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quorum: Create BDRVQuorumState and BlkDriver and do init.

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Create the structure holding the quorum settings and write the minimal block
driver instanciation boilerplate.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Benoît Canet 2014-02-21 22:21:11 +01:00 committed by Kevin Wolf
parent 27cec15e4e
commit cadebd7a2a
1 changed files with 31 additions and 0 deletions
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31
block/quorum.c
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@ -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);