diff options
| author | Alberto Garcia <berto@igalia.com> | 2018-02-05 16:33:12 +0200 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2018-02-13 16:59:59 +0100 |
| commit | 05b5b6ee54cf69e7053c73286aac354be754235e (patch) | |
| tree | 56a7035b7e82c938b36d1c6aaf6b4c89be68ec5e /block/qcow2-cluster.c | |
| parent | 6e6fa7605e8a7c08d873dba9e1688f93aac20fc5 (diff) | |
qcow2: Add offset_to_l1_index()
Similar to offset_to_l2_index(), this function returns the index in
the L1 table for a given guest offset. This is only used in a couple
of places and it's not a particularly complex calculation, but it
makes the code a bit more readable.
Although in the qcow2_get_cluster_offset() case the old code was
taking advantage of the l1_bits variable, we're going to get rid of
the other uses of l1_bits in a later patch anyway, so it doesn't make
sense to keep it just for this.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: a5f626fed526b7459a0425fad06d823d18df8522.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index ab5715c97e..ce7591dc3d 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -540,7 +540,7 @@ int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset, /* seek to the l2 offset in the l1 table */ - l1_index = offset >> l1_bits; + l1_index = offset_to_l1_index(s, offset); if (l1_index >= s->l1_size) { type = QCOW2_CLUSTER_UNALLOCATED; goto out; @@ -663,7 +663,7 @@ static int get_cluster_table(BlockDriverState *bs, uint64_t offset, /* seek to the l2 offset in the l1 table */ - l1_index = offset >> (s->l2_bits + s->cluster_bits); + l1_index = offset_to_l1_index(s, offset); if (l1_index >= s->l1_size) { ret = qcow2_grow_l1_table(bs, l1_index + 1, false); if (ret < 0) { |