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qcow2: Define and use QCOW2_COMPRESSED_SECTOR_SIZE

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When an L2 table entry points to a compressed cluster the space used
by the data is specified in 512-byte sectors. This size is independent
from BDRV_SECTOR_SIZE and is specific to the qcow2 file format.

The QCOW2_COMPRESSED_SECTOR_SIZE constant defined in this patch makes
this explicit.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2019-05-10 19:22:54 +03:00 • committed by Kevin Wolf
parent 50ba5b2d99
commit b6c246942b
4 changed files with 23 additions and 14 deletions
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5
block/qcow2-cluster.c
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@ -796,8 +796,9 @@ int qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
return cluster_offset;
}
nb_csectors = ((cluster_offset + compressed_size - 1) >> 9) -
(cluster_offset >> 9);
nb_csectors =
(cluster_offset + compressed_size - 1) / QCOW2_COMPRESSED_SECTOR_SIZE -
(cluster_offset / QCOW2_COMPRESSED_SECTOR_SIZE);
cluster_offset |= QCOW_OFLAG_COMPRESSED |
((uint64_t)nb_csectors << s->csize_shift);