From 2d72f0886af14ab032974dd228e1c55e1501f117 Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Wed, 1 Aug 2018 06:35:37 +0200
Subject: [PATCH 01/13] qemu-img: Add -C option for convert with copy
offloading
RH-Author: Fam Zheng <famz@redhat.com>
Message-id: <20180801063538.32582-2-famz@redhat.com>
Patchwork-id: 81560
O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 1/2] qemu-img: Add -C option for convert with copy offloading
Bugzilla: 1607774
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: John Snow <jsnow@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit e11ce12f5eb26438419e486a3ae2c9bb58a23c1f)
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Conflicts:
qemu-img-cmds.hx
qemu-img.texi
qemu-img.c
All contextual conflicts.
1) Downstream doesn't have 46e8d272ba (qemu-img: Remove deprecated -s
snapshot_id_or_name option).
2) Downstream doesn't have 88481329c0 (qemu-img: allow compressed
not-in-order writes).
---
qemu-img-cmds.hx | 2 +-
qemu-img.c | 21 +++++++++++++++++----
qemu-img.texi | 8 +++++++-
3 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/qemu-img-cmds.hx b/qemu-img-cmds.hx
index 2fe3189..48815c0 100644
--- a/qemu-img-cmds.hx
+++ b/qemu-img-cmds.hx
@@ -41,7 +41,7 @@ STEXI
ETEXI
DEF("convert", img_convert,
- "convert [--object objectdef] [--image-opts] [--target-image-opts] [-U] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-B backing_file] [-o options] [-s snapshot_id_or_name] [-l snapshot_param] [-S sparse_size] [-m num_coroutines] [-W] filename [filename2 [...]] output_filename")
+ "convert [--object objectdef] [--image-opts] [--target-image-opts] [-U] [-C] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-B backing_file] [-o options] [-s snapshot_id_or_name] [-l snapshot_param] [-S sparse_size] [-m num_coroutines] [-W] filename [filename2 [...]] output_filename")
STEXI
@item convert [--object @var{objectdef}] [--image-opts] [--target-image-opts] [-U] [-c] [-p] [-q] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-S @var{sparse_size}] [-m @var{num_coroutines}] [-W] @var{filename} [@var{filename2} [...]] @var{output_filename}
ETEXI
diff --git a/qemu-img.c b/qemu-img.c
index eaee6d6..c9ccc1e 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2000,11 +2000,12 @@ static int img_convert(int argc, char **argv)
skip_create = false, progress = false, tgt_image_opts = false;
int64_t ret = -EINVAL;
bool force_share = false;
+ bool explict_min_sparse = false;
ImgConvertState s = (ImgConvertState) {
/* Need at least 4k of zeros for sparse detection */
.min_sparse = 8,
- .copy_range = true,
+ .copy_range = false,
.buf_sectors = IO_BUF_SIZE / BDRV_SECTOR_SIZE,
.wr_in_order = true,
.num_coroutines = 8,
@@ -2019,7 +2020,7 @@ static int img_convert(int argc, char **argv)
{"target-image-opts", no_argument, 0, OPTION_TARGET_IMAGE_OPTS},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, ":hf:O:B:co:s:l:S:pt:T:qnm:WU",
+ c = getopt_long(argc, argv, ":hf:O:B:Cco:s:l:S:pt:T:qnm:WU",
long_options, NULL);
if (c == -1) {
break;
@@ -2043,9 +2044,11 @@ static int img_convert(int argc, char **argv)
case 'B':
out_baseimg = optarg;
break;
+ case 'C':
+ s.copy_range = true;
+ break;
case 'c':
s.compressed = true;
- s.copy_range = false;
break;
case 'o':
if (!is_valid_option_list(optarg)) {
@@ -2087,7 +2090,7 @@ static int img_convert(int argc, char **argv)
}
s.min_sparse = sval / BDRV_SECTOR_SIZE;
- s.copy_range = false;
+ explict_min_sparse = true;
break;
}
case 'p':
@@ -2152,6 +2155,16 @@ static int img_convert(int argc, char **argv)
goto fail_getopt;
}
+ if (s.compressed && s.copy_range) {
+ error_report("Cannot enable copy offloading when -c is used");
+ goto fail_getopt;
+ }
+
+ if (explict_min_sparse && s.copy_range) {
+ error_report("Cannot enable copy offloading when -S is used");
+ goto fail_getopt;
+ }
+
if (tgt_image_opts && !skip_create) {
error_report("--target-image-opts requires use of -n flag");
goto fail_getopt;
diff --git a/qemu-img.texi b/qemu-img.texi
index 8a26400..74d7290 100644
--- a/qemu-img.texi
+++ b/qemu-img.texi
@@ -172,6 +172,12 @@ Number of parallel coroutines for the convert process
Allow out-of-order writes to the destination. This option improves performance,
but is only recommended for preallocated devices like host devices or other
raw block devices.
+@item -C
+Try to use copy offloading to move data from source image to target. This may
+improve performance if the data is remote, such as with NFS or iSCSI backends,
+but will not automatically sparsify zero sectors, and may result in a fully
+allocated target image depending on the host support for getting allocation
+information.
@end table
Parameters to dd subcommand:
@@ -340,7 +346,7 @@ Error on reading data
@end table
-@item convert [-c] [-p] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-m @var{num_coroutines}] [-W] [-S @var{sparse_size}] @var{filename} [@var{filename2} [...]] @var{output_filename}
+@item convert [-C] [-c] [-p] [-n] [-f @var{fmt}] [-t @var{cache}] [-T @var{src_cache}] [-O @var{output_fmt}] [-B @var{backing_file}] [-o @var{options}] [-s @var{snapshot_id_or_name}] [-l @var{snapshot_param}] [-m @var{num_coroutines}] [-W] [-S @var{sparse_size}] @var{filename} [@var{filename2} [...]] @var{output_filename}
Convert the disk image @var{filename} or a snapshot @var{snapshot_param}(@var{snapshot_id_or_name} is deprecated)
to disk image @var{output_filename} using format @var{output_fmt}. It can be optionally compressed (@code{-c}
--
1.8.3.1