How does EXT4 ensures two processes don't modify and synchronize one page at the same time.

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To: "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>
Subject: How does EXT4 ensures two processes don't modify and synchronize one page at the same time.
From: Lyu Tao <tao.lyu@xxxxxxx>
Date: Mon, 24 Jan 2022 17:17:34 +0000
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Thread-topic: How does EXT4 ensures two processes don't modify and synchronize one page at the same time.

Hi,

I'm new to file system area and have a naive question about the global sync.

Let's suppose there are two process are writing to the same file. If one process issues a sync() syscall, which mechanism can ensures the two processes don't modify and synchronize one page at the same time.

Best,
Tao

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