From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41157) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c01IY-0000z3-J7 for qemu-devel@nongnu.org; Fri, 28 Oct 2016 03:09:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c01IX-00006u-3h for qemu-devel@nongnu.org; Fri, 28 Oct 2016 03:09:54 -0400 From: Alberto Garcia Date: Fri, 28 Oct 2016 10:08:10 +0300 Message-Id: <62134b19e701d58c55b10628cb0db69114e96c9f.1477638050.git.berto@igalia.com> In-Reply-To: References: In-Reply-To: References: Subject: [Qemu-devel] [PATCH v13 09/19] block: Support streaming to an intermediate layer List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, Kevin Wolf , Eric Blake , Markus Armbruster , Max Reitz , Alberto Garcia This makes sure that the image we are streaming into is open in read-write mode during the operation. Operation blockers are also set in all intermediate nodes, since they will be removed from the chain afterwards. Finally, this also unblocks the stream operation in backing files. Signed-off-by: Alberto Garcia Reviewed-by: Kevin Wolf --- block.c | 4 +++- block/stream.c | 24 ++++++++++++++++++++++++ 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/block.c b/block.c index adbecd0..1ef36c9 100644 --- a/block.c +++ b/block.c @@ -1428,9 +1428,11 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) backing_hd->drv ? backing_hd->drv->format_name : ""); bdrv_op_block_all(backing_hd, bs->backing_blocker); - /* Otherwise we won't be able to commit due to check in bdrv_commit */ + /* Otherwise we won't be able to commit or stream */ bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, bs->backing_blocker); + bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, + bs->backing_blocker); /* * We do backup in 3 ways: * 1. drive backup diff --git a/block/stream.c b/block/stream.c index 3187481..b8ab89a 100644 --- a/block/stream.c +++ b/block/stream.c @@ -37,6 +37,7 @@ typedef struct StreamBlockJob { BlockDriverState *base; BlockdevOnError on_error; char *backing_file_str; + int bs_flags; } StreamBlockJob; static int coroutine_fn stream_populate(BlockBackend *blk, @@ -81,6 +82,11 @@ static void stream_complete(BlockJob *job, void *opaque) bdrv_set_backing_hd(bs, base); } + /* Reopen the image back in read-only mode if necessary */ + if (s->bs_flags != bdrv_get_flags(bs)) { + bdrv_reopen(bs, s->bs_flags, NULL); + } + g_free(s->backing_file_str); block_job_completed(&s->common, data->ret); g_free(data); @@ -220,6 +226,8 @@ void stream_start(const char *job_id, BlockDriverState *bs, BlockCompletionFunc *cb, void *opaque, Error **errp) { StreamBlockJob *s; + BlockDriverState *iter; + int orig_bs_flags; s = block_job_create(job_id, &stream_job_driver, bs, speed, cb, opaque, errp); @@ -227,8 +235,24 @@ void stream_start(const char *job_id, BlockDriverState *bs, return; } + /* Make sure that the image is opened in read-write mode */ + orig_bs_flags = bdrv_get_flags(bs); + if (!(orig_bs_flags & BDRV_O_RDWR)) { + if (bdrv_reopen(bs, orig_bs_flags | BDRV_O_RDWR, errp) != 0) { + block_job_unref(&s->common); + return; + } + } + + /* Block all intermediate nodes between bs and base, because they + * will disappear from the chain after this operation */ + for (iter = backing_bs(bs); iter && iter != base; iter = backing_bs(iter)) { + block_job_add_bdrv(&s->common, iter); + } + s->base = base; s->backing_file_str = g_strdup(backing_file_str); + s->bs_flags = orig_bs_flags; s->on_error = on_error; s->common.co = qemu_coroutine_create(stream_run, s); -- 2.9.3