From cadebd7a2a590c2ac5ced58c2fc207c7ae78fb1b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Beno=C3=AEt=20Canet?= Date: Fri, 21 Feb 2014 22:21:11 +0100 Subject: quorum: Create BDRVQuorumState and BlkDriver and do init. Create the structure holding the quorum settings and write the minimal block driver instanciation boilerplate. Signed-off-by: Benoit Canet Reviewed-by: Max Reitz Signed-off-by: Kevin Wolf --- block/quorum.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'block/quorum.c') diff --git a/block/quorum.c b/block/quorum.c index 950f5cc..375ffd5 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -15,6 +15,23 @@ #include "block/block_int.h" +/* the following structure holds the state of one quorum instance */ +typedef struct BDRVQuorumState { + BlockDriverState **bs; /* children BlockDriverStates */ + int num_children; /* children count */ + int threshold; /* if less than threshold children reads gave the + * same result a quorum error occurs. + */ + bool is_blkverify; /* true if the driver is in blkverify mode + * Writes are mirrored on two children devices. + * On reads the two children devices' contents are + * compared and if a difference is spotted its + * location is printed and the code aborts. + * It is useful to debug other block drivers by + * comparing them with a reference one. + */ +} BDRVQuorumState; + typedef struct QuorumAIOCB QuorumAIOCB; /* Quorum will create one instance of the following structure per operation it @@ -51,3 +68,17 @@ struct QuorumAIOCB { bool is_read; int vote_ret; }; + +static BlockDriver bdrv_quorum = { + .format_name = "quorum", + .protocol_name = "quorum", + + .instance_size = sizeof(BDRVQuorumState), +}; + +static void bdrv_quorum_init(void) +{ + bdrv_register(&bdrv_quorum); +} + +block_init(bdrv_quorum_init); -- cgit v1.1