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Re: [Qemu-devel] [PATCH v6 7/8] vmdk: Update metadata for multiple clust
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH v6 7/8] vmdk: Update metadata for multiple clusters |
Date: |
Tue, 27 Jun 2017 16:14:00 +0800 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
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 <address@hidden>
> ---
> 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
- [Qemu-devel] [PATCH v6 2/8] vmdk: Rename get_whole_cluster() to vmdk_perform_cow(), (continued)
- [Qemu-devel] [PATCH v6 2/8] vmdk: Rename get_whole_cluster() to vmdk_perform_cow(), Ashijeet Acharya, 2017/06/05
- [Qemu-devel] [PATCH v6 3/8] vmdk: Rename get_cluster_offset() to vmdk_get_cluster_offset(), Ashijeet Acharya, 2017/06/05
- [Qemu-devel] [PATCH v6 4/8] vmdk: Factor out metadata loading code out of vmdk_get_cluster_offset(), Ashijeet Acharya, 2017/06/05
- [Qemu-devel] [PATCH v6 5/8] vmdk: Set maximum bytes allocated in one cycle, Ashijeet Acharya, 2017/06/05
- [Qemu-devel] [PATCH v6 6/8] vmdk: New functions to assist allocating multiple clusters, Ashijeet Acharya, 2017/06/05
- [Qemu-devel] [PATCH v6 7/8] vmdk: Update metadata for multiple clusters, Ashijeet Acharya, 2017/06/05
- [Qemu-devel] [PATCH v6 8/8] vmdk: Make vmdk_get_cluster_offset() return cluster offset only, Ashijeet Acharya, 2017/06/05