From 1eae92fe23ff0e5ba28374220417a44920192ee4 Mon Sep 17 00:00:00 2001 Message-Id: <1eae92fe23ff0e5ba28374220417a44920192ee4.1389014116.git.minovotn@redhat.com> In-Reply-To: References: From: Paolo Bonzini Date: Mon, 9 Dec 2013 14:08:57 +0100 Subject: [PATCH 09/50] block: add logical block provisioning info to BlockDriverInfo RH-Author: Paolo Bonzini Message-id: <1386598178-11845-12-git-send-email-pbonzini@redhat.com> Patchwork-id: 56051 O-Subject: [RHEL 7.0 qemu-kvm PATCH 11/52] block: add logical block provisioning info to BlockDriverInfo Bugzilla: 1007815 RH-Acked-by: Jeffrey Cody RH-Acked-by: Fam Zheng RH-Acked-by: Stefan Hajnoczi From: Peter Lieven Reviewed-by: Eric Blake Signed-off-by: Peter Lieven Signed-off-by: Stefan Hajnoczi (cherry picked from commit e1a5c4bed44bc23f69f53883c657e31e150cab30) --- include/block/block.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) Signed-off-by: Michal Novotny --- include/block/block.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/block/block.h b/include/block/block.h index 10abc00..ab3044e 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -18,6 +18,22 @@ typedef struct BlockDriverInfo { /* offset at which the VM state can be saved (0 if not possible) */ int64_t vm_state_offset; bool is_dirty; + /* + * True if unallocated blocks read back as zeroes. This is equivalent + * to the the LBPRZ flag in the SCSI logical block provisioning page. + */ + bool unallocated_blocks_are_zero; + /* + * True if the driver can optimize writing zeroes by unmapping + * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux + * with the difference that in qemu a discard is allowed to silently + * fail. Therefore we have to use bdrv_write_zeroes with the + * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. + * After this call the driver has to guarantee that the contents read + * back as zero. It is additionally required that the block device is + * opened with BDRV_O_UNMAP flag for this to work. + */ + bool can_write_zeroes_with_unmap; } BlockDriverInfo; typedef struct BlockFragInfo { -- 1.7.11.7