diff options
Diffstat (limited to 'block/mirror.c')
| -rw-r--r-- | block/mirror.c | 60 |
1 files changed, 47 insertions, 13 deletions
diff --git a/block/mirror.c b/block/mirror.c index 7c9f898089..6c3ee7041c 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -32,6 +32,12 @@ typedef struct MirrorBlockJob { RateLimit limit; BlockDriverState *target; BlockDriverState *base; + /* The name of the graph node to replace */ + char *replaces; + /* The BDS to replace */ + BlockDriverState *to_replace; + /* Used to block operations on the drive-mirror-replace target */ + Error *replace_blocker; bool is_none_mode; BlockdevOnError on_source_error, on_target_error; bool synced; @@ -500,10 +506,14 @@ immediate_exit: bdrv_release_dirty_bitmap(bs, s->dirty_bitmap); bdrv_iostatus_disable(s->target); if (s->should_complete && ret == 0) { - if (bdrv_get_flags(s->target) != bdrv_get_flags(s->common.bs)) { - bdrv_reopen(s->target, bdrv_get_flags(s->common.bs), NULL); + BlockDriverState *to_replace = s->common.bs; + if (s->to_replace) { + to_replace = s->to_replace; } - bdrv_swap(s->target, s->common.bs); + if (bdrv_get_flags(s->target) != bdrv_get_flags(to_replace)) { + bdrv_reopen(s->target, bdrv_get_flags(to_replace), NULL); + } + bdrv_swap(s->target, to_replace); if (s->common.driver->job_type == BLOCK_JOB_TYPE_COMMIT) { /* drop the bs loop chain formed by the swap: break the loop then * trigger the unref from the top one */ @@ -512,6 +522,12 @@ immediate_exit: bdrv_unref(p); } } + if (s->to_replace) { + bdrv_op_unblock_all(s->to_replace, s->replace_blocker); + error_free(s->replace_blocker); + bdrv_unref(s->to_replace); + } + g_free(s->replaces); bdrv_unref(s->target); block_job_completed(&s->common, ret); } @@ -550,6 +566,20 @@ static void mirror_complete(BlockJob *job, Error **errp) return; } + /* check the target bs is not blocked and block all operations on it */ + if (s->replaces) { + s->to_replace = check_to_replace_node(s->replaces, &local_err); + if (!s->to_replace) { + error_propagate(errp, local_err); + return; + } + + error_setg(&s->replace_blocker, + "block device is in use by block-job-complete"); + bdrv_op_block_all(s->to_replace, s->replace_blocker); + bdrv_ref(s->to_replace); + } + s->should_complete = true; block_job_resume(job); } @@ -572,14 +602,15 @@ static const BlockJobDriver commit_active_job_driver = { }; static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target, - int64_t speed, int64_t granularity, - int64_t buf_size, - BlockdevOnError on_source_error, - BlockdevOnError on_target_error, - BlockDriverCompletionFunc *cb, - void *opaque, Error **errp, - const BlockJobDriver *driver, - bool is_none_mode, BlockDriverState *base) + const char *replaces, + int64_t speed, int64_t granularity, + int64_t buf_size, + BlockdevOnError on_source_error, + BlockdevOnError on_target_error, + BlockDriverCompletionFunc *cb, + void *opaque, Error **errp, + const BlockJobDriver *driver, + bool is_none_mode, BlockDriverState *base) { MirrorBlockJob *s; @@ -610,6 +641,7 @@ static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target, return; } + s->replaces = g_strdup(replaces); s->on_source_error = on_source_error; s->on_target_error = on_target_error; s->target = target; @@ -631,6 +663,7 @@ static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target, } void mirror_start(BlockDriverState *bs, BlockDriverState *target, + const char *replaces, int64_t speed, int64_t granularity, int64_t buf_size, MirrorSyncMode mode, BlockdevOnError on_source_error, BlockdevOnError on_target_error, @@ -642,7 +675,8 @@ void mirror_start(BlockDriverState *bs, BlockDriverState *target, is_none_mode = mode == MIRROR_SYNC_MODE_NONE; base = mode == MIRROR_SYNC_MODE_TOP ? bs->backing_hd : NULL; - mirror_start_job(bs, target, speed, granularity, buf_size, + mirror_start_job(bs, target, replaces, + speed, granularity, buf_size, on_source_error, on_target_error, cb, opaque, errp, &mirror_job_driver, is_none_mode, base); } @@ -690,7 +724,7 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base, } bdrv_ref(base); - mirror_start_job(bs, base, speed, 0, 0, + mirror_start_job(bs, base, NULL, speed, 0, 0, on_error, on_error, cb, opaque, &local_err, &commit_active_job_driver, false, base); if (local_err) { |