Introduce two new helper functions handle_alloc() and
vmdk_alloc_cluster_offset(). handle_alloc() helps to allocate multiple
clusters at once starting from a given offset on disk and performs COW
if necessary for first and last allocated clusters.
vmdk_alloc_cluster_offset() helps to return the offset of the first of
the many newly allocated clusters. Also, provide proper documentation
for both.
Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
---
block/vmdk.c | 192 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 182 insertions(+), 10 deletions(-)
diff --git a/block/vmdk.c b/block/vmdk.c
index fe2046b..b671dc9 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -136,6 +136,7 @@ typedef struct VmdkMetaData {
unsigned int l2_offset;
int valid;
uint32_t *l2_cache_entry;
+ uint32_t nb_clusters;
} VmdkMetaData;
typedef struct VmdkGrainMarker {
@@ -1242,6 +1243,174 @@ static int get_cluster_table(VmdkExtent *extent, uint64_t offset,
return VMDK_OK;
}
+/*
+ * vmdk_handle_alloc
+ *
+ * Allocate new clusters for an area that either is yet unallocated or needs a
+ * copy on write. If *cluster_offset is non_zero, clusters are only allocated if
+ * the new allocation can match the specified host offset.
+ *
+ * Returns:
+ * VMDK_OK: if new clusters were allocated, *bytes may be decreased if
+ * the new allocation doesn't cover all of the requested area.
+ * *cluster_offset is updated to contain the offset of the
+ * first newly allocated cluster.
+ *
+ * VMDK_UNALLOC: if no clusters could be allocated. *cluster_offset is left
+ * unchanged.
+ *
+ * VMDK_ERROR: in error cases
+ */
+static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
+ uint64_t offset, uint64_t *cluster_offset,
+ int64_t *bytes, VmdkMetaData *m_data,
+ bool allocate, uint32_t *alloc_clusters_counter)
+{
+ int l1_index, l2_offset, l2_index;
+ uint32_t *l2_table;
+ uint32_t cluster_sector;
+ uint32_t nb_clusters;
+ bool zeroed = false;
+ uint64_t skip_start_bytes, skip_end_bytes;
+ int ret;
+
+ ret = get_cluster_table(extent, offset, &l1_index, &l2_offset,
+ &l2_index, &l2_table);
+ if (ret < 0) {
+ return ret;
+ }
+
+ cluster_sector = le32_to_cpu(l2_table[l2_index]);
+
+ skip_start_bytes = vmdk_find_offset_in_cluster(extent, offset);
+ /* Calculate the number of clusters to look for. Here we truncate the last
+ * cluster, i.e. 1 less than the actual value calculated as we may need to
+ * perform COW for the last one. */
+ nb_clusters = DIV_ROUND_UP(skip_start_bytes + *bytes,
+ extent->cluster_sectors << BDRV_SECTOR_BITS) - 1;
+
+ nb_clusters = MIN(nb_clusters, extent->l2_size - l2_index);
+ assert(nb_clusters <= INT_MAX);
+
+ /* update bytes according to final nb_clusters value */
+ if (nb_clusters != 0) {
+ *bytes = ((nb_clusters * extent->cluster_sectors) << BDRV_SECTOR_BITS)
+ - skip_start_bytes;
+ } else {
+ nb_clusters = 1;
+ }
+ *alloc_clusters_counter += nb_clusters;
+ skip_end_bytes = skip_start_bytes + MIN(*bytes,
+ extent->cluster_sectors * BDRV_SECTOR_SIZE
+ - skip_start_bytes);
+
+ if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
+ zeroed = true;
+ }
+
+ if (!cluster_sector || zeroed) {
+ if (!allocate) {
+ return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
+ }
+
+ cluster_sector = extent->next_cluster_sector;
+ extent->next_cluster_sector += extent->cluster_sectors
+ * nb_clusters;
+
+ ret = vmdk_perform_cow(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
+ offset, skip_start_bytes,
+ skip_end_bytes);
+ if (ret < 0) {
+ return ret;
+ }
+ if (m_data) {
+ m_data->valid = 1;
+ m_data->l1_index = l1_index;
+ m_data->l2_index = l2_index;
+ m_data->l2_offset = l2_offset;
+ m_data->l2_cache_entry = &l2_table[l2_index];
+ m_data->nb_clusters = nb_clusters;
+ }
+ }
+ *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
+ return VMDK_OK;
+}
+
+/*
+ * vmdk_alloc_clusters
+ *
+ * For a given offset on the virtual disk, find the cluster offset in vmdk
+ * file. If the offset is not found, allocate a new cluster.
+ *
+ * If the cluster is newly allocated, m_data->nb_clusters is set to the number
+ * of contiguous clusters that have been allocated. In this case, the other
+ * fields of m_data are valid and contain information about the first allocated
+ * cluster.
+ *
+ * Returns:
+ *
+ * VMDK_OK: on success and @cluster_offset was set
+ *
+ * VMDK_UNALLOC: if no clusters were allocated and @cluster_offset is
+ * set to zero
+ *
+ * VMDK_ERROR: in error cases
+ */
+static int vmdk_alloc_clusters(BlockDriverState *bs,
+ VmdkExtent *extent,
+ VmdkMetaData *m_data, uint64_t offset,
+ bool allocate, uint64_t *cluster_offset,
+ int64_t bytes,
+ uint32_t *total_alloc_clusters)
+{
+ uint64_t start, remaining;
+ uint64_t new_cluster_offset;
+ int64_t n_bytes;
+ int ret;
+
+ if (extent->flat) {
+ *cluster_offset = extent->flat_start_offset;
+ return VMDK_OK;
+ }
+
+ start = offset;
+ remaining = bytes;
+ new_cluster_offset = 0;
+ *cluster_offset = 0;
+ n_bytes = 0;
+ if (m_data) {
+ m_data->valid = 0;
+ }
+
+ /* due to L2 table margins all bytes may not get allocated at once */
+ while (true) {
+
+ if (!*cluster_offset) {
+ *cluster_offset = new_cluster_offset;
+ }
+
+ start += n_bytes;
+ remaining -= n_bytes;
+ new_cluster_offset += n_bytes;
+
+ if (remaining == 0) {
+ break;
+ }
+
+ n_bytes = remaining;
+
+ ret = vmdk_handle_alloc(bs, extent, start, &new_cluster_offset, &n_bytes,
+ m_data, allocate, total_alloc_clusters);
+
+ if (ret < 0) {
+ return ret;
+
+ }
+ }
+
+ return VMDK_OK;
+}
+
/**
* vmdk_get_cluster_offset
*
@@ -1625,6 +1794,7 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
uint64_t bytes_done = 0;
VmdkMetaData m_data;
uint64_t extent_end;
+ uint32_t total_alloc_clusters = 0;
if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
error_report("Wrong offset: offset=0x%" PRIx64
@@ -1650,10 +1820,10 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
n_bytes = MIN(bytes, extent_end - offset);
}
- ret = vmdk_get_cluster_offset(bs, extent, &m_data, offset,
- !(extent->compressed || zeroed),
- &cluster_offset, offset_in_cluster,
- offset_in_cluster + n_bytes);
+ ret = vmdk_alloc_clusters(bs, extent, &m_data, offset,
+ !(extent->compressed || zeroed),
+ &cluster_offset, n_bytes,
+ &total_alloc_clusters);
if (extent->compressed) {
if (ret == VMDK_OK) {
/* Refuse write to allocated cluster for streamOptimized */
@@ -1662,8 +1832,9 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
return -EIO;
} else {
/* allocate */
- ret = vmdk_get_cluster_offset(bs, extent, &m_data, offset,
- true, &cluster_offset, 0, 0);
+ ret = vmdk_alloc_clusters(bs, extent, &m_data, offset,
+ true, &cluster_offset, n_bytes,
+ &total_alloc_clusters);
}
}
if (ret == VMDK_ERROR) {
@@ -1671,10 +1842,11 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
}
if (zeroed) {
/* Do zeroed write, buf is ignored */
- if (extent->has_zero_grain &&
- offset_in_cluster == 0 &&
- n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
- n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
+ if (extent->has_zero_grain && offset_in_cluster == 0 &&
+ n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE *
+ total_alloc_clusters) {
+ n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE *
+ total_alloc_clusters;
if (!zero_dry_run) {
/* update L2 tables */
if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
--
2.6.2
On Mon, 06/05 13:22, Ashijeet Acharya wrote:
> +/*
> + * vmdk_handle_alloc
> + *
> + * Allocate new clusters for an area that either is yet unallocated or needs a
> + * copy on write. If *cluster_offset is non_zero, clusters are only allocated if
> + * the new allocation can match the specified host offset.
I don't think this matches the function body, the passed in *cluster_offset
value is ignored.
> + *
> + * Returns:
> + * VMDK_OK: if new clusters were allocated, *bytes may be decreased if
> + * the new allocation doesn't cover all of the requested area.
> + * *cluster_offset is updated to contain the offset of the
> + * first newly allocated cluster.
> + *
> + * VMDK_UNALLOC: if no clusters could be allocated. *cluster_offset is left
> + * unchanged.
> + *
> + * VMDK_ERROR: in error cases
> + */
> +static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
> + uint64_t offset, uint64_t *cluster_offset,
> + int64_t *bytes, VmdkMetaData *m_data,
> + bool allocate, uint32_t *alloc_clusters_counter)
> +{
> + int l1_index, l2_offset, l2_index;
> + uint32_t *l2_table;
> + uint32_t cluster_sector;
> + uint32_t nb_clusters;
> + bool zeroed = false;
> + uint64_t skip_start_bytes, skip_end_bytes;
> + int ret;
> +
> + ret = get_cluster_table(extent, offset, &l1_index, &l2_offset,
> + &l2_index, &l2_table);
> + if (ret < 0) {
> + return ret;
> + }
> +
> + cluster_sector = le32_to_cpu(l2_table[l2_index]);
> +
> + skip_start_bytes = vmdk_find_offset_in_cluster(extent, offset);
> + /* Calculate the number of clusters to look for. Here we truncate the last
> + * cluster, i.e. 1 less than the actual value calculated as we may need to
> + * perform COW for the last one. */
> + nb_clusters = DIV_ROUND_UP(skip_start_bytes + *bytes,
> + extent->cluster_sectors << BDRV_SECTOR_BITS) - 1;
> +
> + nb_clusters = MIN(nb_clusters, extent->l2_size - l2_index);
> + assert(nb_clusters <= INT_MAX);
> +
> + /* update bytes according to final nb_clusters value */
> + if (nb_clusters != 0) {
> + *bytes = ((nb_clusters * extent->cluster_sectors) << BDRV_SECTOR_BITS)
> + - skip_start_bytes;
> + } else {
> + nb_clusters = 1;
> + }
> + *alloc_clusters_counter += nb_clusters;
> + skip_end_bytes = skip_start_bytes + MIN(*bytes,
> + extent->cluster_sectors * BDRV_SECTOR_SIZE
> + - skip_start_bytes);
I don't understand the MIN part, shouldn't skip_end_bytes simply be
skip_start_bytes + *bytes?
> +
> + if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
> + zeroed = true;
> + }
> +
> + if (!cluster_sector || zeroed) {
> + if (!allocate) {
> + return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
> + }
> +
> + cluster_sector = extent->next_cluster_sector;
> + extent->next_cluster_sector += extent->cluster_sectors
> + * nb_clusters;
> +
> + ret = vmdk_perform_cow(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
> + offset, skip_start_bytes,
> + skip_end_bytes);
> + if (ret < 0) {
> + return ret;
> + }
> + if (m_data) {
> + m_data->valid = 1;
> + m_data->l1_index = l1_index;
> + m_data->l2_index = l2_index;
> + m_data->l2_offset = l2_offset;
> + m_data->l2_cache_entry = &l2_table[l2_index];
> + m_data->nb_clusters = nb_clusters;
> + }
> + }
> + *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
> + return VMDK_OK;
> +}
> +
> +/*
> + * vmdk_alloc_clusters
> + *
> + * For a given offset on the virtual disk, find the cluster offset in vmdk
> + * file. If the offset is not found, allocate a new cluster.
> + *
> + * If the cluster is newly allocated, m_data->nb_clusters is set to the number
> + * of contiguous clusters that have been allocated. In this case, the other
> + * fields of m_data are valid and contain information about the first allocated
> + * cluster.
> + *
> + * Returns:
> + *
> + * VMDK_OK: on success and @cluster_offset was set
> + *
> + * VMDK_UNALLOC: if no clusters were allocated and @cluster_offset is
> + * set to zero
> + *
> + * VMDK_ERROR: in error cases
> + */
> +static int vmdk_alloc_clusters(BlockDriverState *bs,
> + VmdkExtent *extent,
> + VmdkMetaData *m_data, uint64_t offset,
> + bool allocate, uint64_t *cluster_offset,
> + int64_t bytes,
> + uint32_t *total_alloc_clusters)
> +{
> + uint64_t start, remaining;
> + uint64_t new_cluster_offset;
> + int64_t n_bytes;
> + int ret;
> +
> + if (extent->flat) {
> + *cluster_offset = extent->flat_start_offset;
> + return VMDK_OK;
> + }
> +
> + start = offset;
> + remaining = bytes;
> + new_cluster_offset = 0;
> + *cluster_offset = 0;
> + n_bytes = 0;
> + if (m_data) {
> + m_data->valid = 0;
> + }
> +
> + /* due to L2 table margins all bytes may not get allocated at once */
> + while (true) {
> +
> + if (!*cluster_offset) {
> + *cluster_offset = new_cluster_offset;
> + }
> +
> + start += n_bytes;
> + remaining -= n_bytes;
> + new_cluster_offset += n_bytes;
Like said above, even though you increment new_cluster_offset by n_bytes, it has
no effect inside vmdk_handle_alloc. Is this intended?
> +
> + if (remaining == 0) {
> + break;
> + }
> +
> + n_bytes = remaining;
> +
> + ret = vmdk_handle_alloc(bs, extent, start, &new_cluster_offset, &n_bytes,
> + m_data, allocate, total_alloc_clusters);
> +
> + if (ret < 0) {
> + return ret;
> +
> + }
> + }
> +
> + return VMDK_OK;
> +}
> +
> /**
> * vmdk_get_cluster_offset
> *
> @@ -1625,6 +1794,7 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
> uint64_t bytes_done = 0;
> VmdkMetaData m_data;
> uint64_t extent_end;
> + uint32_t total_alloc_clusters = 0;
>
> if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
> error_report("Wrong offset: offset=0x%" PRIx64
> @@ -1650,10 +1820,10 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
> n_bytes = MIN(bytes, extent_end - offset);
> }
>
> - ret = vmdk_get_cluster_offset(bs, extent, &m_data, offset,
> - !(extent->compressed || zeroed),
> - &cluster_offset, offset_in_cluster,
> - offset_in_cluster + n_bytes);
> + ret = vmdk_alloc_clusters(bs, extent, &m_data, offset,
> + !(extent->compressed || zeroed),
> + &cluster_offset, n_bytes,
> + &total_alloc_clusters);
> if (extent->compressed) {
> if (ret == VMDK_OK) {
> /* Refuse write to allocated cluster for streamOptimized */
> @@ -1662,8 +1832,9 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
> return -EIO;
> } else {
> /* allocate */
> - ret = vmdk_get_cluster_offset(bs, extent, &m_data, offset,
> - true, &cluster_offset, 0, 0);
> + ret = vmdk_alloc_clusters(bs, extent, &m_data, offset,
> + true, &cluster_offset, n_bytes,
> + &total_alloc_clusters);
> }
> }
> if (ret == VMDK_ERROR) {
> @@ -1671,10 +1842,11 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
> }
> if (zeroed) {
> /* Do zeroed write, buf is ignored */
> - if (extent->has_zero_grain &&
> - offset_in_cluster == 0 &&
> - n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) {
> - n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE;
> + if (extent->has_zero_grain && offset_in_cluster == 0 &&
> + n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE *
> + total_alloc_clusters) {
> + n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE *
> + total_alloc_clusters;
> if (!zero_dry_run) {
> /* update L2 tables */
> if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
> --
> 2.6.2
>
Fam
On Tue, Jun 27, 2017 at 1:32 PM, Fam Zheng <famz@redhat.com> wrote:
> On Mon, 06/05 13:22, Ashijeet Acharya wrote:
>> +/*
>> + * vmdk_handle_alloc
>> + *
>> + * Allocate new clusters for an area that either is yet unallocated or needs a
>> + * copy on write. If *cluster_offset is non_zero, clusters are only allocated if
>> + * the new allocation can match the specified host offset.
>
> I don't think this matches the function body, the passed in *cluster_offset
> value is ignored.
>
>> + *
>> + * Returns:
>> + * VMDK_OK: if new clusters were allocated, *bytes may be decreased if
>> + * the new allocation doesn't cover all of the requested area.
>> + * *cluster_offset is updated to contain the offset of the
>> + * first newly allocated cluster.
>> + *
>> + * VMDK_UNALLOC: if no clusters could be allocated. *cluster_offset is left
>> + * unchanged.
>> + *
>> + * VMDK_ERROR: in error cases
>> + */
>> +static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
>> + uint64_t offset, uint64_t *cluster_offset,
>> + int64_t *bytes, VmdkMetaData *m_data,
>> + bool allocate, uint32_t *alloc_clusters_counter)
>> +{
>> + int l1_index, l2_offset, l2_index;
>> + uint32_t *l2_table;
>> + uint32_t cluster_sector;
>> + uint32_t nb_clusters;
>> + bool zeroed = false;
>> + uint64_t skip_start_bytes, skip_end_bytes;
>> + int ret;
>> +
>> + ret = get_cluster_table(extent, offset, &l1_index, &l2_offset,
>> + &l2_index, &l2_table);
>> + if (ret < 0) {
>> + return ret;
>> + }
>> +
>> + cluster_sector = le32_to_cpu(l2_table[l2_index]);
>> +
>> + skip_start_bytes = vmdk_find_offset_in_cluster(extent, offset);
>> + /* Calculate the number of clusters to look for. Here we truncate the last
>> + * cluster, i.e. 1 less than the actual value calculated as we may need to
>> + * perform COW for the last one. */
>> + nb_clusters = DIV_ROUND_UP(skip_start_bytes + *bytes,
>> + extent->cluster_sectors << BDRV_SECTOR_BITS) - 1;
>> +
>> + nb_clusters = MIN(nb_clusters, extent->l2_size - l2_index);
>> + assert(nb_clusters <= INT_MAX);
>> +
>> + /* update bytes according to final nb_clusters value */
>> + if (nb_clusters != 0) {
>> + *bytes = ((nb_clusters * extent->cluster_sectors) << BDRV_SECTOR_BITS)
>> + - skip_start_bytes;
>> + } else {
>> + nb_clusters = 1;
>> + }
>> + *alloc_clusters_counter += nb_clusters;
>> + skip_end_bytes = skip_start_bytes + MIN(*bytes,
>> + extent->cluster_sectors * BDRV_SECTOR_SIZE
>> + - skip_start_bytes);
>
> I don't understand the MIN part, shouldn't skip_end_bytes simply be
> skip_start_bytes + *bytes?
>
>> +
>> + if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) {
>> + zeroed = true;
>> + }
>> +
>> + if (!cluster_sector || zeroed) {
>> + if (!allocate) {
>> + return zeroed ? VMDK_ZEROED : VMDK_UNALLOC;
>> + }
>> +
>> + cluster_sector = extent->next_cluster_sector;
>> + extent->next_cluster_sector += extent->cluster_sectors
>> + * nb_clusters;
>> +
>> + ret = vmdk_perform_cow(bs, extent, cluster_sector * BDRV_SECTOR_SIZE,
>> + offset, skip_start_bytes,
>> + skip_end_bytes);
>> + if (ret < 0) {
>> + return ret;
>> + }
>> + if (m_data) {
>> + m_data->valid = 1;
>> + m_data->l1_index = l1_index;
>> + m_data->l2_index = l2_index;
>> + m_data->l2_offset = l2_offset;
>> + m_data->l2_cache_entry = &l2_table[l2_index];
>> + m_data->nb_clusters = nb_clusters;
>> + }
>> + }
>> + *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
>> + return VMDK_OK;
>> +}
>> +
>> +/*
>> + * vmdk_alloc_clusters
>> + *
>> + * For a given offset on the virtual disk, find the cluster offset in vmdk
>> + * file. If the offset is not found, allocate a new cluster.
>> + *
>> + * If the cluster is newly allocated, m_data->nb_clusters is set to the number
>> + * of contiguous clusters that have been allocated. In this case, the other
>> + * fields of m_data are valid and contain information about the first allocated
>> + * cluster.
>> + *
>> + * Returns:
>> + *
>> + * VMDK_OK: on success and @cluster_offset was set
>> + *
>> + * VMDK_UNALLOC: if no clusters were allocated and @cluster_offset is
>> + * set to zero
>> + *
>> + * VMDK_ERROR: in error cases
>> + */
>> +static int vmdk_alloc_clusters(BlockDriverState *bs,
>> + VmdkExtent *extent,
>> + VmdkMetaData *m_data, uint64_t offset,
>> + bool allocate, uint64_t *cluster_offset,
>> + int64_t bytes,
>> + uint32_t *total_alloc_clusters)
>> +{
>> + uint64_t start, remaining;
>> + uint64_t new_cluster_offset;
>> + int64_t n_bytes;
>> + int ret;
>> +
>> + if (extent->flat) {
>> + *cluster_offset = extent->flat_start_offset;
>> + return VMDK_OK;
>> + }
>> +
>> + start = offset;
>> + remaining = bytes;
>> + new_cluster_offset = 0;
>> + *cluster_offset = 0;
>> + n_bytes = 0;
>> + if (m_data) {
>> + m_data->valid = 0;
>> + }
>> +
>> + /* due to L2 table margins all bytes may not get allocated at once */
>> + while (true) {
>> +
>> + if (!*cluster_offset) {
>> + *cluster_offset = new_cluster_offset;
>> + }
>> +
>> + start += n_bytes;
>> + remaining -= n_bytes;
>> + new_cluster_offset += n_bytes;
>
> Like said above, even though you increment new_cluster_offset by n_bytes, it has
> no effect inside vmdk_handle_alloc. Is this intended?
I think that comment may have caused a confusion as it was valid only
till v2/v3 and not now. I will remove it.
Ashijeet
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