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charset="utf-8" In many cases the target of a convert operation is a newly provisioned target that the user knows is blank (filled with zeroes). In this situation there is no requirement for qemu-img to wastefully zero out the entire device. Add a new option, --target-is-zero, allowing the user to indicate that an existing target device is already zero filled. --- Apologies if this arrives twice - this From address wasn't subscribed the first time around. qemu-img.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/qemu-img.c b/qemu-img.c index 95a24b9762..56ca727e8c 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -70,6 +70,7 @@ enum { OPTION_PREALLOCATION =3D 265, OPTION_SHRINK =3D 266, OPTION_SALVAGE =3D 267, + OPTION_TARGET_IS_ZERO =3D 268, }; =20 typedef enum OutputFormat { @@ -1593,6 +1594,7 @@ typedef struct ImgConvertState { bool copy_range; bool salvage; bool quiet; + bool target_is_zero; int min_sparse; int alignment; size_t cluster_sectors; @@ -1984,10 +1986,11 @@ static int convert_do_copy(ImgConvertState *s) int64_t sector_num =3D 0; =20 /* Check whether we have zero initialisation or can get it efficiently= */ - if (s->target_is_new && s->min_sparse && !s->target_has_backing) { + s->has_zero_init =3D s->target_is_zero; + + if (!s->has_zero_init && s->target_is_new && s->min_sparse && + !s->target_has_backing) { s->has_zero_init =3D bdrv_has_zero_init(blk_bs(s->target)); - } else { - s->has_zero_init =3D false; } =20 if (!s->has_zero_init && !s->target_has_backing && @@ -2076,6 +2079,7 @@ static int img_convert(int argc, char **argv) .buf_sectors =3D IO_BUF_SIZE / BDRV_SECTOR_SIZE, .wr_in_order =3D true, .num_coroutines =3D 8, + .target_is_zero =3D false, }; =20 for(;;) { @@ -2086,6 +2090,7 @@ static int img_convert(int argc, char **argv) {"force-share", no_argument, 0, 'U'}, {"target-image-opts", no_argument, 0, OPTION_TARGET_IMAGE_OPTS= }, {"salvage", no_argument, 0, OPTION_SALVAGE}, + {"target-is-zero", no_argument, 0, OPTION_TARGET_IS_ZERO}, {0, 0, 0, 0} }; c =3D getopt_long(argc, argv, ":hf:O:B:Cco:l:S:pt:T:qnm:WU", @@ -2209,6 +2214,9 @@ static int img_convert(int argc, char **argv) case OPTION_TARGET_IMAGE_OPTS: tgt_image_opts =3D true; break; + case OPTION_TARGET_IS_ZERO: + s.target_is_zero =3D true; + break; } } =20 @@ -2247,6 +2255,11 @@ static int img_convert(int argc, char **argv) warn_report("This will become an error in future QEMU versions."); } =20 + if (s.target_is_zero && !skip_create) { + error_report("--target-is-zero requires use of -n flag"); + goto fail_getopt; + } + s.src_num =3D argc - optind - 1; out_filename =3D s.src_num >=3D 1 ? argv[argc - 1] : NULL; =20 --=20 2.24.1