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[Qemu-block] [PATCH 09/14] block: Use bdrv_reopen_set_read_only() in the


From: Alberto Garcia
Subject: [Qemu-block] [PATCH 09/14] block: Use bdrv_reopen_set_read_only() in the mirror driver
Date: Wed, 19 Sep 2018 17:47:47 +0300

The 'block-commit' QMP command is implemented internally using two
different drivers. If the source image is the active layer then the
mirror driver is used (commit_active_start()), otherwise the commit
driver is used (commit_start()).

In both cases the destination image must be put temporarily in
read-write mode. This is done correctly in the latter case, but what
commit_active_start() does is copy all flags instead.

This patch replaces the bdrv_reopen() calls in that function with
bdrv_reopen_set_read_only() so that only the read-only status is
changed.

A similar change is made in mirror_exit(), which is also used by the
'drive-mirror' and 'blockdev-mirror' commands.

Signed-off-by: Alberto Garcia <address@hidden>
---
 block/mirror.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 6cc10df5c9..37f8d3ac56 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -663,13 +663,15 @@ static void mirror_exit(Job *job, void *opaque)
     }
 
     if (s->should_complete && data->ret == 0) {
+        bool ro;
         BlockDriverState *to_replace = src;
         if (s->to_replace) {
             to_replace = s->to_replace;
         }
 
-        if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) {
-            bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL);
+        ro = bdrv_is_read_only(to_replace);
+        if (ro != bdrv_is_read_only(target_bs)) {
+            bdrv_reopen_set_read_only(target_bs, ro, NULL);
         }
 
         /* The mirror job has no requests in flight any more, but we need to
@@ -1674,13 +1676,15 @@ void commit_active_start(const char *job_id, 
BlockDriverState *bs,
                          BlockCompletionFunc *cb, void *opaque,
                          bool auto_complete, Error **errp)
 {
-    int orig_base_flags;
+    bool base_read_only;
     Error *local_err = NULL;
 
-    orig_base_flags = bdrv_get_flags(base);
+    base_read_only = bdrv_is_read_only(base);
 
-    if (bdrv_reopen(base, bs->open_flags, errp)) {
-        return;
+    if (base_read_only) {
+        if (bdrv_reopen_set_read_only(base, false, errp) < 0) {
+            return;
+        }
     }
 
     mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0,
@@ -1699,6 +1703,8 @@ void commit_active_start(const char *job_id, 
BlockDriverState *bs,
 error_restore_flags:
     /* ignore error and errp for bdrv_reopen, because we want to propagate
      * the original error */
-    bdrv_reopen(base, orig_base_flags, NULL);
+    if (base_read_only) {
+        bdrv_reopen_set_read_only(base, true, NULL);
+    }
     return;
 }
-- 
2.11.0




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