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Re: [Qemu-devel] [PATCHv4 1/2] qemu-img: find the image end offset durin
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From: |
Blue Swirl |
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Subject: |
Re: [Qemu-devel] [PATCHv4 1/2] qemu-img: find the image end offset during check |
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Date: |
Mon, 28 Jan 2013 20:22:55 +0000 |
On Mon, Jan 28, 2013 at 11:59 AM, Federico Simoncelli
<address@hidden> wrote:
> This patch adds the support for reporting the image end offset (in
> bytes). This is particularly useful after a conversion (or a rebase)
> where the destination is a block device in order to find the first
> unused byte at the end of the image.
>
> Signed-off-by: Federico Simoncelli <address@hidden>
> ---
> block/qcow2-refcount.c | 10 ++++++++--
> include/block/block.h | 1 +
> qemu-img.c | 4 ++++
> tests/qemu-iotests/026 | 6 +++---
> tests/qemu-iotests/036 | 3 ++-
> tests/qemu-iotests/039 | 2 +-
> tests/qemu-iotests/044.out | 1 +
> tests/qemu-iotests/common.rc | 5 +++--
> 8 files changed, 23 insertions(+), 9 deletions(-)
>
> diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
> index 6a95aa6..45ad043 100644
> --- a/block/qcow2-refcount.c
> +++ b/block/qcow2-refcount.c
> @@ -1116,7 +1116,7 @@ int qcow2_check_refcounts(BlockDriverState *bs,
> BdrvCheckResult *res,
> BdrvCheckMode fix)
> {
> BDRVQcowState *s = bs->opaque;
> - int64_t size, i;
> + int64_t size, i, highest_cluster;
> int nb_clusters, refcount1, refcount2;
> QCowSnapshot *sn;
> uint16_t *refcount_table;
> @@ -1187,7 +1187,7 @@ int qcow2_check_refcounts(BlockDriverState *bs,
> BdrvCheckResult *res,
> }
>
> /* compare ref counts */
> - for(i = 0; i < nb_clusters; i++) {
> + for(i = 0, highest_cluster = 0; i < nb_clusters; i++) {
Please add a space between 'for' and '('.
> refcount1 = get_refcount(bs, i);
> if (refcount1 < 0) {
> fprintf(stderr, "Can't get refcount for cluster %" PRId64 ":
> %s\n",
> @@ -1197,6 +1197,11 @@ int qcow2_check_refcounts(BlockDriverState *bs,
> BdrvCheckResult *res,
> }
>
> refcount2 = refcount_table[i];
> +
> + if (refcount1 > 0 || refcount2 > 0) {
> + highest_cluster = i;
> + }
> +
> if (refcount1 != refcount2) {
>
> /* Check if we're allowed to fix the mismatch */
> @@ -1231,6 +1236,7 @@ int qcow2_check_refcounts(BlockDriverState *bs,
> BdrvCheckResult *res,
> }
> }
>
> + res->image_end_offset = (highest_cluster + 1) * s->cluster_size;
> ret = 0;
>
> fail:
> diff --git a/include/block/block.h b/include/block/block.h
> index ffd1936..85eb3d9 100644
> --- a/include/block/block.h
> +++ b/include/block/block.h
> @@ -213,6 +213,7 @@ typedef struct BdrvCheckResult {
> int check_errors;
> int corruptions_fixed;
> int leaks_fixed;
> + int64_t image_end_offset;
> BlockFragInfo bfi;
> } BdrvCheckResult;
>
> diff --git a/qemu-img.c b/qemu-img.c
> index 85d3740..e80c1c5 100644
> --- a/qemu-img.c
> +++ b/qemu-img.c
> @@ -475,6 +475,10 @@ static int img_check(int argc, char **argv)
> result.bfi.fragmented_clusters * 100.0 /
> result.bfi.allocated_clusters);
> }
>
> + if (result.image_end_offset > 0) {
> + printf("Image end offset: %" PRId64 "\n", result.image_end_offset);
> + }
> +
> bdrv_delete(bs);
>
> if (ret < 0 || result.check_errors) {
> diff --git a/tests/qemu-iotests/026 b/tests/qemu-iotests/026
> index 1602ccd..107a3ff 100755
> --- a/tests/qemu-iotests/026
> +++ b/tests/qemu-iotests/026
> @@ -102,7 +102,7 @@ if [ "$event" == "l2_load" ]; then
> $QEMU_IO -c "read $vmstate 0 128k " $BLKDBG_TEST_IMG | _filter_qemu_io
> fi
>
> -$QEMU_IMG check $TEST_IMG 2>&1 | grep -v "refcount=1 reference=0"
> +_check_test_img 2>&1 | grep -v "refcount=1 reference=0"
>
> done
> done
> @@ -147,7 +147,7 @@ echo
> echo "Event: $event; errno: $errno; imm: $imm; once: $once; write $vmstate"
> $QEMU_IO -c "write $vmstate 0 64M" $BLKDBG_TEST_IMG | _filter_qemu_io
>
> -$QEMU_IMG check $TEST_IMG 2>&1 | grep -v "refcount=1 reference=0"
> +_check_test_img 2>&1 | grep -v "refcount=1 reference=0"
>
> done
> done
> @@ -186,7 +186,7 @@ echo
> echo "Event: $event; errno: $errno; imm: $imm; once: $once"
> $QEMU_IO -c "write -b 0 64k" $BLKDBG_TEST_IMG | _filter_qemu_io
>
> -$QEMU_IMG check $TEST_IMG 2>&1 | grep -v "refcount=1 reference=0"
> +_check_test_img 2>&1 | grep -v "refcount=1 reference=0"
>
> done
> done
> diff --git a/tests/qemu-iotests/036 b/tests/qemu-iotests/036
> index 329533e..4dbfc57 100755
> --- a/tests/qemu-iotests/036
> +++ b/tests/qemu-iotests/036
> @@ -59,7 +59,8 @@ _make_test_img 64M
> echo
> echo === Repair image ===
> echo
> -$QEMU_IMG check -r all $TEST_IMG
> +_check_test_img -r all
> +
> ./qcow2.py $TEST_IMG dump-header
>
> # success, all done
> diff --git a/tests/qemu-iotests/039 b/tests/qemu-iotests/039
> index c5ae806..ae35175 100755
> --- a/tests/qemu-iotests/039
> +++ b/tests/qemu-iotests/039
> @@ -86,7 +86,7 @@ $QEMU_IO -r -c "read -P 0x5a 0 512" $TEST_IMG |
> _filter_qemu_io
> echo
> echo "== Repairing the image file must succeed =="
>
> -$QEMU_IMG check -r all $TEST_IMG
> +_check_test_img -r all
>
> # The dirty bit must not be set
> ./qcow2.py $TEST_IMG dump-header | grep incompatible_features
> diff --git a/tests/qemu-iotests/044.out b/tests/qemu-iotests/044.out
> index 7a40071..9c48673 100644
> --- a/tests/qemu-iotests/044.out
> +++ b/tests/qemu-iotests/044.out
> @@ -1,4 +1,5 @@
> No errors were found on the image.
> +Image end offset: 4296447488
> .
> ----------------------------------------------------------------------
> Ran 1 tests
> diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
> index aef5f52..606d91e 100644
> --- a/tests/qemu-iotests/common.rc
> +++ b/tests/qemu-iotests/common.rc
> @@ -161,9 +161,10 @@ _cleanup_test_img()
>
> _check_test_img()
> {
> - $QEMU_IMG check -f $IMGFMT $TEST_IMG 2>&1 | \
> + $QEMU_IMG check "$@" -f $IMGFMT $TEST_IMG 2>&1 | \
> grep -v "fragmented$" | \
> - sed -e 's/qemu-img\: This image format does not support checks/No
> errors were found on the image./'
> + sed -e 's/qemu-img\: This image format does not support checks/No
> errors were found on the image./' | \
> + sed -e '/Image end offset: [0-9]\+/d'
> }
>
> _img_info()
> --
> 1.7.1
>
>