[RFC v4 2/9] qemu-io: add zoned block device operations.

[Sam Li]

Add zoned storage commands of the device: zone_open(zo), zone_close(zc),
zone_reset(zs), zone_report(zp), zone_finish(zf).

For example, it can be called by:
./build/qemu-io --image-opts driver=zoned_host_device, filename=/dev/nullb0
-c "zone_report 0 0 1"

Signed-off-by: Sam Li <faithilikerun@gmail.com>
---
 block/io.c               |  57 ++++++++++++++++
 include/block/block-io.h |  13 ++++
 qemu-io-cmds.c           | 143 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 213 insertions(+)

diff --git a/block/io.c b/block/io.c
index 1e9bf09a49..a760be0131 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3243,6 +3243,63 @@ out:
     return co.ret;
 }
 
+int bdrv_co_zone_report(BlockDriverState *bs, int64_t offset,
+                        int64_t *nr_zones,
+                        BlockZoneDescriptor *zones)
+{
+    BlockDriver *drv = bs->drv;
+    CoroutineIOCompletion co = {
+            .coroutine = qemu_coroutine_self(),
+    };
+    IO_CODE();
+
+    bdrv_inc_in_flight(bs);
+    if (!drv || (!drv->bdrv_co_zone_report)) {
+        co.ret = -ENOTSUP;
+        goto out;
+    }
+
+    if (drv->bdrv_co_zone_report) {
+        co.ret = drv->bdrv_co_zone_report(bs, offset, nr_zones, zones);
+    } else {
+        co.ret = -ENOTSUP;
+        goto out;
+        qemu_coroutine_yield();
+    }
+
+out:
+    bdrv_dec_in_flight(bs);
+    return co.ret;
+}
+
+int bdrv_co_zone_mgmt(BlockDriverState *bs, enum zone_op op,
+        int64_t offset, int64_t len)
+{
+    BlockDriver *drv = bs->drv;
+    CoroutineIOCompletion co = {
+            .coroutine = qemu_coroutine_self(),
+    };
+    IO_CODE();
+
+    bdrv_inc_in_flight(bs);
+    if (!drv || (!drv->bdrv_co_zone_mgmt)) {
+        co.ret = -ENOTSUP;
+        goto out;
+    }
+
+    if (drv->bdrv_co_zone_mgmt) {
+        co.ret = drv->bdrv_co_zone_mgmt(bs, op, offset, len);
+    } else {
+        co.ret = -ENOTSUP;
+        goto out;
+        qemu_coroutine_yield();
+    }
+
+out:
+    bdrv_dec_in_flight(bs);
+    return co.ret;
+}
+
 void *qemu_blockalign(BlockDriverState *bs, size_t size)
 {
     IO_CODE();
diff --git a/include/block/block-io.h b/include/block/block-io.h
index 053a27141a..a0ae140452 100644
--- a/include/block/block-io.h
+++ b/include/block/block-io.h
@@ -80,6 +80,13 @@ int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf);
 /* Ensure contents are flushed to disk.  */
 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
 
+/* Report zone information of zone block device. */
+int coroutine_fn bdrv_co_zone_report(BlockDriverState *bs, int64_t offset,
+                                     int64_t *nr_zones,
+                                     BlockZoneDescriptor *zones);
+int coroutine_fn bdrv_co_zone_mgmt(BlockDriverState *bs, zone_op op,
+                                   int64_t offset, int64_t len);
+
 int bdrv_co_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes);
 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 int bdrv_block_status(BlockDriverState *bs, int64_t offset,
@@ -289,6 +296,12 @@ bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector 
*qiov, int64_t pos);
 int generated_co_wrapper
 bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
 
+int generated_co_wrapper
+blk_zone_report(BlockBackend *blk, int64_t offset, int64_t *nr_zones,
+                BlockZoneDescriptor *zones);
+int generated_co_wrapper
+blk_zone_mgmt(BlockBackend *blk, enum zone_op op, int64_t offset, int64_t len);
+
 /**
  * bdrv_parent_drained_begin_single:
  *
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 2f0d8ac25a..a88fa322d2 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -1706,6 +1706,144 @@ static const cmdinfo_t flush_cmd = {
     .oneline    = "flush all in-core file state to disk",
 };
 
+static int zone_report_f(BlockBackend *blk, int argc, char **argv)
+{
+    int ret;
+    int64_t offset, nr_zones;
+
+    ++optind;
+    offset = cvtnum(argv[optind]);
+    ++optind;
+    nr_zones = cvtnum(argv[optind]);
+
+    g_autofree BlockZoneDescriptor *zones = NULL;
+    zones = g_new(BlockZoneDescriptor, nr_zones);
+    ret = blk_zone_report(blk, offset, &nr_zones, zones);
+    if (ret < 0) {
+        printf("zone report failed: %s\n", strerror(-ret));
+    } else {
+        for (int i = 0; i < nr_zones; ++i) {
+            printf("start: 0x%" PRIx64 ", len 0x%" PRIx64 ", "
+                   "cap"" 0x%" PRIx64 ",wptr 0x%" PRIx64 ", "
+                   "zcond:%u, [type: %u]\n",
+                   zones[i].start, zones[i].length, zones[i].cap, zones[i].wp,
+                   zones[i].cond, zones[i].type);
+        }
+    }
+    return ret;
+}
+
+static const cmdinfo_t zone_report_cmd = {
+        .name = "zone_report",
+        .altname = "zp",
+        .cfunc = zone_report_f,
+        .argmin = 2,
+        .argmax = 2,
+        .args = "offset number",
+        .oneline = "report zone information",
+};
+
+static int zone_open_f(BlockBackend *blk, int argc, char **argv)
+{
+    int ret;
+    int64_t offset, len;
+    ++optind;
+    offset = cvtnum(argv[optind]);
+    ++optind;
+    len = cvtnum(argv[optind]);
+    ret = blk_zone_mgmt(blk, zone_open, offset, len);
+    if (ret < 0) {
+        printf("zone open failed: %s\n", strerror(-ret));
+    }
+    return ret;
+}
+
+static const cmdinfo_t zone_open_cmd = {
+        .name = "zone_open",
+        .altname = "zo",
+        .cfunc = zone_open_f,
+        .argmin = 2,
+        .argmax = 2,
+        .args = "offset len",
+        .oneline = "explicit open a range of zones in zone block device",
+};
+
+static int zone_close_f(BlockBackend *blk, int argc, char **argv)
+{
+    int ret;
+    int64_t offset, len;
+    ++optind;
+    offset = cvtnum(argv[optind]);
+    ++optind;
+    len = cvtnum(argv[optind]);
+    ret = blk_zone_mgmt(blk, zone_close, offset, len);
+    if (ret < 0) {
+        printf("zone close failed: %s\n", strerror(-ret));
+    }
+    return ret;
+}
+
+static const cmdinfo_t zone_close_cmd = {
+        .name = "zone_close",
+        .altname = "zc",
+        .cfunc = zone_close_f,
+        .argmin = 2,
+        .argmax = 2,
+        .args = "offset len",
+        .oneline = "close a range of zones in zone block device",
+};
+
+static int zone_finish_f(BlockBackend *blk, int argc, char **argv)
+{
+    int ret;
+    int64_t offset, len;
+    ++optind;
+    offset = cvtnum(argv[optind]);
+    ++optind;
+    len = cvtnum(argv[optind]);
+    ret = blk_zone_mgmt(blk, zone_finish, offset, len);
+    if (ret < 0) {
+        printf("zone finish failed: %s\n", strerror(-ret));
+    }
+    return ret;
+}
+
+static const cmdinfo_t zone_finish_cmd = {
+        .name = "zone_finish",
+        .altname = "zf",
+        .cfunc = zone_finish_f,
+        .argmin = 2,
+        .argmax = 2,
+        .args = "offset len",
+        .oneline = "finish a range of zones in zone block device",
+};
+
+static int zone_reset_f(BlockBackend *blk, int argc, char **argv)
+{
+    int ret;
+    int64_t offset, len;
+    ++optind;
+    offset = cvtnum(argv[optind]);
+    ++optind;
+    len = cvtnum(argv[optind]);
+    ret = blk_zone_mgmt(blk, zone_reset, offset, len);
+    if (ret < 0) {
+        printf("zone reset failed: %s\n", strerror(-ret));
+    }
+    return ret;
+}
+
+static const cmdinfo_t zone_reset_cmd = {
+        .name = "zone_reset",
+        .altname = "zrs",
+        .cfunc = zone_reset_f,
+        .argmin = 2,
+        .argmax = 2,
+        .args = "offset len",
+        .oneline = "reset a zone write pointer in zone block device",
+};
+
+
 static int truncate_f(BlockBackend *blk, int argc, char **argv);
 static const cmdinfo_t truncate_cmd = {
     .name       = "truncate",
@@ -2498,6 +2636,11 @@ static void __attribute((constructor)) 
init_qemuio_commands(void)
     qemuio_add_command(&aio_write_cmd);
     qemuio_add_command(&aio_flush_cmd);
     qemuio_add_command(&flush_cmd);
+    qemuio_add_command(&zone_report_cmd);
+    qemuio_add_command(&zone_open_cmd);
+    qemuio_add_command(&zone_close_cmd);
+    qemuio_add_command(&zone_finish_cmd);
+    qemuio_add_command(&zone_reset_cmd);
     qemuio_add_command(&truncate_cmd);
     qemuio_add_command(&length_cmd);
     qemuio_add_command(&info_cmd);
-- 
2.36.1