No need to start a tracked request that will always fail. The choice
to check read-only after bdrv_inc_in_flight() predates 1bc5f09f2e
(block: Use tracked request for truncate), but waiting for serializing
requests can make the effect more noticeable.
Signed-off-by: Eric Blake <eblake@redhat.com>
---
block/io.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/block/io.c b/block/io.c
index 323854d06337..1a05f320d35e 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3390,6 +3390,11 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
return old_size;
}
+ if (bdrv_is_read_only(bs)) {
+ error_setg(errp, "Image is read-only");
+ return -EACCES;
+ }
+
if (offset > old_size) {
new_bytes = offset - old_size;
} else {
@@ -3406,11 +3411,6 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
if (new_bytes) {
bdrv_make_request_serialising(&req, 1);
}
- if (bdrv_is_read_only(bs)) {
- error_setg(errp, "Image is read-only");
- ret = -EACCES;
- goto out;
- }
ret = bdrv_co_write_req_prepare(child, offset - new_bytes, new_bytes, &req,
0);
if (ret < 0) {
--
2.31.1