COMMIT_BUFFER_SIZE = 512 * 1024, /* in bytes */
};
-#define SLICE_TIME 100000000ULL /* ns */
-
typedef struct CommitBlockJob {
BlockJob common;
- RateLimit limit;
BlockDriverState *commit_top_bs;
BlockBackend *top;
BlockBackend *base;
+ BlockDriverState *base_bs;
BlockdevOnError on_error;
int base_flags;
char *backing_file_str;
return 0;
}
-typedef struct {
- int ret;
-} CommitCompleteData;
-
-static void commit_complete(BlockJob *job, void *opaque)
+static int commit_prepare(Job *job)
{
- CommitBlockJob *s = container_of(job, CommitBlockJob, common);
- CommitCompleteData *data = opaque;
- BlockDriverState *top = blk_bs(s->top);
- BlockDriverState *base = blk_bs(s->base);
- BlockDriverState *commit_top_bs = s->commit_top_bs;
- int ret = data->ret;
- bool remove_commit_top_bs = false;
-
- /* Make sure commit_top_bs and top stay around until bdrv_replace_node() */
- bdrv_ref(top);
- bdrv_ref(commit_top_bs);
+ CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
/* Remove base node parent that still uses BLK_PERM_WRITE/RESIZE before
* the normal backing chain can be restored. */
blk_unref(s->base);
+ s->base = NULL;
+
+ /* FIXME: bdrv_drop_intermediate treats total failures and partial failures
+ * identically. Further work is needed to disambiguate these cases. */
+ return bdrv_drop_intermediate(s->commit_top_bs, s->base_bs,
+ s->backing_file_str);
+}
+
+static void commit_abort(Job *job)
+{
+ CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
+ BlockDriverState *top_bs = blk_bs(s->top);
- if (!block_job_is_cancelled(&s->common) && ret == 0) {
- /* success */
- ret = bdrv_drop_intermediate(s->commit_top_bs, base,
- s->backing_file_str);
- } else {
- /* XXX Can (or should) we somehow keep 'consistent read' blocked even
- * after the failed/cancelled commit job is gone? If we already wrote
- * something to base, the intermediate images aren't valid any more. */
- remove_commit_top_bs = true;
+ /* Make sure commit_top_bs and top stay around until bdrv_replace_node() */
+ bdrv_ref(top_bs);
+ bdrv_ref(s->commit_top_bs);
+
+ if (s->base) {
+ blk_unref(s->base);
}
+ /* free the blockers on the intermediate nodes so that bdrv_replace_nodes
+ * can succeed */
+ block_job_remove_all_bdrv(&s->common);
+
+ /* If bdrv_drop_intermediate() failed (or was not invoked), remove the
+ * commit filter driver from the backing chain now. Do this as the final
+ * step so that the 'consistent read' permission can be granted.
+ *
+ * XXX Can (or should) we somehow keep 'consistent read' blocked even
+ * after the failed/cancelled commit job is gone? If we already wrote
+ * something to base, the intermediate images aren't valid any more. */
+ bdrv_child_try_set_perm(s->commit_top_bs->backing, 0, BLK_PERM_ALL,
+ &error_abort);
+ bdrv_replace_node(s->commit_top_bs, backing_bs(s->commit_top_bs),
+ &error_abort);
+
+ bdrv_unref(s->commit_top_bs);
+ bdrv_unref(top_bs);
+}
+
+static void commit_clean(Job *job)
+{
+ CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
+
/* restore base open flags here if appropriate (e.g., change the base back
* to r/o). These reopens do not need to be atomic, since we won't abort
* even on failure here */
- if (s->base_flags != bdrv_get_flags(base)) {
- bdrv_reopen(base, s->base_flags, NULL);
+ if (s->base_flags != bdrv_get_flags(s->base_bs)) {
+ bdrv_reopen(s->base_bs, s->base_flags, NULL);
}
+
g_free(s->backing_file_str);
blk_unref(s->top);
-
- /* If there is more than one reference to the job (e.g. if called from
- * block_job_finish_sync()), block_job_completed() won't free it and
- * therefore the blockers on the intermediate nodes remain. This would
- * cause bdrv_set_backing_hd() to fail. */
- block_job_remove_all_bdrv(job);
-
- block_job_completed(&s->common, ret);
- g_free(data);
-
- /* If bdrv_drop_intermediate() didn't already do that, remove the commit
- * filter driver from the backing chain. Do this as the final step so that
- * the 'consistent read' permission can be granted. */
- if (remove_commit_top_bs) {
- bdrv_child_try_set_perm(commit_top_bs->backing, 0, BLK_PERM_ALL,
- &error_abort);
- bdrv_replace_node(commit_top_bs, backing_bs(commit_top_bs),
- &error_abort);
- }
-
- bdrv_unref(commit_top_bs);
- bdrv_unref(top);
}
-static void coroutine_fn commit_run(void *opaque)
+static int coroutine_fn commit_run(Job *job, Error **errp)
{
- CommitBlockJob *s = opaque;
- CommitCompleteData *data;
+ CommitBlockJob *s = container_of(job, CommitBlockJob, common.job);
int64_t offset;
uint64_t delay_ns = 0;
int ret = 0;
int64_t n = 0; /* bytes */
void *buf = NULL;
int bytes_written = 0;
- int64_t base_len;
-
- ret = s->common.len = blk_getlength(s->top);
+ int64_t len, base_len;
- if (s->common.len < 0) {
+ ret = len = blk_getlength(s->top);
+ if (len < 0) {
goto out;
}
+ job_progress_set_remaining(&s->common.job, len);
ret = base_len = blk_getlength(s->base);
if (base_len < 0) {
goto out;
}
- if (base_len < s->common.len) {
- ret = blk_truncate(s->base, s->common.len, PREALLOC_MODE_OFF, NULL);
+ if (base_len < len) {
+ ret = blk_truncate(s->base, len, PREALLOC_MODE_OFF, NULL);
if (ret) {
goto out;
}
buf = blk_blockalign(s->top, COMMIT_BUFFER_SIZE);
- for (offset = 0; offset < s->common.len; offset += n) {
+ for (offset = 0; offset < len; offset += n) {
bool copy;
/* Note that even when no rate limit is applied we need to yield
* with no pending I/O here so that bdrv_drain_all() returns.
*/
- block_job_sleep_ns(&s->common, delay_ns);
- if (block_job_is_cancelled(&s->common)) {
+ job_sleep_ns(&s->common.job, delay_ns);
+ if (job_is_cancelled(&s->common.job)) {
break;
}
/* Copy if allocated above the base */
}
}
/* Publish progress */
- s->common.offset += n;
+ job_progress_update(&s->common.job, n);
- if (copy && s->common.speed) {
- delay_ns = ratelimit_calculate_delay(&s->limit, n);
+ if (copy) {
+ delay_ns = block_job_ratelimit_get_delay(&s->common, n);
+ } else {
+ delay_ns = 0;
}
}
out:
qemu_vfree(buf);
- data = g_malloc(sizeof(*data));
- data->ret = ret;
- block_job_defer_to_main_loop(&s->common, commit_complete, data);
-}
-
-static void commit_set_speed(BlockJob *job, int64_t speed, Error **errp)
-{
- CommitBlockJob *s = container_of(job, CommitBlockJob, common);
-
- if (speed < 0) {
- error_setg(errp, QERR_INVALID_PARAMETER, "speed");
- return;
- }
- ratelimit_set_speed(&s->limit, speed, SLICE_TIME);
+ return ret;
}
static const BlockJobDriver commit_job_driver = {
- .instance_size = sizeof(CommitBlockJob),
- .job_type = BLOCK_JOB_TYPE_COMMIT,
- .set_speed = commit_set_speed,
- .start = commit_run,
+ .job_driver = {
+ .instance_size = sizeof(CommitBlockJob),
+ .job_type = JOB_TYPE_COMMIT,
+ .free = block_job_free,
+ .user_resume = block_job_user_resume,
+ .drain = block_job_drain,
+ .run = commit_run,
+ .prepare = commit_prepare,
+ .abort = commit_abort,
+ .clean = commit_clean
+ },
};
static int coroutine_fn bdrv_commit_top_preadv(BlockDriverState *bs,
bs->backing->bs->filename);
}
-static void bdrv_commit_top_close(BlockDriverState *bs)
-{
-}
-
static void bdrv_commit_top_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
BlockReopenQueue *reopen_queue,
static BlockDriver bdrv_commit_top = {
.format_name = "commit_top",
.bdrv_co_preadv = bdrv_commit_top_preadv,
- .bdrv_co_get_block_status = bdrv_co_get_block_status_from_backing,
+ .bdrv_co_block_status = bdrv_co_block_status_from_backing,
.bdrv_refresh_filename = bdrv_commit_top_refresh_filename,
- .bdrv_close = bdrv_commit_top_close,
.bdrv_child_perm = bdrv_commit_top_child_perm,
};
void commit_start(const char *job_id, BlockDriverState *bs,
- BlockDriverState *base, BlockDriverState *top, int64_t speed,
+ BlockDriverState *base, BlockDriverState *top,
+ int creation_flags, int64_t speed,
BlockdevOnError on_error, const char *backing_file_str,
const char *filter_node_name, Error **errp)
{
return;
}
- s = block_job_create(job_id, &commit_job_driver, bs, 0, BLK_PERM_ALL,
- speed, BLOCK_JOB_DEFAULT, NULL, NULL, errp);
+ s = block_job_create(job_id, &commit_job_driver, NULL, bs, 0, BLK_PERM_ALL,
+ speed, creation_flags, NULL, NULL, errp);
if (!s) {
return;
}
if (ret < 0) {
goto fail;
}
+ s->base_bs = base;
/* Required permissions are already taken with block_job_add_bdrv() */
s->top = blk_new(0, BLK_PERM_ALL);
s->on_error = on_error;
trace_commit_start(bs, base, top, s);
- block_job_start(&s->common);
+ job_start(&s->common.job);
return;
fail:
if (commit_top_bs) {
bdrv_replace_node(commit_top_bs, top, &error_abort);
}
- block_job_early_fail(&s->common);
+ job_early_fail(&s->common.job);
}
projects / qemu.git / blobdiff