linux-kernel - Re: [PATCH] netfs: Fix setting of BDP

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Date: Tue, 21 May 2024 09:52:32 -0600
From: Jens Axboe <axboe@...nel.dk>
To: David Howells <dhowells@...hat.com>, Steve French <stfrench@...rosoft.com>
Cc: Jeff Layton <jlayton@...nel.org>, Enzo Matsumiya <ematsumiya@...e.de>,
 Matthew Wilcox <willy@...radead.org>, Christian Brauner
 <brauner@...nel.org>, netfs@...ts.linux.dev, v9fs@...ts.linux.dev,
 linux-afs@...ts.infradead.org, linux-cifs@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] netfs: Fix setting of BDP_ASYNC from iocb flags

On 5/21/24 9:49 AM, David Howells wrote:
> Fix netfs_perform_write() to set BDP_ASYNC if IOCB_NOWAIT is set rather
> than if IOCB_SYNC is not set.  It reflects asynchronicity in the sense of
> not waiting rather than synchronicity in the sense of not returning until
> the op is complete.
> 
> Without this, generic/590 fails on cifs in strict caching mode with a
> complaint that one of the writes fails with EAGAIN.  The test can be
> distilled down to:
> 
>         mount -t cifs /my/share /mnt -ostuff
>         xfs_io -i -c 'falloc 0 8191M -c fsync -f /mnt/file
>         xfs_io -i -c 'pwrite -b 1M -W 0 8191M' /mnt/file

Looks good to me:

Reviewed-by: Jens Axboe <axboe@...nel.dk>

However, I'll note that BDP_ASYNC is horribly named, it should be
BDP_NOWAIT instead. But that's a separate thing, fix looks correct
as-is.

-- 
Jens Axboe