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| author | Johannes Thumshirn | 2020-09-11 17:56:51 +0900 |
|---|---|---|
| committer | Damien Le Moal | 2020-09-15 18:32:58 +0900 |
| commit | 48bfd5c6fac10e10b7066bf4aeb919ed9a4e87d3 (patch) | |
| tree | a88f651abcfcaaf350de4aff8f110f8f16bd8aa7 /Documentation/filesystems/zonefs.rst | |
| parent | b5c00e975779c3d9e6d530c5481309257d5e4220 (diff) | |
zonefs: document the explicit-open mount option
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>
Diffstat (limited to 'Documentation/filesystems/zonefs.rst')
| -rw-r--r-- | Documentation/filesystems/zonefs.rst | 15 |
1 files changed, 15 insertions, 0 deletions
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 ======================= |