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From cf918fe08d1cf84f3825cea464c93278c647df52 Mon Sep 17 00:00:00 2001
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Message-Id: <cf918fe08d1cf84f3825cea464c93278c647df52.1389014116.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 14:09:09 +0100
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Subject: [PATCH 21/50] qemu-img: add support for fully allocated images
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-24-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56060
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 23/52] qemu-img: add support for fully allocated images
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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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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 11b6699af59b8684128debacfc7c44cbaa6ac53b)
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---
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qemu-img.c | 10 +++++++---
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qemu-img.texi | 6 ++++++
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2 files changed, 13 insertions(+), 3 deletions(-)
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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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qemu-img.texi | 6 ++++++
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2 files changed, 13 insertions(+), 3 deletions(-)
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diff --git a/qemu-img.c b/qemu-img.c
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index fa0fd0e..dfd8a92 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -99,8 +99,12 @@ static void help(void)
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" '-h' with or without a command shows this help and lists the supported formats\n"
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" '-p' show progress of command (only certain commands)\n"
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" '-q' use Quiet mode - do not print any output (except errors)\n"
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- " '-S' indicates the consecutive number of bytes that must contain only zeros\n"
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- " for qemu-img to create a sparse image during conversion\n"
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+ " '-S' indicates the consecutive number of bytes (defaults to 4k) that must\n"
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+ " contain only zeros for qemu-img to create a sparse image during\n"
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+ " conversion. If the number of bytes is 0, the source will not be scanned for\n"
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+ " unallocated or zero sectors, and the destination image will always be\n"
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+ " fully allocated\n"
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+ " images will always be fully allocated\n"
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" '--output' takes the format in which the output must be done (human or json)\n"
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" '-n' skips the target volume creation (useful if the volume is created\n"
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" prior to running qemu-img)\n"
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@@ -1463,7 +1467,7 @@ static int img_convert(int argc, char **argv)
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/* signal EOF to align */
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bdrv_write_compressed(out_bs, 0, NULL, 0);
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} else {
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- int has_zero_init = bdrv_has_zero_init(out_bs);
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+ int has_zero_init = min_sparse ? bdrv_has_zero_init(out_bs) : 0;
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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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diff --git a/qemu-img.texi b/qemu-img.texi
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index 43ee4eb..dc578bb 100644
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--- a/qemu-img.texi
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+++ b/qemu-img.texi
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@@ -193,6 +193,12 @@ Image conversion is also useful to get smaller image when using a
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growable format such as @code{qcow} or @code{cow}: the empty sectors
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are detected and suppressed from the destination image.
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+@var{sparse_size} indicates the consecutive number of bytes (defaults to 4k)
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+that must contain only zeros for qemu-img to create a sparse image during
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+conversion. If @var{sparse_size} is 0, the source will not be scanned for
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+unallocated or zero sectors, and the destination image will always be
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+fully allocated.
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+
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You can use the @var{backing_file} option to force the output image to be
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created as a copy on write image of the specified base image; the
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@var{backing_file} should have the same content as the input's base image,
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--
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1.7.11.7
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