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[Qemu-devel] [PATCHv3 06/20] block: add BlockLimits structure to BlockDr
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv3 06/20] block: add BlockLimits structure to BlockDriverState |
Date: |
Tue, 24 Sep 2013 15:35:00 +0200 |
this patch adds BlockLimits which introduces discard and write_zeroes
limits and alignment information to the BlockDriverState.
Signed-off-by: Peter Lieven <address@hidden>
---
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
- [Qemu-devel] [PATCHv3 00/20] block: logical block provisioning enhancements, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 04/20] block: introduce bdrv_has_discard_zeroes and bdrv_has_discard_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 01/20] block: make BdrvRequestFlags public, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 02/20] block: add flags to bdrv_*_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 03/20] block: introduce BDRV_REQ_MAY_UNMAP request flag, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 05/20] block/raw: add bdrv_has_discard_zeroes and bdrv_has_discard_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 06/20] block: add BlockLimits structure to BlockDriverState,
Peter Lieven <=
- [Qemu-devel] [PATCHv3 07/20] block: honour BlockLimits in bdrv_co_do_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 08/20] block: honour BlockLimits in bdrv_co_discard, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 11/20] iscsi: add bdrv_has_discard_zeroes and bdrv_has_discard_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 13/20] block: introduce bdrv_zeroize, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 12/20] iscsi: add bdrv_co_write_zeroes, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 10/20] iscsi: set limits in BlockDriverState, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 14/20] block/get_block_status: set *pnum = 0 on error, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 09/20] iscsi: simplify iscsi_co_discard, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 16/20] block/get_block_status: avoid redundant callouts on raw devices, Peter Lieven, 2013/09/24
- [Qemu-devel] [PATCHv3 18/20] qemu-img: add support for fully allocated images, Peter Lieven, 2013/09/24