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From 33d075d8a2d5c6f22aaefb5fcfbee61e0c46586b Mon Sep 17 00:00:00 2001
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Message-Id: <33d075d8a2d5c6f22aaefb5fcfbee61e0c46586b.1389014116.git.minovotn@redhat.com>
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In-Reply-To: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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References: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 9 Dec 2013 14:09:10 +0100
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Subject: [PATCH 22/50] qemu-img: conditionally zero out target on convert
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-25-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56061
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 24/52] qemu-img: conditionally zero out target on convert
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Bugzilla: 1007815
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Peter Lieven <pl@kamp.de>
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If the target has_zero_init = 0, but supports efficiently
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writing zeroes by unmapping we call bdrv_make_zero to
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avoid fully allocating the target. This currently works
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only for iscsi. It can be extended to raw with
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BLKDISCARDZEROES for example.
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Peter Lieven <pl@kamp.de>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 5a37b60a61c4c334e3b194758871f41494317d42)
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---
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qemu-img.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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qemu-img.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/qemu-img.c b/qemu-img.c
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index dfd8a92..3dacbec 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -1353,7 +1353,7 @@ static int img_convert(int argc, char **argv)
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}
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}
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- flags = BDRV_O_RDWR;
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+ flags = min_sparse ? (BDRV_O_RDWR | BDRV_O_UNMAP) : BDRV_O_RDWR;
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ret = bdrv_parse_cache_flags(cache, &flags);
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if (ret < 0) {
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error_report("Invalid cache option: %s", cache);
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@@ -1469,6 +1469,14 @@ static int img_convert(int argc, char **argv)
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} else {
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int has_zero_init = min_sparse ? bdrv_has_zero_init(out_bs) : 0;
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+ if (!has_zero_init && bdrv_can_write_zeroes_with_unmap(out_bs)) {
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+ ret = bdrv_make_zero(out_bs, BDRV_REQ_MAY_UNMAP);
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+ if (ret < 0) {
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+ goto out;
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+ }
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+ has_zero_init = 1;
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+ }
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+
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sector_num = 0; // total number of sectors converted so far
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nb_sectors = total_sectors - sector_num;
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if (nb_sectors != 0) {
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--
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1.7.11.7
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