From patchwork Tue Feb 26 10:40:19 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wayne Xia X-Patchwork-Id: 223204 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 664DD2C02EA for ; Tue, 26 Feb 2013 22:25:59 +1100 (EST) Received: from localhost ([::1]:39511 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UAI1A-0006fl-Hf for incoming@patchwork.ozlabs.org; Tue, 26 Feb 2013 05:44:16 -0500 Received: from eggs.gnu.org ([208.118.235.92]:54696) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UAI04-0004Hd-5m for qemu-devel@nongnu.org; Tue, 26 Feb 2013 05:43:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UAI01-0003hY-4R for qemu-devel@nongnu.org; Tue, 26 Feb 2013 05:43:07 -0500 Received: from e23smtp03.au.ibm.com ([202.81.31.145]:49617) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UAI00-0003gO-6Q for qemu-devel@nongnu.org; Tue, 26 Feb 2013 05:43:05 -0500 Received: from /spool/local by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 26 Feb 2013 20:36:50 +1000 Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [9.190.235.21]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id A1AD52BB0051 for ; Tue, 26 Feb 2013 21:42:59 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r1QAgvLh655628 for ; Tue, 26 Feb 2013 21:42:57 +1100 Received: from d23av01.au.ibm.com (loopback [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r1QAgwL8016029 for ; Tue, 26 Feb 2013 21:42:59 +1100 Received: from RH63Wenchao (wenchaox.cn.ibm.com [9.115.122.152]) by d23av01.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r1QAeKOA012693; Tue, 26 Feb 2013 21:42:57 +1100 From: Wenchao Xia To: qemu-devel@nongnu.org Date: Tue, 26 Feb 2013 18:40:19 +0800 Message-Id: <1361875228-15769-6-git-send-email-xiawenc@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1361875228-15769-1-git-send-email-xiawenc@linux.vnet.ibm.com> References: <1361875228-15769-1-git-send-email-xiawenc@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13022610-6102-0000-0000-0000030FF49F X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 202.81.31.145 Cc: kwolf@redhat.com, aliguori@us.ibm.com, stefanha@gmail.com, armbru@redhat.com, lcapitulino@redhat.com, pbonzini@redhat.com, Wenchao Xia Subject: [Qemu-devel] [PATCH V7 05/14] block: add snapshot info query function bdrv_query_snapshot_infolist() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This patch add function bdrv_query_snapshot_infolist(), which will return snapshot info of an image in qmp object format. The implementation code are based on the code moved from qemu-img.c with modification to fit more for qmp based block layer API. To help filter out snapshot info not needed, a call back function is added in bdrv_query_snapshot_infolist(). bdrv_can_read_snapshot() should be called before call this function, to avoid got *errp set unexpectedly. Signed-off-by: Wenchao Xia Reviewed-by: Eric Blake --- block.c | 60 ++++++++++++++++++++++++++++++++++++++---------- include/block/block.h | 8 +++++- qemu-img.c | 8 +++++- 3 files changed, 61 insertions(+), 15 deletions(-) diff --git a/block.c b/block.c index 368b37c..8d0145a 100644 --- a/block.c +++ b/block.c @@ -2813,29 +2813,62 @@ int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, return 0; } -void collect_snapshots(BlockDriverState *bs , ImageInfo *info) +SnapshotInfoList *bdrv_query_snapshot_infolist(BlockDriverState *bs, + SnapshotFilterFunc filter, + void *opaque, + Error **errp) { int i, sn_count; QEMUSnapshotInfo *sn_tab = NULL; - SnapshotInfoList *info_list, *cur_item = NULL; + SnapshotInfoList *info_list, *cur_item = NULL, *head = NULL; + SnapshotInfo *info; + sn_count = bdrv_snapshot_list(bs, &sn_tab); + if (sn_count < 0) { + /* Now bdrv_snapshot_list() use negative value to tip error, so a check + * of it was done here. In future errp can be set by that function + * itself, by changing the call back functions in c files in ./block. + */ + const char *dev = bdrv_get_device_name(bs); + switch (sn_count) { + case -ENOMEDIUM: + error_setg(errp, "Device '%s' is not inserted.", dev); + break; + case -ENOTSUP: + error_setg(errp, + "Device '%s' does not support internal snapshot.", + dev); + break; + default: + error_setg(errp, + "Device '%s' got '%d' for bdrv_snapshot_list(), " + "message '%s'.", + dev, sn_count, strerror(-sn_count)); + break; + } + return NULL; + } for (i = 0; i < sn_count; i++) { - info->has_snapshots = true; - info_list = g_new0(SnapshotInfoList, 1); + if (filter && filter(&sn_tab[i], opaque) != 0) { + continue; + } - info_list->value = g_new0(SnapshotInfo, 1); - info_list->value->id = g_strdup(sn_tab[i].id_str); - info_list->value->name = g_strdup(sn_tab[i].name); - info_list->value->vm_state_size = sn_tab[i].vm_state_size; - info_list->value->date_sec = sn_tab[i].date_sec; - info_list->value->date_nsec = sn_tab[i].date_nsec; - info_list->value->vm_clock_sec = sn_tab[i].vm_clock_nsec / 1000000000; - info_list->value->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000; + info = g_new0(SnapshotInfo, 1); + info->id = g_strdup(sn_tab[i].id_str); + info->name = g_strdup(sn_tab[i].name); + info->vm_state_size = sn_tab[i].vm_state_size; + info->date_sec = sn_tab[i].date_sec; + info->date_nsec = sn_tab[i].date_nsec; + info->vm_clock_sec = sn_tab[i].vm_clock_nsec / 1000000000; + info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000; + + info_list = g_new0(SnapshotInfoList, 1); + info_list->value = info; /* XXX: waiting for the qapi to support qemu-queue.h types */ if (!cur_item) { - info->snapshots = cur_item = info_list; + head = cur_item = info_list; } else { cur_item->next = info_list; cur_item = info_list; @@ -2844,6 +2877,7 @@ void collect_snapshots(BlockDriverState *bs , ImageInfo *info) } g_free(sn_tab); + return head; } void collect_image_info(BlockDriverState *bs, diff --git a/include/block/block.h b/include/block/block.h index e6d915c..51a14f2 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -319,6 +319,13 @@ void bdrv_get_backing_filename(BlockDriverState *bs, char *filename, int filename_size); void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz); + +typedef int (*SnapshotFilterFunc)(const QEMUSnapshotInfo *sn, void *opaque); +/* assume bs is already opened, use qapi_free_* to free returned value. */ +SnapshotInfoList *bdrv_query_snapshot_infolist(BlockDriverState *bs, + SnapshotFilterFunc filter, + void *opaque, + Error **errp); BlockInfo *bdrv_query_info(BlockDriverState *s); BlockStats *bdrv_query_stats(const BlockDriverState *bs); bool bdrv_can_read_snapshot(BlockDriverState *bs); @@ -450,7 +457,6 @@ int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, int bdrv_debug_resume(BlockDriverState *bs, const char *tag); bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); -void collect_snapshots(BlockDriverState *bs , ImageInfo *info); void collect_image_info(BlockDriverState *bs, ImageInfo *info, const char *filename); diff --git a/qemu-img.c b/qemu-img.c index b650d17..1034cc5 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -1280,7 +1280,13 @@ static ImageInfoList *collect_image_info_list(const char *filename, info = g_new0(ImageInfo, 1); collect_image_info(bs, info, filename); - collect_snapshots(bs, info); + if (bdrv_can_read_snapshot(bs)) { + info->snapshots = bdrv_query_snapshot_infolist(bs, NULL, + NULL, NULL); + if (info->snapshots) { + info->has_snapshots = true; + } + } elem = g_new0(ImageInfoList, 1); elem->value = info;