diff options
author | Alberto Garcia <berto@igalia.com> | 2019-05-10 19:22:54 +0300 |
---|---|---|
committer | Kevin Wolf <kwolf@redhat.com> | 2019-05-20 17:08:56 +0200 |
commit | b6c246942b14d3e0dec46a6c5868ed84e7dbea19 (patch) | |
tree | ce424eaf7dd574d6ae54e64dcc380dac9c2de656 /block/qcow2.c | |
parent | 50ba5b2d994853b38fed10e0841b119da0f8b8e5 (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.c | 3 |
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) { |