| commit | 0b919fae31f4f80f78ebeab8388dc3a03cc5e4ed | |
| author | Kevin Wolf <kwolf@redhat.com> | |
| Wed, 19 Jun 2013 11:44:20 +0000 (19 13:44 +0200) | ||
| committer | Stefan Hajnoczi <stefanha@redhat.com> | |
| Mon, 24 Jun 2013 08:25:17 +0000 (24 10:25 +0200) | ||
| tree | d28c579aa6c160de1efe1d46cf91c1c80f794e3f | treesnapshot (tar.gz zip) |
| parent | 67af674e478054086f972811dd0a11289afa39a9 | commitdiff |
qcow2: Batch discards
This optimises the discard operation for freed clusters by batching
discard requests (both snapshot deletion and bdrv_discard end up
updating the refcounts cluster by cluster).
Note that we don't discard asynchronously, but keep s->lock held. This
is to avoid that a freed cluster is reallocated and written to while the
discard is still in flight.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This optimises the discard operation for freed clusters by batching
discard requests (both snapshot deletion and bdrv_discard end up
updating the refcounts cluster by cluster).
Note that we don't discard asynchronously, but keep s->lock held. This
is to avoid that a freed cluster is reallocated and written to while the
discard is still in flight.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
| block/qcow2-cluster.c | diffblobblamehistory | |
| block/qcow2-refcount.c | diffblobblamehistory | |
| block/qcow2.c | diffblobblamehistory | |
| block/qcow2.h | diffblobblamehistory |