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Blame SOURCES/kvm-block-add-snapshot-info-query-function-bdrv_query_sn.patch

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From c4aaafbe296b0e38a54191d294436ffd718a2c7b Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Wed, 6 Nov 2013 16:53:27 +0100
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Subject: [PATCH 70/87] block: add snapshot info query function bdrv_query_snapshot_info_list()
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <1383756824-6921-5-git-send-email-mreitz@redhat.com>
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Patchwork-id: 55559
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O-Subject: [RHEL-7.0 qemu-kvm PATCH v2 04/21] block: add snapshot info query function bdrv_query_snapshot_info_list()
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Bugzilla: 980771
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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From: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
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BZ: 980771
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This patch adds function bdrv_query_snapshot_info_list(), which will
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retrieve snapshot info of an image in qmp object format. The implementation
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is based on the code moved from qemu-img.c with modification to fit more
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for qmp based block layer API.
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Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit fb0ed4539c6f02fa9e5a3cf9df2549713451eeca)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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---
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 block/qapi.c         | 55 +++++++++++++++++++++++++++++++++++++++-------------
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 include/block/qapi.h |  4 +++-
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 qemu-img.c           |  5 ++++-
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 3 files changed, 49 insertions(+), 15 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block/qapi.c         |   55 ++++++++++++++++++++++++++++++++++++++-----------
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 include/block/qapi.h |    4 ++-
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 qemu-img.c           |    5 +++-
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 3 files changed, 49 insertions(+), 15 deletions(-)
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diff --git a/block/qapi.c b/block/qapi.c
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index 794dbf8..1ed56da 100644
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--- a/block/qapi.c
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+++ b/block/qapi.c
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@@ -26,29 +26,56 @@
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 #include "block/block_int.h"
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 #include "qmp-commands.h"
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-void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info)
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+/*
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+ * Returns 0 on success, with *p_list either set to describe snapshot
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+ * information, or NULL because there are no snapshots.  Returns -errno on
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+ * error, with *p_list untouched.
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+ */
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+int bdrv_query_snapshot_info_list(BlockDriverState *bs,
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+                                  SnapshotInfoList **p_list,
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+                                  Error **errp)
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 {
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     int i, sn_count;
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     QEMUSnapshotInfo *sn_tab = NULL;
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-    SnapshotInfoList *info_list, *cur_item = NULL;
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+    SnapshotInfoList *info_list, *cur_item = NULL, *head = NULL;
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+    SnapshotInfo *info;
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+
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     sn_count = bdrv_snapshot_list(bs, &sn_tab);
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+    if (sn_count < 0) {
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+        const char *dev = bdrv_get_device_name(bs);
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+        switch (sn_count) {
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+        case -ENOMEDIUM:
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+            error_setg(errp, "Device '%s' is not inserted", dev);
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+            break;
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+        case -ENOTSUP:
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+            error_setg(errp,
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+                       "Device '%s' does not support internal snapshots",
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+                       dev);
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+            break;
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+        default:
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+            error_setg_errno(errp, -sn_count,
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+                             "Can't list snapshots of device '%s'", dev);
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+            break;
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+        }
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+        return sn_count;
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+    }
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     for (i = 0; i < sn_count; i++) {
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-        info->has_snapshots = true;
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-        info_list = g_new0(SnapshotInfoList, 1);
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+        info = g_new0(SnapshotInfo, 1);
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+        info->id            = g_strdup(sn_tab[i].id_str);
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+        info->name          = g_strdup(sn_tab[i].name);
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+        info->vm_state_size = sn_tab[i].vm_state_size;
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+        info->date_sec      = sn_tab[i].date_sec;
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+        info->date_nsec     = sn_tab[i].date_nsec;
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+        info->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
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+        info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
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-        info_list->value                = g_new0(SnapshotInfo, 1);
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-        info_list->value->id            = g_strdup(sn_tab[i].id_str);
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-        info_list->value->name          = g_strdup(sn_tab[i].name);
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-        info_list->value->vm_state_size = sn_tab[i].vm_state_size;
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-        info_list->value->date_sec      = sn_tab[i].date_sec;
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-        info_list->value->date_nsec     = sn_tab[i].date_nsec;
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-        info_list->value->vm_clock_sec  = sn_tab[i].vm_clock_nsec / 1000000000;
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-        info_list->value->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
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+        info_list = g_new0(SnapshotInfoList, 1);
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+        info_list->value = info;
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         /* XXX: waiting for the qapi to support qemu-queue.h types */
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         if (!cur_item) {
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-            info->snapshots = cur_item = info_list;
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+            head = cur_item = info_list;
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         } else {
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             cur_item->next = info_list;
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             cur_item = info_list;
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@@ -57,6 +84,8 @@ void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info)
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     }
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     g_free(sn_tab);
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+    *p_list = head;
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+    return 0;
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 }
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 void bdrv_collect_image_info(BlockDriverState *bs,
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diff --git a/include/block/qapi.h b/include/block/qapi.h
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index e6e568d..4f223d1 100644
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--- a/include/block/qapi.h
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+++ b/include/block/qapi.h
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@@ -29,7 +29,9 @@
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 #include "block/block.h"
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 #include "block/snapshot.h"
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-void bdrv_collect_snapshots(BlockDriverState *bs , ImageInfo *info);
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+int bdrv_query_snapshot_info_list(BlockDriverState *bs,
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+                                  SnapshotInfoList **p_list,
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+                                  Error **errp);
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 void bdrv_collect_image_info(BlockDriverState *bs,
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                              ImageInfo *info,
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                              const char *filename);
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diff --git a/qemu-img.c b/qemu-img.c
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index 97b4212..e1fb148 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -1686,7 +1686,10 @@ static ImageInfoList *collect_image_info_list(const char *filename,
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         info = g_new0(ImageInfo, 1);
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         bdrv_collect_image_info(bs, info, filename);
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-        bdrv_collect_snapshots(bs, info);
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+        bdrv_query_snapshot_info_list(bs, &info->snapshots, NULL);
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+        if (info->snapshots) {
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+            info->has_snapshots = true;
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+        }
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         elem = g_new0(ImageInfoList, 1);
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         elem->value = info;
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-- 
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1.7.1
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