linux-ext4 - [Bug 200739] I/O error on read-ahead inode blocks does not get detected or reported

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Message-ID: <bug-200739-13602-kKOm3D4eRk@https.bugzilla.kernel.org/>
Date:   Tue, 07 Aug 2018 01:42:44 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 200739] I/O error on read-ahead inode blocks does not get
 detected or reported

https://bugzilla.kernel.org/show_bug.cgi?id=200739

Theodore Tso (tytso@....edu) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tytso@....edu

--- Comment #6 from Theodore Tso (tytso@....edu) ---
Does this actually cause an user-visible problem?   If we do readahead for an
inode table block never gets used by the user, and that block is never used
(perhaps because no inodes have been written using that indoe table block), why
should we mark the file system as corrupted?   

Especially given that with modern block devices, when we *do* write to the
inode table block, it will probably use redirect the failed sector to a spare
block replacement pool automatically, at which point subsequent reads to that
inode table block will be *fine*.

So prematurely deciding that just because an speculative, readahead access to a
sector returns a media error, is grounds to declare the file system corrupted
(which could force a reboot if errors=panic is set), seems to be a massive
overreaction.   

Why do you think we should signal an error in this case?

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