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From:   liuhailong <liuhailong@oppo.com>
To:     gregkh@linuxfoundation.org, arve@android.com, tkjos@android.com,
        maco@android.com, joel@joelfernandes.org, christian@brauner.io,
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Cc:     linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev,
        liuhailong <liuhailong@oppo.com>
Subject: [PATCH] staging: android: ashmem: add size field in procfs fdinfo
Date:   Fri, 18 Jun 2021 17:50:35 +0800
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add this information to help user to find ashmem problem.

ashmem leak scenario:
-000|fd = ashmem_create_region
-001|mmap and pagefault
-002|munmap
-003|forget close(fd) <---- which lead to ashmem leak

Signed-off-by: liuhailong <liuhailong@oppo.com>
---
 drivers/staging/android/ashmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index d66a64e42273..ee2fd75111d8 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -894,6 +894,8 @@ static void ashmem_show_fdinfo(struct seq_file *m, struct file *file)
 		seq_printf(m, "name:\t%s\n",
 			   asma->name + ASHMEM_NAME_PREFIX_LEN);
 
+	seq_printf(m, "size:\t%zu\n", asma->size);
+
 	mutex_unlock(&ashmem_mutex);
 }
 #endif
-- 
2.30.2