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

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Message-ID: <bug-201461-13602-x39Iam2bU3@https.bugzilla.kernel.org/>
Date:   Thu, 18 Oct 2018 14:12:23 +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 #5 from Theodore Tso (tytso@....edu) ---
Keep in mind that 3.10 was released over ***five years*** ago.   Quite frankly,
using a 3.10 kernel borders on malpractice, since it has so many unpatched
security holes it isn't funny.  If you are talking about a RHEL kernel, it has
diverged significantly from mainline and whether or not it is a security
disaster is between you and your Red Hat support contract.  :-)

My comments apply mainly to the the upstream development kernel, but to answer
your questions:

No, in 3.10, generic_writepages() does not call ext4_da_writepages().   And
ext4_da_writepages roughly corresponds to what ext4_writepages() in
non-obsolete kernels.

A huge number of things have changed between 3.10 and more modern kernels,
including many performance enhancements.   So some of the details have changed.

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