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Blame SOURCES/kvm-block-add-image-info-query-function-bdrv_query_image.patch

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From e705ed7009ed1d53dd1d382cb8cf61a562dc8a44 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 16:53:28 +0100
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Subject: [PATCH 71/87] block: add image info query function bdrv_query_image_info()
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <1383756824-6921-6-git-send-email-mreitz@redhat.com>
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Patchwork-id: 55560
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O-Subject: [RHEL-7.0 qemu-kvm PATCH v2 05/21] block: add image info query function bdrv_query_image_info()
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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_image_info(), which will
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retrieve image info in qmp object format. The implementation is
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based on the code moved from qemu-img.c, but uses block layer
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function to get snapshot info.
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Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 43526ec8d1395fe4efbed15e9764b64641b95bcc)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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---
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 block/qapi.c         | 43 +++++++++++++++++++++++++++++++++++++------
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 include/block/qapi.h |  6 +++---
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 qemu-img.c           | 11 ++++++-----
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 3 files changed, 46 insertions(+), 14 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block/qapi.c         |   43 +++++++++++++++++++++++++++++++++++++------
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 include/block/qapi.h |    6 +++---
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 qemu-img.c           |   11 ++++++-----
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 3 files changed, 46 insertions(+), 14 deletions(-)
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diff --git a/block/qapi.c b/block/qapi.c
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index 1ed56da..e9d8b74 100644
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--- a/block/qapi.c
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+++ b/block/qapi.c
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@@ -88,18 +88,29 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs,
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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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-                             ImageInfo *info,
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-                             const char *filename)
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+/**
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+ * bdrv_query_image_info:
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+ * @bs: block device to examine
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+ * @p_info: location to store image information
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+ * @errp: location to store error information
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+ *
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+ * @p_info will be set only on success. On error, store error in @errp.
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+ */
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+void bdrv_query_image_info(BlockDriverState *bs,
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+                           ImageInfo **p_info,
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+                           Error **errp)
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 {
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     uint64_t total_sectors;
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-    char backing_filename[1024];
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+    const char *backing_filename;
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     char backing_filename2[1024];
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     BlockDriverInfo bdi;
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+    int ret;
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+    Error *err = NULL;
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+    ImageInfo *info = g_new0(ImageInfo, 1);
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     bdrv_get_geometry(bs, &total_sectors);
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-    info->filename        = g_strdup(filename);
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+    info->filename        = g_strdup(bs->filename);
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     info->format          = g_strdup(bdrv_get_format_name(bs));
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     info->virtual_size    = total_sectors * 512;
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     info->actual_size     = bdrv_get_allocated_file_size(bs);
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@@ -116,7 +127,7 @@ void bdrv_collect_image_info(BlockDriverState *bs,
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         info->dirty_flag = bdi.is_dirty;
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         info->has_dirty_flag = true;
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     }
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-    bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
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+    backing_filename = bs->backing_file;
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     if (backing_filename[0] != '\0') {
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         info->backing_filename = g_strdup(backing_filename);
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         info->has_backing_filename = true;
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@@ -134,6 +145,26 @@ void bdrv_collect_image_info(BlockDriverState *bs,
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             info->has_backing_filename_format = true;
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         }
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     }
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+
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+    ret = bdrv_query_snapshot_info_list(bs, &info->snapshots, &err;;
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+    switch (ret) {
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+    case 0:
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+        if (info->snapshots) {
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+            info->has_snapshots = true;
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+        }
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+        break;
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+    /* recoverable error */
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+    case -ENOMEDIUM:
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+    case -ENOTSUP:
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+        error_free(err);
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+        break;
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+    default:
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+        error_propagate(errp, err);
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+        qapi_free_ImageInfo(info);
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+        return;
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+    }
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+
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+    *p_info = info;
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 }
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 BlockInfo *bdrv_query_info(BlockDriverState *bs)
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diff --git a/include/block/qapi.h b/include/block/qapi.h
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index 4f223d1..ab1f48f 100644
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--- a/include/block/qapi.h
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+++ b/include/block/qapi.h
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@@ -32,9 +32,9 @@
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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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+void bdrv_query_image_info(BlockDriverState *bs,
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+                           ImageInfo **p_info,
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+                           Error **errp);
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 BlockInfo *bdrv_query_info(BlockDriverState *s);
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 BlockStats *bdrv_query_stats(const BlockDriverState *bs);
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diff --git a/qemu-img.c b/qemu-img.c
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index e1fb148..fa0fd0e 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -1663,6 +1663,7 @@ static ImageInfoList *collect_image_info_list(const char *filename,
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     ImageInfoList *head = NULL;
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     ImageInfoList **last = &head;
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     GHashTable *filenames;
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+    Error *err = NULL;
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     filenames = g_hash_table_new_full(g_str_hash, str_equal_func, NULL, NULL);
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@@ -1684,11 +1685,11 @@ static ImageInfoList *collect_image_info_list(const char *filename,
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             goto err;
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         }
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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_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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+        bdrv_query_image_info(bs, &info, &err;;
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+        if (error_is_set(&err)) {
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+            error_report("%s", error_get_pretty(err));
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+            error_free(err);
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+            goto err;
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         }
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         elem = g_new0(ImageInfoList, 1);
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-- 
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1.7.1
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