diff options
author | Max Reitz <mreitz@redhat.com> | 2015-07-27 17:51:40 +0200 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2015-12-18 14:34:43 +0100 |
commit | e9dbdc5e46054c4660b4c4f705ce8ff6aeb4959b (patch) | |
tree | 9708fae8323cd794462ac25c8c643151e7b32979 /tests/qemu-iotests/112 | |
parent | 03bb78ed250874f76e0854aa4d5d95af1e12613e (diff) |
iotests: Extend test 112 for qemu-img amend
Add tests for conversion between different refcount widths.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'tests/qemu-iotests/112')
-rwxr-xr-x | tests/qemu-iotests/112 | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/tests/qemu-iotests/112 b/tests/qemu-iotests/112 index 3f054a3fcd..34ba06acd6 100755 --- a/tests/qemu-iotests/112 +++ b/tests/qemu-iotests/112 @@ -180,6 +180,115 @@ $QEMU_IMG snapshot -c foo "$TEST_IMG" # leaked (refcount=UINT64_MAX reference=1) _check_test_img +echo +echo '=== Amend from refcount_bits=16 to refcount_bits=1 ===' +echo + +_make_test_img 64M +print_refcount_bits + +$QEMU_IO -c 'write 16M 32M' "$TEST_IMG" | _filter_qemu_io +$QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG" +_check_test_img +print_refcount_bits + +echo +echo '=== Amend from refcount_bits=1 to refcount_bits=64 ===' +echo + +$QEMU_IMG amend -o refcount_bits=64 "$TEST_IMG" +_check_test_img +print_refcount_bits + +echo +echo '=== Amend to compat=0.10 ===' +echo + +# Should not work because refcount_bits needs to be 16 for compat=0.10 +$QEMU_IMG amend -o compat=0.10 "$TEST_IMG" +print_refcount_bits +# Should work +$QEMU_IMG amend -o compat=0.10,refcount_bits=16 "$TEST_IMG" +_check_test_img +print_refcount_bits + +# Get back to compat=1.1 and refcount_bits=16 +$QEMU_IMG amend -o compat=1.1 "$TEST_IMG" +print_refcount_bits +# Should not work +$QEMU_IMG amend -o refcount_bits=32,compat=0.10 "$TEST_IMG" +print_refcount_bits + +echo +echo '=== Amend with snapshot ===' +echo + +$QEMU_IMG snapshot -c foo "$TEST_IMG" +# Just to have different refcounts across the image +$QEMU_IO -c 'write 0 16M' "$TEST_IMG" | _filter_qemu_io + +# Should not work (may work in the future by first decreasing all refcounts so +# they fit into the target range by copying them) +$QEMU_IMG amend -o refcount_bits=1 "$TEST_IMG" +_check_test_img +print_refcount_bits + +# Should work +$QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG" +_check_test_img +print_refcount_bits + +echo +echo '=== Testing too many references for check ===' +echo + +IMGOPTS="$IMGOPTS,refcount_bits=1" _make_test_img 64M +print_refcount_bits + +# This cluster should be created at 0x50000 +$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io +# Now make the second L2 entry (the L2 table should be at 0x40000) point to that +# cluster, so we have two references +poke_file "$TEST_IMG" $((0x40008)) "\x80\x00\x00\x00\x00\x05\x00\x00" + +# This should say "please use amend" +_check_test_img -r all + +# So we do that +$QEMU_IMG amend -o refcount_bits=2 "$TEST_IMG" +print_refcount_bits + +# And try again +_check_test_img -r all + +echo +echo '=== Multiple walks necessary during amend ===' +echo + +IMGOPTS="$IMGOPTS,refcount_bits=1,cluster_size=512" _make_test_img 64k + +# Cluster 0 is the image header, clusters 1 to 4 are used by the L1 table, a +# single L2 table, the reftable and a single refblock. This creates 58 data +# clusters (actually, the L2 table is created here, too), so in total there are +# then 63 used clusters in the image. With a refcount width of 64, one refblock +# describes 64 clusters (512 bytes / 64 bits/entry = 64 entries), so this will +# make the first refblock in the amended image have exactly one free entry. +$QEMU_IO -c "write 0 $((58 * 512))" "$TEST_IMG" | _filter_qemu_io + +# Now change the refcount width; since the first new refblock will have exactly +# one free entry, that entry will be used to store its own reference. No other +# refblocks are needed, so then the new reftable will be allocated; since the +# first new refblock is completely filled up, this will require a new refblock +# which is why the refcount width changing function will need to run through +# everything one more time until the allocations are stable. +# Having more walks than usual should be visible as regressing progress (from +# 66.67 % (2/3 walks) to 50.00 % (2/4 walks)). +$QEMU_IMG amend -o refcount_bits=64 -p "$TEST_IMG" | tr '\r' '\n' \ + | grep -A 1 '66.67' +print_refcount_bits + +_check_test_img + # success, all done echo '*** done' |