Received: from eggs.gnu.org ([2001:4830:134:3::10]:47854) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XYr36-0006EC-0D for qemu-devel@nongnu.org; Tue, 30 Sep 2014 02:36:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XYr30-00054h-BI for qemu-devel@nongnu.org; Tue, 30 Sep 2014 02:36:35 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:37946 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XYr30-00052F-1m for qemu-devel@nongnu.org; Tue, 30 Sep 2014 02:36:30 -0400 From: Peter Lieven Date: Tue, 30 Sep 2014 08:35:17 +0200 Message-Id: <1412058919-13209-2-git-send-email-pl@kamp.de> In-Reply-To: <1412058919-13209-1-git-send-email-pl@kamp.de> References: <1412058919-13209-1-git-send-email-pl@kamp.de> Subject: [Qemu-devel] [PATCHv3 1/3] BlockLimits: introduce max_transfer_length List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, benoit.canet@irqsave.net, stefanha@redhat.com, Peter Lieven , mreitz@redhat.com, ronniesahlberg@gmail.com, pbonzini@redhat.com Signed-off-by: Peter Lieven Reviewed-by: Ronnie Sahlberg --- block.c | 4 ++++ include/block/block_int.h | 3 +++ 2 files changed, 7 insertions(+) diff --git a/block.c b/block.c index c5a251c..26806e0 100644 --- a/block.c +++ b/block.c @@ -541,6 +541,7 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) return; } bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; + bs->bl.max_transfer_length = bs->file->bl.max_transfer_length; bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; } else { bs->bl.opt_mem_alignment = 512; @@ -555,6 +556,9 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) bs->bl.opt_transfer_length = MAX(bs->bl.opt_transfer_length, bs->backing_hd->bl.opt_transfer_length); + bs->bl.max_transfer_length = + MIN(bs->bl.max_transfer_length, + bs->backing_hd->bl.max_transfer_length); bs->bl.opt_mem_alignment = MAX(bs->bl.opt_mem_alignment, bs->backing_hd->bl.opt_mem_alignment); diff --git a/include/block/block_int.h b/include/block/block_int.h index 8d86a6c..b13a10a 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -289,6 +289,9 @@ typedef struct BlockLimits { /* optimal transfer length in sectors */ int opt_transfer_length; + /* maximal transfer length in sectors */ + int max_transfer_length; + /* memory alignment so that no bounce buffer is needed */ size_t opt_mem_alignment; } BlockLimits; -- 1.7.9.5