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nbd/server: Refactor list of negotiated meta contexts

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Peform several minor refactorings of how the list of negotiated meta
contexts is managed, to make upcoming patches easier: Promote the
internal type NBDExportMetaContexts to the public opaque type
NBDMetaContexts, and mark exp const.  Use a shorter member name in
NBDClient.  Hoist calls to nbd_check_meta_context() earlier in their
callers, as the number of negotiated contexts may impact the flags
exposed in regards to an export, which in turn requires a new
parameter.  Drop a redundant parameter to nbd_negotiate_meta_queries.
No semantic change intended on the success path; on the failure path,
dropping context in nbd_check_meta_export even when reporting an error
is safer.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <20230925192229.3186470-24-eblake@redhat.com>
This commit is contained in:
Eric Blake
2023-09-25 14:22:40 -05:00
parent 56cf9d0471
commit fd358d8390
2 changed files with 31 additions and 25 deletions
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include/block/nbd.h
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@ -29,6 +29,7 @@
typedef struct NBDExport NBDExport;
typedef struct NBDClient NBDClient;
typedef struct NBDClientConnection NBDClientConnection;
typedef struct NBDMetaContexts NBDMetaContexts;
extern const BlockExportDriver blk_exp_nbd;