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[Qemu-devel] [PATCH V14 09/13] quorum: Add quorum_co_get_block_status.
From: |
Benoît Canet |
Subject: |
[Qemu-devel] [PATCH V14 09/13] quorum: Add quorum_co_get_block_status. |
Date: |
Mon, 3 Feb 2014 20:11:48 +0100 |
From: Benoît Canet <address@hidden>
Signed-off-by: Benoit Canet <address@hidden>
---
block/quorum.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/block/quorum.c b/block/quorum.c
index 4b726ba..6f7a40d 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -621,6 +621,56 @@ static void quorum_invalidate_cache(BlockDriverState *bs)
}
}
+static int64_t coroutine_fn quorum_co_get_block_status(BlockDriverState *bs,
+ int64_t sector_num,
+ int nb_sectors,
+ int *pnum)
+{
+ BDRVQuorumState *s = bs->opaque;
+ QuorumVoteVersion *winner = NULL;
+ QuorumVotes result_votes, num_votes;
+ QuorumVoteValue result_value, num_value;
+ int i, num;
+ int64_t result = 0;
+
+ QLIST_INIT(&result_votes.vote_list);
+ QLIST_INIT(&num_votes.vote_list);
+ result_votes.compare = quorum_64bits_compare;
+ num_votes.compare = quorum_64bits_compare;
+
+ for (i = 0; i < s->total; i++) {
+ result = bdrv_get_block_status(s->bs[i], sector_num, nb_sectors, &num);
+ /* skip failed requests */
+ if (result < 0) {
+ continue;
+ }
+ result_value.l = result & BDRV_BLOCK_DATA;
+ num_value.l = num;
+ quorum_count_vote(&result_votes, &result_value, i);
+ quorum_count_vote(&num_votes, &num_value, i);
+ }
+
+ winner = quorum_get_vote_winner(&result_votes);
+ if (winner->vote_count < s->threshold) {
+ result = -EIO;
+ goto free_exit;
+ }
+ result = winner->value.l;
+
+ winner = quorum_get_vote_winner(&num_votes);
+ if (winner->vote_count < s->threshold) {
+ result = -EIO;
+ goto free_exit;
+ }
+ *pnum = winner->value.l;
+
+free_exit:
+ quorum_free_vote_list(&result_votes);
+ quorum_free_vote_list(&num_votes);
+
+ return result;
+}
+
static BlockDriver bdrv_quorum = {
.format_name = "quorum",
.protocol_name = "quorum",
@@ -632,6 +682,7 @@ static BlockDriver bdrv_quorum = {
.bdrv_aio_readv = quorum_aio_readv,
.bdrv_aio_writev = quorum_aio_writev,
.bdrv_invalidate_cache = quorum_invalidate_cache,
+ .bdrv_co_get_block_status = quorum_co_get_block_status,
};
static void bdrv_quorum_init(void)
--
1.8.3.2
- [Qemu-devel] [PATCH V14 00/13] Quorum block filter, Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 02/13] quorum: Create BDRVQuorumState and BlkDriver and do init., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 03/13] quorum: Add quorum_aio_writev and its dependencies., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 01/13] quorum: Create quorum.c, add QuorumSingleAIOCB and QuorumAIOCB., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 04/13] blkverify: Extract qemu_iovec_clone() and qemu_iovec_compare() from blkverify., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 09/13] quorum: Add quorum_co_get_block_status.,
Benoît Canet <=
- [Qemu-devel] [PATCH V14 13/13] quorum: Add unit test., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 05/13] quorum: Add quorum_aio_readv., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 08/13] quorum: Add quorum_invalidate_cache()., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 06/13] quorum: Add quorum mechanism., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 07/13] quorum: Add quorum_getlength()., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V14 10/13] quorum: Add quorum_co_flush()., Benoît Canet, 2014/02/03