From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58814) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X3U4B-0005fN-3a for qemu-devel@nongnu.org; Sat, 05 Jul 2014 13:48:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X3U44-0000hF-Uz for qemu-devel@nongnu.org; Sat, 05 Jul 2014 13:48:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48884) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X3U44-0000h6-Mn for qemu-devel@nongnu.org; Sat, 05 Jul 2014 13:47:56 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s65HluIb018943 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Sat, 5 Jul 2014 13:47:56 -0400 From: Max Reitz Date: Sat, 5 Jul 2014 19:47:21 +0200 Message-Id: <1404582448-23840-8-git-send-email-mreitz@redhat.com> In-Reply-To: <1404582448-23840-1-git-send-email-mreitz@redhat.com> References: <1404582448-23840-1-git-send-email-mreitz@redhat.com> Subject: [Qemu-devel] [PATCH v9 07/14] qemu-img: Implement commit like QMP List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Stefan Hajnoczi , Max Reitz qemu-img should use QMP commands whenever possible in order to ensure feature completeness of both online and offline image operations. As qemu-img itself has no access to QMP (since this would basically require just everything being linked into qemu-img), imitate QMP's implementation of block-commit by using commit_active_start() and then waiting for the block job to finish. Signed-off-by: Max Reitz Reviewed-by: Eric Blake --- block/Makefile.objs | 2 +- qemu-img.c | 83 +++++++++++++++++++++++++++++++++++++++++------------ 2 files changed, 65 insertions(+), 20 deletions(-) diff --git a/block/Makefile.objs b/block/Makefile.objs index fd88c03..2c37e80 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -9,6 +9,7 @@ block-obj-y += snapshot.o qapi.o block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o block-obj-$(CONFIG_POSIX) += raw-posix.o block-obj-$(CONFIG_LINUX_AIO) += linux-aio.o +block-obj-y += mirror.o ifeq ($(CONFIG_POSIX),y) block-obj-y += nbd.o nbd-client.o sheepdog.o @@ -22,7 +23,6 @@ endif common-obj-y += stream.o common-obj-y += commit.o -common-obj-y += mirror.o common-obj-y += backup.o iscsi.o-cflags := $(LIBISCSI_CFLAGS) diff --git a/qemu-img.c b/qemu-img.c index c98896b..26d8b11 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -30,6 +30,7 @@ #include "qemu/osdep.h" #include "sysemu/sysemu.h" #include "block/block_int.h" +#include "block/blockjob.h" #include "block/qapi.h" #include #include @@ -717,12 +718,46 @@ fail: return ret; } +typedef struct CommonBlockJobCBInfo { + BlockDriverState *bs; + Error **errp; +} CommonBlockJobCBInfo; + +static void common_block_job_cb(void *opaque, int ret) +{ + CommonBlockJobCBInfo *cbi = opaque; + + if (ret < 0) { + error_setg_errno(cbi->errp, -ret, "Block job failed"); + } + + /* Drop this block job's reference */ + bdrv_unref(cbi->bs); +} + +static void run_block_job(BlockJob *job, Error **errp) +{ + AioContext *aio_context = bdrv_get_aio_context(job->bs); + + do { + aio_poll(aio_context, true); + + if (!job->busy && !job->ready) { + block_job_resume(job); + } + } while (!job->ready); + + block_job_complete_sync(job, errp); +} + static int img_commit(int argc, char **argv) { int c, ret, flags; const char *filename, *fmt, *cache; - BlockDriverState *bs; + BlockDriverState *bs, *base_bs; bool quiet = false; + Error *local_err = NULL; + CommonBlockJobCBInfo cbi; fmt = NULL; cache = BDRV_DEFAULT_CACHE; @@ -763,29 +798,39 @@ static int img_commit(int argc, char **argv) if (!bs) { return 1; } - ret = bdrv_commit(bs); - switch(ret) { - case 0: - qprintf(quiet, "Image committed.\n"); - break; - case -ENOENT: - error_report("No disk inserted"); - break; - case -EACCES: - error_report("Image is read-only"); - break; - case -ENOTSUP: - error_report("Image is already committed"); - break; - default: - error_report("Error while committing image"); - break; + + /* This is different from QMP, which by default uses the deepest file in the + * backing chain (i.e., the very base); however, the traditional behavior of + * qemu-img commit is using the immediate backing file. */ + base_bs = bs->backing_hd; + if (!base_bs) { + error_set(&local_err, QERR_BASE_NOT_FOUND, "NULL"); + goto done; + } + + cbi = (CommonBlockJobCBInfo){ + .errp = &local_err, + .bs = bs, + }; + + commit_active_start(bs, base_bs, 0, BLOCKDEV_ON_ERROR_REPORT, + common_block_job_cb, &cbi, &local_err); + if (local_err) { + goto done; } + run_block_job(bs->job, &local_err); + +done: bdrv_unref(bs); - if (ret) { + + if (local_err) { + qerror_report_err(local_err); + error_free(local_err); return 1; } + + qprintf(quiet, "Image committed.\n"); return 0; } -- 2.0.1