct ntfs_mount_options *opts = fc->fs_private;
 	struct ntfs_sb_info *sbi = fc->s_fs_info;
 
-	if (sbi)
+	if (sbi) {
+		ntfs3_put_sbi(sbi);
 		ntfs3_free_sbi(sbi);
+	}
 
 	if (opts)
 		put_mount_options(opts);