@@ -880,6 +880,10 @@ int bdrv_write(BlockDriverState *bs, int64_t sector_num,
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
}
+ if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
+ bs->wr_highest_sector = sector_num + nb_sectors - 1;
+ }
+
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
}
@@ -1530,6 +1534,35 @@ void bdrv_stats_print(Monitor *mon, const QObject *data)
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
}
+static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
+{
+ QObject *res;
+ QDict *dict;
+
+ res = qobject_from_jsonf("{ 'stats': {"
+ "'rd_bytes': %" PRId64 ","
+ "'wr_bytes': %" PRId64 ","
+ "'rd_operations': %" PRId64 ","
+ "'wr_operations': %" PRId64 ","
+ "'wr_highest_offset': %" PRId64
+ "} }",
+ bs->rd_bytes, bs->wr_bytes,
+ bs->rd_ops, bs->wr_ops,
+ bs->wr_highest_sector * 512);
+ dict = qobject_to_qdict(res);
+
+ if (*bs->device_name) {
+ qdict_put(dict, "device", qstring_from_str(bs->device_name));
+ }
+
+ if (bs->file) {
+ QObject *parent = bdrv_info_stats_bs(bs->file);
+ qdict_put_obj(dict, "parent", parent);
+ }
+
+ return res;
+}
+
/**
* bdrv_info_stats(): show block device statistics
*
@@ -1544,19 +1577,34 @@ void bdrv_stats_print(Monitor *mon, const QObject *data)
* - "wr_bytes": bytes written
* - "rd_operations": read operations
* - "wr_operations": write operations
- *
+ * - "wr_highest_offset": Highest offset of a sector written since the
+ * BlockDriverState has been opened
+ * - "parent": Contains recursively the statistics of the underlying
+ * protocol (e.g. the host file for a qcow2 image). If there is no
+ * underlying protocol, this field is omitted.
+ *
* Example:
*
* [ { "device": "ide0-hd0",
* "stats": { "rd_bytes": 512,
* "wr_bytes": 0,
* "rd_operations": 1,
- * "wr_operations": 0 } },
+ * "wr_operations": 0,
+ * "wr_highest_offset": 0,
+ * "parent": {
+ * "stats": { "rd_bytes": 1024,
+ * "wr_bytes": 0,
+ * "rd_operations": 2,
+ * "wr_operations": 0,
+ * "wr_highest_offset": 0,
+ * }
+ * } } },
* { "device": "ide1-cd0",
* "stats": { "rd_bytes": 0,
* "wr_bytes": 0,
* "rd_operations": 0,
- * "wr_operations": 0 } } ]
+ * "wr_operations": 0,
+ * "wr_highest_offset": 0 } },
*/
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
{
@@ -1567,15 +1615,7 @@ void bdrv_info_stats(Monitor *mon, QObject **ret_data)
devices = qlist_new();
QTAILQ_FOREACH(bs, &bdrv_states, list) {
- obj = qobject_from_jsonf("{ 'device': %s, 'stats': {"
- "'rd_bytes': %" PRId64 ","
- "'wr_bytes': %" PRId64 ","
- "'rd_operations': %" PRId64 ","
- "'wr_operations': %" PRId64
- "} }",
- bs->device_name,
- bs->rd_bytes, bs->wr_bytes,
- bs->rd_ops, bs->wr_ops);
+ obj = bdrv_info_stats_bs(bs);
qlist_append_obj(devices, obj);
}
@@ -1834,9 +1874,12 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
cb, opaque);
if (ret) {
- /* Update stats even though technically transfer has not happened. */
- bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
- bs->wr_ops ++;
+ /* Update stats even though technically transfer has not happened. */
+ bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
+ bs->wr_ops ++;
+ if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
+ bs->wr_highest_sector = sector_num + nb_sectors - 1;
+ }
}
return ret;
@@ -167,6 +167,7 @@ struct BlockDriverState {
uint64_t wr_bytes;
uint64_t rd_ops;
uint64_t wr_ops;
+ uint64_t wr_highest_sector;
/* Whether the disk can expand beyond total_sectors */
int growable;
This adds the wr_highest_sector blockstat which implements what is generally known as the high watermark. It is the highest offset of a sector written to the respective BlockDriverState since it has been opened. The query-blockstat QMP command is extended to add this value to the result, and also to add the statistics of the underlying protocol in a new "parent" field. Note that to get the "high watermark" of a qcow2 image, you need to look into the wr_highest_sector field of the parent (which can be a file, a host_device, ...). The wr_highest_sector of the qcow2 BlockDriverState itself is the highest offset on the _virtual_ disk that the guest has written to. Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- block.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++------------ block_int.h | 1 + 2 files changed, 59 insertions(+), 15 deletions(-)