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quorum: Implement .bdrv_co_readv/writev
This converts the quorum block driver from implementing callback-based interfaces for read/write to coroutine-based ones. This is the first step that will allow us further simplification of the code. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com>
This commit is contained in:
Kevin Wolf
parent
10c8551968
commit
ce15dc08ef
194
block/quorum.c
194
block/quorum.c
@ -97,7 +97,7 @@ typedef struct QuorumAIOCB QuorumAIOCB;
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* $children_count QuorumChildRequest.
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*/
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typedef struct QuorumChildRequest {
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BlockAIOCB *aiocb;
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BlockDriverState *bs;
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QEMUIOVector qiov;
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uint8_t *buf;
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int ret;
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@ -110,7 +110,8 @@ typedef struct QuorumChildRequest {
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* used to do operations on each children and track overall progress.
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*/
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struct QuorumAIOCB {
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BlockAIOCB common;
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BlockDriverState *bs;
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Coroutine *co;
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/* Request metadata */
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uint64_t sector_num;
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@ -129,36 +130,23 @@ struct QuorumAIOCB {
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QuorumVotes votes;
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bool is_read;
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bool has_completed;
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int vote_ret;
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int children_read; /* how many children have been read from */
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};
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typedef struct QuorumCo {
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QuorumAIOCB *acb;
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int idx;
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} QuorumCo;
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static bool quorum_vote(QuorumAIOCB *acb);
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static void quorum_aio_cancel(BlockAIOCB *blockacb)
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{
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QuorumAIOCB *acb = container_of(blockacb, QuorumAIOCB, common);
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BDRVQuorumState *s = acb->common.bs->opaque;
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int i;
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/* cancel all callbacks */
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for (i = 0; i < s->num_children; i++) {
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if (acb->qcrs[i].aiocb) {
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bdrv_aio_cancel_async(acb->qcrs[i].aiocb);
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}
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}
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}
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static AIOCBInfo quorum_aiocb_info = {
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.aiocb_size = sizeof(QuorumAIOCB),
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.cancel_async = quorum_aio_cancel,
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};
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static void quorum_aio_finalize(QuorumAIOCB *acb)
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{
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acb->common.cb(acb->common.opaque, acb->vote_ret);
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acb->has_completed = true;
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g_free(acb->qcrs);
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qemu_aio_unref(acb);
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qemu_coroutine_enter_if_inactive(acb->co);
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}
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static bool quorum_sha256_compare(QuorumVoteValue *a, QuorumVoteValue *b)
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@ -174,14 +162,14 @@ static bool quorum_64bits_compare(QuorumVoteValue *a, QuorumVoteValue *b)
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static QuorumAIOCB *quorum_aio_get(BlockDriverState *bs,
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QEMUIOVector *qiov,
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uint64_t sector_num,
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int nb_sectors,
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BlockCompletionFunc *cb,
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void *opaque)
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int nb_sectors)
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{
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BDRVQuorumState *s = bs->opaque;
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QuorumAIOCB *acb = qemu_aio_get(&quorum_aiocb_info, bs, cb, opaque);
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QuorumAIOCB *acb = g_new(QuorumAIOCB, 1);
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int i;
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acb->co = qemu_coroutine_self();
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acb->bs = bs;
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acb->sector_num = sector_num;
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acb->nb_sectors = nb_sectors;
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acb->qiov = qiov;
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@ -191,6 +179,7 @@ static QuorumAIOCB *quorum_aio_get(BlockDriverState *bs,
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acb->rewrite_count = 0;
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acb->votes.compare = quorum_sha256_compare;
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QLIST_INIT(&acb->votes.vote_list);
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acb->has_completed = false;
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acb->is_read = false;
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acb->vote_ret = 0;
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@ -217,7 +206,7 @@ static void quorum_report_bad(QuorumOpType type, uint64_t sector_num,
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static void quorum_report_failure(QuorumAIOCB *acb)
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{
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const char *reference = bdrv_get_device_or_node_name(acb->common.bs);
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const char *reference = bdrv_get_device_or_node_name(acb->bs);
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qapi_event_send_quorum_failure(reference, acb->sector_num,
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acb->nb_sectors, &error_abort);
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}
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@ -226,7 +215,7 @@ static int quorum_vote_error(QuorumAIOCB *acb);
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static bool quorum_has_too_much_io_failed(QuorumAIOCB *acb)
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{
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BDRVQuorumState *s = acb->common.bs->opaque;
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BDRVQuorumState *s = acb->bs->opaque;
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if (acb->success_count < s->threshold) {
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acb->vote_ret = quorum_vote_error(acb);
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@ -252,7 +241,7 @@ static void quorum_rewrite_aio_cb(void *opaque, int ret)
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quorum_aio_finalize(acb);
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}
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static BlockAIOCB *read_fifo_child(QuorumAIOCB *acb);
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static int read_fifo_child(QuorumAIOCB *acb);
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static void quorum_copy_qiov(QEMUIOVector *dest, QEMUIOVector *source)
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{
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@ -272,14 +261,14 @@ static void quorum_report_bad_acb(QuorumChildRequest *sacb, int ret)
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QuorumAIOCB *acb = sacb->parent;
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QuorumOpType type = acb->is_read ? QUORUM_OP_TYPE_READ : QUORUM_OP_TYPE_WRITE;
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quorum_report_bad(type, acb->sector_num, acb->nb_sectors,
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sacb->aiocb->bs->node_name, ret);
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sacb->bs->node_name, ret);
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}
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static void quorum_fifo_aio_cb(void *opaque, int ret)
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static int quorum_fifo_aio_cb(void *opaque, int ret)
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{
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QuorumChildRequest *sacb = opaque;
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QuorumAIOCB *acb = sacb->parent;
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BDRVQuorumState *s = acb->common.bs->opaque;
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BDRVQuorumState *s = acb->bs->opaque;
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assert(acb->is_read && s->read_pattern == QUORUM_READ_PATTERN_FIFO);
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@ -288,8 +277,7 @@ static void quorum_fifo_aio_cb(void *opaque, int ret)
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/* We try to read next child in FIFO order if we fail to read */
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if (acb->children_read < s->num_children) {
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read_fifo_child(acb);
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return;
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return read_fifo_child(acb);
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}
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}
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@ -297,13 +285,14 @@ static void quorum_fifo_aio_cb(void *opaque, int ret)
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/* FIXME: rewrite failed children if acb->children_read > 1? */
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quorum_aio_finalize(acb);
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return ret;
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}
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static void quorum_aio_cb(void *opaque, int ret)
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{
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QuorumChildRequest *sacb = opaque;
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QuorumAIOCB *acb = sacb->parent;
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BDRVQuorumState *s = acb->common.bs->opaque;
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BDRVQuorumState *s = acb->bs->opaque;
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bool rewrite = false;
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int i;
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@ -518,7 +507,7 @@ static bool quorum_compare(QuorumAIOCB *acb,
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QEMUIOVector *a,
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QEMUIOVector *b)
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{
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BDRVQuorumState *s = acb->common.bs->opaque;
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BDRVQuorumState *s = acb->bs->opaque;
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ssize_t offset;
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/* This driver will replace blkverify in this particular case */
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@ -538,7 +527,7 @@ static bool quorum_compare(QuorumAIOCB *acb,
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/* Do a vote to get the error code */
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static int quorum_vote_error(QuorumAIOCB *acb)
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{
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BDRVQuorumState *s = acb->common.bs->opaque;
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BDRVQuorumState *s = acb->bs->opaque;
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QuorumVoteVersion *winner = NULL;
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QuorumVotes error_votes;
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QuorumVoteValue result_value;
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@ -573,7 +562,7 @@ static bool quorum_vote(QuorumAIOCB *acb)
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bool rewrite = false;
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int i, j, ret;
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QuorumVoteValue hash;
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BDRVQuorumState *s = acb->common.bs->opaque;
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BDRVQuorumState *s = acb->bs->opaque;
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QuorumVoteVersion *winner;
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if (quorum_has_too_much_io_failed(acb)) {
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@ -649,10 +638,25 @@ free_exit:
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return rewrite;
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}
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static BlockAIOCB *read_quorum_children(QuorumAIOCB *acb)
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static void read_quorum_children_entry(void *opaque)
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{
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BDRVQuorumState *s = acb->common.bs->opaque;
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int i;
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QuorumCo *co = opaque;
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QuorumAIOCB *acb = co->acb;
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BDRVQuorumState *s = acb->bs->opaque;
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int i = co->idx;
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int ret;
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acb->qcrs[i].bs = s->children[i]->bs;
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ret = bdrv_co_preadv(s->children[i], acb->sector_num * BDRV_SECTOR_SIZE,
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acb->nb_sectors * BDRV_SECTOR_SIZE,
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&acb->qcrs[i].qiov, 0);
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quorum_aio_cb(&acb->qcrs[i], ret);
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}
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static int read_quorum_children(QuorumAIOCB *acb)
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{
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BDRVQuorumState *s = acb->bs->opaque;
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int i, ret;
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acb->children_read = s->num_children;
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for (i = 0; i < s->num_children; i++) {
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@ -662,65 +666,99 @@ static BlockAIOCB *read_quorum_children(QuorumAIOCB *acb)
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}
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for (i = 0; i < s->num_children; i++) {
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acb->qcrs[i].aiocb = bdrv_aio_readv(s->children[i], acb->sector_num,
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&acb->qcrs[i].qiov, acb->nb_sectors,
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quorum_aio_cb, &acb->qcrs[i]);
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Coroutine *co;
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QuorumCo data = {
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.acb = acb,
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.idx = i,
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};
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co = qemu_coroutine_create(read_quorum_children_entry, &data);
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qemu_coroutine_enter(co);
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}
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return &acb->common;
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if (!acb->has_completed) {
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qemu_coroutine_yield();
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}
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ret = acb->vote_ret;
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return ret;
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}
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static BlockAIOCB *read_fifo_child(QuorumAIOCB *acb)
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static int read_fifo_child(QuorumAIOCB *acb)
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{
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BDRVQuorumState *s = acb->common.bs->opaque;
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BDRVQuorumState *s = acb->bs->opaque;
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int n = acb->children_read++;
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int ret;
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acb->qcrs[n].aiocb = bdrv_aio_readv(s->children[n], acb->sector_num,
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acb->qiov, acb->nb_sectors,
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quorum_fifo_aio_cb, &acb->qcrs[n]);
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acb->qcrs[n].bs = s->children[n]->bs;
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ret = bdrv_co_preadv(s->children[n], acb->sector_num * BDRV_SECTOR_SIZE,
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acb->nb_sectors * BDRV_SECTOR_SIZE, acb->qiov, 0);
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ret = quorum_fifo_aio_cb(&acb->qcrs[n], ret);
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return &acb->common;
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return ret;
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}
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static BlockAIOCB *quorum_aio_readv(BlockDriverState *bs,
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int64_t sector_num,
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QEMUIOVector *qiov,
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int nb_sectors,
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BlockCompletionFunc *cb,
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void *opaque)
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static int quorum_co_readv(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *qiov)
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{
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BDRVQuorumState *s = bs->opaque;
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QuorumAIOCB *acb = quorum_aio_get(bs, qiov, sector_num,
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nb_sectors, cb, opaque);
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QuorumAIOCB *acb = quorum_aio_get(bs, qiov, sector_num, nb_sectors);
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int ret;
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acb->is_read = true;
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acb->children_read = 0;
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if (s->read_pattern == QUORUM_READ_PATTERN_QUORUM) {
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return read_quorum_children(acb);
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ret = read_quorum_children(acb);
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} else {
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ret = read_fifo_child(acb);
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}
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return read_fifo_child(acb);
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g_free(acb);
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return ret;
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}
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static BlockAIOCB *quorum_aio_writev(BlockDriverState *bs,
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int64_t sector_num,
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QEMUIOVector *qiov,
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int nb_sectors,
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BlockCompletionFunc *cb,
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void *opaque)
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static void write_quorum_entry(void *opaque)
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{
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QuorumCo *co = opaque;
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QuorumAIOCB *acb = co->acb;
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BDRVQuorumState *s = acb->bs->opaque;
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int i = co->idx;
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int ret;
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acb->qcrs[i].bs = s->children[i]->bs;
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ret = bdrv_co_pwritev(s->children[i], acb->sector_num * BDRV_SECTOR_SIZE,
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acb->nb_sectors * BDRV_SECTOR_SIZE, acb->qiov, 0);
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quorum_aio_cb(&acb->qcrs[i], ret);
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}
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static int quorum_co_writev(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *qiov)
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{
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BDRVQuorumState *s = bs->opaque;
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QuorumAIOCB *acb = quorum_aio_get(bs, qiov, sector_num, nb_sectors,
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cb, opaque);
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int i;
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QuorumAIOCB *acb = quorum_aio_get(bs, qiov, sector_num, nb_sectors);
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int i, ret;
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for (i = 0; i < s->num_children; i++) {
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acb->qcrs[i].aiocb = bdrv_aio_writev(s->children[i], sector_num,
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qiov, nb_sectors, &quorum_aio_cb,
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&acb->qcrs[i]);
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Coroutine *co;
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QuorumCo data = {
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.acb = acb,
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.idx = i,
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};
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co = qemu_coroutine_create(write_quorum_entry, &data);
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qemu_coroutine_enter(co);
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}
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return &acb->common;
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if (!acb->has_completed) {
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qemu_coroutine_yield();
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}
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ret = acb->vote_ret;
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return ret;
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}
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static int64_t quorum_getlength(BlockDriverState *bs)
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@ -1097,8 +1135,8 @@ static BlockDriver bdrv_quorum = {
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.bdrv_getlength = quorum_getlength,
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.bdrv_aio_readv = quorum_aio_readv,
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.bdrv_aio_writev = quorum_aio_writev,
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.bdrv_co_readv = quorum_co_readv,
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.bdrv_co_writev = quorum_co_writev,
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.bdrv_add_child = quorum_add_child,
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.bdrv_del_child = quorum_del_child,
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