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| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2021-09-14 15:24:47 +0300 |
|---|---|---|
| committer | Hanna Reitz <hreitz@redhat.com> | 2021-09-15 18:42:38 +0200 |
| commit | a6e098462ba6d8585a6f21729b406ab51a70eb03 (patch) | |
| tree | 6fc338ee266754df846b5653bbdc66d4190820b5 /block/qcow2-cluster.c | |
| parent | 9a3978a46bc12e0c49b7114983103b07d90cfa1c (diff) | |
| download | qemu-a6e098462ba6d8585a6f21729b406ab51a70eb03.zip qemu-a6e098462ba6d8585a6f21729b406ab51a70eb03.tar.gz qemu-a6e098462ba6d8585a6f21729b406ab51a70eb03.tar.bz2 | |
qcow2: introduce qcow2_parse_compressed_l2_entry() helper
Add helper to parse compressed l2_entry and use it everywhere instead
of open-coding.
Note, that in most places we move to precise coffset/csize instead of
sector-aligned. Still it should work good enough for updating
refcounts.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20210914122454.141075-4-vsementsov@virtuozzo.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 3d53657..4ebb49a 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -2480,3 +2480,18 @@ fail: g_free(l1_table); return ret; } + +void qcow2_parse_compressed_l2_entry(BlockDriverState *bs, uint64_t l2_entry, + uint64_t *coffset, int *csize) +{ + BDRVQcow2State *s = bs->opaque; + int nb_csectors; + + assert(qcow2_get_cluster_type(bs, l2_entry) == QCOW2_CLUSTER_COMPRESSED); + + *coffset = l2_entry & s->cluster_offset_mask; + + nb_csectors = ((l2_entry >> s->csize_shift) & s->csize_mask) + 1; + *csize = nb_csectors * QCOW2_COMPRESSED_SECTOR_SIZE - + (*coffset & (QCOW2_COMPRESSED_SECTOR_SIZE - 1)); +} |