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authorAlberto Garcia <berto@igalia.com>2018-11-12 16:00:40 +0200
committerKevin Wolf <kwolf@redhat.com>2018-12-14 11:55:02 +0100
commit1ba793889583cf9b548bf61bd5c8f224ad6c1415 (patch)
treee17c25fdde7043bbf11c7a738f6c08d84e1f7f0f /block/mirror.c
parent1b57774f79e6fb5e848149e0bf227e0534e9ade5 (diff)
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block: Use bdrv_reopen_set_read_only() in the mirror driver
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 <berto@igalia.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/mirror.c')
-rw-r--r--block/mirror.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/block/mirror.c b/block/mirror.c
index 8f52c62..628f9e6 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -669,9 +669,10 @@ static int mirror_exit_common(Job *job)
if (s->should_complete && !abort) {
BlockDriverState *to_replace = s->to_replace ?: src;
+ bool ro = bdrv_is_read_only(to_replace);
- if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) {
- bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL);
+ 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
@@ -1689,13 +1690,15 @@ 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,
@@ -1714,6 +1717,8 @@ 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;
}