[Qemu-devel] [PATCH for-next 4/6] blkdebug: Add "none" event

[Max Reitz <mreitz@redhat.com>]

Together with @iotypes and @sector, this can be used to trap e.g. the
first read or write access to a certain sector without having to know
what happens internally in the block layer, i.e. which "real" events
happen right before such an access.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 qapi/block-core.json | 4 +++-
 block/blkdebug.c     | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index 469d889753..045206196b 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3004,6 +3004,8 @@
 #
 # @cor_write: a write due to copy-on-read (since 2.11)
 #
+# @none: triggers once at creation of the blkdebug node (since 4.0)
+#
 # Since: 2.9
 ##
 { 'enum': 'BlkdebugEvent', 'prefix': 'BLKDBG',
@@ -3022,7 +3024,7 @@
             'pwritev_rmw_tail', 'pwritev_rmw_after_tail', 'pwritev',
             'pwritev_zero', 'pwritev_done', 'empty_image_prepare',
             'l1_shrink_write_table', 'l1_shrink_free_l2_clusters',
-            'cor_write'] }
+            'cor_write', 'none' ] }
 
 ##
 # @BlkdebugIOType:
diff --git a/block/blkdebug.c b/block/blkdebug.c
index d15b6c5fef..51f07648ba 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -491,6 +491,8 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
         goto out;
     }
 
+    bdrv_debug_event(bs, BLKDBG_NONE);
+
     ret = 0;
 out:
     if (ret < 0) {
-- 
2.19.2