@@ -162,6 +162,10 @@ Parameters to convert subcommand:
.. program:: qemu-img-convert
+.. option:: --bitmaps
+
+ Additionally copy all persistent bitmaps from the top layer of the source
+
.. option:: -n
Skip the creation of the target volume
@@ -397,7 +401,7 @@ Command description:
4
Error on reading data
-.. option:: convert [--object OBJECTDEF] [--image-opts] [--target-image-opts] [--target-is-zero] [-U] [-C] [-c] [-p] [-q] [-n] [-f FMT] [-t CACHE] [-T SRC_CACHE] [-O OUTPUT_FMT] [-B BACKING_FILE] [-o OPTIONS] [-l SNAPSHOT_PARAM] [-S SPARSE_SIZE] [-m NUM_COROUTINES] [-W] FILENAME [FILENAME2 [...]] OUTPUT_FILENAME
+.. option:: convert [--object OBJECTDEF] [--image-opts] [--target-image-opts] [--target-is-zero] [--bitmaps] [-U] [-C] [-c] [-p] [-q] [-n] [-f FMT] [-t CACHE] [-T SRC_CACHE] [-O OUTPUT_FMT] [-B BACKING_FILE] [-o OPTIONS] [-l SNAPSHOT_PARAM] [-S SPARSE_SIZE] [-m NUM_COROUTINES] [-W] FILENAME [FILENAME2 [...]] OUTPUT_FILENAME
Convert the disk image *FILENAME* or a snapshot *SNAPSHOT_PARAM*
to disk image *OUTPUT_FILENAME* using format *OUTPUT_FMT*. It can
@@ -192,6 +192,7 @@ static void QEMU_NORETURN help(void)
" hiding corruption that has already occurred.\n"
"\n"
"Parameters to convert subcommand:\n"
+ " '--bitmaps' copies all top-level persistent bitmaps to destination\n"
" '-m' specifies how many coroutines work in parallel during the convert\n"
" process (defaults to 8)\n"
" '-W' allow to write to the target out of order rather than sequential\n"
@@ -2109,6 +2110,47 @@ static int convert_do_copy(ImgConvertState *s)
return s->ret;
}
+static int convert_copy_bitmaps(BlockDriverState *src, BlockDriverState *dst)
+{
+ BdrvDirtyBitmap *bm;
+ Error *err = NULL;
+ BlockDirtyBitmapMergeSource *merge;
+ BlockDirtyBitmapMergeSourceList *list;
+
+ FOR_EACH_DIRTY_BITMAP(src, bm) {
+ const char *name;
+
+ if (!bdrv_dirty_bitmap_get_persistence(bm)) {
+ continue;
+ }
+ name = bdrv_dirty_bitmap_name(bm);
+ qmp_block_dirty_bitmap_add(dst->node_name, name,
+ true, bdrv_dirty_bitmap_granularity(bm),
+ true, true,
+ true, !bdrv_dirty_bitmap_enabled(bm),
+ &err);
+ if (err) {
+ error_reportf_err(err, "Failed to create bitmap %s: ", name);
+ return -1;
+ }
+
+ merge = g_new0(BlockDirtyBitmapMergeSource, 1);
+ merge->type = QTYPE_QDICT;
+ merge->u.external.node = g_strdup(src->node_name);
+ merge->u.external.name = g_strdup(name);
+ list = g_new0(BlockDirtyBitmapMergeSourceList, 1);
+ list->value = merge;
+ qmp_block_dirty_bitmap_merge(dst->node_name, name, list, &err);
+ qapi_free_BlockDirtyBitmapMergeSourceList(list);
+ if (err) {
+ error_reportf_err(err, "Failed to populate bitmap %s: ", name);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
#define MAX_BUF_SECTORS 32768
static int img_convert(int argc, char **argv)
@@ -2130,6 +2172,8 @@ static int img_convert(int argc, char **argv)
int64_t ret = -EINVAL;
bool force_share = false;
bool explict_min_sparse = false;
+ bool bitmaps = false;
+ size_t nbitmaps = 0;
ImgConvertState s = (ImgConvertState) {
/* Need at least 4k of zeros for sparse detection */
@@ -2149,6 +2193,7 @@ static int img_convert(int argc, char **argv)
{"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},
+ {"bitmaps", no_argument, 0, OPTION_BITMAPS},
{0, 0, 0, 0}
};
c = getopt_long(argc, argv, ":hf:O:B:Cco:l:S:pt:T:qnm:WU",
@@ -2272,6 +2317,9 @@ static int img_convert(int argc, char **argv)
*/
s.has_zero_init = true;
break;
+ case OPTION_BITMAPS:
+ bitmaps = true;
+ break;
}
}
@@ -2333,7 +2381,6 @@ static int img_convert(int argc, char **argv)
goto fail_getopt;
}
-
/* ret is still -EINVAL until here */
ret = bdrv_parse_cache_mode(src_cache, &src_flags, &src_writethrough);
if (ret < 0) {
@@ -2493,6 +2540,27 @@ static int img_convert(int argc, char **argv)
}
}
+ /* Determine how many bitmaps need copying */
+ if (bitmaps) {
+ BdrvDirtyBitmap *bm;
+
+ if (s.src_num > 1) {
+ error_report("Copying bitmaps only possible with single source");
+ ret = -1;
+ goto out;
+ }
+ if (!bdrv_supports_persistent_dirty_bitmap(blk_bs(s.src[0]))) {
+ error_report("Source lacks bitmap support");
+ ret = -1;
+ goto out;
+ }
+ FOR_EACH_DIRTY_BITMAP(blk_bs(s.src[0]), bm) {
+ if (bdrv_dirty_bitmap_get_persistence(bm)) {
+ nbitmaps++;
+ }
+ }
+ }
+
/*
* The later open call will need any decryption secrets, and
* bdrv_create() will purge "opts", so extract them now before
@@ -2501,9 +2569,7 @@ static int img_convert(int argc, char **argv)
if (!skip_create) {
open_opts = qdict_new();
qemu_opt_foreach(opts, img_add_key_secrets, open_opts, &error_abort);
- }
- if (!skip_create) {
/* Create the new image */
ret = bdrv_create(drv, out_filename, opts, &local_err);
if (ret < 0) {
@@ -2541,6 +2607,13 @@ static int img_convert(int argc, char **argv)
}
out_bs = blk_bs(s.target);
+ if (nbitmaps > 0 && !bdrv_supports_persistent_dirty_bitmap(out_bs)) {
+ error_report("Format driver '%s' does not support bitmaps",
+ out_fmt);
+ ret = -1;
+ goto out;
+ }
+
if (s.compressed && !block_driver_can_compress(out_bs->drv)) {
error_report("Compression not supported for this file format");
ret = -1;
@@ -2600,6 +2673,12 @@ static int img_convert(int argc, char **argv)
}
ret = convert_do_copy(&s);
+
+ /* Now copy the bitmaps */
+ if (nbitmaps > 0 && ret == 0) {
+ ret = convert_copy_bitmaps(blk_bs(s.src[0]), out_bs);
+ }
+
out:
if (!ret) {
qemu_progress_print(100, 0);
@@ -46,9 +46,9 @@ SRST
ERST
DEF("convert", img_convert,
- "convert [--object objectdef] [--image-opts] [--target-image-opts] [--target-is-zero] [-U] [-C] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-B backing_file] [-o options] [-l snapshot_param] [-S sparse_size] [-m num_coroutines] [-W] [--salvage] filename [filename2 [...]] output_filename")
+ "convert [--object objectdef] [--image-opts] [--target-image-opts] [--target-is-zero] [--bitmaps] [-U] [-C] [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-B backing_file] [-o options] [-l snapshot_param] [-S sparse_size] [-m num_coroutines] [-W] [--salvage] filename [filename2 [...]] output_filename")
SRST
-.. option:: convert [--object OBJECTDEF] [--image-opts] [--target-image-opts] [--target-is-zero] [-U] [-C] [-c] [-p] [-q] [-n] [-f FMT] [-t CACHE] [-T SRC_CACHE] [-O OUTPUT_FMT] [-B BACKING_FILE] [-o OPTIONS] [-l SNAPSHOT_PARAM] [-S SPARSE_SIZE] [-m NUM_COROUTINES] [-W] [--salvage] FILENAME [FILENAME2 [...]] OUTPUT_FILENAME
+.. option:: convert [--object OBJECTDEF] [--image-opts] [--target-image-opts] [--target-is-zero] [--bitmaps] [-U] [-C] [-c] [-p] [-q] [-n] [-f FMT] [-t CACHE] [-T SRC_CACHE] [-O OUTPUT_FMT] [-B BACKING_FILE] [-o OPTIONS] [-l SNAPSHOT_PARAM] [-S SPARSE_SIZE] [-m NUM_COROUTINES] [-W] [--salvage] FILENAME [FILENAME2 [...]] OUTPUT_FILENAME
ERST
DEF("create", img_create,
Make it easier to copy all the persistent bitmaps of (the top layer of) a source image along with its guest-visible contents, by adding a boolean flag for use with qemu-img convert. This is basically shorthand, as the same effect could be accomplished with a series of 'qemu-img bitmap --add' and 'qemu-img bitmap --merge -b source' commands, or by QMP commands. Note that this command will fail in the same scenarios where 'qemu-img measure --bitmaps' fails, when either the source or the destanation lacks persistent bitmap support altogether. See also https://bugzilla.redhat.com/show_bug.cgi?id=1779893 While touching this, clean up a couple coding issues spotted in the same function: an extra blank line, and merging back-to-back 'if (!skip_create)' blocks. Signed-off-by: Eric Blake <eblake@redhat.com> --- docs/tools/qemu-img.rst | 6 ++- qemu-img.c | 85 +++++++++++++++++++++++++++++++++++++++-- qemu-img-cmds.hx | 4 +- 3 files changed, 89 insertions(+), 6 deletions(-)