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blkdebug: Add "none" event

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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>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190507203508.18026-5-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-05-07 22:35:05 +02:00
parent 16789db3de
commit f8cec157cb
2 changed files with 5 additions and 1 deletions
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2
block/blkdebug.c
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@ -491,6 +491,8 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
goto out; goto out;
} }
bdrv_debug_event(bs, BLKDBG_NONE);
ret = 0; ret = 0;
out: out:
if (ret < 0) { if (ret < 0) {

4
qapi/block-core.json
View File

@ -3244,6 +3244,8 @@
# #
# @cluster_alloc_space: an allocation of file space for a cluster (since 4.1) # @cluster_alloc_space: an allocation of file space for a cluster (since 4.1)
# #
# @none: triggers once at creation of the blkdebug node (since 4.1)
#
# Since: 2.9 # Since: 2.9
## ##
{ 'enum': 'BlkdebugEvent', 'prefix': 'BLKDBG', { 'enum': 'BlkdebugEvent', 'prefix': 'BLKDBG',
@ -3262,7 +3264,7 @@
'pwritev_rmw_tail', 'pwritev_rmw_after_tail', 'pwritev', 'pwritev_rmw_tail', 'pwritev_rmw_after_tail', 'pwritev',
'pwritev_zero', 'pwritev_done', 'empty_image_prepare', 'pwritev_zero', 'pwritev_done', 'empty_image_prepare',
'l1_shrink_write_table', 'l1_shrink_free_l2_clusters', 'l1_shrink_write_table', 'l1_shrink_free_l2_clusters',
'cor_write', 'cluster_alloc_space'] } 'cor_write', 'cluster_alloc_space', 'none'] }
## ##
# @BlkdebugIOType: # @BlkdebugIOType: