[v6,7/8] vmdk: Update metadata for multiple clusters

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(-)

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 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

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