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| author | John Snow | 2019-03-12 17:05:49 +0100 |
|---|---|---|
| committer | John Snow | 2019-03-12 17:05:49 +0100 |
| commit | 74da6b943565c451d275de1b0253546c5e729d20 (patch) | |
| tree | c7fefafb2a403c558cc01c8367028510c6d0b89f /python | |
| parent | block/dirty-bitmaps: disallow busy bitmaps as merge source (diff) | |
| download | qemu-74da6b943565c451d275de1b0253546c5e729d20.tar.gz qemu-74da6b943565c451d275de1b0253546c5e729d20.tar.xz qemu-74da6b943565c451d275de1b0253546c5e729d20.zip | |
block/dirty-bitmaps: implement inconsistent bit
Set the inconsistent bit on load instead of rejecting such bitmaps.
There is no way to un-set it; the only option is to delete the bitmap.
Obvervations:
- bitmap loading does not need to update the header for in_use bitmaps.
- inconsistent bitmaps don't need to have their data loaded; they're
glorified corruption sentinels.
- bitmap saving does not need to save inconsistent bitmaps back to disk.
- bitmap reopening DOES need to drop the readonly flag from inconsistent
bitmaps to allow reopening of qcow2 files with non-qemu-owned bitmaps
being eventually flushed back to disk.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20190301191545.8728-8-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Diffstat (limited to 'python')
0 files changed, 0 insertions, 0 deletions