Fixed MTP to work with TWRP

fs/gfs2/acl.c

@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/gfs2_ondisk.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "acl.h"
+#include "xattr.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "trans.h"
+#include "util.h"
+
+static const char *gfs2_acl_name(int type)
+{
+	switch (type) {
+	case ACL_TYPE_ACCESS:
+		return GFS2_POSIX_ACL_ACCESS;
+	case ACL_TYPE_DEFAULT:
+		return GFS2_POSIX_ACL_DEFAULT;
+	}
+	return NULL;
+}
+
+struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
+{
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct posix_acl *acl;
+	const char *name;
+	char *data;
+	int len;
+
+	if (!ip->i_eattr)
+		return NULL;
+
+	name = gfs2_acl_name(type);
+	if (name == NULL)
+		return ERR_PTR(-EINVAL);
+
+	len = gfs2_xattr_acl_get(ip, name, &data);
+	if (len < 0)
+		return ERR_PTR(len);
+	if (len == 0)
+		return NULL;
+
+	acl = posix_acl_from_xattr(&init_user_ns, data, len);
+	kfree(data);
+	return acl;
+}
+
+int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+{
+	int error;
+	int len;
+	char *data;
+	const char *name = gfs2_acl_name(type);
+
+	BUG_ON(name == NULL);
+
+	if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
+		return -E2BIG;
+
+	if (type == ACL_TYPE_ACCESS) {
+		umode_t mode = inode->i_mode;
+
+		error = posix_acl_equiv_mode(acl, &mode);
+		if (error < 0)
+			return error;
+
+		if (error == 0)
+			acl = NULL;
+
+		if (mode != inode->i_mode) {
+			inode->i_mode = mode;
+			mark_inode_dirty(inode);
+		}
+	}
+
+	if (acl) {
+		len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
+		if (len == 0)
+			return 0;
+		data = kmalloc(len, GFP_NOFS);
+		if (data == NULL)
+			return -ENOMEM;
+		error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
+		if (error < 0)
+			goto out;
+	} else {
+		data = NULL;
+		len = 0;
+	}
+
+	error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
+	if (error)
+		goto out;
+
+	if (acl)
+		set_cached_acl(inode, type, acl);
+	else
+		forget_cached_acl(inode, type);
+out:
+	kfree(data);
+	return error;
+}