From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55201) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wn9O0-0001YL-74 for qemu-devel@nongnu.org; Wed, 21 May 2014 12:29:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Wn9Ns-0002LI-9J for qemu-devel@nongnu.org; Wed, 21 May 2014 12:29:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44492) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wn9Ns-0002L6-1z for qemu-devel@nongnu.org; Wed, 21 May 2014 12:28:52 -0400 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s4LGSpLq012660 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 21 May 2014 12:28:51 -0400 From: Kevin Wolf Date: Wed, 21 May 2014 18:28:18 +0200 Message-Id: <1400689698-3096-21-git-send-email-kwolf@redhat.com> In-Reply-To: <1400689698-3096-1-git-send-email-kwolf@redhat.com> References: <1400689698-3096-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH 20/20] mirror: Handle failure for potentially large allocations List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com Some code in the block layer makes potentially huge allocations. Failure is not completely unexpected there, so avoid aborting qemu and handle out-of-memory situations gracefully. This patch addresses the allocations in the mirror block job. Signed-off-by: Kevin Wolf --- block/mirror.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/mirror.c b/block/mirror.c index 1c38aa8..5c059c9 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -350,7 +350,12 @@ static void coroutine_fn mirror_run(void *opaque) } end = s->common.len >> BDRV_SECTOR_BITS; - s->buf = qemu_blockalign(bs, s->buf_size); + s->buf = qemu_try_blockalign(bs, s->buf_size); + if (s->buf == NULL) { + ret = -ENOMEM; + goto immediate_exit; + } + sectors_per_chunk = s->granularity >> BDRV_SECTOR_BITS; mirror_free_init(s); -- 1.8.3.1