diff options
| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2018-04-13 17:31:56 +0300 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2018-06-21 09:41:39 -0500 |
| commit | bc37b06a5cde24fb24c2a2cc44dd86756034ba9d (patch) | |
| tree | 9d3f3a1819a76c79d048858072ab3d0ce66be975 /include/block/nbd.h | |
| parent | 3229a835a3c574a8ebc605e007785c4e01c61623 (diff) | |
nbd/server: introduce NBD_CMD_CACHE
Handle nbd CACHE command. Just do read, without sending read data back.
Cache mechanism should be done by exported node driver chain.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20180413143156.11409-1-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: fix two missing case labels in switch statements]
Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'include/block/nbd.h')
| -rw-r--r-- | include/block/nbd.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/block/nbd.h b/include/block/nbd.h index 8bb9606c39..daaeae61bf 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -135,6 +135,7 @@ typedef struct NBDExtent { #define NBD_FLAG_SEND_TRIM (1 << 5) /* Send TRIM (discard) */ #define NBD_FLAG_SEND_WRITE_ZEROES (1 << 6) /* Send WRITE_ZEROES */ #define NBD_FLAG_SEND_DF (1 << 7) /* Send DF (Do not Fragment) */ +#define NBD_FLAG_SEND_CACHE (1 << 8) /* Send CACHE (prefetch) */ /* New-style handshake (global) flags, sent from server to client, and control what will happen during handshake phase. */ @@ -195,7 +196,7 @@ enum { NBD_CMD_DISC = 2, NBD_CMD_FLUSH = 3, NBD_CMD_TRIM = 4, - /* 5 reserved for failed experiment NBD_CMD_CACHE */ + NBD_CMD_CACHE = 5, NBD_CMD_WRITE_ZEROES = 6, NBD_CMD_BLOCK_STATUS = 7, }; |