From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:60745) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UHuac-0001fT-LB for qemu-devel@nongnu.org; Tue, 19 Mar 2013 07:20:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UHuaX-0004RP-Fh for qemu-devel@nongnu.org; Tue, 19 Mar 2013 07:20:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20488) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UHuaX-0004RA-6j for qemu-devel@nongnu.org; Tue, 19 Mar 2013 07:20:17 -0400 From: Kevin Wolf Date: Tue, 19 Mar 2013 12:19:52 +0100 Message-Id: <1363691994-20571-4-git-send-email-kwolf@redhat.com> In-Reply-To: <1363691994-20571-1-git-send-email-kwolf@redhat.com> References: <1363691994-20571-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH 3/5] block: fix BDRV_O_SNAPSHOT protocol detection List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: anthony@codemonkey.ws Cc: kwolf@redhat.com, qemu-devel@nongnu.org From: Stefan Hajnoczi realpath(3) is used to get an absolute path to the image file when creating a -drive snapshot=on temporary qcow2. This does not work for protocols since their filenames ("proto:foo:...") do not correspond to file system paths. Commit 7c96d46ec245d73fd76726588409f9abe4bd5dc1 ("Let snapshot work with protocols") skipped realpath(3) for protocols. Later on the "raw" format was introduced and broke the check. Use path_has_protocol(filename) to decide if this image uses a protocol or a filename. Reported-by: Richard Jones Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/block.c b/block.c index 037e15e..0a062c9 100644 --- a/block.c +++ b/block.c @@ -830,7 +830,6 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, if (flags & BDRV_O_SNAPSHOT) { BlockDriverState *bs1; int64_t total_size; - int is_protocol = 0; BlockDriver *bdrv_qcow2; QEMUOptionParameter *options; char backing_filename[PATH_MAX]; @@ -847,9 +846,6 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, } total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; - if (bs1->drv && bs1->drv->protocol_name) - is_protocol = 1; - bdrv_delete(bs1); ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); @@ -858,7 +854,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, } /* Real path is meaningless for protocols */ - if (is_protocol) { + if (path_has_protocol(filename)) { snprintf(backing_filename, sizeof(backing_filename), "%s", filename); } else if (!realpath(filename, backing_filename)) { -- 1.8.1.4