[Qemu-devel] [PATCH 1/4] qcow2: Add qcow2_signal_corruption()

[Max Reitz <mreitz@redhat.com>]

Add a helper function for easily marking an image corrupt while
outputting an informative message to stderr and via QAPI.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2.c | 28 ++++++++++++++++++++++++++++
 block/qcow2.h |  4 ++++
 2 files changed, 32 insertions(+)

diff --git a/block/qcow2.c b/block/qcow2.c
index 435e0e1..ef2c931 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -30,6 +30,8 @@
 #include "qemu/error-report.h"
 #include "qapi/qmp/qerror.h"
 #include "qapi/qmp/qbool.h"
+#include "qapi/qmp/types.h"
+#include "qapi-event.h"
 #include "trace.h"
 #include "qemu/option_int.h"
 
@@ -2378,6 +2380,32 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts)
     return 0;
 }
 
+void qcow2_signal_corruption(BlockDriverState *bs, int64_t offset, int64_t size,
+                             const char *message_format, ...)
+{
+    char *message;
+    va_list ap;
+
+    va_start(ap, message_format);
+    message = g_strdup_vprintf(message_format, ap);
+    va_end(ap);
+
+    if (bs->read_only) {
+        fprintf(stderr, "qcow2: Image is corrupt: %s\n", message);
+    } else {
+        fprintf(stderr, "qcow2: Marking image as corrupt: %s\n", message);
+        qapi_event_send_block_image_corrupted(bdrv_get_device_name(bs), message,
+                                              offset >= 0, offset,
+                                              size >= 0, size, &error_abort);
+    }
+    g_free(message);
+
+    if (!bs->read_only) {
+        qcow2_mark_corrupt(bs);
+        bs->drv = NULL; /* make BDS unusable */
+    }
+}
+
 static QemuOptsList qcow2_create_opts = {
     .name = "qcow2-create-opts",
     .head = QTAILQ_HEAD_INITIALIZER(qcow2_create_opts.head),
diff --git a/block/qcow2.h b/block/qcow2.h
index b49424b..f66238e 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -468,6 +468,10 @@ int qcow2_mark_corrupt(BlockDriverState *bs);
 int qcow2_mark_consistent(BlockDriverState *bs);
 int qcow2_update_header(BlockDriverState *bs);
 
+void qcow2_signal_corruption(BlockDriverState *bs, int64_t offset, int64_t size,
+                             const char *message_format, ...)
+                             GCC_FMT_ATTR(4, 5);
+
 /* qcow2-refcount.c functions */
 int qcow2_refcount_init(BlockDriverState *bs);
 void qcow2_refcount_close(BlockDriverState *bs);
-- 
2.0.4