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From c4d49803aeb1d6304c2728cb1475f8314ae1f8a8 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Mon, 6 May 2019 17:56:22 +0200
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Subject: [PATCH 12/53] block: Add bdrv_get_request_alignment()
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20190506175629.11079-13-jsnow@redhat.com>
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Patchwork-id: 87195
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O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 12/19] block: Add bdrv_get_request_alignment()
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Bugzilla: 1692018
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Eric Blake <eblake@redhat.com>
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The next patch needs access to a device's minimum permitted
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alignment, since NBD wants to advertise this to clients. Add
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an accessor function, borrowing from blk_get_max_transfer()
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for accessing a backend's block limits.
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Message-Id: <20190329042750.14704-6-eblake@redhat.com>
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(cherry picked from commit 4841211e0d1628cd386b35835676d7f6f9a4fa9d)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/block-backend.c | 7 +++++++
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include/sysemu/block-backend.h | 1 +
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2 files changed, 8 insertions(+)
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diff --git a/block/block-backend.c b/block/block-backend.c
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index 52eebeb..f6480f6 100644
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--- a/block/block-backend.c
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+++ b/block/block-backend.c
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@@ -1834,6 +1834,13 @@ int blk_get_flags(BlockBackend *blk)
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}
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}
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+/* Returns the minimum request alignment, in bytes; guaranteed nonzero */
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+uint32_t blk_get_request_alignment(BlockBackend *blk)
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+{
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+ BlockDriverState *bs = blk_bs(blk);
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+ return bs ? bs->bl.request_alignment : BDRV_SECTOR_SIZE;
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+}
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+
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/* Returns the maximum transfer length, in bytes; guaranteed nonzero */
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uint32_t blk_get_max_transfer(BlockBackend *blk)
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{
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diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
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index 6b6d882..815b6e5 100644
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--- a/include/sysemu/block-backend.h
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+++ b/include/sysemu/block-backend.h
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@@ -178,6 +178,7 @@ bool blk_is_available(BlockBackend *blk);
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void blk_lock_medium(BlockBackend *blk, bool locked);
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void blk_eject(BlockBackend *blk, bool eject_flag);
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int blk_get_flags(BlockBackend *blk);
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+uint32_t blk_get_request_alignment(BlockBackend *blk);
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uint32_t blk_get_max_transfer(BlockBackend *blk);
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int blk_get_max_iov(BlockBackend *blk);
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void blk_set_guest_block_size(BlockBackend *blk, int align);
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--
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1.8.3.1
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