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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2018-03-06 20:48:18 +0000 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2018-03-13 15:38:55 -0500 |
| commit | d03654eacdf35f436fbe78ca46cea215d5165ab5 (patch) | |
| tree | 0641a1398fb1b43f9a2e54fbbef07d6080d56568 /block/trace-events | |
| parent | 65529782f8fec531fd114cc0f58399e88202153c (diff) | |
| download | qemu-d03654eacdf35f436fbe78ca46cea215d5165ab5.tar.gz | |
block: let blk_add/remove_aio_context_notifier() tolerate BDS changes
Commit 2019ba0a0197 ("block: Add AioContextNotifier functions to BB")
added blk_add/remove_aio_context_notifier() and implemented them by
passing through the bdrv_*() equivalent.
This doesn't work across bdrv_append(), which detaches child->bs and
re-attaches it to a new BlockDriverState. When
blk_remove_aio_context_notifier() is called we will access the new BDS
instead of the one where the notifier was added!
>From the point of view of the blk_*() API user, changes to the root BDS
should be transparent.
This patch maintains a list of AioContext notifiers in BlockBackend and
adds/removes them from the BlockDriverState as needed.
Reported-by: Stefano Panella <spanella@gmail.com>
Cc: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20180306204819.11266-2-stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'block/trace-events')
| -rw-r--r-- | block/trace-events | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/trace-events b/block/trace-events index 02dd80ff0c..7493d521dc 100644 --- a/block/trace-events +++ b/block/trace-events @@ -7,6 +7,8 @@ bdrv_lock_medium(void *bs, bool locked) "bs %p locked %d" # block/block-backend.c blk_co_preadv(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x" blk_co_pwritev(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x" +blk_root_attach(void *child, void *blk, void *bs) "child %p blk %p bs %p" +blk_root_detach(void *child, void *blk, void *bs) "child %p blk %p bs %p" # block/io.c bdrv_co_preadv(void *bs, int64_t offset, int64_t nbytes, unsigned int flags) "bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x" |