From 7bcfde2601c220ba8332941706e891e7fd4f444a Mon Sep 17 00:00:00 2001
From: Liujie Xie <xieliujie@oppo.com>
Date: Mon, 12 Jul 2021 20:37:25 +0800
Subject: [PATCH] ANDROID: ashmem: Export is_ashmem_file

Export is_ashmem_file function which will be used
by the minidump module to get ashmem info.

Bug: 193397560
Change-Id: I5b7816ad4775e5cf2c4f41c28b1c8dacc2c85b7e
Signed-off-by: liuhailong <liuhailong@oppo.com>
Signed-off-by: Liujie Xie <xieliujie@oppo.com>
---
 drivers/staging/android/ashmem.c | 9 +++++++++
 drivers/staging/android/ashmem.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 900cad5d79da..05e47ce9657d 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -915,6 +915,15 @@ static const struct file_operations ashmem_fops = {
 #endif
 };
 
+/*
+ * is_ashmem_file - Check if struct file* is associated with ashmem
+ */
+int is_ashmem_file(struct file *file)
+{
+	return file->f_op == &ashmem_fops;
+}
+EXPORT_SYMBOL_GPL(is_ashmem_file);
+
 static struct miscdevice ashmem_misc = {
 	.minor = MISC_DYNAMIC_MINOR,
 	.name = "ashmem",
diff --git a/drivers/staging/android/ashmem.h b/drivers/staging/android/ashmem.h
index 1a478173cd21..9fa72ed7b7ed 100644
--- a/drivers/staging/android/ashmem.h
+++ b/drivers/staging/android/ashmem.h
@@ -21,4 +21,6 @@
 #define COMPAT_ASHMEM_SET_PROT_MASK	_IOW(__ASHMEMIOC, 5, unsigned int)
 #endif
 
+int is_ashmem_file(struct file *file);
+
 #endif	/* _LINUX_ASHMEM_H */