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nbd: BLOCK_STATUS for standard get_block_status function: client part

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Minimal realization: only one extent in server answer is supported.
Flag NBD_CMD_FLAG_REQ_ONE is used to force this behavior.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20180312152126.286890-6-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: grammar tweaks, fix min_block check and 32-bit cap, use -1
instead of errno on failure in nbd_negotiate_simple_meta_context,
ensure that block status makes progress on success]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2018-03-12 18:21:23 +03:00 • committed by Eric Blake
parent 1e98efc029
commit 78a33ab587
5 changed files with 279 additions and 0 deletions
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3
block/nbd.c
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@ -585,6 +585,7 @@ static BlockDriver bdrv_nbd = {
.bdrv_detach_aio_context = nbd_detach_aio_context,
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
};
static BlockDriver bdrv_nbd_tcp = {
@ -604,6 +605,7 @@ static BlockDriver bdrv_nbd_tcp = {
.bdrv_detach_aio_context = nbd_detach_aio_context,
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
};
static BlockDriver bdrv_nbd_unix = {
@ -623,6 +625,7 @@ static BlockDriver bdrv_nbd_unix = {
.bdrv_detach_aio_context = nbd_detach_aio_context,
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
};
static void bdrv_nbd_init(void)