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block: Use bdrv_reopen_set_read_only() in the mirror driver

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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>
This commit is contained in:
Alberto Garcia 2018-11-12 16:00:40 +02:00 committed by Kevin Wolf
parent 1b57774f79
commit 1ba7938895
1 changed files with 12 additions and 7 deletions
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19
block/mirror.c
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@ -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;
}