[Qemu-devel] [PATCH v2 1/3] block: Extrace bdrv_parse_detect_zeroes_flags

[Fam Zheng <famz@redhat.com>]

The logic will be shared with qmp_drive_mirror.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block.c               | 26 ++++++++++++++++++++++++++
 blockdev.c            | 14 ++------------
 include/block/block.h |  3 +++
 3 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/block.c b/block.c
index 9890707..d9686c5 100644
--- a/block.c
+++ b/block.c
@@ -33,6 +33,7 @@
 #include "qemu/notify.h"
 #include "block/coroutine.h"
 #include "block/qapi.h"
+#include "qapi/util.h"
 #include "qmp-commands.h"
 #include "qemu/timer.h"
 #include "qapi-event.h"
@@ -671,6 +672,31 @@ int bdrv_parse_cache_flags(const char *mode, int *flags)
     return 0;
 }
 
+BlockdevDetectZeroesOptions bdrv_parse_detect_zeroes_flags(const char *mode,
+                                                           int bdrv_flags,
+                                                           Error **errp)
+{
+    Error *local_err = NULL;
+    BlockdevDetectZeroesOptions detect_zeroes;
+    detect_zeroes =
+        qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
+                        mode,
+                        BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
+                        BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
+                        &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return detect_zeroes;
+    }
+
+    if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
+        !(bdrv_flags & BDRV_O_UNMAP)) {
+        error_setg(errp, "setting detect-zeroes to unmap is not allowed "
+                         "without setting discard operation to unmap");
+    }
+    return detect_zeroes;
+}
+
 /*
  * Returns the flags that a temporary snapshot should get, based on the
  * originally requested flags (the originally requested image will have flags
diff --git a/blockdev.c b/blockdev.c
index 6a45555..5ad6960 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -483,23 +483,13 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
     }
 
     detect_zeroes =
-        qapi_enum_parse(BlockdevDetectZeroesOptions_lookup,
-                        qemu_opt_get(opts, "detect-zeroes"),
-                        BLOCKDEV_DETECT_ZEROES_OPTIONS_MAX,
-                        BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
-                        &error);
+        bdrv_parse_detect_zeroes_flags(qemu_opt_get(opts, "detect-zeroes"),
+                                       bdrv_flags, &error);
     if (error) {
         error_propagate(errp, error);
         goto early_err;
     }
 
-    if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
-        !(bdrv_flags & BDRV_O_UNMAP)) {
-        error_setg(errp, "setting detect-zeroes to unmap is not allowed "
-                         "without setting discard operation to unmap");
-        goto early_err;
-    }
-
     /* init */
     if ((!file || !*file) && !has_driver_specific_opts) {
         blk = blk_new_with_bs(qemu_opts_id(opts), errp);
diff --git a/include/block/block.h b/include/block/block.h
index 4d9b555..b7905ab 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -194,6 +194,9 @@ void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
 int bdrv_parse_cache_flags(const char *mode, int *flags);
 int bdrv_parse_discard_flags(const char *mode, int *flags);
+BlockdevDetectZeroesOptions bdrv_parse_detect_zeroes_flags(const char *mode,
+                                                           int bdrv_flags,
+                                                           Error **errp);
 int bdrv_open_image(BlockDriverState **pbs, const char *filename,
                     QDict *options, const char *bdref_key, int flags,
                     bool allow_none, Error **errp);
-- 
2.4.2