By adding zone operations and zoned metadata, the zoned emulation
capability enables full emulation support of zoned device using
a qcow2 file. The zoned device metadata includes zone type,
zoned device state and write pointer of each zone, which is stored
to an array of unsigned integers.
Each zone of a zoned device makes state transitions following
the zone state machine. The zone state machine mainly describes
five states, IMPLICIT OPEN, EXPLICIT OPEN, FULL, EMPTY and CLOSED.
READ ONLY and OFFLINE states will generally be affected by device
internal events. The operations on zones cause corresponding state
changing.
Zoned devices have a limit on zone resources, which puts constraints on
write operations into zones.
Signed-off-by: Sam Li <faithilikerun@gmail.com>
---
block/qcow2.c | 657 ++++++++++++++++++++++++++++++++++++++++-
block/qcow2.h | 2 +
block/trace-events | 1 +
docs/interop/qcow2.txt | 6 +
4 files changed, 664 insertions(+), 2 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index 7074bfc620..bc98d98c8e 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -194,6 +194,153 @@ qcow2_extract_crypto_opts(QemuOpts *opts, const char *fmt, Error **errp)
return cryptoopts_qdict;
}
+#define QCOW2_ZT_IS_CONV(wp) (wp & 1ULL << 59)
+
+static inline int qcow2_get_wp(uint64_t wp)
+{
+ /* clear state and type information */
+ return ((wp << 5) >> 5);
+}
+
+static inline int qcow2_get_zs(uint64_t wp)
+{
+ return (wp >> 60);
+}
+
+static inline void qcow2_set_zs(uint64_t *wp, BlockZoneState zs)
+{
+ uint64_t addr = qcow2_get_wp(*wp);
+ addr |= ((uint64_t)zs << 60);
+ *wp = addr;
+}
+
+/*
+ * Perform a state assignment and a flush operation that writes the new wp
+ * value to the dedicated location of the disk file.
+ */
+static int qcow2_write_wp_at(BlockDriverState *bs, uint64_t *wp,
+ uint32_t index, BlockZoneState zs) {
+ BDRVQcow2State *s = bs->opaque;
+ uint64_t wpv = *wp;
+ int ret;
+
+ qcow2_set_zs(wp, zs);
+ ret = bdrv_pwrite(bs->file, s->zoned_header.zonedmeta_offset
+ + sizeof(uint64_t) * index, sizeof(uint64_t), wp, 0);
+
+ if (ret < 0) {
+ goto exit;
+ }
+ trace_qcow2_wp_tracking(index, qcow2_get_wp(*wp) >> BDRV_SECTOR_BITS);
+ return ret;
+
+exit:
+ *wp = wpv;
+ error_report("Failed to write metadata with file");
+ return ret;
+}
+
+static bool qcow2_check_active_zones(BlockDriverState *bs)
+{
+ BDRVQcow2State *s = bs->opaque;
+
+ if (!s->zoned_header.max_active_zones) {
+ return true;
+ }
+
+ if (s->nr_zones_exp_open + s->nr_zones_imp_open + s->nr_zones_closed
+ < s->zoned_header.max_active_zones) {
+ return true;
+ }
+
+ return false;
+}
+
+static int qcow2_check_open_zones(BlockDriverState *bs)
+{
+ BDRVQcow2State *s = bs->opaque;
+ int ret;
+
+ if (!s->zoned_header.max_open_zones) {
+ return 0;
+ }
+
+ if (s->nr_zones_exp_open + s->nr_zones_imp_open
+ < s->zoned_header.max_open_zones) {
+ return 0;
+ }
+
+ if(s->nr_zones_imp_open && qcow2_check_active_zones(bs)) {
+ /* TODO: it takes O(n) time complexity (n = nr_zones).
+ * Optimizations required. */
+ /* close one implicitly open zones to make it available */
+ for (int i = s->zoned_header.nr_conv_zones;
+ i < bs->bl.nr_zones; ++i) {
+ uint64_t *wp = &bs->wps->wp[i];
+ if (qcow2_get_zs(*wp) == BLK_ZS_IOPEN) {
+ ret = qcow2_write_wp_at(bs, wp, i, BLK_ZS_CLOSED);
+ if (ret < 0) {
+ return ret;
+ }
+ bs->wps->wp[i] = *wp;
+ s->nr_zones_imp_open--;
+ s->nr_zones_closed++;
+ break;
+ }
+ }
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * The zoned device has limited zone resources of open, closed, active
+ * zones.
+ */
+static int qcow2_check_zone_resources(BlockDriverState *bs,
+ BlockZoneState zs)
+{
+ int ret = 0;
+
+ switch (zs) {
+ case BLK_ZS_EMPTY:
+ if (!qcow2_check_active_zones(bs)) {
+ error_report("No enough active zones");
+ return -EINVAL;
+ }
+ return ret;
+ case BLK_ZS_CLOSED:
+ ret = qcow2_check_open_zones(bs);
+ if (ret < 0) {
+ error_report("No enough open zones");
+ return ret;
+ }
+ return ret;
+ default:
+ return -EINVAL;
+ }
+
+}
+
+static inline int qcow2_refresh_zonedmeta(BlockDriverState *bs)
+{
+ int ret;
+ BDRVQcow2State *s = bs->opaque;
+ uint64_t wps_size = s->zoned_header.zonedmeta_size;
+ g_autofree uint64_t *temp = NULL;
+ temp = g_new(uint64_t, wps_size);
+ ret = bdrv_pread(bs->file, s->zoned_header.zonedmeta_offset,
+ wps_size, temp, 0);
+ if (ret < 0) {
+ error_report("Can not read metadata");
+ return ret;
+ }
+
+ memcpy(s->wps->wp, temp, wps_size);
+ return 0;
+}
+
/*
* read qcow2 extension and fill bs
* start reading from start_offset
@@ -455,7 +602,19 @@ qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
be32_to_cpu(zoned_ext.max_active_zones);
zoned_ext.max_append_sectors =
be32_to_cpu(zoned_ext.max_append_sectors);
+ zoned_ext.zonedmeta_offset =
+ be64_to_cpu(zoned_ext.zonedmeta_offset);
+ zoned_ext.zonedmeta_size = be64_to_cpu(zoned_ext.zonedmeta_size);
s->zoned_header = zoned_ext;
+ s->wps = g_malloc(sizeof(BlockZoneWps)
+ + s->zoned_header.zonedmeta_size);
+ ret = qcow2_refresh_zonedmeta(bs);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "zonedmeta: "
+ "Could not update zoned meta");
+ return ret;
+ }
+ qemu_co_mutex_init(&s->wps->colock);
/* refuse to open broken images */
if (zoned_ext.zone_size == 0) {
@@ -2716,9 +2875,26 @@ qcow2_co_pwritev_part(BlockDriverState *bs, int64_t offset, int64_t bytes,
uint64_t host_offset;
QCowL2Meta *l2meta = NULL;
AioTaskPool *aio = NULL;
+ int64_t start_offset, start_bytes;
+ BlockZoneState zs;
+ int64_t end;
+ uint64_t *wp;
+ int64_t zone_size = bs->bl.zone_size;
+ int index;
trace_qcow2_writev_start_req(qemu_coroutine_self(), offset, bytes);
+ start_offset = offset;
+ start_bytes = bytes;
+ /* The offset should not less than the wp of that
+ * zone where offset starts. */
+ if (zone_size) {
+ index = start_offset / zone_size;
+ wp = &bs->wps->wp[index];
+ if (offset < qcow2_get_wp(*wp)) {
+ return -EINVAL;
+ }
+ }
while (bytes != 0 && aio_task_pool_status(aio) == 0) {
l2meta = NULL;
@@ -2764,6 +2940,47 @@ qcow2_co_pwritev_part(BlockDriverState *bs, int64_t offset, int64_t bytes,
qiov_offset += cur_bytes;
trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_bytes);
}
+
+ if (zone_size) {
+ index = start_offset / zone_size;
+ wp = &bs->wps->wp[index];
+ uint64_t wpv = *wp;
+ if (!QCOW2_ZT_IS_CONV(wpv)) {
+ /*
+ * Implicitly open one closed zone to write if there are zone resources
+ * left.
+ */
+ zs = qcow2_get_zs(wpv);
+ if (zs == BLK_ZS_CLOSED || zs == BLK_ZS_EMPTY) {
+ ret = qcow2_check_zone_resources(bs, zs);
+ if (ret < 0) {
+ goto fail_nometa;
+ }
+
+ if (zs == BLK_ZS_CLOSED) {
+ s->nr_zones_closed--;
+ s->nr_zones_imp_open++;
+ } else {
+ s->nr_zones_imp_open++;
+ }
+ }
+
+ /* align up (start_offset, zone_size), the start offset is not
+ * necessarily power of two. */
+ end = ((start_offset + zone_size) / zone_size) * zone_size;
+ if (start_offset + start_bytes <= end) {
+ *wp = start_offset + start_bytes;
+ } else {
+ ret = -EINVAL;
+ goto fail_nometa;
+ }
+
+ ret = qcow2_write_wp_at(bs, wp, index,BLK_ZS_IOPEN);
+ if (ret < 0) {
+ goto fail_nometa;
+ }
+ }
+ }
ret = 0;
qemu_co_mutex_lock(&s->lock);
@@ -3160,7 +3377,9 @@ int qcow2_update_header(BlockDriverState *bs)
.max_active_zones =
cpu_to_be32(s->zoned_header.max_active_zones),
.max_append_sectors =
- cpu_to_be32(s->zoned_header.max_append_sectors)
+ cpu_to_be32(s->zoned_header.max_append_sectors),
+ .zonedmeta_offset = cpu_to_be64(s->zoned_header.zonedmeta_offset),
+ .zonedmeta_size = cpu_to_be64(s->zoned_header.zonedmeta_size)
};
ret = header_ext_add(buf, QCOW2_EXT_MAGIC_ZONED_FORMAT,
&zoned_header, sizeof(zoned_header),
@@ -3565,7 +3784,8 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp)
int version;
int refcount_order;
uint64_t *refcount_table;
- int ret;
+ uint64_t zoned_meta_size, zoned_clusterlen;
+ int ret, offset, i;
uint8_t compression_type = QCOW2_COMPRESSION_TYPE_ZLIB;
assert(create_options->driver == BLOCKDEV_DRIVER_QCOW2);
@@ -3901,6 +4121,49 @@ qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp)
}
}
s->zoned_header.max_append_sectors = qcow2_opts->max_append_sectors;
+
+ uint32_t nrz = s->zoned_header.nr_zones;
+ zoned_meta_size = sizeof(uint64_t) * nrz;
+ g_autofree uint64_t *meta = NULL;
+ meta = g_new0(uint64_t, nrz);
+
+ for (i = 0; i < s->zoned_header.nr_conv_zones; ++i) {
+ meta[i] = i * s->zoned_header.zone_size;
+ meta[i] |= 1ULL << 59;
+ }
+
+ for (; i < nrz; ++i) {
+ meta[i] = i * s->zoned_header.zone_size;
+ /* For sequential zones, the first four most significant bit
+ * indicates zone states. */
+ meta[i] |= ((uint64_t)BLK_ZS_EMPTY << 60);
+ }
+
+ offset = qcow2_alloc_clusters(blk_bs(blk), zoned_meta_size);
+ if (offset < 0) {
+ error_setg_errno(errp, -offset, "Could not allocate clusters "
+ "for zoned metadata size");
+ goto out;
+ }
+ s->zoned_header.zonedmeta_offset = offset;
+ s->zoned_header.zonedmeta_size = zoned_meta_size;
+
+ zoned_clusterlen = size_to_clusters(s, zoned_meta_size)
+ * s->cluster_size;
+ assert(qcow2_pre_write_overlap_check(bs, 0, offset,
+ zoned_clusterlen,false) == 0);
+ ret = bdrv_pwrite_zeroes(blk_bs(blk)->file, offset,
+ zoned_clusterlen, 0);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Could not zero fill zoned metadata");
+ goto out;
+ }
+ ret = bdrv_pwrite(blk_bs(blk)->file, offset, zoned_meta_size, meta, 0);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "Could not write zoned metadata "
+ "to disk");
+ goto out;
+ }
} else {
s->zoned_header.zoned = BLK_Z_NONE;
}
@@ -4239,6 +4502,392 @@ static coroutine_fn int qcow2_co_pdiscard(BlockDriverState *bs,
return ret;
}
+static int coroutine_fn
+qcow2_co_zone_report(BlockDriverState *bs, int64_t offset,
+ unsigned int *nr_zones, BlockZoneDescriptor *zones)
+{
+ BDRVQcow2State *s = bs->opaque;
+ uint64_t zone_size = s->zoned_header.zone_size;
+ int64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS;
+ int64_t size = bs->bl.nr_zones * zone_size;
+ unsigned int nrz = *nr_zones;
+ int i = 0;
+ int si;
+
+ if (offset >= capacity) {
+ error_report("offset %" PRId64 " is equal to or greater than the"
+ "device capacity %" PRId64 "", offset, capacity);
+ return -EINVAL;
+ }
+
+ if (nrz > bs->bl.nr_zones) {
+ error_report("nr_zones %" PRId32 " should not exceed the device zones"
+ "%" PRId32 "", nrz, bs->bl.nr_zones);
+ return -EINVAL;
+ }
+
+ if (zone_size > 0) {
+ si = offset / zone_size;
+ qemu_co_mutex_lock(&bs->wps->colock);
+ for (; i < nrz; ++i) {
+ if (i + si >= bs->bl.nr_zones) {
+ break;
+ }
+
+ zones[i].start = (si + i) * zone_size;
+
+ /* The last zone can be smaller than the zone size */
+ if ((si + i + 1) == bs->bl.nr_zones && size > capacity) {
+ uint32_t l = zone_size - (size - capacity);
+ zones[i].length = l;
+ zones[i].cap = l;
+ } else {
+ zones[i].length = zone_size;
+ zones[i].cap = zone_size;
+ }
+
+ uint64_t wp = bs->wps->wp[si + i];
+ if (QCOW2_ZT_IS_CONV(wp)) {
+ zones[i].type = BLK_ZT_CONV;
+ zones[i].state = BLK_ZS_NOT_WP;
+ /* Clear the zone type bit */
+ wp &= ~(1ULL << 59);
+ } else {
+ zones[i].type = BLK_ZT_SWR;
+ zones[i].state = qcow2_get_zs(wp);
+ /* Clear the zone state bits */
+ wp = qcow2_get_wp(wp);
+ }
+ zones[i].wp = wp;
+ }
+ qemu_co_mutex_unlock(&bs->wps->colock);
+ }
+ *nr_zones = i;
+ return 0;
+}
+
+static int qcow2_open_zone(BlockDriverState *bs, uint32_t index) {
+ BDRVQcow2State *s = bs->opaque;
+ int ret;
+
+ qemu_co_mutex_lock(&bs->wps->colock);
+ uint64_t *wp = &bs->wps->wp[index];
+ BlockZoneState zs = qcow2_get_zs(*wp);
+
+ switch(zs) {
+ case BLK_ZS_EMPTY:
+ ret = qcow2_check_zone_resources(bs, BLK_ZS_EMPTY);
+ if (ret < 0) {
+ goto unlock;
+ }
+ break;
+ case BLK_ZS_IOPEN:
+ s->nr_zones_imp_open--;
+ break;
+ case BLK_ZS_EOPEN:
+ return 0;
+ case BLK_ZS_CLOSED:
+ ret = qcow2_check_zone_resources(bs, BLK_ZS_CLOSED);
+ if (ret < 0) {
+ goto unlock;
+ }
+ s->nr_zones_closed--;
+ break;
+ case BLK_ZS_FULL:
+ break;
+ default:
+ ret = -EINVAL;
+ goto unlock;
+ }
+ ret = qcow2_write_wp_at(bs, wp, index, BLK_ZS_EOPEN);
+ if (!ret) {
+ s->nr_zones_exp_open++;
+ }
+
+unlock:
+ qemu_co_mutex_unlock(&bs->wps->colock);
+ return ret;
+}
+
+static int qcow2_close_zone(BlockDriverState *bs, uint32_t index) {
+ BDRVQcow2State *s = bs->opaque;
+ int ret;
+
+ qemu_co_mutex_lock(&bs->wps->colock);
+ uint64_t *wp = &bs->wps->wp[index];
+ BlockZoneState zs = qcow2_get_zs(*wp);
+
+ switch(zs) {
+ case BLK_ZS_EMPTY:
+ break;
+ case BLK_ZS_IOPEN:
+ s->nr_zones_imp_open--;
+ break;
+ case BLK_ZS_EOPEN:
+ s->nr_zones_exp_open--;
+ break;
+ case BLK_ZS_CLOSED:
+ ret = qcow2_check_zone_resources(bs, BLK_ZS_CLOSED);
+ if (ret < 0) {
+ goto unlock;
+ }
+ s->nr_zones_closed--;
+ break;
+ case BLK_ZS_FULL:
+ break;
+ default:
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ if (zs == BLK_ZS_EMPTY) {
+ ret = qcow2_write_wp_at(bs, wp, index, BLK_ZS_EMPTY);
+ } else {
+ ret = qcow2_write_wp_at(bs, wp, index, BLK_ZS_CLOSED);
+ if (!ret) {
+ s->nr_zones_closed++;
+ }
+ }
+
+unlock:
+ qemu_co_mutex_unlock(&bs->wps->colock);
+ return ret;
+}
+
+static int qcow2_finish_zone(BlockDriverState *bs, uint32_t index) {
+ BDRVQcow2State *s = bs->opaque;
+ int ret;
+
+ qemu_co_mutex_lock(&bs->wps->colock);
+ uint64_t *wp = &bs->wps->wp[index];
+ BlockZoneState zs = qcow2_get_zs(*wp);
+
+ switch(zs) {
+ case BLK_ZS_EMPTY:
+ ret = qcow2_check_zone_resources(bs, BLK_ZS_EMPTY);
+ if (ret < 0) {
+ goto unlock;
+ }
+ break;
+ case BLK_ZS_IOPEN:
+ s->nr_zones_imp_open--;
+ break;
+ case BLK_ZS_EOPEN:
+ s->nr_zones_exp_open--;
+ break;
+ case BLK_ZS_CLOSED:
+ ret = qcow2_check_zone_resources(bs, BLK_ZS_CLOSED);
+ if (ret < 0) {
+ goto unlock;
+ }
+ s->nr_zones_closed--;
+ break;
+ case BLK_ZS_FULL:
+ ret = 0;
+ goto unlock;
+ default:
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ *wp = ((uint64_t)index + 1) * s->zoned_header.zone_size;
+ ret = qcow2_write_wp_at(bs, wp, index, BLK_ZS_FULL);
+
+unlock:
+ qemu_co_mutex_unlock(&bs->wps->colock);
+ return ret;
+}
+
+static int qcow2_reset_zone(BlockDriverState *bs, uint32_t index,
+ int64_t len) {
+ BDRVQcow2State *s = bs->opaque;
+ int nrz = bs->bl.nr_zones;
+ int zone_size = bs->bl.zone_size;
+ int n, ret = 0;
+
+ qemu_co_mutex_lock(&bs->wps->colock);
+ uint64_t *wp = &bs->wps->wp[index];
+ if (len == bs->total_sectors << BDRV_SECTOR_BITS) {
+ n = nrz;
+ index = 0;
+ } else {
+ n = len / zone_size;
+ }
+
+ for (int i = 0; i < n; ++i) {
+ uint64_t *wp_i = (uint64_t *)(wp + i);
+ uint64_t wpi_v = *wp_i;
+ if (QCOW2_ZT_IS_CONV(wpi_v)) {
+ continue;
+ }
+
+ BlockZoneState zs = qcow2_get_zs(wpi_v);
+ switch (zs) {
+ case BLK_ZS_EMPTY:
+ break;
+ case BLK_ZS_IOPEN:
+ s->nr_zones_imp_open--;
+ break;
+ case BLK_ZS_EOPEN:
+ s->nr_zones_exp_open--;
+ break;
+ case BLK_ZS_CLOSED:
+ s->nr_zones_closed--;
+ break;
+ case BLK_ZS_FULL:
+ break;
+ default:
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ if (zs == BLK_ZS_EMPTY) {
+ continue;
+ }
+
+ *wp_i = ((uint64_t)index + i) * zone_size;
+ ret = qcow2_write_wp_at(bs, wp_i, index + i, BLK_ZS_EMPTY);
+ if (ret < 0) {
+ goto unlock;
+ }
+ /* clear data */
+ ret = qcow2_co_pwrite_zeroes(bs, qcow2_get_wp(*wp_i), zone_size, 0);
+ if (ret < 0) {
+ error_report("Failed to reset zone at 0x%" PRIx64 "", *wp_i);
+ }
+ }
+
+unlock:
+ qemu_co_mutex_unlock(&bs->wps->colock);
+ return ret;
+}
+
+static int coroutine_fn qcow2_co_zone_mgmt(BlockDriverState *bs, BlockZoneOp op,
+ int64_t offset, int64_t len)
+{
+ BDRVQcow2State *s = bs->opaque;
+ int ret = 0;
+ int64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS;
+ int64_t zone_size = s->zoned_header.zone_size;
+ int64_t zone_size_mask = zone_size - 1;
+ uint32_t index = offset / zone_size;
+ BlockZoneWps *wps = bs->wps;
+
+ if (offset >= capacity) {
+ error_report("offset %" PRId64 " is equal to or greater than the"
+ "device capacity %" PRId64 "", offset, capacity);
+ return -EINVAL;
+ }
+
+ if (offset & zone_size_mask) {
+ error_report("sector offset %" PRId64 " is not aligned to zone size"
+ " %" PRId64 "", offset / 512, zone_size / 512);
+ return -EINVAL;
+ }
+
+ if (((offset + len) < capacity && len & zone_size_mask) ||
+ offset + len > capacity) {
+ error_report("number of sectors %" PRId64 " is not aligned to zone"
+ " size %" PRId64 "", len / 512, zone_size / 512);
+ return -EINVAL;
+ }
+
+ qemu_co_mutex_lock(&wps->colock);
+ uint64_t wpv = wps->wp[index];
+ if (QCOW2_ZT_IS_CONV(wpv) && len != capacity) {
+ error_report("zone mgmt operations are not allowed for "
+ "conventional zones");
+ ret = -EIO;
+ goto unlock;
+ }
+ qemu_co_mutex_unlock(&wps->colock);
+
+ switch(op) {
+ case BLK_ZO_OPEN:
+ ret = qcow2_open_zone(bs, index);
+ break;
+ case BLK_ZO_CLOSE:
+ ret = qcow2_close_zone(bs, index);
+ break;
+ case BLK_ZO_FINISH:
+ ret = qcow2_finish_zone(bs, index);
+ break;
+ case BLK_ZO_RESET:
+ ret = qcow2_reset_zone(bs, index, len);
+ break;
+ default:
+ error_report("Unsupported zone op: 0x%x", op);
+ ret = -ENOTSUP;
+ break;
+ }
+ return ret;
+
+unlock:
+ qemu_co_mutex_unlock(&wps->colock);
+ return ret;
+}
+
+static int coroutine_fn
+qcow2_co_zone_append(BlockDriverState *bs, int64_t *offset, QEMUIOVector *qiov,
+ BdrvRequestFlags flags)
+{
+ assert(flags == 0);
+ int64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS;
+ uint32_t index;
+ int ret;
+ int64_t zone_size_mask = bs->bl.zone_size - 1;
+ int64_t iov_len = 0;
+ int64_t len = 0;
+
+ if (*offset >= capacity) {
+ error_report("*offset %" PRId64 " is equal to or greater than the"
+ "device capacity %" PRId64 "", *offset, capacity);
+ return -EINVAL;
+ }
+
+ /* offset + len should not pass the end of that zone starting from offset */
+ if (*offset & zone_size_mask) {
+ error_report("sector offset %" PRId64 " is not aligned to zone size "
+ "%" PRId32 "", *offset / 512, bs->bl.zone_size / 512);
+ return -EINVAL;
+ }
+
+ int64_t wg = bs->bl.write_granularity;
+ int64_t wg_mask = wg - 1;
+ for (int i = 0; i < qiov->niov; i++) {
+ iov_len = qiov->iov[i].iov_len;
+ if (iov_len & wg_mask) {
+ error_report("len of IOVector[%d] %" PRId64 " is not aligned to "
+ "block size %" PRId64 "", i, iov_len, wg);
+ return -EINVAL;
+ }
+ }
+ len = qiov->size;
+ index = *offset / bs->bl.zone_size;
+
+ if ((len >> BDRV_SECTOR_BITS) > bs->bl.max_append_sectors) {
+ return -ENOTSUP;
+ }
+
+ qemu_co_mutex_lock(&bs->wps->colock);
+ uint64_t wp = bs->wps->wp[index];
+ uint64_t wp_i = qcow2_get_wp(wp);
+ ret = qcow2_co_pwritev_part(bs, wp_i, len, qiov, 0, 0);
+ if (ret == 0) {
+ *offset = wp_i;
+ /* the zone state is set to full when the wp reaches the end */
+ uint64_t wp_final = bs->wps->wp[index];
+ if (!(qcow2_get_wp(wp_final) & zone_size_mask)) {
+ ret = qcow2_write_wp_at(bs, &wp_final, index, BLK_ZS_FULL);
+ }
+ } else {
+ error_report("qcow2: zap failed");
+ }
+
+ qemu_co_mutex_unlock(&bs->wps->colock);
+ return ret;
+}
+
static int coroutine_fn GRAPH_RDLOCK
qcow2_co_copy_range_from(BlockDriverState *bs,
BdrvChild *src, int64_t src_offset,
@@ -6287,6 +6936,10 @@ BlockDriver bdrv_qcow2 = {
.bdrv_co_pwritev_part = qcow2_co_pwritev_part,
.bdrv_co_flush_to_os = qcow2_co_flush_to_os,
+ .bdrv_co_zone_report = qcow2_co_zone_report,
+ .bdrv_co_zone_mgmt = qcow2_co_zone_mgmt,
+ .bdrv_co_zone_append = qcow2_co_zone_append,
+
.bdrv_co_pwrite_zeroes = qcow2_co_pwrite_zeroes,
.bdrv_co_pdiscard = qcow2_co_pdiscard,
.bdrv_co_copy_range_from = qcow2_co_copy_range_from,
diff --git a/block/qcow2.h b/block/qcow2.h
index edb8eebcb3..b1930ddbd2 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -247,6 +247,8 @@ typedef struct Qcow2ZonedHeaderExtension {
uint32_t max_active_zones;
uint32_t max_open_zones;
uint32_t max_append_sectors;
+ uint64_t zonedmeta_offset;
+ uint64_t zonedmeta_size;
} QEMU_PACKED Qcow2ZonedHeaderExtension;
typedef struct Qcow2UnknownHeaderExtension {
diff --git a/block/trace-events b/block/trace-events
index 6f121b7636..06af0c79fb 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -82,6 +82,7 @@ qcow2_writev_data(void *co, uint64_t offset) "co %p offset 0x%" PRIx64
qcow2_pwrite_zeroes_start_req(void *co, int64_t offset, int64_t bytes) "co %p offset 0x%" PRIx64 " bytes %" PRId64
qcow2_pwrite_zeroes(void *co, int64_t offset, int64_t bytes) "co %p offset 0x%" PRIx64 " bytes %" PRId64
qcow2_skip_cow(void *co, uint64_t offset, int nb_clusters) "co %p offset 0x%" PRIx64 " nb_clusters %d"
+qcow2_wp_tracking(int index, uint64_t wp) "wps[%d]: 0x%" PRIx64
# qcow2-cluster.c
qcow2_alloc_clusters_offset(void *co, uint64_t offset, int bytes) "co %p offset 0x%" PRIx64 " bytes %d"
diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt
index 80ff03a826..e4002b443c 100644
--- a/docs/interop/qcow2.txt
+++ b/docs/interop/qcow2.txt
@@ -367,6 +367,12 @@ The fields of the zoned extension are:
The maximal data size in sectors of a zone
append request that can be issued to the device.
+ 36 - 43: zonedmeta_offset
+ The offset of zoned metadata structure in the file in bytes.
+
+ 44 - 51: zonedmeta_size
+ The size of zoned metadata in bytes.
+
== Full disk encryption header pointer ==
The full disk encryption header must be present if, and only if, the
--
2.40.1On Mon, Aug 28, 2023 at 11:09:54PM +0800, Sam Li wrote:
> By adding zone operations and zoned metadata, the zoned emulation
> capability enables full emulation support of zoned device using
> a qcow2 file. The zoned device metadata includes zone type,
> zoned device state and write pointer of each zone, which is stored
> to an array of unsigned integers.
>
> Each zone of a zoned device makes state transitions following
> the zone state machine. The zone state machine mainly describes
> five states, IMPLICIT OPEN, EXPLICIT OPEN, FULL, EMPTY and CLOSED.
> READ ONLY and OFFLINE states will generally be affected by device
> internal events. The operations on zones cause corresponding state
> changing.
>
> Zoned devices have a limit on zone resources, which puts constraints on
> write operations into zones.
>
> Signed-off-by: Sam Li <faithilikerun@gmail.com>
> ---
> block/qcow2.c | 657 ++++++++++++++++++++++++++++++++++++++++-
> block/qcow2.h | 2 +
> block/trace-events | 1 +
> docs/interop/qcow2.txt | 6 +
> 4 files changed, 664 insertions(+), 2 deletions(-)
>
> diff --git a/block/qcow2.c b/block/qcow2.c
> index 7074bfc620..bc98d98c8e 100644
> --- a/block/qcow2.c
> +++ b/block/qcow2.c
> @@ -194,6 +194,153 @@ qcow2_extract_crypto_opts(QemuOpts *opts, const char *fmt, Error **errp)
> return cryptoopts_qdict;
> }
>
> +#define QCOW2_ZT_IS_CONV(wp) (wp & 1ULL << 59)
> +
> +static inline int qcow2_get_wp(uint64_t wp)
> +{
> + /* clear state and type information */
> + return ((wp << 5) >> 5);
> +}
> +
> +static inline int qcow2_get_zs(uint64_t wp)
> +{
> + return (wp >> 60);
> +}
> +
> +static inline void qcow2_set_zs(uint64_t *wp, BlockZoneState zs)
> +{
> + uint64_t addr = qcow2_get_wp(*wp);
> + addr |= ((uint64_t)zs << 60);
> + *wp = addr;
> +}
> +
> +/*
> + * Perform a state assignment and a flush operation that writes the new wp
> + * value to the dedicated location of the disk file.
> + */
> +static int qcow2_write_wp_at(BlockDriverState *bs, uint64_t *wp,
> + uint32_t index, BlockZoneState zs) {
> + BDRVQcow2State *s = bs->opaque;
> + uint64_t wpv = *wp;
> + int ret;
> +
> + qcow2_set_zs(wp, zs);
> + ret = bdrv_pwrite(bs->file, s->zoned_header.zonedmeta_offset
> + + sizeof(uint64_t) * index, sizeof(uint64_t), wp, 0);
> +
> + if (ret < 0) {
> + goto exit;
> + }
> + trace_qcow2_wp_tracking(index, qcow2_get_wp(*wp) >> BDRV_SECTOR_BITS);
> + return ret;
> +
> +exit:
> + *wp = wpv;
> + error_report("Failed to write metadata with file");
> + return ret;
> +}
> +
> +static bool qcow2_check_active_zones(BlockDriverState *bs)
> +{
> + BDRVQcow2State *s = bs->opaque;
> +
> + if (!s->zoned_header.max_active_zones) {
> + return true;
> + }
> +
> + if (s->nr_zones_exp_open + s->nr_zones_imp_open + s->nr_zones_closed
> + < s->zoned_header.max_active_zones) {
> + return true;
> + }
> +
> + return false;
> +}
> +
> +static int qcow2_check_open_zones(BlockDriverState *bs)
> +{
> + BDRVQcow2State *s = bs->opaque;
> + int ret;
> +
> + if (!s->zoned_header.max_open_zones) {
> + return 0;
> + }
> +
> + if (s->nr_zones_exp_open + s->nr_zones_imp_open
> + < s->zoned_header.max_open_zones) {
> + return 0;
> + }
> +
> + if(s->nr_zones_imp_open && qcow2_check_active_zones(bs)) {
> + /* TODO: it takes O(n) time complexity (n = nr_zones).
> + * Optimizations required. */
> + /* close one implicitly open zones to make it available */
> + for (int i = s->zoned_header.nr_conv_zones;
Please use uint32_t to keep the types consistent.
> + i < bs->bl.nr_zones; ++i) {
> + uint64_t *wp = &bs->wps->wp[i];
> + if (qcow2_get_zs(*wp) == BLK_ZS_IOPEN) {
> + ret = qcow2_write_wp_at(bs, wp, i, BLK_ZS_CLOSED);
> + if (ret < 0) {
> + return ret;
> + }
> + bs->wps->wp[i] = *wp;
This assignment is unnecessary since wp points to bs->wps->wp[i]. The
value has already been updated.
> + s->nr_zones_imp_open--;
> + s->nr_zones_closed++;
> + break;
> + }
> + }
> + return 0;
If this for loop completes with i == bs->bl.nr_zones then we've failed
to close an IOPEN zone. The return value should be an error like -EBUSY.
> + }
> +
> + return -EINVAL;
Which case does this -EINVAL cover? Won't we get here when no zones are
open yet?
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