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qcow2: Return real error in qcow2_update_snapshot_refcount

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This fixes the error message triggered by the following script:

    cat > /tmp/blkdebug.cfg <<EOF
    [inject-error]
    event = "cluster_free"
    errno = "28"
    immediately = "off"
    EOF

    $qemu_img create -f qcow2 test.qcow2 10G
    $qemu_img snapshot -c snap test.qcow2
    $qemu_img snapshot -d snap blkdebug:/tmp/blkdebug.cfg:test.qcow2

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2013-04-05 12:51:31 +02:00
parent 0775437faf
commit c2bc78b6a9
1 changed files with 5 additions and 6 deletions
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11
block/qcow2-refcount.c
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@ -747,10 +747,9 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
if (l1_table_offset != s->l1_table_offset) {
l1_table = g_malloc0(align_offset(l1_size2, 512));
l1_allocated = 1;
if (bdrv_pread(bs->file, l1_table_offset,
l1_table, l1_size2) != l1_size2)
{
ret = -EIO;
ret = bdrv_pread(bs->file, l1_table_offset, l1_table, l1_size2);
if (ret < 0) {
goto fail;
}
@ -802,7 +801,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
}
if (refcount < 0) {
ret = -EIO;
ret = refcount;
goto fail;
}
}
@ -833,7 +832,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
refcount = get_refcount(bs, l2_offset >> s->cluster_bits);
}
if (refcount < 0) {
ret = -EIO;
ret = refcount;
goto fail;
} else if (refcount == 1) {
l2_offset |= QCOW_OFLAG_COPIED;