From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:47420) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T1Ht3-0006jO-Q9 for qemu-devel@nongnu.org; Tue, 14 Aug 2012 10:14:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1T1Ht1-0004NM-8n for qemu-devel@nongnu.org; Tue, 14 Aug 2012 10:14:25 -0400 Received: from mail-wi0-f175.google.com ([209.85.212.175]:37307) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1T1Ht1-0004Lu-2N for qemu-devel@nongnu.org; Tue, 14 Aug 2012 10:14:23 -0400 Received: by mail-wi0-f175.google.com with SMTP id hm2so3454197wib.10 for ; Tue, 14 Aug 2012 07:14:22 -0700 (PDT) From: "=?UTF-8?q?Beno=C3=AEt=20Canet?=" Date: Tue, 14 Aug 2012 16:14:07 +0200 Message-Id: <1344953651-16622-6-git-send-email-benoit@irqsave.net> In-Reply-To: <1344953651-16622-1-git-send-email-benoit@irqsave.net> References: <1344953651-16622-1-git-send-email-benoit@irqsave.net> Subject: [Qemu-devel] [RFC V3 5/9] quorum: Add quorum_aio_writev and its dependencies. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, stefanha@linux.vnet.ibm.com, blauwirbel@gmail.com, anthony@codemonkey.ws, pbonzini@redhat.com, eblake@redhat.com, afaerber@suse.de, =?UTF-8?q?Beno=C3=AEt=20Canet?= Signed-off-by: Benoit Canet --- block/quorum.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 112 insertions(+) diff --git a/block/quorum.c b/block/quorum.c index a3f16ed..0a6647f 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -169,6 +169,116 @@ static int64_t quorum_getlength(BlockDriverState *bs) return bdrv_getlength(s->bs[0]); } +static void quorum_aio_cancel(BlockDriverAIOCB *blockacb) +{ + QuorumAIOCB *acb = container_of(blockacb, QuorumAIOCB, common); + bool finished = false; + + /* Wait for the request to finish */ + acb->finished = &finished; + while (!finished) { + qemu_aio_wait(); + } +} + +static AIOPool quorum_aio_pool = { + .aiocb_size = sizeof(QuorumAIOCB), + .cancel = quorum_aio_cancel, +}; + +static void quorum_aio_bh(void *opaque) +{ + QuorumAIOCB *acb = opaque; + BDRVQuorumState *s = acb->bqs; + int ret; + + ret = s->n <= acb->success_count ? 0 : -EIO; + + qemu_bh_delete(acb->bh); + acb->common.cb(acb->common.opaque, ret); + if (acb->finished) { + *acb->finished = true; + } + g_free(acb->aios); + g_free(acb->qiovs); + qemu_aio_release(acb); +} + +static QuorumAIOCB *quorum_aio_get(BDRVQuorumState *s, + BlockDriverState *bs, + QEMUIOVector *qiov, + int64_t sector_num, + int nb_sectors, + BlockDriverCompletionFunc *cb, + void *opaque) +{ + QuorumAIOCB *acb = qemu_aio_get(&quorum_aio_pool, bs, cb, opaque); + int i; + + acb->aios = g_new0(QuorumSingleAIOCB, s->m); + acb->qiovs = g_new0(QEMUIOVector, s->m); + + acb->bqs = s; + acb->qiov = qiov; + acb->bh = NULL; + acb->count = 0; + acb->success_count = 0; + acb->sector_num = sector_num; + acb->nb_sectors = nb_sectors; + acb->vote = NULL; + acb->vote_ret = 0; + + for (i = 0; i < s->m; i++) { + acb->aios[i].buf = NULL; + acb->aios[i].ret = 0; + acb->aios[i].parent = acb; + } + + return acb; +} + +static void quorum_aio_cb(void *opaque, int ret) +{ + QuorumSingleAIOCB *sacb = opaque; + QuorumAIOCB *acb = sacb->parent; + BDRVQuorumState *s = acb->bqs; + + sacb->ret = ret; + acb->count++; + if (ret == 0) { + acb->success_count += 1; + } + assert(acb->count <= s->m); + assert(acb->success_count <= s->m); + if (acb->count < s->m) { + return; + } + + acb->bh = qemu_bh_new(quorum_aio_bh, acb); + qemu_bh_schedule(acb->bh); +} + +static BlockDriverAIOCB *quorum_aio_writev(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].aiocb = bdrv_aio_writev(s->bs[i], sector_num, qiov, + nb_sectors, &quorum_aio_cb, + &acb->aios[i]); + } + + return &acb->common; +} + static BlockDriver bdrv_quorum = { .format_name = "quorum", .protocol_name = "quorum", @@ -179,6 +289,8 @@ static BlockDriver bdrv_quorum = { .bdrv_file_open = quorum_open, .bdrv_close = quorum_close, + + .bdrv_aio_writev = quorum_aio_writev, }; static void bdrv_quorum_init(void) -- 1.7.9.5