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kvm tools: Avoid byte-order conversion during each read operation

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Signed-off-by: Prasad Joshi <prasadjoshi124@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Prasad Joshi
2015-06-01 16:39:42 +01:00
committed by Will Deacon
parent c5e0624bce
commit 00adcc1b3c
1 changed files with 12 additions and 5 deletions
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qcow.c
+12 -5
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@@ -58,7 +58,7 @@ static int qcow1_read_sector(struct disk_image *self, uint64_t sector, void *dst
if (l1_idx >= q->table.table_size)
goto out_error;
l2_table_offset = be64_to_cpu(q->table.l1_table[l1_idx]);
l2_table_offset = q->table.l1_table[l1_idx];
if (!l2_table_offset)
goto zero_sector;
@@ -128,16 +128,23 @@ struct disk_image_operations qcow1_disk_ops = {
static int qcow_read_l1_table(struct qcow *q)
{
struct qcow1_header *header = q->header;
struct qcow_table *table = &q->table;
u64 i;
q->table.table_size = header->size / ((1 << header->l2_bits) * (1 << header->cluster_bits));
table->table_size = header->size / ((1 << header->l2_bits) *
(1 << header->cluster_bits));
q->table.l1_table = calloc(q->table.table_size, sizeof(uint64_t));
if (!q->table.l1_table)
table->l1_table = calloc(table->table_size, sizeof(u64));
if (!table->l1_table)
return -1;
if (pread_in_full(q->fd, q->table.l1_table, sizeof(uint64_t) * q->table.table_size, header->l1_table_offset) < 0)
if (pread_in_full(q->fd, table->l1_table, sizeof(u64) *
table->table_size, header->l1_table_offset) < 0)
return -1;
for (i = 0; i < table->table_size; i++)
be64_to_cpus(&table->l1_table[i]);
return 0;
}