linux-ext4 - Re: [ext4 io hang] buffered write io hang in balance_dirty

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Date:   Mon, 1 May 2023 06:47:44 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, Theodore Ts'o <tytso@....edu>,
        Baokun Li <libaokun1@...wei.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-ext4@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-block@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Dave Chinner <dchinner@...hat.com>,
        Eric Sandeen <sandeen@...hat.com>,
        Zhang Yi <yi.zhang@...hat.com>,
        yangerkun <yangerkun@...wei.com>
Subject: Re: [ext4 io hang] buffered write io hang in balance_dirty_pages

On Sat, Apr 29, 2023 at 01:10:49PM +0800, Ming Lei wrote:
> Not sure if it is needed for non s_bdev

So you don't want to work this at all for btrfs?  Or the XFS log device,
or ..

> , because FS is over stackable device
> directly. Stackable device has its own logic for handling underlying disks dead
> or deleted, then decide if its own disk needs to be deleted, such as, it is
> fine for raid1 to work from user viewpoint if one underlying disk is deleted.

We still need to propagate the even that device has been removed upwards.
Right now some file systems (especially XFS) are good at just propagating
it from an I/O error.  And explicity call would be much better.