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From: Damien Le Moal <Damien.LeMoal@wdc.com>
To: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH v2 3/3] zonefs: document the explicit-open mount option
Date: Wed, 9 Sep 2020 12:52:20 +0000	[thread overview]
Message-ID: <CY4PR04MB37512BDD36767DD5C03594FDE7260@CY4PR04MB3751.namprd04.prod.outlook.com> (raw)
In-Reply-To: <20200909102614.40585-4-johannes.thumshirn@wdc.com>

On 2020/09/09 19:26, Johannes Thumshirn wrote:
> Document the newly introduced explicit-open mount option.
> 
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> 
> ---
> Changes to v1:
> - Address Randy's comments
> ---
>  Documentation/filesystems/zonefs.rst | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/Documentation/filesystems/zonefs.rst b/Documentation/filesystems/zonefs.rst
> index 6c18bc8ce332..6b213fe9a33e 100644
> --- a/Documentation/filesystems/zonefs.rst
> +++ b/Documentation/filesystems/zonefs.rst
> @@ -326,6 +326,21 @@ discover the amount of data that has been written to the zone. In the case of a
>  read-only zone discovered at run-time, as indicated in the previous section.
>  The size of the zone file is left unchanged from its last updated value.
>  
> +A zoned block device (e.g. an NVMe Zoned Namespace device) may have limits on
> +the number of zones that can be active, that is, zones that are in the
> +implicit open, explicit open or closed conditions.  This potential limitation
> +translates into a risk for applications to see write IO errors due to this
> +limit being exceeded if the zone of a file is not already active when a write
> +request is issued by the user.
> +
> +To avoid these potential errors, the "explicit-open" mount option forces zones
> +to be made active using an open zone command when a file is opened for writing
> +for the first time. If the zone open command succeeds, the application is then
> +guaranteed that write requests can be processed. Conversely, the
> +"explicit-open" mount option will result in a zone close command being issued
> +to the device on the last close() of a zone file if the zone is not full nor
> +empty.
> +
>  Zonefs User Space Tools
>  =======================
>  
> 

Looks good.

Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>

-- 
Damien Le Moal
Western Digital Research

  reply	other threads:[~2020-09-09 12:54 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-09 10:26 [PATCH v2 0/3] zonefs: introduce -o " Johannes Thumshirn
2020-09-09 10:26 ` [PATCH v2 1/3] zonefs: introduce helper for zone management Johannes Thumshirn
2020-09-09 12:43   ` Damien Le Moal
2020-09-09 14:43     ` Johannes Thumshirn
2020-09-09 10:26 ` [PATCH v2 2/3] zonefs: open/close zone on file open/close Johannes Thumshirn
2020-09-09 12:50   ` Damien Le Moal
2020-09-09 10:26 ` [PATCH v2 3/3] zonefs: document the explicit-open mount option Johannes Thumshirn
2020-09-09 12:52   ` Damien Le Moal [this message]
2020-09-09 12:52 ` [PATCH v2 0/3] zonefs: introduce -o " Damien Le Moal
2020-09-09 14:43   ` Johannes Thumshirn

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