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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/raw-format.c | |
| parent | 8c6242b6f383e43fd11d2c50f8bcdd2bba1100fc (diff) | |
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/raw-format.c')
0 files changed, 0 insertions, 0 deletions