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From 1c16f135463077e596b9156439d2482a1a8aa9b8 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Fri, 18 Oct 2013 08:14:29 +0200
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Subject: [PATCH 04/81] block: keep bs->total_sectors up to date even for growable block devices
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1382084091-16636-5-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 54986
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 04/26] block: keep bs->total_sectors up to date even for growable block devices
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Bugzilla: 989646
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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If a BlockDriverState is growable, after every write we need to
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check if bs->total_sectors might have changed. With this change,
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bdrv_getlength does not need anymore a system call.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit df2a6f29a5019707d69f6eeb30cf792841cae5aa)
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---
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block.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block.c | 5 ++++-
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1 files changed, 4 insertions(+), 1 deletions(-)
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diff --git a/block.c b/block.c
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index 2ba9a0a..d5aeff7 100644
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--- a/block.c
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+++ b/block.c
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@@ -2703,6 +2703,9 @@ static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
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if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
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bs->wr_highest_sector = sector_num + nb_sectors - 1;
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}
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+ if (bs->growable && ret >= 0) {
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+ bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors);
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+ }
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tracked_request_end(&req;;
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@@ -2777,7 +2780,7 @@ int64_t bdrv_getlength(BlockDriverState *bs)
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if (!drv)
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return -ENOMEDIUM;
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- if (bs->growable || bdrv_dev_has_removable_media(bs)) {
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+ if (bdrv_dev_has_removable_media(bs)) {
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if (drv->bdrv_getlength) {
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return drv->bdrv_getlength(bs);
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}
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--
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1.7.1
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