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| author | Kevin Wolf <kwolf@redhat.com> | 2020-04-24 14:54:42 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-04-30 17:51:07 +0200 |
| commit | f01643fb8b47e8a70c04bbf45e0f12a9e5bc54de (patch) | |
| tree | 446a67520b49b8cde4e1fa8905af815cb107d462 /block/qcow2-cluster.c | |
| parent | 8c6242b6f383e43fd11d2c50f8bcdd2bba1100fc (diff) | |
| download | qemu-f01643fb8b47e8a70c04bbf45e0f12a9e5bc54de.zip qemu-f01643fb8b47e8a70c04bbf45e0f12a9e5bc54de.tar.gz qemu-f01643fb8b47e8a70c04bbf45e0f12a9e5bc54de.tar.bz2 | |
qcow2: Support BDRV_REQ_ZERO_WRITE for truncate
If BDRV_REQ_ZERO_WRITE is set and we're extending the image, calling
qcow2_cluster_zeroize() with flags=0 does the right thing: It doesn't
undo any previous preallocation, but just adds the zero flag to all
relevant L2 entries. If an external data file is in use, a write_zeroes
request to the data file is made instead.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200424125448.63318-5-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 17f1363..4b5fc8c 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1795,7 +1795,7 @@ int qcow2_cluster_zeroize(BlockDriverState *bs, uint64_t offset, /* Caller must pass aligned values, except at image end */ assert(QEMU_IS_ALIGNED(offset, s->cluster_size)); assert(QEMU_IS_ALIGNED(end_offset, s->cluster_size) || - end_offset == bs->total_sectors << BDRV_SECTOR_BITS); + end_offset >= bs->total_sectors << BDRV_SECTOR_BITS); /* The zero flag is only supported by version 3 and newer */ if (s->qcow_version < 3) { |