linux-ext4 - How does EXT4 ensures two processes don't modify and synchronize one page at the same time.

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Message-ID: <6fdeab9535134fc18e86968b10e726c6@epfl.ch>
Date:   Mon, 24 Jan 2022 17:17:34 +0000
From:   Lyu Tao <tao.lyu@...l.ch>
To:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: 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