[Qemu-devel] [RFC 2/7] block: bdrv_img_create(): add param_ret argument

[Luiz Capitulino <lcapitulino@redhat.com>]

If set returns a copy of the parameter list used by the block driver
to create the image.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 block.c    | 7 ++++++-
 block.h    | 3 ++-
 blockdev.c | 2 +-
 qemu-img.c | 2 +-
 4 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/block.c b/block.c
index e95f613..13cf04d 100644
--- a/block.c
+++ b/block.c
@@ -4294,7 +4294,8 @@ bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie)
 
 int bdrv_img_create(const char *filename, const char *fmt,
                     const char *base_filename, const char *base_fmt,
-                    char *options, uint64_t img_size, int flags)
+                    char *options, uint64_t img_size, int flags,
+                    QEMUOptionParameter **param_ret)
 {
     QEMUOptionParameter *param = NULL, *create_options = NULL;
     QEMUOptionParameter *backing_fmt, *backing_file, *size;
@@ -4430,6 +4431,10 @@ int bdrv_img_create(const char *filename, const char *fmt,
     }
 
 out:
+    if (param_ret) {
+        *param_ret = append_option_parameters(NULL, param);
+    }
+
     free_option_parameters(create_options);
     free_option_parameters(param);
 
diff --git a/block.h b/block.h
index e2d89d7..6403b12 100644
--- a/block.h
+++ b/block.h
@@ -341,7 +341,8 @@ int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
 
 int bdrv_img_create(const char *filename, const char *fmt,
                     const char *base_filename, const char *base_fmt,
-                    char *options, uint64_t img_size, int flags);
+                    char *options, uint64_t img_size, int flags,
+                    QEMUOptionParameter **param_ret);
 
 void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
 void *qemu_blockalign(BlockDriverState *bs, size_t size);
diff --git a/blockdev.c b/blockdev.c
index 99828ad..9dddefd 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -783,7 +783,7 @@ void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
             ret = bdrv_img_create(new_image_file, format,
                                   states->old_bs->filename,
                                   states->old_bs->drv->format_name,
-                                  NULL, -1, flags);
+                                  NULL, -1, flags, NULL);
             if (ret) {
                 error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
                 goto delete_and_fail;
diff --git a/qemu-img.c b/qemu-img.c
index f17f187..b841012 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -362,7 +362,7 @@ static int img_create(int argc, char **argv)
     }
 
     ret = bdrv_img_create(filename, fmt, base_filename, base_fmt,
-                          options, img_size, BDRV_O_FLAGS);
+                          options, img_size, BDRV_O_FLAGS, NULL);
 out:
     if (ret) {
         return 1;
-- 
1.7.12.315.g682ce8b