From 03dd4cb26d967f9588437b0fc9cc0e8353322bb7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?=
 <emulatorman@parabola.nu>
Date: Fri, 25 Mar 2016 03:53:42 -0300
Subject: Linux-libre 4.5-gnu

---
 fs/aufs/loop.c | 133 ---------------------------------------------------------
 1 file changed, 133 deletions(-)
 delete mode 100644 fs/aufs/loop.c

(limited to 'fs/aufs/loop.c')

diff --git a/fs/aufs/loop.c b/fs/aufs/loop.c
deleted file mode 100644
index 5711e7a2f..000000000
--- a/fs/aufs/loop.c
+++ /dev/null
@@ -1,133 +0,0 @@
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- */
-
-/*
- * support for loopback block device as a branch
- */
-
-#include "aufs.h"
-
-/* added into drivers/block/loop.c */
-static struct file *(*backing_file_func)(struct super_block *sb);
-
-/*
- * test if two lower dentries have overlapping branches.
- */
-int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding)
-{
-	struct super_block *h_sb;
-	struct file *backing_file;
-
-	if (unlikely(!backing_file_func)) {
-		/* don't load "loop" module here */
-		backing_file_func = symbol_get(loop_backing_file);
-		if (unlikely(!backing_file_func))
-			/* "loop" module is not loaded */
-			return 0;
-	}
-
-	h_sb = h_adding->d_sb;
-	backing_file = backing_file_func(h_sb);
-	if (!backing_file)
-		return 0;
-
-	h_adding = backing_file->f_path.dentry;
-	/*
-	 * h_adding can be local NFS.
-	 * in this case aufs cannot detect the loop.
-	 */
-	if (unlikely(h_adding->d_sb == sb))
-		return 1;
-	return !!au_test_subdir(h_adding, sb->s_root);
-}
-
-/* true if a kernel thread named 'loop[0-9].*' accesses a file */
-int au_test_loopback_kthread(void)
-{
-	int ret;
-	struct task_struct *tsk = current;
-	char c, comm[sizeof(tsk->comm)];
-
-	ret = 0;
-	if (tsk->flags & PF_KTHREAD) {
-		get_task_comm(comm, tsk);
-		c = comm[4];
-		ret = ('0' <= c && c <= '9'
-		       && !strncmp(comm, "loop", 4));
-	}
-
-	return ret;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#define au_warn_loopback_step	16
-static int au_warn_loopback_nelem = au_warn_loopback_step;
-static unsigned long *au_warn_loopback_array;
-
-void au_warn_loopback(struct super_block *h_sb)
-{
-	int i, new_nelem;
-	unsigned long *a, magic;
-	static DEFINE_SPINLOCK(spin);
-
-	magic = h_sb->s_magic;
-	spin_lock(&spin);
-	a = au_warn_loopback_array;
-	for (i = 0; i < au_warn_loopback_nelem && *a; i++)
-		if (a[i] == magic) {
-			spin_unlock(&spin);
-			return;
-		}
-
-	/* h_sb is new to us, print it */
-	if (i < au_warn_loopback_nelem) {
-		a[i] = magic;
-		goto pr;
-	}
-
-	/* expand the array */
-	new_nelem = au_warn_loopback_nelem + au_warn_loopback_step;
-	a = au_kzrealloc(au_warn_loopback_array,
-			 au_warn_loopback_nelem * sizeof(unsigned long),
-			 new_nelem * sizeof(unsigned long), GFP_ATOMIC);
-	if (a) {
-		au_warn_loopback_nelem = new_nelem;
-		au_warn_loopback_array = a;
-		a[i] = magic;
-		goto pr;
-	}
-
-	spin_unlock(&spin);
-	AuWarn1("realloc failed, ignored\n");
-	return;
-
-pr:
-	spin_unlock(&spin);
-	pr_warn("you may want to try another patch for loopback file "
-		"on %s(0x%lx) branch\n", au_sbtype(h_sb), magic);
-}
-
-int au_loopback_init(void)
-{
-	int err;
-	struct super_block *sb __maybe_unused;
-
-	BUILD_BUG_ON(sizeof(sb->s_magic) != sizeof(unsigned long));
-
-	err = 0;
-	au_warn_loopback_array = kcalloc(au_warn_loopback_step,
-					 sizeof(unsigned long), GFP_NOFS);
-	if (unlikely(!au_warn_loopback_array))
-		err = -ENOMEM;
-
-	return err;
-}
-
-void au_loopback_fin(void)
-{
-	if (backing_file_func)
-		symbol_put(loop_backing_file);
-	kfree(au_warn_loopback_array);
-}
-- 
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