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qemu-img: find the image end offset during check

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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 <fsimonce@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Federico Simoncelli 2013-01-28 06:59:46 -05:00 • committed by Kevin Wolf
parent 5cbb082837
commit c6bb9ad198
8 changed files with 24 additions and 10 deletions
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10
block/qcow2-refcount.c
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@ -1112,7 +1112,7 @@ 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;
@ -1183,7 +1183,7 @@ 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++) {
refcount1 = get_refcount(bs, i);
if (refcount1 < 0) {
fprintf(stderr, "Can't get refcount for cluster %" PRId64 ": %s\n",
@ -1193,6 +1193,11 @@ 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 */
@ -1227,6 +1232,7 @@ int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
}
}
res->image_end_offset = (highest_cluster + 1) * s->cluster_size;
ret = 0;
fail: