Include a next pointer in VmdkMetaData struct to point to the previous
allocated L2 table. Modify vmdk_L2update to start updating metadata for
allocation of multiple clusters at once.
Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
---
block/vmdk.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 101 insertions(+), 27 deletions(-)
diff --git a/block/vmdk.c b/block/vmdk.c
index b671dc9..9fa2414 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -137,6 +137,8 @@ typedef struct VmdkMetaData {
int valid;
uint32_t *l2_cache_entry;
uint32_t nb_clusters;
+ uint32_t offset;
+ struct VmdkMetaData *next;
} VmdkMetaData;
typedef struct VmdkGrainMarker {
@@ -1116,34 +1118,87 @@ exit:
return ret;
}
-static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
- uint32_t offset)
+static int vmdk_alloc_cluster_link_l2(VmdkExtent *extent,
+ VmdkMetaData *m_data, bool zeroed)
{
- offset = cpu_to_le32(offset);
+ int i;
+ uint32_t offset, temp_offset;
+ int *l2_table_array;
+ int l2_array_size;
+
+ if (zeroed) {
+ temp_offset = VMDK_GTE_ZEROED;
+ } else {
+ temp_offset = m_data->offset;
+ }
+
+ l2_array_size = sizeof(uint32_t) * m_data->nb_clusters;
+ l2_table_array = qemu_try_blockalign(extent->file->bs,
+ QEMU_ALIGN_UP(l2_array_size,
+ BDRV_SECTOR_SIZE));
+ if (l2_table_array == NULL) {
+ return VMDK_ERROR;
+ }
+ memset(l2_table_array, 0, QEMU_ALIGN_UP(l2_array_size, BDRV_SECTOR_SIZE));
/* update L2 table */
+ offset = temp_offset;
+ for (i = 0; i < m_data->nb_clusters; i++) {
+ l2_table_array[i] = cpu_to_le32(offset);
+ if (!zeroed) {
+ offset += 128;
+ }
+ }
if (bdrv_pwrite_sync(extent->file,
- ((int64_t)m_data->l2_offset * 512)
- + (m_data->l2_index * sizeof(offset)),
- &offset, sizeof(offset)) < 0) {
+ ((int64_t)m_data->l2_offset * 512)
+ + ((m_data->l2_index) * sizeof(offset)),
+ l2_table_array, l2_array_size) < 0) {
return VMDK_ERROR;
}
/* update backup L2 table */
if (extent->l1_backup_table_offset != 0) {
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
if (bdrv_pwrite_sync(extent->file,
- ((int64_t)m_data->l2_offset * 512)
- + (m_data->l2_index * sizeof(offset)),
- &offset, sizeof(offset)) < 0) {
+ ((int64_t)m_data->l2_offset * 512)
+ + ((m_data->l2_index) * sizeof(offset)),
+ l2_table_array, l2_array_size) < 0) {
return VMDK_ERROR;
}
}
+
+ offset = temp_offset;
if (m_data->l2_cache_entry) {
- *m_data->l2_cache_entry = offset;
+ for (i = 0; i < m_data->nb_clusters; i++) {
+ *m_data->l2_cache_entry = cpu_to_le32(offset);
+ m_data->l2_cache_entry++;
+
+ if (!zeroed) {
+ offset += 128;
+ }
+ }
}
+ qemu_vfree(l2_table_array);
return VMDK_OK;
}
+static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
+ bool zeroed)
+{
+ int ret;
+
+ while (m_data->next != NULL) {
+
+ ret = vmdk_alloc_cluster_link_l2(extent, m_data, zeroed);
+ if (ret < 0) {
+ return ret;
+ }
+
+ m_data = m_data->next;
+ }
+
+ return VMDK_OK;
+}
+
/*
* vmdk_l2load
*
@@ -1261,9 +1316,10 @@ static int get_cluster_table(VmdkExtent *extent, uint64_t offset,
*
* 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,
+ int64_t *bytes, VmdkMetaData **m_data,
bool allocate, uint32_t *alloc_clusters_counter)
{
int l1_index, l2_offset, l2_index;
@@ -1272,6 +1328,7 @@ static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
uint32_t nb_clusters;
bool zeroed = false;
uint64_t skip_start_bytes, skip_end_bytes;
+ VmdkMetaData *old_m_data;
int ret;
ret = get_cluster_table(extent, offset, &l1_index, &l2_offset,
@@ -1323,13 +1380,21 @@ static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
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;
+
+ if (*m_data) {
+ old_m_data = *m_data;
+ *m_data = g_malloc0(sizeof(**m_data));
+
+ **m_data = (VmdkMetaData) {
+ .valid = 1,
+ .l1_index = l1_index,
+ .l2_index = l2_index,
+ .l2_offset = l2_offset,
+ .l2_cache_entry = &l2_table[l2_index],
+ .nb_clusters = nb_clusters,
+ .offset = cluster_sector,
+ .next = old_m_data,
+ };
}
}
*cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
@@ -1358,7 +1423,7 @@ static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
*/
static int vmdk_alloc_clusters(BlockDriverState *bs,
VmdkExtent *extent,
- VmdkMetaData *m_data, uint64_t offset,
+ VmdkMetaData **m_data, uint64_t offset,
bool allocate, uint64_t *cluster_offset,
int64_t bytes,
uint32_t *total_alloc_clusters)
@@ -1378,8 +1443,8 @@ static int vmdk_alloc_clusters(BlockDriverState *bs,
new_cluster_offset = 0;
*cluster_offset = 0;
n_bytes = 0;
- if (m_data) {
- m_data->valid = 0;
+ if (*m_data) {
+ (*m_data)->valid = 0;
}
/* due to L2 table margins all bytes may not get allocated at once */
@@ -1792,10 +1857,12 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
int64_t offset_in_cluster, n_bytes;
uint64_t cluster_offset;
uint64_t bytes_done = 0;
- VmdkMetaData m_data;
uint64_t extent_end;
+ VmdkMetaData *m_data;
uint32_t total_alloc_clusters = 0;
+ m_data = g_malloc0(sizeof(*m_data));
+
if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
error_report("Wrong offset: offset=0x%" PRIx64
" total_sectors=0x%" PRIx64,
@@ -1804,6 +1871,7 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
}
while (bytes > 0) {
+ m_data->next = NULL;
extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent);
if (!extent) {
return -EIO;
@@ -1849,7 +1917,7 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
total_alloc_clusters;
if (!zero_dry_run) {
/* update L2 tables */
- if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED)
+ if (vmdk_L2update(extent, m_data, zeroed)
!= VMDK_OK) {
return -EIO;
}
@@ -1863,11 +1931,9 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
if (ret) {
return ret;
}
- if (m_data.valid) {
+ if (m_data->valid) {
/* update L2 tables */
- if (vmdk_L2update(extent, &m_data,
- cluster_offset >> BDRV_SECTOR_BITS)
- != VMDK_OK) {
+ if (vmdk_L2update(extent, m_data, zeroed) != VMDK_OK) {
return -EIO;
}
}
@@ -1876,6 +1942,13 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
offset += n_bytes;
bytes_done += n_bytes;
+ while (m_data->next != NULL) {
+ VmdkMetaData *next;
+ next = m_data->next;
+ g_free(m_data);
+ m_data = next;
+ }
+
/* update CID on the first write every time the virtual disk is
* opened */
if (!s->cid_updated) {
@@ -1886,6 +1959,7 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
s->cid_updated = true;
}
}
+ g_free(m_data);
return 0;
}
--
2.6.2
On Mon, 06/05 13:22, Ashijeet Acharya wrote:
> @@ -1876,6 +1942,13 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
> offset += n_bytes;
> bytes_done += n_bytes;
>
> + while (m_data->next != NULL) {
If you do
while (m_data) {
> + VmdkMetaData *next;
> + next = m_data->next;
> + g_free(m_data);
> + m_data = next;
> + }
> +
> /* update CID on the first write every time the virtual disk is
> * opened */
> if (!s->cid_updated) {
> @@ -1886,6 +1959,7 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
> s->cid_updated = true;
> }
> }
> + g_free(m_data);
then you can remove this line.
> return 0;
> }
>
> --
> 2.6.2
>
On Tue, Jun 27, 2017 at 1:34 PM, Fam Zheng <famz@redhat.com> wrote:
> On Mon, 06/05 13:22, Ashijeet Acharya wrote:
>> @@ -1876,6 +1942,13 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
>> offset += n_bytes;
>> bytes_done += n_bytes;
>>
>> + while (m_data->next != NULL) {
>
> If you do
>
> while (m_data) {
>
>> + VmdkMetaData *next;
>> + next = m_data->next;
>> + g_free(m_data);
>> + m_data = next;
>> + }
>> +
>> /* update CID on the first write every time the virtual disk is
>> * opened */
>> if (!s->cid_updated) {
>> @@ -1886,6 +1959,7 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
>> s->cid_updated = true;
>> }
>> }
>> + g_free(m_data);
>
> then you can remove this line.
As I explained last time, I can't do this because I am reusing the
first allocated m_data. If I am to do it the way you suggest, I will
have to move the allocation of first m_data (m_data =
g_new0(VmdkMetaData, 1)) inside the outer while loop, otherwise things
will segfault.
Ashijeet
On Mon, 06/05 13:22, Ashijeet Acharya wrote:
> Include a next pointer in VmdkMetaData struct to point to the previous
> allocated L2 table. Modify vmdk_L2update to start updating metadata for
> allocation of multiple clusters at once.
>
> Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
> ---
> block/vmdk.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++-------------
> 1 file changed, 101 insertions(+), 27 deletions(-)
>
> diff --git a/block/vmdk.c b/block/vmdk.c
> index b671dc9..9fa2414 100644
> --- a/block/vmdk.c
> +++ b/block/vmdk.c
> @@ -137,6 +137,8 @@ typedef struct VmdkMetaData {
> int valid;
> uint32_t *l2_cache_entry;
> uint32_t nb_clusters;
> + uint32_t offset;
> + struct VmdkMetaData *next;
> } VmdkMetaData;
>
> typedef struct VmdkGrainMarker {
> @@ -1116,34 +1118,87 @@ exit:
> return ret;
> }
>
> -static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
> - uint32_t offset)
> +static int vmdk_alloc_cluster_link_l2(VmdkExtent *extent,
> + VmdkMetaData *m_data, bool zeroed)
> {
> - offset = cpu_to_le32(offset);
> + int i;
> + uint32_t offset, temp_offset;
> + int *l2_table_array;
> + int l2_array_size;
> +
> + if (zeroed) {
> + temp_offset = VMDK_GTE_ZEROED;
> + } else {
> + temp_offset = m_data->offset;
> + }
> +
> + l2_array_size = sizeof(uint32_t) * m_data->nb_clusters;
> + l2_table_array = qemu_try_blockalign(extent->file->bs,
> + QEMU_ALIGN_UP(l2_array_size,
> + BDRV_SECTOR_SIZE));
> + if (l2_table_array == NULL) {
> + return VMDK_ERROR;
> + }
> + memset(l2_table_array, 0, QEMU_ALIGN_UP(l2_array_size, BDRV_SECTOR_SIZE));
> /* update L2 table */
> + offset = temp_offset;
> + for (i = 0; i < m_data->nb_clusters; i++) {
> + l2_table_array[i] = cpu_to_le32(offset);
> + if (!zeroed) {
> + offset += 128;
s/128/extent->cluster_sectors/?
> + }
> + }
> if (bdrv_pwrite_sync(extent->file,
> - ((int64_t)m_data->l2_offset * 512)
> - + (m_data->l2_index * sizeof(offset)),
> - &offset, sizeof(offset)) < 0) {
> + ((int64_t)m_data->l2_offset * 512)
> + + ((m_data->l2_index) * sizeof(offset)),
> + l2_table_array, l2_array_size) < 0) {
> return VMDK_ERROR;
> }
> /* update backup L2 table */
> if (extent->l1_backup_table_offset != 0) {
> m_data->l2_offset = extent->l1_backup_table[m_data->l1_index];
> if (bdrv_pwrite_sync(extent->file,
> - ((int64_t)m_data->l2_offset * 512)
> - + (m_data->l2_index * sizeof(offset)),
> - &offset, sizeof(offset)) < 0) {
> + ((int64_t)m_data->l2_offset * 512)
> + + ((m_data->l2_index) * sizeof(offset)),
> + l2_table_array, l2_array_size) < 0) {
> return VMDK_ERROR;
> }
> }
> +
> + offset = temp_offset;
> if (m_data->l2_cache_entry) {
> - *m_data->l2_cache_entry = offset;
> + for (i = 0; i < m_data->nb_clusters; i++) {
> + *m_data->l2_cache_entry = cpu_to_le32(offset);
> + m_data->l2_cache_entry++;
> +
> + if (!zeroed) {
> + offset += 128;
Ditto.
> + }
> + }
> }
>
> + qemu_vfree(l2_table_array);
> return VMDK_OK;
> }
>
> +static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data,
> + bool zeroed)
> +{
> + int ret;
> +
> + while (m_data->next != NULL) {
> +
> + ret = vmdk_alloc_cluster_link_l2(extent, m_data, zeroed);
> + if (ret < 0) {
> + return ret;
> + }
> +
> + m_data = m_data->next;
> + }
> +
> + return VMDK_OK;
> +}
> +
> /*
> * vmdk_l2load
> *
> @@ -1261,9 +1316,10 @@ static int get_cluster_table(VmdkExtent *extent, uint64_t offset,
> *
> * 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,
> + int64_t *bytes, VmdkMetaData **m_data,
> bool allocate, uint32_t *alloc_clusters_counter)
> {
> int l1_index, l2_offset, l2_index;
> @@ -1272,6 +1328,7 @@ static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
> uint32_t nb_clusters;
> bool zeroed = false;
> uint64_t skip_start_bytes, skip_end_bytes;
> + VmdkMetaData *old_m_data;
> int ret;
>
> ret = get_cluster_table(extent, offset, &l1_index, &l2_offset,
> @@ -1323,13 +1380,21 @@ static int vmdk_handle_alloc(BlockDriverState *bs, VmdkExtent *extent,
> 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;
> +
> + if (*m_data) {
Please check m_data != NULL if it's possible, otherwise assert it.
> + old_m_data = *m_data;
> + *m_data = g_malloc0(sizeof(**m_data));
> +
> + **m_data = (VmdkMetaData) {
> + .valid = 1,
> + .l1_index = l1_index,
> + .l2_index = l2_index,
> + .l2_offset = l2_offset,
> + .l2_cache_entry = &l2_table[l2_index],
> + .nb_clusters = nb_clusters,
> + .offset = cluster_sector,
> + .next = old_m_data,
> + };
> }
> }
> *cluster_offset = cluster_sector << BDRV_SECTOR_BITS;
> @@ -1792,10 +1857,12 @@ static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset,
> int64_t offset_in_cluster, n_bytes;
> uint64_t cluster_offset;
> uint64_t bytes_done = 0;
> - VmdkMetaData m_data;
> uint64_t extent_end;
> + VmdkMetaData *m_data;
> uint32_t total_alloc_clusters = 0;
>
> + m_data = g_malloc0(sizeof(*m_data));
You can use "g_new0(VmdkMetaData, 1)" which is more readable.
> +
> if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) {
> error_report("Wrong offset: offset=0x%" PRIx64
> " total_sectors=0x%" PRIx64,
Fam
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