*/
#include "trace.h"
-#include "block_int.h"
+#include "block/block_int.h"
+#include "block/blockjob.h"
+#include "qemu/ratelimit.h"
enum {
/*
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_id[1024];
} StreamBlockJob;
static int coroutine_fn stream_populate(BlockDriverState *bs,
return bdrv_co_copy_on_readv(bs, sector_num, nb_sectors, &qiov);
}
+static void close_unused_images(BlockDriverState *top, BlockDriverState *base,
+ const char *base_id)
+{
+ BlockDriverState *intermediate;
+ intermediate = top->backing_hd;
+
+ while (intermediate) {
+ BlockDriverState *unused;
+
+ /* reached base */
+ if (intermediate == base) {
+ break;
+ }
+
+ unused = intermediate;
+ intermediate = intermediate->backing_hd;
+ unused->backing_hd = NULL;
+ bdrv_delete(unused);
+ }
+ top->backing_hd = base;
+}
+
static void coroutine_fn stream_run(void *opaque)
{
StreamBlockJob *s = opaque;
BlockDriverState *bs = s->common.bs;
+ BlockDriverState *base = s->base;
int64_t sector_num, end;
+ int error = 0;
int ret = 0;
- int n;
+ int n = 0;
void *buf;
s->common.len = bdrv_getlength(bs);
if (s->common.len < 0) {
- block_job_complete(&s->common, s->common.len);
+ block_job_completed(&s->common, s->common.len);
return;
}
}
for (sector_num = 0; sector_num < end; sector_num += n) {
+ uint64_t delay_ns = 0;
+ bool copy;
+
+wait:
+ /* 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, rt_clock, delay_ns);
if (block_job_is_cancelled(&s->common)) {
break;
}
- /* TODO rate-limit */
- /* Note that even when no rate limit is applied we need to yield with
- * no pending I/O here so that qemu_aio_flush() is able to return.
- */
- co_sleep_ns(rt_clock, 0);
-
ret = bdrv_co_is_allocated(bs, sector_num,
STREAM_BUFFER_SIZE / BDRV_SECTOR_SIZE, &n);
+ if (ret == 1) {
+ /* Allocated in the top, no need to copy. */
+ copy = false;
+ } else {
+ /* Copy if allocated in the intermediate images. Limit to the
+ * known-unallocated area [sector_num, sector_num+n). */
+ ret = bdrv_co_is_allocated_above(bs->backing_hd, base,
+ sector_num, n, &n);
+
+ /* Finish early if end of backing file has been reached */
+ if (ret == 0 && n == 0) {
+ n = end - sector_num;
+ }
+
+ copy = (ret == 1);
+ }
trace_stream_one_iteration(s, sector_num, n, ret);
- if (ret == 0) {
+ if (ret >= 0 && copy) {
+ if (s->common.speed) {
+ delay_ns = ratelimit_calculate_delay(&s->limit, n);
+ if (delay_ns > 0) {
+ goto wait;
+ }
+ }
ret = stream_populate(bs, sector_num, n, buf);
}
if (ret < 0) {
- break;
+ BlockErrorAction action =
+ block_job_error_action(&s->common, s->common.bs, s->on_error,
+ true, -ret);
+ if (action == BDRV_ACTION_STOP) {
+ n = 0;
+ continue;
+ }
+ if (error == 0) {
+ error = ret;
+ }
+ if (action == BDRV_ACTION_REPORT) {
+ break;
+ }
}
+ ret = 0;
/* Publish progress */
s->common.offset += n * BDRV_SECTOR_SIZE;
bdrv_disable_copy_on_read(bs);
}
- if (sector_num == end && ret == 0) {
- ret = bdrv_change_backing_file(bs, NULL, NULL);
+ /* Do not remove the backing file if an error was there but ignored. */
+ ret = error;
+
+ if (!block_job_is_cancelled(&s->common) && sector_num == end && ret == 0) {
+ const char *base_id = NULL, *base_fmt = NULL;
+ if (base) {
+ base_id = s->backing_file_id;
+ if (base->drv) {
+ base_fmt = base->drv->format_name;
+ }
+ }
+ ret = bdrv_change_backing_file(bs, base_id, base_fmt);
+ close_unused_images(bs, base, base_id);
}
qemu_vfree(buf);
- block_job_complete(&s->common, ret);
+ block_job_completed(&s->common, ret);
+}
+
+static void stream_set_speed(BlockJob *job, int64_t speed, Error **errp)
+{
+ StreamBlockJob *s = container_of(job, StreamBlockJob, common);
+
+ if (speed < 0) {
+ error_set(errp, QERR_INVALID_PARAMETER, "speed");
+ return;
+ }
+ ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
}
static BlockJobType stream_job_type = {
.instance_size = sizeof(StreamBlockJob),
.job_type = "stream",
+ .set_speed = stream_set_speed,
};
-int stream_start(BlockDriverState *bs, BlockDriverState *base,
- BlockDriverCompletionFunc *cb, void *opaque)
+void stream_start(BlockDriverState *bs, BlockDriverState *base,
+ const char *base_id, int64_t speed,
+ BlockdevOnError on_error,
+ BlockDriverCompletionFunc *cb,
+ void *opaque, Error **errp)
{
StreamBlockJob *s;
- Coroutine *co;
- s = block_job_create(&stream_job_type, bs, cb, opaque);
+ if ((on_error == BLOCKDEV_ON_ERROR_STOP ||
+ on_error == BLOCKDEV_ON_ERROR_ENOSPC) &&
+ !bdrv_iostatus_is_enabled(bs)) {
+ error_set(errp, QERR_INVALID_PARAMETER, "on-error");
+ return;
+ }
+
+ s = block_job_create(&stream_job_type, bs, speed, cb, opaque, errp);
if (!s) {
- return -EBUSY; /* bs must already be in use */
+ return;
}
s->base = base;
+ if (base_id) {
+ pstrcpy(s->backing_file_id, sizeof(s->backing_file_id), base_id);
+ }
- co = qemu_coroutine_create(stream_run);
- trace_stream_start(bs, base, s, co, opaque);
- qemu_coroutine_enter(co, s);
- return 0;
+ s->on_error = on_error;
+ s->common.co = qemu_coroutine_create(stream_run);
+ trace_stream_start(bs, base, s, s->common.co, opaque);
+ qemu_coroutine_enter(s->common.co, s);
}
projects / qemu.git / blobdiff