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From d4702dc3b114f30be96a1a2b9fe4f7f05fef1fc0 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Wed, 4 Jul 2018 07:56:31 +0200
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Subject: [PATCH 176/268] qemu-img: Convert with copy offloading
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20180629061153.12687-11-famz@redhat.com>
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Patchwork-id: 81158
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH v2 10/13] qemu-img: Convert with copy offloading
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Bugzilla: 1482537
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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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The new blk_co_copy_range interface offers a more efficient way in the
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case of network based storage. Make use of it to allow faster convert
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operation.
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Since copy offloading cannot do zero detection ('-S') and compression
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(-c), only try it when these options are not used.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Message-id: 20180601092648.24614-11-famz@redhat.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit ee5306d0923377439776e8a30b9fd2de34b5cbfb)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 qemu-img.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++--
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 1 file changed, 48 insertions(+), 2 deletions(-)
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diff --git a/qemu-img.c b/qemu-img.c
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index 9fc8e66..b2ef54e 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -1561,6 +1561,7 @@ typedef struct ImgConvertState {
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     bool target_has_backing;
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     int64_t target_backing_sectors; /* negative if unknown */
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     bool wr_in_order;
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+    bool copy_range;
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     int min_sparse;
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     size_t cluster_sectors;
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     size_t buf_sectors;
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@@ -1765,6 +1766,37 @@ static int coroutine_fn convert_co_write(ImgConvertState *s, int64_t sector_num,
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     return 0;
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 }
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+static int coroutine_fn convert_co_copy_range(ImgConvertState *s, int64_t sector_num,
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+                                              int nb_sectors)
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+{
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+    int n, ret;
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+
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+    while (nb_sectors > 0) {
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+        BlockBackend *blk;
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+        int src_cur;
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+        int64_t bs_sectors, src_cur_offset;
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+        int64_t offset;
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+
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+        convert_select_part(s, sector_num, &src_cur, &src_cur_offset);
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+        offset = (sector_num - src_cur_offset) << BDRV_SECTOR_BITS;
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+        blk = s->src[src_cur];
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+        bs_sectors = s->src_sectors[src_cur];
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+
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+        n = MIN(nb_sectors, bs_sectors - (sector_num - src_cur_offset));
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+
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+        ret = blk_co_copy_range(blk, offset, s->target,
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+                                sector_num << BDRV_SECTOR_BITS,
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+                                n << BDRV_SECTOR_BITS, 0);
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+        if (ret < 0) {
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+            return ret;
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+        }
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+
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+        sector_num += n;
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+        nb_sectors -= n;
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+    }
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+    return 0;
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+}
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+
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 static void coroutine_fn convert_co_do_copy(void *opaque)
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 {
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     ImgConvertState *s = opaque;
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@@ -1787,6 +1819,7 @@ static void coroutine_fn convert_co_do_copy(void *opaque)
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         int n;
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         int64_t sector_num;
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         enum ImgConvertBlockStatus status;
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+        bool copy_range;
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         qemu_co_mutex_lock(&s->lock);
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         if (s->ret != -EINPROGRESS || s->sector_num >= s->total_sectors) {
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@@ -1816,7 +1849,9 @@ static void coroutine_fn convert_co_do_copy(void *opaque)
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                                         s->allocated_sectors, 0);
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         }
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-        if (status == BLK_DATA) {
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+retry:
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+        copy_range = s->copy_range && s->status == BLK_DATA;
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+        if (status == BLK_DATA && !copy_range) {
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             ret = convert_co_read(s, sector_num, n, buf);
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             if (ret < 0) {
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                 error_report("error while reading sector %" PRId64
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@@ -1838,7 +1873,15 @@ static void coroutine_fn convert_co_do_copy(void *opaque)
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         }
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         if (s->ret == -EINPROGRESS) {
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-            ret = convert_co_write(s, sector_num, n, buf, status);
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+            if (copy_range) {
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+                ret = convert_co_copy_range(s, sector_num, n);
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+                if (ret) {
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+                    s->copy_range = false;
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+                    goto retry;
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+                }
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+            } else {
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+                ret = convert_co_write(s, sector_num, n, buf, status);
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+            }
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             if (ret < 0) {
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                 error_report("error while writing sector %" PRId64
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                              ": %s", sector_num, strerror(-ret));
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@@ -1961,6 +2004,7 @@ static int img_convert(int argc, char **argv)
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     ImgConvertState s = (ImgConvertState) {
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         /* Need at least 4k of zeros for sparse detection */
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         .min_sparse         = 8,
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+        .copy_range         = true,
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         .buf_sectors        = IO_BUF_SIZE / BDRV_SECTOR_SIZE,
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         .wr_in_order        = true,
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         .num_coroutines     = 8,
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@@ -2001,6 +2045,7 @@ static int img_convert(int argc, char **argv)
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             break;
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         case 'c':
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             s.compressed = true;
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+            s.copy_range = false;
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             break;
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         case 'o':
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             if (!is_valid_option_list(optarg)) {
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@@ -2042,6 +2087,7 @@ static int img_convert(int argc, char **argv)
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             }
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             s.min_sparse = sval / BDRV_SECTOR_SIZE;
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+            s.copy_range = false;
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             break;
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         }
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         case 'p':
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-- 
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1.8.3.1
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