[Qemu-block] [PATCH v6 2/9] block: Change bdrv_get_encrypted_filename()

[Max Reitz]

Instead of returning a pointer to the filename, g_strdup() it. This will
become necessary once we do not have BlockDriverState.filename anymore.

Signed-off-by: Max Reitz <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Kevin Wolf <address@hidden>
---
 include/block/block.h |  2 +-
 block.c               | 17 ++++++++++-------
 monitor.c             |  5 ++++-
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/include/block/block.h b/include/block/block.h
index 7bcbd05338..3425e9fa79 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -432,7 +432,7 @@ void bdrv_round_to_clusters(BlockDriverState *bs,
                             int64_t *cluster_offset,
                             unsigned int *cluster_bytes);
 
-const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
+char *bdrv_get_encrypted_filename(BlockDriverState *bs);
 void bdrv_get_backing_filename(BlockDriverState *bs,
                                char *filename, int filename_size);
 char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp);
diff --git a/block.c b/block.c
index c63fc1b2da..95015251d5 100644
--- a/block.c
+++ b/block.c
@@ -2858,10 +2858,12 @@ void bdrv_add_key(BlockDriverState *bs, const char 
*key, Error **errp)
         }
     } else {
         if (bdrv_key_required(bs)) {
+            char *enc_filename = bdrv_get_encrypted_filename(bs);
             error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED,
                       "'%s' (%s) is encrypted",
                       bdrv_get_device_or_node_name(bs),
-                      bdrv_get_encrypted_filename(bs));
+                      enc_filename ?: "");
+            g_free(enc_filename);
         }
     }
 }
@@ -3111,14 +3113,15 @@ bool bdrv_can_write_zeroes_with_unmap(BlockDriverState 
*bs)
     return false;
 }
 
-const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
+char *bdrv_get_encrypted_filename(BlockDriverState *bs)
 {
-    if (bs->backing && bs->backing->bs->encrypted)
-        return bs->backing_file;
-    else if (bs->encrypted)
-        return bs->filename;
-    else
+    if (bs->backing && bs->backing->bs->encrypted) {
+        return g_strdup(bs->backing_file);
+    } else if (bs->encrypted) {
+        return g_strdup(bs->filename);
+    } else {
         return NULL;
+    }
 }
 
 void bdrv_get_backing_filename(BlockDriverState *bs,
diff --git a/monitor.c b/monitor.c
index 0841d436b0..bb3000a2df 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4056,10 +4056,13 @@ int monitor_read_bdrv_key_start(Monitor *mon, 
BlockDriverState *bs,
                                 BlockCompletionFunc *completion_cb,
                                 void *opaque)
 {
+    char *enc_filename;
     int err;
 
+    enc_filename = bdrv_get_encrypted_filename(bs);
     monitor_printf(mon, "%s (%s) is encrypted.\n", bdrv_get_device_name(bs),
-                   bdrv_get_encrypted_filename(bs));
+                   enc_filename ?: "");
+    g_free(enc_filename);
 
     mon->password_completion_cb = completion_cb;
     mon->password_opaque = opaque;
-- 
2.11.0