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zonefs: document the explicit-open mount option

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Document the newly introduced explicit-open mount option.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
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Johannes Thumshirn 2020-09-11 17:56:51 +09:00 committed by Damien Le Moal
parent b5c00e9757
commit 48bfd5c6fa
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Documentation/filesystems/zonefs.rst
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@ -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
=======================