int max_iov;
bool initial_zeroing_ongoing;
int in_active_write_counter;
+ bool prepared;
} MirrorBlockJob;
typedef struct MirrorBDSOpaque {
}
}
-typedef struct {
- int ret;
-} MirrorExitData;
-
-static void mirror_exit(Job *job, void *opaque)
+/**
+ * mirror_exit_common: handle both abort() and prepare() cases.
+ * for .prepare, returns 0 on success and -errno on failure.
+ * for .abort cases, denoted by abort = true, MUST return 0.
+ */
+static int mirror_exit_common(Job *job)
{
MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
BlockJob *bjob = &s->common;
- MirrorExitData *data = opaque;
MirrorBDSOpaque *bs_opaque = s->mirror_top_bs->opaque;
AioContext *replace_aio_context = NULL;
BlockDriverState *src = s->mirror_top_bs->backing->bs;
BlockDriverState *target_bs = blk_bs(s->target);
BlockDriverState *mirror_top_bs = s->mirror_top_bs;
Error *local_err = NULL;
+ bool abort = job->ret < 0;
+ int ret = 0;
+
+ if (s->prepared) {
+ return 0;
+ }
+ s->prepared = true;
bdrv_release_dirty_bitmap(src, s->dirty_bitmap);
- /* Make sure that the source BDS doesn't go away before we called
- * job_completed(). */
+ /* Make sure that the source BDS doesn't go away during bdrv_replace_node,
+ * before we can call bdrv_drained_end */
bdrv_ref(src);
bdrv_ref(mirror_top_bs);
bdrv_ref(target_bs);
* required before it could become a backing file of target_bs. */
bdrv_child_try_set_perm(mirror_top_bs->backing, 0, BLK_PERM_ALL,
&error_abort);
- if (s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) {
+ if (!abort && s->backing_mode == MIRROR_SOURCE_BACKING_CHAIN) {
BlockDriverState *backing = s->is_none_mode ? src : s->base;
if (backing_bs(target_bs) != backing) {
bdrv_set_backing_hd(target_bs, backing, &local_err);
if (local_err) {
error_report_err(local_err);
- data->ret = -EPERM;
+ ret = -EPERM;
}
}
}
aio_context_acquire(replace_aio_context);
}
- if (s->should_complete && data->ret == 0) {
- BlockDriverState *to_replace = src;
- if (s->to_replace) {
- to_replace = s->to_replace;
- }
+ if (s->should_complete && !abort) {
+ BlockDriverState *to_replace = s->to_replace ?: src;
if (bdrv_get_flags(target_bs) != bdrv_get_flags(to_replace)) {
bdrv_reopen(target_bs, bdrv_get_flags(to_replace), NULL);
bdrv_drained_end(target_bs);
if (local_err) {
error_report_err(local_err);
- data->ret = -EPERM;
+ ret = -EPERM;
}
}
if (s->to_replace) {
blk_insert_bs(bjob->blk, mirror_top_bs, &error_abort);
bs_opaque->job = NULL;
- job_completed(job, data->ret, NULL);
- g_free(data);
bdrv_drained_end(src);
bdrv_unref(mirror_top_bs);
bdrv_unref(src);
+
+ return ret;
+}
+
+static int mirror_prepare(Job *job)
+{
+ return mirror_exit_common(job);
+}
+
+static void mirror_abort(Job *job)
+{
+ int ret = mirror_exit_common(job);
+ assert(ret == 0);
}
static void mirror_throttle(MirrorBlockJob *s)
return ret;
}
-static void coroutine_fn mirror_run(void *opaque)
+static int coroutine_fn mirror_run(Job *job, Error **errp)
{
- MirrorBlockJob *s = opaque;
- MirrorExitData *data;
+ MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job);
BlockDriverState *bs = s->mirror_top_bs->backing->bs;
BlockDriverState *target_bs = blk_bs(s->target);
bool need_drain = true;
g_free(s->in_flight_bitmap);
bdrv_dirty_iter_free(s->dbi);
- data = g_malloc(sizeof(*data));
- data->ret = ret;
-
if (need_drain) {
bdrv_drained_begin(bs);
}
- job_defer_to_main_loop(&s->common.job, mirror_exit, data);
+
+ return ret;
}
static void mirror_complete(Job *job, Error **errp)
.free = block_job_free,
.user_resume = block_job_user_resume,
.drain = block_job_drain,
- .start = mirror_run,
+ .run = mirror_run,
+ .prepare = mirror_prepare,
+ .abort = mirror_abort,
.pause = mirror_pause,
.complete = mirror_complete,
},
.free = block_job_free,
.user_resume = block_job_user_resume,
.drain = block_job_drain,
- .start = mirror_run,
+ .run = mirror_run,
+ .prepare = mirror_prepare,
+ .abort = mirror_abort,
.pause = mirror_pause,
.complete = mirror_complete,
},
break;
case MIRROR_METHOD_DISCARD:
- ret = bdrv_co_pdiscard(bs->backing->bs, offset, bytes);
+ ret = bdrv_co_pdiscard(bs->backing, offset, bytes);
break;
default:
bs->backing->bs->filename);
}
-static void bdrv_mirror_top_close(BlockDriverState *bs)
-{
-}
-
static void bdrv_mirror_top_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
BlockReopenQueue *reopen_queue,
.bdrv_co_flush = bdrv_mirror_top_flush,
.bdrv_co_block_status = bdrv_co_block_status_from_backing,
.bdrv_refresh_filename = bdrv_mirror_top_refresh_filename,
- .bdrv_close = bdrv_mirror_top_close,
.bdrv_child_perm = bdrv_mirror_top_child_perm,
};
buf_size = DEFAULT_MIRROR_BUF_SIZE;
}
+ if (bs == target) {
+ error_setg(errp, "Can't mirror node into itself");
+ return;
+ }
+
/* In the case of active commit, add dummy driver to provide consistent
* reads on the top, while disabling it in the intermediate nodes, and make
* the backing chain writable. */
void mirror_start(const char *job_id, BlockDriverState *bs,
BlockDriverState *target, const char *replaces,
- int64_t speed, uint32_t granularity, int64_t buf_size,
+ int creation_flags, int64_t speed,
+ uint32_t granularity, int64_t buf_size,
MirrorSyncMode mode, BlockMirrorBackingMode backing_mode,
BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
}
is_none_mode = mode == MIRROR_SYNC_MODE_NONE;
base = mode == MIRROR_SYNC_MODE_TOP ? backing_bs(bs) : NULL;
- mirror_start_job(job_id, bs, JOB_DEFAULT, target, replaces,
+ mirror_start_job(job_id, bs, creation_flags, target, replaces,
speed, granularity, buf_size, backing_mode,
on_source_error, on_target_error, unmap, NULL, NULL,
&mirror_job_driver, is_none_mode, base, false,
projects / qemu.git / blobdiff