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authorAlberto Garcia <berto@igalia.com>2019-05-10 19:22:54 +0300
committerKevin Wolf <kwolf@redhat.com>2019-05-20 17:08:56 +0200
commitb6c246942b14d3e0dec46a6c5868ed84e7dbea19 (patch)
treece424eaf7dd574d6ae54e64dcc380dac9c2de656 /block/qcow2.c
parent50ba5b2d994853b38fed10e0841b119da0f8b8e5 (diff)
qcow2: Define and use QCOW2_COMPRESSED_SECTOR_SIZE
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>
Diffstat (limited to 'block/qcow2.c')
-rw-r--r--block/qcow2.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 8e024007db..d39882785d 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -4187,7 +4187,8 @@ qcow2_co_preadv_compressed(BlockDriverState *bs,
coffset = file_cluster_offset & s->cluster_offset_mask;
nb_csectors = ((file_cluster_offset >> s->csize_shift) & s->csize_mask) + 1;
- csize = nb_csectors * 512 - (coffset & 511);
+ csize = nb_csectors * QCOW2_COMPRESSED_SECTOR_SIZE -
+ (coffset & ~QCOW2_COMPRESSED_SECTOR_MASK);
buf = g_try_malloc(csize);
if (!buf) {