From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52762) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VOSnu-0004Ix-2w for qemu-devel@nongnu.org; Tue, 24 Sep 2013 09:37:31 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VOSno-0004wr-Dh for qemu-devel@nongnu.org; Tue, 24 Sep 2013 09:37:25 -0400 Received: from mx.ipv6.kamp.de ([2a02:248:0:51::16]:50353 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VOSno-0004wd-3O for qemu-devel@nongnu.org; Tue, 24 Sep 2013 09:37:20 -0400 From: Peter Lieven Date: Tue, 24 Sep 2013 15:35:00 +0200 Message-Id: <1380029714-5239-7-git-send-email-pl@kamp.de> In-Reply-To: <1380029714-5239-1-git-send-email-pl@kamp.de> References: <1380029714-5239-1-git-send-email-pl@kamp.de> Subject: [Qemu-devel] [PATCHv3 06/20] block: add BlockLimits structure to BlockDriverState List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, ronniesahlberg@gmail.com, Peter Lieven , stefanha@redhat.com, anthony@codemonkey.ws, pbonzini@redhat.com this patch adds BlockLimits which introduces discard and write_zeroes limits and alignment information to the BlockDriverState. Signed-off-by: Peter Lieven --- include/block/block_int.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/block/block_int.h b/include/block/block_int.h index cf78c3f..cda99f9 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -227,6 +227,20 @@ struct BlockDriver { QLIST_ENTRY(BlockDriver) list; }; +struct BlockLimits { + /* maximum number of sectors that can be discarded at once */ + int max_discard; + + /* optimal alignment for discard requests in sectors */ + int64_t discard_alignment; + + /* maximum number of sectors that can zeroized at once */ + int max_write_zeroes; + + /* optimal alignment for write zeroes requests in sectors */ + int64_t write_zeroes_alignment; +}; + /* * Note: the function bdrv_append() copies and swaps contents of * BlockDriverStates, so if you add new fields to this struct, please @@ -280,6 +294,9 @@ struct BlockDriverState { uint64_t total_time_ns[BDRV_MAX_IOTYPE]; uint64_t wr_highest_sector; + /* I/O Limits */ + struct BlockLimits bl; + /* Whether the disk can expand beyond total_sectors */ int growable; -- 1.7.9.5