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Fix error message about compressed clusters with OFLAG_COPIED 

Compressed clusters are not supposed to have the COPIED bit set.
"qemu-img check" detects that and prints an error message reporting
the number of the affected host cluster. This doesn't make much sense
because compressed clusters are not aligned to host clusters, so it
would be better to report the offset instead. Plus, the calculation is
wrong and it uses the raw L2 entry as if it was simply an offset.

This patch fixes the error message and reports the offset of the
compressed cluster.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 0f687957feb72e80c740403191a47e607c2463fe.1523376013.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
master
Alberto Garcia 2018-04-10 18:05:03 +02:00 committed by Max Reitz
parent 6cba5377f5
commit 74c44a5934
1 changed files with 2 additions and 2 deletions
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4
block/qcow2-refcount.c
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@ -1577,9 +1577,9 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
case QCOW2_CLUSTER_COMPRESSED:
/* Compressed clusters don't have QCOW_OFLAG_COPIED */
if (l2_entry & QCOW_OFLAG_COPIED) {
fprintf(stderr, "ERROR: cluster %" PRId64 ": "
fprintf(stderr, "ERROR: coffset=0x%" PRIx64 ": "
"copied flag must never be set for compressed "
"clusters\n", l2_entry >> s->cluster_bits);
"clusters\n", l2_entry & s->cluster_offset_mask);
l2_entry &= ~QCOW_OFLAG_COPIED;
res->corruptions++;
}