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nbd: Replace bool structured_reply with mode enum

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The upcoming patches for 64-bit extensions requires various points in
the protocol to make decisions based on what was negotiated.  While we
could easily add a 'bool extended_headers' alongside the existing
'bool structured_reply', this does not scale well if more modes are
added in the future.  Better is to expose the mode enum added in the
recent commit bfe04d0a7d out to a wider use in the code base.

Where the code previously checked for structured_reply being set or
clear, it now prefers checking for an inequality; this works because
the nodes are in a continuum of increasing abilities, and allows us to
touch fewer places if we ever insert other modes in the middle of the
enum.  There should be no semantic change in this patch.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20230829175826.377251-20-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
This commit is contained in:
Eric Blake 2023-08-29 12:58:28 -05:00
parent 71a5655a35
commit ac132d0520
6 changed files with 38 additions and 29 deletions
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2
include/block/nbd.h
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@ -305,7 +305,7 @@ typedef struct NBDExportInfo {
/* In-out fields, set by client before nbd_receive_negotiate() and
* updated by server results during nbd_receive_negotiate() */
bool structured_reply;
NBDMode mode; /* input maximum mode tolerated; output actual mode chosen */
bool base_allocation; /* base:allocation context for NBD_CMD_BLOCK_STATUS */
/* Set by server results during nbd_receive_negotiate() and