diff options
| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2018-06-09 18:17:56 +0300 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2018-06-21 09:23:58 -0500 |
| commit | 3d068aff16d6dbf066328977c5152847a62f2a0a (patch) | |
| tree | 58f7593ff7bc554196313a490e5103a9a3dfaea1 /include/block | |
| parent | b0769d8f8df0b51881f1f15c9e29722cf6191a43 (diff) | |
nbd/server: implement dirty bitmap export
Handle a new NBD meta namespace: "qemu", and corresponding queries:
"qemu:dirty-bitmap:<export bitmap name>".
With the new metadata context negotiated, BLOCK_STATUS query will reply
with dirty-bitmap data, converted to extents. The new public function
nbd_export_bitmap selects which bitmap to export. For now, only one bitmap
may be exported.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20180609151758.17343-5-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: wording tweaks, minor cleanups, additional tracing]
Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'include/block')
| -rw-r--r-- | include/block/nbd.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/block/nbd.h b/include/block/nbd.h index fcdcd54502..8bb9606c39 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -229,11 +229,13 @@ enum { #define NBD_REPLY_TYPE_ERROR NBD_REPLY_ERR(1) #define NBD_REPLY_TYPE_ERROR_OFFSET NBD_REPLY_ERR(2) -/* Flags for extents (NBDExtent.flags) of NBD_REPLY_TYPE_BLOCK_STATUS, - * for base:allocation meta context */ +/* Extent flags for base:allocation in NBD_REPLY_TYPE_BLOCK_STATUS */ #define NBD_STATE_HOLE (1 << 0) #define NBD_STATE_ZERO (1 << 1) +/* Extent flags for qemu:dirty-bitmap in NBD_REPLY_TYPE_BLOCK_STATUS */ +#define NBD_STATE_DIRTY (1 << 0) + static inline bool nbd_reply_type_is_error(int type) { return type & (1 << 15); @@ -315,6 +317,8 @@ void nbd_client_put(NBDClient *client); void nbd_server_start(SocketAddress *addr, const char *tls_creds, Error **errp); +void nbd_export_bitmap(NBDExport *exp, const char *bitmap, + const char *bitmap_export_name, Error **errp); /* nbd_read * Reads @size bytes from @ioc. Returns 0 on success. |