aboutsummaryrefslogtreecommitdiff
path: root/cpus.c
diff options
context:
space:
mode:
authorKevin Wolf <kwolf@redhat.com>2013-03-26 17:49:56 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-28 11:52:42 +0100
commit17a71e58238138c3f02be7e9f5dc8de5d72a9a9d (patch)
treee6ceb05281a72aacaf0bb543a13a39e766e4836b /cpus.c
parent9ee6439e27d15c528fde6d9da1e4c238a23b6b7a (diff)
qcow2: Handle dependencies earlier
Handling overlapping allocations isn't just a detail of cluster allocation. It is rather one of three ways to get the host cluster offset for a write request: 1. If a request overlaps an in-flight allocations, the cluster offset can be taken from there (this is what handle_dependencies will evolve into) or the request must just wait until the allocation has completed. Accessing the L2 is not valid in this case, it has outdated information. 2. Outside overlapping areas, check the clusters that can be written to as they are, with no COW involved. 3. If a COW is required, allocate new clusters Changing the code to reflect this doesn't change the behaviour because overlaps cannot exist for clusters that are kept in step 2. It does however make it easier for later patches to work on clusters that belong to an allocation that is still in flight. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'cpus.c')
0 files changed, 0 insertions, 0 deletions