nvmet: support configuring ANA groups

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Allow creating non-default ANA groups (group ID > 1).  Groups are created
either by assigning the group ID to a namespace, or by creating a configfs
group object under a specific port.  All namespaces assigned to a group
that doesn't have a configfs object for a given port are marked as
inaccessible.

Allow changing the ANA state on a per-port basis by creating an
ana_groups directory under each port, and another directory with an
ana_state file in it.  The default ANA group 1 directory is created
automatically for each port.

For all changes in ANA configuration the ANA change AEN is sent.  We only
keep a global changecount instead of additional per-group changecounts to
keep the implementation as simple as possible.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>

...

This commit is contained in:

Christoph Hellwig 2018-06-01 08:59:25 +02:00

parent 72efd25dcf

commit 62ac0d32f7

4 changed files with 236 additions and 4 deletions

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1

drivers/nvme/target/admin-cmd.c

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182

drivers/nvme/target/configfs.c

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27

drivers/nvme/target/core.c

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30

drivers/nvme/target/nvmet.h

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