linux-kernel - Re: [PATCH 3/3] overlayfs: Check writeback errors w.r.t upper in ->syncfs()

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Date:   Sat, 19 Dec 2020 07:25:12 +1100
From:   NeilBrown <neilb@...e.de>
To:     Jeffrey Layton <jlayton@...nel.org>,
        Vivek Goyal <vgoyal@...hat.com>
Cc:     Jeff Layton <jlayton@...nel.org>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-unionfs@...r.kernel.org,
        amir73il@...il.com, sargun@...gun.me, miklos@...redi.hu,
        willy@...radead.org, jack@...e.cz, neilb@...e.com,
        viro@...iv.linux.org.uk
Subject: Re: [PATCH 3/3] overlayfs: Check writeback errors w.r.t upper in
 ->syncfs()

On Fri, Dec 18 2020, Jeffrey Layton wrote:
>
> The patch we're discussing here _does_ add a f_op->syncfs, which is why
> I was suggesting to do it that way.

I haven't thought through the issues to decide what I think of adding a
new op, but I already know what I think of adding ->syncfs.  Don't Do
It.  The name is much too easily confused with ->sync_fs.

If you call it ->sync_fs_return_error() it would be MUCH better.

And having said that, the solution becomes obvious.  Add a new flag,
either as another bit in 'int wait', or as a new bool.
The new flag would be "return_error" - or whatever is appropriate.

NeilBrown

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