From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53777) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VmRD8-0003eb-Dt for qemu-devel@nongnu.org; Fri, 29 Nov 2013 11:46:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VmRD3-0002nb-B2 for qemu-devel@nongnu.org; Fri, 29 Nov 2013 11:46:34 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57951) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VmRD3-0002nO-2y for qemu-devel@nongnu.org; Fri, 29 Nov 2013 11:46:29 -0500 From: Kevin Wolf Date: Fri, 29 Nov 2013 17:45:22 +0100 Message-Id: <1385743555-27888-8-git-send-email-kwolf@redhat.com> In-Reply-To: <1385743555-27888-1-git-send-email-kwolf@redhat.com> References: <1385743555-27888-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 07/41] block: add BlockLimits structure to BlockDriverState List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: anthony@codemonkey.ws Cc: kwolf@redhat.com, qemu-devel@nongnu.org From: Peter Lieven this patch adds BlockLimits which introduces discard and write_zeroes limits and alignment information to the BlockDriverState. Signed-off-by: Peter Lieven Signed-off-by: Stefan Hajnoczi --- 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 d798208..95140b6 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -230,6 +230,20 @@ struct BlockDriver { QLIST_ENTRY(BlockDriver) list; }; +typedef 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; +} BlockLimits; + /* * Note: the function bdrv_append() copies and swaps contents of * BlockDriverStates, so if you add new fields to this struct, please @@ -283,6 +297,9 @@ struct BlockDriverState { uint64_t total_time_ns[BDRV_MAX_IOTYPE]; uint64_t wr_highest_sector; + /* I/O Limits */ + BlockLimits bl; + /* Whether the disk can expand beyond total_sectors */ int growable; -- 1.8.1.4