diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-10-05 18:35:26 +0200 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2016-10-24 17:56:06 +0200 |
| commit | 86ec252c198a62b3a1da3ac62277adf917d985cf (patch) | |
| tree | f52d46209dc13fab0d693179ef647d8784fdb9f5 /block/quorum.c | |
| parent | 12ac9d9e903e1a23d59aeb18d5eb50ddcf9ec975 (diff) | |
quorum: change child_iter to children_read
This simplifies a bit the code by using the usual C "inclusive start,
exclusive end" pattern for ranges.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1475685327-22767-2-git-send-email-pbonzini@redhat.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/quorum.c')
| -rw-r--r-- | block/quorum.c | 30 |
1 files changed, 13 insertions, 17 deletions
diff --git a/block/quorum.c b/block/quorum.c index 9cf876fb34..435296eef6 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -130,7 +130,7 @@ struct QuorumAIOCB { bool is_read; int vote_ret; - int child_iter; /* which child to read in fifo pattern */ + int children_read; /* how many children have been read from */ }; static bool quorum_vote(QuorumAIOCB *acb); @@ -165,8 +165,7 @@ static void quorum_aio_finalize(QuorumAIOCB *acb) acb->common.cb(acb->common.opaque, ret); if (acb->is_read) { - /* on the quorum case acb->child_iter == s->num_children - 1 */ - for (i = 0; i <= acb->child_iter; i++) { + for (i = 0; i < acb->children_read; i++) { qemu_vfree(acb->qcrs[i].buf); qemu_iovec_destroy(&acb->qcrs[i].qiov); } @@ -301,14 +300,13 @@ static void quorum_aio_cb(void *opaque, int ret) if (acb->is_read && s->read_pattern == QUORUM_READ_PATTERN_FIFO) { /* We try to read next child in FIFO order if we fail to read */ - if (ret < 0 && (acb->child_iter + 1) < s->num_children) { - acb->child_iter++; + if (ret < 0 && acb->children_read < s->num_children) { read_fifo_child(acb); return; } if (ret == 0) { - quorum_copy_qiov(acb->qiov, &acb->qcrs[acb->child_iter].qiov); + quorum_copy_qiov(acb->qiov, &acb->qcrs[acb->children_read - 1].qiov); } acb->vote_ret = ret; quorum_aio_finalize(acb); @@ -653,6 +651,7 @@ static BlockAIOCB *read_quorum_children(QuorumAIOCB *acb) BDRVQuorumState *s = acb->common.bs->opaque; int i; + acb->children_read = s->num_children; for (i = 0; i < s->num_children; i++) { acb->qcrs[i].buf = qemu_blockalign(s->children[i]->bs, acb->qiov->size); qemu_iovec_init(&acb->qcrs[i].qiov, acb->qiov->niov); @@ -671,16 +670,14 @@ static BlockAIOCB *read_quorum_children(QuorumAIOCB *acb) static BlockAIOCB *read_fifo_child(QuorumAIOCB *acb) { BDRVQuorumState *s = acb->common.bs->opaque; + int n = acb->children_read++; - acb->qcrs[acb->child_iter].buf = - qemu_blockalign(s->children[acb->child_iter]->bs, acb->qiov->size); - qemu_iovec_init(&acb->qcrs[acb->child_iter].qiov, acb->qiov->niov); - qemu_iovec_clone(&acb->qcrs[acb->child_iter].qiov, acb->qiov, - acb->qcrs[acb->child_iter].buf); - acb->qcrs[acb->child_iter].aiocb = - bdrv_aio_readv(s->children[acb->child_iter], acb->sector_num, - &acb->qcrs[acb->child_iter].qiov, acb->nb_sectors, - quorum_aio_cb, &acb->qcrs[acb->child_iter]); + acb->qcrs[n].buf = qemu_blockalign(s->children[n]->bs, acb->qiov->size); + qemu_iovec_init(&acb->qcrs[n].qiov, acb->qiov->niov); + qemu_iovec_clone(&acb->qcrs[n].qiov, acb->qiov, acb->qcrs[n].buf); + acb->qcrs[n].aiocb = bdrv_aio_readv(s->children[n], acb->sector_num, + &acb->qcrs[n].qiov, acb->nb_sectors, + quorum_aio_cb, &acb->qcrs[n]); return &acb->common; } @@ -696,13 +693,12 @@ static BlockAIOCB *quorum_aio_readv(BlockDriverState *bs, QuorumAIOCB *acb = quorum_aio_get(s, bs, qiov, sector_num, nb_sectors, cb, opaque); acb->is_read = true; + acb->children_read = 0; if (s->read_pattern == QUORUM_READ_PATTERN_QUORUM) { - acb->child_iter = s->num_children - 1; return read_quorum_children(acb); } - acb->child_iter = 0; return read_fifo_child(acb); } |