From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55977) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dyNpt-0007Ay-Bl for qemu-devel@nongnu.org; Sat, 30 Sep 2017 15:54:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dyNpo-00077J-WD for qemu-devel@nongnu.org; Sat, 30 Sep 2017 15:54:05 -0400 From: Eric Blake Date: Sat, 30 Sep 2017 14:53:43 -0500 Message-Id: <20170930195345.23338-3-eblake@redhat.com> In-Reply-To: <20170930195345.23338-1-eblake@redhat.com> References: <20170930195345.23338-1-eblake@redhat.com> Subject: [Qemu-devel] [PATCH 2/4] block: Add blkdebug hook for copy-on-read List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: jsnow@redhat.com, kwolf@redhat.com, qemu-block@nongnu.org, Stefan Hajnoczi , Fam Zheng , Max Reitz , Markus Armbruster List-ID: Make it possible to inject errors on writes performed during a read operation due to copy-on-read semantics. Signed-off-by: Eric Blake --- qapi/block-core.json | 5 ++++- block/io.c | 1 + 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/qapi/block-core.json b/qapi/block-core.json index 750bb0c77c..ab96e348e6 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -2538,6 +2538,8 @@ # # @l1_shrink_free_l2_clusters: discard the l2 tables. (since 2.11) # +# @cor_write: a write due to copy-on-read (since 2.11) +# # Since: 2.9 ## { 'enum': 'BlkdebugEvent', 'prefix': 'BLKDBG', @@ -2555,7 +2557,8 @@ 'flush_to_disk', 'pwritev_rmw_head', 'pwritev_rmw_after_head', 'pwritev_rmw_tail', 'pwritev_rmw_after_tail', 'pwritev', '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'] } ## # @BlkdebugInjectErrorOptions: diff --git a/block/io.c b/block/io.c index d633b0f851..97d9fa655d 100644 --- a/block/io.c +++ b/block/io.c @@ -983,6 +983,7 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child, goto err; } + bdrv_debug_event(bs, BLKDBG_COR_WRITE); if (drv->bdrv_co_pwrite_zeroes && buffer_is_zero(bounce_buffer, iov.iov_len)) { /* FIXME: Should we (perhaps conditionally) be setting -- 2.13.6