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authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>2020-03-11 13:30:01 +0300
committerMax Reitz <mreitz@redhat.com>2020-03-11 12:42:30 +0100
commitdafaf13593de240724a210e72da66f9d162735c3 (patch)
treef5cab9399e367e1ae2dc4e41a5a19adeca9a0140 /block
parent17187cb646913356bbd434bebdcddf43f92ce31a (diff)
block/block-copy: refactor interfaces to use bytes instead of end
We have a lot of "chunk_end - start" invocations, let's switch to bytes/cur_bytes scheme instead. While being here, improve check on block_copy_do_copy parameters to not overflow when calculating nbytes and use int64_t for bytes in block_copy for consistency. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200311103004.7649-7-vsementsov@virtuozzo.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/block-copy.c78
1 files changed, 41 insertions, 37 deletions
diff --git a/block/block-copy.c b/block/block-copy.c
index 251d415a2c..4c947e548b 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -26,12 +26,12 @@
static BlockCopyInFlightReq *find_conflicting_inflight_req(BlockCopyState *s,
int64_t start,
- int64_t end)
+ int64_t bytes)
{
BlockCopyInFlightReq *req;
QLIST_FOREACH(req, &s->inflight_reqs, list) {
- if (end > req->start_byte && start < req->end_byte) {
+ if (start + bytes > req->start && start < req->start + req->bytes) {
return req;
}
}
@@ -41,21 +41,21 @@ static BlockCopyInFlightReq *find_conflicting_inflight_req(BlockCopyState *s,
static void coroutine_fn block_copy_wait_inflight_reqs(BlockCopyState *s,
int64_t start,
- int64_t end)
+ int64_t bytes)
{
BlockCopyInFlightReq *req;
- while ((req = find_conflicting_inflight_req(s, start, end))) {
+ while ((req = find_conflicting_inflight_req(s, start, bytes))) {
qemu_co_queue_wait(&req->wait_queue, NULL);
}
}
static void block_copy_inflight_req_begin(BlockCopyState *s,
BlockCopyInFlightReq *req,
- int64_t start, int64_t end)
+ int64_t start, int64_t bytes)
{
- req->start_byte = start;
- req->end_byte = end;
+ req->start = start;
+ req->bytes = bytes;
qemu_co_queue_init(&req->wait_queue);
QLIST_INSERT_HEAD(&s->inflight_reqs, req, list);
}
@@ -153,24 +153,28 @@ void block_copy_set_progress_meter(BlockCopyState *s, ProgressMeter *pm)
/*
* block_copy_do_copy
*
- * Do copy of cluser-aligned chunk. @end is allowed to exceed s->len only to
- * cover last cluster when s->len is not aligned to clusters.
+ * Do copy of cluster-aligned chunk. Requested region is allowed to exceed
+ * s->len only to cover last cluster when s->len is not aligned to clusters.
*
* No sync here: nor bitmap neighter intersecting requests handling, only copy.
*
* Returns 0 on success.
*/
static int coroutine_fn block_copy_do_copy(BlockCopyState *s,
- int64_t start, int64_t end,
+ int64_t start, int64_t bytes,
bool zeroes, bool *error_is_read)
{
int ret;
- int nbytes = MIN(end, s->len) - start;
+ int64_t nbytes = MIN(start + bytes, s->len) - start;
void *bounce_buffer = NULL;
+ assert(start >= 0 && bytes > 0 && INT64_MAX - start >= bytes);
assert(QEMU_IS_ALIGNED(start, s->cluster_size));
- assert(QEMU_IS_ALIGNED(end, s->cluster_size));
- assert(end < s->len || end == QEMU_ALIGN_UP(s->len, s->cluster_size));
+ assert(QEMU_IS_ALIGNED(bytes, s->cluster_size));
+ assert(start < s->len);
+ assert(start + bytes <= s->len ||
+ start + bytes == QEMU_ALIGN_UP(s->len, s->cluster_size));
+ assert(nbytes < INT_MAX);
if (zeroes) {
ret = bdrv_co_pwrite_zeroes(s->target, start, nbytes, s->write_flags &
@@ -354,11 +358,10 @@ int64_t block_copy_reset_unallocated(BlockCopyState *s,
}
int coroutine_fn block_copy(BlockCopyState *s,
- int64_t start, uint64_t bytes,
+ int64_t start, int64_t bytes,
bool *error_is_read)
{
int ret = 0;
- int64_t end = bytes + start; /* bytes */
BlockCopyInFlightReq req;
/*
@@ -369,32 +372,32 @@ int coroutine_fn block_copy(BlockCopyState *s,
bdrv_get_aio_context(s->target->bs));
assert(QEMU_IS_ALIGNED(start, s->cluster_size));
- assert(QEMU_IS_ALIGNED(end, s->cluster_size));
+ assert(QEMU_IS_ALIGNED(bytes, s->cluster_size));
block_copy_wait_inflight_reqs(s, start, bytes);
- block_copy_inflight_req_begin(s, &req, start, end);
+ block_copy_inflight_req_begin(s, &req, start, bytes);
- while (start < end) {
- int64_t next_zero, chunk_end, status_bytes;
+ while (bytes) {
+ int64_t next_zero, cur_bytes, status_bytes;
if (!bdrv_dirty_bitmap_get(s->copy_bitmap, start)) {
trace_block_copy_skip(s, start);
start += s->cluster_size;
+ bytes -= s->cluster_size;
continue; /* already copied */
}
- chunk_end = MIN(end, start + s->copy_size);
+ cur_bytes = MIN(bytes, s->copy_size);
next_zero = bdrv_dirty_bitmap_next_zero(s->copy_bitmap, start,
- chunk_end - start);
+ cur_bytes);
if (next_zero >= 0) {
assert(next_zero > start); /* start is dirty */
- assert(next_zero < chunk_end); /* no need to do MIN() */
- chunk_end = next_zero;
+ assert(next_zero < start + cur_bytes); /* no need to do MIN() */
+ cur_bytes = next_zero - start;
}
- ret = block_copy_block_status(s, start, chunk_end - start,
- &status_bytes);
+ ret = block_copy_block_status(s, start, cur_bytes, &status_bytes);
if (s->skip_unallocated && !(ret & BDRV_BLOCK_ALLOCATED)) {
bdrv_reset_dirty_bitmap(s->copy_bitmap, start, status_bytes);
progress_set_remaining(s->progress,
@@ -402,30 +405,31 @@ int coroutine_fn block_copy(BlockCopyState *s,
s->in_flight_bytes);
trace_block_copy_skip_range(s, start, status_bytes);
start += status_bytes;
+ bytes -= status_bytes;
continue;
}
- chunk_end = MIN(chunk_end, start + status_bytes);
+ cur_bytes = MIN(cur_bytes, status_bytes);
trace_block_copy_process(s, start);
- bdrv_reset_dirty_bitmap(s->copy_bitmap, start, chunk_end - start);
- s->in_flight_bytes += chunk_end - start;
+ bdrv_reset_dirty_bitmap(s->copy_bitmap, start, cur_bytes);
+ s->in_flight_bytes += cur_bytes;
- co_get_from_shres(s->mem, chunk_end - start);
- ret = block_copy_do_copy(s, start, chunk_end, ret & BDRV_BLOCK_ZERO,
+ co_get_from_shres(s->mem, cur_bytes);
+ ret = block_copy_do_copy(s, start, cur_bytes, ret & BDRV_BLOCK_ZERO,
error_is_read);
- co_put_to_shres(s->mem, chunk_end - start);
- s->in_flight_bytes -= chunk_end - start;
+ co_put_to_shres(s->mem, cur_bytes);
+ s->in_flight_bytes -= cur_bytes;
if (ret < 0) {
- bdrv_set_dirty_bitmap(s->copy_bitmap, start, chunk_end - start);
+ bdrv_set_dirty_bitmap(s->copy_bitmap, start, cur_bytes);
break;
}
- progress_work_done(s->progress, chunk_end - start);
- s->progress_bytes_callback(chunk_end - start, s->progress_opaque);
- start = chunk_end;
- ret = 0;
+ progress_work_done(s->progress, cur_bytes);
+ s->progress_bytes_callback(cur_bytes, s->progress_opaque);
+ start += cur_bytes;
+ bytes -= cur_bytes;
}
block_copy_inflight_req_end(&req);