[Qemu-devel] [RFC V3 8/9] quorum: Add quorum_aio_readv.

["Benoît Canet" <benoit.canet@gmail.com>]

Signed-off-by: Benoit Canet <benoit@irqsave.net>
---
 block/quorum.c |   35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/block/quorum.c b/block/quorum.c
index 86962b4..8b449fb 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -190,10 +190,16 @@ static void quorum_aio_bh(void *opaque)
 {
     QuorumAIOCB *acb = opaque;
     BDRVQuorumState *s = acb->bqs;
-    int ret;
+    int i, ret;
 
     ret = s->n <= acb->success_count ? 0 : -EIO;
 
+    for (i = 0; i < s->m; i++) {
+        qemu_vfree(acb->aios[i].buf);
+        acb->aios[i].buf = NULL;
+        acb->aios[i].ret = 0;
+    }
+
     qemu_bh_delete(acb->bh);
     acb->common.cb(acb->common.opaque, ret);
     if (acb->finished) {
@@ -258,6 +264,32 @@ static void quorum_aio_cb(void *opaque, int ret)
     qemu_bh_schedule(acb->bh);
 }
 
+static BlockDriverAIOCB *quorum_aio_readv(BlockDriverState *bs,
+                                         int64_t sector_num,
+                                         QEMUIOVector *qiov,
+                                         int nb_sectors,
+                                         BlockDriverCompletionFunc *cb,
+                                         void *opaque)
+{
+    BDRVQuorumState *s = bs->opaque;
+    QuorumAIOCB *acb = quorum_aio_get(s, bs, qiov, sector_num,
+                                      nb_sectors, cb, opaque);
+    int i;
+
+    for (i = 0; i < s->m; i++) {
+        acb->aios[i].buf = qemu_blockalign(bs->file, qiov->size);
+        qemu_iovec_init(&acb->qiovs[i], qiov->niov);
+        qemu_iovec_clone(&acb->qiovs[i], qiov, acb->aios[i].buf);
+    }
+
+    for (i = 0; i < s->m; i++) {
+        bdrv_aio_readv(s->bs[i], sector_num, qiov, nb_sectors,
+                       quorum_aio_cb, &acb->aios[i]);
+    }
+
+    return &acb->common;
+}
+
 static BlockDriverAIOCB *quorum_aio_writev(BlockDriverState *bs,
                                           int64_t sector_num,
                                           QEMUIOVector *qiov,
@@ -306,6 +338,7 @@ static BlockDriver bdrv_quorum = {
     .bdrv_close         = quorum_close,
     .bdrv_co_flush_to_disk = quorum_co_flush,
 
+    .bdrv_aio_readv     = quorum_aio_readv,
     .bdrv_aio_writev    = quorum_aio_writev,
 };
 
-- 
1.7.9.5