diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2013-03-26 17:50:11 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-03-28 11:52:44 +0100 |
| commit | 88c6588c5165da1526f735ed850861c5b74670bd (patch) | |
| tree | 9ad34c64a0ead016b0c384a319e9721837d7f81a /block/qcow2-cluster.c | |
| parent | 710c2496d8cecc92568d439a3cf9d5874b3a55e2 (diff) | |
| download | qemu-88c6588c5165da1526f735ed850861c5b74670bd.tar.gz qemu-88c6588c5165da1526f735ed850861c5b74670bd.tar.bz2 qemu-88c6588c5165da1526f735ed850861c5b74670bd.zip | |
qcow2: Allow requests with multiple l2metas
Instead of expecting a single l2meta, have a list of them. This allows
to still have a single I/O request for the guest data, even though
multiple l2meta may be needed in order to describe both a COW overwrite
and a new cluster allocation (typical sequential write case).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 78e7db9b28..6dc7f7f36b 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1069,10 +1069,13 @@ static int handle_alloc(BlockDriverState *bs, uint64_t guest_offset, int alloc_n_start = offset_into_cluster(s, guest_offset) >> BDRV_SECTOR_BITS; int nb_sectors = MIN(requested_sectors, avail_sectors); + QCowL2Meta *old_m = *m; *m = g_malloc0(sizeof(**m)); **m = (QCowL2Meta) { + .next = old_m, + .alloc_offset = alloc_cluster_offset, .offset = start_of_cluster(s, guest_offset), .nb_clusters = nb_clusters, |