From fe81c2cca6dc69a5e423f6d8b235606b7f3ca7b7 Mon Sep 17 00:00:00 2001 From: Peter Lieven Date: Thu, 24 Oct 2013 12:06:56 +0200 Subject: [PATCH] block: add BlockLimits structure to BlockDriverState 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 d798208aff..95140b6ccf 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;