linux-kernel - Re: [PATCH v2 0/6] blk-mq: Add a flag for reserved requests series

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Date:   Tue, 28 Jun 2022 09:27:37 +0100
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>
CC:     <linux-doc@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <linux-nvme@...ts.infradead.org>,
        <linux-s390@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <mpi3mr-linuxdrv.pdl@...adcom.com>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <nbd@...er.debian.org>,
        <damien.lemoal@...nsource.wdc.com>, <jejb@...ux.ibm.com>,
        <hch@....de>, <martin.petersen@...cle.com>, <kartilak@...co.com>,
        <bvanassche@....org>, <satishkh@...co.com>, <hare@...e.de>,
        <sebaddel@...co.com>
Subject: Re: [PATCH v2 0/6] blk-mq: Add a flag for reserved requests series

On 21/06/2022 12:15, John Garry wrote:

Hi Jens,

about this series, would you be ok to pick this up for merging? Do you 
find the changes acceptable?

Thanks,
John

> In [0] I included "blk-mq: Add a flag for reserved requests" to identify
> if a request is 'reserved' for special handling. Doing this is easier than
> passing a 'reserved' arg to the blk_mq_ops callbacks. Indeed, only 1x
> timeout implementation or blk-mq iter function actually uses the
> 'reserved' arg (or 3x if you count SCSI core and FNIC SCSI driver). So
> this series drops the 'reserved' arg for these timeout and iter functions.
> Christoph suggested that I try to upstream now.
> 
> Differences to v1:
> - Use "scsi_timeout" as name for SCSI timeout function and update docs
> - Add RB tags (thanks!)
> - Split out patch to drop local variables for 'reserved', as requested by
>    Bart
> 
> Based on following:
> 6dbcddf6e76b (block/for-5.20/block) block: bfq: Fix kernel-doc headers
> 
> [0] https://lore.kernel.org/linux-scsi/1654770559-101375-1-git-send-email-john.garry@huawei.com/T/#m22aa9f89e55835edc2e650d43f7e3219a3a1a324
> 
> John Garry (6):
>    scsi: core: Remove reserved request time-out handling
>    blk-mq: Add a flag for reserved requests
>    blk-mq: Drop blk_mq_ops.timeout 'reserved' arg
>    scsi: fnic: Drop reserved request handling
>    blk-mq: Drop 'reserved' arg of busy_tag_iter_fn
>    blk-mq: Drop local variable for reserved tag
> 
>   Documentation/scsi/scsi_eh.rst          |  3 +--
>   Documentation/scsi/scsi_mid_low_api.rst |  2 +-
>   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/s390/block/dasd_int.h           |  2 +-
>   drivers/scsi/aacraid/comminit.c         |  2 +-
>   drivers/scsi/aacraid/linit.c            |  2 +-
>   drivers/scsi/fnic/fnic_scsi.c           | 14 ++++----------
>   drivers/scsi/hosts.c                    | 14 ++++++--------
>   drivers/scsi/mpi3mr/mpi3mr_os.c         | 16 ++++------------
>   drivers/scsi/scsi_error.c               |  6 +++---
>   drivers/scsi/scsi_lib.c                 |  8 --------
>   drivers/scsi/scsi_priv.h                |  2 +-
>   include/linux/blk-mq.h                  | 10 ++++++++--
>   include/scsi/scsi_host.h                |  2 +-
>   30 files changed, 71 insertions(+), 98 deletions(-)
>