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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2015-07-02 17:24:41 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2015-07-07 10:31:08 +0100 |
| commit | 7a63f3cdc44230109c91cdc0ee912c3cc7837141 (patch) | |
| tree | a3e657a8da31f34aae5afe6e8b92cc186361784f /block/null.c | |
| parent | 1bd84ee717bf146c19281cce48a36a2f4d71748d (diff) | |
| download | qemu-7a63f3cdc44230109c91cdc0ee912c3cc7837141.tar.gz qemu-7a63f3cdc44230109c91cdc0ee912c3cc7837141.tar.bz2 qemu-7a63f3cdc44230109c91cdc0ee912c3cc7837141.zip | |
block: update bdrv_drain_all()/bdrv_drain() comments
The doc comments for bdrv_drain_all() and bdrv_drain() are outdated:
* The bdrv_drain() comment is a poor man's bdrv_lock()/bdrv_unlock()
which Fam Zheng is currently developing. Unfortunately this warning
was never really enough because devices keep submitting I/O and op
blockers don't prevent that.
* The bdrv_drain_all() comment is still partially correct but reflects
the nature of the implementation rather than API documentation.
Do make it clear that bdrv_drain() is only appropriate within an
AioContext. For anything spanning AioContexts you need
bdrv_drain_all().
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 1435854281-6078-1-git-send-email-stefanha@redhat.com
Diffstat (limited to 'block/null.c')
0 files changed, 0 insertions, 0 deletions