linux-kernel - Re: [PATCH 1/4] block: add zone open, close and finish support

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Date:   Tue, 25 Jun 2019 18:53:34 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
Cc:     Bart Van Assche <bvanassche@....org>,
        "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Dmitry Fomichev <Dmitry.Fomichev@....com>,
        Ajay Joshi <Ajay.Joshi@....com>,
        Aravind Ramesh <Aravind.Ramesh@....com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "James.Bottomley@...senPartnership.com" 
        <James.Bottomley@...senpartnership.com>,
        "agk@...hat.com" <agk@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        Matias Bjorling <Matias.Bjorling@....com>
Subject: Re: [PATCH 1/4] block: add zone open, close and finish support

On Tue, Jun 25, 2019 at 6:51 PM Chaitanya Kulkarni
<Chaitanya.Kulkarni@....com> wrote:
>
> On 06/25/2019 08:56 AM, Bart Van Assche wrote:
> > On 6/25/19 3:35 AM, Matias Bjørling wrote:
> >> On 6/25/19 12:27 AM, Chaitanya Kulkarni wrote:
> >>> On 6/24/19 12:43 PM, Bart Van Assche wrote:
> >>>> static inline bool op_is_write(unsigned int op)
> >>>> {
> >>>>      return (op & 1);
> >>>> }
> >>>>
> >>>
> >>
> >> The zone mgmt commands are neither write nor reads commands. I guess,
> >> one could characterize them as write commands, but they don't write any
> >> data, they update a state of a zone on a drive. One should keep it as
> >> is? and make sure the zone mgmt commands don't get categorized as either
> >> read/write.
> >
> > Since the open, close and finish operations support modifying zone data
> > I propose to characterize these as write commands. How about the
> > following additional changes:
> > - Make bio_check_ro() refuse open/close/flush/reset zone operations for
>                                           ^
> Since finish also listed above which supports modifying data do we need
> to add finish here with flush in above line ?
>
> > read-only partitions (see also commit a32e236eb93e ("Partially revert
> > "block: fail op_is_write() requests to read-only partitions"") # v4.18).
> > - In submit_bio(), change op_is_write(bio_op(bio)) ? "WRITE" : "READ"
> > into something that uses blk_op_str().
> Good idea, I've a patch for blk_op_str() and debugfs just waiting for
> this to merge. Does it make sense to add that patch in this series ?

Ship it off separately. Your patches can go in first.

> > - Add open/close/flush zone support be added in blk_partition_remap().
> same here for finish ?
> >
> > Thanks,
> >
> > Bart.
> >
>