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qcow2: Make preallocate_co() resize the image to the correct size

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This function preallocates metadata structures and then extends the
image to its new size, but that new size calculation is wrong because
it doesn't take into account that the host_offset variable is always
cluster-aligned.

This problem can be reproduced with preallocation=metadata when the
original size is not cluster-aligned but the new size is. In this case
the final image size will be shorter than expected.

   qemu-img create -f qcow2 img.qcow2 31k
   qemu-img resize --preallocation=metadata img.qcow2 128k

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-Id: <adeb8b059917b141d5f5b3bd2a016262d3052c79.1599833007.git.berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
[mreitz: Mark compat=0.10 unsupported for iotest 125]
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Alberto Garcia 2020-09-11 16:09:41 +02:00 • committed by Max Reitz
parent c1dadda02c
commit 8e958260c5
3 changed files with 53 additions and 20 deletions
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28
tests/qemu-iotests/125.out
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@ -768,11 +768,35 @@ wrote 81920/81920 bytes at offset 2048000
80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=raw size=131072
--- Resizing image from 31k to 96k ---
--- Resizing image from 31k to 96k (preallocation=metadata) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=31744 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.
--- Resizing image from 33k to 96k ---
--- Resizing image from 31k to 96k (preallocation=full) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=31744 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.
--- Resizing image from 31k to 128k (preallocation=metadata) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=31744 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.
--- Resizing image from 31k to 128k (preallocation=full) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=31744 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.
--- Resizing image from 33k to 96k (preallocation=metadata) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=33792 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.
--- Resizing image from 33k to 96k (preallocation=full) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=33792 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.
--- Resizing image from 33k to 128k (preallocation=metadata) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=33792 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.
--- Resizing image from 33k to 128k (preallocation=full) ---
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=33792 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=raw
Image resized.