diff options
| author | Federico Simoncelli <fsimonce@redhat.com> | 2013-01-28 06:59:46 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-02-22 21:21:08 +0100 |
| commit | c6bb9ad198c2caa9c7c8ba360a07630b5c10e4a8 (patch) | |
| tree | fb7d050ec41a145e93d9a677c4136e880879fc59 /block | |
| parent | 5cbb08283789caf7dbfd0890dcff47124ad766c2 (diff) | |
qemu-img: find the image end offset during check
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2-refcount.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index bc1784c30e..d36cb4dd2f 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -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: |