linux-ext4 - [Bug 201461] ext4 journal stalls write system call

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Message-ID: <bug-201461-13602-OCrvpuDGp7@https.bugzilla.kernel.org/>
Date:   Thu, 18 Oct 2018 02:02:04 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 201461] ext4 journal stalls write system call

https://bugzilla.kernel.org/show_bug.cgi?id=201461

--- Comment #2 from zhenbianshu@...mail.com ---
(In reply to Theodore Tso from comment #1)
> It shouldn't be the case that the journal's data=ordered writeback would be
> taking the i_data semaphore for writing.   
> 
> I'm guessing what is happening is that journal is causing a lot of I/O
> operations because of data=ordered mode (e.g., not data=writeback), and this
> is delaying a read which a writeback thread was trying to do while it was
> holding a write lock on the inode's semaphore.

can you please show me the related source code of writeback holding a write
lock?

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