STREAM_BUFFER_SIZE = 512 * 1024, /* in bytes */
};
-#define SLICE_TIME 100000000ULL /* ns */
-
typedef struct StreamBlockJob {
BlockJob common;
- RateLimit limit;
BlockDriverState *base;
BlockdevOnError on_error;
char *backing_file_str;
- int bs_flags;
+ bool bs_read_only;
+ bool chain_frozen;
} StreamBlockJob;
static int coroutine_fn stream_populate(BlockBackend *blk,
- int64_t sector_num, int nb_sectors,
+ int64_t offset, uint64_t bytes,
void *buf)
{
- struct iovec iov = {
- .iov_base = buf,
- .iov_len = nb_sectors * BDRV_SECTOR_SIZE,
- };
- QEMUIOVector qiov;
+ QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
- qemu_iovec_init_external(&qiov, &iov, 1);
+ assert(bytes < SIZE_MAX);
/* Copy-on-read the unallocated clusters */
- return blk_co_preadv(blk, sector_num * BDRV_SECTOR_SIZE, qiov.size, &qiov,
- BDRV_REQ_COPY_ON_READ);
+ return blk_co_preadv(blk, offset, qiov.size, &qiov, BDRV_REQ_COPY_ON_READ);
}
-typedef struct {
- int ret;
- bool reached_end;
-} StreamCompleteData;
+static void stream_abort(Job *job)
+{
+ StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
+
+ if (s->chain_frozen) {
+ BlockJob *bjob = &s->common;
+ bdrv_unfreeze_backing_chain(blk_bs(bjob->blk), s->base);
+ }
+}
-static void stream_complete(BlockJob *job, void *opaque)
+static int stream_prepare(Job *job)
{
- StreamBlockJob *s = container_of(job, StreamBlockJob, common);
- StreamCompleteData *data = opaque;
- BlockDriverState *bs = blk_bs(job->blk);
+ StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
+ BlockJob *bjob = &s->common;
+ BlockDriverState *bs = blk_bs(bjob->blk);
BlockDriverState *base = s->base;
Error *local_err = NULL;
+ int ret = 0;
- if (!block_job_is_cancelled(&s->common) && data->reached_end &&
- data->ret == 0) {
+ bdrv_unfreeze_backing_chain(bs, base);
+ s->chain_frozen = false;
+
+ if (bs->backing) {
const char *base_id = NULL, *base_fmt = NULL;
if (base) {
base_id = s->backing_file_str;
base_fmt = base->drv->format_name;
}
}
- data->ret = bdrv_change_backing_file(bs, base_id, base_fmt);
+ ret = bdrv_change_backing_file(bs, base_id, base_fmt);
bdrv_set_backing_hd(bs, base, &local_err);
if (local_err) {
error_report_err(local_err);
- data->ret = -EPERM;
- goto out;
+ return -EPERM;
}
}
-out:
+ return ret;
+}
+
+static void stream_clean(Job *job)
+{
+ StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
+ BlockJob *bjob = &s->common;
+ BlockDriverState *bs = blk_bs(bjob->blk);
+
/* Reopen the image back in read-only mode if necessary */
- if (s->bs_flags != bdrv_get_flags(bs)) {
+ if (s->bs_read_only) {
/* Give up write permissions before making it read-only */
- blk_set_perm(job->blk, 0, BLK_PERM_ALL, &error_abort);
- bdrv_reopen(bs, s->bs_flags, NULL);
+ blk_set_perm(bjob->blk, 0, BLK_PERM_ALL, &error_abort);
+ bdrv_reopen_set_read_only(bs, true, NULL);
}
g_free(s->backing_file_str);
- block_job_completed(&s->common, data->ret);
- g_free(data);
}
-static void coroutine_fn stream_run(void *opaque)
+static int coroutine_fn stream_run(Job *job, Error **errp)
{
- StreamBlockJob *s = opaque;
- StreamCompleteData *data;
+ StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
BlockBackend *blk = s->common.blk;
BlockDriverState *bs = blk_bs(blk);
BlockDriverState *base = s->base;
- int64_t sector_num = 0;
- int64_t end = -1;
+ int64_t len;
+ int64_t offset = 0;
uint64_t delay_ns = 0;
int error = 0;
int ret = 0;
- int n = 0;
+ int64_t n = 0; /* bytes */
void *buf;
if (!bs->backing) {
goto out;
}
- s->common.len = bdrv_getlength(bs);
- if (s->common.len < 0) {
- ret = s->common.len;
+ len = bdrv_getlength(bs);
+ if (len < 0) {
+ ret = len;
goto out;
}
+ job_progress_set_remaining(&s->common.job, len);
- end = s->common.len >> BDRV_SECTOR_BITS;
buf = qemu_blockalign(bs, STREAM_BUFFER_SIZE);
/* Turn on copy-on-read for the whole block device so that guest read
bdrv_enable_copy_on_read(bs);
}
- for (sector_num = 0; sector_num < end; sector_num += n) {
+ for ( ; 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, QEMU_CLOCK_REALTIME, 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 = false;
- ret = bdrv_is_allocated(bs, sector_num,
- STREAM_BUFFER_SIZE / BDRV_SECTOR_SIZE, &n);
+ ret = bdrv_is_allocated(bs, offset, STREAM_BUFFER_SIZE, &n);
if (ret == 1) {
/* Allocated in the top, no need to copy. */
} else if (ret >= 0) {
/* Copy if allocated in the intermediate images. Limit to the
- * known-unallocated area [sector_num, sector_num+n). */
+ * known-unallocated area [offset, offset+n*BDRV_SECTOR_SIZE). */
ret = bdrv_is_allocated_above(backing_bs(bs), base,
- sector_num, n, &n);
+ offset, n, &n);
/* Finish early if end of backing file has been reached */
if (ret == 0 && n == 0) {
- n = end - sector_num;
+ n = len - offset;
}
copy = (ret == 1);
}
- trace_stream_one_iteration(s, sector_num, n, ret);
+ trace_stream_one_iteration(s, offset, n, ret);
if (copy) {
- ret = stream_populate(blk, sector_num, n, buf);
+ ret = stream_populate(blk, offset, n, buf);
}
if (ret < 0) {
BlockErrorAction action =
ret = 0;
/* Publish progress */
- s->common.offset += n * BDRV_SECTOR_SIZE;
- if (copy && s->common.speed) {
- delay_ns = ratelimit_calculate_delay(&s->limit, n);
+ job_progress_update(&s->common.job, n);
+ if (copy) {
+ delay_ns = block_job_ratelimit_get_delay(&s->common, n);
+ } else {
+ delay_ns = 0;
}
}
out:
/* Modify backing chain and close BDSes in main loop */
- data = g_malloc(sizeof(*data));
- data->ret = ret;
- data->reached_end = sector_num == end;
- block_job_defer_to_main_loop(&s->common, stream_complete, data);
-}
-
-static void stream_set_speed(BlockJob *job, int64_t speed, Error **errp)
-{
- StreamBlockJob *s = container_of(job, StreamBlockJob, common);
-
- if (speed < 0) {
- error_setg(errp, QERR_INVALID_PARAMETER, "speed");
- return;
- }
- ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
+ return ret;
}
static const BlockJobDriver stream_job_driver = {
- .instance_size = sizeof(StreamBlockJob),
- .job_type = BLOCK_JOB_TYPE_STREAM,
- .set_speed = stream_set_speed,
- .start = stream_run,
+ .job_driver = {
+ .instance_size = sizeof(StreamBlockJob),
+ .job_type = JOB_TYPE_STREAM,
+ .free = block_job_free,
+ .run = stream_run,
+ .prepare = stream_prepare,
+ .abort = stream_abort,
+ .clean = stream_clean,
+ .user_resume = block_job_user_resume,
+ .drain = block_job_drain,
+ },
};
void stream_start(const char *job_id, BlockDriverState *bs,
BlockDriverState *base, const char *backing_file_str,
- int64_t speed, BlockdevOnError on_error, Error **errp)
+ int creation_flags, int64_t speed,
+ BlockdevOnError on_error, Error **errp)
{
StreamBlockJob *s;
BlockDriverState *iter;
- int orig_bs_flags;
+ bool bs_read_only;
/* Make sure that the image is opened in read-write mode */
- orig_bs_flags = bdrv_get_flags(bs);
- if (!(orig_bs_flags & BDRV_O_RDWR)) {
- if (bdrv_reopen(bs, orig_bs_flags | BDRV_O_RDWR, errp) != 0) {
+ bs_read_only = bdrv_is_read_only(bs);
+ if (bs_read_only) {
+ if (bdrv_reopen_set_read_only(bs, false, errp) != 0) {
return;
}
}
/* Prevent concurrent jobs trying to modify the graph structure here, we
* already have our own plans. Also don't allow resize as the image size is
* queried only at the job start and then cached. */
- s = block_job_create(job_id, &stream_job_driver, bs,
+ s = block_job_create(job_id, &stream_job_driver, NULL, bs,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
BLK_PERM_GRAPH_MOD,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
BLK_PERM_WRITE,
- speed, BLOCK_JOB_DEFAULT, NULL, NULL, errp);
+ speed, creation_flags, NULL, NULL, errp);
if (!s) {
goto fail;
}
&error_abort);
}
+ if (bdrv_freeze_backing_chain(bs, base, errp) < 0) {
+ job_early_fail(&s->common.job);
+ goto fail;
+ }
+
s->base = base;
s->backing_file_str = g_strdup(backing_file_str);
- s->bs_flags = orig_bs_flags;
+ s->bs_read_only = bs_read_only;
+ s->chain_frozen = true;
s->on_error = on_error;
trace_stream_start(bs, base, s);
- block_job_start(&s->common);
+ job_start(&s->common.job);
return;
fail:
- if (orig_bs_flags != bdrv_get_flags(bs)) {
- bdrv_reopen(bs, orig_bs_flags, NULL);
+ if (bs_read_only) {
+ bdrv_reopen_set_read_only(bs, true, NULL);
}
}
projects / mirror_qemu.git / blobdiff