linux-kernel - Re: [PATCH RFC v2 01/18] blk-mq: Add a flag for reserved requests

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Message-ID: <bc567212-af8c-6aba-30ab-fb1b2390e2e4@huawei.com>
Date:   Tue, 14 Jun 2022 19:30:20 +0100
From:   John Garry <john.garry@...wei.com>
To:     Bart Van Assche <bvanassche@....org>, <axboe@...nel.dk>,
        <damien.lemoal@...nsource.wdc.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <brking@...ibm.com>, <hare@...e.de>,
        <hch@....de>
CC:     <linux-block@...r.kernel.org>, <linux-ide@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <chenxiang66@...ilicon.com>
Subject: Re: [PATCH RFC v2 01/18] blk-mq: Add a flag for reserved requests

On 14/06/2022 19:00, Bart Van Assche wrote:
> On 6/9/22 03:29, John Garry wrote:
>> Add a flag for reserved requests so that drivers may know this for any
>> special handling.
>>
>> The 'reserved' argument in blk_mq_ops.timeout callback could now be
>> replaced by using this flag.
> 
> Why not to combine that change into this patch?
> 

If we remove the 'reserved' argument in blk_mq_ops.timeout callback then 
we can also remove the 'reserved' member of busy_tag_iter_fn. I gave 
that all a try and the diffstat looks like this:

  block/blk-mq-debugfs.c              |  2 +-
  block/blk-mq-tag.c                  | 13 +++++--------
  block/blk-mq.c                      | 22 +++++++++++++---------
  block/bsg-lib.c                     |  2 +-
  drivers/block/mtip32xx/mtip32xx.c   | 11 +++++------
  drivers/block/nbd.c                 |  5 ++---
  drivers/block/null_blk/main.c       |  2 +-
  drivers/infiniband/ulp/srp/ib_srp.c |  3 +--
  drivers/mmc/core/queue.c            |  3 +--
  drivers/nvme/host/apple.c           |  3 +--
  drivers/nvme/host/core.c            |  2 +-
  drivers/nvme/host/fc.c              |  6 ++----
  drivers/nvme/host/nvme.h            |  2 +-
  drivers/nvme/host/pci.c             |  2 +-
  drivers/nvme/host/rdma.c            |  3 +--
  drivers/nvme/host/tcp.c             |  3 +--
  drivers/s390/block/dasd.c           |  2 +-
  drivers/scsi/aacraid/comminit.c     |  2 +-
  drivers/scsi/aacraid/linit.c        |  2 +-
  drivers/scsi/hosts.c                | 14 ++++++--------
  drivers/scsi/mpi3mr/mpi3mr_os.c     | 15 ++++-----------
  drivers/scsi/scsi_lib.c             | 12 ++----------
  include/linux/blk-mq.h              | 10 ++++++++--
  include/scsi/scsi_host.h            |  2 +-
  24 files changed, 62 insertions(+), 81 deletions(-)

It would seem sensible to send that all separately and break it down a 
bit - this series is already almost unmanageable.

> Anyway:
> 
> Reviewed-by: Bart Van Assche <bvanassche@....org>
> .

Thanks