diff options
Diffstat (limited to 'block/quorum.c')
| -rw-r--r-- | block/quorum.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/block/quorum.c b/block/quorum.c index 950f5cc990..375ffd5963 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); |