From 06e8357157c82b57f86ea04ba2d782ddee0e09df Mon Sep 17 00:00:00 2001

From: John Snow <jsnow@redhat.com>

Date: Thu, 17 Jan 2019 19:11:10 +0000

Subject: [PATCH 13/14] qemu-img: Add -C option for convert with copy

 offloading

RH-Author: John Snow <jsnow@redhat.com>

Message-id: <20190117191111.30782-2-jsnow@redhat.com>

Patchwork-id: 84041

O-Subject: [RHEL8/rhel qemu-kvm PATCH 1/2] qemu-img: Add -C option for convert with copy offloading

Bugzilla: 1623082

RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

RH-Acked-by: Laurent Vivier <lvivier@redhat.com>

From: Fam Zheng <famz@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: John Snow <jsnow@redhat.com>

Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>

Conflicts:

  qemu-img-cmds.hx

  qemu-img.c

  qemu-img.texi

  All relating to downstream addition of -s

  argument not present when -C was added.

Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>

---

 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 b9bd401..f42750a 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