From c4aaafbe296b0e38a54191d294436ffd718a2c7b Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Wed, 6 Nov 2013 16:53:27 +0100 Subject: [PATCH 70/87] block: add snapshot info query function bdrv_query_snapshot_info_list() RH-Author: Max Reitz Message-id: <1383756824-6921-5-git-send-email-mreitz@redhat.com> Patchwork-id: 55559 O-Subject: [RHEL-7.0 qemu-kvm PATCH v2 04/21] block: add snapshot info query function bdrv_query_snapshot_info_list() Bugzilla: 980771 RH-Acked-by: Kevin Wolf RH-Acked-by: Fam Zheng RH-Acked-by: Jeffrey Cody From: Wenchao Xia BZ: 980771 This patch adds function bdrv_query_snapshot_info_list(), which will retrieve snapshot info of an image in qmp object format. The implementation is based on the code moved from qemu-img.c with modification to fit more for qmp based block layer API. Signed-off-by: Wenchao Xia Reviewed-by: Eric Blake Signed-off-by: Stefan Hajnoczi (cherry picked from commit fb0ed4539c6f02fa9e5a3cf9df2549713451eeca) Signed-off-by: Max Reitz --- block/qapi.c | 55 +++++++++++++++++++++++++++++++++++++++------------- include/block/qapi.h | 4 +++- qemu-img.c | 5 ++++- 3 files changed, 49 insertions(+), 15 deletions(-) Signed-off-by: Miroslav Rezanina --- block/qapi.c | 55 ++++++++++++++++++++++++++++++++++++++----------- include/block/qapi.h | 4 ++- qemu-img.c | 5 +++- 3 files changed, 49 insertions(+), 15 deletions(-) diff --git a/block/qapi.c b/block/qapi.c index 794dbf8..1ed56da 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -26,29 +26,56 @@ #include "block/block_int.h" #include "qmp-commands.h" -void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info) +/* + * Returns 0 on success, with *p_list either set to describe snapshot + * information, or NULL because there are no snapshots. Returns -errno on + * error, with *p_list untouched. + */ +int bdrv_query_snapshot_info_list(BlockDriverState *bs, + SnapshotInfoList **p_list, + 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) { + 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 snapshots", + dev); + break; + default: + error_setg_errno(errp, -sn_count, + "Can't list snapshots of device '%s'", dev); + break; + } + return sn_count; + } for (i = 0; i < sn_count; i++) { - info->has_snapshots = true; - info_list = g_new0(SnapshotInfoList, 1); + 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->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_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; @@ -57,6 +84,8 @@ void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info) } g_free(sn_tab); + *p_list = head; + return 0; } void bdrv_collect_image_info(BlockDriverState *bs, diff --git a/include/block/qapi.h b/include/block/qapi.h index e6e568d..4f223d1 100644 --- a/include/block/qapi.h +++ b/include/block/qapi.h @@ -29,7 +29,9 @@ #include "block/block.h" #include "block/snapshot.h" -void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info); +int bdrv_query_snapshot_info_list(BlockDriverState *bs, + SnapshotInfoList **p_list, + Error **errp); void bdrv_collect_image_info(BlockDriverState *bs, ImageInfo *info, const char *filename); diff --git a/qemu-img.c b/qemu-img.c index 97b4212..e1fb148 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -1686,7 +1686,10 @@ static ImageInfoList *collect_image_info_list(const char *filename, info = g_new0(ImageInfo, 1); bdrv_collect_image_info(bs, info, filename); - bdrv_collect_snapshots(bs, info); + bdrv_query_snapshot_info_list(bs, &info->snapshots, NULL); + if (info->snapshots) { + info->has_snapshots = true; + } elem = g_new0(ImageInfoList, 1); elem->value = info; -- 1.7.1