To configure the zoned format feature on the qcow2 driver, it
requires settings as: the device size, zone model, zone size,
zone capacity, number of conventional zones, limits on zone
resources (max append bytes, max open zones, and max_active_zones).
To create a qcow2 image with zoned format feature, use command like
this:
qemu-img create -f qcow2 zbc.qcow2 -o size=768M \
-o zone.size=64M -o zone.capacity=64M -o zone.conventional_zones=0 \
-o zone.max_append_bytes=4096 -o zone.max_open_zones=6 \
-o zone.max_active_zones=8 -o zone.mode=host-managed
Signed-off-by: Sam Li <faithilike...@gmail.com>
---
block/file-posix.c | 2 +-
block/qcow2.c | 264 ++++++++++++++++++++++++++++++-
block/qcow2.h | 32 +++-
docs/interop/qcow2.txt | 107 ++++++++++++-
include/block/block_int-common.h | 15 +-
qapi/block-core.json | 69 +++++++-
6 files changed, 481 insertions(+), 8 deletions(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index ff928b5e85..0a78c8a1ce 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -3523,7 +3523,7 @@ static int coroutine_fn
raw_co_zone_append(BlockDriverState *bs,
if (*offset & zone_size_mask) {
error_report("sector offset %" PRId64 " is not aligned to zone size "
- "%" PRId32 "", *offset / 512, bs->bl.zone_size / 512);
+ "%" PRId64 "", *offset / 512, bs->bl.zone_size / 512);
return -EINVAL;
}
diff --git a/block/qcow2.c b/block/qcow2.c
index 803ca73a2f..f0fd9d79a2 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -73,6 +73,7 @@ typedef struct {
#define QCOW2_EXT_MAGIC_CRYPTO_HEADER 0x0537be77
#define QCOW2_EXT_MAGIC_BITMAPS 0x23852875
#define QCOW2_EXT_MAGIC_DATA_FILE 0x44415441
+#define QCOW2_EXT_MAGIC_ZONED_FORMAT 0x007a6264
static int coroutine_fn
qcow2_co_preadv_compressed(BlockDriverState *bs,
@@ -194,6 +195,74 @@ qcow2_extract_crypto_opts(QemuOpts *opts, const char *fmt,
Error **errp)
return cryptoopts_qdict;
}
+/*
+ * Passing by the zoned device configurations by a zoned_header struct, check
+ * if the zone device options are under constraints. Return false when some
+ * option is invalid
+ */
+static inline bool
+qcow2_check_zone_options(Qcow2ZonedHeaderExtension *zone_opt, Error **errp)
+{
+ if (zone_opt) {
+ uint32_t sequential_zones;
+
+ if (zone_opt->zone_size == 0) {
+ error_setg(errp, "Zoned extension header zone_size field "
+ "can not be 0");
+ return false;
+ }
+
+ if (zone_opt->zone_capacity > zone_opt->zone_size) {
+ error_setg(errp, "zone capacity %" PRIu64 "B exceeds zone size "
+ "%" PRIu64 "B", zone_opt->zone_capacity,
+ zone_opt->zone_size);
+ return false;
+ }
+
+ if (zone_opt->max_append_bytes + BDRV_SECTOR_SIZE >=
+ zone_opt->zone_capacity) {
+ error_setg(errp, "max append bytes %" PRIu64 "B exceeds zone "
+ "capacity %" PRIu32 "B by more than block size",
+ zone_opt->zone_capacity,
+ zone_opt->max_append_bytes);
+ return false;
+ }
+
+ if (zone_opt->conventional_zones >= zone_opt->nr_zones) {
+ error_setg(errp, "Conventional_zones %" PRIu32 " exceeds "
+ "nr_zones %" PRIu32 ".",
+ zone_opt->conventional_zones, zone_opt->nr_zones);
+ return false;
+ }
+
+ if (zone_opt->max_active_zones > zone_opt->nr_zones) {
+ error_setg(errp, "Max_active_zones %" PRIu32 " exceeds "
+ "nr_zones %" PRIu32 ". Set it to nr_zones.",
+ zone_opt->max_active_zones, zone_opt->nr_zones);
+ zone_opt->max_active_zones = zone_opt->nr_zones;
+ }
+
+ sequential_zones = zone_opt->nr_zones - zone_opt->conventional_zones;
+ if (zone_opt->max_open_zones > sequential_zones) {
+ error_setg(errp, "Max_open_zones field can not be larger than"
+ "the number of SWR zones. Set it to number of SWR"
+ "zones %" PRIu32 ".", sequential_zones);
+ zone_opt->max_open_zones = sequential_zones;
+ }
+ if (zone_opt->max_open_zones > zone_opt->max_active_zones) {
+ error_setg(errp, "Max_open_zones %" PRIu32 " exceeds "
+ "max_active_zones %" PRIu32 ". Set it to "
+ "max_active_zones.",
+ zone_opt->max_open_zones,
+ zone_opt->max_active_zones);
+ zone_opt->max_open_zones = zone_opt->max_active_zones;
+ }
+
+ return true;
+ }
+ return false;
+}
+
/*
* read qcow2 extension and fill bs
* start reading from start_offset
@@ -211,6 +280,7 @@ qcow2_read_extensions(BlockDriverState *bs, uint64_t
start_offset,
uint64_t offset;
int ret;
Qcow2BitmapHeaderExt bitmaps_ext;
+ Qcow2ZonedHeaderExtension zoned_ext;
if (need_update_header != NULL) {
*need_update_header = false;
@@ -432,6 +502,51 @@ qcow2_read_extensions(BlockDriverState *bs, uint64_t
start_offset,
break;
}
+ case QCOW2_EXT_MAGIC_ZONED_FORMAT:
+ {
+ if (ext.len < sizeof(zoned_ext)) {
+ /* Missing fields */
+ error_setg(errp, "zoned_ext: len=%" PRIu32 " too small "
+ "(<%zu)", ext.len, sizeof(zoned_ext));
+ return -EINVAL;
+ }
+ ret = bdrv_pread(bs->file, offset, ext.len, &zoned_ext, 0);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "zoned_ext: "
+ "Could not read ext header");
+ return ret;
+ }
+
+ zoned_ext.zone_size = be64_to_cpu(zoned_ext.zone_size);
+ zoned_ext.zone_capacity = be64_to_cpu(zoned_ext.zone_capacity);
+ zoned_ext.conventional_zones =
+ be32_to_cpu(zoned_ext.conventional_zones);
+ zoned_ext.nr_zones = be32_to_cpu(zoned_ext.nr_zones);
+ zoned_ext.max_open_zones = be32_to_cpu(zoned_ext.max_open_zones);
+ zoned_ext.max_active_zones =
+ be32_to_cpu(zoned_ext.max_active_zones);
+ zoned_ext.max_append_bytes =
+ be32_to_cpu(zoned_ext.max_append_bytes);
+ s->zoned_header = zoned_ext;
+
+ /* refuse to open broken images */
+ if (zoned_ext.nr_zones != DIV_ROUND_UP(bs->total_sectors *
+ BDRV_SECTOR_SIZE, zoned_ext.zone_size)) {
+ error_setg(errp, "Zoned extension header nr_zones field "
+ "is wrong");
+ return -EINVAL;
+ }
+ if (!qcow2_check_zone_options(&zoned_ext, errp)) {
+ return -EINVAL;
+ }
+
+#ifdef DEBUG_EXT
+ printf("Qcow2: Got zoned format extension: "
+ "offset=%" PRIu32 "\n", offset);
+#endif
+ break;
+ }
+
default:
/* unknown magic - save it in case we need to rewrite the header */
/* If you add a new feature, make sure to also update the fast
@@ -1982,6 +2097,15 @@ static void qcow2_refresh_limits(BlockDriverState *bs,
Error **errp)
}
bs->bl.pwrite_zeroes_alignment = s->subcluster_size;
bs->bl.pdiscard_alignment = s->cluster_size;
+ bs->bl.zoned = s->zoned_header.zoned;
+ bs->bl.nr_zones = s->zoned_header.nr_zones;
+ bs->bl.max_append_sectors = s->zoned_header.max_append_bytes
+ >> BDRV_SECTOR_BITS;
+ bs->bl.max_active_zones = s->zoned_header.max_active_zones;
+ bs->bl.max_open_zones = s->zoned_header.max_open_zones;
+ bs->bl.zone_size = s->zoned_header.zone_size;
+ bs->bl.zone_capacity = s->zoned_header.zone_capacity;
+ bs->bl.write_granularity = BDRV_SECTOR_SIZE;
}
static int GRAPH_UNLOCKED
@@ -3081,6 +3205,11 @@ int qcow2_update_header(BlockDriverState *bs)
.bit = QCOW2_INCOMPAT_EXTL2_BITNR,
.name = "extended L2 entries",
},
+ {
+ .type = QCOW2_FEAT_TYPE_INCOMPATIBLE,
+ .bit = QCOW2_INCOMPAT_ZONED_FORMAT_BITNR,
+ .name = "zoned format",
+ },
{
.type = QCOW2_FEAT_TYPE_COMPATIBLE,
.bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
@@ -3126,6 +3255,31 @@ int qcow2_update_header(BlockDriverState *bs)
buflen -= ret;
}
+ /* Zoned devices header extension */
+ if (s->zoned_header.zoned == BLK_Z_HM) {
+ Qcow2ZonedHeaderExtension zoned_header = {
+ .zoned = s->zoned_header.zoned,
+ .zone_size = cpu_to_be64(s->zoned_header.zone_size),
+ .zone_capacity = cpu_to_be64(s->zoned_header.zone_capacity),
+ .conventional_zones =
+ cpu_to_be32(s->zoned_header.conventional_zones),
+ .nr_zones = cpu_to_be32(s->zoned_header.nr_zones),
+ .max_open_zones = cpu_to_be32(s->zoned_header.max_open_zones),
+ .max_active_zones =
+ cpu_to_be32(s->zoned_header.max_active_zones),
+ .max_append_bytes =
+ cpu_to_be32(s->zoned_header.max_append_bytes)
+ };
+ ret = header_ext_add(buf, QCOW2_EXT_MAGIC_ZONED_FORMAT,
+ &zoned_header, sizeof(zoned_header),
+ buflen);
+ if (ret < 0) {
+ goto fail;
+ }
+ buf += ret;
+ buflen -= ret;
+ }
+
/* Keep unknown header extensions */
QLIST_FOREACH(uext, &s->unknown_header_ext, next) {
ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen);
@@ -3500,6 +3654,8 @@ qcow2_co_create(BlockdevCreateOptions *create_options,
Error **errp)
ERRP_GUARD();
BlockdevCreateOptionsQcow2 *qcow2_opts;
QDict *options;
+ Qcow2ZoneCreateOptions *zone_struct;
+ Qcow2ZoneHostManaged *zone_host_managed;
/*
* Open the image file and write a minimal qcow2 header.
@@ -3526,6 +3682,8 @@ qcow2_co_create(BlockdevCreateOptions *create_options,
Error **errp)
assert(create_options->driver == BLOCKDEV_DRIVER_QCOW2);
qcow2_opts = &create_options->u.qcow2;
+ zone_struct = create_options->u.qcow2.zone;
+ zone_host_managed = &create_options->u.qcow2.zone->u.host_managed;
bs = bdrv_co_open_blockdev_ref(qcow2_opts->file, errp);
if (bs == NULL) {
@@ -3739,6 +3897,14 @@ qcow2_co_create(BlockdevCreateOptions *create_options,
Error **errp)
header->incompatible_features |=
cpu_to_be64(QCOW2_INCOMPAT_DATA_FILE);
}
+ if (zone_struct && zone_struct->mode == QCOW2_ZONE_MODEL_HOST_MANAGED) {
+ /*
+ * The incompatible bit must be set when the zone model is
+ * host-managed
+ */
+ header->incompatible_features |=
+ cpu_to_be64(QCOW2_INCOMPAT_ZONED_FORMAT);
+ }
if (qcow2_opts->data_file_raw) {
header->autoclear_features |=
cpu_to_be64(QCOW2_AUTOCLEAR_DATA_FILE_RAW);
@@ -3796,10 +3962,9 @@ qcow2_co_create(BlockdevCreateOptions *create_options,
Error **errp)
bdrv_graph_co_rdlock();
ret = qcow2_alloc_clusters(blk_bs(blk), 3 * cluster_size);
if (ret < 0) {
- bdrv_graph_co_rdunlock();
error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 "
"header and refcount table");
- goto out;
+ goto unlock;
} else if (ret != 0) {
error_report("Huh, first cluster in empty image is already in use?");
@@ -3807,11 +3972,62 @@ qcow2_co_create(BlockdevCreateOptions *create_options,
Error **errp)
}
/* Set the external data file if necessary */
+ BDRVQcow2State *s = blk_bs(blk)->opaque;
if (data_bs) {
- BDRVQcow2State *s = blk_bs(blk)->opaque;
s->image_data_file = g_strdup(data_bs->filename);
}
+ if (zone_struct && zone_struct->mode == QCOW2_ZONE_MODEL_HOST_MANAGED) {
+ s->zoned_header.zoned = BLK_Z_HM;
+
+ if (!zone_host_managed->has_size) {
+ s->zoned_header.zone_size = DEFAULT_ZONE_SIZE;
+ } else {
+ s->zoned_header.zone_size = zone_host_managed->size;
+ }
+ s->zoned_header.nr_zones = DIV_ROUND_UP(qcow2_opts->size,
+ s->zoned_header.zone_size);
+
+ if (zone_host_managed->has_capacity) {
+ s->zoned_header.zone_capacity = zone_host_managed->capacity;
+ } else {
+ s->zoned_header.zone_capacity = s->zoned_header.zone_size;
+ }
+
+ if (zone_host_managed->has_conventional_zones) {
+ s->zoned_header.conventional_zones =
+ zone_host_managed->conventional_zones;
+ }
+
+ if (zone_host_managed->has_max_active_zones) {
+ s->zoned_header.max_active_zones =
+ zone_host_managed->max_active_zones;
+
+ if (zone_host_managed->has_max_open_zones) {
+ s->zoned_header.max_open_zones =
+ zone_host_managed->max_open_zones;
+ } else {
+ s->zoned_header.max_open_zones =
+ zone_host_managed->max_active_zones;
+ }
+ }
+
+ if (zone_host_managed->has_max_append_bytes) {
+ s->zoned_header.max_append_bytes =
+ zone_host_managed->max_append_bytes;
+ } else {
+ s->zoned_header.max_append_bytes = DEFAULT_MAX_APPEND_BYTES;
+ }
+
+ if (!qcow2_check_zone_options(&s->zoned_header, errp)) {
+ s->zoned_header.zoned = BLK_Z_NONE;
+ ret = -EINVAL;
+ goto unlock;
+ }
+ } else {
+ s->zoned_header.zoned = BLK_Z_NONE;
+ }
+
/* Create a full header (including things like feature table) */
ret = qcow2_update_header(blk_bs(blk));
bdrv_graph_co_rdunlock();
@@ -3885,6 +4101,9 @@ qcow2_co_create(BlockdevCreateOptions *create_options,
Error **errp)
}
ret = 0;
+ goto out;
+unlock:
+ bdrv_graph_co_rdunlock();
out:
blk_co_unref(blk);
bdrv_co_unref(bs);
@@ -3945,6 +4164,10 @@ qcow2_co_create_opts(BlockDriver *drv, const char
*filename, QemuOpts *opts,
{ BLOCK_OPT_COMPAT_LEVEL, "version" },
{ BLOCK_OPT_DATA_FILE_RAW, "data-file-raw" },
{ BLOCK_OPT_COMPRESSION_TYPE, "compression-type" },
+ { BLOCK_OPT_CONVENTIONAL_ZONES, "zone.conventional-zones" },
+ { BLOCK_OPT_MAX_OPEN_ZONES, "zone.max-open-zones" },
+ { BLOCK_OPT_MAX_ACTIVE_ZONES, "zone.max-active-zones" },
+ { BLOCK_OPT_MAX_APPEND_BYTES, "zone.max-append-bytes" },
{ NULL, NULL },
};
@@ -6113,6 +6336,41 @@ static QemuOptsList qcow2_create_opts = {
.help = "Compression method used for image cluster " \
"compression", \
.def_value_str = "zlib" \
+ }, \
+ { \
+ .name = BLOCK_OPT_ZONE_MODEL, \
+ .type = QEMU_OPT_STRING, \
+ .help = "zone model modes, mode choice: host-managed", \
+ }, \
+ { \
+ .name = BLOCK_OPT_ZONE_SIZE, \
+ .type = QEMU_OPT_SIZE, \
+ .help = "zone size", \
+ }, \
+ { \
+ .name = BLOCK_OPT_ZONE_CAPACITY, \
+ .type = QEMU_OPT_SIZE, \
+ .help = "zone capacity", \
+ }, \
+ { \
+ .name = BLOCK_OPT_CONVENTIONAL_ZONES, \
+ .type = QEMU_OPT_NUMBER, \
+ .help = "numbers of conventional zones", \
+ }, \
+ { \
+ .name = BLOCK_OPT_MAX_APPEND_BYTES, \
+ .type = QEMU_OPT_SIZE, \
+ .help = "max append bytes", \
+ }, \
+ { \
+ .name = BLOCK_OPT_MAX_ACTIVE_ZONES, \
+ .type = QEMU_OPT_NUMBER, \
+ .help = "max active zones", \
+ }, \
+ { \
+ .name = BLOCK_OPT_MAX_OPEN_ZONES, \
+ .type = QEMU_OPT_NUMBER, \
+ .help = "max open zones", \
},
QCOW_COMMON_OPTIONS,
{ /* end of list */ }
diff --git a/block/qcow2.h b/block/qcow2.h
index a9e3481c6e..cc9bff0473 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -128,6 +128,9 @@
#define DEFAULT_CLUSTER_SIZE 65536
+#define DEFAULT_ZONE_SIZE (256 * MiB)
+#define DEFAULT_MAX_APPEND_BYTES (64 * KiB)
+
#define QCOW2_OPT_DATA_FILE "data-file"
#define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
@@ -236,6 +239,27 @@ typedef struct Qcow2CryptoHeaderExtension {
uint64_t length;
} QEMU_PACKED Qcow2CryptoHeaderExtension;
+typedef struct Qcow2ZonedHeaderExtension {
+ /* Zoned device attributes */
+ uint8_t zoned;
+ uint8_t reserved[3];
+ uint64_t zone_size;
+ uint64_t zone_capacity;
+ uint32_t conventional_zones;
+ uint32_t nr_zones;
+ uint32_t max_active_zones;
+ uint32_t max_open_zones;
+ uint32_t max_append_bytes;
+ uint64_t zonedmeta_size;
+ uint64_t zonedmeta_offset;
+} QEMU_PACKED Qcow2ZonedHeaderExtension;
+
+typedef struct Qcow2ZoneListEntry {
+ QLIST_ENTRY(Qcow2ZoneListEntry) exp_open_zone_entry;
+ QLIST_ENTRY(Qcow2ZoneListEntry) imp_open_zone_entry;
+ QLIST_ENTRY(Qcow2ZoneListEntry) closed_zone_entry;
+} Qcow2ZoneListEntry;
+
typedef struct Qcow2UnknownHeaderExtension {
uint32_t magic;
uint32_t len;
@@ -256,17 +280,20 @@ enum {
QCOW2_INCOMPAT_DATA_FILE_BITNR = 2,
QCOW2_INCOMPAT_COMPRESSION_BITNR = 3,
QCOW2_INCOMPAT_EXTL2_BITNR = 4,
+ QCOW2_INCOMPAT_ZONED_FORMAT_BITNR = 5,
QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
QCOW2_INCOMPAT_CORRUPT = 1 << QCOW2_INCOMPAT_CORRUPT_BITNR,
QCOW2_INCOMPAT_DATA_FILE = 1 << QCOW2_INCOMPAT_DATA_FILE_BITNR,
QCOW2_INCOMPAT_COMPRESSION = 1 << QCOW2_INCOMPAT_COMPRESSION_BITNR,
QCOW2_INCOMPAT_EXTL2 = 1 << QCOW2_INCOMPAT_EXTL2_BITNR,
+ QCOW2_INCOMPAT_ZONED_FORMAT = 1 << QCOW2_INCOMPAT_ZONED_FORMAT_BITNR,
QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY
| QCOW2_INCOMPAT_CORRUPT
| QCOW2_INCOMPAT_DATA_FILE
| QCOW2_INCOMPAT_COMPRESSION
- | QCOW2_INCOMPAT_EXTL2,
+ | QCOW2_INCOMPAT_EXTL2
+ | QCOW2_INCOMPAT_ZONED_FORMAT,
};
/* Compatible feature bits */
@@ -422,6 +449,9 @@ typedef struct BDRVQcow2State {
* is to convert the image with the desired compression type set.
*/
Qcow2CompressionType compression_type;
+
+ /* States of zoned device */
+ Qcow2ZonedHeaderExtension zoned_header;
} BDRVQcow2State;
typedef struct Qcow2COWRegion {
diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt
index 2c4618375a..18834a9a7c 100644
--- a/docs/interop/qcow2.txt
+++ b/docs/interop/qcow2.txt
@@ -125,7 +125,26 @@ the next fields through header_length.
allows subcluster-based allocation. See the
Extended L2 Entries section for more details.
- Bits 5-63: Reserved (set to 0)
+ Bit 5: Zoned extension bit. If this bit is set then
+ the file is an emulated zoned device. The
+ zoned extension must be present.
+ Implementations that do not support zoned
+ emulation cannot open this file because it
+ generally only make sense to interpret the
+ data along with the zone information and
+ write pointers.
+
+ It is unsafe when any qcow2 user without
+ knowing the zoned extension reads or edits
+ a file with the zoned extension. The write
+ pointer tracking can be corrupted when a
+ writer edits a file, like overwriting beyond
+ the write pointer locations. Or a reader tries
+ to access a file without knowing write
+ pointers where the software setup will cause
+ invalid reads.
+
+ Bits 6-63: Reserved (set to 0)
80 - 87: compatible_features
Bitmask of compatible features. An implementation can
@@ -249,6 +268,7 @@ be stored. Each extension has a structure like the
following:
0x23852875 - Bitmaps extension
0x0537be77 - Full disk encryption header pointer
0x44415441 - External data file name string
+ 0x007a6264 - Zoned extension
other - Unknown header extension, can be safely
ignored
@@ -331,6 +351,91 @@ The fields of the bitmaps extension are:
Offset into the image file at which the bitmap directory
starts. Must be aligned to a cluster boundary.
+== Zoned extension ==
+
+The zoned extension must be present if the incompatible bit is set, and
+omitted when the incompatible bit is clear. It contains fields for
+emulating the zoned storage model (https://zonedstorage.io/). When the
+zone model mode is not host-managed, it is regarded as incompatible
+and reports an error to users.
+
+The write pointers for each zone are stored in an area called zonedmeta
+clusters. It is 8 bytes per zone. The offset and size of the zonedmeta
+are kept in the zoned extension header.
+
+The fields of the zoned extension are:
+ Byte 0: zoned
+ The byte represents the zoned model of the device. 0 is for
+ a non-zoned device (all other information in this header
+ is ignored). 1 is for a host-managed device, which only
+ allows for sequential writes within each zone. Other
+ values may be added later, the implementation must refuse
+ to open a device containing an unknown zone model.
+
+ 1 - 3: Reserved, must be zero.
+
+ 4 - 11: zone_size
+ Total size of each zone, in bytes. The 64-bit field is to
+ satisfy the virtio-blk zone_size range and emulate a read
+ zoned device, whose maximum zone size can be as large as
+ 2TB.
+
+ The value must be power of 2. Linux currently requires
+ the zone size to be a power of 2 number of LBAs. Qcow2
+ following this is mainly to allow emulating a real
+ ZNS drive configuration. It is not relevant to the cluster
+ size.
+
+ 12 - 19: zone_capacity
+ The number of writable bytes within the zones. The bytes
+ between zone capacity and zone size are unusable: reads
+ will return 0s and writes will fail.
+
+ A zone capacity is always smaller or equal to the zone
+ size. It is for emulating a real ZNS drive configuration,
+ which has the constraint of aligning to some hardware erase
+ block size.
+
+ 20 - 23: conventional_zones
+ The number of conventional zones. The conventional zones
+ allow sequential writes and random writes. While the
+ sequential zones only allow sequential writes.
+
+ 24 - 27: nr_zones
+ The number of zones. It is the sum of conventional zones
+ and sequential zones. The maximum value for nr_zones is
+ (2^32 - 1)/8 = 536870911.
+
+ 28 - 31: max_active_zones
+ The number of the zones that can be in the implicit open,
+ explicit open or closed state. The max active zones cannot
+ be larger than the max open zones.
+
+ 32 - 35: max_open_zones
+ The maximal number of open (implicitly open or explicitly
+ open) zones. It cannot be larger than the number of SWR
+ zones of the device.
+
+ If the limits of open zones or active zones are equal to
+ the total number of SWR zones, then it's the same as having
+ no limits therefore max open zones and max active zones are
+ set to 0.
+
+ 36 - 39: max_append_bytes
+ The number of bytes of a zone append request that can be
+ issued to the device. It must be 512-byte aligned and less
+ than the zone capacity.
+
+ 40 - 47: zonedmeta_size
+ The size of zoned metadata in bytes. It contains no more
+ than 4GB. The zoned metadata structure is the write
+ pointers for each zone whose size is the number of zones
+ multiplied by the zone size.
+
+ 48 - 55: zonedmeta_offset
+ The offset of zoned metadata structure in the contained
+ image, in bytes.
+
== Full disk encryption header pointer ==
The full disk encryption header must be present if, and only if, the
diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h
index ebb4e56a50..e1001ad9a3 100644
--- a/include/block/block_int-common.h
+++ b/include/block/block_int-common.h
@@ -57,6 +57,13 @@
#define BLOCK_OPT_DATA_FILE_RAW "data_file_raw"
#define BLOCK_OPT_COMPRESSION_TYPE "compression_type"
#define BLOCK_OPT_EXTL2 "extended_l2"
+#define BLOCK_OPT_ZONE_MODEL "zone.mode"
+#define BLOCK_OPT_ZONE_SIZE "zone.size"
+#define BLOCK_OPT_ZONE_CAPACITY "zone.capacity"
+#define BLOCK_OPT_CONVENTIONAL_ZONES "zone.conventional_zones"
+#define BLOCK_OPT_MAX_APPEND_BYTES "zone.max_append_bytes"
+#define BLOCK_OPT_MAX_ACTIVE_ZONES "zone.max_active_zones"
+#define BLOCK_OPT_MAX_OPEN_ZONES "zone.max_open_zones"
#define BLOCK_PROBE_BUF_SIZE 512
@@ -881,7 +888,13 @@ typedef struct BlockLimits {
BlockZoneModel zoned;
/* zone size expressed in bytes */
- uint32_t zone_size;
+ uint64_t zone_size;
+
+ /*
+ * The number of usable logical blocks within the zone, expressed
+ * in bytes. A zone capacity is smaller or equal to the zone size.
+ */
+ uint64_t zone_capacity;
/* total number of zones */
uint32_t nr_zones;
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 9f6dd59298..43500da1bb 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -5073,6 +5073,69 @@
{ 'enum': 'Qcow2CompressionType',
'data': [ 'zlib', { 'name': 'zstd', 'if': 'CONFIG_ZSTD' } ] }
+##
+# @Qcow2ZoneModel:
+#
+# Zoned device model used in qcow2 image file
+#
+# @host-managed: The host-managed model only allows sequential write over the
+# device zones.
+#
+# Since 8.2
+##
+{ 'enum': 'Qcow2ZoneModel',
+ 'data': [ 'host-managed'] }
+
+##
+# @Qcow2ZoneHostManaged:
+#
+# The host-managed zone model. It only allows sequential writes.
+#
+# @size: Total number of bytes within zones (default 256 MB).
+#
+# @capacity: The number of usable logical blocks within zones
+# in bytes. A zone capacity is always smaller or equal to the
+# zone size (default to zone size).
+#
+# @conventional-zones: The number of conventional zones of the
+# zoned device (default 0).
+#
+# @max-open-zones: The maximal number of open zones. It is less than
+# or equal to the number of sequential write required zones of
+# the device (default 0).
+#
+# @max-active-zones: The maximal number of zones in the implicit
+# open, explicit open or closed state. It is less than or equal
+# to the max open zones (default 0).
+#
+# @max-append-bytes: The maximal number of bytes of a zone
+# append request that can be issued to the device. It must be
+# 512-byte aligned and less than the zone capacity (default 64 KB).
+#
+# Since 8.2
+##
+{ 'struct': 'Qcow2ZoneHostManaged',
+ 'data': { '*size': 'size',
+ '*capacity': 'size',
+ '*conventional-zones': 'uint32',
+ '*max-open-zones': 'uint32',
+ '*max-active-zones': 'uint32',
+ '*max-append-bytes': 'size' } }
+
+##
+# @Qcow2ZoneCreateOptions:
+#
+# The zone device model for the qcow2 image.
+#
+# @mode: The zone device model modes.
+#
+# Since 8.2
+##
+{ 'union': 'Qcow2ZoneCreateOptions',
+ 'base': { 'mode': 'Qcow2ZoneModel' },
+ 'discriminator': 'mode',
+ 'data': { 'host-managed': 'Qcow2ZoneHostManaged' } }
+
##
# @BlockdevCreateOptionsQcow2:
#
@@ -5115,6 +5178,9 @@
# @compression-type: The image cluster compression method
# (default: zlib, since 5.1)
#
+# @zone: The zone device model modes. The default is that the device is
+# not zoned. (since 8.2)
+#
# Since: 2.12
##
{ 'struct': 'BlockdevCreateOptionsQcow2',
@@ -5131,7 +5197,8 @@
'*preallocation': 'PreallocMode',
'*lazy-refcounts': 'bool',
'*refcount-bits': 'int',
- '*compression-type':'Qcow2CompressionType' } }
+ '*compression-type':'Qcow2CompressionType',
+ '*zone': 'Qcow2ZoneCreateOptions' } }
##
# @BlockdevCreateOptionsQed:
--
2.34.1
