Fixed MTP to work with TWRP

fs/reiserfs/xattr_trusted.c

@@ -0,0 +1,56 @@
+#include "reiserfs.h"
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/xattr.h>
+#include "xattr.h"
+#include <linux/uaccess.h>
+
+static int
+trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
+	    int handler_flags)
+{
+	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
+		return -EINVAL;
+
+	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
+		return -EPERM;
+
+	return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
+}
+
+static int
+trusted_set(struct dentry *dentry, const char *name, const void *buffer,
+	    size_t size, int flags, int handler_flags)
+{
+	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
+		return -EINVAL;
+
+	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
+		return -EPERM;
+
+	return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
+}
+
+static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size,
+			   const char *name, size_t name_len, int handler_flags)
+{
+	const size_t len = name_len + 1;
+
+	if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
+		return 0;
+
+	if (list && len <= list_size) {
+		memcpy(list, name, name_len);
+		list[name_len] = '\0';
+	}
+	return len;
+}
+
+const struct xattr_handler reiserfs_xattr_trusted_handler = {
+	.prefix = XATTR_TRUSTED_PREFIX,
+	.get = trusted_get,
+	.set = trusted_set,
+	.list = trusted_list,
+};