[PATCH] netfs: Fix setting of BDP_ASYNC from iocb flags

[Jens Axboe]

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 at kernel.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